1 /* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * RAW - implementation of IP "raw" sockets. 7 * 8 * Authors: Ross Biro 9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 10 * 11 * Fixes: 12 * Alan Cox : verify_area() fixed up 13 * Alan Cox : ICMP error handling 14 * Alan Cox : EMSGSIZE if you send too big a packet 15 * Alan Cox : Now uses generic datagrams and shared 16 * skbuff library. No more peek crashes, 17 * no more backlogs 18 * Alan Cox : Checks sk->broadcast. 19 * Alan Cox : Uses skb_free_datagram/skb_copy_datagram 20 * Alan Cox : Raw passes ip options too 21 * Alan Cox : Setsocketopt added 22 * Alan Cox : Fixed error return for broadcasts 23 * Alan Cox : Removed wake_up calls 24 * Alan Cox : Use ttl/tos 25 * Alan Cox : Cleaned up old debugging 26 * Alan Cox : Use new kernel side addresses 27 * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets. 28 * Alan Cox : BSD style RAW socket demultiplexing. 29 * Alan Cox : Beginnings of mrouted support. 30 * Alan Cox : Added IP_HDRINCL option. 31 * Alan Cox : Skip broadcast check if BSDism set. 32 * David S. Miller : New socket lookup architecture. 33 * 34 * This program is free software; you can redistribute it and/or 35 * modify it under the terms of the GNU General Public License 36 * as published by the Free Software Foundation; either version 37 * 2 of the License, or (at your option) any later version. 38 */ 39 40 #include <linux/types.h> 41 #include <linux/atomic.h> 42 #include <asm/byteorder.h> 43 #include <asm/current.h> 44 #include <linux/uaccess.h> 45 #include <asm/ioctls.h> 46 #include <linux/stddef.h> 47 #include <linux/slab.h> 48 #include <linux/errno.h> 49 #include <linux/kernel.h> 50 #include <linux/export.h> 51 #include <linux/spinlock.h> 52 #include <linux/sockios.h> 53 #include <linux/socket.h> 54 #include <linux/in.h> 55 #include <linux/mroute.h> 56 #include <linux/netdevice.h> 57 #include <linux/in_route.h> 58 #include <linux/route.h> 59 #include <linux/skbuff.h> 60 #include <linux/igmp.h> 61 #include <net/net_namespace.h> 62 #include <net/dst.h> 63 #include <net/sock.h> 64 #include <linux/ip.h> 65 #include <linux/net.h> 66 #include <net/ip.h> 67 #include <net/icmp.h> 68 #include <net/udp.h> 69 #include <net/raw.h> 70 #include <net/snmp.h> 71 #include <net/tcp_states.h> 72 #include <net/inet_common.h> 73 #include <net/checksum.h> 74 #include <net/xfrm.h> 75 #include <linux/rtnetlink.h> 76 #include <linux/proc_fs.h> 77 #include <linux/seq_file.h> 78 #include <linux/netfilter.h> 79 #include <linux/netfilter_ipv4.h> 80 #include <linux/compat.h> 81 #include <linux/uio.h> 82 83 struct raw_frag_vec { 84 struct msghdr *msg; 85 union { 86 struct icmphdr icmph; 87 char c[1]; 88 } hdr; 89 int hlen; 90 }; 91 92 struct raw_hashinfo raw_v4_hashinfo = { 93 .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), 94 }; 95 EXPORT_SYMBOL_GPL(raw_v4_hashinfo); 96 97 int raw_hash_sk(struct sock *sk) 98 { 99 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 100 struct hlist_head *head; 101 102 head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)]; 103 104 write_lock_bh(&h->lock); 105 sk_add_node(sk, head); 106 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); 107 write_unlock_bh(&h->lock); 108 109 return 0; 110 } 111 EXPORT_SYMBOL_GPL(raw_hash_sk); 112 113 void raw_unhash_sk(struct sock *sk) 114 { 115 struct raw_hashinfo *h = sk->sk_prot->h.raw_hash; 116 117 write_lock_bh(&h->lock); 118 if (sk_del_node_init(sk)) 119 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); 120 write_unlock_bh(&h->lock); 121 } 122 EXPORT_SYMBOL_GPL(raw_unhash_sk); 123 124 struct sock *__raw_v4_lookup(struct net *net, struct sock *sk, 125 unsigned short num, __be32 raddr, __be32 laddr, int dif) 126 { 127 sk_for_each_from(sk) { 128 struct inet_sock *inet = inet_sk(sk); 129 130 if (net_eq(sock_net(sk), net) && inet->inet_num == num && 131 !