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1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <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, 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, struct in6_addr *pmca,
101 int sfmode, int sfcount, struct in6_addr *psfsrc,
102 int delta);
103 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
104 int sfmode, int sfcount, struct in6_addr *psfsrc,
105 int delta);
106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107 struct inet6_dev *idev);
108
109
110 #define IGMP6_UNSOLICITED_IVAL (10*HZ)
111 #define MLD_QRV_DEFAULT 2
112
113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
114 (idev)->cnf.force_mld_version == 1 || \
115 ((idev)->mc_v1_seen && \
116 time_before(jiffies, (idev)->mc_v1_seen)))
117
118 #define IPV6_MLD_MAX_MSF 64
119
120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
121
122 /*
123 * socket join on multicast group
124 */
125
126 #define for_each_pmc_rcu(np, pmc) \
127 for (pmc = rcu_dereference(np->ipv6_mc_list); \
128 pmc != NULL; \
129 pmc = rcu_dereference(pmc->next))
130
131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
132 {
133 struct net_device *dev = NULL;
134 struct ipv6_mc_socklist *mc_lst;
135 struct ipv6_pinfo *np = inet6_sk(sk);
136 struct net *net = sock_net(sk);
137 int err;
138
139 if (!ipv6_addr_is_multicast(addr))
140 return -EINVAL;
141
142 rcu_read_lock();
143 for_each_pmc_rcu(np, mc_lst) {
144 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145 ipv6_addr_equal(&mc_lst->addr, addr)) {
146 rcu_read_unlock();
147 return -EADDRINUSE;
148 }
149 }
150 rcu_read_unlock();
151
152 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
153
154 if (mc_lst == NULL)
155 return -ENOMEM;
156
157 mc_lst->next = NULL;
158 ipv6_addr_copy(&mc_lst->addr, addr);
159
160 rcu_read_lock();
161 if (ifindex == 0) {
162 struct rt6_info *rt;
163 rt = rt6_lookup(net, addr, NULL, 0, 0);
164 if (rt) {
165 dev = rt->rt6i_dev;
166 dst_release(&rt->dst);
167 }
168 } else
169 dev = dev_get_by_index_rcu(net, ifindex);
170
171 if (dev == NULL) {
172 rcu_read_unlock();
173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174 return -ENODEV;
175 }
176
177 mc_lst->ifindex = dev->ifindex;
178 mc_lst->sfmode = MCAST_EXCLUDE;
179 rwlock_init(&mc_lst->sflock);
180 mc_lst->sflist = NULL;
181
182 /*
183 * now add/increase the group membership on the device
184 */
185
186 err = ipv6_dev_mc_inc(dev, addr);
187
188 if (err) {
189 rcu_read_unlock();
190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191 return err;
192 }
193
194 spin_lock(&ipv6_sk_mc_lock);
195 mc_lst->next = np->ipv6_mc_list;
196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 spin_unlock(&ipv6_sk_mc_lock);
198
199 rcu_read_unlock();
200
201 return 0;
202 }
203
204 static void ipv6_mc_socklist_reclaim(struct rcu_head *head)
205 {
206 kfree(container_of(head, struct ipv6_mc_socklist, rcu));
207 }
208 /*
209 * socket leave on multicast group
210 */
211 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
212 {
213 struct ipv6_pinfo *np = inet6_sk(sk);
214 struct ipv6_mc_socklist *mc_lst;
215 struct ipv6_mc_socklist __rcu **lnk;
216 struct net *net = sock_net(sk);
217
218 spin_lock(&ipv6_sk_mc_lock);
219 for (lnk = &np->ipv6_mc_list;
220 (mc_lst = rcu_dereference_protected(*lnk,
221 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
222 lnk = &mc_lst->next) {
223 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
224 ipv6_addr_equal(&mc_lst->addr, addr)) {
225 struct net_device *dev;
226
227 *lnk = mc_lst->next;
228 spin_unlock(&ipv6_sk_mc_lock);
229
230 rcu_read_lock();
231 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
232 if (dev != NULL) {
233 struct inet6_dev *idev = __in6_dev_get(dev);
234
235 (void) ip6_mc_leave_src(sk, mc_lst, idev);
236 if (idev)
237 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
238 } else
239 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
240 rcu_read_unlock();
241 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
242 call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim);
243 return 0;
244 }
245 }
246 spin_unlock(&ipv6_sk_mc_lock);
247
248 return -EADDRNOTAVAIL;
249 }
250
251 /* called with rcu_read_lock() */
252 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
253 struct in6_addr *group,
254 int ifindex)
255 {
256 struct net_device *dev = NULL;
257 struct inet6_dev *idev = NULL;
258
259 if (ifindex == 0) {
260 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
261
262 if (rt) {
263 dev = rt->rt6i_dev;
264 dev_hold(dev);
265 dst_release(&rt->dst);
266 }
267 } else
268 dev = dev_get_by_index_rcu(net, ifindex);
269
270 if (!dev)
271 return NULL;
272 idev = __in6_dev_get(dev);
273 if (!idev)
274 return NULL;
275 read_lock_bh(&idev->lock);
276 if (idev->dead) {
277 read_unlock_bh(&idev->lock);
278 return NULL;
279 }
280 return idev;
281 }
282
283 void ipv6_sock_mc_close(struct sock *sk)
284 {
285 struct ipv6_pinfo *np = inet6_sk(sk);
286 struct ipv6_mc_socklist *mc_lst;
287 struct net *net = sock_net(sk);
288
289 spin_lock(&ipv6_sk_mc_lock);
290 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
291 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
292 struct net_device *dev;
293
294 np->ipv6_mc_list = mc_lst->next;
295 spin_unlock(&ipv6_sk_mc_lock);
296
297 rcu_read_lock();
298 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
299 if (dev) {
300 struct inet6_dev *idev = __in6_dev_get(dev);
301
302 (void) ip6_mc_leave_src(sk, mc_lst, idev);
303 if (idev)
304 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
305 } else
306 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
307 rcu_read_unlock();
308
309 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
310 call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim);
311
312 spin_lock(&ipv6_sk_mc_lock);
313 }
314 spin_unlock(&ipv6_sk_mc_lock);
315 }
316
317 int ip6_mc_source(int add, int omode, struct sock *sk,
318 struct group_source_req *pgsr)
319 {
320 struct in6_addr *source, *group;
321 struct ipv6_mc_socklist *pmc;
322 struct net_device *dev;
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 dev = idev->dev;
345
346 err = -EADDRNOTAVAIL;
347
348 for_each_pmc_rcu(inet6, pmc) {
349 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
350 continue;
351 if (ipv6_addr_equal(&pmc->addr, group))
352 break;
353 }
354 if (!pmc) { /* must have a prior join */
355 err = -EINVAL;
356 goto done;
357 }
358 /* if a source filter was set, must be the same mode as before */
359 if (pmc->sflist) {
360 if (pmc->sfmode != omode) {
361 err = -EINVAL;
362 goto done;
363 }
364 } else if (pmc->sfmode != omode) {
365 /* allow mode switches for empty-set filters */
366 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
367 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
368 pmc->sfmode = omode;
369 }
370
371 write_lock(&pmc->sflock);
372 pmclocked = 1;
373
374 psl = pmc->sflist;
375 if (!add) {
376 if (!psl)
377 goto done; /* err = -EADDRNOTAVAIL */
378 rv = !0;
379 for (i=0; i<psl->sl_count; i++) {
380 rv = memcmp(&psl->sl_addr[i], source,
381 sizeof(struct in6_addr));
382 if (rv == 0)
383 break;
384 }
385 if (rv) /* source not found */
386 goto done; /* err = -EADDRNOTAVAIL */
387
388 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
389 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
390 leavegroup = 1;
391 goto done;
392 }
393
394 /* update the interface filter */
395 ip6_mc_del_src(idev, group, omode, 1, source, 1);
396
397 for (j=i+1; j<psl->sl_count; j++)
398 psl->sl_addr[j-1] = psl->sl_addr[j];
399 psl->sl_count--;
400 err = 0;
401 goto done;
402 }
403 /* else, add a new source to the filter */
404
405 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
