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Linux 3.11-rc3
[cris-mirror.git] / net / ipv6 / mcast.c
blob99cd65c715cdd4a41a31f6ddc1fa28d327651634
1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <net/mld.h>
48
49 #include <linux/netfilter.h>
50 #include <linux/netfilter_ipv6.h>
51
52 #include <net/net_namespace.h>
53 #include <net/sock.h>
54 #include <net/snmp.h>
55
56 #include <net/ipv6.h>
57 #include <net/protocol.h>
58 #include <net/if_inet6.h>
59 #include <net/ndisc.h>
60 #include <net/addrconf.h>
61 #include <net/ip6_route.h>
62 #include <net/inet_common.h>
63
64 #include <net/ip6_checksum.h>
65
66 /* Set to 3 to get tracing... */
67 #define MCAST_DEBUG 2
68
69 #if MCAST_DEBUG >= 3
70 #define MDBG(x) printk x
71 #else
72 #define MDBG(x)
73 #endif
74
75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
77 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
80 };
81
82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
83
84 /* Big mc list lock for all the sockets */
85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
86
87 static void igmp6_join_group(struct ifmcaddr6 *ma);
88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
89 static void igmp6_timer_handler(unsigned long data);
90
91 static void mld_gq_timer_expire(unsigned long data);
92 static void mld_ifc_timer_expire(unsigned long data);
93 static void mld_ifc_event(struct inet6_dev *idev);
94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
95 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
96 static void mld_clear_delrec(struct inet6_dev *idev);
97 static int sf_setstate(struct ifmcaddr6 *pmc);
98 static void sf_markstate(struct ifmcaddr6 *pmc);
99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
100 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
101 int sfmode, int sfcount, const struct in6_addr *psfsrc,
102 int delta);
103 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
104 int sfmode, int sfcount, const struct in6_addr *psfsrc,
105 int delta);
106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107 struct inet6_dev *idev);
108
109
110 #define IGMP6_UNSOLICITED_IVAL (10*HZ)
111 #define MLD_QRV_DEFAULT 2
112
113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
114 (idev)->cnf.force_mld_version == 1 || \
115 ((idev)->mc_v1_seen && \
116 time_before(jiffies, (idev)->mc_v1_seen)))
117
118 #define IPV6_MLD_MAX_MSF 64
119
120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
121
122 /*
123 * socket join on multicast group
124 */
125
126 #define for_each_pmc_rcu(np, pmc) \
127 for (pmc = rcu_dereference(np->ipv6_mc_list); \
128 pmc != NULL; \
129 pmc = rcu_dereference(pmc->next))
130
131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
132 {
133 struct net_device *dev = NULL;
134 struct ipv6_mc_socklist *mc_lst;
135 struct ipv6_pinfo *np = inet6_sk(sk);
136 struct net *net = sock_net(sk);
137 int err;
138
139 if (!ipv6_addr_is_multicast(addr))
140 return -EINVAL;
141
142 rcu_read_lock();
143 for_each_pmc_rcu(np, mc_lst) {
144 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145 ipv6_addr_equal(&mc_lst->addr, addr)) {
146 rcu_read_unlock();
147 return -EADDRINUSE;
148 }
149 }
150 rcu_read_unlock();
151
152 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
153
154 if (mc_lst == NULL)
155 return -ENOMEM;
156
157 mc_lst->next = NULL;
158 mc_lst->addr = *addr;
159
160 rcu_read_lock();
161 if (ifindex == 0) {
162 struct rt6_info *rt;
163 rt = rt6_lookup(net, addr, NULL, 0, 0);
164 if (rt) {
165 dev = rt->dst.dev;
166 ip6_rt_put(rt);
167 }
168 } else
169 dev = dev_get_by_index_rcu(net, ifindex);
170
171 if (dev == NULL) {
172 rcu_read_unlock();
173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174 return -ENODEV;
175 }
176
177 mc_lst->ifindex = dev->ifindex;
178 mc_lst->sfmode = MCAST_EXCLUDE;
179 rwlock_init(&mc_lst->sflock);
180 mc_lst->sflist = NULL;
181
182 /*
183 * now add/increase the group membership on the device
184 */
185
186 err = ipv6_dev_mc_inc(dev, addr);
187
188 if (err) {
189 rcu_read_unlock();
190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191 return err;
192 }
193
194 spin_lock(&ipv6_sk_mc_lock);
195 mc_lst->next = np->ipv6_mc_list;
196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 spin_unlock(&ipv6_sk_mc_lock);
198
199 rcu_read_unlock();
200
201 return 0;
202 }
203
204 /*
205 * socket leave on multicast group
206 */
207 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 {
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct ipv6_mc_socklist *mc_lst;
211 struct ipv6_mc_socklist __rcu **lnk;
212 struct net *net = sock_net(sk);
213
214 if (!ipv6_addr_is_multicast(addr))
215 return -EINVAL;
216
217 spin_lock(&ipv6_sk_mc_lock);
218 for (lnk = &np->ipv6_mc_list;
219 (mc_lst = rcu_dereference_protected(*lnk,
220 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
221 lnk = &mc_lst->next) {
222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223 ipv6_addr_equal(&mc_lst->addr, addr)) {
224 struct net_device *dev;
225
226 *lnk = mc_lst->next;
227 spin_unlock(&ipv6_sk_mc_lock);
228
229 rcu_read_lock();
230 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
231 if (dev != NULL) {
232 struct inet6_dev *idev = __in6_dev_get(dev);
233
234 (void) ip6_mc_leave_src(sk, mc_lst, idev);
235 if (idev)
236 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
237 } else
238 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
239 rcu_read_unlock();
240 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
241 kfree_rcu(mc_lst, rcu);
242 return 0;
243 }
244 }
245 spin_unlock(&ipv6_sk_mc_lock);
246
247 return -EADDRNOTAVAIL;
248 }
249
250 /* called with rcu_read_lock() */
251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
252 const struct in6_addr *group,
253 int ifindex)
254 {
255 struct net_device *dev = NULL;
256 struct inet6_dev *idev = NULL;
257
258 if (ifindex == 0) {
259 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
260
261 if (rt) {
262 dev = rt->dst.dev;
263 ip6_rt_put(rt);
264 }
265 } else
266 dev = dev_get_by_index_rcu(net, ifindex);
267
268 if (!dev)
269 return NULL;
270 idev = __in6_dev_get(dev);
271 if (!idev)
272 return NULL;
273 read_lock_bh(&idev->lock);
274 if (idev->dead) {
275 read_unlock_bh(&idev->lock);
276 return NULL;
277 }
278 return idev;
279 }
280
281 void ipv6_sock_mc_close(struct sock *sk)
282 {
283 struct ipv6_pinfo *np = inet6_sk(sk);
284 struct ipv6_mc_socklist *mc_lst;
285 struct net *net = sock_net(sk);
286
287 if (!rcu_access_pointer(np->ipv6_mc_list))
288 return;
289
290 spin_lock(&ipv6_sk_mc_lock);
291 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
292 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
293 struct net_device *dev;
294
295 np->ipv6_mc_list = mc_lst->next;
296 spin_unlock(&ipv6_sk_mc_lock);
297
298 rcu_read_lock();
299 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
300 if (dev) {
301 struct inet6_dev *idev = __in6_dev_get(dev);
302
303 (void) ip6_mc_leave_src(sk, mc_lst, idev);
304 if (idev)
305 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
306 } else
307 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
308 rcu_read_unlock();
309
310 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
311 kfree_rcu(mc_lst, rcu);
312
313 spin_lock(&ipv6_sk_mc_lock);
314 }
315 spin_unlock(&ipv6_sk_mc_lock);
316 }
317
318 int ip6_mc_source(int add, int omode, struct sock *sk,
319 struct group_source_req *pgsr)
320 {
321 struct in6_addr *source, *group;
322 struct ipv6_mc_socklist *pmc;
323 struct inet6_dev *idev;
324 struct ipv6_pinfo *inet6 = inet6_sk(sk);
325 struct ip6_sf_socklist *psl;
326 struct net *net = sock_net(sk);
327 int i, j, rv;
328 int leavegroup = 0;
329 int pmclocked = 0;
330 int err;
331
332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
334
335 if (!ipv6_addr_is_multicast(group))
336 return -EINVAL;
337
338 rcu_read_lock();
339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
340 if (!idev) {
341 rcu_read_unlock();
342 return -ENODEV;
343 }
344
345 err = -EADDRNOTAVAIL;
346
347 for_each_pmc_rcu(inet6, pmc) {
348 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
349 continue;
350 if (ipv6_addr_equal(&pmc->addr, group))
351 break;
352 }
353 if (!pmc) { /* must have a prior join */
354 err = -EINVAL;
355 goto done;
356 }
357 /* if a source filter was set, must be the same mode as before */
358 if (pmc->sflist) {
359 if (pmc->sfmode != omode) {
360 err = -EINVAL;
361 goto done;
362 }
363 } else if (pmc->sfmode != omode) {
364 /* allow mode switches for empty-set filters */
365 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
366 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
367 pmc->sfmode = omode;
368 }
369
370 write_lock(&pmc->sflock);
371 pmclocked = 1;
372
373 psl = pmc->sflist;
374 if (!add) {
375 if (!psl)
376 goto done; /* err = -EADDRNOTAVAIL */
377 rv = !0;
378 for (i=0; i<psl->sl_count; i++) {
379 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
380 if (rv == 0)
381 break;
382 }
383 if (rv) /* source not found */
384 goto done; /* err = -EADDRNOTAVAIL */
385
386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
