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Merge tag 'tegra-for-5.20-arm64-defconfig' of git://git.kernel.org/pub/scm/linux...
[people/ms/linux.git] / net / ipv6 / mcast.c
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/net.h>
33 #include <linux/in.h>
34 #include <linux/in6.h>
35 #include <linux/netdevice.h>
36 #include <linux/if_arp.h>
37 #include <linux/route.h>
38 #include <linux/init.h>
39 #include <linux/proc_fs.h>
40 #include <linux/seq_file.h>
41 #include <linux/slab.h>
42 #include <linux/pkt_sched.h>
43 #include <net/mld.h>
44 #include <linux/workqueue.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 workqueue_struct *mld_wq;
71 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
72
73 static void igmp6_join_group(struct ifmcaddr6 *ma);
74 static void igmp6_leave_group(struct ifmcaddr6 *ma);
75 static void mld_mca_work(struct work_struct *work);
76
77 static void mld_ifc_event(struct inet6_dev *idev);
78 static bool mld_in_v1_mode(const struct inet6_dev *idev);
79 static int sf_setstate(struct ifmcaddr6 *pmc);
80 static void sf_markstate(struct ifmcaddr6 *pmc);
81 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
82 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
83 int sfmode, int sfcount, const struct in6_addr *psfsrc,
84 int delta);
85 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
86 int sfmode, int sfcount, const struct in6_addr *psfsrc,
87 int delta);
88 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
89 struct inet6_dev *idev);
90 static int __ipv6_dev_mc_inc(struct net_device *dev,
91 const struct in6_addr *addr, unsigned int mode);
92
93 #define MLD_QRV_DEFAULT 2
94 /* RFC3810, 9.2. Query Interval */
95 #define MLD_QI_DEFAULT (125 * HZ)
96 /* RFC3810, 9.3. Query Response Interval */
97 #define MLD_QRI_DEFAULT (10 * HZ)
98
99 /* RFC3810, 8.1 Query Version Distinctions */
100 #define MLD_V1_QUERY_LEN 24
101 #define MLD_V2_QUERY_LEN_MIN 28
102
103 #define IPV6_MLD_MAX_MSF 64
104
105 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
106 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
107
108 /*
109 * socket join on multicast group
110 */
111 #define mc_dereference(e, idev) \
112 rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock))
113
114 #define sock_dereference(e, sk) \
115 rcu_dereference_protected(e, lockdep_sock_is_held(sk))
116
117 #define for_each_pmc_socklock(np, sk, pmc) \
118 for (pmc = sock_dereference((np)->ipv6_mc_list, sk); \
119 pmc; \
120 pmc = sock_dereference(pmc->next, sk))
121
122 #define for_each_pmc_rcu(np, pmc) \
123 for (pmc = rcu_dereference((np)->ipv6_mc_list); \
124 pmc; \
125 pmc = rcu_dereference(pmc->next))
126
127 #define for_each_psf_mclock(mc, psf) \
128 for (psf = mc_dereference((mc)->mca_sources, mc->idev); \
129 psf; \
130 psf = mc_dereference(psf->sf_next, mc->idev))
131
132 #define for_each_psf_rcu(mc, psf) \
133 for (psf = rcu_dereference((mc)->mca_sources); \
134 psf; \
135 psf = rcu_dereference(psf->sf_next))
136
137 #define for_each_psf_tomb(mc, psf) \
138 for (psf = mc_dereference((mc)->mca_tomb, mc->idev); \
139 psf; \
140 psf = mc_dereference(psf->sf_next, mc->idev))
141
142 #define for_each_mc_mclock(idev, mc) \
143 for (mc = mc_dereference((idev)->mc_list, idev); \
144 mc; \
145 mc = mc_dereference(mc->next, idev))
146
147 #define for_each_mc_rcu(idev, mc) \
148 for (mc = rcu_dereference((idev)->mc_list); \
149 mc; \
150 mc = rcu_dereference(mc->next))
151
152 #define for_each_mc_tomb(idev, mc) \
153 for (mc = mc_dereference((idev)->mc_tomb, idev); \
154 mc; \
155 mc = mc_dereference(mc->next, idev))
156
157 static int unsolicited_report_interval(struct inet6_dev *idev)
158 {
159 int iv;
160
161 if (mld_in_v1_mode(idev))
162 iv = idev->cnf.mldv1_unsolicited_report_interval;
163 else
164 iv = idev->cnf.mldv2_unsolicited_report_interval;
165
166 return iv > 0 ? iv : 1;
167 }
168
169 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
170 const struct in6_addr *addr, unsigned int mode)
171 {
172 struct net_device *dev = NULL;
173 struct ipv6_mc_socklist *mc_lst;
174 struct ipv6_pinfo *np = inet6_sk(sk);
175 struct net *net = sock_net(sk);
176 int err;
177
178 ASSERT_RTNL();
179
180 if (!ipv6_addr_is_multicast(addr))
181 return -EINVAL;
182
183 for_each_pmc_socklock(np, sk, mc_lst) {
184 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
185 ipv6_addr_equal(&mc_lst->addr, addr))
186 return -EADDRINUSE;
187 }
188
189 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
190
191 if (!mc_lst)
192 return -ENOMEM;
193
194 mc_lst->next = NULL;
195 mc_lst->addr = *addr;
196
197 if (ifindex == 0) {
198 struct rt6_info *rt;
199 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
200 if (rt) {
201 dev = rt->dst.dev;
202 ip6_rt_put(rt);
203 }
204 } else
205 dev = __dev_get_by_index(net, ifindex);
206
207 if (!dev) {
208 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
209 return -ENODEV;
210 }
211
212 mc_lst->ifindex = dev->ifindex;
213 mc_lst->sfmode = mode;
214 RCU_INIT_POINTER(mc_lst->sflist, NULL);
215
216 /*
217 * now add/increase the group membership on the device
218 */
219
220 err = __ipv6_dev_mc_inc(dev, addr, mode);
221
222 if (err) {
223 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
224 return err;
225 }
226
227 mc_lst->next = np->ipv6_mc_list;
228 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
229
230 return 0;
231 }
232
233 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
234 {
235 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
236 }
237 EXPORT_SYMBOL(ipv6_sock_mc_join);
238
239 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
240 const struct in6_addr *addr, unsigned int mode)
241 {
242 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
243 }
244
245 /*
246 * socket leave on multicast group
247 */
248 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
249 {
250 struct ipv6_pinfo *np = inet6_sk(sk);
251 struct ipv6_mc_socklist *mc_lst;
252 struct ipv6_mc_socklist __rcu **lnk;
253 struct net *net = sock_net(sk);
254
255 ASSERT_RTNL();
256
257 if (!ipv6_addr_is_multicast(addr))
258 return -EINVAL;
259
260 for (lnk = &np->ipv6_mc_list;
261 (mc_lst = sock_dereference(*lnk, sk)) != NULL;
262 lnk = &mc_lst->next) {
263 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
264 ipv6_addr_equal(&mc_lst->addr, addr)) {
265 struct net_device *dev;
266
267 *lnk = mc_lst->next;
268
269 dev = __dev_get_by_index(net, mc_lst->ifindex);
270 if (dev) {
271 struct inet6_dev *idev = __in6_dev_get(dev);
272
273 ip6_mc_leave_src(sk, mc_lst, idev);
274 if (idev)
275 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
276 } else {
277 ip6_mc_leave_src(sk, mc_lst, NULL);
278 }
279
280 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
281 kfree_rcu(mc_lst, rcu);
282 return 0;
283 }
284 }
285
286 return -EADDRNOTAVAIL;
287 }
288 EXPORT_SYMBOL(ipv6_sock_mc_drop);
289
290 static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net,
291 const struct in6_addr *group,
292 int ifindex)
293 {
294 struct net_device *dev = NULL;
295 struct inet6_dev *idev = NULL;
296
297 if (ifindex == 0) {
298 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
299
300 if (rt) {
301 dev = rt->dst.dev;
302 ip6_rt_put(rt);
303 }
304 } else {
305 dev = __dev_get_by_index(net, ifindex);
306 }
307
308 if (!dev)
309 return NULL;
310 idev = __in6_dev_get(dev);
311 if (!idev)
312 return NULL;
313 if (idev->dead)
314 return NULL;
315 return idev;
316 }
317
318 void __ipv6_sock_mc_close(struct sock *sk)
319 {
320 struct ipv6_pinfo *np = inet6_sk(sk);
