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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / mcast.c
blob6cc4d1fb8c132fb680353d70cac47c17598c326b
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->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 /*
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->rt6i_dev;
260 dev_hold(dev);
261 dst_release(&rt->dst);
262 }
263 } else
264 dev = dev_get_by_index_rcu(net, ifindex);
265
266 if (!dev)
267 return NULL;
268 idev = __in6_dev_get(dev);
269 if (!idev)
270 return NULL;
271 read_lock_bh(&idev->lock);
272 if (idev->dead) {
273 read_unlock_bh(&idev->lock);
274 return NULL;
275 }
276 return idev;
277 }
278
279 void ipv6_sock_mc_close(struct sock *sk)
280 {
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct ipv6_mc_socklist *mc_lst;
283 struct net *net = sock_net(sk);
284
285 spin_lock(&ipv6_sk_mc_lock);
286 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
287 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
288 struct net_device *dev;
289
290 np->ipv6_mc_list = mc_lst->next;
291 spin_unlock(&ipv6_sk_mc_lock);
292
293 rcu_read_lock();
294 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
295 if (dev) {
296 struct inet6_dev *idev = __in6_dev_get(dev);
297
298 (void) ip6_mc_leave_src(sk, mc_lst, idev);
299 if (idev)
300 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
301 } else
302 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
303 rcu_read_unlock();
304
305 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
306 kfree_rcu(mc_lst, rcu);
307
308 spin_lock(&ipv6_sk_mc_lock);
309 }
310 spin_unlock(&ipv6_sk_mc_lock);
311 }
312
313 int ip6_mc_source(int add, int omode, struct sock *sk,
314 struct group_source_req *pgsr)
315 {
316 struct in6_addr *source, *group;
317 struct ipv6_mc_socklist *pmc;
318 struct inet6_dev *idev;
319 struct ipv6_pinfo *inet6 = inet6_sk(sk);
320 struct ip6_sf_socklist *psl;
321 struct net *net = sock_net(sk);
322 int i, j, rv;
323 int leavegroup = 0;
324 int pmclocked = 0;
325 int err;
326
327 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
328 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
329
330 if (!ipv6_addr_is_multicast(group))
331 return -EINVAL;
332
333 rcu_read_lock();
334 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
335 if (!idev) {
336 rcu_read_unlock();
337 return -ENODEV;
338 }
339
340 err = -EADDRNOTAVAIL;
341
342 for_each_pmc_rcu(inet6, pmc) {
343 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
344 continue;
345 if (ipv6_addr_equal(&pmc->addr, group))
346 break;
347 }
348 if (!pmc) { /* must have a prior join */
349 err = -EINVAL;
350 goto done;
351 }
352 /* if a source filter was set, must be the same mode as before */
353 if (pmc->sflist) {
354 if (pmc->sfmode != omode) {
355 err = -EINVAL;
356 goto done;
357 }
358 } else if (pmc->sfmode != omode) {
359 /* allow mode switches for empty-set filters */
360 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
361 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
362 pmc->sfmode = omode;
363 }
364
365 write_lock(&pmc->sflock);
366 pmclocked = 1;
367
368 psl = pmc->sflist;
369 if (!add) {
370 if (!psl)
371 goto done; /* err = -EADDRNOTAVAIL */
372 rv = !0;
373 for (i=0; i<psl->sl_count; i++) {
374 rv = memcmp(&psl->sl_addr[i], source,
375 sizeof(struct in6_addr));
376 if (rv == 0)
377 break;
378 }
379 if (rv) /* source not found */
380 goto done; /* err = -EADDRNOTAVAIL */
381
382 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
383 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
384 leavegroup = 1;
385 goto done;
386 }
387
388 /* update the interface filter */
389 ip6_mc_del_src(idev, group, omode, 1, source, 1);
390
391 for (j=i+1; j<psl->sl_count; j++)
392 psl->sl_addr[j-1] = psl->sl_addr[j];
393 psl->sl_count--;
394 err = 0;
395 goto done;
396 }
397 /* else, add a new source to the filter */
398
399 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
400 err = -ENOBUFS;
401 goto done;
402 }
403 if (!psl || psl->sl_count == psl->sl_max) {
404 struct ip6_sf_socklist *newpsl;
405 int count = IP6_SFBLOCK;
406
407 if (psl)
408 count += psl->sl_max;
409 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
410 if (!newpsl) {
411 err = -ENOBUFS;
412 goto done;
413 }
414 newpsl->sl_max = count;
415 newpsl->sl_count = count - IP6_SFBLOCK;
416 if (psl) {
417 for (i=0; i<psl->sl_count; i++)
418 newpsl->sl_addr[i] = psl->sl_addr[i];
419 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
420 }
421 pmc->sflist = psl = newpsl;
422 }
423 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
424 for (i=0; i<psl->sl_count; i++) {
425 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
426 if (rv == 0)
427 break;
428 }
429 if (rv == 0) /* address already there is an error */
430 goto done;
431 for (j=psl->sl_count-1; j>=i; j--)
432 psl->sl_addr[j+1] = psl->sl_addr[j];
433 psl->sl_addr[i] = *source;
434 psl->sl_count++;
435 err = 0;
436 /* update the interface list */
437 ip6_mc_add_src(idev, group, omode, 1, source, 1);
438 done:
439 if (pmclocked)
440 write_unlock(&pmc->sflock);
441 read_unlock_bh(&idev->lock);
442 rcu_read_unlock();
443 if (leavegroup)
444 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
445 return err;
446 }
447
448 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
449 {
450 const struct in6_addr *group;
451 struct ipv6_mc_socklist *pmc;
452 struct inet6_dev *idev;
453 struct ipv6_pinfo *inet6 = inet6_sk(sk);
454 struct ip6_sf_socklist *newpsl, *psl;
455 struct net *net = sock_net(sk);
456 int leavegroup = 0;
457 int i, err;
458
459 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
460
461 if (!ipv6_addr_is_multicast(group))
462 return -EINVAL;
463 if (gsf->gf_fmode != MCAST_INCLUDE &&
464 gsf->gf_fmode != MCAST_EXCLUDE)
465 return -EINVAL;
466
467 rcu_read_lock();
468 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
469
470 if (!idev) {
471 rcu_read_unlock();
472 return -ENODEV;
473 }
474
475 err = 0;
476
477 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
478 leavegroup = 1;
479 goto done;
480 }
481
482 for_each_pmc_rcu(inet6, pmc) {
483 if (pmc->ifindex != gsf->gf_interface)
484 continue;
485 if (ipv6_addr_equal(&pmc->addr, group))
486 break;
487 }
488 if (!pmc) { /* must have a prior join */
489 err = -EINVAL;
490 goto done;
491 }
492 if (gsf->gf_numsrc) {
493 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
494 GFP_ATOMIC);
495 if (!newpsl) {
496 err = -ENOBUFS;
497 goto done;
498 }
499 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
500 for (i=0; i<newpsl->sl_count; ++i) {
501 struct sockaddr_in6 *psin6;
502
503 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
504 newpsl->sl_addr[i] = psin6->sin6_addr;
505 }
506 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
507 newpsl->sl_count, newpsl->sl_addr, 0);
508 if (err) {
509 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
510 goto done;
511 }
512 } else {
513 newpsl = NULL;
514 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
515 }
516
517 write_lock(&pmc->sflock);
518 psl = pmc->sflist;
519 if (psl) {
520 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
521 psl->sl_count, psl->sl_addr, 0);
522 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
523 } else
524 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
525 pmc->sflist = newpsl;
526 pmc->sfmode = gsf->gf_fmode;
527 write_unlock(&pmc->sflock);
528 err = 0;
529 done:
530 read_unlock_bh(&idev->lock);
531 rcu_read_unlock();
532 if (leavegroup)
533 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
534 return err;
535 }
536
537 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
538 struct group_filter __user *optval, int __user *optlen)
539 {
540 int err, i, count, copycount;
541 const struct in6_addr *group;
542 struct ipv6_mc_socklist *pmc;
543 struct inet6_dev *idev;
544 struct ipv6_pinfo *inet6 = inet6_sk(sk);
545 struct ip6_sf_socklist *psl;
546 struct net *net = sock_net(sk);
547
548 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
549
550 if (!ipv6_addr_is_multicast(group))
551 return -EINVAL;
552
553 rcu_read_lock();
554 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
555
556 if (!idev) {
557 rcu_read_unlock();
558 return -ENODEV;
559 }
560
561 err = -EADDRNOTAVAIL;
562 /*
563 * changes to the ipv6_mc_list require the socket lock and
564 * a read lock on ip6_sk_mc_lock. We have the socket lock,
565 * so reading the list is safe.
