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Merge tag 'v3.10.94' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / mcast.c
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 inet6_dev *idev, int size)
1347 {
1348 struct net_device *dev = idev->dev;
1349 struct net *net = dev_net(dev);
1350 struct sock *sk = net->ipv6.igmp_sk;
1351 struct sk_buff *skb;
1352 struct mld2_report *pmr;
1353 struct in6_addr addr_buf;
1354 const struct in6_addr *saddr;
1355 int hlen = LL_RESERVED_SPACE(dev);
1356 int tlen = dev->needed_tailroom;
1357 int err;
1358 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1359 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1360 IPV6_TLV_PADN, 0 };
1361
1362 /* we assume size > sizeof(ra) here */
1363 size += hlen + tlen;
1364 /* limit our allocations to order-0 page */
1365 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1366 skb = sock_alloc_send_skb(sk, size, 1, &err);
1367
1368 if (!skb)
1369 return NULL;
1370
1371 skb_reserve(skb, hlen);
1372
1373 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1374 /* <draft-ietf-magma-mld-source-05.txt>:
1375 * use unspecified address as the source address
1376 * when a valid link-local address is not available.
1377 */
1378 saddr = &in6addr_any;
1379 } else
1380 saddr = &addr_buf;
1381
1382 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1383
1384 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1385
1386 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1387 skb_put(skb, sizeof(*pmr));
1388 pmr = (struct mld2_report *)skb_transport_header(skb);
1389 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1390 pmr->mld2r_resv1 = 0;
1391 pmr->mld2r_cksum = 0;
1392 pmr->mld2r_resv2 = 0;
1393 pmr->mld2r_ngrec = 0;
1394 return skb;
1395 }
1396
1397 static void mld_sendpack(struct sk_buff *skb)
1398 {
1399 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1400 struct mld2_report *pmr =
1401 (struct mld2_report *)skb_transport_header(skb);
1402 int payload_len, mldlen;
1403 struct inet6_dev *idev;
1404 struct net *net = dev_net(skb->dev);
1405 int err;
1406 struct flowi6 fl6;
1407 struct dst_entry *dst;
1408
1409 rcu_read_lock();
1410 idev = __in6_dev_get(skb->dev);
1411 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1412
1413 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1414 mldlen = skb->tail - skb->transport_header;
1415 pip6->payload_len = htons(payload_len);
1416
1417 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1418 IPPROTO_ICMPV6,
1419 csum_partial(skb_transport_header(skb),
1420 mldlen, 0));
1421
1422 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1423 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1424 skb->dev->ifindex);
1425 dst = icmp6_dst_alloc(skb->dev, &fl6);
1426
1427 err = 0;
1428 if (IS_ERR(dst)) {
1429 err = PTR_ERR(dst);
1430 dst = NULL;
1431 }
1432 skb_dst_set(skb, dst);
1433 if (err)
1434 goto err_out;
1435
1436 payload_len = skb->len;
1437
1438 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1439 dst_output);
1440 out:
1441 if (!err) {
1442 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1443 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1444 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1445 } else {
1446 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1447 }
1448
1449 rcu_read_unlock();
1450 return;
1451
1452 err_out:
1453 kfree_skb(skb);
1454 goto out;
1455 }
1456
1457 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1458 {
1459 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1460 }
1461
1462 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1463 int type, struct mld2_grec **ppgr)
1464 {
1465 struct net_device *dev = pmc->idev->dev;
1466 struct mld2_report *pmr;
1467 struct mld2_grec *pgr;
1468
1469 if (!skb)
1470 skb = mld_newpack(pmc->idev, dev->mtu);
1471 if (!skb)
1472 return NULL;
1473 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1474 pgr->grec_type = type;
1475 pgr->grec_auxwords = 0;
1476 pgr->grec_nsrcs = 0;
1477 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1478 pmr = (struct mld2_report *)skb_transport_header(skb);
