~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/ipv6/mcast.c

Version: ~ [ linux-5.3-rc4 ] ~ [ linux-5.2.8 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.66 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.138 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.189 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.189 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.71 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *      Multicast support for IPv6
  3  *      Linux INET6 implementation
  4  *
  5  *      Authors:
  6  *      Pedro Roque             <roque@di.fc.ul.pt>
  7  *
  8  *      Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
  9  *
 10  *      This program is free software; you can redistribute it and/or
 11  *      modify it under the terms of the GNU General Public License
 12  *      as published by the Free Software Foundation; either version
 13  *      2 of the License, or (at your option) any later version.
 14  */
 15 
 16 /* Changes:
 17  *
 18  *      yoshfuji        : fix format of router-alert option
 19  *      YOSHIFUJI Hideaki @USAGI:
 20  *              Fixed source address for MLD message based on
 21  *              <draft-ietf-magma-mld-source-05.txt>.
 22  *      YOSHIFUJI Hideaki @USAGI:
 23  *              - Ignore Queries for invalid addresses.
 24  *              - MLD for link-local addresses.
 25  *      David L Stevens <dlstevens@us.ibm.com>:
 26  *              - MLDv2 support
 27  */
 28 
 29 #include <linux/module.h>
 30 #include <linux/errno.h>
 31 #include <linux/types.h>
 32 #include <linux/string.h>
 33 #include <linux/socket.h>
 34 #include <linux/sockios.h>
 35 #include <linux/jiffies.h>
 36 #include <linux/times.h>
 37 #include <linux/net.h>
 38 #include <linux/in.h>
 39 #include <linux/in6.h>
 40 #include <linux/netdevice.h>
 41 #include <linux/if_arp.h>
 42 #include <linux/route.h>
 43 #include <linux/init.h>
 44 #include <linux/proc_fs.h>
 45 #include <linux/seq_file.h>
 46 #include <linux/slab.h>
 47 #include <net/mld.h>
 48 
 49 #include <linux/netfilter.h>
 50 #include <linux/netfilter_ipv6.h>
 51 
 52 #include <net/net_namespace.h>
 53 #include <net/sock.h>
 54 #include <net/snmp.h>
 55 
 56 #include <net/ipv6.h>
 57 #include <net/protocol.h>
 58 #include <net/if_inet6.h>
 59 #include <net/ndisc.h>
 60 #include <net/addrconf.h>
 61 #include <net/ip6_route.h>
 62 #include <net/inet_common.h>
 63 
 64 #include <net/ip6_checksum.h>
 65 
 66 /* Set to 3 to get tracing... */
 67 #define MCAST_DEBUG 2
 68 
 69 #if MCAST_DEBUG >= 3
 70 #define MDBG(x) printk x
 71 #else
 72 #define MDBG(x)
 73 #endif
 74 
 75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
 76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
 77         BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
 78         BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
 79         BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
 80 };
 81 
 82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
 83 
 84 /* Big mc list lock for all the sockets */
 85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
 86 
 87 static void igmp6_join_group(struct ifmcaddr6 *ma);
 88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
 89 static void igmp6_timer_handler(unsigned long data);
 90 
 91 static void mld_gq_timer_expire(unsigned long data);
 92 static void mld_ifc_timer_expire(unsigned long data);
 93 static void mld_ifc_event(struct inet6_dev *idev);
 94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
 95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
 96 static void mld_clear_delrec(struct inet6_dev *idev);
 97 static int sf_setstate(struct ifmcaddr6 *pmc);
 98 static void sf_markstate(struct ifmcaddr6 *pmc);
 99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
101                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
102                           int delta);
103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
104                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
105                           int delta);
106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107                             struct inet6_dev *idev);
108 
109 
110 #define IGMP6_UNSOLICITED_IVAL  (10*HZ)
111 #define MLD_QRV_DEFAULT         2
112 
113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
114                 (idev)->cnf.force_mld_version == 1 || \
115                 ((idev)->mc_v1_seen && \
116                 time_before(jiffies, (idev)->mc_v1_seen)))
117 
118 #define IPV6_MLD_MAX_MSF        64
119 
120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
121 
122 /*
123  *      socket join on multicast group
124  */
125 
126 #define for_each_pmc_rcu(np, pmc)                               \
127         for (pmc = rcu_dereference(np->ipv6_mc_list);           \
128              pmc != NULL;                                       \
129              pmc = rcu_dereference(pmc->next))
130 
131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
132 {
133         struct net_device *dev = NULL;
134         struct ipv6_mc_socklist *mc_lst;
135         struct ipv6_pinfo *np = inet6_sk(sk);
136         struct net *net = sock_net(sk);
137         int err;
138 
139         if (!ipv6_addr_is_multicast(addr))
140                 return -EINVAL;
141 
142         rcu_read_lock();
143         for_each_pmc_rcu(np, mc_lst) {
144                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145                     ipv6_addr_equal(&mc_lst->addr, addr)) {
146                         rcu_read_unlock();
147                         return -EADDRINUSE;
148                 }
149         }
150         rcu_read_unlock();
151 
152         mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
153 
154         if (mc_lst == NULL)
155                 return -ENOMEM;
156 
157         mc_lst->next = NULL;
158         mc_lst->addr = *addr;
159 
160         rcu_read_lock();
161         if (ifindex == 0) {
162                 struct rt6_info *rt;
163                 rt = rt6_lookup(net, addr, NULL, 0, 0);
164                 if (rt) {
165                         dev = rt->dst.dev;
166                         ip6_rt_put(rt);
167                 }
168         } else
169                 dev = dev_get_by_index_rcu(net, ifindex);
170 
171         if (dev == NULL) {
172                 rcu_read_unlock();
173                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174                 return -ENODEV;
175         }
176 
177         mc_lst->ifindex = dev->ifindex;
178         mc_lst->sfmode = MCAST_EXCLUDE;
179         rwlock_init(&mc_lst->sflock);
180         mc_lst->sflist = NULL;
181 
182         /*
183          *      now add/increase the group membership on the device
184          */
185 
186         err = ipv6_dev_mc_inc(dev, addr);
187 
188         if (err) {
189                 rcu_read_unlock();
190                 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191                 return err;
192         }
193 
194         spin_lock(&ipv6_sk_mc_lock);
195         mc_lst->next = np->ipv6_mc_list;
196         rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197         spin_unlock(&ipv6_sk_mc_lock);
198 
199         rcu_read_unlock();
200 
201         return 0;
202 }
203 
204 /*
205  *      socket leave on multicast group
206  */
207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 {
209         struct ipv6_pinfo *np = inet6_sk(sk);
210         struct ipv6_mc_socklist *mc_lst;
211         struct ipv6_mc_socklist __rcu **lnk;
212         struct net *net = sock_net(sk);
213 
214         if (!ipv6_addr_is_multicast(addr))
215                 return -EINVAL;
216 
217         spin_lock(&ipv6_sk_mc_lock);
218         for (lnk = &np->ipv6_mc_list;
219              (mc_lst = rcu_dereference_protected(*lnk,
220                         lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
221               lnk = &mc_lst->next) {
222                 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223                     ipv6_addr_equal(&mc_lst->addr, addr)) {
224                         struct net_device *dev;
225 
226                         *lnk = mc_lst->next;
227                         spin_unlock(&ipv6_sk_mc_lock);
228 
229                         rcu_read_lock();
230                         dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
231                         if (dev != NULL) {
232                                 struct inet6_dev *idev = __in6_dev_get(dev);
233 
234                                 (void) ip6_mc_leave_src(sk, mc_lst, idev);
235                                 if (idev)
236                                         __ipv6_dev_mc_dec(idev, &mc_lst->addr);
237                         } else
238                                 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
239                         rcu_read_unlock();
240                         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
241                         kfree_rcu(mc_lst, rcu);
242                         return 0;
243                 }
244         }
245         spin_unlock(&ipv6_sk_mc_lock);
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         spin_lock(&ipv6_sk_mc_lock);
291         while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
292                                 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
293                 struct net_device *dev;
294 
295                 np->ipv6_mc_list = mc_lst->next;
296                 spin_unlock(&ipv6_sk_mc_lock);
297 
298                 rcu_read_lock();
299                 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
300                 if (dev) {
301                         struct inet6_dev *idev = __in6_dev_get(dev);
302 
303                         (void) ip6_mc_leave_src(sk, mc_lst, idev);
304                         if (idev)
305                                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
306                 } else
307                         (void) ip6_mc_leave_src(sk, mc_lst, NULL);
308                 rcu_read_unlock();
309 
310                 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
311                 kfree_rcu(mc_lst, rcu);
312 
313                 spin_lock(&ipv6_sk_mc_lock);
314         }
315         spin_unlock(&ipv6_sk_mc_lock);
316 }
317 
318 int ip6_mc_source(int add, int omode, struct sock *sk,
319         struct group_source_req *pgsr)
320 {
321         struct in6_addr *source, *group;
322         struct ipv6_mc_socklist *pmc;
323         struct inet6_dev *idev;
324         struct ipv6_pinfo *inet6 = inet6_sk(sk);
325         struct ip6_sf_socklist *psl;
326         struct net *net = sock_net(sk);
327         int i, j, rv;
328         int leavegroup = 0;
329         int pmclocked = 0;
330         int err;
331 
332         source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
333         group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
334 
335         if (!ipv6_addr_is_multicast(group))
336                 return -EINVAL;
337 
338         rcu_read_lock();
339         idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
340         if (!idev) {
341                 rcu_read_unlock();
342                 return -ENODEV;
343         }
344 
345         err = -EADDRNOTAVAIL;
346 
347         for_each_pmc_rcu(inet6, pmc) {
348                 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
349                         continue;
350                 if (ipv6_addr_equal(&pmc->addr, group))
351                         break;
352         }
353         if (!pmc) {             /* must have a prior join */
354                 err = -EINVAL;
355                 goto done;
356         }
357         /* if a source filter was set, must be the same mode as before */
358         if (pmc->sflist) {
359                 if (pmc->sfmode != omode) {
360                         err = -EINVAL;
361                         goto done;
362                 }
363         } else if (pmc->sfmode != omode) {
364                 /* allow mode switches for empty-set filters */
365                 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
366                 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
367                 pmc->sfmode = omode;
368         }
369 
370         write_lock(&pmc->sflock);
371         pmclocked = 1;
372 
373         psl = pmc->sflist;
374         if (!add) {
375                 if (!psl)
376                         goto done;      /* err = -EADDRNOTAVAIL */
377                 rv = !0;
378                 for (i=0; i<psl->sl_count; i++) {
379                         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
380                         if (rv == 0)
381                                 break;
382                 }
383                 if (rv)         /* source not found */
