xref: /linux/net/ipv4/igmp.c (revision 2987ee196c88dbde0463dc87d5fb209c684e34a2)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *	Linux NET3:	Internet Group Management Protocol  [IGMP]
4  *
5  *	This code implements the IGMP protocol as defined in RFC1112. There has
6  *	been a further revision of this protocol since which is now supported.
7  *
8  *	If you have trouble with this module be careful what gcc you have used,
9  *	the older version didn't come out right using gcc 2.5.8, the newer one
10  *	seems to fall out with gcc 2.6.2.
11  *
12  *	Authors:
13  *		Alan Cox <alan@lxorguk.ukuu.org.uk>
14  *
15  *	Fixes:
16  *
17  *		Alan Cox	:	Added lots of __inline__ to optimise
18  *					the memory usage of all the tiny little
19  *					functions.
20  *		Alan Cox	:	Dumped the header building experiment.
21  *		Alan Cox	:	Minor tweaks ready for multicast routing
22  *					and extended IGMP protocol.
23  *		Alan Cox	:	Removed a load of inline directives. Gcc 2.5.8
24  *					writes utterly bogus code otherwise (sigh)
25  *					fixed IGMP loopback to behave in the manner
26  *					desired by mrouted, fixed the fact it has been
27  *					broken since 1.3.6 and cleaned up a few minor
28  *					points.
29  *
30  *		Chih-Jen Chang	:	Tried to revise IGMP to Version 2
31  *		Tsu-Sheng Tsao		E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
32  *					The enhancements are mainly based on Steve Deering's
33  * 					ipmulti-3.5 source code.
34  *		Chih-Jen Chang	:	Added the igmp_get_mrouter_info and
35  *		Tsu-Sheng Tsao		igmp_set_mrouter_info to keep track of
36  *					the mrouted version on that device.
37  *		Chih-Jen Chang	:	Added the max_resp_time parameter to
38  *		Tsu-Sheng Tsao		igmp_heard_query(). Using this parameter
39  *					to identify the multicast router version
40  *					and do what the IGMP version 2 specified.
41  *		Chih-Jen Chang	:	Added a timer to revert to IGMP V2 router
42  *		Tsu-Sheng Tsao		if the specified time expired.
43  *		Alan Cox	:	Stop IGMP from 0.0.0.0 being accepted.
44  *		Alan Cox	:	Use GFP_ATOMIC in the right places.
45  *		Christian Daudt :	igmp timer wasn't set for local group
46  *					memberships but was being deleted,
47  *					which caused a "del_timer() called
48  *					from %p with timer not initialized\n"
49  *					message (960131).
50  *		Christian Daudt :	removed del_timer from
51  *					igmp_timer_expire function (960205).
52  *             Christian Daudt :       igmp_heard_report now only calls
53  *                                     igmp_timer_expire if tm->running is
54  *                                     true (960216).
55  *		Malcolm Beattie :	ttl comparison wrong in igmp_rcv made
56  *					igmp_heard_query never trigger. Expiry
57  *					miscalculation fixed in igmp_heard_query
58  *					and random() made to return unsigned to
59  *					prevent negative expiry times.
60  *		Alexey Kuznetsov:	Wrong group leaving behaviour, backport
61  *					fix from pending 2.1.x patches.
62  *		Alan Cox:		Forget to enable FDDI support earlier.
63  *		Alexey Kuznetsov:	Fixed leaving groups on device down.
64  *		Alexey Kuznetsov:	Accordance to igmp-v2-06 draft.
65  *		David L Stevens:	IGMPv3 support, with help from
66  *					Vinay Kulkarni
67  */
68 
69 #include <linux/module.h>
70 #include <linux/slab.h>
71 #include <linux/uaccess.h>
72 #include <linux/types.h>
73 #include <linux/kernel.h>
74 #include <linux/jiffies.h>
75 #include <linux/string.h>
76 #include <linux/socket.h>
77 #include <linux/sockios.h>
78 #include <linux/in.h>
79 #include <linux/inet.h>
80 #include <linux/netdevice.h>
81 #include <linux/skbuff.h>
82 #include <linux/inetdevice.h>
83 #include <linux/igmp.h>
84 #include "igmp_internal.h"
85 #include <linux/if_arp.h>
86 #include <linux/rtnetlink.h>
87 #include <linux/times.h>
88 #include <linux/pkt_sched.h>
89 #include <linux/byteorder/generic.h>
90 
91 #include <net/net_namespace.h>
92 #include <net/netlink.h>
93 #include <net/addrconf.h>
94 #include <net/arp.h>
95 #include <net/ip.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
98 #include <net/sock.h>
99 #include <net/checksum.h>
100 #include <net/inet_common.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 #ifdef CONFIG_IP_MULTICAST
111 /* Parameter names and values are taken from igmp-v2-06 draft */
112 
113 #define IGMP_QUERY_INTERVAL			(125*HZ)
114 #define IGMP_QUERY_RESPONSE_INTERVAL		(10*HZ)
115 
116 #define IGMP_INITIAL_REPORT_DELAY		(1)
117 
118 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
119  * IGMP specs require to report membership immediately after
120  * joining a group, but we delay the first report by a
121  * small interval. It seems more natural and still does not
122  * contradict to specs provided this delay is small enough.
123  */
124 
125 static bool IGMP_V1_SEEN(const struct in_device *in_dev)
126 {
127 	unsigned long seen;
128 
129 	if (IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1)
130 		return true;
131 	if (IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1)
132 		return true;
133 	seen = READ_ONCE(in_dev->mr_v1_seen);
134 	return seen && time_before(jiffies, seen);
135 }
136 
137 static bool IGMP_V2_SEEN(const struct in_device *in_dev)
138 {
139 	unsigned long seen;
140 
141 	if (IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2)
142 		return true;
143 	if (IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2)
144 		return true;
145 	seen = READ_ONCE(in_dev->mr_v2_seen);
146 	return seen && time_before(jiffies, seen);
147 }
148 
149 static int unsolicited_report_interval(struct in_device *in_dev)
150 {
151 	int interval_ms, interval_jiffies;
152 
153 	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
154 		interval_ms = IN_DEV_CONF_GET(
155 			in_dev,
156 			IGMPV2_UNSOLICITED_REPORT_INTERVAL);
157 	else /* v3 */
158 		interval_ms = IN_DEV_CONF_GET(
159 			in_dev,
160 			IGMPV3_UNSOLICITED_REPORT_INTERVAL);
161 
162 	interval_jiffies = msecs_to_jiffies(interval_ms);
163 
164 	/* _timer functions can't handle a delay of 0 jiffies so ensure
165 	 *  we always return a positive value.
166 	 */
167 	if (interval_jiffies <= 0)
168 		interval_jiffies = 1;
169 	return interval_jiffies;
170 }
171 
172 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
173 			      gfp_t gfp);
174 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
175 static void igmpv3_clear_delrec(struct in_device *in_dev);
176 static int sf_setstate(struct ip_mc_list *pmc);
177 static void sf_markstate(struct ip_mc_list *pmc);
178 #endif
179 static void ip_mc_clear_src(struct ip_mc_list *pmc);
180 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
181 			 int sfcount, __be32 *psfsrc, int delta);
182 
183 static void ip_ma_put(struct ip_mc_list *im)
184 {
185 	if (refcount_dec_and_test(&im->refcnt)) {
186 		in_dev_put(im->interface);
187 		kfree_rcu(im, rcu);
188 	}
189 }
190 
191 #define pmc_dereference(e, pmc) \
192 	rcu_dereference_protected(e, lockdep_is_held(&(pmc)->lock) || \
193 				     lockdep_is_held(&(pmc)->interface->mc_tomb_lock))
194 
195 #define for_each_pmc_rcu(in_dev, pmc)				\
196 	for (pmc = rcu_dereference(in_dev->mc_list);		\
197 	     pmc != NULL;					\
198 	     pmc = rcu_dereference(pmc->next_rcu))
199 
200 #define for_each_pmc_rtnl(in_dev, pmc)				\
201 	for (pmc = rtnl_dereference(in_dev->mc_list);		\
202 	     pmc != NULL;					\
203 	     pmc = rtnl_dereference(pmc->next_rcu))
204 
205 #define for_each_psf_mclock(pmc, psf)				\
206 	for (psf = pmc_dereference((pmc)->sources, pmc);	\
207 	     psf;						\
208 	     psf = pmc_dereference(psf->sf_next, pmc))
209 
210 #define for_each_psf_rcu(im, psf)				\
211 	for (psf = rcu_dereference((im)->sources);		\
212 	     psf;						\
213 	     psf = rcu_dereference(psf->sf_next))
214 
215 #define for_each_psf_tomb(pmc, psf)				\
216 	for (psf = pmc_dereference((pmc)->tomb, pmc);		\
217 	     psf;						\
218 	     psf = pmc_dereference(psf->sf_next, pmc))
219 
220 static void ip_sf_list_clear_all(struct ip_sf_list *psf)
221 {
222 	struct ip_sf_list *next;
223 
224 	while (psf) {
225 		next = rcu_dereference_protected(psf->sf_next, 1);
226 		kfree_rcu(psf, rcu);
227 		psf = next;
228 	}
229 }
230 
231 #ifdef CONFIG_IP_MULTICAST
232 
233 /*
234  *	Timer management
235  */
236 
237 static void igmp_stop_timer(struct ip_mc_list *im)
238 {
239 	bool put = false;
240 
241 	spin_lock_bh(&im->lock);
242 	if (timer_delete(&im->timer))
243 		put = true;
244 	WRITE_ONCE(im->tm_running, 0);
245 	WRITE_ONCE(im->reporter, 0);
246 	im->unsolicit_count = 0;
247 	spin_unlock_bh(&im->lock);
248 
249 	if (put)
250 		ip_ma_put(im);
251 }
252 
253 /* It must be called with locked im->lock */
254 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
255 {
256 	int tv = get_random_u32_below(max_delay);
257 
258 	WRITE_ONCE(im->tm_running, 1);
259 	if (refcount_inc_not_zero(&im->refcnt)) {
260 		if (mod_timer(&im->timer, jiffies + tv + 2))
261 			ip_ma_put(im);
262 	}
263 }
264 
265 static void igmp_gq_start_timer(struct in_device *in_dev)
266 {
267 	int tv = get_random_u32_below(READ_ONCE(in_dev->mr_maxdelay));
268 	unsigned long exp = jiffies + tv + 2;
269 
270 	if (in_dev->mr_gq_running &&
271 	    time_after_eq(exp, (in_dev->mr_gq_timer).expires))
272 		return;
273 
274 	in_dev->mr_gq_running = 1;
275 	if (in_dev_hold_safe(in_dev)) {
276 		if (mod_timer(&in_dev->mr_gq_timer, exp))
277 			in_dev_put(in_dev);
278 	}
279 }
280 
281 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
282 {
283 	if (in_dev_hold_safe(in_dev)) {
284 		int tv = get_random_u32_below(delay);
285 
286 		if (mod_timer(&in_dev->mr_ifc_timer, jiffies + tv + 2))
287 			in_dev_put(in_dev);
288 	}
289 }
290 
291 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
292 {
293 	bool put = false;
294 
295 	spin_lock_bh(&im->lock);
296 	im->unsolicit_count = 0;
297 	if (timer_delete(&im->timer)) {
298 		if ((long)(im->timer.expires-jiffies) < max_delay) {
299 			add_timer(&im->timer);
300 			WRITE_ONCE(im->tm_running, 1);
301 			spin_unlock_bh(&im->lock);
302 			return;
303 		}
304 		put = true;
305 	}
306 	igmp_start_timer(im, max_delay);
307 	spin_unlock_bh(&im->lock);
308 
309 	if (put)
310 		ip_ma_put(im);
311 }
312 
313 
314 /*
315  *	Send an IGMP report.
