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Linux/net/ipv6/mcast.c

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  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 <linux/pkt_sched.h>
 48 #include <net/mld.h>
 49 
 50 #include <linux/netfilter.h>
 51 #include <linux/netfilter_ipv6.h>
 52 
 53 #include <net/net_namespace.h>
 54 #include <net/sock.h>
 55 #include <net/snmp.h>
 56 
 57 #include <net/ipv6.h>
 58 #include <net/protocol.h>
 59 #include <net/if_inet6.h>
 60 #include <net/ndisc.h>
 61 #include <net/addrconf.h>
 62 #include <net/ip6_route.h>
 63 #include <net/inet_common.h>
 64 
 65 #include <net/ip6_checksum.h>
 66 
 67 /* Ensure that we have struct in6_addr aligned on 32bit word. */
 68 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
 69         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
 70         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
 71         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
 72 };
 73 
 74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 75 
 76 static void igmp6_join_group(struct ifmcaddr6 *ma);
 77 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 78 static void igmp6_timer_handler(unsigned long data);
 79 
 80 static void mld_gq_timer_expire(unsigned long data);
 81 static void mld_ifc_timer_expire(unsigned long data);
 82 static void mld_ifc_event(struct inet6_dev *idev);
 83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 84 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
 85 static void mld_clear_delrec(struct inet6_dev *idev);
 86 static bool mld_in_v1_mode(const struct inet6_dev *idev);
 87 static int sf_setstate(struct ifmcaddr6 *pmc);
 88 static void sf_markstate(struct ifmcaddr6 *pmc);
 89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 91                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 92                           int delta);
 93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 94                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
 95                           int delta);
 96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 97                             struct inet6_dev *idev);
 98 
 99 #define MLD_QRV_DEFAULT         2
100 /* RFC3810, 9.2. Query Interval */
101 #define MLD_QI_DEFAULT          (125 * HZ)
102 /* RFC3810, 9.3. Query Response Interval */
103 #define MLD_QRI_DEFAULT         (10 * HZ)
104 
105 /* RFC3810, 8.1 Query Version Distinctions */
106 #define MLD_V1_QUERY_LEN        24
107 #define MLD_V2_QUERY_LEN_MIN    28
108 
109 #define IPV6_MLD_MAX_MSF        64
110 
111 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
112 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
113 
114 /*
115  *      socket join on multicast group
116  */
117 
118 #define for_each_pmc_rcu(np, pmc)                               \
119         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
120              pmc != NULL;                                       \
121              pmc = rcu_dereference(pmc->next))
122 
123 static int unsolicited_report_interval(struct inet6_dev *idev)
124 {
125         int iv;
126 
127         if (mld_in_v1_mode(idev))
128                 iv = idev->cnf.mldv1_unsolicited_report_interval;
129         else
130                 iv = idev->cnf.mldv2_unsolicited_report_interval;
131 
132         return iv > 0 ? iv : 1;
133 }
134 
135 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
136 {
137         struct net_device *dev = NULL;
138         struct ipv6_mc_socklist *mc_lst;
139         struct ipv6_pinfo *np = inet6_sk(sk);
140         struct net *net = sock_net(sk);
141         int err;
142 
143         ASSERT_RTNL();
144 
145         if (!ipv6_addr_is_multicast(addr))
146                 return -EINVAL;
147 
148         rcu_read_lock();
149         for_each_pmc_rcu(np, mc_lst) {
150                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
151                     ipv6_addr_equal(&mc_lst->addr, addr)) {
152                         rcu_read_unlock();
153                         return -EADDRINUSE;
154                 }
155         }
156         rcu_read_unlock();
157 
158         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
159 
160         if (!mc_lst)
161                 return -ENOMEM;
162 
163         mc_lst->next = NULL;
164         mc_lst->addr = *addr;
165 
166         if (ifindex == 0) {
167                 struct rt6_info *rt;
168                 rt = rt6_lookup(net, addr, NULL, 0, 0);
169                 if (rt) {
170                         dev = rt->dst.dev;
171                         ip6_rt_put(rt);
172                 }
173         } else
174                 dev = __dev_get_by_index(net, ifindex);
175 
176         if (!dev) {
177                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
178                 return -ENODEV;
179         }
180 
181         mc_lst->ifindex = dev->ifindex;
182         mc_lst->sfmode = MCAST_EXCLUDE;
183         rwlock_init(&mc_lst->sflock);
184         mc_lst->sflist = NULL;
185 
186         /*
187          *      now add/increase the group membership on the device
188          */
189 
190         err = ipv6_dev_mc_inc(dev, addr);
191 
192         if (err) {
193                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
194                 return err;
195         }
196 
197         mc_lst->next = np->ipv6_mc_list;
198         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
199 
200         return 0;
201 }
202 EXPORT_SYMBOL(ipv6_sock_mc_join);
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         ASSERT_RTNL();
215 
216         if (!ipv6_addr_is_multicast(addr))
217                 return -EINVAL;
218 
219         for (lnk = &np->ipv6_mc_list;
220              (mc_lst = rtnl_dereference(*lnk)) != NULL;
221               lnk = &mc_lst->next) {
222                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223                     ipv6_addr_equal(&mc_lst->addr, addr)) {
224                         struct net_device *dev;
225 
226                         *lnk = mc_lst->next;
227 
228                         dev = __dev_get_by_index(net, mc_lst->ifindex);
229                         if (dev) {
230                                 struct inet6_dev *idev = __in6_dev_get(dev);
231 
232                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
233                                 if (idev)
234                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
235                         } else
236                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
237 
238                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
239                         kfree_rcu(mc_lst, rcu);
240                         return 0;
241                 }
242         }
243 
244         return -EADDRNOTAVAIL;
245 }
246 EXPORT_SYMBOL(ipv6_sock_mc_drop);
247 
248 /* called with rcu_read_lock() */
249 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
250                                              const struct in6_addr *group,
251                                              int ifindex)
252 {
253         struct net_device *dev = NULL;
254         struct inet6_dev *idev = NULL;
255 
256         if (ifindex == 0) {
257                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
258 
259                 if (rt) {
260                         dev = rt->dst.dev;
261                         ip6_rt_put(rt);
262                 }
263         } else
264                 dev = dev_get_by_index_rcu(net, ifindex);
265 
266         if (!dev)
267                 return NULL;
268         idev = __in6_dev_get(dev);
269         if (!idev)
270                 return NULL;
271         read_lock_bh(&idev->lock);
272         if (idev->dead) {
273                 read_unlock_bh(&idev->lock);
274                 return NULL;
275         }
276         return idev;
277 }
278 
279 void ipv6_sock_mc_close(struct sock *sk)
280 {
281         struct ipv6_pinfo *np = inet6_sk(sk);
282         struct ipv6_mc_socklist *mc_lst;
283         struct net *net = sock_net(sk);
284 
285         if (!rcu_access_pointer(np->ipv6_mc_list))
286                 return;
287 
288         rtnl_lock();
289         while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
290                 struct net_device *dev;
291 
292                 np->ipv6_mc_list = mc_lst->next;
293 
294                 dev = __dev_get_by_index(net, mc_lst->ifindex);
295                 if (dev) {
296                         struct inet6_dev *idev = __in6_dev_get(dev);
297 
298                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
299                         if (idev)
300                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
301                 } else
302                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
303 
304                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
305                 kfree_rcu(mc_lst, rcu);
306 
307         }
308         rtnl_unlock();
309 }
310 
311 int ip6_mc_source(int add, int omode, struct sock *sk,
312         struct group_source_req *pgsr)
313 {
314         struct in6_addr *source, *group;
315         struct ipv6_mc_socklist *pmc;
316         struct inet6_dev *idev;
317         struct ipv6_pinfo *inet6 = inet6_sk(sk);
318         struct ip6_sf_socklist *psl;
319         struct net *net = sock_net(sk);
320         int i, j, rv;
321         int leavegroup = 0;
322         int pmclocked = 0;
323         int err;
324 
325         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
326         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
327 
328         if (!ipv6_addr_is_multicast(group))
329                 return -EINVAL;
330 
331         rcu_read_lock();
332         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
333         if (!idev) {
334                 rcu_read_unlock();
335                 return -ENODEV;
336         }
337 
338         err = -EADDRNOTAVAIL;
339 
340         for_each_pmc_rcu(inet6, pmc) {
341                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
342                         continue;
343                 if (ipv6_addr_equal(&pmc->addr, group))
344                         break;
345         }
346         if (!pmc) {             /* must have a prior join */
347                 err = -EINVAL;
348                 goto done;
349         }
350         /* if a source filter was set, must be the same mode as before */
351         if (pmc->sflist) {
352                 if (pmc->sfmode != omode) {
353                         err = -EINVAL;
354                         goto done;
355                 }
356         } else if (pmc->sfmode != omode) {
357                 /* allow mode switches for empty-set filters */
358                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
359                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
360                 pmc->sfmode = omode;
361         }
362 
363         write_lock(&pmc->sflock);
364         pmclocked = 1;
365 
366         psl = pmc->sflist;
367         if (!add) {
368                 if (!psl)
369                         goto done;      /* err = -EADDRNOTAVAIL */
370                 rv = !0;
371                 for (i = 0; i < psl->sl_count; i++) {
372                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
373                         if (rv == 0)
374                                 break;
375                 }
376                 if (rv)         /* source not found */
377                         goto done;      /* err = -EADDRNOTAVAIL */
378 
379                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
380                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
381                         leavegroup = 1;
382                         goto done;
383                 }
384 
385                 /* update the interface filter */
386                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
387 
388                 for (j = i+1; j < psl->sl_count; j++)