1479 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1480 *ppgr = pgr;
1481 return skb;
1482 }
1483
1484 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1485 skb_tailroom(skb)) : 0)
1486
1487 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1488 int type, int gdeleted, int sdeleted)
1489 {
1490 struct inet6_dev *idev = pmc->idev;
1491 struct net_device *dev = idev->dev;
1492 struct mld2_report *pmr;
1493 struct mld2_grec *pgr = NULL;
1494 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1495 int scount, stotal, first, isquery, truncate;
1496
1497 if (pmc->mca_flags & MAF_NOREPORT)
1498 return skb;
1499
1500 isquery = type == MLD2_MODE_IS_INCLUDE ||
1501 type == MLD2_MODE_IS_EXCLUDE;
1502 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1503 type == MLD2_CHANGE_TO_EXCLUDE;
1504
1505 stotal = scount = 0;
1506
1507 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1508
1509 if (!*psf_list)
1510 goto empty_source;
1511
1512 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1513
1514 /* EX and TO_EX get a fresh packet, if needed */
1515 if (truncate) {
1516 if (pmr && pmr->mld2r_ngrec &&
1517 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1518 if (skb)
1519 mld_sendpack(skb);
1520 skb = mld_newpack(idev, dev->mtu);
1521 }
1522 }
1523 first = 1;
1524 psf_prev = NULL;
1525 for (psf=*psf_list; psf; psf=psf_next) {
1526 struct in6_addr *psrc;
1527
1528 psf_next = psf->sf_next;
1529
1530 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1531 psf_prev = psf;
1532 continue;
1533 }
1534
1535 /* clear marks on query responses */
1536 if (isquery)
1537 psf->sf_gsresp = 0;
1538
1539 if (AVAILABLE(skb) < sizeof(*psrc) +
1540 first*sizeof(struct mld2_grec)) {
1541 if (truncate && !first)
1542 break; /* truncate these */
1543 if (pgr)
1544 pgr->grec_nsrcs = htons(scount);
1545 if (skb)
1546 mld_sendpack(skb);
1547 skb = mld_newpack(idev, dev->mtu);
1548 first = 1;
1549 scount = 0;
1550 }
1551 if (first) {
1552 skb = add_grhead(skb, pmc, type, &pgr);
1553 first = 0;
1554 }
1555 if (!skb)
1556 return NULL;
1557 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1558 *psrc = psf->sf_addr;
1559 scount++; stotal++;
1560 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1561 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1562 psf->sf_crcount--;
1563 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1564 if (psf_prev)
1565 psf_prev->sf_next = psf->sf_next;
1566 else
1567 *psf_list = psf->sf_next;
1568 kfree(psf);
1569 continue;
1570 }
1571 }
1572 psf_prev = psf;
1573 }
1574
1575 empty_source:
1576 if (!stotal) {
1577 if (type == MLD2_ALLOW_NEW_SOURCES ||
1578 type == MLD2_BLOCK_OLD_SOURCES)
1579 return skb;
1580 if (pmc->mca_crcount || isquery) {
1581 /* make sure we have room for group header */
1582 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1583 mld_sendpack(skb);
1584 skb = NULL; /* add_grhead will get a new one */
1585 }
1586 skb = add_grhead(skb, pmc, type, &pgr);
1587 }
1588 }
1589 if (pgr)
1590 pgr->grec_nsrcs = htons(scount);
1591
1592 if (isquery)
1593 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1594 return skb;
1595 }
1596
1597 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1598 {
1599 struct sk_buff *skb = NULL;
1600 int type;
1601
1602 read_lock_bh(&idev->lock);
1603 if (!pmc) {
1604 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1605 if (pmc->mca_flags & MAF_NOREPORT)
1606 continue;
1607 spin_lock_bh(&pmc->mca_lock);
1608 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1609 type = MLD2_MODE_IS_EXCLUDE;
1610 else
1611 type = MLD2_MODE_IS_INCLUDE;
1612 skb = add_grec(skb, pmc, type, 0, 0);
1613 spin_unlock_bh(&pmc->mca_lock);
1614 }
1615 } else {
1616 spin_lock_bh(&pmc->mca_lock);
1617 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1618 type = MLD2_MODE_IS_EXCLUDE;
1619 else
1620 type = MLD2_MODE_IS_INCLUDE;
1621 skb = add_grec(skb, pmc, type, 0, 0);
1622 spin_unlock_bh(&pmc->mca_lock);
1623 }
1624 read_unlock_bh(&idev->lock);
1625 if (skb)
1626 mld_sendpack(skb);
1627 }
1628
1629 /*
1630 * remove zero-count source records from a source filter list
1631 */
1632 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1633 {
1634 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1635
1636 psf_prev = NULL;
1637 for (psf=*ppsf; psf; psf = psf_next) {
1638 psf_next = psf->sf_next;
1639 if (psf->sf_crcount == 0) {
1640 if (psf_prev)
1641 psf_prev->sf_next = psf->sf_next;
1642 else
1643 *ppsf = psf->sf_next;
1644 kfree(psf);
1645 } else
1646 psf_prev = psf;
1647 }
1648 }
1649
1650 static void mld_send_cr(struct inet6_dev *idev)
1651 {
1652 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1653 struct sk_buff *skb = NULL;
1654 int type, dtype;
1655
1656 read_lock_bh(&idev->lock);
1657 spin_lock(&idev->mc_lock);
1658
1659 /* deleted MCA's */
1660 pmc_prev = NULL;
1661 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1662 pmc_next = pmc->next;
1663 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1664 type = MLD2_BLOCK_OLD_SOURCES;
1665 dtype = MLD2_BLOCK_OLD_SOURCES;
1666 skb = add_grec(skb, pmc, type, 1, 0);
1667 skb = add_grec(skb, pmc, dtype, 1, 1);
1668 }
1669 if (pmc->mca_crcount) {
1670 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1671 type = MLD2_CHANGE_TO_INCLUDE;
1672 skb = add_grec(skb, pmc, type, 1, 0);
1673 }
1674 pmc->mca_crcount--;
1675 if (pmc->mca_crcount == 0) {
1676 mld_clear_zeros(&pmc->mca_tomb);
1677 mld_clear_zeros(&pmc->mca_sources);
1678 }
1679 }
1680 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1681 !pmc->mca_sources) {
1682 if (pmc_prev)
1683 pmc_prev->next = pmc_next;
1684 else
1685 idev->mc_tomb = pmc_next;
1686 in6_dev_put(pmc->idev);
1687 kfree(pmc);
1688 } else
1689 pmc_prev = pmc;
1690 }
1691 spin_unlock(&idev->mc_lock);
1692
1693 /* change recs */
1694 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1695 spin_lock_bh(&pmc->mca_lock);
1696 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1697 type = MLD2_BLOCK_OLD_SOURCES;
1698 dtype = MLD2_ALLOW_NEW_SOURCES;
1699 } else {
1700 type = MLD2_ALLOW_NEW_SOURCES;
1701 dtype = MLD2_BLOCK_OLD_SOURCES;
1702 }
1703 skb = add_grec(skb, pmc, type, 0, 0);
1704 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1705
1706 /* filter mode changes */
1707 if (pmc->mca_crcount) {
1708 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1709 type = MLD2_CHANGE_TO_EXCLUDE;
1710 else
1711 type = MLD2_CHANGE_TO_INCLUDE;
1712 skb = add_grec(skb, pmc, type, 0, 0);
1713 pmc->mca_crcount--;
1714 }
1715 spin_unlock_bh(&pmc->mca_lock);
1716 }
1717 read_unlock_bh(&idev->lock);
1718 if (!skb)
1719 return;
1720 (void) mld_sendpack(skb);
1721 }
1722
1723 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1724 {
1725 struct net *net = dev_net(dev);
1726 struct sock *sk = net->ipv6.igmp_sk;
1727 struct inet6_dev *idev;
1728 struct sk_buff *skb;
1729 struct mld_msg *hdr;
1730 const struct in6_addr *snd_addr, *saddr;
1731 struct in6_addr addr_buf;
1732 int hlen = LL_RESERVED_SPACE(dev);
1733 int tlen = dev->needed_tailroom;
1734 int err, len, payload_len, full_len;
1735 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1736 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1737 IPV6_TLV_PADN, 0 };
1738 struct flowi6 fl6;
1739 struct dst_entry *dst;
1740
1741 if (type == ICMPV6_MGM_REDUCTION)
1742 snd_addr = &in6addr_linklocal_allrouters;
1743 else
1744 snd_addr = addr;
1745
1746 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1747 payload_len = len + sizeof(ra);
1748 full_len = sizeof(struct ipv6hdr) + payload_len;
1749
1750 rcu_read_lock();
1751 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1752 IPSTATS_MIB_OUT, full_len);
1753 rcu_read_unlock();
1754
1755 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1756
1757 if (skb == NULL) {
1758 rcu_read_lock();
1759 IP6_INC_STATS(net, __in6_dev_get(dev),
1760 IPSTATS_MIB_OUTDISCARDS);
1761 rcu_read_unlock();
1762 return;
1763 }
1764
1765 skb_reserve(skb, hlen);
1766
1767 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1768 /* <draft-ietf-magma-mld-source-05.txt>:
1769 * use unspecified address as the source address
1770 * when a valid link-local address is not available.
1771 */
1772 saddr = &in6addr_any;
1773 } else
1774 saddr = &addr_buf;
1775
1776 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1777
1778 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1779
1780 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1781 memset(hdr, 0, sizeof(struct mld_msg));
1782 hdr->mld_type = type;
1783 hdr->mld_mca = *addr;
1784
1785 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1786 IPPROTO_ICMPV6,
1787 csum_partial(hdr, len, 0));
1788
1789 rcu_read_lock();
1790 idev = __in6_dev_get(skb->dev);
1791
1792 icmpv6_flow_init(sk, &fl6, type,
1793 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1794 skb->dev->ifindex);
1795 dst = icmp6_dst_alloc(skb->dev, &fl6);
1796 if (IS_ERR(dst)) {
1797 err = PTR_ERR(dst);
1798 goto err_out;
1799 }
1800
1801 skb_dst_set(skb, dst);
1802 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1803 dst_output);
1804 out:
1805 if (!err) {
1806 ICMP6MSGOUT_INC_STATS(net, idev, type);
1807 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1808 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1809 } else
1810 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1811
1812 rcu_read_unlock();
1813 return;
1814
1815 err_out:
1816 kfree_skb(skb);
1817 goto out;
1818 }
1819
1820 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1821 const struct in6_addr *psfsrc)
1822 {
1823 struct ip6_sf_list *psf, *psf_prev;
1824 int rv = 0;
1825
1826 psf_prev = NULL;
1827 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1828 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1829 break;
1830 psf_prev = psf;
1831 }
1832 if (!psf || psf->sf_count[sfmode] == 0) {
1833 /* source filter not found, or count wrong => bug */
1834 return -ESRCH;
1835 }
1836 psf->sf_count[sfmode]--;
1837 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1838 struct inet6_dev *idev = pmc->idev;
1839
1840 /* no more filters for this source */
1841 if (psf_prev)
1842 psf_prev->sf_next = psf->sf_next;
1843 else
1844 pmc->mca_sources = psf->sf_next;
1845 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1846 !MLD_V1_SEEN(idev)) {
1847 psf->sf_crcount = idev->mc_qrv;
1848 psf->sf_next = pmc->mca_tomb;
1849 pmc->mca_tomb = psf;
1850 rv = 1;
1851 } else
1852 kfree(psf);
1853 }
1854 return rv;
1855 }
1856
1857 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1858 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1859 int delta)
1860 {
1861 struct ifmcaddr6 *pmc;
1862 int changerec = 0;
1863 int i, err;
1864
1865 if (!idev)
1866 return -ENODEV;
1867 read_lock_bh(&idev->lock);
1868 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1869 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1870 break;
1871 }
1872 if (!pmc) {
1873 /* MCA not found?? bug */
1874 read_unlock_bh(&idev->lock);
1875 return -ESRCH;
1876 }
1877 spin_lock_bh(&pmc->mca_lock);
1878 sf_markstate(pmc);
1879 if (!delta) {
1880 if (!pmc->mca_sfcount[sfmode]) {
1881 spin_unlock_bh(&pmc->mca_lock);
1882 read_unlock_bh(&idev->lock);
1883 return -EINVAL;
1884 }
1885 pmc->mca_sfcount[sfmode]--;
1886 }
1887 err = 0;
1888 for (i=0; i<sfcount; i++) {
1889 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1890
1891 changerec |= rv > 0;
1892 if (!err && rv < 0)
1893 err = rv;
1894 }
1895 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1896 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1897 pmc->mca_sfcount[MCAST_INCLUDE]) {
1898 struct ip6_sf_list *psf;
1899
1900 /* filter mode change */
1901 pmc->mca_sfmode = MCAST_INCLUDE;
1902 pmc->mca_crcount = idev->mc_qrv;
1903 idev->mc_ifc_count = pmc->mca_crcount;
1904 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1905 psf->sf_crcount = 0;
1906 mld_ifc_event(pmc->idev);
1907 } else if (sf_setstate(pmc) || changerec)
1908 mld_ifc_event(pmc->idev);
1909 spin_unlock_bh(&pmc->mca_lock);
1910 read_unlock_bh(&idev->lock);
1911 return err;
1912 }
1913
1914 /*
1915 * Add multicast single-source filter to the interface list
1916 */
1917 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1918 const struct in6_addr *psfsrc)
1919 {
1920 struct ip6_sf_list *psf, *psf_prev;
1921
1922 psf_prev = NULL;
1923 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1924 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1925 break;
1926 psf_prev = psf;
1927 }
1928 if (!psf) {
1929 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1930 if (!psf)
1931 return -ENOBUFS;
1932
1933 psf->sf_addr = *psfsrc;
1934 if (psf_prev) {
1935 psf_prev->sf_next = psf;
1936 } else
1937 pmc->mca_sources = psf;
1938 }
1939 psf->sf_count[sfmode]++;
1940 return 0;
1941 }
1942
1943 static void sf_markstate(struct ifmcaddr6 *pmc)
1944 {
1945 struct ip6_sf_list *psf;
1946 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1947
1948 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1949 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1950 psf->sf_oldin = mca_xcount ==
1951 psf->sf_count[MCAST_EXCLUDE] &&
1952 !psf->sf_count[MCAST_INCLUDE];
1953 } else
1954 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1955 }
1956
1957 static int sf_setstate(struct ifmcaddr6 *pmc)
1958 {
1959 struct ip6_sf_list *psf, *dpsf;
1960 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1961 int qrv = pmc->idev->mc_qrv;
1962 int new_in, rv;
1963
1964 rv = 0;
1965 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1966 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1967 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1968 !psf->sf_count[MCAST_INCLUDE];
1969 } else
1970 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1971 if (new_in) {
1972 if (!psf->sf_oldin) {
1973 struct ip6_sf_list *prev = NULL;
1974
1975 for (dpsf=pmc->mca_tomb; dpsf;
1976 dpsf=dpsf->sf_next) {
1977 if (ipv6_addr_equal(&dpsf->sf_addr,
1978 &psf->sf_addr))
1979 break;
1980 prev = dpsf;
1981 }
1982 if (dpsf) {
1983 if (prev)
1984 prev->sf_next = dpsf->sf_next;
1985 else
1986 pmc->mca_tomb = dpsf->sf_next;
1987 kfree(dpsf);
1988 }
1989 psf->sf_crcount = qrv;
1990 rv++;
1991 }
1992 } else if (psf->sf_oldin) {
1993 psf->sf_crcount = 0;
1994 /*
1995 * add or update "delete" records if an active filter
1996 * is now inactive
1997 */
1998 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1999 if (ipv6_addr_equal(&dpsf->sf_addr,
2000 &psf->sf_addr))
2001 break;
2002 if (!dpsf) {
2003 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2004 if (!dpsf)
2005 continue;
2006 *dpsf = *psf;
2007 /* pmc->mca_lock held by callers */
2008 dpsf->sf_next = pmc->mca_tomb;
2009 pmc->mca_tomb = dpsf;
2010 }
2011 dpsf->sf_crcount = qrv;
2012 rv++;
2013 }
2014 }
2015 return rv;
2016 }
2017
2018 /*
2019 * Add multicast source filter list to the interface list
2020 */
2021 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2022 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2023 int delta)
2024 {
2025 struct ifmcaddr6 *pmc;
2026 int isexclude;
2027 int i, err;
2028
2029 if (!idev)
2030 return -ENODEV;
2031 read_lock_bh(&idev->lock);
2032 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2033 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2034 break;
2035 }
2036 if (!pmc) {
2037 /* MCA not found?? bug */
2038 read_unlock_bh(&idev->lock);
2039 return -ESRCH;
2040 }
2041 spin_lock_bh(&pmc->mca_lock);
2042
2043 sf_markstate(pmc);
2044 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2045 if (!delta)
2046 pmc->mca_sfcount[sfmode]++;
2047 err = 0;
2048 for (i=0; i<sfcount; i++) {
2049 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2050 if (err)
2051 break;
2052 }
2053 if (err) {
2054 int j;
2055
2056 if (!delta)
2057 pmc->mca_sfcount[sfmode]--;
2058 for (j=0; j<i; j++)
2059 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2060 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2061 struct ip6_sf_list *psf;
2062
2063 /* filter mode change */
2064 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2065 pmc->mca_sfmode = MCAST_EXCLUDE;
2066 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2067 pmc->mca_sfmode = MCAST_INCLUDE;
2068 /* else no filters; keep old mode for reports */
2069
2070 pmc->mca_crcount = idev->mc_qrv;
2071 idev->mc_ifc_count = pmc->mca_crcount;
2072 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2073 psf->sf_crcount = 0;
2074 mld_ifc_event(idev);
2075 } else if (sf_setstate(pmc))
2076 mld_ifc_event(idev);
2077 spin_unlock_bh(&pmc->mca_lock);
2078 read_unlock_bh(&idev->lock);
2079 return err;
2080 }
2081
2082 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2083 {
2084 struct ip6_sf_list *psf, *nextpsf;
2085
2086 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2087 nextpsf = psf->sf_next;
2088 kfree(psf);
2089 }
2090 pmc->mca_tomb = NULL;
2091 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2092 nextpsf = psf->sf_next;
2093 kfree(psf);
2094 }
2095 pmc->mca_sources = NULL;
2096 pmc->mca_sfmode = MCAST_EXCLUDE;
2097 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2098 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2099 }
2100
2101
2102 static void igmp6_join_group(struct ifmcaddr6 *ma)
2103 {
2104 unsigned long delay;
2105
2106 if (ma->mca_flags & MAF_NOREPORT)
2107 return;
2108
2109 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2110
2111 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2112
2113 spin_lock_bh(&ma->mca_lock);
2114 if (del_timer(&ma->mca_timer)) {
2115 atomic_dec(&ma->mca_refcnt);
2116 delay = ma->mca_timer.expires - jiffies;
2117 }
2118
2119 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2120 atomic_inc(&ma->mca_refcnt);
2121 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2122 spin_unlock_bh(&ma->mca_lock);
2123 }
2124
2125 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2126 struct inet6_dev *idev)
2127 {
2128 int err;
2129
2130 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2131 * so no other readers or writers of iml or its sflist
2132 */
2133 if (!iml->sflist) {
2134 /* any-source empty exclude case */
2135 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2136 }
2137 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2138 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2139 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2140 iml->sflist = NULL;
2141 return err;
2142 }
2143
2144 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2145 {
2146 if (MLD_V1_SEEN(ma->idev)) {
2147 if (ma->mca_flags & MAF_LAST_REPORTER)
2148 igmp6_send(&ma->mca_addr, ma->idev->dev,
2149 ICMPV6_MGM_REDUCTION);
2150 } else {
2151 mld_add_delrec(ma->idev, ma);
2152 mld_ifc_event(ma->idev);
2153 }
2154 }
2155
2156 static void mld_gq_timer_expire(unsigned long data)
2157 {
2158 struct inet6_dev *idev = (struct inet6_dev *)data;
2159
2160 idev->mc_gq_running = 0;
2161 mld_send_report(idev, NULL);
2162 in6_dev_put(idev);
2163 }
2164
2165 static void mld_ifc_timer_expire(unsigned long data)
2166 {
2167 struct inet6_dev *idev = (struct inet6_dev *)data;
2168
2169 mld_send_cr(idev);
2170 if (idev->mc_ifc_count) {
2171 idev->mc_ifc_count--;
2172 if (idev->mc_ifc_count)
2173 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2174 }
2175 in6_dev_put(idev);
2176 }
2177
2178 static void mld_ifc_event(struct inet6_dev *idev)
2179 {
2180 if (MLD_V1_SEEN(idev))
2181 return;
2182 idev->mc_ifc_count = idev->mc_qrv;
2183 mld_ifc_start_timer(idev, 1);
2184 }
2185
2186
2187 static void igmp6_timer_handler(unsigned long data)
2188 {
2189 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2190
2191 if (MLD_V1_SEEN(ma->idev))
2192 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2193 else
2194 mld_send_report(ma->idev, ma);
2195
2196 spin_lock(&ma->mca_lock);
2197 ma->mca_flags |= MAF_LAST_REPORTER;
2198 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2199 spin_unlock(&ma->mca_lock);
2200 ma_put(ma);
2201 }
2202
2203 /* Device changing type */
2204
2205 void ipv6_mc_unmap(struct inet6_dev *idev)
2206 {
2207 struct ifmcaddr6 *i;
2208
2209 /* Install multicast list, except for all-nodes (already installed) */
2210
2211 read_lock_bh(&idev->lock);
2212 for (i = idev->mc_list; i; i = i->next)
2213 igmp6_group_dropped(i);
2214 read_unlock_bh(&idev->lock);
2215 }
2216
2217 void ipv6_mc_remap(struct inet6_dev *idev)
2218 {
2219 ipv6_mc_up(idev);
2220 }
2221
2222 /* Device going down */
2223
2224 void ipv6_mc_down(struct inet6_dev *idev)
2225 {
2226 struct ifmcaddr6 *i;
2227
2228 /* Withdraw multicast list */
2229
2230 read_lock_bh(&idev->lock);
2231 idev->mc_ifc_count = 0;
2232 if (del_timer(&idev->mc_ifc_timer))
2233 __in6_dev_put(idev);
2234 idev->mc_gq_running = 0;
2235 if (del_timer(&idev->mc_gq_timer))
2236 __in6_dev_put(idev);
2237
2238 for (i = idev->mc_list; i; i=i->next)
2239 igmp6_group_dropped(i);
2240 read_unlock_bh(&idev->lock);
2241
2242 mld_clear_delrec(idev);
2243 }
2244
2245
2246 /* Device going up */
2247
2248 void ipv6_mc_up(struct inet6_dev *idev)
2249 {
2250 struct ifmcaddr6 *i;
2251
2252 /* Install multicast list, except for all-nodes (already installed) */
2253
2254 read_lock_bh(&idev->lock);
2255 for (i = idev->mc_list; i; i=i->next)
2256 igmp6_group_added(i);
2257 read_unlock_bh(&idev->lock);
2258 }
2259
2260 /* IPv6 device initialization. */
2261
2262 void ipv6_mc_init_dev(struct inet6_dev *idev)
2263 {
2264 write_lock_bh(&idev->lock);
2265 spin_lock_init(&idev->mc_lock);
2266 idev->mc_gq_running = 0;
2267 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2268 (unsigned long)idev);
2269 idev->mc_tomb = NULL;
2270 idev->mc_ifc_count = 0;
2271 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2272 (unsigned long)idev);
2273 idev->mc_qrv = MLD_QRV_DEFAULT;
2274 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2275 idev->mc_v1_seen = 0;
2276 write_unlock_bh(&idev->lock);
2277 }
2278
2279 /*
2280 * Device is about to be destroyed: clean up.
2281 */
2282
2283 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2284 {
2285 struct ifmcaddr6 *i;
2286
2287 /* Deactivate timers */
2288 ipv6_mc_down(idev);
2289
2290 /* Delete all-nodes address. */
2291 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2292 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2293 * fail.
2294 */
2295 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2296
2297 if (idev->cnf.forwarding)
2298 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2299
2300 write_lock_bh(&idev->lock);
2301 while ((i = idev->mc_list) != NULL) {
2302 idev->mc_list = i->next;
2303 write_unlock_bh(&idev->lock);
2304
2305 igmp6_group_dropped(i);
2306 ma_put(i);
2307
2308 write_lock_bh(&idev->lock);
2309 }
2310 write_unlock_bh(&idev->lock);
2311 }
2312
2313 #ifdef CONFIG_PROC_FS
2314 struct igmp6_mc_iter_state {
2315 struct seq_net_private p;
2316 struct net_device *dev;
2317 struct inet6_dev *idev;
2318 };
2319
2320 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2321
2322 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2323 {
2324 struct ifmcaddr6 *im = NULL;
2325 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2326 struct net *net = seq_file_net(seq);
2327
2328 state->idev = NULL;
2329 for_each_netdev_rcu(net, state->dev) {
2330 struct inet6_dev *idev;
2331 idev = __in6_dev_get(state->dev);
2332 if (!idev)
2333 continue;
2334 read_lock_bh(&idev->lock);
2335 im = idev->mc_list;
2336 if (im) {
2337 state->idev = idev;
2338 break;
2339 }
2340 read_unlock_bh(&idev->lock);
2341 }
2342 return im;
2343 }
2344
2345 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2346 {
2347 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2348
2349 im = im->next;
2350 while (!im) {
2351 if (likely(state->idev != NULL))
2352 read_unlock_bh(&state->idev->lock);
2353
2354 state->dev = next_net_device_rcu(state->dev);
2355 if (!state->dev) {
2356 state->idev = NULL;
2357 break;
2358 }
2359 state->idev = __in6_dev_get(state->dev);
2360 if (!state->idev)
2361 continue;
2362 read_lock_bh(&state->idev->lock);
2363 im = state->idev->mc_list;
2364 }
2365 return im;
2366 }
2367
2368 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2369 {
2370 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2371 if (im)
2372 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2373 --pos;
2374 return pos ? NULL : im;
2375 }
2376
2377 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2378 __acquires(RCU)
2379 {
2380 rcu_read_lock();
2381 return igmp6_mc_get_idx(seq, *pos);
2382 }
2383
2384 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2385 {
2386 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2387
2388 ++*pos;
2389 return im;
2390 }
2391
2392 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2393 __releases(RCU)
2394 {
2395 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2396
2397 if (likely(state->idev != NULL)) {
2398 read_unlock_bh(&state->idev->lock);
2399 state->idev = NULL;
2400 }
2401 state->dev = NULL;
2402 rcu_read_unlock();
2403 }
2404
2405 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2406 {
2407 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2408 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2409
2410 seq_printf(seq,
2411 "%-4d %-15s %pi6 %5d %08X %ld\n",
2412 state->dev->ifindex, state->dev->name,
2413 &im->mca_addr,
2414 im->mca_users, im->mca_flags,
2415 (im->mca_flags&MAF_TIMER_RUNNING) ?
2416 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2417 return 0;
2418 }
2419
2420 static const struct seq_operations igmp6_mc_seq_ops = {
2421 .start = igmp6_mc_seq_start,
2422 .next = igmp6_mc_seq_next,
2423 .stop = igmp6_mc_seq_stop,
2424 .show = igmp6_mc_seq_show,
2425 };
2426
2427 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2428 {
2429 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2430 sizeof(struct igmp6_mc_iter_state));
2431 }
2432
2433 static const struct file_operations igmp6_mc_seq_fops = {
2434 .owner = THIS_MODULE,
2435 .open = igmp6_mc_seq_open,
2436 .read = seq_read,
2437 .llseek = seq_lseek,
2438 .release = seq_release_net,
2439 };
2440
2441 struct igmp6_mcf_iter_state {
2442 struct seq_net_private p;
2443 struct net_device *dev;
2444 struct inet6_dev *idev;
2445 struct ifmcaddr6 *im;
2446 };
2447
2448 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2449
2450 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2451 {
2452 struct ip6_sf_list *psf = NULL;
2453 struct ifmcaddr6 *im = NULL;
2454 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2455 struct net *net = seq_file_net(seq);
2456
2457 state->idev = NULL;
2458 state->im = NULL;
2459 for_each_netdev_rcu(net, state->dev) {
2460 struct inet6_dev *idev;
2461 idev = __in6_dev_get(state->dev);
2462 if (unlikely(idev == NULL))
2463 continue;
2464 read_lock_bh(&idev->lock);
2465 im = idev->mc_list;
2466 if (likely(im != NULL)) {
2467 spin_lock_bh(&im->mca_lock);
2468 psf = im->mca_sources;
2469 if (likely(psf != NULL)) {
2470 state->im = im;
2471 state->idev = idev;
2472 break;
2473 }
2474 spin_unlock_bh(&im->mca_lock);
2475 }
2476 read_unlock_bh(&idev->lock);
2477 }
2478 return psf;
2479 }
2480
2481 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2482 {
2483 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2484
2485 psf = psf->sf_next;
2486 while (!psf) {
2487 spin_unlock_bh(&state->im->mca_lock);
2488 state->im = state->im->next;
2489 while (!state->im) {
2490 if (likely(state->idev != NULL))
2491 read_unlock_bh(&state->idev->lock);
2492
2493 state->dev = next_net_device_rcu(state->dev);
2494 if (!state->dev) {
2495 state->idev = NULL;
2496 goto out;
2497 }
2498 state->idev = __in6_dev_get(state->dev);
2499 if (!state->idev)
2500 continue;
2501 read_lock_bh(&state->idev->lock);
2502 state->im = state->idev->mc_list;
2503 }
2504 if (!state->im)
2505 break;
2506 spin_lock_bh(&state->im->mca_lock);
2507 psf = state->im->mca_sources;
2508 }
2509 out:
2510 return psf;
2511 }
2512
2513 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2514 {
2515 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2516 if (psf)
2517 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2518 --pos;
2519 return pos ? NULL : psf;
2520 }
2521
2522 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2523 __acquires(RCU)
2524 {
2525 rcu_read_lock();
2526 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2527 }
2528
2529 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2530 {
2531 struct ip6_sf_list *psf;
2532 if (v == SEQ_START_TOKEN)
2533 psf = igmp6_mcf_get_first(seq);
2534 else
2535 psf = igmp6_mcf_get_next(seq, v);
2536 ++*pos;
2537 return psf;
2538 }
2539
2540 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2541 __releases(RCU)
2542 {
2543 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2544 if (likely(state->im != NULL)) {
2545 spin_unlock_bh(&state->im->mca_lock);
2546 state->im = NULL;
2547 }
2548 if (likely(state->idev != NULL)) {
2549 read_unlock_bh(&state->idev->lock);
2550 state->idev = NULL;
2551 }
2552 state->dev = NULL;
2553 rcu_read_unlock();
2554 }
2555
2556 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2557 {
2558 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2559 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2560
2561 if (v == SEQ_START_TOKEN) {
2562 seq_printf(seq,
2563 "%3s %6s "
2564 "%32s %32s %6s %6s\n", "Idx",
2565 "Device", "Multicast Address",
2566 "Source Address", "INC", "EXC");
2567 } else {
2568 seq_printf(seq,
2569 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2570 state->dev->ifindex, state->dev->name,
2571 &state->im->mca_addr,
2572 &psf->sf_addr,
2573 psf->sf_count[MCAST_INCLUDE],
2574 psf->sf_count[MCAST_EXCLUDE]);
2575 }
2576 return 0;
2577 }
2578
2579 static const struct seq_operations igmp6_mcf_seq_ops = {
2580 .start = igmp6_mcf_seq_start,
2581 .next = igmp6_mcf_seq_next,
2582 .stop = igmp6_mcf_seq_stop,
2583 .show = igmp6_mcf_seq_show,
2584 };
2585
2586 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2587 {
2588 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2589 sizeof(struct igmp6_mcf_iter_state));
2590 }
2591
2592 static const struct file_operations igmp6_mcf_seq_fops = {
2593 .owner = THIS_MODULE,
2594 .open = igmp6_mcf_seq_open,
2595 .read = seq_read,
2596 .llseek = seq_lseek,
2597 .release = seq_release_net,
2598 };
2599
2600 static int __net_init igmp6_proc_init(struct net *net)
2601 {
2602 int err;
2603
2604 err = -ENOMEM;
2605 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2606 goto out;
2607 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2608 &igmp6_mcf_seq_fops))
2609 goto out_proc_net_igmp6;
2610
2611 err = 0;
2612 out:
2613 return err;
2614
2615 out_proc_net_igmp6:
2616 remove_proc_entry("igmp6", net->proc_net);
2617 goto out;
2618 }
2619
2620 static void __net_exit igmp6_proc_exit(struct net *net)
2621 {
2622 remove_proc_entry("mcfilter6", net->proc_net);
2623 remove_proc_entry("igmp6", net->proc_net);
2624 }
2625 #else
2626 static inline int igmp6_proc_init(struct net *net)
2627 {
2628 return 0;
2629 }
2630 static inline void igmp6_proc_exit(struct net *net)
2631 {
2632 }
2633 #endif
2634
2635 static int __net_init igmp6_net_init(struct net *net)
2636 {
2637 int err;
2638
2639 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2640 SOCK_RAW, IPPROTO_ICMPV6, net);
2641 if (err < 0) {
2642 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2643 err);
2644 goto out;
2645 }
2646
2647 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2648
2649 err = igmp6_proc_init(net);
2650 if (err)
2651 goto out_sock_create;
2652 out:
2653 return err;
2654
2655 out_sock_create:
2656 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2657 goto out;
2658 }
2659
2660 static void __net_exit igmp6_net_exit(struct net *net)
2661 {
2662 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2663 igmp6_proc_exit(net);
2664 }
2665
2666 static struct pernet_operations igmp6_net_ops = {
2667 .init = igmp6_net_init,
2668 .exit = igmp6_net_exit,
2669 };
2670
2671 int __init igmp6_init(void)
2672 {
2673 return register_pernet_subsys(&igmp6_net_ops);
2674 }
2675
2676 void igmp6_cleanup(void)
2677 {
2678 unregister_pernet_subsys(&igmp6_net_ops);
2679 }
kernel source for telekom puls (alcatel/mediatek)