1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * RAW sockets for IPv6 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * 9 * Adapted from linux/net/ipv4/raw.c 10 * 11 * Fixes: 12 * Hideaki YOSHIFUJI : sin6_scope_id support 13 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance) 14 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data 15 */ 16 17 #include <linux/errno.h> 18 #include <linux/types.h> 19 #include <linux/socket.h> 20 #include <linux/slab.h> 21 #include <linux/sockios.h> 22 #include <linux/net.h> 23 #include <linux/in6.h> 24 #include <linux/netdevice.h> 25 #include <linux/if_arp.h> 26 #include <linux/icmpv6.h> 27 #include <linux/netfilter.h> 28 #include <linux/netfilter_ipv6.h> 29 #include <linux/skbuff.h> 30 #include <linux/compat.h> 31 #include <linux/uaccess.h> 32 #include <asm/ioctls.h> 33 34 #include <net/net_namespace.h> 35 #include <net/ip.h> 36 #include <net/sock.h> 37 #include <net/snmp.h> 38 39 #include <net/ipv6.h> 40 #include <net/ndisc.h> 41 #include <net/protocol.h> 42 #include <net/ip6_route.h> 43 #include <net/ip6_checksum.h> 44 #include <net/addrconf.h> 45 #include <net/transp_v6.h> 46 #include <net/udp.h> 47 #include <net/inet_common.h> 48 #include <net/tcp_states.h> 49 #if IS_ENABLED(CONFIG_IPV6_MIP6) 50 #include <net/mip6.h> 51 #endif 52 #include <linux/mroute6.h> 53 54 #include <net/raw.h> 55 #include <net/rawv6.h> 56 #include <net/xfrm.h> 57 58 #include <linux/proc_fs.h> 59 #include <linux/seq_file.h> 60 #include <linux/export.h> 61 62 #define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */ 63 64 struct raw_hashinfo raw_v6_hashinfo = { 65 .lock = __RW_LOCK_UNLOCKED(raw_v6_hashinfo.lock), 66 }; 67 EXPORT_SYMBOL_GPL(raw_v6_hashinfo); 68 69 struct sock *__raw_v6_lookup(struct net *net, struct sock *sk, 70 unsigned short num, const struct in6_addr *loc_addr, 71 const struct in6_addr *rmt_addr, int dif, int sdif) 72 { 73 bool is_multicast = ipv6_addr_is_multicast(loc_addr); 74 75 sk_for_each_from(sk) 76 if (inet_sk(sk)->inet_num == num) { 77 78 if (!net_eq(sock_net(sk), net)) 79 continue; 80 81 if (!ipv6_addr_any(&sk->sk_v6_daddr) && 82 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) 83 continue; 84 85 if (!raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, 86 dif, sdif)) 87 continue; 88 89 if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { 90 if (ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr)) 91 goto found; 92 if (is_multicast && 93 inet6_mc_check(sk, loc_addr, rmt_addr)) 94 goto found; 95 continue; 96 } 97 goto found; 98 } 99 sk = NULL; 100 found: 101 return sk; 102 } 103 EXPORT_SYMBOL_GPL(__raw_v6_lookup); 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 /* We require only the four bytes of the ICMPv6 header, not any 115 * additional bytes of message body in "struct icmp6hdr". 116 */ 117 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 118 ICMPV6_HDRLEN, &_hdr); 119 if (hdr) { 120 const __u32 *data = &raw6_sk(sk)->filter.data[0]; 121 unsigned int type = hdr->icmp6_type; 122 123 return (data[type >> 5] & (1U << (type & 31))) != 0; 124 } 125 return 1; 126 } 127 128 #if IS_ENABLED(CONFIG_IPV6_MIP6) 129 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb); 130 131 static mh_filter_t __rcu *mh_filter __read_mostly; 132 133 int rawv6_mh_filter_register(mh_filter_t filter) 134 { 135 rcu_assign_pointer(mh_filter, filter); 136 return 0; 137 } 138 EXPORT_SYMBOL(rawv6_mh_filter_register); 139 140 int rawv6_mh_filter_unregister(mh_filter_t filter) 141 { 142 RCU_INIT_POINTER(mh_filter, NULL); 143 synchronize_rcu(); 144 return 0; 145 } 146 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 147 148 #endif 149 150 /* 151 * demultiplex raw sockets. 152 * (should consider queueing the skb in the sock receive_queue 153 * without calling rawv6.c) 154 * 155 * Caller owns SKB so we must make clones. 