321 struct ipv6_mc_socklist *mc_lst;
322 struct net *net = sock_net(sk);
323
324 ASSERT_RTNL();
325
326 while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) {
327 struct net_device *dev;
328
329 np->ipv6_mc_list = mc_lst->next;
330
331 dev = __dev_get_by_index(net, mc_lst->ifindex);
332 if (dev) {
333 struct inet6_dev *idev = __in6_dev_get(dev);
334
335 ip6_mc_leave_src(sk, mc_lst, idev);
336 if (idev)
337 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
338 } else {
339 ip6_mc_leave_src(sk, mc_lst, NULL);
340 }
341
342 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
343 kfree_rcu(mc_lst, rcu);
344 }
345 }
346
347 void ipv6_sock_mc_close(struct sock *sk)
348 {
349 struct ipv6_pinfo *np = inet6_sk(sk);
350
351 if (!rcu_access_pointer(np->ipv6_mc_list))
352 return;
353
354 rtnl_lock();
355 lock_sock(sk);
356 __ipv6_sock_mc_close(sk);
357 release_sock(sk);
358 rtnl_unlock();
359 }
360
361 int ip6_mc_source(int add, int omode, struct sock *sk,
362 struct group_source_req *pgsr)
363 {
364 struct in6_addr *source, *group;
365 struct ipv6_mc_socklist *pmc;
366 struct inet6_dev *idev;
367 struct ipv6_pinfo *inet6 = inet6_sk(sk);
368 struct ip6_sf_socklist *psl;
369 struct net *net = sock_net(sk);
370 int i, j, rv;
371 int leavegroup = 0;
372 int err;
373
374 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
375 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
376
377 if (!ipv6_addr_is_multicast(group))
378 return -EINVAL;
379
380 idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface);
381 if (!idev)
382 return -ENODEV;
383
384 err = -EADDRNOTAVAIL;
385
386 mutex_lock(&idev->mc_lock);
387 for_each_pmc_socklock(inet6, sk, pmc) {
388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
389 continue;
390 if (ipv6_addr_equal(&pmc->addr, group))
391 break;
392 }
393 if (!pmc) { /* must have a prior join */
394 err = -EINVAL;
395 goto done;
396 }
397 /* if a source filter was set, must be the same mode as before */
398 if (rcu_access_pointer(pmc->sflist)) {
399 if (pmc->sfmode != omode) {
400 err = -EINVAL;
401 goto done;
402 }
403 } else if (pmc->sfmode != omode) {
404 /* allow mode switches for empty-set filters */
405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
407 pmc->sfmode = omode;
408 }
409
410 psl = sock_dereference(pmc->sflist, sk);
411 if (!add) {
412 if (!psl)
413 goto done; /* err = -EADDRNOTAVAIL */
414 rv = !0;
415 for (i = 0; i < psl->sl_count; i++) {
416 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
417 if (rv == 0)
418 break;
419 }
420 if (rv) /* source not found */
421 goto done; /* err = -EADDRNOTAVAIL */
422
423 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
424 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
425 leavegroup = 1;
426 goto done;
427 }
428
429 /* update the interface filter */
430 ip6_mc_del_src(idev, group, omode, 1, source, 1);
431
432 for (j = i+1; j < psl->sl_count; j++)
433 psl->sl_addr[j-1] = psl->sl_addr[j];
434 psl->sl_count--;
435 err = 0;
436 goto done;
437 }
438 /* else, add a new source to the filter */
439
440 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
441 err = -ENOBUFS;
442 goto done;
443 }
444 if (!psl || psl->sl_count == psl->sl_max) {
445 struct ip6_sf_socklist *newpsl;
446 int count = IP6_SFBLOCK;
447
448 if (psl)
449 count += psl->sl_max;
450 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count),
451 GFP_KERNEL);
452 if (!newpsl) {
453 err = -ENOBUFS;
454 goto done;
455 }
456 newpsl->sl_max = count;
457 newpsl->sl_count = count - IP6_SFBLOCK;
458 if (psl) {
459 for (i = 0; i < psl->sl_count; i++)
460 newpsl->sl_addr[i] = psl->sl_addr[i];
461 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
462 &sk->sk_omem_alloc);
463 }
464 rcu_assign_pointer(pmc->sflist, newpsl);
465 kfree_rcu(psl, rcu);
466 psl = newpsl;
467 }
468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
469 for (i = 0; i < psl->sl_count; i++) {
470 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
471 if (rv == 0) /* There is an error in the address. */
472 goto done;
473 }
474 for (j = psl->sl_count-1; j >= i; j--)
475 psl->sl_addr[j+1] = psl->sl_addr[j];
476 psl->sl_addr[i] = *source;
477 psl->sl_count++;
478 err = 0;
479 /* update the interface list */
480 ip6_mc_add_src(idev, group, omode, 1, source, 1);
481 done:
482 mutex_unlock(&idev->mc_lock);
483 if (leavegroup)
484 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
485 return err;
486 }
487
488 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
489 struct sockaddr_storage *list)
490 {
491 const struct in6_addr *group;
492 struct ipv6_mc_socklist *pmc;
493 struct inet6_dev *idev;
494 struct ipv6_pinfo *inet6 = inet6_sk(sk);
495 struct ip6_sf_socklist *newpsl, *psl;
496 struct net *net = sock_net(sk);
497 int leavegroup = 0;
498 int i, err;
499
500 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
501
502 if (!ipv6_addr_is_multicast(group))
503 return -EINVAL;
504 if (gsf->gf_fmode != MCAST_INCLUDE &&
505 gsf->gf_fmode != MCAST_EXCLUDE)
506 return -EINVAL;
507
508 idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface);
509 if (!idev)
510 return -ENODEV;
511
512 err = 0;
513
514 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
515 leavegroup = 1;
516 goto done;
517 }
518
519 for_each_pmc_socklock(inet6, sk, pmc) {
520 if (pmc->ifindex != gsf->gf_interface)
521 continue;
522 if (ipv6_addr_equal(&pmc->addr, group))
523 break;
524 }
525 if (!pmc) { /* must have a prior join */
526 err = -EINVAL;
527 goto done;
528 }
529 if (gsf->gf_numsrc) {
530 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr,
531 gsf->gf_numsrc),
532 GFP_KERNEL);
533 if (!newpsl) {
534 err = -ENOBUFS;
535 goto done;
536 }
537 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
538 for (i = 0; i < newpsl->sl_count; ++i, ++list) {
539 struct sockaddr_in6 *psin6;
540
541 psin6 = (struct sockaddr_in6 *)list;
542 newpsl->sl_addr[i] = psin6->sin6_addr;
543 }
544 mutex_lock(&idev->mc_lock);
545 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
546 newpsl->sl_count, newpsl->sl_addr, 0);
547 if (err) {
548 mutex_unlock(&idev->mc_lock);
549 sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr,
550 newpsl->sl_max));
551 goto done;
552 }
553 mutex_unlock(&idev->mc_lock);
554 } else {
555 newpsl = NULL;
556 mutex_lock(&idev->mc_lock);
557 ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
558 mutex_unlock(&idev->mc_lock);
559 }
560
561 mutex_lock(&idev->mc_lock);
562 psl = sock_dereference(pmc->sflist, sk);
563 if (psl) {
564 ip6_mc_del_src(idev, group, pmc->sfmode,
565 psl->sl_count, psl->sl_addr, 0);
566 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
567 &sk->sk_omem_alloc);
568 } else {
569 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
570 }
571 rcu_assign_pointer(pmc->sflist, newpsl);
572 mutex_unlock(&idev->mc_lock);
573 kfree_rcu(psl, rcu);
574 pmc->sfmode = gsf->gf_fmode;
575 err = 0;
576 done:
577 if (leavegroup)
578 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
579 return err;
580 }
581
582 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
583 struct sockaddr_storage __user *p)
584 {
585 struct ipv6_pinfo *inet6 = inet6_sk(sk);
586 const struct in6_addr *group;
587 struct ipv6_mc_socklist *pmc;
588 struct ip6_sf_socklist *psl;
589 int i, count, copycount;
590
591 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
592
593 if (!ipv6_addr_is_multicast(group))
594 return -EINVAL;
595
596 /* changes to the ipv6_mc_list require the socket lock and
597 * rtnl lock. We have the socket lock, so reading the list is safe.