316  */
317 
318 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
319 
320 
321 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
322 	int gdeleted, int sdeleted)
323 {
324 	switch (type) {
325 	case IGMPV3_MODE_IS_INCLUDE:
326 	case IGMPV3_MODE_IS_EXCLUDE:
327 		if (gdeleted || sdeleted)
328 			return 0;
329 		if (!(pmc->gsquery && !psf->sf_gsresp)) {
330 			if (pmc->sfmode == MCAST_INCLUDE)
331 				return 1;
332 			/* don't include if this source is excluded
333 			 * in all filters
334 			 */
335 			if (psf->sf_count[MCAST_INCLUDE])
336 				return type == IGMPV3_MODE_IS_INCLUDE;
337 			return pmc->sfcount[MCAST_EXCLUDE] ==
338 				psf->sf_count[MCAST_EXCLUDE];
339 		}
340 		return 0;
341 	case IGMPV3_CHANGE_TO_INCLUDE:
342 		if (gdeleted || sdeleted)
343 			return 0;
344 		return psf->sf_count[MCAST_INCLUDE] != 0;
345 	case IGMPV3_CHANGE_TO_EXCLUDE:
346 		if (gdeleted || sdeleted)
347 			return 0;
348 		if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
349 		    psf->sf_count[MCAST_INCLUDE])
350 			return 0;
351 		return pmc->sfcount[MCAST_EXCLUDE] ==
352 			psf->sf_count[MCAST_EXCLUDE];
353 	case IGMPV3_ALLOW_NEW_SOURCES:
354 		if (gdeleted || !psf->sf_crcount)
355 			return 0;
356 		return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
357 	case IGMPV3_BLOCK_OLD_SOURCES:
358 		if (pmc->sfmode == MCAST_INCLUDE)
359 			return gdeleted || (psf->sf_crcount && sdeleted);
360 		return psf->sf_crcount && !gdeleted && !sdeleted;
361 	}
362 	return 0;
363 }
364 
365 static int
366 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
367 {
368 	struct ip_sf_list *psf;
369 	int scount = 0;
370 
371 	for_each_psf_mclock(pmc, psf) {
372 		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
373 			continue;
374 		scount++;
375 	}
376 	return scount;
377 }
378 
379 /* source address selection per RFC 3376 section 4.2.13 */
380 static __be32 igmpv3_get_srcaddr(struct net_device *dev,
381 				 const struct flowi4 *fl4)
382 {
383 	struct in_device *in_dev = __in_dev_get_rcu(dev);
384 	const struct in_ifaddr *ifa;
385 
386 	if (!in_dev)
387 		return htonl(INADDR_ANY);
388 
389 	in_dev_for_each_ifa_rcu(ifa, in_dev) {
390 		if (fl4->saddr == ifa->ifa_local)
391 			return fl4->saddr;
392 	}
393 
394 	return htonl(INADDR_ANY);
395 }
396 
397 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
398 {
399 	struct sk_buff *skb;
400 	struct rtable *rt;
401 	struct iphdr *pip;
402 	struct igmpv3_report *pig;
403 	struct net *net = dev_net(dev);
404 	struct flowi4 fl4;
405 	int hlen = LL_RESERVED_SPACE(dev);
406 	int tlen = dev->needed_tailroom;
407 	unsigned int size;
408 
409 	size = min(mtu, IP_MAX_MTU);
410 	while (1) {
411 		skb = alloc_skb(size + hlen + tlen,
412 				GFP_ATOMIC | __GFP_NOWARN);
413 		if (skb)
414 			break;
415 		size >>= 1;
416 		if (size < 256)
417 			return NULL;
418 	}
419 	skb->priority = TC_PRIO_CONTROL;
420 
421 	rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
422 				   0, 0,
423 				   IPPROTO_IGMP, 0, dev->ifindex);
424 	if (IS_ERR(rt)) {
425 		kfree_skb(skb);
426 		return NULL;
427 	}
428 
429 	skb_dst_set(skb, &rt->dst);
430 	skb->dev = dev;
431 
432 	skb_reserve(skb, hlen);
433 	skb_tailroom_reserve(skb, mtu, tlen);
434 
435 	skb_reset_network_header(skb);
436 	pip = ip_hdr(skb);
437 	skb_put(skb, sizeof(struct iphdr) + 4);
438 
439 	pip->version  = 4;
440 	pip->ihl      = (sizeof(struct iphdr)+4)>>2;
441 	pip->tos      = 0xc0;
442 	pip->frag_off = htons(IP_DF);
443 	pip->ttl      = 1;
444 	pip->daddr    = fl4.daddr;
445 
446 	rcu_read_lock();
447 	pip->saddr    = igmpv3_get_srcaddr(dev, &fl4);
448 	rcu_read_unlock();
449 
450 	pip->protocol = IPPROTO_IGMP;
451 	pip->tot_len  = 0;	/* filled in later */
452 	ip_select_ident(net, skb, NULL);
453 	((u8 *)&pip[1])[0] = IPOPT_RA;
454 	((u8 *)&pip[1])[1] = 4;
455 	((u8 *)&pip[1])[2] = 0;
456 	((u8 *)&pip[1])[3] = 0;
457 
458 	skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
459 	skb_put(skb, sizeof(*pig));
460 	pig = igmpv3_report_hdr(skb);
461 	pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
462 	pig->resv1 = 0;
463 	pig->csum = 0;
464 	pig->resv2 = 0;
465 	pig->ngrec = 0;
466 	return skb;
467 }
468 
469 static int igmpv3_sendpack(struct sk_buff *skb)
470 {
471 	struct igmphdr *pig = igmp_hdr(skb);
472 	const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
473 
474 	pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
475 
476 	return ip_local_out(skb_dst_dev_net(skb), skb->sk, skb);
477 }
478 
479 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
480 {
481 	return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
482 }
483 
484 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
485 	int type, struct igmpv3_grec **ppgr, unsigned int mtu)
486 {
487 	struct net_device *dev = pmc->interface->dev;
488 	struct igmpv3_report *pih;
489 	struct igmpv3_grec *pgr;
490 
491 	if (!skb) {
492 		skb = igmpv3_newpack(dev, mtu);
493 		if (!skb)
494 			return NULL;
495 	}
496 	pgr = skb_put(skb, sizeof(struct igmpv3_grec));
497 	pgr->grec_type = type;
498 	pgr->grec_auxwords = 0;
499 	pgr->grec_nsrcs = 0;
500 	pgr->grec_mca = pmc->multiaddr;
501 	pih = igmpv3_report_hdr(skb);
502 	pih->ngrec = htons(ntohs(pih->ngrec)+1);
503 	*ppgr = pgr;
504 	return skb;
505 }
506 
507 #define AVAILABLE(skb)	((skb) ? skb_availroom(skb) : 0)
508 
509 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
510 	int type, int gdeleted, int sdeleted)
511 {
512 	struct net_device *dev = pmc->interface->dev;
513 	struct net *net = dev_net(dev);
514 	struct igmpv3_report *pih;
515 	struct igmpv3_grec *pgr = NULL;
516 	struct ip_sf_list *psf, *psf_next, *psf_prev;
517 	struct ip_sf_list __rcu **psf_list;
518 	int scount, stotal, first, isquery, truncate;
519 	unsigned int mtu;
520 
521 	if (pmc->multiaddr == IGMP_ALL_HOSTS)
522 		return skb;
523 	if (ipv4_is_local_multicast(pmc->multiaddr) &&
524 	    !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
525 		return skb;
526 
527 	mtu = READ_ONCE(dev->mtu);
528 	if (mtu < IPV4_MIN_MTU)
529 		return skb;
530 
531 	isquery = type == IGMPV3_MODE_IS_INCLUDE ||
532 		  type == IGMPV3_MODE_IS_EXCLUDE;
533 	truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
534 		    type == IGMPV3_CHANGE_TO_EXCLUDE;
535 
536 	stotal = scount = 0;
537 
538 	psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
539 
540 	if (!rcu_access_pointer(*psf_list))
541 		goto empty_source;
542 
543 	pih = skb ? igmpv3_report_hdr(skb) : NULL;
544 
545 	/* EX and TO_EX get a fresh packet, if needed */
546 	if (truncate) {
547 		if (pih && pih->ngrec &&
548 		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
549 			if (skb)
550 				igmpv3_sendpack(skb);
551 			skb = igmpv3_newpack(dev, mtu);
552 		}
553 	}
554 	first = 1;
555 	psf_prev = NULL;
556 	for (psf = pmc_dereference(*psf_list, pmc);
557 	     psf;
558 	     psf = psf_next) {
559 		__be32 *psrc;
560 
561 		psf_next = pmc_dereference(psf->sf_next, pmc);
562 
563 		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
564 			psf_prev = psf;
565 			continue;
566 		}
567 
568 		/* Based on RFC3376 5.1. Should not send source-list change
569 		 * records when there is a filter mode change.
570 		 */
571 		if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
572 		     (!gdeleted && pmc->crcount)) &&
573 		    (type == IGMPV3_ALLOW_NEW_SOURCES ||
574 		     type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
575 			goto decrease_sf_crcount;
576 
577 		/* clear marks on query responses */
578 		if (isquery)
579 			psf->sf_gsresp = 0;
580 
581 		if (AVAILABLE(skb) < sizeof(__be32) +
582 		    first*sizeof(struct igmpv3_grec)) {
583 			if (truncate && !first)
584 				break;	 /* truncate these */
585 			if (pgr)
586 				pgr->grec_nsrcs = htons(scount);
587 			if (skb)
588 				igmpv3_sendpack(skb);
589 			skb = igmpv3_newpack(dev, mtu);
590 			first = 1;
591 			scount = 0;
592 		}
593 		if (first) {
594 			skb = add_grhead(skb, pmc, type, &pgr, mtu);
595 			first = 0;
596 		}
597 		if (!skb)
598 			return NULL;
599 		psrc = skb_put(skb, sizeof(__be32));
600 		*psrc = psf->sf_inaddr;
601 		scount++; stotal++;
602 		if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
603 		     type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
604 decrease_sf_crcount:
605 			psf->sf_crcount--;
606 			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
607 				if (psf_prev)
608 					rcu_assign_pointer(psf_prev->sf_next,
609 							   psf_next);
610 				else
611 					rcu_assign_pointer(*psf_list,
612 							   psf_next);
613 				kfree_rcu(psf, rcu);
614 				continue;
615 			}
616 		}
617 		psf_prev = psf;
618 	}
619 
620 empty_source:
621 	if (!stotal) {
622 		if (type == IGMPV3_ALLOW_NEW_SOURCES ||
623 		    type == IGMPV3_BLOCK_OLD_SOURCES)
624 			return skb;
625 		if (pmc->crcount || isquery) {
626 			/* make sure we have room for group header */
627 			if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
628 				igmpv3_sendpack(skb);
629 				skb = NULL; /* add_grhead will get a new one */
630 			}
631 			skb = add_grhead(skb, pmc, type, &pgr, mtu);
632 		}
633 	}
634 	if (pgr)
635 		pgr->grec_nsrcs = htons(scount);
636 
637 	if (isquery)
638 		pmc->gsquery = 0;	/* clear query state on report */
639 	return skb;
640 }
641 
642 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
643 {
644 	struct sk_buff *skb = NULL;
645 	struct net *net = dev_net(in_dev->dev);
646 	int type;
647 
648 	if (!pmc) {
649 		rcu_read_lock();
650 		for_each_pmc_rcu(in_dev, pmc) {
651 			if (pmc->multiaddr == IGMP_ALL_HOSTS)
652 				continue;
653 			if (ipv4_is_local_multicast(pmc->multiaddr) &&
654 			    !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
655 				continue;
656 			spin_lock_bh(&pmc->lock);
657 			if (pmc->sfcount[MCAST_EXCLUDE])
658 				type = IGMPV3_MODE_IS_EXCLUDE;
659 			else
660 				type = IGMPV3_MODE_IS_INCLUDE;
661 			skb = add_grec(skb, pmc, type, 0, 0);
662 			spin_unlock_bh(&pmc->lock);
663 		}
664 		rcu_read_unlock();
665 	} else {
666 		spin_lock_bh(&pmc->lock);
667 		if (pmc->sfcount[MCAST_EXCLUDE])
668 			type = IGMPV3_MODE_IS_EXCLUDE;
669 		else
670 			type = IGMPV3_MODE_IS_INCLUDE;
671 		skb = add_grec(skb, pmc, type, 0, 0);
672 		spin_unlock_bh(&pmc->lock);
673 	}
674 	if (!skb)
675 		return 0;
676 	return igmpv3_sendpack(skb);
677 }
678 
679 /*
680  * remove zero-count source records from a source filter list
681  */
682 static void igmpv3_clear_zeros(struct ip_sf_list __rcu **ppsf)
683 {
684 	struct ip_sf_list *psf_prev, *psf_next, *psf;
685 
686 	psf_prev = NULL;
687 	for (psf = rcu_dereference_protected(*ppsf, 1); psf; psf = psf_next) {
688 		psf_next = rcu_dereference_protected(psf->sf_next, 1);
689 		if (psf->sf_crcount == 0) {
690 			if (psf_prev)
691 				rcu_assign_pointer(psf_prev->sf_next, psf_next);
692 			else
693 				rcu_assign_pointer(*ppsf, psf_next);
694 			kfree_rcu(psf, rcu);
695 		} else {
696 			psf_prev = psf;
697 		}
698 	}
699 }
700 
701 static void kfree_pmc(struct ip_mc_list *pmc)
702 {
703 	ip_sf_list_clear_all(rcu_dereference_protected(pmc->sources, 1));
704 	ip_sf_list_clear_all(rcu_dereference_protected(pmc->tomb, 1));
705 	kfree(pmc);
706 }
707 
708 static void igmpv3_send_cr(struct in_device *in_dev)
709 {
710 	struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
711 	struct sk_buff *skb = NULL;
712 	int type, dtype;
713 
714 	rcu_read_lock();
715 	spin_lock_bh(&in_dev->mc_tomb_lock);
716 
717 	/* deleted MCA's */
718 	pmc_prev = NULL;
719 	for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
720 		pmc_next = pmc->next;
721 		if (pmc->sfmode == MCAST_INCLUDE) {
722 			type = IGMPV3_BLOCK_OLD_SOURCES;
723 			dtype = IGMPV3_BLOCK_OLD_SOURCES;
724 			skb = add_grec(skb, pmc, type, 1, 0);
725 			skb = add_grec(skb, pmc, dtype, 1, 1);
726 		}
727 		if (pmc->crcount) {
728 			if (pmc->sfmode == MCAST_EXCLUDE) {
729 				type = IGMPV3_CHANGE_TO_INCLUDE;
730 				skb = add_grec(skb, pmc, type, 1, 0);
731 			}
732 			pmc->crcount--;
733 			if (pmc->crcount == 0) {
734 				igmpv3_clear_zeros(&pmc->tomb);
735 				igmpv3_clear_zeros(&pmc->sources);
736 			}
737 		}
738 		if (pmc->crcount == 0 && !rcu_access_pointer(pmc->tomb) &&
739 		    !rcu_access_pointer(pmc->sources)) {
740 			if (pmc_prev)
741 				pmc_prev->next = pmc_next;
742 			else
743 				in_dev->mc_tomb = pmc_next;
744 			in_dev_put(pmc->interface);
745 			kfree_pmc(pmc);
746 		} else
747 			pmc_prev = pmc;
748 	}
749 	spin_unlock_bh(&in_dev->mc_tomb_lock);
750 
751 	/* change recs */
752 	for_each_pmc_rcu(in_dev, pmc) {
753 		spin_lock_bh(&pmc->lock);
754 		if (pmc->sfcount[MCAST_EXCLUDE]) {
755 			type = IGMPV3_BLOCK_OLD_SOURCES;
756 			dtype = IGMPV3_ALLOW_NEW_SOURCES;
757 		} else {
758 			type = IGMPV3_ALLOW_NEW_SOURCES;
759 			dtype = IGMPV3_BLOCK_OLD_SOURCES;
760 		}
761 		skb = add_grec(skb, pmc, type, 0, 0);
762 		skb = add_grec(skb, pmc, dtype, 0, 1);	/* deleted sources */
763 
764 		/* filter mode changes */
765 		if (pmc->crcount) {
766 			if (pmc->sfmode == MCAST_EXCLUDE)
767 				type = IGMPV3_CHANGE_TO_EXCLUDE;
768 			else
769 				type = IGMPV3_CHANGE_TO_INCLUDE;
770 			skb = add_grec(skb, pmc, type, 0, 0);
771 			pmc->crcount--;
772 		}
773 		spin_unlock_bh(&pmc->lock);
774 	}
775 	rcu_read_unlock();
776 
777 	if (!skb)
778 		return;
779 	(void) igmpv3_sendpack(skb);
780 }
781 
782 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
783 	int type)
784 {
785 	struct sk_buff *skb;
786 	struct iphdr *iph;
787 	struct igmphdr *ih;
788 	struct rtable *rt;