406 err = -ENOBUFS;
407 goto done;
408 }
409 if (!psl || psl->sl_count == psl->sl_max) {
410 struct ip6_sf_socklist *newpsl;
411 int count = IP6_SFBLOCK;
412
413 if (psl)
414 count += psl->sl_max;
415 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
416 if (!newpsl) {
417 err = -ENOBUFS;
418 goto done;
419 }
420 newpsl->sl_max = count;
421 newpsl->sl_count = count - IP6_SFBLOCK;
422 if (psl) {
423 for (i=0; i<psl->sl_count; i++)
424 newpsl->sl_addr[i] = psl->sl_addr[i];
425 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
426 }
427 pmc->sflist = psl = newpsl;
428 }
429 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
430 for (i=0; i<psl->sl_count; i++) {
431 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
432 if (rv == 0)
433 break;
434 }
435 if (rv == 0) /* address already there is an error */
436 goto done;
437 for (j=psl->sl_count-1; j>=i; j--)
438 psl->sl_addr[j+1] = psl->sl_addr[j];
439 psl->sl_addr[i] = *source;
440 psl->sl_count++;
441 err = 0;
442 /* update the interface list */
443 ip6_mc_add_src(idev, group, omode, 1, source, 1);
444 done:
445 if (pmclocked)
446 write_unlock(&pmc->sflock);
447 read_unlock_bh(&idev->lock);
448 rcu_read_unlock();
449 if (leavegroup)
450 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
451 return err;
452 }
453
454 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
455 {
456 struct in6_addr *group;
457 struct ipv6_mc_socklist *pmc;
458 struct net_device *dev;
459 struct inet6_dev *idev;
460 struct ipv6_pinfo *inet6 = inet6_sk(sk);
461 struct ip6_sf_socklist *newpsl, *psl;
462 struct net *net = sock_net(sk);
463 int leavegroup = 0;
464 int i, err;
465
466 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
467
468 if (!ipv6_addr_is_multicast(group))
469 return -EINVAL;
470 if (gsf->gf_fmode != MCAST_INCLUDE &&
471 gsf->gf_fmode != MCAST_EXCLUDE)
472 return -EINVAL;
473
474 rcu_read_lock();
475 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
476
477 if (!idev) {
478 rcu_read_unlock();
479 return -ENODEV;
480 }
481 dev = idev->dev;
482
483 err = 0;
484
485 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
486 leavegroup = 1;
487 goto done;
488 }
489
490 for_each_pmc_rcu(inet6, pmc) {
491 if (pmc->ifindex != gsf->gf_interface)
492 continue;
493 if (ipv6_addr_equal(&pmc->addr, group))
494 break;
495 }
496 if (!pmc) { /* must have a prior join */
497 err = -EINVAL;
498 goto done;
499 }
500 if (gsf->gf_numsrc) {
501 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
502 GFP_ATOMIC);
503 if (!newpsl) {
504 err = -ENOBUFS;
505 goto done;
506 }
507 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
508 for (i=0; i<newpsl->sl_count; ++i) {
509 struct sockaddr_in6 *psin6;
510
511 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
512 newpsl->sl_addr[i] = psin6->sin6_addr;
513 }
514 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
515 newpsl->sl_count, newpsl->sl_addr, 0);
516 if (err) {
517 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
518 goto done;
519 }
520 } else {
521 newpsl = NULL;
522 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
523 }
524
525 write_lock(&pmc->sflock);
526 psl = pmc->sflist;
527 if (psl) {
528 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
529 psl->sl_count, psl->sl_addr, 0);
530 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
531 } else
532 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
533 pmc->sflist = newpsl;
534 pmc->sfmode = gsf->gf_fmode;
535 write_unlock(&pmc->sflock);
536 err = 0;
537 done:
538 read_unlock_bh(&idev->lock);
539 rcu_read_unlock();
540 if (leavegroup)
541 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
542 return err;
543 }
544
545 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
546 struct group_filter __user *optval, int __user *optlen)
547 {
548 int err, i, count, copycount;
549 struct in6_addr *group;
550 struct ipv6_mc_socklist *pmc;
551 struct inet6_dev *idev;
552 struct net_device *dev;
553 struct ipv6_pinfo *inet6 = inet6_sk(sk);
554 struct ip6_sf_socklist *psl;
555 struct net *net = sock_net(sk);
556
557 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
558
559 if (!ipv6_addr_is_multicast(group))
560 return -EINVAL;
561
562 rcu_read_lock();
563 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
564
565 if (!idev) {
566 rcu_read_unlock();
567 return -ENODEV;
568 }
569 dev = idev->dev;
570
571 err = -EADDRNOTAVAIL;
572 /*
573 * changes to the ipv6_mc_list require the socket lock and
574 * a read lock on ip6_sk_mc_lock. We have the socket lock,
575 * so reading the list is safe.
576 */
577
578 for_each_pmc_rcu(inet6, pmc) {
579 if (pmc->ifindex != gsf->gf_interface)
580 continue;
581 if (ipv6_addr_equal(group, &pmc->addr))
582 break;
583 }
584 if (!pmc) /* must have a prior join */
585 goto done;
586 gsf->gf_fmode = pmc->sfmode;
587 psl = pmc->sflist;
588 count = psl ? psl->sl_count : 0;
589 read_unlock_bh(&idev->lock);
590 rcu_read_unlock();
591
592 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
593 gsf->gf_numsrc = count;
594 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
595 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
596 return -EFAULT;
597 }
598 /* changes to psl require the socket lock, a read lock on
599 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
600 * have the socket lock, so reading here is safe.
601 */
602 for (i=0; i<copycount; i++) {
603 struct sockaddr_in6 *psin6;
604 struct sockaddr_storage ss;
605
606 psin6 = (struct sockaddr_in6 *)&ss;
607 memset(&ss, 0, sizeof(ss));
608 psin6->sin6_family = AF_INET6;
609 psin6->sin6_addr = psl->sl_addr[i];
610 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
611 return -EFAULT;
612 }
613 return 0;
614 done:
615 read_unlock_bh(&idev->lock);
616 rcu_read_unlock();
617 return err;
618 }
619
620 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
621 const struct in6_addr *src_addr)
622 {
623 struct ipv6_pinfo *np = inet6_sk(sk);
624 struct ipv6_mc_socklist *mc;
625 struct ip6_sf_socklist *psl;
626 int rv = 1;
627
628 rcu_read_lock();
629 for_each_pmc_rcu(np, mc) {
630 if (ipv6_addr_equal(&mc->addr, mc_addr))
631 break;
632 }
633 if (!mc) {
634 rcu_read_unlock();
635 return 1;
636 }
637 read_lock(&mc->sflock);
638 psl = mc->sflist;
639 if (!psl) {
640 rv = mc->sfmode == MCAST_EXCLUDE;
641 } else {
642 int i;
643
644 for (i=0; i<psl->sl_count; i++) {
645 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
646 break;
647 }
648 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
649 rv = 0;
650 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
651 rv = 0;
652 }
653 read_unlock(&mc->sflock);
654 rcu_read_unlock();
655
656 return rv;
657 }
658
659 static void ma_put(struct ifmcaddr6 *mc)
660 {
661 if (atomic_dec_and_test(&mc->mca_refcnt)) {
662 in6_dev_put(mc->idev);
663 kfree(mc);
664 }
665 }
666
667 static void igmp6_group_added(struct ifmcaddr6 *mc)
668 {
669 struct net_device *dev = mc->idev->dev;
670 char buf[MAX_ADDR_LEN];
671
672 spin_lock_bh(&mc->mca_lock);
673 if (!(mc->mca_flags&MAF_LOADED)) {
674 mc->mca_flags |= MAF_LOADED;
675 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
676 dev_mc_add(dev, buf);
677 }
678 spin_unlock_bh(&mc->mca_lock);
679
680 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
681 return;
682
683 if (MLD_V1_SEEN(mc->idev)) {
684 igmp6_join_group(mc);
685 return;
686 }
687 /* else v2 */
688
689 mc->mca_crcount = mc->idev->mc_qrv;
690 mld_ifc_event(mc->idev);
691 }
692
693 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
694 {
695 struct net_device *dev = mc->idev->dev;
696 char buf[MAX_ADDR_LEN];