384                         goto done;      /* err = -EADDRNOTAVAIL */
385 
386                 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
387                 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
388                         leavegroup = 1;
389                         goto done;
390                 }
391 
392                 /* update the interface filter */
393                 ip6_mc_del_src(idev, group, omode, 1, source, 1);
394 
395                 for (j=i+1; j<psl->sl_count; j++)
396                         psl->sl_addr[j-1] = psl->sl_addr[j];
397                 psl->sl_count--;
398                 err = 0;
399                 goto done;
400         }
401         /* else, add a new source to the filter */
402 
403         if (psl && psl->sl_count >= sysctl_mld_max_msf) {
404                 err = -ENOBUFS;
405                 goto done;
406         }
407         if (!psl || psl->sl_count == psl->sl_max) {
408                 struct ip6_sf_socklist *newpsl;
409                 int count = IP6_SFBLOCK;
410 
411                 if (psl)
412                         count += psl->sl_max;
413                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
414                 if (!newpsl) {
415                         err = -ENOBUFS;
416                         goto done;
417                 }
418                 newpsl->sl_max = count;
419                 newpsl->sl_count = count - IP6_SFBLOCK;
420                 if (psl) {
421                         for (i=0; i<psl->sl_count; i++)
422                                 newpsl->sl_addr[i] = psl->sl_addr[i];
423                         sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
424                 }
425                 pmc->sflist = psl = newpsl;
426         }
427         rv = 1; /* > 0 for insert logic below if sl_count is 0 */
428         for (i=0; i<psl->sl_count; i++) {
429                 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
430                 if (rv == 0) /* There is an error in the address. */
431                         goto done;
432         }
433         for (j=psl->sl_count-1; j>=i; j--)
434                 psl->sl_addr[j+1] = psl->sl_addr[j];
435         psl->sl_addr[i] = *source;
436         psl->sl_count++;
437         err = 0;
438         /* update the interface list */
439         ip6_mc_add_src(idev, group, omode, 1, source, 1);
440 done:
441         if (pmclocked)
442                 write_unlock(&pmc->sflock);
443         read_unlock_bh(&idev->lock);
444         rcu_read_unlock();
445         if (leavegroup)
446                 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
447         return err;
448 }
449 
450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
451 {
452         const struct in6_addr *group;
453         struct ipv6_mc_socklist *pmc;
454         struct inet6_dev *idev;
455         struct ipv6_pinfo *inet6 = inet6_sk(sk);
456         struct ip6_sf_socklist *newpsl, *psl;
457         struct net *net = sock_net(sk);
458         int leavegroup = 0;
459         int i, err;
460 
461         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
462 
463         if (!ipv6_addr_is_multicast(group))
464                 return -EINVAL;
465         if (gsf->gf_fmode != MCAST_INCLUDE &&
466             gsf->gf_fmode != MCAST_EXCLUDE)
467                 return -EINVAL;
468 
469         rcu_read_lock();
470         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
471 
472         if (!idev) {
473                 rcu_read_unlock();
474                 return -ENODEV;
475         }
476 
477         err = 0;
478 
479         if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
480                 leavegroup = 1;
481                 goto done;
482         }
483 
484         for_each_pmc_rcu(inet6, pmc) {
485                 if (pmc->ifindex != gsf->gf_interface)
486                         continue;
487                 if (ipv6_addr_equal(&pmc->addr, group))
488                         break;
489         }
490         if (!pmc) {             /* must have a prior join */
491                 err = -EINVAL;
492                 goto done;
493         }
494         if (gsf->gf_numsrc) {
495                 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
496                                                           GFP_ATOMIC);
497                 if (!newpsl) {
498                         err = -ENOBUFS;
499                         goto done;
500                 }
501                 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
502                 for (i=0; i<newpsl->sl_count; ++i) {
503                         struct sockaddr_in6 *psin6;
504 
505                         psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
506                         newpsl->sl_addr[i] = psin6->sin6_addr;
507                 }
508                 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
509                         newpsl->sl_count, newpsl->sl_addr, 0);
510                 if (err) {
511                         sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
512                         goto done;
513                 }
514         } else {
515                 newpsl = NULL;
516                 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
517         }
518 
519         write_lock(&pmc->sflock);
520         psl = pmc->sflist;
521         if (psl) {
522                 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
523                         psl->sl_count, psl->sl_addr, 0);
524                 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
525         } else
526                 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
527         pmc->sflist = newpsl;
528         pmc->sfmode = gsf->gf_fmode;
529         write_unlock(&pmc->sflock);
530         err = 0;
531 done:
532         read_unlock_bh(&idev->lock);
533         rcu_read_unlock();
534         if (leavegroup)
535                 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
536         return err;
537 }
538 
539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
540         struct group_filter __user *optval, int __user *optlen)
541 {
542         int err, i, count, copycount;
543         const struct in6_addr *group;
544         struct ipv6_mc_socklist *pmc;
545         struct inet6_dev *idev;
546         struct ipv6_pinfo *inet6 = inet6_sk(sk);
547         struct ip6_sf_socklist *psl;
548         struct net *net = sock_net(sk);
549 
550         group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
551 
552         if (!ipv6_addr_is_multicast(group))
553                 return -EINVAL;
554 
555         rcu_read_lock();
556         idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
557 
558         if (!idev) {
559                 rcu_read_unlock();
560                 return -ENODEV;
561         }
562 
563         err = -EADDRNOTAVAIL;
564         /*
565          * changes to the ipv6_mc_list require the socket lock and
566          * a read lock on ip6_sk_mc_lock. We have the socket lock,
567          * so reading the list is safe.
568          */
569 
570         for_each_pmc_rcu(inet6, pmc) {
571                 if (pmc->ifindex != gsf->gf_interface)
572                         continue;
573                 if (ipv6_addr_equal(group, &pmc->addr))
574                         break;
575         }
576         if (!pmc)               /* must have a prior join */
577                 goto done;
578         gsf->gf_fmode = pmc->sfmode;
579         psl = pmc->sflist;
580         count = psl ? psl->sl_count : 0;
581         read_unlock_bh(&idev->lock);
582         rcu_read_unlock();
583 
584         copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
585         gsf->gf_numsrc = count;
586         if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
587             copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
588                 return -EFAULT;
589         }
590         /* changes to psl require the socket lock, a read lock on
591          * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
592          * have the socket lock, so reading here is safe.
593          */
594         for (i=0; i<copycount; i++) {
595                 struct sockaddr_in6 *psin6;
596                 struct sockaddr_storage ss;
597 
598                 psin6 = (struct sockaddr_in6 *)&ss;
599                 memset(&ss, 0, sizeof(ss));
600                 psin6->sin6_family = AF_INET6;
601                 psin6->sin6_addr = psl->sl_addr[i];
602                 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
603                         return -EFAULT;
604         }
605         return 0;
606 done:
607         read_unlock_bh(&idev->lock);
608         rcu_read_unlock();
609         return err;
610 }
611 
612 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
613                     const struct in6_addr *src_addr)
614 {
615         struct ipv6_pinfo *np = inet6_sk(sk);
616         struct ipv6_mc_socklist *mc;
617         struct ip6_sf_socklist *psl;
618         bool rv = true;
619 
620         rcu_read_lock();
621         for_each_pmc_rcu(np, mc) {
622                 if (ipv6_addr_equal(&mc->addr, mc_addr))
623                         break;
624         }
625         if (!mc) {
626                 rcu_read_unlock();
627                 return true;
628         }
629         read_lock(&mc->sflock);
630         psl = mc->sflist;
631         if (!psl) {
632                 rv = mc->sfmode == MCAST_EXCLUDE;
633         } else {
634                 int i;
635 
636                 for (i=0; i<psl->sl_count; i++) {
637                         if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
638                                 break;
639                 }
640                 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
641                         rv = false;
642                 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
643                         rv = false;
644         }
645         read_unlock(&mc->sflock);
646         rcu_read_unlock();
647 
648         return rv;
649 }
650 
651 static void ma_put(struct ifmcaddr6 *mc)
652 {
653         if (atomic_dec_and_test(&mc->mca_refcnt)) {
654                 in6_dev_put(mc->idev);
655                 kfree(mc);
656         }
657 }
658 
659 static void igmp6_group_added(struct ifmcaddr6 *mc)
660 {
661         struct net_device *dev = mc->idev->dev;
662         char buf[MAX_ADDR_LEN];
663 
664         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
665             IPV6_ADDR_SCOPE_LINKLOCAL)
666                 return;
667 
668         spin_lock_bh(&mc->mca_lock);
669         if (!(mc->mca_flags&MAF_LOADED)) {
670                 mc->mca_flags |= MAF_LOADED;
671                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
672                         dev_mc_add(dev, buf);
673         }
674         spin_unlock_bh(&mc->mca_lock);
675 
676         if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
677                 return;
678 
679         if (MLD_V1_SEEN(mc->idev)) {
680                 igmp6_join_group(mc);
681                 return;
682         }
683         /* else v2 */
684 
685         mc->mca_crcount = mc->idev->mc_qrv;
686         mld_ifc_event(mc->idev);
687 }
688 
689 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
690 {
691         struct net_device *dev = mc->idev->dev;
692         char buf[MAX_ADDR_LEN];
693 
694         if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
695             IPV6_ADDR_SCOPE_LINKLOCAL)
696                 return;
697 
698         spin_lock_bh(&mc->mca_lock);
699         if (mc->mca_flags&MAF_LOADED) {
700                 mc->mca_flags &= ~MAF_LOADED;
701                 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
702                         dev_mc_del(dev, buf);
703         }
704 
705         if (mc->mca_flags & MAF_NOREPORT)
706                 goto done;
707         spin_unlock_bh(&mc->mca_lock);
708 
709         if (!mc->idev->dead)
710                 igmp6_leave_group(mc);
711 
712         spin_lock_bh(&mc->mca_lock);
713         if (del_timer(&mc->mca_timer))
714                 atomic_dec(&mc->mca_refcnt);
715 done:
716         ip6_mc_clear_src(mc);
717         spin_unlock_bh(&mc->mca_lock);
718 }
719 
720 /*
721  * deleted ifmcaddr6 manipulation
722  */
723 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
724 {
725         struct ifmcaddr6 *pmc;
726 
727         /* this is an "ifmcaddr6" for convenience; only the fields below
728          * are actually used. In particular, the refcnt and users are not
729          * used for management of the delete list. Using the same structure
730          * for deleted items allows change reports to use common code with
731          * non-deleted or query-response MCA's.