789 	struct net_device *dev = in_dev->dev;
790 	struct net *net = dev_net(dev);
791 	__be32	group = pmc ? pmc->multiaddr : 0;
792 	struct flowi4 fl4;
793 	__be32	dst;
794 	int hlen, tlen;
795 
796 	if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
797 		return igmpv3_send_report(in_dev, pmc);
798 
799 	if (ipv4_is_local_multicast(group) &&
800 	    !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
801 		return 0;
802 
803 	if (type == IGMP_HOST_LEAVE_MESSAGE)
804 		dst = IGMP_ALL_ROUTER;
805 	else
806 		dst = group;
807 
808 	rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
809 				   0, 0,
810 				   IPPROTO_IGMP, 0, dev->ifindex);
811 	if (IS_ERR(rt))
812 		return -1;
813 
814 	hlen = LL_RESERVED_SPACE(dev);
815 	tlen = dev->needed_tailroom;
816 	skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
817 	if (!skb) {
818 		ip_rt_put(rt);
819 		return -1;
820 	}
821 	skb->priority = TC_PRIO_CONTROL;
822 
823 	skb_dst_set(skb, &rt->dst);
824 
825 	skb_reserve(skb, hlen);
826 
827 	skb_reset_network_header(skb);
828 	iph = ip_hdr(skb);
829 	skb_put(skb, sizeof(struct iphdr) + 4);
830 
831 	iph->version  = 4;
832 	iph->ihl      = (sizeof(struct iphdr)+4)>>2;
833 	iph->tos      = 0xc0;
834 	iph->frag_off = htons(IP_DF);
835 	iph->ttl      = 1;
836 	iph->daddr    = dst;
837 	iph->saddr    = fl4.saddr;
838 	iph->protocol = IPPROTO_IGMP;
839 	ip_select_ident(net, skb, NULL);
840 	((u8 *)&iph[1])[0] = IPOPT_RA;
841 	((u8 *)&iph[1])[1] = 4;
842 	((u8 *)&iph[1])[2] = 0;
843 	((u8 *)&iph[1])[3] = 0;
844 
845 	ih = skb_put(skb, sizeof(struct igmphdr));
846 	ih->type = type;
847 	ih->code = 0;
848 	ih->csum = 0;
849 	ih->group = group;
850 	ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
851 
852 	return ip_local_out(net, skb->sk, skb);
853 }
854 
855 static void igmp_gq_timer_expire(struct timer_list *t)
856 {
857 	struct in_device *in_dev = timer_container_of(in_dev, t, mr_gq_timer);
858 
859 	in_dev->mr_gq_running = 0;
860 	igmpv3_send_report(in_dev, NULL);
861 	in_dev_put(in_dev);
862 }
863 
864 static void igmp_ifc_timer_expire(struct timer_list *t)
865 {
866 	struct in_device *in_dev = timer_container_of(in_dev, t, mr_ifc_timer);
867 	u32 mr_ifc_count;
868 
869 	igmpv3_send_cr(in_dev);
870 restart:
871 	mr_ifc_count = READ_ONCE(in_dev->mr_ifc_count);
872 
873 	if (mr_ifc_count) {
874 		if (cmpxchg(&in_dev->mr_ifc_count,
875 			    mr_ifc_count,
876 			    mr_ifc_count - 1) != mr_ifc_count)
877 			goto restart;
878 		igmp_ifc_start_timer(in_dev,
879 				     unsolicited_report_interval(in_dev));
880 	}
881 	in_dev_put(in_dev);
882 }
883 
884 static void igmp_ifc_event(struct in_device *in_dev)
885 {
886 	struct net *net = dev_net(in_dev->dev);
887 	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
888 		return;
889 	WRITE_ONCE(in_dev->mr_ifc_count, in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv));
890 	igmp_ifc_start_timer(in_dev, 1);
891 }
892 
893 
894 static void igmp_timer_expire(struct timer_list *t)
895 {
896 	struct ip_mc_list *im = timer_container_of(im, t, timer);
897 	struct in_device *in_dev = im->interface;
898 
899 	spin_lock(&im->lock);
900 	WRITE_ONCE(im->tm_running, 0);
901 
902 	if (im->unsolicit_count && --im->unsolicit_count)
903 		igmp_start_timer(im, unsolicited_report_interval(in_dev));
904 
905 	WRITE_ONCE(im->reporter, 1);
906 	spin_unlock(&im->lock);
907 
908 	if (IGMP_V1_SEEN(in_dev))
909 		igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
910 	else if (IGMP_V2_SEEN(in_dev))
911 		igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
912 	else
913 		igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
914 
915 	ip_ma_put(im);
916 }
917 
918 /* mark EXCLUDE-mode sources */
919 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
920 {
921 	struct ip_sf_list *psf;
922 	int i, scount;
923 
924 	scount = 0;
925 	for_each_psf_mclock(pmc, psf) {
926 		if (scount == nsrcs)
927 			break;
928 		for (i = 0; i < nsrcs; i++) {
929 			/* skip inactive filters */
930 			if (psf->sf_count[MCAST_INCLUDE] ||
931 			    pmc->sfcount[MCAST_EXCLUDE] !=
932 			    psf->sf_count[MCAST_EXCLUDE])
933 				break;
934 			if (srcs[i] == psf->sf_inaddr) {
935 				scount++;
936 				break;
937 			}
938 		}
939 	}
940 	pmc->gsquery = 0;
941 	if (scount == nsrcs)	/* all sources excluded */
942 		return 0;
943 	return 1;
944 }
945 
946 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
947 {
948 	struct ip_sf_list *psf;
949 	int i, scount;
950 
951 	if (pmc->sfmode == MCAST_EXCLUDE)
952 		return igmp_xmarksources(pmc, nsrcs, srcs);
953 
954 	/* mark INCLUDE-mode sources */
955 	scount = 0;
956 	for_each_psf_mclock(pmc, psf) {
957 		if (scount == nsrcs)
958 			break;
959 		for (i = 0; i < nsrcs; i++)
960 			if (srcs[i] == psf->sf_inaddr) {
961 				psf->sf_gsresp = 1;
962 				scount++;
963 				break;
964 			}
965 	}
966 	if (!scount) {
967 		pmc->gsquery = 0;
968 		return 0;
969 	}
970 	pmc->gsquery = 1;
971 	return 1;
972 }
973 
974 /* return true if packet was dropped */
975 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
976 {
977 	struct ip_mc_list *im;
978 	struct net *net = dev_net(in_dev->dev);
979 
980 	/* Timers are only set for non-local groups */
981 
982 	if (group == IGMP_ALL_HOSTS)
983 		return false;
984 	if (ipv4_is_local_multicast(group) &&
985 	    !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
986 		return false;
987 
988 	rcu_read_lock();
989 	for_each_pmc_rcu(in_dev, im) {
990 		if (im->multiaddr == group) {
991 			igmp_stop_timer(im);
992 			break;
993 		}
994 	}
995 	rcu_read_unlock();
996 	return false;
997 }
998 
999 /* return true if packet was dropped */
1000 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
1001 	int len)
1002 {
1003 	struct igmphdr 		*ih = igmp_hdr(skb);
1004 	struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
1005 	struct ip_mc_list	*im;
1006 	__be32			group = ih->group;
1007 	int			max_delay;
1008 	int			mark = 0;
1009 	struct net		*net = dev_net(in_dev->dev);
1010 	unsigned long seen;
1011 
1012 	if (len == 8) {
1013 		seen = jiffies + READ_ONCE(in_dev->mr_qrv) * READ_ONCE(in_dev->mr_qi) +
1014 		       READ_ONCE(in_dev->mr_qri);
1015 		if (ih->code == 0) {
1016 			/* Alas, old v1 router presents here. */
1017 
1018 			max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
1019 			WRITE_ONCE(in_dev->mr_v1_seen, seen);
1020 			group = 0;
1021 		} else {
1022 			/* v2 router present */
1023 			max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
1024 			WRITE_ONCE(in_dev->mr_v2_seen, seen);
1025 		}
1026 		/* cancel the interface change timer */
1027 		WRITE_ONCE(in_dev->mr_ifc_count, 0);
1028 		if (timer_delete(&in_dev->mr_ifc_timer))
1029 			__in_dev_put(in_dev);
1030 		/* clear deleted report items */
1031 		igmpv3_clear_delrec(in_dev);
1032 	} else if (len < 12) {
1033 		return true;	/* ignore bogus packet; freed by caller */
1034 	} else if (IGMP_V1_SEEN(in_dev)) {
1035 		/* This is a v3 query with v1 queriers present */
1036 		max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
1037 		group = 0;
1038 	} else if (IGMP_V2_SEEN(in_dev)) {
1039 		/* this is a v3 query with v2 queriers present;
1040 		 * Interpretation of the max_delay code is problematic here.
1041 		 * A real v2 host would use ih_code directly, while v3 has a
1042 		 * different encoding. We use the v3 encoding as more likely
1043 		 * to be intended in a v3 query.
1044 		 */
1045 		max_delay = igmpv3_mrt(ih3) * (HZ / IGMP_TIMER_SCALE);
1046 		if (!max_delay)
1047 			max_delay = 1;	/* can't mod w/ 0 */
1048 	} else { /* v3 */
1049 		unsigned long mr_qi;
1050 
1051 		if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
1052 			return true;
1053 
1054 		ih3 = igmpv3_query_hdr(skb);
1055 		if (ih3->nsrcs) {
1056 			if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
1057 					   + ntohs(ih3->nsrcs)*sizeof(__be32)))
1058 				return true;
1059 			ih3 = igmpv3_query_hdr(skb);
1060 		}
1061 
1062 		max_delay = igmpv3_mrt(ih3) * (HZ / IGMP_TIMER_SCALE);
1063 		if (!max_delay)
1064 			max_delay = 1;	/* can't mod w/ 0 */
1065 		WRITE_ONCE(in_dev->mr_maxdelay, max_delay);
1066 
1067 		/* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently
1068 		 * received value was zero, use the default or statically
1069 		 * configured value.
1070 		 */
1071 		WRITE_ONCE(in_dev->mr_qrv,
1072 			   ih3->qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv));
1073 		mr_qi = igmpv3_qqi(ih3) * HZ ? : IGMP_QUERY_INTERVAL;
1074 		WRITE_ONCE(in_dev->mr_qi, mr_qi);
1075 		/* RFC3376, 8.3. Query Response Interval:
1076 		 * The number of seconds represented by the [Query Response
1077 		 * Interval] must be less than the [Query Interval].
1078 		 */
1079 		if (READ_ONCE(in_dev->mr_qri) >= mr_qi)
1080 			WRITE_ONCE(in_dev->mr_qri, (mr_qi/HZ - 1) * HZ);
1081 
1082 		if (!group) { /* general query */
1083 			if (ih3->nsrcs)
1084 				return true;	/* no sources allowed */
1085 			igmp_gq_start_timer(in_dev);
1086 			return false;
1087 		}
1088 		/* mark sources to include, if group & source-specific */
1089 		mark = ih3->nsrcs != 0;
1090 	}
1091 
1092 	/*
1093 	 * - Start the timers in all of our membership records
1094 	 *   that the query applies to for the interface on
1095 	 *   which the query arrived excl. those that belong
1096 	 *   to a "local" group (224.0.0.X)
1097 	 * - For timers already running check if they need to
1098 	 *   be reset.
1099 	 * - Use the igmp->igmp_code field as the maximum
1100 	 *   delay possible
1101 	 */
1102 	rcu_read_lock();
1103 	for_each_pmc_rcu(in_dev, im) {
1104 		int changed;
1105 
1106 		if (group && group != im->multiaddr)
1107 			continue;
1108 		if (im->multiaddr == IGMP_ALL_HOSTS)
1109 			continue;
1110 		if (ipv4_is_local_multicast(im->multiaddr) &&
1111 		    !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1112 			continue;
1113 		spin_lock_bh(&im->lock);
1114 		if (im->tm_running)
1115 			im->gsquery = im->gsquery && mark;
1116 		else
1117 			im->gsquery = mark;
1118 		changed = !im->gsquery ||
1119 			igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1120 		spin_unlock_bh(&im->lock);
1121 		if (changed)
1122 			igmp_mod_timer(im, max_delay);
1123 	}
1124 	rcu_read_unlock();
1125 	return false;
1126 }
1127 
1128 /* called in rcu_read_lock() section */
1129 int igmp_rcv(struct sk_buff *skb)
1130 {
1131 	/* This basically follows the spec line by line -- see RFC1112 */
1132 	struct igmphdr *ih;
1133 	struct net_device *dev = skb->dev;
1134 	struct in_device *in_dev;
1135 	int len = skb->len;
1136 	bool dropped = true;
1137 
1138 	if (netif_is_l3_master(dev)) {
1139 		dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
1140 		if (!dev)
1141 			goto drop;
1142 	}
1143 
1144 	in_dev = __in_dev_get_rcu(dev);
1145 	if (!in_dev)
1146 		goto drop;
1147 
1148 	if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1149 		goto drop;
1150 
1151 	if (skb_checksum_simple_validate(skb))
1152 		goto drop;
1153 
1154 	ih = igmp_hdr(skb);
1155 	switch (ih->type) {
1156 	case IGMP_HOST_MEMBERSHIP_QUERY:
1157 		dropped = igmp_heard_query(in_dev, skb, len);
1158 		break;
1159 	case IGMP_HOST_MEMBERSHIP_REPORT:
1160 	case IGMPV2_HOST_MEMBERSHIP_REPORT:
1161 		/* Is it our report looped back? */
1162 		if (rt_is_output_route(skb_rtable(skb)))
1163 			break;
1164 		/* don't rely on MC router hearing unicast reports */
1165 		if (skb->pkt_type == PACKET_MULTICAST ||
1166 		    skb->pkt_type == PACKET_BROADCAST)
1167 			dropped = igmp_heard_report(in_dev, ih->group);
1168 		break;
1169 	case IGMP_PIM:
1170 #ifdef CONFIG_IP_PIMSM_V1
1171 		return pim_rcv_v1(skb);
1172 #endif
1173 	case IGMPV3_HOST_MEMBERSHIP_REPORT:
1174 	case IGMP_DVMRP:
1175 	case IGMP_TRACE:
1176 	case IGMP_HOST_LEAVE_MESSAGE:
1177 	case IGMP_MTRACE:
1178 	case IGMP_MTRACE_RESP:
1179 		break;
1180 	default:
1181 		break;
1182 	}
1183 
1184 drop:
1185 	if (dropped)
1186 		kfree_skb(skb);
1187 	else
1188 		consume_skb(skb);
1189 	return 0;
1190 }
1191 
1192 #endif
1193 
1194 
1195 /*
1196  *	Add a filter to a device
1197  */
1198 
1199 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1200 {
1201 	char buf[MAX_ADDR_LEN];
1202 	struct net_device *dev = in_dev->dev;
1203 
1204 	/* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1205 	   We will get multicast token leakage, when IFF_MULTICAST
1206 	   is changed. This check should be done in ndo_set_rx_mode
1207 	   routine. Something sort of:
1208 	   if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1209 	   --ANK
1210 	   */
1211 	if (arp_mc_map(addr, buf, dev, 0) == 0)
1212 		dev_mc_add(dev, buf);
1213 }
1214 
1215 /*
1216  *	Remove a filter from a device
1217  */
1218 
1219 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1220 {
1221 	char buf[MAX_ADDR_LEN];
1222 	struct net_device *dev = in_dev->dev;
1223 
1224 	if (arp_mc_map(addr, buf, dev, 0) == 0)
1225 		dev_mc_del(dev, buf);
1226 }
1227 
1228 #ifdef CONFIG_IP_MULTICAST
1229 /*
1230  * deleted ip_mc_list manipulation
1231  */
1232 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
1233 			      gfp_t gfp)
1234 {
1235 	struct ip_mc_list *pmc;
1236 	struct net *net = dev_net(in_dev->dev);
1237 
1238 	/* this is an "ip_mc_list" for convenience; only the fields below
1239 	 * are actually used. In particular, the refcnt and users are not
1240 	 * used for management of the delete list. Using the same structure
1241 	 * for deleted items allows change reports to use common code with
1242 	 * non-deleted or query-response MCA's.
