xref: /openbmc/linux/net/ipv4/igmp.c (revision 643d1f7f)
1 /*
2  *	Linux NET3:	Internet Group Management Protocol  [IGMP]
3  *
4  *	This code implements the IGMP protocol as defined in RFC1112. There has
5  *	been a further revision of this protocol since which is now supported.
6  *
7  *	If you have trouble with this module be careful what gcc you have used,
8  *	the older version didn't come out right using gcc 2.5.8, the newer one
9  *	seems to fall out with gcc 2.6.2.
10  *
11  *	Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
12  *
13  *	Authors:
14  *		Alan Cox <Alan.Cox@linux.org>
15  *
16  *	This program is free software; you can redistribute it and/or
17  *	modify it under the terms of the GNU General Public License
18  *	as published by the Free Software Foundation; either version
19  *	2 of the License, or (at your option) any later version.
20  *
21  *	Fixes:
22  *
23  *		Alan Cox	:	Added lots of __inline__ to optimise
24  *					the memory usage of all the tiny little
25  *					functions.
26  *		Alan Cox	:	Dumped the header building experiment.
27  *		Alan Cox	:	Minor tweaks ready for multicast routing
28  *					and extended IGMP protocol.
29  *		Alan Cox	:	Removed a load of inline directives. Gcc 2.5.8
30  *					writes utterly bogus code otherwise (sigh)
31  *					fixed IGMP loopback to behave in the manner
32  *					desired by mrouted, fixed the fact it has been
33  *					broken since 1.3.6 and cleaned up a few minor
34  *					points.
35  *
36  *		Chih-Jen Chang	:	Tried to revise IGMP to Version 2
37  *		Tsu-Sheng Tsao		E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
38  *					The enhancements are mainly based on Steve Deering's
39  * 					ipmulti-3.5 source code.
40  *		Chih-Jen Chang	:	Added the igmp_get_mrouter_info and
41  *		Tsu-Sheng Tsao		igmp_set_mrouter_info to keep track of
42  *					the mrouted version on that device.
43  *		Chih-Jen Chang	:	Added the max_resp_time parameter to
44  *		Tsu-Sheng Tsao		igmp_heard_query(). Using this parameter
45  *					to identify the multicast router version
46  *					and do what the IGMP version 2 specified.
47  *		Chih-Jen Chang	:	Added a timer to revert to IGMP V2 router
48  *		Tsu-Sheng Tsao		if the specified time expired.
49  *		Alan Cox	:	Stop IGMP from 0.0.0.0 being accepted.
50  *		Alan Cox	:	Use GFP_ATOMIC in the right places.
51  *		Christian Daudt :	igmp timer wasn't set for local group
52  *					memberships but was being deleted,
53  *					which caused a "del_timer() called
54  *					from %p with timer not initialized\n"
55  *					message (960131).
56  *		Christian Daudt :	removed del_timer from
57  *					igmp_timer_expire function (960205).
58  *             Christian Daudt :       igmp_heard_report now only calls
59  *                                     igmp_timer_expire if tm->running is
60  *                                     true (960216).
61  *		Malcolm Beattie :	ttl comparison wrong in igmp_rcv made
62  *					igmp_heard_query never trigger. Expiry
63  *					miscalculation fixed in igmp_heard_query
64  *					and random() made to return unsigned to
65  *					prevent negative expiry times.
66  *		Alexey Kuznetsov:	Wrong group leaving behaviour, backport
67  *					fix from pending 2.1.x patches.
68  *		Alan Cox:		Forget to enable FDDI support earlier.
69  *		Alexey Kuznetsov:	Fixed leaving groups on device down.
70  *		Alexey Kuznetsov:	Accordance to igmp-v2-06 draft.
71  *		David L Stevens:	IGMPv3 support, with help from
72  *					Vinay Kulkarni
73  */
74 
75 #include <linux/module.h>
76 #include <asm/uaccess.h>
77 #include <asm/system.h>
78 #include <linux/types.h>
79 #include <linux/kernel.h>
80 #include <linux/jiffies.h>
81 #include <linux/string.h>
82 #include <linux/socket.h>
83 #include <linux/sockios.h>
84 #include <linux/in.h>
85 #include <linux/inet.h>
86 #include <linux/netdevice.h>
87 #include <linux/skbuff.h>
88 #include <linux/inetdevice.h>
89 #include <linux/igmp.h>
90 #include <linux/if_arp.h>
91 #include <linux/rtnetlink.h>
92 #include <linux/times.h>
93 
94 #include <net/net_namespace.h>
95 #include <net/arp.h>
96 #include <net/ip.h>
97 #include <net/protocol.h>
98 #include <net/route.h>
99 #include <net/sock.h>
100 #include <net/checksum.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
104 #endif
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
108 #endif
109 
110 #define IP_MAX_MEMBERSHIPS	20
111 #define IP_MAX_MSF		10
112 
113 #ifdef CONFIG_IP_MULTICAST
114 /* Parameter names and values are taken from igmp-v2-06 draft */
115 
116 #define IGMP_V1_Router_Present_Timeout		(400*HZ)
117 #define IGMP_V2_Router_Present_Timeout		(400*HZ)
118 #define IGMP_Unsolicited_Report_Interval	(10*HZ)
119 #define IGMP_Query_Response_Interval		(10*HZ)
120 #define IGMP_Unsolicited_Report_Count		2
121 
122 
123 #define IGMP_Initial_Report_Delay		(1)
124 
125 /* IGMP_Initial_Report_Delay is not from IGMP specs!
126  * IGMP specs require to report membership immediately after
127  * joining a group, but we delay the first report by a
128  * small interval. It seems more natural and still does not
129  * contradict to specs provided this delay is small enough.
130  */
131 
132 #define IGMP_V1_SEEN(in_dev) \
133 	(IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 1 || \
134 	 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
135 	 ((in_dev)->mr_v1_seen && \
136 	  time_before(jiffies, (in_dev)->mr_v1_seen)))
137 #define IGMP_V2_SEEN(in_dev) \
138 	(IPV4_DEVCONF_ALL(in_dev->dev->nd_net, FORCE_IGMP_VERSION) == 2 || \
139 	 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
140 	 ((in_dev)->mr_v2_seen && \
141 	  time_before(jiffies, (in_dev)->mr_v2_seen)))
142 
143 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
144 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
145 static void igmpv3_clear_delrec(struct in_device *in_dev);
146 static int sf_setstate(struct ip_mc_list *pmc);
147 static void sf_markstate(struct ip_mc_list *pmc);
148 #endif
149 static void ip_mc_clear_src(struct ip_mc_list *pmc);
150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
151 			 int sfcount, __be32 *psfsrc, int delta);
152 
153 static void ip_ma_put(struct ip_mc_list *im)
154 {
155 	if (atomic_dec_and_test(&im->refcnt)) {
156 		in_dev_put(im->interface);
157 		kfree(im);
158 	}
159 }
160 
161 #ifdef CONFIG_IP_MULTICAST
162 
163 /*
164  *	Timer management
165  */
166 
167 static __inline__ void igmp_stop_timer(struct ip_mc_list *im)
168 {
169 	spin_lock_bh(&im->lock);
170 	if (del_timer(&im->timer))
171 		atomic_dec(&im->refcnt);
172 	im->tm_running=0;
173 	im->reporter = 0;
174 	im->unsolicit_count = 0;
175 	spin_unlock_bh(&im->lock);
176 }
177 
178 /* It must be called with locked im->lock */
179 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
180 {
181 	int tv=net_random() % max_delay;
182 
183 	im->tm_running=1;
184 	if (!mod_timer(&im->timer, jiffies+tv+2))
185 		atomic_inc(&im->refcnt);
186 }
187 
188 static void igmp_gq_start_timer(struct in_device *in_dev)
189 {
190 	int tv = net_random() % in_dev->mr_maxdelay;
191 
192 	in_dev->mr_gq_running = 1;
193 	if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
194 		in_dev_hold(in_dev);
195 }
196 
197 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
198 {
199 	int tv = net_random() % delay;
200 
201 	if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
202 		in_dev_hold(in_dev);
203 }
204 
205 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
206 {
207 	spin_lock_bh(&im->lock);
208 	im->unsolicit_count = 0;
209 	if (del_timer(&im->timer)) {
210 		if ((long)(im->timer.expires-jiffies) < max_delay) {
211 			add_timer(&im->timer);
212 			im->tm_running=1;
213 			spin_unlock_bh(&im->lock);
214 			return;
215 		}
216 		atomic_dec(&im->refcnt);
217 	}
218 	igmp_start_timer(im, max_delay);
219 	spin_unlock_bh(&im->lock);
220 }
221 
222 
223 /*
224  *	Send an IGMP report.