732          */
733         pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
734         if (!pmc)
735                 return;
736 
737         spin_lock_bh(&im->mca_lock);
738         spin_lock_init(&pmc->mca_lock);
739         pmc->idev = im->idev;
740         in6_dev_hold(idev);
741         pmc->mca_addr = im->mca_addr;
742         pmc->mca_crcount = idev->mc_qrv;
743         pmc->mca_sfmode = im->mca_sfmode;
744         if (pmc->mca_sfmode == MCAST_INCLUDE) {
745                 struct ip6_sf_list *psf;
746 
747                 pmc->mca_tomb = im->mca_tomb;
748                 pmc->mca_sources = im->mca_sources;
749                 im->mca_tomb = im->mca_sources = NULL;
750                 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
751                         psf->sf_crcount = pmc->mca_crcount;
752         }
753         spin_unlock_bh(&im->mca_lock);
754 
755         spin_lock_bh(&idev->mc_lock);
756         pmc->next = idev->mc_tomb;
757         idev->mc_tomb = pmc;
758         spin_unlock_bh(&idev->mc_lock);
759 }
760 
761 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
762 {
763         struct ifmcaddr6 *pmc, *pmc_prev;
764         struct ip6_sf_list *psf, *psf_next;
765 
766         spin_lock_bh(&idev->mc_lock);
767         pmc_prev = NULL;
768         for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
769                 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
770                         break;
771                 pmc_prev = pmc;
772         }
773         if (pmc) {
774                 if (pmc_prev)
775                         pmc_prev->next = pmc->next;
776                 else
777                         idev->mc_tomb = pmc->next;
778         }
779         spin_unlock_bh(&idev->mc_lock);
780 
781         if (pmc) {
782                 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
783                         psf_next = psf->sf_next;
784                         kfree(psf);
785                 }
786                 in6_dev_put(pmc->idev);
787                 kfree(pmc);
788         }
789 }
790 
791 static void mld_clear_delrec(struct inet6_dev *idev)
792 {
793         struct ifmcaddr6 *pmc, *nextpmc;
794 
795         spin_lock_bh(&idev->mc_lock);
796         pmc = idev->mc_tomb;
797         idev->mc_tomb = NULL;
798         spin_unlock_bh(&idev->mc_lock);
799 
800         for (; pmc; pmc = nextpmc) {
801                 nextpmc = pmc->next;
802                 ip6_mc_clear_src(pmc);
803                 in6_dev_put(pmc->idev);
804                 kfree(pmc);
805         }
806 
807         /* clear dead sources, too */
808         read_lock_bh(&idev->lock);
809         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
810                 struct ip6_sf_list *psf, *psf_next;
811 
812                 spin_lock_bh(&pmc->mca_lock);
813                 psf = pmc->mca_tomb;
814                 pmc->mca_tomb = NULL;
815                 spin_unlock_bh(&pmc->mca_lock);
816                 for (; psf; psf=psf_next) {
817                         psf_next = psf->sf_next;
818                         kfree(psf);
819                 }
820         }
821         read_unlock_bh(&idev->lock);
822 }
823 
824 
825 /*
826  *      device multicast group inc (add if not found)
827  */
828 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
829 {
830         struct ifmcaddr6 *mc;
831         struct inet6_dev *idev;
832 
833         /* we need to take a reference on idev */
834         idev = in6_dev_get(dev);
835 
836         if (idev == NULL)
837                 return -EINVAL;
838 
839         write_lock_bh(&idev->lock);
840         if (idev->dead) {
841                 write_unlock_bh(&idev->lock);
842                 in6_dev_put(idev);
843                 return -ENODEV;
844         }
845 
846         for (mc = idev->mc_list; mc; mc = mc->next) {
847                 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
848                         mc->mca_users++;
849                         write_unlock_bh(&idev->lock);
850                         ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
851                                 NULL, 0);
852                         in6_dev_put(idev);
853                         return 0;
854                 }
855         }
856 
857         /*
858          *      not found: create a new one.
859          */
860 
861         mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
862 
863         if (mc == NULL) {
864                 write_unlock_bh(&idev->lock);
865                 in6_dev_put(idev);
866                 return -ENOMEM;
867         }
868 
869         setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
870 
871         mc->mca_addr = *addr;
872         mc->idev = idev; /* (reference taken) */
873         mc->mca_users = 1;
874         /* mca_stamp should be updated upon changes */
875         mc->mca_cstamp = mc->mca_tstamp = jiffies;
876         atomic_set(&mc->mca_refcnt, 2);
877         spin_lock_init(&mc->mca_lock);
878 
879         /* initial mode is (EX, empty) */
880         mc->mca_sfmode = MCAST_EXCLUDE;
881         mc->mca_sfcount[MCAST_EXCLUDE] = 1;
882 
883         if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
884             IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
885                 mc->mca_flags |= MAF_NOREPORT;
886 
887         mc->next = idev->mc_list;
888         idev->mc_list = mc;
889         write_unlock_bh(&idev->lock);
890 
891         mld_del_delrec(idev, &mc->mca_addr);
892         igmp6_group_added(mc);
893         ma_put(mc);
894         return 0;
895 }
896 
897 /*
898  *      device multicast group del
899  */
900 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
901 {
902         struct ifmcaddr6 *ma, **map;
903 
904         write_lock_bh(&idev->lock);
905         for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
906                 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
907                         if (--ma->mca_users == 0) {
908                                 *map = ma->next;
909                                 write_unlock_bh(&idev->lock);
910 
911                                 igmp6_group_dropped(ma);
912 
913                                 ma_put(ma);
914                                 return 0;
915                         }
916                         write_unlock_bh(&idev->lock);
917                         return 0;
918                 }
919         }
920         write_unlock_bh(&idev->lock);
921 
922         return -ENOENT;
923 }
924 
925 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
926 {
927         struct inet6_dev *idev;
928         int err;
929 
930         rcu_read_lock();
931 
932         idev = __in6_dev_get(dev);
933         if (!idev)
934                 err = -ENODEV;
935         else
936                 err = __ipv6_dev_mc_dec(idev, addr);
937 
938         rcu_read_unlock();
939         return err;
940 }
941 
942 /*
943  *      check if the interface/address pair is valid
944  */
945 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
946                          const struct in6_addr *src_addr)
947 {
948         struct inet6_dev *idev;
949         struct ifmcaddr6 *mc;
950         bool rv = false;
951 
952         rcu_read_lock();
953         idev = __in6_dev_get(dev);
954         if (idev) {
955                 read_lock_bh(&idev->lock);
956                 for (mc = idev->mc_list; mc; mc=mc->next) {
957                         if (ipv6_addr_equal(&mc->mca_addr, group))
958                                 break;
959                 }
960                 if (mc) {
961                         if (src_addr && !ipv6_addr_any(src_addr)) {
962                                 struct ip6_sf_list *psf;
963 
964                                 spin_lock_bh(&mc->mca_lock);
965                                 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
966                                         if (ipv6_addr_equal(&psf->sf_addr, src_addr))
967                                                 break;
968                                 }
969                                 if (psf)
970                                         rv = psf->sf_count[MCAST_INCLUDE] ||
971                                                 psf->sf_count[MCAST_EXCLUDE] !=
972                                                 mc->mca_sfcount[MCAST_EXCLUDE];
973                                 else
974                                         rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
975                                 spin_unlock_bh(&mc->mca_lock);
976                         } else
977                                 rv = true; /* don't filter unspecified source */
978                 }
979                 read_unlock_bh(&idev->lock);
980         }
981         rcu_read_unlock();
982         return rv;
983 }
984 
985 static void mld_gq_start_timer(struct inet6_dev *idev)
986 {
987         int tv = net_random() % idev->mc_maxdelay;
988 
989         idev->mc_gq_running = 1;
990         if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
991                 in6_dev_hold(idev);
992 }
993 
994 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
995 {
996         int tv = net_random() % delay;
997 
998         if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
999                 in6_dev_hold(idev);
1000 }
1001 
1002 static void mld_dad_start_timer(struct inet6_dev *idev, int delay)
1003 {
1004         int tv = net_random() % delay;
1005 
1006         if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1007                 in6_dev_hold(idev);
1008 }
1009 
1010 /*
1011  *      IGMP handling (alias multicast ICMPv6 messages)
1012  */
1013 
1014 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1015 {
1016         unsigned long delay = resptime;
1017 
1018         /* Do not start timer for these addresses */
1019         if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1020             IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1021                 return;
1022 
1023         if (del_timer(&ma->mca_timer)) {
1024                 atomic_dec(&ma->mca_refcnt);
1025                 delay = ma->mca_timer.expires - jiffies;
1026         }
1027 
1028         if (delay >= resptime) {
1029                 if (resptime)
1030                         delay = net_random() % resptime;
1031                 else
1032                         delay = 1;
1033         }
1034         ma->mca_timer.expires = jiffies + delay;
1035         if (!mod_timer(&ma->mca_timer, jiffies + delay))
1036                 atomic_inc(&ma->mca_refcnt);
1037         ma->mca_flags |= MAF_TIMER_RUNNING;
1038 }
1039 
1040 /* mark EXCLUDE-mode sources */
1041 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1042                              const struct in6_addr *srcs)
1043 {
1044         struct ip6_sf_list *psf;
1045         int i, scount;
1046 
1047         scount = 0;
1048         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1049                 if (scount == nsrcs)
1050                         break;
1051                 for (i=0; i<nsrcs; i++) {
1052                         /* skip inactive filters */
1053                         if (psf->sf_count[MCAST_INCLUDE] ||
1054                             pmc->mca_sfcount[MCAST_EXCLUDE] !=
1055                             psf->sf_count[MCAST_EXCLUDE])
1056                                 break;
1057                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1058                                 scount++;
1059                                 break;
1060                         }
1061                 }
1062         }
1063         pmc->mca_flags &= ~MAF_GSQUERY;
1064         if (scount == nsrcs)    /* all sources excluded */
1065                 return false;
1066         return true;
1067 }
1068 
1069 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1070                             const struct in6_addr *srcs)
1071 {
1072         struct ip6_sf_list *psf;
1073         int i, scount;
1074 
1075         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1076                 return mld_xmarksources(pmc, nsrcs, srcs);
1077 
1078         /* mark INCLUDE-mode sources */
1079 
1080         scount = 0;
1081         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1082                 if (scount == nsrcs)
1083                         break;
