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 bool is_multicast = ipv6_addr_is_multicast(loc_addr); 75 76 sk_for_each_from(sk) 77 if (inet_sk(sk)->inet_num == num) { 78 struct ipv6_pinfo *np = inet6_sk(sk); 79 80 if (!net_eq(sock_net(sk), net)) 81 continue; 82 83 if (!ipv6_addr_any(&np->daddr) && 84 !ipv6_addr_equal(&np->daddr, rmt_addr)) 85 continue; 86 87 if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) 88 continue; 89 90 if (!ipv6_addr_any(&np->rcv_saddr)) { 91 if (ipv6_addr_equal(&np->rcv_saddr, loc_addr)) 92 goto found; 93 if (is_multicast && 94 inet6_mc_check(sk, loc_addr, rmt_addr)) 95 goto found; 96 continue; 97 } 98 goto found; 99 } 100 sk = NULL; 101 found: 102 return sk; 103 } 104 105 /* 106 * 0 - deliver 107 * 1 - block 108 */ 109 static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb) 110 { 111 struct icmp6hdr *_hdr; 112 const struct icmp6hdr *hdr; 113 114 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 115 sizeof(_hdr), &_hdr); 116 if (hdr) { 117 const __u32 *data = &raw6_sk(sk)->filter.data[0]; 118 unsigned int type = hdr->icmp6_type; 119 120 return (data[type >> 5] & (1U << (type & 31))) != 0; 121 } 122 return 1; 123 } 124 125 #if IS_ENABLED(CONFIG_IPV6_MIP6) 126 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb); 127 128 static mh_filter_t __rcu *mh_filter __read_mostly; 129 130 int rawv6_mh_filter_register(mh_filter_t filter) 131 { 132 rcu_assign_pointer(mh_filter, filter); 133 return 0; 134 } 135 EXPORT_SYMBOL(rawv6_mh_filter_register); 136 137 int rawv6_mh_filter_unregister(mh_filter_t filter) 138 { 139 RCU_INIT_POINTER(mh_filter, NULL); 140 synchronize_rcu(); 141 return 0; 142 } 143 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 144 145 #endif 146 147 /* 148 * demultiplex raw sockets. 149 * (should consider queueing the skb in the sock receive_queue 150 * without calling rawv6.c) 151 * 152 * Caller owns SKB so we must make clones. 153 */ 154 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 155 { 156 const struct in6_addr *saddr; 157 const struct in6_addr *daddr; 158 struct sock *sk; 159 bool delivered = false; 160 __u8 hash; 161 struct net *net; 162 163 saddr = &ipv6_hdr(skb)->saddr; 164 daddr = saddr + 1; 165 166 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 167 168 read_lock(&raw_v6_hashinfo.lock); 169 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 170 171 if (sk == NULL) 172 goto out; 173 174 net = dev_net(skb->dev); 175 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, IP6CB(skb)->iif); 176 177 while (sk) { 178 int filtered; 179 180 delivered = true; 181 switch (nexthdr) { 182 case IPPROTO_ICMPV6: 183 filtered = icmpv6_filter(sk, skb); 184 break; 185 186 #if IS_ENABLED(CONFIG_IPV6_MIP6) 187 case IPPROTO_MH: 188 { 189 /* XXX: To validate MH only once for each packet, 190 * this is placed here. It should be after checking 191 * xfrm policy, however it doesn't. The checking xfrm 192 * policy is placed in rawv6_rcv() because it is 193 * required for each socket. 194 */ 195 mh_filter_t *filter; 196 197 filter = rcu_dereference(mh_filter); 198 filtered = filter ? (*filter)(sk, skb) : 0; 199 break; 200 } 201 #endif 202 default: 203 filtered = 0; 204 break; 205 } 206 207 if (filtered < 0) 208 break; 209 if (filtered == 0) { 210 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 211 212 /* Not releasing hash table! */ 213 if (clone) { 214 nf_reset(clone); 215 rawv6_rcv(sk, clone); 216 } 217 } 218 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr, 219 IP6CB(skb)->iif); 220 } 221 out: 222 read_unlock(&raw_v6_hashinfo.lock); 223 return delivered; 224 } 225 226 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr) 227 { 228 struct sock *raw_sk; 229 230 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]); 231 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr)) 232 raw_sk = NULL; 233 234 return raw_sk != NULL; 235 } 236 237 /* This cleans up af_inet6 a bit. -DaveM */ 238 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 239 { 240 struct inet_sock *inet = inet_sk(sk); 241 struct ipv6_pinfo *np = inet6_sk(sk); 242 