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 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 bool 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 int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb) 111 { 112 struct icmp6hdr *_hdr; 113 const struct icmp6hdr *hdr; 114 115 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 116 sizeof(_hdr), &_hdr); 117 if (hdr) { 118 const __u32 *data = &raw6_sk(sk)->filter.data[0]; 119 unsigned int type = hdr->icmp6_type; 120 121 return (data[type >> 5] & (1U << (type & 31))) != 0; 122 } 123 return 1; 124 } 125 126 #if IS_ENABLED(CONFIG_IPV6_MIP6) 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_INIT_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 bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 156 { 157 const struct in6_addr *saddr; 158 const struct in6_addr *daddr; 159 struct sock *sk; 160 bool delivered = false; 161 __u8 hash; 162 struct net *net; 163 164 saddr = &ipv6_hdr(skb)->saddr; 165 daddr = saddr + 1; 166 167 hash = nexthdr & (RAW_HTABLE_SIZE - 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 = true; 182 switch (nexthdr) { 183 case IPPROTO_ICMPV6: 184 filtered = icmpv6_filter(sk, skb); 185 break; 186 187 #if IS_ENABLED(CONFIG_IPV6_MIP6) 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 bool 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 & (RAW_HTABLE_SIZE - 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 np->rcv_saddr = addr->sin6_addr; 302 if (!(addr_type & IPV6_ADDR_MULTICAST)) 303 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 ip6_sk_update_pmtu(skb, sk, info); 332 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 333 } 334 if (type == NDISC_REDIRECT) 335 ip6_sk_redirect(skb, sk); 336 if (np->recverr) { 337 u8 *payload = skb->data; 338 if (!inet->hdrincl) 339 payload += offset; 340 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 341 } 342 343 if (np->recverr || harderr) { 344 sk->sk_err = err; 345 sk->sk_error_report(sk); 346 } 347 } 348 349 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 350 u8 type, u8 code, int inner_offset, __be32 info) 351 { 352 struct sock *sk; 353 int hash; 354 const struct in6_addr *saddr, *daddr; 355 struct net *net; 356 357 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 358 359 read_lock(&raw_v6_hashinfo.lock); 360 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 361 if (sk != NULL) { 362 /* Note: ipv6_hdr(skb) != skb->data */ 363 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data; 364 saddr = &ip6h->saddr; 365 daddr = &ip6h->daddr; 366 net = dev_net(skb->dev); 367 368 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, 369 IP6CB(skb)->iif))) { 370 rawv6_err(sk, skb, NULL, type, code, 371 inner_offset, info); 372 sk = sk_next(sk); 373 } 374 } 375 read_unlock(&raw_v6_hashinfo.lock); 376 } 377 378 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb) 379 { 380 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) && 381 skb_checksum_complete(skb)) { 382 atomic_inc(&sk->sk_drops); 383 kfree_skb(skb); 384 return NET_RX_DROP; 385 } 386 387 /* Charge it to the socket. */ 388 skb_dst_drop(skb); 389 if (sock_queue_rcv_skb(sk, skb) < 0) { 390 kfree_skb(skb); 391 return NET_RX_DROP; 392 } 393 394 return 0; 395 } 396 397 /* 398 * This is next to useless... 