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, 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 ipv6_addr_copy(&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 * identify MLD packets for MLD filter exceptions
944 */
945 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
946 {
947 struct icmp6hdr *pic;
948
949 if (nexthdr != IPPROTO_ICMPV6)
950 return 0;
951
952 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
953 return 0;
954
955 pic = icmp6_hdr(skb);
956
957 switch (pic->icmp6_type) {
958 case ICMPV6_MGM_QUERY:
959 case ICMPV6_MGM_REPORT:
960 case ICMPV6_MGM_REDUCTION:
961 case ICMPV6_MLD2_REPORT:
962 return 1;
963 default:
964 break;
965 }
966 return 0;
967 }
968
969 /*
970 * check if the interface/address pair is valid
971 */
972 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
973 const struct in6_addr *src_addr)
974 {
975 struct inet6_dev *idev;
976 struct ifmcaddr6 *mc;
977 int rv = 0;
978
979 rcu_read_lock();
980 idev = __in6_dev_get(dev);
981 if (idev) {
982 read_lock_bh(&idev->lock);
983 for (mc = idev->mc_list; mc; mc=mc->next) {
984 if (ipv6_addr_equal(&mc->mca_addr, group))
985 break;
986 }
987 if (mc) {
988 if (src_addr && !ipv6_addr_any(src_addr)) {
989 struct ip6_sf_list *psf;
990
991 spin_lock_bh(&mc->mca_lock);
992 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
993 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
994 break;
995 }
996 if (psf)
997 rv = psf->sf_count[MCAST_INCLUDE] ||
998 psf->sf_count[MCAST_EXCLUDE] !=
999 mc->mca_sfcount[MCAST_EXCLUDE];
1000 else
1001 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1002 spin_unlock_bh(&mc->mca_lock);
1003 } else
1004 rv = 1; /* don't filter unspecified source */
1005 }
1006 read_unlock_bh(&idev->lock);
1007 }
1008 rcu_read_unlock();
1009 return rv;
1010 }
1011
1012 static void mld_gq_start_timer(struct inet6_dev *idev)
1013 {
1014 int tv = net_random() % idev->mc_maxdelay;
1015
1016 idev->mc_gq_running = 1;
1017 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1018 in6_dev_hold(idev);
1019 }
1020
1021 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1022 {
1023 int tv = net_random() % delay;
1024
1025 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1026 in6_dev_hold(idev);
1027 }
1028
1029 /*
1030 * IGMP handling (alias multicast ICMPv6 messages)
1031 */
1032
1033 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1034 {
1035 unsigned long delay = resptime;
1036
1037 /* Do not start timer for these addresses */
1038 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1039 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1040 return;
1041
1042 if (del_timer(&ma->mca_timer)) {
1043 atomic_dec(&ma->mca_refcnt);
1044 delay = ma->mca_timer.expires - jiffies;
1045 }
1046
1047 if (delay >= resptime) {
1048 if (resptime)
1049 delay = net_random() % resptime;
1050 else
1051 delay = 1;
1052 }
1053 ma->mca_timer.expires = jiffies + delay;
1054 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1055 atomic_inc(&ma->mca_refcnt);
1056 ma->mca_flags |= MAF_TIMER_RUNNING;
1057 }
1058
1059 /* mark EXCLUDE-mode sources */
1060 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1061 struct in6_addr *srcs)
1062 {
1063 struct ip6_sf_list *psf;
1064 int i, scount;
1065
1066 scount = 0;
1067 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1068 if (scount == nsrcs)
1069 break;
1070 for (i=0; i<nsrcs; i++) {
1071 /* skip inactive filters */
1072 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1073 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1074 psf->sf_count[MCAST_EXCLUDE])
1075 continue;
1076 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1077 scount++;
1078 break;
1079 }
1080 }
1081 }
1082 pmc->mca_flags &= ~MAF_GSQUERY;
1083 if (scount == nsrcs) /* all sources excluded */
1084 return 0;
1085 return 1;
1086 }
1087
1088 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1089 struct in6_addr *srcs)
1090 {
1091 struct ip6_sf_list *psf;
1092 int i, scount;
1093
1094 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1095 return mld_xmarksources(pmc, nsrcs, srcs);
1096
1097 /* mark INCLUDE-mode sources */
1098
1099 scount = 0;
1100 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1101 if (scount == nsrcs)
1102 break;
1103 for (i=0; i<nsrcs; i++) {
1104 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1105 psf->sf_gsresp = 1;
1106 scount++;
1107 break;
1108 }
1109 }
1110 }
1111 if (!scount) {
1112 pmc->mca_flags &= ~MAF_GSQUERY;
1113 return 0;
1114 }
1115 pmc->mca_flags |= MAF_GSQUERY;
1116 return 1;
1117 }
1118
1119 /* called with rcu_read_lock() */
1120 int igmp6_event_query(struct sk_buff *skb)
1121 {
1122 struct mld2_query *mlh2 = NULL;
1123 struct ifmcaddr6 *ma;
1124 struct in6_addr *group;
1125 unsigned long max_delay;
1126 struct inet6_dev *idev;
1127 struct mld_msg *mld;
1128 int group_type;
1129 int mark = 0;
1130 int len;
1131
1132 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1133 return -EINVAL;
1134
1135 /* compute payload length excluding extension headers */
1136 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1137 len -= skb_network_header_len(skb);
1138
1139 /* Drop queries with not link local source */
1140 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1141 return -EINVAL;
1142
1143 idev = __in6_dev_get(skb->dev);
1144
1145 if (idev == NULL)
1146 return 0;
1147
1148 mld = (struct mld_msg *)icmp6_hdr(skb);
1149 group = &mld->mld_mca;
1150 group_type = ipv6_addr_type(group);
1151
1152 if (group_type != IPV6_ADDR_ANY &&
1153 !(group_type&IPV6_ADDR_MULTICAST))
1154 return -EINVAL;
1155
1156 if (len == 24) {
1157 int switchback;
1158 /* MLDv1 router present */
1159
1160 /* Translate milliseconds to jiffies */
1161 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1162
1163 switchback = (idev->mc_qrv + 1) * max_delay;
1164 idev->mc_v1_seen = jiffies + switchback;
1165
1166 /* cancel the interface change timer */
1167 idev->mc_ifc_count = 0;
1168 if (del_timer(&idev->mc_ifc_timer))
1169 __in6_dev_put(idev);
1170 /* clear deleted report items */
1171 mld_clear_delrec(idev);
1172 } else if (len >= 28) {
1173 int srcs_offset = sizeof(struct mld2_query) -
1174 sizeof(struct icmp6hdr);
1175 if (!pskb_may_pull(skb, srcs_offset))
1176 return -EINVAL;
1177
1178 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1179 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1180 if (!max_delay)
1181 max_delay = 1;
1182 idev->mc_maxdelay = max_delay;
1183 if (mlh2->mld2q_qrv)
1184 idev->mc_qrv = mlh2->mld2q_qrv;
1185 if (group_type == IPV6_ADDR_ANY) { /* general query */
1186 if (mlh2->mld2q_nsrcs)
1187 return -EINVAL; /* no sources allowed */
1188
1189 mld_gq_start_timer(idev);
1190 return 0;
1191 }
1192 /* mark sources to include, if group & source-specific */
1193 if (mlh2->mld2q_nsrcs != 0) {
1194 if (!pskb_may_pull(skb, srcs_offset +
1195 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1196 return -EINVAL;
1197
1198 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1199 mark = 1;
1200 }
1201 } else
1202 return -EINVAL;
1203
1204 read_lock_bh(&idev->lock);
1205 if (group_type == IPV6_ADDR_ANY) {
1206 for (ma = idev->mc_list; ma; ma=ma->next) {
1207 spin_lock_bh(&ma->mca_lock);
1208 igmp6_group_queried(ma, max_delay);
1209 spin_unlock_bh(&ma->mca_lock);
1210 }
1211 } else {
1212 for (ma = idev->mc_list; ma; ma=ma->next) {
1213 if (!ipv6_addr_equal(group, &ma->mca_addr))
1214 continue;
1215 spin_lock_bh(&ma->mca_lock);
1216 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1217 /* gsquery <- gsquery && mark */
1218 if (!mark)
1219 ma->mca_flags &= ~MAF_GSQUERY;
1220 } else {
1221 /* gsquery <- mark */
1222 if (mark)
1223 ma->mca_flags |= MAF_GSQUERY;
1224 else
1225 ma->mca_flags &= ~MAF_GSQUERY;
1226 }
1227 if (!(ma->mca_flags & MAF_GSQUERY) ||