1243 	 */
1244 	pmc = kzalloc_obj(*pmc, gfp);
1245 	if (!pmc)
1246 		return;
1247 	spin_lock_init(&pmc->lock);
1248 	spin_lock_bh(&im->lock);
1249 	pmc->interface = im->interface;
1250 	in_dev_hold(in_dev);
1251 	pmc->multiaddr = im->multiaddr;
1252 	pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1253 	pmc->sfmode = im->sfmode;
1254 	if (pmc->sfmode == MCAST_INCLUDE) {
1255 		struct ip_sf_list *psf;
1256 
1257 		for_each_psf_mclock(im, psf)
1258 			psf->sf_crcount = pmc->crcount;
1259 		pmc->tomb = im->tomb;
1260 		pmc->sources = im->sources;
1261 		RCU_INIT_POINTER(im->tomb, NULL);
1262 		RCU_INIT_POINTER(im->sources, NULL);
1263 	}
1264 	spin_unlock_bh(&im->lock);
1265 
1266 	spin_lock_bh(&in_dev->mc_tomb_lock);
1267 	pmc->next = in_dev->mc_tomb;
1268 	in_dev->mc_tomb = pmc;
1269 	spin_unlock_bh(&in_dev->mc_tomb_lock);
1270 }
1271 
1272 /*
1273  * restore ip_mc_list deleted records
1274  */
1275 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1276 {
1277 	struct ip_mc_list *pmc, *pmc_prev;
1278 	struct ip_sf_list *psf;
1279 	struct net *net = dev_net(in_dev->dev);
1280 	__be32 multiaddr = im->multiaddr;
1281 
1282 	spin_lock_bh(&in_dev->mc_tomb_lock);
1283 	pmc_prev = NULL;
1284 	for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1285 		if (pmc->multiaddr == multiaddr)
1286 			break;
1287 		pmc_prev = pmc;
1288 	}
1289 	if (pmc) {
1290 		if (pmc_prev)
1291 			pmc_prev->next = pmc->next;
1292 		else
1293 			in_dev->mc_tomb = pmc->next;
1294 	}
1295 	spin_unlock_bh(&in_dev->mc_tomb_lock);
1296 
1297 	spin_lock_bh(&im->lock);
1298 	if (pmc) {
1299 		im->interface = pmc->interface;
1300 		if (im->sfmode == MCAST_INCLUDE) {
1301 			struct ip_sf_list *sources, *tomb;
1302 
1303 			tomb = rcu_replace_pointer(im->tomb,
1304 						   rcu_dereference_protected(pmc->tomb, 1),
1305 						   lockdep_is_held(&im->lock));
1306 			rcu_assign_pointer(pmc->tomb, tomb);
1307 
1308 			sources = rcu_replace_pointer(im->sources,
1309 						      rcu_dereference_protected(pmc->sources, 1),
1310 						      lockdep_is_held(&im->lock));
1311 			rcu_assign_pointer(pmc->sources, sources);
1312 			for_each_psf_mclock(im, psf)
1313 				psf->sf_crcount = in_dev->mr_qrv ?:
1314 					READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1315 		} else {
1316 			im->crcount = in_dev->mr_qrv ?:
1317 				READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1318 		}
1319 		in_dev_put(pmc->interface);
1320 		kfree_pmc(pmc);
1321 	}
1322 	spin_unlock_bh(&im->lock);
1323 }
1324 
1325 /*
1326  * flush ip_mc_list deleted records
1327  */
1328 static void igmpv3_clear_delrec(struct in_device *in_dev)
1329 {
1330 	struct ip_mc_list *pmc, *nextpmc;
1331 
1332 	spin_lock_bh(&in_dev->mc_tomb_lock);
1333 	pmc = in_dev->mc_tomb;
1334 	in_dev->mc_tomb = NULL;
1335 	spin_unlock_bh(&in_dev->mc_tomb_lock);
1336 
1337 	for (; pmc; pmc = nextpmc) {
1338 		nextpmc = pmc->next;
1339 		ip_mc_clear_src(pmc);
1340 		in_dev_put(pmc->interface);
1341 		kfree_pmc(pmc);
1342 	}
1343 	/* clear dead sources, too */
1344 	rcu_read_lock();
1345 	for_each_pmc_rcu(in_dev, pmc) {
1346 		struct ip_sf_list *psf;
1347 
1348 		spin_lock_bh(&pmc->lock);
1349 		psf = pmc_dereference(pmc->tomb, pmc);
1350 		RCU_INIT_POINTER(pmc->tomb, NULL);
1351 		spin_unlock_bh(&pmc->lock);
1352 		ip_sf_list_clear_all(psf);
1353 	}
1354 	rcu_read_unlock();
1355 }
1356 #endif
1357 
1358 static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp)
1359 {
1360 	struct in_device *in_dev = im->interface;
1361 #ifdef CONFIG_IP_MULTICAST
1362 	struct net *net = dev_net(in_dev->dev);
1363 	int reporter;
1364 #endif
1365 
1366 	if (im->loaded) {
1367 		im->loaded = 0;
1368 		ip_mc_filter_del(in_dev, im->multiaddr);
1369 	}
1370 
1371 #ifdef CONFIG_IP_MULTICAST
1372 	if (im->multiaddr == IGMP_ALL_HOSTS)
1373 		return;
1374 	if (ipv4_is_local_multicast(im->multiaddr) &&
1375 	    !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1376 		return;
1377 
1378 	reporter = READ_ONCE(im->reporter);
1379 	igmp_stop_timer(im);
1380 
1381 	if (!in_dev->dead) {
1382 		if (IGMP_V1_SEEN(in_dev))
1383 			return;
1384 		if (IGMP_V2_SEEN(in_dev)) {
1385 			if (reporter)
1386 				igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1387 			return;
1388 		}
1389 		/* IGMPv3 */
1390 		igmpv3_add_delrec(in_dev, im, gfp);
1391 
1392 		igmp_ifc_event(in_dev);
1393 	}
1394 #endif
1395 }
1396 
1397 static void igmp_group_dropped(struct ip_mc_list *im)
1398 {
1399 	__igmp_group_dropped(im, GFP_KERNEL);
1400 }
1401 
1402 static void igmp_group_added(struct ip_mc_list *im)
1403 {
1404 	struct in_device *in_dev = im->interface;
1405 #ifdef CONFIG_IP_MULTICAST
1406 	struct net *net = dev_net(in_dev->dev);
1407 #endif
1408 
1409 	if (im->loaded == 0) {
1410 		im->loaded = 1;
1411 		ip_mc_filter_add(in_dev, im->multiaddr);
1412 	}
1413 
1414 #ifdef CONFIG_IP_MULTICAST
1415 	if (im->multiaddr == IGMP_ALL_HOSTS)
1416 		return;
1417 	if (ipv4_is_local_multicast(im->multiaddr) &&
1418 	    !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1419 		return;
1420 
1421 	if (in_dev->dead)
1422 		return;
1423 
1424 	im->unsolicit_count = READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1425 	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1426 		spin_lock_bh(&im->lock);
1427 		igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1428 		spin_unlock_bh(&im->lock);
1429 		return;
1430 	}
1431 	/* else, v3 */
1432 
1433 	/* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should
1434 	 * not send filter-mode change record as the mode should be from
1435 	 * IN() to IN(A).
1436 	 */
1437 	if (im->sfmode == MCAST_EXCLUDE)
1438 		im->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1439 
1440 	igmp_ifc_event(in_dev);
1441 #endif
1442 }
1443 
1444 
1445 /*
1446  *	Multicast list managers
1447  */
1448 
1449 static u32 ip_mc_hash(const struct ip_mc_list *im)
1450 {
1451 	return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1452 }
1453 
1454 static void ip_mc_hash_add(struct in_device *in_dev,
1455 			   struct ip_mc_list *im)
1456 {
1457 	struct ip_mc_list __rcu **mc_hash;
1458 	u32 hash;
1459 
1460 	mc_hash = rtnl_dereference(in_dev->mc_hash);
1461 	if (mc_hash) {
1462 		hash = ip_mc_hash(im);
1463 		im->next_hash = mc_hash[hash];
1464 		rcu_assign_pointer(mc_hash[hash], im);
1465 		return;
1466 	}
1467 
1468 	/* do not use a hash table for small number of items */
1469 	if (in_dev->mc_count < 4)
1470 		return;
1471 
1472 	mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1473 			  GFP_KERNEL);
1474 	if (!mc_hash)
1475 		return;
1476 
1477 	for_each_pmc_rtnl(in_dev, im) {
1478 		hash = ip_mc_hash(im);
1479 		im->next_hash = mc_hash[hash];
1480 		RCU_INIT_POINTER(mc_hash[hash], im);
1481 	}
1482 
1483 	rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1484 }
1485 
1486 static void ip_mc_hash_remove(struct in_device *in_dev,
1487 			      struct ip_mc_list *im)
1488 {
1489 	struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1490 	struct ip_mc_list *aux;
1491 
1492 	if (!mc_hash)
1493 		return;
1494 	mc_hash += ip_mc_hash(im);
1495 	while ((aux = rtnl_dereference(*mc_hash)) != im)
1496 		mc_hash = &aux->next_hash;
1497 	*mc_hash = im->next_hash;
1498 }
1499 
1500 int inet_fill_ifmcaddr(struct sk_buff *skb, struct net_device *dev,
1501 		       const struct ip_mc_list *im,
1502 		       struct inet_fill_args *args)
1503 {
1504 	struct ifa_cacheinfo ci;
1505 	struct ifaddrmsg *ifm;
1506 	struct nlmsghdr *nlh;
1507 
1508 	nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
1509 			sizeof(struct ifaddrmsg), args->flags);
1510 	if (!nlh)
1511 		return -EMSGSIZE;
1512 
1513 	ifm = nlmsg_data(nlh);
1514 	ifm->ifa_family = AF_INET;
1515 	ifm->ifa_prefixlen = 32;
1516 	ifm->ifa_flags = IFA_F_PERMANENT;
1517 	ifm->ifa_scope = RT_SCOPE_UNIVERSE;
1518 	ifm->ifa_index = dev->ifindex;
1519 
1520 	ci.cstamp = (READ_ONCE(im->mca_cstamp) - INITIAL_JIFFIES) * 100UL / HZ;
1521 	ci.tstamp = ci.cstamp;
1522 	ci.ifa_prefered = INFINITY_LIFE_TIME;
1523 	ci.ifa_valid = INFINITY_LIFE_TIME;
1524 
1525 	if (nla_put_in_addr(skb, IFA_MULTICAST, im->multiaddr) < 0 ||
1526 	    nla_put_u32(skb, IFA_MC_USERS, READ_ONCE(im->users)) < 0 ||
1527 	    nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci) < 0) {
1528 		nlmsg_cancel(skb, nlh);
1529 		return -EMSGSIZE;
1530 	}
1531 
1532 	nlmsg_end(skb, nlh);
1533 	return 0;
1534 }
1535 
1536 static void inet_ifmcaddr_notify(struct net_device *dev,
1537 				 const struct ip_mc_list *im, int event)
1538 {
1539 	struct inet_fill_args fillargs = {
1540 		.event = event,
1541 	};
1542 	struct net *net = dev_net(dev);
1543 	struct sk_buff *skb;
1544 	int err = -ENOMEM;
1545 
1546 	skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
1547 			nla_total_size(sizeof(__be32)) +
1548 			nla_total_size(sizeof(u32)) +
1549 			nla_total_size(sizeof(struct ifa_cacheinfo)),
1550 			GFP_KERNEL);
1551 	if (!skb)
1552 		goto error;
1553 
1554 	err = inet_fill_ifmcaddr(skb, dev, im, &fillargs);
1555 	if (err < 0) {
1556 		WARN_ON_ONCE(err == -EMSGSIZE);
1557 		nlmsg_free(skb);
1558 		goto error;
1559 	}
1560 
1561 	rtnl_notify(skb, net, 0, RTNLGRP_IPV4_MCADDR, NULL, GFP_KERNEL);
1562 	return;
1563 error:
1564 	rtnl_set_sk_err(net, RTNLGRP_IPV4_MCADDR, err);
1565 }
1566 
1567 /*
1568  *	A socket has joined a multicast group on device dev.