225  */
226 
227 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
228 
229 
230 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
231 	int gdeleted, int sdeleted)
232 {
233 	switch (type) {
234 	case IGMPV3_MODE_IS_INCLUDE:
235 	case IGMPV3_MODE_IS_EXCLUDE:
236 		if (gdeleted || sdeleted)
237 			return 0;
238 		if (!(pmc->gsquery && !psf->sf_gsresp)) {
239 			if (pmc->sfmode == MCAST_INCLUDE)
240 				return 1;
241 			/* don't include if this source is excluded
242 			 * in all filters
243 			 */
244 			if (psf->sf_count[MCAST_INCLUDE])
245 				return type == IGMPV3_MODE_IS_INCLUDE;
246 			return pmc->sfcount[MCAST_EXCLUDE] ==
247 				psf->sf_count[MCAST_EXCLUDE];
248 		}
249 		return 0;
250 	case IGMPV3_CHANGE_TO_INCLUDE:
251 		if (gdeleted || sdeleted)
252 			return 0;
253 		return psf->sf_count[MCAST_INCLUDE] != 0;
254 	case IGMPV3_CHANGE_TO_EXCLUDE:
255 		if (gdeleted || sdeleted)
256 			return 0;
257 		if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
258 		    psf->sf_count[MCAST_INCLUDE])
259 			return 0;
260 		return pmc->sfcount[MCAST_EXCLUDE] ==
261 			psf->sf_count[MCAST_EXCLUDE];
262 	case IGMPV3_ALLOW_NEW_SOURCES:
263 		if (gdeleted || !psf->sf_crcount)
264 			return 0;
265 		return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
266 	case IGMPV3_BLOCK_OLD_SOURCES:
267 		if (pmc->sfmode == MCAST_INCLUDE)
268 			return gdeleted || (psf->sf_crcount && sdeleted);
269 		return psf->sf_crcount && !gdeleted && !sdeleted;
270 	}
271 	return 0;
272 }
273 
274 static int
275 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
276 {
277 	struct ip_sf_list *psf;
278 	int scount = 0;
279 
280 	for (psf=pmc->sources; psf; psf=psf->sf_next) {
281 		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
282 			continue;
283 		scount++;
284 	}
285 	return scount;
286 }
287 
288 static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
289 {
290 	struct sk_buff *skb;
291 	struct rtable *rt;
292 	struct iphdr *pip;
293 	struct igmpv3_report *pig;
294 
295 	skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC);
296 	if (skb == NULL)
297 		return NULL;
298 
299 	{
300 		struct flowi fl = { .oif = dev->ifindex,
301 				    .nl_u = { .ip4_u = {
302 				    .daddr = IGMPV3_ALL_MCR } },
303 				    .proto = IPPROTO_IGMP };
304 		if (ip_route_output_key(&init_net, &rt, &fl)) {
305 			kfree_skb(skb);
306 			return NULL;
307 		}
308 	}
309 	if (rt->rt_src == 0) {
310 		kfree_skb(skb);
311 		ip_rt_put(rt);
312 		return NULL;
313 	}
314 
315 	skb->dst = &rt->u.dst;
316 	skb->dev = dev;
317 
318 	skb_reserve(skb, LL_RESERVED_SPACE(dev));
319 
320 	skb_reset_network_header(skb);
321 	pip = ip_hdr(skb);
322 	skb_put(skb, sizeof(struct iphdr) + 4);
323 
324 	pip->version  = 4;
325 	pip->ihl      = (sizeof(struct iphdr)+4)>>2;
326 	pip->tos      = 0xc0;
327 	pip->frag_off = htons(IP_DF);
328 	pip->ttl      = 1;
329 	pip->daddr    = rt->rt_dst;
330 	pip->saddr    = rt->rt_src;
331 	pip->protocol = IPPROTO_IGMP;
332 	pip->tot_len  = 0;	/* filled in later */
333 	ip_select_ident(pip, &rt->u.dst, NULL);
334 	((u8*)&pip[1])[0] = IPOPT_RA;
335 	((u8*)&pip[1])[1] = 4;
336 	((u8*)&pip[1])[2] = 0;
337 	((u8*)&pip[1])[3] = 0;
338 
339 	skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
340 	skb_put(skb, sizeof(*pig));
341 	pig = igmpv3_report_hdr(skb);
342 	pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
343 	pig->resv1 = 0;
344 	pig->csum = 0;
345 	pig->resv2 = 0;
346 	pig->ngrec = 0;
347 	return skb;
348 }
349 
350 static int igmpv3_sendpack(struct sk_buff *skb)
351 {
352 	struct igmphdr *pig = igmp_hdr(skb);
353 	const int igmplen = skb->tail - skb->transport_header;
354 
355 	pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
356 
357 	return ip_local_out(skb);
358 }
359 
360 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
361 {
362 	return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel);
363 }
364 
365 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
366 	int type, struct igmpv3_grec **ppgr)
367 {
368 	struct net_device *dev = pmc->interface->dev;
369 	struct igmpv3_report *pih;
370 	struct igmpv3_grec *pgr;
371 
372 	if (!skb)
373 		skb = igmpv3_newpack(dev, dev->mtu);
374 	if (!skb)
375 		return NULL;
376 	pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
377 	pgr->grec_type = type;
378 	pgr->grec_auxwords = 0;
379 	pgr->grec_nsrcs = 0;
380 	pgr->grec_mca = pmc->multiaddr;
381 	pih = igmpv3_report_hdr(skb);
382 	pih->ngrec = htons(ntohs(pih->ngrec)+1);
383 	*ppgr = pgr;
384 	return skb;
385 }
386 
387 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
388 	skb_tailroom(skb)) : 0)
389 
390 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
391 	int type, int gdeleted, int sdeleted)
392 {
393 	struct net_device *dev = pmc->interface->dev;
394 	struct igmpv3_report *pih;
395 	struct igmpv3_grec *pgr = NULL;
396 	struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
397 	int scount, stotal, first, isquery, truncate;
398 
399 	if (pmc->multiaddr == IGMP_ALL_HOSTS)
400 		return skb;
401 
402 	isquery = type == IGMPV3_MODE_IS_INCLUDE ||
403 		  type == IGMPV3_MODE_IS_EXCLUDE;
404 	truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
405 		    type == IGMPV3_CHANGE_TO_EXCLUDE;
406 
407 	stotal = scount = 0;
408 
409 	psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
410 
411 	if (!*psf_list)
412 		goto empty_source;
413 
414 	pih = skb ? igmpv3_report_hdr(skb) : NULL;
415 
416 	/* EX and TO_EX get a fresh packet, if needed */
417 	if (truncate) {
418 		if (pih && pih->ngrec &&
419 		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
420 			if (skb)
421 				igmpv3_sendpack(skb);
422 			skb = igmpv3_newpack(dev, dev->mtu);
423 		}
424 	}
425 	first = 1;
426 	psf_prev = NULL;
427 	for (psf=*psf_list; psf; psf=psf_next) {
428 		__be32 *psrc;
429 
430 		psf_next = psf->sf_next;
431 
432 		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
433 			psf_prev = psf;
434 			continue;
435 		}
436 
437 		/* clear marks on query responses */
438 		if (isquery)
439 			psf->sf_gsresp = 0;
440 
441 		if (AVAILABLE(skb) < sizeof(__be32) +
442 		    first*sizeof(struct igmpv3_grec)) {
443 			if (truncate && !first)
444 				break;	 /* truncate these */
445 			if (pgr)
446 				pgr->grec_nsrcs = htons(scount);
447 			if (skb)
448 				igmpv3_sendpack(skb);
449 			skb = igmpv3_newpack(dev, dev->mtu);
450 			first = 1;
451 			scount = 0;
452 		}
453 		if (first) {
454 			skb = add_grhead(skb, pmc, type, &pgr);
455 			first = 0;
456 		}
457 		if (!skb)
458 			return NULL;
459 		psrc = (__be32 *)skb_put(skb, sizeof(__be32));
460 		*psrc = psf->sf_inaddr;
461 		scount++; stotal++;
462 		if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
463 		     type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
464 			psf->sf_crcount--;
465 			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
466 				if (psf_prev)
467 					psf_prev->sf_next = psf->sf_next;
468 				else
469 					*psf_list = psf->sf_next;
470 				kfree(psf);
471 				continue;
472 			}
473 		}
474 		psf_prev = psf;
475 	}
476 
477 empty_source:
478 	if (!stotal) {
479 		if (type == IGMPV3_ALLOW_NEW_SOURCES ||
480 		    type == IGMPV3_BLOCK_OLD_SOURCES)
481 			return skb;
482 		if (pmc->crcount || isquery) {
483 			/* make sure we have room for group header */
484 			if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
485 				igmpv3_sendpack(skb);
486 				skb = NULL; /* add_grhead will get a new one */
487 			}
488 			skb = add_grhead(skb, pmc, type, &pgr);
489 		}
490 	}
491 	if (pgr)
492 		pgr->grec_nsrcs = htons(scount);
493 
494 	if (isquery)
495 		pmc->gsquery = 0;	/* clear query state on report */
496 	return skb;
497 }
498 
499 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
500 {
501 	struct sk_buff *skb = NULL;
502 	int type;
503 
504 	if (!pmc) {
505 		read_lock(&in_dev->mc_list_lock);
506 		for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
507 			if (pmc->multiaddr == IGMP_ALL_HOSTS)
508 				continue;
509 			spin_lock_bh(&pmc->lock);
510 			if (pmc->sfcount[MCAST_EXCLUDE])
511 				type = IGMPV3_MODE_IS_EXCLUDE;
512 			else
513 				type = IGMPV3_MODE_IS_INCLUDE;
514 			skb = add_grec(skb, pmc, type, 0, 0);
515 			spin_unlock_bh(&pmc->lock);
516 		}
517 		read_unlock(&in_dev->mc_list_lock);
518 	} else {
519 		spin_lock_bh(&pmc->lock);
520 		if (pmc->sfcount[MCAST_EXCLUDE])
521 			type = IGMPV3_MODE_IS_EXCLUDE;
522 		else
523 			type = IGMPV3_MODE_IS_INCLUDE;
524 		skb = add_grec(skb, pmc, type, 0, 0);
525 		spin_unlock_bh(&pmc->lock);
526 	}
527 	if (!skb)
528 		return 0;
529 	return igmpv3_sendpack(skb);
530 }
531 
532 /*
533  * remove zero-count source records from a source filter list
534  */
535 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
536 {
537 	struct ip_sf_list *psf_prev, *psf_next, *psf;
538 
539 	psf_prev = NULL;
540 	for (psf=*ppsf; psf; psf = psf_next) {
541 		psf_next = psf->sf_next;
542 		if (psf->sf_crcount == 0) {
543 			if (psf_prev)
544 				psf_prev->sf_next = psf->sf_next;
545 			else
546 				*ppsf = psf->sf_next;
547 			kfree(psf);
548 		} else
549 			psf_prev = psf;
550 	}
551 }
552 
553 static void igmpv3_send_cr(struct in_device *in_dev)
554 {
555 	struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
556 	struct sk_buff *skb = NULL;
