xref: /openbmc/linux/net/ipv6/mcast.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
1 /*
2  *	Multicast support for IPv6
3  *	Linux INET6 implementation
4  *
5  *	Authors:
6  *	Pedro Roque		<roque@di.fc.ul.pt>
7  *
8  *	$Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
9  *
10  *	Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
11  *
12  *	This program is free software; you can redistribute it and/or
13  *      modify it under the terms of the GNU General Public License
14  *      as published by the Free Software Foundation; either version
15  *      2 of the License, or (at your option) any later version.
16  */
17 
18 /* Changes:
19  *
20  *	yoshfuji	: fix format of router-alert option
21  *	YOSHIFUJI Hideaki @USAGI:
22  *		Fixed source address for MLD message based on
23  *		<draft-ietf-magma-mld-source-05.txt>.
24  *	YOSHIFUJI Hideaki @USAGI:
25  *		- Ignore Queries for invalid addresses.
26  *		- MLD for link-local addresses.
27  *	David L Stevens <dlstevens@us.ibm.com>:
28  *		- MLDv2 support
29  */
30 
31 #include <linux/config.h>
32 #include <linux/module.h>
33 #include <linux/errno.h>
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/socket.h>
37 #include <linux/sockios.h>
38 #include <linux/jiffies.h>
39 #include <linux/times.h>
40 #include <linux/net.h>
41 #include <linux/in.h>
42 #include <linux/in6.h>
43 #include <linux/netdevice.h>
44 #include <linux/if_arp.h>
45 #include <linux/route.h>
46 #include <linux/init.h>
47 #include <linux/proc_fs.h>
48 #include <linux/seq_file.h>
49 
50 #include <linux/netfilter.h>
51 #include <linux/netfilter_ipv6.h>
52 
53 #include <net/sock.h>
54 #include <net/snmp.h>
55 
56 #include <net/ipv6.h>
57 #include <net/protocol.h>
58 #include <net/if_inet6.h>
59 #include <net/ndisc.h>
60 #include <net/addrconf.h>
61 #include <net/ip6_route.h>
62 
63 #include <net/ip6_checksum.h>
64 
65 /* Set to 3 to get tracing... */
66 #define MCAST_DEBUG 2
67 
68 #if MCAST_DEBUG >= 3
69 #define MDBG(x) printk x
70 #else
71 #define MDBG(x)
72 #endif
73 
74 /*
75  *  These header formats should be in a separate include file, but icmpv6.h
76  *  doesn't have in6_addr defined in all cases, there is no __u128, and no
77  *  other files reference these.
78  *
79  *  			+-DLS 4/14/03
80  */
81 
82 /* Multicast Listener Discovery version 2 headers */
83 
84 struct mld2_grec {
85 	__u8		grec_type;
86 	__u8		grec_auxwords;
87 	__u16		grec_nsrcs;
88 	struct in6_addr	grec_mca;
89 	struct in6_addr	grec_src[0];
90 };
91 
92 struct mld2_report {
93 	__u8	type;
94 	__u8	resv1;
95 	__u16	csum;
96 	__u16	resv2;
97 	__u16	ngrec;
98 	struct mld2_grec grec[0];
99 };
100 
101 struct mld2_query {
102 	__u8 type;
103 	__u8 code;
104 	__u16 csum;
105 	__u16 mrc;
106 	__u16 resv1;
107 	struct in6_addr mca;
108 #if defined(__LITTLE_ENDIAN_BITFIELD)
109 	__u8 qrv:3,
110 	     suppress:1,
111 	     resv2:4;
112 #elif defined(__BIG_ENDIAN_BITFIELD)
113 	__u8 resv2:4,
114 	     suppress:1,
115 	     qrv:3;
116 #else
117 #error "Please fix <asm/byteorder.h>"
118 #endif
119 	__u8 qqic;
120 	__u16 nsrcs;
121 	struct in6_addr srcs[0];
122 };
123 
124 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
125 
126 /* Big mc list lock for all the sockets */
127 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
128 
129 static struct socket *igmp6_socket;
130 
131 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
132 
133 static void igmp6_join_group(struct ifmcaddr6 *ma);
134 static void igmp6_leave_group(struct ifmcaddr6 *ma);
135 static void igmp6_timer_handler(unsigned long data);
136 
137 static void mld_gq_timer_expire(unsigned long data);
138 static void mld_ifc_timer_expire(unsigned long data);
139 static void mld_ifc_event(struct inet6_dev *idev);
140 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
141 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
142 static void mld_clear_delrec(struct inet6_dev *idev);
143 static int sf_setstate(struct ifmcaddr6 *pmc);
144 static void sf_markstate(struct ifmcaddr6 *pmc);
145 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
146 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
147 			  int sfmode, int sfcount, struct in6_addr *psfsrc,
148 			  int delta);
149 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
150 			  int sfmode, int sfcount, struct in6_addr *psfsrc,
151 			  int delta);
152 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
153 			    struct inet6_dev *idev);
154 
155 
156 #define IGMP6_UNSOLICITED_IVAL	(10*HZ)
157 #define MLD_QRV_DEFAULT		2
158 
159 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
160 		(idev)->cnf.force_mld_version == 1 || \
161 		((idev)->mc_v1_seen && \
162 		time_before(jiffies, (idev)->mc_v1_seen)))
163 
164 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
165 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
166 	((value) < (thresh) ? (value) : \
167 	((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
168 	(MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
169 
170 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
171 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
172 
173 #define IPV6_MLD_MAX_MSF	10
174 
175 int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF;
176 
177 /*
178  *	socket join on multicast group
179  */
180 
181 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
182 {
183 	struct net_device *dev = NULL;
184 	struct ipv6_mc_socklist *mc_lst;
185 	struct ipv6_pinfo *np = inet6_sk(sk);
186 	int err;
187 
188 	if (!ipv6_addr_is_multicast(addr))
189 		return -EINVAL;
190 
191 	read_lock_bh(&ipv6_sk_mc_lock);
192 	for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
193 		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
194 		    ipv6_addr_equal(&mc_lst->addr, addr)) {
195 			read_unlock_bh(&ipv6_sk_mc_lock);
196 			return -EADDRINUSE;
197 		}
198 	}
199 	read_unlock_bh(&ipv6_sk_mc_lock);
200 
201 	mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
202 
203 	if (mc_lst == NULL)
204 		return -ENOMEM;
205 
206 	mc_lst->next = NULL;
207 	ipv6_addr_copy(&mc_lst->addr, addr);
208 
209 	if (ifindex == 0) {
210 		struct rt6_info *rt;
211 		rt = rt6_lookup(addr, NULL, 0, 0);
212 		if (rt) {
213 			dev = rt->rt6i_dev;
214 			dev_hold(dev);
215 			dst_release(&rt->u.dst);
216 		}
217 	} else
218 		dev = dev_get_by_index(ifindex);
219 
220 	if (dev == NULL) {
221 		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
222 		return -ENODEV;
223 	}
224 
225 	mc_lst->ifindex = dev->ifindex;
226 	mc_lst->sfmode = MCAST_EXCLUDE;
227 	mc_lst->sflist = NULL;
228 
229 	/*
230 	 *	now add/increase the group membership on the device
231 	 */
232 
233 	err = ipv6_dev_mc_inc(dev, addr);
234 
235 	if (err) {
236 		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
237 		dev_put(dev);
238 		return err;
239 	}
240 
241 	write_lock_bh(&ipv6_sk_mc_lock);
242 	mc_lst->next = np->ipv6_mc_list;
243 	np->ipv6_mc_list = mc_lst;
244 	write_unlock_bh(&ipv6_sk_mc_lock);
245 
246 	dev_put(dev);
247 
248 	return 0;
249 }
250 
251 /*
252  *	socket leave on multicast group
253  */
254 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
255 {
256 	struct ipv6_pinfo *np = inet6_sk(sk);
257 	struct ipv6_mc_socklist *mc_lst, **lnk;
258 
259 	write_lock_bh(&ipv6_sk_mc_lock);
260 	for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
261 		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
262 		    ipv6_addr_equal(&mc_lst->addr, addr)) {
263 			struct net_device *dev;
264 
265 			*lnk = mc_lst->next;
266 			write_unlock_bh(&ipv6_sk_mc_lock);
267 
268 			if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
269 				struct inet6_dev *idev = in6_dev_get(dev);
270 
271 				if (idev) {
272 					(void) ip6_mc_leave_src(sk,mc_lst,idev);
273 					__ipv6_dev_mc_dec(idev, &mc_lst->addr);
274 					in6_dev_put(idev);
275 				}
276 				dev_put(dev);
277 			}
278 			sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
279 			return 0;
280 		}
281 	}
282 	write_unlock_bh(&ipv6_sk_mc_lock);
283 
284 	return -EADDRNOTAVAIL;
285 }
286 
287 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
288 {
289 	struct net_device *dev = NULL;
290 	struct inet6_dev *idev = NULL;
291 
292 	if (ifindex == 0) {
293 		struct rt6_info *rt;
294 
295 		rt = rt6_lookup(group, NULL, 0, 0);
296 		if (rt) {
297 			dev = rt->rt6i_dev;
298 			dev_hold(dev);
299 			dst_release(&rt->u.dst);
300 		}
301 	} else
302 		dev = dev_get_by_index(ifindex);
303 
304 	if (!dev)
305 		return NULL;
306 	idev = in6_dev_get(dev);
307 	if (!idev) {
308 		dev_put(dev);
309 		return NULL;
310 	}
311 	read_lock_bh(&idev->lock);
312 	if (idev->dead) {
313 		read_unlock_bh(&idev->lock);
314 		in6_dev_put(idev);
315 		dev_put(dev);
316 		return NULL;
317 	}
318 	return idev;
319 }
320 
321 void ipv6_sock_mc_close(struct sock *sk)
322 {
323 	struct ipv6_pinfo *np = inet6_sk(sk);
324 	struct ipv6_mc_socklist *mc_lst;
325 
326 	write_lock_bh(&ipv6_sk_mc_lock);
327 	while ((mc_lst = np->ipv6_mc_list) != NULL) {
328 		struct net_device *dev;
329 
330 		np->ipv6_mc_list = mc_lst->next;
331 		write_unlock_bh(&ipv6_sk_mc_lock);
332 
333 		dev = dev_get_by_index(mc_lst->ifindex);
334 		if (dev) {
335 			struct inet6_dev *idev = in6_dev_get(dev);
336 
337 			if (idev) {
338 				(void) ip6_mc_leave_src(sk, mc_lst, idev);
339 				__ipv6_dev_mc_dec(idev, &mc_lst->addr);
340 				in6_dev_put(idev);
341 			}
342 			dev_put(dev);
343 		}
344 
345 		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
346 
347 		write_lock_bh(&ipv6_sk_mc_lock);
348 	}
349 	write_unlock_bh(&ipv6_sk_mc_lock);
350 }
351 
352 int ip6_mc_source(int add, int omode, struct sock *sk,
353 	struct group_source_req *pgsr)
354 {
355 	struct in6_addr *source, *group;
356 	struct ipv6_mc_socklist *pmc;
357 	struct net_device *dev;
358 	struct inet6_dev *idev;
359 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
360 	struct ip6_sf_socklist *psl;
361 	int i, j, rv;
362 	int leavegroup = 0;
363 	int err;
364 
365 	if (pgsr->gsr_group.ss_family != AF_INET6 ||
366 	    pgsr->gsr_source.ss_family != AF_INET6)
367 		return -EINVAL;
368 
369 	source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
370 	group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
371 
372 	if (!ipv6_addr_is_multicast(group))
373 		return -EINVAL;
374 
375 	idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
376 	if (!idev)
377 		return -ENODEV;