(inet->inet_daddr && inet->inet_daddr != raddr) && 132 !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) && 133 !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) 134 goto found; /* gotcha */ 135 } 136 sk = NULL; 137 found: 138 return sk; 139 } 140 EXPORT_SYMBOL_GPL(__raw_v4_lookup); 141 142 /* 143 * 0 - deliver 144 * 1 - block 145 */ 146 static int icmp_filter(const struct sock *sk, const struct sk_buff *skb) 147 { 148 struct icmphdr _hdr; 149 const struct icmphdr *hdr; 150 151 hdr = skb_header_pointer(skb, skb_transport_offset(skb), 152 sizeof(_hdr), &_hdr); 153 if (!hdr) 154 return 1; 155 156 if (hdr->type < 32) { 157 __u32 data = raw_sk(sk)->filter.data; 158 159 return ((1U << hdr->type) & data) != 0; 160 } 161 162 /* Do not block unknown ICMP types */ 163 return 0; 164 } 165 166 /* IP input processing comes here for RAW socket delivery. 167 * Caller owns SKB, so we must make clones. 168 * 169 * RFC 1122: SHOULD pass TOS value up to the transport layer. 170 * -> It does. And not only TOS, but all IP header. 171 */ 172 static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash) 173 { 174 struct sock *sk; 175 struct hlist_head *head; 176 int delivered = 0; 177 struct net *net; 178 179 read_lock(&raw_v4_hashinfo.lock); 180 head = &raw_v4_hashinfo.ht[hash]; 181 if (hlist_empty(head)) 182 goto out; 183 184 net = dev_net(skb->dev); 185 sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol, 186 iph->saddr, iph->daddr, 187 skb->dev->ifindex); 188 189 while (sk) { 190 delivered = 1; 191 if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) && 192 ip_mc_sf_allow(sk, iph->daddr, iph->saddr, 193 skb->dev->ifindex)) { 194 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC); 195 196 /* Not releasing hash table! */ 197 if (clone) 198 raw_rcv(sk, clone); 199 } 200 sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol, 201 iph->saddr, iph->daddr, 202 skb->dev->ifindex); 203 } 204 out: 205 read_unlock(&raw_v4_hashinfo.lock); 206 return delivered; 207 } 208 209 int raw_local_deliver(struct sk_buff *skb, int protocol) 210 { 211 int hash; 212 struct sock *raw_sk; 213 214 hash = protocol & (RAW_HTABLE_SIZE - 1); 215 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 216 217 /* If there maybe a raw socket we must check - if not we 218 * don't care less 219 */ 220 if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash)) 221 raw_sk = NULL; 222 223 return raw_sk != NULL; 224 225 } 226 227 static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info) 228 { 229 struct inet_sock *inet = inet_sk(sk); 230 const int type = icmp_hdr(skb)->type; 231 const int code = icmp_hdr(skb)->code; 232 int err = 0; 233 int harderr = 0; 234 235 if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) 236 ipv4_sk_update_pmtu(skb, sk, info); 237 else if (type == ICMP_REDIRECT) { 238 ipv4_sk_redirect(skb, sk); 239 return; 240 } 241 242 /* Report error on raw socket, if: 243 1. User requested ip_recverr. 