1084                 for (i=0; i<nsrcs; i++) {
1085                         if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1086                                 psf->sf_gsresp = 1;
1087                                 scount++;
1088                                 break;
1089                         }
1090                 }
1091         }
1092         if (!scount) {
1093                 pmc->mca_flags &= ~MAF_GSQUERY;
1094                 return false;
1095         }
1096         pmc->mca_flags |= MAF_GSQUERY;
1097         return true;
1098 }
1099 
1100 /* called with rcu_read_lock() */
1101 int igmp6_event_query(struct sk_buff *skb)
1102 {
1103         struct mld2_query *mlh2 = NULL;
1104         struct ifmcaddr6 *ma;
1105         const struct in6_addr *group;
1106         unsigned long max_delay;
1107         struct inet6_dev *idev;
1108         struct mld_msg *mld;
1109         int group_type;
1110         int mark = 0;
1111         int len;
1112 
1113         if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1114                 return -EINVAL;
1115 
1116         /* compute payload length excluding extension headers */
1117         len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1118         len -= skb_network_header_len(skb);
1119 
1120         /* Drop queries with not link local source */
1121         if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1122                 return -EINVAL;
1123 
1124         idev = __in6_dev_get(skb->dev);
1125 
1126         if (idev == NULL)
1127                 return 0;
1128 
1129         mld = (struct mld_msg *)icmp6_hdr(skb);
1130         group = &mld->mld_mca;
1131         group_type = ipv6_addr_type(group);
1132 
1133         if (group_type != IPV6_ADDR_ANY &&
1134             !(group_type&IPV6_ADDR_MULTICAST))
1135                 return -EINVAL;
1136 
1137         if (len == 24) {
1138                 int switchback;
1139                 /* MLDv1 router present */
1140 
1141                 /* Translate milliseconds to jiffies */
1142                 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1143 
1144                 switchback = (idev->mc_qrv + 1) * max_delay;
1145                 idev->mc_v1_seen = jiffies + switchback;
1146 
1147                 /* cancel the interface change timer */
1148                 idev->mc_ifc_count = 0;
1149                 if (del_timer(&idev->mc_ifc_timer))
1150                         __in6_dev_put(idev);
1151                 /* clear deleted report items */
1152                 mld_clear_delrec(idev);
1153         } else if (len >= 28) {
1154                 int srcs_offset = sizeof(struct mld2_query) -
1155                                   sizeof(struct icmp6hdr);
1156                 if (!pskb_may_pull(skb, srcs_offset))
1157                         return -EINVAL;
1158 
1159                 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1160                 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1161                 if (!max_delay)
1162                         max_delay = 1;
1163                 idev->mc_maxdelay = max_delay;
1164                 if (mlh2->mld2q_qrv)
1165                         idev->mc_qrv = mlh2->mld2q_qrv;
1166                 if (group_type == IPV6_ADDR_ANY) { /* general query */
1167                         if (mlh2->mld2q_nsrcs)
1168                                 return -EINVAL; /* no sources allowed */
1169 
1170                         mld_gq_start_timer(idev);
1171                         return 0;
1172                 }
1173                 /* mark sources to include, if group & source-specific */
1174                 if (mlh2->mld2q_nsrcs != 0) {
1175                         if (!pskb_may_pull(skb, srcs_offset +
1176                             ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1177                                 return -EINVAL;
1178 
1179                         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1180                         mark = 1;
1181                 }
1182         } else
1183                 return -EINVAL;
1184 
1185         read_lock_bh(&idev->lock);
1186         if (group_type == IPV6_ADDR_ANY) {
1187                 for (ma = idev->mc_list; ma; ma=ma->next) {
1188                         spin_lock_bh(&ma->mca_lock);
1189                         igmp6_group_queried(ma, max_delay);
1190                         spin_unlock_bh(&ma->mca_lock);
1191                 }
1192         } else {
1193                 for (ma = idev->mc_list; ma; ma=ma->next) {
1194                         if (!ipv6_addr_equal(group, &ma->mca_addr))
1195                                 continue;
1196                         spin_lock_bh(&ma->mca_lock);
1197                         if (ma->mca_flags & MAF_TIMER_RUNNING) {
1198                                 /* gsquery <- gsquery && mark */
1199                                 if (!mark)
1200                                         ma->mca_flags &= ~MAF_GSQUERY;
1201                         } else {
1202                                 /* gsquery <- mark */
1203                                 if (mark)
1204                                         ma->mca_flags |= MAF_GSQUERY;
1205                                 else
1206                                         ma->mca_flags &= ~MAF_GSQUERY;
1207                         }
1208                         if (!(ma->mca_flags & MAF_GSQUERY) ||
1209                             mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1210                                 igmp6_group_queried(ma, max_delay);
1211                         spin_unlock_bh(&ma->mca_lock);
1212                         break;
1213                 }
1214         }
1215         read_unlock_bh(&idev->lock);
1216 
1217         return 0;
1218 }
1219 
1220 /* called with rcu_read_lock() */
1221 int igmp6_event_report(struct sk_buff *skb)
1222 {
1223         struct ifmcaddr6 *ma;
1224         struct inet6_dev *idev;
1225         struct mld_msg *mld;
1226         int addr_type;
1227 
1228         /* Our own report looped back. Ignore it. */
1229         if (skb->pkt_type == PACKET_LOOPBACK)
1230                 return 0;
1231 
1232         /* send our report if the MC router may not have heard this report */
1233         if (skb->pkt_type != PACKET_MULTICAST &&
1234             skb->pkt_type != PACKET_BROADCAST)
1235                 return 0;
1236 
1237         if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1238                 return -EINVAL;
1239 
1240         mld = (struct mld_msg *)icmp6_hdr(skb);
1241 
1242         /* Drop reports with not link local source */
1243         addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1244         if (addr_type != IPV6_ADDR_ANY &&
1245             !(addr_type&IPV6_ADDR_LINKLOCAL))
1246                 return -EINVAL;
1247 
1248         idev = __in6_dev_get(skb->dev);
1249         if (idev == NULL)
1250                 return -ENODEV;
1251 
1252         /*
1253          *      Cancel the timer for this group
1254          */
1255 
1256         read_lock_bh(&idev->lock);
1257         for (ma = idev->mc_list; ma; ma=ma->next) {
1258                 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1259                         spin_lock(&ma->mca_lock);
1260                         if (del_timer(&ma->mca_timer))
1261                                 atomic_dec(&ma->mca_refcnt);
1262                         ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1263                         spin_unlock(&ma->mca_lock);
1264                         break;
1265                 }
1266         }
1267         read_unlock_bh(&idev->lock);
1268         return 0;
1269 }
1270 
1271 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1272                   int gdeleted, int sdeleted)
1273 {
1274         switch (type) {
1275         case MLD2_MODE_IS_INCLUDE:
1276         case MLD2_MODE_IS_EXCLUDE:
1277                 if (gdeleted || sdeleted)
1278                         return false;
1279                 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1280                         if (pmc->mca_sfmode == MCAST_INCLUDE)
1281                                 return true;
1282                         /* don't include if this source is excluded
1283                          * in all filters
1284                          */
1285                         if (psf->sf_count[MCAST_INCLUDE])
1286                                 return type == MLD2_MODE_IS_INCLUDE;
1287                         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1288                                 psf->sf_count[MCAST_EXCLUDE];
1289                 }
1290                 return false;
1291         case MLD2_CHANGE_TO_INCLUDE:
1292                 if (gdeleted || sdeleted)
1293                         return false;
1294                 return psf->sf_count[MCAST_INCLUDE] != 0;
1295         case MLD2_CHANGE_TO_EXCLUDE:
1296                 if (gdeleted || sdeleted)
1297                         return false;
1298                 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1299                     psf->sf_count[MCAST_INCLUDE])
1300                         return false;
1301                 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1302                         psf->sf_count[MCAST_EXCLUDE];
1303         case MLD2_ALLOW_NEW_SOURCES:
1304                 if (gdeleted || !psf->sf_crcount)
1305                         return false;
1306                 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1307         case MLD2_BLOCK_OLD_SOURCES:
1308                 if (pmc->mca_sfmode == MCAST_INCLUDE)
1309                         return gdeleted || (psf->sf_crcount && sdeleted);
1310                 return psf->sf_crcount && !gdeleted && !sdeleted;
1311         }
1312         return false;
1313 }
1314 
1315 static int
1316 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1317 {
1318         struct ip6_sf_list *psf;
1319         int scount = 0;
1320 
1321         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1322                 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1323                         continue;
1324                 scount++;
1325         }
1326         return scount;
1327 }
1328 
1329 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1330                        struct net_device *dev,
1331                        const struct in6_addr *saddr,
1332                        const struct in6_addr *daddr,
1333                        int proto, int len)
1334 {
1335         struct ipv6hdr *hdr;
1336 
1337         skb->protocol = htons(ETH_P_IPV6);
1338         skb->dev = dev;
1339 
1340         skb_reset_network_header(skb);
1341         skb_put(skb, sizeof(struct ipv6hdr));
1342         hdr = ipv6_hdr(skb);
1343 
1344         ip6_flow_hdr(hdr, 0, 0);
1345 
1346         hdr->payload_len = htons(len);
1347         hdr->nexthdr = proto;
1348         hdr->hop_limit = inet6_sk(sk)->hop_limit;
1349 
1350         hdr->saddr = *saddr;
1351         hdr->daddr = *daddr;
1352 }
1353 
1354 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1355 {
1356         struct net_device *dev = idev->dev;
1357         struct net *net = dev_net(dev);
1358         struct sock *sk = net->ipv6.igmp_sk;
1359         struct sk_buff *skb;
1360         struct mld2_report *pmr;
1361         struct in6_addr addr_buf;
1362         const struct in6_addr *saddr;
1363         int hlen = LL_RESERVED_SPACE(dev);
1364         int tlen = dev->needed_tailroom;
1365         int err;
1366         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1367                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1368                      IPV6_TLV_PADN, 0 };
1369 
1370         /* we assume size > sizeof(ra) here */
1371         size += hlen + tlen;
1372         /* limit our allocations to order-0 page */
1373         size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1374         skb = sock_alloc_send_skb(sk, size, 1, &err);
1375 
1376         if (!skb)
1377                 return NULL;
1378 
1379         skb_reserve(skb, hlen);
1380 
1381         if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1382                 /* <draft-ietf-magma-mld-source-05.txt>:
1383                  * use unspecified address as the source address
1384                  * when a valid link-local address is not available.
