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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         if (!ipv6_addr_is_multicast(addr))
144                 return -EINVAL;
145 
146         rcu_read_lock();
147         for_each_pmc_rcu(np, mc_lst) {
148                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
149                     ipv6_addr_equal(&mc_lst->addr, addr)) {
150                         rcu_read_unlock();
151                         return -EADDRINUSE;
152                 }
153         }
154         rcu_read_unlock();
155 
156         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
157 
158         if (mc_lst == NULL)
159                 return -ENOMEM;
160 
161         mc_lst->next = NULL;
162         mc_lst->addr = *addr;
163 
164         rtnl_lock();
165         if (ifindex == 0) {
166                 struct rt6_info *rt;
167                 rt = rt6_lookup(net, addr, NULL, 0, 0);
168                 if (rt) {
169                         dev = rt->dst.dev;
170                         ip6_rt_put(rt);
171                 }
172         } else
173                 dev = __dev_get_by_index(net, ifindex);
174 
175         if (dev == NULL) {
176                 rtnl_unlock();
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                 rtnl_unlock();
194                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
195                 return err;
196         }
197 
198         mc_lst->next = np->ipv6_mc_list;
199         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
200 
201         rtnl_unlock();
202 
203         return 0;
204 }
205 
206 /*
207  *      socket leave on multicast group
208  */
209 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
210 {
211         struct ipv6_pinfo *np = inet6_sk(sk);
212         struct ipv6_mc_socklist *mc_lst;
213         struct ipv6_mc_socklist __rcu **lnk;
214         struct net *net = sock_net(sk);
215 
216         if (!ipv6_addr_is_multicast(addr))
217                 return -EINVAL;
218 
219         rtnl_lock();
220         for (lnk = &np->ipv6_mc_list;
221              (mc_lst = rtnl_dereference(*lnk)) != NULL;
222               lnk = &mc_lst->next) {
223                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
224                     ipv6_addr_equal(&mc_lst->addr, addr)) {
225                         struct net_device *dev;
226 
227                         *lnk = mc_lst->next;
228 
229                         dev = __dev_get_by_index(net, mc_lst->ifindex);
230                         if (dev != NULL) {
231                                 struct inet6_dev *idev = __in6_dev_get(dev);
232 
233                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
234                                 if (idev)
235                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
236                         } else
237                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
238                         rtnl_unlock();
239 
240                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
241                         kfree_rcu(mc_lst, rcu);
242                         return 0;
243                 }
244         }
245         rtnl_unlock();
246 
247         return -EADDRNOTAVAIL;
248 }
249 
250 /* called with rcu_read_lock() */
251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
252                                              const struct in6_addr *group,
253                                              int ifindex)
254 {
255         struct net_device *dev = NULL;
256         struct inet6_dev *idev = NULL;
257 
258         if (ifindex == 0) {
259                 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
260 
261                 if (rt) {
262                         dev = rt->dst.dev;
263                         ip6_rt_put(rt);
264                 }
265         } else
266                 dev = dev_get_by_index_rcu(net, ifindex);
267 
268         if (!dev)
269                 return NULL;
270         idev = __in6_dev_get(dev);
271         if (!idev)
272                 return NULL;
273         read_lock_bh(&idev->lock);
274         if (idev->dead) {
275                 read_unlock_bh(&idev->lock);
276                 return NULL;
277         }
278         return idev;
279 }
280 
281 void ipv6_sock_mc_close(struct sock *sk)
282 {
283         struct ipv6_pinfo *np = inet6_sk(sk);
284         struct ipv6_mc_socklist *mc_lst;
285         struct net *net = sock_net(sk);
286 
287         if (!rcu_access_pointer(np->ipv6_mc_list))
288                 return;
289 
290         rtnl_lock();
291         while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
292                 struct net_device *dev;
293 
294                 np->ipv6_mc_list = mc_lst->next;
295 
296                 dev = __dev_get_by_index(net, mc_lst->ifindex);
297                 if (dev) {
298                         struct inet6_dev *idev = __in6_dev_get(dev);
299 
300                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
301                         if (idev)
302                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
303                 } else
304                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
305 
306                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
307                 kfree_rcu(mc_lst, rcu);
308 
309         }
310         rtnl_unlock();
311 }
312 
313 int ip6_mc_source(int add, int omode, struct sock *sk,
314         struct group_source_req *pgsr)
315 {
316         struct in6_addr *source, *group;
317         struct ipv6_mc_socklist *pmc;
318         struct inet6_dev *idev;
319         struct ipv6_pinfo *inet6 = inet6_sk(sk);
320         struct ip6_sf_socklist *psl;
321         struct net *net = sock_net(sk);
322         int i, j, rv;
323         int leavegroup = 0;
324         int pmclocked = 0;
325         int err;
326 
327         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
328         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
329 
330         if (!ipv6_addr_is_multicast(group))
331                 return -EINVAL;
332 
333         rcu_read_lock();
334         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
335         if (!idev) {
336                 rcu_read_unlock();
337                 return -ENODEV;
338         }
339 
340         err = -EADDRNOTAVAIL;
341 
342         for_each_pmc_rcu(inet6, pmc) {
343                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
344                         continue;
345                 if (ipv6_addr_equal(&pmc->addr, group))
346                         break;
347         }
348         if (!pmc) {             /* must have a prior join */
349                 err = -EINVAL;
350                 goto done;
351         }
352         /* if a source filter was set, must be the same mode as before */
353         if (pmc->sflist) {
354                 if (pmc->sfmode != omode) {
355                         err = -EINVAL;
356                         goto done;
357                 }
358         } else if (pmc->sfmode != omode) {
359                 /* allow mode switches for empty-set filters */
360                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
361                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
362                 pmc->sfmode = omode;
363         }
364 
365         write_lock(&pmc->sflock);
366         pmclocked = 1;
367 
368         psl = pmc->sflist;
369         if (!add) {
370                 if (!psl)
371                         goto done;      /* err = -EADDRNOTAVAIL */
372                 rv = !0;
373                 for (i = 0; i < psl->sl_count; i++) {
374                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
375                         if (rv == 0)
376                                 break;
377                 }
378                 if (rv)         /* source not found */
379                         goto done;      /* err = -EADDRNOTAVAIL */
380 
381                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
382                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
383                         leavegroup = 1;
384                         goto done;
385                 }
386 
387                 /* update the interface filter */
388                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
389 
390                 for (j = i+1; j < psl->sl_count; j++)
391                         psl->sl_addr[j-1] = psl->sl_addr[j];
392                 psl->sl_count--;
393                 err = 0;
394                 goto done;
395         }
396         /* else, add a new source to the filter */
397 
398         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
399                 err = -ENOBUFS;
400                 goto done;
401         }
402         if (!psl || psl->sl_count == psl->sl_max) {
403                 struct ip6_sf_socklist *newpsl;
404                 int count = IP6_SFBLOCK;
405 
406                 if (psl)
407                         count += psl->sl_max;
408                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
409                 if (!newpsl) {
410                         err = -ENOBUFS;
411                         goto done;
412                 }
413                 newpsl->sl_max = count;
414                 newpsl->sl_count = count - IP6_SFBLOCK;
415                 if (psl) {
416                         for (i = 0; i < psl->sl_count; i++)
417                                 newpsl->sl_addr[i] = psl->sl_addr[i];
418                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
419                 }
420                 pmc->sflist = psl = newpsl;
421         }
422         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
423         for (i = 0; i < psl->sl_count; i++) {
424                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
425                 if (rv == 0) /* There is an error in the address. */
426                         goto done;
427         }
428         for (j = psl->sl_count-1; j >= i; j--)
429                 psl->sl_addr[j+1] = psl->sl_addr[j];
430         psl->sl_addr[i] = *source;
431         psl->sl_count++;
432         err = 0;
433         /* update the interface list */
434         ip6_mc_add_src(idev, group, omode, 1, source, 1);
435 done:
436         if (pmclocked)
437                 write_unlock(&pmc->sflock);
438         read_unlock_bh(&idev->lock);
439         rcu_read_unlock();
440         if (leavegroup)
441                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
442         return err;
443 }
444 
445 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
446 {
447         const struct in6_addr *group;
448         struct ipv6_mc_socklist *pmc;
449         struct inet6_dev *idev;
450         struct ipv6_pinfo *inet6 = inet6_sk(sk);
451         struct ip6_sf_socklist *newpsl, *psl;
452         struct net *net = sock_net(sk);
453         int leavegroup = 0;
454         int i, err;
455 
456         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
457 
458         if (!ipv6_addr_is_multicast(group))
459                 return -EINVAL;
460         if (gsf->gf_fmode != MCAST_INCLUDE &&
461             gsf->gf_fmode != MCAST_EXCLUDE)
462                 return -EINVAL;
463 
464         rcu_read_lock();
465         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
466 
467         if (!idev) {
468                 rcu_read_unlock();
469                 return -ENODEV;
470         }
471 
472         err = 0;
473 
474         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
475                 leavegroup = 1;
476                 goto done;
477         }
478 
479         for_each_pmc_rcu(inet6, pmc) {
480                 if (pmc->ifindex != gsf->gf_interface)
481                         continue;
482                 if (ipv6_addr_equal(&pmc->addr, group))
483                         break;
484         }
485         if (!pmc) {             /* must have a prior join */
486                 err = -EINVAL;
487                 goto done;
488         }
489         if (gsf->gf_numsrc) {
490                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
491                                                           GFP_ATOMIC);
492                 if (!newpsl) {
493                         err = -ENOBUFS;
494                         goto done;
495                 }
496                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
497                 for (i = 0; i < newpsl->sl_count; ++i) {
498                         struct sockaddr_in6 *psin6;
499 
500                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
501                         newpsl->sl_addr[i] = psin6->sin6_addr;
502                 }
503                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
504                         newpsl->sl_count, newpsl->sl_addr, 0);
505                 if (err) {
506                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
507                         goto done;
508                 }
509         } else {
510                 newpsl = NULL;
511                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
512         }
513 
514         write_lock(&pmc->sflock);
515         psl = pmc->sflist;
516         if (psl) {
517                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
518                         psl->sl_count, psl->sl_addr, 0);
519                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
520         } else
521                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
522         pmc->sflist = newpsl;
523         pmc->sfmode = gsf->gf_fmode;
524         write_unlock(&pmc->sflock);
525         err = 0;
526 done:
527         read_unlock_bh(&idev->lock);
528         rcu_read_unlock();
529         if (leavegroup)
530                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
531         return err;
532 }
533 
534 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
535         struct group_filter __user *optval, int __user *optlen)
536 {
537         int err, i, count, copycount;
538         const struct in6_addr *group;
539         struct ipv6_mc_socklist *pmc;
540         struct inet6_dev *idev;
541         struct ipv6_pinfo *inet6 = inet6_sk(sk);
542         struct ip6_sf_socklist *psl;
543         struct net *net = sock_net(sk);
544 
545         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
546 
547         if (!ipv6_addr_is_multicast(group))
548                 return -EINVAL;
549 
550         rcu_read_lock();
551         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
552 
553         if (!idev) {
554                 rcu_read_unlock();
555                 return -ENODEV;
556         }
557 
558         err = -EADDRNOTAVAIL;
559         /* changes to the ipv6_mc_list require the socket lock and
560          * rtnl lock. We have the socket lock and rcu read lock,
561          * so reading the list is safe.
