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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Multicast support for IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
10 */
11
12/* Changes:
13 *
14 * yoshfuji : fix format of router-alert option
15 * YOSHIFUJI Hideaki @USAGI:
16 * Fixed source address for MLD message based on
17 * <draft-ietf-magma-mld-source-05.txt>.
18 * YOSHIFUJI Hideaki @USAGI:
19 * - Ignore Queries for invalid addresses.
20 * - MLD for link-local addresses.
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - MLDv2 support
23 */
24
25#include <linux/module.h>
26#include <linux/errno.h>
27#include <linux/types.h>
28#include <linux/string.h>
29#include <linux/socket.h>
30#include <linux/sockios.h>
31#include <linux/jiffies.h>
32#include <linux/net.h>
33#include <linux/in.h>
34#include <linux/in6.h>
35#include <linux/netdevice.h>
36#include <linux/if_arp.h>
37#include <linux/route.h>
38#include <linux/init.h>
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
41#include <linux/slab.h>
42#include <linux/pkt_sched.h>
43#include <net/mld.h>
44#include <linux/workqueue.h>
45
46#include <linux/netfilter.h>
47#include <linux/netfilter_ipv6.h>
48
49#include <net/net_namespace.h>
50#include <net/sock.h>
51#include <net/snmp.h>
52
53#include <net/ipv6.h>
54#include <net/protocol.h>
55#include <net/if_inet6.h>
56#include <net/ndisc.h>
57#include <net/addrconf.h>
58#include <net/ip6_route.h>
59#include <net/inet_common.h>
60
61#include <net/ip6_checksum.h>
62
63/* Ensure that we have struct in6_addr aligned on 32bit word. */
64static int __mld2_query_bugs[] __attribute__((__unused__)) = {
65 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
66 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
67 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
68};
69
70static struct workqueue_struct *mld_wq;
71static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
72
73static void igmp6_join_group(struct ifmcaddr6 *ma);
74static void igmp6_leave_group(struct ifmcaddr6 *ma);
75static void mld_mca_work(struct work_struct *work);
76
77static void mld_ifc_event(struct inet6_dev *idev);
78static bool mld_in_v1_mode(const struct inet6_dev *idev);
79static int sf_setstate(struct ifmcaddr6 *pmc);
80static void sf_markstate(struct ifmcaddr6 *pmc);
81static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
82static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
83 int sfmode, int sfcount, const struct in6_addr *psfsrc,
84 int delta);
85static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
86 int sfmode, int sfcount, const struct in6_addr *psfsrc,
87 int delta);
88static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
89 struct inet6_dev *idev);
90static int __ipv6_dev_mc_inc(struct net_device *dev,
91 const struct in6_addr *addr, unsigned int mode);
92
93#define MLD_QRV_DEFAULT 2
94/* RFC3810, 9.2. Query Interval */
95#define MLD_QI_DEFAULT (125 * HZ)
96/* RFC3810, 9.3. Query Response Interval */
97#define MLD_QRI_DEFAULT (10 * HZ)
98
99/* RFC3810, 8.1 Query Version Distinctions */
100#define MLD_V1_QUERY_LEN 24
101#define MLD_V2_QUERY_LEN_MIN 28
102
103#define IPV6_MLD_MAX_MSF 64
104
105int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
106int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
107
108/*
109 * socket join on multicast group
110 */
111#define mc_dereference(e, idev) \
112 rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock))
113
114#define sock_dereference(e, sk) \
115 rcu_dereference_protected(e, lockdep_sock_is_held(sk))
116
117#define for_each_pmc_socklock(np, sk, pmc) \
118 for (pmc = sock_dereference((np)->ipv6_mc_list, sk); \
119 pmc; \
120 pmc = sock_dereference(pmc->next, sk))
121
122#define for_each_pmc_rcu(np, pmc) \
123 for (pmc = rcu_dereference((np)->ipv6_mc_list); \
124 pmc; \
125 pmc = rcu_dereference(pmc->next))
126
127#define for_each_psf_mclock(mc, psf) \
128 for (psf = mc_dereference((mc)->mca_sources, mc->idev); \
129 psf; \
130 psf = mc_dereference(psf->sf_next, mc->idev))
131
132#define for_each_psf_rcu(mc, psf) \
133 for (psf = rcu_dereference((mc)->mca_sources); \
134 psf; \
135 psf = rcu_dereference(psf->sf_next))
136
137#define for_each_psf_tomb(mc, psf) \
138 for (psf = mc_dereference((mc)->mca_tomb, mc->idev); \
139 psf; \
140 psf = mc_dereference(psf->sf_next, mc->idev))
141
142#define for_each_mc_mclock(idev, mc) \
143 for (mc = mc_dereference((idev)->mc_list, idev); \
144 mc; \
145 mc = mc_dereference(mc->next, idev))
146
147#define for_each_mc_rcu(idev, mc) \
148 for (mc = rcu_dereference((idev)->mc_list); \
149 mc; \
150 mc = rcu_dereference(mc->next))
151
152#define for_each_mc_tomb(idev, mc) \
153 for (mc = mc_dereference((idev)->mc_tomb, idev); \
154 mc; \
155 mc = mc_dereference(mc->next, idev))
156
157static int unsolicited_report_interval(struct inet6_dev *idev)
158{
159 int iv;
160
161 if (mld_in_v1_mode(idev))
162 iv = idev->cnf.mldv1_unsolicited_report_interval;
163 else
164 iv = idev->cnf.mldv2_unsolicited_report_interval;
165
166 return iv > 0 ? iv : 1;
167}
168
169static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
170 const struct in6_addr *addr, unsigned int mode)
171{
172 struct net_device *dev = NULL;
173 struct ipv6_mc_socklist *mc_lst;
174 struct ipv6_pinfo *np = inet6_sk(sk);
175 struct net *net = sock_net(sk);
176 int err;
177
178 ASSERT_RTNL();
179
180 if (!ipv6_addr_is_multicast(addr))
181 return -EINVAL;
182
183 for_each_pmc_socklock(np, sk, mc_lst) {
184 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
185 ipv6_addr_equal(&mc_lst->addr, addr))
186 return -EADDRINUSE;
187 }
188
189 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
190
191 if (!mc_lst)
192 return -ENOMEM;
193
194 mc_lst->next = NULL;
195 mc_lst->addr = *addr;
196
197 if (ifindex == 0) {
198 struct rt6_info *rt;
199 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
200 if (rt) {
201 dev = rt->dst.dev;
202 ip6_rt_put(rt);
203 }
204 } else
205 dev = __dev_get_by_index(net, ifindex);
206
207 if (!dev) {
208 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
209 return -ENODEV;
210 }
211
212 mc_lst->ifindex = dev->ifindex;
213 mc_lst->sfmode = mode;
214 RCU_INIT_POINTER(mc_lst->sflist, NULL);
215
216 /*
217 * now add/increase the group membership on the device
218 */
219
220 err = __ipv6_dev_mc_inc(dev, addr, mode);
221
222 if (err) {
223 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
224 return err;
225 }
226
227 mc_lst->next = np->ipv6_mc_list;
228 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
229
230 return 0;
231}
232
233int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
234{
235 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
236}
237EXPORT_SYMBOL(ipv6_sock_mc_join);
238
239int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
240 const struct in6_addr *addr, unsigned int mode)
241{
242 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
243}
244
245/*
246 * socket leave on multicast group
247 */
248int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
249{
250 struct ipv6_pinfo *np = inet6_sk(sk);
251 struct ipv6_mc_socklist *mc_lst;
252 struct ipv6_mc_socklist __rcu **lnk;
253 struct net *net = sock_net(sk);
254
255 ASSERT_RTNL();
256
257 if (!ipv6_addr_is_multicast(addr))
258 return -EINVAL;
259
260 for (lnk = &np->ipv6_mc_list;
261 (mc_lst = sock_dereference(*lnk, sk)) != NULL;
262 lnk = &mc_lst->next) {
263 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
264 ipv6_addr_equal(&mc_lst->addr, addr)) {
265 struct net_device *dev;
266
267 *lnk = mc_lst->next;
268
269 dev = __dev_get_by_index(net, mc_lst->ifindex);
270 if (dev) {
271 struct inet6_dev *idev = __in6_dev_get(dev);
272
273 ip6_mc_leave_src(sk, mc_lst, idev);
274 if (idev)
275 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
276 } else {
277 ip6_mc_leave_src(sk, mc_lst, NULL);
278 }
279
280 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
281 kfree_rcu(mc_lst, rcu);
282 return 0;
283 }
284 }
285
286 return -EADDRNOTAVAIL;
287}
288EXPORT_SYMBOL(ipv6_sock_mc_drop);
289
290static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net,
291 const struct in6_addr *group,
292 int ifindex)
293{
294 struct net_device *dev = NULL;
295 struct inet6_dev *idev = NULL;
296
297 if (ifindex == 0) {
298 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
299
300 if (rt) {
301 dev = rt->dst.dev;
302 ip6_rt_put(rt);
303 }
304 } else {
305 dev = __dev_get_by_index(net, ifindex);
306 }
307
308 if (!dev)
309 return NULL;
310 idev = __in6_dev_get(dev);
311 if (!idev)
312 return NULL;
313 if (idev->dead)
314 return NULL;
315 return idev;
316}
317
318void __ipv6_sock_mc_close(struct sock *sk)
319{
320 struct ipv6_pinfo *np = inet6_sk(sk);
321 struct ipv6_mc_socklist *mc_lst;
322 struct net *net = sock_net(sk);
323
324 ASSERT_RTNL();
325
326 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) {
327 struct net_device *dev;
328
329 np->ipv6_mc_list = mc_lst->next;
330
331 dev = __dev_get_by_index(net, mc_lst->ifindex);
332 if (dev) {
333 struct inet6_dev *idev = __in6_dev_get(dev);
334
335 ip6_mc_leave_src(sk, mc_lst, idev);
336 if (idev)
337 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
338 } else {
339 ip6_mc_leave_src(sk, mc_lst, NULL);
340 }
341
342 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
343 kfree_rcu(mc_lst, rcu);
344 }
345}
346
347void ipv6_sock_mc_close(struct sock *sk)
348{
349 struct ipv6_pinfo *np = inet6_sk(sk);
350
351 if (!rcu_access_pointer(np->ipv6_mc_list))
352 return;
353
354 rtnl_lock();
355 lock_sock(sk);
356 __ipv6_sock_mc_close(sk);
357 release_sock(sk);
358 rtnl_unlock();
359}
360
361int ip6_mc_source(int add, int omode, struct sock *sk,
362 struct group_source_req *pgsr)
363{
364 struct in6_addr *source, *group;
365 struct ipv6_mc_socklist *pmc;
366 struct inet6_dev *idev;
367 struct ipv6_pinfo *inet6 = inet6_sk(sk);
368 struct ip6_sf_socklist *psl;
369 struct net *net = sock_net(sk);
370 int i, j, rv;
371 int leavegroup = 0;
372 int err;
373
374 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
375 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
376
377 if (!ipv6_addr_is_multicast(group))
378 return -EINVAL;
379
380 idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface);
381 if (!idev)
382 return -ENODEV;
383
384 err = -EADDRNOTAVAIL;
385
386 mutex_lock(&idev->mc_lock);
387 for_each_pmc_socklock(inet6, sk, pmc) {
388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
389 continue;
390 if (ipv6_addr_equal(&pmc->addr, group))
391 break;
392 }
393 if (!pmc) { /* must have a prior join */
394 err = -EINVAL;
395 goto done;
396 }
397 /* if a source filter was set, must be the same mode as before */
398 if (rcu_access_pointer(pmc->sflist)) {
399 if (pmc->sfmode != omode) {
400 err = -EINVAL;
401 goto done;
402 }
403 } else if (pmc->sfmode != omode) {
404 /* allow mode switches for empty-set filters */
405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
407 pmc->sfmode = omode;
408 }
409
410 psl = sock_dereference(pmc->sflist, sk);
411 if (!add) {
412 if (!psl)
413 goto done; /* err = -EADDRNOTAVAIL */
414 rv = !0;
415 for (i = 0; i < psl->sl_count; i++) {
416 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
417 if (rv == 0)
418 break;
419 }
420 if (rv) /* source not found */
421 goto done; /* err = -EADDRNOTAVAIL */
422
423 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
424 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
425 leavegroup = 1;
426 goto done;
427 }
428
429 /* update the interface filter */
430 ip6_mc_del_src(idev, group, omode, 1, source, 1);
431
432 for (j = i+1; j < psl->sl_count; j++)
433 psl->sl_addr[j-1] = psl->sl_addr[j];
434 psl->sl_count--;
435 err = 0;
436 goto done;
437 }
438 /* else, add a new source to the filter */
439
440 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
441 err = -ENOBUFS;
442 goto done;
443 }
444 if (!psl || psl->sl_count == psl->sl_max) {
445 struct ip6_sf_socklist *newpsl;
446 int count = IP6_SFBLOCK;
447
448 if (psl)
449 count += psl->sl_max;
450 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count),
451 GFP_KERNEL);
452 if (!newpsl) {
453 err = -ENOBUFS;
454 goto done;
455 }
456 newpsl->sl_max = count;
457 newpsl->sl_count = count - IP6_SFBLOCK;
458 if (psl) {
459 for (i = 0; i < psl->sl_count; i++)
460 newpsl->sl_addr[i] = psl->sl_addr[i];
461 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
462 &sk->sk_omem_alloc);
463 }
464 rcu_assign_pointer(pmc->sflist, newpsl);
465 kfree_rcu(psl, rcu);
466 psl = newpsl;
467 }
468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
469 for (i = 0; i < psl->sl_count; i++) {
470 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
471 if (rv == 0) /* There is an error in the address. */
472 goto done;
473 }
474 for (j = psl->sl_count-1; j >= i; j--)
475 psl->sl_addr[j+1] = psl->sl_addr[j];
476 psl->sl_addr[i] = *source;
477 psl->sl_count++;
478 err = 0;
479 /* update the interface list */
480 ip6_mc_add_src(idev, group, omode, 1, source, 1);
481done:
482 mutex_unlock(&idev->mc_lock);
483 if (leavegroup)
484 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
485 return err;
486}
487
488int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
489 struct sockaddr_storage *list)
490{
491 const struct in6_addr *group;
492 struct ipv6_mc_socklist *pmc;
493 struct inet6_dev *idev;
494 struct ipv6_pinfo *inet6 = inet6_sk(sk);
495 struct ip6_sf_socklist *newpsl, *psl;
496 struct net *net = sock_net(sk);
497 int leavegroup = 0;
498 int i, err;
499
500 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
501
502 if (!ipv6_addr_is_multicast(group))
503 return -EINVAL;
504 if (gsf->gf_fmode != MCAST_INCLUDE &&
505 gsf->gf_fmode != MCAST_EXCLUDE)
506 return -EINVAL;
507
508 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface);
509 if (!idev)
510 return -ENODEV;
511
512 err = 0;
513
514 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
515 leavegroup = 1;
516 goto done;
517 }
518
519 for_each_pmc_socklock(inet6, sk, pmc) {
520 if (pmc->ifindex != gsf->gf_interface)
521 continue;
522 if (ipv6_addr_equal(&pmc->addr, group))
523 break;
524 }
525 if (!pmc) { /* must have a prior join */
526 err = -EINVAL;
527 goto done;
528 }
529 if (gsf->gf_numsrc) {
530 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr,
531 gsf->gf_numsrc),
532 GFP_KERNEL);
533 if (!newpsl) {
534 err = -ENOBUFS;
535 goto done;
536 }
537 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
538 for (i = 0; i < newpsl->sl_count; ++i, ++list) {
539 struct sockaddr_in6 *psin6;
540
541 psin6 = (struct sockaddr_in6 *)list;
542 newpsl->sl_addr[i] = psin6->sin6_addr;
543 }
544 mutex_lock(&idev->mc_lock);
545 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
546 newpsl->sl_count, newpsl->sl_addr, 0);
547 if (err) {
548 mutex_unlock(&idev->mc_lock);
549 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr,
550 newpsl->sl_max));
551 goto done;
552 }
553 mutex_unlock(&idev->mc_lock);
554 } else {
555 newpsl = NULL;
556 mutex_lock(&idev->mc_lock);
557 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
558 mutex_unlock(&idev->mc_lock);
559 }
560
561 mutex_lock(&idev->mc_lock);
562 psl = sock_dereference(pmc->sflist, sk);
563 if (psl) {
564 ip6_mc_del_src(idev, group, pmc->sfmode,
565 psl->sl_count, psl->sl_addr, 0);
566 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
567 &sk->sk_omem_alloc);
568 } else {
569 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
570 }
571 rcu_assign_pointer(pmc->sflist, newpsl);
572 mutex_unlock(&idev->mc_lock);
573 kfree_rcu(psl, rcu);
574 pmc->sfmode = gsf->gf_fmode;
575 err = 0;
576done:
577 if (leavegroup)
578 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
579 return err;
580}
581
582int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
583 sockptr_t optval, size_t ss_offset)
584{
585 struct ipv6_pinfo *inet6 = inet6_sk(sk);
586 const struct in6_addr *group;
587 struct ipv6_mc_socklist *pmc;
588 struct ip6_sf_socklist *psl;
589 int i, count, copycount;
590
591 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
592
593 if (!ipv6_addr_is_multicast(group))
594 return -EINVAL;
595
596 /* changes to the ipv6_mc_list require the socket lock and
597 * rtnl lock. We have the socket lock, so reading the list is safe.
598 */
599
600 for_each_pmc_socklock(inet6, sk, pmc) {
601 if (pmc->ifindex != gsf->gf_interface)
602 continue;
603 if (ipv6_addr_equal(group, &pmc->addr))
604 break;
605 }
606 if (!pmc) /* must have a prior join */
607 return -EADDRNOTAVAIL;
608
609 gsf->gf_fmode = pmc->sfmode;
610 psl = sock_dereference(pmc->sflist, sk);
611 count = psl ? psl->sl_count : 0;
612
613 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
614 gsf->gf_numsrc = count;
615 for (i = 0; i < copycount; i++) {
616 struct sockaddr_in6 *psin6;
617 struct sockaddr_storage ss;
618
619 psin6 = (struct sockaddr_in6 *)&ss;
620 memset(&ss, 0, sizeof(ss));
621 psin6->sin6_family = AF_INET6;
622 psin6->sin6_addr = psl->sl_addr[i];
623 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss)))
624 return -EFAULT;
625 ss_offset += sizeof(ss);
626 }
627 return 0;
628}
629
630bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr,
631 const struct in6_addr *src_addr)
632{
633 const struct ipv6_pinfo *np = inet6_sk(sk);
634 const struct ipv6_mc_socklist *mc;
635 const struct ip6_sf_socklist *psl;
636 bool rv = true;
637
638 rcu_read_lock();
639 for_each_pmc_rcu(np, mc) {
640 if (ipv6_addr_equal(&mc->addr, mc_addr))
641 break;
642 }
643 if (!mc) {
644 rcu_read_unlock();
645 return inet6_test_bit(MC6_ALL, sk);
646 }
647 psl = rcu_dereference(mc->sflist);
648 if (!psl) {
649 rv = mc->sfmode == MCAST_EXCLUDE;
650 } else {
651 int i;
652
653 for (i = 0; i < psl->sl_count; i++) {
654 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
655 break;
656 }
657 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
658 rv = false;
659 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
660 rv = false;
661 }
662 rcu_read_unlock();
663
664 return rv;
665}
666
667/* called with mc_lock */
668static void igmp6_group_added(struct ifmcaddr6 *mc)
669{
670 struct net_device *dev = mc->idev->dev;
671 char buf[MAX_ADDR_LEN];
672
673 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
674 IPV6_ADDR_SCOPE_LINKLOCAL)
675 return;
676
677 if (!(mc->mca_flags&MAF_LOADED)) {
678 mc->mca_flags |= MAF_LOADED;
679 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
680 dev_mc_add(dev, buf);
681 }
682
683 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
684 return;
685
686 if (mld_in_v1_mode(mc->idev)) {
687 igmp6_join_group(mc);
688 return;
689 }
690 /* else v2 */
691
692 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
693 * should not send filter-mode change record as the mode
694 * should be from IN() to IN(A).
695 */
696 if (mc->mca_sfmode == MCAST_EXCLUDE)
697 mc->mca_crcount = mc->idev->mc_qrv;
698
699 mld_ifc_event(mc->idev);
700}
701
702/* called with mc_lock */
703static void igmp6_group_dropped(struct ifmcaddr6 *mc)
704{
705 struct net_device *dev = mc->idev->dev;
706 char buf[MAX_ADDR_LEN];
707
708 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
709 IPV6_ADDR_SCOPE_LINKLOCAL)
710 return;
711
712 if (mc->mca_flags&MAF_LOADED) {
713 mc->mca_flags &= ~MAF_LOADED;
714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
715 dev_mc_del(dev, buf);
716 }
717
718 if (mc->mca_flags & MAF_NOREPORT)
719 return;
720
721 if (!mc->idev->dead)
722 igmp6_leave_group(mc);
723
724 if (cancel_delayed_work(&mc->mca_work))
725 refcount_dec(&mc->mca_refcnt);
726}
727
728/*
729 * deleted ifmcaddr6 manipulation
730 * called with mc_lock
731 */
732static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
733{
734 struct ifmcaddr6 *pmc;
735
736 /* this is an "ifmcaddr6" for convenience; only the fields below
737 * are actually used. In particular, the refcnt and users are not
738 * used for management of the delete list. Using the same structure
739 * for deleted items allows change reports to use common code with
740 * non-deleted or query-response MCA's.
741 */
742 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
743 if (!pmc)
744 return;
745
746 pmc->idev = im->idev;
747 in6_dev_hold(idev);
748 pmc->mca_addr = im->mca_addr;
749 pmc->mca_crcount = idev->mc_qrv;
750 pmc->mca_sfmode = im->mca_sfmode;
751 if (pmc->mca_sfmode == MCAST_INCLUDE) {
752 struct ip6_sf_list *psf;
753
754 rcu_assign_pointer(pmc->mca_tomb,
755 mc_dereference(im->mca_tomb, idev));
756 rcu_assign_pointer(pmc->mca_sources,
757 mc_dereference(im->mca_sources, idev));
758 RCU_INIT_POINTER(im->mca_tomb, NULL);
759 RCU_INIT_POINTER(im->mca_sources, NULL);
760
761 for_each_psf_mclock(pmc, psf)
762 psf->sf_crcount = pmc->mca_crcount;
763 }
764
765 rcu_assign_pointer(pmc->next, idev->mc_tomb);
766 rcu_assign_pointer(idev->mc_tomb, pmc);
767}
768
769/* called with mc_lock */
770static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
771{
772 struct ip6_sf_list *psf, *sources, *tomb;
773 struct in6_addr *pmca = &im->mca_addr;
774 struct ifmcaddr6 *pmc, *pmc_prev;
775
776 pmc_prev = NULL;
777 for_each_mc_tomb(idev, pmc) {
778 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
779 break;
780 pmc_prev = pmc;
781 }
782 if (pmc) {
783 if (pmc_prev)
784 rcu_assign_pointer(pmc_prev->next, pmc->next);
785 else
786 rcu_assign_pointer(idev->mc_tomb, pmc->next);
787 }
788
789 if (pmc) {
790 im->idev = pmc->idev;
791 if (im->mca_sfmode == MCAST_INCLUDE) {
792 tomb = rcu_replace_pointer(im->mca_tomb,
793 mc_dereference(pmc->mca_tomb, pmc->idev),
794 lockdep_is_held(&im->idev->mc_lock));
795 rcu_assign_pointer(pmc->mca_tomb, tomb);
796
797 sources = rcu_replace_pointer(im->mca_sources,
798 mc_dereference(pmc->mca_sources, pmc->idev),
799 lockdep_is_held(&im->idev->mc_lock));
800 rcu_assign_pointer(pmc->mca_sources, sources);
801 for_each_psf_mclock(im, psf)
802 psf->sf_crcount = idev->mc_qrv;
803 } else {
804 im->mca_crcount = idev->mc_qrv;
805 }
806 in6_dev_put(pmc->idev);
807 ip6_mc_clear_src(pmc);
808 kfree_rcu(pmc, rcu);
809 }
810}
811
812/* called with mc_lock */
813static void mld_clear_delrec(struct inet6_dev *idev)
814{
815 struct ifmcaddr6 *pmc, *nextpmc;
816
817 pmc = mc_dereference(idev->mc_tomb, idev);
818 RCU_INIT_POINTER(idev->mc_tomb, NULL);
819
820 for (; pmc; pmc = nextpmc) {
821 nextpmc = mc_dereference(pmc->next, idev);
822 ip6_mc_clear_src(pmc);
823 in6_dev_put(pmc->idev);
824 kfree_rcu(pmc, rcu);
825 }
826
827 /* clear dead sources, too */
828 for_each_mc_mclock(idev, pmc) {
829 struct ip6_sf_list *psf, *psf_next;
830
831 psf = mc_dereference(pmc->mca_tomb, idev);
832 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
833 for (; psf; psf = psf_next) {
834 psf_next = mc_dereference(psf->sf_next, idev);
835 kfree_rcu(psf, rcu);
836 }
837 }
838}
839
840static void mld_clear_query(struct inet6_dev *idev)
841{
842 struct sk_buff *skb;
843
844 spin_lock_bh(&idev->mc_query_lock);
845 while ((skb = __skb_dequeue(&idev->mc_query_queue)))
846 kfree_skb(skb);
847 spin_unlock_bh(&idev->mc_query_lock);
848}
849
850static void mld_clear_report(struct inet6_dev *idev)
851{
852 struct sk_buff *skb;
853
854 spin_lock_bh(&idev->mc_report_lock);
855 while ((skb = __skb_dequeue(&idev->mc_report_queue)))
856 kfree_skb(skb);
857 spin_unlock_bh(&idev->mc_report_lock);
858}
859
860static void mca_get(struct ifmcaddr6 *mc)
861{
862 refcount_inc(&mc->mca_refcnt);
863}
864
865static void ma_put(struct ifmcaddr6 *mc)
866{
867 if (refcount_dec_and_test(&mc->mca_refcnt)) {
868 in6_dev_put(mc->idev);
869 kfree_rcu(mc, rcu);
870 }
871}
872
873/* called with mc_lock */
874static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
875 const struct in6_addr *addr,
876 unsigned int mode)
877{
878 struct ifmcaddr6 *mc;
879
880 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
881 if (!mc)
882 return NULL;
883
884 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work);
885
886 mc->mca_addr = *addr;
887 mc->idev = idev; /* reference taken by caller */
888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 refcount_set(&mc->mca_refcnt, 1);
892
893 mc->mca_sfmode = mode;
894 mc->mca_sfcount[mode] = 1;
895
896 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
897 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
898 mc->mca_flags |= MAF_NOREPORT;
899
900 return mc;
901}
902
903/*
904 * device multicast group inc (add if not found)
905 */
906static int __ipv6_dev_mc_inc(struct net_device *dev,
907 const struct in6_addr *addr, unsigned int mode)
908{
909 struct ifmcaddr6 *mc;
910 struct inet6_dev *idev;
911
912 ASSERT_RTNL();
913
914 /* we need to take a reference on idev */
915 idev = in6_dev_get(dev);
916
917 if (!idev)
918 return -EINVAL;
919
920 if (idev->dead) {
921 in6_dev_put(idev);
922 return -ENODEV;
923 }
924
925 mutex_lock(&idev->mc_lock);
926 for_each_mc_mclock(idev, mc) {
927 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
928 mc->mca_users++;
929 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
930 mutex_unlock(&idev->mc_lock);
931 in6_dev_put(idev);
932 return 0;
933 }
934 }
935
936 mc = mca_alloc(idev, addr, mode);
937 if (!mc) {
938 mutex_unlock(&idev->mc_lock);
939 in6_dev_put(idev);
940 return -ENOMEM;
941 }
942
943 rcu_assign_pointer(mc->next, idev->mc_list);
944 rcu_assign_pointer(idev->mc_list, mc);
945
946 mca_get(mc);
947
948 mld_del_delrec(idev, mc);
949 igmp6_group_added(mc);
950 mutex_unlock(&idev->mc_lock);
951 ma_put(mc);
952 return 0;
953}
954
955int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
956{
957 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
958}
959EXPORT_SYMBOL(ipv6_dev_mc_inc);
960
961/*
962 * device multicast group del
963 */
964int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
965{
966 struct ifmcaddr6 *ma, __rcu **map;
967
968 ASSERT_RTNL();
969
970 mutex_lock(&idev->mc_lock);
971 for (map = &idev->mc_list;
972 (ma = mc_dereference(*map, idev));
973 map = &ma->next) {
974 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
975 if (--ma->mca_users == 0) {
976 *map = ma->next;
977
978 igmp6_group_dropped(ma);
979 ip6_mc_clear_src(ma);
980 mutex_unlock(&idev->mc_lock);
981
982 ma_put(ma);
983 return 0;
984 }
985 mutex_unlock(&idev->mc_lock);
986 return 0;
987 }
988 }
989
990 mutex_unlock(&idev->mc_lock);
991 return -ENOENT;
992}
993
994int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
995{
996 struct inet6_dev *idev;
997 int err;
998
999 ASSERT_RTNL();
1000
1001 idev = __in6_dev_get(dev);
1002 if (!idev)
1003 err = -ENODEV;
1004 else
1005 err = __ipv6_dev_mc_dec(idev, addr);
1006
1007 return err;
1008}
1009EXPORT_SYMBOL(ipv6_dev_mc_dec);
1010
1011/*
1012 * check if the interface/address pair is valid
1013 */
1014bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1015 const struct in6_addr *src_addr)
1016{
1017 struct inet6_dev *idev;
1018 struct ifmcaddr6 *mc;
1019 bool rv = false;
1020
1021 rcu_read_lock();
1022 idev = __in6_dev_get(dev);
1023 if (idev) {
1024 for_each_mc_rcu(idev, mc) {
1025 if (ipv6_addr_equal(&mc->mca_addr, group))
1026 break;
1027 }
1028 if (mc) {
1029 if (src_addr && !ipv6_addr_any(src_addr)) {
1030 struct ip6_sf_list *psf;
1031
1032 for_each_psf_rcu(mc, psf) {
1033 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1034 break;
1035 }
1036 if (psf)
1037 rv = psf->sf_count[MCAST_INCLUDE] ||
1038 psf->sf_count[MCAST_EXCLUDE] !=
1039 mc->mca_sfcount[MCAST_EXCLUDE];
1040 else
1041 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1042 } else
1043 rv = true; /* don't filter unspecified source */
1044 }
1045 }
1046 rcu_read_unlock();
1047 return rv;
1048}
1049
1050/* called with mc_lock */
1051static void mld_gq_start_work(struct inet6_dev *idev)
1052{
1053 unsigned long tv = get_random_u32_below(idev->mc_maxdelay);
1054
1055 idev->mc_gq_running = 1;
1056 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
1057 in6_dev_hold(idev);
1058}
1059
1060/* called with mc_lock */
1061static void mld_gq_stop_work(struct inet6_dev *idev)
1062{
1063 idev->mc_gq_running = 0;
1064 if (cancel_delayed_work(&idev->mc_gq_work))
1065 __in6_dev_put(idev);
1066}
1067
1068/* called with mc_lock */
1069static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
1070{
1071 unsigned long tv = get_random_u32_below(delay);
1072
1073 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
1074 in6_dev_hold(idev);
1075}
1076
1077/* called with mc_lock */
1078static void mld_ifc_stop_work(struct inet6_dev *idev)
1079{
1080 idev->mc_ifc_count = 0;
1081 if (cancel_delayed_work(&idev->mc_ifc_work))
1082 __in6_dev_put(idev);
1083}
1084
1085/* called with mc_lock */
1086static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
1087{
1088 unsigned long tv = get_random_u32_below(delay);
1089
1090 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
1091 in6_dev_hold(idev);
1092}
1093
1094static void mld_dad_stop_work(struct inet6_dev *idev)
1095{
1096 if (cancel_delayed_work(&idev->mc_dad_work))
1097 __in6_dev_put(idev);
1098}
1099
1100static void mld_query_stop_work(struct inet6_dev *idev)
1101{
1102 spin_lock_bh(&idev->mc_query_lock);
1103 if (cancel_delayed_work(&idev->mc_query_work))
1104 __in6_dev_put(idev);
1105 spin_unlock_bh(&idev->mc_query_lock);
1106}
1107
1108static void mld_report_stop_work(struct inet6_dev *idev)
1109{
1110 if (cancel_delayed_work_sync(&idev->mc_report_work))
1111 __in6_dev_put(idev);
1112}
1113
1114/*
1115 * IGMP handling (alias multicast ICMPv6 messages)
1116 * called with mc_lock
1117 */
1118static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1119{
1120 unsigned long delay = resptime;
1121
1122 /* Do not start work for these addresses */
1123 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1124 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1125 return;
1126
1127 if (cancel_delayed_work(&ma->mca_work)) {
1128 refcount_dec(&ma->mca_refcnt);
1129 delay = ma->mca_work.timer.expires - jiffies;
1130 }
1131
1132 if (delay >= resptime)
1133 delay = get_random_u32_below(resptime);
1134
1135 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
1136 refcount_inc(&ma->mca_refcnt);
1137 ma->mca_flags |= MAF_TIMER_RUNNING;
1138}
1139
1140/* mark EXCLUDE-mode sources
1141 * called with mc_lock
1142 */
1143static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1144 const struct in6_addr *srcs)
1145{
1146 struct ip6_sf_list *psf;
1147 int i, scount;
1148
1149 scount = 0;
1150 for_each_psf_mclock(pmc, psf) {
1151 if (scount == nsrcs)
1152 break;
1153 for (i = 0; i < nsrcs; i++) {
1154 /* skip inactive filters */
1155 if (psf->sf_count[MCAST_INCLUDE] ||
1156 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1157 psf->sf_count[MCAST_EXCLUDE])
1158 break;
1159 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1160 scount++;
1161 break;
1162 }
1163 }
1164 }
1165 pmc->mca_flags &= ~MAF_GSQUERY;
1166 if (scount == nsrcs) /* all sources excluded */
1167 return false;
1168 return true;
1169}
1170
1171/* called with mc_lock */
1172static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1173 const struct in6_addr *srcs)
1174{
1175 struct ip6_sf_list *psf;
1176 int i, scount;
1177
1178 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1179 return mld_xmarksources(pmc, nsrcs, srcs);
1180
1181 /* mark INCLUDE-mode sources */
1182
1183 scount = 0;
1184 for_each_psf_mclock(pmc, psf) {
1185 if (scount == nsrcs)
1186 break;
1187 for (i = 0; i < nsrcs; i++) {
1188 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1189 psf->sf_gsresp = 1;
1190 scount++;
1191 break;
1192 }
1193 }
1194 }
1195 if (!scount) {
1196 pmc->mca_flags &= ~MAF_GSQUERY;
1197 return false;
1198 }
1199 pmc->mca_flags |= MAF_GSQUERY;
1200 return true;
1201}
1202
1203static int mld_force_mld_version(const struct inet6_dev *idev)
1204{
1205 /* Normally, both are 0 here. If enforcement to a particular is
1206 * being used, individual device enforcement will have a lower
1207 * precedence over 'all' device (.../conf/all/force_mld_version).
1208 */
1209
1210 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1211 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1212 else
1213 return idev->cnf.force_mld_version;
1214}
1215
1216static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1217{
1218 return mld_force_mld_version(idev) == 2;
1219}
1220
1221static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1222{
1223 return mld_force_mld_version(idev) == 1;
1224}
1225
1226static bool mld_in_v1_mode(const struct inet6_dev *idev)
1227{
1228 if (mld_in_v2_mode_only(idev))
1229 return false;
1230 if (mld_in_v1_mode_only(idev))
1231 return true;
1232 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1233 return true;
1234
1235 return false;
1236}
1237
1238static void mld_set_v1_mode(struct inet6_dev *idev)
1239{
1240 /* RFC3810, relevant sections:
1241 * - 9.1. Robustness Variable
1242 * - 9.2. Query Interval
1243 * - 9.3. Query Response Interval
1244 * - 9.12. Older Version Querier Present Timeout
1245 */
1246 unsigned long switchback;
1247
1248 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1249
1250 idev->mc_v1_seen = jiffies + switchback;
1251}
1252
1253static void mld_update_qrv(struct inet6_dev *idev,
1254 const struct mld2_query *mlh2)
1255{
1256 /* RFC3810, relevant sections:
1257 * - 5.1.8. QRV (Querier's Robustness Variable)
1258 * - 9.1. Robustness Variable
1259 */
1260
1261 /* The value of the Robustness Variable MUST NOT be zero,
1262 * and SHOULD NOT be one. Catch this here if we ever run
1263 * into such a case in future.
1264 */
1265 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1266 WARN_ON(idev->mc_qrv == 0);
1267
1268 if (mlh2->mld2q_qrv > 0)
1269 idev->mc_qrv = mlh2->mld2q_qrv;
1270
1271 if (unlikely(idev->mc_qrv < min_qrv)) {
1272 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1273 idev->mc_qrv, min_qrv);
1274 idev->mc_qrv = min_qrv;
1275 }
1276}
1277
1278static void mld_update_qi(struct inet6_dev *idev,
1279 const struct mld2_query *mlh2)
1280{
1281 /* RFC3810, relevant sections:
1282 * - 5.1.9. QQIC (Querier's Query Interval Code)
1283 * - 9.2. Query Interval
1284 * - 9.12. Older Version Querier Present Timeout
1285 * (the [Query Interval] in the last Query received)
1286 */
1287 unsigned long mc_qqi;
1288
1289 if (mlh2->mld2q_qqic < 128) {
1290 mc_qqi = mlh2->mld2q_qqic;
1291 } else {
1292 unsigned long mc_man, mc_exp;
1293
1294 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1295 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1296
1297 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1298 }
1299
1300 idev->mc_qi = mc_qqi * HZ;
1301}
1302
1303static void mld_update_qri(struct inet6_dev *idev,
1304 const struct mld2_query *mlh2)
1305{
1306 /* RFC3810, relevant sections:
1307 * - 5.1.3. Maximum Response Code
1308 * - 9.3. Query Response Interval
1309 */
1310 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1311}
1312
1313static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1314 unsigned long *max_delay, bool v1_query)
1315{
1316 unsigned long mldv1_md;
1317
1318 /* Ignore v1 queries */
1319 if (mld_in_v2_mode_only(idev))
1320 return -EINVAL;
1321
1322 mldv1_md = ntohs(mld->mld_maxdelay);
1323
1324 /* When in MLDv1 fallback and a MLDv2 router start-up being
1325 * unaware of current MLDv1 operation, the MRC == MRD mapping
1326 * only works when the exponential algorithm is not being
1327 * used (as MLDv1 is unaware of such things).
1328 *
1329 * According to the RFC author, the MLDv2 implementations
1330 * he's aware of all use a MRC < 32768 on start up queries.
1331 *
1332 * Thus, should we *ever* encounter something else larger
1333 * than that, just assume the maximum possible within our
1334 * reach.
1335 */
1336 if (!v1_query)
1337 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1338
1339 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1340
1341 /* MLDv1 router present: we need to go into v1 mode *only*
1342 * when an MLDv1 query is received as per section 9.12. of
1343 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1344 * queries MUST be of exactly 24 octets.
1345 */
1346 if (v1_query)
1347 mld_set_v1_mode(idev);
1348
1349 /* cancel MLDv2 report work */
1350 mld_gq_stop_work(idev);
1351 /* cancel the interface change work */
1352 mld_ifc_stop_work(idev);
1353 /* clear deleted report items */
1354 mld_clear_delrec(idev);
1355
1356 return 0;
1357}
1358
1359static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1360 unsigned long *max_delay)
1361{
1362 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1363
1364 mld_update_qrv(idev, mld);
1365 mld_update_qi(idev, mld);
1366 mld_update_qri(idev, mld);
1367
1368 idev->mc_maxdelay = *max_delay;
1369
1370 return;
1371}
1372
1373/* called with rcu_read_lock() */
1374void igmp6_event_query(struct sk_buff *skb)
1375{
1376 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1377
1378 if (!idev || idev->dead)
1379 goto out;
1380
1381 spin_lock_bh(&idev->mc_query_lock);
1382 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) {
1383 __skb_queue_tail(&idev->mc_query_queue, skb);
1384 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0))
1385 in6_dev_hold(idev);
1386 skb = NULL;
1387 }
1388 spin_unlock_bh(&idev->mc_query_lock);
1389out:
1390 kfree_skb(skb);
1391}
1392
1393static void __mld_query_work(struct sk_buff *skb)
1394{
1395 struct mld2_query *mlh2 = NULL;
1396 const struct in6_addr *group;
1397 unsigned long max_delay;
1398 struct inet6_dev *idev;
1399 struct ifmcaddr6 *ma;
1400 struct mld_msg *mld;
1401 int group_type;
1402 int mark = 0;
1403 int len, err;
1404
1405 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1406 goto kfree_skb;
1407
1408 /* compute payload length excluding extension headers */
1409 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1410 len -= skb_network_header_len(skb);
1411
1412 /* RFC3810 6.2
1413 * Upon reception of an MLD message that contains a Query, the node
1414 * checks if the source address of the message is a valid link-local
1415 * address, if the Hop Limit is set to 1, and if the Router Alert
1416 * option is present in the Hop-By-Hop Options header of the IPv6
1417 * packet. If any of these checks fails, the packet is dropped.
1418 */
1419 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1420 ipv6_hdr(skb)->hop_limit != 1 ||
1421 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1422 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1423 goto kfree_skb;
1424
1425 idev = in6_dev_get(skb->dev);
1426 if (!idev)
1427 goto kfree_skb;
1428
1429 mld = (struct mld_msg *)icmp6_hdr(skb);
1430 group = &mld->mld_mca;
1431 group_type = ipv6_addr_type(group);
1432
1433 if (group_type != IPV6_ADDR_ANY &&
1434 !(group_type&IPV6_ADDR_MULTICAST))
1435 goto out;
1436
1437 if (len < MLD_V1_QUERY_LEN) {
1438 goto out;
1439 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1440 err = mld_process_v1(idev, mld, &max_delay,
1441 len == MLD_V1_QUERY_LEN);
1442 if (err < 0)
1443 goto out;
1444 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1445 int srcs_offset = sizeof(struct mld2_query) -
1446 sizeof(struct icmp6hdr);
1447
1448 if (!pskb_may_pull(skb, srcs_offset))
1449 goto out;
1450
1451 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1452
1453 mld_process_v2(idev, mlh2, &max_delay);
1454
1455 if (group_type == IPV6_ADDR_ANY) { /* general query */
1456 if (mlh2->mld2q_nsrcs)
1457 goto out; /* no sources allowed */
1458
1459 mld_gq_start_work(idev);
1460 goto out;
1461 }
1462 /* mark sources to include, if group & source-specific */
1463 if (mlh2->mld2q_nsrcs != 0) {
1464 if (!pskb_may_pull(skb, srcs_offset +
1465 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1466 goto out;
1467
1468 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1469 mark = 1;
1470 }
1471 } else {
1472 goto out;
1473 }
1474
1475 if (group_type == IPV6_ADDR_ANY) {
1476 for_each_mc_mclock(idev, ma) {
1477 igmp6_group_queried(ma, max_delay);
1478 }
1479 } else {
1480 for_each_mc_mclock(idev, ma) {
1481 if (!ipv6_addr_equal(group, &ma->mca_addr))
1482 continue;
1483 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1484 /* gsquery <- gsquery && mark */
1485 if (!mark)
1486 ma->mca_flags &= ~MAF_GSQUERY;
1487 } else {
1488 /* gsquery <- mark */
1489 if (mark)
1490 ma->mca_flags |= MAF_GSQUERY;
1491 else
1492 ma->mca_flags &= ~MAF_GSQUERY;
1493 }
1494 if (!(ma->mca_flags & MAF_GSQUERY) ||
1495 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1496 igmp6_group_queried(ma, max_delay);
1497 break;
1498 }
1499 }
1500
1501out:
1502 in6_dev_put(idev);
1503kfree_skb:
1504 consume_skb(skb);
1505}
1506
1507static void mld_query_work(struct work_struct *work)
1508{
1509 struct inet6_dev *idev = container_of(to_delayed_work(work),
1510 struct inet6_dev,
1511 mc_query_work);
1512 struct sk_buff_head q;
1513 struct sk_buff *skb;
1514 bool rework = false;
1515 int cnt = 0;
1516
1517 skb_queue_head_init(&q);
1518
1519 spin_lock_bh(&idev->mc_query_lock);
1520 while ((skb = __skb_dequeue(&idev->mc_query_queue))) {
1521 __skb_queue_tail(&q, skb);
1522
1523 if (++cnt >= MLD_MAX_QUEUE) {
1524 rework = true;
1525 break;
1526 }
1527 }
1528 spin_unlock_bh(&idev->mc_query_lock);
1529
1530 mutex_lock(&idev->mc_lock);
1531 while ((skb = __skb_dequeue(&q)))
1532 __mld_query_work(skb);
1533 mutex_unlock(&idev->mc_lock);
1534
1535 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0))
1536 return;
1537
1538 in6_dev_put(idev);
1539}
1540
1541/* called with rcu_read_lock() */
1542void igmp6_event_report(struct sk_buff *skb)
1543{
1544 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1545
1546 if (!idev || idev->dead)
1547 goto out;
1548
1549 spin_lock_bh(&idev->mc_report_lock);
1550 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) {
1551 __skb_queue_tail(&idev->mc_report_queue, skb);
1552 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0))
1553 in6_dev_hold(idev);
1554 skb = NULL;
1555 }
1556 spin_unlock_bh(&idev->mc_report_lock);
1557out:
1558 kfree_skb(skb);
1559}
1560
1561static void __mld_report_work(struct sk_buff *skb)
1562{
1563 struct inet6_dev *idev;
1564 struct ifmcaddr6 *ma;
1565 struct mld_msg *mld;
1566 int addr_type;
1567
1568 /* Our own report looped back. Ignore it. */
1569 if (skb->pkt_type == PACKET_LOOPBACK)
1570 goto kfree_skb;
1571
1572 /* send our report if the MC router may not have heard this report */
1573 if (skb->pkt_type != PACKET_MULTICAST &&
1574 skb->pkt_type != PACKET_BROADCAST)
1575 goto kfree_skb;
1576
1577 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1578 goto kfree_skb;
1579
1580 mld = (struct mld_msg *)icmp6_hdr(skb);
1581
1582 /* Drop reports with not link local source */
1583 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1584 if (addr_type != IPV6_ADDR_ANY &&
1585 !(addr_type&IPV6_ADDR_LINKLOCAL))
1586 goto kfree_skb;
1587
1588 idev = in6_dev_get(skb->dev);
1589 if (!idev)
1590 goto kfree_skb;
1591
1592 /*
1593 * Cancel the work for this group
1594 */
1595
1596 for_each_mc_mclock(idev, ma) {
1597 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1598 if (cancel_delayed_work(&ma->mca_work))
1599 refcount_dec(&ma->mca_refcnt);
1600 ma->mca_flags &= ~(MAF_LAST_REPORTER |
1601 MAF_TIMER_RUNNING);
1602 break;
1603 }
1604 }
1605
1606 in6_dev_put(idev);
1607kfree_skb:
1608 consume_skb(skb);
1609}
1610
1611static void mld_report_work(struct work_struct *work)
1612{
1613 struct inet6_dev *idev = container_of(to_delayed_work(work),
1614 struct inet6_dev,
1615 mc_report_work);
1616 struct sk_buff_head q;
1617 struct sk_buff *skb;
1618 bool rework = false;
1619 int cnt = 0;
1620
1621 skb_queue_head_init(&q);
1622 spin_lock_bh(&idev->mc_report_lock);
1623 while ((skb = __skb_dequeue(&idev->mc_report_queue))) {
1624 __skb_queue_tail(&q, skb);
1625
1626 if (++cnt >= MLD_MAX_QUEUE) {
1627 rework = true;
1628 break;
1629 }
1630 }
1631 spin_unlock_bh(&idev->mc_report_lock);
1632
1633 mutex_lock(&idev->mc_lock);
1634 while ((skb = __skb_dequeue(&q)))
1635 __mld_report_work(skb);
1636 mutex_unlock(&idev->mc_lock);
1637
1638 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0))
1639 return;
1640
1641 in6_dev_put(idev);
1642}
1643
1644static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1645 int gdeleted, int sdeleted)
1646{
1647 switch (type) {
1648 case MLD2_MODE_IS_INCLUDE:
1649 case MLD2_MODE_IS_EXCLUDE:
1650 if (gdeleted || sdeleted)
1651 return false;
1652 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1653 if (pmc->mca_sfmode == MCAST_INCLUDE)
1654 return true;
1655 /* don't include if this source is excluded
1656 * in all filters
1657 */
1658 if (psf->sf_count[MCAST_INCLUDE])
1659 return type == MLD2_MODE_IS_INCLUDE;
1660 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1661 psf->sf_count[MCAST_EXCLUDE];
1662 }
1663 return false;
1664 case MLD2_CHANGE_TO_INCLUDE:
1665 if (gdeleted || sdeleted)
1666 return false;
1667 return psf->sf_count[MCAST_INCLUDE] != 0;
1668 case MLD2_CHANGE_TO_EXCLUDE:
1669 if (gdeleted || sdeleted)
1670 return false;
1671 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1672 psf->sf_count[MCAST_INCLUDE])
1673 return false;
1674 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1675 psf->sf_count[MCAST_EXCLUDE];
1676 case MLD2_ALLOW_NEW_SOURCES:
1677 if (gdeleted || !psf->sf_crcount)
1678 return false;
1679 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1680 case MLD2_BLOCK_OLD_SOURCES:
1681 if (pmc->mca_sfmode == MCAST_INCLUDE)
1682 return gdeleted || (psf->sf_crcount && sdeleted);
1683 return psf->sf_crcount && !gdeleted && !sdeleted;
1684 }
1685 return false;
1686}
1687
1688static int
1689mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1690{
1691 struct ip6_sf_list *psf;
1692 int scount = 0;
1693
1694 for_each_psf_mclock(pmc, psf) {
1695 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1696 continue;
1697 scount++;
1698 }
1699 return scount;
1700}
1701
1702static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb,
1703 struct net_device *dev, const struct in6_addr *saddr,
1704 const struct in6_addr *daddr, int proto, int len)
1705{
1706 struct ipv6hdr *hdr;
1707
1708 skb->protocol = htons(ETH_P_IPV6);
1709 skb->dev = dev;
1710
1711 skb_reset_network_header(skb);
1712 skb_put(skb, sizeof(struct ipv6hdr));
1713 hdr = ipv6_hdr(skb);
1714
1715 ip6_flow_hdr(hdr, 0, 0);
1716
1717 hdr->payload_len = htons(len);
1718 hdr->nexthdr = proto;
1719 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit);
1720
1721 hdr->saddr = *saddr;
1722 hdr->daddr = *daddr;
1723}
1724
1725static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1726{
1727 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1728 2, 0, 0, IPV6_TLV_PADN, 0 };
1729 struct net_device *dev = idev->dev;
1730 int hlen = LL_RESERVED_SPACE(dev);
1731 int tlen = dev->needed_tailroom;
1732 struct net *net = dev_net(dev);
1733 const struct in6_addr *saddr;
1734 struct in6_addr addr_buf;
1735 struct mld2_report *pmr;
1736 struct sk_buff *skb;
1737 unsigned int size;
1738 struct sock *sk;
1739 int err;
1740
1741 sk = net->ipv6.igmp_sk;
1742 /* we assume size > sizeof(ra) here
1743 * Also try to not allocate high-order pages for big MTU
1744 */
1745 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
1746 skb = sock_alloc_send_skb(sk, size, 1, &err);
1747 if (!skb)
1748 return NULL;
1749
1750 skb->priority = TC_PRIO_CONTROL;
1751 skb_reserve(skb, hlen);
1752 skb_tailroom_reserve(skb, mtu, tlen);
1753
1754 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1755 /* <draft-ietf-magma-mld-source-05.txt>:
1756 * use unspecified address as the source address
1757 * when a valid link-local address is not available.
1758 */
1759 saddr = &in6addr_any;
1760 } else
1761 saddr = &addr_buf;
1762
1763 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1764
1765 skb_put_data(skb, ra, sizeof(ra));
1766
1767 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1768 skb_put(skb, sizeof(*pmr));
1769 pmr = (struct mld2_report *)skb_transport_header(skb);
1770 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1771 pmr->mld2r_resv1 = 0;
1772 pmr->mld2r_cksum = 0;
1773 pmr->mld2r_resv2 = 0;
1774 pmr->mld2r_ngrec = 0;
1775 return skb;
1776}
1777
1778static void mld_sendpack(struct sk_buff *skb)
1779{
1780 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1781 struct mld2_report *pmr =
1782 (struct mld2_report *)skb_transport_header(skb);
1783 int payload_len, mldlen;
1784 struct inet6_dev *idev;
1785 struct net *net = dev_net(skb->dev);
1786 int err;
1787 struct flowi6 fl6;
1788 struct dst_entry *dst;
1789
1790 rcu_read_lock();
1791 idev = __in6_dev_get(skb->dev);
1792 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
1793
1794 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1795 sizeof(*pip6);
1796 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1797 pip6->payload_len = htons(payload_len);
1798
1799 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1800 IPPROTO_ICMPV6,
1801 csum_partial(skb_transport_header(skb),
1802 mldlen, 0));
1803
1804 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1805 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1806 skb->dev->ifindex);
1807 dst = icmp6_dst_alloc(skb->dev, &fl6);
1808
1809 err = 0;
1810 if (IS_ERR(dst)) {
1811 err = PTR_ERR(dst);
1812 dst = NULL;
1813 }
1814 skb_dst_set(skb, dst);
1815 if (err)
1816 goto err_out;
1817
1818 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1819 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1820 dst_output);
1821out:
1822 if (!err) {
1823 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1824 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1825 } else {
1826 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1827 }
1828
1829 rcu_read_unlock();
1830 return;
1831
1832err_out:
1833 kfree_skb(skb);
1834 goto out;
1835}
1836
1837static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1838{
1839 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1840}
1841
1842static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1843 int type, struct mld2_grec **ppgr, unsigned int mtu)
1844{
1845 struct mld2_report *pmr;
1846 struct mld2_grec *pgr;
1847
1848 if (!skb) {
1849 skb = mld_newpack(pmc->idev, mtu);
1850 if (!skb)
1851 return NULL;
1852 }
1853 pgr = skb_put(skb, sizeof(struct mld2_grec));
1854 pgr->grec_type = type;
1855 pgr->grec_auxwords = 0;
1856 pgr->grec_nsrcs = 0;
1857 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1858 pmr = (struct mld2_report *)skb_transport_header(skb);
1859 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1860 *ppgr = pgr;
1861 return skb;
1862}
1863
1864#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1865
1866/* called with mc_lock */
1867static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1868 int type, int gdeleted, int sdeleted,
1869 int crsend)
1870{
1871 struct ip6_sf_list *psf, *psf_prev, *psf_next;
1872 int scount, stotal, first, isquery, truncate;
1873 struct ip6_sf_list __rcu **psf_list;
1874 struct inet6_dev *idev = pmc->idev;
1875 struct net_device *dev = idev->dev;
1876 struct mld2_grec *pgr = NULL;
1877 struct mld2_report *pmr;
1878 unsigned int mtu;
1879
1880 if (pmc->mca_flags & MAF_NOREPORT)
1881 return skb;
1882
1883 mtu = READ_ONCE(dev->mtu);
1884 if (mtu < IPV6_MIN_MTU)
1885 return skb;
1886
1887 isquery = type == MLD2_MODE_IS_INCLUDE ||
1888 type == MLD2_MODE_IS_EXCLUDE;
1889 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1890 type == MLD2_CHANGE_TO_EXCLUDE;
1891
1892 stotal = scount = 0;
1893
1894 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1895
1896 if (!rcu_access_pointer(*psf_list))
1897 goto empty_source;
1898
1899 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1900
1901 /* EX and TO_EX get a fresh packet, if needed */
1902 if (truncate) {
1903 if (pmr && pmr->mld2r_ngrec &&
1904 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1905 if (skb)
1906 mld_sendpack(skb);
1907 skb = mld_newpack(idev, mtu);
1908 }
1909 }
1910 first = 1;
1911 psf_prev = NULL;
1912 for (psf = mc_dereference(*psf_list, idev);
1913 psf;
1914 psf = psf_next) {
1915 struct in6_addr *psrc;
1916
1917 psf_next = mc_dereference(psf->sf_next, idev);
1918
1919 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1920 psf_prev = psf;
1921 continue;
1922 }
1923
1924 /* Based on RFC3810 6.1. Should not send source-list change
1925 * records when there is a filter mode change.
1926 */
1927 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1928 (!gdeleted && pmc->mca_crcount)) &&
1929 (type == MLD2_ALLOW_NEW_SOURCES ||
1930 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1931 goto decrease_sf_crcount;
1932
1933 /* clear marks on query responses */
1934 if (isquery)
1935 psf->sf_gsresp = 0;
1936
1937 if (AVAILABLE(skb) < sizeof(*psrc) +
1938 first*sizeof(struct mld2_grec)) {
1939 if (truncate && !first)
1940 break; /* truncate these */
1941 if (pgr)
1942 pgr->grec_nsrcs = htons(scount);
1943 if (skb)
1944 mld_sendpack(skb);
1945 skb = mld_newpack(idev, mtu);
1946 first = 1;
1947 scount = 0;
1948 }
1949 if (first) {
1950 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1951 first = 0;
1952 }
1953 if (!skb)
1954 return NULL;
1955 psrc = skb_put(skb, sizeof(*psrc));
1956 *psrc = psf->sf_addr;
1957 scount++; stotal++;
1958 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1959 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1960decrease_sf_crcount:
1961 psf->sf_crcount--;
1962 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1963 if (psf_prev)
1964 rcu_assign_pointer(psf_prev->sf_next,
1965 mc_dereference(psf->sf_next, idev));
1966 else
1967 rcu_assign_pointer(*psf_list,
1968 mc_dereference(psf->sf_next, idev));
1969 kfree_rcu(psf, rcu);
1970 continue;
1971 }
1972 }
1973 psf_prev = psf;
1974 }
1975
1976empty_source:
1977 if (!stotal) {
1978 if (type == MLD2_ALLOW_NEW_SOURCES ||
1979 type == MLD2_BLOCK_OLD_SOURCES)
1980 return skb;
1981 if (pmc->mca_crcount || isquery || crsend) {
1982 /* make sure we have room for group header */
1983 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1984 mld_sendpack(skb);
1985 skb = NULL; /* add_grhead will get a new one */
1986 }
1987 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1988 }
1989 }
1990 if (pgr)
1991 pgr->grec_nsrcs = htons(scount);
1992
1993 if (isquery)
1994 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1995 return skb;
1996}
1997
1998/* called with mc_lock */
1999static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2000{
2001 struct sk_buff *skb = NULL;
2002 int type;
2003
2004 if (!pmc) {
2005 for_each_mc_mclock(idev, pmc) {
2006 if (pmc->mca_flags & MAF_NOREPORT)
2007 continue;
2008 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2009 type = MLD2_MODE_IS_EXCLUDE;
2010 else
2011 type = MLD2_MODE_IS_INCLUDE;
2012 skb = add_grec(skb, pmc, type, 0, 0, 0);
2013 }
2014 } else {
2015 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2016 type = MLD2_MODE_IS_EXCLUDE;
2017 else
2018 type = MLD2_MODE_IS_INCLUDE;
2019 skb = add_grec(skb, pmc, type, 0, 0, 0);
2020 }
2021 if (skb)
2022 mld_sendpack(skb);
2023}
2024
2025/*
2026 * remove zero-count source records from a source filter list
2027 * called with mc_lock
2028 */
2029static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
2030{
2031 struct ip6_sf_list *psf_prev, *psf_next, *psf;
2032
2033 psf_prev = NULL;
2034 for (psf = mc_dereference(*ppsf, idev);
2035 psf;
2036 psf = psf_next) {
2037 psf_next = mc_dereference(psf->sf_next, idev);
2038 if (psf->sf_crcount == 0) {
2039 if (psf_prev)
2040 rcu_assign_pointer(psf_prev->sf_next,
2041 mc_dereference(psf->sf_next, idev));
2042 else
2043 rcu_assign_pointer(*ppsf,
2044 mc_dereference(psf->sf_next, idev));
2045 kfree_rcu(psf, rcu);
2046 } else {
2047 psf_prev = psf;
2048 }
2049 }
2050}
2051
2052/* called with mc_lock */
2053static void mld_send_cr(struct inet6_dev *idev)
2054{
2055 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2056 struct sk_buff *skb = NULL;
2057 int type, dtype;
2058
2059 /* deleted MCA's */
2060 pmc_prev = NULL;
2061 for (pmc = mc_dereference(idev->mc_tomb, idev);
2062 pmc;
2063 pmc = pmc_next) {
2064 pmc_next = mc_dereference(pmc->next, idev);
2065 if (pmc->mca_sfmode == MCAST_INCLUDE) {
2066 type = MLD2_BLOCK_OLD_SOURCES;
2067 dtype = MLD2_BLOCK_OLD_SOURCES;
2068 skb = add_grec(skb, pmc, type, 1, 0, 0);
2069 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
2070 }
2071 if (pmc->mca_crcount) {
2072 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2073 type = MLD2_CHANGE_TO_INCLUDE;
2074 skb = add_grec(skb, pmc, type, 1, 0, 0);
2075 }
2076 pmc->mca_crcount--;
2077 if (pmc->mca_crcount == 0) {
2078 mld_clear_zeros(&pmc->mca_tomb, idev);
2079 mld_clear_zeros(&pmc->mca_sources, idev);
2080 }
2081 }
2082 if (pmc->mca_crcount == 0 &&
2083 !rcu_access_pointer(pmc->mca_tomb) &&
2084 !rcu_access_pointer(pmc->mca_sources)) {
2085 if (pmc_prev)
2086 rcu_assign_pointer(pmc_prev->next, pmc_next);
2087 else
2088 rcu_assign_pointer(idev->mc_tomb, pmc_next);
2089 in6_dev_put(pmc->idev);
2090 kfree_rcu(pmc, rcu);
2091 } else
2092 pmc_prev = pmc;
2093 }
2094
2095 /* change recs */
2096 for_each_mc_mclock(idev, pmc) {
2097 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2098 type = MLD2_BLOCK_OLD_SOURCES;
2099 dtype = MLD2_ALLOW_NEW_SOURCES;
2100 } else {
2101 type = MLD2_ALLOW_NEW_SOURCES;
2102 dtype = MLD2_BLOCK_OLD_SOURCES;
2103 }
2104 skb = add_grec(skb, pmc, type, 0, 0, 0);
2105 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
2106
2107 /* filter mode changes */
2108 if (pmc->mca_crcount) {
2109 if (pmc->mca_sfmode == MCAST_EXCLUDE)
2110 type = MLD2_CHANGE_TO_EXCLUDE;
2111 else
2112 type = MLD2_CHANGE_TO_INCLUDE;
2113 skb = add_grec(skb, pmc, type, 0, 0, 0);
2114 pmc->mca_crcount--;
2115 }
2116 }
2117 if (!skb)
2118 return;
2119 (void) mld_sendpack(skb);
2120}
2121
2122static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2123{
2124 struct net *net = dev_net(dev);
2125 struct sock *sk = net->ipv6.igmp_sk;
2126 struct inet6_dev *idev;
2127 struct sk_buff *skb;
2128 struct mld_msg *hdr;
2129 const struct in6_addr *snd_addr, *saddr;
2130 struct in6_addr addr_buf;
2131 int hlen = LL_RESERVED_SPACE(dev);
2132 int tlen = dev->needed_tailroom;
2133 int err, len, payload_len, full_len;
2134 u8 ra[8] = { IPPROTO_ICMPV6, 0,
2135 IPV6_TLV_ROUTERALERT, 2, 0, 0,
2136 IPV6_TLV_PADN, 0 };
2137 struct flowi6 fl6;
2138 struct dst_entry *dst;
2139
2140 if (type == ICMPV6_MGM_REDUCTION)
2141 snd_addr = &in6addr_linklocal_allrouters;
2142 else
2143 snd_addr = addr;
2144
2145 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2146 payload_len = len + sizeof(ra);
2147 full_len = sizeof(struct ipv6hdr) + payload_len;
2148
2149 rcu_read_lock();
2150 IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_OUTREQUESTS);
2151 rcu_read_unlock();
2152
2153 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2154
2155 if (!skb) {
2156 rcu_read_lock();
2157 IP6_INC_STATS(net, __in6_dev_get(dev),
2158 IPSTATS_MIB_OUTDISCARDS);
2159 rcu_read_unlock();
2160 return;
2161 }
2162 skb->priority = TC_PRIO_CONTROL;
2163 skb_reserve(skb, hlen);
2164
2165 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2166 /* <draft-ietf-magma-mld-source-05.txt>:
2167 * use unspecified address as the source address
2168 * when a valid link-local address is not available.
2169 */
2170 saddr = &in6addr_any;
2171 } else
2172 saddr = &addr_buf;
2173
2174 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2175
2176 skb_put_data(skb, ra, sizeof(ra));
2177
2178 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2179 hdr->mld_type = type;
2180 hdr->mld_mca = *addr;
2181
2182 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2183 IPPROTO_ICMPV6,
2184 csum_partial(hdr, len, 0));
2185
2186 rcu_read_lock();
2187 idev = __in6_dev_get(skb->dev);
2188
2189 icmpv6_flow_init(sk, &fl6, type,
2190 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2191 skb->dev->ifindex);
2192 dst = icmp6_dst_alloc(skb->dev, &fl6);
2193 if (IS_ERR(dst)) {
2194 err = PTR_ERR(dst);
2195 goto err_out;
2196 }
2197
2198 skb_dst_set(skb, dst);
2199 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2200 net, sk, skb, NULL, skb->dev,
2201 dst_output);
2202out:
2203 if (!err) {
2204 ICMP6MSGOUT_INC_STATS(net, idev, type);
2205 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2206 } else
2207 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2208
2209 rcu_read_unlock();
2210 return;
2211
2212err_out:
2213 kfree_skb(skb);
2214 goto out;
2215}
2216
2217/* called with mc_lock */
2218static void mld_send_initial_cr(struct inet6_dev *idev)
2219{
2220 struct sk_buff *skb;
2221 struct ifmcaddr6 *pmc;
2222 int type;
2223
2224 if (mld_in_v1_mode(idev))
2225 return;
2226
2227 skb = NULL;
2228 for_each_mc_mclock(idev, pmc) {
2229 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2230 type = MLD2_CHANGE_TO_EXCLUDE;
2231 else
2232 type = MLD2_ALLOW_NEW_SOURCES;
2233 skb = add_grec(skb, pmc, type, 0, 0, 1);
2234 }
2235 if (skb)
2236 mld_sendpack(skb);
2237}
2238
2239void ipv6_mc_dad_complete(struct inet6_dev *idev)
2240{
2241 mutex_lock(&idev->mc_lock);
2242 idev->mc_dad_count = idev->mc_qrv;
2243 if (idev->mc_dad_count) {
2244 mld_send_initial_cr(idev);
2245 idev->mc_dad_count--;
2246 if (idev->mc_dad_count)
2247 mld_dad_start_work(idev,
2248 unsolicited_report_interval(idev));
2249 }
2250 mutex_unlock(&idev->mc_lock);
2251}
2252
2253static void mld_dad_work(struct work_struct *work)
2254{
2255 struct inet6_dev *idev = container_of(to_delayed_work(work),
2256 struct inet6_dev,
2257 mc_dad_work);
2258 mutex_lock(&idev->mc_lock);
2259 mld_send_initial_cr(idev);
2260 if (idev->mc_dad_count) {
2261 idev->mc_dad_count--;
2262 if (idev->mc_dad_count)
2263 mld_dad_start_work(idev,
2264 unsolicited_report_interval(idev));
2265 }
2266 mutex_unlock(&idev->mc_lock);
2267 in6_dev_put(idev);
2268}
2269
2270/* called with mc_lock */
2271static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2272 const struct in6_addr *psfsrc)
2273{
2274 struct ip6_sf_list *psf, *psf_prev;
2275 int rv = 0;
2276
2277 psf_prev = NULL;
2278 for_each_psf_mclock(pmc, psf) {
2279 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2280 break;
2281 psf_prev = psf;
2282 }
2283 if (!psf || psf->sf_count[sfmode] == 0) {
2284 /* source filter not found, or count wrong => bug */
2285 return -ESRCH;
2286 }
2287 psf->sf_count[sfmode]--;
2288 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2289 struct inet6_dev *idev = pmc->idev;
2290
2291 /* no more filters for this source */
2292 if (psf_prev)
2293 rcu_assign_pointer(psf_prev->sf_next,
2294 mc_dereference(psf->sf_next, idev));
2295 else
2296 rcu_assign_pointer(pmc->mca_sources,
2297 mc_dereference(psf->sf_next, idev));
2298
2299 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2300 !mld_in_v1_mode(idev)) {
2301 psf->sf_crcount = idev->mc_qrv;
2302 rcu_assign_pointer(psf->sf_next,
2303 mc_dereference(pmc->mca_tomb, idev));
2304 rcu_assign_pointer(pmc->mca_tomb, psf);
2305 rv = 1;
2306 } else {
2307 kfree_rcu(psf, rcu);
2308 }
2309 }
2310 return rv;
2311}
2312
2313/* called with mc_lock */
2314static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2315 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2316 int delta)
2317{
2318 struct ifmcaddr6 *pmc;
2319 int changerec = 0;
2320 int i, err;
2321
2322 if (!idev)
2323 return -ENODEV;
2324
2325 for_each_mc_mclock(idev, pmc) {
2326 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2327 break;
2328 }
2329 if (!pmc)
2330 return -ESRCH;
2331
2332 sf_markstate(pmc);
2333 if (!delta) {
2334 if (!pmc->mca_sfcount[sfmode])
2335 return -EINVAL;
2336
2337 pmc->mca_sfcount[sfmode]--;
2338 }
2339 err = 0;
2340 for (i = 0; i < sfcount; i++) {
2341 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2342
2343 changerec |= rv > 0;
2344 if (!err && rv < 0)
2345 err = rv;
2346 }
2347 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2348 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2349 pmc->mca_sfcount[MCAST_INCLUDE]) {
2350 struct ip6_sf_list *psf;
2351
2352 /* filter mode change */
2353 pmc->mca_sfmode = MCAST_INCLUDE;
2354 pmc->mca_crcount = idev->mc_qrv;
2355 idev->mc_ifc_count = pmc->mca_crcount;
2356 for_each_psf_mclock(pmc, psf)
2357 psf->sf_crcount = 0;
2358 mld_ifc_event(pmc->idev);
2359 } else if (sf_setstate(pmc) || changerec) {
2360 mld_ifc_event(pmc->idev);
2361 }
2362
2363 return err;
2364}
2365
2366/*
2367 * Add multicast single-source filter to the interface list
2368 * called with mc_lock
2369 */
2370static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2371 const struct in6_addr *psfsrc)
2372{
2373 struct ip6_sf_list *psf, *psf_prev;
2374
2375 psf_prev = NULL;
2376 for_each_psf_mclock(pmc, psf) {
2377 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2378 break;
2379 psf_prev = psf;
2380 }
2381 if (!psf) {
2382 psf = kzalloc(sizeof(*psf), GFP_KERNEL);
2383 if (!psf)
2384 return -ENOBUFS;
2385
2386 psf->sf_addr = *psfsrc;
2387 if (psf_prev) {
2388 rcu_assign_pointer(psf_prev->sf_next, psf);
2389 } else {
2390 rcu_assign_pointer(pmc->mca_sources, psf);
2391 }
2392 }
2393 psf->sf_count[sfmode]++;
2394 return 0;
2395}
2396
2397/* called with mc_lock */
2398static void sf_markstate(struct ifmcaddr6 *pmc)
2399{
2400 struct ip6_sf_list *psf;
2401 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2402
2403 for_each_psf_mclock(pmc, psf) {
2404 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2405 psf->sf_oldin = mca_xcount ==
2406 psf->sf_count[MCAST_EXCLUDE] &&
2407 !psf->sf_count[MCAST_INCLUDE];
2408 } else {
2409 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2410 }
2411 }
2412}
2413
2414/* called with mc_lock */
2415static int sf_setstate(struct ifmcaddr6 *pmc)
2416{
2417 struct ip6_sf_list *psf, *dpsf;
2418 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2419 int qrv = pmc->idev->mc_qrv;
2420 int new_in, rv;
2421
2422 rv = 0;
2423 for_each_psf_mclock(pmc, psf) {
2424 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2425 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2426 !psf->sf_count[MCAST_INCLUDE];
2427 } else
2428 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2429 if (new_in) {
2430 if (!psf->sf_oldin) {
2431 struct ip6_sf_list *prev = NULL;
2432
2433 for_each_psf_tomb(pmc, dpsf) {
2434 if (ipv6_addr_equal(&dpsf->sf_addr,
2435 &psf->sf_addr))
2436 break;
2437 prev = dpsf;
2438 }
2439 if (dpsf) {
2440 if (prev)
2441 rcu_assign_pointer(prev->sf_next,
2442 mc_dereference(dpsf->sf_next,
2443 pmc->idev));
2444 else
2445 rcu_assign_pointer(pmc->mca_tomb,
2446 mc_dereference(dpsf->sf_next,
2447 pmc->idev));
2448 kfree_rcu(dpsf, rcu);
2449 }
2450 psf->sf_crcount = qrv;
2451 rv++;
2452 }
2453 } else if (psf->sf_oldin) {
2454 psf->sf_crcount = 0;
2455 /*
2456 * add or update "delete" records if an active filter
2457 * is now inactive
2458 */
2459
2460 for_each_psf_tomb(pmc, dpsf)
2461 if (ipv6_addr_equal(&dpsf->sf_addr,
2462 &psf->sf_addr))
2463 break;
2464 if (!dpsf) {
2465 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL);
2466 if (!dpsf)
2467 continue;
2468 *dpsf = *psf;
2469 rcu_assign_pointer(dpsf->sf_next,
2470 mc_dereference(pmc->mca_tomb, pmc->idev));
2471 rcu_assign_pointer(pmc->mca_tomb, dpsf);
2472 }
2473 dpsf->sf_crcount = qrv;
2474 rv++;
2475 }
2476 }
2477 return rv;
2478}
2479
2480/*
2481 * Add multicast source filter list to the interface list
2482 * called with mc_lock
2483 */
2484static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2485 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2486 int delta)
2487{
2488 struct ifmcaddr6 *pmc;
2489 int isexclude;
2490 int i, err;
2491
2492 if (!idev)
2493 return -ENODEV;
2494
2495 for_each_mc_mclock(idev, pmc) {
2496 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2497 break;
2498 }
2499 if (!pmc)
2500 return -ESRCH;
2501
2502 sf_markstate(pmc);
2503 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2504 if (!delta)
2505 pmc->mca_sfcount[sfmode]++;
2506 err = 0;
2507 for (i = 0; i < sfcount; i++) {
2508 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2509 if (err)
2510 break;
2511 }
2512 if (err) {
2513 int j;
2514
2515 if (!delta)
2516 pmc->mca_sfcount[sfmode]--;
2517 for (j = 0; j < i; j++)
2518 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2519 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2520 struct ip6_sf_list *psf;
2521
2522 /* filter mode change */
2523 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2524 pmc->mca_sfmode = MCAST_EXCLUDE;
2525 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2526 pmc->mca_sfmode = MCAST_INCLUDE;
2527 /* else no filters; keep old mode for reports */
2528
2529 pmc->mca_crcount = idev->mc_qrv;
2530 idev->mc_ifc_count = pmc->mca_crcount;
2531 for_each_psf_mclock(pmc, psf)
2532 psf->sf_crcount = 0;
2533 mld_ifc_event(idev);
2534 } else if (sf_setstate(pmc)) {
2535 mld_ifc_event(idev);
2536 }
2537 return err;
2538}
2539
2540/* called with mc_lock */
2541static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2542{
2543 struct ip6_sf_list *psf, *nextpsf;
2544
2545 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev);
2546 psf;
2547 psf = nextpsf) {
2548 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2549 kfree_rcu(psf, rcu);
2550 }
2551 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
2552 for (psf = mc_dereference(pmc->mca_sources, pmc->idev);
2553 psf;
2554 psf = nextpsf) {
2555 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2556 kfree_rcu(psf, rcu);
2557 }
2558 RCU_INIT_POINTER(pmc->mca_sources, NULL);
2559 pmc->mca_sfmode = MCAST_EXCLUDE;
2560 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2561 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2562}
2563
2564/* called with mc_lock */
2565static void igmp6_join_group(struct ifmcaddr6 *ma)
2566{
2567 unsigned long delay;
2568
2569 if (ma->mca_flags & MAF_NOREPORT)
2570 return;
2571
2572 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2573
2574 delay = get_random_u32_below(unsolicited_report_interval(ma->idev));
2575
2576 if (cancel_delayed_work(&ma->mca_work)) {
2577 refcount_dec(&ma->mca_refcnt);
2578 delay = ma->mca_work.timer.expires - jiffies;
2579 }
2580
2581 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
2582 refcount_inc(&ma->mca_refcnt);
2583 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2584}
2585
2586static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2587 struct inet6_dev *idev)
2588{
2589 struct ip6_sf_socklist *psl;
2590 int err;
2591
2592 psl = sock_dereference(iml->sflist, sk);
2593
2594 if (idev)
2595 mutex_lock(&idev->mc_lock);
2596
2597 if (!psl) {
2598 /* any-source empty exclude case */
2599 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2600 } else {
2601 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2602 psl->sl_count, psl->sl_addr, 0);
2603 RCU_INIT_POINTER(iml->sflist, NULL);
2604 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2605 &sk->sk_omem_alloc);
2606 kfree_rcu(psl, rcu);
2607 }
2608
2609 if (idev)
2610 mutex_unlock(&idev->mc_lock);
2611
2612 return err;
2613}
2614
2615/* called with mc_lock */
2616static void igmp6_leave_group(struct ifmcaddr6 *ma)
2617{
2618 if (mld_in_v1_mode(ma->idev)) {
2619 if (ma->mca_flags & MAF_LAST_REPORTER) {
2620 igmp6_send(&ma->mca_addr, ma->idev->dev,
2621 ICMPV6_MGM_REDUCTION);
2622 }
2623 } else {
2624 mld_add_delrec(ma->idev, ma);
2625 mld_ifc_event(ma->idev);
2626 }
2627}
2628
2629static void mld_gq_work(struct work_struct *work)
2630{
2631 struct inet6_dev *idev = container_of(to_delayed_work(work),
2632 struct inet6_dev,
2633 mc_gq_work);
2634
2635 mutex_lock(&idev->mc_lock);
2636 mld_send_report(idev, NULL);
2637 idev->mc_gq_running = 0;
2638 mutex_unlock(&idev->mc_lock);
2639
2640 in6_dev_put(idev);
2641}
2642
2643static void mld_ifc_work(struct work_struct *work)
2644{
2645 struct inet6_dev *idev = container_of(to_delayed_work(work),
2646 struct inet6_dev,
2647 mc_ifc_work);
2648
2649 mutex_lock(&idev->mc_lock);
2650 mld_send_cr(idev);
2651
2652 if (idev->mc_ifc_count) {
2653 idev->mc_ifc_count--;
2654 if (idev->mc_ifc_count)
2655 mld_ifc_start_work(idev,
2656 unsolicited_report_interval(idev));
2657 }
2658 mutex_unlock(&idev->mc_lock);
2659 in6_dev_put(idev);
2660}
2661
2662/* called with mc_lock */
2663static void mld_ifc_event(struct inet6_dev *idev)
2664{
2665 if (mld_in_v1_mode(idev))
2666 return;
2667
2668 idev->mc_ifc_count = idev->mc_qrv;
2669 mld_ifc_start_work(idev, 1);
2670}
2671
2672static void mld_mca_work(struct work_struct *work)
2673{
2674 struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2675 struct ifmcaddr6, mca_work);
2676
2677 mutex_lock(&ma->idev->mc_lock);
2678 if (mld_in_v1_mode(ma->idev))
2679 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2680 else
2681 mld_send_report(ma->idev, ma);
2682 ma->mca_flags |= MAF_LAST_REPORTER;
2683 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2684 mutex_unlock(&ma->idev->mc_lock);
2685
2686 ma_put(ma);
2687}
2688
2689/* Device changing type */
2690
2691void ipv6_mc_unmap(struct inet6_dev *idev)
2692{
2693 struct ifmcaddr6 *i;
2694
2695 /* Install multicast list, except for all-nodes (already installed) */
2696
2697 mutex_lock(&idev->mc_lock);
2698 for_each_mc_mclock(idev, i)
2699 igmp6_group_dropped(i);
2700 mutex_unlock(&idev->mc_lock);
2701}
2702
2703void ipv6_mc_remap(struct inet6_dev *idev)
2704{
2705 ipv6_mc_up(idev);
2706}
2707
2708/* Device going down */
2709void ipv6_mc_down(struct inet6_dev *idev)
2710{
2711 struct ifmcaddr6 *i;
2712
2713 mutex_lock(&idev->mc_lock);
2714 /* Withdraw multicast list */
2715 for_each_mc_mclock(idev, i)
2716 igmp6_group_dropped(i);
2717 mutex_unlock(&idev->mc_lock);
2718
2719 /* Should stop work after group drop. or we will
2720 * start work again in mld_ifc_event()
2721 */
2722 synchronize_net();
2723 mld_query_stop_work(idev);
2724 mld_report_stop_work(idev);
2725
2726 mutex_lock(&idev->mc_lock);
2727 mld_ifc_stop_work(idev);
2728 mld_gq_stop_work(idev);
2729 mutex_unlock(&idev->mc_lock);
2730
2731 mld_dad_stop_work(idev);
2732}
2733
2734static void ipv6_mc_reset(struct inet6_dev *idev)
2735{
2736 idev->mc_qrv = sysctl_mld_qrv;
2737 idev->mc_qi = MLD_QI_DEFAULT;
2738 idev->mc_qri = MLD_QRI_DEFAULT;
2739 idev->mc_v1_seen = 0;
2740 idev->mc_maxdelay = unsolicited_report_interval(idev);
2741}
2742
2743/* Device going up */
2744
2745void ipv6_mc_up(struct inet6_dev *idev)
2746{
2747 struct ifmcaddr6 *i;
2748
2749 /* Install multicast list, except for all-nodes (already installed) */
2750
2751 ipv6_mc_reset(idev);
2752 mutex_lock(&idev->mc_lock);
2753 for_each_mc_mclock(idev, i) {
2754 mld_del_delrec(idev, i);
2755 igmp6_group_added(i);
2756 }
2757 mutex_unlock(&idev->mc_lock);
2758}
2759
2760/* IPv6 device initialization. */
2761
2762void ipv6_mc_init_dev(struct inet6_dev *idev)
2763{
2764 idev->mc_gq_running = 0;
2765 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work);
2766 RCU_INIT_POINTER(idev->mc_tomb, NULL);
2767 idev->mc_ifc_count = 0;
2768 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work);
2769 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work);
2770 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work);
2771 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work);
2772 skb_queue_head_init(&idev->mc_query_queue);
2773 skb_queue_head_init(&idev->mc_report_queue);
2774 spin_lock_init(&idev->mc_query_lock);
2775 spin_lock_init(&idev->mc_report_lock);
2776 mutex_init(&idev->mc_lock);
2777 ipv6_mc_reset(idev);
2778}
2779
2780/*
2781 * Device is about to be destroyed: clean up.
2782 */
2783
2784void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2785{
2786 struct ifmcaddr6 *i;
2787
2788 /* Deactivate works */
2789 ipv6_mc_down(idev);
2790 mutex_lock(&idev->mc_lock);
2791 mld_clear_delrec(idev);
2792 mutex_unlock(&idev->mc_lock);
2793 mld_clear_query(idev);
2794 mld_clear_report(idev);
2795
2796 /* Delete all-nodes address. */
2797 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2798 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2799 * fail.
2800 */
2801 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2802
2803 if (idev->cnf.forwarding)
2804 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2805
2806 mutex_lock(&idev->mc_lock);
2807 while ((i = mc_dereference(idev->mc_list, idev))) {
2808 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev));
2809
2810 ip6_mc_clear_src(i);
2811 ma_put(i);
2812 }
2813 mutex_unlock(&idev->mc_lock);
2814}
2815
2816static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2817{
2818 struct ifmcaddr6 *pmc;
2819
2820 ASSERT_RTNL();
2821
2822 mutex_lock(&idev->mc_lock);
2823 if (mld_in_v1_mode(idev)) {
2824 for_each_mc_mclock(idev, pmc)
2825 igmp6_join_group(pmc);
2826 } else {
2827 mld_send_report(idev, NULL);
2828 }
2829 mutex_unlock(&idev->mc_lock);
2830}
2831
2832static int ipv6_mc_netdev_event(struct notifier_block *this,
2833 unsigned long event,
2834 void *ptr)
2835{
2836 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2837 struct inet6_dev *idev = __in6_dev_get(dev);
2838
2839 switch (event) {
2840 case NETDEV_RESEND_IGMP:
2841 if (idev)
2842 ipv6_mc_rejoin_groups(idev);
2843 break;
2844 default:
2845 break;
2846 }
2847
2848 return NOTIFY_DONE;
2849}
2850
2851static struct notifier_block igmp6_netdev_notifier = {
2852 .notifier_call = ipv6_mc_netdev_event,
2853};
2854
2855#ifdef CONFIG_PROC_FS
2856struct igmp6_mc_iter_state {
2857 struct seq_net_private p;
2858 struct net_device *dev;
2859 struct inet6_dev *idev;
2860};
2861
2862#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2863
2864static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2865{
2866 struct ifmcaddr6 *im = NULL;
2867 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2868 struct net *net = seq_file_net(seq);
2869
2870 state->idev = NULL;
2871 for_each_netdev_rcu(net, state->dev) {
2872 struct inet6_dev *idev;
2873 idev = __in6_dev_get(state->dev);
2874 if (!idev)
2875 continue;
2876
2877 im = rcu_dereference(idev->mc_list);
2878 if (im) {
2879 state->idev = idev;
2880 break;
2881 }
2882 }
2883 return im;
2884}
2885
2886static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2887{
2888 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2889
2890 im = rcu_dereference(im->next);
2891 while (!im) {
2892 state->dev = next_net_device_rcu(state->dev);
2893 if (!state->dev) {
2894 state->idev = NULL;
2895 break;
2896 }
2897 state->idev = __in6_dev_get(state->dev);
2898 if (!state->idev)
2899 continue;
2900 im = rcu_dereference(state->idev->mc_list);
2901 }
2902 return im;
2903}
2904
2905static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2906{
2907 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2908 if (im)
2909 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2910 --pos;
2911 return pos ? NULL : im;
2912}
2913
2914static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2915 __acquires(RCU)
2916{
2917 rcu_read_lock();
2918 return igmp6_mc_get_idx(seq, *pos);
2919}
2920
2921static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2922{
2923 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2924
2925 ++*pos;
2926 return im;
2927}
2928
2929static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2930 __releases(RCU)
2931{
2932 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2933
2934 if (likely(state->idev))
2935 state->idev = NULL;
2936 state->dev = NULL;
2937 rcu_read_unlock();
2938}
2939
2940static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2941{
2942 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2943 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2944
2945 seq_printf(seq,
2946 "%-4d %-15s %pi6 %5d %08X %ld\n",
2947 state->dev->ifindex, state->dev->name,
2948 &im->mca_addr,
2949 im->mca_users, im->mca_flags,
2950 (im->mca_flags & MAF_TIMER_RUNNING) ?
2951 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0);
2952 return 0;
2953}
2954
2955static const struct seq_operations igmp6_mc_seq_ops = {
2956 .start = igmp6_mc_seq_start,
2957 .next = igmp6_mc_seq_next,
2958 .stop = igmp6_mc_seq_stop,
2959 .show = igmp6_mc_seq_show,
2960};
2961
2962struct igmp6_mcf_iter_state {
2963 struct seq_net_private p;
2964 struct net_device *dev;
2965 struct inet6_dev *idev;
2966 struct ifmcaddr6 *im;
2967};
2968
2969#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2970
2971static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2972{
2973 struct ip6_sf_list *psf = NULL;
2974 struct ifmcaddr6 *im = NULL;
2975 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2976 struct net *net = seq_file_net(seq);
2977
2978 state->idev = NULL;
2979 state->im = NULL;
2980 for_each_netdev_rcu(net, state->dev) {
2981 struct inet6_dev *idev;
2982 idev = __in6_dev_get(state->dev);
2983 if (unlikely(idev == NULL))
2984 continue;
2985
2986 im = rcu_dereference(idev->mc_list);
2987 if (likely(im)) {
2988 psf = rcu_dereference(im->mca_sources);
2989 if (likely(psf)) {
2990 state->im = im;
2991 state->idev = idev;
2992 break;
2993 }
2994 }
2995 }
2996 return psf;
2997}
2998
2999static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
3000{
3001 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3002
3003 psf = rcu_dereference(psf->sf_next);
3004 while (!psf) {
3005 state->im = rcu_dereference(state->im->next);
3006 while (!state->im) {
3007 state->dev = next_net_device_rcu(state->dev);
3008 if (!state->dev) {
3009 state->idev = NULL;
3010 goto out;
3011 }
3012 state->idev = __in6_dev_get(state->dev);
3013 if (!state->idev)
3014 continue;
3015 state->im = rcu_dereference(state->idev->mc_list);
3016 }
3017 psf = rcu_dereference(state->im->mca_sources);
3018 }
3019out:
3020 return psf;
3021}
3022
3023static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3024{
3025 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3026 if (psf)
3027 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3028 --pos;
3029 return pos ? NULL : psf;
3030}
3031
3032static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3033 __acquires(RCU)
3034{
3035 rcu_read_lock();
3036 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3037}
3038
3039static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3040{
3041 struct ip6_sf_list *psf;
3042 if (v == SEQ_START_TOKEN)
3043 psf = igmp6_mcf_get_first(seq);
3044 else
3045 psf = igmp6_mcf_get_next(seq, v);
3046 ++*pos;
3047 return psf;
3048}
3049
3050static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
3051 __releases(RCU)
3052{
3053 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3054
3055 if (likely(state->im))
3056 state->im = NULL;
3057 if (likely(state->idev))
3058 state->idev = NULL;
3059
3060 state->dev = NULL;
3061 rcu_read_unlock();
3062}
3063
3064static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3065{
3066 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3067 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3068
3069 if (v == SEQ_START_TOKEN) {
3070 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
3071 } else {
3072 seq_printf(seq,
3073 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
3074 state->dev->ifindex, state->dev->name,
3075 &state->im->mca_addr,
3076 &psf->sf_addr,
3077 psf->sf_count[MCAST_INCLUDE],
3078 psf->sf_count[MCAST_EXCLUDE]);
3079 }
3080 return 0;
3081}
3082
3083static const struct seq_operations igmp6_mcf_seq_ops = {
3084 .start = igmp6_mcf_seq_start,
3085 .next = igmp6_mcf_seq_next,
3086 .stop = igmp6_mcf_seq_stop,
3087 .show = igmp6_mcf_seq_show,
3088};
3089
3090static int __net_init igmp6_proc_init(struct net *net)
3091{
3092 int err;
3093
3094 err = -ENOMEM;
3095 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3096 sizeof(struct igmp6_mc_iter_state)))
3097 goto out;
3098 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3099 &igmp6_mcf_seq_ops,
3100 sizeof(struct igmp6_mcf_iter_state)))
3101 goto out_proc_net_igmp6;
3102
3103 err = 0;
3104out:
3105 return err;
3106
3107out_proc_net_igmp6:
3108 remove_proc_entry("igmp6", net->proc_net);
3109 goto out;
3110}
3111
3112static void __net_exit igmp6_proc_exit(struct net *net)
3113{
3114 remove_proc_entry("mcfilter6", net->proc_net);
3115 remove_proc_entry("igmp6", net->proc_net);
3116}
3117#else
3118static inline int igmp6_proc_init(struct net *net)
3119{
3120 return 0;
3121}
3122static inline void igmp6_proc_exit(struct net *net)
3123{
3124}
3125#endif
3126
3127static int __net_init igmp6_net_init(struct net *net)
3128{
3129 int err;
3130
3131 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3132 SOCK_RAW, IPPROTO_ICMPV6, net);
3133 if (err < 0) {
3134 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
3135 err);
3136 goto out;
3137 }
3138
3139 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
3140 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
3141
3142 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3143 SOCK_RAW, IPPROTO_ICMPV6, net);
3144 if (err < 0) {
3145 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3146 err);
3147 goto out_sock_create;
3148 }
3149
3150 err = igmp6_proc_init(net);
3151 if (err)
3152 goto out_sock_create_autojoin;
3153
3154 return 0;
3155
3156out_sock_create_autojoin:
3157 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3158out_sock_create:
3159 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3160out:
3161 return err;
3162}
3163
3164static void __net_exit igmp6_net_exit(struct net *net)
3165{
3166 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3167 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3168 igmp6_proc_exit(net);
3169}
3170
3171static struct pernet_operations igmp6_net_ops = {
3172 .init = igmp6_net_init,
3173 .exit = igmp6_net_exit,
3174};
3175
3176int __init igmp6_init(void)
3177{
3178 int err;
3179
3180 err = register_pernet_subsys(&igmp6_net_ops);
3181 if (err)
3182 return err;
3183
3184 mld_wq = create_workqueue("mld");
3185 if (!mld_wq) {
3186 unregister_pernet_subsys(&igmp6_net_ops);
3187 return -ENOMEM;
3188 }
3189
3190 return err;
3191}
3192
3193int __init igmp6_late_init(void)
3194{
3195 return register_netdevice_notifier(&igmp6_netdev_notifier);
3196}
3197
3198void igmp6_cleanup(void)
3199{
3200 unregister_pernet_subsys(&igmp6_net_ops);
3201 destroy_workqueue(mld_wq);
3202}
3203
3204void igmp6_late_cleanup(void)
3205{
3206 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3207}
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 <linux/pkt_sched.h>
48#include <net/mld.h>
49
50#include <linux/netfilter.h>
51#include <linux/netfilter_ipv6.h>
52
53#include <net/net_namespace.h>
54#include <net/sock.h>
55#include <net/snmp.h>
56
57#include <net/ipv6.h>
58#include <net/protocol.h>
59#include <net/if_inet6.h>
60#include <net/ndisc.h>
61#include <net/addrconf.h>
62#include <net/ip6_route.h>
63#include <net/inet_common.h>
64
65#include <net/ip6_checksum.h>
66
67/* Set to 3 to get tracing... */
68#define MCAST_DEBUG 2
69
70#if MCAST_DEBUG >= 3
71#define MDBG(x) printk x
72#else
73#define MDBG(x)
74#endif
75
76/* Ensure that we have struct in6_addr aligned on 32bit word. */
77static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
80 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
81};
82
83static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
84
85/* Big mc list lock for all the sockets */
86static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
87
88static void igmp6_join_group(struct ifmcaddr6 *ma);
89static void igmp6_leave_group(struct ifmcaddr6 *ma);
90static void igmp6_timer_handler(unsigned long data);
91
92static void mld_gq_timer_expire(unsigned long data);
93static void mld_ifc_timer_expire(unsigned long data);
94static void mld_ifc_event(struct inet6_dev *idev);
95static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
96static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
97static void mld_clear_delrec(struct inet6_dev *idev);
98static bool mld_in_v1_mode(const struct inet6_dev *idev);
99static int sf_setstate(struct ifmcaddr6 *pmc);
100static void sf_markstate(struct ifmcaddr6 *pmc);
101static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
102static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
103 int sfmode, int sfcount, const struct in6_addr *psfsrc,
104 int delta);
105static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
106 int sfmode, int sfcount, const struct in6_addr *psfsrc,
107 int delta);
108static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
109 struct inet6_dev *idev);
110
111#define MLD_QRV_DEFAULT 2
112/* RFC3810, 9.2. Query Interval */
113#define MLD_QI_DEFAULT (125 * HZ)
114/* RFC3810, 9.3. Query Response Interval */
115#define MLD_QRI_DEFAULT (10 * HZ)
116
117/* RFC3810, 8.1 Query Version Distinctions */
118#define MLD_V1_QUERY_LEN 24
119#define MLD_V2_QUERY_LEN_MIN 28
120
121#define IPV6_MLD_MAX_MSF 64
122
123int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
124
125/*
126 * socket join on multicast group
127 */
128
129#define for_each_pmc_rcu(np, pmc) \
130 for (pmc = rcu_dereference(np->ipv6_mc_list); \
131 pmc != NULL; \
132 pmc = rcu_dereference(pmc->next))
133
134static int unsolicited_report_interval(struct inet6_dev *idev)
135{
136 int iv;
137
138 if (mld_in_v1_mode(idev))
139 iv = idev->cnf.mldv1_unsolicited_report_interval;
140 else
141 iv = idev->cnf.mldv2_unsolicited_report_interval;
142
143 return iv > 0 ? iv : 1;
144}
145
146int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
147{
148 struct net_device *dev = NULL;
149 struct ipv6_mc_socklist *mc_lst;
150 struct ipv6_pinfo *np = inet6_sk(sk);
151 struct net *net = sock_net(sk);
152 int err;
153
154 if (!ipv6_addr_is_multicast(addr))
155 return -EINVAL;
156
157 rcu_read_lock();
158 for_each_pmc_rcu(np, mc_lst) {
159 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
160 ipv6_addr_equal(&mc_lst->addr, addr)) {
161 rcu_read_unlock();
162 return -EADDRINUSE;
163 }
164 }
165 rcu_read_unlock();
166
167 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
168
169 if (mc_lst == NULL)
170 return -ENOMEM;
171
172 mc_lst->next = NULL;
173 mc_lst->addr = *addr;
174
175 rcu_read_lock();
176 if (ifindex == 0) {
177 struct rt6_info *rt;
178 rt = rt6_lookup(net, addr, NULL, 0, 0);
179 if (rt) {
180 dev = rt->dst.dev;
181 ip6_rt_put(rt);
182 }
183 } else
184 dev = dev_get_by_index_rcu(net, ifindex);
185
186 if (dev == NULL) {
187 rcu_read_unlock();
188 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
189 return -ENODEV;
190 }
191
192 mc_lst->ifindex = dev->ifindex;
193 mc_lst->sfmode = MCAST_EXCLUDE;
194 rwlock_init(&mc_lst->sflock);
195 mc_lst->sflist = NULL;
196
197 /*
198 * now add/increase the group membership on the device
199 */
200
201 err = ipv6_dev_mc_inc(dev, addr);
202
203 if (err) {
204 rcu_read_unlock();
205 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
206 return err;
207 }
208
209 spin_lock(&ipv6_sk_mc_lock);
210 mc_lst->next = np->ipv6_mc_list;
211 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
212 spin_unlock(&ipv6_sk_mc_lock);
213
214 rcu_read_unlock();
215
216 return 0;
217}
218
219/*
220 * socket leave on multicast group
221 */
222int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
223{
224 struct ipv6_pinfo *np = inet6_sk(sk);
225 struct ipv6_mc_socklist *mc_lst;
226 struct ipv6_mc_socklist __rcu **lnk;
227 struct net *net = sock_net(sk);
228
229 if (!ipv6_addr_is_multicast(addr))
230 return -EINVAL;
231
232 spin_lock(&ipv6_sk_mc_lock);
233 for (lnk = &np->ipv6_mc_list;
234 (mc_lst = rcu_dereference_protected(*lnk,
235 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
236 lnk = &mc_lst->next) {
237 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
238 ipv6_addr_equal(&mc_lst->addr, addr)) {
239 struct net_device *dev;
240
241 *lnk = mc_lst->next;
242 spin_unlock(&ipv6_sk_mc_lock);
243
244 rcu_read_lock();
245 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
246 if (dev != NULL) {
247 struct inet6_dev *idev = __in6_dev_get(dev);
248
249 (void) ip6_mc_leave_src(sk, mc_lst, idev);
250 if (idev)
251 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
252 } else
253 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
254 rcu_read_unlock();
255 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
256 kfree_rcu(mc_lst, rcu);
257 return 0;
258 }
259 }
260 spin_unlock(&ipv6_sk_mc_lock);
261
262 return -EADDRNOTAVAIL;
263}
264
265/* called with rcu_read_lock() */
266static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
267 const struct in6_addr *group,
268 int ifindex)
269{
270 struct net_device *dev = NULL;
271 struct inet6_dev *idev = NULL;
272
273 if (ifindex == 0) {
274 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
275
276 if (rt) {
277 dev = rt->dst.dev;
278 ip6_rt_put(rt);
279 }
280 } else
281 dev = dev_get_by_index_rcu(net, ifindex);
282
283 if (!dev)
284 return NULL;
285 idev = __in6_dev_get(dev);
286 if (!idev)
287 return NULL;
288 read_lock_bh(&idev->lock);
289 if (idev->dead) {
290 read_unlock_bh(&idev->lock);
291 return NULL;
292 }
293 return idev;
294}
295
296void ipv6_sock_mc_close(struct sock *sk)
297{
298 struct ipv6_pinfo *np = inet6_sk(sk);
299 struct ipv6_mc_socklist *mc_lst;
300 struct net *net = sock_net(sk);
301
302 if (!rcu_access_pointer(np->ipv6_mc_list))
303 return;
304
305 spin_lock(&ipv6_sk_mc_lock);
306 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
307 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
308 struct net_device *dev;
309
310 np->ipv6_mc_list = mc_lst->next;
311 spin_unlock(&ipv6_sk_mc_lock);
312
313 rcu_read_lock();
314 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
315 if (dev) {
316 struct inet6_dev *idev = __in6_dev_get(dev);
317
318 (void) ip6_mc_leave_src(sk, mc_lst, idev);
319 if (idev)
320 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
321 } else
322 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
323 rcu_read_unlock();
324
325 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
326 kfree_rcu(mc_lst, rcu);
327
328 spin_lock(&ipv6_sk_mc_lock);
329 }
330 spin_unlock(&ipv6_sk_mc_lock);
331}
332
333int ip6_mc_source(int add, int omode, struct sock *sk,
334 struct group_source_req *pgsr)
335{
336 struct in6_addr *source, *group;
337 struct ipv6_mc_socklist *pmc;
338 struct inet6_dev *idev;
339 struct ipv6_pinfo *inet6 = inet6_sk(sk);
340 struct ip6_sf_socklist *psl;
341 struct net *net = sock_net(sk);
342 int i, j, rv;
343 int leavegroup = 0;
344 int pmclocked = 0;
345 int err;
346
347 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
348 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
349
350 if (!ipv6_addr_is_multicast(group))
351 return -EINVAL;
352
353 rcu_read_lock();
354 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
355 if (!idev) {
356 rcu_read_unlock();
357 return -ENODEV;
358 }
359
360 err = -EADDRNOTAVAIL;
361
362 for_each_pmc_rcu(inet6, pmc) {
363 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
364 continue;
365 if (ipv6_addr_equal(&pmc->addr, group))
366 break;
367 }
368 if (!pmc) { /* must have a prior join */
369 err = -EINVAL;
370 goto done;
371 }
372 /* if a source filter was set, must be the same mode as before */
373 if (pmc->sflist) {
374 if (pmc->sfmode != omode) {
375 err = -EINVAL;
376 goto done;
377 }
378 } else if (pmc->sfmode != omode) {
379 /* allow mode switches for empty-set filters */
380 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
381 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
382 pmc->sfmode = omode;
383 }
384
385 write_lock(&pmc->sflock);
386 pmclocked = 1;
387
388 psl = pmc->sflist;
389 if (!add) {
390 if (!psl)
391 goto done; /* err = -EADDRNOTAVAIL */
392 rv = !0;
393 for (i=0; i<psl->sl_count; i++) {
394 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
395 if (rv == 0)
396 break;
397 }
398 if (rv) /* source not found */
399 goto done; /* err = -EADDRNOTAVAIL */
400
401 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
402 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
403 leavegroup = 1;
404 goto done;
405 }
406
407 /* update the interface filter */
408 ip6_mc_del_src(idev, group, omode, 1, source, 1);
409
410 for (j=i+1; j<psl->sl_count; j++)
411 psl->sl_addr[j-1] = psl->sl_addr[j];
412 psl->sl_count--;
413 err = 0;
414 goto done;
415 }
416 /* else, add a new source to the filter */
417
418 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
419 err = -ENOBUFS;
420 goto done;
421 }
422 if (!psl || psl->sl_count == psl->sl_max) {
423 struct ip6_sf_socklist *newpsl;
424 int count = IP6_SFBLOCK;
425
426 if (psl)
427 count += psl->sl_max;
428 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
429 if (!newpsl) {
430 err = -ENOBUFS;
431 goto done;
432 }
433 newpsl->sl_max = count;
434 newpsl->sl_count = count - IP6_SFBLOCK;
435 if (psl) {
436 for (i=0; i<psl->sl_count; i++)
437 newpsl->sl_addr[i] = psl->sl_addr[i];
438 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
439 }
440 pmc->sflist = psl = newpsl;
441 }
442 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
443 for (i=0; i<psl->sl_count; i++) {
444 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
445 if (rv == 0) /* There is an error in the address. */
446 goto done;
447 }
448 for (j=psl->sl_count-1; j>=i; j--)
449 psl->sl_addr[j+1] = psl->sl_addr[j];
450 psl->sl_addr[i] = *source;
451 psl->sl_count++;
452 err = 0;
453 /* update the interface list */
454 ip6_mc_add_src(idev, group, omode, 1, source, 1);
455done:
456 if (pmclocked)
457 write_unlock(&pmc->sflock);
458 read_unlock_bh(&idev->lock);
459 rcu_read_unlock();
460 if (leavegroup)
461 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
462 return err;
463}
464
465int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
466{
467 const struct in6_addr *group;
468 struct ipv6_mc_socklist *pmc;
469 struct inet6_dev *idev;
470 struct ipv6_pinfo *inet6 = inet6_sk(sk);
471 struct ip6_sf_socklist *newpsl, *psl;
472 struct net *net = sock_net(sk);
473 int leavegroup = 0;
474 int i, err;
475
476 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
477
478 if (!ipv6_addr_is_multicast(group))
479 return -EINVAL;
480 if (gsf->gf_fmode != MCAST_INCLUDE &&
481 gsf->gf_fmode != MCAST_EXCLUDE)
482 return -EINVAL;
483
484 rcu_read_lock();
485 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
486
487 if (!idev) {
488 rcu_read_unlock();
489 return -ENODEV;
490 }
491
492 err = 0;
493
494 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
495 leavegroup = 1;
496 goto done;
497 }
498
499 for_each_pmc_rcu(inet6, pmc) {
500 if (pmc->ifindex != gsf->gf_interface)
501 continue;
502 if (ipv6_addr_equal(&pmc->addr, group))
503 break;
504 }
505 if (!pmc) { /* must have a prior join */
506 err = -EINVAL;
507 goto done;
508 }
509 if (gsf->gf_numsrc) {
510 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
511 GFP_ATOMIC);
512 if (!newpsl) {
513 err = -ENOBUFS;
514 goto done;
515 }
516 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
517 for (i=0; i<newpsl->sl_count; ++i) {
518 struct sockaddr_in6 *psin6;
519
520 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
521 newpsl->sl_addr[i] = psin6->sin6_addr;
522 }
523 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
524 newpsl->sl_count, newpsl->sl_addr, 0);
525 if (err) {
526 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
527 goto done;
528 }
529 } else {
530 newpsl = NULL;
531 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
532 }
533
534 write_lock(&pmc->sflock);
535 psl = pmc->sflist;
536 if (psl) {
537 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
538 psl->sl_count, psl->sl_addr, 0);
539 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
540 } else
541 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
542 pmc->sflist = newpsl;
543 pmc->sfmode = gsf->gf_fmode;
544 write_unlock(&pmc->sflock);
545 err = 0;
546done:
547 read_unlock_bh(&idev->lock);
548 rcu_read_unlock();
549 if (leavegroup)
550 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
551 return err;
552}
553
554int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
555 struct group_filter __user *optval, int __user *optlen)
556{
557 int err, i, count, copycount;
558 const struct in6_addr *group;
559 struct ipv6_mc_socklist *pmc;
560 struct inet6_dev *idev;
561 struct ipv6_pinfo *inet6 = inet6_sk(sk);
562 struct ip6_sf_socklist *psl;
563 struct net *net = sock_net(sk);
564
565 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
566
567 if (!ipv6_addr_is_multicast(group))
568 return -EINVAL;
569
570 rcu_read_lock();
571 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
572
573 if (!idev) {
574 rcu_read_unlock();
575 return -ENODEV;
576 }
577
578 err = -EADDRNOTAVAIL;
579 /*
580 * changes to the ipv6_mc_list require the socket lock and
581 * a read lock on ip6_sk_mc_lock. We have the socket lock,
582 * so reading the list is safe.
583 */
584
585 for_each_pmc_rcu(inet6, pmc) {
586 if (pmc->ifindex != gsf->gf_interface)
587 continue;
588 if (ipv6_addr_equal(group, &pmc->addr))
589 break;
590 }
591 if (!pmc) /* must have a prior join */
592 goto done;
593 gsf->gf_fmode = pmc->sfmode;
594 psl = pmc->sflist;
595 count = psl ? psl->sl_count : 0;
596 read_unlock_bh(&idev->lock);
597 rcu_read_unlock();
598
599 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
600 gsf->gf_numsrc = count;
601 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
602 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
603 return -EFAULT;
604 }
605 /* changes to psl require the socket lock, a read lock on
606 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
607 * have the socket lock, so reading here is safe.
608 */
609 for (i=0; i<copycount; i++) {
610 struct sockaddr_in6 *psin6;
611 struct sockaddr_storage ss;
612
613 psin6 = (struct sockaddr_in6 *)&ss;
614 memset(&ss, 0, sizeof(ss));
615 psin6->sin6_family = AF_INET6;
616 psin6->sin6_addr = psl->sl_addr[i];
617 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
618 return -EFAULT;
619 }
620 return 0;
621done:
622 read_unlock_bh(&idev->lock);
623 rcu_read_unlock();
624 return err;
625}
626
627bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
628 const struct in6_addr *src_addr)
629{
630 struct ipv6_pinfo *np = inet6_sk(sk);
631 struct ipv6_mc_socklist *mc;
632 struct ip6_sf_socklist *psl;
633 bool rv = true;
634
635 rcu_read_lock();
636 for_each_pmc_rcu(np, mc) {
637 if (ipv6_addr_equal(&mc->addr, mc_addr))
638 break;
639 }
640 if (!mc) {
641 rcu_read_unlock();
642 return true;
643 }
644 read_lock(&mc->sflock);
645 psl = mc->sflist;
646 if (!psl) {
647 rv = mc->sfmode == MCAST_EXCLUDE;
648 } else {
649 int i;
650
651 for (i=0; i<psl->sl_count; i++) {
652 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
653 break;
654 }
655 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
656 rv = false;
657 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
658 rv = false;
659 }
660 read_unlock(&mc->sflock);
661 rcu_read_unlock();
662
663 return rv;
664}
665
666static void ma_put(struct ifmcaddr6 *mc)
667{
668 if (atomic_dec_and_test(&mc->mca_refcnt)) {
669 in6_dev_put(mc->idev);
670 kfree(mc);
671 }
672}
673
674static void igmp6_group_added(struct ifmcaddr6 *mc)
675{
676 struct net_device *dev = mc->idev->dev;
677 char buf[MAX_ADDR_LEN];
678
679 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
680 IPV6_ADDR_SCOPE_LINKLOCAL)
681 return;
682
683 spin_lock_bh(&mc->mca_lock);
684 if (!(mc->mca_flags&MAF_LOADED)) {
685 mc->mca_flags |= MAF_LOADED;
686 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
687 dev_mc_add(dev, buf);
688 }
689 spin_unlock_bh(&mc->mca_lock);
690
691 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
692 return;
693
694 if (mld_in_v1_mode(mc->idev)) {
695 igmp6_join_group(mc);
696 return;
697 }
698 /* else v2 */
699
700 mc->mca_crcount = mc->idev->mc_qrv;
701 mld_ifc_event(mc->idev);
702}
703
704static void igmp6_group_dropped(struct ifmcaddr6 *mc)
705{
706 struct net_device *dev = mc->idev->dev;
707 char buf[MAX_ADDR_LEN];
708
709 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
710 IPV6_ADDR_SCOPE_LINKLOCAL)
711 return;
712
713 spin_lock_bh(&mc->mca_lock);
714 if (mc->mca_flags&MAF_LOADED) {
715 mc->mca_flags &= ~MAF_LOADED;
716 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
717 dev_mc_del(dev, buf);
718 }
719
720 if (mc->mca_flags & MAF_NOREPORT)
721 goto done;
722 spin_unlock_bh(&mc->mca_lock);
723
724 if (!mc->idev->dead)
725 igmp6_leave_group(mc);
726
727 spin_lock_bh(&mc->mca_lock);
728 if (del_timer(&mc->mca_timer))
729 atomic_dec(&mc->mca_refcnt);
730done:
731 ip6_mc_clear_src(mc);
732 spin_unlock_bh(&mc->mca_lock);
733}
734
735/*
736 * deleted ifmcaddr6 manipulation
737 */
738static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
739{
740 struct ifmcaddr6 *pmc;
741
742 /* this is an "ifmcaddr6" for convenience; only the fields below
743 * are actually used. In particular, the refcnt and users are not
744 * used for management of the delete list. Using the same structure
745 * for deleted items allows change reports to use common code with
746 * non-deleted or query-response MCA's.
747 */
748 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
749 if (!pmc)
750 return;
751
752 spin_lock_bh(&im->mca_lock);
753 spin_lock_init(&pmc->mca_lock);
754 pmc->idev = im->idev;
755 in6_dev_hold(idev);
756 pmc->mca_addr = im->mca_addr;
757 pmc->mca_crcount = idev->mc_qrv;
758 pmc->mca_sfmode = im->mca_sfmode;
759 if (pmc->mca_sfmode == MCAST_INCLUDE) {
760 struct ip6_sf_list *psf;
761
762 pmc->mca_tomb = im->mca_tomb;
763 pmc->mca_sources = im->mca_sources;
764 im->mca_tomb = im->mca_sources = NULL;
765 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
766 psf->sf_crcount = pmc->mca_crcount;
767 }
768 spin_unlock_bh(&im->mca_lock);
769
770 spin_lock_bh(&idev->mc_lock);
771 pmc->next = idev->mc_tomb;
772 idev->mc_tomb = pmc;
773 spin_unlock_bh(&idev->mc_lock);
774}
775
776static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
777{
778 struct ifmcaddr6 *pmc, *pmc_prev;
779 struct ip6_sf_list *psf, *psf_next;
780
781 spin_lock_bh(&idev->mc_lock);
782 pmc_prev = NULL;
783 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
784 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
785 break;
786 pmc_prev = pmc;
787 }
788 if (pmc) {
789 if (pmc_prev)
790 pmc_prev->next = pmc->next;
791 else
792 idev->mc_tomb = pmc->next;
793 }
794 spin_unlock_bh(&idev->mc_lock);
795
796 if (pmc) {
797 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
798 psf_next = psf->sf_next;
799 kfree(psf);
800 }
801 in6_dev_put(pmc->idev);
802 kfree(pmc);
803 }
804}
805
806static void mld_clear_delrec(struct inet6_dev *idev)
807{
808 struct ifmcaddr6 *pmc, *nextpmc;
809
810 spin_lock_bh(&idev->mc_lock);
811 pmc = idev->mc_tomb;
812 idev->mc_tomb = NULL;
813 spin_unlock_bh(&idev->mc_lock);
814
815 for (; pmc; pmc = nextpmc) {
816 nextpmc = pmc->next;
817 ip6_mc_clear_src(pmc);
818 in6_dev_put(pmc->idev);
819 kfree(pmc);
820 }
821
822 /* clear dead sources, too */
823 read_lock_bh(&idev->lock);
824 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
825 struct ip6_sf_list *psf, *psf_next;
826
827 spin_lock_bh(&pmc->mca_lock);
828 psf = pmc->mca_tomb;
829 pmc->mca_tomb = NULL;
830 spin_unlock_bh(&pmc->mca_lock);
831 for (; psf; psf=psf_next) {
832 psf_next = psf->sf_next;
833 kfree(psf);
834 }
835 }
836 read_unlock_bh(&idev->lock);
837}
838
839
840/*
841 * device multicast group inc (add if not found)
842 */
843int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
844{
845 struct ifmcaddr6 *mc;
846 struct inet6_dev *idev;
847
848 /* we need to take a reference on idev */
849 idev = in6_dev_get(dev);
850
851 if (idev == NULL)
852 return -EINVAL;
853
854 write_lock_bh(&idev->lock);
855 if (idev->dead) {
856 write_unlock_bh(&idev->lock);
857 in6_dev_put(idev);
858 return -ENODEV;
859 }
860
861 for (mc = idev->mc_list; mc; mc = mc->next) {
862 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
863 mc->mca_users++;
864 write_unlock_bh(&idev->lock);
865 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
866 NULL, 0);
867 in6_dev_put(idev);
868 return 0;
869 }
870 }
871
872 /*
873 * not found: create a new one.
874 */
875
876 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
877
878 if (mc == NULL) {
879 write_unlock_bh(&idev->lock);
880 in6_dev_put(idev);
881 return -ENOMEM;
882 }
883
884 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
885
886 mc->mca_addr = *addr;
887 mc->idev = idev; /* (reference taken) */
888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 atomic_set(&mc->mca_refcnt, 2);
892 spin_lock_init(&mc->mca_lock);
893
894 /* initial mode is (EX, empty) */
895 mc->mca_sfmode = MCAST_EXCLUDE;
896 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
897
898 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
899 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
900 mc->mca_flags |= MAF_NOREPORT;
901
902 mc->next = idev->mc_list;
903 idev->mc_list = mc;
904 write_unlock_bh(&idev->lock);
905
906 mld_del_delrec(idev, &mc->mca_addr);
907 igmp6_group_added(mc);
908 ma_put(mc);
909 return 0;
910}
911
912/*
913 * device multicast group del
914 */
915int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
916{
917 struct ifmcaddr6 *ma, **map;
918
919 write_lock_bh(&idev->lock);
920 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
921 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
922 if (--ma->mca_users == 0) {
923 *map = ma->next;
924 write_unlock_bh(&idev->lock);
925
926 igmp6_group_dropped(ma);
927
928 ma_put(ma);
929 return 0;
930 }
931 write_unlock_bh(&idev->lock);
932 return 0;
933 }
934 }
935 write_unlock_bh(&idev->lock);
936
937 return -ENOENT;
938}
939
940int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
941{
942 struct inet6_dev *idev;
943 int err;
944
945 rcu_read_lock();
946
947 idev = __in6_dev_get(dev);
948 if (!idev)
949 err = -ENODEV;
950 else
951 err = __ipv6_dev_mc_dec(idev, addr);
952
953 rcu_read_unlock();
954 return err;
955}
956
957/*
958 * check if the interface/address pair is valid
959 */
960bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
961 const struct in6_addr *src_addr)
962{
963 struct inet6_dev *idev;
964 struct ifmcaddr6 *mc;
965 bool rv = false;
966
967 rcu_read_lock();
968 idev = __in6_dev_get(dev);
969 if (idev) {
970 read_lock_bh(&idev->lock);
971 for (mc = idev->mc_list; mc; mc=mc->next) {
972 if (ipv6_addr_equal(&mc->mca_addr, group))
973 break;
974 }
975 if (mc) {
976 if (src_addr && !ipv6_addr_any(src_addr)) {
977 struct ip6_sf_list *psf;
978
979 spin_lock_bh(&mc->mca_lock);
980 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
981 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
982 break;
983 }
984 if (psf)
985 rv = psf->sf_count[MCAST_INCLUDE] ||
986 psf->sf_count[MCAST_EXCLUDE] !=
987 mc->mca_sfcount[MCAST_EXCLUDE];
988 else
989 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
990 spin_unlock_bh(&mc->mca_lock);
991 } else
992 rv = true; /* don't filter unspecified source */
993 }
994 read_unlock_bh(&idev->lock);
995 }
996 rcu_read_unlock();
997 return rv;
998}
999
1000static void mld_gq_start_timer(struct inet6_dev *idev)
1001{
1002 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1003
1004 idev->mc_gq_running = 1;
1005 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1006 in6_dev_hold(idev);
1007}
1008
1009static void mld_gq_stop_timer(struct inet6_dev *idev)
1010{
1011 idev->mc_gq_running = 0;
1012 if (del_timer(&idev->mc_gq_timer))
1013 __in6_dev_put(idev);
1014}
1015
1016static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1017{
1018 unsigned long tv = prandom_u32() % delay;
1019
1020 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1021 in6_dev_hold(idev);
1022}
1023
1024static void mld_ifc_stop_timer(struct inet6_dev *idev)
1025{
1026 idev->mc_ifc_count = 0;
1027 if (del_timer(&idev->mc_ifc_timer))
1028 __in6_dev_put(idev);
1029}
1030
1031static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1032{
1033 unsigned long tv = prandom_u32() % delay;
1034
1035 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1036 in6_dev_hold(idev);
1037}
1038
1039static void mld_dad_stop_timer(struct inet6_dev *idev)
1040{
1041 if (del_timer(&idev->mc_dad_timer))
1042 __in6_dev_put(idev);
1043}
1044
1045/*
1046 * IGMP handling (alias multicast ICMPv6 messages)
1047 */
1048
1049static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1050{
1051 unsigned long delay = resptime;
1052
1053 /* Do not start timer for these addresses */
1054 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1055 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1056 return;
1057
1058 if (del_timer(&ma->mca_timer)) {
1059 atomic_dec(&ma->mca_refcnt);
1060 delay = ma->mca_timer.expires - jiffies;
1061 }
1062
1063 if (delay >= resptime)
1064 delay = prandom_u32() % resptime;
1065
1066 ma->mca_timer.expires = jiffies + delay;
1067 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1068 atomic_inc(&ma->mca_refcnt);
1069 ma->mca_flags |= MAF_TIMER_RUNNING;
1070}
1071
1072/* mark EXCLUDE-mode sources */
1073static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1074 const struct in6_addr *srcs)
1075{
1076 struct ip6_sf_list *psf;
1077 int i, scount;
1078
1079 scount = 0;
1080 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1081 if (scount == nsrcs)
1082 break;
1083 for (i=0; i<nsrcs; i++) {
1084 /* skip inactive filters */
1085 if (psf->sf_count[MCAST_INCLUDE] ||
1086 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1087 psf->sf_count[MCAST_EXCLUDE])
1088 break;
1089 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1090 scount++;
1091 break;
1092 }
1093 }
1094 }
1095 pmc->mca_flags &= ~MAF_GSQUERY;
1096 if (scount == nsrcs) /* all sources excluded */
1097 return false;
1098 return true;
1099}
1100
1101static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1102 const struct in6_addr *srcs)
1103{
1104 struct ip6_sf_list *psf;
1105 int i, scount;
1106
1107 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1108 return mld_xmarksources(pmc, nsrcs, srcs);
1109
1110 /* mark INCLUDE-mode sources */
1111
1112 scount = 0;
1113 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1114 if (scount == nsrcs)
1115 break;
1116 for (i=0; i<nsrcs; i++) {
1117 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1118 psf->sf_gsresp = 1;
1119 scount++;
1120 break;
1121 }
1122 }
1123 }
1124 if (!scount) {
1125 pmc->mca_flags &= ~MAF_GSQUERY;
1126 return false;
1127 }
1128 pmc->mca_flags |= MAF_GSQUERY;
1129 return true;
1130}
1131
1132static int mld_force_mld_version(const struct inet6_dev *idev)
1133{
1134 /* Normally, both are 0 here. If enforcement to a particular is
1135 * being used, individual device enforcement will have a lower
1136 * precedence over 'all' device (.../conf/all/force_mld_version).
1137 */
1138
1139 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1140 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1141 else
1142 return idev->cnf.force_mld_version;
1143}
1144
1145static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1146{
1147 return mld_force_mld_version(idev) == 2;
1148}
1149
1150static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1151{
1152 return mld_force_mld_version(idev) == 1;
1153}
1154
1155static bool mld_in_v1_mode(const struct inet6_dev *idev)
1156{
1157 if (mld_in_v2_mode_only(idev))
1158 return false;
1159 if (mld_in_v1_mode_only(idev))
1160 return true;
1161 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1162 return true;
1163
1164 return false;
1165}
1166
1167static void mld_set_v1_mode(struct inet6_dev *idev)
1168{
1169 /* RFC3810, relevant sections:
1170 * - 9.1. Robustness Variable
1171 * - 9.2. Query Interval
1172 * - 9.3. Query Response Interval
1173 * - 9.12. Older Version Querier Present Timeout
1174 */
1175 unsigned long switchback;
1176
1177 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1178
1179 idev->mc_v1_seen = jiffies + switchback;
1180}
1181
1182static void mld_update_qrv(struct inet6_dev *idev,
1183 const struct mld2_query *mlh2)
1184{
1185 /* RFC3810, relevant sections:
1186 * - 5.1.8. QRV (Querier's Robustness Variable)
1187 * - 9.1. Robustness Variable
1188 */
1189
1190 /* The value of the Robustness Variable MUST NOT be zero,
1191 * and SHOULD NOT be one. Catch this here if we ever run
1192 * into such a case in future.
1193 */
1194 WARN_ON(idev->mc_qrv == 0);
1195
1196 if (mlh2->mld2q_qrv > 0)
1197 idev->mc_qrv = mlh2->mld2q_qrv;
1198
1199 if (unlikely(idev->mc_qrv < 2)) {
1200 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1201 idev->mc_qrv, MLD_QRV_DEFAULT);
1202 idev->mc_qrv = MLD_QRV_DEFAULT;
1203 }
1204}
1205
1206static void mld_update_qi(struct inet6_dev *idev,
1207 const struct mld2_query *mlh2)
1208{
1209 /* RFC3810, relevant sections:
1210 * - 5.1.9. QQIC (Querier's Query Interval Code)
1211 * - 9.2. Query Interval
1212 * - 9.12. Older Version Querier Present Timeout
1213 * (the [Query Interval] in the last Query received)
1214 */
1215 unsigned long mc_qqi;
1216
1217 if (mlh2->mld2q_qqic < 128) {
1218 mc_qqi = mlh2->mld2q_qqic;
1219 } else {
1220 unsigned long mc_man, mc_exp;
1221
1222 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1223 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1224
1225 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1226 }
1227
1228 idev->mc_qi = mc_qqi * HZ;
1229}
1230
1231static void mld_update_qri(struct inet6_dev *idev,
1232 const struct mld2_query *mlh2)
1233{
1234 /* RFC3810, relevant sections:
1235 * - 5.1.3. Maximum Response Code
1236 * - 9.3. Query Response Interval
1237 */
1238 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1239}
1240
1241static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1242 unsigned long *max_delay)
1243{
1244 unsigned long mldv1_md;
1245
1246 /* Ignore v1 queries */
1247 if (mld_in_v2_mode_only(idev))
1248 return -EINVAL;
1249
1250 /* MLDv1 router present */
1251 mldv1_md = ntohs(mld->mld_maxdelay);
1252 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1253
1254 mld_set_v1_mode(idev);
1255
1256 /* cancel MLDv2 report timer */
1257 mld_gq_stop_timer(idev);
1258 /* cancel the interface change timer */
1259 mld_ifc_stop_timer(idev);
1260 /* clear deleted report items */
1261 mld_clear_delrec(idev);
1262
1263 return 0;
1264}
1265
1266static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1267 unsigned long *max_delay)
1268{
1269 /* hosts need to stay in MLDv1 mode, discard MLDv2 queries */
1270 if (mld_in_v1_mode(idev))
1271 return -EINVAL;
1272
1273 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1274
1275 mld_update_qrv(idev, mld);
1276 mld_update_qi(idev, mld);
1277 mld_update_qri(idev, mld);
1278
1279 idev->mc_maxdelay = *max_delay;
1280
1281 return 0;
1282}
1283
1284/* called with rcu_read_lock() */
1285int igmp6_event_query(struct sk_buff *skb)
1286{
1287 struct mld2_query *mlh2 = NULL;
1288 struct ifmcaddr6 *ma;
1289 const struct in6_addr *group;
1290 unsigned long max_delay;
1291 struct inet6_dev *idev;
1292 struct mld_msg *mld;
1293 int group_type;
1294 int mark = 0;
1295 int len, err;
1296
1297 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1298 return -EINVAL;
1299
1300 /* compute payload length excluding extension headers */
1301 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1302 len -= skb_network_header_len(skb);
1303
1304 /* Drop queries with not link local source */
1305 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1306 return -EINVAL;
1307
1308 idev = __in6_dev_get(skb->dev);
1309 if (idev == NULL)
1310 return 0;
1311
1312 mld = (struct mld_msg *)icmp6_hdr(skb);
1313 group = &mld->mld_mca;
1314 group_type = ipv6_addr_type(group);
1315
1316 if (group_type != IPV6_ADDR_ANY &&
1317 !(group_type&IPV6_ADDR_MULTICAST))
1318 return -EINVAL;
1319
1320 if (len == MLD_V1_QUERY_LEN) {
1321 err = mld_process_v1(idev, mld, &max_delay);
1322 if (err < 0)
1323 return err;
1324 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1325 int srcs_offset = sizeof(struct mld2_query) -
1326 sizeof(struct icmp6hdr);
1327
1328 if (!pskb_may_pull(skb, srcs_offset))
1329 return -EINVAL;
1330
1331 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1332
1333 err = mld_process_v2(idev, mlh2, &max_delay);
1334 if (err < 0)
1335 return err;
1336
1337 if (group_type == IPV6_ADDR_ANY) { /* general query */
1338 if (mlh2->mld2q_nsrcs)
1339 return -EINVAL; /* no sources allowed */
1340
1341 mld_gq_start_timer(idev);
1342 return 0;
1343 }
1344 /* mark sources to include, if group & source-specific */
1345 if (mlh2->mld2q_nsrcs != 0) {
1346 if (!pskb_may_pull(skb, srcs_offset +
1347 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1348 return -EINVAL;
1349
1350 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1351 mark = 1;
1352 }
1353 } else
1354 return -EINVAL;
1355
1356 read_lock_bh(&idev->lock);
1357 if (group_type == IPV6_ADDR_ANY) {
1358 for (ma = idev->mc_list; ma; ma=ma->next) {
1359 spin_lock_bh(&ma->mca_lock);
1360 igmp6_group_queried(ma, max_delay);
1361 spin_unlock_bh(&ma->mca_lock);
1362 }
1363 } else {
1364 for (ma = idev->mc_list; ma; ma=ma->next) {
1365 if (!ipv6_addr_equal(group, &ma->mca_addr))
1366 continue;
1367 spin_lock_bh(&ma->mca_lock);
1368 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1369 /* gsquery <- gsquery && mark */
1370 if (!mark)
1371 ma->mca_flags &= ~MAF_GSQUERY;
1372 } else {
1373 /* gsquery <- mark */
1374 if (mark)
1375 ma->mca_flags |= MAF_GSQUERY;
1376 else
1377 ma->mca_flags &= ~MAF_GSQUERY;
1378 }
1379 if (!(ma->mca_flags & MAF_GSQUERY) ||
1380 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1381 igmp6_group_queried(ma, max_delay);
1382 spin_unlock_bh(&ma->mca_lock);
1383 break;
1384 }
1385 }
1386 read_unlock_bh(&idev->lock);
1387
1388 return 0;
1389}
1390
1391/* called with rcu_read_lock() */
1392int igmp6_event_report(struct sk_buff *skb)
1393{
1394 struct ifmcaddr6 *ma;
1395 struct inet6_dev *idev;
1396 struct mld_msg *mld;
1397 int addr_type;
1398
1399 /* Our own report looped back. Ignore it. */
1400 if (skb->pkt_type == PACKET_LOOPBACK)
1401 return 0;
1402
1403 /* send our report if the MC router may not have heard this report */
1404 if (skb->pkt_type != PACKET_MULTICAST &&
1405 skb->pkt_type != PACKET_BROADCAST)
1406 return 0;
1407
1408 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1409 return -EINVAL;
1410
1411 mld = (struct mld_msg *)icmp6_hdr(skb);
1412
1413 /* Drop reports with not link local source */
1414 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1415 if (addr_type != IPV6_ADDR_ANY &&
1416 !(addr_type&IPV6_ADDR_LINKLOCAL))
1417 return -EINVAL;
1418
1419 idev = __in6_dev_get(skb->dev);
1420 if (idev == NULL)
1421 return -ENODEV;
1422
1423 /*
1424 * Cancel the timer for this group
1425 */
1426
1427 read_lock_bh(&idev->lock);
1428 for (ma = idev->mc_list; ma; ma=ma->next) {
1429 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1430 spin_lock(&ma->mca_lock);
1431 if (del_timer(&ma->mca_timer))
1432 atomic_dec(&ma->mca_refcnt);
1433 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1434 spin_unlock(&ma->mca_lock);
1435 break;
1436 }
1437 }
1438 read_unlock_bh(&idev->lock);
1439 return 0;
1440}
1441
1442static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1443 int gdeleted, int sdeleted)
1444{
1445 switch (type) {
1446 case MLD2_MODE_IS_INCLUDE:
1447 case MLD2_MODE_IS_EXCLUDE:
1448 if (gdeleted || sdeleted)
1449 return false;
1450 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1451 if (pmc->mca_sfmode == MCAST_INCLUDE)
1452 return true;
1453 /* don't include if this source is excluded
1454 * in all filters
1455 */
1456 if (psf->sf_count[MCAST_INCLUDE])
1457 return type == MLD2_MODE_IS_INCLUDE;
1458 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1459 psf->sf_count[MCAST_EXCLUDE];
1460 }
1461 return false;
1462 case MLD2_CHANGE_TO_INCLUDE:
1463 if (gdeleted || sdeleted)
1464 return false;
1465 return psf->sf_count[MCAST_INCLUDE] != 0;
1466 case MLD2_CHANGE_TO_EXCLUDE:
1467 if (gdeleted || sdeleted)
1468 return false;
1469 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1470 psf->sf_count[MCAST_INCLUDE])
1471 return false;
1472 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1473 psf->sf_count[MCAST_EXCLUDE];
1474 case MLD2_ALLOW_NEW_SOURCES:
1475 if (gdeleted || !psf->sf_crcount)
1476 return false;
1477 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1478 case MLD2_BLOCK_OLD_SOURCES:
1479 if (pmc->mca_sfmode == MCAST_INCLUDE)
1480 return gdeleted || (psf->sf_crcount && sdeleted);
1481 return psf->sf_crcount && !gdeleted && !sdeleted;
1482 }
1483 return false;
1484}
1485
1486static int
1487mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1488{
1489 struct ip6_sf_list *psf;
1490 int scount = 0;
1491
1492 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1493 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1494 continue;
1495 scount++;
1496 }
1497 return scount;
1498}
1499
1500static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1501 struct net_device *dev,
1502 const struct in6_addr *saddr,
1503 const struct in6_addr *daddr,
1504 int proto, int len)
1505{
1506 struct ipv6hdr *hdr;
1507
1508 skb->protocol = htons(ETH_P_IPV6);
1509 skb->dev = dev;
1510
1511 skb_reset_network_header(skb);
1512 skb_put(skb, sizeof(struct ipv6hdr));
1513 hdr = ipv6_hdr(skb);
1514
1515 ip6_flow_hdr(hdr, 0, 0);
1516
1517 hdr->payload_len = htons(len);
1518 hdr->nexthdr = proto;
1519 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1520
1521 hdr->saddr = *saddr;
1522 hdr->daddr = *daddr;
1523}
1524
1525static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1526{
1527 struct net_device *dev = idev->dev;
1528 struct net *net = dev_net(dev);
1529 struct sock *sk = net->ipv6.igmp_sk;
1530 struct sk_buff *skb;
1531 struct mld2_report *pmr;
1532 struct in6_addr addr_buf;
1533 const struct in6_addr *saddr;
1534 int hlen = LL_RESERVED_SPACE(dev);
1535 int tlen = dev->needed_tailroom;
1536 int err;
1537 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1538 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1539 IPV6_TLV_PADN, 0 };
1540
1541 /* we assume size > sizeof(ra) here */
1542 size += hlen + tlen;
1543 /* limit our allocations to order-0 page */
1544 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1545 skb = sock_alloc_send_skb(sk, size, 1, &err);
1546
1547 if (!skb)
1548 return NULL;
1549
1550 skb->priority = TC_PRIO_CONTROL;
1551 skb_reserve(skb, hlen);
1552
1553 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1554 /* <draft-ietf-magma-mld-source-05.txt>:
1555 * use unspecified address as the source address
1556 * when a valid link-local address is not available.
1557 */
1558 saddr = &in6addr_any;
1559 } else
1560 saddr = &addr_buf;
1561
1562 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1563
1564 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1565
1566 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1567 skb_put(skb, sizeof(*pmr));
1568 pmr = (struct mld2_report *)skb_transport_header(skb);
1569 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1570 pmr->mld2r_resv1 = 0;
1571 pmr->mld2r_cksum = 0;
1572 pmr->mld2r_resv2 = 0;
1573 pmr->mld2r_ngrec = 0;
1574 return skb;
1575}
1576
1577static void mld_sendpack(struct sk_buff *skb)
1578{
1579 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1580 struct mld2_report *pmr =
1581 (struct mld2_report *)skb_transport_header(skb);
1582 int payload_len, mldlen;
1583 struct inet6_dev *idev;
1584 struct net *net = dev_net(skb->dev);
1585 int err;
1586 struct flowi6 fl6;
1587 struct dst_entry *dst;
1588
1589 rcu_read_lock();
1590 idev = __in6_dev_get(skb->dev);
1591 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1592
1593 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1594 sizeof(*pip6);
1595 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1596 pip6->payload_len = htons(payload_len);
1597
1598 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1599 IPPROTO_ICMPV6,
1600 csum_partial(skb_transport_header(skb),
1601 mldlen, 0));
1602
1603 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1604 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1605 skb->dev->ifindex);
1606 dst = icmp6_dst_alloc(skb->dev, &fl6);
1607
1608 err = 0;
1609 if (IS_ERR(dst)) {
1610 err = PTR_ERR(dst);
1611 dst = NULL;
1612 }
1613 skb_dst_set(skb, dst);
1614 if (err)
1615 goto err_out;
1616
1617 payload_len = skb->len;
1618
1619 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1620 dst_output);
1621out:
1622 if (!err) {
1623 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1624 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1625 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1626 } else {
1627 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1628 }
1629
1630 rcu_read_unlock();
1631 return;
1632
1633err_out:
1634 kfree_skb(skb);
1635 goto out;
1636}
1637
1638static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1639{
1640 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1641}
1642
1643static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1644 int type, struct mld2_grec **ppgr)
1645{
1646 struct net_device *dev = pmc->idev->dev;
1647 struct mld2_report *pmr;
1648 struct mld2_grec *pgr;
1649
1650 if (!skb)
1651 skb = mld_newpack(pmc->idev, dev->mtu);
1652 if (!skb)
1653 return NULL;
1654 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1655 pgr->grec_type = type;
1656 pgr->grec_auxwords = 0;
1657 pgr->grec_nsrcs = 0;
1658 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1659 pmr = (struct mld2_report *)skb_transport_header(skb);
1660 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1661 *ppgr = pgr;
1662 return skb;
1663}
1664
1665#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1666 skb_tailroom(skb)) : 0)
1667
1668static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1669 int type, int gdeleted, int sdeleted, int crsend)
1670{
1671 struct inet6_dev *idev = pmc->idev;
1672 struct net_device *dev = idev->dev;
1673 struct mld2_report *pmr;
1674 struct mld2_grec *pgr = NULL;
1675 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1676 int scount, stotal, first, isquery, truncate;
1677
1678 if (pmc->mca_flags & MAF_NOREPORT)
1679 return skb;
1680
1681 isquery = type == MLD2_MODE_IS_INCLUDE ||
1682 type == MLD2_MODE_IS_EXCLUDE;
1683 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1684 type == MLD2_CHANGE_TO_EXCLUDE;
1685
1686 stotal = scount = 0;
1687
1688 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1689
1690 if (!*psf_list)
1691 goto empty_source;
1692
1693 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1694
1695 /* EX and TO_EX get a fresh packet, if needed */
1696 if (truncate) {
1697 if (pmr && pmr->mld2r_ngrec &&
1698 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1699 if (skb)
1700 mld_sendpack(skb);
1701 skb = mld_newpack(idev, dev->mtu);
1702 }
1703 }
1704 first = 1;
1705 psf_prev = NULL;
1706 for (psf=*psf_list; psf; psf=psf_next) {
1707 struct in6_addr *psrc;
1708
1709 psf_next = psf->sf_next;
1710
1711 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1712 psf_prev = psf;
1713 continue;
1714 }
1715
1716 /* clear marks on query responses */
1717 if (isquery)
1718 psf->sf_gsresp = 0;
1719
1720 if (AVAILABLE(skb) < sizeof(*psrc) +
1721 first*sizeof(struct mld2_grec)) {
1722 if (truncate && !first)
1723 break; /* truncate these */
1724 if (pgr)
1725 pgr->grec_nsrcs = htons(scount);
1726 if (skb)
1727 mld_sendpack(skb);
1728 skb = mld_newpack(idev, dev->mtu);
1729 first = 1;
1730 scount = 0;
1731 }
1732 if (first) {
1733 skb = add_grhead(skb, pmc, type, &pgr);
1734 first = 0;
1735 }
1736 if (!skb)
1737 return NULL;
1738 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1739 *psrc = psf->sf_addr;
1740 scount++; stotal++;
1741 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1742 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1743 psf->sf_crcount--;
1744 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1745 if (psf_prev)
1746 psf_prev->sf_next = psf->sf_next;
1747 else
1748 *psf_list = psf->sf_next;
1749 kfree(psf);
1750 continue;
1751 }
1752 }
1753 psf_prev = psf;
1754 }
1755
1756empty_source:
1757 if (!stotal) {
1758 if (type == MLD2_ALLOW_NEW_SOURCES ||
1759 type == MLD2_BLOCK_OLD_SOURCES)
1760 return skb;
1761 if (pmc->mca_crcount || isquery || crsend) {
1762 /* make sure we have room for group header */
1763 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1764 mld_sendpack(skb);
1765 skb = NULL; /* add_grhead will get a new one */
1766 }
1767 skb = add_grhead(skb, pmc, type, &pgr);
1768 }
1769 }
1770 if (pgr)
1771 pgr->grec_nsrcs = htons(scount);
1772
1773 if (isquery)
1774 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1775 return skb;
1776}
1777
1778static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1779{
1780 struct sk_buff *skb = NULL;
1781 int type;
1782
1783 read_lock_bh(&idev->lock);
1784 if (!pmc) {
1785 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1786 if (pmc->mca_flags & MAF_NOREPORT)
1787 continue;
1788 spin_lock_bh(&pmc->mca_lock);
1789 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1790 type = MLD2_MODE_IS_EXCLUDE;
1791 else
1792 type = MLD2_MODE_IS_INCLUDE;
1793 skb = add_grec(skb, pmc, type, 0, 0, 0);
1794 spin_unlock_bh(&pmc->mca_lock);
1795 }
1796 } else {
1797 spin_lock_bh(&pmc->mca_lock);
1798 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1799 type = MLD2_MODE_IS_EXCLUDE;
1800 else
1801 type = MLD2_MODE_IS_INCLUDE;
1802 skb = add_grec(skb, pmc, type, 0, 0, 0);
1803 spin_unlock_bh(&pmc->mca_lock);
1804 }
1805 read_unlock_bh(&idev->lock);
1806 if (skb)
1807 mld_sendpack(skb);
1808}
1809
1810/*
1811 * remove zero-count source records from a source filter list
1812 */
1813static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1814{
1815 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1816
1817 psf_prev = NULL;
1818 for (psf=*ppsf; psf; psf = psf_next) {
1819 psf_next = psf->sf_next;
1820 if (psf->sf_crcount == 0) {
1821 if (psf_prev)
1822 psf_prev->sf_next = psf->sf_next;
1823 else
1824 *ppsf = psf->sf_next;
1825 kfree(psf);
1826 } else
1827 psf_prev = psf;
1828 }
1829}
1830
1831static void mld_send_cr(struct inet6_dev *idev)
1832{
1833 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1834 struct sk_buff *skb = NULL;
1835 int type, dtype;
1836
1837 read_lock_bh(&idev->lock);
1838 spin_lock(&idev->mc_lock);
1839
1840 /* deleted MCA's */
1841 pmc_prev = NULL;
1842 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1843 pmc_next = pmc->next;
1844 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1845 type = MLD2_BLOCK_OLD_SOURCES;
1846 dtype = MLD2_BLOCK_OLD_SOURCES;
1847 skb = add_grec(skb, pmc, type, 1, 0, 0);
1848 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1849 }
1850 if (pmc->mca_crcount) {
1851 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1852 type = MLD2_CHANGE_TO_INCLUDE;
1853 skb = add_grec(skb, pmc, type, 1, 0, 0);
1854 }
1855 pmc->mca_crcount--;
1856 if (pmc->mca_crcount == 0) {
1857 mld_clear_zeros(&pmc->mca_tomb);
1858 mld_clear_zeros(&pmc->mca_sources);
1859 }
1860 }
1861 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1862 !pmc->mca_sources) {
1863 if (pmc_prev)
1864 pmc_prev->next = pmc_next;
1865 else
1866 idev->mc_tomb = pmc_next;
1867 in6_dev_put(pmc->idev);
1868 kfree(pmc);
1869 } else
1870 pmc_prev = pmc;
1871 }
1872 spin_unlock(&idev->mc_lock);
1873
1874 /* change recs */
1875 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1876 spin_lock_bh(&pmc->mca_lock);
1877 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1878 type = MLD2_BLOCK_OLD_SOURCES;
1879 dtype = MLD2_ALLOW_NEW_SOURCES;
1880 } else {
1881 type = MLD2_ALLOW_NEW_SOURCES;
1882 dtype = MLD2_BLOCK_OLD_SOURCES;
1883 }
1884 skb = add_grec(skb, pmc, type, 0, 0, 0);
1885 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1886
1887 /* filter mode changes */
1888 if (pmc->mca_crcount) {
1889 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1890 type = MLD2_CHANGE_TO_EXCLUDE;
1891 else
1892 type = MLD2_CHANGE_TO_INCLUDE;
1893 skb = add_grec(skb, pmc, type, 0, 0, 0);
1894 pmc->mca_crcount--;
1895 }
1896 spin_unlock_bh(&pmc->mca_lock);
1897 }
1898 read_unlock_bh(&idev->lock);
1899 if (!skb)
1900 return;
1901 (void) mld_sendpack(skb);
1902}
1903
1904static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1905{
1906 struct net *net = dev_net(dev);
1907 struct sock *sk = net->ipv6.igmp_sk;
1908 struct inet6_dev *idev;
1909 struct sk_buff *skb;
1910 struct mld_msg *hdr;
1911 const struct in6_addr *snd_addr, *saddr;
1912 struct in6_addr addr_buf;
1913 int hlen = LL_RESERVED_SPACE(dev);
1914 int tlen = dev->needed_tailroom;
1915 int err, len, payload_len, full_len;
1916 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1917 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1918 IPV6_TLV_PADN, 0 };
1919 struct flowi6 fl6;
1920 struct dst_entry *dst;
1921
1922 if (type == ICMPV6_MGM_REDUCTION)
1923 snd_addr = &in6addr_linklocal_allrouters;
1924 else
1925 snd_addr = addr;
1926
1927 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1928 payload_len = len + sizeof(ra);
1929 full_len = sizeof(struct ipv6hdr) + payload_len;
1930
1931 rcu_read_lock();
1932 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1933 IPSTATS_MIB_OUT, full_len);
1934 rcu_read_unlock();
1935
1936 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1937
1938 if (skb == NULL) {
1939 rcu_read_lock();
1940 IP6_INC_STATS(net, __in6_dev_get(dev),
1941 IPSTATS_MIB_OUTDISCARDS);
1942 rcu_read_unlock();
1943 return;
1944 }
1945 skb->priority = TC_PRIO_CONTROL;
1946 skb_reserve(skb, hlen);
1947
1948 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1949 /* <draft-ietf-magma-mld-source-05.txt>:
1950 * use unspecified address as the source address
1951 * when a valid link-local address is not available.
1952 */
1953 saddr = &in6addr_any;
1954 } else
1955 saddr = &addr_buf;
1956
1957 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1958
1959 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1960
1961 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1962 memset(hdr, 0, sizeof(struct mld_msg));
1963 hdr->mld_type = type;
1964 hdr->mld_mca = *addr;
1965
1966 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1967 IPPROTO_ICMPV6,
1968 csum_partial(hdr, len, 0));
1969
1970 rcu_read_lock();
1971 idev = __in6_dev_get(skb->dev);
1972
1973 icmpv6_flow_init(sk, &fl6, type,
1974 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1975 skb->dev->ifindex);
1976 dst = icmp6_dst_alloc(skb->dev, &fl6);
1977 if (IS_ERR(dst)) {
1978 err = PTR_ERR(dst);
1979 goto err_out;
1980 }
1981
1982 skb_dst_set(skb, dst);
1983 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1984 dst_output);
1985out:
1986 if (!err) {
1987 ICMP6MSGOUT_INC_STATS(net, idev, type);
1988 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1989 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1990 } else
1991 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1992
1993 rcu_read_unlock();
1994 return;
1995
1996err_out:
1997 kfree_skb(skb);
1998 goto out;
1999}
2000
2001static void mld_send_initial_cr(struct inet6_dev *idev)
2002{
2003 struct sk_buff *skb;
2004 struct ifmcaddr6 *pmc;
2005 int type;
2006
2007 if (mld_in_v1_mode(idev))
2008 return;
2009
2010 skb = NULL;
2011 read_lock_bh(&idev->lock);
2012 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2013 spin_lock_bh(&pmc->mca_lock);
2014 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2015 type = MLD2_CHANGE_TO_EXCLUDE;
2016 else
2017 type = MLD2_CHANGE_TO_INCLUDE;
2018 skb = add_grec(skb, pmc, type, 0, 0, 1);
2019 spin_unlock_bh(&pmc->mca_lock);
2020 }
2021 read_unlock_bh(&idev->lock);
2022 if (skb)
2023 mld_sendpack(skb);
2024}
2025
2026void ipv6_mc_dad_complete(struct inet6_dev *idev)
2027{
2028 idev->mc_dad_count = idev->mc_qrv;
2029 if (idev->mc_dad_count) {
2030 mld_send_initial_cr(idev);
2031 idev->mc_dad_count--;
2032 if (idev->mc_dad_count)
2033 mld_dad_start_timer(idev, idev->mc_maxdelay);
2034 }
2035}
2036
2037static void mld_dad_timer_expire(unsigned long data)
2038{
2039 struct inet6_dev *idev = (struct inet6_dev *)data;
2040
2041 mld_send_initial_cr(idev);
2042 if (idev->mc_dad_count) {
2043 idev->mc_dad_count--;
2044 if (idev->mc_dad_count)
2045 mld_dad_start_timer(idev, idev->mc_maxdelay);
2046 }
2047 in6_dev_put(idev);
2048}
2049
2050static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2051 const struct in6_addr *psfsrc)
2052{
2053 struct ip6_sf_list *psf, *psf_prev;
2054 int rv = 0;
2055
2056 psf_prev = NULL;
2057 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2058 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2059 break;
2060 psf_prev = psf;
2061 }
2062 if (!psf || psf->sf_count[sfmode] == 0) {
2063 /* source filter not found, or count wrong => bug */
2064 return -ESRCH;
2065 }
2066 psf->sf_count[sfmode]--;
2067 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2068 struct inet6_dev *idev = pmc->idev;
2069
2070 /* no more filters for this source */
2071 if (psf_prev)
2072 psf_prev->sf_next = psf->sf_next;
2073 else
2074 pmc->mca_sources = psf->sf_next;
2075 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2076 !mld_in_v1_mode(idev)) {
2077 psf->sf_crcount = idev->mc_qrv;
2078 psf->sf_next = pmc->mca_tomb;
2079 pmc->mca_tomb = psf;
2080 rv = 1;
2081 } else
2082 kfree(psf);
2083 }
2084 return rv;
2085}
2086
2087static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2088 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2089 int delta)
2090{
2091 struct ifmcaddr6 *pmc;
2092 int changerec = 0;
2093 int i, err;
2094
2095 if (!idev)
2096 return -ENODEV;
2097 read_lock_bh(&idev->lock);
2098 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2099 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2100 break;
2101 }
2102 if (!pmc) {
2103 /* MCA not found?? bug */
2104 read_unlock_bh(&idev->lock);
2105 return -ESRCH;
2106 }
2107 spin_lock_bh(&pmc->mca_lock);
2108 sf_markstate(pmc);
2109 if (!delta) {
2110 if (!pmc->mca_sfcount[sfmode]) {
2111 spin_unlock_bh(&pmc->mca_lock);
2112 read_unlock_bh(&idev->lock);
2113 return -EINVAL;
2114 }
2115 pmc->mca_sfcount[sfmode]--;
2116 }
2117 err = 0;
2118 for (i=0; i<sfcount; i++) {
2119 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2120
2121 changerec |= rv > 0;
2122 if (!err && rv < 0)
2123 err = rv;
2124 }
2125 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2126 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2127 pmc->mca_sfcount[MCAST_INCLUDE]) {
2128 struct ip6_sf_list *psf;
2129
2130 /* filter mode change */
2131 pmc->mca_sfmode = MCAST_INCLUDE;
2132 pmc->mca_crcount = idev->mc_qrv;
2133 idev->mc_ifc_count = pmc->mca_crcount;
2134 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2135 psf->sf_crcount = 0;
2136 mld_ifc_event(pmc->idev);
2137 } else if (sf_setstate(pmc) || changerec)
2138 mld_ifc_event(pmc->idev);
2139 spin_unlock_bh(&pmc->mca_lock);
2140 read_unlock_bh(&idev->lock);
2141 return err;
2142}
2143
2144/*
2145 * Add multicast single-source filter to the interface list
2146 */
2147static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2148 const struct in6_addr *psfsrc)
2149{
2150 struct ip6_sf_list *psf, *psf_prev;
2151
2152 psf_prev = NULL;
2153 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2154 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2155 break;
2156 psf_prev = psf;
2157 }
2158 if (!psf) {
2159 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2160 if (!psf)
2161 return -ENOBUFS;
2162
2163 psf->sf_addr = *psfsrc;
2164 if (psf_prev) {
2165 psf_prev->sf_next = psf;
2166 } else
2167 pmc->mca_sources = psf;
2168 }
2169 psf->sf_count[sfmode]++;
2170 return 0;
2171}
2172
2173static void sf_markstate(struct ifmcaddr6 *pmc)
2174{
2175 struct ip6_sf_list *psf;
2176 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2177
2178 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2179 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2180 psf->sf_oldin = mca_xcount ==
2181 psf->sf_count[MCAST_EXCLUDE] &&
2182 !psf->sf_count[MCAST_INCLUDE];
2183 } else
2184 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2185}
2186
2187static int sf_setstate(struct ifmcaddr6 *pmc)
2188{
2189 struct ip6_sf_list *psf, *dpsf;
2190 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2191 int qrv = pmc->idev->mc_qrv;
2192 int new_in, rv;
2193
2194 rv = 0;
2195 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2196 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2197 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2198 !psf->sf_count[MCAST_INCLUDE];
2199 } else
2200 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2201 if (new_in) {
2202 if (!psf->sf_oldin) {
2203 struct ip6_sf_list *prev = NULL;
2204
2205 for (dpsf=pmc->mca_tomb; dpsf;
2206 dpsf=dpsf->sf_next) {
2207 if (ipv6_addr_equal(&dpsf->sf_addr,
2208 &psf->sf_addr))
2209 break;
2210 prev = dpsf;
2211 }
2212 if (dpsf) {
2213 if (prev)
2214 prev->sf_next = dpsf->sf_next;
2215 else
2216 pmc->mca_tomb = dpsf->sf_next;
2217 kfree(dpsf);
2218 }
2219 psf->sf_crcount = qrv;
2220 rv++;
2221 }
2222 } else if (psf->sf_oldin) {
2223 psf->sf_crcount = 0;
2224 /*
2225 * add or update "delete" records if an active filter
2226 * is now inactive
2227 */
2228 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2229 if (ipv6_addr_equal(&dpsf->sf_addr,
2230 &psf->sf_addr))
2231 break;
2232 if (!dpsf) {
2233 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2234 if (!dpsf)
2235 continue;
2236 *dpsf = *psf;
2237 /* pmc->mca_lock held by callers */
2238 dpsf->sf_next = pmc->mca_tomb;
2239 pmc->mca_tomb = dpsf;
2240 }
2241 dpsf->sf_crcount = qrv;
2242 rv++;
2243 }
2244 }
2245 return rv;
2246}
2247
2248/*
2249 * Add multicast source filter list to the interface list
2250 */
2251static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2252 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2253 int delta)
2254{
2255 struct ifmcaddr6 *pmc;
2256 int isexclude;
2257 int i, err;
2258
2259 if (!idev)
2260 return -ENODEV;
2261 read_lock_bh(&idev->lock);
2262 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2263 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2264 break;
2265 }
2266 if (!pmc) {
2267 /* MCA not found?? bug */
2268 read_unlock_bh(&idev->lock);
2269 return -ESRCH;
2270 }
2271 spin_lock_bh(&pmc->mca_lock);
2272
2273 sf_markstate(pmc);
2274 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2275 if (!delta)
2276 pmc->mca_sfcount[sfmode]++;
2277 err = 0;
2278 for (i=0; i<sfcount; i++) {
2279 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2280 if (err)
2281 break;
2282 }
2283 if (err) {
2284 int j;
2285
2286 if (!delta)
2287 pmc->mca_sfcount[sfmode]--;
2288 for (j=0; j<i; j++)
2289 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2290 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2291 struct ip6_sf_list *psf;
2292
2293 /* filter mode change */
2294 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2295 pmc->mca_sfmode = MCAST_EXCLUDE;
2296 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2297 pmc->mca_sfmode = MCAST_INCLUDE;
2298 /* else no filters; keep old mode for reports */
2299
2300 pmc->mca_crcount = idev->mc_qrv;
2301 idev->mc_ifc_count = pmc->mca_crcount;
2302 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2303 psf->sf_crcount = 0;
2304 mld_ifc_event(idev);
2305 } else if (sf_setstate(pmc))
2306 mld_ifc_event(idev);
2307 spin_unlock_bh(&pmc->mca_lock);
2308 read_unlock_bh(&idev->lock);
2309 return err;
2310}
2311
2312static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2313{
2314 struct ip6_sf_list *psf, *nextpsf;
2315
2316 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2317 nextpsf = psf->sf_next;
2318 kfree(psf);
2319 }
2320 pmc->mca_tomb = NULL;
2321 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2322 nextpsf = psf->sf_next;
2323 kfree(psf);
2324 }
2325 pmc->mca_sources = NULL;
2326 pmc->mca_sfmode = MCAST_EXCLUDE;
2327 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2328 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2329}
2330
2331
2332static void igmp6_join_group(struct ifmcaddr6 *ma)
2333{
2334 unsigned long delay;
2335
2336 if (ma->mca_flags & MAF_NOREPORT)
2337 return;
2338
2339 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2340
2341 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2342
2343 spin_lock_bh(&ma->mca_lock);
2344 if (del_timer(&ma->mca_timer)) {
2345 atomic_dec(&ma->mca_refcnt);
2346 delay = ma->mca_timer.expires - jiffies;
2347 }
2348
2349 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2350 atomic_inc(&ma->mca_refcnt);
2351 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2352 spin_unlock_bh(&ma->mca_lock);
2353}
2354
2355static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2356 struct inet6_dev *idev)
2357{
2358 int err;
2359
2360 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2361 * so no other readers or writers of iml or its sflist
2362 */
2363 if (!iml->sflist) {
2364 /* any-source empty exclude case */
2365 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2366 }
2367 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2368 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2369 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2370 iml->sflist = NULL;
2371 return err;
2372}
2373
2374static void igmp6_leave_group(struct ifmcaddr6 *ma)
2375{
2376 if (mld_in_v1_mode(ma->idev)) {
2377 if (ma->mca_flags & MAF_LAST_REPORTER)
2378 igmp6_send(&ma->mca_addr, ma->idev->dev,
2379 ICMPV6_MGM_REDUCTION);
2380 } else {
2381 mld_add_delrec(ma->idev, ma);
2382 mld_ifc_event(ma->idev);
2383 }
2384}
2385
2386static void mld_gq_timer_expire(unsigned long data)
2387{
2388 struct inet6_dev *idev = (struct inet6_dev *)data;
2389
2390 idev->mc_gq_running = 0;
2391 mld_send_report(idev, NULL);
2392 in6_dev_put(idev);
2393}
2394
2395static void mld_ifc_timer_expire(unsigned long data)
2396{
2397 struct inet6_dev *idev = (struct inet6_dev *)data;
2398
2399 mld_send_cr(idev);
2400 if (idev->mc_ifc_count) {
2401 idev->mc_ifc_count--;
2402 if (idev->mc_ifc_count)
2403 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2404 }
2405 in6_dev_put(idev);
2406}
2407
2408static void mld_ifc_event(struct inet6_dev *idev)
2409{
2410 if (mld_in_v1_mode(idev))
2411 return;
2412 idev->mc_ifc_count = idev->mc_qrv;
2413 mld_ifc_start_timer(idev, 1);
2414}
2415
2416
2417static void igmp6_timer_handler(unsigned long data)
2418{
2419 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2420
2421 if (mld_in_v1_mode(ma->idev))
2422 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2423 else
2424 mld_send_report(ma->idev, ma);
2425
2426 spin_lock(&ma->mca_lock);
2427 ma->mca_flags |= MAF_LAST_REPORTER;
2428 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2429 spin_unlock(&ma->mca_lock);
2430 ma_put(ma);
2431}
2432
2433/* Device changing type */
2434
2435void ipv6_mc_unmap(struct inet6_dev *idev)
2436{
2437 struct ifmcaddr6 *i;
2438
2439 /* Install multicast list, except for all-nodes (already installed) */
2440
2441 read_lock_bh(&idev->lock);
2442 for (i = idev->mc_list; i; i = i->next)
2443 igmp6_group_dropped(i);
2444 read_unlock_bh(&idev->lock);
2445}
2446
2447void ipv6_mc_remap(struct inet6_dev *idev)
2448{
2449 ipv6_mc_up(idev);
2450}
2451
2452/* Device going down */
2453
2454void ipv6_mc_down(struct inet6_dev *idev)
2455{
2456 struct ifmcaddr6 *i;
2457
2458 /* Withdraw multicast list */
2459
2460 read_lock_bh(&idev->lock);
2461 mld_ifc_stop_timer(idev);
2462 mld_gq_stop_timer(idev);
2463 mld_dad_stop_timer(idev);
2464
2465 for (i = idev->mc_list; i; i=i->next)
2466 igmp6_group_dropped(i);
2467 read_unlock_bh(&idev->lock);
2468
2469 mld_clear_delrec(idev);
2470}
2471
2472
2473/* Device going up */
2474
2475void ipv6_mc_up(struct inet6_dev *idev)
2476{
2477 struct ifmcaddr6 *i;
2478
2479 /* Install multicast list, except for all-nodes (already installed) */
2480
2481 read_lock_bh(&idev->lock);
2482 for (i = idev->mc_list; i; i=i->next)
2483 igmp6_group_added(i);
2484 read_unlock_bh(&idev->lock);
2485}
2486
2487/* IPv6 device initialization. */
2488
2489void ipv6_mc_init_dev(struct inet6_dev *idev)
2490{
2491 write_lock_bh(&idev->lock);
2492 spin_lock_init(&idev->mc_lock);
2493 idev->mc_gq_running = 0;
2494 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2495 (unsigned long)idev);
2496 idev->mc_tomb = NULL;
2497 idev->mc_ifc_count = 0;
2498 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2499 (unsigned long)idev);
2500 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2501 (unsigned long)idev);
2502
2503 idev->mc_qrv = MLD_QRV_DEFAULT;
2504 idev->mc_qi = MLD_QI_DEFAULT;
2505 idev->mc_qri = MLD_QRI_DEFAULT;
2506
2507 idev->mc_maxdelay = unsolicited_report_interval(idev);
2508 idev->mc_v1_seen = 0;
2509 write_unlock_bh(&idev->lock);
2510}
2511
2512/*
2513 * Device is about to be destroyed: clean up.
2514 */
2515
2516void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2517{
2518 struct ifmcaddr6 *i;
2519
2520 /* Deactivate timers */
2521 ipv6_mc_down(idev);
2522
2523 /* Delete all-nodes address. */
2524 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2525 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2526 * fail.
2527 */
2528 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2529
2530 if (idev->cnf.forwarding)
2531 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2532
2533 write_lock_bh(&idev->lock);
2534 while ((i = idev->mc_list) != NULL) {
2535 idev->mc_list = i->next;
2536 write_unlock_bh(&idev->lock);
2537
2538 igmp6_group_dropped(i);
2539 ma_put(i);
2540
2541 write_lock_bh(&idev->lock);
2542 }
2543 write_unlock_bh(&idev->lock);
2544}
2545
2546#ifdef CONFIG_PROC_FS
2547struct igmp6_mc_iter_state {
2548 struct seq_net_private p;
2549 struct net_device *dev;
2550 struct inet6_dev *idev;
2551};
2552
2553#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2554
2555static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2556{
2557 struct ifmcaddr6 *im = NULL;
2558 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2559 struct net *net = seq_file_net(seq);
2560
2561 state->idev = NULL;
2562 for_each_netdev_rcu(net, state->dev) {
2563 struct inet6_dev *idev;
2564 idev = __in6_dev_get(state->dev);
2565 if (!idev)
2566 continue;
2567 read_lock_bh(&idev->lock);
2568 im = idev->mc_list;
2569 if (im) {
2570 state->idev = idev;
2571 break;
2572 }
2573 read_unlock_bh(&idev->lock);
2574 }
2575 return im;
2576}
2577
2578static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2579{
2580 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2581
2582 im = im->next;
2583 while (!im) {
2584 if (likely(state->idev != NULL))
2585 read_unlock_bh(&state->idev->lock);
2586
2587 state->dev = next_net_device_rcu(state->dev);
2588 if (!state->dev) {
2589 state->idev = NULL;
2590 break;
2591 }
2592 state->idev = __in6_dev_get(state->dev);
2593 if (!state->idev)
2594 continue;
2595 read_lock_bh(&state->idev->lock);
2596 im = state->idev->mc_list;
2597 }
2598 return im;
2599}
2600
2601static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2602{
2603 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2604 if (im)
2605 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2606 --pos;
2607 return pos ? NULL : im;
2608}
2609
2610static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2611 __acquires(RCU)
2612{
2613 rcu_read_lock();
2614 return igmp6_mc_get_idx(seq, *pos);
2615}
2616
2617static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2618{
2619 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2620
2621 ++*pos;
2622 return im;
2623}
2624
2625static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2626 __releases(RCU)
2627{
2628 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2629
2630 if (likely(state->idev != NULL)) {
2631 read_unlock_bh(&state->idev->lock);
2632 state->idev = NULL;
2633 }
2634 state->dev = NULL;
2635 rcu_read_unlock();
2636}
2637
2638static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2639{
2640 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2641 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2642
2643 seq_printf(seq,
2644 "%-4d %-15s %pi6 %5d %08X %ld\n",
2645 state->dev->ifindex, state->dev->name,
2646 &im->mca_addr,
2647 im->mca_users, im->mca_flags,
2648 (im->mca_flags&MAF_TIMER_RUNNING) ?
2649 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2650 return 0;
2651}
2652
2653static const struct seq_operations igmp6_mc_seq_ops = {
2654 .start = igmp6_mc_seq_start,
2655 .next = igmp6_mc_seq_next,
2656 .stop = igmp6_mc_seq_stop,
2657 .show = igmp6_mc_seq_show,
2658};
2659
2660static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2661{
2662 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2663 sizeof(struct igmp6_mc_iter_state));
2664}
2665
2666static const struct file_operations igmp6_mc_seq_fops = {
2667 .owner = THIS_MODULE,
2668 .open = igmp6_mc_seq_open,
2669 .read = seq_read,
2670 .llseek = seq_lseek,
2671 .release = seq_release_net,
2672};
2673
2674struct igmp6_mcf_iter_state {
2675 struct seq_net_private p;
2676 struct net_device *dev;
2677 struct inet6_dev *idev;
2678 struct ifmcaddr6 *im;
2679};
2680
2681#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2682
2683static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2684{
2685 struct ip6_sf_list *psf = NULL;
2686 struct ifmcaddr6 *im = NULL;
2687 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2688 struct net *net = seq_file_net(seq);
2689
2690 state->idev = NULL;
2691 state->im = NULL;
2692 for_each_netdev_rcu(net, state->dev) {
2693 struct inet6_dev *idev;
2694 idev = __in6_dev_get(state->dev);
2695 if (unlikely(idev == NULL))
2696 continue;
2697 read_lock_bh(&idev->lock);
2698 im = idev->mc_list;
2699 if (likely(im != NULL)) {
2700 spin_lock_bh(&im->mca_lock);
2701 psf = im->mca_sources;
2702 if (likely(psf != NULL)) {
2703 state->im = im;
2704 state->idev = idev;
2705 break;
2706 }
2707 spin_unlock_bh(&im->mca_lock);
2708 }
2709 read_unlock_bh(&idev->lock);
2710 }
2711 return psf;
2712}
2713
2714static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2715{
2716 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2717
2718 psf = psf->sf_next;
2719 while (!psf) {
2720 spin_unlock_bh(&state->im->mca_lock);
2721 state->im = state->im->next;
2722 while (!state->im) {
2723 if (likely(state->idev != NULL))
2724 read_unlock_bh(&state->idev->lock);
2725
2726 state->dev = next_net_device_rcu(state->dev);
2727 if (!state->dev) {
2728 state->idev = NULL;
2729 goto out;
2730 }
2731 state->idev = __in6_dev_get(state->dev);
2732 if (!state->idev)
2733 continue;
2734 read_lock_bh(&state->idev->lock);
2735 state->im = state->idev->mc_list;
2736 }
2737 if (!state->im)
2738 break;
2739 spin_lock_bh(&state->im->mca_lock);
2740 psf = state->im->mca_sources;
2741 }
2742out:
2743 return psf;
2744}
2745
2746static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2747{
2748 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2749 if (psf)
2750 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2751 --pos;
2752 return pos ? NULL : psf;
2753}
2754
2755static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2756 __acquires(RCU)
2757{
2758 rcu_read_lock();
2759 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2760}
2761
2762static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2763{
2764 struct ip6_sf_list *psf;
2765 if (v == SEQ_START_TOKEN)
2766 psf = igmp6_mcf_get_first(seq);
2767 else
2768 psf = igmp6_mcf_get_next(seq, v);
2769 ++*pos;
2770 return psf;
2771}
2772
2773static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2774 __releases(RCU)
2775{
2776 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2777 if (likely(state->im != NULL)) {
2778 spin_unlock_bh(&state->im->mca_lock);
2779 state->im = NULL;
2780 }
2781 if (likely(state->idev != NULL)) {
2782 read_unlock_bh(&state->idev->lock);
2783 state->idev = NULL;
2784 }
2785 state->dev = NULL;
2786 rcu_read_unlock();
2787}
2788
2789static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2790{
2791 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2792 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2793
2794 if (v == SEQ_START_TOKEN) {
2795 seq_printf(seq,
2796 "%3s %6s "
2797 "%32s %32s %6s %6s\n", "Idx",
2798 "Device", "Multicast Address",
2799 "Source Address", "INC", "EXC");
2800 } else {
2801 seq_printf(seq,
2802 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2803 state->dev->ifindex, state->dev->name,
2804 &state->im->mca_addr,
2805 &psf->sf_addr,
2806 psf->sf_count[MCAST_INCLUDE],
2807 psf->sf_count[MCAST_EXCLUDE]);
2808 }
2809 return 0;
2810}
2811
2812static const struct seq_operations igmp6_mcf_seq_ops = {
2813 .start = igmp6_mcf_seq_start,
2814 .next = igmp6_mcf_seq_next,
2815 .stop = igmp6_mcf_seq_stop,
2816 .show = igmp6_mcf_seq_show,
2817};
2818
2819static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2820{
2821 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2822 sizeof(struct igmp6_mcf_iter_state));
2823}
2824
2825static const struct file_operations igmp6_mcf_seq_fops = {
2826 .owner = THIS_MODULE,
2827 .open = igmp6_mcf_seq_open,
2828 .read = seq_read,
2829 .llseek = seq_lseek,
2830 .release = seq_release_net,
2831};
2832
2833static int __net_init igmp6_proc_init(struct net *net)
2834{
2835 int err;
2836
2837 err = -ENOMEM;
2838 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2839 goto out;
2840 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2841 &igmp6_mcf_seq_fops))
2842 goto out_proc_net_igmp6;
2843
2844 err = 0;
2845out:
2846 return err;
2847
2848out_proc_net_igmp6:
2849 remove_proc_entry("igmp6", net->proc_net);
2850 goto out;
2851}
2852
2853static void __net_exit igmp6_proc_exit(struct net *net)
2854{
2855 remove_proc_entry("mcfilter6", net->proc_net);
2856 remove_proc_entry("igmp6", net->proc_net);
2857}
2858#else
2859static inline int igmp6_proc_init(struct net *net)
2860{
2861 return 0;
2862}
2863static inline void igmp6_proc_exit(struct net *net)
2864{
2865}
2866#endif
2867
2868static int __net_init igmp6_net_init(struct net *net)
2869{
2870 int err;
2871
2872 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2873 SOCK_RAW, IPPROTO_ICMPV6, net);
2874 if (err < 0) {
2875 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2876 err);
2877 goto out;
2878 }
2879
2880 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2881
2882 err = igmp6_proc_init(net);
2883 if (err)
2884 goto out_sock_create;
2885out:
2886 return err;
2887
2888out_sock_create:
2889 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2890 goto out;
2891}
2892
2893static void __net_exit igmp6_net_exit(struct net *net)
2894{
2895 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2896 igmp6_proc_exit(net);
2897}
2898
2899static struct pernet_operations igmp6_net_ops = {
2900 .init = igmp6_net_init,
2901 .exit = igmp6_net_exit,
2902};
2903
2904int __init igmp6_init(void)
2905{
2906 return register_pernet_subsys(&igmp6_net_ops);
2907}
2908
2909void igmp6_cleanup(void)
2910{
2911 unregister_pernet_subsys(&igmp6_net_ops);
2912}