399 * if we demultiplex in network layer we don't need the extra call 400 * just to queue the skb... 401 * maybe we could have the network decide upon a hint if it 402 * should call raw_rcv for demultiplexing 403 */ 404 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 405 { 406 struct inet_sock *inet = inet_sk(sk); 407 struct raw6_sock *rp = raw6_sk(sk); 408 409 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 410 atomic_inc(&sk->sk_drops); 411 kfree_skb(skb); 412 return NET_RX_DROP; 413 } 414 415 if (!rp->checksum) 416 skb->ip_summed = CHECKSUM_UNNECESSARY; 417 418 if (skb->ip_summed == CHECKSUM_COMPLETE) { 419 skb_postpull_rcsum(skb, skb_network_header(skb), 420 skb_network_header_len(skb)); 421 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 422 &ipv6_hdr(skb)->daddr, 423 skb->len, inet->inet_num, skb->csum)) 424 skb->ip_summed = CHECKSUM_UNNECESSARY; 425 } 426 if (!skb_csum_unnecessary(skb)) 427 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 428 &ipv6_hdr(skb)->daddr, 429 skb->len, 430 inet->inet_num, 0)); 431 432 if (inet->hdrincl) { 433 if (skb_checksum_complete(skb)) { 434 atomic_inc(&sk->sk_drops); 435 kfree_skb(skb); 436 return NET_RX_DROP; 437 } 438 } 439 440 rawv6_rcv_skb(sk, skb); 441 return 0; 442 } 443 444 445 /* 446 * This should be easy, if there is something there 447 * we return it, otherwise we block. 448 */ 449 450 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 451 struct msghdr *msg, size_t len, 452 int noblock, int flags, int *addr_len) 453 { 454 struct ipv6_pinfo *np = inet6_sk(sk); 455 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 456 struct sk_buff *skb; 457 size_t copied; 458 int err; 459 460 if (flags & MSG_OOB) 461 return -EOPNOTSUPP; 462 463 if (addr_len) 464 *addr_len=sizeof(*sin6); 465 466 if (flags & MSG_ERRQUEUE) 467 return ipv6_recv_error(sk, msg, len); 468 469 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 470 return ipv6_recv_rxpmtu(sk, msg, len); 471 472 skb = skb_recv_datagram(sk, flags, noblock, &err); 473 if (!skb) 474 goto out; 475 476 copied = skb->len; 477 if (copied > len) { 478 copied = len; 479 msg->msg_flags |= MSG_TRUNC; 480 } 481 482 if (skb_csum_unnecessary(skb)) { 483 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 484 } else if (msg->msg_flags&MSG_TRUNC) { 485 if (__skb_checksum_complete(skb)) 486 goto csum_copy_err; 487 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 488 } else { 489 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 490 if (err == -EINVAL) 491 goto csum_copy_err; 492 } 493 if (err) 494 goto out_free; 495 496 /* Copy the address. */ 497 if (sin6) { 498 sin6->sin6_family = AF_INET6; 499 sin6->sin6_port = 0; 500 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 501 sin6->sin6_flowinfo = 0; 502 sin6->sin6_scope_id = 0; 503 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) 504 sin6->sin6_scope_id = IP6CB(skb)->iif; 505 } 506 507 sock_recv_ts_and_drops(msg, sk, skb); 508 509 if (np->rxopt.all) 510 ip6_datagram_recv_ctl(sk, msg, skb); 511 512 err = copied; 513 if (flags & MSG_TRUNC) 514 err = skb->len; 515 516 out_free: 517 skb_free_datagram(sk, skb); 518 out: 519 return err; 520 521 csum_copy_err: 522 skb_kill_datagram(sk, skb, flags); 523 524 /* Error for blocking case is chosen to masquerade 525 as some normal condition. 526 */ 527 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 528 goto out; 529 } 530 531 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 532 struct raw6_sock *rp) 533 { 534 struct sk_buff *skb; 535 int err = 0; 536 int offset; 537 int len; 538 int total_len; 539 __wsum tmp_csum; 540 __sum16 csum; 541 542 if (!rp->checksum) 543 goto send; 544 545 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 546 goto out; 547 548 offset = rp->offset; 549 total_len = inet_sk(sk)->cork.base.length; 550 if (offset >= total_len - 1) { 551 err = -EINVAL; 552 ip6_flush_pending_frames(sk); 553 goto out; 554 } 555 556 /* should be check HW csum miyazawa */ 557 if (skb_queue_len(&sk->sk_write_queue) == 1) { 558 /* 559 * Only one fragment on the socket. 