1385                  */
1386                 saddr = &in6addr_any;
1387         } else
1388                 saddr = &addr_buf;
1389 
1390         ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1391 
1392         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1393 
1394         skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1395         skb_put(skb, sizeof(*pmr));
1396         pmr = (struct mld2_report *)skb_transport_header(skb);
1397         pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1398         pmr->mld2r_resv1 = 0;
1399         pmr->mld2r_cksum = 0;
1400         pmr->mld2r_resv2 = 0;
1401         pmr->mld2r_ngrec = 0;
1402         return skb;
1403 }
1404 
1405 static void mld_sendpack(struct sk_buff *skb)
1406 {
1407         struct ipv6hdr *pip6 = ipv6_hdr(skb);
1408         struct mld2_report *pmr =
1409                               (struct mld2_report *)skb_transport_header(skb);
1410         int payload_len, mldlen;
1411         struct inet6_dev *idev;
1412         struct net *net = dev_net(skb->dev);
1413         int err;
1414         struct flowi6 fl6;
1415         struct dst_entry *dst;
1416 
1417         rcu_read_lock();
1418         idev = __in6_dev_get(skb->dev);
1419         IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1420 
1421         payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1422                 sizeof(*pip6);
1423         mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1424         pip6->payload_len = htons(payload_len);
1425 
1426         pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1427                                            IPPROTO_ICMPV6,
1428                                            csum_partial(skb_transport_header(skb),
1429                                                         mldlen, 0));
1430 
1431         icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1432                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1433                          skb->dev->ifindex);
1434         dst = icmp6_dst_alloc(skb->dev, &fl6);
1435 
1436         err = 0;
1437         if (IS_ERR(dst)) {
1438                 err = PTR_ERR(dst);
1439                 dst = NULL;
1440         }
1441         skb_dst_set(skb, dst);
1442         if (err)
1443                 goto err_out;
1444 
1445         payload_len = skb->len;
1446 
1447         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1448                       dst_output);
1449 out:
1450         if (!err) {
1451                 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1452                 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1453                 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1454         } else
1455                 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1456 
1457         rcu_read_unlock();
1458         return;
1459 
1460 err_out:
1461         kfree_skb(skb);
1462         goto out;
1463 }
1464 
1465 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1466 {
1467         return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1468 }
1469 
1470 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1471         int type, struct mld2_grec **ppgr)
1472 {
1473         struct net_device *dev = pmc->idev->dev;
1474         struct mld2_report *pmr;
1475         struct mld2_grec *pgr;
1476 
1477         if (!skb)
1478                 skb = mld_newpack(pmc->idev, dev->mtu);
1479         if (!skb)
1480                 return NULL;
1481         pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1482         pgr->grec_type = type;
1483         pgr->grec_auxwords = 0;
1484         pgr->grec_nsrcs = 0;
1485         pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1486         pmr = (struct mld2_report *)skb_transport_header(skb);
1487         pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1488         *ppgr = pgr;
1489         return skb;
1490 }
1491 
1492 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1493         skb_tailroom(skb)) : 0)
1494 
1495 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1496         int type, int gdeleted, int sdeleted)
1497 {
1498         struct inet6_dev *idev = pmc->idev;
1499         struct net_device *dev = idev->dev;
1500         struct mld2_report *pmr;
1501         struct mld2_grec *pgr = NULL;
1502         struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1503         int scount, stotal, first, isquery, truncate;
1504 
1505         if (pmc->mca_flags & MAF_NOREPORT)
1506                 return skb;
1507 
1508         isquery = type == MLD2_MODE_IS_INCLUDE ||
1509                   type == MLD2_MODE_IS_EXCLUDE;
1510         truncate = type == MLD2_MODE_IS_EXCLUDE ||
1511                     type == MLD2_CHANGE_TO_EXCLUDE;
1512 
1513         stotal = scount = 0;
1514 
1515         psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1516 
1517         if (!*psf_list)
1518                 goto empty_source;
1519 
1520         pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1521 
1522         /* EX and TO_EX get a fresh packet, if needed */
1523         if (truncate) {
1524                 if (pmr && pmr->mld2r_ngrec &&
1525                     AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1526                         if (skb)
1527                                 mld_sendpack(skb);
1528                         skb = mld_newpack(idev, dev->mtu);
1529                 }
1530         }
1531         first = 1;
1532         psf_prev = NULL;
1533         for (psf=*psf_list; psf; psf=psf_next) {
1534                 struct in6_addr *psrc;
1535 
1536                 psf_next = psf->sf_next;
1537 
1538                 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1539                         psf_prev = psf;
1540                         continue;
1541                 }
1542 
1543                 /* clear marks on query responses */
1544                 if (isquery)
1545                         psf->sf_gsresp = 0;
1546 
1547                 if (AVAILABLE(skb) < sizeof(*psrc) +
1548                     first*sizeof(struct mld2_grec)) {
1549                         if (truncate && !first)
1550                                 break;   /* truncate these */
1551                         if (pgr)
1552                                 pgr->grec_nsrcs = htons(scount);
1553                         if (skb)
1554                                 mld_sendpack(skb);
1555                         skb = mld_newpack(idev, dev->mtu);
1556                         first = 1;
1557                         scount = 0;
1558                 }
1559                 if (first) {
1560                         skb = add_grhead(skb, pmc, type, &pgr);
1561                         first = 0;
1562                 }
1563                 if (!skb)
1564                         return NULL;
1565                 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1566                 *psrc = psf->sf_addr;
1567                 scount++; stotal++;
1568                 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1569                      type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1570                         psf->sf_crcount--;
1571                         if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1572                                 if (psf_prev)
1573                                         psf_prev->sf_next = psf->sf_next;
1574                                 else
1575                                         *psf_list = psf->sf_next;
1576                                 kfree(psf);
1577                                 continue;
1578                         }
1579                 }
1580                 psf_prev = psf;
1581         }
1582 
1583 empty_source:
1584         if (!stotal) {
1585                 if (type == MLD2_ALLOW_NEW_SOURCES ||
1586                     type == MLD2_BLOCK_OLD_SOURCES)
1587                         return skb;
1588                 if (pmc->mca_crcount || isquery) {
1589                         /* make sure we have room for group header */
1590                         if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1591                                 mld_sendpack(skb);
1592                                 skb = NULL; /* add_grhead will get a new one */
1593                         }
1594                         skb = add_grhead(skb, pmc, type, &pgr);
1595                 }
1596         }
1597         if (pgr)
1598                 pgr->grec_nsrcs = htons(scount);
1599 
1600         if (isquery)
1601                 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1602         return skb;
1603 }
1604 
1605 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1606 {
1607         struct sk_buff *skb = NULL;
1608         int type;
1609 
1610         read_lock_bh(&idev->lock);
1611         if (!pmc) {
1612                 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1613                         if (pmc->mca_flags & MAF_NOREPORT)
1614                                 continue;
1615                         spin_lock_bh(&pmc->mca_lock);
1616                         if (pmc->mca_sfcount[MCAST_EXCLUDE])
1617                                 type = MLD2_MODE_IS_EXCLUDE;
1618                         else
1619                                 type = MLD2_MODE_IS_INCLUDE;
1620                         skb = add_grec(skb, pmc, type, 0, 0);
1621                         spin_unlock_bh(&pmc->mca_lock);
1622                 }
1623         } else {
1624                 spin_lock_bh(&pmc->mca_lock);
1625                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1626                         type = MLD2_MODE_IS_EXCLUDE;
1627                 else
1628                         type = MLD2_MODE_IS_INCLUDE;
1629                 skb = add_grec(skb, pmc, type, 0, 0);
1630                 spin_unlock_bh(&pmc->mca_lock);
1631         }
1632         read_unlock_bh(&idev->lock);
1633         if (skb)
1634                 mld_sendpack(skb);
1635 }
1636 
1637 /*
1638  * remove zero-count source records from a source filter list
1639  */
1640 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1641 {
1642         struct ip6_sf_list *psf_prev, *psf_next, *psf;
1643 
1644         psf_prev = NULL;
1645         for (psf=*ppsf; psf; psf = psf_next) {
1646                 psf_next = psf->sf_next;
1647                 if (psf->sf_crcount == 0) {
1648                         if (psf_prev)
1649                                 psf_prev->sf_next = psf->sf_next;
1650                         else
1651                                 *ppsf = psf->sf_next;
1652                         kfree(psf);
1653                 } else
1654                         psf_prev = psf;
1655         }
1656 }
1657 
1658 static void mld_send_cr(struct inet6_dev *idev)
1659 {
1660         struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1661         struct sk_buff *skb = NULL;
1662         int type, dtype;
1663 
1664         read_lock_bh(&idev->lock);
1665         spin_lock(&idev->mc_lock);
1666 
1667         /* deleted MCA's */
1668         pmc_prev = NULL;
1669         for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1670                 pmc_next = pmc->next;
1671                 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1672                         type = MLD2_BLOCK_OLD_SOURCES;
1673                         dtype = MLD2_BLOCK_OLD_SOURCES;
1674                         skb = add_grec(skb, pmc, type, 1, 0);
1675                         skb = add_grec(skb, pmc, dtype, 1, 1);
1676                 }
1677                 if (pmc->mca_crcount) {
1678                         if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1679                                 type = MLD2_CHANGE_TO_INCLUDE;
1680                                 skb = add_grec(skb, pmc, type, 1, 0);
1681                         }
1682                         pmc->mca_crcount--;
1683                         if (pmc->mca_crcount == 0) {
1684                                 mld_clear_zeros(&pmc->mca_tomb);
1685                                 mld_clear_zeros(&pmc->mca_sources);
1686                         }
1687                 }
1688                 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1689                     !pmc->mca_sources) {
1690                         if (pmc_prev)
1691                                 pmc_prev->next = pmc_next;
1692                         else
1693                                 idev->mc_tomb = pmc_next;
1694                         in6_dev_put(pmc->idev);
1695                         kfree(pmc);
1696                 } else
1697                         pmc_prev = pmc;
1698         }
1699         spin_unlock(&idev->mc_lock);
1700 
1701         /* change recs */
1702         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1703                 spin_lock_bh(&pmc->mca_lock);
1704                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1705                         type = MLD2_BLOCK_OLD_SOURCES;
1706                         dtype = MLD2_ALLOW_NEW_SOURCES;
1707                 } else {
1708                         type = MLD2_ALLOW_NEW_SOURCES;
1709                         dtype = MLD2_BLOCK_OLD_SOURCES;
1710                 }
1711                 skb = add_grec(skb, pmc, type, 0, 0);
1712                 skb = add_grec(skb, pmc, dtype, 0, 1);  /* deleted sources */
1713 
1714                 /* filter mode changes */
1715                 if (pmc->mca_crcount) {
1716                         if (pmc->mca_sfmode == MCAST_EXCLUDE)
1717                                 type = MLD2_CHANGE_TO_EXCLUDE;
1718                         else
1719                                 type = MLD2_CHANGE_TO_INCLUDE;
1720                         skb = add_grec(skb, pmc, type, 0, 0);
1721                         pmc->mca_crcount--;
1722                 }
1723                 spin_unlock_bh(&pmc->mca_lock);
1724         }
1725         read_unlock_bh(&idev->lock);
1726         if (!skb)
1727                 return;
1728         (void) mld_sendpack(skb);
1729 }
1730 
1731 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1732 {
1733         struct net *net = dev_net(dev);
1734         struct sock *sk = net->ipv6.igmp_sk;
1735         struct inet6_dev *idev;
1736         struct sk_buff *skb;
1737         struct mld_msg *hdr;
1738         const struct in6_addr *snd_addr, *saddr;
1739         struct in6_addr addr_buf;
1740         int hlen = LL_RESERVED_SPACE(dev);
1741         int tlen = dev->needed_tailroom;
1742         int err, len, payload_len, full_len;
1743         u8 ra[8] = { IPPROTO_ICMPV6, 0,
1744                      IPV6_TLV_ROUTERALERT, 2, 0, 0,
1745                      IPV6_TLV_PADN, 0 };
1746         struct flowi6 fl6;
1747         struct dst_entry *dst;
1748 
1749         if (type == ICMPV6_MGM_REDUCTION)
1750                 snd_addr = &in6addr_linklocal_allrouters;
1751         else
1752                 snd_addr = addr;
1753 
1754         len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1755         payload_len = len + sizeof(ra);
1756         full_len = sizeof(struct ipv6hdr) + payload_len;
1757 
1758         rcu_read_lock();
1759         IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1760                       IPSTATS_MIB_OUT, full_len);
1761         rcu_read_unlock();
1762 
1763         skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1764 
1765         if (skb == NULL) {
1766                 rcu_read_lock();
1767                 IP6_INC_STATS(net, __in6_dev_get(dev),
1768                               IPSTATS_MIB_OUTDISCARDS);
1769                 rcu_read_unlock();
1770                 return;
1771         }
1772 
1773         skb_reserve(skb, hlen);
1774 
1775         if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1776                 /* <draft-ietf-magma-mld-source-05.txt>:
1777                  * use unspecified address as the source address
1778                  * when a valid link-local address is not available.
