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 EXPORT_SYMBOL_GPL(raw_v6_hashinfo); 66 67 bool raw_v6_match(struct net *net, const struct sock *sk, unsigned short num, 68 const struct in6_addr *loc_addr, 69 const struct in6_addr *rmt_addr, int dif, int sdif) 70 { 71 if (inet_sk(sk)->inet_num != num || 72 !net_eq(sock_net(sk), net) || 73 (!ipv6_addr_any(&sk->sk_v6_daddr) && 74 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || 75 !raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, 76 dif, sdif)) 77 return false; 78 79 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || 80 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr) || 81 (ipv6_addr_is_multicast(loc_addr) && 82 inet6_mc_check(sk, loc_addr, rmt_addr))) 83 return true; 84 85 return false; 86 } 87 EXPORT_SYMBOL_GPL(raw_v6_match); 88 89 /* 90 * 0 - deliver 91 * 1 - block 92 */ 93 static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb) 94 { 95 struct icmp6hdr _hdr; 96 const struct icmp6hdr *hdr; 97 98 /* We require only the four bytes of the ICMPv6 header, not any 99 * additional bytes of message body in "struct icmp6hdr". 100 */ 101 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 102 ICMPV6_HDRLEN, &_hdr); 103 if (hdr) { 104 const __u32 *data = &raw6_sk(sk)->filter.data[0]; 105 unsigned int type = hdr->icmp6_type; 106 107 return (data[type >> 5] & (1U << (type & 31))) != 0; 108 } 109 return 1; 110 } 111 112 #if IS_ENABLED(CONFIG_IPV6_MIP6) 113 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb); 114 115 static mh_filter_t __rcu *mh_filter __read_mostly; 116 117 int rawv6_mh_filter_register(mh_filter_t filter) 118 { 119 rcu_assign_pointer(mh_filter, filter); 120 return 0; 121 } 122 EXPORT_SYMBOL(rawv6_mh_filter_register); 123 124 int rawv6_mh_filter_unregister(mh_filter_t filter) 125 { 126 RCU_INIT_POINTER(mh_filter, NULL); 127 synchronize_rcu(); 128 return 0; 129 } 130 EXPORT_SYMBOL(rawv6_mh_filter_unregister); 131 132 #endif 133 134 /* 135 * demultiplex raw sockets. 136 * (should consider queueing the skb in the sock receive_queue 137 * without calling rawv6.c) 138 * 139 * Caller owns SKB so we must make clones. 140 */ 141 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr) 142 { 143 struct net *net = dev_net(skb->dev); 144 const struct in6_addr *saddr; 145 const struct in6_addr *daddr; 146 struct hlist_head *hlist; 147 struct sock *sk; 148 bool delivered = false; 149 __u8 hash; 150 151 saddr = &ipv6_hdr(skb)->saddr; 152 daddr = saddr + 1; 153 154 hash = raw_hashfunc(net, nexthdr); 155 hlist = &raw_v6_hashinfo.ht[hash]; 156 rcu_read_lock(); 157 sk_for_each_rcu(sk, hlist) { 158 int filtered; 159 160 if (!raw_v6_match(net, sk, nexthdr, daddr, saddr, 161 inet6_iif(skb), inet6_sdif(skb))) 162 continue; 163 164 if (atomic_read(&sk->sk_rmem_alloc) >= 165 READ_ONCE(sk->sk_rcvbuf)) { 166 sk_drops_inc(sk); 167 continue; 168 } 169 170 delivered = true; 171 switch (nexthdr) { 172 case IPPROTO_ICMPV6: 173 filtered = icmpv6_filter(sk, skb); 174 break; 175 176 #if IS_ENABLED(CONFIG_IPV6_MIP6) 177 case IPPROTO_MH: 178 { 179 /* XXX: To validate MH only once for each packet, 180 * this is placed here. It should be after checking 181 * xfrm policy, however it doesn't. The checking xfrm 182 * policy is placed in rawv6_rcv() because it is 183 * required for each socket. 184 */ 185 mh_filter_t *filter; 186 187 filter = rcu_dereference(mh_filter); 188 filtered = filter ? (*filter)(sk, skb) : 0; 189 break; 190 } 191 #endif 192 default: 193 filtered = 0; 194 break; 195 } 196 197 if (filtered < 0) 198 break; 199 if (filtered == 0) { 200 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 201 202 /* Not releasing hash table! */ 203 if (clone) 204 rawv6_rcv(sk, clone); 205 } 206 } 207 rcu_read_unlock(); 208 return delivered; 209 } 210 211 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr) 212 { 213 return ipv6_raw_deliver(skb, nexthdr); 214 } 215 216 /* This cleans up af_inet6 a bit. -DaveM */ 217 static int rawv6_bind(struct sock *sk, struct sockaddr_unsized *uaddr, 218 int addr_len) 219 { 220 struct inet_sock *inet = inet_sk(sk); 221 struct ipv6_pinfo *np = inet6_sk(sk); 222 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; 223 __be32 v4addr = 0; 224 int addr_type; 225 int err; 226 227 if (addr_len < SIN6_LEN_RFC2133) 228 return -EINVAL; 229 230 if (addr->sin6_family != AF_INET6) 231 return -EINVAL; 232 233 addr_type = ipv6_addr_type(&addr->sin6_addr); 234 235 /* Raw sockets are IPv6 only */ 236 if (addr_type == IPV6_ADDR_MAPPED) 237 return -EADDRNOTAVAIL; 238 239 lock_sock(sk); 240 241 err = -EINVAL; 242 if (sk->sk_state != TCP_CLOSE) 243 goto out; 244 245 rcu_read_lock(); 246 /* Check if the address belongs to the host. */ 247 if (addr_type != IPV6_ADDR_ANY) { 248 struct net_device *dev = NULL; 249 250 if (__ipv6_addr_needs_scope_id(addr_type)) { 251 if (addr_len >= sizeof(struct sockaddr_in6) && 252 addr->sin6_scope_id) { 253 /* Override any existing binding, if another 254 * one is supplied by user. 255 */ 256 sk->sk_bound_dev_if = addr->sin6_scope_id; 257 } 258 259 /* Binding to link-local address requires an interface */ 260 if (!sk->sk_bound_dev_if) 261 goto out_unlock; 262 } 263 264 if (sk->sk_bound_dev_if) { 265 err = -ENODEV; 266 dev = dev_get_by_index_rcu(sock_net(sk), 267 sk->sk_bound_dev_if); 268 if (!dev) 269 goto out_unlock; 270 } 271 272 /* ipv4 addr of the socket is invalid. Only the 273 * unspecified and mapped address have a v4 equivalent. 274 */ 275 v4addr = LOOPBACK4_IPV6; 276 if (!(addr_type & IPV6_ADDR_MULTICAST) && 277 !ipv6_can_nonlocal_bind(sock_net(sk), inet)) { 278 err = -EADDRNOTAVAIL; 279 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr, 280 dev, 0)) { 281 goto out_unlock; 282 } 283 } 284 } 285 286 inet->inet_rcv_saddr = inet->inet_saddr = v4addr; 287 sk->sk_v6_rcv_saddr = addr->sin6_addr; 288 if (!(addr_type & IPV6_ADDR_MULTICAST)) 289 np->saddr = addr->sin6_addr; 290 err = 0; 291 out_unlock: 292 rcu_read_unlock(); 293 out: 294 release_sock(sk); 295 return err; 296 } 297 298 static void rawv6_err(struct sock *sk, struct sk_buff *skb, 299 u8 type, u8 code, int offset, __be32 info) 300 { 301 bool recverr = inet6_test_bit(RECVERR6, sk); 302 struct ipv6_pinfo *np = inet6_sk(sk); 303 int err; 304 int harderr; 305 306 /* Report error on raw socket, if: 307 1. User requested recverr. 308 2. Socket is connected (otherwise the error indication 309 is useless without recverr and error is hard. 310 */ 311 if (!recverr && sk->sk_state != TCP_ESTABLISHED) 312 return; 313 314 harderr = icmpv6_err_convert(type, code, &err); 315 if (type == ICMPV6_PKT_TOOBIG) { 316 ip6_sk_update_pmtu(skb, sk, info); 317 harderr = (READ_ONCE(np->pmtudisc) == IPV6_PMTUDISC_DO); 318 } 319 if (type == NDISC_REDIRECT) { 320 ip6_sk_redirect(skb, sk); 321 return; 322 } 323 if (recverr) { 324 u8 *payload = skb->data; 325 if (!inet_test_bit(HDRINCL, sk)) 326 payload += offset; 327 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload); 328 } 329 330 if (recverr || harderr) { 331 sk->sk_err = err; 332 sk_error_report(sk); 333 } 334 } 335 336 void raw6_icmp_error(struct sk_buff *skb, int nexthdr, 337 u8 type, u8 code, int inner_offset, __be32 info) 338 { 339 struct net *net = dev_net(skb->dev); 340 struct hlist_head *hlist; 341 struct sock *sk; 342 int hash; 343 344 hash = raw_hashfunc(net, nexthdr); 345 hlist = &raw_v6_hashinfo.ht[hash]; 346 rcu_read_lock(); 347 sk_for_each_rcu(sk, hlist) { 348 /* Note: ipv6_hdr(skb) != skb->data */ 349 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data; 350 351 if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr, 352 inet6_iif(skb), inet6_iif(skb))) 353 continue; 354 rawv6_err(sk, skb, type, code, inner_offset, info); 355 } 356 rcu_read_unlock(); 357 } 358 359 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb) 360 { 361 enum skb_drop_reason reason; 362 363 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) && 364 skb_checksum_complete(skb)) { 365 sk_drops_inc(sk); 366 sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_SKB_CSUM); 367 return NET_RX_DROP; 368 } 369 370 /* Charge it to the socket. */ 371 skb_dst_drop(skb); 372 if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) { 373 sk_skb_reason_drop(sk, skb, reason); 374 return NET_RX_DROP; 375 } 376 377 return 0; 378 } 379 380 /* 381 * This is next to useless... 