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 (length < sizeof(struct iphdr)) 362 return -EINVAL; 363 364 if (flags&MSG_PROBE) 365 goto out; 366 367 hlen = LL_RESERVED_SPACE(rt->dst.dev); 368 tlen = rt->dst.dev->needed_tailroom; 369 skb = sock_alloc_send_skb(sk, 370 length + hlen + tlen + 15, 371 flags & MSG_DONTWAIT, &err); 372 if (!skb) 373 goto error; 374 skb_reserve(skb, hlen); 375 376 skb->priority = sk->sk_priority; 377 skb->mark = sk->sk_mark; 378 skb_dst_set(skb, &rt->dst); 379 *rtp = NULL; 380 381 skb_reset_network_header(skb); 382 iph = ip_hdr(skb); 383 skb_put(skb, length); 384 385 skb->ip_summed = CHECKSUM_NONE; 386 387 sock_tx_timestamp(sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags); 388 389 if (flags & MSG_CONFIRM) 390 skb_set_dst_pending_confirm(skb, 1); 391 392 skb->transport_header = skb->network_header; 393 err = -EFAULT; 394 if (memcpy_from_msg(iph, msg, length)) 395 goto error_free; 396 397 iphlen = iph->ihl * 4; 398 399 /* 400 * We don't want to modify the ip header, but we do need to 401 * be sure that it won't cause problems later along the network 402 * stack. Specifically we want to make sure that iph->ihl is a 403 * sane value. If ihl points beyond the length of the buffer passed 404 * in, reject the frame as invalid 405 */ 406 err = -EINVAL; 407 if (iphlen > length) 408 goto error_free; 409 410 if (iphlen >= sizeof(*iph)) { 411 if (!iph->saddr) 412 iph->saddr = fl4->saddr; 413 iph->check = 0; 414 iph->tot_len = htons(length); 415 if (!iph->id) 416 ip_select_ident(net, skb, NULL); 417 418 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); 419 skb->transport_header += iphlen; 420 if (iph->protocol == IPPROTO_ICMP && 421 length >= iphlen + sizeof(struct icmphdr)) 422 icmp_out_count(net, ((struct icmphdr *) 423 skb_transport_header(skb))->type); 424 } 425 426 err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, 427 net, sk, skb, NULL, rt->dst.dev, 428 dst_output); 429 if (err > 0) 430 err = net_xmit_errno(err); 431 if (err) 432 goto error; 433 out: 434 return 0; 435 436 error_free: 437 kfree_skb(skb); 438 error: 439 IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS); 440 if (err == -ENOBUFS && !inet->recverr) 441 err = 0; 442 return err; 443 } 444 445 static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) 446 { 447 int err; 448 449 if (fl4->flowi4_proto != IPPROTO_ICMP) 450 return 0; 451 452 /* We only need the first two bytes. */ 453 rfv->hlen = 2; 454 455 err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen); 456 if (err) 457 return err; 458 459 fl4->fl4_icmp_type = rfv->hdr.icmph.type; 460 fl4->fl4_icmp_code = rfv->hdr.icmph.code; 461 462 return 0; 463 } 464 465 static int raw_getfrag(void *from, char *to, int offset, int len, int odd, 466 struct sk_buff *skb) 467 { 468 struct raw_frag_vec *rfv = from; 469 470 if (offset < rfv->hlen) { 471 int copy = min(rfv->hlen - offset, len); 472 473 if (skb->ip_summed == CHECKSUM_PARTIAL) 474 memcpy(to, rfv->hdr.c + offset, copy); 475 else 476 skb->csum = csum_block_add( 477 skb->csum, 478 csum_partial_copy_nocheck(rfv->hdr.c + offset, 479 to, copy, 0), 480 odd); 481 482 odd = 0; 483 offset += copy; 484 to += copy; 485 len -= copy; 486 487 if (!len) 488 return 0; 489 } 490 491 offset -= rfv->hlen; 492 493 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb); 494 } 495 496 static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) 497 { 498 struct inet_sock *inet = inet_sk(sk); 499 struct net *net = sock_net(sk); 500 struct ipcm_cookie ipc; 501 struct rtable *rt = NULL; 502 struct flowi4 fl4; 503 int free = 0; 504 __be32 daddr; 505 __be32 saddr; 506 u8 tos; 507 int err; 508 struct ip_options_data opt_copy; 509 struct raw_frag_vec rfv; 510 511 err = -EMSGSIZE; 512 if (len > 0xFFFF) 513 goto out; 514 515 /* 516 * Check the flags. 517 */ 518 519 err = -EOPNOTSUPP; 520 if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message */ 521 goto out; /* compatibility */ 522 523 /* 524 * Get and verify the address. 525 */ 526 527 if (msg->msg_namelen) { 528 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); 529 err = -EINVAL; 530 if (msg->msg_namelen < sizeof(*usin)) 531 goto out; 532 if (usin->sin_family != AF_INET) { 533 pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n", 534 __func__, current->comm); 535 err = -EAFNOSUPPORT; 536 if (usin->sin_family) 537 goto out; 538 } 539 daddr = usin->sin_addr.s_addr; 540 /* ANK: I did not forget to get protocol from port field. 541 * I just do not know, who uses this weirdness. 542 * IP_HDRINCL is much more convenient. 543 */ 544 } else { 545 err = -EDESTADDRREQ; 546 if (sk->sk_state != TCP_ESTABLISHED) 547 goto out; 548 daddr = inet->inet_daddr; 549 } 550 551 ipc.sockc.tsflags = sk->sk_tsflags; 552 ipc.addr = inet->inet_saddr; 553 ipc.opt = NULL; 554 ipc.tx_flags = 0; 555 ipc.ttl = 0; 556 ipc.tos = -1; 557 ipc.oif = sk->sk_bound_dev_if; 558 559 if (msg->msg_controllen) { 560 err = ip_cmsg_send(sk, msg, &ipc, false); 561 if (unlikely(err)) { 562 kfree(ipc.opt); 563 goto out; 564 } 565 if (ipc.opt) 566 free = 1; 567 } 568 569 saddr = ipc.addr; 570 ipc.addr = daddr; 571 572 if (!ipc.opt) { 573 struct ip_options_rcu *inet_opt; 574 575 rcu_read_lock(); 576 inet_opt = rcu_dereference(inet->inet_opt); 577 if (inet_opt) { 578 memcpy(&opt_copy, inet_opt, 579 sizeof(*inet_opt) + inet_opt->opt.optlen); 580 ipc.opt = &opt_copy.opt; 581 } 582 rcu_read_unlock(); 583 } 584 585 if (ipc.opt) { 586 err = -EINVAL; 587 /* Linux does not mangle headers on raw sockets, 588 * so that IP options + IP_HDRINCL is non-sense. 589 */ 590 if (inet->hdrincl) 591 goto done; 592 if (ipc.opt->opt.srr) { 593 if (!daddr) 594 goto done; 595 daddr = ipc.opt->opt.faddr; 596 } 597 } 598 tos = get_rtconn_flags(&ipc, sk); 599 if (msg->msg_flags & MSG_DONTROUTE) 600 tos |= RTO_ONLINK; 601 602 if (ipv4_is_multicast(daddr)) { 603 if (!ipc.oif) 604 ipc.oif = inet->mc_index; 605 if (!saddr) 606 saddr = inet->mc_addr; 607 } else if (!ipc.oif) 608 ipc.oif = inet->uc_index; 609 610 flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, 611 RT_SCOPE_UNIVERSE, 612 inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol, 613 inet_sk_flowi_flags(sk) | 614 (inet->hdrincl ? FLOWI_FLAG_KNOWN_NH : 0), 615 daddr, saddr, 0, 0, sk->sk_uid); 616 617 if (!inet->hdrincl) { 618 rfv.msg = msg; 619 rfv.hlen = 0; 620 621 err = raw_probe_proto_opt(&rfv, &fl4); 622 if (err) 623 goto done; 624 } 625 626 security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); 627 rt = ip_route_output_flow(net, &fl4, sk); 