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 IS_ENABLED(CONFIG_IPV6_MIP6) 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 #define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */ 67 68 static struct raw_hashinfo raw_v6_hashinfo = { 69 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock), 70 }; 71 72 static struct sock *__raw_v6_lookup(struct net *net, struct sock *sk, 73 unsigned short num, const struct in6_addr *loc_addr, 74 const struct in6_addr *rmt_addr, int dif) 75 { 76 bool is_multicast = ipv6_addr_is_multicast(loc_addr); 77 78 sk_for_each_from(sk) 79 if (inet_sk(sk)->inet_num == num) { 80 struct ipv6_pinfo *np = inet6_sk(sk); 81 82 if (!net_eq(sock_net(sk), net)) 83 continue; 84 85 if (!ipv6_addr_any(&np->daddr) && 86 !ipv6_addr_equal(&np->daddr, rmt_addr)) 87 continue; 88 89 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 90 continue; 91 92 if (!ipv6_addr_any(&np->rcv_saddr)) { 93 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 94 goto found; 95 if (is_multicast && 96 inet6_mc_check(sk, loc_addr, rmt_addr)) 97 goto found; 98 continue; 99 } 100 goto found; 101 } 102 sk = NULL; 103 found: 104 return sk; 105 } 106 107 /* 108 * 0 - deliver 109 * 1 - block 110 */ 111 static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb) 112 { 113 struct icmp6hdr _hdr; 114 const struct icmp6hdr *hdr; 115 116 /* We require only the four bytes of the ICMPv6 header, not any 117 * additional bytes of message body in "struct icmp6hdr". 118 */ 119 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 120 ICMPV6_HDRLEN, &_hdr); 121 if (hdr) { 122 const __u32 *data = &raw6_sk(sk)->filter.data[0]; 123 unsigned int type = hdr->icmp6_type; 124 125 return (data[type >> 5] & (1U << (type & 31))) != 0; 126 } 127 return 1; 128 } 129 130 #if IS_ENABLED(CONFIG_IPV6_MIP6) 131 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb); 132 133 static mh_filter_t __rcu *mh_filter __read_mostly; 134 135 int rawv6_mh_filter_register(mh_filter_t filter) 136 { 137 rcu_assign_pointer(mh_filter, filter); 138 return 0; 139 } 140 EXPORT_SYMBOL(rawv6_mh_filter_register); 141 142 int rawv6_mh_filter_unregister(mh_filter_t filter) 143 { 144 RCU_INIT_POINTER(mh_filter, NULL); 145 synchronize_rcu(); 146 return 0; 147 } 148 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 149 150 #endif 151 152 /* 153 * demultiplex raw sockets. 154 * (should consider queueing the skb in the sock receive_queue 155 * without calling rawv6.c) 156 * 157 * Caller owns SKB so we must make clones. 158 */ 159 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 160 { 161 const struct in6_addr *saddr; 162 const struct in6_addr *daddr; 163 struct sock *sk; 164 bool delivered = false; 165 __u8 hash; 166 struct net *net; 167 168 saddr = &ipv6_hdr(skb)->saddr; 169 daddr = saddr + 1; 170 171 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 172 173 read_lock(&raw_v6_hashinfo.lock); 174 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 175 176 if (sk == NULL) 177 goto out; 178 179 net = dev_net(skb->dev); 180 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif); 181 182 while (sk) { 183 int filtered; 184 185 delivered = true; 186 switch (nexthdr) { 187 case IPPROTO_ICMPV6: 188 filtered = icmpv6_filter(sk, skb); 189 break; 190 191 #if IS_ENABLED(CONFIG_IPV6_MIP6) 192 case IPPROTO_MH: 193 { 194 /* XXX: To validate MH only once for each packet, 195 * this is placed here. It should be after checking 196 * xfrm policy, however it doesn't. The checking xfrm 197 * policy is placed in rawv6_rcv() because it is 198 * required for each socket. 