1569  */
1570 static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
1571 				unsigned int mode, gfp_t gfp)
1572 {
1573 	struct ip_mc_list __rcu **mc_hash;
1574 	struct ip_mc_list *im;
1575 
1576 	ASSERT_RTNL();
1577 
1578 	mc_hash = rtnl_dereference(in_dev->mc_hash);
1579 	if (mc_hash) {
1580 		u32 hash = hash_32((__force u32)addr, MC_HASH_SZ_LOG);
1581 
1582 		for (im = rtnl_dereference(mc_hash[hash]);
1583 		     im;
1584 		     im = rtnl_dereference(im->next_hash)) {
1585 			if (im->multiaddr == addr)
1586 				break;
1587 		}
1588 	} else {
1589 		for_each_pmc_rtnl(in_dev, im) {
1590 			if (im->multiaddr == addr)
1591 				break;
1592 		}
1593 	}
1594 
1595 	if  (im) {
1596 		WRITE_ONCE(im->users, im->users + 1);
1597 		ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0);
1598 		goto out;
1599 	}
1600 
1601 	im = kzalloc_obj(*im, gfp);
1602 	if (!im)
1603 		goto out;
1604 
1605 	WRITE_ONCE(im->users, 1);
1606 	im->interface = in_dev;
1607 	in_dev_hold(in_dev);
1608 	im->multiaddr = addr;
1609 	im->mca_cstamp = jiffies;
1610 	im->mca_tstamp = im->mca_cstamp;
1611 	/* initial mode is (EX, empty) */
1612 	im->sfmode = mode;
1613 	im->sfcount[mode] = 1;
1614 	refcount_set(&im->refcnt, 1);
1615 	spin_lock_init(&im->lock);
1616 #ifdef CONFIG_IP_MULTICAST
1617 	timer_setup(&im->timer, igmp_timer_expire, 0);
1618 #endif
1619 
1620 	im->next_rcu = in_dev->mc_list;
1621 	WRITE_ONCE(in_dev->mc_count, in_dev->mc_count + 1);
1622 	rcu_assign_pointer(in_dev->mc_list, im);
1623 
1624 	ip_mc_hash_add(in_dev, im);
1625 
1626 #ifdef CONFIG_IP_MULTICAST
1627 	igmpv3_del_delrec(in_dev, im);
1628 #endif
1629 	igmp_group_added(im);
1630 	inet_ifmcaddr_notify(in_dev->dev, im, RTM_NEWMULTICAST);
1631 	if (!in_dev->dead)
1632 		ip_rt_multicast_event(in_dev);
1633 out:
1634 	return;
1635 }
1636 
1637 void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1638 {
1639 	____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp);
1640 }
1641 EXPORT_SYMBOL(__ip_mc_inc_group);
1642 
1643 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1644 {
1645 	__ip_mc_inc_group(in_dev, addr, GFP_KERNEL);
1646 }
1647 EXPORT_SYMBOL(ip_mc_inc_group);
1648 
1649 static int ip_mc_check_iphdr(struct sk_buff *skb)
1650 {
1651 	const struct iphdr *iph;
1652 	unsigned int len;
1653 	unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1654 
1655 	if (!pskb_may_pull(skb, offset))
1656 		return -EINVAL;
1657 
1658 	iph = ip_hdr(skb);
1659 
1660 	if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1661 		return -EINVAL;
1662 
1663 	offset += ip_hdrlen(skb) - sizeof(*iph);
1664 
1665 	if (!pskb_may_pull(skb, offset))
1666 		return -EINVAL;
1667 
1668 	iph = ip_hdr(skb);
1669 
1670 	if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1671 		return -EINVAL;
1672 
1673 	len = skb_network_offset(skb) + ntohs(iph->tot_len);
1674 	if (skb->len < len || len < offset)
1675 		return -EINVAL;
1676 
1677 	skb_set_transport_header(skb, offset);
1678 
1679 	return 0;
1680 }
1681 
1682 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1683 {
1684 	unsigned int len = skb_transport_offset(skb);
1685 
1686 	len += sizeof(struct igmpv3_report);
1687 
1688 	return ip_mc_may_pull(skb, len) ? 0 : -EINVAL;
1689 }
1690 
1691 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1692 {
1693 	unsigned int transport_len = ip_transport_len(skb);
1694 	unsigned int len;
1695 
1696 	/* IGMPv{1,2}? */
1697 	if (transport_len != sizeof(struct igmphdr)) {
1698 		/* or IGMPv3? */
1699 		if (transport_len < sizeof(struct igmpv3_query))
1700 			return -EINVAL;
1701 
1702 		len = skb_transport_offset(skb) + sizeof(struct igmpv3_query);
1703 		if (!ip_mc_may_pull(skb, len))
1704 			return -EINVAL;
1705 	}
1706 
1707 	/* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1708 	 * all-systems destination addresses (224.0.0.1) for general queries
1709 	 */
1710 	if (!igmp_hdr(skb)->group &&
1711 	    ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1712 		return -EINVAL;
1713 
1714 	return 0;
1715 }
1716 
1717 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1718 {
1719 	switch (igmp_hdr(skb)->type) {
1720 	case IGMP_HOST_LEAVE_MESSAGE:
1721 	case IGMP_HOST_MEMBERSHIP_REPORT:
1722 	case IGMPV2_HOST_MEMBERSHIP_REPORT:
1723 		return 0;
1724 	case IGMPV3_HOST_MEMBERSHIP_REPORT:
1725 		return ip_mc_check_igmp_reportv3(skb);
1726 	case IGMP_HOST_MEMBERSHIP_QUERY:
1727 		return ip_mc_check_igmp_query(skb);
1728 	default:
1729 		return -ENOMSG;
1730 	}
1731 }
1732 
1733 static __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1734 {
1735 	return skb_checksum_simple_validate(skb);
1736 }
1737 
1738 static int ip_mc_check_igmp_csum(struct sk_buff *skb)
1739 {
1740 	unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1741 	unsigned int transport_len = ip_transport_len(skb);
1742 	struct sk_buff *skb_chk;
1743 
1744 	if (!ip_mc_may_pull(skb, len))
1745 		return -EINVAL;
1746 
1747 	skb_chk = skb_checksum_trimmed(skb, transport_len,
1748 				       ip_mc_validate_checksum);
1749 	if (!skb_chk)
1750 		return -EINVAL;
1751 
1752 	if (skb_chk != skb)
1753 		kfree_skb(skb_chk);
1754 
1755 	return 0;
1756 }
1757 
1758 /**
1759  * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1760  * @skb: the skb to validate
1761  *
1762  * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1763  * skb transport header accordingly and returns zero.
1764  *
1765  * -EINVAL: A broken packet was detected, i.e. it violates some internet
1766  *  standard
1767  * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1768  * -ENOMEM: A memory allocation failure happened.
1769  *
1770  * Caller needs to set the skb network header and free any returned skb if it
1771  * differs from the provided skb.
1772  */
1773 int ip_mc_check_igmp(struct sk_buff *skb)
1774 {
1775 	int ret = ip_mc_check_iphdr(skb);
1776 
1777 	if (ret < 0)
1778 		return ret;
1779 
1780 	if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1781 		return -ENOMSG;
1782 
1783 	ret = ip_mc_check_igmp_csum(skb);
1784 	if (ret < 0)
1785 		return ret;
1786 
1787 	return ip_mc_check_igmp_msg(skb);
1788 }
1789 EXPORT_SYMBOL(ip_mc_check_igmp);
1790 
1791 /*
1792  *	Resend IGMP JOIN report; used by netdev notifier.
1793  */
1794 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1795 {
1796 #ifdef CONFIG_IP_MULTICAST
1797 	struct ip_mc_list *im;
1798 	int type;
1799 	struct net *net = dev_net(in_dev->dev);
1800 
1801 	ASSERT_RTNL();
1802 
1803 	for_each_pmc_rtnl(in_dev, im) {
1804 		if (im->multiaddr == IGMP_ALL_HOSTS)
1805 			continue;
1806 		if (ipv4_is_local_multicast(im->multiaddr) &&
1807 		    !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1808 			continue;
1809 
1810 		/* a failover is happening and switches
1811 		 * must be notified immediately
1812 		 */
1813 		if (IGMP_V1_SEEN(in_dev))
1814 			type = IGMP_HOST_MEMBERSHIP_REPORT;
1815 		else if (IGMP_V2_SEEN(in_dev))
1816 			type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1817 		else
1818 			type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1819 		igmp_send_report(in_dev, im, type);
1820 	}
1821 #endif
1822 }
1823 
1824 /*
1825  *	A socket has left a multicast group on device dev
1826  */
1827 
1828 void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1829 {
1830 	struct ip_mc_list *i;
1831 	struct ip_mc_list __rcu **ip;
1832 
1833 	ASSERT_RTNL();
1834 
1835 	for (ip = &in_dev->mc_list;
1836 	     (i = rtnl_dereference(*ip)) != NULL;
1837 	     ip = &i->next_rcu) {
1838 		if (i->multiaddr == addr) {
1839 			int new_users = i->users - 1;
1840 
1841 			WRITE_ONCE(i->users, new_users);
1842 			if (new_users == 0) {
1843 				ip_mc_hash_remove(in_dev, i);
1844 				*ip = i->next_rcu;
1845 				WRITE_ONCE(in_dev->mc_count,
1846 					   in_dev->mc_count - 1);
1847 				__igmp_group_dropped(i, gfp);
1848 				inet_ifmcaddr_notify(in_dev->dev, i,
1849 						     RTM_DELMULTICAST);
1850 				ip_mc_clear_src(i);
1851 
1852 				if (!in_dev->dead)
1853 					ip_rt_multicast_event(in_dev);
1854 
1855 				ip_ma_put(i);
1856 				return;
1857 			}
1858 			break;
1859 		}
1860 	}
1861 }
1862 EXPORT_SYMBOL(__ip_mc_dec_group);
1863 
1864 /* Device changing type */
1865 
1866 void ip_mc_unmap(struct in_device *in_dev)
1867 {
1868 	struct ip_mc_list *pmc;
1869 
1870 	ASSERT_RTNL();
1871 
1872 	for_each_pmc_rtnl(in_dev, pmc)
1873 		igmp_group_dropped(pmc);
1874 }
1875 
1876 void ip_mc_remap(struct in_device *in_dev)
1877 {
1878 	struct ip_mc_list *pmc;
1879 
1880 	ASSERT_RTNL();
1881 
1882 	for_each_pmc_rtnl(in_dev, pmc) {
1883 #ifdef CONFIG_IP_MULTICAST
1884 		igmpv3_del_delrec(in_dev, pmc);
1885 #endif
1886 		igmp_group_added(pmc);
1887 	}
1888 }
1889 
1890 /* Device going down */
1891 
1892 void ip_mc_down(struct in_device *in_dev)
1893 {
1894 	struct ip_mc_list *pmc;
1895 
1896 	ASSERT_RTNL();
1897 
1898 	for_each_pmc_rtnl(in_dev, pmc)
1899 		igmp_group_dropped(pmc);
1900 
1901 #ifdef CONFIG_IP_MULTICAST
1902 	WRITE_ONCE(in_dev->mr_ifc_count, 0);
1903 	if (timer_delete(&in_dev->mr_ifc_timer))
1904 		__in_dev_put(in_dev);
1905 	in_dev->mr_gq_running = 0;
1906 	if (timer_delete(&in_dev->mr_gq_timer))
1907 		__in_dev_put(in_dev);
1908 #endif
1909 
1910 	ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1911 }
1912 
1913 #ifdef CONFIG_IP_MULTICAST
1914 static void ip_mc_reset(struct in_device *in_dev)
1915 {
1916 	struct net *net = dev_net(in_dev->dev);
1917 
1918 	in_dev->mr_qi = IGMP_QUERY_INTERVAL;
1919 	in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL;
1920 	in_dev->mr_qrv = READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1921 }
1922 #else
1923 static void ip_mc_reset(struct in_device *in_dev)
1924 {
1925 }
1926 #endif
1927 
1928 void ip_mc_init_dev(struct in_device *in_dev)
1929 {
1930 	ASSERT_RTNL();
1931 
1932 #ifdef CONFIG_IP_MULTICAST
1933 	timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0);
1934 	timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0);
1935 #endif
1936 	ip_mc_reset(in_dev);
1937 
1938 	spin_lock_init(&in_dev->mc_tomb_lock);
1939 }
1940 
1941 /* Device going up */
1942 
1943 void ip_mc_up(struct in_device *in_dev)
1944 {
1945 	struct ip_mc_list *pmc;
1946 
1947 	ASSERT_RTNL();
1948 
1949 	ip_mc_reset(in_dev);
1950 	ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1951 
1952 	for_each_pmc_rtnl(in_dev, pmc) {
1953 #ifdef CONFIG_IP_MULTICAST
1954 		igmpv3_del_delrec(in_dev, pmc);
1955 #endif
1956 		igmp_group_added(pmc);
1957 	}
1958 }
1959 
1960 /*
1961  *	Device is about to be destroyed: clean up.
