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