1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * INET An implementation of the TCP/IP protocol suite for the LINUX 4 * operating system. INET is implemented using the BSD Socket 5 * interface as the means of communication with the user level. 6 * 7 * RAW - implementation of IP "raw" sockets. 8 * 9 * Authors: Ross Biro 10 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 11 * 12 * Fixes: 13 * Alan Cox : verify_area() fixed up 14 * Alan Cox : ICMP error handling 15 * Alan Cox : EMSGSIZE if you send too big a packet 16 * Alan Cox : Now uses generic datagrams and shared 17 * skbuff library. No more peek crashes, 18 * no more backlogs 19 * Alan Cox : Checks sk->broadcast. 20 * Alan Cox : Uses skb_free_datagram/skb_copy_datagram 21 * Alan Cox : Raw passes ip options too 22 * Alan Cox : Setsocketopt added 23 * Alan Cox : Fixed error return for broadcasts 24 * Alan Cox : Removed wake_up calls 25 * Alan Cox : Use ttl/tos 26 * Alan Cox : Cleaned up old debugging 27 * Alan Cox : Use new kernel side addresses 28 * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. 29 * Alan Cox : BSD style RAW socket demultiplexing. 30 * Alan Cox : Beginnings of mrouted support. 31 * Alan Cox : Added IP_HDRINCL option. 32 * Alan Cox : Skip broadcast check if BSDism set. 33 * David S. Miller : New socket lookup architecture. 34 */ 35 36 #include <linux/types.h> 37 #include <linux/atomic.h> 38 #include <asm/byteorder.h> 39 #include <asm/current.h> 40 #include <linux/uaccess.h> 41 #include <asm/ioctls.h> 42 #include <linux/stddef.h> 43 #include <linux/slab.h> 44 #include <linux/errno.h> 45 #include <linux/kernel.h> 46 #include <linux/export.h> 47 #include <linux/spinlock.h> 48 #include <linux/sockios.h> 49 #include <linux/socket.h> 50 #include <linux/in.h> 51 #include <linux/mroute.h> 52 #include <linux/netdevice.h> 53 #include <linux/in_route.h> 54 #include <linux/route.h> 55 #include <linux/skbuff.h> 56 #include <linux/igmp.h> 57 #include <net/net_namespace.h> 58 #include <net/dst.h> 59 #include <net/sock.h> 60 #include <linux/ip.h> 61 #include <linux/net.h> 62 #include <net/ip.h> 63 #include <net/icmp.h> 64 #include <net/udp.h> 65 #include <net/raw.h> 66 #include <net/snmp.h> 67 #include <net/tcp_states.h> 68 #include <net/inet_common.h> 69 #include <net/checksum.h> 70 #include <net/xfrm.h> 71 #include <linux/rtnetlink.h> 72 #include <linux/proc_fs.h> 73 #include <linux/seq_file.h> 74 #include <linux/netfilter.h> 75 #include <linux/netfilter_ipv4.h> 76 #include <linux/compat.h> 77 #include <linux/uio.h> 78 79 struct raw_frag_vec { 80 struct msghdr *msg; 81 union { 82 struct icmphdr icmph; 83 char c[1]; 84 } hdr; 85 int hlen; 86 }; 87 88 struct raw_hashinfo raw_v4_hashinfo; 89 EXPORT_SYMBOL_GPL(raw_v4_hashinfo); 90 91 int raw_hash_sk(struct sock *sk) 92 { 93 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 94 struct hlist_head *hlist; 95 96 hlist = &h->ht[raw_hashfunc(sock_net(sk), inet_sk(sk)->inet_num)]; 97 98 spin_lock(&h->lock); 99 sk_add_node_rcu(sk, hlist); 100 sock_set_flag(sk, SOCK_RCU_FREE); 101 spin_unlock(&h->lock); 102 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 103 104 return 0; 105 } 106 EXPORT_SYMBOL_GPL(raw_hash_sk); 107 108 void raw_unhash_sk(struct sock *sk) 109 { 110 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 111 112 spin_lock(&h->lock); 113 if (sk_del_node_init_rcu(sk)) 114 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 115 spin_unlock(&h->lock); 116 } 117 EXPORT_SYMBOL_GPL(raw_unhash_sk); 118 119 bool raw_v4_match(struct net *net, const struct sock *sk, unsigned short num, 120 __be32 raddr, __be32 laddr, int dif, int sdif) 121 { 122 const struct inet_sock *inet = inet_sk(sk); 123 124 if (net_eq(sock_net(sk), net) && inet->inet_num == num && 125 !