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ipv6: Move xfrm_lookup() call down into icmp6_dst_alloc().
[deliverable/linux.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->rt6i_dev;
166 dst_release(&rt->dst);
167 }
168 } else
169 dev = dev_get_by_index_rcu(net, ifindex);
170
171 if (dev == NULL) {
172 rcu_read_unlock();
173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174 return -ENODEV;
175 }
176
177 mc_lst->ifindex = dev->ifindex;
178 mc_lst->sfmode = MCAST_EXCLUDE;
179 rwlock_init(&mc_lst->sflock);
180 mc_lst->sflist = NULL;
181
182 /*
183 * now add/increase the group membership on the device
184 */
185
186 err = ipv6_dev_mc_inc(dev, addr);
187
188 if (err) {
189 rcu_read_unlock();
190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191 return err;
192 }
193
194 spin_lock(&ipv6_sk_mc_lock);
195 mc_lst->next = np->ipv6_mc_list;
196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 spin_unlock(&ipv6_sk_mc_lock);
198
199 rcu_read_unlock();
200
201 return 0;
202 }
203
204 /*
205 * socket leave on multicast group
206 */
207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 {
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct ipv6_mc_socklist *mc_lst;
211 struct ipv6_mc_socklist __rcu **lnk;
212 struct net *net = sock_net(sk);
213
214 spin_lock(&ipv6_sk_mc_lock);
215 for (lnk = &np->ipv6_mc_list;
216 (mc_lst = rcu_dereference_protected(*lnk,
217 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
218 lnk = &mc_lst->next) {
219 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
220 ipv6_addr_equal(&mc_lst->addr, addr)) {
221 struct net_device *dev;
222
223 *lnk = mc_lst->next;
224 spin_unlock(&ipv6_sk_mc_lock);
225
226 rcu_read_lock();
227 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
228 if (dev != NULL) {
229 struct inet6_dev *idev = __in6_dev_get(dev);
230
231 (void) ip6_mc_leave_src(sk, mc_lst, idev);
232 if (idev)
233 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
234 } else
235 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
236 rcu_read_unlock();
237 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
238 kfree_rcu(mc_lst, rcu);
239 return 0;
240 }
241 }
242 spin_unlock(&ipv6_sk_mc_lock);
243
244 return -EADDRNOTAVAIL;
245 }
246
247 /* called with rcu_read_lock() */
248 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
249 const struct in6_addr *group,
250 int ifindex)
251 {
252 struct net_device *dev = NULL;
253 struct inet6_dev *idev = NULL;
254
255 if (ifindex == 0) {
256 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
257
258 if (rt) {
259 dev = rt->rt6i_dev;
260 dev_hold(dev);
261 dst_release(&rt->dst);
262 }
263 } else
264 dev = dev_get_by_index_rcu(net, ifindex);
265
266 if (!dev)
267 return NULL;
268 idev = __in6_dev_get(dev);
269 if (!idev)
270 return NULL;
271 read_lock_bh(&idev->lock);
272 if (idev->dead) {
273 read_unlock_bh(&idev->lock);
274 return NULL;
275 }
276 return idev;
277 }
278
279 void ipv6_sock_mc_close(struct sock *sk)
280 {
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct ipv6_mc_socklist *mc_lst;
283 struct net *net = sock_net(sk);
284
285 spin_lock(&ipv6_sk_mc_lock);
286 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
287 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
288 struct net_device *dev;
289
290 np->ipv6_mc_list = mc_lst->next;
291 spin_unlock(&ipv6_sk_mc_lock);
292
293 rcu_read_lock();
294 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
295 if (dev) {
296 struct inet6_dev *idev = __in6_dev_get(dev);
297
298 (void) ip6_mc_leave_src(sk, mc_lst, idev);
299 if (idev)
300 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
301 } else
302 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
303 rcu_read_unlock();
304
305 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
306 kfree_rcu(mc_lst, rcu);
307
308 spin_lock(&ipv6_sk_mc_lock);
309 }
310 spin_unlock(&ipv6_sk_mc_lock);
311 }
312
313 int ip6_mc_source(int add, int omode, struct sock *sk,
314 struct group_source_req *pgsr)
315 {
316 struct in6_addr *source, *group;
317 struct ipv6_mc_socklist *pmc;
318 struct inet6_dev *idev;
319 struct ipv6_pinfo *inet6 = inet6_sk(sk);
320 struct ip6_sf_socklist *psl;
321 struct net *net = sock_net(sk);
322 int i, j, rv;
323 int leavegroup = 0;
324 int pmclocked = 0;
325 int err;
326
327 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
328 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
329
330 if (!ipv6_addr_is_multicast(group))
331 return -EINVAL;
332
333 rcu_read_lock();
334 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
335 if (!idev) {
336 rcu_read_unlock();
337 return -ENODEV;
338 }
339
340 err = -EADDRNOTAVAIL;
341
342 for_each_pmc_rcu(inet6, pmc) {
343 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
344 continue;
345 if (ipv6_addr_equal(&pmc->addr, group))
346 break;
347 }
348 if (!pmc) { /* must have a prior join */
349 err = -EINVAL;
350 goto done;
351 }
352 /* if a source filter was set, must be the same mode as before */
353 if (pmc->sflist) {
354 if (pmc->sfmode != omode) {
355 err = -EINVAL;
356 goto done;
357 }
358 } else if (pmc->sfmode != omode) {
359 /* allow mode switches for empty-set filters */
360 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
361 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
362 pmc->sfmode = omode;
363 }
364
365 write_lock(&pmc->sflock);
366 pmclocked = 1;
367
368 psl = pmc->sflist;
369 if (!add) {
370 if (!psl)
371 goto done; /* err = -EADDRNOTAVAIL */
372 rv = !0;
373 for (i=0; i<psl->sl_count; i++) {
374 rv = memcmp(&psl->sl_addr[i], source,
375 sizeof(struct in6_addr));
376 if (rv == 0)
377 break;
378 }
379 if (rv) /* source not found */
380 goto done; /* err = -EADDRNOTAVAIL */
381