562          */
563 
564         for_each_pmc_rcu(inet6, pmc) {
565                 if (pmc->ifindex != gsf->gf_interface)
566                         continue;
567                 if (ipv6_addr_equal(group, &pmc->addr))
568                         break;
569         }
570         if (!pmc)               /* must have a prior join */
571                 goto done;
572         gsf->gf_fmode = pmc->sfmode;
573         psl = pmc->sflist;
574         count = psl ? psl->sl_count : 0;
575         read_unlock_bh(&idev->lock);
576         rcu_read_unlock();
577 
578         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
579         gsf->gf_numsrc = count;
580         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
581             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
582                 return -EFAULT;
583         }
584         /* changes to psl require the socket lock, and a write lock
585          * on pmc->sflock. We have the socket lock so reading here is safe.
586          */
587         for (i = 0; i < copycount; i++) {
588                 struct sockaddr_in6 *psin6;
589                 struct sockaddr_storage ss;
590 
591                 psin6 = (struct sockaddr_in6 *)&ss;
592                 memset(&ss, 0, sizeof(ss));
593                 psin6->sin6_family = AF_INET6;
594                 psin6->sin6_addr = psl->sl_addr[i];
595                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
596                         return -EFAULT;
597         }
598         return 0;
599 done:
600         read_unlock_bh(&idev->lock);
601         rcu_read_unlock();
602         return err;
603 }
604 
605 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
606                     const struct in6_addr *src_addr)
607 {
608         struct ipv6_pinfo *np = inet6_sk(sk);
609         struct ipv6_mc_socklist *mc;
610         struct ip6_sf_socklist *psl;
611         bool rv = true;
612 
613         rcu_read_lock();
614         for_each_pmc_rcu(np, mc) {
615                 if (ipv6_addr_equal(&mc->addr, mc_addr))
616                         break;
617         }
618         if (!mc) {
619                 rcu_read_unlock();
620                 return true;
621         }
622         read_lock(&mc->sflock);
623         psl = mc->sflist;
624         if (!psl) {
625                 rv = mc->sfmode == MCAST_EXCLUDE;
626         } else {
627                 int i;
628 
629                 for (i = 0; i < psl->sl_count; i++) {
630                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
631                                 break;
632                 }
633                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
634                         rv = false;
635                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
636                         rv = false;
637         }
638         read_unlock(&mc->sflock);
639         rcu_read_unlock();
640 
641         return rv;
642 }
643 
644 static void igmp6_group_added(struct ifmcaddr6 *mc)
645 {
646         struct net_device *dev = mc->idev->dev;
647         char buf[MAX_ADDR_LEN];
648 
649         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
650             IPV6_ADDR_SCOPE_LINKLOCAL)
651                 return;
652 
653         spin_lock_bh(&mc->mca_lock);
654         if (!(mc->mca_flags&MAF_LOADED)) {
655                 mc->mca_flags |= MAF_LOADED;
656                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
657                         dev_mc_add(dev, buf);
658         }
659         spin_unlock_bh(&mc->mca_lock);
660 
661         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
662                 return;
663 
664         if (mld_in_v1_mode(mc->idev)) {
665                 igmp6_join_group(mc);
666                 return;
667         }
668         /* else v2 */
669 
670         mc->mca_crcount = mc->idev->mc_qrv;
671         mld_ifc_event(mc->idev);
672 }
673 
674 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
675 {
676         struct net_device *dev = mc->idev->dev;
677         char buf[MAX_ADDR_LEN];
678 
679         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
680             IPV6_ADDR_SCOPE_LINKLOCAL)
681                 return;
682 
683         spin_lock_bh(&mc->mca_lock);
684         if (mc->mca_flags&MAF_LOADED) {
685                 mc->mca_flags &= ~MAF_LOADED;
686                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
687                         dev_mc_del(dev, buf);
688         }
689 
690         if (mc->mca_flags & MAF_NOREPORT)
691                 goto done;
692         spin_unlock_bh(&mc->mca_lock);
693 
694         if (!mc->idev->dead)
695                 igmp6_leave_group(mc);
696 
697         spin_lock_bh(&mc->mca_lock);
698         if (del_timer(&mc->mca_timer))
699                 atomic_dec(&mc->mca_refcnt);
700 done:
701         ip6_mc_clear_src(mc);
702         spin_unlock_bh(&mc->mca_lock);
703 }
704 
705 /*
706  * deleted ifmcaddr6 manipulation
707  */
708 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
709 {
710         struct ifmcaddr6 *pmc;
711 
712         /* this is an "ifmcaddr6" for convenience; only the fields below
713          * are actually used. In particular, the refcnt and users are not
714          * used for management of the delete list. Using the same structure
715          * for deleted items allows change reports to use common code with
716          * non-deleted or query-response MCA's.
717          */
718         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
719         if (!pmc)
720                 return;
721 
722         spin_lock_bh(&im->mca_lock);
723         spin_lock_init(&pmc->mca_lock);
724         pmc->idev = im->idev;
725         in6_dev_hold(idev);
726         pmc->mca_addr = im->mca_addr;
727         pmc->mca_crcount = idev->mc_qrv;
728         pmc->mca_sfmode = im->mca_sfmode;
729         if (pmc->mca_sfmode == MCAST_INCLUDE) {
730                 struct ip6_sf_list *psf;
731 
732                 pmc->mca_tomb = im->mca_tomb;
733                 pmc->mca_sources = im->mca_sources;
734                 im->mca_tomb = im->mca_sources = NULL;
735                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
736                         psf->sf_crcount = pmc->mca_crcount;
737         }
738         spin_unlock_bh(&im->mca_lock);
739 
740         spin_lock_bh(&idev->mc_lock);
741         pmc->next = idev->mc_tomb;
742         idev->mc_tomb = pmc;
743         spin_unlock_bh(&idev->mc_lock);
744 }
745 
746 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
747 {
748         struct ifmcaddr6 *pmc, *pmc_prev;
749         struct ip6_sf_list *psf, *psf_next;
750 
751         spin_lock_bh(&idev->mc_lock);
752         pmc_prev = NULL;
753         for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
754                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
755                         break;
756                 pmc_prev = pmc;
757         }
758         if (pmc) {
759                 if (pmc_prev)
760                         pmc_prev->next = pmc->next;
761                 else
762                         idev->mc_tomb = pmc->next;
763         }
764         spin_unlock_bh(&idev->mc_lock);
765 
766         if (pmc) {
767                 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
768                         psf_next = psf->sf_next;
769                         kfree(psf);
770                 }
771                 in6_dev_put(pmc->idev);
772                 kfree(pmc);
773         }
774 }
775 
776 static void mld_clear_delrec(struct inet6_dev *idev)
777 {
778         struct ifmcaddr6 *pmc, *nextpmc;
779 
780         spin_lock_bh(&idev->mc_lock);
781         pmc = idev->mc_tomb;
782         idev->mc_tomb = NULL;
783         spin_unlock_bh(&idev->mc_lock);
784 
785         for (; pmc; pmc = nextpmc) {
786                 nextpmc = pmc->next;
787                 ip6_mc_clear_src(pmc);
788                 in6_dev_put(pmc->idev);
789                 kfree(pmc);
790         }
791 
792         /* clear dead sources, too */
793         read_lock_bh(&idev->lock);
794         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
795                 struct ip6_sf_list *psf, *psf_next;
796 
797                 spin_lock_bh(&pmc->mca_lock);
798                 psf = pmc->mca_tomb;
799                 pmc->mca_tomb = NULL;
800                 spin_unlock_bh(&pmc->mca_lock);
801                 for (; psf; psf = psf_next) {
802                         psf_next = psf->sf_next;
803                         kfree(psf);
804                 }
805         }
806         read_unlock_bh(&idev->lock);
807 }
808 
809 static void mca_get(struct ifmcaddr6 *mc)
810 {
811         atomic_inc(&mc->mca_refcnt);
812 }
813 
814 static void ma_put(struct ifmcaddr6 *mc)
815 {
816         if (atomic_dec_and_test(&mc->mca_refcnt)) {
817                 in6_dev_put(mc->idev);
818                 kfree(mc);
819         }
820 }
821 
822 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
823                                    const struct in6_addr *addr)
824 {
825         struct ifmcaddr6 *mc;
826 
827         mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
828         if (mc == NULL)
829                 return NULL;
830 
831         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
832 
833         mc->mca_addr = *addr;
834         mc->idev = idev; /* reference taken by caller */
835         mc->mca_users = 1;
836         /* mca_stamp should be updated upon changes */
837         mc->mca_cstamp = mc->mca_tstamp = jiffies;
838         atomic_set(&mc->mca_refcnt, 1);
839         spin_lock_init(&mc->mca_lock);
840 
841         /* initial mode is (EX, empty) */
842         mc->mca_sfmode = MCAST_EXCLUDE;
843         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
844 
845         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
846             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
847                 mc->mca_flags |= MAF_NOREPORT;
848 
849         return mc;
850 }
851 
852 /*
853  *      device multicast group inc (add if not found)
854  */
855 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
856 {
857         struct ifmcaddr6 *mc;
858         struct inet6_dev *idev;
859 
860         ASSERT_RTNL();
861 
862         /* we need to take a reference on idev */
863         idev = in6_dev_get(dev);
864 
865         if (idev == NULL)
866                 return -EINVAL;
867 
868         write_lock_bh(&idev->lock);
869         if (idev->dead) {
870                 write_unlock_bh(&idev->lock);
871                 in6_dev_put(idev);
872                 return -ENODEV;
873         }
874 
875         for (mc = idev->mc_list; mc; mc = mc->next) {
876                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
877                         mc->mca_users++;
878                         write_unlock_bh(&idev->lock);
879                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
880                                 NULL, 0);
881                         in6_dev_put(idev);
882                         return 0;
883                 }
884         }
885 
886         mc = mca_alloc(idev, addr);
887         if (!mc) {
888                 write_unlock_bh(&idev->lock);
889                 in6_dev_put(idev);
890                 return -ENOMEM;
891         }
892 
893         mc->next = idev->mc_list;
894         idev->mc_list = mc;
895 
896         /* Hold this for the code below before we unlock,
897          * it is already exposed via idev->mc_list.
