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 !ipv6_can_nonlocal_bind(sock_net(sk), inet)) { 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_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 flags |= (noblock ? MSG_DONTWAIT : 0); 481 skb = skb_recv_datagram(sk, flags, &err); 482 if (!skb) 483 goto out; 484 485 copied = skb->len; 486 if (copied > len) { 487 copied = len; 488 msg->msg_flags |= MSG_TRUNC; 489 } 490 491 if (skb_csum_unnecessary(skb)) { 492 err = skb_copy_datagram_msg(skb, 0, msg, copied); 493 } else if (msg->msg_flags&MSG_TRUNC) { 494 if (__skb_checksum_complete(skb)) 495 goto csum_copy_err; 496 err = skb_copy_datagram_msg(skb, 0, msg, copied); 497 } else { 498 err = skb_copy_and_csum_datagram_msg(skb, 0, msg); 499 if (err == -EINVAL) 500 goto csum_copy_err; 501 } 502 if (err) 503 goto out_free; 504 505 /* Copy the address. */ 506 if (sin6) { 507 sin6->sin6_family = AF_INET6; 508 sin6->sin6_port = 0; 509 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 510 sin6->sin6_flowinfo = 0; 511 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, 512 inet6_iif(skb)); 513 *addr_len = sizeof(*sin6); 514 } 515 516 sock_recv_ts_and_drops(msg, sk, skb); 517 518 if (np->rxopt.all) 519 ip6_datagram_recv_ctl(sk, msg, skb); 520 521 err = copied; 522 if (flags & MSG_TRUNC) 523 err = skb->len; 524 525 out_free: 526 skb_free_datagram(sk, skb); 527 out: 528 return err; 529 530 csum_copy_err: 531 skb_kill_datagram(sk, skb, flags); 532 533 /* Error for blocking case is chosen to masquerade 534 as some normal condition. 535 */ 536 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 537 goto out; 538 } 539 540 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 541 struct raw6_sock *rp) 542 { 543 struct sk_buff *skb; 544 int err = 0; 545 int offset; 546 int len; 547 int total_len; 548 __wsum tmp_csum; 549 __sum16 csum; 550 551 if (!rp->checksum) 552 goto send; 553 554 skb = skb_peek(&sk->sk_write_queue); 555 if (!skb) 556 goto out; 557 558 offset = rp->offset; 559 total_len = inet_sk(sk)->cork.base.length; 560 if (offset >= total_len - 1) { 561 err = -EINVAL; 562 ip6_flush_pending_frames(sk); 563 goto out; 564 } 565 566 /* should be check HW csum miyazawa */ 567 if (skb_queue_len(&sk->sk_write_queue) == 1) { 568 /* 569 * Only one fragment on the socket. 570 */ 571 tmp_csum = skb->csum; 572 } else { 573 struct sk_buff *csum_skb = NULL; 574 tmp_csum = 0; 575 576 skb_queue_walk(&sk->sk_write_queue, skb) { 577 tmp_csum = csum_add(tmp_csum, skb->csum); 578 579 if (csum_skb) 580 continue; 581 582 len = skb->len - skb_transport_offset(skb); 583 if (offset >= len) { 584 offset -= len; 585 continue; 586 } 587 588 csum_skb = skb; 589 } 590 591 skb = csum_skb; 592 } 593 594 offset += skb_transport_offset(skb); 595 err = skb_copy_bits(skb, offset, &csum, 2); 596 if (err < 0) { 597 ip6_flush_pending_frames(sk); 598 goto out; 599 } 600 601 /* in case cksum was not initialized */ 602 if (unlikely(csum)) 603 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 604 605 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 606 total_len, fl6->flowi6_proto, tmp_csum); 607 608 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP) 