382 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
383 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
384 leavegroup = 1;
385 goto done;
386 }
387
388 /* update the interface filter */
389 ip6_mc_del_src(idev, group, omode, 1, source, 1);
390
391 for (j=i+1; j<psl->sl_count; j++)
392 psl->sl_addr[j-1] = psl->sl_addr[j];
393 psl->sl_count--;
394 err = 0;
395 goto done;
396 }
397 /* else, add a new source to the filter */
398
399 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
400 err = -ENOBUFS;
401 goto done;
402 }
403 if (!psl || psl->sl_count == psl->sl_max) {
404 struct ip6_sf_socklist *newpsl;
405 int count = IP6_SFBLOCK;
406
407 if (psl)
408 count += psl->sl_max;
409 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
410 if (!newpsl) {
411 err = -ENOBUFS;
412 goto done;
413 }
414 newpsl->sl_max = count;
415 newpsl->sl_count = count - IP6_SFBLOCK;
416 if (psl) {
417 for (i=0; i<psl->sl_count; i++)
418 newpsl->sl_addr[i] = psl->sl_addr[i];
419 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
420 }
421 pmc->sflist = psl = newpsl;
422 }
423 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
424 for (i=0; i<psl->sl_count; i++) {
425 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
426 if (rv == 0)
427 break;
428 }
429 if (rv == 0) /* address already there is an error */
430 goto done;
431 for (j=psl->sl_count-1; j>=i; j--)
432 psl->sl_addr[j+1] = psl->sl_addr[j];
433 psl->sl_addr[i] = *source;
434 psl->sl_count++;
435 err = 0;
436 /* update the interface list */
437 ip6_mc_add_src(idev, group, omode, 1, source, 1);
438 done:
439 if (pmclocked)
440 write_unlock(&pmc->sflock);
441 read_unlock_bh(&idev->lock);
442 rcu_read_unlock();
443 if (leavegroup)
444 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
445 return err;
446 }
447
448 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
449 {
450 const struct in6_addr *group;
451 struct ipv6_mc_socklist *pmc;
452 struct inet6_dev *idev;
453 struct ipv6_pinfo *inet6 = inet6_sk(sk);
454 struct ip6_sf_socklist *newpsl, *psl;
455 struct net *net = sock_net(sk);
456 int leavegroup = 0;
457 int i, err;
458
459 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
460
461 if (!ipv6_addr_is_multicast(group))
462 return -EINVAL;
463 if (gsf->gf_fmode != MCAST_INCLUDE &&
464 gsf->gf_fmode != MCAST_EXCLUDE)
465 return -EINVAL;
466
467 rcu_read_lock();
468 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
469
470 if (!idev) {
471 rcu_read_unlock();
472 return -ENODEV;
473 }
474
475 err = 0;
476
477 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
478 leavegroup = 1;
479 goto done;
480 }
481
482 for_each_pmc_rcu(inet6, pmc) {
483 if (pmc->ifindex != gsf->gf_interface)
484 continue;
485 if (ipv6_addr_equal(&pmc->addr, group))
486 break;
487 }
488 if (!pmc) { /* must have a prior join */
489 err = -EINVAL;
490 goto done;
491 }
492 if (gsf->gf_numsrc) {
493 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
494 GFP_ATOMIC);
495 if (!newpsl) {
496 err = -ENOBUFS;
497 goto done;
498 }
499 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
500 for (i=0; i<newpsl->sl_count; ++i) {
501 struct sockaddr_in6 *psin6;
502
503 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
504 newpsl->sl_addr[i] = psin6->sin6_addr;
505 }
506 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
507 newpsl->sl_count, newpsl->sl_addr, 0);
508 if (err) {
509 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
510 goto done;
511 }
512 } else {
513 newpsl = NULL;
514 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
515 }
516
517 write_lock(&pmc->sflock);
518 psl = pmc->sflist;
519 if (psl) {
520 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
521 psl->sl_count, psl->sl_addr, 0);
522 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
523 } else
524 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
525 pmc->sflist = newpsl;
526 pmc->sfmode = gsf->gf_fmode;
527 write_unlock(&pmc->sflock);
528 err = 0;
529 done:
530 read_unlock_bh(&idev->lock);
531 rcu_read_unlock();
532 if (leavegroup)
533 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
534 return err;
535 }
536
537 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
538 struct group_filter __user *optval, int __user *optlen)
539 {
540 int err, i, count, copycount;
541 const struct in6_addr *group;
542 struct ipv6_mc_socklist *pmc;
543 struct inet6_dev *idev;
544 struct ipv6_pinfo *inet6 = inet6_sk(sk);
545 struct ip6_sf_socklist *psl;
546 struct net *net = sock_net(sk);
547
548 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
549
550 if (!ipv6_addr_is_multicast(group))
551 return -EINVAL;
552
553 rcu_read_lock();
554 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
555
556 if (!idev) {
557 rcu_read_unlock();
558 return -ENODEV;
559 }
560
561 err = -EADDRNOTAVAIL;
562 /*
563 * changes to the ipv6_mc_list require the socket lock and
564 * a read lock on ip6_sk_mc_lock. We have the socket lock,
565 * so reading the list is safe.
566 */
567
568 for_each_pmc_rcu(inet6, pmc) {
569 if (pmc->ifindex != gsf->gf_interface)
570 continue;
571 if (ipv6_addr_equal(group, &pmc->addr))
572 break;
573 }
574 if (!pmc) /* must have a prior join */
575 goto done;
576 gsf->gf_fmode = pmc->sfmode;
577 psl = pmc->sflist;
578 count = psl ? psl->sl_count : 0;
579 read_unlock_bh(&idev->lock);
580 rcu_read_unlock();
581
582 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
583 gsf->gf_numsrc = count;
584 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
585 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
586 return -EFAULT;
587 }
588 /* changes to psl require the socket lock, a read lock on
589 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
590 * have the socket lock, so reading here is safe.
591 */
592 for (i=0; i<copycount; i++) {
593 struct sockaddr_in6 *psin6;
594 struct sockaddr_storage ss;
595
596 psin6 = (struct sockaddr_in6 *)&ss;
597 memset(&ss, 0, sizeof(ss));
598 psin6->sin6_family = AF_INET6;
599 psin6->sin6_addr = psl->sl_addr[i];
600 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
601 return -EFAULT;
602 }
603 return 0;
604 done:
605 read_unlock_bh(&idev->lock);
606 rcu_read_unlock();
607 return err;
608 }
609
610 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
611 const struct in6_addr *src_addr)
612 {
613 struct ipv6_pinfo *np = inet6_sk(sk);
614 struct ipv6_mc_socklist *mc;
615 struct ip6_sf_socklist *psl;
616 int rv = 1;
617
618 rcu_read_lock();
619 for_each_pmc_rcu(np, mc) {
620 if (ipv6_addr_equal(&mc->addr, mc_addr))
621 break;
622 }
623 if (!mc) {
624 rcu_read_unlock();
625 return 1;
626 }
627 read_lock(&mc->sflock);
628 psl = mc->sflist;
629 if (!psl) {
630 rv = mc->sfmode == MCAST_EXCLUDE;
631 } else {
632 int i;
633
634 for (i=0; i<psl->sl_count; i++) {
635 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
636 break;
637 }
638 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
639 rv = 0;
640 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
641 rv = 0;
642 }
643 read_unlock(&mc->sflock);
644 rcu_read_unlock();
645
646 return rv;
647 }
648
649 static void ma_put(struct ifmcaddr6 *mc)
650 {
651 if (atomic_dec_and_test(&mc->mca_refcnt)) {
652 in6_dev_put(mc->idev);
653 kfree(mc);
654 }
655 }
656
657 static void igmp6_group_added(struct ifmcaddr6 *mc)
658 {
659 struct net_device *dev = mc->idev->dev;
660 char buf[MAX_ADDR_LEN];
661
662 spin_lock_bh(&mc->mca_lock);
663 if (!(mc->mca_flags&MAF_LOADED)) {
664 mc->mca_flags |= MAF_LOADED;
665 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
666 dev_mc_add(dev, buf);
667 }
668 spin_unlock_bh(&mc->mca_lock);
669
670 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
671 return;
672
673 if (MLD_V1_SEEN(mc->idev)) {
674 igmp6_join_group(mc);
675 return;
676 }
677 /* else v2 */
678
679 mc->mca_crcount = mc->idev->mc_qrv;
680 mld_ifc_event(mc->idev);
681 }
682
683 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
684 {
685 struct net_device *dev = mc->idev->dev;
686 char buf[MAX_ADDR_LEN];
687
688 spin_lock_bh(&mc->mca_lock);
689 if (mc->mca_flags&MAF_LOADED) {
690 mc->mca_flags &= ~MAF_LOADED;
691 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
692 dev_mc_del(dev, buf);
693 }
694
695 if (mc->mca_flags & MAF_NOREPORT)
696 goto done;
697 spin_unlock_bh(&mc->mca_lock);
698
699 if (!mc->idev->dead)
700 igmp6_leave_group(mc);
701
702 spin_lock_bh(&mc->mca_lock);
703 if (del_timer(&mc->mca_timer))
704 atomic_dec(&mc->mca_refcnt);
705 done:
706 ip6_mc_clear_src(mc);
707 spin_unlock_bh(&mc->mca_lock);
708 }
709
710 /*
711 * deleted ifmcaddr6 manipulation
712 */
713 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
714 {
715 struct ifmcaddr6 *pmc;
716
717 /* this is an "ifmcaddr6" for convenience; only the fields below
718 * are actually used. In particular, the refcnt and users are not
719 * used for management of the delete list. Using the same structure
720 * for deleted items allows change reports to use common code with
721 * non-deleted or query-response MCA's.
722 */
723 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
724 if (!pmc)
725 return;
726
727 spin_lock_bh(&im->mca_lock);
728 spin_lock_init(&pmc->mca_lock);
729 pmc->idev = im->idev;
730 in6_dev_hold(idev);
731 pmc->mca_addr = im->mca_addr;
732 pmc->mca_crcount = idev->mc_qrv;
733 pmc->mca_sfmode = im->mca_sfmode;
734 if (pmc->mca_sfmode == MCAST_INCLUDE) {
735 struct ip6_sf_list *psf;
736
737 pmc->mca_tomb = im->mca_tomb;
738 pmc->mca_sources = im->mca_sources;
739 im->mca_tomb = im->mca_sources = NULL;
740 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
741 psf->sf_crcount = pmc->mca_crcount;
742 }
743 spin_unlock_bh(&im->mca_lock);
744
745 spin_lock_bh(&idev->mc_lock);
746 pmc->next = idev->mc_tomb;
747 idev->mc_tomb = pmc;
748 spin_unlock_bh(&idev->mc_lock);
749 }
750
751 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
752 {
753 struct ifmcaddr6 *pmc, *pmc_prev;
754 struct ip6_sf_list *psf, *psf_next;
755
756 spin_lock_bh(&idev->mc_lock);
757 pmc_prev = NULL;
758 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
759 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
760 break;
761 pmc_prev = pmc;
762 }
763 if (pmc) {
764 if (pmc_prev)
765 pmc_prev->next = pmc->next;
766 else
767 idev->mc_tomb = pmc->next;
768 }
769 spin_unlock_bh(&idev->mc_lock);
770
771 if (pmc) {
772 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
773 psf_next = psf->sf_next;
774 kfree(psf);
775 }
776 in6_dev_put(pmc->idev);
777 kfree(pmc);
778 }
779 }
780
781 static void mld_clear_delrec(struct inet6_dev *idev)
782 {
783 struct ifmcaddr6 *pmc, *nextpmc;
784
785 spin_lock_bh(&idev->mc_lock);
786 pmc = idev->mc_tomb;
787 idev->mc_tomb = NULL;
788 spin_unlock_bh(&idev->mc_lock);
789
790 for (; pmc; pmc = nextpmc) {
791 nextpmc = pmc->next;
792 ip6_mc_clear_src(pmc);
793 in6_dev_put(pmc->idev);
794 kfree(pmc);
795 }
796
797 /* clear dead sources, too */
798 read_lock_bh(&idev->lock);
799 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
800 struct ip6_sf_list *psf, *psf_next;
801
802 spin_lock_bh(&pmc->mca_lock);
803 psf = pmc->mca_tomb;
804 pmc->mca_tomb = NULL;
805 spin_unlock_bh(&pmc->mca_lock);
806 for (; psf; psf=psf_next) {
807 psf_next = psf->sf_next;
808 kfree(psf);
809 }
810 }
811 read_unlock_bh(&idev->lock);
812 }
813
814
815 /*
816 * device multicast group inc (add if not found)
817 */
818 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
819 {
820 struct ifmcaddr6 *mc;
821 struct inet6_dev *idev;
822
823 /* we need to take a reference on idev */
824 idev = in6_dev_get(dev);
825
826 if (idev == NULL)
827 return -EINVAL;
828
829 write_lock_bh(&idev->lock);
830 if (idev->dead) {
831 write_unlock_bh(&idev->lock);
832 in6_dev_put(idev);
833 return -ENODEV;
834 }
835
836 for (mc = idev->mc_list; mc; mc = mc->next) {
837 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
838 mc->mca_users++;
839 write_unlock_bh(&idev->lock);
840 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
841 NULL, 0);
842 in6_dev_put(idev);
843 return 0;
844 }
845 }
846
847 /*
848 * not found: create a new one.
849 */
850
851 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
852
853 if (mc == NULL) {
854 write_unlock_bh(&idev->lock);
855 in6_dev_put(idev);
856 return -ENOMEM;
857 }
858
859 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
860
861 mc->mca_addr = *addr;
862 mc->idev = idev; /* (reference taken) */
863 mc->mca_users = 1;
864 /* mca_stamp should be updated upon changes */
865 mc->mca_cstamp = mc->mca_tstamp = jiffies;
866 atomic_set(&mc->mca_refcnt, 2);
867 spin_lock_init(&mc->mca_lock);
868
869 /* initial mode is (EX, empty) */
870 mc->mca_sfmode = MCAST_EXCLUDE;
871 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
872
873 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
874 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
875 mc->mca_flags |= MAF_NOREPORT;
876
877 mc->next = idev->mc_list;
878 idev->mc_list = mc;
879 write_unlock_bh(&idev->lock);
880
881 mld_del_delrec(idev, &mc->mca_addr);
882 igmp6_group_added(mc);
883 ma_put(mc);
884 return 0;
885 }
886
887 /*
888 * device multicast group del
889 */
890 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
891 {
892 struct ifmcaddr6 *ma, **map;
893
894 write_lock_bh(&idev->lock);
895 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
896 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
897 if (--ma->mca_users == 0) {
898 *map = ma->next;
899 write_unlock_bh(&idev->lock);
900
901 igmp6_group_dropped(ma);
902
903 ma_put(ma);
904 return 0;
905 }
906 write_unlock_bh(&idev->lock);
907 return 0;
908 }
909 }
910 write_unlock_bh(&idev->lock);
911
912 return -ENOENT;
913 }
914
915 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
916 {
917 struct inet6_dev *idev;
918 int err;
919
920 rcu_read_lock();
921
922 idev = __in6_dev_get(dev);
923 if (!idev)
924 err = -ENODEV;
925 else
926 err = __ipv6_dev_mc_dec(idev, addr);
927
928 rcu_read_unlock();
929 return err;
930 }
931
932 /*
933 * identify MLD packets for MLD filter exceptions
934 */
935 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
936 {
937 struct icmp6hdr *pic;
938
939 if (nexthdr != IPPROTO_ICMPV6)
940 return 0;
941
942 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
943 return 0;
944
945 pic = icmp6_hdr(skb);
946
947 switch (pic->icmp6_type) {
948 case ICMPV6_MGM_QUERY:
949 case ICMPV6_MGM_REPORT:
950 case ICMPV6_MGM_REDUCTION:
951 case ICMPV6_MLD2_REPORT:
952 return 1;
953 default:
954 break;
955 }
956 return 0;
957 }
958
959 /*
960 * check if the interface/address pair is valid
961 */
962 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
963 const struct in6_addr *src_addr)
964 {
965 struct inet6_dev *idev;
966 struct ifmcaddr6 *mc;
967 int rv = 0;
968
969 rcu_read_lock();
970 idev = __in6_dev_get(dev);
971 if (idev) {
972 read_lock_bh(&idev->lock);
973 for (mc = idev->mc_list; mc; mc=mc->next) {
974 if (ipv6_addr_equal(&mc->mca_addr, group))
975 break;
976 }
977 if (mc) {
978 if (src_addr && !ipv6_addr_any(src_addr)) {
979 struct ip6_sf_list *psf;
980
981 spin_lock_bh(&mc->mca_lock);
982 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
983 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
984 break;
985 }
986 if (psf)
987 rv = psf->sf_count[MCAST_INCLUDE] ||
988 psf->sf_count[MCAST_EXCLUDE] !=
989 mc->mca_sfcount[MCAST_EXCLUDE];
990 else
991 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
992 spin_unlock_bh(&mc->mca_lock);
993 } else
994 rv = 1; /* don't filter unspecified source */
995 }
996 read_unlock_bh(&idev->lock);
997 }
998 rcu_read_unlock();
999 return rv;
1000 }
1001
1002 static void mld_gq_start_timer(struct inet6_dev *idev)
1003 {
1004 int tv = net_random() % idev->mc_maxdelay;
1005
1006 idev->mc_gq_running = 1;
1007 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1008 in6_dev_hold(idev);
1009 }
1010
1011 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1012 {
1013 int tv = net_random() % delay;
1014
1015 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1016 in6_dev_hold(idev);
1017 }
1018
1019 /*
1020 * IGMP handling (alias multicast ICMPv6 messages)
1021 */
1022
1023 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1024 {
1025 unsigned long delay = resptime;
1026
1027 /* Do not start timer for these addresses */
1028 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1029 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1030 return;
1031
1032 if (del_timer(&ma->mca_timer)) {
1033 atomic_dec(&ma->mca_refcnt);
1034 delay = ma->mca_timer.expires - jiffies;
1035 }
1036
1037 if (delay >= resptime) {
1038 if (resptime)
1039 delay = net_random() % resptime;
1040 else
1041 delay = 1;
1042 }
1043 ma->mca_timer.expires = jiffies + delay;
1044 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1045 atomic_inc(&ma->mca_refcnt);
1046 ma->mca_flags |= MAF_TIMER_RUNNING;
1047 }
1048
1049 /* mark EXCLUDE-mode sources */
1050 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1051 const struct in6_addr *srcs)
1052 {
1053 struct ip6_sf_list *psf;
1054 int i, scount;
1055
1056 scount = 0;
1057 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1058 if (scount == nsrcs)
1059 break;
1060 for (i=0; i<nsrcs; i++) {
1061 /* skip inactive filters */
1062 if (psf->sf_count[MCAST_INCLUDE] ||
1063 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1064 psf->sf_count[MCAST_EXCLUDE])
1065 continue;
1066 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1067 scount++;
1068 break;
1069 }
1070 }
1071 }
1072 pmc->mca_flags &= ~MAF_GSQUERY;
1073 if (scount == nsrcs) /* all sources excluded */
1074 return 0;
1075 return 1;
1076 }
1077
1078 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1079 const struct in6_addr *srcs)
1080 {
1081 struct ip6_sf_list *psf;
1082 int i, scount;
1083
1084 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1085 return mld_xmarksources(pmc, nsrcs, srcs);
1086
1087 /* mark INCLUDE-mode sources */
1088
1089 scount = 0;
1090 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1091 if (scount == nsrcs)
1092 break;
1093 for (i=0; i<nsrcs; i++) {
1094 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1095 psf->sf_gsresp = 1;
1096 scount++;
1097 break;
1098 }
1099 }
1100 }
1101 if (!scount) {
1102 pmc->mca_flags &= ~MAF_GSQUERY;
1103 return 0;
1104 }
1105 pmc->mca_flags |= MAF_GSQUERY;
1106 return 1;
1107 }
1108
1109 /* called with rcu_read_lock() */
1110 int igmp6_event_query(struct sk_buff *skb)
1111 {
1112 struct mld2_query *mlh2 = NULL;
1113 struct ifmcaddr6 *ma;
1114 const struct in6_addr *group;
1115 unsigned long max_delay;
1116 struct inet6_dev *idev;
1117 struct mld_msg *mld;
1118 int group_type;
1119 int mark = 0;
1120 int len;
1121
1122 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1123 return -EINVAL;
1124
1125 /* compute payload length excluding extension headers */
1126 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1127 len -= skb_network_header_len(skb);
1128
1129 /* Drop queries with not link local source */
1130 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1131 return -EINVAL;
1132
1133 idev = __in6_dev_get(skb->dev);
1134
1135 if (idev == NULL)
1136 return 0;
1137
1138 mld = (struct mld_msg *)icmp6_hdr(skb);
1139 group = &mld->mld_mca;
1140 group_type = ipv6_addr_type(group);
1141
1142 if (group_type != IPV6_ADDR_ANY &&
1143 !(group_type&IPV6_ADDR_MULTICAST))
1144 return -EINVAL;
1145
1146 if (len == 24) {
1147 int switchback;
1148 /* MLDv1 router present */
1149
1150 /* Translate milliseconds to jiffies */
1151 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1152
1153 switchback = (idev->mc_qrv + 1) * max_delay;
1154 idev->mc_v1_seen = jiffies + switchback;
1155
1156 /* cancel the interface change timer */
1157 idev->mc_ifc_count = 0;
1158 if (del_timer(&idev->mc_ifc_timer))
1159 __in6_dev_put(idev);
1160 /* clear deleted report items */
1161 mld_clear_delrec(idev);
1162 } else if (len >= 28) {
1163 int srcs_offset = sizeof(struct mld2_query) -
1164 sizeof(struct icmp6hdr);
1165 if (!pskb_may_pull(skb, srcs_offset))
1166 return -EINVAL;
1167
1168 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1169 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1170 if (!max_delay)
1171 max_delay = 1;
1172 idev->mc_maxdelay = max_delay;
1173 if (mlh2->mld2q_qrv)
1174 idev->mc_qrv = mlh2->mld2q_qrv;
1175 if (group_type == IPV6_ADDR_ANY) { /* general query */
1176 if (mlh2->mld2q_nsrcs)
1177 return -EINVAL; /* no sources allowed */
1178
1179 mld_gq_start_timer(idev);
1180 return 0;
1181 }
1182 /* mark sources to include, if group & source-specific */
1183 if (mlh2->mld2q_nsrcs != 0) {
1184 if (!pskb_may_pull(skb, srcs_offset +
1185 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1186 return -EINVAL;
1187
1188 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1189 mark = 1;
1190 }
1191 } else
1192 return -EINVAL;
1193
1194 read_lock_bh(&idev->lock);
1195 if (group_type == IPV6_ADDR_ANY) {
1196 for (ma = idev->mc_list; ma; ma=ma->next) {
1197 spin_lock_bh(&ma->mca_lock);
1198 igmp6_group_queried(ma, max_delay);
1199 spin_unlock_bh(&ma->mca_lock);
1200 }
1201 } else {
1202 for (ma = idev->mc_list; ma; ma=ma->next) {
1203 if (!ipv6_addr_equal(group, &ma->mca_addr))
1204 continue;
1205 spin_lock_bh(&ma->mca_lock);
1206 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1207 /* gsquery <- gsquery && mark */
1208 if (!mark)
1209 ma->mca_flags &= ~MAF_GSQUERY;
1210 } else {
1211 /* gsquery <- mark */
1212 if (mark)
1213 ma->mca_flags |= MAF_GSQUERY;
1214 else
1215 ma->mca_flags &= ~MAF_GSQUERY;
1216 }
1217 if (!(ma->mca_flags & MAF_GSQUERY) ||
1218 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1219 igmp6_group_queried(ma, max_delay);
1220 spin_unlock_bh(&ma->mca_lock);
1221 break;
1222 }
1223 }
1224 read_unlock_bh(&idev->lock);
1225
1226 return 0;
1227 }
1228
1229 /* called with rcu_read_lock() */
1230 int igmp6_event_report(struct sk_buff *skb)
1231 {
1232 struct ifmcaddr6 *ma;
1233 struct inet6_dev *idev;
1234 struct mld_msg *mld;
1235 int addr_type;
1236
1237 /* Our own report looped back. Ignore it. */
1238 if (skb->pkt_type == PACKET_LOOPBACK)
1239 return 0;
1240
1241 /* send our report if the MC router may not have heard this report */
1242 if (skb->pkt_type != PACKET_MULTICAST &&
1243 skb->pkt_type != PACKET_BROADCAST)
1244 return 0;
1245
1246 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1247 return -EINVAL;
1248
1249 mld = (struct mld_msg *)icmp6_hdr(skb);
1250
1251 /* Drop reports with not link local source */
1252 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1253 if (addr_type != IPV6_ADDR_ANY &&
1254 !(addr_type&IPV6_ADDR_LINKLOCAL))
1255 return -EINVAL;
1256
1257 idev = __in6_dev_get(skb->dev);
1258 if (idev == NULL)
1259 return -ENODEV;
1260
1261 /*
1262 * Cancel the timer for this group
1263 */
1264
1265 read_lock_bh(&idev->lock);
1266 for (ma = idev->mc_list; ma; ma=ma->next) {
1267 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1268 spin_lock(&ma->mca_lock);
1269 if (del_timer(&ma->mca_timer))
1270 atomic_dec(&ma->mca_refcnt);
1271 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1272 spin_unlock(&ma->mca_lock);
1273 break;
1274 }
1275 }
1276 read_unlock_bh(&idev->lock);
1277 return 0;
1278 }
1279
1280 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1281 int gdeleted, int sdeleted)
1282 {
1283 switch (type) {
1284 case MLD2_MODE_IS_INCLUDE:
1285 case MLD2_MODE_IS_EXCLUDE:
1286 if (gdeleted || sdeleted)
1287 return 0;
1288 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1289 if (pmc->mca_sfmode == MCAST_INCLUDE)
1290 return 1;
1291 /* don't include if this source is excluded
1292 * in all filters
1293 */
1294 if (psf->sf_count[MCAST_INCLUDE])
1295 return type == MLD2_MODE_IS_INCLUDE;
1296 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1297 psf->sf_count[MCAST_EXCLUDE];
1298 }
1299 return 0;
1300 case MLD2_CHANGE_TO_INCLUDE:
1301 if (gdeleted || sdeleted)
1302 return 0;
1303 return psf->sf_count[MCAST_INCLUDE] != 0;
1304 case MLD2_CHANGE_TO_EXCLUDE:
1305 if (gdeleted || sdeleted)
1306 return 0;
1307 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1308 psf->sf_count[MCAST_INCLUDE])
1309 return 0;
1310 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1311 psf->sf_count[MCAST_EXCLUDE];
1312 case MLD2_ALLOW_NEW_SOURCES:
1313 if (gdeleted || !psf->sf_crcount)
1314 return 0;
1315 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1316 case MLD2_BLOCK_OLD_SOURCES:
1317 if (pmc->mca_sfmode == MCAST_INCLUDE)
1318 return gdeleted || (psf->sf_crcount && sdeleted);
1319 return psf->sf_crcount && !gdeleted && !sdeleted;
1320 }
1321 return 0;
1322 }
1323
1324 static int
1325 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1326 {
1327 struct ip6_sf_list *psf;
1328 int scount = 0;
1329
1330 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1331 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1332 continue;
1333 scount++;
1334 }
1335 return scount;
1336 }
1337
1338 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1339 {
1340 struct net *net = dev_net(dev);
1341 struct sock *sk = net->ipv6.igmp_sk;
1342 struct sk_buff *skb;
1343 struct mld2_report *pmr;
1344 struct in6_addr addr_buf;
1345 const struct in6_addr *saddr;
1346 int hlen = LL_RESERVED_SPACE(dev);
1347 int tlen = dev->needed_tailroom;
1348 int err;
1349 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1350 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1351 IPV6_TLV_PADN, 0 };
1352
1353 /* we assume size > sizeof(ra) here */
1354 size += hlen + tlen;
1355 /* limit our allocations to order-0 page */
1356 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1357 skb = sock_alloc_send_skb(sk, size, 1, &err);
1358
1359 if (!skb)
1360 return NULL;
1361
1362 skb_reserve(skb, hlen);
1363
1364 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1365 /* <draft-ietf-magma-mld-source-05.txt>:
1366 * use unspecified address as the source address
1367 * when a valid link-local address is not available.
1368 */
1369 saddr = &in6addr_any;
1370 } else
1371 saddr = &addr_buf;
1372
1373 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1374
1375 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1376
1377 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1378 skb_put(skb, sizeof(*pmr));
1379 pmr = (struct mld2_report *)skb_transport_header(skb);
1380 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1381 pmr->mld2r_resv1 = 0;
1382 pmr->mld2r_cksum = 0;
1383 pmr->mld2r_resv2 = 0;
1384 pmr->mld2r_ngrec = 0;
1385 return skb;
1386 }
1387
1388 static void mld_sendpack(struct sk_buff *skb)
1389 {
1390 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1391 struct mld2_report *pmr =
1392 (struct mld2_report *)skb_transport_header(skb);
1393 int payload_len, mldlen;
1394 struct inet6_dev *idev;
1395 struct net *net = dev_net(skb->dev);
1396 int err;
1397 struct flowi6 fl6;
1398 struct dst_entry *dst;
1399
1400 rcu_read_lock();
1401 idev = __in6_dev_get(skb->dev);
1402 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1403
1404 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1405 mldlen = skb->tail - skb->transport_header;
1406 pip6->payload_len = htons(payload_len);
1407
1408 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1409 IPPROTO_ICMPV6,
1410 csum_partial(skb_transport_header(skb),
1411 mldlen, 0));
1412
1413 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, NULL, &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_nd_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, NULL, &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 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2049 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2050 struct ip6_sf_list *psf;
2051
2052 /* filter mode change */
2053 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2054 pmc->mca_sfmode = MCAST_EXCLUDE;
2055 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2056 pmc->mca_sfmode = MCAST_INCLUDE;
2057 /* else no filters; keep old mode for reports */
2058
2059 pmc->mca_crcount = idev->mc_qrv;
2060 idev->mc_ifc_count = pmc->mca_crcount;
2061 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2062 psf->sf_crcount = 0;
2063 mld_ifc_event(idev);
2064 } else if (sf_setstate(pmc))
2065 mld_ifc_event(idev);
2066 spin_unlock_bh(&pmc->mca_lock);
2067 read_unlock_bh(&idev->lock);
2068 return err;
2069 }
2070
2071 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2072 {
2073 struct ip6_sf_list *psf, *nextpsf;
2074
2075 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2076 nextpsf = psf->sf_next;
2077 kfree(psf);
2078 }
2079 pmc->mca_tomb = NULL;
2080 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2081 nextpsf = psf->sf_next;
2082 kfree(psf);
2083 }
2084 pmc->mca_sources = NULL;
2085 pmc->mca_sfmode = MCAST_EXCLUDE;
2086 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2087 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2088 }
2089
2090
2091 static void igmp6_join_group(struct ifmcaddr6 *ma)
2092 {
2093 unsigned long delay;
2094
2095 if (ma->mca_flags & MAF_NOREPORT)
2096 return;
2097
2098 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2099
2100 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2101
2102 spin_lock_bh(&ma->mca_lock);
2103 if (del_timer(&ma->mca_timer)) {
2104 atomic_dec(&ma->mca_refcnt);
2105 delay = ma->mca_timer.expires - jiffies;
2106 }
2107
2108 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2109 atomic_inc(&ma->mca_refcnt);
2110 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2111 spin_unlock_bh(&ma->mca_lock);
2112 }
2113
2114 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2115 struct inet6_dev *idev)
2116 {
2117 int err;
2118
2119 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2120 * so no other readers or writers of iml or its sflist
2121 */
2122 if (!iml->sflist) {
2123 /* any-source empty exclude case */
2124 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2125 }
2126 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2127 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2128 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2129 iml->sflist = NULL;
2130 return err;
2131 }
2132
2133 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2134 {
2135 if (MLD_V1_SEEN(ma->idev)) {
2136 if (ma->mca_flags & MAF_LAST_REPORTER)
2137 igmp6_send(&ma->mca_addr, ma->idev->dev,
2138 ICMPV6_MGM_REDUCTION);
2139 } else {
2140 mld_add_delrec(ma->idev, ma);
2141 mld_ifc_event(ma->idev);
2142 }
2143 }
2144
2145 static void mld_gq_timer_expire(unsigned long data)
2146 {
2147 struct inet6_dev *idev = (struct inet6_dev *)data;
2148
2149 idev->mc_gq_running = 0;
2150 mld_send_report(idev, NULL);
2151 __in6_dev_put(idev);
2152 }
2153
2154 static void mld_ifc_timer_expire(unsigned long data)
2155 {
2156 struct inet6_dev *idev = (struct inet6_dev *)data;
2157
2158 mld_send_cr(idev);
2159 if (idev->mc_ifc_count) {
2160 idev->mc_ifc_count--;
2161 if (idev->mc_ifc_count)
2162 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2163 }
2164 __in6_dev_put(idev);
2165 }
2166
2167 static void mld_ifc_event(struct inet6_dev *idev)
2168 {
2169 if (MLD_V1_SEEN(idev))
2170 return;
2171 idev->mc_ifc_count = idev->mc_qrv;
2172 mld_ifc_start_timer(idev, 1);
2173 }
2174
2175
2176 static void igmp6_timer_handler(unsigned long data)
2177 {
2178 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2179
2180 if (MLD_V1_SEEN(ma->idev))
2181 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2182 else
2183 mld_send_report(ma->idev, ma);
2184
2185 spin_lock(&ma->mca_lock);
2186 ma->mca_flags |= MAF_LAST_REPORTER;
2187 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2188 spin_unlock(&ma->mca_lock);
2189 ma_put(ma);
2190 }
2191
2192 /* Device changing type */
2193
2194 void ipv6_mc_unmap(struct inet6_dev *idev)
2195 {
2196 struct ifmcaddr6 *i;
2197
2198 /* Install multicast list, except for all-nodes (already installed) */
2199
2200 read_lock_bh(&idev->lock);
2201 for (i = idev->mc_list; i; i = i->next)
2202 igmp6_group_dropped(i);
2203 read_unlock_bh(&idev->lock);
2204 }
2205
2206 void ipv6_mc_remap(struct inet6_dev *idev)
2207 {
2208 ipv6_mc_up(idev);
2209 }
2210
2211 /* Device going down */
2212
2213 void ipv6_mc_down(struct inet6_dev *idev)
2214 {
2215 struct ifmcaddr6 *i;
2216
2217 /* Withdraw multicast list */
2218
2219 read_lock_bh(&idev->lock);
2220 idev->mc_ifc_count = 0;
2221 if (del_timer(&idev->mc_ifc_timer))
2222 __in6_dev_put(idev);
2223 idev->mc_gq_running = 0;
2224 if (del_timer(&idev->mc_gq_timer))
2225 __in6_dev_put(idev);
2226
2227 for (i = idev->mc_list; i; i=i->next)
2228 igmp6_group_dropped(i);
2229 read_unlock_bh(&idev->lock);
2230
2231 mld_clear_delrec(idev);
2232 }
2233
2234
2235 /* Device going up */
2236
2237 void ipv6_mc_up(struct inet6_dev *idev)
2238 {
2239 struct ifmcaddr6 *i;
2240
2241 /* Install multicast list, except for all-nodes (already installed) */
2242
2243 read_lock_bh(&idev->lock);
2244 for (i = idev->mc_list; i; i=i->next)
2245 igmp6_group_added(i);
2246 read_unlock_bh(&idev->lock);
2247 }
2248
2249 /* IPv6 device initialization. */
2250
2251 void ipv6_mc_init_dev(struct inet6_dev *idev)
2252 {
2253 write_lock_bh(&idev->lock);
2254 spin_lock_init(&idev->mc_lock);
2255 idev->mc_gq_running = 0;
2256 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2257 (unsigned long)idev);
2258 idev->mc_tomb = NULL;
2259 idev->mc_ifc_count = 0;
2260 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2261 (unsigned long)idev);
2262 idev->mc_qrv = MLD_QRV_DEFAULT;
2263 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2264 idev->mc_v1_seen = 0;
2265 write_unlock_bh(&idev->lock);
2266 }
2267
2268 /*
2269 * Device is about to be destroyed: clean up.
2270 */
2271
2272 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2273 {
2274 struct ifmcaddr6 *i;
2275
2276 /* Deactivate timers */
2277 ipv6_mc_down(idev);
2278
2279 /* Delete all-nodes address. */
2280 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2281 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2282 * fail.
2283 */
2284 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2285
2286 if (idev->cnf.forwarding)
2287 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2288
2289 write_lock_bh(&idev->lock);
2290 while ((i = idev->mc_list) != NULL) {
2291 idev->mc_list = i->next;
2292 write_unlock_bh(&idev->lock);
2293
2294 igmp6_group_dropped(i);
2295 ma_put(i);
2296
2297 write_lock_bh(&idev->lock);
2298 }
2299 write_unlock_bh(&idev->lock);
2300 }
2301
2302 #ifdef CONFIG_PROC_FS
2303 struct igmp6_mc_iter_state {
2304 struct seq_net_private p;
2305 struct net_device *dev;
2306 struct inet6_dev *idev;
2307 };
2308
2309 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2310
2311 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2312 {
2313 struct ifmcaddr6 *im = NULL;
2314 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2315 struct net *net = seq_file_net(seq);
2316
2317 state->idev = NULL;
2318 for_each_netdev_rcu(net, state->dev) {
2319 struct inet6_dev *idev;
2320 idev = __in6_dev_get(state->dev);
2321 if (!idev)
2322 continue;
2323 read_lock_bh(&idev->lock);
2324 im = idev->mc_list;
2325 if (im) {
2326 state->idev = idev;
2327 break;
2328 }
2329 read_unlock_bh(&idev->lock);
2330 }
2331 return im;
2332 }
2333
2334 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2335 {
2336 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2337
2338 im = im->next;
2339 while (!im) {
2340 if (likely(state->idev != NULL))
2341 read_unlock_bh(&state->idev->lock);
2342
2343 state->dev = next_net_device_rcu(state->dev);
2344 if (!state->dev) {
2345 state->idev = NULL;
2346 break;
2347 }
2348 state->idev = __in6_dev_get(state->dev);
2349 if (!state->idev)
2350 continue;
2351 read_lock_bh(&state->idev->lock);
2352 im = state->idev->mc_list;
2353 }
2354 return im;
2355 }
2356
2357 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2358 {
2359 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2360 if (im)
2361 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2362 --pos;
2363 return pos ? NULL : im;
2364 }
2365
2366 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2367 __acquires(RCU)
2368 {
2369 rcu_read_lock();
2370 return igmp6_mc_get_idx(seq, *pos);
2371 }
2372
2373 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2374 {
2375 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2376
2377 ++*pos;
2378 return im;
2379 }
2380
2381 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2382 __releases(RCU)
2383 {
2384 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2385
2386 if (likely(state->idev != NULL)) {
2387 read_unlock_bh(&state->idev->lock);
2388 state->idev = NULL;
2389 }
2390 state->dev = NULL;
2391 rcu_read_unlock();
2392 }
2393
2394 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2395 {
2396 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2397 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2398
2399 seq_printf(seq,
2400 "%-4d %-15s %pi6 %5d %08X %ld\n",
2401 state->dev->ifindex, state->dev->name,
2402 &im->mca_addr,
2403 im->mca_users, im->mca_flags,
2404 (im->mca_flags&MAF_TIMER_RUNNING) ?
2405 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2406 return 0;
2407 }
2408
2409 static const struct seq_operations igmp6_mc_seq_ops = {
2410 .start = igmp6_mc_seq_start,
2411 .next = igmp6_mc_seq_next,
2412 .stop = igmp6_mc_seq_stop,
2413 .show = igmp6_mc_seq_show,
2414 };
2415
2416 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2417 {
2418 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2419 sizeof(struct igmp6_mc_iter_state));
2420 }
2421
2422 static const struct file_operations igmp6_mc_seq_fops = {
2423 .owner = THIS_MODULE,
2424 .open = igmp6_mc_seq_open,
2425 .read = seq_read,
2426 .llseek = seq_lseek,
2427 .release = seq_release_net,
2428 };
2429
2430 struct igmp6_mcf_iter_state {
2431 struct seq_net_private p;
2432 struct net_device *dev;
2433 struct inet6_dev *idev;
2434 struct ifmcaddr6 *im;
2435 };
2436
2437 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2438
2439 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2440 {
2441 struct ip6_sf_list *psf = NULL;
2442 struct ifmcaddr6 *im = NULL;
2443 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2444 struct net *net = seq_file_net(seq);
2445
2446 state->idev = NULL;
2447 state->im = NULL;
2448 for_each_netdev_rcu(net, state->dev) {
2449 struct inet6_dev *idev;
2450 idev = __in6_dev_get(state->dev);
2451 if (unlikely(idev == NULL))
2452 continue;
2453 read_lock_bh(&idev->lock);
2454 im = idev->mc_list;
2455 if (likely(im != NULL)) {
2456 spin_lock_bh(&im->mca_lock);
2457 psf = im->mca_sources;
2458 if (likely(psf != NULL)) {
2459 state->im = im;
2460 state->idev = idev;
2461 break;
2462 }
2463 spin_unlock_bh(&im->mca_lock);
2464 }
2465 read_unlock_bh(&idev->lock);
2466 }
2467 return psf;
2468 }
2469
2470 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2471 {
2472 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2473
2474 psf = psf->sf_next;
2475 while (!psf) {
2476 spin_unlock_bh(&state->im->mca_lock);
2477 state->im = state->im->next;
2478 while (!state->im) {
2479 if (likely(state->idev != NULL))
2480 read_unlock_bh(&state->idev->lock);
2481
2482 state->dev = next_net_device_rcu(state->dev);
2483 if (!state->dev) {
2484 state->idev = NULL;
2485 goto out;
2486 }
2487 state->idev = __in6_dev_get(state->dev);
2488 if (!state->idev)
2489 continue;
2490 read_lock_bh(&state->idev->lock);
2491 state->im = state->idev->mc_list;
2492 }
2493 if (!state->im)
2494 break;
2495 spin_lock_bh(&state->im->mca_lock);
2496 psf = state->im->mca_sources;
2497 }
2498 out:
2499 return psf;
2500 }
2501
2502 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2503 {
2504 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2505 if (psf)
2506 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2507 --pos;
2508 return pos ? NULL : psf;
2509 }
2510
2511 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2512 __acquires(RCU)
2513 {
2514 rcu_read_lock();
2515 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2516 }
2517
2518 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2519 {
2520 struct ip6_sf_list *psf;
2521 if (v == SEQ_START_TOKEN)
2522 psf = igmp6_mcf_get_first(seq);
2523 else
2524 psf = igmp6_mcf_get_next(seq, v);
2525 ++*pos;
2526 return psf;
2527 }
2528
2529 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2530 __releases(RCU)
2531 {
2532 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2533 if (likely(state->im != NULL)) {
2534 spin_unlock_bh(&state->im->mca_lock);
2535 state->im = NULL;
2536 }
2537 if (likely(state->idev != NULL)) {
2538 read_unlock_bh(&state->idev->lock);
2539 state->idev = NULL;
2540 }
2541 state->dev = NULL;
2542 rcu_read_unlock();
2543 }
2544
2545 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2546 {
2547 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2548 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2549
2550 if (v == SEQ_START_TOKEN) {
2551 seq_printf(seq,
2552 "%3s %6s "
2553 "%32s %32s %6s %6s\n", "Idx",
2554 "Device", "Multicast Address",
2555 "Source Address", "INC", "EXC");
2556 } else {
2557 seq_printf(seq,
2558 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2559 state->dev->ifindex, state->dev->name,
2560 &state->im->mca_addr,
2561 &psf->sf_addr,
2562 psf->sf_count[MCAST_INCLUDE],
2563 psf->sf_count[MCAST_EXCLUDE]);
2564 }
2565 return 0;
2566 }
2567
2568 static const struct seq_operations igmp6_mcf_seq_ops = {
2569 .start = igmp6_mcf_seq_start,
2570 .next = igmp6_mcf_seq_next,
2571 .stop = igmp6_mcf_seq_stop,
2572 .show = igmp6_mcf_seq_show,
2573 };
2574
2575 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2576 {
2577 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2578 sizeof(struct igmp6_mcf_iter_state));
2579 }
2580
2581 static const struct file_operations igmp6_mcf_seq_fops = {
2582 .owner = THIS_MODULE,
2583 .open = igmp6_mcf_seq_open,
2584 .read = seq_read,
2585 .llseek = seq_lseek,
2586 .release = seq_release_net,
2587 };
2588
2589 static int __net_init igmp6_proc_init(struct net *net)
2590 {
2591 int err;
2592
2593 err = -ENOMEM;
2594 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2595 goto out;
2596 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2597 &igmp6_mcf_seq_fops))
2598 goto out_proc_net_igmp6;
2599
2600 err = 0;
2601 out:
2602 return err;
2603
2604 out_proc_net_igmp6:
2605 proc_net_remove(net, "igmp6");
2606 goto out;
2607 }
2608
2609 static void __net_exit igmp6_proc_exit(struct net *net)
2610 {
2611 proc_net_remove(net, "mcfilter6");
2612 proc_net_remove(net, "igmp6");
2613 }
2614 #else
2615 static inline int igmp6_proc_init(struct net *net)
2616 {
2617 return 0;
2618 }
2619 static inline void igmp6_proc_exit(struct net *net)
2620 {
2621 }
2622 #endif
2623
2624 static int __net_init igmp6_net_init(struct net *net)
2625 {
2626 int err;
2627
2628 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2629 SOCK_RAW, IPPROTO_ICMPV6, net);
2630 if (err < 0) {
2631 printk(KERN_ERR
2632 "Failed to initialize the IGMP6 control socket (err %d).\n",
2633 err);
2634 goto out;
2635 }
2636
2637 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2638
2639 err = igmp6_proc_init(net);
2640 if (err)
2641 goto out_sock_create;
2642 out:
2643 return err;
2644
2645 out_sock_create:
2646 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2647 goto out;
2648 }
2649
2650 static void __net_exit igmp6_net_exit(struct net *net)
2651 {
2652 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2653 igmp6_proc_exit(net);
2654 }
2655
2656 static struct pernet_operations igmp6_net_ops = {
2657 .init = igmp6_net_init,
2658 .exit = igmp6_net_exit,
2659 };
2660
2661 int __init igmp6_init(void)
2662 {
2663 return register_pernet_subsys(&igmp6_net_ops);
2664 }
2665
2666 void igmp6_cleanup(void)
2667 {
2668 unregister_pernet_subsys(&igmp6_net_ops);
2669 }
Linux kernel - Deliverables
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