388 leavegroup = 1;
389 goto done;
390 }
391
392 /* update the interface filter */
393 ip6_mc_del_src(idev, group, omode, 1, source, 1);
394
395 for (j=i+1; j<psl->sl_count; j++)
396 psl->sl_addr[j-1] = psl->sl_addr[j];
397 psl->sl_count--;
398 err = 0;
399 goto done;
400 }
401 /* else, add a new source to the filter */
402
403 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
404 err = -ENOBUFS;
405 goto done;
406 }
407 if (!psl || psl->sl_count == psl->sl_max) {
408 struct ip6_sf_socklist *newpsl;
409 int count = IP6_SFBLOCK;
410
411 if (psl)
412 count += psl->sl_max;
413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
414 if (!newpsl) {
415 err = -ENOBUFS;
416 goto done;
417 }
418 newpsl->sl_max = count;
419 newpsl->sl_count = count - IP6_SFBLOCK;
420 if (psl) {
421 for (i=0; i<psl->sl_count; i++)
422 newpsl->sl_addr[i] = psl->sl_addr[i];
423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
424 }
425 pmc->sflist = psl = newpsl;
426 }
427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
428 for (i=0; i<psl->sl_count; i++) {
429 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
430 if (rv == 0) /* There is an error in the address. */
431 goto done;
432 }
433 for (j=psl->sl_count-1; j>=i; j--)
434 psl->sl_addr[j+1] = psl->sl_addr[j];
435 psl->sl_addr[i] = *source;
436 psl->sl_count++;
437 err = 0;
438 /* update the interface list */
439 ip6_mc_add_src(idev, group, omode, 1, source, 1);
440 done:
441 if (pmclocked)
442 write_unlock(&pmc->sflock);
443 read_unlock_bh(&idev->lock);
444 rcu_read_unlock();
445 if (leavegroup)
446 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
447 return err;
448 }
449
450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
451 {
452 const struct in6_addr *group;
453 struct ipv6_mc_socklist *pmc;
454 struct inet6_dev *idev;
455 struct ipv6_pinfo *inet6 = inet6_sk(sk);
456 struct ip6_sf_socklist *newpsl, *psl;
457 struct net *net = sock_net(sk);
458 int leavegroup = 0;
459 int i, err;
460
461 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
462
463 if (!ipv6_addr_is_multicast(group))
464 return -EINVAL;
465 if (gsf->gf_fmode != MCAST_INCLUDE &&
466 gsf->gf_fmode != MCAST_EXCLUDE)
467 return -EINVAL;
468
469 rcu_read_lock();
470 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
471
472 if (!idev) {
473 rcu_read_unlock();
474 return -ENODEV;
475 }
476
477 err = 0;
478
479 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
480 leavegroup = 1;
481 goto done;
482 }
483
484 for_each_pmc_rcu(inet6, pmc) {
485 if (pmc->ifindex != gsf->gf_interface)
486 continue;
487 if (ipv6_addr_equal(&pmc->addr, group))
488 break;
489 }
490 if (!pmc) { /* must have a prior join */
491 err = -EINVAL;
492 goto done;
493 }
494 if (gsf->gf_numsrc) {
495 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
496 GFP_ATOMIC);
497 if (!newpsl) {
498 err = -ENOBUFS;
499 goto done;
500 }
501 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
502 for (i=0; i<newpsl->sl_count; ++i) {
503 struct sockaddr_in6 *psin6;
504
505 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
506 newpsl->sl_addr[i] = psin6->sin6_addr;
507 }
508 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
509 newpsl->sl_count, newpsl->sl_addr, 0);
510 if (err) {
511 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
512 goto done;
513 }
514 } else {
515 newpsl = NULL;
516 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
517 }
518
519 write_lock(&pmc->sflock);
520 psl = pmc->sflist;
521 if (psl) {
522 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
523 psl->sl_count, psl->sl_addr, 0);
524 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
525 } else
526 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
527 pmc->sflist = newpsl;
528 pmc->sfmode = gsf->gf_fmode;
529 write_unlock(&pmc->sflock);
530 err = 0;
531 done:
532 read_unlock_bh(&idev->lock);
533 rcu_read_unlock();
534 if (leavegroup)
535 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
536 return err;
537 }
538
539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
540 struct group_filter __user *optval, int __user *optlen)
541 {
542 int err, i, count, copycount;
543 const struct in6_addr *group;
544 struct ipv6_mc_socklist *pmc;
545 struct inet6_dev *idev;
546 struct ipv6_pinfo *inet6 = inet6_sk(sk);
547 struct ip6_sf_socklist *psl;
548 struct net *net = sock_net(sk);
549
550 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
551
552 if (!ipv6_addr_is_multicast(group))
553 return -EINVAL;
554
555 rcu_read_lock();
556 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
557
558 if (!idev) {
559 rcu_read_unlock();
560 return -ENODEV;
561 }
562
563 err = -EADDRNOTAVAIL;
564 /*
565 * changes to the ipv6_mc_list require the socket lock and
566 * a read lock on ip6_sk_mc_lock. We have the socket lock,
567 * so reading the list is safe.
568 */
569
570 for_each_pmc_rcu(inet6, pmc) {
571 if (pmc->ifindex != gsf->gf_interface)
572 continue;
573 if (ipv6_addr_equal(group, &pmc->addr))
574 break;
575 }
576 if (!pmc) /* must have a prior join */
577 goto done;
578 gsf->gf_fmode = pmc->sfmode;
579 psl = pmc->sflist;
580 count = psl ? psl->sl_count : 0;
581 read_unlock_bh(&idev->lock);
582 rcu_read_unlock();
583
584 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
585 gsf->gf_numsrc = count;
586 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
587 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
588 return -EFAULT;
589 }
590 /* changes to psl require the socket lock, a read lock on
591 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
592 * have the socket lock, so reading here is safe.
593 */
594 for (i=0; i<copycount; i++) {
595 struct sockaddr_in6 *psin6;
596 struct sockaddr_storage ss;
597
598 psin6 = (struct sockaddr_in6 *)&ss;
599 memset(&ss, 0, sizeof(ss));
600 psin6->sin6_family = AF_INET6;
601 psin6->sin6_addr = psl->sl_addr[i];
602 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
603 return -EFAULT;
604 }
605 return 0;
606 done:
607 read_unlock_bh(&idev->lock);
608 rcu_read_unlock();
609 return err;
610 }
611
612 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
613 const struct in6_addr *src_addr)
614 {
615 struct ipv6_pinfo *np = inet6_sk(sk);
616 struct ipv6_mc_socklist *mc;
617 struct ip6_sf_socklist *psl;
618 bool rv = true;
619
620 rcu_read_lock();
621 for_each_pmc_rcu(np, mc) {
622 if (ipv6_addr_equal(&mc->addr, mc_addr))
623 break;
624 }
625 if (!mc) {
626 rcu_read_unlock();
627 return true;
628 }
629 read_lock(&mc->sflock);
630 psl = mc->sflist;
631 if (!psl) {
632 rv = mc->sfmode == MCAST_EXCLUDE;
633 } else {
634 int i;
635
636 for (i=0; i<psl->sl_count; i++) {
637 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
638 break;
639 }
640 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
641 rv = false;
642 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
643 rv = false;
644 }
645 read_unlock(&mc->sflock);
646 rcu_read_unlock();
647
648 return rv;
649 }
650
651 static void ma_put(struct ifmcaddr6 *mc)
652 {
653 if (atomic_dec_and_test(&mc->mca_refcnt)) {
654 in6_dev_put(mc->idev);
655 kfree(mc);
656 }
657 }
658
659 static void igmp6_group_added(struct ifmcaddr6 *mc)
660 {
661 struct net_device *dev = mc->idev->dev;
662 char buf[MAX_ADDR_LEN];
663
664 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
665 IPV6_ADDR_SCOPE_LINKLOCAL)
666 return;
667
668 spin_lock_bh(&mc->mca_lock);
669 if (!(mc->mca_flags&MAF_LOADED)) {
670 mc->mca_flags |= MAF_LOADED;
671 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
672 dev_mc_add(dev, buf);
673 }
674 spin_unlock_bh(&mc->mca_lock);
675
676 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
677 return;
678
679 if (MLD_V1_SEEN(mc->idev)) {
680 igmp6_join_group(mc);
681 return;
682 }
683 /* else v2 */
684
685 mc->mca_crcount = mc->idev->mc_qrv;
686 mld_ifc_event(mc->idev);
687 }
688
689 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
690 {
691 struct net_device *dev = mc->idev->dev;
692 char buf[MAX_ADDR_LEN];
693
694 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
695 IPV6_ADDR_SCOPE_LINKLOCAL)
696 return;
697
698 spin_lock_bh(&mc->mca_lock);
699 if (mc->mca_flags&MAF_LOADED) {
700 mc->mca_flags &= ~MAF_LOADED;
701 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
702 dev_mc_del(dev, buf);
703 }
704
705 if (mc->mca_flags & MAF_NOREPORT)
706 goto done;
707 spin_unlock_bh(&mc->mca_lock);
708
709 if (!mc->idev->dead)
710 igmp6_leave_group(mc);
711
712 spin_lock_bh(&mc->mca_lock);
713 if (del_timer(&mc->mca_timer))
714 atomic_dec(&mc->mca_refcnt);
715 done:
716 ip6_mc_clear_src(mc);
717 spin_unlock_bh(&mc->mca_lock);
718 }
719
720 /*
721 * deleted ifmcaddr6 manipulation
722 */
723 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
724 {
725 struct ifmcaddr6 *pmc;
726
727 /* this is an "ifmcaddr6" for convenience; only the fields below
728 * are actually used. In particular, the refcnt and users are not
729 * used for management of the delete list. Using the same structure
730 * for deleted items allows change reports to use common code with
731 * non-deleted or query-response MCA's.