1228 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1229 igmp6_group_queried(ma, max_delay);
1230 spin_unlock_bh(&ma->mca_lock);
1231 break;
1232 }
1233 }
1234 read_unlock_bh(&idev->lock);
1235
1236 return 0;
1237 }
1238
1239 /* called with rcu_read_lock() */
1240 int igmp6_event_report(struct sk_buff *skb)
1241 {
1242 struct ifmcaddr6 *ma;
1243 struct inet6_dev *idev;
1244 struct mld_msg *mld;
1245 int addr_type;
1246
1247 /* Our own report looped back. Ignore it. */
1248 if (skb->pkt_type == PACKET_LOOPBACK)
1249 return 0;
1250
1251 /* send our report if the MC router may not have heard this report */
1252 if (skb->pkt_type != PACKET_MULTICAST &&
1253 skb->pkt_type != PACKET_BROADCAST)
1254 return 0;
1255
1256 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1257 return -EINVAL;
1258
1259 mld = (struct mld_msg *)icmp6_hdr(skb);
1260
1261 /* Drop reports with not link local source */
1262 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1263 if (addr_type != IPV6_ADDR_ANY &&
1264 !(addr_type&IPV6_ADDR_LINKLOCAL))
1265 return -EINVAL;
1266
1267 idev = __in6_dev_get(skb->dev);
1268 if (idev == NULL)
1269 return -ENODEV;
1270
1271 /*
1272 * Cancel the timer for this group
1273 */
1274
1275 read_lock_bh(&idev->lock);
1276 for (ma = idev->mc_list; ma; ma=ma->next) {
1277 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1278 spin_lock(&ma->mca_lock);
1279 if (del_timer(&ma->mca_timer))
1280 atomic_dec(&ma->mca_refcnt);
1281 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1282 spin_unlock(&ma->mca_lock);
1283 break;
1284 }
1285 }
1286 read_unlock_bh(&idev->lock);
1287 return 0;
1288 }
1289
1290 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1291 int gdeleted, int sdeleted)
1292 {
1293 switch (type) {
1294 case MLD2_MODE_IS_INCLUDE:
1295 case MLD2_MODE_IS_EXCLUDE:
1296 if (gdeleted || sdeleted)
1297 return 0;
1298 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1299 if (pmc->mca_sfmode == MCAST_INCLUDE)
1300 return 1;
1301 /* don't include if this source is excluded
1302 * in all filters
1303 */
1304 if (psf->sf_count[MCAST_INCLUDE])
1305 return type == MLD2_MODE_IS_INCLUDE;
1306 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1307 psf->sf_count[MCAST_EXCLUDE];
1308 }
1309 return 0;
1310 case MLD2_CHANGE_TO_INCLUDE:
1311 if (gdeleted || sdeleted)
1312 return 0;
1313 return psf->sf_count[MCAST_INCLUDE] != 0;
1314 case MLD2_CHANGE_TO_EXCLUDE:
1315 if (gdeleted || sdeleted)
1316 return 0;
1317 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1318 psf->sf_count[MCAST_INCLUDE])
1319 return 0;
1320 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1321 psf->sf_count[MCAST_EXCLUDE];
1322 case MLD2_ALLOW_NEW_SOURCES:
1323 if (gdeleted || !psf->sf_crcount)
1324 return 0;
1325 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1326 case MLD2_BLOCK_OLD_SOURCES:
1327 if (pmc->mca_sfmode == MCAST_INCLUDE)
1328 return gdeleted || (psf->sf_crcount && sdeleted);
1329 return psf->sf_crcount && !gdeleted && !sdeleted;
1330 }
1331 return 0;
1332 }
1333
1334 static int
1335 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1336 {
1337 struct ip6_sf_list *psf;
1338 int scount = 0;
1339
1340 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1341 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1342 continue;
1343 scount++;
1344 }
1345 return scount;
1346 }
1347
1348 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1349 {
1350 struct net *net = dev_net(dev);
1351 struct sock *sk = net->ipv6.igmp_sk;
1352 struct sk_buff *skb;
1353 struct mld2_report *pmr;
1354 struct in6_addr addr_buf;
1355 const struct in6_addr *saddr;
1356 int err;
1357 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1358 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1359 IPV6_TLV_PADN, 0 };
1360
1361 /* we assume size > sizeof(ra) here */
1362 size += LL_ALLOCATED_SPACE(dev);
1363 /* limit our allocations to order-0 page */
1364 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1365 skb = sock_alloc_send_skb(sk, size, 1, &err);
1366
1367 if (!skb)
1368 return NULL;
1369
1370 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1371
1372 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1373 /* <draft-ietf-magma-mld-source-05.txt>:
1374 * use unspecified address as the source address
1375 * when a valid link-local address is not available.
1376 */
1377 saddr = &in6addr_any;
1378 } else
1379 saddr = &addr_buf;
1380
1381 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1382
1383 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1384
1385 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1386 skb_put(skb, sizeof(*pmr));
1387 pmr = (struct mld2_report *)skb_transport_header(skb);
1388 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1389 pmr->mld2r_resv1 = 0;
1390 pmr->mld2r_cksum = 0;
1391 pmr->mld2r_resv2 = 0;
1392 pmr->mld2r_ngrec = 0;
1393 return skb;
1394 }
1395
1396 static void mld_sendpack(struct sk_buff *skb)
1397 {
1398 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1399 struct mld2_report *pmr =
1400 (struct mld2_report *)skb_transport_header(skb);
1401 int payload_len, mldlen;
1402 struct inet6_dev *idev;
1403 struct net *net = dev_net(skb->dev);
1404 int err;
1405 struct flowi fl;
1406 struct dst_entry *dst;
1407
1408 rcu_read_lock();
1409 idev = __in6_dev_get(skb->dev);
1410 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1411
1412 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1413 mldlen = skb->tail - skb->transport_header;
1414 pip6->payload_len = htons(payload_len);
1415
1416 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1417 IPPROTO_ICMPV6,
1418 csum_partial(skb_transport_header(skb),
1419 mldlen, 0));
1420
1421 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1422
1423 if (!dst) {
1424 err = -ENOMEM;
1425 goto err_out;
1426 }
1427
1428 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1429 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1430 skb->dev->ifindex);
1431
1432 dst = xfrm_lookup(net, dst, &fl, NULL, 0);
1433 err = 0;
1434 if (IS_ERR(dst)) {
1435 err = PTR_ERR(dst);
1436 dst = NULL;
1437 }
1438 skb_dst_set(skb, dst);
1439 if (err)
1440 goto err_out;
1441
1442 payload_len = skb->len;
1443
1444 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1445 dst_output);
1446 out:
1447 if (!err) {
1448 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1449 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1450 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1451 } else
1452 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1453
1454 rcu_read_unlock();
1455 return;
1456
1457 err_out:
1458 kfree_skb(skb);
1459 goto out;
1460 }
1461
1462 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1463 {
1464 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1465 }
1466
1467 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1468 int type, struct mld2_grec **ppgr)
1469 {
1470 struct net_device *dev = pmc->idev->dev;
1471 struct mld2_report *pmr;
1472 struct mld2_grec *pgr;
1473
1474 if (!skb)
1475 skb = mld_newpack(dev, dev->mtu);
1476 if (!skb)
1477 return NULL;
1478 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1479 pgr->grec_type = type;
1480 pgr->grec_auxwords = 0;
1481 pgr->grec_nsrcs = 0;
1482 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1483 pmr = (struct mld2_report *)skb_transport_header(skb);
1484 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1485 *ppgr = pgr;
1486 return skb;
1487 }
1488
1489 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1490 skb_tailroom(skb)) : 0)
1491
1492 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1493 int type, int gdeleted, int sdeleted)
1494 {
1495 struct net_device *dev = pmc->idev->dev;
1496 struct mld2_report *pmr;
