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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 <net/mld.h>
48
49#include <linux/netfilter.h>
50#include <linux/netfilter_ipv6.h>
51
52#include <net/net_namespace.h>
53#include <net/sock.h>
54#include <net/snmp.h>
55
56#include <net/ipv6.h>
57#include <net/protocol.h>
58#include <net/if_inet6.h>
59#include <net/ndisc.h>
60#include <net/addrconf.h>
61#include <net/ip6_route.h>
62#include <net/inet_common.h>
63
64#include <net/ip6_checksum.h>
65
66/* Set to 3 to get tracing... */
67#define MCAST_DEBUG 2
68
69#if MCAST_DEBUG >= 3
70#define MDBG(x) printk x
71#else
72#define MDBG(x)
73#endif
74
75/* Ensure that we have struct in6_addr aligned on 32bit word. */
76static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
77 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
80};
81
82static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
83
84/* Big mc list lock for all the sockets */
85static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
86
87static void igmp6_join_group(struct ifmcaddr6 *ma);
88static void igmp6_leave_group(struct ifmcaddr6 *ma);
89static void igmp6_timer_handler(unsigned long data);
90
91static void mld_gq_timer_expire(unsigned long data);
92static void mld_ifc_timer_expire(unsigned long data);
93static void mld_ifc_event(struct inet6_dev *idev);
94static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
95static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
96static void mld_clear_delrec(struct inet6_dev *idev);
97static int sf_setstate(struct ifmcaddr6 *pmc);
98static void sf_markstate(struct ifmcaddr6 *pmc);
99static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
100static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
101 int sfmode, int sfcount, const struct in6_addr *psfsrc,
102 int delta);
103static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
104 int sfmode, int sfcount, const struct in6_addr *psfsrc,
105 int delta);
106static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107 struct inet6_dev *idev);
108
109
110#define IGMP6_UNSOLICITED_IVAL (10*HZ)
111#define MLD_QRV_DEFAULT 2
112
113#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
114 (idev)->cnf.force_mld_version == 1 || \
115 ((idev)->mc_v1_seen && \
116 time_before(jiffies, (idev)->mc_v1_seen)))
117
118#define IPV6_MLD_MAX_MSF 64
119
120int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
121
122/*
123 * socket join on multicast group
124 */
125
126#define for_each_pmc_rcu(np, pmc) \
127 for (pmc = rcu_dereference(np->ipv6_mc_list); \
128 pmc != NULL; \
129 pmc = rcu_dereference(pmc->next))
130
131int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
132{
133 struct net_device *dev = NULL;
134 struct ipv6_mc_socklist *mc_lst;
135 struct ipv6_pinfo *np = inet6_sk(sk);
136 struct net *net = sock_net(sk);
137 int err;
138
139 if (!ipv6_addr_is_multicast(addr))
140 return -EINVAL;
141
142 rcu_read_lock();
143 for_each_pmc_rcu(np, mc_lst) {
144 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145 ipv6_addr_equal(&mc_lst->addr, addr)) {
146 rcu_read_unlock();
147 return -EADDRINUSE;
148 }
149 }
150 rcu_read_unlock();
151
152 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
153
154 if (mc_lst == NULL)
155 return -ENOMEM;
156
157 mc_lst->next = NULL;
158 mc_lst->addr = *addr;
159
160 rcu_read_lock();
161 if (ifindex == 0) {
162 struct rt6_info *rt;
163 rt = rt6_lookup(net, addr, NULL, 0, 0);
164 if (rt) {
165 dev = rt->dst.dev;
166 dst_release(&rt->dst);
167 }
168 } else
169 dev = dev_get_by_index_rcu(net, ifindex);
170
171 if (dev == NULL) {
172 rcu_read_unlock();
173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174 return -ENODEV;
175 }
176
177 mc_lst->ifindex = dev->ifindex;
178 mc_lst->sfmode = MCAST_EXCLUDE;
179 rwlock_init(&mc_lst->sflock);
180 mc_lst->sflist = NULL;
181
182 /*
183 * now add/increase the group membership on the device
184 */
185
186 err = ipv6_dev_mc_inc(dev, addr);
187
188 if (err) {
189 rcu_read_unlock();
190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191 return err;
192 }
193
194 spin_lock(&ipv6_sk_mc_lock);
195 mc_lst->next = np->ipv6_mc_list;
196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 spin_unlock(&ipv6_sk_mc_lock);
198
199 rcu_read_unlock();
200
201 return 0;
202}
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 spin_lock(&ipv6_sk_mc_lock);
215 for (lnk = &np->ipv6_mc_list;
216 (mc_lst = rcu_dereference_protected(*lnk,
217 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
218 lnk = &mc_lst->next) {
219 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
220 ipv6_addr_equal(&mc_lst->addr, addr)) {
221 struct net_device *dev;
222
223 *lnk = mc_lst->next;
224 spin_unlock(&ipv6_sk_mc_lock);
225
226 rcu_read_lock();
227 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
228 if (dev != NULL) {
229 struct inet6_dev *idev = __in6_dev_get(dev);
230
231 (void) ip6_mc_leave_src(sk, mc_lst, idev);
232 if (idev)
233 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
234 } else
235 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
236 rcu_read_unlock();
237 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
238 kfree_rcu(mc_lst, rcu);
239 return 0;
240 }
241 }
242 spin_unlock(&ipv6_sk_mc_lock);
243
244 return -EADDRNOTAVAIL;
245}
246
247/* called with rcu_read_lock() */
248static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
249 const struct in6_addr *group,
250 int ifindex)
251{
252 struct net_device *dev = NULL;
253 struct inet6_dev *idev = NULL;
254
255 if (ifindex == 0) {
256 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
257
258 if (rt) {
259 dev = rt->dst.dev;
260 dst_release(&rt->dst);
261 }
262 } else
263 dev = dev_get_by_index_rcu(net, ifindex);
264
265 if (!dev)
266 return NULL;
267 idev = __in6_dev_get(dev);
268 if (!idev)
269 return NULL;
270 read_lock_bh(&idev->lock);
271 if (idev->dead) {
272 read_unlock_bh(&idev->lock);
273 return NULL;
274 }
275 return idev;
276}
277
278void ipv6_sock_mc_close(struct sock *sk)
279{
280 struct ipv6_pinfo *np = inet6_sk(sk);
281 struct ipv6_mc_socklist *mc_lst;
282 struct net *net = sock_net(sk);
283
284 spin_lock(&ipv6_sk_mc_lock);
285 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
286 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
287 struct net_device *dev;
288
289 np->ipv6_mc_list = mc_lst->next;
290 spin_unlock(&ipv6_sk_mc_lock);
291
292 rcu_read_lock();
293 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
294 if (dev) {
295 struct inet6_dev *idev = __in6_dev_get(dev);
296
297 (void) ip6_mc_leave_src(sk, mc_lst, idev);
298 if (idev)
299 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
300 } else
301 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
302 rcu_read_unlock();
303
304 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
305 kfree_rcu(mc_lst, rcu);
306
307 spin_lock(&ipv6_sk_mc_lock);
308 }
309 spin_unlock(&ipv6_sk_mc_lock);
310}
311
312int ip6_mc_source(int add, int omode, struct sock *sk,
313 struct group_source_req *pgsr)
314{
315 struct in6_addr *source, *group;
316 struct ipv6_mc_socklist *pmc;
317 struct inet6_dev *idev;
318 struct ipv6_pinfo *inet6 = inet6_sk(sk);
319 struct ip6_sf_socklist *psl;
320 struct net *net = sock_net(sk);
321 int i, j, rv;
322 int leavegroup = 0;
323 int pmclocked = 0;
324 int err;
325
326 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
327 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
328
329 if (!ipv6_addr_is_multicast(group))
330 return -EINVAL;
331
332 rcu_read_lock();
333 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
334 if (!idev) {
335 rcu_read_unlock();
336 return -ENODEV;
337 }
338
339 err = -EADDRNOTAVAIL;
340
341 for_each_pmc_rcu(inet6, pmc) {
342 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
343 continue;
344 if (ipv6_addr_equal(&pmc->addr, group))
345 break;
346 }
347 if (!pmc) { /* must have a prior join */
348 err = -EINVAL;
349 goto done;
350 }
351 /* if a source filter was set, must be the same mode as before */
352 if (pmc->sflist) {
353 if (pmc->sfmode != omode) {
354 err = -EINVAL;
355 goto done;
356 }
357 } else if (pmc->sfmode != omode) {
358 /* allow mode switches for empty-set filters */
359 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
360 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
361 pmc->sfmode = omode;
362 }
363
364 write_lock(&pmc->sflock);
365 pmclocked = 1;
366
367 psl = pmc->sflist;
368 if (!add) {
369 if (!psl)
370 goto done; /* err = -EADDRNOTAVAIL */
371 rv = !0;
372 for (i=0; i<psl->sl_count; i++) {
373 rv = memcmp(&psl->sl_addr[i], source,
374 sizeof(struct in6_addr));
375 if (rv == 0)
376 break;
377 }
378 if (rv) /* source not found */
379 goto done; /* err = -EADDRNOTAVAIL */
380
381 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
382 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