560 */ 561 tmp_csum = skb->csum; 562 } else { 563 struct sk_buff *csum_skb = NULL; 564 tmp_csum = 0; 565 566 skb_queue_walk(&sk->sk_write_queue, skb) { 567 tmp_csum = csum_add(tmp_csum, skb->csum); 568 569 if (csum_skb) 570 continue; 571 572 len = skb->len - skb_transport_offset(skb); 573 if (offset >= len) { 574 offset -= len; 575 continue; 576 } 577 578 csum_skb = skb; 579 } 580 581 skb = csum_skb; 582 } 583 584 offset += skb_transport_offset(skb); 585 if (skb_copy_bits(skb, offset, &csum, 2)) 586 BUG(); 587 588 /* in case cksum was not initialized */ 589 if (unlikely(csum)) 590 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 591 592 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 593 total_len, fl6->flowi6_proto, tmp_csum); 594 595 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP) 596 csum = CSUM_MANGLED_0; 597 598 if (skb_store_bits(skb, offset, &csum, 2)) 599 BUG(); 600 601 send: 602 err = ip6_push_pending_frames(sk); 603 out: 604 return err; 605 } 606 607 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 608 struct flowi6 *fl6, struct dst_entry **dstp, 609 unsigned int flags) 610 { 611 struct ipv6_pinfo *np = inet6_sk(sk); 612 struct ipv6hdr *iph; 613 struct sk_buff *skb; 614 int err; 615 struct rt6_info *rt = (struct rt6_info *)*dstp; 616 int hlen = LL_RESERVED_SPACE(rt->dst.dev); 617 int tlen = rt->dst.dev->needed_tailroom; 618 619 if (length > rt->dst.dev->mtu) { 620 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu); 621 return -EMSGSIZE; 622 } 623 if (flags&MSG_PROBE) 624 goto out; 625 626 skb = sock_alloc_send_skb(sk, 627 length + hlen + tlen + 15, 628 flags & MSG_DONTWAIT, &err); 629 if (skb == NULL) 630 goto error; 631 skb_reserve(skb, hlen); 632 633 skb->priority = sk->sk_priority; 634 skb->mark = sk->sk_mark; 635 skb_dst_set(skb, &rt->dst); 636 *dstp = NULL; 637 638 skb_put(skb, length); 639 skb_reset_network_header(skb); 640 iph = ipv6_hdr(skb); 641 642 skb->ip_summed = CHECKSUM_NONE; 643 644 skb->transport_header = skb->network_header; 645 err = memcpy_fromiovecend((void *)iph, from, 0, length); 646 if (err) 647 goto error_fault; 648 649 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); 650 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, 651 rt->dst.dev, dst_output); 652 if (err > 0) 653 err = net_xmit_errno(err); 654 if (err) 655 goto error; 656 out: 657 return 0; 658 659 error_fault: 660 err = -EFAULT; 661 kfree_skb(skb); 662 error: 663 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 664 if (err == -ENOBUFS && !np->recverr) 665 err = 0; 666 return err; 667 } 668 669 static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg) 670 { 671 struct iovec *iov; 672 u8 __user *type = NULL; 673 u8 __user *code = NULL; 674 u8 len = 0; 675 int probed = 0; 676 int i; 677 678 if (!msg->msg_iov) 679 return 0; 680 681 for (i = 0; i < msg->msg_iovlen; i++) { 682 iov = &msg->msg_iov[i]; 683 if (!iov) 684 continue; 685 686 switch (fl6->flowi6_proto) { 687 case IPPROTO_ICMPV6: 688 /* check if one-byte field is readable or not. */ 689 if (iov->iov_base && iov->iov_len < 1) 690 break; 691 692 if (!type) { 693 type = iov->iov_base; 694 /* check if code field is readable or not. */ 695 if (iov->iov_len > 1) 696 code = type + 1; 697 } else if (!code) 698 code = iov->iov_base; 