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