[NET]: Rework dev_base via list_head (v3)
[linux-2.6.git] / net / ipv6 / mcast.c
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/module.h>
32 #include <linux/errno.h>
33 #include <linux/types.h>
34 #include <linux/string.h>
35 #include <linux/socket.h>
36 #include <linux/sockios.h>
37 #include <linux/jiffies.h>
38 #include <linux/times.h>
39 #include <linux/net.h>
40 #include <linux/in.h>
41 #include <linux/in6.h>
42 #include <linux/netdevice.h>
43 #include <linux/if_arp.h>
44 #include <linux/route.h>
45 #include <linux/init.h>
46 #include <linux/proc_fs.h>
47 #include <linux/seq_file.h>
48
49 #include <linux/netfilter.h>
50 #include <linux/netfilter_ipv6.h>
51
52 #include <net/sock.h>
53 #include <net/snmp.h>
54
55 #include <net/ipv6.h>
56 #include <net/protocol.h>
57 #include <net/if_inet6.h>
58 #include <net/ndisc.h>
59 #include <net/addrconf.h>
60 #include <net/ip6_route.h>
61
62 #include <net/ip6_checksum.h>
63
64 /* Set to 3 to get tracing... */
65 #define MCAST_DEBUG 2
66
67 #if MCAST_DEBUG >= 3
68 #define MDBG(x) printk x
69 #else
70 #define MDBG(x)
71 #endif
72
73 /*
74  *  These header formats should be in a separate include file, but icmpv6.h
75  *  doesn't have in6_addr defined in all cases, there is no __u128, and no
76  *  other files reference these.
77  *
78  *                      +-DLS 4/14/03
79  */
80
81 /* Multicast Listener Discovery version 2 headers */
82
83 struct mld2_grec {
84         __u8            grec_type;
85         __u8            grec_auxwords;
86         __be16          grec_nsrcs;
87         struct in6_addr grec_mca;
88         struct in6_addr grec_src[0];
89 };
90
91 struct mld2_report {
92         __u8    type;
93         __u8    resv1;
94         __sum16 csum;
95         __be16  resv2;
96         __be16  ngrec;
97         struct mld2_grec grec[0];
98 };
99
100 struct mld2_query {
101         __u8 type;
102         __u8 code;
103         __sum16 csum;
104         __be16 mrc;
105         __be16 resv1;
106         struct in6_addr mca;
107 #if defined(__LITTLE_ENDIAN_BITFIELD)
108         __u8 qrv:3,
109              suppress:1,
110              resv2:4;
111 #elif defined(__BIG_ENDIAN_BITFIELD)
112         __u8 resv2:4,
113              suppress:1,
114              qrv:3;
115 #else
116 #error "Please fix <asm/byteorder.h>"
117 #endif
118         __u8 qqic;
119         __be16 nsrcs;
120         struct in6_addr srcs[0];
121 };
122
123 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
124
125 /* Big mc list lock for all the sockets */
126 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
127
128 static struct socket *igmp6_socket;
129
130 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
131
132 static void igmp6_join_group(struct ifmcaddr6 *ma);
133 static void igmp6_leave_group(struct ifmcaddr6 *ma);
134 static void igmp6_timer_handler(unsigned long data);
135
136 static void mld_gq_timer_expire(unsigned long data);
137 static void mld_ifc_timer_expire(unsigned long data);
138 static void mld_ifc_event(struct inet6_dev *idev);
139 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
140 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
141 static void mld_clear_delrec(struct inet6_dev *idev);
142 static int sf_setstate(struct ifmcaddr6 *pmc);
143 static void sf_markstate(struct ifmcaddr6 *pmc);
144 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
145 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
146                           int sfmode, int sfcount, struct in6_addr *psfsrc,
147                           int delta);
148 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
149                           int sfmode, int sfcount, struct in6_addr *psfsrc,
150                           int delta);
151 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
152                             struct inet6_dev *idev);
153
154
155 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
156 #define MLD_QRV_DEFAULT         2
157
158 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
159                 (idev)->cnf.force_mld_version == 1 || \
160                 ((idev)->mc_v1_seen && \
161                 time_before(jiffies, (idev)->mc_v1_seen)))
162
163 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
164 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
165         ((value) < (thresh) ? (value) : \
166         ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
167         (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
168
169 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
170 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
171
172 #define IPV6_MLD_MAX_MSF        64
173
174 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
175
176 /*
177  *      socket join on multicast group
178  */
179
180 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
181 {
182         struct net_device *dev = NULL;
183         struct ipv6_mc_socklist *mc_lst;
184         struct ipv6_pinfo *np = inet6_sk(sk);
185         int err;
186
187         if (!ipv6_addr_is_multicast(addr))
188                 return -EINVAL;
189
190         read_lock_bh(&ipv6_sk_mc_lock);
191         for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
192                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
193                     ipv6_addr_equal(&mc_lst->addr, addr)) {
194                         read_unlock_bh(&ipv6_sk_mc_lock);
195                         return -EADDRINUSE;
196                 }
197         }
198         read_unlock_bh(&ipv6_sk_mc_lock);
199
200         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
201
202         if (mc_lst == NULL)
203                 return -ENOMEM;
204
205         mc_lst->next = NULL;
206         ipv6_addr_copy(&mc_lst->addr, addr);
207
208         if (ifindex == 0) {
209                 struct rt6_info *rt;
210                 rt = rt6_lookup(addr, NULL, 0, 0);
211                 if (rt) {
212                         dev = rt->rt6i_dev;
213                         dev_hold(dev);
214                         dst_release(&rt->u.dst);
215                 }
216         } else
217                 dev = dev_get_by_index(ifindex);
218
219         if (dev == NULL) {
220                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
221                 return -ENODEV;
222         }
223
224         mc_lst->ifindex = dev->ifindex;
225         mc_lst->sfmode = MCAST_EXCLUDE;
226         rwlock_init(&mc_lst->sflock);
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                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
272                                 if (idev) {
273                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
274                                         in6_dev_put(idev);
275                                 }
276                                 dev_put(dev);
277                         } else
278                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
279                         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
280                         return 0;
281                 }
282         }
283         write_unlock_bh(&ipv6_sk_mc_lock);
284
285         return -EADDRNOTAVAIL;
286 }
287
288 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
289 {
290         struct net_device *dev = NULL;
291         struct inet6_dev *idev = NULL;
292
293         if (ifindex == 0) {
294                 struct rt6_info *rt;
295
296                 rt = rt6_lookup(group, NULL, 0, 0);
297                 if (rt) {
298                         dev = rt->rt6i_dev;
299                         dev_hold(dev);
300                         dst_release(&rt->u.dst);
301                 }
302         } else
303                 dev = dev_get_by_index(ifindex);
304
305         if (!dev)
306                 return NULL;
307         idev = in6_dev_get(dev);
308         if (!idev) {
309                 dev_put(dev);
310                 return NULL;
311         }
312         read_lock_bh(&idev->lock);
313         if (idev->dead) {
314                 read_unlock_bh(&idev->lock);
315                 in6_dev_put(idev);
316                 dev_put(dev);
317                 return NULL;
318         }
319         return idev;
320 }
321
322 void ipv6_sock_mc_close(struct sock *sk)
323 {
324         struct ipv6_pinfo *np = inet6_sk(sk);
325         struct ipv6_mc_socklist *mc_lst;
326
327         write_lock_bh(&ipv6_sk_mc_lock);
328         while ((mc_lst = np->ipv6_mc_list) != NULL) {
329                 struct net_device *dev;
330
331                 np->ipv6_mc_list = mc_lst->next;
332                 write_unlock_bh(&ipv6_sk_mc_lock);
333
334                 dev = dev_get_by_index(mc_lst->ifindex);
335                 if (dev) {
336                         struct inet6_dev *idev = in6_dev_get(dev);
337
338                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
339                         if (idev) {
340                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
341                                 in6_dev_put(idev);
342                         }
343                         dev_put(dev);
344                 } else
345                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
346
347                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
348
349                 write_lock_bh(&ipv6_sk_mc_lock);
350         }
351         write_unlock_bh(&ipv6_sk_mc_lock);
352 }
353
354 int ip6_mc_source(int add, int omode, struct sock *sk,
355         struct group_source_req *pgsr)
356 {
357         struct in6_addr *source, *group;
358         struct ipv6_mc_socklist *pmc;
359         struct net_device *dev;
360         struct inet6_dev *idev;
361         struct ipv6_pinfo *inet6 = inet6_sk(sk);
362         struct ip6_sf_socklist *psl;
363         int i, j, rv;
364         int leavegroup = 0;
365         int pmclocked = 0;
366         int err;
367
368         if (pgsr->gsr_group.ss_family != AF_INET6 ||
369             pgsr->gsr_source.ss_family != AF_INET6)
370                 return -EINVAL;
371
372         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
373         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
374
375         if (!ipv6_addr_is_multicast(group))
376                 return -EINVAL;
377
378         idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
379         if (!idev)
380                 return -ENODEV;
381         dev = idev->dev;
382
383         err = -EADDRNOTAVAIL;
384
385         read_lock_bh(&ipv6_sk_mc_lock);
386         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
387                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
388                         continue;
389                 if (ipv6_addr_equal(&pmc->addr, group))
390                         break;
391         }
392         if (!pmc) {             /* must have a prior join */
393                 err = -EINVAL;
394                 goto done;
395         }
396         /* if a source filter was set, must be the same mode as before */
397         if (pmc->sflist) {
398                 if (pmc->sfmode != omode) {
399                         err = -EINVAL;
400                         goto done;
401                 }
402         } else if (pmc->sfmode != omode) {
403                 /* allow mode switches for empty-set filters */
404                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
405                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
406                 pmc->sfmode = omode;
407         }
408
409         write_lock_bh(&pmc->sflock);
410         pmclocked = 1;
411
412         psl = pmc->sflist;
413         if (!add) {
414                 if (!psl)
415                         goto done;      /* err = -EADDRNOTAVAIL */
416                 rv = !0;
417                 for (i=0; i<psl->sl_count; i++) {
418                         rv = memcmp(&psl->sl_addr[i], source,
419                                 sizeof(struct in6_addr));
420                         if (rv == 0)
421                                 break;
422                 }
423                 if (rv)         /* source not found */
424                         goto done;      /* err = -EADDRNOTAVAIL */
425
426                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
427                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
428                         leavegroup = 1;
429                         goto done;
430                 }
431
432                 /* update the interface filter */
433                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
434
435                 for (j=i+1; j<psl->sl_count; j++)
436                         psl->sl_addr[j-1] = psl->sl_addr[j];
437                 psl->sl_count--;
438                 err = 0;
439                 goto done;
440         }
441         /* else, add a new source to the filter */
442
443         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
444                 err = -ENOBUFS;
445                 goto done;
446         }
447         if (!psl || psl->sl_count == psl->sl_max) {
448                 struct ip6_sf_socklist *newpsl;
449                 int count = IP6_SFBLOCK;
450
451                 if (psl)
452                         count += psl->sl_max;
453                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
454                 if (!newpsl) {
455                         err = -ENOBUFS;
456                         goto done;
457                 }
458                 newpsl->sl_max = count;
459                 newpsl->sl_count = count - IP6_SFBLOCK;
460                 if (psl) {
461                         for (i=0; i<psl->sl_count; i++)
462                                 newpsl->sl_addr[i] = psl->sl_addr[i];
463                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
464                 }
465                 pmc->sflist = psl = newpsl;
466         }
467         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
468         for (i=0; i<psl->sl_count; i++) {
469                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
470                 if (rv == 0)
471                         break;
472         }
473         if (rv == 0)            /* address already there is an error */
474                 goto done;
475         for (j=psl->sl_count-1; j>=i; j--)
476                 psl->sl_addr[j+1] = psl->sl_addr[j];
477         psl->sl_addr[i] = *source;
478         psl->sl_count++;
479         err = 0;
480         /* update the interface list */
481         ip6_mc_add_src(idev, group, omode, 1, source, 1);
482 done:
483         if (pmclocked)
484                 write_unlock_bh(&pmc->sflock);
485         read_unlock_bh(&ipv6_sk_mc_lock);
486         read_unlock_bh(&idev->lock);
487         in6_dev_put(idev);
488         dev_put(dev);
489         if (leavegroup)
490                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
491         return err;
492 }
493
494 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
495 {
496         struct in6_addr *group;
497         struct ipv6_mc_socklist *pmc;
498         struct net_device *dev;
499         struct inet6_dev *idev;
500         struct ipv6_pinfo *inet6 = inet6_sk(sk);
501         struct ip6_sf_socklist *newpsl, *psl;
502         int leavegroup = 0;
503         int i, err;
504
505         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
506
507         if (!ipv6_addr_is_multicast(group))
508                 return -EINVAL;
509         if (gsf->gf_fmode != MCAST_INCLUDE &&
510             gsf->gf_fmode != MCAST_EXCLUDE)
511                 return -EINVAL;
512
513         idev = ip6_mc_find_dev(group, gsf->gf_interface);
514
515         if (!idev)
516                 return -ENODEV;
517         dev = idev->dev;
518
519         err = 0;
520         read_lock_bh(&ipv6_sk_mc_lock);
521
522         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
523                 leavegroup = 1;
524                 goto done;
525         }
526
527         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
528                 if (pmc->ifindex != gsf->gf_interface)
529                         continue;
530                 if (ipv6_addr_equal(&pmc->addr, group))
531                         break;
532         }
533         if (!pmc) {             /* must have a prior join */
534                 err = -EINVAL;
535                 goto done;
536         }
537         if (gsf->gf_numsrc) {
538                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
539                                                           GFP_ATOMIC);
540                 if (!newpsl) {
541                         err = -ENOBUFS;
542                         goto done;
543                 }
544                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
545                 for (i=0; i<newpsl->sl_count; ++i) {
546                         struct sockaddr_in6 *psin6;
547
548                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
549                         newpsl->sl_addr[i] = psin6->sin6_addr;
550                 }
551                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
552                         newpsl->sl_count, newpsl->sl_addr, 0);
553                 if (err) {
554                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
555                         goto done;
556                 }
557         } else {
558                 newpsl = NULL;
559                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
560         }
561
562         write_lock_bh(&pmc->sflock);
563         psl = pmc->sflist;
564         if (psl) {
565                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
566                         psl->sl_count, psl->sl_addr, 0);
567                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
568         } else
569                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
570         pmc->sflist = newpsl;
571         pmc->sfmode = gsf->gf_fmode;
572         write_unlock_bh(&pmc->sflock);
573         err = 0;
574 done:
575         read_unlock_bh(&ipv6_sk_mc_lock);
576         read_unlock_bh(&idev->lock);
577         in6_dev_put(idev);
578         dev_put(dev);
579         if (leavegroup)
580                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
581         return err;
582 }
583
584 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
585         struct group_filter __user *optval, int __user *optlen)
586 {
587         int err, i, count, copycount;
588         struct in6_addr *group;
589         struct ipv6_mc_socklist *pmc;
590         struct inet6_dev *idev;
591         struct net_device *dev;
592         struct ipv6_pinfo *inet6 = inet6_sk(sk);
593         struct ip6_sf_socklist *psl;
594
595         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
596
597         if (!ipv6_addr_is_multicast(group))
598                 return -EINVAL;
599
600         idev = ip6_mc_find_dev(group, gsf->gf_interface);
601
602         if (!idev)
603                 return -ENODEV;
604
605         dev = idev->dev;
606
607         err = -EADDRNOTAVAIL;
608         /*
609          * changes to the ipv6_mc_list require the socket lock and
610          * a read lock on ip6_sk_mc_lock. We have the socket lock,
611          * so reading the list is safe.
612          */
613
614         for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
615                 if (pmc->ifindex != gsf->gf_interface)
616                         continue;
617                 if (ipv6_addr_equal(group, &pmc->addr))
618                         break;
619         }
620         if (!pmc)               /* must have a prior join */
621                 goto done;
622         gsf->gf_fmode = pmc->sfmode;
623         psl = pmc->sflist;
624         count = psl ? psl->sl_count : 0;
625         read_unlock_bh(&idev->lock);
626         in6_dev_put(idev);
627         dev_put(dev);
628
629         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
630         gsf->gf_numsrc = count;
631         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
632             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
633                 return -EFAULT;
634         }
635         /* changes to psl require the socket lock, a read lock on
636          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
637          * have the socket lock, so reading here is safe.
638          */
639         for (i=0; i<copycount; i++) {
640                 struct sockaddr_in6 *psin6;
641                 struct sockaddr_storage ss;
642
643                 psin6 = (struct sockaddr_in6 *)&ss;
644                 memset(&ss, 0, sizeof(ss));
645                 psin6->sin6_family = AF_INET6;
646                 psin6->sin6_addr = psl->sl_addr[i];
647                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
648                         return -EFAULT;
649         }
650         return 0;
651 done:
652         read_unlock_bh(&idev->lock);
653         in6_dev_put(idev);
654         dev_put(dev);
655         return err;
656 }
657
658 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
659         struct in6_addr *src_addr)
660 {
661         struct ipv6_pinfo *np = inet6_sk(sk);
662         struct ipv6_mc_socklist *mc;
663         struct ip6_sf_socklist *psl;
664         int rv = 1;
665
666         read_lock(&ipv6_sk_mc_lock);
667         for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
668                 if (ipv6_addr_equal(&mc->addr, mc_addr))
669                         break;
670         }
671         if (!mc) {
672                 read_unlock(&ipv6_sk_mc_lock);
673                 return 1;
674         }
675         read_lock(&mc->sflock);
676         psl = mc->sflist;
677         if (!psl) {
678                 rv = mc->sfmode == MCAST_EXCLUDE;
679         } else {
680                 int i;
681
682                 for (i=0; i<psl->sl_count; i++) {
683                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
684                                 break;
685                 }
686                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
687                         rv = 0;
688                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
689                         rv = 0;
690         }
691         read_unlock(&mc->sflock);
692         read_unlock(&ipv6_sk_mc_lock);
693
694         return rv;
695 }
696
697 static void ma_put(struct ifmcaddr6 *mc)
698 {
699         if (atomic_dec_and_test(&mc->mca_refcnt)) {
700                 in6_dev_put(mc->idev);
701                 kfree(mc);
702         }
703 }
704
705 static void igmp6_group_added(struct ifmcaddr6 *mc)
706 {
707         struct net_device *dev = mc->idev->dev;
708         char buf[MAX_ADDR_LEN];
709
710         spin_lock_bh(&mc->mca_lock);
711         if (!(mc->mca_flags&MAF_LOADED)) {
712                 mc->mca_flags |= MAF_LOADED;
713                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
714                         dev_mc_add(dev, buf, dev->addr_len, 0);
715         }
716         spin_unlock_bh(&mc->mca_lock);
717
718         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
719                 return;
720
721         if (MLD_V1_SEEN(mc->idev)) {
722                 igmp6_join_group(mc);
723                 return;
724         }
725         /* else v2 */
726
727         mc->mca_crcount = mc->idev->mc_qrv;
728         mld_ifc_event(mc->idev);
729 }
730
731 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
732 {
733         struct net_device *dev = mc->idev->dev;
734         char buf[MAX_ADDR_LEN];
735
736         spin_lock_bh(&mc->mca_lock);
737         if (mc->mca_flags&MAF_LOADED) {
738                 mc->mca_flags &= ~MAF_LOADED;
739                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
740                         dev_mc_delete(dev, buf, dev->addr_len, 0);
741         }
742
743         if (mc->mca_flags & MAF_NOREPORT)
744                 goto done;
745         spin_unlock_bh(&mc->mca_lock);
746
747         if (!mc->idev->dead)
748                 igmp6_leave_group(mc);
749
750         spin_lock_bh(&mc->mca_lock);
751         if (del_timer(&mc->mca_timer))
752                 atomic_dec(&mc->mca_refcnt);
753 done:
754         ip6_mc_clear_src(mc);
755         spin_unlock_bh(&mc->mca_lock);
756 }
757
758 /*
759  * deleted ifmcaddr6 manipulation
760  */
761 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
762 {
763         struct ifmcaddr6 *pmc;
764
765         /* this is an "ifmcaddr6" for convenience; only the fields below
766          * are actually used. In particular, the refcnt and users are not
767          * used for management of the delete list. Using the same structure
768          * for deleted items allows change reports to use common code with
769          * non-deleted or query-response MCA's.
770          */
771         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
772         if (!pmc)
773                 return;
774
775         spin_lock_bh(&im->mca_lock);
776         spin_lock_init(&pmc->mca_lock);
777         pmc->idev = im->idev;
778         in6_dev_hold(idev);
779         pmc->mca_addr = im->mca_addr;
780         pmc->mca_crcount = idev->mc_qrv;
781         pmc->mca_sfmode = im->mca_sfmode;
782         if (pmc->mca_sfmode == MCAST_INCLUDE) {
783                 struct ip6_sf_list *psf;
784
785                 pmc->mca_tomb = im->mca_tomb;
786                 pmc->mca_sources = im->mca_sources;
787                 im->mca_tomb = im->mca_sources = NULL;
788                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
789                         psf->sf_crcount = pmc->mca_crcount;
790         }
791         spin_unlock_bh(&im->mca_lock);
792
793         write_lock_bh(&idev->mc_lock);
794         pmc->next = idev->mc_tomb;
795         idev->mc_tomb = pmc;
796         write_unlock_bh(&idev->mc_lock);
797 }
798
799 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
800 {
801         struct ifmcaddr6 *pmc, *pmc_prev;
802         struct ip6_sf_list *psf, *psf_next;
803
804         write_lock_bh(&idev->mc_lock);
805         pmc_prev = NULL;
806         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
807                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
808                         break;
809                 pmc_prev = pmc;
810         }
811         if (pmc) {
812                 if (pmc_prev)
813                         pmc_prev->next = pmc->next;
814                 else
815                         idev->mc_tomb = pmc->next;
816         }
817         write_unlock_bh(&idev->mc_lock);
818         if (pmc) {
819                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
820                         psf_next = psf->sf_next;
821                         kfree(psf);
822                 }
823                 in6_dev_put(pmc->idev);
824                 kfree(pmc);
825         }
826 }
827
828 static void mld_clear_delrec(struct inet6_dev *idev)
829 {
830         struct ifmcaddr6 *pmc, *nextpmc;
831
832         write_lock_bh(&idev->mc_lock);
833         pmc = idev->mc_tomb;
834         idev->mc_tomb = NULL;
835         write_unlock_bh(&idev->mc_lock);
836
837         for (; pmc; pmc = nextpmc) {
838                 nextpmc = pmc->next;
839                 ip6_mc_clear_src(pmc);
840                 in6_dev_put(pmc->idev);
841                 kfree(pmc);
842         }
843
844         /* clear dead sources, too */
845         read_lock_bh(&idev->lock);
846         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
847                 struct ip6_sf_list *psf, *psf_next;
848
849                 spin_lock_bh(&pmc->mca_lock);
850                 psf = pmc->mca_tomb;
851                 pmc->mca_tomb = NULL;
852                 spin_unlock_bh(&pmc->mca_lock);
853                 for (; psf; psf=psf_next) {
854                         psf_next = psf->sf_next;
855                         kfree(psf);
856                 }
857         }
858         read_unlock_bh(&idev->lock);
859 }
860
861
862 /*
863  *      device multicast group inc (add if not found)
864  */
865 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
866 {
867         struct ifmcaddr6 *mc;
868         struct inet6_dev *idev;
869
870         idev = in6_dev_get(dev);
871
872         if (idev == NULL)
873                 return -EINVAL;
874
875         write_lock_bh(&idev->lock);
876         if (idev->dead) {
877                 write_unlock_bh(&idev->lock);
878                 in6_dev_put(idev);
879                 return -ENODEV;
880         }
881
882         for (mc = idev->mc_list; mc; mc = mc->next) {
883                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
884                         mc->mca_users++;
885                         write_unlock_bh(&idev->lock);
886                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
887                                 NULL, 0);
888                         in6_dev_put(idev);
889                         return 0;
890                 }
891         }
892
893         /*
894          *      not found: create a new one.
895          */
896
897         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
898
899         if (mc == NULL) {
900                 write_unlock_bh(&idev->lock);
901                 in6_dev_put(idev);
902                 return -ENOMEM;
903         }
904
905         init_timer(&mc->mca_timer);
906         mc->mca_timer.function = igmp6_timer_handler;
907         mc->mca_timer.data = (unsigned long) mc;
908
909         ipv6_addr_copy(&mc->mca_addr, addr);
910         mc->idev = idev;
911         mc->mca_users = 1;
912         /* mca_stamp should be updated upon changes */
913         mc->mca_cstamp = mc->mca_tstamp = jiffies;
914         atomic_set(&mc->mca_refcnt, 2);
915         spin_lock_init(&mc->mca_lock);
916
917         /* initial mode is (EX, empty) */
918         mc->mca_sfmode = MCAST_EXCLUDE;
919         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
920
921         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
922             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
923                 mc->mca_flags |= MAF_NOREPORT;
924
925         mc->next = idev->mc_list;
926         idev->mc_list = mc;
927         write_unlock_bh(&idev->lock);
928
929         mld_del_delrec(idev, &mc->mca_addr);
930         igmp6_group_added(mc);
931         ma_put(mc);
932         return 0;
933 }
934
935 /*
936  *      device multicast group del
937  */
938 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
939 {
940         struct ifmcaddr6 *ma, **map;
941
942         write_lock_bh(&idev->lock);
943         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
944                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
945                         if (--ma->mca_users == 0) {
946                                 *map = ma->next;
947                                 write_unlock_bh(&idev->lock);
948
949                                 igmp6_group_dropped(ma);
950
951                                 ma_put(ma);
952                                 return 0;
953                         }
954                         write_unlock_bh(&idev->lock);
955                         return 0;
956                 }
957         }
958         write_unlock_bh(&idev->lock);
959
960         return -ENOENT;
961 }
962
963 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
964 {
965         struct inet6_dev *idev = in6_dev_get(dev);
966         int err;
967
968         if (!idev)
969                 return -ENODEV;
970
971         err = __ipv6_dev_mc_dec(idev, addr);
972
973         in6_dev_put(idev);
974
975         return err;
976 }
977
978 /*
979  * identify MLD packets for MLD filter exceptions
980  */
981 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
982 {
983         struct icmp6hdr *pic;
984
985         if (nexthdr != IPPROTO_ICMPV6)
986                 return 0;
987
988         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
989                 return 0;
990
991         pic = icmp6_hdr(skb);
992
993         switch (pic->icmp6_type) {
994         case ICMPV6_MGM_QUERY:
995         case ICMPV6_MGM_REPORT:
996         case ICMPV6_MGM_REDUCTION:
997         case ICMPV6_MLD2_REPORT:
998                 return 1;
999         default:
1000                 break;
1001         }
1002         return 0;
1003 }
1004
1005 /*
1006  *      check if the interface/address pair is valid
1007  */
1008 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1009         struct in6_addr *src_addr)
1010 {
1011         struct inet6_dev *idev;
1012         struct ifmcaddr6 *mc;
1013         int rv = 0;
1014
1015         idev = in6_dev_get(dev);
1016         if (idev) {
1017                 read_lock_bh(&idev->lock);
1018                 for (mc = idev->mc_list; mc; mc=mc->next) {
1019                         if (ipv6_addr_equal(&mc->mca_addr, group))
1020                                 break;
1021                 }
1022                 if (mc) {
1023                         if (src_addr && !ipv6_addr_any(src_addr)) {
1024                                 struct ip6_sf_list *psf;
1025
1026                                 spin_lock_bh(&mc->mca_lock);
1027                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1028                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1029                                                 break;
1030                                 }
1031                                 if (psf)
1032                                         rv = psf->sf_count[MCAST_INCLUDE] ||
1033                                                 psf->sf_count[MCAST_EXCLUDE] !=
1034                                                 mc->mca_sfcount[MCAST_EXCLUDE];
1035                                 else
1036                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1037                                 spin_unlock_bh(&mc->mca_lock);
1038                         } else
1039                                 rv = 1; /* don't filter unspecified source */
1040                 }
1041                 read_unlock_bh(&idev->lock);
1042                 in6_dev_put(idev);
1043         }
1044         return rv;
1045 }
1046
1047 static void mld_gq_start_timer(struct inet6_dev *idev)
1048 {
1049         int tv = net_random() % idev->mc_maxdelay;
1050
1051         idev->mc_gq_running = 1;
1052         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1053                 in6_dev_hold(idev);
1054 }
1055
1056 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1057 {
1058         int tv = net_random() % delay;
1059
1060         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1061                 in6_dev_hold(idev);
1062 }
1063
1064 /*
1065  *      IGMP handling (alias multicast ICMPv6 messages)
1066  */
1067
1068 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1069 {
1070         unsigned long delay = resptime;
1071
1072         /* Do not start timer for these addresses */
1073         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1074             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1075                 return;
1076
1077         if (del_timer(&ma->mca_timer)) {
1078                 atomic_dec(&ma->mca_refcnt);
1079                 delay = ma->mca_timer.expires - jiffies;
1080         }
1081
1082         if (delay >= resptime) {
1083                 if (resptime)
1084                         delay = net_random() % resptime;
1085                 else
1086                         delay = 1;
1087         }
1088         ma->mca_timer.expires = jiffies + delay;
1089         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1090                 atomic_inc(&ma->mca_refcnt);
1091         ma->mca_flags |= MAF_TIMER_RUNNING;
1092 }
1093
1094 /* mark EXCLUDE-mode sources */
1095 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1096         struct in6_addr *srcs)
1097 {
1098         struct ip6_sf_list *psf;
1099         int i, scount;
1100
1101         scount = 0;
1102         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1103                 if (scount == nsrcs)
1104                         break;
1105                 for (i=0; i<nsrcs; i++) {
1106                         /* skip inactive filters */
1107                         if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1108                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1109                             psf->sf_count[MCAST_EXCLUDE])
1110                                 continue;
1111                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1112                                 scount++;
1113                                 break;
1114                         }
1115                 }
1116         }
1117         pmc->mca_flags &= ~MAF_GSQUERY;
1118         if (scount == nsrcs)    /* all sources excluded */
1119                 return 0;
1120         return 1;
1121 }
1122
1123 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1124         struct in6_addr *srcs)
1125 {
1126         struct ip6_sf_list *psf;
1127         int i, scount;
1128
1129         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1130                 return mld_xmarksources(pmc, nsrcs, srcs);
1131
1132         /* mark INCLUDE-mode sources */
1133
1134         scount = 0;
1135         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1136                 if (scount == nsrcs)
1137                         break;
1138                 for (i=0; i<nsrcs; i++) {
1139                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1140                                 psf->sf_gsresp = 1;
1141                                 scount++;
1142                                 break;
1143                         }
1144                 }
1145         }
1146         if (!scount) {
1147                 pmc->mca_flags &= ~MAF_GSQUERY;
1148                 return 0;
1149         }
1150         pmc->mca_flags |= MAF_GSQUERY;
1151         return 1;
1152 }
1153
1154 int igmp6_event_query(struct sk_buff *skb)
1155 {
1156         struct mld2_query *mlh2 = NULL;
1157         struct ifmcaddr6 *ma;
1158         struct in6_addr *group;
1159         unsigned long max_delay;
1160         struct inet6_dev *idev;
1161         struct icmp6hdr *hdr;
1162         int group_type;
1163         int mark = 0;
1164         int len;
1165
1166         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1167                 return -EINVAL;
1168
1169         /* compute payload length excluding extension headers */
1170         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1171         len -= skb_network_header_len(skb);
1172
1173         /* Drop queries with not link local source */
1174         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1175                 return -EINVAL;
1176
1177         idev = in6_dev_get(skb->dev);
1178
1179         if (idev == NULL)
1180                 return 0;
1181
1182         hdr = icmp6_hdr(skb);
1183         group = (struct in6_addr *) (hdr + 1);
1184         group_type = ipv6_addr_type(group);
1185
1186         if (group_type != IPV6_ADDR_ANY &&
1187             !(group_type&IPV6_ADDR_MULTICAST)) {
1188                 in6_dev_put(idev);
1189                 return -EINVAL;
1190         }
1191
1192         if (len == 24) {
1193                 int switchback;
1194                 /* MLDv1 router present */
1195
1196                 /* Translate milliseconds to jiffies */
1197                 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1198
1199                 switchback = (idev->mc_qrv + 1) * max_delay;
1200                 idev->mc_v1_seen = jiffies + switchback;
1201
1202                 /* cancel the interface change timer */
1203                 idev->mc_ifc_count = 0;
1204                 if (del_timer(&idev->mc_ifc_timer))
1205                         __in6_dev_put(idev);
1206                 /* clear deleted report items */
1207                 mld_clear_delrec(idev);
1208         } else if (len >= 28) {
1209                 int srcs_offset = sizeof(struct mld2_query) -
1210                                   sizeof(struct icmp6hdr);
1211                 if (!pskb_may_pull(skb, srcs_offset)) {
1212                         in6_dev_put(idev);
1213                         return -EINVAL;
1214                 }
1215                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1216                 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1217                 if (!max_delay)
1218                         max_delay = 1;
1219                 idev->mc_maxdelay = max_delay;
1220                 if (mlh2->qrv)
1221                         idev->mc_qrv = mlh2->qrv;
1222                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1223                         if (mlh2->nsrcs) {
1224                                 in6_dev_put(idev);
1225                                 return -EINVAL; /* no sources allowed */
1226                         }
1227                         mld_gq_start_timer(idev);
1228                         in6_dev_put(idev);
1229                         return 0;
1230                 }
1231                 /* mark sources to include, if group & source-specific */
1232                 if (mlh2->nsrcs != 0) {
1233                         if (!pskb_may_pull(skb, srcs_offset +
1234                             ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1235                                 in6_dev_put(idev);
1236                                 return -EINVAL;
1237                         }
1238                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1239                         mark = 1;
1240                 }
1241         } else {
1242                 in6_dev_put(idev);
1243                 return -EINVAL;
1244         }
1245
1246         read_lock_bh(&idev->lock);
1247         if (group_type == IPV6_ADDR_ANY) {
1248                 for (ma = idev->mc_list; ma; ma=ma->next) {
1249                         spin_lock_bh(&ma->mca_lock);
1250                         igmp6_group_queried(ma, max_delay);
1251                         spin_unlock_bh(&ma->mca_lock);
1252                 }
1253         } else {
1254                 for (ma = idev->mc_list; ma; ma=ma->next) {
1255                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1256                                 continue;
1257                         spin_lock_bh(&ma->mca_lock);
1258                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1259                                 /* gsquery <- gsquery && mark */
1260                                 if (!mark)
1261                                         ma->mca_flags &= ~MAF_GSQUERY;
1262                         } else {
1263                                 /* gsquery <- mark */
1264                                 if (mark)
1265                                         ma->mca_flags |= MAF_GSQUERY;
1266                                 else
1267                                         ma->mca_flags &= ~MAF_GSQUERY;
1268                         }
1269                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1270                             mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1271                                 igmp6_group_queried(ma, max_delay);
1272                         spin_unlock_bh(&ma->mca_lock);
1273                         break;
1274                 }
1275         }
1276         read_unlock_bh(&idev->lock);
1277         in6_dev_put(idev);
1278
1279         return 0;
1280 }
1281
1282
1283 int igmp6_event_report(struct sk_buff *skb)
1284 {
1285         struct ifmcaddr6 *ma;
1286         struct in6_addr *addrp;
1287         struct inet6_dev *idev;
1288         struct icmp6hdr *hdr;
1289         int addr_type;
1290
1291         /* Our own report looped back. Ignore it. */
1292         if (skb->pkt_type == PACKET_LOOPBACK)
1293                 return 0;
1294
1295         /* send our report if the MC router may not have heard this report */
1296         if (skb->pkt_type != PACKET_MULTICAST &&
1297             skb->pkt_type != PACKET_BROADCAST)
1298                 return 0;
1299
1300         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1301                 return -EINVAL;
1302
1303         hdr = icmp6_hdr(skb);
1304
1305         /* Drop reports with not link local source */
1306         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1307         if (addr_type != IPV6_ADDR_ANY &&
1308             !(addr_type&IPV6_ADDR_LINKLOCAL))
1309                 return -EINVAL;
1310
1311         addrp = (struct in6_addr *) (hdr + 1);
1312
1313         idev = in6_dev_get(skb->dev);
1314         if (idev == NULL)
1315                 return -ENODEV;
1316
1317         /*
1318          *      Cancel the timer for this group
1319          */
1320
1321         read_lock_bh(&idev->lock);
1322         for (ma = idev->mc_list; ma; ma=ma->next) {
1323                 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1324                         spin_lock(&ma->mca_lock);
1325                         if (del_timer(&ma->mca_timer))
1326                                 atomic_dec(&ma->mca_refcnt);
1327                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1328                         spin_unlock(&ma->mca_lock);
1329                         break;
1330                 }
1331         }
1332         read_unlock_bh(&idev->lock);
1333         in6_dev_put(idev);
1334         return 0;
1335 }
1336
1337 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1338         int gdeleted, int sdeleted)
1339 {
1340         switch (type) {
1341         case MLD2_MODE_IS_INCLUDE:
1342         case MLD2_MODE_IS_EXCLUDE:
1343                 if (gdeleted || sdeleted)
1344                         return 0;
1345                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1346                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1347                                 return 1;
1348                         /* don't include if this source is excluded
1349                          * in all filters
1350                          */
1351                         if (psf->sf_count[MCAST_INCLUDE])
1352                                 return type == MLD2_MODE_IS_INCLUDE;
1353                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1354                                 psf->sf_count[MCAST_EXCLUDE];
1355                 }
1356                 return 0;
1357         case MLD2_CHANGE_TO_INCLUDE:
1358                 if (gdeleted || sdeleted)
1359                         return 0;
1360                 return psf->sf_count[MCAST_INCLUDE] != 0;
1361         case MLD2_CHANGE_TO_EXCLUDE:
1362                 if (gdeleted || sdeleted)
1363                         return 0;
1364                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1365                     psf->sf_count[MCAST_INCLUDE])
1366                         return 0;
1367                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1368                         psf->sf_count[MCAST_EXCLUDE];
1369         case MLD2_ALLOW_NEW_SOURCES:
1370                 if (gdeleted || !psf->sf_crcount)
1371                         return 0;
1372                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1373         case MLD2_BLOCK_OLD_SOURCES:
1374                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1375                         return gdeleted || (psf->sf_crcount && sdeleted);
1376                 return psf->sf_crcount && !gdeleted && !sdeleted;
1377         }
1378         return 0;
1379 }
1380
1381 static int
1382 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1383 {
1384         struct ip6_sf_list *psf;
1385         int scount = 0;
1386
1387         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1388                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1389                         continue;
1390                 scount++;
1391         }
1392         return scount;
1393 }
1394
1395 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1396 {
1397         struct sock *sk = igmp6_socket->sk;
1398         struct sk_buff *skb;
1399         struct mld2_report *pmr;
1400         struct in6_addr addr_buf;
1401         int err;
1402         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1403                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1404                      IPV6_TLV_PADN, 0 };
1405
1406         /* we assume size > sizeof(ra) here */
1407         skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1408
1409         if (skb == 0)
1410                 return NULL;
1411
1412         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1413
1414         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1415                 /* <draft-ietf-magma-mld-source-05.txt>:
1416                  * use unspecified address as the source address
1417                  * when a valid link-local address is not available.
1418                  */
1419                 memset(&addr_buf, 0, sizeof(addr_buf));
1420         }
1421
1422         ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1423
1424         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1425
1426         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1427         skb_put(skb, sizeof(*pmr));
1428         pmr = (struct mld2_report *)skb_transport_header(skb);
1429         pmr->type = ICMPV6_MLD2_REPORT;
1430         pmr->resv1 = 0;
1431         pmr->csum = 0;
1432         pmr->resv2 = 0;
1433         pmr->ngrec = 0;
1434         return skb;
1435 }
1436
1437 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1438 {
1439         struct net_device *dev = skb->dev;
1440
1441         if (dev->hard_header) {
1442                 unsigned char ha[MAX_ADDR_LEN];
1443                 int err;
1444
1445                 ndisc_mc_map(&ipv6_hdr(skb)->daddr, ha, dev, 1);
1446                 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1447                 if (err < 0) {
1448                         kfree_skb(skb);
1449                         return err;
1450                 }
1451         }
1452         return dev_queue_xmit(skb);
1453 }
1454
1455 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1456 {
1457         return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1458                        mld_dev_queue_xmit2);
1459 }
1460
1461 static void mld_sendpack(struct sk_buff *skb)
1462 {
1463         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1464         struct mld2_report *pmr =
1465                               (struct mld2_report *)skb_transport_header(skb);
1466         int payload_len, mldlen;
1467         struct inet6_dev *idev = in6_dev_get(skb->dev);
1468         int err;
1469
1470         IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1471         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1472         mldlen = skb->tail - skb->transport_header;
1473         pip6->payload_len = htons(payload_len);
1474
1475         pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1476                 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1477                                              mldlen, 0));
1478         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1479                 mld_dev_queue_xmit);
1480         if (!err) {
1481                 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1482                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1483         } else
1484                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1485
1486         if (likely(idev != NULL))
1487                 in6_dev_put(idev);
1488 }
1489
1490 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1491 {
1492         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1493 }
1494
1495 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1496         int type, struct mld2_grec **ppgr)
1497 {
1498         struct net_device *dev = pmc->idev->dev;
1499         struct mld2_report *pmr;
1500         struct mld2_grec *pgr;
1501
1502         if (!skb)
1503                 skb = mld_newpack(dev, dev->mtu);
1504         if (!skb)
1505                 return NULL;
1506         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1507         pgr->grec_type = type;
1508         pgr->grec_auxwords = 0;
1509         pgr->grec_nsrcs = 0;
1510         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1511         pmr = (struct mld2_report *)skb_transport_header(skb);
1512         pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1513         *ppgr = pgr;
1514         return skb;
1515 }
1516
1517 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1518         skb_tailroom(skb)) : 0)
1519
1520 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1521         int type, int gdeleted, int sdeleted)
1522 {
1523         struct net_device *dev = pmc->idev->dev;
1524         struct mld2_report *pmr;
1525         struct mld2_grec *pgr = NULL;
1526         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1527         int scount, stotal, first, isquery, truncate;
1528
1529         if (pmc->mca_flags & MAF_NOREPORT)
1530                 return skb;
1531
1532         isquery = type == MLD2_MODE_IS_INCLUDE ||
1533                   type == MLD2_MODE_IS_EXCLUDE;
1534         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1535                     type == MLD2_CHANGE_TO_EXCLUDE;
1536
1537         stotal = scount = 0;
1538
1539         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1540
1541         if (!*psf_list)
1542                 goto empty_source;
1543
1544         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1545
1546         /* EX and TO_EX get a fresh packet, if needed */
1547         if (truncate) {
1548                 if (pmr && pmr->ngrec &&
1549                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1550                         if (skb)
1551                                 mld_sendpack(skb);
1552                         skb = mld_newpack(dev, dev->mtu);
1553                 }
1554         }
1555         first = 1;
1556         psf_prev = NULL;
1557         for (psf=*psf_list; psf; psf=psf_next) {
1558                 struct in6_addr *psrc;
1559
1560                 psf_next = psf->sf_next;
1561
1562                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1563                         psf_prev = psf;
1564                         continue;
1565                 }
1566
1567                 /* clear marks on query responses */
1568                 if (isquery)
1569                         psf->sf_gsresp = 0;
1570
1571                 if (AVAILABLE(skb) < sizeof(*psrc) +
1572                     first*sizeof(struct mld2_grec)) {
1573                         if (truncate && !first)
1574                                 break;   /* truncate these */
1575                         if (pgr)
1576                                 pgr->grec_nsrcs = htons(scount);
1577                         if (skb)
1578                                 mld_sendpack(skb);
1579                         skb = mld_newpack(dev, dev->mtu);
1580                         first = 1;
1581                         scount = 0;
1582                 }
1583                 if (first) {
1584                         skb = add_grhead(skb, pmc, type, &pgr);
1585                         first = 0;
1586                 }
1587                 if (!skb)
1588                         return NULL;
1589                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1590                 *psrc = psf->sf_addr;
1591                 scount++; stotal++;
1592                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1593                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1594                         psf->sf_crcount--;
1595                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1596                                 if (psf_prev)
1597                                         psf_prev->sf_next = psf->sf_next;
1598                                 else
1599                                         *psf_list = psf->sf_next;
1600                                 kfree(psf);
1601                                 continue;
1602                         }
1603                 }
1604                 psf_prev = psf;
1605         }
1606
1607 empty_source:
1608         if (!stotal) {
1609                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1610                     type == MLD2_BLOCK_OLD_SOURCES)
1611                         return skb;
1612                 if (pmc->mca_crcount || isquery) {
1613                         /* make sure we have room for group header */
1614                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1615                                 mld_sendpack(skb);
1616                                 skb = NULL; /* add_grhead will get a new one */
1617                         }
1618                         skb = add_grhead(skb, pmc, type, &pgr);
1619                 }
1620         }
1621         if (pgr)
1622                 pgr->grec_nsrcs = htons(scount);
1623
1624         if (isquery)
1625                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1626         return skb;
1627 }
1628
1629 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1630 {
1631         struct sk_buff *skb = NULL;
1632         int type;
1633
1634         if (!pmc) {
1635                 read_lock_bh(&idev->lock);
1636                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1637                         if (pmc->mca_flags & MAF_NOREPORT)
1638                                 continue;
1639                         spin_lock_bh(&pmc->mca_lock);
1640                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1641                                 type = MLD2_MODE_IS_EXCLUDE;
1642                         else
1643                                 type = MLD2_MODE_IS_INCLUDE;
1644                         skb = add_grec(skb, pmc, type, 0, 0);
1645                         spin_unlock_bh(&pmc->mca_lock);
1646                 }
1647                 read_unlock_bh(&idev->lock);
1648         } else {
1649                 spin_lock_bh(&pmc->mca_lock);
1650                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1651                         type = MLD2_MODE_IS_EXCLUDE;
1652                 else
1653                         type = MLD2_MODE_IS_INCLUDE;
1654                 skb = add_grec(skb, pmc, type, 0, 0);
1655                 spin_unlock_bh(&pmc->mca_lock);
1656         }
1657         if (skb)
1658                 mld_sendpack(skb);
1659 }
1660
1661 /*
1662  * remove zero-count source records from a source filter list
1663  */
1664 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1665 {
1666         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1667
1668         psf_prev = NULL;
1669         for (psf=*ppsf; psf; psf = psf_next) {
1670                 psf_next = psf->sf_next;
1671                 if (psf->sf_crcount == 0) {
1672                         if (psf_prev)
1673                                 psf_prev->sf_next = psf->sf_next;
1674                         else
1675                                 *ppsf = psf->sf_next;
1676                         kfree(psf);
1677                 } else
1678                         psf_prev = psf;
1679         }
1680 }
1681
1682 static void mld_send_cr(struct inet6_dev *idev)
1683 {
1684         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1685         struct sk_buff *skb = NULL;
1686         int type, dtype;
1687
1688         read_lock_bh(&idev->lock);
1689         write_lock_bh(&idev->mc_lock);
1690
1691         /* deleted MCA's */
1692         pmc_prev = NULL;
1693         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1694                 pmc_next = pmc->next;
1695                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1696                         type = MLD2_BLOCK_OLD_SOURCES;
1697                         dtype = MLD2_BLOCK_OLD_SOURCES;
1698                         skb = add_grec(skb, pmc, type, 1, 0);
1699                         skb = add_grec(skb, pmc, dtype, 1, 1);
1700                 }
1701                 if (pmc->mca_crcount) {
1702                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1703                                 type = MLD2_CHANGE_TO_INCLUDE;
1704                                 skb = add_grec(skb, pmc, type, 1, 0);
1705                         }
1706                         pmc->mca_crcount--;
1707                         if (pmc->mca_crcount == 0) {
1708                                 mld_clear_zeros(&pmc->mca_tomb);
1709                                 mld_clear_zeros(&pmc->mca_sources);
1710                         }
1711                 }
1712                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1713                     !pmc->mca_sources) {
1714                         if (pmc_prev)
1715                                 pmc_prev->next = pmc_next;
1716                         else
1717                                 idev->mc_tomb = pmc_next;
1718                         in6_dev_put(pmc->idev);
1719                         kfree(pmc);
1720                 } else
1721                         pmc_prev = pmc;
1722         }
1723         write_unlock_bh(&idev->mc_lock);
1724
1725         /* change recs */
1726         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1727                 spin_lock_bh(&pmc->mca_lock);
1728                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1729                         type = MLD2_BLOCK_OLD_SOURCES;
1730                         dtype = MLD2_ALLOW_NEW_SOURCES;
1731                 } else {
1732                         type = MLD2_ALLOW_NEW_SOURCES;
1733                         dtype = MLD2_BLOCK_OLD_SOURCES;
1734                 }
1735                 skb = add_grec(skb, pmc, type, 0, 0);
1736                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1737
1738                 /* filter mode changes */
1739                 if (pmc->mca_crcount) {
1740                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1741                                 type = MLD2_CHANGE_TO_EXCLUDE;
1742                         else
1743                                 type = MLD2_CHANGE_TO_INCLUDE;
1744                         skb = add_grec(skb, pmc, type, 0, 0);
1745                         pmc->mca_crcount--;
1746                 }
1747                 spin_unlock_bh(&pmc->mca_lock);
1748         }
1749         read_unlock_bh(&idev->lock);
1750         if (!skb)
1751                 return;
1752         (void) mld_sendpack(skb);
1753 }
1754
1755 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1756 {
1757         struct sock *sk = igmp6_socket->sk;
1758         struct inet6_dev *idev;
1759         struct sk_buff *skb;
1760         struct icmp6hdr *hdr;
1761         struct in6_addr *snd_addr;
1762         struct in6_addr *addrp;
1763         struct in6_addr addr_buf;
1764         struct in6_addr all_routers;
1765         int err, len, payload_len, full_len;
1766         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1767                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1768                      IPV6_TLV_PADN, 0 };
1769
1770         rcu_read_lock();
1771         IP6_INC_STATS(__in6_dev_get(dev),
1772                       IPSTATS_MIB_OUTREQUESTS);
1773         rcu_read_unlock();
1774         snd_addr = addr;
1775         if (type == ICMPV6_MGM_REDUCTION) {
1776                 snd_addr = &all_routers;
1777                 ipv6_addr_all_routers(&all_routers);
1778         }
1779
1780         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1781         payload_len = len + sizeof(ra);
1782         full_len = sizeof(struct ipv6hdr) + payload_len;
1783
1784         skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1785
1786         if (skb == NULL) {
1787                 rcu_read_lock();
1788                 IP6_INC_STATS(__in6_dev_get(dev),
1789                               IPSTATS_MIB_OUTDISCARDS);
1790                 rcu_read_unlock();
1791                 return;
1792         }
1793
1794         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1795
1796         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1797                 /* <draft-ietf-magma-mld-source-05.txt>:
1798                  * use unspecified address as the source address
1799                  * when a valid link-local address is not available.
1800                  */
1801                 memset(&addr_buf, 0, sizeof(addr_buf));
1802         }
1803
1804         ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1805
1806         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1807
1808         hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1809         memset(hdr, 0, sizeof(struct icmp6hdr));
1810         hdr->icmp6_type = type;
1811
1812         addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1813         ipv6_addr_copy(addrp, addr);
1814
1815         hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1816                                            IPPROTO_ICMPV6,
1817                                            csum_partial((__u8 *) hdr, len, 0));
1818
1819         idev = in6_dev_get(skb->dev);
1820
1821         err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
1822                 mld_dev_queue_xmit);
1823         if (!err) {
1824                 if (type == ICMPV6_MGM_REDUCTION)
1825                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1826                 else
1827                         ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1828                 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1829                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1830         } else
1831                 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1832
1833         if (likely(idev != NULL))
1834                 in6_dev_put(idev);
1835         return;
1836 }
1837
1838 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1839         struct in6_addr *psfsrc)
1840 {
1841         struct ip6_sf_list *psf, *psf_prev;
1842         int rv = 0;
1843
1844         psf_prev = NULL;
1845         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1846                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1847                         break;
1848                 psf_prev = psf;
1849         }
1850         if (!psf || psf->sf_count[sfmode] == 0) {
1851                 /* source filter not found, or count wrong =>  bug */
1852                 return -ESRCH;
1853         }
1854         psf->sf_count[sfmode]--;
1855         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1856                 struct inet6_dev *idev = pmc->idev;
1857
1858                 /* no more filters for this source */
1859                 if (psf_prev)
1860                         psf_prev->sf_next = psf->sf_next;
1861                 else
1862                         pmc->mca_sources = psf->sf_next;
1863                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1864                     !MLD_V1_SEEN(idev)) {
1865                         psf->sf_crcount = idev->mc_qrv;
1866                         psf->sf_next = pmc->mca_tomb;
1867                         pmc->mca_tomb = psf;
1868                         rv = 1;
1869                 } else
1870                         kfree(psf);
1871         }
1872         return rv;
1873 }
1874
1875 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1876                           int sfmode, int sfcount, struct in6_addr *psfsrc,
1877                           int delta)
1878 {
1879         struct ifmcaddr6 *pmc;
1880         int     changerec = 0;
1881         int     i, err;
1882
1883         if (!idev)
1884                 return -ENODEV;
1885         read_lock_bh(&idev->lock);
1886         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1887                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1888                         break;
1889         }
1890         if (!pmc) {
1891                 /* MCA not found?? bug */
1892                 read_unlock_bh(&idev->lock);
1893                 return -ESRCH;
1894         }
1895         spin_lock_bh(&pmc->mca_lock);
1896         sf_markstate(pmc);
1897         if (!delta) {
1898                 if (!pmc->mca_sfcount[sfmode]) {
1899                         spin_unlock_bh(&pmc->mca_lock);
1900                         read_unlock_bh(&idev->lock);
1901                         return -EINVAL;
1902                 }
1903                 pmc->mca_sfcount[sfmode]--;
1904         }
1905         err = 0;
1906         for (i=0; i<sfcount; i++) {
1907                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1908
1909                 changerec |= rv > 0;
1910                 if (!err && rv < 0)
1911                         err = rv;
1912         }
1913         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1914             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1915             pmc->mca_sfcount[MCAST_INCLUDE]) {
1916                 struct ip6_sf_list *psf;
1917
1918                 /* filter mode change */
1919                 pmc->mca_sfmode = MCAST_INCLUDE;
1920                 pmc->mca_crcount = idev->mc_qrv;
1921                 idev->mc_ifc_count = pmc->mca_crcount;
1922                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1923                         psf->sf_crcount = 0;
1924                 mld_ifc_event(pmc->idev);
1925         } else if (sf_setstate(pmc) || changerec)
1926                 mld_ifc_event(pmc->idev);
1927         spin_unlock_bh(&pmc->mca_lock);
1928         read_unlock_bh(&idev->lock);
1929         return err;
1930 }
1931
1932 /*
1933  * Add multicast single-source filter to the interface list
1934  */
1935 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1936         struct in6_addr *psfsrc, int delta)
1937 {
1938         struct ip6_sf_list *psf, *psf_prev;
1939
1940         psf_prev = NULL;
1941         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1942                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1943                         break;
1944                 psf_prev = psf;
1945         }
1946         if (!psf) {
1947                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1948                 if (!psf)
1949                         return -ENOBUFS;
1950
1951                 psf->sf_addr = *psfsrc;
1952                 if (psf_prev) {
1953                         psf_prev->sf_next = psf;
1954                 } else
1955                         pmc->mca_sources = psf;
1956         }
1957         psf->sf_count[sfmode]++;
1958         return 0;
1959 }
1960
1961 static void sf_markstate(struct ifmcaddr6 *pmc)
1962 {
1963         struct ip6_sf_list *psf;
1964         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1965
1966         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1967                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1968                         psf->sf_oldin = mca_xcount ==
1969                                 psf->sf_count[MCAST_EXCLUDE] &&
1970                                 !psf->sf_count[MCAST_INCLUDE];
1971                 } else
1972                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1973 }
1974
1975 static int sf_setstate(struct ifmcaddr6 *pmc)
1976 {
1977         struct ip6_sf_list *psf, *dpsf;
1978         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1979         int qrv = pmc->idev->mc_qrv;
1980         int new_in, rv;
1981
1982         rv = 0;
1983         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1984                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1985                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1986                                 !psf->sf_count[MCAST_INCLUDE];
1987                 } else
1988                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1989                 if (new_in) {
1990                         if (!psf->sf_oldin) {
1991                                 struct ip6_sf_list *prev = NULL;
1992
1993                                 for (dpsf=pmc->mca_tomb; dpsf;
1994                                      dpsf=dpsf->sf_next) {
1995                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1996                                             &psf->sf_addr))
1997                                                 break;
1998                                         prev = dpsf;
1999                                 }
2000                                 if (dpsf) {
2001                                         if (prev)
2002                                                 prev->sf_next = dpsf->sf_next;
2003                                         else
2004                                                 pmc->mca_tomb = dpsf->sf_next;
2005                                         kfree(dpsf);
2006                                 }
2007                                 psf->sf_crcount = qrv;
2008                                 rv++;
2009                         }
2010                 } else if (psf->sf_oldin) {
2011                         psf->sf_crcount = 0;
2012                         /*
2013                          * add or update "delete" records if an active filter
2014                          * is now inactive
2015                          */
2016                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2017                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2018                                     &psf->sf_addr))
2019                                         break;
2020                         if (!dpsf) {
2021                                 dpsf = (struct ip6_sf_list *)
2022                                         kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2023                                 if (!dpsf)
2024                                         continue;
2025                                 *dpsf = *psf;
2026                                 /* pmc->mca_lock held by callers */
2027                                 dpsf->sf_next = pmc->mca_tomb;
2028                                 pmc->mca_tomb = dpsf;
2029                         }
2030                         dpsf->sf_crcount = qrv;
2031                         rv++;
2032                 }
2033         }
2034         return rv;
2035 }
2036
2037 /*
2038  * Add multicast source filter list to the interface list
2039  */
2040 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2041                           int sfmode, int sfcount, struct in6_addr *psfsrc,
2042                           int delta)
2043 {
2044         struct ifmcaddr6 *pmc;
2045         int     isexclude;
2046         int     i, err;
2047
2048         if (!idev)
2049                 return -ENODEV;
2050         read_lock_bh(&idev->lock);
2051         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2052                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2053                         break;
2054         }
2055         if (!pmc) {
2056                 /* MCA not found?? bug */
2057                 read_unlock_bh(&idev->lock);
2058                 return -ESRCH;
2059         }
2060         spin_lock_bh(&pmc->mca_lock);
2061
2062         sf_markstate(pmc);
2063         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2064         if (!delta)
2065                 pmc->mca_sfcount[sfmode]++;
2066         err = 0;
2067         for (i=0; i<sfcount; i++) {
2068                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2069                 if (err)
2070                         break;
2071         }
2072         if (err) {
2073                 int j;
2074
2075                 if (!delta)
2076                         pmc->mca_sfcount[sfmode]--;
2077                 for (j=0; j<i; j++)
2078                         (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2079         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2080                 struct inet6_dev *idev = pmc->idev;
2081                 struct ip6_sf_list *psf;
2082
2083                 /* filter mode change */
2084                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2085                         pmc->mca_sfmode = MCAST_EXCLUDE;
2086                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2087                         pmc->mca_sfmode = MCAST_INCLUDE;
2088                 /* else no filters; keep old mode for reports */
2089
2090                 pmc->mca_crcount = idev->mc_qrv;
2091                 idev->mc_ifc_count = pmc->mca_crcount;
2092                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2093                         psf->sf_crcount = 0;
2094                 mld_ifc_event(idev);
2095         } else if (sf_setstate(pmc))
2096                 mld_ifc_event(idev);
2097         spin_unlock_bh(&pmc->mca_lock);
2098         read_unlock_bh(&idev->lock);
2099         return err;
2100 }
2101
2102 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2103 {
2104         struct ip6_sf_list *psf, *nextpsf;
2105
2106         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2107                 nextpsf = psf->sf_next;
2108                 kfree(psf);
2109         }
2110         pmc->mca_tomb = NULL;
2111         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2112                 nextpsf = psf->sf_next;
2113                 kfree(psf);
2114         }
2115         pmc->mca_sources = NULL;
2116         pmc->mca_sfmode = MCAST_EXCLUDE;
2117         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2118         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2119 }
2120
2121
2122 static void igmp6_join_group(struct ifmcaddr6 *ma)
2123 {
2124         unsigned long delay;
2125
2126         if (ma->mca_flags & MAF_NOREPORT)
2127                 return;
2128
2129         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2130
2131         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2132
2133         spin_lock_bh(&ma->mca_lock);
2134         if (del_timer(&ma->mca_timer)) {
2135                 atomic_dec(&ma->mca_refcnt);
2136                 delay = ma->mca_timer.expires - jiffies;
2137         }
2138
2139         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2140                 atomic_inc(&ma->mca_refcnt);
2141         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2142         spin_unlock_bh(&ma->mca_lock);
2143 }
2144
2145 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2146                             struct inet6_dev *idev)
2147 {
2148         int err;
2149
2150         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2151          * so no other readers or writers of iml or its sflist
2152          */
2153         if (iml->sflist == 0) {
2154                 /* any-source empty exclude case */
2155                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2156         }
2157         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2158                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2159         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2160         iml->sflist = NULL;
2161         return err;
2162 }
2163
2164 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2165 {
2166         if (MLD_V1_SEEN(ma->idev)) {
2167                 if (ma->mca_flags & MAF_LAST_REPORTER)
2168                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2169                                 ICMPV6_MGM_REDUCTION);
2170         } else {
2171                 mld_add_delrec(ma->idev, ma);
2172                 mld_ifc_event(ma->idev);
2173         }
2174 }
2175
2176 static void mld_gq_timer_expire(unsigned long data)
2177 {
2178         struct inet6_dev *idev = (struct inet6_dev *)data;
2179
2180         idev->mc_gq_running = 0;
2181         mld_send_report(idev, NULL);
2182         __in6_dev_put(idev);
2183 }
2184
2185 static void mld_ifc_timer_expire(unsigned long data)
2186 {
2187         struct inet6_dev *idev = (struct inet6_dev *)data;
2188
2189         mld_send_cr(idev);
2190         if (idev->mc_ifc_count) {
2191                 idev->mc_ifc_count--;
2192                 if (idev->mc_ifc_count)
2193                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2194         }
2195         __in6_dev_put(idev);
2196 }
2197
2198 static void mld_ifc_event(struct inet6_dev *idev)
2199 {
2200         if (MLD_V1_SEEN(idev))
2201                 return;
2202         idev->mc_ifc_count = idev->mc_qrv;
2203         mld_ifc_start_timer(idev, 1);
2204 }
2205
2206
2207 static void igmp6_timer_handler(unsigned long data)
2208 {
2209         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2210
2211         if (MLD_V1_SEEN(ma->idev))
2212                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2213         else
2214                 mld_send_report(ma->idev, ma);
2215
2216         spin_lock(&ma->mca_lock);
2217         ma->mca_flags |=  MAF_LAST_REPORTER;
2218         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2219         spin_unlock(&ma->mca_lock);
2220         ma_put(ma);
2221 }
2222
2223 /* Device going down */
2224
2225 void ipv6_mc_down(struct inet6_dev *idev)
2226 {
2227         struct ifmcaddr6 *i;
2228
2229         /* Withdraw multicast list */
2230
2231         read_lock_bh(&idev->lock);
2232         idev->mc_ifc_count = 0;
2233         if (del_timer(&idev->mc_ifc_timer))
2234                 __in6_dev_put(idev);
2235         idev->mc_gq_running = 0;
2236         if (del_timer(&idev->mc_gq_timer))
2237                 __in6_dev_put(idev);
2238
2239         for (i = idev->mc_list; i; i=i->next)
2240                 igmp6_group_dropped(i);
2241         read_unlock_bh(&idev->lock);
2242
2243         mld_clear_delrec(idev);
2244 }
2245
2246
2247 /* Device going up */
2248
2249 void ipv6_mc_up(struct inet6_dev *idev)
2250 {
2251         struct ifmcaddr6 *i;
2252
2253         /* Install multicast list, except for all-nodes (already installed) */
2254
2255         read_lock_bh(&idev->lock);
2256         for (i = idev->mc_list; i; i=i->next)
2257                 igmp6_group_added(i);
2258         read_unlock_bh(&idev->lock);
2259 }
2260
2261 /* IPv6 device initialization. */
2262
2263 void ipv6_mc_init_dev(struct inet6_dev *idev)
2264 {
2265         write_lock_bh(&idev->lock);
2266         rwlock_init(&idev->mc_lock);
2267         idev->mc_gq_running = 0;
2268         init_timer(&idev->mc_gq_timer);
2269         idev->mc_gq_timer.data = (unsigned long) idev;
2270         idev->mc_gq_timer.function = &mld_gq_timer_expire;
2271         idev->mc_tomb = NULL;
2272         idev->mc_ifc_count = 0;
2273         init_timer(&idev->mc_ifc_timer);
2274         idev->mc_ifc_timer.data = (unsigned long) idev;
2275         idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2276         idev->mc_qrv = MLD_QRV_DEFAULT;
2277         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2278         idev->mc_v1_seen = 0;
2279         write_unlock_bh(&idev->lock);
2280 }
2281
2282 /*
2283  *      Device is about to be destroyed: clean up.
2284  */
2285
2286 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2287 {
2288         struct ifmcaddr6 *i;
2289         struct in6_addr maddr;
2290
2291         /* Deactivate timers */
2292         ipv6_mc_down(idev);
2293
2294         /* Delete all-nodes address. */
2295         ipv6_addr_all_nodes(&maddr);
2296
2297         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2298          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2299          * fail.
2300          */
2301         __ipv6_dev_mc_dec(idev, &maddr);
2302
2303         if (idev->cnf.forwarding) {
2304                 ipv6_addr_all_routers(&maddr);
2305                 __ipv6_dev_mc_dec(idev, &maddr);
2306         }
2307
2308         write_lock_bh(&idev->lock);
2309         while ((i = idev->mc_list) != NULL) {
2310                 idev->mc_list = i->next;
2311                 write_unlock_bh(&idev->lock);
2312
2313                 igmp6_group_dropped(i);
2314                 ma_put(i);
2315
2316                 write_lock_bh(&idev->lock);
2317         }
2318         write_unlock_bh(&idev->lock);
2319 }
2320
2321 #ifdef CONFIG_PROC_FS
2322 struct igmp6_mc_iter_state {
2323         struct net_device *dev;
2324         struct inet6_dev *idev;
2325 };
2326
2327 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2328
2329 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2330 {
2331         struct ifmcaddr6 *im = NULL;
2332         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2333
2334         state->idev = NULL;
2335         for_each_netdev(state->dev) {
2336                 struct inet6_dev *idev;
2337                 idev = in6_dev_get(state->dev);
2338                 if (!idev)
2339                         continue;
2340                 read_lock_bh(&idev->lock);
2341                 im = idev->mc_list;
2342                 if (im) {
2343                         state->idev = idev;
2344                         break;
2345                 }
2346                 read_unlock_bh(&idev->lock);
2347                 in6_dev_put(idev);
2348         }
2349         return im;
2350 }
2351
2352 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2353 {
2354         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2355
2356         im = im->next;
2357         while (!im) {
2358                 if (likely(state->idev != NULL)) {
2359                         read_unlock_bh(&state->idev->lock);
2360                         in6_dev_put(state->idev);
2361                 }
2362                 state->dev = next_net_device(state->dev);
2363                 if (!state->dev) {
2364                         state->idev = NULL;
2365                         break;
2366                 }
2367                 state->idev = in6_dev_get(state->dev);
2368                 if (!state->idev)
2369                         continue;
2370                 read_lock_bh(&state->idev->lock);
2371                 im = state->idev->mc_list;
2372         }
2373         return im;
2374 }
2375
2376 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2377 {
2378         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2379         if (im)
2380                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2381                         --pos;
2382         return pos ? NULL : im;
2383 }
2384
2385 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2386 {
2387         read_lock(&dev_base_lock);
2388         return igmp6_mc_get_idx(seq, *pos);
2389 }
2390
2391 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2392 {
2393         struct ifmcaddr6 *im;
2394         im = igmp6_mc_get_next(seq, v);
2395         ++*pos;
2396         return im;
2397 }
2398
2399 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2400 {
2401         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2402         if (likely(state->idev != NULL)) {
2403                 read_unlock_bh(&state->idev->lock);
2404                 in6_dev_put(state->idev);
2405                 state->idev = NULL;
2406         }
2407         state->dev = NULL;
2408         read_unlock(&dev_base_lock);
2409 }
2410
2411 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2412 {
2413         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2414         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2415
2416         seq_printf(seq,
2417                    "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2418                    state->dev->ifindex, state->dev->name,
2419                    NIP6(im->mca_addr),
2420                    im->mca_users, im->mca_flags,
2421                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2422                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2423         return 0;
2424 }
2425
2426 static struct seq_operations igmp6_mc_seq_ops = {
2427         .start  =       igmp6_mc_seq_start,
2428         .next   =       igmp6_mc_seq_next,
2429         .stop   =       igmp6_mc_seq_stop,
2430         .show   =       igmp6_mc_seq_show,
2431 };
2432
2433 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2434 {
2435         struct seq_file *seq;
2436         int rc = -ENOMEM;
2437         struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2438
2439         if (!s)
2440                 goto out;
2441
2442         rc = seq_open(file, &igmp6_mc_seq_ops);
2443         if (rc)
2444                 goto out_kfree;
2445
2446         seq = file->private_data;
2447         seq->private = s;
2448 out:
2449         return rc;
2450 out_kfree:
2451         kfree(s);
2452         goto out;
2453 }
2454
2455 static const struct file_operations igmp6_mc_seq_fops = {
2456         .owner          =       THIS_MODULE,
2457         .open           =       igmp6_mc_seq_open,
2458         .read           =       seq_read,
2459         .llseek         =       seq_lseek,
2460         .release        =       seq_release_private,
2461 };
2462
2463 struct igmp6_mcf_iter_state {
2464         struct net_device *dev;
2465         struct inet6_dev *idev;
2466         struct ifmcaddr6 *im;
2467 };
2468
2469 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2470
2471 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2472 {
2473         struct ip6_sf_list *psf = NULL;
2474         struct ifmcaddr6 *im = NULL;
2475         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2476
2477         state->idev = NULL;
2478         state->im = NULL;
2479         for_each_netdev(state->dev) {
2480                 struct inet6_dev *idev;
2481                 idev = in6_dev_get(state->dev);
2482                 if (unlikely(idev == NULL))
2483                         continue;
2484                 read_lock_bh(&idev->lock);
2485                 im = idev->mc_list;
2486                 if (likely(im != NULL)) {
2487                         spin_lock_bh(&im->mca_lock);
2488                         psf = im->mca_sources;
2489                         if (likely(psf != NULL)) {
2490                                 state->im = im;
2491                                 state->idev = idev;
2492                                 break;
2493                         }
2494                         spin_unlock_bh(&im->mca_lock);
2495                 }
2496                 read_unlock_bh(&idev->lock);
2497                 in6_dev_put(idev);
2498         }
2499         return psf;
2500 }
2501
2502 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2503 {
2504         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2505
2506         psf = psf->sf_next;
2507         while (!psf) {
2508                 spin_unlock_bh(&state->im->mca_lock);
2509                 state->im = state->im->next;
2510                 while (!state->im) {
2511                         if (likely(state->idev != NULL)) {
2512                                 read_unlock_bh(&state->idev->lock);
2513                                 in6_dev_put(state->idev);
2514                         }
2515                         state->dev = next_net_device(state->dev);
2516                         if (!state->dev) {
2517                                 state->idev = NULL;
2518                                 goto out;
2519                         }
2520                         state->idev = in6_dev_get(state->dev);
2521                         if (!state->idev)
2522                                 continue;
2523                         read_lock_bh(&state->idev->lock);
2524                         state->im = state->idev->mc_list;
2525                 }
2526                 if (!state->im)
2527                         break;
2528                 spin_lock_bh(&state->im->mca_lock);
2529                 psf = state->im->mca_sources;
2530         }
2531 out:
2532         return psf;
2533 }
2534
2535 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2536 {
2537         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2538         if (psf)
2539                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2540                         --pos;
2541         return pos ? NULL : psf;
2542 }
2543
2544 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2545 {
2546         read_lock(&dev_base_lock);
2547         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2548 }
2549
2550 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2551 {
2552         struct ip6_sf_list *psf;
2553         if (v == SEQ_START_TOKEN)
2554                 psf = igmp6_mcf_get_first(seq);
2555         else
2556                 psf = igmp6_mcf_get_next(seq, v);
2557         ++*pos;
2558         return psf;
2559 }
2560
2561 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2562 {
2563         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2564         if (likely(state->im != NULL)) {
2565                 spin_unlock_bh(&state->im->mca_lock);
2566                 state->im = NULL;
2567         }
2568         if (likely(state->idev != NULL)) {
2569                 read_unlock_bh(&state->idev->lock);
2570                 in6_dev_put(state->idev);
2571                 state->idev = NULL;
2572         }
2573         state->dev = NULL;
2574         read_unlock(&dev_base_lock);
2575 }
2576
2577 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2578 {
2579         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2580         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2581
2582         if (v == SEQ_START_TOKEN) {
2583                 seq_printf(seq,
2584                            "%3s %6s "
2585                            "%32s %32s %6s %6s\n", "Idx",
2586                            "Device", "Multicast Address",
2587                            "Source Address", "INC", "EXC");
2588         } else {
2589                 seq_printf(seq,
2590                            "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2591                            state->dev->ifindex, state->dev->name,
2592                            NIP6(state->im->mca_addr),
2593                            NIP6(psf->sf_addr),
2594                            psf->sf_count[MCAST_INCLUDE],
2595                            psf->sf_count[MCAST_EXCLUDE]);
2596         }
2597         return 0;
2598 }
2599
2600 static struct seq_operations igmp6_mcf_seq_ops = {
2601         .start  =       igmp6_mcf_seq_start,
2602         .next   =       igmp6_mcf_seq_next,
2603         .stop   =       igmp6_mcf_seq_stop,
2604         .show   =       igmp6_mcf_seq_show,
2605 };
2606
2607 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2608 {
2609         struct seq_file *seq;
2610         int rc = -ENOMEM;
2611         struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
2612
2613         if (!s)
2614                 goto out;
2615
2616         rc = seq_open(file, &igmp6_mcf_seq_ops);
2617         if (rc)
2618                 goto out_kfree;
2619
2620         seq = file->private_data;
2621         seq->private = s;
2622 out:
2623         return rc;
2624 out_kfree:
2625         kfree(s);
2626         goto out;
2627 }
2628
2629 static const struct file_operations igmp6_mcf_seq_fops = {
2630         .owner          =       THIS_MODULE,
2631         .open           =       igmp6_mcf_seq_open,
2632         .read           =       seq_read,
2633         .llseek         =       seq_lseek,
2634         .release        =       seq_release_private,
2635 };
2636 #endif
2637
2638 int __init igmp6_init(struct net_proto_family *ops)
2639 {
2640         struct ipv6_pinfo *np;
2641         struct sock *sk;
2642         int err;
2643
2644         err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2645         if (err < 0) {
2646                 printk(KERN_ERR
2647                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2648                        err);
2649                 igmp6_socket = NULL; /* For safety. */
2650                 return err;
2651         }
2652
2653         sk = igmp6_socket->sk;
2654         sk->sk_allocation = GFP_ATOMIC;
2655         sk->sk_prot->unhash(sk);
2656
2657         np = inet6_sk(sk);
2658         np->hop_limit = 1;
2659
2660 #ifdef CONFIG_PROC_FS
2661         proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2662         proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2663 #endif
2664
2665         return 0;
2666 }
2667
2668 void igmp6_cleanup(void)
2669 {
2670         sock_release(igmp6_socket);
2671         igmp6_socket = NULL; /* for safety */
2672
2673 #ifdef CONFIG_PROC_FS
2674         proc_net_remove("mcfilter6");
2675         proc_net_remove("igmp6");
2676 #endif
2677 }