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[pohmelfs.git] / net / ipv6 / mcast.c
blob16c33e308121da59c61629a13fa239dada189874
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 dst_release(&rt->dst);
167 }
168 } else
169 dev = dev_get_by_index_rcu(net, ifindex);
170
171 if (dev == NULL) {
172 rcu_read_unlock();
173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174 return -ENODEV;
175 }
176
177 mc_lst->ifindex = dev->ifindex;
178 mc_lst->sfmode = MCAST_EXCLUDE;
179 rwlock_init(&mc_lst->sflock);
180 mc_lst->sflist = NULL;
181
182 /*
183 * now add/increase the group membership on the device
184 */
185
186 err = ipv6_dev_mc_inc(dev, addr);
187
188 if (err) {
189 rcu_read_unlock();
190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191 return err;
192 }
193
194 spin_lock(&ipv6_sk_mc_lock);
195 mc_lst->next = np->ipv6_mc_list;
196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 spin_unlock(&ipv6_sk_mc_lock);
198
199 rcu_read_unlock();
200
201 return 0;
202 }
203
204 /*
205 * socket leave on multicast group
206 */
207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 {
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct ipv6_mc_socklist *mc_lst;
211 struct ipv6_mc_socklist __rcu **lnk;
212 struct net *net = sock_net(sk);
213
214 spin_lock(&ipv6_sk_mc_lock);
215 for (lnk = &np->ipv6_mc_list;
216 (mc_lst = rcu_dereference_protected(*lnk,
217 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
218 lnk = &mc_lst->next) {
219 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
220 ipv6_addr_equal(&mc_lst->addr, addr)) {
221 struct net_device *dev;
222
223 *lnk = mc_lst->next;
224 spin_unlock(&ipv6_sk_mc_lock);
225
226 rcu_read_lock();
227 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
228 if (dev != NULL) {
229 struct inet6_dev *idev = __in6_dev_get(dev);
230
231 (void) ip6_mc_leave_src(sk, mc_lst, idev);
232 if (idev)
233 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
234 } else
235 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
236 rcu_read_unlock();
237 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
238 kfree_rcu(mc_lst, rcu);
239 return 0;
240 }
241 }
242 spin_unlock(&ipv6_sk_mc_lock);
243
244 return -EADDRNOTAVAIL;
245 }
246
247 /* called with rcu_read_lock() */
248 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
249 const struct in6_addr *group,
250 int ifindex)
251 {
252 struct net_device *dev = NULL;
253 struct inet6_dev *idev = NULL;
254
255 if (ifindex == 0) {
256 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
257
258 if (rt) {
259 dev = rt->dst.dev;
260 dst_release(&rt->dst);
261 }
262 } else
263 dev = dev_get_by_index_rcu(net, ifindex);
264
265 if (!dev)
266 return NULL;
267 idev = __in6_dev_get(dev);
268 if (!idev)
269 return NULL;
270 read_lock_bh(&idev->lock);
271 if (idev->dead) {
272 read_unlock_bh(&idev->lock);
273 return NULL;
274 }
275 return idev;
276 }
277
278 void ipv6_sock_mc_close(struct sock *sk)
279 {
280 struct ipv6_pinfo *np = inet6_sk(sk);
281 struct ipv6_mc_socklist *mc_lst;
282 struct net *net = sock_net(sk);
283
284 spin_lock(&ipv6_sk_mc_lock);
285 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
286 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
287 struct net_device *dev;
288
289 np->ipv6_mc_list = mc_lst->next;
290 spin_unlock(&ipv6_sk_mc_lock);
291
292 rcu_read_lock();
293 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
294 if (dev) {
295 struct inet6_dev *idev = __in6_dev_get(dev);
296
297 (void) ip6_mc_leave_src(sk, mc_lst, idev);
298 if (idev)
299 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
300 } else
301 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
302 rcu_read_unlock();
303
304 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
305 kfree_rcu(mc_lst, rcu);
306
307 spin_lock(&ipv6_sk_mc_lock);
308 }
309 spin_unlock(&ipv6_sk_mc_lock);
310 }
311
312 int ip6_mc_source(int add, int omode, struct sock *sk,
313 struct group_source_req *pgsr)
314 {
315 struct in6_addr *source, *group;
316 struct ipv6_mc_socklist *pmc;
317 struct inet6_dev *idev;
318 struct ipv6_pinfo *inet6 = inet6_sk(sk);
319 struct ip6_sf_socklist *psl;
320 struct net *net = sock_net(sk);
321 int i, j, rv;
322 int leavegroup = 0;
323 int pmclocked = 0;
324 int err;
325
326 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
327 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
328
329 if (!ipv6_addr_is_multicast(group))
330 return -EINVAL;
331
332 rcu_read_lock();
333 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
334 if (!idev) {
335 rcu_read_unlock();
336 return -ENODEV;
337 }
338
339 err = -EADDRNOTAVAIL;
340
341 for_each_pmc_rcu(inet6, pmc) {
342 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
343 continue;
344 if (ipv6_addr_equal(&pmc->addr, group))
345 break;
346 }
347 if (!pmc) { /* must have a prior join */
348 err = -EINVAL;
349 goto done;
350 }
351 /* if a source filter was set, must be the same mode as before */
352 if (pmc->sflist) {
353 if (pmc->sfmode != omode) {
354 err = -EINVAL;
355 goto done;
356 }
357 } else if (pmc->sfmode != omode) {
358 /* allow mode switches for empty-set filters */
359 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
360 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
361 pmc->sfmode = omode;
362 }
363
364 write_lock(&pmc->sflock);
365 pmclocked = 1;
366
367 psl = pmc->sflist;
368 if (!add) {
369 if (!psl)
370 goto done; /* err = -EADDRNOTAVAIL */
371 rv = !0;
372 for (i=0; i<psl->sl_count; i++) {
373 rv = memcmp(&psl->sl_addr[i], source,
374 sizeof(struct in6_addr));
375 if (rv == 0)
376 break;
377 }
378 if (rv) /* source not found */
379 goto done; /* err = -EADDRNOTAVAIL */
380
381 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
382 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
383 leavegroup = 1;
384 goto done;
385 }
386
387 /* update the interface filter */
388 ip6_mc_del_src(idev, group, omode, 1, source, 1);
389
390 for (j=i+1; j<psl->sl_count; j++)
391 psl->sl_addr[j-1] = psl->sl_addr[j];
392 psl->sl_count--;
393 err = 0;
394 goto done;
395 }
396 /* else, add a new source to the filter */
397
398 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
399 err = -ENOBUFS;
400 goto done;
401 }
402 if (!psl || psl->sl_count == psl->sl_max) {
403 struct ip6_sf_socklist *newpsl;
404 int count = IP6_SFBLOCK;
405
406 if (psl)
407 count += psl->sl_max;
408 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
409 if (!newpsl) {
410 err = -ENOBUFS;
411 goto done;
412 }
413 newpsl->sl_max = count;
414 newpsl->sl_count = count - IP6_SFBLOCK;
415 if (psl) {
416 for (i=0; i<psl->sl_count; i++)
417 newpsl->sl_addr[i] = psl->sl_addr[i];
418 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
419 }
420 pmc->sflist = psl = newpsl;
421 }
422 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
423 for (i=0; i<psl->sl_count; i++) {
424 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
425 if (rv == 0)
426 break;
427 }
428 if (rv == 0) /* address already there is an error */
429 goto done;
430 for (j=psl->sl_count-1; j>=i; j--)
431 psl->sl_addr[j+1] = psl->sl_addr[j];
432 psl->sl_addr[i] = *source;
433 psl->sl_count++;
434 err = 0;
435 /* update the interface list */
436 ip6_mc_add_src(idev, group, omode, 1, source, 1);
437 done:
438 if (pmclocked)
439 write_unlock(&pmc->sflock);
440 read_unlock_bh(&idev->lock);
441 rcu_read_unlock();
442 if (leavegroup)
443 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
444 return err;
445 }
446
447 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
448 {
449 const struct in6_addr *group;
450 struct ipv6_mc_socklist *pmc;
451 struct inet6_dev *idev;
452 struct ipv6_pinfo *inet6 = inet6_sk(sk);
453 struct ip6_sf_socklist *newpsl, *psl;
454 struct net *net = sock_net(sk);
455 int leavegroup = 0;
456 int i, err;
457
458 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
459
460 if (!ipv6_addr_is_multicast(group))
461 return -EINVAL;
462 if (gsf->gf_fmode != MCAST_INCLUDE &&
463 gsf->gf_fmode != MCAST_EXCLUDE)
464 return -EINVAL;
465
466 rcu_read_lock();
467 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
468
469 if (!idev) {
470 rcu_read_unlock();
471 return -ENODEV;
472 }
473
474 err = 0;
475
476 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
477 leavegroup = 1;
478 goto done;
479 }
480
481 for_each_pmc_rcu(inet6, pmc) {
482 if (pmc->ifindex != gsf->gf_interface)
483 continue;
484 if (ipv6_addr_equal(&pmc->addr, group))
485 break;
486 }
487 if (!pmc) { /* must have a prior join */
488 err = -EINVAL;
489 goto done;
490 }
491 if (gsf->gf_numsrc) {
492 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
493 GFP_ATOMIC);
494 if (!newpsl) {
495 err = -ENOBUFS;
496 goto done;
497 }
498 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
499 for (i=0; i<newpsl->sl_count; ++i) {
500 struct sockaddr_in6 *psin6;
501
502 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
503 newpsl->sl_addr[i] = psin6->sin6_addr;
504 }
505 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
506 newpsl->sl_count, newpsl->sl_addr, 0);
507 if (err) {
508 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
509 goto done;
510 }
511 } else {
512 newpsl = NULL;
513 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
514 }
515
516 write_lock(&pmc->sflock);
517 psl = pmc->sflist;
518 if (psl) {
519 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
520 psl->sl_count, psl->sl_addr, 0);
521 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
522 } else
523 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
524 pmc->sflist = newpsl;
525 pmc->sfmode = gsf->gf_fmode;
526 write_unlock(&pmc->sflock);
527 err = 0;
528 done:
529 read_unlock_bh(&idev->lock);
530 rcu_read_unlock();
531 if (leavegroup)
532 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
533 return err;
534 }
535
536 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
537 struct group_filter __user *optval, int __user *optlen)
538 {
539 int err, i, count, copycount;
540 const struct in6_addr *group;
541 struct ipv6_mc_socklist *pmc;
542 struct inet6_dev *idev;
543 struct ipv6_pinfo *inet6 = inet6_sk(sk);
544 struct ip6_sf_socklist *psl;
545 struct net *net = sock_net(sk);
546
547 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
548
549 if (!ipv6_addr_is_multicast(group))
550 return -EINVAL;
551
552 rcu_read_lock();
553 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
554
555 if (!idev) {
556 rcu_read_unlock();
557 return -ENODEV;
558 }
559
560 err = -EADDRNOTAVAIL;
561 /*
562 * changes to the ipv6_mc_list require the socket lock and
563 * a read lock on ip6_sk_mc_lock. We have the socket lock,
564 * so reading the list is safe.