1962  */
1963 
1964 void ip_mc_destroy_dev(struct in_device *in_dev)
1965 {
1966 	struct ip_mc_list *i;
1967 
1968 	ASSERT_RTNL();
1969 
1970 	/* Deactivate timers */
1971 	ip_mc_down(in_dev);
1972 #ifdef CONFIG_IP_MULTICAST
1973 	igmpv3_clear_delrec(in_dev);
1974 #endif
1975 
1976 	while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1977 		ip_mc_hash_remove(in_dev, i);
1978 		in_dev->mc_list = i->next_rcu;
1979 		WRITE_ONCE(in_dev->mc_count, in_dev->mc_count - 1);
1980 		ip_mc_clear_src(i);
1981 		ip_ma_put(i);
1982 	}
1983 }
1984 
1985 /* RTNL is locked */
1986 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1987 {
1988 	struct net_device *dev = NULL;
1989 	struct in_device *idev = NULL;
1990 
1991 	if (imr->imr_ifindex) {
1992 		idev = inetdev_by_index(net, imr->imr_ifindex);
1993 		return idev;
1994 	}
1995 	if (imr->imr_address.s_addr) {
1996 		dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1997 		if (!dev)
1998 			return NULL;
1999 	}
2000 
2001 	if (!dev) {
2002 		struct rtable *rt = ip_route_output(net,
2003 						    imr->imr_multiaddr.s_addr,
2004 						    0, 0, 0,
2005 						    RT_SCOPE_UNIVERSE);
2006 		if (!IS_ERR(rt)) {
2007 			dev = rt->dst.dev;
2008 			ip_rt_put(rt);
2009 		}
2010 	}
2011 	if (dev) {
2012 		imr->imr_ifindex = dev->ifindex;
2013 		idev = __in_dev_get_rtnl(dev);
2014 	}
2015 	return idev;
2016 }
2017 
2018 /*
2019  *	Join a socket to a group
2020  */
2021 
2022 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
2023 	__be32 *psfsrc)
2024 {
2025 	struct ip_sf_list *psf, *psf_prev;
2026 	int rv = 0;
2027 
2028 	psf_prev = NULL;
2029 	for_each_psf_mclock(pmc, psf) {
2030 		if (psf->sf_inaddr == *psfsrc)
2031 			break;
2032 		psf_prev = psf;
2033 	}
2034 	if (!psf || psf->sf_count[sfmode] == 0) {
2035 		/* source filter not found, or count wrong =>  bug */
2036 		return -ESRCH;
2037 	}
2038 	WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] - 1);
2039 	if (psf->sf_count[sfmode] == 0) {
2040 		ip_rt_multicast_event(pmc->interface);
2041 	}
2042 	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2043 #ifdef CONFIG_IP_MULTICAST
2044 		struct in_device *in_dev = pmc->interface;
2045 		struct net *net = dev_net(in_dev->dev);
2046 #endif
2047 
2048 		/* no more filters for this source */
2049 		if (psf_prev)
2050 			rcu_assign_pointer(psf_prev->sf_next,
2051 					   pmc_dereference(psf->sf_next, pmc));
2052 		else
2053 			rcu_assign_pointer(pmc->sources,
2054 					   pmc_dereference(psf->sf_next, pmc));
2055 #ifdef CONFIG_IP_MULTICAST
2056 		if (psf->sf_oldin &&
2057 		    !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
2058 			struct ip_sf_list *dpsf = kmalloc_obj(*dpsf, GFP_ATOMIC);
2059 
2060 			if (dpsf) {
2061 				*dpsf = *psf;
2062 				dpsf->sf_crcount = in_dev->mr_qrv ?:
2063 					READ_ONCE(net->ipv4.sysctl_igmp_qrv);
2064 				rcu_assign_pointer(dpsf->sf_next,
2065 						   pmc_dereference(pmc->tomb, pmc));
2066 				rcu_assign_pointer(pmc->tomb, dpsf);
2067 				rv = 1;
2068 			}
2069 		}
2070 #endif
2071 		kfree_rcu(psf, rcu);
2072 	}
2073 	return rv;
2074 }
2075 
2076 #ifndef CONFIG_IP_MULTICAST
2077 #define igmp_ifc_event(x)	do { } while (0)
2078 #endif
2079 
2080 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2081 			 int sfcount, __be32 *psfsrc, int delta)
2082 {
2083 	struct ip_mc_list *pmc;
2084 	int	changerec = 0;
2085 	int	i, err;
2086 
2087 	if (!in_dev)
2088 		return -ENODEV;
2089 	rcu_read_lock();
2090 	for_each_pmc_rcu(in_dev, pmc) {
2091 		if (*pmca == pmc->multiaddr)
2092 			break;
2093 	}
2094 	if (!pmc) {
2095 		/* MCA not found?? bug */
2096 		rcu_read_unlock();
2097 		return -ESRCH;
2098 	}
2099 	spin_lock_bh(&pmc->lock);
2100 	rcu_read_unlock();
2101 #ifdef CONFIG_IP_MULTICAST
2102 	sf_markstate(pmc);
2103 #endif
2104 	if (!delta) {
2105 		err = -EINVAL;
2106 		if (!pmc->sfcount[sfmode])
2107 			goto out_unlock;
2108 		WRITE_ONCE(pmc->sfcount[sfmode], pmc->sfcount[sfmode] - 1);
2109 	}
2110 	err = 0;
2111 	for (i = 0; i < sfcount; i++) {
2112 		int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2113 
2114 		changerec |= rv > 0;
2115 		if (!err && rv < 0)
2116 			err = rv;
2117 	}
2118 	if (pmc->sfmode == MCAST_EXCLUDE &&
2119 	    pmc->sfcount[MCAST_EXCLUDE] == 0 &&
2120 	    pmc->sfcount[MCAST_INCLUDE]) {
2121 #ifdef CONFIG_IP_MULTICAST
2122 		struct ip_sf_list *psf;
2123 		struct net *net = dev_net(in_dev->dev);
2124 #endif
2125 
2126 		/* filter mode change */
2127 		pmc->sfmode = MCAST_INCLUDE;
2128 #ifdef CONFIG_IP_MULTICAST
2129 		pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
2130 		WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount);
2131 		for_each_psf_mclock(pmc, psf)
2132 			psf->sf_crcount = 0;
2133 		igmp_ifc_event(pmc->interface);
2134 	} else if (sf_setstate(pmc) || changerec) {
2135 		igmp_ifc_event(pmc->interface);
2136 #endif
2137 	}
2138 out_unlock:
2139 	spin_unlock_bh(&pmc->lock);
2140 	return err;
2141 }
2142 
2143 /*
2144  * Add multicast single-source filter to the interface list
2145  */
2146 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
2147 	__be32 *psfsrc)
2148 {
2149 	struct ip_sf_list *psf, *psf_prev;
2150 
2151 	psf_prev = NULL;
2152 	for_each_psf_mclock(pmc, psf) {
2153 		if (psf->sf_inaddr == *psfsrc)
2154 			break;
2155 		psf_prev = psf;
2156 	}
2157 	if (!psf) {
2158 		psf = kzalloc_obj(*psf, GFP_ATOMIC);
2159 		if (!psf)
2160 			return -ENOBUFS;
2161 		psf->sf_inaddr = *psfsrc;
2162 		if (psf_prev)
2163 			rcu_assign_pointer(psf_prev->sf_next, psf);
2164 		else
2165 			rcu_assign_pointer(pmc->sources, psf);
2166 	}
2167 	WRITE_ONCE(psf->sf_count[sfmode], psf->sf_count[sfmode] + 1);
2168 	if (psf->sf_count[sfmode] == 1) {
2169 		ip_rt_multicast_event(pmc->interface);
2170 	}
2171 	return 0;
2172 }
2173 
2174 #ifdef CONFIG_IP_MULTICAST
2175 static void sf_markstate(struct ip_mc_list *pmc)
2176 {
2177 	struct ip_sf_list *psf;
2178 	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2179 
2180 	for_each_psf_mclock(pmc, psf) {
2181 		if (pmc->sfcount[MCAST_EXCLUDE]) {
2182 			psf->sf_oldin = mca_xcount ==
2183 				psf->sf_count[MCAST_EXCLUDE] &&
2184 				!psf->sf_count[MCAST_INCLUDE];
2185 		} else {
2186 			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2187 		}
2188 	}
2189 }
2190 
2191 static int sf_setstate(struct ip_mc_list *pmc)
2192 {
2193 	struct ip_sf_list *psf, *dpsf;
2194 	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2195 	int qrv = pmc->interface->mr_qrv;
2196 	int new_in, rv;
2197 
2198 	rv = 0;
2199 	for_each_psf_mclock(pmc, psf) {
2200 		if (pmc->sfcount[MCAST_EXCLUDE]) {
2201 			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2202 				!psf->sf_count[MCAST_INCLUDE];
2203 		} else {
2204 			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2205 		}
2206 		if (new_in) {
2207 			if (!psf->sf_oldin) {
2208 				struct ip_sf_list *prev = NULL;
2209 
2210 				for_each_psf_tomb(pmc, dpsf) {
2211 					if (dpsf->sf_inaddr == psf->sf_inaddr)
2212 						break;
2213 					prev = dpsf;
2214 				}
2215 				if (dpsf) {
2216 					struct ip_sf_list *dpsf_next;
2217 
2218 					dpsf_next = pmc_dereference(dpsf->sf_next, pmc);
2219 					if (prev)
2220 						rcu_assign_pointer(prev->sf_next, dpsf_next);
2221 					else
2222 						rcu_assign_pointer(pmc->tomb, dpsf_next);
2223 					kfree_rcu(dpsf, rcu);
2224 				}
2225 				psf->sf_crcount = qrv;
2226 				rv++;
2227 			}
2228 		} else if (psf->sf_oldin) {
2229 
2230 			psf->sf_crcount = 0;
2231 			/*
2232 			 * add or update "delete" records if an active filter
2233 			 * is now inactive
2234 			 */
2235 			for_each_psf_tomb(pmc, dpsf) {
2236 				if (dpsf->sf_inaddr == psf->sf_inaddr)
2237 					break;
2238 			}
2239 			if (!dpsf) {
2240 				dpsf = kmalloc_obj(*dpsf, GFP_ATOMIC);
2241 				if (!dpsf)
2242 					continue;
2243 				*dpsf = *psf;
2244 				/* pmc->lock held by callers */
2245 				rcu_assign_pointer(dpsf->sf_next,
2246 						   pmc_dereference(pmc->tomb, pmc));
2247 				rcu_assign_pointer(pmc->tomb, dpsf);
2248 			}
2249 			dpsf->sf_crcount = qrv;
2250 			rv++;
2251 		}
2252 	}
2253 	return rv;
2254 }
2255 #endif
2256 
2257 /*
2258  * Add multicast source filter list to the interface list
2259  */
2260 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2261 			 int sfcount, __be32 *psfsrc, int delta)
2262 {
2263 	struct ip_mc_list *pmc;
2264 	int	isexclude;
2265 	int	i, err;
2266 
2267 	if (!in_dev)
2268 		return -ENODEV;
2269 	rcu_read_lock();
2270 	for_each_pmc_rcu(in_dev, pmc) {
2271 		if (*pmca == pmc->multiaddr)
2272 			break;
2273 	}
2274 	if (!pmc) {
2275 		/* MCA not found?? bug */
2276 		rcu_read_unlock();
2277 		return -ESRCH;
2278 	}
2279 	spin_lock_bh(&pmc->lock);
2280 	rcu_read_unlock();
2281 
2282 #ifdef CONFIG_IP_MULTICAST
2283 	sf_markstate(pmc);
2284 #endif
2285 	isexclude = pmc->sfmode == MCAST_EXCLUDE;
2286 	if (!delta)
2287 		WRITE_ONCE(pmc->sfcount[sfmode], pmc->sfcount[sfmode] + 1);
2288 	err = 0;
2289 	for (i = 0; i < sfcount; i++) {
2290 		err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2291 		if (err)
2292 			break;
2293 	}
2294 	if (err) {
2295 		int j;
2296 
2297 		if (!delta)
2298 			WRITE_ONCE(pmc->sfcount[sfmode], pmc->sfcount[sfmode] - 1);
2299 		for (j = 0; j < i; j++)
2300 			(void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2301 	} else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2302 #ifdef CONFIG_IP_MULTICAST
2303 		struct ip_sf_list *psf;
2304 		struct net *net = dev_net(pmc->interface->dev);
2305 		in_dev = pmc->interface;
2306 #endif
2307 
2308 		/* filter mode change */
2309 		if (pmc->sfcount[MCAST_EXCLUDE])
2310 			pmc->sfmode = MCAST_EXCLUDE;
2311 		else if (pmc->sfcount[MCAST_INCLUDE])
2312 			pmc->sfmode = MCAST_INCLUDE;
2313 #ifdef CONFIG_IP_MULTICAST
2314 		/* else no filters; keep old mode for reports */
2315 
2316 		pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
2317 		WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount);
2318 		for_each_psf_mclock(pmc, psf)
2319 			psf->sf_crcount = 0;
2320 		igmp_ifc_event(in_dev);
2321 	} else if (sf_setstate(pmc)) {
2322 		igmp_ifc_event(in_dev);
2323 #endif
2324 	}
2325 	spin_unlock_bh(&pmc->lock);
2326 	return err;
2327 }
2328 
2329 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2330 {
2331 	struct ip_sf_list *tomb, *sources;
2332 
2333 	spin_lock_bh(&pmc->lock);
2334 	tomb = pmc_dereference(pmc->tomb, pmc);
2335 	RCU_INIT_POINTER(pmc->tomb, NULL);
2336 	sources = pmc_dereference(pmc->sources, pmc);
2337 	RCU_INIT_POINTER(pmc->sources, NULL);
2338 	pmc->sfmode = MCAST_EXCLUDE;
2339 	WRITE_ONCE(pmc->sfcount[MCAST_INCLUDE], 0);
2340 	WRITE_ONCE(pmc->sfcount[MCAST_EXCLUDE], 1);
2341 	spin_unlock_bh(&pmc->lock);
2342 
2343 	ip_sf_list_clear_all(tomb);
2344 	ip_sf_list_clear_all(sources);
2345 }
2346 
2347 /* Join a multicast group
2348  */
2349 static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr,
2350 			      unsigned int mode)
2351 {
2352 	__be32 addr = imr->imr_multiaddr.s_addr;
2353 	struct ip_mc_socklist *iml, *i;
2354 	struct in_device *in_dev;
2355 	struct inet_sock *inet = inet_sk(sk);
2356 	struct net *net = sock_net(sk);
2357 	int ifindex;
2358 	int count = 0;
2359 	int err;
2360 
2361 	ASSERT_RTNL();
2362 
2363 	if (!ipv4_is_multicast(addr))
2364 		return -EINVAL;
2365 
2366 	in_dev = ip_mc_find_dev(net, imr);
2367 
2368 	if (!in_dev) {
2369 		err = -ENODEV;
2370 		goto done;
2371 	}
2372 
2373 	err = -EADDRINUSE;
2374 	ifindex = imr->imr_ifindex;
2375 	for_each_pmc_rtnl(inet, i) {
2376 		if (i->multi.imr_multiaddr.s_addr == addr &&
2377 		    i->multi.imr_ifindex == ifindex)
2378 			goto done;
2379 		count++;
2380 	}
2381 	err = -ENOBUFS;
2382 	if (count >= READ_ONCE(net->ipv4.sysctl_igmp_max_memberships))
2383 		goto done;
2384 	iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2385 	if (!iml)
2386 		goto done;
2387 
2388 	memcpy(&iml->multi, imr, sizeof(*imr));
2389 	iml->next_rcu = inet->mc_list;
2390 	iml->sflist = NULL;
2391 	iml->sfmode = mode;
2392 	rcu_assign_pointer(inet->mc_list, iml);
2393 	____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL);
2394 	err = 0;
2395 done:
2396 	return err;
2397 }
2398 
2399 /* Join ASM (Any-Source Multicast) group
2400  */
2401 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2402 {
2403 	return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE);
2404 }
2405 EXPORT_SYMBOL(ip_mc_join_group);
2406 
2407 /* Join SSM (Source-Specific Multicast) group
2408  */
2409 int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
2410 			 unsigned int mode)
2411 {
2412 	return __ip_mc_join_group(sk, imr, mode);
2413 }
2414 
2415 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2416 			   struct in_device *in_dev)
2417 {
2418 	struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2419 	int err;
2420 
2421 	if (!psf) {
2422 		/* any-source empty exclude case */
2423 		return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2424 			iml->sfmode, 0, NULL, 0);
2425 	}
2426 	err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2427 			iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2428 	RCU_INIT_POINTER(iml->sflist, NULL);