699 700 if (type && code) { 701 if (get_user(fl6->fl6_icmp_type, type) || 702 get_user(fl6->fl6_icmp_code, code)) 703 return -EFAULT; 704 probed = 1; 705 } 706 break; 707 case IPPROTO_MH: 708 if (iov->iov_base && iov->iov_len < 1) 709 break; 710 /* check if type field is readable or not. */ 711 if (iov->iov_len > 2 - len) { 712 u8 __user *p = iov->iov_base; 713 if (get_user(fl6->fl6_mh_type, &p[2 - len])) 714 return -EFAULT; 715 probed = 1; 716 } else 717 len += iov->iov_len; 718 719 break; 720 default: 721 probed = 1; 722 break; 723 } 724 if (probed) 725 break; 726 } 727 return 0; 728 } 729 730 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 731 struct msghdr *msg, size_t len) 732 { 733 struct ipv6_txoptions opt_space; 734 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 735 struct in6_addr *daddr, *final_p, final; 736 struct inet_sock *inet = inet_sk(sk); 737 struct ipv6_pinfo *np = inet6_sk(sk); 738 struct raw6_sock *rp = raw6_sk(sk); 739 struct ipv6_txoptions *opt = NULL; 740 struct ip6_flowlabel *flowlabel = NULL; 741 struct dst_entry *dst = NULL; 742 struct flowi6 fl6; 743 int addr_len = msg->msg_namelen; 744 int hlimit = -1; 745 int tclass = -1; 746 int dontfrag = -1; 747 u16 proto; 748 int err; 749 750 /* Rough check on arithmetic overflow, 751 better check is made in ip6_append_data(). 752 */ 753 if (len > INT_MAX) 754 return -EMSGSIZE; 755 756 /* Mirror BSD error message compatibility */ 757 if (msg->msg_flags & MSG_OOB) 758 return -EOPNOTSUPP; 759 760 /* 761 * Get and verify the address. 762 */ 763 memset(&fl6, 0, sizeof(fl6)); 764 765 fl6.flowi6_mark = sk->sk_mark; 766 767 if (sin6) { 768 if (addr_len < SIN6_LEN_RFC2133) 769 return -EINVAL; 770 771 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 772 return -EAFNOSUPPORT; 773 774 /* port is the proto value [0..255] carried in nexthdr */ 775 proto = ntohs(sin6->sin6_port); 776 777 if (!proto) 778 proto = inet->inet_num; 779 else if (proto != inet->inet_num) 780 return -EINVAL; 781 782 if (proto > 255) 783 return -EINVAL; 784 785 daddr = &sin6->sin6_addr; 786 if (np->sndflow) { 787 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 788 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 789 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 790 if (flowlabel == NULL) 791 return -EINVAL; 792 daddr = &flowlabel->dst; 793 } 794 } 795 796 /* 797 * Otherwise it will be difficult to maintain 798 * sk->sk_dst_cache. 799 */ 800 if (sk->sk_state == TCP_ESTABLISHED && 801 ipv6_addr_equal(daddr, &np->daddr)) 802 daddr = &np->daddr; 803 804 if (addr_len >= sizeof(struct sockaddr_in6) && 805 sin6->sin6_scope_id && 806 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) 807 fl6.flowi6_oif = sin6->sin6_scope_id; 808 } else { 809 if (sk->sk_state != TCP_ESTABLISHED) 810 return -EDESTADDRREQ; 811 812 proto = inet->inet_num; 813 daddr = &np->daddr; 814 fl6.flowlabel = np->flow_label; 815 } 816 817 if (fl6.flowi6_oif == 0) 818 fl6.flowi6_oif = sk->sk_bound_dev_if; 819 820 if (msg->msg_controllen) { 821 opt = &opt_space; 822 memset(opt, 0, sizeof(struct ipv6_txoptions)); 823 opt->tot_len = sizeof(struct ipv6_txoptions); 824 825 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 826 &hlimit, &tclass, &dontfrag); 827 if (err < 0) { 828 fl6_sock_release(flowlabel); 829 return err; 830 } 831 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 832 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 833 if (flowlabel == NULL) 834 return -EINVAL; 835 } 836 if (!