xref: /linux/net/ipv4/raw.c (revision 13abf8130139c2ccd4962a7e5a8902be5e6cb5a7) 
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  * Version:	$Id: raw.c,v 1.64 2002/02/01 22:01:04 davem Exp $
9  *
10  * Authors:	Ross Biro
11  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12  *
13  * Fixes:
14  *		Alan Cox	:	verify_area() fixed up
15  *		Alan Cox	:	ICMP error handling
16  *		Alan Cox	:	EMSGSIZE if you send too big a packet
17  *		Alan Cox	: 	Now uses generic datagrams and shared
18  *					skbuff library. No more peek crashes,
19  *					no more backlogs
20  *		Alan Cox	:	Checks sk->broadcast.
21  *		Alan Cox	:	Uses skb_free_datagram/skb_copy_datagram
22  *		Alan Cox	:	Raw passes ip options too
23  *		Alan Cox	:	Setsocketopt added
24  *		Alan Cox	:	Fixed error return for broadcasts
25  *		Alan Cox	:	Removed wake_up calls
26  *		Alan Cox	:	Use ttl/tos
27  *		Alan Cox	:	Cleaned up old debugging
28  *		Alan Cox	:	Use new kernel side addresses
29  *	Arnt Gulbrandsen	:	Fixed MSG_DONTROUTE in raw sockets.
30  *		Alan Cox	:	BSD style RAW socket demultiplexing.
31  *		Alan Cox	:	Beginnings of mrouted support.
32  *		Alan Cox	:	Added IP_HDRINCL option.
33  *		Alan Cox	:	Skip broadcast check if BSDism set.
34  *		David S. Miller	:	New socket lookup architecture.
35  *
36  *		This program is free software; you can redistribute it and/or
37  *		modify it under the terms of the GNU General Public License
38  *		as published by the Free Software Foundation; either version
39  *		2 of the License, or (at your option) any later version.
40  */
41 
42 #include <linux/config.h>
43 #include <asm/atomic.h>
44 #include <asm/byteorder.h>
45 #include <asm/current.h>
46 #include <asm/uaccess.h>
47 #include <asm/ioctls.h>
48 #include <linux/types.h>
49 #include <linux/stddef.h>
50 #include <linux/slab.h>
51 #include <linux/errno.h>
52 #include <linux/aio.h>
53 #include <linux/kernel.h>
54 #include <linux/spinlock.h>
55 #include <linux/sockios.h>
56 #include <linux/socket.h>
57 #include <linux/in.h>
58 #include <linux/mroute.h>
59 #include <linux/netdevice.h>
60 #include <linux/in_route.h>
61 #include <linux/route.h>
62 #include <linux/skbuff.h>
63 #include <net/dst.h>
64 #include <net/sock.h>
65 #include <linux/gfp.h>
66 #include <linux/ip.h>
67 #include <linux/net.h>
68 #include <net/ip.h>
69 #include <net/icmp.h>
70 #include <net/udp.h>
71 #include <net/raw.h>
72 #include <net/snmp.h>
73 #include <net/tcp_states.h>
74 #include <net/inet_common.h>
75 #include <net/checksum.h>
76 #include <net/xfrm.h>
77 #include <linux/rtnetlink.h>
78 #include <linux/proc_fs.h>
79 #include <linux/seq_file.h>
80 #include <linux/netfilter.h>
81 #include <linux/netfilter_ipv4.h>
82 
83 struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE];
84 DEFINE_RWLOCK(raw_v4_lock);
85 
86 static void raw_v4_hash(struct sock *sk)
87 {
88 	struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num &