378 	dev = idev->dev;
379 
380 	err = -EADDRNOTAVAIL;
381 
382 	read_lock_bh(&ipv6_sk_mc_lock);
383 	for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
384 		if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
385 			continue;
386 		if (ipv6_addr_equal(&pmc->addr, group))
387 			break;
388 	}
389 	if (!pmc) {		/* must have a prior join */
390 		err = -EINVAL;
391 		goto done;
392 	}
393 	/* if a source filter was set, must be the same mode as before */
394 	if (pmc->sflist) {
395 		if (pmc->sfmode != omode) {
396 			err = -EINVAL;
397 			goto done;
398 		}
399 	} else if (pmc->sfmode != omode) {
400 		/* allow mode switches for empty-set filters */
401 		ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
402 		ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
403 		pmc->sfmode = omode;
404 	}
405 
406 	psl = pmc->sflist;
407 	if (!add) {
408 		if (!psl)
409 			goto done;	/* err = -EADDRNOTAVAIL */
410 		rv = !0;
411 		for (i=0; i<psl->sl_count; i++) {
412 			rv = memcmp(&psl->sl_addr[i], source,
413 				sizeof(struct in6_addr));
414 			if (rv == 0)
415 				break;
416 		}
417 		if (rv)		/* source not found */
418 			goto done;	/* err = -EADDRNOTAVAIL */
419 
420 		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
421 		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
422 			leavegroup = 1;
423 			goto done;
424 		}
425 
426 		/* update the interface filter */
427 		ip6_mc_del_src(idev, group, omode, 1, source, 1);
428 
429 		for (j=i+1; j<psl->sl_count; j++)
430 			psl->sl_addr[j-1] = psl->sl_addr[j];
431 		psl->sl_count--;
432 		err = 0;
433 		goto done;
434 	}
435 	/* else, add a new source to the filter */
436 
437 	if (psl && psl->sl_count >= sysctl_mld_max_msf) {
438 		err = -ENOBUFS;
439 		goto done;
440 	}
441 	if (!psl || psl->sl_count == psl->sl_max) {
442 		struct ip6_sf_socklist *newpsl;
443 		int count = IP6_SFBLOCK;
444 
445 		if (psl)
446 			count += psl->sl_max;
447 		newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
448 			IP6_SFLSIZE(count), GFP_ATOMIC);
449 		if (!newpsl) {
450 			err = -ENOBUFS;
451 			goto done;
452 		}
453 		newpsl->sl_max = count;
454 		newpsl->sl_count = count - IP6_SFBLOCK;
455 		if (psl) {
456 			for (i=0; i<psl->sl_count; i++)
457 				newpsl->sl_addr[i] = psl->sl_addr[i];
458 			sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
459 		}
460 		pmc->sflist = psl = newpsl;
461 	}
462 	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
463 	for (i=0; i<psl->sl_count; i++) {
464 		rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
465 		if (rv == 0)
466 			break;
467 	}
468 	if (rv == 0)		/* address already there is an error */
469 		goto done;
470 	for (j=psl->sl_count-1; j>=i; j--)
471 		psl->sl_addr[j+1] = psl->sl_addr[j];
472 	psl->sl_addr[i] = *source;
473 	psl->sl_count++;
474 	err = 0;
475 	/* update the interface list */
476 	ip6_mc_add_src(idev, group, omode, 1, source, 1);
477 done:
478 	read_unlock_bh(&ipv6_sk_mc_lock);
479 	read_unlock_bh(&idev->lock);
480 	in6_dev_put(idev);
481 	dev_put(dev);
482 	if (leavegroup)
483 		return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
484 	return err;
485 }
486 
487 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
488 {
489 	struct in6_addr *group;
490 	struct ipv6_mc_socklist *pmc;
491 	struct net_device *dev;
492 	struct inet6_dev *idev;
493 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
494 	struct ip6_sf_socklist *newpsl, *psl;
495 	int leavegroup = 0;
496 	int i, err;
497 
498 	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
499 
500 	if (!ipv6_addr_is_multicast(group))
501 		return -EINVAL;
502 	if (gsf->gf_fmode != MCAST_INCLUDE &&
503 	    gsf->gf_fmode != MCAST_EXCLUDE)
504 		return -EINVAL;
505 
506 	idev = ip6_mc_find_dev(group, gsf->gf_interface);
507 
508 	if (!idev)
509 		return -ENODEV;
510 	dev = idev->dev;
511 
512 	err = 0;
513 	if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
514 		leavegroup = 1;
515 		goto done;
516 	}
517 
518 	for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
519 		if (pmc->ifindex != gsf->gf_interface)
520 			continue;
521 		if (ipv6_addr_equal(&pmc->addr, group))
522 			break;
523 	}
524 	if (!pmc) {		/* must have a prior join */
525 		err = -EINVAL;
526 		goto done;
527 	}
528 	if (gsf->gf_numsrc) {
529 		newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
530 				IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
531 		if (!newpsl) {
532 			err = -ENOBUFS;
533 			goto done;
534 		}
535 		newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
536 		for (i=0; i<newpsl->sl_count; ++i) {
537 			struct sockaddr_in6 *psin6;
538 
539 			psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
540 			newpsl->sl_addr[i] = psin6->sin6_addr;
541 		}
542 		err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
543 			newpsl->sl_count, newpsl->sl_addr, 0);
544 		if (err) {
545 			sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
546 			goto done;
547 		}
548 	} else {
549 		newpsl = NULL;
550 		(void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
551 	}
552 	psl = pmc->sflist;
553 	if (psl) {
554 		(void) ip6_mc_del_src(idev, group, pmc->sfmode,
555 			psl->sl_count, psl->sl_addr, 0);
556 		sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
557 	} else
558 		(void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
559 	pmc->sflist = newpsl;
560 	pmc->sfmode = gsf->gf_fmode;
561 	err = 0;
562 done:
563 	read_unlock_bh(&idev->lock);
564 	in6_dev_put(idev);
565 	dev_put(dev);
566 	if (leavegroup)
567 		err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
568 	return err;
569 }
570 
571 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
572 	struct group_filter __user *optval, int __user *optlen)
573 {
574 	int err, i, count, copycount;
575 	struct in6_addr *group;
576 	struct ipv6_mc_socklist *pmc;
577 	struct inet6_dev *idev;
578 	struct net_device *dev;
579 	struct ipv6_pinfo *inet6 = inet6_sk(sk);
580 	struct ip6_sf_socklist *psl;
581 
582 	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
583 
584 	if (!ipv6_addr_is_multicast(group))
585 		return -EINVAL;
586 
587 	idev = ip6_mc_find_dev(group, gsf->gf_interface);
588 
589 	if (!idev)
590 		return -ENODEV;
591 
592 	dev = idev->dev;
593 
594 	err = -EADDRNOTAVAIL;
595 
596 	for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
597 		if (pmc->ifindex != gsf->gf_interface)
598 			continue;
599 		if (ipv6_addr_equal(group, &pmc->addr))
600 			break;
601 	}
602 	if (!pmc)		/* must have a prior join */
603 		goto done;
604 	gsf->gf_fmode = pmc->sfmode;
605 	psl = pmc->sflist;
606 	count = psl ? psl->sl_count : 0;
607 	read_unlock_bh(&idev->lock);
608 	in6_dev_put(idev);
609 	dev_put(dev);
610 
611 	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
612 	gsf->gf_numsrc = count;
613 	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
614 	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
615 		return -EFAULT;
616 	}
617 	for (i=0; i<copycount; i++) {
618 		struct sockaddr_in6 *psin6;
619 		struct sockaddr_storage ss;
620 
621 		psin6 = (struct sockaddr_in6 *)&ss;
622 		memset(&ss, 0, sizeof(ss));
623 		psin6->sin6_family = AF_INET6;
624 		psin6->sin6_addr = psl->sl_addr[i];
625 	    	if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
626 			return -EFAULT;
627 	}
628 	return 0;
629 done:
630 	read_unlock_bh(&idev->lock);
631 	in6_dev_put(idev);
632 	dev_put(dev);
633 	return err;
634 }
635 
636 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
637 	struct in6_addr *src_addr)
638 {
639 	struct ipv6_pinfo *np = inet6_sk(sk);
640 	struct ipv6_mc_socklist *mc;
641 	struct ip6_sf_socklist *psl;
642 	int rv = 1;
643 
644 	read_lock(&ipv6_sk_mc_lock);
645 	for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
646 		if (ipv6_addr_equal(&mc->addr, mc_addr))
647 			break;
648 	}
649 	if (!mc) {
650 		read_unlock(&ipv6_sk_mc_lock);
651 		return 1;
652 	}
653 	psl = mc->sflist;
654 	if (!psl) {
655 		rv = mc->sfmode == MCAST_EXCLUDE;
656 	} else {
657 		int i;
658 
659 		for (i=0; i<psl->sl_count; i++) {
660 			if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
661 				break;
662 		}
663 		if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
664 			rv = 0;
665 		if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
666 			rv = 0;
667 	}
668 	read_unlock(&ipv6_sk_mc_lock);
669 
670 	return rv;
671 }
672 
673 static void ma_put(struct ifmcaddr6 *mc)
674 {
675 	if (atomic_dec_and_test(&mc->mca_refcnt)) {
676 		in6_dev_put(mc->idev);
677 		kfree(mc);
678 	}
679 }
680 
681 static void igmp6_group_added(struct ifmcaddr6 *mc)
682 {
683 	struct net_device *dev = mc->idev->dev;
684 	char buf[MAX_ADDR_LEN];
685 
686 	spin_lock_bh(&mc->mca_lock);
687 	if (!(mc->mca_flags&MAF_LOADED)) {
688 		mc->mca_flags |= MAF_LOADED;
689 		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
690 			dev_mc_add(dev, buf, dev->addr_len, 0);
691 	}
692 	spin_unlock_bh(&mc->mca_lock);
693 
694 	if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
695 		return;
696 
697 	if (MLD_V1_SEEN(mc->idev)) {
698 		igmp6_join_group(mc);
699 		return;
700 	}
701 	/* else v2 */
702 
703 	mc->mca_crcount = mc->idev->mc_qrv;
704 	mld_ifc_event(mc->idev);
705 }
706 
707 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
708 {
709 	struct net_device *dev = mc->idev->dev;
710 	char buf[MAX_ADDR_LEN];
711 
712 	spin_lock_bh(&mc->mca_lock);
713 	if (mc->mca_flags&MAF_LOADED) {
714 		mc->mca_flags &= ~MAF_LOADED;
715 		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
716 			dev_mc_delete(dev, buf, dev->addr_len, 0);
717 	}
718 
719 	if (mc->mca_flags & MAF_NOREPORT)
720 		goto done;
721 	spin_unlock_bh(&mc->mca_lock);
722 
723 	if (!mc->idev->dead)
724 		igmp6_leave_group(mc);
725 
726 	spin_lock_bh(&mc->mca_lock);
727 	if (del_timer(&mc->mca_timer))
728 		atomic_dec(&mc->mca_refcnt);
729 done:
730 	ip6_mc_clear_src(mc);
731 	spin_unlock_bh(&mc->mca_lock);
732 }
733 
734 /*
735  * deleted ifmcaddr6 manipulation
736  */
737 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
738 {
739 	struct ifmcaddr6 *pmc;
740 
741 	/* this is an "ifmcaddr6" for convenience; only the fields below
742 	 * are actually used. In particular, the refcnt and users are not
743 	 * used for management of the delete list. Using the same structure
744 	 * for deleted items allows change reports to use common code with
745 	 * non-deleted or query-response MCA's.