609 csum = CSUM_MANGLED_0; 610 611 BUG_ON(skb_store_bits(skb, offset, &csum, 2)); 612 613 send: 614 err = ip6_push_pending_frames(sk); 615 out: 616 return err; 617 } 618 619 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length, 620 struct flowi6 *fl6, struct dst_entry **dstp, 621 unsigned int flags, const struct sockcm_cookie *sockc) 622 { 623 struct ipv6_pinfo *np = inet6_sk(sk); 624 struct net *net = sock_net(sk); 625 struct ipv6hdr *iph; 626 struct sk_buff *skb; 627 int err; 628 struct rt6_info *rt = (struct rt6_info *)*dstp; 629 int hlen = LL_RESERVED_SPACE(rt->dst.dev); 630 int tlen = rt->dst.dev->needed_tailroom; 631 632 if (length > rt->dst.dev->mtu) { 633 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu); 634 return -EMSGSIZE; 635 } 636 if (length < sizeof(struct ipv6hdr)) 637 return -EINVAL; 638 if (flags&MSG_PROBE) 639 goto out; 640 641 skb = sock_alloc_send_skb(sk, 642 length + hlen + tlen + 15, 643 flags & MSG_DONTWAIT, &err); 644 if (!skb) 645 goto error; 646 skb_reserve(skb, hlen); 647 648 skb->protocol = htons(ETH_P_IPV6); 649 skb->priority = sk->sk_priority; 650 skb->mark = sockc->mark; 651 skb->tstamp = sockc->transmit_time; 652 653 skb_put(skb, length); 654 skb_reset_network_header(skb); 655 iph = ipv6_hdr(skb); 656 657 skb->ip_summed = CHECKSUM_NONE; 658 659 skb_setup_tx_timestamp(skb, sockc->tsflags); 660 661 if (flags & MSG_CONFIRM) 662 skb_set_dst_pending_confirm(skb, 1); 663 664 skb->transport_header = skb->network_header; 665 err = memcpy_from_msg(iph, msg, length); 666 if (err) { 667 err = -EFAULT; 668 kfree_skb(skb); 669 goto error; 670 } 671 672 skb_dst_set(skb, &rt->dst); 673 *dstp = NULL; 674 675 /* if egress device is enslaved to an L3 master device pass the 676 * skb to its handler for processing 677 */ 678 skb = l3mdev_ip6_out(sk, skb); 679 if (unlikely(!skb)) 680 return 0; 681 682 /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev 683 * in the error path. Since skb has been freed, the dst could 684 * have been queued for deletion. 685 */ 686 rcu_read_lock(); 687 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len); 688 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb, 689 NULL, rt->dst.dev, dst_output); 690 if (err > 0) 691 err = net_xmit_errno(err); 692 if (err) { 693 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 694 rcu_read_unlock(); 695 goto error_check; 696 } 697 rcu_read_unlock(); 698 out: 699 return 0; 700 701 error: 702 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 703 error_check: 704 if (err == -ENOBUFS && !np->recverr) 705 err = 0; 706 return err; 707 } 708 709 struct raw6_frag_vec { 710 struct msghdr *msg; 711 int hlen; 712 char c[4]; 713 }; 714 715 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6) 716 { 717 int err = 0; 718 switch (fl6->flowi6_proto) { 719 case IPPROTO_ICMPV6: 720 rfv->hlen = 2; 721 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); 722 if (!err) { 723 fl6->fl6_icmp_type = rfv->c[0]; 724 fl6->fl6_icmp_code = rfv->c[1]; 725 } 726 break; 727 case IPPROTO_MH: 728 rfv->hlen = 4; 729 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); 730 if (!err) 731 fl6->fl6_mh_type = rfv->c[2]; 732 } 733 return err; 734 } 735 736 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd, 737 struct sk_buff *skb) 738 { 739 struct raw6_frag_vec *rfv = from; 740 741 if (offset < rfv->hlen) { 742 int copy = min(rfv->hlen - offset, len); 743 744 if (skb->ip_summed == CHECKSUM_PARTIAL) 745 memcpy(to, rfv->c + offset, copy); 746 else 747 skb->csum = csum_block_add( 748 skb->csum, 749 csum_partial_copy_nocheck(rfv->c + offset, 750 to, copy), 751 odd); 752 753 odd = 0; 754 offset += copy; 755 to += copy; 756 len -= copy; 757 758 if (!len) 759 return 0; 760 } 761 762 offset -= rfv->hlen; 763 764 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 765 } 766 767 static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 768 { 769 struct ipv6_txoptions *opt_to_free = NULL; 770 struct ipv6_txoptions opt_space; 771 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 772 struct in6_addr *daddr, *final_p, final; 773 struct inet_sock *inet = inet_sk(sk); 774 struct ipv6_pinfo *np = inet6_sk(sk); 775 struct raw6_sock *rp = raw6_sk(sk); 776 struct ipv6_txoptions *opt = NULL; 777 struct ip6_flowlabel *flowlabel = NULL; 778 struct dst_entry *dst = NULL; 779 struct raw6_frag_vec rfv; 780 struct flowi6 fl6; 781 struct ipcm6_cookie ipc6; 782 int addr_len = msg->msg_namelen; 783 int hdrincl; 784 u16 proto; 785 int err; 786 787 /* Rough check on arithmetic overflow, 788 better check is made in ip6_append_data(). 789 */ 790 if (len > INT_MAX) 791 return -EMSGSIZE; 792 793 /* Mirror BSD error message compatibility */ 794 if (msg->msg_flags & MSG_OOB) 795 return -EOPNOTSUPP; 796 797 /* hdrincl should be READ_ONCE(inet->hdrincl) 798 * but READ_ONCE() doesn't work with bit fields. 799 * Doing this indirectly yields the same result. 800 */ 801 hdrincl = inet->hdrincl; 802 hdrincl = READ_ONCE(hdrincl); 803 804 /* 805 * Get and verify the address. 806 */ 807 memset(&fl6, 0, sizeof(fl6)); 808 809 fl6.flowi6_mark = sk->sk_mark; 810 fl6.flowi6_uid = sk->sk_uid; 811 812 ipcm6_init(&ipc6); 813 ipc6.sockc.tsflags = sk->sk_tsflags; 814 ipc6.sockc.mark = sk->sk_mark; 815 816 if (sin6) { 817 if (addr_len < SIN6_LEN_RFC2133) 818 return -EINVAL; 819 820 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 821 return -EAFNOSUPPORT; 822 823 /* port is the proto value [0..255] carried in nexthdr */ 824 proto = ntohs(sin6->sin6_port); 825 826 if (!proto) 827 proto = inet->inet_num; 828 else if (proto != inet->inet_num) 829 return -EINVAL; 830 831 if (proto > 255) 832 return -EINVAL; 833 834 daddr = &sin6->sin6_addr; 835 if (np->sndflow) { 836 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 837 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 838 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 839 if (IS_ERR(flowlabel)) 840 return -EINVAL; 841 } 842 } 843 844 /* 845 * Otherwise it will be difficult to maintain 846 * sk->sk_dst_cache. 