383 leavegroup = 1;
384 goto done;
385 }
386
387 /* update the interface filter */
388 ip6_mc_del_src(idev, group, omode, 1, source, 1);
389
390 for (j=i+1; j<psl->sl_count; j++)
391 psl->sl_addr[j-1] = psl->sl_addr[j];
392 psl->sl_count--;
393 err = 0;
394 goto done;
395 }
396 /* else, add a new source to the filter */
397
398 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
399 err = -ENOBUFS;
400 goto done;
401 }
402 if (!psl || psl->sl_count == psl->sl_max) {
403 struct ip6_sf_socklist *newpsl;
404 int count = IP6_SFBLOCK;
405
406 if (psl)
407 count += psl->sl_max;
408 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
409 if (!newpsl) {
410 err = -ENOBUFS;
411 goto done;
412 }
413 newpsl->sl_max = count;
414 newpsl->sl_count = count - IP6_SFBLOCK;
415 if (psl) {
416 for (i=0; i<psl->sl_count; i++)
417 newpsl->sl_addr[i] = psl->sl_addr[i];
418 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
419 }
420 pmc->sflist = psl = newpsl;
421 }
422 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
423 for (i=0; i<psl->sl_count; i++) {
424 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
425 if (rv == 0)
426 break;
427 }
428 if (rv == 0) /* address already there is an error */
429 goto done;
430 for (j=psl->sl_count-1; j>=i; j--)
431 psl->sl_addr[j+1] = psl->sl_addr[j];
432 psl->sl_addr[i] = *source;
433 psl->sl_count++;
434 err = 0;
435 /* update the interface list */
436 ip6_mc_add_src(idev, group, omode, 1, source, 1);
437done:
438 if (pmclocked)
439 write_unlock(&pmc->sflock);
440 read_unlock_bh(&idev->lock);
441 rcu_read_unlock();
442 if (leavegroup)
443 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
444 return err;
445}
446
447int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
448{
449 const struct in6_addr *group;
450 struct ipv6_mc_socklist *pmc;
451 struct inet6_dev *idev;
452 struct ipv6_pinfo *inet6 = inet6_sk(sk);
453 struct ip6_sf_socklist *newpsl, *psl;
454 struct net *net = sock_net(sk);
455 int leavegroup = 0;
456 int i, err;
457
458 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
459
460 if (!ipv6_addr_is_multicast(group))
461 return -EINVAL;
462 if (gsf->gf_fmode != MCAST_INCLUDE &&
463 gsf->gf_fmode != MCAST_EXCLUDE)
464 return -EINVAL;
465
466 rcu_read_lock();
467 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
468
469 if (!idev) {
470 rcu_read_unlock();
471 return -ENODEV;
472 }
473
474 err = 0;
475
476 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
477 leavegroup = 1;
478 goto done;
479 }
480
481 for_each_pmc_rcu(inet6, pmc) {
482 if (pmc->ifindex != gsf->gf_interface)
483 continue;
484 if (ipv6_addr_equal(&pmc->addr, group))
485 break;
486 }
487 if (!pmc) { /* must have a prior join */
488 err = -EINVAL;
489 goto done;
490 }
491 if (gsf->gf_numsrc) {
492 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
493 GFP_ATOMIC);
494 if (!newpsl) {
495 err = -ENOBUFS;
496 goto done;
497 }
498 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
499 for (i=0; i<newpsl->sl_count; ++i) {
500 struct sockaddr_in6 *psin6;
501
502 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
503 newpsl->sl_addr[i] = psin6->sin6_addr;
504 }
505 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
506 newpsl->sl_count, newpsl->sl_addr, 0);
507 if (err) {
508 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
509 goto done;
510 }
511 } else {
512 newpsl = NULL;
513 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
514 }
515
516 write_lock(&pmc->sflock);
517 psl = pmc->sflist;
518 if (psl) {
519 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
520 psl->sl_count, psl->sl_addr, 0);
521 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
522 } else
523 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
524 pmc->sflist = newpsl;
525 pmc->sfmode = gsf->gf_fmode;
526 write_unlock(&pmc->sflock);
527 err = 0;
528done:
529 read_unlock_bh(&idev->lock);
530 rcu_read_unlock();
531 if (leavegroup)
532 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
533 return err;
534}
535
536int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
537 struct group_filter __user *optval, int __user *optlen)
538{
539 int err, i, count, copycount;
540 const struct in6_addr *group;
541 struct ipv6_mc_socklist *pmc;
542 struct inet6_dev *idev;
543 struct ipv6_pinfo *inet6 = inet6_sk(sk);
544 struct ip6_sf_socklist *psl;
545 struct net *net = sock_net(sk);
546
547 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
548
549 if (!ipv6_addr_is_multicast(group))
550 return -EINVAL;
551
552 rcu_read_lock();
553 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
554
555 if (!idev) {
556 rcu_read_unlock();
557 return -ENODEV;
558 }
559
560 err = -EADDRNOTAVAIL;
561 /*
562 * changes to the ipv6_mc_list require the socket lock and
563 * a read lock on ip6_sk_mc_lock. We have the socket lock,
564 * so reading the list is safe.
565 */
566
567 for_each_pmc_rcu(inet6, pmc) {
568 if (pmc->ifindex != gsf->gf_interface)
569 continue;
570 if (ipv6_addr_equal(group, &pmc->addr))
571 break;
572 }
573 if (!pmc) /* must have a prior join */
574 goto done;
575 gsf->gf_fmode = pmc->sfmode;
576 psl = pmc->sflist;
577 count = psl ? psl->sl_count : 0;
578 read_unlock_bh(&idev->lock);
579 rcu_read_unlock();
580
581 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
582 gsf->gf_numsrc = count;
583 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
584 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
585 return -EFAULT;
586 }
587 /* changes to psl require the socket lock, a read lock on
588 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
589 * have the socket lock, so reading here is safe.
590 */
591 for (i=0; i<copycount; i++) {
592 struct sockaddr_in6 *psin6;
593 struct sockaddr_storage ss;
594
595 psin6 = (struct sockaddr_in6 *)&ss;
596 memset(&ss, 0, sizeof(ss));
597 psin6->sin6_family = AF_INET6;
598 psin6->sin6_addr = psl->sl_addr[i];
599 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
600 return -EFAULT;
601 }
602 return 0;
603done:
604 read_unlock_bh(&idev->lock);
605 rcu_read_unlock();
606 return err;
607}
608
609bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
610 const struct in6_addr *src_addr)
611{
612 struct ipv6_pinfo *np = inet6_sk(sk);
613 struct ipv6_mc_socklist *mc;
614 struct ip6_sf_socklist *psl;
615 bool rv = true;
616
617 rcu_read_lock();
618 for_each_pmc_rcu(np, mc) {
619 if (ipv6_addr_equal(&mc->addr, mc_addr))
620 break;
621 }
622 if (!mc) {
623 rcu_read_unlock();
624 return true;
625 }
626 read_lock(&mc->sflock);
627 psl = mc->sflist;
628 if (!psl) {
629 rv = mc->sfmode == MCAST_EXCLUDE;
630 } else {
631 int i;
632
633 for (i=0; i<psl->sl_count; i++) {
634 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
635 break;
636 }
637 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
638 rv = false;
639 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
640 rv = false;
641 }
642 read_unlock(&mc->sflock);
643 rcu_read_unlock();
644
645 return rv;
646}
647
648static void ma_put(struct ifmcaddr6 *mc)
649{
650 if (atomic_dec_and_test(&mc->mca_refcnt)) {
651 in6_dev_put(mc->idev);
652 kfree(mc);
653 }
654}
655
656static void igmp6_group_added(struct ifmcaddr6 *mc)
657{
658 struct net_device *dev = mc->idev->dev;
659 char buf[MAX_ADDR_LEN];
660
661 spin_lock_bh(&mc->mca_lock);
662 if (!(mc->mca_flags&MAF_LOADED)) {
663 mc->mca_flags |= MAF_LOADED;
664 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
665 dev_mc_add(dev, buf);
666 }
667 spin_unlock_bh(&mc->mca_lock);
668
669 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
670 return;
671
672 if (MLD_V1_SEEN(mc->idev)) {
673 igmp6_join_group(mc);
674 return;
675 }
676 /* else v2 */
677
678 mc->mca_crcount = mc->idev->mc_qrv;
679 mld_ifc_event(mc->idev);
680}
681
682static void igmp6_group_dropped(struct ifmcaddr6 *mc)
683{
684 struct net_device *dev = mc->idev->dev;
685 char buf[MAX_ADDR_LEN];
686
687 spin_lock_bh(&mc->mca_lock);
688 if (mc->mca_flags&MAF_LOADED) {
689 mc->mca_flags &= ~MAF_LOADED;
690 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
691 dev_mc_del(dev, buf);
692 }
693
694 if (mc->mca_flags & MAF_NOREPORT)
695 goto done;
696 spin_unlock_bh(&mc->mca_lock);
697
698 if (!mc->idev->dead)
699 igmp6_leave_group(mc);
700
701 spin_lock_bh(&mc->mca_lock);
702 if (del_timer(&mc->mca_timer))
703 atomic_dec(&mc->mca_refcnt);
704done:
705 ip6_mc_clear_src(mc);
706 spin_unlock_bh(&mc->mca_lock);
707}
708
709/*
710 * deleted ifmcaddr6 manipulation
711 */
712static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
713{
714 struct ifmcaddr6 *pmc;
715
716 /* this is an "ifmcaddr6" for convenience; only the fields below
717 * are actually used. In particular, the refcnt and users are not
718 * used for management of the delete list. Using the same structure
719 * for deleted items allows change reports to use common code with
720 * non-deleted or query-response MCA's.