746 	 */
747 	pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
748 	if (!pmc)
749 		return;
750 	memset(pmc, 0, sizeof(*pmc));
751 	spin_lock_bh(&im->mca_lock);
752 	spin_lock_init(&pmc->mca_lock);
753 	pmc->idev = im->idev;
754 	in6_dev_hold(idev);
755 	pmc->mca_addr = im->mca_addr;
756 	pmc->mca_crcount = idev->mc_qrv;
757 	pmc->mca_sfmode = im->mca_sfmode;
758 	if (pmc->mca_sfmode == MCAST_INCLUDE) {
759 		struct ip6_sf_list *psf;
760 
761 		pmc->mca_tomb = im->mca_tomb;
762 		pmc->mca_sources = im->mca_sources;
763 		im->mca_tomb = im->mca_sources = NULL;
764 		for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
765 			psf->sf_crcount = pmc->mca_crcount;
766 	}
767 	spin_unlock_bh(&im->mca_lock);
768 
769 	write_lock_bh(&idev->mc_lock);
770 	pmc->next = idev->mc_tomb;
771 	idev->mc_tomb = pmc;
772 	write_unlock_bh(&idev->mc_lock);
773 }
774 
775 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
776 {
777 	struct ifmcaddr6 *pmc, *pmc_prev;
778 	struct ip6_sf_list *psf, *psf_next;
779 
780 	write_lock_bh(&idev->mc_lock);
781 	pmc_prev = NULL;
782 	for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
783 		if (ipv6_addr_equal(&pmc->mca_addr, pmca))
784 			break;
785 		pmc_prev = pmc;
786 	}
787 	if (pmc) {
788 		if (pmc_prev)
789 			pmc_prev->next = pmc->next;
790 		else
791 			idev->mc_tomb = pmc->next;
792 	}
793 	write_unlock_bh(&idev->mc_lock);
794 	if (pmc) {
795 		for (psf=pmc->mca_tomb; psf; psf=psf_next) {
796 			psf_next = psf->sf_next;
797 			kfree(psf);
798 		}
799 		in6_dev_put(pmc->idev);
800 		kfree(pmc);
801 	}
802 }
803 
804 static void mld_clear_delrec(struct inet6_dev *idev)
805 {
806 	struct ifmcaddr6 *pmc, *nextpmc;
807 
808 	write_lock_bh(&idev->mc_lock);
809 	pmc = idev->mc_tomb;
810 	idev->mc_tomb = NULL;
811 	write_unlock_bh(&idev->mc_lock);
812 
813 	for (; pmc; pmc = nextpmc) {
814 		nextpmc = pmc->next;
815 		ip6_mc_clear_src(pmc);
816 		in6_dev_put(pmc->idev);
817 		kfree(pmc);
818 	}
819 
820 	/* clear dead sources, too */
821 	read_lock_bh(&idev->lock);
822 	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
823 		struct ip6_sf_list *psf, *psf_next;
824 
825 		spin_lock_bh(&pmc->mca_lock);
826 		psf = pmc->mca_tomb;
827 		pmc->mca_tomb = NULL;
828 		spin_unlock_bh(&pmc->mca_lock);
829 		for (; psf; psf=psf_next) {
830 			psf_next = psf->sf_next;
831 			kfree(psf);
832 		}
833 	}
834 	read_unlock_bh(&idev->lock);
835 }
836 
837 
838 /*
839  *	device multicast group inc (add if not found)
840  */
841 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
842 {
843 	struct ifmcaddr6 *mc;
844 	struct inet6_dev *idev;
845 
846 	idev = in6_dev_get(dev);
847 
848 	if (idev == NULL)
849 		return -EINVAL;
850 
851 	write_lock_bh(&idev->lock);
852 	if (idev->dead) {
853 		write_unlock_bh(&idev->lock);
854 		in6_dev_put(idev);
855 		return -ENODEV;
856 	}
857 
858 	for (mc = idev->mc_list; mc; mc = mc->next) {
859 		if (ipv6_addr_equal(&mc->mca_addr, addr)) {
860 			mc->mca_users++;
861 			write_unlock_bh(&idev->lock);
862 			ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
863 				NULL, 0);
864 			in6_dev_put(idev);
865 			return 0;
866 		}
867 	}
868 
869 	/*
870 	 *	not found: create a new one.
871 	 */
872 
873 	mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
874 
875 	if (mc == NULL) {
876 		write_unlock_bh(&idev->lock);
877 		in6_dev_put(idev);
878 		return -ENOMEM;
879 	}
880 
881 	memset(mc, 0, sizeof(struct ifmcaddr6));
882 	init_timer(&mc->mca_timer);
883 	mc->mca_timer.function = igmp6_timer_handler;
884 	mc->mca_timer.data = (unsigned long) mc;
885 
886 	ipv6_addr_copy(&mc->mca_addr, addr);
887 	mc->idev = idev;
888 	mc->mca_users = 1;
889 	/* mca_stamp should be updated upon changes */
890 	mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 	atomic_set(&mc->mca_refcnt, 2);
892 	spin_lock_init(&mc->mca_lock);
893 
894 	/* initial mode is (EX, empty) */
895 	mc->mca_sfmode = MCAST_EXCLUDE;
896 	mc->mca_sfcount[MCAST_EXCLUDE] = 1;
897 
898 	if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
899 	    IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
900 		mc->mca_flags |= MAF_NOREPORT;
901 
902 	mc->next = idev->mc_list;
903 	idev->mc_list = mc;
904 	write_unlock_bh(&idev->lock);
905 
906 	mld_del_delrec(idev, &mc->mca_addr);
907 	igmp6_group_added(mc);
908 	ma_put(mc);
909 	return 0;
910 }
911 
912 /*
913  *	device multicast group del
914  */
915 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
916 {
917 	struct ifmcaddr6 *ma, **map;
918 
919 	write_lock_bh(&idev->lock);
920 	for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
921 		if (ipv6_addr_equal(&ma->mca_addr, addr)) {
922 			if (--ma->mca_users == 0) {
923 				*map = ma->next;
924 				write_unlock_bh(&idev->lock);
925 
926 				igmp6_group_dropped(ma);
927 
928 				ma_put(ma);
929 				return 0;
930 			}
931 			write_unlock_bh(&idev->lock);
932 			return 0;
933 		}
934 	}
935 	write_unlock_bh(&idev->lock);
936 
937 	return -ENOENT;
938 }
939 
940 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
941 {
942 	struct inet6_dev *idev = in6_dev_get(dev);
943 	int err;
944 
945 	if (!idev)
946 		return -ENODEV;
947 
948 	err = __ipv6_dev_mc_dec(idev, addr);
949 
950 	in6_dev_put(idev);
951 
952 	return err;
953 }
954 
955 /*
956  * identify MLD packets for MLD filter exceptions
957  */
958 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
959 {
960 	struct icmp6hdr *pic;
961 
962 	if (nexthdr != IPPROTO_ICMPV6)
963 		return 0;
964 
965 	if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
966 		return 0;
967 
968 	pic = (struct icmp6hdr *)skb->h.raw;
969 
970 	switch (pic->icmp6_type) {
971 	case ICMPV6_MGM_QUERY:
972 	case ICMPV6_MGM_REPORT:
973 	case ICMPV6_MGM_REDUCTION:
974 	case ICMPV6_MLD2_REPORT:
975 		return 1;
976 	default:
977 		break;
978 	}
979 	return 0;
980 }
981 
982 /*
983  *	check if the interface/address pair is valid
984  */
985 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
986 	struct in6_addr *src_addr)
987 {
988 	struct inet6_dev *idev;
989 	struct ifmcaddr6 *mc;
990 	int rv = 0;
991 
992 	idev = in6_dev_get(dev);
993 	if (idev) {
994 		read_lock_bh(&idev->lock);
995 		for (mc = idev->mc_list; mc; mc=mc->next) {
996 			if (ipv6_addr_equal(&mc->mca_addr, group))
997 				break;
998 		}
999 		if (mc) {
1000 			if (src_addr && !ipv6_addr_any(src_addr)) {
1001 				struct ip6_sf_list *psf;
1002 
1003 				spin_lock_bh(&mc->mca_lock);
1004 				for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1005 					if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1006 						break;
1007 				}
1008 				if (psf)
1009 					rv = psf->sf_count[MCAST_INCLUDE] ||
1010 						psf->sf_count[MCAST_EXCLUDE] !=
1011 						mc->mca_sfcount[MCAST_EXCLUDE];
1012 				else
1013 					rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1014 				spin_unlock_bh(&mc->mca_lock);
1015 			} else
1016 				rv = 1; /* don't filter unspecified source */
1017 		}
1018 		read_unlock_bh(&idev->lock);
1019 		in6_dev_put(idev);
1020 	}
1021 	return rv;
1022 }
1023 
1024 static void mld_gq_start_timer(struct inet6_dev *idev)
1025 {
1026 	int tv = net_random() % idev->mc_maxdelay;
1027 
1028 	idev->mc_gq_running = 1;
1029 	if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1030 		in6_dev_hold(idev);
1031 }
1032 
1033 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1034 {
1035 	int tv = net_random() % delay;
1036 
1037 	if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1038 		in6_dev_hold(idev);
1039 }
1040 
1041 /*
1042  *	IGMP handling (alias multicast ICMPv6 messages)
1043  */
1044 
1045 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1046 {
1047 	unsigned long delay = resptime;
1048 
1049 	/* Do not start timer for these addresses */
1050 	if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1051 	    IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1052 		return;
1053 
1054 	if (del_timer(&ma->mca_timer)) {
1055 		atomic_dec(&ma->mca_refcnt);
1056 		delay = ma->mca_timer.expires - jiffies;
1057 	}
1058 
1059 	if (delay >= resptime) {
1060 		if (resptime)
1061 			delay = net_random() % resptime;
1062 		else
1063 			delay = 1;
1064 	}
1065 	ma->mca_timer.expires = jiffies + delay;