89 						 (RAWV4_HTABLE_SIZE - 1)];
90 
91 	write_lock_bh(&raw_v4_lock);
92 	sk_add_node(sk, head);
93 	sock_prot_inc_use(sk->sk_prot);
94 	write_unlock_bh(&raw_v4_lock);
95 }
96 
97 static void raw_v4_unhash(struct sock *sk)
98 {
99  	write_lock_bh(&raw_v4_lock);
100 	if (sk_del_node_init(sk))
101 		sock_prot_dec_use(sk->sk_prot);
102 	write_unlock_bh(&raw_v4_lock);
103 }
104 
105 struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num,
106 			     unsigned long raddr, unsigned long laddr,
107 			     int dif)
108 {
109 	struct hlist_node *node;
110 
111 	sk_for_each_from(sk, node) {
112 		struct inet_sock *inet = inet_sk(sk);
113 
114 		if (inet->num == num 					&&
115 		    !(inet->daddr && inet->daddr != raddr) 		&&
116 		    !(inet->rcv_saddr && inet->rcv_saddr != laddr)	&&
117 		    !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
118 			goto found; /* gotcha */
119 	}
120 	sk = NULL;
121 found:
122 	return sk;
123 }
124 
125 /*
126  *	0 - deliver
127  *	1 - block
128  */
129 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
130 {
131 	int type;
132 
133 	if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
134 		return 1;
135 
136 	type = skb->h.icmph->type;
137 	if (type < 32) {
138 		__u32 data = raw_sk(sk)->filter.data;
139 
140 		return ((1 << type) & data) != 0;
141 	}
142 
143 	/* Do not block unknown ICMP types */
144 	return 0;
145 }
146 
147 /* IP input processing comes here for RAW socket delivery.
148  * Caller owns SKB, so we must make clones.
149  *
150  * RFC 1122: SHOULD pass TOS value up to the transport layer.
151  * -> It does. And not only TOS, but all IP header.
152  */
153 int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
154 {
155 	struct sock *sk;
156 	struct hlist_head *head;
157 	int delivered = 0;
158 
159 	read_lock(&raw_v4_lock);
160 	head = &raw_v4_htable[hash];
161 	if (hlist_empty(head))
162 		goto out;
163 	sk = __raw_v4_lookup(__sk_head(head), iph->protocol,
164 			     iph->saddr, iph->daddr,
165 			     skb->dev->ifindex);
166 
167 	while (sk) {
168 		delivered = 1;
169 		if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
170 			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
171 
172 			/* Not releasing hash table! */
173 			if (clone)
174 				raw_rcv(sk, clone);
175 		}
176 		sk = __raw_v4_lookup(sk_next(sk), iph->protocol,
177 				     iph->saddr, iph->daddr,
178 				     skb->dev->ifindex);
179 	}
180 out:
181 	read_unlock(&raw_v4_lock);
182 	return delivered;
183 }
184 
185 void raw_err (struct sock *sk, struct sk_buff *skb, u32 info)
186 {
187 	struct inet_sock *inet = inet_sk(sk);
188 	int type = skb->h.icmph->type;
189 	int code = skb->h.icmph->code;
190 	int err = 0;
191 	int harderr = 0;
192 
193 	/* Report error on raw socket, if:
194 	   1. User requested ip_recverr.
195 	   2. Socket is connected (otherwise the error indication
196 	      is useless without ip_recverr and error is hard.
