xref: /openbmc/linux/net/ipv4/raw.c (revision e868d61272caa648214046a096e5a6bfc068dc8c)
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/types.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/stddef.h>
49 #include <linux/slab.h>
50 #include <linux/errno.h>
51 #include <linux/aio.h>
52 #include <linux/kernel.h>
53 #include <linux/spinlock.h>
54 #include <linux/sockios.h>
55 #include <linux/socket.h>
56 #include <linux/in.h>
57 #include <linux/mroute.h>
58 #include <linux/netdevice.h>
59 #include <linux/in_route.h>
60 #include <linux/route.h>
61 #include <linux/skbuff.h>
62 #include <net/dst.h>
63 #include <net/sock.h>
64 #include <linux/gfp.h>
65 #include <linux/ip.h>
66 #include <linux/net.h>
67 #include <net/ip.h>
68 #include <net/icmp.h>
69 #include <net/udp.h>
70 #include <net/raw.h>
71 #include <net/snmp.h>
72 #include <net/tcp_states.h>
73 #include <net/inet_common.h>
74 #include <net/checksum.h>
75 #include <net/xfrm.h>
76 #include <linux/rtnetlink.h>
77 #include <linux/proc_fs.h>
78 #include <linux/seq_file.h>
79 #include <linux/netfilter.h>
80 #include <linux/netfilter_ipv4.h>
81 
82 struct hlist_head raw_v4_htable[RAWV4_HTABLE_SIZE];
83 DEFINE_RWLOCK(raw_v4_lock);
84 
85 static void raw_v4_hash(struct sock *sk)
86 {
87 	struct hlist_head *head = &raw_v4_htable[inet_sk(sk)->num &
88 						 (RAWV4_HTABLE_SIZE - 1)];
89 
90 	write_lock_bh(&raw_v4_lock);
91 	sk_add_node(sk, head);
92 	sock_prot_inc_use(sk->sk_prot);
93 	write_unlock_bh(&raw_v4_lock);
94 }
95 
96 static void raw_v4_unhash(struct sock *sk)
97 {
98 	write_lock_bh(&raw_v4_lock);
99 	if (sk_del_node_init(sk))
100 		sock_prot_dec_use(sk->sk_prot);
101 	write_unlock_bh(&raw_v4_lock);
102 }
103 
104 struct sock *__raw_v4_lookup(struct sock *sk, unsigned short num,
105 			     __be32 raddr, __be32 laddr,
106 			     int dif)
107 {
108 	struct hlist_node *node;
109 
110 	sk_for_each_from(sk, node) {
111 		struct inet_sock *inet = inet_sk(sk);
112 
113 		if (inet->num == num 					&&
114 		    !(inet->daddr && inet->daddr != raddr) 		&&
115 		    !(inet->rcv_saddr && inet->rcv_saddr != laddr)	&&
116 		    !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
117 			goto found; /* gotcha */
118 	}
119 	sk = NULL;
120 found:
121 	return sk;
122 }
123 
124 /*
125  *	0 - deliver
126  *	1 - block
127  */
128 static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
129 {
130 	int type;
131 
132 	if (!pskb_may_pull(skb, sizeof(struct icmphdr)))
133 		return 1;
134 
135 	type = icmp_hdr(skb)->type;
136 	if (type < 32) {
137 		__u32 data = raw_sk(sk)->filter.data;
138 
139 		return ((1 << type) & data) != 0;
140 	}
141 
142 	/* Do not block unknown ICMP types */
143 	return 0;
144 }
145 
146 /* IP input processing comes here for RAW socket delivery.
147  * Caller owns SKB, so we must make clones.
148  *
149  * RFC 1122: SHOULD pass TOS value up to the transport layer.
150  * -> It does. And not only TOS, but all IP header.