557 	int type, dtype;
558 
559 	read_lock(&in_dev->mc_list_lock);
560 	spin_lock_bh(&in_dev->mc_tomb_lock);
561 
562 	/* deleted MCA's */
563 	pmc_prev = NULL;
564 	for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
565 		pmc_next = pmc->next;
566 		if (pmc->sfmode == MCAST_INCLUDE) {
567 			type = IGMPV3_BLOCK_OLD_SOURCES;
568 			dtype = IGMPV3_BLOCK_OLD_SOURCES;
569 			skb = add_grec(skb, pmc, type, 1, 0);
570 			skb = add_grec(skb, pmc, dtype, 1, 1);
571 		}
572 		if (pmc->crcount) {
573 			if (pmc->sfmode == MCAST_EXCLUDE) {
574 				type = IGMPV3_CHANGE_TO_INCLUDE;
575 				skb = add_grec(skb, pmc, type, 1, 0);
576 			}
577 			pmc->crcount--;
578 			if (pmc->crcount == 0) {
579 				igmpv3_clear_zeros(&pmc->tomb);
580 				igmpv3_clear_zeros(&pmc->sources);
581 			}
582 		}
583 		if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
584 			if (pmc_prev)
585 				pmc_prev->next = pmc_next;
586 			else
587 				in_dev->mc_tomb = pmc_next;
588 			in_dev_put(pmc->interface);
589 			kfree(pmc);
590 		} else
591 			pmc_prev = pmc;
592 	}
593 	spin_unlock_bh(&in_dev->mc_tomb_lock);
594 
595 	/* change recs */
596 	for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
597 		spin_lock_bh(&pmc->lock);
598 		if (pmc->sfcount[MCAST_EXCLUDE]) {
599 			type = IGMPV3_BLOCK_OLD_SOURCES;
600 			dtype = IGMPV3_ALLOW_NEW_SOURCES;
601 		} else {
602 			type = IGMPV3_ALLOW_NEW_SOURCES;
603 			dtype = IGMPV3_BLOCK_OLD_SOURCES;
604 		}
605 		skb = add_grec(skb, pmc, type, 0, 0);
606 		skb = add_grec(skb, pmc, dtype, 0, 1);	/* deleted sources */
607 
608 		/* filter mode changes */
609 		if (pmc->crcount) {
610 			if (pmc->sfmode == MCAST_EXCLUDE)
611 				type = IGMPV3_CHANGE_TO_EXCLUDE;
612 			else
613 				type = IGMPV3_CHANGE_TO_INCLUDE;
614 			skb = add_grec(skb, pmc, type, 0, 0);
615 			pmc->crcount--;
616 		}
617 		spin_unlock_bh(&pmc->lock);
618 	}
619 	read_unlock(&in_dev->mc_list_lock);
620 
621 	if (!skb)
622 		return;
623 	(void) igmpv3_sendpack(skb);
624 }
625 
626 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
627 	int type)
628 {
629 	struct sk_buff *skb;
630 	struct iphdr *iph;
631 	struct igmphdr *ih;
632 	struct rtable *rt;
633 	struct net_device *dev = in_dev->dev;
634 	__be32	group = pmc ? pmc->multiaddr : 0;
635 	__be32	dst;
636 
637 	if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
638 		return igmpv3_send_report(in_dev, pmc);
639 	else if (type == IGMP_HOST_LEAVE_MESSAGE)
640 		dst = IGMP_ALL_ROUTER;
641 	else
642 		dst = group;
643 
644 	{
645 		struct flowi fl = { .oif = dev->ifindex,
646 				    .nl_u = { .ip4_u = { .daddr = dst } },
647 				    .proto = IPPROTO_IGMP };
648 		if (ip_route_output_key(&init_net, &rt, &fl))
649 			return -1;
650 	}
651 	if (rt->rt_src == 0) {
652 		ip_rt_put(rt);
653 		return -1;
654 	}
655 
656 	skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC);
657 	if (skb == NULL) {
658 		ip_rt_put(rt);
659 		return -1;
660 	}
661 
662 	skb->dst = &rt->u.dst;
663 
664 	skb_reserve(skb, LL_RESERVED_SPACE(dev));
665 
666 	skb_reset_network_header(skb);
667 	iph = ip_hdr(skb);
668 	skb_put(skb, sizeof(struct iphdr) + 4);
669 
670 	iph->version  = 4;
671 	iph->ihl      = (sizeof(struct iphdr)+4)>>2;
672 	iph->tos      = 0xc0;
673 	iph->frag_off = htons(IP_DF);
674 	iph->ttl      = 1;
675 	iph->daddr    = dst;
676 	iph->saddr    = rt->rt_src;
677 	iph->protocol = IPPROTO_IGMP;
678 	ip_select_ident(iph, &rt->u.dst, NULL);
679 	((u8*)&iph[1])[0] = IPOPT_RA;
680 	((u8*)&iph[1])[1] = 4;
681 	((u8*)&iph[1])[2] = 0;
682 	((u8*)&iph[1])[3] = 0;
683 
684 	ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
685 	ih->type=type;
686 	ih->code=0;
687 	ih->csum=0;
688 	ih->group=group;
689 	ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
690 
691 	return ip_local_out(skb);
692 }
693 
694 static void igmp_gq_timer_expire(unsigned long data)
695 {
696 	struct in_device *in_dev = (struct in_device *)data;
697 
698 	in_dev->mr_gq_running = 0;
699 	igmpv3_send_report(in_dev, NULL);
700 	__in_dev_put(in_dev);
701 }
702 
703 static void igmp_ifc_timer_expire(unsigned long data)
704 {
705 	struct in_device *in_dev = (struct in_device *)data;
706 
707 	igmpv3_send_cr(in_dev);
708 	if (in_dev->mr_ifc_count) {
709 		in_dev->mr_ifc_count--;
710 		igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
711 	}
712 	__in_dev_put(in_dev);
713 }
714 
715 static void igmp_ifc_event(struct in_device *in_dev)
716 {
717 	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
718 		return;
719 	in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
720 		IGMP_Unsolicited_Report_Count;
721 	igmp_ifc_start_timer(in_dev, 1);
722 }
723 
724 
725 static void igmp_timer_expire(unsigned long data)
726 {
727 	struct ip_mc_list *im=(struct ip_mc_list *)data;
728 	struct in_device *in_dev = im->interface;
729 
730 	spin_lock(&im->lock);
731 	im->tm_running=0;
732 
733 	if (im->unsolicit_count) {
734 		im->unsolicit_count--;
735 		igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
736 	}
737 	im->reporter = 1;
738 	spin_unlock(&im->lock);
739 
740 	if (IGMP_V1_SEEN(in_dev))
741 		igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
742 	else if (IGMP_V2_SEEN(in_dev))
743 		igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
744 	else
745 		igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
746 
747 	ip_ma_put(im);
748 }
749 
750 /* mark EXCLUDE-mode sources */
751 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
752 {
753 	struct ip_sf_list *psf;
754 	int i, scount;
755 
756 	scount = 0;
757 	for (psf=pmc->sources; psf; psf=psf->sf_next) {
758 		if (scount == nsrcs)
759 			break;
760 		for (i=0; i<nsrcs; i++) {
761 			/* skip inactive filters */
762 			if (pmc->sfcount[MCAST_INCLUDE] ||
763 			    pmc->sfcount[MCAST_EXCLUDE] !=
764 			    psf->sf_count[MCAST_EXCLUDE])
765 				continue;
766 			if (srcs[i] == psf->sf_inaddr) {
767 				scount++;
768 				break;
769 			}
770 		}
771 	}
772 	pmc->gsquery = 0;
773 	if (scount == nsrcs)	/* all sources excluded */
774 		return 0;
775 	return 1;
776 }
777 
778 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
779 {
780 	struct ip_sf_list *psf;
781 	int i, scount;
782 
783 	if (pmc->sfmode == MCAST_EXCLUDE)
784 		return igmp_xmarksources(pmc, nsrcs, srcs);
785 
786 	/* mark INCLUDE-mode sources */
787 	scount = 0;
788 	for (psf=pmc->sources; psf; psf=psf->sf_next) {
789 		if (scount == nsrcs)
790 			break;
791 		for (i=0; i<nsrcs; i++)
792 			if (srcs[i] == psf->sf_inaddr) {
793 				psf->sf_gsresp = 1;
794 				scount++;
795 				break;
796 			}
797 	}
798 	if (!scount) {
799 		pmc->gsquery = 0;
800 		return 0;
801 	}
802 	pmc->gsquery = 1;
803 	return 1;
804 }
805 
806 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
807 {
808 	struct ip_mc_list *im;
809 
810 	/* Timers are only set for non-local groups */
811 
812 	if (group == IGMP_ALL_HOSTS)
813 		return;
814 
815 	read_lock(&in_dev->mc_list_lock);
816 	for (im=in_dev->mc_list; im!=NULL; im=im->next) {
817 		if (im->multiaddr == group) {
818 			igmp_stop_timer(im);
819 			break;
820 		}
821 	}
822 	read_unlock(&in_dev->mc_list_lock);
823 }
824 
825 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
826 	int len)
827 {
828 	struct igmphdr 		*ih = igmp_hdr(skb);
829 	struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
830 	struct ip_mc_list	*im;
831 	__be32			group = ih->group;
832 	int			max_delay;
833 	int			mark = 0;
834 
835 
836 	if (len == 8) {
837 		if (ih->code == 0) {
838 			/* Alas, old v1 router presents here. */
839 
840 			max_delay = IGMP_Query_Response_Interval;
841 			in_dev->mr_v1_seen = jiffies +
842 				IGMP_V1_Router_Present_Timeout;
843 			group = 0;
844 		} else {
845 			/* v2 router present */
846 			max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
847 			in_dev->mr_v2_seen = jiffies +
848 				IGMP_V2_Router_Present_Timeout;
849 		}
850 		/* cancel the interface change timer */
851 		in_dev->mr_ifc_count = 0;
852 		if (del_timer(&in_dev->mr_ifc_timer))
853 			__in_dev_put(in_dev);
854 		/* clear deleted report items */
855 		igmpv3_clear_delrec(in_dev);
856 	} else if (len < 12) {
857 		return;	/* ignore bogus packet; freed by caller */
858 	} else { /* v3 */
859 		if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
860 			return;
861 
862 		ih3 = igmpv3_query_hdr(skb);
863 		if (ih3->nsrcs) {
864 			if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
865 					   + ntohs(ih3->nsrcs)*sizeof(__be32)))
866 				return;
867 			ih3 = igmpv3_query_hdr(skb);
868 		}
869 
870 		max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
871 		if (!max_delay)
872 			max_delay = 1;	/* can't mod w/ 0 */
873 		in_dev->mr_maxdelay = max_delay;
874 		if (ih3->qrv)
875 			in_dev->mr_qrv = ih3->qrv;
876 		if (!group) { /* general query */
877 			if (ih3->nsrcs)
878 				return;	/* no sources allowed */
879 			igmp_gq_start_timer(in_dev);
880 			return;
881 		}
882 		/* mark sources to include, if group & source-specific */
883 		mark = ih3->nsrcs != 0;
884 	}
885 
886 	/*
887 	 * - Start the timers in all of our membership records
888 	 *   that the query applies to for the interface on
889 	 *   which the query arrived excl. those that belong
890 	 *   to a "local" group (224.0.0.X)
891 	 * - For timers already running check if they need to
892 	 *   be reset.