(inet->inet_daddr && inet->inet_daddr != raddr) && 126 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && 127 raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif)) 128 return true; 129 return false; 130 } 131 EXPORT_SYMBOL_GPL(raw_v4_match); 132 133 /* 134 * 0 - deliver 135 * 1 - block 136 */ 137 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb) 138 { 139 struct icmphdr _hdr; 140 const struct icmphdr *hdr; 141 142 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 143 sizeof(_hdr), &_hdr); 144 if (!hdr) 145 return 1; 146 147 if (hdr->type < 32) { 148 __u32 data = raw_sk(sk)->filter.data; 149 150 return ((1U << hdr->type) & data) != 0; 151 } 152 153 /* Do not block unknown ICMP types */ 154 return 0; 155 } 156 157 /* IP input processing comes here for RAW socket delivery. 158 * Caller owns SKB, so we must make clones. 159 * 160 * RFC 1122: SHOULD pass TOS value up to the transport layer. 161 * -> It does. And not only TOS, but all IP header. 162 */ 163 static int raw_v4_input(struct net *net, struct sk_buff *skb, 164 const struct iphdr *iph, int hash) 165 { 166 int sdif = inet_sdif(skb); 167 struct hlist_head *hlist; 168 int dif = inet_iif(skb); 169 int delivered = 0; 170 struct sock *sk; 171 172 hlist = &raw_v4_hashinfo.ht[hash]; 173 rcu_read_lock(); 174 sk_for_each_rcu(sk, hlist) { 175 if (!raw_v4_match(net, sk, iph->protocol, 176 iph->saddr, iph->daddr, dif, sdif)) 177 continue; 178 179 if (atomic_read(&sk->sk_rmem_alloc) >= 180 READ_ONCE(sk->sk_rcvbuf)) { 181 sk_drops_inc(sk); 182 continue; 183 } 184 185 delivered = 1; 186 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) && 187 ip_mc_sf_allow(sk, iph->daddr, iph->saddr, 188 skb->dev->ifindex, sdif)) { 189 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 190 191 /* Not releasing hash table! */ 192 if (clone) 193 raw_rcv(sk, clone); 194 } 195 } 196 rcu_read_unlock(); 197 return delivered; 198 } 199 200 int raw_local_deliver(struct sk_buff *skb, int protocol) 201 { 202 struct net *net = dev_net(skb->dev); 203 204 return raw_v4_input(net, skb, ip_hdr(skb), 205 raw_hashfunc(net, protocol)); 206 } 207 208 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) 209 { 210 struct inet_sock *inet = inet_sk(sk); 211 const int type = icmp_hdr(skb)->type; 212 const int code = icmp_hdr(skb)->code; 213 int harderr = 0; 214 bool recverr; 215 int err = 0; 216 217 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) 218 ipv4_sk_update_pmtu(skb, sk, info); 219 else if (type == ICMP_REDIRECT) { 220 ipv4_sk_redirect(skb, sk); 221 return; 222 } 223 224 /* Report error on raw socket, if: 225 1. User requested ip_recverr. 226 2. Socket is connected (otherwise the error indication 227 is useless without ip_recverr and error is hard. 228 */ 229 recverr = inet_test_bit(RECVERR, sk); 230 if (!recverr && sk->sk_state != TCP_ESTABLISHED) 231 return; 232 233 switch (type) { 234 default: 235 case ICMP_TIME_EXCEEDED: 236 err = EHOSTUNREACH; 237 break; 238 case ICMP_SOURCE_QUENCH: 239 return; 240 case ICMP_PARAMETERPROB: 241 err = EPROTO; 242 harderr = 1; 243 break; 244 case ICMP_DEST_UNREACH: 245 err = EHOSTUNREACH; 246 if (code > NR_ICMP_UNREACH) 247 break; 248 if (code == ICMP_FRAG_NEEDED) { 249 harderr = READ_ONCE(inet->pmtudisc) != IP_PMTUDISC_DONT; 250 err = EMSGSIZE; 251 } else { 252 err = icmp_err_convert[code].errno; 253 harderr = icmp_err_convert[code].fatal; 254 } 255 } 256 257 if (recverr) { 258 const struct iphdr *iph = (const struct