4f12b660045d948502b2fe648de059435a835523
[pandora-kernel.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  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9  *
10  *      This program is free software; you can redistribute it and/or
11  *      modify it under the terms of the GNU General Public License
12  *      as published by the Free Software Foundation; either version
13  *      2 of the License, or (at your option) any later version.
14  */
15
16 /* Changes:
17  *
18  *      yoshfuji        : fix format of router-alert option
19  *      YOSHIFUJI Hideaki @USAGI:
20  *              Fixed source address for MLD message based on
21  *              <draft-ietf-magma-mld-source-05.txt>.
22  *      YOSHIFUJI Hideaki @USAGI:
23  *              - Ignore Queries for invalid addresses.
24  *              - MLD for link-local addresses.
25  *      David L Stevens <dlstevens@us.ibm.com>:
26  *              - MLDv2 support
27  */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <net/mld.h>
48
49 #include <linux/netfilter.h>
50 #include <linux/netfilter_ipv6.h>
51
52 #include <net/net_namespace.h>
53 #include <net/sock.h>
54 #include <net/snmp.h>
55
56 #include <net/ipv6.h>
57 #include <net/protocol.h>
58 #include <net/if_inet6.h>
59 #include <net/ndisc.h>
60 #include <net/addrconf.h>
61 #include <net/ip6_route.h>
62 #include <net/inet_common.h>
63
64 #include <net/ip6_checksum.h>
65
66 /* Set to 3 to get tracing... */
67 #define MCAST_DEBUG 2
68
69 #if MCAST_DEBUG >= 3
70 #define MDBG(x) printk x
71 #else
72 #define MDBG(x)
73 #endif
74
75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
80 };
81
82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
83
84 /* Big mc list lock for all the sockets */
85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
86
87 static void igmp6_join_group(struct ifmcaddr6 *ma);
88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
89 static void igmp6_timer_handler(unsigned long data);
90
91 static void mld_gq_timer_expire(unsigned long data);
92 static void mld_ifc_timer_expire(unsigned long data);
93 static void mld_ifc_event(struct inet6_dev *idev);
94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
96 static void mld_clear_delrec(struct inet6_dev *idev);
97 static int sf_setstate(struct ifmcaddr6 *pmc);
98 static void sf_markstate(struct ifmcaddr6 *pmc);
99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
101                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
102                           int delta);
103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
104                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
105                           int delta);
106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107                             struct inet6_dev *idev);
108
109
110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
111 #define MLD_QRV_DEFAULT         2
112
113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
114                 (idev)->cnf.force_mld_version == 1 || \
115                 ((idev)->mc_v1_seen && \
116                 time_before(jiffies, (idev)->mc_v1_seen)))
117
118 #define IPV6_MLD_MAX_MSF        64
119
120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
121
122 /*
123  *      socket join on multicast group
124  */
125
126 #define for_each_pmc_rcu(np, pmc)                               \
127         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
128              pmc != NULL;                                       \
129              pmc = rcu_dereference(pmc->next))
130
131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
132 {
133         struct net_device *dev = NULL;
134         struct ipv6_mc_socklist *mc_lst;
135         struct ipv6_pinfo *np = inet6_sk(sk);
136         struct net *net = sock_net(sk);
137         int err;
138
139         if (!ipv6_addr_is_multicast(addr))
140                 return -EINVAL;
141
142         rcu_read_lock();
143         for_each_pmc_rcu(np, mc_lst) {
144                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145                     ipv6_addr_equal(&mc_lst->addr, addr)) {
146                         rcu_read_unlock();
147                         return -EADDRINUSE;
148                 }
149         }
150         rcu_read_unlock();
151
152         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
153
154         if (mc_lst == NULL)
155                 return -ENOMEM;
156
157         mc_lst->next = NULL;
158         ipv6_addr_copy(&mc_lst->addr, addr);
159
160         rcu_read_lock();
161         if (ifindex == 0) {
162                 struct rt6_info *rt;
163                 rt = rt6_lookup(net, addr, NULL, 0, 0);
164                 if (rt) {
165                         dev = rt->rt6i_dev;
166                         dst_release(&rt->dst);
167                 }
168         } else
169                 dev = dev_get_by_index_rcu(net, ifindex);
170
171         if (dev == NULL) {
172                 rcu_read_unlock();
173                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174                 return -ENODEV;
175         }
176
177         mc_lst->ifindex = dev->ifindex;
178         mc_lst->sfmode = MCAST_EXCLUDE;
179         rwlock_init(&mc_lst->sflock);
180         mc_lst->sflist = NULL;
181
182         /*
183          *      now add/increase the group membership on the device
184          */
185
186         err = ipv6_dev_mc_inc(dev, addr);
187
188         if (err) {
189                 rcu_read_unlock();
190                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191                 return err;
192         }
193
194         spin_lock(&ipv6_sk_mc_lock);
195         mc_lst->next = np->ipv6_mc_list;
196         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197         spin_unlock(&ipv6_sk_mc_lock);
198
199         rcu_read_unlock();
200
201         return 0;
202 }
203
204 /*
205  *      socket leave on multicast group
206  */
207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 {
209         struct ipv6_pinfo *np = inet6_sk(sk);
210         struct ipv6_mc_socklist *mc_lst;
211         struct ipv6_mc_socklist __rcu **lnk;
212         struct net *net = sock_net(sk);
213
214         spin_lock(&ipv6_sk_mc_lock);
215         for (lnk = &np->ipv6_mc_list;
216              (mc_lst = rcu_dereference_protected(*lnk,
217                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
218               lnk = &mc_lst->next) {
219                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
220                     ipv6_addr_equal(&mc_lst->addr, addr)) {
221                         struct net_device *dev;
222
223                         *lnk = mc_lst->next;
224                         spin_unlock(&ipv6_sk_mc_lock);
225
226                         rcu_read_lock();
227                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
228                         if (dev != NULL) {
229                                 struct inet6_dev *idev = __in6_dev_get(dev);
230
231                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
232                                 if (idev)
233                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
234                         } else
235                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
236                         rcu_read_unlock();
237                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
238                         kfree_rcu(mc_lst, rcu);
239                         return 0;
240                 }
241         }
242         spin_unlock(&ipv6_sk_mc_lock);
243
244         return -EADDRNOTAVAIL;
245 }
246
247 /* called with rcu_read_lock() */
248 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
249                                              const struct in6_addr *group,
250                                              int ifindex)
251 {
252         struct net_device *dev = NULL;
253         struct inet6_dev *idev = NULL;
254
255         if (ifindex == 0) {
256                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
257
258                 if (rt) {
259                         dev = rt->rt6i_dev;
260                         dst_release(&rt->dst);
261                 }
262         } else
263                 dev = dev_get_by_index_rcu(net, ifindex);
264
265         if (!dev)
266                 return NULL;
267         idev = __in6_dev_get(dev);
268         if (!idev)
269                 return NULL;
270         read_lock_bh(&idev->lock);
271         if (idev->dead) {
272                 read_unlock_bh(&idev->lock);
273                 return NULL;
274         }
275         return idev;
276 }
277
278 void ipv6_sock_mc_close(struct sock *sk)
279 {
280         struct ipv6_pinfo *np = inet6_sk(sk);
281         struct ipv6_mc_socklist *mc_lst;
282         struct net *net = sock_net(sk);
283
284         spin_lock(&ipv6_sk_mc_lock);
285         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
286                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
287                 struct net_device *dev;
288
289                 np->ipv6_mc_list = mc_lst->next;
290                 spin_unlock(&ipv6_sk_mc_lock);
291
292                 rcu_read_lock();
293                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
294                 if (dev) {
295                         struct inet6_dev *idev = __in6_dev_get(dev);
296
297                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
298                         if (idev)
299                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
300                 } else
301                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
302                 rcu_read_unlock();
303
304                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
305                 kfree_rcu(mc_lst, rcu);
306
307                 spin_lock(&ipv6_sk_mc_lock);
308         }
309         spin_unlock(&ipv6_sk_mc_lock);
310 }
311
312 int ip6_mc_source(int add, int omode, struct sock *sk,
313         struct group_source_req *pgsr)
314 {
315         struct in6_addr *source, *group;
316         struct ipv6_mc_socklist *pmc;
317         struct inet6_dev *idev;
318         struct ipv6_pinfo *inet6 = inet6_sk(sk);
319         struct ip6_sf_socklist *psl;
320         struct net *net = sock_net(sk);
321         int i, j, rv;
322         int leavegroup = 0;
323         int pmclocked = 0;
324         int err;
325
326         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
327         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
328
329         if (!ipv6_addr_is_multicast(group))
330                 return -EINVAL;
331
332         rcu_read_lock();
333         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
334         if (!idev) {
335                 rcu_read_unlock();
336                 return -ENODEV;
337         }
338
339         err = -EADDRNOTAVAIL;
340
341         for_each_pmc_rcu(inet6, pmc) {
342                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
343                         continue;
344                 if (ipv6_addr_equal(&pmc->addr, group))
345                         break;
346         }
347         if (!pmc) {             /* must have a prior join */
348                 err = -EINVAL;
349                 goto done;
350         }
351         /* if a source filter was set, must be the same mode as before */
352         if (pmc->sflist) {
353                 if (pmc->sfmode != omode) {
354                         err = -EINVAL;
355                         goto done;
356                 }
357         } else if (pmc->sfmode != omode) {
358                 /* allow mode switches for empty-set filters */
359                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
360                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
361                 pmc->sfmode = omode;
362         }
363
364         write_lock(&pmc->sflock);
365         pmclocked = 1;
366
367         psl = pmc->sflist;
368         if (!add) {
369                 if (!psl)
370                         goto done;      /* err = -EADDRNOTAVAIL */
371                 rv = !0;
372                 for (i=0; i<psl->sl_count; i++) {
373                         rv = memcmp(&psl->sl_addr[i], source,
374                                 sizeof(struct in6_addr));
375                         if (rv == 0)
376                                 break;
377                 }
378                 if (rv)         /* source not found */