721 */
722 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
723 if (!pmc)
724 return;
725
726 spin_lock_bh(&im->mca_lock);
727 spin_lock_init(&pmc->mca_lock);
728 pmc->idev = im->idev;
729 in6_dev_hold(idev);
730 pmc->mca_addr = im->mca_addr;
731 pmc->mca_crcount = idev->mc_qrv;
732 pmc->mca_sfmode = im->mca_sfmode;
733 if (pmc->mca_sfmode == MCAST_INCLUDE) {
734 struct ip6_sf_list *psf;
735
736 pmc->mca_tomb = im->mca_tomb;
737 pmc->mca_sources = im->mca_sources;
738 im->mca_tomb = im->mca_sources = NULL;
739 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
740 psf->sf_crcount = pmc->mca_crcount;
741 }
742 spin_unlock_bh(&im->mca_lock);
743
744 spin_lock_bh(&idev->mc_lock);
745 pmc->next = idev->mc_tomb;
746 idev->mc_tomb = pmc;
747 spin_unlock_bh(&idev->mc_lock);
748}
749
750static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
751{
752 struct ifmcaddr6 *pmc, *pmc_prev;
753 struct ip6_sf_list *psf, *psf_next;
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 if (pmc) {
771 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
772 psf_next = psf->sf_next;
773 kfree(psf);
774 }
775 in6_dev_put(pmc->idev);
776 kfree(pmc);
777 }
778}
779
780static void mld_clear_delrec(struct inet6_dev *idev)
781{
782 struct ifmcaddr6 *pmc, *nextpmc;
783
784 spin_lock_bh(&idev->mc_lock);
785 pmc = idev->mc_tomb;
786 idev->mc_tomb = NULL;
787 spin_unlock_bh(&idev->mc_lock);
788
789 for (; pmc; pmc = nextpmc) {
790 nextpmc = pmc->next;
791 ip6_mc_clear_src(pmc);
792 in6_dev_put(pmc->idev);
793 kfree(pmc);
794 }
795
796 /* clear dead sources, too */
797 read_lock_bh(&idev->lock);
798 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
799 struct ip6_sf_list *psf, *psf_next;
800
801 spin_lock_bh(&pmc->mca_lock);
802 psf = pmc->mca_tomb;
803 pmc->mca_tomb = NULL;
804 spin_unlock_bh(&pmc->mca_lock);
805 for (; psf; psf=psf_next) {
806 psf_next = psf->sf_next;
807 kfree(psf);
808 }
809 }
810 read_unlock_bh(&idev->lock);
811}
812
813
814/*
815 * device multicast group inc (add if not found)
816 */
817int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
818{
819 struct ifmcaddr6 *mc;
820 struct inet6_dev *idev;
821
822 /* we need to take a reference on idev */
823 idev = in6_dev_get(dev);
824
825 if (idev == NULL)
826 return -EINVAL;
827
828 write_lock_bh(&idev->lock);
829 if (idev->dead) {
830 write_unlock_bh(&idev->lock);
831 in6_dev_put(idev);
832 return -ENODEV;
833 }
834
835 for (mc = idev->mc_list; mc; mc = mc->next) {
836 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
837 mc->mca_users++;
838 write_unlock_bh(&idev->lock);
839 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
840 NULL, 0);
841 in6_dev_put(idev);
842 return 0;
843 }
844 }
845
846 /*
847 * not found: create a new one.
848 */
849
850 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
851
852 if (mc == NULL) {
853 write_unlock_bh(&idev->lock);
854 in6_dev_put(idev);
855 return -ENOMEM;
856 }
857
858 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
859
860 mc->mca_addr = *addr;
861 mc->idev = idev; /* (reference taken) */
862 mc->mca_users = 1;
863 /* mca_stamp should be updated upon changes */
864 mc->mca_cstamp = mc->mca_tstamp = jiffies;
865 atomic_set(&mc->mca_refcnt, 2);
866 spin_lock_init(&mc->mca_lock);
867
868 /* initial mode is (EX, empty) */
869 mc->mca_sfmode = MCAST_EXCLUDE;
870 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
871
872 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
873 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
874 mc->mca_flags |= MAF_NOREPORT;
875
876 mc->next = idev->mc_list;
877 idev->mc_list = mc;
878 write_unlock_bh(&idev->lock);
879
880 mld_del_delrec(idev, &mc->mca_addr);
881 igmp6_group_added(mc);
882 ma_put(mc);
883 return 0;
884}
885
886/*
887 * device multicast group del
888 */
889int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
890{
891 struct ifmcaddr6 *ma, **map;
892
893 write_lock_bh(&idev->lock);
894 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
895 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
896 if (--ma->mca_users == 0) {
897 *map = ma->next;
898 write_unlock_bh(&idev->lock);
899
900 igmp6_group_dropped(ma);
901
902 ma_put(ma);
903 return 0;
904 }
905 write_unlock_bh(&idev->lock);
906 return 0;
907 }
908 }
909 write_unlock_bh(&idev->lock);
910
911 return -ENOENT;
912}
913
914int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
915{
916 struct inet6_dev *idev;
917 int err;
918
919 rcu_read_lock();
920
921 idev = __in6_dev_get(dev);
922 if (!idev)
923 err = -ENODEV;
924 else
925 err = __ipv6_dev_mc_dec(idev, addr);
926
927 rcu_read_unlock();
928 return err;
929}
930
931/*
932 * identify MLD packets for MLD filter exceptions
933 */
934bool ipv6_is_mld(struct sk_buff *skb, int nexthdr)
935{
936 struct icmp6hdr *pic;
937
938 if (nexthdr != IPPROTO_ICMPV6)
939 return false;
940
941 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
942 return false;
943
944 pic = icmp6_hdr(skb);
945
946 switch (pic->icmp6_type) {
947 case ICMPV6_MGM_QUERY:
948 case ICMPV6_MGM_REPORT:
949 case ICMPV6_MGM_REDUCTION:
950 case ICMPV6_MLD2_REPORT:
951 return true;
952 default:
953 break;
954 }
955 return false;
956}
957
958/*
959 * check if the interface/address pair is valid
960 */
961bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
962 const struct in6_addr *src_addr)
963{
964 struct inet6_dev *idev;
965 struct ifmcaddr6 *mc;
966 bool rv = false;
967
968 rcu_read_lock();
969 idev = __in6_dev_get(dev);
970 if (idev) {
971 read_lock_bh(&idev->lock);
972 for (mc = idev->mc_list; mc; mc=mc->next) {
973 if (ipv6_addr_equal(&mc->mca_addr, group))
974 break;
975 }
976 if (mc) {
977 if (src_addr && !ipv6_addr_any(src_addr)) {
978 struct ip6_sf_list *psf;
979
980 spin_lock_bh(&mc->mca_lock);
981 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
982 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
983 break;
984 }
985 if (psf)
986 rv = psf->sf_count[MCAST_INCLUDE] ||
987 psf->sf_count[MCAST_EXCLUDE] !=
988 mc->mca_sfcount[MCAST_EXCLUDE];
989 else
990 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
991 spin_unlock_bh(&mc->mca_lock);
992 } else
993 rv = true; /* don't filter unspecified source */
994 }
995 read_unlock_bh(&idev->lock);
996 }
997 rcu_read_unlock();
998 return rv;
999}
1000
1001static void mld_gq_start_timer(struct inet6_dev *idev)
1002{
1003 int tv = net_random() % idev->mc_maxdelay;
1004
1005 idev->mc_gq_running = 1;
1006 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1007 in6_dev_hold(idev);
1008}
1009
1010static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1011{
1012 int tv = net_random() % delay;
1013
1014 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1015 in6_dev_hold(idev);
1016}
1017
1018/*
1019 * IGMP handling (alias multicast ICMPv6 messages)
1020 */
1021
1022static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1023{
1024 unsigned long delay = resptime;
1025
1026 /* Do not start timer for these addresses */
1027 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1028 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1029 return;
1030
1031 if (del_timer(&ma->mca_timer)) {
1032 atomic_dec(&ma->mca_refcnt);
1033 delay = ma->mca_timer.expires - jiffies;
1034 }
1035
1036 if (delay >= resptime) {
1037 if (resptime)
1038 delay = net_random() % resptime;
1039 else
1040 delay = 1;
1041 }
1042 ma->mca_timer.expires = jiffies + delay;
1043 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1044 atomic_inc(&ma->mca_refcnt);
1045 ma->mca_flags |= MAF_TIMER_RUNNING;
1046}
1047
1048/* mark EXCLUDE-mode sources */
1049static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1050 const struct in6_addr *srcs)
1051{
1052 struct ip6_sf_list *psf;
1053 int i, scount;
1054
1055 scount = 0;
1056 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1057 if (scount == nsrcs)
1058 break;
1059 for (i=0; i<nsrcs; i++) {
1060 /* skip inactive filters */
1061 if (psf->sf_count[MCAST_INCLUDE] ||
1062 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1063 psf->sf_count[MCAST_EXCLUDE])
1064 break;
1065 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1066 scount++;
1067 break;
1068 }
1069 }
1070 }
1071 pmc->mca_flags &= ~MAF_GSQUERY;
1072 if (scount == nsrcs) /* all sources excluded */
1073 return false;
1074 return true;