(opt->opt_nflen|opt->opt_flen)) 837 opt = NULL; 838 } 839 if (opt == NULL) 840 opt = np->opt; 841 if (flowlabel) 842 opt = fl6_merge_options(&opt_space, flowlabel, opt); 843 opt = ipv6_fixup_options(&opt_space, opt); 844 845 fl6.flowi6_proto = proto; 846 err = rawv6_probe_proto_opt(&fl6, msg); 847 if (err) 848 goto out; 849 850 if (!ipv6_addr_any(daddr)) 851 fl6.daddr = *daddr; 852 else 853 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 854 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 855 fl6.saddr = np->saddr; 856 857 final_p = fl6_update_dst(&fl6, opt, &final); 858 859 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 860 fl6.flowi6_oif = np->mcast_oif; 861 else if (!fl6.flowi6_oif) 862 fl6.flowi6_oif = np->ucast_oif; 863 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 864 865 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); 866 if (IS_ERR(dst)) { 867 err = PTR_ERR(dst); 868 goto out; 869 } 870 if (hlimit < 0) { 871 if (ipv6_addr_is_multicast(&fl6.daddr)) 872 hlimit = np->mcast_hops; 873 else 874 hlimit = np->hop_limit; 875 if (hlimit < 0) 876 hlimit = ip6_dst_hoplimit(dst); 877 } 878 879 if (tclass < 0) 880 tclass = np->tclass; 881 882 if (dontfrag < 0) 883 dontfrag = np->dontfrag; 884 885 if (msg->msg_flags&MSG_CONFIRM) 886 goto do_confirm; 887 888 back_from_confirm: 889 if (inet->hdrincl) 890 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags); 891 else { 892 lock_sock(sk); 893 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 894 len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst, 895 msg->msg_flags, dontfrag); 896 897 if (err) 898 ip6_flush_pending_frames(sk); 899 else if (!(msg->msg_flags & MSG_MORE)) 900 err = rawv6_push_pending_frames(sk, &fl6, rp); 901 release_sock(sk); 902 } 903 done: 904 dst_release(dst); 905 out: 906 fl6_sock_release(flowlabel); 907 return err<0?err:len; 908 do_confirm: 909 dst_confirm(dst); 910 if (!(msg->msg_flags & MSG_PROBE) || len) 911 goto back_from_confirm; 912 err = 0; 913 goto done; 914 } 915 916 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 917 char __user *optval, int optlen) 918 { 919 switch (optname) { 920 case ICMPV6_FILTER: 921 if (optlen > sizeof(struct icmp6_filter)) 922 optlen = sizeof(struct icmp6_filter); 923 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 924 return -EFAULT; 925 return 0; 926 default: 927 return -ENOPROTOOPT; 928 } 929 930 return 0; 931 } 932 933 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 934 char __user *optval, int __user *optlen) 935 { 936 int len; 937 938 switch (optname) { 939 case ICMPV6_FILTER: 940 if (get_user(len, optlen)) 941 return -EFAULT; 942 if (len < 0) 943 return -EINVAL; 944 if (len > sizeof(struct icmp6_filter)) 945 len = sizeof(struct icmp6_filter); 946 if (put_user(len, optlen)) 947 return -EFAULT; 948 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 949 return -EFAULT; 950 return 0; 951 default: 952 return -ENOPROTOOPT; 953 } 954 955 return 0; 956 } 957 958 959 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 960 char __user *optval, unsigned int optlen) 961 { 962 struct raw6_sock *rp = raw6_sk(sk); 963 int val; 964 965 if (get_user(val, (int __user *)optval)) 966 return -EFAULT; 967 968 switch (optname) { 969 case IPV6_CHECKSUM: 970 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 971 level == IPPROTO_IPV6) { 972 /* 973 * RFC3542 tells that IPV6_CHECKSUM socket 974 * option in the IPPROTO_IPV6 level is not 975 * allowed on ICMPv6 sockets. 976 * If you want to set it, use IPPROTO_RAW 977 * level IPV6_CHECKSUM socket option 978 * (Linux extension). 