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v3.15
   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 <asm/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/aio.h>
  50#include <linux/kernel.h>
  51#include <linux/export.h>
  52#include <linux/spinlock.h>
  53#include <linux/sockios.h>
  54#include <linux/socket.h>
  55#include <linux/in.h>
  56#include <linux/mroute.h>
  57#include <linux/netdevice.h>
  58#include <linux/in_route.h>
  59#include <linux/route.h>
  60#include <linux/skbuff.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
  82static struct raw_hashinfo raw_v4_hashinfo = {
 
 
 
 
 
 
 
 
 
  83	.lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
  84};
 
  85
  86void raw_hash_sk(struct sock *sk)
  87{
  88	struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
  89	struct hlist_head *head;
  90
  91	head = &h->ht[inet_sk(sk)->inet_num & (RAW_HTABLE_SIZE - 1)];
  92
  93	write_lock_bh(&h->lock);
  94	sk_add_node(sk, head);
  95	sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
  96	write_unlock_bh(&h->lock);
 
 
  97}
  98EXPORT_SYMBOL_GPL(raw_hash_sk);
  99
 100void raw_unhash_sk(struct sock *sk)
 101{
 102	struct raw_hashinfo *h = sk->sk_prot->h.raw_hash;
 103
 104	write_lock_bh(&h->lock);
 105	if (sk_del_node_init(sk))
 106		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
 107	write_unlock_bh(&h->lock);
 108}
 109EXPORT_SYMBOL_GPL(raw_unhash_sk);
 110
 111static struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
 112		unsigned short num, __be32 raddr, __be32 laddr, int dif)
 
 113{
 114	sk_for_each_from(sk) {
 115		struct inet_sock *inet = inet_sk(sk);
 116
 117		if (net_eq(sock_net(sk), net) && inet->inet_num == num	&&
 118		    !(inet->inet_daddr && inet->inet_daddr != raddr) 	&&
 119		    !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
 120		    !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
 
 121			goto found; /* gotcha */
 122	}
 123	sk = NULL;
 124found:
 125	return sk;
 126}
 
 127
 128/*
 129 *	0 - deliver
 130 *	1 - block
 131 */
 132static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
 133{
 134	struct icmphdr _hdr;
 135	const struct icmphdr *hdr;
 136
 137	hdr = skb_header_pointer(skb, skb_transport_offset(skb),
 138				 sizeof(_hdr), &_hdr);
 139	if (!hdr)
 140		return 1;
 141
 142	if (hdr->type < 32) {
 143		__u32 data = raw_sk(sk)->filter.data;
 144
 145		return ((1U << hdr->type) & data) != 0;
 146	}
 147
 148	/* Do not block unknown ICMP types */
 149	return 0;
 150}
 151
 152/* IP input processing comes here for RAW socket delivery.
 153 * Caller owns SKB, so we must make clones.
 154 *
 155 * RFC 1122: SHOULD pass TOS value up to the transport layer.
 156 * -> It does. And not only TOS, but all IP header.
 157 */
 158static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
 159{
 
 160	struct sock *sk;
 161	struct hlist_head *head;
 162	int delivered = 0;
 163	struct net *net;
 164
 165	read_lock(&raw_v4_hashinfo.lock);
 166	head = &raw_v4_hashinfo.ht[hash];
 167	if (hlist_empty(head))
 168		goto out;
 169
 170	net = dev_net(skb->dev);
 171	sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
 172			     iph->saddr, iph->daddr,
 173			     skb->dev->ifindex);
 174
 175	while (sk) {
 176		delivered = 1;
 177		if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
 
 
 178			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
 179
 180			/* Not releasing hash table! */
 181			if (clone)
 182				raw_rcv(sk, clone);
 183		}
 184		sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
 185				     iph->saddr, iph->daddr,
 186				     skb->dev->ifindex);
 187	}
 188out:
 189	read_unlock(&raw_v4_hashinfo.lock);
 190	return delivered;
 191}
 192
 193int raw_local_deliver(struct sk_buff *skb, int protocol)
 194{
 195	int hash;
 196	struct sock *raw_sk;
 197
 198	hash = protocol & (RAW_HTABLE_SIZE - 1);
 199	raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 200
 201	/* If there maybe a raw socket we must check - if not we
 202	 * don't care less
 203	 */
 204	if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
 205		raw_sk = NULL;
 206
 207	return raw_sk != NULL;
 208
 209}
 210
 211static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
 212{
 213	struct inet_sock *inet = inet_sk(sk);
 214	const int type = icmp_hdr(skb)->type;
 215	const int code = icmp_hdr(skb)->code;
 216	int err = 0;
 217	int harderr = 0;
 218
 219	if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
 220		ipv4_sk_update_pmtu(skb, sk, info);
 221	else if (type == ICMP_REDIRECT) {
 222		ipv4_sk_redirect(skb, sk);
 223		return;
 224	}
 225
 226	/* Report error on raw socket, if:
 227	   1. User requested ip_recverr.
 228	   2. Socket is connected (otherwise the error indication
 229	      is useless without ip_recverr and error is hard.
 230	 */
 231	if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
 232		return;
 233
 234	switch (type) {
 235	default:
 236	case ICMP_TIME_EXCEEDED:
 237		err = EHOSTUNREACH;
 238		break;
 239	case ICMP_SOURCE_QUENCH:
 240		return;
 241	case ICMP_PARAMETERPROB:
 242		err = EPROTO;
 243		harderr = 1;
 244		break;
 245	case ICMP_DEST_UNREACH:
 246		err = EHOSTUNREACH;
 247		if (code > NR_ICMP_UNREACH)
 248			break;
 249		err = icmp_err_convert[code].errno;
 250		harderr = icmp_err_convert[code].fatal;
 251		if (code == ICMP_FRAG_NEEDED) {
 252			harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
 253			err = EMSGSIZE;
 254		}
 255	}
 256
 257	if (inet->recverr) {
 258		const struct iphdr *iph = (const struct iphdr *)skb->data;
 259		u8 *payload = skb->data + (iph->ihl << 2);
 260
 261		if (inet->hdrincl)
 262			payload = skb->data;
 263		ip_icmp_error(sk, skb, err, 0, info, payload);
 264	}
 265
 266	if (inet->recverr || harderr) {
 267		sk->sk_err = err;
 268		sk->sk_error_report(sk);
 269	}
 270}
 271
 272void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
 273{
 274	int hash;
 275	struct sock *raw_sk;
 276	const struct iphdr *iph;
 277	struct net *net;
 278
 279	hash = protocol & (RAW_HTABLE_SIZE - 1);
 280
 281	read_lock(&raw_v4_hashinfo.lock);
 282	raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 283	if (raw_sk != NULL) {
 
 
 
 284		iph = (const struct iphdr *)skb->data;
 285		net = dev_net(skb->dev);
 286
 287		while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
 288						iph->daddr, iph->saddr,
 289						skb->dev->ifindex)) != NULL) {
 290			raw_err(raw_sk, skb, info);
 291			raw_sk = sk_next(raw_sk);
 292			iph = (const struct iphdr *)skb->data;
 293		}
 294	}
 295	read_unlock(&raw_v4_hashinfo.lock);
 296}
 297
 298static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 299{
 300	/* Charge it to the socket. */
 301
 302	ipv4_pktinfo_prepare(sk, skb);
 303	if (sock_queue_rcv_skb(sk, skb) < 0) {
 304		kfree_skb(skb);
 305		return NET_RX_DROP;
 306	}
 307
 308	return NET_RX_SUCCESS;
 309}
 310
 311int raw_rcv(struct sock *sk, struct sk_buff *skb)
 312{
 313	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
 314		atomic_inc(&sk->sk_drops);
 315		kfree_skb(skb);
 316		return NET_RX_DROP;
 317	}
 318	nf_reset(skb);
 319
 320	skb_push(skb, skb->data - skb_network_header(skb));
 321
 322	raw_rcv_skb(sk, skb);
 323	return 0;
 324}
 325
 326static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
 327			   void *from, size_t length,
 328			   struct rtable **rtp,
 329			   unsigned int flags)
 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 (flags&MSG_PROBE)
 346		goto out;
 347
 348	hlen = LL_RESERVED_SPACE(rt->dst.dev);
 349	tlen = rt->dst.dev->needed_tailroom;
 350	skb = sock_alloc_send_skb(sk,
 351				  length + hlen + tlen + 15,
 352				  flags & MSG_DONTWAIT, &err);
 353	if (skb == NULL)
 354		goto error;
 355	skb_reserve(skb, hlen);
 356
 357	skb->priority = sk->sk_priority;
 358	skb->mark = sk->sk_mark;
 359	skb_dst_set(skb, &rt->dst);
 360	*rtp = NULL;
 361
 362	skb_reset_network_header(skb);
 363	iph = ip_hdr(skb);
 364	skb_put(skb, length);
 365
 366	skb->ip_summed = CHECKSUM_NONE;
 367
 