379                         goto done;      /* err = -EADDRNOTAVAIL */
380
381                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
382                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
383                         leavegroup = 1;
384                         goto done;
385                 }
386
387                 /* update the interface filter */
388                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
389
390                 for (j=i+1; j<psl->sl_count; j++)
391                         psl->sl_addr[j-1] = psl->sl_addr[j];
392                 psl->sl_count--;
393                 err = 0;
394                 goto done;
395         }
396         /* else, add a new source to the filter */
397
398         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
399                 err = -ENOBUFS;
400                 goto done;
401         }
402         if (!psl || psl->sl_count == psl->sl_max) {
403                 struct ip6_sf_socklist *newpsl;
404                 int count = IP6_SFBLOCK;
405
406                 if (psl)
407                         count += psl->sl_max;
408                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
409                 if (!newpsl) {
410                         err = -ENOBUFS;
411                         goto done;
412                 }
413                 newpsl->sl_max = count;
414                 newpsl->sl_count = count - IP6_SFBLOCK;
415                 if (psl) {
416                         for (i=0; i<psl->sl_count; i++)
417                                 newpsl->sl_addr[i] = psl->sl_addr[i];
418                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
419                 }
420                 pmc->sflist = psl = newpsl;
421         }
422         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
423         for (i=0; i<psl->sl_count; i++) {
424                 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
425                 if (rv == 0)
426                         break;
427         }
428         if (rv == 0)            /* address already there is an error */
429                 goto done;
430         for (j=psl->sl_count-1; j>=i; j--)
431                 psl->sl_addr[j+1] = psl->sl_addr[j];
432         psl->sl_addr[i] = *source;
433         psl->sl_count++;
434         err = 0;
435         /* update the interface list */
436         ip6_mc_add_src(idev, group, omode, 1, source, 1);
437 done:
438         if (pmclocked)
439                 write_unlock(&pmc->sflock);
440         read_unlock_bh(&idev->lock);
441         rcu_read_unlock();
442         if (leavegroup)
443                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
444         return err;
445 }
446
447 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
448 {
449         const struct in6_addr *group;
450         struct ipv6_mc_socklist *pmc;
451         struct inet6_dev *idev;
452         struct ipv6_pinfo *inet6 = inet6_sk(sk);
453         struct ip6_sf_socklist *newpsl, *psl;
454         struct net *net = sock_net(sk);
455         int leavegroup = 0;
456         int i, err;
457
458         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
459
460         if (!ipv6_addr_is_multicast(group))
461                 return -EINVAL;
462         if (gsf->gf_fmode != MCAST_INCLUDE &&
463             gsf->gf_fmode != MCAST_EXCLUDE)
464                 return -EINVAL;
465
466         rcu_read_lock();
467         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
468
469         if (!idev) {
470                 rcu_read_unlock();
471                 return -ENODEV;
472         }
473
474         err = 0;
475
476         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
477                 leavegroup = 1;
478                 goto done;
479         }
480
481         for_each_pmc_rcu(inet6, pmc) {
482                 if (pmc->ifindex != gsf->gf_interface)
483                         continue;
484                 if (ipv6_addr_equal(&pmc->addr, group))
485                         break;
486         }
487         if (!pmc) {             /* must have a prior join */
488                 err = -EINVAL;
489                 goto done;
490         }
491         if (gsf->gf_numsrc) {
492                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
493                                                           GFP_ATOMIC);
494                 if (!newpsl) {
495                         err = -ENOBUFS;
496                         goto done;
497                 }
498                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
499                 for (i=0; i<newpsl->sl_count; ++i) {
500                         struct sockaddr_in6 *psin6;
501
502                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
503                         newpsl->sl_addr[i] = psin6->sin6_addr;
504                 }
505                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
506                         newpsl->sl_count, newpsl->sl_addr, 0);
507                 if (err) {
508                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
509                         goto done;
510                 }
511         } else {
512                 newpsl = NULL;
513                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
514         }
515
516         write_lock(&pmc->sflock);
517         psl = pmc->sflist;
518         if (psl) {
519                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
520                         psl->sl_count, psl->sl_addr, 0);
521                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
522         } else
523                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
524         pmc->sflist = newpsl;
525         pmc->sfmode = gsf->gf_fmode;
526         write_unlock(&pmc->sflock);
527         err = 0;
528 done:
529         read_unlock_bh(&idev->lock);
530         rcu_read_unlock();
531         if (leavegroup)
532                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
533         return err;
534 }
535
536 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
537         struct group_filter __user *optval, int __user *optlen)
538 {
539         int err, i, count, copycount;
540         const struct in6_addr *group;
541         struct ipv6_mc_socklist *pmc;
542         struct inet6_dev *idev;
543         struct ipv6_pinfo *inet6 = inet6_sk(sk);
544         struct ip6_sf_socklist *psl;
545         struct net *net = sock_net(sk);
546
547         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
548
549         if (!ipv6_addr_is_multicast(group))
550                 return -EINVAL;
551
552         rcu_read_lock();
553         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
554
555         if (!idev) {
556                 rcu_read_unlock();
557                 return -ENODEV;
558         }
559
560         err = -EADDRNOTAVAIL;
561         /*
562          * changes to the ipv6_mc_list require the socket lock and
563          * a read lock on ip6_sk_mc_lock. We have the socket lock,
564          * so reading the list is safe.
565          */
566
567         for_each_pmc_rcu(inet6, pmc) {
568                 if (pmc->ifindex != gsf->gf_interface)
569                         continue;
570                 if (ipv6_addr_equal(group, &pmc->addr))
571                         break;
572         }
573         if (!pmc)               /* must have a prior join */
574                 goto done;
575         gsf->gf_fmode = pmc->sfmode;
576         psl = pmc->sflist;
577         count = psl ? psl->sl_count : 0;
578         read_unlock_bh(&idev->lock);
579         rcu_read_unlock();
580
581         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
582         gsf->gf_numsrc = count;
583         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
584             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
585                 return -EFAULT;
586         }
587         /* changes to psl require the socket lock, a read lock on
588          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
589          * have the socket lock, so reading here is safe.
590          */
591         for (i=0; i<copycount; i++) {
592                 struct sockaddr_in6 *psin6;
593                 struct sockaddr_storage ss;
594
595                 psin6 = (struct sockaddr_in6 *)&ss;
596                 memset(&ss, 0, sizeof(ss));
597                 psin6->sin6_family = AF_INET6;
598                 psin6->sin6_addr = psl->sl_addr[i];
599                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
600                         return -EFAULT;
601         }
602         return 0;
603 done:
604         read_unlock_bh(&idev->lock);
605         rcu_read_unlock();
606         return err;
607 }
608
609 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
610                    const struct in6_addr *src_addr)
611 {
612         struct ipv6_pinfo *np = inet6_sk(sk);
613         struct ipv6_mc_socklist *mc;
614         struct ip6_sf_socklist *psl;
615         int rv = 1;
616
617         rcu_read_lock();
618         for_each_pmc_rcu(np, mc) {
619                 if (ipv6_addr_equal(&mc->addr, mc_addr))
620                         break;
621         }
622         if (!mc) {
623                 rcu_read_unlock();
624                 return 1;
625         }
626         read_lock(&mc->sflock);
627         psl = mc->sflist;
628         if (!psl) {
629                 rv = mc->sfmode == MCAST_EXCLUDE;
630         } else {
631                 int i;
632
633                 for (i=0; i<psl->sl_count; i++) {
634                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
635                                 break;
636                 }
637                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
638                         rv = 0;
639                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
640                         rv = 0;
641         }
642         read_unlock(&mc->sflock);
643         rcu_read_unlock();
644
645         return rv;
646 }
647
648 static void ma_put(struct ifmcaddr6 *mc)
649 {
650         if (atomic_dec_and_test(&mc->mca_refcnt)) {
651                 in6_dev_put(mc->idev);
652                 kfree(mc);
653         }
654 }
655
656 static void igmp6_group_added(struct ifmcaddr6 *mc)
657 {
658         struct net_device *dev = mc->idev->dev;
659         char buf[MAX_ADDR_LEN];
660
661         spin_lock_bh(&mc->mca_lock);
662         if (!(mc->mca_flags&MAF_LOADED)) {
663                 mc->mca_flags |= MAF_LOADED;
664                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
665                         dev_mc_add(dev, buf);
666         }
667         spin_unlock_bh(&mc->mca_lock);
668
669         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
670                 return;
671
672         if (MLD_V1_SEEN(mc->idev)) {
673                 igmp6_join_group(mc);
674                 return;
675         }
676         /* else v2 */
677
678         mc->mca_crcount = mc->idev->mc_qrv;
679         mld_ifc_event(mc->idev);
680 }
681
682 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
683 {
684         struct net_device *dev = mc->idev->dev;
685         char buf[MAX_ADDR_LEN];
686
687         spin_lock_bh(&mc->mca_lock);
688         if (mc->mca_flags&MAF_LOADED) {
689                 mc->mca_flags &= ~MAF_LOADED;
690                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
691                         dev_mc_del(dev, buf);
692         }
693
694         if (mc->mca_flags & MAF_NOREPORT)
695                 goto done;
696         spin_unlock_bh(&mc->mca_lock);
697
698         if (!mc->idev->dead)
699                 igmp6_leave_group(mc);
700
701         spin_lock_bh(&mc->mca_lock);
702         if (del_timer(&mc->mca_timer))
703                 atomic_dec(&mc->mca_refcnt);
704 done:
705         ip6_mc_clear_src(mc);
706         spin_unlock_bh(&mc->mca_lock);
707 }
708
709 /*
710  * deleted ifmcaddr6 manipulation
711  */
712 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
713 {
714         struct ifmcaddr6 *pmc;
715
716         /* this is an "ifmcaddr6" for convenience; only the fields below
717          * are actually used. In particular, the refcnt and users are not
718          * used for management of the delete list. Using the same structure
719          * for deleted items allows change reports to use common code with
720          * non-deleted or query-response MCA's.