898          */
899         mca_get(mc);
900         write_unlock_bh(&idev->lock);
901 
902         mld_del_delrec(idev, &mc->mca_addr);
903         igmp6_group_added(mc);
904         ma_put(mc);
905         return 0;
906 }
907 
908 /*
909  *      device multicast group del
910  */
911 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
912 {
913         struct ifmcaddr6 *ma, **map;
914 
915         ASSERT_RTNL();
916 
917         write_lock_bh(&idev->lock);
918         for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
919                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
920                         if (--ma->mca_users == 0) {
921                                 *map = ma->next;
922                                 write_unlock_bh(&idev->lock);
923 
924                                 igmp6_group_dropped(ma);
925 
926                                 ma_put(ma);
927                                 return 0;
928                         }
929                         write_unlock_bh(&idev->lock);
930                         return 0;
931                 }
932         }
933         write_unlock_bh(&idev->lock);
934 
935         return -ENOENT;
936 }
937 
938 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
939 {
940         struct inet6_dev *idev;
941         int err;
942 
943         ASSERT_RTNL();
944 
945         idev = __in6_dev_get(dev);
946         if (!idev)
947                 err = -ENODEV;
948         else
949                 err = __ipv6_dev_mc_dec(idev, addr);
950 
951         return err;
952 }
953 
954 /*
955  *      check if the interface/address pair is valid
956  */
957 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
958                          const struct in6_addr *src_addr)
959 {
960         struct inet6_dev *idev;
961         struct ifmcaddr6 *mc;
962         bool rv = false;
963 
964         rcu_read_lock();
965         idev = __in6_dev_get(dev);
966         if (idev) {
967                 read_lock_bh(&idev->lock);
968                 for (mc = idev->mc_list; mc; mc = mc->next) {
969                         if (ipv6_addr_equal(&mc->mca_addr, group))
970                                 break;
971                 }
972                 if (mc) {
973                         if (src_addr && !ipv6_addr_any(src_addr)) {
974                                 struct ip6_sf_list *psf;
975 
976                                 spin_lock_bh(&mc->mca_lock);
977                                 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
978                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
979                                                 break;
980                                 }
981                                 if (psf)
982                                         rv = psf->sf_count[MCAST_INCLUDE] ||
983                                                 psf->sf_count[MCAST_EXCLUDE] !=
984                                                 mc->mca_sfcount[MCAST_EXCLUDE];
985                                 else
986                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
987                                 spin_unlock_bh(&mc->mca_lock);
988                         } else
989                                 rv = true; /* don't filter unspecified source */
990                 }
991                 read_unlock_bh(&idev->lock);
992         }
993         rcu_read_unlock();
994         return rv;
995 }
996 
997 static void mld_gq_start_timer(struct inet6_dev *idev)
998 {
999         unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1000 
1001         idev->mc_gq_running = 1;
1002         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1003                 in6_dev_hold(idev);
1004 }
1005 
1006 static void mld_gq_stop_timer(struct inet6_dev *idev)
1007 {
1008         idev->mc_gq_running = 0;
1009         if (del_timer(&idev->mc_gq_timer))
1010                 __in6_dev_put(idev);
1011 }
1012 
1013 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1014 {
1015         unsigned long tv = prandom_u32() % delay;
1016 
1017         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1018                 in6_dev_hold(idev);
1019 }
1020 
1021 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1022 {
1023         idev->mc_ifc_count = 0;
1024         if (del_timer(&idev->mc_ifc_timer))
1025                 __in6_dev_put(idev);
1026 }
1027 
1028 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1029 {
1030         unsigned long tv = prandom_u32() % delay;
1031 
1032         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1033                 in6_dev_hold(idev);
1034 }
1035 
1036 static void mld_dad_stop_timer(struct inet6_dev *idev)
1037 {
1038         if (del_timer(&idev->mc_dad_timer))
1039                 __in6_dev_put(idev);
1040 }
1041 
1042 /*
1043  *      IGMP handling (alias multicast ICMPv6 messages)
1044  */
1045 
1046 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1047 {
1048         unsigned long delay = resptime;
1049 
1050         /* Do not start timer for these addresses */
1051         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1052             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1053                 return;
1054 
1055         if (del_timer(&ma->mca_timer)) {
1056                 atomic_dec(&ma->mca_refcnt);
1057                 delay = ma->mca_timer.expires - jiffies;
1058         }
1059 
1060         if (delay >= resptime)
1061                 delay = prandom_u32() % resptime;
1062 
1063         ma->mca_timer.expires = jiffies + delay;
1064         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1065                 atomic_inc(&ma->mca_refcnt);
1066         ma->mca_flags |= MAF_TIMER_RUNNING;
1067 }
1068 
1069 /* mark EXCLUDE-mode sources */
1070 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1071                              const struct in6_addr *srcs)
1072 {
1073         struct ip6_sf_list *psf;
1074         int i, scount;
1075 
1076         scount = 0;
1077         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1078                 if (scount == nsrcs)
1079                         break;
1080                 for (i = 0; i < nsrcs; i++) {
1081                         /* skip inactive filters */
1082                         if (psf->sf_count[MCAST_INCLUDE] ||
1083                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1084                             psf->sf_count[MCAST_EXCLUDE])
1085                                 break;
1086                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1087                                 scount++;
1088                                 break;
1089                         }
1090                 }
1091         }
1092         pmc->mca_flags &= ~MAF_GSQUERY;
1093         if (scount == nsrcs)    /* all sources excluded */
1094                 return false;
1095         return true;
1096 }
1097 
1098 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1099                             const struct in6_addr *srcs)
1100 {
1101         struct ip6_sf_list *psf;
1102         int i, scount;
1103 
1104         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1105                 return mld_xmarksources(pmc, nsrcs, srcs);
1106 
1107         /* mark INCLUDE-mode sources */
1108 
1109         scount = 0;
1110         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1111                 if (scount == nsrcs)
1112                         break;
1113                 for (i = 0; i < nsrcs; i++) {
1114                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1115                                 psf->sf_gsresp = 1;
1116                                 scount++;
1117                                 break;
1118                         }
1119                 }
1120         }
1121         if (!scount) {
1122                 pmc->mca_flags &= ~MAF_GSQUERY;
1123                 return false;
1124         }
1125         pmc->mca_flags |= MAF_GSQUERY;
1126         return true;
1127 }
1128 
1129 static int mld_force_mld_version(const struct inet6_dev *idev)
1130 {
1131         /* Normally, both are 0 here. If enforcement to a particular is
1132          * being used, individual device enforcement will have a lower
1133          * precedence over 'all' device (.../conf/all/force_mld_version).
1134          */
1135 
1136         if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1137                 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1138         else
1139                 return idev->cnf.force_mld_version;
1140 }
1141 
1142 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1143 {
1144         return mld_force_mld_version(idev) == 2;
1145 }
1146 
1147 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1148 {
1149         return mld_force_mld_version(idev) == 1;
1150 }
1151 
1152 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1153 {
1154         if (mld_in_v2_mode_only(idev))
1155                 return false;
1156         if (mld_in_v1_mode_only(idev))
1157                 return true;
1158         if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1159                 return true;
1160 
1161         return false;
1162 }
1163 
1164 static void mld_set_v1_mode(struct inet6_dev *idev)
1165 {
1166         /* RFC3810, relevant sections:
1167          *  - 9.1. Robustness Variable
1168          *  - 9.2. Query Interval
1169          *  - 9.3. Query Response Interval
1170          *  - 9.12. Older Version Querier Present Timeout
1171          */
1172         unsigned long switchback;
1173 
1174         switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1175 
1176         idev->mc_v1_seen = jiffies + switchback;
1177 }
1178 
1179 static void mld_update_qrv(struct inet6_dev *idev,
1180                            const struct mld2_query *mlh2)
1181 {
1182         /* RFC3810, relevant sections:
1183          *  - 5.1.8. QRV (Querier's Robustness Variable)
1184          *  - 9.1. Robustness Variable
1185          */
1186 
1187         /* The value of the Robustness Variable MUST NOT be zero,
1188          * and SHOULD NOT be one. Catch this here if we ever run
1189          * into such a case in future.
1190          */
1191         const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1192         WARN_ON(idev->mc_qrv == 0);
1193 
1194         if (mlh2->mld2q_qrv > 0)
1195                 idev->mc_qrv = mlh2->mld2q_qrv;
1196 
1197         if (unlikely(idev->mc_qrv < min_qrv)) {
1198                 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1199                                      idev->mc_qrv, min_qrv);
1200                 idev->mc_qrv = min_qrv;
1201         }
1202 }
1203 
1204 static void mld_update_qi(struct inet6_dev *idev,
1205                           const struct mld2_query *mlh2)
1206 {
1207         /* RFC3810, relevant sections:
1208          *  - 5.1.9. QQIC (Querier's Query Interval Code)
1209          *  - 9.2. Query Interval
1210          *  - 9.12. Older Version Querier Present Timeout
1211          *    (the [Query Interval] in the last Query received)
1212          */
1213         unsigned long mc_qqi;
1214 
1215         if (mlh2->mld2q_qqic < 128) {
1216                 mc_qqi = mlh2->mld2q_qqic;
1217         } else {
1218                 unsigned long mc_man, mc_exp;
1219 
1220                 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1221                 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1222 
1223                 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1224         }
1225 
1226         idev->mc_qi = mc_qqi * HZ;
1227 }
1228 
1229 static void mld_update_qri(struct inet6_dev *idev,
1230                            const struct mld2_query *mlh2)
1231 {
1232         /* RFC3810, relevant sections:
1233          *  - 5.1.3. Maximum Response Code
1234          *  - 9.3. Query Response Interval
1235          */
1236         idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1237 }
1238 
1239 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1240                           unsigned long *max_delay, bool v1_query)
1241 {
1242         unsigned long mldv1_md;
1243 
1244         /* Ignore v1 queries */
1245         if (mld_in_v2_mode_only(idev))
1246                 return -EINVAL;
1247 
1248         mldv1_md = ntohs(mld->mld_maxdelay);
1249 
1250         /* When in MLDv1 fallback and a MLDv2 router start-up being
1251          * unaware of current MLDv1 operation, the MRC == MRD mapping
1252          * only works when the exponential algorithm is not being
1253          * used (as MLDv1 is unaware of such things).