893 	 * - Use the igmp->igmp_code field as the maximum
894 	 *   delay possible
895 	 */
896 	read_lock(&in_dev->mc_list_lock);
897 	for (im=in_dev->mc_list; im!=NULL; im=im->next) {
898 		int changed;
899 
900 		if (group && group != im->multiaddr)
901 			continue;
902 		if (im->multiaddr == IGMP_ALL_HOSTS)
903 			continue;
904 		spin_lock_bh(&im->lock);
905 		if (im->tm_running)
906 			im->gsquery = im->gsquery && mark;
907 		else
908 			im->gsquery = mark;
909 		changed = !im->gsquery ||
910 			igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
911 		spin_unlock_bh(&im->lock);
912 		if (changed)
913 			igmp_mod_timer(im, max_delay);
914 	}
915 	read_unlock(&in_dev->mc_list_lock);
916 }
917 
918 int igmp_rcv(struct sk_buff *skb)
919 {
920 	/* This basically follows the spec line by line -- see RFC1112 */
921 	struct igmphdr *ih;
922 	struct in_device *in_dev = in_dev_get(skb->dev);
923 	int len = skb->len;
924 
925 	if (in_dev==NULL) {
926 		kfree_skb(skb);
927 		return 0;
928 	}
929 
930 	if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
931 		goto drop;
932 
933 	switch (skb->ip_summed) {
934 	case CHECKSUM_COMPLETE:
935 		if (!csum_fold(skb->csum))
936 			break;
937 		/* fall through */
938 	case CHECKSUM_NONE:
939 		skb->csum = 0;
940 		if (__skb_checksum_complete(skb))
941 			goto drop;
942 	}
943 
944 	ih = igmp_hdr(skb);
945 	switch (ih->type) {
946 	case IGMP_HOST_MEMBERSHIP_QUERY:
947 		igmp_heard_query(in_dev, skb, len);
948 		break;
949 	case IGMP_HOST_MEMBERSHIP_REPORT:
950 	case IGMPV2_HOST_MEMBERSHIP_REPORT:
951 	case IGMPV3_HOST_MEMBERSHIP_REPORT:
952 		/* Is it our report looped back? */
953 		if (((struct rtable*)skb->dst)->fl.iif == 0)
954 			break;
955 		/* don't rely on MC router hearing unicast reports */
956 		if (skb->pkt_type == PACKET_MULTICAST ||
957 		    skb->pkt_type == PACKET_BROADCAST)
958 			igmp_heard_report(in_dev, ih->group);
959 		break;
960 	case IGMP_PIM:
961 #ifdef CONFIG_IP_PIMSM_V1
962 		in_dev_put(in_dev);
963 		return pim_rcv_v1(skb);
964 #endif
965 	case IGMP_DVMRP:
966 	case IGMP_TRACE:
967 	case IGMP_HOST_LEAVE_MESSAGE:
968 	case IGMP_MTRACE:
969 	case IGMP_MTRACE_RESP:
970 		break;
971 	default:
972 		break;
973 	}
974 
975 drop:
976 	in_dev_put(in_dev);
977 	kfree_skb(skb);
978 	return 0;
979 }
980 
981 #endif
982 
983 
984 /*
985  *	Add a filter to a device
986  */
987 
988 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
989 {
990 	char buf[MAX_ADDR_LEN];
991 	struct net_device *dev = in_dev->dev;
992 
993 	/* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
994 	   We will get multicast token leakage, when IFF_MULTICAST
995 	   is changed. This check should be done in dev->set_multicast_list
996 	   routine. Something sort of:
997 	   if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
998 	   --ANK
999 	   */
1000 	if (arp_mc_map(addr, buf, dev, 0) == 0)
1001 		dev_mc_add(dev,buf,dev->addr_len,0);
1002 }
1003 
1004 /*
1005  *	Remove a filter from a device
1006  */
1007 
1008 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1009 {
1010 	char buf[MAX_ADDR_LEN];
1011 	struct net_device *dev = in_dev->dev;
1012 
1013 	if (arp_mc_map(addr, buf, dev, 0) == 0)
1014 		dev_mc_delete(dev,buf,dev->addr_len,0);
1015 }
1016 
1017 #ifdef CONFIG_IP_MULTICAST
1018 /*
1019  * deleted ip_mc_list manipulation
1020  */
1021 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1022 {
1023 	struct ip_mc_list *pmc;
1024 
1025 	/* this is an "ip_mc_list" for convenience; only the fields below
1026 	 * are actually used. In particular, the refcnt and users are not
1027 	 * used for management of the delete list. Using the same structure
1028 	 * for deleted items allows change reports to use common code with
1029 	 * non-deleted or query-response MCA's.
1030 	 */
1031 	pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1032 	if (!pmc)
1033 		return;
1034 	spin_lock_bh(&im->lock);
1035 	pmc->interface = im->interface;
1036 	in_dev_hold(in_dev);
1037 	pmc->multiaddr = im->multiaddr;
1038 	pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1039 		IGMP_Unsolicited_Report_Count;
1040 	pmc->sfmode = im->sfmode;
1041 	if (pmc->sfmode == MCAST_INCLUDE) {
1042 		struct ip_sf_list *psf;
1043 
1044 		pmc->tomb = im->tomb;
1045 		pmc->sources = im->sources;
1046 		im->tomb = im->sources = NULL;
1047 		for (psf=pmc->sources; psf; psf=psf->sf_next)
1048 			psf->sf_crcount = pmc->crcount;
1049 	}
1050 	spin_unlock_bh(&im->lock);
1051 
1052 	spin_lock_bh(&in_dev->mc_tomb_lock);
1053 	pmc->next = in_dev->mc_tomb;
1054 	in_dev->mc_tomb = pmc;
1055 	spin_unlock_bh(&in_dev->mc_tomb_lock);
1056 }
1057 
1058 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1059 {
1060 	struct ip_mc_list *pmc, *pmc_prev;
1061 	struct ip_sf_list *psf, *psf_next;
1062 
1063 	spin_lock_bh(&in_dev->mc_tomb_lock);
1064 	pmc_prev = NULL;
1065 	for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1066 		if (pmc->multiaddr == multiaddr)
1067 			break;
1068 		pmc_prev = pmc;
1069 	}
1070 	if (pmc) {
1071 		if (pmc_prev)
1072 			pmc_prev->next = pmc->next;
1073 		else
1074 			in_dev->mc_tomb = pmc->next;
1075 	}
1076 	spin_unlock_bh(&in_dev->mc_tomb_lock);
1077 	if (pmc) {
1078 		for (psf=pmc->tomb; psf; psf=psf_next) {
1079 			psf_next = psf->sf_next;
1080 			kfree(psf);
1081 		}
1082 		in_dev_put(pmc->interface);
1083 		kfree(pmc);
1084 	}
1085 }
1086 
1087 static void igmpv3_clear_delrec(struct in_device *in_dev)
1088 {
1089 	struct ip_mc_list *pmc, *nextpmc;
1090 
1091 	spin_lock_bh(&in_dev->mc_tomb_lock);
1092 	pmc = in_dev->mc_tomb;
1093 	in_dev->mc_tomb = NULL;
1094 	spin_unlock_bh(&in_dev->mc_tomb_lock);
1095 
1096 	for (; pmc; pmc = nextpmc) {
1097 		nextpmc = pmc->next;
1098 		ip_mc_clear_src(pmc);
1099 		in_dev_put(pmc->interface);
1100 		kfree(pmc);
1101 	}
1102 	/* clear dead sources, too */
1103 	read_lock(&in_dev->mc_list_lock);
1104 	for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1105 		struct ip_sf_list *psf, *psf_next;
1106 
1107 		spin_lock_bh(&pmc->lock);
1108 		psf = pmc->tomb;
1109 		pmc->tomb = NULL;
1110 		spin_unlock_bh(&pmc->lock);
1111 		for (; psf; psf=psf_next) {
1112 			psf_next = psf->sf_next;
1113 			kfree(psf);
1114 		}
1115 	}
1116 	read_unlock(&in_dev->mc_list_lock);
1117 }
1118 #endif
1119 
1120 static void igmp_group_dropped(struct ip_mc_list *im)
1121 {
1122 	struct in_device *in_dev = im->interface;
1123 #ifdef CONFIG_IP_MULTICAST
1124 	int reporter;
1125 #endif
1126 
1127 	if (im->loaded) {
1128 		im->loaded = 0;
1129 		ip_mc_filter_del(in_dev, im->multiaddr);
1130 	}
1131 
1132 #ifdef CONFIG_IP_MULTICAST
1133 	if (im->multiaddr == IGMP_ALL_HOSTS)
1134 		return;
1135 
1136 	reporter = im->reporter;
1137 	igmp_stop_timer(im);
1138 
1139 	if (!in_dev->dead) {
1140 		if (IGMP_V1_SEEN(in_dev))
1141 			goto done;
1142 		if (IGMP_V2_SEEN(in_dev)) {
1143 			if (reporter)
1144 				igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1145 			goto done;
1146 		}
1147 		/* IGMPv3 */
1148 		igmpv3_add_delrec(in_dev, im);
1149 
1150 		igmp_ifc_event(in_dev);
1151 	}
1152 done:
1153 #endif
1154 	ip_mc_clear_src(im);
1155 }
1156 
1157 static void igmp_group_added(struct ip_mc_list *im)
1158 {
1159 	struct in_device *in_dev = im->interface;
1160 
1161 	if (im->loaded == 0) {
1162 		im->loaded = 1;
1163 		ip_mc_filter_add(in_dev, im->multiaddr);
1164 	}
1165 
1166 #ifdef CONFIG_IP_MULTICAST
1167 	if (im->multiaddr == IGMP_ALL_HOSTS)
1168 		return;
1169 
1170 	if (in_dev->dead)
1171 		return;
1172 	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1173 		spin_lock_bh(&im->lock);
1174 		igmp_start_timer(im, IGMP_Initial_Report_Delay);
1175 		spin_unlock_bh(&im->lock);
1176 		return;
1177 	}
1178 	/* else, v3 */
1179 
1180 	im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1181 		IGMP_Unsolicited_Report_Count;
1182 	igmp_ifc_event(in_dev);
1183 #endif
1184 }
1185 
1186 
1187 /*
1188  *	Multicast list managers
1189  */
1190 
1191 
1192 /*
1193  *	A socket has joined a multicast group on device dev.
1194  */
1195 
1196 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1197 {
1198 	struct ip_mc_list *im;
1199 
1200 	ASSERT_RTNL();
1201 
1202 	for (im=in_dev->mc_list; im; im=im->next) {
1203 		if (im->multiaddr == addr) {
1204 			im->users++;
1205 			ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1206 			goto out;
1207 		}
1208 	}
1209 
1210 	im = kmalloc(sizeof(*im), GFP_KERNEL);
1211 	if (!im)
1212 		goto out;
1213 
1214 	im->users=1;
1215 	im->interface=in_dev;
1216 	in_dev_hold(in_dev);
1217 	im->multiaddr=addr;
1218 	/* initial mode is (EX, empty) */
1219 	im->sfmode = MCAST_EXCLUDE;
1220 	im->sfcount[MCAST_INCLUDE] = 0;
1221 	im->sfcount[MCAST_EXCLUDE] = 1;
1222 	im->sources = NULL;
1223 	im->tomb = NULL;
1224 	im->crcount = 0;
1225 	atomic_set(&im->refcnt, 1);
1226 	spin_lock_init(&im->lock);
1227 #ifdef CONFIG_IP_MULTICAST
1228 	im->tm_running=0;
1229 	setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1230 	im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1231 	im->reporter = 0;
1232 	im->gsquery = 0;
1233 #endif
1234 	im->loaded = 0;
1235 	write_lock_bh(&in_dev->mc_list_lock);
1236 	im->next=in_dev->mc_list;
1237 	in_dev->mc_list=im;
1238 	write_unlock_bh(&in_dev->mc_list_lock);
1239 #ifdef CONFIG_IP_MULTICAST
1240 	igmpv3_del_delrec(in_dev, im->multiaddr);
1241 #endif
1242 	igmp_group_added(im);
1243 	if (!in_dev->dead)
1244 		ip_rt_multicast_event(in_dev);
1245 out:
1246 	return;
1247 }
1248 
1249 /*
1250  *	Resend IGMP JOIN report; used for bonding.