721          */
722         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
723         if (!pmc)
724                 return;
725
726         spin_lock_bh(&im->mca_lock);
727         spin_lock_init(&pmc->mca_lock);
728         pmc->idev = im->idev;
729         in6_dev_hold(idev);
730         pmc->mca_addr = im->mca_addr;
731         pmc->mca_crcount = idev->mc_qrv;
732         pmc->mca_sfmode = im->mca_sfmode;
733         if (pmc->mca_sfmode == MCAST_INCLUDE) {
734                 struct ip6_sf_list *psf;
735
736                 pmc->mca_tomb = im->mca_tomb;
737                 pmc->mca_sources = im->mca_sources;
738                 im->mca_tomb = im->mca_sources = NULL;
739                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
740                         psf->sf_crcount = pmc->mca_crcount;
741         }
742         spin_unlock_bh(&im->mca_lock);
743
744         spin_lock_bh(&idev->mc_lock);
745         pmc->next = idev->mc_tomb;
746         idev->mc_tomb = pmc;
747         spin_unlock_bh(&idev->mc_lock);
748 }
749
750 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
751 {
752         struct ifmcaddr6 *pmc, *pmc_prev;
753         struct ip6_sf_list *psf, *psf_next;
754
755         spin_lock_bh(&idev->mc_lock);
756         pmc_prev = NULL;
757         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
758                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
759                         break;
760                 pmc_prev = pmc;
761         }
762         if (pmc) {
763                 if (pmc_prev)
764                         pmc_prev->next = pmc->next;
765                 else
766                         idev->mc_tomb = pmc->next;
767         }
768         spin_unlock_bh(&idev->mc_lock);
769
770         if (pmc) {
771                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
772                         psf_next = psf->sf_next;
773                         kfree(psf);
774                 }
775                 in6_dev_put(pmc->idev);
776                 kfree(pmc);
777         }
778 }
779
780 static void mld_clear_delrec(struct inet6_dev *idev)
781 {
782         struct ifmcaddr6 *pmc, *nextpmc;
783
784         spin_lock_bh(&idev->mc_lock);
785         pmc = idev->mc_tomb;
786         idev->mc_tomb = NULL;
787         spin_unlock_bh(&idev->mc_lock);
788
789         for (; pmc; pmc = nextpmc) {
790                 nextpmc = pmc->next;
791                 ip6_mc_clear_src(pmc);
792                 in6_dev_put(pmc->idev);
793                 kfree(pmc);
794         }
795
796         /* clear dead sources, too */
797         read_lock_bh(&idev->lock);
798         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
799                 struct ip6_sf_list *psf, *psf_next;
800
801                 spin_lock_bh(&pmc->mca_lock);
802                 psf = pmc->mca_tomb;
803                 pmc->mca_tomb = NULL;
804                 spin_unlock_bh(&pmc->mca_lock);
805                 for (; psf; psf=psf_next) {
806                         psf_next = psf->sf_next;
807                         kfree(psf);
808                 }
809         }
810         read_unlock_bh(&idev->lock);
811 }
812
813
814 /*
815  *      device multicast group inc (add if not found)
816  */
817 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
818 {
819         struct ifmcaddr6 *mc;
820         struct inet6_dev *idev;
821
822         /* we need to take a reference on idev */
823         idev = in6_dev_get(dev);
824
825         if (idev == NULL)
826                 return -EINVAL;
827
828         write_lock_bh(&idev->lock);
829         if (idev->dead) {
830                 write_unlock_bh(&idev->lock);
831                 in6_dev_put(idev);
832                 return -ENODEV;
833         }
834
835         for (mc = idev->mc_list; mc; mc = mc->next) {
836                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
837                         mc->mca_users++;
838                         write_unlock_bh(&idev->lock);
839                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
840                                 NULL, 0);
841                         in6_dev_put(idev);
842                         return 0;
843                 }
844         }
845
846         /*
847          *      not found: create a new one.
848          */
849
850         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
851
852         if (mc == NULL) {
853                 write_unlock_bh(&idev->lock);
854                 in6_dev_put(idev);
855                 return -ENOMEM;
856         }
857
858         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
859
860         ipv6_addr_copy(&mc->mca_addr, addr);
861         mc->idev = idev; /* (reference taken) */
862         mc->mca_users = 1;
863         /* mca_stamp should be updated upon changes */
864         mc->mca_cstamp = mc->mca_tstamp = jiffies;
865         atomic_set(&mc->mca_refcnt, 2);
866         spin_lock_init(&mc->mca_lock);
867
868         /* initial mode is (EX, empty) */
869         mc->mca_sfmode = MCAST_EXCLUDE;
870         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
871
872         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
873             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
874                 mc->mca_flags |= MAF_NOREPORT;
875
876         mc->next = idev->mc_list;
877         idev->mc_list = mc;
878         write_unlock_bh(&idev->lock);
879
880         mld_del_delrec(idev, &mc->mca_addr);
881         igmp6_group_added(mc);
882         ma_put(mc);
883         return 0;
884 }
885
886 /*
887  *      device multicast group del
888  */
889 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
890 {
891         struct ifmcaddr6 *ma, **map;
892
893         write_lock_bh(&idev->lock);
894         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
895                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
896                         if (--ma->mca_users == 0) {
897                                 *map = ma->next;
898                                 write_unlock_bh(&idev->lock);
899
900                                 igmp6_group_dropped(ma);
901
902                                 ma_put(ma);
903                                 return 0;
904                         }
905                         write_unlock_bh(&idev->lock);
906                         return 0;
907                 }
908         }
909         write_unlock_bh(&idev->lock);
910
911         return -ENOENT;
912 }
913
914 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
915 {
916         struct inet6_dev *idev;
917         int err;
918
919         rcu_read_lock();
920
921         idev = __in6_dev_get(dev);
922         if (!idev)
923                 err = -ENODEV;
924         else
925                 err = __ipv6_dev_mc_dec(idev, addr);
926
927         rcu_read_unlock();
928         return err;
929 }
930
931 /*
932  * identify MLD packets for MLD filter exceptions
933  */
934 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
935 {
936         struct icmp6hdr *pic;
937
938         if (nexthdr != IPPROTO_ICMPV6)
939                 return 0;
940
941         if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
942                 return 0;
943
944         pic = icmp6_hdr(skb);
945
946         switch (pic->icmp6_type) {
947         case ICMPV6_MGM_QUERY:
948         case ICMPV6_MGM_REPORT:
949         case ICMPV6_MGM_REDUCTION:
950         case ICMPV6_MLD2_REPORT:
951                 return 1;
952         default:
953                 break;
954         }
955         return 0;
956 }
957
958 /*
959  *      check if the interface/address pair is valid
960  */
961 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
962                         const struct in6_addr *src_addr)
963 {
964         struct inet6_dev *idev;
965         struct ifmcaddr6 *mc;
966         int rv = 0;
967
968         rcu_read_lock();
969         idev = __in6_dev_get(dev);
970         if (idev) {
971                 read_lock_bh(&idev->lock);
972                 for (mc = idev->mc_list; mc; mc=mc->next) {
973                         if (ipv6_addr_equal(&mc->mca_addr, group))
974                                 break;
975                 }
976                 if (mc) {
977                         if (src_addr && !ipv6_addr_any(src_addr)) {
978                                 struct ip6_sf_list *psf;
979
980                                 spin_lock_bh(&mc->mca_lock);
981                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
982                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
983                                                 break;
984                                 }
985                                 if (psf)
986                                         rv = psf->sf_count[MCAST_INCLUDE] ||
987                                                 psf->sf_count[MCAST_EXCLUDE] !=
988                                                 mc->mca_sfcount[MCAST_EXCLUDE];
989                                 else
990                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
991                                 spin_unlock_bh(&mc->mca_lock);
992                         } else
993                                 rv = 1; /* don't filter unspecified source */
994                 }
995                 read_unlock_bh(&idev->lock);
996         }
997         rcu_read_unlock();
998         return rv;
999 }
1000
1001 static void mld_gq_start_timer(struct inet6_dev *idev)
1002 {
1003         int tv = net_random() % idev->mc_maxdelay;
1004
1005         idev->mc_gq_running = 1;
1006         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1007                 in6_dev_hold(idev);
1008 }
1009
1010 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1011 {
1012         int tv = net_random() % delay;
1013
1014         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1015                 in6_dev_hold(idev);
1016 }
1017
1018 /*
1019  *      IGMP handling (alias multicast ICMPv6 messages)
1020  */
1021
1022 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1023 {
1024         unsigned long delay = resptime;
1025
1026         /* Do not start timer for these addresses */
1027         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1028             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1029                 return;
1030
1031         if (del_timer(&ma->mca_timer)) {
1032                 atomic_dec(&ma->mca_refcnt);
1033                 delay = ma->mca_timer.expires - jiffies;
1034         }
1035
1036         if (delay >= resptime) {
1037                 if (resptime)
1038                         delay = net_random() % resptime;
1039                 else
1040                         delay = 1;
1041         }
1042         ma->mca_timer.expires = jiffies + delay;
1043         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1044                 atomic_inc(&ma->mca_refcnt);
1045         ma->mca_flags |= MAF_TIMER_RUNNING;
1046 }
1047
1048 /* mark EXCLUDE-mode sources */
1049 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1050         const struct in6_addr *srcs)
1051 {
1052         struct ip6_sf_list *psf;
1053         int i, scount;
1054
1055         scount = 0;
1056         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1057                 if (scount == nsrcs)
1058                         break;
1059                 for (i=0; i<nsrcs; i++) {
1060                         /* skip inactive filters */
1061                         if (psf->sf_count[MCAST_INCLUDE] ||
1062                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1063                             psf->sf_count[MCAST_EXCLUDE])
1064                                 continue;
1065                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1066                                 scount++;
1067                                 break;
1068                         }
1069                 }
1070         }
1071         pmc->mca_flags &= ~MAF_GSQUERY;