565 */
566
567 for_each_pmc_rcu(inet6, pmc) {
568 if (pmc->ifindex != gsf->gf_interface)
569 continue;
570 if (ipv6_addr_equal(group, &pmc->addr))
571 break;
572 }
573 if (!pmc) /* must have a prior join */
574 goto done;
575 gsf->gf_fmode = pmc->sfmode;
576 psl = pmc->sflist;
577 count = psl ? psl->sl_count : 0;
578 read_unlock_bh(&idev->lock);
579 rcu_read_unlock();
580
581 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
582 gsf->gf_numsrc = count;
583 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
584 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
585 return -EFAULT;
586 }
587 /* changes to psl require the socket lock, a read lock on
588 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
589 * have the socket lock, so reading here is safe.
590 */
591 for (i=0; i<copycount; i++) {
592 struct sockaddr_in6 *psin6;
593 struct sockaddr_storage ss;
594
595 psin6 = (struct sockaddr_in6 *)&ss;
596 memset(&ss, 0, sizeof(ss));
597 psin6->sin6_family = AF_INET6;
598 psin6->sin6_addr = psl->sl_addr[i];
599 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
600 return -EFAULT;
601 }
602 return 0;
603 done:
604 read_unlock_bh(&idev->lock);
605 rcu_read_unlock();
606 return err;
607 }
608
609 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
610 const struct in6_addr *src_addr)
611 {
612 struct ipv6_pinfo *np = inet6_sk(sk);
613 struct ipv6_mc_socklist *mc;
614 struct ip6_sf_socklist *psl;
615 int rv = 1;
616
617 rcu_read_lock();
618 for_each_pmc_rcu(np, mc) {
619 if (ipv6_addr_equal(&mc->addr, mc_addr))
620 break;
621 }
622 if (!mc) {
623 rcu_read_unlock();
624 return 1;
625 }
626 read_lock(&mc->sflock);
627 psl = mc->sflist;
628 if (!psl) {
629 rv = mc->sfmode == MCAST_EXCLUDE;
630 } else {
631 int i;
632
633 for (i=0; i<psl->sl_count; i++) {
634 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
635 break;
636 }
637 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
638 rv = 0;
639 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
640 rv = 0;
641 }
642 read_unlock(&mc->sflock);
643 rcu_read_unlock();
644
645 return rv;
646 }
647
648 static void ma_put(struct ifmcaddr6 *mc)
649 {
650 if (atomic_dec_and_test(&mc->mca_refcnt)) {
651 in6_dev_put(mc->idev);
652 kfree(mc);
653 }
654 }
655
656 static void igmp6_group_added(struct ifmcaddr6 *mc)
657 {
658 struct net_device *dev = mc->idev->dev;
659 char buf[MAX_ADDR_LEN];
660
661 spin_lock_bh(&mc->mca_lock);
662 if (!(mc->mca_flags&MAF_LOADED)) {
663 mc->mca_flags |= MAF_LOADED;
664 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
665 dev_mc_add(dev, buf);
666 }
667 spin_unlock_bh(&mc->mca_lock);
668
669 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
670 return;
671
672 if (MLD_V1_SEEN(mc->idev)) {
673 igmp6_join_group(mc);
674 return;
675 }
676 /* else v2 */
677
678 mc->mca_crcount = mc->idev->mc_qrv;
679 mld_ifc_event(mc->idev);
680 }
681
682 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
683 {
684 struct net_device *dev = mc->idev->dev;
685 char buf[MAX_ADDR_LEN];
686
687 spin_lock_bh(&mc->mca_lock);
688 if (mc->mca_flags&MAF_LOADED) {
689 mc->mca_flags &= ~MAF_LOADED;
690 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
691 dev_mc_del(dev, buf);
692 }
693
694 if (mc->mca_flags & MAF_NOREPORT)
695 goto done;
696 spin_unlock_bh(&mc->mca_lock);
697
698 if (!mc->idev->dead)
699 igmp6_leave_group(mc);
700
701 spin_lock_bh(&mc->mca_lock);
702 if (del_timer(&mc->mca_timer))
703 atomic_dec(&mc->mca_refcnt);
704 done:
705 ip6_mc_clear_src(mc);
706 spin_unlock_bh(&mc->mca_lock);
707 }
708
709 /*
710 * deleted ifmcaddr6 manipulation
711 */
712 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
713 {
714 struct ifmcaddr6 *pmc;
715
716 /* this is an "ifmcaddr6" for convenience; only the fields below
717 * are actually used. In particular, the refcnt and users are not
718 * used for management of the delete list. Using the same structure
719 * for deleted items allows change reports to use common code with
720 * non-deleted or query-response MCA's.
721 */
722 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
723 if (!pmc)
724 return;
725
726 spin_lock_bh(&im->mca_lock);
727 spin_lock_init(&pmc->mca_lock);
728 pmc->idev = im->idev;
729 in6_dev_hold(idev);
730 pmc->mca_addr = im->mca_addr;
731 pmc->mca_crcount = idev->mc_qrv;
732 pmc->mca_sfmode = im->mca_sfmode;
733 if (pmc->mca_sfmode == MCAST_INCLUDE) {
734 struct ip6_sf_list *psf;
735
736 pmc->mca_tomb = im->mca_tomb;
737 pmc->mca_sources = im->mca_sources;
738 im->mca_tomb = im->mca_sources = NULL;
739 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
740 psf->sf_crcount = pmc->mca_crcount;
741 }
742 spin_unlock_bh(&im->mca_lock);
743
744 spin_lock_bh(&idev->mc_lock);
745 pmc->next = idev->mc_tomb;
746 idev->mc_tomb = pmc;
747 spin_unlock_bh(&idev->mc_lock);
748 }
749
750 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
751 {
752 struct ifmcaddr6 *pmc, *pmc_prev;
753 struct ip6_sf_list *psf, *psf_next;
754
755 spin_lock_bh(&idev->mc_lock);
756 pmc_prev = NULL;
757 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
758 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
759 break;
760 pmc_prev = pmc;
761 }
762 if (pmc) {
763 if (pmc_prev)
764 pmc_prev->next = pmc->next;
765 else
766 idev->mc_tomb = pmc->next;
767 }
768 spin_unlock_bh(&idev->mc_lock);
769
770 if (pmc) {
771 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
772 psf_next = psf->sf_next;
773 kfree(psf);
774 }
775 in6_dev_put(pmc->idev);
776 kfree(pmc);
777 }
778 }
779
780 static void mld_clear_delrec(struct inet6_dev *idev)
781 {
782 struct ifmcaddr6 *pmc, *nextpmc;
783
784 spin_lock_bh(&idev->mc_lock);
785 pmc = idev->mc_tomb;
786 idev->mc_tomb = NULL;
787 spin_unlock_bh(&idev->mc_lock);
788
789 for (; pmc; pmc = nextpmc) {
790 nextpmc = pmc->next;
791 ip6_mc_clear_src(pmc);
792 in6_dev_put(pmc->idev);
793 kfree(pmc);
794 }
795
796 /* clear dead sources, too */
797 read_lock_bh(&idev->lock);
798 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
799 struct ip6_sf_list *psf, *psf_next;
800
801 spin_lock_bh(&pmc->mca_lock);
802 psf = pmc->mca_tomb;
803 pmc->mca_tomb = NULL;
804 spin_unlock_bh(&pmc->mca_lock);
805 for (; psf; psf=psf_next) {
806 psf_next = psf->sf_next;
807 kfree(psf);
808 }
809 }
810 read_unlock_bh(&idev->lock);
811 }
812
813
814 /*
815 * device multicast group inc (add if not found)
816 */
817 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
818 {
819 struct ifmcaddr6 *mc;
820 struct inet6_dev *idev;
821
822 /* we need to take a reference on idev */
823 idev = in6_dev_get(dev);
824
825 if (idev == NULL)
826 return -EINVAL;
827
828 write_lock_bh(&idev->lock);
829 if (idev->dead) {
830 write_unlock_bh(&idev->lock);
831 in6_dev_put(idev);
832 return -ENODEV;
833 }
834
835 for (mc = idev->mc_list; mc; mc = mc->next) {
836 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
837 mc->mca_users++;
838 write_unlock_bh(&idev->lock);
839 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
840 NULL, 0);
841 in6_dev_put(idev);
842 return 0;
843 }
844 }
845
846 /*
847 * not found: create a new one.