598 */
599
600 for_each_pmc_socklock(inet6, sk, pmc) {
601 if (pmc->ifindex != gsf->gf_interface)
602 continue;
603 if (ipv6_addr_equal(group, &pmc->addr))
604 break;
605 }
606 if (!pmc) /* must have a prior join */
607 return -EADDRNOTAVAIL;
608
609 gsf->gf_fmode = pmc->sfmode;
610 psl = sock_dereference(pmc->sflist, sk);
611 count = psl ? psl->sl_count : 0;
612
613 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
614 gsf->gf_numsrc = count;
615
616 for (i = 0; i < copycount; i++, p++) {
617 struct sockaddr_in6 *psin6;
618 struct sockaddr_storage ss;
619
620 psin6 = (struct sockaddr_in6 *)&ss;
621 memset(&ss, 0, sizeof(ss));
622 psin6->sin6_family = AF_INET6;
623 psin6->sin6_addr = psl->sl_addr[i];
624 if (copy_to_user(p, &ss, sizeof(ss)))
625 return -EFAULT;
626 }
627 return 0;
628 }
629
630 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
631 const struct in6_addr *src_addr)
632 {
633 struct ipv6_pinfo *np = inet6_sk(sk);
634 struct ipv6_mc_socklist *mc;
635 struct ip6_sf_socklist *psl;
636 bool rv = true;
637
638 rcu_read_lock();
639 for_each_pmc_rcu(np, mc) {
640 if (ipv6_addr_equal(&mc->addr, mc_addr))
641 break;
642 }
643 if (!mc) {
644 rcu_read_unlock();
645 return np->mc_all;
646 }
647 psl = rcu_dereference(mc->sflist);
648 if (!psl) {
649 rv = mc->sfmode == MCAST_EXCLUDE;
650 } else {
651 int i;
652
653 for (i = 0; i < psl->sl_count; i++) {
654 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
655 break;
656 }
657 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
658 rv = false;
659 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
660 rv = false;
661 }
662 rcu_read_unlock();
663
664 return rv;
665 }
666
667 /* called with mc_lock */
668 static void igmp6_group_added(struct ifmcaddr6 *mc)
669 {
670 struct net_device *dev = mc->idev->dev;
671 char buf[MAX_ADDR_LEN];
672
673 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
674 IPV6_ADDR_SCOPE_LINKLOCAL)
675 return;
676
677 if (!(mc->mca_flags&MAF_LOADED)) {
678 mc->mca_flags |= MAF_LOADED;
679 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
680 dev_mc_add(dev, buf);
681 }
682
683 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
684 return;
685
686 if (mld_in_v1_mode(mc->idev)) {
687 igmp6_join_group(mc);
688 return;
689 }
690 /* else v2 */
691
692 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
693 * should not send filter-mode change record as the mode
694 * should be from IN() to IN(A).
695 */
696 if (mc->mca_sfmode == MCAST_EXCLUDE)
697 mc->mca_crcount = mc->idev->mc_qrv;
698
699 mld_ifc_event(mc->idev);
700 }
701
702 /* called with mc_lock */
703 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
704 {
705 struct net_device *dev = mc->idev->dev;
706 char buf[MAX_ADDR_LEN];
707
708 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
709 IPV6_ADDR_SCOPE_LINKLOCAL)
710 return;
711
712 if (mc->mca_flags&MAF_LOADED) {
713 mc->mca_flags &= ~MAF_LOADED;
714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
715 dev_mc_del(dev, buf);
716 }
717
718 if (mc->mca_flags & MAF_NOREPORT)
719 return;
720
721 if (!mc->idev->dead)
722 igmp6_leave_group(mc);
723
724 if (cancel_delayed_work(&mc->mca_work))
725 refcount_dec(&mc->mca_refcnt);
726 }
727
728 /*
729 * deleted ifmcaddr6 manipulation
730 * called with mc_lock
731 */
732 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
733 {
734 struct ifmcaddr6 *pmc;
735
736 /* this is an "ifmcaddr6" for convenience; only the fields below
737 * are actually used. In particular, the refcnt and users are not
738 * used for management of the delete list. Using the same structure
739 * for deleted items allows change reports to use common code with
740 * non-deleted or query-response MCA's.
741 */
742 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
743 if (!pmc)
744 return;
745
746 pmc->idev = im->idev;
747 in6_dev_hold(idev);
748 pmc->mca_addr = im->mca_addr;
749 pmc->mca_crcount = idev->mc_qrv;
750 pmc->mca_sfmode = im->mca_sfmode;
751 if (pmc->mca_sfmode == MCAST_INCLUDE) {
752 struct ip6_sf_list *psf;
753
754 rcu_assign_pointer(pmc->mca_tomb,
755 mc_dereference(im->mca_tomb, idev));
756 rcu_assign_pointer(pmc->mca_sources,
757 mc_dereference(im->mca_sources, idev));
758 RCU_INIT_POINTER(im->mca_tomb, NULL);
759 RCU_INIT_POINTER(im->mca_sources, NULL);
760
761 for_each_psf_mclock(pmc, psf)
762 psf->sf_crcount = pmc->mca_crcount;
763 }
764
765 rcu_assign_pointer(pmc->next, idev->mc_tomb);
766 rcu_assign_pointer(idev->mc_tomb, pmc);
767 }
768
769 /* called with mc_lock */
770 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
771 {
772 struct ip6_sf_list *psf, *sources, *tomb;
773 struct in6_addr *pmca = &im->mca_addr;
774 struct ifmcaddr6 *pmc, *pmc_prev;
775
776 pmc_prev = NULL;
777 for_each_mc_tomb(idev, pmc) {
778 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
779 break;
780 pmc_prev = pmc;
781 }
782 if (pmc) {
783 if (pmc_prev)
784 rcu_assign_pointer(pmc_prev->next, pmc->next);
785 else
786 rcu_assign_pointer(idev->mc_tomb, pmc->next);
787 }
788
789 if (pmc) {
790 im->idev = pmc->idev;
791 if (im->mca_sfmode == MCAST_INCLUDE) {
792 tomb = rcu_replace_pointer(im->mca_tomb,
793 mc_dereference(pmc->mca_tomb, pmc->idev),
794 lockdep_is_held(&im->idev->mc_lock));
795 rcu_assign_pointer(pmc->mca_tomb, tomb);
796
797 sources = rcu_replace_pointer(im->mca_sources,
798 mc_dereference(pmc->mca_sources, pmc->idev),
799 lockdep_is_held(&im->idev->mc_lock));
800 rcu_assign_pointer(pmc->mca_sources, sources);
801 for_each_psf_mclock(im, psf)
802 psf->sf_crcount = idev->mc_qrv;
803 } else {
804 im->mca_crcount = idev->mc_qrv;
805 }
806 in6_dev_put(pmc->idev);
807 ip6_mc_clear_src(pmc);
808 kfree_rcu(pmc, rcu);
809 }
810 }
811
812 /* called with mc_lock */
813 static void mld_clear_delrec(struct inet6_dev *idev)
814 {
815 struct ifmcaddr6 *pmc, *nextpmc;
816
817 pmc = mc_dereference(idev->mc_tomb, idev);
818 RCU_INIT_POINTER(idev->mc_tomb, NULL);
819
820 for (; pmc; pmc = nextpmc) {
821 nextpmc = mc_dereference(pmc->next, idev);
822 ip6_mc_clear_src(pmc);
823 in6_dev_put(pmc->idev);
824 kfree_rcu(pmc, rcu);
825 }
826
827 /* clear dead sources, too */
828 for_each_mc_mclock(idev, pmc) {
829 struct ip6_sf_list *psf, *psf_next;
830
831 psf = mc_dereference(pmc->mca_tomb, idev);
832 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
833 for (; psf; psf = psf_next) {
834 psf_next = mc_dereference(psf->sf_next, idev);
835 kfree_rcu(psf, rcu);
836 }
837 }
838 }
839
840 static void mld_clear_query(struct inet6_dev *idev)
841 {
842 struct sk_buff *skb;
843
844 spin_lock_bh(&idev->mc_query_lock);
845 while ((skb = __skb_dequeue(&idev->mc_query_queue)))
846 kfree_skb(skb);
847 spin_unlock_bh(&idev->mc_query_lock);
848 }
849
850 static void mld_clear_report(struct inet6_dev *idev)
851 {
852 struct sk_buff *skb;
853
854 spin_lock_bh(&idev->mc_report_lock);
855 while ((skb = __skb_dequeue(&idev->mc_report_queue)))
856 kfree_skb(skb);
857 spin_unlock_bh(&idev->mc_report_lock);
858 }
859
860 static void mca_get(struct ifmcaddr6 *mc)
861 {
862 refcount_inc(&mc->mca_refcnt);
863 }
864
865 static void ma_put(struct ifmcaddr6 *mc)
866 {
867 if (refcount_dec_and_test(&mc->mca_refcnt)) {
868 in6_dev_put(mc->idev);
869 kfree_rcu(mc, rcu);
870 }
871 }
872
873 /* called with mc_lock */
874 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
875 const struct in6_addr *addr,
876 unsigned int mode)
877 {
878 struct ifmcaddr6 *mc;
879
880 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
881 if (!mc)
882 return NULL;
883
884 INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work);
885
886 mc->mca_addr = *addr;
887 mc->idev = idev; /* reference taken by caller */
888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 refcount_set(&mc->mca_refcnt, 1);
892
893 mc->mca_sfmode = mode;
894 mc->mca_sfcount[mode] = 1;