628 if (IS_ERR(rt)) { 629 err = PTR_ERR(rt); 630 rt = NULL; 631 goto done; 632 } 633 634 err = -EACCES; 635 if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST)) 636 goto done; 637 638 if (msg->msg_flags & MSG_CONFIRM) 639 goto do_confirm; 640 back_from_confirm: 641 642 if (inet->hdrincl) 643 err = raw_send_hdrinc(sk, &fl4, msg, len, 644 &rt, msg->msg_flags, &ipc.sockc); 645 646 else { 647 sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags); 648 649 if (!ipc.addr) 650 ipc.addr = fl4.daddr; 651 lock_sock(sk); 652 err = ip_append_data(sk, &fl4, raw_getfrag, 653 &rfv, len, 0, 654 &ipc, &rt, msg->msg_flags); 655 if (err) 656 ip_flush_pending_frames(sk); 657 else if (!(msg->msg_flags & MSG_MORE)) { 658 err = ip_push_pending_frames(sk, &fl4); 659 if (err == -ENOBUFS && !inet->recverr) 660 err = 0; 661 } 662 release_sock(sk); 663 } 664 done: 665 if (free) 666 kfree(ipc.opt); 667 ip_rt_put(rt); 668 669 out: 670 if (err < 0) 671 return err; 672 return len; 673 674 do_confirm: 675 if (msg->msg_flags & MSG_PROBE) 676 dst_confirm_neigh(&rt->dst, &fl4.daddr); 677 if (!(msg->msg_flags & MSG_PROBE) || len) 678 goto back_from_confirm; 679 err = 0; 680 goto done; 681 } 682 683 static void raw_close(struct sock *sk, long timeout) 684 { 685 /* 686 * Raw sockets may have direct kernel references. Kill them. 687 */ 688 rtnl_lock(); 689 ip_ra_control(sk, 0, NULL); 690 rtnl_unlock(); 691 692 sk_common_release(sk); 693 } 694 695 static void raw_destroy(struct sock *sk) 696 { 697 lock_sock(sk); 698 ip_flush_pending_frames(sk); 699 release_sock(sk); 700 } 701 702 /* This gets rid of all the nasties in af_inet. -DaveM */ 703 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) 704 { 705 struct inet_sock *inet = inet_sk(sk); 706 struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; 707 u32 tb_id = RT_TABLE_LOCAL; 708 int ret = -EINVAL; 709 int chk_addr_ret; 710 711 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(sock_net(sk), 716 sk->sk_bound_dev_if) ? : tb_id; 717 718 chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr, 719 tb_id); 720 721 ret = -EADDRNOTAVAIL; 722 if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL && 723 chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) 724 goto out; 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: return ret; 731 } 732 733 /* 734 * This should be easy, if there is something there 735 * we return it, otherwise we block. 736 */ 737 738 static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, 739 int noblock, int flags, int *addr_len) 740 { 741 struct inet_sock *inet = inet_sk(sk); 742 size_t copied = 0; 743 int err = -EOPNOTSUPP; 744 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); 745 struct sk_buff *skb; 746 747 if (flags & MSG_OOB) 748 goto out; 749 750 if (flags & MSG_ERRQUEUE) { 751 err = ip_recv_error(sk, msg, len, addr_len); 752 goto out; 753 } 754 755 skb = skb_recv_datagram(sk, flags, noblock, &err); 756 if (!skb) 757 goto out; 758 759 copied = skb->len; 760 if (len < copied) { 761 msg->msg_flags |= MSG_TRUNC; 762 copied = len; 763 } 764 765 err = skb_copy_datagram_msg(skb, 0, msg, copied); 766 if (err) 767 goto done; 768 769 sock_recv_ts_and_drops(msg, sk, skb); 770 771 /* Copy the address. */ 772 if (sin) { 773 