848 */
849
850 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
851
852 if (mc == NULL) {
853 write_unlock_bh(&idev->lock);
854 in6_dev_put(idev);
855 return -ENOMEM;
856 }
857
858 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
859
860 mc->mca_addr = *addr;
861 mc->idev = idev; /* (reference taken) */
862 mc->mca_users = 1;
863 /* mca_stamp should be updated upon changes */
864 mc->mca_cstamp = mc->mca_tstamp = jiffies;
865 atomic_set(&mc->mca_refcnt, 2);
866 spin_lock_init(&mc->mca_lock);
867
868 /* initial mode is (EX, empty) */
869 mc->mca_sfmode = MCAST_EXCLUDE;
870 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
871
872 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
873 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
874 mc->mca_flags |= MAF_NOREPORT;
875
876 mc->next = idev->mc_list;
877 idev->mc_list = mc;
878 write_unlock_bh(&idev->lock);
879
880 mld_del_delrec(idev, &mc->mca_addr);
881 igmp6_group_added(mc);
882 ma_put(mc);
883 return 0;
884 }
885
886 /*
887 * device multicast group del
888 */
889 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
890 {
891 struct ifmcaddr6 *ma, **map;
892
893 write_lock_bh(&idev->lock);
894 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
895 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
896 if (--ma->mca_users == 0) {
897 *map = ma->next;
898 write_unlock_bh(&idev->lock);
899
900 igmp6_group_dropped(ma);
901
902 ma_put(ma);
903 return 0;
904 }
905 write_unlock_bh(&idev->lock);
906 return 0;
907 }
908 }
909 write_unlock_bh(&idev->lock);
910
911 return -ENOENT;
912 }
913
914 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
915 {
916 struct inet6_dev *idev;
917 int err;
918
919 rcu_read_lock();
920
921 idev = __in6_dev_get(dev);
922 if (!idev)
923 err = -ENODEV;
924 else
925 err = __ipv6_dev_mc_dec(idev, addr);
926
927 rcu_read_unlock();
928 return err;
929 }
930
931 /*
932 * identify MLD packets for MLD filter exceptions
933 */
934 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
935 {
936 struct icmp6hdr *pic;
937
938 if (nexthdr != IPPROTO_ICMPV6)
939 return 0;
940
941 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
942 return 0;
943
944 pic = icmp6_hdr(skb);
945
946 switch (pic->icmp6_type) {
947 case ICMPV6_MGM_QUERY:
948 case ICMPV6_MGM_REPORT:
949 case ICMPV6_MGM_REDUCTION:
950 case ICMPV6_MLD2_REPORT:
951 return 1;
952 default:
953 break;
954 }
955 return 0;
956 }
957
958 /*
959 * check if the interface/address pair is valid
960 */
961 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
962 const struct in6_addr *src_addr)
963 {
964 struct inet6_dev *idev;
965 struct ifmcaddr6 *mc;
966 int rv = 0;
967
968 rcu_read_lock();
969 idev = __in6_dev_get(dev);
970 if (idev) {
971 read_lock_bh(&idev->lock);
972 for (mc = idev->mc_list; mc; mc=mc->next) {
973 if (ipv6_addr_equal(&mc->mca_addr, group))
974 break;
975 }
976 if (mc) {
977 if (src_addr && !ipv6_addr_any(src_addr)) {
978 struct ip6_sf_list *psf;
979
980 spin_lock_bh(&mc->mca_lock);
981 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
982 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
983 break;
984 }
985 if (psf)
986 rv = psf->sf_count[MCAST_INCLUDE] ||
987 psf->sf_count[MCAST_EXCLUDE] !=
988 mc->mca_sfcount[MCAST_EXCLUDE];
989 else
990 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
991 spin_unlock_bh(&mc->mca_lock);
992 } else
993 rv = 1; /* don't filter unspecified source */
994 }
995 read_unlock_bh(&idev->lock);
996 }
997 rcu_read_unlock();
998 return rv;
999 }
1000
1001 static void mld_gq_start_timer(struct inet6_dev *idev)
1002 {
1003 int tv = net_random() % idev->mc_maxdelay;
1004
1005 idev->mc_gq_running = 1;
1006 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1007 in6_dev_hold(idev);
1008 }
1009
1010 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1011 {
1012 int tv = net_random() % delay;
1013
1014 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1015 in6_dev_hold(idev);
1016 }
1017
1018 /*
1019 * IGMP handling (alias multicast ICMPv6 messages)
1020 */
1021
1022 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1023 {
1024 unsigned long delay = resptime;
1025
1026 /* Do not start timer for these addresses */
1027 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1028 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1029 return;
1030
1031 if (del_timer(&ma->mca_timer)) {
1032 atomic_dec(&ma->mca_refcnt);
1033 delay = ma->mca_timer.expires - jiffies;
1034 }
1035
1036 if (delay >= resptime) {
1037 if (resptime)
1038 delay = net_random() % resptime;
1039 else
1040 delay = 1;
1041 }
1042 ma->mca_timer.expires = jiffies + delay;
1043 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1044 atomic_inc(&ma->mca_refcnt);
1045 ma->mca_flags |= MAF_TIMER_RUNNING;
1046 }
1047
1048 /* mark EXCLUDE-mode sources */
1049 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1050 const struct in6_addr *srcs)
1051 {
1052 struct ip6_sf_list *psf;
1053 int i, scount;
1054
1055 scount = 0;
1056 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1057 if (scount == nsrcs)
1058 break;
1059 for (i=0; i<nsrcs; i++) {
1060 /* skip inactive filters */
1061 if (psf->sf_count[MCAST_INCLUDE] ||
1062 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1063 psf->sf_count[MCAST_EXCLUDE])
1064 continue;
1065 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1066 scount++;
1067 break;
1068 }
1069 }
1070 }
1071 pmc->mca_flags &= ~MAF_GSQUERY;
1072 if (scount == nsrcs) /* all sources excluded */
1073 return 0;
1074 return 1;
1075 }
1076
1077 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1078 const struct in6_addr *srcs)
1079 {
1080 struct ip6_sf_list *psf;
1081 int i, scount;
1082
1083 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1084 return mld_xmarksources(pmc, nsrcs, srcs);
1085
1086 /* mark INCLUDE-mode sources */
1087
1088 scount = 0;
1089 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1090 if (scount == nsrcs)
1091 break;
1092 for (i=0; i<nsrcs; i++) {
1093 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1094 psf->sf_gsresp = 1;
1095 scount++;
1096 break;
1097 }
1098 }
1099 }
1100 if (!scount) {
1101 pmc->mca_flags &= ~MAF_GSQUERY;
1102 return 0;
1103 }
1104 pmc->mca_flags |= MAF_GSQUERY;
1105 return 1;
1106 }
1107
1108 /* called with rcu_read_lock() */
1109 int igmp6_event_query(struct sk_buff *skb)
1110 {
1111 struct mld2_query *mlh2 = NULL;
1112 struct ifmcaddr6 *ma;
1113 const struct in6_addr *group;
1114 unsigned long max_delay;
1115 struct inet6_dev *idev;
1116 struct mld_msg *mld;
1117 int group_type;
1118 int mark = 0;
1119 int len;
1120
1121 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1122 return -EINVAL;
1123
1124 /* compute payload length excluding extension headers */
1125 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1126 len -= skb_network_header_len(skb);
1127
1128 /* Drop queries with not link local source */
1129 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1130 return -EINVAL;
1131
1132 idev = __in6_dev_get(skb->dev);
1133
1134 if (idev == NULL)
1135 return 0;
1136
1137 mld = (struct mld_msg *)icmp6_hdr(skb);
1138 group = &mld->mld_mca;
1139 group_type = ipv6_addr_type(group);
1140
1141 if (group_type != IPV6_ADDR_ANY &&
1142 !(group_type&IPV6_ADDR_MULTICAST))
1143 return -EINVAL;
1144
1145 if (len == 24) {
1146 int switchback;
1147 /* MLDv1 router present */
1148
1149 /* Translate milliseconds to jiffies */
1150 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1151
1152 switchback = (idev->mc_qrv + 1) * max_delay;
1153 idev->mc_v1_seen = jiffies + switchback;
1154
1155 /* cancel the interface change timer */
1156 idev->mc_ifc_count = 0;
1157 if (del_timer(&idev->mc_ifc_timer))
1158 __in6_dev_put(idev);
1159 /* clear deleted report items */
1160 mld_clear_delrec(idev);
1161 } else if (len >= 28) {
1162 int srcs_offset = sizeof(struct mld2_query) -
1163 sizeof(struct icmp6hdr);
1164 if (!pskb_may_pull(skb, srcs_offset))
1165 return -EINVAL;
1166
1167 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1168 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1169 if (!max_delay)
1170 max_delay = 1;
1171 idev->mc_maxdelay = max_delay;
1172 if (mlh2->mld2q_qrv)
1173 idev->mc_qrv = mlh2->mld2q_qrv;
1174 if (group_type == IPV6_ADDR_ANY) { /* general query */
1175 if (mlh2->mld2q_nsrcs)
1176 return -EINVAL; /* no sources allowed */
1177
1178 mld_gq_start_timer(idev);
1179 return 0;
1180 }
1181 /* mark sources to include, if group & source-specific */
1182 if (mlh2->mld2q_nsrcs != 0) {
1183 if (!pskb_may_pull(skb, srcs_offset +
1184 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1185 return -EINVAL;
1186
1187 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1188 mark = 1;
1189 }
1190 } else
1191 return -EINVAL;
1192
1193 read_lock_bh(&idev->lock);
1194 if (group_type == IPV6_ADDR_ANY) {
1195 for (ma = idev->mc_list; ma; ma=ma->next) {
1196 spin_lock_bh(&ma->mca_lock);
1197 igmp6_group_queried(ma, max_delay);
1198 spin_unlock_bh(&ma->mca_lock);
1199 }
1200 } else {
1201 for (ma = idev->mc_list; ma; ma=ma->next) {
1202 if (!ipv6_addr_equal(group, &ma->mca_addr))
1203 continue;
1204 spin_lock_bh(&ma->mca_lock);
1205 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1206 /* gsquery <- gsquery && mark */
1207 if (!mark)
1208 ma->mca_flags &= ~MAF_GSQUERY;
1209 } else {
1210 /* gsquery <- mark */
1211 if (mark)
1212 ma->mca_flags |= MAF_GSQUERY;
1213 else
1214 ma->mca_flags &= ~MAF_GSQUERY;
1215 }
1216 if (!(ma->mca_flags & MAF_GSQUERY) ||
1217 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1218 igmp6_group_queried(ma, max_delay);
1219 spin_unlock_bh(&ma->mca_lock);
1220 break;
1221 }
1222 }
1223 read_unlock_bh(&idev->lock);
1224
1225 return 0;
1226 }
1227
1228 /* called with rcu_read_lock() */
1229 int igmp6_event_report(struct sk_buff *skb)
1230 {
1231 struct ifmcaddr6 *ma;
1232 struct inet6_dev *idev;
1233 struct mld_msg *mld;
1234 int addr_type;
1235
1236 /* Our own report looped back. Ignore it. */
1237 if (skb->pkt_type == PACKET_LOOPBACK)
1238 return 0;
1239
1240 /* send our report if the MC router may not have heard this report */
1241 if (skb->pkt_type != PACKET_MULTICAST &&
1242 skb->pkt_type != PACKET_BROADCAST)
1243 return 0;
1244
1245 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1246 return -EINVAL;
1247
1248 mld = (struct mld_msg *)icmp6_hdr(skb);
1249
1250 /* Drop reports with not link local source */
1251 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1252 if (addr_type != IPV6_ADDR_ANY &&
1253 !(addr_type&IPV6_ADDR_LINKLOCAL))
1254 return -EINVAL;
1255
1256 idev = __in6_dev_get(skb->dev);
1257 if (idev == NULL)
1258 return -ENODEV;
1259
1260 /*
1261 * Cancel the timer for this group
1262 */
1263
1264 read_lock_bh(&idev->lock);
1265 for (ma = idev->mc_list; ma; ma=ma->next) {
1266 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1267 spin_lock(&ma->mca_lock);
1268 if (del_timer(&ma->mca_timer))
1269 atomic_dec(&ma->mca_refcnt);
1270 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1271 spin_unlock(&ma->mca_lock);
1272 break;
1273 }
1274 }
1275 read_unlock_bh(&idev->lock);
1276 return 0;
1277 }
1278
1279 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1280 int gdeleted, int sdeleted)
1281 {
1282 switch (type) {
1283 case MLD2_MODE_IS_INCLUDE:
1284 case MLD2_MODE_IS_EXCLUDE:
1285 if (gdeleted || sdeleted)
1286 return 0;
1287 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1288 if (pmc->mca_sfmode == MCAST_INCLUDE)
1289 return 1;
1290 /* don't include if this source is excluded
1291 * in all filters
1292 */
1293 if (psf->sf_count[MCAST_INCLUDE])
1294 return type == MLD2_MODE_IS_INCLUDE;
1295 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1296 psf->sf_count[MCAST_EXCLUDE];
1297 }
1298 return 0;
1299 case MLD2_CHANGE_TO_INCLUDE:
1300 if (gdeleted || sdeleted)
1301 return 0;
1302 return psf->sf_count[MCAST_INCLUDE] != 0;
1303 case MLD2_CHANGE_TO_EXCLUDE:
1304 if (gdeleted || sdeleted)
1305 return 0;
1306 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1307 psf->sf_count[MCAST_INCLUDE])
1308 return 0;
1309 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1310 psf->sf_count[MCAST_EXCLUDE];
1311 case MLD2_ALLOW_NEW_SOURCES:
1312 if (gdeleted || !psf->sf_crcount)
1313 return 0;
1314 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1315 case MLD2_BLOCK_OLD_SOURCES:
1316 if (pmc->mca_sfmode == MCAST_INCLUDE)
1317 return gdeleted || (psf->sf_crcount && sdeleted);
1318 return psf->sf_crcount && !gdeleted && !sdeleted;
1319 }
1320 return 0;
1321 }
1322
1323 static int
1324 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1325 {
1326 struct ip6_sf_list *psf;
1327 int scount = 0;
1328
1329 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1330 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1331 continue;
1332 scount++;
1333 }
1334 return scount;
1335 }
1336
1337 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1338 {
1339 struct net *net = dev_net(dev);
1340 struct sock *sk = net->ipv6.igmp_sk;
1341 struct sk_buff *skb;
1342 struct mld2_report *pmr;
1343 struct in6_addr addr_buf;
1344 const struct in6_addr *saddr;
1345 int hlen = LL_RESERVED_SPACE(dev);
1346 int tlen = dev->needed_tailroom;
1347 int err;
1348 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1349 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1350 IPV6_TLV_PADN, 0 };
1351
1352 /* we assume size > sizeof(ra) here */
1353 size += hlen + tlen;
1354 /* limit our allocations to order-0 page */
1355 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1356 skb = sock_alloc_send_skb(sk, size, 1, &err);
1357
1358 if (!skb)
1359 return NULL;
1360
1361 skb_reserve(skb, hlen);
1362
1363 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1364 /* <draft-ietf-magma-mld-source-05.txt>:
1365 * use unspecified address as the source address
1366 * when a valid link-local address is not available.