1066 	if (!mod_timer(&ma->mca_timer, jiffies + delay))
1067 		atomic_inc(&ma->mca_refcnt);
1068 	ma->mca_flags |= MAF_TIMER_RUNNING;
1069 }
1070 
1071 static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1072 	struct in6_addr *srcs)
1073 {
1074 	struct ip6_sf_list *psf;
1075 	int i, scount;
1076 
1077 	scount = 0;
1078 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1079 		if (scount == nsrcs)
1080 			break;
1081 		for (i=0; i<nsrcs; i++)
1082 			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1083 				psf->sf_gsresp = 1;
1084 				scount++;
1085 				break;
1086 			}
1087 	}
1088 }
1089 
1090 int igmp6_event_query(struct sk_buff *skb)
1091 {
1092 	struct mld2_query *mlh2 = NULL;
1093 	struct ifmcaddr6 *ma;
1094 	struct in6_addr *group;
1095 	unsigned long max_delay;
1096 	struct inet6_dev *idev;
1097 	struct icmp6hdr *hdr;
1098 	int group_type;
1099 	int mark = 0;
1100 	int len;
1101 
1102 	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1103 		return -EINVAL;
1104 
1105 	/* compute payload length excluding extension headers */
1106 	len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1107 	len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1108 
1109 	/* Drop queries with not link local source */
1110 	if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1111 		return -EINVAL;
1112 
1113 	idev = in6_dev_get(skb->dev);
1114 
1115 	if (idev == NULL)
1116 		return 0;
1117 
1118 	hdr = (struct icmp6hdr *) skb->h.raw;
1119 	group = (struct in6_addr *) (hdr + 1);
1120 	group_type = ipv6_addr_type(group);
1121 
1122 	if (group_type != IPV6_ADDR_ANY &&
1123 	    !(group_type&IPV6_ADDR_MULTICAST)) {
1124 		in6_dev_put(idev);
1125 		return -EINVAL;
1126 	}
1127 
1128 	if (len == 24) {
1129 		int switchback;
1130 		/* MLDv1 router present */
1131 
1132 		/* Translate milliseconds to jiffies */
1133 		max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1134 
1135 		switchback = (idev->mc_qrv + 1) * max_delay;
1136 		idev->mc_v1_seen = jiffies + switchback;
1137 
1138 		/* cancel the interface change timer */
1139 		idev->mc_ifc_count = 0;
1140 		if (del_timer(&idev->mc_ifc_timer))
1141 			__in6_dev_put(idev);
1142 		/* clear deleted report items */
1143 		mld_clear_delrec(idev);
1144 	} else if (len >= 28) {
1145 		int srcs_offset = sizeof(struct mld2_query) -
1146 				  sizeof(struct icmp6hdr);
1147 		if (!pskb_may_pull(skb, srcs_offset)) {
1148 			in6_dev_put(idev);
1149 			return -EINVAL;
1150 		}
1151 		mlh2 = (struct mld2_query *) skb->h.raw;
1152 		max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1153 		if (!max_delay)
1154 			max_delay = 1;
1155 		idev->mc_maxdelay = max_delay;
1156 		if (mlh2->qrv)
1157 			idev->mc_qrv = mlh2->qrv;
1158 		if (group_type == IPV6_ADDR_ANY) { /* general query */
1159 			if (mlh2->nsrcs) {
1160 				in6_dev_put(idev);
1161 				return -EINVAL; /* no sources allowed */
1162 			}
1163 			mld_gq_start_timer(idev);
1164 			in6_dev_put(idev);
1165 			return 0;
1166 		}
1167 		/* mark sources to include, if group & source-specific */
1168 		if (mlh2->nsrcs != 0) {
1169 			if (!pskb_may_pull(skb, srcs_offset +
1170 				mlh2->nsrcs * sizeof(struct in6_addr))) {
1171 				in6_dev_put(idev);
1172 				return -EINVAL;
1173 			}
1174 			mlh2 = (struct mld2_query *) skb->h.raw;
1175 			mark = 1;
1176 		}
1177 	} else {
1178 		in6_dev_put(idev);
1179 		return -EINVAL;
1180 	}
1181 
1182 	read_lock_bh(&idev->lock);
1183 	if (group_type == IPV6_ADDR_ANY) {
1184 		for (ma = idev->mc_list; ma; ma=ma->next) {
1185 			spin_lock_bh(&ma->mca_lock);
1186 			igmp6_group_queried(ma, max_delay);
1187 			spin_unlock_bh(&ma->mca_lock);
1188 		}
1189 	} else {
1190 		for (ma = idev->mc_list; ma; ma=ma->next) {
1191 			if (group_type != IPV6_ADDR_ANY &&
1192 			    !ipv6_addr_equal(group, &ma->mca_addr))
1193 				continue;
1194 			spin_lock_bh(&ma->mca_lock);
1195 			if (ma->mca_flags & MAF_TIMER_RUNNING) {
1196 				/* gsquery <- gsquery && mark */
1197 				if (!mark)
1198 					ma->mca_flags &= ~MAF_GSQUERY;
1199 			} else {
1200 				/* gsquery <- mark */
1201 				if (mark)
1202 					ma->mca_flags |= MAF_GSQUERY;
1203 				else
1204 					ma->mca_flags &= ~MAF_GSQUERY;
1205 			}
1206 			if (ma->mca_flags & MAF_GSQUERY)
1207 				mld_marksources(ma, ntohs(mlh2->nsrcs),
1208 					mlh2->srcs);
1209 			igmp6_group_queried(ma, max_delay);
1210 			spin_unlock_bh(&ma->mca_lock);
1211 			if (group_type != IPV6_ADDR_ANY)
1212 				break;
1213 		}
1214 	}
1215 	read_unlock_bh(&idev->lock);
1216 	in6_dev_put(idev);
1217 
1218 	return 0;
1219 }
1220 
1221 
1222 int igmp6_event_report(struct sk_buff *skb)
1223 {
1224 	struct ifmcaddr6 *ma;
1225 	struct in6_addr *addrp;
1226 	struct inet6_dev *idev;
1227 	struct icmp6hdr *hdr;
1228 	int addr_type;
1229 
1230 	/* Our own report looped back. Ignore it. */
1231 	if (skb->pkt_type == PACKET_LOOPBACK)
1232 		return 0;
1233 
1234 	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1235 		return -EINVAL;
1236 
1237 	hdr = (struct icmp6hdr*) skb->h.raw;
1238 
1239 	/* Drop reports with not link local source */
1240 	addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1241 	if (addr_type != IPV6_ADDR_ANY &&
1242 	    !(addr_type&IPV6_ADDR_LINKLOCAL))
1243 		return -EINVAL;
1244 
1245 	addrp = (struct in6_addr *) (hdr + 1);
1246 
1247 	idev = in6_dev_get(skb->dev);
1248 	if (idev == NULL)
1249 		return -ENODEV;
1250 
1251 	/*
1252 	 *	Cancel the timer for this group
1253 	 */
1254 
1255 	read_lock_bh(&idev->lock);
1256 	for (ma = idev->mc_list; ma; ma=ma->next) {
1257 		if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1258 			spin_lock(&ma->mca_lock);
1259 			if (del_timer(&ma->mca_timer))
1260 				atomic_dec(&ma->mca_refcnt);
1261 			ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1262 			spin_unlock(&ma->mca_lock);
1263 			break;
1264 		}
1265 	}
1266 	read_unlock_bh(&idev->lock);
1267 	in6_dev_put(idev);
1268 	return 0;
1269 }
1270 
1271 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1272 	int gdeleted, int sdeleted)
1273 {
1274 	switch (type) {
1275 	case MLD2_MODE_IS_INCLUDE:
1276 	case MLD2_MODE_IS_EXCLUDE:
1277 		if (gdeleted || sdeleted)
1278 			return 0;
1279 		return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
1280 	case MLD2_CHANGE_TO_INCLUDE:
1281 		if (gdeleted || sdeleted)
1282 			return 0;
1283 		return psf->sf_count[MCAST_INCLUDE] != 0;
1284 	case MLD2_CHANGE_TO_EXCLUDE:
1285 		if (gdeleted || sdeleted)
1286 			return 0;
1287 		if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1288 		    psf->sf_count[MCAST_INCLUDE])
1289 			return 0;
1290 		return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1291 			psf->sf_count[MCAST_EXCLUDE];
1292 	case MLD2_ALLOW_NEW_SOURCES:
1293 		if (gdeleted || !psf->sf_crcount)
1294 			return 0;
1295 		return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1296 	case MLD2_BLOCK_OLD_SOURCES:
1297 		if (pmc->mca_sfmode == MCAST_INCLUDE)
1298 			return gdeleted || (psf->sf_crcount && sdeleted);
1299 		return psf->sf_crcount && !gdeleted && !sdeleted;
1300 	}
1301 	return 0;
1302 }
1303 
1304 static int
1305 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1306 {
1307 	struct ip6_sf_list *psf;
1308 	int scount = 0;
1309 
1310 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1311 		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1312 			continue;
1313 		scount++;
1314 	}
1315 	return scount;
1316 }
1317 
1318 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1319 {
1320 	struct sock *sk = igmp6_socket->sk;
1321 	struct sk_buff *skb;
1322 	struct mld2_report *pmr;
1323 	struct in6_addr addr_buf;
1324 	int err;
1325 	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1326 		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1327 		     IPV6_TLV_PADN, 0 };
1328 
1329 	/* we assume size > sizeof(ra) here */
1330 	skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1331 
1332 	if (skb == 0)
1333 		return NULL;
1334 
1335 	skb_reserve(skb, LL_RESERVED_SPACE(dev));
1336 
1337 	if (ipv6_get_lladdr(dev, &addr_buf)) {
1338 		/* <draft-ietf-magma-mld-source-05.txt>:
1339 		 * use unspecified address as the source address
1340 		 * when a valid link-local address is not available.