244 2. Socket is connected (otherwise the error indication 245 is useless without ip_recverr and error is hard. 246 */ 247 if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED) 248 return; 249 250 switch (type) { 251 default: 252 case ICMP_TIME_EXCEEDED: 253 err = EHOSTUNREACH; 254 break; 255 case ICMP_SOURCE_QUENCH: 256 return; 257 case ICMP_PARAMETERPROB: 258 err = EPROTO; 259 harderr = 1; 260 break; 261 case ICMP_DEST_UNREACH: 262 err = EHOSTUNREACH; 263 if (code > NR_ICMP_UNREACH) 264 break; 265 err = icmp_err_convert[code].errno; 266 harderr = icmp_err_convert[code].fatal; 267 if (code == ICMP_FRAG_NEEDED) { 268 harderr = inet->pmtudisc != IP_PMTUDISC_DONT; 269 err = EMSGSIZE; 270 } 271 } 272 273 if (inet->recverr) { 274 const struct iphdr *iph = (const struct iphdr *)skb->data; 275 u8 *payload = skb->data + (iph->ihl << 2); 276 277 if (inet->hdrincl) 278 payload = skb->data; 279 ip_icmp_error(sk, skb, err, 0, info, payload); 280 } 281 282 if (inet->recverr || harderr) { 283 sk->sk_err = err; 284 sk->sk_error_report(sk); 285 } 286 } 287 288 void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info) 289 { 290 int hash; 291 struct sock *raw_sk; 292 const struct iphdr *iph; 293 struct net *net; 294 295 hash = protocol & (RAW_HTABLE_SIZE - 1); 296 297 read_lock(&raw_v4_hashinfo.lock); 298 raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]); 299 if (raw_sk) { 300 iph = (const struct iphdr *)skb->data; 301 net = dev_net(skb->dev); 302 303 while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol, 304 iph->daddr, iph->saddr, 305 skb->dev->ifindex)) != NULL) { 306 raw_err(raw_sk, skb, info); 307 raw_sk = sk_next(raw_sk); 308 iph = (const struct iphdr *)skb->data; 309 } 310 } 311 read_unlock(&raw_v4_hashinfo.lock); 312 } 313 314 static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb) 315 { 316 /* Charge it to the socket. */ 317 318 ipv4_pktinfo_prepare(sk, skb); 319 if (sock_queue_rcv_skb(sk, skb) < 0) { 320 kfree_skb(skb); 321 return NET_RX_DROP; 322 } 323 324 return NET_RX_SUCCESS; 325 } 326 327 int raw_rcv(struct sock *sk, struct sk_buff *skb) 328 { 329 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) { 330 atomic_inc(&sk->sk_drops); 331 kfree_skb(skb); 332 return NET_RX_DROP; 333 } 334 nf_reset(skb); 335 336 skb_push(skb, skb->data - skb_network_header(skb)); 337 338 raw_rcv_skb(sk, skb); 339 return 0; 340 } 341 342 static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4, 343 struct msghdr *msg, size_t length, 344 struct rtable **rtp, unsigned int flags, 345 const struct sockcm_cookie *sockc) 346 { 347 struct inet_sock *inet = inet_sk(sk); 348 struct net *net = sock_net(sk); 349 struct iphdr *iph; 350 struct sk_buff *skb; 351 unsigned int iphlen; 352 int err; 353 struct rtable *rt = *rtp; 354 int hlen, tlen; 355 356 if (length > rt->dst.dev->mtu) { 357 ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport, 358 rt->dst.dev->mtu); 359 return -EMSGSIZE; 360 } 361 if (flags&MSG_PROBE) 362 goto out; 363 364 hlen = LL_RESERVED_SPACE(rt->dst.dev); 365 tlen = rt->dst.dev->needed_tailroom; 366 skb = sock_alloc_send_skb(sk, 367 length + hlen + tlen + 15, 368 flags & MSG_DONTWAIT, &err); 369 if (!skb) 370 goto error; 371 skb_reserve(skb, hlen); 372 373 skb->priority = sk->sk_priority; 374 skb->mark = sk->sk_mark; 375 skb_dst_set(skb, &rt->dst); 376 *rtp = NULL; 377 378 skb_reset_network_header(skb); 379 iph = ip_hdr(skb); 380 skb_put(skb, length); 381 382 skb->ip_summed = CHECKSUM_NONE; 383 384 sock_tx_timestamp(sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags); 385 386 skb->transport_header = skb->network_header; 387 err = -EFAULT; 388 if (memcpy_from_msg(iph, msg, length)) 389 goto error_free; 390 391 iphlen = iph->ihl * 4; 392 393 /* 394 * We don't want to modify the ip header, but we do need to 395 * be sure that it won't cause problems later along the network 396 * stack. Specifically we want to make sure that iph->ihl is a 397 * sane value. If ihl points beyond the length of the buffer passed 398 * in, reject the frame as invalid 399 */ 400 err = -EINVAL; 401 if (iphlen > length) 402 goto error_free; 403 404 if (iphlen >= sizeof(*iph)) { 405 if (!iph->saddr) 406 iph->saddr = fl4->saddr; 407 iph->check = 0; 408 iph->tot_len = htons(length); 409 if (!iph->id) 410 ip_select_ident(net, skb, NULL); 411 412 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 413 skb->transport_header += iphlen; 414 if (iph->protocol == IPPROTO_ICMP && 415 length >= iphlen + sizeof(struct icmphdr)) 416 icmp_out_count(net, ((struct icmphdr *) 417 skb_transport_header(skb))->type); 418 } 419 420 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, 421 net, sk, skb, NULL, rt->dst.dev, 422 dst_output); 423 if (err > 0) 424 err = net_xmit_errno(err); 425 if (err) 426 goto error; 427 out: 428 return 0; 429 430 error_free: 431 kfree_skb(skb); 432 error: 433 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 434 if (err == -ENOBUFS && !inet->recverr) 435 err = 0; 436 return err; 437 } 438 439 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) 440 { 441 int err; 442 443 if (fl4->flowi4_proto != IPPROTO_ICMP) 444 return 0; 445 446 /* We only need the first two bytes. */ 447 rfv->hlen = 2; 448 449 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); 450 if (err) 451 return err; 452 453 fl4->fl4_icmp_type = rfv->hdr.icmph.type; 454 fl4->fl4_icmp_code = rfv->hdr.icmph.code; 455 456 return 0; 457 } 458 459 static int raw_getfrag(void *from, char *to, int offset, int len, int odd, 460 struct sk_buff *skb) 461 { 462 struct raw_frag_vec *rfv = from; 463 464 if (offset < rfv->hlen) { 465 int copy = min(rfv->hlen - offset, len); 466 467 if (skb->ip_summed == CHECKSUM_PARTIAL) 468 memcpy(to, rfv->hdr.c + offset, copy); 469 else 470 skb->csum = csum_block_add( 471 skb->csum, 472 csum_partial_copy_nocheck(rfv->hdr.c + offset, 473 to, copy, 0), 474 odd); 475 476 odd = 0; 477 offset += copy; 478 to += copy; 479 len -= copy; 480 481 if (!len) 482 return 0; 483 } 484 485 offset -= rfv->hlen; 486 487 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 488 } 489 490 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 491 { 492 struct inet_sock *inet = inet_sk(sk); 493 struct net *net = sock_net(sk); 494 struct ipcm_cookie ipc; 495 struct rtable *rt = NULL; 496 struct flowi4 fl4; 497 int free = 0; 498 __be32 daddr; 499 __be32 saddr; 500 u8 tos; 501 int err; 502 struct ip_options_data opt_copy; 503 struct raw_frag_vec rfv; 504 505 err = -EMSGSIZE; 506 if (len > 0xFFFF) 507 goto out; 508 509 /* 510 * Check the flags. 511 */ 512 513 err = -EOPNOTSUPP; 514 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 515 goto out; /* compatibility */ 516 517 /* 518 * Get and verify the address. 519 */ 520 521 if (msg->msg_namelen) { 522 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); 523 err = -EINVAL; 524 if (msg->msg_namelen < sizeof(*usin)) 525 goto out; 526 if (usin->sin_family != AF_INET) { 527 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", 528 __func__, current->comm); 529 err = -EAFNOSUPPORT; 530 if (usin->sin_family) 531 goto out; 532 } 533 daddr = usin->sin_addr.s_addr; 534 /* ANK: I did not forget to get protocol from port field. 535 * I just do not know, who uses this weirdness. 536 * IP_HDRINCL is much more convenient. 