732 */
733 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
734 if (!pmc)
735 return;
736
737 spin_lock_bh(&im->mca_lock);
738 spin_lock_init(&pmc->mca_lock);
739 pmc->idev = im->idev;
740 in6_dev_hold(idev);
741 pmc->mca_addr = im->mca_addr;
742 pmc->mca_crcount = idev->mc_qrv;
743 pmc->mca_sfmode = im->mca_sfmode;
744 if (pmc->mca_sfmode == MCAST_INCLUDE) {
745 struct ip6_sf_list *psf;
746
747 pmc->mca_tomb = im->mca_tomb;
748 pmc->mca_sources = im->mca_sources;
749 im->mca_tomb = im->mca_sources = NULL;
750 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
751 psf->sf_crcount = pmc->mca_crcount;
752 }
753 spin_unlock_bh(&im->mca_lock);
754
755 spin_lock_bh(&idev->mc_lock);
756 pmc->next = idev->mc_tomb;
757 idev->mc_tomb = pmc;
758 spin_unlock_bh(&idev->mc_lock);
759 }
760
761 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
762 {
763 struct ifmcaddr6 *pmc, *pmc_prev;
764 struct ip6_sf_list *psf, *psf_next;
765
766 spin_lock_bh(&idev->mc_lock);
767 pmc_prev = NULL;
768 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
769 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
770 break;
771 pmc_prev = pmc;
772 }
773 if (pmc) {
774 if (pmc_prev)
775 pmc_prev->next = pmc->next;
776 else
777 idev->mc_tomb = pmc->next;
778 }
779 spin_unlock_bh(&idev->mc_lock);
780
781 if (pmc) {
782 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
783 psf_next = psf->sf_next;
784 kfree(psf);
785 }
786 in6_dev_put(pmc->idev);
787 kfree(pmc);
788 }
789 }
790
791 static void mld_clear_delrec(struct inet6_dev *idev)
792 {
793 struct ifmcaddr6 *pmc, *nextpmc;
794
795 spin_lock_bh(&idev->mc_lock);
796 pmc = idev->mc_tomb;
797 idev->mc_tomb = NULL;
798 spin_unlock_bh(&idev->mc_lock);
799
800 for (; pmc; pmc = nextpmc) {
801 nextpmc = pmc->next;
802 ip6_mc_clear_src(pmc);
803 in6_dev_put(pmc->idev);
804 kfree(pmc);
805 }
806
807 /* clear dead sources, too */
808 read_lock_bh(&idev->lock);
809 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
810 struct ip6_sf_list *psf, *psf_next;
811
812 spin_lock_bh(&pmc->mca_lock);
813 psf = pmc->mca_tomb;
814 pmc->mca_tomb = NULL;
815 spin_unlock_bh(&pmc->mca_lock);
816 for (; psf; psf=psf_next) {
817 psf_next = psf->sf_next;
818 kfree(psf);
819 }
820 }
821 read_unlock_bh(&idev->lock);
822 }
823
824
825 /*
826 * device multicast group inc (add if not found)
827 */
828 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
829 {
830 struct ifmcaddr6 *mc;
831 struct inet6_dev *idev;
832
833 /* we need to take a reference on idev */
834 idev = in6_dev_get(dev);
835
836 if (idev == NULL)
837 return -EINVAL;
838
839 write_lock_bh(&idev->lock);
840 if (idev->dead) {
841 write_unlock_bh(&idev->lock);
842 in6_dev_put(idev);
843 return -ENODEV;
844 }
845
846 for (mc = idev->mc_list; mc; mc = mc->next) {
847 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
848 mc->mca_users++;
849 write_unlock_bh(&idev->lock);
850 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
851 NULL, 0);
852 in6_dev_put(idev);
853 return 0;
854 }
855 }
856
857 /*
858 * not found: create a new one.
859 */
860
861 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
862
863 if (mc == NULL) {
864 write_unlock_bh(&idev->lock);
865 in6_dev_put(idev);
866 return -ENOMEM;
867 }
868
869 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
870
871 mc->mca_addr = *addr;
872 mc->idev = idev; /* (reference taken) */
873 mc->mca_users = 1;
874 /* mca_stamp should be updated upon changes */
875 mc->mca_cstamp = mc->mca_tstamp = jiffies;
876 atomic_set(&mc->mca_refcnt, 2);
877 spin_lock_init(&mc->mca_lock);
878
879 /* initial mode is (EX, empty) */
880 mc->mca_sfmode = MCAST_EXCLUDE;
881 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
882
883 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
884 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
885 mc->mca_flags |= MAF_NOREPORT;
886
887 mc->next = idev->mc_list;
888 idev->mc_list = mc;
889 write_unlock_bh(&idev->lock);
890
891 mld_del_delrec(idev, &mc->mca_addr);
892 igmp6_group_added(mc);
893 ma_put(mc);
894 return 0;
895 }
896
897 /*
898 * device multicast group del
899 */
900 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
901 {
902 struct ifmcaddr6 *ma, **map;
903
904 write_lock_bh(&idev->lock);
905 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
906 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
907 if (--ma->mca_users == 0) {
908 *map = ma->next;
909 write_unlock_bh(&idev->lock);
910
911 igmp6_group_dropped(ma);
912
913 ma_put(ma);
914 return 0;
915 }
916 write_unlock_bh(&idev->lock);
917 return 0;
918 }
919 }
920 write_unlock_bh(&idev->lock);
921
922 return -ENOENT;
923 }
924
925 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
926 {
927 struct inet6_dev *idev;
928 int err;
929
930 rcu_read_lock();
931
932 idev = __in6_dev_get(dev);
933 if (!idev)
934 err = -ENODEV;
935 else
936 err = __ipv6_dev_mc_dec(idev, addr);
937
938 rcu_read_unlock();
939 return err;
940 }
941
942 /*
943 * check if the interface/address pair is valid
944 */
945 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
946 const struct in6_addr *src_addr)
947 {
948 struct inet6_dev *idev;
949 struct ifmcaddr6 *mc;
950 bool rv = false;
951
952 rcu_read_lock();
953 idev = __in6_dev_get(dev);
954 if (idev) {
955 read_lock_bh(&idev->lock);
956 for (mc = idev->mc_list; mc; mc=mc->next) {
957 if (ipv6_addr_equal(&mc->mca_addr, group))
958 break;
959 }
960 if (mc) {
961 if (src_addr && !ipv6_addr_any(src_addr)) {
962 struct ip6_sf_list *psf;
963
964 spin_lock_bh(&mc->mca_lock);
965 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
966 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
967 break;
968 }
969 if (psf)
970 rv = psf->sf_count[MCAST_INCLUDE] ||
971 psf->sf_count[MCAST_EXCLUDE] !=
972 mc->mca_sfcount[MCAST_EXCLUDE];
973 else
974 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
975 spin_unlock_bh(&mc->mca_lock);
976 } else
977 rv = true; /* don't filter unspecified source */
978 }
979 read_unlock_bh(&idev->lock);
980 }
981 rcu_read_unlock();
982 return rv;
983 }
984
985 static void mld_gq_start_timer(struct inet6_dev *idev)
986 {
987 int tv = net_random() % idev->mc_maxdelay;
988
989 idev->mc_gq_running = 1;
990 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
991 in6_dev_hold(idev);
992 }
993
994 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
995 {
996 int tv = net_random() % delay;
997
998 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
999 in6_dev_hold(idev);
1000 }
1001
1002 static void mld_dad_start_timer(struct inet6_dev *idev, int delay)
1003 {
1004 int tv = net_random() % delay;
1005
1006 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1007 in6_dev_hold(idev);
1008 }
1009
1010 /*
1011 * IGMP handling (alias multicast ICMPv6 messages)
1012 */
1013
1014 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1015 {
1016 unsigned long delay = resptime;
1017
1018 /* Do not start timer for these addresses */
1019 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1020 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1021 return;
1022
1023 if (del_timer(&ma->mca_timer)) {
1024 atomic_dec(&ma->mca_refcnt);
1025 delay = ma->mca_timer.expires - jiffies;
1026 }
1027
1028 if (delay >= resptime) {
1029 if (resptime)
1030 delay = net_random() % resptime;
1031 else
1032 delay = 1;
1033 }
1034 ma->mca_timer.expires = jiffies + delay;
1035 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1036 atomic_inc(&ma->mca_refcnt);
1037 ma->mca_flags |= MAF_TIMER_RUNNING;
1038 }
1039
1040 /* mark EXCLUDE-mode sources */
1041 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1042 const struct in6_addr *srcs)
1043 {
1044 struct ip6_sf_list *psf;
1045 int i, scount;
1046
1047 scount = 0;
1048 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1049 if (scount == nsrcs)
1050 break;
1051 for (i=0; i<nsrcs; i++) {
1052 /* skip inactive filters */
1053 if (psf->sf_count[MCAST_INCLUDE] ||
1054 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1055 psf->sf_count[MCAST_EXCLUDE])
1056 break;
1057 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1058 scount++;
1059 break;
1060 }
1061 }
1062 }
1063 pmc->mca_flags &= ~MAF_GSQUERY;
1064 if (scount == nsrcs) /* all sources excluded */
1065 return false;
1066 return true;
1067 }
1068
1069 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1070 const struct in6_addr *srcs)
1071 {
1072 struct ip6_sf_list *psf;
1073 int i, scount;
1074
1075 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1076 return mld_xmarksources(pmc, nsrcs, srcs);
1077
1078 /* mark INCLUDE-mode sources */
1079
1080 scount = 0;
1081 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1082 if (scount == nsrcs)
1083 break;
1084 for (i=0; i<nsrcs; i++) {
1085 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1086 psf->sf_gsresp = 1;
1087 scount++;
1088 break;
1089 }
1090 }
1091 }
1092 if (!scount) {
1093 pmc->mca_flags &= ~MAF_GSQUERY;
1094 return false;
1095 }
1096 pmc->mca_flags |= MAF_GSQUERY;
1097 return true;
1098 }
1099
1100 /* called with rcu_read_lock() */
1101 int igmp6_event_query(struct sk_buff *skb)
1102 {
1103 struct mld2_query *mlh2 = NULL;
1104 struct ifmcaddr6 *ma;
1105 const struct in6_addr *group;
1106 unsigned long max_delay;
1107 struct inet6_dev *idev;
1108 struct mld_msg *mld;
1109 int group_type;
1110 int mark = 0;
1111 int len;
1112
1113 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1114 return -EINVAL;
1115
1116 /* compute payload length excluding extension headers */
1117 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1118 len -= skb_network_header_len(skb);
1119
1120 /* Drop queries with not link local source */
1121 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1122 return -EINVAL;
1123
1124 idev = __in6_dev_get(skb->dev);
1125
1126 if (idev == NULL)
1127 return 0;
1128
1129 mld = (struct mld_msg *)icmp6_hdr(skb);
1130 group = &mld->mld_mca;
1131 group_type = ipv6_addr_type(group);
1132
1133 if (group_type != IPV6_ADDR_ANY &&
1134 !(group_type&IPV6_ADDR_MULTICAST))
1135 return -EINVAL;
1136
1137 if (len == 24) {
1138 int switchback;
1139 /* MLDv1 router present */
1140
1141 /* Translate milliseconds to jiffies */
1142 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1143
1144 switchback = (idev->mc_qrv + 1) * max_delay;
1145 idev->mc_v1_seen = jiffies + switchback;
1146
1147 /* cancel the interface change timer */
1148 idev->mc_ifc_count = 0;
1149 if (del_timer(&idev->mc_ifc_timer))
1150 __in6_dev_put(idev);
1151 /* clear deleted report items */
1152 mld_clear_delrec(idev);
1153 } else if (len >= 28) {
1154 int srcs_offset = sizeof(struct mld2_query) -
1155 sizeof(struct icmp6hdr);
1156 if (!pskb_may_pull(skb, srcs_offset))
1157 return -EINVAL;
1158
1159 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1160 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1161 if (!max_delay)
1162 max_delay = 1;
1163 idev->mc_maxdelay = max_delay;
1164 if (mlh2->mld2q_qrv)
1165 idev->mc_qrv = mlh2->mld2q_qrv;
1166 if (group_type == IPV6_ADDR_ANY) { /* general query */
1167 if (mlh2->mld2q_nsrcs)
1168 return -EINVAL; /* no sources allowed */
1169
1170 mld_gq_start_timer(idev);
1171 return 0;
1172 }
1173 /* mark sources to include, if group & source-specific */
1174 if (mlh2->mld2q_nsrcs != 0) {
1175 if (!pskb_may_pull(skb, srcs_offset +
1176 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1177 return -EINVAL;
1178
1179 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1180 mark = 1;
1181 }
1182 } else
1183 return -EINVAL;
1184
1185 read_lock_bh(&idev->lock);
1186 if (group_type == IPV6_ADDR_ANY) {
1187 for (ma = idev->mc_list; ma; ma=ma->next) {
1188 spin_lock_bh(&ma->mca_lock);
1189 igmp6_group_queried(ma, max_delay);
1190 spin_unlock_bh(&ma->mca_lock);
1191 }
1192 } else {
1193 for (ma = idev->mc_list; ma; ma=ma->next) {
1194 if (!ipv6_addr_equal(group, &ma->mca_addr))
1195 continue;
1196 spin_lock_bh(&ma->mca_lock);
1197 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1198 /* gsquery <- gsquery && mark */
1199 if (!mark)
1200 ma->mca_flags &= ~MAF_GSQUERY;
1201 } else {
1202 /* gsquery <- mark */
1203 if (mark)
1204 ma->mca_flags |= MAF_GSQUERY;
1205 else
1206 ma->mca_flags &= ~MAF_GSQUERY;
1207 }
1208 if (!(ma->mca_flags & MAF_GSQUERY) ||
1209 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1210 igmp6_group_queried(ma, max_delay);
1211 spin_unlock_bh(&ma->mca_lock);
1212 break;
1213 }
1214 }
1215 read_unlock_bh(&idev->lock);
1216
1217 return 0;
1218 }
1219
1220 /* called with rcu_read_lock() */
1221 int igmp6_event_report(struct sk_buff *skb)
1222 {
1223 struct ifmcaddr6 *ma;
1224 struct inet6_dev *idev;
1225 struct mld_msg *mld;
1226 int addr_type;
1227
1228 /* Our own report looped back. Ignore it. */
1229 if (skb->pkt_type == PACKET_LOOPBACK)
1230 return 0;
1231
1232 /* send our report if the MC router may not have heard this report */
1233 if (skb->pkt_type != PACKET_MULTICAST &&
1234 skb->pkt_type != PACKET_BROADCAST)
1235 return 0;
1236
1237 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1238 return -EINVAL;
1239
1240 mld = (struct mld_msg *)icmp6_hdr(skb);
1241
1242 /* Drop reports with not link local source */
1243 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1244 if (addr_type != IPV6_ADDR_ANY &&
1245 !(addr_type&IPV6_ADDR_LINKLOCAL))
1246 return -EINVAL;
1247
1248 idev = __in6_dev_get(skb->dev);
1249 if (idev == NULL)
1250 return -ENODEV;
1251
1252 /*
1253 * Cancel the timer for this group
1254 */
1255
1256 read_lock_bh(&idev->lock);
1257 for (ma = idev->mc_list; ma; ma=ma->next) {
1258 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1259 spin_lock(&ma->mca_lock);
1260 if (del_timer(&ma->mca_timer))
1261 atomic_dec(&ma->mca_refcnt);
1262 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1263 spin_unlock(&ma->mca_lock);
1264 break;
1265 }
1266 }
1267 read_unlock_bh(&idev->lock);
1268 return 0;
1269 }
1270
1271 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1272 int gdeleted, int sdeleted)
1273 {
1274 switch (type) {
1275 case MLD2_MODE_IS_INCLUDE:
1276 case MLD2_MODE_IS_EXCLUDE:
1277 if (gdeleted || sdeleted)
1278 return false;
1279 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1280 if (pmc->mca_sfmode == MCAST_INCLUDE)
1281 return true;
1282 /* don't include if this source is excluded
1283 * in all filters
1284 */
1285 if (psf->sf_count[MCAST_INCLUDE])
1286 return type == MLD2_MODE_IS_INCLUDE;
1287 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1288 psf->sf_count[MCAST_EXCLUDE];
1289 }
1290 return false;
1291 case MLD2_CHANGE_TO_INCLUDE:
1292 if (gdeleted || sdeleted)
1293 return false;
1294 return psf->sf_count[MCAST_INCLUDE] != 0;
1295 case MLD2_CHANGE_TO_EXCLUDE:
1296 if (gdeleted || sdeleted)
1297 return false;
1298 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1299 psf->sf_count[MCAST_INCLUDE])
1300 return false;
1301 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1302 psf->sf_count[MCAST_EXCLUDE];
1303 case MLD2_ALLOW_NEW_SOURCES:
1304 if (gdeleted || !psf->sf_crcount)
1305 return false;
1306 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1307 case MLD2_BLOCK_OLD_SOURCES:
1308 if (pmc->mca_sfmode == MCAST_INCLUDE)
1309 return gdeleted || (psf->sf_crcount && sdeleted);
1310 return psf->sf_crcount && !gdeleted && !sdeleted;
1311 }
1312 return false;
1313 }
1314
1315 static int
1316 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1317 {
1318 struct ip6_sf_list *psf;
1319 int scount = 0;
1320
1321 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1322 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1323 continue;
1324 scount++;
1325 }
1326 return scount;
1327 }
1328
1329 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1330 struct net_device *dev,
1331 const struct in6_addr *saddr,
1332 const struct in6_addr *daddr,
1333 int proto, int len)
1334 {
1335 struct ipv6hdr *hdr;
1336
1337 skb->protocol = htons(ETH_P_IPV6);
1338 skb->dev = dev;
1339
1340 skb_reset_network_header(skb);
1341 skb_put(skb, sizeof(struct ipv6hdr));
1342 hdr = ipv6_hdr(skb);
1343
1344 ip6_flow_hdr(hdr, 0, 0);
1345
1346 hdr->payload_len = htons(len);
1347 hdr->nexthdr = proto;
1348 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1349
1350 hdr->saddr = *saddr;
1351 hdr->daddr = *daddr;
1352 }
1353
1354 static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1355 {
1356 struct net_device *dev = idev->dev;
1357 struct net *net = dev_net(dev);
1358 struct sock *sk = net->ipv6.igmp_sk;
1359 struct sk_buff *skb;
1360 struct mld2_report *pmr;
1361 struct in6_addr addr_buf;
1362 const struct in6_addr *saddr;
1363 int hlen = LL_RESERVED_SPACE(dev);
1364 int tlen = dev->needed_tailroom;
1365 int err;
1366 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1367 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1368 IPV6_TLV_PADN, 0 };
1369
1370 /* we assume size > sizeof(ra) here */
1371 size += hlen + tlen;
1372 /* limit our allocations to order-0 page */
1373 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1374 skb = sock_alloc_send_skb(sk, size, 1, &err);
1375
1376 if (!skb)
1377 return NULL;
1378
1379 skb_reserve(skb, hlen);
1380
1381 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1382 /* <draft-ietf-magma-mld-source-05.txt>:
1383 * use unspecified address as the source address
1384 * when a valid link-local address is not available.
1385 */
1386 saddr = &in6addr_any;
1387 } else
1388 saddr = &addr_buf;
1389
1390 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1391
1392 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1393
1394 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1395 skb_put(skb, sizeof(*pmr));
1396 pmr = (struct mld2_report *)skb_transport_header(skb);
1397 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1398 pmr->mld2r_resv1 = 0;
1399 pmr->mld2r_cksum = 0;
1400 pmr->mld2r_resv2 = 0;
1401 pmr->mld2r_ngrec = 0;
1402 return skb;
1403 }
1404
1405 static void mld_sendpack(struct sk_buff *skb)
1406 {
1407 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1408 struct mld2_report *pmr =
1409 (struct mld2_report *)skb_transport_header(skb);
1410 int payload_len, mldlen;
1411 struct inet6_dev *idev;
1412 struct net *net = dev_net(skb->dev);
1413 int err;
1414 struct flowi6 fl6;
1415 struct dst_entry *dst;
1416
1417 rcu_read_lock();
1418 idev = __in6_dev_get(skb->dev);
1419 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1420
1421 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1422 sizeof(*pip6);
1423 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1424 pip6->payload_len = htons(payload_len);
1425
1426 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1427 IPPROTO_ICMPV6,
1428 csum_partial(skb_transport_header(skb),
1429 mldlen, 0));
1430
1431 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1432 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1433 skb->dev->ifindex);
1434 dst = icmp6_dst_alloc(skb->dev, &fl6);
1435
1436 err = 0;
1437 if (IS_ERR(dst)) {
1438 err = PTR_ERR(dst);
1439 dst = NULL;
1440 }
1441 skb_dst_set(skb, dst);
1442 if (err)
1443 goto err_out;
1444
1445 payload_len = skb->len;
1446
1447 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1448 dst_output);
1449 out:
1450 if (!err) {
1451 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1452 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1453 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1454 } else
1455 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1456
1457 rcu_read_unlock();
1458 return;
1459
1460 err_out:
1461 kfree_skb(skb);
1462 goto out;
1463 }
1464
1465 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1466 {
1467 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1468 }
1469
1470 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1471 int type, struct mld2_grec **ppgr)
1472 {
1473 struct net_device *dev = pmc->idev->dev;
1474 struct mld2_report *pmr;
1475 struct mld2_grec *pgr;
1476
1477 if (!skb)
1478 skb = mld_newpack(pmc->idev, dev->mtu);
1479 if (!skb)
1480 return NULL;
1481 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1482 pgr->grec_type = type;
1483 pgr->grec_auxwords = 0;
1484 pgr->grec_nsrcs = 0;
1485 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1486 pmr = (struct mld2_report *)skb_transport_header(skb);
1487 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1488 *ppgr = pgr;
1489 return skb;
1490 }
1491
1492 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1493 skb_tailroom(skb)) : 0)
1494
1495 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1496 int type, int gdeleted, int sdeleted)
1497 {
1498 struct inet6_dev *idev = pmc->idev;
1499 struct net_device *dev = idev->dev;
1500 struct mld2_report *pmr;
1501 struct mld2_grec *pgr = NULL;
1502 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1503 int scount, stotal, first, isquery, truncate;
1504
1505 if (pmc->mca_flags & MAF_NOREPORT)
1506 return skb;
1507
1508 isquery = type == MLD2_MODE_IS_INCLUDE ||
1509 type == MLD2_MODE_IS_EXCLUDE;
1510 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1511 type == MLD2_CHANGE_TO_EXCLUDE;
1512
1513 stotal = scount = 0;
1514
1515 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1516
1517 if (!*psf_list)
1518 goto empty_source;
1519
1520 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1521
1522 /* EX and TO_EX get a fresh packet, if needed */
1523 if (truncate) {
1524 if (pmr && pmr->mld2r_ngrec &&
1525 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1526 if (skb)
1527 mld_sendpack(skb);
1528 skb = mld_newpack(idev, dev->mtu);
1529 }
1530 }
1531 first = 1;
1532 psf_prev = NULL;
1533 for (psf=*psf_list; psf; psf=psf_next) {
1534 struct in6_addr *psrc;
1535
1536 psf_next = psf->sf_next;
1537
1538 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1539 psf_prev = psf;
1540 continue;
1541 }
1542
1543 /* clear marks on query responses */
1544 if (isquery)
1545 psf->sf_gsresp = 0;
1546
1547 if (AVAILABLE(skb) < sizeof(*psrc) +
1548 first*sizeof(struct mld2_grec)) {
1549 if (truncate && !first)
1550 break; /* truncate these */
1551 if (pgr)
1552 pgr->grec_nsrcs = htons(scount);
1553 if (skb)
1554 mld_sendpack(skb);
1555 skb = mld_newpack(idev, dev->mtu);
1556 first = 1;
1557 scount = 0;
1558 }
1559 if (first) {
1560 skb = add_grhead(skb, pmc, type, &pgr);
1561 first = 0;
1562 }
1563 if (!skb)
1564 return NULL;
1565 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1566 *psrc = psf->sf_addr;
1567 scount++; stotal++;
1568 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1569 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1570 psf->sf_crcount--;
1571 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1572 if (psf_prev)
1573 psf_prev->sf_next = psf->sf_next;
1574 else
1575 *psf_list = psf->sf_next;
1576 kfree(psf);
1577 continue;
1578 }
1579 }
1580 psf_prev = psf;
1581 }
1582
1583 empty_source:
1584 if (!stotal) {
1585 if (type == MLD2_ALLOW_NEW_SOURCES ||
1586 type == MLD2_BLOCK_OLD_SOURCES)
1587 return skb;
1588 if (pmc->mca_crcount || isquery) {
1589 /* make sure we have room for group header */
1590 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1591 mld_sendpack(skb);
1592 skb = NULL; /* add_grhead will get a new one */
1593 }
1594 skb = add_grhead(skb, pmc, type, &pgr);
1595 }
1596 }
1597 if (pgr)
1598 pgr->grec_nsrcs = htons(scount);
1599
1600 if (isquery)
1601 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1602 return skb;
1603 }
1604
1605 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1606 {
1607 struct sk_buff *skb = NULL;
1608 int type;
1609
1610 read_lock_bh(&idev->lock);
1611 if (!pmc) {
1612 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1613 if (pmc->mca_flags & MAF_NOREPORT)
1614 continue;
1615 spin_lock_bh(&pmc->mca_lock);
1616 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1617 type = MLD2_MODE_IS_EXCLUDE;
1618 else
1619 type = MLD2_MODE_IS_INCLUDE;
1620 skb = add_grec(skb, pmc, type, 0, 0);
1621 spin_unlock_bh(&pmc->mca_lock);
1622 }
1623 } else {
1624 spin_lock_bh(&pmc->mca_lock);
1625 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1626 type = MLD2_MODE_IS_EXCLUDE;
1627 else
1628 type = MLD2_MODE_IS_INCLUDE;
1629 skb = add_grec(skb, pmc, type, 0, 0);
1630 spin_unlock_bh(&pmc->mca_lock);
1631 }
1632 read_unlock_bh(&idev->lock);
1633 if (skb)
1634 mld_sendpack(skb);
1635 }
1636
1637 /*
1638 * remove zero-count source records from a source filter list
1639 */
1640 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1641 {
1642 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1643
1644 psf_prev = NULL;
1645 for (psf=*ppsf; psf; psf = psf_next) {
1646 psf_next = psf->sf_next;
1647 if (psf->sf_crcount == 0) {
1648 if (psf_prev)
1649 psf_prev->sf_next = psf->sf_next;
1650 else
1651 *ppsf = psf->sf_next;
1652 kfree(psf);
1653 } else
1654 psf_prev = psf;
1655 }
1656 }
1657
1658 static void mld_send_cr(struct inet6_dev *idev)
1659 {
1660 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1661 struct sk_buff *skb = NULL;
1662 int type, dtype;
1663
1664 read_lock_bh(&idev->lock);
1665 spin_lock(&idev->mc_lock);
1666
1667 /* deleted MCA's */
1668 pmc_prev = NULL;
1669 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1670 pmc_next = pmc->next;
1671 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1672 type = MLD2_BLOCK_OLD_SOURCES;
1673 dtype = MLD2_BLOCK_OLD_SOURCES;
1674 skb = add_grec(skb, pmc, type, 1, 0);
1675 skb = add_grec(skb, pmc, dtype, 1, 1);
1676 }
1677 if (pmc->mca_crcount) {
1678 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1679 type = MLD2_CHANGE_TO_INCLUDE;
1680 skb = add_grec(skb, pmc, type, 1, 0);
1681 }
1682 pmc->mca_crcount--;
1683 if (pmc->mca_crcount == 0) {
1684 mld_clear_zeros(&pmc->mca_tomb);
1685 mld_clear_zeros(&pmc->mca_sources);
1686 }
1687 }
1688 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1689 !pmc->mca_sources) {
1690 if (pmc_prev)
1691 pmc_prev->next = pmc_next;
1692 else
1693 idev->mc_tomb = pmc_next;
1694 in6_dev_put(pmc->idev);
1695 kfree(pmc);
1696 } else
1697 pmc_prev = pmc;
1698 }
1699 spin_unlock(&idev->mc_lock);
1700
1701 /* change recs */
1702 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1703 spin_lock_bh(&pmc->mca_lock);
1704 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1705 type = MLD2_BLOCK_OLD_SOURCES;
1706 dtype = MLD2_ALLOW_NEW_SOURCES;
1707 } else {
1708 type = MLD2_ALLOW_NEW_SOURCES;
1709 dtype = MLD2_BLOCK_OLD_SOURCES;
1710 }
1711 skb = add_grec(skb, pmc, type, 0, 0);
1712 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1713
1714 /* filter mode changes */
1715 if (pmc->mca_crcount) {
1716 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1717 type = MLD2_CHANGE_TO_EXCLUDE;
1718 else
1719 type = MLD2_CHANGE_TO_INCLUDE;
1720 skb = add_grec(skb, pmc, type, 0, 0);
1721 pmc->mca_crcount--;
1722 }
1723 spin_unlock_bh(&pmc->mca_lock);
1724 }
1725 read_unlock_bh(&idev->lock);
1726 if (!skb)
1727 return;
1728 (void) mld_sendpack(skb);
1729 }
1730
1731 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1732 {
1733 struct net *net = dev_net(dev);
1734 struct sock *sk = net->ipv6.igmp_sk;
1735 struct inet6_dev *idev;
1736 struct sk_buff *skb;
1737 struct mld_msg *hdr;
1738 const struct in6_addr *snd_addr, *saddr;
1739 struct in6_addr addr_buf;
1740 int hlen = LL_RESERVED_SPACE(dev);
1741 int tlen = dev->needed_tailroom;
1742 int err, len, payload_len, full_len;
1743 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1744 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1745 IPV6_TLV_PADN, 0 };
1746 struct flowi6 fl6;
1747 struct dst_entry *dst;
1748
1749 if (type == ICMPV6_MGM_REDUCTION)
1750 snd_addr = &in6addr_linklocal_allrouters;
1751 else
1752 snd_addr = addr;
1753
1754 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1755 payload_len = len + sizeof(ra);
1756 full_len = sizeof(struct ipv6hdr) + payload_len;
1757
1758 rcu_read_lock();
1759 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1760 IPSTATS_MIB_OUT, full_len);
1761 rcu_read_unlock();
1762
1763 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1764
1765 if (skb == NULL) {
1766 rcu_read_lock();
1767 IP6_INC_STATS(net, __in6_dev_get(dev),
1768 IPSTATS_MIB_OUTDISCARDS);
1769 rcu_read_unlock();
1770 return;
1771 }
1772
1773 skb_reserve(skb, hlen);
1774
1775 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1776 /* <draft-ietf-magma-mld-source-05.txt>:
1777 * use unspecified address as the source address
1778 * when a valid link-local address is not available.
1779 */
1780 saddr = &in6addr_any;
1781 } else
1782 saddr = &addr_buf;
1783
1784 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1785
1786 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1787
1788 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1789 memset(hdr, 0, sizeof(struct mld_msg));
1790 hdr->mld_type = type;
1791 hdr->mld_mca = *addr;
1792
1793 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1794 IPPROTO_ICMPV6,
1795 csum_partial(hdr, len, 0));
1796
1797 rcu_read_lock();
1798 idev = __in6_dev_get(skb->dev);
1799
1800 icmpv6_flow_init(sk, &fl6, type,
1801 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1802 skb->dev->ifindex);
1803 dst = icmp6_dst_alloc(skb->dev, &fl6);
1804 if (IS_ERR(dst)) {
1805 err = PTR_ERR(dst);
1806 goto err_out;
1807 }
1808
1809 skb_dst_set(skb, dst);
1810 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1811 dst_output);
1812 out:
1813 if (!err) {
1814 ICMP6MSGOUT_INC_STATS(net, idev, type);
1815 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1816 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1817 } else
1818 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1819
1820 rcu_read_unlock();
1821 return;
1822
1823 err_out:
1824 kfree_skb(skb);
1825 goto out;
1826 }
1827
1828 static void mld_resend_report(struct inet6_dev *idev)
1829 {
1830 if (MLD_V1_SEEN(idev)) {
1831 struct ifmcaddr6 *mcaddr;
1832 read_lock_bh(&idev->lock);
1833 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1834 if (!(mcaddr->mca_flags & MAF_NOREPORT))
1835 igmp6_send(&mcaddr->mca_addr, idev->dev,
1836 ICMPV6_MGM_REPORT);
1837 }
1838 read_unlock_bh(&idev->lock);
1839 } else {
1840 mld_send_report(idev, NULL);
1841 }
1842 }
1843
1844 void ipv6_mc_dad_complete(struct inet6_dev *idev)
1845 {
1846 idev->mc_dad_count = idev->mc_qrv;
1847 if (idev->mc_dad_count) {
1848 mld_resend_report(idev);
1849 idev->mc_dad_count--;
1850 if (idev->mc_dad_count)
1851 mld_dad_start_timer(idev, idev->mc_maxdelay);
1852 }
1853 }
1854
1855 static void mld_dad_timer_expire(unsigned long data)
1856 {
1857 struct inet6_dev *idev = (struct inet6_dev *)data;
1858
1859 mld_resend_report(idev);
1860 if (idev->mc_dad_count) {
1861 idev->mc_dad_count--;
1862 if (idev->mc_dad_count)
1863 mld_dad_start_timer(idev, idev->mc_maxdelay);
1864 }
1865 __in6_dev_put(idev);
1866 }
1867
1868 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1869 const struct in6_addr *psfsrc)
1870 {
1871 struct ip6_sf_list *psf, *psf_prev;
1872 int rv = 0;
1873
1874 psf_prev = NULL;
1875 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1876 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1877 break;
1878 psf_prev = psf;
1879 }
1880 if (!psf || psf->sf_count[sfmode] == 0) {
1881 /* source filter not found, or count wrong => bug */
1882 return -ESRCH;
1883 }
1884 psf->sf_count[sfmode]--;
1885 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1886 struct inet6_dev *idev = pmc->idev;
1887
1888 /* no more filters for this source */
1889 if (psf_prev)
1890 psf_prev->sf_next = psf->sf_next;
1891 else
1892 pmc->mca_sources = psf->sf_next;
1893 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1894 !MLD_V1_SEEN(idev)) {
1895 psf->sf_crcount = idev->mc_qrv;
1896 psf->sf_next = pmc->mca_tomb;
1897 pmc->mca_tomb = psf;
1898 rv = 1;
1899 } else
1900 kfree(psf);
1901 }
1902 return rv;
1903 }
1904
1905 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1906 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1907 int delta)
1908 {
1909 struct ifmcaddr6 *pmc;
1910 int changerec = 0;
1911 int i, err;
1912
1913 if (!idev)
1914 return -ENODEV;
1915 read_lock_bh(&idev->lock);
1916 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1917 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1918 break;
1919 }
1920 if (!pmc) {
1921 /* MCA not found?? bug */
1922 read_unlock_bh(&idev->lock);
1923 return -ESRCH;
1924 }
1925 spin_lock_bh(&pmc->mca_lock);
1926 sf_markstate(pmc);
1927 if (!delta) {
1928 if (!pmc->mca_sfcount[sfmode]) {
1929 spin_unlock_bh(&pmc->mca_lock);
1930 read_unlock_bh(&idev->lock);
1931 return -EINVAL;
1932 }
1933 pmc->mca_sfcount[sfmode]--;
1934 }
1935 err = 0;
1936 for (i=0; i<sfcount; i++) {
1937 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1938
1939 changerec |= rv > 0;
1940 if (!err && rv < 0)
1941 err = rv;
1942 }
1943 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1944 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1945 pmc->mca_sfcount[MCAST_INCLUDE]) {
1946 struct ip6_sf_list *psf;
1947
1948 /* filter mode change */
1949 pmc->mca_sfmode = MCAST_INCLUDE;
1950 pmc->mca_crcount = idev->mc_qrv;
1951 idev->mc_ifc_count = pmc->mca_crcount;
1952 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1953 psf->sf_crcount = 0;
1954 mld_ifc_event(pmc->idev);
1955 } else if (sf_setstate(pmc) || changerec)
1956 mld_ifc_event(pmc->idev);
1957 spin_unlock_bh(&pmc->mca_lock);
1958 read_unlock_bh(&idev->lock);
1959 return err;
1960 }
1961
1962 /*
1963 * Add multicast single-source filter to the interface list
1964 */
1965 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1966 const struct in6_addr *psfsrc)
1967 {
1968 struct ip6_sf_list *psf, *psf_prev;
1969
1970 psf_prev = NULL;
1971 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1972 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1973 break;
1974 psf_prev = psf;
1975 }
1976 if (!psf) {
1977 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1978 if (!psf)
1979 return -ENOBUFS;
1980
1981 psf->sf_addr = *psfsrc;
1982 if (psf_prev) {
1983 psf_prev->sf_next = psf;
1984 } else
1985 pmc->mca_sources = psf;
1986 }
1987 psf->sf_count[sfmode]++;
1988 return 0;
1989 }
1990
1991 static void sf_markstate(struct ifmcaddr6 *pmc)
1992 {
1993 struct ip6_sf_list *psf;
1994 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1995
1996 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1997 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1998 psf->sf_oldin = mca_xcount ==
1999 psf->sf_count[MCAST_EXCLUDE] &&
2000 !psf->sf_count[MCAST_INCLUDE];
2001 } else
2002 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2003 }
2004
2005 static int sf_setstate(struct ifmcaddr6 *pmc)
2006 {
2007 struct ip6_sf_list *psf, *dpsf;
2008 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2009 int qrv = pmc->idev->mc_qrv;
2010 int new_in, rv;
2011
2012 rv = 0;
2013 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2014 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2015 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2016 !psf->sf_count[MCAST_INCLUDE];
2017 } else
2018 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2019 if (new_in) {
2020 if (!psf->sf_oldin) {
2021 struct ip6_sf_list *prev = NULL;
2022
2023 for (dpsf=pmc->mca_tomb; dpsf;
2024 dpsf=dpsf->sf_next) {
2025 if (ipv6_addr_equal(&dpsf->sf_addr,
2026 &psf->sf_addr))
2027 break;
2028 prev = dpsf;
2029 }
2030 if (dpsf) {
2031 if (prev)
2032 prev->sf_next = dpsf->sf_next;
2033 else
2034 pmc->mca_tomb = dpsf->sf_next;
2035 kfree(dpsf);
2036 }
2037 psf->sf_crcount = qrv;
2038 rv++;
2039 }
2040 } else if (psf->sf_oldin) {
2041 psf->sf_crcount = 0;
2042 /*
2043 * add or update "delete" records if an active filter
2044 * is now inactive
2045 */
2046 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2047 if (ipv6_addr_equal(&dpsf->sf_addr,
2048 &psf->sf_addr))
2049 break;
2050 if (!dpsf) {
2051 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2052 if (!dpsf)
2053 continue;
2054 *dpsf = *psf;
2055 /* pmc->mca_lock held by callers */
2056 dpsf->sf_next = pmc->mca_tomb;
2057 pmc->mca_tomb = dpsf;
2058 }
2059 dpsf->sf_crcount = qrv;
2060 rv++;
2061 }
2062 }
2063 return rv;
2064 }
2065
2066 /*
2067 * Add multicast source filter list to the interface list
2068 */
2069 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2070 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2071 int delta)
2072 {
2073 struct ifmcaddr6 *pmc;
2074 int isexclude;
2075 int i, err;
2076
2077 if (!idev)
2078 return -ENODEV;
2079 read_lock_bh(&idev->lock);
2080 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2081 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2082 break;
2083 }
2084 if (!pmc) {
2085 /* MCA not found?? bug */
2086 read_unlock_bh(&idev->lock);
2087 return -ESRCH;
2088 }
2089 spin_lock_bh(&pmc->mca_lock);
2090
2091 sf_markstate(pmc);
2092 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2093 if (!delta)
2094 pmc->mca_sfcount[sfmode]++;
2095 err = 0;
2096 for (i=0; i<sfcount; i++) {
2097 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2098 if (err)
2099 break;
2100 }
2101 if (err) {
2102 int j;
2103
2104 if (!delta)
2105 pmc->mca_sfcount[sfmode]--;
2106 for (j=0; j<i; j++)
2107 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2108 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2109 struct ip6_sf_list *psf;
2110
2111 /* filter mode change */
2112 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2113 pmc->mca_sfmode = MCAST_EXCLUDE;
2114 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2115 pmc->mca_sfmode = MCAST_INCLUDE;
2116 /* else no filters; keep old mode for reports */
2117
2118 pmc->mca_crcount = idev->mc_qrv;
2119 idev->mc_ifc_count = pmc->mca_crcount;
2120 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2121 psf->sf_crcount = 0;
2122 mld_ifc_event(idev);
2123 } else if (sf_setstate(pmc))
2124 mld_ifc_event(idev);
2125 spin_unlock_bh(&pmc->mca_lock);
2126 read_unlock_bh(&idev->lock);
2127 return err;
2128 }
2129
2130 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2131 {
2132 struct ip6_sf_list *psf, *nextpsf;
2133
2134 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2135 nextpsf = psf->sf_next;
2136 kfree(psf);
2137 }
2138 pmc->mca_tomb = NULL;
2139 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2140 nextpsf = psf->sf_next;
2141 kfree(psf);
2142 }
2143 pmc->mca_sources = NULL;
2144 pmc->mca_sfmode = MCAST_EXCLUDE;
2145 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2146 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2147 }
2148
2149
2150 static void igmp6_join_group(struct ifmcaddr6 *ma)
2151 {
2152 unsigned long delay;
2153
2154 if (ma->mca_flags & MAF_NOREPORT)
2155 return;
2156
2157 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2158
2159 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2160
2161 spin_lock_bh(&ma->mca_lock);
2162 if (del_timer(&ma->mca_timer)) {
2163 atomic_dec(&ma->mca_refcnt);
2164 delay = ma->mca_timer.expires - jiffies;
2165 }
2166
2167 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2168 atomic_inc(&ma->mca_refcnt);
2169 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2170 spin_unlock_bh(&ma->mca_lock);
2171 }
2172
2173 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2174 struct inet6_dev *idev)
2175 {
2176 int err;
2177
2178 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2179 * so no other readers or writers of iml or its sflist
2180 */
2181 if (!iml->sflist) {
2182 /* any-source empty exclude case */
2183 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2184 }
2185 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2186 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2187 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2188 iml->sflist = NULL;
2189 return err;
2190 }
2191
2192 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2193 {
2194 if (MLD_V1_SEEN(ma->idev)) {
2195 if (ma->mca_flags & MAF_LAST_REPORTER)
2196 igmp6_send(&ma->mca_addr, ma->idev->dev,
2197 ICMPV6_MGM_REDUCTION);
2198 } else {
2199 mld_add_delrec(ma->idev, ma);
2200 mld_ifc_event(ma->idev);
2201 }
2202 }
2203
2204 static void mld_gq_timer_expire(unsigned long data)
2205 {
2206 struct inet6_dev *idev = (struct inet6_dev *)data;
2207
2208 idev->mc_gq_running = 0;
2209 mld_send_report(idev, NULL);
2210 __in6_dev_put(idev);
2211 }
2212
2213 static void mld_ifc_timer_expire(unsigned long data)
2214 {
2215 struct inet6_dev *idev = (struct inet6_dev *)data;
2216
2217 mld_send_cr(idev);
2218 if (idev->mc_ifc_count) {
2219 idev->mc_ifc_count--;
2220 if (idev->mc_ifc_count)
2221 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2222 }
2223 __in6_dev_put(idev);
2224 }
2225
2226 static void mld_ifc_event(struct inet6_dev *idev)
2227 {
2228 if (MLD_V1_SEEN(idev))
2229 return;
2230 idev->mc_ifc_count = idev->mc_qrv;
2231 mld_ifc_start_timer(idev, 1);
2232 }
2233
2234
2235 static void igmp6_timer_handler(unsigned long data)
2236 {
2237 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2238
2239 if (MLD_V1_SEEN(ma->idev))
2240 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2241 else
2242 mld_send_report(ma->idev, ma);
2243
2244 spin_lock(&ma->mca_lock);
2245 ma->mca_flags |= MAF_LAST_REPORTER;
2246 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2247 spin_unlock(&ma->mca_lock);
2248 ma_put(ma);
2249 }
2250
2251 /* Device changing type */
2252
2253 void ipv6_mc_unmap(struct inet6_dev *idev)
2254 {
2255 struct ifmcaddr6 *i;
2256
2257 /* Install multicast list, except for all-nodes (already installed) */
2258
2259 read_lock_bh(&idev->lock);
2260 for (i = idev->mc_list; i; i = i->next)
2261 igmp6_group_dropped(i);
2262 read_unlock_bh(&idev->lock);
2263 }
2264
2265 void ipv6_mc_remap(struct inet6_dev *idev)
2266 {
2267 ipv6_mc_up(idev);
2268 }
2269
2270 /* Device going down */
2271
2272 void ipv6_mc_down(struct inet6_dev *idev)
2273 {
2274 struct ifmcaddr6 *i;
2275
2276 /* Withdraw multicast list */
2277
2278 read_lock_bh(&idev->lock);
2279 idev->mc_ifc_count = 0;
2280 if (del_timer(&idev->mc_ifc_timer))
2281 __in6_dev_put(idev);
2282 idev->mc_gq_running = 0;
2283 if (del_timer(&idev->mc_gq_timer))
2284 __in6_dev_put(idev);
2285 if (del_timer(&idev->mc_dad_timer))
2286 __in6_dev_put(idev);
2287
2288 for (i = idev->mc_list; i; i=i->next)
2289 igmp6_group_dropped(i);
2290 read_unlock_bh(&idev->lock);
2291
2292 mld_clear_delrec(idev);
2293 }
2294
2295
2296 /* Device going up */
2297
2298 void ipv6_mc_up(struct inet6_dev *idev)
2299 {
2300 struct ifmcaddr6 *i;
2301
2302 /* Install multicast list, except for all-nodes (already installed) */
2303
2304 read_lock_bh(&idev->lock);
2305 for (i = idev->mc_list; i; i=i->next)
2306 igmp6_group_added(i);
2307 read_unlock_bh(&idev->lock);
2308 }
2309
2310 /* IPv6 device initialization. */
2311
2312 void ipv6_mc_init_dev(struct inet6_dev *idev)
2313 {
2314 write_lock_bh(&idev->lock);
2315 spin_lock_init(&idev->mc_lock);
2316 idev->mc_gq_running = 0;
2317 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2318 (unsigned long)idev);
2319 idev->mc_tomb = NULL;
2320 idev->mc_ifc_count = 0;
2321 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2322 (unsigned long)idev);
2323 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2324 (unsigned long)idev);
2325 idev->mc_qrv = MLD_QRV_DEFAULT;
2326 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2327 idev->mc_v1_seen = 0;
2328 write_unlock_bh(&idev->lock);
2329 }
2330
2331 /*
2332 * Device is about to be destroyed: clean up.
2333 */
2334
2335 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2336 {
2337 struct ifmcaddr6 *i;
2338
2339 /* Deactivate timers */
2340 ipv6_mc_down(idev);
2341
2342 /* Delete all-nodes address. */
2343 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2344 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2345 * fail.