156 */ 157 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 158 { 159 const struct in6_addr *saddr; 160 const struct in6_addr *daddr; 161 struct sock *sk; 162 bool delivered = false; 163 __u8 hash; 164 struct net *net; 165 166 saddr = &ipv6_hdr(skb)->saddr; 167 daddr = saddr + 1; 168 169 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 170 171 read_lock(&raw_v6_hashinfo.lock); 172 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 173 174 if (!sk) 175 goto out; 176 177 net = dev_net(skb->dev); 178 sk = __raw_v6_lookup(net, sk, nexthdr, daddr, saddr, 179 inet6_iif(skb), inet6_sdif(skb)); 180 181 while (sk) { 182 int filtered; 183 184 delivered = true; 185 switch (nexthdr) { 186 case IPPROTO_ICMPV6: 187 filtered = icmpv6_filter(sk, skb); 188 break; 189 190 #if IS_ENABLED(CONFIG_IPV6_MIP6) 191 case IPPROTO_MH: 192 { 193 /* XXX: To validate MH only once for each packet, 194 * this is placed here. It should be after checking 195 * xfrm policy, however it doesn't. The checking xfrm 196 * policy is placed in rawv6_rcv() because it is 197 * required for each socket. 198 */ 199 mh_filter_t *filter; 200 201 filter = rcu_dereference(mh_filter); 202 filtered = filter ? (*filter)(sk, skb) : 0; 203 break; 204 } 205 #endif 206 default: 207 filtered = 0; 208 break; 209 } 210 211 if (filtered < 0) 212 break; 213 if (filtered == 0) { 214 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 215 216 /* Not releasing hash table! */ 217 if (clone) { 218 nf_reset_ct(clone); 219 rawv6_rcv(sk, clone); 220 } 221 } 222 sk = __raw_v6_lookup(net, sk_next(sk), nexthdr, daddr, saddr, 223 inet6_iif(skb), inet6_sdif(skb)); 224 } 225 out: 226 read_unlock(&raw_v6_hashinfo.lock); 227 return delivered; 228 } 229 230 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr) 231 { 232 struct sock *raw_sk; 233 234 raw_sk = sk_head(&raw_v6_hashinfo.ht[nexthdr & (RAW_HTABLE_SIZE - 1)]); 235 if (raw_sk && !ipv6_raw_deliver(skb, nexthdr)) 236 raw_sk = NULL; 237 238 return raw_sk != NULL; 239 } 240 241 /* This cleans up af_inet6 a bit. -DaveM */ 242 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 243 { 244 struct inet_sock *inet = inet_sk(sk); 245 struct ipv6_pinfo *np = inet6_sk(sk); 246 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 247 __be32 v4addr = 0; 248 int addr_type; 249 int err; 250 251 if (addr_len < SIN6_LEN_RFC2133) 252 return -EINVAL; 253 254 if (addr->sin6_family != AF_INET6) 255 return -EINVAL; 256 257 addr_type = ipv6_addr_type(&addr->sin6_addr); 258 259 /* Raw sockets are IPv6 only */ 260 if (addr_type == IPV6_ADDR_MAPPED) 261 return -EADDRNOTAVAIL; 262 263 lock_sock(sk); 264 265 err = -EINVAL; 266 if (sk->sk_state != TCP_CLOSE) 267 goto out; 268 269 rcu_read_lock(); 270 /* Check if the address belongs to the host. */ 271 if (addr_type != IPV6_ADDR_ANY) { 272 struct net_device *dev = NULL; 273 274 if (__ipv6_addr_needs_scope_id(addr_type)) { 275 if (addr_len >= sizeof(struct sockaddr_in6) && 276 addr->sin6_scope_id) { 277 /* Override any existing binding, if another 278 * one is supplied by user. 279 */ 280 sk->sk_bound_dev_if = addr->sin6_scope_id; 281 } 282 283 /* Binding to link-local address requires an interface */ 284 if (!sk->sk_bound_dev_if) 285 goto out_unlock; 286 } 287 288 if (sk->sk_bound_dev_if) { 289 err = -ENODEV; 290 dev = dev_get_by_index_rcu(sock_net(sk), 291 sk->sk_bound_dev_if); 292 if (!dev) 293 goto out_unlock; 294 } 295 296 /* ipv4 addr of the socket is invalid. Only the 297 * unspecified and mapped address have a v4 equivalent. 298 */ 299 v4addr = LOOPBACK4_IPV6; 300 if (!(addr_type & IPV6_ADDR_MULTICAST) && 301 !sock_net(sk)->ipv6.sysctl.ip_nonlocal_bind) { 302 err = -EADDRNOTAVAIL; 303 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 304 dev, 0)) { 305 goto out_unlock; 306 } 307 } 308 } 309 310 inet->inet_rcv_saddr = inet->inet_saddr = v4addr; 311 sk->sk_v6_rcv_saddr = addr->sin6_addr; 312 if (!(addr_type & IPV6_ADDR_MULTICAST)) 313 np->saddr = addr->sin6_addr; 314 err = 0; 315 out_unlock: 316 rcu_read_unlock(); 317 out: 318 release_sock(sk); 319 return err; 320 } 321 322 static void rawv6_err(struct sock *sk, struct sk_buff *skb, 323 struct inet6_skb_parm *opt, 324 u8 type, u8 code, int offset, __be32 info) 325 { 326 struct inet_sock *inet = inet_sk(sk); 327 struct ipv6_pinfo *np = inet6_sk(sk); 328 int err; 329 int harderr; 330 331 /* Report error on raw socket, if: 332 1. User requested recverr. 