199 */ 200 mh_filter_t *filter; 201 202 filter = rcu_dereference(mh_filter); 203 filtered = filter ? (*filter)(sk, skb) : 0; 204 break; 205 } 206 #endif 207 default: 208 filtered = 0; 209 break; 210 } 211 212 if (filtered < 0) 213 break; 214 if (filtered == 0) { 215 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 216 217 /* Not releasing hash table! */ 218 if (clone) { 219 nf_reset(clone); 220 rawv6_rcv(sk, clone); 221 } 222 } 223 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr, 224 IP6CB(skb)->iif); 225 } 226 out: 227 read_unlock(&raw_v6_hashinfo.lock); 228 return delivered; 229 } 230 231 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr) 232 { 233 struct sock *raw_sk; 234 235 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]); 236 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr)) 237 raw_sk = NULL; 238 239 return raw_sk != NULL; 240 } 241 242 /* This cleans up af_inet6 a bit. -DaveM */ 243 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 244 { 245 struct inet_sock *inet = inet_sk(sk); 246 struct ipv6_pinfo *np = inet6_sk(sk); 247 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 248 __be32 v4addr = 0; 249 int addr_type; 250 int err; 251 252 if (addr_len < SIN6_LEN_RFC2133) 253 return -EINVAL; 254 addr_type = ipv6_addr_type(&addr->sin6_addr); 255 256 /* Raw sockets are IPv6 only */ 257 if (addr_type == IPV6_ADDR_MAPPED) 258 return -EADDRNOTAVAIL; 259 260 lock_sock(sk); 261 262 err = -EINVAL; 263 if (sk->sk_state != TCP_CLOSE) 264 goto out; 265 266 rcu_read_lock(); 267 /* Check if the address belongs to the host. */ 268 if (addr_type != IPV6_ADDR_ANY) { 269 struct net_device *dev = NULL; 270 271 if (__ipv6_addr_needs_scope_id(addr_type)) { 272 if (addr_len >= sizeof(struct sockaddr_in6) && 273 addr->sin6_scope_id) { 274 /* Override any existing binding, if another 275 * one is supplied by user. 276 */ 277 sk->sk_bound_dev_if = addr->sin6_scope_id; 278 } 279 280 /* Binding to link-local address requires an interface */ 281 if (!sk->sk_bound_dev_if) 282 goto out_unlock; 283 284 err = -ENODEV; 285 dev = dev_get_by_index_rcu(sock_net(sk), 286 sk->sk_bound_dev_if); 287 if (!dev) 288 goto out_unlock; 289 } 290 291 /* ipv4 addr of the socket is invalid. Only the 292 * unspecified and mapped address have a v4 equivalent. 293 */ 294 v4addr = LOOPBACK4_IPV6; 295 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 296 err = -EADDRNOTAVAIL; 297 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 298 dev, 0)) { 299 goto out_unlock; 300 } 301 } 302 } 303 304 inet->inet_rcv_saddr = inet->inet_saddr = v4addr; 305 np->rcv_saddr = addr->sin6_addr; 306 if (!(addr_type & IPV6_ADDR_MULTICAST)) 307 np->saddr = addr->sin6_addr; 308 err = 0; 309 out_unlock: 310 rcu_read_unlock(); 311 out: 312 release_sock(sk); 313 return err; 314 } 315 316 static void rawv6_err(struct sock *sk, struct sk_buff *skb, 317 struct inet6_skb_parm *opt, 318 u8 type, u8 code, int offset, __be32 info) 319 { 320 struct inet_sock *inet = inet_sk(sk); 321 struct ipv6_pinfo *np = inet6_sk(sk); 322 int err; 323 int harderr; 324 325 /* Report error on raw socket, if: 326 1. User requested recverr. 327 2. Socket is connected (otherwise the error indication 328 is useless without recverr and error is hard. 329 */ 330 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 331 return; 332 333 harderr = icmpv6_err_convert(type, code, &err); 334 if (type == ICMPV6_PKT_TOOBIG) { 335 ip6_sk_update_pmtu(skb, sk, info); 336 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 337 } 338 if (type == NDISC_REDIRECT) { 339 ip6_sk_redirect(skb, sk); 340 return; 341 } 342 if (np->recverr) { 343 u8 *payload = skb->data; 344 if (!inet->hdrincl) 345 payload += offset; 346 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 347 } 348 349 if (np->recverr || harderr) { 350 sk->sk_err = err; 351 sk->sk_error_report(sk); 352 } 353 } 354 355 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 356 u8 type, u8 code, int inner_offset, __be32 info) 357 { 358 struct sock *sk; 359 int hash; 360 const struct in6_addr *saddr, *daddr; 361 struct net *net; 362 363 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 364 365 read_lock(&raw_v6_hashinfo.lock); 366 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 367 if (sk != NULL) { 368 /* Note: ipv6_hdr(skb) != skb->data */ 369 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data; 370 saddr = &ip6h->saddr; 371 daddr = &ip6h->daddr; 372 net = dev_net(skb->dev); 373 374 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, 