389                         psl->sl_addr[j-1] = psl->sl_addr[j];
390                 psl->sl_count--;
391                 err = 0;
392                 goto done;
393         }
394         /* else, add a new source to the filter */
395 
396         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
397                 err = -ENOBUFS;
398                 goto done;
399         }
400         if (!psl || psl->sl_count == psl->sl_max) {
401                 struct ip6_sf_socklist *newpsl;
402                 int count = IP6_SFBLOCK;
403 
404                 if (psl)
405                         count += psl->sl_max;
406                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
407                 if (!newpsl) {
408                         err = -ENOBUFS;
409                         goto done;
410                 }
411                 newpsl->sl_max = count;
412                 newpsl->sl_count = count - IP6_SFBLOCK;
413                 if (psl) {
414                         for (i = 0; i < psl->sl_count; i++)
415                                 newpsl->sl_addr[i] = psl->sl_addr[i];
416                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
417                 }
418                 pmc->sflist = psl = newpsl;
419         }
420         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
421         for (i = 0; i < psl->sl_count; i++) {
422                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
423                 if (rv == 0) /* There is an error in the address. */
424                         goto done;
425         }
426         for (j = psl->sl_count-1; j >= i; j--)
427                 psl->sl_addr[j+1] = psl->sl_addr[j];
428         psl->sl_addr[i] = *source;
429         psl->sl_count++;
430         err = 0;
431         /* update the interface list */
432         ip6_mc_add_src(idev, group, omode, 1, source, 1);
433 done:
434         if (pmclocked)
435                 write_unlock(&pmc->sflock);
436         read_unlock_bh(&idev->lock);
437         rcu_read_unlock();
438         if (leavegroup)
439                 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
440         return err;
441 }
442 
443 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
444 {
445         const struct in6_addr *group;
446         struct ipv6_mc_socklist *pmc;
447         struct inet6_dev *idev;
448         struct ipv6_pinfo *inet6 = inet6_sk(sk);
449         struct ip6_sf_socklist *newpsl, *psl;
450         struct net *net = sock_net(sk);
451         int leavegroup = 0;
452         int i, err;
453 
454         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
455 
456         if (!ipv6_addr_is_multicast(group))
457                 return -EINVAL;
458         if (gsf->gf_fmode != MCAST_INCLUDE &&
459             gsf->gf_fmode != MCAST_EXCLUDE)
460                 return -EINVAL;
461 
462         rcu_read_lock();
463         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
464 
465         if (!idev) {
466                 rcu_read_unlock();
467                 return -ENODEV;
468         }
469 
470         err = 0;
471 
472         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
473                 leavegroup = 1;
474                 goto done;
475         }
476 
477         for_each_pmc_rcu(inet6, pmc) {
478                 if (pmc->ifindex != gsf->gf_interface)
479                         continue;
480                 if (ipv6_addr_equal(&pmc->addr, group))
481                         break;
482         }
483         if (!pmc) {             /* must have a prior join */
484                 err = -EINVAL;
485                 goto done;
486         }
487         if (gsf->gf_numsrc) {
488                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
489                                                           GFP_ATOMIC);
490                 if (!newpsl) {
491                         err = -ENOBUFS;
492                         goto done;
493                 }
494                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
495                 for (i = 0; i < newpsl->sl_count; ++i) {
496                         struct sockaddr_in6 *psin6;
497 
498                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
499                         newpsl->sl_addr[i] = psin6->sin6_addr;
500                 }
501                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
502                         newpsl->sl_count, newpsl->sl_addr, 0);
503                 if (err) {
504                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
505                         goto done;
506                 }
507         } else {
508                 newpsl = NULL;
509                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
510         }
511 
512         write_lock(&pmc->sflock);
513         psl = pmc->sflist;
514         if (psl) {
515                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
516                         psl->sl_count, psl->sl_addr, 0);
517                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
518         } else
519                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
520         pmc->sflist = newpsl;
521         pmc->sfmode = gsf->gf_fmode;
522         write_unlock(&pmc->sflock);
523         err = 0;
524 done:
525         read_unlock_bh(&idev->lock);
526         rcu_read_unlock();
527         if (leavegroup)
528                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
529         return err;
530 }
531 
532 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
533         struct group_filter __user *optval, int __user *optlen)
534 {
535         int err, i, count, copycount;
536         const struct in6_addr *group;
537         struct ipv6_mc_socklist *pmc;
538         struct inet6_dev *idev;
539         struct ipv6_pinfo *inet6 = inet6_sk(sk);
540         struct ip6_sf_socklist *psl;
541         struct net *net = sock_net(sk);
542 
543         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
544 
545         if (!ipv6_addr_is_multicast(group))
546                 return -EINVAL;
547 
548         rcu_read_lock();
549         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
550 
551         if (!idev) {
552                 rcu_read_unlock();
553                 return -ENODEV;
554         }
555 
556         err = -EADDRNOTAVAIL;
557         /* changes to the ipv6_mc_list require the socket lock and
558          * rtnl lock. We have the socket lock and rcu read lock,
559          * so reading the list is safe.
560          */
561 
562         for_each_pmc_rcu(inet6, pmc) {
563                 if (pmc->ifindex != gsf->gf_interface)
564                         continue;
565                 if (ipv6_addr_equal(group, &pmc->addr))
566                         break;
567         }
568         if (!pmc)               /* must have a prior join */
569                 goto done;
570         gsf->gf_fmode = pmc->sfmode;
571         psl = pmc->sflist;
572         count = psl ? psl->sl_count : 0;
573         read_unlock_bh(&idev->lock);
574         rcu_read_unlock();
575 
576         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
577         gsf->gf_numsrc = count;
578         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
579             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
580                 return -EFAULT;
581         }
582         /* changes to psl require the socket lock, and a write lock
583          * on pmc->sflock. We have the socket lock so reading here is safe.
584          */
585         for (i = 0; i < copycount; i++) {
586                 struct sockaddr_in6 *psin6;
587                 struct sockaddr_storage ss;
588 
589                 psin6 = (struct sockaddr_in6 *)&ss;
590                 memset(&ss, 0, sizeof(ss));
591                 psin6->sin6_family = AF_INET6;
592                 psin6->sin6_addr = psl->sl_addr[i];
593                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
594                         return -EFAULT;
595         }
596         return 0;
597 done:
598         read_unlock_bh(&idev->lock);
599         rcu_read_unlock();
600         return err;
601 }
602 
603 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
604                     const struct in6_addr *src_addr)
605 {
606         struct ipv6_pinfo *np = inet6_sk(sk);
607         struct ipv6_mc_socklist *mc;
608         struct ip6_sf_socklist *psl;
609         bool rv = true;
610 
611         rcu_read_lock();
612         for_each_pmc_rcu(np, mc) {
613                 if (ipv6_addr_equal(&mc->addr, mc_addr))
614                         break;
615         }
616         if (!mc) {
617                 rcu_read_unlock();
618                 return true;
619         }
620         read_lock(&mc->sflock);
621         psl = mc->sflist;
622         if (!psl) {
623                 rv = mc->sfmode == MCAST_EXCLUDE;
624         } else {
625                 int i;
626 
627                 for (i = 0; i < psl->sl_count; i++) {
628                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
629                                 break;
630                 }
631                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
632                         rv = false;
633                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
634                         rv = false;
635         }
636         read_unlock(&mc->sflock);
637         rcu_read_unlock();
638 
639         return rv;
640 }
641 
642 static void igmp6_group_added(struct ifmcaddr6 *mc)
643 {
644         struct net_device *dev = mc->idev->dev;
645         char buf[MAX_ADDR_LEN];
646 
647         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
648             IPV6_ADDR_SCOPE_LINKLOCAL)
649                 return;
650 
651         spin_lock_bh(&mc->mca_lock);
652         if (!(mc->mca_flags&MAF_LOADED)) {
653                 mc->mca_flags |= MAF_LOADED;
654                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
655                         dev_mc_add(dev, buf);
656         }
657         spin_unlock_bh(&mc->mca_lock);
658 
659         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
660                 return;
661 
662         if (mld_in_v1_mode(mc->idev)) {
663                 igmp6_join_group(mc);
664                 return;
665         }
666         /* else v2 */
667 
668         mc->mca_crcount = mc->idev->mc_qrv;
669         mld_ifc_event(mc->idev);
670 }
671 
672 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
673 {
674         struct net_device *dev = mc->idev->dev;
675         char buf[MAX_ADDR_LEN];
676 
677         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
678             IPV6_ADDR_SCOPE_LINKLOCAL)
679                 return;
680 
681         spin_lock_bh(&mc->mca_lock);
682         if (mc->mca_flags&MAF_LOADED) {
683                 mc->mca_flags &= ~MAF_LOADED;
684                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
685                         dev_mc_del(dev, buf);
686         }
687 
688         if (mc->mca_flags & MAF_NOREPORT)
689                 goto done;
690         spin_unlock_bh(&mc->mca_lock);
691 
692         if (!mc->idev->dead)
693                 igmp6_leave_group(mc);
694 
695         spin_lock_bh(&mc->mca_lock);
696         if (del_timer(&mc->mca_timer))
697                 atomic_dec(&mc->mca_refcnt);
698 done:
699         ip6_mc_clear_src(mc);
700         spin_unlock_bh(&mc->mca_lock);
701 }
702 
703 /*
704  * deleted ifmcaddr6 manipulation
705  */
706 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
707 {
708         struct ifmcaddr6 *pmc;
709 
710         /* this is an "ifmcaddr6" for convenience; only the fields below
711          * are actually used. In particular, the refcnt and users are not
712          * used for management of the delete list. Using the same structure
713          * for deleted items allows change reports to use common code with
714          * non-deleted or query-response MCA's.