382 * if we demultiplex in network layer we don't need the extra call 383 * just to queue the skb... 384 * maybe we could have the network decide upon a hint if it 385 * should call raw_rcv for demultiplexing 386 */ 387 int rawv6_rcv(struct sock *sk, struct sk_buff *skb) 388 { 389 struct inet_sock *inet = inet_sk(sk); 390 struct raw6_sock *rp = raw6_sk(sk); 391 392 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { 393 sk_drops_inc(sk); 394 sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_XFRM_POLICY); 395 return NET_RX_DROP; 396 } 397 nf_reset_ct(skb); 398 399 if (!rp->checksum) 400 skb->ip_summed = CHECKSUM_UNNECESSARY; 401 402 if (skb->ip_summed == CHECKSUM_COMPLETE) { 403 skb_postpull_rcsum(skb, skb_network_header(skb), 404 skb_network_header_len(skb)); 405 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 406 &ipv6_hdr(skb)->daddr, 407 skb->len, inet->inet_num, skb->csum)) 408 skb->ip_summed = CHECKSUM_UNNECESSARY; 409 } 410 if (!skb_csum_unnecessary(skb)) 411 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, 412 &ipv6_hdr(skb)->daddr, 413 skb->len, 414 inet->inet_num, 0)); 415 416 if (inet_test_bit(HDRINCL, sk)) { 417 if (skb_checksum_complete(skb)) { 418 sk_drops_inc(sk); 419 sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_SKB_CSUM); 420 return NET_RX_DROP; 421 } 422 } 423 424 rawv6_rcv_skb(sk, skb); 425 return 0; 426 } 427 428 429 /* 430 * This should be easy, if there is something there 431 * we return it, otherwise we block. 432 */ 433 434 static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 435 int flags, int *addr_len) 436 { 437 struct ipv6_pinfo *np = inet6_sk(sk); 438 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 439 struct sk_buff *skb; 440 size_t copied; 441 int err; 442 443 if (flags & MSG_OOB) 444 return -EOPNOTSUPP; 445 446 if (flags & MSG_ERRQUEUE) 447 return ipv6_recv_error(sk, msg, len, addr_len); 448 449 if (np->rxopt.bits.rxpmtu && READ_ONCE(np->rxpmtu)) 450 return ipv6_recv_rxpmtu(sk, msg, len, addr_len); 451 452 skb = skb_recv_datagram(sk, flags, &err); 453 if (!skb) 454 goto out; 455 456 copied = skb->len; 457 if (copied > len) { 458 copied = len; 459 msg->msg_flags |= MSG_TRUNC; 460 } 461 462 if (skb_csum_unnecessary(skb)) { 463 err = skb_copy_datagram_msg(skb, 0, msg, copied); 464 } else if (msg->msg_flags&MSG_TRUNC) { 465 if (__skb_checksum_complete(skb)) 466 goto csum_copy_err; 467 err = skb_copy_datagram_msg(skb, 0, msg, copied); 468 } else { 469 err = skb_copy_and_csum_datagram_msg(skb, 0, msg); 470 if (err == -EINVAL) 471 goto csum_copy_err; 472 } 473 if (err) 474 goto out_free; 475 476 /* Copy the address. */ 477 if (sin6) { 478 sin6->sin6_family = AF_INET6; 479 sin6->sin6_port = 0; 480 sin6->sin6_addr = ipv6_hdr(skb)->saddr; 481 sin6->sin6_flowinfo = 0; 482 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, 483 inet6_iif(skb)); 484 *addr_len = sizeof(*sin6); 485 } 486 487 sock_recv_cmsgs(msg, sk, skb); 488 489 if (np->rxopt.all) 490 ip6_datagram_recv_ctl(sk, msg, skb); 491 492 err = copied; 493 if (flags & MSG_TRUNC) 494 err = skb->len; 495 496 out_free: 497 skb_free_datagram(sk, skb); 498 out: 499 return err; 500 501 csum_copy_err: 502 skb_kill_datagram(sk, skb, flags); 503 504 /* Error for blocking case is chosen to masquerade 505 as some normal condition. 