2346 */
2347 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2348
2349 if (idev->cnf.forwarding)
2350 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2351
2352 write_lock_bh(&idev->lock);
2353 while ((i = idev->mc_list) != NULL) {
2354 idev->mc_list = i->next;
2355 write_unlock_bh(&idev->lock);
2356
2357 igmp6_group_dropped(i);
2358 ma_put(i);
2359
2360 write_lock_bh(&idev->lock);
2361 }
2362 write_unlock_bh(&idev->lock);
2363 }
2364
2365 #ifdef CONFIG_PROC_FS
2366 struct igmp6_mc_iter_state {
2367 struct seq_net_private p;
2368 struct net_device *dev;
2369 struct inet6_dev *idev;
2370 };
2371
2372 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2373
2374 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2375 {
2376 struct ifmcaddr6 *im = NULL;
2377 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2378 struct net *net = seq_file_net(seq);
2379
2380 state->idev = NULL;
2381 for_each_netdev_rcu(net, state->dev) {
2382 struct inet6_dev *idev;
2383 idev = __in6_dev_get(state->dev);
2384 if (!idev)
2385 continue;
2386 read_lock_bh(&idev->lock);
2387 im = idev->mc_list;
2388 if (im) {
2389 state->idev = idev;
2390 break;
2391 }
2392 read_unlock_bh(&idev->lock);
2393 }
2394 return im;
2395 }
2396
2397 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2398 {
2399 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2400
2401 im = im->next;
2402 while (!im) {
2403 if (likely(state->idev != NULL))
2404 read_unlock_bh(&state->idev->lock);
2405
2406 state->dev = next_net_device_rcu(state->dev);
2407 if (!state->dev) {
2408 state->idev = NULL;
2409 break;
2410 }
2411 state->idev = __in6_dev_get(state->dev);
2412 if (!state->idev)
2413 continue;
2414 read_lock_bh(&state->idev->lock);
2415 im = state->idev->mc_list;
2416 }
2417 return im;
2418 }
2419
2420 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2421 {
2422 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2423 if (im)
2424 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2425 --pos;
2426 return pos ? NULL : im;
2427 }
2428
2429 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2430 __acquires(RCU)
2431 {
2432 rcu_read_lock();
2433 return igmp6_mc_get_idx(seq, *pos);
2434 }
2435
2436 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2437 {
2438 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2439
2440 ++*pos;
2441 return im;
2442 }
2443
2444 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2445 __releases(RCU)
2446 {
2447 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2448
2449 if (likely(state->idev != NULL)) {
2450 read_unlock_bh(&state->idev->lock);
2451 state->idev = NULL;
2452 }
2453 state->dev = NULL;
2454 rcu_read_unlock();
2455 }
2456
2457 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2458 {
2459 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2460 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2461
2462 seq_printf(seq,
2463 "%-4d %-15s %pi6 %5d %08X %ld\n",
2464 state->dev->ifindex, state->dev->name,
2465 &im->mca_addr,
2466 im->mca_users, im->mca_flags,
2467 (im->mca_flags&MAF_TIMER_RUNNING) ?
2468 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2469 return 0;
2470 }
2471
2472 static const struct seq_operations igmp6_mc_seq_ops = {
2473 .start = igmp6_mc_seq_start,
2474 .next = igmp6_mc_seq_next,
2475 .stop = igmp6_mc_seq_stop,
2476 .show = igmp6_mc_seq_show,
2477 };
2478
2479 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2480 {
2481 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2482 sizeof(struct igmp6_mc_iter_state));
2483 }
2484
2485 static const struct file_operations igmp6_mc_seq_fops = {
2486 .owner = THIS_MODULE,
2487 .open = igmp6_mc_seq_open,
2488 .read = seq_read,
2489 .llseek = seq_lseek,
2490 .release = seq_release_net,
2491 };
2492
2493 struct igmp6_mcf_iter_state {
2494 struct seq_net_private p;
2495 struct net_device *dev;
2496 struct inet6_dev *idev;
2497 struct ifmcaddr6 *im;
2498 };
2499
2500 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2501
2502 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2503 {
2504 struct ip6_sf_list *psf = NULL;
2505 struct ifmcaddr6 *im = NULL;
2506 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2507 struct net *net = seq_file_net(seq);
2508
2509 state->idev = NULL;
2510 state->im = NULL;
2511 for_each_netdev_rcu(net, state->dev) {
2512 struct inet6_dev *idev;
2513 idev = __in6_dev_get(state->dev);
2514 if (unlikely(idev == NULL))
2515 continue;
2516 read_lock_bh(&idev->lock);
2517 im = idev->mc_list;
2518 if (likely(im != NULL)) {
2519 spin_lock_bh(&im->mca_lock);
2520 psf = im->mca_sources;
2521 if (likely(psf != NULL)) {
2522 state->im = im;
2523 state->idev = idev;
2524 break;
2525 }
2526 spin_unlock_bh(&im->mca_lock);
2527 }
2528 read_unlock_bh(&idev->lock);
2529 }
2530 return psf;
2531 }
2532
2533 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2534 {
2535 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2536
2537 psf = psf->sf_next;
2538 while (!psf) {
2539 spin_unlock_bh(&state->im->mca_lock);
2540 state->im = state->im->next;
2541 while (!state->im) {
2542 if (likely(state->idev != NULL))
2543 read_unlock_bh(&state->idev->lock);
2544
2545 state->dev = next_net_device_rcu(state->dev);
2546 if (!state->dev) {
2547 state->idev = NULL;
2548 goto out;
2549 }
2550 state->idev = __in6_dev_get(state->dev);
2551 if (!state->idev)
2552 continue;
2553 read_lock_bh(&state->idev->lock);
2554 state->im = state->idev->mc_list;
2555 }
2556 if (!state->im)
2557 break;
2558 spin_lock_bh(&state->im->mca_lock);
2559 psf = state->im->mca_sources;
2560 }
2561 out:
2562 return psf;
2563 }
2564
2565 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2566 {
2567 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2568 if (psf)
2569 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2570 --pos;
2571 return pos ? NULL : psf;
2572 }
2573
2574 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2575 __acquires(RCU)
2576 {
2577 rcu_read_lock();
2578 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2579 }
2580
2581 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2582 {
2583 struct ip6_sf_list *psf;
2584 if (v == SEQ_START_TOKEN)
2585 psf = igmp6_mcf_get_first(seq);
2586 else
2587 psf = igmp6_mcf_get_next(seq, v);
2588 ++*pos;
2589 return psf;
2590 }
2591
2592 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2593 __releases(RCU)
2594 {
2595 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2596 if (likely(state->im != NULL)) {
2597 spin_unlock_bh(&state->im->mca_lock);
2598 state->im = NULL;
2599 }
2600 if (likely(state->idev != NULL)) {
2601 read_unlock_bh(&state->idev->lock);
2602 state->idev = NULL;
2603 }
2604 state->dev = NULL;
2605 rcu_read_unlock();
2606 }
2607
2608 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2609 {
2610 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2611 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2612
2613 if (v == SEQ_START_TOKEN) {
2614 seq_printf(seq,
2615 "%3s %6s "
2616 "%32s %32s %6s %6s\n", "Idx",
2617 "Device", "Multicast Address",
2618 "Source Address", "INC", "EXC");
2619 } else {
2620 seq_printf(seq,
2621 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2622 state->dev->ifindex, state->dev->name,
2623 &state->im->mca_addr,
2624 &psf->sf_addr,
2625 psf->sf_count[MCAST_INCLUDE],
2626 psf->sf_count[MCAST_EXCLUDE]);
2627 }
2628 return 0;
2629 }
2630
2631 static const struct seq_operations igmp6_mcf_seq_ops = {
2632 .start = igmp6_mcf_seq_start,
2633 .next = igmp6_mcf_seq_next,
2634 .stop = igmp6_mcf_seq_stop,
2635 .show = igmp6_mcf_seq_show,
2636 };
2637
2638 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2639 {
2640 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2641 sizeof(struct igmp6_mcf_iter_state));
2642 }
2643
2644 static const struct file_operations igmp6_mcf_seq_fops = {
2645 .owner = THIS_MODULE,
2646 .open = igmp6_mcf_seq_open,
2647 .read = seq_read,
2648 .llseek = seq_lseek,
2649 .release = seq_release_net,
2650 };
2651
2652 static int __net_init igmp6_proc_init(struct net *net)
2653 {
2654 int err;
2655
2656 err = -ENOMEM;
2657 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2658 goto out;
2659 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2660 &igmp6_mcf_seq_fops))
2661 goto out_proc_net_igmp6;
2662
2663 err = 0;
2664 out:
2665 return err;
2666
2667 out_proc_net_igmp6:
2668 remove_proc_entry("igmp6", net->proc_net);
2669 goto out;
2670 }
2671
2672 static void __net_exit igmp6_proc_exit(struct net *net)
2673 {
2674 remove_proc_entry("mcfilter6", net->proc_net);
2675 remove_proc_entry("igmp6", net->proc_net);
2676 }
2677 #else
2678 static inline int igmp6_proc_init(struct net *net)
2679 {
2680 return 0;
2681 }
2682 static inline void igmp6_proc_exit(struct net *net)
2683 {
2684 }
2685 #endif
2686
2687 static int __net_init igmp6_net_init(struct net *net)
2688 {
2689 int err;
2690
2691 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2692 SOCK_RAW, IPPROTO_ICMPV6, net);
2693 if (err < 0) {
2694 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2695 err);
2696 goto out;
2697 }
2698
2699 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2700
2701 err = igmp6_proc_init(net);
2702 if (err)
2703 goto out_sock_create;
2704 out:
2705 return err;
2706
2707 out_sock_create:
2708 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2709 goto out;
2710 }
2711
2712 static void __net_exit igmp6_net_exit(struct net *net)
2713 {
2714 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2715 igmp6_proc_exit(net);
2716 }
2717
2718 static struct pernet_operations igmp6_net_ops = {
2719 .init = igmp6_net_init,
2720 .exit = igmp6_net_exit,
2721 };
2722
2723 int __init igmp6_init(void)
2724 {
2725 return register_pernet_subsys(&igmp6_net_ops);
2726 }
2727
2728 void igmp6_cleanup(void)
2729 {
2730 unregister_pernet_subsys(&igmp6_net_ops);
2731 }
CRIS linux kernel tree