715          */
716         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
717         if (!pmc)
718                 return;
719 
720         spin_lock_bh(&im->mca_lock);
721         spin_lock_init(&pmc->mca_lock);
722         pmc->idev = im->idev;
723         in6_dev_hold(idev);
724         pmc->mca_addr = im->mca_addr;
725         pmc->mca_crcount = idev->mc_qrv;
726         pmc->mca_sfmode = im->mca_sfmode;
727         if (pmc->mca_sfmode == MCAST_INCLUDE) {
728                 struct ip6_sf_list *psf;
729 
730                 pmc->mca_tomb = im->mca_tomb;
731                 pmc->mca_sources = im->mca_sources;
732                 im->mca_tomb = im->mca_sources = NULL;
733                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
734                         psf->sf_crcount = pmc->mca_crcount;
735         }
736         spin_unlock_bh(&im->mca_lock);
737 
738         spin_lock_bh(&idev->mc_lock);
739         pmc->next = idev->mc_tomb;
740         idev->mc_tomb = pmc;
741         spin_unlock_bh(&idev->mc_lock);
742 }
743 
744 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
745 {
746         struct ifmcaddr6 *pmc, *pmc_prev;
747         struct ip6_sf_list *psf, *psf_next;
748 
749         spin_lock_bh(&idev->mc_lock);
750         pmc_prev = NULL;
751         for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
752                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
753                         break;
754                 pmc_prev = pmc;
755         }
756         if (pmc) {
757                 if (pmc_prev)
758                         pmc_prev->next = pmc->next;
759                 else
760                         idev->mc_tomb = pmc->next;
761         }
762         spin_unlock_bh(&idev->mc_lock);
763 
764         if (pmc) {
765                 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
766                         psf_next = psf->sf_next;
767                         kfree(psf);
768                 }
769                 in6_dev_put(pmc->idev);
770                 kfree(pmc);
771         }
772 }
773 
774 static void mld_clear_delrec(struct inet6_dev *idev)
775 {
776         struct ifmcaddr6 *pmc, *nextpmc;
777 
778         spin_lock_bh(&idev->mc_lock);
779         pmc = idev->mc_tomb;
780         idev->mc_tomb = NULL;
781         spin_unlock_bh(&idev->mc_lock);
782 
783         for (; pmc; pmc = nextpmc) {
784                 nextpmc = pmc->next;
785                 ip6_mc_clear_src(pmc);
786                 in6_dev_put(pmc->idev);
787                 kfree(pmc);
788         }
789 
790         /* clear dead sources, too */
791         read_lock_bh(&idev->lock);
792         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
793                 struct ip6_sf_list *psf, *psf_next;
794 
795                 spin_lock_bh(&pmc->mca_lock);
796                 psf = pmc->mca_tomb;
797                 pmc->mca_tomb = NULL;
798                 spin_unlock_bh(&pmc->mca_lock);
799                 for (; psf; psf = psf_next) {
800                         psf_next = psf->sf_next;
801                         kfree(psf);
802                 }
803         }
804         read_unlock_bh(&idev->lock);
805 }
806 
807 static void mca_get(struct ifmcaddr6 *mc)
808 {
809         atomic_inc(&mc->mca_refcnt);
810 }
811 
812 static void ma_put(struct ifmcaddr6 *mc)
813 {
814         if (atomic_dec_and_test(&mc->mca_refcnt)) {
815                 in6_dev_put(mc->idev);
816                 kfree(mc);
817         }
818 }
819 
820 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
821                                    const struct in6_addr *addr)
822 {
823         struct ifmcaddr6 *mc;
824 
825         mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
826         if (!mc)
827                 return NULL;
828 
829         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
830 
831         mc->mca_addr = *addr;
832         mc->idev = idev; /* reference taken by caller */
833         mc->mca_users = 1;
834         /* mca_stamp should be updated upon changes */
835         mc->mca_cstamp = mc->mca_tstamp = jiffies;
836         atomic_set(&mc->mca_refcnt, 1);
837         spin_lock_init(&mc->mca_lock);
838 
839         /* initial mode is (EX, empty) */
840         mc->mca_sfmode = MCAST_EXCLUDE;
841         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
842 
843         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
844             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
845                 mc->mca_flags |= MAF_NOREPORT;
846 
847         return mc;
848 }
849 
850 /*
851  *      device multicast group inc (add if not found)
852  */
853 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
854 {
855         struct ifmcaddr6 *mc;
856         struct inet6_dev *idev;
857 
858         ASSERT_RTNL();
859 
860         /* we need to take a reference on idev */
861         idev = in6_dev_get(dev);
862 
863         if (!idev)
864                 return -EINVAL;
865 
866         write_lock_bh(&idev->lock);
867         if (idev->dead) {
868                 write_unlock_bh(&idev->lock);
869                 in6_dev_put(idev);
870                 return -ENODEV;
871         }
872 
873         for (mc = idev->mc_list; mc; mc = mc->next) {
874                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
875                         mc->mca_users++;
876                         write_unlock_bh(&idev->lock);
877                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
878                                 NULL, 0);
879                         in6_dev_put(idev);
880                         return 0;
881                 }
882         }
883 
884         mc = mca_alloc(idev, addr);
885         if (!mc) {
886                 write_unlock_bh(&idev->lock);
887                 in6_dev_put(idev);
888                 return -ENOMEM;
889         }
890 
891         mc->next = idev->mc_list;
892         idev->mc_list = mc;
893 
894         /* Hold this for the code below before we unlock,
895          * it is already exposed via idev->mc_list.
896          */
897         mca_get(mc);
898         write_unlock_bh(&idev->lock);
899 
900         mld_del_delrec(idev, &mc->mca_addr);
901         igmp6_group_added(mc);
902         ma_put(mc);
903         return 0;
904 }
905 
906 /*
907  *      device multicast group del
908  */
909 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
910 {
911         struct ifmcaddr6 *ma, **map;
912 
913         ASSERT_RTNL();
914 
915         write_lock_bh(&idev->lock);
916         for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
917                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
918                         if (--ma->mca_users == 0) {
919                                 *map = ma->next;
920                                 write_unlock_bh(&idev->lock);
921 
922                                 igmp6_group_dropped(ma);
923 
924                                 ma_put(ma);
925                                 return 0;
926                         }
927                         write_unlock_bh(&idev->lock);
928                         return 0;
929                 }
930         }
931         write_unlock_bh(&idev->lock);
932 
933         return -ENOENT;
934 }
935 
936 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
937 {
938         struct inet6_dev *idev;
939         int err;
940 
941         ASSERT_RTNL();
942 
943         idev = __in6_dev_get(dev);
944         if (!idev)
945                 err = -ENODEV;
946         else
947                 err = __ipv6_dev_mc_dec(idev, addr);
948 
949         return err;
950 }
951 
952 /*
953  *      check if the interface/address pair is valid
954  */
955 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
956                          const struct in6_addr *src_addr)
957 {
958         struct inet6_dev *idev;
959         struct ifmcaddr6 *mc;
960         bool rv = false;
961 
962         rcu_read_lock();
963         idev = __in6_dev_get(dev);
964         if (idev) {
965                 read_lock_bh(&idev->lock);
966                 for (mc = idev->mc_list; mc; mc = mc->next) {
967                         if (ipv6_addr_equal(&mc->mca_addr, group))
968                                 break;
969                 }
970                 if (mc) {
971                         if (src_addr && !ipv6_addr_any(src_addr)) {
972                                 struct ip6_sf_list *psf;
973 
974                                 spin_lock_bh(&mc->mca_lock);
975                                 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
976                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
977                                                 break;
978                                 }
979                                 if (psf)
980                                         rv = psf->sf_count[MCAST_INCLUDE] ||
981                                                 psf->sf_count[MCAST_EXCLUDE] !=
982                                                 mc->mca_sfcount[MCAST_EXCLUDE];
983                                 else
984                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
985                                 spin_unlock_bh(&mc->mca_lock);
986                         } else
987                                 rv = true; /* don't filter unspecified source */
988                 }
989                 read_unlock_bh(&idev->lock);
990         }
991         rcu_read_unlock();
992         return rv;
993 }
994 
995 static void mld_gq_start_timer(struct inet6_dev *idev)
996 {
997         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
998 
999         idev->mc_gq_running = 1;
1000         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1001                 in6_dev_hold(idev);
1002 }
1003 
1004 static void mld_gq_stop_timer(struct inet6_dev *idev)
1005 {
1006         idev->mc_gq_running = 0;
1007         if (del_timer(&idev->mc_gq_timer))
1008                 __in6_dev_put(idev);
1009 }
1010 
1011 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1012 {
1013         unsigned long tv = prandom_u32() % delay;
1014 
1015         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1016                 in6_dev_hold(idev);
1017 }
1018 
1019 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1020 {
1021         idev->mc_ifc_count = 0;
1022         if (del_timer(&idev->mc_ifc_timer))
1023                 __in6_dev_put(idev);
1024 }
1025 
1026 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1027 {
1028         unsigned long tv = prandom_u32() % delay;
1029 
1030         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1031                 in6_dev_hold(idev);
1032 }
1033 
1034 static void mld_dad_stop_timer(struct inet6_dev *idev)
1035 {
1036         if (del_timer(&idev->mc_dad_timer))
1037                 __in6_dev_put(idev);
1038 }
1039 
1040 /*
1041  *      IGMP handling (alias multicast ICMPv6 messages)
1042  */
1043 
1044 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1045 {
1046         unsigned long delay = resptime;
1047 
1048         /* Do not start timer for these addresses */
1049         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1050             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1051                 return;
1052 
1053         if (del_timer(&ma->mca_timer)) {
1054                 atomic_dec(&ma->mca_refcnt);
1055                 delay = ma->mca_timer.expires - jiffies;
1056         }
1057 
1058         if (delay >= resptime)
1059                 delay = prandom_u32() % resptime;
1060 
1061         ma->mca_timer.expires = jiffies + delay;
1062         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1063                 atomic_inc(&ma->mca_refcnt);
1064         ma->mca_flags |= MAF_TIMER_RUNNING;
1065 }
1066 
1067 /* mark EXCLUDE-mode sources */
1068 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1069                              const struct in6_addr *srcs)
1070 {
1071         struct ip6_sf_list *psf;
1072         int i, scount;
1073 
1074         scount = 0;
1075         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1076                 if (scount == nsrcs)
1077                         break;
1078                 for (i = 0; i < nsrcs; i++) {
1079                         /* skip inactive filters */
1080                         if (psf->sf_count[MCAST_INCLUDE] ||
1081                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1082                             psf->sf_count[MCAST_EXCLUDE])
1083                                 break;
1084                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1085                                 scount++;
1086                                 break;
1087                         }
1088                 }
1089         }
1090         pmc->mca_flags &= ~MAF_GSQUERY;
1091         if (scount == nsrcs)    /* all sources excluded */
1092                 return false;
1093         return true;
1094 }
1095 
1096 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1097                             const struct in6_addr *srcs)
1098 {
1099         struct ip6_sf_list *psf;
1100         int i, scount;
1101 
1102         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1103                 return mld_xmarksources(pmc, nsrcs, srcs);
1104 
1105         /* mark INCLUDE-mode sources */
1106 
1107         scount = 0;
1108         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1109                 if (scount == nsrcs)
1110                         break;
1111                 for (i = 0; i < nsrcs; i++) {
1112                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1113                                 psf->sf_gsresp = 1;
1114                                 scount++;
1115                                 break;
1116                         }
1117                 }
1118         }
1119         if (!scount) {
1120                 pmc->mca_flags &= ~MAF_GSQUERY;
1121                 return false;
1122         }
1123         pmc->mca_flags |= MAF_GSQUERY;
1124         return true;
1125 }
1126 
1127 static int mld_force_mld_version(const struct inet6_dev *idev)
1128 {
1129         /* Normally, both are 0 here. If enforcement to a particular is
1130          * being used, individual device enforcement will have a lower
1131          * precedence over 'all' device (.../conf/all/force_mld_version).
1132          */
1133 
1134         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1135                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1136         else
1137                 return idev->cnf.force_mld_version;
1138 }
1139 
1140 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1141 {
1142         return mld_force_mld_version(idev) == 2;
1143 }
1144 
1145 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1146 {
1147         return mld_force_mld_version(idev) == 1;
1148 }
1149 
1150 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1151 {
1152         if (mld_in_v2_mode_only(idev))
1153                 return false;
1154         if (mld_in_v1_mode_only(idev))
1155                 return true;
1156         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1157                 return true;
1158 
1159         return false;
1160 }
1161 
1162 static void mld_set_v1_mode(struct inet6_dev *idev)
1163 {
1164         /* RFC3810, relevant sections:
1165          *  - 9.1. Robustness Variable
1166          *  - 9.2. Query Interval
1167          *  - 9.3. Query Response Interval
1168          *  - 9.12. Older Version Querier Present Timeout
1169          */
1170         unsigned long switchback;
1171 
1172         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1173 
1174         idev->mc_v1_seen = jiffies + switchback;
1175 }
1176 
1177 static void mld_update_qrv(struct inet6_dev *idev,
1178                            const struct mld2_query *mlh2)
1179 {
1180         /* RFC3810, relevant sections:
1181          *  - 5.1.8. QRV (Querier's Robustness Variable)
1182          *  - 9.1. Robustness Variable
1183          */
1184 
1185         /* The value of the Robustness Variable MUST NOT be zero,
1186          * and SHOULD NOT be one. Catch this here if we ever run
1187          * into such a case in future.