506 */ 507 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH; 508 goto out; 509 } 510 511 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6, 512 struct raw6_sock *rp) 513 { 514 struct ipv6_txoptions *opt; 515 struct sk_buff *skb; 516 int err = 0; 517 int offset; 518 int len; 519 int total_len; 520 __wsum tmp_csum; 521 __sum16 csum; 522 523 if (!rp->checksum) 524 goto send; 525 526 skb = skb_peek(&sk->sk_write_queue); 527 if (!skb) 528 goto out; 529 530 offset = rp->offset; 531 total_len = inet_sk(sk)->cork.base.length; 532 opt = inet6_sk(sk)->cork.opt; 533 total_len -= opt ? opt->opt_flen : 0; 534 535 if (offset >= total_len - 1) { 536 err = -EINVAL; 537 ip6_flush_pending_frames(sk); 538 goto out; 539 } 540 541 /* should be check HW csum miyazawa */ 542 if (skb_queue_len(&sk->sk_write_queue) == 1) { 543 /* 544 * Only one fragment on the socket. 545 */ 546 tmp_csum = skb->csum; 547 } else { 548 struct sk_buff *csum_skb = NULL; 549 tmp_csum = 0; 550 551 skb_queue_walk(&sk->sk_write_queue, skb) { 552 tmp_csum = csum_add(tmp_csum, skb->csum); 553 554 if (csum_skb) 555 continue; 556 557 len = skb->len - skb_transport_offset(skb); 558 if (offset >= len) { 559 offset -= len; 560 continue; 561 } 562 563 csum_skb = skb; 564 } 565 566 skb = csum_skb; 567 } 568 569 offset += skb_transport_offset(skb); 570 err = skb_copy_bits(skb, offset, &csum, 2); 571 if (err < 0) { 572 ip6_flush_pending_frames(sk); 573 goto out; 574 } 575 576 /* in case cksum was not initialized */ 577 if (unlikely(csum)) 578 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum)); 579 580 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, 581 total_len, fl6->flowi6_proto, tmp_csum); 582 583 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP) 584 csum = CSUM_MANGLED_0; 585 586 BUG_ON(skb_store_bits(skb, offset, &csum, 2)); 587 588 send: 589 err = ip6_push_pending_frames(sk); 590 out: 591 return err; 592 } 593 594 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length, 595 struct flowi6 *fl6, struct dst_entry **dstp, 596 unsigned int flags, const struct sockcm_cookie *sockc) 597 { 598 struct net *net = sock_net(sk); 599 struct ipv6hdr *iph; 600 struct sk_buff *skb; 601 int err; 602 struct rt6_info *rt = dst_rt6_info(*dstp); 603 int hlen = LL_RESERVED_SPACE(rt->dst.dev); 604 int tlen = rt->dst.dev->needed_tailroom; 605 606 if (length > rt->dst.dev->mtu) { 607 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu); 608 return -EMSGSIZE; 609 } 610 if (length < sizeof(struct ipv6hdr)) 611 return -EINVAL; 612 if (flags&MSG_PROBE) 613 goto out; 614 615 skb = sock_alloc_send_skb(sk, 616 length + hlen + tlen + 15, 617 flags & MSG_DONTWAIT, &err); 618 if (!skb) 619 goto error; 620 skb_reserve(skb, hlen); 621 622 skb->protocol = htons(ETH_P_IPV6); 623 skb->priority = sockc->priority; 624 skb->mark = sockc->mark; 625 skb_set_delivery_type_by_clockid(skb, sockc->transmit_time, sk->sk_clockid); 626 627 skb_put(skb, length); 628 skb_reset_network_header(skb); 629 iph = ipv6_hdr(skb); 630 631 skb->ip_summed = CHECKSUM_NONE; 632 633 skb_setup_tx_timestamp(skb, sockc); 634 635 if (flags & MSG_CONFIRM) 636 skb_set_dst_pending_confirm(skb, 1); 637 638 skb->transport_header = skb->network_header; 639 err = memcpy_from_msg(iph, msg, length); 640 if (err) { 641 err = -EFAULT; 642 kfree_skb(skb); 643 goto error; 644 } 645 646 skb_dst_set(skb, &rt->dst); 647 *dstp = NULL; 648 649 /* if egress device is enslaved to an L3 master device pass the 650 * skb to its handler for processing 651 */ 652 skb = l3mdev_ip6_out(sk, skb); 653 if (unlikely(!skb)) 654 return 0; 655 656 /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev 657 * in the error path. Since skb has been freed, the dst could 658 * have been queued for deletion. 659 */ 660 rcu_read_lock(); 661 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); 662 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb, 663 NULL, rt->dst.dev, dst_output); 664 if (err > 0) 665 err = net_xmit_errno(err); 666 if (err) { 667 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 668 rcu_read_unlock(); 669 goto error_check; 670 } 671 rcu_read_unlock(); 672 out: 673 return 0; 674 675 error: 676 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 677 error_check: 678 if (err == -ENOBUFS && !inet6_test_bit(RECVERR6, sk)) 679 err = 0; 680 return err; 681 } 682 683 struct raw6_frag_vec { 684 struct msghdr *msg; 685 int hlen; 686 char