333 2. Socket is connected (otherwise the error indication 334 is useless without recverr and error is hard. 335 */ 336 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED) 337 return; 338 339 harderr = icmpv6_err_convert(type, code, &err); 340 if (type == ICMPV6_PKT_TOOBIG) { 341 ip6_sk_update_pmtu(skb, sk, info); 342 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); 343 } 344 if (type == NDISC_REDIRECT) { 345 ip6_sk_redirect(skb, sk); 346 return; 347 } 348 if (np->recverr) { 349 u8 *payload = skb->data; 350 if (!inet->hdrincl) 351 payload += offset; 352 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 353 } 354 355 if (np->recverr || harderr) { 356 sk->sk_err = err; 357 sk->sk_error_report(sk); 358 } 359 } 360 361 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 362 u8 type, u8 code, int inner_offset, __be32 info) 363 { 364 struct sock *sk; 365 int hash; 366 const struct in6_addr *saddr, *daddr; 367 struct net *net; 368 369 hash = nexthdr & (RAW_HTABLE_SIZE - 1); 370 371 read_lock(&raw_v6_hashinfo.lock); 372 sk = sk_head(&raw_v6_hashinfo.ht[hash]); 373 if (sk) { 374 /* Note: ipv6_hdr(skb) != skb->data */ 375 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data; 376 saddr = &ip6h->saddr; 377 daddr = &ip6h->daddr; 378 net = dev_net(skb->dev); 379 380 while ((sk = __raw_v6_lookup(net, sk, nexthdr, saddr, daddr, 381 inet6_iif(skb), inet6_iif(skb)))) { 382 rawv6_err(sk, skb, NULL, type, code, 383 inner_offset, info); 384 sk = sk_next(sk); 385 } 386 } 387 read_unlock(&raw_v6_hashinfo.lock); 388 } 389 390 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb) 391 { 392 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) && 393 skb_checksum_complete(skb)) { 394 atomic_inc(&sk->sk_drops); 395 kfree_skb(skb); 396 return NET_RX_DROP; 397 } 398 399 /* Charge it to the socket. */ 400 skb_dst_drop(skb); 401 if (sock_queue_rcv_skb(sk, skb) < 0) { 402 kfree_skb(skb); 403 return NET_RX_DROP; 404 } 405 406 return 0; 407 } 408 409 /* 410 * This is next to useless... 411 * if we demultiplex in network layer we don't need the extra call 412 * just to queue the skb... 413 * maybe we could have the network decide upon a hint if it 414 * should call raw_rcv for demultiplexing 415 */ 416 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 417 { 418 struct inet_sock *inet = inet_sk(sk); 419 struct raw6_sock *rp = raw6_sk(sk); 420 421 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 422 atomic_inc(&sk->sk_drops); 423 kfree_skb(skb); 424 return NET_RX_DROP; 425 } 426 427 if (!rp->checksum) 428 skb->ip_summed = CHECKSUM_UNNECESSARY; 429 430 if (skb->ip_summed == CHECKSUM_COMPLETE) { 431 skb_postpull_rcsum(skb, skb_network_header(skb), 432 skb_network_header_len(skb)); 433 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 434 &ipv6_hdr(skb)->daddr, 435 skb->len, inet->inet_num, skb->csum)) 436 skb->ip_summed = CHECKSUM_UNNECESSARY; 437 } 438 if (!skb_csum_unnecessary(skb)) 439 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 440 &ipv6_hdr(skb)->daddr, 441 skb->len, 442 inet->inet_num, 0)); 443 444 if (inet->hdrincl) { 445 if (skb_checksum_complete(skb)) { 446 atomic_inc(&sk->sk_drops); 447 kfree_skb(skb); 448 return NET_RX_DROP; 449 } 450 } 451 452 rawv6_rcv_skb(sk, skb); 453 return 0; 454 } 455 456 457 /* 458 * This should be easy, if there is something there 459 * we return it, otherwise we block. 460 */ 461 462 static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 463 int noblock, int flags, int *addr_len) 464 { 465 struct ipv6_pinfo *np = inet6_sk(sk); 466 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 467 struct sk_buff *skb; 468 size_t copied; 469 int err; 470 471 if (flags & MSG_OOB) 472 return -EOPNOTSUPP; 473 474 if (flags & MSG_ERRQUEUE) 475 return ipv6_recv_error(sk, msg, len, addr_len); 476 477 if (np->rxpmtu && np->rxopt.bits.rxpmtu) 478 return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 479 480 skb = skb_recv_datagram(sk, flags, noblock, &err); 481 if (!skb) 482 goto out; 483 484 copied = skb->len; 485 if (copied > len) { 486 copied = len; 487 msg->msg_flags |= MSG_TRUNC; 488 } 489 490 if (skb_csum_unnecessary(skb)) { 491 err = skb_copy_datagram_msg(skb, 0, msg, copied); 492 } else if (msg->msg_flags&MSG_TRUNC) { 493 if (__skb_checksum_complete(skb)) 494 goto csum_copy_err; 495 err = skb_copy_datagram_msg(skb, 0, msg, copied); 496 } else { 497 err = skb_copy_and_csum_datagram_msg(skb, 0, msg); 