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