c[4]; 687 }; 688 689 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6) 690 { 691 int err = 0; 692 switch (fl6->flowi6_proto) { 693 case IPPROTO_ICMPV6: 694 rfv->hlen = 2; 695 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); 696 if (!err) { 697 fl6->fl6_icmp_type = rfv->c[0]; 698 fl6->fl6_icmp_code = rfv->c[1]; 699 } 700 break; 701 case IPPROTO_MH: 702 rfv->hlen = 4; 703 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen); 704 if (!err) 705 fl6->fl6_mh_type = rfv->c[2]; 706 } 707 return err; 708 } 709 710 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd, 711 struct sk_buff *skb) 712 { 713 struct raw6_frag_vec *rfv = from; 714 715 if (offset < rfv->hlen) { 716 int copy = min(rfv->hlen - offset, len); 717 718 if (skb->ip_summed == CHECKSUM_PARTIAL) 719 memcpy(to, rfv->c + offset, copy); 720 else 721 skb->csum = csum_block_add( 722 skb->csum, 723 csum_partial_copy_nocheck(rfv->c + offset, 724 to, copy), 725 odd); 726 727 odd = 0; 728 offset += copy; 729 to += copy; 730 len -= copy; 731 732 if (!len) 733 return 0; 734 } 735 736 offset -= rfv->hlen; 737 738 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 739 } 740 741 static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 742 { 743 struct ipv6_txoptions *opt_to_free = NULL; 744 struct ipv6_txoptions opt_space; 745 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); 746 struct in6_addr *daddr, *final_p, final; 747 struct inet_sock *inet = inet_sk(sk); 748 struct ipv6_pinfo *np = inet6_sk(sk); 749 struct raw6_sock *rp = raw6_sk(sk); 750 struct ipv6_txoptions *opt = NULL; 751 struct ip6_flowlabel *flowlabel = NULL; 752 struct dst_entry *dst = NULL; 753 struct raw6_frag_vec rfv; 754 struct flowi6 fl6; 755 struct ipcm6_cookie ipc6; 756 int addr_len = msg->msg_namelen; 757 int hdrincl; 758 u16 proto; 759 int err; 760 761 /* Rough check on arithmetic overflow, 762 better check is made in ip6_append_data(). 763 */ 764 if (len > INT_MAX) 765 return -EMSGSIZE; 766 767 /* Mirror BSD error message compatibility */ 768 if (msg->msg_flags & MSG_OOB) 769 return -EOPNOTSUPP; 770 771 hdrincl = inet_test_bit(HDRINCL, sk); 772 773 ipcm6_init_sk(&ipc6, sk); 774 775 /* 776 * Get and verify the address. 777 */ 778 memset(&fl6, 0, sizeof(fl6)); 779 780 fl6.flowi6_mark = ipc6.sockc.mark; 781 fl6.flowi6_uid = sk_uid(sk); 782 783 if (sin6) { 784 if (addr_len < SIN6_LEN_RFC2133) 785 return -EINVAL; 786 787 if (sin6->sin6_family && sin6->sin6_family != AF_INET6) 788 return -EAFNOSUPPORT; 789 790 /* port is the proto value [0..255] carried in nexthdr */ 791 proto = ntohs(sin6->sin6_port); 792 793 if (!proto) 794 proto = inet->inet_num; 795 else if (proto != inet->inet_num && 796 inet->inet_num != IPPROTO_RAW) 797 return -EINVAL; 798 799 if (proto > 255) 800 return -EINVAL; 801 802 daddr = &sin6->sin6_addr; 803 if (inet6_test_bit(SNDFLOW, sk)) { 804 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; 805 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { 806 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 807 if (IS_ERR(flowlabel)) 808 return -EINVAL; 809 } 810 } 811 812 /* 813 * Otherwise it will be difficult to maintain 814 * sk->sk_dst_cache. 815 */ 816 if (sk->sk_state == TCP_ESTABLISHED && 817 ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) 818 daddr = &sk->sk_v6_daddr; 819 820 if (addr_len >= sizeof(struct sockaddr_in6) && 821 sin6->sin6_scope_id && 822 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) 823 fl6.flowi6_oif = sin6->sin6_scope_id; 824 } else { 825 if (sk->sk_state != TCP_ESTABLISHED) 826 return -EDESTADDRREQ; 827 828 proto = inet->inet_num; 829 daddr = &sk->sk_v6_daddr; 830 fl6.flowlabel = np->flow_label; 831 } 832 833 if (fl6.flowi6_oif == 0) 834 fl6.flowi6_oif = sk->sk_bound_dev_if; 835 836 if (msg->msg_controllen) { 837 opt = &opt_space; 838 memset(opt, 0, sizeof(struct ipv6_txoptions)); 839 opt->tot_len = sizeof(struct ipv6_txoptions); 840 ipc6.opt = opt; 841 842 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6); 843 if (err < 0) { 844 fl6_sock_release(flowlabel); 845 return err; 846 } 847 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { 848 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); 849 if (IS_ERR(flowlabel)) 850 return -EINVAL; 851 } 852 if (!