1254          *
1255          * According to the RFC author, the MLDv2 implementations
1256          * he's aware of all use a MRC < 32768 on start up queries.
1257          *
1258          * Thus, should we *ever* encounter something else larger
1259          * than that, just assume the maximum possible within our
1260          * reach.
1261          */
1262         if (!v1_query)
1263                 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1264 
1265         *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1266 
1267         /* MLDv1 router present: we need to go into v1 mode *only*
1268          * when an MLDv1 query is received as per section 9.12. of
1269          * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1270          * queries MUST be of exactly 24 octets.
1271          */
1272         if (v1_query)
1273                 mld_set_v1_mode(idev);
1274 
1275         /* cancel MLDv2 report timer */
1276         mld_gq_stop_timer(idev);
1277         /* cancel the interface change timer */
1278         mld_ifc_stop_timer(idev);
1279         /* clear deleted report items */
1280         mld_clear_delrec(idev);
1281 
1282         return 0;
1283 }
1284 
1285 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1286                           unsigned long *max_delay)
1287 {
1288         *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1289 
1290         mld_update_qrv(idev, mld);
1291         mld_update_qi(idev, mld);
1292         mld_update_qri(idev, mld);
1293 
1294         idev->mc_maxdelay = *max_delay;
1295 
1296         return 0;
1297 }
1298 
1299 /* called with rcu_read_lock() */
1300 int igmp6_event_query(struct sk_buff *skb)
1301 {
1302         struct mld2_query *mlh2 = NULL;
1303         struct ifmcaddr6 *ma;
1304         const struct in6_addr *group;
1305         unsigned long max_delay;
1306         struct inet6_dev *idev;
1307         struct mld_msg *mld;
1308         int group_type;
1309         int mark = 0;
1310         int len, err;
1311 
1312         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1313                 return -EINVAL;
1314 
1315         /* compute payload length excluding extension headers */
1316         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1317         len -= skb_network_header_len(skb);
1318 
1319         /* RFC3810 6.2
1320          * Upon reception of an MLD message that contains a Query, the node
1321          * checks if the source address of the message is a valid link-local
1322          * address, if the Hop Limit is set to 1, and if the Router Alert
1323          * option is present in the Hop-By-Hop Options header of the IPv6
1324          * packet.  If any of these checks fails, the packet is dropped.
1325          */
1326         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1327             ipv6_hdr(skb)->hop_limit != 1 ||
1328             !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1329             IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1330                 return -EINVAL;
1331 
1332         idev = __in6_dev_get(skb->dev);
1333         if (idev == NULL)
1334                 return 0;
1335 
1336         mld = (struct mld_msg *)icmp6_hdr(skb);
1337         group = &mld->mld_mca;
1338         group_type = ipv6_addr_type(group);
1339 
1340         if (group_type != IPV6_ADDR_ANY &&
1341             !(group_type&IPV6_ADDR_MULTICAST))
1342                 return -EINVAL;
1343 
1344         if (len < MLD_V1_QUERY_LEN) {
1345                 return -EINVAL;
1346         } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1347                 err = mld_process_v1(idev, mld, &max_delay,
1348                                      len == MLD_V1_QUERY_LEN);
1349                 if (err < 0)
1350                         return err;
1351         } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1352                 int srcs_offset = sizeof(struct mld2_query) -
1353                                   sizeof(struct icmp6hdr);
1354 
1355                 if (!pskb_may_pull(skb, srcs_offset))
1356                         return -EINVAL;
1357 
1358                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1359 
1360                 err = mld_process_v2(idev, mlh2, &max_delay);
1361                 if (err < 0)
1362                         return err;
1363 
1364                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1365                         if (mlh2->mld2q_nsrcs)
1366                                 return -EINVAL; /* no sources allowed */
1367 
1368                         mld_gq_start_timer(idev);
1369                         return 0;
1370                 }
1371                 /* mark sources to include, if group & source-specific */
1372                 if (mlh2->mld2q_nsrcs != 0) {
1373                         if (!pskb_may_pull(skb, srcs_offset +
1374                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1375                                 return -EINVAL;
1376 
1377                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1378                         mark = 1;
1379                 }
1380         } else {
1381                 return -EINVAL;
1382         }
1383 
1384         read_lock_bh(&idev->lock);
1385         if (group_type == IPV6_ADDR_ANY) {
1386                 for (ma = idev->mc_list; ma; ma = ma->next) {
1387                         spin_lock_bh(&ma->mca_lock);
1388                         igmp6_group_queried(ma, max_delay);
1389                         spin_unlock_bh(&ma->mca_lock);
1390                 }
1391         } else {
1392                 for (ma = idev->mc_list; ma; ma = ma->next) {
1393                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1394                                 continue;
1395                         spin_lock_bh(&ma->mca_lock);
1396                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1397                                 /* gsquery <- gsquery && mark */
1398                                 if (!mark)
1399                                         ma->mca_flags &= ~MAF_GSQUERY;
1400                         } else {
1401                                 /* gsquery <- mark */
1402                                 if (mark)
1403                                         ma->mca_flags |= MAF_GSQUERY;
1404                                 else
1405                                         ma->mca_flags &= ~MAF_GSQUERY;
1406                         }
1407                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1408                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1409                                 igmp6_group_queried(ma, max_delay);
1410                         spin_unlock_bh(&ma->mca_lock);
1411                         break;
1412                 }
1413         }
1414         read_unlock_bh(&idev->lock);
1415 
1416         return 0;
1417 }
1418 
1419 /* called with rcu_read_lock() */
1420 int igmp6_event_report(struct sk_buff *skb)
1421 {
1422         struct ifmcaddr6 *ma;
1423         struct inet6_dev *idev;
1424         struct mld_msg *mld;
1425         int addr_type;
1426 
1427         /* Our own report looped back. Ignore it. */
1428         if (skb->pkt_type == PACKET_LOOPBACK)
1429                 return 0;
1430 
1431         /* send our report if the MC router may not have heard this report */
1432         if (skb->pkt_type != PACKET_MULTICAST &&
1433             skb->pkt_type != PACKET_BROADCAST)
1434                 return 0;
1435 
1436         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1437                 return -EINVAL;
1438 
1439         mld = (struct mld_msg *)icmp6_hdr(skb);
1440 
1441         /* Drop reports with not link local source */
1442         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1443         if (addr_type != IPV6_ADDR_ANY &&
1444             !(addr_type&IPV6_ADDR_LINKLOCAL))
1445                 return -EINVAL;
1446 
1447         idev = __in6_dev_get(skb->dev);
1448         if (idev == NULL)
1449                 return -ENODEV;
1450 
1451         /*
1452          *      Cancel the timer for this group
1453          */
1454 
1455         read_lock_bh(&idev->lock);
1456         for (ma = idev->mc_list; ma; ma = ma->next) {
1457                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1458                         spin_lock(&ma->mca_lock);
1459                         if (del_timer(&ma->mca_timer))
1460                                 atomic_dec(&ma->mca_refcnt);
1461                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1462                         spin_unlock(&ma->mca_lock);
1463                         break;
1464                 }
1465         }
1466         read_unlock_bh(&idev->lock);
1467         return 0;
1468 }
1469 
1470 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1471                   int gdeleted, int sdeleted)
1472 {
1473         switch (type) {
1474         case MLD2_MODE_IS_INCLUDE:
1475         case MLD2_MODE_IS_EXCLUDE:
1476                 if (gdeleted || sdeleted)
1477                         return false;
1478                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1479                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1480                                 return true;
1481                         /* don't include if this source is excluded
1482                          * in all filters
1483                          */
1484                         if (psf->sf_count[MCAST_INCLUDE])
1485                                 return type == MLD2_MODE_IS_INCLUDE;
1486                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1487                                 psf->sf_count[MCAST_EXCLUDE];
1488                 }
1489                 return false;
1490         case MLD2_CHANGE_TO_INCLUDE:
1491                 if (gdeleted || sdeleted)
1492                         return false;
1493                 return psf->sf_count[MCAST_INCLUDE] != 0;
1494         case MLD2_CHANGE_TO_EXCLUDE:
1495                 if (gdeleted || sdeleted)
1496                         return false;
1497                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1498                     psf->sf_count[MCAST_INCLUDE])
1499                         return false;
1500                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1501                         psf->sf_count[MCAST_EXCLUDE];
1502         case MLD2_ALLOW_NEW_SOURCES:
1503                 if (gdeleted || !psf->sf_crcount)
1504                         return false;
1505                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1506         case MLD2_BLOCK_OLD_SOURCES:
1507                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1508                         return gdeleted || (psf->sf_crcount && sdeleted);
1509                 return psf->sf_crcount && !gdeleted && !sdeleted;
1510         }
1511         return false;
1512 }
1513 
1514 static int
1515 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1516 {
1517         struct ip6_sf_list *psf;
1518         int scount = 0;
1519 
1520         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1521                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1522                         continue;
1523                 scount++;
1524         }
1525         return scount;
1526 }
1527 
1528 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1529                        struct net_device *dev,
1530                        const struct in6_addr *saddr,
1531                        const struct in6_addr *daddr,
1532                        int proto, int len)
1533 {
1534         struct ipv6hdr *hdr;
1535 
1536         skb->protocol = htons(ETH_P_IPV6);
1537         skb->dev = dev;
1538 
1539         skb_reset_network_header(skb);
1540         skb_put(skb, sizeof(struct ipv6hdr));
1541         hdr = ipv6_hdr(skb);
1542 
1543         ip6_flow_hdr(hdr, 0, 0);
1544 
1545         hdr->payload_len = htons(len);
1546         hdr->nexthdr = proto;
1547         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1548 
1549         hdr->saddr = *saddr;
1550         hdr->daddr = *daddr;
1551 }
1552 
1553 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1554 {
1555         struct net_device *dev = idev->dev;
1556         struct net *net = dev_net(dev);
1557         struct sock *sk = net->ipv6.igmp_sk;
1558         struct sk_buff *skb;
1559         struct mld2_report *pmr;
1560         struct in6_addr addr_buf;
1561         const struct in6_addr *saddr;
1562         int hlen = LL_RESERVED_SPACE(dev);
1563         int tlen = dev->needed_tailroom;
1564         unsigned int size = mtu + hlen + tlen;
1565         int err;
1566         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1567                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1568                      IPV6_TLV_PADN, 0 };
1569 
1570         /* we assume size > sizeof(ra) here */
1571         /* limit our allocations to order-0 page */
1572         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1573         skb = sock_alloc_send_skb(sk, size, 1, &err);
1574 
1575         if (!skb)
1576                 return NULL;
1577 
1578         skb->priority = TC_PRIO_CONTROL;
1579         skb->reserved_tailroom = skb_end_offset(skb) -
1580                                  min(mtu, skb_end_offset(skb));
1581         skb_reserve(skb, hlen);
1582 
1583         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1584                 /* <draft-ietf-magma-mld-source-05.txt>:
1585                  * use unspecified address as the source address
1586                  * when a valid link-local address is not available.