895
896 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
897 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
898 mc->mca_flags |= MAF_NOREPORT;
899
900 return mc;
901 }
902
903 /*
904 * device multicast group inc (add if not found)
905 */
906 static int __ipv6_dev_mc_inc(struct net_device *dev,
907 const struct in6_addr *addr, unsigned int mode)
908 {
909 struct ifmcaddr6 *mc;
910 struct inet6_dev *idev;
911
912 ASSERT_RTNL();
913
914 /* we need to take a reference on idev */
915 idev = in6_dev_get(dev);
916
917 if (!idev)
918 return -EINVAL;
919
920 if (idev->dead) {
921 in6_dev_put(idev);
922 return -ENODEV;
923 }
924
925 mutex_lock(&idev->mc_lock);
926 for_each_mc_mclock(idev, mc) {
927 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
928 mc->mca_users++;
929 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
930 mutex_unlock(&idev->mc_lock);
931 in6_dev_put(idev);
932 return 0;
933 }
934 }
935
936 mc = mca_alloc(idev, addr, mode);
937 if (!mc) {
938 mutex_unlock(&idev->mc_lock);
939 in6_dev_put(idev);
940 return -ENOMEM;
941 }
942
943 rcu_assign_pointer(mc->next, idev->mc_list);
944 rcu_assign_pointer(idev->mc_list, mc);
945
946 mca_get(mc);
947
948 mld_del_delrec(idev, mc);
949 igmp6_group_added(mc);
950 mutex_unlock(&idev->mc_lock);
951 ma_put(mc);
952 return 0;
953 }
954
955 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
956 {
957 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
958 }
959 EXPORT_SYMBOL(ipv6_dev_mc_inc);
960
961 /*
962 * device multicast group del
963 */
964 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
965 {
966 struct ifmcaddr6 *ma, __rcu **map;
967
968 ASSERT_RTNL();
969
970 mutex_lock(&idev->mc_lock);
971 for (map = &idev->mc_list;
972 (ma = mc_dereference(*map, idev));
973 map = &ma->next) {
974 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
975 if (--ma->mca_users == 0) {
976 *map = ma->next;
977
978 igmp6_group_dropped(ma);
979 ip6_mc_clear_src(ma);
980 mutex_unlock(&idev->mc_lock);
981
982 ma_put(ma);
983 return 0;
984 }
985 mutex_unlock(&idev->mc_lock);
986 return 0;
987 }
988 }
989
990 mutex_unlock(&idev->mc_lock);
991 return -ENOENT;
992 }
993
994 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
995 {
996 struct inet6_dev *idev;
997 int err;
998
999 ASSERT_RTNL();
1000
1001 idev = __in6_dev_get(dev);
1002 if (!idev)
1003 err = -ENODEV;
1004 else
1005 err = __ipv6_dev_mc_dec(idev, addr);
1006
1007 return err;
1008 }
1009 EXPORT_SYMBOL(ipv6_dev_mc_dec);
1010
1011 /*
1012 * check if the interface/address pair is valid
1013 */
1014 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1015 const struct in6_addr *src_addr)
1016 {
1017 struct inet6_dev *idev;
1018 struct ifmcaddr6 *mc;
1019 bool rv = false;
1020
1021 rcu_read_lock();
1022 idev = __in6_dev_get(dev);
1023 if (idev) {
1024 for_each_mc_rcu(idev, mc) {
1025 if (ipv6_addr_equal(&mc->mca_addr, group))
1026 break;
1027 }
1028 if (mc) {
1029 if (src_addr && !ipv6_addr_any(src_addr)) {
1030 struct ip6_sf_list *psf;
1031
1032 for_each_psf_rcu(mc, psf) {
1033 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1034 break;
1035 }
1036 if (psf)
1037 rv = psf->sf_count[MCAST_INCLUDE] ||
1038 psf->sf_count[MCAST_EXCLUDE] !=
1039 mc->mca_sfcount[MCAST_EXCLUDE];
1040 else
1041 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1042 } else
1043 rv = true; /* don't filter unspecified source */
1044 }
1045 }
1046 rcu_read_unlock();
1047 return rv;
1048 }
1049
1050 /* called with mc_lock */
1051 static void mld_gq_start_work(struct inet6_dev *idev)
1052 {
1053 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1054
1055 idev->mc_gq_running = 1;
1056 if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
1057 in6_dev_hold(idev);
1058 }
1059
1060 /* called with mc_lock */
1061 static void mld_gq_stop_work(struct inet6_dev *idev)
1062 {
1063 idev->mc_gq_running = 0;
1064 if (cancel_delayed_work(&idev->mc_gq_work))
1065 __in6_dev_put(idev);
1066 }
1067
1068 /* called with mc_lock */
1069 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
1070 {
1071 unsigned long tv = prandom_u32() % delay;
1072
1073 if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
1074 in6_dev_hold(idev);
1075 }
1076
1077 /* called with mc_lock */
1078 static void mld_ifc_stop_work(struct inet6_dev *idev)
1079 {
1080 idev->mc_ifc_count = 0;
1081 if (cancel_delayed_work(&idev->mc_ifc_work))
1082 __in6_dev_put(idev);
1083 }
1084
1085 /* called with mc_lock */
1086 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
1087 {
1088 unsigned long tv = prandom_u32() % delay;
1089
1090 if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
1091 in6_dev_hold(idev);
1092 }
1093
1094 static void mld_dad_stop_work(struct inet6_dev *idev)
1095 {
1096 if (cancel_delayed_work(&idev->mc_dad_work))
1097 __in6_dev_put(idev);
1098 }
1099
1100 static void mld_query_stop_work(struct inet6_dev *idev)
1101 {
1102 spin_lock_bh(&idev->mc_query_lock);
1103 if (cancel_delayed_work(&idev->mc_query_work))
1104 __in6_dev_put(idev);
1105 spin_unlock_bh(&idev->mc_query_lock);
1106 }
1107
1108 static void mld_report_stop_work(struct inet6_dev *idev)
1109 {
1110 if (cancel_delayed_work_sync(&idev->mc_report_work))
1111 __in6_dev_put(idev);
1112 }
1113
1114 /*
1115 * IGMP handling (alias multicast ICMPv6 messages)
1116 * called with mc_lock
1117 */
1118 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1119 {
1120 unsigned long delay = resptime;
1121
1122 /* Do not start work for these addresses */
1123 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1124 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1125 return;
1126
1127 if (cancel_delayed_work(&ma->mca_work)) {
1128 refcount_dec(&ma->mca_refcnt);
1129 delay = ma->mca_work.timer.expires - jiffies;
1130 }
1131
1132 if (delay >= resptime)
1133 delay = prandom_u32() % resptime;
1134
1135 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
1136 refcount_inc(&ma->mca_refcnt);
1137 ma->mca_flags |= MAF_TIMER_RUNNING;
1138 }
1139
1140 /* mark EXCLUDE-mode sources
1141 * called with mc_lock
1142 */
1143 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1144 const struct in6_addr *srcs)
1145 {
1146 struct ip6_sf_list *psf;
1147 int i, scount;
1148
1149 scount = 0;
1150 for_each_psf_mclock(pmc, psf) {
1151 if (scount == nsrcs)
1152 break;
1153 for (i = 0; i < nsrcs; i++) {
1154 /* skip inactive filters */
1155 if (psf->sf_count[MCAST_INCLUDE] ||
1156 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1157 psf->sf_count[MCAST_EXCLUDE])
1158 break;
1159 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1160 scount++;
1161 break;
1162 }
1163 }
1164 }
1165 pmc->mca_flags &= ~MAF_GSQUERY;
1166 if (scount == nsrcs) /* all sources excluded */
1167 return false;
1168 return true;
1169 }
1170
1171 /* called with mc_lock */
1172 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1173 const struct in6_addr *srcs)
1174 {
1175 struct ip6_sf_list *psf;
1176 int i, scount;
1177
1178 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1179 return mld_xmarksources(pmc, nsrcs, srcs);
1180
1181 /* mark INCLUDE-mode sources */
1182
1183 scount = 0;
1184 for_each_psf_mclock(pmc, psf) {
1185 if (scount == nsrcs)
1186 break;
1187 for (i = 0; i < nsrcs; i++) {
1188 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1189 psf->sf_gsresp = 1;
1190 scount++;
1191 break;
1192 }
1193 }
1194 }
1195 if (!scount) {
1196 pmc->mca_flags &= ~MAF_GSQUERY;
1197 return false;
1198 }
1199 pmc->mca_flags |= MAF_GSQUERY;
1200 return true;
1201 }
1202
1203 static int mld_force_mld_version(const struct inet6_dev *idev)
1204 {
1205 /* Normally, both are 0 here. If enforcement to a particular is
1206 * being used, individual device enforcement will have a lower
1207 * precedence over 'all' device (.../conf/all/force_mld_version).