1075}
1076
1077static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1078 const struct in6_addr *srcs)
1079{
1080 struct ip6_sf_list *psf;
1081 int i, scount;
1082
1083 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1084 return mld_xmarksources(pmc, nsrcs, srcs);
1085
1086 /* mark INCLUDE-mode sources */
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 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1094 psf->sf_gsresp = 1;
1095 scount++;
1096 break;
1097 }
1098 }
1099 }
1100 if (!scount) {
1101 pmc->mca_flags &= ~MAF_GSQUERY;
1102 return false;
1103 }
1104 pmc->mca_flags |= MAF_GSQUERY;
1105 return true;
1106}
1107
1108/* called with rcu_read_lock() */
1109int igmp6_event_query(struct sk_buff *skb)
1110{
1111 struct mld2_query *mlh2 = NULL;
1112 struct ifmcaddr6 *ma;
1113 const struct in6_addr *group;
1114 unsigned long max_delay;
1115 struct inet6_dev *idev;
1116 struct mld_msg *mld;
1117 int group_type;
1118 int mark = 0;
1119 int len;
1120
1121 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1122 return -EINVAL;
1123
1124 /* compute payload length excluding extension headers */
1125 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1126 len -= skb_network_header_len(skb);
1127
1128 /* Drop queries with not link local source */
1129 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1130 return -EINVAL;
1131
1132 idev = __in6_dev_get(skb->dev);
1133
1134 if (idev == NULL)
1135 return 0;
1136
1137 mld = (struct mld_msg *)icmp6_hdr(skb);
1138 group = &mld->mld_mca;
1139 group_type = ipv6_addr_type(group);
1140
1141 if (group_type != IPV6_ADDR_ANY &&
1142 !(group_type&IPV6_ADDR_MULTICAST))
1143 return -EINVAL;
1144
1145 if (len == 24) {
1146 int switchback;
1147 /* MLDv1 router present */
1148
1149 /* Translate milliseconds to jiffies */
1150 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1151
1152 switchback = (idev->mc_qrv + 1) * max_delay;
1153 idev->mc_v1_seen = jiffies + switchback;
1154
1155 /* cancel the interface change timer */
1156 idev->mc_ifc_count = 0;
1157 if (del_timer(&idev->mc_ifc_timer))
1158 __in6_dev_put(idev);
1159 /* clear deleted report items */
1160 mld_clear_delrec(idev);
1161 } else if (len >= 28) {
1162 int srcs_offset = sizeof(struct mld2_query) -
1163 sizeof(struct icmp6hdr);
1164 if (!pskb_may_pull(skb, srcs_offset))
1165 return -EINVAL;
1166
1167 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1168 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1169 if (!max_delay)
1170 max_delay = 1;
1171 idev->mc_maxdelay = max_delay;
1172 if (mlh2->mld2q_qrv)
1173 idev->mc_qrv = mlh2->mld2q_qrv;
1174 if (group_type == IPV6_ADDR_ANY) { /* general query */
1175 if (mlh2->mld2q_nsrcs)
1176 return -EINVAL; /* no sources allowed */
1177
1178 mld_gq_start_timer(idev);
1179 return 0;
1180 }
1181 /* mark sources to include, if group & source-specific */
1182 if (mlh2->mld2q_nsrcs != 0) {
1183 if (!pskb_may_pull(skb, srcs_offset +
1184 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1185 return -EINVAL;
1186
1187 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1188 mark = 1;
1189 }
1190 } else
1191 return -EINVAL;
1192
1193 read_lock_bh(&idev->lock);
1194 if (group_type == IPV6_ADDR_ANY) {
1195 for (ma = idev->mc_list; ma; ma=ma->next) {
1196 spin_lock_bh(&ma->mca_lock);
1197 igmp6_group_queried(ma, max_delay);
1198 spin_unlock_bh(&ma->mca_lock);
1199 }
1200 } else {
1201 for (ma = idev->mc_list; ma; ma=ma->next) {
1202 if (!ipv6_addr_equal(group, &ma->mca_addr))
1203 continue;
1204 spin_lock_bh(&ma->mca_lock);
1205 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1206 /* gsquery <- gsquery && mark */
1207 if (!mark)
1208 ma->mca_flags &= ~MAF_GSQUERY;
1209 } else {
1210 /* gsquery <- mark */
1211 if (mark)
1212 ma->mca_flags |= MAF_GSQUERY;
1213 else
1214 ma->mca_flags &= ~MAF_GSQUERY;
1215 }
1216 if (!(ma->mca_flags & MAF_GSQUERY) ||
1217 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1218 igmp6_group_queried(ma, max_delay);
1219 spin_unlock_bh(&ma->mca_lock);
1220 break;
1221 }
1222 }
1223 read_unlock_bh(&idev->lock);
1224
1225 return 0;
1226}
1227
1228/* called with rcu_read_lock() */
1229int igmp6_event_report(struct sk_buff *skb)
1230{
1231 struct ifmcaddr6 *ma;
1232 struct inet6_dev *idev;
1233 struct mld_msg *mld;
1234 int addr_type;
1235
1236 /* Our own report looped back. Ignore it. */
1237 if (skb->pkt_type == PACKET_LOOPBACK)
1238 return 0;
1239
1240 /* send our report if the MC router may not have heard this report */
1241 if (skb->pkt_type != PACKET_MULTICAST &&
1242 skb->pkt_type != PACKET_BROADCAST)
1243 return 0;
1244
1245 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1246 return -EINVAL;
1247
1248 mld = (struct mld_msg *)icmp6_hdr(skb);
1249
1250 /* Drop reports with not link local source */
1251 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1252 if (addr_type != IPV6_ADDR_ANY &&
1253 !(addr_type&IPV6_ADDR_LINKLOCAL))
1254 return -EINVAL;
1255
1256 idev = __in6_dev_get(skb->dev);
1257 if (idev == NULL)
1258 return -ENODEV;
1259
1260 /*
1261 * Cancel the timer for this group
1262 */
1263
1264 read_lock_bh(&idev->lock);
1265 for (ma = idev->mc_list; ma; ma=ma->next) {
1266 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1267 spin_lock(&ma->mca_lock);
1268 if (del_timer(&ma->mca_timer))
1269 atomic_dec(&ma->mca_refcnt);
1270 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1271 spin_unlock(&ma->mca_lock);
1272 break;
1273 }
1274 }
1275 read_unlock_bh(&idev->lock);
1276 return 0;
1277}
1278
1279static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1280 int gdeleted, int sdeleted)
1281{
1282 switch (type) {
1283 case MLD2_MODE_IS_INCLUDE:
1284 case MLD2_MODE_IS_EXCLUDE:
1285 if (gdeleted || sdeleted)
1286 return false;
1287 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1288 if (pmc->mca_sfmode == MCAST_INCLUDE)
1289 return true;
1290 /* don't include if this source is excluded
1291 * in all filters
1292 */
1293 if (psf->sf_count[MCAST_INCLUDE])
1294 return type == MLD2_MODE_IS_INCLUDE;
1295 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1296 psf->sf_count[MCAST_EXCLUDE];
1297 }
1298 return false;
1299 case MLD2_CHANGE_TO_INCLUDE:
1300 if (gdeleted || sdeleted)
1301 return false;
1302 return psf->sf_count[MCAST_INCLUDE] != 0;
1303 case MLD2_CHANGE_TO_EXCLUDE:
1304 if (gdeleted || sdeleted)
1305 return false;
1306 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1307 psf->sf_count[MCAST_INCLUDE])
1308 return false;
1309 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1310 psf->sf_count[MCAST_EXCLUDE];
1311 case MLD2_ALLOW_NEW_SOURCES:
1312 if (gdeleted || !psf->sf_crcount)
1313 return false;
1314 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1315 case MLD2_BLOCK_OLD_SOURCES:
1316 if (pmc->mca_sfmode == MCAST_INCLUDE)
1317 return gdeleted || (psf->sf_crcount && sdeleted);
1318 return psf->sf_crcount && !gdeleted && !sdeleted;
1319 }
1320 return false;
1321}
1322
1323static int
1324mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1325{
1326 struct ip6_sf_list *psf;
1327 int scount = 0;
1328
1329 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1330 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1331 continue;
1332 scount++;
1333 }
1334 return scount;
1335}
1336
1337static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1338{
1339 struct net *net = dev_net(dev);
1340 struct sock *sk = net->ipv6.igmp_sk;
1341 struct sk_buff *skb;
1342 struct mld2_report *pmr;
1343 struct in6_addr addr_buf;
1344 const struct in6_addr *saddr;
1345 int hlen = LL_RESERVED_SPACE(dev);
1346 int tlen = dev->needed_tailroom;
1347 int err;
1348 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1349 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1350 IPV6_TLV_PADN, 0 };
1351
1352 /* we assume size > sizeof(ra) here */
1353 size += hlen + tlen;
1354 /* limit our allocations to order-0 page */
1355 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1356 skb = sock_alloc_send_skb(sk, size, 1, &err);
1357
1358 if (!skb)
1359 return NULL;
1360
1361 skb_reserve(skb, hlen);
1362
1363 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1364 /* <draft-ietf-magma-mld-source-05.txt>:
1365 * use unspecified address as the source address
1366 * when a valid link-local address is not available.