1251  */
1252 void ip_mc_rejoin_group(struct ip_mc_list *im)
1253 {
1254 #ifdef CONFIG_IP_MULTICAST
1255 	struct in_device *in_dev = im->interface;
1256 
1257 	if (im->multiaddr == IGMP_ALL_HOSTS)
1258 		return;
1259 
1260 	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1261 		igmp_mod_timer(im, IGMP_Initial_Report_Delay);
1262 		return;
1263 	}
1264 	/* else, v3 */
1265 	im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1266 		IGMP_Unsolicited_Report_Count;
1267 	igmp_ifc_event(in_dev);
1268 #endif
1269 }
1270 
1271 /*
1272  *	A socket has left a multicast group on device dev
1273  */
1274 
1275 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1276 {
1277 	struct ip_mc_list *i, **ip;
1278 
1279 	ASSERT_RTNL();
1280 
1281 	for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) {
1282 		if (i->multiaddr==addr) {
1283 			if (--i->users == 0) {
1284 				write_lock_bh(&in_dev->mc_list_lock);
1285 				*ip = i->next;
1286 				write_unlock_bh(&in_dev->mc_list_lock);
1287 				igmp_group_dropped(i);
1288 
1289 				if (!in_dev->dead)
1290 					ip_rt_multicast_event(in_dev);
1291 
1292 				ip_ma_put(i);
1293 				return;
1294 			}
1295 			break;
1296 		}
1297 	}
1298 }
1299 
1300 /* Device going down */
1301 
1302 void ip_mc_down(struct in_device *in_dev)
1303 {
1304 	struct ip_mc_list *i;
1305 
1306 	ASSERT_RTNL();
1307 
1308 	for (i=in_dev->mc_list; i; i=i->next)
1309 		igmp_group_dropped(i);
1310 
1311 #ifdef CONFIG_IP_MULTICAST
1312 	in_dev->mr_ifc_count = 0;
1313 	if (del_timer(&in_dev->mr_ifc_timer))
1314 		__in_dev_put(in_dev);
1315 	in_dev->mr_gq_running = 0;
1316 	if (del_timer(&in_dev->mr_gq_timer))
1317 		__in_dev_put(in_dev);
1318 	igmpv3_clear_delrec(in_dev);
1319 #endif
1320 
1321 	ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1322 }
1323 
1324 void ip_mc_init_dev(struct in_device *in_dev)
1325 {
1326 	ASSERT_RTNL();
1327 
1328 	in_dev->mc_tomb = NULL;
1329 #ifdef CONFIG_IP_MULTICAST
1330 	in_dev->mr_gq_running = 0;
1331 	setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1332 			(unsigned long)in_dev);
1333 	in_dev->mr_ifc_count = 0;
1334 	setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1335 			(unsigned long)in_dev);
1336 	in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1337 #endif
1338 
1339 	rwlock_init(&in_dev->mc_list_lock);
1340 	spin_lock_init(&in_dev->mc_tomb_lock);
1341 }
1342 
1343 /* Device going up */
1344 
1345 void ip_mc_up(struct in_device *in_dev)
1346 {
1347 	struct ip_mc_list *i;
1348 
1349 	ASSERT_RTNL();
1350 
1351 	ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1352 
1353 	for (i=in_dev->mc_list; i; i=i->next)
1354 		igmp_group_added(i);
1355 }
1356 
1357 /*
1358  *	Device is about to be destroyed: clean up.
1359  */
1360 
1361 void ip_mc_destroy_dev(struct in_device *in_dev)
1362 {
1363 	struct ip_mc_list *i;
1364 
1365 	ASSERT_RTNL();
1366 
1367 	/* Deactivate timers */
1368 	ip_mc_down(in_dev);
1369 
1370 	write_lock_bh(&in_dev->mc_list_lock);
1371 	while ((i = in_dev->mc_list) != NULL) {
1372 		in_dev->mc_list = i->next;
1373 		write_unlock_bh(&in_dev->mc_list_lock);
1374 
1375 		igmp_group_dropped(i);
1376 		ip_ma_put(i);
1377 
1378 		write_lock_bh(&in_dev->mc_list_lock);
1379 	}
1380 	write_unlock_bh(&in_dev->mc_list_lock);
1381 }
1382 
1383 static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr)
1384 {
1385 	struct flowi fl = { .nl_u = { .ip4_u =
1386 				      { .daddr = imr->imr_multiaddr.s_addr } } };
1387 	struct rtable *rt;
1388 	struct net_device *dev = NULL;
1389 	struct in_device *idev = NULL;
1390 
1391 	if (imr->imr_ifindex) {
1392 		idev = inetdev_by_index(&init_net, imr->imr_ifindex);
1393 		if (idev)
1394 			__in_dev_put(idev);
1395 		return idev;
1396 	}
1397 	if (imr->imr_address.s_addr) {
1398 		dev = ip_dev_find(&init_net, imr->imr_address.s_addr);
1399 		if (!dev)
1400 			return NULL;
1401 		dev_put(dev);
1402 	}
1403 
1404 	if (!dev && !ip_route_output_key(&init_net, &rt, &fl)) {
1405 		dev = rt->u.dst.dev;
1406 		ip_rt_put(rt);
1407 	}
1408 	if (dev) {
1409 		imr->imr_ifindex = dev->ifindex;
1410 		idev = __in_dev_get_rtnl(dev);
1411 	}
1412 	return idev;
1413 }
1414 
1415 /*
1416  *	Join a socket to a group
1417  */
1418 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1419 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1420 
1421 
1422 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1423 	__be32 *psfsrc)
1424 {
1425 	struct ip_sf_list *psf, *psf_prev;
1426 	int rv = 0;
1427 
1428 	psf_prev = NULL;
1429 	for (psf=pmc->sources; psf; psf=psf->sf_next) {
1430 		if (psf->sf_inaddr == *psfsrc)
1431 			break;
1432 		psf_prev = psf;
1433 	}
1434 	if (!psf || psf->sf_count[sfmode] == 0) {
1435 		/* source filter not found, or count wrong =>  bug */
1436 		return -ESRCH;
1437 	}
1438 	psf->sf_count[sfmode]--;
1439 	if (psf->sf_count[sfmode] == 0) {
1440 		ip_rt_multicast_event(pmc->interface);
1441 	}
1442 	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1443 #ifdef CONFIG_IP_MULTICAST
1444 		struct in_device *in_dev = pmc->interface;
1445 #endif
1446 
1447 		/* no more filters for this source */
1448 		if (psf_prev)
1449 			psf_prev->sf_next = psf->sf_next;
1450 		else
1451 			pmc->sources = psf->sf_next;
1452 #ifdef CONFIG_IP_MULTICAST
1453 		if (psf->sf_oldin &&
1454 		    !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1455 			psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1456 				IGMP_Unsolicited_Report_Count;
1457 			psf->sf_next = pmc->tomb;
1458 			pmc->tomb = psf;
1459 			rv = 1;
1460 		} else
1461 #endif
1462 			kfree(psf);
1463 	}
1464 	return rv;
1465 }
1466 
1467 #ifndef CONFIG_IP_MULTICAST
1468 #define igmp_ifc_event(x)	do { } while (0)
1469 #endif
1470 
1471 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1472 			 int sfcount, __be32 *psfsrc, int delta)
1473 {
1474 	struct ip_mc_list *pmc;
1475 	int	changerec = 0;
1476 	int	i, err;
1477 
1478 	if (!in_dev)
1479 		return -ENODEV;
1480 	read_lock(&in_dev->mc_list_lock);
1481 	for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1482 		if (*pmca == pmc->multiaddr)
1483 			break;
1484 	}
1485 	if (!pmc) {
1486 		/* MCA not found?? bug */
1487 		read_unlock(&in_dev->mc_list_lock);
1488 		return -ESRCH;
1489 	}
1490 	spin_lock_bh(&pmc->lock);
1491 	read_unlock(&in_dev->mc_list_lock);
1492 #ifdef CONFIG_IP_MULTICAST
1493 	sf_markstate(pmc);
1494 #endif
1495 	if (!delta) {
1496 		err = -EINVAL;
1497 		if (!pmc->sfcount[sfmode])
1498 			goto out_unlock;
1499 		pmc->sfcount[sfmode]--;
1500 	}
1501 	err = 0;
1502 	for (i=0; i<sfcount; i++) {
1503 		int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1504 
1505 		changerec |= rv > 0;
1506 		if (!err && rv < 0)
1507 			err = rv;
1508 	}
1509 	if (pmc->sfmode == MCAST_EXCLUDE &&
1510 	    pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1511 	    pmc->sfcount[MCAST_INCLUDE]) {
1512 #ifdef CONFIG_IP_MULTICAST
1513 		struct ip_sf_list *psf;
1514 #endif
1515 
1516 		/* filter mode change */
1517 		pmc->sfmode = MCAST_INCLUDE;
1518 #ifdef CONFIG_IP_MULTICAST
1519 		pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1520 			IGMP_Unsolicited_Report_Count;
1521 		in_dev->mr_ifc_count = pmc->crcount;
1522 		for (psf=pmc->sources; psf; psf = psf->sf_next)
1523 			psf->sf_crcount = 0;
1524 		igmp_ifc_event(pmc->interface);
1525 	} else if (sf_setstate(pmc) || changerec) {
1526 		igmp_ifc_event(pmc->interface);
1527 #endif
1528 	}
1529 out_unlock:
1530 	spin_unlock_bh(&pmc->lock);
1531 	return err;
1532 }
1533 
1534 /*
1535  * Add multicast single-source filter to the interface list
1536  */
1537 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1538 	__be32 *psfsrc, int delta)
1539 {
1540 	struct ip_sf_list *psf, *psf_prev;
1541 
1542 	psf_prev = NULL;
1543 	for (psf=pmc->sources; psf; psf=psf->sf_next) {
1544 		if (psf->sf_inaddr == *psfsrc)
1545 			break;
1546 		psf_prev = psf;
1547 	}
1548 	if (!psf) {
1549 		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1550 		if (!psf)
1551 			return -ENOBUFS;
1552 		psf->sf_inaddr = *psfsrc;
1553 		if (psf_prev) {
1554 			psf_prev->sf_next = psf;
1555 		} else
1556 			pmc->sources = psf;
1557 	}
1558 	psf->sf_count[sfmode]++;
1559 	if (psf->sf_count[sfmode] == 1) {
1560 		ip_rt_multicast_event(pmc->interface);
1561 	}
1562 	return 0;
1563 }
1564 
1565 #ifdef CONFIG_IP_MULTICAST
1566 static void sf_markstate(struct ip_mc_list *pmc)
1567 {
1568 	struct ip_sf_list *psf;
1569 	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1570 
1571 	for (psf=pmc->sources; psf; psf=psf->sf_next)
1572 		if (pmc->sfcount[MCAST_EXCLUDE]) {
1573 			psf->sf_oldin = mca_xcount ==
1574 				psf->sf_count[MCAST_EXCLUDE] &&
1575 				!psf->sf_count[MCAST_INCLUDE];
1576 		} else
1577 			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1578 }
1579 
1580 static int sf_setstate(struct ip_mc_list *pmc)
1581 {
1582 	struct ip_sf_list *psf, *dpsf;
