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Linux 3.9-rc4
[linux-2.6/cjktty.git] / net / ipv6 / mcast.c
blobbfa6cc36ef2ab33e6e2894e03bb07c50f56a5804
1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <net/mld.h>
48
49 #include <linux/netfilter.h>
50 #include <linux/netfilter_ipv6.h>
51
52 #include <net/net_namespace.h>
53 #include <net/sock.h>
54 #include <net/snmp.h>
55
56 #include <net/ipv6.h>
57 #include <net/protocol.h>
58 #include <net/if_inet6.h>
59 #include <net/ndisc.h>
60 #include <net/addrconf.h>
61 #include <net/ip6_route.h>
62 #include <net/inet_common.h>
63
64 #include <net/ip6_checksum.h>
65
66 /* Set to 3 to get tracing... */
67 #define MCAST_DEBUG 2
68
69 #if MCAST_DEBUG >= 3
70 #define MDBG(x) printk x
71 #else
72 #define MDBG(x)
73 #endif
74
75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
77 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
80 };
81
82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
83
84 /* Big mc list lock for all the sockets */
85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
86
87 static void igmp6_join_group(struct ifmcaddr6 *ma);
88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
89 static void igmp6_timer_handler(unsigned long data);
90
91 static void mld_gq_timer_expire(unsigned long data);
92 static void mld_ifc_timer_expire(unsigned long data);
93 static void mld_ifc_event(struct inet6_dev *idev);
94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
96 static void mld_clear_delrec(struct inet6_dev *idev);
97 static int sf_setstate(struct ifmcaddr6 *pmc);
98 static void sf_markstate(struct ifmcaddr6 *pmc);
99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
101 int sfmode, int sfcount, const struct in6_addr *psfsrc,
102 int delta);
103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
104 int sfmode, int sfcount, const struct in6_addr *psfsrc,
105 int delta);
106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107 struct inet6_dev *idev);
108
109
110 #define IGMP6_UNSOLICITED_IVAL (10*HZ)
111 #define MLD_QRV_DEFAULT 2
112
113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
114 (idev)->cnf.force_mld_version == 1 || \
115 ((idev)->mc_v1_seen && \
116 time_before(jiffies, (idev)->mc_v1_seen)))
117
118 #define IPV6_MLD_MAX_MSF 64
119
120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
121
122 /*
123 * socket join on multicast group
124 */
125
126 #define for_each_pmc_rcu(np, pmc) \
127 for (pmc = rcu_dereference(np->ipv6_mc_list); \
128 pmc != NULL; \
129 pmc = rcu_dereference(pmc->next))
130
131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
132 {
133 struct net_device *dev = NULL;
134 struct ipv6_mc_socklist *mc_lst;
135 struct ipv6_pinfo *np = inet6_sk(sk);
136 struct net *net = sock_net(sk);
137 int err;
138
139 if (!ipv6_addr_is_multicast(addr))
140 return -EINVAL;
141
142 rcu_read_lock();
143 for_each_pmc_rcu(np, mc_lst) {
144 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145 ipv6_addr_equal(&mc_lst->addr, addr)) {
146 rcu_read_unlock();
147 return -EADDRINUSE;
148 }
149 }
150 rcu_read_unlock();
151
152 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
153
154 if (mc_lst == NULL)
155 return -ENOMEM;
156
157 mc_lst->next = NULL;
158 mc_lst->addr = *addr;
159
160 rcu_read_lock();
161 if (ifindex == 0) {
162 struct rt6_info *rt;
163 rt = rt6_lookup(net, addr, NULL, 0, 0);
164 if (rt) {
165 dev = rt->dst.dev;
166 ip6_rt_put(rt);
167 }
168 } else
169 dev = dev_get_by_index_rcu(net, ifindex);
170
171 if (dev == NULL) {
172 rcu_read_unlock();
173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174 return -ENODEV;
175 }
176
177 mc_lst->ifindex = dev->ifindex;
178 mc_lst->sfmode = MCAST_EXCLUDE;
179 rwlock_init(&mc_lst->sflock);
180 mc_lst->sflist = NULL;
181
182 /*
183 * now add/increase the group membership on the device
184 */
185
186 err = ipv6_dev_mc_inc(dev, addr);
187
188 if (err) {
189 rcu_read_unlock();
190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191 return err;
192 }
193
194 spin_lock(&ipv6_sk_mc_lock);
195 mc_lst->next = np->ipv6_mc_list;
196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 spin_unlock(&ipv6_sk_mc_lock);
198
199 rcu_read_unlock();
200
201 return 0;
202 }
203
204 /*
205 * socket leave on multicast group
206 */
207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 {
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct ipv6_mc_socklist *mc_lst;
211 struct ipv6_mc_socklist __rcu **lnk;
212 struct net *net = sock_net(sk);
213
214 if (!ipv6_addr_is_multicast(addr))
215 return -EINVAL;
216
217 spin_lock(&ipv6_sk_mc_lock);
218 for (lnk = &np->ipv6_mc_list;
219 (mc_lst = rcu_dereference_protected(*lnk,
220 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
221 lnk = &mc_lst->next) {
222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223 ipv6_addr_equal(&mc_lst->addr, addr)) {
224 struct net_device *dev;
225
226 *lnk = mc_lst->next;
227 spin_unlock(&ipv6_sk_mc_lock);
228
229 rcu_read_lock();
230 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
231 if (dev != NULL) {
232 struct inet6_dev *idev = __in6_dev_get(dev);
233
234 (void) ip6_mc_leave_src(sk, mc_lst, idev);
235 if (idev)
236 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
237 } else
238 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
239 rcu_read_unlock();
240 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
241 kfree_rcu(mc_lst, rcu);
242 return 0;
243 }
244 }
245 spin_unlock(&ipv6_sk_mc_lock);
246
247 return -EADDRNOTAVAIL;
248 }
249
250 /* called with rcu_read_lock() */
251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
252 const struct in6_addr *group,
253 int ifindex)
254 {
255 struct net_device *dev = NULL;
256 struct inet6_dev *idev = NULL;
257
258 if (ifindex == 0) {
259 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
260
261 if (rt) {
262 dev = rt->dst.dev;
263 ip6_rt_put(rt);
264 }
265 } else
266 dev = dev_get_by_index_rcu(net, ifindex);
267
268 if (!dev)
269 return NULL;
270 idev = __in6_dev_get(dev);
271 if (!idev)
272 return NULL;
273 read_lock_bh(&idev->lock);
274 if (idev->dead) {
275 read_unlock_bh(&idev->lock);
276 return NULL;
277 }
278 return idev;
279 }
280
281 void ipv6_sock_mc_close(struct sock *sk)
282 {
283 struct ipv6_pinfo *np = inet6_sk(sk);
284 struct ipv6_mc_socklist *mc_lst;
285 struct net *net = sock_net(sk);
286
287 if (!rcu_access_pointer(np->ipv6_mc_list))
288 return;
289
290 spin_lock(&ipv6_sk_mc_lock);
291 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
292 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
293 struct net_device *dev;
294
295 np->ipv6_mc_list = mc_lst->next;
296 spin_unlock(&ipv6_sk_mc_lock);
297
298 rcu_read_lock();
299 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
300 if (dev) {
301 struct inet6_dev *idev = __in6_dev_get(dev);
302
303 (void) ip6_mc_leave_src(sk, mc_lst, idev);
304 if (idev)
305 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
306 } else
307 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
308 rcu_read_unlock();
309
310 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
311 kfree_rcu(mc_lst, rcu);
312
313 spin_lock(&ipv6_sk_mc_lock);
314 }
315 spin_unlock(&ipv6_sk_mc_lock);
316 }
317
318 int ip6_mc_source(int add, int omode, struct sock *sk,
319 struct group_source_req *pgsr)
320 {
321 struct in6_addr *source, *group;
322 struct ipv6_mc_socklist *pmc;
323 struct inet6_dev *idev;
324 struct ipv6_pinfo *inet6 = inet6_sk(sk);
325 struct ip6_sf_socklist *psl;
326 struct net *net = sock_net(sk);
327 int i, j, rv;
328 int leavegroup = 0;
329 int pmclocked = 0;
330 int err;
331
332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
334
335 if (!ipv6_addr_is_multicast(group))
336 return -EINVAL;
337
338 rcu_read_lock();
339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
340 if (!idev) {
341 rcu_read_unlock();
342 return -ENODEV;
343 }
344
345 err = -EADDRNOTAVAIL;
346
347 for_each_pmc_rcu(inet6, pmc) {
348 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
349 continue;
350 if (ipv6_addr_equal(&pmc->addr, group))
351 break;
352 }
353 if (!pmc) { /* must have a prior join */
354 err = -EINVAL;
355 goto done;
356 }
357 /* if a source filter was set, must be the same mode as before */
358 if (pmc->sflist) {
359 if (pmc->sfmode != omode) {
360 err = -EINVAL;
361 goto done;
362 }
363 } else if (pmc->sfmode != omode) {
364 /* allow mode switches for empty-set filters */
365 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
366 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
367 pmc->sfmode = omode;
368 }
369
370 write_lock(&pmc->sflock);
371 pmclocked = 1;
372
373 psl = pmc->sflist;
374 if (!add) {
375 if (!psl)
376 goto done; /* err = -EADDRNOTAVAIL */
377 rv = !0;
378 for (i=0; i<psl->sl_count; i++) {
379 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
380 if (rv == 0)
381 break;
382 }
383 if (rv) /* source not found */
384 goto done; /* err = -EADDRNOTAVAIL */
385
386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
388 leavegroup = 1;
389 goto done;
390 }
391