1367 */
1368 saddr = &in6addr_any;
1369 } else
1370 saddr = &addr_buf;
1371
1372 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1373
1374 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1375
1376 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1377 skb_put(skb, sizeof(*pmr));
1378 pmr = (struct mld2_report *)skb_transport_header(skb);
1379 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1380 pmr->mld2r_resv1 = 0;
1381 pmr->mld2r_cksum = 0;
1382 pmr->mld2r_resv2 = 0;
1383 pmr->mld2r_ngrec = 0;
1384 return skb;
1385}
1386
1387static void mld_sendpack(struct sk_buff *skb)
1388{
1389 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1390 struct mld2_report *pmr =
1391 (struct mld2_report *)skb_transport_header(skb);
1392 int payload_len, mldlen;
1393 struct inet6_dev *idev;
1394 struct net *net = dev_net(skb->dev);
1395 int err;
1396 struct flowi6 fl6;
1397 struct dst_entry *dst;
1398
1399 rcu_read_lock();
1400 idev = __in6_dev_get(skb->dev);
1401 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1402
1403 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1404 mldlen = skb->tail - skb->transport_header;
1405 pip6->payload_len = htons(payload_len);
1406
1407 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1408 IPPROTO_ICMPV6,
1409 csum_partial(skb_transport_header(skb),
1410 mldlen, 0));
1411
1412 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1413 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1414 skb->dev->ifindex);
1415 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1416
1417 err = 0;
1418 if (IS_ERR(dst)) {
1419 err = PTR_ERR(dst);
1420 dst = NULL;
1421 }
1422 skb_dst_set(skb, dst);
1423 if (err)
1424 goto err_out;
1425
1426 payload_len = skb->len;
1427
1428 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1429 dst_output);
1430out:
1431 if (!err) {
1432 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1433 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1434 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1435 } else
1436 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1437
1438 rcu_read_unlock();
1439 return;
1440
1441err_out:
1442 kfree_skb(skb);
1443 goto out;
1444}
1445
1446static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1447{
1448 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1449}
1450
1451static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1452 int type, struct mld2_grec **ppgr)
1453{
1454 struct net_device *dev = pmc->idev->dev;
1455 struct mld2_report *pmr;
1456 struct mld2_grec *pgr;
1457
1458 if (!skb)
1459 skb = mld_newpack(dev, dev->mtu);
1460 if (!skb)
1461 return NULL;
1462 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1463 pgr->grec_type = type;
1464 pgr->grec_auxwords = 0;
1465 pgr->grec_nsrcs = 0;
1466 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1467 pmr = (struct mld2_report *)skb_transport_header(skb);
1468 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1469 *ppgr = pgr;
1470 return skb;
1471}
1472
1473#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1474 skb_tailroom(skb)) : 0)
1475
1476static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1477 int type, int gdeleted, int sdeleted)
1478{
1479 struct net_device *dev = pmc->idev->dev;
1480 struct mld2_report *pmr;
1481 struct mld2_grec *pgr = NULL;
1482 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1483 int scount, stotal, first, isquery, truncate;
1484
1485 if (pmc->mca_flags & MAF_NOREPORT)
1486 return skb;
1487
1488 isquery = type == MLD2_MODE_IS_INCLUDE ||
1489 type == MLD2_MODE_IS_EXCLUDE;
1490 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1491 type == MLD2_CHANGE_TO_EXCLUDE;
1492
1493 stotal = scount = 0;
1494
1495 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1496
1497 if (!*psf_list)
1498 goto empty_source;
1499
1500 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1501
1502 /* EX and TO_EX get a fresh packet, if needed */
1503 if (truncate) {
1504 if (pmr && pmr->mld2r_ngrec &&
1505 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1506 if (skb)
1507 mld_sendpack(skb);
1508 skb = mld_newpack(dev, dev->mtu);
1509 }
1510 }
1511 first = 1;
1512 psf_prev = NULL;
1513 for (psf=*psf_list; psf; psf=psf_next) {
1514 struct in6_addr *psrc;
1515
1516 psf_next = psf->sf_next;
1517
1518 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1519 psf_prev = psf;
1520 continue;
1521 }
1522
1523 /* clear marks on query responses */
1524 if (isquery)
1525 psf->sf_gsresp = 0;
1526
1527 if (AVAILABLE(skb) < sizeof(*psrc) +
1528 first*sizeof(struct mld2_grec)) {
1529 if (truncate && !first)
1530 break; /* truncate these */
1531 if (pgr)
1532 pgr->grec_nsrcs = htons(scount);
1533 if (skb)
1534 mld_sendpack(skb);
1535 skb = mld_newpack(dev, dev->mtu);
1536 first = 1;
1537 scount = 0;
1538 }
1539 if (first) {
1540 skb = add_grhead(skb, pmc, type, &pgr);
1541 first = 0;
1542 }
1543 if (!skb)
1544 return NULL;
1545 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1546 *psrc = psf->sf_addr;
1547 scount++; stotal++;
1548 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1549 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1550 psf->sf_crcount--;
1551 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1552 if (psf_prev)
1553 psf_prev->sf_next = psf->sf_next;
1554 else
1555 *psf_list = psf->sf_next;
1556 kfree(psf);
1557 continue;
1558 }
1559 }
1560 psf_prev = psf;
1561 }
1562
1563empty_source:
1564 if (!stotal) {
1565 if (type == MLD2_ALLOW_NEW_SOURCES ||
1566 type == MLD2_BLOCK_OLD_SOURCES)
1567 return skb;
1568 if (pmc->mca_crcount || isquery) {
1569 /* make sure we have room for group header */
1570 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1571 mld_sendpack(skb);
1572 skb = NULL; /* add_grhead will get a new one */
1573 }
1574 skb = add_grhead(skb, pmc, type, &pgr);
1575 }
1576 }
1577 if (pgr)
1578 pgr->grec_nsrcs = htons(scount);
1579
1580 if (isquery)
1581 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1582 return skb;
1583}
1584
1585static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1586{
1587 struct sk_buff *skb = NULL;
1588 int type;
1589
1590 if (!pmc) {
1591 read_lock_bh(&idev->lock);
1592 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1593 if (pmc->mca_flags & MAF_NOREPORT)
1594 continue;
1595 spin_lock_bh(&pmc->mca_lock);
1596 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1597 type = MLD2_MODE_IS_EXCLUDE;
1598 else
1599 type = MLD2_MODE_IS_INCLUDE;
1600 skb = add_grec(skb, pmc, type, 0, 0);
1601 spin_unlock_bh(&pmc->mca_lock);
1602 }
1603 read_unlock_bh(&idev->lock);
1604 } else {
1605 spin_lock_bh(&pmc->mca_lock);
1606 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1607 type = MLD2_MODE_IS_EXCLUDE;
1608 else
1609 type = MLD2_MODE_IS_INCLUDE;
1610 skb = add_grec(skb, pmc, type, 0, 0);
1611 spin_unlock_bh(&pmc->mca_lock);
1612 }
1613 if (skb)
1614 mld_sendpack(skb);
1615}
1616
1617/*
1618 * remove zero-count source records from a source filter list
1619 */
1620static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1621{
1622 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1623
1624 psf_prev = NULL;
1625 for (psf=*ppsf; psf; psf = psf_next) {
1626 psf_next = psf->sf_next;
1627 if (psf->sf_crcount == 0) {
1628 if (psf_prev)
1629 psf_prev->sf_next = psf->sf_next;
1630 else
1631 *ppsf = psf->sf_next;
1632 kfree(psf);
1633 } else
1634 psf_prev = psf;
1635 }
1636}
1637
1638static void mld_send_cr(struct inet6_dev *idev)
1639{
1640 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1641 struct sk_buff *skb = NULL;
1642 int type, dtype;
1643
1644 read_lock_bh(&idev->lock);
1645 spin_lock(&idev->mc_lock);
1646
1647 /* deleted MCA's */
1648 pmc_prev = NULL;
1649 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1650 pmc_next = pmc->next;
1651 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1652 type = MLD2_BLOCK_OLD_SOURCES;
1653 dtype = MLD2_BLOCK_OLD_SOURCES;
1654 skb = add_grec(skb, pmc, type, 1, 0);
1655 skb = add_grec(skb, pmc, dtype, 1, 1);
1656 }
1657 if (pmc->mca_crcount) {
1658 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1659 type = MLD2_CHANGE_TO_INCLUDE;
1660 skb = add_grec(skb, pmc, type, 1, 0);
1661 }
1662 pmc->mca_crcount--;
1663 if (pmc->mca_crcount == 0) {
1664 mld_clear_zeros(&pmc->mca_tomb);
1665 mld_clear_zeros(&pmc->mca_sources);
1666 }
1667 }
1668 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1669 !pmc->mca_sources) {
1670 if (pmc_prev)
1671 pmc_prev->next = pmc_next;
1672 else
1673 idev->mc_tomb = pmc_next;
1674 in6_dev_put(pmc->idev);
1675 kfree(pmc);
1676 } else
1677 pmc_prev = pmc;
1678 }
1679 spin_unlock(&idev->mc_lock);
1680
1681 /* change recs */
1682 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1683 spin_lock_bh(&pmc->mca_lock);
1684 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1685 type = MLD2_BLOCK_OLD_SOURCES;
1686 dtype = MLD2_ALLOW_NEW_SOURCES;
1687 } else {
1688 type = MLD2_ALLOW_NEW_SOURCES;
1689 dtype = MLD2_BLOCK_OLD_SOURCES;
1690 }
1691 skb = add_grec(skb, pmc, type, 0, 0);
1692 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1693
1694 /* filter mode changes */
1695 if (pmc->mca_crcount) {
1696 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1697 type = MLD2_CHANGE_TO_EXCLUDE;
1698 else
1699 type = MLD2_CHANGE_TO_INCLUDE;
1700 skb = add_grec(skb, pmc, type, 0, 0);
1701 pmc->mca_crcount--;
1702 }
1703 spin_unlock_bh(&pmc->mca_lock);
1704 }
1705 read_unlock_bh(&idev->lock);
1706 if (!skb)
1707 return;
1708 (void) mld_sendpack(skb);
1709}
1710
1711static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1712{
1713 struct net *net = dev_net(dev);
1714 struct sock *sk = net->ipv6.igmp_sk;
1715 struct inet6_dev *idev;
1716 struct sk_buff *skb;
1717 struct mld_msg *hdr;
1718 const struct in6_addr *snd_addr, *saddr;
1719 struct in6_addr addr_buf;
1720 int hlen = LL_RESERVED_SPACE(dev);
1721 int tlen = dev->needed_tailroom;
1722 int err, len, payload_len, full_len;
1723 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1724 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1725 IPV6_TLV_PADN, 0 };
1726 struct flowi6 fl6;
1727 struct dst_entry *dst;
1728
1729 if (type == ICMPV6_MGM_REDUCTION)
1730 snd_addr = &in6addr_linklocal_allrouters;
1731 else
1732 snd_addr = addr;
1733
1734 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1735 payload_len = len + sizeof(ra);
1736 full_len = sizeof(struct ipv6hdr) + payload_len;
1737
1738 rcu_read_lock();
1739 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1740 IPSTATS_MIB_OUT, full_len);
1741 rcu_read_unlock();
1742
1743 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1744
1745 if (skb == NULL) {
1746 rcu_read_lock();
1747 IP6_INC_STATS(net, __in6_dev_get(dev),
1748 IPSTATS_MIB_OUTDISCARDS);
1749 rcu_read_unlock();
1750 return;
1751 }
1752
1753 skb_reserve(skb, hlen);
1754
1755 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1756 /* <draft-ietf-magma-mld-source-05.txt>:
1757 * use unspecified address as the source address
1758 * when a valid link-local address is not available.