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 243 __be32 v4addr = 0; 244 int addr_type; 245 int err; 246 247 if (addr_len < SIN6_LEN_RFC2133) 248 return -EINVAL; 249 addr_type = ipv6_addr_type(&addr->sin6_addr); 250 251 /* Raw sockets are IPv6 only */ 252 if (addr_type == IPV6_ADDR_MAPPED) 253 return -EADDRNOTAVAIL; 254 255 lock_sock(sk); 256 257 err = -EINVAL; 258 if (sk->sk_state != TCP_CLOSE) 259 goto out; 260 261 rcu_read_lock(); 262 /* Check if the address belongs to the host. */ 263 if (addr_type != IPV6_ADDR_ANY) { 264 struct net_device *dev = NULL; 265 266 if (__ipv6_addr_needs_scope_id(addr_type)) { 267 if (addr_len >= sizeof(struct sockaddr_in6) && 268 addr->sin6_scope_id) { 269 /* Override any existing binding, if another 270 * one is supplied by user. 271 */ 272 sk->sk_bound_dev_if = addr->sin6_scope_id; 273 } 274 275 /* Binding to link-local address requires an interface */ 276 if (!sk->sk_bound_dev_if) 277 goto out_unlock; 278 279 err = -ENODEV; 280 dev = dev_get_by_index_rcu(sock_net(sk), 281 sk->sk_bound_dev_if); 282 if (!dev) 283 goto out_unlock; 284 } 285 286 /* ipv4 addr of the socket is invalid. Only the 287 * unspecified and mapped address have a v4 equivalent. 288 */ 289 v4addr = LOOPBACK4_IPV6; 290 if (!(addr_type & IPV6_ADDR_MULTICAST)) { 291 err = -EADDRNOTAVAIL; 292 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 293 dev, 0)) { 294 goto out_unlock; 295 } 296 } 297 } 298 299 inet->inet_rcv_saddr = inet->inet_saddr = v4addr; 300 np->rcv_saddr = addr->sin6_addr; 301 if (!(addr_type & IPV6_ADDR_MULTICAST)) 302 np->saddr = addr->sin6_addr; 303 err = 0; 304 out_unlock: 305 rcu_read_unlock(); 306 out: 307 release_sock(sk); 308 return err; 309 } 310 311 static void rawv6_err(struct sock *sk, struct sk_buff *skb, 312 struct inet6_skb_parm *opt, 313 u8 type, u8 code, int offset, __be32 info) 314 { 315 struct inet_sock *inet = inet_sk(sk); 316 struct ipv6_pinfo *np = inet6_sk(sk); 317 int err; 318 int harderr; 319 320 /* Report error on raw socket, if: 321 1. User requested recverr. 322 2. Socket is connected (otherwise the error indication 323 is useless without recverr and error is hard. 324 */ 325 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 326 return; 327 328 harderr = icmpv6_err_convert(type, code, &err); 329 if (type == ICMPV6_PKT_TOOBIG) { 330 ip6_sk_update_pmtu(skb, sk, info); 331 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 332 } 333 if (type == NDISC_REDIRECT) 334 ip6_sk_redirect(skb, sk); 335 if (np->recverr) { 336 u8 *payload = skb->data; 337 if (!inet->hdrincl) 338 payload += offset; 339 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 340 } 341 342 if (np->recverr || harderr) { 343 sk->sk_err = err; 344 sk->sk_error_report(sk); 345 } 346 } 347 348 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 349 u8 type, u8 code, int inner_offset, __be32 info) 350 { 351 struct sock *sk; 352 int hash; 353 const struct in6_addr *saddr, *daddr; 354 struct net *net; 355 356 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 357 358 read_lock(&raw_v6_hashinfo.lock); 359 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 360 if (sk != NULL) { 361 /* Note: ipv6_hdr(skb) != skb->data */ 362 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data; 363 saddr = &ip6h->saddr; 364 daddr = &ip6h->daddr; 365 net = dev_net(skb->dev); 366 367 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, 368 IP6CB(skb)->iif))) { 369 rawv6_err(sk, skb, NULL, type, code, 370 inner_offset, info); 371 sk = sk_next(sk); 372 } 373 } 374 read_unlock(&raw_v6_hashinfo.lock); 375 } 376 377 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb) 378 { 379 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) && 380 skb_checksum_complete(skb)) { 381 atomic_inc(&sk->sk_drops); 382 kfree_skb(skb); 383 return NET_RX_DROP; 384 } 385 386 /* Charge it to the socket. */ 387 skb_dst_drop(skb); 388 if (sock_queue_rcv_skb(sk, skb) < 0) { 389 kfree_skb(skb); 390 return NET_RX_DROP; 391 } 392 393 return 0; 394 } 395 396 /* 397 * This is next to useless... 