498 if (err == -EINVAL) 499 goto csum_copy_err; 500 } 501 if (err) 502 goto out_free; 503 504 /* Copy the address. */ 505 if (sin6) { 506 sin6->sin6_family = AF_INET6; 507 sin6->sin6_port = 0; 508 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 509 sin6->sin6_flowinfo = 0; 510 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, 511 inet6_iif(skb)); 512 *addr_len = sizeof(*sin6); 513 } 514 515 sock_recv_ts_and_drops(msg, sk, skb); 516 517 if (np->rxopt.all) 518 ip6_datagram_recv_ctl(sk, msg, skb); 519 520 err = copied; 521 if (flags & MSG_TRUNC) 522 err = skb->len; 523 524 out_free: 525 skb_free_datagram(sk, skb); 526 out: 527 return err; 528 529 csum_copy_err: 530 skb_kill_datagram(sk, skb, flags); 531 532 /* Error for blocking case is chosen to masquerade 533 as some normal condition. 534 */ 535 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 536 goto out; 537 } 538 539 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 540 struct raw6_sock *rp) 541 { 542 struct sk_buff *skb; 543 int err = 0; 544 int offset; 545 int len; 546 int total_len; 547 __wsum tmp_csum; 548 __sum16 csum; 549 550 if (!rp->checksum) 551 goto send; 552 553 skb = skb_peek(&sk->sk_write_queue); 554 if (!skb) 555 goto out; 556 557 offset = rp->offset; 558 total_len = inet_sk(sk)->cork.base.length; 559 if (offset >= total_len - 1) { 560 err = -EINVAL; 561 ip6_flush_pending_frames(sk); 562 goto out; 563 } 564 565 /* should be check HW csum miyazawa */ 566 if (skb_queue_len(&sk->sk_write_queue) == 1) { 567 /* 568 * Only one fragment on the socket. 569 */ 570 tmp_csum = skb->csum; 571 } else { 572 struct sk_buff *csum_skb = NULL; 573 tmp_csum = 0; 574 575 skb_queue_walk(&sk->sk_write_queue, skb) { 576 tmp_csum = csum_add(tmp_csum, skb->csum); 577 578 if (csum_skb) 579 continue; 580 581 len = skb->len - skb_transport_offset(skb); 582 if (offset >= len) { 583 offset -= len; 584 continue; 585 } 586 587 csum_skb = skb; 588 } 589 590 skb = csum_skb; 591 } 592 593 offset += skb_transport_offset(skb); 594 err = skb_copy_bits(skb, offset, &csum, 2); 595 if (err < 0) { 596 ip6_flush_pending_frames(sk); 597 goto out; 598 } 599 600 /* in case cksum was not initialized */ 601 if (unlikely(csum)) 602 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 603 604 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 605 total_len, fl6->flowi6_proto, tmp_csum); 606 607 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP) 608 csum = CSUM_MANGLED_0; 609 610 BUG_ON(skb_store_bits(skb, offset, &csum, 2)); 611 612 send: 613 err = ip6_push_pending_frames(sk); 614 out: 615 return err; 616 } 617 618 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length, 619 struct flowi6 *fl6, struct dst_entry **dstp, 620 unsigned int flags, const struct sockcm_cookie *sockc) 621 { 622 struct ipv6_pinfo *np = inet6_sk(sk); 623 struct net *net = sock_net(sk); 624 struct ipv6hdr *iph; 625 struct sk_buff *skb; 626 int err; 627 struct rt6_info *rt = (struct rt6_info *)*dstp; 628 int hlen = LL_RESERVED_SPACE(rt->dst.dev); 629 int tlen = rt->dst.dev->needed_tailroom; 630 631 if (length > rt->dst.dev->mtu) { 632 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu); 633 return -EMSGSIZE; 634 } 635 if (length < sizeof(struct ipv6hdr)) 636 return -EINVAL; 637 if (flags&MSG_PROBE) 638 goto out; 639 640 skb = sock_alloc_send_skb(sk, 641 length + hlen + tlen + 15, 642 flags & MSG_DONTWAIT, &err); 643 if (!skb) 644 goto error; 645 skb_reserve(skb, hlen); 646 647 skb->protocol = htons(ETH_P_IPV6); 648 skb->priority = sk->sk_priority; 649 skb->mark = sockc->mark; 650 skb->tstamp = sockc->transmit_time; 651 652 skb_put(skb, length); 653 skb_reset_network_header(skb); 654 iph = ipv6_hdr(skb); 655 656 skb->ip_summed = CHECKSUM_NONE; 657 658 skb_setup_tx_timestamp(skb, sockc->tsflags); 659 660 if (flags & MSG_CONFIRM) 661 skb_set_dst_pending_confirm(skb, 1); 662 663 skb->transport_header = skb->network_header; 664 err = memcpy_from_msg(iph, msg, length); 665 if (err) { 666 err = -EFAULT; 667 kfree_skb(skb); 668 goto error; 669 } 670 671 skb_dst_set(skb, &rt->dst); 672 *dstp = NULL; 673 674 /* if egress device is enslaved to an L3 master device pass the 675 * skb to its handler for processing 676 */ 677 skb = l3mdev_ip6_out(sk, skb); 678 if (unlikely(!skb)) 679 return 0; 680 681 /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev 682 * in the error path. Since skb has been freed, the dst could 683 * have been queued for deletion. 