375 IP6CB(skb)->iif))) { 376 rawv6_err(sk, skb, NULL, type, code, 377 inner_offset, info); 378 sk = sk_next(sk); 379 } 380 } 381 read_unlock(&raw_v6_hashinfo.lock); 382 } 383 384 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb) 385 { 386 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) && 387 skb_checksum_complete(skb)) { 388 atomic_inc(&sk->sk_drops); 389 kfree_skb(skb); 390 return NET_RX_DROP; 391 } 392 393 /* Charge it to the socket. */ 394 skb_dst_drop(skb); 395 if (sock_queue_rcv_skb(sk, skb) < 0) { 396 kfree_skb(skb); 397 return NET_RX_DROP; 398 } 399 400 return 0; 401 } 402 403 /* 404 * This is next to useless... 405 * if we demultiplex in network layer we don't need the extra call 406 * just to queue the skb... 407 * maybe we could have the network decide upon a hint if it 408 * should call raw_rcv for demultiplexing 409 */ 410 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 411 { 412 struct inet_sock *inet = inet_sk(sk); 413 struct raw6_sock *rp = raw6_sk(sk); 414 415 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 416 atomic_inc(&sk->sk_drops); 417 kfree_skb(skb); 418 return NET_RX_DROP; 419 } 420 421 if (!rp->checksum) 422 skb->ip_summed = CHECKSUM_UNNECESSARY; 423 424 if (skb->ip_summed == CHECKSUM_COMPLETE) { 425 skb_postpull_rcsum(skb, skb_network_header(skb), 426 skb_network_header_len(skb)); 427 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 428 &ipv6_hdr(skb)->daddr, 429 skb->len, inet->inet_num, skb->csum)) 430 skb->ip_summed = CHECKSUM_UNNECESSARY; 431 } 432 if (!skb_csum_unnecessary(skb)) 433 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 434 &ipv6_hdr(skb)->daddr, 435 skb->len, 436 inet->inet_num, 0)); 437 438 if (inet->hdrincl) { 439 if (skb_checksum_complete(skb)) { 440 atomic_inc(&sk->sk_drops); 441 kfree_skb(skb); 442 return NET_RX_DROP; 443 } 444 } 445 446 rawv6_rcv_skb(sk, skb); 447 return 0; 448 } 449 450 451 /* 452 * This should be easy, if there is something there 453 * we return it, otherwise we block. 454 */ 455 456 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 457 struct msghdr *msg, size_t len, 458 int noblock, int flags, int *addr_len) 459 { 460 struct ipv6_pinfo *np = inet6_sk(sk); 461 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 462 struct sk_buff *skb; 463 size_t copied; 464 int err; 465 466 if (flags & MSG_OOB) 467 return -EOPNOTSUPP; 468 469 if (addr_len) 470 *addr_len=sizeof(*sin6); 471 472 if (flags & MSG_ERRQUEUE) 473 return ipv6_recv_error(sk, msg, len); 474 475 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 476 return ipv6_recv_rxpmtu(sk, msg, len); 477 478 skb = skb_recv_datagram(sk, flags, noblock, &err); 479 if (!skb) 480 goto out; 481 482 copied = skb->len; 483 if (copied > len) { 484 copied = len; 485 msg->msg_flags |= MSG_TRUNC; 486 } 487 488 if (skb_csum_unnecessary(skb)) { 489 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 490 } else if (msg->msg_flags&MSG_TRUNC) { 491 if (__skb_checksum_complete(skb)) 492 goto csum_copy_err; 493 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 494 } else { 495 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 496 if (err == -EINVAL) 497 goto csum_copy_err; 498 } 499 if (err) 500 goto out_free; 501 502 /* Copy the address. */ 503 if (sin6) { 504 sin6->sin6_family = AF_INET6; 505 sin6->sin6_port = 0; 506 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 507 sin6->sin6_flowinfo = 0; 508 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, 509 IP6CB(skb)->iif); 510 } 511 512 sock_recv_ts_and_drops(msg, sk, skb); 513 514 if (np->rxopt.all) 515 ip6_datagram_recv_ctl(sk, msg, skb); 516 517 err = copied; 518 if (flags & MSG_TRUNC) 519 err = skb->len; 520 521 out_free: 522 skb_free_datagram(sk, skb); 523 out: 524 return err; 525 526 csum_copy_err: 527 skb_kill_datagram(sk, skb, flags); 528 529 /* Error for blocking case is chosen to masquerade 530 as some normal condition. 531 */ 532 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 533 goto out; 534 } 535 536 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 537 struct raw6_sock *rp) 538 { 539 struct sk_buff *skb; 540 int err = 0; 541 int offset; 542 int len; 543 int total_len; 544 __wsum tmp_csum; 545 __sum16 csum; 546 547 if (!rp->checksum) 548 goto send; 549 550 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 551 goto out; 552 553 offset = rp->offset; 554 total_len = inet_sk(sk)->cork.base.length; 555 if (offset >= total_len - 1) { 556 err = -EINVAL; 557 ip6_flush_pending_frames(sk); 558 goto out; 559 } 560 561 /* should be check HW csum miyazawa */ 562 if (skb_queue_len(&sk->sk_write_queue) == 1) { 563 /* 564 * Only one fragment on the socket. 565 */ 566 tmp_csum = skb->csum; 567 } else { 568 struct sk_buff *csum_skb = NULL; 569 tmp_csum = 0; 570 571 skb_queue_walk(&sk->sk_write_queue, skb) { 572 tmp_csum = csum_add(tmp_csum, skb->csum); 573 574 if (csum_skb) 575 continue; 576 577 len = skb->len - skb_transport_offset(skb); 578 if (offset >= len) { 579 offset -= len; 580 continue; 581 } 582 583 csum_skb = skb; 584 } 585 586 skb = csum_skb; 587 } 588 589 offset += skb_transport_offset(skb); 590 if (skb_copy_bits(skb, offset, &csum, 2)) 591 BUG(); 592 593 /* in case cksum was not initialized */ 594 if (unlikely(csum)) 595 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 596 597 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 598 total_len, fl6->flowi6_proto, tmp_csum); 599 600 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP) 601 csum = CSUM_MANGLED_0; 602 603 if (skb_store_bits(skb, offset, &csum, 2)) 604 BUG(); 605 606 send: 607 err = ip6_push_pending_frames(sk); 608 out: 609 return err; 610 } 611 612 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 613 struct flowi6 *fl6, struct dst_entry **dstp, 614 unsigned int flags) 615 { 616 struct ipv6_pinfo *np = inet6_sk(sk); 617 struct ipv6hdr *iph; 618 struct sk_buff *skb; 619 int err; 620 struct rt6_info *rt = (struct rt6_info *)*dstp; 621 int hlen = LL_RESERVED_SPACE(rt->dst.dev); 622 int tlen = rt->dst.dev->needed_tailroom; 623 624 if (length > rt->dst.dev->mtu) { 625 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu); 626 return -EMSGSIZE; 627 } 628 if (flags&MSG_PROBE) 629 goto out; 630 631 skb = sock_alloc_send_skb(sk, 632 length + hlen + tlen + 15, 633 flags & MSG_DONTWAIT, &err); 634 if (skb == NULL) 635 goto error; 636 skb_reserve(skb, hlen); 637 638 skb->protocol = htons(ETH_P_IPV6); 639 skb->priority = sk->sk_priority; 640 skb->mark = sk->sk_mark; 641 skb_dst_set(skb, &rt->dst); 642 *dstp = NULL; 643 644 skb_put(skb, length); 645 skb_reset_network_header(skb); 646 iph = ipv6_hdr(skb); 647 648 skb->ip_summed = CHECKSUM_NONE; 649 650 skb->transport_header = skb->network_header; 651 err = memcpy_fromiovecend((void *)iph, from, 0, length); 652 if (err) 653 goto error_fault; 654 655 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); 656 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, 657 rt->dst.dev, dst_output); 658 if (err > 0) 659 err = net_xmit_errno(err); 660 if (err) 661 goto error; 662 out: 663 return 0; 664 665 error_fault: 666 err = -EFAULT; 667 kfree_skb(skb); 668 error: 669 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 670 if (err == -ENOBUFS && !np->recverr) 671 err = 0; 672 return err; 673 } 674 675 static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg) 676 { 677 struct iovec *iov; 678 u8 __user *type = NULL; 679 u8 __user *code = NULL; 680 u8 len = 0; 681 int probed = 0; 682 int i; 683 684 if (!msg->msg_iov) 685 return 0; 686 687 for (i = 0; i < msg->msg_iovlen; i++) { 688 iov = &msg->msg_iov[i]; 689 if (!iov) 690 continue; 691 692 switch (fl6->flowi6_proto) { 693 case IPPROTO_ICMPV6: 694 /* check if one-byte field is readable or not. */ 695 if (iov->iov_base && iov->iov_len < 1) 696 break; 697 698 if (!type) { 699 type = iov->iov_base; 700 /* check if code field is readable or not. */ 701 if (iov->iov_len > 1) 702 code = type + 1; 703 } else if (!code) 704 code = iov->iov_base; 705 706 if (type && code) { 707 if (get_user(fl6->fl6_icmp_type, type) || 708 get_user(fl6->fl6_icmp_code, code)) 709 return -EFAULT; 710 probed = 1; 711 } 712 break; 713 case IPPROTO_MH: 714 if (iov->iov_base && iov->iov_len < 1) 715 break; 716 /* check if type field is readable or not. */ 717 if (iov->iov_len > 2 - len) { 718 u8 __user *p = iov->iov_base; 719 if (get_user(fl6->fl6_mh_type, &p[2 - len])) 720 return -EFAULT; 721 probed = 1; 722 } else 723 len += iov->iov_len; 724 725 break; 726 default: 727 probed = 1; 728 break; 729 } 730 if (probed) 731 break; 732 } 733 return 0; 734 } 735 736 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 737 struct msghdr *msg, size_t len) 738 { 739 struct ipv6_txoptions opt_space; 740 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 741 struct in6_addr *daddr, *final_p, final; 742 struct inet_sock *inet = inet_sk(sk); 743 struct ipv6_pinfo *np = inet6_sk(sk); 744 struct raw6_sock *rp = raw6_sk(sk); 745 struct ipv6_txoptions *opt = NULL; 746 struct ip6_flowlabel *flowlabel = NULL; 747 struct dst_entry *dst = NULL; 748 struct flowi6 fl6; 749 int addr_len = msg->msg_namelen; 750 int hlimit = -1; 751 int tclass = -1; 752 int dontfrag = -1; 753 u16 proto; 754 int err; 755 756 /* Rough check on arithmetic overflow, 757 better check is made in ip6_append_data(). 758 */ 759 if (len > INT_MAX) 760 return -EMSGSIZE; 761 762 /* Mirror BSD error message compatibility */ 763 if (msg->msg_flags & MSG_OOB) 764 return -EOPNOTSUPP; 765 766 /* 767 * Get and verify the address. 768 */ 769 memset(&fl6, 0, sizeof(fl6)); 770 771 fl6.flowi6_mark = sk->sk_mark; 772 773 if (sin6) { 774 if (addr_len < SIN6_LEN_RFC2133) 775 return -EINVAL; 776 777 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 778 return -EAFNOSUPPORT; 779 780 /* port is the proto value [0..255] carried in nexthdr */ 781 proto = ntohs(sin6->sin6_port); 782 783 if (!proto) 784 proto = inet->inet_num; 785 else if (proto != inet->inet_num) 786 return -EINVAL; 787 788 if (proto > 255) 789 return -EINVAL; 790 791 daddr = &sin6->sin6_addr; 792 if (np->sndflow) { 793 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 794 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 795 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 796 if (flowlabel == NULL) 797 return -EINVAL; 798 daddr = &flowlabel->dst; 799 } 800 } 801 802 /* 803 * Otherwise it will be difficult to maintain 804 * sk->sk_dst_cache. 805 */ 806 if (sk->sk_state == TCP_ESTABLISHED && 807 ipv6_addr_equal(daddr, &np->daddr)) 808 daddr = &np->daddr; 809 810 if (addr_len >= sizeof(struct sockaddr_in6) && 811 sin6->sin6_scope_id && 812 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 813 fl6.flowi6_oif = sin6->sin6_scope_id; 814 } else { 815 if (sk->sk_state != TCP_ESTABLISHED) 816 return -EDESTADDRREQ; 817 818 proto = inet->inet_num; 819 daddr = &np->daddr; 820 fl6.flowlabel = np->flow_label; 821 } 822 823 if (fl6.flowi6_oif == 0) 824 fl6.flowi6_oif = sk->sk_bound_dev_if; 825 826 if (msg->msg_controllen) { 827 opt = &opt_space; 828 memset(opt, 0, sizeof(struct ipv6_txoptions)); 829 opt->tot_len = sizeof(struct ipv6_txoptions); 830 831 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 832 &hlimit, &tclass, &dontfrag); 833 if (err < 0) { 834 fl6_sock_release(flowlabel); 835 return err; 836 } 837 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 838 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 839 if (flowlabel == NULL) 840 return -EINVAL; 841 } 842 if (!(opt->opt_nflen|opt->opt_flen)) 843 opt = NULL; 844 } 845 if (opt == NULL) 846 opt = np->opt; 847 if (flowlabel) 848 opt = fl6_merge_options(&opt_space, flowlabel, opt); 849 opt = ipv6_fixup_options(&opt_space, opt); 850 851 fl6.flowi6_proto = proto; 852 err = rawv6_probe_proto_opt(&fl6, msg); 853 if (err) 854 goto out; 855 856 if (!ipv6_addr_any(daddr)) 857 fl6.daddr = *daddr; 858 else 859 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 860 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 861 fl6.saddr = np->saddr; 862 863 final_p = fl6_update_dst(&fl6, opt, &final); 864 865 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 866 fl6.flowi6_oif = np->mcast_oif; 867 else if (!fl6.flowi6_oif) 868 fl6.flowi6_oif = np->ucast_oif; 869 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 870 871 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); 872 if (IS_ERR(dst)) { 873 err = PTR_ERR(dst); 874 goto out; 875 } 876 if (hlimit < 0) { 877 if (ipv6_addr_is_multicast(&fl6.daddr)) 878 hlimit = np->mcast_hops; 879 else 880 hlimit = np->hop_limit; 881 if (hlimit < 0) 882 hlimit = ip6_dst_hoplimit(dst); 883 } 884 885 if (tclass < 0) 886 tclass = np->tclass; 887 888 if (dontfrag < 0) 889 dontfrag = np->dontfrag; 890 891 if (msg->msg_flags&MSG_CONFIRM) 892 goto do_confirm; 893 894 back_from_confirm: 895 if (inet->hdrincl) 896 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags); 897 else { 898 lock_sock(sk); 899 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 900 len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst, 901 msg->msg_flags, dontfrag); 902 903 if (err) 904 ip6_flush_pending_frames(sk); 905 else if (!(msg->msg_flags & MSG_MORE)) 906 err = rawv6_push_pending_frames(sk, &fl6, rp); 907 release_sock(sk); 908 } 909 done: 910 dst_release(dst); 911 out: 912 fl6_sock_release(flowlabel); 913 return err<0?err:len; 914 do_confirm: 915 dst_confirm(dst); 916 if (!(msg->msg_flags & MSG_PROBE) || len) 917 goto back_from_confirm; 918 err = 0; 919 goto done; 920 } 921 922 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 923 char __user *optval, int optlen) 924 { 925 switch (optname) { 926 case ICMPV6_FILTER: 927 if (optlen > sizeof(struct icmp6_filter)) 928 optlen = sizeof(struct icmp6_filter); 929 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 930 return -EFAULT; 931 return 0; 932 default: 933 return -ENOPROTOOPT; 934 } 935 936 return 0; 937 } 938 939 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 940 char __user *optval, int __user *optlen) 941 { 942 int len; 943 944 switch (optname) { 945 case ICMPV6_FILTER: 946 if (get_user(len, optlen)) 947 return -EFAULT; 948 if (len < 0) 949 return -EINVAL; 950 if (len > sizeof(struct icmp6_filter)) 951 len = sizeof(struct icmp6_filter); 952 if (put_user(len, optlen)) 953 return -EFAULT; 954 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 955 return -EFAULT; 956 return 0; 957 default: 958 return -ENOPROTOOPT; 959 } 960 961 return 0; 962 } 963 964 965 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 966 char __user *optval, unsigned int optlen) 967 { 968 struct raw6_sock *rp = raw6_sk(sk); 969 int val; 970 971 if (get_user(val, (int __user *)optval)) 972 return -EFAULT; 973 974 switch (optname) { 975 case IPV6_CHECKSUM: 976 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 977 level == IPPROTO_IPV6) { 978 /* 979 * RFC3542 tells that IPV6_CHECKSUM socket 980 * option in the IPPROTO_IPV6 level is not 981 * allowed on ICMPv6 sockets. 982 * If you want to set it, use IPPROTO_RAW 983 * level IPV6_CHECKSUM socket option 984 * (Linux extension). 985 */ 986 return -EINVAL; 987 } 988 989 /* You may get strange result with a positive odd offset; 990 RFC2292bis agrees with me. */ 991 if (val > 0 && (val&1)) 992 return -EINVAL; 993 if (val < 0) { 994 rp->checksum = 0; 995 } else { 996 rp->checksum = 1; 997 rp->offset = val; 998 } 999 1000 return 0; 1001 1002 default: 1003 return -ENOPROTOOPT; 1004 } 1005 } 1006 1007 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1008 char __user *optval, unsigned int optlen) 1009 { 1010 switch (level) { 1011 case SOL_RAW: 1012 break; 1013 1014 case SOL_ICMPV6: 1015 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1016 return -EOPNOTSUPP; 1017 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1018 case SOL_IPV6: 1019 if (optname == IPV6_CHECKSUM) 1020 break; 1021 default: 1022 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1023 } 1024 1025 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1026 } 1027 1028 #ifdef CONFIG_COMPAT 1029 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1030 char __user *optval, unsigned int optlen) 1031 { 1032 switch (level) { 1033 case SOL_RAW: 1034 break; 1035 case