(opt->opt_nflen|opt->opt_flen)) 853 opt = NULL; 854 } 855 if (!opt) { 856 opt = txopt_get(np); 857 opt_to_free = opt; 858 } 859 if (flowlabel) 860 opt = fl6_merge_options(&opt_space, flowlabel, opt); 861 opt = ipv6_fixup_options(&opt_space, opt); 862 863 fl6.flowi6_proto = proto; 864 fl6.flowi6_mark = ipc6.sockc.mark; 865 866 if (!hdrincl) { 867 rfv.msg = msg; 868 rfv.hlen = 0; 869 err = rawv6_probe_proto_opt(&rfv, &fl6); 870 if (err) 871 goto out; 872 } 873 874 if (!ipv6_addr_any(daddr)) 875 fl6.daddr = *daddr; 876 else 877 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ 878 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) 879 fl6.saddr = np->saddr; 880 881 final_p = fl6_update_dst(&fl6, opt, &final); 882 883 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) 884 fl6.flowi6_oif = READ_ONCE(np->mcast_oif); 885 else if (!fl6.flowi6_oif) 886 fl6.flowi6_oif = READ_ONCE(np->ucast_oif); 887 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6)); 888 889 if (hdrincl) 890 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH; 891 892 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); 893 894 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); 895 if (IS_ERR(dst)) { 896 err = PTR_ERR(dst); 897 goto out; 898 } 899 if (ipc6.hlimit < 0) 900 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); 901 902 if (msg->msg_flags&MSG_CONFIRM) 903 goto do_confirm; 904 905 back_from_confirm: 906 if (hdrincl) 907 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst, 908 msg->msg_flags, &ipc6.sockc); 909 else { 910 ipc6.opt = opt; 911 lock_sock(sk); 912 err = ip6_append_data(sk, raw6_getfrag, &rfv, 913 len, 0, &ipc6, &fl6, dst_rt6_info(dst), 914 msg->msg_flags); 915 916 if (err) 917 ip6_flush_pending_frames(sk); 918 else if (!(msg->msg_flags & MSG_MORE)) 919 err = rawv6_push_pending_frames(sk, &fl6, rp); 920 release_sock(sk); 921 } 922 done: 923 dst_release(dst); 924 out: 925 fl6_sock_release(flowlabel); 926 txopt_put(opt_to_free); 927 return err < 0 ? err : len; 928 do_confirm: 929 if (msg->msg_flags & MSG_PROBE) 930 dst_confirm_neigh(dst, &fl6.daddr); 931 if (!(msg->msg_flags & MSG_PROBE) || len) 932 goto back_from_confirm; 933 err = 0; 934 goto done; 935 } 936 937 static int rawv6_seticmpfilter(struct sock *sk, int optname, 938 sockptr_t optval, int optlen) 939 { 940 switch (optname) { 941 case ICMPV6_FILTER: 942 if (optlen > sizeof(struct icmp6_filter)) 943 optlen = sizeof(struct icmp6_filter); 944 if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen)) 945 return -EFAULT; 946 return 0; 947 default: 948 return -ENOPROTOOPT; 949 } 950 951 return 0; 952 } 953 954 static int rawv6_geticmpfilter(struct sock *sk, int optname, 955 char __user *optval, int __user *optlen) 956 { 957 int len; 958 959 switch (optname) { 960 case ICMPV6_FILTER: 961 if (get_user(len, optlen)) 962 return -EFAULT; 963 if (len < 0) 964 return -EINVAL; 965 if (len > sizeof(struct icmp6_filter)) 966 len = sizeof(struct icmp6_filter); 967 if (put_user(len, optlen)) 968 return -EFAULT; 969 if (copy_to_user(optval, &raw6_sk(sk)->filter, len)) 970 return -EFAULT; 971 return 0; 972 default: 973 return -ENOPROTOOPT; 974 } 975 976 return 0; 977 } 978 979 980 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname, 981 sockptr_t optval, unsigned int optlen) 982 { 983 struct raw6_sock *rp = raw6_sk(sk); 984 int val; 985 986 if (optlen < sizeof(val)) 987 return -EINVAL; 988 989 if (copy_from_sockptr(&val, optval, sizeof(val))) 990 return -EFAULT; 991 992 switch (optname) { 993 case IPV6_HDRINCL: 994 if (sk->sk_type != SOCK_RAW) 995 return -EINVAL; 996 inet_assign_bit(HDRINCL, sk, val); 997 return 0; 998 case IPV6_CHECKSUM: 999 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 && 1000 level == IPPROTO_IPV6) { 1001 /* 1002 * RFC3542 tells that IPV6_CHECKSUM socket 1003 * option in the IPPROTO_IPV6 level is not 1004 * allowed on ICMPv6 sockets. 