1587                  */
1588                 saddr = &in6addr_any;
1589         } else
1590                 saddr = &addr_buf;
1591 
1592         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1593 
1594         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1595 
1596         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1597         skb_put(skb, sizeof(*pmr));
1598         pmr = (struct mld2_report *)skb_transport_header(skb);
1599         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1600         pmr->mld2r_resv1 = 0;
1601         pmr->mld2r_cksum = 0;
1602         pmr->mld2r_resv2 = 0;
1603         pmr->mld2r_ngrec = 0;
1604         return skb;
1605 }
1606 
1607 static void mld_sendpack(struct sk_buff *skb)
1608 {
1609         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1610         struct mld2_report *pmr =
1611                               (struct mld2_report *)skb_transport_header(skb);
1612         int payload_len, mldlen;
1613         struct inet6_dev *idev;
1614         struct net *net = dev_net(skb->dev);
1615         int err;
1616         struct flowi6 fl6;
1617         struct dst_entry *dst;
1618 
1619         rcu_read_lock();
1620         idev = __in6_dev_get(skb->dev);
1621         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1622 
1623         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1624                 sizeof(*pip6);
1625         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1626         pip6->payload_len = htons(payload_len);
1627 
1628         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1629                                            IPPROTO_ICMPV6,
1630                                            csum_partial(skb_transport_header(skb),
1631                                                         mldlen, 0));
1632 
1633         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1634                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1635                          skb->dev->ifindex);
1636         dst = icmp6_dst_alloc(skb->dev, &fl6);
1637 
1638         err = 0;
1639         if (IS_ERR(dst)) {
1640                 err = PTR_ERR(dst);
1641                 dst = NULL;
1642         }
1643         skb_dst_set(skb, dst);
1644         if (err)
1645                 goto err_out;
1646 
1647         payload_len = skb->len;
1648 
1649         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1650                       dst_output);
1651 out:
1652         if (!err) {
1653                 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1654                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1655         } else {
1656                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1657         }
1658 
1659         rcu_read_unlock();
1660         return;
1661 
1662 err_out:
1663         kfree_skb(skb);
1664         goto out;
1665 }
1666 
1667 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1668 {
1669         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1670 }
1671 
1672 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1673         int type, struct mld2_grec **ppgr, unsigned int mtu)
1674 {
1675         struct mld2_report *pmr;
1676         struct mld2_grec *pgr;
1677 
1678         if (!skb) {
1679                 skb = mld_newpack(pmc->idev, mtu);
1680                 if (!skb)
1681                         return NULL;
1682         }
1683         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1684         pgr->grec_type = type;
1685         pgr->grec_auxwords = 0;
1686         pgr->grec_nsrcs = 0;
1687         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1688         pmr = (struct mld2_report *)skb_transport_header(skb);
1689         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1690         *ppgr = pgr;
1691         return skb;
1692 }
1693 
1694 #define AVAILABLE(skb)  ((skb) ? skb_availroom(skb) : 0)
1695 
1696 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1697         int type, int gdeleted, int sdeleted, int crsend)
1698 {
1699         struct inet6_dev *idev = pmc->idev;
1700         struct net_device *dev = idev->dev;
1701         struct mld2_report *pmr;
1702         struct mld2_grec *pgr = NULL;
1703         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1704         int scount, stotal, first, isquery, truncate;
1705         unsigned int mtu;
1706 
1707         if (pmc->mca_flags & MAF_NOREPORT)
1708                 return skb;
1709 
1710         mtu = READ_ONCE(dev->mtu);
1711         if (mtu < IPV6_MIN_MTU)
1712                 return skb;
1713 
1714         isquery = type == MLD2_MODE_IS_INCLUDE ||
1715                   type == MLD2_MODE_IS_EXCLUDE;
1716         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1717                     type == MLD2_CHANGE_TO_EXCLUDE;
1718 
1719         stotal = scount = 0;
1720 
1721         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1722 
1723         if (!*psf_list)
1724                 goto empty_source;
1725 
1726         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1727 
1728         /* EX and TO_EX get a fresh packet, if needed */
1729         if (truncate) {
1730                 if (pmr && pmr->mld2r_ngrec &&
1731                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1732                         if (skb)
1733                                 mld_sendpack(skb);
1734                         skb = mld_newpack(idev, mtu);
1735                 }
1736         }
1737         first = 1;
1738         psf_prev = NULL;
1739         for (psf = *psf_list; psf; psf = psf_next) {
1740                 struct in6_addr *psrc;
1741 
1742                 psf_next = psf->sf_next;
1743 
1744                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1745                         psf_prev = psf;
1746                         continue;
1747                 }
1748 
1749                 /* clear marks on query responses */
1750                 if (isquery)
1751                         psf->sf_gsresp = 0;
1752 
1753                 if (AVAILABLE(skb) < sizeof(*psrc) +
1754                     first*sizeof(struct mld2_grec)) {
1755                         if (truncate && !first)
1756                                 break;   /* truncate these */
1757                         if (pgr)
1758                                 pgr->grec_nsrcs = htons(scount);
1759                         if (skb)
1760                                 mld_sendpack(skb);
1761                         skb = mld_newpack(idev, mtu);
1762                         first = 1;
1763                         scount = 0;
1764                 }
1765                 if (first) {
1766                         skb = add_grhead(skb, pmc, type, &pgr, mtu);
1767                         first = 0;
1768                 }
1769                 if (!skb)
1770                         return NULL;
1771                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1772                 *psrc = psf->sf_addr;
1773                 scount++; stotal++;
1774                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1775                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1776                         psf->sf_crcount--;
1777                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1778                                 if (psf_prev)
1779                                         psf_prev->sf_next = psf->sf_next;
1780                                 else
1781                                         *psf_list = psf->sf_next;
1782                                 kfree(psf);
1783                                 continue;
1784                         }
1785                 }
1786                 psf_prev = psf;
1787         }
1788 
1789 empty_source:
1790         if (!stotal) {
1791                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1792                     type == MLD2_BLOCK_OLD_SOURCES)
1793                         return skb;
1794                 if (pmc->mca_crcount || isquery || crsend) {
1795                         /* make sure we have room for group header */
1796                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1797                                 mld_sendpack(skb);
1798                                 skb = NULL; /* add_grhead will get a new one */
1799                         }
1800                         skb = add_grhead(skb, pmc, type, &pgr, mtu);
1801                 }
1802         }
1803         if (pgr)
1804                 pgr->grec_nsrcs = htons(scount);
1805 
1806         if (isquery)
1807                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1808         return skb;
1809 }
1810 
1811 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1812 {
1813         struct sk_buff *skb = NULL;
1814         int type;
1815 
1816         read_lock_bh(&idev->lock);
1817         if (!pmc) {
1818                 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1819                         if (pmc->mca_flags & MAF_NOREPORT)
1820                                 continue;
1821                         spin_lock_bh(&pmc->mca_lock);
1822                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1823                                 type = MLD2_MODE_IS_EXCLUDE;
1824                         else
1825                                 type = MLD2_MODE_IS_INCLUDE;
1826                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1827                         spin_unlock_bh(&pmc->mca_lock);
1828                 }
1829         } else {
1830                 spin_lock_bh(&pmc->mca_lock);
1831                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1832                         type = MLD2_MODE_IS_EXCLUDE;
1833                 else
1834                         type = MLD2_MODE_IS_INCLUDE;
1835                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1836                 spin_unlock_bh(&pmc->mca_lock);
1837         }
1838         read_unlock_bh(&idev->lock);
1839         if (skb)
1840                 mld_sendpack(skb);
1841 }
1842 
1843 /*
1844  * remove zero-count source records from a source filter list
1845  */
1846 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1847 {
1848         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1849 
1850         psf_prev = NULL;
1851         for (psf = *ppsf; psf; psf = psf_next) {
1852                 psf_next = psf->sf_next;
1853                 if (psf->sf_crcount == 0) {
1854                         if (psf_prev)
1855                                 psf_prev->sf_next = psf->sf_next;
1856                         else
1857                                 *ppsf = psf->sf_next;
1858                         kfree(psf);
1859                 } else
1860                         psf_prev = psf;
1861         }
1862 }
1863 
1864 static void mld_send_cr(struct inet6_dev *idev)
1865 {
1866         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1867         struct sk_buff *skb = NULL;
1868         int type, dtype;
1869 
1870         read_lock_bh(&idev->lock);
1871         spin_lock(&idev->mc_lock);
1872 
1873         /* deleted MCA's */
1874         pmc_prev = NULL;
1875         for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1876                 pmc_next = pmc->next;
1877                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1878                         type = MLD2_BLOCK_OLD_SOURCES;
1879                         dtype = MLD2_BLOCK_OLD_SOURCES;
1880                         skb = add_grec(skb, pmc, type, 1, 0, 0);
1881                         skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1882                 }
1883                 if (pmc->mca_crcount) {
1884                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1885                                 type = MLD2_CHANGE_TO_INCLUDE;
1886                                 skb = add_grec(skb, pmc, type, 1, 0, 0);
1887                         }
1888                         pmc->mca_crcount--;
1889                         if (pmc->mca_crcount == 0) {
1890                                 mld_clear_zeros(&pmc->mca_tomb);
1891                                 mld_clear_zeros(&pmc->mca_sources);
1892                         }
1893                 }
1894                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1895                     !pmc->mca_sources) {
1896                         if (pmc_prev)
1897                                 pmc_prev->next = pmc_next;
1898                         else
1899                                 idev->mc_tomb = pmc_next;
1900                         in6_dev_put(pmc->idev);
1901                         kfree(pmc);
1902                 } else
1903                         pmc_prev = pmc;
1904         }
1905         spin_unlock(&idev->mc_lock);
1906 
1907         /* change recs */
1908         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1909                 spin_lock_bh(&pmc->mca_lock);
1910                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1911                         type = MLD2_BLOCK_OLD_SOURCES;
1912                         dtype = MLD2_ALLOW_NEW_SOURCES;
1913                 } else {
1914                         type = MLD2_ALLOW_NEW_SOURCES;
1915                         dtype = MLD2_BLOCK_OLD_SOURCES;
1916                 }
1917                 skb = add_grec(skb, pmc, type, 0, 0, 0);
1918                 skb = add_grec(skb, pmc, dtype, 0, 1, 0);       /* deleted sources */
1919 
1920                 /* filter mode changes */
1921                 if (pmc->mca_crcount) {
1922                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1923                                 type = MLD2_CHANGE_TO_EXCLUDE;
1924                         else
1925                                 type = MLD2_CHANGE_TO_INCLUDE;
1926                         skb = add_grec(skb, pmc, type, 0, 0, 0);
1927                         pmc->mca_crcount--;
1928                 }
1929                 spin_unlock_bh(&pmc->mca_lock);
1930         }
1931         read_unlock_bh(&idev->lock);
1932         if (!skb)
1933                 return;
1934         (void) mld_sendpack(skb);
1935 }
1936 
1937 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1938 {
1939         struct net *net = dev_net(dev);
1940         struct sock *sk = net->ipv6.igmp_sk;
1941         struct inet6_dev *idev;
1942         struct sk_buff *skb;
1943         struct mld_msg *hdr;
1944         const struct in6_addr *snd_addr, *saddr;
1945         struct in6_addr addr_buf;
1946         int hlen = LL_RESERVED_SPACE(dev);
1947         int tlen = dev->needed_tailroom;
1948         int err, len, payload_len, full_len;
1949         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1950                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1951                      IPV6_TLV_PADN, 0 };
1952         struct flowi6 fl6;
1953         struct dst_entry *dst;
1954 
1955         if (type == ICMPV6_MGM_REDUCTION)
1956                 snd_addr = &in6addr_linklocal_allrouters;
1957         else
1958                 snd_addr = addr;
1959 
1960         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1961         payload_len = len + sizeof(ra);
1962         full_len = sizeof(struct ipv6hdr) + payload_len;
1963 
1964         rcu_read_lock();
1965         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1966                       IPSTATS_MIB_OUT, full_len);
1967         rcu_read_unlock();
1968 
1969         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1970 
1971         if (skb == NULL) {
1972                 rcu_read_lock();
1973                 IP6_INC_STATS(net, __in6_dev_get(dev),
1974                               IPSTATS_MIB_OUTDISCARDS);
1975                 rcu_read_unlock();
1976                 return;
1977         }
1978         skb->priority = TC_PRIO_CONTROL;
1979         skb_reserve(skb, hlen);
1980 
1981         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1982                 /* <draft-ietf-magma-mld-source-05.txt>:
1983                  * use unspecified address as the source address
1984                  * when a valid link-local address is not available.