1188          */
1189         const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1190         WARN_ON(idev->mc_qrv == 0);
1191 
1192         if (mlh2->mld2q_qrv > 0)
1193                 idev->mc_qrv = mlh2->mld2q_qrv;
1194 
1195         if (unlikely(idev->mc_qrv < min_qrv)) {
1196                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1197                                      idev->mc_qrv, min_qrv);
1198                 idev->mc_qrv = min_qrv;
1199         }
1200 }
1201 
1202 static void mld_update_qi(struct inet6_dev *idev,
1203                           const struct mld2_query *mlh2)
1204 {
1205         /* RFC3810, relevant sections:
1206          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1207          *  - 9.2. Query Interval
1208          *  - 9.12. Older Version Querier Present Timeout
1209          *    (the [Query Interval] in the last Query received)
1210          */
1211         unsigned long mc_qqi;
1212 
1213         if (mlh2->mld2q_qqic < 128) {
1214                 mc_qqi = mlh2->mld2q_qqic;
1215         } else {
1216                 unsigned long mc_man, mc_exp;
1217 
1218                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1219                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1220 
1221                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1222         }
1223 
1224         idev->mc_qi = mc_qqi * HZ;
1225 }
1226 
1227 static void mld_update_qri(struct inet6_dev *idev,
1228                            const struct mld2_query *mlh2)
1229 {
1230         /* RFC3810, relevant sections:
1231          *  - 5.1.3. Maximum Response Code
1232          *  - 9.3. Query Response Interval
1233          */
1234         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1235 }
1236 
1237 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1238                           unsigned long *max_delay, bool v1_query)
1239 {
1240         unsigned long mldv1_md;
1241 
1242         /* Ignore v1 queries */
1243         if (mld_in_v2_mode_only(idev))
1244                 return -EINVAL;
1245 
1246         mldv1_md = ntohs(mld->mld_maxdelay);
1247 
1248         /* When in MLDv1 fallback and a MLDv2 router start-up being
1249          * unaware of current MLDv1 operation, the MRC == MRD mapping
1250          * only works when the exponential algorithm is not being
1251          * used (as MLDv1 is unaware of such things).
1252          *
1253          * According to the RFC author, the MLDv2 implementations
1254          * he's aware of all use a MRC < 32768 on start up queries.
1255          *
1256          * Thus, should we *ever* encounter something else larger
1257          * than that, just assume the maximum possible within our
1258          * reach.
1259          */
1260         if (!v1_query)
1261                 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1262 
1263         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1264 
1265         /* MLDv1 router present: we need to go into v1 mode *only*
1266          * when an MLDv1 query is received as per section 9.12. of
1267          * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1268          * queries MUST be of exactly 24 octets.
1269          */
1270         if (v1_query)
1271                 mld_set_v1_mode(idev);
1272 
1273         /* cancel MLDv2 report timer */
1274         mld_gq_stop_timer(idev);
1275         /* cancel the interface change timer */
1276         mld_ifc_stop_timer(idev);
1277         /* clear deleted report items */
1278         mld_clear_delrec(idev);
1279 
1280         return 0;
1281 }
1282 
1283 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1284                           unsigned long *max_delay)
1285 {
1286         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1287 
1288         mld_update_qrv(idev, mld);
1289         mld_update_qi(idev, mld);
1290         mld_update_qri(idev, mld);
1291 
1292         idev->mc_maxdelay = *max_delay;
1293 
1294         return 0;
1295 }
1296 
1297 /* called with rcu_read_lock() */
1298 int igmp6_event_query(struct sk_buff *skb)
1299 {
1300         struct mld2_query *mlh2 = NULL;
1301         struct ifmcaddr6 *ma;
1302         const struct in6_addr *group;
1303         unsigned long max_delay;
1304         struct inet6_dev *idev;
1305         struct mld_msg *mld;
1306         int group_type;
1307         int mark = 0;
1308         int len, err;
1309 
1310         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1311                 return -EINVAL;
1312 
1313         /* compute payload length excluding extension headers */
1314         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1315         len -= skb_network_header_len(skb);
1316 
1317         /* RFC3810 6.2
1318          * Upon reception of an MLD message that contains a Query, the node
1319          * checks if the source address of the message is a valid link-local
1320          * address, if the Hop Limit is set to 1, and if the Router Alert
1321          * option is present in the Hop-By-Hop Options header of the IPv6
1322          * packet.  If any of these checks fails, the packet is dropped.
1323          */
1324         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1325             ipv6_hdr(skb)->hop_limit != 1 ||
1326             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1327             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1328                 return -EINVAL;
1329 
1330         idev = __in6_dev_get(skb->dev);
1331         if (!idev)
1332                 return 0;
1333 
1334         mld = (struct mld_msg *)icmp6_hdr(skb);
1335         group = &mld->mld_mca;
1336         group_type = ipv6_addr_type(group);
1337 
1338         if (group_type != IPV6_ADDR_ANY &&
1339             !(group_type&IPV6_ADDR_MULTICAST))
1340                 return -EINVAL;
1341 
1342         if (len < MLD_V1_QUERY_LEN) {
1343                 return -EINVAL;
1344         } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1345                 err = mld_process_v1(idev, mld, &max_delay,
1346                                      len == MLD_V1_QUERY_LEN);
1347                 if (err < 0)
1348                         return err;
1349         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1350                 int srcs_offset = sizeof(struct mld2_query) -
1351                                   sizeof(struct icmp6hdr);
1352 
1353                 if (!pskb_may_pull(skb, srcs_offset))
1354                         return -EINVAL;
1355 
1356                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1357 
1358                 err = mld_process_v2(idev, mlh2, &max_delay);
1359                 if (err < 0)
1360                         return err;
1361 
1362                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1363                         if (mlh2->mld2q_nsrcs)
1364                                 return -EINVAL; /* no sources allowed */
1365 
1366                         mld_gq_start_timer(idev);
1367                         return 0;
1368                 }
1369                 /* mark sources to include, if group & source-specific */
1370                 if (mlh2->mld2q_nsrcs != 0) {
1371                         if (!pskb_may_pull(skb, srcs_offset +
1372                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1373                                 return -EINVAL;
1374 
1375                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1376                         mark = 1;
1377                 }
1378         } else {
1379                 return -EINVAL;
1380         }
1381 
1382         read_lock_bh(&idev->lock);
1383         if (group_type == IPV6_ADDR_ANY) {
1384                 for (ma = idev->mc_list; ma; ma = ma->next) {
1385                         spin_lock_bh(&ma->mca_lock);
1386                         igmp6_group_queried(ma, max_delay);
1387                         spin_unlock_bh(&ma->mca_lock);
1388                 }
1389         } else {
1390                 for (ma = idev->mc_list; ma; ma = ma->next) {
1391                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1392                                 continue;
1393                         spin_lock_bh(&ma->mca_lock);
1394                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1395                                 /* gsquery <- gsquery && mark */
1396                                 if (!mark)
1397                                         ma->mca_flags &= ~MAF_GSQUERY;
1398                         } else {
1399                                 /* gsquery <- mark */
1400                                 if (mark)
1401                                         ma->mca_flags |= MAF_GSQUERY;
1402                                 else
1403                                         ma->mca_flags &= ~MAF_GSQUERY;
1404                         }
1405                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1406                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1407                                 igmp6_group_queried(ma, max_delay);
1408                         spin_unlock_bh(&ma->mca_lock);
1409                         break;
1410                 }
1411         }
1412         read_unlock_bh(&idev->lock);
1413 
1414         return 0;
1415 }
1416 
1417 /* called with rcu_read_lock() */
1418 int igmp6_event_report(struct sk_buff *skb)
1419 {
1420         struct ifmcaddr6 *ma;
1421         struct inet6_dev *idev;
1422         struct mld_msg *mld;
1423         int addr_type;
1424 
1425         /* Our own report looped back. Ignore it. */
1426         if (skb->pkt_type == PACKET_LOOPBACK)
1427                 return 0;
1428 
1429         /* send our report if the MC router may not have heard this report */
1430         if (skb->pkt_type != PACKET_MULTICAST &&
1431             skb->pkt_type != PACKET_BROADCAST)
1432                 return 0;
1433 
1434         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1435                 return -EINVAL;
1436 
1437         mld = (struct mld_msg *)icmp6_hdr(skb);
1438 
1439         /* Drop reports with not link local source */
1440         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1441         if (addr_type != IPV6_ADDR_ANY &&
1442             !(addr_type&IPV6_ADDR_LINKLOCAL))
1443                 return -EINVAL;
1444 
1445         idev = __in6_dev_get(skb->dev);
1446         if (!idev)
1447                 return -ENODEV;
1448 
1449         /*
1450          *      Cancel the timer for this group
1451          */
1452 
1453         read_lock_bh(&idev->lock);
1454         for (ma = idev->mc_list; ma; ma = ma->next) {
1455                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1456                         spin_lock(&ma->mca_lock);
1457                         if (del_timer(&ma->mca_timer))
1458                                 atomic_dec(&ma->mca_refcnt);
1459                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1460                         spin_unlock(&ma->mca_lock);
1461                         break;
1462                 }
1463         }
1464         read_unlock_bh(&idev->lock);
1465         return 0;
1466 }
1467 
1468 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1469                   int gdeleted, int sdeleted)
1470 {
1471         switch (type) {
1472         case MLD2_MODE_IS_INCLUDE:
1473         case MLD2_MODE_IS_EXCLUDE:
1474                 if (gdeleted || sdeleted)
1475                         return false;
1476                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1477                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1478                                 return true;
1479                         /* don't include if this source is excluded
1480                          * in all filters
1481                          */
1482                         if (psf->sf_count[MCAST_INCLUDE])
1483                                 return type == MLD2_MODE_IS_INCLUDE;
1484                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1485                                 psf->sf_count[MCAST_EXCLUDE];
1486                 }
1487                 return false;
1488         case MLD2_CHANGE_TO_INCLUDE:
1489                 if (gdeleted || sdeleted)
1490                         return false;
1491                 return psf->sf_count[MCAST_INCLUDE] != 0;
1492         case MLD2_CHANGE_TO_EXCLUDE:
1493                 if (gdeleted || sdeleted)
1494                         return false;
1495                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1496                     psf->sf_count[MCAST_INCLUDE])
1497                         return false;
1498                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1499                         psf->sf_count[MCAST_EXCLUDE];
1500         case MLD2_ALLOW_NEW_SOURCES:
1501                 if (gdeleted || !psf->sf_crcount)
1502                         return false;
1503                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1504         case MLD2_BLOCK_OLD_SOURCES:
1505                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1506                         return gdeleted || (psf->sf_crcount && sdeleted);
1507                 return psf->sf_crcount && !gdeleted && !sdeleted;
1508         }
1509         return false;
1510 }
1511 
1512 static int
1513 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1514 {
1515         struct ip6_sf_list *psf;
1516         int scount = 0;
1517 
1518         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1519                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1520                         continue;
1521                 scount++;
1522         }
1523         return scount;
1524 }
1525 
1526 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1527                        struct net_device *dev,
1528                        const struct in6_addr *saddr,
1529                        const struct in6_addr *daddr,
1530                        int proto, int len)
1531 {
1532         struct ipv6hdr *hdr;
1533 
1534         skb->protocol = htons(ETH_P_IPV6);
1535         skb->dev = dev;
1536 
1537         skb_reset_network_header(skb);
1538         skb_put(skb, sizeof(struct ipv6hdr));
1539         hdr = ipv6_hdr(skb);
1540 
1541         ip6_flow_hdr(hdr, 0, 0);
1542 
1543         hdr->payload_len = htons(len);
1544         hdr->nexthdr = proto;
1545         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1546 
1547         hdr->saddr = *saddr;
1548         hdr->daddr = *daddr;
1549 }
1550 
1551 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1552 {
1553         struct net_device *dev = idev->dev;
1554         struct net *net = dev_net(dev);
1555         struct sock *sk = net->ipv6.igmp_sk;
1556         struct sk_buff *skb;
1557         struct mld2_report *pmr;
1558         struct in6_addr addr_buf;
1559         const struct in6_addr *saddr;
1560         int hlen = LL_RESERVED_SPACE(dev);
1561         int tlen = dev->needed_tailroom;
1562         unsigned int size = mtu + hlen + tlen;
1563         int err;
1564         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1565                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1566                      IPV6_TLV_PADN, 0 };
1567 
1568         /* we assume size > sizeof(ra) here */
1569         /* limit our allocations to order-0 page */
1570         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1571         skb = sock_alloc_send_skb(sk, size, 1, &err);
1572 
1573         if (!skb)
1574                 return NULL;
1575 
1576         skb->priority = TC_PRIO_CONTROL;
1577         skb_reserve(skb, hlen);
1578         skb_tailroom_reserve(skb, mtu, tlen);
1579 
1580         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1581                 /* <draft-ietf-magma-mld-source-05.txt>:
1582                  * use unspecified address as the source address
1583                  * when a valid link-local address is not available.