566 */
567
568 for_each_pmc_rcu(inet6, pmc) {
569 if (pmc->ifindex != gsf->gf_interface)
570 continue;
571 if (ipv6_addr_equal(group, &pmc->addr))
572 break;
573 }
574 if (!pmc) /* must have a prior join */
575 goto done;
576 gsf->gf_fmode = pmc->sfmode;
577 psl = pmc->sflist;
578 count = psl ? psl->sl_count : 0;
579 read_unlock_bh(&idev->lock);
580 rcu_read_unlock();
581
582 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
583 gsf->gf_numsrc = count;
584 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
585 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
586 return -EFAULT;
587 }
588 /* changes to psl require the socket lock, a read lock on
589 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
590 * have the socket lock, so reading here is safe.
591 */
592 for (i=0; i<copycount; i++) {
593 struct sockaddr_in6 *psin6;
594 struct sockaddr_storage ss;
595
596 psin6 = (struct sockaddr_in6 *)&ss;
597 memset(&ss, 0, sizeof(ss));
598 psin6->sin6_family = AF_INET6;
599 psin6->sin6_addr = psl->sl_addr[i];
600 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
601 return -EFAULT;
602 }
603 return 0;
604 done:
605 read_unlock_bh(&idev->lock);
606 rcu_read_unlock();
607 return err;
608 }
609
610 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
611 const struct in6_addr *src_addr)
612 {
613 struct ipv6_pinfo *np = inet6_sk(sk);
614 struct ipv6_mc_socklist *mc;
615 struct ip6_sf_socklist *psl;
616 int rv = 1;
617
618 rcu_read_lock();
619 for_each_pmc_rcu(np, mc) {
620 if (ipv6_addr_equal(&mc->addr, mc_addr))
621 break;
622 }
623 if (!mc) {
624 rcu_read_unlock();
625 return 1;
626 }
627 read_lock(&mc->sflock);
628 psl = mc->sflist;
629 if (!psl) {
630 rv = mc->sfmode == MCAST_EXCLUDE;
631 } else {
632 int i;
633
634 for (i=0; i<psl->sl_count; i++) {
635 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
636 break;
637 }
638 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
639 rv = 0;
640 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
641 rv = 0;
642 }
643 read_unlock(&mc->sflock);
644 rcu_read_unlock();
645
646 return rv;
647 }
648
649 static void ma_put(struct ifmcaddr6 *mc)
650 {
651 if (atomic_dec_and_test(&mc->mca_refcnt)) {
652 in6_dev_put(mc->idev);
653 kfree(mc);
654 }
655 }
656
657 static void igmp6_group_added(struct ifmcaddr6 *mc)
658 {
659 struct net_device *dev = mc->idev->dev;
660 char buf[MAX_ADDR_LEN];
661
662 spin_lock_bh(&mc->mca_lock);
663 if (!(mc->mca_flags&MAF_LOADED)) {
664 mc->mca_flags |= MAF_LOADED;
665 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
666 dev_mc_add(dev, buf);
667 }
668 spin_unlock_bh(&mc->mca_lock);
669
670 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
671 return;
672
673 if (MLD_V1_SEEN(mc->idev)) {
674 igmp6_join_group(mc);
675 return;
676 }
677 /* else v2 */
678
679 mc->mca_crcount = mc->idev->mc_qrv;
680 mld_ifc_event(mc->idev);
681 }
682
683 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
684 {
685 struct net_device *dev = mc->idev->dev;
686 char buf[MAX_ADDR_LEN];
687
688 spin_lock_bh(&mc->mca_lock);
689 if (mc->mca_flags&MAF_LOADED) {
690 mc->mca_flags &= ~MAF_LOADED;
691 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
692 dev_mc_del(dev, buf);
693 }
694
695 if (mc->mca_flags & MAF_NOREPORT)
696 goto done;
697 spin_unlock_bh(&mc->mca_lock);
698
699 if (!mc->idev->dead)
700 igmp6_leave_group(mc);
701
702 spin_lock_bh(&mc->mca_lock);
703 if (del_timer(&mc->mca_timer))
704 atomic_dec(&mc->mca_refcnt);
705 done:
706 ip6_mc_clear_src(mc);
707 spin_unlock_bh(&mc->mca_lock);
708 }
709
710 /*
711 * deleted ifmcaddr6 manipulation
712 */
713 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
714 {
715 struct ifmcaddr6 *pmc;
716
717 /* this is an "ifmcaddr6" for convenience; only the fields below
718 * are actually used. In particular, the refcnt and users are not
719 * used for management of the delete list. Using the same structure
720 * for deleted items allows change reports to use common code with
721 * non-deleted or query-response MCA's.
722 */
723 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
724 if (!pmc)
725 return;
726
727 spin_lock_bh(&im->mca_lock);
728 spin_lock_init(&pmc->mca_lock);
729 pmc->idev = im->idev;
730 in6_dev_hold(idev);
731 pmc->mca_addr = im->mca_addr;
732 pmc->mca_crcount = idev->mc_qrv;
733 pmc->mca_sfmode = im->mca_sfmode;
734 if (pmc->mca_sfmode == MCAST_INCLUDE) {
735 struct ip6_sf_list *psf;
736
737 pmc->mca_tomb = im->mca_tomb;
738 pmc->mca_sources = im->mca_sources;
739 im->mca_tomb = im->mca_sources = NULL;
740 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
741 psf->sf_crcount = pmc->mca_crcount;
742 }
743 spin_unlock_bh(&im->mca_lock);
744
745 spin_lock_bh(&idev->mc_lock);
746 pmc->next = idev->mc_tomb;
747 idev->mc_tomb = pmc;
748 spin_unlock_bh(&idev->mc_lock);
749 }
750
751 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
752 {
753 struct ifmcaddr6 *pmc, *pmc_prev;
754 struct ip6_sf_list *psf, *psf_next;
755
756 spin_lock_bh(&idev->mc_lock);
757 pmc_prev = NULL;
758 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
759 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
760 break;
761 pmc_prev = pmc;
762 }
763 if (pmc) {
764 if (pmc_prev)
765 pmc_prev->next = pmc->next;
766 else
767 idev->mc_tomb = pmc->next;
768 }
769 spin_unlock_bh(&idev->mc_lock);
770
771 if (pmc) {
772 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
773 psf_next = psf->sf_next;
774 kfree(psf);
775 }
776 in6_dev_put(pmc->idev);
777 kfree(pmc);
778 }
779 }
780
781 static void mld_clear_delrec(struct inet6_dev *idev)
782 {
783 struct ifmcaddr6 *pmc, *nextpmc;
784
785 spin_lock_bh(&idev->mc_lock);
786 pmc = idev->mc_tomb;
787 idev->mc_tomb = NULL;
788 spin_unlock_bh(&idev->mc_lock);
789
790 for (; pmc; pmc = nextpmc) {
791 nextpmc = pmc->next;
792 ip6_mc_clear_src(pmc);
793 in6_dev_put(pmc->idev);
794 kfree(pmc);
795 }
796
797 /* clear dead sources, too */
798 read_lock_bh(&idev->lock);
799 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
800 struct ip6_sf_list *psf, *psf_next;
801
802 spin_lock_bh(&pmc->mca_lock);
803 psf = pmc->mca_tomb;
804 pmc->mca_tomb = NULL;
805 spin_unlock_bh(&pmc->mca_lock);
806 for (; psf; psf=psf_next) {
807 psf_next = psf->sf_next;
808 kfree(psf);
809 }
810 }
811 read_unlock_bh(&idev->lock);
812 }
813
814
815 /*
816 * device multicast group inc (add if not found)
817 */
818 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
819 {
820 struct ifmcaddr6 *mc;
821 struct inet6_dev *idev;
822
823 /* we need to take a reference on idev */
824 idev = in6_dev_get(dev);
825
826 if (idev == NULL)
827 return -EINVAL;
828
829 write_lock_bh(&idev->lock);
830 if (idev->dead) {
831 write_unlock_bh(&idev->lock);
832 in6_dev_put(idev);
833 return -ENODEV;
834 }
835
836 for (mc = idev->mc_list; mc; mc = mc->next) {
837 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
838 mc->mca_users++;
839 write_unlock_bh(&idev->lock);
840 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
841 NULL, 0);
842 in6_dev_put(idev);
843 return 0;
844 }
845 }
846
847 /*
848 * not found: create a new one.
