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 if (sock_queue_rcv_skb_reason(sk, skb, &reason) < 0) { 304 sk_skb_reason_drop(sk, skb, reason); 305 return NET_RX_DROP; 306 } 307 308 return NET_RX_SUCCESS; 309 } 310 311 int raw_rcv(struct sock *sk, struct sk_buff *skb) 312 { 313 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 314 sk_drops_inc(sk); 315 sk_skb_reason_drop(sk, skb, SKB_DROP_REASON_XFRM_POLICY); 316 return NET_RX_DROP; 317 } 318 nf_reset_ct(skb); 319 320 skb_push(skb, -skb_network_offset(skb)); 321 322 raw_rcv_skb(sk, skb); 323 return 0; 324 } 325 326 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, 327 struct msghdr *msg, size_t length, 328 struct rtable **rtp, unsigned int flags, 329 const struct sockcm_cookie *sockc) 330 { 331 struct inet_sock *inet = inet_sk(sk); 332 struct net *net = sock_net(sk); 333 struct iphdr *iph; 334 struct sk_buff *skb; 335 unsigned int iphlen; 336 int err; 337 struct rtable *rt = *rtp; 338 int hlen, tlen; 339 340 if (length > rt->dst.dev->mtu) { 341 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, 342 rt->dst.dev->mtu); 343 return -EMSGSIZE; 344 } 345 if (length < sizeof(struct iphdr)) 346 return -EINVAL; 347 348 if (flags&MSG_PROBE) 349 goto out; 350 351 hlen = LL_RESERVED_SPACE(rt->dst.dev); 352 tlen = rt->dst.dev->needed_tailroom; 353 skb = sock_alloc_send_skb(sk, 354 length + hlen + tlen + 15, 355 flags & MSG_DONTWAIT, &err); 356 if (!skb) 357 goto error; 358 skb_reserve(skb, hlen); 359 360 skb->protocol = htons(ETH_P_IP); 361 skb->priority = sockc->priority; 362 skb->mark = sockc->mark; 363 skb_set_delivery_type_by_clockid(skb, sockc->transmit_time, sk->sk_clockid); 364 skb_dst_set(skb, &rt->dst); 365 *rtp = NULL; 366 367 skb_reset_network_header(skb); 368 iph = ip_hdr(skb); 369 skb_put(skb, length); 370 371 skb->ip_summed = CHECKSUM_NONE; 372 373 skb_setup_tx_timestamp(skb, sockc); 374 375 if (flags & MSG_CONFIRM) 376 skb_set_dst_pending_confirm(skb, 1); 377 378 skb->transport_header = skb->network_header; 379 err = -EFAULT; 380 if (memcpy_from_msg(iph, msg, length)) 381 goto error_free; 382 383 iphlen = iph->ihl * 4; 384 385 /* 386 * We don't want to modify the ip header, but we do need to 387 * be sure that it won't cause problems later along the network 388 * stack. Specifically we want to make sure that iph->ihl is a 389 * sane value. If ihl points beyond the length of the buffer passed 390 * in, reject the frame as invalid 391 */ 392 err = -EINVAL; 393 if (iphlen > length) 394 goto error_free; 395 396 if (iphlen >= sizeof(*iph)) { 397 if (!iph->saddr) 398 iph->saddr = fl4->saddr; 399 iph->check = 0; 400 iph->tot_len = htons(length); 401 if (!iph->id) 402 ip_select_ident(net, skb, NULL); 403 404 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 405 skb->transport_header += iphlen; 406 if (iph->protocol == IPPROTO_ICMP && 407 length >= iphlen + sizeof(struct icmphdr)) 408 icmp_out_count(net, ((struct icmphdr *) 409 skb_transport_header(skb))->type); 410 } 411 412 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, 413 net, sk, skb, NULL, rt->dst.dev, 414 dst_output); 415 if (err > 0) 416 err = net_xmit_errno(err); 417 if (err) 418 goto error; 419 out: 420 return 0; 421 422 error_free: 423 kfree_skb(skb); 424 error: 425 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 426 if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk)) 427 err = 0; 428 return err; 429 } 430 431 