1985                  */
1986                 saddr = &in6addr_any;
1987         } else
1988                 saddr = &addr_buf;
1989 
1990         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1991 
1992         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1993 
1994         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1995         memset(hdr, 0, sizeof(struct mld_msg));
1996         hdr->mld_type = type;
1997         hdr->mld_mca = *addr;
1998 
1999         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2000                                          IPPROTO_ICMPV6,
2001                                          csum_partial(hdr, len, 0));
2002 
2003         rcu_read_lock();
2004         idev = __in6_dev_get(skb->dev);
2005 
2006         icmpv6_flow_init(sk, &fl6, type,
2007                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2008                          skb->dev->ifindex);
2009         dst = icmp6_dst_alloc(skb->dev, &fl6);
2010         if (IS_ERR(dst)) {
2011                 err = PTR_ERR(dst);
2012                 goto err_out;
2013         }
2014 
2015         skb_dst_set(skb, dst);
2016         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
2017                       dst_output);
2018 out:
2019         if (!err) {
2020                 ICMP6MSGOUT_INC_STATS(net, idev, type);
2021                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2022         } else
2023                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2024 
2025         rcu_read_unlock();
2026         return;
2027 
2028 err_out:
2029         kfree_skb(skb);
2030         goto out;
2031 }
2032 
2033 static void mld_send_initial_cr(struct inet6_dev *idev)
2034 {
2035         struct sk_buff *skb;
2036         struct ifmcaddr6 *pmc;
2037         int type;
2038 
2039         if (mld_in_v1_mode(idev))
2040                 return;
2041 
2042         skb = NULL;
2043         read_lock_bh(&idev->lock);
2044         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2045                 spin_lock_bh(&pmc->mca_lock);
2046                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2047                         type = MLD2_CHANGE_TO_EXCLUDE;
2048                 else
2049                         type = MLD2_CHANGE_TO_INCLUDE;
2050                 skb = add_grec(skb, pmc, type, 0, 0, 1);
2051                 spin_unlock_bh(&pmc->mca_lock);
2052         }
2053         read_unlock_bh(&idev->lock);
2054         if (skb)
2055                 mld_sendpack(skb);
2056 }
2057 
2058 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2059 {
2060         idev->mc_dad_count = idev->mc_qrv;
2061         if (idev->mc_dad_count) {
2062                 mld_send_initial_cr(idev);
2063                 idev->mc_dad_count--;
2064                 if (idev->mc_dad_count)
2065                         mld_dad_start_timer(idev,
2066                                             unsolicited_report_interval(idev));
2067         }
2068 }
2069 
2070 static void mld_dad_timer_expire(unsigned long data)
2071 {
2072         struct inet6_dev *idev = (struct inet6_dev *)data;
2073 
2074         mld_send_initial_cr(idev);
2075         if (idev->mc_dad_count) {
2076                 idev->mc_dad_count--;
2077                 if (idev->mc_dad_count)
2078                         mld_dad_start_timer(idev,
2079                                             unsolicited_report_interval(idev));
2080         }
2081         in6_dev_put(idev);
2082 }
2083 
2084 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2085         const struct in6_addr *psfsrc)
2086 {
2087         struct ip6_sf_list *psf, *psf_prev;
2088         int rv = 0;
2089 
2090         psf_prev = NULL;
2091         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2092                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2093                         break;
2094                 psf_prev = psf;
2095         }
2096         if (!psf || psf->sf_count[sfmode] == 0) {
2097                 /* source filter not found, or count wrong =>  bug */
2098                 return -ESRCH;
2099         }
2100         psf->sf_count[sfmode]--;
2101         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2102                 struct inet6_dev *idev = pmc->idev;
2103 
2104                 /* no more filters for this source */
2105                 if (psf_prev)
2106                         psf_prev->sf_next = psf->sf_next;
2107                 else
2108                         pmc->mca_sources = psf->sf_next;
2109                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2110                     !mld_in_v1_mode(idev)) {
2111                         psf->sf_crcount = idev->mc_qrv;
2112                         psf->sf_next = pmc->mca_tomb;
2113                         pmc->mca_tomb = psf;
2114                         rv = 1;
2115                 } else
2116                         kfree(psf);
2117         }
2118         return rv;
2119 }
2120 
2121 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2122                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2123                           int delta)
2124 {
2125         struct ifmcaddr6 *pmc;
2126         int     changerec = 0;
2127         int     i, err;
2128 
2129         if (!idev)
2130                 return -ENODEV;
2131         read_lock_bh(&idev->lock);
2132         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2133                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2134                         break;
2135         }
2136         if (!pmc) {
2137                 /* MCA not found?? bug */
2138                 read_unlock_bh(&idev->lock);
2139                 return -ESRCH;
2140         }
2141         spin_lock_bh(&pmc->mca_lock);
2142         sf_markstate(pmc);
2143         if (!delta) {
2144                 if (!pmc->mca_sfcount[sfmode]) {
2145                         spin_unlock_bh(&pmc->mca_lock);
2146                         read_unlock_bh(&idev->lock);
2147                         return -EINVAL;
2148                 }
2149                 pmc->mca_sfcount[sfmode]--;
2150         }
2151         err = 0;
2152         for (i = 0; i < sfcount; i++) {
2153                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2154 
2155                 changerec |= rv > 0;
2156                 if (!err && rv < 0)
2157                         err = rv;
2158         }
2159         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2160             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2161             pmc->mca_sfcount[MCAST_INCLUDE]) {
2162                 struct ip6_sf_list *psf;
2163 
2164                 /* filter mode change */
2165                 pmc->mca_sfmode = MCAST_INCLUDE;
2166                 pmc->mca_crcount = idev->mc_qrv;
2167                 idev->mc_ifc_count = pmc->mca_crcount;
2168                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2169                         psf->sf_crcount = 0;
2170                 mld_ifc_event(pmc->idev);
2171         } else if (sf_setstate(pmc) || changerec)
2172                 mld_ifc_event(pmc->idev);
2173         spin_unlock_bh(&pmc->mca_lock);
2174         read_unlock_bh(&idev->lock);
2175         return err;
2176 }
2177 
2178 /*
2179  * Add multicast single-source filter to the interface list
2180  */
2181 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2182         const struct in6_addr *psfsrc)
2183 {
2184         struct ip6_sf_list *psf, *psf_prev;
2185 
2186         psf_prev = NULL;
2187         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2188                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2189                         break;
2190                 psf_prev = psf;
2191         }
2192         if (!psf) {
2193                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2194                 if (!psf)
2195                         return -ENOBUFS;
2196 
2197                 psf->sf_addr = *psfsrc;
2198                 if (psf_prev) {
2199                         psf_prev->sf_next = psf;
2200                 } else
2201                         pmc->mca_sources = psf;
2202         }
2203         psf->sf_count[sfmode]++;
2204         return 0;
2205 }
2206 
2207 static void sf_markstate(struct ifmcaddr6 *pmc)
2208 {
2209         struct ip6_sf_list *psf;
2210         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2211 
2212         for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2213                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2214                         psf->sf_oldin = mca_xcount ==
2215                                 psf->sf_count[MCAST_EXCLUDE] &&
2216                                 !psf->sf_count[MCAST_INCLUDE];
2217                 } else
2218                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2219 }
2220 
2221 static int sf_setstate(struct ifmcaddr6 *pmc)
2222 {
2223         struct ip6_sf_list *psf, *dpsf;
2224         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2225         int qrv = pmc->idev->mc_qrv;
2226         int new_in, rv;
2227 
2228         rv = 0;
2229         for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2230                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2231                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2232                                 !psf->sf_count[MCAST_INCLUDE];
2233                 } else
2234                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2235                 if (new_in) {
2236                         if (!psf->sf_oldin) {
2237                                 struct ip6_sf_list *prev = NULL;
2238 
2239                                 for (dpsf = pmc->mca_tomb; dpsf;
2240                                      dpsf = dpsf->sf_next) {
2241                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2242                                             &psf->sf_addr))
2243                                                 break;
2244                                         prev = dpsf;
2245                                 }
2246                                 if (dpsf) {
2247                                         if (prev)
2248                                                 prev->sf_next = dpsf->sf_next;
2249                                         else
2250                                                 pmc->mca_tomb = dpsf->sf_next;
2251                                         kfree(dpsf);
2252                                 }
2253                                 psf->sf_crcount = qrv;
2254                                 rv++;
2255                         }
2256                 } else if (psf->sf_oldin) {
2257                         psf->sf_crcount = 0;
2258                         /*
