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powerpc: remove unused variable
[linux-2.6/next.git] / net / ipv6 / mcast.c
blobd1444b95ad7e527c8c0f3e00b906567d5043ba21
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_RWLOCK(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 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
127 {
128 struct net_device *dev = NULL;
129 struct ipv6_mc_socklist *mc_lst;
130 struct ipv6_pinfo *np = inet6_sk(sk);
131 struct net *net = sock_net(sk);
132 int err;
133
134 if (!ipv6_addr_is_multicast(addr))
135 return -EINVAL;
136
137 read_lock_bh(&ipv6_sk_mc_lock);
138 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
139 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
140 ipv6_addr_equal(&mc_lst->addr, addr)) {
141 read_unlock_bh(&ipv6_sk_mc_lock);
142 return -EADDRINUSE;
143 }
144 }
145 read_unlock_bh(&ipv6_sk_mc_lock);
146
147 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
148
149 if (mc_lst == NULL)
150 return -ENOMEM;
151
152 mc_lst->next = NULL;
153 ipv6_addr_copy(&mc_lst->addr, addr);
154
155 rcu_read_lock();
156 if (ifindex == 0) {
157 struct rt6_info *rt;
158 rt = rt6_lookup(net, addr, NULL, 0, 0);
159 if (rt) {
160 dev = rt->rt6i_dev;
161 dst_release(&rt->dst);
162 }
163 } else
164 dev = dev_get_by_index_rcu(net, ifindex);
165
166 if (dev == NULL) {
167 rcu_read_unlock();
168 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
169 return -ENODEV;
170 }
171
172 mc_lst->ifindex = dev->ifindex;
173 mc_lst->sfmode = MCAST_EXCLUDE;
174 rwlock_init(&mc_lst->sflock);
175 mc_lst->sflist = NULL;
176
177 /*
178 * now add/increase the group membership on the device
179 */
180
181 err = ipv6_dev_mc_inc(dev, addr);
182
183 if (err) {
184 rcu_read_unlock();
185 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
186 return err;
187 }
188
189 write_lock_bh(&ipv6_sk_mc_lock);
190 mc_lst->next = np->ipv6_mc_list;
191 np->ipv6_mc_list = mc_lst;
192 write_unlock_bh(&ipv6_sk_mc_lock);
193
194 rcu_read_unlock();
195
196 return 0;
197 }
198
199 /*
200 * socket leave on multicast group
201 */
202 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
203 {
204 struct ipv6_pinfo *np = inet6_sk(sk);
205 struct ipv6_mc_socklist *mc_lst, **lnk;
206 struct net *net = sock_net(sk);
207
208 write_lock_bh(&ipv6_sk_mc_lock);
209 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
210 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
211 ipv6_addr_equal(&mc_lst->addr, addr)) {
212 struct net_device *dev;
213
214 *lnk = mc_lst->next;
215 write_unlock_bh(&ipv6_sk_mc_lock);
216
217 rcu_read_lock();
218 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
219 if (dev != NULL) {
220 struct inet6_dev *idev = __in6_dev_get(dev);
221
222 (void) ip6_mc_leave_src(sk, mc_lst, idev);
223 if (idev)
224 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
225 } else
226 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
227 rcu_read_unlock();
228 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
229 return 0;
230 }
231 }
232 write_unlock_bh(&ipv6_sk_mc_lock);
233
234 return -EADDRNOTAVAIL;
235 }
236
237 /* called with rcu_read_lock() */
238 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
239 struct in6_addr *group,
240 int ifindex)
241 {
242 struct net_device *dev = NULL;
243 struct inet6_dev *idev = NULL;
244
245 if (ifindex == 0) {
246 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
247
248 if (rt) {
249 dev = rt->rt6i_dev;
250 dev_hold(dev);
251 dst_release(&rt->dst);
252 }
253 } else
254 dev = dev_get_by_index_rcu(net, ifindex);
255
256 if (!dev)
257 return NULL;
258 idev = __in6_dev_get(dev);
259 if (!idev)
260 return NULL;;
261 read_lock_bh(&idev->lock);
262 if (idev->dead) {
263 read_unlock_bh(&idev->lock);
264 return NULL;
265 }
266 return idev;
267 }
268
269 void ipv6_sock_mc_close(struct sock *sk)
270 {
271 struct ipv6_pinfo *np = inet6_sk(sk);
272 struct ipv6_mc_socklist *mc_lst;
273 struct net *net = sock_net(sk);
274
275 write_lock_bh(&ipv6_sk_mc_lock);
276 while ((mc_lst = np->ipv6_mc_list) != NULL) {
277 struct net_device *dev;
278
279 np->ipv6_mc_list = mc_lst->next;
280 write_unlock_bh(&ipv6_sk_mc_lock);
281
282 rcu_read_lock();
283 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
284 if (dev) {
285 struct inet6_dev *idev = __in6_dev_get(dev);
286
287 (void) ip6_mc_leave_src(sk, mc_lst, idev);
288 if (idev)
289 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
290 } else
291 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
292 rcu_read_unlock();
293 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
294
295 write_lock_bh(&ipv6_sk_mc_lock);
296 }
297 write_unlock_bh(&ipv6_sk_mc_lock);
298 }
299
300 int ip6_mc_source(int add, int omode, struct sock *sk,
301 struct group_source_req *pgsr)
302 {
303 struct in6_addr *source, *group;
304 struct ipv6_mc_socklist *pmc;
305 struct net_device *dev;
306 struct inet6_dev *idev;
307 struct ipv6_pinfo *inet6 = inet6_sk(sk);
308 struct ip6_sf_socklist *psl;
309 struct net *net = sock_net(sk);
310 int i, j, rv;
311 int leavegroup = 0;
312 int pmclocked = 0;
313 int err;
314
315 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
316 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
317
318 if (!ipv6_addr_is_multicast(group))
319 return -EINVAL;
320
321 rcu_read_lock();
322 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
323 if (!idev) {
324 rcu_read_unlock();
325 return -ENODEV;
326 }
327 dev = idev->dev;
328
329 err = -EADDRNOTAVAIL;
330
331 read_lock(&ipv6_sk_mc_lock);
332 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
333 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
334 continue;
335 if (ipv6_addr_equal(&pmc->addr, group))
336 break;
337 }
338 if (!pmc) { /* must have a prior join */
339 err = -EINVAL;
340 goto done;
341 }
342 /* if a source filter was set, must be the same mode as before */
343 if (pmc->sflist) {
344 if (pmc->sfmode != omode) {
345 err = -EINVAL;
346 goto done;
347 }
348 } else if (pmc->sfmode != omode) {
349 /* allow mode switches for empty-set filters */
350 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
351 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
352 pmc->sfmode = omode;
353 }
354
355 write_lock(&pmc->sflock);
356 pmclocked = 1;
357
358 psl = pmc->sflist;
359 if (!add) {
360 if (!psl)
361 goto done; /* err = -EADDRNOTAVAIL */
362 rv = !0;
363 for (i=0; i<psl->sl_count; i++) {
364 rv = memcmp(&psl->sl_addr[i], source,
365 sizeof(struct in6_addr));
366 if (rv == 0)
367 break;
368 }
369 if (rv) /* source not found */
370 goto done; /* err = -EADDRNOTAVAIL */
371
372 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
373 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
374 leavegroup = 1;
375 goto done;
376 }
377
378 /* update the interface filter */
379 ip6_mc_del_src(idev, group, omode, 1, source, 1);
380
381 for (j=i+1; j<psl->sl_count; j++)
382 psl->sl_addr[j-1] = psl->sl_addr[j];
383 psl->sl_count--;
384 err = 0;
385 goto done;
386 }
387 /* else, add a new source to the filter */
388
389 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
390 err = -ENOBUFS;
391 goto done;
392 }
393 if (!psl || psl->sl_count == psl->sl_max) {
394 struct ip6_sf_socklist *newpsl;
395 int count = IP6_SFBLOCK;
396
397 if (psl)
398 count += psl->sl_max;
399 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
400 if (!newpsl) {
401 err = -ENOBUFS;
402 goto done;
403 }
404 newpsl->sl_max = count;
405 newpsl->sl_count = count - IP6_SFBLOCK;
406 if (psl) {
407 for (i=0; i<psl->sl_count; i++)
408 newpsl->sl_addr[i] = psl->sl_addr[i];
409 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
410 }
411 pmc->sflist = psl = newpsl;
412 }
413 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
414 for (i=0; i<psl->sl_count; i++) {
415 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
416 if (rv == 0)
417 break;
418 }
419 if (rv == 0) /* address already there is an error */
420 goto done;
421 for (j=psl->sl_count-1; j>=i; j--)
422 psl->sl_addr[j+1] = psl->sl_addr[j];
423 psl->sl_addr[i] = *source;
424 psl->sl_count++;
425 err = 0;
426 /* update the interface list */
427 ip6_mc_add_src(idev, group, omode, 1, source, 1);
428 done:
429 if (pmclocked)
430 write_unlock(&pmc->sflock);
431 read_unlock(&ipv6_sk_mc_lock);
432 read_unlock_bh(&idev->lock);
433 rcu_read_unlock();
434 if (leavegroup)
435 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
436 return err;
437 }
438
439 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
440 {
441 struct in6_addr *group;
442 struct ipv6_mc_socklist *pmc;
443 struct net_device *dev;
444 struct inet6_dev *idev;
445 struct ipv6_pinfo *inet6 = inet6_sk(sk);
446 struct ip6_sf_socklist *newpsl, *psl;
447 struct net *net = sock_net(sk);
448 int leavegroup = 0;
449 int i, err;
450
451 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
452
453 if (!ipv6_addr_is_multicast(group))
454 return -EINVAL;
455 if (gsf->gf_fmode != MCAST_INCLUDE &&
456 gsf->gf_fmode != MCAST_EXCLUDE)
457 return -EINVAL;
458
459 rcu_read_lock();
460 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
461
462 if (!idev) {
463 rcu_read_unlock();
464 return -ENODEV;
465 }
466 dev = idev->dev;
467
468 err = 0;
469 read_lock(&ipv6_sk_mc_lock);
470
471 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
472 leavegroup = 1;
473 goto done;
474 }
475
476 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
477 if (pmc->ifindex != gsf->gf_interface)
478 continue;
479 if (ipv6_addr_equal(&pmc->addr, group))
480 break;
481 }
482 if (!pmc) { /* must have a prior join */
483 err = -EINVAL;
484 goto done;
485 }
486 if (gsf->gf_numsrc) {
487 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
488 GFP_ATOMIC);
489 if (!newpsl) {
490 err = -ENOBUFS;
491 goto done;
492 }
493 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
494 for (i=0; i<newpsl->sl_count; ++i) {
495 struct sockaddr_in6 *psin6;
496
497 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
498 newpsl->sl_addr[i] = psin6->sin6_addr;
499 }
500 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
501 newpsl->sl_count, newpsl->sl_addr, 0);
502 if (err) {
503 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
504 goto done;
505 }
506 } else {
507 newpsl = NULL;
508 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
509 }
510
511 write_lock(&pmc->sflock);
512 psl = pmc->sflist;
513 if (psl) {
514 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
515 psl->sl_count, psl->sl_addr, 0);
516 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
517 } else
518 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
519 pmc->sflist = newpsl;
520 pmc->sfmode = gsf->gf_fmode;
521 write_unlock(&pmc->sflock);
522 err = 0;
523 done:
524 read_unlock(&ipv6_sk_mc_lock);
525 read_unlock_bh(&idev->lock);
526 rcu_read_unlock();
527 if (leavegroup)
528 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
529 return err;
530 }
531
532 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
533 struct group_filter __user *optval, int __user *optlen)
534 {
535 int err, i, count, copycount;
536 struct in6_addr *group;
537 struct ipv6_mc_socklist *pmc;
538 struct inet6_dev *idev;
539 struct net_device *dev;
540 struct ipv6_pinfo *inet6 = inet6_sk(sk);
541 struct ip6_sf_socklist *psl;
542 struct net *net = sock_net(sk);
543
544 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
545
546 if (!ipv6_addr_is_multicast(group))
547 return -EINVAL;
548
549 rcu_read_lock();
550 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
551
552 if (!idev) {
553 rcu_read_unlock();
554 return -ENODEV;
555 }
556 dev = idev->dev;
557
558 err = -EADDRNOTAVAIL;
559 /*
560 * changes to the ipv6_mc_list require the socket lock and
561 * a read lock on ip6_sk_mc_lock. We have the socket lock,
562 * so reading the list is safe.
563 */
564
565 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
566 if (pmc->ifindex != gsf->gf_interface)
567 continue;
568 if (ipv6_addr_equal(group, &pmc->addr))
569 break;
570 }
571 if (!pmc) /* must have a prior join */
572 goto done;
573 gsf->gf_fmode = pmc->sfmode;
574 psl = pmc->sflist;
575 count = psl ? psl->sl_count : 0;
576 read_unlock_bh(&idev->lock);
577 rcu_read_unlock();
578
579 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
580 gsf->gf_numsrc = count;
581 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
582 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
583 return -EFAULT;
584 }
585 /* changes to psl require the socket lock, a read lock on
586 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
587 * have the socket lock, so reading here is safe.
588 */
589 for (i=0; i<copycount; i++) {
590 struct sockaddr_in6 *psin6;
591 struct sockaddr_storage ss;
592
593 psin6 = (struct sockaddr_in6 *)&ss;
594 memset(&ss, 0, sizeof(ss));
595 psin6->sin6_family = AF_INET6;
596 psin6->sin6_addr = psl->sl_addr[i];
597 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
598 return -EFAULT;
599 }
600 return 0;
601 done:
602 read_unlock_bh(&idev->lock);
603 rcu_read_unlock();
604 return err;
605 }
606
607 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
608 const struct in6_addr *src_addr)
609 {
610 struct ipv6_pinfo *np = inet6_sk(sk);
611 struct ipv6_mc_socklist *mc;
612 struct ip6_sf_socklist *psl;
613 int rv = 1;
614
615 read_lock(&ipv6_sk_mc_lock);
616 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
617 if (ipv6_addr_equal(&mc->addr, mc_addr))
618 break;
619 }
620 if (!mc) {
621 read_unlock(&ipv6_sk_mc_lock);
622 return 1;
623 }
624 read_lock(&mc->sflock);
625 psl = mc->sflist;
626 if (!psl) {
627 rv = mc->sfmode == MCAST_EXCLUDE;
628 } else {
629 int i;
630
631 for (i=0; i<psl->sl_count; i++) {
632 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
633 break;
634 }
635 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
636 rv = 0;
637 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
638 rv = 0;
639 }
640 read_unlock(&mc->sflock);
641 read_unlock(&ipv6_sk_mc_lock);
642
643 return rv;
644 }
645
646 static void ma_put(struct ifmcaddr6 *mc)
647 {
648 if (atomic_dec_and_test(&mc->mca_refcnt)) {
649 in6_dev_put(mc->idev);
650 kfree(mc);
651 }
652 }
653
654 static void igmp6_group_added(struct ifmcaddr6 *mc)
655 {
656 struct net_device *dev = mc->idev->dev;
657 char buf[MAX_ADDR_LEN];
658
659 spin_lock_bh(&mc->mca_lock);
660 if (!(mc->mca_flags&MAF_LOADED)) {
661 mc->mca_flags |= MAF_LOADED;
662 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
663 dev_mc_add(dev, buf);
664 }
665 spin_unlock_bh(&mc->mca_lock);
666
667 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
668 return;
669
670 if (MLD_V1_SEEN(mc->idev)) {
671 igmp6_join_group(mc);
672 return;
673 }
674 /* else v2 */
675
676 mc->mca_crcount = mc->idev->mc_qrv;
677 mld_ifc_event(mc->idev);
678 }
679
680 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
681 {
682 struct net_device *dev = mc->idev->dev;
683 char buf[MAX_ADDR_LEN];
684
685 spin_lock_bh(&mc->mca_lock);
686 if (mc->mca_flags&MAF_LOADED) {
687 mc->mca_flags &= ~MAF_LOADED;
688 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
689 dev_mc_del(dev, buf);
690 }
691
692 if (mc->mca_flags & MAF_NOREPORT)
693 goto done;
694 spin_unlock_bh(&mc->mca_lock);
695
696 if (!mc->idev->dead)
697 igmp6_leave_group(mc);
698
699 spin_lock_bh(&mc->mca_lock);
700 if (del_timer(&mc->mca_timer))
701 atomic_dec(&mc->mca_refcnt);
702 done:
703 ip6_mc_clear_src(mc);
704 spin_unlock_bh(&mc->mca_lock);
705 }
706
707 /*
708 * deleted ifmcaddr6 manipulation
709 */
710 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
711 {
712 struct ifmcaddr6 *pmc;
713
714 /* this is an "ifmcaddr6" for convenience; only the fields below
715 * are actually used. In particular, the refcnt and users are not
716 * used for management of the delete list. Using the same structure
717 * for deleted items allows change reports to use common code with
718 * non-deleted or query-response MCA's.
719 */
720 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
721 if (!pmc)
722 return;
723
724 spin_lock_bh(&im->mca_lock);
725 spin_lock_init(&pmc->mca_lock);
726 pmc->idev = im->idev;
727 in6_dev_hold(idev);
728 pmc->mca_addr = im->mca_addr;
729 pmc->mca_crcount = idev->mc_qrv;
730 pmc->mca_sfmode = im->mca_sfmode;
731 if (pmc->mca_sfmode == MCAST_INCLUDE) {
732 struct ip6_sf_list *psf;
733
734 pmc->mca_tomb = im->mca_tomb;
735 pmc->mca_sources = im->mca_sources;
736 im->mca_tomb = im->mca_sources = NULL;
737 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
738 psf->sf_crcount = pmc->mca_crcount;
739 }
740 spin_unlock_bh(&im->mca_lock);
741
742 spin_lock_bh(&idev->mc_lock);
743 pmc->next = idev->mc_tomb;
744 idev->mc_tomb = pmc;
745 spin_unlock_bh(&idev->mc_lock);
746 }
747
748 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
749 {
750 struct ifmcaddr6 *pmc, *pmc_prev;
751 struct ip6_sf_list *psf, *psf_next;
752
753 spin_lock_bh(&idev->mc_lock);
754 pmc_prev = NULL;
755 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
756 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
757 break;
758 pmc_prev = pmc;
759 }
760 if (pmc) {
761 if (pmc_prev)
762 pmc_prev->next = pmc->next;
763 else
764 idev->mc_tomb = pmc->next;
765 }
766 spin_unlock_bh(&idev->mc_lock);
767
768 if (pmc) {
769 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
770 psf_next = psf->sf_next;
771 kfree(psf);
772 }
773 in6_dev_put(pmc->idev);
774 kfree(pmc);
775 }
776 }
777
778 static void mld_clear_delrec(struct inet6_dev *idev)
779 {
780 struct ifmcaddr6 *pmc, *nextpmc;
781
782 spin_lock_bh(&idev->mc_lock);
783 pmc = idev->mc_tomb;
784 idev->mc_tomb = NULL;
785 spin_unlock_bh(&idev->mc_lock);
786
787 for (; pmc; pmc = nextpmc) {
788 nextpmc = pmc->next;
789 ip6_mc_clear_src(pmc);
790 in6_dev_put(pmc->idev);
791 kfree(pmc);
792 }
793
794 /* clear dead sources, too */
795 read_lock_bh(&idev->lock);
796 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
797 struct ip6_sf_list *psf, *psf_next;
798
799 spin_lock_bh(&pmc->mca_lock);
800 psf = pmc->mca_tomb;
801 pmc->mca_tomb = NULL;
802 spin_unlock_bh(&pmc->mca_lock);
803 for (; psf; psf=psf_next) {
804 psf_next = psf->sf_next;
805 kfree(psf);
806 }
807 }
808 read_unlock_bh(&idev->lock);
809 }
810
811
812 /*
813 * device multicast group inc (add if not found)
814 */
815 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
816 {
817 struct ifmcaddr6 *mc;
818 struct inet6_dev *idev;
819
820 /* we need to take a reference on idev */
821 idev = in6_dev_get(dev);
822
823 if (idev == NULL)
824 return -EINVAL;
825
826 write_lock_bh(&idev->lock);
827 if (idev->dead) {
828 write_unlock_bh(&idev->lock);
829 in6_dev_put(idev);
830 return -ENODEV;
831 }
832
833 for (mc = idev->mc_list; mc; mc = mc->next) {
834 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
835 mc->mca_users++;
836 write_unlock_bh(&idev->lock);
837 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
838 NULL, 0);
839 in6_dev_put(idev);
840 return 0;
841 }
842 }
843
844 /*
845 * not found: create a new one.
846 */
847
848 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
849
850 if (mc == NULL) {
851 write_unlock_bh(&idev->lock);
852 in6_dev_put(idev);
853 return -ENOMEM;
854 }
855
856 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
857
858 ipv6_addr_copy(&mc->mca_addr, addr);
859 mc->idev = idev; /* (reference taken) */
860 mc->mca_users = 1;
861 /* mca_stamp should be updated upon changes */
862 mc->mca_cstamp = mc->mca_tstamp = jiffies;
863 atomic_set(&mc->mca_refcnt, 2);
864 spin_lock_init(&mc->mca_lock);
865
866 /* initial mode is (EX, empty) */
867 mc->mca_sfmode = MCAST_EXCLUDE;
868 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
869
870 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
871 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
872 mc->mca_flags |= MAF_NOREPORT;
873
874 mc->next = idev->mc_list;
875 idev->mc_list = mc;
876 write_unlock_bh(&idev->lock);
877
878 mld_del_delrec(idev, &mc->mca_addr);
879 igmp6_group_added(mc);
880 ma_put(mc);
881 return 0;
882 }
883
884 /*
885 * device multicast group del
886 */
887 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
888 {
889 struct ifmcaddr6 *ma, **map;
890
891 write_lock_bh(&idev->lock);
892 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
893 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
894 if (--ma->mca_users == 0) {
895 *map = ma->next;
896 write_unlock_bh(&idev->lock);
897
898 igmp6_group_dropped(ma);
899
900 ma_put(ma);
901 return 0;
902 }
903 write_unlock_bh(&idev->lock);
904 return 0;
905 }
906 }
907 write_unlock_bh(&idev->lock);
908
909 return -ENOENT;
910 }
911
912 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
913 {
914 struct inet6_dev *idev;
915 int err;
916
917 rcu_read_lock();
918
919 idev = __in6_dev_get(dev);
920 if (!idev)
921 err = -ENODEV;
922 else
923 err = __ipv6_dev_mc_dec(idev, addr);
924
925 rcu_read_unlock();
926 return err;
927 }
928
929 /*
930 * identify MLD packets for MLD filter exceptions
931 */
932 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
933 {
934 struct icmp6hdr *pic;
935
936 if (nexthdr != IPPROTO_ICMPV6)
937 return 0;
938
939 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
940 return 0;
941
942 pic = icmp6_hdr(skb);
943
944 switch (pic->icmp6_type) {
945 case ICMPV6_MGM_QUERY:
946 case ICMPV6_MGM_REPORT:
947 case ICMPV6_MGM_REDUCTION:
948 case ICMPV6_MLD2_REPORT:
949 return 1;
950 default:
951 break;
952 }
953 return 0;
954 }
955
956 /*
957 * check if the interface/address pair is valid
958 */
959 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
960 const struct in6_addr *src_addr)
961 {
962 struct inet6_dev *idev;
963 struct ifmcaddr6 *mc;
964 int rv = 0;
965
966 rcu_read_lock();
967 idev = __in6_dev_get(dev);
968 if (idev) {
969 read_lock_bh(&idev->lock);
970 for (mc = idev->mc_list; mc; mc=mc->next) {
971 if (ipv6_addr_equal(&mc->mca_addr, group))
972 break;
973 }
974 if (mc) {
975 if (src_addr && !ipv6_addr_any(src_addr)) {
976 struct ip6_sf_list *psf;
977
978 spin_lock_bh(&mc->mca_lock);
979 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
980 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
981 break;
982 }
983 if (psf)
984 rv = psf->sf_count[MCAST_INCLUDE] ||
985 psf->sf_count[MCAST_EXCLUDE] !=
986 mc->mca_sfcount[MCAST_EXCLUDE];
987 else
988 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
989 spin_unlock_bh(&mc->mca_lock);
990 } else
991 rv = 1; /* don't filter unspecified source */
992 }
993 read_unlock_bh(&idev->lock);
994 }
995 rcu_read_unlock();
996 return rv;
997 }
998
999 static void mld_gq_start_timer(struct inet6_dev *idev)
1000 {
1001 int tv = net_random() % idev->mc_maxdelay;
1002
1003 idev->mc_gq_running = 1;
1004 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1005 in6_dev_hold(idev);
1006 }
1007
1008 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1009 {
1010 int tv = net_random() % delay;
1011
1012 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1013 in6_dev_hold(idev);
1014 }
1015
1016 /*
1017 * IGMP handling (alias multicast ICMPv6 messages)
1018 */
1019
1020 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1021 {
1022 unsigned long delay = resptime;
1023
1024 /* Do not start timer for these addresses */
1025 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1026 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1027 return;
1028
1029 if (del_timer(&ma->mca_timer)) {
1030 atomic_dec(&ma->mca_refcnt);
1031 delay = ma->mca_timer.expires - jiffies;
1032 }
1033
1034 if (delay >= resptime) {
1035 if (resptime)
1036 delay = net_random() % resptime;
1037 else
1038 delay = 1;
1039 }
1040 ma->mca_timer.expires = jiffies + delay;
1041 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1042 atomic_inc(&ma->mca_refcnt);
1043 ma->mca_flags |= MAF_TIMER_RUNNING;
1044 }
1045
1046 /* mark EXCLUDE-mode sources */
1047 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1048 struct in6_addr *srcs)
1049 {
1050 struct ip6_sf_list *psf;
1051 int i, scount;
1052
1053 scount = 0;
1054 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1055 if (scount == nsrcs)
1056 break;
1057 for (i=0; i<nsrcs; i++) {
1058 /* skip inactive filters */
1059 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1060 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1061 psf->sf_count[MCAST_EXCLUDE])
1062 continue;
1063 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1064 scount++;
1065 break;
1066 }
1067 }
1068 }
1069 pmc->mca_flags &= ~MAF_GSQUERY;
1070 if (scount == nsrcs) /* all sources excluded */
1071 return 0;
1072 return 1;
1073 }
1074
1075 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1076 struct in6_addr *srcs)
1077 {
1078 struct ip6_sf_list *psf;
1079 int i, scount;
1080
1081 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1082 return mld_xmarksources(pmc, nsrcs, srcs);
1083
1084 /* mark INCLUDE-mode sources */
1085
1086 scount = 0;
1087 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1088 if (scount == nsrcs)
1089 break;
1090 for (i=0; i<nsrcs; i++) {
1091 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1092 psf->sf_gsresp = 1;
1093 scount++;
1094 break;
1095 }
1096 }
1097 }
1098 if (!scount) {
1099 pmc->mca_flags &= ~MAF_GSQUERY;
1100 return 0;
1101 }
1102 pmc->mca_flags |= MAF_GSQUERY;
1103 return 1;
1104 }
1105
1106 /* called with rcu_read_lock() */
1107 int igmp6_event_query(struct sk_buff *skb)
1108 {
1109 struct mld2_query *mlh2 = NULL;
1110 struct ifmcaddr6 *ma;
1111 struct in6_addr *group;
1112 unsigned long max_delay;
1113 struct inet6_dev *idev;
1114 struct mld_msg *mld;
1115 int group_type;
1116 int mark = 0;
1117 int len;
1118
1119 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1120 return -EINVAL;
1121
1122 /* compute payload length excluding extension headers */
1123 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1124 len -= skb_network_header_len(skb);
1125
1126 /* Drop queries with not link local source */
1127 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1128 return -EINVAL;
1129
1130 idev = __in6_dev_get(skb->dev);
1131
1132 if (idev == NULL)
1133 return 0;
1134
1135 mld = (struct mld_msg *)icmp6_hdr(skb);
1136 group = &mld->mld_mca;
1137 group_type = ipv6_addr_type(group);
1138
1139 if (group_type != IPV6_ADDR_ANY &&
1140 !(group_type&IPV6_ADDR_MULTICAST))
1141 return -EINVAL;
1142
1143 if (len == 24) {
1144 int switchback;
1145 /* MLDv1 router present */
1146
1147 /* Translate milliseconds to jiffies */
1148 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1149
1150 switchback = (idev->mc_qrv + 1) * max_delay;
1151 idev->mc_v1_seen = jiffies + switchback;
1152
1153 /* cancel the interface change timer */
1154 idev->mc_ifc_count = 0;
1155 if (del_timer(&idev->mc_ifc_timer))
1156 __in6_dev_put(idev);
1157 /* clear deleted report items */
1158 mld_clear_delrec(idev);
1159 } else if (len >= 28) {
1160 int srcs_offset = sizeof(struct mld2_query) -
1161 sizeof(struct icmp6hdr);
1162 if (!pskb_may_pull(skb, srcs_offset))
1163 return -EINVAL;
1164
1165 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1166 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1167 if (!max_delay)
1168 max_delay = 1;
1169 idev->mc_maxdelay = max_delay;
1170 if (mlh2->mld2q_qrv)
1171 idev->mc_qrv = mlh2->mld2q_qrv;
1172 if (group_type == IPV6_ADDR_ANY) { /* general query */
1173 if (mlh2->mld2q_nsrcs)
1174 return -EINVAL; /* no sources allowed */
1175
1176 mld_gq_start_timer(idev);
1177 return 0;
1178 }
1179 /* mark sources to include, if group & source-specific */
1180 if (mlh2->mld2q_nsrcs != 0) {
1181 if (!pskb_may_pull(skb, srcs_offset +
1182 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1183 return -EINVAL;
1184
1185 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1186 mark = 1;
1187 }
1188 } else
1189 return -EINVAL;
1190
1191 read_lock_bh(&idev->lock);
1192 if (group_type == IPV6_ADDR_ANY) {
1193 for (ma = idev->mc_list; ma; ma=ma->next) {
1194 spin_lock_bh(&ma->mca_lock);
1195 igmp6_group_queried(ma, max_delay);
1196 spin_unlock_bh(&ma->mca_lock);
1197 }
1198 } else {
1199 for (ma = idev->mc_list; ma; ma=ma->next) {
1200 if (!ipv6_addr_equal(group, &ma->mca_addr))
1201 continue;
1202 spin_lock_bh(&ma->mca_lock);
1203 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1204 /* gsquery <- gsquery && mark */
1205 if (!mark)
1206 ma->mca_flags &= ~MAF_GSQUERY;
1207 } else {
1208 /* gsquery <- mark */
1209 if (mark)
1210 ma->mca_flags |= MAF_GSQUERY;
1211 else
1212 ma->mca_flags &= ~MAF_GSQUERY;
1213 }
1214 if (!(ma->mca_flags & MAF_GSQUERY) ||
1215 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1216 igmp6_group_queried(ma, max_delay);
1217 spin_unlock_bh(&ma->mca_lock);
1218 break;
1219 }
1220 }
1221 read_unlock_bh(&idev->lock);
1222
1223 return 0;
1224 }
1225
1226 /* called with rcu_read_lock() */
1227 int igmp6_event_report(struct sk_buff *skb)
1228 {
1229 struct ifmcaddr6 *ma;
1230 struct inet6_dev *idev;
1231 struct mld_msg *mld;
1232 int addr_type;
1233
1234 /* Our own report looped back. Ignore it. */
1235 if (skb->pkt_type == PACKET_LOOPBACK)
1236 return 0;
1237
1238 /* send our report if the MC router may not have heard this report */
1239 if (skb->pkt_type != PACKET_MULTICAST &&
1240 skb->pkt_type != PACKET_BROADCAST)
1241 return 0;
1242
1243 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1244 return -EINVAL;
1245
1246 mld = (struct mld_msg *)icmp6_hdr(skb);
1247
1248 /* Drop reports with not link local source */
1249 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1250 if (addr_type != IPV6_ADDR_ANY &&
1251 !(addr_type&IPV6_ADDR_LINKLOCAL))
1252 return -EINVAL;
1253
1254 idev = __in6_dev_get(skb->dev);
1255 if (idev == NULL)
1256 return -ENODEV;
1257
1258 /*
1259 * Cancel the timer for this group
1260 */
1261
1262 read_lock_bh(&idev->lock);
1263 for (ma = idev->mc_list; ma; ma=ma->next) {
1264 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1265 spin_lock(&ma->mca_lock);
1266 if (del_timer(&ma->mca_timer))
1267 atomic_dec(&ma->mca_refcnt);
1268 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1269 spin_unlock(&ma->mca_lock);
1270 break;
1271 }
1272 }
1273 read_unlock_bh(&idev->lock);
1274 return 0;
1275 }
1276
1277 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1278 int gdeleted, int sdeleted)
1279 {
1280 switch (type) {
1281 case MLD2_MODE_IS_INCLUDE:
1282 case MLD2_MODE_IS_EXCLUDE:
1283 if (gdeleted || sdeleted)
1284 return 0;
1285 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1286 if (pmc->mca_sfmode == MCAST_INCLUDE)
1287 return 1;
1288 /* don't include if this source is excluded
1289 * in all filters
1290 */
1291 if (psf->sf_count[MCAST_INCLUDE])
1292 return type == MLD2_MODE_IS_INCLUDE;
1293 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1294 psf->sf_count[MCAST_EXCLUDE];
1295 }
1296 return 0;
1297 case MLD2_CHANGE_TO_INCLUDE:
1298 if (gdeleted || sdeleted)
1299 return 0;
1300 return psf->sf_count[MCAST_INCLUDE] != 0;
1301 case MLD2_CHANGE_TO_EXCLUDE:
1302 if (gdeleted || sdeleted)
1303 return 0;
1304 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1305 psf->sf_count[MCAST_INCLUDE])
1306 return 0;
1307 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1308 psf->sf_count[MCAST_EXCLUDE];
1309 case MLD2_ALLOW_NEW_SOURCES:
1310 if (gdeleted || !psf->sf_crcount)
1311 return 0;
1312 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1313 case MLD2_BLOCK_OLD_SOURCES:
1314 if (pmc->mca_sfmode == MCAST_INCLUDE)
1315 return gdeleted || (psf->sf_crcount && sdeleted);
1316 return psf->sf_crcount && !gdeleted && !sdeleted;
1317 }
1318 return 0;
1319 }
1320
1321 static int
1322 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1323 {
1324 struct ip6_sf_list *psf;
1325 int scount = 0;
1326
1327 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1328 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1329 continue;
1330 scount++;
1331 }
1332 return scount;
1333 }
1334
1335 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1336 {
1337 struct net *net = dev_net(dev);
1338 struct sock *sk = net->ipv6.igmp_sk;
1339 struct sk_buff *skb;
1340 struct mld2_report *pmr;
1341 struct in6_addr addr_buf;
1342 const struct in6_addr *saddr;
1343 int err;
1344 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1345 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1346 IPV6_TLV_PADN, 0 };
1347
1348 /* we assume size > sizeof(ra) here */
1349 size += LL_ALLOCATED_SPACE(dev);
1350 /* limit our allocations to order-0 page */
1351 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1352 skb = sock_alloc_send_skb(sk, size, 1, &err);
1353
1354 if (!skb)
1355 return NULL;
1356
1357 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1358
1359 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1360 /* <draft-ietf-magma-mld-source-05.txt>:
1361 * use unspecified address as the source address
1362 * when a valid link-local address is not available.
1363 */
1364 saddr = &in6addr_any;
1365 } else
1366 saddr = &addr_buf;
1367
1368 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1369
1370 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1371
1372 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1373 skb_put(skb, sizeof(*pmr));
1374 pmr = (struct mld2_report *)skb_transport_header(skb);
1375 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1376 pmr->mld2r_resv1 = 0;
1377 pmr->mld2r_cksum = 0;
1378 pmr->mld2r_resv2 = 0;
1379 pmr->mld2r_ngrec = 0;
1380 return skb;
1381 }
1382
1383 static void mld_sendpack(struct sk_buff *skb)
1384 {
1385 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1386 struct mld2_report *pmr =
1387 (struct mld2_report *)skb_transport_header(skb);
1388 int payload_len, mldlen;
1389 struct inet6_dev *idev;
1390 struct net *net = dev_net(skb->dev);
1391 int err;
1392 struct flowi fl;
1393 struct dst_entry *dst;
1394
1395 rcu_read_lock();
1396 idev = __in6_dev_get(skb->dev);
1397 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1398
1399 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1400 mldlen = skb->tail - skb->transport_header;
1401 pip6->payload_len = htons(payload_len);
1402
1403 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1404 IPPROTO_ICMPV6,
1405 csum_partial(skb_transport_header(skb),
1406 mldlen, 0));
1407
1408 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1409
1410 if (!dst) {
1411 err = -ENOMEM;
1412 goto err_out;
1413 }
1414
1415 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
1416 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1417 skb->dev->ifindex);
1418
1419 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1420 skb_dst_set(skb, dst);
1421 if (err)
1422 goto err_out;
1423
1424 payload_len = skb->len;
1425
1426 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1427 dst_output);
1428 out:
1429 if (!err) {
1430 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1431 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1432 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1433 } else
1434 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1435
1436 rcu_read_unlock();
1437 return;
1438
1439 err_out:
1440 kfree_skb(skb);
1441 goto out;
1442 }
1443
1444 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1445 {
1446 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1447 }
1448
1449 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1450 int type, struct mld2_grec **ppgr)
1451 {
1452 struct net_device *dev = pmc->idev->dev;
1453 struct mld2_report *pmr;
1454 struct mld2_grec *pgr;
1455
1456 if (!skb)
1457 skb = mld_newpack(dev, dev->mtu);
1458 if (!skb)
1459 return NULL;
1460 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1461 pgr->grec_type = type;
1462 pgr->grec_auxwords = 0;
1463 pgr->grec_nsrcs = 0;
1464 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1465 pmr = (struct mld2_report *)skb_transport_header(skb);
1466 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1467 *ppgr = pgr;
1468 return skb;
1469 }
1470
1471 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1472 skb_tailroom(skb)) : 0)
1473
1474 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1475 int type, int gdeleted, int sdeleted)
1476 {
1477 struct net_device *dev = pmc->idev->dev;
1478 struct mld2_report *pmr;
1479 struct mld2_grec *pgr = NULL;
1480 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1481 int scount, stotal, first, isquery, truncate;
1482
1483 if (pmc->mca_flags & MAF_NOREPORT)
1484 return skb;
1485
1486 isquery = type == MLD2_MODE_IS_INCLUDE ||
1487 type == MLD2_MODE_IS_EXCLUDE;
1488 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1489 type == MLD2_CHANGE_TO_EXCLUDE;
1490
1491 stotal = scount = 0;
1492
1493 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1494
1495 if (!*psf_list)
1496 goto empty_source;
1497
1498 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1499
1500 /* EX and TO_EX get a fresh packet, if needed */
1501 if (truncate) {
1502 if (pmr && pmr->mld2r_ngrec &&
1503 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1504 if (skb)
1505 mld_sendpack(skb);
1506 skb = mld_newpack(dev, dev->mtu);
1507 }
1508 }
1509 first = 1;
1510 psf_prev = NULL;
1511 for (psf=*psf_list; psf; psf=psf_next) {
1512 struct in6_addr *psrc;
1513
1514 psf_next = psf->sf_next;
1515
1516 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1517 psf_prev = psf;
1518 continue;
1519 }
1520
1521 /* clear marks on query responses */
1522 if (isquery)
1523 psf->sf_gsresp = 0;
1524
1525 if (AVAILABLE(skb) < sizeof(*psrc) +
1526 first*sizeof(struct mld2_grec)) {
1527 if (truncate && !first)
1528 break; /* truncate these */
1529 if (pgr)
1530 pgr->grec_nsrcs = htons(scount);
1531 if (skb)
1532 mld_sendpack(skb);
1533 skb = mld_newpack(dev, dev->mtu);
1534 first = 1;
1535 scount = 0;
1536 }
1537 if (first) {
1538 skb = add_grhead(skb, pmc, type, &pgr);
1539 first = 0;
1540 }
1541 if (!skb)
1542 return NULL;
1543 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1544 *psrc = psf->sf_addr;
1545 scount++; stotal++;
1546 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1547 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1548 psf->sf_crcount--;
1549 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1550 if (psf_prev)
1551 psf_prev->sf_next = psf->sf_next;
1552 else
1553 *psf_list = psf->sf_next;
1554 kfree(psf);
1555 continue;
1556 }
1557 }
1558 psf_prev = psf;
1559 }
1560
1561 empty_source:
1562 if (!stotal) {
1563 if (type == MLD2_ALLOW_NEW_SOURCES ||
1564 type == MLD2_BLOCK_OLD_SOURCES)
1565 return skb;
1566 if (pmc->mca_crcount || isquery) {
1567 /* make sure we have room for group header */
1568 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1569 mld_sendpack(skb);
1570 skb = NULL; /* add_grhead will get a new one */
1571 }
1572 skb = add_grhead(skb, pmc, type, &pgr);
1573 }
1574 }
1575 if (pgr)
1576 pgr->grec_nsrcs = htons(scount);
1577
1578 if (isquery)
1579 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1580 return skb;
1581 }
1582
1583 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1584 {
1585 struct sk_buff *skb = NULL;
1586 int type;
1587
1588 if (!pmc) {
1589 read_lock_bh(&idev->lock);
1590 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1591 if (pmc->mca_flags & MAF_NOREPORT)
1592 continue;
1593 spin_lock_bh(&pmc->mca_lock);
1594 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1595 type = MLD2_MODE_IS_EXCLUDE;
1596 else
1597 type = MLD2_MODE_IS_INCLUDE;
1598 skb = add_grec(skb, pmc, type, 0, 0);
1599 spin_unlock_bh(&pmc->mca_lock);
1600 }
1601 read_unlock_bh(&idev->lock);
1602 } else {
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 if (skb)
1612 mld_sendpack(skb);
1613 }
1614
1615 /*
1616 * remove zero-count source records from a source filter list
1617 */
1618 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1619 {
1620 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1621
1622 psf_prev = NULL;
1623 for (psf=*ppsf; psf; psf = psf_next) {
1624 psf_next = psf->sf_next;
1625 if (psf->sf_crcount == 0) {
1626 if (psf_prev)
1627 psf_prev->sf_next = psf->sf_next;
1628 else
1629 *ppsf = psf->sf_next;
1630 kfree(psf);
1631 } else
1632 psf_prev = psf;
1633 }
1634 }
1635
1636 static void mld_send_cr(struct inet6_dev *idev)
1637 {
1638 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1639 struct sk_buff *skb = NULL;
1640 int type, dtype;
1641
1642 read_lock_bh(&idev->lock);
1643 spin_lock(&idev->mc_lock);
1644
1645 /* deleted MCA's */
1646 pmc_prev = NULL;
1647 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1648 pmc_next = pmc->next;
1649 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1650 type = MLD2_BLOCK_OLD_SOURCES;
1651 dtype = MLD2_BLOCK_OLD_SOURCES;
1652 skb = add_grec(skb, pmc, type, 1, 0);
1653 skb = add_grec(skb, pmc, dtype, 1, 1);
1654 }
1655 if (pmc->mca_crcount) {
1656 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1657 type = MLD2_CHANGE_TO_INCLUDE;
1658 skb = add_grec(skb, pmc, type, 1, 0);
1659 }
1660 pmc->mca_crcount--;
1661 if (pmc->mca_crcount == 0) {
1662 mld_clear_zeros(&pmc->mca_tomb);
1663 mld_clear_zeros(&pmc->mca_sources);
1664 }
1665 }
1666 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1667 !pmc->mca_sources) {
1668 if (pmc_prev)
1669 pmc_prev->next = pmc_next;
1670 else
1671 idev->mc_tomb = pmc_next;
1672 in6_dev_put(pmc->idev);
1673 kfree(pmc);
1674 } else
1675 pmc_prev = pmc;
1676 }
1677 spin_unlock(&idev->mc_lock);
1678
1679 /* change recs */
1680 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1681 spin_lock_bh(&pmc->mca_lock);
1682 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1683 type = MLD2_BLOCK_OLD_SOURCES;
1684 dtype = MLD2_ALLOW_NEW_SOURCES;
1685 } else {
1686 type = MLD2_ALLOW_NEW_SOURCES;
1687 dtype = MLD2_BLOCK_OLD_SOURCES;
1688 }
1689 skb = add_grec(skb, pmc, type, 0, 0);
1690 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1691
1692 /* filter mode changes */
1693 if (pmc->mca_crcount) {
1694 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1695 type = MLD2_CHANGE_TO_EXCLUDE;
1696 else
1697 type = MLD2_CHANGE_TO_INCLUDE;
1698 skb = add_grec(skb, pmc, type, 0, 0);
1699 pmc->mca_crcount--;
1700 }
1701 spin_unlock_bh(&pmc->mca_lock);
1702 }
1703 read_unlock_bh(&idev->lock);
1704 if (!skb)
1705 return;
1706 (void) mld_sendpack(skb);
1707 }
1708
1709 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1710 {
1711 struct net *net = dev_net(dev);
1712 struct sock *sk = net->ipv6.igmp_sk;
1713 struct inet6_dev *idev;
1714 struct sk_buff *skb;
1715 struct mld_msg *hdr;
1716 const struct in6_addr *snd_addr, *saddr;
1717 struct in6_addr addr_buf;
1718 int err, len, payload_len, full_len;
1719 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1720 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1721 IPV6_TLV_PADN, 0 };
1722 struct flowi fl;
1723 struct dst_entry *dst;
1724
1725 if (type == ICMPV6_MGM_REDUCTION)
1726 snd_addr = &in6addr_linklocal_allrouters;
1727 else
1728 snd_addr = addr;
1729
1730 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1731 payload_len = len + sizeof(ra);
1732 full_len = sizeof(struct ipv6hdr) + payload_len;
1733
1734 rcu_read_lock();
1735 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1736 IPSTATS_MIB_OUT, full_len);
1737 rcu_read_unlock();
1738
1739 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1740
1741 if (skb == NULL) {
1742 rcu_read_lock();
1743 IP6_INC_STATS(net, __in6_dev_get(dev),
1744 IPSTATS_MIB_OUTDISCARDS);
1745 rcu_read_unlock();
1746 return;
1747 }
1748
1749 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1750
1751 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1752 /* <draft-ietf-magma-mld-source-05.txt>:
1753 * use unspecified address as the source address
1754 * when a valid link-local address is not available.
1755 */
1756 saddr = &in6addr_any;
1757 } else
1758 saddr = &addr_buf;
1759
1760 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1761
1762 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1763
1764 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1765 memset(hdr, 0, sizeof(struct mld_msg));
1766 hdr->mld_type = type;
1767 ipv6_addr_copy(&hdr->mld_mca, addr);
1768
1769 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1770 IPPROTO_ICMPV6,
1771 csum_partial(hdr, len, 0));
1772
1773 rcu_read_lock();
1774 idev = __in6_dev_get(skb->dev);
1775
1776 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1777 if (!dst) {
1778 err = -ENOMEM;
1779 goto err_out;
1780 }
1781
1782 icmpv6_flow_init(sk, &fl, type,
1783 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1784 skb->dev->ifindex);
1785
1786 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1787 if (err)
1788 goto err_out;
1789
1790 skb_dst_set(skb, dst);
1791 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1792 dst_output);
1793 out:
1794 if (!err) {
1795 ICMP6MSGOUT_INC_STATS(net, idev, type);
1796 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1797 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1798 } else
1799 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1800
1801 rcu_read_unlock();
1802 return;
1803
1804 err_out:
1805 kfree_skb(skb);
1806 goto out;
1807 }
1808
1809 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1810 struct in6_addr *psfsrc)
1811 {
1812 struct ip6_sf_list *psf, *psf_prev;
1813 int rv = 0;
1814
1815 psf_prev = NULL;
1816 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1817 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1818 break;
1819 psf_prev = psf;
1820 }
1821 if (!psf || psf->sf_count[sfmode] == 0) {
1822 /* source filter not found, or count wrong => bug */
1823 return -ESRCH;
1824 }
1825 psf->sf_count[sfmode]--;
1826 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1827 struct inet6_dev *idev = pmc->idev;
1828
1829 /* no more filters for this source */
1830 if (psf_prev)
1831 psf_prev->sf_next = psf->sf_next;
1832 else
1833 pmc->mca_sources = psf->sf_next;
1834 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1835 !MLD_V1_SEEN(idev)) {
1836 psf->sf_crcount = idev->mc_qrv;
1837 psf->sf_next = pmc->mca_tomb;
1838 pmc->mca_tomb = psf;
1839 rv = 1;
1840 } else
1841 kfree(psf);
1842 }
1843 return rv;
1844 }
1845
1846 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1847 int sfmode, int sfcount, struct in6_addr *psfsrc,
1848 int delta)
1849 {
1850 struct ifmcaddr6 *pmc;
1851 int changerec = 0;
1852 int i, err;
1853
1854 if (!idev)
1855 return -ENODEV;
1856 read_lock_bh(&idev->lock);
1857 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1858 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1859 break;
1860 }
1861 if (!pmc) {
1862 /* MCA not found?? bug */
1863 read_unlock_bh(&idev->lock);
1864 return -ESRCH;
1865 }
1866 spin_lock_bh(&pmc->mca_lock);
1867 sf_markstate(pmc);
1868 if (!delta) {
1869 if (!pmc->mca_sfcount[sfmode]) {
1870 spin_unlock_bh(&pmc->mca_lock);
1871 read_unlock_bh(&idev->lock);
1872 return -EINVAL;
1873 }
1874 pmc->mca_sfcount[sfmode]--;
1875 }
1876 err = 0;
1877 for (i=0; i<sfcount; i++) {
1878 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1879
1880 changerec |= rv > 0;
1881 if (!err && rv < 0)
1882 err = rv;
1883 }
1884 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1885 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1886 pmc->mca_sfcount[MCAST_INCLUDE]) {
1887 struct ip6_sf_list *psf;
1888
1889 /* filter mode change */
1890 pmc->mca_sfmode = MCAST_INCLUDE;
1891 pmc->mca_crcount = idev->mc_qrv;
1892 idev->mc_ifc_count = pmc->mca_crcount;
1893 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1894 psf->sf_crcount = 0;
1895 mld_ifc_event(pmc->idev);
1896 } else if (sf_setstate(pmc) || changerec)
1897 mld_ifc_event(pmc->idev);
1898 spin_unlock_bh(&pmc->mca_lock);
1899 read_unlock_bh(&idev->lock);
1900 return err;
1901 }
1902
1903 /*
1904 * Add multicast single-source filter to the interface list
1905 */
1906 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1907 struct in6_addr *psfsrc, int delta)
1908 {
1909 struct ip6_sf_list *psf, *psf_prev;
1910
1911 psf_prev = NULL;
1912 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1913 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1914 break;
1915 psf_prev = psf;
1916 }
1917 if (!psf) {
1918 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1919 if (!psf)
1920 return -ENOBUFS;
1921
1922 psf->sf_addr = *psfsrc;
1923 if (psf_prev) {
1924 psf_prev->sf_next = psf;
1925 } else
1926 pmc->mca_sources = psf;
1927 }
1928 psf->sf_count[sfmode]++;
1929 return 0;
1930 }
1931
1932 static void sf_markstate(struct ifmcaddr6 *pmc)
1933 {
1934 struct ip6_sf_list *psf;
1935 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1936
1937 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1938 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1939 psf->sf_oldin = mca_xcount ==
1940 psf->sf_count[MCAST_EXCLUDE] &&
1941 !psf->sf_count[MCAST_INCLUDE];
1942 } else
1943 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1944 }
1945
1946 static int sf_setstate(struct ifmcaddr6 *pmc)
1947 {
1948 struct ip6_sf_list *psf, *dpsf;
1949 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1950 int qrv = pmc->idev->mc_qrv;
1951 int new_in, rv;
1952
1953 rv = 0;
1954 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1955 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1956 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1957 !psf->sf_count[MCAST_INCLUDE];
1958 } else
1959 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1960 if (new_in) {
1961 if (!psf->sf_oldin) {
1962 struct ip6_sf_list *prev = NULL;
1963
1964 for (dpsf=pmc->mca_tomb; dpsf;
1965 dpsf=dpsf->sf_next) {
1966 if (ipv6_addr_equal(&dpsf->sf_addr,
1967 &psf->sf_addr))
1968 break;
1969 prev = dpsf;
1970 }
1971 if (dpsf) {
1972 if (prev)
1973 prev->sf_next = dpsf->sf_next;
1974 else
1975 pmc->mca_tomb = dpsf->sf_next;
1976 kfree(dpsf);
1977 }
1978 psf->sf_crcount = qrv;
1979 rv++;
1980 }
1981 } else if (psf->sf_oldin) {
1982 psf->sf_crcount = 0;
1983 /*
1984 * add or update "delete" records if an active filter
1985 * is now inactive
1986 */
1987 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1988 if (ipv6_addr_equal(&dpsf->sf_addr,
1989 &psf->sf_addr))
1990 break;
1991 if (!dpsf) {
1992 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1993 if (!dpsf)
1994 continue;
1995 *dpsf = *psf;
1996 /* pmc->mca_lock held by callers */
1997 dpsf->sf_next = pmc->mca_tomb;
1998 pmc->mca_tomb = dpsf;
1999 }
2000 dpsf->sf_crcount = qrv;
2001 rv++;
2002 }
2003 }
2004 return rv;
2005 }
2006
2007 /*
2008 * Add multicast source filter list to the interface list
2009 */
2010 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2011 int sfmode, int sfcount, struct in6_addr *psfsrc,
2012 int delta)
2013 {
2014 struct ifmcaddr6 *pmc;
2015 int isexclude;
2016 int i, err;
2017
2018 if (!idev)
2019 return -ENODEV;
2020 read_lock_bh(&idev->lock);
2021 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2022 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2023 break;
2024 }
2025 if (!pmc) {
2026 /* MCA not found?? bug */
2027 read_unlock_bh(&idev->lock);
2028 return -ESRCH;
2029 }
2030 spin_lock_bh(&pmc->mca_lock);
2031
2032 sf_markstate(pmc);
2033 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2034 if (!delta)
2035 pmc->mca_sfcount[sfmode]++;
2036 err = 0;
2037 for (i=0; i<sfcount; i++) {
2038 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2039 if (err)
2040 break;
2041 }
2042 if (err) {
2043 int j;
2044
2045 if (!delta)
2046 pmc->mca_sfcount[sfmode]--;
2047 for (j=0; j<i; j++)
2048 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2049 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2050 struct ip6_sf_list *psf;
2051
2052 /* filter mode change */
2053 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2054 pmc->mca_sfmode = MCAST_EXCLUDE;
2055 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2056 pmc->mca_sfmode = MCAST_INCLUDE;
2057 /* else no filters; keep old mode for reports */
2058
2059 pmc->mca_crcount = idev->mc_qrv;
2060 idev->mc_ifc_count = pmc->mca_crcount;
2061 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2062 psf->sf_crcount = 0;
2063 mld_ifc_event(idev);
2064 } else if (sf_setstate(pmc))
2065 mld_ifc_event(idev);
2066 spin_unlock_bh(&pmc->mca_lock);
2067 read_unlock_bh(&idev->lock);
2068 return err;
2069 }
2070
2071 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2072 {
2073 struct ip6_sf_list *psf, *nextpsf;
2074
2075 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2076 nextpsf = psf->sf_next;
2077 kfree(psf);
2078 }
2079 pmc->mca_tomb = NULL;
2080 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2081 nextpsf = psf->sf_next;
2082 kfree(psf);
2083 }
2084 pmc->mca_sources = NULL;
2085 pmc->mca_sfmode = MCAST_EXCLUDE;
2086 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2087 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2088 }
2089
2090
2091 static void igmp6_join_group(struct ifmcaddr6 *ma)
2092 {
2093 unsigned long delay;
2094
2095 if (ma->mca_flags & MAF_NOREPORT)
2096 return;
2097
2098 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2099
2100 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2101
2102 spin_lock_bh(&ma->mca_lock);
2103 if (del_timer(&ma->mca_timer)) {
2104 atomic_dec(&ma->mca_refcnt);
2105 delay = ma->mca_timer.expires - jiffies;
2106 }
2107
2108 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2109 atomic_inc(&ma->mca_refcnt);
2110 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2111 spin_unlock_bh(&ma->mca_lock);
2112 }
2113
2114 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2115 struct inet6_dev *idev)
2116 {
2117 int err;
2118
2119 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2120 * so no other readers or writers of iml or its sflist
2121 */
2122 if (!iml->sflist) {
2123 /* any-source empty exclude case */
2124 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2125 }
2126 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2127 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2128 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2129 iml->sflist = NULL;
2130 return err;
2131 }
2132
2133 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2134 {
2135 if (MLD_V1_SEEN(ma->idev)) {
2136 if (ma->mca_flags & MAF_LAST_REPORTER)
2137 igmp6_send(&ma->mca_addr, ma->idev->dev,
2138 ICMPV6_MGM_REDUCTION);
2139 } else {
2140 mld_add_delrec(ma->idev, ma);
2141 mld_ifc_event(ma->idev);
2142 }
2143 }
2144
2145 static void mld_gq_timer_expire(unsigned long data)
2146 {
2147 struct inet6_dev *idev = (struct inet6_dev *)data;
2148
2149 idev->mc_gq_running = 0;
2150 mld_send_report(idev, NULL);
2151 __in6_dev_put(idev);
2152 }
2153
2154 static void mld_ifc_timer_expire(unsigned long data)
2155 {
2156 struct inet6_dev *idev = (struct inet6_dev *)data;
2157
2158 mld_send_cr(idev);
2159 if (idev->mc_ifc_count) {
2160 idev->mc_ifc_count--;
2161 if (idev->mc_ifc_count)
2162 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2163 }
2164 __in6_dev_put(idev);
2165 }
2166
2167 static void mld_ifc_event(struct inet6_dev *idev)
2168 {
2169 if (MLD_V1_SEEN(idev))
2170 return;
2171 idev->mc_ifc_count = idev->mc_qrv;
2172 mld_ifc_start_timer(idev, 1);
2173 }
2174
2175
2176 static void igmp6_timer_handler(unsigned long data)
2177 {
2178 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2179
2180 if (MLD_V1_SEEN(ma->idev))
2181 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2182 else
2183 mld_send_report(ma->idev, ma);
2184
2185 spin_lock(&ma->mca_lock);
2186 ma->mca_flags |= MAF_LAST_REPORTER;
2187 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2188 spin_unlock(&ma->mca_lock);
2189 ma_put(ma);
2190 }
2191
2192 /* Device changing type */
2193
2194 void ipv6_mc_unmap(struct inet6_dev *idev)
2195 {
2196 struct ifmcaddr6 *i;
2197
2198 /* Install multicast list, except for all-nodes (already installed) */
2199
2200 read_lock_bh(&idev->lock);
2201 for (i = idev->mc_list; i; i = i->next)
2202 igmp6_group_dropped(i);
2203 read_unlock_bh(&idev->lock);
2204 }
2205
2206 void ipv6_mc_remap(struct inet6_dev *idev)
2207 {
2208 ipv6_mc_up(idev);
2209 }
2210
2211 /* Device going down */
2212
2213 void ipv6_mc_down(struct inet6_dev *idev)
2214 {
2215 struct ifmcaddr6 *i;
2216
2217 /* Withdraw multicast list */
2218
2219 read_lock_bh(&idev->lock);
2220 idev->mc_ifc_count = 0;
2221 if (del_timer(&idev->mc_ifc_timer))
2222 __in6_dev_put(idev);
2223 idev->mc_gq_running = 0;
2224 if (del_timer(&idev->mc_gq_timer))
2225 __in6_dev_put(idev);
2226
2227 for (i = idev->mc_list; i; i=i->next)
2228 igmp6_group_dropped(i);
2229 read_unlock_bh(&idev->lock);
2230
2231 mld_clear_delrec(idev);
2232 }
2233
2234
2235 /* Device going up */
2236
2237 void ipv6_mc_up(struct inet6_dev *idev)
2238 {
2239 struct ifmcaddr6 *i;
2240
2241 /* Install multicast list, except for all-nodes (already installed) */
2242
2243 read_lock_bh(&idev->lock);
2244 for (i = idev->mc_list; i; i=i->next)
2245 igmp6_group_added(i);
2246 read_unlock_bh(&idev->lock);
2247 }
2248
2249 /* IPv6 device initialization. */
2250
2251 void ipv6_mc_init_dev(struct inet6_dev *idev)
2252 {
2253 write_lock_bh(&idev->lock);
2254 spin_lock_init(&idev->mc_lock);
2255 idev->mc_gq_running = 0;
2256 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2257 (unsigned long)idev);
2258 idev->mc_tomb = NULL;
2259 idev->mc_ifc_count = 0;
2260 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2261 (unsigned long)idev);
2262 idev->mc_qrv = MLD_QRV_DEFAULT;
2263 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2264 idev->mc_v1_seen = 0;
2265 write_unlock_bh(&idev->lock);
2266 }
2267
2268 /*
2269 * Device is about to be destroyed: clean up.
2270 */
2271
2272 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2273 {
2274 struct ifmcaddr6 *i;
2275
2276 /* Deactivate timers */
2277 ipv6_mc_down(idev);
2278
2279 /* Delete all-nodes address. */
2280 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2281 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2282 * fail.
2283 */
2284 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2285
2286 if (idev->cnf.forwarding)
2287 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2288
2289 write_lock_bh(&idev->lock);
2290 while ((i = idev->mc_list) != NULL) {
2291 idev->mc_list = i->next;
2292 write_unlock_bh(&idev->lock);
2293
2294 igmp6_group_dropped(i);
2295 ma_put(i);
2296
2297 write_lock_bh(&idev->lock);
2298 }
2299 write_unlock_bh(&idev->lock);
2300 }
2301
2302 #ifdef CONFIG_PROC_FS
2303 struct igmp6_mc_iter_state {
2304 struct seq_net_private p;
2305 struct net_device *dev;
2306 struct inet6_dev *idev;
2307 };
2308
2309 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2310
2311 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2312 {
2313 struct ifmcaddr6 *im = NULL;
2314 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2315 struct net *net = seq_file_net(seq);
2316
2317 state->idev = NULL;
2318 for_each_netdev_rcu(net, state->dev) {
2319 struct inet6_dev *idev;
2320 idev = __in6_dev_get(state->dev);
2321 if (!idev)
2322 continue;
2323 read_lock_bh(&idev->lock);
2324 im = idev->mc_list;
2325 if (im) {
2326 state->idev = idev;
2327 break;
2328 }
2329 read_unlock_bh(&idev->lock);
2330 }
2331 return im;
2332 }
2333
2334 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2335 {
2336 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2337
2338 im = im->next;
2339 while (!im) {
2340 if (likely(state->idev != NULL))
2341 read_unlock_bh(&state->idev->lock);
2342
2343 state->dev = next_net_device_rcu(state->dev);
2344 if (!state->dev) {
2345 state->idev = NULL;
2346 break;
2347 }
2348 state->idev = __in6_dev_get(state->dev);
2349 if (!state->idev)
2350 continue;
2351 read_lock_bh(&state->idev->lock);
2352 im = state->idev->mc_list;
2353 }
2354 return im;
2355 }
2356
2357 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2358 {
2359 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2360 if (im)
2361 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2362 --pos;
2363 return pos ? NULL : im;
2364 }
2365
2366 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2367 __acquires(RCU)
2368 {
2369 rcu_read_lock();
2370 return igmp6_mc_get_idx(seq, *pos);
2371 }
2372
2373 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2374 {
2375 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2376
2377 ++*pos;
2378 return im;
2379 }
2380
2381 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2382 __releases(RCU)
2383 {
2384 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2385
2386 if (likely(state->idev != NULL)) {
2387 read_unlock_bh(&state->idev->lock);
2388 state->idev = NULL;
2389 }
2390 state->dev = NULL;
2391 rcu_read_unlock();
2392 }
2393
2394 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2395 {
2396 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2397 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2398
2399 seq_printf(seq,
2400 "%-4d %-15s %pi6 %5d %08X %ld\n",
2401 state->dev->ifindex, state->dev->name,
2402 &im->mca_addr,
2403 im->mca_users, im->mca_flags,
2404 (im->mca_flags&MAF_TIMER_RUNNING) ?
2405 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2406 return 0;
2407 }
2408
2409 static const struct seq_operations igmp6_mc_seq_ops = {
2410 .start = igmp6_mc_seq_start,
2411 .next = igmp6_mc_seq_next,
2412 .stop = igmp6_mc_seq_stop,
2413 .show = igmp6_mc_seq_show,
2414 };
2415
2416 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2417 {
2418 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2419 sizeof(struct igmp6_mc_iter_state));
2420 }
2421
2422 static const struct file_operations igmp6_mc_seq_fops = {
2423 .owner = THIS_MODULE,
2424 .open = igmp6_mc_seq_open,
2425 .read = seq_read,
2426 .llseek = seq_lseek,
2427 .release = seq_release_net,
2428 };
2429
2430 struct igmp6_mcf_iter_state {
2431 struct seq_net_private p;
2432 struct net_device *dev;
2433 struct inet6_dev *idev;
2434 struct ifmcaddr6 *im;
2435 };
2436
2437 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2438
2439 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2440 {
2441 struct ip6_sf_list *psf = NULL;
2442 struct ifmcaddr6 *im = NULL;
2443 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2444 struct net *net = seq_file_net(seq);
2445
2446 state->idev = NULL;
2447 state->im = NULL;
2448 for_each_netdev_rcu(net, state->dev) {
2449 struct inet6_dev *idev;
2450 idev = __in6_dev_get(state->dev);
2451 if (unlikely(idev == NULL))
2452 continue;
2453 read_lock_bh(&idev->lock);
2454 im = idev->mc_list;
2455 if (likely(im != NULL)) {
2456 spin_lock_bh(&im->mca_lock);
2457 psf = im->mca_sources;
2458 if (likely(psf != NULL)) {
2459 state->im = im;
2460 state->idev = idev;
2461 break;
2462 }
2463 spin_unlock_bh(&im->mca_lock);
2464 }
2465 read_unlock_bh(&idev->lock);
2466 }
2467 return psf;
2468 }
2469
2470 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2471 {
2472 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2473
2474 psf = psf->sf_next;
2475 while (!psf) {
2476 spin_unlock_bh(&state->im->mca_lock);
2477 state->im = state->im->next;
2478 while (!state->im) {
2479 if (likely(state->idev != NULL))
2480 read_unlock_bh(&state->idev->lock);
2481
2482 state->dev = next_net_device_rcu(state->dev);
2483 if (!state->dev) {
2484 state->idev = NULL;
2485 goto out;
2486 }
2487 state->idev = __in6_dev_get(state->dev);
2488 if (!state->idev)
2489 continue;
2490 read_lock_bh(&state->idev->lock);
2491 state->im = state->idev->mc_list;
2492 }
2493 if (!state->im)
2494 break;
2495 spin_lock_bh(&state->im->mca_lock);
2496 psf = state->im->mca_sources;
2497 }
2498 out:
2499 return psf;
2500 }
2501
2502 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2503 {
2504 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2505 if (psf)
2506 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2507 --pos;
2508 return pos ? NULL : psf;
2509 }
2510
2511 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2512 __acquires(RCU)
2513 {
2514 rcu_read_lock();
2515 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2516 }
2517
2518 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2519 {
2520 struct ip6_sf_list *psf;
2521 if (v == SEQ_START_TOKEN)
2522 psf = igmp6_mcf_get_first(seq);
2523 else
2524 psf = igmp6_mcf_get_next(seq, v);
2525 ++*pos;
2526 return psf;
2527 }
2528
2529 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2530 __releases(RCU)
2531 {
2532 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2533 if (likely(state->im != NULL)) {
2534 spin_unlock_bh(&state->im->mca_lock);
2535 state->im = NULL;
2536 }
2537 if (likely(state->idev != NULL)) {
2538 read_unlock_bh(&state->idev->lock);
2539 state->idev = NULL;
2540 }
2541 state->dev = NULL;
2542 rcu_read_unlock();
2543 }
2544
2545 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2546 {
2547 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2548 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2549
2550 if (v == SEQ_START_TOKEN) {
2551 seq_printf(seq,
2552 "%3s %6s "
2553 "%32s %32s %6s %6s\n", "Idx",
2554 "Device", "Multicast Address",
2555 "Source Address", "INC", "EXC");
2556 } else {
2557 seq_printf(seq,
2558 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2559 state->dev->ifindex, state->dev->name,
2560 &state->im->mca_addr,
2561 &psf->sf_addr,
2562 psf->sf_count[MCAST_INCLUDE],
2563 psf->sf_count[MCAST_EXCLUDE]);
2564 }
2565 return 0;
2566 }
2567
2568 static const struct seq_operations igmp6_mcf_seq_ops = {
2569 .start = igmp6_mcf_seq_start,
2570 .next = igmp6_mcf_seq_next,
2571 .stop = igmp6_mcf_seq_stop,
2572 .show = igmp6_mcf_seq_show,
2573 };
2574
2575 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2576 {
2577 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2578 sizeof(struct igmp6_mcf_iter_state));
2579 }
2580
2581 static const struct file_operations igmp6_mcf_seq_fops = {
2582 .owner = THIS_MODULE,
2583 .open = igmp6_mcf_seq_open,
2584 .read = seq_read,
2585 .llseek = seq_lseek,
2586 .release = seq_release_net,
2587 };
2588
2589 static int __net_init igmp6_proc_init(struct net *net)
2590 {
2591 int err;
2592
2593 err = -ENOMEM;
2594 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2595 goto out;
2596 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2597 &igmp6_mcf_seq_fops))
2598 goto out_proc_net_igmp6;
2599
2600 err = 0;
2601 out:
2602 return err;
2603
2604 out_proc_net_igmp6:
2605 proc_net_remove(net, "igmp6");
2606 goto out;
2607 }
2608
2609 static void __net_exit igmp6_proc_exit(struct net *net)
2610 {
2611 proc_net_remove(net, "mcfilter6");
2612 proc_net_remove(net, "igmp6");
2613 }
2614 #else
2615 static inline int igmp6_proc_init(struct net *net)
2616 {
2617 return 0;
2618 }
2619 static inline void igmp6_proc_exit(struct net *net)
2620 {
2621 }
2622 #endif
2623
2624 static int __net_init igmp6_net_init(struct net *net)
2625 {
2626 int err;
2627
2628 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2629 SOCK_RAW, IPPROTO_ICMPV6, net);
2630 if (err < 0) {
2631 printk(KERN_ERR
2632 "Failed to initialize the IGMP6 control socket (err %d).\n",
2633 err);
2634 goto out;
2635 }
2636
2637 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2638
2639 err = igmp6_proc_init(net);
2640 if (err)
2641 goto out_sock_create;
2642 out:
2643 return err;
2644
2645 out_sock_create:
2646 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2647 goto out;
2648 }
2649
2650 static void __net_exit igmp6_net_exit(struct net *net)
2651 {
2652 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2653 igmp6_proc_exit(net);
2654 }
2655
2656 static struct pernet_operations igmp6_net_ops = {
2657 .init = igmp6_net_init,
2658 .exit = igmp6_net_exit,
2659 };
2660
2661 int __init igmp6_init(void)
2662 {
2663 return register_pernet_subsys(&igmp6_net_ops);
2664 }
2665
2666 void igmp6_cleanup(void)
2667 {
2668 unregister_pernet_subsys(&igmp6_net_ops);
2669 }
linux-next