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) 432 { 433 int err; 434 435 if (fl4->flowi4_proto != IPPROTO_ICMP) 436 return 0; 437 438 /* We only need the first two bytes. */ 439 rfv->hlen = 2; 440 441 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); 442 if (err) 443 return err; 444 445 fl4->fl4_icmp_type = rfv->hdr.icmph.type; 446 fl4->fl4_icmp_code = rfv->hdr.icmph.code; 447 448 return 0; 449 } 450 451 static int raw_getfrag(void *from, char *to, int offset, int len, int odd, 452 struct sk_buff *skb) 453 { 454 struct raw_frag_vec *rfv = from; 455 456 if (offset < rfv->hlen) { 457 int copy = min(rfv->hlen - offset, len); 458 459 if (skb->ip_summed == CHECKSUM_PARTIAL) 460 memcpy(to, rfv->hdr.c + offset, copy); 461 else 462 skb->csum = csum_block_add( 463 skb->csum, 464 csum_partial_copy_nocheck(rfv->hdr.c + offset, 465 to, copy), 466 odd); 467 468 odd = 0; 469 offset += copy; 470 to += copy; 471 len -= copy; 472 473 if (!len) 474 return 0; 475 } 476 477 offset -= rfv->hlen; 478 479 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 480 } 481 482 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 483 { 484 struct inet_sock *inet = inet_sk(sk); 485 struct net *net = sock_net(sk); 486 struct ipcm_cookie ipc; 487 struct rtable *rt = NULL; 488 struct flowi4 fl4; 489 u8 scope; 490 int free = 0; 491 __be32 daddr; 492 __be32 saddr; 493 int uc_index, err; 494 struct ip_options_data opt_copy; 495 struct raw_frag_vec rfv; 496 int hdrincl; 497 498 err = -EMSGSIZE; 499 if (len > 0xFFFF) 500 goto out; 501 502 hdrincl = inet_test_bit(HDRINCL, sk); 503 504 /* 505 * Check the flags. 506 */ 507 508 err = -EOPNOTSUPP; 509 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 510 goto out; /* compatibility */ 511 512 /* 513 * Get and verify the address. 514 */ 515 516 if (msg->msg_namelen) { 517 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); 518 err = -EINVAL; 519 if (msg->msg_namelen < sizeof(*usin)) 520 goto out; 521 if (usin->sin_family != AF_INET) { 522 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", 523 __func__, current->comm); 524 err = -EAFNOSUPPORT; 525 if (usin->sin_family) 526 goto out; 527 } 528 daddr = usin->sin_addr.s_addr; 529 /* ANK: I did not forget to get protocol from port field. 530 * I just do not know, who uses this weirdness. 531 * IP_HDRINCL is much more convenient. 532 */ 533 } else { 534 err = -EDESTADDRREQ; 535 if (sk->sk_state != TCP_ESTABLISHED) 536 goto out; 537 daddr = inet->inet_daddr; 538 } 539 540 ipcm_init_sk(&ipc, inet); 541 /* Keep backward compat */ 542 if (hdrincl) 543 ipc.protocol = IPPROTO_RAW; 544 545 if (msg->msg_controllen) { 546 err = ip_cmsg_send(sk, msg, &ipc, false); 547 if (unlikely(err)) { 548 kfree(ipc.opt); 549 goto out; 550 } 551 if (ipc.opt) 552 free = 1; 553 } 554 555 saddr = ipc.addr; 556 ipc.addr = daddr; 557 558 if (!ipc.opt) { 559 struct ip_options_rcu *inet_opt; 560 561 rcu_read_lock(); 562 inet_opt = rcu_dereference(inet->inet_opt); 563 if (inet_opt) { 564 memcpy(&opt_copy, inet_opt, 565 sizeof(*inet_opt) + inet_opt->opt.optlen); 566 ipc.opt = &opt_copy.opt; 567 } 568 rcu_read_unlock(); 569 } 570 571 if (ipc.opt) { 572 err = -EINVAL; 573 /* Linux does not mangle headers on raw sockets, 574 * so that IP options + IP_HDRINCL is non-sense. 