1072         if (scount == nsrcs)    /* all sources excluded */
1073                 return 0;
1074         return 1;
1075 }
1076
1077 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1078         const struct in6_addr *srcs)
1079 {
1080         struct ip6_sf_list *psf;
1081         int i, scount;
1082
1083         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1084                 return mld_xmarksources(pmc, nsrcs, srcs);
1085
1086         /* mark INCLUDE-mode sources */
1087
1088         scount = 0;
1089         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1090                 if (scount == nsrcs)
1091                         break;
1092                 for (i=0; i<nsrcs; i++) {
1093                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1094                                 psf->sf_gsresp = 1;
1095                                 scount++;
1096                                 break;
1097                         }
1098                 }
1099         }
1100         if (!scount) {
1101                 pmc->mca_flags &= ~MAF_GSQUERY;
1102                 return 0;
1103         }
1104         pmc->mca_flags |= MAF_GSQUERY;
1105         return 1;
1106 }
1107
1108 /* called with rcu_read_lock() */
1109 int igmp6_event_query(struct sk_buff *skb)
1110 {
1111         struct mld2_query *mlh2 = NULL;
1112         struct ifmcaddr6 *ma;
1113         const struct in6_addr *group;
1114         unsigned long max_delay;
1115         struct inet6_dev *idev;
1116         struct mld_msg *mld;
1117         int group_type;
1118         int mark = 0;
1119         int len;
1120
1121         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1122                 return -EINVAL;
1123
1124         /* compute payload length excluding extension headers */
1125         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1126         len -= skb_network_header_len(skb);
1127
1128         /* Drop queries with not link local source */
1129         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1130                 return -EINVAL;
1131
1132         idev = __in6_dev_get(skb->dev);
1133
1134         if (idev == NULL)
1135                 return 0;
1136
1137         mld = (struct mld_msg *)icmp6_hdr(skb);
1138         group = &mld->mld_mca;
1139         group_type = ipv6_addr_type(group);
1140
1141         if (group_type != IPV6_ADDR_ANY &&
1142             !(group_type&IPV6_ADDR_MULTICAST))
1143                 return -EINVAL;
1144
1145         if (len == 24) {
1146                 int switchback;
1147                 /* MLDv1 router present */
1148
1149                 /* Translate milliseconds to jiffies */
1150                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1151
1152                 switchback = (idev->mc_qrv + 1) * max_delay;
1153                 idev->mc_v1_seen = jiffies + switchback;
1154
1155                 /* cancel the interface change timer */
1156                 idev->mc_ifc_count = 0;
1157                 if (del_timer(&idev->mc_ifc_timer))
1158                         __in6_dev_put(idev);
1159                 /* clear deleted report items */
1160                 mld_clear_delrec(idev);
1161         } else if (len >= 28) {
1162                 int srcs_offset = sizeof(struct mld2_query) -
1163                                   sizeof(struct icmp6hdr);
1164                 if (!pskb_may_pull(skb, srcs_offset))
1165                         return -EINVAL;
1166
1167                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1168                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1169                 if (!max_delay)
1170                         max_delay = 1;
1171                 idev->mc_maxdelay = max_delay;
1172                 if (mlh2->mld2q_qrv)
1173                         idev->mc_qrv = mlh2->mld2q_qrv;
1174                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1175                         if (mlh2->mld2q_nsrcs)
1176                                 return -EINVAL; /* no sources allowed */
1177
1178                         mld_gq_start_timer(idev);
1179                         return 0;
1180                 }
1181                 /* mark sources to include, if group & source-specific */
1182                 if (mlh2->mld2q_nsrcs != 0) {
1183                         if (!pskb_may_pull(skb, srcs_offset +
1184                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1185                                 return -EINVAL;
1186
1187                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1188                         mark = 1;
1189                 }
1190         } else
1191                 return -EINVAL;
1192
1193         read_lock_bh(&idev->lock);
1194         if (group_type == IPV6_ADDR_ANY) {
1195                 for (ma = idev->mc_list; ma; ma=ma->next) {
1196                         spin_lock_bh(&ma->mca_lock);
1197                         igmp6_group_queried(ma, max_delay);
1198                         spin_unlock_bh(&ma->mca_lock);
1199                 }
1200         } else {
1201                 for (ma = idev->mc_list; ma; ma=ma->next) {
1202                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1203                                 continue;
1204                         spin_lock_bh(&ma->mca_lock);
1205                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1206                                 /* gsquery <- gsquery && mark */
1207                                 if (!mark)
1208                                         ma->mca_flags &= ~MAF_GSQUERY;
1209                         } else {
1210                                 /* gsquery <- mark */
1211                                 if (mark)
1212                                         ma->mca_flags |= MAF_GSQUERY;
1213                                 else
1214                                         ma->mca_flags &= ~MAF_GSQUERY;
1215                         }
1216                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1217                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1218                                 igmp6_group_queried(ma, max_delay);
1219                         spin_unlock_bh(&ma->mca_lock);
1220                         break;
1221                 }
1222         }
1223         read_unlock_bh(&idev->lock);
1224
1225         return 0;
1226 }
1227
1228 /* called with rcu_read_lock() */
1229 int igmp6_event_report(struct sk_buff *skb)
1230 {
1231         struct ifmcaddr6 *ma;
1232         struct inet6_dev *idev;
1233         struct mld_msg *mld;
1234         int addr_type;
1235
1236         /* Our own report looped back. Ignore it. */
1237         if (skb->pkt_type == PACKET_LOOPBACK)
1238                 return 0;
1239
1240         /* send our report if the MC router may not have heard this report */
1241         if (skb->pkt_type != PACKET_MULTICAST &&
1242             skb->pkt_type != PACKET_BROADCAST)
1243                 return 0;
1244
1245         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1246                 return -EINVAL;
1247
1248         mld = (struct mld_msg *)icmp6_hdr(skb);
1249
1250         /* Drop reports with not link local source */
1251         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1252         if (addr_type != IPV6_ADDR_ANY &&
1253             !(addr_type&IPV6_ADDR_LINKLOCAL))
1254                 return -EINVAL;
1255
1256         idev = __in6_dev_get(skb->dev);
1257         if (idev == NULL)
1258                 return -ENODEV;
1259
1260         /*
1261          *      Cancel the timer for this group
1262          */
1263
1264         read_lock_bh(&idev->lock);
1265         for (ma = idev->mc_list; ma; ma=ma->next) {
1266                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1267                         spin_lock(&ma->mca_lock);
1268                         if (del_timer(&ma->mca_timer))
1269                                 atomic_dec(&ma->mca_refcnt);
1270                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1271                         spin_unlock(&ma->mca_lock);
1272                         break;
1273                 }
1274         }
1275         read_unlock_bh(&idev->lock);
1276         return 0;
1277 }
1278
1279 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1280         int gdeleted, int sdeleted)
1281 {
1282         switch (type) {
1283         case MLD2_MODE_IS_INCLUDE:
1284         case MLD2_MODE_IS_EXCLUDE:
1285                 if (gdeleted || sdeleted)
1286                         return 0;
1287                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1288                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1289                                 return 1;
1290                         /* don't include if this source is excluded
1291                          * in all filters
1292                          */
1293                         if (psf->sf_count[MCAST_INCLUDE])
1294                                 return type == MLD2_MODE_IS_INCLUDE;
1295                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1296                                 psf->sf_count[MCAST_EXCLUDE];
1297                 }
1298                 return 0;
1299         case MLD2_CHANGE_TO_INCLUDE:
1300                 if (gdeleted || sdeleted)
1301                         return 0;
1302                 return psf->sf_count[MCAST_INCLUDE] != 0;
1303         case MLD2_CHANGE_TO_EXCLUDE:
1304                 if (gdeleted || sdeleted)
1305                         return 0;
1306                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1307                     psf->sf_count[MCAST_INCLUDE])
1308                         return 0;
1309                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1310                         psf->sf_count[MCAST_EXCLUDE];
1311         case MLD2_ALLOW_NEW_SOURCES:
1312                 if (gdeleted || !psf->sf_crcount)
1313                         return 0;
1314                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1315         case MLD2_BLOCK_OLD_SOURCES:
1316                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1317                         return gdeleted || (psf->sf_crcount && sdeleted);
1318                 return psf->sf_crcount && !gdeleted && !sdeleted;
1319         }
1320         return 0;
1321 }
1322
1323 static int
1324 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1325 {
1326         struct ip6_sf_list *psf;
1327         int scount = 0;
1328
1329         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1330                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1331                         continue;
1332                 scount++;
1333         }
1334         return scount;
1335 }
1336
1337 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1338 {
1339         struct net_device *dev = idev->dev;
1340         struct net *net = dev_net(dev);
1341         struct sock *sk = net->ipv6.igmp_sk;
1342         struct sk_buff *skb;
1343         struct mld2_report *pmr;
1344         struct in6_addr addr_buf;
1345         const struct in6_addr *saddr;
1346         int err;
1347         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1348                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1349                      IPV6_TLV_PADN, 0 };
1350
1351         /* we assume size > sizeof(ra) here */
1352         size += LL_ALLOCATED_SPACE(dev);
1353         /* limit our allocations to order-0 page */
1354         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1355         skb = sock_alloc_send_skb(sk, size, 1, &err);
1356
1357         if (!skb)
1358                 return NULL;
1359
1360         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1361
1362         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1363                 /* <draft-ietf-magma-mld-source-05.txt>:
1364                  * use unspecified address as the source address
1365                  * when a valid link-local address is not available.
