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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, IP6_SFLSIZE(count), GFP_KERNEL);
451 if (!newpsl) {
452 err = -ENOBUFS;
453 goto done;
454 }
455 newpsl->sl_max = count;
456 newpsl->sl_count = count - IP6_SFBLOCK;
457 if (psl) {
458 for (i = 0; i < psl->sl_count; i++)
459 newpsl->sl_addr[i] = psl->sl_addr[i];
460 atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
461 kfree_rcu(psl, rcu);
462 }
463 psl = newpsl;
464 rcu_assign_pointer(pmc->sflist, psl);
465 }
466 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
467 for (i = 0; i < psl->sl_count; i++) {
468 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
469 if (rv == 0) /* There is an error in the address. */
470 goto done;
471 }
472 for (j = psl->sl_count-1; j >= i; j--)
473 psl->sl_addr[j+1] = psl->sl_addr[j];
474 psl->sl_addr[i] = *source;
475 psl->sl_count++;
476 err = 0;
477 /* update the interface list */
478 ip6_mc_add_src(idev, group, omode, 1, source, 1);
479done:
480 mutex_unlock(&idev->mc_lock);
481 if (leavegroup)
482 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
483 return err;
484}
485
486int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
487 struct sockaddr_storage *list)
488{
489 const struct in6_addr *group;
490 struct ipv6_mc_socklist *pmc;
491 struct inet6_dev *idev;
492 struct ipv6_pinfo *inet6 = inet6_sk(sk);
493 struct ip6_sf_socklist *newpsl, *psl;
494 struct net *net = sock_net(sk);
495 int leavegroup = 0;
496 int i, err;
497
498 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
499
500 if (!ipv6_addr_is_multicast(group))
501 return -EINVAL;
502 if (gsf->gf_fmode != MCAST_INCLUDE &&
503 gsf->gf_fmode != MCAST_EXCLUDE)
504 return -EINVAL;
505
506 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface);
507 if (!idev)
508 return -ENODEV;
509
510 err = 0;
511
512 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
513 leavegroup = 1;
514 goto done;
515 }
516
517 for_each_pmc_socklock(inet6, sk, pmc) {
518 if (pmc->ifindex != gsf->gf_interface)
519 continue;
520 if (ipv6_addr_equal(&pmc->addr, group))
521 break;
522 }
523 if (!pmc) { /* must have a prior join */
524 err = -EINVAL;
525 goto done;
526 }
527 if (gsf->gf_numsrc) {
528 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
529 GFP_KERNEL);
530 if (!newpsl) {
531 err = -ENOBUFS;
532 goto done;
533 }
534 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
535 for (i = 0; i < newpsl->sl_count; ++i, ++list) {
536 struct sockaddr_in6 *psin6;
537
538 psin6 = (struct sockaddr_in6 *)list;
539 newpsl->sl_addr[i] = psin6->sin6_addr;
540 }
541 mutex_lock(&idev->mc_lock);
542 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
543 newpsl->sl_count, newpsl->sl_addr, 0);
544 if (err) {
545 mutex_unlock(&idev->mc_lock);
546 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
547 goto done;
548 }
549 mutex_unlock(&idev->mc_lock);
550 } else {
551 newpsl = NULL;
552 mutex_lock(&idev->mc_lock);
553 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
554 mutex_unlock(&idev->mc_lock);
555 }
556
557 mutex_lock(&idev->mc_lock);
558 psl = sock_dereference(pmc->sflist, sk);
559 if (psl) {
560 ip6_mc_del_src(idev, group, pmc->sfmode,
561 psl->sl_count, psl->sl_addr, 0);
562 atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
563 kfree_rcu(psl, rcu);
564 } else {
565 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
566 }
567 mutex_unlock(&idev->mc_lock);
568 rcu_assign_pointer(pmc->sflist, newpsl);
569 pmc->sfmode = gsf->gf_fmode;
570 err = 0;
571done:
572 if (leavegroup)
573 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
574 return err;
575}
576
577int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
578 struct sockaddr_storage __user *p)
579{
580 struct ipv6_pinfo *inet6 = inet6_sk(sk);
581 const struct in6_addr *group;
582 struct ipv6_mc_socklist *pmc;
583 struct ip6_sf_socklist *psl;
584 int i, count, copycount;
585
586 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
587
588 if (!ipv6_addr_is_multicast(group))
589 return -EINVAL;
590
591 /* changes to the ipv6_mc_list require the socket lock and
592 * rtnl lock. We have the socket lock, so reading the list is safe.
593 */
594
595 for_each_pmc_socklock(inet6, sk, pmc) {
596 if (pmc->ifindex != gsf->gf_interface)
597 continue;
598 if (ipv6_addr_equal(group, &pmc->addr))
599 break;
600 }
601 if (!pmc) /* must have a prior join */
602 return -EADDRNOTAVAIL;
603
604 gsf->gf_fmode = pmc->sfmode;
605 psl = sock_dereference(pmc->sflist, sk);
606 count = psl ? psl->sl_count : 0;
607
608 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
609 gsf->gf_numsrc = count;
610
611 for (i = 0; i < copycount; i++, p++) {
612 struct sockaddr_in6 *psin6;
613 struct sockaddr_storage ss;
614
615 psin6 = (struct sockaddr_in6 *)&ss;
616 memset(&ss, 0, sizeof(ss));
617 psin6->sin6_family = AF_INET6;
618 psin6->sin6_addr = psl->sl_addr[i];
619 if (copy_to_user(p, &ss, sizeof(ss)))
620 return -EFAULT;
621 }
622 return 0;
623}
624
625bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
626 const struct in6_addr *src_addr)
627{
628 struct ipv6_pinfo *np = inet6_sk(sk);
629 struct ipv6_mc_socklist *mc;
630 struct ip6_sf_socklist *psl;
631 bool rv = true;
632
633 rcu_read_lock();
634 for_each_pmc_rcu(np, mc) {
635 if (ipv6_addr_equal(&mc->addr, mc_addr))
636 break;
637 }
638 if (!mc) {
639 rcu_read_unlock();
640 return np->mc_all;
641 }
642 psl = rcu_dereference(mc->sflist);
643 if (!psl) {
644 rv = mc->sfmode == MCAST_EXCLUDE;
645 } else {
646 int i;
647
648 for (i = 0; i < psl->sl_count; i++) {
649 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
650 break;
651 }
652 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
653 rv = false;
654 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
655 rv = false;
656 }
657 rcu_read_unlock();
658
659 return rv;
660}
661
662/* called with mc_lock */
663static void igmp6_group_added(struct ifmcaddr6 *mc)
664{
665 struct net_device *dev = mc->idev->dev;
666 char buf[MAX_ADDR_LEN];
667
668 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
669 IPV6_ADDR_SCOPE_LINKLOCAL)
670 return;
671
672 if (!(mc->mca_flags&MAF_LOADED)) {
673 mc->mca_flags |= MAF_LOADED;
674 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
675 dev_mc_add(dev, buf);
676 }
677
678 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
679 return;
680
681 if (mld_in_v1_mode(mc->idev)) {
682 igmp6_join_group(mc);
683 return;
684 }
685 /* else v2 */
686
687 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
688 * should not send filter-mode change record as the mode
689 * should be from IN() to IN(A).
690 */
691 if (mc->mca_sfmode == MCAST_EXCLUDE)
692 mc->mca_crcount = mc->idev->mc_qrv;
693
694 mld_ifc_event(mc->idev);
695}
696
697/* called with mc_lock */
698static void igmp6_group_dropped(struct ifmcaddr6 *mc)
699{
700 struct net_device *dev = mc->idev->dev;
701 char buf[MAX_ADDR_LEN];
702
703 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
704 IPV6_ADDR_SCOPE_LINKLOCAL)
705 return;
706
707 if (mc->mca_flags&MAF_LOADED) {
708 mc->mca_flags &= ~MAF_LOADED;
709 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
710 dev_mc_del(dev, buf);
711 }
712
713 if (mc->mca_flags & MAF_NOREPORT)
714 return;
715
716 if (!mc->idev->dead)
717 igmp6_leave_group(mc);
718
719 if (cancel_delayed_work(&mc->mca_work))
720 refcount_dec(&mc->mca_refcnt);
721}
722
723/*
724 * deleted ifmcaddr6 manipulation
725 * called with mc_lock
726 */
727static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
728{
729 struct ifmcaddr6 *pmc;
730
731 /* this is an "ifmcaddr6" for convenience; only the fields below
732 * are actually used. In particular, the refcnt and users are not
733 * used for management of the delete list. Using the same structure
734 * for deleted items allows change reports to use common code with
735 * non-deleted or query-response MCA's.
736 */
737 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
738 if (!pmc)
739 return;
740
741 pmc->idev = im->idev;
742 in6_dev_hold(idev);
743 pmc->mca_addr = im->mca_addr;
744 pmc->mca_crcount = idev->mc_qrv;
745 pmc->mca_sfmode = im->mca_sfmode;
746 if (pmc->mca_sfmode == MCAST_INCLUDE) {
747 struct ip6_sf_list *psf;
748
749 rcu_assign_pointer(pmc->mca_tomb,
750 mc_dereference(im->mca_tomb, idev));
751 rcu_assign_pointer(pmc->mca_sources,
752 mc_dereference(im->mca_sources, idev));
753 RCU_INIT_POINTER(im->mca_tomb, NULL);
754 RCU_INIT_POINTER(im->mca_sources, NULL);
755
756 for_each_psf_mclock(pmc, psf)
757 psf->sf_crcount = pmc->mca_crcount;
758 }
759
760 rcu_assign_pointer(pmc->next, idev->mc_tomb);
761 rcu_assign_pointer(idev->mc_tomb, pmc);
762}
763
764/* called with mc_lock */
765static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
766{
767 struct ip6_sf_list *psf, *sources, *tomb;
768 struct in6_addr *pmca = &im->mca_addr;
769 struct ifmcaddr6 *pmc, *pmc_prev;
770
771 pmc_prev = NULL;
772 for_each_mc_tomb(idev, pmc) {
773 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
774 break;
775 pmc_prev = pmc;
776 }
777 if (pmc) {
778 if (pmc_prev)
779 rcu_assign_pointer(pmc_prev->next, pmc->next);
780 else
781 rcu_assign_pointer(idev->mc_tomb, pmc->next);
782 }
783
784 if (pmc) {
785 im->idev = pmc->idev;
786 if (im->mca_sfmode == MCAST_INCLUDE) {
787 tomb = rcu_replace_pointer(im->mca_tomb,
788 mc_dereference(pmc->mca_tomb, pmc->idev),
789 lockdep_is_held(&im->idev->mc_lock));
790 rcu_assign_pointer(pmc->mca_tomb, tomb);
791
792 sources = rcu_replace_pointer(im->mca_sources,
793 mc_dereference(pmc->mca_sources, pmc->idev),
794 lockdep_is_held(&im->idev->mc_lock));
795 rcu_assign_pointer(pmc->mca_sources, sources);
796 for_each_psf_mclock(im, psf)
797 psf->sf_crcount = idev->mc_qrv;
798 } else {
799 im->mca_crcount = idev->mc_qrv;
800 }
801 in6_dev_put(pmc->idev);
802 ip6_mc_clear_src(pmc);
803 kfree_rcu(pmc, rcu);
804 }
805}
806
807/* called with mc_lock */
808static void mld_clear_delrec(struct inet6_dev *idev)
809{
810 struct ifmcaddr6 *pmc, *nextpmc;
811
812 pmc = mc_dereference(idev->mc_tomb, idev);
813 RCU_INIT_POINTER(idev->mc_tomb, NULL);
814
815 for (; pmc; pmc = nextpmc) {
816 nextpmc = mc_dereference(pmc->next, idev);
817 ip6_mc_clear_src(pmc);
818 in6_dev_put(pmc->idev);
819 kfree_rcu(pmc, rcu);
820 }
821
822 /* clear dead sources, too */
823 for_each_mc_mclock(idev, pmc) {
824 struct ip6_sf_list *psf, *psf_next;
825
826 psf = mc_dereference(pmc->mca_tomb, idev);
827 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
828 for (; psf; psf = psf_next) {
829 psf_next = mc_dereference(psf->sf_next, idev);
830 kfree_rcu(psf, rcu);
831 }
832 }
833}
834
835static void mld_clear_query(struct inet6_dev *idev)
836{
837 struct sk_buff *skb;
838
839 spin_lock_bh(&idev->mc_query_lock);
840 while ((skb = __skb_dequeue(&idev->mc_query_queue)))
841 kfree_skb(skb);
842 spin_unlock_bh(&idev->mc_query_lock);
843}
844
845static void mld_clear_report(struct inet6_dev *idev)
846{
847 struct sk_buff *skb;
848
849 spin_lock_bh(&idev->mc_report_lock);
850 while ((skb = __skb_dequeue(&idev->mc_report_queue)))
851 kfree_skb(skb);
852 spin_unlock_bh(&idev->mc_report_lock);
853}
854
855static void mca_get(struct ifmcaddr6 *mc)
856{
857 refcount_inc(&mc->mca_refcnt);
858}
859
860static void ma_put(struct ifmcaddr6 *mc)
861{
862 if (refcount_dec_and_test(&mc->mca_refcnt)) {
863 in6_dev_put(mc->idev);
864 kfree_rcu(mc, rcu);
865 }
866}
867
868/* called with mc_lock */
869static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
870 const struct in6_addr *addr,
871 unsigned int mode)
872{
873 struct ifmcaddr6 *mc;
874
875 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
876 if (!mc)
877 return NULL;
878
879 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work);
880
881 mc->mca_addr = *addr;
882 mc->idev = idev; /* reference taken by caller */
883 mc->mca_users = 1;
884 /* mca_stamp should be updated upon changes */
885 mc->mca_cstamp = mc->mca_tstamp = jiffies;
886 refcount_set(&mc->mca_refcnt, 1);
887
888 mc->mca_sfmode = mode;
889 mc->mca_sfcount[mode] = 1;
890
891 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
892 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
893 mc->mca_flags |= MAF_NOREPORT;
894
895 return mc;
896}
897
898/*
899 * device multicast group inc (add if not found)
900 */
901static int __ipv6_dev_mc_inc(struct net_device *dev,
902 const struct in6_addr *addr, unsigned int mode)
903{
904 struct ifmcaddr6 *mc;
905 struct inet6_dev *idev;
906
907 ASSERT_RTNL();
908
909 /* we need to take a reference on idev */
910 idev = in6_dev_get(dev);
911
912 if (!idev)
913 return -EINVAL;
914
915 if (idev->dead) {
916 in6_dev_put(idev);
917 return -ENODEV;
918 }
919
920 mutex_lock(&idev->mc_lock);
921 for_each_mc_mclock(idev, mc) {
922 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
923 mc->mca_users++;
924 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
925 mutex_unlock(&idev->mc_lock);