398 * if we demultiplex in network layer we don't need the extra call 399 * just to queue the skb... 400 * maybe we could have the network decide upon a hint if it 401 * should call raw_rcv for demultiplexing 402 */ 403 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 404 { 405 struct inet_sock *inet = inet_sk(sk); 406 struct raw6_sock *rp = raw6_sk(sk); 407 408 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 409 atomic_inc(&sk->sk_drops); 410 kfree_skb(skb); 411 return NET_RX_DROP; 412 } 413 414 if (!rp->checksum) 415 skb->ip_summed = CHECKSUM_UNNECESSARY; 416 417 if (skb->ip_summed == CHECKSUM_COMPLETE) { 418 skb_postpull_rcsum(skb, skb_network_header(skb), 419 skb_network_header_len(skb)); 420 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 421 &ipv6_hdr(skb)->daddr, 422 skb->len, inet->inet_num, skb->csum)) 423 skb->ip_summed = CHECKSUM_UNNECESSARY; 424 } 425 if (!skb_csum_unnecessary(skb)) 426 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 427 &ipv6_hdr(skb)->daddr, 428 skb->len, 429 inet->inet_num, 0)); 430 431 if (inet->hdrincl) { 432 if (skb_checksum_complete(skb)) { 433 atomic_inc(&sk->sk_drops); 434 kfree_skb(skb); 435 return NET_RX_DROP; 436 } 437 } 438 439 rawv6_rcv_skb(sk, skb); 440 return 0; 441 } 442 443 444 /* 445 * This should be easy, if there is something there 446 * we return it, otherwise we block. 447 */ 448 449 static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, 450 struct msghdr *msg, size_t len, 451 int noblock, int flags, int *addr_len) 452 { 453 struct ipv6_pinfo *np = inet6_sk(sk); 454 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)msg->msg_name; 455 struct sk_buff *skb; 456 size_t copied; 457 int err; 458 459 if (flags & MSG_OOB) 460 return -EOPNOTSUPP; 461 462 if (addr_len) 463 *addr_len=sizeof(*sin6); 464 465 if (flags & MSG_ERRQUEUE) 466 return ipv6_recv_error(sk, msg, len); 467 468 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 469 return ipv6_recv_rxpmtu(sk, msg, len); 470 471 skb = skb_recv_datagram(sk, flags, noblock, &err); 472 if (!skb) 473 goto out; 474 475 copied = skb->len; 476 if (copied > len) { 477 copied = len; 478 msg->msg_flags |= MSG_TRUNC; 479 } 480 481 if (skb_csum_unnecessary(skb)) { 482 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 483 } else if (msg->msg_flags&MSG_TRUNC) { 484 if (__skb_checksum_complete(skb)) 485 goto csum_copy_err; 486 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); 487 } else { 488 err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); 489 if (err == -EINVAL) 490 goto csum_copy_err; 491 } 492 if (err) 493 goto out_free; 494 495 /* Copy the address. */ 496 if (sin6) { 497 sin6->sin6_family = AF_INET6; 498 sin6->sin6_port = 0; 499 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 500 sin6->sin6_flowinfo = 0; 501 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, 502 IP6CB(skb)->iif); 503 } 504 505 sock_recv_ts_and_drops(msg, sk, skb); 506 507 if (np->rxopt.all) 508 ip6_datagram_recv_ctl(sk, msg, skb); 509 510 err = copied; 511 if (flags & MSG_TRUNC) 512 err = skb->len; 513 514 out_free: 515 skb_free_datagram(sk, skb); 516 out: 517 return err; 518 519 csum_copy_err: 520 skb_kill_datagram(sk, skb, flags); 521 522 /* Error for blocking case is chosen to masquerade 523 as some normal condition. 524 */ 525 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 526 goto out; 527 } 528 529 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 530 struct raw6_sock *rp) 531 { 532 struct sk_buff *skb; 533 int err = 0; 534 int offset; 535 int len; 536 int total_len; 537 __wsum tmp_csum; 538 __sum16 csum; 539 540 if (!rp->checksum) 541 goto send; 542 543 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) 544 goto out; 545 546 offset = rp->offset; 547 total_len = inet_sk(sk)->cork.base.length; 548 if (offset >= total_len - 1) { 549 err = -EINVAL; 550 ip6_flush_pending_frames(sk); 551 goto out; 552 } 553 554 /* should be check HW csum miyazawa */ 555 if (skb_queue_len(&sk->sk_write_queue) == 1) { 556 /* 557 * Only one fragment on the socket. 