1367 */
1368 saddr = &in6addr_any;
1369 } else
1370 saddr = &addr_buf;
1371
1372 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1373
1374 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1375
1376 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1377 skb_put(skb, sizeof(*pmr));
1378 pmr = (struct mld2_report *)skb_transport_header(skb);
1379 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1380 pmr->mld2r_resv1 = 0;
1381 pmr->mld2r_cksum = 0;
1382 pmr->mld2r_resv2 = 0;
1383 pmr->mld2r_ngrec = 0;
1384 return skb;
1385 }
1386
1387 static void mld_sendpack(struct sk_buff *skb)
1388 {
1389 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1390 struct mld2_report *pmr =
1391 (struct mld2_report *)skb_transport_header(skb);
1392 int payload_len, mldlen;
1393 struct inet6_dev *idev;
1394 struct net *net = dev_net(skb->dev);
1395 int err;
1396 struct flowi6 fl6;
1397 struct dst_entry *dst;
1398
1399 rcu_read_lock();
1400 idev = __in6_dev_get(skb->dev);
1401 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1402
1403 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1404 mldlen = skb->tail - skb->transport_header;
1405 pip6->payload_len = htons(payload_len);
1406
1407 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1408 IPPROTO_ICMPV6,
1409 csum_partial(skb_transport_header(skb),
1410 mldlen, 0));
1411
1412 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1413 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1414 skb->dev->ifindex);
1415 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1416
1417 err = 0;
1418 if (IS_ERR(dst)) {
1419 err = PTR_ERR(dst);
1420 dst = NULL;
1421 }
1422 skb_dst_set(skb, dst);
1423 if (err)
1424 goto err_out;
1425
1426 payload_len = skb->len;
1427
1428 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1429 dst_output);
1430 out:
1431 if (!err) {
1432 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1433 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1434 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1435 } else
1436 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1437
1438 rcu_read_unlock();
1439 return;
1440
1441 err_out:
1442 kfree_skb(skb);
1443 goto out;
1444 }
1445
1446 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1447 {
1448 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1449 }
1450
1451 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1452 int type, struct mld2_grec **ppgr)
1453 {
1454 struct net_device *dev = pmc->idev->dev;
1455 struct mld2_report *pmr;
1456 struct mld2_grec *pgr;
1457
1458 if (!skb)
1459 skb = mld_newpack(dev, dev->mtu);
1460 if (!skb)
1461 return NULL;
1462 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1463 pgr->grec_type = type;
1464 pgr->grec_auxwords = 0;
1465 pgr->grec_nsrcs = 0;
1466 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1467 pmr = (struct mld2_report *)skb_transport_header(skb);
1468 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1469 *ppgr = pgr;
1470 return skb;
1471 }
1472
1473 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1474 skb_tailroom(skb)) : 0)
1475
1476 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1477 int type, int gdeleted, int sdeleted)
1478 {
1479 struct net_device *dev = pmc->idev->dev;
1480 struct mld2_report *pmr;
1481 struct mld2_grec *pgr = NULL;
1482 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1483 int scount, stotal, first, isquery, truncate;
1484
1485 if (pmc->mca_flags & MAF_NOREPORT)
1486 return skb;
1487
1488 isquery = type == MLD2_MODE_IS_INCLUDE ||
1489 type == MLD2_MODE_IS_EXCLUDE;
1490 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1491 type == MLD2_CHANGE_TO_EXCLUDE;
1492
1493 stotal = scount = 0;
1494
1495 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1496
1497 if (!*psf_list)
1498 goto empty_source;
1499
1500 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1501
1502 /* EX and TO_EX get a fresh packet, if needed */
1503 if (truncate) {
1504 if (pmr && pmr->mld2r_ngrec &&
1505 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1506 if (skb)
1507 mld_sendpack(skb);
1508 skb = mld_newpack(dev, dev->mtu);
1509 }
1510 }
1511 first = 1;
1512 psf_prev = NULL;
1513 for (psf=*psf_list; psf; psf=psf_next) {
1514 struct in6_addr *psrc;
1515
1516 psf_next = psf->sf_next;
1517
1518 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1519 psf_prev = psf;
1520 continue;
1521 }
1522
1523 /* clear marks on query responses */
1524 if (isquery)
1525 psf->sf_gsresp = 0;
1526
1527 if (AVAILABLE(skb) < sizeof(*psrc) +
1528 first*sizeof(struct mld2_grec)) {
1529 if (truncate && !first)
1530 break; /* truncate these */
1531 if (pgr)
1532 pgr->grec_nsrcs = htons(scount);
1533 if (skb)
1534 mld_sendpack(skb);
1535 skb = mld_newpack(dev, dev->mtu);
1536 first = 1;
1537 scount = 0;
1538 }
1539 if (first) {
1540 skb = add_grhead(skb, pmc, type, &pgr);
1541 first = 0;
1542 }
1543 if (!skb)
1544 return NULL;
1545 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1546 *psrc = psf->sf_addr;
1547 scount++; stotal++;
1548 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1549 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1550 psf->sf_crcount--;
1551 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1552 if (psf_prev)
1553 psf_prev->sf_next = psf->sf_next;
1554 else
1555 *psf_list = psf->sf_next;
1556 kfree(psf);
1557 continue;
1558 }
1559 }
1560 psf_prev = psf;
1561 }
1562
1563 empty_source:
1564 if (!stotal) {
1565 if (type == MLD2_ALLOW_NEW_SOURCES ||
1566 type == MLD2_BLOCK_OLD_SOURCES)
1567 return skb;
1568 if (pmc->mca_crcount || isquery) {
1569 /* make sure we have room for group header */
1570 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1571 mld_sendpack(skb);
1572 skb = NULL; /* add_grhead will get a new one */
1573 }
1574 skb = add_grhead(skb, pmc, type, &pgr);
1575 }
1576 }
1577 if (pgr)
1578 pgr->grec_nsrcs = htons(scount);
1579
1580 if (isquery)
1581 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1582 return skb;
1583 }
1584
1585 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1586 {
1587 struct sk_buff *skb = NULL;
1588 int type;
1589
1590 if (!pmc) {
1591 read_lock_bh(&idev->lock);
1592 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1593 if (pmc->mca_flags & MAF_NOREPORT)
1594 continue;
1595 spin_lock_bh(&pmc->mca_lock);
1596 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1597 type = MLD2_MODE_IS_EXCLUDE;
1598 else
1599 type = MLD2_MODE_IS_INCLUDE;
1600 skb = add_grec(skb, pmc, type, 0, 0);
1601 spin_unlock_bh(&pmc->mca_lock);
1602 }
1603 read_unlock_bh(&idev->lock);
1604 } else {
1605 spin_lock_bh(&pmc->mca_lock);
1606 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1607 type = MLD2_MODE_IS_EXCLUDE;
1608 else
1609 type = MLD2_MODE_IS_INCLUDE;
1610 skb = add_grec(skb, pmc, type, 0, 0);
1611 spin_unlock_bh(&pmc->mca_lock);
1612 }
1613 if (skb)
1614 mld_sendpack(skb);
1615 }
1616
1617 /*
1618 * remove zero-count source records from a source filter list
1619 */
1620 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1621 {
1622 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1623
1624 psf_prev = NULL;
1625 for (psf=*ppsf; psf; psf = psf_next) {
1626 psf_next = psf->sf_next;
1627 if (psf->sf_crcount == 0) {
1628 if (psf_prev)
1629 psf_prev->sf_next = psf->sf_next;
1630 else
1631 *ppsf = psf->sf_next;
1632 kfree(psf);
1633 } else
1634 psf_prev = psf;
1635 }
1636 }
1637
1638 static void mld_send_cr(struct inet6_dev *idev)
1639 {
1640 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1641 struct sk_buff *skb = NULL;
1642 int type, dtype;
1643
1644 read_lock_bh(&idev->lock);
1645 spin_lock(&idev->mc_lock);
1646
1647 /* deleted MCA's */
1648 pmc_prev = NULL;
1649 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1650 pmc_next = pmc->next;
1651 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1652 type = MLD2_BLOCK_OLD_SOURCES;
1653 dtype = MLD2_BLOCK_OLD_SOURCES;
1654 skb = add_grec(skb, pmc, type, 1, 0);
1655 skb = add_grec(skb, pmc, dtype, 1, 1);
1656 }
1657 if (pmc->mca_crcount) {
1658 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1659 type = MLD2_CHANGE_TO_INCLUDE;
1660 skb = add_grec(skb, pmc, type, 1, 0);
1661 }
1662 pmc->mca_crcount--;
1663 if (pmc->mca_crcount == 0) {
1664 mld_clear_zeros(&pmc->mca_tomb);
1665 mld_clear_zeros(&pmc->mca_sources);
1666 }
1667 }
1668 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1669 !pmc->mca_sources) {
1670 if (pmc_prev)
1671 pmc_prev->next = pmc_next;
1672 else
1673 idev->mc_tomb = pmc_next;
1674 in6_dev_put(pmc->idev);
1675 kfree(pmc);
1676 } else
1677 pmc_prev = pmc;
1678 }
1679 spin_unlock(&idev->mc_lock);
1680
1681 /* change recs */
1682 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1683 spin_lock_bh(&pmc->mca_lock);
1684 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1685 type = MLD2_BLOCK_OLD_SOURCES;
1686 dtype = MLD2_ALLOW_NEW_SOURCES;
1687 } else {
1688 type = MLD2_ALLOW_NEW_SOURCES;
1689 dtype = MLD2_BLOCK_OLD_SOURCES;
1690 }
1691 skb = add_grec(skb, pmc, type, 0, 0);
1692 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1693
1694 /* filter mode changes */
1695 if (pmc->mca_crcount) {
1696 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1697 type = MLD2_CHANGE_TO_EXCLUDE;
1698 else
1699 type = MLD2_CHANGE_TO_INCLUDE;
1700 skb = add_grec(skb, pmc, type, 0, 0);
1701 pmc->mca_crcount--;
1702 }
1703 spin_unlock_bh(&pmc->mca_lock);
1704 }
1705 read_unlock_bh(&idev->lock);
1706 if (!skb)
1707 return;
1708 (void) mld_sendpack(skb);
1709 }
1710
1711 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1712 {
1713 struct net *net = dev_net(dev);
1714 struct sock *sk = net->ipv6.igmp_sk;
1715 struct inet6_dev *idev;
1716 struct sk_buff *skb;
1717 struct mld_msg *hdr;
1718 const struct in6_addr *snd_addr, *saddr;
1719 struct in6_addr addr_buf;
1720 int hlen = LL_RESERVED_SPACE(dev);
1721 int tlen = dev->needed_tailroom;
1722 int err, len, payload_len, full_len;
1723 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1724 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1725 IPV6_TLV_PADN, 0 };
1726 struct flowi6 fl6;
1727 struct dst_entry *dst;
1728
1729 if (type == ICMPV6_MGM_REDUCTION)
1730 snd_addr = &in6addr_linklocal_allrouters;
1731 else
1732 snd_addr = addr;
1733
1734 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1735 payload_len = len + sizeof(ra);
1736 full_len = sizeof(struct ipv6hdr) + payload_len;
1737
1738 rcu_read_lock();
1739 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1740 IPSTATS_MIB_OUT, full_len);
1741 rcu_read_unlock();
1742
1743 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1744
1745 if (skb == NULL) {
1746 rcu_read_lock();
1747 IP6_INC_STATS(net, __in6_dev_get(dev),
1748 IPSTATS_MIB_OUTDISCARDS);
1749 rcu_read_unlock();
1750 return;
1751 }
1752
1753 skb_reserve(skb, hlen);
1754
1755 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1756 /* <draft-ietf-magma-mld-source-05.txt>:
1757 * use unspecified address as the source address
1758 * when a valid link-local address is not available.