 
 
 
 
 368	skb->transport_header = skb->network_header;
 369	err = -EFAULT;
 370	if (memcpy_fromiovecend((void *)iph, from, 0, length))
 371		goto error_free;
 372
 373	iphlen = iph->ihl * 4;
 374
 375	/*
 376	 * We don't want to modify the ip header, but we do need to
 377	 * be sure that it won't cause problems later along the network
 378	 * stack.  Specifically we want to make sure that iph->ihl is a
 379	 * sane value.  If ihl points beyond the length of the buffer passed
 380	 * in, reject the frame as invalid
 381	 */
 382	err = -EINVAL;
 383	if (iphlen > length)
 384		goto error_free;
 385
 386	if (iphlen >= sizeof(*iph)) {
 387		if (!iph->saddr)
 388			iph->saddr = fl4->saddr;
 389		iph->check   = 0;
 390		iph->tot_len = htons(length);
 391		if (!iph->id)
 392			ip_select_ident(skb, &rt->dst, NULL);
 393
 394		iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 
 
 
 
 
 395	}
 396	if (iph->protocol == IPPROTO_ICMP)
 397		icmp_out_count(net, ((struct icmphdr *)
 398			skb_transport_header(skb))->type);
 399
 400	err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT, skb, NULL,
 401		      rt->dst.dev, dst_output);
 
 402	if (err > 0)
 403		err = net_xmit_errno(err);
 404	if (err)
 405		goto error;
 406out:
 407	return 0;
 408
 409error_free:
 410	kfree_skb(skb);
 411error:
 412	IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
 413	if (err == -ENOBUFS && !inet->recverr)
 414		err = 0;
 415	return err;
 416}
 417
 418static int raw_probe_proto_opt(struct flowi4 *fl4, struct msghdr *msg)
 419{
 420	struct iovec *iov;
 421	u8 __user *type = NULL;
 422	u8 __user *code = NULL;
 423	int probed = 0;
 424	unsigned int i;
 425
 426	if (!msg->msg_iov)
 427		return 0;
 428
 429	for (i = 0; i < msg->msg_iovlen; i++) {
 430		iov = &msg->msg_iov[i];
 431		if (!iov)
 432			continue;
 433
 434		switch (fl4->flowi4_proto) {
 435		case IPPROTO_ICMP:
 436			/* check if one-byte field is readable or not. */
 437			if (iov->iov_base && iov->iov_len < 1)
 438				break;
 439
 440			if (!type) {
 441				type = iov->iov_base;
 442				/* check if code field is readable or not. */
 443				if (iov->iov_len > 1)
 444					code = type + 1;
 445			} else if (!code)
 446				code = iov->iov_base;
 447
 448			if (type && code) {
 449				if (get_user(fl4->fl4_icmp_type, type) ||
 450				    get_user(fl4->fl4_icmp_code, code))
 451					return -EFAULT;
 452				probed = 1;
 453			}
 454			break;
 455		default:
 456			probed = 1;
 457			break;
 458		}
 459		if (probed)
 460			break;
 461	}
 462	return 0;
 463}
 464
 465static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 466		       size_t len)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 467{
 468	struct inet_sock *inet = inet_sk(sk);
 
 469	struct ipcm_cookie ipc;
 470	struct rtable *rt = NULL;
 471	struct flowi4 fl4;
 472	int free = 0;
 473	__be32 daddr;
 474	__be32 saddr;
 475	u8  tos;
 476	int err;
 477	struct ip_options_data opt_copy;
 
 
 478
 479	err = -EMSGSIZE;
 480	if (len > 0xFFFF)
 481		goto out;
 482
 
 
 
 
 
 
 483	/*
 484	 *	Check the flags.
 485	 */
 486
 487	err = -EOPNOTSUPP;
 488	if (msg->msg_flags & MSG_OOB)	/* Mirror BSD error message */
 489		goto out;               /* compatibility */
 490
 491	/*
 492	 *	Get and verify the address.
 493	 */
 494
 495	if (msg->msg_namelen) {
 496		DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
 497		err = -EINVAL;
 498		if (msg->msg_namelen < sizeof(*usin))
 499			goto out;
 500		if (usin->sin_family != AF_INET) {
 501			pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
 502				     __func__, current->comm);
 503			err = -EAFNOSUPPORT;
 504			if (usin->sin_family)
 505				goto out;
 506		}
 507		daddr = usin->sin_addr.s_addr;
 508		/* ANK: I did not forget to get protocol from port field.
 509		 * I just do not know, who uses this weirdness.
 510		 * IP_HDRINCL is much more convenient.
 511		 */
 512	} else {
 513		err = -EDESTADDRREQ;
 514		if (sk->sk_state != TCP_ESTABLISHED)
 515			goto out;
 516		daddr = inet->inet_daddr;
 517	}
 518
 
 519	ipc.addr = inet->inet_saddr;
 520	ipc.opt = NULL;
 521	ipc.tx_flags = 0;
 522	ipc.ttl = 0;
 523	ipc.tos = -1;
 524	ipc.oif = sk->sk_bound_dev_if;
 525
 526	if (msg->msg_controllen) {
 527		err = ip_cmsg_send(sock_net(sk), msg, &ipc, false);
 528		if (err)
 
 529			goto out;
 
 530		if (ipc.opt)
 531			free = 1;
 532	}
 533
 534	saddr = ipc.addr;
 535	ipc.addr = daddr;
 536
 537	if (!ipc.opt) {
 538		struct ip_options_rcu *inet_opt;
 539
 540		rcu_read_lock();
 541		inet_opt = rcu_dereference(inet->inet_opt);
 542		if (inet_opt) {
 543			memcpy(&opt_copy, inet_opt,
 544			       sizeof(*inet_opt) + inet_opt->opt.optlen);
 545			ipc.opt = &opt_copy.opt;
 546		}
 547		rcu_read_unlock();
 548	}
 549
 550	if (ipc.opt) {
 551		err = -EINVAL;
 552		/* Linux does not mangle headers on raw sockets,
 553		 * so that IP options + IP_HDRINCL is non-sense.
 554		 */
 555		if (inet->hdrincl)
 556			goto done;
 557		if (ipc.opt->opt.srr) {
 558			if (!daddr)
 559				goto done;
 560			daddr = ipc.opt->opt.faddr;
 561		}
 562	}
 563	tos = get_rtconn_flags(&ipc, sk);
 564	if (msg->msg_flags & MSG_DONTROUTE)
 565		tos |= RTO_ONLINK;
 566
 567	if (ipv4_is_multicast(daddr)) {
 568		if (!ipc.oif)
 569			ipc.oif = inet->mc_index;
 570		if (!saddr)
 571			saddr = inet->mc_addr;
 572	} else if (!ipc.oif)
 573		ipc.oif = inet->uc_index;
 
 
 
 
 
 
 
 
 
 
 
 
 
 574
 575	flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
 576			   RT_SCOPE_UNIVERSE,
 577			   inet->hdrincl ? IPPROTO_RAW : sk->sk_protocol,
 578			   inet_sk_flowi_flags(sk) |
 579			    (inet->hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
 580			   daddr, saddr, 0, 0);
 
 
 
 
 581
 582	if (!inet->hdrincl) {
 583		err = raw_probe_proto_opt(&fl4, msg);
 584		if (err)
 585			goto done;
 586	}
 587
 588	security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
 589	rt = ip_route_output_flow(sock_net(sk), &fl4, sk);
 590	if (IS_ERR(rt)) {
 591		err = PTR_ERR(rt);
 592		rt = NULL;
 593		goto done;
 594	}
 595
 596	err = -EACCES;
 597	if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
 598		goto done;
 599
 600	if (msg->msg_flags & MSG_CONFIRM)
 601		goto do_confirm;
 602back_from_confirm:
 603
 604	if (inet->hdrincl)
 605		err = raw_send_hdrinc(sk, &fl4, msg->msg_iov, len,
 606				      &rt, msg->msg_flags);
 607
 608	 else {
 
 
 609		if (!ipc.addr)
 610			ipc.addr = fl4.daddr;
 611		lock_sock(sk);
 612		err = ip_append_data(sk, &fl4, ip_generic_getfrag,
 613				     msg->msg_iov, len, 0,
 614				     &ipc, &rt, msg->msg_flags);
 615		if (err)
 616			ip_flush_pending_frames(sk);
 617		else if (!(msg->msg_flags & MSG_MORE)) {
 618			err = ip_push_pending_frames(sk, &fl4);
 619			if (err == -ENOBUFS && !inet->recverr)
 620				err = 0;
 621		}
 622		release_sock(sk);
 623	}
 624done:
 625	if (free)
 626		kfree(ipc.opt);
 627	ip_rt_put(rt);
 628
 629out:
 630	if (err < 0)
 631		return err;
 632	return len;
 633
 634do_confirm:
 635	dst_confirm(&rt->dst);
 
 636	if (!(msg->msg_flags & MSG_PROBE) || len)
 637		goto back_from_confirm;
 638	err = 0;
 639	goto done;
 640}
 641
 642static void raw_close(struct sock *sk, long timeout)
 643{
 644	/*
 645	 * Raw sockets may have direct kernel references. Kill them.
 646	 */
 647	ip_ra_control(sk, 0, NULL);
 648
 649	sk_common_release(sk);
 650}
 651
 652static void raw_destroy(struct sock *sk)
 653{
 654	lock_sock(sk);
 655	ip_flush_pending_frames(sk);
 656	release_sock(sk);
 657}
 658
 659/* This gets rid of all the nasties in af_inet. -DaveM */
 660static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 661{
 662	struct inet_sock *inet = inet_sk(sk);
 663	struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
 
 664	int ret = -EINVAL;
 665	int chk_addr_ret;
 666
 667	if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
 668		goto out;
 669	chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
 
 
 
 
 
 
 
 670	ret = -EADDRNOTAVAIL;
 671	if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
 672	    chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
 673		goto out;
 674	inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
 675	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
 676		inet->inet_saddr = 0;  /* Use device */
 677	sk_dst_reset(sk);
 678	ret = 0;
 679out:	return ret;
 680}
 681
 682/*
 683 *	This should be easy, if there is something there
 684 *	we return it, otherwise we block.
 685 */
 686
 687static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 688		       size_t len, int noblock, int flags, int *addr_len)
 689{
 690	struct inet_sock *inet = inet_sk(sk);
 691	size_t copied = 0;
 692	int err = -EOPNOTSUPP;
 693	DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
 694	struct sk_buff *skb;
 695
 696	if (flags & MSG_OOB)
 697		goto out;
 698
 699	if (flags & MSG_ERRQUEUE) {
 700		err = ip_recv_error(sk, msg, len, addr_len);
 701		goto out;
 702	}
 703
 704	skb = skb_recv_datagram(sk, flags, noblock, &err);
 705	if (!skb)
 706		goto out;
 707
 708	copied = skb->len;
 709	if (len < copied) {
 710		msg->msg_flags |= MSG_TRUNC;
 711		copied = len;
 712	}
 713
 714	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
 715	if (err)
 716		goto done;
 717
 718	sock_recv_ts_and_drops(msg, sk, skb);
 719
 720	/* Copy the address. */
 721	if (sin) {
 722		sin->sin_family = AF_INET;
 723		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 724		sin->sin_port = 0;
 725		memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 726		*addr_len = sizeof(*sin);
 727	}
 728	if (inet->cmsg_flags)
 729		ip_cmsg_recv(msg, skb);
 730	if (flags & MSG_TRUNC)
 731		copied = skb->len;
 732done:
 733	skb_free_datagram(sk, skb);
 734out:
 735	if (err)
 736		return err;
 737	return copied;
 738}
 739
 740static int raw_init(struct sock *sk)
 741{
 742	struct raw_sock *rp = raw_sk(sk);
 743
 744	if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
 745		memset(&rp->filter, 0, sizeof(rp->filter));
 746	return 0;
 747}
 748
 749static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
 750{
 751	if (optlen > sizeof(struct icmp_filter))
 752		optlen = sizeof(struct icmp_filter);
 753	if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
 754		return -EFAULT;
 755	return 0;
 756}
 757
 758static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
 759{
 760	int len, ret = -EFAULT;
 761
 762	if (get_user(len, optlen))
 763		goto out;
 764	ret = -EINVAL;
 765	if (len < 0)
 766		goto out;
 767	if (len > sizeof(struct icmp_filter))
 768		len = sizeof(struct icmp_filter);
 769	ret = -EFAULT;
 770	if (put_user(len, optlen) ||
 771	    copy_to_user(optval, &raw_sk(sk)->filter, len))
 772		goto out;
 773	ret = 0;
 774out:	return ret;
 775}
 776
 777static int do_raw_setsockopt(struct sock *sk, int level, int optname,
 778			  char __user *optval, unsigned int optlen)
 779{
 780	if (optname == ICMP_FILTER) {
 781		if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 782			return -EOPNOTSUPP;
 783		else
 784			return raw_seticmpfilter(sk, optval, optlen);
 785	}
 786	return -ENOPROTOOPT;
 787}
 788
 789static int raw_setsockopt(struct sock *sk, int level, int optname,
 790			  char __user *optval, unsigned int optlen)
 791{
 792	if (level != SOL_RAW)
 793		return ip_setsockopt(sk, level, optname, optval, optlen);
 794	return do_raw_setsockopt(sk, level, optname, optval, optlen);
 795}
 796
 797#ifdef CONFIG_COMPAT
 798static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
 799				 char __user *optval, unsigned int optlen)
 800{
 801	if (level != SOL_RAW)
 802		return compat_ip_setsockopt(sk, level, optname, optval, optlen);
 803	return do_raw_setsockopt(sk, level, optname, optval, optlen);
 804}
 805#endif
 806
 807static int do_raw_getsockopt(struct sock *sk, int level, int optname,
 808			  char __user *optval, int __user *optlen)
 809{
 810	if (optname == ICMP_FILTER) {
 811		if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 812			return -EOPNOTSUPP;
 813		else
 814			return raw_geticmpfilter(sk, optval, optlen);
 815	}
 816	return -ENOPROTOOPT;
 817}
 818
 819static int raw_getsockopt(struct sock *sk, int level, int optname,
 820			  char __user *optval, int __user *optlen)
 821{
 822	if (level != SOL_RAW)
 823		return ip_getsockopt(sk, level, optname, optval, optlen);
 824	return do_raw_getsockopt(sk, level, optname, optval, optlen);
 825}
 826
 827#ifdef CONFIG_COMPAT
 828static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
 829				 char __user *optval, int __user *optlen)
 830{
 831	if (level != SOL_RAW)
 832		return compat_ip_getsockopt(sk, level, optname, optval, optlen);
 833	return do_raw_getsockopt(sk, level, optname, optval, optlen);
 834}
 835#endif
 836
 837static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
 838{
 839	switch (cmd) {
 840	case SIOCOUTQ: {
 841		int amount = sk_wmem_alloc_get(sk);
 842
 843		return put_user(amount, (int __user *)arg);
 844	}
 845	case SIOCINQ: {
 846		struct sk_buff *skb;
 847		int amount = 0;
 848
 849		spin_lock_bh(&sk->sk_receive_queue.lock);
 850		skb = skb_peek(&sk->sk_receive_queue);
 851		if (skb != NULL)
 852			amount = skb->len;
 853		spin_unlock_bh(&sk->sk_receive_queue.lock);
 854		return put_user(amount, (int __user *)arg);
 855	}
 856
 857	default:
 858#ifdef CONFIG_IP_MROUTE
 859		return ipmr_ioctl(sk, cmd, (void __user *)arg);
 860#else
 861		return -ENOIOCTLCMD;
 862#endif
 863	}
 864}
 865
 866#ifdef CONFIG_COMPAT
 867static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
 868{
 869	switch (cmd) {
 870	case SIOCOUTQ:
 871	case SIOCINQ:
 872		return -ENOIOCTLCMD;
 873	default:
 874#ifdef CONFIG_IP_MROUTE
 875		return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
 876#else
 877		return -ENOIOCTLCMD;
 878#endif
 879	}
 880}
 881#endif
 882
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 883struct proto raw_prot = {
 884	.name		   = "RAW",
 885	.owner		   = THIS_MODULE,
 886	.close		   = raw_close,
 887	.destroy	   = raw_destroy,
 888	.connect	   = ip4_datagram_connect,
 889	.disconnect	   = udp_disconnect,
 890	.ioctl		   = raw_ioctl,
 891	.init		   = raw_init,
 892	.setsockopt	   = raw_setsockopt,
 893	.getsockopt	   = raw_getsockopt,
 894	.sendmsg	   = raw_sendmsg,
 895	.recvmsg	   = raw_recvmsg,
 896	.bind		   = raw_bind,
 897	.backlog_rcv	   = raw_rcv_skb,
 898	.release_cb	   = ip4_datagram_release_cb,
 899	.hash		   = raw_hash_sk,
 900	.unhash		   = raw_unhash_sk,
 901	.obj_size	   = sizeof(struct raw_sock),
 
 
 902	.h.raw_hash	   = &raw_v4_hashinfo,
 903#ifdef CONFIG_COMPAT
 904	.compat_setsockopt = compat_raw_setsockopt,
 905	.compat_getsockopt = compat_raw_getsockopt,
 906	.compat_ioctl	   = compat_raw_ioctl,
 907#endif
 
 908};
 909
 910#ifdef CONFIG_PROC_FS
 911static struct sock *raw_get_first(struct seq_file *seq)
 912{
 913	struct sock *sk;
 914	struct raw_iter_state *state = raw_seq_private(seq);
 915
 916	for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
 917			++state->bucket) {
 918		sk_for_each(sk, &state->h->ht[state->bucket])
 919			if (sock_net(sk) == seq_file_net(seq))
 920				goto found;
 921	}
 922	sk = NULL;
 923found:
 924	return sk;
 925}
 926
 927static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
 928{
 929	struct raw_iter_state *state = raw_seq_private(seq);
 930
 931	do {
 932		sk = sk_next(sk);
 933try_again:
 934		;
 935	} while (sk && sock_net(sk) != seq_file_net(seq));
 936
 937	if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
 938		sk = sk_head(&state->h->ht[state->bucket]);
 939		goto try_again;
 940	}
 941	return sk;
 942}
 943
 944static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
 945{
 946	struct sock *sk = raw_get_first(seq);
 947
 948	if (sk)
 949		while (pos && (sk = raw_get_next(seq, sk)) != NULL)
 950			--pos;
 951	return pos ? NULL : sk;
 952}
 953
 954void *raw_seq_start(struct seq_file *seq, loff_t *pos)
 955{
 956	struct raw_iter_state *state = raw_seq_private(seq);
 957
 958	read_lock(&state->h->lock);
 959	return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
 960}
 961EXPORT_SYMBOL_GPL(raw_seq_start);
 962
 963void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 964{
 965	struct sock *sk;
 966
 967	if (v == SEQ_START_TOKEN)
 968		sk = raw_get_first(seq);
 969	else
 970		sk = raw_get_next(seq, v);
 971	++*pos;
 972	return sk;
 973}
 974EXPORT_SYMBOL_GPL(raw_seq_next);
 975
 976void raw_seq_stop(struct seq_file *seq, void *v)
 977{
 978	struct raw_iter_state *state = raw_seq_private(seq);
 979
 980	read_unlock(&state->h->lock);
 981}
 982EXPORT_SYMBOL_GPL(raw_seq_stop);
 983
 984static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
 985{
 986	struct inet_sock *inet = inet_sk(sp);
 987	__be32 dest = inet->inet_daddr,
 988	       src = inet->inet_rcv_saddr;
 989	__u16 destp = 0,
 990	      srcp  = inet->inet_num;
 991
 992	seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
 993		" %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
 994		i, src, srcp, dest, destp, sp->sk_state,
 995		sk_wmem_alloc_get(sp),
 996		sk_rmem_alloc_get(sp),
 997		0, 0L, 0,
 998		from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
 999		0, sock_i_ino(sp),
1000		atomic_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1001}
1002
1003static int raw_seq_show(struct seq_file *seq, void *v)
1004{
1005	if (v == SEQ_START_TOKEN)
1006		seq_printf(seq, "  sl  local_address rem_address   st tx_queue "
1007				"rx_queue tr tm->when retrnsmt   uid  timeout "
1008				"inode ref pointer drops\n");
1009	else
1010		raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1011	return 0;
1012}
1013
1014static const struct seq_operations raw_seq_ops = {
1015	.start = raw_seq_start,
1016	.next  = raw_seq_next,
1017	.stop  = raw_seq_stop,
1018	.show  = raw_seq_show,
1019};
1020
1021int raw_seq_open(struct inode *ino, struct file *file,
1022		 struct raw_hashinfo *h, const struct seq_operations *ops)
1023{
1024	int err;
1025	struct raw_iter_state *i;
1026
1027	err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1028	if (err < 0)
1029		return err;
1030
1031	i = raw_seq_private((struct seq_file *)file->private_data);
1032	i->h = h;
1033	return 0;
1034}
1035EXPORT_SYMBOL_GPL(raw_seq_open);
1036
1037static int raw_v4_seq_open(struct inode *inode, struct file *file)
1038{
1039	return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1040}
1041
1042static const struct file_operations raw_seq_fops = {
1043	.owner	 = THIS_MODULE,
1044	.open	 = raw_v4_seq_open,
1045	.read	 = seq_read,
1046	.llseek	 = seq_lseek,
1047	.release = seq_release_net,
1048};
1049
1050static __net_init int raw_init_net(struct net *net)
1051{
1052	if (!proc_create("raw", S_IRUGO, net->proc_net, &raw_seq_fops))
1053		return -ENOMEM;
1054
1055	return 0;
1056}
1057
1058static __net_exit void raw_exit_net(struct net *net)
1059{
1060	remove_proc_entry("raw", net->proc_net);
1061}
1062
1063static __net_initdata struct pernet_operations raw_net_ops = {
1064	.init = raw_init_net,
1065	.exit = raw_exit_net,
1066};
1067
1068int __init raw_proc_init(void)
1069{
1070	return register_pernet_subsys(&raw_net_ops);
1071}
1072
1073void __init raw_proc_exit(void)
1074{
1075	unregister_pernet_subsys(&raw_net_ops);
1076}
1077#endif /* CONFIG_PROC_FS */
v4.17
   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
  83struct raw_frag_vec {
  84	struct msghdr *msg;
  85	union {
  86		struct icmphdr icmph;
  87		char c[1];
  88	} hdr;
  89	int hlen;
  90};
  91
  92struct raw_hashinfo raw_v4_hashinfo = {
  93	.lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock),
  94};
  95EXPORT_SYMBOL_GPL(raw_v4_hashinfo);
  96
  97int 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}
 111EXPORT_SYMBOL_GPL(raw_hash_sk);
 112
 113void 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}
 122EXPORT_SYMBOL_GPL(raw_unhash_sk);
 123
 124struct sock *__raw_v4_lookup(struct net *net, struct sock *sk,
 125			     unsigned short num, __be32 raddr, __be32 laddr,
 126			     int dif, int sdif)
 127{
 128	sk_for_each_from(sk) {
 129		struct inet_sock *inet = inet_sk(sk);
 130
 131		if (net_eq(sock_net(sk), net) && inet->inet_num == num	&&
 132		    !(inet->inet_daddr && inet->inet_daddr != raddr) 	&&
 133		    !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
 134		    !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif &&
 135		      sk->sk_bound_dev_if != sdif))
 136			goto found; /* gotcha */
 137	}
 138	sk = NULL;
 139found:
 140	return sk;
 141}
 142EXPORT_SYMBOL_GPL(__raw_v4_lookup);
 143
 144/*
 145 *	0 - deliver
 146 *	1 - block
 147 */
 148static int icmp_filter(const struct sock *sk, const struct sk_buff *skb)
 149{
 150	struct icmphdr _hdr;
 151	const struct icmphdr *hdr;
 152
 153	hdr = skb_header_pointer(skb, skb_transport_offset(skb),
 154				 sizeof(_hdr), &_hdr);
 155	if (!hdr)
 156		return 1;
 157
 158	if (hdr->type < 32) {
 159		__u32 data = raw_sk(sk)->filter.data;
 160
 161		return ((1U << hdr->type) & data) != 0;
 162	}
 163
 164	/* Do not block unknown ICMP types */
 165	return 0;
 166}
 167
 168/* IP input processing comes here for RAW socket delivery.
 169 * Caller owns SKB, so we must make clones.
 170 *
 171 * RFC 1122: SHOULD pass TOS value up to the transport layer.
 172 * -> It does. And not only TOS, but all IP header.
 173 */
 174static int raw_v4_input(struct sk_buff *skb, const struct iphdr *iph, int hash)
 175{
 176	int sdif = inet_sdif(skb);
 177	struct sock *sk;
 178	struct hlist_head *head;
 179	int delivered = 0;
