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Linux 5.4.12
[linux/fpc-iii.git] / net / ipv6 / mcast.c
blobeaa4c2cc2fbb2e784b5641135d28dd38a0616421
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. */
64 static 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
70 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
71
72 static void igmp6_join_group(struct ifmcaddr6 *ma);
73 static void igmp6_leave_group(struct ifmcaddr6 *ma);
74 static void igmp6_timer_handler(struct timer_list *t);
75
76 static void mld_gq_timer_expire(struct timer_list *t);
77 static void mld_ifc_timer_expire(struct timer_list *t);
78 static void mld_ifc_event(struct inet6_dev *idev);
79 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
80 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
81 static void mld_clear_delrec(struct inet6_dev *idev);
82 static bool mld_in_v1_mode(const struct inet6_dev *idev);
83 static int sf_setstate(struct ifmcaddr6 *pmc);
84 static void sf_markstate(struct ifmcaddr6 *pmc);
85 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
86 static 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);
89 static 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);
92 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
93 struct inet6_dev *idev);
94 static 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
109 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
110 int 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
121 static 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
133 static 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
202 int 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 }
206 EXPORT_SYMBOL(ipv6_sock_mc_join);
207
208 int 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 */
217 int 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 }
256 EXPORT_SYMBOL(ipv6_sock_mc_drop);
257
258 /* called with rcu_read_lock() */
259 static 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
289 void __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
317 void 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
328 int 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);
450 done:
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
460 int 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;
541 done:
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
549 int 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;
614 done:
615 read_unlock_bh(&idev->lock);
616 rcu_read_unlock();
617 return err;
618 }
619
620 bool 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
659 static 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
695 static 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 */
727 static 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
765 static 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
804 static 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
837 static void mca_get(struct ifmcaddr6 *mc)
838 {
839 refcount_inc(&mc->mca_refcnt);
840 }
841
842 static 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
850 static 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 */
883 static 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
936 int 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 }
940 EXPORT_SYMBOL(ipv6_dev_mc_inc);
941
942 /*
943 * device multicast group del
944 */
945 int __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
973 int 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 }
988 EXPORT_SYMBOL(ipv6_dev_mc_dec);
989
990 /*
991 * check if the interface/address pair is valid
992 */
993 bool 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
1033 static 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
1042 static 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
1049 static 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
1057 static 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
1064 static 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
1072 static 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
1082 static 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 */
1106 static 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
1134 static 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
1165 static 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
1178 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1179 {
1180 return mld_force_mld_version(idev) == 2;
1181 }
1182
1183 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1184 {
1185 return mld_force_mld_version(idev) == 1;
1186 }
1187
1188 static 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
1200 static 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
1215 static 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
1240 static 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
1265 static 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
1275 static 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
1321 static 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() */
1336 int 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() */
1456 int 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
1506 static 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
1550 static int
1551 mld_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
1564 static 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
1589 static 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
1642 static 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);
1685 out:
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
1696 err_out:
1697 kfree_skb(skb);
1698 goto out;
1699 }
1700
1701 static 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
1706 static 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
1730 static 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) {
1819 decrease_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
1833 empty_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
1855 static 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 */
1890 static 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
1908 static 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
1981 static 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);
2062 out:
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
2072 err_out:
2073 kfree_skb(skb);
2074 goto out;
2075 }
2076
2077 static 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
2102 void 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
2114 static 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
2128 static 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
2165 static 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 */
2225 static 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
2251 static 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
2265 static 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 */
2329 static 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
2390 static 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
2410 static 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
2433 static 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
2452 static 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
2464 static 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
2473 static 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
2487 static 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
2495 static 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
2513 void 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
2525 void ipv6_mc_remap(struct inet6_dev *idev)
2526 {
2527 ipv6_mc_up(idev);
2528 }
2529
2530 /* Device going down */
2531
2532 void 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
2552 static 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
2563 void 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
2580 void 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
2598 void 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
2627 static 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
2642 static 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
2661 static struct notifier_block igmp6_netdev_notifier = {
2662 .notifier_call = ipv6_mc_netdev_event,
2663 };
2664
2665 #ifdef CONFIG_PROC_FS
2666 struct 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
2674 static 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
2697 static 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
2720 static 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
2729 static 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
2736 static 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
2744 static 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
2757 static 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
2772 static 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
2779 struct 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
2788 static 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
2819 static 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 }
2847 out:
2848 return psf;
2849 }
2850
2851 static 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
2860 static 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
2867 static 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
2878 static 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
2894 static 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
2913 static 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
2920 static 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;
2934 out:
2935 return err;
2936
2937 out_proc_net_igmp6:
2938 remove_proc_entry("igmp6", net->proc_net);
2939 goto out;
2940 }
2941
2942 static 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
2948 static inline int igmp6_proc_init(struct net *net)
2949 {
2950 return 0;
2951 }
2952 static inline void igmp6_proc_exit(struct net *net)
2953 {
2954 }
2955 #endif
2956
2957 static 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
2985 out_sock_create_autojoin:
2986 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2987 out_sock_create:
2988 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2989 out:
2990 return err;
2991 }
2992
2993 static 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
3000 static struct pernet_operations igmp6_net_ops = {
3001 .init = igmp6_net_init,
3002 .exit = igmp6_net_exit,
3003 };
3004
3005 int __init igmp6_init(void)
3006 {
3007 return register_pernet_subsys(&igmp6_net_ops);
3008 }
3009
3010 int __init igmp6_late_init(void)
3011 {
3012 return register_netdevice_notifier(&igmp6_netdev_notifier);
3013 }
3014
3015 void igmp6_cleanup(void)
3016 {
3017 unregister_pernet_subsys(&igmp6_net_ops);
3018 }
3019
3020 void igmp6_late_cleanup(void)
3021 {
3022 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3023 }
Linux with added FPC-III support