1759 */
1760 saddr = &in6addr_any;
1761 } else
1762 saddr = &addr_buf;
1763
1764 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1765
1766 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1767
1768 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1769 memset(hdr, 0, sizeof(struct mld_msg));
1770 hdr->mld_type = type;
1771 hdr->mld_mca = *addr;
1772
1773 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1774 IPPROTO_ICMPV6,
1775 csum_partial(hdr, len, 0));
1776
1777 rcu_read_lock();
1778 idev = __in6_dev_get(skb->dev);
1779
1780 icmpv6_flow_init(sk, &fl6, type,
1781 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1782 skb->dev->ifindex);
1783 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1784 if (IS_ERR(dst)) {
1785 err = PTR_ERR(dst);
1786 goto err_out;
1787 }
1788
1789 skb_dst_set(skb, dst);
1790 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1791 dst_output);
1792 out:
1793 if (!err) {
1794 ICMP6MSGOUT_INC_STATS(net, idev, type);
1795 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1796 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1797 } else
1798 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1799
1800 rcu_read_unlock();
1801 return;
1802
1803 err_out:
1804 kfree_skb(skb);
1805 goto out;
1806 }
1807
1808 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1809 const struct in6_addr *psfsrc)
1810 {
1811 struct ip6_sf_list *psf, *psf_prev;
1812 int rv = 0;
1813
1814 psf_prev = NULL;
1815 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1816 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1817 break;
1818 psf_prev = psf;
1819 }
1820 if (!psf || psf->sf_count[sfmode] == 0) {
1821 /* source filter not found, or count wrong => bug */
1822 return -ESRCH;
1823 }
1824 psf->sf_count[sfmode]--;
1825 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1826 struct inet6_dev *idev = pmc->idev;
1827
1828 /* no more filters for this source */
1829 if (psf_prev)
1830 psf_prev->sf_next = psf->sf_next;
1831 else
1832 pmc->mca_sources = psf->sf_next;
1833 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1834 !MLD_V1_SEEN(idev)) {
1835 psf->sf_crcount = idev->mc_qrv;
1836 psf->sf_next = pmc->mca_tomb;
1837 pmc->mca_tomb = psf;
1838 rv = 1;
1839 } else
1840 kfree(psf);
1841 }
1842 return rv;
1843 }
1844
1845 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1846 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1847 int delta)
1848 {
1849 struct ifmcaddr6 *pmc;
1850 int changerec = 0;
1851 int i, err;
1852
1853 if (!idev)
1854 return -ENODEV;
1855 read_lock_bh(&idev->lock);
1856 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1857 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1858 break;
1859 }
1860 if (!pmc) {
1861 /* MCA not found?? bug */
1862 read_unlock_bh(&idev->lock);
1863 return -ESRCH;
1864 }
1865 spin_lock_bh(&pmc->mca_lock);
1866 sf_markstate(pmc);
1867 if (!delta) {
1868 if (!pmc->mca_sfcount[sfmode]) {
1869 spin_unlock_bh(&pmc->mca_lock);
1870 read_unlock_bh(&idev->lock);
1871 return -EINVAL;
1872 }
1873 pmc->mca_sfcount[sfmode]--;
1874 }
1875 err = 0;
1876 for (i=0; i<sfcount; i++) {
1877 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1878
1879 changerec |= rv > 0;
1880 if (!err && rv < 0)
1881 err = rv;
1882 }
1883 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1884 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1885 pmc->mca_sfcount[MCAST_INCLUDE]) {
1886 struct ip6_sf_list *psf;
1887
1888 /* filter mode change */
1889 pmc->mca_sfmode = MCAST_INCLUDE;
1890 pmc->mca_crcount = idev->mc_qrv;
1891 idev->mc_ifc_count = pmc->mca_crcount;
1892 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1893 psf->sf_crcount = 0;
1894 mld_ifc_event(pmc->idev);
1895 } else if (sf_setstate(pmc) || changerec)
1896 mld_ifc_event(pmc->idev);
1897 spin_unlock_bh(&pmc->mca_lock);
1898 read_unlock_bh(&idev->lock);
1899 return err;
1900 }
1901
1902 /*
1903 * Add multicast single-source filter to the interface list
1904 */
1905 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1906 const struct in6_addr *psfsrc)
1907 {
1908 struct ip6_sf_list *psf, *psf_prev;
1909
1910 psf_prev = NULL;
1911 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1912 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1913 break;
1914 psf_prev = psf;
1915 }
1916 if (!psf) {
1917 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1918 if (!psf)
1919 return -ENOBUFS;
1920
1921 psf->sf_addr = *psfsrc;
1922 if (psf_prev) {
1923 psf_prev->sf_next = psf;
1924 } else
1925 pmc->mca_sources = psf;
1926 }
1927 psf->sf_count[sfmode]++;
1928 return 0;
1929 }
1930
1931 static void sf_markstate(struct ifmcaddr6 *pmc)
1932 {
1933 struct ip6_sf_list *psf;
1934 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1935
1936 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1937 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1938 psf->sf_oldin = mca_xcount ==
1939 psf->sf_count[MCAST_EXCLUDE] &&
1940 !psf->sf_count[MCAST_INCLUDE];
1941 } else
1942 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1943 }
1944
1945 static int sf_setstate(struct ifmcaddr6 *pmc)
1946 {
1947 struct ip6_sf_list *psf, *dpsf;
1948 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1949 int qrv = pmc->idev->mc_qrv;
1950 int new_in, rv;
1951
1952 rv = 0;
1953 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1954 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1955 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1956 !psf->sf_count[MCAST_INCLUDE];
1957 } else
1958 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1959 if (new_in) {
1960 if (!psf->sf_oldin) {
1961 struct ip6_sf_list *prev = NULL;
1962
1963 for (dpsf=pmc->mca_tomb; dpsf;
1964 dpsf=dpsf->sf_next) {
1965 if (ipv6_addr_equal(&dpsf->sf_addr,
1966 &psf->sf_addr))
1967 break;
1968 prev = dpsf;
1969 }
1970 if (dpsf) {
1971 if (prev)
1972 prev->sf_next = dpsf->sf_next;
1973 else
1974 pmc->mca_tomb = dpsf->sf_next;
1975 kfree(dpsf);
1976 }
1977 psf->sf_crcount = qrv;
1978 rv++;
1979 }
1980 } else if (psf->sf_oldin) {
1981 psf->sf_crcount = 0;
1982 /*
1983 * add or update "delete" records if an active filter
1984 * is now inactive
1985 */
1986 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1987 if (ipv6_addr_equal(&dpsf->sf_addr,
1988 &psf->sf_addr))
1989 break;
1990 if (!dpsf) {
1991 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1992 if (!dpsf)
1993 continue;
1994 *dpsf = *psf;
1995 /* pmc->mca_lock held by callers */
1996 dpsf->sf_next = pmc->mca_tomb;
1997 pmc->mca_tomb = dpsf;
1998 }
1999 dpsf->sf_crcount = qrv;
2000 rv++;
2001 }
2002 }
2003 return rv;
2004 }
2005
2006 /*
2007 * Add multicast source filter list to the interface list
2008 */
2009 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2010 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2011 int delta)
2012 {
2013 struct ifmcaddr6 *pmc;
2014 int isexclude;
2015 int i, err;
2016
2017 if (!idev)
2018 return -ENODEV;
2019 read_lock_bh(&idev->lock);
2020 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2021 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2022 break;