1208 */
1209
1210 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1211 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1212 else
1213 return idev->cnf.force_mld_version;
1214 }
1215
1216 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1217 {
1218 return mld_force_mld_version(idev) == 2;
1219 }
1220
1221 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1222 {
1223 return mld_force_mld_version(idev) == 1;
1224 }
1225
1226 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1227 {
1228 if (mld_in_v2_mode_only(idev))
1229 return false;
1230 if (mld_in_v1_mode_only(idev))
1231 return true;
1232 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1233 return true;
1234
1235 return false;
1236 }
1237
1238 static void mld_set_v1_mode(struct inet6_dev *idev)
1239 {
1240 /* RFC3810, relevant sections:
1241 * - 9.1. Robustness Variable
1242 * - 9.2. Query Interval
1243 * - 9.3. Query Response Interval
1244 * - 9.12. Older Version Querier Present Timeout
1245 */
1246 unsigned long switchback;
1247
1248 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1249
1250 idev->mc_v1_seen = jiffies + switchback;
1251 }
1252
1253 static void mld_update_qrv(struct inet6_dev *idev,
1254 const struct mld2_query *mlh2)
1255 {
1256 /* RFC3810, relevant sections:
1257 * - 5.1.8. QRV (Querier's Robustness Variable)
1258 * - 9.1. Robustness Variable
1259 */
1260
1261 /* The value of the Robustness Variable MUST NOT be zero,
1262 * and SHOULD NOT be one. Catch this here if we ever run
1263 * into such a case in future.
1264 */
1265 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1266 WARN_ON(idev->mc_qrv == 0);
1267
1268 if (mlh2->mld2q_qrv > 0)
1269 idev->mc_qrv = mlh2->mld2q_qrv;
1270
1271 if (unlikely(idev->mc_qrv < min_qrv)) {
1272 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1273 idev->mc_qrv, min_qrv);
1274 idev->mc_qrv = min_qrv;
1275 }
1276 }
1277
1278 static void mld_update_qi(struct inet6_dev *idev,
1279 const struct mld2_query *mlh2)
1280 {
1281 /* RFC3810, relevant sections:
1282 * - 5.1.9. QQIC (Querier's Query Interval Code)
1283 * - 9.2. Query Interval
1284 * - 9.12. Older Version Querier Present Timeout
1285 * (the [Query Interval] in the last Query received)
1286 */
1287 unsigned long mc_qqi;
1288
1289 if (mlh2->mld2q_qqic < 128) {
1290 mc_qqi = mlh2->mld2q_qqic;
1291 } else {
1292 unsigned long mc_man, mc_exp;
1293
1294 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1295 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1296
1297 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1298 }
1299
1300 idev->mc_qi = mc_qqi * HZ;
1301 }
1302
1303 static void mld_update_qri(struct inet6_dev *idev,
1304 const struct mld2_query *mlh2)
1305 {
1306 /* RFC3810, relevant sections:
1307 * - 5.1.3. Maximum Response Code
1308 * - 9.3. Query Response Interval
1309 */
1310 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1311 }
1312
1313 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1314 unsigned long *max_delay, bool v1_query)
1315 {
1316 unsigned long mldv1_md;
1317
1318 /* Ignore v1 queries */
1319 if (mld_in_v2_mode_only(idev))
1320 return -EINVAL;
1321
1322 mldv1_md = ntohs(mld->mld_maxdelay);
1323
1324 /* When in MLDv1 fallback and a MLDv2 router start-up being
1325 * unaware of current MLDv1 operation, the MRC == MRD mapping
1326 * only works when the exponential algorithm is not being
1327 * used (as MLDv1 is unaware of such things).
1328 *
1329 * According to the RFC author, the MLDv2 implementations
1330 * he's aware of all use a MRC < 32768 on start up queries.
1331 *
1332 * Thus, should we *ever* encounter something else larger
1333 * than that, just assume the maximum possible within our
1334 * reach.
1335 */
1336 if (!v1_query)
1337 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1338
1339 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1340
1341 /* MLDv1 router present: we need to go into v1 mode *only*
1342 * when an MLDv1 query is received as per section 9.12. of
1343 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1344 * queries MUST be of exactly 24 octets.
1345 */
1346 if (v1_query)
1347 mld_set_v1_mode(idev);
1348
1349 /* cancel MLDv2 report work */
1350 mld_gq_stop_work(idev);
1351 /* cancel the interface change work */
1352 mld_ifc_stop_work(idev);
1353 /* clear deleted report items */
1354 mld_clear_delrec(idev);
1355
1356 return 0;
1357 }
1358
1359 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1360 unsigned long *max_delay)
1361 {
1362 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1363
1364 mld_update_qrv(idev, mld);
1365 mld_update_qi(idev, mld);
1366 mld_update_qri(idev, mld);
1367
1368 idev->mc_maxdelay = *max_delay;
1369
1370 return;
1371 }
1372
1373 /* called with rcu_read_lock() */
1374 void igmp6_event_query(struct sk_buff *skb)
1375 {
1376 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1377
1378 if (!idev || idev->dead)
1379 goto out;
1380
1381 spin_lock_bh(&idev->mc_query_lock);
1382 if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) {
1383 __skb_queue_tail(&idev->mc_query_queue, skb);
1384 if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0))
1385 in6_dev_hold(idev);
1386 skb = NULL;
1387 }
1388 spin_unlock_bh(&idev->mc_query_lock);
1389 out:
1390 kfree_skb(skb);
1391 }
1392
1393 static void __mld_query_work(struct sk_buff *skb)
1394 {
1395 struct mld2_query *mlh2 = NULL;
1396 const struct in6_addr *group;
1397 unsigned long max_delay;
1398 struct inet6_dev *idev;
1399 struct ifmcaddr6 *ma;
1400 struct mld_msg *mld;
1401 int group_type;
1402 int mark = 0;
1403 int len, err;
1404
1405 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1406 goto kfree_skb;
1407
1408 /* compute payload length excluding extension headers */
1409 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1410 len -= skb_network_header_len(skb);
1411
1412 /* RFC3810 6.2
1413 * Upon reception of an MLD message that contains a Query, the node
1414 * checks if the source address of the message is a valid link-local
1415 * address, if the Hop Limit is set to 1, and if the Router Alert
1416 * option is present in the Hop-By-Hop Options header of the IPv6
1417 * packet. If any of these checks fails, the packet is dropped.