537 */ 538 } else { 539 err = -EDESTADDRREQ; 540 if (sk->sk_state != TCP_ESTABLISHED) 541 goto out; 542 daddr = inet->inet_daddr; 543 } 544 545 ipc.sockc.tsflags = sk->sk_tsflags; 546 ipc.addr = inet->inet_saddr; 547 ipc.opt = NULL; 548 ipc.tx_flags = 0; 549 ipc.ttl = 0; 550 ipc.tos = -1; 551 ipc.oif = sk->sk_bound_dev_if; 552 553 if (msg->msg_controllen) { 554 err = ip_cmsg_send(sk, msg, &ipc, false); 555 if (unlikely(err)) { 556 kfree(ipc.opt); 557 goto out; 558 } 559 if (ipc.opt) 560 free = 1; 561 } 562 563 saddr = ipc.addr; 564 ipc.addr = daddr; 565 566 if (!ipc.opt) { 567 struct ip_options_rcu *inet_opt; 568 569 rcu_read_lock(); 570 inet_opt = rcu_dereference(inet->inet_opt); 571 if (inet_opt) { 572 memcpy(&opt_copy, inet_opt, 573 sizeof(*inet_opt) + inet_opt->opt.optlen); 574 ipc.opt = &opt_copy.opt; 575 } 576 rcu_read_unlock(); 577 } 578 579 if (ipc.opt) { 580 err = -EINVAL; 581 /* Linux does not mangle headers on raw sockets, 582 * so that IP options + IP_HDRINCL is non-sense. 583 */ 584 if (inet->hdrincl) 585 goto done; 586 if (ipc.opt->opt.srr) { 587 if (!daddr) 588 goto done; 589 daddr = ipc.opt->opt.faddr; 590 } 591 } 592 tos = get_rtconn_flags(&ipc, sk); 593 if (msg->msg_flags & MSG_DONTROUTE) 594 tos |= RTO_ONLINK; 595 596 if (ipv4_is_multicast(daddr)) { 597 if (!ipc.oif) 598 ipc.oif = inet->mc_index; 599 if (!saddr) 600 saddr = inet->mc_addr; 601 } else if (!ipc.oif) 602 ipc.oif = inet->uc_index; 603 604 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, 605 RT_SCOPE_UNIVERSE, 606 inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, 607 inet_sk_flowi_flags(sk) | 608 (inet->hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 609 daddr, saddr, 0, 0, sk->sk_uid); 610 611 if (!inet->hdrincl) { 612 rfv.msg = msg; 613 rfv.hlen = 0; 614 615 err = raw_probe_proto_opt(&rfv, &fl4); 616 if (err) 617 goto done; 618 } 619 620 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); 621 rt = ip_route_output_flow(net, &fl4, sk); 622 if (IS_ERR(rt)) { 623 err = PTR_ERR(rt); 624 rt = NULL; 625 goto done; 626 } 627 628 err = -EACCES; 629 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 630 goto done; 631 632 if (msg->msg_flags & MSG_CONFIRM) 633 goto do_confirm; 634 back_from_confirm: 635 636 if (inet->hdrincl) 637 err = raw_send_hdrinc(sk, &fl4, msg, len, 638 &rt, msg->msg_flags, &ipc.sockc); 639 640 else { 641 sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags); 642 643 if (!ipc.addr) 644 ipc.addr = fl4.daddr; 645 lock_sock(sk); 646 err = ip_append_data(sk, &fl4, raw_getfrag, 647 &rfv, len, 0, 648 &ipc, &rt, msg->msg_flags); 649 if (err) 650 ip_flush_pending_frames(sk); 651 else if (!(msg->msg_flags & MSG_MORE)) { 652 err = ip_push_pending_frames(sk, &fl4); 653 if (err == -ENOBUFS && !inet->recverr) 654 err = 0; 655 } 656 release_sock(sk); 657 } 658 done: 659 if (free) 660 kfree(ipc.opt); 661 ip_rt_put(rt); 662 663 out: 664 if (err < 0) 665 return err; 666 return len; 667 668 do_confirm: 669 dst_confirm(&rt->dst); 670 if (!(msg->msg_flags & MSG_PROBE) || len) 671 goto back_from_confirm; 672 err = 0; 673 goto done; 674 } 675 676 static void raw_close(struct sock *sk, long timeout) 677 { 678 /* 679 * Raw sockets may have direct kernel references. Kill them. 680 */ 681 ip_ra_control(sk, 0, NULL); 682 683 sk_common_release(sk); 684 } 685 686 static void raw_destroy(struct sock *sk) 687 { 688 lock_sock(sk); 689 ip_flush_pending_frames(sk); 690 release_sock(sk); 691 } 692 693 /* This gets rid of all the nasties in af_inet. -DaveM */ 694 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 695 { 696 struct inet_sock *inet = inet_sk(sk); 697 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 698 u32 tb_id = RT_TABLE_LOCAL; 699 int ret = -EINVAL; 700 int chk_addr_ret; 701 702 if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in)) 703 goto out; 704 705 if (sk->sk_bound_dev_if) 706 tb_id = l3mdev_fib_table_by_index(sock_net(sk), 707 sk->sk_bound_dev_if) ? : tb_id; 708 709 chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr, 710 tb_id); 711 712 ret = -EADDRNOTAVAIL; 713 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 714 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 715 goto out; 716 inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr; 717 if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST) 718 inet->inet_saddr = 0; /* Use device */ 719 sk_dst_reset(sk); 720 ret = 0; 721 out: return ret; 722 } 723 724 /* 725 * This should be easy, if there is something there 726 * we return it, otherwise we block. 