151  */
152 int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
153 {
154 	struct sock *sk;
155 	struct hlist_head *head;
156 	int delivered = 0;
157 
158 	read_lock(&raw_v4_lock);
159 	head = &raw_v4_htable[hash];
160 	if (hlist_empty(head))
161 		goto out;
162 	sk = __raw_v4_lookup(__sk_head(head), iph->protocol,
163 			     iph->saddr, iph->daddr,
164 			     skb->dev->ifindex);
165 
166 	while (sk) {
167 		delivered = 1;
168 		if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
169 			struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
170 
171 			/* Not releasing hash table! */
172 			if (clone)
173 				raw_rcv(sk, clone);
174 		}
175 		sk = __raw_v4_lookup(sk_next(sk), iph->protocol,
176 				     iph->saddr, iph->daddr,
177 				     skb->dev->ifindex);
178 	}
179 out:
180 	read_unlock(&raw_v4_lock);
181 	return delivered;
182 }
183 
184 void raw_err (struct sock *sk, struct sk_buff *skb, u32 info)
185 {
186 	struct inet_sock *inet = inet_sk(sk);
187 	const int type = icmp_hdr(skb)->type;
188 	const int code = icmp_hdr(skb)->code;
189 	int err = 0;
190 	int harderr = 0;
191 
192 	/* Report error on raw socket, if:
193 	   1. User requested ip_recverr.
194 	   2. Socket is connected (otherwise the error indication
195 	      is useless without ip_recverr and error is hard.
196 	 */
197 	if (!inet->recverr && sk->sk_state != TCP_ESTABLISHED)
198 		return;
199 
200 	switch (type) {
201 	default:
202 	case ICMP_TIME_EXCEEDED:
203 		err = EHOSTUNREACH;
204 		break;
205 	case ICMP_SOURCE_QUENCH:
206 		return;
207 	case ICMP_PARAMETERPROB:
208 		err = EPROTO;
209 		harderr = 1;
210 		break;
211 	case ICMP_DEST_UNREACH:
212 		err = EHOSTUNREACH;
213 		if (code > NR_ICMP_UNREACH)
214 			break;
215 		err = icmp_err_convert[code].errno;
216 		harderr = icmp_err_convert[code].fatal;
217 		if (code == ICMP_FRAG_NEEDED) {
218 			harderr = inet->pmtudisc != IP_PMTUDISC_DONT;
219 			err = EMSGSIZE;
220 		}
221 	}
222 
223 	if (inet->recverr) {
224 		struct iphdr *iph = (struct iphdr*)skb->data;
225 		u8 *payload = skb->data + (iph->ihl << 2);
226 
227 		if (inet->hdrincl)
228 			payload = skb->data;
229 		ip_icmp_error(sk, skb, err, 0, info, payload);
230 	}
231 
232 	if (inet->recverr || harderr) {
233 		sk->sk_err = err;
234 		sk->sk_error_report(sk);
235 	}
236 }
237 
238 static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
239 {
240 	/* Charge it to the socket. */
241 
242 	if (sock_queue_rcv_skb(sk, skb) < 0) {
243 		/* FIXME: increment a raw drops counter here */
244 		kfree_skb(skb);
245 		return NET_RX_DROP;
246 	}
247 
248 	return NET_RX_SUCCESS;
249 }
250 
251 int raw_rcv(struct sock *sk, struct sk_buff *skb)
252 {
253 	if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) {
254 		kfree_skb(skb);
255 		return NET_RX_DROP;
256 	}
257 	nf_reset(skb);
258 
259 	skb_push(skb, skb->data - skb_network_header(skb));
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_reset_network_header(skb);
295 	iph = ip_hdr(skb);
296 	skb_put(skb, length);
297 
298 	skb->ip_summed = CHECKSUM_NONE;
299 
300 	skb->transport_header = skb->network_header;
301 	err = memcpy_fromiovecend((void *)iph, from, 0, length);
302 	if (err)
303 		goto error_fault;
304 
305 	/* We don't modify invalid header */
306 	if (length >= sizeof(*iph) && iph->ihl * 4U <= length) {
307 		if (!iph->saddr)
308 			iph->saddr = rt->rt_src;
309 		iph->check   = 0;
310 		iph->tot_len = htons(length);
311 		if (!iph->id)