1497 struct mld2_grec *pgr = NULL;
1498 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1499 int scount, stotal, first, isquery, truncate;
1500
1501 if (pmc->mca_flags & MAF_NOREPORT)
1502 return skb;
1503
1504 isquery = type == MLD2_MODE_IS_INCLUDE ||
1505 type == MLD2_MODE_IS_EXCLUDE;
1506 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1507 type == MLD2_CHANGE_TO_EXCLUDE;
1508
1509 stotal = scount = 0;
1510
1511 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1512
1513 if (!*psf_list)
1514 goto empty_source;
1515
1516 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1517
1518 /* EX and TO_EX get a fresh packet, if needed */
1519 if (truncate) {
1520 if (pmr && pmr->mld2r_ngrec &&
1521 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1522 if (skb)
1523 mld_sendpack(skb);
1524 skb = mld_newpack(dev, dev->mtu);
1525 }
1526 }
1527 first = 1;
1528 psf_prev = NULL;
1529 for (psf=*psf_list; psf; psf=psf_next) {
1530 struct in6_addr *psrc;
1531
1532 psf_next = psf->sf_next;
1533
1534 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1535 psf_prev = psf;
1536 continue;
1537 }
1538
1539 /* clear marks on query responses */
1540 if (isquery)
1541 psf->sf_gsresp = 0;
1542
1543 if (AVAILABLE(skb) < sizeof(*psrc) +
1544 first*sizeof(struct mld2_grec)) {
1545 if (truncate && !first)
1546 break; /* truncate these */
1547 if (pgr)
1548 pgr->grec_nsrcs = htons(scount);
1549 if (skb)
1550 mld_sendpack(skb);
1551 skb = mld_newpack(dev, dev->mtu);
1552 first = 1;
1553 scount = 0;
1554 }
1555 if (first) {
1556 skb = add_grhead(skb, pmc, type, &pgr);
1557 first = 0;
1558 }
1559 if (!skb)
1560 return NULL;
1561 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1562 *psrc = psf->sf_addr;
1563 scount++; stotal++;
1564 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1565 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1566 psf->sf_crcount--;
1567 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1568 if (psf_prev)
1569 psf_prev->sf_next = psf->sf_next;
1570 else
1571 *psf_list = psf->sf_next;
1572 kfree(psf);
1573 continue;
1574 }
1575 }
1576 psf_prev = psf;
1577 }
1578
1579 empty_source:
1580 if (!stotal) {
1581 if (type == MLD2_ALLOW_NEW_SOURCES ||
1582 type == MLD2_BLOCK_OLD_SOURCES)
1583 return skb;
1584 if (pmc->mca_crcount || isquery) {
1585 /* make sure we have room for group header */
1586 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1587 mld_sendpack(skb);
1588 skb = NULL; /* add_grhead will get a new one */
1589 }
1590 skb = add_grhead(skb, pmc, type, &pgr);
1591 }
1592 }
1593 if (pgr)
1594 pgr->grec_nsrcs = htons(scount);
1595
1596 if (isquery)
1597 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1598 return skb;
1599 }
1600
1601 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1602 {
1603 struct sk_buff *skb = NULL;
1604 int type;
1605
1606 if (!pmc) {
1607 read_lock_bh(&idev->lock);
1608 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1609 if (pmc->mca_flags & MAF_NOREPORT)
1610 continue;
1611 spin_lock_bh(&pmc->mca_lock);
1612 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1613 type = MLD2_MODE_IS_EXCLUDE;
1614 else
1615 type = MLD2_MODE_IS_INCLUDE;
1616 skb = add_grec(skb, pmc, type, 0, 0);
1617 spin_unlock_bh(&pmc->mca_lock);
1618 }
1619 read_unlock_bh(&idev->lock);
1620 } else {
1621 spin_lock_bh(&pmc->mca_lock);
1622 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1623 type = MLD2_MODE_IS_EXCLUDE;
1624 else
1625 type = MLD2_MODE_IS_INCLUDE;
1626 skb = add_grec(skb, pmc, type, 0, 0);
1627 spin_unlock_bh(&pmc->mca_lock);
1628 }
1629 if (skb)
1630 mld_sendpack(skb);
1631 }
1632
1633 /*
1634 * remove zero-count source records from a source filter list
1635 */
1636 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1637 {
1638 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1639
1640 psf_prev = NULL;
1641 for (psf=*ppsf; psf; psf = psf_next) {
1642 psf_next = psf->sf_next;
1643 if (psf->sf_crcount == 0) {
1644 if (psf_prev)
1645 psf_prev->sf_next = psf->sf_next;
1646 else
1647 *ppsf = psf->sf_next;
1648 kfree(psf);
1649 } else
1650 psf_prev = psf;
1651 }
1652 }
1653
1654 static void mld_send_cr(struct inet6_dev *idev)
1655 {
1656 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1657 struct sk_buff *skb = NULL;
1658 int type, dtype;
1659
1660 read_lock_bh(&idev->lock);
1661 spin_lock(&idev->mc_lock);
1662
1663 /* deleted MCA's */
1664 pmc_prev = NULL;
1665 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1666 pmc_next = pmc->next;
1667 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1668 type = MLD2_BLOCK_OLD_SOURCES;
1669 dtype = MLD2_BLOCK_OLD_SOURCES;
1670 skb = add_grec(skb, pmc, type, 1, 0);
1671 skb = add_grec(skb, pmc, dtype, 1, 1);
1672 }
1673 if (pmc->mca_crcount) {
1674 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1675 type = MLD2_CHANGE_TO_INCLUDE;
1676 skb = add_grec(skb, pmc, type, 1, 0);
1677 }
1678 pmc->mca_crcount--;
1679 if (pmc->mca_crcount == 0) {
1680 mld_clear_zeros(&pmc->mca_tomb);
1681 mld_clear_zeros(&pmc->mca_sources);
1682 }
1683 }
1684 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1685 !pmc->mca_sources) {
1686 if (pmc_prev)
1687 pmc_prev->next = pmc_next;
1688 else
1689 idev->mc_tomb = pmc_next;
1690 in6_dev_put(pmc->idev);
1691 kfree(pmc);
1692 } else
1693 pmc_prev = pmc;
1694 }
1695 spin_unlock(&idev->mc_lock);
1696
1697 /* change recs */
1698 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1699 spin_lock_bh(&pmc->mca_lock);
1700 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1701 type = MLD2_BLOCK_OLD_SOURCES;
1702 dtype = MLD2_ALLOW_NEW_SOURCES;
1703 } else {
1704 type = MLD2_ALLOW_NEW_SOURCES;
1705 dtype = MLD2_BLOCK_OLD_SOURCES;
1706 }
1707 skb = add_grec(skb, pmc, type, 0, 0);
1708 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1709
1710 /* filter mode changes */
1711 if (pmc->mca_crcount) {
1712 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1713 type = MLD2_CHANGE_TO_EXCLUDE;
1714 else
1715 type = MLD2_CHANGE_TO_INCLUDE;
1716 skb = add_grec(skb, pmc, type, 0, 0);
1717 pmc->mca_crcount--;
1718 }
1719 spin_unlock_bh(&pmc->mca_lock);
1720 }
1721 read_unlock_bh(&idev->lock);
1722 if (!skb)
1723 return;
1724 (void) mld_sendpack(skb);
1725 }
1726
1727 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1728 {
1729 struct net *net = dev_net(dev);
1730 struct sock *sk = net->ipv6.igmp_sk;
1731 struct inet6_dev *idev;
1732 struct sk_buff *skb;
1733 struct mld_msg *hdr;
1734 const struct in6_addr *snd_addr, *saddr;
1735 struct in6_addr addr_buf;
1736 int err, len, payload_len, full_len;
1737 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1738 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1739 IPV6_TLV_PADN, 0 };
1740 struct flowi fl;
1741 struct dst_entry *dst;
1742
1743 if (type == ICMPV6_MGM_REDUCTION)
1744 snd_addr = &in6addr_linklocal_allrouters;
1745 else
1746 snd_addr = addr;
1747
1748 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1749 payload_len = len + sizeof(ra);
1750 full_len = sizeof(struct ipv6hdr) + payload_len;
1751
1752 rcu_read_lock();
1753 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1754 IPSTATS_MIB_OUT, full_len);
1755 rcu_read_unlock();
1756
1757 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1758
1759 if (skb == NULL) {
1760 rcu_read_lock();
1761 IP6_INC_STATS(net, __in6_dev_get(dev),
1762 IPSTATS_MIB_OUTDISCARDS);
1763 rcu_read_unlock();
1764 return;
1765 }
1766
1767 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1768
1769 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1770 /* <draft-ietf-magma-mld-source-05.txt>:
1771 * use unspecified address as the source address
1772 * when a valid link-local address is not available.