558 */ 559 tmp_csum = skb->csum; 560 } else { 561 struct sk_buff *csum_skb = NULL; 562 tmp_csum = 0; 563 564 skb_queue_walk(&sk->sk_write_queue, skb) { 565 tmp_csum = csum_add(tmp_csum, skb->csum); 566 567 if (csum_skb) 568 continue; 569 570 len = skb->len - skb_transport_offset(skb); 571 if (offset >= len) { 572 offset -= len; 573 continue; 574 } 575 576 csum_skb = skb; 577 } 578 579 skb = csum_skb; 580 } 581 582 offset += skb_transport_offset(skb); 583 if (skb_copy_bits(skb, offset, &csum, 2)) 584 BUG(); 585 586 /* in case cksum was not initialized */ 587 if (unlikely(csum)) 588 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 589 590 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 591 total_len, fl6->flowi6_proto, tmp_csum); 592 593 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP) 594 csum = CSUM_MANGLED_0; 595 596 if (skb_store_bits(skb, offset, &csum, 2)) 597 BUG(); 598 599 send: 600 err = ip6_push_pending_frames(sk); 601 out: 602 return err; 603 } 604 605 static int rawv6_send_hdrinc(struct sock *sk, void *from, int length, 606 struct flowi6 *fl6, struct dst_entry **dstp, 607 unsigned int flags) 608 { 609 struct ipv6_pinfo *np = inet6_sk(sk); 610 struct ipv6hdr *iph; 611 struct sk_buff *skb; 612 int err; 613 struct rt6_info *rt = (struct rt6_info *)*dstp; 614 int hlen = LL_RESERVED_SPACE(rt->dst.dev); 615 int tlen = rt->dst.dev->needed_tailroom; 616 617 if (length > rt->dst.dev->mtu) { 618 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu); 619 return -EMSGSIZE; 620 } 621 if (flags&MSG_PROBE) 622 goto out; 623 624 skb = sock_alloc_send_skb(sk, 625 length + hlen + tlen + 15, 626 flags & MSG_DONTWAIT, &err); 627 if (skb == NULL) 628 goto error; 629 skb_reserve(skb, hlen); 630 631 skb->priority = sk->sk_priority; 632 skb->mark = sk->sk_mark; 633 skb_dst_set(skb, &rt->dst); 634 *dstp = NULL; 635 636 skb_put(skb, length); 637 skb_reset_network_header(skb); 638 iph = ipv6_hdr(skb); 639 640 skb->ip_summed = CHECKSUM_NONE; 641 642 skb->transport_header = skb->network_header; 643 err = memcpy_fromiovecend((void *)iph, from, 0, length); 644 if (err) 645 goto error_fault; 646 647 IP6_UPD_PO_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); 648 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, 649 rt->dst.dev, dst_output); 650 if (err > 0) 651 err = net_xmit_errno(err); 652 if (err) 653 goto error; 654 out: 655 return 0; 656 657 error_fault: 658 err = -EFAULT; 659 kfree_skb(skb); 660 error: 661 IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 662 if (err == -ENOBUFS && !np->recverr) 663 err = 0; 664 return err; 665 } 666 667 static int rawv6_probe_proto_opt(struct flowi6 *fl6, struct msghdr *msg) 668 { 669 struct iovec *iov; 670 u8 __user *type = NULL; 671 u8 __user *code = NULL; 672 u8 len = 0; 673 int probed = 0; 674 int i; 675 676 if (!msg->msg_iov) 677 return 0; 678 679 for (i = 0; i < msg->msg_iovlen; i++) { 680 iov = &msg->msg_iov[i]; 681 if (!iov) 682 continue; 683 684 switch (fl6->flowi6_proto) { 685 case IPPROTO_ICMPV6: 686 /* check if one-byte field is readable or not. */ 687 if (iov->iov_base && iov->iov_len < 1) 688 break; 689 690 if (!type) { 691 type = iov->iov_base; 692 /* check if code field is readable or not. */ 693 if (iov->iov_len > 1) 694 code = type + 1; 695 } else if (!code) 696 code = iov->iov_base; 697 698 if (type && code) { 699 if (get_user(fl6->fl6_icmp_type, type) || 700 get_user(fl6->fl6_icmp_code, code)) 701 return -EFAULT; 702 probed = 1; 703 } 704 break; 705 case IPPROTO_MH: 706 if (iov->iov_base && iov->iov_len < 1) 707 break; 708 /* check if type field is readable or not. */ 709 if (iov->iov_len > 2 - len) { 710 u8 __user *p = iov->iov_base; 711 if (get_user(fl6->fl6_mh_type, &p[2 - len])) 712 return -EFAULT; 713 probed = 1; 714 } else 715 len += iov->iov_len; 716 717 break; 718 default: 719 probed = 1; 720 break; 721 } 722 if (probed) 723 break; 724 } 725 return 0; 726 } 727 728 static int rawv6_sendmsg(struct kiocb *iocb, struct sock *sk, 729 struct msghdr *msg, size_t len) 730 { 731 struct ipv6_txoptions opt_space; 732 struct sockaddr_in6 * sin6 = (struct sockaddr_in6 *) msg->msg_name; 733 struct in6_addr *daddr, *final_p, final; 734 struct inet_sock *inet = inet_sk(sk); 735 struct ipv6_pinfo *np = inet6_sk(sk); 736 struct raw6_sock *rp = raw6_sk(sk); 737 struct ipv6_txoptions *opt = NULL; 738 struct ip6_flowlabel *flowlabel = NULL; 739 struct dst_entry *dst = NULL; 740 struct flowi6 fl6; 741 int addr_len = msg->msg_namelen; 742 int hlimit = -1; 743 int tclass = -1; 744 int dontfrag = -1; 745 u16 proto; 746 int err; 747 748 /* Rough check on arithmetic overflow, 749 better check is made in ip6_append_data(). 