312 			ip_select_ident(iph, &rt->u.dst, NULL);
313 
314 		iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
315 	}
316 
317 	err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
318 		      dst_output);
319 	if (err > 0)
320 		err = inet->recverr ? net_xmit_errno(err) : 0;
321 	if (err)
322 		goto error;
323 out:
324 	return 0;
325 
326 error_fault:
327 	err = -EFAULT;
328 	kfree_skb(skb);
329 error:
330 	IP_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
331 	return err;
332 }
333 
334 static int raw_probe_proto_opt(struct flowi *fl, struct msghdr *msg)
335 {
336 	struct iovec *iov;
337 	u8 __user *type = NULL;
338 	u8 __user *code = NULL;
339 	int probed = 0;
340 	unsigned int i;
341 
342 	if (!msg->msg_iov)
343 		return 0;
344 
345 	for (i = 0; i < msg->msg_iovlen; i++) {
346 		iov = &msg->msg_iov[i];
347 		if (!iov)
348 			continue;
349 
350 		switch (fl->proto) {
351 		case IPPROTO_ICMP:
352 			/* check if one-byte field is readable or not. */
353 			if (iov->iov_base && iov->iov_len < 1)
354 				break;
355 
356 			if (!type) {
357 				type = iov->iov_base;
358 				/* check if code field is readable or not. */
359 				if (iov->iov_len > 1)
360 					code = type + 1;
361 			} else if (!code)
362 				code = iov->iov_base;
363 
364 			if (type && code) {
365 				if (get_user(fl->fl_icmp_type, type) ||
366 				    get_user(fl->fl_icmp_code, code))
367 					return -EFAULT;
368 				probed = 1;
369 			}
370 			break;
371 		default:
372 			probed = 1;
373 			break;
374 		}
375 		if (probed)
376 			break;
377 	}
378 	return 0;
379 }
380 
381 static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
382 		       size_t len)
383 {
384 	struct inet_sock *inet = inet_sk(sk);
385 	struct ipcm_cookie ipc;
386 	struct rtable *rt = NULL;
387 	int free = 0;
388 	__be32 daddr;
389 	__be32 saddr;
390 	u8  tos;
391 	int err;
392 
393 	err = -EMSGSIZE;
394 	if (len > 0xFFFF)
395 		goto out;
396 
397 	/*
398 	 *	Check the flags.
399 	 */
400 
401 	err = -EOPNOTSUPP;
402 	if (msg->msg_flags & MSG_OOB)	/* Mirror BSD error message */
403 		goto out;               /* compatibility */
404 
405 	/*
406 	 *	Get and verify the address.
407 	 */
408 
409 	if (msg->msg_namelen) {
410 		struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name;
411 		err = -EINVAL;
412 		if (msg->msg_namelen < sizeof(*usin))
413 			goto out;
414 		if (usin->sin_family != AF_INET) {
415 			static int complained;
416 			if (!complained++)
417 				printk(KERN_INFO "%s forgot to set AF_INET in "
418 						 "raw sendmsg. Fix it!\n",
419 						 current->comm);
420 			err = -EAFNOSUPPORT;
421 			if (usin->sin_family)
422 				goto out;
423 		}
424 		daddr = usin->sin_addr.s_addr;
425 		/* ANK: I did not forget to get protocol from port field.
426 		 * I just do not know, who uses this weirdness.
427 		 * IP_HDRINCL is much more convenient.
428 		 */
429 	} else {
430 		err = -EDESTADDRREQ;
431 		if (sk->sk_state != TCP_ESTABLISHED)
432 			goto out;
433 		daddr = inet->daddr;
434 	}
435 
436 	ipc.addr = inet->saddr;
437 	ipc.opt = NULL;
438 	ipc.oif = sk->sk_bound_dev_if;
439 
440 	if (msg->msg_controllen) {
441 		err = ip_cmsg_send(msg, &ipc);
442 		if (err)
443 			goto out;
444 		if (ipc.opt)
445 			free = 1;
446 	}
447 
448 	saddr = ipc.addr;
449 	ipc.addr = daddr;
450 
451 	if (!ipc.opt)
452 		ipc.opt = inet->opt;
453 
454 	if (ipc.opt) {
455 		err = -EINVAL;
456 		/* Linux does not mangle headers on raw sockets,
457 		 * so that IP options + IP_HDRINCL is non-sense.