sin->sin_family = AF_INET; 774 sin->sin_addr.s_addr = ip_hdr(skb)->saddr; 775 sin->sin_port = 0; 776 memset(&sin->sin_zero, 0, sizeof(sin->sin_zero)); 777 *addr_len = sizeof(*sin); 778 } 779 if (inet->cmsg_flags) 780 ip_cmsg_recv(msg, skb); 781 if (flags & MSG_TRUNC) 782 copied = skb->len; 783 done: 784 skb_free_datagram(sk, skb); 785 out: 786 if (err) 787 return err; 788 return copied; 789 } 790 791 static int raw_init(struct sock *sk) 792 { 793 struct raw_sock *rp = raw_sk(sk); 794 795 if (inet_sk(sk)->inet_num == IPPROTO_ICMP) 796 memset(&rp->filter, 0, sizeof(rp->filter)); 797 return 0; 798 } 799 800 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen) 801 { 802 if (optlen > sizeof(struct icmp_filter)) 803 optlen = sizeof(struct icmp_filter); 804 if (copy_from_user(&raw_sk(sk)->filter, optval, optlen)) 805 return -EFAULT; 806 return 0; 807 } 808 809 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen) 810 { 811 int len, ret = -EFAULT; 812 813 if (get_user(len, optlen)) 814 goto out; 815 ret = -EINVAL; 816 if (len < 0) 817 goto out; 818 if (len > sizeof(struct icmp_filter)) 819 len = sizeof(struct icmp_filter); 820 ret = -EFAULT; 821 if (put_user(len, optlen) || 822 copy_to_user(optval, &raw_sk(sk)->filter, len)) 823 goto out; 824 ret = 0; 825 out: return ret; 826 } 827 828 static int do_raw_setsockopt(struct sock *sk, int level, int optname, 829 char __user *optval, unsigned int optlen) 830 { 831 if (optname == ICMP_FILTER) { 832 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 833 return -EOPNOTSUPP; 834 else 835 return raw_seticmpfilter(sk, optval, optlen); 836 } 837 return -ENOPROTOOPT; 838 } 839 840 static int raw_setsockopt(struct sock *sk, int level, int optname, 841 char __user *optval, unsigned int optlen) 842 { 843 if (level != SOL_RAW) 844 return ip_setsockopt(sk, level, optname, optval, optlen); 845 return do_raw_setsockopt(sk, level, optname, optval, optlen); 846 } 847 848 #ifdef CONFIG_COMPAT 849 static int compat_raw_setsockopt(struct sock *sk, int level, int optname, 850 char __user *optval, unsigned int optlen) 851 { 852 if (level != SOL_RAW) 853 return compat_ip_setsockopt(sk, level, optname, optval, optlen); 854 return do_raw_setsockopt(sk, level, optname, optval, optlen); 855 } 856 #endif 857 858 static int do_raw_getsockopt(struct sock *sk, int level, int optname, 859 char __user *optval, int __user *optlen) 860 { 861 if (optname == ICMP_FILTER) { 862 if (inet_sk(sk)->inet_num != IPPROTO_ICMP) 863 return -EOPNOTSUPP; 864 else 865 return raw_geticmpfilter(sk, optval, optlen); 866 } 867 return -ENOPROTOOPT; 868 } 869 870 static int raw_getsockopt(struct sock *sk, int level, int optname, 871 char __user *optval, int __user *optlen) 872 { 873 if (level != SOL_RAW) 874 return ip_getsockopt(sk, level, optname, optval, optlen); 875 return do_raw_getsockopt(sk, level, optname, optval, optlen); 876 } 877 878 #ifdef CONFIG_COMPAT 879 static int compat_raw_getsockopt(struct sock *sk, int level, int optname, 880 char __user *optval, int __user *optlen) 881 { 882 if (level != SOL_RAW) 883 return compat_ip_getsockopt(sk, level, optname, optval, optlen); 884 return do_raw_getsockopt(sk, level, optname, optval, optlen); 885 } 886 #endif 887 888 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg) 