2023 }
2024 if (!pmc) {
2025 /* MCA not found?? bug */
2026 read_unlock_bh(&idev->lock);
2027 return -ESRCH;
2028 }
2029 spin_lock_bh(&pmc->mca_lock);
2030
2031 sf_markstate(pmc);
2032 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2033 if (!delta)
2034 pmc->mca_sfcount[sfmode]++;
2035 err = 0;
2036 for (i=0; i<sfcount; i++) {
2037 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2038 if (err)
2039 break;
2040 }
2041 if (err) {
2042 int j;
2043
2044 if (!delta)
2045 pmc->mca_sfcount[sfmode]--;
2046 for (j=0; j<i; j++)
2047 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2048 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2049 struct ip6_sf_list *psf;
2050
2051 /* filter mode change */
2052 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2053 pmc->mca_sfmode = MCAST_EXCLUDE;
2054 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2055 pmc->mca_sfmode = MCAST_INCLUDE;
2056 /* else no filters; keep old mode for reports */
2057
2058 pmc->mca_crcount = idev->mc_qrv;
2059 idev->mc_ifc_count = pmc->mca_crcount;
2060 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2061 psf->sf_crcount = 0;
2062 mld_ifc_event(idev);
2063 } else if (sf_setstate(pmc))
2064 mld_ifc_event(idev);
2065 spin_unlock_bh(&pmc->mca_lock);
2066 read_unlock_bh(&idev->lock);
2067 return err;
2068 }
2069
2070 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2071 {
2072 struct ip6_sf_list *psf, *nextpsf;
2073
2074 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2075 nextpsf = psf->sf_next;
2076 kfree(psf);
2077 }
2078 pmc->mca_tomb = NULL;
2079 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2080 nextpsf = psf->sf_next;
2081 kfree(psf);
2082 }
2083 pmc->mca_sources = NULL;
2084 pmc->mca_sfmode = MCAST_EXCLUDE;
2085 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2086 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2087 }
2088
2089
2090 static void igmp6_join_group(struct ifmcaddr6 *ma)
2091 {
2092 unsigned long delay;
2093
2094 if (ma->mca_flags & MAF_NOREPORT)
2095 return;
2096
2097 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2098
2099 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2100
2101 spin_lock_bh(&ma->mca_lock);
2102 if (del_timer(&ma->mca_timer)) {
2103 atomic_dec(&ma->mca_refcnt);
2104 delay = ma->mca_timer.expires - jiffies;
2105 }
2106
2107 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2108 atomic_inc(&ma->mca_refcnt);
2109 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2110 spin_unlock_bh(&ma->mca_lock);
2111 }
2112
2113 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2114 struct inet6_dev *idev)
2115 {
2116 int err;
2117
2118 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2119 * so no other readers or writers of iml or its sflist
2120 */
2121 if (!iml->sflist) {
2122 /* any-source empty exclude case */
2123 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2124 }
2125 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2126 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2127 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2128 iml->sflist = NULL;
2129 return err;
2130 }
2131
2132 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2133 {
2134 if (MLD_V1_SEEN(ma->idev)) {
2135 if (ma->mca_flags & MAF_LAST_REPORTER)
2136 igmp6_send(&ma->mca_addr, ma->idev->dev,
2137 ICMPV6_MGM_REDUCTION);
2138 } else {
2139 mld_add_delrec(ma->idev, ma);
2140 mld_ifc_event(ma->idev);
2141 }
2142 }
2143
2144 static void mld_gq_timer_expire(unsigned long data)
2145 {
2146 struct inet6_dev *idev = (struct inet6_dev *)data;
2147
2148 idev->mc_gq_running = 0;
2149 mld_send_report(idev, NULL);
2150 __in6_dev_put(idev);
2151 }
2152
2153 static void mld_ifc_timer_expire(unsigned long data)
2154 {
2155 struct inet6_dev *idev = (struct inet6_dev *)data;
2156
2157 mld_send_cr(idev);
2158 if (idev->mc_ifc_count) {
2159 idev->mc_ifc_count--;
2160 if (idev->mc_ifc_count)
2161 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2162 }
2163 __in6_dev_put(idev);
2164 }
2165
2166 static void mld_ifc_event(struct inet6_dev *idev)
2167 {
2168 if (MLD_V1_SEEN(idev))
2169 return;
2170 idev->mc_ifc_count = idev->mc_qrv;
2171 mld_ifc_start_timer(idev, 1);
2172 }
2173
2174
2175 static void igmp6_timer_handler(unsigned long data)
2176 {
2177 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2178
2179 if (MLD_V1_SEEN(ma->idev))
2180 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2181 else
2182 mld_send_report(ma->idev, ma);
2183
2184 spin_lock(&ma->mca_lock);
2185 ma->mca_flags |= MAF_LAST_REPORTER;
2186 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2187 spin_unlock(&ma->mca_lock);
2188 ma_put(ma);
2189 }
2190
2191 /* Device changing type */
2192
2193 void ipv6_mc_unmap(struct inet6_dev *idev)
2194 {
2195 struct ifmcaddr6 *i;
2196
2197 /* Install multicast list, except for all-nodes (already installed) */
2198
2199 read_lock_bh(&idev->lock);
2200 for (i = idev->mc_list; i; i = i->next)
2201 igmp6_group_dropped(i);
2202 read_unlock_bh(&idev->lock);
2203 }
2204
2205 void ipv6_mc_remap(struct inet6_dev *idev)
2206 {
2207 ipv6_mc_up(idev);
2208 }
2209
2210 /* Device going down */
2211
2212 void ipv6_mc_down(struct inet6_dev *idev)
2213 {
2214 struct ifmcaddr6 *i;
2215
2216 /* Withdraw multicast list */
2217
2218 read_lock_bh(&idev->lock);
2219 idev->mc_ifc_count = 0;
2220 if (del_timer(&idev->mc_ifc_timer))
2221 __in6_dev_put(idev);
2222 idev->mc_gq_running = 0;
2223 if (del_timer(&idev->mc_gq_timer))
2224 __in6_dev_put(idev);
2225
2226 for (i = idev->mc_list; i; i=i->next)
2227 igmp6_group_dropped(i);
2228 read_unlock_bh(&idev->lock);
2229
2230 mld_clear_delrec(idev);
2231 }
2232
2233
2234 /* Device going up */
2235
2236 void ipv6_mc_up(struct inet6_dev *idev)
2237 {
2238 struct ifmcaddr6 *i;
2239
2240 /* Install multicast list, except for all-nodes (already installed) */
2241
2242 read_lock_bh(&idev->lock);
2243 for (i = idev->mc_list; i; i=i->next)
2244 igmp6_group_added(i);
2245 read_unlock_bh(&idev->lock);
2246 }
2247
2248 /* IPv6 device initialization. */
2249
2250 void ipv6_mc_init_dev(struct inet6_dev *idev)
2251 {
2252 write_lock_bh(&idev->lock);
2253 spin_lock_init(&idev->mc_lock);
2254 idev->mc_gq_running = 0;
2255 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2256 (unsigned long)idev);
2257 idev->mc_tomb = NULL;
2258 idev->mc_ifc_count = 0;
2259 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2260 (unsigned long)idev);
2261 idev->mc_qrv = MLD_QRV_DEFAULT;
2262 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2263 idev->mc_v1_seen = 0;
2264 write_unlock_bh(&idev->lock);
2265 }
2266
2267 /*
2268 * Device is about to be destroyed: clean up.
2269 */
2270
2271 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2272 {
2273 struct ifmcaddr6 *i;
2274
2275 /* Deactivate timers */
2276 ipv6_mc_down(idev);
2277
2278 /* Delete all-nodes address. */
2279 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2280 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2281 * fail.