SOL_ICMPV6: 1036 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1037 return -EOPNOTSUPP; 1038 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1039 case SOL_IPV6: 1040 if (optname == IPV6_CHECKSUM) 1041 break; 1042 default: 1043 return compat_ipv6_setsockopt(sk, level, optname, 1044 optval, optlen); 1045 } 1046 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1047 } 1048 #endif 1049 1050 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1051 char __user *optval, int __user *optlen) 1052 { 1053 struct raw6_sock *rp = raw6_sk(sk); 1054 int val, len; 1055 1056 if (get_user(len,optlen)) 1057 return -EFAULT; 1058 1059 switch (optname) { 1060 case IPV6_CHECKSUM: 1061 /* 1062 * We allow getsockopt() for IPPROTO_IPV6-level 1063 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1064 * since RFC3542 is silent about it. 1065 */ 1066 if (rp->checksum == 0) 1067 val = -1; 1068 else 1069 val = rp->offset; 1070 break; 1071 1072 default: 1073 return -ENOPROTOOPT; 1074 } 1075 1076 len = min_t(unsigned int, sizeof(int), len); 1077 1078 if (put_user(len, optlen)) 1079 return -EFAULT; 1080 if (copy_to_user(optval,&val,len)) 1081 return -EFAULT; 1082 return 0; 1083 } 1084 1085 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1086 char __user *optval, int __user *optlen) 1087 { 1088 switch (level) { 1089 case SOL_RAW: 1090 break; 1091 1092 case SOL_ICMPV6: 1093 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1094 return -EOPNOTSUPP; 1095 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1096 case SOL_IPV6: 1097 if (optname == IPV6_CHECKSUM) 1098 break; 1099 default: 1100 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1101 } 1102 1103 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1104 } 1105 1106 #ifdef CONFIG_COMPAT 1107 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1108 char __user *optval, int __user *optlen) 1109 { 1110 switch (level) { 1111 case SOL_RAW: 1112 break; 1113 case SOL_ICMPV6: 1114 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1115 return -EOPNOTSUPP; 1116 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1117 case SOL_IPV6: 1118 if (optname == IPV6_CHECKSUM) 1119 break; 1120 default: 1121 return compat_ipv6_getsockopt(sk, level, optname, 1122 optval, optlen); 1123 } 1124 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1125 } 1126 #endif 1127 1128 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1129 { 1130 switch (cmd) { 1131 case SIOCOUTQ: { 1132 int amount = sk_wmem_alloc_get(sk); 1133 1134 return put_user(amount, (int __user *)arg); 1135 } 1136 case SIOCINQ: { 1137 struct sk_buff *skb; 1138 int amount = 0; 1139 1140 spin_lock_bh(&sk->sk_receive_queue.lock); 1141 skb = skb_peek(&sk->sk_receive_queue); 1142 if (skb != NULL) 1143 amount = skb_tail_pointer(skb) - 1144 skb_transport_header(skb); 1145 spin_unlock_bh(&sk->sk_receive_queue.lock); 1146 return put_user(amount, (int __user *)arg); 1147 } 1148 1149 default: 1150 #ifdef CONFIG_IPV6_MROUTE 1151 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1152 #else 1153 return -ENOIOCTLCMD; 1154 #endif 1155 } 1156 } 1157 1158 #ifdef CONFIG_COMPAT 1159 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 1160 { 1161 switch (cmd) { 1162 case SIOCOUTQ: 1163 case SIOCINQ: 1164 return -ENOIOCTLCMD; 1165 default: 1166 #ifdef CONFIG_IPV6_MROUTE 1167 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); 1168 #else 1169 return -ENOIOCTLCMD; 1170 #endif 1171 } 1172 } 1173 #endif 1174 1175 static void rawv6_close(struct sock *sk, long timeout) 1176 { 1177 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1178 ip6_ra_control(sk, -1); 1179 ip6mr_sk_done(sk); 1180 sk_common_release(sk); 1181 } 1182 1183 static void raw6_destroy(struct sock *sk) 1184 { 1185 lock_sock(sk); 1186 ip6_flush_pending_frames(sk); 1187 release_sock(sk); 1188 1189 inet6_destroy_sock(sk); 1190 } 1191 1192 static int rawv6_init_sk(struct sock *sk) 1193 { 1194 struct raw6_sock *rp = raw6_sk(sk); 1195 1196 switch (inet_sk(sk)->inet_num) { 1197 case IPPROTO_ICMPV6: 1198 rp->checksum = 1; 1199 rp->offset = 2; 1200 break; 1201 case IPPROTO_MH: 1202 rp->checksum = 1; 1203 rp->offset = 4; 1204 break; 1205 default: 1206 break; 1207 } 1208 return 0; 1209 } 1210 1211 struct proto rawv6_prot = { 1212 .name = "RAWv6", 1213 .owner = THIS_MODULE, 1214 .close = rawv6_close, 1215 .destroy = raw6_destroy, 1216 .connect = ip6_datagram_connect, 1217 .disconnect = udp_disconnect, 1218 .ioctl = rawv6_ioctl, 1219 .init = rawv6_init_sk, 1220 .setsockopt = rawv6_setsockopt, 1221 .getsockopt = rawv6_getsockopt, 1222 .sendmsg = rawv6_sendmsg, 1223 .recvmsg = rawv6_recvmsg, 1224 .bind = rawv6_bind, 1225 .backlog_rcv = rawv6_rcv_skb, 1226 .hash = raw_hash_sk, 1227 .unhash = raw_unhash_sk, 1228 .obj_size = sizeof(struct raw6_sock), 1229 .h.raw_hash = &raw_v6_hashinfo, 1230 #ifdef CONFIG_COMPAT 1231 .compat_setsockopt = compat_rawv6_setsockopt, 1232 .compat_getsockopt = compat_rawv6_getsockopt, 1233 .compat_ioctl = compat_rawv6_ioctl, 1234 #endif 1235 }; 1236 1237 #ifdef CONFIG_PROC_FS 1238 static int raw6_seq_show(struct seq_file *seq, void *v) 1239 { 1240 if (v == SEQ_START_TOKEN) { 1241 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1242 } else { 1243 struct sock *sp = v; 1244 __u16 srcp = inet_sk(sp)->inet_num; 1245 ip6_dgram_sock_seq_show(seq, v, srcp, 0, 1246 raw_seq_private(seq)->bucket); 1247 } 1248 return 0; 1249 } 1250 1251 static const struct seq_operations raw6_seq_ops = { 1252 .start = raw_seq_start, 1253 .next = raw_seq_next, 1254 .stop = raw_seq_stop, 1255 .show = raw6_seq_show, 1256 }; 1257 1258 static int raw6_seq_open(struct inode *inode, struct file *file) 1259 { 1260 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1261 } 1262 1263 static const struct file_operations raw6_seq_fops = { 1264 .owner = THIS_MODULE, 1265 .open = raw6_seq_open, 1266 .read = seq_read, 1267 .llseek = seq_lseek, 1268 .release = seq_release_net, 1269 }; 1270 1271 static int __net_init raw6_init_net(struct net *net) 1272 { 1273 if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops)) 1274 return -ENOMEM; 1275 1276 return 0; 1277 } 1278 1279 static void __net_exit raw6_exit_net(struct net *net) 1280 { 1281 remove_proc_entry("raw6", net->proc_net); 1282 } 1283 1284 static struct pernet_operations raw6_net_ops = { 1285 .init = raw6_init_net, 1286 .exit = raw6_exit_net, 1287 }; 1288 1289 int __init raw6_proc_init(void) 1290 { 1291 return register_pernet_subsys(&raw6_net_ops); 1292 } 1293 1294 void raw6_proc_exit(void) 1295 { 1296 unregister_pernet_subsys(&raw6_net_ops); 1297 } 1298 #endif /* CONFIG_PROC_FS */ 1299 1300 /* Same as inet6_dgram_ops, sans udp_poll. */ 1301 static const struct proto_ops inet6_sockraw_ops = { 1302 .family = PF_INET6, 1303 .owner = THIS_MODULE, 1304 .release = inet6_release, 1305 .bind = inet6_bind, 1306 .connect = inet_dgram_connect, /* ok */ 1307 .socketpair = sock_no_socketpair, /* a do nothing */ 1308 .accept = sock_no_accept, /* a do nothing */ 1309 .getname = inet6_getname, 1310 .poll = datagram_poll, /* ok */ 1311 .ioctl = inet6_ioctl, /* must change */ 1312 .listen = sock_no_listen, /* ok */ 1313 .shutdown = inet_shutdown, /* ok */ 1314 .setsockopt = sock_common_setsockopt, /* ok */ 1315 .getsockopt = sock_common_getsockopt, /* ok */ 1316 .sendmsg = inet_sendmsg, /* ok */ 1317 .recvmsg = sock_common_recvmsg, /* ok */ 1318 .mmap = sock_no_mmap, 1319 .sendpage = sock_no_sendpage, 1320 #ifdef CONFIG_COMPAT 1321 .compat_setsockopt = compat_sock_common_setsockopt, 1322 .compat_getsockopt = compat_sock_common_getsockopt, 1323 #endif 1324 }; 1325 1326 static struct inet_protosw rawv6_protosw = { 1327 .type = SOCK_RAW, 1328 .protocol = IPPROTO_IP, /* wild card */ 1329 .prot = &rawv6_prot, 1330 .ops = &inet6_sockraw_ops, 1331 .no_check = UDP_CSUM_DEFAULT, 1332 .flags = INET_PROTOSW_REUSE, 1333 }; 1334 1335 int __init rawv6_init(void) 1336 { 1337 int ret; 1338 1339 ret = inet6_register_protosw(&rawv6_protosw); 1340 if (ret) 1341 goto out; 1342 out: 1343 return ret; 1344 } 1345 1346 void rawv6_exit(void) 1347 { 1348 inet6_unregister_protosw(&rawv6_protosw); 1349 } 1350