458 		 */
459 		if (inet->hdrincl)
460 			goto done;
461 		if (ipc.opt->srr) {
462 			if (!daddr)
463 				goto done;
464 			daddr = ipc.opt->faddr;
465 		}
466 	}
467 	tos = RT_CONN_FLAGS(sk);
468 	if (msg->msg_flags & MSG_DONTROUTE)
469 		tos |= RTO_ONLINK;
470 
471 	if (MULTICAST(daddr)) {
472 		if (!ipc.oif)
473 			ipc.oif = inet->mc_index;
474 		if (!saddr)
475 			saddr = inet->mc_addr;
476 	}
477 
478 	{
479 		struct flowi fl = { .oif = ipc.oif,
480 				    .nl_u = { .ip4_u =
481 					      { .daddr = daddr,
482 						.saddr = saddr,
483 						.tos = tos } },
484 				    .proto = inet->hdrincl ? IPPROTO_RAW :
485 							     sk->sk_protocol,
486 				  };
487 		if (!inet->hdrincl) {
488 			err = raw_probe_proto_opt(&fl, msg);
489 			if (err)
490 				goto done;
491 		}
492 
493 		security_sk_classify_flow(sk, &fl);
494 		err = ip_route_output_flow(&rt, &fl, sk, 1);
495 	}
496 	if (err)
497 		goto done;
498 
499 	err = -EACCES;
500 	if (rt->rt_flags & RTCF_BROADCAST && !sock_flag(sk, SOCK_BROADCAST))
501 		goto done;
502 
503 	if (msg->msg_flags & MSG_CONFIRM)
504 		goto do_confirm;
505 back_from_confirm:
506 
507 	if (inet->hdrincl)
508 		err = raw_send_hdrinc(sk, msg->msg_iov, len,
509 					rt, msg->msg_flags);
510 
511 	 else {
512 		if (!ipc.addr)
513 			ipc.addr = rt->rt_dst;
514 		lock_sock(sk);
515 		err = ip_append_data(sk, ip_generic_getfrag, msg->msg_iov, len, 0,
516 					&ipc, rt, msg->msg_flags);
517 		if (err)
518 			ip_flush_pending_frames(sk);
519 		else if (!(msg->msg_flags & MSG_MORE))
520 			err = ip_push_pending_frames(sk);
521 		release_sock(sk);
522 	}
523 done:
524 	if (free)
525 		kfree(ipc.opt);
526 	ip_rt_put(rt);
527 
528 out:
529 	if (err < 0)
530 		return err;
531 	return len;
532 
533 do_confirm:
534 	dst_confirm(&rt->u.dst);
535 	if (!(msg->msg_flags & MSG_PROBE) || len)
536 		goto back_from_confirm;
537 	err = 0;
538 	goto done;
539 }
540 
541 static void raw_close(struct sock *sk, long timeout)
542 {
543 	/*
544 	 * Raw sockets may have direct kernel refereneces. Kill them.
545 	 */
546 	ip_ra_control(sk, 0, NULL);
547 
548 	sk_common_release(sk);
549 }
550 
551 /* This gets rid of all the nasties in af_inet. -DaveM */
552 static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
553 {
554 	struct inet_sock *inet = inet_sk(sk);
555 	struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
556 	int ret = -EINVAL;
557 	int chk_addr_ret;
558 
559 	if (sk->sk_state != TCP_CLOSE || addr_len < sizeof(struct sockaddr_in))
560 		goto out;
561 	chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
562 	ret = -EADDRNOTAVAIL;
563 	if (addr->sin_addr.s_addr && chk_addr_ret != RTN_LOCAL &&
564 	    chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST)
565 		goto out;
566 	inet->rcv_saddr = inet->saddr = addr->sin_addr.s_addr;
567 	if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
568 		inet->saddr = 0;  /* Use device */
569 	sk_dst_reset(sk);
570 	ret = 0;
571 out:	return ret;
572 }
573 
574 /*
575  *	This should be easy, if there is something there
576  *	we return it, otherwise we block.
577  */
578 
579 static int raw_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
580 		       size_t len, int noblock, int flags, int *addr_len)
581 {
582 	struct inet_sock *inet = inet_sk(sk);
583 	size_t copied = 0;
584 	int err = -EOPNOTSUPP;
585 	struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
586 	struct sk_buff *skb;
587 
588 	if (flags & MSG_OOB)
589 		goto out;
590 
591 	if (addr_len)
592 		*addr_len = sizeof(*sin);
593 
594 	if (flags & MSG_ERRQUEUE) {
595 		err = ip_recv_error(sk, msg, len);
596 		goto out;
597 	}
598 
599 	skb = skb_recv_datagram(sk, flags, noblock, &err);
600 	if (!skb)
601 		goto out;
602 
603 	copied = skb->len;
604 	if (len < copied) {
605 		msg->msg_flags |= MSG_TRUNC;
606 		copied = len;
607 	}
608 
609 	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
610 	if (err)
611 		goto done;
612 
613 	sock_recv_timestamp(msg, sk, skb);
614 
615 	/* Copy the address. */
616 	if (sin) {
617 		sin->sin_family = AF_INET;
618 		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
619 		sin->sin_port = 0;
620 		memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
621 	}
622 	if (inet->cmsg_flags)
623 		ip_cmsg_recv(msg, skb);
624 	if (flags & MSG_TRUNC)
625 		copied = skb->len;
626 done:
627 	skb_free_datagram(sk, skb);
628 out:
629 	if (err)
630 		return err;
631 	return copied;
632 }
633 
634 static int raw_init(struct sock *sk)
635 {
636 	struct raw_sock *rp = raw_sk(sk);
637 
638 	if (inet_sk(sk)->num == IPPROTO_ICMP)
639 		memset(&rp->filter, 0, sizeof(rp->filter));
640 	return 0;
641 }
642 
643 static int raw_seticmpfilter(struct sock *sk, char __user *optval, int optlen)
644 {
645 	if (optlen > sizeof(struct icmp_filter))
646 		optlen = sizeof(struct icmp_filter);
647 	if (copy_from_user(&raw_sk(sk)->filter, optval, optlen))
648 		return -EFAULT;
649 	return 0;
650 }
651 
652 static int raw_geticmpfilter(struct sock *sk, char __user *optval, int __user *optlen)
653 {
654 	int len, ret = -EFAULT;
655 
656 	if (get_user(len, optlen))
657 		goto out;
658 	ret = -EINVAL;
659 	if (len < 0)
660 		goto out;
661 	if (len > sizeof(struct icmp_filter))
662 		len = sizeof(struct icmp_filter);
663 	ret = -EFAULT;
664 	if (put_user(len, optlen) ||
665 	    copy_to_user(optval, &raw_sk(sk)->filter, len))
666 		goto out;
667 	ret = 0;
668 out:	return ret;
669 }
670 
671 static int do_raw_setsockopt(struct sock *sk, int level, int optname,
672 			  char __user *optval, int optlen)
673 {
674 	if (optname == ICMP_FILTER) {
675 		if (inet_sk(sk)->num != IPPROTO_ICMP)
676 			return -EOPNOTSUPP;
677 		else
678 			return raw_seticmpfilter(sk, optval, optlen);
679 	}
680 	return -ENOPROTOOPT;
681 }
682 
683 static int raw_setsockopt(struct sock *sk, int level, int optname,
684 			  char __user *optval, int optlen)
685 {
686 	if (level != SOL_RAW)
687 		return ip_setsockopt(sk, level, optname, optval, optlen);
688 	return do_raw_setsockopt(sk, level, optname, optval, optlen);
689 }
690 
691 #ifdef CONFIG_COMPAT
692 static int compat_raw_setsockopt(struct sock *sk, int level, int optname,
693 				 char __user *optval, int optlen)
694 {
695 	if (level != SOL_RAW)
696 		return compat_ip_setsockopt(sk, level, optname, optval, optlen);
697 	return do_raw_setsockopt(sk, level, optname, optval, optlen);
698 }
699 #endif
700 
701 static int do_raw_getsockopt(struct sock *sk, int level, int optname,
702 			  char __user *optval, int __user *optlen)
703 {
704 	if (optname == ICMP_FILTER) {
705 		if (inet_sk(sk)->num != IPPROTO_ICMP)
706 			return -EOPNOTSUPP;
707 		else
708 			return raw_geticmpfilter(sk, optval, optlen);
709 	}
710 	return -ENOPROTOOPT;
711 }
712 
713 static int raw_getsockopt(struct sock *sk, int level, int optname,
714 			  char __user *optval, int __user *optlen)
715 {
716 	if (level != SOL_RAW)
717 		return ip_getsockopt(sk, level, optname, optval, optlen);
718 	return do_raw_getsockopt(sk, level, optname, optval, optlen);
719 }
720 
721 #ifdef CONFIG_COMPAT
722 static int compat_raw_getsockopt(struct sock *sk, int level, int optname,
723 				 char __user *optval, int __user *optlen)
724 {
725 	if (level != SOL_RAW)
726 		return compat_ip_getsockopt(sk, level, optname, optval, optlen);
727 	return do_raw_getsockopt(sk, level, optname, optval, optlen);
728 }
729 #endif
730 
731 static int raw_ioctl(struct sock *sk, int cmd, unsigned long arg)
732 {
733 	switch (cmd) {
734 		case SIOCOUTQ: {
735 			int amount = atomic_read(&sk->sk_wmem_alloc);
736 			return put_user(amount, (int __user *)arg);
737 		}
738 		case SIOCINQ: {
739 			struct sk_buff *skb;
740 			int amount = 0;
741 
742 			spin_lock_bh(&sk->sk_receive_queue.lock);
743 			skb = skb_peek(&sk->sk_receive_queue);
744 			if (skb != NULL)
745 				amount = skb->len;
746 			spin_unlock_bh(&sk->sk_receive_queue.lock);
747 			return put_user(amount, (int __user *)arg);
748 		}
749 
750 		default:
751 #ifdef CONFIG_IP_MROUTE
752 			return ipmr_ioctl(sk, cmd, (void __user *)arg);
753 #else
754 			return -ENOIOCTLCMD;
755 #endif
756 	}
757 }
758 
759 struct proto raw_prot = {
760 	.name		   = "RAW",
761 	.owner		   = THIS_MODULE,
762 	.close		   = raw_close,
763 	.connect	   = ip4_datagram_connect,
764 	.disconnect	   = udp_disconnect,
765 	.ioctl		   = raw_ioctl,
766 	.init		   = raw_init,
767 	.setsockopt	   = raw_setsockopt,
768 	.getsockopt	   = raw_getsockopt,
769 	.sendmsg	   = raw_sendmsg,
770 	.recvmsg	   = raw_recvmsg,
771 	.bind		   = raw_bind,
772 	.backlog_rcv	   = raw_rcv_skb,
773 	.hash		   = raw_v4_hash,
774 	.unhash		   = raw_v4_unhash,
775 	.obj_size	   = sizeof(struct raw_sock),
776 #ifdef CONFIG_COMPAT
777 	.compat_setsockopt = compat_raw_setsockopt,
778 	.compat_getsockopt = compat_raw_getsockopt,
779 #endif
780 };
781 
782 #ifdef CONFIG_PROC_FS
783 struct raw_iter_state {
784 	int bucket;
785 };
786 
787 #define raw_seq_private(seq) ((struct raw_iter_state *)(seq)->private)
788 
789 static struct sock *raw_get_first(struct seq_file *seq)
790 {
791 	struct sock *sk;
792 	struct raw_iter_state* state = raw_seq_private(seq);
793 
794 	for (state->bucket = 0; state->bucket < RAWV4_HTABLE_SIZE; ++state->bucket) {
795 		struct hlist_node *node;
796 
797 		sk_for_each(sk, node, &raw_v4_htable[state->bucket])
798 			if (sk->sk_family == PF_INET)
799 				goto found;
800 	}
801 	sk = NULL;
802 found:
803 	return sk;
804 }
805 
806 static struct sock *raw_get_next(struct seq_file *seq, struct sock *sk)
807 {
808 	struct raw_iter_state* state = raw_seq_private(seq);
809 
810 	do {
811 		sk = sk_next(sk);
812 try_again:
813 		;