889 { 890 switch (cmd) { 891 case SIOCOUTQ: { 892 int amount = sk_wmem_alloc_get(sk); 893 894 return put_user(amount, (int __user *)arg); 895 } 896 case SIOCINQ: { 897 struct sk_buff *skb; 898 int amount = 0; 899 900 spin_lock_bh(&sk->sk_receive_queue.lock); 901 skb = skb_peek(&sk->sk_receive_queue); 902 if (skb) 903 amount = skb->len; 904 spin_unlock_bh(&sk->sk_receive_queue.lock); 905 return put_user(amount, (int __user *)arg); 906 } 907 908 default: 909 #ifdef CONFIG_IP_MROUTE 910 return ipmr_ioctl(sk, cmd, (void __user *)arg); 911 #else 912 return -ENOIOCTLCMD; 913 #endif 914 } 915 } 916 917 #ifdef CONFIG_COMPAT 918 static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg) 919 { 920 switch (cmd) { 921 case SIOCOUTQ: 922 case SIOCINQ: 923 return -ENOIOCTLCMD; 924 default: 925 #ifdef CONFIG_IP_MROUTE 926 return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg)); 927 #else 928 return -ENOIOCTLCMD; 929 #endif 930 } 931 } 932 #endif 933 934 int raw_abort(struct sock *sk, int err) 935 { 936 lock_sock(sk); 937 938 sk->sk_err = err; 939 sk->sk_error_report(sk); 940 __udp_disconnect(sk, 0); 941 942 release_sock(sk); 943 944 return 0; 945 } 946 EXPORT_SYMBOL_GPL(raw_abort); 947 948 struct proto raw_prot = { 949 .name = "RAW", 950 .owner = THIS_MODULE, 951 .close = raw_close, 952 .destroy = raw_destroy, 953 .connect = ip4_datagram_connect, 954 .disconnect = __udp_disconnect, 955 .ioctl = raw_ioctl, 956 .init = raw_init, 957 .setsockopt = raw_setsockopt, 958 .getsockopt = raw_getsockopt, 959 .sendmsg = raw_sendmsg, 960 .recvmsg = raw_recvmsg, 961 .bind = raw_bind, 962 .backlog_rcv = raw_rcv_skb, 963 .release_cb = ip4_datagram_release_cb, 964 .hash = raw_hash_sk, 965 .unhash = raw_unhash_sk, 966 .obj_size = sizeof(struct raw_sock), 967 .h.raw_hash = &raw_v4_hashinfo, 968 #ifdef CONFIG_COMPAT 969 .compat_setsockopt = compat_raw_setsockopt, 970 .compat_getsockopt = compat_raw_getsockopt, 971 .compat_ioctl = compat_raw_ioctl, 972 #endif 973 .diag_destroy = raw_abort, 974 }; 975 976 #ifdef CONFIG_PROC_FS 977 static struct sock *raw_get_first(struct seq_file *seq) 978 { 979 struct sock *sk; 980 struct raw_iter_state *state = raw_seq_private(seq); 981 982 for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE; 983 ++state->bucket) { 984 sk_for_each(sk, &state->h->ht[state->bucket]) 985 if (sock_net(sk) == seq_file_net(seq)) 986 goto found; 987 } 988 sk = NULL; 989 found: 990 return sk; 991 } 992 993 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk) 994 { 995 struct raw_iter_state *state = raw_seq_private(seq); 996 997 do { 998 sk = sk_next(sk); 999 try_again: 1000 ; 1001 } while (sk && sock_net(sk) != seq_file_net(seq)); 1002 1003 if (!sk && ++state->bucket < RAW_HTABLE_SIZE) { 1004 sk = sk_head(&state->h->ht[state->bucket]); 1005 goto try_again; 1006 } 1007 return sk; 1008 } 1009 1010 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos) 1011 { 1012 struct sock *sk = raw_get_first(seq); 1013 1014 if (sk) 1015 while (pos && (sk = raw_get_next(seq, sk)) != NULL) 1016 --pos; 1017 return pos ? NULL : sk; 1018 } 1019 1020 void *raw_seq_start(struct seq_file *seq, loff_t *pos) 1021 { 1022 struct raw_iter_state *state = raw_seq_private(seq); 1023 1024 read_lock(&state->h->lock); 