847 */ 848 if (sk->sk_state == TCP_ESTABLISHED && 849 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 850 daddr = &sk->sk_v6_daddr; 851 852 if (addr_len >= sizeof(struct sockaddr_in6) && 853 sin6->sin6_scope_id && 854 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 855 fl6.flowi6_oif = sin6->sin6_scope_id; 856 } else { 857 if (sk->sk_state != TCP_ESTABLISHED) 858 return -EDESTADDRREQ; 859 860 proto = inet->inet_num; 861 daddr = &sk->sk_v6_daddr; 862 fl6.flowlabel = np->flow_label; 863 } 864 865 if (fl6.flowi6_oif == 0) 866 fl6.flowi6_oif = sk->sk_bound_dev_if; 867 868 if (msg->msg_controllen) { 869 opt = &opt_space; 870 memset(opt, 0, sizeof(struct ipv6_txoptions)); 871 opt->tot_len = sizeof(struct ipv6_txoptions); 872 ipc6.opt = opt; 873 874 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); 875 if (err < 0) { 876 fl6_sock_release(flowlabel); 877 return err; 878 } 879 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 880 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 881 if (IS_ERR(flowlabel)) 882 return -EINVAL; 883 } 884 if (!(opt->opt_nflen|opt->opt_flen)) 885 opt = NULL; 886 } 887 if (!opt) { 888 opt = txopt_get(np); 889 opt_to_free = opt; 890 } 891 if (flowlabel) 892 opt = fl6_merge_options(&opt_space, flowlabel, opt); 893 opt = ipv6_fixup_options(&opt_space, opt); 894 895 fl6.flowi6_proto = proto; 896 fl6.flowi6_mark = ipc6.sockc.mark; 897 898 if (!hdrincl) { 899 rfv.msg = msg; 900 rfv.hlen = 0; 901 err = rawv6_probe_proto_opt(&rfv, &fl6); 902 if (err) 903 goto out; 904 } 905 906 if (!ipv6_addr_any(daddr)) 907 fl6.daddr = *daddr; 908 else 909 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 910 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 911 fl6.saddr = np->saddr; 912 913 final_p = fl6_update_dst(&fl6, opt, &final); 914 915 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 916 fl6.flowi6_oif = np->mcast_oif; 917 else if (!fl6.flowi6_oif) 918 fl6.flowi6_oif = np->ucast_oif; 919 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 920 921 if (hdrincl) 922 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH; 923 924 if (ipc6.tclass < 0) 925 ipc6.tclass = np->tclass; 926 927 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 928 929 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); 930 if (IS_ERR(dst)) { 931 err = PTR_ERR(dst); 932 goto out; 933 } 934 if (ipc6.hlimit < 0) 935 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 936 937 if (ipc6.dontfrag < 0) 938 ipc6.dontfrag = np->dontfrag; 939 940 if (msg->msg_flags&MSG_CONFIRM) 941 goto do_confirm; 942 943 back_from_confirm: 944 if (hdrincl) 945 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, 946 msg->msg_flags, &ipc6.sockc); 947 else { 948 ipc6.opt = opt; 949 lock_sock(sk); 950 err = ip6_append_data(sk, raw6_getfrag, &rfv, 951 len, 0, &ipc6, &fl6, (struct rt6_info *)dst, 952 msg->msg_flags); 953 954 if (err) 955 ip6_flush_pending_frames(sk); 956 else if (!(msg->msg_flags & MSG_MORE)) 957 err = rawv6_push_pending_frames(sk, &fl6, rp); 958 release_sock(sk); 959 } 960 done: 961 dst_release(dst); 962 out: 963 fl6_sock_release(flowlabel); 964 txopt_put(opt_to_free); 965 return err < 0 ? err : len; 966 do_confirm: 967 if (msg->msg_flags & MSG_PROBE) 968 dst_confirm_neigh(dst, &fl6.daddr); 969 if (!