2259                          * add or update "delete" records if an active filter
2260                          * is now inactive
2261                          */
2262                         for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2263                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2264                                     &psf->sf_addr))
2265                                         break;
2266                         if (!dpsf) {
2267                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2268                                 if (!dpsf)
2269                                         continue;
2270                                 *dpsf = *psf;
2271                                 /* pmc->mca_lock held by callers */
2272                                 dpsf->sf_next = pmc->mca_tomb;
2273                                 pmc->mca_tomb = dpsf;
2274                         }
2275                         dpsf->sf_crcount = qrv;
2276                         rv++;
2277                 }
2278         }
2279         return rv;
2280 }
2281 
2282 /*
2283  * Add multicast source filter list to the interface list
2284  */
2285 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2286                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2287                           int delta)
2288 {
2289         struct ifmcaddr6 *pmc;
2290         int     isexclude;
2291         int     i, err;
2292 
2293         if (!idev)
2294                 return -ENODEV;
2295         read_lock_bh(&idev->lock);
2296         for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2297                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2298                         break;
2299         }
2300         if (!pmc) {
2301                 /* MCA not found?? bug */
2302                 read_unlock_bh(&idev->lock);
2303                 return -ESRCH;
2304         }
2305         spin_lock_bh(&pmc->mca_lock);
2306 
2307         sf_markstate(pmc);
2308         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2309         if (!delta)
2310                 pmc->mca_sfcount[sfmode]++;
2311         err = 0;
2312         for (i = 0; i < sfcount; i++) {
2313                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2314                 if (err)
2315                         break;
2316         }
2317         if (err) {
2318                 int j;
2319 
2320                 if (!delta)
2321                         pmc->mca_sfcount[sfmode]--;
2322                 for (j = 0; j < i; j++)
2323                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2324         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2325                 struct ip6_sf_list *psf;
2326 
2327                 /* filter mode change */
2328                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2329                         pmc->mca_sfmode = MCAST_EXCLUDE;
2330                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2331                         pmc->mca_sfmode = MCAST_INCLUDE;
2332                 /* else no filters; keep old mode for reports */
2333 
2334                 pmc->mca_crcount = idev->mc_qrv;
2335                 idev->mc_ifc_count = pmc->mca_crcount;
2336                 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2337                         psf->sf_crcount = 0;
2338                 mld_ifc_event(idev);
2339         } else if (sf_setstate(pmc))
2340                 mld_ifc_event(idev);
2341         spin_unlock_bh(&pmc->mca_lock);
2342         read_unlock_bh(&idev->lock);
2343         return err;
2344 }
2345 
2346 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2347 {
2348         struct ip6_sf_list *psf, *nextpsf;
2349 
2350         for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2351                 nextpsf = psf->sf_next;
2352                 kfree(psf);
2353         }
2354         pmc->mca_tomb = NULL;
2355         for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2356                 nextpsf = psf->sf_next;
2357                 kfree(psf);
2358         }
2359         pmc->mca_sources = NULL;
2360         pmc->mca_sfmode = MCAST_EXCLUDE;
2361         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2362         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2363 }
2364 
2365 
2366 static void igmp6_join_group(struct ifmcaddr6 *ma)
2367 {
2368         unsigned long delay;
2369 
2370         if (ma->mca_flags & MAF_NOREPORT)
2371                 return;
2372 
2373         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2374 
2375         delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2376 
2377         spin_lock_bh(&ma->mca_lock);
2378         if (del_timer(&ma->mca_timer)) {
2379                 atomic_dec(&ma->mca_refcnt);
2380                 delay = ma->mca_timer.expires - jiffies;
2381         }
2382 
2383         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2384                 atomic_inc(&ma->mca_refcnt);
2385         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2386         spin_unlock_bh(&ma->mca_lock);
2387 }
2388 
2389 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2390                             struct inet6_dev *idev)
2391 {
2392         int err;
2393 
2394         write_lock_bh(&iml->sflock);
2395         if (!iml->sflist) {
2396                 /* any-source empty exclude case */
2397                 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2398         } else {
2399                 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2400                                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2401                 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2402                 iml->sflist = NULL;
2403         }
2404         write_unlock_bh(&iml->sflock);
2405         return err;
2406 }
2407 
2408 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2409 {
2410         if (mld_in_v1_mode(ma->idev)) {
2411                 if (ma->mca_flags & MAF_LAST_REPORTER)
2412                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2413                                 ICMPV6_MGM_REDUCTION);
2414         } else {
2415                 mld_add_delrec(ma->idev, ma);
2416                 mld_ifc_event(ma->idev);
2417         }
2418 }
2419 
2420 static void mld_gq_timer_expire(unsigned long data)
2421 {
2422         struct inet6_dev *idev = (struct inet6_dev *)data;
2423 
2424         idev->mc_gq_running = 0;
2425         mld_send_report(idev, NULL);
2426         in6_dev_put(idev);
2427 }
2428 
2429 static void mld_ifc_timer_expire(unsigned long data)
2430 {
2431         struct inet6_dev *idev = (struct inet6_dev *)data;
2432 
2433         mld_send_cr(idev);
2434         if (idev->mc_ifc_count) {
2435                 idev->mc_ifc_count--;
2436                 if (idev->mc_ifc_count)
2437                         mld_ifc_start_timer(idev,
2438                                             unsolicited_report_interval(idev));
2439         }
2440         in6_dev_put(idev);
2441 }
2442 
2443 static void mld_ifc_event(struct inet6_dev *idev)
2444 {
2445         if (mld_in_v1_mode(idev))
2446                 return;
2447         idev->mc_ifc_count = idev->mc_qrv;
2448         mld_ifc_start_timer(idev, 1);
2449 }
2450 
2451 
2452 static void igmp6_timer_handler(unsigned long data)
2453 {
2454         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2455 
2456         if (mld_in_v1_mode(ma->idev))
2457                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2458         else
2459                 mld_send_report(ma->idev, ma);
2460 
2461         spin_lock(&ma->mca_lock);
2462         ma->mca_flags |=  MAF_LAST_REPORTER;
2463         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2464         spin_unlock(&ma->mca_lock);
2465         ma_put(ma);
2466 }
2467 
2468 /* Device changing type */
2469 
2470 void ipv6_mc_unmap(struct inet6_dev *idev)
2471 {
2472         struct ifmcaddr6 *i;
2473 
2474         /* Install multicast list, except for all-nodes (already installed) */
2475 
2476         read_lock_bh(&idev->lock);
2477         for (i = idev->mc_list; i; i = i->next)
2478                 igmp6_group_dropped(i);
2479         read_unlock_bh(&idev->lock);
2480 }
2481 
2482 void ipv6_mc_remap(struct inet6_dev *idev)
2483 {
2484         ipv6_mc_up(idev);
2485 }
2486 
2487 /* Device going down */
2488 
2489 void ipv6_mc_down(struct inet6_dev *idev)
2490 {
2491         struct ifmcaddr6 *i;
2492 
2493         /* Withdraw multicast list */
2494 
2495         read_lock_bh(&idev->lock);
2496         mld_ifc_stop_timer(idev);
2497         mld_gq_stop_timer(idev);
2498         mld_dad_stop_timer(idev);
2499 
2500         for (i = idev->mc_list; i; i = i->next)
2501                 igmp6_group_dropped(i);
2502         read_unlock_bh(&idev->lock);
2503 
2504         mld_clear_delrec(idev);
2505 }
2506 
2507 static void ipv6_mc_reset(struct inet6_dev *idev)
2508 {
2509         idev->mc_qrv = sysctl_mld_qrv;
2510         idev->mc_qi = MLD_QI_DEFAULT;
2511         idev->mc_qri = MLD_QRI_DEFAULT;
2512         idev->mc_v1_seen = 0;
2513         idev->mc_maxdelay = unsolicited_report_interval(idev);
2514 }
2515 
2516 /* Device going up */
2517 
2518 void ipv6_mc_up(struct inet6_dev *idev)
2519 {
2520         struct ifmcaddr6 *i;
2521 
2522         /* Install multicast list, except for all-nodes (already installed) */
2523 
2524         read_lock_bh(&idev->lock);
2525         ipv6_mc_reset(idev);
2526         for (i = idev->mc_list; i; i = i->next)
2527                 igmp6_group_added(i);
2528         read_unlock_bh(&idev->lock);
2529 }
2530 
2531 /* IPv6 device initialization. */
2532 
2533 void ipv6_mc_init_dev(struct inet6_dev *idev)
2534 {
2535         write_lock_bh(&idev->lock);
2536         spin_lock_init(&idev->mc_lock);
2537         idev->mc_gq_running = 0;
2538         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2539                         (unsigned long)idev);
2540         idev->mc_tomb = NULL;
2541         idev->mc_ifc_count = 0;
2542         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2543                         (unsigned long)idev);
2544         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2545                     (unsigned long)idev);
2546         ipv6_mc_reset(idev);
2547         write_unlock_bh(&idev->lock);
2548 }
2549 
2550 /*
2551  *      Device is about to be destroyed: clean up.
2552  */
2553 
2554 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2555 {
2556         struct ifmcaddr6 *i;
2557 
2558         /* Deactivate timers */
2559         ipv6_mc_down(idev);
2560 
2561         /* Delete all-nodes address. */
2562         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2563          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2564          * fail.