1366                  */
1367                 saddr = &in6addr_any;
1368         } else
1369                 saddr = &addr_buf;
1370
1371         ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1372
1373         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1374
1375         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1376         skb_put(skb, sizeof(*pmr));
1377         pmr = (struct mld2_report *)skb_transport_header(skb);
1378         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1379         pmr->mld2r_resv1 = 0;
1380         pmr->mld2r_cksum = 0;
1381         pmr->mld2r_resv2 = 0;
1382         pmr->mld2r_ngrec = 0;
1383         return skb;
1384 }
1385
1386 static void mld_sendpack(struct sk_buff *skb)
1387 {
1388         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1389         struct mld2_report *pmr =
1390                               (struct mld2_report *)skb_transport_header(skb);
1391         int payload_len, mldlen;
1392         struct inet6_dev *idev;
1393         struct net *net = dev_net(skb->dev);
1394         int err;
1395         struct flowi6 fl6;
1396         struct dst_entry *dst;
1397
1398         rcu_read_lock();
1399         idev = __in6_dev_get(skb->dev);
1400         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1401
1402         payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1403         mldlen = skb->tail - skb->transport_header;
1404         pip6->payload_len = htons(payload_len);
1405
1406         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1407                                            IPPROTO_ICMPV6,
1408                                            csum_partial(skb_transport_header(skb),
1409                                                         mldlen, 0));
1410
1411         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1412
1413         if (!dst) {
1414                 err = -ENOMEM;
1415                 goto err_out;
1416         }
1417
1418         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1419                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1420                          skb->dev->ifindex);
1421
1422         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1423         err = 0;
1424         if (IS_ERR(dst)) {
1425                 err = PTR_ERR(dst);
1426                 dst = NULL;
1427         }
1428         skb_dst_set(skb, dst);
1429         if (err)
1430                 goto err_out;
1431
1432         payload_len = skb->len;
1433
1434         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1435                       dst_output);
1436 out:
1437         if (!err) {
1438                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1439                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1440                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1441         } else {
1442                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1443         }
1444
1445         rcu_read_unlock();
1446         return;
1447
1448 err_out:
1449         kfree_skb(skb);
1450         goto out;
1451 }
1452
1453 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1454 {
1455         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1456 }
1457
1458 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1459         int type, struct mld2_grec **ppgr)
1460 {
1461         struct net_device *dev = pmc->idev->dev;
1462         struct mld2_report *pmr;
1463         struct mld2_grec *pgr;
1464
1465         if (!skb)
1466                 skb = mld_newpack(pmc->idev, dev->mtu);
1467         if (!skb)
1468                 return NULL;
1469         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1470         pgr->grec_type = type;
1471         pgr->grec_auxwords = 0;
1472         pgr->grec_nsrcs = 0;
1473         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1474         pmr = (struct mld2_report *)skb_transport_header(skb);
1475         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1476         *ppgr = pgr;
1477         return skb;
1478 }
1479
1480 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1481         skb_tailroom(skb)) : 0)
1482
1483 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1484         int type, int gdeleted, int sdeleted)
1485 {
1486         struct inet6_dev *idev = pmc->idev;
1487         struct net_device *dev = idev->dev;
1488         struct mld2_report *pmr;
1489         struct mld2_grec *pgr = NULL;
1490         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1491         int scount, stotal, first, isquery, truncate;
1492
1493         if (pmc->mca_flags & MAF_NOREPORT)
1494                 return skb;
1495
1496         isquery = type == MLD2_MODE_IS_INCLUDE ||
1497                   type == MLD2_MODE_IS_EXCLUDE;
1498         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1499                     type == MLD2_CHANGE_TO_EXCLUDE;
1500
1501         stotal = scount = 0;
1502
1503         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1504
1505         if (!*psf_list)
1506                 goto empty_source;
1507
1508         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1509
1510         /* EX and TO_EX get a fresh packet, if needed */
1511         if (truncate) {
1512                 if (pmr && pmr->mld2r_ngrec &&
1513                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1514                         if (skb)
1515                                 mld_sendpack(skb);
1516                         skb = mld_newpack(idev, dev->mtu);
1517                 }
1518         }
1519         first = 1;
1520         psf_prev = NULL;
1521         for (psf=*psf_list; psf; psf=psf_next) {
1522                 struct in6_addr *psrc;
1523
1524                 psf_next = psf->sf_next;
1525
1526                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1527                         psf_prev = psf;
1528                         continue;
1529                 }
1530
1531                 /* clear marks on query responses */
1532                 if (isquery)
1533                         psf->sf_gsresp = 0;
1534
1535                 if (AVAILABLE(skb) < sizeof(*psrc) +
1536                     first*sizeof(struct mld2_grec)) {
1537                         if (truncate && !first)
1538                                 break;   /* truncate these */
1539                         if (pgr)
1540                                 pgr->grec_nsrcs = htons(scount);
1541                         if (skb)
1542                                 mld_sendpack(skb);
1543                         skb = mld_newpack(idev, dev->mtu);
1544                         first = 1;
1545                         scount = 0;
1546                 }
1547                 if (first) {
1548                         skb = add_grhead(skb, pmc, type, &pgr);
1549                         first = 0;
1550                 }
1551                 if (!skb)
1552                         return NULL;
1553                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1554                 *psrc = psf->sf_addr;
1555                 scount++; stotal++;
1556                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1557                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1558                         psf->sf_crcount--;
1559                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1560                                 if (psf_prev)
1561                                         psf_prev->sf_next = psf->sf_next;
1562                                 else
1563                                         *psf_list = psf->sf_next;
1564                                 kfree(psf);
1565                                 continue;
1566                         }
1567                 }
1568                 psf_prev = psf;
1569         }
1570
1571 empty_source:
1572         if (!stotal) {
1573                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1574                     type == MLD2_BLOCK_OLD_SOURCES)
1575                         return skb;
1576                 if (pmc->mca_crcount || isquery) {
1577                         /* make sure we have room for group header */
1578                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1579                                 mld_sendpack(skb);
1580                                 skb = NULL; /* add_grhead will get a new one */
1581                         }
1582                         skb = add_grhead(skb, pmc, type, &pgr);
1583                 }
1584         }
1585         if (pgr)
1586                 pgr->grec_nsrcs = htons(scount);
1587
1588         if (isquery)
1589                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1590         return skb;
1591 }
1592
1593 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1594 {
1595         struct sk_buff *skb = NULL;
1596         int type;
1597
1598         read_lock_bh(&idev->lock);
1599         if (!pmc) {
1600                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1601                         if (pmc->mca_flags & MAF_NOREPORT)
1602                                 continue;
1603                         spin_lock_bh(&pmc->mca_lock);
1604                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1605                                 type = MLD2_MODE_IS_EXCLUDE;
1606                         else
1607                                 type = MLD2_MODE_IS_INCLUDE;
1608                         skb = add_grec(skb, pmc, type, 0, 0);
1609                         spin_unlock_bh(&pmc->mca_lock);
1610                 }
1611         } else {
1612                 spin_lock_bh(&pmc->mca_lock);
1613                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1614                         type = MLD2_MODE_IS_EXCLUDE;
1615                 else
1616                         type = MLD2_MODE_IS_INCLUDE;
1617                 skb = add_grec(skb, pmc, type, 0, 0);
1618                 spin_unlock_bh(&pmc->mca_lock);
1619         }
1620         read_unlock_bh(&idev->lock);
1621         if (skb)
1622                 mld_sendpack(skb);
1623 }
1624
1625 /*
1626  * remove zero-count source records from a source filter list
1627  */
1628 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1629 {
1630         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1631
1632         psf_prev = NULL;
1633         for (psf=*ppsf; psf; psf = psf_next) {
1634                 psf_next = psf->sf_next;
1635                 if (psf->sf_crcount == 0) {
1636                         if (psf_prev)
1637                                 psf_prev->sf_next = psf->sf_next;
1638                         else
1639                                 *ppsf = psf->sf_next;
1640                         kfree(psf);
1641                 } else
1642                         psf_prev = psf;
1643         }
1644 }
1645
1646 static void mld_send_cr(struct inet6_dev *idev)
1647 {
1648         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1649         struct sk_buff *skb = NULL;
1650         int type, dtype;
1651
1652         read_lock_bh(&idev->lock);
1653         spin_lock(&idev->mc_lock);
1654
1655         /* deleted MCA's */
1656         pmc_prev = NULL;
1657         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1658                 pmc_next = pmc->next;
1659                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1660                         type = MLD2_BLOCK_OLD_SOURCES;
1661                         dtype = MLD2_BLOCK_OLD_SOURCES;