197 	 */
198 	if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
199 		return;
200 
201 	switch (type) {
202 	default:
203 	case ICMP_TIME_EXCEEDED:
204 		err = EHOSTUNREACH;
205 		break;
206 	case ICMP_SOURCE_QUENCH:
207 		return;
208 	case ICMP_PARAMETERPROB:
209 		err = EPROTO;
210 		harderr = 1;
211 		break;
212 	case ICMP_DEST_UNREACH:
213 		err = EHOSTUNREACH;
214 		if (code > NR_ICMP_UNREACH)
215 			break;
216 		err = icmp_err_convert[code].errno;
217 		harderr = icmp_err_convert[code].fatal;
218 		if (code == ICMP_FRAG_NEEDED) {
219 			harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
220 			err = EMSGSIZE;
221 		}
222 	}
223 
224 	if (inet->recverr) {
225 		struct iphdr *iph = (struct iphdr*)skb->data;
226 		u8 *payload = skb->data + (iph->ihl << 2);
227 
228 		if (inet->hdrincl)
229 			payload = skb->data;
230 		ip_icmp_error(sk, skb, err, 0, info, payload);
231 	}
232 
233 	if (inet->recverr || harderr) {
234 		sk->sk_err = err;
235 		sk->sk_error_report(sk);
236 	}
237 }
238 
239 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
240 {
241 	/* Charge it to the socket. */
242 
243 	if (sock_queue_rcv_skb(sk, skb) < 0) {
244 		/* FIXME: increment a raw drops counter here */
245 		kfree_skb(skb);
246 		return NET_RX_DROP;
247 	}
248 
249 	return NET_RX_SUCCESS;
250 }
251 
252 int raw_rcv(struct sock *sk, struct sk_buff *skb)
253 {
254 	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
255 		kfree_skb(skb);
256 		return NET_RX_DROP;
257 	}
258 
259 	skb_push(skb, skb->data - skb->nh.raw);
260 
261 	raw_rcv_skb(sk, skb);
262 	return 0;
263 }
264 
265 static int raw_send_hdrinc(struct sock *sk, void *from, size_t length,
266 			struct rtable *rt,
267 			unsigned int flags)
268 {
269 	struct inet_sock *inet = inet_sk(sk);
270 	int hh_len;
271 	struct iphdr *iph;
272 	struct sk_buff *skb;
273 	int err;
274 
275 	if (length > rt->u.dst.dev->mtu) {
276 		ip_local_error(sk, EMSGSIZE, rt->rt_dst, inet->dport,
277 			       rt->u.dst.dev->mtu);
278 		return -EMSGSIZE;
279 	}
280 	if (flags&MSG_PROBE)
281 		goto out;
282 
283 	hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
284 
285 	skb = sock_alloc_send_skb(sk, length+hh_len+15,
286 				  flags&MSG_DONTWAIT, &err);
287 	if (skb == NULL)
288 		goto error;
289 	skb_reserve(skb, hh_len);
290 
291 	skb->priority = sk->sk_priority;
292 	skb->dst = dst_clone(&rt->u.dst);
293 
294 	skb->nh.iph = iph = (struct iphdr *)skb_put(skb, length);
295 
296 	skb->ip_summed = CHECKSUM_NONE;
297 
298 	skb->h.raw = skb->nh.raw;
299 	err = memcpy_fromiovecend((void *)iph, from, 0, length);
300 	if (err)
301 		goto error_fault;
302 
303 	/* We don't modify invalid header */
304 	if (length >= sizeof(*iph) && iph->ihl * 4U <= length) {
305 		if (!iph->saddr)
306 			iph->saddr = rt->rt_src;
307 		iph->check   = 0;
308 		iph->tot_len = htons(length);
309 		if (!iph->id)
310 			ip_select_ident(iph, &rt->u.dst, NULL);
311 
312 		iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
313 	}
314 
315 	err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
316 		      dst_output);
317 	if (err > 0)
318 		err = inet->recverr ? net_xmit_errno(err) : 0;
319 	if (err)
320 		goto error;
321 out:
322 	return 0;
323 
324 error_fault:
325 	err = -EFAULT;
326 	kfree_skb(skb);
327 error:
328 	IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
329 	return err;
330 }
331 
332 static void raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
333 {
334 	struct iovec *iov;
335 	u8 __user *type = NULL;
336 	u8 __user *code = NULL;
337 	int probed = 0;
338 	unsigned int i;
339 
340 	if (!msg->msg_iov)
341 		return;
342 
343 	for (i = 0; i < msg->msg_iovlen; i++) {
344 		iov = &msg->msg_iov[i];
345 		if (!iov)
346 			continue;
347 
348 		switch (fl->proto) {
349 		case IPPROTO_ICMP:
350 			/* check if one-byte field is readable or not. */
351 			if (iov->iov_base && iov->iov_len < 1)
352 				break;
353 
354 			if (!type) {
355 				type = iov->iov_base;
356 				/* check if code field is readable or not. */
357 				if (iov->iov_len > 1)
358 					code = type + 1;
359 			} else if (!code)
360 				code = iov->iov_base;
361 
362 			if (type && code) {
363 				get_user(fl->fl_icmp_type, type);
364 				__get_user(fl->fl_icmp_code, code);
365 				probed = 1;
366 			}
367 			break;
368 		default:
369 			probed = 1;
370 			break;
371 		}
372 		if (probed)
373 			break;
374 	}
375 }
376 
377 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
378 		       size_t len)
379 {
380 	struct inet_sock *inet = inet_sk(sk);
381 	struct ipcm_cookie ipc;
382 	struct rtable *rt = NULL;
383 	int free = 0;
384 	u32 daddr;
385 	u32 saddr;
386 	u8  tos;
387 	int err;
388 
389 	err = -EMSGSIZE;
390 	if (len > 0xFFFF)
391 		goto out;
392 
393 	/*
394 	 *	Check the flags.