1759 */
1760 saddr = &in6addr_any;
1761 } else
1762 saddr = &addr_buf;
1763
1764 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1765
1766 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1767
1768 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1769 memset(hdr, 0, sizeof(struct mld_msg));
1770 hdr->mld_type = type;
1771 hdr->mld_mca = *addr;
1772
1773 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1774 IPPROTO_ICMPV6,
1775 csum_partial(hdr, len, 0));
1776
1777 rcu_read_lock();
1778 idev = __in6_dev_get(skb->dev);
1779
1780 icmpv6_flow_init(sk, &fl6, type,
1781 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1782 skb->dev->ifindex);
1783 dst = icmp6_dst_alloc(skb->dev, NULL, &fl6);
1784 if (IS_ERR(dst)) {
1785 err = PTR_ERR(dst);
1786 goto err_out;
1787 }
1788
1789 skb_dst_set(skb, dst);
1790 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1791 dst_output);
1792out:
1793 if (!err) {
1794 ICMP6MSGOUT_INC_STATS(net, idev, type);
1795 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1796 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1797 } else
1798 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1799
1800 rcu_read_unlock();
1801 return;
1802
1803err_out:
1804 kfree_skb(skb);
1805 goto out;
1806}
1807
1808static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1809 const struct in6_addr *psfsrc)
1810{
1811 struct ip6_sf_list *psf, *psf_prev;
1812 int rv = 0;
1813
1814 psf_prev = NULL;
1815 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1816 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1817 break;
1818 psf_prev = psf;
1819 }
1820 if (!psf || psf->sf_count[sfmode] == 0) {
1821 /* source filter not found, or count wrong => bug */
1822 return -ESRCH;
1823 }
1824 psf->sf_count[sfmode]--;
1825 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1826 struct inet6_dev *idev = pmc->idev;
1827
1828 /* no more filters for this source */
1829 if (psf_prev)
1830 psf_prev->sf_next = psf->sf_next;
1831 else
1832 pmc->mca_sources = psf->sf_next;
1833 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1834 !MLD_V1_SEEN(idev)) {
1835 psf->sf_crcount = idev->mc_qrv;
1836 psf->sf_next = pmc->mca_tomb;
1837 pmc->mca_tomb = psf;
1838 rv = 1;
1839 } else
1840 kfree(psf);
1841 }
1842 return rv;
1843}
1844
1845static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1846 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1847 int delta)
1848{
1849 struct ifmcaddr6 *pmc;
1850 int changerec = 0;
1851 int i, err;
1852
1853 if (!idev)
1854 return -ENODEV;
1855 read_lock_bh(&idev->lock);
1856 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1857 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1858 break;
1859 }
1860 if (!pmc) {
1861 /* MCA not found?? bug */
1862 read_unlock_bh(&idev->lock);
1863 return -ESRCH;
1864 }
1865 spin_lock_bh(&pmc->mca_lock);
1866 sf_markstate(pmc);
1867 if (!delta) {
1868 if (!pmc->mca_sfcount[sfmode]) {
1869 spin_unlock_bh(&pmc->mca_lock);
1870 read_unlock_bh(&idev->lock);
1871 return -EINVAL;
1872 }
1873 pmc->mca_sfcount[sfmode]--;
1874 }
1875 err = 0;
1876 for (i=0; i<sfcount; i++) {
1877 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1878
1879 changerec |= rv > 0;
1880 if (!err && rv < 0)
1881 err = rv;
1882 }
1883 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1884 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1885 pmc->mca_sfcount[MCAST_INCLUDE]) {
1886 struct ip6_sf_list *psf;
1887
1888 /* filter mode change */
1889 pmc->mca_sfmode = MCAST_INCLUDE;
1890 pmc->mca_crcount = idev->mc_qrv;
1891 idev->mc_ifc_count = pmc->mca_crcount;
1892 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1893 psf->sf_crcount = 0;
1894 mld_ifc_event(pmc->idev);
1895 } else if (sf_setstate(pmc) || changerec)
1896 mld_ifc_event(pmc->idev);
1897 spin_unlock_bh(&pmc->mca_lock);
1898 read_unlock_bh(&idev->lock);
1899 return err;
1900}
1901
1902/*
1903 * Add multicast single-source filter to the interface list
1904 */
1905static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1906 const struct in6_addr *psfsrc)
1907{
1908 struct ip6_sf_list *psf, *psf_prev;
1909
1910 psf_prev = NULL;
1911 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1912 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1913 break;
1914 psf_prev = psf;
1915 }
1916 if (!psf) {
1917 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1918 if (!psf)
1919 return -ENOBUFS;
1920
1921 psf->sf_addr = *psfsrc;
1922 if (psf_prev) {
1923 psf_prev->sf_next = psf;
1924 } else
1925 pmc->mca_sources = psf;
1926 }
1927 psf->sf_count[sfmode]++;
1928 return 0;
1929}
1930
1931static void sf_markstate(struct ifmcaddr6 *pmc)
1932{
1933 struct ip6_sf_list *psf;
1934 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1935
1936 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1937 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1938 psf->sf_oldin = mca_xcount ==
1939 psf->sf_count[MCAST_EXCLUDE] &&
1940 !psf->sf_count[MCAST_INCLUDE];
1941 } else
1942 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1943}
1944
1945static int sf_setstate(struct ifmcaddr6 *pmc)
1946{
1947 struct ip6_sf_list *psf, *dpsf;
1948 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1949 int qrv = pmc->idev->mc_qrv;
1950 int new_in, rv;
1951
1952 rv = 0;
1953 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1954 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1955 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1956 !psf->sf_count[MCAST_INCLUDE];
1957 } else
1958 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1959 if (new_in) {
1960 if (!psf->sf_oldin) {
1961 struct ip6_sf_list *prev = NULL;
1962
1963 for (dpsf=pmc->mca_tomb; dpsf;
1964 dpsf=dpsf->sf_next) {
1965 if (ipv6_addr_equal(&dpsf->sf_addr,
1966 &psf->sf_addr))
1967 break;
1968 prev = dpsf;
1969 }
1970 if (dpsf) {
1971 if (prev)
1972 prev->sf_next = dpsf->sf_next;
1973 else
1974 pmc->mca_tomb = dpsf->sf_next;
1975 kfree(dpsf);
1976 }
1977 psf->sf_crcount = qrv;
1978 rv++;
1979 }
1980 } else if (psf->sf_oldin) {
1981 psf->sf_crcount = 0;
1982 /*
1983 * add or update "delete" records if an active filter
1984 * is now inactive
1985 */
1986 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1987 if (ipv6_addr_equal(&dpsf->sf_addr,
1988 &psf->sf_addr))
1989 break;
1990 if (!dpsf) {
1991 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1992 if (!dpsf)
1993 continue;
1994 *dpsf = *psf;
1995 /* pmc->mca_lock held by callers */
1996 dpsf->sf_next = pmc->mca_tomb;
1997 pmc->mca_tomb = dpsf;
1998 }
1999 dpsf->sf_crcount = qrv;
2000 rv++;
2001 }
2002 }
2003 return rv;
2004}
2005
2006/*
2007 * Add multicast source filter list to the interface list
2008 */
2009static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2010 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2011 int delta)
2012{
2013 struct ifmcaddr6 *pmc;
2014 int isexclude;
2015 int i, err;
2016
2017 if (!idev)
2018 return -ENODEV;
2019 read_lock_bh(&idev->lock);
2020 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2021 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2022 break;
2023 }
2024 if (!pmc) {
2025 /* MCA not found?? bug */
2026 read_unlock_bh(&idev->lock);
2027 return -ESRCH;
2028 }
2029 spin_lock_bh(&pmc->mca_lock);
2030
2031 sf_markstate(pmc);
2032 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2033 if (!delta)
2034 pmc->mca_sfcount[sfmode]++;
2035 err = 0;
2036 for (i=0; i<sfcount; i++) {
2037 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2038 if (err)
2039 break;
2040 }
2041 if (err) {
2042 int j;
2043
2044 if (!delta)
2045 pmc->mca_sfcount[sfmode]--;
2046 for (j=0; j<i; j++)
2047 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2048 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2049 struct ip6_sf_list *psf;
2050
2051 /* filter mode change */
2052 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2053 pmc->mca_sfmode = MCAST_EXCLUDE;
2054 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2055 pmc->mca_sfmode = MCAST_INCLUDE;
2056 /* else no filters; keep old mode for reports */
2057
2058 pmc->mca_crcount = idev->mc_qrv;
2059 idev->mc_ifc_count = pmc->mca_crcount;
2060 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2061 psf->sf_crcount = 0;
2062 mld_ifc_event(idev);
2063 } else if (sf_setstate(pmc))
2064 mld_ifc_event(idev);
2065 spin_unlock_bh(&pmc->mca_lock);
2066 read_unlock_bh(&idev->lock);
2067 return err;
2068}
2069
2070static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2071{
2072 struct ip6_sf_list *psf, *nextpsf;
2073
2074 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2075 nextpsf = psf->sf_next;
2076 kfree(psf);
2077 }
2078 pmc->mca_tomb = NULL;
2079 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2080 nextpsf = psf->sf_next;
2081 kfree(psf);
2082 }
2083 pmc->mca_sources = NULL;
2084 pmc->mca_sfmode = MCAST_EXCLUDE;
2085 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2086 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2087}
2088
2089
2090static void igmp6_join_group(struct ifmcaddr6 *ma)
2091{
2092 unsigned long delay;
2093
2094 if (ma->mca_flags & MAF_NOREPORT)
2095 return;
2096
2097 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2098
2099 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2100
2101 spin_lock_bh(&ma->mca_lock);
2102 if (del_timer(&ma->mca_timer)) {
2103 atomic_dec(&ma->mca_refcnt);
2104 delay = ma->mca_timer.expires - jiffies;
2105 }
2106
2107 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2108 atomic_inc(&ma->mca_refcnt);
2109 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2110 spin_unlock_bh(&ma->mca_lock);
2111}
2112
2113static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2114 struct inet6_dev *idev)
2115{
2116 int err;
2117
2118 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2119 * so no other readers or writers of iml or its sflist
2120 */
2121 if (!iml->sflist) {
2122 /* any-source empty exclude case */
2123 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2124 }
2125 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2126 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2127 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2128 iml->sflist = NULL;
2129 return err;
2130}
2131
2132static void igmp6_leave_group(struct ifmcaddr6 *ma)
2133{
2134 if (MLD_V1_SEEN(ma->idev)) {
2135 if (ma->mca_flags & MAF_LAST_REPORTER)
2136 igmp6_send(&ma->mca_addr, ma->idev->dev,
2137 ICMPV6_MGM_REDUCTION);
2138 } else {
2139 mld_add_delrec(ma->idev, ma);
2140 mld_ifc_event(ma->idev);
2141 }
2142}
2143
2144static void mld_gq_timer_expire(unsigned long data)
2145{
2146 struct inet6_dev *idev = (struct inet6_dev *)data;
2147
2148 idev->mc_gq_running = 0;
2149 mld_send_report(idev, NULL);
2150 __in6_dev_put(idev);
2151}
2152
2153static void mld_ifc_timer_expire(unsigned long data)
2154{
2155 struct inet6_dev *idev = (struct inet6_dev *)data;
2156
2157 mld_send_cr(idev);
2158 if (idev->mc_ifc_count) {
2159 idev->mc_ifc_count--;
2160 if (idev->mc_ifc_count)
2161 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2162 }
2163 __in6_dev_put(idev);
2164}
2165
2166static void mld_ifc_event(struct inet6_dev *idev)
2167{
2168 if (MLD_V1_SEEN(idev))
2169 return;
2170 idev->mc_ifc_count = idev->mc_qrv;
2171 mld_ifc_start_timer(idev, 1);
2172}
2173
2174
2175static void igmp6_timer_handler(unsigned long data)
2176{
2177 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2178
2179 if (MLD_V1_SEEN(ma->idev))
2180 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2181 else
2182 mld_send_report(ma->idev, ma);
2183
2184 spin_lock(&ma->mca_lock);
2185 ma->mca_flags |= MAF_LAST_REPORTER;
2186 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2187 spin_unlock(&ma->mca_lock);
2188 ma_put(ma);
2189}
2190
2191/* Device changing type */
2192
2193void ipv6_mc_unmap(struct inet6_dev *idev)
2194{
2195 struct ifmcaddr6 *i;
2196
2197 /* Install multicast list, except for all-nodes (already installed) */
2198
2199 read_lock_bh(&idev->lock);
2200 for (i = idev->mc_list; i; i = i->next)
2201 igmp6_group_dropped(i);
2202 read_unlock_bh(&idev->lock);
2203}
2204
2205void ipv6_mc_remap(struct inet6_dev *idev)
2206{
2207 ipv6_mc_up(idev);
2208}
2209
2210/* Device going down */
2211
2212void ipv6_mc_down(struct inet6_dev *idev)
2213{
2214 struct ifmcaddr6 *i;
2215
2216 /* Withdraw multicast list */
2217
2218 read_lock_bh(&idev->lock);
2219 idev->mc_ifc_count = 0;
2220 if (del_timer(&idev->mc_ifc_timer))
2221 __in6_dev_put(idev);
2222 idev->mc_gq_running = 0;
2223 if (del_timer(&idev->mc_gq_timer))
2224 __in6_dev_put(idev);
2225
2226 for (i = idev->mc_list; i; i=i->next)
2227 igmp6_group_dropped(i);
2228 read_unlock_bh(&idev->lock);
2229
2230 mld_clear_delrec(idev);
2231}
2232
2233
2234/* Device going up */
2235
2236void ipv6_mc_up(struct inet6_dev *idev)
2237{
2238 struct ifmcaddr6 *i;
2239
2240 /* Install multicast list, except for all-nodes (already installed) */
2241
2242 read_lock_bh(&idev->lock);
2243 for (i = idev->mc_list; i; i=i->next)
2244 igmp6_group_added(i);
2245 read_unlock_bh(&idev->lock);
2246}
2247
2248/* IPv6 device initialization. */
2249
2250void ipv6_mc_init_dev(struct inet6_dev *idev)
2251{
2252 write_lock_bh(&idev->lock);
2253 spin_lock_init(&idev->mc_lock);
2254 idev->mc_gq_running = 0;
2255 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2256 (unsigned long)idev);
2257 idev->mc_tomb = NULL;
2258 idev->mc_ifc_count = 0;
2259 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2260 (unsigned long)idev);
2261 idev->mc_qrv = MLD_QRV_DEFAULT;
2262 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2263 idev->mc_v1_seen = 0;
2264 write_unlock_bh(&idev->lock);
2265}
2266
2267/*
2268 * Device is about to be destroyed: clean up.
2269 */
2270
2271void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2272{
2273 struct ifmcaddr6 *i;
2274
2275 /* Deactivate timers */
2276 ipv6_mc_down(idev);
2277
2278 /* Delete all-nodes address. */
2279 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2280 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2281 * fail.