iphdr *)skb->data; 259 u8 *payload = skb->data + (iph->ihl << 2); 260 261 if (inet_test_bit(HDRINCL, sk)) 262 payload = skb->data; 263 ip_icmp_error(sk, skb, err, 0, info, payload); 264 } 265 266 if (recverr || harderr) { 267 sk->sk_err = err; 268 sk_error_report(sk); 269 } 270 } 271 272 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) 273 { 274 struct net *net = dev_net(skb->dev); 275 int dif = skb->dev->ifindex; 276 int sdif = inet_sdif(skb); 277 struct hlist_head *hlist; 278 const struct iphdr *iph; 279 struct sock *sk; 280 int hash; 281 282 hash = raw_hashfunc(net, protocol); 283 hlist = &raw_v4_hashinfo.ht[hash]; 284 285 rcu_read_lock(); 286 sk_for_each_rcu(sk, hlist) { 287 iph = (const struct iphdr *)skb->data; 288 if (!raw_v4_match(net, sk, iph->protocol, 289 iph->daddr, iph->saddr, dif, sdif)) 290 continue; 291 raw_err(sk, skb, info); 292 } 293 rcu_read_unlock(); 294 } 295 296 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) 297 { 298 enum skb_drop_reason reason; 299 300 /* Charge it to the socket. */ 301 302 ipv4_pktinfo_prepare(sk, skb, true); 303 reason = sock_queue_rcv_skb_reason(sk, skb); 304 if (reason) { 305 sk_skb_reason_drop(sk, skb, reason); 306 return NET_RX_DROP; 307 } 308 309 return NET_RX_SUCCESS; 310 } 311 312 int raw_rcv(struct sock *sk, struct sk_buff *skb) 313 { 314 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 315 sk_drops_inc(sk); 316 sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_XFRM_POLICY); 317 return NET_RX_DROP; 318 } 319 nf_reset_ct(skb); 320 321 skb_push(skb, -skb_network_offset(skb)); 322 323 raw_rcv_skb(sk, skb); 324 return 0; 325 } 326 327 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, 328 struct msghdr *msg, size_t length, 329 struct rtable **rtp, unsigned int flags, 330 const struct sockcm_cookie *sockc) 331 { 332 struct inet_sock *inet = inet_sk(sk); 333 struct net *net = sock_net(sk); 334 struct iphdr *iph; 335 struct sk_buff *skb; 336 unsigned int iphlen; 337 int err; 338 struct rtable *rt = *rtp; 339 int hlen, tlen; 340 341 if (length > rt->dst.dev->mtu) { 342 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, 343 rt->dst.dev->mtu); 344 return -EMSGSIZE; 345 } 346 if (length < sizeof(struct iphdr)) 347 return -EINVAL; 348 349 if (flags&MSG_PROBE) 350 goto out; 351 352 hlen = LL_RESERVED_SPACE(rt->dst.dev); 353 tlen = rt->dst.dev->needed_tailroom; 354 skb = sock_alloc_send_skb(sk, 355 length + hlen + tlen + 15, 356 flags & MSG_DONTWAIT, &err); 357 if (!skb) 358 goto error; 359 skb_reserve(skb, hlen); 360 361 skb->protocol = htons(ETH_P_IP); 362 skb->priority = sockc->priority; 363 skb->mark = sockc->mark; 364 skb_set_delivery_type_by_clockid(skb, sockc->transmit_time, sk->sk_clockid); 365 skb_dst_set(skb, &rt->dst); 366 *rtp = NULL; 367 368 skb_reset_network_header(skb); 369 iph = ip_hdr(skb); 370 skb_put(skb, length); 371 372 skb->ip_summed = CHECKSUM_NONE; 373 374 skb_setup_tx_timestamp(skb, sockc); 375 376 if (flags & MSG_CONFIRM) 377 skb_set_dst_pending_confirm(skb, 1); 378 379 skb->transport_header = skb->network_header; 380 err = -EFAULT; 381 if (memcpy_from_msg(iph, msg, length)) 382 goto error_free; 383 384 iphlen = iph->ihl * 4; 385 386 /* 387 * We don't want to modify the ip header, but we do need to 388 * be sure that it won't cause problems later along the network 389 * stack. Specifically we want to make sure that iph->ihl is a 390 * sane value. If ihl points beyond the length of the buffer passed 391 * in, reject the frame as invalid 392 */ 393 err = -EINVAL; 394 if (iphlen > length) 395 goto error_free; 396 397 if (iphlen >= sizeof(*iph)) { 398 if (!iph->saddr) 399 iph->saddr = fl4->saddr; 400 iph->check = 0; 401 iph->tot_len = htons(length); 402 if (!iph->id) 403 ip_select_ident(net, skb, NULL); 404 405 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 406 skb->transport_header += iphlen; 407 if (iph->protocol == IPPROTO_ICMP && 408 length >= iphlen + sizeof(struct icmphdr)) 409 icmp_out_count(net, ((struct icmphdr *) 410 skb_transport_header(skb))->type); 411 } 412 413 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, 414 net, sk, skb, NULL, rt->dst.dev, 415 dst_output); 416 if (err > 0) 417 err = net_xmit_errno(err); 418 if (err) 419 goto error; 420 out: 421 return 0; 422 423 error_free: 424 kfree_skb(skb); 425 error: 426 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 427 if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk)) 428 err = 0; 429 return err; 430 } 431 432 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) 433 { 434 int err; 435 436 if (fl4->flowi4_proto != IPPROTO_ICMP) 437 return 0; 438 439 /* We only need the first two bytes. */ 440 rfv->hlen = 2; 441 442 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); 443 if (err) 444 return err; 445 446 fl4->fl4_icmp_type = rfv->hdr.icmph.type; 447 fl4->fl4_icmp_code = rfv->hdr.icmph.code; 448 449 return 0; 450 } 451 452 static int raw_getfrag(void *from, char *to, int offset, int len, int odd, 453 struct sk_buff *skb) 454 { 455 struct raw_frag_vec *rfv = from; 456 457 if (offset < rfv->hlen) { 458 int copy = min(rfv->hlen - offset, len); 459 460 if (skb->ip_summed == CHECKSUM_PARTIAL) 461 memcpy(to, rfv->hdr.c + offset, copy); 462 else 463 skb->csum = csum_block_add( 464 skb->csum, 465 csum_partial_copy_nocheck(rfv->hdr.c + offset, 466 to, copy), 467 odd); 468 469 odd = 0; 470 offset += copy; 471 to += copy; 472 len -= copy; 473 474 if (!len) 475 return 0; 476 } 477 478 offset -= rfv->hlen; 479 480 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 481 } 482 483 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 484 { 485 DEFINE_RAW_FLEX(struct ip_options_rcu, opt_copy, opt.__data, 486 IP_OPTIONS_DATA_FIXED_SIZE); 487 struct inet_sock *inet = inet_sk(sk); 488 struct net *net = sock_net(sk); 489 struct ipcm_cookie ipc; 490 struct rtable *rt = NULL; 491 struct flowi4 fl4; 492 u8 scope; 493 int free = 0; 494 __be32 daddr; 495 __be32 saddr; 496 int uc_index, err; 497 struct raw_frag_vec rfv; 498 int hdrincl; 499 500 err = -EMSGSIZE; 501 if (len > 0xFFFF) 502 goto out; 503 504 hdrincl = inet_test_bit(HDRINCL, sk); 505 506 /* 507 * Check the flags. 508 */ 509 510 err = -EOPNOTSUPP; 511 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 512 goto out; /* compatibility */ 513 514 /* 515 * Get and verify the address. 516 */ 517 518 if (msg->msg_namelen) { 519 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); 520 err = -EINVAL; 521 if (msg->msg_namelen < sizeof(*usin)) 522 goto out; 523 if (usin->sin_family != AF_INET) { 524 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", 525 __func__, current->comm); 526 err = -EAFNOSUPPORT; 527 if (usin->sin_family) 528 goto out; 529 } 530 daddr = usin->sin_addr.s_addr; 531 /* ANK: I did not forget to get protocol from port field. 532 * I just do not know, who uses this weirdness. 533 * IP_HDRINCL is much more convenient. 