1779                  */
1780                 saddr = &in6addr_any;
1781         } else
1782                 saddr = &addr_buf;
1783 
1784         ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1785 
1786         memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1787 
1788         hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1789         memset(hdr, 0, sizeof(struct mld_msg));
1790         hdr->mld_type = type;
1791         hdr->mld_mca = *addr;
1792 
1793         hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1794                                          IPPROTO_ICMPV6,
1795                                          csum_partial(hdr, len, 0));
1796 
1797         rcu_read_lock();
1798         idev = __in6_dev_get(skb->dev);
1799 
1800         icmpv6_flow_init(sk, &fl6, type,
1801                          &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1802                          skb->dev->ifindex);
1803         dst = icmp6_dst_alloc(skb->dev, &fl6);
1804         if (IS_ERR(dst)) {
1805                 err = PTR_ERR(dst);
1806                 goto err_out;
1807         }
1808 
1809         skb_dst_set(skb, dst);
1810         err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1811                       dst_output);
1812 out:
1813         if (!err) {
1814                 ICMP6MSGOUT_INC_STATS(net, idev, type);
1815                 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1816                 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1817         } else
1818                 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1819 
1820         rcu_read_unlock();
1821         return;
1822 
1823 err_out:
1824         kfree_skb(skb);
1825         goto out;
1826 }
1827 
1828 static void mld_resend_report(struct inet6_dev *idev)
1829 {
1830         if (MLD_V1_SEEN(idev)) {
1831                 struct ifmcaddr6 *mcaddr;
1832                 read_lock_bh(&idev->lock);
1833                 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1834                         if (!(mcaddr->mca_flags & MAF_NOREPORT))
1835                                 igmp6_send(&mcaddr->mca_addr, idev->dev,
1836                                            ICMPV6_MGM_REPORT);
1837                 }
1838                 read_unlock_bh(&idev->lock);
1839         } else {
1840                 mld_send_report(idev, NULL);
1841         }
1842 }
1843 
1844 void ipv6_mc_dad_complete(struct inet6_dev *idev)
1845 {
1846         idev->mc_dad_count = idev->mc_qrv;
1847         if (idev->mc_dad_count) {
1848                 mld_resend_report(idev);
1849                 idev->mc_dad_count--;
1850                 if (idev->mc_dad_count)
1851                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1852         }
1853 }
1854 
1855 static void mld_dad_timer_expire(unsigned long data)
1856 {
1857         struct inet6_dev *idev = (struct inet6_dev *)data;
1858 
1859         mld_resend_report(idev);
1860         if (idev->mc_dad_count) {
1861                 idev->mc_dad_count--;
1862                 if (idev->mc_dad_count)
1863                         mld_dad_start_timer(idev, idev->mc_maxdelay);
1864         }
1865         in6_dev_put(idev);
1866 }
1867 
1868 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1869         const struct in6_addr *psfsrc)
1870 {
1871         struct ip6_sf_list *psf, *psf_prev;
1872         int rv = 0;
1873 
1874         psf_prev = NULL;
1875         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1876                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1877                         break;
1878                 psf_prev = psf;
1879         }
1880         if (!psf || psf->sf_count[sfmode] == 0) {
1881                 /* source filter not found, or count wrong =>  bug */
1882                 return -ESRCH;
1883         }
1884         psf->sf_count[sfmode]--;
1885         if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1886                 struct inet6_dev *idev = pmc->idev;
1887 
1888                 /* no more filters for this source */
1889                 if (psf_prev)
1890                         psf_prev->sf_next = psf->sf_next;
1891                 else
1892                         pmc->mca_sources = psf->sf_next;
1893                 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1894                     !MLD_V1_SEEN(idev)) {
1895                         psf->sf_crcount = idev->mc_qrv;
1896                         psf->sf_next = pmc->mca_tomb;
1897                         pmc->mca_tomb = psf;
1898                         rv = 1;
1899                 } else
1900                         kfree(psf);
1901         }
1902         return rv;
1903 }
1904 
1905 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1906                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
1907                           int delta)
1908 {
1909         struct ifmcaddr6 *pmc;
1910         int     changerec = 0;
1911         int     i, err;
1912 
1913         if (!idev)
1914                 return -ENODEV;
1915         read_lock_bh(&idev->lock);
1916         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1917                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1918                         break;
1919         }
1920         if (!pmc) {
1921                 /* MCA not found?? bug */
1922                 read_unlock_bh(&idev->lock);
1923                 return -ESRCH;
1924         }
1925         spin_lock_bh(&pmc->mca_lock);
1926         sf_markstate(pmc);
1927         if (!delta) {
1928                 if (!pmc->mca_sfcount[sfmode]) {
1929                         spin_unlock_bh(&pmc->mca_lock);
1930                         read_unlock_bh(&idev->lock);
1931                         return -EINVAL;
1932                 }
1933                 pmc->mca_sfcount[sfmode]--;
1934         }
1935         err = 0;
1936         for (i=0; i<sfcount; i++) {
1937                 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1938 
1939                 changerec |= rv > 0;
1940                 if (!err && rv < 0)
1941                         err = rv;
1942         }
1943         if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1944             pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1945             pmc->mca_sfcount[MCAST_INCLUDE]) {
1946                 struct ip6_sf_list *psf;
1947 
1948                 /* filter mode change */
1949                 pmc->mca_sfmode = MCAST_INCLUDE;
1950                 pmc->mca_crcount = idev->mc_qrv;
1951                 idev->mc_ifc_count = pmc->mca_crcount;
1952                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1953                         psf->sf_crcount = 0;
1954                 mld_ifc_event(pmc->idev);
1955         } else if (sf_setstate(pmc) || changerec)
1956                 mld_ifc_event(pmc->idev);
1957         spin_unlock_bh(&pmc->mca_lock);
1958         read_unlock_bh(&idev->lock);
1959         return err;
1960 }
1961 
1962 /*
1963  * Add multicast single-source filter to the interface list
1964  */
1965 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1966         const struct in6_addr *psfsrc)
1967 {
1968         struct ip6_sf_list *psf, *psf_prev;
1969 
1970         psf_prev = NULL;
1971         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1972                 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1973                         break;
1974                 psf_prev = psf;
1975         }
1976         if (!psf) {
1977                 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1978                 if (!psf)
1979                         return -ENOBUFS;
1980 
1981                 psf->sf_addr = *psfsrc;
1982                 if (psf_prev) {
1983                         psf_prev->sf_next = psf;
1984                 } else
1985                         pmc->mca_sources = psf;
1986         }
1987         psf->sf_count[sfmode]++;
1988         return 0;
1989 }
1990 
1991 static void sf_markstate(struct ifmcaddr6 *pmc)
1992 {
1993         struct ip6_sf_list *psf;
1994         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1995 
1996         for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1997                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1998                         psf->sf_oldin = mca_xcount ==
1999                                 psf->sf_count[MCAST_EXCLUDE] &&
2000                                 !psf->sf_count[MCAST_INCLUDE];
2001                 } else
2002                         psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2003 }
2004 
2005 static int sf_setstate(struct ifmcaddr6 *pmc)
2006 {
2007         struct ip6_sf_list *psf, *dpsf;
2008         int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2009         int qrv = pmc->idev->mc_qrv;
2010         int new_in, rv;
2011 
2012         rv = 0;
2013         for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2014                 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2015                         new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2016                                 !psf->sf_count[MCAST_INCLUDE];
2017                 } else
2018                         new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2019                 if (new_in) {
2020                         if (!psf->sf_oldin) {
2021                                 struct ip6_sf_list *prev = NULL;
2022 
2023                                 for (dpsf=pmc->mca_tomb; dpsf;
2024                                      dpsf=dpsf->sf_next) {
2025                                         if (ipv6_addr_equal(&dpsf->sf_addr,
2026                                             &psf->sf_addr))
2027                                                 break;
2028                                         prev = dpsf;
2029                                 }
2030                                 if (dpsf) {
2031                                         if (prev)
2032                                                 prev->sf_next = dpsf->sf_next;
2033                                         else
2034                                                 pmc->mca_tomb = dpsf->sf_next;
2035                                         kfree(dpsf);
2036                                 }
2037                                 psf->sf_crcount = qrv;
2038                                 rv++;
2039                         }
2040                 } else if (psf->sf_oldin) {
2041                         psf->sf_crcount = 0;
2042                         /*
2043                          * add or update "delete" records if an active filter
2044                          * is now inactive