1583 	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1584 	int qrv = pmc->interface->mr_qrv;
1585 	int new_in, rv;
1586 
1587 	rv = 0;
1588 	for (psf=pmc->sources; psf; psf=psf->sf_next) {
1589 		if (pmc->sfcount[MCAST_EXCLUDE]) {
1590 			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1591 				!psf->sf_count[MCAST_INCLUDE];
1592 		} else
1593 			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1594 		if (new_in) {
1595 			if (!psf->sf_oldin) {
1596 				struct ip_sf_list *prev = NULL;
1597 
1598 				for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1599 					if (dpsf->sf_inaddr == psf->sf_inaddr)
1600 						break;
1601 					prev = dpsf;
1602 				}
1603 				if (dpsf) {
1604 					if (prev)
1605 						prev->sf_next = dpsf->sf_next;
1606 					else
1607 						pmc->tomb = dpsf->sf_next;
1608 					kfree(dpsf);
1609 				}
1610 				psf->sf_crcount = qrv;
1611 				rv++;
1612 			}
1613 		} else if (psf->sf_oldin) {
1614 
1615 			psf->sf_crcount = 0;
1616 			/*
1617 			 * add or update "delete" records if an active filter
1618 			 * is now inactive
1619 			 */
1620 			for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1621 				if (dpsf->sf_inaddr == psf->sf_inaddr)
1622 					break;
1623 			if (!dpsf) {
1624 				dpsf = (struct ip_sf_list *)
1625 					kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1626 				if (!dpsf)
1627 					continue;
1628 				*dpsf = *psf;
1629 				/* pmc->lock held by callers */
1630 				dpsf->sf_next = pmc->tomb;
1631 				pmc->tomb = dpsf;
1632 			}
1633 			dpsf->sf_crcount = qrv;
1634 			rv++;
1635 		}
1636 	}
1637 	return rv;
1638 }
1639 #endif
1640 
1641 /*
1642  * Add multicast source filter list to the interface list
1643  */
1644 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1645 			 int sfcount, __be32 *psfsrc, int delta)
1646 {
1647 	struct ip_mc_list *pmc;
1648 	int	isexclude;
1649 	int	i, err;
1650 
1651 	if (!in_dev)
1652 		return -ENODEV;
1653 	read_lock(&in_dev->mc_list_lock);
1654 	for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) {
1655 		if (*pmca == pmc->multiaddr)
1656 			break;
1657 	}
1658 	if (!pmc) {
1659 		/* MCA not found?? bug */
1660 		read_unlock(&in_dev->mc_list_lock);
1661 		return -ESRCH;
1662 	}
1663 	spin_lock_bh(&pmc->lock);
1664 	read_unlock(&in_dev->mc_list_lock);
1665 
1666 #ifdef CONFIG_IP_MULTICAST
1667 	sf_markstate(pmc);
1668 #endif
1669 	isexclude = pmc->sfmode == MCAST_EXCLUDE;
1670 	if (!delta)
1671 		pmc->sfcount[sfmode]++;
1672 	err = 0;
1673 	for (i=0; i<sfcount; i++) {
1674 		err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1675 		if (err)
1676 			break;
1677 	}
1678 	if (err) {
1679 		int j;
1680 
1681 		pmc->sfcount[sfmode]--;
1682 		for (j=0; j<i; j++)
1683 			(void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1684 	} else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1685 #ifdef CONFIG_IP_MULTICAST
1686 		struct ip_sf_list *psf;
1687 		in_dev = pmc->interface;
1688 #endif
1689 
1690 		/* filter mode change */
1691 		if (pmc->sfcount[MCAST_EXCLUDE])
1692 			pmc->sfmode = MCAST_EXCLUDE;
1693 		else if (pmc->sfcount[MCAST_INCLUDE])
1694 			pmc->sfmode = MCAST_INCLUDE;
1695 #ifdef CONFIG_IP_MULTICAST
1696 		/* else no filters; keep old mode for reports */
1697 
1698 		pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1699 			IGMP_Unsolicited_Report_Count;
1700 		in_dev->mr_ifc_count = pmc->crcount;
1701 		for (psf=pmc->sources; psf; psf = psf->sf_next)
1702 			psf->sf_crcount = 0;
1703 		igmp_ifc_event(in_dev);
1704 	} else if (sf_setstate(pmc)) {
1705 		igmp_ifc_event(in_dev);
1706 #endif
1707 	}
1708 	spin_unlock_bh(&pmc->lock);
1709 	return err;
1710 }
1711 
1712 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1713 {
1714 	struct ip_sf_list *psf, *nextpsf;
1715 
1716 	for (psf=pmc->tomb; psf; psf=nextpsf) {
1717 		nextpsf = psf->sf_next;
1718 		kfree(psf);
1719 	}
1720 	pmc->tomb = NULL;
1721 	for (psf=pmc->sources; psf; psf=nextpsf) {
1722 		nextpsf = psf->sf_next;
1723 		kfree(psf);
1724 	}
1725 	pmc->sources = NULL;
1726 	pmc->sfmode = MCAST_EXCLUDE;
1727 	pmc->sfcount[MCAST_INCLUDE] = 0;
1728 	pmc->sfcount[MCAST_EXCLUDE] = 1;
1729 }
1730 
1731 
1732 /*
1733  * Join a multicast group
1734  */
1735 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1736 {
1737 	int err;
1738 	__be32 addr = imr->imr_multiaddr.s_addr;
1739 	struct ip_mc_socklist *iml=NULL, *i;
1740 	struct in_device *in_dev;
1741 	struct inet_sock *inet = inet_sk(sk);
1742 	int ifindex;
1743 	int count = 0;
1744 
1745 	if (!ipv4_is_multicast(addr))
1746 		return -EINVAL;
1747 
1748 	rtnl_lock();
1749 
1750 	in_dev = ip_mc_find_dev(imr);
1751 
1752 	if (!in_dev) {
1753 		iml = NULL;
1754 		err = -ENODEV;
1755 		goto done;
1756 	}
1757 
1758 	err = -EADDRINUSE;
1759 	ifindex = imr->imr_ifindex;
1760 	for (i = inet->mc_list; i; i = i->next) {
1761 		if (i->multi.imr_multiaddr.s_addr == addr &&
1762 		    i->multi.imr_ifindex == ifindex)
1763 			goto done;
1764 		count++;
1765 	}
1766 	err = -ENOBUFS;
1767 	if (count >= sysctl_igmp_max_memberships)
1768 		goto done;
1769 	iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL);
1770 	if (iml == NULL)
1771 		goto done;
1772 
1773 	memcpy(&iml->multi, imr, sizeof(*imr));
1774 	iml->next = inet->mc_list;
1775 	iml->sflist = NULL;
1776 	iml->sfmode = MCAST_EXCLUDE;
1777 	inet->mc_list = iml;
1778 	ip_mc_inc_group(in_dev, addr);
1779 	err = 0;
1780 done:
1781 	rtnl_unlock();
1782 	return err;
1783 }
1784 
1785 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1786 			   struct in_device *in_dev)
1787 {
1788 	int err;
1789 
1790 	if (iml->sflist == NULL) {
1791 		/* any-source empty exclude case */
1792 		return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1793 			iml->sfmode, 0, NULL, 0);
1794 	}
1795 	err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1796 			iml->sfmode, iml->sflist->sl_count,
1797 			iml->sflist->sl_addr, 0);
1798 	sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max));
1799 	iml->sflist = NULL;
1800 	return err;
1801 }
1802 
1803 /*
1804  *	Ask a socket to leave a group.
1805  */
1806 
1807 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1808 {
1809 	struct inet_sock *inet = inet_sk(sk);
1810 	struct ip_mc_socklist *iml, **imlp;
1811 	struct in_device *in_dev;
1812 	__be32 group = imr->imr_multiaddr.s_addr;
1813 	u32 ifindex;
1814 	int ret = -EADDRNOTAVAIL;
1815 
1816 	rtnl_lock();
1817 	in_dev = ip_mc_find_dev(imr);
1818 	ifindex = imr->imr_ifindex;
1819 	for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) {
1820 		if (iml->multi.imr_multiaddr.s_addr != group)
1821 			continue;
1822 		if (ifindex) {
1823 			if (iml->multi.imr_ifindex != ifindex)
1824 				continue;
1825 		} else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1826 				iml->multi.imr_address.s_addr)
1827 			continue;
1828 
1829 		(void) ip_mc_leave_src(sk, iml, in_dev);
1830 
1831 		*imlp = iml->next;
1832 
1833 		if (in_dev)
1834 			ip_mc_dec_group(in_dev, group);
1835 		rtnl_unlock();
1836 		sock_kfree_s(sk, iml, sizeof(*iml));
1837 		return 0;
1838 	}
1839 	if (!in_dev)
1840 		ret = -ENODEV;
1841 	rtnl_unlock();
1842 	return ret;
1843 }
1844 
1845 int ip_mc_source(int add, int omode, struct sock *sk, struct
1846 	ip_mreq_source *mreqs, int ifindex)
1847 {
1848 	int err;
1849 	struct ip_mreqn imr;
1850 	__be32 addr = mreqs->imr_multiaddr;
1851 	struct ip_mc_socklist *pmc;
1852 	struct in_device *in_dev = NULL;
1853 	struct inet_sock *inet = inet_sk(sk);
1854 	struct ip_sf_socklist *psl;
1855 	int leavegroup = 0;
1856 	int i, j, rv;
1857 
1858 	if (!ipv4_is_multicast(addr))
1859 		return -EINVAL;
1860 
1861 	rtnl_lock();
1862 
1863 	imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1864 	imr.imr_address.s_addr = mreqs->imr_interface;
1865 	imr.imr_ifindex = ifindex;
1866 	in_dev = ip_mc_find_dev(&imr);
1867 
1868 	if (!in_dev) {
1869 		err = -ENODEV;
1870 		goto done;
1871 	}
1872 	err = -EADDRNOTAVAIL;
1873 
1874 	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
1875 		if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr
1876 		    && pmc->multi.imr_ifindex == imr.imr_ifindex)
1877 			break;
1878 	}
1879 	if (!pmc) {		/* must have a prior join */
1880 		err = -EINVAL;
1881 		goto done;
1882 	}
1883 	/* if a source filter was set, must be the same mode as before */
1884 	if (pmc->sflist) {
1885 		if (pmc->sfmode != omode) {
1886 			err = -EINVAL;
1887 			goto done;
1888 		}
1889 	} else if (pmc->sfmode != omode) {
1890 		/* allow mode switches for empty-set filters */
1891 		ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1892 		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1893 			NULL, 0);
1894 		pmc->sfmode = omode;
1895 	}
1896 
1897 	psl = pmc->sflist;
1898 	if (!add) {
1899 		if (!psl)
1900 			goto done;	/* err = -EADDRNOTAVAIL */
1901 		rv = !0;
1902 		for (i=0; i<psl->sl_count; i++) {
1903 			rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1904 				sizeof(__be32));
1905 			if (rv == 0)