979 */ 980 return -EINVAL; 981 } 982 983 /* You may get strange result with a positive odd offset; 984 RFC2292bis agrees with me. */ 985 if (val > 0 && (val&1)) 986 return -EINVAL; 987 if (val < 0) { 988 rp->checksum = 0; 989 } else { 990 rp->checksum = 1; 991 rp->offset = val; 992 } 993 994 return 0; 995 996 default: 997 return -ENOPROTOOPT; 998 } 999 } 1000 1001 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1002 char __user *optval, unsigned int optlen) 1003 { 1004 switch (level) { 1005 case SOL_RAW: 1006 break; 1007 1008 case SOL_ICMPV6: 1009 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1010 return -EOPNOTSUPP; 1011 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1012 case SOL_IPV6: 1013 if (optname == IPV6_CHECKSUM) 1014 break; 1015 default: 1016 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1017 } 1018 1019 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1020 } 1021 1022 #ifdef CONFIG_COMPAT 1023 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1024 char __user *optval, unsigned int optlen) 1025 { 1026 switch (level) { 1027 case SOL_RAW: 1028 break; 1029 case SOL_ICMPV6: 1030 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1031 return -EOPNOTSUPP; 1032 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1033 case SOL_IPV6: 1034 if (optname == IPV6_CHECKSUM) 1035 break; 1036 default: 1037 return compat_ipv6_setsockopt(sk, level, optname, 1038 optval, optlen); 1039 } 1040 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1041 } 1042 #endif 1043 1044 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1045 char __user *optval, int __user *optlen) 1046 { 1047 struct raw6_sock *rp = raw6_sk(sk); 1048 int val, len; 1049 1050 if (get_user(len,optlen)) 1051 return -EFAULT; 1052 1053 switch (optname) { 1054 case IPV6_CHECKSUM: 1055 /* 1056 * We allow getsockopt() for IPPROTO_IPV6-level 1057 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1058 * since RFC3542 is silent about it. 1059 */ 1060 if (rp->checksum == 0) 1061 val = -1; 1062 else 1063 val = rp->offset; 1064 break; 1065 1066 default: 1067 return -ENOPROTOOPT; 1068 } 1069 1070 len = min_t(unsigned int, sizeof(int), len); 1071 1072 if (put_user(len, optlen)) 1073 return -EFAULT; 1074 if (copy_to_user(optval,&val,len)) 1075 return -EFAULT; 1076 return 0; 1077 } 1078 1079 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1080 char __user *optval, int __user *optlen) 1081 { 1082 switch (level) { 1083 case SOL_RAW: 1084 break; 1085 1086 case SOL_ICMPV6: 1087 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1088 return -EOPNOTSUPP; 1089 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1090 case SOL_IPV6: 1091 if (optname == IPV6_CHECKSUM) 1092 break; 1093 default: 1094 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1095 } 1096 1097 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1098 } 1099 1100 #ifdef CONFIG_COMPAT 1101 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1102 char __user *optval, int __user *optlen) 1103 { 1104 switch (level) { 1105 case SOL_RAW: 1106 break; 1107 case SOL_ICMPV6: 1108 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1109 return -EOPNOTSUPP; 1110 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1111 case SOL_IPV6: 1112 if (optname == IPV6_CHECKSUM) 1113 break; 1114 default: 1115 return compat_ipv6_getsockopt(sk, level, optname, 1116 optval, optlen); 1117 } 1118 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1119 } 1120 #endif 1121 1122 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1123 { 1124 switch (cmd) { 