684 */ 685 rcu_read_lock(); 686 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); 687 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb, 688 NULL, rt->dst.dev, dst_output); 689 if (err > 0) 690 err = net_xmit_errno(err); 691 if (err) { 692 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 693 rcu_read_unlock(); 694 goto error_check; 695 } 696 rcu_read_unlock(); 697 out: 698 return 0; 699 700 error: 701 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 702 error_check: 703 if (err == -ENOBUFS && !np->recverr) 704 err = 0; 705 return err; 706 } 707 708 struct raw6_frag_vec { 709 struct msghdr *msg; 710 int hlen; 711 char c[4]; 712 }; 713 714 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6) 715 { 716 int err = 0; 717 switch (fl6->flowi6_proto) { 718 case IPPROTO_ICMPV6: 719 rfv->hlen = 2; 720 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); 721 if (!err) { 722 fl6->fl6_icmp_type = rfv->c[0]; 723 fl6->fl6_icmp_code = rfv->c[1]; 724 } 725 break; 726 case IPPROTO_MH: 727 rfv->hlen = 4; 728 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); 729 if (!err) 730 fl6->fl6_mh_type = rfv->c[2]; 731 } 732 return err; 733 } 734 735 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd, 736 struct sk_buff *skb) 737 { 738 struct raw6_frag_vec *rfv = from; 739 740 if (offset < rfv->hlen) { 741 int copy = min(rfv->hlen - offset, len); 742 743 if (skb->ip_summed == CHECKSUM_PARTIAL) 744 memcpy(to, rfv->c + offset, copy); 745 else 746 skb->csum = csum_block_add( 747 skb->csum, 748 csum_partial_copy_nocheck(rfv->c + offset, 749 to, copy), 750 odd); 751 752 odd = 0; 753 offset += copy; 754 to += copy; 755 len -= copy; 756 757 if (!len) 758 return 0; 759 } 760 761 offset -= rfv->hlen; 762 763 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 764 } 765 766 static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 767 { 768 struct ipv6_txoptions *opt_to_free = NULL; 769 struct ipv6_txoptions opt_space; 770 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 771 struct in6_addr *daddr, *final_p, final; 772 struct inet_sock *inet = inet_sk(sk); 773 struct ipv6_pinfo *np = inet6_sk(sk); 774 struct raw6_sock *rp = raw6_sk(sk); 775 struct ipv6_txoptions *opt = NULL; 776 struct ip6_flowlabel *flowlabel = NULL; 777 struct dst_entry *dst = NULL; 778 struct raw6_frag_vec rfv; 779 struct flowi6 fl6; 780 struct ipcm6_cookie ipc6; 781 int addr_len = msg->msg_namelen; 782 int hdrincl; 783 u16 proto; 784 int err; 785 786 /* Rough check on arithmetic overflow, 787 better check is made in ip6_append_data(). 788 */ 789 if (len > INT_MAX) 790 return -EMSGSIZE; 791 792 /* Mirror BSD error message compatibility */ 793 if (msg->msg_flags & MSG_OOB) 794 return -EOPNOTSUPP; 795 796 /* hdrincl should be READ_ONCE(inet->hdrincl) 797 * but READ_ONCE() doesn't work with bit fields. 798 * Doing this indirectly yields the same result. 799 */ 800 hdrincl = inet->hdrincl; 801 hdrincl = READ_ONCE(hdrincl); 802 803 /* 804 * Get and verify the address. 805 */ 806 memset(&fl6, 0, sizeof(fl6)); 807 808 fl6.flowi6_mark = sk->sk_mark; 809 fl6.flowi6_uid = sk->sk_uid; 810 811 ipcm6_init(&ipc6); 812 ipc6.sockc.tsflags = sk->sk_tsflags; 813 ipc6.sockc.mark = sk->sk_mark; 814 815 if (sin6) { 816 if (addr_len < SIN6_LEN_RFC2133) 817 return -EINVAL; 818 819 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 820 return -EAFNOSUPPORT; 821 822 /* port is the proto value [0..255] carried in nexthdr */ 823 proto = ntohs(sin6->sin6_port); 824 825 if (!proto) 826 proto = inet->inet_num; 827 else if (proto != inet->inet_num) 828 return -EINVAL; 829 830 if (proto > 255) 831 return -EINVAL; 832 833 daddr = &sin6->sin6_addr; 834 if (np->sndflow) { 835 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 836 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 837 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 838 if (IS_ERR(flowlabel)) 839 return -EINVAL; 840 } 841 } 842 843 /* 844 * Otherwise it will be difficult to maintain 845 * sk->sk_dst_cache. 