534 */ 535 } else { 536 err = -EDESTADDRREQ; 537 if (sk->sk_state != TCP_ESTABLISHED) 538 goto out; 539 daddr = inet->inet_daddr; 540 } 541 542 ipcm_init_sk(&ipc, inet); 543 /* Keep backward compat */ 544 if (hdrincl) 545 ipc.protocol = IPPROTO_RAW; 546 547 if (msg->msg_controllen) { 548 err = ip_cmsg_send(sk, msg, &ipc, false); 549 if (unlikely(err)) { 550 kfree(ipc.opt); 551 goto out; 552 } 553 if (ipc.opt) 554 free = 1; 555 } 556 557 saddr = ipc.addr; 558 ipc.addr = daddr; 559 560 if (!ipc.opt) { 561 struct ip_options_rcu *inet_opt; 562 563 rcu_read_lock(); 564 inet_opt = rcu_dereference(inet->inet_opt); 565 if (inet_opt) { 566 memcpy(opt_copy, inet_opt, 567 sizeof(*inet_opt) + inet_opt->opt.optlen); 568 ipc.opt = opt_copy; 569 } 570 rcu_read_unlock(); 571 } 572 573 if (ipc.opt) { 574 err = -EINVAL; 575 /* Linux does not mangle headers on raw sockets, 576 * so that IP options + IP_HDRINCL is non-sense. 577 */ 578 if (hdrincl) 579 goto done; 580 if (ipc.opt->opt.srr) { 581 if (!daddr) 582 goto done; 583 daddr = ipc.opt->opt.faddr; 584 } 585 } 586 scope = ip_sendmsg_scope(inet, &ipc, msg); 587 588 uc_index = READ_ONCE(inet->uc_index); 589 if (ipv4_is_multicast(daddr)) { 590 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) 591 ipc.oif = READ_ONCE(inet->mc_index); 592 if (!saddr) 593 saddr = READ_ONCE(inet->mc_addr); 594 } else if (!ipc.oif) { 595 ipc.oif = uc_index; 596 } else if (ipv4_is_lbcast(daddr) && uc_index) { 597 /* oif is set, packet is to local broadcast 598 * and uc_index is set. oif is most likely set 599 * by sk_bound_dev_if. If uc_index != oif check if the 600 * oif is an L3 master and uc_index is an L3 slave. 601 * If so, we want to allow the send using the uc_index. 602 */ 603 if (ipc.oif != uc_index && 604 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), 605 uc_index)) { 606 ipc.oif = uc_index; 607 } 608 } 609 610 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, 611 ipc.tos & INET_DSCP_MASK, scope, 612 hdrincl ? ipc.protocol : sk->sk_protocol, 613 inet_sk_flowi_flags(sk) | 614 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 615 daddr, saddr, 0, 0, sk_uid(sk)); 616 617 fl4.fl4_icmp_type = 0; 618 fl4.fl4_icmp_code = 0; 619 620 if (!hdrincl) { 621 rfv.msg = msg; 622 rfv.hlen = 0; 623 624 err = raw_probe_proto_opt(&rfv, &fl4); 625 if (err) 626 goto done; 627 } 628 629 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4)); 630 rt = ip_route_output_flow(net, &fl4, sk); 631 if (IS_ERR(rt)) { 632 err = PTR_ERR(rt); 633 rt = NULL; 634 goto done; 635 } 636 637 err = -EACCES; 638 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 639 goto done; 640 641 if (msg->msg_flags & MSG_CONFIRM) 642 goto do_confirm; 643 back_from_confirm: 644 645 if (hdrincl) 646 err = raw_send_hdrinc(sk, &fl4, msg, len, 647 &rt, msg->msg_flags, &ipc.sockc); 648 649 else { 650 if (!ipc.addr) 651 ipc.addr = fl4.daddr; 652 lock_sock(sk); 653 err = ip_append_data(sk, &fl4, raw_getfrag, 654 &rfv, len, 0, 655 &ipc, &rt, msg->msg_flags); 656 if (err) 657 ip_flush_pending_frames(sk); 658 else if (!(msg->msg_flags & MSG_MORE)) { 659 err = ip_push_pending_frames(sk, &fl4); 660 if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk)) 661 err = 0; 662 } 663 release_sock(sk); 664 } 665 done: 666 if (free) 667 kfree(ipc.opt); 668 ip_rt_put(rt); 669 670 out: 671 if (err < 0) 672 return err; 673 return len; 674 675 do_confirm: 676 if (msg->msg_flags & MSG_PROBE) 677 dst_confirm_neigh(&rt->dst, &fl4.daddr); 678 if (!