1025 return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; 1026 } 1027 EXPORT_SYMBOL_GPL(raw_seq_start); 1028 1029 void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1030 { 1031 struct sock *sk; 1032 1033 if (v == SEQ_START_TOKEN) 1034 sk = raw_get_first(seq); 1035 else 1036 sk = raw_get_next(seq, v); 1037 ++*pos; 1038 return sk; 1039 } 1040 EXPORT_SYMBOL_GPL(raw_seq_next); 1041 1042 void raw_seq_stop(struct seq_file *seq, void *v) 1043 { 1044 struct raw_iter_state *state = raw_seq_private(seq); 1045 1046 read_unlock(&state->h->lock); 1047 } 1048 EXPORT_SYMBOL_GPL(raw_seq_stop); 1049 1050 static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i) 1051 { 1052 struct inet_sock *inet = inet_sk(sp); 1053 __be32 dest = inet->inet_daddr, 1054 src = inet->inet_rcv_saddr; 1055 __u16 destp = 0, 1056 srcp = inet->inet_num; 1057 1058 seq_printf(seq, "%4d: %08X:%04X %08X:%04X" 1059 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", 1060 i, src, srcp, dest, destp, sp->sk_state, 1061 sk_wmem_alloc_get(sp), 1062 sk_rmem_alloc_get(sp), 1063 0, 0L, 0, 1064 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), 1065 0, sock_i_ino(sp), 1066 refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops)); 1067 } 1068 1069 static int raw_seq_show(struct seq_file *seq, void *v) 1070 { 1071 if (v == SEQ_START_TOKEN) 1072 seq_printf(seq, " sl local_address rem_address st tx_queue " 1073 "rx_queue tr tm->when retrnsmt uid timeout " 1074 "inode ref pointer drops\n"); 1075 else 1076 raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket); 1077 return 0; 1078 } 1079 1080 static const struct seq_operations raw_seq_ops = { 1081 .start = raw_seq_start, 1082 .next = raw_seq_next, 1083 .stop = raw_seq_stop, 1084 .show = raw_seq_show, 1085 }; 1086 1087 int raw_seq_open(struct inode *ino, struct file *file, 1088 struct raw_hashinfo *h, const struct seq_operations *ops) 1089 { 1090 int err; 1091 struct raw_iter_state *i; 1092 1093 err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state)); 1094 if (err < 0) 1095 return err; 1096 1097 i = raw_seq_private((struct seq_file *)file->private_data); 1098 i->h = h; 1099 return 0; 1100 } 1101 EXPORT_SYMBOL_GPL(raw_seq_open); 1102 1103 static int raw_v4_seq_open(struct inode *inode, struct file *file) 1104 { 1105 return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops); 1106 } 1107 1108 static const struct file_operations raw_seq_fops = { 1109 .owner = THIS_MODULE, 1110 .open = raw_v4_seq_open, 1111 .read = seq_read, 1112 .llseek = seq_lseek, 1113 .release = seq_release_net, 1114 }; 1115 1116 static __net_init int raw_init_net(struct net *net) 1117 { 1118 if (!proc_create("raw", S_IRUGO, net->proc_net, &raw_seq_fops)) 1119 return -ENOMEM; 1120 1121 return 0; 1122 } 1123 1124 static __net_exit void raw_exit_net(struct net *net) 1125 { 1126 remove_proc_entry("raw", net->proc_net); 1127 } 1128 1129 static __net_initdata struct pernet_operations raw_net_ops = { 1130 .init = raw_init_net, 1131 .exit = raw_exit_net, 1132 }; 1133 1134 int __init raw_proc_init(void) 1135 { 1136 return register_pernet_subsys(&raw_net_ops); 1137 } 1138 1139 void __init raw_proc_exit(void) 1140 { 1141 unregister_pernet_subsys(&raw_net_ops); 1142 } 1143 #endif /* CONFIG_PROC_FS */ 1144