1418 */
1419 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1420 ipv6_hdr(skb)->hop_limit != 1 ||
1421 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1422 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1423 goto kfree_skb;
1424
1425 idev = in6_dev_get(skb->dev);
1426 if (!idev)
1427 goto kfree_skb;
1428
1429 mld = (struct mld_msg *)icmp6_hdr(skb);
1430 group = &mld->mld_mca;
1431 group_type = ipv6_addr_type(group);
1432
1433 if (group_type != IPV6_ADDR_ANY &&
1434 !(group_type&IPV6_ADDR_MULTICAST))
1435 goto out;
1436
1437 if (len < MLD_V1_QUERY_LEN) {
1438 goto out;
1439 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1440 err = mld_process_v1(idev, mld, &max_delay,
1441 len == MLD_V1_QUERY_LEN);
1442 if (err < 0)
1443 goto out;
1444 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1445 int srcs_offset = sizeof(struct mld2_query) -
1446 sizeof(struct icmp6hdr);
1447
1448 if (!pskb_may_pull(skb, srcs_offset))
1449 goto out;
1450
1451 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1452
1453 mld_process_v2(idev, mlh2, &max_delay);
1454
1455 if (group_type == IPV6_ADDR_ANY) { /* general query */
1456 if (mlh2->mld2q_nsrcs)
1457 goto out; /* no sources allowed */
1458
1459 mld_gq_start_work(idev);
1460 goto out;
1461 }
1462 /* mark sources to include, if group & source-specific */
1463 if (mlh2->mld2q_nsrcs != 0) {
1464 if (!pskb_may_pull(skb, srcs_offset +
1465 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1466 goto out;
1467
1468 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1469 mark = 1;
1470 }
1471 } else {
1472 goto out;
1473 }
1474
1475 if (group_type == IPV6_ADDR_ANY) {
1476 for_each_mc_mclock(idev, ma) {
1477 igmp6_group_queried(ma, max_delay);
1478 }
1479 } else {
1480 for_each_mc_mclock(idev, ma) {
1481 if (!ipv6_addr_equal(group, &ma->mca_addr))
1482 continue;
1483 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1484 /* gsquery <- gsquery && mark */
1485 if (!mark)
1486 ma->mca_flags &= ~MAF_GSQUERY;
1487 } else {
1488 /* gsquery <- mark */
1489 if (mark)
1490 ma->mca_flags |= MAF_GSQUERY;
1491 else
1492 ma->mca_flags &= ~MAF_GSQUERY;
1493 }
1494 if (!(ma->mca_flags & MAF_GSQUERY) ||
1495 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1496 igmp6_group_queried(ma, max_delay);
1497 break;
1498 }
1499 }
1500
1501 out:
1502 in6_dev_put(idev);
1503 kfree_skb:
1504 consume_skb(skb);
1505 }
1506
1507 static void mld_query_work(struct work_struct *work)
1508 {
1509 struct inet6_dev *idev = container_of(to_delayed_work(work),
1510 struct inet6_dev,
1511 mc_query_work);
1512 struct sk_buff_head q;
1513 struct sk_buff *skb;
1514 bool rework = false;
1515 int cnt = 0;
1516
1517 skb_queue_head_init(&q);
1518
1519 spin_lock_bh(&idev->mc_query_lock);
1520 while ((skb = __skb_dequeue(&idev->mc_query_queue))) {
1521 __skb_queue_tail(&q, skb);
1522
1523 if (++cnt >= MLD_MAX_QUEUE) {
1524 rework = true;
1525 schedule_delayed_work(&idev->mc_query_work, 0);
1526 break;
1527 }
1528 }
1529 spin_unlock_bh(&idev->mc_query_lock);
1530
1531 mutex_lock(&idev->mc_lock);
1532 while ((skb = __skb_dequeue(&q)))
1533 __mld_query_work(skb);
1534 mutex_unlock(&idev->mc_lock);
1535
1536 if (!rework)
1537 in6_dev_put(idev);
1538 }
1539
1540 /* called with rcu_read_lock() */
1541 void igmp6_event_report(struct sk_buff *skb)
1542 {
1543 struct inet6_dev *idev = __in6_dev_get(skb->dev);
1544
1545 if (!idev || idev->dead)
1546 goto out;
1547
1548 spin_lock_bh(&idev->mc_report_lock);
1549 if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) {
1550 __skb_queue_tail(&idev->mc_report_queue, skb);
1551 if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0))
1552 in6_dev_hold(idev);
1553 skb = NULL;
1554 }
1555 spin_unlock_bh(&idev->mc_report_lock);
1556 out:
1557 kfree_skb(skb);
1558 }
1559
1560 static void __mld_report_work(struct sk_buff *skb)
1561 {
1562 struct inet6_dev *idev;
1563 struct ifmcaddr6 *ma;
1564 struct mld_msg *mld;
1565 int addr_type;
1566
1567 /* Our own report looped back. Ignore it. */
1568 if (skb->pkt_type == PACKET_LOOPBACK)
1569 goto kfree_skb;
1570
1571 /* send our report if the MC router may not have heard this report */
1572 if (skb->pkt_type != PACKET_MULTICAST &&
1573 skb->pkt_type != PACKET_BROADCAST)
1574 goto kfree_skb;
1575
1576 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1577 goto kfree_skb;
1578
1579 mld = (struct mld_msg *)icmp6_hdr(skb);
1580
1581 /* Drop reports with not link local source */
1582 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1583 if (addr_type != IPV6_ADDR_ANY &&
1584 !(addr_type&IPV6_ADDR_LINKLOCAL))
1585 goto kfree_skb;
1586
1587 idev = in6_dev_get(skb->dev);
1588 if (!idev)
1589 goto kfree_skb;
1590
1591 /*
1592 * Cancel the work for this group
1593 */
1594
1595 for_each_mc_mclock(idev, ma) {
1596 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1597 if (cancel_delayed_work(&ma->mca_work))
1598 refcount_dec(&ma->mca_refcnt);
1599 ma->mca_flags &= ~(MAF_LAST_REPORTER |
1600 MAF_TIMER_RUNNING);
1601 break;
1602 }
1603 }
1604
1605 in6_dev_put(idev);
1606 kfree_skb:
1607 consume_skb(skb);
1608 }
1609
1610 static void mld_report_work(struct work_struct *work)
1611 {
1612 struct inet6_dev *idev = container_of(to_delayed_work(work),
1613 struct inet6_dev,
1614 mc_report_work);
1615 struct sk_buff_head q;
1616 struct sk_buff *skb;
1617 bool rework = false;
1618 int cnt = 0;
1619
1620 skb_queue_head_init(&q);
1621 spin_lock_bh(&idev->mc_report_lock);
1622 while ((skb = __skb_dequeue(&idev->mc_report_queue))) {
1623 __skb_queue_tail(&q, skb);
1624
1625 if (++cnt >= MLD_MAX_QUEUE) {
1626 rework = true;
1627 schedule_delayed_work(&idev->mc_report_work, 0);
1628 break;
1629 }
1630 }
1631 spin_unlock_bh(&idev->mc_report_lock);
1632
1633 mutex_lock(&idev->mc_lock);
1634 while ((skb = __skb_dequeue(&q)))
1635 __mld_report_work(skb);
1636 mutex_unlock(&idev->mc_lock);
1637
1638 if (!rework)
1639 in6_dev_put(idev);
1640 }
1641
1642 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1643 int gdeleted, int sdeleted)
1644 {
1645 switch (type) {
1646 case MLD2_MODE_IS_INCLUDE:
1647 case MLD2_MODE_IS_EXCLUDE:
1648 if (gdeleted || sdeleted)
1649 return false;
1650 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1651 if (pmc->mca_sfmode == MCAST_INCLUDE)
1652 return true;
1653 /* don't include if this source is excluded
1654 * in all filters
1655 */
1656 if (psf->sf_count[MCAST_INCLUDE])
1657 return type == MLD2_MODE_IS_INCLUDE;
1658 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1659 psf->sf_count[MCAST_EXCLUDE];
1660 }
1661 return false;
1662 case MLD2_CHANGE_TO_INCLUDE:
1663 if (gdeleted || sdeleted)
1664 return false;
1665 return psf->sf_count[MCAST_INCLUDE] != 0;
1666 case MLD2_CHANGE_TO_EXCLUDE:
1667 if (gdeleted || sdeleted)
1668 return false;
1669 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1670 psf->sf_count[MCAST_INCLUDE])
1671 return false;
1672 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1673 psf->sf_count[MCAST_EXCLUDE];
1674 case MLD2_ALLOW_NEW_SOURCES:
1675 if (gdeleted || !psf->sf_crcount)
1676 return false;
1677 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1678 case MLD2_BLOCK_OLD_SOURCES:
1679 if (pmc->mca_sfmode == MCAST_INCLUDE)
1680 return gdeleted || (psf->sf_crcount && sdeleted);
1681 return psf->sf_crcount && !gdeleted && !sdeleted;
1682 }
1683 return false;
1684 }
1685
1686 static int
1687 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1688 {
1689 struct ip6_sf_list *psf;
1690 int scount = 0;
1691
1692 for_each_psf_mclock(pmc, psf) {
1693 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1694 continue;
1695 scount++;
1696 }
1697 return scount;
1698 }
1699
1700 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1701 struct net_device *dev,
1702 const struct in6_addr *saddr,
1703 const struct in6_addr *daddr,
1704 int proto, int len)
1705 {
1706 struct ipv6hdr *hdr;
1707
1708 skb->protocol = htons(ETH_P_IPV6);
1709 skb->dev = dev;
1710
1711 skb_reset_network_header(skb);
1712 skb_put(skb, sizeof(struct ipv6hdr));
1713 hdr = ipv6_hdr(skb);
1714
1715 ip6_flow_hdr(hdr, 0, 0);
1716
1717 hdr->payload_len = htons(len);
1718 hdr->nexthdr = proto;
1719 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1720
1721 hdr->saddr = *saddr;
1722 hdr->daddr = *daddr;
1723 }
1724
1725 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1726 {
1727 u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1728 2, 0, 0, IPV6_TLV_PADN, 0 };
1729 struct net_device *dev = idev->dev;
1730 int hlen = LL_RESERVED_SPACE(dev);
1731 int tlen = dev->needed_tailroom;
1732 struct net *net = dev_net(dev);
1733 const struct in6_addr *saddr;
1734 struct in6_addr addr_buf;
1735 struct mld2_report *pmr;
1736 struct sk_buff *skb;
1737 unsigned int size;
1738 struct sock *sk;
1739 int err;
1740
1741 sk = net->ipv6.igmp_sk;
1742 /* we assume size > sizeof(ra) here
1743 * Also try to not allocate high-order pages for big MTU
1744 */
1745 size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
1746 skb = sock_alloc_send_skb(sk, size, 1, &err);
1747 if (!skb)
1748 return NULL;
1749
1750 skb->priority = TC_PRIO_CONTROL;
1751 skb_reserve(skb, hlen);
1752 skb_tailroom_reserve(skb, mtu, tlen);
1753
1754 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1755 /* <draft-ietf-magma-mld-source-05.txt>:
1756 * use unspecified address as the source address
1757 * when a valid link-local address is not available.