750 */ 751 if (len > INT_MAX) 752 return -EMSGSIZE; 753 754 /* Mirror BSD error message compatibility */ 755 if (msg->msg_flags & MSG_OOB) 756 return -EOPNOTSUPP; 757 758 /* 759 * Get and verify the address. 760 */ 761 memset(&fl6, 0, sizeof(fl6)); 762 763 fl6.flowi6_mark = sk->sk_mark; 764 765 if (sin6) { 766 if (addr_len < SIN6_LEN_RFC2133) 767 return -EINVAL; 768 769 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 770 return -EAFNOSUPPORT; 771 772 /* port is the proto value [0..255] carried in nexthdr */ 773 proto = ntohs(sin6->sin6_port); 774 775 if (!proto) 776 proto = inet->inet_num; 777 else if (proto != inet->inet_num) 778 return -EINVAL; 779 780 if (proto > 255) 781 return -EINVAL; 782 783 daddr = &sin6->sin6_addr; 784 if (np->sndflow) { 785 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 786 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 787 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 788 if (flowlabel == NULL) 789 return -EINVAL; 790 daddr = &flowlabel->dst; 791 } 792 } 793 794 /* 795 * Otherwise it will be difficult to maintain 796 * sk->sk_dst_cache. 797 */ 798 if (sk->sk_state == TCP_ESTABLISHED && 799 ipv6_addr_equal(daddr, &np->daddr)) 800 daddr = &np->daddr; 801 802 if (addr_len >= sizeof(struct sockaddr_in6) && 803 sin6->sin6_scope_id && 804 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 805 fl6.flowi6_oif = sin6->sin6_scope_id; 806 } else { 807 if (sk->sk_state != TCP_ESTABLISHED) 808 return -EDESTADDRREQ; 809 810 proto = inet->inet_num; 811 daddr = &np->daddr; 812 fl6.flowlabel = np->flow_label; 813 } 814 815 if (fl6.flowi6_oif == 0) 816 fl6.flowi6_oif = sk->sk_bound_dev_if; 817 818 if (msg->msg_controllen) { 819 opt = &opt_space; 820 memset(opt, 0, sizeof(struct ipv6_txoptions)); 821 opt->tot_len = sizeof(struct ipv6_txoptions); 822 823 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, 824 &hlimit, &tclass, &dontfrag); 825 if (err < 0) { 826 fl6_sock_release(flowlabel); 827 return err; 828 } 829 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 830 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 831 if (flowlabel == NULL) 832 return -EINVAL; 833 } 834 if (!(opt->opt_nflen|opt->opt_flen)) 835 opt = NULL; 836 } 837 if (opt == NULL) 838 opt = np->opt; 839 if (flowlabel) 840 opt = fl6_merge_options(&opt_space, flowlabel, opt); 841 opt = ipv6_fixup_options(&opt_space, opt); 842 843 fl6.flowi6_proto = proto; 844 err = rawv6_probe_proto_opt(&fl6, msg); 845 if (err) 846 goto out; 847 848 if (!ipv6_addr_any(daddr)) 849 fl6.daddr = *daddr; 850 else 851 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 852 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 853 fl6.saddr = np->saddr; 854 855 final_p = fl6_update_dst(&fl6, opt, &final); 856 857 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 858 fl6.flowi6_oif = np->mcast_oif; 859 else if (!fl6.flowi6_oif) 860 fl6.flowi6_oif = np->ucast_oif; 861 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 862 863 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true); 864 if (IS_ERR(dst)) { 865 err = PTR_ERR(dst); 866 goto out; 867 } 868 if (hlimit < 0) { 869 if (ipv6_addr_is_multicast(&fl6.daddr)) 870 hlimit = np->mcast_hops; 871 else 872 hlimit = np->hop_limit; 873 if (hlimit < 0) 874 hlimit = ip6_dst_hoplimit(dst); 875 } 876 877 if (tclass < 0) 878 tclass = np->tclass; 879 880 if (dontfrag < 0) 881 dontfrag = np->dontfrag; 882 883 if (msg->msg_flags&MSG_CONFIRM) 884 goto do_confirm; 885 886 back_from_confirm: 887 if (inet->hdrincl) 888 err = rawv6_send_hdrinc(sk, msg->msg_iov, len, &fl6, &dst, msg->msg_flags); 889 else { 890 lock_sock(sk); 891 err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, 892 len, 0, hlimit, tclass, opt, &fl6, (struct rt6_info*)dst, 893 msg->msg_flags, dontfrag); 894 895 if (err) 896 ip6_flush_pending_frames(sk); 897 else if (!