1662                         skb = add_grec(skb, pmc, type, 1, 0);
1663                         skb = add_grec(skb, pmc, dtype, 1, 1);
1664                 }
1665                 if (pmc->mca_crcount) {
1666                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1667                                 type = MLD2_CHANGE_TO_INCLUDE;
1668                                 skb = add_grec(skb, pmc, type, 1, 0);
1669                         }
1670                         pmc->mca_crcount--;
1671                         if (pmc->mca_crcount == 0) {
1672                                 mld_clear_zeros(&pmc->mca_tomb);
1673                                 mld_clear_zeros(&pmc->mca_sources);
1674                         }
1675                 }
1676                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1677                     !pmc->mca_sources) {
1678                         if (pmc_prev)
1679                                 pmc_prev->next = pmc_next;
1680                         else
1681                                 idev->mc_tomb = pmc_next;
1682                         in6_dev_put(pmc->idev);
1683                         kfree(pmc);
1684                 } else
1685                         pmc_prev = pmc;
1686         }
1687         spin_unlock(&idev->mc_lock);
1688
1689         /* change recs */
1690         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1691                 spin_lock_bh(&pmc->mca_lock);
1692                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1693                         type = MLD2_BLOCK_OLD_SOURCES;
1694                         dtype = MLD2_ALLOW_NEW_SOURCES;
1695                 } else {
1696                         type = MLD2_ALLOW_NEW_SOURCES;
1697                         dtype = MLD2_BLOCK_OLD_SOURCES;
1698                 }
1699                 skb = add_grec(skb, pmc, type, 0, 0);
1700                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1701
1702                 /* filter mode changes */
1703                 if (pmc->mca_crcount) {
1704                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1705                                 type = MLD2_CHANGE_TO_EXCLUDE;
1706                         else
1707                                 type = MLD2_CHANGE_TO_INCLUDE;
1708                         skb = add_grec(skb, pmc, type, 0, 0);
1709                         pmc->mca_crcount--;
1710                 }
1711                 spin_unlock_bh(&pmc->mca_lock);
1712         }
1713         read_unlock_bh(&idev->lock);
1714         if (!skb)
1715                 return;
1716         (void) mld_sendpack(skb);
1717 }
1718
1719 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1720 {
1721         struct net *net = dev_net(dev);
1722         struct sock *sk = net->ipv6.igmp_sk;
1723         struct inet6_dev *idev;
1724         struct sk_buff *skb;
1725         struct mld_msg *hdr;
1726         const struct in6_addr *snd_addr, *saddr;
1727         struct in6_addr addr_buf;
1728         int err, len, payload_len, full_len;
1729         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1730                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1731                      IPV6_TLV_PADN, 0 };
1732         struct flowi6 fl6;
1733         struct dst_entry *dst;
1734
1735         if (type == ICMPV6_MGM_REDUCTION)
1736                 snd_addr = &in6addr_linklocal_allrouters;
1737         else
1738                 snd_addr = addr;
1739
1740         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1741         payload_len = len + sizeof(ra);
1742         full_len = sizeof(struct ipv6hdr) + payload_len;
1743
1744         rcu_read_lock();
1745         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1746                       IPSTATS_MIB_OUT, full_len);
1747         rcu_read_unlock();
1748
1749         skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1750
1751         if (skb == NULL) {
1752                 rcu_read_lock();
1753                 IP6_INC_STATS(net, __in6_dev_get(dev),
1754                               IPSTATS_MIB_OUTDISCARDS);
1755                 rcu_read_unlock();
1756                 return;
1757         }
1758
1759         skb_reserve(skb, LL_RESERVED_SPACE(dev));
1760
1761         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1762                 /* <draft-ietf-magma-mld-source-05.txt>:
1763                  * use unspecified address as the source address
1764                  * when a valid link-local address is not available.
1765                  */
1766                 saddr = &in6addr_any;
1767         } else
1768                 saddr = &addr_buf;
1769
1770         ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1771
1772         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1773
1774         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1775         memset(hdr, 0, sizeof(struct mld_msg));
1776         hdr->mld_type = type;
1777         ipv6_addr_copy(&hdr->mld_mca, addr);
1778
1779         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1780                                          IPPROTO_ICMPV6,
1781                                          csum_partial(hdr, len, 0));
1782
1783         rcu_read_lock();
1784         idev = __in6_dev_get(skb->dev);
1785
1786         dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1787         if (!dst) {
1788                 err = -ENOMEM;
1789                 goto err_out;
1790         }
1791
1792         icmpv6_flow_init(sk, &fl6, type,
1793                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1794                          skb->dev->ifindex);
1795
1796         dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1797         if (IS_ERR(dst)) {
1798                 err = PTR_ERR(dst);
1799                 goto err_out;
1800         }
1801
1802         skb_dst_set(skb, dst);
1803         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1804                       dst_output);
1805 out:
1806         if (!err) {
1807                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1808                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1809                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1810         } else
1811                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1812
1813         rcu_read_unlock();
1814         return;
1815
1816 err_out:
1817         kfree_skb(skb);
1818         goto out;
1819 }
1820
1821 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1822         const struct in6_addr *psfsrc)
1823 {
1824         struct ip6_sf_list *psf, *psf_prev;
1825         int rv = 0;
1826
1827         psf_prev = NULL;
1828         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1829                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1830                         break;
1831                 psf_prev = psf;
1832         }
1833         if (!psf || psf->sf_count[sfmode] == 0) {
1834                 /* source filter not found, or count wrong =>  bug */
1835                 return -ESRCH;
1836         }
1837         psf->sf_count[sfmode]--;
1838         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1839                 struct inet6_dev *idev = pmc->idev;
1840
1841                 /* no more filters for this source */
1842                 if (psf_prev)
1843                         psf_prev->sf_next = psf->sf_next;
1844                 else
1845                         pmc->mca_sources = psf->sf_next;
1846                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1847                     !MLD_V1_SEEN(idev)) {
1848                         psf->sf_crcount = idev->mc_qrv;
1849                         psf->sf_next = pmc->mca_tomb;
1850                         pmc->mca_tomb = psf;
1851                         rv = 1;
1852                 } else
1853                         kfree(psf);
1854         }
1855         return rv;
1856 }
1857
1858 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1859                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1860                           int delta)
1861 {
1862         struct ifmcaddr6 *pmc;
1863         int     changerec = 0;
1864         int     i, err;
1865
1866         if (!idev)
1867                 return -ENODEV;
1868         read_lock_bh(&idev->lock);
1869         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1870                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1871                         break;
1872         }
1873         if (!pmc) {
1874                 /* MCA not found?? bug */
1875                 read_unlock_bh(&idev->lock);
1876                 return -ESRCH;
1877         }
1878         spin_lock_bh(&pmc->mca_lock);
1879         sf_markstate(pmc);
1880         if (!delta) {
1881                 if (!pmc->mca_sfcount[sfmode]) {
1882                         spin_unlock_bh(&pmc->mca_lock);
1883                         read_unlock_bh(&idev->lock);
1884                         return -EINVAL;
1885                 }
1886                 pmc->mca_sfcount[sfmode]--;
1887         }
1888         err = 0;
1889         for (i=0; i<sfcount; i++) {
1890                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1891
1892                 changerec |= rv > 0;
1893                 if (!err && rv < 0)
1894                         err = rv;
1895         }
1896         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1897             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1898             pmc->mca_sfcount[MCAST_INCLUDE]) {
1899                 struct ip6_sf_list *psf;
1900
1901                 /* filter mode change */
1902                 pmc->mca_sfmode = MCAST_INCLUDE;
1903                 pmc->mca_crcount = idev->mc_qrv;
1904                 idev->mc_ifc_count = pmc->mca_crcount;
1905                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1906                         psf->sf_crcount = 0;
1907                 mld_ifc_event(pmc->idev);
1908         } else if (sf_setstate(pmc) || changerec)
1909                 mld_ifc_event(pmc->idev);
1910         spin_unlock_bh(&pmc->mca_lock);
1911         read_unlock_bh(&idev->lock);
1912         return err;
1913 }
1914
1915 /*
1916  * Add multicast single-source filter to the interface list
1917  */
1918 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1919         const struct in6_addr *psfsrc, int delta)
1920 {
1921         struct ip6_sf_list *psf, *psf_prev;
1922
1923         psf_prev = NULL;
1924         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1925                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1926                         break;
1927                 psf_prev = psf;
1928         }
1929         if (!psf) {
1930                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1931                 if (!psf)
1932                         return -ENOBUFS;
1933
1934                 psf->sf_addr = *psfsrc;
1935                 if (psf_prev) {
1936                         psf_prev->sf_next = psf;
1937                 } else
1938                         pmc->mca_sources = psf;
1939         }
1940         psf->sf_count[sfmode]++;
1941         return 0;
1942 }
1943
1944 static void sf_markstate(struct ifmcaddr6 *pmc)
1945 {
1946         struct ip6_sf_list *psf;
1947         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1948
1949         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1950                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1951                         psf->sf_oldin = mca_xcount ==