395 	 */
396 
397 	err = -EOPNOTSUPP;
398 	if (msg->msg_flags & MSG_OOB)	/* Mirror BSD error message */
399 		goto out;               /* compatibility */
400 
401 	/*
402 	 *	Get and verify the address.
403 	 */
404 
405 	if (msg->msg_namelen) {
406 		struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name;
407 		err = -EINVAL;
408 		if (msg->msg_namelen < sizeof(*usin))
409 			goto out;
410 		if (usin->sin_family != AF_INET) {
411 			static int complained;
412 			if (!complained++)
413 				printk(KERN_INFO "%s forgot to set AF_INET in "
414 						 "raw sendmsg. Fix it!\n",
415 						 current->comm);
416 			err = -EAFNOSUPPORT;
417 			if (usin->sin_family)
418 				goto out;
419 		}
420 		daddr = usin->sin_addr.s_addr;
421 		/* ANK: I did not forget to get protocol from port field.
422 		 * I just do not know, who uses this weirdness.
423 		 * IP_HDRINCL is much more convenient.
424 		 */
425 	} else {
426 		err = -EDESTADDRREQ;
427 		if (sk->sk_state != TCP_ESTABLISHED)
428 			goto out;
429 		daddr = inet->daddr;
430 	}
431 
432 	ipc.addr = inet->saddr;
433 	ipc.opt = NULL;
434 	ipc.oif = sk->sk_bound_dev_if;
435 
436 	if (msg->msg_controllen) {
437 		err = ip_cmsg_send(msg, &ipc);
438 		if (err)
439 			goto out;
440 		if (ipc.opt)
441 			free = 1;
442 	}
443 
444 	saddr = ipc.addr;
445 	ipc.addr = daddr;
446 
447 	if (!ipc.opt)
448 		ipc.opt = inet->opt;
449 
450 	if (ipc.opt) {
451 		err = -EINVAL;
452 		/* Linux does not mangle headers on raw sockets,
453 		 * so that IP options + IP_HDRINCL is non-sense.
454 		 */
455 		if (inet->hdrincl)
456 			goto done;
457 		if (ipc.opt->srr) {
458 			if (!daddr)
459 				goto done;
460 			daddr = ipc.opt->faddr;
461 		}
462 	}
463 	tos = RT_CONN_FLAGS(sk);
464 	if (msg->msg_flags & MSG_DONTROUTE)
465 		tos |= RTO_ONLINK;
466 
467 	if (MULTICAST(daddr)) {
468 		if (!ipc.oif)
469 			ipc.oif = inet->mc_index;
470 		if (!saddr)
471 			saddr = inet->mc_addr;
472 	}
473 
474 	{
475 		struct flowi fl = { .oif = ipc.oif,
476 				    .nl_u = { .ip4_u =
477 					      { .daddr = daddr,
478 						.saddr = saddr,
479 						.tos = tos } },
480 				    .proto = inet->hdrincl ? IPPROTO_RAW :
481 					    		     sk->sk_protocol,
482 				  };
483 		if (!inet->hdrincl)
484 			raw_probe_proto_opt(&fl, msg);
485 
486 		err = ip_route_output_flow(&rt, &fl, sk, !(msg->msg_flags&MSG_DONTWAIT));
487 	}
488 	if (err)
489 		goto done;
490 
491 	err = -EACCES;
492 	if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
493 		goto done;
494 
495 	if (msg->msg_flags & MSG_CONFIRM)
496 		goto do_confirm;
497 back_from_confirm:
498 
499 	if (inet->hdrincl)
500 		err = raw_send_hdrinc(sk, msg->msg_iov, len,
501 					rt, msg->msg_flags);
502 
503 	 else {
504 		if (!ipc.addr)
505 			ipc.addr = rt->rt_dst;
506 		lock_sock(sk);
507 		err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
508 					&ipc, rt, msg->msg_flags);
509 		if (err)
510 			ip_flush_pending_frames(sk);
511 		else if (!(msg->msg_flags & MSG_MORE))
512 			err = ip_push_pending_frames(sk);
513 		release_sock(sk);
514 	}
515 done:
516 	if (free)
517 		kfree(ipc.opt);
518 	ip_rt_put(rt);
519 
520 out:
521 	if (err < 0)
522 		return err;
523 	return len;
524 
525 do_confirm:
526 	dst_confirm(&rt->u.dst);
527 	if (!(msg->msg_flags & MSG_PROBE) || len)
528 		goto back_from_confirm;
529 	err = 0;
530 	goto done;
531 }
532 
533 static void raw_close(struct sock *sk, long timeout)
534 {
535         /*
536 	 * Raw sockets may have direct kernel refereneces. Kill them.
537 	 */
538 	ip_ra_control(sk, 0, NULL);
539 
540 	sk_common_release(sk);
541 }
542 
543 /* This gets rid of all the nasties in af_inet. -DaveM */
544 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
545 {
546 	struct inet_sock *inet = inet_sk(sk);
547 	struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
548 	int ret = -EINVAL;
549 	int chk_addr_ret;
550 
551 	if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
552 		goto out;
553 	chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
554 	ret = -EADDRNOTAVAIL;
555 	if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
556 	    chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
557 		goto out;
558 	inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
559 	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
560 		inet->saddr = 0;  /* Use device */
561 	sk_dst_reset(sk);
562 	ret = 0;
563 out:	return ret;
564 }
565 
566 /*
567  *	This should be easy, if there is something there
568  *	we return it, otherwise we block.
569  */
570 
571 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
572 		       size_t len, int noblock, int flags, int *addr_len)
573 {
574 	struct inet_sock *inet = inet_sk(sk);
575 	size_t copied = 0;
576 	int err = -EOPNOTSUPP;
577 	struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
578 	struct sk_buff *skb;
579 
580 	if (flags & MSG_OOB)
581 		goto out;
582 
583 	if (addr_len)
584 		*addr_len = sizeof(*sin);
585 
586 	if (flags & MSG_ERRQUEUE) {
587 		err = ip_recv_error(sk, msg, len);
588 		goto out;
589 	}
590 
591 	skb = skb_recv_datagram(sk, flags, noblock, &err);
592 	if (!skb)
593 		goto out;
594 
595 	copied = skb->len;
596 	if (len < copied) {
597 		msg->msg_flags |= MSG_TRUNC;
598 		copied = len;
599 	}
600 
601 	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
602 	if (err)
603 		goto done;
604 
605 	sock_recv_timestamp(msg, sk, skb);
606 
607 	/* Copy the address. */
608 	if (sin) {
609 		sin->sin_family = AF_INET;
610 		sin->sin_addr.s_addr = skb->nh.iph->saddr;
611 		memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
612 	}
613 	if (inet->cmsg_flags)
614 		ip_cmsg_recv(msg, skb);
615 	if (flags & MSG_TRUNC)
616 		copied = skb->len;
617 done:
618 	skb_free_datagram(sk, skb);
619 out:
620 	if (err)
621 		return err;
622 	return copied;
623 }
624 
625 static int raw_init(struct sock *sk)
626 {
627 	struct raw_sock *rp = raw_sk(sk);
628 
629 	if (inet_sk(sk)->num == IPPROTO_ICMP)
630 		memset(&rp->filter, 0, sizeof(rp->filter));
631 	return 0;
632 }
633 
634 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
635 {
636 	if (optlen > sizeof(struct icmp_filter))
637 		optlen = sizeof(struct icmp_filter);
638 	if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
639 		return -EFAULT;
640 	return 0;
641 }
642 
643 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
644 {
645 	int len, ret = -EFAULT;
646 
647 	if (get_user(len, optlen))
648 		goto out;
649 	ret = -EINVAL;
650 	if (len < 0)
651 		goto out;
652 	if (len > sizeof(struct icmp_filter))
653 		len = sizeof(struct icmp_filter);
654 	ret = -EFAULT;
655 	if (put_user(len, optlen) ||
656 	    copy_to_user(optval, &raw_sk(sk)->filter, len))
657 		goto out;
658 	ret = 0;
659 out:	return ret;
660 }
661 
662 static int raw_setsockopt(struct sock *sk, int level, int optname,
663 			  char __user *optval, int optlen)
664 {
665 	if (level != SOL_RAW)
666 		return ip_setsockopt(sk, level, optname, optval, optlen);
667 
668 	if (optname == ICMP_FILTER) {
669 		if (inet_sk(sk)->num != IPPROTO_ICMP)
670 			return -EOPNOTSUPP;
671 		else
672 			return raw_seticmpfilter(sk, optval, optlen);
673 	}
674 	return -ENOPROTOOPT;
675 }
676 
677 static int raw_getsockopt(struct sock *sk, int level, int optname,
678 			  char __user *optval, int __user *optlen)
679 {
680 	if (level != SOL_RAW)
681 		return ip_getsockopt(sk, level, optname, optval, optlen);
682 
683 	if (optname == ICMP_FILTER) {
684 		if (inet_sk(sk)->num != IPPROTO_ICMP)
685 			return -EOPNOTSUPP;
686 		else
687 			return raw_geticmpfilter(sk, optval, optlen);
688 	}
689 	return -ENOPROTOOPT;
690 }
691 
692 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
693 {
694 	switch (cmd) {
695 		case SIOCOUTQ: {
696 			int amount = atomic_read(&sk->sk_wmem_alloc);
697 			return put_user(amount, (int __user *)arg);
698 		}
699 		case SIOCINQ: {
700 			struct sk_buff *skb;
701 			int amount = 0;
702 
703 			spin_lock_bh(&sk->sk_receive_queue.lock);
704 			skb = skb_peek(&sk->sk_receive_queue);
705 			if (skb != NULL)
706 				amount = skb->len;
707 			spin_unlock_bh(&sk->sk_receive_queue.lock);
708 			return put_user(amount, (int __user *)arg);
709 		}
710 
711 		default:
712 #ifdef CONFIG_IP_MROUTE
713 			return ipmr_ioctl(sk, cmd, (void __user *)arg);
714 #else
715 			return -ENOIOCTLCMD;
716 #endif
717 	}
718 }
719 
720 struct proto raw_prot = {
721 	.name =		"RAW",
722 	.owner =	THIS_MODULE,
723 	.close =	raw_close,
724 	.connect =	ip4_datagram_connect,
725 	.disconnect =	udp_disconnect,
726 	.ioctl =	raw_ioctl,
727 	.init =		raw_init,
728 	.setsockopt =	raw_setsockopt,
729 	.getsockopt =	raw_getsockopt,
730 	.sendmsg =	raw_sendmsg,
731 	.recvmsg =	raw_recvmsg,
732 	.bind =		raw_bind,
733 	.backlog_rcv =	raw_rcv_skb,
734 	.hash =		raw_v4_hash,
735 	.unhash =	raw_v4_unhash,
736 	.obj_size =	sizeof(struct raw_sock),
737 };
738 
739 #ifdef CONFIG_PROC_FS
740 struct raw_iter_state {
741 	int bucket;
742 };
743 
744 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private)
745 
746 static struct sock *raw_get_first(struct seq_file *seq)
747 {
748 	struct sock *sk;
749 	struct raw_iter_state* state = raw_seq_private(seq);
750 
751 	for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) {
752 		struct hlist_node *node;
753 
754 		sk_for_each(sk, node, &raw_v4_htable[state->bucket])
755 			if (sk->sk_family == PF_INET)
756 				goto found;
757 	}
758 	sk = NULL;
759 found:
760 	return sk;
761 }
762 
763 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
764 {
765 	struct raw_iter_state* state = raw_seq_private(seq);
766 
767 	do {
768 		sk = sk_next(sk);
769 try_again:
770 		;
