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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 = READ_ONCE(idev->cnf.mldv1_unsolicited_report_interval);
163 else
164 iv = READ_ONCE(idev->cnf.mldv2_unsolicited_report_interval);
165
166 return iv > 0 ? iv : 1;
167}
168
169static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
170 const struct in6_addr *addr, unsigned int mode)
171{
172 struct net_device *dev = NULL;
173 struct ipv6_mc_socklist *mc_lst;
174 struct ipv6_pinfo *np = inet6_sk(sk);
175 struct net *net = sock_net(sk);
176 int err;
177
178 ASSERT_RTNL();
179
180 if (!ipv6_addr_is_multicast(addr))
181 return -EINVAL;
182
183 for_each_pmc_socklock(np, sk, mc_lst) {
184 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
185 ipv6_addr_equal(&mc_lst->addr, addr))
186 return -EADDRINUSE;
187 }
188
189 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
190
191 if (!mc_lst)
192 return -ENOMEM;
193
194 mc_lst->next = NULL;
195 mc_lst->addr = *addr;
196
197 if (ifindex == 0) {
198 struct rt6_info *rt;
199 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
200 if (rt) {
201 dev = rt->dst.dev;
202 ip6_rt_put(rt);
203 }
204 } else
205 dev = __dev_get_by_index(net, ifindex);
206
207 if (!dev) {
208 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
209 return -ENODEV;
210 }
211
212 mc_lst->ifindex = dev->ifindex;
213 mc_lst->sfmode = mode;
214 RCU_INIT_POINTER(mc_lst->sflist, NULL);
215
216 /*
217 * now add/increase the group membership on the device
218 */
219
220 err = __ipv6_dev_mc_inc(dev, addr, mode);
221
222 if (err) {
223 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
224 return err;
225 }
226
227 mc_lst->next = np->ipv6_mc_list;
228 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
229
230 return 0;
231}
232
233int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
234{
235 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
236}
237EXPORT_SYMBOL(ipv6_sock_mc_join);
238
239int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
240 const struct in6_addr *addr, unsigned int mode)
241{
242 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
243}
244
245/*
246 * socket leave on multicast group
247 */
248int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
249{
250 struct ipv6_pinfo *np = inet6_sk(sk);
251 struct ipv6_mc_socklist *mc_lst;
252 struct ipv6_mc_socklist __rcu **lnk;
253 struct net *net = sock_net(sk);
254
255 ASSERT_RTNL();
256
257 if (!ipv6_addr_is_multicast(addr))
258 return -EINVAL;
259
260 for (lnk = &np->ipv6_mc_list;
261 (mc_lst = sock_dereference(*lnk, sk)) != NULL;
262 lnk = &mc_lst->next) {
263 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
264 ipv6_addr_equal(&mc_lst->addr, addr)) {
265 struct net_device *dev;
266
267 *lnk = mc_lst->next;
268
269 dev = __dev_get_by_index(net, mc_lst->ifindex);
270 if (dev) {
271 struct inet6_dev *idev = __in6_dev_get(dev);
272
273 ip6_mc_leave_src(sk, mc_lst, idev);
274 if (idev)
275 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
276 } else {
277 ip6_mc_leave_src(sk, mc_lst, NULL);
278 }
279
280 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
281 kfree_rcu(mc_lst, rcu);
282 return 0;
283 }
284 }
285
286 return -EADDRNOTAVAIL;
287}
288EXPORT_SYMBOL(ipv6_sock_mc_drop);
289
290static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net,
291 const struct in6_addr *group,
292 int ifindex)
293{
294 struct net_device *dev = NULL;
295 struct inet6_dev *idev = NULL;
296
297 if (ifindex == 0) {
298 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
299
300 if (rt) {
301 dev = rt->dst.dev;
302 ip6_rt_put(rt);
303 }
304 } else {
305 dev = __dev_get_by_index(net, ifindex);
306 }
307
308 if (!dev)
309 return NULL;
310 idev = __in6_dev_get(dev);
311 if (!idev)
312 return NULL;
313 if (idev->dead)
314 return NULL;
315 return idev;
316}
317
318void __ipv6_sock_mc_close(struct sock *sk)
319{
320 struct ipv6_pinfo *np = inet6_sk(sk);
321 struct ipv6_mc_socklist *mc_lst;
322 struct net *net = sock_net(sk);
323
324 ASSERT_RTNL();
325
326 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) {
327 struct net_device *dev;
328
329 np->ipv6_mc_list = mc_lst->next;
330
331 dev = __dev_get_by_index(net, mc_lst->ifindex);
332 if (dev) {
333 struct inet6_dev *idev = __in6_dev_get(dev);
334
335 ip6_mc_leave_src(sk, mc_lst, idev);
336 if (idev)
337 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
338 } else {
339 ip6_mc_leave_src(sk, mc_lst, NULL);
340 }
341
342 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
343 kfree_rcu(mc_lst, rcu);
344 }
345}
346
347void ipv6_sock_mc_close(struct sock *sk)
348{
349 struct ipv6_pinfo *np = inet6_sk(sk);
350
351 if (!rcu_access_pointer(np->ipv6_mc_list))
352 return;
353
354 rtnl_lock();
355 lock_sock(sk);
356 __ipv6_sock_mc_close(sk);
357 release_sock(sk);
358 rtnl_unlock();
359}
360
361int ip6_mc_source(int add, int omode, struct sock *sk,
362 struct group_source_req *pgsr)
363{
364 struct in6_addr *source, *group;
365 struct ipv6_mc_socklist *pmc;
366 struct inet6_dev *idev;
367 struct ipv6_pinfo *inet6 = inet6_sk(sk);
368 struct ip6_sf_socklist *psl;
369 struct net *net = sock_net(sk);
370 int i, j, rv;
371 int leavegroup = 0;
372 int err;
373
374 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
375 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
376
377 if (!ipv6_addr_is_multicast(group))
378 return -EINVAL;
379
380 idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface);
381 if (!idev)
382 return -ENODEV;
383
384 err = -EADDRNOTAVAIL;
385
386 mutex_lock(&idev->mc_lock);
387 for_each_pmc_socklock(inet6, sk, pmc) {
388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
389 continue;
390 if (ipv6_addr_equal(&pmc->addr, group))
391 break;
392 }
393 if (!pmc) { /* must have a prior join */
394 err = -EINVAL;
395 goto done;
396 }
397 /* if a source filter was set, must be the same mode as before */
398 if (rcu_access_pointer(pmc->sflist)) {
399 if (pmc->sfmode != omode) {
400 err = -EINVAL;
401 goto done;
402 }
403 } else if (pmc->sfmode != omode) {
404 /* allow mode switches for empty-set filters */
405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
407 pmc->sfmode = omode;
408 }
409
410 psl = sock_dereference(pmc->sflist, sk);
411 if (!add) {
412 if (!psl)
413 goto done; /* err = -EADDRNOTAVAIL */
414 rv = !0;
415 for (i = 0; i < psl->sl_count; i++) {
416 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
417 if (rv == 0)
418 break;
419 }
420 if (rv) /* source not found */
421 goto done; /* err = -EADDRNOTAVAIL */
422
423 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
424 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
425 leavegroup = 1;
426 goto done;
427 }
428
429 /* update the interface filter */
430 ip6_mc_del_src(idev, group, omode, 1, source, 1);
431
432 for (j = i+1; j < psl->sl_count; j++)
433 psl->sl_addr[j-1] = psl->sl_addr[j];
434 psl->sl_count--;
435 err = 0;
436 goto done;
437 }
438 /* else, add a new source to the filter */
439
440 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
441 err = -ENOBUFS;
442 goto done;
443 }
444 if (!psl || psl->sl_count == psl->sl_max) {
445 struct ip6_sf_socklist *newpsl;
446 int count = IP6_SFBLOCK;
447
448 if (psl)
449 count += psl->sl_max;
450 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count),
451 GFP_KERNEL);
452 if (!newpsl) {
453 err = -ENOBUFS;
454 goto done;
455 }
456 newpsl->sl_max = count;
457 newpsl->sl_count = count - IP6_SFBLOCK;
458 if (psl) {
459 for (i = 0; i < psl->sl_count; i++)
460 newpsl->sl_addr[i] = psl->sl_addr[i];
461 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
462 &sk->sk_omem_alloc);
463 }
464 rcu_assign_pointer(pmc->sflist, newpsl);
465 kfree_rcu(psl, rcu);
466 psl = newpsl;
467 }
468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
469 for (i = 0; i < psl->sl_count; i++) {
470 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
471 if (rv == 0) /* There is an error in the address. */
472 goto done;
473 }
474 for (j = psl->sl_count-1; j >= i; j--)
475 psl->sl_addr[j+1] = psl->sl_addr[j];
476 psl->sl_addr[i] = *source;
477 psl->sl_count++;
478 err = 0;
479 /* update the interface list */
480 ip6_mc_add_src(idev, group, omode, 1, source, 1);
481done:
482 mutex_unlock(&idev->mc_lock);
483 if (leavegroup)
484 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
485 return err;
486}
487
488int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
489 struct sockaddr_storage *list)
490{
491 const struct in6_addr *group;
492 struct ipv6_mc_socklist *pmc;
493 struct inet6_dev *idev;
494 struct ipv6_pinfo *inet6 = inet6_sk(sk);
495 struct ip6_sf_socklist *newpsl, *psl;
496 struct net *net = sock_net(sk);
497 int leavegroup = 0;
498 int i, err;
499
500 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
501
502 if (!ipv6_addr_is_multicast(group))
503 return -EINVAL;
504 if (gsf->gf_fmode != MCAST_INCLUDE &&
505 gsf->gf_fmode != MCAST_EXCLUDE)
506 return -EINVAL;
507
508 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface);
509 if (!idev)
510 return -ENODEV;
511
512 err = 0;
513
514 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
515 leavegroup = 1;
516 goto done;
517 }
518
519 for_each_pmc_socklock(inet6, sk, pmc) {
520 if (pmc->ifindex != gsf->gf_interface)
521 continue;
522 if (ipv6_addr_equal(&pmc->addr, group))
523 break;
524 }
525 if (!pmc) { /* must have a prior join */
526 err = -EINVAL;
527 goto done;
528 }
529 if (gsf->gf_numsrc) {
530 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr,
531 gsf->gf_numsrc),
532 GFP_KERNEL);
533 if (!newpsl) {
534 err = -ENOBUFS;
535 goto done;
536 }
537 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
538 for (i = 0; i < newpsl->sl_count; ++i, ++list) {
539 struct sockaddr_in6 *psin6;
540
541 psin6 = (struct sockaddr_in6 *)list;
542 newpsl->sl_addr[i] = psin6->sin6_addr;
543 }
544 mutex_lock(&idev->mc_lock);
545 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
546 newpsl->sl_count, newpsl->sl_addr, 0);
547 if (err) {
548 mutex_unlock(&idev->mc_lock);
549 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr,
550 newpsl->sl_max));
551 goto done;
552 }
553 mutex_unlock(&idev->mc_lock);
554 } else {
555 newpsl = NULL;
556 mutex_lock(&idev->mc_lock);
557 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
558 mutex_unlock(&idev->mc_lock);
559 }
560
561 mutex_lock(&idev->mc_lock);
562 psl = sock_dereference(pmc->sflist, sk);
563 if (psl) {
564 ip6_mc_del_src(idev, group, pmc->sfmode,
565 psl->sl_count, psl->sl_addr, 0);
566 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
567 &sk->sk_omem_alloc);
568 } else {
569 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
570 }
571 rcu_assign_pointer(pmc->sflist, newpsl);
572 mutex_unlock(&idev->mc_lock);
573 kfree_rcu(psl, rcu);
574 pmc->sfmode = gsf->gf_fmode;
575 err = 0;
576done:
577 if (leavegroup)
578 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
579 return err;
580}
581
582int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
583 sockptr_t optval, size_t ss_offset)
584{
585 struct ipv6_pinfo *inet6 = inet6_sk(sk);
586 const struct in6_addr *group;
587 struct ipv6_mc_socklist *pmc;
588 struct ip6_sf_socklist *psl;
589 int i, count, copycount;
590
591 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
592
593 if (!ipv6_addr_is_multicast(group))
594 return -EINVAL;
595
596 /* changes to the ipv6_mc_list require the socket lock and
597 * rtnl lock. We have the socket lock, so reading the list is safe.
598 */
599
600 for_each_pmc_socklock(inet6, sk, pmc) {
601 if (pmc->ifindex != gsf->gf_interface)
602 continue;
603 if (ipv6_addr_equal(group, &pmc->addr))
604 break;
605 }
606 if (!pmc) /* must have a prior join */
607 return -EADDRNOTAVAIL;
608
609 gsf->gf_fmode = pmc->sfmode;
610 psl = sock_dereference(pmc->sflist, sk);
611 count = psl ? psl->sl_count : 0;
612
613 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
614 gsf->gf_numsrc = count;
615 for (i = 0; i < copycount; i++) {
616 struct sockaddr_in6 *psin6;
617 struct sockaddr_storage ss;
618
619 psin6 = (struct sockaddr_in6 *)&ss;
620 memset(&ss, 0, sizeof(ss));
621 psin6->sin6_family = AF_INET6;
622 psin6->sin6_addr = psl->sl_addr[i];
623 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss)))
624 return -EFAULT;
625 ss_offset += sizeof(ss);
626 }
627 return 0;
628}
629
630bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr,
631 const struct in6_addr *src_addr)
632{
633 const struct ipv6_pinfo *np = inet6_sk(sk);
634 const struct ipv6_mc_socklist *mc;
635 const struct ip6_sf_socklist *psl;
636 bool rv = true;
637
638 rcu_read_lock();
639 for_each_pmc_rcu(np, mc) {
640 if (ipv6_addr_equal(&mc->addr, mc_addr))
641 break;
642 }
643 if (!mc) {
644 rcu_read_unlock();
645 return inet6_test_bit(MC6_ALL, sk);
646 }
647 psl = rcu_dereference(mc->sflist);
648 if (!psl) {
649 rv = mc->sfmode == MCAST_EXCLUDE;
650 } else {
651 int i;
652
653 for (i = 0; i < psl->sl_count; i++) {
654 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
655 break;
656 }
657 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
658 rv = false;
659 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
660 rv = false;
661 }
662 rcu_read_unlock();
663
664 return rv;
665}
666
667/* called with mc_lock */
668static void igmp6_group_added(struct ifmcaddr6 *mc)
669{
670 struct net_device *dev = mc->idev->dev;
671 char buf[MAX_ADDR_LEN];
672
673 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
674 IPV6_ADDR_SCOPE_LINKLOCAL)
675 return;
676
677 if (!(mc->mca_flags&MAF_LOADED)) {
678 mc->mca_flags |= MAF_LOADED;
679 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
680 dev_mc_add(dev, buf);
681 }
682
683 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
684 return;
685
686 if (mld_in_v1_mode(mc->idev)) {
687 igmp6_join_group(mc);
688 return;
689 }
690 /* else v2 */
691
692 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
693 * should not send filter-mode change record as the mode
694 * should be from IN() to IN(A).
695 */
696 if (mc->mca_sfmode == MCAST_EXCLUDE)
697 mc->mca_crcount = mc->idev->mc_qrv;
698
699 mld_ifc_event(mc->idev);
700}
701
702/* called with mc_lock */
703static void igmp6_group_dropped(struct ifmcaddr6 *mc)
704{
705 struct net_device *dev = mc->idev->dev;
706 char buf[MAX_ADDR_LEN];
707
708 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
709 IPV6_ADDR_SCOPE_LINKLOCAL)
710 return;
711
712 if (mc->mca_flags&MAF_LOADED) {
713 mc->mca_flags &= ~MAF_LOADED;
714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
715 dev_mc_del(dev, buf);
716 }
717
718 if (mc->mca_flags & MAF_NOREPORT)
719 return;
720
721 if (!mc->idev->dead)
722 igmp6_leave_group(mc);
723
724 if (cancel_delayed_work(&mc->mca_work))
725 refcount_dec(&mc->mca_refcnt);
726}
727
728/*
729 * deleted ifmcaddr6 manipulation
730 * called with mc_lock
731 */
732static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
733{
734 struct ifmcaddr6 *pmc;
735
736 /* this is an "ifmcaddr6" for convenience; only the fields below
737 * are actually used. In particular, the refcnt and users are not
738 * used for management of the delete list. Using the same structure
739 * for deleted items allows change reports to use common code with
740 * non-deleted or query-response MCA's.