1341 		 */
1342 		memset(&addr_buf, 0, sizeof(addr_buf));
1343 	}
1344 
1345 	ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1346 
1347 	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1348 
1349 	pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1350 	skb->h.raw = (unsigned char *)pmr;
1351 	pmr->type = ICMPV6_MLD2_REPORT;
1352 	pmr->resv1 = 0;
1353 	pmr->csum = 0;
1354 	pmr->resv2 = 0;
1355 	pmr->ngrec = 0;
1356 	return skb;
1357 }
1358 
1359 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1360 {
1361 	struct net_device *dev = skb->dev;
1362 
1363 	if (dev->hard_header) {
1364 		unsigned char ha[MAX_ADDR_LEN];
1365 		int err;
1366 
1367 		ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1368 		err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1369 		if (err < 0) {
1370 			kfree_skb(skb);
1371 			return err;
1372 		}
1373 	}
1374 	return dev_queue_xmit(skb);
1375 }
1376 
1377 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1378 {
1379 	return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1380 	               mld_dev_queue_xmit2);
1381 }
1382 
1383 static void mld_sendpack(struct sk_buff *skb)
1384 {
1385 	struct ipv6hdr *pip6 = skb->nh.ipv6h;
1386 	struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1387 	int payload_len, mldlen;
1388 	struct inet6_dev *idev = in6_dev_get(skb->dev);
1389 	int err;
1390 
1391 	IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1392 	payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1393 		sizeof(struct ipv6hdr);
1394 	mldlen = skb->tail - skb->h.raw;
1395 	pip6->payload_len = htons(payload_len);
1396 
1397 	pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1398 		IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1399 	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1400 		mld_dev_queue_xmit);
1401 	if (!err) {
1402 		ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1403 		IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1404 	} else
1405 		IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1406 
1407 	if (likely(idev != NULL))
1408 		in6_dev_put(idev);
1409 }
1410 
1411 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1412 {
1413 	return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1414 }
1415 
1416 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1417 	int type, struct mld2_grec **ppgr)
1418 {
1419 	struct net_device *dev = pmc->idev->dev;
1420 	struct mld2_report *pmr;
1421 	struct mld2_grec *pgr;
1422 
1423 	if (!skb)
1424 		skb = mld_newpack(dev, dev->mtu);
1425 	if (!skb)
1426 		return NULL;
1427 	pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1428 	pgr->grec_type = type;
1429 	pgr->grec_auxwords = 0;
1430 	pgr->grec_nsrcs = 0;
1431 	pgr->grec_mca = pmc->mca_addr;	/* structure copy */
1432 	pmr = (struct mld2_report *)skb->h.raw;
1433 	pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1434 	*ppgr = pgr;
1435 	return skb;
1436 }
1437 
1438 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1439 	skb_tailroom(skb)) : 0)
1440 
1441 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1442 	int type, int gdeleted, int sdeleted)
1443 {
1444 	struct net_device *dev = pmc->idev->dev;
1445 	struct mld2_report *pmr;
1446 	struct mld2_grec *pgr = NULL;
1447 	struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1448 	int scount, first, isquery, truncate;
1449 
1450 	if (pmc->mca_flags & MAF_NOREPORT)
1451 		return skb;
1452 
1453 	isquery = type == MLD2_MODE_IS_INCLUDE ||
1454 		  type == MLD2_MODE_IS_EXCLUDE;
1455 	truncate = type == MLD2_MODE_IS_EXCLUDE ||
1456 		    type == MLD2_CHANGE_TO_EXCLUDE;
1457 
1458 	psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1459 
1460 	if (!*psf_list) {
1461 		if (type == MLD2_ALLOW_NEW_SOURCES ||
1462 		    type == MLD2_BLOCK_OLD_SOURCES)
1463 			return skb;
1464 		if (pmc->mca_crcount || isquery) {
1465 			/* make sure we have room for group header and at
1466 			 * least one source.
1467 			 */
1468 			if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
1469 			    sizeof(struct in6_addr)) {
1470 				mld_sendpack(skb);
1471 				skb = NULL; /* add_grhead will get a new one */
1472 			}
1473 			skb = add_grhead(skb, pmc, type, &pgr);
1474 		}
1475 		return skb;
1476 	}
1477 	pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1478 
1479 	/* EX and TO_EX get a fresh packet, if needed */
1480 	if (truncate) {
1481 		if (pmr && pmr->ngrec &&
1482 		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1483 			if (skb)
1484 				mld_sendpack(skb);
1485 			skb = mld_newpack(dev, dev->mtu);
1486 		}
1487 	}
1488 	first = 1;
1489 	scount = 0;
1490 	psf_prev = NULL;
1491 	for (psf=*psf_list; psf; psf=psf_next) {
1492 		struct in6_addr *psrc;
1493 
1494 		psf_next = psf->sf_next;
1495 
1496 		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1497 			psf_prev = psf;
1498 			continue;
1499 		}
1500 
1501 		/* clear marks on query responses */
1502 		if (isquery)
1503 			psf->sf_gsresp = 0;
1504 
1505 		if (AVAILABLE(skb) < sizeof(*psrc) +
1506 		    first*sizeof(struct mld2_grec)) {
1507 			if (truncate && !first)
1508 				break;	 /* truncate these */
1509 			if (pgr)
1510 				pgr->grec_nsrcs = htons(scount);
1511 			if (skb)
1512 				mld_sendpack(skb);
1513 			skb = mld_newpack(dev, dev->mtu);
1514 			first = 1;
1515 			scount = 0;
1516 		}
1517 		if (first) {
1518 			skb = add_grhead(skb, pmc, type, &pgr);
1519 			first = 0;
1520 		}
1521 		psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1522 		*psrc = psf->sf_addr;
1523 		scount++;
1524 		if ((type == MLD2_ALLOW_NEW_SOURCES ||
1525 		     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1526 			psf->sf_crcount--;
1527 			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1528 				if (psf_prev)
1529 					psf_prev->sf_next = psf->sf_next;
1530 				else
1531 					*psf_list = psf->sf_next;
1532 				kfree(psf);
1533 				continue;
1534 			}
1535 		}
1536 		psf_prev = psf;
1537 	}
1538 	if (pgr)
1539 		pgr->grec_nsrcs = htons(scount);
1540 
1541 	if (isquery)
1542 		pmc->mca_flags &= ~MAF_GSQUERY;	/* clear query state */
1543 	return skb;
1544 }
1545 
1546 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1547 {
1548 	struct sk_buff *skb = NULL;
1549 	int type;
1550 
1551 	if (!pmc) {
1552 		read_lock_bh(&idev->lock);
1553 		for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1554 			if (pmc->mca_flags & MAF_NOREPORT)
1555 				continue;
1556 			spin_lock_bh(&pmc->mca_lock);
1557 			if (pmc->mca_sfcount[MCAST_EXCLUDE])
1558 				type = MLD2_MODE_IS_EXCLUDE;
1559 			else
1560 				type = MLD2_MODE_IS_INCLUDE;
1561 			skb = add_grec(skb, pmc, type, 0, 0);
1562 			spin_unlock_bh(&pmc->mca_lock);
1563 		}
1564 		read_unlock_bh(&idev->lock);
1565 	} else {
1566 		spin_lock_bh(&pmc->mca_lock);
1567 		if (pmc->mca_sfcount[MCAST_EXCLUDE])
1568 			type = MLD2_MODE_IS_EXCLUDE;
1569 		else
1570 			type = MLD2_MODE_IS_INCLUDE;
1571 		skb = add_grec(skb, pmc, type, 0, 0);
1572 		spin_unlock_bh(&pmc->mca_lock);
1573 	}
1574 	if (skb)
1575 		mld_sendpack(skb);
1576 }
1577 
1578 /*
1579  * remove zero-count source records from a source filter list
1580  */
1581 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1582 {
1583 	struct ip6_sf_list *psf_prev, *psf_next, *psf;
1584 
1585 	psf_prev = NULL;
1586 	for (psf=*ppsf; psf; psf = psf_next) {
1587 		psf_next = psf->sf_next;
1588 		if (psf->sf_crcount == 0) {
1589 			if (psf_prev)
1590 				psf_prev->sf_next = psf->sf_next;
1591 			else
1592 				*ppsf = psf->sf_next;
1593 			kfree(psf);
1594 		} else
1595 			psf_prev = psf;
1596 	}
1597 }
1598 
1599 static void mld_send_cr(struct inet6_dev *idev)
1600 {
1601 	struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1602 	struct sk_buff *skb = NULL;
1603 	int type, dtype;
1604 
1605 	read_lock_bh(&idev->lock);
1606 	write_lock_bh(&idev->mc_lock);
1607 
1608 	/* deleted MCA's */
1609 	pmc_prev = NULL;
1610 	for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1611 		pmc_next = pmc->next;
1612 		if (pmc->mca_sfmode == MCAST_INCLUDE) {
1613 			type = MLD2_BLOCK_OLD_SOURCES;
1614 			dtype = MLD2_BLOCK_OLD_SOURCES;
1615 			skb = add_grec(skb, pmc, type, 1, 0);
1616 			skb = add_grec(skb, pmc, dtype, 1, 1);
1617 		}
1618 		if (pmc->mca_crcount) {
1619 			pmc->mca_crcount--;
1620 			if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1621 				type = MLD2_CHANGE_TO_INCLUDE;
1622 				skb = add_grec(skb, pmc, type, 1, 0);
1623 			}
1624 			if (pmc->mca_crcount == 0) {
1625 				mld_clear_zeros(&pmc->mca_tomb);
1626 				mld_clear_zeros(&pmc->mca_sources);
1627 			}
1628 		}
1629 		if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1630 		    !pmc->mca_sources) {
1631 			if (pmc_prev)
1632 				pmc_prev->next = pmc_next;
1633 			else
1634 				idev->mc_tomb = pmc_next;
1635 			in6_dev_put(pmc->idev);
1636 			kfree(pmc);
1637 		} else
1638 			pmc_prev = pmc;
1639 	}
1640 	write_unlock_bh(&idev->mc_lock);
1641 
1642 	/* change recs */
1643 	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1644 		spin_lock_bh(&pmc->mca_lock);
1645 		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1646 			type = MLD2_BLOCK_OLD_SOURCES;
1647 			dtype = MLD2_ALLOW_NEW_SOURCES;
1648 		} else {
1649 			type = MLD2_ALLOW_NEW_SOURCES;
1650 			dtype = MLD2_BLOCK_OLD_SOURCES;
1651 		}
1652 		skb = add_grec(skb, pmc, type, 0, 0);
1653 		skb = add_grec(skb, pmc, dtype, 0, 1);	/* deleted sources */
1654 
1655 		/* filter mode changes */
1656 		if (pmc->mca_crcount) {
1657 			pmc->mca_crcount--;
1658 			if (pmc->mca_sfmode == MCAST_EXCLUDE)
1659 				type = MLD2_CHANGE_TO_EXCLUDE;
1660 			else
1661 				type = MLD2_CHANGE_TO_INCLUDE;
1662 			skb = add_grec(skb, pmc, type, 0, 0);
1663 		}
1664 		spin_unlock_bh(&pmc->mca_lock);
1665 	}
1666 	read_unlock_bh(&idev->lock);
1667 	if (!skb)
1668 		return;
1669 	(void) mld_sendpack(skb);
1670 }
1671 
1672 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1673 {
1674 	struct sock *sk = igmp6_socket->sk;
1675 	struct inet6_dev *idev;
1676         struct sk_buff *skb;
1677         struct icmp6hdr *hdr;
1678 	struct in6_addr *snd_addr;
1679 	struct in6_addr *addrp;
1680 	struct in6_addr addr_buf;
1681 	struct in6_addr all_routers;
1682 	int err, len, payload_len, full_len;
1683 	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1684 		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1685 		     IPV6_TLV_PADN, 0 };
1686 
1687 	IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1688 	snd_addr = addr;
1689 	if (type == ICMPV6_MGM_REDUCTION) {
1690 		snd_addr = &all_routers;
1691 		ipv6_addr_all_routers(&all_routers);
1692 	}
1693 
1694 	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1695 	payload_len = len + sizeof(ra);
1696 	full_len = sizeof(struct ipv6hdr) + payload_len;
1697 
1698 	skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1699 
1700 	if (skb == NULL) {
1701 		IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1702 		return;
1703 	}
1704 
1705 	skb_reserve(skb, LL_RESERVED_SPACE(dev));
1706 
1707 	if (ipv6_get_lladdr(dev, &addr_buf)) {
1708 		/* <draft-ietf-magma-mld-source-05.txt>:
1709 		 * use unspecified address as the source address
1710 		 * when a valid link-local address is not available.
1711 		 */
1712 		memset(&addr_buf, 0, sizeof(addr_buf));
1713 	}
1714 
1715 	ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1716 
1717 	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1718 
1719 	hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1720 	memset(hdr, 0, sizeof(struct icmp6hdr));
1721 	hdr->icmp6_type = type;
1722 
1723 	addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1724 	ipv6_addr_copy(addrp, addr);
1725 
1726 	hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1727 					   IPPROTO_ICMPV6,
1728 					   csum_partial((__u8 *) hdr, len, 0));
1729 
1730 	idev = in6_dev_get(skb->dev);
1731 
1732 	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1733 		mld_dev_queue_xmit);
1734 	if (!err) {
1735 		if (type == ICMPV6_MGM_REDUCTION)
1736 			ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1737 		else
1738 			ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1739 		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1740 		IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1741 	} else
1742 		IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1743 
1744 	if (likely(idev != NULL))
1745 		in6_dev_put(idev);
1746 	return;
1747 }
1748 
1749 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1750 	struct in6_addr *psfsrc)
1751 {
1752 	struct ip6_sf_list *psf, *psf_prev;
1753 	int rv = 0;
1754 
1755 	psf_prev = NULL;
1756 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1757 		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1758 			break;
1759 		psf_prev = psf;
1760 	}
1761 	if (!psf || psf->sf_count[sfmode] == 0) {
1762 		/* source filter not found, or count wrong =>  bug */
1763 		return -ESRCH;
1764 	}
1765 	psf->sf_count[sfmode]--;
1766 	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1767 		struct inet6_dev *idev = pmc->idev;
1768 
1769 		/* no more filters for this source */
1770 		if (psf_prev)
1771 			psf_prev->sf_next = psf->sf_next;
1772 		else
1773 			pmc->mca_sources = psf->sf_next;
1774 		if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1775 		    !MLD_V1_SEEN(idev)) {
1776 			psf->sf_crcount = idev->mc_qrv;
1777 			psf->sf_next = pmc->mca_tomb;
1778 			pmc->mca_tomb = psf;
1779 			rv = 1;
1780 		} else
1781 			kfree(psf);
1782 	}
1783 	return rv;
1784 }
1785 
1786 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1787 			  int sfmode, int sfcount, struct in6_addr *psfsrc,
1788 			  int delta)
1789 {
1790 	struct ifmcaddr6 *pmc;
1791 	int	changerec = 0;
1792 	int	i, err;
1793 
1794 	if (!idev)
1795 		return -ENODEV;
1796 	read_lock_bh(&idev->lock);
1797 	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1798 		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1799 			break;
1800 	}
1801 	if (!pmc) {
1802 		/* MCA not found?? bug */
1803 		read_unlock_bh(&idev->lock);
1804 		return -ESRCH;
1805 	}
1806 	spin_lock_bh(&pmc->mca_lock);
1807 	sf_markstate(pmc);
1808 	if (!delta) {
1809 		if (!pmc->mca_sfcount[sfmode]) {
1810 			spin_unlock_bh(&pmc->mca_lock);
1811 			read_unlock_bh(&idev->lock);
1812 			return -EINVAL;
1813 		}
1814 		pmc->mca_sfcount[sfmode]--;
1815 	}
1816 	err = 0;
1817 	for (i=0; i<sfcount; i++) {
1818 		int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1819 
1820 		changerec |= rv > 0;
1821 		if (!err && rv < 0)
1822 			err = rv;
1823 	}
1824 	if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1825 	    pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1826 	    pmc->mca_sfcount[MCAST_INCLUDE]) {
1827 		struct ip6_sf_list *psf;
1828 
1829 		/* filter mode change */
1830 		pmc->mca_sfmode = MCAST_INCLUDE;
1831 		pmc->mca_crcount = idev->mc_qrv;
1832 		idev->mc_ifc_count = pmc->mca_crcount;
1833 		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1834 			psf->sf_crcount = 0;
1835 		mld_ifc_event(pmc->idev);
1836 	} else if (sf_setstate(pmc) || changerec)
1837 		mld_ifc_event(pmc->idev);
1838 	spin_unlock_bh(&pmc->mca_lock);
1839 	read_unlock_bh(&idev->lock);
1840 	return err;
1841 }
1842 
1843 /*
1844  * Add multicast single-source filter to the interface list
1845  */
1846 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1847 	struct in6_addr *psfsrc, int delta)
1848 {
1849 	struct ip6_sf_list *psf, *psf_prev;
1850 
1851 	psf_prev = NULL;
1852 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1853 		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1854 			break;
1855 		psf_prev = psf;
1856 	}
1857 	if (!psf) {
1858 		psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1859 		if (!psf)
1860 			return -ENOBUFS;
1861 		memset(psf, 0, sizeof(*psf));
1862 		psf->sf_addr = *psfsrc;
1863 		if (psf_prev) {
1864 			psf_prev->sf_next = psf;
1865 		} else
1866 			pmc->mca_sources = psf;
1867 	}
1868 	psf->sf_count[sfmode]++;
1869 	return 0;
1870 }
1871 
1872 static void sf_markstate(struct ifmcaddr6 *pmc)
1873 {
1874 	struct ip6_sf_list *psf;
1875 	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1876 
1877 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1878 		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1879 			psf->sf_oldin = mca_xcount ==
1880 				psf->sf_count[MCAST_EXCLUDE] &&
1881 				!psf->sf_count[MCAST_INCLUDE];
1882 		} else
1883 			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1884 }
1885 