575 */ 576 if (hdrincl) 577 goto done; 578 if (ipc.opt->opt.srr) { 579 if (!daddr) 580 goto done; 581 daddr = ipc.opt->opt.faddr; 582 } 583 } 584 scope = ip_sendmsg_scope(inet, &ipc, msg); 585 586 uc_index = READ_ONCE(inet->uc_index); 587 if (ipv4_is_multicast(daddr)) { 588 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif)) 589 ipc.oif = READ_ONCE(inet->mc_index); 590 if (!saddr) 591 saddr = READ_ONCE(inet->mc_addr); 592 } else if (!ipc.oif) { 593 ipc.oif = uc_index; 594 } else if (ipv4_is_lbcast(daddr) && uc_index) { 595 /* oif is set, packet is to local broadcast 596 * and uc_index is set. oif is most likely set 597 * by sk_bound_dev_if. If uc_index != oif check if the 598 * oif is an L3 master and uc_index is an L3 slave. 599 * If so, we want to allow the send using the uc_index. 600 */ 601 if (ipc.oif != uc_index && 602 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk), 603 uc_index)) { 604 ipc.oif = uc_index; 605 } 606 } 607 608 flowi4_init_output(&fl4, ipc.oif, ipc.sockc.mark, 609 ipc.tos & INET_DSCP_MASK, scope, 610 hdrincl ? ipc.protocol : sk->sk_protocol, 611 inet_sk_flowi_flags(sk) | 612 (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 613 daddr, saddr, 0, 0, sk_uid(sk)); 614 615 fl4.fl4_icmp_type = 0; 616 fl4.fl4_icmp_code = 0; 617 618 if (!hdrincl) { 619 rfv.msg = msg; 620 rfv.hlen = 0; 621 622 err = raw_probe_proto_opt(&rfv, &fl4); 623 if (err) 624 goto done; 625 } 626 627 security_sk_classify_flow(sk, flowi4_to_flowi_common(&fl4)); 628 rt = ip_route_output_flow(net, &fl4, sk); 629 if (IS_ERR(rt)) { 630 err = PTR_ERR(rt); 631 rt = NULL; 632 goto done; 633 } 634 635 err = -EACCES; 636 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 637 goto done; 638 639 if (msg->msg_flags & MSG_CONFIRM) 640 goto do_confirm; 641 back_from_confirm: 642 643 if (hdrincl) 644 err = raw_send_hdrinc(sk, &fl4, msg, len, 645 &rt, msg->msg_flags, &ipc.sockc); 646 647 else { 648 if (!ipc.addr) 649 ipc.addr = fl4.daddr; 650 lock_sock(sk); 651 err = ip_append_data(sk, &fl4, raw_getfrag, 652 &rfv, len, 0, 653 &ipc, &rt, msg->msg_flags); 654 if (err) 655 ip_flush_pending_frames(sk); 656 else if (!(msg->msg_flags & MSG_MORE)) { 657 err = ip_push_pending_frames(sk, &fl4); 658 if (err == -ENOBUFS && !inet_test_bit(RECVERR, sk)) 659 err = 0; 660 } 661 release_sock(sk); 662 } 663 done: 664 if (free) 665 kfree(ipc.opt); 666 ip_rt_put(rt); 667 668 out: 669 if (err < 0) 670 return err; 671 return len; 672 673 do_confirm: 674 if (msg->msg_flags & MSG_PROBE) 675 dst_confirm_neigh(&rt->dst, &fl4.daddr); 676 if (!(msg->msg_flags & MSG_PROBE) || len) 677 goto back_from_confirm; 678 err = 0; 679 goto done; 680 } 681 682 static void raw_close(struct sock *sk, long timeout) 683 { 684 /* 685 * Raw sockets may have direct kernel references. Kill them. 686 */ 687 ip_ra_control(sk, 0, NULL); 688 689 sk_common_release(sk); 690 } 691 692 static void raw_destroy(struct sock *sk) 693 { 694 lock_sock(sk); 695 ip_flush_pending_frames(sk); 696 release_sock(sk); 697 } 698 699 /* This gets rid of all the nasties in af_inet. -DaveM */ 700 static int raw_bind(struct sock *sk, struct sockaddr_unsized *uaddr, 701 int addr_len) 702 { 703 struct inet_sock *inet = inet_sk(sk); 704 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 705 struct net *net = sock_net(sk); 706 u32 tb_id = RT_TABLE_LOCAL; 707 int ret = -EINVAL; 708 int chk_addr_ret; 709 710 lock_sock(sk); 711 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 712 goto out; 713 714 if (sk->sk_bound_dev_if) 715 tb_id = l3mdev_fib_table_by_index(net, 716 sk->sk_bound_dev_if) ? : tb_id; 717 718 chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id); 719 720 ret = -EADDRNOTAVAIL; 721 if (!inet_addr_valid_or_nonlocal(net, inet, addr->sin_addr.s_addr, 722 chk_addr_ret)) 723 goto out; 724 725 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 726 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 727 inet->inet_saddr = 0; /* Use device */ 728 sk_dst_reset(sk); 729 ret = 0; 730 out: 731 release_sock(sk); 732 return ret; 733 } 734 735 /* 736 * This should be easy, if there is something there 737 * we return it, otherwise we block. 738 */ 739 740 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 741 int flags, int *addr_len) 742 { 743 struct inet_sock *inet = inet_sk(sk); 744 size_t copied = 0; 745 int err = -EOPNOTSUPP; 746 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 747 struct sk_buff *skb; 748 749 if (flags & MSG_OOB) 750 goto out; 751 752 if (flags & MSG_ERRQUEUE) { 753 err = ip_recv_error(sk, msg, len, addr_len); 754 goto out; 755 } 756 757 skb = skb_recv_datagram(sk, flags, &err); 758 if (!skb) 759 goto out; 760 761 copied = skb->len; 762 if (len < copied) { 763 msg->msg_flags |= MSG_TRUNC; 764 copied = len; 765 } 766 767 err = skb_copy_datagram_msg(skb, 0, msg, copied); 768 if (err) 769 goto done; 770 771 sock_recv_cmsgs(msg, sk, skb); 772 773 /* Copy the address. */ 774 if (sin) { 775 sin->sin_family = AF_INET; 776 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 777 sin->sin_port = 0; 778 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 779 *addr_len = sizeof(*sin); 780 } 781 if (inet_cmsg_flags(inet)) 782 ip_cmsg_recv(msg, skb); 783 if (flags & MSG_TRUNC) 784 copied = skb->len; 785 done: 786 skb_free_datagram(sk, skb); 787 out: 788 if (err) 789 return err; 790 return copied; 791 } 792 793 static int raw_sk_init(struct sock *sk) 794 { 795 struct raw_sock *rp = raw_sk(sk); 796 797 sk->sk_drop_counters = &rp->drop_counters; 798 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 799 memset(&rp->filter, 0, sizeof(rp->filter)); 800 return 0; 801 } 802 803 static int raw_seticmpfilter(struct sock *sk, sockptr_t optval, int optlen) 804 { 805 if (optlen > sizeof(struct icmp_filter)) 806 optlen = sizeof(struct icmp_filter); 807 if (copy_from_sockptr(&raw_sk(sk)->filter, optval, optlen)) 808 return -EFAULT; 809 return 0; 810 } 811 812 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 813 { 814 int len, ret = -EFAULT; 815 816 if (get_user(len, optlen)) 817 goto out; 818 ret = -EINVAL; 819 if (len < 0) 820 goto out; 821 if (len > sizeof(struct icmp_filter)) 822 len = sizeof(struct icmp_filter); 823 ret = -EFAULT; 824 if (put_user(len, optlen) || 825 copy_to_user(optval, &raw_sk(sk)->filter, len)) 826 goto out; 827 ret = 0; 828 out: return ret; 829 } 830 831 static int do_raw_setsockopt(struct sock *sk, int optname, 832 sockptr_t optval, unsigned int optlen) 833 { 834 if (optname == ICMP_FILTER) { 835 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 836 return -EOPNOTSUPP; 837 else 838 return raw_seticmpfilter(sk, optval, optlen); 839 } 840 return -ENOPROTOOPT; 841 } 842 843 static int raw_setsockopt(struct sock *sk, int level, int optname, 844 sockptr_t optval, unsigned int optlen) 845 { 846 if (level != SOL_RAW) 847 return ip_setsockopt(sk, level, optname, optval, optlen); 848 return do_raw_setsockopt(sk, optname, optval, optlen); 849 } 850 851 static int do_raw_getsockopt(struct sock *sk, int optname, 852 char __user *optval, int __user *optlen) 853 { 854 if (optname == ICMP_FILTER) { 855 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 856 return -EOPNOTSUPP; 857 else 858 return raw_geticmpfilter(sk, optval, optlen); 859 } 860 return -ENOPROTOOPT; 861 } 862 863 static int raw_getsockopt(struct sock *sk, int level, int optname, 864 char __user *optval, int __user *optlen) 865 { 866 if (level != SOL_RAW) 867 return ip_getsockopt(sk, level, optname, optval, optlen); 868 return do_raw_getsockopt(sk, optname, optval, optlen); 869 } 870 871 static int raw_ioctl(struct sock *sk, int cmd, int *karg) 872 { 873 switch (cmd) { 874 case SIOCOUTQ: { 875 *karg = sk_wmem_alloc_get(sk); 876 return 0; 877 } 878 case SIOCINQ: { 879 struct sk_buff *skb; 880 881 spin_lock_bh(&sk->sk_receive_queue.lock); 882 skb = skb_peek(&sk->sk_receive_queue); 883 if (skb) 884 *karg = skb->len; 885 else 886 *karg = 0; 887 spin_unlock_bh(&sk->sk_receive_queue.lock); 888 return 0; 889 } 890 891 default: 892 #ifdef CONFIG_IP_MROUTE 893 return ipmr_ioctl(sk, cmd, karg); 894 #else 895 return -ENOIOCTLCMD; 896 #endif 897 } 898 } 899 900 #ifdef CONFIG_COMPAT 901 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 902 { 903 switch (cmd) { 904 case SIOCOUTQ: 905 case SIOCINQ: 906 return -ENOIOCTLCMD; 907 default: 908 #ifdef CONFIG_IP_MROUTE 909 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 910 #else 911 return -ENOIOCTLCMD; 912 #endif 913 } 914 } 915 #endif 916 917 int raw_abort(struct sock *sk, int err) 918 { 919 lock_sock(sk); 920 921 sk->sk_err = err; 922 sk_error_report(sk); 923 __udp_disconnect(sk, 0); 924 925 release_sock(sk); 926 927 return 0; 928 } 929 EXPORT_SYMBOL_GPL(raw_abort); 930 931 struct proto raw_prot = { 932 .name = "RAW", 933 .owner = THIS_MODULE, 934 .close = raw_close, 935 .destroy = raw_destroy, 936 .connect = ip4_datagram_connect, 937 .disconnect = __udp_disconnect, 938 .ioctl = raw_ioctl, 939 .init = raw_sk_init, 940 .setsockopt = raw_setsockopt, 941 .getsockopt = raw_getsockopt, 942 .sendmsg = raw_sendmsg, 943 .recvmsg = raw_recvmsg, 944 .bind = raw_bind, 945 .backlog_rcv = raw_rcv_skb, 946 .release_cb = ip4_datagram_release_cb, 947 .hash = raw_hash_sk, 948 .unhash = raw_unhash_sk, 949 .obj_size = sizeof(struct raw_sock), 950 .useroffset = offsetof(struct raw_sock, filter), 951 .usersize = sizeof_field(struct raw_sock, filter), 952 .h.raw_hash = &raw_v4_hashinfo, 953 #ifdef CONFIG_COMPAT 954 .compat_ioctl = compat_raw_ioctl, 955 #endif 956 .diag_destroy = raw_abort, 957 }; 958 959 #ifdef CONFIG_PROC_FS 960 static struct sock *raw_get_first(struct seq_file *seq, int bucket) 961 { 962 struct raw_hashinfo *h = pde_data(file_inode(seq->file)); 963 struct raw_iter_state *state = raw_seq_private(seq); 964 struct hlist_head *hlist; 965 struct sock *sk; 966 967 for (state->bucket = bucket; state->bucket < RAW_HTABLE_SIZE; 968 ++state->bucket) { 969 hlist = &h->ht[state->bucket]; 970 sk_for_each(sk, hlist) { 971 if (sock_net(sk) == seq_file_net(seq)) 972 return sk; 973 } 974 } 975 return NULL; 976 } 977 978 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 979 { 980 struct raw_iter_state *state = raw_seq_private(seq); 981 982 do { 983 sk = sk_next(sk); 984 } while (sk && sock_net(sk) != seq_file_net(seq)); 985 986 if (!sk) 987 return raw_get_first(seq, state->bucket + 1); 988 return sk; 989 } 990 991 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 992 { 993 struct sock *sk = raw_get_first(seq, 