2045                          */
2046                         for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2047                                 if (ipv6_addr_equal(&dpsf->sf_addr,
2048                                     &psf->sf_addr))
2049                                         break;
2050                         if (!dpsf) {
2051                                 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2052                                 if (!dpsf)
2053                                         continue;
2054                                 *dpsf = *psf;
2055                                 /* pmc->mca_lock held by callers */
2056                                 dpsf->sf_next = pmc->mca_tomb;
2057                                 pmc->mca_tomb = dpsf;
2058                         }
2059                         dpsf->sf_crcount = qrv;
2060                         rv++;
2061                 }
2062         }
2063         return rv;
2064 }
2065 
2066 /*
2067  * Add multicast source filter list to the interface list
2068  */
2069 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2070                           int sfmode, int sfcount, const struct in6_addr *psfsrc,
2071                           int delta)
2072 {
2073         struct ifmcaddr6 *pmc;
2074         int     isexclude;
2075         int     i, err;
2076 
2077         if (!idev)
2078                 return -ENODEV;
2079         read_lock_bh(&idev->lock);
2080         for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2081                 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2082                         break;
2083         }
2084         if (!pmc) {
2085                 /* MCA not found?? bug */
2086                 read_unlock_bh(&idev->lock);
2087                 return -ESRCH;
2088         }
2089         spin_lock_bh(&pmc->mca_lock);
2090 
2091         sf_markstate(pmc);
2092         isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2093         if (!delta)
2094                 pmc->mca_sfcount[sfmode]++;
2095         err = 0;
2096         for (i=0; i<sfcount; i++) {
2097                 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2098                 if (err)
2099                         break;
2100         }
2101         if (err) {
2102                 int j;
2103 
2104                 if (!delta)
2105                         pmc->mca_sfcount[sfmode]--;
2106                 for (j=0; j<i; j++)
2107                         ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2108         } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2109                 struct ip6_sf_list *psf;
2110 
2111                 /* filter mode change */
2112                 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2113                         pmc->mca_sfmode = MCAST_EXCLUDE;
2114                 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2115                         pmc->mca_sfmode = MCAST_INCLUDE;
2116                 /* else no filters; keep old mode for reports */
2117 
2118                 pmc->mca_crcount = idev->mc_qrv;
2119                 idev->mc_ifc_count = pmc->mca_crcount;
2120                 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2121                         psf->sf_crcount = 0;
2122                 mld_ifc_event(idev);
2123         } else if (sf_setstate(pmc))
2124                 mld_ifc_event(idev);
2125         spin_unlock_bh(&pmc->mca_lock);
2126         read_unlock_bh(&idev->lock);
2127         return err;
2128 }
2129 
2130 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2131 {
2132         struct ip6_sf_list *psf, *nextpsf;
2133 
2134         for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2135                 nextpsf = psf->sf_next;
2136                 kfree(psf);
2137         }
2138         pmc->mca_tomb = NULL;
2139         for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2140                 nextpsf = psf->sf_next;
2141                 kfree(psf);
2142         }
2143         pmc->mca_sources = NULL;
2144         pmc->mca_sfmode = MCAST_EXCLUDE;
2145         pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2146         pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2147 }
2148 
2149 
2150 static void igmp6_join_group(struct ifmcaddr6 *ma)
2151 {
2152         unsigned long delay;
2153 
2154         if (ma->mca_flags & MAF_NOREPORT)
2155                 return;
2156 
2157         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2158 
2159         delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2160 
2161         spin_lock_bh(&ma->mca_lock);
2162         if (del_timer(&ma->mca_timer)) {
2163                 atomic_dec(&ma->mca_refcnt);
2164                 delay = ma->mca_timer.expires - jiffies;
2165         }
2166 
2167         if (!mod_timer(&ma->mca_timer, jiffies + delay))
2168                 atomic_inc(&ma->mca_refcnt);
2169         ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2170         spin_unlock_bh(&ma->mca_lock);
2171 }
2172 
2173 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2174                             struct inet6_dev *idev)
2175 {
2176         int err;
2177 
2178         /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2179          * so no other readers or writers of iml or its sflist
2180          */
2181         if (!iml->sflist) {
2182                 /* any-source empty exclude case */
2183                 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2184         }
2185         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2186                 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2187         sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2188         iml->sflist = NULL;
2189         return err;
2190 }
2191 
2192 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2193 {
2194         if (MLD_V1_SEEN(ma->idev)) {
2195                 if (ma->mca_flags & MAF_LAST_REPORTER)
2196                         igmp6_send(&ma->mca_addr, ma->idev->dev,
2197                                 ICMPV6_MGM_REDUCTION);
2198         } else {
2199                 mld_add_delrec(ma->idev, ma);
2200                 mld_ifc_event(ma->idev);
2201         }
2202 }
2203 
2204 static void mld_gq_timer_expire(unsigned long data)
2205 {
2206         struct inet6_dev *idev = (struct inet6_dev *)data;
2207 
2208         idev->mc_gq_running = 0;
2209         mld_send_report(idev, NULL);
2210         in6_dev_put(idev);
2211 }
2212 
2213 static void mld_ifc_timer_expire(unsigned long data)
2214 {
2215         struct inet6_dev *idev = (struct inet6_dev *)data;
2216 
2217         mld_send_cr(idev);
2218         if (idev->mc_ifc_count) {
2219                 idev->mc_ifc_count--;
2220                 if (idev->mc_ifc_count)
2221                         mld_ifc_start_timer(idev, idev->mc_maxdelay);
2222         }
2223         in6_dev_put(idev);
2224 }
2225 
2226 static void mld_ifc_event(struct inet6_dev *idev)
2227 {
2228         if (MLD_V1_SEEN(idev))
2229                 return;
2230         idev->mc_ifc_count = idev->mc_qrv;
2231         mld_ifc_start_timer(idev, 1);
2232 }
2233 
2234 
2235 static void igmp6_timer_handler(unsigned long data)
2236 {
2237         struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2238 
2239         if (MLD_V1_SEEN(ma->idev))
2240                 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2241         else
2242                 mld_send_report(ma->idev, ma);
2243 
2244         spin_lock(&ma->mca_lock);
2245         ma->mca_flags |=  MAF_LAST_REPORTER;
2246         ma->mca_flags &= ~MAF_TIMER_RUNNING;
2247         spin_unlock(&ma->mca_lock);
2248         ma_put(ma);
2249 }
2250 
2251 /* Device changing type */
2252 
2253 void ipv6_mc_unmap(struct inet6_dev *idev)
2254 {
2255         struct ifmcaddr6 *i;
2256 
2257         /* Install multicast list, except for all-nodes (already installed) */
2258 
2259         read_lock_bh(&idev->lock);
2260         for (i = idev->mc_list; i; i = i->next)
2261                 igmp6_group_dropped(i);
2262         read_unlock_bh(&idev->lock);
2263 }
2264 
2265 void ipv6_mc_remap(struct inet6_dev *idev)
2266 {
2267         ipv6_mc_up(idev);
2268 }
2269 
2270 /* Device going down */
2271 
2272 void ipv6_mc_down(struct inet6_dev *idev)
2273 {
2274         struct ifmcaddr6 *i;
2275 
2276         /* Withdraw multicast list */
2277 
2278         read_lock_bh(&idev->lock);
2279         idev->mc_ifc_count = 0;
2280         if (del_timer(&idev->mc_ifc_timer))
2281                 __in6_dev_put(idev);
2282         idev->mc_gq_running = 0;
2283         if (del_timer(&idev->mc_gq_timer))
2284                 __in6_dev_put(idev);
2285         if (del_timer(&idev->mc_dad_timer))
2286                 __in6_dev_put(idev);
2287 
2288         for (i = idev->mc_list; i; i=i->next)
2289                 igmp6_group_dropped(i);
2290         read_unlock_bh(&idev->lock);
2291 
2292         mld_clear_delrec(idev);
2293 }
2294 
2295 
2296 /* Device going up */
2297 
2298 void ipv6_mc_up(struct inet6_dev *idev)
2299 {
2300         struct ifmcaddr6 *i;
2301 
2302         /* Install multicast list, except for all-nodes (already installed) */
2303 
2304         read_lock_bh(&idev->lock);
2305         for (i = idev->mc_list; i; i=i->next)
2306                 igmp6_group_added(i);
2307         read_unlock_bh(&idev->lock);
2308 }
2309 
2310 /* IPv6 device initialization. */
2311 
2312 void ipv6_mc_init_dev(struct inet6_dev *idev)
2313 {
2314         write_lock_bh(&idev->lock);
2315         spin_lock_init(&idev->mc_lock);
2316         idev->mc_gq_running = 0;
2317         setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2318                         (unsigned long)idev);
2319         idev->mc_tomb = NULL;
2320         idev->mc_ifc_count = 0;
2321         setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2322                         (unsigned long)idev);
2323         setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2324                     (unsigned long)idev);
2325         idev->mc_qrv = MLD_QRV_DEFAULT;
2326         idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2327         idev->mc_v1_seen = 0;
2328         write_unlock_bh(&idev->lock);
2329 }
2330 
2331 /*
2332  *      Device is about to be destroyed: clean up.
2333  */
2334 
2335 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2336 {
2337         struct ifmcaddr6 *i;
2338 
2339         /* Deactivate timers */
2340         ipv6_mc_down(idev);
2341 
2342         /* Delete all-nodes address. */
2343         /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2344          * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2345          * fail.