1886 static int sf_setstate(struct ifmcaddr6 *pmc)
1887 {
1888 	struct ip6_sf_list *psf;
1889 	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1890 	int qrv = pmc->idev->mc_qrv;
1891 	int new_in, rv;
1892 
1893 	rv = 0;
1894 	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1895 		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1896 			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1897 				!psf->sf_count[MCAST_INCLUDE];
1898 		} else
1899 			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1900 		if (new_in != psf->sf_oldin) {
1901 			psf->sf_crcount = qrv;
1902 			rv++;
1903 		}
1904 	}
1905 	return rv;
1906 }
1907 
1908 /*
1909  * Add multicast source filter list to the interface list
1910  */
1911 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
1912 			  int sfmode, int sfcount, struct in6_addr *psfsrc,
1913 			  int delta)
1914 {
1915 	struct ifmcaddr6 *pmc;
1916 	int	isexclude;
1917 	int	i, err;
1918 
1919 	if (!idev)
1920 		return -ENODEV;
1921 	read_lock_bh(&idev->lock);
1922 	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1923 		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1924 			break;
1925 	}
1926 	if (!pmc) {
1927 		/* MCA not found?? bug */
1928 		read_unlock_bh(&idev->lock);
1929 		return -ESRCH;
1930 	}
1931 	spin_lock_bh(&pmc->mca_lock);
1932 
1933 	sf_markstate(pmc);
1934 	isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
1935 	if (!delta)
1936 		pmc->mca_sfcount[sfmode]++;
1937 	err = 0;
1938 	for (i=0; i<sfcount; i++) {
1939 		err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1940 		if (err)
1941 			break;
1942 	}
1943 	if (err) {
1944 		int j;
1945 
1946 		if (!delta)
1947 			pmc->mca_sfcount[sfmode]--;
1948 		for (j=0; j<i; j++)
1949 			(void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1950 	} else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1951 		struct inet6_dev *idev = pmc->idev;
1952 		struct ip6_sf_list *psf;
1953 
1954 		/* filter mode change */
1955 		if (pmc->mca_sfcount[MCAST_EXCLUDE])
1956 			pmc->mca_sfmode = MCAST_EXCLUDE;
1957 		else if (pmc->mca_sfcount[MCAST_INCLUDE])
1958 			pmc->mca_sfmode = MCAST_INCLUDE;
1959 		/* else no filters; keep old mode for reports */
1960 
1961 		pmc->mca_crcount = idev->mc_qrv;
1962 		idev->mc_ifc_count = pmc->mca_crcount;
1963 		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1964 			psf->sf_crcount = 0;
1965 		mld_ifc_event(idev);
1966 	} else if (sf_setstate(pmc))
1967 		mld_ifc_event(idev);
1968 	spin_unlock_bh(&pmc->mca_lock);
1969 	read_unlock_bh(&idev->lock);
1970 	return err;
1971 }
1972 
1973 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
1974 {
1975 	struct ip6_sf_list *psf, *nextpsf;
1976 
1977 	for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
1978 		nextpsf = psf->sf_next;
1979 		kfree(psf);
1980 	}
1981 	pmc->mca_tomb = NULL;
1982 	for (psf=pmc->mca_sources; psf; psf=nextpsf) {
1983 		nextpsf = psf->sf_next;
1984 		kfree(psf);
1985 	}
1986 	pmc->mca_sources = NULL;
1987 	pmc->mca_sfmode = MCAST_EXCLUDE;
1988 	pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1989 	pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
1990 }
1991 
1992 
1993 static void igmp6_join_group(struct ifmcaddr6 *ma)
1994 {
1995 	unsigned long delay;
1996 
1997 	if (ma->mca_flags & MAF_NOREPORT)
1998 		return;
1999 
2000 	igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2001 
2002 	delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2003 
2004 	spin_lock_bh(&ma->mca_lock);
2005 	if (del_timer(&ma->mca_timer)) {
2006 		atomic_dec(&ma->mca_refcnt);
2007 		delay = ma->mca_timer.expires - jiffies;
2008 	}
2009 
2010 	if (!mod_timer(&ma->mca_timer, jiffies + delay))
2011 		atomic_inc(&ma->mca_refcnt);
2012 	ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2013 	spin_unlock_bh(&ma->mca_lock);
2014 }
2015 
2016 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2017 			    struct inet6_dev *idev)
2018 {
2019 	int err;
2020 
2021 	if (iml->sflist == 0) {
2022 		/* any-source empty exclude case */
2023 		return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2024 	}
2025 	err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2026 		iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2027 	sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2028 	iml->sflist = NULL;
2029 	return err;
2030 }
2031 
2032 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2033 {
2034 	if (MLD_V1_SEEN(ma->idev)) {
2035 		if (ma->mca_flags & MAF_LAST_REPORTER)
2036 			igmp6_send(&ma->mca_addr, ma->idev->dev,
2037 				ICMPV6_MGM_REDUCTION);
2038 	} else {
2039 		mld_add_delrec(ma->idev, ma);
2040 		mld_ifc_event(ma->idev);
2041 	}
2042 }
2043 
2044 static void mld_gq_timer_expire(unsigned long data)
2045 {
2046 	struct inet6_dev *idev = (struct inet6_dev *)data;
2047 
2048 	idev->mc_gq_running = 0;
2049 	mld_send_report(idev, NULL);
2050 	__in6_dev_put(idev);
2051 }
2052 
2053 static void mld_ifc_timer_expire(unsigned long data)
2054 {
2055 	struct inet6_dev *idev = (struct inet6_dev *)data;
2056 
2057 	mld_send_cr(idev);
2058 	if (idev->mc_ifc_count) {
2059 		idev->mc_ifc_count--;
2060 		if (idev->mc_ifc_count)
2061 			mld_ifc_start_timer(idev, idev->mc_maxdelay);
2062 	}
2063 	__in6_dev_put(idev);
2064 }
2065 
2066 static void mld_ifc_event(struct inet6_dev *idev)
2067 {
2068 	if (MLD_V1_SEEN(idev))
2069 		return;
2070 	idev->mc_ifc_count = idev->mc_qrv;
2071 	mld_ifc_start_timer(idev, 1);
2072 }
2073 
2074 
2075 static void igmp6_timer_handler(unsigned long data)
2076 {
2077 	struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2078 
2079 	if (MLD_V1_SEEN(ma->idev))
2080 		igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2081 	else
2082 		mld_send_report(ma->idev, ma);
2083 
2084 	spin_lock(&ma->mca_lock);
2085 	ma->mca_flags |=  MAF_LAST_REPORTER;
2086 	ma->mca_flags &= ~MAF_TIMER_RUNNING;
2087 	spin_unlock(&ma->mca_lock);
2088 	ma_put(ma);
2089 }
2090 
2091 /* Device going down */
2092 
2093 void ipv6_mc_down(struct inet6_dev *idev)
2094 {
2095 	struct ifmcaddr6 *i;
2096 
2097 	/* Withdraw multicast list */
2098 
2099 	read_lock_bh(&idev->lock);
2100 	idev->mc_ifc_count = 0;
2101 	if (del_timer(&idev->mc_ifc_timer))
2102 		__in6_dev_put(idev);
2103 	idev->mc_gq_running = 0;
2104 	if (del_timer(&idev->mc_gq_timer))
2105 		__in6_dev_put(idev);
2106 
2107 	for (i = idev->mc_list; i; i=i->next)
2108 		igmp6_group_dropped(i);
2109 	read_unlock_bh(&idev->lock);
2110 
2111 	mld_clear_delrec(idev);
2112 }
2113 
2114 
2115 /* Device going up */
2116 
2117 void ipv6_mc_up(struct inet6_dev *idev)
2118 {
2119 	struct ifmcaddr6 *i;
2120 
2121 	/* Install multicast list, except for all-nodes (already installed) */
2122 
2123 	read_lock_bh(&idev->lock);
2124 	for (i = idev->mc_list; i; i=i->next)
2125 		igmp6_group_added(i);
2126 	read_unlock_bh(&idev->lock);
2127 }
2128 
2129 /* IPv6 device initialization. */
2130 
2131 void ipv6_mc_init_dev(struct inet6_dev *idev)
2132 {
2133 	struct in6_addr maddr;
2134 
2135 	write_lock_bh(&idev->lock);
2136 	rwlock_init(&idev->mc_lock);
2137 	idev->mc_gq_running = 0;
2138 	init_timer(&idev->mc_gq_timer);
2139 	idev->mc_gq_timer.data = (unsigned long) idev;
2140 	idev->mc_gq_timer.function = &mld_gq_timer_expire;
2141 	idev->mc_tomb = NULL;
2142 	idev->mc_ifc_count = 0;
2143 	init_timer(&idev->mc_ifc_timer);
2144 	idev->mc_ifc_timer.data = (unsigned long) idev;
2145 	idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2146 	idev->mc_qrv = MLD_QRV_DEFAULT;
2147 	idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2148 	idev->mc_v1_seen = 0;
2149 	write_unlock_bh(&idev->lock);
2150 
2151 	/* Add all-nodes address. */
2152 	ipv6_addr_all_nodes(&maddr);
2153 	ipv6_dev_mc_inc(idev->dev, &maddr);
2154 }
2155 
2156 /*
2157  *	Device is about to be destroyed: clean up.
2158  */
2159 
2160 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2161 {
2162 	struct ifmcaddr6 *i;
2163 	struct in6_addr maddr;
2164 
2165 	/* Deactivate timers */
2166 	ipv6_mc_down(idev);
2167 
2168 	/* Delete all-nodes address. */
2169 	ipv6_addr_all_nodes(&maddr);
2170 
2171 	/* We cannot call ipv6_dev_mc_dec() directly, our caller in
2172 	 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2173 	 * fail.