814 	} while (sk && sk->sk_family != PF_INET);
815 
816 	if (!sk && ++state->bucket < RAWV4_HTABLE_SIZE) {
817 		sk = sk_head(&raw_v4_htable[state->bucket]);
818 		goto try_again;
819 	}
820 	return sk;
821 }
822 
823 static struct sock *raw_get_idx(struct seq_file *seq, loff_t pos)
824 {
825 	struct sock *sk = raw_get_first(seq);
826 
827 	if (sk)
828 		while (pos && (sk = raw_get_next(seq, sk)) != NULL)
829 			--pos;
830 	return pos ? NULL : sk;
831 }
832 
833 static void *raw_seq_start(struct seq_file *seq, loff_t *pos)
834 {
835 	read_lock(&raw_v4_lock);
836 	return *pos ? raw_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
837 }
838 
839 static void *raw_seq_next(struct seq_file *seq, void *v, loff_t *pos)
840 {
841 	struct sock *sk;
842 
843 	if (v == SEQ_START_TOKEN)
844 		sk = raw_get_first(seq);
845 	else
846 		sk = raw_get_next(seq, v);
847 	++*pos;
848 	return sk;
849 }
850 
851 static void raw_seq_stop(struct seq_file *seq, void *v)
852 {
853 	read_unlock(&raw_v4_lock);
854 }
855 
856 static __inline__ char *get_raw_sock(struct sock *sp, char *tmpbuf, int i)
857 {
858 	struct inet_sock *inet = inet_sk(sp);
859 	__be32 dest = inet->daddr,
860 	       src = inet->rcv_saddr;
861 	__u16 destp = 0,
862 	      srcp  = inet->num;
863 
864 	sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
865 		" %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
866 		i, src, srcp, dest, destp, sp->sk_state,
867 		atomic_read(&sp->sk_wmem_alloc),
868 		atomic_read(&sp->sk_rmem_alloc),
869 		0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
870 		atomic_read(&sp->sk_refcnt), sp);
871 	return tmpbuf;
872 }
873 
874 static int raw_seq_show(struct seq_file *seq, void *v)
875 {
876 	char tmpbuf[129];
877 
878 	if (v == SEQ_START_TOKEN)
879 		seq_printf(seq, "%-127s\n",
880 			       "  sl  local_address rem_address   st tx_queue "
881 			       "rx_queue tr tm->when retrnsmt   uid  timeout "
882 			       "inode");
883 	else {
884 		struct raw_iter_state *state = raw_seq_private(seq);
885 
886 		seq_printf(seq, "%-127s\n",
887 			   get_raw_sock(v, tmpbuf, state->bucket));
888 	}
889 	return 0;
890 }
891 
892 static const struct seq_operations raw_seq_ops = {
893 	.start = raw_seq_start,
894 	.next  = raw_seq_next,
895 	.stop  = raw_seq_stop,
896 	.show  = raw_seq_show,
897 };
898 
899 static int raw_seq_open(struct inode *inode, struct file *file)
900 {
901 	struct seq_file *seq;
902 	int rc = -ENOMEM;
903 	struct raw_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
904 
905 	if (!s)
906 		goto out;
907 	rc = seq_open(file, &raw_seq_ops);
908 	if (rc)
909 		goto out_kfree;
910 
911 	seq = file->private_data;
912 	seq->private = s;
913 	memset(s, 0, sizeof(*s));
914 out:
915 	return rc;
916 out_kfree:
917 	kfree(s);
918 	goto out;
919 }
920 
921 static const struct file_operations raw_seq_fops = {
922 	.owner	 = THIS_MODULE,
923 	.open	 = raw_seq_open,
924 	.read	 = seq_read,
925 	.llseek	 = seq_lseek,
926 	.release = seq_release_private,
927 };
928 
929 int __init raw_proc_init(void)
930 {
931 	if (!proc_net_fops_create("raw", S_IRUGO, &raw_seq_fops))
932 		return -ENOMEM;
933 	return 0;
934 }
935 
936 void __init raw_proc_exit(void)
937 {
938 	proc_net_remove("raw");
939 }
940 #endif /* CONFIG_PROC_FS */
941