(msg->msg_flags & MSG_MORE)) 898 err = rawv6_push_pending_frames(sk, &fl6, rp); 899 release_sock(sk); 900 } 901 done: 902 dst_release(dst); 903 out: 904 fl6_sock_release(flowlabel); 905 return err<0?err:len; 906 do_confirm: 907 dst_confirm(dst); 908 if (!(msg->msg_flags & MSG_PROBE) || len) 909 goto back_from_confirm; 910 err = 0; 911 goto done; 912 } 913 914 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 915 char __user *optval, int optlen) 916 { 917 switch (optname) { 918 case ICMPV6_FILTER: 919 if (optlen > sizeof(struct icmp6_filter)) 920 optlen = sizeof(struct icmp6_filter); 921 if (copy_from_user(&raw6_sk(sk)->filter, optval, optlen)) 922 return -EFAULT; 923 return 0; 924 default: 925 return -ENOPROTOOPT; 926 } 927 928 return 0; 929 } 930 931 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 932 char __user *optval, int __user *optlen) 933 { 934 int len; 935 936 switch (optname) { 937 case ICMPV6_FILTER: 938 if (get_user(len, optlen)) 939 return -EFAULT; 940 if (len < 0) 941 return -EINVAL; 942 if (len > sizeof(struct icmp6_filter)) 943 len = sizeof(struct icmp6_filter); 944 if (put_user(len, optlen)) 945 return -EFAULT; 946 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 947 return -EFAULT; 948 return 0; 949 default: 950 return -ENOPROTOOPT; 951 } 952 953 return 0; 954 } 955 956 957 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 958 char __user *optval, unsigned int optlen) 959 { 960 struct raw6_sock *rp = raw6_sk(sk); 961 int val; 962 963 if (get_user(val, (int __user *)optval)) 964 return -EFAULT; 965 966 switch (optname) { 967 case IPV6_CHECKSUM: 968 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 969 level == IPPROTO_IPV6) { 970 /* 971 * RFC3542 tells that IPV6_CHECKSUM socket 972 * option in the IPPROTO_IPV6 level is not 973 * allowed on ICMPv6 sockets. 974 * If you want to set it, use IPPROTO_RAW 975 * level IPV6_CHECKSUM socket option 976 * (Linux extension). 977 */ 978 return -EINVAL; 979 } 980 981 /* You may get strange result with a positive odd offset; 982 RFC2292bis agrees with me. */ 983 if (val > 0 && (val&1)) 984 return -EINVAL; 985 if (val < 0) { 986 rp->checksum = 0; 987 } else { 988 rp->checksum = 1; 989 rp->offset = val; 990 } 991 992 return 0; 993 994 default: 995 return -ENOPROTOOPT; 996 } 997 } 998 999 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1000 char __user *optval, unsigned int optlen) 1001 { 1002 switch (level) { 1003 case SOL_RAW: 1004 break; 1005 1006 case SOL_ICMPV6: 1007 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1008 return -EOPNOTSUPP; 1009 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1010 case SOL_IPV6: 1011 if (optname == IPV6_CHECKSUM) 1012 break; 1013 default: 1014 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1015 } 1016 1017 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1018 } 1019 1020 #ifdef CONFIG_COMPAT 1021 static int compat_rawv6_setsockopt(struct sock *sk, int level, int optname, 1022 char __user *optval, unsigned int optlen) 1023 { 1024 switch (level) { 1025 case SOL_RAW: 1026 break; 1027 case SOL_ICMPV6: 1028 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1029 return -EOPNOTSUPP; 1030 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1031 case SOL_IPV6: 1032 if (optname == IPV6_CHECKSUM) 1033 break; 1034 default: 1035 return compat_ipv6_setsockopt(sk, level, optname, 1036 optval, optlen); 1037 } 1038 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1039 } 1040 #endif 1041 1042 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1043 char __user *optval, int __user *optlen) 1044 { 1045 struct raw6_sock *rp = raw6_sk(sk); 1046 int val, len; 1047 1048 if (get_user(len,optlen)) 1049 return -EFAULT; 1050 1051 switch (optname) { 1052 case IPV6_CHECKSUM: 1053 /* 1054 * We allow getsockopt() for IPPROTO_IPV6-level 1055 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1056 * since RFC3542 is silent about it. 1057 */ 1058 if (rp->checksum == 0) 1059 val = -1; 1060 else 1061 val = rp->offset; 1062 break; 1063 1064 default: 1065 return -ENOPROTOOPT; 1066 } 1067 1068 len = min_t(unsigned int, sizeof(int), len); 1069 1070 if (put_user(len, optlen)) 1071 return -EFAULT; 1072 if (copy_to_user(optval,&val,len)) 1073 return -EFAULT; 1074 return 0; 1075 } 1076 1077 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1078 char __user *optval, int __user *optlen) 1079 { 1080 switch (level) { 1081 case SOL_RAW: 1082 break; 1083 1084 case SOL_ICMPV6: 1085 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1086 return -EOPNOTSUPP; 1087 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1088 case SOL_IPV6: 1089 if (optname == IPV6_CHECKSUM) 1090 break; 1091 default: 1092 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1093 } 1094 1095 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1096 } 1097 1098 #ifdef CONFIG_COMPAT 1099 static int compat_rawv6_getsockopt(struct sock *sk, int level, int optname, 1100 char __user *optval, int __user *optlen) 1101 { 1102 switch (level) { 1103 case SOL_RAW: 1104 break; 1105 case SOL_ICMPV6: 1106 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1107 return -EOPNOTSUPP; 1108 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1109 case SOL_IPV6: 1110 if (optname == IPV6_CHECKSUM) 1111 break; 1112 default: 1113 return compat_ipv6_getsockopt(sk, level, optname, 1114 optval, optlen); 1115 } 1116 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1117 } 1118 #endif 1119 1120 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1121 { 1122 switch (cmd) { 1123 case SIOCOUTQ: { 1124 int amount = sk_wmem_alloc_get(sk); 1125 1126 return put_user(amount, (int __user *)arg); 1127 } 1128 case SIOCINQ: { 1129 struct sk_buff *skb; 1130 int amount = 0; 1131 1132 spin_lock_bh(&sk->sk_receive_queue.lock); 1133 skb = skb_peek(&sk->sk_receive_queue); 1134 if (skb != NULL) 1135 amount = skb->tail - skb->transport_header; 1136 spin_unlock_bh(&sk->sk_receive_queue.lock); 1137 return put_user(amount, (int __user *)arg); 1138 } 1139 1140 default: 1141 #ifdef CONFIG_IPV6_MROUTE 1142 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1143 #else 1144 return -ENOIOCTLCMD; 1145 #endif 1146 } 1147 } 1148 1149 #ifdef CONFIG_COMPAT 1150 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 1151 { 1152 switch (cmd) { 1153 case SIOCOUTQ: 1154 case SIOCINQ: 1155 return -ENOIOCTLCMD; 1156 default: 1157 #ifdef CONFIG_IPV6_MROUTE 1158 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); 1159 #else 1160 return -ENOIOCTLCMD; 1161 #endif 1162 } 1163 } 1164 #endif 1165 1166 static void rawv6_close(struct sock *sk, long timeout) 1167 { 1168 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1169 ip6_ra_control(sk, -1); 1170 ip6mr_sk_done(sk); 1171 sk_common_release(sk); 1172 } 1173 1174 static void raw6_destroy(struct sock *sk) 1175 { 1176 lock_sock(sk); 1177 ip6_flush_pending_frames(sk); 1178 release_sock(sk); 1179 1180 inet6_destroy_sock(sk); 1181 } 1182 1183 static int rawv6_init_sk(struct sock *sk) 1184 { 1185 struct raw6_sock *rp = raw6_sk(sk); 1186 1187 switch (inet_sk(sk)->inet_num) { 1188 case IPPROTO_ICMPV6: 1189 rp->checksum = 1; 1190 rp->offset = 2; 1191 break; 1192 case IPPROTO_MH: 1193 rp->checksum = 1; 1194 rp->offset = 4; 1195 break; 1196 default: 1197 break; 1198 } 1199 return 0; 1200 } 1201 1202 struct proto rawv6_prot = { 1203 .name = "RAWv6", 1204 .owner = THIS_MODULE, 1205 .close = rawv6_close, 1206 .destroy = raw6_destroy, 1207 .connect = ip6_datagram_connect, 1208 .disconnect = udp_disconnect, 1209 .ioctl = rawv6_ioctl, 1210 .init = rawv6_init_sk, 1211 .setsockopt = rawv6_setsockopt, 1212 .getsockopt = rawv6_getsockopt, 1213 .sendmsg = rawv6_sendmsg, 1214 .recvmsg = rawv6_recvmsg, 1215 .bind = rawv6_bind, 1216 .backlog_rcv = rawv6_rcv_skb, 1217 .hash = raw_hash_sk, 1218 .unhash = raw_unhash_sk, 1219 .obj_size = sizeof(struct raw6_sock), 1220 .h.raw_hash = &raw_v6_hashinfo, 1221 #ifdef CONFIG_COMPAT 1222 .compat_setsockopt = compat_rawv6_setsockopt, 1223 .compat_getsockopt = compat_rawv6_getsockopt, 1224 .compat_ioctl = compat_rawv6_ioctl, 1225 #endif 1226 }; 1227 1228 #ifdef CONFIG_PROC_FS 1229 static void raw6_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1230 { 1231 struct ipv6_pinfo *np = inet6_sk(sp); 1232 const struct in6_addr *dest, *src; 1233 __u16 destp, srcp; 1234 1235 dest = &np->daddr; 1236 src = &np->rcv_saddr; 1237 destp = 0; 1238 srcp = inet_sk(sp)->inet_num; 1239 seq_printf(seq, 1240 "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " 1241 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", 1242 i, 1243 src->s6_addr32[0], src->s6_addr32[1], 1244 src->s6_addr32[2], src->s6_addr32[3], srcp, 1245 dest->s6_addr32[0], dest->s6_addr32[1], 1246 dest->s6_addr32[2], dest->s6_addr32[3], destp, 1247 sp->sk_state, 1248 sk_wmem_alloc_get(sp), 1249 sk_rmem_alloc_get(sp), 1250 0, 0L, 0, 1251 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1252 0, 1253 sock_i_ino(sp), 1254 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1255 } 1256 1257 static int raw6_seq_show(struct seq_file *seq, void *v) 1258 { 1259 if (v == SEQ_START_TOKEN) 1260 seq_printf(seq, 1261 " sl " 1262 "local_address " 1263 "remote_address " 1264 "st tx_queue rx_queue tr tm->when retrnsmt" 1265 " uid timeout inode ref pointer drops\n"); 1266 else 1267 raw6_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1268 return 0; 1269 } 1270 1271 static const struct seq_operations raw6_seq_ops = { 1272 .start = raw_seq_start, 1273 .next = raw_seq_next, 1274 .stop = raw_seq_stop, 1275 .show = raw6_seq_show, 1276 }; 1277 1278 static int raw6_seq_open(struct inode *inode, struct file *file) 1279 { 1280 return raw_seq_open(inode, file, &raw_v6_hashinfo, &raw6_seq_ops); 1281 } 1282 1283 static const struct file_operations raw6_seq_fops = { 1284 .owner = THIS_MODULE, 1285 .open = raw6_seq_open, 1286 .read = seq_read, 1287 .llseek = seq_lseek, 1288 .release = seq_release_net, 1289 }; 1290 1291 static int __net_init raw6_init_net(struct net *net) 1292 { 1293 if (!proc_create("raw6", S_IRUGO, net->proc_net, &raw6_seq_fops)) 1294 return -ENOMEM; 1295 1296 return 0; 1297 } 1298 1299 static void __net_exit raw6_exit_net(struct net *net) 1300 { 1301 remove_proc_entry("raw6", net->proc_net); 1302 } 1303 1304 static struct pernet_operations raw6_net_ops = { 1305 .init = raw6_init_net, 1306 .exit = raw6_exit_net, 1307 }; 1308 1309 int __init raw6_proc_init(void) 1310 { 1311 return register_pernet_subsys(&raw6_net_ops); 1312 } 1313 1314 void raw6_proc_exit(void) 1315 { 1316 unregister_pernet_subsys(&raw6_net_ops); 1317 } 1318 #endif /* CONFIG_PROC_FS */ 1319 1320 /* Same as inet6_dgram_ops, sans udp_poll. */ 1321 static const struct proto_ops inet6_sockraw_ops = { 1322 .family = PF_INET6, 1323 .owner = THIS_MODULE, 1324 .release = inet6_release, 1325 .bind = inet6_bind, 1326 .connect = inet_dgram_connect, /* ok */ 1327 .socketpair = sock_no_socketpair, /* a do nothing */ 1328 .accept = sock_no_accept, /* a do nothing */ 1329 .getname = inet6_getname, 1330 .poll = datagram_poll, /* ok */ 1331 .ioctl = inet6_ioctl, /* must change */ 1332 .listen = sock_no_listen, /* ok */ 1333 .shutdown = inet_shutdown, /* ok */ 1334 .setsockopt = sock_common_setsockopt, /* ok */ 1335 .getsockopt = sock_common_getsockopt, /* ok */ 1336 .sendmsg = inet_sendmsg, /* ok */ 1337 .recvmsg = sock_common_recvmsg, /* ok */ 1338 .mmap = sock_no_mmap, 1339 .sendpage = sock_no_sendpage, 1340 #ifdef CONFIG_COMPAT 1341 .compat_setsockopt = compat_sock_common_setsockopt, 1342 .compat_getsockopt = compat_sock_common_getsockopt, 1343 #endif 1344 }; 1345 1346 static struct inet_protosw rawv6_protosw = { 1347 .type = SOCK_RAW, 1348 .protocol = IPPROTO_IP, /* wild card */ 1349 .prot = &rawv6_prot, 1350 .ops = &inet6_sockraw_ops, 1351 .no_check = UDP_CSUM_DEFAULT, 1352 .flags = INET_PROTOSW_REUSE, 1353 }; 1354 1355 int __init rawv6_init(void) 1356 { 1357 int ret; 1358 1359 ret = inet6_register_protosw(&rawv6_protosw); 1360 if (ret) 1361 goto out; 1362 out: 1363 return ret; 1364 } 1365 1366 void rawv6_exit(void) 1367 { 1368 inet6_unregister_protosw(&rawv6_protosw); 1369 } 1370