727 */ 728 729 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 730 int noblock, int flags, int *addr_len) 731 { 732 struct inet_sock *inet = inet_sk(sk); 733 size_t copied = 0; 734 int err = -EOPNOTSUPP; 735 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 736 struct sk_buff *skb; 737 738 if (flags & MSG_OOB) 739 goto out; 740 741 if (flags & MSG_ERRQUEUE) { 742 err = ip_recv_error(sk, msg, len, addr_len); 743 goto out; 744 } 745 746 skb = skb_recv_datagram(sk, flags, noblock, &err); 747 if (!skb) 748 goto out; 749 750 copied = skb->len; 751 if (len < copied) { 752 msg->msg_flags |= MSG_TRUNC; 753 copied = len; 754 } 755 756 err = skb_copy_datagram_msg(skb, 0, msg, copied); 757 if (err) 758 goto done; 759 760 sock_recv_ts_and_drops(msg, sk, skb); 761 762 /* Copy the address. */ 763 if (sin) { 764 sin->sin_family = AF_INET; 765 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 766 sin->sin_port = 0; 767 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 768 *addr_len = sizeof(*sin); 769 } 770 if (inet->cmsg_flags) 771 ip_cmsg_recv(msg, skb); 772 if (flags & MSG_TRUNC) 773 copied = skb->len; 774 done: 775 skb_free_datagram(sk, skb); 776 out: 777 if (err) 778 return err; 779 return copied; 780 } 781 782 static int raw_init(struct sock *sk) 783 { 784 struct raw_sock *rp = raw_sk(sk); 785 786 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 787 memset(&rp->filter, 0, sizeof(rp->filter)); 788 return 0; 789 } 790 791 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 792 { 793 if (optlen > sizeof(struct icmp_filter)) 794 optlen = sizeof(struct icmp_filter); 795 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 796 return -EFAULT; 797 return 0; 798 } 799 800 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 801 { 802 int len, ret = -EFAULT; 803 804 if (get_user(len, optlen)) 805 goto out; 806 ret = -EINVAL; 807 if (len < 0) 808 goto out; 809 if (len > sizeof(struct icmp_filter)) 810 len = sizeof(struct icmp_filter); 811 ret = -EFAULT; 812 if (put_user(len, optlen) || 813 copy_to_user(optval, &raw_sk(sk)->filter, len)) 814 goto out; 815 ret = 0; 816 out: return ret; 817 } 818 819 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 820 char __user *optval, unsigned int optlen) 821 { 822 if (optname == ICMP_FILTER) { 823 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 824 return -EOPNOTSUPP; 825 else 826 return raw_seticmpfilter(sk, optval, optlen); 827 } 828 return -ENOPROTOOPT; 829 } 830 831 static int raw_setsockopt(struct sock *sk, int level, int optname, 832 char __user *optval, unsigned int optlen) 833 { 834 if (level != SOL_RAW) 835 return ip_setsockopt(sk, level, optname, optval, optlen); 836 return do_raw_setsockopt(sk, level, optname, optval, optlen); 837 } 838 839 #ifdef CONFIG_COMPAT 840 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 841 char __user *optval, unsigned int optlen) 842 { 843 if (level != SOL_RAW) 844 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 845 return do_raw_setsockopt(sk, level, optname, optval, optlen); 846 } 847 #endif 848 849 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 850 char __user *optval, int __user *optlen) 851 { 852 if (optname == ICMP_FILTER) { 853 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 854 return -EOPNOTSUPP; 855 else 856 return raw_geticmpfilter(sk, optval, optlen); 857 } 858 return -ENOPROTOOPT; 859 } 860 861 static int raw_getsockopt(struct sock *sk, int level, int optname, 862 char __user *optval, int __user *optlen) 863 { 864 if (level != SOL_RAW) 865 return ip_getsockopt(sk, level, optname, optval, optlen); 866 return do_raw_getsockopt(sk, level, optname, optval, optlen); 867 } 868 869 #ifdef CONFIG_COMPAT 870 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 871 char __user *optval, int __user *optlen) 872 { 873 if (level != SOL_RAW) 874 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 875 return do_raw_getsockopt(sk, level, optname, optval, optlen); 876 } 877 #endif 878 879 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 880 { 881 switch (cmd) { 882 case SIOCOUTQ: { 883 int amount = sk_wmem_alloc_get(sk); 884 885 return put_user(amount, (int __user *)arg); 886 } 887 case SIOCINQ: { 888 struct sk_buff *skb; 889 int amount = 0; 890 891 spin_lock_bh(&sk->sk_receive_queue.lock); 892 skb = skb_peek(&sk->sk_receive_queue); 893 if (skb) 894 amount = skb->len; 895 spin_unlock_bh(&sk->sk_receive_queue.lock); 896 return put_user(amount, (int __user *)arg); 897 } 898 899 default: 900 #ifdef CONFIG_IP_MROUTE 901 return ipmr_ioctl(sk, cmd, (void __user *)arg); 902 #else 903 return -ENOIOCTLCMD; 904 #endif 905 } 906 } 907 908 #ifdef CONFIG_COMPAT 909 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 910 { 911 switch (cmd) { 912 case SIOCOUTQ: 913 case SIOCINQ: 914 return -ENOIOCTLCMD; 915 default: 916 #ifdef CONFIG_IP_MROUTE 917 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 918 #else 919 return -ENOIOCTLCMD; 920 #endif 921 } 922 } 923 #endif 924 925 int raw_abort(struct sock *sk, int err) 926 { 927 lock_sock(sk); 928 929 sk->sk_err = err; 930 sk->sk_error_report(sk); 931 __udp_disconnect(sk, 0); 932 933 release_sock(sk); 934 935 return 0; 936 } 937 EXPORT_SYMBOL_GPL(raw_abort); 938 939 struct proto raw_prot = { 940 .name = "RAW", 941 .owner = THIS_MODULE, 942 .close = raw_close, 943 .destroy = raw_destroy, 944 .connect = ip4_datagram_connect, 945 .disconnect = __udp_disconnect, 946 .ioctl = raw_ioctl, 947 .init = raw_init, 948 .setsockopt = raw_setsockopt, 949 .getsockopt = raw_getsockopt, 950 .sendmsg = raw_sendmsg, 951 .recvmsg = raw_recvmsg, 952 .bind = raw_bind, 953 .backlog_rcv = raw_rcv_skb, 954 .release_cb = ip4_datagram_release_cb, 955 .hash = raw_hash_sk, 956 .unhash = raw_unhash_sk, 957 .obj_size = sizeof(struct raw_sock), 958 .h.raw_hash = &raw_v4_hashinfo, 959 #ifdef CONFIG_COMPAT 960 .compat_setsockopt = compat_raw_setsockopt, 961 .compat_getsockopt = compat_raw_getsockopt, 962 .compat_ioctl = compat_raw_ioctl, 963 #endif 964 .diag_destroy = raw_abort, 965 }; 966 967 #ifdef CONFIG_PROC_FS 968 static struct sock *raw_get_first(struct seq_file *seq) 969 { 970 struct sock *sk; 971 struct raw_iter_state *state = raw_seq_private(seq); 972 973 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; 974 ++state->bucket) { 975 sk_for_each(sk, &state->h->ht[state->bucket]) 976 if (sock_net(sk) == seq_file_net(seq)) 977 goto found; 978 } 979 sk = NULL; 980 found: 981 return sk; 982 } 983 984 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 985 { 986 struct raw_iter_state *state = raw_seq_private(seq); 987 988 do { 989 sk = sk_next(sk); 990 try_again: 991 ; 992 } while (sk && sock_net(sk) != seq_file_net(seq)); 993 994 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { 995 sk = sk_head(&state->h->ht[state->bucket]); 996 goto try_again; 997 } 998 