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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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 spin_lock_bh(&mc->mca_lock);
665 if (!(mc->mca_flags&MAF_LOADED)) {
666 mc->mca_flags |= MAF_LOADED;
667 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
668 dev_mc_add(dev, buf);
669 }
670 spin_unlock_bh(&mc->mca_lock);
671
672 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
673 return;
674
675 if (MLD_V1_SEEN(mc->idev)) {
676 igmp6_join_group(mc);
677 return;
678 }
679 /* else v2 */
680
681 mc->mca_crcount = mc->idev->mc_qrv;
682 mld_ifc_event(mc->idev);
683 }
684
685 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
686 {
687 struct net_device *dev = mc->idev->dev;
688 char buf[MAX_ADDR_LEN];
689
690 spin_lock_bh(&mc->mca_lock);
691 if (mc->mca_flags&MAF_LOADED) {
692 mc->mca_flags &= ~MAF_LOADED;
693 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
694 dev_mc_del(dev, buf);
695 }
696
697 if (mc->mca_flags & MAF_NOREPORT)
698 goto done;
699 spin_unlock_bh(&mc->mca_lock);
700
701 if (!mc->idev->dead)
702 igmp6_leave_group(mc);
703
704 spin_lock_bh(&mc->mca_lock);
705 if (del_timer(&mc->mca_timer))
706 atomic_dec(&mc->mca_refcnt);
707 done:
708 ip6_mc_clear_src(mc);
709 spin_unlock_bh(&mc->mca_lock);
710 }
711
712 /*
713 * deleted ifmcaddr6 manipulation
714 */
715 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
716 {
717 struct ifmcaddr6 *pmc;
718
719 /* this is an "ifmcaddr6" for convenience; only the fields below
720 * are actually used. In particular, the refcnt and users are not
721 * used for management of the delete list. Using the same structure
722 * for deleted items allows change reports to use common code with
723 * non-deleted or query-response MCA's.
724 */
725 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
726 if (!pmc)
727 return;
728
729 spin_lock_bh(&im->mca_lock);
730 spin_lock_init(&pmc->mca_lock);
731 pmc->idev = im->idev;
732 in6_dev_hold(idev);
733 pmc->mca_addr = im->mca_addr;
734 pmc->mca_crcount = idev->mc_qrv;
735 pmc->mca_sfmode = im->mca_sfmode;
736 if (pmc->mca_sfmode == MCAST_INCLUDE) {
737 struct ip6_sf_list *psf;
738
739 pmc->mca_tomb = im->mca_tomb;
740 pmc->mca_sources = im->mca_sources;
741 im->mca_tomb = im->mca_sources = NULL;
742 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
743 psf->sf_crcount = pmc->mca_crcount;
744 }
745 spin_unlock_bh(&im->mca_lock);
746
747 spin_lock_bh(&idev->mc_lock);
748 pmc->next = idev->mc_tomb;
749 idev->mc_tomb = pmc;
750 spin_unlock_bh(&idev->mc_lock);
751 }
752
753 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
754 {
755 struct ifmcaddr6 *pmc, *pmc_prev;
756 struct ip6_sf_list *psf, *psf_next;
757
758 spin_lock_bh(&idev->mc_lock);
759 pmc_prev = NULL;
760 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
761 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
762 break;
763 pmc_prev = pmc;
764 }
765 if (pmc) {
766 if (pmc_prev)
767 pmc_prev->next = pmc->next;
768 else
769 idev->mc_tomb = pmc->next;
770 }
771 spin_unlock_bh(&idev->mc_lock);
772
773 if (pmc) {
774 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
775 psf_next = psf->sf_next;
776 kfree(psf);
777 }
778 in6_dev_put(pmc->idev);
779 kfree(pmc);
780 }
781 }
782
783 static void mld_clear_delrec(struct inet6_dev *idev)
784 {
785 struct ifmcaddr6 *pmc, *nextpmc;
786
787 spin_lock_bh(&idev->mc_lock);
788 pmc = idev->mc_tomb;
789 idev->mc_tomb = NULL;
790 spin_unlock_bh(&idev->mc_lock);
791
792 for (; pmc; pmc = nextpmc) {
793 nextpmc = pmc->next;
794 ip6_mc_clear_src(pmc);
795 in6_dev_put(pmc->idev);
796 kfree(pmc);
797 }
798
799 /* clear dead sources, too */
800 read_lock_bh(&idev->lock);
801 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
802 struct ip6_sf_list *psf, *psf_next;
803
804 spin_lock_bh(&pmc->mca_lock);
805 psf = pmc->mca_tomb;
806 pmc->mca_tomb = NULL;
807 spin_unlock_bh(&pmc->mca_lock);
808 for (; psf; psf=psf_next) {
809 psf_next = psf->sf_next;
810 kfree(psf);
811 }
812 }
813 read_unlock_bh(&idev->lock);
814 }
815
816
817 /*
818 * device multicast group inc (add if not found)
819 */
820 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
821 {
822 struct ifmcaddr6 *mc;
823 struct inet6_dev *idev;
824
825 /* we need to take a reference on idev */
826 idev = in6_dev_get(dev);
827
828 if (idev == NULL)
829 return -EINVAL;
830
831 write_lock_bh(&idev->lock);
832 if (idev->dead) {
833 write_unlock_bh(&idev->lock);
834 in6_dev_put(idev);
835 return -ENODEV;
836 }
837
838 for (mc = idev->mc_list; mc; mc = mc->next) {
839 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
840 mc->mca_users++;
841 write_unlock_bh(&idev->lock);
842 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
843 NULL, 0);
844 in6_dev_put(idev);
845 return 0;
846 }
847 }
848
849 /*
850 * not found: create a new one.
851 */
852
853 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
854
855 if (mc == NULL) {
856 write_unlock_bh(&idev->lock);
857 in6_dev_put(idev);
858 return -ENOMEM;
859 }
860
861 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
862
863 mc->mca_addr = *addr;
864 mc->idev = idev; /* (reference taken) */
865 mc->mca_users = 1;
866 /* mca_stamp should be updated upon changes */
867 mc->mca_cstamp = mc->mca_tstamp = jiffies;
868 atomic_set(&mc->mca_refcnt, 2);
869 spin_lock_init(&mc->mca_lock);
870
871 /* initial mode is (EX, empty) */
872 mc->mca_sfmode = MCAST_EXCLUDE;
873 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
874
875 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
876 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
877 mc->mca_flags |= MAF_NOREPORT;
878
879 mc->next = idev->mc_list;
880 idev->mc_list = mc;
881 write_unlock_bh(&idev->lock);
882
883 mld_del_delrec(idev, &mc->mca_addr);
884 igmp6_group_added(mc);
885 ma_put(mc);
886 return 0;
887 }
888
889 /*
890 * device multicast group del
891 */
892 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
893 {
894 struct ifmcaddr6 *ma, **map;
895
896 write_lock_bh(&idev->lock);
897 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
898 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
899 if (--ma->mca_users == 0) {
900 *map = ma->next;
901 write_unlock_bh(&idev->lock);
902
903 igmp6_group_dropped(ma);
904
905 ma_put(ma);
906 return 0;
907 }
908 write_unlock_bh(&idev->lock);
909 return 0;
910 }
911 }
912 write_unlock_bh(&idev->lock);
913
914 return -ENOENT;
915 }
916
917 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
918 {
919 struct inet6_dev *idev;
920 int err;
921
922 rcu_read_lock();
923
924 idev = __in6_dev_get(dev);
925 if (!idev)
926 err = -ENODEV;
927 else
928 err = __ipv6_dev_mc_dec(idev, addr);
929
930 rcu_read_unlock();
931 return err;
932 }
933
934 /*
935 * check if the interface/address pair is valid
936 */
937 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
938 const struct in6_addr *src_addr)
939 {
940 struct inet6_dev *idev;
941 struct ifmcaddr6 *mc;
942 bool rv = false;
943
944 rcu_read_lock();
945 idev = __in6_dev_get(dev);
946 if (idev) {
947 read_lock_bh(&idev->lock);
948 for (mc = idev->mc_list; mc; mc=mc->next) {
949 if (ipv6_addr_equal(&mc->mca_addr, group))
950 break;
951 }
952 if (mc) {
953 if (src_addr && !ipv6_addr_any(src_addr)) {
954 struct ip6_sf_list *psf;
955
956 spin_lock_bh(&mc->mca_lock);
957 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
958 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
959 break;
960 }
961 if (psf)
962 rv = psf->sf_count[MCAST_INCLUDE] ||
963 psf->sf_count[MCAST_EXCLUDE] !=
964 mc->mca_sfcount[MCAST_EXCLUDE];
965 else
966 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
967 spin_unlock_bh(&mc->mca_lock);
968 } else
969 rv = true; /* don't filter unspecified source */
970 }
971 read_unlock_bh(&idev->lock);
972 }
973 rcu_read_unlock();
974 return rv;
975 }
976
977 static void mld_gq_start_timer(struct inet6_dev *idev)
978 {
979 int tv = net_random() % idev->mc_maxdelay;
980
981 idev->mc_gq_running = 1;
982 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
983 in6_dev_hold(idev);
984 }
985
986 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
987 {
988 int tv = net_random() % delay;
989
990 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
991 in6_dev_hold(idev);
992 }
993
994 /*
995 * IGMP handling (alias multicast ICMPv6 messages)
996 */
997
998 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
999 {
1000 unsigned long delay = resptime;
1001
1002 /* Do not start timer for these addresses */
1003 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1004 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1005 return;
1006
1007 if (del_timer(&ma->mca_timer)) {
1008 atomic_dec(&ma->mca_refcnt);
1009 delay = ma->mca_timer.expires - jiffies;
1010 }
1011
1012 if (delay >= resptime) {
1013 if (resptime)
1014 delay = net_random() % resptime;
1015 else
1016 delay = 1;
1017 }
1018 ma->mca_timer.expires = jiffies + delay;
1019 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1020 atomic_inc(&ma->mca_refcnt);
1021 ma->mca_flags |= MAF_TIMER_RUNNING;
1022 }
1023
1024 /* mark EXCLUDE-mode sources */
1025 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1026 const struct in6_addr *srcs)
1027 {
1028 struct ip6_sf_list *psf;
1029 int i, scount;
1030
1031 scount = 0;
1032 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1033 if (scount == nsrcs)
1034 break;
1035 for (i=0; i<nsrcs; i++) {
1036 /* skip inactive filters */
1037 if (psf->sf_count[MCAST_INCLUDE] ||
1038 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1039 psf->sf_count[MCAST_EXCLUDE])
1040 break;
1041 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1042 scount++;
1043 break;
1044 }
1045 }
1046 }
1047 pmc->mca_flags &= ~MAF_GSQUERY;
1048 if (scount == nsrcs) /* all sources excluded */
1049 return false;
1050 return true;
1051 }
1052
1053 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1054 const struct in6_addr *srcs)
1055 {
1056 struct ip6_sf_list *psf;
1057 int i, scount;
1058
1059 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1060 return mld_xmarksources(pmc, nsrcs, srcs);
1061
1062 /* mark INCLUDE-mode sources */
1063
1064 scount = 0;
1065 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1066 if (scount == nsrcs)
1067 break;
1068 for (i=0; i<nsrcs; i++) {
1069 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1070 psf->sf_gsresp = 1;
1071 scount++;
1072 break;
1073 }
1074 }
1075 }
1076 if (!scount) {
1077 pmc->mca_flags &= ~MAF_GSQUERY;
1078 return false;
1079 }
1080 pmc->mca_flags |= MAF_GSQUERY;
1081 return true;
1082 }
1083
1084 /* called with rcu_read_lock() */
1085 int igmp6_event_query(struct sk_buff *skb)
1086 {
1087 struct mld2_query *mlh2 = NULL;
1088 struct ifmcaddr6 *ma;
1089 const struct in6_addr *group;
1090 unsigned long max_delay;
1091 struct inet6_dev *idev;
1092 struct mld_msg *mld;
1093 int group_type;
1094 int mark = 0;
1095 int len;
1096
1097 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1098 return -EINVAL;
1099
1100 /* compute payload length excluding extension headers */
1101 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1102 len -= skb_network_header_len(skb);
1103
1104 /* Drop queries with not link local source */
1105 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1106 return -EINVAL;
1107
1108 idev = __in6_dev_get(skb->dev);
1109
1110 if (idev == NULL)
1111 return 0;
1112
1113 mld = (struct mld_msg *)icmp6_hdr(skb);
1114 group = &mld->mld_mca;
1115 group_type = ipv6_addr_type(group);
1116
1117 if (group_type != IPV6_ADDR_ANY &&
1118 !(group_type&IPV6_ADDR_MULTICAST))
1119 return -EINVAL;
1120
1121 if (len == 24) {
1122 int switchback;
1123 /* MLDv1 router present */
1124
1125 /* Translate milliseconds to jiffies */
1126 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1127
1128 switchback = (idev->mc_qrv + 1) * max_delay;
1129 idev->mc_v1_seen = jiffies + switchback;
1130
1131 /* cancel the interface change timer */
1132 idev->mc_ifc_count = 0;
1133 if (del_timer(&idev->mc_ifc_timer))
1134 __in6_dev_put(idev);
1135 /* clear deleted report items */
1136 mld_clear_delrec(idev);
1137 } else if (len >= 28) {
1138 int srcs_offset = sizeof(struct mld2_query) -
1139 sizeof(struct icmp6hdr);
1140 if (!pskb_may_pull(skb, srcs_offset))
1141 return -EINVAL;
1142
1143 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1144 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1145 if (!max_delay)
1146 max_delay = 1;
1147 idev->mc_maxdelay = max_delay;
1148 if (mlh2->mld2q_qrv)
1149 idev->mc_qrv = mlh2->mld2q_qrv;
1150 if (group_type == IPV6_ADDR_ANY) { /* general query */
1151 if (mlh2->mld2q_nsrcs)
1152 return -EINVAL; /* no sources allowed */
1153
1154 mld_gq_start_timer(idev);
1155 return 0;
1156 }
1157 /* mark sources to include, if group & source-specific */
1158 if (mlh2->mld2q_nsrcs != 0) {
1159 if (!pskb_may_pull(skb, srcs_offset +
1160 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1161 return -EINVAL;
1162
1163 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1164 mark = 1;
1165 }
1166 } else
1167 return -EINVAL;
1168
1169 read_lock_bh(&idev->lock);
1170 if (group_type == IPV6_ADDR_ANY) {
1171 for (ma = idev->mc_list; ma; ma=ma->next) {
1172 spin_lock_bh(&ma->mca_lock);
1173 igmp6_group_queried(ma, max_delay);
1174 spin_unlock_bh(&ma->mca_lock);
1175 }
1176 } else {
1177 for (ma = idev->mc_list; ma; ma=ma->next) {
1178 if (!ipv6_addr_equal(group, &ma->mca_addr))
1179 continue;
1180 spin_lock_bh(&ma->mca_lock);
1181 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1182 /* gsquery <- gsquery && mark */
1183 if (!mark)
1184 ma->mca_flags &= ~MAF_GSQUERY;
1185 } else {
1186 /* gsquery <- mark */
1187 if (mark)
1188 ma->mca_flags |= MAF_GSQUERY;
1189 else
1190 ma->mca_flags &= ~MAF_GSQUERY;
1191 }
1192 if (!(ma->mca_flags & MAF_GSQUERY) ||
1193 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1194 igmp6_group_queried(ma, max_delay);
1195 spin_unlock_bh(&ma->mca_lock);
1196 break;
1197 }
1198 }
1199 read_unlock_bh(&idev->lock);
1200
1201 return 0;
1202 }
1203
1204 /* called with rcu_read_lock() */
1205 int igmp6_event_report(struct sk_buff *skb)
1206 {
1207 struct ifmcaddr6 *ma;
1208 struct inet6_dev *idev;
1209 struct mld_msg *mld;
1210 int addr_type;
1211
1212 /* Our own report looped back. Ignore it. */
1213 if (skb->pkt_type == PACKET_LOOPBACK)
1214 return 0;
1215
1216 /* send our report if the MC router may not have heard this report */
1217 if (skb->pkt_type != PACKET_MULTICAST &&
1218 skb->pkt_type != PACKET_BROADCAST)
1219 return 0;
1220
1221 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1222 return -EINVAL;
1223
1224 mld = (struct mld_msg *)icmp6_hdr(skb);
1225
1226 /* Drop reports with not link local source */
1227 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1228 if (addr_type != IPV6_ADDR_ANY &&
1229 !(addr_type&IPV6_ADDR_LINKLOCAL))
1230 return -EINVAL;
1231
1232 idev = __in6_dev_get(skb->dev);
1233 if (idev == NULL)
1234 return -ENODEV;
1235
1236 /*
1237 * Cancel the timer for this group
1238 */
1239
1240 read_lock_bh(&idev->lock);
1241 for (ma = idev->mc_list; ma; ma=ma->next) {
1242 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1243 spin_lock(&ma->mca_lock);
1244 if (del_timer(&ma->mca_timer))
1245 atomic_dec(&ma->mca_refcnt);
1246 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1247 spin_unlock(&ma->mca_lock);
1248 break;
1249 }
1250 }
1251 read_unlock_bh(&idev->lock);
1252 return 0;
1253 }
1254
1255 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1256 int gdeleted, int sdeleted)
1257 {
1258 switch (type) {
1259 case MLD2_MODE_IS_INCLUDE:
1260 case MLD2_MODE_IS_EXCLUDE:
1261 if (gdeleted || sdeleted)
1262 return false;
1263 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1264 if (pmc->mca_sfmode == MCAST_INCLUDE)
1265 return true;
1266 /* don't include if this source is excluded
1267 * in all filters
1268 */
1269 if (psf->sf_count[MCAST_INCLUDE])
1270 return type == MLD2_MODE_IS_INCLUDE;
1271 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1272 psf->sf_count[MCAST_EXCLUDE];
1273 }
1274 return false;
1275 case MLD2_CHANGE_TO_INCLUDE:
1276 if (gdeleted || sdeleted)
1277 return false;
1278 return psf->sf_count[MCAST_INCLUDE] != 0;
1279 case MLD2_CHANGE_TO_EXCLUDE:
1280 if (gdeleted || sdeleted)
1281 return false;
1282 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1283 psf->sf_count[MCAST_INCLUDE])
1284 return false;
1285 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1286 psf->sf_count[MCAST_EXCLUDE];
1287 case MLD2_ALLOW_NEW_SOURCES:
1288 if (gdeleted || !psf->sf_crcount)
1289 return false;
1290 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1291 case MLD2_BLOCK_OLD_SOURCES:
1292 if (pmc->mca_sfmode == MCAST_INCLUDE)
1293 return gdeleted || (psf->sf_crcount && sdeleted);
1294 return psf->sf_crcount && !gdeleted && !sdeleted;
1295 }
1296 return false;
1297 }
1298
1299 static int
1300 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1301 {
1302 struct ip6_sf_list *psf;
1303 int scount = 0;
1304
1305 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1306 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1307 continue;
1308 scount++;
1309 }
1310 return scount;
1311 }
1312
1313 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1314 struct net_device *dev,
1315 const struct in6_addr *saddr,
1316 const struct in6_addr *daddr,
1317 int proto, int len)
1318 {
1319 struct ipv6hdr *hdr;
1320
1321 skb->protocol = htons(ETH_P_IPV6);
1322 skb->dev = dev;
1323
1324 skb_reset_network_header(skb);
1325 skb_put(skb, sizeof(struct ipv6hdr));
1326 hdr = ipv6_hdr(skb);
1327
1328 ip6_flow_hdr(hdr, 0, 0);
1329
1330 hdr->payload_len = htons(len);
1331 hdr->nexthdr = proto;
1332 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1333
1334 hdr->saddr = *saddr;
1335 hdr->daddr = *daddr;
1336 }
1337
1338 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1339 {
1340 struct net *net = dev_net(dev);
1341 struct sock *sk = net->ipv6.igmp_sk;
1342 struct sk_buff *skb;
1343 struct mld2_report *pmr;
1344 struct in6_addr addr_buf;
1345 const struct in6_addr *saddr;
1346 int hlen = LL_RESERVED_SPACE(dev);
1347 int tlen = dev->needed_tailroom;
1348 int err;
1349 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1350 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1351 IPV6_TLV_PADN, 0 };
1352
1353 /* we assume size > sizeof(ra) here */
1354 size += hlen + tlen;
1355 /* limit our allocations to order-0 page */
1356 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1357 skb = sock_alloc_send_skb(sk, size, 1, &err);
1358
1359 if (!skb)
1360 return NULL;
1361
1362 skb_reserve(skb, hlen);
1363
1364 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1365 /* <draft-ietf-magma-mld-source-05.txt>:
1366 * use unspecified address as the source address
1367 * when a valid link-local address is not available.
1368 */
1369 saddr = &in6addr_any;
1370 } else
1371 saddr = &addr_buf;
1372
1373 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1374
1375 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1376
1377 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1378 skb_put(skb, sizeof(*pmr));
1379 pmr = (struct mld2_report *)skb_transport_header(skb);
1380 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1381 pmr->mld2r_resv1 = 0;
1382 pmr->mld2r_cksum = 0;
1383 pmr->mld2r_resv2 = 0;
1384 pmr->mld2r_ngrec = 0;
1385 return skb;
1386 }
1387
1388 static void mld_sendpack(struct sk_buff *skb)
1389 {
1390 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1391 struct mld2_report *pmr =
1392 (struct mld2_report *)skb_transport_header(skb);
1393 int payload_len, mldlen;
1394 struct inet6_dev *idev;
1395 struct net *net = dev_net(skb->dev);
1396 int err;
1397 struct flowi6 fl6;
1398 struct dst_entry *dst;
1399
1400 rcu_read_lock();
1401 idev = __in6_dev_get(skb->dev);
1402 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1403
1404 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1405 mldlen = skb->tail - skb->transport_header;
1406 pip6->payload_len = htons(payload_len);
1407
1408 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1409 IPPROTO_ICMPV6,
1410 csum_partial(skb_transport_header(skb),
1411 mldlen, 0));
1412
1413 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1414 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1415 skb->dev->ifindex);
1416 dst = icmp6_dst_alloc(skb->dev, &fl6);
1417
1418 err = 0;
1419 if (IS_ERR(dst)) {
1420 err = PTR_ERR(dst);
1421 dst = NULL;
1422 }
1423 skb_dst_set(skb, dst);
1424 if (err)
1425 goto err_out;
1426
1427 payload_len = skb->len;
1428
1429 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1430 dst_output);
1431 out:
1432 if (!err) {
1433 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1434 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1435 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1436 } else
1437 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1438
1439 rcu_read_unlock();
1440 return;
1441
1442 err_out:
1443 kfree_skb(skb);
1444 goto out;
1445 }
1446
1447 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1448 {
1449 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1450 }
1451
1452 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1453 int type, struct mld2_grec **ppgr)
1454 {
1455 struct net_device *dev = pmc->idev->dev;
1456 struct mld2_report *pmr;
1457 struct mld2_grec *pgr;
1458
1459 if (!skb)
1460 skb = mld_newpack(dev, dev->mtu);
1461 if (!skb)
1462 return NULL;
1463 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1464 pgr->grec_type = type;
1465 pgr->grec_auxwords = 0;
1466 pgr->grec_nsrcs = 0;
1467 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1468 pmr = (struct mld2_report *)skb_transport_header(skb);
1469 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1470 *ppgr = pgr;
1471 return skb;
1472 }
1473
1474 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1475 skb_tailroom(skb)) : 0)
1476
1477 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1478 int type, int gdeleted, int sdeleted)
1479 {
1480 struct net_device *dev = pmc->idev->dev;
1481 struct mld2_report *pmr;
1482 struct mld2_grec *pgr = NULL;
1483 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1484 int scount, stotal, first, isquery, truncate;
1485
1486 if (pmc->mca_flags & MAF_NOREPORT)
1487 return skb;
1488
1489 isquery = type == MLD2_MODE_IS_INCLUDE ||
1490 type == MLD2_MODE_IS_EXCLUDE;
1491 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1492 type == MLD2_CHANGE_TO_EXCLUDE;
1493
1494 stotal = scount = 0;
1495
1496 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1497
1498 if (!*psf_list)
1499 goto empty_source;
1500
1501 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1502
1503 /* EX and TO_EX get a fresh packet, if needed */
1504 if (truncate) {
1505 if (pmr && pmr->mld2r_ngrec &&
1506 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1507 if (skb)
1508 mld_sendpack(skb);
1509 skb = mld_newpack(dev, dev->mtu);
1510 }
1511 }
1512 first = 1;
1513 psf_prev = NULL;
1514 for (psf=*psf_list; psf; psf=psf_next) {
1515 struct in6_addr *psrc;
1516
1517 psf_next = psf->sf_next;
1518
1519 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1520 psf_prev = psf;
1521 continue;
1522 }
1523
1524 /* clear marks on query responses */
1525 if (isquery)
1526 psf->sf_gsresp = 0;
1527
1528 if (AVAILABLE(skb) < sizeof(*psrc) +
1529 first*sizeof(struct mld2_grec)) {
1530 if (truncate && !first)
1531 break; /* truncate these */
1532 if (pgr)
1533 pgr->grec_nsrcs = htons(scount);
1534 if (skb)
1535 mld_sendpack(skb);
1536 skb = mld_newpack(dev, dev->mtu);
1537 first = 1;
1538 scount = 0;
1539 }
1540 if (first) {
1541 skb = add_grhead(skb, pmc, type, &pgr);
1542 first = 0;
1543 }
1544 if (!skb)
1545 return NULL;
1546 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1547 *psrc = psf->sf_addr;
1548 scount++; stotal++;
1549 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1550 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1551 psf->sf_crcount--;
1552 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1553 if (psf_prev)
1554 psf_prev->sf_next = psf->sf_next;
1555 else
1556 *psf_list = psf->sf_next;
1557 kfree(psf);
1558 continue;
1559 }
1560 }
1561 psf_prev = psf;
1562 }
1563
1564 empty_source:
1565 if (!stotal) {
1566 if (type == MLD2_ALLOW_NEW_SOURCES ||
1567 type == MLD2_BLOCK_OLD_SOURCES)
1568 return skb;
1569 if (pmc->mca_crcount || isquery) {
1570 /* make sure we have room for group header */
1571 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1572 mld_sendpack(skb);
1573 skb = NULL; /* add_grhead will get a new one */
1574 }
1575 skb = add_grhead(skb, pmc, type, &pgr);
1576 }
1577 }
1578 if (pgr)
1579 pgr->grec_nsrcs = htons(scount);
1580
1581 if (isquery)
1582 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1583 return skb;
1584 }
1585
1586 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1587 {
1588 struct sk_buff *skb = NULL;
1589 int type;
1590
1591 if (!pmc) {
1592 read_lock_bh(&idev->lock);
1593 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1594 if (pmc->mca_flags & MAF_NOREPORT)
1595 continue;
1596 spin_lock_bh(&pmc->mca_lock);
1597 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1598 type = MLD2_MODE_IS_EXCLUDE;
1599 else
1600 type = MLD2_MODE_IS_INCLUDE;
1601 skb = add_grec(skb, pmc, type, 0, 0);
1602 spin_unlock_bh(&pmc->mca_lock);
1603 }
1604 read_unlock_bh(&idev->lock);
1605 } else {
1606 spin_lock_bh(&pmc->mca_lock);
1607 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1608 type = MLD2_MODE_IS_EXCLUDE;
1609 else
1610 type = MLD2_MODE_IS_INCLUDE;
1611 skb = add_grec(skb, pmc, type, 0, 0);
1612 spin_unlock_bh(&pmc->mca_lock);
1613 }
1614 if (skb)
1615 mld_sendpack(skb);
1616 }
1617
1618 /*
1619 * remove zero-count source records from a source filter list
1620 */
1621 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1622 {
1623 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1624
1625 psf_prev = NULL;
1626 for (psf=*ppsf; psf; psf = psf_next) {
1627 psf_next = psf->sf_next;
1628 if (psf->sf_crcount == 0) {
1629 if (psf_prev)
1630 psf_prev->sf_next = psf->sf_next;
1631 else
1632 *ppsf = psf->sf_next;
1633 kfree(psf);
1634 } else
1635 psf_prev = psf;
1636 }
1637 }
1638
1639 static void mld_send_cr(struct inet6_dev *idev)
1640 {
1641 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1642 struct sk_buff *skb = NULL;
1643 int type, dtype;
1644
1645 read_lock_bh(&idev->lock);
1646 spin_lock(&idev->mc_lock);
1647
1648 /* deleted MCA's */
1649 pmc_prev = NULL;
1650 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1651 pmc_next = pmc->next;
1652 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1653 type = MLD2_BLOCK_OLD_SOURCES;
1654 dtype = MLD2_BLOCK_OLD_SOURCES;
1655 skb = add_grec(skb, pmc, type, 1, 0);
1656 skb = add_grec(skb, pmc, dtype, 1, 1);
1657 }
1658 if (pmc->mca_crcount) {
1659 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1660 type = MLD2_CHANGE_TO_INCLUDE;
1661 skb = add_grec(skb, pmc, type, 1, 0);
1662 }
1663 pmc->mca_crcount--;
1664 if (pmc->mca_crcount == 0) {
1665 mld_clear_zeros(&pmc->mca_tomb);
1666 mld_clear_zeros(&pmc->mca_sources);
1667 }
1668 }
1669 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1670 !pmc->mca_sources) {
1671 if (pmc_prev)
1672 pmc_prev->next = pmc_next;
1673 else
1674 idev->mc_tomb = pmc_next;
1675 in6_dev_put(pmc->idev);
1676 kfree(pmc);
1677 } else
1678 pmc_prev = pmc;
1679 }
1680 spin_unlock(&idev->mc_lock);
1681
1682 /* change recs */
1683 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1684 spin_lock_bh(&pmc->mca_lock);
1685 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1686 type = MLD2_BLOCK_OLD_SOURCES;
1687 dtype = MLD2_ALLOW_NEW_SOURCES;
1688 } else {
1689 type = MLD2_ALLOW_NEW_SOURCES;
1690 dtype = MLD2_BLOCK_OLD_SOURCES;
1691 }
1692 skb = add_grec(skb, pmc, type, 0, 0);
1693 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1694
1695 /* filter mode changes */
1696 if (pmc->mca_crcount) {
1697 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1698 type = MLD2_CHANGE_TO_EXCLUDE;
1699 else
1700 type = MLD2_CHANGE_TO_INCLUDE;
1701 skb = add_grec(skb, pmc, type, 0, 0);
1702 pmc->mca_crcount--;
1703 }
1704 spin_unlock_bh(&pmc->mca_lock);
1705 }
1706 read_unlock_bh(&idev->lock);
1707 if (!skb)
1708 return;
1709 (void) mld_sendpack(skb);
1710 }
1711
1712 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1713 {
1714 struct net *net = dev_net(dev);
1715 struct sock *sk = net->ipv6.igmp_sk;
1716 struct inet6_dev *idev;
1717 struct sk_buff *skb;
1718 struct mld_msg *hdr;
1719 const struct in6_addr *snd_addr, *saddr;
1720 struct in6_addr addr_buf;
1721 int hlen = LL_RESERVED_SPACE(dev);
1722 int tlen = dev->needed_tailroom;
1723 int err, len, payload_len, full_len;
1724 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1725 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1726 IPV6_TLV_PADN, 0 };
1727 struct flowi6 fl6;
1728 struct dst_entry *dst;
1729
1730 if (type == ICMPV6_MGM_REDUCTION)
1731 snd_addr = &in6addr_linklocal_allrouters;
1732 else
1733 snd_addr = addr;
1734
1735 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1736 payload_len = len + sizeof(ra);
1737 full_len = sizeof(struct ipv6hdr) + payload_len;
1738
1739 rcu_read_lock();
1740 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1741 IPSTATS_MIB_OUT, full_len);
1742 rcu_read_unlock();
1743
1744 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1745
1746 if (skb == NULL) {
1747 rcu_read_lock();
1748 IP6_INC_STATS(net, __in6_dev_get(dev),
1749 IPSTATS_MIB_OUTDISCARDS);
1750 rcu_read_unlock();
1751 return;
1752 }
1753
1754 skb_reserve(skb, hlen);
1755
1756 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1757 /* <draft-ietf-magma-mld-source-05.txt>:
1758 * use unspecified address as the source address
1759 * when a valid link-local address is not available.
1760 */
1761 saddr = &in6addr_any;
1762 } else
1763 saddr = &addr_buf;
1764
1765 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1766
1767 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1768
1769 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1770 memset(hdr, 0, sizeof(struct mld_msg));
1771 hdr->mld_type = type;
1772 hdr->mld_mca = *addr;
1773
1774 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1775 IPPROTO_ICMPV6,
1776 csum_partial(hdr, len, 0));
1777
1778 rcu_read_lock();
1779 idev = __in6_dev_get(skb->dev);
1780
1781 icmpv6_flow_init(sk, &fl6, type,
1782 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1783 skb->dev->ifindex);
1784 dst = icmp6_dst_alloc(skb->dev, &fl6);
1785 if (IS_ERR(dst)) {
1786 err = PTR_ERR(dst);
1787 goto err_out;
1788 }
1789
1790 skb_dst_set(skb, dst);
1791 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1792 dst_output);
1793 out:
1794 if (!err) {
1795 ICMP6MSGOUT_INC_STATS(net, idev, type);
1796 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1797 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1798 } else
1799 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1800
1801 rcu_read_unlock();
1802 return;
1803
1804 err_out:
1805 kfree_skb(skb);
1806 goto out;
1807 }
1808
1809 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1810 const struct in6_addr *psfsrc)
1811 {
1812 struct ip6_sf_list *psf, *psf_prev;
1813 int rv = 0;
1814
1815 psf_prev = NULL;
1816 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1817 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1818 break;
1819 psf_prev = psf;
1820 }
1821 if (!psf || psf->sf_count[sfmode] == 0) {
1822 /* source filter not found, or count wrong => bug */
1823 return -ESRCH;
1824 }
1825 psf->sf_count[sfmode]--;
1826 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1827 struct inet6_dev *idev = pmc->idev;
1828
1829 /* no more filters for this source */
1830 if (psf_prev)
1831 psf_prev->sf_next = psf->sf_next;
1832 else
1833 pmc->mca_sources = psf->sf_next;
1834 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1835 !MLD_V1_SEEN(idev)) {
1836 psf->sf_crcount = idev->mc_qrv;
1837 psf->sf_next = pmc->mca_tomb;
1838 pmc->mca_tomb = psf;
1839 rv = 1;
1840 } else
1841 kfree(psf);
1842 }
1843 return rv;
1844 }
1845
1846 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1847 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1848 int delta)
1849 {
1850 struct ifmcaddr6 *pmc;
1851 int changerec = 0;
1852 int i, err;
1853
1854 if (!idev)
1855 return -ENODEV;
1856 read_lock_bh(&idev->lock);
1857 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1858 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1859 break;
1860 }
1861 if (!pmc) {
1862 /* MCA not found?? bug */
1863 read_unlock_bh(&idev->lock);
1864 return -ESRCH;
1865 }
1866 spin_lock_bh(&pmc->mca_lock);
1867 sf_markstate(pmc);
1868 if (!delta) {
1869 if (!pmc->mca_sfcount[sfmode]) {
1870 spin_unlock_bh(&pmc->mca_lock);
1871 read_unlock_bh(&idev->lock);
1872 return -EINVAL;
1873 }
1874 pmc->mca_sfcount[sfmode]--;
1875 }
1876 err = 0;
1877 for (i=0; i<sfcount; i++) {
1878 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1879
1880 changerec |= rv > 0;
1881 if (!err && rv < 0)
1882 err = rv;
1883 }
1884 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1885 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1886 pmc->mca_sfcount[MCAST_INCLUDE]) {
1887 struct ip6_sf_list *psf;
1888
1889 /* filter mode change */
1890 pmc->mca_sfmode = MCAST_INCLUDE;
1891 pmc->mca_crcount = idev->mc_qrv;
1892 idev->mc_ifc_count = pmc->mca_crcount;
1893 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1894 psf->sf_crcount = 0;
1895 mld_ifc_event(pmc->idev);
1896 } else if (sf_setstate(pmc) || changerec)
1897 mld_ifc_event(pmc->idev);
1898 spin_unlock_bh(&pmc->mca_lock);
1899 read_unlock_bh(&idev->lock);
1900 return err;
1901 }
1902
1903 /*
1904 * Add multicast single-source filter to the interface list
1905 */
1906 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1907 const struct in6_addr *psfsrc)
1908 {
1909 struct ip6_sf_list *psf, *psf_prev;
1910
1911 psf_prev = NULL;
1912 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1913 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1914 break;
1915 psf_prev = psf;
1916 }
1917 if (!psf) {
1918 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1919 if (!psf)
1920 return -ENOBUFS;
1921
1922 psf->sf_addr = *psfsrc;
1923 if (psf_prev) {
1924 psf_prev->sf_next = psf;
1925 } else
1926 pmc->mca_sources = psf;
1927 }
1928 psf->sf_count[sfmode]++;
1929 return 0;
1930 }
1931
1932 static void sf_markstate(struct ifmcaddr6 *pmc)
1933 {
1934 struct ip6_sf_list *psf;
1935 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1936
1937 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1938 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1939 psf->sf_oldin = mca_xcount ==
1940 psf->sf_count[MCAST_EXCLUDE] &&
1941 !psf->sf_count[MCAST_INCLUDE];
1942 } else
1943 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1944 }
1945
1946 static int sf_setstate(struct ifmcaddr6 *pmc)
1947 {
1948 struct ip6_sf_list *psf, *dpsf;
1949 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1950 int qrv = pmc->idev->mc_qrv;
1951 int new_in, rv;
1952
1953 rv = 0;
1954 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1955 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1956 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1957 !psf->sf_count[MCAST_INCLUDE];
1958 } else
1959 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1960 if (new_in) {
1961 if (!psf->sf_oldin) {
1962 struct ip6_sf_list *prev = NULL;
1963
1964 for (dpsf=pmc->mca_tomb; dpsf;
1965 dpsf=dpsf->sf_next) {
1966 if (ipv6_addr_equal(&dpsf->sf_addr,
1967 &psf->sf_addr))
1968 break;
1969 prev = dpsf;
1970 }
1971 if (dpsf) {
1972 if (prev)
1973 prev->sf_next = dpsf->sf_next;
1974 else
1975 pmc->mca_tomb = dpsf->sf_next;
1976 kfree(dpsf);
1977 }
1978 psf->sf_crcount = qrv;
1979 rv++;
1980 }
1981 } else if (psf->sf_oldin) {
1982 psf->sf_crcount = 0;
1983 /*
1984 * add or update "delete" records if an active filter
1985 * is now inactive
1986 */
1987 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1988 if (ipv6_addr_equal(&dpsf->sf_addr,
1989 &psf->sf_addr))
1990 break;
1991 if (!dpsf) {
1992 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1993 if (!dpsf)
1994 continue;
1995 *dpsf = *psf;
1996 /* pmc->mca_lock held by callers */
1997 dpsf->sf_next = pmc->mca_tomb;
1998 pmc->mca_tomb = dpsf;
1999 }
2000 dpsf->sf_crcount = qrv;
2001 rv++;
2002 }
2003 }
2004 return rv;
2005 }
2006
2007 /*
2008 * Add multicast source filter list to the interface list
2009 */
2010 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2011 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2012 int delta)
2013 {
2014 struct ifmcaddr6 *pmc;
2015 int isexclude;
2016 int i, err;
2017
2018 if (!idev)
2019 return -ENODEV;
2020 read_lock_bh(&idev->lock);
2021 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2022 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2023 break;
2024 }
2025 if (!pmc) {
2026 /* MCA not found?? bug */
2027 read_unlock_bh(&idev->lock);
2028 return -ESRCH;
2029 }
2030 spin_lock_bh(&pmc->mca_lock);
2031
2032 sf_markstate(pmc);
2033 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2034 if (!delta)
2035 pmc->mca_sfcount[sfmode]++;
2036 err = 0;
2037 for (i=0; i<sfcount; i++) {
2038 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2039 if (err)
2040 break;
2041 }
2042 if (err) {
2043 int j;
2044
2045 if (!delta)
2046 pmc->mca_sfcount[sfmode]--;
2047 for (j=0; j<i; j++)
2048 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2049 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2050 struct ip6_sf_list *psf;
2051
2052 /* filter mode change */
2053 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2054 pmc->mca_sfmode = MCAST_EXCLUDE;
2055 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2056 pmc->mca_sfmode = MCAST_INCLUDE;
2057 /* else no filters; keep old mode for reports */
2058
2059 pmc->mca_crcount = idev->mc_qrv;
2060 idev->mc_ifc_count = pmc->mca_crcount;
2061 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2062 psf->sf_crcount = 0;
2063 mld_ifc_event(idev);
2064 } else if (sf_setstate(pmc))
2065 mld_ifc_event(idev);
2066 spin_unlock_bh(&pmc->mca_lock);
2067 read_unlock_bh(&idev->lock);
2068 return err;
2069 }
2070
2071 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2072 {
2073 struct ip6_sf_list *psf, *nextpsf;
2074
2075 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2076 nextpsf = psf->sf_next;
2077 kfree(psf);
2078 }
2079 pmc->mca_tomb = NULL;
2080 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2081 nextpsf = psf->sf_next;
2082 kfree(psf);
2083 }
2084 pmc->mca_sources = NULL;
2085 pmc->mca_sfmode = MCAST_EXCLUDE;
2086 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2087 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2088 }
2089
2090
2091 static void igmp6_join_group(struct ifmcaddr6 *ma)
2092 {
2093 unsigned long delay;
2094
2095 if (ma->mca_flags & MAF_NOREPORT)
2096 return;
2097
2098 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2099
2100 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2101
2102 spin_lock_bh(&ma->mca_lock);
2103 if (del_timer(&ma->mca_timer)) {
2104 atomic_dec(&ma->mca_refcnt);
2105 delay = ma->mca_timer.expires - jiffies;
2106 }
2107
2108 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2109 atomic_inc(&ma->mca_refcnt);
2110 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2111 spin_unlock_bh(&ma->mca_lock);
2112 }
2113
2114 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2115 struct inet6_dev *idev)
2116 {
2117 int err;
2118
2119 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2120 * so no other readers or writers of iml or its sflist
2121 */
2122 if (!iml->sflist) {
2123 /* any-source empty exclude case */
2124 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2125 }
2126 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2127 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2128 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2129 iml->sflist = NULL;
2130 return err;
2131 }
2132
2133 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2134 {
2135 if (MLD_V1_SEEN(ma->idev)) {
2136 if (ma->mca_flags & MAF_LAST_REPORTER)
2137 igmp6_send(&ma->mca_addr, ma->idev->dev,
2138 ICMPV6_MGM_REDUCTION);
2139 } else {
2140 mld_add_delrec(ma->idev, ma);
2141 mld_ifc_event(ma->idev);
2142 }
2143 }
2144
2145 static void mld_gq_timer_expire(unsigned long data)
2146 {
2147 struct inet6_dev *idev = (struct inet6_dev *)data;
2148
2149 idev->mc_gq_running = 0;
2150 mld_send_report(idev, NULL);
2151 __in6_dev_put(idev);
2152 }
2153
2154 static void mld_ifc_timer_expire(unsigned long data)
2155 {
2156 struct inet6_dev *idev = (struct inet6_dev *)data;
2157
2158 mld_send_cr(idev);
2159 if (idev->mc_ifc_count) {
2160 idev->mc_ifc_count--;
2161 if (idev->mc_ifc_count)
2162 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2163 }
2164 __in6_dev_put(idev);
2165 }
2166
2167 static void mld_ifc_event(struct inet6_dev *idev)
2168 {
2169 if (MLD_V1_SEEN(idev))
2170 return;
2171 idev->mc_ifc_count = idev->mc_qrv;
2172 mld_ifc_start_timer(idev, 1);
2173 }
2174
2175
2176 static void igmp6_timer_handler(unsigned long data)
2177 {
2178 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2179
2180 if (MLD_V1_SEEN(ma->idev))
2181 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2182 else
2183 mld_send_report(ma->idev, ma);
2184
2185 spin_lock(&ma->mca_lock);
2186 ma->mca_flags |= MAF_LAST_REPORTER;
2187 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2188 spin_unlock(&ma->mca_lock);
2189 ma_put(ma);
2190 }
2191
2192 /* Device changing type */
2193
2194 void ipv6_mc_unmap(struct inet6_dev *idev)
2195 {
2196 struct ifmcaddr6 *i;
2197
2198 /* Install multicast list, except for all-nodes (already installed) */
2199
2200 read_lock_bh(&idev->lock);
2201 for (i = idev->mc_list; i; i = i->next)
2202 igmp6_group_dropped(i);
2203 read_unlock_bh(&idev->lock);
2204 }
2205
2206 void ipv6_mc_remap(struct inet6_dev *idev)
2207 {
2208 ipv6_mc_up(idev);
2209 }
2210
2211 /* Device going down */
2212
2213 void ipv6_mc_down(struct inet6_dev *idev)
2214 {
2215 struct ifmcaddr6 *i;
2216
2217 /* Withdraw multicast list */
2218
2219 read_lock_bh(&idev->lock);
2220 idev->mc_ifc_count = 0;
2221 if (del_timer(&idev->mc_ifc_timer))
2222 __in6_dev_put(idev);
2223 idev->mc_gq_running = 0;
2224 if (del_timer(&idev->mc_gq_timer))
2225 __in6_dev_put(idev);
2226
2227 for (i = idev->mc_list; i; i=i->next)
2228 igmp6_group_dropped(i);
2229 read_unlock_bh(&idev->lock);
2230
2231 mld_clear_delrec(idev);
2232 }
2233
2234
2235 /* Device going up */
2236
2237 void ipv6_mc_up(struct inet6_dev *idev)
2238 {
2239 struct ifmcaddr6 *i;
2240
2241 /* Install multicast list, except for all-nodes (already installed) */
2242
2243 read_lock_bh(&idev->lock);
2244 for (i = idev->mc_list; i; i=i->next)
2245 igmp6_group_added(i);
2246 read_unlock_bh(&idev->lock);
2247 }
2248
2249 /* IPv6 device initialization. */
2250
2251 void ipv6_mc_init_dev(struct inet6_dev *idev)
2252 {
2253 write_lock_bh(&idev->lock);
2254 spin_lock_init(&idev->mc_lock);
2255 idev->mc_gq_running = 0;
2256 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2257 (unsigned long)idev);
2258 idev->mc_tomb = NULL;
2259 idev->mc_ifc_count = 0;
2260 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2261 (unsigned long)idev);
2262 idev->mc_qrv = MLD_QRV_DEFAULT;
2263 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2264 idev->mc_v1_seen = 0;
2265 write_unlock_bh(&idev->lock);
2266 }
2267
2268 /*
2269 * Device is about to be destroyed: clean up.
2270 */
2271
2272 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2273 {
2274 struct ifmcaddr6 *i;
2275
2276 /* Deactivate timers */
2277 ipv6_mc_down(idev);
2278
2279 /* Delete all-nodes address. */
2280 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2281 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2282 * fail.
2283 */
2284 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2285
2286 if (idev->cnf.forwarding)
2287 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2288
2289 write_lock_bh(&idev->lock);
2290 while ((i = idev->mc_list) != NULL) {
2291 idev->mc_list = i->next;
2292 write_unlock_bh(&idev->lock);
2293
2294 igmp6_group_dropped(i);
2295 ma_put(i);
2296
2297 write_lock_bh(&idev->lock);
2298 }
2299 write_unlock_bh(&idev->lock);
2300 }
2301
2302 #ifdef CONFIG_PROC_FS
2303 struct igmp6_mc_iter_state {
2304 struct seq_net_private p;
2305 struct net_device *dev;
2306 struct inet6_dev *idev;
2307 };
2308
2309 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2310
2311 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2312 {
2313 struct ifmcaddr6 *im = NULL;
2314 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2315 struct net *net = seq_file_net(seq);
2316
2317 state->idev = NULL;
2318 for_each_netdev_rcu(net, state->dev) {
2319 struct inet6_dev *idev;
2320 idev = __in6_dev_get(state->dev);
2321 if (!idev)
2322 continue;
2323 read_lock_bh(&idev->lock);
2324 im = idev->mc_list;
2325 if (im) {
2326 state->idev = idev;
2327 break;
2328 }
2329 read_unlock_bh(&idev->lock);
2330 }
2331 return im;
2332 }
2333
2334 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2335 {
2336 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2337
2338 im = im->next;
2339 while (!im) {
2340 if (likely(state->idev != NULL))
2341 read_unlock_bh(&state->idev->lock);
2342
2343 state->dev = next_net_device_rcu(state->dev);
2344 if (!state->dev) {
2345 state->idev = NULL;
2346 break;
2347 }
2348 state->idev = __in6_dev_get(state->dev);
2349 if (!state->idev)
2350 continue;
2351 read_lock_bh(&state->idev->lock);
2352 im = state->idev->mc_list;
2353 }
2354 return im;
2355 }
2356
2357 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2358 {
2359 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2360 if (im)
2361 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2362 --pos;
2363 return pos ? NULL : im;
2364 }
2365
2366 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2367 __acquires(RCU)
2368 {
2369 rcu_read_lock();
2370 return igmp6_mc_get_idx(seq, *pos);
2371 }
2372
2373 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2374 {
2375 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2376
2377 ++*pos;
2378 return im;
2379 }
2380
2381 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2382 __releases(RCU)
2383 {
2384 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2385
2386 if (likely(state->idev != NULL)) {
2387 read_unlock_bh(&state->idev->lock);
2388 state->idev = NULL;
2389 }
2390 state->dev = NULL;
2391 rcu_read_unlock();
2392 }
2393
2394 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2395 {
2396 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2397 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2398
2399 seq_printf(seq,
2400 "%-4d %-15s %pi6 %5d %08X %ld\n",
2401 state->dev->ifindex, state->dev->name,
2402 &im->mca_addr,
2403 im->mca_users, im->mca_flags,
2404 (im->mca_flags&MAF_TIMER_RUNNING) ?
2405 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2406 return 0;
2407 }
2408
2409 static const struct seq_operations igmp6_mc_seq_ops = {
2410 .start = igmp6_mc_seq_start,
2411 .next = igmp6_mc_seq_next,
2412 .stop = igmp6_mc_seq_stop,
2413 .show = igmp6_mc_seq_show,
2414 };
2415
2416 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2417 {
2418 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2419 sizeof(struct igmp6_mc_iter_state));
2420 }
2421
2422 static const struct file_operations igmp6_mc_seq_fops = {
2423 .owner = THIS_MODULE,
2424 .open = igmp6_mc_seq_open,
2425 .read = seq_read,
2426 .llseek = seq_lseek,
2427 .release = seq_release_net,
2428 };
2429
2430 struct igmp6_mcf_iter_state {
2431 struct seq_net_private p;
2432 struct net_device *dev;
2433 struct inet6_dev *idev;
2434 struct ifmcaddr6 *im;
2435 };
2436
2437 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2438
2439 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2440 {
2441 struct ip6_sf_list *psf = NULL;
2442 struct ifmcaddr6 *im = NULL;
2443 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2444 struct net *net = seq_file_net(seq);
2445
2446 state->idev = NULL;
2447 state->im = NULL;
2448 for_each_netdev_rcu(net, state->dev) {
2449 struct inet6_dev *idev;
2450 idev = __in6_dev_get(state->dev);
2451 if (unlikely(idev == NULL))
2452 continue;
2453 read_lock_bh(&idev->lock);
2454 im = idev->mc_list;
2455 if (likely(im != NULL)) {
2456 spin_lock_bh(&im->mca_lock);
2457 psf = im->mca_sources;
2458 if (likely(psf != NULL)) {
2459 state->im = im;
2460 state->idev = idev;
2461 break;
2462 }
2463 spin_unlock_bh(&im->mca_lock);
2464 }
2465 read_unlock_bh(&idev->lock);
2466 }
2467 return psf;
2468 }
2469
2470 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2471 {
2472 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2473
2474 psf = psf->sf_next;
2475 while (!psf) {
2476 spin_unlock_bh(&state->im->mca_lock);
2477 state->im = state->im->next;
2478 while (!state->im) {
2479 if (likely(state->idev != NULL))
2480 read_unlock_bh(&state->idev->lock);
2481
2482 state->dev = next_net_device_rcu(state->dev);
2483 if (!state->dev) {
2484 state->idev = NULL;
2485 goto out;
2486 }
2487 state->idev = __in6_dev_get(state->dev);
2488 if (!state->idev)
2489 continue;
2490 read_lock_bh(&state->idev->lock);
2491 state->im = state->idev->mc_list;
2492 }
2493 if (!state->im)
2494 break;
2495 spin_lock_bh(&state->im->mca_lock);
2496 psf = state->im->mca_sources;
2497 }
2498 out:
2499 return psf;
2500 }
2501
2502 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2503 {
2504 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2505 if (psf)
2506 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2507 --pos;
2508 return pos ? NULL : psf;
2509 }
2510
2511 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2512 __acquires(RCU)
2513 {
2514 rcu_read_lock();
2515 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2516 }
2517
2518 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2519 {
2520 struct ip6_sf_list *psf;
2521 if (v == SEQ_START_TOKEN)
2522 psf = igmp6_mcf_get_first(seq);
2523 else
2524 psf = igmp6_mcf_get_next(seq, v);
2525 ++*pos;
2526 return psf;
2527 }
2528
2529 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2530 __releases(RCU)
2531 {
2532 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2533 if (likely(state->im != NULL)) {
2534 spin_unlock_bh(&state->im->mca_lock);
2535 state->im = NULL;
2536 }
2537 if (likely(state->idev != NULL)) {
2538 read_unlock_bh(&state->idev->lock);
2539 state->idev = NULL;
2540 }
2541 state->dev = NULL;
2542 rcu_read_unlock();
2543 }
2544
2545 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2546 {
2547 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2548 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2549
2550 if (v == SEQ_START_TOKEN) {
2551 seq_printf(seq,
2552 "%3s %6s "
2553 "%32s %32s %6s %6s\n", "Idx",
2554 "Device", "Multicast Address",
2555 "Source Address", "INC", "EXC");
2556 } else {
2557 seq_printf(seq,
2558 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2559 state->dev->ifindex, state->dev->name,
2560 &state->im->mca_addr,
2561 &psf->sf_addr,
2562 psf->sf_count[MCAST_INCLUDE],
2563 psf->sf_count[MCAST_EXCLUDE]);
2564 }
2565 return 0;
2566 }
2567
2568 static const struct seq_operations igmp6_mcf_seq_ops = {
2569 .start = igmp6_mcf_seq_start,
2570 .next = igmp6_mcf_seq_next,
2571 .stop = igmp6_mcf_seq_stop,
2572 .show = igmp6_mcf_seq_show,
2573 };
2574
2575 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2576 {
2577 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2578 sizeof(struct igmp6_mcf_iter_state));
2579 }
2580
2581 static const struct file_operations igmp6_mcf_seq_fops = {
2582 .owner = THIS_MODULE,
2583 .open = igmp6_mcf_seq_open,
2584 .read = seq_read,
2585 .llseek = seq_lseek,
2586 .release = seq_release_net,
2587 };
2588
2589 static int __net_init igmp6_proc_init(struct net *net)
2590 {
2591 int err;
2592
2593 err = -ENOMEM;
2594 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2595 goto out;
2596 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2597 &igmp6_mcf_seq_fops))
2598 goto out_proc_net_igmp6;
2599
2600 err = 0;
2601 out:
2602 return err;
2603
2604 out_proc_net_igmp6:
2605 proc_net_remove(net, "igmp6");
2606 goto out;
2607 }
2608
2609 static void __net_exit igmp6_proc_exit(struct net *net)
2610 {
2611 proc_net_remove(net, "mcfilter6");
2612 proc_net_remove(net, "igmp6");
2613 }
2614 #else
2615 static inline int igmp6_proc_init(struct net *net)
2616 {
2617 return 0;
2618 }
2619 static inline void igmp6_proc_exit(struct net *net)
2620 {
2621 }
2622 #endif
2623
2624 static int __net_init igmp6_net_init(struct net *net)
2625 {
2626 int err;
2627
2628 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2629 SOCK_RAW, IPPROTO_ICMPV6, net);
2630 if (err < 0) {
2631 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2632 err);
2633 goto out;
2634 }
2635
2636 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2637
2638 err = igmp6_proc_init(net);
2639 if (err)
2640 goto out_sock_create;
2641 out:
2642 return err;
2643
2644 out_sock_create:
2645 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2646 goto out;
2647 }
2648
2649 static void __net_exit igmp6_net_exit(struct net *net)
2650 {
2651 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2652 igmp6_proc_exit(net);
2653 }
2654
2655 static struct pernet_operations igmp6_net_ops = {
2656 .init = igmp6_net_init,
2657 .exit = igmp6_net_exit,
2658 };
2659
2660 int __init igmp6_init(void)
2661 {
2662 return register_pernet_subsys(&igmp6_net_ops);
2663 }
2664
2665 void igmp6_cleanup(void)
2666 {
2667 unregister_pernet_subsys(&igmp6_net_ops);
2668 }
kernel source for telekom puls (alcatel/mediatek)