1005 * If you want to set it, use IPPROTO_RAW 1006 * level IPV6_CHECKSUM socket option 1007 * (Linux extension). 1008 */ 1009 return -EINVAL; 1010 } 1011 1012 /* You may get strange result with a positive odd offset; 1013 RFC2292bis agrees with me. */ 1014 if (val > 0 && (val&1)) 1015 return -EINVAL; 1016 if (val < 0) { 1017 rp->checksum = 0; 1018 } else { 1019 rp->checksum = 1; 1020 rp->offset = val; 1021 } 1022 1023 return 0; 1024 1025 default: 1026 return -ENOPROTOOPT; 1027 } 1028 } 1029 1030 static int rawv6_setsockopt(struct sock *sk, int level, int optname, 1031 sockptr_t optval, unsigned int optlen) 1032 { 1033 switch (level) { 1034 case SOL_RAW: 1035 break; 1036 1037 case SOL_ICMPV6: 1038 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1039 return -EOPNOTSUPP; 1040 return rawv6_seticmpfilter(sk, optname, optval, optlen); 1041 case SOL_IPV6: 1042 if (optname == IPV6_CHECKSUM || 1043 optname == IPV6_HDRINCL) 1044 break; 1045 fallthrough; 1046 default: 1047 return ipv6_setsockopt(sk, level, optname, optval, optlen); 1048 } 1049 1050 return do_rawv6_setsockopt(sk, level, optname, optval, optlen); 1051 } 1052 1053 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname, 1054 char __user *optval, int __user *optlen) 1055 { 1056 struct raw6_sock *rp = raw6_sk(sk); 1057 int val, len; 1058 1059 if (get_user(len, optlen)) 1060 return -EFAULT; 1061 1062 switch (optname) { 1063 case IPV6_HDRINCL: 1064 val = inet_test_bit(HDRINCL, sk); 1065 break; 1066 case IPV6_CHECKSUM: 1067 /* 1068 * We allow getsockopt() for IPPROTO_IPV6-level 1069 * IPV6_CHECKSUM socket option on ICMPv6 sockets 1070 * since RFC3542 is silent about it. 1071 */ 1072 if (rp->checksum == 0) 1073 val = -1; 1074 else 1075 val = rp->offset; 1076 break; 1077 1078 default: 1079 return -ENOPROTOOPT; 1080 } 1081 1082 len = min_t(unsigned int, sizeof(int), len); 1083 1084 if (put_user(len, optlen)) 1085 return -EFAULT; 1086 if (copy_to_user(optval, &val, len)) 1087 return -EFAULT; 1088 return 0; 1089 } 1090 1091 static int rawv6_getsockopt(struct sock *sk, int level, int optname, 1092 char __user *optval, int __user *optlen) 1093 { 1094 switch (level) { 1095 case SOL_RAW: 1096 break; 1097 1098 case SOL_ICMPV6: 1099 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6) 1100 return -EOPNOTSUPP; 1101 return rawv6_geticmpfilter(sk, optname, optval, optlen); 1102 case SOL_IPV6: 1103 if (optname == IPV6_CHECKSUM || 1104 optname == IPV6_HDRINCL) 1105 break; 1106 fallthrough; 1107 default: 1108 return ipv6_getsockopt(sk, level, optname, optval, optlen); 1109 } 1110 1111 return do_rawv6_getsockopt(sk, level, optname, optval, optlen); 1112 } 1113 1114 static int rawv6_ioctl(struct sock *sk, int cmd, int *karg) 1115 { 1116 switch (cmd) { 1117 case SIOCOUTQ: { 1118 *karg = sk_wmem_alloc_get(sk); 1119 return 0; 1120 } 1121 case SIOCINQ: { 1122 struct sk_buff *skb; 1123 1124 spin_lock_bh(&sk->sk_receive_queue.lock); 1125 skb = skb_peek(&sk->sk_receive_queue); 1126 if (skb) 1127 *karg = skb->len; 1128 else 1129 *karg = 0; 1130 spin_unlock_bh(&sk->sk_receive_queue.lock); 1131 return 0; 1132 } 1133 1134 default: 1135 #ifdef CONFIG_IPV6_MROUTE 1136 return ip6mr_ioctl(sk, cmd, karg); 1137 #else 1138 return -ENOIOCTLCMD; 1139 #endif 1140 } 1141 } 1142 1143 #ifdef CONFIG_COMPAT 1144 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 1145 { 1146 switch (cmd) { 1147 case SIOCOUTQ: 1148 case SIOCINQ: 1149 return -ENOIOCTLCMD; 1150 default: 1151 #ifdef CONFIG_IPV6_MROUTE 1152 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg)); 1153 #else 1154 return -ENOIOCTLCMD; 1155 #endif 1156 } 1157 } 1158 #endif 1159 1160 static void rawv6_close(struct sock *sk, long timeout) 1161 { 1162 if (inet_sk(sk)->inet_num == IPPROTO_RAW) 1163 ip6_ra_control(sk, -1); 1164 ip6mr_sk_done(sk); 1165 sk_common_release(sk); 1166 } 1167 1168 static void raw6_destroy(struct sock *sk) 1169 { 