return sk; 999 } 1000 1001 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 1002 { 1003 struct sock *sk = raw_get_first(seq); 1004 1005 if (sk) 1006 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 1007 --pos; 1008 return pos ? NULL : sk; 1009 } 1010 1011 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 1012 { 1013 struct raw_iter_state *state = raw_seq_private(seq); 1014 1015 read_lock(&state->h->lock); 1016 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1017 } 1018 EXPORT_SYMBOL_GPL(raw_seq_start); 1019 1020 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1021 { 1022 struct sock *sk; 1023 1024 if (v == SEQ_START_TOKEN) 1025 sk = raw_get_first(seq); 1026 else 1027 sk = raw_get_next(seq, v); 1028 ++*pos; 1029 return sk; 1030 } 1031 EXPORT_SYMBOL_GPL(raw_seq_next); 1032 1033 void raw_seq_stop(struct seq_file *seq, void *v) 1034 { 1035 struct raw_iter_state *state = raw_seq_private(seq); 1036 1037 read_unlock(&state->h->lock); 1038 } 1039 EXPORT_SYMBOL_GPL(raw_seq_stop); 1040 1041 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1042 { 1043 struct inet_sock *inet = inet_sk(sp); 1044 __be32 dest = inet->inet_daddr, 1045 src = inet->inet_rcv_saddr; 1046 __u16 destp = 0, 1047 srcp = inet->inet_num; 1048 1049 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1050 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 1051 i, src, srcp, dest, destp, sp->sk_state, 1052 sk_wmem_alloc_get(sp), 1053 sk_rmem_alloc_get(sp), 1054 0, 0L, 0, 1055 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1056 0, sock_i_ino(sp), 1057 atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1058 } 1059 1060 static int raw_seq_show(struct seq_file *seq, void *v) 1061 { 1062 if (v == SEQ_START_TOKEN) 1063 seq_printf(seq, " sl local_address rem_address st tx_queue " 1064 "rx_queue tr tm->when retrnsmt uid timeout " 1065 "inode ref pointer drops\n"); 1066 else 1067 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1068 return 0; 1069 } 1070 1071 static const struct seq_operations raw_seq_ops = { 1072 .start = raw_seq_start, 1073 .next = raw_seq_next, 1074 .stop = raw_seq_stop, 1075 .show = raw_seq_show, 1076 }; 1077 1078 int raw_seq_open(struct inode *ino, struct file *file, 1079 struct raw_hashinfo *h, const struct seq_operations *ops) 1080 { 1081 int err; 1082 struct raw_iter_state *i; 1083 1084 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state)); 1085 if (err < 0) 1086 return err; 1087 1088 i = raw_seq_private((struct seq_file *)file->private_data); 1089 i->h = h; 1090 return 0; 1091 } 1092 EXPORT_SYMBOL_GPL(raw_seq_open); 1093 1094 static int raw_v4_seq_open(struct inode *inode, struct file *file) 1095 { 1096 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops); 1097 } 1098 1099 static const struct file_operations raw_seq_fops = { 1100 .owner = THIS_MODULE, 1101 .open = raw_v4_seq_open, 1102 .read = seq_read, 1103 .llseek = seq_lseek, 1104 .release = seq_release_net, 1105 }; 1106 1107 static __net_init int raw_init_net(struct net *net) 1108 { 1109 if (!proc_create("raw", S_IRUGO, net->proc_net, &raw_seq_fops)) 1110 return -ENOMEM; 1111 1112 return 0; 1113 } 1114 1115 static __net_exit void raw_exit_net(struct net *net) 1116 { 1117 remove_proc_entry("raw", net->proc_net); 1118 } 1119 1120 static __net_initdata struct pernet_operations raw_net_ops = { 1121 .init = raw_init_net, 1122 .exit = raw_exit_net, 1123 }; 1124 1125 int __init raw_proc_init(void) 1126 { 1127 return register_pernet_subsys(&raw_net_ops); 1128 } 1129 1130 void __init raw_proc_exit(void) 1131 { 1132 unregister_pernet_subsys(&raw_net_ops); 1133 } 1134 #endif /* CONFIG_PROC_FS */ 1135