 180	struct net *net;
 181
 182	read_lock(&raw_v4_hashinfo.lock);
 183	head = &raw_v4_hashinfo.ht[hash];
 184	if (hlist_empty(head))
 185		goto out;
 186
 187	net = dev_net(skb->dev);
 188	sk = __raw_v4_lookup(net, __sk_head(head), iph->protocol,
 189			     iph->saddr, iph->daddr,
 190			     skb->dev->ifindex, sdif);
 191
 192	while (sk) {
 193		delivered = 1;
 194		if ((iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) &&
 195		    ip_mc_sf_allow(sk, iph->daddr, iph->saddr,
 196				   skb->dev->ifindex, sdif)) {
 197			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
 198
 199			/* Not releasing hash table! */
 200			if (clone)
 201				raw_rcv(sk, clone);
 202		}
 203		sk = __raw_v4_lookup(net, sk_next(sk), iph->protocol,
 204				     iph->saddr, iph->daddr,
 205				     skb->dev->ifindex, sdif);
 206	}
 207out:
 208	read_unlock(&raw_v4_hashinfo.lock);
 209	return delivered;
 210}
 211
 212int raw_local_deliver(struct sk_buff *skb, int protocol)
 213{
 214	int hash;
 215	struct sock *raw_sk;
 216
 217	hash = protocol & (RAW_HTABLE_SIZE - 1);
 218	raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 219
 220	/* If there maybe a raw socket we must check - if not we
 221	 * don't care less
 222	 */
 223	if (raw_sk && !raw_v4_input(skb, ip_hdr(skb), hash))
 224		raw_sk = NULL;
 225
 226	return raw_sk != NULL;
 227
 228}
 229
 230static void raw_err(struct sock *sk, struct sk_buff *skb, u32 info)
 231{
 232	struct inet_sock *inet = inet_sk(sk);
 233	const int type = icmp_hdr(skb)->type;
 234	const int code = icmp_hdr(skb)->code;
 235	int err = 0;
 236	int harderr = 0;
 237
 238	if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED)
 239		ipv4_sk_update_pmtu(skb, sk, info);
 240	else if (type == ICMP_REDIRECT) {
 241		ipv4_sk_redirect(skb, sk);
 242		return;
 243	}
 244
 245	/* Report error on raw socket, if:
 246	   1. User requested ip_recverr.
 247	   2. Socket is connected (otherwise the error indication
 248	      is useless without ip_recverr and error is hard.
 249	 */
 250	if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
 251		return;
 252
 253	switch (type) {
 254	default:
 255	case ICMP_TIME_EXCEEDED:
 256		err = EHOSTUNREACH;
 257		break;
 258	case ICMP_SOURCE_QUENCH:
 259		return;
 260	case ICMP_PARAMETERPROB:
 261		err = EPROTO;
 262		harderr = 1;
 263		break;
 264	case ICMP_DEST_UNREACH:
 265		err = EHOSTUNREACH;
 266		if (code > NR_ICMP_UNREACH)
 267			break;
 268		err = icmp_err_convert[code].errno;
 269		harderr = icmp_err_convert[code].fatal;
 270		if (code == ICMP_FRAG_NEEDED) {
 271			harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
 272			err = EMSGSIZE;
 273		}
 274	}
 275
 276	if (inet->recverr) {
 277		const struct iphdr *iph = (const struct iphdr *)skb->data;
 278		u8 *payload = skb->data + (iph->ihl << 2);
 279
 280		if (inet->hdrincl)
 281			payload = skb->data;
 282		ip_icmp_error(sk, skb, err, 0, info, payload);
 283	}
 284
 285	if (inet->recverr || harderr) {
 286		sk->sk_err = err;
 287		sk->sk_error_report(sk);
 288	}
 289}
 290
 291void raw_icmp_error(struct sk_buff *skb, int protocol, u32 info)
 292{
 293	int hash;
 294	struct sock *raw_sk;
 295	const struct iphdr *iph;
 296	struct net *net;
 297
 298	hash = protocol & (RAW_HTABLE_SIZE - 1);
 299
 300	read_lock(&raw_v4_hashinfo.lock);
 301	raw_sk = sk_head(&raw_v4_hashinfo.ht[hash]);
 302	if (raw_sk) {
 303		int dif = skb->dev->ifindex;
 304		int sdif = inet_sdif(skb);
 305
 306		iph = (const struct iphdr *)skb->data;
 307		net = dev_net(skb->dev);
 308
 309		while ((raw_sk = __raw_v4_lookup(net, raw_sk, protocol,
 310						iph->daddr, iph->saddr,
 311						dif, sdif)) != NULL) {
 312			raw_err(raw_sk, skb, info);
 313			raw_sk = sk_next(raw_sk);
 314			iph = (const struct iphdr *)skb->data;
 315		}
 316	}
 317	read_unlock(&raw_v4_hashinfo.lock);
 318}
 319
 320static int raw_rcv_skb(struct sock *sk, struct sk_buff *skb)
 321{
 322	/* Charge it to the socket. */
 323
 324	ipv4_pktinfo_prepare(sk, skb);
 325	if (sock_queue_rcv_skb(sk, skb) < 0) {
 326		kfree_skb(skb);
 327		return NET_RX_DROP;
 328	}
 329
 330	return NET_RX_SUCCESS;
 331}
 332
 333int raw_rcv(struct sock *sk, struct sk_buff *skb)
 334{
 335	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
 336		atomic_inc(&sk->sk_drops);
 337		kfree_skb(skb);
 338		return NET_RX_DROP;
 339	}
 340	nf_reset(skb);
 341
 342	skb_push(skb, skb->data - skb_network_header(skb));
 343
 344	raw_rcv_skb(sk, skb);
 345	return 0;
 346}
 347
 348static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
 349			   struct msghdr *msg, size_t length,
 350			   struct rtable **rtp, unsigned int flags,
 351			   const struct sockcm_cookie *sockc)
 352{
 353	struct inet_sock *inet = inet_sk(sk);
 354	struct net *net = sock_net(sk);
 355	struct iphdr *iph;
 356	struct sk_buff *skb;
 357	unsigned int iphlen;
 358	int err;
 359	struct rtable *rt = *rtp;
 360	int hlen, tlen;
 361
 362	if (length > rt->dst.dev->mtu) {
 363		ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
 364			       rt->dst.dev->mtu);
 365		return -EMSGSIZE;
 366	}
 367	if (length < sizeof(struct iphdr))
 368		return -EINVAL;
 369
 370	if (flags&MSG_PROBE)
 371		goto out;
 372
 373	hlen = LL_RESERVED_SPACE(rt->dst.dev);
 374	tlen = rt->dst.dev->needed_tailroom;
 375	skb = sock_alloc_send_skb(sk,
 376				  length + hlen + tlen + 15,
 377				  flags & MSG_DONTWAIT, &err);
 378	if (!skb)
 379		goto error;
 380	skb_reserve(skb, hlen);
 381
 382	skb->priority = sk->sk_priority;
 383	skb->mark = sk->sk_mark;
 384	skb_dst_set(skb, &rt->dst);
 385	*rtp = NULL;
 386
 387	skb_reset_network_header(skb);
 388	iph = ip_hdr(skb);
 389	skb_put(skb, length);
 390
 391	skb->ip_summed = CHECKSUM_NONE;
 392
 393	sock_tx_timestamp(sk, sockc->tsflags, &skb_shinfo(skb)->tx_flags);
 394
 395	if (flags & MSG_CONFIRM)
 396		skb_set_dst_pending_confirm(skb, 1);
 397
 398	skb->transport_header = skb->network_header;
 399	err = -EFAULT;
 400	if (memcpy_from_msg(iph, msg, length))
 401		goto error_free;
 402
 403	iphlen = iph->ihl * 4;
 404
 405	/*
 406	 * We don't want to modify the ip header, but we do need to
 407	 * be sure that it won't cause problems later along the network
 408	 * stack.  Specifically we want to make sure that iph->ihl is a
 409	 * sane value.  If ihl points beyond the length of the buffer passed
 410	 * in, reject the frame as invalid
 411	 */
 412	err = -EINVAL;
 413	if (iphlen > length)
 414		goto error_free;
 415
 416	if (iphlen >= sizeof(*iph)) {
 417		if (!iph->saddr)
 418			iph->saddr = fl4->saddr;
 419		iph->check   = 0;
 420		iph->tot_len = htons(length);
 421		if (!iph->id)
 422			ip_select_ident(net, skb, NULL);
 423
 424		iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
 425		skb->transport_header += iphlen;
 426		if (iph->protocol == IPPROTO_ICMP &&
 427		    length >= iphlen + sizeof(struct icmphdr))
 428			icmp_out_count(net, ((struct icmphdr *)
 429				skb_transport_header(skb))->type);
 430	}
 