1952                                 psf->sf_count[MCAST_EXCLUDE] &&
1953                                 !psf->sf_count[MCAST_INCLUDE];
1954                 } else
1955                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1956 }
1957
1958 static int sf_setstate(struct ifmcaddr6 *pmc)
1959 {
1960         struct ip6_sf_list *psf, *dpsf;
1961         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1962         int qrv = pmc->idev->mc_qrv;
1963         int new_in, rv;
1964
1965         rv = 0;
1966         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1967                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1968                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1969                                 !psf->sf_count[MCAST_INCLUDE];
1970                 } else
1971                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1972                 if (new_in) {
1973                         if (!psf->sf_oldin) {
1974                                 struct ip6_sf_list *prev = NULL;
1975
1976                                 for (dpsf=pmc->mca_tomb; dpsf;
1977                                      dpsf=dpsf->sf_next) {
1978                                         if (ipv6_addr_equal(&dpsf->sf_addr,
1979                                             &psf->sf_addr))
1980                                                 break;
1981                                         prev = dpsf;
1982                                 }
1983                                 if (dpsf) {
1984                                         if (prev)
1985                                                 prev->sf_next = dpsf->sf_next;
1986                                         else
1987                                                 pmc->mca_tomb = dpsf->sf_next;
1988                                         kfree(dpsf);
1989                                 }
1990                                 psf->sf_crcount = qrv;
1991                                 rv++;
1992                         }
1993                 } else if (psf->sf_oldin) {
1994                         psf->sf_crcount = 0;
1995                         /*
1996                          * add or update "delete" records if an active filter
1997                          * is now inactive
1998                          */
1999                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2000                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2001                                     &psf->sf_addr))
2002                                         break;
2003                         if (!dpsf) {
2004                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2005                                 if (!dpsf)
2006                                         continue;
2007                                 *dpsf = *psf;
2008                                 /* pmc->mca_lock held by callers */
2009                                 dpsf->sf_next = pmc->mca_tomb;
2010                                 pmc->mca_tomb = dpsf;
2011                         }
2012                         dpsf->sf_crcount = qrv;
2013                         rv++;
2014                 }
2015         }
2016         return rv;
2017 }
2018
2019 /*
2020  * Add multicast source filter list to the interface list
2021  */
2022 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2023                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2024                           int delta)
2025 {
2026         struct ifmcaddr6 *pmc;
2027         int     isexclude;
2028         int     i, err;
2029
2030         if (!idev)
2031                 return -ENODEV;
2032         read_lock_bh(&idev->lock);
2033         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2034                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2035                         break;
2036         }
2037         if (!pmc) {
2038                 /* MCA not found?? bug */
2039                 read_unlock_bh(&idev->lock);
2040                 return -ESRCH;
2041         }
2042         spin_lock_bh(&pmc->mca_lock);
2043
2044         sf_markstate(pmc);
2045         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2046         if (!delta)
2047                 pmc->mca_sfcount[sfmode]++;
2048         err = 0;
2049         for (i=0; i<sfcount; i++) {
2050                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2051                 if (err)
2052                         break;
2053         }
2054         if (err) {
2055                 int j;
2056
2057                 if (!delta)
2058                         pmc->mca_sfcount[sfmode]--;
2059                 for (j=0; j<i; j++)
2060                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2061         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2062                 struct ip6_sf_list *psf;
2063
2064                 /* filter mode change */
2065                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2066                         pmc->mca_sfmode = MCAST_EXCLUDE;
2067                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2068                         pmc->mca_sfmode = MCAST_INCLUDE;
2069                 /* else no filters; keep old mode for reports */
2070
2071                 pmc->mca_crcount = idev->mc_qrv;
2072                 idev->mc_ifc_count = pmc->mca_crcount;
2073                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2074                         psf->sf_crcount = 0;
2075                 mld_ifc_event(idev);
2076         } else if (sf_setstate(pmc))
2077                 mld_ifc_event(idev);
2078         spin_unlock_bh(&pmc->mca_lock);
2079         read_unlock_bh(&idev->lock);
2080         return err;
2081 }
2082
2083 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2084 {
2085         struct ip6_sf_list *psf, *nextpsf;
2086
2087         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2088                 nextpsf = psf->sf_next;
2089                 kfree(psf);
2090         }
2091         pmc->mca_tomb = NULL;
2092         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2093                 nextpsf = psf->sf_next;
2094                 kfree(psf);
2095         }
2096         pmc->mca_sources = NULL;
2097         pmc->mca_sfmode = MCAST_EXCLUDE;
2098         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2099         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2100 }
2101
2102
2103 static void igmp6_join_group(struct ifmcaddr6 *ma)
2104 {
2105         unsigned long delay;
2106
2107         if (ma->mca_flags & MAF_NOREPORT)
2108                 return;
2109
2110         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2111
2112         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2113
2114         spin_lock_bh(&ma->mca_lock);
2115         if (del_timer(&ma->mca_timer)) {
2116                 atomic_dec(&ma->mca_refcnt);
2117                 delay = ma->mca_timer.expires - jiffies;
2118         }
2119
2120         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2121                 atomic_inc(&ma->mca_refcnt);
2122         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2123         spin_unlock_bh(&ma->mca_lock);
2124 }
2125
2126 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2127                             struct inet6_dev *idev)
2128 {
2129         int err;
2130
2131         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2132          * so no other readers or writers of iml or its sflist
2133          */
2134         if (!iml->sflist) {
2135                 /* any-source empty exclude case */
2136                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2137         }
2138         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2139                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2140         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2141         iml->sflist = NULL;
2142         return err;
2143 }
2144
2145 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2146 {
2147         if (MLD_V1_SEEN(ma->idev)) {
2148                 if (ma->mca_flags & MAF_LAST_REPORTER)
2149                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2150                                 ICMPV6_MGM_REDUCTION);
2151         } else {
2152                 mld_add_delrec(ma->idev, ma);
2153                 mld_ifc_event(ma->idev);
2154         }
2155 }
2156
2157 static void mld_gq_timer_expire(unsigned long data)
2158 {
2159         struct inet6_dev *idev = (struct inet6_dev *)data;
2160
2161         idev->mc_gq_running = 0;
2162         mld_send_report(idev, NULL);
2163         in6_dev_put(idev);
2164 }
2165
2166 static void mld_ifc_timer_expire(unsigned long data)
2167 {
2168         struct inet6_dev *idev = (struct inet6_dev *)data;
2169
2170         mld_send_cr(idev);
2171         if (idev->mc_ifc_count) {
2172                 idev->mc_ifc_count--;
2173                 if (idev->mc_ifc_count)
2174                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2175         }
2176         in6_dev_put(idev);
2177 }
2178
2179 static void mld_ifc_event(struct inet6_dev *idev)
2180 {
2181         if (MLD_V1_SEEN(idev))
2182                 return;
2183         idev->mc_ifc_count = idev->mc_qrv;
2184         mld_ifc_start_timer(idev, 1);
2185 }
2186
2187
2188 static void igmp6_timer_handler(unsigned long data)
2189 {
2190         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2191
2192         if (MLD_V1_SEEN(ma->idev))
2193                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2194         else
2195                 mld_send_report(ma->idev, ma);
2196
2197         spin_lock(&ma->mca_lock);
2198         ma->mca_flags |=  MAF_LAST_REPORTER;
2199         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2200         spin_unlock(&ma->mca_lock);
2201         ma_put(ma);
2202 }
2203
2204 /* Device changing type */
2205
2206 void ipv6_mc_unmap(struct inet6_dev *idev)
2207 {
2208         struct ifmcaddr6 *i;
2209
2210         /* Install multicast list, except for all-nodes (already installed) */
2211
2212         read_lock_bh(&idev->lock);
2213         for (i = idev->mc_list; i; i = i->next)
2214                 igmp6_group_dropped(i);
2215         read_unlock_bh(&idev->lock);
2216 }
2217
2218 void ipv6_mc_remap(struct inet6_dev *idev)
2219 {
2220         ipv6_mc_up(idev);
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         spin_lock_init(&idev->mc_lock);
2267         idev->mc_gq_running = 0;
2268         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2269                         (unsigned long)idev);
2270         idev->mc_tomb = NULL;
2271         idev->mc_ifc_count = 0;
2272         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2273                         (unsigned long)idev);
2274         idev->mc_qrv = MLD_QRV_DEFAULT;
2275         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2276         idev->mc_v1_seen = 0;
2277         write_unlock_bh(&idev->lock);
2278 }
2279
2280 /*
2281  *      Device is about to be destroyed: clean up.
2282  */
2283
2284 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2285 {
2286         struct ifmcaddr6 *i;
2287
2288         /* Deactivate timers */
2289         ipv6_mc_down(idev);
2290
2291         /* Delete all-nodes address. */
2292         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2293          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2294          * fail.