2429 	/* decrease mem now to avoid the memleak warning */
2430 	atomic_sub(struct_size(psf, sl_addr, psf->sl_max), &sk->sk_omem_alloc);
2431 	kfree_rcu(psf, rcu);
2432 	return err;
2433 }
2434 
2435 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2436 {
2437 	struct inet_sock *inet = inet_sk(sk);
2438 	struct ip_mc_socklist *iml;
2439 	struct ip_mc_socklist __rcu **imlp;
2440 	struct in_device *in_dev;
2441 	struct net *net = sock_net(sk);
2442 	__be32 group = imr->imr_multiaddr.s_addr;
2443 	u32 ifindex;
2444 	int ret = -EADDRNOTAVAIL;
2445 
2446 	ASSERT_RTNL();
2447 
2448 	in_dev = ip_mc_find_dev(net, imr);
2449 	if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2450 		ret = -ENODEV;
2451 		goto out;
2452 	}
2453 	ifindex = imr->imr_ifindex;
2454 	for (imlp = &inet->mc_list;
2455 	     (iml = rtnl_dereference(*imlp)) != NULL;
2456 	     imlp = &iml->next_rcu) {
2457 		if (iml->multi.imr_multiaddr.s_addr != group)
2458 			continue;
2459 		if (ifindex) {
2460 			if (iml->multi.imr_ifindex != ifindex)
2461 				continue;
2462 		} else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2463 				iml->multi.imr_address.s_addr)
2464 			continue;
2465 
2466 		(void) ip_mc_leave_src(sk, iml, in_dev);
2467 
2468 		*imlp = iml->next_rcu;
2469 
2470 		if (in_dev)
2471 			ip_mc_dec_group(in_dev, group);
2472 
2473 		/* decrease mem now to avoid the memleak warning */
2474 		atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2475 		kfree_rcu(iml, rcu);
2476 		return 0;
2477 	}
2478 out:
2479 	return ret;
2480 }
2481 EXPORT_SYMBOL(ip_mc_leave_group);
2482 
2483 int ip_mc_source(int add, int omode, struct sock *sk, struct
2484 	ip_mreq_source *mreqs, int ifindex)
2485 {
2486 	int err;
2487 	struct ip_mreqn imr;
2488 	__be32 addr = mreqs->imr_multiaddr;
2489 	struct ip_mc_socklist *pmc;
2490 	struct in_device *in_dev = NULL;
2491 	struct inet_sock *inet = inet_sk(sk);
2492 	struct ip_sf_socklist *psl;
2493 	struct net *net = sock_net(sk);
2494 	int leavegroup = 0;
2495 	int i, j, rv;
2496 
2497 	if (!ipv4_is_multicast(addr))
2498 		return -EINVAL;
2499 
2500 	ASSERT_RTNL();
2501 
2502 	imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2503 	imr.imr_address.s_addr = mreqs->imr_interface;
2504 	imr.imr_ifindex = ifindex;
2505 	in_dev = ip_mc_find_dev(net, &imr);
2506 
2507 	if (!in_dev) {
2508 		err = -ENODEV;
2509 		goto done;
2510 	}
2511 	err = -EADDRNOTAVAIL;
2512 
2513 	for_each_pmc_rtnl(inet, pmc) {
2514 		if ((pmc->multi.imr_multiaddr.s_addr ==
2515 		     imr.imr_multiaddr.s_addr) &&
2516 		    (pmc->multi.imr_ifindex == imr.imr_ifindex))
2517 			break;
2518 	}
2519 	if (!pmc) {		/* must have a prior join */
2520 		err = -EINVAL;
2521 		goto done;
2522 	}
2523 	/* if a source filter was set, must be the same mode as before */
2524 	if (pmc->sflist) {
2525 		if (pmc->sfmode != omode) {
2526 			err = -EINVAL;
2527 			goto done;
2528 		}
2529 	} else if (pmc->sfmode != omode) {
2530 		/* allow mode switches for empty-set filters */
2531 		ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2532 		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2533 			NULL, 0);
2534 		pmc->sfmode = omode;
2535 	}
2536 
2537 	psl = rtnl_dereference(pmc->sflist);
2538 	if (!add) {
2539 		if (!psl)
2540 			goto done;	/* err = -EADDRNOTAVAIL */
2541 		rv = !0;
2542 		for (i = 0; i < psl->sl_count; i++) {
2543 			rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2544 				sizeof(__be32));
2545 			if (rv == 0)
2546 				break;
2547 		}
2548 		if (rv)		/* source not found */
2549 			goto done;	/* err = -EADDRNOTAVAIL */
2550 
2551 		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
2552 		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2553 			leavegroup = 1;
2554 			goto done;
2555 		}
2556 
2557 		/* update the interface filter */
2558 		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2559 			&mreqs->imr_sourceaddr, 1);
2560 
2561 		for (j = i+1; j < psl->sl_count; j++)
2562 			psl->sl_addr[j-1] = psl->sl_addr[j];
2563 		psl->sl_count--;
2564 		err = 0;
2565 		goto done;
2566 	}
2567 	/* else, add a new source to the filter */
2568 
2569 	if (psl && psl->sl_count >= READ_ONCE(net->ipv4.sysctl_igmp_max_msf)) {
2570 		err = -ENOBUFS;
2571 		goto done;
2572 	}
2573 	if (!psl || psl->sl_count == psl->sl_max) {
2574 		struct ip_sf_socklist *newpsl;
2575 		int count = IP_SFBLOCK;
2576 
2577 		if (psl)
2578 			count += psl->sl_max;
2579 		newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count),
2580 				      GFP_KERNEL);
2581 		if (!newpsl) {
2582 			err = -ENOBUFS;
2583 			goto done;
2584 		}
2585 		newpsl->sl_max = count;
2586 		newpsl->sl_count = count - IP_SFBLOCK;
2587 		if (psl) {
2588 			for (i = 0; i < psl->sl_count; i++)
2589 				newpsl->sl_addr[i] = psl->sl_addr[i];
2590 			/* decrease mem now to avoid the memleak warning */
2591 			atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2592 				   &sk->sk_omem_alloc);
2593 		}
2594 		rcu_assign_pointer(pmc->sflist, newpsl);
2595 		if (psl)
2596 			kfree_rcu(psl, rcu);
2597 		psl = newpsl;
2598 	}
2599 	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
2600 	for (i = 0; i < psl->sl_count; i++) {
2601 		rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2602 			sizeof(__be32));
2603 		if (rv == 0)
2604 			break;
2605 	}
2606 	if (rv == 0)		/* address already there is an error */
2607 		goto done;
2608 	for (j = psl->sl_count-1; j >= i; j--)
2609 		psl->sl_addr[j+1] = psl->sl_addr[j];
2610 	psl->sl_addr[i] = mreqs->imr_sourceaddr;
2611 	psl->sl_count++;
2612 	err = 0;
2613 	/* update the interface list */
2614 	ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2615 		&mreqs->imr_sourceaddr, 1);
2616 done:
2617 	if (leavegroup)
2618 		err = ip_mc_leave_group(sk, &imr);
2619 	return err;
2620 }
2621 
2622 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2623 {
2624 	int err = 0;
2625 	struct ip_mreqn	imr;
2626 	__be32 addr = msf->imsf_multiaddr;
2627 	struct ip_mc_socklist *pmc;
2628 	struct in_device *in_dev;
2629 	struct inet_sock *inet = inet_sk(sk);
2630 	struct ip_sf_socklist *newpsl, *psl;
2631 	struct net *net = sock_net(sk);
2632 	int leavegroup = 0;
2633 
2634 	if (!ipv4_is_multicast(addr))
2635 		return -EINVAL;
2636 	if (msf->imsf_fmode != MCAST_INCLUDE &&
2637 	    msf->imsf_fmode != MCAST_EXCLUDE)
2638 		return -EINVAL;
2639 
2640 	ASSERT_RTNL();
2641 
2642 	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2643 	imr.imr_address.s_addr = msf->imsf_interface;
2644 	imr.imr_ifindex = ifindex;
2645 	in_dev = ip_mc_find_dev(net, &imr);
2646 
2647 	if (!in_dev) {
2648 		err = -ENODEV;
2649 		goto done;
2650 	}
2651 
2652 	/* special case - (INCLUDE, empty) == LEAVE_GROUP */
2653 	if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2654 		leavegroup = 1;
2655 		goto done;
2656 	}
2657 
2658 	for_each_pmc_rtnl(inet, pmc) {
2659 		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2660 		    pmc->multi.imr_ifindex == imr.imr_ifindex)
2661 			break;
2662 	}
2663 	if (!pmc) {		/* must have a prior join */
2664 		err = -EINVAL;
2665 		goto done;
2666 	}
2667 	if (msf->imsf_numsrc) {
2668 		newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr,
2669 						      msf->imsf_numsrc),
2670 				      GFP_KERNEL);
2671 		if (!newpsl) {
2672 			err = -ENOBUFS;
2673 			goto done;
2674 		}
2675 		newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2676 		memcpy(newpsl->sl_addr, msf->imsf_slist_flex,
2677 		       flex_array_size(msf, imsf_slist_flex, msf->imsf_numsrc));
2678 		err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2679 			msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2680 		if (err) {
2681 			sock_kfree_s(sk, newpsl,
2682 				     struct_size(newpsl, sl_addr,
2683 						 newpsl->sl_max));
2684 			goto done;
2685 		}
2686 	} else {
2687 		newpsl = NULL;
2688 		(void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2689 				     msf->imsf_fmode, 0, NULL, 0);
2690 	}
2691 	psl = rtnl_dereference(pmc->sflist);
2692 	if (psl) {
2693 		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2694 			psl->sl_count, psl->sl_addr, 0);
2695 		/* decrease mem now to avoid the memleak warning */
2696 		atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2697 			   &sk->sk_omem_alloc);
2698 	} else {
2699 		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2700 			0, NULL, 0);
2701 	}
2702 	rcu_assign_pointer(pmc->sflist, newpsl);
2703 	if (psl)
2704 		kfree_rcu(psl, rcu);
2705 	pmc->sfmode = msf->imsf_fmode;
2706 	err = 0;
2707 done:
2708 	if (leavegroup)
2709 		err = ip_mc_leave_group(sk, &imr);
2710 	return err;
2711 }
2712 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2713 		 sockptr_t optval, sockptr_t optlen)
2714 {
2715 	int err, len, count, copycount, msf_size;
2716 	struct ip_mreqn	imr;
2717 	__be32 addr = msf->imsf_multiaddr;
2718 	struct ip_mc_socklist *pmc;
2719 	struct in_device *in_dev;
2720 	struct inet_sock *inet = inet_sk(sk);
2721 	struct ip_sf_socklist *psl;
2722 	struct net *net = sock_net(sk);
2723 
2724 	ASSERT_RTNL();
2725 
2726 	if (!ipv4_is_multicast(addr))
2727 		return -EINVAL;
2728 
2729 	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2730 	imr.imr_address.s_addr = msf->imsf_interface;
2731 	imr.imr_ifindex = 0;
2732 	in_dev = ip_mc_find_dev(net, &imr);
2733 
2734 	if (!in_dev) {
2735 		err = -ENODEV;
2736 		goto done;
2737 	}
2738 	err = -EADDRNOTAVAIL;
2739 
2740 	for_each_pmc_rtnl(inet, pmc) {
2741 		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2742 		    pmc->multi.imr_ifindex == imr.imr_ifindex)
2743 			break;
2744 	}
2745 	if (!pmc)		/* must have a prior join */
2746 		goto done;
2747 	msf->imsf_fmode = pmc->sfmode;
2748 	psl = rtnl_dereference(pmc->sflist);
2749 	if (!psl) {
2750 		count = 0;
2751 	} else {
2752 		count = psl->sl_count;
2753 	}
2754 	copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2755 	len = flex_array_size(psl, sl_addr, copycount);
2756 	msf->imsf_numsrc = count;
2757 	msf_size = IP_MSFILTER_SIZE(copycount);
2758 	if (copy_to_sockptr(optlen, &msf_size, sizeof(int)) ||
2759 	    copy_to_sockptr(optval, msf, IP_MSFILTER_SIZE(0))) {
2760 		return -EFAULT;
2761 	}
2762 	if (len &&
2763 	    copy_to_sockptr_offset(optval,
2764 				   offsetof(struct ip_msfilter, imsf_slist_flex),
2765 				   psl->sl_addr, len))
2766 		return -EFAULT;
2767 	return 0;
2768 done:
2769 	return err;
2770 }
2771 
2772 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2773 		 sockptr_t optval, size_t ss_offset)
2774 {
2775 	int i, count, copycount;
2776 	struct sockaddr_in *psin;
2777 	__be32 addr;
2778 	struct ip_mc_socklist *pmc;
2779 	struct inet_sock *inet = inet_sk(sk);
2780 	struct ip_sf_socklist *psl;
2781 
2782 	ASSERT_RTNL();
2783 
2784 	psin = (struct sockaddr_in *)&gsf->gf_group;
2785 	if (psin->sin_family != AF_INET)
2786 		return -EINVAL;
2787 	addr = psin->sin_addr.s_addr;
2788 	if (!ipv4_is_multicast(addr))
2789 		return -EINVAL;
2790 
2791 	for_each_pmc_rtnl(inet, pmc) {
2792 		if (pmc->multi.imr_multiaddr.s_addr == addr &&
2793 		    pmc->multi.imr_ifindex == gsf->gf_interface)
2794 			break;
2795 	}
2796 	if (!pmc)		/* must have a prior join */
2797 		return -EADDRNOTAVAIL;
2798 	gsf->gf_fmode = pmc->sfmode;
2799 	psl = rtnl_dereference(pmc->sflist);
2800 	count = psl ? psl->sl_count : 0;
2801 	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2802 	gsf->gf_numsrc = count;
2803 	for (i = 0; i < copycount; i++) {
2804 		struct sockaddr_storage ss;
2805 
2806 		psin = (struct sockaddr_in *)&ss;
2807 		memset(&ss, 0, sizeof(ss));
2808 		psin->sin_family = AF_INET;
2809 		psin->sin_addr.s_addr = psl->sl_addr[i];
2810 		if (copy_to_sockptr_offset(optval, ss_offset,
2811 					   &ss, sizeof(ss)))
2812 			return -EFAULT;
2813 		ss_offset += sizeof(ss);
2814 	}
2815 	return 0;
2816 }
2817 
2818 /*
2819  * check if a multicast source filter allows delivery for a given <src,dst,intf>
2820  */
2821 int ip_mc_sf_allow(const struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
2822 		   int dif, int sdif)
2823 {
2824 	const struct inet_sock *inet = inet_sk(sk);
2825 	struct ip_mc_socklist *pmc;
2826 	struct ip_sf_socklist *psl;
2827 	int i;
2828 	int ret;
2829 
2830 	ret = 1;
2831 	if (!ipv4_is_multicast(loc_addr))
2832 		goto out;
2833 
2834 	rcu_read_lock();
2835 	for_each_pmc_rcu(inet, pmc) {
2836 		if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2837 		    (pmc->multi.imr_ifindex == dif ||
2838 		     (sdif && pmc->multi.imr_ifindex == sdif)))
2839 			break;
2840 	}
2841 	ret = inet_test_bit(MC_ALL, sk);
2842 	if (!pmc)
2843 		goto unlock;
2844 	psl = rcu_dereference(pmc->sflist);
2845 	ret = (pmc->sfmode == MCAST_EXCLUDE);
2846 	if (!psl)
2847 		goto unlock;
2848 
2849 	for (i = 0; i < psl->sl_count; i++) {
2850 		if (psl->sl_addr[i] == rmt_addr)
2851 			break;
2852 	}
2853 	ret = 0;
2854 	if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2855 		goto unlock;
2856 	if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2857 		goto unlock;
2858 	ret = 1;
2859 unlock:
2860 	rcu_read_unlock();
2861 out:
2862 	return ret;
2863 }
2864 
2865 /*
2866  *	A socket is closing.