(msg->msg_flags & MSG_PROBE) || len) 970 goto back_from_confirm; 971 err = 0; 972 goto done; 973 } 974 975 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname, 976 sockptr_t optval, int optlen) 977 { 978 switch (optname) { 979 case ICMPV6_FILTER: 980 if (optlen > sizeof(struct icmp6_filter)) 981 optlen = sizeof(struct icmp6_filter); 982 if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen)) 983 return -EFAULT; 984 return 0; 985 default: 986 return -ENOPROTOOPT; 987 } 988 989 return 0; 990 } 991 992 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname, 993 char __user *optval, int __user *optlen) 994 { 995 int len; 996 997 switch (optname) { 998 case ICMPV6_FILTER: 999 if (get_user(len, optlen)) 1000 return -EFAULT; 1001 if (len < 0) 1002 return -EINVAL; 1003 if (len > sizeof(struct icmp6_filter)) 1004 len = sizeof(struct icmp6_filter); 1005 if (put_user(len, optlen)) 1006 return -EFAULT; 1007 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 1008 return -EFAULT; 1009 return 0; 1010 default: 1011 return -ENOPROTOOPT; 1012 } 1013 1014 return 0; 1015 } 1016 1017 1018 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 1019 sockptr_t optval, unsigned int optlen) 1020 { 1021 struct raw6_sock *rp = raw6_sk(sk); 1022 int val; 1023 1024 if (optlen < sizeof(val)) 1025 return -EINVAL; 1026 1027 if (copy_from_sockptr(&val, optval, sizeof(val))) 1028 return -EFAULT; 1029 1030 switch (optname) { 1031 case IPV6_HDRINCL: 1032 if (sk->sk_type != SOCK_RAW) 1033 return -EINVAL; 1034 inet_sk(sk)->hdrincl = !!val; 1035 return 0; 1036 case IPV6_CHECKSUM: 1037 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 1038 level == IPPROTO_IPV6) { 1039 /* 1040 * RFC3542 tells that IPV6_CHECKSUM socket 1041 * option in the IPPROTO_IPV6 level is not 1042 * allowed on ICMPv6 sockets. 1043 * If you want to set it, use IPPROTO_RAW 1044 * level IPV6_CHECKSUM socket option 1045 * (Linux extension). 1046 */ 1047 return -EINVAL; 1048 } 1049 1050 /* You may get strange result with a positive odd offset; 1051 RFC2292bis agrees with me. */ 1052 if (val > 0 && (val&1)) 1053 return -EINVAL; 1054 if (val < 0) { 1055 rp->checksum = 0; 1056 } else { 1057 rp->checksum = 1; 1058 rp->offset = val; 1059 } 1060 1061 return 0; 1062 1063 default: 1064 return -ENOPROTOOPT; 1065 } 1066 } 1067 1068 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1069 sockptr_t optval, unsigned int optlen) 1070 { 1071 switch (level) { 1072 case SOL_RAW: 1073 break; 1074 1075 case SOL_ICMPV6: 1076 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1077 return -EOPNOTSUPP; 1078 return rawv6_seticmpfilter(sk, level, optname, optval, optlen); 1079 case SOL_IPV6: 1080 if (optname == IPV6_CHECKSUM || 1081 optname == IPV6_HDRINCL) 1082 break; 1083 fallthrough; 1084 default: 1085 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1086 } 1087 1088 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1089 } 1090 1091 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1092 char __user *optval, int __user *optlen) 1093 { 1094 struct raw6_sock *rp = raw6_sk(sk); 1095 int val, len; 1096 1097 if (get_user(len, optlen)) 1098 return -EFAULT; 1099 1100 switch (optname) { 1101 case IPV6_HDRINCL: 1102 val = inet_sk(sk)->hdrincl; 1103 break; 1104 case IPV6_CHECKSUM: 1105 /* 1106 * We allow getsockopt() for IPPROTO_IPV6-level 1107 