2282 */
2283 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2284
2285 if (idev->cnf.forwarding)
2286 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2287
2288 write_lock_bh(&idev->lock);
2289 while ((i = idev->mc_list) != NULL) {
2290 idev->mc_list = i->next;
2291 write_unlock_bh(&idev->lock);
2292
2293 igmp6_group_dropped(i);
2294 ma_put(i);
2295
2296 write_lock_bh(&idev->lock);
2297 }
2298 write_unlock_bh(&idev->lock);
2299 }
2300
2301 #ifdef CONFIG_PROC_FS
2302 struct igmp6_mc_iter_state {
2303 struct seq_net_private p;
2304 struct net_device *dev;
2305 struct inet6_dev *idev;
2306 };
2307
2308 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2309
2310 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2311 {
2312 struct ifmcaddr6 *im = NULL;
2313 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2314 struct net *net = seq_file_net(seq);
2315
2316 state->idev = NULL;
2317 for_each_netdev_rcu(net, state->dev) {
2318 struct inet6_dev *idev;
2319 idev = __in6_dev_get(state->dev);
2320 if (!idev)
2321 continue;
2322 read_lock_bh(&idev->lock);
2323 im = idev->mc_list;
2324 if (im) {
2325 state->idev = idev;
2326 break;
2327 }
2328 read_unlock_bh(&idev->lock);
2329 }
2330 return im;
2331 }
2332
2333 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2334 {
2335 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2336
2337 im = im->next;
2338 while (!im) {
2339 if (likely(state->idev != NULL))
2340 read_unlock_bh(&state->idev->lock);
2341
2342 state->dev = next_net_device_rcu(state->dev);
2343 if (!state->dev) {
2344 state->idev = NULL;
2345 break;
2346 }
2347 state->idev = __in6_dev_get(state->dev);
2348 if (!state->idev)
2349 continue;
2350 read_lock_bh(&state->idev->lock);
2351 im = state->idev->mc_list;
2352 }
2353 return im;
2354 }
2355
2356 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2357 {
2358 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2359 if (im)
2360 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2361 --pos;
2362 return pos ? NULL : im;
2363 }
2364
2365 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2366 __acquires(RCU)
2367 {
2368 rcu_read_lock();
2369 return igmp6_mc_get_idx(seq, *pos);
2370 }
2371
2372 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2373 {
2374 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2375
2376 ++*pos;
2377 return im;
2378 }
2379
2380 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2381 __releases(RCU)
2382 {
2383 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2384
2385 if (likely(state->idev != NULL)) {
2386 read_unlock_bh(&state->idev->lock);
2387 state->idev = NULL;
2388 }
2389 state->dev = NULL;
2390 rcu_read_unlock();
2391 }
2392
2393 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2394 {
2395 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2396 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2397
2398 seq_printf(seq,
2399 "%-4d %-15s %pi6 %5d %08X %ld\n",
2400 state->dev->ifindex, state->dev->name,
2401 &im->mca_addr,
2402 im->mca_users, im->mca_flags,
2403 (im->mca_flags&MAF_TIMER_RUNNING) ?
2404 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2405 return 0;
2406 }
2407
2408 static const struct seq_operations igmp6_mc_seq_ops = {
2409 .start = igmp6_mc_seq_start,
2410 .next = igmp6_mc_seq_next,
2411 .stop = igmp6_mc_seq_stop,
2412 .show = igmp6_mc_seq_show,
2413 };
2414
2415 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2416 {
2417 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2418 sizeof(struct igmp6_mc_iter_state));
2419 }
2420
2421 static const struct file_operations igmp6_mc_seq_fops = {
2422 .owner = THIS_MODULE,
2423 .open = igmp6_mc_seq_open,
2424 .read = seq_read,
2425 .llseek = seq_lseek,
2426 .release = seq_release_net,
2427 };
2428
2429 struct igmp6_mcf_iter_state {
2430 struct seq_net_private p;
2431 struct net_device *dev;
2432 struct inet6_dev *idev;
2433 struct ifmcaddr6 *im;
2434 };
2435
2436 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2437
2438 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2439 {
2440 struct ip6_sf_list *psf = NULL;
2441 struct ifmcaddr6 *im = NULL;
2442 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2443 struct net *net = seq_file_net(seq);
2444
2445 state->idev = NULL;
2446 state->im = NULL;
2447 for_each_netdev_rcu(net, state->dev) {
2448 struct inet6_dev *idev;
2449 idev = __in6_dev_get(state->dev);
2450 if (unlikely(idev == NULL))
2451 continue;
2452 read_lock_bh(&idev->lock);
2453 im = idev->mc_list;
2454 if (likely(im != NULL)) {
2455 spin_lock_bh(&im->mca_lock);
2456 psf = im->mca_sources;
2457 if (likely(psf != NULL)) {
2458 state->im = im;
2459 state->idev = idev;
2460 break;
2461 }
2462 spin_unlock_bh(&im->mca_lock);
2463 }
2464 read_unlock_bh(&idev->lock);
2465 }
2466 return psf;
2467 }
2468
2469 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2470 {
2471 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2472
2473 psf = psf->sf_next;
2474 while (!psf) {
2475 spin_unlock_bh(&state->im->mca_lock);
2476 state->im = state->im->next;
2477 while (!state->im) {
2478 if (likely(state->idev != NULL))
2479 read_unlock_bh(&state->idev->lock);
2480
2481 state->dev = next_net_device_rcu(state->dev);
2482 if (!state->dev) {
2483 state->idev = NULL;
2484 goto out;
2485 }
2486 state->idev = __in6_dev_get(state->dev);
2487 if (!state->idev)
2488 continue;
2489 read_lock_bh(&state->idev->lock);
2490 state->im = state->idev->mc_list;
2491 }
2492 if (!state->im)
2493 break;
2494 spin_lock_bh(&state->im->mca_lock);
2495 psf = state->im->mca_sources;
2496 }
2497 out:
2498 return psf;
2499 }
2500
2501 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2502 {
2503 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2504 if (psf)
2505 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2506 --pos;
2507 return pos ? NULL : psf;
2508 }
2509
2510 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2511 __acquires(RCU)
2512 {
2513 rcu_read_lock();
2514 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2515 }
2516
2517 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2518 {
2519 struct ip6_sf_list *psf;
2520 if (v == SEQ_START_TOKEN)
2521 psf = igmp6_mcf_get_first(seq);
2522 else
2523 psf = igmp6_mcf_get_next(seq, v);
2524 ++*pos;
2525 return psf;
2526 }
2527
2528 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2529 __releases(RCU)
2530 {
2531 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2532 if (likely(state->im != NULL)) {
2533 spin_unlock_bh(&state->im->mca_lock);
2534 state->im = NULL;
2535 }
2536 if (likely(state->idev != NULL)) {
2537 read_unlock_bh(&state->idev->lock);
2538 state->idev = NULL;
2539 }
2540 state->dev = NULL;
2541 rcu_read_unlock();
2542 }
2543
2544 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2545 {
2546 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2547 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2548
2549 if (v == SEQ_START_TOKEN) {
2550 seq_printf(seq,
2551 "%3s %6s "
2552 "%32s %32s %6s %6s\n", "Idx",
2553 "Device", "Multicast Address",
2554 "Source Address", "INC", "EXC");
2555 } else {
2556 seq_printf(seq,
2557 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2558 state->dev->ifindex, state->dev->name,
2559 &state->im->mca_addr,
2560 &psf->sf_addr,
2561 psf->sf_count[MCAST_INCLUDE],
2562 psf->sf_count[MCAST_EXCLUDE]);
2563 }
2564 return 0;
2565 }
2566
2567 static const struct seq_operations igmp6_mcf_seq_ops = {
2568 .start = igmp6_mcf_seq_start,
2569 .next = igmp6_mcf_seq_next,
2570 .stop = igmp6_mcf_seq_stop,
2571 .show = igmp6_mcf_seq_show,
2572 };
2573
2574 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2575 {
2576 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2577 sizeof(struct igmp6_mcf_iter_state));
2578 }
2579
2580 static const struct file_operations igmp6_mcf_seq_fops = {
2581 .owner = THIS_MODULE,
2582 .open = igmp6_mcf_seq_open,
2583 .read = seq_read,
2584 .llseek = seq_lseek,
2585 .release = seq_release_net,
2586 };
2587
2588 static int __net_init igmp6_proc_init(struct net *net)
2589 {
2590 int err;
2591
2592 err = -ENOMEM;
2593 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2594 goto out;
2595 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2596 &igmp6_mcf_seq_fops))
2597 goto out_proc_net_igmp6;
2598
2599 err = 0;
2600 out:
2601 return err;
2602
2603 out_proc_net_igmp6:
2604 proc_net_remove(net, "igmp6");
2605 goto out;
2606 }
2607
2608 static void __net_exit igmp6_proc_exit(struct net *net)
2609 {
2610 proc_net_remove(net, "mcfilter6");
2611 proc_net_remove(net, "igmp6");
2612 }
2613 #else
2614 static inline int igmp6_proc_init(struct net *net)
2615 {
2616 return 0;
2617 }
2618 static inline void igmp6_proc_exit(struct net *net)
2619 {
2620 }
2621 #endif
2622
2623 static int __net_init igmp6_net_init(struct net *net)
2624 {
2625 int err;
2626
2627 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2628 SOCK_RAW, IPPROTO_ICMPV6, net);
2629 if (err < 0) {
2630 printk(KERN_ERR
2631 "Failed to initialize the IGMP6 control socket (err %d).\n",
2632 err);
2633 goto out;
2634 }
2635
2636 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2637
2638 err = igmp6_proc_init(net);
2639 if (err)
2640 goto out_sock_create;
2641 out:
2642 return err;
2643
2644 out_sock_create:
2645 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2646 goto out;
2647 }
2648
2649 static void __net_exit igmp6_net_exit(struct net *net)
2650 {
2651 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2652 igmp6_proc_exit(net);
2653 }
2654
2655 static struct pernet_operations igmp6_net_ops = {
2656 .init = igmp6_net_init,
2657 .exit = igmp6_net_exit,
2658 };
2659
2660 int __init igmp6_init(void)
2661 {
2662 return register_pernet_subsys(&igmp6_net_ops);
2663 }
2664
2665 void igmp6_cleanup(void)
2666 {
2667 unregister_pernet_subsys(&igmp6_net_ops);
2668 }