1773 */
1774 saddr = &in6addr_any;
1775 } else
1776 saddr = &addr_buf;
1777
1778 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1779
1780 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1781
1782 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1783 memset(hdr, 0, sizeof(struct mld_msg));
1784 hdr->mld_type = type;
1785 ipv6_addr_copy(&hdr->mld_mca, addr);
1786
1787 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1788 IPPROTO_ICMPV6,
1789 csum_partial(hdr, len, 0));
1790
1791 rcu_read_lock();
1792 idev = __in6_dev_get(skb->dev);
1793
1794 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1795 if (!dst) {
1796 err = -ENOMEM;
1797 goto err_out;
1798 }
1799
1800 icmpv6_flow_init(sk, &fl, type,
1801 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1802 skb->dev->ifindex);
1803
1804 dst = xfrm_lookup(net, dst, &fl, NULL, 0);
1805 if (IS_ERR(dst)) {
1806 err = PTR_ERR(dst);
1807 goto err_out;
1808 }
1809
1810 skb_dst_set(skb, dst);
1811 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1812 dst_output);
1813 out:
1814 if (!err) {
1815 ICMP6MSGOUT_INC_STATS(net, idev, type);
1816 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1817 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1818 } else
1819 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1820
1821 rcu_read_unlock();
1822 return;
1823
1824 err_out:
1825 kfree_skb(skb);
1826 goto out;
1827 }
1828
1829 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1830 struct in6_addr *psfsrc)
1831 {
1832 struct ip6_sf_list *psf, *psf_prev;
1833 int rv = 0;
1834
1835 psf_prev = NULL;
1836 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1837 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1838 break;
1839 psf_prev = psf;
1840 }
1841 if (!psf || psf->sf_count[sfmode] == 0) {
1842 /* source filter not found, or count wrong => bug */
1843 return -ESRCH;
1844 }
1845 psf->sf_count[sfmode]--;
1846 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1847 struct inet6_dev *idev = pmc->idev;
1848
1849 /* no more filters for this source */
1850 if (psf_prev)
1851 psf_prev->sf_next = psf->sf_next;
1852 else
1853 pmc->mca_sources = psf->sf_next;
1854 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1855 !MLD_V1_SEEN(idev)) {
1856 psf->sf_crcount = idev->mc_qrv;
1857 psf->sf_next = pmc->mca_tomb;
1858 pmc->mca_tomb = psf;
1859 rv = 1;
1860 } else
1861 kfree(psf);
1862 }
1863 return rv;
1864 }
1865
1866 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1867 int sfmode, int sfcount, struct in6_addr *psfsrc,
1868 int delta)
1869 {
1870 struct ifmcaddr6 *pmc;
1871 int changerec = 0;
1872 int i, err;
1873
1874 if (!idev)
1875 return -ENODEV;
1876 read_lock_bh(&idev->lock);
1877 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1878 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1879 break;
1880 }
1881 if (!pmc) {
1882 /* MCA not found?? bug */
1883 read_unlock_bh(&idev->lock);
1884 return -ESRCH;
1885 }
1886 spin_lock_bh(&pmc->mca_lock);
1887 sf_markstate(pmc);
1888 if (!delta) {
1889 if (!pmc->mca_sfcount[sfmode]) {
1890 spin_unlock_bh(&pmc->mca_lock);
1891 read_unlock_bh(&idev->lock);
1892 return -EINVAL;
1893 }
1894 pmc->mca_sfcount[sfmode]--;
1895 }
1896 err = 0;
1897 for (i=0; i<sfcount; i++) {
1898 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1899
1900 changerec |= rv > 0;
1901 if (!err && rv < 0)
1902 err = rv;
1903 }
1904 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1905 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1906 pmc->mca_sfcount[MCAST_INCLUDE]) {
1907 struct ip6_sf_list *psf;
1908
1909 /* filter mode change */
1910 pmc->mca_sfmode = MCAST_INCLUDE;
1911 pmc->mca_crcount = idev->mc_qrv;
1912 idev->mc_ifc_count = pmc->mca_crcount;
1913 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1914 psf->sf_crcount = 0;
1915 mld_ifc_event(pmc->idev);
1916 } else if (sf_setstate(pmc) || changerec)
1917 mld_ifc_event(pmc->idev);
1918 spin_unlock_bh(&pmc->mca_lock);
1919 read_unlock_bh(&idev->lock);
1920 return err;
1921 }
1922
1923 /*
1924 * Add multicast single-source filter to the interface list
1925 */
1926 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1927 struct in6_addr *psfsrc, int delta)
1928 {
1929 struct ip6_sf_list *psf, *psf_prev;
1930
1931 psf_prev = NULL;
1932 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1933 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1934 break;
1935 psf_prev = psf;
1936 }
1937 if (!psf) {
1938 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1939 if (!psf)
1940 return -ENOBUFS;
1941
1942 psf->sf_addr = *psfsrc;
1943 if (psf_prev) {
1944 psf_prev->sf_next = psf;
1945 } else
1946 pmc->mca_sources = psf;
1947 }
1948 psf->sf_count[sfmode]++;
1949 return 0;
1950 }
1951
1952 static void sf_markstate(struct ifmcaddr6 *pmc)
1953 {
1954 struct ip6_sf_list *psf;
1955 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1956
1957 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1958 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1959 psf->sf_oldin = mca_xcount ==
1960 psf->sf_count[MCAST_EXCLUDE] &&
1961 !psf->sf_count[MCAST_INCLUDE];
1962 } else
1963 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1964 }
1965
1966 static int sf_setstate(struct ifmcaddr6 *pmc)
1967 {
1968 struct ip6_sf_list *psf, *dpsf;
1969 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1970 int qrv = pmc->idev->mc_qrv;
1971 int new_in, rv;
1972
1973 rv = 0;
1974 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1975 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1976 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1977 !psf->sf_count[MCAST_INCLUDE];
1978 } else
1979 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1980 if (new_in) {
1981 if (!psf->sf_oldin) {
1982 struct ip6_sf_list *prev = NULL;
1983
1984 for (dpsf=pmc->mca_tomb; dpsf;
1985 dpsf=dpsf->sf_next) {
1986 if (ipv6_addr_equal(&dpsf->sf_addr,
1987 &psf->sf_addr))
1988 break;
1989 prev = dpsf;
1990 }
1991 if (dpsf) {
1992 if (prev)
1993 prev->sf_next = dpsf->sf_next;
1994 else
1995 pmc->mca_tomb = dpsf->sf_next;
1996 kfree(dpsf);
1997 }
1998 psf->sf_crcount = qrv;
1999 rv++;
2000 }
2001 } else if (psf->sf_oldin) {
2002 psf->sf_crcount = 0;
2003 /*
2004 * add or update "delete" records if an active filter
2005 * is now inactive
2006 */
2007 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2008 if (ipv6_addr_equal(&dpsf->sf_addr,
2009 &psf->sf_addr))
2010 break;
2011 if (!dpsf) {
2012 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2013 if (!dpsf)
2014 continue;
2015 *dpsf = *psf;
2016 /* pmc->mca_lock held by callers */
2017 dpsf->sf_next = pmc->mca_tomb;
2018 pmc->mca_tomb = dpsf;
2019 }
2020 dpsf->sf_crcount = qrv;
2021 rv++;
2022 }
2023 }
2024 return rv;
2025 }
2026
2027 /*
2028 * Add multicast source filter list to the interface list
2029 */
2030 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2031 int sfmode, int sfcount, struct in6_addr *psfsrc,
2032 int delta)
2033 {
2034 struct ifmcaddr6 *pmc;
2035 int isexclude;
2036 int i, err;
2037
2038 if (!idev)
2039 return -ENODEV;
2040 read_lock_bh(&idev->lock);
2041 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2042 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2043 break;
2044 }
2045 if (!pmc) {
2046 /* MCA not found?? bug */
2047 read_unlock_bh(&idev->lock);
2048 return -ESRCH;
2049 }
2050 spin_lock_bh(&pmc->mca_lock);
2051
2052 sf_markstate(pmc);
2053 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2054 if (!delta)
2055 pmc->mca_sfcount[sfmode]++;
2056 err = 0;
2057 for (i=0; i<sfcount; i++) {
2058 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2059 if (err)
2060 break;
2061 }
2062 if (err) {
2063 int j;
2064
2065 if (!delta)
2066 pmc->mca_sfcount[sfmode]--;
2067 for (j=0; j<i; j++)
2068 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2069 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2070 struct ip6_sf_list *psf;
2071
2072 /* filter mode change */
2073 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2074 pmc->mca_sfmode = MCAST_EXCLUDE;
2075 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2076 pmc->mca_sfmode = MCAST_INCLUDE;
2077 /* else no filters; keep old mode for reports */
2078
2079 pmc->mca_crcount = idev->mc_qrv;
2080 idev->mc_ifc_count = pmc->mca_crcount;
2081 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2082 psf->sf_crcount = 0;
2083 mld_ifc_event(idev);
2084 } else if (sf_setstate(pmc))
2085 mld_ifc_event(idev);
2086 spin_unlock_bh(&pmc->mca_lock);
2087 read_unlock_bh(&idev->lock);
2088 return err;
2089 }
2090
2091 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2092 {
2093 struct ip6_sf_list *psf, *nextpsf;
2094
2095 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2096 nextpsf = psf->sf_next;
2097 kfree(psf);
2098 }
2099 pmc->mca_tomb = NULL;
2100 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2101 nextpsf = psf->sf_next;
2102 kfree(psf);
2103 }
2104 pmc->mca_sources = NULL;
2105 pmc->mca_sfmode = MCAST_EXCLUDE;
2106 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2107 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2108 }
2109
2110
2111 static void igmp6_join_group(struct ifmcaddr6 *ma)
2112 {
2113 unsigned long delay;
2114
2115 if (ma->mca_flags & MAF_NOREPORT)
2116 return;
2117
2118 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2119
2120 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2121
2122 spin_lock_bh(&ma->mca_lock);
2123 if (del_timer(&ma->mca_timer)) {
2124 atomic_dec(&ma->mca_refcnt);
2125 delay = ma->mca_timer.expires - jiffies;
2126 }
2127
2128 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2129 atomic_inc(&ma->mca_refcnt);
2130 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2131 spin_unlock_bh(&ma->mca_lock);
2132 }
2133
2134 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2135 struct inet6_dev *idev)
2136 {
2137 int err;
2138
2139 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2140 * so no other readers or writers of iml or its sflist
2141 */
2142 if (!iml->sflist) {
2143 /* any-source empty exclude case */
2144 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2145 }
2146 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2147 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2148 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2149 iml->sflist = NULL;
2150 return err;
2151 }
2152
2153 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2154 {
2155 if (MLD_V1_SEEN(ma->idev)) {
2156 if (ma->mca_flags & MAF_LAST_REPORTER)
2157 igmp6_send(&ma->mca_addr, ma->idev->dev,
2158 ICMPV6_MGM_REDUCTION);
2159 } else {
2160 mld_add_delrec(ma->idev, ma);
2161 mld_ifc_event(ma->idev);
2162 }
2163 }
2164
2165 static void mld_gq_timer_expire(unsigned long data)
2166 {
2167 struct inet6_dev *idev = (struct inet6_dev *)data;
2168
2169 idev->mc_gq_running = 0;
2170 mld_send_report(idev, NULL);
2171 __in6_dev_put(idev);
2172 }
2173
2174 static void mld_ifc_timer_expire(unsigned long data)
2175 {
2176 struct inet6_dev *idev = (struct inet6_dev *)data;
2177
2178 mld_send_cr(idev);
2179 if (idev->mc_ifc_count) {
2180 idev->mc_ifc_count--;
2181 if (idev->mc_ifc_count)
2182 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2183 }
2184 __in6_dev_put(idev);
2185 }
2186
2187 static void mld_ifc_event(struct inet6_dev *idev)
2188 {
2189 if (MLD_V1_SEEN(idev))
2190 return;
2191 idev->mc_ifc_count = idev->mc_qrv;
2192 mld_ifc_start_timer(idev, 1);
2193 }
2194
2195
2196 static void igmp6_timer_handler(unsigned long data)
2197 {
2198 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2199
2200 if (MLD_V1_SEEN(ma->idev))
2201 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2202 else
2203 mld_send_report(ma->idev, ma);
2204
2205 spin_lock(&ma->mca_lock);
2206 ma->mca_flags |= MAF_LAST_REPORTER;
2207 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2208 spin_unlock(&ma->mca_lock);
2209 ma_put(ma);
2210 }
2211
2212 /* Device changing type */
2213
2214 void ipv6_mc_unmap(struct inet6_dev *idev)
2215 {
2216 struct ifmcaddr6 *i;
2217
2218 /* Install multicast list, except for all-nodes (already installed) */
2219
2220 read_lock_bh(&idev->lock);
2221 for (i = idev->mc_list; i; i = i->next)
2222 igmp6_group_dropped(i);
2223 read_unlock_bh(&idev->lock);
2224 }
2225
2226 void ipv6_mc_remap(struct inet6_dev *idev)
2227 {
2228 ipv6_mc_up(idev);
2229 }
2230
2231 /* Device going down */
2232
2233 void ipv6_mc_down(struct inet6_dev *idev)
2234 {
2235 struct ifmcaddr6 *i;
2236
2237 /* Withdraw multicast list */
2238
2239 read_lock_bh(&idev->lock);
2240 idev->mc_ifc_count = 0;
2241 if (del_timer(&idev->mc_ifc_timer))
2242 __in6_dev_put(idev);
2243 idev->mc_gq_running = 0;
2244 if (del_timer(&idev->mc_gq_timer))
2245 __in6_dev_put(idev);
2246
2247 for (i = idev->mc_list; i; i=i->next)
2248 igmp6_group_dropped(i);
2249 read_unlock_bh(&idev->lock);
2250
2251 mld_clear_delrec(idev);
2252 }
2253
2254
2255 /* Device going up */
2256
2257 void ipv6_mc_up(struct inet6_dev *idev)
2258 {
2259 struct ifmcaddr6 *i;
2260
2261 /* Install multicast list, except for all-nodes (already installed) */
2262
2263 read_lock_bh(&idev->lock);
2264 for (i = idev->mc_list; i; i=i->next)
2265 igmp6_group_added(i);
2266 read_unlock_bh(&idev->lock);
2267 }
2268
2269 /* IPv6 device initialization. */
2270
2271 void ipv6_mc_init_dev(struct inet6_dev *idev)
2272 {
2273 write_lock_bh(&idev->lock);
2274 spin_lock_init(&idev->mc_lock);
2275 idev->mc_gq_running = 0;
2276 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2277 (unsigned long)idev);
2278 idev->mc_tomb = NULL;
2279 idev->mc_ifc_count = 0;
2280 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2281 (unsigned long)idev);
2282 idev->mc_qrv = MLD_QRV_DEFAULT;
2283 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2284 idev->mc_v1_seen = 0;
2285 write_unlock_bh(&idev->lock);
2286 }
2287
2288 /*
2289 * Device is about to be destroyed: clean up.
2290 */
2291
2292 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2293 {
2294 struct ifmcaddr6 *i;
2295
2296 /* Deactivate timers */
2297 ipv6_mc_down(idev);
2298
2299 /* Delete all-nodes address. */
2300 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2301 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2302 * fail.
2303 */
2304 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2305
2306 if (idev->cnf.forwarding)
2307 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2308
2309 write_lock_bh(&idev->lock);
2310 while ((i = idev->mc_list) != NULL) {
2311 idev->mc_list = i->next;
2312 write_unlock_bh(&idev->lock);
2313
2314 igmp6_group_dropped(i);
2315 ma_put(i);
2316
2317 write_lock_bh(&idev->lock);
2318 }
2319 write_unlock_bh(&idev->lock);
2320 }
2321
2322 #ifdef CONFIG_PROC_FS
2323 struct igmp6_mc_iter_state {
2324 struct seq_net_private p;
2325 struct net_device *dev;
2326 struct inet6_dev *idev;
2327 };
2328
2329 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2330
2331 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2332 {
2333 struct ifmcaddr6 *im = NULL;
2334 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2335 struct net *net = seq_file_net(seq);
2336
2337 state->idev = NULL;
2338 for_each_netdev_rcu(net, state->dev) {
2339 struct inet6_dev *idev;
2340 idev = __in6_dev_get(state->dev);
2341 if (!idev)
2342 continue;
2343 read_lock_bh(&idev->lock);
2344 im = idev->mc_list;
2345 if (im) {
2346 state->idev = idev;
2347 break;
2348 }
2349 read_unlock_bh(&idev->lock);
2350 }
2351 return im;
2352 }
2353
2354 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2355 {
2356 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2357
2358 im = im->next;
2359 while (!im) {
2360 if (likely(state->idev != NULL))
2361 read_unlock_bh(&state->idev->lock);
2362
2363 state->dev = next_net_device_rcu(state->dev);
2364 if (!state->dev) {
2365 state->idev = NULL;
2366 break;
2367 }
2368 state->idev = __in6_dev_get(state->dev);
2369 if (!state->idev)
2370 continue;
2371 read_lock_bh(&state->idev->lock);
2372 im = state->idev->mc_list;
2373 }
2374 return im;
2375 }
2376
2377 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2378 {
2379 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2380 if (im)
2381 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2382 --pos;
2383 return pos ? NULL : im;
2384 }
2385
2386 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2387 __acquires(RCU)
2388 {
2389 rcu_read_lock();
2390 return igmp6_mc_get_idx(seq, *pos);
2391 }
2392
2393 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2394 {
2395 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2396
2397 ++*pos;
2398 return im;
2399 }
2400
2401 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2402 __releases(RCU)
2403 {
2404 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2405
2406 if (likely(state->idev != NULL)) {
2407 read_unlock_bh(&state->idev->lock);
2408 state->idev = NULL;
2409 }
2410 state->dev = NULL;
2411 rcu_read_unlock();
2412 }
2413
2414 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2415 {
2416 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2417 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2418
2419 seq_printf(seq,
2420 "%-4d %-15s %pi6 %5d %08X %ld\n",
2421 state->dev->ifindex, state->dev->name,
2422 &im->mca_addr,
2423 im->mca_users, im->mca_flags,
2424 (im->mca_flags&MAF_TIMER_RUNNING) ?
2425 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2426 return 0;
2427 }
2428
2429 static const struct seq_operations igmp6_mc_seq_ops = {
2430 .start = igmp6_mc_seq_start,
2431 .next = igmp6_mc_seq_next,
2432 .stop = igmp6_mc_seq_stop,
2433 .show = igmp6_mc_seq_show,
2434 };
2435
2436 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2437 {
2438 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2439 sizeof(struct igmp6_mc_iter_state));
2440 }
2441
2442 static const struct file_operations igmp6_mc_seq_fops = {
2443 .owner = THIS_MODULE,
2444 .open = igmp6_mc_seq_open,
2445 .read = seq_read,
2446 .llseek = seq_lseek,
2447 .release = seq_release_net,
2448 };
2449
2450 struct igmp6_mcf_iter_state {
2451 struct seq_net_private p;
2452 struct net_device *dev;
2453 struct inet6_dev *idev;
2454 struct ifmcaddr6 *im;
2455 };
2456
2457 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2458
2459 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2460 {
2461 struct ip6_sf_list *psf = NULL;
2462 struct ifmcaddr6 *im = NULL;
2463 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2464 struct net *net = seq_file_net(seq);
2465
2466 state->idev = NULL;
2467 state->im = NULL;
2468 for_each_netdev_rcu(net, state->dev) {
2469 struct inet6_dev *idev;
2470 idev = __in6_dev_get(state->dev);
2471 if (unlikely(idev == NULL))
2472 continue;
2473 read_lock_bh(&idev->lock);
2474 im = idev->mc_list;
2475 if (likely(im != NULL)) {
2476 spin_lock_bh(&im->mca_lock);
2477 psf = im->mca_sources;
2478 if (likely(psf != NULL)) {
2479 state->im = im;
2480 state->idev = idev;
2481 break;
2482 }
2483 spin_unlock_bh(&im->mca_lock);
2484 }
2485 read_unlock_bh(&idev->lock);
2486 }
2487 return psf;
2488 }
2489
2490 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2491 {
2492 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2493
2494 psf = psf->sf_next;
2495 while (!psf) {
2496 spin_unlock_bh(&state->im->mca_lock);
2497 state->im = state->im->next;
2498 while (!state->im) {
2499 if (likely(state->idev != NULL))
2500 read_unlock_bh(&state->idev->lock);
2501
2502 state->dev = next_net_device_rcu(state->dev);
2503 if (!state->dev) {
2504 state->idev = NULL;
2505 goto out;
2506 }
2507 state->idev = __in6_dev_get(state->dev);
2508 if (!state->idev)
2509 continue;
2510 read_lock_bh(&state->idev->lock);
2511 state->im = state->idev->mc_list;
2512 }
2513 if (!state->im)
2514 break;
2515 spin_lock_bh(&state->im->mca_lock);
2516 psf = state->im->mca_sources;
2517 }
2518 out:
2519 return psf;
2520 }
2521
2522 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2523 {
2524 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2525 if (psf)
2526 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2527 --pos;
2528 return pos ? NULL : psf;
2529 }
2530
2531 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2532 __acquires(RCU)
2533 {
2534 rcu_read_lock();
2535 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2536 }
2537
2538 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2539 {
2540 struct ip6_sf_list *psf;
2541 if (v == SEQ_START_TOKEN)
2542 psf = igmp6_mcf_get_first(seq);
2543 else
2544 psf = igmp6_mcf_get_next(seq, v);
2545 ++*pos;
2546 return psf;
2547 }
2548
2549 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2550 __releases(RCU)
2551 {
2552 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2553 if (likely(state->im != NULL)) {
2554 spin_unlock_bh(&state->im->mca_lock);
2555 state->im = NULL;
2556 }
2557 if (likely(state->idev != NULL)) {
2558 read_unlock_bh(&state->idev->lock);
2559 state->idev = NULL;
2560 }
2561 state->dev = NULL;
2562 rcu_read_unlock();
2563 }
2564
2565 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2566 {
2567 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2568 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2569
2570 if (v == SEQ_START_TOKEN) {
2571 seq_printf(seq,
2572 "%3s %6s "
2573 "%32s %32s %6s %6s\n", "Idx",
2574 "Device", "Multicast Address",
2575 "Source Address", "INC", "EXC");
2576 } else {
2577 seq_printf(seq,
2578 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2579 state->dev->ifindex, state->dev->name,
2580 &state->im->mca_addr,
2581 &psf->sf_addr,
2582 psf->sf_count[MCAST_INCLUDE],
2583 psf->sf_count[MCAST_EXCLUDE]);
2584 }
2585 return 0;
2586 }
2587
2588 static const struct seq_operations igmp6_mcf_seq_ops = {
2589 .start = igmp6_mcf_seq_start,
2590 .next = igmp6_mcf_seq_next,
2591 .stop = igmp6_mcf_seq_stop,
2592 .show = igmp6_mcf_seq_show,
2593 };
2594
2595 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2596 {
2597 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2598 sizeof(struct igmp6_mcf_iter_state));
2599 }
2600
2601 static const struct file_operations igmp6_mcf_seq_fops = {
2602 .owner = THIS_MODULE,
2603 .open = igmp6_mcf_seq_open,
2604 .read = seq_read,
2605 .llseek = seq_lseek,
2606 .release = seq_release_net,
2607 };
2608
2609 static int __net_init igmp6_proc_init(struct net *net)
2610 {
2611 int err;
2612
2613 err = -ENOMEM;
2614 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2615 goto out;
2616 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2617 &igmp6_mcf_seq_fops))
2618 goto out_proc_net_igmp6;
2619
2620 err = 0;
2621 out:
2622 return err;
2623
2624 out_proc_net_igmp6:
2625 proc_net_remove(net, "igmp6");
2626 goto out;
2627 }
2628
2629 static void __net_exit igmp6_proc_exit(struct net *net)
2630 {
2631 proc_net_remove(net, "mcfilter6");
2632 proc_net_remove(net, "igmp6");
2633 }
2634 #else
2635 static inline int igmp6_proc_init(struct net *net)
2636 {
2637 return 0;
2638 }
2639 static inline void igmp6_proc_exit(struct net *net)
2640 {
2641 }
2642 #endif
2643
2644 static int __net_init igmp6_net_init(struct net *net)
2645 {
2646 int err;
2647
2648 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2649 SOCK_RAW, IPPROTO_ICMPV6, net);
2650 if (err < 0) {
2651 printk(KERN_ERR
2652 "Failed to initialize the IGMP6 control socket (err %d).\n",
2653 err);
2654 goto out;
2655 }
2656
2657 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2658
2659 err = igmp6_proc_init(net);
2660 if (err)
2661 goto out_sock_create;
2662 out:
2663 return err;
2664
2665 out_sock_create:
2666 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2667 goto out;
2668 }
2669
2670 static void __net_exit igmp6_net_exit(struct net *net)
2671 {
2672 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2673 igmp6_proc_exit(net);
2674 }
2675
2676 static struct pernet_operations igmp6_net_ops = {
2677 .init = igmp6_net_init,
2678 .exit = igmp6_net_exit,
2679 };
2680
2681 int __init igmp6_init(void)
2682 {
2683 return register_pernet_subsys(&igmp6_net_ops);
2684 }
2685
2686 void igmp6_cleanup(void)
2687 {
2688 unregister_pernet_subsys(&igmp6_net_ops);
2689 }
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