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1108 * since RFC3542 is silent about it. 1109 */ 1110 if (rp->checksum == 0) 1111 val = -1; 1112 else 1113 val = rp->offset; 1114 break; 1115 1116 default: 1117 return -ENOPROTOOPT; 1118 } 1119 1120 len = min_t(unsigned int, sizeof(int), len); 1121 1122 if (put_user(len, optlen)) 1123 return -EFAULT; 1124 if (copy_to_user(optval, &val, len)) 1125 return -EFAULT; 1126 return 0; 1127 } 1128 1129 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1130 char __user *optval, int __user *optlen) 1131 { 1132 switch (level) { 1133 case SOL_RAW: 1134 break; 1135 1136 case SOL_ICMPV6: 1137 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1138 return -EOPNOTSUPP; 1139 return rawv6_geticmpfilter(sk, level, optname, optval, optlen); 1140 case SOL_IPV6: 1141 if (optname == IPV6_CHECKSUM || 1142 optname == IPV6_HDRINCL) 1143 break; 1144 fallthrough; 1145 default: 1146 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1147 } 1148 1149 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1150 } 1151 1152 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg) 1153 { 1154 switch (cmd) { 1155 case SIOCOUTQ: { 1156 int amount = sk_wmem_alloc_get(sk); 1157 1158 return put_user(amount, (int __user *)arg); 1159 } 1160 case SIOCINQ: { 1161 struct sk_buff *skb; 1162 int amount = 0; 1163 1164 spin_lock_bh(&sk->sk_receive_queue.lock); 1165 skb = skb_peek(&sk->sk_receive_queue); 1166 if (skb) 1167 amount = skb->len; 1168 spin_unlock_bh(&sk->sk_receive_queue.lock); 1169 return put_user(amount, (int __user *)arg); 1170 } 1171 1172 default: 1173 #ifdef CONFIG_IPV6_MROUTE 1174 return ip6mr_ioctl(sk, cmd, (void __user *)arg); 1175 #else 1176 return -ENOIOCTLCMD; 1177 #endif 1178 } 1179 } 1180 1181 #ifdef CONFIG_COMPAT 1182 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 1183 { 1184 switch (cmd) { 1185 case SIOCOUTQ: 1186 case SIOCINQ: 1187 return -ENOIOCTLCMD; 1188 default: 1189 #ifdef CONFIG_IPV6_MROUTE 1190 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); 1191 #else 1192 return -ENOIOCTLCMD; 1193 #endif 1194 } 1195 } 1196 #endif 1197 1198 static void rawv6_close(struct sock *sk, long timeout) 1199 { 1200 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1201 ip6_ra_control(sk, -1); 1202 ip6mr_sk_done(sk); 1203 sk_common_release(sk); 1204 } 1205 1206 static void raw6_destroy(struct sock *sk) 1207 { 1208 lock_sock(sk); 1209 ip6_flush_pending_frames(sk); 1210 release_sock(sk); 1211 1212 inet6_destroy_sock(sk); 1213 } 1214 1215 static int rawv6_init_sk(struct sock *sk) 1216 { 1217 struct raw6_sock *rp = raw6_sk(sk); 1218 1219 switch (inet_sk(sk)->inet_num) { 1220 case IPPROTO_ICMPV6: 1221 rp->checksum = 1; 1222 rp->offset = 2; 1223 break; 1224 case IPPROTO_MH: 1225 rp->checksum = 1; 1226 rp->offset = 4; 1227 break; 1228 default: 1229 break; 1230 } 1231 return 0; 1232 } 1233 1234 struct proto rawv6_prot = { 1235 .name = "RAWv6", 1236 .owner = THIS_MODULE, 1237 .close = rawv6_close, 1238 .destroy = raw6_destroy, 1239 .connect = ip6_datagram_connect_v6_only, 1240 .disconnect = __udp_disconnect, 1241 .ioctl = rawv6_ioctl, 1242 .init = rawv6_init_sk, 1243 .setsockopt = rawv6_setsockopt, 1244 .getsockopt = rawv6_getsockopt, 1245 .sendmsg = rawv6_sendmsg, 1246 .recvmsg = rawv6_recvmsg, 1247 .bind = rawv6_bind, 1248 .backlog_rcv = rawv6_rcv_skb, 1249 .hash = raw_hash_sk, 1250 .unhash = raw_unhash_sk, 1251 .obj_size = sizeof(struct raw6_sock), 1252 .useroffset = offsetof(struct raw6_sock, filter), 1253 .usersize = sizeof_field(struct raw6_sock, filter), 1254 .h.raw_hash = &raw_v6_hashinfo, 1255 #ifdef CONFIG_COMPAT 1256 .compat_ioctl = compat_rawv6_ioctl, 1257 #endif 1258 .diag_destroy = raw_abort, 1259 }; 1260 1261 #ifdef CONFIG_PROC_FS 1262 static int raw6_seq_show(struct seq_file *seq, void *v) 1263 { 1264 if (v == SEQ_START_TOKEN) { 1265 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1266 } else { 1267 struct sock *sp = v; 1268 __u16 srcp = inet_sk(sp)->inet_num; 1269 ip6_dgram_sock_seq_show(seq, v, srcp, 0, 1270 raw_seq_private(seq)->bucket); 1271 } 1272 return 0; 1273 } 1274 1275 static const struct seq_operations raw6_seq_ops = { 1276 .start = raw_seq_start, 1277 .next = raw_seq_next, 1278 .stop = raw_seq_stop, 1279 .show = raw6_seq_show, 1280 }; 1281 1282 static int __net_init raw6_init_net(struct net *net) 1283 { 1284 if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops, 1285 sizeof(struct raw_iter_state), &raw_v6_hashinfo)) 1286 return -ENOMEM; 1287 1288 return 0; 1289 } 1290 1291 static void __net_exit raw6_exit_net(struct net *net) 1292 { 1293 remove_proc_entry("raw6", net->proc_net); 1294 } 1295 1296 static struct pernet_operations raw6_net_ops = { 1297 .init = raw6_init_net, 1298 .exit = raw6_exit_net, 1299 }; 1300 1301 int __init raw6_proc_init(void) 1302 { 1303 return register_pernet_subsys(&raw6_net_ops); 1304 } 1305 1306 void raw6_proc_exit(void) 1307 { 1308 unregister_pernet_subsys(&raw6_net_ops); 1309 } 1310 #endif /* CONFIG_PROC_FS */ 1311 1312 /* Same as inet6_dgram_ops, sans udp_poll. */ 1313 const struct proto_ops inet6_sockraw_ops = { 1314 .family = PF_INET6, 1315 .owner = THIS_MODULE, 1316 .release = inet6_release, 1317 .bind = inet6_bind, 1318 .connect = inet_dgram_connect, /* ok */ 1319 .socketpair = sock_no_socketpair, /* a do nothing */ 1320 .accept = sock_no_accept, /* a do nothing */ 1321 .getname = inet6_getname, 1322 .poll = datagram_poll, /* ok */ 1323 .ioctl = inet6_ioctl, /* must change */ 1324 .gettstamp = sock_gettstamp, 1325 .listen = sock_no_listen, /* ok */ 1326 .shutdown = inet_shutdown, /* ok */ 1327 .setsockopt = sock_common_setsockopt, /* ok */ 1328 .getsockopt = sock_common_getsockopt, /* ok */ 1329 .sendmsg = inet_sendmsg, /* ok */ 1330 .recvmsg = sock_common_recvmsg, /* ok */ 1331 .mmap = sock_no_mmap, 1332 .sendpage = sock_no_sendpage, 1333 #ifdef CONFIG_COMPAT 1334 .compat_ioctl = inet6_compat_ioctl, 1335 #endif 1336 }; 1337 1338 static struct inet_protosw rawv6_protosw = { 1339 .type = SOCK_RAW, 1340 .protocol = IPPROTO_IP, /* wild card */ 1341 .prot = &rawv6_prot, 1342 .ops = &inet6_sockraw_ops, 1343 .flags = INET_PROTOSW_REUSE, 1344 }; 1345 1346 int __init rawv6_init(void) 1347 { 1348 return inet6_register_protosw(&rawv6_protosw); 1349 } 1350 1351 void rawv6_exit(void) 1352 { 1353 inet6_unregister_protosw(&rawv6_protosw); 1354 } 1355