771 	} while (sk && sk->sk_family != PF_INET);
772 
773 	if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) {
774 		sk = sk_head(&raw_v4_htable[state->bucket]);
775 		goto try_again;
776 	}
777 	return sk;
778 }
779 
780 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
781 {
782 	struct sock *sk = raw_get_first(seq);
783 
784 	if (sk)
785 		while (pos && (sk = raw_get_next(seq, sk)) != NULL)
786 			--pos;
787 	return pos ? NULL : sk;
788 }
789 
790 static void *raw_seq_start(struct seq_file *seq, loff_t *pos)
791 {
792 	read_lock(&raw_v4_lock);
793 	return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
794 }
795 
796 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
797 {
798 	struct sock *sk;
799 
800 	if (v == SEQ_START_TOKEN)
801 		sk = raw_get_first(seq);
802 	else
803 		sk = raw_get_next(seq, v);
804 	++*pos;
805 	return sk;
806 }
807 
808 static void raw_seq_stop(struct seq_file *seq, void *v)
809 {
810 	read_unlock(&raw_v4_lock);
811 }
812 
813 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i)
814 {
815 	struct inet_sock *inet = inet_sk(sp);
816 	unsigned int dest = inet->daddr,
817 		     src = inet->rcv_saddr;
818 	__u16 destp = 0,
819 	      srcp  = inet->num;
820 
821 	sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
822 		" %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
823 		i, src, srcp, dest, destp, sp->sk_state,
824 		atomic_read(&sp->sk_wmem_alloc),
825 		atomic_read(&sp->sk_rmem_alloc),
826 		0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
827 		atomic_read(&sp->sk_refcnt), sp);
828 	return tmpbuf;
829 }
830 
831 static int raw_seq_show(struct seq_file *seq, void *v)
832 {
833 	char tmpbuf[129];
834 
835 	if (v == SEQ_START_TOKEN)
836 		seq_printf(seq, "%-127s\n",
837 			       "  sl  local_address rem_address   st tx_queue "
838 			       "rx_queue tr tm->when retrnsmt   uid  timeout "
839 			       "inode");
840 	else {
841 		struct raw_iter_state *state = raw_seq_private(seq);
842 
843 		seq_printf(seq, "%-127s\n",
844 			   get_raw_sock(v, tmpbuf, state->bucket));
845 	}
846 	return 0;
847 }
848 
849 static struct seq_operations raw_seq_ops = {
850 	.start = raw_seq_start,
851 	.next  = raw_seq_next,
852 	.stop  = raw_seq_stop,
853 	.show  = raw_seq_show,
854 };
855 
856 static int raw_seq_open(struct inode *inode, struct file *file)
857 {
858 	struct seq_file *seq;
859 	int rc = -ENOMEM;
860 	struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
861 
862 	if (!s)
863 		goto out;
864 	rc = seq_open(file, &raw_seq_ops);
865 	if (rc)
866 		goto out_kfree;
867 
868 	seq = file->private_data;
869 	seq->private = s;
870 	memset(s, 0, sizeof(*s));
871 out:
872 	return rc;
873 out_kfree:
874 	kfree(s);
875 	goto out;
876 }
877 
878 static struct file_operations raw_seq_fops = {
879 	.owner	 = THIS_MODULE,
880 	.open	 = raw_seq_open,
881 	.read	 = seq_read,
882 	.llseek	 = seq_lseek,
883 	.release = seq_release_private,
884 };
885 
886 int __init raw_proc_init(void)
887 {
888 	if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops))
889 		return -ENOMEM;
890 	return 0;
891 }
892 
893 void __init raw_proc_exit(void)
894 {
895 	proc_net_remove("raw");
896 }
897 #endif /* CONFIG_PROC_FS */
898