 
 
 431
 432	err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
 433		      net, sk, skb, NULL, rt->dst.dev,
 434		      dst_output);
 435	if (err > 0)
 436		err = net_xmit_errno(err);
 437	if (err)
 438		goto error;
 439out:
 440	return 0;
 441
 442error_free:
 443	kfree_skb(skb);
 444error:
 445	IP_INC_STATS(net, IPSTATS_MIB_OUTDISCARDS);
 446	if (err == -ENOBUFS && !inet->recverr)
 447		err = 0;
 448	return err;
 449}
 450
 451static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4)
 452{
 453	int err;
 
 
 
 
 454
 455	if (fl4->flowi4_proto != IPPROTO_ICMP)
 456		return 0;
 457
 458	/* We only need the first two bytes. */
 459	rfv->hlen = 2;
 460
 461	err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
 462	if (err)
 463		return err;
 464
 465	fl4->fl4_icmp_type = rfv->hdr.icmph.type;
 466	fl4->fl4_icmp_code = rfv->hdr.icmph.code;
 467
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 468	return 0;
 469}
 470
 471static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
 472		       struct sk_buff *skb)
 473{
 474	struct raw_frag_vec *rfv = from;
 475
 476	if (offset < rfv->hlen) {
 477		int copy = min(rfv->hlen - offset, len);
 478
 479		if (skb->ip_summed == CHECKSUM_PARTIAL)
 480			memcpy(to, rfv->hdr.c + offset, copy);
 481		else
 482			skb->csum = csum_block_add(
 483				skb->csum,
 484				csum_partial_copy_nocheck(rfv->hdr.c + offset,
 485							  to, copy, 0),
 486				odd);
 487
 488		odd = 0;
 489		offset += copy;
 490		to += copy;
 491		len -= copy;
 492
 493		if (!len)
 494			return 0;
 495	}
 496
 497	offset -= rfv->hlen;
 498
 499	return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
 500}
 501
 502static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 503{
 504	struct inet_sock *inet = inet_sk(sk);
 505	struct net *net = sock_net(sk);
 506	struct ipcm_cookie ipc;
 507	struct rtable *rt = NULL;
 508	struct flowi4 fl4;
 509	int free = 0;
 510	__be32 daddr;
 511	__be32 saddr;
 512	u8  tos;
 513	int err;
 514	struct ip_options_data opt_copy;
 515	struct raw_frag_vec rfv;
 516	int hdrincl;
 517
 518	err = -EMSGSIZE;
 519	if (len > 0xFFFF)
 520		goto out;
 521
 522	/* hdrincl should be READ_ONCE(inet->hdrincl)
 523	 * but READ_ONCE() doesn't work with bit fields.
 524	 * Doing this indirectly yields the same result.
 525	 */
 526	hdrincl = inet->hdrincl;
 527	hdrincl = READ_ONCE(hdrincl);
 528	/*
 529	 *	Check the flags.
 530	 */
 531
 532	err = -EOPNOTSUPP;
 533	if (msg->msg_flags & MSG_OOB)	/* Mirror BSD error message */
 534		goto out;               /* compatibility */
 535
 536	/*
 537	 *	Get and verify the address.
 538	 */
 539
 540	if (msg->msg_namelen) {
 541		DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
 542		err = -EINVAL;
 543		if (msg->msg_namelen < sizeof(*usin))
 544			goto out;
 545		if (usin->sin_family != AF_INET) {
 546			pr_info_once("%s: %s forgot to set AF_INET. Fix it!\n",
 547				     __func__, current->comm);
 548			err = -EAFNOSUPPORT;
 549			if (usin->sin_family)
 550				goto out;
 551		}
 552		daddr = usin->sin_addr.s_addr;
 553		/* ANK: I did not forget to get protocol from port field.
 554		 * I just do not know, who uses this weirdness.
 555		 * IP_HDRINCL is much more convenient.
 556		 */
 557	} else {
 558		err = -EDESTADDRREQ;
 559		if (sk->sk_state != TCP_ESTABLISHED)
 560			goto out;
 561		daddr = inet->inet_daddr;
 562	}
 563
 564	ipc.sockc.tsflags = sk->sk_tsflags;
 565	ipc.addr = inet->inet_saddr;
 566	ipc.opt = NULL;
 567	ipc.tx_flags = 0;
 568	ipc.ttl = 0;
 569	ipc.tos = -1;
 570	ipc.oif = sk->sk_bound_dev_if;
 571
 572	if (msg->msg_controllen) {
 573		err = ip_cmsg_send(sk, msg, &ipc, false);
 574		if (unlikely(err)) {
 575			kfree(ipc.opt);
 576			goto out;
 577		}
 578		if (ipc.opt)
 579			free = 1;
 580	}
 581
 582	saddr = ipc.addr;
 583	ipc.addr = daddr;
 584
 585	if (!ipc.opt) {
 586		struct ip_options_rcu *inet_opt;
 587
 588		rcu_read_lock();
 589		inet_opt = rcu_dereference(inet->inet_opt);
 590		if (inet_opt) {
 591			memcpy(&opt_copy, inet_opt,
 592			       sizeof(*inet_opt) + inet_opt->opt.optlen);
 593			ipc.opt = &opt_copy.opt;
 594		}
 595		rcu_read_unlock();
 596	}
 597
 598	if (ipc.opt) {
 599		err = -EINVAL;
 600		/* Linux does not mangle headers on raw sockets,
 601		 * so that IP options + IP_HDRINCL is non-sense.
 602		 */
 603		if (hdrincl)
 604			goto done;
 605		if (ipc.opt->opt.srr) {
 606			if (!daddr)
 607				goto done;
 608			daddr = ipc.opt->opt.faddr;
 609		}
 610	}
 611	tos = get_rtconn_flags(&ipc, sk);
 612	if (msg->msg_flags & MSG_DONTROUTE)
 613		tos |= RTO_ONLINK;
 614
 615	if (ipv4_is_multicast(daddr)) {
 616		if (!ipc.oif)
 617			ipc.oif = inet->mc_index;
 618		if (!saddr)
 619			saddr = inet->mc_addr;
 620	} else if (!ipc.oif) {
 621		ipc.oif = inet->uc_index;
 622	} else if (ipv4_is_lbcast(daddr) && inet->uc_index) {
 623		/* oif is set, packet is to local broadcast and
 624		 * and uc_index is set. oif is most likely set
 625		 * by sk_bound_dev_if. If uc_index != oif check if the
 626		 * oif is an L3 master and uc_index is an L3 slave.
 627		 * If so, we want to allow the send using the uc_index.
 628		 */
 629		if (ipc.oif != inet->uc_index &&
 630		    ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
 631							      inet->uc_index)) {
 632			ipc.oif = inet->uc_index;
 633		}
 634	}
 635
 636	flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
 637			   RT_SCOPE_UNIVERSE,
 638			   hdrincl ? IPPROTO_RAW : sk->sk_protocol,
 639			   inet_sk_flowi_flags(sk) |
 640			    (hdrincl ? FLOWI_FLAG_KNOWN_NH : 0),
 641			   daddr, saddr, 0, 0, sk->sk_uid);
 642
 643	if (!hdrincl) {
 644		rfv.msg = msg;
 645		rfv.hlen = 0;
 646
 647		err = raw_probe_proto_opt(&rfv, &fl4);
 
 648		if (err)
 649			goto done;
 650	}
 651
 652	security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
 653	rt = ip_route_output_flow(net, &fl4, sk);
 654	if (IS_ERR(rt)) {
 655		err = PTR_ERR(rt);
 656		rt = NULL;
 657		goto done;
 658	}
 659
 660	err = -EACCES;
 661	if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
 662		goto done;
 663
 664	if (msg->msg_flags & MSG_CONFIRM)
 665		goto do_confirm;
 666back_from_confirm:
 667
 668	if (hdrincl)
 669		err = raw_send_hdrinc(sk, &fl4, msg, len,
 670				      &rt, msg->msg_flags, &ipc.sockc);
 671
 672	 else {
 673		sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags);
 674
 675		if (!ipc.addr)
 676			ipc.addr = fl4.daddr;
 677		lock_sock(sk);
 678		err = ip_append_data(sk, &fl4, raw_getfrag,
 679				     &rfv, len, 0,
 680				     &ipc, &rt, msg->msg_flags);
 681		if (err)
 682			ip_flush_pending_frames(sk);
 683		else if (!(msg->msg_flags & MSG_MORE)) {
 684			err = ip_push_pending_frames(sk, &fl4);
 685			if (err == -ENOBUFS && !inet->recverr)
 686				err = 0;
 687		}
 688		release_sock(sk);
 689	}
 690done:
 691	if (free)
 692		kfree(ipc.opt);
 693	ip_rt_put(rt);
 694
 695out:
 696	if (err < 0)
 697		return err;
 698	return len;
 699
 700do_confirm:
 701	if (msg->msg_flags & MSG_PROBE)
 702		dst_confirm_neigh(&rt->dst, &fl4.daddr);
 703	if (!(msg->msg_flags & MSG_PROBE) || len)
 704		goto back_from_confirm;
 705	err = 0;
 706	goto done;
 707}
 708
 709static void raw_close(struct sock *sk, long timeout)
 710{
 711	/*
 712	 * Raw sockets may have direct kernel references. Kill them.
 713	 */
 714	ip_ra_control(sk, 0, NULL);
 715
 716	sk_common_release(sk);
 717}
 718
 719static void raw_destroy(struct sock *sk)
 720{
 721	lock_sock(sk);
 722	ip_flush_pending_frames(sk);
 723	release_sock(sk);
 724}
 725
 726/* This gets rid of all the nasties in af_inet. -DaveM */
 727static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
 728{
 729	struct inet_sock *inet = inet_sk(sk);
 730	struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
 731	u32 tb_id = RT_TABLE_LOCAL;
 732	int ret = -EINVAL;
 733	int chk_addr_ret;
 734
 735	if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
 736		goto out;
 737
 738	if (sk->sk_bound_dev_if)
 739		tb_id = l3mdev_fib_table_by_index(sock_net(sk),
 740						 sk->sk_bound_dev_if) ? : tb_id;
 741
 742	chk_addr_ret = inet_addr_type_table(sock_net(sk), addr->sin_addr.s_addr,
 743					    tb_id);
 744
 745	ret = -EADDRNOTAVAIL;
 746	if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
 747	    chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
 748		goto out;
 749	inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
 750	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
 751		inet->inet_saddr = 0;  /* Use device */
 752	sk_dst_reset(sk);
 753	ret = 0;
 754out:	return ret;
 755}
 756
 757/*
 758 *	This should be easy, if there is something there
 759 *	we return it, otherwise we block.
 760 */
 761
 762static int raw_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
 763		       int noblock, int flags, int *addr_len)
 764{
 765	struct inet_sock *inet = inet_sk(sk);
 766	size_t copied = 0;
 767	int err = -EOPNOTSUPP;
 768	DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
 769	struct sk_buff *skb;
 770
 771	if (flags & MSG_OOB)
 772		goto out;
 773
 774	if (flags & MSG_ERRQUEUE) {
 775		err = ip_recv_error(sk, msg, len, addr_len);
 776		goto out;
 777	}
 778
 779	skb = skb_recv_datagram(sk, flags, noblock, &err);
 780	if (!skb)
 781		goto out;
 782
 783	copied = skb->len;
 784	if (len < copied) {
 785		msg->msg_flags |= MSG_TRUNC;
 786		copied = len;
 787	}
 788
 789	err = skb_copy_datagram_msg(skb, 0, msg, copied);
 790	if (err)
 791		goto done;
 792
 793	sock_recv_ts_and_drops(msg, sk, skb);
 794
 795	/* Copy the address. */
 796	if (sin) {
 797		sin->sin_family = AF_INET;
 798		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
 799		sin->sin_port = 0;
 800		memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
 801		*addr_len = sizeof(*sin);
 802	}
 803	if (inet->cmsg_flags)
 804		ip_cmsg_recv(msg, skb);
 805	if (flags & MSG_TRUNC)
 806		copied = skb->len;
 807done:
 808	skb_free_datagram(sk, skb);
 809out:
 810	if (err)
 811		return err;
 812	return copied;
 813}
 814
 815static int raw_init(struct sock *sk)
 816{
 817	struct raw_sock *rp = raw_sk(sk);
 818
 819	if (inet_sk(sk)->inet_num == IPPROTO_ICMP)
 820		memset(&rp->filter, 0, sizeof(rp->filter));
 821	return 0;
 822}
 823
 824static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
 825{
 826	if (optlen > sizeof(struct icmp_filter))
 827		optlen = sizeof(struct icmp_filter);
 828	if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
 829		return -EFAULT;
 830	return 0;
 831}
 832
 833static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
 834{
 835	int len, ret = -EFAULT;
 836
 837	if (get_user(len, optlen))
 838		goto out;
 839	ret = -EINVAL;
 840	if (len < 0)
 841		goto out;
 842	if (len > sizeof(struct icmp_filter))
 843		len = sizeof(struct icmp_filter);
 844	ret = -EFAULT;
 845	if (put_user(len, optlen) ||
 846	    copy_to_user(optval, &raw_sk(sk)->filter, len))
 847		goto out;
 848	ret = 0;
 849out:	return ret;
 850}
 851
 852static int do_raw_setsockopt(struct sock *sk, int level, int optname,
 853			  char __user *optval, unsigned int optlen)
 854{
 855	if (optname == ICMP_FILTER) {
 856		if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 857			return -EOPNOTSUPP;
 858		else
 859			return raw_seticmpfilter(sk, optval, optlen);
 860	}
 861	return -ENOPROTOOPT;
 862}
 863
 864static int raw_setsockopt(struct sock *sk, int level, int optname,
 865			  char __user *optval, unsigned int optlen)
 866{
 867	if (level != SOL_RAW)
 868		return ip_setsockopt(sk, level, optname, optval, optlen);
 869	return do_raw_setsockopt(sk, level, optname, optval, optlen);
 870}
 871
 872#ifdef CONFIG_COMPAT
 873static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
 874				 char __user *optval, unsigned int optlen)
 875{
 876	if (level != SOL_RAW)
 877		return compat_ip_setsockopt(sk, level, optname, optval, optlen);
 878	return do_raw_setsockopt(sk, level, optname, optval, optlen);
 879}
 880#endif
 881
 882static int do_raw_getsockopt(struct sock *sk, int level, int optname,
 883			  char __user *optval, int __user *optlen)
 884{
 885	if (optname == ICMP_FILTER) {
 886		if (inet_sk(sk)->inet_num != IPPROTO_ICMP)
 887			return -EOPNOTSUPP;
 888		else
 889			return raw_geticmpfilter(sk, optval, optlen);
 890	}
 891	return -ENOPROTOOPT;
 892}
 893
 894static int raw_getsockopt(struct sock *sk, int level, int optname,
 895			  char __user *optval, int __user *optlen)
 896{
 897	if (level != SOL_RAW)
 898		return ip_getsockopt(sk, level, optname, optval, optlen);
 899	return do_raw_getsockopt(sk, level, optname, optval, optlen);
 900}
 901
 902#ifdef CONFIG_COMPAT
 903static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
 904				 char __user *optval, int __user *optlen)
 905{
 906	if (level != SOL_RAW)
 907		return compat_ip_getsockopt(sk, level, optname, optval, optlen);
 908	return do_raw_getsockopt(sk, level, optname, optval, optlen);
 909}
 910#endif
 911
 912static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
 913{
 914	switch (cmd) {
 915	case SIOCOUTQ: {
 916		int amount = sk_wmem_alloc_get(sk);
 917
 918		return put_user(amount, (int __user *)arg);
 919	}
 920	case SIOCINQ: {
 921		struct sk_buff *skb;
 922		int amount = 0;
 923
 924		spin_lock_bh(&sk->sk_receive_queue.lock);
 925		skb = skb_peek(&sk->sk_receive_queue);
 926		if (skb)
 927			amount = skb->len;
 928		spin_unlock_bh(&sk->sk_receive_queue.lock);
 929		return put_user(amount, (int __user *)arg);
 930	}
 931
 932	default:
 933#ifdef CONFIG_IP_MROUTE
 934		return ipmr_ioctl(sk, cmd, (void __user *)arg);
 935#else
 936		return -ENOIOCTLCMD;
 937#endif
 938	}
 939}
 940
 941#ifdef CONFIG_COMPAT
 942static int compat_raw_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
 943{
 944	switch (cmd) {
 945	case SIOCOUTQ:
 946	case SIOCINQ:
 947		return -ENOIOCTLCMD;
 948	default:
 949#ifdef CONFIG_IP_MROUTE
 950		return ipmr_compat_ioctl(sk, cmd, compat_ptr(arg));
 951#else
 952		return -ENOIOCTLCMD;
 953#endif
 954	}
 955}
 956#endif
 957
 958int raw_abort(struct sock *sk, int err)
 959{
 960	lock_sock(sk);
 961
 962	sk->sk_err = err;
 963	sk->sk_error_report(sk);
 964	__udp_disconnect(sk, 0);
 965
 966	release_sock(sk);
 967
 968	return 0;
 969}
 970EXPORT_SYMBOL_GPL(raw_abort);
 971
 972struct proto raw_prot = {
 973	.name		   = "RAW",
 974	.owner		   = THIS_MODULE,
 975	.close		   = raw_close,
 976	.destroy	   = raw_destroy,
 977	.connect	   = ip4_datagram_connect,
 978	.disconnect	   = __udp_disconnect,
 979	.ioctl		   = raw_ioctl,
 980	.init		   = raw_init,
 981	.setsockopt	   = raw_setsockopt,
 982	.getsockopt	   = raw_getsockopt,
 983	.sendmsg	   = raw_sendmsg,
 984	.recvmsg	   = raw_recvmsg,
 985	.bind		   = raw_bind,
 986	.backlog_rcv	   = raw_rcv_skb,
 987	.release_cb	   = ip4_datagram_release_cb,
 988	.hash		   = raw_hash_sk,
 989	.unhash		   = raw_unhash_sk,
 990	.obj_size	   = sizeof(struct raw_sock),
 991	.useroffset	   = offsetof(struct raw_sock, filter),
 992	.usersize	   = sizeof_field(struct raw_sock, filter),
 993	.h.raw_hash	   = &raw_v4_hashinfo,
 994#ifdef CONFIG_COMPAT
 995	.compat_setsockopt = compat_raw_setsockopt,
 996	.compat_getsockopt = compat_raw_getsockopt,
 997	.compat_ioctl	   = compat_raw_ioctl,
 998#endif
 999	.diag_destroy	   = raw_abort,
1000};
1001
1002#ifdef CONFIG_PROC_FS
1003static struct sock *raw_get_first(struct seq_file *seq)
1004{
1005	struct sock *sk;
1006	struct raw_iter_state *state = raw_seq_private(seq);
1007
1008	for (state->bucket = 0; state->bucket < RAW_HTABLE_SIZE;
1009			++state->bucket) {
1010		sk_for_each(sk, &state->h->ht[state->bucket])
1011			if (sock_net(sk) == seq_file_net(seq))
1012				goto found;
1013	}
1014	sk = NULL;
1015found:
1016	return sk;
1017}
1018
1019static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
1020{
1021	struct raw_iter_state *state = raw_seq_private(seq);
1022
1023	do {
1024		sk = sk_next(sk);
1025try_again:
1026		;
1027	} while (sk && sock_net(sk) != seq_file_net(seq));
1028
1029	if (!sk && ++state->bucket < RAW_HTABLE_SIZE) {
1030		sk = sk_head(&state->h->ht[state->bucket]);
1031		goto try_again;
1032	}
1033	return sk;
1034}
1035
1036static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
1037{
1038	struct sock *sk = raw_get_first(seq);
1039
1040	if (sk)
1041		while (pos && (sk = raw_get_next(seq, sk)) != NULL)
1042			--pos;
1043	return pos ? NULL : sk;
1044}
1045
1046void *raw_seq_start(struct seq_file *seq, loff_t *pos)
1047{
1048	struct raw_iter_state *state = raw_seq_private(seq);
1049
1050	read_lock(&state->h->lock);
1051	return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
1052}
1053EXPORT_SYMBOL_GPL(raw_seq_start);
1054
1055void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1056{
1057	struct sock *sk;
1058
1059	if (v == SEQ_START_TOKEN)
1060		sk = raw_get_first(seq);
1061	else
1062		sk = raw_get_next(seq, v);
1063	++*pos;
1064	return sk;
1065}
1066EXPORT_SYMBOL_GPL(raw_seq_next);
1067
1068void raw_seq_stop(struct seq_file *seq, void *v)
1069{
1070	struct raw_iter_state *state = raw_seq_private(seq);
1071
1072	read_unlock(&state->h->lock);
1073}
1074EXPORT_SYMBOL_GPL(raw_seq_stop);
1075
1076static void raw_sock_seq_show(struct seq_file *seq, struct sock *sp, int i)
1077{
1078	struct inet_sock *inet = inet_sk(sp);
1079	__be32 dest = inet->inet_daddr,
1080	       src = inet->inet_rcv_saddr;
1081	__u16 destp = 0,
1082	      srcp  = inet->inet_num;
1083
1084	seq_printf(seq, "%4d: %08X:%04X %08X:%04X"
1085		" %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n",
1086		i, src, srcp, dest, destp, sp->sk_state,
1087		sk_wmem_alloc_get(sp),
1088		sk_rmem_alloc_get(sp),
1089		0, 0L, 0,
1090		from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)),
1091		0, sock_i_ino(sp),
1092		refcount_read(&sp->sk_refcnt), sp, atomic_read(&sp->sk_drops));
1093}
1094
1095static int raw_seq_show(struct seq_file *seq, void *v)
1096{
1097	if (v == SEQ_START_TOKEN)
1098		seq_printf(seq, "  sl  local_address rem_address   st tx_queue "
1099				"rx_queue tr tm->when retrnsmt   uid  timeout "
1100				"inode ref pointer drops\n");
1101	else
1102		raw_sock_seq_show(seq, v, raw_seq_private(seq)->bucket);
1103	return 0;
1104}
1105
1106static const struct seq_operations raw_seq_ops = {
1107	.start = raw_seq_start,
1108	.next  = raw_seq_next,
1109	.stop  = raw_seq_stop,
1110	.show  = raw_seq_show,
1111};
1112
1113int raw_seq_open(struct inode *ino, struct file *file,
1114		 struct raw_hashinfo *h, const struct seq_operations *ops)
1115{
1116	int err;
1117	struct raw_iter_state *i;
1118
1119	err = seq_open_net(ino, file, ops, sizeof(struct raw_iter_state));
1120	if (err < 0)
1121		return err;
1122
1123	i = raw_seq_private((struct seq_file *)file->private_data);
1124	i->h = h;
1125	return 0;
1126}
1127EXPORT_SYMBOL_GPL(raw_seq_open);
1128
1129static int raw_v4_seq_open(struct inode *inode, struct file *file)
1130{
1131	return raw_seq_open(inode, file, &raw_v4_hashinfo, &raw_seq_ops);
1132}
1133
1134static const struct file_operations raw_seq_fops = {
 
1135	.open	 = raw_v4_seq_open,
1136	.read	 = seq_read,
1137	.llseek	 = seq_lseek,
1138	.release = seq_release_net,
1139};
1140
1141static __net_init int raw_init_net(struct net *net)
1142{
1143	if (!proc_create("raw", 0444, net->proc_net, &raw_seq_fops))
1144		return -ENOMEM;
1145
1146	return 0;
1147}
1148
1149static __net_exit void raw_exit_net(struct net *net)
1150{
1151	remove_proc_entry("raw", net->proc_net);
1152}
1153
1154static __net_initdata struct pernet_operations raw_net_ops = {
1155	.init = raw_init_net,
1156	.exit = raw_exit_net,
1157};
1158
1159int __init raw_proc_init(void)
1160{
1161	return register_pernet_subsys(&raw_net_ops);
1162}
1163
1164void __init raw_proc_exit(void)
1165{
1166	unregister_pernet_subsys(&raw_net_ops);
1167}
1168#endif /* CONFIG_PROC_FS */