2867  */
2868 
2869 void ip_mc_drop_socket(struct sock *sk)
2870 {
2871 	struct inet_sock *inet = inet_sk(sk);
2872 	struct ip_mc_socklist *iml;
2873 	struct net *net = sock_net(sk);
2874 
2875 	if (!inet->mc_list)
2876 		return;
2877 
2878 	rtnl_lock();
2879 	while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2880 		struct in_device *in_dev;
2881 
2882 		inet->mc_list = iml->next_rcu;
2883 		in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2884 		(void) ip_mc_leave_src(sk, iml, in_dev);
2885 		if (in_dev)
2886 			ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2887 		/* decrease mem now to avoid the memleak warning */
2888 		atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2889 		kfree_rcu(iml, rcu);
2890 	}
2891 	rtnl_unlock();
2892 }
2893 
2894 /* called with rcu_read_lock() */
2895 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2896 {
2897 	struct ip_mc_list *im;
2898 	struct ip_mc_list __rcu **mc_hash;
2899 	struct ip_sf_list *psf;
2900 	int rv = 0;
2901 
2902 	mc_hash = rcu_dereference(in_dev->mc_hash);
2903 	if (mc_hash) {
2904 		u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2905 
2906 		for (im = rcu_dereference(mc_hash[hash]);
2907 		     im != NULL;
2908 		     im = rcu_dereference(im->next_hash)) {
2909 			if (im->multiaddr == mc_addr)
2910 				break;
2911 		}
2912 	} else {
2913 		for_each_pmc_rcu(in_dev, im) {
2914 			if (im->multiaddr == mc_addr)
2915 				break;
2916 		}
2917 	}
2918 	if (im && proto == IPPROTO_IGMP) {
2919 		rv = 1;
2920 	} else if (im) {
2921 		if (src_addr) {
2922 			for_each_psf_rcu(im, psf) {
2923 				if (psf->sf_inaddr == src_addr)
2924 					break;
2925 			}
2926 			if (psf)
2927 				rv = READ_ONCE(psf->sf_count[MCAST_INCLUDE]) ||
2928 					READ_ONCE(psf->sf_count[MCAST_EXCLUDE]) !=
2929 					READ_ONCE(im->sfcount[MCAST_EXCLUDE]);
2930 			else
2931 				rv = READ_ONCE(im->sfcount[MCAST_EXCLUDE]) != 0;
2932 		} else {
2933 			rv = 1; /* unspecified source; tentatively allow */
2934 		}
2935 	}
2936 	return rv;
2937 }
2938 
2939 #if defined(CONFIG_PROC_FS)
2940 struct igmp_mc_iter_state {
2941 	struct seq_net_private p;
2942 	struct net_device *dev;
2943 	struct in_device *in_dev;
2944 };
2945 
2946 #define	igmp_mc_seq_private(seq)	((struct igmp_mc_iter_state *)(seq)->private)
2947 
2948 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2949 {
2950 	struct net *net = seq_file_net(seq);
2951 	struct ip_mc_list *im = NULL;
2952 	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2953 
2954 	state->in_dev = NULL;
2955 	for_each_netdev_rcu(net, state->dev) {
2956 		struct in_device *in_dev;
2957 
2958 		in_dev = __in_dev_get_rcu(state->dev);
2959 		if (!in_dev)
2960 			continue;
2961 		im = rcu_dereference(in_dev->mc_list);
2962 		if (im) {
2963 			state->in_dev = in_dev;
2964 			break;
2965 		}
2966 	}
2967 	return im;
2968 }
2969 
2970 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2971 {
2972 	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2973 
2974 	im = rcu_dereference(im->next_rcu);
2975 	while (!im) {
2976 		state->dev = next_net_device_rcu(state->dev);
2977 		if (!state->dev) {
2978 			state->in_dev = NULL;
2979 			break;
2980 		}
2981 		state->in_dev = __in_dev_get_rcu(state->dev);
2982 		if (!state->in_dev)
2983 			continue;
2984 		im = rcu_dereference(state->in_dev->mc_list);
2985 	}
2986 	return im;
2987 }
2988 
2989 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2990 {
2991 	struct ip_mc_list *im = igmp_mc_get_first(seq);
2992 	if (im)
2993 		while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2994 			--pos;
2995 	return pos ? NULL : im;
2996 }
2997 
2998 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2999 	__acquires(rcu)
3000 {
3001 	rcu_read_lock();
3002 	return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3003 }
3004 
3005 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3006 {
3007 	struct ip_mc_list *im;
3008 	if (v == SEQ_START_TOKEN)
3009 		im = igmp_mc_get_first(seq);
3010 	else
3011 		im = igmp_mc_get_next(seq, v);
3012 	++*pos;
3013 	return im;
3014 }
3015 
3016 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
3017 	__releases(rcu)
3018 {
3019 	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
3020 
3021 	state->in_dev = NULL;
3022 	state->dev = NULL;
3023 	rcu_read_unlock();
3024 }
3025 
3026 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
3027 {
3028 	if (v == SEQ_START_TOKEN)
3029 		seq_puts(seq,
3030 			 "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
3031 	else {
3032 		struct ip_mc_list *im = v;
3033 		struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
3034 		char   *querier;
3035 		int tm_running;
3036 		long delta;
3037 
3038 #ifdef CONFIG_IP_MULTICAST
3039 		querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
3040 			  IGMP_V2_SEEN(state->in_dev) ? "V2" :
3041 			  "V3";
3042 #else
3043 		querier = "NONE";
3044 #endif
3045 
3046 		if (rcu_access_pointer(state->in_dev->mc_list) == im) {
3047 			seq_printf(seq, "%d\t%-10s: %5d %7s\n",
3048 				   state->dev->ifindex, state->dev->name,
3049 				   READ_ONCE(state->in_dev->mc_count),
3050 				   querier);
3051 		}
3052 
3053 		tm_running = READ_ONCE(im->tm_running);
3054 		delta = READ_ONCE(im->timer.expires) - jiffies;
3055 		seq_printf(seq,
3056 			   "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
3057 			   im->multiaddr, READ_ONCE(im->users),
3058 			   tm_running,
3059 			   tm_running ? jiffies_delta_to_clock_t(delta) : 0,
3060 			   READ_ONCE(im->reporter));
3061 	}
3062 	return 0;
3063 }
3064 
3065 static const struct seq_operations igmp_mc_seq_ops = {
3066 	.start	=	igmp_mc_seq_start,
3067 	.next	=	igmp_mc_seq_next,
3068 	.stop	=	igmp_mc_seq_stop,
3069 	.show	=	igmp_mc_seq_show,
3070 };
3071 
3072 struct igmp_mcf_iter_state {
3073 	struct seq_net_private p;
3074 	struct net_device *dev;
3075 	struct in_device *idev;
3076 	struct ip_mc_list *im;
3077 };
3078 
3079 #define igmp_mcf_seq_private(seq)	((struct igmp_mcf_iter_state *)(seq)->private)
3080 
3081 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
3082 {
3083 	struct net *net = seq_file_net(seq);
3084 	struct ip_sf_list *psf = NULL;
3085 	struct ip_mc_list *im = NULL;
3086 	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
3087 
3088 	state->idev = NULL;
3089 	state->im = NULL;
3090 	for_each_netdev_rcu(net, state->dev) {
3091 		struct in_device *idev;
3092 		idev = __in_dev_get_rcu(state->dev);
3093 		if (unlikely(!idev))
3094 			continue;
3095 		im = rcu_dereference(idev->mc_list);
3096 		if (likely(im)) {
3097 			spin_lock_bh(&im->lock);
3098 			psf = pmc_dereference(im->sources, im);
3099 			if (likely(psf)) {
3100 				state->im = im;
3101 				state->idev = idev;
3102 				break;
3103 			}
3104 			spin_unlock_bh(&im->lock);
3105 		}
3106 	}
3107 	return psf;
3108 }
3109 
3110 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
3111 {
3112 	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
3113 
3114 	psf = pmc_dereference(psf->sf_next, state->im);
3115 	while (!psf) {
3116 		spin_unlock_bh(&state->im->lock);
3117 		state->im = state->im->next;
3118 		while (!state->im) {
3119 			state->dev = next_net_device_rcu(state->dev);
3120 			if (!state->dev) {
3121 				state->idev = NULL;
3122 				goto out;
3123 			}
3124 			state->idev = __in_dev_get_rcu(state->dev);
3125 			if (!state->idev)
3126 				continue;
3127 			state->im = rcu_dereference(state->idev->mc_list);
3128 		}
3129 		spin_lock_bh(&state->im->lock);
3130 		psf = pmc_dereference(state->im->sources, state->im);
3131 	}
3132 out:
3133 	return psf;
3134 }
3135 
3136 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
3137 {
3138 	struct ip_sf_list *psf = igmp_mcf_get_first(seq);
3139 	if (psf)
3140 		while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
3141 			--pos;
3142 	return pos ? NULL : psf;
3143 }
3144 
3145 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3146 	__acquires(rcu)
3147 {
3148 	rcu_read_lock();
3149 	return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3150 }
3151 
3152 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3153 {
3154 	struct ip_sf_list *psf;
3155 	if (v == SEQ_START_TOKEN)
3156 		psf = igmp_mcf_get_first(seq);
3157 	else
3158 		psf = igmp_mcf_get_next(seq, v);
3159 	++*pos;
3160 	return psf;
3161 }
3162 
3163 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
3164 	__releases(rcu)
3165 {
3166 	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
3167 	if (likely(state->im)) {
3168 		spin_unlock_bh(&state->im->lock);
3169 		state->im = NULL;
3170 	}
3171 	state->idev = NULL;
3172 	state->dev = NULL;
3173 	rcu_read_unlock();
3174 }
3175 
3176 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
3177 {
3178 	struct ip_sf_list *psf = v;
3179 	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
3180 
3181 	if (v == SEQ_START_TOKEN) {
3182 		seq_puts(seq, "Idx Device        MCA        SRC    INC    EXC\n");
3183 	} else {
3184 		seq_printf(seq,
3185 			   "%3d %6.6s 0x%08x "
3186 			   "0x%08x %6lu %6lu\n",
3187 			   state->dev->ifindex, state->dev->name,
3188 			   ntohl(state->im->multiaddr),
3189 			   ntohl(psf->sf_inaddr),
3190 			   psf->sf_count[MCAST_INCLUDE],
3191 			   psf->sf_count[MCAST_EXCLUDE]);
3192 	}
3193 	return 0;
3194 }
3195 
3196 static const struct seq_operations igmp_mcf_seq_ops = {
3197 	.start	=	igmp_mcf_seq_start,
3198 	.next	=	igmp_mcf_seq_next,
3199 	.stop	=	igmp_mcf_seq_stop,
3200 	.show	=	igmp_mcf_seq_show,
3201 };
3202 
3203 static int __net_init igmp_net_init(struct net *net)
3204 {
3205 	struct proc_dir_entry *pde;
3206 	int err;
3207 
3208 	pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops,
3209 			sizeof(struct igmp_mc_iter_state));
3210 	if (!pde)
3211 		goto out_igmp;
3212 	pde = proc_create_net("mcfilter", 0444, net->proc_net,
3213 			&igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state));
3214 	if (!pde)
3215 		goto out_mcfilter;
3216 	err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
3217 				   SOCK_DGRAM, 0, net);
3218 	if (err < 0) {
3219 		pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
3220 		       err);
3221 		goto out_sock;
3222 	}
3223 
3224 	return 0;
3225 
3226 out_sock:
3227 	remove_proc_entry("mcfilter", net->proc_net);
3228 out_mcfilter:
3229 	remove_proc_entry("igmp", net->proc_net);
3230 out_igmp:
3231 	return -ENOMEM;
3232 }
3233 
3234 static void __net_exit igmp_net_exit(struct net *net)
3235 {
3236 	remove_proc_entry("mcfilter", net->proc_net);
3237 	remove_proc_entry("igmp", net->proc_net);
3238 	inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
3239 }
3240 
3241 static struct pernet_operations igmp_net_ops = {
3242 	.init = igmp_net_init,
3243 	.exit = igmp_net_exit,
3244 };
3245 #endif
3246 
3247 static int igmp_netdev_event(struct notifier_block *this,
3248 			     unsigned long event, void *ptr)
3249 {
3250 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3251 	struct in_device *in_dev;
3252 
3253 	switch (event) {
3254 	case NETDEV_RESEND_IGMP:
3255 		in_dev = __in_dev_get_rtnl(dev);
3256 		if (in_dev)
3257 			ip_mc_rejoin_groups(in_dev);
3258 		break;
3259 	default:
3260 		break;
3261 	}
3262 	return NOTIFY_DONE;
3263 }
3264 
3265 static struct notifier_block igmp_notifier = {
3266 	.notifier_call = igmp_netdev_event,
3267 };
3268 
3269 int __init igmp_mc_init(void)
3270 {
3271 #if defined(CONFIG_PROC_FS)
3272 	int err;
3273 
3274 	err = register_pernet_subsys(&igmp_net_ops);
3275 	if (err)
3276 		return err;
3277 	err = register_netdevice_notifier(&igmp_notifier);
3278 	if (err)
3279 		goto reg_notif_fail;
3280 	return 0;
3281 
3282 reg_notif_fail:
3283 	unregister_pernet_subsys(&igmp_net_ops);
3284 	return err;
3285 #else
3286 	return register_netdevice_notifier(&igmp_notifier);
3287 #endif
3288 }
3289