2346          */
2347         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2348 
2349         if (idev->cnf.forwarding)
2350                 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2351 
2352         write_lock_bh(&idev->lock);
2353         while ((i = idev->mc_list) != NULL) {
2354                 idev->mc_list = i->next;
2355                 write_unlock_bh(&idev->lock);
2356 
2357                 igmp6_group_dropped(i);
2358                 ma_put(i);
2359 
2360                 write_lock_bh(&idev->lock);
2361         }
2362         write_unlock_bh(&idev->lock);
2363 }
2364 
2365 #ifdef CONFIG_PROC_FS
2366 struct igmp6_mc_iter_state {
2367         struct seq_net_private p;
2368         struct net_device *dev;
2369         struct inet6_dev *idev;
2370 };
2371 
2372 #define igmp6_mc_seq_private(seq)       ((struct igmp6_mc_iter_state *)(seq)->private)
2373 
2374 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2375 {
2376         struct ifmcaddr6 *im = NULL;
2377         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2378         struct net *net = seq_file_net(seq);
2379 
2380         state->idev = NULL;
2381         for_each_netdev_rcu(net, state->dev) {
2382                 struct inet6_dev *idev;
2383                 idev = __in6_dev_get(state->dev);
2384                 if (!idev)
2385                         continue;
2386                 read_lock_bh(&idev->lock);
2387                 im = idev->mc_list;
2388                 if (im) {
2389                         state->idev = idev;
2390                         break;
2391                 }
2392                 read_unlock_bh(&idev->lock);
2393         }
2394         return im;
2395 }
2396 
2397 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2398 {
2399         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2400 
2401         im = im->next;
2402         while (!im) {
2403                 if (likely(state->idev != NULL))
2404                         read_unlock_bh(&state->idev->lock);
2405 
2406                 state->dev = next_net_device_rcu(state->dev);
2407                 if (!state->dev) {
2408                         state->idev = NULL;
2409                         break;
2410                 }
2411                 state->idev = __in6_dev_get(state->dev);
2412                 if (!state->idev)
2413                         continue;
2414                 read_lock_bh(&state->idev->lock);
2415                 im = state->idev->mc_list;
2416         }
2417         return im;
2418 }
2419 
2420 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2421 {
2422         struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2423         if (im)
2424                 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2425                         --pos;
2426         return pos ? NULL : im;
2427 }
2428 
2429 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2430         __acquires(RCU)
2431 {
2432         rcu_read_lock();
2433         return igmp6_mc_get_idx(seq, *pos);
2434 }
2435 
2436 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2437 {
2438         struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2439 
2440         ++*pos;
2441         return im;
2442 }
2443 
2444 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2445         __releases(RCU)
2446 {
2447         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2448 
2449         if (likely(state->idev != NULL)) {
2450                 read_unlock_bh(&state->idev->lock);
2451                 state->idev = NULL;
2452         }
2453         state->dev = NULL;
2454         rcu_read_unlock();
2455 }
2456 
2457 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2458 {
2459         struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2460         struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2461 
2462         seq_printf(seq,
2463                    "%-4d %-15s %pi6 %5d %08X %ld\n",
2464                    state->dev->ifindex, state->dev->name,
2465                    &im->mca_addr,
2466                    im->mca_users, im->mca_flags,
2467                    (im->mca_flags&MAF_TIMER_RUNNING) ?
2468                    jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2469         return 0;
2470 }
2471 
2472 static const struct seq_operations igmp6_mc_seq_ops = {
2473         .start  =       igmp6_mc_seq_start,
2474         .next   =       igmp6_mc_seq_next,
2475         .stop   =       igmp6_mc_seq_stop,
2476         .show   =       igmp6_mc_seq_show,
2477 };
2478 
2479 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2480 {
2481         return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2482                             sizeof(struct igmp6_mc_iter_state));
2483 }
2484 
2485 static const struct file_operations igmp6_mc_seq_fops = {
2486         .owner          =       THIS_MODULE,
2487         .open           =       igmp6_mc_seq_open,
2488         .read           =       seq_read,
2489         .llseek         =       seq_lseek,
2490         .release        =       seq_release_net,
2491 };
2492 
2493 struct igmp6_mcf_iter_state {
2494         struct seq_net_private p;
2495         struct net_device *dev;
2496         struct inet6_dev *idev;
2497         struct ifmcaddr6 *im;
2498 };
2499 
2500 #define igmp6_mcf_seq_private(seq)      ((struct igmp6_mcf_iter_state *)(seq)->private)
2501 
2502 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2503 {
2504         struct ip6_sf_list *psf = NULL;
2505         struct ifmcaddr6 *im = NULL;
2506         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2507         struct net *net = seq_file_net(seq);
2508 
2509         state->idev = NULL;
2510         state->im = NULL;
2511         for_each_netdev_rcu(net, state->dev) {
2512                 struct inet6_dev *idev;
2513                 idev = __in6_dev_get(state->dev);
2514                 if (unlikely(idev == NULL))
2515                         continue;
2516                 read_lock_bh(&idev->lock);
2517                 im = idev->mc_list;
2518                 if (likely(im != NULL)) {
2519                         spin_lock_bh(&im->mca_lock);
2520                         psf = im->mca_sources;
2521                         if (likely(psf != NULL)) {
2522                                 state->im = im;
2523                                 state->idev = idev;
2524                                 break;
2525                         }
2526                         spin_unlock_bh(&im->mca_lock);
2527                 }
2528                 read_unlock_bh(&idev->lock);
2529         }
2530         return psf;
2531 }
2532 
2533 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2534 {
2535         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2536 
2537         psf = psf->sf_next;
2538         while (!psf) {
2539                 spin_unlock_bh(&state->im->mca_lock);
2540                 state->im = state->im->next;
2541                 while (!state->im) {
2542                         if (likely(state->idev != NULL))
2543                                 read_unlock_bh(&state->idev->lock);
2544 
2545                         state->dev = next_net_device_rcu(state->dev);
2546                         if (!state->dev) {
2547                                 state->idev = NULL;
2548                                 goto out;
2549                         }
2550                         state->idev = __in6_dev_get(state->dev);
2551                         if (!state->idev)
2552                                 continue;
2553                         read_lock_bh(&state->idev->lock);
2554                         state->im = state->idev->mc_list;
2555                 }
2556                 if (!state->im)
2557                         break;
2558                 spin_lock_bh(&state->im->mca_lock);
2559                 psf = state->im->mca_sources;
2560         }
2561 out:
2562         return psf;
2563 }
2564 
2565 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2566 {
2567         struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2568         if (psf)
2569                 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2570                         --pos;
2571         return pos ? NULL : psf;
2572 }
2573 
2574 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2575         __acquires(RCU)
2576 {
2577         rcu_read_lock();
2578         return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2579 }
2580 
2581 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2582 {
2583         struct ip6_sf_list *psf;
2584         if (v == SEQ_START_TOKEN)
2585                 psf = igmp6_mcf_get_first(seq);
2586         else
2587                 psf = igmp6_mcf_get_next(seq, v);
2588         ++*pos;
2589         return psf;
2590 }
2591 
2592 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2593         __releases(RCU)
2594 {
2595         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2596         if (likely(state->im != NULL)) {
2597                 spin_unlock_bh(&state->im->mca_lock);
2598                 state->im = NULL;
2599         }
2600         if (likely(state->idev != NULL)) {
2601                 read_unlock_bh(&state->idev->lock);
2602                 state->idev = NULL;
2603         }
2604         state->dev = NULL;
2605         rcu_read_unlock();
2606 }
2607 
2608 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2609 {
2610         struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2611         struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2612 
2613         if (v == SEQ_START_TOKEN) {
2614                 seq_printf(seq,
2615                            "%3s %6s "
2616                            "%32s %32s %6s %6s\n", "Idx",
2617                            "Device", "Multicast Address",
2618                            "Source Address", "INC", "EXC");
2619         } else {
2620                 seq_printf(seq,
2621                            "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2622                            state->dev->ifindex, state->dev->name,
2623                            &state->im->mca_addr,
2624                            &psf->sf_addr,
2625                            psf->sf_count[MCAST_INCLUDE],
2626                            psf->sf_count[MCAST_EXCLUDE]);
2627         }
2628         return 0;
2629 }
2630 
2631 static const struct seq_operations igmp6_mcf_seq_ops = {
2632         .start  =       igmp6_mcf_seq_start,
2633         .next   =       igmp6_mcf_seq_next,
2634         .stop   =       igmp6_mcf_seq_stop,
2635         .show   =       igmp6_mcf_seq_show,
2636 };
2637 
2638 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2639 {
2640         return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2641                             sizeof(struct igmp6_mcf_iter_state));
2642 }
2643 
2644 static const struct file_operations igmp6_mcf_seq_fops = {
2645         .owner          =       THIS_MODULE,
2646         .open           =       igmp6_mcf_seq_open,
2647         .read           =       seq_read,
2648         .llseek         =       seq_lseek,
2649         .release        =       seq_release_net,
2650 };
2651 
2652 static int __net_init igmp6_proc_init(struct net *net)
2653 {
2654         int err;
2655 
2656         err = -ENOMEM;
2657         if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2658                 goto out;
2659         if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2660                          &igmp6_mcf_seq_fops))
2661                 goto out_proc_net_igmp6;
2662 
2663         err = 0;
2664 out:
2665         return err;
2666 
2667 out_proc_net_igmp6:
2668         remove_proc_entry("igmp6", net->proc_net);
2669         goto out;
2670 }
2671 
2672 static void __net_exit igmp6_proc_exit(struct net *net)
2673 {
2674         remove_proc_entry("mcfilter6", net->proc_net);
2675         remove_proc_entry("igmp6", net->proc_net);
2676 }
2677 #else
2678 static inline int igmp6_proc_init(struct net *net)
2679 {
2680         return 0;
2681 }
2682 static inline void igmp6_proc_exit(struct net *net)
2683 {
2684 }
2685 #endif
2686 
2687 static int __net_init igmp6_net_init(struct net *net)
2688 {
2689         int err;
2690 
2691         err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2692                                    SOCK_RAW, IPPROTO_ICMPV6, net);
2693         if (err < 0) {
2694                 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2695                        err);
2696                 goto out;
2697         }
2698 
2699         inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2700 
2701         err = igmp6_proc_init(net);
2702         if (err)
2703                 goto out_sock_create;
2704 out:
2705         return err;
2706 
2707 out_sock_create:
2708         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2709         goto out;
2710 }
2711 
2712 static void __net_exit igmp6_net_exit(struct net *net)
2713 {
2714         inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2715         igmp6_proc_exit(net);
2716 }
2717 
2718 static struct pernet_operations igmp6_net_ops = {
2719         .init = igmp6_net_init,
2720         .exit = igmp6_net_exit,
2721 };
2722 
2723 int __init igmp6_init(void)
2724 {
2725         return register_pernet_subsys(&igmp6_net_ops);
2726 }
2727 
2728 void igmp6_cleanup(void)
2729 {
2730         unregister_pernet_subsys(&igmp6_net_ops);
2731 }
2732 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp