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ACER: Fix Smatch double-free issue
[linux-2.6.git] / net / ipv6 / mcast.c
blob92f8e48e4ba4e63606412e317c28d2153eddccb0
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 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 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 dst_release(&rt->dst);
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 spin_lock(&ipv6_sk_mc_lock);
288 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
289 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
290 struct net_device *dev;
291
292 np->ipv6_mc_list = mc_lst->next;
293 spin_unlock(&ipv6_sk_mc_lock);
294
295 rcu_read_lock();
296 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
297 if (dev) {
298 struct inet6_dev *idev = __in6_dev_get(dev);
299
300 (void) ip6_mc_leave_src(sk, mc_lst, idev);
301 if (idev)
302 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
303 } else
304 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
305 rcu_read_unlock();
306
307 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
308 kfree_rcu(mc_lst, rcu);
309
310 spin_lock(&ipv6_sk_mc_lock);
311 }
312 spin_unlock(&ipv6_sk_mc_lock);
313 }
314
315 int ip6_mc_source(int add, int omode, struct sock *sk,
316 struct group_source_req *pgsr)
317 {
318 struct in6_addr *source, *group;
319 struct ipv6_mc_socklist *pmc;
320 struct inet6_dev *idev;
321 struct ipv6_pinfo *inet6 = inet6_sk(sk);
322 struct ip6_sf_socklist *psl;
323 struct net *net = sock_net(sk);
324 int i, j, rv;
325 int leavegroup = 0;
326 int pmclocked = 0;
327 int err;
328
329 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
330 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
331
332 if (!ipv6_addr_is_multicast(group))
333 return -EINVAL;
334
335 rcu_read_lock();
336 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
337 if (!idev) {
338 rcu_read_unlock();
339 return -ENODEV;
340 }
341
342 err = -EADDRNOTAVAIL;
343
344 for_each_pmc_rcu(inet6, pmc) {
345 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
346 continue;
347 if (ipv6_addr_equal(&pmc->addr, group))
348 break;
349 }
350 if (!pmc) { /* must have a prior join */
351 err = -EINVAL;
352 goto done;
353 }
354 /* if a source filter was set, must be the same mode as before */
355 if (pmc->sflist) {
356 if (pmc->sfmode != omode) {
357 err = -EINVAL;
358 goto done;
359 }
360 } else if (pmc->sfmode != omode) {
361 /* allow mode switches for empty-set filters */
362 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
363 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
364 pmc->sfmode = omode;
365 }
366
367 write_lock(&pmc->sflock);
368 pmclocked = 1;
369
370 psl = pmc->sflist;
371 if (!add) {
372 if (!psl)
373 goto done; /* err = -EADDRNOTAVAIL */
374 rv = !0;
375 for (i=0; i<psl->sl_count; i++) {
376 rv = memcmp(&psl->sl_addr[i], source,
377 sizeof(struct in6_addr));
378 if (rv == 0)
379 break;
380 }
381 if (rv) /* source not found */
382 goto done; /* err = -EADDRNOTAVAIL */
383
384 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
385 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
386 leavegroup = 1;
387 goto done;
388 }
389
390 /* update the interface filter */
391 ip6_mc_del_src(idev, group, omode, 1, source, 1);
392
393 for (j=i+1; j<psl->sl_count; j++)
394 psl->sl_addr[j-1] = psl->sl_addr[j];
395 psl->sl_count--;
396 err = 0;
397 goto done;
398 }
399 /* else, add a new source to the filter */
400
401 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
402 err = -ENOBUFS;
403 goto done;
404 }
405 if (!psl || psl->sl_count == psl->sl_max) {
406 struct ip6_sf_socklist *newpsl;
407 int count = IP6_SFBLOCK;
408
409 if (psl)
410 count += psl->sl_max;
411 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
412 if (!newpsl) {
413 err = -ENOBUFS;
414 goto done;
415 }
416 newpsl->sl_max = count;
417 newpsl->sl_count = count - IP6_SFBLOCK;
418 if (psl) {
419 for (i=0; i<psl->sl_count; i++)
420 newpsl->sl_addr[i] = psl->sl_addr[i];
421 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
422 }
423 pmc->sflist = psl = newpsl;
424 }
425 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
426 for (i=0; i<psl->sl_count; i++) {
427 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
428 if (rv == 0)
429 break;
430 }
431 if (rv == 0) /* address already there is an error */
432 goto done;
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 * identify MLD packets for MLD filter exceptions
936 */
937 bool ipv6_is_mld(struct sk_buff *skb, int nexthdr)
938 {
939 struct icmp6hdr *pic;
940
941 if (nexthdr != IPPROTO_ICMPV6)
942 return false;
943
944 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
945 return false;
946
947 pic = icmp6_hdr(skb);
948
949 switch (pic->icmp6_type) {
950 case ICMPV6_MGM_QUERY:
951 case ICMPV6_MGM_REPORT:
952 case ICMPV6_MGM_REDUCTION:
953 case ICMPV6_MLD2_REPORT:
954 return true;
955 default:
956 break;
957 }
958 return false;
959 }
960
961 /*
962 * check if the interface/address pair is valid
963 */
964 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
965 const struct in6_addr *src_addr)
966 {
967 struct inet6_dev *idev;
968 struct ifmcaddr6 *mc;
969 bool rv = false;
970
971 rcu_read_lock();
972 idev = __in6_dev_get(dev);
973 if (idev) {
974 read_lock_bh(&idev->lock);
975 for (mc = idev->mc_list; mc; mc=mc->next) {
976 if (ipv6_addr_equal(&mc->mca_addr, group))
977 break;
978 }
979 if (mc) {
980 if (src_addr && !ipv6_addr_any(src_addr)) {
981 struct ip6_sf_list *psf;
982
983 spin_lock_bh(&mc->mca_lock);
984 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
985 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
986 break;
987 }
988 if (psf)
989 rv = psf->sf_count[MCAST_INCLUDE] ||
990 psf->sf_count[MCAST_EXCLUDE] !=
991 mc->mca_sfcount[MCAST_EXCLUDE];
992 else
993 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
994 spin_unlock_bh(&mc->mca_lock);
995 } else
996 rv = true; /* don't filter unspecified source */
997 }
998 read_unlock_bh(&idev->lock);
999 }
1000 rcu_read_unlock();
1001 return rv;
1002 }
1003
1004 static void mld_gq_start_timer(struct inet6_dev *idev)
1005 {
1006 int tv = net_random() % idev->mc_maxdelay;
1007
1008 idev->mc_gq_running = 1;
1009 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1010 in6_dev_hold(idev);
1011 }
1012
1013 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1014 {
1015 int tv = net_random() % delay;
1016
1017 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1018 in6_dev_hold(idev);
1019 }
1020
1021 /*
1022 * IGMP handling (alias multicast ICMPv6 messages)
1023 */
1024
1025 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1026 {
1027 unsigned long delay = resptime;
1028
1029 /* Do not start timer for these addresses */
1030 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1031 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1032 return;
1033
1034 if (del_timer(&ma->mca_timer)) {
1035 atomic_dec(&ma->mca_refcnt);
1036 delay = ma->mca_timer.expires - jiffies;
1037 }
1038
1039 if (delay >= resptime) {
1040 if (resptime)
1041 delay = net_random() % resptime;
1042 else
1043 delay = 1;
1044 }
1045 ma->mca_timer.expires = jiffies + delay;
1046 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1047 atomic_inc(&ma->mca_refcnt);
1048 ma->mca_flags |= MAF_TIMER_RUNNING;
1049 }
1050
1051 /* mark EXCLUDE-mode sources */
1052 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1053 const struct in6_addr *srcs)
1054 {
1055 struct ip6_sf_list *psf;
1056 int i, scount;
1057
1058 scount = 0;
1059 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1060 if (scount == nsrcs)
1061 break;
1062 for (i=0; i<nsrcs; i++) {
1063 /* skip inactive filters */
1064 if (psf->sf_count[MCAST_INCLUDE] ||
1065 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1066 psf->sf_count[MCAST_EXCLUDE])
1067 break;
1068 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1069 scount++;
1070 break;
1071 }
1072 }
1073 }
1074 pmc->mca_flags &= ~MAF_GSQUERY;
1075 if (scount == nsrcs) /* all sources excluded */
1076 return false;
1077 return true;
1078 }
1079
1080 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1081 const struct in6_addr *srcs)
1082 {
1083 struct ip6_sf_list *psf;
1084 int i, scount;
1085
1086 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1087 return mld_xmarksources(pmc, nsrcs, srcs);
1088
1089 /* mark INCLUDE-mode sources */
1090
1091 scount = 0;
1092 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1093 if (scount == nsrcs)
1094 break;
1095 for (i=0; i<nsrcs; i++) {
1096 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1097 psf->sf_gsresp = 1;
1098 scount++;
1099 break;
1100 }
1101 }
1102 }
1103 if (!scount) {
1104 pmc->mca_flags &= ~MAF_GSQUERY;
1105 return false;
1106 }
1107 pmc->mca_flags |= MAF_GSQUERY;
1108 return true;
1109 }
1110
1111 /* called with rcu_read_lock() */
1112 int igmp6_event_query(struct sk_buff *skb)
1113 {
1114 struct mld2_query *mlh2 = NULL;
1115 struct ifmcaddr6 *ma;
1116 const struct in6_addr *group;
1117 unsigned long max_delay;
1118 struct inet6_dev *idev;
1119 struct mld_msg *mld;
1120 int group_type;
1121 int mark = 0;
1122 int len;
1123
1124 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1125 return -EINVAL;
1126
1127 /* compute payload length excluding extension headers */
1128 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1129 len -= skb_network_header_len(skb);
1130
1131 /* Drop queries with not link local source */
1132 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1133 return -EINVAL;
1134
1135 idev = __in6_dev_get(skb->dev);
1136
1137 if (idev == NULL)
1138 return 0;
1139
1140 mld = (struct mld_msg *)icmp6_hdr(skb);
1141 group = &mld->mld_mca;
1142 group_type = ipv6_addr_type(group);
1143
1144 if (group_type != IPV6_ADDR_ANY &&
1145 !(group_type&IPV6_ADDR_MULTICAST))
1146 return -EINVAL;
1147
1148 if (len == 24) {
1149 int switchback;
1150 /* MLDv1 router present */
1151
1152 /* Translate milliseconds to jiffies */
1153 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1154
1155 switchback = (idev->mc_qrv + 1) * max_delay;
1156 idev->mc_v1_seen = jiffies + switchback;
1157
1158 /* cancel the interface change timer */
1159 idev->mc_ifc_count = 0;
1160 if (del_timer(&idev->mc_ifc_timer))
1161 __in6_dev_put(idev);
1162 /* clear deleted report items */
1163 mld_clear_delrec(idev);
1164 } else if (len >= 28) {
1165 int srcs_offset = sizeof(struct mld2_query) -
1166 sizeof(struct icmp6hdr);
1167 if (!pskb_may_pull(skb, srcs_offset))
1168 return -EINVAL;
1169
1170 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1171 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1172 if (!max_delay)
1173 max_delay = 1;
1174 idev->mc_maxdelay = max_delay;
1175 if (mlh2->mld2q_qrv)
1176 idev->mc_qrv = mlh2->mld2q_qrv;
1177 if (group_type == IPV6_ADDR_ANY) { /* general query */
1178 if (mlh2->mld2q_nsrcs)
1179 return -EINVAL; /* no sources allowed */
1180
1181 mld_gq_start_timer(idev);
1182 return 0;
1183 }
1184 /* mark sources to include, if group & source-specific */
1185 if (mlh2->mld2q_nsrcs != 0) {
1186 if (!pskb_may_pull(skb, srcs_offset +
1187 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1188 return -EINVAL;
1189
1190 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1191 mark = 1;
1192 }
1193 } else
1194 return -EINVAL;
1195
1196 read_lock_bh(&idev->lock);
1197 if (group_type == IPV6_ADDR_ANY) {
1198 for (ma = idev->mc_list; ma; ma=ma->next) {
1199 spin_lock_bh(&ma->mca_lock);
1200 igmp6_group_queried(ma, max_delay);
1201 spin_unlock_bh(&ma->mca_lock);
1202 }
1203 } else {
1204 for (ma = idev->mc_list; ma; ma=ma->next) {
1205 if (!ipv6_addr_equal(group, &ma->mca_addr))
1206 continue;
1207 spin_lock_bh(&ma->mca_lock);
1208 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1209 /* gsquery <- gsquery && mark */
1210 if (!mark)
1211 ma->mca_flags &= ~MAF_GSQUERY;
1212 } else {
1213 /* gsquery <- mark */
1214 if (mark)
1215 ma->mca_flags |= MAF_GSQUERY;
1216 else
1217 ma->mca_flags &= ~MAF_GSQUERY;
1218 }
1219 if (!(ma->mca_flags & MAF_GSQUERY) ||
1220 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1221 igmp6_group_queried(ma, max_delay);
1222 spin_unlock_bh(&ma->mca_lock);
1223 break;
1224 }
1225 }
1226 read_unlock_bh(&idev->lock);
1227
1228 return 0;
1229 }
1230
1231 /* called with rcu_read_lock() */
1232 int igmp6_event_report(struct sk_buff *skb)
1233 {
1234 struct ifmcaddr6 *ma;
1235 struct inet6_dev *idev;
1236 struct mld_msg *mld;
1237 int addr_type;
1238
1239 /* Our own report looped back. Ignore it. */
1240 if (skb->pkt_type == PACKET_LOOPBACK)
1241 return 0;
1242
1243 /* send our report if the MC router may not have heard this report */
1244 if (skb->pkt_type != PACKET_MULTICAST &&
1245 skb->pkt_type != PACKET_BROADCAST)
1246 return 0;
1247
1248 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1249 return -EINVAL;
1250
1251 mld = (struct mld_msg *)icmp6_hdr(skb);
1252
1253 /* Drop reports with not link local source */
1254 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1255 if (addr_type != IPV6_ADDR_ANY &&
1256 !(addr_type&IPV6_ADDR_LINKLOCAL))
1257 return -EINVAL;
1258
1259 idev = __in6_dev_get(skb->dev);
1260 if (idev == NULL)
1261 return -ENODEV;
1262
1263 /*
1264 * Cancel the timer for this group
1265 */
1266
1267 read_lock_bh(&idev->lock);
1268 for (ma = idev->mc_list; ma; ma=ma->next) {
1269 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1270 spin_lock(&ma->mca_lock);
1271 if (del_timer(&ma->mca_timer))
1272 atomic_dec(&ma->mca_refcnt);
1273 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1274 spin_unlock(&ma->mca_lock);
1275 break;
1276 }
1277 }
1278 read_unlock_bh(&idev->lock);
1279 return 0;
1280 }
1281
1282 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1283 int gdeleted, int sdeleted)
1284 {
1285 switch (type) {
1286 case MLD2_MODE_IS_INCLUDE:
1287 case MLD2_MODE_IS_EXCLUDE:
1288 if (gdeleted || sdeleted)
1289 return false;
1290 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1291 if (pmc->mca_sfmode == MCAST_INCLUDE)
1292 return true;
1293 /* don't include if this source is excluded
1294 * in all filters
1295 */
1296 if (psf->sf_count[MCAST_INCLUDE])
1297 return type == MLD2_MODE_IS_INCLUDE;
1298 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1299 psf->sf_count[MCAST_EXCLUDE];
1300 }
1301 return false;
1302 case MLD2_CHANGE_TO_INCLUDE:
1303 if (gdeleted || sdeleted)
1304 return false;
1305 return psf->sf_count[MCAST_INCLUDE] != 0;
1306 case MLD2_CHANGE_TO_EXCLUDE:
1307 if (gdeleted || sdeleted)
1308 return false;
1309 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1310 psf->sf_count[MCAST_INCLUDE])
1311 return false;
1312 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1313 psf->sf_count[MCAST_EXCLUDE];
1314 case MLD2_ALLOW_NEW_SOURCES:
1315 if (gdeleted || !psf->sf_crcount)
1316 return false;
1317 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1318 case MLD2_BLOCK_OLD_SOURCES:
1319 if (pmc->mca_sfmode == MCAST_INCLUDE)
1320 return gdeleted || (psf->sf_crcount && sdeleted);
1321 return psf->sf_crcount && !gdeleted && !sdeleted;
1322 }
1323 return false;
1324 }
1325
1326 static int
1327 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1328 {
1329 struct ip6_sf_list *psf;
1330 int scount = 0;
1331
1332 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1333 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1334 continue;
1335 scount++;
1336 }
1337 return scount;
1338 }
1339
1340 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1341 {
1342 struct net *net = dev_net(dev);
1343 struct sock *sk = net->ipv6.igmp_sk;
1344 struct sk_buff *skb;
1345 struct mld2_report *pmr;
1346 struct in6_addr addr_buf;
1347 const struct in6_addr *saddr;
1348 int hlen = LL_RESERVED_SPACE(dev);
1349 int tlen = dev->needed_tailroom;
1350 int err;
1351 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1352 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1353 IPV6_TLV_PADN, 0 };
1354
1355 /* we assume size > sizeof(ra) here */
1356 size += hlen + tlen;
1357 /* limit our allocations to order-0 page */
1358 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1359 skb = sock_alloc_send_skb(sk, size, 1, &err);
1360
1361 if (!skb)
1362 return NULL;
1363
1364 skb_reserve(skb, hlen);
1365
1366 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1367 /* <draft-ietf-magma-mld-source-05.txt>:
1368 * use unspecified address as the source address
1369 * when a valid link-local address is not available.
1370 */
1371 saddr = &in6addr_any;
1372 } else
1373 saddr = &addr_buf;
1374
1375 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1376
1377 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1378
1379 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1380 skb_put(skb, sizeof(*pmr));
1381 pmr = (struct mld2_report *)skb_transport_header(skb);
1382 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1383 pmr->mld2r_resv1 = 0;
1384 pmr->mld2r_cksum = 0;
1385 pmr->mld2r_resv2 = 0;
1386 pmr->mld2r_ngrec = 0;
1387 return skb;
1388 }
1389
1390 static void mld_sendpack(struct sk_buff *skb)
1391 {
1392 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1393 struct mld2_report *pmr =
1394 (struct mld2_report *)skb_transport_header(skb);
1395 int payload_len, mldlen;
1396 struct inet6_dev *idev;
1397 struct net *net = dev_net(skb->dev);
1398 int err;
1399 struct flowi6 fl6;
1400 struct dst_entry *dst;
1401
1402 rcu_read_lock();
1403 idev = __in6_dev_get(skb->dev);
1404 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1405
1406 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1407 mldlen = skb->tail - skb->transport_header;
1408 pip6->payload_len = htons(payload_len);
1409
1410 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1411 IPPROTO_ICMPV6,
1412 csum_partial(skb_transport_header(skb),
1413 mldlen, 0));
1414
1415 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1416 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1417 skb->dev->ifindex);
1418 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1419
1420 err = 0;
1421 if (IS_ERR(dst)) {
1422 err = PTR_ERR(dst);
1423 dst = NULL;
1424 }
1425 skb_dst_set(skb, dst);
1426 if (err)
1427 goto err_out;
1428
1429 payload_len = skb->len;
1430
1431 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1432 dst_output);
1433 out:
1434 if (!err) {
1435 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1436 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1437 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1438 } else
1439 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1440
1441 rcu_read_unlock();
1442 return;
1443
1444 err_out:
1445 kfree_skb(skb);
1446 goto out;
1447 }
1448
1449 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1450 {
1451 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1452 }
1453
1454 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1455 int type, struct mld2_grec **ppgr)
1456 {
1457 struct net_device *dev = pmc->idev->dev;
1458 struct mld2_report *pmr;
1459 struct mld2_grec *pgr;
1460
1461 if (!skb)
1462 skb = mld_newpack(dev, dev->mtu);
1463 if (!skb)
1464 return NULL;
1465 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1466 pgr->grec_type = type;
1467 pgr->grec_auxwords = 0;
1468 pgr->grec_nsrcs = 0;
1469 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1470 pmr = (struct mld2_report *)skb_transport_header(skb);
1471 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1472 *ppgr = pgr;
1473 return skb;
1474 }
1475
1476 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1477 skb_tailroom(skb)) : 0)
1478
1479 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1480 int type, int gdeleted, int sdeleted)
1481 {
1482 struct net_device *dev = pmc->idev->dev;
1483 struct mld2_report *pmr;
1484 struct mld2_grec *pgr = NULL;
1485 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1486 int scount, stotal, first, isquery, truncate;
1487
1488 if (pmc->mca_flags & MAF_NOREPORT)
1489 return skb;
1490
1491 isquery = type == MLD2_MODE_IS_INCLUDE ||
1492 type == MLD2_MODE_IS_EXCLUDE;
1493 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1494 type == MLD2_CHANGE_TO_EXCLUDE;
1495
1496 stotal = scount = 0;
1497
1498 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1499
1500 if (!*psf_list)
1501 goto empty_source;
1502
1503 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1504
1505 /* EX and TO_EX get a fresh packet, if needed */
1506 if (truncate) {
1507 if (pmr && pmr->mld2r_ngrec &&
1508 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1509 if (skb)
1510 mld_sendpack(skb);
1511 skb = mld_newpack(dev, dev->mtu);
1512 }
1513 }
1514 first = 1;
1515 psf_prev = NULL;
1516 for (psf=*psf_list; psf; psf=psf_next) {
1517 struct in6_addr *psrc;
1518
1519 psf_next = psf->sf_next;
1520
1521 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1522 psf_prev = psf;
1523 continue;
1524 }
1525
1526 /* clear marks on query responses */
1527 if (isquery)
1528 psf->sf_gsresp = 0;
1529
1530 if (AVAILABLE(skb) < sizeof(*psrc) +
1531 first*sizeof(struct mld2_grec)) {
1532 if (truncate && !first)
1533 break; /* truncate these */
1534 if (pgr)
1535 pgr->grec_nsrcs = htons(scount);
1536 if (skb)
1537 mld_sendpack(skb);
1538 skb = mld_newpack(dev, dev->mtu);
1539 first = 1;
1540 scount = 0;
1541 }
1542 if (first) {
1543 skb = add_grhead(skb, pmc, type, &pgr);
1544 first = 0;
1545 }
1546 if (!skb)
1547 return NULL;
1548 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1549 *psrc = psf->sf_addr;
1550 scount++; stotal++;
1551 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1552 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1553 psf->sf_crcount--;
1554 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1555 if (psf_prev)
1556 psf_prev->sf_next = psf->sf_next;
1557 else
1558 *psf_list = psf->sf_next;
1559 kfree(psf);
1560 continue;
1561 }
1562 }
1563 psf_prev = psf;
1564 }
1565
1566 empty_source:
1567 if (!stotal) {
1568 if (type == MLD2_ALLOW_NEW_SOURCES ||
1569 type == MLD2_BLOCK_OLD_SOURCES)
1570 return skb;
1571 if (pmc->mca_crcount || isquery) {
1572 /* make sure we have room for group header */
1573 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1574 mld_sendpack(skb);
1575 skb = NULL; /* add_grhead will get a new one */
1576 }
1577 skb = add_grhead(skb, pmc, type, &pgr);
1578 }
1579 }
1580 if (pgr)
1581 pgr->grec_nsrcs = htons(scount);
1582
1583 if (isquery)
1584 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1585 return skb;
1586 }
1587
1588 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1589 {
1590 struct sk_buff *skb = NULL;
1591 int type;
1592
1593 if (!pmc) {
1594 read_lock_bh(&idev->lock);
1595 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1596 if (pmc->mca_flags & MAF_NOREPORT)
1597 continue;
1598 spin_lock_bh(&pmc->mca_lock);
1599 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1600 type = MLD2_MODE_IS_EXCLUDE;
1601 else
1602 type = MLD2_MODE_IS_INCLUDE;
1603 skb = add_grec(skb, pmc, type, 0, 0);
1604 spin_unlock_bh(&pmc->mca_lock);
1605 }
1606 read_unlock_bh(&idev->lock);
1607 } else {
1608 spin_lock_bh(&pmc->mca_lock);
1609 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1610 type = MLD2_MODE_IS_EXCLUDE;
1611 else
1612 type = MLD2_MODE_IS_INCLUDE;
1613 skb = add_grec(skb, pmc, type, 0, 0);
1614 spin_unlock_bh(&pmc->mca_lock);
1615 }
1616 if (skb)
1617 mld_sendpack(skb);
1618 }
1619
1620 /*
1621 * remove zero-count source records from a source filter list
1622 */
1623 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1624 {
1625 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1626
1627 psf_prev = NULL;
1628 for (psf=*ppsf; psf; psf = psf_next) {
1629 psf_next = psf->sf_next;
1630 if (psf->sf_crcount == 0) {
1631 if (psf_prev)
1632 psf_prev->sf_next = psf->sf_next;
1633 else
1634 *ppsf = psf->sf_next;
1635 kfree(psf);
1636 } else
1637 psf_prev = psf;
1638 }
1639 }
1640
1641 static void mld_send_cr(struct inet6_dev *idev)
1642 {
1643 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1644 struct sk_buff *skb = NULL;
1645 int type, dtype;
1646
1647 read_lock_bh(&idev->lock);
1648 spin_lock(&idev->mc_lock);
1649
1650 /* deleted MCA's */
1651 pmc_prev = NULL;
1652 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1653 pmc_next = pmc->next;
1654 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1655 type = MLD2_BLOCK_OLD_SOURCES;
1656 dtype = MLD2_BLOCK_OLD_SOURCES;
1657 skb = add_grec(skb, pmc, type, 1, 0);
1658 skb = add_grec(skb, pmc, dtype, 1, 1);
1659 }
1660 if (pmc->mca_crcount) {
1661 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1662 type = MLD2_CHANGE_TO_INCLUDE;
1663 skb = add_grec(skb, pmc, type, 1, 0);
1664 }
1665 pmc->mca_crcount--;
1666 if (pmc->mca_crcount == 0) {
1667 mld_clear_zeros(&pmc->mca_tomb);
1668 mld_clear_zeros(&pmc->mca_sources);
1669 }
1670 }
1671 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1672 !pmc->mca_sources) {
1673 if (pmc_prev)
1674 pmc_prev->next = pmc_next;
1675 else
1676 idev->mc_tomb = pmc_next;
1677 in6_dev_put(pmc->idev);
1678 kfree(pmc);
1679 } else
1680 pmc_prev = pmc;
1681 }
1682 spin_unlock(&idev->mc_lock);
1683
1684 /* change recs */
1685 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1686 spin_lock_bh(&pmc->mca_lock);
1687 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1688 type = MLD2_BLOCK_OLD_SOURCES;
1689 dtype = MLD2_ALLOW_NEW_SOURCES;
1690 } else {
1691 type = MLD2_ALLOW_NEW_SOURCES;
1692 dtype = MLD2_BLOCK_OLD_SOURCES;
1693 }
1694 skb = add_grec(skb, pmc, type, 0, 0);
1695 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1696
1697 /* filter mode changes */
1698 if (pmc->mca_crcount) {
1699 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1700 type = MLD2_CHANGE_TO_EXCLUDE;
1701 else
1702 type = MLD2_CHANGE_TO_INCLUDE;
1703 skb = add_grec(skb, pmc, type, 0, 0);
1704 pmc->mca_crcount--;
1705 }
1706 spin_unlock_bh(&pmc->mca_lock);
1707 }
1708 read_unlock_bh(&idev->lock);
1709 if (!skb)
1710 return;
1711 (void) mld_sendpack(skb);
1712 }
1713
1714 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1715 {
1716 struct net *net = dev_net(dev);
1717 struct sock *sk = net->ipv6.igmp_sk;
1718 struct inet6_dev *idev;
1719 struct sk_buff *skb;
1720 struct mld_msg *hdr;
1721 const struct in6_addr *snd_addr, *saddr;
1722 struct in6_addr addr_buf;
1723 int hlen = LL_RESERVED_SPACE(dev);
1724 int tlen = dev->needed_tailroom;
1725 int err, len, payload_len, full_len;
1726 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1727 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1728 IPV6_TLV_PADN, 0 };
1729 struct flowi6 fl6;
1730 struct dst_entry *dst;
1731
1732 if (type == ICMPV6_MGM_REDUCTION)
1733 snd_addr = &in6addr_linklocal_allrouters;
1734 else
1735 snd_addr = addr;
1736
1737 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1738 payload_len = len + sizeof(ra);
1739 full_len = sizeof(struct ipv6hdr) + payload_len;
1740
1741 rcu_read_lock();
1742 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1743 IPSTATS_MIB_OUT, full_len);
1744 rcu_read_unlock();
1745
1746 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1747
1748 if (skb == NULL) {
1749 rcu_read_lock();
1750 IP6_INC_STATS(net, __in6_dev_get(dev),
1751 IPSTATS_MIB_OUTDISCARDS);
1752 rcu_read_unlock();
1753 return;
1754 }
1755
1756 skb_reserve(skb, hlen);
1757
1758 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1759 /* <draft-ietf-magma-mld-source-05.txt>:
1760 * use unspecified address as the source address
1761 * when a valid link-local address is not available.
1762 */
1763 saddr = &in6addr_any;
1764 } else
1765 saddr = &addr_buf;
1766
1767 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1768
1769 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1770
1771 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1772 memset(hdr, 0, sizeof(struct mld_msg));
1773 hdr->mld_type = type;
1774 hdr->mld_mca = *addr;
1775
1776 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1777 IPPROTO_ICMPV6,
1778 csum_partial(hdr, len, 0));
1779
1780 rcu_read_lock();
1781 idev = __in6_dev_get(skb->dev);
1782
1783 icmpv6_flow_init(sk, &fl6, type,
1784 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1785 skb->dev->ifindex);
1786 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1787 if (IS_ERR(dst)) {
1788 err = PTR_ERR(dst);
1789 goto err_out;
1790 }
1791
1792 skb_dst_set(skb, dst);
1793 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1794 dst_output);
1795 out:
1796 if (!err) {
1797 ICMP6MSGOUT_INC_STATS(net, idev, type);
1798 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1799 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1800 } else
1801 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1802
1803 rcu_read_unlock();
1804 return;
1805
1806 err_out:
1807 kfree_skb(skb);
1808 goto out;
1809 }
1810
1811 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1812 const struct in6_addr *psfsrc)
1813 {
1814 struct ip6_sf_list *psf, *psf_prev;
1815 int rv = 0;
1816
1817 psf_prev = NULL;
1818 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1819 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1820 break;
1821 psf_prev = psf;
1822 }
1823 if (!psf || psf->sf_count[sfmode] == 0) {
1824 /* source filter not found, or count wrong => bug */
1825 return -ESRCH;
1826 }
1827 psf->sf_count[sfmode]--;
1828 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1829 struct inet6_dev *idev = pmc->idev;
1830
1831 /* no more filters for this source */
1832 if (psf_prev)
1833 psf_prev->sf_next = psf->sf_next;
1834 else
1835 pmc->mca_sources = psf->sf_next;
1836 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1837 !MLD_V1_SEEN(idev)) {
1838 psf->sf_crcount = idev->mc_qrv;
1839 psf->sf_next = pmc->mca_tomb;
1840 pmc->mca_tomb = psf;
1841 rv = 1;
1842 } else
1843 kfree(psf);
1844 }
1845 return rv;
1846 }
1847
1848 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1849 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1850 int delta)
1851 {
1852 struct ifmcaddr6 *pmc;
1853 int changerec = 0;
1854 int i, err;
1855
1856 if (!idev)
1857 return -ENODEV;
1858 read_lock_bh(&idev->lock);
1859 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1860 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1861 break;
1862 }
1863 if (!pmc) {
1864 /* MCA not found?? bug */
1865 read_unlock_bh(&idev->lock);
1866 return -ESRCH;
1867 }
1868 spin_lock_bh(&pmc->mca_lock);
1869 sf_markstate(pmc);
1870 if (!delta) {
1871 if (!pmc->mca_sfcount[sfmode]) {
1872 spin_unlock_bh(&pmc->mca_lock);
1873 read_unlock_bh(&idev->lock);
1874 return -EINVAL;
1875 }
1876 pmc->mca_sfcount[sfmode]--;
1877 }
1878 err = 0;
1879 for (i=0; i<sfcount; i++) {
1880 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1881
1882 changerec |= rv > 0;
1883 if (!err && rv < 0)
1884 err = rv;
1885 }
1886 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1887 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1888 pmc->mca_sfcount[MCAST_INCLUDE]) {
1889 struct ip6_sf_list *psf;
1890
1891 /* filter mode change */
1892 pmc->mca_sfmode = MCAST_INCLUDE;
1893 pmc->mca_crcount = idev->mc_qrv;
1894 idev->mc_ifc_count = pmc->mca_crcount;
1895 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1896 psf->sf_crcount = 0;
1897 mld_ifc_event(pmc->idev);
1898 } else if (sf_setstate(pmc) || changerec)
1899 mld_ifc_event(pmc->idev);
1900 spin_unlock_bh(&pmc->mca_lock);
1901 read_unlock_bh(&idev->lock);
1902 return err;
1903 }
1904
1905 /*
1906 * Add multicast single-source filter to the interface list
1907 */
1908 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1909 const struct in6_addr *psfsrc)
1910 {
1911 struct ip6_sf_list *psf, *psf_prev;
1912
1913 psf_prev = NULL;
1914 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1915 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1916 break;
1917 psf_prev = psf;
1918 }
1919 if (!psf) {
1920 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1921 if (!psf)
1922 return -ENOBUFS;
1923
1924 psf->sf_addr = *psfsrc;
1925 if (psf_prev) {
1926 psf_prev->sf_next = psf;
1927 } else
1928 pmc->mca_sources = psf;
1929 }
1930 psf->sf_count[sfmode]++;
1931 return 0;
1932 }
1933
1934 static void sf_markstate(struct ifmcaddr6 *pmc)
1935 {
1936 struct ip6_sf_list *psf;
1937 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1938
1939 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1940 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1941 psf->sf_oldin = mca_xcount ==
1942 psf->sf_count[MCAST_EXCLUDE] &&
1943 !psf->sf_count[MCAST_INCLUDE];
1944 } else
1945 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1946 }
1947
1948 static int sf_setstate(struct ifmcaddr6 *pmc)
1949 {
1950 struct ip6_sf_list *psf, *dpsf;
1951 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1952 int qrv = pmc->idev->mc_qrv;
1953 int new_in, rv;
1954
1955 rv = 0;
1956 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1957 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1958 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1959 !psf->sf_count[MCAST_INCLUDE];
1960 } else
1961 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1962 if (new_in) {
1963 if (!psf->sf_oldin) {
1964 struct ip6_sf_list *prev = NULL;
1965
1966 for (dpsf=pmc->mca_tomb; dpsf;
1967 dpsf=dpsf->sf_next) {
1968 if (ipv6_addr_equal(&dpsf->sf_addr,
1969 &psf->sf_addr))
1970 break;
1971 prev = dpsf;
1972 }
1973 if (dpsf) {
1974 if (prev)
1975 prev->sf_next = dpsf->sf_next;
1976 else
1977 pmc->mca_tomb = dpsf->sf_next;
1978 kfree(dpsf);
1979 }
1980 psf->sf_crcount = qrv;
1981 rv++;
1982 }
1983 } else if (psf->sf_oldin) {
1984 psf->sf_crcount = 0;
1985 /*
1986 * add or update "delete" records if an active filter
1987 * is now inactive
1988 */
1989 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1990 if (ipv6_addr_equal(&dpsf->sf_addr,
1991 &psf->sf_addr))
1992 break;
1993 if (!dpsf) {
1994 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1995 if (!dpsf)
1996 continue;
1997 *dpsf = *psf;
1998 /* pmc->mca_lock held by callers */
1999 dpsf->sf_next = pmc->mca_tomb;
2000 pmc->mca_tomb = dpsf;
2001 }
2002 dpsf->sf_crcount = qrv;
2003 rv++;
2004 }
2005 }
2006 return rv;
2007 }
2008
2009 /*
2010 * Add multicast source filter list to the interface list
2011 */
2012 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2013 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2014 int delta)
2015 {
2016 struct ifmcaddr6 *pmc;
2017 int isexclude;
2018 int i, err;
2019
2020 if (!idev)
2021 return -ENODEV;
2022 read_lock_bh(&idev->lock);
2023 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2024 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2025 break;
2026 }
2027 if (!pmc) {
2028 /* MCA not found?? bug */
2029 read_unlock_bh(&idev->lock);
2030 return -ESRCH;
2031 }
2032 spin_lock_bh(&pmc->mca_lock);
2033
2034 sf_markstate(pmc);
2035 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2036 if (!delta)
2037 pmc->mca_sfcount[sfmode]++;
2038 err = 0;
2039 for (i=0; i<sfcount; i++) {
2040 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2041 if (err)
2042 break;
2043 }
2044 if (err) {
2045 int j;
2046
2047 if (!delta)
2048 pmc->mca_sfcount[sfmode]--;
2049 for (j=0; j<i; j++)
2050 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2051 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2052 struct ip6_sf_list *psf;
2053
2054 /* filter mode change */
2055 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2056 pmc->mca_sfmode = MCAST_EXCLUDE;
2057 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2058 pmc->mca_sfmode = MCAST_INCLUDE;
2059 /* else no filters; keep old mode for reports */
2060
2061 pmc->mca_crcount = idev->mc_qrv;
2062 idev->mc_ifc_count = pmc->mca_crcount;
2063 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2064 psf->sf_crcount = 0;
2065 mld_ifc_event(idev);
2066 } else if (sf_setstate(pmc))
2067 mld_ifc_event(idev);
2068 spin_unlock_bh(&pmc->mca_lock);
2069 read_unlock_bh(&idev->lock);
2070 return err;
2071 }
2072
2073 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2074 {
2075 struct ip6_sf_list *psf, *nextpsf;
2076
2077 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2078 nextpsf = psf->sf_next;
2079 kfree(psf);
2080 }
2081 pmc->mca_tomb = NULL;
2082 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2083 nextpsf = psf->sf_next;
2084 kfree(psf);
2085 }
2086 pmc->mca_sources = NULL;
2087 pmc->mca_sfmode = MCAST_EXCLUDE;
2088 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2089 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2090 }
2091
2092
2093 static void igmp6_join_group(struct ifmcaddr6 *ma)
2094 {
2095 unsigned long delay;
2096
2097 if (ma->mca_flags & MAF_NOREPORT)
2098 return;
2099
2100 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2101
2102 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2103
2104 spin_lock_bh(&ma->mca_lock);
2105 if (del_timer(&ma->mca_timer)) {
2106 atomic_dec(&ma->mca_refcnt);
2107 delay = ma->mca_timer.expires - jiffies;
2108 }
2109
2110 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2111 atomic_inc(&ma->mca_refcnt);
2112 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2113 spin_unlock_bh(&ma->mca_lock);
2114 }
2115
2116 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2117 struct inet6_dev *idev)
2118 {
2119 int err;
2120
2121 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2122 * so no other readers or writers of iml or its sflist
2123 */
2124 if (!iml->sflist) {
2125 /* any-source empty exclude case */
2126 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2127 }
2128 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2129 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2130 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2131 iml->sflist = NULL;
2132 return err;
2133 }
2134
2135 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2136 {
2137 if (MLD_V1_SEEN(ma->idev)) {
2138 if (ma->mca_flags & MAF_LAST_REPORTER)
2139 igmp6_send(&ma->mca_addr, ma->idev->dev,
2140 ICMPV6_MGM_REDUCTION);
2141 } else {
2142 mld_add_delrec(ma->idev, ma);
2143 mld_ifc_event(ma->idev);
2144 }
2145 }
2146
2147 static void mld_gq_timer_expire(unsigned long data)
2148 {
2149 struct inet6_dev *idev = (struct inet6_dev *)data;
2150
2151 idev->mc_gq_running = 0;
2152 mld_send_report(idev, NULL);
2153 __in6_dev_put(idev);
2154 }
2155
2156 static void mld_ifc_timer_expire(unsigned long data)
2157 {
2158 struct inet6_dev *idev = (struct inet6_dev *)data;
2159
2160 mld_send_cr(idev);
2161 if (idev->mc_ifc_count) {
2162 idev->mc_ifc_count--;
2163 if (idev->mc_ifc_count)
2164 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2165 }
2166 __in6_dev_put(idev);
2167 }
2168
2169 static void mld_ifc_event(struct inet6_dev *idev)
2170 {
2171 if (MLD_V1_SEEN(idev))
2172 return;
2173 idev->mc_ifc_count = idev->mc_qrv;
2174 mld_ifc_start_timer(idev, 1);
2175 }
2176
2177
2178 static void igmp6_timer_handler(unsigned long data)
2179 {
2180 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2181
2182 if (MLD_V1_SEEN(ma->idev))
2183 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2184 else
2185 mld_send_report(ma->idev, ma);
2186
2187 spin_lock(&ma->mca_lock);
2188 ma->mca_flags |= MAF_LAST_REPORTER;
2189 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2190 spin_unlock(&ma->mca_lock);
2191 ma_put(ma);
2192 }
2193
2194 /* Device changing type */
2195
2196 void ipv6_mc_unmap(struct inet6_dev *idev)
2197 {
2198 struct ifmcaddr6 *i;
2199
2200 /* Install multicast list, except for all-nodes (already installed) */
2201
2202 read_lock_bh(&idev->lock);
2203 for (i = idev->mc_list; i; i = i->next)
2204 igmp6_group_dropped(i);
2205 read_unlock_bh(&idev->lock);
2206 }
2207
2208 void ipv6_mc_remap(struct inet6_dev *idev)
2209 {
2210 ipv6_mc_up(idev);
2211 }
2212
2213 /* Device going down */
2214
2215 void ipv6_mc_down(struct inet6_dev *idev)
2216 {
2217 struct ifmcaddr6 *i;
2218
2219 /* Withdraw multicast list */
2220
2221 read_lock_bh(&idev->lock);
2222 idev->mc_ifc_count = 0;
2223 if (del_timer(&idev->mc_ifc_timer))
2224 __in6_dev_put(idev);
2225 idev->mc_gq_running = 0;
2226 if (del_timer(&idev->mc_gq_timer))
2227 __in6_dev_put(idev);
2228
2229 for (i = idev->mc_list; i; i=i->next)
2230 igmp6_group_dropped(i);
2231 read_unlock_bh(&idev->lock);
2232
2233 mld_clear_delrec(idev);
2234 }
2235
2236
2237 /* Device going up */
2238
2239 void ipv6_mc_up(struct inet6_dev *idev)
2240 {
2241 struct ifmcaddr6 *i;
2242
2243 /* Install multicast list, except for all-nodes (already installed) */
2244
2245 read_lock_bh(&idev->lock);
2246 for (i = idev->mc_list; i; i=i->next)
2247 igmp6_group_added(i);
2248 read_unlock_bh(&idev->lock);
2249 }
2250
2251 /* IPv6 device initialization. */
2252
2253 void ipv6_mc_init_dev(struct inet6_dev *idev)
2254 {
2255 write_lock_bh(&idev->lock);
2256 spin_lock_init(&idev->mc_lock);
2257 idev->mc_gq_running = 0;
2258 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2259 (unsigned long)idev);
2260 idev->mc_tomb = NULL;
2261 idev->mc_ifc_count = 0;
2262 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2263 (unsigned long)idev);
2264 idev->mc_qrv = MLD_QRV_DEFAULT;
2265 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2266 idev->mc_v1_seen = 0;
2267 write_unlock_bh(&idev->lock);
2268 }
2269
2270 /*
2271 * Device is about to be destroyed: clean up.
2272 */
2273
2274 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2275 {
2276 struct ifmcaddr6 *i;
2277
2278 /* Deactivate timers */
2279 ipv6_mc_down(idev);
2280
2281 /* Delete all-nodes address. */
2282 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2283 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2284 * fail.
2285 */
2286 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2287
2288 if (idev->cnf.forwarding)
2289 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2290
2291 write_lock_bh(&idev->lock);
2292 while ((i = idev->mc_list) != NULL) {
2293 idev->mc_list = i->next;
2294 write_unlock_bh(&idev->lock);
2295
2296 igmp6_group_dropped(i);
2297 ma_put(i);
2298
2299 write_lock_bh(&idev->lock);
2300 }
2301 write_unlock_bh(&idev->lock);
2302 }
2303
2304 #ifdef CONFIG_PROC_FS
2305 struct igmp6_mc_iter_state {
2306 struct seq_net_private p;
2307 struct net_device *dev;
2308 struct inet6_dev *idev;
2309 };
2310
2311 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2312
2313 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2314 {
2315 struct ifmcaddr6 *im = NULL;
2316 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2317 struct net *net = seq_file_net(seq);
2318
2319 state->idev = NULL;
2320 for_each_netdev_rcu(net, state->dev) {
2321 struct inet6_dev *idev;
2322 idev = __in6_dev_get(state->dev);
2323 if (!idev)
2324 continue;
2325 read_lock_bh(&idev->lock);
2326 im = idev->mc_list;
2327 if (im) {
2328 state->idev = idev;
2329 break;
2330 }
2331 read_unlock_bh(&idev->lock);
2332 }
2333 return im;
2334 }
2335
2336 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2337 {
2338 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2339
2340 im = im->next;
2341 while (!im) {
2342 if (likely(state->idev != NULL))
2343 read_unlock_bh(&state->idev->lock);
2344
2345 state->dev = next_net_device_rcu(state->dev);
2346 if (!state->dev) {
2347 state->idev = NULL;
2348 break;
2349 }
2350 state->idev = __in6_dev_get(state->dev);
2351 if (!state->idev)
2352 continue;
2353 read_lock_bh(&state->idev->lock);
2354 im = state->idev->mc_list;
2355 }
2356 return im;
2357 }
2358
2359 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2360 {
2361 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2362 if (im)
2363 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2364 --pos;
2365 return pos ? NULL : im;
2366 }
2367
2368 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2369 __acquires(RCU)
2370 {
2371 rcu_read_lock();
2372 return igmp6_mc_get_idx(seq, *pos);
2373 }
2374
2375 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2376 {
2377 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2378
2379 ++*pos;
2380 return im;
2381 }
2382
2383 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2384 __releases(RCU)
2385 {
2386 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2387
2388 if (likely(state->idev != NULL)) {
2389 read_unlock_bh(&state->idev->lock);
2390 state->idev = NULL;
2391 }
2392 state->dev = NULL;
2393 rcu_read_unlock();
2394 }
2395
2396 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2397 {
2398 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2399 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2400
2401 seq_printf(seq,
2402 "%-4d %-15s %pi6 %5d %08X %ld\n",
2403 state->dev->ifindex, state->dev->name,
2404 &im->mca_addr,
2405 im->mca_users, im->mca_flags,
2406 (im->mca_flags&MAF_TIMER_RUNNING) ?
2407 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2408 return 0;
2409 }
2410
2411 static const struct seq_operations igmp6_mc_seq_ops = {
2412 .start = igmp6_mc_seq_start,
2413 .next = igmp6_mc_seq_next,
2414 .stop = igmp6_mc_seq_stop,
2415 .show = igmp6_mc_seq_show,
2416 };
2417
2418 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2419 {
2420 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2421 sizeof(struct igmp6_mc_iter_state));
2422 }
2423
2424 static const struct file_operations igmp6_mc_seq_fops = {
2425 .owner = THIS_MODULE,
2426 .open = igmp6_mc_seq_open,
2427 .read = seq_read,
2428 .llseek = seq_lseek,
2429 .release = seq_release_net,
2430 };
2431
2432 struct igmp6_mcf_iter_state {
2433 struct seq_net_private p;
2434 struct net_device *dev;
2435 struct inet6_dev *idev;
2436 struct ifmcaddr6 *im;
2437 };
2438
2439 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2440
2441 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2442 {
2443 struct ip6_sf_list *psf = NULL;
2444 struct ifmcaddr6 *im = NULL;
2445 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2446 struct net *net = seq_file_net(seq);
2447
2448 state->idev = NULL;
2449 state->im = NULL;
2450 for_each_netdev_rcu(net, state->dev) {
2451 struct inet6_dev *idev;
2452 idev = __in6_dev_get(state->dev);
2453 if (unlikely(idev == NULL))
2454 continue;
2455 read_lock_bh(&idev->lock);
2456 im = idev->mc_list;
2457 if (likely(im != NULL)) {
2458 spin_lock_bh(&im->mca_lock);
2459 psf = im->mca_sources;
2460 if (likely(psf != NULL)) {
2461 state->im = im;
2462 state->idev = idev;
2463 break;
2464 }
2465 spin_unlock_bh(&im->mca_lock);
2466 }
2467 read_unlock_bh(&idev->lock);
2468 }
2469 return psf;
2470 }
2471
2472 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2473 {
2474 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2475
2476 psf = psf->sf_next;
2477 while (!psf) {
2478 spin_unlock_bh(&state->im->mca_lock);
2479 state->im = state->im->next;
2480 while (!state->im) {
2481 if (likely(state->idev != NULL))
2482 read_unlock_bh(&state->idev->lock);
2483
2484 state->dev = next_net_device_rcu(state->dev);
2485 if (!state->dev) {
2486 state->idev = NULL;
2487 goto out;
2488 }
2489 state->idev = __in6_dev_get(state->dev);
2490 if (!state->idev)
2491 continue;
2492 read_lock_bh(&state->idev->lock);
2493 state->im = state->idev->mc_list;
2494 }
2495 if (!state->im)
2496 break;
2497 spin_lock_bh(&state->im->mca_lock);
2498 psf = state->im->mca_sources;
2499 }
2500 out:
2501 return psf;
2502 }
2503
2504 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2505 {
2506 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2507 if (psf)
2508 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2509 --pos;
2510 return pos ? NULL : psf;
2511 }
2512
2513 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2514 __acquires(RCU)
2515 {
2516 rcu_read_lock();
2517 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2518 }
2519
2520 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2521 {
2522 struct ip6_sf_list *psf;
2523 if (v == SEQ_START_TOKEN)
2524 psf = igmp6_mcf_get_first(seq);
2525 else
2526 psf = igmp6_mcf_get_next(seq, v);
2527 ++*pos;
2528 return psf;
2529 }
2530
2531 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2532 __releases(RCU)
2533 {
2534 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2535 if (likely(state->im != NULL)) {
2536 spin_unlock_bh(&state->im->mca_lock);
2537 state->im = NULL;
2538 }
2539 if (likely(state->idev != NULL)) {
2540 read_unlock_bh(&state->idev->lock);
2541 state->idev = NULL;
2542 }
2543 state->dev = NULL;
2544 rcu_read_unlock();
2545 }
2546
2547 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2548 {
2549 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2550 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2551
2552 if (v == SEQ_START_TOKEN) {
2553 seq_printf(seq,
2554 "%3s %6s "
2555 "%32s %32s %6s %6s\n", "Idx",
2556 "Device", "Multicast Address",
2557 "Source Address", "INC", "EXC");
2558 } else {
2559 seq_printf(seq,
2560 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2561 state->dev->ifindex, state->dev->name,
2562 &state->im->mca_addr,
2563 &psf->sf_addr,
2564 psf->sf_count[MCAST_INCLUDE],
2565 psf->sf_count[MCAST_EXCLUDE]);
2566 }
2567 return 0;
2568 }
2569
2570 static const struct seq_operations igmp6_mcf_seq_ops = {
2571 .start = igmp6_mcf_seq_start,
2572 .next = igmp6_mcf_seq_next,
2573 .stop = igmp6_mcf_seq_stop,
2574 .show = igmp6_mcf_seq_show,
2575 };
2576
2577 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2578 {
2579 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2580 sizeof(struct igmp6_mcf_iter_state));
2581 }
2582
2583 static const struct file_operations igmp6_mcf_seq_fops = {
2584 .owner = THIS_MODULE,
2585 .open = igmp6_mcf_seq_open,
2586 .read = seq_read,
2587 .llseek = seq_lseek,
2588 .release = seq_release_net,
2589 };
2590
2591 static int __net_init igmp6_proc_init(struct net *net)
2592 {
2593 int err;
2594
2595 err = -ENOMEM;
2596 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2597 goto out;
2598 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2599 &igmp6_mcf_seq_fops))
2600 goto out_proc_net_igmp6;
2601
2602 err = 0;
2603 out:
2604 return err;
2605
2606 out_proc_net_igmp6:
2607 proc_net_remove(net, "igmp6");
2608 goto out;
2609 }
2610
2611 static void __net_exit igmp6_proc_exit(struct net *net)
2612 {
2613 proc_net_remove(net, "mcfilter6");
2614 proc_net_remove(net, "igmp6");
2615 }
2616 #else
2617 static inline int igmp6_proc_init(struct net *net)
2618 {
2619 return 0;
2620 }
2621 static inline void igmp6_proc_exit(struct net *net)
2622 {
2623 }
2624 #endif
2625
2626 static int __net_init igmp6_net_init(struct net *net)
2627 {
2628 int err;
2629
2630 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2631 SOCK_RAW, IPPROTO_ICMPV6, net);
2632 if (err < 0) {
2633 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2634 err);
2635 goto out;
2636 }
2637
2638 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2639
2640 err = igmp6_proc_init(net);
2641 if (err)
2642 goto out_sock_create;
2643 out:
2644 return err;
2645
2646 out_sock_create:
2647 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2648 goto out;
2649 }
2650
2651 static void __net_exit igmp6_net_exit(struct net *net)
2652 {
2653 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2654 igmp6_proc_exit(net);
2655 }
2656
2657 static struct pernet_operations igmp6_net_ops = {
2658 .init = igmp6_net_init,
2659 .exit = igmp6_net_exit,
2660 };
2661
2662 int __init igmp6_init(void)
2663 {
2664 return register_pernet_subsys(&igmp6_net_ops);
2665 }
2666
2667 void igmp6_cleanup(void)
2668 {
2669 unregister_pernet_subsys(&igmp6_net_ops);
2670 }
Linus' kernel tree