1758 */
1759 saddr = &in6addr_any;
1760 } else
1761 saddr = &addr_buf;
1762
1763 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1764
1765 skb_put_data(skb, ra, sizeof(ra));
1766
1767 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1768 skb_put(skb, sizeof(*pmr));
1769 pmr = (struct mld2_report *)skb_transport_header(skb);
1770 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1771 pmr->mld2r_resv1 = 0;
1772 pmr->mld2r_cksum = 0;
1773 pmr->mld2r_resv2 = 0;
1774 pmr->mld2r_ngrec = 0;
1775 return skb;
1776 }
1777
1778 static void mld_sendpack(struct sk_buff *skb)
1779 {
1780 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1781 struct mld2_report *pmr =
1782 (struct mld2_report *)skb_transport_header(skb);
1783 int payload_len, mldlen;
1784 struct inet6_dev *idev;
1785 struct net *net = dev_net(skb->dev);
1786 int err;
1787 struct flowi6 fl6;
1788 struct dst_entry *dst;
1789
1790 rcu_read_lock();
1791 idev = __in6_dev_get(skb->dev);
1792 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1793
1794 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1795 sizeof(*pip6);
1796 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1797 pip6->payload_len = htons(payload_len);
1798
1799 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1800 IPPROTO_ICMPV6,
1801 csum_partial(skb_transport_header(skb),
1802 mldlen, 0));
1803
1804 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1805 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1806 skb->dev->ifindex);
1807 dst = icmp6_dst_alloc(skb->dev, &fl6);
1808
1809 err = 0;
1810 if (IS_ERR(dst)) {
1811 err = PTR_ERR(dst);
1812 dst = NULL;
1813 }
1814 skb_dst_set(skb, dst);
1815 if (err)
1816 goto err_out;
1817
1818 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1819 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1820 dst_output);
1821 out:
1822 if (!err) {
1823 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1824 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1825 } else {
1826 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1827 }
1828
1829 rcu_read_unlock();
1830 return;
1831
1832 err_out:
1833 kfree_skb(skb);
1834 goto out;
1835 }
1836
1837 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1838 {
1839 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1840 }
1841
1842 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1843 int type, struct mld2_grec **ppgr, unsigned int mtu)
1844 {
1845 struct mld2_report *pmr;
1846 struct mld2_grec *pgr;
1847
1848 if (!skb) {
1849 skb = mld_newpack(pmc->idev, mtu);
1850 if (!skb)
1851 return NULL;
1852 }
1853 pgr = skb_put(skb, sizeof(struct mld2_grec));
1854 pgr->grec_type = type;
1855 pgr->grec_auxwords = 0;
1856 pgr->grec_nsrcs = 0;
1857 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1858 pmr = (struct mld2_report *)skb_transport_header(skb);
1859 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1860 *ppgr = pgr;
1861 return skb;
1862 }
1863
1864 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1865
1866 /* called with mc_lock */
1867 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1868 int type, int gdeleted, int sdeleted,
1869 int crsend)
1870 {
1871 struct ip6_sf_list *psf, *psf_prev, *psf_next;
1872 int scount, stotal, first, isquery, truncate;
1873 struct ip6_sf_list __rcu **psf_list;
1874 struct inet6_dev *idev = pmc->idev;
1875 struct net_device *dev = idev->dev;
1876 struct mld2_grec *pgr = NULL;
1877 struct mld2_report *pmr;
1878 unsigned int mtu;
1879
1880 if (pmc->mca_flags & MAF_NOREPORT)
1881 return skb;
1882
1883 mtu = READ_ONCE(dev->mtu);
1884 if (mtu < IPV6_MIN_MTU)
1885 return skb;
1886
1887 isquery = type == MLD2_MODE_IS_INCLUDE ||
1888 type == MLD2_MODE_IS_EXCLUDE;
1889 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1890 type == MLD2_CHANGE_TO_EXCLUDE;
1891
1892 stotal = scount = 0;
1893
1894 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1895
1896 if (!rcu_access_pointer(*psf_list))
1897 goto empty_source;
1898
1899 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1900
1901 /* EX and TO_EX get a fresh packet, if needed */
1902 if (truncate) {
1903 if (pmr && pmr->mld2r_ngrec &&
1904 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1905 if (skb)
1906 mld_sendpack(skb);
1907 skb = mld_newpack(idev, mtu);
1908 }
1909 }
1910 first = 1;
1911 psf_prev = NULL;
1912 for (psf = mc_dereference(*psf_list, idev);
1913 psf;
1914 psf = psf_next) {
1915 struct in6_addr *psrc;
1916
1917 psf_next = mc_dereference(psf->sf_next, idev);
1918
1919 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1920 psf_prev = psf;
1921 continue;
1922 }
1923
1924 /* Based on RFC3810 6.1. Should not send source-list change
1925 * records when there is a filter mode change.
1926 */
1927 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1928 (!gdeleted && pmc->mca_crcount)) &&
1929 (type == MLD2_ALLOW_NEW_SOURCES ||
1930 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1931 goto decrease_sf_crcount;
1932
1933 /* clear marks on query responses */
1934 if (isquery)
1935 psf->sf_gsresp = 0;
1936
1937 if (AVAILABLE(skb) < sizeof(*psrc) +
1938 first*sizeof(struct mld2_grec)) {
1939 if (truncate && !first)
1940 break; /* truncate these */
1941 if (pgr)
1942 pgr->grec_nsrcs = htons(scount);
1943 if (skb)
1944 mld_sendpack(skb);
1945 skb = mld_newpack(idev, mtu);
1946 first = 1;
1947 scount = 0;
1948 }
1949 if (first) {
1950 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1951 first = 0;
1952 }
1953 if (!skb)
1954 return NULL;
1955 psrc = skb_put(skb, sizeof(*psrc));
1956 *psrc = psf->sf_addr;
1957 scount++; stotal++;
1958 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1959 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1960 decrease_sf_crcount:
1961 psf->sf_crcount--;
1962 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1963 if (psf_prev)
1964 rcu_assign_pointer(psf_prev->sf_next,
1965 mc_dereference(psf->sf_next, idev));
1966 else
1967 rcu_assign_pointer(*psf_list,
1968 mc_dereference(psf->sf_next, idev));
1969 kfree_rcu(psf, rcu);
1970 continue;
1971 }
1972 }
1973 psf_prev = psf;
1974 }
1975
1976 empty_source:
1977 if (!stotal) {
1978 if (type == MLD2_ALLOW_NEW_SOURCES ||
1979 type == MLD2_BLOCK_OLD_SOURCES)
1980 return skb;
1981 if (pmc->mca_crcount || isquery || crsend) {
1982 /* make sure we have room for group header */
1983 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1984 mld_sendpack(skb);
1985 skb = NULL; /* add_grhead will get a new one */
1986 }
1987 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1988 }
1989 }
1990 if (pgr)
1991 pgr->grec_nsrcs = htons(scount);
1992
1993 if (isquery)
1994 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1995 return skb;
1996 }
1997
1998 /* called with mc_lock */
1999 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2000 {
2001 struct sk_buff *skb = NULL;
2002 int type;
2003
2004 if (!pmc) {
2005 for_each_mc_mclock(idev, pmc) {
2006 if (pmc->mca_flags & MAF_NOREPORT)