2295          */
2296         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2297
2298         if (idev->cnf.forwarding)
2299                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2300
2301         write_lock_bh(&idev->lock);
2302         while ((i = idev->mc_list) != NULL) {
2303                 idev->mc_list = i->next;
2304                 write_unlock_bh(&idev->lock);
2305
2306                 igmp6_group_dropped(i);
2307                 ma_put(i);
2308
2309                 write_lock_bh(&idev->lock);
2310         }
2311         write_unlock_bh(&idev->lock);
2312 }
2313
2314 #ifdef CONFIG_PROC_FS
2315 struct igmp6_mc_iter_state {
2316         struct seq_net_private p;
2317         struct net_device *dev;
2318         struct inet6_dev *idev;
2319 };
2320
2321 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2322
2323 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2324 {
2325         struct ifmcaddr6 *im = NULL;
2326         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2327         struct net *net = seq_file_net(seq);
2328
2329         state->idev = NULL;
2330         for_each_netdev_rcu(net, state->dev) {
2331                 struct inet6_dev *idev;
2332                 idev = __in6_dev_get(state->dev);
2333                 if (!idev)
2334                         continue;
2335                 read_lock_bh(&idev->lock);
2336                 im = idev->mc_list;
2337                 if (im) {
2338                         state->idev = idev;
2339                         break;
2340                 }
2341                 read_unlock_bh(&idev->lock);
2342         }
2343         return im;
2344 }
2345
2346 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2347 {
2348         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2349
2350         im = im->next;
2351         while (!im) {
2352                 if (likely(state->idev != NULL))
2353                         read_unlock_bh(&state->idev->lock);
2354
2355                 state->dev = next_net_device_rcu(state->dev);
2356                 if (!state->dev) {
2357                         state->idev = NULL;
2358                         break;
2359                 }
2360                 state->idev = __in6_dev_get(state->dev);
2361                 if (!state->idev)
2362                         continue;
2363                 read_lock_bh(&state->idev->lock);
2364                 im = state->idev->mc_list;
2365         }
2366         return im;
2367 }
2368
2369 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2370 {
2371         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2372         if (im)
2373                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2374                         --pos;
2375         return pos ? NULL : im;
2376 }
2377
2378 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2379         __acquires(RCU)
2380 {
2381         rcu_read_lock();
2382         return igmp6_mc_get_idx(seq, *pos);
2383 }
2384
2385 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2386 {
2387         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2388
2389         ++*pos;
2390         return im;
2391 }
2392
2393 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2394         __releases(RCU)
2395 {
2396         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2397
2398         if (likely(state->idev != NULL)) {
2399                 read_unlock_bh(&state->idev->lock);
2400                 state->idev = NULL;
2401         }
2402         state->dev = NULL;
2403         rcu_read_unlock();
2404 }
2405
2406 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2407 {
2408         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2409         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2410
2411         seq_printf(seq,
2412                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2413                    state->dev->ifindex, state->dev->name,
2414                    &im->mca_addr,
2415                    im->mca_users, im->mca_flags,
2416                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2417                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2418         return 0;
2419 }
2420
2421 static const struct seq_operations igmp6_mc_seq_ops = {
2422         .start  =       igmp6_mc_seq_start,
2423         .next   =       igmp6_mc_seq_next,
2424         .stop   =       igmp6_mc_seq_stop,
2425         .show   =       igmp6_mc_seq_show,
2426 };
2427
2428 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2429 {
2430         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2431                             sizeof(struct igmp6_mc_iter_state));
2432 }
2433
2434 static const struct file_operations igmp6_mc_seq_fops = {
2435         .owner          =       THIS_MODULE,
2436         .open           =       igmp6_mc_seq_open,
2437         .read           =       seq_read,
2438         .llseek         =       seq_lseek,
2439         .release        =       seq_release_net,
2440 };
2441
2442 struct igmp6_mcf_iter_state {
2443         struct seq_net_private p;
2444         struct net_device *dev;
2445         struct inet6_dev *idev;
2446         struct ifmcaddr6 *im;
2447 };
2448
2449 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2450
2451 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2452 {
2453         struct ip6_sf_list *psf = NULL;
2454         struct ifmcaddr6 *im = NULL;
2455         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2456         struct net *net = seq_file_net(seq);
2457
2458         state->idev = NULL;
2459         state->im = NULL;
2460         for_each_netdev_rcu(net, state->dev) {
2461                 struct inet6_dev *idev;
2462                 idev = __in6_dev_get(state->dev);
2463                 if (unlikely(idev == NULL))
2464                         continue;
2465                 read_lock_bh(&idev->lock);
2466                 im = idev->mc_list;
2467                 if (likely(im != NULL)) {
2468                         spin_lock_bh(&im->mca_lock);
2469                         psf = im->mca_sources;
2470                         if (likely(psf != NULL)) {
2471                                 state->im = im;
2472                                 state->idev = idev;
2473                                 break;
2474                         }
2475                         spin_unlock_bh(&im->mca_lock);
2476                 }
2477                 read_unlock_bh(&idev->lock);
2478         }
2479         return psf;
2480 }
2481
2482 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2483 {
2484         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2485
2486         psf = psf->sf_next;
2487         while (!psf) {
2488                 spin_unlock_bh(&state->im->mca_lock);
2489                 state->im = state->im->next;
2490                 while (!state->im) {
2491                         if (likely(state->idev != NULL))
2492                                 read_unlock_bh(&state->idev->lock);
2493
2494                         state->dev = next_net_device_rcu(state->dev);
2495                         if (!state->dev) {
2496                                 state->idev = NULL;
2497                                 goto out;
2498                         }
2499                         state->idev = __in6_dev_get(state->dev);
2500                         if (!state->idev)
2501                                 continue;
2502                         read_lock_bh(&state->idev->lock);
2503                         state->im = state->idev->mc_list;
2504                 }
2505                 if (!state->im)
2506                         break;
2507                 spin_lock_bh(&state->im->mca_lock);
2508                 psf = state->im->mca_sources;
2509         }
2510 out:
2511         return psf;
2512 }
2513
2514 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2515 {
2516         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2517         if (psf)
2518                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2519                         --pos;
2520         return pos ? NULL : psf;
2521 }
2522
2523 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2524         __acquires(RCU)
2525 {
2526         rcu_read_lock();
2527         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2528 }
2529
2530 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2531 {
2532         struct ip6_sf_list *psf;
2533         if (v == SEQ_START_TOKEN)
2534                 psf = igmp6_mcf_get_first(seq);
2535         else
2536                 psf = igmp6_mcf_get_next(seq, v);
2537         ++*pos;
2538         return psf;
2539 }
2540
2541 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2542         __releases(RCU)
2543 {
2544         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2545         if (likely(state->im != NULL)) {
2546                 spin_unlock_bh(&state->im->mca_lock);
2547                 state->im = NULL;
2548         }
2549         if (likely(state->idev != NULL)) {
2550                 read_unlock_bh(&state->idev->lock);
2551                 state->idev = NULL;
2552         }
2553         state->dev = NULL;
2554         rcu_read_unlock();
2555 }
2556
2557 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2558 {
2559         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2560         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2561
2562         if (v == SEQ_START_TOKEN) {
2563                 seq_printf(seq,
2564                            "%3s %6s "
2565                            "%32s %32s %6s %6s\n", "Idx",
2566                            "Device", "Multicast Address",
2567                            "Source Address", "INC", "EXC");
2568         } else {
2569                 seq_printf(seq,
2570                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2571                            state->dev->ifindex, state->dev->name,
2572                            &state->im->mca_addr,
2573                            &psf->sf_addr,
2574                            psf->sf_count[MCAST_INCLUDE],
2575                            psf->sf_count[MCAST_EXCLUDE]);
2576         }
2577         return 0;
2578 }
2579
2580 static const struct seq_operations igmp6_mcf_seq_ops = {
2581         .start  =       igmp6_mcf_seq_start,
2582         .next   =       igmp6_mcf_seq_next,
2583         .stop   =       igmp6_mcf_seq_stop,
2584         .show   =       igmp6_mcf_seq_show,
2585 };
2586
2587 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2588 {
2589         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2590                             sizeof(struct igmp6_mcf_iter_state));
2591 }
2592
2593 static const struct file_operations igmp6_mcf_seq_fops = {
2594         .owner          =       THIS_MODULE,
2595         .open           =       igmp6_mcf_seq_open,
2596         .read           =       seq_read,
2597         .llseek         =       seq_lseek,
2598         .release        =       seq_release_net,
2599 };
2600
2601 static int __net_init igmp6_proc_init(struct net *net)
2602 {
2603         int err;
2604
2605         err = -ENOMEM;
2606         if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2607                 goto out;
2608         if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2609                                   &igmp6_mcf_seq_fops))
2610                 goto out_proc_net_igmp6;
2611
2612         err = 0;
2613 out:
2614         return err;
2615
2616 out_proc_net_igmp6:
2617         proc_net_remove(net, "igmp6");
2618         goto out;
2619 }
2620
2621 static void __net_exit igmp6_proc_exit(struct net *net)
2622 {
2623         proc_net_remove(net, "mcfilter6");
2624         proc_net_remove(net, "igmp6");
2625 }
2626 #else
2627 static inline int igmp6_proc_init(struct net *net)
2628 {
2629         return 0;
2630 }
2631 static inline void igmp6_proc_exit(struct net *net)
2632 {
2633 }
2634 #endif
2635
2636 static int __net_init igmp6_net_init(struct net *net)
2637 {
2638         int err;
2639
2640         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2641                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2642         if (err < 0) {
2643                 printk(KERN_ERR
2644                        "Failed to initialize the IGMP6 control socket (err %d).\n",
2645                        err);
2646                 goto out;
2647         }
2648
2649         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2650
2651         err = igmp6_proc_init(net);
2652         if (err)
2653                 goto out_sock_create;
2654 out:
2655         return err;
2656
2657 out_sock_create:
2658         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2659         goto out;
2660 }
2661
2662 static void __net_exit igmp6_net_exit(struct net *net)
2663 {
2664         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2665         igmp6_proc_exit(net);
2666 }
2667
2668 static struct pernet_operations igmp6_net_ops = {
2669         .init = igmp6_net_init,
2670         .exit = igmp6_net_exit,
2671 };
2672
2673 int __init igmp6_init(void)
2674 {
2675         return register_pernet_subsys(&igmp6_net_ops);
2676 }
2677
2678 void igmp6_cleanup(void)
2679 {
2680         unregister_pernet_subsys(&igmp6_net_ops);
2681 }