1584                  */
1585                 saddr = &in6addr_any;
1586         } else
1587                 saddr = &addr_buf;
1588 
1589         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1590 
1591         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1592 
1593         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1594         skb_put(skb, sizeof(*pmr));
1595         pmr = (struct mld2_report *)skb_transport_header(skb);
1596         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1597         pmr->mld2r_resv1 = 0;
1598         pmr->mld2r_cksum = 0;
1599         pmr->mld2r_resv2 = 0;
1600         pmr->mld2r_ngrec = 0;
1601         return skb;
1602 }
1603 
1604 static void mld_sendpack(struct sk_buff *skb)
1605 {
1606         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1607         struct mld2_report *pmr =
1608                               (struct mld2_report *)skb_transport_header(skb);
1609         int payload_len, mldlen;
1610         struct inet6_dev *idev;
1611         struct net *net = dev_net(skb->dev);
1612         int err;
1613         struct flowi6 fl6;
1614         struct dst_entry *dst;
1615 
1616         rcu_read_lock();
1617         idev = __in6_dev_get(skb->dev);
1618         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1619 
1620         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1621                 sizeof(*pip6);
1622         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1623         pip6->payload_len = htons(payload_len);
1624 
1625         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1626                                            IPPROTO_ICMPV6,
1627                                            csum_partial(skb_transport_header(skb),
1628                                                         mldlen, 0));
1629 
1630         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1631                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1632                          skb->dev->ifindex);
1633         dst = icmp6_dst_alloc(skb->dev, &fl6);
1634 
1635         err = 0;
1636         if (IS_ERR(dst)) {
1637                 err = PTR_ERR(dst);
1638                 dst = NULL;
1639         }
1640         skb_dst_set(skb, dst);
1641         if (err)
1642                 goto err_out;
1643 
1644         payload_len = skb->len;
1645 
1646         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1647                       net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1648                       dst_output);
1649 out:
1650         if (!err) {
1651                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1652                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1653         } else {
1654                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1655         }
1656 
1657         rcu_read_unlock();
1658         return;
1659 
1660 err_out:
1661         kfree_skb(skb);
1662         goto out;
1663 }
1664 
1665 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1666 {
1667         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1668 }
1669 
1670 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1671         int type, struct mld2_grec **ppgr)
1672 {
1673         struct net_device *dev = pmc->idev->dev;
1674         struct mld2_report *pmr;
1675         struct mld2_grec *pgr;
1676 
1677         if (!skb)
1678                 skb = mld_newpack(pmc->idev, dev->mtu);
1679         if (!skb)
1680                 return NULL;
1681         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1682         pgr->grec_type = type;
1683         pgr->grec_auxwords = 0;
1684         pgr->grec_nsrcs = 0;
1685         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1686         pmr = (struct mld2_report *)skb_transport_header(skb);
1687         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1688         *ppgr = pgr;
1689         return skb;
1690 }
1691 
1692 #define AVAILABLE(skb)  ((skb) ? skb_availroom(skb) : 0)
1693 
1694 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1695         int type, int gdeleted, int sdeleted, int crsend)
1696 {
1697         struct inet6_dev *idev = pmc->idev;
1698         struct net_device *dev = idev->dev;
1699         struct mld2_report *pmr;
1700         struct mld2_grec *pgr = NULL;
1701         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1702         int scount, stotal, first, isquery, truncate;
1703 
1704         if (pmc->mca_flags & MAF_NOREPORT)
1705                 return skb;
1706 
1707         isquery = type == MLD2_MODE_IS_INCLUDE ||
1708                   type == MLD2_MODE_IS_EXCLUDE;
1709         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1710                     type == MLD2_CHANGE_TO_EXCLUDE;
1711 
1712         stotal = scount = 0;
1713 
1714         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1715 
1716         if (!*psf_list)
1717                 goto empty_source;
1718 
1719         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1720 
1721         /* EX and TO_EX get a fresh packet, if needed */
1722         if (truncate) {
1723                 if (pmr && pmr->mld2r_ngrec &&
1724                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1725                         if (skb)
1726                                 mld_sendpack(skb);
1727                         skb = mld_newpack(idev, dev->mtu);
1728                 }
1729         }
1730         first = 1;
1731         psf_prev = NULL;
1732         for (psf = *psf_list; psf; psf = psf_next) {
1733                 struct in6_addr *psrc;
1734 
1735                 psf_next = psf->sf_next;
1736 
1737                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1738                         psf_prev = psf;
1739                         continue;
1740                 }
1741 
1742                 /* clear marks on query responses */
1743                 if (isquery)
1744                         psf->sf_gsresp = 0;
1745 
1746                 if (AVAILABLE(skb) < sizeof(*psrc) +
1747                     first*sizeof(struct mld2_grec)) {
1748                         if (truncate && !first)
1749                                 break;   /* truncate these */
1750                         if (pgr)
1751                                 pgr->grec_nsrcs = htons(scount);
1752                         if (skb)
1753                                 mld_sendpack(skb);
1754                         skb = mld_newpack(idev, dev->mtu);
1755                         first = 1;
1756                         scount = 0;
1757                 }
1758                 if (first) {
1759                         skb = add_grhead(skb, pmc, type, &pgr);
1760                         first = 0;
1761                 }
1762                 if (!skb)
1763                         return NULL;
1764                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1765                 *psrc = psf->sf_addr;
1766                 scount++; stotal++;
1767                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1768                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1769                         psf->sf_crcount--;
1770                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1771                                 if (psf_prev)
1772                                         psf_prev->sf_next = psf->sf_next;
1773                                 else
1774                                         *psf_list = psf->sf_next;
1775                                 kfree(psf);
1776                                 continue;
1777                         }
1778                 }
1779                 psf_prev = psf;
1780         }
1781 
1782 empty_source:
1783         if (!stotal) {
1784                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1785                     type == MLD2_BLOCK_OLD_SOURCES)
1786                         return skb;
1787                 if (pmc->mca_crcount || isquery || crsend) {
1788                         /* make sure we have room for group header */
1789                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1790                                 mld_sendpack(skb);
1791                                 skb = NULL; /* add_grhead will get a new one */
1792                         }
1793                         skb = add_grhead(skb, pmc, type, &pgr);
1794                 }
1795         }
1796         if (pgr)
1797                 pgr->grec_nsrcs = htons(scount);
1798 
1799         if (isquery)
1800                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1801         return skb;
1802 }
1803 
1804 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1805 {
1806         struct sk_buff *skb = NULL;
1807         int type;
1808 
1809         read_lock_bh(&idev->lock);
1810         if (!pmc) {
1811                 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1812                         if (pmc->mca_flags & MAF_NOREPORT)
1813                                 continue;
1814                         spin_lock_bh(&pmc->mca_lock);
1815                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1816                                 type = MLD2_MODE_IS_EXCLUDE;
1817                         else
1818                                 type = MLD2_MODE_IS_INCLUDE;
1819                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1820                         spin_unlock_bh(&pmc->mca_lock);
1821                 }
1822         } else {
1823                 spin_lock_bh(&pmc->mca_lock);
1824                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1825                         type = MLD2_MODE_IS_EXCLUDE;
1826                 else
1827                         type = MLD2_MODE_IS_INCLUDE;
1828                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1829                 spin_unlock_bh(&pmc->mca_lock);
1830         }
1831         read_unlock_bh(&idev->lock);
1832         if (skb)
1833                 mld_sendpack(skb);
1834 }
1835 
1836 /*
1837  * remove zero-count source records from a source filter list
1838  */
1839 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1840 {
1841         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1842 
1843         psf_prev = NULL;
1844         for (psf = *ppsf; psf; psf = psf_next) {
1845                 psf_next = psf->sf_next;
1846                 if (psf->sf_crcount == 0) {
1847                         if (psf_prev)
1848                                 psf_prev->sf_next = psf->sf_next;
1849                         else
1850                                 *ppsf = psf->sf_next;
1851                         kfree(psf);
1852                 } else
1853                         psf_prev = psf;
1854         }
1855 }
1856 
1857 static void mld_send_cr(struct inet6_dev *idev)
1858 {
1859         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1860         struct sk_buff *skb = NULL;
1861         int type, dtype;
1862 
1863         read_lock_bh(&idev->lock);
1864         spin_lock(&idev->mc_lock);
1865 
1866         /* deleted MCA's */
1867         pmc_prev = NULL;
1868         for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1869                 pmc_next = pmc->next;
1870                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1871                         type = MLD2_BLOCK_OLD_SOURCES;
1872                         dtype = MLD2_BLOCK_OLD_SOURCES;
1873                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1874                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1875                 }
1876                 if (pmc->mca_crcount) {
1877                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1878                                 type = MLD2_CHANGE_TO_INCLUDE;
1879                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1880                         }
1881                         pmc->mca_crcount--;
1882                         if (pmc->mca_crcount == 0) {
1883                                 mld_clear_zeros(&pmc->mca_tomb);
1884                                 mld_clear_zeros(&pmc->mca_sources);
1885                         }
1886                 }
1887                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1888                     !pmc->mca_sources) {
1889                         if (pmc_prev)
1890                                 pmc_prev->next = pmc_next;
1891                         else
1892                                 idev->mc_tomb = pmc_next;
1893                         in6_dev_put(pmc->idev);