1170 lock_sock(sk); 1171 ip6_flush_pending_frames(sk); 1172 release_sock(sk); 1173 } 1174 1175 static int rawv6_init_sk(struct sock *sk) 1176 { 1177 struct raw6_sock *rp = raw6_sk(sk); 1178 1179 sk->sk_drop_counters = &rp->drop_counters; 1180 switch (inet_sk(sk)->inet_num) { 1181 case IPPROTO_ICMPV6: 1182 rp->checksum = 1; 1183 rp->offset = 2; 1184 break; 1185 case IPPROTO_MH: 1186 rp->checksum = 1; 1187 rp->offset = 4; 1188 break; 1189 default: 1190 break; 1191 } 1192 return 0; 1193 } 1194 1195 struct proto rawv6_prot = { 1196 .name = "RAWv6", 1197 .owner = THIS_MODULE, 1198 .close = rawv6_close, 1199 .destroy = raw6_destroy, 1200 .connect = ip6_datagram_connect_v6_only, 1201 .disconnect = __udp_disconnect, 1202 .ioctl = rawv6_ioctl, 1203 .init = rawv6_init_sk, 1204 .setsockopt = rawv6_setsockopt, 1205 .getsockopt = rawv6_getsockopt, 1206 .sendmsg = rawv6_sendmsg, 1207 .recvmsg = rawv6_recvmsg, 1208 .bind = rawv6_bind, 1209 .backlog_rcv = rawv6_rcv_skb, 1210 .hash = raw_hash_sk, 1211 .unhash = raw_unhash_sk, 1212 .obj_size = sizeof(struct raw6_sock), 1213 .ipv6_pinfo_offset = offsetof(struct raw6_sock, inet6), 1214 .useroffset = offsetof(struct raw6_sock, filter), 1215 .usersize = sizeof_field(struct raw6_sock, filter), 1216 .h.raw_hash = &raw_v6_hashinfo, 1217 #ifdef CONFIG_COMPAT 1218 .compat_ioctl = compat_rawv6_ioctl, 1219 #endif 1220 .diag_destroy = raw_abort, 1221 }; 1222 1223 #ifdef CONFIG_PROC_FS 1224 static int raw6_seq_show(struct seq_file *seq, void *v) 1225 { 1226 if (v == SEQ_START_TOKEN) { 1227 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); 1228 } else { 1229 struct sock *sp = v; 1230 __u16 srcp = inet_sk(sp)->inet_num; 1231 ip6_dgram_sock_seq_show(seq, v, srcp, 0, 1232 raw_seq_private(seq)->bucket); 1233 } 1234 return 0; 1235 } 1236 1237 static const struct seq_operations raw6_seq_ops = { 1238 .start = raw_seq_start, 1239 .next = raw_seq_next, 1240 .stop = raw_seq_stop, 1241 .show = raw6_seq_show, 1242 }; 1243 1244 static int __net_init raw6_init_net(struct net *net) 1245 { 1246 if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops, 1247 sizeof(struct raw_iter_state), &raw_v6_hashinfo)) 1248 return -ENOMEM; 1249 1250 return 0; 1251 } 1252 1253 static void __net_exit raw6_exit_net(struct net *net) 1254 { 1255 remove_proc_entry("raw6", net->proc_net); 1256 } 1257 1258 static struct pernet_operations raw6_net_ops = { 1259 .init = raw6_init_net, 1260 .exit = raw6_exit_net, 1261 }; 1262 1263 int __init raw6_proc_init(void) 1264 { 1265 return register_pernet_subsys(&raw6_net_ops); 1266 } 1267 1268 void raw6_proc_exit(void) 1269 { 1270 unregister_pernet_subsys(&raw6_net_ops); 1271 } 1272 #endif /* CONFIG_PROC_FS */ 1273 1274 /* Same as inet6_dgram_ops, sans udp_poll. */ 1275 const struct proto_ops inet6_sockraw_ops = { 1276 .family = PF_INET6, 1277 .owner = THIS_MODULE, 1278 .release = inet6_release, 1279 .bind = inet6_bind, 1280 .connect = inet_dgram_connect, /* ok */ 1281 .socketpair = sock_no_socketpair, /* a do nothing */ 1282 .accept = sock_no_accept, /* a do nothing */ 1283 .getname = inet6_getname, 1284 .poll = datagram_poll, /* ok */ 1285 .ioctl = inet6_ioctl, /* must change */ 1286 .gettstamp = sock_gettstamp, 1287 .listen = sock_no_listen, /* ok */ 1288 .shutdown = inet_shutdown, /* ok */ 1289 .setsockopt = sock_common_setsockopt, /* ok */ 1290 .getsockopt = sock_common_getsockopt, /* ok */ 1291 .sendmsg = inet_sendmsg, /* ok */ 1292 .recvmsg = sock_common_recvmsg, /* ok */ 1293 .mmap = sock_no_mmap, 1294 #ifdef CONFIG_COMPAT 1295 .compat_ioctl = inet6_compat_ioctl, 1296 #endif 1297 }; 1298 1299 static struct inet_protosw rawv6_protosw = { 1300 .type = SOCK_RAW, 1301 .protocol = IPPROTO_IP, /* wild card */ 1302 .prot = &rawv6_prot, 1303 .ops = &inet6_sockraw_ops, 1304 .flags = INET_PROTOSW_REUSE, 1305 }; 1306 1307 int __init rawv6_init(void) 1308 { 1309 return inet6_register_protosw(&rawv6_protosw); 1310 } 1311 1312 void rawv6_exit(void) 1313 { 1314 inet6_unregister_protosw(&rawv6_protosw); 1315 } 1316