392 /* update the interface filter */
393 ip6_mc_del_src(idev, group, omode, 1, source, 1);
394
395 for (j=i+1; j<psl->sl_count; j++)
396 psl->sl_addr[j-1] = psl->sl_addr[j];
397 psl->sl_count--;
398 err = 0;
399 goto done;
400 }
401 /* else, add a new source to the filter */
402
403 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
404 err = -ENOBUFS;
405 goto done;
406 }
407 if (!psl || psl->sl_count == psl->sl_max) {
408 struct ip6_sf_socklist *newpsl;
409 int count = IP6_SFBLOCK;
410
411 if (psl)
412 count += psl->sl_max;
413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
414 if (!newpsl) {
415 err = -ENOBUFS;
416 goto done;
417 }
418 newpsl->sl_max = count;
419 newpsl->sl_count = count - IP6_SFBLOCK;
420 if (psl) {
421 for (i=0; i<psl->sl_count; i++)
422 newpsl->sl_addr[i] = psl->sl_addr[i];
423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
424 }
425 pmc->sflist = psl = newpsl;
426 }
427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
428 for (i=0; i<psl->sl_count; i++) {
429 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
430 if (rv == 0) /* There is an error in the address. */
431 goto done;
432 }
433 for (j=psl->sl_count-1; j>=i; j--)
434 psl->sl_addr[j+1] = psl->sl_addr[j];
435 psl->sl_addr[i] = *source;
436 psl->sl_count++;
437 err = 0;
438 /* update the interface list */
439 ip6_mc_add_src(idev, group, omode, 1, source, 1);
440 done:
441 if (pmclocked)
442 write_unlock(&pmc->sflock);
443 read_unlock_bh(&idev->lock);
444 rcu_read_unlock();
445 if (leavegroup)
446 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
447 return err;
448 }
449
450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
451 {
452 const struct in6_addr *group;
453 struct ipv6_mc_socklist *pmc;
454 struct inet6_dev *idev;
455 struct ipv6_pinfo *inet6 = inet6_sk(sk);
456 struct ip6_sf_socklist *newpsl, *psl;
457 struct net *net = sock_net(sk);
458 int leavegroup = 0;
459 int i, err;
460
461 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
462
463 if (!ipv6_addr_is_multicast(group))
464 return -EINVAL;
465 if (gsf->gf_fmode != MCAST_INCLUDE &&
466 gsf->gf_fmode != MCAST_EXCLUDE)
467 return -EINVAL;
468
469 rcu_read_lock();
470 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
471
472 if (!idev) {
473 rcu_read_unlock();
474 return -ENODEV;
475 }
476
477 err = 0;
478
479 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
480 leavegroup = 1;
481 goto done;
482 }
483
484 for_each_pmc_rcu(inet6, pmc) {
485 if (pmc->ifindex != gsf->gf_interface)
486 continue;
487 if (ipv6_addr_equal(&pmc->addr, group))
488 break;
489 }
490 if (!pmc) { /* must have a prior join */
491 err = -EINVAL;
492 goto done;
493 }
494 if (gsf->gf_numsrc) {
495 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
496 GFP_ATOMIC);
497 if (!newpsl) {
498 err = -ENOBUFS;
499 goto done;
500 }
501 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
502 for (i=0; i<newpsl->sl_count; ++i) {
503 struct sockaddr_in6 *psin6;
504
505 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
506 newpsl->sl_addr[i] = psin6->sin6_addr;
507 }
508 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
509 newpsl->sl_count, newpsl->sl_addr, 0);
510 if (err) {
511 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
512 goto done;
513 }
514 } else {
515 newpsl = NULL;
516 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
517 }
518
519 write_lock(&pmc->sflock);
520 psl = pmc->sflist;
521 if (psl) {
522 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
523 psl->sl_count, psl->sl_addr, 0);
524 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
525 } else
526 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
527 pmc->sflist = newpsl;
528 pmc->sfmode = gsf->gf_fmode;
529 write_unlock(&pmc->sflock);
530 err = 0;
531 done:
532 read_unlock_bh(&idev->lock);
533 rcu_read_unlock();
534 if (leavegroup)
535 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
536 return err;
537 }
538
539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
540 struct group_filter __user *optval, int __user *optlen)
541 {
542 int err, i, count, copycount;
543 const struct in6_addr *group;
544 struct ipv6_mc_socklist *pmc;
545 struct inet6_dev *idev;
546 struct ipv6_pinfo *inet6 = inet6_sk(sk);
547 struct ip6_sf_socklist *psl;
548 struct net *net = sock_net(sk);
549
550 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
551
552 if (!ipv6_addr_is_multicast(group))
553 return -EINVAL;
554
555 rcu_read_lock();
556 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
557
558 if (!idev) {
559 rcu_read_unlock();
560 return -ENODEV;
561 }
562
563 err = -EADDRNOTAVAIL;
564 /*
565 * changes to the ipv6_mc_list require the socket lock and
566 * a read lock on ip6_sk_mc_lock. We have the socket lock,
567 * so reading the list is safe.
568 */
569
570 for_each_pmc_rcu(inet6, pmc) {
571 if (pmc->ifindex != gsf->gf_interface)
572 continue;
573 if (ipv6_addr_equal(group, &pmc->addr))
574 break;
575 }
576 if (!pmc) /* must have a prior join */
577 goto done;
578 gsf->gf_fmode = pmc->sfmode;
579 psl = pmc->sflist;
580 count = psl ? psl->sl_count : 0;
581 read_unlock_bh(&idev->lock);
582 rcu_read_unlock();
583
584 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
585 gsf->gf_numsrc = count;
586 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
587 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
588 return -EFAULT;
589 }
590 /* changes to psl require the socket lock, a read lock on
591 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
592 * have the socket lock, so reading here is safe.
593 */
594 for (i=0; i<copycount; i++) {
595 struct sockaddr_in6 *psin6;
596 struct sockaddr_storage ss;
597
598 psin6 = (struct sockaddr_in6 *)&ss;
599 memset(&ss, 0, sizeof(ss));
600 psin6->sin6_family = AF_INET6;
601 psin6->sin6_addr = psl->sl_addr[i];
602 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
603 return -EFAULT;
604 }
605 return 0;
606 done:
607 read_unlock_bh(&idev->lock);
608 rcu_read_unlock();
609 return err;
610 }
611
612 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
613 const struct in6_addr *src_addr)
614 {
615 struct ipv6_pinfo *np = inet6_sk(sk);
616 struct ipv6_mc_socklist *mc;
617 struct ip6_sf_socklist *psl;
618 bool rv = true;
619
620 rcu_read_lock();
621 for_each_pmc_rcu(np, mc) {
622 if (ipv6_addr_equal(&mc->addr, mc_addr))
623 break;
624 }
625 if (!mc) {
626 rcu_read_unlock();
627 return true;
628 }
629 read_lock(&mc->sflock);
630 psl = mc->sflist;
631 if (!psl) {
632 rv = mc->sfmode == MCAST_EXCLUDE;
633 } else {
634 int i;
635
636 for (i=0; i<psl->sl_count; i++) {
637 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
638 break;
639 }
640 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
641 rv = false;
642 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
643 rv = false;
644 }
645 read_unlock(&mc->sflock);
646 rcu_read_unlock();
647
648 return rv;
649 }
650
651 static void ma_put(struct ifmcaddr6 *mc)
652 {
653 if (atomic_dec_and_test(&mc->mca_refcnt)) {
654 in6_dev_put(mc->idev);
655 kfree(mc);
656 }
657 }
658
659 static void igmp6_group_added(struct ifmcaddr6 *mc)
660 {
661 struct net_device *dev = mc->idev->dev;
662 char buf[MAX_ADDR_LEN];
663
664 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
665 IPV6_ADDR_SCOPE_LINKLOCAL)
666 return;
667
668 spin_lock_bh(&mc->mca_lock);
669 if (!(mc->mca_flags&MAF_LOADED)) {
670 mc->mca_flags |= MAF_LOADED;
671 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
672 dev_mc_add(dev, buf);
673 }
674 spin_unlock_bh(&mc->mca_lock);
675
676 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
677 return;
678
679 if (MLD_V1_SEEN(mc->idev)) {
680 igmp6_join_group(mc);
681 return;
682 }
683 /* else v2 */
684
685 mc->mca_crcount = mc->idev->mc_qrv;
686 mld_ifc_event(mc->idev);
687 }
688
689 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
690 {
691 struct net_device *dev = mc->idev->dev;
692 char buf[MAX_ADDR_LEN];
693
694 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
695 IPV6_ADDR_SCOPE_LINKLOCAL)
696 return;
697
698 spin_lock_bh(&mc->mca_lock);
699 if (mc->mca_flags&MAF_LOADED) {
700 mc->mca_flags &= ~MAF_LOADED;
701 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
702 dev_mc_del(dev, buf);
703 }
704
705 if (mc->mca_flags & MAF_NOREPORT)
706 goto done;
707 spin_unlock_bh(&mc->mca_lock);
708
709 if (!mc->idev->dead)
710 igmp6_leave_group(mc);
711
712 spin_lock_bh(&mc->mca_lock);
713 if (del_timer(&mc->mca_timer))
714 atomic_dec(&mc->mca_refcnt);
715 done:
716 ip6_mc_clear_src(mc);
717 spin_unlock_bh(&mc->mca_lock);
718 }
719
720 /*
721 * deleted ifmcaddr6 manipulation
722 */
723 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
724 {
725 struct ifmcaddr6 *pmc;
726
727 /* this is an "ifmcaddr6" for convenience; only the fields below
728 * are actually used. In particular, the refcnt and users are not
729 * used for management of the delete list. Using the same structure
730 * for deleted items allows change reports to use common code with
731 * non-deleted or query-response MCA's.
732 */
733 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
734 if (!pmc)
735 return;
736
737 spin_lock_bh(&im->mca_lock);
738 spin_lock_init(&pmc->mca_lock);
739 pmc->idev = im->idev;
740 in6_dev_hold(idev);
741 pmc->mca_addr = im->mca_addr;
742 pmc->mca_crcount = idev->mc_qrv;
743 pmc->mca_sfmode = im->mca_sfmode;
744 if (pmc->mca_sfmode == MCAST_INCLUDE) {
745 struct ip6_sf_list *psf;
746
747 pmc->mca_tomb = im->mca_tomb;
748 pmc->mca_sources = im->mca_sources;
749 im->mca_tomb = im->mca_sources = NULL;
750 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
751 psf->sf_crcount = pmc->mca_crcount;
752 }
753 spin_unlock_bh(&im->mca_lock);
754
755 spin_lock_bh(&idev->mc_lock);
756 pmc->next = idev->mc_tomb;
757 idev->mc_tomb = pmc;
758 spin_unlock_bh(&idev->mc_lock);
759 }
760
761 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
762 {
763 struct ifmcaddr6 *pmc, *pmc_prev;
764 struct ip6_sf_list *psf, *psf_next;
765
766 spin_lock_bh(&idev->mc_lock);
767 pmc_prev = NULL;
768 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
769 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
770 break;
771 pmc_prev = pmc;
772 }
773 if (pmc) {
774 if (pmc_prev)
775 pmc_prev->next = pmc->next;
776 else
777 idev->mc_tomb = pmc->next;
778 }
779 spin_unlock_bh(&idev->mc_lock);
780
781 if (pmc) {
782 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
783 psf_next = psf->sf_next;
784 kfree(psf);
785 }
786 in6_dev_put(pmc->idev);
787 kfree(pmc);
788 }
789 }
790
791 static void mld_clear_delrec(struct inet6_dev *idev)
792 {
793 struct ifmcaddr6 *pmc, *nextpmc;
794
795 spin_lock_bh(&idev->mc_lock);
796 pmc = idev->mc_tomb;
797 idev->mc_tomb = NULL;
798 spin_unlock_bh(&idev->mc_lock);
799
800 for (; pmc; pmc = nextpmc) {
801 nextpmc = pmc->next;
802 ip6_mc_clear_src(pmc);
803 in6_dev_put(pmc->idev);
804 kfree(pmc);
805 }
806
807 /* clear dead sources, too */
808 read_lock_bh(&idev->lock);
809 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
810 struct ip6_sf_list *psf, *psf_next;
811
812 spin_lock_bh(&pmc->mca_lock);
813 psf = pmc->mca_tomb;
814 pmc->mca_tomb = NULL;
815 spin_unlock_bh(&pmc->mca_lock);
816 for (; psf; psf=psf_next) {
817 psf_next = psf->sf_next;
818 kfree(psf);
819 }
820 }
821 read_unlock_bh(&idev->lock);
822 }
823
824
825 /*
826 * device multicast group inc (add if not found)
827 */
828 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
829 {
830 struct ifmcaddr6 *mc;
831 struct inet6_dev *idev;
832
833 /* we need to take a reference on idev */
834 idev = in6_dev_get(dev);
835
836 if (idev == NULL)
837 return -EINVAL;
838
839 write_lock_bh(&idev->lock);
840 if (idev->dead) {
841 write_unlock_bh(&idev->lock);
842 in6_dev_put(idev);
843 return -ENODEV;
844 }
845
846 for (mc = idev->mc_list; mc; mc = mc->next) {
847 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
848 mc->mca_users++;
849 write_unlock_bh(&idev->lock);
850 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
851 NULL, 0);
852 in6_dev_put(idev);
853 return 0;
854 }
855 }
856
857 /*
858 * not found: create a new one.
859 */
860
861 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
862
863 if (mc == NULL) {
864 write_unlock_bh(&idev->lock);
865 in6_dev_put(idev);
866 return -ENOMEM;
867 }
868
869 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
870
871 mc->mca_addr = *addr;
872 mc->idev = idev; /* (reference taken) */
873 mc->mca_users = 1;
874 /* mca_stamp should be updated upon changes */
875 mc->mca_cstamp = mc->mca_tstamp = jiffies;
876 atomic_set(&mc->mca_refcnt, 2);
877 spin_lock_init(&mc->mca_lock);
878
879 /* initial mode is (EX, empty) */
880 mc->mca_sfmode = MCAST_EXCLUDE;
881 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
882
883 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
884 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
885 mc->mca_flags |= MAF_NOREPORT;
886
887 mc->next = idev->mc_list;
888 idev->mc_list = mc;
889 write_unlock_bh(&idev->lock);
890
891 mld_del_delrec(idev, &mc->mca_addr);
892 igmp6_group_added(mc);
893 ma_put(mc);
894 return 0;
895 }
896
897 /*
898 * device multicast group del
899 */
900 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
901 {
902 struct ifmcaddr6 *ma, **map;
903
904 write_lock_bh(&idev->lock);
905 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
906 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
907 if (--ma->mca_users == 0) {
908 *map = ma->next;
909 write_unlock_bh(&idev->lock);
910
911 igmp6_group_dropped(ma);
912
913 ma_put(ma);
914 return 0;
915 }
916 write_unlock_bh(&idev->lock);
917 return 0;
918 }
919 }
920 write_unlock_bh(&idev->lock);
921
922 return -ENOENT;
923 }
924
925 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
926 {
927 struct inet6_dev *idev;
928 int err;
929
930 rcu_read_lock();
931
932 idev = __in6_dev_get(dev);
933 if (!idev)
934 err = -ENODEV;
935 else
936 err = __ipv6_dev_mc_dec(idev, addr);
937
938 rcu_read_unlock();
939 return err;
940 }
941
942 /*
943 * check if the interface/address pair is valid
944 */
945 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
946 const struct in6_addr *src_addr)
947 {
948 struct inet6_dev *idev;
949 struct ifmcaddr6 *mc;
950 bool rv = false;
951
952 rcu_read_lock();
953 idev = __in6_dev_get(dev);
954 if (idev) {
955 read_lock_bh(&idev->lock);
956 for (mc = idev->mc_list; mc; mc=mc->next) {
957 if (ipv6_addr_equal(&mc->mca_addr, group))
958 break;
959 }
960 if (mc) {
961 if (src_addr && !ipv6_addr_any(src_addr)) {
962 struct ip6_sf_list *psf;
963
964 spin_lock_bh(&mc->mca_lock);
965 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
966 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
967 break;
968 }
969 if (psf)
970 rv = psf->sf_count[MCAST_INCLUDE] ||
971 psf->sf_count[MCAST_EXCLUDE] !=
972 mc->mca_sfcount[MCAST_EXCLUDE];
973 else
974 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
975 spin_unlock_bh(&mc->mca_lock);
976 } else
977 rv = true; /* don't filter unspecified source */
978 }
979 read_unlock_bh(&idev->lock);
980 }
981 rcu_read_unlock();
982 return rv;
983 }
984
985 static void mld_gq_start_timer(struct inet6_dev *idev)
986 {
987 int tv = net_random() % idev->mc_maxdelay;
988
989 idev->mc_gq_running = 1;
990 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
991 in6_dev_hold(idev);
992 }
993
994 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
995 {
996 int tv = net_random() % delay;
997
998 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
999 in6_dev_hold(idev);
1000 }
1001
1002 /*
1003 * IGMP handling (alias multicast ICMPv6 messages)
1004 */
1005
1006 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1007 {
1008 unsigned long delay = resptime;
1009
1010 /* Do not start timer for these addresses */
1011 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1012 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1013 return;
1014
1015 if (del_timer(&ma->mca_timer)) {
1016 atomic_dec(&ma->mca_refcnt);
1017 delay = ma->mca_timer.expires - jiffies;
1018 }
1019
1020 if (delay >= resptime) {
1021 if (resptime)
1022 delay = net_random() % resptime;
1023 else
1024 delay = 1;
1025 }
1026 ma->mca_timer.expires = jiffies + delay;
1027 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1028 atomic_inc(&ma->mca_refcnt);
1029 ma->mca_flags |= MAF_TIMER_RUNNING;
1030 }
1031
1032 /* mark EXCLUDE-mode sources */
1033 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1034 const struct in6_addr *srcs)
1035 {
1036 struct ip6_sf_list *psf;
1037 int i, scount;
1038
1039 scount = 0;
1040 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1041 if (scount == nsrcs)
1042 break;
1043 for (i=0; i<nsrcs; i++) {
1044 /* skip inactive filters */
1045 if (psf->sf_count[MCAST_INCLUDE] ||
1046 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1047 psf->sf_count[MCAST_EXCLUDE])
1048 break;
1049 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1050 scount++;
1051 break;
1052 }
1053 }
1054 }
1055 pmc->mca_flags &= ~MAF_GSQUERY;
1056 if (scount == nsrcs) /* all sources excluded */
1057 return false;
1058 return true;
1059 }
1060
1061 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1062 const struct in6_addr *srcs)
1063 {
1064 struct ip6_sf_list *psf;
1065 int i, scount;
1066
1067 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1068 return mld_xmarksources(pmc, nsrcs, srcs);
1069
1070 /* mark INCLUDE-mode sources */
1071
1072 scount = 0;
1073 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1074 if (scount == nsrcs)
1075 break;
1076 for (i=0; i<nsrcs; i++) {
1077 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1078 psf->sf_gsresp = 1;
1079 scount++;
1080 break;
1081 }
1082 }
1083 }
1084 if (!scount) {
1085 pmc->mca_flags &= ~MAF_GSQUERY;
1086 return false;
1087 }
1088 pmc->mca_flags |= MAF_GSQUERY;
1089 return true;
1090 }
1091
1092 /* called with rcu_read_lock() */
1093 int igmp6_event_query(struct sk_buff *skb)
1094 {
1095 struct mld2_query *mlh2 = NULL;
1096 struct ifmcaddr6 *ma;
1097 const struct in6_addr *group;
1098 unsigned long max_delay;
1099 struct inet6_dev *idev;
1100 struct mld_msg *mld;
1101 int group_type;
1102 int mark = 0;
1103 int len;
1104
1105 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1106 return -EINVAL;
1107
1108 /* compute payload length excluding extension headers */
1109 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1110 len -= skb_network_header_len(skb);
1111
1112 /* Drop queries with not link local source */
1113 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1114 return -EINVAL;
1115
1116 idev = __in6_dev_get(skb->dev);
1117
1118 if (idev == NULL)
1119 return 0;
1120
1121 mld = (struct mld_msg *)icmp6_hdr(skb);
1122 group = &mld->mld_mca;
1123 group_type = ipv6_addr_type(group);
1124
1125 if (group_type != IPV6_ADDR_ANY &&
1126 !(group_type&IPV6_ADDR_MULTICAST))
1127 return -EINVAL;
1128
1129 if (len == 24) {
1130 int switchback;
1131 /* MLDv1 router present */
1132
1133 /* Translate milliseconds to jiffies */
1134 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1135
1136 switchback = (idev->mc_qrv + 1) * max_delay;
1137 idev->mc_v1_seen = jiffies + switchback;
1138
1139 /* cancel the interface change timer */
1140 idev->mc_ifc_count = 0;
1141 if (del_timer(&idev->mc_ifc_timer))
1142 __in6_dev_put(idev);
1143 /* clear deleted report items */
1144 mld_clear_delrec(idev);
1145 } else if (len >= 28) {
1146 int srcs_offset = sizeof(struct mld2_query) -
1147 sizeof(struct icmp6hdr);
1148 if (!pskb_may_pull(skb, srcs_offset))
1149 return -EINVAL;
1150
1151 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1152 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1153 if (!max_delay)
1154 max_delay = 1;
1155 idev->mc_maxdelay = max_delay;
1156 if (mlh2->mld2q_qrv)
1157 idev->mc_qrv = mlh2->mld2q_qrv;
1158 if (group_type == IPV6_ADDR_ANY) { /* general query */
1159 if (mlh2->mld2q_nsrcs)
1160 return -EINVAL; /* no sources allowed */
1161
1162 mld_gq_start_timer(idev);
1163 return 0;
1164 }
1165 /* mark sources to include, if group & source-specific */
1166 if (mlh2->mld2q_nsrcs != 0) {
1167 if (!pskb_may_pull(skb, srcs_offset +
1168 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1169 return -EINVAL;
1170
1171 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1172 mark = 1;
1173 }
1174 } else
1175 return -EINVAL;
1176
1177 read_lock_bh(&idev->lock);
1178 if (group_type == IPV6_ADDR_ANY) {
1179 for (ma = idev->mc_list; ma; ma=ma->next) {
1180 spin_lock_bh(&ma->mca_lock);
1181 igmp6_group_queried(ma, max_delay);
1182 spin_unlock_bh(&ma->mca_lock);
1183 }
1184 } else {
1185 for (ma = idev->mc_list; ma; ma=ma->next) {
1186 if (!ipv6_addr_equal(group, &ma->mca_addr))
1187 continue;
1188 spin_lock_bh(&ma->mca_lock);
1189 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1190 /* gsquery <- gsquery && mark */
1191 if (!mark)
1192 ma->mca_flags &= ~MAF_GSQUERY;
1193 } else {
1194 /* gsquery <- mark */
1195 if (mark)
1196 ma->mca_flags |= MAF_GSQUERY;
1197 else
1198 ma->mca_flags &= ~MAF_GSQUERY;
1199 }
1200 if (!(ma->mca_flags & MAF_GSQUERY) ||
1201 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1202 igmp6_group_queried(ma, max_delay);
1203 spin_unlock_bh(&ma->mca_lock);
1204 break;
1205 }
1206 }
1207 read_unlock_bh(&idev->lock);
1208
1209 return 0;
1210 }
1211
1212 /* called with rcu_read_lock() */
1213 int igmp6_event_report(struct sk_buff *skb)
1214 {
1215 struct ifmcaddr6 *ma;
1216 struct inet6_dev *idev;
1217 struct mld_msg *mld;
1218 int addr_type;
1219
1220 /* Our own report looped back. Ignore it. */
1221 if (skb->pkt_type == PACKET_LOOPBACK)
1222 return 0;
1223
1224 /* send our report if the MC router may not have heard this report */
1225 if (skb->pkt_type != PACKET_MULTICAST &&
1226 skb->pkt_type != PACKET_BROADCAST)
1227 return 0;
1228
1229 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1230 return -EINVAL;
1231
1232 mld = (struct mld_msg *)icmp6_hdr(skb);
1233
1234 /* Drop reports with not link local source */
1235 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1236 if (addr_type != IPV6_ADDR_ANY &&
1237 !(addr_type&IPV6_ADDR_LINKLOCAL))
1238 return -EINVAL;
1239
1240 idev = __in6_dev_get(skb->dev);
1241 if (idev == NULL)
1242 return -ENODEV;
1243
1244 /*
1245 * Cancel the timer for this group
1246 */
1247
1248 read_lock_bh(&idev->lock);
1249 for (ma = idev->mc_list; ma; ma=ma->next) {
1250 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1251 spin_lock(&ma->mca_lock);
1252 if (del_timer(&ma->mca_timer))
1253 atomic_dec(&ma->mca_refcnt);
1254 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1255 spin_unlock(&ma->mca_lock);
1256 break;
1257 }
1258 }
1259 read_unlock_bh(&idev->lock);
1260 return 0;
1261 }
1262
1263 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1264 int gdeleted, int sdeleted)
1265 {
1266 switch (type) {
1267 case MLD2_MODE_IS_INCLUDE:
1268 case MLD2_MODE_IS_EXCLUDE:
1269 if (gdeleted || sdeleted)
1270 return false;
1271 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1272 if (pmc->mca_sfmode == MCAST_INCLUDE)
1273 return true;
1274 /* don't include if this source is excluded
1275 * in all filters
1276 */
1277 if (psf->sf_count[MCAST_INCLUDE])
1278 return type == MLD2_MODE_IS_INCLUDE;
1279 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1280 psf->sf_count[MCAST_EXCLUDE];
1281 }
1282 return false;
1283 case MLD2_CHANGE_TO_INCLUDE:
1284 if (gdeleted || sdeleted)
1285 return false;
1286 return psf->sf_count[MCAST_INCLUDE] != 0;
1287 case MLD2_CHANGE_TO_EXCLUDE:
1288 if (gdeleted || sdeleted)
1289 return false;
1290 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1291 psf->sf_count[MCAST_INCLUDE])
1292 return false;
1293 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1294 psf->sf_count[MCAST_EXCLUDE];
1295 case MLD2_ALLOW_NEW_SOURCES:
1296 if (gdeleted || !psf->sf_crcount)
1297 return false;
1298 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1299 case MLD2_BLOCK_OLD_SOURCES:
1300 if (pmc->mca_sfmode == MCAST_INCLUDE)
1301 return gdeleted || (psf->sf_crcount && sdeleted);
1302 return psf->sf_crcount && !gdeleted && !sdeleted;
1303 }
1304 return false;
1305 }
1306
1307 static int
1308 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1309 {
1310 struct ip6_sf_list *psf;
1311 int scount = 0;
1312
1313 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1314 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1315 continue;
1316 scount++;
1317 }
1318 return scount;
1319 }
1320
1321 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1322 struct net_device *dev,
1323 const struct in6_addr *saddr,
1324 const struct in6_addr *daddr,
1325 int proto, int len)
1326 {
1327 struct ipv6hdr *hdr;
1328
1329 skb->protocol = htons(ETH_P_IPV6);
1330 skb->dev = dev;
1331
1332 skb_reset_network_header(skb);
1333 skb_put(skb, sizeof(struct ipv6hdr));
1334 hdr = ipv6_hdr(skb);
1335
1336 ip6_flow_hdr(hdr, 0, 0);
1337
1338 hdr->payload_len = htons(len);
1339 hdr->nexthdr = proto;
1340 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1341
1342 hdr->saddr = *saddr;
1343 hdr->daddr = *daddr;
1344 }
1345
1346 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1347 {
1348 struct net *net = dev_net(dev);
1349 struct sock *sk = net->ipv6.igmp_sk;
1350 struct sk_buff *skb;
1351 struct mld2_report *pmr;
1352 struct in6_addr addr_buf;
1353 const struct in6_addr *saddr;
1354 int hlen = LL_RESERVED_SPACE(dev);
1355 int tlen = dev->needed_tailroom;
1356 int err;
1357 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1358 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1359 IPV6_TLV_PADN, 0 };
1360
1361 /* we assume size > sizeof(ra) here */
1362 size += hlen + tlen;
1363 /* limit our allocations to order-0 page */
1364 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1365 skb = sock_alloc_send_skb(sk, size, 1, &err);
1366
1367 if (!skb)
1368 return NULL;
1369
1370 skb_reserve(skb, hlen);
1371
1372 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1373 /* <draft-ietf-magma-mld-source-05.txt>:
1374 * use unspecified address as the source address
1375 * when a valid link-local address is not available.
1376 */
1377 saddr = &in6addr_any;
1378 } else
1379 saddr = &addr_buf;
1380
1381 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1382
1383 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1384
1385 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1386 skb_put(skb, sizeof(*pmr));
1387 pmr = (struct mld2_report *)skb_transport_header(skb);
1388 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1389 pmr->mld2r_resv1 = 0;
1390 pmr->mld2r_cksum = 0;
1391 pmr->mld2r_resv2 = 0;
1392 pmr->mld2r_ngrec = 0;
1393 return skb;
1394 }
1395
1396 static void mld_sendpack(struct sk_buff *skb)
1397 {
1398 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1399 struct mld2_report *pmr =
1400 (struct mld2_report *)skb_transport_header(skb);
1401 int payload_len, mldlen;
1402 struct inet6_dev *idev;
1403 struct net *net = dev_net(skb->dev);
1404 int err;
1405 struct flowi6 fl6;
1406 struct dst_entry *dst;
1407
1408 rcu_read_lock();
1409 idev = __in6_dev_get(skb->dev);
1410 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1411
1412 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1413 mldlen = skb->tail - skb->transport_header;
1414 pip6->payload_len = htons(payload_len);
1415
1416 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1417 IPPROTO_ICMPV6,
1418 csum_partial(skb_transport_header(skb),
1419 mldlen, 0));
1420
1421 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1422 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1423 skb->dev->ifindex);
1424 dst = icmp6_dst_alloc(skb->dev, &fl6);
1425
1426 err = 0;
1427 if (IS_ERR(dst)) {
1428 err = PTR_ERR(dst);
1429 dst = NULL;
1430 }
1431 skb_dst_set(skb, dst);
1432 if (err)
1433 goto err_out;
1434
1435 payload_len = skb->len;
1436
1437 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1438 dst_output);
1439 out:
1440 if (!err) {
1441 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1442 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1443 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1444 } else
1445 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1446
1447 rcu_read_unlock();
1448 return;
1449
1450 err_out:
1451 kfree_skb(skb);
1452 goto out;
1453 }
1454
1455 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1456 {
1457 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1458 }
1459
1460 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1461 int type, struct mld2_grec **ppgr)
1462 {
1463 struct net_device *dev = pmc->idev->dev;
1464 struct mld2_report *pmr;
1465 struct mld2_grec *pgr;
1466
1467 if (!skb)
1468 skb = mld_newpack(dev, dev->mtu);
1469 if (!skb)
1470 return NULL;
1471 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1472 pgr->grec_type = type;
1473 pgr->grec_auxwords = 0;
1474 pgr->grec_nsrcs = 0;
1475 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1476 pmr = (struct mld2_report *)skb_transport_header(skb);
1477 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1478 *ppgr = pgr;
1479 return skb;
1480 }
1481
1482 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1483 skb_tailroom(skb)) : 0)
1484
1485 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1486 int type, int gdeleted, int sdeleted)
1487 {
1488 struct net_device *dev = pmc->idev->dev;
1489 struct mld2_report *pmr;
1490 struct mld2_grec *pgr = NULL;
1491 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1492 int scount, stotal, first, isquery, truncate;
1493
1494 if (pmc->mca_flags & MAF_NOREPORT)
1495 return skb;
1496
1497 isquery = type == MLD2_MODE_IS_INCLUDE ||
1498 type == MLD2_MODE_IS_EXCLUDE;
1499 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1500 type == MLD2_CHANGE_TO_EXCLUDE;
1501
1502 stotal = scount = 0;
1503
1504 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1505
1506 if (!*psf_list)
1507 goto empty_source;
1508
1509 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1510
1511 /* EX and TO_EX get a fresh packet, if needed */
1512 if (truncate) {
1513 if (pmr && pmr->mld2r_ngrec &&
1514 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1515 if (skb)
1516 mld_sendpack(skb);
1517 skb = mld_newpack(dev, dev->mtu);
1518 }
1519 }
1520 first = 1;
1521 psf_prev = NULL;
1522 for (psf=*psf_list; psf; psf=psf_next) {
1523 struct in6_addr *psrc;
1524
1525 psf_next = psf->sf_next;
1526
1527 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1528 psf_prev = psf;
1529 continue;
1530 }
1531
1532 /* clear marks on query responses */
1533 if (isquery)
1534 psf->sf_gsresp = 0;
1535
1536 if (AVAILABLE(skb) < sizeof(*psrc) +
1537 first*sizeof(struct mld2_grec)) {
1538 if (truncate && !first)
1539 break; /* truncate these */
1540 if (pgr)
1541 pgr->grec_nsrcs = htons(scount);
1542 if (skb)
1543 mld_sendpack(skb);
1544 skb = mld_newpack(dev, dev->mtu);
1545 first = 1;
1546 scount = 0;
1547 }
1548 if (first) {
1549 skb = add_grhead(skb, pmc, type, &pgr);
1550 first = 0;
1551 }
1552 if (!skb)
1553 return NULL;
1554 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1555 *psrc = psf->sf_addr;
1556 scount++; stotal++;
1557 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1558 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1559 psf->sf_crcount--;
1560 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1561 if (psf_prev)
1562 psf_prev->sf_next = psf->sf_next;
1563 else
1564 *psf_list = psf->sf_next;
1565 kfree(psf);
1566 continue;
1567 }
1568 }
1569 psf_prev = psf;
1570 }
1571
1572 empty_source:
1573 if (!stotal) {
1574 if (type == MLD2_ALLOW_NEW_SOURCES ||
1575 type == MLD2_BLOCK_OLD_SOURCES)
1576 return skb;
1577 if (pmc->mca_crcount || isquery) {
1578 /* make sure we have room for group header */
1579 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1580 mld_sendpack(skb);
1581 skb = NULL; /* add_grhead will get a new one */
1582 }
1583 skb = add_grhead(skb, pmc, type, &pgr);
1584 }
1585 }
1586 if (pgr)
1587 pgr->grec_nsrcs = htons(scount);
1588
1589 if (isquery)
1590 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1591 return skb;
1592 }
1593
1594 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1595 {
1596 struct sk_buff *skb = NULL;
1597 int type;
1598
1599 if (!pmc) {
1600 read_lock_bh(&idev->lock);
1601 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1602 if (pmc->mca_flags & MAF_NOREPORT)
1603 continue;
1604 spin_lock_bh(&pmc->mca_lock);
1605 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1606 type = MLD2_MODE_IS_EXCLUDE;
1607 else
1608 type = MLD2_MODE_IS_INCLUDE;
1609 skb = add_grec(skb, pmc, type, 0, 0);
1610 spin_unlock_bh(&pmc->mca_lock);
1611 }
1612 read_unlock_bh(&idev->lock);
1613 } else {
1614 spin_lock_bh(&pmc->mca_lock);
1615 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1616 type = MLD2_MODE_IS_EXCLUDE;
1617 else
1618 type = MLD2_MODE_IS_INCLUDE;
1619 skb = add_grec(skb, pmc, type, 0, 0);
1620 spin_unlock_bh(&pmc->mca_lock);
1621 }
1622 if (skb)
1623 mld_sendpack(skb);
1624 }
1625
1626 /*
1627 * remove zero-count source records from a source filter list
1628 */
1629 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1630 {
1631 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1632
1633 psf_prev = NULL;
1634 for (psf=*ppsf; psf; psf = psf_next) {
1635 psf_next = psf->sf_next;
1636 if (psf->sf_crcount == 0) {
1637 if (psf_prev)
1638 psf_prev->sf_next = psf->sf_next;
1639 else
1640 *ppsf = psf->sf_next;
1641 kfree(psf);
1642 } else
1643 psf_prev = psf;
1644 }
1645 }
1646
1647 static void mld_send_cr(struct inet6_dev *idev)
1648 {
1649 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1650 struct sk_buff *skb = NULL;
1651 int type, dtype;
1652
1653 read_lock_bh(&idev->lock);
1654 spin_lock(&idev->mc_lock);
1655
1656 /* deleted MCA's */
1657 pmc_prev = NULL;
1658 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1659 pmc_next = pmc->next;
1660 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1661 type = MLD2_BLOCK_OLD_SOURCES;
1662 dtype = MLD2_BLOCK_OLD_SOURCES;
1663 skb = add_grec(skb, pmc, type, 1, 0);
1664 skb = add_grec(skb, pmc, dtype, 1, 1);
1665 }
1666 if (pmc->mca_crcount) {
1667 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1668 type = MLD2_CHANGE_TO_INCLUDE;
1669 skb = add_grec(skb, pmc, type, 1, 0);
1670 }
1671 pmc->mca_crcount--;
1672 if (pmc->mca_crcount == 0) {
1673 mld_clear_zeros(&pmc->mca_tomb);
1674 mld_clear_zeros(&pmc->mca_sources);
1675 }
1676 }
1677 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1678 !pmc->mca_sources) {
1679 if (pmc_prev)
1680 pmc_prev->next = pmc_next;
1681 else
1682 idev->mc_tomb = pmc_next;
1683 in6_dev_put(pmc->idev);
1684 kfree(pmc);
1685 } else
1686 pmc_prev = pmc;
1687 }
1688 spin_unlock(&idev->mc_lock);
1689
1690 /* change recs */
1691 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1692 spin_lock_bh(&pmc->mca_lock);
1693 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1694 type = MLD2_BLOCK_OLD_SOURCES;
1695 dtype = MLD2_ALLOW_NEW_SOURCES;
1696 } else {
1697 type = MLD2_ALLOW_NEW_SOURCES;
1698 dtype = MLD2_BLOCK_OLD_SOURCES;
1699 }
1700 skb = add_grec(skb, pmc, type, 0, 0);
1701 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1702
1703 /* filter mode changes */
1704 if (pmc->mca_crcount) {
1705 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1706 type = MLD2_CHANGE_TO_EXCLUDE;
1707 else
1708 type = MLD2_CHANGE_TO_INCLUDE;
1709 skb = add_grec(skb, pmc, type, 0, 0);
1710 pmc->mca_crcount--;
1711 }
1712 spin_unlock_bh(&pmc->mca_lock);
1713 }
1714 read_unlock_bh(&idev->lock);
1715 if (!skb)
1716 return;
1717 (void) mld_sendpack(skb);
1718 }
1719
1720 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1721 {
1722 struct net *net = dev_net(dev);
1723 struct sock *sk = net->ipv6.igmp_sk;
1724 struct inet6_dev *idev;
1725 struct sk_buff *skb;
1726 struct mld_msg *hdr;
1727 const struct in6_addr *snd_addr, *saddr;
1728 struct in6_addr addr_buf;
1729 int hlen = LL_RESERVED_SPACE(dev);
1730 int tlen = dev->needed_tailroom;
1731 int err, len, payload_len, full_len;
1732 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1733 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1734 IPV6_TLV_PADN, 0 };
1735 struct flowi6 fl6;
1736 struct dst_entry *dst;
1737
1738 if (type == ICMPV6_MGM_REDUCTION)
1739 snd_addr = &in6addr_linklocal_allrouters;
1740 else
1741 snd_addr = addr;
1742
1743 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1744 payload_len = len + sizeof(ra);
1745 full_len = sizeof(struct ipv6hdr) + payload_len;
1746
1747 rcu_read_lock();
1748 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1749 IPSTATS_MIB_OUT, full_len);
1750 rcu_read_unlock();
1751
1752 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1753
1754 if (skb == NULL) {
1755 rcu_read_lock();
1756 IP6_INC_STATS(net, __in6_dev_get(dev),
1757 IPSTATS_MIB_OUTDISCARDS);
1758 rcu_read_unlock();
1759 return;
1760 }
1761
1762 skb_reserve(skb, hlen);
1763
1764 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1765 /* <draft-ietf-magma-mld-source-05.txt>:
1766 * use unspecified address as the source address
1767 * when a valid link-local address is not available.
1768 */
1769 saddr = &in6addr_any;
1770 } else
1771 saddr = &addr_buf;
1772
1773 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1774
1775 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1776
1777 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1778 memset(hdr, 0, sizeof(struct mld_msg));
1779 hdr->mld_type = type;
1780 hdr->mld_mca = *addr;
1781
1782 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1783 IPPROTO_ICMPV6,
1784 csum_partial(hdr, len, 0));
1785
1786 rcu_read_lock();
1787 idev = __in6_dev_get(skb->dev);
1788
1789 icmpv6_flow_init(sk, &fl6, type,
1790 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1791 skb->dev->ifindex);
1792 dst = icmp6_dst_alloc(skb->dev, &fl6);
1793 if (IS_ERR(dst)) {
1794 err = PTR_ERR(dst);
1795 goto err_out;
1796 }
1797
1798 skb_dst_set(skb, dst);
1799 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1800 dst_output);
1801 out:
1802 if (!err) {
1803 ICMP6MSGOUT_INC_STATS(net, idev, type);
1804 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1805 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1806 } else
1807 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1808
1809 rcu_read_unlock();
1810 return;
1811
1812 err_out:
1813 kfree_skb(skb);
1814 goto out;
1815 }
1816
1817 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1818 const struct in6_addr *psfsrc)
1819 {
1820 struct ip6_sf_list *psf, *psf_prev;
1821 int rv = 0;
1822
1823 psf_prev = NULL;
1824 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1825 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1826 break;
1827 psf_prev = psf;
1828 }
1829 if (!psf || psf->sf_count[sfmode] == 0) {
1830 /* source filter not found, or count wrong => bug */
1831 return -ESRCH;
1832 }
1833 psf->sf_count[sfmode]--;
1834 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1835 struct inet6_dev *idev = pmc->idev;
1836
1837 /* no more filters for this source */
1838 if (psf_prev)
1839 psf_prev->sf_next = psf->sf_next;
1840 else
1841 pmc->mca_sources = psf->sf_next;
1842 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1843 !MLD_V1_SEEN(idev)) {
1844 psf->sf_crcount = idev->mc_qrv;
1845 psf->sf_next = pmc->mca_tomb;
1846 pmc->mca_tomb = psf;
1847 rv = 1;
1848 } else
1849 kfree(psf);
1850 }
1851 return rv;
1852 }
1853
1854 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1855 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1856 int delta)
1857 {
1858 struct ifmcaddr6 *pmc;
1859 int changerec = 0;
1860 int i, err;
1861
1862 if (!idev)
1863 return -ENODEV;
1864 read_lock_bh(&idev->lock);
1865 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1866 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1867 break;
1868 }
1869 if (!pmc) {
1870 /* MCA not found?? bug */
1871 read_unlock_bh(&idev->lock);
1872 return -ESRCH;
1873 }
1874 spin_lock_bh(&pmc->mca_lock);
1875 sf_markstate(pmc);
1876 if (!delta) {
1877 if (!pmc->mca_sfcount[sfmode]) {
1878 spin_unlock_bh(&pmc->mca_lock);
1879 read_unlock_bh(&idev->lock);
1880 return -EINVAL;
1881 }
1882 pmc->mca_sfcount[sfmode]--;
1883 }
1884 err = 0;
1885 for (i=0; i<sfcount; i++) {
1886 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1887
1888 changerec |= rv > 0;
1889 if (!err && rv < 0)
1890 err = rv;
1891 }
1892 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1893 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1894 pmc->mca_sfcount[MCAST_INCLUDE]) {
1895 struct ip6_sf_list *psf;
1896
1897 /* filter mode change */
1898 pmc->mca_sfmode = MCAST_INCLUDE;
1899 pmc->mca_crcount = idev->mc_qrv;
1900 idev->mc_ifc_count = pmc->mca_crcount;
1901 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1902 psf->sf_crcount = 0;
1903 mld_ifc_event(pmc->idev);
1904 } else if (sf_setstate(pmc) || changerec)
1905 mld_ifc_event(pmc->idev);
1906 spin_unlock_bh(&pmc->mca_lock);
1907 read_unlock_bh(&idev->lock);
1908 return err;
1909 }
1910
1911 /*
1912 * Add multicast single-source filter to the interface list
1913 */
1914 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1915 const struct in6_addr *psfsrc)
1916 {
1917 struct ip6_sf_list *psf, *psf_prev;
1918
1919 psf_prev = NULL;
1920 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1921 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1922 break;
1923 psf_prev = psf;
1924 }
1925 if (!psf) {
1926 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1927 if (!psf)
1928 return -ENOBUFS;
1929
1930 psf->sf_addr = *psfsrc;
1931 if (psf_prev) {
1932 psf_prev->sf_next = psf;
1933 } else
1934 pmc->mca_sources = psf;
1935 }
1936 psf->sf_count[sfmode]++;
1937 return 0;
1938 }
1939
1940 static void sf_markstate(struct ifmcaddr6 *pmc)
1941 {
1942 struct ip6_sf_list *psf;
1943 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1944
1945 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1946 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1947 psf->sf_oldin = mca_xcount ==
1948 psf->sf_count[MCAST_EXCLUDE] &&
1949 !psf->sf_count[MCAST_INCLUDE];
1950 } else
1951 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1952 }
1953
1954 static int sf_setstate(struct ifmcaddr6 *pmc)
1955 {
1956 struct ip6_sf_list *psf, *dpsf;
1957 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1958 int qrv = pmc->idev->mc_qrv;
1959 int new_in, rv;
1960
1961 rv = 0;
1962 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1963 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1964 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1965 !psf->sf_count[MCAST_INCLUDE];
1966 } else
1967 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1968 if (new_in) {
1969 if (!psf->sf_oldin) {
1970 struct ip6_sf_list *prev = NULL;
1971
1972 for (dpsf=pmc->mca_tomb; dpsf;
1973 dpsf=dpsf->sf_next) {
1974 if (ipv6_addr_equal(&dpsf->sf_addr,
1975 &psf->sf_addr))
1976 break;
1977 prev = dpsf;
1978 }
1979 if (dpsf) {
1980 if (prev)
1981 prev->sf_next = dpsf->sf_next;
1982 else
1983 pmc->mca_tomb = dpsf->sf_next;
1984 kfree(dpsf);
1985 }
1986 psf->sf_crcount = qrv;
1987 rv++;
1988 }
1989 } else if (psf->sf_oldin) {
1990 psf->sf_crcount = 0;
1991 /*
1992 * add or update "delete" records if an active filter
1993 * is now inactive
1994 */
1995 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1996 if (ipv6_addr_equal(&dpsf->sf_addr,
1997 &psf->sf_addr))
1998 break;
1999 if (!dpsf) {
2000 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2001 if (!dpsf)
2002 continue;
2003 *dpsf = *psf;
2004 /* pmc->mca_lock held by callers */
2005 dpsf->sf_next = pmc->mca_tomb;
2006 pmc->mca_tomb = dpsf;
2007 }
2008 dpsf->sf_crcount = qrv;
2009 rv++;
2010 }
2011 }
2012 return rv;
2013 }
2014
2015 /*
2016 * Add multicast source filter list to the interface list
2017 */
2018 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2019 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2020 int delta)
2021 {
2022 struct ifmcaddr6 *pmc;
2023 int isexclude;
2024 int i, err;
2025
2026 if (!idev)
2027 return -ENODEV;
2028 read_lock_bh(&idev->lock);
2029 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2030 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2031 break;
2032 }
2033 if (!pmc) {
2034 /* MCA not found?? bug */
2035 read_unlock_bh(&idev->lock);
2036 return -ESRCH;
2037 }
2038 spin_lock_bh(&pmc->mca_lock);
2039
2040 sf_markstate(pmc);
2041 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2042 if (!delta)
2043 pmc->mca_sfcount[sfmode]++;
2044 err = 0;
2045 for (i=0; i<sfcount; i++) {
2046 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2047 if (err)
2048 break;
2049 }
2050 if (err) {
2051 int j;
2052
2053 if (!delta)
2054 pmc->mca_sfcount[sfmode]--;
2055 for (j=0; j<i; j++)
2056 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2057 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2058 struct ip6_sf_list *psf;
2059
2060 /* filter mode change */
2061 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2062 pmc->mca_sfmode = MCAST_EXCLUDE;
2063 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2064 pmc->mca_sfmode = MCAST_INCLUDE;
2065 /* else no filters; keep old mode for reports */
2066
2067 pmc->mca_crcount = idev->mc_qrv;
2068 idev->mc_ifc_count = pmc->mca_crcount;
2069 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2070 psf->sf_crcount = 0;
2071 mld_ifc_event(idev);
2072 } else if (sf_setstate(pmc))
2073 mld_ifc_event(idev);
2074 spin_unlock_bh(&pmc->mca_lock);
2075 read_unlock_bh(&idev->lock);
2076 return err;
2077 }
2078
2079 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2080 {
2081 struct ip6_sf_list *psf, *nextpsf;
2082
2083 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2084 nextpsf = psf->sf_next;
2085 kfree(psf);
2086 }
2087 pmc->mca_tomb = NULL;
2088 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2089 nextpsf = psf->sf_next;
2090 kfree(psf);
2091 }
2092 pmc->mca_sources = NULL;
2093 pmc->mca_sfmode = MCAST_EXCLUDE;
2094 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2095 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2096 }
2097
2098
2099 static void igmp6_join_group(struct ifmcaddr6 *ma)
2100 {
2101 unsigned long delay;
2102
2103 if (ma->mca_flags & MAF_NOREPORT)
2104 return;
2105
2106 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2107
2108 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2109
2110 spin_lock_bh(&ma->mca_lock);
2111 if (del_timer(&ma->mca_timer)) {
2112 atomic_dec(&ma->mca_refcnt);
2113 delay = ma->mca_timer.expires - jiffies;
2114 }
2115
2116 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2117 atomic_inc(&ma->mca_refcnt);
2118 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2119 spin_unlock_bh(&ma->mca_lock);
2120 }
2121
2122 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2123 struct inet6_dev *idev)
2124 {
2125 int err;
2126
2127 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2128 * so no other readers or writers of iml or its sflist
2129 */
2130 if (!iml->sflist) {
2131 /* any-source empty exclude case */
2132 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2133 }
2134 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2135 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2136 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2137 iml->sflist = NULL;
2138 return err;
2139 }
2140
2141 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2142 {
2143 if (MLD_V1_SEEN(ma->idev)) {
2144 if (ma->mca_flags & MAF_LAST_REPORTER)
2145 igmp6_send(&ma->mca_addr, ma->idev->dev,
2146 ICMPV6_MGM_REDUCTION);
2147 } else {
2148 mld_add_delrec(ma->idev, ma);
2149 mld_ifc_event(ma->idev);
2150 }
2151 }
2152
2153 static void mld_gq_timer_expire(unsigned long data)
2154 {
2155 struct inet6_dev *idev = (struct inet6_dev *)data;
2156
2157 idev->mc_gq_running = 0;
2158 mld_send_report(idev, NULL);
2159 __in6_dev_put(idev);
2160 }
2161
2162 static void mld_ifc_timer_expire(unsigned long data)
2163 {
2164 struct inet6_dev *idev = (struct inet6_dev *)data;
2165
2166 mld_send_cr(idev);
2167 if (idev->mc_ifc_count) {
2168 idev->mc_ifc_count--;
2169 if (idev->mc_ifc_count)
2170 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2171 }
2172 __in6_dev_put(idev);
2173 }
2174
2175 static void mld_ifc_event(struct inet6_dev *idev)
2176 {
2177 if (MLD_V1_SEEN(idev))
2178 return;
2179 idev->mc_ifc_count = idev->mc_qrv;
2180 mld_ifc_start_timer(idev, 1);
2181 }
2182
2183
2184 static void igmp6_timer_handler(unsigned long data)
2185 {
2186 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2187
2188 if (MLD_V1_SEEN(ma->idev))
2189 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2190 else
2191 mld_send_report(ma->idev, ma);
2192
2193 spin_lock(&ma->mca_lock);
2194 ma->mca_flags |= MAF_LAST_REPORTER;
2195 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2196 spin_unlock(&ma->mca_lock);
2197 ma_put(ma);
2198 }
2199
2200 /* Device changing type */
2201
2202 void ipv6_mc_unmap(struct inet6_dev *idev)
2203 {
2204 struct ifmcaddr6 *i;
2205
2206 /* Install multicast list, except for all-nodes (already installed) */
2207
2208 read_lock_bh(&idev->lock);
2209 for (i = idev->mc_list; i; i = i->next)
2210 igmp6_group_dropped(i);
2211 read_unlock_bh(&idev->lock);
2212 }
2213
2214 void ipv6_mc_remap(struct inet6_dev *idev)
2215 {
2216 ipv6_mc_up(idev);
2217 }
2218
2219 /* Device going down */
2220
2221 void ipv6_mc_down(struct inet6_dev *idev)
2222 {
2223 struct ifmcaddr6 *i;
2224
2225 /* Withdraw multicast list */
2226
2227 read_lock_bh(&idev->lock);
2228 idev->mc_ifc_count = 0;
2229 if (del_timer(&idev->mc_ifc_timer))
2230 __in6_dev_put(idev);
2231 idev->mc_gq_running = 0;
2232 if (del_timer(&idev->mc_gq_timer))
2233 __in6_dev_put(idev);
2234
2235 for (i = idev->mc_list; i; i=i->next)
2236 igmp6_group_dropped(i);
2237 read_unlock_bh(&idev->lock);
2238
2239 mld_clear_delrec(idev);
2240 }
2241
2242
2243 /* Device going up */
2244
2245 void ipv6_mc_up(struct inet6_dev *idev)
2246 {
2247 struct ifmcaddr6 *i;
2248
2249 /* Install multicast list, except for all-nodes (already installed) */
2250
2251 read_lock_bh(&idev->lock);
2252 for (i = idev->mc_list; i; i=i->next)
2253 igmp6_group_added(i);
2254 read_unlock_bh(&idev->lock);
2255 }
2256
2257 /* IPv6 device initialization. */
2258
2259 void ipv6_mc_init_dev(struct inet6_dev *idev)
2260 {
2261 write_lock_bh(&idev->lock);
2262 spin_lock_init(&idev->mc_lock);
2263 idev->mc_gq_running = 0;
2264 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2265 (unsigned long)idev);
2266 idev->mc_tomb = NULL;
2267 idev->mc_ifc_count = 0;
2268 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2269 (unsigned long)idev);
2270 idev->mc_qrv = MLD_QRV_DEFAULT;
2271 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2272 idev->mc_v1_seen = 0;
2273 write_unlock_bh(&idev->lock);
2274 }
2275
2276 /*
2277 * Device is about to be destroyed: clean up.
2278 */
2279
2280 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2281 {
2282 struct ifmcaddr6 *i;
2283
2284 /* Deactivate timers */
2285 ipv6_mc_down(idev);
2286
2287 /* Delete all-nodes address. */
2288 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2289 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2290 * fail.
2291 */
2292 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2293
2294 if (idev->cnf.forwarding)
2295 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2296
2297 write_lock_bh(&idev->lock);
2298 while ((i = idev->mc_list) != NULL) {
2299 idev->mc_list = i->next;
2300 write_unlock_bh(&idev->lock);
2301
2302 igmp6_group_dropped(i);
2303 ma_put(i);
2304
2305 write_lock_bh(&idev->lock);
2306 }
2307 write_unlock_bh(&idev->lock);
2308 }
2309
2310 #ifdef CONFIG_PROC_FS
2311 struct igmp6_mc_iter_state {
2312 struct seq_net_private p;
2313 struct net_device *dev;
2314 struct inet6_dev *idev;
2315 };
2316
2317 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2318
2319 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2320 {
2321 struct ifmcaddr6 *im = NULL;
2322 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2323 struct net *net = seq_file_net(seq);
2324
2325 state->idev = NULL;
2326 for_each_netdev_rcu(net, state->dev) {
2327 struct inet6_dev *idev;
2328 idev = __in6_dev_get(state->dev);
2329 if (!idev)
2330 continue;
2331 read_lock_bh(&idev->lock);
2332 im = idev->mc_list;
2333 if (im) {
2334 state->idev = idev;
2335 break;
2336 }
2337 read_unlock_bh(&idev->lock);
2338 }
2339 return im;
2340 }
2341
2342 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2343 {
2344 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2345
2346 im = im->next;
2347 while (!im) {
2348 if (likely(state->idev != NULL))
2349 read_unlock_bh(&state->idev->lock);
2350
2351 state->dev = next_net_device_rcu(state->dev);
2352 if (!state->dev) {
2353 state->idev = NULL;
2354 break;
2355 }
2356 state->idev = __in6_dev_get(state->dev);
2357 if (!state->idev)
2358 continue;
2359 read_lock_bh(&state->idev->lock);
2360 im = state->idev->mc_list;
2361 }
2362 return im;
2363 }
2364
2365 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2366 {
2367 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2368 if (im)
2369 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2370 --pos;
2371 return pos ? NULL : im;
2372 }
2373
2374 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2375 __acquires(RCU)
2376 {
2377 rcu_read_lock();
2378 return igmp6_mc_get_idx(seq, *pos);
2379 }
2380
2381 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2382 {
2383 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2384
2385 ++*pos;
2386 return im;
2387 }
2388
2389 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2390 __releases(RCU)
2391 {
2392 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2393
2394 if (likely(state->idev != NULL)) {
2395 read_unlock_bh(&state->idev->lock);
2396 state->idev = NULL;
2397 }
2398 state->dev = NULL;
2399 rcu_read_unlock();
2400 }
2401
2402 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2403 {
2404 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2405 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2406
2407 seq_printf(seq,
2408 "%-4d %-15s %pi6 %5d %08X %ld\n",
2409 state->dev->ifindex, state->dev->name,
2410 &im->mca_addr,
2411 im->mca_users, im->mca_flags,
2412 (im->mca_flags&MAF_TIMER_RUNNING) ?
2413 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2414 return 0;
2415 }
2416
2417 static const struct seq_operations igmp6_mc_seq_ops = {
2418 .start = igmp6_mc_seq_start,
2419 .next = igmp6_mc_seq_next,
2420 .stop = igmp6_mc_seq_stop,
2421 .show = igmp6_mc_seq_show,
2422 };
2423
2424 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2425 {
2426 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2427 sizeof(struct igmp6_mc_iter_state));
2428 }
2429
2430 static const struct file_operations igmp6_mc_seq_fops = {
2431 .owner = THIS_MODULE,
2432 .open = igmp6_mc_seq_open,
2433 .read = seq_read,
2434 .llseek = seq_lseek,
2435 .release = seq_release_net,
2436 };
2437
2438 struct igmp6_mcf_iter_state {
2439 struct seq_net_private p;
2440 struct net_device *dev;
2441 struct inet6_dev *idev;
2442 struct ifmcaddr6 *im;
2443 };
2444
2445 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2446
2447 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2448 {
2449 struct ip6_sf_list *psf = NULL;
2450 struct ifmcaddr6 *im = NULL;
2451 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2452 struct net *net = seq_file_net(seq);
2453
2454 state->idev = NULL;
2455 state->im = NULL;
2456 for_each_netdev_rcu(net, state->dev) {
2457 struct inet6_dev *idev;
2458 idev = __in6_dev_get(state->dev);
2459 if (unlikely(idev == NULL))
2460 continue;
2461 read_lock_bh(&idev->lock);
2462 im = idev->mc_list;
2463 if (likely(im != NULL)) {
2464 spin_lock_bh(&im->mca_lock);
2465 psf = im->mca_sources;
2466 if (likely(psf != NULL)) {
2467 state->im = im;
2468 state->idev = idev;
2469 break;
2470 }
2471 spin_unlock_bh(&im->mca_lock);
2472 }
2473 read_unlock_bh(&idev->lock);
2474 }
2475 return psf;
2476 }
2477
2478 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2479 {
2480 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2481
2482 psf = psf->sf_next;
2483 while (!psf) {
2484 spin_unlock_bh(&state->im->mca_lock);
2485 state->im = state->im->next;
2486 while (!state->im) {
2487 if (likely(state->idev != NULL))
2488 read_unlock_bh(&state->idev->lock);
2489
2490 state->dev = next_net_device_rcu(state->dev);
2491 if (!state->dev) {
2492 state->idev = NULL;
2493 goto out;
2494 }
2495 state->idev = __in6_dev_get(state->dev);
2496 if (!state->idev)
2497 continue;
2498 read_lock_bh(&state->idev->lock);
2499 state->im = state->idev->mc_list;
2500 }
2501 if (!state->im)
2502 break;
2503 spin_lock_bh(&state->im->mca_lock);
2504 psf = state->im->mca_sources;
2505 }
2506 out:
2507 return psf;
2508 }
2509
2510 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2511 {
2512 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2513 if (psf)
2514 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2515 --pos;
2516 return pos ? NULL : psf;
2517 }
2518
2519 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2520 __acquires(RCU)
2521 {
2522 rcu_read_lock();
2523 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2524 }
2525
2526 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2527 {
2528 struct ip6_sf_list *psf;
2529 if (v == SEQ_START_TOKEN)
2530 psf = igmp6_mcf_get_first(seq);
2531 else
2532 psf = igmp6_mcf_get_next(seq, v);
2533 ++*pos;
2534 return psf;
2535 }
2536
2537 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2538 __releases(RCU)
2539 {
2540 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2541 if (likely(state->im != NULL)) {
2542 spin_unlock_bh(&state->im->mca_lock);
2543 state->im = NULL;
2544 }
2545 if (likely(state->idev != NULL)) {
2546 read_unlock_bh(&state->idev->lock);
2547 state->idev = NULL;
2548 }
2549 state->dev = NULL;
2550 rcu_read_unlock();
2551 }
2552
2553 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2554 {
2555 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2556 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2557
2558 if (v == SEQ_START_TOKEN) {
2559 seq_printf(seq,
2560 "%3s %6s "
2561 "%32s %32s %6s %6s\n", "Idx",
2562 "Device", "Multicast Address",
2563 "Source Address", "INC", "EXC");
2564 } else {
2565 seq_printf(seq,
2566 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2567 state->dev->ifindex, state->dev->name,
2568 &state->im->mca_addr,
2569 &psf->sf_addr,
2570 psf->sf_count[MCAST_INCLUDE],
2571 psf->sf_count[MCAST_EXCLUDE]);
2572 }
2573 return 0;
2574 }
2575
2576 static const struct seq_operations igmp6_mcf_seq_ops = {
2577 .start = igmp6_mcf_seq_start,
2578 .next = igmp6_mcf_seq_next,
2579 .stop = igmp6_mcf_seq_stop,
2580 .show = igmp6_mcf_seq_show,
2581 };
2582
2583 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2584 {
2585 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2586 sizeof(struct igmp6_mcf_iter_state));
2587 }
2588
2589 static const struct file_operations igmp6_mcf_seq_fops = {
2590 .owner = THIS_MODULE,
2591 .open = igmp6_mcf_seq_open,
2592 .read = seq_read,
2593 .llseek = seq_lseek,
2594 .release = seq_release_net,
2595 };
2596
2597 static int __net_init igmp6_proc_init(struct net *net)
2598 {
2599 int err;
2600
2601 err = -ENOMEM;
2602 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2603 goto out;
2604 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2605 &igmp6_mcf_seq_fops))
2606 goto out_proc_net_igmp6;
2607
2608 err = 0;
2609 out:
2610 return err;
2611
2612 out_proc_net_igmp6:
2613 remove_proc_entry("igmp6", net->proc_net);
2614 goto out;
2615 }
2616
2617 static void __net_exit igmp6_proc_exit(struct net *net)
2618 {
2619 remove_proc_entry("mcfilter6", net->proc_net);
2620 remove_proc_entry("igmp6", net->proc_net);
2621 }
2622 #else
2623 static inline int igmp6_proc_init(struct net *net)
2624 {
2625 return 0;
2626 }
2627 static inline void igmp6_proc_exit(struct net *net)
2628 {
2629 }
2630 #endif
2631
2632 static int __net_init igmp6_net_init(struct net *net)
2633 {
2634 int err;
2635
2636 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2637 SOCK_RAW, IPPROTO_ICMPV6, net);
2638 if (err < 0) {
2639 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2640 err);
2641 goto out;
2642 }
2643
2644 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2645
2646 err = igmp6_proc_init(net);
2647 if (err)
2648 goto out_sock_create;
2649 out:
2650 return err;
2651
2652 out_sock_create:
2653 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2654 goto out;
2655 }
2656
2657 static void __net_exit igmp6_net_exit(struct net *net)
2658 {
2659 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2660 igmp6_proc_exit(net);
2661 }
2662
2663 static struct pernet_operations igmp6_net_ops = {
2664 .init = igmp6_net_init,
2665 .exit = igmp6_net_exit,
2666 };
2667
2668 int __init igmp6_init(void)
2669 {
2670 return register_pernet_subsys(&igmp6_net_ops);
2671 }
2672
2673 void igmp6_cleanup(void)
2674 {
2675 unregister_pernet_subsys(&igmp6_net_ops);
2676 }
CJK support for tty framebuffer vt