849 */
850
851 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
852
853 if (mc == NULL) {
854 write_unlock_bh(&idev->lock);
855 in6_dev_put(idev);
856 return -ENOMEM;
857 }
858
859 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
860
861 mc->mca_addr = *addr;
862 mc->idev = idev; /* (reference taken) */
863 mc->mca_users = 1;
864 /* mca_stamp should be updated upon changes */
865 mc->mca_cstamp = mc->mca_tstamp = jiffies;
866 atomic_set(&mc->mca_refcnt, 2);
867 spin_lock_init(&mc->mca_lock);
868
869 /* initial mode is (EX, empty) */
870 mc->mca_sfmode = MCAST_EXCLUDE;
871 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
872
873 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
874 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
875 mc->mca_flags |= MAF_NOREPORT;
876
877 mc->next = idev->mc_list;
878 idev->mc_list = mc;
879 write_unlock_bh(&idev->lock);
880
881 mld_del_delrec(idev, &mc->mca_addr);
882 igmp6_group_added(mc);
883 ma_put(mc);
884 return 0;
885 }
886
887 /*
888 * device multicast group del
889 */
890 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
891 {
892 struct ifmcaddr6 *ma, **map;
893
894 write_lock_bh(&idev->lock);
895 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
896 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
897 if (--ma->mca_users == 0) {
898 *map = ma->next;
899 write_unlock_bh(&idev->lock);
900
901 igmp6_group_dropped(ma);
902
903 ma_put(ma);
904 return 0;
905 }
906 write_unlock_bh(&idev->lock);
907 return 0;
908 }
909 }
910 write_unlock_bh(&idev->lock);
911
912 return -ENOENT;
913 }
914
915 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
916 {
917 struct inet6_dev *idev;
918 int err;
919
920 rcu_read_lock();
921
922 idev = __in6_dev_get(dev);
923 if (!idev)
924 err = -ENODEV;
925 else
926 err = __ipv6_dev_mc_dec(idev, addr);
927
928 rcu_read_unlock();
929 return err;
930 }
931
932 /*
933 * identify MLD packets for MLD filter exceptions
934 */
935 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
936 {
937 struct icmp6hdr *pic;
938
939 if (nexthdr != IPPROTO_ICMPV6)
940 return 0;
941
942 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
943 return 0;
944
945 pic = icmp6_hdr(skb);
946
947 switch (pic->icmp6_type) {
948 case ICMPV6_MGM_QUERY:
949 case ICMPV6_MGM_REPORT:
950 case ICMPV6_MGM_REDUCTION:
951 case ICMPV6_MLD2_REPORT:
952 return 1;
953 default:
954 break;
955 }
956 return 0;
957 }
958
959 /*
960 * check if the interface/address pair is valid
961 */
962 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
963 const struct in6_addr *src_addr)
964 {
965 struct inet6_dev *idev;
966 struct ifmcaddr6 *mc;
967 int rv = 0;
968
969 rcu_read_lock();
970 idev = __in6_dev_get(dev);
971 if (idev) {
972 read_lock_bh(&idev->lock);
973 for (mc = idev->mc_list; mc; mc=mc->next) {
974 if (ipv6_addr_equal(&mc->mca_addr, group))
975 break;
976 }
977 if (mc) {
978 if (src_addr && !ipv6_addr_any(src_addr)) {
979 struct ip6_sf_list *psf;
980
981 spin_lock_bh(&mc->mca_lock);
982 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
983 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
984 break;
985 }
986 if (psf)
987 rv = psf->sf_count[MCAST_INCLUDE] ||
988 psf->sf_count[MCAST_EXCLUDE] !=
989 mc->mca_sfcount[MCAST_EXCLUDE];
990 else
991 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
992 spin_unlock_bh(&mc->mca_lock);
993 } else
994 rv = 1; /* don't filter unspecified source */
995 }
996 read_unlock_bh(&idev->lock);
997 }
998 rcu_read_unlock();
999 return rv;
1000 }
1001
1002 static void mld_gq_start_timer(struct inet6_dev *idev)
1003 {
1004 int tv = net_random() % idev->mc_maxdelay;
1005
1006 idev->mc_gq_running = 1;
1007 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1008 in6_dev_hold(idev);
1009 }
1010
1011 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1012 {
1013 int tv = net_random() % delay;
1014
1015 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1016 in6_dev_hold(idev);
1017 }
1018
1019 /*
1020 * IGMP handling (alias multicast ICMPv6 messages)
1021 */
1022
1023 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1024 {
1025 unsigned long delay = resptime;
1026
1027 /* Do not start timer for these addresses */
1028 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1029 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1030 return;
1031
1032 if (del_timer(&ma->mca_timer)) {
1033 atomic_dec(&ma->mca_refcnt);
1034 delay = ma->mca_timer.expires - jiffies;
1035 }
1036
1037 if (delay >= resptime) {
1038 if (resptime)
1039 delay = net_random() % resptime;
1040 else
1041 delay = 1;
1042 }
1043 ma->mca_timer.expires = jiffies + delay;
1044 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1045 atomic_inc(&ma->mca_refcnt);
1046 ma->mca_flags |= MAF_TIMER_RUNNING;
1047 }
1048
1049 /* mark EXCLUDE-mode sources */
1050 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1051 const struct in6_addr *srcs)
1052 {
1053 struct ip6_sf_list *psf;
1054 int i, scount;
1055
1056 scount = 0;
1057 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1058 if (scount == nsrcs)
1059 break;
1060 for (i=0; i<nsrcs; i++) {
1061 /* skip inactive filters */
1062 if (psf->sf_count[MCAST_INCLUDE] ||
1063 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1064 psf->sf_count[MCAST_EXCLUDE])
1065 continue;
1066 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1067 scount++;
1068 break;
1069 }
1070 }
1071 }
1072 pmc->mca_flags &= ~MAF_GSQUERY;
1073 if (scount == nsrcs) /* all sources excluded */
1074 return 0;
1075 return 1;
1076 }
1077
1078 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1079 const struct in6_addr *srcs)
1080 {
1081 struct ip6_sf_list *psf;
1082 int i, scount;
1083
1084 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1085 return mld_xmarksources(pmc, nsrcs, srcs);
1086
1087 /* mark INCLUDE-mode sources */
1088
1089 scount = 0;
1090 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1091 if (scount == nsrcs)
1092 break;
1093 for (i=0; i<nsrcs; i++) {
1094 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1095 psf->sf_gsresp = 1;
1096 scount++;
1097 break;
1098 }
1099 }
1100 }
1101 if (!scount) {
1102 pmc->mca_flags &= ~MAF_GSQUERY;
1103 return 0;
1104 }
1105 pmc->mca_flags |= MAF_GSQUERY;
1106 return 1;
1107 }
1108
1109 /* called with rcu_read_lock() */
1110 int igmp6_event_query(struct sk_buff *skb)
1111 {
1112 struct mld2_query *mlh2 = NULL;
1113 struct ifmcaddr6 *ma;
1114 const struct in6_addr *group;
1115 unsigned long max_delay;
1116 struct inet6_dev *idev;
1117 struct mld_msg *mld;
1118 int group_type;
1119 int mark = 0;
1120 int len;
1121
1122 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1123 return -EINVAL;
1124
1125 /* compute payload length excluding extension headers */
1126 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1127 len -= skb_network_header_len(skb);
1128
1129 /* Drop queries with not link local source */
1130 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1131 return -EINVAL;
1132
1133 idev = __in6_dev_get(skb->dev);
1134
1135 if (idev == NULL)
1136 return 0;
1137
1138 mld = (struct mld_msg *)icmp6_hdr(skb);
1139 group = &mld->mld_mca;
1140 group_type = ipv6_addr_type(group);
1141
1142 if (group_type != IPV6_ADDR_ANY &&
1143 !(group_type&IPV6_ADDR_MULTICAST))
1144 return -EINVAL;
1145
1146 if (len == 24) {
1147 int switchback;
1148 /* MLDv1 router present */
1149
1150 /* Translate milliseconds to jiffies */
1151 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1152
1153 switchback = (idev->mc_qrv + 1) * max_delay;
1154 idev->mc_v1_seen = jiffies + switchback;
1155
1156 /* cancel the interface change timer */
1157 idev->mc_ifc_count = 0;
1158 if (del_timer(&idev->mc_ifc_timer))
1159 __in6_dev_put(idev);
1160 /* clear deleted report items */
1161 mld_clear_delrec(idev);
1162 } else if (len >= 28) {
1163 int srcs_offset = sizeof(struct mld2_query) -
1164 sizeof(struct icmp6hdr);
1165 if (!pskb_may_pull(skb, srcs_offset))
1166 return -EINVAL;
1167
1168 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1169 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1170 if (!max_delay)
1171 max_delay = 1;
1172 idev->mc_maxdelay = max_delay;
1173 if (mlh2->mld2q_qrv)
1174 idev->mc_qrv = mlh2->mld2q_qrv;
1175 if (group_type == IPV6_ADDR_ANY) { /* general query */
1176 if (mlh2->mld2q_nsrcs)
1177 return -EINVAL; /* no sources allowed */
1178
1179 mld_gq_start_timer(idev);
1180 return 0;
1181 }
1182 /* mark sources to include, if group & source-specific */
1183 if (mlh2->mld2q_nsrcs != 0) {
1184 if (!pskb_may_pull(skb, srcs_offset +
1185 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1186 return -EINVAL;
1187
1188 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1189 mark = 1;
1190 }
1191 } else
1192 return -EINVAL;
1193
1194 read_lock_bh(&idev->lock);
1195 if (group_type == IPV6_ADDR_ANY) {
1196 for (ma = idev->mc_list; ma; ma=ma->next) {
1197 spin_lock_bh(&ma->mca_lock);
1198 igmp6_group_queried(ma, max_delay);
1199 spin_unlock_bh(&ma->mca_lock);
1200 }
1201 } else {
1202 for (ma = idev->mc_list; ma; ma=ma->next) {
1203 if (!ipv6_addr_equal(group, &ma->mca_addr))
1204 continue;
1205 spin_lock_bh(&ma->mca_lock);
1206 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1207 /* gsquery <- gsquery && mark */
1208 if (!mark)
1209 ma->mca_flags &= ~MAF_GSQUERY;
1210 } else {
1211 /* gsquery <- mark */
1212 if (mark)
1213 ma->mca_flags |= MAF_GSQUERY;
1214 else
1215 ma->mca_flags &= ~MAF_GSQUERY;
1216 }
1217 if (!(ma->mca_flags & MAF_GSQUERY) ||
1218 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1219 igmp6_group_queried(ma, max_delay);
1220 spin_unlock_bh(&ma->mca_lock);
1221 break;
1222 }
1223 }
1224 read_unlock_bh(&idev->lock);
1225
1226 return 0;
1227 }
1228
1229 /* called with rcu_read_lock() */
1230 int igmp6_event_report(struct sk_buff *skb)
1231 {
1232 struct ifmcaddr6 *ma;
1233 struct inet6_dev *idev;
1234 struct mld_msg *mld;
1235 int addr_type;
1236
1237 /* Our own report looped back. Ignore it. */
1238 if (skb->pkt_type == PACKET_LOOPBACK)
1239 return 0;
1240
1241 /* send our report if the MC router may not have heard this report */
1242 if (skb->pkt_type != PACKET_MULTICAST &&
1243 skb->pkt_type != PACKET_BROADCAST)
1244 return 0;
1245
1246 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1247 return -EINVAL;
1248
1249 mld = (struct mld_msg *)icmp6_hdr(skb);
1250
1251 /* Drop reports with not link local source */
1252 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1253 if (addr_type != IPV6_ADDR_ANY &&
1254 !(addr_type&IPV6_ADDR_LINKLOCAL))
1255 return -EINVAL;
1256
1257 idev = __in6_dev_get(skb->dev);
1258 if (idev == NULL)
1259 return -ENODEV;
1260
1261 /*
1262 * Cancel the timer for this group
1263 */
1264
1265 read_lock_bh(&idev->lock);
1266 for (ma = idev->mc_list; ma; ma=ma->next) {
1267 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1268 spin_lock(&ma->mca_lock);
1269 if (del_timer(&ma->mca_timer))
1270 atomic_dec(&ma->mca_refcnt);
1271 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1272 spin_unlock(&ma->mca_lock);
1273 break;
1274 }
1275 }
1276 read_unlock_bh(&idev->lock);
1277 return 0;
1278 }
1279
1280 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1281 int gdeleted, int sdeleted)
1282 {
1283 switch (type) {
1284 case MLD2_MODE_IS_INCLUDE:
1285 case MLD2_MODE_IS_EXCLUDE:
1286 if (gdeleted || sdeleted)
1287 return 0;
1288 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1289 if (pmc->mca_sfmode == MCAST_INCLUDE)
1290 return 1;
1291 /* don't include if this source is excluded
1292 * in all filters
1293 */
1294 if (psf->sf_count[MCAST_INCLUDE])
1295 return type == MLD2_MODE_IS_INCLUDE;
1296 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1297 psf->sf_count[MCAST_EXCLUDE];
1298 }
1299 return 0;
1300 case MLD2_CHANGE_TO_INCLUDE:
1301 if (gdeleted || sdeleted)
1302 return 0;
1303 return psf->sf_count[MCAST_INCLUDE] != 0;
1304 case MLD2_CHANGE_TO_EXCLUDE:
1305 if (gdeleted || sdeleted)
1306 return 0;
1307 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1308 psf->sf_count[MCAST_INCLUDE])
1309 return 0;
1310 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1311 psf->sf_count[MCAST_EXCLUDE];
1312 case MLD2_ALLOW_NEW_SOURCES:
1313 if (gdeleted || !psf->sf_crcount)
1314 return 0;
1315 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1316 case MLD2_BLOCK_OLD_SOURCES:
1317 if (pmc->mca_sfmode == MCAST_INCLUDE)
1318 return gdeleted || (psf->sf_crcount && sdeleted);
1319 return psf->sf_crcount && !gdeleted && !sdeleted;
1320 }
1321 return 0;
1322 }
1323
1324 static int
1325 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1326 {
1327 struct ip6_sf_list *psf;
1328 int scount = 0;
1329
1330 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1331 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1332 continue;
1333 scount++;
1334 }
1335 return scount;
1336 }
1337
1338 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1339 {
1340 struct net *net = dev_net(dev);
1341 struct sock *sk = net->ipv6.igmp_sk;
1342 struct sk_buff *skb;
1343 struct mld2_report *pmr;
1344 struct in6_addr addr_buf;
1345 const struct in6_addr *saddr;
1346 int hlen = LL_RESERVED_SPACE(dev);
1347 int tlen = dev->needed_tailroom;
1348 int err;
1349 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1350 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1351 IPV6_TLV_PADN, 0 };
1352
1353 /* we assume size > sizeof(ra) here */
1354 size += hlen + tlen;
1355 /* limit our allocations to order-0 page */
1356 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1357 skb = sock_alloc_send_skb(sk, size, 1, &err);
1358
1359 if (!skb)
1360 return NULL;
1361
1362 skb_reserve(skb, hlen);
1363
1364 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1365 /* <draft-ietf-magma-mld-source-05.txt>:
1366 * use unspecified address as the source address
1367 * when a valid link-local address is not available.
1368 */
1369 saddr = &in6addr_any;
1370 } else
1371 saddr = &addr_buf;
1372
1373 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1374
1375 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1376
1377 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1378 skb_put(skb, sizeof(*pmr));
1379 pmr = (struct mld2_report *)skb_transport_header(skb);
1380 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1381 pmr->mld2r_resv1 = 0;
1382 pmr->mld2r_cksum = 0;
1383 pmr->mld2r_resv2 = 0;
1384 pmr->mld2r_ngrec = 0;
1385 return skb;
1386 }
1387
1388 static void mld_sendpack(struct sk_buff *skb)
1389 {
1390 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1391 struct mld2_report *pmr =
1392 (struct mld2_report *)skb_transport_header(skb);
1393 int payload_len, mldlen;
1394 struct inet6_dev *idev;
1395 struct net *net = dev_net(skb->dev);
1396 int err;
1397 struct flowi6 fl6;
1398 struct dst_entry *dst;
1399
1400 rcu_read_lock();
1401 idev = __in6_dev_get(skb->dev);
1402 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1403
1404 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1405 mldlen = skb->tail - skb->transport_header;
1406 pip6->payload_len = htons(payload_len);
1407
1408 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1409 IPPROTO_ICMPV6,
1410 csum_partial(skb_transport_header(skb),
1411 mldlen, 0));
1412
1413 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1414
1415 if (!dst) {
1416 err = -ENOMEM;
1417 goto err_out;
1418 }
1419
1420 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1421 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1422 skb->dev->ifindex);
1423
1424 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1425 err = 0;
1426 if (IS_ERR(dst)) {
1427 err = PTR_ERR(dst);
1428 dst = NULL;
1429 }
1430 skb_dst_set(skb, dst);
1431 if (err)
1432 goto err_out;
1433
1434 payload_len = skb->len;
1435
1436 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1437 dst_output);
1438 out:
1439 if (!err) {
1440 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1441 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1442 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1443 } else
1444 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1445
1446 rcu_read_unlock();
1447 return;
1448
1449 err_out:
1450 kfree_skb(skb);
1451 goto out;
1452 }
1453
1454 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1455 {
1456 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1457 }
1458
1459 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1460 int type, struct mld2_grec **ppgr)
1461 {
1462 struct net_device *dev = pmc->idev->dev;
1463 struct mld2_report *pmr;
1464 struct mld2_grec *pgr;
1465
1466 if (!skb)
1467 skb = mld_newpack(dev, dev->mtu);
1468 if (!skb)
1469 return NULL;
1470 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1471 pgr->grec_type = type;
1472 pgr->grec_auxwords = 0;
1473 pgr->grec_nsrcs = 0;
1474 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1475 pmr = (struct mld2_report *)skb_transport_header(skb);
1476 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1477 *ppgr = pgr;
1478 return skb;
1479 }
1480
1481 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1482 skb_tailroom(skb)) : 0)
1483
1484 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1485 int type, int gdeleted, int sdeleted)
1486 {
1487 struct net_device *dev = pmc->idev->dev;
1488 struct mld2_report *pmr;
1489 struct mld2_grec *pgr = NULL;
1490 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1491 int scount, stotal, first, isquery, truncate;
1492
1493 if (pmc->mca_flags & MAF_NOREPORT)
1494 return skb;
1495
1496 isquery = type == MLD2_MODE_IS_INCLUDE ||
1497 type == MLD2_MODE_IS_EXCLUDE;
1498 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1499 type == MLD2_CHANGE_TO_EXCLUDE;
1500
1501 stotal = scount = 0;
1502
1503 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1504
1505 if (!*psf_list)
1506 goto empty_source;
1507
1508 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1509
1510 /* EX and TO_EX get a fresh packet, if needed */
1511 if (truncate) {
1512 if (pmr && pmr->mld2r_ngrec &&
1513 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1514 if (skb)
1515 mld_sendpack(skb);
1516 skb = mld_newpack(dev, dev->mtu);
1517 }
1518 }
1519 first = 1;
1520 psf_prev = NULL;
1521 for (psf=*psf_list; psf; psf=psf_next) {
1522 struct in6_addr *psrc;
1523
1524 psf_next = psf->sf_next;
1525
1526 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1527 psf_prev = psf;
1528 continue;
1529 }
1530
1531 /* clear marks on query responses */
1532 if (isquery)
1533 psf->sf_gsresp = 0;
1534
1535 if (AVAILABLE(skb) < sizeof(*psrc) +
1536 first*sizeof(struct mld2_grec)) {
1537 if (truncate && !first)
1538 break; /* truncate these */
1539 if (pgr)
1540 pgr->grec_nsrcs = htons(scount);
1541 if (skb)
1542 mld_sendpack(skb);
1543 skb = mld_newpack(dev, dev->mtu);
1544 first = 1;
1545 scount = 0;
1546 }
1547 if (first) {
1548 skb = add_grhead(skb, pmc, type, &pgr);
1549 first = 0;
1550 }
1551 if (!skb)
1552 return NULL;
1553 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1554 *psrc = psf->sf_addr;
1555 scount++; stotal++;
1556 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1557 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1558 psf->sf_crcount--;
1559 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1560 if (psf_prev)
1561 psf_prev->sf_next = psf->sf_next;
1562 else
1563 *psf_list = psf->sf_next;
1564 kfree(psf);
1565 continue;
1566 }
1567 }
1568 psf_prev = psf;
1569 }
1570
1571 empty_source:
1572 if (!stotal) {
1573 if (type == MLD2_ALLOW_NEW_SOURCES ||
1574 type == MLD2_BLOCK_OLD_SOURCES)
1575 return skb;
1576 if (pmc->mca_crcount || isquery) {
1577 /* make sure we have room for group header */
1578 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1579 mld_sendpack(skb);
1580 skb = NULL; /* add_grhead will get a new one */
1581 }
1582 skb = add_grhead(skb, pmc, type, &pgr);
1583 }
1584 }
1585 if (pgr)
1586 pgr->grec_nsrcs = htons(scount);
1587
1588 if (isquery)
1589 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1590 return skb;
1591 }
1592
1593 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1594 {
1595 struct sk_buff *skb = NULL;
1596 int type;
1597
1598 if (!pmc) {
1599 read_lock_bh(&idev->lock);
1600 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1601 if (pmc->mca_flags & MAF_NOREPORT)
1602 continue;
1603 spin_lock_bh(&pmc->mca_lock);
1604 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1605 type = MLD2_MODE_IS_EXCLUDE;
1606 else
1607 type = MLD2_MODE_IS_INCLUDE;
1608 skb = add_grec(skb, pmc, type, 0, 0);
1609 spin_unlock_bh(&pmc->mca_lock);
1610 }
1611 read_unlock_bh(&idev->lock);
1612 } else {
1613 spin_lock_bh(&pmc->mca_lock);
1614 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1615 type = MLD2_MODE_IS_EXCLUDE;
1616 else
1617 type = MLD2_MODE_IS_INCLUDE;
1618 skb = add_grec(skb, pmc, type, 0, 0);
1619 spin_unlock_bh(&pmc->mca_lock);
1620 }
1621 if (skb)
1622 mld_sendpack(skb);
1623 }
1624
1625 /*
1626 * remove zero-count source records from a source filter list
1627 */
1628 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1629 {
1630 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1631
1632 psf_prev = NULL;
1633 for (psf=*ppsf; psf; psf = psf_next) {
1634 psf_next = psf->sf_next;
1635 if (psf->sf_crcount == 0) {
1636 if (psf_prev)
1637 psf_prev->sf_next = psf->sf_next;
1638 else
1639 *ppsf = psf->sf_next;
1640 kfree(psf);
1641 } else
1642 psf_prev = psf;
1643 }
1644 }
1645
1646 static void mld_send_cr(struct inet6_dev *idev)
1647 {
1648 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1649 struct sk_buff *skb = NULL;
1650 int type, dtype;
1651
1652 read_lock_bh(&idev->lock);
1653 spin_lock(&idev->mc_lock);
1654
1655 /* deleted MCA's */
1656 pmc_prev = NULL;
1657 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1658 pmc_next = pmc->next;
1659 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1660 type = MLD2_BLOCK_OLD_SOURCES;
1661 dtype = MLD2_BLOCK_OLD_SOURCES;
1662 skb = add_grec(skb, pmc, type, 1, 0);
1663 skb = add_grec(skb, pmc, dtype, 1, 1);
1664 }
1665 if (pmc->mca_crcount) {
1666 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1667 type = MLD2_CHANGE_TO_INCLUDE;
1668 skb = add_grec(skb, pmc, type, 1, 0);
1669 }
1670 pmc->mca_crcount--;
1671 if (pmc->mca_crcount == 0) {
1672 mld_clear_zeros(&pmc->mca_tomb);
1673 mld_clear_zeros(&pmc->mca_sources);
1674 }
1675 }
1676 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1677 !pmc->mca_sources) {
1678 if (pmc_prev)
1679 pmc_prev->next = pmc_next;
1680 else
1681 idev->mc_tomb = pmc_next;
1682 in6_dev_put(pmc->idev);
1683 kfree(pmc);
1684 } else
1685 pmc_prev = pmc;
1686 }
1687 spin_unlock(&idev->mc_lock);
1688
1689 /* change recs */
1690 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1691 spin_lock_bh(&pmc->mca_lock);
1692 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1693 type = MLD2_BLOCK_OLD_SOURCES;
1694 dtype = MLD2_ALLOW_NEW_SOURCES;
1695 } else {
1696 type = MLD2_ALLOW_NEW_SOURCES;
1697 dtype = MLD2_BLOCK_OLD_SOURCES;
1698 }
1699 skb = add_grec(skb, pmc, type, 0, 0);
1700 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1701
1702 /* filter mode changes */
1703 if (pmc->mca_crcount) {
1704 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1705 type = MLD2_CHANGE_TO_EXCLUDE;
1706 else
1707 type = MLD2_CHANGE_TO_INCLUDE;
1708 skb = add_grec(skb, pmc, type, 0, 0);
1709 pmc->mca_crcount--;
1710 }
1711 spin_unlock_bh(&pmc->mca_lock);
1712 }
1713 read_unlock_bh(&idev->lock);
1714 if (!skb)
1715 return;
1716 (void) mld_sendpack(skb);
1717 }
1718
1719 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1720 {
1721 struct net *net = dev_net(dev);
1722 struct sock *sk = net->ipv6.igmp_sk;
1723 struct inet6_dev *idev;
1724 struct sk_buff *skb;
1725 struct mld_msg *hdr;
1726 const struct in6_addr *snd_addr, *saddr;
1727 struct in6_addr addr_buf;
1728 int hlen = LL_RESERVED_SPACE(dev);
1729 int tlen = dev->needed_tailroom;
1730 int err, len, payload_len, full_len;
1731 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1732 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1733 IPV6_TLV_PADN, 0 };
1734 struct flowi6 fl6;
1735 struct dst_entry *dst;
1736
1737 if (type == ICMPV6_MGM_REDUCTION)
1738 snd_addr = &in6addr_linklocal_allrouters;
1739 else
1740 snd_addr = addr;
1741
1742 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1743 payload_len = len + sizeof(ra);
1744 full_len = sizeof(struct ipv6hdr) + payload_len;
1745
1746 rcu_read_lock();
1747 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1748 IPSTATS_MIB_OUT, full_len);
1749 rcu_read_unlock();
1750
1751 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1752
1753 if (skb == NULL) {
1754 rcu_read_lock();
1755 IP6_INC_STATS(net, __in6_dev_get(dev),
1756 IPSTATS_MIB_OUTDISCARDS);
1757 rcu_read_unlock();
1758 return;
1759 }
1760
1761 skb_reserve(skb, hlen);
1762
1763 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1764 /* <draft-ietf-magma-mld-source-05.txt>:
1765 * use unspecified address as the source address
1766 * when a valid link-local address is not available.
1767 */
1768 saddr = &in6addr_any;
1769 } else
1770 saddr = &addr_buf;
1771
1772 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1773
1774 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1775
1776 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1777 memset(hdr, 0, sizeof(struct mld_msg));
1778 hdr->mld_type = type;
1779 hdr->mld_mca = *addr;
1780
1781 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1782 IPPROTO_ICMPV6,
1783 csum_partial(hdr, len, 0));
1784
1785 rcu_read_lock();
1786 idev = __in6_dev_get(skb->dev);
1787
1788 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1789 if (!dst) {
1790 err = -ENOMEM;
1791 goto err_out;
1792 }
1793
1794 icmpv6_flow_init(sk, &fl6, type,
1795 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1796 skb->dev->ifindex);
1797
1798 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1799 if (IS_ERR(dst)) {
1800 err = PTR_ERR(dst);
1801 goto err_out;
1802 }
1803
1804 skb_dst_set(skb, dst);
1805 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1806 dst_output);
1807 out:
1808 if (!err) {
1809 ICMP6MSGOUT_INC_STATS(net, idev, type);
1810 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1811 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1812 } else
1813 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1814
1815 rcu_read_unlock();
1816 return;
1817
1818 err_out:
1819 kfree_skb(skb);
1820 goto out;
1821 }
1822
1823 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1824 const struct in6_addr *psfsrc)
1825 {
1826 struct ip6_sf_list *psf, *psf_prev;
1827 int rv = 0;
1828
1829 psf_prev = NULL;
1830 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1831 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1832 break;
1833 psf_prev = psf;
1834 }
1835 if (!psf || psf->sf_count[sfmode] == 0) {
1836 /* source filter not found, or count wrong => bug */
1837 return -ESRCH;
1838 }
1839 psf->sf_count[sfmode]--;
1840 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1841 struct inet6_dev *idev = pmc->idev;
1842
1843 /* no more filters for this source */
1844 if (psf_prev)
1845 psf_prev->sf_next = psf->sf_next;
1846 else
1847 pmc->mca_sources = psf->sf_next;
1848 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1849 !MLD_V1_SEEN(idev)) {
1850 psf->sf_crcount = idev->mc_qrv;
1851 psf->sf_next = pmc->mca_tomb;
1852 pmc->mca_tomb = psf;
1853 rv = 1;
1854 } else
1855 kfree(psf);
1856 }
1857 return rv;
1858 }
1859
1860 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1861 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1862 int delta)
1863 {
1864 struct ifmcaddr6 *pmc;
1865 int changerec = 0;
1866 int i, err;
1867
1868 if (!idev)
1869 return -ENODEV;
1870 read_lock_bh(&idev->lock);
1871 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1872 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1873 break;
1874 }
1875 if (!pmc) {
1876 /* MCA not found?? bug */
1877 read_unlock_bh(&idev->lock);
1878 return -ESRCH;
1879 }
1880 spin_lock_bh(&pmc->mca_lock);
1881 sf_markstate(pmc);
1882 if (!delta) {
1883 if (!pmc->mca_sfcount[sfmode]) {
1884 spin_unlock_bh(&pmc->mca_lock);
1885 read_unlock_bh(&idev->lock);
1886 return -EINVAL;
1887 }
1888 pmc->mca_sfcount[sfmode]--;
1889 }
1890 err = 0;
1891 for (i=0; i<sfcount; i++) {
1892 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1893
1894 changerec |= rv > 0;
1895 if (!err && rv < 0)
1896 err = rv;
1897 }
1898 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1899 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1900 pmc->mca_sfcount[MCAST_INCLUDE]) {
1901 struct ip6_sf_list *psf;
1902
1903 /* filter mode change */
1904 pmc->mca_sfmode = MCAST_INCLUDE;
1905 pmc->mca_crcount = idev->mc_qrv;
1906 idev->mc_ifc_count = pmc->mca_crcount;
1907 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1908 psf->sf_crcount = 0;
1909 mld_ifc_event(pmc->idev);
1910 } else if (sf_setstate(pmc) || changerec)
1911 mld_ifc_event(pmc->idev);
1912 spin_unlock_bh(&pmc->mca_lock);
1913 read_unlock_bh(&idev->lock);
1914 return err;
1915 }
1916
1917 /*
1918 * Add multicast single-source filter to the interface list
1919 */
1920 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1921 const struct in6_addr *psfsrc, int delta)
1922 {
1923 struct ip6_sf_list *psf, *psf_prev;
1924
1925 psf_prev = NULL;
1926 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1927 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1928 break;
1929 psf_prev = psf;
1930 }
1931 if (!psf) {
1932 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1933 if (!psf)
1934 return -ENOBUFS;
1935
1936 psf->sf_addr = *psfsrc;
1937 if (psf_prev) {
1938 psf_prev->sf_next = psf;
1939 } else
1940 pmc->mca_sources = psf;
1941 }
1942 psf->sf_count[sfmode]++;
1943 return 0;
1944 }
1945
1946 static void sf_markstate(struct ifmcaddr6 *pmc)
1947 {
1948 struct ip6_sf_list *psf;
1949 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1950
1951 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1952 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1953 psf->sf_oldin = mca_xcount ==
1954 psf->sf_count[MCAST_EXCLUDE] &&
1955 !psf->sf_count[MCAST_INCLUDE];
1956 } else
1957 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1958 }
1959
1960 static int sf_setstate(struct ifmcaddr6 *pmc)
1961 {
1962 struct ip6_sf_list *psf, *dpsf;
1963 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1964 int qrv = pmc->idev->mc_qrv;
1965 int new_in, rv;
1966
1967 rv = 0;
1968 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1969 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1970 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1971 !psf->sf_count[MCAST_INCLUDE];
1972 } else
1973 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1974 if (new_in) {
1975 if (!psf->sf_oldin) {
1976 struct ip6_sf_list *prev = NULL;
1977
1978 for (dpsf=pmc->mca_tomb; dpsf;
1979 dpsf=dpsf->sf_next) {
1980 if (ipv6_addr_equal(&dpsf->sf_addr,
1981 &psf->sf_addr))
1982 break;
1983 prev = dpsf;
1984 }
1985 if (dpsf) {
1986 if (prev)
1987 prev->sf_next = dpsf->sf_next;
1988 else
1989 pmc->mca_tomb = dpsf->sf_next;
1990 kfree(dpsf);
1991 }
1992 psf->sf_crcount = qrv;
1993 rv++;
1994 }
1995 } else if (psf->sf_oldin) {
1996 psf->sf_crcount = 0;
1997 /*
1998 * add or update "delete" records if an active filter
1999 * is now inactive
2000 */
2001 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2002 if (ipv6_addr_equal(&dpsf->sf_addr,
2003 &psf->sf_addr))
2004 break;
2005 if (!dpsf) {
2006 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2007 if (!dpsf)
2008 continue;
2009 *dpsf = *psf;
2010 /* pmc->mca_lock held by callers */
2011 dpsf->sf_next = pmc->mca_tomb;
2012 pmc->mca_tomb = dpsf;
2013 }
2014 dpsf->sf_crcount = qrv;
2015 rv++;
2016 }
2017 }
2018 return rv;
2019 }
2020
2021 /*
2022 * Add multicast source filter list to the interface list
2023 */
2024 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2025 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2026 int delta)
2027 {
2028 struct ifmcaddr6 *pmc;
2029 int isexclude;
2030 int i, err;
2031
2032 if (!idev)
2033 return -ENODEV;
2034 read_lock_bh(&idev->lock);
2035 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2036 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2037 break;
2038 }
2039 if (!pmc) {
2040 /* MCA not found?? bug */
2041 read_unlock_bh(&idev->lock);
2042 return -ESRCH;
2043 }
2044 spin_lock_bh(&pmc->mca_lock);
2045
2046 sf_markstate(pmc);
2047 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2048 if (!delta)
2049 pmc->mca_sfcount[sfmode]++;
2050 err = 0;
2051 for (i=0; i<sfcount; i++) {
2052 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2053 if (err)
2054 break;
2055 }
2056 if (err) {
2057 int j;
2058
2059 if (!delta)
2060 pmc->mca_sfcount[sfmode]--;
2061 for (j=0; j<i; j++)
2062 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2063 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2064 struct ip6_sf_list *psf;
2065
2066 /* filter mode change */
2067 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2068 pmc->mca_sfmode = MCAST_EXCLUDE;
2069 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2070 pmc->mca_sfmode = MCAST_INCLUDE;
2071 /* else no filters; keep old mode for reports */
2072
2073 pmc->mca_crcount = idev->mc_qrv;
2074 idev->mc_ifc_count = pmc->mca_crcount;
2075 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2076 psf->sf_crcount = 0;
2077 mld_ifc_event(idev);
2078 } else if (sf_setstate(pmc))
2079 mld_ifc_event(idev);
2080 spin_unlock_bh(&pmc->mca_lock);
2081 read_unlock_bh(&idev->lock);
2082 return err;
2083 }
2084
2085 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2086 {
2087 struct ip6_sf_list *psf, *nextpsf;
2088
2089 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2090 nextpsf = psf->sf_next;
2091 kfree(psf);
2092 }
2093 pmc->mca_tomb = NULL;
2094 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2095 nextpsf = psf->sf_next;
2096 kfree(psf);
2097 }
2098 pmc->mca_sources = NULL;
2099 pmc->mca_sfmode = MCAST_EXCLUDE;
2100 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2101 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2102 }
2103
2104
2105 static void igmp6_join_group(struct ifmcaddr6 *ma)
2106 {
2107 unsigned long delay;
2108
2109 if (ma->mca_flags & MAF_NOREPORT)
2110 return;
2111
2112 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2113
2114 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2115
2116 spin_lock_bh(&ma->mca_lock);
2117 if (del_timer(&ma->mca_timer)) {
2118 atomic_dec(&ma->mca_refcnt);
2119 delay = ma->mca_timer.expires - jiffies;
2120 }
2121
2122 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2123 atomic_inc(&ma->mca_refcnt);
2124 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2125 spin_unlock_bh(&ma->mca_lock);
2126 }
2127
2128 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2129 struct inet6_dev *idev)
2130 {
2131 int err;
2132
2133 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2134 * so no other readers or writers of iml or its sflist
2135 */
2136 if (!iml->sflist) {
2137 /* any-source empty exclude case */
2138 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2139 }
2140 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2141 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2142 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2143 iml->sflist = NULL;
2144 return err;
2145 }
2146
2147 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2148 {
2149 if (MLD_V1_SEEN(ma->idev)) {
2150 if (ma->mca_flags & MAF_LAST_REPORTER)
2151 igmp6_send(&ma->mca_addr, ma->idev->dev,
2152 ICMPV6_MGM_REDUCTION);
2153 } else {
2154 mld_add_delrec(ma->idev, ma);
2155 mld_ifc_event(ma->idev);
2156 }
2157 }
2158
2159 static void mld_gq_timer_expire(unsigned long data)
2160 {
2161 struct inet6_dev *idev = (struct inet6_dev *)data;
2162
2163 idev->mc_gq_running = 0;
2164 mld_send_report(idev, NULL);
2165 __in6_dev_put(idev);
2166 }
2167
2168 static void mld_ifc_timer_expire(unsigned long data)
2169 {
2170 struct inet6_dev *idev = (struct inet6_dev *)data;
2171
2172 mld_send_cr(idev);
2173 if (idev->mc_ifc_count) {
2174 idev->mc_ifc_count--;
2175 if (idev->mc_ifc_count)
2176 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2177 }
2178 __in6_dev_put(idev);
2179 }
2180
2181 static void mld_ifc_event(struct inet6_dev *idev)
2182 {
2183 if (MLD_V1_SEEN(idev))
2184 return;
2185 idev->mc_ifc_count = idev->mc_qrv;
2186 mld_ifc_start_timer(idev, 1);
2187 }
2188
2189
2190 static void igmp6_timer_handler(unsigned long data)
2191 {
2192 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2193
2194 if (MLD_V1_SEEN(ma->idev))
2195 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2196 else
2197 mld_send_report(ma->idev, ma);
2198
2199 spin_lock(&ma->mca_lock);
2200 ma->mca_flags |= MAF_LAST_REPORTER;
2201 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2202 spin_unlock(&ma->mca_lock);
2203 ma_put(ma);
2204 }
2205
2206 /* Device changing type */
2207
2208 void ipv6_mc_unmap(struct inet6_dev *idev)
2209 {
2210 struct ifmcaddr6 *i;
2211
2212 /* Install multicast list, except for all-nodes (already installed) */
2213
2214 read_lock_bh(&idev->lock);
2215 for (i = idev->mc_list; i; i = i->next)
2216 igmp6_group_dropped(i);
2217 read_unlock_bh(&idev->lock);
2218 }
2219
2220 void ipv6_mc_remap(struct inet6_dev *idev)
2221 {
2222 ipv6_mc_up(idev);
2223 }
2224
2225 /* Device going down */
2226
2227 void ipv6_mc_down(struct inet6_dev *idev)
2228 {
2229 struct ifmcaddr6 *i;
2230
2231 /* Withdraw multicast list */
2232
2233 read_lock_bh(&idev->lock);
2234 idev->mc_ifc_count = 0;
2235 if (del_timer(&idev->mc_ifc_timer))
2236 __in6_dev_put(idev);
2237 idev->mc_gq_running = 0;
2238 if (del_timer(&idev->mc_gq_timer))
2239 __in6_dev_put(idev);
2240
2241 for (i = idev->mc_list; i; i=i->next)
2242 igmp6_group_dropped(i);
2243 read_unlock_bh(&idev->lock);
2244
2245 mld_clear_delrec(idev);
2246 }
2247
2248
2249 /* Device going up */
2250
2251 void ipv6_mc_up(struct inet6_dev *idev)
2252 {
2253 struct ifmcaddr6 *i;
2254
2255 /* Install multicast list, except for all-nodes (already installed) */
2256
2257 read_lock_bh(&idev->lock);
2258 for (i = idev->mc_list; i; i=i->next)
2259 igmp6_group_added(i);
2260 read_unlock_bh(&idev->lock);
2261 }
2262
2263 /* IPv6 device initialization. */
2264
2265 void ipv6_mc_init_dev(struct inet6_dev *idev)
2266 {
2267 write_lock_bh(&idev->lock);
2268 spin_lock_init(&idev->mc_lock);
2269 idev->mc_gq_running = 0;
2270 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2271 (unsigned long)idev);
2272 idev->mc_tomb = NULL;
2273 idev->mc_ifc_count = 0;
2274 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2275 (unsigned long)idev);
2276 idev->mc_qrv = MLD_QRV_DEFAULT;
2277 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2278 idev->mc_v1_seen = 0;
2279 write_unlock_bh(&idev->lock);
2280 }
2281
2282 /*
2283 * Device is about to be destroyed: clean up.
2284 */
2285
2286 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2287 {
2288 struct ifmcaddr6 *i;
2289
2290 /* Deactivate timers */
2291 ipv6_mc_down(idev);
2292
2293 /* Delete all-nodes address. */
2294 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2295 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2296 * fail.
2297 */
2298 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2299
2300 if (idev->cnf.forwarding)
2301 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2302
2303 write_lock_bh(&idev->lock);
2304 while ((i = idev->mc_list) != NULL) {
2305 idev->mc_list = i->next;
2306 write_unlock_bh(&idev->lock);
2307
2308 igmp6_group_dropped(i);
2309 ma_put(i);
2310
2311 write_lock_bh(&idev->lock);
2312 }
2313 write_unlock_bh(&idev->lock);
2314 }
2315
2316 #ifdef CONFIG_PROC_FS
2317 struct igmp6_mc_iter_state {
2318 struct seq_net_private p;
2319 struct net_device *dev;
2320 struct inet6_dev *idev;
2321 };
2322
2323 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2324
2325 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2326 {
2327 struct ifmcaddr6 *im = NULL;
2328 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2329 struct net *net = seq_file_net(seq);
2330
2331 state->idev = NULL;
2332 for_each_netdev_rcu(net, state->dev) {
2333 struct inet6_dev *idev;
2334 idev = __in6_dev_get(state->dev);
2335 if (!idev)
2336 continue;
2337 read_lock_bh(&idev->lock);
2338 im = idev->mc_list;
2339 if (im) {
2340 state->idev = idev;
2341 break;
2342 }
2343 read_unlock_bh(&idev->lock);
2344 }
2345 return im;
2346 }
2347
2348 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2349 {
2350 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2351
2352 im = im->next;
2353 while (!im) {
2354 if (likely(state->idev != NULL))
2355 read_unlock_bh(&state->idev->lock);
2356
2357 state->dev = next_net_device_rcu(state->dev);
2358 if (!state->dev) {
2359 state->idev = NULL;
2360 break;
2361 }
2362 state->idev = __in6_dev_get(state->dev);
2363 if (!state->idev)
2364 continue;
2365 read_lock_bh(&state->idev->lock);
2366 im = state->idev->mc_list;
2367 }
2368 return im;
2369 }
2370
2371 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2372 {
2373 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2374 if (im)
2375 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2376 --pos;
2377 return pos ? NULL : im;
2378 }
2379
2380 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2381 __acquires(RCU)
2382 {
2383 rcu_read_lock();
2384 return igmp6_mc_get_idx(seq, *pos);
2385 }
2386
2387 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2388 {
2389 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2390
2391 ++*pos;
2392 return im;
2393 }
2394
2395 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2396 __releases(RCU)
2397 {
2398 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2399
2400 if (likely(state->idev != NULL)) {
2401 read_unlock_bh(&state->idev->lock);
2402 state->idev = NULL;
2403 }
2404 state->dev = NULL;
2405 rcu_read_unlock();
2406 }
2407
2408 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2409 {
2410 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2411 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2412
2413 seq_printf(seq,
2414 "%-4d %-15s %pi6 %5d %08X %ld\n",
2415 state->dev->ifindex, state->dev->name,
2416 &im->mca_addr,
2417 im->mca_users, im->mca_flags,
2418 (im->mca_flags&MAF_TIMER_RUNNING) ?
2419 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2420 return 0;
2421 }
2422
2423 static const struct seq_operations igmp6_mc_seq_ops = {
2424 .start = igmp6_mc_seq_start,
2425 .next = igmp6_mc_seq_next,
2426 .stop = igmp6_mc_seq_stop,
2427 .show = igmp6_mc_seq_show,
2428 };
2429
2430 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2431 {
2432 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2433 sizeof(struct igmp6_mc_iter_state));
2434 }
2435
2436 static const struct file_operations igmp6_mc_seq_fops = {
2437 .owner = THIS_MODULE,
2438 .open = igmp6_mc_seq_open,
2439 .read = seq_read,
2440 .llseek = seq_lseek,
2441 .release = seq_release_net,
2442 };
2443
2444 struct igmp6_mcf_iter_state {
2445 struct seq_net_private p;
2446 struct net_device *dev;
2447 struct inet6_dev *idev;
2448 struct ifmcaddr6 *im;
2449 };
2450
2451 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2452
2453 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2454 {
2455 struct ip6_sf_list *psf = NULL;
2456 struct ifmcaddr6 *im = NULL;
2457 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2458 struct net *net = seq_file_net(seq);
2459
2460 state->idev = NULL;
2461 state->im = NULL;
2462 for_each_netdev_rcu(net, state->dev) {
2463 struct inet6_dev *idev;
2464 idev = __in6_dev_get(state->dev);
2465 if (unlikely(idev == NULL))
2466 continue;
2467 read_lock_bh(&idev->lock);
2468 im = idev->mc_list;
2469 if (likely(im != NULL)) {
2470 spin_lock_bh(&im->mca_lock);
2471 psf = im->mca_sources;
2472 if (likely(psf != NULL)) {
2473 state->im = im;
2474 state->idev = idev;
2475 break;
2476 }
2477 spin_unlock_bh(&im->mca_lock);
2478 }
2479 read_unlock_bh(&idev->lock);
2480 }
2481 return psf;
2482 }
2483
2484 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2485 {
2486 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2487
2488 psf = psf->sf_next;
2489 while (!psf) {
2490 spin_unlock_bh(&state->im->mca_lock);
2491 state->im = state->im->next;
2492 while (!state->im) {
2493 if (likely(state->idev != NULL))
2494 read_unlock_bh(&state->idev->lock);
2495
2496 state->dev = next_net_device_rcu(state->dev);
2497 if (!state->dev) {
2498 state->idev = NULL;
2499 goto out;
2500 }
2501 state->idev = __in6_dev_get(state->dev);
2502 if (!state->idev)
2503 continue;
2504 read_lock_bh(&state->idev->lock);
2505 state->im = state->idev->mc_list;
2506 }
2507 if (!state->im)
2508 break;
2509 spin_lock_bh(&state->im->mca_lock);
2510 psf = state->im->mca_sources;
2511 }
2512 out:
2513 return psf;
2514 }
2515
2516 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2517 {
2518 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2519 if (psf)
2520 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2521 --pos;
2522 return pos ? NULL : psf;
2523 }
2524
2525 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2526 __acquires(RCU)
2527 {
2528 rcu_read_lock();
2529 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2530 }
2531
2532 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2533 {
2534 struct ip6_sf_list *psf;
2535 if (v == SEQ_START_TOKEN)
2536 psf = igmp6_mcf_get_first(seq);
2537 else
2538 psf = igmp6_mcf_get_next(seq, v);
2539 ++*pos;
2540 return psf;
2541 }
2542
2543 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2544 __releases(RCU)
2545 {
2546 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2547 if (likely(state->im != NULL)) {
2548 spin_unlock_bh(&state->im->mca_lock);
2549 state->im = NULL;
2550 }
2551 if (likely(state->idev != NULL)) {
2552 read_unlock_bh(&state->idev->lock);
2553 state->idev = NULL;
2554 }
2555 state->dev = NULL;
2556 rcu_read_unlock();
2557 }
2558
2559 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2560 {
2561 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2562 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2563
2564 if (v == SEQ_START_TOKEN) {
2565 seq_printf(seq,
2566 "%3s %6s "
2567 "%32s %32s %6s %6s\n", "Idx",
2568 "Device", "Multicast Address",
2569 "Source Address", "INC", "EXC");
2570 } else {
2571 seq_printf(seq,
2572 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2573 state->dev->ifindex, state->dev->name,
2574 &state->im->mca_addr,
2575 &psf->sf_addr,
2576 psf->sf_count[MCAST_INCLUDE],
2577 psf->sf_count[MCAST_EXCLUDE]);
2578 }
2579 return 0;
2580 }
2581
2582 static const struct seq_operations igmp6_mcf_seq_ops = {
2583 .start = igmp6_mcf_seq_start,
2584 .next = igmp6_mcf_seq_next,
2585 .stop = igmp6_mcf_seq_stop,
2586 .show = igmp6_mcf_seq_show,
2587 };
2588
2589 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2590 {
2591 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2592 sizeof(struct igmp6_mcf_iter_state));
2593 }
2594
2595 static const struct file_operations igmp6_mcf_seq_fops = {
2596 .owner = THIS_MODULE,
2597 .open = igmp6_mcf_seq_open,
2598 .read = seq_read,
2599 .llseek = seq_lseek,
2600 .release = seq_release_net,
2601 };
2602
2603 static int __net_init igmp6_proc_init(struct net *net)
2604 {
2605 int err;
2606
2607 err = -ENOMEM;
2608 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2609 goto out;
2610 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2611 &igmp6_mcf_seq_fops))
2612 goto out_proc_net_igmp6;
2613
2614 err = 0;
2615 out:
2616 return err;
2617
2618 out_proc_net_igmp6:
2619 proc_net_remove(net, "igmp6");
2620 goto out;
2621 }
2622
2623 static void __net_exit igmp6_proc_exit(struct net *net)
2624 {
2625 proc_net_remove(net, "mcfilter6");
2626 proc_net_remove(net, "igmp6");
2627 }
2628 #else
2629 static inline int igmp6_proc_init(struct net *net)
2630 {
2631 return 0;
2632 }
2633 static inline void igmp6_proc_exit(struct net *net)
2634 {
2635 }
2636 #endif
2637
2638 static int __net_init igmp6_net_init(struct net *net)
2639 {
2640 int err;
2641
2642 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2643 SOCK_RAW, IPPROTO_ICMPV6, net);
2644 if (err < 0) {
2645 printk(KERN_ERR
2646 "Failed to initialize the IGMP6 control socket (err %d).\n",
2647 err);
2648 goto out;
2649 }
2650
2651 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2652
2653 err = igmp6_proc_init(net);
2654 if (err)
2655 goto out_sock_create;
2656 out:
2657 return err;
2658
2659 out_sock_create:
2660 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2661 goto out;
2662 }
2663
2664 static void __net_exit igmp6_net_exit(struct net *net)
2665 {
2666 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2667 igmp6_proc_exit(net);
2668 }
2669
2670 static struct pernet_operations igmp6_net_ops = {
2671 .init = igmp6_net_init,
2672 .exit = igmp6_net_exit,
2673 };
2674
2675 int __init igmp6_init(void)
2676 {
2677 return register_pernet_subsys(&igmp6_net_ops);
2678 }
2679
2680 void igmp6_cleanup(void)
2681 {
2682 unregister_pernet_subsys(&igmp6_net_ops);
2683 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree