Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Multicast support for IPv6
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 *
9 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
10 */
11
12/* Changes:
13 *
14 * yoshfuji : fix format of router-alert option
15 * YOSHIFUJI Hideaki @USAGI:
16 * Fixed source address for MLD message based on
17 * <draft-ietf-magma-mld-source-05.txt>.
18 * YOSHIFUJI Hideaki @USAGI:
19 * - Ignore Queries for invalid addresses.
20 * - MLD for link-local addresses.
21 * David L Stevens <dlstevens@us.ibm.com>:
22 * - MLDv2 support
23 */
24
25#include <linux/module.h>
26#include <linux/errno.h>
27#include <linux/types.h>
28#include <linux/string.h>
29#include <linux/socket.h>
30#include <linux/sockios.h>
31#include <linux/jiffies.h>
32#include <linux/net.h>
33#include <linux/in.h>
34#include <linux/in6.h>
35#include <linux/netdevice.h>
36#include <linux/if_arp.h>
37#include <linux/route.h>
38#include <linux/init.h>
39#include <linux/proc_fs.h>
40#include <linux/seq_file.h>
41#include <linux/slab.h>
42#include <linux/pkt_sched.h>
43#include <net/mld.h>
44#include <linux/workqueue.h>
45
46#include <linux/netfilter.h>
47#include <linux/netfilter_ipv6.h>
48
49#include <net/net_namespace.h>
50#include <net/sock.h>
51#include <net/snmp.h>
52
53#include <net/ipv6.h>
54#include <net/protocol.h>
55#include <net/if_inet6.h>
56#include <net/ndisc.h>
57#include <net/addrconf.h>
58#include <net/ip6_route.h>
59#include <net/inet_common.h>
60
61#include <net/ip6_checksum.h>
62
63/* Ensure that we have struct in6_addr aligned on 32bit word. */
64static int __mld2_query_bugs[] __attribute__((__unused__)) = {
65 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
66 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
67 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
68};
69
70static struct workqueue_struct *mld_wq;
71static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
72
73static void igmp6_join_group(struct ifmcaddr6 *ma);
74static void igmp6_leave_group(struct ifmcaddr6 *ma);
75static void mld_mca_work(struct work_struct *work);
76
77static void mld_ifc_event(struct inet6_dev *idev);
78static bool mld_in_v1_mode(const struct inet6_dev *idev);
79static int sf_setstate(struct ifmcaddr6 *pmc);
80static void sf_markstate(struct ifmcaddr6 *pmc);
81static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
82static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
83 int sfmode, int sfcount, const struct in6_addr *psfsrc,
84 int delta);
85static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
86 int sfmode, int sfcount, const struct in6_addr *psfsrc,
87 int delta);
88static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
89 struct inet6_dev *idev);
90static int __ipv6_dev_mc_inc(struct net_device *dev,
91 const struct in6_addr *addr, unsigned int mode);
92
93#define MLD_QRV_DEFAULT 2
94/* RFC3810, 9.2. Query Interval */
95#define MLD_QI_DEFAULT (125 * HZ)
96/* RFC3810, 9.3. Query Response Interval */
97#define MLD_QRI_DEFAULT (10 * HZ)
98
99/* RFC3810, 8.1 Query Version Distinctions */
100#define MLD_V1_QUERY_LEN 24
101#define MLD_V2_QUERY_LEN_MIN 28
102
103#define IPV6_MLD_MAX_MSF 64
104
105int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
106int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
107
108/*
109 * socket join on multicast group
110 */
111#define mc_dereference(e, idev) \
112 rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock))
113
114#define sock_dereference(e, sk) \
115 rcu_dereference_protected(e, lockdep_sock_is_held(sk))
116
117#define for_each_pmc_socklock(np, sk, pmc) \
118 for (pmc = sock_dereference((np)->ipv6_mc_list, sk); \
119 pmc; \
120 pmc = sock_dereference(pmc->next, sk))
121
122#define for_each_pmc_rcu(np, pmc) \
123 for (pmc = rcu_dereference((np)->ipv6_mc_list); \
124 pmc; \
125 pmc = rcu_dereference(pmc->next))
126
127#define for_each_psf_mclock(mc, psf) \
128 for (psf = mc_dereference((mc)->mca_sources, mc->idev); \
129 psf; \
130 psf = mc_dereference(psf->sf_next, mc->idev))
131
132#define for_each_psf_rcu(mc, psf) \
133 for (psf = rcu_dereference((mc)->mca_sources); \
134 psf; \
135 psf = rcu_dereference(psf->sf_next))
136
137#define for_each_psf_tomb(mc, psf) \
138 for (psf = mc_dereference((mc)->mca_tomb, mc->idev); \
139 psf; \
140 psf = mc_dereference(psf->sf_next, mc->idev))
141
142#define for_each_mc_mclock(idev, mc) \
143 for (mc = mc_dereference((idev)->mc_list, idev); \
144 mc; \
145 mc = mc_dereference(mc->next, idev))
146
147#define for_each_mc_rcu(idev, mc) \
148 for (mc = rcu_dereference((idev)->mc_list); \
149 mc; \
150 mc = rcu_dereference(mc->next))
151
152#define for_each_mc_tomb(idev, mc) \
153 for (mc = mc_dereference((idev)->mc_tomb, idev); \
154 mc; \
155 mc = mc_dereference(mc->next, idev))
156
157static int unsolicited_report_interval(struct inet6_dev *idev)
158{
159 int iv;
160
161 if (mld_in_v1_mode(idev))
162 iv = idev->cnf.mldv1_unsolicited_report_interval;
163 else
164 iv = idev->cnf.mldv2_unsolicited_report_interval;
165
166 return iv > 0 ? iv : 1;
167}
168
169static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
170 const struct in6_addr *addr, unsigned int mode)
171{
172 struct net_device *dev = NULL;
173 struct ipv6_mc_socklist *mc_lst;
174 struct ipv6_pinfo *np = inet6_sk(sk);
175 struct net *net = sock_net(sk);
176 int err;
177
178 ASSERT_RTNL();
179
180 if (!ipv6_addr_is_multicast(addr))
181 return -EINVAL;
182
183 for_each_pmc_socklock(np, sk, mc_lst) {
184 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
185 ipv6_addr_equal(&mc_lst->addr, addr))
186 return -EADDRINUSE;
187 }
188
189 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
190
191 if (!mc_lst)
192 return -ENOMEM;
193
194 mc_lst->next = NULL;
195 mc_lst->addr = *addr;
196
197 if (ifindex == 0) {
198 struct rt6_info *rt;
199 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
200 if (rt) {
201 dev = rt->dst.dev;
202 ip6_rt_put(rt);
203 }
204 } else
205 dev = __dev_get_by_index(net, ifindex);
206
207 if (!dev) {
208 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
209 return -ENODEV;
210 }
211
212 mc_lst->ifindex = dev->ifindex;
213 mc_lst->sfmode = mode;
214 RCU_INIT_POINTER(mc_lst->sflist, NULL);
215
216 /*
217 * now add/increase the group membership on the device
218 */
219
220 err = __ipv6_dev_mc_inc(dev, addr, mode);
221
222 if (err) {
223 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
224 return err;
225 }
226
227 mc_lst->next = np->ipv6_mc_list;
228 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
229
230 return 0;
231}
232
233int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
234{
235 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
236}
237EXPORT_SYMBOL(ipv6_sock_mc_join);
238
239int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
240 const struct in6_addr *addr, unsigned int mode)
241{
242 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
243}
244
245/*
246 * socket leave on multicast group
247 */
248int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
249{
250 struct ipv6_pinfo *np = inet6_sk(sk);
251 struct ipv6_mc_socklist *mc_lst;
252 struct ipv6_mc_socklist __rcu **lnk;
253 struct net *net = sock_net(sk);
254
255 ASSERT_RTNL();
256
257 if (!ipv6_addr_is_multicast(addr))
258 return -EINVAL;
259
260 for (lnk = &np->ipv6_mc_list;
261 (mc_lst = sock_dereference(*lnk, sk)) != NULL;
262 lnk = &mc_lst->next) {
263 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
264 ipv6_addr_equal(&mc_lst->addr, addr)) {
265 struct net_device *dev;
266
267 *lnk = mc_lst->next;
268
269 dev = __dev_get_by_index(net, mc_lst->ifindex);
270 if (dev) {
271 struct inet6_dev *idev = __in6_dev_get(dev);
272
273 ip6_mc_leave_src(sk, mc_lst, idev);
274 if (idev)
275 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
276 } else {
277 ip6_mc_leave_src(sk, mc_lst, NULL);
278 }
279
280 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
281 kfree_rcu(mc_lst, rcu);
282 return 0;
283 }
284 }
285
286 return -EADDRNOTAVAIL;
287}
288EXPORT_SYMBOL(ipv6_sock_mc_drop);
289
290static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net,
291 const struct in6_addr *group,
292 int ifindex)
293{
294 struct net_device *dev = NULL;
295 struct inet6_dev *idev = NULL;
296
297 if (ifindex == 0) {
298 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
299
300 if (rt) {
301 dev = rt->dst.dev;
302 ip6_rt_put(rt);
303 }
304 } else {
305 dev = __dev_get_by_index(net, ifindex);
306 }
307
308 if (!dev)
309 return NULL;
310 idev = __in6_dev_get(dev);
311 if (!idev)
312 return NULL;
313 if (idev->dead)
314 return NULL;
315 return idev;
316}
317
318void __ipv6_sock_mc_close(struct sock *sk)
319{
320 struct ipv6_pinfo *np = inet6_sk(sk);
321 struct ipv6_mc_socklist *mc_lst;
322 struct net *net = sock_net(sk);
323
324 ASSERT_RTNL();
325
326 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) {
327 struct net_device *dev;
328
329 np->ipv6_mc_list = mc_lst->next;
330
331 dev = __dev_get_by_index(net, mc_lst->ifindex);
332 if (dev) {
333 struct inet6_dev *idev = __in6_dev_get(dev);
334
335 ip6_mc_leave_src(sk, mc_lst, idev);
336 if (idev)
337 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
338 } else {
339 ip6_mc_leave_src(sk, mc_lst, NULL);
340 }
341
342 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
343 kfree_rcu(mc_lst, rcu);
344 }
345}
346
347void ipv6_sock_mc_close(struct sock *sk)
348{
349 struct ipv6_pinfo *np = inet6_sk(sk);
350
351 if (!rcu_access_pointer(np->ipv6_mc_list))
352 return;
353
354 rtnl_lock();
355 lock_sock(sk);
356 __ipv6_sock_mc_close(sk);
357 release_sock(sk);
358 rtnl_unlock();
359}
360
361int ip6_mc_source(int add, int omode, struct sock *sk,
362 struct group_source_req *pgsr)
363{
364 struct in6_addr *source, *group;
365 struct ipv6_mc_socklist *pmc;
366 struct inet6_dev *idev;
367 struct ipv6_pinfo *inet6 = inet6_sk(sk);
368 struct ip6_sf_socklist *psl;
369 struct net *net = sock_net(sk);
370 int i, j, rv;
371 int leavegroup = 0;
372 int err;
373
374 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
375 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
376
377 if (!ipv6_addr_is_multicast(group))
378 return -EINVAL;
379
380 idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface);
381 if (!idev)
382 return -ENODEV;
383
384 err = -EADDRNOTAVAIL;
385
386 mutex_lock(&idev->mc_lock);
387 for_each_pmc_socklock(inet6, sk, pmc) {
388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
389 continue;
390 if (ipv6_addr_equal(&pmc->addr, group))
391 break;
392 }
393 if (!pmc) { /* must have a prior join */
394 err = -EINVAL;
395 goto done;
396 }
397 /* if a source filter was set, must be the same mode as before */
398 if (rcu_access_pointer(pmc->sflist)) {
399 if (pmc->sfmode != omode) {
400 err = -EINVAL;
401 goto done;
402 }
403 } else if (pmc->sfmode != omode) {
404 /* allow mode switches for empty-set filters */
405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
407 pmc->sfmode = omode;
408 }
409
410 psl = sock_dereference(pmc->sflist, sk);
411 if (!add) {
412 if (!psl)
413 goto done; /* err = -EADDRNOTAVAIL */
414 rv = !0;
415 for (i = 0; i < psl->sl_count; i++) {
416 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
417 if (rv == 0)
418 break;
419 }
420 if (rv) /* source not found */
421 goto done; /* err = -EADDRNOTAVAIL */
422
423 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
424 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
425 leavegroup = 1;
426 goto done;
427 }
428
429 /* update the interface filter */
430 ip6_mc_del_src(idev, group, omode, 1, source, 1);
431
432 for (j = i+1; j < psl->sl_count; j++)
433 psl->sl_addr[j-1] = psl->sl_addr[j];
434 psl->sl_count--;
435 err = 0;
436 goto done;
437 }
438 /* else, add a new source to the filter */
439
440 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
441 err = -ENOBUFS;
442 goto done;
443 }
444 if (!psl || psl->sl_count == psl->sl_max) {
445 struct ip6_sf_socklist *newpsl;
446 int count = IP6_SFBLOCK;
447
448 if (psl)
449 count += psl->sl_max;
450 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count),
451 GFP_KERNEL);
452 if (!newpsl) {
453 err = -ENOBUFS;
454 goto done;
455 }
456 newpsl->sl_max = count;
457 newpsl->sl_count = count - IP6_SFBLOCK;
458 if (psl) {
459 for (i = 0; i < psl->sl_count; i++)
460 newpsl->sl_addr[i] = psl->sl_addr[i];
461 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
462 &sk->sk_omem_alloc);
463 }
464 rcu_assign_pointer(pmc->sflist, newpsl);
465 kfree_rcu(psl, rcu);
466 psl = newpsl;
467 }
468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
469 for (i = 0; i < psl->sl_count; i++) {
470 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
471 if (rv == 0) /* There is an error in the address. */
472 goto done;
473 }
474 for (j = psl->sl_count-1; j >= i; j--)
475 psl->sl_addr[j+1] = psl->sl_addr[j];
476 psl->sl_addr[i] = *source;
477 psl->sl_count++;
478 err = 0;
479 /* update the interface list */
480 ip6_mc_add_src(idev, group, omode, 1, source, 1);
481done:
482 mutex_unlock(&idev->mc_lock);
483 if (leavegroup)
484 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
485 return err;
486}
487
488int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
489 struct sockaddr_storage *list)
490{
491 const struct in6_addr *group;
492 struct ipv6_mc_socklist *pmc;
493 struct inet6_dev *idev;
494 struct ipv6_pinfo *inet6 = inet6_sk(sk);
495 struct ip6_sf_socklist *newpsl, *psl;
496 struct net *net = sock_net(sk);
497 int leavegroup = 0;
498 int i, err;
499
500 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
501
502 if (!ipv6_addr_is_multicast(group))
503 return -EINVAL;
504 if (gsf->gf_fmode != MCAST_INCLUDE &&
505 gsf->gf_fmode != MCAST_EXCLUDE)
506 return -EINVAL;
507
508 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface);
509 if (!idev)
510 return -ENODEV;
511
512 err = 0;
513
514 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
515 leavegroup = 1;
516 goto done;
517 }
518
519 for_each_pmc_socklock(inet6, sk, pmc) {
520 if (pmc->ifindex != gsf->gf_interface)
521 continue;
522 if (ipv6_addr_equal(&pmc->addr, group))
523 break;
524 }
525 if (!pmc) { /* must have a prior join */
526 err = -EINVAL;
527 goto done;
528 }
529 if (gsf->gf_numsrc) {
530 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr,
531 gsf->gf_numsrc),
532 GFP_KERNEL);
533 if (!newpsl) {
534 err = -ENOBUFS;
535 goto done;
536 }
537 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
538 for (i = 0; i < newpsl->sl_count; ++i, ++list) {
539 struct sockaddr_in6 *psin6;
540
541 psin6 = (struct sockaddr_in6 *)list;
542 newpsl->sl_addr[i] = psin6->sin6_addr;
543 }
544 mutex_lock(&idev->mc_lock);
545 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
546 newpsl->sl_count, newpsl->sl_addr, 0);
547 if (err) {
548 mutex_unlock(&idev->mc_lock);
549 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr,
550 newpsl->sl_max));
551 goto done;
552 }
553 mutex_unlock(&idev->mc_lock);
554 } else {
555 newpsl = NULL;
556 mutex_lock(&idev->mc_lock);
557 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
558 mutex_unlock(&idev->mc_lock);
559 }
560
561 mutex_lock(&idev->mc_lock);
562 psl = sock_dereference(pmc->sflist, sk);
563 if (psl) {
564 ip6_mc_del_src(idev, group, pmc->sfmode,
565 psl->sl_count, psl->sl_addr, 0);
566 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
567 &sk->sk_omem_alloc);
568 } else {
569 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
570 }
571 rcu_assign_pointer(pmc->sflist, newpsl);
572 mutex_unlock(&idev->mc_lock);
573 kfree_rcu(psl, rcu);
574 pmc->sfmode = gsf->gf_fmode;
575 err = 0;
576done:
577 if (leavegroup)
578 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
579 return err;
580}
581
582int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
583 sockptr_t optval, size_t ss_offset)
584{
585 struct ipv6_pinfo *inet6 = inet6_sk(sk);
586 const struct in6_addr *group;
587 struct ipv6_mc_socklist *pmc;
588 struct ip6_sf_socklist *psl;
589 int i, count, copycount;
590
591 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
592
593 if (!ipv6_addr_is_multicast(group))
594 return -EINVAL;
595
596 /* changes to the ipv6_mc_list require the socket lock and
597 * rtnl lock. We have the socket lock, so reading the list is safe.
598 */
599
600 for_each_pmc_socklock(inet6, sk, pmc) {
601 if (pmc->ifindex != gsf->gf_interface)
602 continue;
603 if (ipv6_addr_equal(group, &pmc->addr))
604 break;
605 }
606 if (!pmc) /* must have a prior join */
607 return -EADDRNOTAVAIL;
608
609 gsf->gf_fmode = pmc->sfmode;
610 psl = sock_dereference(pmc->sflist, sk);
611 count = psl ? psl->sl_count : 0;
612
613 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
614 gsf->gf_numsrc = count;
615 for (i = 0; i < copycount; i++) {
616 struct sockaddr_in6 *psin6;
617 struct sockaddr_storage ss;
618
619 psin6 = (struct sockaddr_in6 *)&ss;
620 memset(&ss, 0, sizeof(ss));
621 psin6->sin6_family = AF_INET6;
622 psin6->sin6_addr = psl->sl_addr[i];
623 if (copy_to_sockptr_offset(optval, ss_offset, &ss, sizeof(ss)))
624 return -EFAULT;
625 ss_offset += sizeof(ss);
626 }
627 return 0;
628}
629
630bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
631 const struct in6_addr *src_addr)
632{
633 struct ipv6_pinfo *np = inet6_sk(sk);
634 struct ipv6_mc_socklist *mc;
635 struct ip6_sf_socklist *psl;
636 bool rv = true;
637
638 rcu_read_lock();
639 for_each_pmc_rcu(np, mc) {
640 if (ipv6_addr_equal(&mc->addr, mc_addr))
641 break;
642 }
643 if (!mc) {
644 rcu_read_unlock();
645 return np->mc_all;
646 }
647 psl = rcu_dereference(mc->sflist);
648 if (!psl) {
649 rv = mc->sfmode == MCAST_EXCLUDE;
650 } else {
651 int i;
652
653 for (i = 0; i < psl->sl_count; i++) {
654 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
655 break;
656 }
657 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
658 rv = false;
659 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
660 rv = false;
661 }
662 rcu_read_unlock();
663
664 return rv;
665}
666
667/* called with mc_lock */
668static void igmp6_group_added(struct ifmcaddr6 *mc)
669{
670 struct net_device *dev = mc->idev->dev;
671 char buf[MAX_ADDR_LEN];
672
673 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
674 IPV6_ADDR_SCOPE_LINKLOCAL)
675 return;
676
677 if (!(mc->mca_flags&MAF_LOADED)) {
678 mc->mca_flags |= MAF_LOADED;
679 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
680 dev_mc_add(dev, buf);
681 }
682
683 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
684 return;
685
686 if (mld_in_v1_mode(mc->idev)) {
687 igmp6_join_group(mc);
688 return;
689 }
690 /* else v2 */
691
692 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
693 * should not send filter-mode change record as the mode
694 * should be from IN() to IN(A).
695 */
696 if (mc->mca_sfmode == MCAST_EXCLUDE)
697 mc->mca_crcount = mc->idev->mc_qrv;
698
699 mld_ifc_event(mc->idev);
700}
701
702/* called with mc_lock */
703static void igmp6_group_dropped(struct ifmcaddr6 *mc)
704{
705 struct net_device *dev = mc->idev->dev;
706 char buf[MAX_ADDR_LEN];
707
708 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
709 IPV6_ADDR_SCOPE_LINKLOCAL)
710 return;
711
712 if (mc->mca_flags&MAF_LOADED) {
713 mc->mca_flags &= ~MAF_LOADED;
714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
715 dev_mc_del(dev, buf);
716 }
717
718 if (mc->mca_flags & MAF_NOREPORT)
719 return;
720
721 if (!mc->idev->dead)
722 igmp6_leave_group(mc);
723
724 if (cancel_delayed_work(&mc->mca_work))
725 refcount_dec(&mc->mca_refcnt);
726}
727
728/*
729 * deleted ifmcaddr6 manipulation
730 * called with mc_lock
731 */
732static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
733{
734 struct ifmcaddr6 *pmc;
735
736 /* this is an "ifmcaddr6" for convenience; only the fields below
737 * are actually used. In particular, the refcnt and users are not
738 * used for management of the delete list. Using the same structure
739 * for deleted items allows change reports to use common code with
740 * non-deleted or query-response MCA's.
741 */
742 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
743 if (!pmc)
744 return;
745
746 pmc->idev = im->idev;
747 in6_dev_hold(idev);
748 pmc->mca_addr = im->mca_addr;
749 pmc->mca_crcount = idev->mc_qrv;
750 pmc->mca_sfmode = im->mca_sfmode;
751 if (pmc->mca_sfmode == MCAST_INCLUDE) {
752 struct ip6_sf_list *psf;
753
754 rcu_assign_pointer(pmc->mca_tomb,
755 mc_dereference(im->mca_tomb, idev));
756 rcu_assign_pointer(pmc->mca_sources,
757 mc_dereference(im->mca_sources, idev));
758 RCU_INIT_POINTER(im->mca_tomb, NULL);
759 RCU_INIT_POINTER(im->mca_sources, NULL);
760
761 for_each_psf_mclock(pmc, psf)
762 psf->sf_crcount = pmc->mca_crcount;
763 }
764
765 rcu_assign_pointer(pmc->next, idev->mc_tomb);
766 rcu_assign_pointer(idev->mc_tomb, pmc);
767}
768
769/* called with mc_lock */
770static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
771{
772 struct ip6_sf_list *psf, *sources, *tomb;
773 struct in6_addr *pmca = &im->mca_addr;
774 struct ifmcaddr6 *pmc, *pmc_prev;
775
776 pmc_prev = NULL;
777 for_each_mc_tomb(idev, pmc) {
778 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
779 break;
780 pmc_prev = pmc;
781 }
782 if (pmc) {
783 if (pmc_prev)
784 rcu_assign_pointer(pmc_prev->next, pmc->next);
785 else
786 rcu_assign_pointer(idev->mc_tomb, pmc->next);
787 }
788
789 if (pmc) {
790 im->idev = pmc->idev;
791 if (im->mca_sfmode == MCAST_INCLUDE) {
792 tomb = rcu_replace_pointer(im->mca_tomb,
793 mc_dereference(pmc->mca_tomb, pmc->idev),
794 lockdep_is_held(&im->idev->mc_lock));
795 rcu_assign_pointer(pmc->mca_tomb, tomb);
796
797 sources = rcu_replace_pointer(im->mca_sources,
798 mc_dereference(pmc->mca_sources, pmc->idev),
799 lockdep_is_held(&im->idev->mc_lock));
800 rcu_assign_pointer(pmc->mca_sources, sources);
801 for_each_psf_mclock(im, psf)
802 psf->sf_crcount = idev->mc_qrv;
803 } else {
804 im->mca_crcount = idev->mc_qrv;
805 }
806 in6_dev_put(pmc->idev);
807 ip6_mc_clear_src(pmc);
808 kfree_rcu(pmc, rcu);
809 }
810}
811
812/* called with mc_lock */
813static void mld_clear_delrec(struct inet6_dev *idev)
814{
815 struct ifmcaddr6 *pmc, *nextpmc;
816
817 pmc = mc_dereference(idev->mc_tomb, idev);
818 RCU_INIT_POINTER(idev->mc_tomb, NULL);
819
820 for (; pmc; pmc = nextpmc) {
821 nextpmc = mc_dereference(pmc->next, idev);
822 ip6_mc_clear_src(pmc);
823 in6_dev_put(pmc->idev);
824 kfree_rcu(pmc, rcu);
825 }
826
827 /* clear dead sources, too */
828 for_each_mc_mclock(idev, pmc) {
829 struct ip6_sf_list *psf, *psf_next;
830
831 psf = mc_dereference(pmc->mca_tomb, idev);
832 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
833 for (; psf; psf = psf_next) {
834 psf_next = mc_dereference(psf->sf_next, idev);
835 kfree_rcu(psf, rcu);
836 }
837 }
838}
839
840static void mld_clear_query(struct inet6_dev *idev)
841{
842 struct sk_buff *skb;
843
844 spin_lock_bh(&idev->mc_query_lock);
845 while ((skb = __skb_dequeue(&idev->mc_query_queue)))
846 kfree_skb(skb);
847 spin_unlock_bh(&idev->mc_query_lock);
848}
849
850static void mld_clear_report(struct inet6_dev *idev)
851{
852 struct sk_buff *skb;
853
854 spin_lock_bh(&idev->mc_report_lock);
855 while ((skb = __skb_dequeue(&idev->mc_report_queue)))
856 kfree_skb(skb);
857 spin_unlock_bh(&idev->mc_report_lock);
858}
859
860static void mca_get(struct ifmcaddr6 *mc)
861{
862 refcount_inc(&mc->mca_refcnt);
863}
864
865static void ma_put(struct ifmcaddr6 *mc)
866{
867 if (refcount_dec_and_test(&mc->mca_refcnt)) {
868 in6_dev_put(mc->idev);
869 kfree_rcu(mc, rcu);
870 }
871}
872
873/* called with mc_lock */
874static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
875 const struct in6_addr *addr,
876 unsigned int mode)
877{
878 struct ifmcaddr6 *mc;
879
880 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
881 if (!mc)
882 return NULL;
883
884 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work);
885
886 mc->mca_addr = *addr;
887 mc->idev = idev; /* reference taken by caller */
888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 refcount_set(&mc->mca_refcnt, 1);
892
893 mc->mca_sfmode = mode;
894 mc->mca_sfcount[mode] = 1;
895
896 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
897 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
898 mc->mca_flags |= MAF_NOREPORT;
899
900 return mc;
901}
902
903/*
904 * device multicast group inc (add if not found)
905 */
906static int __ipv6_dev_mc_inc(struct net_device *dev,
907 const struct in6_addr *addr, unsigned int mode)
908{
909 struct ifmcaddr6 *mc;
910 struct inet6_dev *idev;
911
912 ASSERT_RTNL();
913
914 /* we need to take a reference on idev */
915 idev = in6_dev_get(dev);
916
917 if (!idev)
918 return -EINVAL;
919
920 if (idev->dead) {
921 in6_dev_put(idev);
922 return -ENODEV;
923 }
924
925 mutex_lock(&idev->mc_lock);
926 for_each_mc_mclock(idev, mc) {
927 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
928 mc->mca_users++;
929 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
930 mutex_unlock(&idev->mc_lock);
931 in6_dev_put(idev);
932 return 0;
933 }
934 }
935
936 mc = mca_alloc(idev, addr, mode);
937 if (!mc) {
938 mutex_unlock(&idev->mc_lock);
939 in6_dev_put(idev);
940 return -ENOMEM;
941 }
942
943 rcu_assign_pointer(mc->next, idev->mc_list);
944 rcu_assign_pointer(idev->mc_list, mc);
945
946 mca_get(mc);
947
948 mld_del_delrec(idev, mc);
949 igmp6_group_added(mc);
950 mutex_unlock(&idev->mc_lock);
951 ma_put(mc);
952 return 0;
953}
954
955int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
956{
957 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
958}
959EXPORT_SYMBOL(ipv6_dev_mc_inc);
960
961/*
962 * device multicast group del
963 */
964int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
965{
966 struct ifmcaddr6 *ma, __rcu **map;
967
968 ASSERT_RTNL();
969
970 mutex_lock(&idev->mc_lock);
971 for (map = &idev->mc_list;
972 (ma = mc_dereference(*map, idev));
973 map = &ma->next) {
974 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
975 if (--ma->mca_users == 0) {
976 *map = ma->next;
977
978 igmp6_group_dropped(ma);
979 ip6_mc_clear_src(ma);
980 mutex_unlock(&idev->mc_lock);
981
982 ma_put(ma);
983 return 0;
984 }
985 mutex_unlock(&idev->mc_lock);
986 return 0;
987 }
988 }
989
990 mutex_unlock(&idev->mc_lock);
991 return -ENOENT;
992}
993
994int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
995{
996 struct inet6_dev *idev;
997 int err;
998
999 ASSERT_RTNL();
1000
1001 idev = __in6_dev_get(dev);
1002 if (!idev)
1003 err = -ENODEV;
1004 else
1005 err = __ipv6_dev_mc_dec(idev, addr);
1006
1007 return err;
1008}
1009EXPORT_SYMBOL(ipv6_dev_mc_dec);
1010
1011/*
1012 * check if the interface/address pair is valid
1013 */
1014bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1015 const struct in6_addr *src_addr)
1016{
1017 struct inet6_dev *idev;
1018 struct ifmcaddr6 *mc;
1019 bool rv = false;
1020
1021 rcu_read_lock();
1022 idev = __in6_dev_get(dev);
1023 if (idev) {
1024 for_each_mc_rcu(idev, mc) {
1025 if (ipv6_addr_equal(&mc->mca_addr, group))
1026 break;
1027 }
1028 if (mc) {
1029 if (src_addr && !ipv6_addr_any(src_addr)) {
1030 struct ip6_sf_list *psf;
1031
1032 for_each_psf_rcu(mc, psf) {
1033 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1034 break;
1035 }
1036 if (psf)
1037 rv = psf->sf_count[MCAST_INCLUDE] ||
1038 psf->sf_count[MCAST_EXCLUDE] !=
1039 mc->mca_sfcount[MCAST_EXCLUDE];
1040 else
1041 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1042 } else
1043 rv = true; /* don't filter unspecified source */
1044 }
1045 }
1046 rcu_read_unlock();
1047 return rv;
1048}
1049
1050/* called with mc_lock */
1051static void mld_gq_start_work(struct inet6_dev *idev)
1052{
1053 unsigned long tv = get_random_u32_below(idev->mc_maxdelay);
1054
1055 idev->mc_gq_running = 1;
1056 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
1057 in6_dev_hold(idev);
1058}
1059
1060/* called with mc_lock */
1061static void mld_gq_stop_work(struct inet6_dev *idev)
1062{
1063 idev->mc_gq_running = 0;
1064 if (cancel_delayed_work(&idev->mc_gq_work))
1065 __in6_dev_put(idev);
1066}
1067
1068/* called with mc_lock */
1069static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
1070{
1071 unsigned long tv = get_random_u32_below(delay);
1072
1073 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
1074 in6_dev_hold(idev);
1075}
1076
1077/* called with mc_lock */
1078static void mld_ifc_stop_work(struct inet6_dev *idev)
1079{
1080 idev->mc_ifc_count = 0;
1081 if (cancel_delayed_work(&idev->mc_ifc_work))
1082 __in6_dev_put(idev);
1083}
1084
1085/* called with mc_lock */
1086static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
1087{
1088 unsigned long tv = get_random_u32_below(delay);
1089
1090 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
1091 in6_dev_hold(idev);
1092}
1093
1094static void mld_dad_stop_work(struct inet6_dev *idev)
1095{
1096 if (cancel_delayed_work(&idev->mc_dad_work))
1097 __in6_dev_put(idev);
1098}
1099
1100static void mld_query_stop_work(struct inet6_dev *idev)
1101{
1102 spin_lock_bh(&idev->mc_query_lock);
1103 if (cancel_delayed_work(&idev->mc_query_work))
1104 __in6_dev_put(idev);
1105 spin_unlock_bh(&idev->mc_query_lock);
1106}
1107
1108static void mld_report_stop_work(struct inet6_dev *idev)
1109{
1110 if (cancel_delayed_work_sync(&idev->mc_report_work))
1111 __in6_dev_put(idev);
1112}
1113
1114/*
1115 * IGMP handling (alias multicast ICMPv6 messages)
1116 * called with mc_lock
1117 */
1118static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1119{
1120 unsigned long delay = resptime;
1121
1122 /* Do not start work for these addresses */
1123 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1124 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1125 return;
1126
1127 if (cancel_delayed_work(&ma->mca_work)) {
1128 refcount_dec(&ma->mca_refcnt);
1129 delay = ma->mca_work.timer.expires - jiffies;
1130 }
1131
1132 if (delay >= resptime)
1133 delay = get_random_u32_below(resptime);
1134
1135 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
1136 refcount_inc(&ma->mca_refcnt);
1137 ma->mca_flags |= MAF_TIMER_RUNNING;
1138}
1139
1140/* mark EXCLUDE-mode sources
1141 * called with mc_lock
1142 */
1143static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1144 const struct in6_addr *srcs)
1145{
1146 struct ip6_sf_list *psf;
1147 int i, scount;
1148
1149 scount = 0;
1150 for_each_psf_mclock(pmc, psf) {
1151 if (scount == nsrcs)
1152 break;
1153 for (i = 0; i < nsrcs; i++) {
1154 /* skip inactive filters */
1155 if (psf->sf_count[MCAST_INCLUDE] ||
1156 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1157 psf->sf_count[MCAST_EXCLUDE])
1158 break;
1159 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1160 scount++;
1161 break;
1162 }
1163 }
1164 }
1165 pmc->mca_flags &= ~MAF_GSQUERY;
1166 if (scount == nsrcs) /* all sources excluded */
1167 return false;
1168 return true;
1169}
1170
1171/* called with mc_lock */
1172static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1173 const struct in6_addr *srcs)
1174{
1175 struct ip6_sf_list *psf;
1176 int i, scount;
1177
1178 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1179 return mld_xmarksources(pmc, nsrcs, srcs);
1180
1181 /* mark INCLUDE-mode sources */
1182
1183 scount = 0;
1184 for_each_psf_mclock(pmc, psf) {
1185 if (scount == nsrcs)
1186 break;
1187 for (i = 0; i < nsrcs; i++) {
1188 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1189 psf->sf_gsresp = 1;
1190 scount++;
1191 break;
1192 }
1193 }
1194 }
1195 if (!scount) {
1196 pmc->mca_flags &= ~MAF_GSQUERY;
1197 return false;
1198 }
1199 pmc->mca_flags |= MAF_GSQUERY;
1200 return true;
1201}
1202
1203static int mld_force_mld_version(const struct inet6_dev *idev)
1204{
1205 /* Normally, both are 0 here. If enforcement to a particular is
1206 * being used, individual device enforcement will have a lower
1207 * precedence over 'all' device (.../conf/all/force_mld_version).
1208 */
1209
1210 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1211 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1212 else
1213 return idev->cnf.force_mld_version;
1214}
1215
1216static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1217{
1218 return mld_force_mld_version(idev) == 2;
1219}
1220
1221static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1222{
1223 return mld_force_mld_version(idev) == 1;
1224}
1225
1226static bool mld_in_v1_mode(const struct inet6_dev *idev)
1227{
1228 if (mld_in_v2_mode_only(idev))
1229 return false;
1230 if (mld_in_v1_mode_only(idev))
1231 return true;
1232 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1233 return true;
1234
1235 return false;
1236}
1237
1238static void mld_set_v1_mode(struct inet6_dev *idev)
1239{
1240 /* RFC3810, relevant sections:
1241 * - 9.1. Robustness Variable
1242 * - 9.2. Query Interval
1243 * - 9.3. Query Response Interval
1244 * - 9.12. Older Version Querier Present Timeout
1245 */
1246 unsigned long switchback;
1247
1248 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1249
1250 idev->mc_v1_seen = jiffies + switchback;
1251}
1252
1253static void mld_update_qrv(struct inet6_dev *idev,
1254 const struct mld2_query *mlh2)
1255{
1256 /* RFC3810, relevant sections:
1257 * - 5.1.8. QRV (Querier's Robustness Variable)
1258 * - 9.1. Robustness Variable
1259 */
1260
1261 /* The value of the Robustness Variable MUST NOT be zero,
1262 * and SHOULD NOT be one. Catch this here if we ever run
1263 * into such a case in future.
1264 */
1265 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1266 WARN_ON(idev->mc_qrv == 0);
1267
1268 if (mlh2->mld2q_qrv > 0)
1269 idev->mc_qrv = mlh2->mld2q_qrv;
1270
1271 if (unlikely(idev->mc_qrv < min_qrv)) {
1272 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1273 idev->mc_qrv, min_qrv);
1274 idev->mc_qrv = min_qrv;
1275 }
1276}
1277
1278static void mld_update_qi(struct inet6_dev *idev,
1279 const struct mld2_query *mlh2)
1280{
1281 /* RFC3810, relevant sections:
1282 * - 5.1.9. QQIC (Querier's Query Interval Code)
1283 * - 9.2. Query Interval
1284 * - 9.12. Older Version Querier Present Timeout
1285 * (the [Query Interval] in the last Query received)
1286 */
1287 unsigned long mc_qqi;
1288
1289 if (mlh2->mld2q_qqic < 128) {
1290 mc_qqi = mlh2->mld2q_qqic;
1291 } else {
1292 unsigned long mc_man, mc_exp;
1293
1294 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1295 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1296
1297 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1298 }
1299
1300 idev->mc_qi = mc_qqi * HZ;
1301}
1302
1303static void mld_update_qri(struct inet6_dev *idev,
1304 const struct mld2_query *mlh2)
1305{
1306 /* RFC3810, relevant sections:
1307 * - 5.1.3. Maximum Response Code
1308 * - 9.3. Query Response Interval
1309 */
1310 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1311}
1312
1313static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1314 unsigned long *max_delay, bool v1_query)
1315{
1316 unsigned long mldv1_md;
1317
1318 /* Ignore v1 queries */
1319 if (mld_in_v2_mode_only(idev))
1320 return -EINVAL;
1321
1322 mldv1_md = ntohs(mld->mld_maxdelay);
1323
1324 /* When in MLDv1 fallback and a MLDv2 router start-up being
1325 * unaware of current MLDv1 operation, the MRC == MRD mapping
1326 * only works when the exponential algorithm is not being
1327 * used (as MLDv1 is unaware of such things).
1328 *
1329 * According to the RFC author, the MLDv2 implementations
1330 * he's aware of all use a MRC < 32768 on start up queries.
1331 *
1332 * Thus, should we *ever* encounter something else larger
1333 * than that, just assume the maximum possible within our
1334 * reach.
1335 */
1336 if (!v1_query)
1337 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1338
1339 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1340
1341 /* MLDv1 router present: we need to go into v1 mode *only*
1342 * when an MLDv1 query is received as per section 9.12. of
1343 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1344 * queries MUST be of exactly 24 octets.
1345 */
1346 if (v1_query)
1347 mld_set_v1_mode(idev);
1348
1349 /* cancel MLDv2 report work */
1350 mld_gq_stop_work(idev);
1351 /* cancel the interface change work */
1352 mld_ifc_stop_work(idev);
1353 /* clear deleted report items */
1354 mld_clear_delrec(idev);
1355
1356 return 0;
1357}
1358
1359static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1360 unsigned long *max_delay)
1361{
1362 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1363
1364 mld_update_qrv(idev, mld);
1365 mld_update_qi(idev, mld);
1366 mld_update_qri(idev, mld);
1367
1368 idev->mc_maxdelay = *max_delay;
1369
1370 return;
1371}
1372
1373/* called with rcu_read_lock() */
1374void igmp6_event_query(struct sk_buff *skb)
1375{
1376 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1377
1378 if (!idev || idev->dead)
1379 goto out;
1380
1381 spin_lock_bh(&idev->mc_query_lock);
1382 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) {
1383 __skb_queue_tail(&idev->mc_query_queue, skb);
1384 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0))
1385 in6_dev_hold(idev);
1386 skb = NULL;
1387 }
1388 spin_unlock_bh(&idev->mc_query_lock);
1389out:
1390 kfree_skb(skb);
1391}
1392
1393static void __mld_query_work(struct sk_buff *skb)
1394{
1395 struct mld2_query *mlh2 = NULL;
1396 const struct in6_addr *group;
1397 unsigned long max_delay;
1398 struct inet6_dev *idev;
1399 struct ifmcaddr6 *ma;
1400 struct mld_msg *mld;
1401 int group_type;
1402 int mark = 0;
1403 int len, err;
1404
1405 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1406 goto kfree_skb;
1407
1408 /* compute payload length excluding extension headers */
1409 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1410 len -= skb_network_header_len(skb);
1411
1412 /* RFC3810 6.2
1413 * Upon reception of an MLD message that contains a Query, the node
1414 * checks if the source address of the message is a valid link-local
1415 * address, if the Hop Limit is set to 1, and if the Router Alert
1416 * option is present in the Hop-By-Hop Options header of the IPv6
1417 * packet. If any of these checks fails, the packet is dropped.
1418 */
1419 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1420 ipv6_hdr(skb)->hop_limit != 1 ||
1421 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1422 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1423 goto kfree_skb;
1424
1425 idev = in6_dev_get(skb->dev);
1426 if (!idev)
1427 goto kfree_skb;
1428
1429 mld = (struct mld_msg *)icmp6_hdr(skb);
1430 group = &mld->mld_mca;
1431 group_type = ipv6_addr_type(group);
1432
1433 if (group_type != IPV6_ADDR_ANY &&
1434 !(group_type&IPV6_ADDR_MULTICAST))
1435 goto out;
1436
1437 if (len < MLD_V1_QUERY_LEN) {
1438 goto out;
1439 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1440 err = mld_process_v1(idev, mld, &max_delay,
1441 len == MLD_V1_QUERY_LEN);
1442 if (err < 0)
1443 goto out;
1444 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1445 int srcs_offset = sizeof(struct mld2_query) -
1446 sizeof(struct icmp6hdr);
1447
1448 if (!pskb_may_pull(skb, srcs_offset))
1449 goto out;
1450
1451 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1452
1453 mld_process_v2(idev, mlh2, &max_delay);
1454
1455 if (group_type == IPV6_ADDR_ANY) { /* general query */
1456 if (mlh2->mld2q_nsrcs)
1457 goto out; /* no sources allowed */
1458
1459 mld_gq_start_work(idev);
1460 goto out;
1461 }
1462 /* mark sources to include, if group & source-specific */
1463 if (mlh2->mld2q_nsrcs != 0) {
1464 if (!pskb_may_pull(skb, srcs_offset +
1465 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1466 goto out;
1467
1468 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1469 mark = 1;
1470 }
1471 } else {
1472 goto out;
1473 }
1474
1475 if (group_type == IPV6_ADDR_ANY) {
1476 for_each_mc_mclock(idev, ma) {
1477 igmp6_group_queried(ma, max_delay);
1478 }
1479 } else {
1480 for_each_mc_mclock(idev, ma) {
1481 if (!ipv6_addr_equal(group, &ma->mca_addr))
1482 continue;
1483 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1484 /* gsquery <- gsquery && mark */
1485 if (!mark)
1486 ma->mca_flags &= ~MAF_GSQUERY;
1487 } else {
1488 /* gsquery <- mark */
1489 if (mark)
1490 ma->mca_flags |= MAF_GSQUERY;
1491 else
1492 ma->mca_flags &= ~MAF_GSQUERY;
1493 }
1494 if (!(ma->mca_flags & MAF_GSQUERY) ||
1495 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1496 igmp6_group_queried(ma, max_delay);
1497 break;
1498 }
1499 }
1500
1501out:
1502 in6_dev_put(idev);
1503kfree_skb:
1504 consume_skb(skb);
1505}
1506
1507static void mld_query_work(struct work_struct *work)
1508{
1509 struct inet6_dev *idev = container_of(to_delayed_work(work),
1510 struct inet6_dev,
1511 mc_query_work);
1512 struct sk_buff_head q;
1513 struct sk_buff *skb;
1514 bool rework = false;
1515 int cnt = 0;
1516
1517 skb_queue_head_init(&q);
1518
1519 spin_lock_bh(&idev->mc_query_lock);
1520 while ((skb = __skb_dequeue(&idev->mc_query_queue))) {
1521 __skb_queue_tail(&q, skb);
1522
1523 if (++cnt >= MLD_MAX_QUEUE) {
1524 rework = true;
1525 break;
1526 }
1527 }
1528 spin_unlock_bh(&idev->mc_query_lock);
1529
1530 mutex_lock(&idev->mc_lock);
1531 while ((skb = __skb_dequeue(&q)))
1532 __mld_query_work(skb);
1533 mutex_unlock(&idev->mc_lock);
1534
1535 if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0))
1536 return;
1537
1538 in6_dev_put(idev);
1539}
1540
1541/* called with rcu_read_lock() */
1542void igmp6_event_report(struct sk_buff *skb)
1543{
1544 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1545
1546 if (!idev || idev->dead)
1547 goto out;
1548
1549 spin_lock_bh(&idev->mc_report_lock);
1550 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) {
1551 __skb_queue_tail(&idev->mc_report_queue, skb);
1552 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0))
1553 in6_dev_hold(idev);
1554 skb = NULL;
1555 }
1556 spin_unlock_bh(&idev->mc_report_lock);
1557out:
1558 kfree_skb(skb);
1559}
1560
1561static void __mld_report_work(struct sk_buff *skb)
1562{
1563 struct inet6_dev *idev;
1564 struct ifmcaddr6 *ma;
1565 struct mld_msg *mld;
1566 int addr_type;
1567
1568 /* Our own report looped back. Ignore it. */
1569 if (skb->pkt_type == PACKET_LOOPBACK)
1570 goto kfree_skb;
1571
1572 /* send our report if the MC router may not have heard this report */
1573 if (skb->pkt_type != PACKET_MULTICAST &&
1574 skb->pkt_type != PACKET_BROADCAST)
1575 goto kfree_skb;
1576
1577 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1578 goto kfree_skb;
1579
1580 mld = (struct mld_msg *)icmp6_hdr(skb);
1581
1582 /* Drop reports with not link local source */
1583 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1584 if (addr_type != IPV6_ADDR_ANY &&
1585 !(addr_type&IPV6_ADDR_LINKLOCAL))
1586 goto kfree_skb;
1587
1588 idev = in6_dev_get(skb->dev);
1589 if (!idev)
1590 goto kfree_skb;
1591
1592 /*
1593 * Cancel the work for this group
1594 */
1595
1596 for_each_mc_mclock(idev, ma) {
1597 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1598 if (cancel_delayed_work(&ma->mca_work))
1599 refcount_dec(&ma->mca_refcnt);
1600 ma->mca_flags &= ~(MAF_LAST_REPORTER |
1601 MAF_TIMER_RUNNING);
1602 break;
1603 }
1604 }
1605
1606 in6_dev_put(idev);
1607kfree_skb:
1608 consume_skb(skb);
1609}
1610
1611static void mld_report_work(struct work_struct *work)
1612{
1613 struct inet6_dev *idev = container_of(to_delayed_work(work),
1614 struct inet6_dev,
1615 mc_report_work);
1616 struct sk_buff_head q;
1617 struct sk_buff *skb;
1618 bool rework = false;
1619 int cnt = 0;
1620
1621 skb_queue_head_init(&q);
1622 spin_lock_bh(&idev->mc_report_lock);
1623 while ((skb = __skb_dequeue(&idev->mc_report_queue))) {
1624 __skb_queue_tail(&q, skb);
1625
1626 if (++cnt >= MLD_MAX_QUEUE) {
1627 rework = true;
1628 break;
1629 }
1630 }
1631 spin_unlock_bh(&idev->mc_report_lock);
1632
1633 mutex_lock(&idev->mc_lock);
1634 while ((skb = __skb_dequeue(&q)))
1635 __mld_report_work(skb);
1636 mutex_unlock(&idev->mc_lock);
1637
1638 if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0))
1639 return;
1640
1641 in6_dev_put(idev);
1642}
1643
1644static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1645 int gdeleted, int sdeleted)
1646{
1647 switch (type) {
1648 case MLD2_MODE_IS_INCLUDE:
1649 case MLD2_MODE_IS_EXCLUDE:
1650 if (gdeleted || sdeleted)
1651 return false;
1652 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1653 if (pmc->mca_sfmode == MCAST_INCLUDE)
1654 return true;
1655 /* don't include if this source is excluded
1656 * in all filters
1657 */
1658 if (psf->sf_count[MCAST_INCLUDE])
1659 return type == MLD2_MODE_IS_INCLUDE;
1660 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1661 psf->sf_count[MCAST_EXCLUDE];
1662 }
1663 return false;
1664 case MLD2_CHANGE_TO_INCLUDE:
1665 if (gdeleted || sdeleted)
1666 return false;
1667 return psf->sf_count[MCAST_INCLUDE] != 0;
1668 case MLD2_CHANGE_TO_EXCLUDE:
1669 if (gdeleted || sdeleted)
1670 return false;
1671 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1672 psf->sf_count[MCAST_INCLUDE])
1673 return false;
1674 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1675 psf->sf_count[MCAST_EXCLUDE];
1676 case MLD2_ALLOW_NEW_SOURCES:
1677 if (gdeleted || !psf->sf_crcount)
1678 return false;
1679 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1680 case MLD2_BLOCK_OLD_SOURCES:
1681 if (pmc->mca_sfmode == MCAST_INCLUDE)
1682 return gdeleted || (psf->sf_crcount && sdeleted);
1683 return psf->sf_crcount && !gdeleted && !sdeleted;
1684 }
1685 return false;
1686}
1687
1688static int
1689mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1690{
1691 struct ip6_sf_list *psf;
1692 int scount = 0;
1693
1694 for_each_psf_mclock(pmc, psf) {
1695 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1696 continue;
1697 scount++;
1698 }
1699 return scount;
1700}
1701
1702static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1703 struct net_device *dev,
1704 const struct in6_addr *saddr,
1705 const struct in6_addr *daddr,
1706 int proto, int len)
1707{
1708 struct ipv6hdr *hdr;
1709
1710 skb->protocol = htons(ETH_P_IPV6);
1711 skb->dev = dev;
1712
1713 skb_reset_network_header(skb);
1714 skb_put(skb, sizeof(struct ipv6hdr));
1715 hdr = ipv6_hdr(skb);
1716
1717 ip6_flow_hdr(hdr, 0, 0);
1718
1719 hdr->payload_len = htons(len);
1720 hdr->nexthdr = proto;
1721 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1722
1723 hdr->saddr = *saddr;
1724 hdr->daddr = *daddr;
1725}
1726
1727static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1728{
1729 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1730 2, 0, 0, IPV6_TLV_PADN, 0 };
1731 struct net_device *dev = idev->dev;
1732 int hlen = LL_RESERVED_SPACE(dev);
1733 int tlen = dev->needed_tailroom;
1734 struct net *net = dev_net(dev);
1735 const struct in6_addr *saddr;
1736 struct in6_addr addr_buf;
1737 struct mld2_report *pmr;
1738 struct sk_buff *skb;
1739 unsigned int size;
1740 struct sock *sk;
1741 int err;
1742
1743 sk = net->ipv6.igmp_sk;
1744 /* we assume size > sizeof(ra) here
1745 * Also try to not allocate high-order pages for big MTU
1746 */
1747 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
1748 skb = sock_alloc_send_skb(sk, size, 1, &err);
1749 if (!skb)
1750 return NULL;
1751
1752 skb->priority = TC_PRIO_CONTROL;
1753 skb_reserve(skb, hlen);
1754 skb_tailroom_reserve(skb, mtu, tlen);
1755
1756 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1757 /* <draft-ietf-magma-mld-source-05.txt>:
1758 * use unspecified address as the source address
1759 * when a valid link-local address is not available.
1760 */
1761 saddr = &in6addr_any;
1762 } else
1763 saddr = &addr_buf;
1764
1765 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1766
1767 skb_put_data(skb, ra, sizeof(ra));
1768
1769 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1770 skb_put(skb, sizeof(*pmr));
1771 pmr = (struct mld2_report *)skb_transport_header(skb);
1772 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1773 pmr->mld2r_resv1 = 0;
1774 pmr->mld2r_cksum = 0;
1775 pmr->mld2r_resv2 = 0;
1776 pmr->mld2r_ngrec = 0;
1777 return skb;
1778}
1779
1780static void mld_sendpack(struct sk_buff *skb)
1781{
1782 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1783 struct mld2_report *pmr =
1784 (struct mld2_report *)skb_transport_header(skb);
1785 int payload_len, mldlen;
1786 struct inet6_dev *idev;
1787 struct net *net = dev_net(skb->dev);
1788 int err;
1789 struct flowi6 fl6;
1790 struct dst_entry *dst;
1791
1792 rcu_read_lock();
1793 idev = __in6_dev_get(skb->dev);
1794 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1795
1796 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1797 sizeof(*pip6);
1798 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1799 pip6->payload_len = htons(payload_len);
1800
1801 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1802 IPPROTO_ICMPV6,
1803 csum_partial(skb_transport_header(skb),
1804 mldlen, 0));
1805
1806 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1807 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1808 skb->dev->ifindex);
1809 dst = icmp6_dst_alloc(skb->dev, &fl6);
1810
1811 err = 0;
1812 if (IS_ERR(dst)) {
1813 err = PTR_ERR(dst);
1814 dst = NULL;
1815 }
1816 skb_dst_set(skb, dst);
1817 if (err)
1818 goto err_out;
1819
1820 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1821 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1822 dst_output);
1823out:
1824 if (!err) {
1825 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1826 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1827 } else {
1828 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1829 }
1830
1831 rcu_read_unlock();
1832 return;
1833
1834err_out:
1835 kfree_skb(skb);
1836 goto out;
1837}
1838
1839static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1840{
1841 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1842}
1843
1844static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1845 int type, struct mld2_grec **ppgr, unsigned int mtu)
1846{
1847 struct mld2_report *pmr;
1848 struct mld2_grec *pgr;
1849
1850 if (!skb) {
1851 skb = mld_newpack(pmc->idev, mtu);
1852 if (!skb)
1853 return NULL;
1854 }
1855 pgr = skb_put(skb, sizeof(struct mld2_grec));
1856 pgr->grec_type = type;
1857 pgr->grec_auxwords = 0;
1858 pgr->grec_nsrcs = 0;
1859 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1860 pmr = (struct mld2_report *)skb_transport_header(skb);
1861 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1862 *ppgr = pgr;
1863 return skb;
1864}
1865
1866#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1867
1868/* called with mc_lock */
1869static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1870 int type, int gdeleted, int sdeleted,
1871 int crsend)
1872{
1873 struct ip6_sf_list *psf, *psf_prev, *psf_next;
1874 int scount, stotal, first, isquery, truncate;
1875 struct ip6_sf_list __rcu **psf_list;
1876 struct inet6_dev *idev = pmc->idev;
1877 struct net_device *dev = idev->dev;
1878 struct mld2_grec *pgr = NULL;
1879 struct mld2_report *pmr;
1880 unsigned int mtu;
1881
1882 if (pmc->mca_flags & MAF_NOREPORT)
1883 return skb;
1884
1885 mtu = READ_ONCE(dev->mtu);
1886 if (mtu < IPV6_MIN_MTU)
1887 return skb;
1888
1889 isquery = type == MLD2_MODE_IS_INCLUDE ||
1890 type == MLD2_MODE_IS_EXCLUDE;
1891 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1892 type == MLD2_CHANGE_TO_EXCLUDE;
1893
1894 stotal = scount = 0;
1895
1896 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1897
1898 if (!rcu_access_pointer(*psf_list))
1899 goto empty_source;
1900
1901 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1902
1903 /* EX and TO_EX get a fresh packet, if needed */
1904 if (truncate) {
1905 if (pmr && pmr->mld2r_ngrec &&
1906 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1907 if (skb)
1908 mld_sendpack(skb);
1909 skb = mld_newpack(idev, mtu);
1910 }
1911 }
1912 first = 1;
1913 psf_prev = NULL;
1914 for (psf = mc_dereference(*psf_list, idev);
1915 psf;
1916 psf = psf_next) {
1917 struct in6_addr *psrc;
1918
1919 psf_next = mc_dereference(psf->sf_next, idev);
1920
1921 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1922 psf_prev = psf;
1923 continue;
1924 }
1925
1926 /* Based on RFC3810 6.1. Should not send source-list change
1927 * records when there is a filter mode change.
1928 */
1929 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1930 (!gdeleted && pmc->mca_crcount)) &&
1931 (type == MLD2_ALLOW_NEW_SOURCES ||
1932 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1933 goto decrease_sf_crcount;
1934
1935 /* clear marks on query responses */
1936 if (isquery)
1937 psf->sf_gsresp = 0;
1938
1939 if (AVAILABLE(skb) < sizeof(*psrc) +
1940 first*sizeof(struct mld2_grec)) {
1941 if (truncate && !first)
1942 break; /* truncate these */
1943 if (pgr)
1944 pgr->grec_nsrcs = htons(scount);
1945 if (skb)
1946 mld_sendpack(skb);
1947 skb = mld_newpack(idev, mtu);
1948 first = 1;
1949 scount = 0;
1950 }
1951 if (first) {
1952 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1953 first = 0;
1954 }
1955 if (!skb)
1956 return NULL;
1957 psrc = skb_put(skb, sizeof(*psrc));
1958 *psrc = psf->sf_addr;
1959 scount++; stotal++;
1960 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1961 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1962decrease_sf_crcount:
1963 psf->sf_crcount--;
1964 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1965 if (psf_prev)
1966 rcu_assign_pointer(psf_prev->sf_next,
1967 mc_dereference(psf->sf_next, idev));
1968 else
1969 rcu_assign_pointer(*psf_list,
1970 mc_dereference(psf->sf_next, idev));
1971 kfree_rcu(psf, rcu);
1972 continue;
1973 }
1974 }
1975 psf_prev = psf;
1976 }
1977
1978empty_source:
1979 if (!stotal) {
1980 if (type == MLD2_ALLOW_NEW_SOURCES ||
1981 type == MLD2_BLOCK_OLD_SOURCES)
1982 return skb;
1983 if (pmc->mca_crcount || isquery || crsend) {
1984 /* make sure we have room for group header */
1985 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1986 mld_sendpack(skb);
1987 skb = NULL; /* add_grhead will get a new one */
1988 }
1989 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1990 }
1991 }
1992 if (pgr)
1993 pgr->grec_nsrcs = htons(scount);
1994
1995 if (isquery)
1996 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1997 return skb;
1998}
1999
2000/* called with mc_lock */
2001static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2002{
2003 struct sk_buff *skb = NULL;
2004 int type;
2005
2006 if (!pmc) {
2007 for_each_mc_mclock(idev, pmc) {
2008 if (pmc->mca_flags & MAF_NOREPORT)
2009 continue;
2010 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2011 type = MLD2_MODE_IS_EXCLUDE;
2012 else
2013 type = MLD2_MODE_IS_INCLUDE;
2014 skb = add_grec(skb, pmc, type, 0, 0, 0);
2015 }
2016 } else {
2017 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2018 type = MLD2_MODE_IS_EXCLUDE;
2019 else
2020 type = MLD2_MODE_IS_INCLUDE;
2021 skb = add_grec(skb, pmc, type, 0, 0, 0);
2022 }
2023 if (skb)
2024 mld_sendpack(skb);
2025}
2026
2027/*
2028 * remove zero-count source records from a source filter list
2029 * called with mc_lock
2030 */
2031static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
2032{
2033 struct ip6_sf_list *psf_prev, *psf_next, *psf;
2034
2035 psf_prev = NULL;
2036 for (psf = mc_dereference(*ppsf, idev);
2037 psf;
2038 psf = psf_next) {
2039 psf_next = mc_dereference(psf->sf_next, idev);
2040 if (psf->sf_crcount == 0) {
2041 if (psf_prev)
2042 rcu_assign_pointer(psf_prev->sf_next,
2043 mc_dereference(psf->sf_next, idev));
2044 else
2045 rcu_assign_pointer(*ppsf,
2046 mc_dereference(psf->sf_next, idev));
2047 kfree_rcu(psf, rcu);
2048 } else {
2049 psf_prev = psf;
2050 }
2051 }
2052}
2053
2054/* called with mc_lock */
2055static void mld_send_cr(struct inet6_dev *idev)
2056{
2057 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2058 struct sk_buff *skb = NULL;
2059 int type, dtype;
2060
2061 /* deleted MCA's */
2062 pmc_prev = NULL;
2063 for (pmc = mc_dereference(idev->mc_tomb, idev);
2064 pmc;
2065 pmc = pmc_next) {
2066 pmc_next = mc_dereference(pmc->next, idev);
2067 if (pmc->mca_sfmode == MCAST_INCLUDE) {
2068 type = MLD2_BLOCK_OLD_SOURCES;
2069 dtype = MLD2_BLOCK_OLD_SOURCES;
2070 skb = add_grec(skb, pmc, type, 1, 0, 0);
2071 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
2072 }
2073 if (pmc->mca_crcount) {
2074 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2075 type = MLD2_CHANGE_TO_INCLUDE;
2076 skb = add_grec(skb, pmc, type, 1, 0, 0);
2077 }
2078 pmc->mca_crcount--;
2079 if (pmc->mca_crcount == 0) {
2080 mld_clear_zeros(&pmc->mca_tomb, idev);
2081 mld_clear_zeros(&pmc->mca_sources, idev);
2082 }
2083 }
2084 if (pmc->mca_crcount == 0 &&
2085 !rcu_access_pointer(pmc->mca_tomb) &&
2086 !rcu_access_pointer(pmc->mca_sources)) {
2087 if (pmc_prev)
2088 rcu_assign_pointer(pmc_prev->next, pmc_next);
2089 else
2090 rcu_assign_pointer(idev->mc_tomb, pmc_next);
2091 in6_dev_put(pmc->idev);
2092 kfree_rcu(pmc, rcu);
2093 } else
2094 pmc_prev = pmc;
2095 }
2096
2097 /* change recs */
2098 for_each_mc_mclock(idev, pmc) {
2099 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2100 type = MLD2_BLOCK_OLD_SOURCES;
2101 dtype = MLD2_ALLOW_NEW_SOURCES;
2102 } else {
2103 type = MLD2_ALLOW_NEW_SOURCES;
2104 dtype = MLD2_BLOCK_OLD_SOURCES;
2105 }
2106 skb = add_grec(skb, pmc, type, 0, 0, 0);
2107 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
2108
2109 /* filter mode changes */
2110 if (pmc->mca_crcount) {
2111 if (pmc->mca_sfmode == MCAST_EXCLUDE)
2112 type = MLD2_CHANGE_TO_EXCLUDE;
2113 else
2114 type = MLD2_CHANGE_TO_INCLUDE;
2115 skb = add_grec(skb, pmc, type, 0, 0, 0);
2116 pmc->mca_crcount--;
2117 }
2118 }
2119 if (!skb)
2120 return;
2121 (void) mld_sendpack(skb);
2122}
2123
2124static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2125{
2126 struct net *net = dev_net(dev);
2127 struct sock *sk = net->ipv6.igmp_sk;
2128 struct inet6_dev *idev;
2129 struct sk_buff *skb;
2130 struct mld_msg *hdr;
2131 const struct in6_addr *snd_addr, *saddr;
2132 struct in6_addr addr_buf;
2133 int hlen = LL_RESERVED_SPACE(dev);
2134 int tlen = dev->needed_tailroom;
2135 int err, len, payload_len, full_len;
2136 u8 ra[8] = { IPPROTO_ICMPV6, 0,
2137 IPV6_TLV_ROUTERALERT, 2, 0, 0,
2138 IPV6_TLV_PADN, 0 };
2139 struct flowi6 fl6;
2140 struct dst_entry *dst;
2141
2142 if (type == ICMPV6_MGM_REDUCTION)
2143 snd_addr = &in6addr_linklocal_allrouters;
2144 else
2145 snd_addr = addr;
2146
2147 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2148 payload_len = len + sizeof(ra);
2149 full_len = sizeof(struct ipv6hdr) + payload_len;
2150
2151 rcu_read_lock();
2152 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2153 IPSTATS_MIB_OUT, full_len);
2154 rcu_read_unlock();
2155
2156 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2157
2158 if (!skb) {
2159 rcu_read_lock();
2160 IP6_INC_STATS(net, __in6_dev_get(dev),
2161 IPSTATS_MIB_OUTDISCARDS);
2162 rcu_read_unlock();
2163 return;
2164 }
2165 skb->priority = TC_PRIO_CONTROL;
2166 skb_reserve(skb, hlen);
2167
2168 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2169 /* <draft-ietf-magma-mld-source-05.txt>:
2170 * use unspecified address as the source address
2171 * when a valid link-local address is not available.
2172 */
2173 saddr = &in6addr_any;
2174 } else
2175 saddr = &addr_buf;
2176
2177 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2178
2179 skb_put_data(skb, ra, sizeof(ra));
2180
2181 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2182 hdr->mld_type = type;
2183 hdr->mld_mca = *addr;
2184
2185 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2186 IPPROTO_ICMPV6,
2187 csum_partial(hdr, len, 0));
2188
2189 rcu_read_lock();
2190 idev = __in6_dev_get(skb->dev);
2191
2192 icmpv6_flow_init(sk, &fl6, type,
2193 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2194 skb->dev->ifindex);
2195 dst = icmp6_dst_alloc(skb->dev, &fl6);
2196 if (IS_ERR(dst)) {
2197 err = PTR_ERR(dst);
2198 goto err_out;
2199 }
2200
2201 skb_dst_set(skb, dst);
2202 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2203 net, sk, skb, NULL, skb->dev,
2204 dst_output);
2205out:
2206 if (!err) {
2207 ICMP6MSGOUT_INC_STATS(net, idev, type);
2208 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2209 } else
2210 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2211
2212 rcu_read_unlock();
2213 return;
2214
2215err_out:
2216 kfree_skb(skb);
2217 goto out;
2218}
2219
2220/* called with mc_lock */
2221static void mld_send_initial_cr(struct inet6_dev *idev)
2222{
2223 struct sk_buff *skb;
2224 struct ifmcaddr6 *pmc;
2225 int type;
2226
2227 if (mld_in_v1_mode(idev))
2228 return;
2229
2230 skb = NULL;
2231 for_each_mc_mclock(idev, pmc) {
2232 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2233 type = MLD2_CHANGE_TO_EXCLUDE;
2234 else
2235 type = MLD2_ALLOW_NEW_SOURCES;
2236 skb = add_grec(skb, pmc, type, 0, 0, 1);
2237 }
2238 if (skb)
2239 mld_sendpack(skb);
2240}
2241
2242void ipv6_mc_dad_complete(struct inet6_dev *idev)
2243{
2244 mutex_lock(&idev->mc_lock);
2245 idev->mc_dad_count = idev->mc_qrv;
2246 if (idev->mc_dad_count) {
2247 mld_send_initial_cr(idev);
2248 idev->mc_dad_count--;
2249 if (idev->mc_dad_count)
2250 mld_dad_start_work(idev,
2251 unsolicited_report_interval(idev));
2252 }
2253 mutex_unlock(&idev->mc_lock);
2254}
2255
2256static void mld_dad_work(struct work_struct *work)
2257{
2258 struct inet6_dev *idev = container_of(to_delayed_work(work),
2259 struct inet6_dev,
2260 mc_dad_work);
2261 mutex_lock(&idev->mc_lock);
2262 mld_send_initial_cr(idev);
2263 if (idev->mc_dad_count) {
2264 idev->mc_dad_count--;
2265 if (idev->mc_dad_count)
2266 mld_dad_start_work(idev,
2267 unsolicited_report_interval(idev));
2268 }
2269 mutex_unlock(&idev->mc_lock);
2270 in6_dev_put(idev);
2271}
2272
2273/* called with mc_lock */
2274static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2275 const struct in6_addr *psfsrc)
2276{
2277 struct ip6_sf_list *psf, *psf_prev;
2278 int rv = 0;
2279
2280 psf_prev = NULL;
2281 for_each_psf_mclock(pmc, psf) {
2282 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2283 break;
2284 psf_prev = psf;
2285 }
2286 if (!psf || psf->sf_count[sfmode] == 0) {
2287 /* source filter not found, or count wrong => bug */
2288 return -ESRCH;
2289 }
2290 psf->sf_count[sfmode]--;
2291 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2292 struct inet6_dev *idev = pmc->idev;
2293
2294 /* no more filters for this source */
2295 if (psf_prev)
2296 rcu_assign_pointer(psf_prev->sf_next,
2297 mc_dereference(psf->sf_next, idev));
2298 else
2299 rcu_assign_pointer(pmc->mca_sources,
2300 mc_dereference(psf->sf_next, idev));
2301
2302 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2303 !mld_in_v1_mode(idev)) {
2304 psf->sf_crcount = idev->mc_qrv;
2305 rcu_assign_pointer(psf->sf_next,
2306 mc_dereference(pmc->mca_tomb, idev));
2307 rcu_assign_pointer(pmc->mca_tomb, psf);
2308 rv = 1;
2309 } else {
2310 kfree_rcu(psf, rcu);
2311 }
2312 }
2313 return rv;
2314}
2315
2316/* called with mc_lock */
2317static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2318 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2319 int delta)
2320{
2321 struct ifmcaddr6 *pmc;
2322 int changerec = 0;
2323 int i, err;
2324
2325 if (!idev)
2326 return -ENODEV;
2327
2328 for_each_mc_mclock(idev, pmc) {
2329 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2330 break;
2331 }
2332 if (!pmc)
2333 return -ESRCH;
2334
2335 sf_markstate(pmc);
2336 if (!delta) {
2337 if (!pmc->mca_sfcount[sfmode])
2338 return -EINVAL;
2339
2340 pmc->mca_sfcount[sfmode]--;
2341 }
2342 err = 0;
2343 for (i = 0; i < sfcount; i++) {
2344 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2345
2346 changerec |= rv > 0;
2347 if (!err && rv < 0)
2348 err = rv;
2349 }
2350 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2351 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2352 pmc->mca_sfcount[MCAST_INCLUDE]) {
2353 struct ip6_sf_list *psf;
2354
2355 /* filter mode change */
2356 pmc->mca_sfmode = MCAST_INCLUDE;
2357 pmc->mca_crcount = idev->mc_qrv;
2358 idev->mc_ifc_count = pmc->mca_crcount;
2359 for_each_psf_mclock(pmc, psf)
2360 psf->sf_crcount = 0;
2361 mld_ifc_event(pmc->idev);
2362 } else if (sf_setstate(pmc) || changerec) {
2363 mld_ifc_event(pmc->idev);
2364 }
2365
2366 return err;
2367}
2368
2369/*
2370 * Add multicast single-source filter to the interface list
2371 * called with mc_lock
2372 */
2373static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2374 const struct in6_addr *psfsrc)
2375{
2376 struct ip6_sf_list *psf, *psf_prev;
2377
2378 psf_prev = NULL;
2379 for_each_psf_mclock(pmc, psf) {
2380 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2381 break;
2382 psf_prev = psf;
2383 }
2384 if (!psf) {
2385 psf = kzalloc(sizeof(*psf), GFP_KERNEL);
2386 if (!psf)
2387 return -ENOBUFS;
2388
2389 psf->sf_addr = *psfsrc;
2390 if (psf_prev) {
2391 rcu_assign_pointer(psf_prev->sf_next, psf);
2392 } else {
2393 rcu_assign_pointer(pmc->mca_sources, psf);
2394 }
2395 }
2396 psf->sf_count[sfmode]++;
2397 return 0;
2398}
2399
2400/* called with mc_lock */
2401static void sf_markstate(struct ifmcaddr6 *pmc)
2402{
2403 struct ip6_sf_list *psf;
2404 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2405
2406 for_each_psf_mclock(pmc, psf) {
2407 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2408 psf->sf_oldin = mca_xcount ==
2409 psf->sf_count[MCAST_EXCLUDE] &&
2410 !psf->sf_count[MCAST_INCLUDE];
2411 } else {
2412 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2413 }
2414 }
2415}
2416
2417/* called with mc_lock */
2418static int sf_setstate(struct ifmcaddr6 *pmc)
2419{
2420 struct ip6_sf_list *psf, *dpsf;
2421 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2422 int qrv = pmc->idev->mc_qrv;
2423 int new_in, rv;
2424
2425 rv = 0;
2426 for_each_psf_mclock(pmc, psf) {
2427 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2428 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2429 !psf->sf_count[MCAST_INCLUDE];
2430 } else
2431 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2432 if (new_in) {
2433 if (!psf->sf_oldin) {
2434 struct ip6_sf_list *prev = NULL;
2435
2436 for_each_psf_tomb(pmc, dpsf) {
2437 if (ipv6_addr_equal(&dpsf->sf_addr,
2438 &psf->sf_addr))
2439 break;
2440 prev = dpsf;
2441 }
2442 if (dpsf) {
2443 if (prev)
2444 rcu_assign_pointer(prev->sf_next,
2445 mc_dereference(dpsf->sf_next,
2446 pmc->idev));
2447 else
2448 rcu_assign_pointer(pmc->mca_tomb,
2449 mc_dereference(dpsf->sf_next,
2450 pmc->idev));
2451 kfree_rcu(dpsf, rcu);
2452 }
2453 psf->sf_crcount = qrv;
2454 rv++;
2455 }
2456 } else if (psf->sf_oldin) {
2457 psf->sf_crcount = 0;
2458 /*
2459 * add or update "delete" records if an active filter
2460 * is now inactive
2461 */
2462
2463 for_each_psf_tomb(pmc, dpsf)
2464 if (ipv6_addr_equal(&dpsf->sf_addr,
2465 &psf->sf_addr))
2466 break;
2467 if (!dpsf) {
2468 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL);
2469 if (!dpsf)
2470 continue;
2471 *dpsf = *psf;
2472 rcu_assign_pointer(dpsf->sf_next,
2473 mc_dereference(pmc->mca_tomb, pmc->idev));
2474 rcu_assign_pointer(pmc->mca_tomb, dpsf);
2475 }
2476 dpsf->sf_crcount = qrv;
2477 rv++;
2478 }
2479 }
2480 return rv;
2481}
2482
2483/*
2484 * Add multicast source filter list to the interface list
2485 * called with mc_lock
2486 */
2487static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2488 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2489 int delta)
2490{
2491 struct ifmcaddr6 *pmc;
2492 int isexclude;
2493 int i, err;
2494
2495 if (!idev)
2496 return -ENODEV;
2497
2498 for_each_mc_mclock(idev, pmc) {
2499 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2500 break;
2501 }
2502 if (!pmc)
2503 return -ESRCH;
2504
2505 sf_markstate(pmc);
2506 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2507 if (!delta)
2508 pmc->mca_sfcount[sfmode]++;
2509 err = 0;
2510 for (i = 0; i < sfcount; i++) {
2511 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2512 if (err)
2513 break;
2514 }
2515 if (err) {
2516 int j;
2517
2518 if (!delta)
2519 pmc->mca_sfcount[sfmode]--;
2520 for (j = 0; j < i; j++)
2521 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2522 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2523 struct ip6_sf_list *psf;
2524
2525 /* filter mode change */
2526 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2527 pmc->mca_sfmode = MCAST_EXCLUDE;
2528 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2529 pmc->mca_sfmode = MCAST_INCLUDE;
2530 /* else no filters; keep old mode for reports */
2531
2532 pmc->mca_crcount = idev->mc_qrv;
2533 idev->mc_ifc_count = pmc->mca_crcount;
2534 for_each_psf_mclock(pmc, psf)
2535 psf->sf_crcount = 0;
2536 mld_ifc_event(idev);
2537 } else if (sf_setstate(pmc)) {
2538 mld_ifc_event(idev);
2539 }
2540 return err;
2541}
2542
2543/* called with mc_lock */
2544static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2545{
2546 struct ip6_sf_list *psf, *nextpsf;
2547
2548 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev);
2549 psf;
2550 psf = nextpsf) {
2551 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2552 kfree_rcu(psf, rcu);
2553 }
2554 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
2555 for (psf = mc_dereference(pmc->mca_sources, pmc->idev);
2556 psf;
2557 psf = nextpsf) {
2558 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2559 kfree_rcu(psf, rcu);
2560 }
2561 RCU_INIT_POINTER(pmc->mca_sources, NULL);
2562 pmc->mca_sfmode = MCAST_EXCLUDE;
2563 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2564 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2565}
2566
2567/* called with mc_lock */
2568static void igmp6_join_group(struct ifmcaddr6 *ma)
2569{
2570 unsigned long delay;
2571
2572 if (ma->mca_flags & MAF_NOREPORT)
2573 return;
2574
2575 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2576
2577 delay = get_random_u32_below(unsolicited_report_interval(ma->idev));
2578
2579 if (cancel_delayed_work(&ma->mca_work)) {
2580 refcount_dec(&ma->mca_refcnt);
2581 delay = ma->mca_work.timer.expires - jiffies;
2582 }
2583
2584 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
2585 refcount_inc(&ma->mca_refcnt);
2586 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2587}
2588
2589static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2590 struct inet6_dev *idev)
2591{
2592 struct ip6_sf_socklist *psl;
2593 int err;
2594
2595 psl = sock_dereference(iml->sflist, sk);
2596
2597 if (idev)
2598 mutex_lock(&idev->mc_lock);
2599
2600 if (!psl) {
2601 /* any-source empty exclude case */
2602 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2603 } else {
2604 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2605 psl->sl_count, psl->sl_addr, 0);
2606 RCU_INIT_POINTER(iml->sflist, NULL);
2607 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2608 &sk->sk_omem_alloc);
2609 kfree_rcu(psl, rcu);
2610 }
2611
2612 if (idev)
2613 mutex_unlock(&idev->mc_lock);
2614
2615 return err;
2616}
2617
2618/* called with mc_lock */
2619static void igmp6_leave_group(struct ifmcaddr6 *ma)
2620{
2621 if (mld_in_v1_mode(ma->idev)) {
2622 if (ma->mca_flags & MAF_LAST_REPORTER) {
2623 igmp6_send(&ma->mca_addr, ma->idev->dev,
2624 ICMPV6_MGM_REDUCTION);
2625 }
2626 } else {
2627 mld_add_delrec(ma->idev, ma);
2628 mld_ifc_event(ma->idev);
2629 }
2630}
2631
2632static void mld_gq_work(struct work_struct *work)
2633{
2634 struct inet6_dev *idev = container_of(to_delayed_work(work),
2635 struct inet6_dev,
2636 mc_gq_work);
2637
2638 mutex_lock(&idev->mc_lock);
2639 mld_send_report(idev, NULL);
2640 idev->mc_gq_running = 0;
2641 mutex_unlock(&idev->mc_lock);
2642
2643 in6_dev_put(idev);
2644}
2645
2646static void mld_ifc_work(struct work_struct *work)
2647{
2648 struct inet6_dev *idev = container_of(to_delayed_work(work),
2649 struct inet6_dev,
2650 mc_ifc_work);
2651
2652 mutex_lock(&idev->mc_lock);
2653 mld_send_cr(idev);
2654
2655 if (idev->mc_ifc_count) {
2656 idev->mc_ifc_count--;
2657 if (idev->mc_ifc_count)
2658 mld_ifc_start_work(idev,
2659 unsolicited_report_interval(idev));
2660 }
2661 mutex_unlock(&idev->mc_lock);
2662 in6_dev_put(idev);
2663}
2664
2665/* called with mc_lock */
2666static void mld_ifc_event(struct inet6_dev *idev)
2667{
2668 if (mld_in_v1_mode(idev))
2669 return;
2670
2671 idev->mc_ifc_count = idev->mc_qrv;
2672 mld_ifc_start_work(idev, 1);
2673}
2674
2675static void mld_mca_work(struct work_struct *work)
2676{
2677 struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2678 struct ifmcaddr6, mca_work);
2679
2680 mutex_lock(&ma->idev->mc_lock);
2681 if (mld_in_v1_mode(ma->idev))
2682 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2683 else
2684 mld_send_report(ma->idev, ma);
2685 ma->mca_flags |= MAF_LAST_REPORTER;
2686 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2687 mutex_unlock(&ma->idev->mc_lock);
2688
2689 ma_put(ma);
2690}
2691
2692/* Device changing type */
2693
2694void ipv6_mc_unmap(struct inet6_dev *idev)
2695{
2696 struct ifmcaddr6 *i;
2697
2698 /* Install multicast list, except for all-nodes (already installed) */
2699
2700 mutex_lock(&idev->mc_lock);
2701 for_each_mc_mclock(idev, i)
2702 igmp6_group_dropped(i);
2703 mutex_unlock(&idev->mc_lock);
2704}
2705
2706void ipv6_mc_remap(struct inet6_dev *idev)
2707{
2708 ipv6_mc_up(idev);
2709}
2710
2711/* Device going down */
2712void ipv6_mc_down(struct inet6_dev *idev)
2713{
2714 struct ifmcaddr6 *i;
2715
2716 mutex_lock(&idev->mc_lock);
2717 /* Withdraw multicast list */
2718 for_each_mc_mclock(idev, i)
2719 igmp6_group_dropped(i);
2720 mutex_unlock(&idev->mc_lock);
2721
2722 /* Should stop work after group drop. or we will
2723 * start work again in mld_ifc_event()
2724 */
2725 synchronize_net();
2726 mld_query_stop_work(idev);
2727 mld_report_stop_work(idev);
2728 mld_ifc_stop_work(idev);
2729 mld_gq_stop_work(idev);
2730 mld_dad_stop_work(idev);
2731}
2732
2733static void ipv6_mc_reset(struct inet6_dev *idev)
2734{
2735 idev->mc_qrv = sysctl_mld_qrv;
2736 idev->mc_qi = MLD_QI_DEFAULT;
2737 idev->mc_qri = MLD_QRI_DEFAULT;
2738 idev->mc_v1_seen = 0;
2739 idev->mc_maxdelay = unsolicited_report_interval(idev);
2740}
2741
2742/* Device going up */
2743
2744void ipv6_mc_up(struct inet6_dev *idev)
2745{
2746 struct ifmcaddr6 *i;
2747
2748 /* Install multicast list, except for all-nodes (already installed) */
2749
2750 ipv6_mc_reset(idev);
2751 mutex_lock(&idev->mc_lock);
2752 for_each_mc_mclock(idev, i) {
2753 mld_del_delrec(idev, i);
2754 igmp6_group_added(i);
2755 }
2756 mutex_unlock(&idev->mc_lock);
2757}
2758
2759/* IPv6 device initialization. */
2760
2761void ipv6_mc_init_dev(struct inet6_dev *idev)
2762{
2763 idev->mc_gq_running = 0;
2764 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work);
2765 RCU_INIT_POINTER(idev->mc_tomb, NULL);
2766 idev->mc_ifc_count = 0;
2767 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work);
2768 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work);
2769 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work);
2770 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work);
2771 skb_queue_head_init(&idev->mc_query_queue);
2772 skb_queue_head_init(&idev->mc_report_queue);
2773 spin_lock_init(&idev->mc_query_lock);
2774 spin_lock_init(&idev->mc_report_lock);
2775 mutex_init(&idev->mc_lock);
2776 ipv6_mc_reset(idev);
2777}
2778
2779/*
2780 * Device is about to be destroyed: clean up.
2781 */
2782
2783void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2784{
2785 struct ifmcaddr6 *i;
2786
2787 /* Deactivate works */
2788 ipv6_mc_down(idev);
2789 mutex_lock(&idev->mc_lock);
2790 mld_clear_delrec(idev);
2791 mutex_unlock(&idev->mc_lock);
2792 mld_clear_query(idev);
2793 mld_clear_report(idev);
2794
2795 /* Delete all-nodes address. */
2796 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2797 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2798 * fail.
2799 */
2800 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2801
2802 if (idev->cnf.forwarding)
2803 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2804
2805 mutex_lock(&idev->mc_lock);
2806 while ((i = mc_dereference(idev->mc_list, idev))) {
2807 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev));
2808
2809 ip6_mc_clear_src(i);
2810 ma_put(i);
2811 }
2812 mutex_unlock(&idev->mc_lock);
2813}
2814
2815static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2816{
2817 struct ifmcaddr6 *pmc;
2818
2819 ASSERT_RTNL();
2820
2821 mutex_lock(&idev->mc_lock);
2822 if (mld_in_v1_mode(idev)) {
2823 for_each_mc_mclock(idev, pmc)
2824 igmp6_join_group(pmc);
2825 } else {
2826 mld_send_report(idev, NULL);
2827 }
2828 mutex_unlock(&idev->mc_lock);
2829}
2830
2831static int ipv6_mc_netdev_event(struct notifier_block *this,
2832 unsigned long event,
2833 void *ptr)
2834{
2835 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2836 struct inet6_dev *idev = __in6_dev_get(dev);
2837
2838 switch (event) {
2839 case NETDEV_RESEND_IGMP:
2840 if (idev)
2841 ipv6_mc_rejoin_groups(idev);
2842 break;
2843 default:
2844 break;
2845 }
2846
2847 return NOTIFY_DONE;
2848}
2849
2850static struct notifier_block igmp6_netdev_notifier = {
2851 .notifier_call = ipv6_mc_netdev_event,
2852};
2853
2854#ifdef CONFIG_PROC_FS
2855struct igmp6_mc_iter_state {
2856 struct seq_net_private p;
2857 struct net_device *dev;
2858 struct inet6_dev *idev;
2859};
2860
2861#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2862
2863static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2864{
2865 struct ifmcaddr6 *im = NULL;
2866 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2867 struct net *net = seq_file_net(seq);
2868
2869 state->idev = NULL;
2870 for_each_netdev_rcu(net, state->dev) {
2871 struct inet6_dev *idev;
2872 idev = __in6_dev_get(state->dev);
2873 if (!idev)
2874 continue;
2875
2876 im = rcu_dereference(idev->mc_list);
2877 if (im) {
2878 state->idev = idev;
2879 break;
2880 }
2881 }
2882 return im;
2883}
2884
2885static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2886{
2887 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2888
2889 im = rcu_dereference(im->next);
2890 while (!im) {
2891 state->dev = next_net_device_rcu(state->dev);
2892 if (!state->dev) {
2893 state->idev = NULL;
2894 break;
2895 }
2896 state->idev = __in6_dev_get(state->dev);
2897 if (!state->idev)
2898 continue;
2899 im = rcu_dereference(state->idev->mc_list);
2900 }
2901 return im;
2902}
2903
2904static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2905{
2906 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2907 if (im)
2908 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2909 --pos;
2910 return pos ? NULL : im;
2911}
2912
2913static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2914 __acquires(RCU)
2915{
2916 rcu_read_lock();
2917 return igmp6_mc_get_idx(seq, *pos);
2918}
2919
2920static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2921{
2922 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2923
2924 ++*pos;
2925 return im;
2926}
2927
2928static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2929 __releases(RCU)
2930{
2931 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2932
2933 if (likely(state->idev))
2934 state->idev = NULL;
2935 state->dev = NULL;
2936 rcu_read_unlock();
2937}
2938
2939static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2940{
2941 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2942 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2943
2944 seq_printf(seq,
2945 "%-4d %-15s %pi6 %5d %08X %ld\n",
2946 state->dev->ifindex, state->dev->name,
2947 &im->mca_addr,
2948 im->mca_users, im->mca_flags,
2949 (im->mca_flags & MAF_TIMER_RUNNING) ?
2950 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0);
2951 return 0;
2952}
2953
2954static const struct seq_operations igmp6_mc_seq_ops = {
2955 .start = igmp6_mc_seq_start,
2956 .next = igmp6_mc_seq_next,
2957 .stop = igmp6_mc_seq_stop,
2958 .show = igmp6_mc_seq_show,
2959};
2960
2961struct igmp6_mcf_iter_state {
2962 struct seq_net_private p;
2963 struct net_device *dev;
2964 struct inet6_dev *idev;
2965 struct ifmcaddr6 *im;
2966};
2967
2968#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2969
2970static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2971{
2972 struct ip6_sf_list *psf = NULL;
2973 struct ifmcaddr6 *im = NULL;
2974 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2975 struct net *net = seq_file_net(seq);
2976
2977 state->idev = NULL;
2978 state->im = NULL;
2979 for_each_netdev_rcu(net, state->dev) {
2980 struct inet6_dev *idev;
2981 idev = __in6_dev_get(state->dev);
2982 if (unlikely(idev == NULL))
2983 continue;
2984
2985 im = rcu_dereference(idev->mc_list);
2986 if (likely(im)) {
2987 psf = rcu_dereference(im->mca_sources);
2988 if (likely(psf)) {
2989 state->im = im;
2990 state->idev = idev;
2991 break;
2992 }
2993 }
2994 }
2995 return psf;
2996}
2997
2998static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2999{
3000 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3001
3002 psf = rcu_dereference(psf->sf_next);
3003 while (!psf) {
3004 state->im = rcu_dereference(state->im->next);
3005 while (!state->im) {
3006 state->dev = next_net_device_rcu(state->dev);
3007 if (!state->dev) {
3008 state->idev = NULL;
3009 goto out;
3010 }
3011 state->idev = __in6_dev_get(state->dev);
3012 if (!state->idev)
3013 continue;
3014 state->im = rcu_dereference(state->idev->mc_list);
3015 }
3016 if (!state->im)
3017 break;
3018 psf = rcu_dereference(state->im->mca_sources);
3019 }
3020out:
3021 return psf;
3022}
3023
3024static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3025{
3026 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3027 if (psf)
3028 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3029 --pos;
3030 return pos ? NULL : psf;
3031}
3032
3033static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3034 __acquires(RCU)
3035{
3036 rcu_read_lock();
3037 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3038}
3039
3040static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3041{
3042 struct ip6_sf_list *psf;
3043 if (v == SEQ_START_TOKEN)
3044 psf = igmp6_mcf_get_first(seq);
3045 else
3046 psf = igmp6_mcf_get_next(seq, v);
3047 ++*pos;
3048 return psf;
3049}
3050
3051static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
3052 __releases(RCU)
3053{
3054 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3055
3056 if (likely(state->im))
3057 state->im = NULL;
3058 if (likely(state->idev))
3059 state->idev = NULL;
3060
3061 state->dev = NULL;
3062 rcu_read_unlock();
3063}
3064
3065static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3066{
3067 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3068 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3069
3070 if (v == SEQ_START_TOKEN) {
3071 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
3072 } else {
3073 seq_printf(seq,
3074 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
3075 state->dev->ifindex, state->dev->name,
3076 &state->im->mca_addr,
3077 &psf->sf_addr,
3078 psf->sf_count[MCAST_INCLUDE],
3079 psf->sf_count[MCAST_EXCLUDE]);
3080 }
3081 return 0;
3082}
3083
3084static const struct seq_operations igmp6_mcf_seq_ops = {
3085 .start = igmp6_mcf_seq_start,
3086 .next = igmp6_mcf_seq_next,
3087 .stop = igmp6_mcf_seq_stop,
3088 .show = igmp6_mcf_seq_show,
3089};
3090
3091static int __net_init igmp6_proc_init(struct net *net)
3092{
3093 int err;
3094
3095 err = -ENOMEM;
3096 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3097 sizeof(struct igmp6_mc_iter_state)))
3098 goto out;
3099 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3100 &igmp6_mcf_seq_ops,
3101 sizeof(struct igmp6_mcf_iter_state)))
3102 goto out_proc_net_igmp6;
3103
3104 err = 0;
3105out:
3106 return err;
3107
3108out_proc_net_igmp6:
3109 remove_proc_entry("igmp6", net->proc_net);
3110 goto out;
3111}
3112
3113static void __net_exit igmp6_proc_exit(struct net *net)
3114{
3115 remove_proc_entry("mcfilter6", net->proc_net);
3116 remove_proc_entry("igmp6", net->proc_net);
3117}
3118#else
3119static inline int igmp6_proc_init(struct net *net)
3120{
3121 return 0;
3122}
3123static inline void igmp6_proc_exit(struct net *net)
3124{
3125}
3126#endif
3127
3128static int __net_init igmp6_net_init(struct net *net)
3129{
3130 int err;
3131
3132 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3133 SOCK_RAW, IPPROTO_ICMPV6, net);
3134 if (err < 0) {
3135 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
3136 err);
3137 goto out;
3138 }
3139
3140 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
3141 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
3142
3143 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3144 SOCK_RAW, IPPROTO_ICMPV6, net);
3145 if (err < 0) {
3146 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3147 err);
3148 goto out_sock_create;
3149 }
3150
3151 err = igmp6_proc_init(net);
3152 if (err)
3153 goto out_sock_create_autojoin;
3154
3155 return 0;
3156
3157out_sock_create_autojoin:
3158 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3159out_sock_create:
3160 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3161out:
3162 return err;
3163}
3164
3165static void __net_exit igmp6_net_exit(struct net *net)
3166{
3167 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3168 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3169 igmp6_proc_exit(net);
3170}
3171
3172static struct pernet_operations igmp6_net_ops = {
3173 .init = igmp6_net_init,
3174 .exit = igmp6_net_exit,
3175};
3176
3177int __init igmp6_init(void)
3178{
3179 int err;
3180
3181 err = register_pernet_subsys(&igmp6_net_ops);
3182 if (err)
3183 return err;
3184
3185 mld_wq = create_workqueue("mld");
3186 if (!mld_wq) {
3187 unregister_pernet_subsys(&igmp6_net_ops);
3188 return -ENOMEM;
3189 }
3190
3191 return err;
3192}
3193
3194int __init igmp6_late_init(void)
3195{
3196 return register_netdevice_notifier(&igmp6_netdev_notifier);
3197}
3198
3199void igmp6_cleanup(void)
3200{
3201 unregister_pernet_subsys(&igmp6_net_ops);
3202 destroy_workqueue(mld_wq);
3203}
3204
3205void igmp6_late_cleanup(void)
3206{
3207 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3208}
1/*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16/* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29#include <linux/module.h>
30#include <linux/errno.h>
31#include <linux/types.h>
32#include <linux/string.h>
33#include <linux/socket.h>
34#include <linux/sockios.h>
35#include <linux/jiffies.h>
36#include <linux/times.h>
37#include <linux/net.h>
38#include <linux/in.h>
39#include <linux/in6.h>
40#include <linux/netdevice.h>
41#include <linux/if_arp.h>
42#include <linux/route.h>
43#include <linux/init.h>
44#include <linux/proc_fs.h>
45#include <linux/seq_file.h>
46#include <linux/slab.h>
47#include <linux/pkt_sched.h>
48#include <net/mld.h>
49
50#include <linux/netfilter.h>
51#include <linux/netfilter_ipv6.h>
52
53#include <net/net_namespace.h>
54#include <net/sock.h>
55#include <net/snmp.h>
56
57#include <net/ipv6.h>
58#include <net/protocol.h>
59#include <net/if_inet6.h>
60#include <net/ndisc.h>
61#include <net/addrconf.h>
62#include <net/ip6_route.h>
63#include <net/inet_common.h>
64
65#include <net/ip6_checksum.h>
66
67/* Ensure that we have struct in6_addr aligned on 32bit word. */
68static int __mld2_query_bugs[] __attribute__((__unused__)) = {
69 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
70 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
71 BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
72};
73
74static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
75
76static void igmp6_join_group(struct ifmcaddr6 *ma);
77static void igmp6_leave_group(struct ifmcaddr6 *ma);
78static void igmp6_timer_handler(struct timer_list *t);
79
80static void mld_gq_timer_expire(struct timer_list *t);
81static void mld_ifc_timer_expire(struct timer_list *t);
82static void mld_ifc_event(struct inet6_dev *idev);
83static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
84static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
85static void mld_clear_delrec(struct inet6_dev *idev);
86static bool mld_in_v1_mode(const struct inet6_dev *idev);
87static int sf_setstate(struct ifmcaddr6 *pmc);
88static void sf_markstate(struct ifmcaddr6 *pmc);
89static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
90static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
91 int sfmode, int sfcount, const struct in6_addr *psfsrc,
92 int delta);
93static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
94 int sfmode, int sfcount, const struct in6_addr *psfsrc,
95 int delta);
96static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
97 struct inet6_dev *idev);
98
99#define MLD_QRV_DEFAULT 2
100/* RFC3810, 9.2. Query Interval */
101#define MLD_QI_DEFAULT (125 * HZ)
102/* RFC3810, 9.3. Query Response Interval */
103#define MLD_QRI_DEFAULT (10 * HZ)
104
105/* RFC3810, 8.1 Query Version Distinctions */
106#define MLD_V1_QUERY_LEN 24
107#define MLD_V2_QUERY_LEN_MIN 28
108
109#define IPV6_MLD_MAX_MSF 64
110
111int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
112int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
113
114/*
115 * socket join on multicast group
116 */
117
118#define for_each_pmc_rcu(np, pmc) \
119 for (pmc = rcu_dereference(np->ipv6_mc_list); \
120 pmc != NULL; \
121 pmc = rcu_dereference(pmc->next))
122
123static int unsolicited_report_interval(struct inet6_dev *idev)
124{
125 int iv;
126
127 if (mld_in_v1_mode(idev))
128 iv = idev->cnf.mldv1_unsolicited_report_interval;
129 else
130 iv = idev->cnf.mldv2_unsolicited_report_interval;
131
132 return iv > 0 ? iv : 1;
133}
134
135int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
136{
137 struct net_device *dev = NULL;
138 struct ipv6_mc_socklist *mc_lst;
139 struct ipv6_pinfo *np = inet6_sk(sk);
140 struct net *net = sock_net(sk);
141 int err;
142
143 ASSERT_RTNL();
144
145 if (!ipv6_addr_is_multicast(addr))
146 return -EINVAL;
147
148 rcu_read_lock();
149 for_each_pmc_rcu(np, mc_lst) {
150 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
151 ipv6_addr_equal(&mc_lst->addr, addr)) {
152 rcu_read_unlock();
153 return -EADDRINUSE;
154 }
155 }
156 rcu_read_unlock();
157
158 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
159
160 if (!mc_lst)
161 return -ENOMEM;
162
163 mc_lst->next = NULL;
164 mc_lst->addr = *addr;
165
166 if (ifindex == 0) {
167 struct rt6_info *rt;
168 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
169 if (rt) {
170 dev = rt->dst.dev;
171 ip6_rt_put(rt);
172 }
173 } else
174 dev = __dev_get_by_index(net, ifindex);
175
176 if (!dev) {
177 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
178 return -ENODEV;
179 }
180
181 mc_lst->ifindex = dev->ifindex;
182 mc_lst->sfmode = MCAST_EXCLUDE;
183 rwlock_init(&mc_lst->sflock);
184 mc_lst->sflist = NULL;
185
186 /*
187 * now add/increase the group membership on the device
188 */
189
190 err = ipv6_dev_mc_inc(dev, addr);
191
192 if (err) {
193 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
194 return err;
195 }
196
197 mc_lst->next = np->ipv6_mc_list;
198 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
199
200 return 0;
201}
202EXPORT_SYMBOL(ipv6_sock_mc_join);
203
204/*
205 * socket leave on multicast group
206 */
207int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
208{
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct ipv6_mc_socklist *mc_lst;
211 struct ipv6_mc_socklist __rcu **lnk;
212 struct net *net = sock_net(sk);
213
214 ASSERT_RTNL();
215
216 if (!ipv6_addr_is_multicast(addr))
217 return -EINVAL;
218
219 for (lnk = &np->ipv6_mc_list;
220 (mc_lst = rtnl_dereference(*lnk)) != NULL;
221 lnk = &mc_lst->next) {
222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223 ipv6_addr_equal(&mc_lst->addr, addr)) {
224 struct net_device *dev;
225
226 *lnk = mc_lst->next;
227
228 dev = __dev_get_by_index(net, mc_lst->ifindex);
229 if (dev) {
230 struct inet6_dev *idev = __in6_dev_get(dev);
231
232 (void) ip6_mc_leave_src(sk, mc_lst, idev);
233 if (idev)
234 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
235 } else
236 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
237
238 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
239 kfree_rcu(mc_lst, rcu);
240 return 0;
241 }
242 }
243
244 return -EADDRNOTAVAIL;
245}
246EXPORT_SYMBOL(ipv6_sock_mc_drop);
247
248/* called with rcu_read_lock() */
249static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
250 const struct in6_addr *group,
251 int ifindex)
252{
253 struct net_device *dev = NULL;
254 struct inet6_dev *idev = NULL;
255
256 if (ifindex == 0) {
257 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
258
259 if (rt) {
260 dev = rt->dst.dev;
261 ip6_rt_put(rt);
262 }
263 } else
264 dev = dev_get_by_index_rcu(net, ifindex);
265
266 if (!dev)
267 return NULL;
268 idev = __in6_dev_get(dev);
269 if (!idev)
270 return NULL;
271 read_lock_bh(&idev->lock);
272 if (idev->dead) {
273 read_unlock_bh(&idev->lock);
274 return NULL;
275 }
276 return idev;
277}
278
279void __ipv6_sock_mc_close(struct sock *sk)
280{
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct ipv6_mc_socklist *mc_lst;
283 struct net *net = sock_net(sk);
284
285 ASSERT_RTNL();
286
287 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
288 struct net_device *dev;
289
290 np->ipv6_mc_list = mc_lst->next;
291
292 dev = __dev_get_by_index(net, mc_lst->ifindex);
293 if (dev) {
294 struct inet6_dev *idev = __in6_dev_get(dev);
295
296 (void) ip6_mc_leave_src(sk, mc_lst, idev);
297 if (idev)
298 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
299 } else
300 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
301
302 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
303 kfree_rcu(mc_lst, rcu);
304 }
305}
306
307void ipv6_sock_mc_close(struct sock *sk)
308{
309 struct ipv6_pinfo *np = inet6_sk(sk);
310
311 if (!rcu_access_pointer(np->ipv6_mc_list))
312 return;
313 rtnl_lock();
314 __ipv6_sock_mc_close(sk);
315 rtnl_unlock();
316}
317
318int ip6_mc_source(int add, int omode, struct sock *sk,
319 struct group_source_req *pgsr)
320{
321 struct in6_addr *source, *group;
322 struct ipv6_mc_socklist *pmc;
323 struct inet6_dev *idev;
324 struct ipv6_pinfo *inet6 = inet6_sk(sk);
325 struct ip6_sf_socklist *psl;
326 struct net *net = sock_net(sk);
327 int i, j, rv;
328 int leavegroup = 0;
329 int pmclocked = 0;
330 int err;
331
332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
334
335 if (!ipv6_addr_is_multicast(group))
336 return -EINVAL;
337
338 rcu_read_lock();
339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
340 if (!idev) {
341 rcu_read_unlock();
342 return -ENODEV;
343 }
344
345 err = -EADDRNOTAVAIL;
346
347 for_each_pmc_rcu(inet6, pmc) {
348 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
349 continue;
350 if (ipv6_addr_equal(&pmc->addr, group))
351 break;
352 }
353 if (!pmc) { /* must have a prior join */
354 err = -EINVAL;
355 goto done;
356 }
357 /* if a source filter was set, must be the same mode as before */
358 if (pmc->sflist) {
359 if (pmc->sfmode != omode) {
360 err = -EINVAL;
361 goto done;
362 }
363 } else if (pmc->sfmode != omode) {
364 /* allow mode switches for empty-set filters */
365 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
366 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
367 pmc->sfmode = omode;
368 }
369
370 write_lock(&pmc->sflock);
371 pmclocked = 1;
372
373 psl = pmc->sflist;
374 if (!add) {
375 if (!psl)
376 goto done; /* err = -EADDRNOTAVAIL */
377 rv = !0;
378 for (i = 0; i < psl->sl_count; i++) {
379 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
380 if (rv == 0)
381 break;
382 }
383 if (rv) /* source not found */
384 goto done; /* err = -EADDRNOTAVAIL */
385
386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
388 leavegroup = 1;
389 goto done;
390 }
391
392 /* update the interface filter */
393 ip6_mc_del_src(idev, group, omode, 1, source, 1);
394
395 for (j = i+1; j < psl->sl_count; j++)
396 psl->sl_addr[j-1] = psl->sl_addr[j];
397 psl->sl_count--;
398 err = 0;
399 goto done;
400 }
401 /* else, add a new source to the filter */
402
403 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
404 err = -ENOBUFS;
405 goto done;
406 }
407 if (!psl || psl->sl_count == psl->sl_max) {
408 struct ip6_sf_socklist *newpsl;
409 int count = IP6_SFBLOCK;
410
411 if (psl)
412 count += psl->sl_max;
413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
414 if (!newpsl) {
415 err = -ENOBUFS;
416 goto done;
417 }
418 newpsl->sl_max = count;
419 newpsl->sl_count = count - IP6_SFBLOCK;
420 if (psl) {
421 for (i = 0; i < psl->sl_count; i++)
422 newpsl->sl_addr[i] = psl->sl_addr[i];
423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
424 }
425 pmc->sflist = psl = newpsl;
426 }
427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
428 for (i = 0; i < psl->sl_count; i++) {
429 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
430 if (rv == 0) /* There is an error in the address. */
431 goto done;
432 }
433 for (j = psl->sl_count-1; j >= i; j--)
434 psl->sl_addr[j+1] = psl->sl_addr[j];
435 psl->sl_addr[i] = *source;
436 psl->sl_count++;
437 err = 0;
438 /* update the interface list */
439 ip6_mc_add_src(idev, group, omode, 1, source, 1);
440done:
441 if (pmclocked)
442 write_unlock(&pmc->sflock);
443 read_unlock_bh(&idev->lock);
444 rcu_read_unlock();
445 if (leavegroup)
446 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
447 return err;
448}
449
450int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
451{
452 const struct in6_addr *group;
453 struct ipv6_mc_socklist *pmc;
454 struct inet6_dev *idev;
455 struct ipv6_pinfo *inet6 = inet6_sk(sk);
456 struct ip6_sf_socklist *newpsl, *psl;
457 struct net *net = sock_net(sk);
458 int leavegroup = 0;
459 int i, err;
460
461 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
462
463 if (!ipv6_addr_is_multicast(group))
464 return -EINVAL;
465 if (gsf->gf_fmode != MCAST_INCLUDE &&
466 gsf->gf_fmode != MCAST_EXCLUDE)
467 return -EINVAL;
468
469 rcu_read_lock();
470 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
471
472 if (!idev) {
473 rcu_read_unlock();
474 return -ENODEV;
475 }
476
477 err = 0;
478
479 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
480 leavegroup = 1;
481 goto done;
482 }
483
484 for_each_pmc_rcu(inet6, pmc) {
485 if (pmc->ifindex != gsf->gf_interface)
486 continue;
487 if (ipv6_addr_equal(&pmc->addr, group))
488 break;
489 }
490 if (!pmc) { /* must have a prior join */
491 err = -EINVAL;
492 goto done;
493 }
494 if (gsf->gf_numsrc) {
495 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
496 GFP_ATOMIC);
497 if (!newpsl) {
498 err = -ENOBUFS;
499 goto done;
500 }
501 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
502 for (i = 0; i < newpsl->sl_count; ++i) {
503 struct sockaddr_in6 *psin6;
504
505 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
506 newpsl->sl_addr[i] = psin6->sin6_addr;
507 }
508 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
509 newpsl->sl_count, newpsl->sl_addr, 0);
510 if (err) {
511 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
512 goto done;
513 }
514 } else {
515 newpsl = NULL;
516 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
517 }
518
519 write_lock(&pmc->sflock);
520 psl = pmc->sflist;
521 if (psl) {
522 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
523 psl->sl_count, psl->sl_addr, 0);
524 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
525 } else
526 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
527 pmc->sflist = newpsl;
528 pmc->sfmode = gsf->gf_fmode;
529 write_unlock(&pmc->sflock);
530 err = 0;
531done:
532 read_unlock_bh(&idev->lock);
533 rcu_read_unlock();
534 if (leavegroup)
535 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
536 return err;
537}
538
539int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
540 struct group_filter __user *optval, int __user *optlen)
541{
542 int err, i, count, copycount;
543 const struct in6_addr *group;
544 struct ipv6_mc_socklist *pmc;
545 struct inet6_dev *idev;
546 struct ipv6_pinfo *inet6 = inet6_sk(sk);
547 struct ip6_sf_socklist *psl;
548 struct net *net = sock_net(sk);
549
550 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
551
552 if (!ipv6_addr_is_multicast(group))
553 return -EINVAL;
554
555 rcu_read_lock();
556 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
557
558 if (!idev) {
559 rcu_read_unlock();
560 return -ENODEV;
561 }
562
563 err = -EADDRNOTAVAIL;
564 /* changes to the ipv6_mc_list require the socket lock and
565 * rtnl lock. We have the socket lock and rcu read lock,
566 * so reading the list is safe.
567 */
568
569 for_each_pmc_rcu(inet6, pmc) {
570 if (pmc->ifindex != gsf->gf_interface)
571 continue;
572 if (ipv6_addr_equal(group, &pmc->addr))
573 break;
574 }
575 if (!pmc) /* must have a prior join */
576 goto done;
577 gsf->gf_fmode = pmc->sfmode;
578 psl = pmc->sflist;
579 count = psl ? psl->sl_count : 0;
580 read_unlock_bh(&idev->lock);
581 rcu_read_unlock();
582
583 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
584 gsf->gf_numsrc = count;
585 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
586 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
587 return -EFAULT;
588 }
589 /* changes to psl require the socket lock, and a write lock
590 * on pmc->sflock. We have the socket lock so reading here is safe.
591 */
592 for (i = 0; i < copycount; i++) {
593 struct sockaddr_in6 *psin6;
594 struct sockaddr_storage ss;
595
596 psin6 = (struct sockaddr_in6 *)&ss;
597 memset(&ss, 0, sizeof(ss));
598 psin6->sin6_family = AF_INET6;
599 psin6->sin6_addr = psl->sl_addr[i];
600 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
601 return -EFAULT;
602 }
603 return 0;
604done:
605 read_unlock_bh(&idev->lock);
606 rcu_read_unlock();
607 return err;
608}
609
610bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
611 const struct in6_addr *src_addr)
612{
613 struct ipv6_pinfo *np = inet6_sk(sk);
614 struct ipv6_mc_socklist *mc;
615 struct ip6_sf_socklist *psl;
616 bool rv = true;
617
618 rcu_read_lock();
619 for_each_pmc_rcu(np, mc) {
620 if (ipv6_addr_equal(&mc->addr, mc_addr))
621 break;
622 }
623 if (!mc) {
624 rcu_read_unlock();
625 return true;
626 }
627 read_lock(&mc->sflock);
628 psl = mc->sflist;
629 if (!psl) {
630 rv = mc->sfmode == MCAST_EXCLUDE;
631 } else {
632 int i;
633
634 for (i = 0; i < psl->sl_count; i++) {
635 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
636 break;
637 }
638 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
639 rv = false;
640 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
641 rv = false;
642 }
643 read_unlock(&mc->sflock);
644 rcu_read_unlock();
645
646 return rv;
647}
648
649static void igmp6_group_added(struct ifmcaddr6 *mc)
650{
651 struct net_device *dev = mc->idev->dev;
652 char buf[MAX_ADDR_LEN];
653
654 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
655 IPV6_ADDR_SCOPE_LINKLOCAL)
656 return;
657
658 spin_lock_bh(&mc->mca_lock);
659 if (!(mc->mca_flags&MAF_LOADED)) {
660 mc->mca_flags |= MAF_LOADED;
661 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
662 dev_mc_add(dev, buf);
663 }
664 spin_unlock_bh(&mc->mca_lock);
665
666 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
667 return;
668
669 if (mld_in_v1_mode(mc->idev)) {
670 igmp6_join_group(mc);
671 return;
672 }
673 /* else v2 */
674
675 mc->mca_crcount = mc->idev->mc_qrv;
676 mld_ifc_event(mc->idev);
677}
678
679static void igmp6_group_dropped(struct ifmcaddr6 *mc)
680{
681 struct net_device *dev = mc->idev->dev;
682 char buf[MAX_ADDR_LEN];
683
684 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
685 IPV6_ADDR_SCOPE_LINKLOCAL)
686 return;
687
688 spin_lock_bh(&mc->mca_lock);
689 if (mc->mca_flags&MAF_LOADED) {
690 mc->mca_flags &= ~MAF_LOADED;
691 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
692 dev_mc_del(dev, buf);
693 }
694
695 spin_unlock_bh(&mc->mca_lock);
696 if (mc->mca_flags & MAF_NOREPORT)
697 return;
698
699 if (!mc->idev->dead)
700 igmp6_leave_group(mc);
701
702 spin_lock_bh(&mc->mca_lock);
703 if (del_timer(&mc->mca_timer))
704 refcount_dec(&mc->mca_refcnt);
705 spin_unlock_bh(&mc->mca_lock);
706}
707
708/*
709 * deleted ifmcaddr6 manipulation
710 */
711static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
712{
713 struct ifmcaddr6 *pmc;
714
715 /* this is an "ifmcaddr6" for convenience; only the fields below
716 * are actually used. In particular, the refcnt and users are not
717 * used for management of the delete list. Using the same structure
718 * for deleted items allows change reports to use common code with
719 * non-deleted or query-response MCA's.
720 */
721 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
722 if (!pmc)
723 return;
724
725 spin_lock_bh(&im->mca_lock);
726 spin_lock_init(&pmc->mca_lock);
727 pmc->idev = im->idev;
728 in6_dev_hold(idev);
729 pmc->mca_addr = im->mca_addr;
730 pmc->mca_crcount = idev->mc_qrv;
731 pmc->mca_sfmode = im->mca_sfmode;
732 if (pmc->mca_sfmode == MCAST_INCLUDE) {
733 struct ip6_sf_list *psf;
734
735 pmc->mca_tomb = im->mca_tomb;
736 pmc->mca_sources = im->mca_sources;
737 im->mca_tomb = im->mca_sources = NULL;
738 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
739 psf->sf_crcount = pmc->mca_crcount;
740 }
741 spin_unlock_bh(&im->mca_lock);
742
743 spin_lock_bh(&idev->mc_lock);
744 pmc->next = idev->mc_tomb;
745 idev->mc_tomb = pmc;
746 spin_unlock_bh(&idev->mc_lock);
747}
748
749static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
750{
751 struct ifmcaddr6 *pmc, *pmc_prev;
752 struct ip6_sf_list *psf;
753 struct in6_addr *pmca = &im->mca_addr;
754
755 spin_lock_bh(&idev->mc_lock);
756 pmc_prev = NULL;
757 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
758 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
759 break;
760 pmc_prev = pmc;
761 }
762 if (pmc) {
763 if (pmc_prev)
764 pmc_prev->next = pmc->next;
765 else
766 idev->mc_tomb = pmc->next;
767 }
768 spin_unlock_bh(&idev->mc_lock);
769
770 spin_lock_bh(&im->mca_lock);
771 if (pmc) {
772 im->idev = pmc->idev;
773 im->mca_crcount = idev->mc_qrv;
774 im->mca_sfmode = pmc->mca_sfmode;
775 if (pmc->mca_sfmode == MCAST_INCLUDE) {
776 im->mca_tomb = pmc->mca_tomb;
777 im->mca_sources = pmc->mca_sources;
778 for (psf = im->mca_sources; psf; psf = psf->sf_next)
779 psf->sf_crcount = im->mca_crcount;
780 }
781 in6_dev_put(pmc->idev);
782 kfree(pmc);
783 }
784 spin_unlock_bh(&im->mca_lock);
785}
786
787static void mld_clear_delrec(struct inet6_dev *idev)
788{
789 struct ifmcaddr6 *pmc, *nextpmc;
790
791 spin_lock_bh(&idev->mc_lock);
792 pmc = idev->mc_tomb;
793 idev->mc_tomb = NULL;
794 spin_unlock_bh(&idev->mc_lock);
795
796 for (; pmc; pmc = nextpmc) {
797 nextpmc = pmc->next;
798 ip6_mc_clear_src(pmc);
799 in6_dev_put(pmc->idev);
800 kfree(pmc);
801 }
802
803 /* clear dead sources, too */
804 read_lock_bh(&idev->lock);
805 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
806 struct ip6_sf_list *psf, *psf_next;
807
808 spin_lock_bh(&pmc->mca_lock);
809 psf = pmc->mca_tomb;
810 pmc->mca_tomb = NULL;
811 spin_unlock_bh(&pmc->mca_lock);
812 for (; psf; psf = psf_next) {
813 psf_next = psf->sf_next;
814 kfree(psf);
815 }
816 }
817 read_unlock_bh(&idev->lock);
818}
819
820static void mca_get(struct ifmcaddr6 *mc)
821{
822 refcount_inc(&mc->mca_refcnt);
823}
824
825static void ma_put(struct ifmcaddr6 *mc)
826{
827 if (refcount_dec_and_test(&mc->mca_refcnt)) {
828 in6_dev_put(mc->idev);
829 kfree(mc);
830 }
831}
832
833static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
834 const struct in6_addr *addr)
835{
836 struct ifmcaddr6 *mc;
837
838 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
839 if (!mc)
840 return NULL;
841
842 timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
843
844 mc->mca_addr = *addr;
845 mc->idev = idev; /* reference taken by caller */
846 mc->mca_users = 1;
847 /* mca_stamp should be updated upon changes */
848 mc->mca_cstamp = mc->mca_tstamp = jiffies;
849 refcount_set(&mc->mca_refcnt, 1);
850 spin_lock_init(&mc->mca_lock);
851
852 /* initial mode is (EX, empty) */
853 mc->mca_sfmode = MCAST_EXCLUDE;
854 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
855
856 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
857 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
858 mc->mca_flags |= MAF_NOREPORT;
859
860 return mc;
861}
862
863/*
864 * device multicast group inc (add if not found)
865 */
866int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
867{
868 struct ifmcaddr6 *mc;
869 struct inet6_dev *idev;
870
871 ASSERT_RTNL();
872
873 /* we need to take a reference on idev */
874 idev = in6_dev_get(dev);
875
876 if (!idev)
877 return -EINVAL;
878
879 write_lock_bh(&idev->lock);
880 if (idev->dead) {
881 write_unlock_bh(&idev->lock);
882 in6_dev_put(idev);
883 return -ENODEV;
884 }
885
886 for (mc = idev->mc_list; mc; mc = mc->next) {
887 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
888 mc->mca_users++;
889 write_unlock_bh(&idev->lock);
890 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
891 NULL, 0);
892 in6_dev_put(idev);
893 return 0;
894 }
895 }
896
897 mc = mca_alloc(idev, addr);
898 if (!mc) {
899 write_unlock_bh(&idev->lock);
900 in6_dev_put(idev);
901 return -ENOMEM;
902 }
903
904 mc->next = idev->mc_list;
905 idev->mc_list = mc;
906
907 /* Hold this for the code below before we unlock,
908 * it is already exposed via idev->mc_list.
909 */
910 mca_get(mc);
911 write_unlock_bh(&idev->lock);
912
913 mld_del_delrec(idev, mc);
914 igmp6_group_added(mc);
915 ma_put(mc);
916 return 0;
917}
918
919/*
920 * device multicast group del
921 */
922int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
923{
924 struct ifmcaddr6 *ma, **map;
925
926 ASSERT_RTNL();
927
928 write_lock_bh(&idev->lock);
929 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
930 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
931 if (--ma->mca_users == 0) {
932 *map = ma->next;
933 write_unlock_bh(&idev->lock);
934
935 igmp6_group_dropped(ma);
936 ip6_mc_clear_src(ma);
937
938 ma_put(ma);
939 return 0;
940 }
941 write_unlock_bh(&idev->lock);
942 return 0;
943 }
944 }
945 write_unlock_bh(&idev->lock);
946
947 return -ENOENT;
948}
949
950int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
951{
952 struct inet6_dev *idev;
953 int err;
954
955 ASSERT_RTNL();
956
957 idev = __in6_dev_get(dev);
958 if (!idev)
959 err = -ENODEV;
960 else
961 err = __ipv6_dev_mc_dec(idev, addr);
962
963 return err;
964}
965
966/*
967 * check if the interface/address pair is valid
968 */
969bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
970 const struct in6_addr *src_addr)
971{
972 struct inet6_dev *idev;
973 struct ifmcaddr6 *mc;
974 bool rv = false;
975
976 rcu_read_lock();
977 idev = __in6_dev_get(dev);
978 if (idev) {
979 read_lock_bh(&idev->lock);
980 for (mc = idev->mc_list; mc; mc = mc->next) {
981 if (ipv6_addr_equal(&mc->mca_addr, group))
982 break;
983 }
984 if (mc) {
985 if (src_addr && !ipv6_addr_any(src_addr)) {
986 struct ip6_sf_list *psf;
987
988 spin_lock_bh(&mc->mca_lock);
989 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
990 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
991 break;
992 }
993 if (psf)
994 rv = psf->sf_count[MCAST_INCLUDE] ||
995 psf->sf_count[MCAST_EXCLUDE] !=
996 mc->mca_sfcount[MCAST_EXCLUDE];
997 else
998 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
999 spin_unlock_bh(&mc->mca_lock);
1000 } else
1001 rv = true; /* don't filter unspecified source */
1002 }
1003 read_unlock_bh(&idev->lock);
1004 }
1005 rcu_read_unlock();
1006 return rv;
1007}
1008
1009static void mld_gq_start_timer(struct inet6_dev *idev)
1010{
1011 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1012
1013 idev->mc_gq_running = 1;
1014 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1015 in6_dev_hold(idev);
1016}
1017
1018static void mld_gq_stop_timer(struct inet6_dev *idev)
1019{
1020 idev->mc_gq_running = 0;
1021 if (del_timer(&idev->mc_gq_timer))
1022 __in6_dev_put(idev);
1023}
1024
1025static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1026{
1027 unsigned long tv = prandom_u32() % delay;
1028
1029 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1030 in6_dev_hold(idev);
1031}
1032
1033static void mld_ifc_stop_timer(struct inet6_dev *idev)
1034{
1035 idev->mc_ifc_count = 0;
1036 if (del_timer(&idev->mc_ifc_timer))
1037 __in6_dev_put(idev);
1038}
1039
1040static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1041{
1042 unsigned long tv = prandom_u32() % delay;
1043
1044 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1045 in6_dev_hold(idev);
1046}
1047
1048static void mld_dad_stop_timer(struct inet6_dev *idev)
1049{
1050 if (del_timer(&idev->mc_dad_timer))
1051 __in6_dev_put(idev);
1052}
1053
1054/*
1055 * IGMP handling (alias multicast ICMPv6 messages)
1056 */
1057
1058static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1059{
1060 unsigned long delay = resptime;
1061
1062 /* Do not start timer for these addresses */
1063 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1064 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1065 return;
1066
1067 if (del_timer(&ma->mca_timer)) {
1068 refcount_dec(&ma->mca_refcnt);
1069 delay = ma->mca_timer.expires - jiffies;
1070 }
1071
1072 if (delay >= resptime)
1073 delay = prandom_u32() % resptime;
1074
1075 ma->mca_timer.expires = jiffies + delay;
1076 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1077 refcount_inc(&ma->mca_refcnt);
1078 ma->mca_flags |= MAF_TIMER_RUNNING;
1079}
1080
1081/* mark EXCLUDE-mode sources */
1082static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1083 const struct in6_addr *srcs)
1084{
1085 struct ip6_sf_list *psf;
1086 int i, scount;
1087
1088 scount = 0;
1089 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1090 if (scount == nsrcs)
1091 break;
1092 for (i = 0; i < nsrcs; i++) {
1093 /* skip inactive filters */
1094 if (psf->sf_count[MCAST_INCLUDE] ||
1095 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1096 psf->sf_count[MCAST_EXCLUDE])
1097 break;
1098 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1099 scount++;
1100 break;
1101 }
1102 }
1103 }
1104 pmc->mca_flags &= ~MAF_GSQUERY;
1105 if (scount == nsrcs) /* all sources excluded */
1106 return false;
1107 return true;
1108}
1109
1110static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1111 const struct in6_addr *srcs)
1112{
1113 struct ip6_sf_list *psf;
1114 int i, scount;
1115
1116 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1117 return mld_xmarksources(pmc, nsrcs, srcs);
1118
1119 /* mark INCLUDE-mode sources */
1120
1121 scount = 0;
1122 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1123 if (scount == nsrcs)
1124 break;
1125 for (i = 0; i < nsrcs; i++) {
1126 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1127 psf->sf_gsresp = 1;
1128 scount++;
1129 break;
1130 }
1131 }
1132 }
1133 if (!scount) {
1134 pmc->mca_flags &= ~MAF_GSQUERY;
1135 return false;
1136 }
1137 pmc->mca_flags |= MAF_GSQUERY;
1138 return true;
1139}
1140
1141static int mld_force_mld_version(const struct inet6_dev *idev)
1142{
1143 /* Normally, both are 0 here. If enforcement to a particular is
1144 * being used, individual device enforcement will have a lower
1145 * precedence over 'all' device (.../conf/all/force_mld_version).
1146 */
1147
1148 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1149 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1150 else
1151 return idev->cnf.force_mld_version;
1152}
1153
1154static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1155{
1156 return mld_force_mld_version(idev) == 2;
1157}
1158
1159static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1160{
1161 return mld_force_mld_version(idev) == 1;
1162}
1163
1164static bool mld_in_v1_mode(const struct inet6_dev *idev)
1165{
1166 if (mld_in_v2_mode_only(idev))
1167 return false;
1168 if (mld_in_v1_mode_only(idev))
1169 return true;
1170 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1171 return true;
1172
1173 return false;
1174}
1175
1176static void mld_set_v1_mode(struct inet6_dev *idev)
1177{
1178 /* RFC3810, relevant sections:
1179 * - 9.1. Robustness Variable
1180 * - 9.2. Query Interval
1181 * - 9.3. Query Response Interval
1182 * - 9.12. Older Version Querier Present Timeout
1183 */
1184 unsigned long switchback;
1185
1186 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1187
1188 idev->mc_v1_seen = jiffies + switchback;
1189}
1190
1191static void mld_update_qrv(struct inet6_dev *idev,
1192 const struct mld2_query *mlh2)
1193{
1194 /* RFC3810, relevant sections:
1195 * - 5.1.8. QRV (Querier's Robustness Variable)
1196 * - 9.1. Robustness Variable
1197 */
1198
1199 /* The value of the Robustness Variable MUST NOT be zero,
1200 * and SHOULD NOT be one. Catch this here if we ever run
1201 * into such a case in future.
1202 */
1203 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1204 WARN_ON(idev->mc_qrv == 0);
1205
1206 if (mlh2->mld2q_qrv > 0)
1207 idev->mc_qrv = mlh2->mld2q_qrv;
1208
1209 if (unlikely(idev->mc_qrv < min_qrv)) {
1210 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1211 idev->mc_qrv, min_qrv);
1212 idev->mc_qrv = min_qrv;
1213 }
1214}
1215
1216static void mld_update_qi(struct inet6_dev *idev,
1217 const struct mld2_query *mlh2)
1218{
1219 /* RFC3810, relevant sections:
1220 * - 5.1.9. QQIC (Querier's Query Interval Code)
1221 * - 9.2. Query Interval
1222 * - 9.12. Older Version Querier Present Timeout
1223 * (the [Query Interval] in the last Query received)
1224 */
1225 unsigned long mc_qqi;
1226
1227 if (mlh2->mld2q_qqic < 128) {
1228 mc_qqi = mlh2->mld2q_qqic;
1229 } else {
1230 unsigned long mc_man, mc_exp;
1231
1232 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1233 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1234
1235 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1236 }
1237
1238 idev->mc_qi = mc_qqi * HZ;
1239}
1240
1241static void mld_update_qri(struct inet6_dev *idev,
1242 const struct mld2_query *mlh2)
1243{
1244 /* RFC3810, relevant sections:
1245 * - 5.1.3. Maximum Response Code
1246 * - 9.3. Query Response Interval
1247 */
1248 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1249}
1250
1251static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1252 unsigned long *max_delay, bool v1_query)
1253{
1254 unsigned long mldv1_md;
1255
1256 /* Ignore v1 queries */
1257 if (mld_in_v2_mode_only(idev))
1258 return -EINVAL;
1259
1260 mldv1_md = ntohs(mld->mld_maxdelay);
1261
1262 /* When in MLDv1 fallback and a MLDv2 router start-up being
1263 * unaware of current MLDv1 operation, the MRC == MRD mapping
1264 * only works when the exponential algorithm is not being
1265 * used (as MLDv1 is unaware of such things).
1266 *
1267 * According to the RFC author, the MLDv2 implementations
1268 * he's aware of all use a MRC < 32768 on start up queries.
1269 *
1270 * Thus, should we *ever* encounter something else larger
1271 * than that, just assume the maximum possible within our
1272 * reach.
1273 */
1274 if (!v1_query)
1275 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1276
1277 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1278
1279 /* MLDv1 router present: we need to go into v1 mode *only*
1280 * when an MLDv1 query is received as per section 9.12. of
1281 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1282 * queries MUST be of exactly 24 octets.
1283 */
1284 if (v1_query)
1285 mld_set_v1_mode(idev);
1286
1287 /* cancel MLDv2 report timer */
1288 mld_gq_stop_timer(idev);
1289 /* cancel the interface change timer */
1290 mld_ifc_stop_timer(idev);
1291 /* clear deleted report items */
1292 mld_clear_delrec(idev);
1293
1294 return 0;
1295}
1296
1297static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1298 unsigned long *max_delay)
1299{
1300 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1301
1302 mld_update_qrv(idev, mld);
1303 mld_update_qi(idev, mld);
1304 mld_update_qri(idev, mld);
1305
1306 idev->mc_maxdelay = *max_delay;
1307
1308 return 0;
1309}
1310
1311/* called with rcu_read_lock() */
1312int igmp6_event_query(struct sk_buff *skb)
1313{
1314 struct mld2_query *mlh2 = NULL;
1315 struct ifmcaddr6 *ma;
1316 const struct in6_addr *group;
1317 unsigned long max_delay;
1318 struct inet6_dev *idev;
1319 struct mld_msg *mld;
1320 int group_type;
1321 int mark = 0;
1322 int len, err;
1323
1324 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1325 return -EINVAL;
1326
1327 /* compute payload length excluding extension headers */
1328 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1329 len -= skb_network_header_len(skb);
1330
1331 /* RFC3810 6.2
1332 * Upon reception of an MLD message that contains a Query, the node
1333 * checks if the source address of the message is a valid link-local
1334 * address, if the Hop Limit is set to 1, and if the Router Alert
1335 * option is present in the Hop-By-Hop Options header of the IPv6
1336 * packet. If any of these checks fails, the packet is dropped.
1337 */
1338 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1339 ipv6_hdr(skb)->hop_limit != 1 ||
1340 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1341 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1342 return -EINVAL;
1343
1344 idev = __in6_dev_get(skb->dev);
1345 if (!idev)
1346 return 0;
1347
1348 mld = (struct mld_msg *)icmp6_hdr(skb);
1349 group = &mld->mld_mca;
1350 group_type = ipv6_addr_type(group);
1351
1352 if (group_type != IPV6_ADDR_ANY &&
1353 !(group_type&IPV6_ADDR_MULTICAST))
1354 return -EINVAL;
1355
1356 if (len < MLD_V1_QUERY_LEN) {
1357 return -EINVAL;
1358 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1359 err = mld_process_v1(idev, mld, &max_delay,
1360 len == MLD_V1_QUERY_LEN);
1361 if (err < 0)
1362 return err;
1363 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1364 int srcs_offset = sizeof(struct mld2_query) -
1365 sizeof(struct icmp6hdr);
1366
1367 if (!pskb_may_pull(skb, srcs_offset))
1368 return -EINVAL;
1369
1370 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1371
1372 err = mld_process_v2(idev, mlh2, &max_delay);
1373 if (err < 0)
1374 return err;
1375
1376 if (group_type == IPV6_ADDR_ANY) { /* general query */
1377 if (mlh2->mld2q_nsrcs)
1378 return -EINVAL; /* no sources allowed */
1379
1380 mld_gq_start_timer(idev);
1381 return 0;
1382 }
1383 /* mark sources to include, if group & source-specific */
1384 if (mlh2->mld2q_nsrcs != 0) {
1385 if (!pskb_may_pull(skb, srcs_offset +
1386 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1387 return -EINVAL;
1388
1389 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1390 mark = 1;
1391 }
1392 } else {
1393 return -EINVAL;
1394 }
1395
1396 read_lock_bh(&idev->lock);
1397 if (group_type == IPV6_ADDR_ANY) {
1398 for (ma = idev->mc_list; ma; ma = ma->next) {
1399 spin_lock_bh(&ma->mca_lock);
1400 igmp6_group_queried(ma, max_delay);
1401 spin_unlock_bh(&ma->mca_lock);
1402 }
1403 } else {
1404 for (ma = idev->mc_list; ma; ma = ma->next) {
1405 if (!ipv6_addr_equal(group, &ma->mca_addr))
1406 continue;
1407 spin_lock_bh(&ma->mca_lock);
1408 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1409 /* gsquery <- gsquery && mark */
1410 if (!mark)
1411 ma->mca_flags &= ~MAF_GSQUERY;
1412 } else {
1413 /* gsquery <- mark */
1414 if (mark)
1415 ma->mca_flags |= MAF_GSQUERY;
1416 else
1417 ma->mca_flags &= ~MAF_GSQUERY;
1418 }
1419 if (!(ma->mca_flags & MAF_GSQUERY) ||
1420 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1421 igmp6_group_queried(ma, max_delay);
1422 spin_unlock_bh(&ma->mca_lock);
1423 break;
1424 }
1425 }
1426 read_unlock_bh(&idev->lock);
1427
1428 return 0;
1429}
1430
1431/* called with rcu_read_lock() */
1432int igmp6_event_report(struct sk_buff *skb)
1433{
1434 struct ifmcaddr6 *ma;
1435 struct inet6_dev *idev;
1436 struct mld_msg *mld;
1437 int addr_type;
1438
1439 /* Our own report looped back. Ignore it. */
1440 if (skb->pkt_type == PACKET_LOOPBACK)
1441 return 0;
1442
1443 /* send our report if the MC router may not have heard this report */
1444 if (skb->pkt_type != PACKET_MULTICAST &&
1445 skb->pkt_type != PACKET_BROADCAST)
1446 return 0;
1447
1448 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1449 return -EINVAL;
1450
1451 mld = (struct mld_msg *)icmp6_hdr(skb);
1452
1453 /* Drop reports with not link local source */
1454 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1455 if (addr_type != IPV6_ADDR_ANY &&
1456 !(addr_type&IPV6_ADDR_LINKLOCAL))
1457 return -EINVAL;
1458
1459 idev = __in6_dev_get(skb->dev);
1460 if (!idev)
1461 return -ENODEV;
1462
1463 /*
1464 * Cancel the timer for this group
1465 */
1466
1467 read_lock_bh(&idev->lock);
1468 for (ma = idev->mc_list; ma; ma = ma->next) {
1469 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1470 spin_lock(&ma->mca_lock);
1471 if (del_timer(&ma->mca_timer))
1472 refcount_dec(&ma->mca_refcnt);
1473 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1474 spin_unlock(&ma->mca_lock);
1475 break;
1476 }
1477 }
1478 read_unlock_bh(&idev->lock);
1479 return 0;
1480}
1481
1482static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1483 int gdeleted, int sdeleted)
1484{
1485 switch (type) {
1486 case MLD2_MODE_IS_INCLUDE:
1487 case MLD2_MODE_IS_EXCLUDE:
1488 if (gdeleted || sdeleted)
1489 return false;
1490 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1491 if (pmc->mca_sfmode == MCAST_INCLUDE)
1492 return true;
1493 /* don't include if this source is excluded
1494 * in all filters
1495 */
1496 if (psf->sf_count[MCAST_INCLUDE])
1497 return type == MLD2_MODE_IS_INCLUDE;
1498 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1499 psf->sf_count[MCAST_EXCLUDE];
1500 }
1501 return false;
1502 case MLD2_CHANGE_TO_INCLUDE:
1503 if (gdeleted || sdeleted)
1504 return false;
1505 return psf->sf_count[MCAST_INCLUDE] != 0;
1506 case MLD2_CHANGE_TO_EXCLUDE:
1507 if (gdeleted || sdeleted)
1508 return false;
1509 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1510 psf->sf_count[MCAST_INCLUDE])
1511 return false;
1512 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1513 psf->sf_count[MCAST_EXCLUDE];
1514 case MLD2_ALLOW_NEW_SOURCES:
1515 if (gdeleted || !psf->sf_crcount)
1516 return false;
1517 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1518 case MLD2_BLOCK_OLD_SOURCES:
1519 if (pmc->mca_sfmode == MCAST_INCLUDE)
1520 return gdeleted || (psf->sf_crcount && sdeleted);
1521 return psf->sf_crcount && !gdeleted && !sdeleted;
1522 }
1523 return false;
1524}
1525
1526static int
1527mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1528{
1529 struct ip6_sf_list *psf;
1530 int scount = 0;
1531
1532 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1533 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1534 continue;
1535 scount++;
1536 }
1537 return scount;
1538}
1539
1540static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1541 struct net_device *dev,
1542 const struct in6_addr *saddr,
1543 const struct in6_addr *daddr,
1544 int proto, int len)
1545{
1546 struct ipv6hdr *hdr;
1547
1548 skb->protocol = htons(ETH_P_IPV6);
1549 skb->dev = dev;
1550
1551 skb_reset_network_header(skb);
1552 skb_put(skb, sizeof(struct ipv6hdr));
1553 hdr = ipv6_hdr(skb);
1554
1555 ip6_flow_hdr(hdr, 0, 0);
1556
1557 hdr->payload_len = htons(len);
1558 hdr->nexthdr = proto;
1559 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1560
1561 hdr->saddr = *saddr;
1562 hdr->daddr = *daddr;
1563}
1564
1565static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1566{
1567 struct net_device *dev = idev->dev;
1568 struct net *net = dev_net(dev);
1569 struct sock *sk = net->ipv6.igmp_sk;
1570 struct sk_buff *skb;
1571 struct mld2_report *pmr;
1572 struct in6_addr addr_buf;
1573 const struct in6_addr *saddr;
1574 int hlen = LL_RESERVED_SPACE(dev);
1575 int tlen = dev->needed_tailroom;
1576 unsigned int size = mtu + hlen + tlen;
1577 int err;
1578 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1579 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1580 IPV6_TLV_PADN, 0 };
1581
1582 /* we assume size > sizeof(ra) here */
1583 /* limit our allocations to order-0 page */
1584 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1585 skb = sock_alloc_send_skb(sk, size, 1, &err);
1586
1587 if (!skb)
1588 return NULL;
1589
1590 skb->priority = TC_PRIO_CONTROL;
1591 skb_reserve(skb, hlen);
1592 skb_tailroom_reserve(skb, mtu, tlen);
1593
1594 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1595 /* <draft-ietf-magma-mld-source-05.txt>:
1596 * use unspecified address as the source address
1597 * when a valid link-local address is not available.
1598 */
1599 saddr = &in6addr_any;
1600 } else
1601 saddr = &addr_buf;
1602
1603 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1604
1605 skb_put_data(skb, ra, sizeof(ra));
1606
1607 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1608 skb_put(skb, sizeof(*pmr));
1609 pmr = (struct mld2_report *)skb_transport_header(skb);
1610 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1611 pmr->mld2r_resv1 = 0;
1612 pmr->mld2r_cksum = 0;
1613 pmr->mld2r_resv2 = 0;
1614 pmr->mld2r_ngrec = 0;
1615 return skb;
1616}
1617
1618static void mld_sendpack(struct sk_buff *skb)
1619{
1620 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1621 struct mld2_report *pmr =
1622 (struct mld2_report *)skb_transport_header(skb);
1623 int payload_len, mldlen;
1624 struct inet6_dev *idev;
1625 struct net *net = dev_net(skb->dev);
1626 int err;
1627 struct flowi6 fl6;
1628 struct dst_entry *dst;
1629
1630 rcu_read_lock();
1631 idev = __in6_dev_get(skb->dev);
1632 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1633
1634 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1635 sizeof(*pip6);
1636 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1637 pip6->payload_len = htons(payload_len);
1638
1639 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1640 IPPROTO_ICMPV6,
1641 csum_partial(skb_transport_header(skb),
1642 mldlen, 0));
1643
1644 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1645 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1646 skb->dev->ifindex);
1647 dst = icmp6_dst_alloc(skb->dev, &fl6);
1648
1649 err = 0;
1650 if (IS_ERR(dst)) {
1651 err = PTR_ERR(dst);
1652 dst = NULL;
1653 }
1654 skb_dst_set(skb, dst);
1655 if (err)
1656 goto err_out;
1657
1658 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1659 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1660 dst_output);
1661out:
1662 if (!err) {
1663 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1664 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1665 } else {
1666 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1667 }
1668
1669 rcu_read_unlock();
1670 return;
1671
1672err_out:
1673 kfree_skb(skb);
1674 goto out;
1675}
1676
1677static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1678{
1679 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1680}
1681
1682static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1683 int type, struct mld2_grec **ppgr, unsigned int mtu)
1684{
1685 struct mld2_report *pmr;
1686 struct mld2_grec *pgr;
1687
1688 if (!skb) {
1689 skb = mld_newpack(pmc->idev, mtu);
1690 if (!skb)
1691 return NULL;
1692 }
1693 pgr = skb_put(skb, sizeof(struct mld2_grec));
1694 pgr->grec_type = type;
1695 pgr->grec_auxwords = 0;
1696 pgr->grec_nsrcs = 0;
1697 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1698 pmr = (struct mld2_report *)skb_transport_header(skb);
1699 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1700 *ppgr = pgr;
1701 return skb;
1702}
1703
1704#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1705
1706static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1707 int type, int gdeleted, int sdeleted, int crsend)
1708{
1709 struct inet6_dev *idev = pmc->idev;
1710 struct net_device *dev = idev->dev;
1711 struct mld2_report *pmr;
1712 struct mld2_grec *pgr = NULL;
1713 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1714 int scount, stotal, first, isquery, truncate;
1715 unsigned int mtu;
1716
1717 if (pmc->mca_flags & MAF_NOREPORT)
1718 return skb;
1719
1720 mtu = READ_ONCE(dev->mtu);
1721 if (mtu < IPV6_MIN_MTU)
1722 return skb;
1723
1724 isquery = type == MLD2_MODE_IS_INCLUDE ||
1725 type == MLD2_MODE_IS_EXCLUDE;
1726 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1727 type == MLD2_CHANGE_TO_EXCLUDE;
1728
1729 stotal = scount = 0;
1730
1731 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1732
1733 if (!*psf_list)
1734 goto empty_source;
1735
1736 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1737
1738 /* EX and TO_EX get a fresh packet, if needed */
1739 if (truncate) {
1740 if (pmr && pmr->mld2r_ngrec &&
1741 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1742 if (skb)
1743 mld_sendpack(skb);
1744 skb = mld_newpack(idev, mtu);
1745 }
1746 }
1747 first = 1;
1748 psf_prev = NULL;
1749 for (psf = *psf_list; psf; psf = psf_next) {
1750 struct in6_addr *psrc;
1751
1752 psf_next = psf->sf_next;
1753
1754 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1755 psf_prev = psf;
1756 continue;
1757 }
1758
1759 /* Based on RFC3810 6.1. Should not send source-list change
1760 * records when there is a filter mode change.
1761 */
1762 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1763 (!gdeleted && pmc->mca_crcount)) &&
1764 (type == MLD2_ALLOW_NEW_SOURCES ||
1765 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1766 goto decrease_sf_crcount;
1767
1768 /* clear marks on query responses */
1769 if (isquery)
1770 psf->sf_gsresp = 0;
1771
1772 if (AVAILABLE(skb) < sizeof(*psrc) +
1773 first*sizeof(struct mld2_grec)) {
1774 if (truncate && !first)
1775 break; /* truncate these */
1776 if (pgr)
1777 pgr->grec_nsrcs = htons(scount);
1778 if (skb)
1779 mld_sendpack(skb);
1780 skb = mld_newpack(idev, mtu);
1781 first = 1;
1782 scount = 0;
1783 }
1784 if (first) {
1785 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1786 first = 0;
1787 }
1788 if (!skb)
1789 return NULL;
1790 psrc = skb_put(skb, sizeof(*psrc));
1791 *psrc = psf->sf_addr;
1792 scount++; stotal++;
1793 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1794 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1795decrease_sf_crcount:
1796 psf->sf_crcount--;
1797 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1798 if (psf_prev)
1799 psf_prev->sf_next = psf->sf_next;
1800 else
1801 *psf_list = psf->sf_next;
1802 kfree(psf);
1803 continue;
1804 }
1805 }
1806 psf_prev = psf;
1807 }
1808
1809empty_source:
1810 if (!stotal) {
1811 if (type == MLD2_ALLOW_NEW_SOURCES ||
1812 type == MLD2_BLOCK_OLD_SOURCES)
1813 return skb;
1814 if (pmc->mca_crcount || isquery || crsend) {
1815 /* make sure we have room for group header */
1816 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1817 mld_sendpack(skb);
1818 skb = NULL; /* add_grhead will get a new one */
1819 }
1820 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1821 }
1822 }
1823 if (pgr)
1824 pgr->grec_nsrcs = htons(scount);
1825
1826 if (isquery)
1827 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1828 return skb;
1829}
1830
1831static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1832{
1833 struct sk_buff *skb = NULL;
1834 int type;
1835
1836 read_lock_bh(&idev->lock);
1837 if (!pmc) {
1838 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1839 if (pmc->mca_flags & MAF_NOREPORT)
1840 continue;
1841 spin_lock_bh(&pmc->mca_lock);
1842 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1843 type = MLD2_MODE_IS_EXCLUDE;
1844 else
1845 type = MLD2_MODE_IS_INCLUDE;
1846 skb = add_grec(skb, pmc, type, 0, 0, 0);
1847 spin_unlock_bh(&pmc->mca_lock);
1848 }
1849 } else {
1850 spin_lock_bh(&pmc->mca_lock);
1851 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1852 type = MLD2_MODE_IS_EXCLUDE;
1853 else
1854 type = MLD2_MODE_IS_INCLUDE;
1855 skb = add_grec(skb, pmc, type, 0, 0, 0);
1856 spin_unlock_bh(&pmc->mca_lock);
1857 }
1858 read_unlock_bh(&idev->lock);
1859 if (skb)
1860 mld_sendpack(skb);
1861}
1862
1863/*
1864 * remove zero-count source records from a source filter list
1865 */
1866static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1867{
1868 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1869
1870 psf_prev = NULL;
1871 for (psf = *ppsf; psf; psf = psf_next) {
1872 psf_next = psf->sf_next;
1873 if (psf->sf_crcount == 0) {
1874 if (psf_prev)
1875 psf_prev->sf_next = psf->sf_next;
1876 else
1877 *ppsf = psf->sf_next;
1878 kfree(psf);
1879 } else
1880 psf_prev = psf;
1881 }
1882}
1883
1884static void mld_send_cr(struct inet6_dev *idev)
1885{
1886 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1887 struct sk_buff *skb = NULL;
1888 int type, dtype;
1889
1890 read_lock_bh(&idev->lock);
1891 spin_lock(&idev->mc_lock);
1892
1893 /* deleted MCA's */
1894 pmc_prev = NULL;
1895 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1896 pmc_next = pmc->next;
1897 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1898 type = MLD2_BLOCK_OLD_SOURCES;
1899 dtype = MLD2_BLOCK_OLD_SOURCES;
1900 skb = add_grec(skb, pmc, type, 1, 0, 0);
1901 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1902 }
1903 if (pmc->mca_crcount) {
1904 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1905 type = MLD2_CHANGE_TO_INCLUDE;
1906 skb = add_grec(skb, pmc, type, 1, 0, 0);
1907 }
1908 pmc->mca_crcount--;
1909 if (pmc->mca_crcount == 0) {
1910 mld_clear_zeros(&pmc->mca_tomb);
1911 mld_clear_zeros(&pmc->mca_sources);
1912 }
1913 }
1914 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1915 !pmc->mca_sources) {
1916 if (pmc_prev)
1917 pmc_prev->next = pmc_next;
1918 else
1919 idev->mc_tomb = pmc_next;
1920 in6_dev_put(pmc->idev);
1921 kfree(pmc);
1922 } else
1923 pmc_prev = pmc;
1924 }
1925 spin_unlock(&idev->mc_lock);
1926
1927 /* change recs */
1928 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1929 spin_lock_bh(&pmc->mca_lock);
1930 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1931 type = MLD2_BLOCK_OLD_SOURCES;
1932 dtype = MLD2_ALLOW_NEW_SOURCES;
1933 } else {
1934 type = MLD2_ALLOW_NEW_SOURCES;
1935 dtype = MLD2_BLOCK_OLD_SOURCES;
1936 }
1937 skb = add_grec(skb, pmc, type, 0, 0, 0);
1938 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1939
1940 /* filter mode changes */
1941 if (pmc->mca_crcount) {
1942 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1943 type = MLD2_CHANGE_TO_EXCLUDE;
1944 else
1945 type = MLD2_CHANGE_TO_INCLUDE;
1946 skb = add_grec(skb, pmc, type, 0, 0, 0);
1947 pmc->mca_crcount--;
1948 }
1949 spin_unlock_bh(&pmc->mca_lock);
1950 }
1951 read_unlock_bh(&idev->lock);
1952 if (!skb)
1953 return;
1954 (void) mld_sendpack(skb);
1955}
1956
1957static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1958{
1959 struct net *net = dev_net(dev);
1960 struct sock *sk = net->ipv6.igmp_sk;
1961 struct inet6_dev *idev;
1962 struct sk_buff *skb;
1963 struct mld_msg *hdr;
1964 const struct in6_addr *snd_addr, *saddr;
1965 struct in6_addr addr_buf;
1966 int hlen = LL_RESERVED_SPACE(dev);
1967 int tlen = dev->needed_tailroom;
1968 int err, len, payload_len, full_len;
1969 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1970 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1971 IPV6_TLV_PADN, 0 };
1972 struct flowi6 fl6;
1973 struct dst_entry *dst;
1974
1975 if (type == ICMPV6_MGM_REDUCTION)
1976 snd_addr = &in6addr_linklocal_allrouters;
1977 else
1978 snd_addr = addr;
1979
1980 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1981 payload_len = len + sizeof(ra);
1982 full_len = sizeof(struct ipv6hdr) + payload_len;
1983
1984 rcu_read_lock();
1985 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1986 IPSTATS_MIB_OUT, full_len);
1987 rcu_read_unlock();
1988
1989 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1990
1991 if (!skb) {
1992 rcu_read_lock();
1993 IP6_INC_STATS(net, __in6_dev_get(dev),
1994 IPSTATS_MIB_OUTDISCARDS);
1995 rcu_read_unlock();
1996 return;
1997 }
1998 skb->priority = TC_PRIO_CONTROL;
1999 skb_reserve(skb, hlen);
2000
2001 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2002 /* <draft-ietf-magma-mld-source-05.txt>:
2003 * use unspecified address as the source address
2004 * when a valid link-local address is not available.
2005 */
2006 saddr = &in6addr_any;
2007 } else
2008 saddr = &addr_buf;
2009
2010 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2011
2012 skb_put_data(skb, ra, sizeof(ra));
2013
2014 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2015 hdr->mld_type = type;
2016 hdr->mld_mca = *addr;
2017
2018 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2019 IPPROTO_ICMPV6,
2020 csum_partial(hdr, len, 0));
2021
2022 rcu_read_lock();
2023 idev = __in6_dev_get(skb->dev);
2024
2025 icmpv6_flow_init(sk, &fl6, type,
2026 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2027 skb->dev->ifindex);
2028 dst = icmp6_dst_alloc(skb->dev, &fl6);
2029 if (IS_ERR(dst)) {
2030 err = PTR_ERR(dst);
2031 goto err_out;
2032 }
2033
2034 skb_dst_set(skb, dst);
2035 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2036 net, sk, skb, NULL, skb->dev,
2037 dst_output);
2038out:
2039 if (!err) {
2040 ICMP6MSGOUT_INC_STATS(net, idev, type);
2041 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2042 } else
2043 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2044
2045 rcu_read_unlock();
2046 return;
2047
2048err_out:
2049 kfree_skb(skb);
2050 goto out;
2051}
2052
2053static void mld_send_initial_cr(struct inet6_dev *idev)
2054{
2055 struct sk_buff *skb;
2056 struct ifmcaddr6 *pmc;
2057 int type;
2058
2059 if (mld_in_v1_mode(idev))
2060 return;
2061
2062 skb = NULL;
2063 read_lock_bh(&idev->lock);
2064 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2065 spin_lock_bh(&pmc->mca_lock);
2066 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2067 type = MLD2_CHANGE_TO_EXCLUDE;
2068 else
2069 type = MLD2_CHANGE_TO_INCLUDE;
2070 skb = add_grec(skb, pmc, type, 0, 0, 1);
2071 spin_unlock_bh(&pmc->mca_lock);
2072 }
2073 read_unlock_bh(&idev->lock);
2074 if (skb)
2075 mld_sendpack(skb);
2076}
2077
2078void ipv6_mc_dad_complete(struct inet6_dev *idev)
2079{
2080 idev->mc_dad_count = idev->mc_qrv;
2081 if (idev->mc_dad_count) {
2082 mld_send_initial_cr(idev);
2083 idev->mc_dad_count--;
2084 if (idev->mc_dad_count)
2085 mld_dad_start_timer(idev, idev->mc_maxdelay);
2086 }
2087}
2088
2089static void mld_dad_timer_expire(struct timer_list *t)
2090{
2091 struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
2092
2093 mld_send_initial_cr(idev);
2094 if (idev->mc_dad_count) {
2095 idev->mc_dad_count--;
2096 if (idev->mc_dad_count)
2097 mld_dad_start_timer(idev, idev->mc_maxdelay);
2098 }
2099 in6_dev_put(idev);
2100}
2101
2102static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2103 const struct in6_addr *psfsrc)
2104{
2105 struct ip6_sf_list *psf, *psf_prev;
2106 int rv = 0;
2107
2108 psf_prev = NULL;
2109 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2110 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2111 break;
2112 psf_prev = psf;
2113 }
2114 if (!psf || psf->sf_count[sfmode] == 0) {
2115 /* source filter not found, or count wrong => bug */
2116 return -ESRCH;
2117 }
2118 psf->sf_count[sfmode]--;
2119 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2120 struct inet6_dev *idev = pmc->idev;
2121
2122 /* no more filters for this source */
2123 if (psf_prev)
2124 psf_prev->sf_next = psf->sf_next;
2125 else
2126 pmc->mca_sources = psf->sf_next;
2127 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2128 !mld_in_v1_mode(idev)) {
2129 psf->sf_crcount = idev->mc_qrv;
2130 psf->sf_next = pmc->mca_tomb;
2131 pmc->mca_tomb = psf;
2132 rv = 1;
2133 } else
2134 kfree(psf);
2135 }
2136 return rv;
2137}
2138
2139static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2140 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2141 int delta)
2142{
2143 struct ifmcaddr6 *pmc;
2144 int changerec = 0;
2145 int i, err;
2146
2147 if (!idev)
2148 return -ENODEV;
2149 read_lock_bh(&idev->lock);
2150 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2151 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2152 break;
2153 }
2154 if (!pmc) {
2155 /* MCA not found?? bug */
2156 read_unlock_bh(&idev->lock);
2157 return -ESRCH;
2158 }
2159 spin_lock_bh(&pmc->mca_lock);
2160 sf_markstate(pmc);
2161 if (!delta) {
2162 if (!pmc->mca_sfcount[sfmode]) {
2163 spin_unlock_bh(&pmc->mca_lock);
2164 read_unlock_bh(&idev->lock);
2165 return -EINVAL;
2166 }
2167 pmc->mca_sfcount[sfmode]--;
2168 }
2169 err = 0;
2170 for (i = 0; i < sfcount; i++) {
2171 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2172
2173 changerec |= rv > 0;
2174 if (!err && rv < 0)
2175 err = rv;
2176 }
2177 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2178 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2179 pmc->mca_sfcount[MCAST_INCLUDE]) {
2180 struct ip6_sf_list *psf;
2181
2182 /* filter mode change */
2183 pmc->mca_sfmode = MCAST_INCLUDE;
2184 pmc->mca_crcount = idev->mc_qrv;
2185 idev->mc_ifc_count = pmc->mca_crcount;
2186 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2187 psf->sf_crcount = 0;
2188 mld_ifc_event(pmc->idev);
2189 } else if (sf_setstate(pmc) || changerec)
2190 mld_ifc_event(pmc->idev);
2191 spin_unlock_bh(&pmc->mca_lock);
2192 read_unlock_bh(&idev->lock);
2193 return err;
2194}
2195
2196/*
2197 * Add multicast single-source filter to the interface list
2198 */
2199static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2200 const struct in6_addr *psfsrc)
2201{
2202 struct ip6_sf_list *psf, *psf_prev;
2203
2204 psf_prev = NULL;
2205 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2206 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2207 break;
2208 psf_prev = psf;
2209 }
2210 if (!psf) {
2211 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2212 if (!psf)
2213 return -ENOBUFS;
2214
2215 psf->sf_addr = *psfsrc;
2216 if (psf_prev) {
2217 psf_prev->sf_next = psf;
2218 } else
2219 pmc->mca_sources = psf;
2220 }
2221 psf->sf_count[sfmode]++;
2222 return 0;
2223}
2224
2225static void sf_markstate(struct ifmcaddr6 *pmc)
2226{
2227 struct ip6_sf_list *psf;
2228 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2229
2230 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2231 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2232 psf->sf_oldin = mca_xcount ==
2233 psf->sf_count[MCAST_EXCLUDE] &&
2234 !psf->sf_count[MCAST_INCLUDE];
2235 } else
2236 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2237}
2238
2239static int sf_setstate(struct ifmcaddr6 *pmc)
2240{
2241 struct ip6_sf_list *psf, *dpsf;
2242 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2243 int qrv = pmc->idev->mc_qrv;
2244 int new_in, rv;
2245
2246 rv = 0;
2247 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2248 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2249 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2250 !psf->sf_count[MCAST_INCLUDE];
2251 } else
2252 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2253 if (new_in) {
2254 if (!psf->sf_oldin) {
2255 struct ip6_sf_list *prev = NULL;
2256
2257 for (dpsf = pmc->mca_tomb; dpsf;
2258 dpsf = dpsf->sf_next) {
2259 if (ipv6_addr_equal(&dpsf->sf_addr,
2260 &psf->sf_addr))
2261 break;
2262 prev = dpsf;
2263 }
2264 if (dpsf) {
2265 if (prev)
2266 prev->sf_next = dpsf->sf_next;
2267 else
2268 pmc->mca_tomb = dpsf->sf_next;
2269 kfree(dpsf);
2270 }
2271 psf->sf_crcount = qrv;
2272 rv++;
2273 }
2274 } else if (psf->sf_oldin) {
2275 psf->sf_crcount = 0;
2276 /*
2277 * add or update "delete" records if an active filter
2278 * is now inactive
2279 */
2280 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2281 if (ipv6_addr_equal(&dpsf->sf_addr,
2282 &psf->sf_addr))
2283 break;
2284 if (!dpsf) {
2285 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2286 if (!dpsf)
2287 continue;
2288 *dpsf = *psf;
2289 /* pmc->mca_lock held by callers */
2290 dpsf->sf_next = pmc->mca_tomb;
2291 pmc->mca_tomb = dpsf;
2292 }
2293 dpsf->sf_crcount = qrv;
2294 rv++;
2295 }
2296 }
2297 return rv;
2298}
2299
2300/*
2301 * Add multicast source filter list to the interface list
2302 */
2303static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2304 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2305 int delta)
2306{
2307 struct ifmcaddr6 *pmc;
2308 int isexclude;
2309 int i, err;
2310
2311 if (!idev)
2312 return -ENODEV;
2313 read_lock_bh(&idev->lock);
2314 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2315 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2316 break;
2317 }
2318 if (!pmc) {
2319 /* MCA not found?? bug */
2320 read_unlock_bh(&idev->lock);
2321 return -ESRCH;
2322 }
2323 spin_lock_bh(&pmc->mca_lock);
2324
2325 sf_markstate(pmc);
2326 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2327 if (!delta)
2328 pmc->mca_sfcount[sfmode]++;
2329 err = 0;
2330 for (i = 0; i < sfcount; i++) {
2331 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2332 if (err)
2333 break;
2334 }
2335 if (err) {
2336 int j;
2337
2338 if (!delta)
2339 pmc->mca_sfcount[sfmode]--;
2340 for (j = 0; j < i; j++)
2341 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2342 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2343 struct ip6_sf_list *psf;
2344
2345 /* filter mode change */
2346 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2347 pmc->mca_sfmode = MCAST_EXCLUDE;
2348 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2349 pmc->mca_sfmode = MCAST_INCLUDE;
2350 /* else no filters; keep old mode for reports */
2351
2352 pmc->mca_crcount = idev->mc_qrv;
2353 idev->mc_ifc_count = pmc->mca_crcount;
2354 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2355 psf->sf_crcount = 0;
2356 mld_ifc_event(idev);
2357 } else if (sf_setstate(pmc))
2358 mld_ifc_event(idev);
2359 spin_unlock_bh(&pmc->mca_lock);
2360 read_unlock_bh(&idev->lock);
2361 return err;
2362}
2363
2364static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2365{
2366 struct ip6_sf_list *psf, *nextpsf;
2367
2368 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2369 nextpsf = psf->sf_next;
2370 kfree(psf);
2371 }
2372 pmc->mca_tomb = NULL;
2373 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2374 nextpsf = psf->sf_next;
2375 kfree(psf);
2376 }
2377 pmc->mca_sources = NULL;
2378 pmc->mca_sfmode = MCAST_EXCLUDE;
2379 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2380 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2381}
2382
2383
2384static void igmp6_join_group(struct ifmcaddr6 *ma)
2385{
2386 unsigned long delay;
2387
2388 if (ma->mca_flags & MAF_NOREPORT)
2389 return;
2390
2391 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2392
2393 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2394
2395 spin_lock_bh(&ma->mca_lock);
2396 if (del_timer(&ma->mca_timer)) {
2397 refcount_dec(&ma->mca_refcnt);
2398 delay = ma->mca_timer.expires - jiffies;
2399 }
2400
2401 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2402 refcount_inc(&ma->mca_refcnt);
2403 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2404 spin_unlock_bh(&ma->mca_lock);
2405}
2406
2407static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2408 struct inet6_dev *idev)
2409{
2410 int err;
2411
2412 /* callers have the socket lock and rtnl lock
2413 * so no other readers or writers of iml or its sflist
2414 */
2415 if (!iml->sflist) {
2416 /* any-source empty exclude case */
2417 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2418 }
2419 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2420 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2421 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2422 iml->sflist = NULL;
2423 return err;
2424}
2425
2426static void igmp6_leave_group(struct ifmcaddr6 *ma)
2427{
2428 if (mld_in_v1_mode(ma->idev)) {
2429 if (ma->mca_flags & MAF_LAST_REPORTER)
2430 igmp6_send(&ma->mca_addr, ma->idev->dev,
2431 ICMPV6_MGM_REDUCTION);
2432 } else {
2433 mld_add_delrec(ma->idev, ma);
2434 mld_ifc_event(ma->idev);
2435 }
2436}
2437
2438static void mld_gq_timer_expire(struct timer_list *t)
2439{
2440 struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
2441
2442 idev->mc_gq_running = 0;
2443 mld_send_report(idev, NULL);
2444 in6_dev_put(idev);
2445}
2446
2447static void mld_ifc_timer_expire(struct timer_list *t)
2448{
2449 struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
2450
2451 mld_send_cr(idev);
2452 if (idev->mc_ifc_count) {
2453 idev->mc_ifc_count--;
2454 if (idev->mc_ifc_count)
2455 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2456 }
2457 in6_dev_put(idev);
2458}
2459
2460static void mld_ifc_event(struct inet6_dev *idev)
2461{
2462 if (mld_in_v1_mode(idev))
2463 return;
2464 idev->mc_ifc_count = idev->mc_qrv;
2465 mld_ifc_start_timer(idev, 1);
2466}
2467
2468static void igmp6_timer_handler(struct timer_list *t)
2469{
2470 struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
2471
2472 if (mld_in_v1_mode(ma->idev))
2473 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2474 else
2475 mld_send_report(ma->idev, ma);
2476
2477 spin_lock(&ma->mca_lock);
2478 ma->mca_flags |= MAF_LAST_REPORTER;
2479 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2480 spin_unlock(&ma->mca_lock);
2481 ma_put(ma);
2482}
2483
2484/* Device changing type */
2485
2486void ipv6_mc_unmap(struct inet6_dev *idev)
2487{
2488 struct ifmcaddr6 *i;
2489
2490 /* Install multicast list, except for all-nodes (already installed) */
2491
2492 read_lock_bh(&idev->lock);
2493 for (i = idev->mc_list; i; i = i->next)
2494 igmp6_group_dropped(i);
2495 read_unlock_bh(&idev->lock);
2496}
2497
2498void ipv6_mc_remap(struct inet6_dev *idev)
2499{
2500 ipv6_mc_up(idev);
2501}
2502
2503/* Device going down */
2504
2505void ipv6_mc_down(struct inet6_dev *idev)
2506{
2507 struct ifmcaddr6 *i;
2508
2509 /* Withdraw multicast list */
2510
2511 read_lock_bh(&idev->lock);
2512
2513 for (i = idev->mc_list; i; i = i->next)
2514 igmp6_group_dropped(i);
2515
2516 /* Should stop timer after group drop. or we will
2517 * start timer again in mld_ifc_event()
2518 */
2519 mld_ifc_stop_timer(idev);
2520 mld_gq_stop_timer(idev);
2521 mld_dad_stop_timer(idev);
2522 read_unlock_bh(&idev->lock);
2523}
2524
2525static void ipv6_mc_reset(struct inet6_dev *idev)
2526{
2527 idev->mc_qrv = sysctl_mld_qrv;
2528 idev->mc_qi = MLD_QI_DEFAULT;
2529 idev->mc_qri = MLD_QRI_DEFAULT;
2530 idev->mc_v1_seen = 0;
2531 idev->mc_maxdelay = unsolicited_report_interval(idev);
2532}
2533
2534/* Device going up */
2535
2536void ipv6_mc_up(struct inet6_dev *idev)
2537{
2538 struct ifmcaddr6 *i;
2539
2540 /* Install multicast list, except for all-nodes (already installed) */
2541
2542 read_lock_bh(&idev->lock);
2543 ipv6_mc_reset(idev);
2544 for (i = idev->mc_list; i; i = i->next) {
2545 mld_del_delrec(idev, i);
2546 igmp6_group_added(i);
2547 }
2548 read_unlock_bh(&idev->lock);
2549}
2550
2551/* IPv6 device initialization. */
2552
2553void ipv6_mc_init_dev(struct inet6_dev *idev)
2554{
2555 write_lock_bh(&idev->lock);
2556 spin_lock_init(&idev->mc_lock);
2557 idev->mc_gq_running = 0;
2558 timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
2559 idev->mc_tomb = NULL;
2560 idev->mc_ifc_count = 0;
2561 timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2562 timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2563 ipv6_mc_reset(idev);
2564 write_unlock_bh(&idev->lock);
2565}
2566
2567/*
2568 * Device is about to be destroyed: clean up.
2569 */
2570
2571void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2572{
2573 struct ifmcaddr6 *i;
2574
2575 /* Deactivate timers */
2576 ipv6_mc_down(idev);
2577 mld_clear_delrec(idev);
2578
2579 /* Delete all-nodes address. */
2580 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2581 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2582 * fail.
2583 */
2584 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2585
2586 if (idev->cnf.forwarding)
2587 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2588
2589 write_lock_bh(&idev->lock);
2590 while ((i = idev->mc_list) != NULL) {
2591 idev->mc_list = i->next;
2592
2593 write_unlock_bh(&idev->lock);
2594 ma_put(i);
2595 write_lock_bh(&idev->lock);
2596 }
2597 write_unlock_bh(&idev->lock);
2598}
2599
2600static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2601{
2602 struct ifmcaddr6 *pmc;
2603
2604 ASSERT_RTNL();
2605
2606 if (mld_in_v1_mode(idev)) {
2607 read_lock_bh(&idev->lock);
2608 for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2609 igmp6_join_group(pmc);
2610 read_unlock_bh(&idev->lock);
2611 } else
2612 mld_send_report(idev, NULL);
2613}
2614
2615static int ipv6_mc_netdev_event(struct notifier_block *this,
2616 unsigned long event,
2617 void *ptr)
2618{
2619 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2620 struct inet6_dev *idev = __in6_dev_get(dev);
2621
2622 switch (event) {
2623 case NETDEV_RESEND_IGMP:
2624 if (idev)
2625 ipv6_mc_rejoin_groups(idev);
2626 break;
2627 default:
2628 break;
2629 }
2630
2631 return NOTIFY_DONE;
2632}
2633
2634static struct notifier_block igmp6_netdev_notifier = {
2635 .notifier_call = ipv6_mc_netdev_event,
2636};
2637
2638#ifdef CONFIG_PROC_FS
2639struct igmp6_mc_iter_state {
2640 struct seq_net_private p;
2641 struct net_device *dev;
2642 struct inet6_dev *idev;
2643};
2644
2645#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2646
2647static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2648{
2649 struct ifmcaddr6 *im = NULL;
2650 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2651 struct net *net = seq_file_net(seq);
2652
2653 state->idev = NULL;
2654 for_each_netdev_rcu(net, state->dev) {
2655 struct inet6_dev *idev;
2656 idev = __in6_dev_get(state->dev);
2657 if (!idev)
2658 continue;
2659 read_lock_bh(&idev->lock);
2660 im = idev->mc_list;
2661 if (im) {
2662 state->idev = idev;
2663 break;
2664 }
2665 read_unlock_bh(&idev->lock);
2666 }
2667 return im;
2668}
2669
2670static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2671{
2672 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2673
2674 im = im->next;
2675 while (!im) {
2676 if (likely(state->idev))
2677 read_unlock_bh(&state->idev->lock);
2678
2679 state->dev = next_net_device_rcu(state->dev);
2680 if (!state->dev) {
2681 state->idev = NULL;
2682 break;
2683 }
2684 state->idev = __in6_dev_get(state->dev);
2685 if (!state->idev)
2686 continue;
2687 read_lock_bh(&state->idev->lock);
2688 im = state->idev->mc_list;
2689 }
2690 return im;
2691}
2692
2693static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2694{
2695 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2696 if (im)
2697 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2698 --pos;
2699 return pos ? NULL : im;
2700}
2701
2702static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2703 __acquires(RCU)
2704{
2705 rcu_read_lock();
2706 return igmp6_mc_get_idx(seq, *pos);
2707}
2708
2709static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2710{
2711 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2712
2713 ++*pos;
2714 return im;
2715}
2716
2717static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2718 __releases(RCU)
2719{
2720 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2721
2722 if (likely(state->idev)) {
2723 read_unlock_bh(&state->idev->lock);
2724 state->idev = NULL;
2725 }
2726 state->dev = NULL;
2727 rcu_read_unlock();
2728}
2729
2730static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2731{
2732 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2733 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2734
2735 seq_printf(seq,
2736 "%-4d %-15s %pi6 %5d %08X %ld\n",
2737 state->dev->ifindex, state->dev->name,
2738 &im->mca_addr,
2739 im->mca_users, im->mca_flags,
2740 (im->mca_flags&MAF_TIMER_RUNNING) ?
2741 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2742 return 0;
2743}
2744
2745static const struct seq_operations igmp6_mc_seq_ops = {
2746 .start = igmp6_mc_seq_start,
2747 .next = igmp6_mc_seq_next,
2748 .stop = igmp6_mc_seq_stop,
2749 .show = igmp6_mc_seq_show,
2750};
2751
2752static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2753{
2754 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2755 sizeof(struct igmp6_mc_iter_state));
2756}
2757
2758static const struct file_operations igmp6_mc_seq_fops = {
2759 .open = igmp6_mc_seq_open,
2760 .read = seq_read,
2761 .llseek = seq_lseek,
2762 .release = seq_release_net,
2763};
2764
2765struct igmp6_mcf_iter_state {
2766 struct seq_net_private p;
2767 struct net_device *dev;
2768 struct inet6_dev *idev;
2769 struct ifmcaddr6 *im;
2770};
2771
2772#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2773
2774static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2775{
2776 struct ip6_sf_list *psf = NULL;
2777 struct ifmcaddr6 *im = NULL;
2778 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2779 struct net *net = seq_file_net(seq);
2780
2781 state->idev = NULL;
2782 state->im = NULL;
2783 for_each_netdev_rcu(net, state->dev) {
2784 struct inet6_dev *idev;
2785 idev = __in6_dev_get(state->dev);
2786 if (unlikely(idev == NULL))
2787 continue;
2788 read_lock_bh(&idev->lock);
2789 im = idev->mc_list;
2790 if (likely(im)) {
2791 spin_lock_bh(&im->mca_lock);
2792 psf = im->mca_sources;
2793 if (likely(psf)) {
2794 state->im = im;
2795 state->idev = idev;
2796 break;
2797 }
2798 spin_unlock_bh(&im->mca_lock);
2799 }
2800 read_unlock_bh(&idev->lock);
2801 }
2802 return psf;
2803}
2804
2805static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2806{
2807 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2808
2809 psf = psf->sf_next;
2810 while (!psf) {
2811 spin_unlock_bh(&state->im->mca_lock);
2812 state->im = state->im->next;
2813 while (!state->im) {
2814 if (likely(state->idev))
2815 read_unlock_bh(&state->idev->lock);
2816
2817 state->dev = next_net_device_rcu(state->dev);
2818 if (!state->dev) {
2819 state->idev = NULL;
2820 goto out;
2821 }
2822 state->idev = __in6_dev_get(state->dev);
2823 if (!state->idev)
2824 continue;
2825 read_lock_bh(&state->idev->lock);
2826 state->im = state->idev->mc_list;
2827 }
2828 if (!state->im)
2829 break;
2830 spin_lock_bh(&state->im->mca_lock);
2831 psf = state->im->mca_sources;
2832 }
2833out:
2834 return psf;
2835}
2836
2837static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2838{
2839 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2840 if (psf)
2841 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2842 --pos;
2843 return pos ? NULL : psf;
2844}
2845
2846static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2847 __acquires(RCU)
2848{
2849 rcu_read_lock();
2850 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2851}
2852
2853static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2854{
2855 struct ip6_sf_list *psf;
2856 if (v == SEQ_START_TOKEN)
2857 psf = igmp6_mcf_get_first(seq);
2858 else
2859 psf = igmp6_mcf_get_next(seq, v);
2860 ++*pos;
2861 return psf;
2862}
2863
2864static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2865 __releases(RCU)
2866{
2867 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2868 if (likely(state->im)) {
2869 spin_unlock_bh(&state->im->mca_lock);
2870 state->im = NULL;
2871 }
2872 if (likely(state->idev)) {
2873 read_unlock_bh(&state->idev->lock);
2874 state->idev = NULL;
2875 }
2876 state->dev = NULL;
2877 rcu_read_unlock();
2878}
2879
2880static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2881{
2882 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2883 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2884
2885 if (v == SEQ_START_TOKEN) {
2886 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2887 } else {
2888 seq_printf(seq,
2889 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2890 state->dev->ifindex, state->dev->name,
2891 &state->im->mca_addr,
2892 &psf->sf_addr,
2893 psf->sf_count[MCAST_INCLUDE],
2894 psf->sf_count[MCAST_EXCLUDE]);
2895 }
2896 return 0;
2897}
2898
2899static const struct seq_operations igmp6_mcf_seq_ops = {
2900 .start = igmp6_mcf_seq_start,
2901 .next = igmp6_mcf_seq_next,
2902 .stop = igmp6_mcf_seq_stop,
2903 .show = igmp6_mcf_seq_show,
2904};
2905
2906static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2907{
2908 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2909 sizeof(struct igmp6_mcf_iter_state));
2910}
2911
2912static const struct file_operations igmp6_mcf_seq_fops = {
2913 .open = igmp6_mcf_seq_open,
2914 .read = seq_read,
2915 .llseek = seq_lseek,
2916 .release = seq_release_net,
2917};
2918
2919static int __net_init igmp6_proc_init(struct net *net)
2920{
2921 int err;
2922
2923 err = -ENOMEM;
2924 if (!proc_create("igmp6", 0444, net->proc_net, &igmp6_mc_seq_fops))
2925 goto out;
2926 if (!proc_create("mcfilter6", 0444, net->proc_net,
2927 &igmp6_mcf_seq_fops))
2928 goto out_proc_net_igmp6;
2929
2930 err = 0;
2931out:
2932 return err;
2933
2934out_proc_net_igmp6:
2935 remove_proc_entry("igmp6", net->proc_net);
2936 goto out;
2937}
2938
2939static void __net_exit igmp6_proc_exit(struct net *net)
2940{
2941 remove_proc_entry("mcfilter6", net->proc_net);
2942 remove_proc_entry("igmp6", net->proc_net);
2943}
2944#else
2945static inline int igmp6_proc_init(struct net *net)
2946{
2947 return 0;
2948}
2949static inline void igmp6_proc_exit(struct net *net)
2950{
2951}
2952#endif
2953
2954static int __net_init igmp6_net_init(struct net *net)
2955{
2956 int err;
2957
2958 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2959 SOCK_RAW, IPPROTO_ICMPV6, net);
2960 if (err < 0) {
2961 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2962 err);
2963 goto out;
2964 }
2965
2966 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2967
2968 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2969 SOCK_RAW, IPPROTO_ICMPV6, net);
2970 if (err < 0) {
2971 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2972 err);
2973 goto out_sock_create;
2974 }
2975
2976 err = igmp6_proc_init(net);
2977 if (err)
2978 goto out_sock_create_autojoin;
2979
2980 return 0;
2981
2982out_sock_create_autojoin:
2983 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2984out_sock_create:
2985 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2986out:
2987 return err;
2988}
2989
2990static void __net_exit igmp6_net_exit(struct net *net)
2991{
2992 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2993 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2994 igmp6_proc_exit(net);
2995}
2996
2997static struct pernet_operations igmp6_net_ops = {
2998 .init = igmp6_net_init,
2999 .exit = igmp6_net_exit,
3000};
3001
3002int __init igmp6_init(void)
3003{
3004 return register_pernet_subsys(&igmp6_net_ops);
3005}
3006
3007int __init igmp6_late_init(void)
3008{
3009 return register_netdevice_notifier(&igmp6_netdev_notifier);
3010}
3011
3012void igmp6_cleanup(void)
3013{
3014 unregister_pernet_subsys(&igmp6_net_ops);
3015}
3016
3017void igmp6_late_cleanup(void)
3018{
3019 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3020}