(msg->msg_flags & MSG_PROBE) || len) 679 goto back_from_confirm; 680 err = 0; 681 goto done; 682 } 683 684 static void raw_close(struct sock *sk, long timeout) 685 { 686 /* 687 * Raw sockets may have direct kernel references. Kill them. 688 */ 689 ip_ra_control(sk, 0, NULL); 690 691 sk_common_release(sk); 692 } 693 694 static void raw_destroy(struct sock *sk) 695 { 696 lock_sock(sk); 697 ip_flush_pending_frames(sk); 698 release_sock(sk); 699 } 700 701 /* This gets rid of all the nasties in af_inet. -DaveM */ 702 static int raw_bind(struct sock *sk, struct sockaddr_unsized *uaddr, 703 int addr_len) 704 { 705 struct inet_sock *inet = inet_sk(sk); 706 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 707 struct net *net = sock_net(sk); 708 u32 tb_id = RT_TABLE_LOCAL; 709 int ret = -EINVAL; 710 int chk_addr_ret; 711 712 lock_sock(sk); 713 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 714 goto out; 715 716 if (sk->sk_bound_dev_if) 717 tb_id = l3mdev_fib_table_by_index(net, 718 sk->sk_bound_dev_if) ? : tb_id; 719 720 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 721 722 ret = -EADDRNOTAVAIL; 723 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr, 724 chk_addr_ret)) 725 goto out; 726 727 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 728 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 729 inet->inet_saddr = 0; /* Use device */ 730 sk_dst_reset(sk); 731 ret = 0; 732 out: 733 release_sock(sk); 734 return ret; 735 } 736 737 /* 738 * This should be easy, if there is something there 739 * we return it, otherwise we block. 740 */ 741 742 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 743 int flags) 744 { 745 struct inet_sock *inet = inet_sk(sk); 746 size_t copied = 0; 747 int err = -EOPNOTSUPP; 748 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 749 struct sk_buff *skb; 750 751 if (flags & MSG_OOB) 752 goto out; 753 754 if (flags & MSG_ERRQUEUE) { 755 err = ip_recv_error(sk, msg, len); 756 goto out; 757 } 758 759 skb = skb_recv_datagram(sk, flags, &err); 760 if (!skb) 761 goto out; 762 763 copied = skb->len; 764 if (len < copied) { 765 msg->msg_flags |= MSG_TRUNC; 766 copied = len; 767 } 768 769 err = skb_copy_datagram_msg(skb, 0, msg, copied); 770 if (err) 771 goto done; 772 773 sock_recv_cmsgs(msg, sk, skb); 774 775 /* Copy the address. */ 776 if (sin) { 777 sin->sin_family = AF_INET; 778 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 779 sin->sin_port = 0; 780 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 781 msg->msg_namelen = sizeof(*sin); 782 } 783 if (inet_cmsg_flags(inet)) 784 ip_cmsg_recv(msg, skb); 785 if (flags & MSG_TRUNC) 786 copied = skb->len; 787 done: 788 skb_free_datagram(sk, skb); 789 out: 790 if (err) 791 return err; 792 return copied; 793 } 794 795 static int raw_sk_init(struct sock *sk) 796 { 797 struct raw_sock *rp = raw_sk(sk); 798 799 sk->sk_drop_counters = &rp->drop_counters; 800 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 801 memset(&rp->filter, 0, sizeof(rp->filter)); 802 return 0; 803 } 804 805 static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen) 806 { 807 if (optlen > sizeof(struct icmp_filter)) 808 optlen = sizeof(struct icmp_filter); 809 if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen)) 810 return -EFAULT; 811 return 0; 812 } 813 814 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 815 { 816 int len, ret = -EFAULT; 817 818 if (get_user(len, optlen)) 819 goto out; 820 ret = -EINVAL; 821 if (len < 0) 822 goto out; 823 if (len > sizeof(struct icmp_filter)) 824 len = sizeof(struct icmp_filter); 825 ret = -EFAULT; 826 if (put_user(len, optlen) || 827 copy_to_user(optval, &raw_sk(sk)->filter, len)) 828 goto out; 829 ret = 0; 830 out: return ret; 831 } 832 833 static int do_raw_setsockopt(struct sock *sk, int optname, 834 sockptr_t optval, unsigned int optlen) 835 { 836 if (optname == ICMP_FILTER) { 837 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 838 return -EOPNOTSUPP; 839 else 840 return raw_seticmpfilter(sk, optval, optlen); 841 } 842 return -ENOPROTOOPT; 843 } 844 845 static int raw_setsockopt(struct sock *sk, int level, int optname, 846 sockptr_t optval, unsigned int optlen) 847 { 848 if (level != SOL_RAW) 849 return ip_setsockopt(sk, level, optname, optval, optlen); 850 return do_raw_setsockopt(sk, optname, optval, optlen); 851 } 852 853 static int do_raw_getsockopt(struct sock *sk, int optname, 854 char __user *optval, int __user *optlen) 855 { 856 if (optname == ICMP_FILTER) { 857 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 858 return -EOPNOTSUPP; 859 else 860 return raw_geticmpfilter(sk, optval, optlen); 861 } 862 return -ENOPROTOOPT; 863 } 864 865 static int raw_getsockopt(struct sock *sk, int level, int optname, 866 char __user *optval, int __user *optlen) 867 { 868 if (level != SOL_RAW) 869 return ip_getsockopt(sk, level, optname, optval, optlen); 870 return do_raw_getsockopt(sk, optname, optval, optlen); 871 } 872 873 static int raw_ioctl(struct sock *sk, int cmd, int *karg) 874 { 875 switch (cmd) { 876 case SIOCOUTQ: { 877 *karg = sk_wmem_alloc_get(sk); 878 return 0; 879 } 880 case SIOCINQ: { 881 struct sk_buff *skb; 882 883 spin_lock_bh(&sk->sk_receive_queue.lock); 884 skb = skb_peek(&sk->sk_receive_queue); 885 if (skb) 886 *karg = skb->len; 887 else 888 *karg = 0; 889 spin_unlock_bh(&sk->sk_receive_queue.lock); 890 return 0; 891 } 892 893 default: 894 #ifdef CONFIG_IP_MROUTE 895 return ipmr_ioctl(sk, cmd, karg); 896 #else 897 return -ENOIOCTLCMD; 898 #endif 899 } 900 } 901 902 #ifdef CONFIG_COMPAT 903 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 904 { 905 switch (cmd) { 906 case SIOCOUTQ: 907 case SIOCINQ: 908 return -ENOIOCTLCMD; 909 default: 910 #ifdef CONFIG_IP_MROUTE 911 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 912 #else 913 return -ENOIOCTLCMD; 914 #endif 915 } 916 } 917 #endif 918 919 int raw_abort(struct sock *sk, int err) 920 { 921 lock_sock(sk); 922 923 sk->sk_err = err; 924 sk_error_report(sk); 925 __udp_disconnect(sk, 0); 926 927 release_sock(sk); 928 929 return 0; 930 } 931 EXPORT_SYMBOL_GPL(raw_abort); 932 933 struct proto raw_prot = { 934 .name = "RAW", 935 .owner = THIS_MODULE, 936 .close = raw_close, 937 .destroy = raw_destroy, 938 .connect = ip4_datagram_connect, 939 .disconnect = __udp_disconnect, 940 .ioctl = raw_ioctl, 941 .init = raw_sk_init, 942 .setsockopt = raw_setsockopt, 943 .getsockopt = raw_getsockopt, 944 .sendmsg = raw_sendmsg, 945 .recvmsg = raw_recvmsg, 946 .bind = raw_bind, 947 .backlog_rcv = raw_rcv_skb, 948 .release_cb = ip4_datagram_release_cb, 949 .hash = raw_hash_sk, 950 .unhash = raw_unhash_sk, 951 .obj_size = sizeof(struct raw_sock), 952 .useroffset = offsetof(struct raw_sock, filter), 953 .usersize = sizeof_field(struct raw_sock, filter), 954 .h.raw_hash = &raw_v4_hashinfo, 955 #ifdef CONFIG_COMPAT 956 .compat_ioctl = compat_raw_ioctl, 957 #endif 958 .diag_destroy = raw_abort, 959 }; 960 961 #ifdef CONFIG_PROC_FS 962 static struct sock *raw_get_first(struct seq_file *seq, int bucket) 963 { 964 struct raw_hashinfo *h = pde_data(file_inode(seq->file)); 965 struct raw_iter_state *state = raw_seq_private(seq); 966 struct hlist_head *hlist; 967 struct sock *sk; 968 969 for (state->bucket = bucket; state->bucket < RAW_HTABLE_SIZE; 970 ++state->bucket) { 971 hlist = &h->ht[state->bucket]; 972 sk_for_each(sk, hlist) { 973 if (sock_net(sk) == seq_file_net(seq)) 974 return sk; 975 } 976 } 977 return NULL; 978 } 979 980 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 981 { 982 struct raw_iter_state *state = raw_seq_private(seq); 983 984 do { 985 sk = sk_next(sk); 986 } while (sk && sock_net(sk) != seq_file_net(seq)); 987 988 if (!sk) 989 return raw_get_first(seq, state->bucket + 1); 990 return sk; 991 } 992 993 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 994 { 995 struct sock *sk = raw_get_first(seq, 0); 996 997 if (sk) 998 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 999 --pos; 1000 return pos ? NULL : sk; 1001 } 1002 1003 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 1004 __acquires(&h->lock) 1005 { 1006 struct raw_hashinfo *h = pde_data(file_inode(seq->file)); 1007 1008 spin_lock(&h->lock); 1009 1010 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1011 } 1012 EXPORT_SYMBOL_GPL(raw_seq_start); 1013 1014 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1015 { 1016 struct sock *sk; 1017 1018 if (v == SEQ_START_TOKEN) 1019 sk = raw_get_first(seq, 0); 1020 else 1021 sk = raw_get_next(seq, v); 1022 ++*pos; 1023 return sk; 1024 } 1025 EXPORT_SYMBOL_GPL(raw_seq_next); 1026 1027 void raw_seq_stop(struct seq_file *seq, void *v) 1028 __releases(&h->lock) 1029 { 1030 struct raw_hashinfo *h = pde_data(file_inode(seq->file)); 1031 1032 spin_unlock(&h->lock); 1033 } 1034 EXPORT_SYMBOL_GPL(raw_seq_stop); 1035 1036 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1037 { 1038 struct inet_sock *inet = inet_sk(sp); 1039 __be32 dest = inet->inet_daddr, 1040 src = inet->inet_rcv_saddr; 1041 __u16 destp = 0, 1042 srcp = inet->inet_num; 1043 1044 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1045 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %llu %d %pK %u\n", 1046 i, src, srcp, dest, destp, sp->sk_state, 1047 sk_wmem_alloc_get(sp), 1048 sk_rmem_alloc_get(sp), 1049 0, 0L, 0, 1050 from_kuid_munged(seq_user_ns(seq), sk_uid(sp)), 1051 0, sock_i_ino(sp), 1052 refcount_read(&sp->sk_refcnt), sp, sk_drops_read(sp)); 1053 } 1054 1055 static int raw_seq_show(struct seq_file *seq, void *v) 1056 { 1057 if (v == SEQ_START_TOKEN) 1058 seq_printf(seq, " sl local_address rem_address st tx_queue " 1059 "rx_queue tr tm->when retrnsmt uid timeout " 1060 "inode ref pointer drops\n"); 1061 else 1062 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1063 return 0; 1064 } 1065 1066 static const struct seq_operations raw_seq_ops = { 1067 .start = raw_seq_start, 1068 .next = raw_seq_next, 1069 .stop = raw_seq_stop, 1070 .show = raw_seq_show, 1071 }; 1072 1073 static __net_init int raw_init_net(struct net *net) 1074 { 1075 if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, 1076 sizeof(struct raw_iter_state), &raw_v4_hashinfo)) 1077 return -ENOMEM; 1078 1079 return 0; 1080 } 1081 1082 static __net_exit void raw_exit_net(struct net *net) 1083 { 1084 remove_proc_entry("raw", net->proc_net); 1085 } 1086 1087 static __net_initdata struct pernet_operations raw_net_ops = { 1088 .init = raw_init_net, 1089 .exit = raw_exit_net, 1090 }; 1091 1092 int __init raw_proc_init(void) 1093 { 1094 1095 return register_pernet_subsys(&raw_net_ops); 1096 } 1097 1098 void __init raw_proc_exit(void) 1099 { 1100 unregister_pernet_subsys(&raw_net_ops); 1101 } 1102 #endif /* CONFIG_PROC_FS */ 1103 1104 static void raw_sysctl_init_net(struct net *net) 1105 { 1106 #ifdef CONFIG_NET_L3_MASTER_DEV 1107 net->ipv4.sysctl_raw_l3mdev_accept = 1; 1108 #endif 1109 } 1110 1111 static int __net_init raw_sysctl_init(struct net *net) 1112 { 1113 raw_sysctl_init_net(net); 1114 return 0; 1115 } 1116 1117 static struct pernet_operations __net_initdata raw_sysctl_ops = { 1118 .init = raw_sysctl_init, 1119 }; 1120 1121 void __init raw_init(void) 1122 { 1123 raw_sysctl_init_net(&init_net); 1124 if (register_pernet_subsys(&raw_sysctl_ops)) 1125 panic("RAW: failed to init sysctl parameters.\n"); 1126 } 1127