846 */ 847 if (sk->sk_state == TCP_ESTABLISHED && 848 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 849 daddr = &sk->sk_v6_daddr; 850 851 if (addr_len >= sizeof(struct sockaddr_in6) && 852 sin6->sin6_scope_id && 853 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 854 fl6.flowi6_oif = sin6->sin6_scope_id; 855 } else { 856 if (sk->sk_state != TCP_ESTABLISHED) 857 return -EDESTADDRREQ; 858 859 proto = inet->inet_num; 860 daddr = &sk->sk_v6_daddr; 861 fl6.flowlabel = np->flow_label; 862 } 863 864 if (fl6.flowi6_oif == 0) 865 fl6.flowi6_oif = sk->sk_bound_dev_if; 866 867 if (msg->msg_controllen) { 868 opt = &opt_space; 869 memset(opt, 0, sizeof(struct ipv6_txoptions)); 870 opt->tot_len = sizeof(struct ipv6_txoptions); 871 ipc6.opt = opt; 872 873 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); 874 if (err < 0) { 875 fl6_sock_release(flowlabel); 876 return err; 877 } 878 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 879 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 880 if (IS_ERR(flowlabel)) 881 return -EINVAL; 882 } 883 if (!(opt->opt_nflen|opt->opt_flen)) 884 opt = NULL; 885 } 886 if (!opt) { 887 opt = txopt_get(np); 888 opt_to_free = opt; 889 } 890 if (flowlabel) 891 opt = fl6_merge_options(&opt_space, flowlabel, opt); 892 opt = ipv6_fixup_options(&opt_space, opt); 893 894 fl6.flowi6_proto = proto; 895 fl6.flowi6_mark = ipc6.sockc.mark; 896 897 if (!hdrincl) { 898 rfv.msg = msg; 899 rfv.hlen = 0; 900 err = rawv6_probe_proto_opt(&rfv, &fl6); 901 if (err) 902 goto out; 903 } 904 905 if (!ipv6_addr_any(daddr)) 906 fl6.daddr = *daddr; 907 else 908 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 909 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 910 fl6.saddr = np->saddr; 911 912 final_p = fl6_update_dst(&fl6, opt, &final); 913 914 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 915 fl6.flowi6_oif = np->mcast_oif; 916 else if (!fl6.flowi6_oif) 917 fl6.flowi6_oif = np->ucast_oif; 918 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); 919 920 if (hdrincl) 921 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH; 922 923 if (ipc6.tclass < 0) 924 ipc6.tclass = np->tclass; 925 926 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 927 928 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); 929 if (IS_ERR(dst)) { 930 err = PTR_ERR(dst); 931 goto out; 932 } 933 if (ipc6.hlimit < 0) 934 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 935 936 if (ipc6.dontfrag < 0) 937 ipc6.dontfrag = np->dontfrag; 938 939 if (msg->msg_flags&MSG_CONFIRM) 940 goto do_confirm; 941 942 back_from_confirm: 943 if (hdrincl) 944 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, 945 msg->msg_flags, &ipc6.sockc); 946 else { 947 ipc6.opt = opt; 948 lock_sock(sk); 949 err = ip6_append_data(sk, raw6_getfrag, &rfv, 950 len, 0, &ipc6, &fl6, (struct rt6_info *)dst, 951 msg->msg_flags); 952 953 if (err) 954 ip6_flush_pending_frames(sk); 955 else if (!(msg->msg_flags & MSG_MORE)) 956 err = rawv6_push_pending_frames(sk, &fl6, rp); 957 release_sock(sk); 958 } 959 done: 960 dst_release(dst); 961 out: 962 fl6_sock_release(flowlabel); 963 txopt_put(opt_to_free); 964 return err < 0 ? err : len; 965 do_confirm: 966 if (msg->msg_flags & MSG_PROBE) 967 dst_confirm_neigh(dst, &fl6.daddr); 968 if (!(msg->msg_flags & MSG_PROBE) || len) 969 goto back_from_confirm; 970 err = 0; 971 goto done; 972 } 973 974 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 975 sockptr_t optval, int optlen) 976 { 977 switch (optname) { 978 case ICMPV6_FILTER: 979 if (optlen > sizeof(struct icmp6_filter)) 980 optlen = sizeof(struct icmp6_filter); 981 if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen)) 982 return -EFAULT; 983 return 0; 984 default: 985 return -ENOPROTOOPT; 986 } 987 988 return 0; 989 } 990 991 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 992 char __user *optval, int __user *optlen) 993 { 994 int len; 995 996 switch (optname) { 997 case ICMPV6_FILTER: 998 if (get_user(len, optlen)) 999 return -EFAULT; 1000 if (len < 0) 1001 return -EINVAL; 1002 if (len > sizeof(struct icmp6_filter)) 1003 len = sizeof(struct icmp6_filter); 1004 if (put_user(len, optlen)) 1005 return -EFAULT; 1006 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 1007 return -EFAULT; 1008 return 0; 1009 default: 1010 return -ENOPROTOOPT; 1011 } 1012 1013 return 0; 1014 } 1015 1016 1017 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 1018 sockptr_t optval, unsigned int optlen) 1019 { 1020 struct raw6_sock *rp = raw6_sk(sk); 1021 int val; 1022 1023 if (copy_from_sockptr(&val, optval, sizeof(val))) 1024 return -EFAULT; 1025 1026 switch (optname) { 1027 case IPV6_HDRINCL: 1028 if (sk->sk_type != SOCK_RAW) 1029 return -EINVAL; 1030 inet_sk(sk)->hdrincl = !!val; 1031 return 0; 1032 case IPV6_CHECKSUM: 1033 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 1034 level == IPPROTO_IPV6) { 1035 /* 1036 * RFC3542 tells that IPV6_CHECKSUM socket 1037 * option in the IPPROTO_IPV6 level is not 1038 * allowed on ICMPv6 sockets. 1039 * If you want to set it, use IPPROTO_RAW 1040 * level IPV6_CHECKSUM socket option 1041 * (Linux extension). 1042 */ 1043 return -EINVAL; 1044 } 1045 1046 /* You may get strange result with a positive odd offset; 1047 RFC2292bis agrees with me. */ 1048 if (val > 0 && (val&1)) 1049 return -EINVAL; 1050 if (val < 0) { 1051 rp->checksum = 0; 1052 } else { 1053 rp->checksum = 1; 1054 rp->offset = val; 1055 } 1056 1057 return 0; 1058 1059 default: 1060 return -ENOPROTOOPT; 1061 } 1062 } 1063 1064 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1065 sockptr_t optval, unsigned int optlen) 1066 { 1067 switch (level) { 1068 case SOL_RAW: 1069 break; 1070 1071 case SOL_ICMPV6: 1072 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1073 return -EOPNOTSUPP; 1074 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1075 case SOL_IPV6: 1076 if (optname == IPV6_CHECKSUM || 1077 optname == IPV6_HDRINCL) 1078 break; 1079 fallthrough; 1080 default: 1081 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1082 } 1083 1084 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1085 } 1086 1087 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1088 char __user *optval, int __user *optlen) 1089 { 1090 struct raw6_sock *rp = raw6_sk(sk); 1091 int val, len; 1092 1093 if (get_user(len, optlen)) 1094 return -EFAULT; 1095 1096 switch (optname) { 1097 case IPV6_HDRINCL: 1098 val = inet_sk(sk)->hdrincl; 1099 break; 1100 case IPV6_CHECKSUM: 1101 /* 1102 * We allow getsockopt() for IPPROTO_IPV6-level 1103 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1104 * since RFC3542 is silent about it. 1105 */ 1106 if (rp->checksum == 0) 1107 val = -1; 1108 else 1109 val = rp->offset; 1110 break; 1111 1112 default: 1113 return -ENOPROTOOPT; 1114 } 1115 1116 len = min_t(unsigned int, sizeof(int), len); 1117 1118 if (put_user(len, optlen)) 1119 return -EFAULT; 1120 if (copy_to_user(optval, &val, len)) 1121 return -EFAULT; 1122 return 0; 1123 } 1124 1125 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1126 char __user *optval, int __user *optlen) 1127 { 1128 switch (level) { 1129 case SOL_RAW: 1130 break; 1131 1132 case SOL_ICMPV6: 1133 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1134 return -EOPNOTSUPP; 1135 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1136 case SOL_IPV6: 1137 if (optname == IPV6_CHECKSUM || 1138 optname == IPV6_HDRINCL) 1139 break; 1140 fallthrough; 1141 default: 1142 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1143 } 1144 1145 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1146 } 1147 1148 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1149 { 1150 switch (cmd) { 1151 case SIOCOUTQ: { 1152 int amount = sk_wmem_alloc_get(sk); 1153 1154 return put_user(amount, (int __user *)arg); 1155 } 1156 case SIOCINQ: { 1157 struct sk_buff *skb; 1158 int amount = 0; 1159 1160 spin_lock_bh(&sk->sk_receive_queue.lock); 1161 skb = skb_peek(&sk->sk_receive_queue); 1162 if (skb) 1163 amount = skb->len; 1164 spin_unlock_bh(&sk->sk_receive_queue.lock); 1165 return put_user(amount, (int __user *)arg); 1166 } 1167 1168 default: 1169 #ifdef CONFIG_IPV6_MROUTE 1170 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1171 #else 1172 return -ENOIOCTLCMD; 1173 #endif 1174 } 1175 } 1176 1177 #ifdef CONFIG_COMPAT 1178 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 1179 { 1180 switch (cmd) { 1181 case SIOCOUTQ: 1182 case SIOCINQ: 1183 return -ENOIOCTLCMD; 1184 default: 1185 #ifdef CONFIG_IPV6_MROUTE 1186 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); 1187 #else 1188 return -ENOIOCTLCMD; 1189 #endif 1190 } 1191 } 1192 #endif 1193 1194 static void rawv6_close(struct sock *sk, long timeout) 1195 { 1196 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1197 ip6_ra_control(sk, -1); 1198 ip6mr_sk_done(sk); 1199 sk_common_release(sk); 1200 } 1201 1202 static void raw6_destroy(struct sock *sk) 1203 { 1204 lock_sock(sk); 1205 ip6_flush_pending_frames(sk); 1206 release_sock(sk); 1207 1208 inet6_destroy_sock(sk); 1209 } 1210 1211 static int rawv6_init_sk(struct sock *sk) 1212 { 1213 struct raw6_sock *rp = raw6_sk(sk); 1214 1215 switch (inet_sk(sk)->inet_num) { 1216 case IPPROTO_ICMPV6: 1217 rp->checksum = 1; 1218 rp->offset = 2; 1219 break; 1220 case IPPROTO_MH: 1221 rp->checksum = 1; 1222 rp->offset = 4; 1223 break; 1224 default: 1225 break; 1226 } 1227 return 0; 1228 } 1229 1230 struct proto rawv6_prot = { 1231 .name = "RAWv6", 1232 .owner = THIS_MODULE, 1233 .close = rawv6_close, 1234 .destroy = raw6_destroy, 1235 .connect = ip6_datagram_connect_v6_only, 1236 .disconnect = __udp_disconnect, 1237 .ioctl = rawv6_ioctl, 1238 .init = rawv6_init_sk, 1239 .setsockopt = rawv6_setsockopt, 1240 .getsockopt = rawv6_getsockopt, 1241 .sendmsg = rawv6_sendmsg, 1242 .recvmsg = rawv6_recvmsg, 1243 .bind = rawv6_bind, 1244 .backlog_rcv = rawv6_rcv_skb, 1245 .hash = raw_hash_sk, 1246 .unhash = raw_unhash_sk, 1247 .obj_size = sizeof(struct raw6_sock), 1248 .useroffset = offsetof(struct raw6_sock, filter), 1249 .usersize = sizeof_field(struct raw6_sock, filter), 1250 .h.raw_hash = &raw_v6_hashinfo, 1251 #ifdef CONFIG_COMPAT 1252 .compat_ioctl = compat_rawv6_ioctl, 1253 #endif 1254 .diag_destroy = raw_abort, 1255 }; 1256 1257 #ifdef CONFIG_PROC_FS 1258 static int raw6_seq_show(struct seq_file *seq, void *v) 1259 { 1260 if (v == SEQ_START_TOKEN) { 1261 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1262 } else { 1263 struct sock *sp = v; 1264 __u16 srcp = inet_sk(sp)->inet_num; 1265 ip6_dgram_sock_seq_show(seq, v, srcp, 0, 1266 raw_seq_private(seq)->bucket); 1267 } 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 __net_init raw6_init_net(struct net *net) 1279 { 1280 if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops, 1281 sizeof(struct raw_iter_state), &raw_v6_hashinfo)) 1282 return -ENOMEM; 1283 1284 return 0; 1285 } 1286 1287 static void __net_exit raw6_exit_net(struct net *net) 1288 { 1289 remove_proc_entry("raw6", net->proc_net); 1290 } 1291 1292 static struct pernet_operations raw6_net_ops = { 1293 .init = raw6_init_net, 1294 .exit = raw6_exit_net, 1295 }; 1296 1297 int __init raw6_proc_init(void) 1298 { 1299 return register_pernet_subsys(&raw6_net_ops); 1300 } 1301 1302 void raw6_proc_exit(void) 1303 { 1304 unregister_pernet_subsys(&raw6_net_ops); 1305 } 1306 #endif /* CONFIG_PROC_FS */ 1307 1308 /* Same as inet6_dgram_ops, sans udp_poll. */ 1309 const struct proto_ops inet6_sockraw_ops = { 1310 .family = PF_INET6, 1311 .owner = THIS_MODULE, 1312 .release = inet6_release, 1313 .bind = inet6_bind, 1314 .connect = inet_dgram_connect, /* ok */ 1315 .socketpair = sock_no_socketpair, /* a do nothing */ 1316 .accept = sock_no_accept, /* a do nothing */ 1317 .getname = inet6_getname, 1318 .poll = datagram_poll, /* ok */ 1319 .ioctl = inet6_ioctl, /* must change */ 1320 .gettstamp = sock_gettstamp, 1321 .listen = sock_no_listen, /* ok */ 1322 .shutdown = inet_shutdown, /* ok */ 1323 .setsockopt = sock_common_setsockopt, /* ok */ 1324 .getsockopt = sock_common_getsockopt, /* ok */ 1325 .sendmsg = inet_sendmsg, /* ok */ 1326 .recvmsg = sock_common_recvmsg, /* ok */ 1327 .mmap = sock_no_mmap, 1328 .sendpage = sock_no_sendpage, 1329 #ifdef CONFIG_COMPAT 1330 .compat_ioctl = inet6_compat_ioctl, 1331 #endif 1332 }; 1333 1334 static struct inet_protosw rawv6_protosw = { 1335 .type = SOCK_RAW, 1336 .protocol = IPPROTO_IP, /* wild card */ 1337 .prot = &rawv6_prot, 1338 .ops = &inet6_sockraw_ops, 1339 .flags = INET_PROTOSW_REUSE, 1340 }; 1341 1342 int __init rawv6_init(void) 1343 { 1344 return inet6_register_protosw(&rawv6_protosw); 1345 } 1346 1347 void rawv6_exit(void) 1348 { 1349 inet6_unregister_protosw(&rawv6_protosw); 1350 } 1351