741 */
742 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
743 if (!pmc)
744 return;
745
746 pmc->idev = im->idev;
747 in6_dev_hold(idev);
748 pmc->mca_addr = im->mca_addr;
749 pmc->mca_crcount = idev->mc_qrv;
750 pmc->mca_sfmode = im->mca_sfmode;
751 if (pmc->mca_sfmode == MCAST_INCLUDE) {
752 struct ip6_sf_list *psf;
753
754 rcu_assign_pointer(pmc->mca_tomb,
755 mc_dereference(im->mca_tomb, idev));
756 rcu_assign_pointer(pmc->mca_sources,
757 mc_dereference(im->mca_sources, idev));
758 RCU_INIT_POINTER(im->mca_tomb, NULL);
759 RCU_INIT_POINTER(im->mca_sources, NULL);
760
761 for_each_psf_mclock(pmc, psf)
762 psf->sf_crcount = pmc->mca_crcount;
763 }
764
765 rcu_assign_pointer(pmc->next, idev->mc_tomb);
766 rcu_assign_pointer(idev->mc_tomb, pmc);
767}
768
769/* called with mc_lock */
770static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
771{
772 struct ip6_sf_list *psf, *sources, *tomb;
773 struct in6_addr *pmca = &im->mca_addr;
774 struct ifmcaddr6 *pmc, *pmc_prev;
775
776 pmc_prev = NULL;
777 for_each_mc_tomb(idev, pmc) {
778 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
779 break;
780 pmc_prev = pmc;
781 }
782 if (pmc) {
783 if (pmc_prev)
784 rcu_assign_pointer(pmc_prev->next, pmc->next);
785 else
786 rcu_assign_pointer(idev->mc_tomb, pmc->next);
787 }
788
789 if (pmc) {
790 im->idev = pmc->idev;
791 if (im->mca_sfmode == MCAST_INCLUDE) {
792 tomb = rcu_replace_pointer(im->mca_tomb,
793 mc_dereference(pmc->mca_tomb, pmc->idev),
794 lockdep_is_held(&im->idev->mc_lock));
795 rcu_assign_pointer(pmc->mca_tomb, tomb);
796
797 sources = rcu_replace_pointer(im->mca_sources,
798 mc_dereference(pmc->mca_sources, pmc->idev),
799 lockdep_is_held(&im->idev->mc_lock));
800 rcu_assign_pointer(pmc->mca_sources, sources);
801 for_each_psf_mclock(im, psf)
802 psf->sf_crcount = idev->mc_qrv;
803 } else {
804 im->mca_crcount = idev->mc_qrv;
805 }
806 in6_dev_put(pmc->idev);
807 ip6_mc_clear_src(pmc);
808 kfree_rcu(pmc, rcu);
809 }
810}
811
812/* called with mc_lock */
813static void mld_clear_delrec(struct inet6_dev *idev)
814{
815 struct ifmcaddr6 *pmc, *nextpmc;
816
817 pmc = mc_dereference(idev->mc_tomb, idev);
818 RCU_INIT_POINTER(idev->mc_tomb, NULL);
819
820 for (; pmc; pmc = nextpmc) {
821 nextpmc = mc_dereference(pmc->next, idev);
822 ip6_mc_clear_src(pmc);
823 in6_dev_put(pmc->idev);
824 kfree_rcu(pmc, rcu);
825 }
826
827 /* clear dead sources, too */
828 for_each_mc_mclock(idev, pmc) {
829 struct ip6_sf_list *psf, *psf_next;
830
831 psf = mc_dereference(pmc->mca_tomb, idev);
832 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
833 for (; psf; psf = psf_next) {
834 psf_next = mc_dereference(psf->sf_next, idev);
835 kfree_rcu(psf, rcu);
836 }
837 }
838}
839
840static void mld_clear_query(struct inet6_dev *idev)
841{
842 struct sk_buff *skb;
843
844 spin_lock_bh(&idev->mc_query_lock);
845 while ((skb = __skb_dequeue(&idev->mc_query_queue)))
846 kfree_skb(skb);
847 spin_unlock_bh(&idev->mc_query_lock);
848}
849
850static void mld_clear_report(struct inet6_dev *idev)
851{
852 struct sk_buff *skb;
853
854 spin_lock_bh(&idev->mc_report_lock);
855 while ((skb = __skb_dequeue(&idev->mc_report_queue)))
856 kfree_skb(skb);
857 spin_unlock_bh(&idev->mc_report_lock);
858}
859
860static void mca_get(struct ifmcaddr6 *mc)
861{
862 refcount_inc(&mc->mca_refcnt);
863}
864
865static void ma_put(struct ifmcaddr6 *mc)
866{
867 if (refcount_dec_and_test(&mc->mca_refcnt)) {
868 in6_dev_put(mc->idev);
869 kfree_rcu(mc, rcu);
870 }
871}
872
873/* called with mc_lock */
874static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
875 const struct in6_addr *addr,
876 unsigned int mode)
877{
878 struct ifmcaddr6 *mc;
879
880 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
881 if (!mc)
882 return NULL;
883
884 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work);
885
886 mc->mca_addr = *addr;
887 mc->idev = idev; /* reference taken by caller */
888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 refcount_set(&mc->mca_refcnt, 1);
892
893 mc->mca_sfmode = mode;
894 mc->mca_sfcount[mode] = 1;
895
896 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
897 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
898 mc->mca_flags |= MAF_NOREPORT;
899
900 return mc;
901}
902
903/*
904 * device multicast group inc (add if not found)
905 */
906static int __ipv6_dev_mc_inc(struct net_device *dev,
907 const struct in6_addr *addr, unsigned int mode)
908{
909 struct ifmcaddr6 *mc;
910 struct inet6_dev *idev;
911
912 ASSERT_RTNL();
913
914 /* we need to take a reference on idev */
915 idev = in6_dev_get(dev);
916
917 if (!idev)
918 return -EINVAL;
919
920 if (idev->dead) {
921 in6_dev_put(idev);
922 return -ENODEV;
923 }
924
925 mutex_lock(&idev->mc_lock);
926 for_each_mc_mclock(idev, mc) {
927 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
928 mc->mca_users++;
929 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
930 mutex_unlock(&idev->mc_lock);
931 in6_dev_put(idev);
932 return 0;
933 }
934 }
935
936 mc = mca_alloc(idev, addr, mode);
937 if (!mc) {
938 mutex_unlock(&idev->mc_lock);
939 in6_dev_put(idev);
940 return -ENOMEM;
941 }
942
943 rcu_assign_pointer(mc->next, idev->mc_list);
944 rcu_assign_pointer(idev->mc_list, mc);
945
946 mca_get(mc);
947
948 mld_del_delrec(idev, mc);
949 igmp6_group_added(mc);
950 mutex_unlock(&idev->mc_lock);
951 ma_put(mc);
952 return 0;
953}
954
955int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
956{
957 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
958}
959EXPORT_SYMBOL(ipv6_dev_mc_inc);
960
961/*
962 * device multicast group del
963 */
964int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
965{
966 struct ifmcaddr6 *ma, __rcu **map;
967
968 ASSERT_RTNL();
969
970 mutex_lock(&idev->mc_lock);
971 for (map = &idev->mc_list;
972 (ma = mc_dereference(*map, idev));
973 map = &ma->next) {
974 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
975 if (--ma->mca_users == 0) {
976 *map = ma->next;
977
978 igmp6_group_dropped(ma);
979 ip6_mc_clear_src(ma);
980 mutex_unlock(&idev->mc_lock);
981
982 ma_put(ma);
983 return 0;
984 }
985 mutex_unlock(&idev->mc_lock);
986 return 0;
987 }
988 }
989
990 mutex_unlock(&idev->mc_lock);
991 return -ENOENT;
992}
993
994int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
995{
996 struct inet6_dev *idev;
997 int err;
998
999 ASSERT_RTNL();
1000
1001 idev = __in6_dev_get(dev);
1002 if (!idev)
1003 err = -ENODEV;
1004 else
1005 err = __ipv6_dev_mc_dec(idev, addr);
1006
1007 return err;
1008}
1009EXPORT_SYMBOL(ipv6_dev_mc_dec);
1010
1011/*
1012 * check if the interface/address pair is valid
1013 */
1014bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1015 const struct in6_addr *src_addr)
1016{
1017 struct inet6_dev *idev;
1018 struct ifmcaddr6 *mc;
1019 bool rv = false;
1020
1021 rcu_read_lock();
1022 idev = __in6_dev_get(dev);
1023 if (idev) {
1024 for_each_mc_rcu(idev, mc) {
1025 if (ipv6_addr_equal(&mc->mca_addr, group))
1026 break;
1027 }
1028 if (mc) {
1029 if (src_addr && !ipv6_addr_any(src_addr)) {
1030 struct ip6_sf_list *psf;
1031
1032 for_each_psf_rcu(mc, psf) {
1033 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1034 break;
1035 }
1036 if (psf)
1037 rv = psf->sf_count[MCAST_INCLUDE] ||
1038 psf->sf_count[MCAST_EXCLUDE] !=
1039 mc->mca_sfcount[MCAST_EXCLUDE];
1040 else
1041 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1042 } else
1043 rv = true; /* don't filter unspecified source */
1044 }
1045 }
1046 rcu_read_unlock();
1047 return rv;
1048}
1049
1050/* called with mc_lock */
1051static void mld_gq_start_work(struct inet6_dev *idev)
1052{
1053 unsigned long tv = get_random_u32_below(idev->mc_maxdelay);
1054
1055 idev->mc_gq_running = 1;
1056 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
1057 in6_dev_hold(idev);
1058}
1059
1060/* called with mc_lock */
1061static void mld_gq_stop_work(struct inet6_dev *idev)
1062{
1063 idev->mc_gq_running = 0;
1064 if (cancel_delayed_work(&idev->mc_gq_work))
1065 __in6_dev_put(idev);
1066}
1067
1068/* called with mc_lock */
1069static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
1070{
1071 unsigned long tv = get_random_u32_below(delay);
1072
1073 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
1074 in6_dev_hold(idev);
1075}
1076
1077/* called with mc_lock */
1078static void mld_ifc_stop_work(struct inet6_dev *idev)
1079{
1080 idev->mc_ifc_count = 0;
1081 if (cancel_delayed_work(&idev->mc_ifc_work))
1082 __in6_dev_put(idev);
1083}
1084
1085/* called with mc_lock */
1086static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
1087{
1088 unsigned long tv = get_random_u32_below(delay);
1089
1090 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
1091 in6_dev_hold(idev);
1092}
1093
1094static void mld_dad_stop_work(struct inet6_dev *idev)
1095{
1096 if (cancel_delayed_work(&idev->mc_dad_work))
1097 __in6_dev_put(idev);
1098}
1099
1100static void mld_query_stop_work(struct inet6_dev *idev)
1101{
1102 spin_lock_bh(&idev->mc_query_lock);
1103 if (cancel_delayed_work(&idev->mc_query_work))
1104 __in6_dev_put(idev);
1105 spin_unlock_bh(&idev->mc_query_lock);
1106}
1107
1108static void mld_report_stop_work(struct inet6_dev *idev)
1109{
1110 if (cancel_delayed_work_sync(&idev->mc_report_work))
1111 __in6_dev_put(idev);
1112}
1113
1114/*
1115 * IGMP handling (alias multicast ICMPv6 messages)
1116 * called with mc_lock
1117 */
1118static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1119{
1120 unsigned long delay = resptime;
1121
1122 /* Do not start work for these addresses */
1123 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1124 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1125 return;
1126
1127 if (cancel_delayed_work(&ma->mca_work)) {
1128 refcount_dec(&ma->mca_refcnt);
1129 delay = ma->mca_work.timer.expires - jiffies;
1130 }
1131
1132 if (delay >= resptime)
1133 delay = get_random_u32_below(resptime);
1134
1135 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
1136 refcount_inc(&ma->mca_refcnt);
1137 ma->mca_flags |= MAF_TIMER_RUNNING;
1138}
1139
1140/* mark EXCLUDE-mode sources
1141 * called with mc_lock
1142 */
1143static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1144 const struct in6_addr *srcs)
1145{
1146 struct ip6_sf_list *psf;
1147 int i, scount;
1148
1149 scount = 0;
1150 for_each_psf_mclock(pmc, psf) {
1151 if (scount == nsrcs)
1152 break;
1153 for (i = 0; i < nsrcs; i++) {
1154 /* skip inactive filters */
1155 if (psf->sf_count[MCAST_INCLUDE] ||
1156 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1157 psf->sf_count[MCAST_EXCLUDE])
1158 break;
1159 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1160 scount++;
1161 break;
1162 }
1163 }
1164 }
1165 pmc->mca_flags &= ~MAF_GSQUERY;
1166 if (scount == nsrcs) /* all sources excluded */
1167 return false;
1168 return true;
1169}
1170
1171/* called with mc_lock */
1172static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1173 const struct in6_addr *srcs)
1174{
1175 struct ip6_sf_list *psf;
1176 int i, scount;
1177
1178 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1179 return mld_xmarksources(pmc, nsrcs, srcs);
1180
1181 /* mark INCLUDE-mode sources */
1182
1183 scount = 0;
1184 for_each_psf_mclock(pmc, psf) {
1185 if (scount == nsrcs)
1186 break;
1187 for (i = 0; i < nsrcs; i++) {
1188 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1189 psf->sf_gsresp = 1;
1190 scount++;
1191 break;
1192 }
1193 }
1194 }
1195 if (!scount) {
1196 pmc->mca_flags &= ~MAF_GSQUERY;
1197 return false;
1198 }
1199 pmc->mca_flags |= MAF_GSQUERY;
1200 return true;
1201}
1202
1203static int mld_force_mld_version(const struct inet6_dev *idev)
1204{
1205 const struct net *net = dev_net(idev->dev);
1206 int all_force;
1207
1208 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version);
1209 /* Normally, both are 0 here. If enforcement to a particular is
1210 * being used, individual device enforcement will have a lower
1211 * precedence over 'all' device (.../conf/all/force_mld_version).
1212 */
1213 return all_force ?: READ_ONCE(idev->cnf.force_mld_version);
1214}
1215
1216static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1217{
1218 return mld_force_mld_version(idev) == 2;
1219}
1220
1221static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1222{
1223 return mld_force_mld_version(idev) == 1;
1224}
1225
1226static bool mld_in_v1_mode(const struct inet6_dev *idev)
1227{
1228 if (mld_in_v2_mode_only(idev))
1229 return false;
1230 if (mld_in_v1_mode_only(idev))
1231 return true;
1232 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1233 return true;
1234
1235 return false;
1236}
1237
1238static void mld_set_v1_mode(struct inet6_dev *idev)
1239{
1240 /* RFC3810, relevant sections:
1241 * - 9.1. Robustness Variable
1242 * - 9.2. Query Interval
1243 * - 9.3. Query Response Interval
1244 * - 9.12. Older Version Querier Present Timeout
1245 */
1246 unsigned long switchback;
1247
1248 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1249
1250 idev->mc_v1_seen = jiffies + switchback;
1251}
1252
1253static void mld_update_qrv(struct inet6_dev *idev,
1254 const struct mld2_query *mlh2)
1255{
1256 /* RFC3810, relevant sections:
1257 * - 5.1.8. QRV (Querier's Robustness Variable)
1258 * - 9.1. Robustness Variable
1259 */
1260
1261 /* The value of the Robustness Variable MUST NOT be zero,
1262 * and SHOULD NOT be one. Catch this here if we ever run
1263 * into such a case in future.
1264 */
1265 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1266 WARN_ON(idev->mc_qrv == 0);
1267
1268 if (mlh2->mld2q_qrv > 0)
1269 idev->mc_qrv = mlh2->mld2q_qrv;
1270
1271 if (unlikely(idev->mc_qrv < min_qrv)) {
1272 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1273 idev->mc_qrv, min_qrv);
1274 idev->mc_qrv = min_qrv;
1275 }
1276}
1277
1278static void mld_update_qi(struct inet6_dev *idev,
1279 const struct mld2_query *mlh2)
1280{
1281 /* RFC3810, relevant sections:
1282 * - 5.1.9. QQIC (Querier's Query Interval Code)
1283 * - 9.2. Query Interval
1284 * - 9.12. Older Version Querier Present Timeout
1285 * (the [Query Interval] in the last Query received)
1286 */
1287 unsigned long mc_qqi;
1288
1289 if (mlh2->mld2q_qqic < 128) {
1290 mc_qqi = mlh2->mld2q_qqic;
1291 } else {
1292 unsigned long mc_man, mc_exp;
1293
1294 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1295 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1296
1297 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1298 }
1299
1300 idev->mc_qi = mc_qqi * HZ;
1301}
1302
1303static void mld_update_qri(struct inet6_dev *idev,
1304 const struct mld2_query *mlh2)
1305{
1306 /* RFC3810, relevant sections:
1307 * - 5.1.3. Maximum Response Code
1308 * - 9.3. Query Response Interval
1309 */
1310 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1311}
1312
1313static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1314 unsigned long *max_delay, bool v1_query)
1315{
1316 unsigned long mldv1_md;
1317
1318 /* Ignore v1 queries */
1319 if (mld_in_v2_mode_only(idev))
1320 return -EINVAL;
1321
1322 mldv1_md = ntohs(mld->mld_maxdelay);
1323
1324 /* When in MLDv1 fallback and a MLDv2 router start-up being
1325 * unaware of current MLDv1 operation, the MRC == MRD mapping
1326 * only works when the exponential algorithm is not being
1327 * used (as MLDv1 is unaware of such things).
1328 *
1329 * According to the RFC author, the MLDv2 implementations
1330 * he's aware of all use a MRC < 32768 on start up queries.
1331 *
1332 * Thus, should we *ever* encounter something else larger
1333 * than that, just assume the maximum possible within our
1334 * reach.
1335 */
1336 if (!v1_query)
1337 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1338
1339 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1340
1341 /* MLDv1 router present: we need to go into v1 mode *only*
1342 * when an MLDv1 query is received as per section 9.12. of
1343 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1344 * queries MUST be of exactly 24 octets.
1345 */
1346 if (v1_query)
1347 mld_set_v1_mode(idev);
1348
1349 /* cancel MLDv2 report work */
1350 mld_gq_stop_work(idev);
1351 /* cancel the interface change work */
1352 mld_ifc_stop_work(idev);
1353 /* clear deleted report items */
1354 mld_clear_delrec(idev);
1355
1356 return 0;
1357}
1358
1359static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1360 unsigned long *max_delay)
1361{
1362 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1363
1364 mld_update_qrv(idev, mld);
1365 mld_update_qi(idev, mld);
1366 mld_update_qri(idev, mld);
1367
1368 idev->mc_maxdelay = *max_delay;
1369
1370 return;
1371}
1372
1373/* called with rcu_read_lock() */
1374void igmp6_event_query(struct sk_buff *skb)
1375{
1376 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1377
1378 if (!idev || idev->dead)
1379 goto out;
1380
1381 spin_lock_bh(&idev->mc_query_lock);
1382 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) {
1383 __skb_queue_tail(&idev->mc_query_queue, skb);
1384 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0))
1385 in6_dev_hold(idev);
1386 skb = NULL;
1387 }
1388 spin_unlock_bh(&idev->mc_query_lock);
1389out:
1390 kfree_skb(skb);
1391}
1392
1393static void __mld_query_work(struct sk_buff *skb)
1394{
1395 struct mld2_query *mlh2 = NULL;
1396 const struct in6_addr *group;
1397 unsigned long max_delay;
1398 struct inet6_dev *idev;
1399 struct ifmcaddr6 *ma;
1400 struct mld_msg *mld;
1401 int group_type;
1402 int mark = 0;
1403 int len, err;
1404
1405 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1406 goto kfree_skb;
1407
1408 /* compute payload length excluding extension headers */
1409 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1410 len -= skb_network_header_len(skb);
1411
1412 /* RFC3810 6.2
1413 * Upon reception of an MLD message that contains a Query, the node
1414 * checks if the source address of the message is a valid link-local
1415 * address, if the Hop Limit is set to 1, and if the Router Alert
1416 * option is present in the Hop-By-Hop Options header of the IPv6
1417 * packet. If any of these checks fails, the packet is dropped.
1418 */
1419 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1420 ipv6_hdr(skb)->hop_limit != 1 ||
1421 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1422 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1423 goto kfree_skb;
1424
1425 idev = in6_dev_get(skb->dev);
1426 if (!idev)
1427 goto kfree_skb;
1428
1429 mld = (struct mld_msg *)icmp6_hdr(skb);
1430 group = &mld->mld_mca;
1431 group_type = ipv6_addr_type(group);
1432
1433 if (group_type != IPV6_ADDR_ANY &&
1434 !(group_type&IPV6_ADDR_MULTICAST))
1435 goto out;
1436
1437 if (len < MLD_V1_QUERY_LEN) {
1438 goto out;
1439 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1440 err = mld_process_v1(idev, mld, &max_delay,
1441 len == MLD_V1_QUERY_LEN);
1442 if (err < 0)
1443 goto out;
1444 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1445 int srcs_offset = sizeof(struct mld2_query) -
1446 sizeof(struct icmp6hdr);
1447
1448 if (!pskb_may_pull(skb, srcs_offset))
1449 goto out;
1450
1451 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1452
1453 mld_process_v2(idev, mlh2, &max_delay);
1454
1455 if (group_type == IPV6_ADDR_ANY) { /* general query */
1456 if (mlh2->mld2q_nsrcs)
1457 goto out; /* no sources allowed */
1458
1459 mld_gq_start_work(idev);
1460 goto out;
1461 }
1462 /* mark sources to include, if group & source-specific */
1463 if (mlh2->mld2q_nsrcs != 0) {
1464 if (!pskb_may_pull(skb, srcs_offset +
1465 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1466 goto out;
1467
1468 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1469 mark = 1;
1470 }
1471 } else {
1472 goto out;
1473 }
1474
1475 if (group_type == IPV6_ADDR_ANY) {
1476 for_each_mc_mclock(idev, ma) {
1477 igmp6_group_queried(ma, max_delay);
1478 }
1479 } else {
1480 for_each_mc_mclock(idev, ma) {
1481 if (!ipv6_addr_equal(group, &ma->mca_addr))
1482 continue;
1483 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1484 /* gsquery <- gsquery && mark */
1485 if (!mark)
1486 ma->mca_flags &= ~MAF_GSQUERY;
1487 } else {
1488 /* gsquery <- mark */
1489 if (mark)
1490 ma->mca_flags |= MAF_GSQUERY;
1491 else
1492 ma->mca_flags &= ~MAF_GSQUERY;
1493 }
1494 if (!(ma->mca_flags & MAF_GSQUERY) ||
1495 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1496 igmp6_group_queried(ma, max_delay);
1497 break;
1498 }
1499 }
1500
1501out:
1502 in6_dev_put(idev);
1503kfree_skb:
1504 consume_skb(skb);
1505}
1506
1507static void mld_query_work(struct work_struct *work)
1508{
1509 struct inet6_dev *idev = container_of(to_delayed_work(work),
1510 struct inet6_dev,
1511 mc_query_work);
1512 struct sk_buff_head q;
1513 struct sk_buff *skb;
1514 bool rework = false;
1515 int cnt = 0;
1516
1517 skb_queue_head_init(&q);
1518
1519 spin_lock_bh(&idev->mc_query_lock);
1520 while ((skb = __skb_dequeue(&idev->mc_query_queue))) {
1521 __skb_queue_tail(&q, skb);
1522
1523 if (++cnt >= MLD_MAX_QUEUE) {
1524 rework = true;
1525 break;
1526 }
1527 }
1528 spin_unlock_bh(&idev->mc_query_lock);
1529
1530 mutex_lock(&idev->mc_lock);
1531 while ((skb = __skb_dequeue(&q)))
1532 __mld_query_work(skb);
1533 mutex_unlock(&idev->mc_lock);
1534
1535 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0))
1536 return;
1537
1538 in6_dev_put(idev);
1539}
1540
1541/* called with rcu_read_lock() */
1542void igmp6_event_report(struct sk_buff *skb)
1543{
1544 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1545
1546 if (!idev || idev->dead)
1547 goto out;
1548
1549 spin_lock_bh(&idev->mc_report_lock);
1550 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) {
1551 __skb_queue_tail(&idev->mc_report_queue, skb);
1552 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0))
1553 in6_dev_hold(idev);
1554 skb = NULL;
1555 }
1556 spin_unlock_bh(&idev->mc_report_lock);
1557out:
1558 kfree_skb(skb);
1559}
1560
1561static void __mld_report_work(struct sk_buff *skb)
1562{
1563 struct inet6_dev *idev;
1564 struct ifmcaddr6 *ma;
1565 struct mld_msg *mld;
1566 int addr_type;
1567
1568 /* Our own report looped back. Ignore it. */
1569 if (skb->pkt_type == PACKET_LOOPBACK)
1570 goto kfree_skb;
1571
1572 /* send our report if the MC router may not have heard this report */
1573 if (skb->pkt_type != PACKET_MULTICAST &&
1574 skb->pkt_type != PACKET_BROADCAST)
1575 goto kfree_skb;
1576
1577 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1578 goto kfree_skb;
1579
1580 mld = (struct mld_msg *)icmp6_hdr(skb);
1581
1582 /* Drop reports with not link local source */
1583 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1584 if (addr_type != IPV6_ADDR_ANY &&
1585 !(addr_type&IPV6_ADDR_LINKLOCAL))
1586 goto kfree_skb;
1587
1588 idev = in6_dev_get(skb->dev);
1589 if (!idev)
1590 goto kfree_skb;
1591
1592 /*
1593 * Cancel the work for this group
1594 */
1595
1596 for_each_mc_mclock(idev, ma) {
1597 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1598 if (cancel_delayed_work(&ma->mca_work))
1599 refcount_dec(&ma->mca_refcnt);
1600 ma->mca_flags &= ~(MAF_LAST_REPORTER |
1601 MAF_TIMER_RUNNING);
1602 break;
1603 }
1604 }
1605
1606 in6_dev_put(idev);
1607kfree_skb:
1608 consume_skb(skb);
1609}
1610
1611static void mld_report_work(struct work_struct *work)
1612{
1613 struct inet6_dev *idev = container_of(to_delayed_work(work),
1614 struct inet6_dev,
1615 mc_report_work);
1616 struct sk_buff_head q;
1617 struct sk_buff *skb;
1618 bool rework = false;
1619 int cnt = 0;
1620
1621 skb_queue_head_init(&q);
1622 spin_lock_bh(&idev->mc_report_lock);
1623 while ((skb = __skb_dequeue(&idev->mc_report_queue))) {
1624 __skb_queue_tail(&q, skb);
1625
1626 if (++cnt >= MLD_MAX_QUEUE) {
1627 rework = true;
1628 break;
1629 }
1630 }
1631 spin_unlock_bh(&idev->mc_report_lock);
1632
1633 mutex_lock(&idev->mc_lock);
1634 while ((skb = __skb_dequeue(&q)))
1635 __mld_report_work(skb);
1636 mutex_unlock(&idev->mc_lock);
1637
1638 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0))
1639 return;
1640
1641 in6_dev_put(idev);
1642}
1643
1644static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1645 int gdeleted, int sdeleted)
1646{
1647 switch (type) {
1648 case MLD2_MODE_IS_INCLUDE:
1649 case MLD2_MODE_IS_EXCLUDE:
1650 if (gdeleted || sdeleted)
1651 return false;
1652 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1653 if (pmc->mca_sfmode == MCAST_INCLUDE)
1654 return true;
1655 /* don't include if this source is excluded
1656 * in all filters
1657 */
1658 if (psf->sf_count[MCAST_INCLUDE])
1659 return type == MLD2_MODE_IS_INCLUDE;
1660 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1661 psf->sf_count[MCAST_EXCLUDE];
1662 }
1663 return false;
1664 case MLD2_CHANGE_TO_INCLUDE:
1665 if (gdeleted || sdeleted)
1666 return false;
1667 return psf->sf_count[MCAST_INCLUDE] != 0;
1668 case MLD2_CHANGE_TO_EXCLUDE:
1669 if (gdeleted || sdeleted)
1670 return false;
1671 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1672 psf->sf_count[MCAST_INCLUDE])
1673 return false;
1674 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1675 psf->sf_count[MCAST_EXCLUDE];
1676 case MLD2_ALLOW_NEW_SOURCES:
1677 if (gdeleted || !psf->sf_crcount)
1678 return false;
1679 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1680 case MLD2_BLOCK_OLD_SOURCES:
1681 if (pmc->mca_sfmode == MCAST_INCLUDE)
1682 return gdeleted || (psf->sf_crcount && sdeleted);
1683 return psf->sf_crcount && !gdeleted && !sdeleted;
1684 }
1685 return false;
1686}
1687
1688static int
1689mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1690{
1691 struct ip6_sf_list *psf;
1692 int scount = 0;
1693
1694 for_each_psf_mclock(pmc, psf) {
1695 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1696 continue;
1697 scount++;
1698 }
1699 return scount;
1700}
1701
1702static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb,
1703 struct net_device *dev, const struct in6_addr *saddr,
1704 const struct in6_addr *daddr, int proto, int len)
1705{
1706 struct ipv6hdr *hdr;
1707
1708 skb->protocol = htons(ETH_P_IPV6);
1709 skb->dev = dev;
1710
1711 skb_reset_network_header(skb);
1712 skb_put(skb, sizeof(struct ipv6hdr));
1713 hdr = ipv6_hdr(skb);
1714
1715 ip6_flow_hdr(hdr, 0, 0);
1716
1717 hdr->payload_len = htons(len);
1718 hdr->nexthdr = proto;
1719 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit);
1720
1721 hdr->saddr = *saddr;
1722 hdr->daddr = *daddr;
1723}
1724
1725static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1726{
1727 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1728 2, 0, 0, IPV6_TLV_PADN, 0 };
1729 struct net_device *dev = idev->dev;
1730 int hlen = LL_RESERVED_SPACE(dev);
1731 int tlen = dev->needed_tailroom;
1732 struct net *net = dev_net(dev);
1733 const struct in6_addr *saddr;
1734 struct in6_addr addr_buf;
1735 struct mld2_report *pmr;
1736 struct sk_buff *skb;
1737 unsigned int size;
1738 struct sock *sk;
1739 int err;
1740
1741 sk = net->ipv6.igmp_sk;
1742 /* we assume size > sizeof(ra) here
1743 * Also try to not allocate high-order pages for big MTU
1744 */
1745 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
1746 skb = sock_alloc_send_skb(sk, size, 1, &err);
1747 if (!skb)
1748 return NULL;
1749
1750 skb->priority = TC_PRIO_CONTROL;
1751 skb_reserve(skb, hlen);
1752 skb_tailroom_reserve(skb, mtu, tlen);
1753
1754 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1755 /* <draft-ietf-magma-mld-source-05.txt>:
1756 * use unspecified address as the source address
1757 * when a valid link-local address is not available.
1758 */
1759 saddr = &in6addr_any;
1760 } else
1761 saddr = &addr_buf;
1762
1763 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1764
1765 skb_put_data(skb, ra, sizeof(ra));
1766
1767 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1768 skb_put(skb, sizeof(*pmr));
1769 pmr = (struct mld2_report *)skb_transport_header(skb);
1770 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1771 pmr->mld2r_resv1 = 0;
1772 pmr->mld2r_cksum = 0;
1773 pmr->mld2r_resv2 = 0;
1774 pmr->mld2r_ngrec = 0;
1775 return skb;
1776}
1777
1778static void mld_sendpack(struct sk_buff *skb)
1779{
1780 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1781 struct mld2_report *pmr =
1782 (struct mld2_report *)skb_transport_header(skb);
1783 int payload_len, mldlen;
1784 struct inet6_dev *idev;
1785 struct net *net = dev_net(skb->dev);
1786 int err;
1787 struct flowi6 fl6;
1788 struct dst_entry *dst;
1789
1790 rcu_read_lock();
1791 idev = __in6_dev_get(skb->dev);
1792 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
1793
1794 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1795 sizeof(*pip6);
1796 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1797 pip6->payload_len = htons(payload_len);
1798
1799 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1800 IPPROTO_ICMPV6,
1801 csum_partial(skb_transport_header(skb),
1802 mldlen, 0));
1803
1804 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1805 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1806 skb->dev->ifindex);
1807 dst = icmp6_dst_alloc(skb->dev, &fl6);
1808
1809 err = 0;
1810 if (IS_ERR(dst)) {
1811 err = PTR_ERR(dst);
1812 dst = NULL;
1813 }
1814 skb_dst_set(skb, dst);
1815 if (err)
1816 goto err_out;
1817
1818 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1819 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1820 dst_output);
1821out:
1822 if (!err) {
1823 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1824 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1825 } else {
1826 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1827 }
1828
1829 rcu_read_unlock();
1830 return;
1831
1832err_out:
1833 kfree_skb(skb);
1834 goto out;
1835}
1836
1837static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1838{
1839 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1840}
1841
1842static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1843 int type, struct mld2_grec **ppgr, unsigned int mtu)
1844{
1845 struct mld2_report *pmr;
1846 struct mld2_grec *pgr;
1847
1848 if (!skb) {
1849 skb = mld_newpack(pmc->idev, mtu);
1850 if (!skb)
1851 return NULL;
1852 }
1853 pgr = skb_put(skb, sizeof(struct mld2_grec));
1854 pgr->grec_type = type;
1855 pgr->grec_auxwords = 0;
1856 pgr->grec_nsrcs = 0;
1857 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1858 pmr = (struct mld2_report *)skb_transport_header(skb);
1859 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1860 *ppgr = pgr;
1861 return skb;
1862}
1863
1864#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1865
1866/* called with mc_lock */
1867static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1868 int type, int gdeleted, int sdeleted,
1869 int crsend)
1870{
1871 struct ip6_sf_list *psf, *psf_prev, *psf_next;
1872 int scount, stotal, first, isquery, truncate;
1873 struct ip6_sf_list __rcu **psf_list;
1874 struct inet6_dev *idev = pmc->idev;
1875 struct net_device *dev = idev->dev;
1876 struct mld2_grec *pgr = NULL;
1877 struct mld2_report *pmr;
1878 unsigned int mtu;
1879
1880 if (pmc->mca_flags & MAF_NOREPORT)
1881 return skb;
1882
1883 mtu = READ_ONCE(dev->mtu);
1884 if (mtu < IPV6_MIN_MTU)
1885 return skb;
1886
1887 isquery = type == MLD2_MODE_IS_INCLUDE ||
1888 type == MLD2_MODE_IS_EXCLUDE;
1889 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1890 type == MLD2_CHANGE_TO_EXCLUDE;
1891
1892 stotal = scount = 0;
1893
1894 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1895
1896 if (!rcu_access_pointer(*psf_list))
1897 goto empty_source;
1898
1899 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1900
1901 /* EX and TO_EX get a fresh packet, if needed */
1902 if (truncate) {
1903 if (pmr && pmr->mld2r_ngrec &&
1904 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1905 if (skb)
1906 mld_sendpack(skb);
1907 skb = mld_newpack(idev, mtu);
1908 }
1909 }
1910 first = 1;
1911 psf_prev = NULL;
1912 for (psf = mc_dereference(*psf_list, idev);
1913 psf;
1914 psf = psf_next) {
1915 struct in6_addr *psrc;
1916
1917 psf_next = mc_dereference(psf->sf_next, idev);
1918
1919 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1920 psf_prev = psf;
1921 continue;
1922 }
1923
1924 /* Based on RFC3810 6.1. Should not send source-list change
1925 * records when there is a filter mode change.
1926 */
1927 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1928 (!gdeleted && pmc->mca_crcount)) &&
1929 (type == MLD2_ALLOW_NEW_SOURCES ||
1930 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1931 goto decrease_sf_crcount;
1932
1933 /* clear marks on query responses */
1934 if (isquery)
1935 psf->sf_gsresp = 0;
1936
1937 if (AVAILABLE(skb) < sizeof(*psrc) +
1938 first*sizeof(struct mld2_grec)) {
1939 if (truncate && !first)
1940 break; /* truncate these */
1941 if (pgr)
1942 pgr->grec_nsrcs = htons(scount);
1943 if (skb)
1944 mld_sendpack(skb);
1945 skb = mld_newpack(idev, mtu);
1946 first = 1;
1947 scount = 0;
1948 }
1949 if (first) {
1950 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1951 first = 0;
1952 }
1953 if (!skb)
1954 return NULL;
1955 psrc = skb_put(skb, sizeof(*psrc));
1956 *psrc = psf->sf_addr;
1957 scount++; stotal++;
1958 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1959 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1960decrease_sf_crcount:
1961 psf->sf_crcount--;
1962 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1963 if (psf_prev)
1964 rcu_assign_pointer(psf_prev->sf_next,
1965 mc_dereference(psf->sf_next, idev));
1966 else
1967 rcu_assign_pointer(*psf_list,
1968 mc_dereference(psf->sf_next, idev));
1969 kfree_rcu(psf, rcu);
1970 continue;
1971 }
1972 }
1973 psf_prev = psf;
1974 }
1975
1976empty_source:
1977 if (!stotal) {
1978 if (type == MLD2_ALLOW_NEW_SOURCES ||
1979 type == MLD2_BLOCK_OLD_SOURCES)
1980 return skb;
1981 if (pmc->mca_crcount || isquery || crsend) {
1982 /* make sure we have room for group header */
1983 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1984 mld_sendpack(skb);
1985 skb = NULL; /* add_grhead will get a new one */
1986 }
1987 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1988 }
1989 }
1990 if (pgr)
1991 pgr->grec_nsrcs = htons(scount);
1992
1993 if (isquery)
1994 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1995 return skb;
1996}
1997
1998/* called with mc_lock */
1999static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2000{
2001 struct sk_buff *skb = NULL;
2002 int type;
2003
2004 if (!pmc) {
2005 for_each_mc_mclock(idev, pmc) {
2006 if (pmc->mca_flags & MAF_NOREPORT)
2007 continue;
2008 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2009 type = MLD2_MODE_IS_EXCLUDE;
2010 else
2011 type = MLD2_MODE_IS_INCLUDE;
2012 skb = add_grec(skb, pmc, type, 0, 0, 0);
2013 }
2014 } else {
2015 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2016 type = MLD2_MODE_IS_EXCLUDE;
2017 else
2018 type = MLD2_MODE_IS_INCLUDE;
2019 skb = add_grec(skb, pmc, type, 0, 0, 0);
2020 }
2021 if (skb)
2022 mld_sendpack(skb);
2023}
2024
2025/*
2026 * remove zero-count source records from a source filter list
2027 * called with mc_lock
2028 */
2029static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
2030{
2031 struct ip6_sf_list *psf_prev, *psf_next, *psf;
2032
2033 psf_prev = NULL;
2034 for (psf = mc_dereference(*ppsf, idev);
2035 psf;
2036 psf = psf_next) {
2037 psf_next = mc_dereference(psf->sf_next, idev);
2038 if (psf->sf_crcount == 0) {
2039 if (psf_prev)
2040 rcu_assign_pointer(psf_prev->sf_next,
2041 mc_dereference(psf->sf_next, idev));
2042 else
2043 rcu_assign_pointer(*ppsf,
2044 mc_dereference(psf->sf_next, idev));
2045 kfree_rcu(psf, rcu);
2046 } else {
2047 psf_prev = psf;
2048 }
2049 }
2050}
2051
2052/* called with mc_lock */
2053static void mld_send_cr(struct inet6_dev *idev)
2054{
2055 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2056 struct sk_buff *skb = NULL;
2057 int type, dtype;
2058
2059 /* deleted MCA's */
2060 pmc_prev = NULL;
2061 for (pmc = mc_dereference(idev->mc_tomb, idev);
2062 pmc;
2063 pmc = pmc_next) {
2064 pmc_next = mc_dereference(pmc->next, idev);
2065 if (pmc->mca_sfmode == MCAST_INCLUDE) {
2066 type = MLD2_BLOCK_OLD_SOURCES;
2067 dtype = MLD2_BLOCK_OLD_SOURCES;
2068 skb = add_grec(skb, pmc, type, 1, 0, 0);
2069 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
2070 }
2071 if (pmc->mca_crcount) {
2072 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2073 type = MLD2_CHANGE_TO_INCLUDE;
2074 skb = add_grec(skb, pmc, type, 1, 0, 0);
2075 }
2076 pmc->mca_crcount--;
2077 if (pmc->mca_crcount == 0) {
2078 mld_clear_zeros(&pmc->mca_tomb, idev);
2079 mld_clear_zeros(&pmc->mca_sources, idev);
2080 }
2081 }
2082 if (pmc->mca_crcount == 0 &&
2083 !rcu_access_pointer(pmc->mca_tomb) &&
2084 !rcu_access_pointer(pmc->mca_sources)) {
2085 if (pmc_prev)
2086 rcu_assign_pointer(pmc_prev->next, pmc_next);
2087 else
2088 rcu_assign_pointer(idev->mc_tomb, pmc_next);
2089 in6_dev_put(pmc->idev);
2090 kfree_rcu(pmc, rcu);
2091 } else
2092 pmc_prev = pmc;
2093 }
2094
2095 /* change recs */
2096 for_each_mc_mclock(idev, pmc) {
2097 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2098 type = MLD2_BLOCK_OLD_SOURCES;
2099 dtype = MLD2_ALLOW_NEW_SOURCES;
2100 } else {
2101 type = MLD2_ALLOW_NEW_SOURCES;
2102 dtype = MLD2_BLOCK_OLD_SOURCES;
2103 }
2104 skb = add_grec(skb, pmc, type, 0, 0, 0);
2105 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
2106
2107 /* filter mode changes */
2108 if (pmc->mca_crcount) {
2109 if (pmc->mca_sfmode == MCAST_EXCLUDE)
2110 type = MLD2_CHANGE_TO_EXCLUDE;
2111 else
2112 type = MLD2_CHANGE_TO_INCLUDE;
2113 skb = add_grec(skb, pmc, type, 0, 0, 0);
2114 pmc->mca_crcount--;
2115 }
2116 }
2117 if (!skb)
2118 return;
2119 (void) mld_sendpack(skb);
2120}
2121
2122static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2123{
2124 struct net *net = dev_net(dev);
2125 struct sock *sk = net->ipv6.igmp_sk;
2126 struct inet6_dev *idev;
2127 struct sk_buff *skb;
2128 struct mld_msg *hdr;
2129 const struct in6_addr *snd_addr, *saddr;
2130 struct in6_addr addr_buf;
2131 int hlen = LL_RESERVED_SPACE(dev);
2132 int tlen = dev->needed_tailroom;
2133 int err, len, payload_len, full_len;
2134 u8 ra[8] = { IPPROTO_ICMPV6, 0,
2135 IPV6_TLV_ROUTERALERT, 2, 0, 0,
2136 IPV6_TLV_PADN, 0 };
2137 struct flowi6 fl6;
2138 struct dst_entry *dst;
2139
2140 if (type == ICMPV6_MGM_REDUCTION)
2141 snd_addr = &in6addr_linklocal_allrouters;
2142 else
2143 snd_addr = addr;
2144
2145 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2146 payload_len = len + sizeof(ra);
2147 full_len = sizeof(struct ipv6hdr) + payload_len;
2148
2149 rcu_read_lock();
2150 IP6_INC_STATS(net, __in6_dev_get(dev), IPSTATS_MIB_OUTREQUESTS);
2151 rcu_read_unlock();
2152
2153 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2154
2155 if (!skb) {
2156 rcu_read_lock();
2157 IP6_INC_STATS(net, __in6_dev_get(dev),
2158 IPSTATS_MIB_OUTDISCARDS);
2159 rcu_read_unlock();
2160 return;
2161 }
2162 skb->priority = TC_PRIO_CONTROL;
2163 skb_reserve(skb, hlen);
2164
2165 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2166 /* <draft-ietf-magma-mld-source-05.txt>:
2167 * use unspecified address as the source address
2168 * when a valid link-local address is not available.
2169 */
2170 saddr = &in6addr_any;
2171 } else
2172 saddr = &addr_buf;
2173
2174 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2175
2176 skb_put_data(skb, ra, sizeof(ra));
2177
2178 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2179 hdr->mld_type = type;
2180 hdr->mld_mca = *addr;
2181
2182 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2183 IPPROTO_ICMPV6,
2184 csum_partial(hdr, len, 0));
2185
2186 rcu_read_lock();
2187 idev = __in6_dev_get(skb->dev);
2188
2189 icmpv6_flow_init(sk, &fl6, type,
2190 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2191 skb->dev->ifindex);
2192 dst = icmp6_dst_alloc(skb->dev, &fl6);
2193 if (IS_ERR(dst)) {
2194 err = PTR_ERR(dst);
2195 goto err_out;
2196 }
2197
2198 skb_dst_set(skb, dst);
2199 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2200 net, sk, skb, NULL, skb->dev,
2201 dst_output);
2202out:
2203 if (!err) {
2204 ICMP6MSGOUT_INC_STATS(net, idev, type);
2205 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2206 } else
2207 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2208
2209 rcu_read_unlock();
2210 return;
2211
2212err_out:
2213 kfree_skb(skb);
2214 goto out;
2215}
2216
2217/* called with mc_lock */
2218static void mld_send_initial_cr(struct inet6_dev *idev)
2219{
2220 struct sk_buff *skb;
2221 struct ifmcaddr6 *pmc;
2222 int type;
2223
2224 if (mld_in_v1_mode(idev))
2225 return;
2226
2227 skb = NULL;
2228 for_each_mc_mclock(idev, pmc) {
2229 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2230 type = MLD2_CHANGE_TO_EXCLUDE;
2231 else
2232 type = MLD2_ALLOW_NEW_SOURCES;
2233 skb = add_grec(skb, pmc, type, 0, 0, 1);
2234 }
2235 if (skb)
2236 mld_sendpack(skb);
2237}
2238
2239void ipv6_mc_dad_complete(struct inet6_dev *idev)
2240{
2241 mutex_lock(&idev->mc_lock);
2242 idev->mc_dad_count = idev->mc_qrv;
2243 if (idev->mc_dad_count) {
2244 mld_send_initial_cr(idev);
2245 idev->mc_dad_count--;
2246 if (idev->mc_dad_count)
2247 mld_dad_start_work(idev,
2248 unsolicited_report_interval(idev));
2249 }
2250 mutex_unlock(&idev->mc_lock);
2251}
2252
2253static void mld_dad_work(struct work_struct *work)
2254{
2255 struct inet6_dev *idev = container_of(to_delayed_work(work),
2256 struct inet6_dev,
2257 mc_dad_work);
2258 mutex_lock(&idev->mc_lock);
2259 mld_send_initial_cr(idev);
2260 if (idev->mc_dad_count) {
2261 idev->mc_dad_count--;
2262 if (idev->mc_dad_count)
2263 mld_dad_start_work(idev,
2264 unsolicited_report_interval(idev));
2265 }
2266 mutex_unlock(&idev->mc_lock);
2267 in6_dev_put(idev);
2268}
2269
2270/* called with mc_lock */
2271static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2272 const struct in6_addr *psfsrc)
2273{
2274 struct ip6_sf_list *psf, *psf_prev;
2275 int rv = 0;
2276
2277 psf_prev = NULL;
2278 for_each_psf_mclock(pmc, psf) {
2279 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2280 break;
2281 psf_prev = psf;
2282 }
2283 if (!psf || psf->sf_count[sfmode] == 0) {
2284 /* source filter not found, or count wrong => bug */
2285 return -ESRCH;
2286 }
2287 psf->sf_count[sfmode]--;
2288 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2289 struct inet6_dev *idev = pmc->idev;
2290
2291 /* no more filters for this source */
2292 if (psf_prev)
2293 rcu_assign_pointer(psf_prev->sf_next,
2294 mc_dereference(psf->sf_next, idev));
2295 else
2296 rcu_assign_pointer(pmc->mca_sources,
2297 mc_dereference(psf->sf_next, idev));
2298
2299 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2300 !mld_in_v1_mode(idev)) {
2301 psf->sf_crcount = idev->mc_qrv;
2302 rcu_assign_pointer(psf->sf_next,
2303 mc_dereference(pmc->mca_tomb, idev));
2304 rcu_assign_pointer(pmc->mca_tomb, psf);
2305 rv = 1;
2306 } else {
2307 kfree_rcu(psf, rcu);
2308 }
2309 }
2310 return rv;
2311}
2312
2313/* called with mc_lock */
2314static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2315 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2316 int delta)
2317{
2318 struct ifmcaddr6 *pmc;
2319 int changerec = 0;
2320 int i, err;
2321
2322 if (!idev)
2323 return -ENODEV;
2324
2325 for_each_mc_mclock(idev, pmc) {
2326 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2327 break;
2328 }
2329 if (!pmc)
2330 return -ESRCH;
2331
2332 sf_markstate(pmc);
2333 if (!delta) {
2334 if (!pmc->mca_sfcount[sfmode])
2335 return -EINVAL;
2336
2337 pmc->mca_sfcount[sfmode]--;
2338 }
2339 err = 0;
2340 for (i = 0; i < sfcount; i++) {
2341 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2342
2343 changerec |= rv > 0;
2344 if (!err && rv < 0)
2345 err = rv;
2346 }
2347 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2348 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2349 pmc->mca_sfcount[MCAST_INCLUDE]) {
2350 struct ip6_sf_list *psf;
2351
2352 /* filter mode change */
2353 pmc->mca_sfmode = MCAST_INCLUDE;
2354 pmc->mca_crcount = idev->mc_qrv;
2355 idev->mc_ifc_count = pmc->mca_crcount;
2356 for_each_psf_mclock(pmc, psf)
2357 psf->sf_crcount = 0;
2358 mld_ifc_event(pmc->idev);
2359 } else if (sf_setstate(pmc) || changerec) {
2360 mld_ifc_event(pmc->idev);
2361 }
2362
2363 return err;
2364}
2365
2366/*
2367 * Add multicast single-source filter to the interface list
2368 * called with mc_lock
2369 */
2370static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2371 const struct in6_addr *psfsrc)
2372{
2373 struct ip6_sf_list *psf, *psf_prev;
2374
2375 psf_prev = NULL;
2376 for_each_psf_mclock(pmc, psf) {
2377 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2378 break;
2379 psf_prev = psf;
2380 }
2381 if (!psf) {
2382 psf = kzalloc(sizeof(*psf), GFP_KERNEL);
2383 if (!psf)
2384 return -ENOBUFS;
2385
2386 psf->sf_addr = *psfsrc;
2387 if (psf_prev) {
2388 rcu_assign_pointer(psf_prev->sf_next, psf);
2389 } else {
2390 rcu_assign_pointer(pmc->mca_sources, psf);
2391 }
2392 }
2393 psf->sf_count[sfmode]++;
2394 return 0;
2395}
2396
2397/* called with mc_lock */
2398static void sf_markstate(struct ifmcaddr6 *pmc)
2399{
2400 struct ip6_sf_list *psf;
2401 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2402
2403 for_each_psf_mclock(pmc, psf) {
2404 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2405 psf->sf_oldin = mca_xcount ==
2406 psf->sf_count[MCAST_EXCLUDE] &&
2407 !psf->sf_count[MCAST_INCLUDE];
2408 } else {
2409 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2410 }
2411 }
2412}
2413
2414/* called with mc_lock */
2415static int sf_setstate(struct ifmcaddr6 *pmc)
2416{
2417 struct ip6_sf_list *psf, *dpsf;
2418 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2419 int qrv = pmc->idev->mc_qrv;
2420 int new_in, rv;
2421
2422 rv = 0;
2423 for_each_psf_mclock(pmc, psf) {
2424 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2425 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2426 !psf->sf_count[MCAST_INCLUDE];
2427 } else
2428 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2429 if (new_in) {
2430 if (!psf->sf_oldin) {
2431 struct ip6_sf_list *prev = NULL;
2432
2433 for_each_psf_tomb(pmc, dpsf) {
2434 if (ipv6_addr_equal(&dpsf->sf_addr,
2435 &psf->sf_addr))
2436 break;
2437 prev = dpsf;
2438 }
2439 if (dpsf) {
2440 if (prev)
2441 rcu_assign_pointer(prev->sf_next,
2442 mc_dereference(dpsf->sf_next,
2443 pmc->idev));
2444 else
2445 rcu_assign_pointer(pmc->mca_tomb,
2446 mc_dereference(dpsf->sf_next,
2447 pmc->idev));
2448 kfree_rcu(dpsf, rcu);
2449 }
2450 psf->sf_crcount = qrv;
2451 rv++;
2452 }
2453 } else if (psf->sf_oldin) {
2454 psf->sf_crcount = 0;
2455 /*
2456 * add or update "delete" records if an active filter
2457 * is now inactive
2458 */
2459
2460 for_each_psf_tomb(pmc, dpsf)
2461 if (ipv6_addr_equal(&dpsf->sf_addr,
2462 &psf->sf_addr))
2463 break;
2464 if (!dpsf) {
2465 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL);
2466 if (!dpsf)
2467 continue;
2468 *dpsf = *psf;
2469 rcu_assign_pointer(dpsf->sf_next,
2470 mc_dereference(pmc->mca_tomb, pmc->idev));
2471 rcu_assign_pointer(pmc->mca_tomb, dpsf);
2472 }
2473 dpsf->sf_crcount = qrv;
2474 rv++;
2475 }
2476 }
2477 return rv;
2478}
2479
2480/*
2481 * Add multicast source filter list to the interface list
2482 * called with mc_lock
2483 */
2484static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2485 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2486 int delta)
2487{
2488 struct ifmcaddr6 *pmc;
2489 int isexclude;
2490 int i, err;
2491
2492 if (!idev)
2493 return -ENODEV;
2494
2495 for_each_mc_mclock(idev, pmc) {
2496 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2497 break;
2498 }
2499 if (!pmc)
2500 return -ESRCH;
2501
2502 sf_markstate(pmc);
2503 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2504 if (!delta)
2505 pmc->mca_sfcount[sfmode]++;
2506 err = 0;
2507 for (i = 0; i < sfcount; i++) {
2508 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2509 if (err)
2510 break;
2511 }
2512 if (err) {
2513 int j;
2514
2515 if (!delta)
2516 pmc->mca_sfcount[sfmode]--;
2517 for (j = 0; j < i; j++)
2518 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2519 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2520 struct ip6_sf_list *psf;
2521
2522 /* filter mode change */
2523 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2524 pmc->mca_sfmode = MCAST_EXCLUDE;
2525 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2526 pmc->mca_sfmode = MCAST_INCLUDE;
2527 /* else no filters; keep old mode for reports */
2528
2529 pmc->mca_crcount = idev->mc_qrv;
2530 idev->mc_ifc_count = pmc->mca_crcount;
2531 for_each_psf_mclock(pmc, psf)
2532 psf->sf_crcount = 0;
2533 mld_ifc_event(idev);
2534 } else if (sf_setstate(pmc)) {
2535 mld_ifc_event(idev);
2536 }
2537 return err;
2538}
2539
2540/* called with mc_lock */
2541static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2542{
2543 struct ip6_sf_list *psf, *nextpsf;
2544
2545 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev);
2546 psf;
2547 psf = nextpsf) {
2548 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2549 kfree_rcu(psf, rcu);
2550 }
2551 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
2552 for (psf = mc_dereference(pmc->mca_sources, pmc->idev);
2553 psf;
2554 psf = nextpsf) {
2555 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2556 kfree_rcu(psf, rcu);
2557 }
2558 RCU_INIT_POINTER(pmc->mca_sources, NULL);
2559 pmc->mca_sfmode = MCAST_EXCLUDE;
2560 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2561 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2562}
2563
2564/* called with mc_lock */
2565static void igmp6_join_group(struct ifmcaddr6 *ma)
2566{
2567 unsigned long delay;
2568
2569 if (ma->mca_flags & MAF_NOREPORT)
2570 return;
2571
2572 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2573
2574 delay = get_random_u32_below(unsolicited_report_interval(ma->idev));
2575
2576 if (cancel_delayed_work(&ma->mca_work)) {
2577 refcount_dec(&ma->mca_refcnt);
2578 delay = ma->mca_work.timer.expires - jiffies;
2579 }
2580
2581 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
2582 refcount_inc(&ma->mca_refcnt);
2583 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2584}
2585
2586static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2587 struct inet6_dev *idev)
2588{
2589 struct ip6_sf_socklist *psl;
2590 int err;
2591
2592 psl = sock_dereference(iml->sflist, sk);
2593
2594 if (idev)
2595 mutex_lock(&idev->mc_lock);
2596
2597 if (!psl) {
2598 /* any-source empty exclude case */
2599 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2600 } else {
2601 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2602 psl->sl_count, psl->sl_addr, 0);
2603 RCU_INIT_POINTER(iml->sflist, NULL);
2604 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2605 &sk->sk_omem_alloc);
2606 kfree_rcu(psl, rcu);
2607 }
2608
2609 if (idev)
2610 mutex_unlock(&idev->mc_lock);
2611
2612 return err;
2613}
2614
2615/* called with mc_lock */
2616static void igmp6_leave_group(struct ifmcaddr6 *ma)
2617{
2618 if (mld_in_v1_mode(ma->idev)) {
2619 if (ma->mca_flags & MAF_LAST_REPORTER) {
2620 igmp6_send(&ma->mca_addr, ma->idev->dev,
2621 ICMPV6_MGM_REDUCTION);
2622 }
2623 } else {
2624 mld_add_delrec(ma->idev, ma);
2625 mld_ifc_event(ma->idev);
2626 }
2627}
2628
2629static void mld_gq_work(struct work_struct *work)
2630{
2631 struct inet6_dev *idev = container_of(to_delayed_work(work),
2632 struct inet6_dev,
2633 mc_gq_work);
2634
2635 mutex_lock(&idev->mc_lock);
2636 mld_send_report(idev, NULL);
2637 idev->mc_gq_running = 0;
2638 mutex_unlock(&idev->mc_lock);
2639
2640 in6_dev_put(idev);
2641}
2642
2643static void mld_ifc_work(struct work_struct *work)
2644{
2645 struct inet6_dev *idev = container_of(to_delayed_work(work),
2646 struct inet6_dev,
2647 mc_ifc_work);
2648
2649 mutex_lock(&idev->mc_lock);
2650 mld_send_cr(idev);
2651
2652 if (idev->mc_ifc_count) {
2653 idev->mc_ifc_count--;
2654 if (idev->mc_ifc_count)
2655 mld_ifc_start_work(idev,
2656 unsolicited_report_interval(idev));
2657 }
2658 mutex_unlock(&idev->mc_lock);
2659 in6_dev_put(idev);
2660}
2661
2662/* called with mc_lock */
2663static void mld_ifc_event(struct inet6_dev *idev)
2664{
2665 if (mld_in_v1_mode(idev))
2666 return;
2667
2668 idev->mc_ifc_count = idev->mc_qrv;
2669 mld_ifc_start_work(idev, 1);
2670}
2671
2672static void mld_mca_work(struct work_struct *work)
2673{
2674 struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2675 struct ifmcaddr6, mca_work);
2676
2677 mutex_lock(&ma->idev->mc_lock);
2678 if (mld_in_v1_mode(ma->idev))
2679 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2680 else
2681 mld_send_report(ma->idev, ma);
2682 ma->mca_flags |= MAF_LAST_REPORTER;
2683 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2684 mutex_unlock(&ma->idev->mc_lock);
2685
2686 ma_put(ma);
2687}
2688
2689/* Device changing type */
2690
2691void ipv6_mc_unmap(struct inet6_dev *idev)
2692{
2693 struct ifmcaddr6 *i;
2694
2695 /* Install multicast list, except for all-nodes (already installed) */
2696
2697 mutex_lock(&idev->mc_lock);
2698 for_each_mc_mclock(idev, i)
2699 igmp6_group_dropped(i);
2700 mutex_unlock(&idev->mc_lock);
2701}
2702
2703void ipv6_mc_remap(struct inet6_dev *idev)
2704{
2705 ipv6_mc_up(idev);
2706}
2707
2708/* Device going down */
2709void ipv6_mc_down(struct inet6_dev *idev)
2710{
2711 struct ifmcaddr6 *i;
2712
2713 mutex_lock(&idev->mc_lock);
2714 /* Withdraw multicast list */
2715 for_each_mc_mclock(idev, i)
2716 igmp6_group_dropped(i);
2717 mutex_unlock(&idev->mc_lock);
2718
2719 /* Should stop work after group drop. or we will
2720 * start work again in mld_ifc_event()
2721 */
2722 mld_query_stop_work(idev);
2723 mld_report_stop_work(idev);
2724
2725 mutex_lock(&idev->mc_lock);
2726 mld_ifc_stop_work(idev);
2727 mld_gq_stop_work(idev);
2728 mutex_unlock(&idev->mc_lock);
2729
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 psf = rcu_dereference(state->im->mca_sources);
3017 }
3018out:
3019 return psf;
3020}
3021
3022static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3023{
3024 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3025 if (psf)
3026 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3027 --pos;
3028 return pos ? NULL : psf;
3029}
3030
3031static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3032 __acquires(RCU)
3033{
3034 rcu_read_lock();
3035 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3036}
3037
3038static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3039{
3040 struct ip6_sf_list *psf;
3041 if (v == SEQ_START_TOKEN)
3042 psf = igmp6_mcf_get_first(seq);
3043 else
3044 psf = igmp6_mcf_get_next(seq, v);
3045 ++*pos;
3046 return psf;
3047}
3048
3049static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
3050 __releases(RCU)
3051{
3052 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3053
3054 if (likely(state->im))
3055 state->im = NULL;
3056 if (likely(state->idev))
3057 state->idev = NULL;
3058
3059 state->dev = NULL;
3060 rcu_read_unlock();
3061}
3062
3063static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3064{
3065 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3066 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3067
3068 if (v == SEQ_START_TOKEN) {
3069 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
3070 } else {
3071 seq_printf(seq,
3072 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
3073 state->dev->ifindex, state->dev->name,
3074 &state->im->mca_addr,
3075 &psf->sf_addr,
3076 psf->sf_count[MCAST_INCLUDE],
3077 psf->sf_count[MCAST_EXCLUDE]);
3078 }
3079 return 0;
3080}
3081
3082static const struct seq_operations igmp6_mcf_seq_ops = {
3083 .start = igmp6_mcf_seq_start,
3084 .next = igmp6_mcf_seq_next,
3085 .stop = igmp6_mcf_seq_stop,
3086 .show = igmp6_mcf_seq_show,
3087};
3088
3089static int __net_init igmp6_proc_init(struct net *net)
3090{
3091 int err;
3092
3093 err = -ENOMEM;
3094 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3095 sizeof(struct igmp6_mc_iter_state)))
3096 goto out;
3097 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3098 &igmp6_mcf_seq_ops,
3099 sizeof(struct igmp6_mcf_iter_state)))
3100 goto out_proc_net_igmp6;
3101
3102 err = 0;
3103out:
3104 return err;
3105
3106out_proc_net_igmp6:
3107 remove_proc_entry("igmp6", net->proc_net);
3108 goto out;
3109}
3110
3111static void __net_exit igmp6_proc_exit(struct net *net)
3112{
3113 remove_proc_entry("mcfilter6", net->proc_net);
3114 remove_proc_entry("igmp6", net->proc_net);
3115}
3116#else
3117static inline int igmp6_proc_init(struct net *net)
3118{
3119 return 0;
3120}
3121static inline void igmp6_proc_exit(struct net *net)
3122{
3123}
3124#endif
3125
3126static int __net_init igmp6_net_init(struct net *net)
3127{
3128 int err;
3129
3130 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3131 SOCK_RAW, IPPROTO_ICMPV6, net);
3132 if (err < 0) {
3133 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
3134 err);
3135 goto out;
3136 }
3137
3138 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
3139 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
3140
3141 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3142 SOCK_RAW, IPPROTO_ICMPV6, net);
3143 if (err < 0) {
3144 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3145 err);
3146 goto out_sock_create;
3147 }
3148
3149 err = igmp6_proc_init(net);
3150 if (err)
3151 goto out_sock_create_autojoin;
3152
3153 return 0;
3154
3155out_sock_create_autojoin:
3156 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3157out_sock_create:
3158 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3159out:
3160 return err;
3161}
3162
3163static void __net_exit igmp6_net_exit(struct net *net)
3164{
3165 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3166 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3167 igmp6_proc_exit(net);
3168}
3169
3170static struct pernet_operations igmp6_net_ops = {
3171 .init = igmp6_net_init,
3172 .exit = igmp6_net_exit,
3173};
3174
3175int __init igmp6_init(void)
3176{
3177 int err;
3178
3179 err = register_pernet_subsys(&igmp6_net_ops);
3180 if (err)
3181 return err;
3182
3183 mld_wq = create_workqueue("mld");
3184 if (!mld_wq) {
3185 unregister_pernet_subsys(&igmp6_net_ops);
3186 return -ENOMEM;
3187 }
3188
3189 return err;
3190}
3191
3192int __init igmp6_late_init(void)
3193{
3194 return register_netdevice_notifier(&igmp6_netdev_notifier);
3195}
3196
3197void igmp6_cleanup(void)
3198{
3199 unregister_pernet_subsys(&igmp6_net_ops);
3200 destroy_workqueue(mld_wq);
3201}
3202
3203void igmp6_late_cleanup(void)
3204{
3205 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3206}
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 = READ_ONCE(idev->cnf.mldv1_unsolicited_report_interval);
163 else
164 iv = READ_ONCE(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 unsigned int count;
590 int i, copycount;
591
592 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
593
594 if (!ipv6_addr_is_multicast(group))
595 return -EINVAL;
596
597 /* changes to the ipv6_mc_list require the socket lock and
598 * rtnl lock. We have the socket lock, so reading the list is safe.
599 */
600
601 for_each_pmc_socklock(inet6, sk, pmc) {
602 if (pmc->ifindex != gsf->gf_interface)
603 continue;
604 if (ipv6_addr_equal(group, &pmc->addr))
605 break;
606 }
607 if (!pmc) /* must have a prior join */
608 return -EADDRNOTAVAIL;
609
610 gsf->gf_fmode = pmc->sfmode;
611 psl = sock_dereference(pmc->sflist, sk);
612 count = psl ? psl->sl_count : 0;
613
614 copycount = min(count, gsf->gf_numsrc);
615 gsf->gf_numsrc = count;
616 for (i = 0; i < copycount; i++) {
617 struct sockaddr_in6 *psin6;
618 struct sockaddr_storage ss;
619
620 psin6 = (struct sockaddr_in6 *)&ss;
621 memset(&ss, 0, sizeof(ss));
622 psin6->sin6_family = AF_INET6;
623 psin6->sin6_addr = psl->sl_addr[i];
624 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss)))
625 return -EFAULT;
626 ss_offset += sizeof(ss);
627 }
628 return 0;
629}
630
631bool inet6_mc_check(const struct sock *sk, const struct in6_addr *mc_addr,
632 const struct in6_addr *src_addr)
633{
634 const struct ipv6_pinfo *np = inet6_sk(sk);
635 const struct ipv6_mc_socklist *mc;
636 const struct ip6_sf_socklist *psl;
637 bool rv = true;
638
639 rcu_read_lock();
640 for_each_pmc_rcu(np, mc) {
641 if (ipv6_addr_equal(&mc->addr, mc_addr))
642 break;
643 }
644 if (!mc) {
645 rcu_read_unlock();
646 return inet6_test_bit(MC6_ALL, sk);
647 }
648 psl = rcu_dereference(mc->sflist);
649 if (!psl) {
650 rv = mc->sfmode == MCAST_EXCLUDE;
651 } else {
652 int i;
653
654 for (i = 0; i < psl->sl_count; i++) {
655 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
656 break;
657 }
658 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
659 rv = false;
660 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
661 rv = false;
662 }
663 rcu_read_unlock();
664
665 return rv;
666}
667
668/* called with mc_lock */
669static void igmp6_group_added(struct ifmcaddr6 *mc)
670{
671 struct net_device *dev = mc->idev->dev;
672 char buf[MAX_ADDR_LEN];
673
674 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
675 IPV6_ADDR_SCOPE_LINKLOCAL)
676 return;
677
678 if (!(mc->mca_flags&MAF_LOADED)) {
679 mc->mca_flags |= MAF_LOADED;
680 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
681 dev_mc_add(dev, buf);
682 }
683
684 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
685 return;
686
687 if (mld_in_v1_mode(mc->idev)) {
688 igmp6_join_group(mc);
689 return;
690 }
691 /* else v2 */
692
693 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
694 * should not send filter-mode change record as the mode
695 * should be from IN() to IN(A).
696 */
697 if (mc->mca_sfmode == MCAST_EXCLUDE)
698 mc->mca_crcount = mc->idev->mc_qrv;
699
700 mld_ifc_event(mc->idev);
701}
702
703/* called with mc_lock */
704static void igmp6_group_dropped(struct ifmcaddr6 *mc)
705{
706 struct net_device *dev = mc->idev->dev;
707 char buf[MAX_ADDR_LEN];
708
709 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
710 IPV6_ADDR_SCOPE_LINKLOCAL)
711 return;
712
713 if (mc->mca_flags&MAF_LOADED) {
714 mc->mca_flags &= ~MAF_LOADED;
715 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
716 dev_mc_del(dev, buf);
717 }
718
719 if (mc->mca_flags & MAF_NOREPORT)
720 return;
721
722 if (!mc->idev->dead)
723 igmp6_leave_group(mc);
724
725 if (cancel_delayed_work(&mc->mca_work))
726 refcount_dec(&mc->mca_refcnt);
727}
728
729/*
730 * deleted ifmcaddr6 manipulation
731 * called with mc_lock
732 */
733static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
734{
735 struct ifmcaddr6 *pmc;
736
737 /* this is an "ifmcaddr6" for convenience; only the fields below
738 * are actually used. In particular, the refcnt and users are not
739 * used for management of the delete list. Using the same structure
740 * for deleted items allows change reports to use common code with
741 * non-deleted or query-response MCA's.
742 */
743 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
744 if (!pmc)
745 return;
746
747 pmc->idev = im->idev;
748 in6_dev_hold(idev);
749 pmc->mca_addr = im->mca_addr;
750 pmc->mca_crcount = idev->mc_qrv;
751 pmc->mca_sfmode = im->mca_sfmode;
752 if (pmc->mca_sfmode == MCAST_INCLUDE) {
753 struct ip6_sf_list *psf;
754
755 rcu_assign_pointer(pmc->mca_tomb,
756 mc_dereference(im->mca_tomb, idev));
757 rcu_assign_pointer(pmc->mca_sources,
758 mc_dereference(im->mca_sources, idev));
759 RCU_INIT_POINTER(im->mca_tomb, NULL);
760 RCU_INIT_POINTER(im->mca_sources, NULL);
761
762 for_each_psf_mclock(pmc, psf)
763 psf->sf_crcount = pmc->mca_crcount;
764 }
765
766 rcu_assign_pointer(pmc->next, idev->mc_tomb);
767 rcu_assign_pointer(idev->mc_tomb, pmc);
768}
769
770/* called with mc_lock */
771static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
772{
773 struct ip6_sf_list *psf, *sources, *tomb;
774 struct in6_addr *pmca = &im->mca_addr;
775 struct ifmcaddr6 *pmc, *pmc_prev;
776
777 pmc_prev = NULL;
778 for_each_mc_tomb(idev, pmc) {
779 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
780 break;
781 pmc_prev = pmc;
782 }
783 if (pmc) {
784 if (pmc_prev)
785 rcu_assign_pointer(pmc_prev->next, pmc->next);
786 else
787 rcu_assign_pointer(idev->mc_tomb, pmc->next);
788 }
789
790 if (pmc) {
791 im->idev = pmc->idev;
792 if (im->mca_sfmode == MCAST_INCLUDE) {
793 tomb = rcu_replace_pointer(im->mca_tomb,
794 mc_dereference(pmc->mca_tomb, pmc->idev),
795 lockdep_is_held(&im->idev->mc_lock));
796 rcu_assign_pointer(pmc->mca_tomb, tomb);
797
798 sources = rcu_replace_pointer(im->mca_sources,
799 mc_dereference(pmc->mca_sources, pmc->idev),
800 lockdep_is_held(&im->idev->mc_lock));
801 rcu_assign_pointer(pmc->mca_sources, sources);
802 for_each_psf_mclock(im, psf)
803 psf->sf_crcount = idev->mc_qrv;
804 } else {
805 im->mca_crcount = idev->mc_qrv;
806 }
807 in6_dev_put(pmc->idev);
808 ip6_mc_clear_src(pmc);
809 kfree_rcu(pmc, rcu);
810 }
811}
812
813/* called with mc_lock */
814static void mld_clear_delrec(struct inet6_dev *idev)
815{
816 struct ifmcaddr6 *pmc, *nextpmc;
817
818 pmc = mc_dereference(idev->mc_tomb, idev);
819 RCU_INIT_POINTER(idev->mc_tomb, NULL);
820
821 for (; pmc; pmc = nextpmc) {
822 nextpmc = mc_dereference(pmc->next, idev);
823 ip6_mc_clear_src(pmc);
824 in6_dev_put(pmc->idev);
825 kfree_rcu(pmc, rcu);
826 }
827
828 /* clear dead sources, too */
829 for_each_mc_mclock(idev, pmc) {
830 struct ip6_sf_list *psf, *psf_next;
831
832 psf = mc_dereference(pmc->mca_tomb, idev);
833 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
834 for (; psf; psf = psf_next) {
835 psf_next = mc_dereference(psf->sf_next, idev);
836 kfree_rcu(psf, rcu);
837 }
838 }
839}
840
841static void mld_clear_query(struct inet6_dev *idev)
842{
843 struct sk_buff *skb;
844
845 spin_lock_bh(&idev->mc_query_lock);
846 while ((skb = __skb_dequeue(&idev->mc_query_queue)))
847 kfree_skb(skb);
848 spin_unlock_bh(&idev->mc_query_lock);
849}
850
851static void mld_clear_report(struct inet6_dev *idev)
852{
853 struct sk_buff *skb;
854
855 spin_lock_bh(&idev->mc_report_lock);
856 while ((skb = __skb_dequeue(&idev->mc_report_queue)))
857 kfree_skb(skb);
858 spin_unlock_bh(&idev->mc_report_lock);
859}
860
861static void mca_get(struct ifmcaddr6 *mc)
862{
863 refcount_inc(&mc->mca_refcnt);
864}
865
866static void ma_put(struct ifmcaddr6 *mc)
867{
868 if (refcount_dec_and_test(&mc->mca_refcnt)) {
869 in6_dev_put(mc->idev);
870 kfree_rcu(mc, rcu);
871 }
872}
873
874/* called with mc_lock */
875static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
876 const struct in6_addr *addr,
877 unsigned int mode)
878{
879 struct ifmcaddr6 *mc;
880
881 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
882 if (!mc)
883 return NULL;
884
885 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work);
886
887 mc->mca_addr = *addr;
888 mc->idev = idev; /* reference taken by caller */
889 mc->mca_users = 1;
890 /* mca_stamp should be updated upon changes */
891 mc->mca_cstamp = mc->mca_tstamp = jiffies;
892 refcount_set(&mc->mca_refcnt, 1);
893
894 mc->mca_sfmode = mode;
895 mc->mca_sfcount[mode] = 1;
896
897 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
898 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
899 mc->mca_flags |= MAF_NOREPORT;
900
901 return mc;
902}
903
904/*
905 * device multicast group inc (add if not found)
906 */
907static int __ipv6_dev_mc_inc(struct net_device *dev,
908 const struct in6_addr *addr, unsigned int mode)
909{
910 struct ifmcaddr6 *mc;
911 struct inet6_dev *idev;
912
913 ASSERT_RTNL();
914
915 /* we need to take a reference on idev */
916 idev = in6_dev_get(dev);
917
918 if (!idev)
919 return -EINVAL;
920
921 if (idev->dead) {
922 in6_dev_put(idev);
923 return -ENODEV;
924 }
925
926 mutex_lock(&idev->mc_lock);
927 for_each_mc_mclock(idev, mc) {
928 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
929 mc->mca_users++;
930 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
931 mutex_unlock(&idev->mc_lock);
932 in6_dev_put(idev);
933 return 0;
934 }
935 }
936
937 mc = mca_alloc(idev, addr, mode);
938 if (!mc) {
939 mutex_unlock(&idev->mc_lock);
940 in6_dev_put(idev);
941 return -ENOMEM;
942 }
943
944 rcu_assign_pointer(mc->next, idev->mc_list);
945 rcu_assign_pointer(idev->mc_list, mc);
946
947 mca_get(mc);
948
949 mld_del_delrec(idev, mc);
950 igmp6_group_added(mc);
951 mutex_unlock(&idev->mc_lock);
952 ma_put(mc);
953 return 0;
954}
955
956int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
957{
958 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
959}
960EXPORT_SYMBOL(ipv6_dev_mc_inc);
961
962/*
963 * device multicast group del
964 */
965int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
966{
967 struct ifmcaddr6 *ma, __rcu **map;
968
969 ASSERT_RTNL();
970
971 mutex_lock(&idev->mc_lock);
972 for (map = &idev->mc_list;
973 (ma = mc_dereference(*map, idev));
974 map = &ma->next) {
975 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
976 if (--ma->mca_users == 0) {
977 *map = ma->next;
978
979 igmp6_group_dropped(ma);
980 ip6_mc_clear_src(ma);
981 mutex_unlock(&idev->mc_lock);
982
983 ma_put(ma);
984 return 0;
985 }
986 mutex_unlock(&idev->mc_lock);
987 return 0;
988 }
989 }
990
991 mutex_unlock(&idev->mc_lock);
992 return -ENOENT;
993}
994
995int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
996{
997 struct inet6_dev *idev;
998 int err;
999
1000 ASSERT_RTNL();
1001
1002 idev = __in6_dev_get(dev);
1003 if (!idev)
1004 err = -ENODEV;
1005 else
1006 err = __ipv6_dev_mc_dec(idev, addr);
1007
1008 return err;
1009}
1010EXPORT_SYMBOL(ipv6_dev_mc_dec);
1011
1012/*
1013 * check if the interface/address pair is valid
1014 */
1015bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1016 const struct in6_addr *src_addr)
1017{
1018 struct inet6_dev *idev;
1019 struct ifmcaddr6 *mc;
1020 bool rv = false;
1021
1022 rcu_read_lock();
1023 idev = __in6_dev_get(dev);
1024 if (idev) {
1025 for_each_mc_rcu(idev, mc) {
1026 if (ipv6_addr_equal(&mc->mca_addr, group))
1027 break;
1028 }
1029 if (mc) {
1030 if (src_addr && !ipv6_addr_any(src_addr)) {
1031 struct ip6_sf_list *psf;
1032
1033 for_each_psf_rcu(mc, psf) {
1034 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1035 break;
1036 }
1037 if (psf)
1038 rv = psf->sf_count[MCAST_INCLUDE] ||
1039 psf->sf_count[MCAST_EXCLUDE] !=
1040 mc->mca_sfcount[MCAST_EXCLUDE];
1041 else
1042 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1043 } else
1044 rv = true; /* don't filter unspecified source */
1045 }
1046 }
1047 rcu_read_unlock();
1048 return rv;
1049}
1050
1051/* called with mc_lock */
1052static void mld_gq_start_work(struct inet6_dev *idev)
1053{
1054 unsigned long tv = get_random_u32_below(idev->mc_maxdelay);
1055
1056 idev->mc_gq_running = 1;
1057 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
1058 in6_dev_hold(idev);
1059}
1060
1061/* called with mc_lock */
1062static void mld_gq_stop_work(struct inet6_dev *idev)
1063{
1064 idev->mc_gq_running = 0;
1065 if (cancel_delayed_work(&idev->mc_gq_work))
1066 __in6_dev_put(idev);
1067}
1068
1069/* called with mc_lock */
1070static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
1071{
1072 unsigned long tv = get_random_u32_below(delay);
1073
1074 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
1075 in6_dev_hold(idev);
1076}
1077
1078/* called with mc_lock */
1079static void mld_ifc_stop_work(struct inet6_dev *idev)
1080{
1081 idev->mc_ifc_count = 0;
1082 if (cancel_delayed_work(&idev->mc_ifc_work))
1083 __in6_dev_put(idev);
1084}
1085
1086/* called with mc_lock */
1087static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
1088{
1089 unsigned long tv = get_random_u32_below(delay);
1090
1091 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
1092 in6_dev_hold(idev);
1093}
1094
1095static void mld_dad_stop_work(struct inet6_dev *idev)
1096{
1097 if (cancel_delayed_work(&idev->mc_dad_work))
1098 __in6_dev_put(idev);
1099}
1100
1101static void mld_query_stop_work(struct inet6_dev *idev)
1102{
1103 spin_lock_bh(&idev->mc_query_lock);
1104 if (cancel_delayed_work(&idev->mc_query_work))
1105 __in6_dev_put(idev);
1106 spin_unlock_bh(&idev->mc_query_lock);
1107}
1108
1109static void mld_report_stop_work(struct inet6_dev *idev)
1110{
1111 if (cancel_delayed_work_sync(&idev->mc_report_work))
1112 __in6_dev_put(idev);
1113}
1114
1115/*
1116 * IGMP handling (alias multicast ICMPv6 messages)
1117 * called with mc_lock
1118 */
1119static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1120{
1121 unsigned long delay = resptime;
1122
1123 /* Do not start work for these addresses */
1124 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1125 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1126 return;
1127
1128 if (cancel_delayed_work(&ma->mca_work)) {
1129 refcount_dec(&ma->mca_refcnt);
1130 delay = ma->mca_work.timer.expires - jiffies;
1131 }
1132
1133 if (delay >= resptime)
1134 delay = get_random_u32_below(resptime);
1135
1136 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
1137 refcount_inc(&ma->mca_refcnt);
1138 ma->mca_flags |= MAF_TIMER_RUNNING;
1139}
1140
1141/* mark EXCLUDE-mode sources
1142 * called with mc_lock
1143 */
1144static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1145 const struct in6_addr *srcs)
1146{
1147 struct ip6_sf_list *psf;
1148 int i, scount;
1149
1150 scount = 0;
1151 for_each_psf_mclock(pmc, psf) {
1152 if (scount == nsrcs)
1153 break;
1154 for (i = 0; i < nsrcs; i++) {
1155 /* skip inactive filters */
1156 if (psf->sf_count[MCAST_INCLUDE] ||
1157 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1158 psf->sf_count[MCAST_EXCLUDE])
1159 break;
1160 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1161 scount++;
1162 break;
1163 }
1164 }
1165 }
1166 pmc->mca_flags &= ~MAF_GSQUERY;
1167 if (scount == nsrcs) /* all sources excluded */
1168 return false;
1169 return true;
1170}
1171
1172/* called with mc_lock */
1173static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1174 const struct in6_addr *srcs)
1175{
1176 struct ip6_sf_list *psf;
1177 int i, scount;
1178
1179 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1180 return mld_xmarksources(pmc, nsrcs, srcs);
1181
1182 /* mark INCLUDE-mode sources */
1183
1184 scount = 0;
1185 for_each_psf_mclock(pmc, psf) {
1186 if (scount == nsrcs)
1187 break;
1188 for (i = 0; i < nsrcs; i++) {
1189 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1190 psf->sf_gsresp = 1;
1191 scount++;
1192 break;
1193 }
1194 }
1195 }
1196 if (!scount) {
1197 pmc->mca_flags &= ~MAF_GSQUERY;
1198 return false;
1199 }
1200 pmc->mca_flags |= MAF_GSQUERY;
1201 return true;
1202}
1203
1204static int mld_force_mld_version(const struct inet6_dev *idev)
1205{
1206 const struct net *net = dev_net(idev->dev);
1207 int all_force;
1208
1209 all_force = READ_ONCE(net->ipv6.devconf_all->force_mld_version);
1210 /* Normally, both are 0 here. If enforcement to a particular is
1211 * being used, individual device enforcement will have a lower
1212 * precedence over 'all' device (.../conf/all/force_mld_version).
1213 */
1214 return all_force ?: READ_ONCE(idev->cnf.force_mld_version);
1215}
1216
1217static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1218{
1219 return mld_force_mld_version(idev) == 2;
1220}
1221
1222static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1223{
1224 return mld_force_mld_version(idev) == 1;
1225}
1226
1227static bool mld_in_v1_mode(const struct inet6_dev *idev)
1228{
1229 if (mld_in_v2_mode_only(idev))
1230 return false;
1231 if (mld_in_v1_mode_only(idev))
1232 return true;
1233 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1234 return true;
1235
1236 return false;
1237}
1238
1239static void mld_set_v1_mode(struct inet6_dev *idev)
1240{
1241 /* RFC3810, relevant sections:
1242 * - 9.1. Robustness Variable
1243 * - 9.2. Query Interval
1244 * - 9.3. Query Response Interval
1245 * - 9.12. Older Version Querier Present Timeout
1246 */
1247 unsigned long switchback;
1248
1249 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1250
1251 idev->mc_v1_seen = jiffies + switchback;
1252}
1253
1254static void mld_update_qrv(struct inet6_dev *idev,
1255 const struct mld2_query *mlh2)
1256{
1257 /* RFC3810, relevant sections:
1258 * - 5.1.8. QRV (Querier's Robustness Variable)
1259 * - 9.1. Robustness Variable
1260 */
1261
1262 /* The value of the Robustness Variable MUST NOT be zero,
1263 * and SHOULD NOT be one. Catch this here if we ever run
1264 * into such a case in future.
1265 */
1266 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1267 WARN_ON(idev->mc_qrv == 0);
1268
1269 if (mlh2->mld2q_qrv > 0)
1270 idev->mc_qrv = mlh2->mld2q_qrv;
1271
1272 if (unlikely(idev->mc_qrv < min_qrv)) {
1273 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1274 idev->mc_qrv, min_qrv);
1275 idev->mc_qrv = min_qrv;
1276 }
1277}
1278
1279static void mld_update_qi(struct inet6_dev *idev,
1280 const struct mld2_query *mlh2)
1281{
1282 /* RFC3810, relevant sections:
1283 * - 5.1.9. QQIC (Querier's Query Interval Code)
1284 * - 9.2. Query Interval
1285 * - 9.12. Older Version Querier Present Timeout
1286 * (the [Query Interval] in the last Query received)
1287 */
1288 unsigned long mc_qqi;
1289
1290 if (mlh2->mld2q_qqic < 128) {
1291 mc_qqi = mlh2->mld2q_qqic;
1292 } else {
1293 unsigned long mc_man, mc_exp;
1294
1295 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1296 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1297
1298 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1299 }
1300
1301 idev->mc_qi = mc_qqi * HZ;
1302}
1303
1304static void mld_update_qri(struct inet6_dev *idev,
1305 const struct mld2_query *mlh2)
1306{
1307 /* RFC3810, relevant sections:
1308 * - 5.1.3. Maximum Response Code
1309 * - 9.3. Query Response Interval
1310 */
1311 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1312}
1313
1314static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1315 unsigned long *max_delay, bool v1_query)
1316{
1317 unsigned long mldv1_md;
1318
1319 /* Ignore v1 queries */
1320 if (mld_in_v2_mode_only(idev))
1321 return -EINVAL;
1322
1323 mldv1_md = ntohs(mld->mld_maxdelay);
1324
1325 /* When in MLDv1 fallback and a MLDv2 router start-up being
1326 * unaware of current MLDv1 operation, the MRC == MRD mapping
1327 * only works when the exponential algorithm is not being
1328 * used (as MLDv1 is unaware of such things).
1329 *
1330 * According to the RFC author, the MLDv2 implementations
1331 * he's aware of all use a MRC < 32768 on start up queries.
1332 *
1333 * Thus, should we *ever* encounter something else larger
1334 * than that, just assume the maximum possible within our
1335 * reach.
1336 */
1337 if (!v1_query)
1338 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1339
1340 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1341
1342 /* MLDv1 router present: we need to go into v1 mode *only*
1343 * when an MLDv1 query is received as per section 9.12. of
1344 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1345 * queries MUST be of exactly 24 octets.
1346 */
1347 if (v1_query)
1348 mld_set_v1_mode(idev);
1349
1350 /* cancel MLDv2 report work */
1351 mld_gq_stop_work(idev);
1352 /* cancel the interface change work */
1353 mld_ifc_stop_work(idev);
1354 /* clear deleted report items */
1355 mld_clear_delrec(idev);
1356
1357 return 0;
1358}
1359
1360static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1361 unsigned long *max_delay)
1362{
1363 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1364
1365 mld_update_qrv(idev, mld);
1366 mld_update_qi(idev, mld);
1367 mld_update_qri(idev, mld);
1368
1369 idev->mc_maxdelay = *max_delay;
1370
1371 return;
1372}
1373
1374/* called with rcu_read_lock() */
1375void igmp6_event_query(struct sk_buff *skb)
1376{
1377 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1378
1379 if (!idev || idev->dead)
1380 goto out;
1381
1382 spin_lock_bh(&idev->mc_query_lock);
1383 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) {
1384 __skb_queue_tail(&idev->mc_query_queue, skb);
1385 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0))
1386 in6_dev_hold(idev);
1387 skb = NULL;
1388 }
1389 spin_unlock_bh(&idev->mc_query_lock);
1390out:
1391 kfree_skb(skb);
1392}
1393
1394static void __mld_query_work(struct sk_buff *skb)
1395{
1396 struct mld2_query *mlh2 = NULL;
1397 const struct in6_addr *group;
1398 unsigned long max_delay;
1399 struct inet6_dev *idev;
1400 struct ifmcaddr6 *ma;
1401 struct mld_msg *mld;
1402 int group_type;
1403 int mark = 0;
1404 int len, err;
1405
1406 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1407 goto kfree_skb;
1408
1409 /* compute payload length excluding extension headers */
1410 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1411 len -= skb_network_header_len(skb);
1412
1413 /* RFC3810 6.2
1414 * Upon reception of an MLD message that contains a Query, the node
1415 * checks if the source address of the message is a valid link-local
1416 * address, if the Hop Limit is set to 1, and if the Router Alert
1417 * option is present in the Hop-By-Hop Options header of the IPv6
1418 * packet. If any of these checks fails, the packet is dropped.
1419 */
1420 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1421 ipv6_hdr(skb)->hop_limit != 1 ||
1422 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1423 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1424 goto kfree_skb;
1425
1426 idev = in6_dev_get(skb->dev);
1427 if (!idev)
1428 goto kfree_skb;
1429
1430 mld = (struct mld_msg *)icmp6_hdr(skb);
1431 group = &mld->mld_mca;
1432 group_type = ipv6_addr_type(group);
1433
1434 if (group_type != IPV6_ADDR_ANY &&
1435 !(group_type&IPV6_ADDR_MULTICAST))
1436 goto out;
1437
1438 if (len < MLD_V1_QUERY_LEN) {
1439 goto out;
1440 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1441 err = mld_process_v1(idev, mld, &max_delay,
1442 len == MLD_V1_QUERY_LEN);
1443 if (err < 0)
1444 goto out;
1445 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1446 int srcs_offset = sizeof(struct mld2_query) -
1447 sizeof(struct icmp6hdr);
1448
1449 if (!pskb_may_pull(skb, srcs_offset))
1450 goto out;
1451
1452 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1453
1454 mld_process_v2(idev, mlh2, &max_delay);
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 break;
1527 }
1528 }
1529 spin_unlock_bh(&idev->mc_query_lock);
1530
1531 mutex_lock(&idev->mc_lock);
1532 while ((skb = __skb_dequeue(&q)))
1533 __mld_query_work(skb);
1534 mutex_unlock(&idev->mc_lock);
1535
1536 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0))
1537 return;
1538
1539 in6_dev_put(idev);
1540}
1541
1542/* called with rcu_read_lock() */
1543void igmp6_event_report(struct sk_buff *skb)
1544{
1545 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1546
1547 if (!idev || idev->dead)
1548 goto out;
1549
1550 spin_lock_bh(&idev->mc_report_lock);
1551 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) {
1552 __skb_queue_tail(&idev->mc_report_queue, skb);
1553 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0))
1554 in6_dev_hold(idev);
1555 skb = NULL;
1556 }
1557 spin_unlock_bh(&idev->mc_report_lock);
1558out:
1559 kfree_skb(skb);
1560}
1561
1562static void __mld_report_work(struct sk_buff *skb)
1563{
1564 struct inet6_dev *idev;
1565 struct ifmcaddr6 *ma;
1566 struct mld_msg *mld;
1567 int addr_type;
1568
1569 /* Our own report looped back. Ignore it. */
1570 if (skb->pkt_type == PACKET_LOOPBACK)
1571 goto kfree_skb;
1572
1573 /* send our report if the MC router may not have heard this report */
1574 if (skb->pkt_type != PACKET_MULTICAST &&
1575 skb->pkt_type != PACKET_BROADCAST)
1576 goto kfree_skb;
1577
1578 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1579 goto kfree_skb;
1580
1581 mld = (struct mld_msg *)icmp6_hdr(skb);
1582
1583 /* Drop reports with not link local source */
1584 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1585 if (addr_type != IPV6_ADDR_ANY &&
1586 !(addr_type&IPV6_ADDR_LINKLOCAL))
1587 goto kfree_skb;
1588
1589 idev = in6_dev_get(skb->dev);
1590 if (!idev)
1591 goto kfree_skb;
1592
1593 /*
1594 * Cancel the work for this group
1595 */
1596
1597 for_each_mc_mclock(idev, ma) {
1598 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1599 if (cancel_delayed_work(&ma->mca_work))
1600 refcount_dec(&ma->mca_refcnt);
1601 ma->mca_flags &= ~(MAF_LAST_REPORTER |
1602 MAF_TIMER_RUNNING);
1603 break;
1604 }
1605 }
1606
1607 in6_dev_put(idev);
1608kfree_skb:
1609 consume_skb(skb);
1610}
1611
1612static void mld_report_work(struct work_struct *work)
1613{
1614 struct inet6_dev *idev = container_of(to_delayed_work(work),
1615 struct inet6_dev,
1616 mc_report_work);
1617 struct sk_buff_head q;
1618 struct sk_buff *skb;
1619 bool rework = false;
1620 int cnt = 0;
1621
1622 skb_queue_head_init(&q);
1623 spin_lock_bh(&idev->mc_report_lock);
1624 while ((skb = __skb_dequeue(&idev->mc_report_queue))) {
1625 __skb_queue_tail(&q, skb);
1626
1627 if (++cnt >= MLD_MAX_QUEUE) {
1628 rework = true;
1629 break;
1630 }
1631 }
1632 spin_unlock_bh(&idev->mc_report_lock);
1633
1634 mutex_lock(&idev->mc_lock);
1635 while ((skb = __skb_dequeue(&q)))
1636 __mld_report_work(skb);
1637 mutex_unlock(&idev->mc_lock);
1638
1639 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0))
1640 return;
1641
1642 in6_dev_put(idev);
1643}
1644
1645static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1646 int gdeleted, int sdeleted)
1647{
1648 switch (type) {
1649 case MLD2_MODE_IS_INCLUDE:
1650 case MLD2_MODE_IS_EXCLUDE:
1651 if (gdeleted || sdeleted)
1652 return false;
1653 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1654 if (pmc->mca_sfmode == MCAST_INCLUDE)
1655 return true;
1656 /* don't include if this source is excluded
1657 * in all filters
1658 */
1659 if (psf->sf_count[MCAST_INCLUDE])
1660 return type == MLD2_MODE_IS_INCLUDE;
1661 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1662 psf->sf_count[MCAST_EXCLUDE];
1663 }
1664 return false;
1665 case MLD2_CHANGE_TO_INCLUDE:
1666 if (gdeleted || sdeleted)
1667 return false;
1668 return psf->sf_count[MCAST_INCLUDE] != 0;
1669 case MLD2_CHANGE_TO_EXCLUDE:
1670 if (gdeleted || sdeleted)
1671 return false;
1672 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1673 psf->sf_count[MCAST_INCLUDE])
1674 return false;
1675 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1676 psf->sf_count[MCAST_EXCLUDE];
1677 case MLD2_ALLOW_NEW_SOURCES:
1678 if (gdeleted || !psf->sf_crcount)
1679 return false;
1680 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1681 case MLD2_BLOCK_OLD_SOURCES:
1682 if (pmc->mca_sfmode == MCAST_INCLUDE)
1683 return gdeleted || (psf->sf_crcount && sdeleted);
1684 return psf->sf_crcount && !gdeleted && !sdeleted;
1685 }
1686 return false;
1687}
1688
1689static int
1690mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1691{
1692 struct ip6_sf_list *psf;
1693 int scount = 0;
1694
1695 for_each_psf_mclock(pmc, psf) {
1696 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1697 continue;
1698 scount++;
1699 }
1700 return scount;
1701}
1702
1703static void ip6_mc_hdr(const struct sock *sk, struct sk_buff *skb,
1704 struct net_device *dev, const struct in6_addr *saddr,
1705 const struct in6_addr *daddr, int proto, int len)
1706{
1707 struct ipv6hdr *hdr;
1708
1709 skb->protocol = htons(ETH_P_IPV6);
1710 skb->dev = dev;
1711
1712 skb_reset_network_header(skb);
1713 skb_put(skb, sizeof(struct ipv6hdr));
1714 hdr = ipv6_hdr(skb);
1715
1716 ip6_flow_hdr(hdr, 0, 0);
1717
1718 hdr->payload_len = htons(len);
1719 hdr->nexthdr = proto;
1720 hdr->hop_limit = READ_ONCE(inet6_sk(sk)->hop_limit);
1721
1722 hdr->saddr = *saddr;
1723 hdr->daddr = *daddr;
1724}
1725
1726static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1727{
1728 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1729 2, 0, 0, IPV6_TLV_PADN, 0 };
1730 struct net_device *dev = idev->dev;
1731 int hlen = LL_RESERVED_SPACE(dev);
1732 int tlen = dev->needed_tailroom;
1733 const struct in6_addr *saddr;
1734 struct in6_addr addr_buf;
1735 struct mld2_report *pmr;
1736 struct sk_buff *skb;
1737 unsigned int size;
1738 struct sock *sk;
1739 struct net *net;
1740
1741 /* we assume size > sizeof(ra) here
1742 * Also try to not allocate high-order pages for big MTU
1743 */
1744 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
1745 skb = alloc_skb(size, GFP_KERNEL);
1746 if (!skb)
1747 return NULL;
1748
1749 skb->priority = TC_PRIO_CONTROL;
1750 skb_reserve(skb, hlen);
1751 skb_tailroom_reserve(skb, mtu, tlen);
1752
1753 rcu_read_lock();
1754
1755 net = dev_net_rcu(dev);
1756 sk = net->ipv6.igmp_sk;
1757 skb_set_owner_w(skb, sk);
1758
1759 if (ipv6_get_lladdr(dev, &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 rcu_read_unlock();
1771
1772 skb_put_data(skb, ra, sizeof(ra));
1773
1774 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1775 skb_put(skb, sizeof(*pmr));
1776 pmr = (struct mld2_report *)skb_transport_header(skb);
1777 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1778 pmr->mld2r_resv1 = 0;
1779 pmr->mld2r_cksum = 0;
1780 pmr->mld2r_resv2 = 0;
1781 pmr->mld2r_ngrec = 0;
1782 return skb;
1783}
1784
1785static void mld_sendpack(struct sk_buff *skb)
1786{
1787 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1788 struct mld2_report *pmr =
1789 (struct mld2_report *)skb_transport_header(skb);
1790 int payload_len, mldlen;
1791 struct inet6_dev *idev;
1792 struct net *net = dev_net(skb->dev);
1793 int err;
1794 struct flowi6 fl6;
1795 struct dst_entry *dst;
1796
1797 rcu_read_lock();
1798 idev = __in6_dev_get(skb->dev);
1799 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
1800
1801 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1802 sizeof(*pip6);
1803 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1804 pip6->payload_len = htons(payload_len);
1805
1806 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1807 IPPROTO_ICMPV6,
1808 csum_partial(skb_transport_header(skb),
1809 mldlen, 0));
1810
1811 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1812 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1813 skb->dev->ifindex);
1814 dst = icmp6_dst_alloc(skb->dev, &fl6);
1815
1816 err = 0;
1817 if (IS_ERR(dst)) {
1818 err = PTR_ERR(dst);
1819 dst = NULL;
1820 }
1821 skb_dst_set(skb, dst);
1822 if (err)
1823 goto err_out;
1824
1825 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1826 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1827 dst_output);
1828out:
1829 if (!err) {
1830 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1831 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1832 } else {
1833 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1834 }
1835
1836 rcu_read_unlock();
1837 return;
1838
1839err_out:
1840 kfree_skb(skb);
1841 goto out;
1842}
1843
1844static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1845{
1846 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1847}
1848
1849static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1850 int type, struct mld2_grec **ppgr, unsigned int mtu)
1851{
1852 struct mld2_report *pmr;
1853 struct mld2_grec *pgr;
1854
1855 if (!skb) {
1856 skb = mld_newpack(pmc->idev, mtu);
1857 if (!skb)
1858 return NULL;
1859 }
1860 pgr = skb_put(skb, sizeof(struct mld2_grec));
1861 pgr->grec_type = type;
1862 pgr->grec_auxwords = 0;
1863 pgr->grec_nsrcs = 0;
1864 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1865 pmr = (struct mld2_report *)skb_transport_header(skb);
1866 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1867 *ppgr = pgr;
1868 return skb;
1869}
1870
1871#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1872
1873/* called with mc_lock */
1874static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1875 int type, int gdeleted, int sdeleted,
1876 int crsend)
1877{
1878 struct ip6_sf_list *psf, *psf_prev, *psf_next;
1879 int scount, stotal, first, isquery, truncate;
1880 struct ip6_sf_list __rcu **psf_list;
1881 struct inet6_dev *idev = pmc->idev;
1882 struct net_device *dev = idev->dev;
1883 struct mld2_grec *pgr = NULL;
1884 struct mld2_report *pmr;
1885 unsigned int mtu;
1886
1887 if (pmc->mca_flags & MAF_NOREPORT)
1888 return skb;
1889
1890 mtu = READ_ONCE(dev->mtu);
1891 if (mtu < IPV6_MIN_MTU)
1892 return skb;
1893
1894 isquery = type == MLD2_MODE_IS_INCLUDE ||
1895 type == MLD2_MODE_IS_EXCLUDE;
1896 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1897 type == MLD2_CHANGE_TO_EXCLUDE;
1898
1899 stotal = scount = 0;
1900
1901 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1902
1903 if (!rcu_access_pointer(*psf_list))
1904 goto empty_source;
1905
1906 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1907
1908 /* EX and TO_EX get a fresh packet, if needed */
1909 if (truncate) {
1910 if (pmr && pmr->mld2r_ngrec &&
1911 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1912 if (skb)
1913 mld_sendpack(skb);
1914 skb = mld_newpack(idev, mtu);
1915 }
1916 }
1917 first = 1;
1918 psf_prev = NULL;
1919 for (psf = mc_dereference(*psf_list, idev);
1920 psf;
1921 psf = psf_next) {
1922 struct in6_addr *psrc;
1923
1924 psf_next = mc_dereference(psf->sf_next, idev);
1925
1926 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1927 psf_prev = psf;
1928 continue;
1929 }
1930
1931 /* Based on RFC3810 6.1. Should not send source-list change
1932 * records when there is a filter mode change.
1933 */
1934 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1935 (!gdeleted && pmc->mca_crcount)) &&
1936 (type == MLD2_ALLOW_NEW_SOURCES ||
1937 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1938 goto decrease_sf_crcount;
1939
1940 /* clear marks on query responses */
1941 if (isquery)
1942 psf->sf_gsresp = 0;
1943
1944 if (AVAILABLE(skb) < sizeof(*psrc) +
1945 first*sizeof(struct mld2_grec)) {
1946 if (truncate && !first)
1947 break; /* truncate these */
1948 if (pgr)
1949 pgr->grec_nsrcs = htons(scount);
1950 if (skb)
1951 mld_sendpack(skb);
1952 skb = mld_newpack(idev, mtu);
1953 first = 1;
1954 scount = 0;
1955 }
1956 if (first) {
1957 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1958 first = 0;
1959 }
1960 if (!skb)
1961 return NULL;
1962 psrc = skb_put(skb, sizeof(*psrc));
1963 *psrc = psf->sf_addr;
1964 scount++; stotal++;
1965 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1966 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1967decrease_sf_crcount:
1968 psf->sf_crcount--;
1969 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1970 if (psf_prev)
1971 rcu_assign_pointer(psf_prev->sf_next,
1972 mc_dereference(psf->sf_next, idev));
1973 else
1974 rcu_assign_pointer(*psf_list,
1975 mc_dereference(psf->sf_next, idev));
1976 kfree_rcu(psf, rcu);
1977 continue;
1978 }
1979 }
1980 psf_prev = psf;
1981 }
1982
1983empty_source:
1984 if (!stotal) {
1985 if (type == MLD2_ALLOW_NEW_SOURCES ||
1986 type == MLD2_BLOCK_OLD_SOURCES)
1987 return skb;
1988 if (pmc->mca_crcount || isquery || crsend) {
1989 /* make sure we have room for group header */
1990 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1991 mld_sendpack(skb);
1992 skb = NULL; /* add_grhead will get a new one */
1993 }
1994 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1995 }
1996 }
1997 if (pgr)
1998 pgr->grec_nsrcs = htons(scount);
1999
2000 if (isquery)
2001 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
2002 return skb;
2003}
2004
2005/* called with mc_lock */
2006static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2007{
2008 struct sk_buff *skb = NULL;
2009 int type;
2010
2011 if (!pmc) {
2012 for_each_mc_mclock(idev, pmc) {
2013 if (pmc->mca_flags & MAF_NOREPORT)
2014 continue;
2015 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2016 type = MLD2_MODE_IS_EXCLUDE;
2017 else
2018 type = MLD2_MODE_IS_INCLUDE;
2019 skb = add_grec(skb, pmc, type, 0, 0, 0);
2020 }
2021 } else {
2022 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2023 type = MLD2_MODE_IS_EXCLUDE;
2024 else
2025 type = MLD2_MODE_IS_INCLUDE;
2026 skb = add_grec(skb, pmc, type, 0, 0, 0);
2027 }
2028 if (skb)
2029 mld_sendpack(skb);
2030}
2031
2032/*
2033 * remove zero-count source records from a source filter list
2034 * called with mc_lock
2035 */
2036static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
2037{
2038 struct ip6_sf_list *psf_prev, *psf_next, *psf;
2039
2040 psf_prev = NULL;
2041 for (psf = mc_dereference(*ppsf, idev);
2042 psf;
2043 psf = psf_next) {
2044 psf_next = mc_dereference(psf->sf_next, idev);
2045 if (psf->sf_crcount == 0) {
2046 if (psf_prev)
2047 rcu_assign_pointer(psf_prev->sf_next,
2048 mc_dereference(psf->sf_next, idev));
2049 else
2050 rcu_assign_pointer(*ppsf,
2051 mc_dereference(psf->sf_next, idev));
2052 kfree_rcu(psf, rcu);
2053 } else {
2054 psf_prev = psf;
2055 }
2056 }
2057}
2058
2059/* called with mc_lock */
2060static void mld_send_cr(struct inet6_dev *idev)
2061{
2062 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2063 struct sk_buff *skb = NULL;
2064 int type, dtype;
2065
2066 /* deleted MCA's */
2067 pmc_prev = NULL;
2068 for (pmc = mc_dereference(idev->mc_tomb, idev);
2069 pmc;
2070 pmc = pmc_next) {
2071 pmc_next = mc_dereference(pmc->next, idev);
2072 if (pmc->mca_sfmode == MCAST_INCLUDE) {
2073 type = MLD2_BLOCK_OLD_SOURCES;
2074 dtype = MLD2_BLOCK_OLD_SOURCES;
2075 skb = add_grec(skb, pmc, type, 1, 0, 0);
2076 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
2077 }
2078 if (pmc->mca_crcount) {
2079 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2080 type = MLD2_CHANGE_TO_INCLUDE;
2081 skb = add_grec(skb, pmc, type, 1, 0, 0);
2082 }
2083 pmc->mca_crcount--;
2084 if (pmc->mca_crcount == 0) {
2085 mld_clear_zeros(&pmc->mca_tomb, idev);
2086 mld_clear_zeros(&pmc->mca_sources, idev);
2087 }
2088 }
2089 if (pmc->mca_crcount == 0 &&
2090 !rcu_access_pointer(pmc->mca_tomb) &&
2091 !rcu_access_pointer(pmc->mca_sources)) {
2092 if (pmc_prev)
2093 rcu_assign_pointer(pmc_prev->next, pmc_next);
2094 else
2095 rcu_assign_pointer(idev->mc_tomb, pmc_next);
2096 in6_dev_put(pmc->idev);
2097 kfree_rcu(pmc, rcu);
2098 } else
2099 pmc_prev = pmc;
2100 }
2101
2102 /* change recs */
2103 for_each_mc_mclock(idev, pmc) {
2104 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2105 type = MLD2_BLOCK_OLD_SOURCES;
2106 dtype = MLD2_ALLOW_NEW_SOURCES;
2107 } else {
2108 type = MLD2_ALLOW_NEW_SOURCES;
2109 dtype = MLD2_BLOCK_OLD_SOURCES;
2110 }
2111 skb = add_grec(skb, pmc, type, 0, 0, 0);
2112 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
2113
2114 /* filter mode changes */
2115 if (pmc->mca_crcount) {
2116 if (pmc->mca_sfmode == MCAST_EXCLUDE)
2117 type = MLD2_CHANGE_TO_EXCLUDE;
2118 else
2119 type = MLD2_CHANGE_TO_INCLUDE;
2120 skb = add_grec(skb, pmc, type, 0, 0, 0);
2121 pmc->mca_crcount--;
2122 }
2123 }
2124 if (!skb)
2125 return;
2126 (void) mld_sendpack(skb);
2127}
2128
2129static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2130{
2131 const struct in6_addr *snd_addr, *saddr;
2132 int err, len, payload_len, full_len;
2133 struct in6_addr addr_buf;
2134 struct inet6_dev *idev;
2135 struct sk_buff *skb;
2136 struct mld_msg *hdr;
2137 int hlen = LL_RESERVED_SPACE(dev);
2138 int tlen = dev->needed_tailroom;
2139 u8 ra[8] = { IPPROTO_ICMPV6, 0,
2140 IPV6_TLV_ROUTERALERT, 2, 0, 0,
2141 IPV6_TLV_PADN, 0 };
2142 struct dst_entry *dst;
2143 struct flowi6 fl6;
2144 struct net *net;
2145 struct sock *sk;
2146
2147 if (type == ICMPV6_MGM_REDUCTION)
2148 snd_addr = &in6addr_linklocal_allrouters;
2149 else
2150 snd_addr = addr;
2151
2152 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2153 payload_len = len + sizeof(ra);
2154 full_len = sizeof(struct ipv6hdr) + payload_len;
2155
2156 skb = alloc_skb(hlen + tlen + full_len, GFP_KERNEL);
2157
2158 rcu_read_lock();
2159
2160 net = dev_net_rcu(dev);
2161 idev = __in6_dev_get(dev);
2162 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
2163 if (!skb) {
2164 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2165 rcu_read_unlock();
2166 return;
2167 }
2168 sk = net->ipv6.igmp_sk;
2169 skb_set_owner_w(skb, sk);
2170
2171 skb->priority = TC_PRIO_CONTROL;
2172 skb_reserve(skb, hlen);
2173
2174 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2175 /* <draft-ietf-magma-mld-source-05.txt>:
2176 * use unspecified address as the source address
2177 * when a valid link-local address is not available.
2178 */
2179 saddr = &in6addr_any;
2180 } else
2181 saddr = &addr_buf;
2182
2183 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2184
2185 skb_put_data(skb, ra, sizeof(ra));
2186
2187 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2188 hdr->mld_type = type;
2189 hdr->mld_mca = *addr;
2190
2191 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2192 IPPROTO_ICMPV6,
2193 csum_partial(hdr, len, 0));
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 = get_random_u32_below(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(struct_size(psl, sl_addr, psl->sl_max),
2611 &sk->sk_omem_alloc);
2612 kfree_rcu(psl, rcu);
2613 }
2614
2615 if (idev)
2616 mutex_unlock(&idev->mc_lock);
2617
2618 return err;
2619}
2620
2621/* called with mc_lock */
2622static void igmp6_leave_group(struct ifmcaddr6 *ma)
2623{
2624 if (mld_in_v1_mode(ma->idev)) {
2625 if (ma->mca_flags & MAF_LAST_REPORTER) {
2626 igmp6_send(&ma->mca_addr, ma->idev->dev,
2627 ICMPV6_MGM_REDUCTION);
2628 }
2629 } else {
2630 mld_add_delrec(ma->idev, ma);
2631 mld_ifc_event(ma->idev);
2632 }
2633}
2634
2635static void mld_gq_work(struct work_struct *work)
2636{
2637 struct inet6_dev *idev = container_of(to_delayed_work(work),
2638 struct inet6_dev,
2639 mc_gq_work);
2640
2641 mutex_lock(&idev->mc_lock);
2642 mld_send_report(idev, NULL);
2643 idev->mc_gq_running = 0;
2644 mutex_unlock(&idev->mc_lock);
2645
2646 in6_dev_put(idev);
2647}
2648
2649static void mld_ifc_work(struct work_struct *work)
2650{
2651 struct inet6_dev *idev = container_of(to_delayed_work(work),
2652 struct inet6_dev,
2653 mc_ifc_work);
2654
2655 mutex_lock(&idev->mc_lock);
2656 mld_send_cr(idev);
2657
2658 if (idev->mc_ifc_count) {
2659 idev->mc_ifc_count--;
2660 if (idev->mc_ifc_count)
2661 mld_ifc_start_work(idev,
2662 unsolicited_report_interval(idev));
2663 }
2664 mutex_unlock(&idev->mc_lock);
2665 in6_dev_put(idev);
2666}
2667
2668/* called with mc_lock */
2669static void mld_ifc_event(struct inet6_dev *idev)
2670{
2671 if (mld_in_v1_mode(idev))
2672 return;
2673
2674 idev->mc_ifc_count = idev->mc_qrv;
2675 mld_ifc_start_work(idev, 1);
2676}
2677
2678static void mld_mca_work(struct work_struct *work)
2679{
2680 struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2681 struct ifmcaddr6, mca_work);
2682
2683 mutex_lock(&ma->idev->mc_lock);
2684 if (mld_in_v1_mode(ma->idev))
2685 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2686 else
2687 mld_send_report(ma->idev, ma);
2688 ma->mca_flags |= MAF_LAST_REPORTER;
2689 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2690 mutex_unlock(&ma->idev->mc_lock);
2691
2692 ma_put(ma);
2693}
2694
2695/* Device changing type */
2696
2697void ipv6_mc_unmap(struct inet6_dev *idev)
2698{
2699 struct ifmcaddr6 *i;
2700
2701 /* Install multicast list, except for all-nodes (already installed) */
2702
2703 mutex_lock(&idev->mc_lock);
2704 for_each_mc_mclock(idev, i)
2705 igmp6_group_dropped(i);
2706 mutex_unlock(&idev->mc_lock);
2707}
2708
2709void ipv6_mc_remap(struct inet6_dev *idev)
2710{
2711 ipv6_mc_up(idev);
2712}
2713
2714/* Device going down */
2715void ipv6_mc_down(struct inet6_dev *idev)
2716{
2717 struct ifmcaddr6 *i;
2718
2719 mutex_lock(&idev->mc_lock);
2720 /* Withdraw multicast list */
2721 for_each_mc_mclock(idev, i)
2722 igmp6_group_dropped(i);
2723 mutex_unlock(&idev->mc_lock);
2724
2725 /* Should stop work after group drop. or we will
2726 * start work again in mld_ifc_event()
2727 */
2728 mld_query_stop_work(idev);
2729 mld_report_stop_work(idev);
2730
2731 mutex_lock(&idev->mc_lock);
2732 mld_ifc_stop_work(idev);
2733 mld_gq_stop_work(idev);
2734 mutex_unlock(&idev->mc_lock);
2735
2736 mld_dad_stop_work(idev);
2737}
2738
2739static void ipv6_mc_reset(struct inet6_dev *idev)
2740{
2741 idev->mc_qrv = sysctl_mld_qrv;
2742 idev->mc_qi = MLD_QI_DEFAULT;
2743 idev->mc_qri = MLD_QRI_DEFAULT;
2744 idev->mc_v1_seen = 0;
2745 idev->mc_maxdelay = unsolicited_report_interval(idev);
2746}
2747
2748/* Device going up */
2749
2750void ipv6_mc_up(struct inet6_dev *idev)
2751{
2752 struct ifmcaddr6 *i;
2753
2754 /* Install multicast list, except for all-nodes (already installed) */
2755
2756 ipv6_mc_reset(idev);
2757 mutex_lock(&idev->mc_lock);
2758 for_each_mc_mclock(idev, i) {
2759 mld_del_delrec(idev, i);
2760 igmp6_group_added(i);
2761 }
2762 mutex_unlock(&idev->mc_lock);
2763}
2764
2765/* IPv6 device initialization. */
2766
2767void ipv6_mc_init_dev(struct inet6_dev *idev)
2768{
2769 idev->mc_gq_running = 0;
2770 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work);
2771 RCU_INIT_POINTER(idev->mc_tomb, NULL);
2772 idev->mc_ifc_count = 0;
2773 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work);
2774 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work);
2775 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work);
2776 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work);
2777 skb_queue_head_init(&idev->mc_query_queue);
2778 skb_queue_head_init(&idev->mc_report_queue);
2779 spin_lock_init(&idev->mc_query_lock);
2780 spin_lock_init(&idev->mc_report_lock);
2781 mutex_init(&idev->mc_lock);
2782 ipv6_mc_reset(idev);
2783}
2784
2785/*
2786 * Device is about to be destroyed: clean up.
2787 */
2788
2789void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2790{
2791 struct ifmcaddr6 *i;
2792
2793 /* Deactivate works */
2794 ipv6_mc_down(idev);
2795 mutex_lock(&idev->mc_lock);
2796 mld_clear_delrec(idev);
2797 mutex_unlock(&idev->mc_lock);
2798 mld_clear_query(idev);
2799 mld_clear_report(idev);
2800
2801 /* Delete all-nodes address. */
2802 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2803 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2804 * fail.
2805 */
2806 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2807
2808 if (idev->cnf.forwarding)
2809 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2810
2811 mutex_lock(&idev->mc_lock);
2812 while ((i = mc_dereference(idev->mc_list, idev))) {
2813 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev));
2814
2815 ip6_mc_clear_src(i);
2816 ma_put(i);
2817 }
2818 mutex_unlock(&idev->mc_lock);
2819}
2820
2821static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2822{
2823 struct ifmcaddr6 *pmc;
2824
2825 ASSERT_RTNL();
2826
2827 mutex_lock(&idev->mc_lock);
2828 if (mld_in_v1_mode(idev)) {
2829 for_each_mc_mclock(idev, pmc)
2830 igmp6_join_group(pmc);
2831 } else {
2832 mld_send_report(idev, NULL);
2833 }
2834 mutex_unlock(&idev->mc_lock);
2835}
2836
2837static int ipv6_mc_netdev_event(struct notifier_block *this,
2838 unsigned long event,
2839 void *ptr)
2840{
2841 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2842 struct inet6_dev *idev = __in6_dev_get(dev);
2843
2844 switch (event) {
2845 case NETDEV_RESEND_IGMP:
2846 if (idev)
2847 ipv6_mc_rejoin_groups(idev);
2848 break;
2849 default:
2850 break;
2851 }
2852
2853 return NOTIFY_DONE;
2854}
2855
2856static struct notifier_block igmp6_netdev_notifier = {
2857 .notifier_call = ipv6_mc_netdev_event,
2858};
2859
2860#ifdef CONFIG_PROC_FS
2861struct igmp6_mc_iter_state {
2862 struct seq_net_private p;
2863 struct net_device *dev;
2864 struct inet6_dev *idev;
2865};
2866
2867#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2868
2869static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2870{
2871 struct ifmcaddr6 *im = NULL;
2872 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2873 struct net *net = seq_file_net(seq);
2874
2875 state->idev = NULL;
2876 for_each_netdev_rcu(net, state->dev) {
2877 struct inet6_dev *idev;
2878 idev = __in6_dev_get(state->dev);
2879 if (!idev)
2880 continue;
2881
2882 im = rcu_dereference(idev->mc_list);
2883 if (im) {
2884 state->idev = idev;
2885 break;
2886 }
2887 }
2888 return im;
2889}
2890
2891static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2892{
2893 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2894
2895 im = rcu_dereference(im->next);
2896 while (!im) {
2897 state->dev = next_net_device_rcu(state->dev);
2898 if (!state->dev) {
2899 state->idev = NULL;
2900 break;
2901 }
2902 state->idev = __in6_dev_get(state->dev);
2903 if (!state->idev)
2904 continue;
2905 im = rcu_dereference(state->idev->mc_list);
2906 }
2907 return im;
2908}
2909
2910static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2911{
2912 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2913 if (im)
2914 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2915 --pos;
2916 return pos ? NULL : im;
2917}
2918
2919static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2920 __acquires(RCU)
2921{
2922 rcu_read_lock();
2923 return igmp6_mc_get_idx(seq, *pos);
2924}
2925
2926static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2927{
2928 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2929
2930 ++*pos;
2931 return im;
2932}
2933
2934static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2935 __releases(RCU)
2936{
2937 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2938
2939 if (likely(state->idev))
2940 state->idev = NULL;
2941 state->dev = NULL;
2942 rcu_read_unlock();
2943}
2944
2945static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2946{
2947 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2948 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2949
2950 seq_printf(seq,
2951 "%-4d %-15s %pi6 %5d %08X %ld\n",
2952 state->dev->ifindex, state->dev->name,
2953 &im->mca_addr,
2954 im->mca_users, im->mca_flags,
2955 (im->mca_flags & MAF_TIMER_RUNNING) ?
2956 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0);
2957 return 0;
2958}
2959
2960static const struct seq_operations igmp6_mc_seq_ops = {
2961 .start = igmp6_mc_seq_start,
2962 .next = igmp6_mc_seq_next,
2963 .stop = igmp6_mc_seq_stop,
2964 .show = igmp6_mc_seq_show,
2965};
2966
2967struct igmp6_mcf_iter_state {
2968 struct seq_net_private p;
2969 struct net_device *dev;
2970 struct inet6_dev *idev;
2971 struct ifmcaddr6 *im;
2972};
2973
2974#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2975
2976static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2977{
2978 struct ip6_sf_list *psf = NULL;
2979 struct ifmcaddr6 *im = NULL;
2980 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2981 struct net *net = seq_file_net(seq);
2982
2983 state->idev = NULL;
2984 state->im = NULL;
2985 for_each_netdev_rcu(net, state->dev) {
2986 struct inet6_dev *idev;
2987 idev = __in6_dev_get(state->dev);
2988 if (unlikely(idev == NULL))
2989 continue;
2990
2991 im = rcu_dereference(idev->mc_list);
2992 if (likely(im)) {
2993 psf = rcu_dereference(im->mca_sources);
2994 if (likely(psf)) {
2995 state->im = im;
2996 state->idev = idev;
2997 break;
2998 }
2999 }
3000 }
3001 return psf;
3002}
3003
3004static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
3005{
3006 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3007
3008 psf = rcu_dereference(psf->sf_next);
3009 while (!psf) {
3010 state->im = rcu_dereference(state->im->next);
3011 while (!state->im) {
3012 state->dev = next_net_device_rcu(state->dev);
3013 if (!state->dev) {
3014 state->idev = NULL;
3015 goto out;
3016 }
3017 state->idev = __in6_dev_get(state->dev);
3018 if (!state->idev)
3019 continue;
3020 state->im = rcu_dereference(state->idev->mc_list);
3021 }
3022 psf = rcu_dereference(state->im->mca_sources);
3023 }
3024out:
3025 return psf;
3026}
3027
3028static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3029{
3030 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3031 if (psf)
3032 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3033 --pos;
3034 return pos ? NULL : psf;
3035}
3036
3037static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3038 __acquires(RCU)
3039{
3040 rcu_read_lock();
3041 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3042}
3043
3044static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3045{
3046 struct ip6_sf_list *psf;
3047 if (v == SEQ_START_TOKEN)
3048 psf = igmp6_mcf_get_first(seq);
3049 else
3050 psf = igmp6_mcf_get_next(seq, v);
3051 ++*pos;
3052 return psf;
3053}
3054
3055static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
3056 __releases(RCU)
3057{
3058 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3059
3060 if (likely(state->im))
3061 state->im = NULL;
3062 if (likely(state->idev))
3063 state->idev = NULL;
3064
3065 state->dev = NULL;
3066 rcu_read_unlock();
3067}
3068
3069static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3070{
3071 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3072 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3073
3074 if (v == SEQ_START_TOKEN) {
3075 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
3076 } else {
3077 seq_printf(seq,
3078 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
3079 state->dev->ifindex, state->dev->name,
3080 &state->im->mca_addr,
3081 &psf->sf_addr,
3082 psf->sf_count[MCAST_INCLUDE],
3083 psf->sf_count[MCAST_EXCLUDE]);
3084 }
3085 return 0;
3086}
3087
3088static const struct seq_operations igmp6_mcf_seq_ops = {
3089 .start = igmp6_mcf_seq_start,
3090 .next = igmp6_mcf_seq_next,
3091 .stop = igmp6_mcf_seq_stop,
3092 .show = igmp6_mcf_seq_show,
3093};
3094
3095static int __net_init igmp6_proc_init(struct net *net)
3096{
3097 int err;
3098
3099 err = -ENOMEM;
3100 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3101 sizeof(struct igmp6_mc_iter_state)))
3102 goto out;
3103 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3104 &igmp6_mcf_seq_ops,
3105 sizeof(struct igmp6_mcf_iter_state)))
3106 goto out_proc_net_igmp6;
3107
3108 err = 0;
3109out:
3110 return err;
3111
3112out_proc_net_igmp6:
3113 remove_proc_entry("igmp6", net->proc_net);
3114 goto out;
3115}
3116
3117static void __net_exit igmp6_proc_exit(struct net *net)
3118{
3119 remove_proc_entry("mcfilter6", net->proc_net);
3120 remove_proc_entry("igmp6", net->proc_net);
3121}
3122#else
3123static inline int igmp6_proc_init(struct net *net)
3124{
3125 return 0;
3126}
3127static inline void igmp6_proc_exit(struct net *net)
3128{
3129}
3130#endif
3131
3132static int __net_init igmp6_net_init(struct net *net)
3133{
3134 int err;
3135
3136 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3137 SOCK_RAW, IPPROTO_ICMPV6, net);
3138 if (err < 0) {
3139 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
3140 err);
3141 goto out;
3142 }
3143
3144 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
3145 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
3146
3147 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3148 SOCK_RAW, IPPROTO_ICMPV6, net);
3149 if (err < 0) {
3150 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3151 err);
3152 goto out_sock_create;
3153 }
3154
3155 err = igmp6_proc_init(net);
3156 if (err)
3157 goto out_sock_create_autojoin;
3158
3159 return 0;
3160
3161out_sock_create_autojoin:
3162 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3163out_sock_create:
3164 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3165out:
3166 return err;
3167}
3168
3169static void __net_exit igmp6_net_exit(struct net *net)
3170{
3171 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3172 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3173 igmp6_proc_exit(net);
3174}
3175
3176static struct pernet_operations igmp6_net_ops = {
3177 .init = igmp6_net_init,
3178 .exit = igmp6_net_exit,
3179};
3180
3181int __init igmp6_init(void)
3182{
3183 int err;
3184
3185 err = register_pernet_subsys(&igmp6_net_ops);
3186 if (err)
3187 return err;
3188
3189 mld_wq = create_workqueue("mld");
3190 if (!mld_wq) {
3191 unregister_pernet_subsys(&igmp6_net_ops);
3192 return -ENOMEM;
3193 }
3194
3195 return err;
3196}
3197
3198int __init igmp6_late_init(void)
3199{
3200 return register_netdevice_notifier(&igmp6_netdev_notifier);
3201}
3202
3203void igmp6_cleanup(void)
3204{
3205 unregister_pernet_subsys(&igmp6_net_ops);
3206 destroy_workqueue(mld_wq);
3207}
3208
3209void igmp6_late_cleanup(void)
3210{
3211 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3212}