926 in6_dev_put(idev);
927 return 0;
928 }
929 }
930
931 mc = mca_alloc(idev, addr, mode);
932 if (!mc) {
933 mutex_unlock(&idev->mc_lock);
934 in6_dev_put(idev);
935 return -ENOMEM;
936 }
937
938 rcu_assign_pointer(mc->next, idev->mc_list);
939 rcu_assign_pointer(idev->mc_list, mc);
940
941 mca_get(mc);
942
943 mld_del_delrec(idev, mc);
944 igmp6_group_added(mc);
945 mutex_unlock(&idev->mc_lock);
946 ma_put(mc);
947 return 0;
948}
949
950int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
951{
952 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
953}
954EXPORT_SYMBOL(ipv6_dev_mc_inc);
955
956/*
957 * device multicast group del
958 */
959int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
960{
961 struct ifmcaddr6 *ma, __rcu **map;
962
963 ASSERT_RTNL();
964
965 mutex_lock(&idev->mc_lock);
966 for (map = &idev->mc_list;
967 (ma = mc_dereference(*map, idev));
968 map = &ma->next) {
969 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
970 if (--ma->mca_users == 0) {
971 *map = ma->next;
972
973 igmp6_group_dropped(ma);
974 ip6_mc_clear_src(ma);
975 mutex_unlock(&idev->mc_lock);
976
977 ma_put(ma);
978 return 0;
979 }
980 mutex_unlock(&idev->mc_lock);
981 return 0;
982 }
983 }
984
985 mutex_unlock(&idev->mc_lock);
986 return -ENOENT;
987}
988
989int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
990{
991 struct inet6_dev *idev;
992 int err;
993
994 ASSERT_RTNL();
995
996 idev = __in6_dev_get(dev);
997 if (!idev)
998 err = -ENODEV;
999 else
1000 err = __ipv6_dev_mc_dec(idev, addr);
1001
1002 return err;
1003}
1004EXPORT_SYMBOL(ipv6_dev_mc_dec);
1005
1006/*
1007 * check if the interface/address pair is valid
1008 */
1009bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1010 const struct in6_addr *src_addr)
1011{
1012 struct inet6_dev *idev;
1013 struct ifmcaddr6 *mc;
1014 bool rv = false;
1015
1016 rcu_read_lock();
1017 idev = __in6_dev_get(dev);
1018 if (idev) {
1019 for_each_mc_rcu(idev, mc) {
1020 if (ipv6_addr_equal(&mc->mca_addr, group))
1021 break;
1022 }
1023 if (mc) {
1024 if (src_addr && !ipv6_addr_any(src_addr)) {
1025 struct ip6_sf_list *psf;
1026
1027 for_each_psf_rcu(mc, psf) {
1028 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1029 break;
1030 }
1031 if (psf)
1032 rv = psf->sf_count[MCAST_INCLUDE] ||
1033 psf->sf_count[MCAST_EXCLUDE] !=
1034 mc->mca_sfcount[MCAST_EXCLUDE];
1035 else
1036 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1037 } else
1038 rv = true; /* don't filter unspecified source */
1039 }
1040 }
1041 rcu_read_unlock();
1042 return rv;
1043}
1044
1045/* called with mc_lock */
1046static void mld_gq_start_work(struct inet6_dev *idev)
1047{
1048 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1049
1050 idev->mc_gq_running = 1;
1051 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
1052 in6_dev_hold(idev);
1053}
1054
1055/* called with mc_lock */
1056static void mld_gq_stop_work(struct inet6_dev *idev)
1057{
1058 idev->mc_gq_running = 0;
1059 if (cancel_delayed_work(&idev->mc_gq_work))
1060 __in6_dev_put(idev);
1061}
1062
1063/* called with mc_lock */
1064static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
1065{
1066 unsigned long tv = prandom_u32() % delay;
1067
1068 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
1069 in6_dev_hold(idev);
1070}
1071
1072/* called with mc_lock */
1073static void mld_ifc_stop_work(struct inet6_dev *idev)
1074{
1075 idev->mc_ifc_count = 0;
1076 if (cancel_delayed_work(&idev->mc_ifc_work))
1077 __in6_dev_put(idev);
1078}
1079
1080/* called with mc_lock */
1081static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
1082{
1083 unsigned long tv = prandom_u32() % delay;
1084
1085 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
1086 in6_dev_hold(idev);
1087}
1088
1089static void mld_dad_stop_work(struct inet6_dev *idev)
1090{
1091 if (cancel_delayed_work(&idev->mc_dad_work))
1092 __in6_dev_put(idev);
1093}
1094
1095static void mld_query_stop_work(struct inet6_dev *idev)
1096{
1097 spin_lock_bh(&idev->mc_query_lock);
1098 if (cancel_delayed_work(&idev->mc_query_work))
1099 __in6_dev_put(idev);
1100 spin_unlock_bh(&idev->mc_query_lock);
1101}
1102
1103static void mld_report_stop_work(struct inet6_dev *idev)
1104{
1105 if (cancel_delayed_work_sync(&idev->mc_report_work))
1106 __in6_dev_put(idev);
1107}
1108
1109/*
1110 * IGMP handling (alias multicast ICMPv6 messages)
1111 * called with mc_lock
1112 */
1113static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1114{
1115 unsigned long delay = resptime;
1116
1117 /* Do not start work for these addresses */
1118 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1119 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1120 return;
1121
1122 if (cancel_delayed_work(&ma->mca_work)) {
1123 refcount_dec(&ma->mca_refcnt);
1124 delay = ma->mca_work.timer.expires - jiffies;
1125 }
1126
1127 if (delay >= resptime)
1128 delay = prandom_u32() % resptime;
1129
1130 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
1131 refcount_inc(&ma->mca_refcnt);
1132 ma->mca_flags |= MAF_TIMER_RUNNING;
1133}
1134
1135/* mark EXCLUDE-mode sources
1136 * called with mc_lock
1137 */
1138static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1139 const struct in6_addr *srcs)
1140{
1141 struct ip6_sf_list *psf;
1142 int i, scount;
1143
1144 scount = 0;
1145 for_each_psf_mclock(pmc, psf) {
1146 if (scount == nsrcs)
1147 break;
1148 for (i = 0; i < nsrcs; i++) {
1149 /* skip inactive filters */
1150 if (psf->sf_count[MCAST_INCLUDE] ||
1151 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1152 psf->sf_count[MCAST_EXCLUDE])
1153 break;
1154 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1155 scount++;
1156 break;
1157 }
1158 }
1159 }
1160 pmc->mca_flags &= ~MAF_GSQUERY;
1161 if (scount == nsrcs) /* all sources excluded */
1162 return false;
1163 return true;
1164}
1165
1166/* called with mc_lock */
1167static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1168 const struct in6_addr *srcs)
1169{
1170 struct ip6_sf_list *psf;
1171 int i, scount;
1172
1173 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1174 return mld_xmarksources(pmc, nsrcs, srcs);
1175
1176 /* mark INCLUDE-mode sources */
1177
1178 scount = 0;
1179 for_each_psf_mclock(pmc, psf) {
1180 if (scount == nsrcs)
1181 break;
1182 for (i = 0; i < nsrcs; i++) {
1183 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1184 psf->sf_gsresp = 1;
1185 scount++;
1186 break;
1187 }
1188 }
1189 }
1190 if (!scount) {
1191 pmc->mca_flags &= ~MAF_GSQUERY;
1192 return false;
1193 }
1194 pmc->mca_flags |= MAF_GSQUERY;
1195 return true;
1196}
1197
1198static int mld_force_mld_version(const struct inet6_dev *idev)
1199{
1200 /* Normally, both are 0 here. If enforcement to a particular is
1201 * being used, individual device enforcement will have a lower
1202 * precedence over 'all' device (.../conf/all/force_mld_version).
1203 */
1204
1205 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1206 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1207 else
1208 return idev->cnf.force_mld_version;
1209}
1210
1211static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1212{
1213 return mld_force_mld_version(idev) == 2;
1214}
1215
1216static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1217{
1218 return mld_force_mld_version(idev) == 1;
1219}
1220
1221static bool mld_in_v1_mode(const struct inet6_dev *idev)
1222{
1223 if (mld_in_v2_mode_only(idev))
1224 return false;
1225 if (mld_in_v1_mode_only(idev))
1226 return true;
1227 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1228 return true;
1229
1230 return false;
1231}
1232
1233static void mld_set_v1_mode(struct inet6_dev *idev)
1234{
1235 /* RFC3810, relevant sections:
1236 * - 9.1. Robustness Variable
1237 * - 9.2. Query Interval
1238 * - 9.3. Query Response Interval
1239 * - 9.12. Older Version Querier Present Timeout
1240 */
1241 unsigned long switchback;
1242
1243 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1244
1245 idev->mc_v1_seen = jiffies + switchback;
1246}
1247
1248static void mld_update_qrv(struct inet6_dev *idev,
1249 const struct mld2_query *mlh2)
1250{
1251 /* RFC3810, relevant sections:
1252 * - 5.1.8. QRV (Querier's Robustness Variable)
1253 * - 9.1. Robustness Variable
1254 */
1255
1256 /* The value of the Robustness Variable MUST NOT be zero,
1257 * and SHOULD NOT be one. Catch this here if we ever run
1258 * into such a case in future.
1259 */
1260 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1261 WARN_ON(idev->mc_qrv == 0);
1262
1263 if (mlh2->mld2q_qrv > 0)
1264 idev->mc_qrv = mlh2->mld2q_qrv;
1265
1266 if (unlikely(idev->mc_qrv < min_qrv)) {
1267 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1268 idev->mc_qrv, min_qrv);
1269 idev->mc_qrv = min_qrv;
1270 }
1271}
1272
1273static void mld_update_qi(struct inet6_dev *idev,
1274 const struct mld2_query *mlh2)
1275{
1276 /* RFC3810, relevant sections:
1277 * - 5.1.9. QQIC (Querier's Query Interval Code)
1278 * - 9.2. Query Interval
1279 * - 9.12. Older Version Querier Present Timeout
1280 * (the [Query Interval] in the last Query received)
1281 */
1282 unsigned long mc_qqi;
1283
1284 if (mlh2->mld2q_qqic < 128) {
1285 mc_qqi = mlh2->mld2q_qqic;
1286 } else {
1287 unsigned long mc_man, mc_exp;
1288
1289 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1290 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1291
1292 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1293 }
1294
1295 idev->mc_qi = mc_qqi * HZ;
1296}
1297
1298static void mld_update_qri(struct inet6_dev *idev,
1299 const struct mld2_query *mlh2)
1300{
1301 /* RFC3810, relevant sections:
1302 * - 5.1.3. Maximum Response Code
1303 * - 9.3. Query Response Interval
1304 */
1305 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1306}
1307
1308static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1309 unsigned long *max_delay, bool v1_query)
1310{
1311 unsigned long mldv1_md;
1312
1313 /* Ignore v1 queries */
1314 if (mld_in_v2_mode_only(idev))
1315 return -EINVAL;
1316
1317 mldv1_md = ntohs(mld->mld_maxdelay);
1318
1319 /* When in MLDv1 fallback and a MLDv2 router start-up being
1320 * unaware of current MLDv1 operation, the MRC == MRD mapping
1321 * only works when the exponential algorithm is not being
1322 * used (as MLDv1 is unaware of such things).
1323 *
1324 * According to the RFC author, the MLDv2 implementations
1325 * he's aware of all use a MRC < 32768 on start up queries.
1326 *
1327 * Thus, should we *ever* encounter something else larger
1328 * than that, just assume the maximum possible within our
1329 * reach.
1330 */
1331 if (!v1_query)
1332 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1333
1334 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1335
1336 /* MLDv1 router present: we need to go into v1 mode *only*
1337 * when an MLDv1 query is received as per section 9.12. of
1338 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1339 * queries MUST be of exactly 24 octets.
1340 */
1341 if (v1_query)
1342 mld_set_v1_mode(idev);
1343
1344 /* cancel MLDv2 report work */
1345 mld_gq_stop_work(idev);
1346 /* cancel the interface change work */
1347 mld_ifc_stop_work(idev);
1348 /* clear deleted report items */
1349 mld_clear_delrec(idev);
1350
1351 return 0;
1352}
1353
1354static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1355 unsigned long *max_delay)
1356{
1357 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1358
1359 mld_update_qrv(idev, mld);
1360 mld_update_qi(idev, mld);
1361 mld_update_qri(idev, mld);
1362
1363 idev->mc_maxdelay = *max_delay;
1364
1365 return 0;
1366}
1367
1368/* called with rcu_read_lock() */
1369int igmp6_event_query(struct sk_buff *skb)
1370{
1371 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1372
1373 if (!idev)
1374 return -EINVAL;
1375
1376 if (idev->dead) {
1377 kfree_skb(skb);
1378 return -ENODEV;
1379 }
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 }
1387 spin_unlock_bh(&idev->mc_query_lock);
1388
1389 return 0;
1390}
1391
1392static void __mld_query_work(struct sk_buff *skb)
1393{
1394 struct mld2_query *mlh2 = NULL;
1395 const struct in6_addr *group;
1396 unsigned long max_delay;
1397 struct inet6_dev *idev;
1398 struct ifmcaddr6 *ma;
1399 struct mld_msg *mld;
1400 int group_type;
1401 int mark = 0;
1402 int len, err;
1403
1404 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1405 goto kfree_skb;
1406
1407 /* compute payload length excluding extension headers */
1408 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1409 len -= skb_network_header_len(skb);
1410
1411 /* RFC3810 6.2
1412 * Upon reception of an MLD message that contains a Query, the node
1413 * checks if the source address of the message is a valid link-local
1414 * address, if the Hop Limit is set to 1, and if the Router Alert
1415 * option is present in the Hop-By-Hop Options header of the IPv6
1416 * packet. If any of these checks fails, the packet is dropped.
1417 */
1418 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1419 ipv6_hdr(skb)->hop_limit != 1 ||
1420 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1421 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1422 goto kfree_skb;
1423
1424 idev = in6_dev_get(skb->dev);
1425 if (!idev)
1426 goto kfree_skb;
1427
1428 mld = (struct mld_msg *)icmp6_hdr(skb);
1429 group = &mld->mld_mca;
1430 group_type = ipv6_addr_type(group);
1431
1432 if (group_type != IPV6_ADDR_ANY &&
1433 !(group_type&IPV6_ADDR_MULTICAST))
1434 goto out;
1435
1436 if (len < MLD_V1_QUERY_LEN) {
1437 goto out;
1438 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1439 err = mld_process_v1(idev, mld, &max_delay,
1440 len == MLD_V1_QUERY_LEN);
1441 if (err < 0)
1442 goto out;
1443 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1444 int srcs_offset = sizeof(struct mld2_query) -
1445 sizeof(struct icmp6hdr);
1446
1447 if (!pskb_may_pull(skb, srcs_offset))
1448 goto out;
1449
1450 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1451
1452 err = mld_process_v2(idev, mlh2, &max_delay);
1453 if (err < 0)
1454 goto out;
1455
1456 if (group_type == IPV6_ADDR_ANY) { /* general query */
1457 if (mlh2->mld2q_nsrcs)
1458 goto out; /* no sources allowed */
1459
1460 mld_gq_start_work(idev);
1461 goto out;
1462 }
1463 /* mark sources to include, if group & source-specific */
1464 if (mlh2->mld2q_nsrcs != 0) {
1465 if (!pskb_may_pull(skb, srcs_offset +
1466 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1467 goto out;
1468
1469 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1470 mark = 1;
1471 }
1472 } else {
1473 goto out;
1474 }
1475
1476 if (group_type == IPV6_ADDR_ANY) {
1477 for_each_mc_mclock(idev, ma) {
1478 igmp6_group_queried(ma, max_delay);
1479 }
1480 } else {
1481 for_each_mc_mclock(idev, ma) {
1482 if (!ipv6_addr_equal(group, &ma->mca_addr))
1483 continue;
1484 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1485 /* gsquery <- gsquery && mark */
1486 if (!mark)
1487 ma->mca_flags &= ~MAF_GSQUERY;
1488 } else {
1489 /* gsquery <- mark */
1490 if (mark)
1491 ma->mca_flags |= MAF_GSQUERY;
1492 else
1493 ma->mca_flags &= ~MAF_GSQUERY;
1494 }
1495 if (!(ma->mca_flags & MAF_GSQUERY) ||
1496 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1497 igmp6_group_queried(ma, max_delay);
1498 break;
1499 }
1500 }
1501
1502out:
1503 in6_dev_put(idev);
1504kfree_skb:
1505 consume_skb(skb);
1506}
1507
1508static void mld_query_work(struct work_struct *work)
1509{
1510 struct inet6_dev *idev = container_of(to_delayed_work(work),
1511 struct inet6_dev,
1512 mc_query_work);
1513 struct sk_buff_head q;
1514 struct sk_buff *skb;
1515 bool rework = false;
1516 int cnt = 0;
1517
1518 skb_queue_head_init(&q);
1519
1520 spin_lock_bh(&idev->mc_query_lock);
1521 while ((skb = __skb_dequeue(&idev->mc_query_queue))) {
1522 __skb_queue_tail(&q, skb);
1523
1524 if (++cnt >= MLD_MAX_QUEUE) {
1525 rework = true;
1526 schedule_delayed_work(&idev->mc_query_work, 0);
1527 break;
1528 }
1529 }
1530 spin_unlock_bh(&idev->mc_query_lock);
1531
1532 mutex_lock(&idev->mc_lock);
1533 while ((skb = __skb_dequeue(&q)))
1534 __mld_query_work(skb);
1535 mutex_unlock(&idev->mc_lock);
1536
1537 if (!rework)
1538 in6_dev_put(idev);
1539}
1540
1541/* called with rcu_read_lock() */
1542int igmp6_event_report(struct sk_buff *skb)
1543{
1544 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1545
1546 if (!idev)
1547 return -EINVAL;
1548
1549 if (idev->dead) {
1550 kfree_skb(skb);
1551 return -ENODEV;
1552 }
1553
1554 spin_lock_bh(&idev->mc_report_lock);
1555 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) {
1556 __skb_queue_tail(&idev->mc_report_queue, skb);
1557 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0))
1558 in6_dev_hold(idev);
1559 }
1560 spin_unlock_bh(&idev->mc_report_lock);
1561
1562 return 0;
1563}
1564
1565static void __mld_report_work(struct sk_buff *skb)
1566{
1567 struct inet6_dev *idev;
1568 struct ifmcaddr6 *ma;
1569 struct mld_msg *mld;
1570 int addr_type;
1571
1572 /* Our own report looped back. Ignore it. */
1573 if (skb->pkt_type == PACKET_LOOPBACK)
1574 goto kfree_skb;
1575
1576 /* send our report if the MC router may not have heard this report */
1577 if (skb->pkt_type != PACKET_MULTICAST &&
1578 skb->pkt_type != PACKET_BROADCAST)
1579 goto kfree_skb;
1580
1581 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1582 goto kfree_skb;
1583
1584 mld = (struct mld_msg *)icmp6_hdr(skb);
1585
1586 /* Drop reports with not link local source */
1587 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1588 if (addr_type != IPV6_ADDR_ANY &&
1589 !(addr_type&IPV6_ADDR_LINKLOCAL))
1590 goto kfree_skb;
1591
1592 idev = in6_dev_get(skb->dev);
1593 if (!idev)
1594 goto kfree_skb;
1595
1596 /*
1597 * Cancel the work for this group
1598 */
1599
1600 for_each_mc_mclock(idev, ma) {
1601 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1602 if (cancel_delayed_work(&ma->mca_work))
1603 refcount_dec(&ma->mca_refcnt);
1604 ma->mca_flags &= ~(MAF_LAST_REPORTER |
1605 MAF_TIMER_RUNNING);
1606 break;
1607 }
1608 }
1609
1610 in6_dev_put(idev);
1611kfree_skb:
1612 consume_skb(skb);
1613}
1614
1615static void mld_report_work(struct work_struct *work)
1616{
1617 struct inet6_dev *idev = container_of(to_delayed_work(work),
1618 struct inet6_dev,
1619 mc_report_work);
1620 struct sk_buff_head q;
1621 struct sk_buff *skb;
1622 bool rework = false;
1623 int cnt = 0;
1624
1625 skb_queue_head_init(&q);
1626 spin_lock_bh(&idev->mc_report_lock);
1627 while ((skb = __skb_dequeue(&idev->mc_report_queue))) {
1628 __skb_queue_tail(&q, skb);
1629
1630 if (++cnt >= MLD_MAX_QUEUE) {
1631 rework = true;
1632 schedule_delayed_work(&idev->mc_report_work, 0);
1633 break;
1634 }
1635 }
1636 spin_unlock_bh(&idev->mc_report_lock);
1637
1638 mutex_lock(&idev->mc_lock);
1639 while ((skb = __skb_dequeue(&q)))
1640 __mld_report_work(skb);
1641 mutex_unlock(&idev->mc_lock);
1642
1643 if (!rework)
1644 in6_dev_put(idev);
1645}
1646
1647static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1648 int gdeleted, int sdeleted)
1649{
1650 switch (type) {
1651 case MLD2_MODE_IS_INCLUDE:
1652 case MLD2_MODE_IS_EXCLUDE:
1653 if (gdeleted || sdeleted)
1654 return false;
1655 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1656 if (pmc->mca_sfmode == MCAST_INCLUDE)
1657 return true;
1658 /* don't include if this source is excluded
1659 * in all filters
1660 */
1661 if (psf->sf_count[MCAST_INCLUDE])
1662 return type == MLD2_MODE_IS_INCLUDE;
1663 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1664 psf->sf_count[MCAST_EXCLUDE];
1665 }
1666 return false;
1667 case MLD2_CHANGE_TO_INCLUDE:
1668 if (gdeleted || sdeleted)
1669 return false;
1670 return psf->sf_count[MCAST_INCLUDE] != 0;
1671 case MLD2_CHANGE_TO_EXCLUDE:
1672 if (gdeleted || sdeleted)
1673 return false;
1674 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1675 psf->sf_count[MCAST_INCLUDE])
1676 return false;
1677 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1678 psf->sf_count[MCAST_EXCLUDE];
1679 case MLD2_ALLOW_NEW_SOURCES:
1680 if (gdeleted || !psf->sf_crcount)
1681 return false;
1682 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1683 case MLD2_BLOCK_OLD_SOURCES:
1684 if (pmc->mca_sfmode == MCAST_INCLUDE)
1685 return gdeleted || (psf->sf_crcount && sdeleted);
1686 return psf->sf_crcount && !gdeleted && !sdeleted;
1687 }
1688 return false;
1689}
1690
1691static int
1692mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1693{
1694 struct ip6_sf_list *psf;
1695 int scount = 0;
1696
1697 for_each_psf_mclock(pmc, psf) {
1698 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1699 continue;
1700 scount++;
1701 }
1702 return scount;
1703}
1704
1705static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1706 struct net_device *dev,
1707 const struct in6_addr *saddr,
1708 const struct in6_addr *daddr,
1709 int proto, int len)
1710{
1711 struct ipv6hdr *hdr;
1712
1713 skb->protocol = htons(ETH_P_IPV6);
1714 skb->dev = dev;
1715
1716 skb_reset_network_header(skb);
1717 skb_put(skb, sizeof(struct ipv6hdr));
1718 hdr = ipv6_hdr(skb);
1719
1720 ip6_flow_hdr(hdr, 0, 0);
1721
1722 hdr->payload_len = htons(len);
1723 hdr->nexthdr = proto;
1724 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1725
1726 hdr->saddr = *saddr;
1727 hdr->daddr = *daddr;
1728}
1729
1730static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1731{
1732 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1733 2, 0, 0, IPV6_TLV_PADN, 0 };
1734 struct net_device *dev = idev->dev;
1735 int hlen = LL_RESERVED_SPACE(dev);
1736 int tlen = dev->needed_tailroom;
1737 struct net *net = dev_net(dev);
1738 const struct in6_addr *saddr;
1739 struct in6_addr addr_buf;
1740 struct mld2_report *pmr;
1741 struct sk_buff *skb;
1742 unsigned int size;
1743 struct sock *sk;
1744 int err;
1745
1746 sk = net->ipv6.igmp_sk;
1747 /* we assume size > sizeof(ra) here
1748 * Also try to not allocate high-order pages for big MTU
1749 */
1750 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
1751 skb = sock_alloc_send_skb(sk, size, 1, &err);
1752 if (!skb)
1753 return NULL;
1754
1755 skb->priority = TC_PRIO_CONTROL;
1756 skb_reserve(skb, hlen);
1757 skb_tailroom_reserve(skb, mtu, tlen);
1758
1759 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1760 /* <draft-ietf-magma-mld-source-05.txt>:
1761 * use unspecified address as the source address
1762 * when a valid link-local address is not available.
1763 */
1764 saddr = &in6addr_any;
1765 } else
1766 saddr = &addr_buf;
1767
1768 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1769
1770 skb_put_data(skb, ra, sizeof(ra));
1771
1772 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1773 skb_put(skb, sizeof(*pmr));
1774 pmr = (struct mld2_report *)skb_transport_header(skb);
1775 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1776 pmr->mld2r_resv1 = 0;
1777 pmr->mld2r_cksum = 0;
1778 pmr->mld2r_resv2 = 0;
1779 pmr->mld2r_ngrec = 0;
1780 return skb;
1781}
1782
1783static void mld_sendpack(struct sk_buff *skb)
1784{
1785 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1786 struct mld2_report *pmr =
1787 (struct mld2_report *)skb_transport_header(skb);
1788 int payload_len, mldlen;
1789 struct inet6_dev *idev;
1790 struct net *net = dev_net(skb->dev);
1791 int err;
1792 struct flowi6 fl6;
1793 struct dst_entry *dst;
1794
1795 rcu_read_lock();
1796 idev = __in6_dev_get(skb->dev);
1797 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1798
1799 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1800 sizeof(*pip6);
1801 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1802 pip6->payload_len = htons(payload_len);
1803
1804 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1805 IPPROTO_ICMPV6,
1806 csum_partial(skb_transport_header(skb),
1807 mldlen, 0));
1808
1809 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1810 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1811 skb->dev->ifindex);
1812 dst = icmp6_dst_alloc(skb->dev, &fl6);
1813
1814 err = 0;
1815 if (IS_ERR(dst)) {
1816 err = PTR_ERR(dst);
1817 dst = NULL;
1818 }
1819 skb_dst_set(skb, dst);
1820 if (err)
1821 goto err_out;
1822
1823 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1824 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1825 dst_output);
1826out:
1827 if (!err) {
1828 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1829 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1830 } else {
1831 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1832 }
1833
1834 rcu_read_unlock();
1835 return;
1836
1837err_out:
1838 kfree_skb(skb);
1839 goto out;
1840}
1841
1842static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1843{
1844 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1845}
1846
1847static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1848 int type, struct mld2_grec **ppgr, unsigned int mtu)
1849{
1850 struct mld2_report *pmr;
1851 struct mld2_grec *pgr;
1852
1853 if (!skb) {
1854 skb = mld_newpack(pmc->idev, mtu);
1855 if (!skb)
1856 return NULL;
1857 }
1858 pgr = skb_put(skb, sizeof(struct mld2_grec));
1859 pgr->grec_type = type;
1860 pgr->grec_auxwords = 0;
1861 pgr->grec_nsrcs = 0;
1862 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1863 pmr = (struct mld2_report *)skb_transport_header(skb);
1864 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1865 *ppgr = pgr;
1866 return skb;
1867}
1868
1869#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1870
1871/* called with mc_lock */
1872static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1873 int type, int gdeleted, int sdeleted,
1874 int crsend)
1875{
1876 struct ip6_sf_list *psf, *psf_prev, *psf_next;
1877 int scount, stotal, first, isquery, truncate;
1878 struct ip6_sf_list __rcu **psf_list;
1879 struct inet6_dev *idev = pmc->idev;
1880 struct net_device *dev = idev->dev;
1881 struct mld2_grec *pgr = NULL;
1882 struct mld2_report *pmr;
1883 unsigned int mtu;
1884
1885 if (pmc->mca_flags & MAF_NOREPORT)
1886 return skb;
1887
1888 mtu = READ_ONCE(dev->mtu);
1889 if (mtu < IPV6_MIN_MTU)
1890 return skb;
1891
1892 isquery = type == MLD2_MODE_IS_INCLUDE ||
1893 type == MLD2_MODE_IS_EXCLUDE;
1894 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1895 type == MLD2_CHANGE_TO_EXCLUDE;
1896
1897 stotal = scount = 0;
1898
1899 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1900
1901 if (!rcu_access_pointer(*psf_list))
1902 goto empty_source;
1903
1904 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1905
1906 /* EX and TO_EX get a fresh packet, if needed */
1907 if (truncate) {
1908 if (pmr && pmr->mld2r_ngrec &&
1909 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1910 if (skb)
1911 mld_sendpack(skb);
1912 skb = mld_newpack(idev, mtu);
1913 }
1914 }
1915 first = 1;
1916 psf_prev = NULL;
1917 for (psf = mc_dereference(*psf_list, idev);
1918 psf;
1919 psf = psf_next) {
1920 struct in6_addr *psrc;
1921
1922 psf_next = mc_dereference(psf->sf_next, idev);
1923
1924 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1925 psf_prev = psf;
1926 continue;
1927 }
1928
1929 /* Based on RFC3810 6.1. Should not send source-list change
1930 * records when there is a filter mode change.
1931 */
1932 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1933 (!gdeleted && pmc->mca_crcount)) &&
1934 (type == MLD2_ALLOW_NEW_SOURCES ||
1935 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1936 goto decrease_sf_crcount;
1937
1938 /* clear marks on query responses */
1939 if (isquery)
1940 psf->sf_gsresp = 0;
1941
1942 if (AVAILABLE(skb) < sizeof(*psrc) +
1943 first*sizeof(struct mld2_grec)) {
1944 if (truncate && !first)
1945 break; /* truncate these */
1946 if (pgr)
1947 pgr->grec_nsrcs = htons(scount);
1948 if (skb)
1949 mld_sendpack(skb);
1950 skb = mld_newpack(idev, mtu);
1951 first = 1;
1952 scount = 0;
1953 }
1954 if (first) {
1955 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1956 first = 0;
1957 }
1958 if (!skb)
1959 return NULL;
1960 psrc = skb_put(skb, sizeof(*psrc));
1961 *psrc = psf->sf_addr;
1962 scount++; stotal++;
1963 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1964 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1965decrease_sf_crcount:
1966 psf->sf_crcount--;
1967 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1968 if (psf_prev)
1969 rcu_assign_pointer(psf_prev->sf_next,
1970 mc_dereference(psf->sf_next, idev));
1971 else
1972 rcu_assign_pointer(*psf_list,
1973 mc_dereference(psf->sf_next, idev));
1974 kfree_rcu(psf, rcu);
1975 continue;
1976 }
1977 }
1978 psf_prev = psf;
1979 }
1980
1981empty_source:
1982 if (!stotal) {
1983 if (type == MLD2_ALLOW_NEW_SOURCES ||
1984 type == MLD2_BLOCK_OLD_SOURCES)
1985 return skb;
1986 if (pmc->mca_crcount || isquery || crsend) {
1987 /* make sure we have room for group header */
1988 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1989 mld_sendpack(skb);
1990 skb = NULL; /* add_grhead will get a new one */
1991 }
1992 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1993 }
1994 }
1995 if (pgr)
1996 pgr->grec_nsrcs = htons(scount);
1997
1998 if (isquery)
1999 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
2000 return skb;
2001}
2002
2003/* called with mc_lock */
2004static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2005{
2006 struct sk_buff *skb = NULL;
2007 int type;
2008
2009 if (!pmc) {
2010 for_each_mc_mclock(idev, pmc) {
2011 if (pmc->mca_flags & MAF_NOREPORT)
2012 continue;
2013 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2014 type = MLD2_MODE_IS_EXCLUDE;
2015 else
2016 type = MLD2_MODE_IS_INCLUDE;
2017 skb = add_grec(skb, pmc, type, 0, 0, 0);
2018 }
2019 } else {
2020 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2021 type = MLD2_MODE_IS_EXCLUDE;
2022 else
2023 type = MLD2_MODE_IS_INCLUDE;
2024 skb = add_grec(skb, pmc, type, 0, 0, 0);
2025 }
2026 if (skb)
2027 mld_sendpack(skb);
2028}
2029
2030/*
2031 * remove zero-count source records from a source filter list
2032 * called with mc_lock
2033 */
2034static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
2035{
2036 struct ip6_sf_list *psf_prev, *psf_next, *psf;
2037
2038 psf_prev = NULL;
2039 for (psf = mc_dereference(*ppsf, idev);
2040 psf;
2041 psf = psf_next) {
2042 psf_next = mc_dereference(psf->sf_next, idev);
2043 if (psf->sf_crcount == 0) {
2044 if (psf_prev)
2045 rcu_assign_pointer(psf_prev->sf_next,
2046 mc_dereference(psf->sf_next, idev));
2047 else
2048 rcu_assign_pointer(*ppsf,
2049 mc_dereference(psf->sf_next, idev));
2050 kfree_rcu(psf, rcu);
2051 } else {
2052 psf_prev = psf;
2053 }
2054 }
2055}
2056
2057/* called with mc_lock */
2058static void mld_send_cr(struct inet6_dev *idev)
2059{
2060 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2061 struct sk_buff *skb = NULL;
2062 int type, dtype;
2063
2064 /* deleted MCA's */
2065 pmc_prev = NULL;
2066 for (pmc = mc_dereference(idev->mc_tomb, idev);
2067 pmc;
2068 pmc = pmc_next) {
2069 pmc_next = mc_dereference(pmc->next, idev);
2070 if (pmc->mca_sfmode == MCAST_INCLUDE) {
2071 type = MLD2_BLOCK_OLD_SOURCES;
2072 dtype = MLD2_BLOCK_OLD_SOURCES;
2073 skb = add_grec(skb, pmc, type, 1, 0, 0);
2074 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
2075 }
2076 if (pmc->mca_crcount) {
2077 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2078 type = MLD2_CHANGE_TO_INCLUDE;
2079 skb = add_grec(skb, pmc, type, 1, 0, 0);
2080 }
2081 pmc->mca_crcount--;
2082 if (pmc->mca_crcount == 0) {
2083 mld_clear_zeros(&pmc->mca_tomb, idev);
2084 mld_clear_zeros(&pmc->mca_sources, idev);
2085 }
2086 }
2087 if (pmc->mca_crcount == 0 &&
2088 !rcu_access_pointer(pmc->mca_tomb) &&
2089 !rcu_access_pointer(pmc->mca_sources)) {
2090 if (pmc_prev)
2091 rcu_assign_pointer(pmc_prev->next, pmc_next);
2092 else
2093 rcu_assign_pointer(idev->mc_tomb, pmc_next);
2094 in6_dev_put(pmc->idev);
2095 kfree_rcu(pmc, rcu);
2096 } else
2097 pmc_prev = pmc;
2098 }
2099
2100 /* change recs */
2101 for_each_mc_mclock(idev, pmc) {
2102 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2103 type = MLD2_BLOCK_OLD_SOURCES;
2104 dtype = MLD2_ALLOW_NEW_SOURCES;
2105 } else {
2106 type = MLD2_ALLOW_NEW_SOURCES;
2107 dtype = MLD2_BLOCK_OLD_SOURCES;
2108 }
2109 skb = add_grec(skb, pmc, type, 0, 0, 0);
2110 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
2111
2112 /* filter mode changes */
2113 if (pmc->mca_crcount) {
2114 if (pmc->mca_sfmode == MCAST_EXCLUDE)
2115 type = MLD2_CHANGE_TO_EXCLUDE;
2116 else
2117 type = MLD2_CHANGE_TO_INCLUDE;
2118 skb = add_grec(skb, pmc, type, 0, 0, 0);
2119 pmc->mca_crcount--;
2120 }
2121 }
2122 if (!skb)
2123 return;
2124 (void) mld_sendpack(skb);
2125}
2126
2127static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2128{
2129 struct net *net = dev_net(dev);
2130 struct sock *sk = net->ipv6.igmp_sk;
2131 struct inet6_dev *idev;
2132 struct sk_buff *skb;
2133 struct mld_msg *hdr;
2134 const struct in6_addr *snd_addr, *saddr;
2135 struct in6_addr addr_buf;
2136 int hlen = LL_RESERVED_SPACE(dev);
2137 int tlen = dev->needed_tailroom;
2138 int err, len, payload_len, full_len;
2139 u8 ra[8] = { IPPROTO_ICMPV6, 0,
2140 IPV6_TLV_ROUTERALERT, 2, 0, 0,
2141 IPV6_TLV_PADN, 0 };
2142 struct flowi6 fl6;
2143 struct dst_entry *dst;
2144
2145 if (type == ICMPV6_MGM_REDUCTION)
2146 snd_addr = &in6addr_linklocal_allrouters;
2147 else
2148 snd_addr = addr;
2149
2150 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2151 payload_len = len + sizeof(ra);
2152 full_len = sizeof(struct ipv6hdr) + payload_len;
2153
2154 rcu_read_lock();
2155 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2156 IPSTATS_MIB_OUT, full_len);
2157 rcu_read_unlock();
2158
2159 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2160
2161 if (!skb) {
2162 rcu_read_lock();
2163 IP6_INC_STATS(net, __in6_dev_get(dev),
2164 IPSTATS_MIB_OUTDISCARDS);
2165 rcu_read_unlock();
2166 return;
2167 }
2168 skb->priority = TC_PRIO_CONTROL;
2169 skb_reserve(skb, hlen);
2170
2171 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2172 /* <draft-ietf-magma-mld-source-05.txt>:
2173 * use unspecified address as the source address
2174 * when a valid link-local address is not available.
2175 */
2176 saddr = &in6addr_any;
2177 } else
2178 saddr = &addr_buf;
2179
2180 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2181
2182 skb_put_data(skb, ra, sizeof(ra));
2183
2184 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2185 hdr->mld_type = type;
2186 hdr->mld_mca = *addr;
2187
2188 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2189 IPPROTO_ICMPV6,
2190 csum_partial(hdr, len, 0));
2191
2192 rcu_read_lock();
2193 idev = __in6_dev_get(skb->dev);
2194
2195 icmpv6_flow_init(sk, &fl6, type,
2196 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2197 skb->dev->ifindex);
2198 dst = icmp6_dst_alloc(skb->dev, &fl6);
2199 if (IS_ERR(dst)) {
2200 err = PTR_ERR(dst);
2201 goto err_out;
2202 }
2203
2204 skb_dst_set(skb, dst);
2205 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2206 net, sk, skb, NULL, skb->dev,
2207 dst_output);
2208out:
2209 if (!err) {
2210 ICMP6MSGOUT_INC_STATS(net, idev, type);
2211 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2212 } else
2213 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2214
2215 rcu_read_unlock();
2216 return;
2217
2218err_out:
2219 kfree_skb(skb);
2220 goto out;
2221}
2222
2223/* called with mc_lock */
2224static void mld_send_initial_cr(struct inet6_dev *idev)
2225{
2226 struct sk_buff *skb;
2227 struct ifmcaddr6 *pmc;
2228 int type;
2229
2230 if (mld_in_v1_mode(idev))
2231 return;
2232
2233 skb = NULL;
2234 for_each_mc_mclock(idev, pmc) {
2235 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2236 type = MLD2_CHANGE_TO_EXCLUDE;
2237 else
2238 type = MLD2_ALLOW_NEW_SOURCES;
2239 skb = add_grec(skb, pmc, type, 0, 0, 1);
2240 }
2241 if (skb)
2242 mld_sendpack(skb);
2243}
2244
2245void ipv6_mc_dad_complete(struct inet6_dev *idev)
2246{
2247 mutex_lock(&idev->mc_lock);
2248 idev->mc_dad_count = idev->mc_qrv;
2249 if (idev->mc_dad_count) {
2250 mld_send_initial_cr(idev);
2251 idev->mc_dad_count--;
2252 if (idev->mc_dad_count)
2253 mld_dad_start_work(idev,
2254 unsolicited_report_interval(idev));
2255 }
2256 mutex_unlock(&idev->mc_lock);
2257}
2258
2259static void mld_dad_work(struct work_struct *work)
2260{
2261 struct inet6_dev *idev = container_of(to_delayed_work(work),
2262 struct inet6_dev,
2263 mc_dad_work);
2264 mutex_lock(&idev->mc_lock);
2265 mld_send_initial_cr(idev);
2266 if (idev->mc_dad_count) {
2267 idev->mc_dad_count--;
2268 if (idev->mc_dad_count)
2269 mld_dad_start_work(idev,
2270 unsolicited_report_interval(idev));
2271 }
2272 mutex_unlock(&idev->mc_lock);
2273 in6_dev_put(idev);
2274}
2275
2276/* called with mc_lock */
2277static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2278 const struct in6_addr *psfsrc)
2279{
2280 struct ip6_sf_list *psf, *psf_prev;
2281 int rv = 0;
2282
2283 psf_prev = NULL;
2284 for_each_psf_mclock(pmc, psf) {
2285 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2286 break;
2287 psf_prev = psf;
2288 }
2289 if (!psf || psf->sf_count[sfmode] == 0) {
2290 /* source filter not found, or count wrong => bug */
2291 return -ESRCH;
2292 }
2293 psf->sf_count[sfmode]--;
2294 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2295 struct inet6_dev *idev = pmc->idev;
2296
2297 /* no more filters for this source */
2298 if (psf_prev)
2299 rcu_assign_pointer(psf_prev->sf_next,
2300 mc_dereference(psf->sf_next, idev));
2301 else
2302 rcu_assign_pointer(pmc->mca_sources,
2303 mc_dereference(psf->sf_next, idev));
2304
2305 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2306 !mld_in_v1_mode(idev)) {
2307 psf->sf_crcount = idev->mc_qrv;
2308 rcu_assign_pointer(psf->sf_next,
2309 mc_dereference(pmc->mca_tomb, idev));
2310 rcu_assign_pointer(pmc->mca_tomb, psf);
2311 rv = 1;
2312 } else {
2313 kfree_rcu(psf, rcu);
2314 }
2315 }
2316 return rv;
2317}
2318
2319/* called with mc_lock */
2320static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2321 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2322 int delta)
2323{
2324 struct ifmcaddr6 *pmc;
2325 int changerec = 0;
2326 int i, err;
2327
2328 if (!idev)
2329 return -ENODEV;
2330
2331 for_each_mc_mclock(idev, pmc) {
2332 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2333 break;
2334 }
2335 if (!pmc)
2336 return -ESRCH;
2337
2338 sf_markstate(pmc);
2339 if (!delta) {
2340 if (!pmc->mca_sfcount[sfmode])
2341 return -EINVAL;
2342
2343 pmc->mca_sfcount[sfmode]--;
2344 }
2345 err = 0;
2346 for (i = 0; i < sfcount; i++) {
2347 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2348
2349 changerec |= rv > 0;
2350 if (!err && rv < 0)
2351 err = rv;
2352 }
2353 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2354 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2355 pmc->mca_sfcount[MCAST_INCLUDE]) {
2356 struct ip6_sf_list *psf;
2357
2358 /* filter mode change */
2359 pmc->mca_sfmode = MCAST_INCLUDE;
2360 pmc->mca_crcount = idev->mc_qrv;
2361 idev->mc_ifc_count = pmc->mca_crcount;
2362 for_each_psf_mclock(pmc, psf)
2363 psf->sf_crcount = 0;
2364 mld_ifc_event(pmc->idev);
2365 } else if (sf_setstate(pmc) || changerec) {
2366 mld_ifc_event(pmc->idev);
2367 }
2368
2369 return err;
2370}
2371
2372/*
2373 * Add multicast single-source filter to the interface list
2374 * called with mc_lock
2375 */
2376static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2377 const struct in6_addr *psfsrc)
2378{
2379 struct ip6_sf_list *psf, *psf_prev;
2380
2381 psf_prev = NULL;
2382 for_each_psf_mclock(pmc, psf) {
2383 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2384 break;
2385 psf_prev = psf;
2386 }
2387 if (!psf) {
2388 psf = kzalloc(sizeof(*psf), GFP_KERNEL);
2389 if (!psf)
2390 return -ENOBUFS;
2391
2392 psf->sf_addr = *psfsrc;
2393 if (psf_prev) {
2394 rcu_assign_pointer(psf_prev->sf_next, psf);
2395 } else {
2396 rcu_assign_pointer(pmc->mca_sources, psf);
2397 }
2398 }
2399 psf->sf_count[sfmode]++;
2400 return 0;
2401}
2402
2403/* called with mc_lock */
2404static void sf_markstate(struct ifmcaddr6 *pmc)
2405{
2406 struct ip6_sf_list *psf;
2407 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2408
2409 for_each_psf_mclock(pmc, psf) {
2410 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2411 psf->sf_oldin = mca_xcount ==
2412 psf->sf_count[MCAST_EXCLUDE] &&
2413 !psf->sf_count[MCAST_INCLUDE];
2414 } else {
2415 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2416 }
2417 }
2418}
2419
2420/* called with mc_lock */
2421static int sf_setstate(struct ifmcaddr6 *pmc)
2422{
2423 struct ip6_sf_list *psf, *dpsf;
2424 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2425 int qrv = pmc->idev->mc_qrv;
2426 int new_in, rv;
2427
2428 rv = 0;
2429 for_each_psf_mclock(pmc, psf) {
2430 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2431 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2432 !psf->sf_count[MCAST_INCLUDE];
2433 } else
2434 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2435 if (new_in) {
2436 if (!psf->sf_oldin) {
2437 struct ip6_sf_list *prev = NULL;
2438
2439 for_each_psf_tomb(pmc, dpsf) {
2440 if (ipv6_addr_equal(&dpsf->sf_addr,
2441 &psf->sf_addr))
2442 break;
2443 prev = dpsf;
2444 }
2445 if (dpsf) {
2446 if (prev)
2447 rcu_assign_pointer(prev->sf_next,
2448 mc_dereference(dpsf->sf_next,
2449 pmc->idev));
2450 else
2451 rcu_assign_pointer(pmc->mca_tomb,
2452 mc_dereference(dpsf->sf_next,
2453 pmc->idev));
2454 kfree_rcu(dpsf, rcu);
2455 }
2456 psf->sf_crcount = qrv;
2457 rv++;
2458 }
2459 } else if (psf->sf_oldin) {
2460 psf->sf_crcount = 0;
2461 /*
2462 * add or update "delete" records if an active filter
2463 * is now inactive
2464 */
2465
2466 for_each_psf_tomb(pmc, dpsf)
2467 if (ipv6_addr_equal(&dpsf->sf_addr,
2468 &psf->sf_addr))
2469 break;
2470 if (!dpsf) {
2471 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL);
2472 if (!dpsf)
2473 continue;
2474 *dpsf = *psf;
2475 rcu_assign_pointer(dpsf->sf_next,
2476 mc_dereference(pmc->mca_tomb, pmc->idev));
2477 rcu_assign_pointer(pmc->mca_tomb, dpsf);
2478 }
2479 dpsf->sf_crcount = qrv;
2480 rv++;
2481 }
2482 }
2483 return rv;
2484}
2485
2486/*
2487 * Add multicast source filter list to the interface list
2488 * called with mc_lock
2489 */
2490static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2491 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2492 int delta)
2493{
2494 struct ifmcaddr6 *pmc;
2495 int isexclude;
2496 int i, err;
2497
2498 if (!idev)
2499 return -ENODEV;
2500
2501 for_each_mc_mclock(idev, pmc) {
2502 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2503 break;
2504 }
2505 if (!pmc)
2506 return -ESRCH;
2507
2508 sf_markstate(pmc);
2509 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2510 if (!delta)
2511 pmc->mca_sfcount[sfmode]++;
2512 err = 0;
2513 for (i = 0; i < sfcount; i++) {
2514 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2515 if (err)
2516 break;
2517 }
2518 if (err) {
2519 int j;
2520
2521 if (!delta)
2522 pmc->mca_sfcount[sfmode]--;
2523 for (j = 0; j < i; j++)
2524 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2525 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2526 struct ip6_sf_list *psf;
2527
2528 /* filter mode change */
2529 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2530 pmc->mca_sfmode = MCAST_EXCLUDE;
2531 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2532 pmc->mca_sfmode = MCAST_INCLUDE;
2533 /* else no filters; keep old mode for reports */
2534
2535 pmc->mca_crcount = idev->mc_qrv;
2536 idev->mc_ifc_count = pmc->mca_crcount;
2537 for_each_psf_mclock(pmc, psf)
2538 psf->sf_crcount = 0;
2539 mld_ifc_event(idev);
2540 } else if (sf_setstate(pmc)) {
2541 mld_ifc_event(idev);
2542 }
2543 return err;
2544}
2545
2546/* called with mc_lock */
2547static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2548{
2549 struct ip6_sf_list *psf, *nextpsf;
2550
2551 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev);
2552 psf;
2553 psf = nextpsf) {
2554 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2555 kfree_rcu(psf, rcu);
2556 }
2557 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
2558 for (psf = mc_dereference(pmc->mca_sources, pmc->idev);
2559 psf;
2560 psf = nextpsf) {
2561 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2562 kfree_rcu(psf, rcu);
2563 }
2564 RCU_INIT_POINTER(pmc->mca_sources, NULL);
2565 pmc->mca_sfmode = MCAST_EXCLUDE;
2566 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2567 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2568}
2569
2570/* called with mc_lock */
2571static void igmp6_join_group(struct ifmcaddr6 *ma)
2572{
2573 unsigned long delay;
2574
2575 if (ma->mca_flags & MAF_NOREPORT)
2576 return;
2577
2578 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2579
2580 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2581
2582 if (cancel_delayed_work(&ma->mca_work)) {
2583 refcount_dec(&ma->mca_refcnt);
2584 delay = ma->mca_work.timer.expires - jiffies;
2585 }
2586
2587 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
2588 refcount_inc(&ma->mca_refcnt);
2589 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2590}
2591
2592static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2593 struct inet6_dev *idev)
2594{
2595 struct ip6_sf_socklist *psl;
2596 int err;
2597
2598 psl = sock_dereference(iml->sflist, sk);
2599
2600 if (idev)
2601 mutex_lock(&idev->mc_lock);
2602
2603 if (!psl) {
2604 /* any-source empty exclude case */
2605 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2606 } else {
2607 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2608 psl->sl_count, psl->sl_addr, 0);
2609 RCU_INIT_POINTER(iml->sflist, NULL);
2610 atomic_sub(IP6_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2611 kfree_rcu(psl, rcu);
2612 }
2613
2614 if (idev)
2615 mutex_unlock(&idev->mc_lock);
2616
2617 return err;
2618}
2619
2620/* called with mc_lock */
2621static void igmp6_leave_group(struct ifmcaddr6 *ma)
2622{
2623 if (mld_in_v1_mode(ma->idev)) {
2624 if (ma->mca_flags & MAF_LAST_REPORTER) {
2625 igmp6_send(&ma->mca_addr, ma->idev->dev,
2626 ICMPV6_MGM_REDUCTION);
2627 }
2628 } else {
2629 mld_add_delrec(ma->idev, ma);
2630 mld_ifc_event(ma->idev);
2631 }
2632}
2633
2634static void mld_gq_work(struct work_struct *work)
2635{
2636 struct inet6_dev *idev = container_of(to_delayed_work(work),
2637 struct inet6_dev,
2638 mc_gq_work);
2639
2640 mutex_lock(&idev->mc_lock);
2641 mld_send_report(idev, NULL);
2642 idev->mc_gq_running = 0;
2643 mutex_unlock(&idev->mc_lock);
2644
2645 in6_dev_put(idev);
2646}
2647
2648static void mld_ifc_work(struct work_struct *work)
2649{
2650 struct inet6_dev *idev = container_of(to_delayed_work(work),
2651 struct inet6_dev,
2652 mc_ifc_work);
2653
2654 mutex_lock(&idev->mc_lock);
2655 mld_send_cr(idev);
2656
2657 if (idev->mc_ifc_count) {
2658 idev->mc_ifc_count--;
2659 if (idev->mc_ifc_count)
2660 mld_ifc_start_work(idev,
2661 unsolicited_report_interval(idev));
2662 }
2663 mutex_unlock(&idev->mc_lock);
2664 in6_dev_put(idev);
2665}
2666
2667/* called with mc_lock */
2668static void mld_ifc_event(struct inet6_dev *idev)
2669{
2670 if (mld_in_v1_mode(idev))
2671 return;
2672
2673 idev->mc_ifc_count = idev->mc_qrv;
2674 mld_ifc_start_work(idev, 1);
2675}
2676
2677static void mld_mca_work(struct work_struct *work)
2678{
2679 struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2680 struct ifmcaddr6, mca_work);
2681
2682 mutex_lock(&ma->idev->mc_lock);
2683 if (mld_in_v1_mode(ma->idev))
2684 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2685 else
2686 mld_send_report(ma->idev, ma);
2687 ma->mca_flags |= MAF_LAST_REPORTER;
2688 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2689 mutex_unlock(&ma->idev->mc_lock);
2690
2691 ma_put(ma);
2692}
2693
2694/* Device changing type */
2695
2696void ipv6_mc_unmap(struct inet6_dev *idev)
2697{
2698 struct ifmcaddr6 *i;
2699
2700 /* Install multicast list, except for all-nodes (already installed) */
2701
2702 mutex_lock(&idev->mc_lock);
2703 for_each_mc_mclock(idev, i)
2704 igmp6_group_dropped(i);
2705 mutex_unlock(&idev->mc_lock);
2706}
2707
2708void ipv6_mc_remap(struct inet6_dev *idev)
2709{
2710 ipv6_mc_up(idev);
2711}
2712
2713/* Device going down */
2714void ipv6_mc_down(struct inet6_dev *idev)
2715{
2716 struct ifmcaddr6 *i;
2717
2718 mutex_lock(&idev->mc_lock);
2719 /* Withdraw multicast list */
2720 for_each_mc_mclock(idev, i)
2721 igmp6_group_dropped(i);
2722 mutex_unlock(&idev->mc_lock);
2723
2724 /* Should stop work after group drop. or we will
2725 * start work again in mld_ifc_event()
2726 */
2727 synchronize_net();
2728 mld_query_stop_work(idev);
2729 mld_report_stop_work(idev);
2730 mld_ifc_stop_work(idev);
2731 mld_gq_stop_work(idev);
2732 mld_dad_stop_work(idev);
2733}
2734
2735static void ipv6_mc_reset(struct inet6_dev *idev)
2736{
2737 idev->mc_qrv = sysctl_mld_qrv;
2738 idev->mc_qi = MLD_QI_DEFAULT;
2739 idev->mc_qri = MLD_QRI_DEFAULT;
2740 idev->mc_v1_seen = 0;
2741 idev->mc_maxdelay = unsolicited_report_interval(idev);
2742}
2743
2744/* Device going up */
2745
2746void ipv6_mc_up(struct inet6_dev *idev)
2747{
2748 struct ifmcaddr6 *i;
2749
2750 /* Install multicast list, except for all-nodes (already installed) */
2751
2752 ipv6_mc_reset(idev);
2753 mutex_lock(&idev->mc_lock);
2754 for_each_mc_mclock(idev, i) {
2755 mld_del_delrec(idev, i);
2756 igmp6_group_added(i);
2757 }
2758 mutex_unlock(&idev->mc_lock);
2759}
2760
2761/* IPv6 device initialization. */
2762
2763void ipv6_mc_init_dev(struct inet6_dev *idev)
2764{
2765 idev->mc_gq_running = 0;
2766 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work);
2767 RCU_INIT_POINTER(idev->mc_tomb, NULL);
2768 idev->mc_ifc_count = 0;
2769 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work);
2770 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work);
2771 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work);
2772 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work);
2773 skb_queue_head_init(&idev->mc_query_queue);
2774 skb_queue_head_init(&idev->mc_report_queue);
2775 spin_lock_init(&idev->mc_query_lock);
2776 spin_lock_init(&idev->mc_report_lock);
2777 mutex_init(&idev->mc_lock);
2778 ipv6_mc_reset(idev);
2779}
2780
2781/*
2782 * Device is about to be destroyed: clean up.
2783 */
2784
2785void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2786{
2787 struct ifmcaddr6 *i;
2788
2789 /* Deactivate works */
2790 ipv6_mc_down(idev);
2791 mutex_lock(&idev->mc_lock);
2792 mld_clear_delrec(idev);
2793 mutex_unlock(&idev->mc_lock);
2794 mld_clear_query(idev);
2795 mld_clear_report(idev);
2796
2797 /* Delete all-nodes address. */
2798 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2799 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2800 * fail.
2801 */
2802 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2803
2804 if (idev->cnf.forwarding)
2805 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2806
2807 mutex_lock(&idev->mc_lock);
2808 while ((i = mc_dereference(idev->mc_list, idev))) {
2809 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev));
2810
2811 ip6_mc_clear_src(i);
2812 ma_put(i);
2813 }
2814 mutex_unlock(&idev->mc_lock);
2815}
2816
2817static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2818{
2819 struct ifmcaddr6 *pmc;
2820
2821 ASSERT_RTNL();
2822
2823 mutex_lock(&idev->mc_lock);
2824 if (mld_in_v1_mode(idev)) {
2825 for_each_mc_mclock(idev, pmc)
2826 igmp6_join_group(pmc);
2827 } else {
2828 mld_send_report(idev, NULL);
2829 }
2830 mutex_unlock(&idev->mc_lock);
2831}
2832
2833static int ipv6_mc_netdev_event(struct notifier_block *this,
2834 unsigned long event,
2835 void *ptr)
2836{
2837 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2838 struct inet6_dev *idev = __in6_dev_get(dev);
2839
2840 switch (event) {
2841 case NETDEV_RESEND_IGMP:
2842 if (idev)
2843 ipv6_mc_rejoin_groups(idev);
2844 break;
2845 default:
2846 break;
2847 }
2848
2849 return NOTIFY_DONE;
2850}
2851
2852static struct notifier_block igmp6_netdev_notifier = {
2853 .notifier_call = ipv6_mc_netdev_event,
2854};
2855
2856#ifdef CONFIG_PROC_FS
2857struct igmp6_mc_iter_state {
2858 struct seq_net_private p;
2859 struct net_device *dev;
2860 struct inet6_dev *idev;
2861};
2862
2863#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2864
2865static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2866{
2867 struct ifmcaddr6 *im = NULL;
2868 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2869 struct net *net = seq_file_net(seq);
2870
2871 state->idev = NULL;
2872 for_each_netdev_rcu(net, state->dev) {
2873 struct inet6_dev *idev;
2874 idev = __in6_dev_get(state->dev);
2875 if (!idev)
2876 continue;
2877
2878 im = rcu_dereference(idev->mc_list);
2879 if (im) {
2880 state->idev = idev;
2881 break;
2882 }
2883 }
2884 return im;
2885}
2886
2887static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2888{
2889 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2890
2891 im = rcu_dereference(im->next);
2892 while (!im) {
2893 state->dev = next_net_device_rcu(state->dev);
2894 if (!state->dev) {
2895 state->idev = NULL;
2896 break;
2897 }
2898 state->idev = __in6_dev_get(state->dev);
2899 if (!state->idev)
2900 continue;
2901 im = rcu_dereference(state->idev->mc_list);
2902 }
2903 return im;
2904}
2905
2906static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2907{
2908 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2909 if (im)
2910 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2911 --pos;
2912 return pos ? NULL : im;
2913}
2914
2915static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2916 __acquires(RCU)
2917{
2918 rcu_read_lock();
2919 return igmp6_mc_get_idx(seq, *pos);
2920}
2921
2922static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2923{
2924 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2925
2926 ++*pos;
2927 return im;
2928}
2929
2930static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2931 __releases(RCU)
2932{
2933 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2934
2935 if (likely(state->idev))
2936 state->idev = NULL;
2937 state->dev = NULL;
2938 rcu_read_unlock();
2939}
2940
2941static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2942{
2943 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2944 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2945
2946 seq_printf(seq,
2947 "%-4d %-15s %pi6 %5d %08X %ld\n",
2948 state->dev->ifindex, state->dev->name,
2949 &im->mca_addr,
2950 im->mca_users, im->mca_flags,
2951 (im->mca_flags & MAF_TIMER_RUNNING) ?
2952 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0);
2953 return 0;
2954}
2955
2956static const struct seq_operations igmp6_mc_seq_ops = {
2957 .start = igmp6_mc_seq_start,
2958 .next = igmp6_mc_seq_next,
2959 .stop = igmp6_mc_seq_stop,
2960 .show = igmp6_mc_seq_show,
2961};
2962
2963struct igmp6_mcf_iter_state {
2964 struct seq_net_private p;
2965 struct net_device *dev;
2966 struct inet6_dev *idev;
2967 struct ifmcaddr6 *im;
2968};
2969
2970#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2971
2972static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2973{
2974 struct ip6_sf_list *psf = NULL;
2975 struct ifmcaddr6 *im = NULL;
2976 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2977 struct net *net = seq_file_net(seq);
2978
2979 state->idev = NULL;
2980 state->im = NULL;
2981 for_each_netdev_rcu(net, state->dev) {
2982 struct inet6_dev *idev;
2983 idev = __in6_dev_get(state->dev);
2984 if (unlikely(idev == NULL))
2985 continue;
2986
2987 im = rcu_dereference(idev->mc_list);
2988 if (likely(im)) {
2989 psf = rcu_dereference(im->mca_sources);
2990 if (likely(psf)) {
2991 state->im = im;
2992 state->idev = idev;
2993 break;
2994 }
2995 }
2996 }
2997 return psf;
2998}
2999
3000static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
3001{
3002 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3003
3004 psf = rcu_dereference(psf->sf_next);
3005 while (!psf) {
3006 state->im = rcu_dereference(state->im->next);
3007 while (!state->im) {
3008 state->dev = next_net_device_rcu(state->dev);
3009 if (!state->dev) {
3010 state->idev = NULL;
3011 goto out;
3012 }
3013 state->idev = __in6_dev_get(state->dev);
3014 if (!state->idev)
3015 continue;
3016 state->im = rcu_dereference(state->idev->mc_list);
3017 }
3018 if (!state->im)
3019 break;
3020 psf = rcu_dereference(state->im->mca_sources);
3021 }
3022out:
3023 return psf;
3024}
3025
3026static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3027{
3028 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3029 if (psf)
3030 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3031 --pos;
3032 return pos ? NULL : psf;
3033}
3034
3035static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3036 __acquires(RCU)
3037{
3038 rcu_read_lock();
3039 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3040}
3041
3042static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3043{
3044 struct ip6_sf_list *psf;
3045 if (v == SEQ_START_TOKEN)
3046 psf = igmp6_mcf_get_first(seq);
3047 else
3048 psf = igmp6_mcf_get_next(seq, v);
3049 ++*pos;
3050 return psf;
3051}
3052
3053static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
3054 __releases(RCU)
3055{
3056 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3057
3058 if (likely(state->im))
3059 state->im = NULL;
3060 if (likely(state->idev))
3061 state->idev = NULL;
3062
3063 state->dev = NULL;
3064 rcu_read_unlock();
3065}
3066
3067static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3068{
3069 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3070 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3071
3072 if (v == SEQ_START_TOKEN) {
3073 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
3074 } else {
3075 seq_printf(seq,
3076 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
3077 state->dev->ifindex, state->dev->name,
3078 &state->im->mca_addr,
3079 &psf->sf_addr,
3080 psf->sf_count[MCAST_INCLUDE],
3081 psf->sf_count[MCAST_EXCLUDE]);
3082 }
3083 return 0;
3084}
3085
3086static const struct seq_operations igmp6_mcf_seq_ops = {
3087 .start = igmp6_mcf_seq_start,
3088 .next = igmp6_mcf_seq_next,
3089 .stop = igmp6_mcf_seq_stop,
3090 .show = igmp6_mcf_seq_show,
3091};
3092
3093static int __net_init igmp6_proc_init(struct net *net)
3094{
3095 int err;
3096
3097 err = -ENOMEM;
3098 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3099 sizeof(struct igmp6_mc_iter_state)))
3100 goto out;
3101 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3102 &igmp6_mcf_seq_ops,
3103 sizeof(struct igmp6_mcf_iter_state)))
3104 goto out_proc_net_igmp6;
3105
3106 err = 0;
3107out:
3108 return err;
3109
3110out_proc_net_igmp6:
3111 remove_proc_entry("igmp6", net->proc_net);
3112 goto out;
3113}
3114
3115static void __net_exit igmp6_proc_exit(struct net *net)
3116{
3117 remove_proc_entry("mcfilter6", net->proc_net);
3118 remove_proc_entry("igmp6", net->proc_net);
3119}
3120#else
3121static inline int igmp6_proc_init(struct net *net)
3122{
3123 return 0;
3124}
3125static inline void igmp6_proc_exit(struct net *net)
3126{
3127}
3128#endif
3129
3130static int __net_init igmp6_net_init(struct net *net)
3131{
3132 int err;
3133
3134 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3135 SOCK_RAW, IPPROTO_ICMPV6, net);
3136 if (err < 0) {
3137 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
3138 err);
3139 goto out;
3140 }
3141
3142 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
3143 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
3144
3145 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3146 SOCK_RAW, IPPROTO_ICMPV6, net);
3147 if (err < 0) {
3148 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3149 err);
3150 goto out_sock_create;
3151 }
3152
3153 err = igmp6_proc_init(net);
3154 if (err)
3155 goto out_sock_create_autojoin;
3156
3157 return 0;
3158
3159out_sock_create_autojoin:
3160 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3161out_sock_create:
3162 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3163out:
3164 return err;
3165}
3166
3167static void __net_exit igmp6_net_exit(struct net *net)
3168{
3169 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3170 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3171 igmp6_proc_exit(net);
3172}
3173
3174static struct pernet_operations igmp6_net_ops = {
3175 .init = igmp6_net_init,
3176 .exit = igmp6_net_exit,
3177};
3178
3179int __init igmp6_init(void)
3180{
3181 int err;
3182
3183 err = register_pernet_subsys(&igmp6_net_ops);
3184 if (err)
3185 return err;
3186
3187 mld_wq = create_workqueue("mld");
3188 if (!mld_wq) {
3189 unregister_pernet_subsys(&igmp6_net_ops);
3190 return -ENOMEM;
3191 }
3192
3193 return err;
3194}
3195
3196int __init igmp6_late_init(void)
3197{
3198 return register_netdevice_notifier(&igmp6_netdev_notifier);
3199}
3200
3201void igmp6_cleanup(void)
3202{
3203 unregister_pernet_subsys(&igmp6_net_ops);
3204 destroy_workqueue(mld_wq);
3205}
3206
3207void igmp6_late_cleanup(void)
3208{
3209 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3210}
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(struct sock *sk, const struct in6_addr *mc_addr,
631 const struct in6_addr *src_addr)
632{
633 struct ipv6_pinfo *np = inet6_sk(sk);
634 struct ipv6_mc_socklist *mc;
635 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 np->mc_all;
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(struct sock *sk, struct sk_buff *skb,
1703 struct net_device *dev,
1704 const struct in6_addr *saddr,
1705 const struct in6_addr *daddr,
1706 int proto, int len)
1707{
1708 struct ipv6hdr *hdr;
1709
1710 skb->protocol = htons(ETH_P_IPV6);
1711 skb->dev = dev;
1712
1713 skb_reset_network_header(skb);
1714 skb_put(skb, sizeof(struct ipv6hdr));
1715 hdr = ipv6_hdr(skb);
1716
1717 ip6_flow_hdr(hdr, 0, 0);
1718
1719 hdr->payload_len = htons(len);
1720 hdr->nexthdr = proto;
1721 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1722
1723 hdr->saddr = *saddr;
1724 hdr->daddr = *daddr;
1725}
1726
1727static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1728{
1729 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1730 2, 0, 0, IPV6_TLV_PADN, 0 };
1731 struct net_device *dev = idev->dev;
1732 int hlen = LL_RESERVED_SPACE(dev);
1733 int tlen = dev->needed_tailroom;
1734 struct net *net = dev_net(dev);
1735 const struct in6_addr *saddr;
1736 struct in6_addr addr_buf;
1737 struct mld2_report *pmr;
1738 struct sk_buff *skb;
1739 unsigned int size;
1740 struct sock *sk;
1741 int err;
1742
1743 sk = net->ipv6.igmp_sk;
1744 /* we assume size > sizeof(ra) here
1745 * Also try to not allocate high-order pages for big MTU
1746 */
1747 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
1748 skb = sock_alloc_send_skb(sk, size, 1, &err);
1749 if (!skb)
1750 return NULL;
1751
1752 skb->priority = TC_PRIO_CONTROL;
1753 skb_reserve(skb, hlen);
1754 skb_tailroom_reserve(skb, mtu, tlen);
1755
1756 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1757 /* <draft-ietf-magma-mld-source-05.txt>:
1758 * use unspecified address as the source address
1759 * when a valid link-local address is not available.
1760 */
1761 saddr = &in6addr_any;
1762 } else
1763 saddr = &addr_buf;
1764
1765 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1766
1767 skb_put_data(skb, ra, sizeof(ra));
1768
1769 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1770 skb_put(skb, sizeof(*pmr));
1771 pmr = (struct mld2_report *)skb_transport_header(skb);
1772 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1773 pmr->mld2r_resv1 = 0;
1774 pmr->mld2r_cksum = 0;
1775 pmr->mld2r_resv2 = 0;
1776 pmr->mld2r_ngrec = 0;
1777 return skb;
1778}
1779
1780static void mld_sendpack(struct sk_buff *skb)
1781{
1782 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1783 struct mld2_report *pmr =
1784 (struct mld2_report *)skb_transport_header(skb);
1785 int payload_len, mldlen;
1786 struct inet6_dev *idev;
1787 struct net *net = dev_net(skb->dev);
1788 int err;
1789 struct flowi6 fl6;
1790 struct dst_entry *dst;
1791
1792 rcu_read_lock();
1793 idev = __in6_dev_get(skb->dev);
1794 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1795
1796 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1797 sizeof(*pip6);
1798 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1799 pip6->payload_len = htons(payload_len);
1800
1801 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1802 IPPROTO_ICMPV6,
1803 csum_partial(skb_transport_header(skb),
1804 mldlen, 0));
1805
1806 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1807 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1808 skb->dev->ifindex);
1809 dst = icmp6_dst_alloc(skb->dev, &fl6);
1810
1811 err = 0;
1812 if (IS_ERR(dst)) {
1813 err = PTR_ERR(dst);
1814 dst = NULL;
1815 }
1816 skb_dst_set(skb, dst);
1817 if (err)
1818 goto err_out;
1819
1820 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1821 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1822 dst_output);
1823out:
1824 if (!err) {
1825 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1826 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1827 } else {
1828 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1829 }
1830
1831 rcu_read_unlock();
1832 return;
1833
1834err_out:
1835 kfree_skb(skb);
1836 goto out;
1837}
1838
1839static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1840{
1841 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1842}
1843
1844static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1845 int type, struct mld2_grec **ppgr, unsigned int mtu)
1846{
1847 struct mld2_report *pmr;
1848 struct mld2_grec *pgr;
1849
1850 if (!skb) {
1851 skb = mld_newpack(pmc->idev, mtu);
1852 if (!skb)
1853 return NULL;
1854 }
1855 pgr = skb_put(skb, sizeof(struct mld2_grec));
1856 pgr->grec_type = type;
1857 pgr->grec_auxwords = 0;
1858 pgr->grec_nsrcs = 0;
1859 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1860 pmr = (struct mld2_report *)skb_transport_header(skb);
1861 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1862 *ppgr = pgr;
1863 return skb;
1864}
1865
1866#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1867
1868/* called with mc_lock */
1869static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1870 int type, int gdeleted, int sdeleted,
1871 int crsend)
1872{
1873 struct ip6_sf_list *psf, *psf_prev, *psf_next;
1874 int scount, stotal, first, isquery, truncate;
1875 struct ip6_sf_list __rcu **psf_list;
1876 struct inet6_dev *idev = pmc->idev;
1877 struct net_device *dev = idev->dev;
1878 struct mld2_grec *pgr = NULL;
1879 struct mld2_report *pmr;
1880 unsigned int mtu;
1881
1882 if (pmc->mca_flags & MAF_NOREPORT)
1883 return skb;
1884
1885 mtu = READ_ONCE(dev->mtu);
1886 if (mtu < IPV6_MIN_MTU)
1887 return skb;
1888
1889 isquery = type == MLD2_MODE_IS_INCLUDE ||
1890 type == MLD2_MODE_IS_EXCLUDE;
1891 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1892 type == MLD2_CHANGE_TO_EXCLUDE;
1893
1894 stotal = scount = 0;
1895
1896 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1897
1898 if (!rcu_access_pointer(*psf_list))
1899 goto empty_source;
1900
1901 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1902
1903 /* EX and TO_EX get a fresh packet, if needed */
1904 if (truncate) {
1905 if (pmr && pmr->mld2r_ngrec &&
1906 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1907 if (skb)
1908 mld_sendpack(skb);
1909 skb = mld_newpack(idev, mtu);
1910 }
1911 }
1912 first = 1;
1913 psf_prev = NULL;
1914 for (psf = mc_dereference(*psf_list, idev);
1915 psf;
1916 psf = psf_next) {
1917 struct in6_addr *psrc;
1918
1919 psf_next = mc_dereference(psf->sf_next, idev);
1920
1921 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1922 psf_prev = psf;
1923 continue;
1924 }
1925
1926 /* Based on RFC3810 6.1. Should not send source-list change
1927 * records when there is a filter mode change.
1928 */
1929 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1930 (!gdeleted && pmc->mca_crcount)) &&
1931 (type == MLD2_ALLOW_NEW_SOURCES ||
1932 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1933 goto decrease_sf_crcount;
1934
1935 /* clear marks on query responses */
1936 if (isquery)
1937 psf->sf_gsresp = 0;
1938
1939 if (AVAILABLE(skb) < sizeof(*psrc) +
1940 first*sizeof(struct mld2_grec)) {
1941 if (truncate && !first)
1942 break; /* truncate these */
1943 if (pgr)
1944 pgr->grec_nsrcs = htons(scount);
1945 if (skb)
1946 mld_sendpack(skb);
1947 skb = mld_newpack(idev, mtu);
1948 first = 1;
1949 scount = 0;
1950 }
1951 if (first) {
1952 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1953 first = 0;
1954 }
1955 if (!skb)
1956 return NULL;
1957 psrc = skb_put(skb, sizeof(*psrc));
1958 *psrc = psf->sf_addr;
1959 scount++; stotal++;
1960 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1961 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1962decrease_sf_crcount:
1963 psf->sf_crcount--;
1964 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1965 if (psf_prev)
1966 rcu_assign_pointer(psf_prev->sf_next,
1967 mc_dereference(psf->sf_next, idev));
1968 else
1969 rcu_assign_pointer(*psf_list,
1970 mc_dereference(psf->sf_next, idev));
1971 kfree_rcu(psf, rcu);
1972 continue;
1973 }
1974 }
1975 psf_prev = psf;
1976 }
1977
1978empty_source:
1979 if (!stotal) {
1980 if (type == MLD2_ALLOW_NEW_SOURCES ||
1981 type == MLD2_BLOCK_OLD_SOURCES)
1982 return skb;
1983 if (pmc->mca_crcount || isquery || crsend) {
1984 /* make sure we have room for group header */
1985 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1986 mld_sendpack(skb);
1987 skb = NULL; /* add_grhead will get a new one */
1988 }
1989 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1990 }
1991 }
1992 if (pgr)
1993 pgr->grec_nsrcs = htons(scount);
1994
1995 if (isquery)
1996 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1997 return skb;
1998}
1999
2000/* called with mc_lock */
2001static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2002{
2003 struct sk_buff *skb = NULL;
2004 int type;
2005
2006 if (!pmc) {
2007 for_each_mc_mclock(idev, pmc) {
2008 if (pmc->mca_flags & MAF_NOREPORT)
2009 continue;
2010 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2011 type = MLD2_MODE_IS_EXCLUDE;
2012 else
2013 type = MLD2_MODE_IS_INCLUDE;
2014 skb = add_grec(skb, pmc, type, 0, 0, 0);
2015 }
2016 } else {
2017 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2018 type = MLD2_MODE_IS_EXCLUDE;
2019 else
2020 type = MLD2_MODE_IS_INCLUDE;
2021 skb = add_grec(skb, pmc, type, 0, 0, 0);
2022 }
2023 if (skb)
2024 mld_sendpack(skb);
2025}
2026
2027/*
2028 * remove zero-count source records from a source filter list
2029 * called with mc_lock
2030 */
2031static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
2032{
2033 struct ip6_sf_list *psf_prev, *psf_next, *psf;
2034
2035 psf_prev = NULL;
2036 for (psf = mc_dereference(*ppsf, idev);
2037 psf;
2038 psf = psf_next) {
2039 psf_next = mc_dereference(psf->sf_next, idev);
2040 if (psf->sf_crcount == 0) {
2041 if (psf_prev)
2042 rcu_assign_pointer(psf_prev->sf_next,
2043 mc_dereference(psf->sf_next, idev));
2044 else
2045 rcu_assign_pointer(*ppsf,
2046 mc_dereference(psf->sf_next, idev));
2047 kfree_rcu(psf, rcu);
2048 } else {
2049 psf_prev = psf;
2050 }
2051 }
2052}
2053
2054/* called with mc_lock */
2055static void mld_send_cr(struct inet6_dev *idev)
2056{
2057 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2058 struct sk_buff *skb = NULL;
2059 int type, dtype;
2060
2061 /* deleted MCA's */
2062 pmc_prev = NULL;
2063 for (pmc = mc_dereference(idev->mc_tomb, idev);
2064 pmc;
2065 pmc = pmc_next) {
2066 pmc_next = mc_dereference(pmc->next, idev);
2067 if (pmc->mca_sfmode == MCAST_INCLUDE) {
2068 type = MLD2_BLOCK_OLD_SOURCES;
2069 dtype = MLD2_BLOCK_OLD_SOURCES;
2070 skb = add_grec(skb, pmc, type, 1, 0, 0);
2071 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
2072 }
2073 if (pmc->mca_crcount) {
2074 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2075 type = MLD2_CHANGE_TO_INCLUDE;
2076 skb = add_grec(skb, pmc, type, 1, 0, 0);
2077 }
2078 pmc->mca_crcount--;
2079 if (pmc->mca_crcount == 0) {
2080 mld_clear_zeros(&pmc->mca_tomb, idev);
2081 mld_clear_zeros(&pmc->mca_sources, idev);
2082 }
2083 }
2084 if (pmc->mca_crcount == 0 &&
2085 !rcu_access_pointer(pmc->mca_tomb) &&
2086 !rcu_access_pointer(pmc->mca_sources)) {
2087 if (pmc_prev)
2088 rcu_assign_pointer(pmc_prev->next, pmc_next);
2089 else
2090 rcu_assign_pointer(idev->mc_tomb, pmc_next);
2091 in6_dev_put(pmc->idev);
2092 kfree_rcu(pmc, rcu);
2093 } else
2094 pmc_prev = pmc;
2095 }
2096
2097 /* change recs */
2098 for_each_mc_mclock(idev, pmc) {
2099 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2100 type = MLD2_BLOCK_OLD_SOURCES;
2101 dtype = MLD2_ALLOW_NEW_SOURCES;
2102 } else {
2103 type = MLD2_ALLOW_NEW_SOURCES;
2104 dtype = MLD2_BLOCK_OLD_SOURCES;
2105 }
2106 skb = add_grec(skb, pmc, type, 0, 0, 0);
2107 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
2108
2109 /* filter mode changes */
2110 if (pmc->mca_crcount) {
2111 if (pmc->mca_sfmode == MCAST_EXCLUDE)
2112 type = MLD2_CHANGE_TO_EXCLUDE;
2113 else
2114 type = MLD2_CHANGE_TO_INCLUDE;
2115 skb = add_grec(skb, pmc, type, 0, 0, 0);
2116 pmc->mca_crcount--;
2117 }
2118 }
2119 if (!skb)
2120 return;
2121 (void) mld_sendpack(skb);
2122}
2123
2124static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2125{
2126 struct net *net = dev_net(dev);
2127 struct sock *sk = net->ipv6.igmp_sk;
2128 struct inet6_dev *idev;
2129 struct sk_buff *skb;
2130 struct mld_msg *hdr;
2131 const struct in6_addr *snd_addr, *saddr;
2132 struct in6_addr addr_buf;
2133 int hlen = LL_RESERVED_SPACE(dev);
2134 int tlen = dev->needed_tailroom;
2135 int err, len, payload_len, full_len;
2136 u8 ra[8] = { IPPROTO_ICMPV6, 0,
2137 IPV6_TLV_ROUTERALERT, 2, 0, 0,
2138 IPV6_TLV_PADN, 0 };
2139 struct flowi6 fl6;
2140 struct dst_entry *dst;
2141
2142 if (type == ICMPV6_MGM_REDUCTION)
2143 snd_addr = &in6addr_linklocal_allrouters;
2144 else
2145 snd_addr = addr;
2146
2147 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2148 payload_len = len + sizeof(ra);
2149 full_len = sizeof(struct ipv6hdr) + payload_len;
2150
2151 rcu_read_lock();
2152 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2153 IPSTATS_MIB_OUT, full_len);
2154 rcu_read_unlock();
2155
2156 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2157
2158 if (!skb) {
2159 rcu_read_lock();
2160 IP6_INC_STATS(net, __in6_dev_get(dev),
2161 IPSTATS_MIB_OUTDISCARDS);
2162 rcu_read_unlock();
2163 return;
2164 }
2165 skb->priority = TC_PRIO_CONTROL;
2166 skb_reserve(skb, hlen);
2167
2168 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2169 /* <draft-ietf-magma-mld-source-05.txt>:
2170 * use unspecified address as the source address
2171 * when a valid link-local address is not available.
2172 */
2173 saddr = &in6addr_any;
2174 } else
2175 saddr = &addr_buf;
2176
2177 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2178
2179 skb_put_data(skb, ra, sizeof(ra));
2180
2181 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2182 hdr->mld_type = type;
2183 hdr->mld_mca = *addr;
2184
2185 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2186 IPPROTO_ICMPV6,
2187 csum_partial(hdr, len, 0));
2188
2189 rcu_read_lock();
2190 idev = __in6_dev_get(skb->dev);
2191
2192 icmpv6_flow_init(sk, &fl6, type,
2193 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2194 skb->dev->ifindex);
2195 dst = icmp6_dst_alloc(skb->dev, &fl6);
2196 if (IS_ERR(dst)) {
2197 err = PTR_ERR(dst);
2198 goto err_out;
2199 }
2200
2201 skb_dst_set(skb, dst);
2202 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2203 net, sk, skb, NULL, skb->dev,
2204 dst_output);
2205out:
2206 if (!err) {
2207 ICMP6MSGOUT_INC_STATS(net, idev, type);
2208 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2209 } else
2210 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2211
2212 rcu_read_unlock();
2213 return;
2214
2215err_out:
2216 kfree_skb(skb);
2217 goto out;
2218}
2219
2220/* called with mc_lock */
2221static void mld_send_initial_cr(struct inet6_dev *idev)
2222{
2223 struct sk_buff *skb;
2224 struct ifmcaddr6 *pmc;
2225 int type;
2226
2227 if (mld_in_v1_mode(idev))
2228 return;
2229
2230 skb = NULL;
2231 for_each_mc_mclock(idev, pmc) {
2232 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2233 type = MLD2_CHANGE_TO_EXCLUDE;
2234 else
2235 type = MLD2_ALLOW_NEW_SOURCES;
2236 skb = add_grec(skb, pmc, type, 0, 0, 1);
2237 }
2238 if (skb)
2239 mld_sendpack(skb);
2240}
2241
2242void ipv6_mc_dad_complete(struct inet6_dev *idev)
2243{
2244 mutex_lock(&idev->mc_lock);
2245 idev->mc_dad_count = idev->mc_qrv;
2246 if (idev->mc_dad_count) {
2247 mld_send_initial_cr(idev);
2248 idev->mc_dad_count--;
2249 if (idev->mc_dad_count)
2250 mld_dad_start_work(idev,
2251 unsolicited_report_interval(idev));
2252 }
2253 mutex_unlock(&idev->mc_lock);
2254}
2255
2256static void mld_dad_work(struct work_struct *work)
2257{
2258 struct inet6_dev *idev = container_of(to_delayed_work(work),
2259 struct inet6_dev,
2260 mc_dad_work);
2261 mutex_lock(&idev->mc_lock);
2262 mld_send_initial_cr(idev);
2263 if (idev->mc_dad_count) {
2264 idev->mc_dad_count--;
2265 if (idev->mc_dad_count)
2266 mld_dad_start_work(idev,
2267 unsolicited_report_interval(idev));
2268 }
2269 mutex_unlock(&idev->mc_lock);
2270 in6_dev_put(idev);
2271}
2272
2273/* called with mc_lock */
2274static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2275 const struct in6_addr *psfsrc)
2276{
2277 struct ip6_sf_list *psf, *psf_prev;
2278 int rv = 0;
2279
2280 psf_prev = NULL;
2281 for_each_psf_mclock(pmc, psf) {
2282 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2283 break;
2284 psf_prev = psf;
2285 }
2286 if (!psf || psf->sf_count[sfmode] == 0) {
2287 /* source filter not found, or count wrong => bug */
2288 return -ESRCH;
2289 }
2290 psf->sf_count[sfmode]--;
2291 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2292 struct inet6_dev *idev = pmc->idev;
2293
2294 /* no more filters for this source */
2295 if (psf_prev)
2296 rcu_assign_pointer(psf_prev->sf_next,
2297 mc_dereference(psf->sf_next, idev));
2298 else
2299 rcu_assign_pointer(pmc->mca_sources,
2300 mc_dereference(psf->sf_next, idev));
2301
2302 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2303 !mld_in_v1_mode(idev)) {
2304 psf->sf_crcount = idev->mc_qrv;
2305 rcu_assign_pointer(psf->sf_next,
2306 mc_dereference(pmc->mca_tomb, idev));
2307 rcu_assign_pointer(pmc->mca_tomb, psf);
2308 rv = 1;
2309 } else {
2310 kfree_rcu(psf, rcu);
2311 }
2312 }
2313 return rv;
2314}
2315
2316/* called with mc_lock */
2317static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2318 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2319 int delta)
2320{
2321 struct ifmcaddr6 *pmc;
2322 int changerec = 0;
2323 int i, err;
2324
2325 if (!idev)
2326 return -ENODEV;
2327
2328 for_each_mc_mclock(idev, pmc) {
2329 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2330 break;
2331 }
2332 if (!pmc)
2333 return -ESRCH;
2334
2335 sf_markstate(pmc);
2336 if (!delta) {
2337 if (!pmc->mca_sfcount[sfmode])
2338 return -EINVAL;
2339
2340 pmc->mca_sfcount[sfmode]--;
2341 }
2342 err = 0;
2343 for (i = 0; i < sfcount; i++) {
2344 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2345
2346 changerec |= rv > 0;
2347 if (!err && rv < 0)
2348 err = rv;
2349 }
2350 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2351 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2352 pmc->mca_sfcount[MCAST_INCLUDE]) {
2353 struct ip6_sf_list *psf;
2354
2355 /* filter mode change */
2356 pmc->mca_sfmode = MCAST_INCLUDE;
2357 pmc->mca_crcount = idev->mc_qrv;
2358 idev->mc_ifc_count = pmc->mca_crcount;
2359 for_each_psf_mclock(pmc, psf)
2360 psf->sf_crcount = 0;
2361 mld_ifc_event(pmc->idev);
2362 } else if (sf_setstate(pmc) || changerec) {
2363 mld_ifc_event(pmc->idev);
2364 }
2365
2366 return err;
2367}
2368
2369/*
2370 * Add multicast single-source filter to the interface list
2371 * called with mc_lock
2372 */
2373static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2374 const struct in6_addr *psfsrc)
2375{
2376 struct ip6_sf_list *psf, *psf_prev;
2377
2378 psf_prev = NULL;
2379 for_each_psf_mclock(pmc, psf) {
2380 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2381 break;
2382 psf_prev = psf;
2383 }
2384 if (!psf) {
2385 psf = kzalloc(sizeof(*psf), GFP_KERNEL);
2386 if (!psf)
2387 return -ENOBUFS;
2388
2389 psf->sf_addr = *psfsrc;
2390 if (psf_prev) {
2391 rcu_assign_pointer(psf_prev->sf_next, psf);
2392 } else {
2393 rcu_assign_pointer(pmc->mca_sources, psf);
2394 }
2395 }
2396 psf->sf_count[sfmode]++;
2397 return 0;
2398}
2399
2400/* called with mc_lock */
2401static void sf_markstate(struct ifmcaddr6 *pmc)
2402{
2403 struct ip6_sf_list *psf;
2404 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2405
2406 for_each_psf_mclock(pmc, psf) {
2407 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2408 psf->sf_oldin = mca_xcount ==
2409 psf->sf_count[MCAST_EXCLUDE] &&
2410 !psf->sf_count[MCAST_INCLUDE];
2411 } else {
2412 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2413 }
2414 }
2415}
2416
2417/* called with mc_lock */
2418static int sf_setstate(struct ifmcaddr6 *pmc)
2419{
2420 struct ip6_sf_list *psf, *dpsf;
2421 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2422 int qrv = pmc->idev->mc_qrv;
2423 int new_in, rv;
2424
2425 rv = 0;
2426 for_each_psf_mclock(pmc, psf) {
2427 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2428 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2429 !psf->sf_count[MCAST_INCLUDE];
2430 } else
2431 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2432 if (new_in) {
2433 if (!psf->sf_oldin) {
2434 struct ip6_sf_list *prev = NULL;
2435
2436 for_each_psf_tomb(pmc, dpsf) {
2437 if (ipv6_addr_equal(&dpsf->sf_addr,
2438 &psf->sf_addr))
2439 break;
2440 prev = dpsf;
2441 }
2442 if (dpsf) {
2443 if (prev)
2444 rcu_assign_pointer(prev->sf_next,
2445 mc_dereference(dpsf->sf_next,
2446 pmc->idev));
2447 else
2448 rcu_assign_pointer(pmc->mca_tomb,
2449 mc_dereference(dpsf->sf_next,
2450 pmc->idev));
2451 kfree_rcu(dpsf, rcu);
2452 }
2453 psf->sf_crcount = qrv;
2454 rv++;
2455 }
2456 } else if (psf->sf_oldin) {
2457 psf->sf_crcount = 0;
2458 /*
2459 * add or update "delete" records if an active filter
2460 * is now inactive
2461 */
2462
2463 for_each_psf_tomb(pmc, dpsf)
2464 if (ipv6_addr_equal(&dpsf->sf_addr,
2465 &psf->sf_addr))
2466 break;
2467 if (!dpsf) {
2468 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL);
2469 if (!dpsf)
2470 continue;
2471 *dpsf = *psf;
2472 rcu_assign_pointer(dpsf->sf_next,
2473 mc_dereference(pmc->mca_tomb, pmc->idev));
2474 rcu_assign_pointer(pmc->mca_tomb, dpsf);
2475 }
2476 dpsf->sf_crcount = qrv;
2477 rv++;
2478 }
2479 }
2480 return rv;
2481}
2482
2483/*
2484 * Add multicast source filter list to the interface list
2485 * called with mc_lock
2486 */
2487static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2488 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2489 int delta)
2490{
2491 struct ifmcaddr6 *pmc;
2492 int isexclude;
2493 int i, err;
2494
2495 if (!idev)
2496 return -ENODEV;
2497
2498 for_each_mc_mclock(idev, pmc) {
2499 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2500 break;
2501 }
2502 if (!pmc)
2503 return -ESRCH;
2504
2505 sf_markstate(pmc);
2506 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2507 if (!delta)
2508 pmc->mca_sfcount[sfmode]++;
2509 err = 0;
2510 for (i = 0; i < sfcount; i++) {
2511 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2512 if (err)
2513 break;
2514 }
2515 if (err) {
2516 int j;
2517
2518 if (!delta)
2519 pmc->mca_sfcount[sfmode]--;
2520 for (j = 0; j < i; j++)
2521 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2522 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2523 struct ip6_sf_list *psf;
2524
2525 /* filter mode change */
2526 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2527 pmc->mca_sfmode = MCAST_EXCLUDE;
2528 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2529 pmc->mca_sfmode = MCAST_INCLUDE;
2530 /* else no filters; keep old mode for reports */
2531
2532 pmc->mca_crcount = idev->mc_qrv;
2533 idev->mc_ifc_count = pmc->mca_crcount;
2534 for_each_psf_mclock(pmc, psf)
2535 psf->sf_crcount = 0;
2536 mld_ifc_event(idev);
2537 } else if (sf_setstate(pmc)) {
2538 mld_ifc_event(idev);
2539 }
2540 return err;
2541}
2542
2543/* called with mc_lock */
2544static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2545{
2546 struct ip6_sf_list *psf, *nextpsf;
2547
2548 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev);
2549 psf;
2550 psf = nextpsf) {
2551 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2552 kfree_rcu(psf, rcu);
2553 }
2554 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
2555 for (psf = mc_dereference(pmc->mca_sources, pmc->idev);
2556 psf;
2557 psf = nextpsf) {
2558 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2559 kfree_rcu(psf, rcu);
2560 }
2561 RCU_INIT_POINTER(pmc->mca_sources, NULL);
2562 pmc->mca_sfmode = MCAST_EXCLUDE;
2563 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2564 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2565}
2566
2567/* called with mc_lock */
2568static void igmp6_join_group(struct ifmcaddr6 *ma)
2569{
2570 unsigned long delay;
2571
2572 if (ma->mca_flags & MAF_NOREPORT)
2573 return;
2574
2575 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2576
2577 delay = get_random_u32_below(unsolicited_report_interval(ma->idev));
2578
2579 if (cancel_delayed_work(&ma->mca_work)) {
2580 refcount_dec(&ma->mca_refcnt);
2581 delay = ma->mca_work.timer.expires - jiffies;
2582 }
2583
2584 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
2585 refcount_inc(&ma->mca_refcnt);
2586 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2587}
2588
2589static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2590 struct inet6_dev *idev)
2591{
2592 struct ip6_sf_socklist *psl;
2593 int err;
2594
2595 psl = sock_dereference(iml->sflist, sk);
2596
2597 if (idev)
2598 mutex_lock(&idev->mc_lock);
2599
2600 if (!psl) {
2601 /* any-source empty exclude case */
2602 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2603 } else {
2604 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2605 psl->sl_count, psl->sl_addr, 0);
2606 RCU_INIT_POINTER(iml->sflist, NULL);
2607 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2608 &sk->sk_omem_alloc);
2609 kfree_rcu(psl, rcu);
2610 }
2611
2612 if (idev)
2613 mutex_unlock(&idev->mc_lock);
2614
2615 return err;
2616}
2617
2618/* called with mc_lock */
2619static void igmp6_leave_group(struct ifmcaddr6 *ma)
2620{
2621 if (mld_in_v1_mode(ma->idev)) {
2622 if (ma->mca_flags & MAF_LAST_REPORTER) {
2623 igmp6_send(&ma->mca_addr, ma->idev->dev,
2624 ICMPV6_MGM_REDUCTION);
2625 }
2626 } else {
2627 mld_add_delrec(ma->idev, ma);
2628 mld_ifc_event(ma->idev);
2629 }
2630}
2631
2632static void mld_gq_work(struct work_struct *work)
2633{
2634 struct inet6_dev *idev = container_of(to_delayed_work(work),
2635 struct inet6_dev,
2636 mc_gq_work);
2637
2638 mutex_lock(&idev->mc_lock);
2639 mld_send_report(idev, NULL);
2640 idev->mc_gq_running = 0;
2641 mutex_unlock(&idev->mc_lock);
2642
2643 in6_dev_put(idev);
2644}
2645
2646static void mld_ifc_work(struct work_struct *work)
2647{
2648 struct inet6_dev *idev = container_of(to_delayed_work(work),
2649 struct inet6_dev,
2650 mc_ifc_work);
2651
2652 mutex_lock(&idev->mc_lock);
2653 mld_send_cr(idev);
2654
2655 if (idev->mc_ifc_count) {
2656 idev->mc_ifc_count--;
2657 if (idev->mc_ifc_count)
2658 mld_ifc_start_work(idev,
2659 unsolicited_report_interval(idev));
2660 }
2661 mutex_unlock(&idev->mc_lock);
2662 in6_dev_put(idev);
2663}
2664
2665/* called with mc_lock */
2666static void mld_ifc_event(struct inet6_dev *idev)
2667{
2668 if (mld_in_v1_mode(idev))
2669 return;
2670
2671 idev->mc_ifc_count = idev->mc_qrv;
2672 mld_ifc_start_work(idev, 1);
2673}
2674
2675static void mld_mca_work(struct work_struct *work)
2676{
2677 struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2678 struct ifmcaddr6, mca_work);
2679
2680 mutex_lock(&ma->idev->mc_lock);
2681 if (mld_in_v1_mode(ma->idev))
2682 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2683 else
2684 mld_send_report(ma->idev, ma);
2685 ma->mca_flags |= MAF_LAST_REPORTER;
2686 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2687 mutex_unlock(&ma->idev->mc_lock);
2688
2689 ma_put(ma);
2690}
2691
2692/* Device changing type */
2693
2694void ipv6_mc_unmap(struct inet6_dev *idev)
2695{
2696 struct ifmcaddr6 *i;
2697
2698 /* Install multicast list, except for all-nodes (already installed) */
2699
2700 mutex_lock(&idev->mc_lock);
2701 for_each_mc_mclock(idev, i)
2702 igmp6_group_dropped(i);
2703 mutex_unlock(&idev->mc_lock);
2704}
2705
2706void ipv6_mc_remap(struct inet6_dev *idev)
2707{
2708 ipv6_mc_up(idev);
2709}
2710
2711/* Device going down */
2712void ipv6_mc_down(struct inet6_dev *idev)
2713{
2714 struct ifmcaddr6 *i;
2715
2716 mutex_lock(&idev->mc_lock);
2717 /* Withdraw multicast list */
2718 for_each_mc_mclock(idev, i)
2719 igmp6_group_dropped(i);
2720 mutex_unlock(&idev->mc_lock);
2721
2722 /* Should stop work after group drop. or we will
2723 * start work again in mld_ifc_event()
2724 */
2725 synchronize_net();
2726 mld_query_stop_work(idev);
2727 mld_report_stop_work(idev);
2728 mld_ifc_stop_work(idev);
2729 mld_gq_stop_work(idev);
2730 mld_dad_stop_work(idev);
2731}
2732
2733static void ipv6_mc_reset(struct inet6_dev *idev)
2734{
2735 idev->mc_qrv = sysctl_mld_qrv;
2736 idev->mc_qi = MLD_QI_DEFAULT;
2737 idev->mc_qri = MLD_QRI_DEFAULT;
2738 idev->mc_v1_seen = 0;
2739 idev->mc_maxdelay = unsolicited_report_interval(idev);
2740}
2741
2742/* Device going up */
2743
2744void ipv6_mc_up(struct inet6_dev *idev)
2745{
2746 struct ifmcaddr6 *i;
2747
2748 /* Install multicast list, except for all-nodes (already installed) */
2749
2750 ipv6_mc_reset(idev);
2751 mutex_lock(&idev->mc_lock);
2752 for_each_mc_mclock(idev, i) {
2753 mld_del_delrec(idev, i);
2754 igmp6_group_added(i);
2755 }
2756 mutex_unlock(&idev->mc_lock);
2757}
2758
2759/* IPv6 device initialization. */
2760
2761void ipv6_mc_init_dev(struct inet6_dev *idev)
2762{
2763 idev->mc_gq_running = 0;
2764 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work);
2765 RCU_INIT_POINTER(idev->mc_tomb, NULL);
2766 idev->mc_ifc_count = 0;
2767 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work);
2768 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work);
2769 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work);
2770 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work);
2771 skb_queue_head_init(&idev->mc_query_queue);
2772 skb_queue_head_init(&idev->mc_report_queue);
2773 spin_lock_init(&idev->mc_query_lock);
2774 spin_lock_init(&idev->mc_report_lock);
2775 mutex_init(&idev->mc_lock);
2776 ipv6_mc_reset(idev);
2777}
2778
2779/*
2780 * Device is about to be destroyed: clean up.
2781 */
2782
2783void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2784{
2785 struct ifmcaddr6 *i;
2786
2787 /* Deactivate works */
2788 ipv6_mc_down(idev);
2789 mutex_lock(&idev->mc_lock);
2790 mld_clear_delrec(idev);
2791 mutex_unlock(&idev->mc_lock);
2792 mld_clear_query(idev);
2793 mld_clear_report(idev);
2794
2795 /* Delete all-nodes address. */
2796 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2797 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2798 * fail.
2799 */
2800 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2801
2802 if (idev->cnf.forwarding)
2803 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2804
2805 mutex_lock(&idev->mc_lock);
2806 while ((i = mc_dereference(idev->mc_list, idev))) {
2807 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev));
2808
2809 ip6_mc_clear_src(i);
2810 ma_put(i);
2811 }
2812 mutex_unlock(&idev->mc_lock);
2813}
2814
2815static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2816{
2817 struct ifmcaddr6 *pmc;
2818
2819 ASSERT_RTNL();
2820
2821 mutex_lock(&idev->mc_lock);
2822 if (mld_in_v1_mode(idev)) {
2823 for_each_mc_mclock(idev, pmc)
2824 igmp6_join_group(pmc);
2825 } else {
2826 mld_send_report(idev, NULL);
2827 }
2828 mutex_unlock(&idev->mc_lock);
2829}
2830
2831static int ipv6_mc_netdev_event(struct notifier_block *this,
2832 unsigned long event,
2833 void *ptr)
2834{
2835 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2836 struct inet6_dev *idev = __in6_dev_get(dev);
2837
2838 switch (event) {
2839 case NETDEV_RESEND_IGMP:
2840 if (idev)
2841 ipv6_mc_rejoin_groups(idev);
2842 break;
2843 default:
2844 break;
2845 }
2846
2847 return NOTIFY_DONE;
2848}
2849
2850static struct notifier_block igmp6_netdev_notifier = {
2851 .notifier_call = ipv6_mc_netdev_event,
2852};
2853
2854#ifdef CONFIG_PROC_FS
2855struct igmp6_mc_iter_state {
2856 struct seq_net_private p;
2857 struct net_device *dev;
2858 struct inet6_dev *idev;
2859};
2860
2861#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2862
2863static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2864{
2865 struct ifmcaddr6 *im = NULL;
2866 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2867 struct net *net = seq_file_net(seq);
2868
2869 state->idev = NULL;
2870 for_each_netdev_rcu(net, state->dev) {
2871 struct inet6_dev *idev;
2872 idev = __in6_dev_get(state->dev);
2873 if (!idev)
2874 continue;
2875
2876 im = rcu_dereference(idev->mc_list);
2877 if (im) {
2878 state->idev = idev;
2879 break;
2880 }
2881 }
2882 return im;
2883}
2884
2885static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2886{
2887 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2888
2889 im = rcu_dereference(im->next);
2890 while (!im) {
2891 state->dev = next_net_device_rcu(state->dev);
2892 if (!state->dev) {
2893 state->idev = NULL;
2894 break;
2895 }
2896 state->idev = __in6_dev_get(state->dev);
2897 if (!state->idev)
2898 continue;
2899 im = rcu_dereference(state->idev->mc_list);
2900 }
2901 return im;
2902}
2903
2904static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2905{
2906 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2907 if (im)
2908 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2909 --pos;
2910 return pos ? NULL : im;
2911}
2912
2913static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2914 __acquires(RCU)
2915{
2916 rcu_read_lock();
2917 return igmp6_mc_get_idx(seq, *pos);
2918}
2919
2920static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2921{
2922 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2923
2924 ++*pos;
2925 return im;
2926}
2927
2928static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2929 __releases(RCU)
2930{
2931 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2932
2933 if (likely(state->idev))
2934 state->idev = NULL;
2935 state->dev = NULL;
2936 rcu_read_unlock();
2937}
2938
2939static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2940{
2941 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2942 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2943
2944 seq_printf(seq,
2945 "%-4d %-15s %pi6 %5d %08X %ld\n",
2946 state->dev->ifindex, state->dev->name,
2947 &im->mca_addr,
2948 im->mca_users, im->mca_flags,
2949 (im->mca_flags & MAF_TIMER_RUNNING) ?
2950 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0);
2951 return 0;
2952}
2953
2954static const struct seq_operations igmp6_mc_seq_ops = {
2955 .start = igmp6_mc_seq_start,
2956 .next = igmp6_mc_seq_next,
2957 .stop = igmp6_mc_seq_stop,
2958 .show = igmp6_mc_seq_show,
2959};
2960
2961struct igmp6_mcf_iter_state {
2962 struct seq_net_private p;
2963 struct net_device *dev;
2964 struct inet6_dev *idev;
2965 struct ifmcaddr6 *im;
2966};
2967
2968#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2969
2970static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2971{
2972 struct ip6_sf_list *psf = NULL;
2973 struct ifmcaddr6 *im = NULL;
2974 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2975 struct net *net = seq_file_net(seq);
2976
2977 state->idev = NULL;
2978 state->im = NULL;
2979 for_each_netdev_rcu(net, state->dev) {
2980 struct inet6_dev *idev;
2981 idev = __in6_dev_get(state->dev);
2982 if (unlikely(idev == NULL))
2983 continue;
2984
2985 im = rcu_dereference(idev->mc_list);
2986 if (likely(im)) {
2987 psf = rcu_dereference(im->mca_sources);
2988 if (likely(psf)) {
2989 state->im = im;
2990 state->idev = idev;
2991 break;
2992 }
2993 }
2994 }
2995 return psf;
2996}
2997
2998static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2999{
3000 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3001
3002 psf = rcu_dereference(psf->sf_next);
3003 while (!psf) {
3004 state->im = rcu_dereference(state->im->next);
3005 while (!state->im) {
3006 state->dev = next_net_device_rcu(state->dev);
3007 if (!state->dev) {
3008 state->idev = NULL;
3009 goto out;
3010 }
3011 state->idev = __in6_dev_get(state->dev);
3012 if (!state->idev)
3013 continue;
3014 state->im = rcu_dereference(state->idev->mc_list);
3015 }
3016 if (!state->im)
3017 break;
3018 psf = rcu_dereference(state->im->mca_sources);
3019 }
3020out:
3021 return psf;
3022}
3023
3024static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3025{
3026 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3027 if (psf)
3028 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3029 --pos;
3030 return pos ? NULL : psf;
3031}
3032
3033static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3034 __acquires(RCU)
3035{
3036 rcu_read_lock();
3037 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3038}
3039
3040static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3041{
3042 struct ip6_sf_list *psf;
3043 if (v == SEQ_START_TOKEN)
3044 psf = igmp6_mcf_get_first(seq);
3045 else
3046 psf = igmp6_mcf_get_next(seq, v);
3047 ++*pos;
3048 return psf;
3049}
3050
3051static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
3052 __releases(RCU)
3053{
3054 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3055
3056 if (likely(state->im))
3057 state->im = NULL;
3058 if (likely(state->idev))
3059 state->idev = NULL;
3060
3061 state->dev = NULL;
3062 rcu_read_unlock();
3063}
3064
3065static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3066{
3067 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3068 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3069
3070 if (v == SEQ_START_TOKEN) {
3071 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
3072 } else {
3073 seq_printf(seq,
3074 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
3075 state->dev->ifindex, state->dev->name,
3076 &state->im->mca_addr,
3077 &psf->sf_addr,
3078 psf->sf_count[MCAST_INCLUDE],
3079 psf->sf_count[MCAST_EXCLUDE]);
3080 }
3081 return 0;
3082}
3083
3084static const struct seq_operations igmp6_mcf_seq_ops = {
3085 .start = igmp6_mcf_seq_start,
3086 .next = igmp6_mcf_seq_next,
3087 .stop = igmp6_mcf_seq_stop,
3088 .show = igmp6_mcf_seq_show,
3089};
3090
3091static int __net_init igmp6_proc_init(struct net *net)
3092{
3093 int err;
3094
3095 err = -ENOMEM;
3096 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3097 sizeof(struct igmp6_mc_iter_state)))
3098 goto out;
3099 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3100 &igmp6_mcf_seq_ops,
3101 sizeof(struct igmp6_mcf_iter_state)))
3102 goto out_proc_net_igmp6;
3103
3104 err = 0;
3105out:
3106 return err;
3107
3108out_proc_net_igmp6:
3109 remove_proc_entry("igmp6", net->proc_net);
3110 goto out;
3111}
3112
3113static void __net_exit igmp6_proc_exit(struct net *net)
3114{
3115 remove_proc_entry("mcfilter6", net->proc_net);
3116 remove_proc_entry("igmp6", net->proc_net);
3117}
3118#else
3119static inline int igmp6_proc_init(struct net *net)
3120{
3121 return 0;
3122}
3123static inline void igmp6_proc_exit(struct net *net)
3124{
3125}
3126#endif
3127
3128static int __net_init igmp6_net_init(struct net *net)
3129{
3130 int err;
3131
3132 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3133 SOCK_RAW, IPPROTO_ICMPV6, net);
3134 if (err < 0) {
3135 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
3136 err);
3137 goto out;
3138 }
3139
3140 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
3141 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
3142
3143 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3144 SOCK_RAW, IPPROTO_ICMPV6, net);
3145 if (err < 0) {
3146 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3147 err);
3148 goto out_sock_create;
3149 }
3150
3151 err = igmp6_proc_init(net);
3152 if (err)
3153 goto out_sock_create_autojoin;
3154
3155 return 0;
3156
3157out_sock_create_autojoin:
3158 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3159out_sock_create:
3160 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3161out:
3162 return err;
3163}
3164
3165static void __net_exit igmp6_net_exit(struct net *net)
3166{
3167 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3168 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3169 igmp6_proc_exit(net);
3170}
3171
3172static struct pernet_operations igmp6_net_ops = {
3173 .init = igmp6_net_init,
3174 .exit = igmp6_net_exit,
3175};
3176
3177int __init igmp6_init(void)
3178{
3179 int err;
3180
3181 err = register_pernet_subsys(&igmp6_net_ops);
3182 if (err)
3183 return err;
3184
3185 mld_wq = create_workqueue("mld");
3186 if (!mld_wq) {
3187 unregister_pernet_subsys(&igmp6_net_ops);
3188 return -ENOMEM;
3189 }
3190
3191 return err;
3192}
3193
3194int __init igmp6_late_init(void)
3195{
3196 return register_netdevice_notifier(&igmp6_netdev_notifier);
3197}
3198
3199void igmp6_cleanup(void)
3200{
3201 unregister_pernet_subsys(&igmp6_net_ops);
3202 destroy_workqueue(mld_wq);
3203}
3204
3205void igmp6_late_cleanup(void)
3206{
3207 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3208}