0); 994 995 if (sk) 996 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 997 --pos; 998 return pos ? NULL : sk; 999 } 1000 1001 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 1002 __acquires(&h->lock) 1003 { 1004 struct raw_hashinfo *h = pde_data(file_inode(seq->file)); 1005 1006 spin_lock(&h->lock); 1007 1008 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1009 } 1010 EXPORT_SYMBOL_GPL(raw_seq_start); 1011 1012 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1013 { 1014 struct sock *sk; 1015 1016 if (v == SEQ_START_TOKEN) 1017 sk = raw_get_first(seq, 0); 1018 else 1019 sk = raw_get_next(seq, v); 1020 ++*pos; 1021 return sk; 1022 } 1023 EXPORT_SYMBOL_GPL(raw_seq_next); 1024 1025 void raw_seq_stop(struct seq_file *seq, void *v) 1026 __releases(&h->lock) 1027 { 1028 struct raw_hashinfo *h = pde_data(file_inode(seq->file)); 1029 1030 spin_unlock(&h->lock); 1031 } 1032 EXPORT_SYMBOL_GPL(raw_seq_stop); 1033 1034 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1035 { 1036 struct inet_sock *inet = inet_sk(sp); 1037 __be32 dest = inet->inet_daddr, 1038 src = inet->inet_rcv_saddr; 1039 __u16 destp = 0, 1040 srcp = inet->inet_num; 1041 1042 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1043 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", 1044 i, src, srcp, dest, destp, sp->sk_state, 1045 sk_wmem_alloc_get(sp), 1046 sk_rmem_alloc_get(sp), 1047 0, 0L, 0, 1048 from_kuid_munged(seq_user_ns(seq), sk_uid(sp)), 1049 0, sock_i_ino(sp), 1050 refcount_read(&sp->sk_refcnt), sp, sk_drops_read(sp)); 1051 } 1052 1053 static int raw_seq_show(struct seq_file *seq, void *v) 1054 { 1055 if (v == SEQ_START_TOKEN) 1056 seq_printf(seq, " sl local_address rem_address st tx_queue " 1057 "rx_queue tr tm->when retrnsmt uid timeout " 1058 "inode ref pointer drops\n"); 1059 else 1060 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1061 return 0; 1062 } 1063 1064 static const struct seq_operations raw_seq_ops = { 1065 .start = raw_seq_start, 1066 .next = raw_seq_next, 1067 .stop = raw_seq_stop, 1068 .show = raw_seq_show, 1069 }; 1070 1071 static __net_init int raw_init_net(struct net *net) 1072 { 1073 if (!proc_create_net_data("raw", 0444, net->proc_net, &raw_seq_ops, 1074 sizeof(struct raw_iter_state), &raw_v4_hashinfo)) 1075 return -ENOMEM; 1076 1077 return 0; 1078 } 1079 1080 static __net_exit void raw_exit_net(struct net *net) 1081 { 1082 remove_proc_entry("raw", net->proc_net); 1083 } 1084 1085 static __net_initdata struct pernet_operations raw_net_ops = { 1086 .init = raw_init_net, 1087 .exit = raw_exit_net, 1088 }; 1089 1090 int __init raw_proc_init(void) 1091 { 1092 1093 return register_pernet_subsys(&raw_net_ops); 1094 } 1095 1096 void __init raw_proc_exit(void) 1097 { 1098 unregister_pernet_subsys(&raw_net_ops); 1099 } 1100 #endif /* CONFIG_PROC_FS */ 1101 1102 static void raw_sysctl_init_net(struct net *net) 1103 { 1104 #ifdef CONFIG_NET_L3_MASTER_DEV 1105 net->ipv4.sysctl_raw_l3mdev_accept = 1; 1106 #endif 1107 } 1108 1109 static int __net_init raw_sysctl_init(struct net *net) 1110 { 1111 raw_sysctl_init_net(net); 1112 return 0; 1113 } 1114 1115 static struct pernet_operations __net_initdata raw_sysctl_ops = { 1116 .init = raw_sysctl_init, 1117 }; 1118 1119 void __init raw_init(void) 1120 { 1121 raw_sysctl_init_net(&init_net); 1122 if (register_pernet_subsys(&raw_sysctl_ops)) 1123 panic("RAW: failed to init sysctl parameters.\n"); 1124 } 1125