1894                         kfree(pmc);
1895                 } else
1896                         pmc_prev = pmc;
1897         }
1898         spin_unlock(&idev->mc_lock);
1899 
1900         /* change recs */
1901         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1902                 spin_lock_bh(&pmc->mca_lock);
1903                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1904                         type = MLD2_BLOCK_OLD_SOURCES;
1905                         dtype = MLD2_ALLOW_NEW_SOURCES;
1906                 } else {
1907                         type = MLD2_ALLOW_NEW_SOURCES;
1908                         dtype = MLD2_BLOCK_OLD_SOURCES;
1909                 }
1910                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1911                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1912 
1913                 /* filter mode changes */
1914                 if (pmc->mca_crcount) {
1915                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1916                                 type = MLD2_CHANGE_TO_EXCLUDE;
1917                         else
1918                                 type = MLD2_CHANGE_TO_INCLUDE;
1919                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1920                         pmc->mca_crcount--;
1921                 }
1922                 spin_unlock_bh(&pmc->mca_lock);
1923         }
1924         read_unlock_bh(&idev->lock);
1925         if (!skb)
1926                 return;
1927         (void) mld_sendpack(skb);
1928 }
1929 
1930 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1931 {
1932         struct net *net = dev_net(dev);
1933         struct sock *sk = net->ipv6.igmp_sk;
1934         struct inet6_dev *idev;
1935         struct sk_buff *skb;
1936         struct mld_msg *hdr;
1937         const struct in6_addr *snd_addr, *saddr;
1938         struct in6_addr addr_buf;
1939         int hlen = LL_RESERVED_SPACE(dev);
1940         int tlen = dev->needed_tailroom;
1941         int err, len, payload_len, full_len;
1942         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1943                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1944                      IPV6_TLV_PADN, 0 };
1945         struct flowi6 fl6;
1946         struct dst_entry *dst;
1947 
1948         if (type == ICMPV6_MGM_REDUCTION)
1949                 snd_addr = &in6addr_linklocal_allrouters;
1950         else
1951                 snd_addr = addr;
1952 
1953         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1954         payload_len = len + sizeof(ra);
1955         full_len = sizeof(struct ipv6hdr) + payload_len;
1956 
1957         rcu_read_lock();
1958         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1959                       IPSTATS_MIB_OUT, full_len);
1960         rcu_read_unlock();
1961 
1962         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1963 
1964         if (!skb) {
1965                 rcu_read_lock();
1966                 IP6_INC_STATS(net, __in6_dev_get(dev),
1967                               IPSTATS_MIB_OUTDISCARDS);
1968                 rcu_read_unlock();
1969                 return;
1970         }
1971         skb->priority = TC_PRIO_CONTROL;
1972         skb_reserve(skb, hlen);
1973 
1974         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1975                 /* <draft-ietf-magma-mld-source-05.txt>:
1976                  * use unspecified address as the source address
1977                  * when a valid link-local address is not available.
1978                  */
1979                 saddr = &in6addr_any;
1980         } else
1981                 saddr = &addr_buf;
1982 
1983         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1984 
1985         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1986 
1987         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1988         memset(hdr, 0, sizeof(struct mld_msg));
1989         hdr->mld_type = type;
1990         hdr->mld_mca = *addr;
1991 
1992         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1993                                          IPPROTO_ICMPV6,
1994                                          csum_partial(hdr, len, 0));
1995 
1996         rcu_read_lock();
1997         idev = __in6_dev_get(skb->dev);
1998 
1999         icmpv6_flow_init(sk, &fl6, type,
2000                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2001                          skb->dev->ifindex);
2002         dst = icmp6_dst_alloc(skb->dev, &fl6);
2003         if (IS_ERR(dst)) {
2004                 err = PTR_ERR(dst);
2005                 goto err_out;
2006         }
2007 
2008         skb_dst_set(skb, dst);
2009         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2010                       net, sk, skb, NULL, skb->dev,
2011                       dst_output);
2012 out:
2013         if (!err) {
2014                 ICMP6MSGOUT_INC_STATS(net, idev, type);
2015                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2016         } else
2017                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2018 
2019         rcu_read_unlock();
2020         return;
2021 
2022 err_out:
2023         kfree_skb(skb);
2024         goto out;
2025 }
2026 
2027 static void mld_send_initial_cr(struct inet6_dev *idev)
2028 {
2029         struct sk_buff *skb;
2030         struct ifmcaddr6 *pmc;
2031         int type;
2032 
2033         if (mld_in_v1_mode(idev))
2034                 return;
2035 
2036         skb = NULL;
2037         read_lock_bh(&idev->lock);
2038         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2039                 spin_lock_bh(&pmc->mca_lock);
2040                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2041                         type = MLD2_CHANGE_TO_EXCLUDE;
2042                 else
2043                         type = MLD2_CHANGE_TO_INCLUDE;
2044                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2045                 spin_unlock_bh(&pmc->mca_lock);
2046         }
2047         read_unlock_bh(&idev->lock);
2048         if (skb)
2049                 mld_sendpack(skb);
2050 }
2051 
2052 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2053 {
2054         idev->mc_dad_count = idev->mc_qrv;
2055         if (idev->mc_dad_count) {
2056                 mld_send_initial_cr(idev);
2057                 idev->mc_dad_count--;
2058                 if (idev->mc_dad_count)
2059                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2060         }
2061 }
2062 
2063 static void mld_dad_timer_expire(unsigned long data)
2064 {
2065         struct inet6_dev *idev = (struct inet6_dev *)data;
2066 
2067         mld_send_initial_cr(idev);
2068         if (idev->mc_dad_count) {
2069                 idev->mc_dad_count--;
2070                 if (idev->mc_dad_count)
2071                         mld_dad_start_timer(idev, idev->mc_maxdelay);
2072         }
2073         in6_dev_put(idev);
2074 }
2075 
2076 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2077         const struct in6_addr *psfsrc)
2078 {
2079         struct ip6_sf_list *psf, *psf_prev;
2080         int rv = 0;
2081 
2082         psf_prev = NULL;
2083         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2084                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2085                         break;
2086                 psf_prev = psf;
2087         }
2088         if (!psf || psf->sf_count[sfmode] == 0) {
2089                 /* source filter not found, or count wrong =>  bug */
2090                 return -ESRCH;
2091         }
2092         psf->sf_count[sfmode]--;
2093         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2094                 struct inet6_dev *idev = pmc->idev;
2095 
2096                 /* no more filters for this source */
2097                 if (psf_prev)
2098                         psf_prev->sf_next = psf->sf_next;
2099                 else
2100                         pmc->mca_sources = psf->sf_next;
2101                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2102                     !mld_in_v1_mode(idev)) {
2103                         psf->sf_crcount = idev->mc_qrv;
2104                         psf->sf_next = pmc->mca_tomb;
2105                         pmc->mca_tomb = psf;
2106                         rv = 1;
2107                 } else
2108                         kfree(psf);
2109         }
2110         return rv;
2111 }
2112 
2113 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2114                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2115                           int delta)
2116 {
2117         struct ifmcaddr6 *pmc;
2118         int     changerec = 0;
2119         int     i, err;
2120 
2121         if (!idev)
2122                 return -ENODEV;
2123         read_lock_bh(&idev->lock);
2124         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2125                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2126                         break;
2127         }
2128         if (!pmc) {
2129                 /* MCA not found?? bug */
2130                 read_unlock_bh(&idev->lock);
2131                 return -ESRCH;
2132         }
2133         spin_lock_bh(&pmc->mca_lock);
2134         sf_markstate(pmc);
2135         if (!delta) {
2136                 if (!pmc->mca_sfcount[sfmode]) {
2137                         spin_unlock_bh(&pmc->mca_lock);
2138                         read_unlock_bh(&idev->lock);
2139                         return -EINVAL;
2140                 }
2141                 pmc->mca_sfcount[sfmode]--;
2142         }
2143         err = 0;
2144         for (i = 0; i < sfcount; i++) {
2145                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2146 
2147                 changerec |= rv > 0;
2148                 if (!err && rv < 0)
2149                         err = rv;
2150         }
2151         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2152             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2153             pmc->mca_sfcount[MCAST_INCLUDE]) {
2154                 struct ip6_sf_list *psf;
2155 
2156                 /* filter mode change */
2157                 pmc->mca_sfmode = MCAST_INCLUDE;
2158                 pmc->mca_crcount = idev->mc_qrv;
2159                 idev->mc_ifc_count = pmc->mca_crcount;
2160                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2161                         psf->sf_crcount = 0;
2162                 mld_ifc_event(pmc->idev);
2163         } else if (sf_setstate(pmc) || changerec)
2164                 mld_ifc_event(pmc->idev);
2165         spin_unlock_bh(&pmc->mca_lock);
2166         read_unlock_bh(&idev->lock);
2167         return err;
2168 }
2169 
2170 /*
2171  * Add multicast single-source filter to the interface list
2172  */
2173 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2174         const struct in6_addr *psfsrc)
2175 {
2176         struct ip6_sf_list *psf, *psf_prev;
2177 
2178         psf_prev = NULL;
2179         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2180                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2181                         break;
2182                 psf_prev = psf;
2183         }
2184         if (!psf) {
2185                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2186                 if (!psf)
2187                         return -ENOBUFS;
2188 
2189                 psf->sf_addr = *psfsrc;
2190                 if (psf_prev) {
2191                         psf_prev->sf_next = psf;
2192                 } else
2193                         pmc->mca_sources = psf;
2194         }
2195         psf->sf_count[sfmode]++;
2196         return 0;
2197 }
2198 
2199 static void sf_markstate(struct ifmcaddr6 *pmc)
2200 {
2201         struct ip6_sf_list *psf;
2202         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2203 
2204         for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2205                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2206                         psf->sf_oldin = mca_xcount ==
2207                                 psf->sf_count[MCAST_EXCLUDE] &&
2208                                 !psf->sf_count[MCAST_INCLUDE];
2209                 } else
2210                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2211 }
2212 
2213 static int sf_setstate(struct ifmcaddr6 *pmc)
2214 {
2215         struct ip6_sf_list *psf, *dpsf;
2216         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2217         int qrv = pmc->idev->mc_qrv;