1906 				break;
1907 		}
1908 		if (rv)		/* source not found */
1909 			goto done;	/* err = -EADDRNOTAVAIL */
1910 
1911 		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
1912 		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1913 			leavegroup = 1;
1914 			goto done;
1915 		}
1916 
1917 		/* update the interface filter */
1918 		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1919 			&mreqs->imr_sourceaddr, 1);
1920 
1921 		for (j=i+1; j<psl->sl_count; j++)
1922 			psl->sl_addr[j-1] = psl->sl_addr[j];
1923 		psl->sl_count--;
1924 		err = 0;
1925 		goto done;
1926 	}
1927 	/* else, add a new source to the filter */
1928 
1929 	if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1930 		err = -ENOBUFS;
1931 		goto done;
1932 	}
1933 	if (!psl || psl->sl_count == psl->sl_max) {
1934 		struct ip_sf_socklist *newpsl;
1935 		int count = IP_SFBLOCK;
1936 
1937 		if (psl)
1938 			count += psl->sl_max;
1939 		newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1940 		if (!newpsl) {
1941 			err = -ENOBUFS;
1942 			goto done;
1943 		}
1944 		newpsl->sl_max = count;
1945 		newpsl->sl_count = count - IP_SFBLOCK;
1946 		if (psl) {
1947 			for (i=0; i<psl->sl_count; i++)
1948 				newpsl->sl_addr[i] = psl->sl_addr[i];
1949 			sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
1950 		}
1951 		pmc->sflist = psl = newpsl;
1952 	}
1953 	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
1954 	for (i=0; i<psl->sl_count; i++) {
1955 		rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1956 			sizeof(__be32));
1957 		if (rv == 0)
1958 			break;
1959 	}
1960 	if (rv == 0)		/* address already there is an error */
1961 		goto done;
1962 	for (j=psl->sl_count-1; j>=i; j--)
1963 		psl->sl_addr[j+1] = psl->sl_addr[j];
1964 	psl->sl_addr[i] = mreqs->imr_sourceaddr;
1965 	psl->sl_count++;
1966 	err = 0;
1967 	/* update the interface list */
1968 	ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1969 		&mreqs->imr_sourceaddr, 1);
1970 done:
1971 	rtnl_unlock();
1972 	if (leavegroup)
1973 		return ip_mc_leave_group(sk, &imr);
1974 	return err;
1975 }
1976 
1977 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
1978 {
1979 	int err = 0;
1980 	struct ip_mreqn	imr;
1981 	__be32 addr = msf->imsf_multiaddr;
1982 	struct ip_mc_socklist *pmc;
1983 	struct in_device *in_dev;
1984 	struct inet_sock *inet = inet_sk(sk);
1985 	struct ip_sf_socklist *newpsl, *psl;
1986 	int leavegroup = 0;
1987 
1988 	if (!ipv4_is_multicast(addr))
1989 		return -EINVAL;
1990 	if (msf->imsf_fmode != MCAST_INCLUDE &&
1991 	    msf->imsf_fmode != MCAST_EXCLUDE)
1992 		return -EINVAL;
1993 
1994 	rtnl_lock();
1995 
1996 	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
1997 	imr.imr_address.s_addr = msf->imsf_interface;
1998 	imr.imr_ifindex = ifindex;
1999 	in_dev = ip_mc_find_dev(&imr);
2000 
2001 	if (!in_dev) {
2002 		err = -ENODEV;
2003 		goto done;
2004 	}
2005 
2006 	/* special case - (INCLUDE, empty) == LEAVE_GROUP */
2007 	if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2008 		leavegroup = 1;
2009 		goto done;
2010 	}
2011 
2012 	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2013 		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2014 		    pmc->multi.imr_ifindex == imr.imr_ifindex)
2015 			break;
2016 	}
2017 	if (!pmc) {		/* must have a prior join */
2018 		err = -EINVAL;
2019 		goto done;
2020 	}
2021 	if (msf->imsf_numsrc) {
2022 		newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2023 							   GFP_KERNEL);
2024 		if (!newpsl) {
2025 			err = -ENOBUFS;
2026 			goto done;
2027 		}
2028 		newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2029 		memcpy(newpsl->sl_addr, msf->imsf_slist,
2030 			msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2031 		err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2032 			msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2033 		if (err) {
2034 			sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2035 			goto done;
2036 		}
2037 	} else {
2038 		newpsl = NULL;
2039 		(void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2040 				     msf->imsf_fmode, 0, NULL, 0);
2041 	}
2042 	psl = pmc->sflist;
2043 	if (psl) {
2044 		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2045 			psl->sl_count, psl->sl_addr, 0);
2046 		sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max));
2047 	} else
2048 		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2049 			0, NULL, 0);
2050 	pmc->sflist = newpsl;
2051 	pmc->sfmode = msf->imsf_fmode;
2052 	err = 0;
2053 done:
2054 	rtnl_unlock();
2055 	if (leavegroup)
2056 		err = ip_mc_leave_group(sk, &imr);
2057 	return err;
2058 }
2059 
2060 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2061 	struct ip_msfilter __user *optval, int __user *optlen)
2062 {
2063 	int err, len, count, copycount;
2064 	struct ip_mreqn	imr;
2065 	__be32 addr = msf->imsf_multiaddr;
2066 	struct ip_mc_socklist *pmc;
2067 	struct in_device *in_dev;
2068 	struct inet_sock *inet = inet_sk(sk);
2069 	struct ip_sf_socklist *psl;
2070 
2071 	if (!ipv4_is_multicast(addr))
2072 		return -EINVAL;
2073 
2074 	rtnl_lock();
2075 
2076 	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2077 	imr.imr_address.s_addr = msf->imsf_interface;
2078 	imr.imr_ifindex = 0;
2079 	in_dev = ip_mc_find_dev(&imr);
2080 
2081 	if (!in_dev) {
2082 		err = -ENODEV;
2083 		goto done;
2084 	}
2085 	err = -EADDRNOTAVAIL;
2086 
2087 	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2088 		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2089 		    pmc->multi.imr_ifindex == imr.imr_ifindex)
2090 			break;
2091 	}
2092 	if (!pmc)		/* must have a prior join */
2093 		goto done;
2094 	msf->imsf_fmode = pmc->sfmode;
2095 	psl = pmc->sflist;
2096 	rtnl_unlock();
2097 	if (!psl) {
2098 		len = 0;
2099 		count = 0;
2100 	} else {
2101 		count = psl->sl_count;
2102 	}
2103 	copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2104 	len = copycount * sizeof(psl->sl_addr[0]);
2105 	msf->imsf_numsrc = count;
2106 	if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2107 	    copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2108 		return -EFAULT;
2109 	}
2110 	if (len &&
2111 	    copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2112 		return -EFAULT;
2113 	return 0;
2114 done:
2115 	rtnl_unlock();
2116 	return err;
2117 }
2118 
2119 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2120 	struct group_filter __user *optval, int __user *optlen)
2121 {
2122 	int err, i, count, copycount;
2123 	struct sockaddr_in *psin;
2124 	__be32 addr;
2125 	struct ip_mc_socklist *pmc;
2126 	struct inet_sock *inet = inet_sk(sk);
2127 	struct ip_sf_socklist *psl;
2128 
2129 	psin = (struct sockaddr_in *)&gsf->gf_group;
2130 	if (psin->sin_family != AF_INET)
2131 		return -EINVAL;
2132 	addr = psin->sin_addr.s_addr;
2133 	if (!ipv4_is_multicast(addr))
2134 		return -EINVAL;
2135 
2136 	rtnl_lock();
2137 
2138 	err = -EADDRNOTAVAIL;
2139 
2140 	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2141 		if (pmc->multi.imr_multiaddr.s_addr == addr &&
2142 		    pmc->multi.imr_ifindex == gsf->gf_interface)
2143 			break;
2144 	}
2145 	if (!pmc)		/* must have a prior join */
2146 		goto done;
2147 	gsf->gf_fmode = pmc->sfmode;
2148 	psl = pmc->sflist;
2149 	rtnl_unlock();
2150 	count = psl ? psl->sl_count : 0;
2151 	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2152 	gsf->gf_numsrc = count;
2153 	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2154 	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2155 		return -EFAULT;
2156 	}
2157 	for (i=0; i<copycount; i++) {
2158 		struct sockaddr_storage ss;
2159 
2160 		psin = (struct sockaddr_in *)&ss;
2161 		memset(&ss, 0, sizeof(ss));
2162 		psin->sin_family = AF_INET;
2163 		psin->sin_addr.s_addr = psl->sl_addr[i];
2164 		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2165 			return -EFAULT;
2166 	}
2167 	return 0;
2168 done:
2169 	rtnl_unlock();
2170 	return err;
2171 }
2172 
2173 /*
2174  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2175  */
2176 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2177 {
2178 	struct inet_sock *inet = inet_sk(sk);
2179 	struct ip_mc_socklist *pmc;
2180 	struct ip_sf_socklist *psl;
2181 	int i;
2182 
2183 	if (!ipv4_is_multicast(loc_addr))
2184 		return 1;
2185 
2186 	for (pmc=inet->mc_list; pmc; pmc=pmc->next) {
2187 		if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2188 		    pmc->multi.imr_ifindex == dif)
2189 			break;
2190 	}
2191 	if (!pmc)
2192 		return 1;
2193 	psl = pmc->sflist;
2194 	if (!psl)
2195 		return pmc->sfmode == MCAST_EXCLUDE;
2196 
2197 	for (i=0; i<psl->sl_count; i++) {
2198 		if (psl->sl_addr[i] == rmt_addr)
2199 			break;
2200 	}
2201 	if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2202 		return 0;
2203 	if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2204 		return 0;
2205 	return 1;
2206 }
2207 
2208 /*
2209  *	A socket is closing.