2174 	 */
2175 	__ipv6_dev_mc_dec(idev, &maddr);
2176 
2177 	if (idev->cnf.forwarding) {
2178 		ipv6_addr_all_routers(&maddr);
2179 		__ipv6_dev_mc_dec(idev, &maddr);
2180 	}
2181 
2182 	write_lock_bh(&idev->lock);
2183 	while ((i = idev->mc_list) != NULL) {
2184 		idev->mc_list = i->next;
2185 		write_unlock_bh(&idev->lock);
2186 
2187 		igmp6_group_dropped(i);
2188 		ma_put(i);
2189 
2190 		write_lock_bh(&idev->lock);
2191 	}
2192 	write_unlock_bh(&idev->lock);
2193 }
2194 
2195 #ifdef CONFIG_PROC_FS
2196 struct igmp6_mc_iter_state {
2197 	struct net_device *dev;
2198 	struct inet6_dev *idev;
2199 };
2200 
2201 #define igmp6_mc_seq_private(seq)	((struct igmp6_mc_iter_state *)(seq)->private)
2202 
2203 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2204 {
2205 	struct ifmcaddr6 *im = NULL;
2206 	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2207 
2208 	for (state->dev = dev_base, state->idev = NULL;
2209 	     state->dev;
2210 	     state->dev = state->dev->next) {
2211 		struct inet6_dev *idev;
2212 		idev = in6_dev_get(state->dev);
2213 		if (!idev)
2214 			continue;
2215 		read_lock_bh(&idev->lock);
2216 		im = idev->mc_list;
2217 		if (im) {
2218 			state->idev = idev;
2219 			break;
2220 		}
2221 		read_unlock_bh(&idev->lock);
2222 		in6_dev_put(idev);
2223 	}
2224 	return im;
2225 }
2226 
2227 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2228 {
2229 	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2230 
2231 	im = im->next;
2232 	while (!im) {
2233 		if (likely(state->idev != NULL)) {
2234 			read_unlock_bh(&state->idev->lock);
2235 			in6_dev_put(state->idev);
2236 		}
2237 		state->dev = state->dev->next;
2238 		if (!state->dev) {
2239 			state->idev = NULL;
2240 			break;
2241 		}
2242 		state->idev = in6_dev_get(state->dev);
2243 		if (!state->idev)
2244 			continue;
2245 		read_lock_bh(&state->idev->lock);
2246 		im = state->idev->mc_list;
2247 	}
2248 	return im;
2249 }
2250 
2251 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2252 {
2253 	struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2254 	if (im)
2255 		while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2256 			--pos;
2257 	return pos ? NULL : im;
2258 }
2259 
2260 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2261 {
2262 	read_lock(&dev_base_lock);
2263 	return igmp6_mc_get_idx(seq, *pos);
2264 }
2265 
2266 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2267 {
2268 	struct ifmcaddr6 *im;
2269 	im = igmp6_mc_get_next(seq, v);
2270 	++*pos;
2271 	return im;
2272 }
2273 
2274 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2275 {
2276 	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2277 	if (likely(state->idev != NULL)) {
2278 		read_unlock_bh(&state->idev->lock);
2279 		in6_dev_put(state->idev);
2280 		state->idev = NULL;
2281 	}
2282 	state->dev = NULL;
2283 	read_unlock(&dev_base_lock);
2284 }
2285 
2286 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2287 {
2288 	struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2289 	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2290 
2291 	seq_printf(seq,
2292 		   "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n",
2293 		   state->dev->ifindex, state->dev->name,
2294 		   NIP6(im->mca_addr),
2295 		   im->mca_users, im->mca_flags,
2296 		   (im->mca_flags&MAF_TIMER_RUNNING) ?
2297 		   jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2298 	return 0;
2299 }
2300 
2301 static struct seq_operations igmp6_mc_seq_ops = {
2302 	.start	=	igmp6_mc_seq_start,
2303 	.next	=	igmp6_mc_seq_next,
2304 	.stop	=	igmp6_mc_seq_stop,
2305 	.show	=	igmp6_mc_seq_show,
2306 };
2307 
2308 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2309 {
2310 	struct seq_file *seq;
2311 	int rc = -ENOMEM;
2312 	struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2313 
2314 	if (!s)
2315 		goto out;
2316 
2317 	rc = seq_open(file, &igmp6_mc_seq_ops);
2318 	if (rc)
2319 		goto out_kfree;
2320 
2321 	seq = file->private_data;
2322 	seq->private = s;
2323 	memset(s, 0, sizeof(*s));
2324 out:
2325 	return rc;
2326 out_kfree:
2327 	kfree(s);
2328 	goto out;
2329 }
2330 
2331 static struct file_operations igmp6_mc_seq_fops = {
2332 	.owner		=	THIS_MODULE,
2333 	.open		=	igmp6_mc_seq_open,
2334 	.read		=	seq_read,
2335 	.llseek		=	seq_lseek,
2336 	.release	=	seq_release_private,
2337 };
2338 
2339 struct igmp6_mcf_iter_state {
2340 	struct net_device *dev;
2341 	struct inet6_dev *idev;
2342 	struct ifmcaddr6 *im;
2343 };
2344 
2345 #define igmp6_mcf_seq_private(seq)	((struct igmp6_mcf_iter_state *)(seq)->private)
2346 
2347 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2348 {
2349 	struct ip6_sf_list *psf = NULL;
2350 	struct ifmcaddr6 *im = NULL;
2351 	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2352 
2353 	for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2354 	     state->dev;
2355 	     state->dev = state->dev->next) {
2356 		struct inet6_dev *idev;
2357 		idev = in6_dev_get(state->dev);
2358 		if (unlikely(idev == NULL))
2359 			continue;
2360 		read_lock_bh(&idev->lock);
2361 		im = idev->mc_list;
2362 		if (likely(im != NULL)) {
2363 			spin_lock_bh(&im->mca_lock);
2364 			psf = im->mca_sources;
2365 			if (likely(psf != NULL)) {
2366 				state->im = im;
2367 				state->idev = idev;
2368 				break;
2369 			}
2370 			spin_unlock_bh(&im->mca_lock);
2371 		}
2372 		read_unlock_bh(&idev->lock);
2373 		in6_dev_put(idev);
2374 	}
2375 	return psf;
2376 }
2377 
2378 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2379 {
2380 	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2381 
2382 	psf = psf->sf_next;
2383 	while (!psf) {
2384 		spin_unlock_bh(&state->im->mca_lock);
2385 		state->im = state->im->next;
2386 		while (!state->im) {
2387 			if (likely(state->idev != NULL)) {
2388 				read_unlock_bh(&state->idev->lock);
2389 				in6_dev_put(state->idev);
2390 			}
2391 			state->dev = state->dev->next;
2392 			if (!state->dev) {
2393 				state->idev = NULL;
2394 				goto out;
2395 			}
2396 			state->idev = in6_dev_get(state->dev);
2397 			if (!state->idev)
2398 				continue;
2399 			read_lock_bh(&state->idev->lock);
2400 			state->im = state->idev->mc_list;
2401 		}
2402 		if (!state->im)
2403 			break;
2404 		spin_lock_bh(&state->im->mca_lock);
2405 		psf = state->im->mca_sources;
2406 	}
2407 out:
2408 	return psf;
2409 }
2410 
2411 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2412 {
2413 	struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2414 	if (psf)
2415 		while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2416 			--pos;
2417 	return pos ? NULL : psf;
2418 }
2419 
2420 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2421 {
2422 	read_lock(&dev_base_lock);
2423 	return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2424 }
2425 
2426 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2427 {
2428 	struct ip6_sf_list *psf;
2429 	if (v == SEQ_START_TOKEN)
2430 		psf = igmp6_mcf_get_first(seq);
2431 	else
2432 		psf = igmp6_mcf_get_next(seq, v);
2433 	++*pos;
2434 	return psf;
2435 }
2436 
2437 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2438 {
2439 	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2440 	if (likely(state->im != NULL)) {
2441 		spin_unlock_bh(&state->im->mca_lock);
2442 		state->im = NULL;
2443 	}
2444 	if (likely(state->idev != NULL)) {
2445 		read_unlock_bh(&state->idev->lock);
2446 		in6_dev_put(state->idev);
2447 		state->idev = NULL;
2448 	}
2449 	state->dev = NULL;
2450 	read_unlock(&dev_base_lock);
2451 }
2452 
2453 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2454 {
2455 	struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2456 	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2457 
2458 	if (v == SEQ_START_TOKEN) {
2459 		seq_printf(seq,
2460 			   "%3s %6s "
2461 			   "%32s %32s %6s %6s\n", "Idx",
2462 			   "Device", "Multicast Address",
2463 			   "Source Address", "INC", "EXC");
2464 	} else {
2465 		seq_printf(seq,
2466 			   "%3d %6.6s "
2467 			   "%04x%04x%04x%04x%04x%04x%04x%04x "
2468 			   "%04x%04x%04x%04x%04x%04x%04x%04x "
2469 			   "%6lu %6lu\n",
2470 			   state->dev->ifindex, state->dev->name,
2471 			   NIP6(state->im->mca_addr),
2472 			   NIP6(psf->sf_addr),
2473 			   psf->sf_count[MCAST_INCLUDE],
2474 			   psf->sf_count[MCAST_EXCLUDE]);
2475 	}
2476 	return 0;
2477 }
2478 
2479 static struct seq_operations igmp6_mcf_seq_ops = {
2480 	.start	=	igmp6_mcf_seq_start,
2481 	.next	=	igmp6_mcf_seq_next,
2482 	.stop	=	igmp6_mcf_seq_stop,
2483 	.show	=	igmp6_mcf_seq_show,
2484 };
2485 
2486 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2487 {
2488 	struct seq_file *seq;
2489 	int rc = -ENOMEM;
2490 	struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2491 
2492 	if (!s)
2493 		goto out;
2494 
2495 	rc = seq_open(file, &igmp6_mcf_seq_ops);
2496 	if (rc)
2497 		goto out_kfree;
2498 
2499 	seq = file->private_data;
2500 	seq->private = s;
2501 	memset(s, 0, sizeof(*s));
2502 out:
2503 	return rc;
2504 out_kfree:
2505 	kfree(s);
2506 	goto out;
2507 }
2508 
2509 static struct file_operations igmp6_mcf_seq_fops = {
2510 	.owner		=	THIS_MODULE,
2511 	.open		=	igmp6_mcf_seq_open,
2512 	.read		=	seq_read,
2513 	.llseek		=	seq_lseek,
2514 	.release	=	seq_release_private,
2515 };
2516 #endif
2517 
2518 int __init igmp6_init(struct net_proto_family *ops)
2519 {
2520 	struct ipv6_pinfo *np;
2521 	struct sock *sk;
2522 	int err;
2523 
2524 	err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2525 	if (err < 0) {
2526 		printk(KERN_ERR
2527 		       "Failed to initialize the IGMP6 control socket (err %d).\n",
2528 		       err);
2529 		igmp6_socket = NULL; /* For safety. */
2530 		return err;
2531 	}
2532 
2533 	sk = igmp6_socket->sk;
2534 	sk->sk_allocation = GFP_ATOMIC;
2535 	sk->sk_prot->unhash(sk);
2536 
2537 	np = inet6_sk(sk);
2538 	np->hop_limit = 1;
2539 
2540 #ifdef CONFIG_PROC_FS
2541 	proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2542 	proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2543 #endif
2544 
2545 	return 0;
2546 }
2547 
2548 void igmp6_cleanup(void)
2549 {
2550 	sock_release(igmp6_socket);
2551 	igmp6_socket = NULL; /* for safety */
2552 
2553 #ifdef CONFIG_PROC_FS
2554 	proc_net_remove("mcfilter6");
2555 	proc_net_remove("igmp6");
2556 #endif
2557 }
2558