2282 */
2283 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2284
2285 if (idev->cnf.forwarding)
2286 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2287
2288 write_lock_bh(&idev->lock);
2289 while ((i = idev->mc_list) != NULL) {
2290 idev->mc_list = i->next;
2291 write_unlock_bh(&idev->lock);
2292
2293 igmp6_group_dropped(i);
2294 ma_put(i);
2295
2296 write_lock_bh(&idev->lock);
2297 }
2298 write_unlock_bh(&idev->lock);
2299}
2300
2301#ifdef CONFIG_PROC_FS
2302struct igmp6_mc_iter_state {
2303 struct seq_net_private p;
2304 struct net_device *dev;
2305 struct inet6_dev *idev;
2306};
2307
2308#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2309
2310static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2311{
2312 struct ifmcaddr6 *im = NULL;
2313 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2314 struct net *net = seq_file_net(seq);
2315
2316 state->idev = NULL;
2317 for_each_netdev_rcu(net, state->dev) {
2318 struct inet6_dev *idev;
2319 idev = __in6_dev_get(state->dev);
2320 if (!idev)
2321 continue;
2322 read_lock_bh(&idev->lock);
2323 im = idev->mc_list;
2324 if (im) {
2325 state->idev = idev;
2326 break;
2327 }
2328 read_unlock_bh(&idev->lock);
2329 }
2330 return im;
2331}
2332
2333static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2334{
2335 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2336
2337 im = im->next;
2338 while (!im) {
2339 if (likely(state->idev != NULL))
2340 read_unlock_bh(&state->idev->lock);
2341
2342 state->dev = next_net_device_rcu(state->dev);
2343 if (!state->dev) {
2344 state->idev = NULL;
2345 break;
2346 }
2347 state->idev = __in6_dev_get(state->dev);
2348 if (!state->idev)
2349 continue;
2350 read_lock_bh(&state->idev->lock);
2351 im = state->idev->mc_list;
2352 }
2353 return im;
2354}
2355
2356static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2357{
2358 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2359 if (im)
2360 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2361 --pos;
2362 return pos ? NULL : im;
2363}
2364
2365static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2366 __acquires(RCU)
2367{
2368 rcu_read_lock();
2369 return igmp6_mc_get_idx(seq, *pos);
2370}
2371
2372static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2373{
2374 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2375
2376 ++*pos;
2377 return im;
2378}
2379
2380static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2381 __releases(RCU)
2382{
2383 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2384
2385 if (likely(state->idev != NULL)) {
2386 read_unlock_bh(&state->idev->lock);
2387 state->idev = NULL;
2388 }
2389 state->dev = NULL;
2390 rcu_read_unlock();
2391}
2392
2393static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2394{
2395 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2396 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2397
2398 seq_printf(seq,
2399 "%-4d %-15s %pi6 %5d %08X %ld\n",
2400 state->dev->ifindex, state->dev->name,
2401 &im->mca_addr,
2402 im->mca_users, im->mca_flags,
2403 (im->mca_flags&MAF_TIMER_RUNNING) ?
2404 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2405 return 0;
2406}
2407
2408static const struct seq_operations igmp6_mc_seq_ops = {
2409 .start = igmp6_mc_seq_start,
2410 .next = igmp6_mc_seq_next,
2411 .stop = igmp6_mc_seq_stop,
2412 .show = igmp6_mc_seq_show,
2413};
2414
2415static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2416{
2417 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2418 sizeof(struct igmp6_mc_iter_state));
2419}
2420
2421static const struct file_operations igmp6_mc_seq_fops = {
2422 .owner = THIS_MODULE,
2423 .open = igmp6_mc_seq_open,
2424 .read = seq_read,
2425 .llseek = seq_lseek,
2426 .release = seq_release_net,
2427};
2428
2429struct igmp6_mcf_iter_state {
2430 struct seq_net_private p;
2431 struct net_device *dev;
2432 struct inet6_dev *idev;
2433 struct ifmcaddr6 *im;
2434};
2435
2436#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2437
2438static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2439{
2440 struct ip6_sf_list *psf = NULL;
2441 struct ifmcaddr6 *im = NULL;
2442 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2443 struct net *net = seq_file_net(seq);
2444
2445 state->idev = NULL;
2446 state->im = NULL;
2447 for_each_netdev_rcu(net, state->dev) {
2448 struct inet6_dev *idev;
2449 idev = __in6_dev_get(state->dev);
2450 if (unlikely(idev == NULL))
2451 continue;
2452 read_lock_bh(&idev->lock);
2453 im = idev->mc_list;
2454 if (likely(im != NULL)) {
2455 spin_lock_bh(&im->mca_lock);
2456 psf = im->mca_sources;
2457 if (likely(psf != NULL)) {
2458 state->im = im;
2459 state->idev = idev;
2460 break;
2461 }
2462 spin_unlock_bh(&im->mca_lock);
2463 }
2464 read_unlock_bh(&idev->lock);
2465 }
2466 return psf;
2467}
2468
2469static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2470{
2471 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2472
2473 psf = psf->sf_next;
2474 while (!psf) {
2475 spin_unlock_bh(&state->im->mca_lock);
2476 state->im = state->im->next;
2477 while (!state->im) {
2478 if (likely(state->idev != NULL))
2479 read_unlock_bh(&state->idev->lock);
2480
2481 state->dev = next_net_device_rcu(state->dev);
2482 if (!state->dev) {
2483 state->idev = NULL;
2484 goto out;
2485 }
2486 state->idev = __in6_dev_get(state->dev);
2487 if (!state->idev)
2488 continue;
2489 read_lock_bh(&state->idev->lock);
2490 state->im = state->idev->mc_list;
2491 }
2492 if (!state->im)
2493 break;
2494 spin_lock_bh(&state->im->mca_lock);
2495 psf = state->im->mca_sources;
2496 }
2497out:
2498 return psf;
2499}
2500
2501static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2502{
2503 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2504 if (psf)
2505 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2506 --pos;
2507 return pos ? NULL : psf;
2508}
2509
2510static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2511 __acquires(RCU)
2512{
2513 rcu_read_lock();
2514 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2515}
2516
2517static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2518{
2519 struct ip6_sf_list *psf;
2520 if (v == SEQ_START_TOKEN)
2521 psf = igmp6_mcf_get_first(seq);
2522 else
2523 psf = igmp6_mcf_get_next(seq, v);
2524 ++*pos;
2525 return psf;
2526}
2527
2528static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2529 __releases(RCU)
2530{
2531 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2532 if (likely(state->im != NULL)) {
2533 spin_unlock_bh(&state->im->mca_lock);
2534 state->im = NULL;
2535 }
2536 if (likely(state->idev != NULL)) {
2537 read_unlock_bh(&state->idev->lock);
2538 state->idev = NULL;
2539 }
2540 state->dev = NULL;
2541 rcu_read_unlock();
2542}
2543
2544static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2545{
2546 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2547 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2548
2549 if (v == SEQ_START_TOKEN) {
2550 seq_printf(seq,
2551 "%3s %6s "
2552 "%32s %32s %6s %6s\n", "Idx",
2553 "Device", "Multicast Address",
2554 "Source Address", "INC", "EXC");
2555 } else {
2556 seq_printf(seq,
2557 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2558 state->dev->ifindex, state->dev->name,
2559 &state->im->mca_addr,
2560 &psf->sf_addr,
2561 psf->sf_count[MCAST_INCLUDE],
2562 psf->sf_count[MCAST_EXCLUDE]);
2563 }
2564 return 0;
2565}
2566
2567static const struct seq_operations igmp6_mcf_seq_ops = {
2568 .start = igmp6_mcf_seq_start,
2569 .next = igmp6_mcf_seq_next,
2570 .stop = igmp6_mcf_seq_stop,
2571 .show = igmp6_mcf_seq_show,
2572};
2573
2574static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2575{
2576 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2577 sizeof(struct igmp6_mcf_iter_state));
2578}
2579
2580static const struct file_operations igmp6_mcf_seq_fops = {
2581 .owner = THIS_MODULE,
2582 .open = igmp6_mcf_seq_open,
2583 .read = seq_read,
2584 .llseek = seq_lseek,
2585 .release = seq_release_net,
2586};
2587
2588static int __net_init igmp6_proc_init(struct net *net)
2589{
2590 int err;
2591
2592 err = -ENOMEM;
2593 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2594 goto out;
2595 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2596 &igmp6_mcf_seq_fops))
2597 goto out_proc_net_igmp6;
2598
2599 err = 0;
2600out:
2601 return err;
2602
2603out_proc_net_igmp6:
2604 proc_net_remove(net, "igmp6");
2605 goto out;
2606}
2607
2608static void __net_exit igmp6_proc_exit(struct net *net)
2609{
2610 proc_net_remove(net, "mcfilter6");
2611 proc_net_remove(net, "igmp6");
2612}
2613#else
2614static inline int igmp6_proc_init(struct net *net)
2615{
2616 return 0;
2617}
2618static inline void igmp6_proc_exit(struct net *net)
2619{
2620}
2621#endif
2622
2623static int __net_init igmp6_net_init(struct net *net)
2624{
2625 int err;
2626
2627 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2628 SOCK_RAW, IPPROTO_ICMPV6, net);
2629 if (err < 0) {
2630 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2631 err);
2632 goto out;
2633 }
2634
2635 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2636
2637 err = igmp6_proc_init(net);
2638 if (err)
2639 goto out_sock_create;
2640out:
2641 return err;
2642
2643out_sock_create:
2644 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2645 goto out;
2646}
2647
2648static void __net_exit igmp6_net_exit(struct net *net)
2649{
2650 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2651 igmp6_proc_exit(net);
2652}
2653
2654static struct pernet_operations igmp6_net_ops = {
2655 .init = igmp6_net_init,
2656 .exit = igmp6_net_exit,
2657};
2658
2659int __init igmp6_init(void)
2660{
2661 return register_pernet_subsys(&igmp6_net_ops);
2662}
2663
2664void igmp6_cleanup(void)
2665{
2666 unregister_pernet_subsys(&igmp6_net_ops);
2667}