2218         int new_in, rv;
2219 
2220         rv = 0;
2221         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2222                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2223                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2224                                 !psf->sf_count[MCAST_INCLUDE];
2225                 } else
2226                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2227                 if (new_in) {
2228                         if (!psf->sf_oldin) {
2229                                 struct ip6_sf_list *prev = NULL;
2230 
2231                                 for (dpsf = pmc->mca_tomb; dpsf;
2232                                      dpsf = dpsf->sf_next) {
2233                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2234                                             &psf->sf_addr))
2235                                                 break;
2236                                         prev = dpsf;
2237                                 }
2238                                 if (dpsf) {
2239                                         if (prev)
2240                                                 prev->sf_next = dpsf->sf_next;
2241                                         else
2242                                                 pmc->mca_tomb = dpsf->sf_next;
2243                                         kfree(dpsf);
2244                                 }
2245                                 psf->sf_crcount = qrv;
2246                                 rv++;
2247                         }
2248                 } else if (psf->sf_oldin) {
2249                         psf->sf_crcount = 0;
2250                         /*
2251                          * add or update "delete" records if an active filter
2252                          * is now inactive
2253                          */
2254                         for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2255                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2256                                     &psf->sf_addr))
2257                                         break;
2258                         if (!dpsf) {
2259                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2260                                 if (!dpsf)
2261                                         continue;
2262                                 *dpsf = *psf;
2263                                 /* pmc->mca_lock held by callers */
2264                                 dpsf->sf_next = pmc->mca_tomb;
2265                                 pmc->mca_tomb = dpsf;
2266                         }
2267                         dpsf->sf_crcount = qrv;
2268                         rv++;
2269                 }
2270         }
2271         return rv;
2272 }
2273 
2274 /*
2275  * Add multicast source filter list to the interface list
2276  */
2277 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2278                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2279                           int delta)
2280 {
2281         struct ifmcaddr6 *pmc;
2282         int     isexclude;
2283         int     i, err;
2284 
2285         if (!idev)
2286                 return -ENODEV;
2287         read_lock_bh(&idev->lock);
2288         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2289                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2290                         break;
2291         }
2292         if (!pmc) {
2293                 /* MCA not found?? bug */
2294                 read_unlock_bh(&idev->lock);
2295                 return -ESRCH;
2296         }
2297         spin_lock_bh(&pmc->mca_lock);
2298 
2299         sf_markstate(pmc);
2300         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2301         if (!delta)
2302                 pmc->mca_sfcount[sfmode]++;
2303         err = 0;
2304         for (i = 0; i < sfcount; i++) {
2305                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2306                 if (err)
2307                         break;
2308         }
2309         if (err) {
2310                 int j;
2311 
2312                 if (!delta)
2313                         pmc->mca_sfcount[sfmode]--;
2314                 for (j = 0; j < i; j++)
2315                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2316         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2317                 struct ip6_sf_list *psf;
2318 
2319                 /* filter mode change */
2320                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2321                         pmc->mca_sfmode = MCAST_EXCLUDE;
2322                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2323                         pmc->mca_sfmode = MCAST_INCLUDE;
2324                 /* else no filters; keep old mode for reports */
2325 
2326                 pmc->mca_crcount = idev->mc_qrv;
2327                 idev->mc_ifc_count = pmc->mca_crcount;
2328                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2329                         psf->sf_crcount = 0;
2330                 mld_ifc_event(idev);
2331         } else if (sf_setstate(pmc))
2332                 mld_ifc_event(idev);
2333         spin_unlock_bh(&pmc->mca_lock);
2334         read_unlock_bh(&idev->lock);
2335         return err;
2336 }
2337 
2338 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2339 {
2340         struct ip6_sf_list *psf, *nextpsf;
2341 
2342         for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2343                 nextpsf = psf->sf_next;
2344                 kfree(psf);
2345         }
2346         pmc->mca_tomb = NULL;
2347         for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2348                 nextpsf = psf->sf_next;
2349                 kfree(psf);
2350         }
2351         pmc->mca_sources = NULL;
2352         pmc->mca_sfmode = MCAST_EXCLUDE;
2353         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2354         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2355 }
2356 
2357 
2358 static void igmp6_join_group(struct ifmcaddr6 *ma)
2359 {
2360         unsigned long delay;
2361 
2362         if (ma->mca_flags & MAF_NOREPORT)
2363                 return;
2364 
2365         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2366 
2367         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2368 
2369         spin_lock_bh(&ma->mca_lock);
2370         if (del_timer(&ma->mca_timer)) {
2371                 atomic_dec(&ma->mca_refcnt);
2372                 delay = ma->mca_timer.expires - jiffies;
2373         }
2374 
2375         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2376                 atomic_inc(&ma->mca_refcnt);
2377         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2378         spin_unlock_bh(&ma->mca_lock);
2379 }
2380 
2381 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2382                             struct inet6_dev *idev)
2383 {
2384         int err;
2385 
2386         /* callers have the socket lock and rtnl lock
2387          * so no other readers or writers of iml or its sflist
2388          */
2389         if (!iml->sflist) {
2390                 /* any-source empty exclude case */
2391                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2392         }
2393         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2394                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2395         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2396         iml->sflist = NULL;
2397         return err;
2398 }
2399 
2400 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2401 {
2402         if (mld_in_v1_mode(ma->idev)) {
2403                 if (ma->mca_flags & MAF_LAST_REPORTER)
2404                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2405                                 ICMPV6_MGM_REDUCTION);
2406         } else {
2407                 mld_add_delrec(ma->idev, ma);
2408                 mld_ifc_event(ma->idev);
2409         }
2410 }
2411 
2412 static void mld_gq_timer_expire(unsigned long data)
2413 {
2414         struct inet6_dev *idev = (struct inet6_dev *)data;
2415 
2416         idev->mc_gq_running = 0;
2417         mld_send_report(idev, NULL);
2418         in6_dev_put(idev);
2419 }
2420 
2421 static void mld_ifc_timer_expire(unsigned long data)
2422 {
2423         struct inet6_dev *idev = (struct inet6_dev *)data;
2424 
2425         mld_send_cr(idev);
2426         if (idev->mc_ifc_count) {
2427                 idev->mc_ifc_count--;
2428                 if (idev->mc_ifc_count)
2429                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2430         }
2431         in6_dev_put(idev);
2432 }
2433 
2434 static void mld_ifc_event(struct inet6_dev *idev)
2435 {
2436         if (mld_in_v1_mode(idev))
2437                 return;
2438         idev->mc_ifc_count = idev->mc_qrv;
2439         mld_ifc_start_timer(idev, 1);
2440 }
2441 
2442 
2443 static void igmp6_timer_handler(unsigned long data)
2444 {
2445         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2446 
2447         if (mld_in_v1_mode(ma->idev))
2448                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2449         else
2450                 mld_send_report(ma->idev, ma);
2451 
2452         spin_lock(&ma->mca_lock);
2453         ma->mca_flags |=  MAF_LAST_REPORTER;
2454         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2455         spin_unlock(&ma->mca_lock);
2456         ma_put(ma);
2457 }
2458 
2459 /* Device changing type */
2460 
2461 void ipv6_mc_unmap(struct inet6_dev *idev)
2462 {
2463         struct ifmcaddr6 *i;
2464 
2465         /* Install multicast list, except for all-nodes (already installed) */
2466 
2467         read_lock_bh(&idev->lock);
2468         for (i = idev->mc_list; i; i = i->next)
2469                 igmp6_group_dropped(i);
2470         read_unlock_bh(&idev->lock);
2471 }
2472 
2473 void ipv6_mc_remap(struct inet6_dev *idev)
2474 {
2475         ipv6_mc_up(idev);
2476 }
2477 
2478 /* Device going down */
2479 
2480 void ipv6_mc_down(struct inet6_dev *idev)
2481 {
2482         struct ifmcaddr6 *i;
2483 
2484         /* Withdraw multicast list */
2485 
2486         read_lock_bh(&idev->lock);
2487         mld_ifc_stop_timer(idev);
2488         mld_gq_stop_timer(idev);
2489         mld_dad_stop_timer(idev);
2490 
2491         for (i = idev->mc_list; i; i = i->next)
2492                 igmp6_group_dropped(i);
2493         read_unlock_bh(&idev->lock);
2494 
2495         mld_clear_delrec(idev);
2496 }
2497 
2498 static void ipv6_mc_reset(struct inet6_dev *idev)
2499 {
2500         idev->mc_qrv = sysctl_mld_qrv;
2501         idev->mc_qi = MLD_QI_DEFAULT;
2502         idev->mc_qri = MLD_QRI_DEFAULT;
2503         idev->mc_v1_seen = 0;
2504         idev->mc_maxdelay = unsolicited_report_interval(idev);
2505 }
2506 
2507 /* Device going up */
2508 
2509 void ipv6_mc_up(struct inet6_dev *idev)
2510 {
2511         struct ifmcaddr6 *i;
2512 
2513         /* Install multicast list, except for all-nodes (already installed) */
2514 
2515         read_lock_bh(&idev->lock);
2516         ipv6_mc_reset(idev);
2517         for (i = idev->mc_list; i; i = i->next)
2518                 igmp6_group_added(i);
2519         read_unlock_bh(&idev->lock);
2520 }
2521 
2522 /* IPv6 device initialization. */
2523 
2524 void ipv6_mc_init_dev(struct inet6_dev *idev)
2525 {
2526         write_lock_bh(&idev->lock);
2527         spin_lock_init(&idev->mc_lock);
2528         idev->mc_gq_running = 0;
2529         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2530                         (unsigned long)idev);
2531         idev->mc_tomb = NULL;
2532         idev->mc_ifc_count = 0;
2533         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2534                         (unsigned long)idev);
2535         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2536                     (unsigned long)idev);
2537         ipv6_mc_reset(idev);
2538         write_unlock_bh(&idev->lock);
2539 }
2540 
2541 /*
2542  *      Device is about to be destroyed: clean up.
2543  */
2544 
2545 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2546 {
2547         struct ifmcaddr6 *i;
2548 
2549         /* Deactivate timers */
2550         ipv6_mc_down(idev);
2551 
2552         /* Delete all-nodes address. */
2553         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2554          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2555          * fail.
2556          */
2557         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2558 
2559         if (idev->cnf.forwarding)
2560                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2561 
2562         write_lock_bh(&idev->lock);
2563         while ((i = idev->mc_list) != NULL) {
2564                 idev->mc_list = i->next;
2565                 write_unlock_bh(&idev->lock);
2566 
2567                 igmp6_group_dropped(i);
2568                 ma_put(i);
2569 
2570                 write_lock_bh(&idev->lock);
2571         }
2572         write_unlock_bh(&idev->lock);
2573 }
2574 
2575 #ifdef CONFIG_PROC_FS
2576 struct igmp6_mc_iter_state {
2577         struct seq_net_private p;
2578         struct net_device *dev;
2579         struct inet6_dev *idev;
2580 };
2581 
2582 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2583 
2584 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2585 {
2586         struct ifmcaddr6 *im = NULL;
2587         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2588         struct net *net = seq_file_net(seq);
2589 
2590         state->idev = NULL;
2591         for_each_netdev_rcu(net, state->dev) {
2592                 struct inet6_dev *idev;
2593                 idev = __in6_dev_get(state->dev);
2594                 if (!idev)
2595                         continue;
2596                 read_lock_bh(&idev->lock);
2597                 im = idev->mc_list;
2598                 if (im) {
2599                         state->idev = idev;
2600                         break;
2601                 }
2602                 read_unlock_bh(&idev->lock);
2603         }
2604         return im;
2605 }
2606 
2607 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2608 {
2609         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2610 
2611         im = im->next;
2612         while (!im) {
2613                 if (likely(state->idev))
2614                         read_unlock_bh(&state->idev->lock);
2615 
2616                 state->dev = next_net_device_rcu(state->dev);
2617                 if (!state->dev) {
2618                         state->idev = NULL;
2619                         break;
2620                 }
2621                 state->idev = __in6_dev_get(state->dev);
2622                 if (!state->idev)
2623                         continue;
2624                 read_lock_bh(&state->idev->lock);
2625                 im = state->idev->mc_list;
2626         }
2627         return im;
2628 }
2629 
2630 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2631 {
2632         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2633         if (im)
2634                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2635                         --pos;
2636         return pos ? NULL : im;
2637 }
2638 
2639 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2640         __acquires(RCU)
2641 {
2642         rcu_read_lock();
2643         return igmp6_mc_get_idx(seq, *pos);
2644 }
2645 
2646 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2647 {
2648         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2649 
2650         ++*pos;
2651         return im;
2652 }
2653 
2654 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2655         __releases(RCU)
2656 {
2657         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2658 
2659         if (likely(state->idev)) {
2660                 read_unlock_bh(&state->idev->lock);
2661                 state->idev = NULL;
2662         }
2663         state->dev = NULL;
2664         rcu_read_unlock();
2665 }
2666 
2667 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2668 {
2669         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2670         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2671 
2672         seq_printf(seq,
2673                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2674                    state->dev->ifindex, state->dev->name,
2675                    &im->mca_addr,
2676                    im->mca_users, im->mca_flags,
2677                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2678                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2679         return 0;
2680 }
2681 
2682 static const struct seq_operations igmp6_mc_seq_ops = {
2683         .start  =       igmp6_mc_seq_start,
2684         .next   =       igmp6_mc_seq_next,
2685         .stop   =       igmp6_mc_seq_stop,
2686         .show   =       igmp6_mc_seq_show,
2687 };
2688 
2689 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2690 {
2691         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2692                             sizeof(struct igmp6_mc_iter_state));
2693 }
2694 
2695 static const struct file_operations igmp6_mc_seq_fops = {
2696         .owner          =       THIS_MODULE,
2697         .open           =       igmp6_mc_seq_open,
2698         .read           =       seq_read,
2699         .llseek         =       seq_lseek,
2700         .release        =       seq_release_net,
2701 };
2702 
2703 struct igmp6_mcf_iter_state {
2704         struct seq_net_private p;
2705         struct net_device *dev;
2706         struct inet6_dev *idev;
2707         struct ifmcaddr6 *im;
2708 };
2709 
2710 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2711 
2712 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2713 {
2714         struct ip6_sf_list *psf = NULL;
2715         struct ifmcaddr6 *im = NULL;
2716         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2717         struct net *net = seq_file_net(seq);
2718 
2719         state->idev = NULL;
2720         state->im = NULL;
2721         for_each_netdev_rcu(net, state->dev) {
2722                 struct inet6_dev *idev;
2723                 idev = __in6_dev_get(state->dev);
2724                 if (unlikely(idev == NULL))
2725                         continue;
2726                 read_lock_bh(&idev->lock);
2727                 im = idev->mc_list;
2728                 if (likely(im)) {
2729                         spin_lock_bh(&im->mca_lock);
2730                         psf = im->mca_sources;
2731                         if (likely(psf)) {
2732                                 state->im = im;
2733                                 state->idev = idev;
2734                                 break;
2735                         }
2736                         spin_unlock_bh(&im->mca_lock);
2737                 }
2738                 read_unlock_bh(&idev->lock);
2739         }
2740         return psf;
2741 }
2742 
2743 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2744 {
2745         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2746 
2747         psf = psf->sf_next;
2748         while (!psf) {
2749                 spin_unlock_bh(&state->im->mca_lock);
2750                 state->im = state->im->next;
2751                 while (!state->im) {
2752                         if (likely(state->idev))
2753                                 read_unlock_bh(&state->idev->lock);
2754 
2755                         state->dev = next_net_device_rcu(state->dev);
2756                         if (!state->dev) {
2757                                 state->idev = NULL;
2758                                 goto out;
2759                         }
2760                         state->idev = __in6_dev_get(state->dev);
2761                         if (!state->idev)
2762                                 continue;
2763                         read_lock_bh(&state->idev->lock);
2764                         state->im = state->idev->mc_list;
2765                 }
2766                 if (!state->im)
2767                         break;
2768                 spin_lock_bh(&state->im->mca_lock);
2769                 psf = state->im->mca_sources;
2770         }
2771 out:
2772         return psf;
2773 }
2774 
2775 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2776 {
2777         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2778         if (psf)
2779                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2780                         --pos;
2781         return pos ? NULL : psf;
2782 }
2783 
2784 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2785         __acquires(RCU)
2786 {
2787         rcu_read_lock();
2788         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2789 }
2790 
2791 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2792 {
2793         struct ip6_sf_list *psf;
2794         if (v == SEQ_START_TOKEN)
2795                 psf = igmp6_mcf_get_first(seq);
2796         else
2797                 psf = igmp6_mcf_get_next(seq, v);
2798         ++*pos;
2799         return psf;
2800 }
2801 
2802 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2803         __releases(RCU)
2804 {
2805         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2806         if (likely(state->im)) {
2807                 spin_unlock_bh(&state->im->mca_lock);
2808                 state->im = NULL;
2809         }
2810         if (likely(state->idev)) {
2811                 read_unlock_bh(&state->idev->lock);
2812                 state->idev = NULL;
2813         }
2814         state->dev = NULL;
2815         rcu_read_unlock();
2816 }
2817 
2818 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2819 {
2820         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2821         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2822 
2823         if (v == SEQ_START_TOKEN) {
2824                 seq_puts(seq, "Idx Device                Multicast Address                   Source Address    INC    EXC\n");
2825         } else {
2826                 seq_printf(seq,
2827                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2828                            state->dev->ifindex, state->dev->name,
2829                            &state->im->mca_addr,
2830                            &psf->sf_addr,
2831                            psf->sf_count[MCAST_INCLUDE],
2832                            psf->sf_count[MCAST_EXCLUDE]);
2833         }
2834         return 0;
2835 }
2836 
2837 static const struct seq_operations igmp6_mcf_seq_ops = {
2838         .start  =       igmp6_mcf_seq_start,
2839         .next   =       igmp6_mcf_seq_next,
2840         .stop   =       igmp6_mcf_seq_stop,
2841         .show   =       igmp6_mcf_seq_show,
2842 };
2843 
2844 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2845 {
2846         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2847                             sizeof(struct igmp6_mcf_iter_state));
2848 }
2849 
2850 static const struct file_operations igmp6_mcf_seq_fops = {
2851         .owner          =       THIS_MODULE,
2852         .open           =       igmp6_mcf_seq_open,
2853         .read           =       seq_read,
2854         .llseek         =       seq_lseek,
2855         .release        =       seq_release_net,
2856 };
2857 
2858 static int __net_init igmp6_proc_init(struct net *net)
2859 {
2860         int err;
2861 
2862         err = -ENOMEM;
2863         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2864                 goto out;
2865         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2866                          &igmp6_mcf_seq_fops))
2867                 goto out_proc_net_igmp6;
2868 
2869         err = 0;
2870 out:
2871         return err;
2872 
2873 out_proc_net_igmp6:
2874         remove_proc_entry("igmp6", net->proc_net);
2875         goto out;
2876 }
2877 
2878 static void __net_exit igmp6_proc_exit(struct net *net)
2879 {
2880         remove_proc_entry("mcfilter6", net->proc_net);
2881         remove_proc_entry("igmp6", net->proc_net);
2882 }
2883 #else
2884 static inline int igmp6_proc_init(struct net *net)
2885 {
2886         return 0;
2887 }
2888 static inline void igmp6_proc_exit(struct net *net)
2889 {
2890 }
2891 #endif
2892 
2893 static int __net_init igmp6_net_init(struct net *net)
2894 {
2895         int err;
2896 
2897         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2898                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2899         if (err < 0) {
2900                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2901                        err);
2902                 goto out;
2903         }
2904 
2905         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2906 
2907         err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2908                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2909         if (err < 0) {
2910                 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2911                        err);
2912                 goto out_sock_create;
2913         }
2914 
2915         err = igmp6_proc_init(net);
2916         if (err)
2917                 goto out_sock_create_autojoin;
2918 
2919         return 0;
2920 
2921 out_sock_create_autojoin:
2922         inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2923 out_sock_create:
2924         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2925 out:
2926         return err;
2927 }
2928 
2929 static void __net_exit igmp6_net_exit(struct net *net)
2930 {
2931         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2932         inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2933         igmp6_proc_exit(net);
2934 }
2935 
2936 static struct pernet_operations igmp6_net_ops = {
2937         .init = igmp6_net_init,
2938         .exit = igmp6_net_exit,
2939 };
2940 
2941 int __init igmp6_init(void)
2942 {
2943         return register_pernet_subsys(&igmp6_net_ops);
2944 }
2945 
2946 void igmp6_cleanup(void)
2947 {
2948         unregister_pernet_subsys(&igmp6_net_ops);
2949 }
2950 

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