2565          */
2566         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2567 
2568         if (idev->cnf.forwarding)
2569                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2570 
2571         write_lock_bh(&idev->lock);
2572         while ((i = idev->mc_list) != NULL) {
2573                 idev->mc_list = i->next;
2574                 write_unlock_bh(&idev->lock);
2575 
2576                 igmp6_group_dropped(i);
2577                 ma_put(i);
2578 
2579                 write_lock_bh(&idev->lock);
2580         }
2581         write_unlock_bh(&idev->lock);
2582 }
2583 
2584 #ifdef CONFIG_PROC_FS
2585 struct igmp6_mc_iter_state {
2586         struct seq_net_private p;
2587         struct net_device *dev;
2588         struct inet6_dev *idev;
2589 };
2590 
2591 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2592 
2593 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2594 {
2595         struct ifmcaddr6 *im = NULL;
2596         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2597         struct net *net = seq_file_net(seq);
2598 
2599         state->idev = NULL;
2600         for_each_netdev_rcu(net, state->dev) {
2601                 struct inet6_dev *idev;
2602                 idev = __in6_dev_get(state->dev);
2603                 if (!idev)
2604                         continue;
2605                 read_lock_bh(&idev->lock);
2606                 im = idev->mc_list;
2607                 if (im) {
2608                         state->idev = idev;
2609                         break;
2610                 }
2611                 read_unlock_bh(&idev->lock);
2612         }
2613         return im;
2614 }
2615 
2616 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2617 {
2618         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2619 
2620         im = im->next;
2621         while (!im) {
2622                 if (likely(state->idev != NULL))
2623                         read_unlock_bh(&state->idev->lock);
2624 
2625                 state->dev = next_net_device_rcu(state->dev);
2626                 if (!state->dev) {
2627                         state->idev = NULL;
2628                         break;
2629                 }
2630                 state->idev = __in6_dev_get(state->dev);
2631                 if (!state->idev)
2632                         continue;
2633                 read_lock_bh(&state->idev->lock);
2634                 im = state->idev->mc_list;
2635         }
2636         return im;
2637 }
2638 
2639 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2640 {
2641         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2642         if (im)
2643                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2644                         --pos;
2645         return pos ? NULL : im;
2646 }
2647 
2648 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2649         __acquires(RCU)
2650 {
2651         rcu_read_lock();
2652         return igmp6_mc_get_idx(seq, *pos);
2653 }
2654 
2655 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2656 {
2657         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2658 
2659         ++*pos;
2660         return im;
2661 }
2662 
2663 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2664         __releases(RCU)
2665 {
2666         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2667 
2668         if (likely(state->idev != NULL)) {
2669                 read_unlock_bh(&state->idev->lock);
2670                 state->idev = NULL;
2671         }
2672         state->dev = NULL;
2673         rcu_read_unlock();
2674 }
2675 
2676 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2677 {
2678         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2679         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2680 
2681         seq_printf(seq,
2682                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2683                    state->dev->ifindex, state->dev->name,
2684                    &im->mca_addr,
2685                    im->mca_users, im->mca_flags,
2686                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2687                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2688         return 0;
2689 }
2690 
2691 static const struct seq_operations igmp6_mc_seq_ops = {
2692         .start  =       igmp6_mc_seq_start,
2693         .next   =       igmp6_mc_seq_next,
2694         .stop   =       igmp6_mc_seq_stop,
2695         .show   =       igmp6_mc_seq_show,
2696 };
2697 
2698 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2699 {
2700         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2701                             sizeof(struct igmp6_mc_iter_state));
2702 }
2703 
2704 static const struct file_operations igmp6_mc_seq_fops = {
2705         .owner          =       THIS_MODULE,
2706         .open           =       igmp6_mc_seq_open,
2707         .read           =       seq_read,
2708         .llseek         =       seq_lseek,
2709         .release        =       seq_release_net,
2710 };
2711 
2712 struct igmp6_mcf_iter_state {
2713         struct seq_net_private p;
2714         struct net_device *dev;
2715         struct inet6_dev *idev;
2716         struct ifmcaddr6 *im;
2717 };
2718 
2719 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2720 
2721 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2722 {
2723         struct ip6_sf_list *psf = NULL;
2724         struct ifmcaddr6 *im = NULL;
2725         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2726         struct net *net = seq_file_net(seq);
2727 
2728         state->idev = NULL;
2729         state->im = NULL;
2730         for_each_netdev_rcu(net, state->dev) {
2731                 struct inet6_dev *idev;
2732                 idev = __in6_dev_get(state->dev);
2733                 if (unlikely(idev == NULL))
2734                         continue;
2735                 read_lock_bh(&idev->lock);
2736                 im = idev->mc_list;
2737                 if (likely(im != NULL)) {
2738                         spin_lock_bh(&im->mca_lock);
2739                         psf = im->mca_sources;
2740                         if (likely(psf != NULL)) {
2741                                 state->im = im;
2742                                 state->idev = idev;
2743                                 break;
2744                         }
2745                         spin_unlock_bh(&im->mca_lock);
2746                 }
2747                 read_unlock_bh(&idev->lock);
2748         }
2749         return psf;
2750 }
2751 
2752 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2753 {
2754         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2755 
2756         psf = psf->sf_next;
2757         while (!psf) {
2758                 spin_unlock_bh(&state->im->mca_lock);
2759                 state->im = state->im->next;
2760                 while (!state->im) {
2761                         if (likely(state->idev != NULL))
2762                                 read_unlock_bh(&state->idev->lock);
2763 
2764                         state->dev = next_net_device_rcu(state->dev);
2765                         if (!state->dev) {
2766                                 state->idev = NULL;
2767                                 goto out;
2768                         }
2769                         state->idev = __in6_dev_get(state->dev);
2770                         if (!state->idev)
2771                                 continue;
2772                         read_lock_bh(&state->idev->lock);
2773                         state->im = state->idev->mc_list;
2774                 }
2775                 if (!state->im)
2776                         break;
2777                 spin_lock_bh(&state->im->mca_lock);
2778                 psf = state->im->mca_sources;
2779         }
2780 out:
2781         return psf;
2782 }
2783 
2784 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2785 {
2786         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2787         if (psf)
2788                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2789                         --pos;
2790         return pos ? NULL : psf;
2791 }
2792 
2793 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2794         __acquires(RCU)
2795 {
2796         rcu_read_lock();
2797         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2798 }
2799 
2800 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2801 {
2802         struct ip6_sf_list *psf;
2803         if (v == SEQ_START_TOKEN)
2804                 psf = igmp6_mcf_get_first(seq);
2805         else
2806                 psf = igmp6_mcf_get_next(seq, v);
2807         ++*pos;
2808         return psf;
2809 }
2810 
2811 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2812         __releases(RCU)
2813 {
2814         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2815         if (likely(state->im != NULL)) {
2816                 spin_unlock_bh(&state->im->mca_lock);
2817                 state->im = NULL;
2818         }
2819         if (likely(state->idev != NULL)) {
2820                 read_unlock_bh(&state->idev->lock);
2821                 state->idev = NULL;
2822         }
2823         state->dev = NULL;
2824         rcu_read_unlock();
2825 }
2826 
2827 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2828 {
2829         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2830         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2831 
2832         if (v == SEQ_START_TOKEN) {
2833                 seq_printf(seq,
2834                            "%3s %6s "
2835                            "%32s %32s %6s %6s\n", "Idx",
2836                            "Device", "Multicast Address",
2837                            "Source Address", "INC", "EXC");
2838         } else {
2839                 seq_printf(seq,
2840                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2841                            state->dev->ifindex, state->dev->name,
2842                            &state->im->mca_addr,
2843                            &psf->sf_addr,
2844                            psf->sf_count[MCAST_INCLUDE],
2845                            psf->sf_count[MCAST_EXCLUDE]);
2846         }
2847         return 0;
2848 }
2849 
2850 static const struct seq_operations igmp6_mcf_seq_ops = {
2851         .start  =       igmp6_mcf_seq_start,
2852         .next   =       igmp6_mcf_seq_next,
2853         .stop   =       igmp6_mcf_seq_stop,
2854         .show   =       igmp6_mcf_seq_show,
2855 };
2856 
2857 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2858 {
2859         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2860                             sizeof(struct igmp6_mcf_iter_state));
2861 }
2862 
2863 static const struct file_operations igmp6_mcf_seq_fops = {
2864         .owner          =       THIS_MODULE,
2865         .open           =       igmp6_mcf_seq_open,
2866         .read           =       seq_read,
2867         .llseek         =       seq_lseek,
2868         .release        =       seq_release_net,
2869 };
2870 
2871 static int __net_init igmp6_proc_init(struct net *net)
2872 {
2873         int err;
2874 
2875         err = -ENOMEM;
2876         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2877                 goto out;
2878         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2879                          &igmp6_mcf_seq_fops))
2880                 goto out_proc_net_igmp6;
2881 
2882         err = 0;
2883 out:
2884         return err;
2885 
2886 out_proc_net_igmp6:
2887         remove_proc_entry("igmp6", net->proc_net);
2888         goto out;
2889 }
2890 
2891 static void __net_exit igmp6_proc_exit(struct net *net)
2892 {
2893         remove_proc_entry("mcfilter6", net->proc_net);
2894         remove_proc_entry("igmp6", net->proc_net);
2895 }
2896 #else
2897 static inline int igmp6_proc_init(struct net *net)
2898 {
2899         return 0;
2900 }
2901 static inline void igmp6_proc_exit(struct net *net)
2902 {
2903 }
2904 #endif
2905 
2906 static int __net_init igmp6_net_init(struct net *net)
2907 {
2908         int err;
2909 
2910         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2911                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2912         if (err < 0) {
2913                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2914                        err);
2915                 goto out;
2916         }
2917 
2918         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2919 
2920         err = igmp6_proc_init(net);
2921         if (err)
2922                 goto out_sock_create;
2923 out:
2924         return err;
2925 
2926 out_sock_create:
2927         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2928         goto out;
2929 }
2930 
2931 static void __net_exit igmp6_net_exit(struct net *net)
2932 {
2933         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2934         igmp6_proc_exit(net);
2935 }
2936 
2937 static struct pernet_operations igmp6_net_ops = {
2938         .init = igmp6_net_init,
2939         .exit = igmp6_net_exit,
2940 };
2941 
2942 int __init igmp6_init(void)
2943 {
2944         return register_pernet_subsys(&igmp6_net_ops);
2945 }
2946 
2947 void igmp6_cleanup(void)
2948 {
2949         unregister_pernet_subsys(&igmp6_net_ops);
2950 }
2951 

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