2210  */
2211 
2212 void ip_mc_drop_socket(struct sock *sk)
2213 {
2214 	struct inet_sock *inet = inet_sk(sk);
2215 	struct ip_mc_socklist *iml;
2216 
2217 	if (inet->mc_list == NULL)
2218 		return;
2219 
2220 	rtnl_lock();
2221 	while ((iml = inet->mc_list) != NULL) {
2222 		struct in_device *in_dev;
2223 		inet->mc_list = iml->next;
2224 
2225 		in_dev = inetdev_by_index(&init_net, iml->multi.imr_ifindex);
2226 		(void) ip_mc_leave_src(sk, iml, in_dev);
2227 		if (in_dev != NULL) {
2228 			ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2229 			in_dev_put(in_dev);
2230 		}
2231 		sock_kfree_s(sk, iml, sizeof(*iml));
2232 	}
2233 	rtnl_unlock();
2234 }
2235 
2236 int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2237 {
2238 	struct ip_mc_list *im;
2239 	struct ip_sf_list *psf;
2240 	int rv = 0;
2241 
2242 	read_lock(&in_dev->mc_list_lock);
2243 	for (im=in_dev->mc_list; im; im=im->next) {
2244 		if (im->multiaddr == mc_addr)
2245 			break;
2246 	}
2247 	if (im && proto == IPPROTO_IGMP) {
2248 		rv = 1;
2249 	} else if (im) {
2250 		if (src_addr) {
2251 			for (psf=im->sources; psf; psf=psf->sf_next) {
2252 				if (psf->sf_inaddr == src_addr)
2253 					break;
2254 			}
2255 			if (psf)
2256 				rv = psf->sf_count[MCAST_INCLUDE] ||
2257 					psf->sf_count[MCAST_EXCLUDE] !=
2258 					im->sfcount[MCAST_EXCLUDE];
2259 			else
2260 				rv = im->sfcount[MCAST_EXCLUDE] != 0;
2261 		} else
2262 			rv = 1; /* unspecified source; tentatively allow */
2263 	}
2264 	read_unlock(&in_dev->mc_list_lock);
2265 	return rv;
2266 }
2267 
2268 #if defined(CONFIG_PROC_FS)
2269 struct igmp_mc_iter_state {
2270 	struct net_device *dev;
2271 	struct in_device *in_dev;
2272 };
2273 
2274 #define	igmp_mc_seq_private(seq)	((struct igmp_mc_iter_state *)(seq)->private)
2275 
2276 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2277 {
2278 	struct ip_mc_list *im = NULL;
2279 	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2280 
2281 	state->in_dev = NULL;
2282 	for_each_netdev(&init_net, state->dev) {
2283 		struct in_device *in_dev;
2284 		in_dev = in_dev_get(state->dev);
2285 		if (!in_dev)
2286 			continue;
2287 		read_lock(&in_dev->mc_list_lock);
2288 		im = in_dev->mc_list;
2289 		if (im) {
2290 			state->in_dev = in_dev;
2291 			break;
2292 		}
2293 		read_unlock(&in_dev->mc_list_lock);
2294 		in_dev_put(in_dev);
2295 	}
2296 	return im;
2297 }
2298 
2299 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2300 {
2301 	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2302 	im = im->next;
2303 	while (!im) {
2304 		if (likely(state->in_dev != NULL)) {
2305 			read_unlock(&state->in_dev->mc_list_lock);
2306 			in_dev_put(state->in_dev);
2307 		}
2308 		state->dev = next_net_device(state->dev);
2309 		if (!state->dev) {
2310 			state->in_dev = NULL;
2311 			break;
2312 		}
2313 		state->in_dev = in_dev_get(state->dev);
2314 		if (!state->in_dev)
2315 			continue;
2316 		read_lock(&state->in_dev->mc_list_lock);
2317 		im = state->in_dev->mc_list;
2318 	}
2319 	return im;
2320 }
2321 
2322 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2323 {
2324 	struct ip_mc_list *im = igmp_mc_get_first(seq);
2325 	if (im)
2326 		while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2327 			--pos;
2328 	return pos ? NULL : im;
2329 }
2330 
2331 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2332 	__acquires(dev_base_lock)
2333 {
2334 	read_lock(&dev_base_lock);
2335 	return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2336 }
2337 
2338 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2339 {
2340 	struct ip_mc_list *im;
2341 	if (v == SEQ_START_TOKEN)
2342 		im = igmp_mc_get_first(seq);
2343 	else
2344 		im = igmp_mc_get_next(seq, v);
2345 	++*pos;
2346 	return im;
2347 }
2348 
2349 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2350 	__releases(dev_base_lock)
2351 {
2352 	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2353 	if (likely(state->in_dev != NULL)) {
2354 		read_unlock(&state->in_dev->mc_list_lock);
2355 		in_dev_put(state->in_dev);
2356 		state->in_dev = NULL;
2357 	}
2358 	state->dev = NULL;
2359 	read_unlock(&dev_base_lock);
2360 }
2361 
2362 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2363 {
2364 	if (v == SEQ_START_TOKEN)
2365 		seq_puts(seq,
2366 			 "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2367 	else {
2368 		struct ip_mc_list *im = (struct ip_mc_list *)v;
2369 		struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2370 		char   *querier;
2371 #ifdef CONFIG_IP_MULTICAST
2372 		querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2373 			  IGMP_V2_SEEN(state->in_dev) ? "V2" :
2374 			  "V3";
2375 #else
2376 		querier = "NONE";
2377 #endif
2378 
2379 		if (state->in_dev->mc_list == im) {
2380 			seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2381 				   state->dev->ifindex, state->dev->name, state->dev->mc_count, querier);
2382 		}
2383 
2384 		seq_printf(seq,
2385 			   "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2386 			   im->multiaddr, im->users,
2387 			   im->tm_running, im->tm_running ?
2388 			   jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2389 			   im->reporter);
2390 	}
2391 	return 0;
2392 }
2393 
2394 static const struct seq_operations igmp_mc_seq_ops = {
2395 	.start	=	igmp_mc_seq_start,
2396 	.next	=	igmp_mc_seq_next,
2397 	.stop	=	igmp_mc_seq_stop,
2398 	.show	=	igmp_mc_seq_show,
2399 };
2400 
2401 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2402 {
2403 	return seq_open_private(file, &igmp_mc_seq_ops,
2404 			sizeof(struct igmp_mc_iter_state));
2405 }
2406 
2407 static const struct file_operations igmp_mc_seq_fops = {
2408 	.owner		=	THIS_MODULE,
2409 	.open		=	igmp_mc_seq_open,
2410 	.read		=	seq_read,
2411 	.llseek		=	seq_lseek,
2412 	.release	=	seq_release_private,
2413 };
2414 
2415 struct igmp_mcf_iter_state {
2416 	struct net_device *dev;
2417 	struct in_device *idev;
2418 	struct ip_mc_list *im;
2419 };
2420 
2421 #define igmp_mcf_seq_private(seq)	((struct igmp_mcf_iter_state *)(seq)->private)
2422 
2423 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2424 {
2425 	struct ip_sf_list *psf = NULL;
2426 	struct ip_mc_list *im = NULL;
2427 	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2428 
2429 	state->idev = NULL;
2430 	state->im = NULL;
2431 	for_each_netdev(&init_net, state->dev) {
2432 		struct in_device *idev;
2433 		idev = in_dev_get(state->dev);
2434 		if (unlikely(idev == NULL))
2435 			continue;
2436 		read_lock(&idev->mc_list_lock);
2437 		im = idev->mc_list;
2438 		if (likely(im != NULL)) {
2439 			spin_lock_bh(&im->lock);
2440 			psf = im->sources;
2441 			if (likely(psf != NULL)) {
2442 				state->im = im;
2443 				state->idev = idev;
2444 				break;
2445 			}
2446 			spin_unlock_bh(&im->lock);
2447 		}
2448 		read_unlock(&idev->mc_list_lock);
2449 		in_dev_put(idev);
2450 	}
2451 	return psf;
2452 }
2453 
2454 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2455 {
2456 	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2457 
2458 	psf = psf->sf_next;
2459 	while (!psf) {
2460 		spin_unlock_bh(&state->im->lock);
2461 		state->im = state->im->next;
2462 		while (!state->im) {
2463 			if (likely(state->idev != NULL)) {
2464 				read_unlock(&state->idev->mc_list_lock);
2465 				in_dev_put(state->idev);
2466 			}
2467 			state->dev = next_net_device(state->dev);
2468 			if (!state->dev) {
2469 				state->idev = NULL;
2470 				goto out;
2471 			}
2472 			state->idev = in_dev_get(state->dev);
2473 			if (!state->idev)
2474 				continue;
2475 			read_lock(&state->idev->mc_list_lock);
2476 			state->im = state->idev->mc_list;
2477 		}
2478 		if (!state->im)
2479 			break;
2480 		spin_lock_bh(&state->im->lock);
2481 		psf = state->im->sources;
2482 	}
2483 out:
2484 	return psf;
2485 }
2486 
2487 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2488 {
2489 	struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2490 	if (psf)
2491 		while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2492 			--pos;
2493 	return pos ? NULL : psf;
2494 }
2495 
2496 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2497 {
2498 	read_lock(&dev_base_lock);
2499 	return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2500 }
2501 
2502 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2503 {
2504 	struct ip_sf_list *psf;
2505 	if (v == SEQ_START_TOKEN)
2506 		psf = igmp_mcf_get_first(seq);
2507 	else
2508 		psf = igmp_mcf_get_next(seq, v);
2509 	++*pos;
2510 	return psf;
2511 }
2512 
2513 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2514 {
2515 	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2516 	if (likely(state->im != NULL)) {
2517 		spin_unlock_bh(&state->im->lock);
2518 		state->im = NULL;
2519 	}
2520 	if (likely(state->idev != NULL)) {
2521 		read_unlock(&state->idev->mc_list_lock);
2522 		in_dev_put(state->idev);
2523 		state->idev = NULL;
2524 	}
2525 	state->dev = NULL;
2526 	read_unlock(&dev_base_lock);
2527 }
2528 
2529 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2530 {
2531 	struct ip_sf_list *psf = (struct ip_sf_list *)v;
2532 	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2533 
2534 	if (v == SEQ_START_TOKEN) {
2535 		seq_printf(seq,
2536 			   "%3s %6s "
2537 			   "%10s %10s %6s %6s\n", "Idx",
2538 			   "Device", "MCA",
2539 			   "SRC", "INC", "EXC");
2540 	} else {
2541 		seq_printf(seq,
2542 			   "%3d %6.6s 0x%08x "
2543 			   "0x%08x %6lu %6lu\n",
2544 			   state->dev->ifindex, state->dev->name,
2545 			   ntohl(state->im->multiaddr),
2546 			   ntohl(psf->sf_inaddr),
2547 			   psf->sf_count[MCAST_INCLUDE],
2548 			   psf->sf_count[MCAST_EXCLUDE]);
2549 	}
2550 	return 0;
2551 }
2552 
2553 static const struct seq_operations igmp_mcf_seq_ops = {
2554 	.start	=	igmp_mcf_seq_start,
2555 	.next	=	igmp_mcf_seq_next,
2556 	.stop	=	igmp_mcf_seq_stop,
2557 	.show	=	igmp_mcf_seq_show,
2558 };
2559 
2560 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2561 {
2562 	return seq_open_private(file, &igmp_mcf_seq_ops,
2563 			sizeof(struct igmp_mcf_iter_state));
2564 }
2565 
2566 static const struct file_operations igmp_mcf_seq_fops = {
2567 	.owner		=	THIS_MODULE,
2568 	.open		=	igmp_mcf_seq_open,
2569 	.read		=	seq_read,
2570 	.llseek		=	seq_lseek,
2571 	.release	=	seq_release_private,
2572 };
2573 
2574 int __init igmp_mc_proc_init(void)
2575 {
2576 	proc_net_fops_create(&init_net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2577 	proc_net_fops_create(&init_net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2578 	return 0;
2579 }
2580 #endif
2581 
2582 EXPORT_SYMBOL(ip_mc_dec_group);
2583 EXPORT_SYMBOL(ip_mc_inc_group);
2584 EXPORT_SYMBOL(ip_mc_join_group);
2585 EXPORT_SYMBOL(ip_mc_rejoin_group);
2586