1125 case SIOCOUTQ: { 1126 int amount = sk_wmem_alloc_get(sk); 1127 1128 return put_user(amount, (int __user *)arg); 1129 } 1130 case SIOCINQ: { 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 const 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 %pK %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 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1254 0, 1255 sock_i_ino(sp), 1256 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1257 } 1258 1259 static int raw6_seq_show(struct seq_file *seq, void *v) 1260 { 1261 if (v == SEQ_START_TOKEN) 1262 seq_printf(seq, 1263 " sl " 1264 "local_address " 1265 "remote_address " 1266 "st tx_queue rx_queue tr tm->when retrnsmt" 1267 " uid timeout inode ref pointer drops\n"); 1268 else 1269 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1270 return 0; 1271 } 1272 1273 static const struct seq_operations raw6_seq_ops = { 1274 .start = raw_seq_start, 1275 .next = raw_seq_next, 1276 .stop = raw_seq_stop, 1277 .show = raw6_seq_show, 1278 }; 1279 1280 static int raw6_seq_open(struct inode *inode, struct file *file) 1281 { 1282 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1283 } 1284 1285 static const struct file_operations raw6_seq_fops = { 1286 .owner = THIS_MODULE, 1287 .open = raw6_seq_open, 1288 .read = seq_read, 1289 .llseek = seq_lseek, 1290 .release = seq_release_net, 1291 }; 1292 1293 static int __net_init raw6_init_net(struct net *net) 1294 { 1295 if (!proc_net_fops_create(net, "raw6", S_IRUGO, &raw6_seq_fops)) 1296 return -ENOMEM; 1297 1298 return 0; 1299 } 1300 1301 static void __net_exit raw6_exit_net(struct net *net) 1302 { 1303 proc_net_remove(net, "raw6"); 1304 } 1305 1306 static struct pernet_operations raw6_net_ops = { 1307 .init = raw6_init_net, 1308 .exit = raw6_exit_net, 1309 }; 1310 1311 int __init raw6_proc_init(void) 1312 { 1313 return register_pernet_subsys(&raw6_net_ops); 1314 } 1315 1316 void raw6_proc_exit(void) 1317 { 1318 unregister_pernet_subsys(&raw6_net_ops); 1319 } 1320 #endif /* CONFIG_PROC_FS */ 1321 1322 /* Same as inet6_dgram_ops, sans udp_poll. */ 1323 static const struct proto_ops inet6_sockraw_ops = { 1324 .family = PF_INET6, 1325 .owner = THIS_MODULE, 1326 .release = inet6_release, 1327 .bind = inet6_bind, 1328 .connect = inet_dgram_connect, /* ok */ 1329 .socketpair = sock_no_socketpair, /* a do nothing */ 1330 .accept = sock_no_accept, /* a do nothing */ 1331 .getname = inet6_getname, 1332 .poll = datagram_poll, /* ok */ 1333 .ioctl = inet6_ioctl, /* must change */ 1334 .listen = sock_no_listen, /* ok */ 1335 .shutdown = inet_shutdown, /* ok */ 1336 .setsockopt = sock_common_setsockopt, /* ok */ 1337 .getsockopt = sock_common_getsockopt, /* ok */ 1338 .sendmsg = inet_sendmsg, /* ok */ 1339 .recvmsg = sock_common_recvmsg, /* ok */ 1340 .mmap = sock_no_mmap, 1341 .sendpage = sock_no_sendpage, 1342 #ifdef CONFIG_COMPAT 1343 .compat_setsockopt = compat_sock_common_setsockopt, 1344 .compat_getsockopt = compat_sock_common_getsockopt, 1345 #endif 1346 }; 1347 1348 static struct inet_protosw rawv6_protosw = { 1349 .type = SOCK_RAW, 1350 .protocol = IPPROTO_IP, /* wild card */ 1351 .prot = &rawv6_prot, 1352 .ops = &inet6_sockraw_ops, 1353 .no_check = UDP_CSUM_DEFAULT, 1354 .flags = INET_PROTOSW_REUSE, 1355 }; 1356 1357 int __init rawv6_init(void) 1358 { 1359 int ret; 1360 1361 ret = inet6_register_protosw(&rawv6_protosw); 1362 if (ret) 1363 goto out; 1364 out: 1365 return ret; 1366 } 1367 1368 void rawv6_exit(void) 1369 { 1370 inet6_unregister_protosw(&rawv6_protosw); 1371 } 1372