2007 continue;
2008 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2009 type = MLD2_MODE_IS_EXCLUDE;
2010 else
2011 type = MLD2_MODE_IS_INCLUDE;
2012 skb = add_grec(skb, pmc, type, 0, 0, 0);
2013 }
2014 } else {
2015 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2016 type = MLD2_MODE_IS_EXCLUDE;
2017 else
2018 type = MLD2_MODE_IS_INCLUDE;
2019 skb = add_grec(skb, pmc, type, 0, 0, 0);
2020 }
2021 if (skb)
2022 mld_sendpack(skb);
2023 }
2024
2025 /*
2026 * remove zero-count source records from a source filter list
2027 * called with mc_lock
2028 */
2029 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
2030 {
2031 struct ip6_sf_list *psf_prev, *psf_next, *psf;
2032
2033 psf_prev = NULL;
2034 for (psf = mc_dereference(*ppsf, idev);
2035 psf;
2036 psf = psf_next) {
2037 psf_next = mc_dereference(psf->sf_next, idev);
2038 if (psf->sf_crcount == 0) {
2039 if (psf_prev)
2040 rcu_assign_pointer(psf_prev->sf_next,
2041 mc_dereference(psf->sf_next, idev));
2042 else
2043 rcu_assign_pointer(*ppsf,
2044 mc_dereference(psf->sf_next, idev));
2045 kfree_rcu(psf, rcu);
2046 } else {
2047 psf_prev = psf;
2048 }
2049 }
2050 }
2051
2052 /* called with mc_lock */
2053 static void mld_send_cr(struct inet6_dev *idev)
2054 {
2055 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2056 struct sk_buff *skb = NULL;
2057 int type, dtype;
2058
2059 /* deleted MCA's */
2060 pmc_prev = NULL;
2061 for (pmc = mc_dereference(idev->mc_tomb, idev);
2062 pmc;
2063 pmc = pmc_next) {
2064 pmc_next = mc_dereference(pmc->next, idev);
2065 if (pmc->mca_sfmode == MCAST_INCLUDE) {
2066 type = MLD2_BLOCK_OLD_SOURCES;
2067 dtype = MLD2_BLOCK_OLD_SOURCES;
2068 skb = add_grec(skb, pmc, type, 1, 0, 0);
2069 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
2070 }
2071 if (pmc->mca_crcount) {
2072 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2073 type = MLD2_CHANGE_TO_INCLUDE;
2074 skb = add_grec(skb, pmc, type, 1, 0, 0);
2075 }
2076 pmc->mca_crcount--;
2077 if (pmc->mca_crcount == 0) {
2078 mld_clear_zeros(&pmc->mca_tomb, idev);
2079 mld_clear_zeros(&pmc->mca_sources, idev);
2080 }
2081 }
2082 if (pmc->mca_crcount == 0 &&
2083 !rcu_access_pointer(pmc->mca_tomb) &&
2084 !rcu_access_pointer(pmc->mca_sources)) {
2085 if (pmc_prev)
2086 rcu_assign_pointer(pmc_prev->next, pmc_next);
2087 else
2088 rcu_assign_pointer(idev->mc_tomb, pmc_next);
2089 in6_dev_put(pmc->idev);
2090 kfree_rcu(pmc, rcu);
2091 } else
2092 pmc_prev = pmc;
2093 }
2094
2095 /* change recs */
2096 for_each_mc_mclock(idev, pmc) {
2097 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2098 type = MLD2_BLOCK_OLD_SOURCES;
2099 dtype = MLD2_ALLOW_NEW_SOURCES;
2100 } else {
2101 type = MLD2_ALLOW_NEW_SOURCES;
2102 dtype = MLD2_BLOCK_OLD_SOURCES;
2103 }
2104 skb = add_grec(skb, pmc, type, 0, 0, 0);
2105 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
2106
2107 /* filter mode changes */
2108 if (pmc->mca_crcount) {
2109 if (pmc->mca_sfmode == MCAST_EXCLUDE)
2110 type = MLD2_CHANGE_TO_EXCLUDE;
2111 else
2112 type = MLD2_CHANGE_TO_INCLUDE;
2113 skb = add_grec(skb, pmc, type, 0, 0, 0);
2114 pmc->mca_crcount--;
2115 }
2116 }
2117 if (!skb)
2118 return;
2119 (void) mld_sendpack(skb);
2120 }
2121
2122 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2123 {
2124 struct net *net = dev_net(dev);
2125 struct sock *sk = net->ipv6.igmp_sk;
2126 struct inet6_dev *idev;
2127 struct sk_buff *skb;
2128 struct mld_msg *hdr;
2129 const struct in6_addr *snd_addr, *saddr;
2130 struct in6_addr addr_buf;
2131 int hlen = LL_RESERVED_SPACE(dev);
2132 int tlen = dev->needed_tailroom;
2133 int err, len, payload_len, full_len;
2134 u8 ra[8] = { IPPROTO_ICMPV6, 0,
2135 IPV6_TLV_ROUTERALERT, 2, 0, 0,
2136 IPV6_TLV_PADN, 0 };
2137 struct flowi6 fl6;
2138 struct dst_entry *dst;
2139
2140 if (type == ICMPV6_MGM_REDUCTION)
2141 snd_addr = &in6addr_linklocal_allrouters;
2142 else
2143 snd_addr = addr;
2144
2145 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2146 payload_len = len + sizeof(ra);
2147 full_len = sizeof(struct ipv6hdr) + payload_len;
2148
2149 rcu_read_lock();
2150 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2151 IPSTATS_MIB_OUT, full_len);
2152 rcu_read_unlock();
2153
2154 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2155
2156 if (!skb) {
2157 rcu_read_lock();
2158 IP6_INC_STATS(net, __in6_dev_get(dev),
2159 IPSTATS_MIB_OUTDISCARDS);
2160 rcu_read_unlock();
2161 return;
2162 }
2163 skb->priority = TC_PRIO_CONTROL;
2164 skb_reserve(skb, hlen);
2165
2166 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2167 /* <draft-ietf-magma-mld-source-05.txt>:
2168 * use unspecified address as the source address
2169 * when a valid link-local address is not available.
2170 */
2171 saddr = &in6addr_any;
2172 } else
2173 saddr = &addr_buf;
2174
2175 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2176
2177 skb_put_data(skb, ra, sizeof(ra));
2178
2179 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2180 hdr->mld_type = type;
2181 hdr->mld_mca = *addr;
2182
2183 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2184 IPPROTO_ICMPV6,
2185 csum_partial(hdr, len, 0));
2186
2187 rcu_read_lock();
2188 idev = __in6_dev_get(skb->dev);
2189
2190 icmpv6_flow_init(sk, &fl6, type,
2191 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2192 skb->dev->ifindex);
2193 dst = icmp6_dst_alloc(skb->dev, &fl6);
2194 if (IS_ERR(dst)) {
2195 err = PTR_ERR(dst);
2196 goto err_out;
2197 }
2198
2199 skb_dst_set(skb, dst);
2200 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2201 net, sk, skb, NULL, skb->dev,
2202 dst_output);
2203 out:
2204 if (!err) {
2205 ICMP6MSGOUT_INC_STATS(net, idev, type);
2206 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2207 } else
2208 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2209
2210 rcu_read_unlock();
2211 return;
2212
2213 err_out:
2214 kfree_skb(skb);
2215 goto out;
2216 }
2217
2218 /* called with mc_lock */
2219 static void mld_send_initial_cr(struct inet6_dev *idev)
2220 {
2221 struct sk_buff *skb;
2222 struct ifmcaddr6 *pmc;
2223 int type;
2224
2225 if (mld_in_v1_mode(idev))
2226 return;
2227
2228 skb = NULL;
2229 for_each_mc_mclock(idev, pmc) {
2230 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2231 type = MLD2_CHANGE_TO_EXCLUDE;
2232 else
2233 type = MLD2_ALLOW_NEW_SOURCES;
2234 skb = add_grec(skb, pmc, type, 0, 0, 1);
2235 }
2236 if (skb)
2237 mld_sendpack(skb);
2238 }
2239
2240 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2241 {
2242 mutex_lock(&idev->mc_lock);
2243 idev->mc_dad_count = idev->mc_qrv;
2244 if (idev->mc_dad_count) {
2245 mld_send_initial_cr(idev);
2246 idev->mc_dad_count--;
2247 if (idev->mc_dad_count)
2248 mld_dad_start_work(idev,
2249 unsolicited_report_interval(idev));
2250 }
2251 mutex_unlock(&idev->mc_lock);
2252 }
2253
2254 static void mld_dad_work(struct work_struct *work)
2255 {
2256 struct inet6_dev *idev = container_of(to_delayed_work(work),
2257 struct inet6_dev,
2258 mc_dad_work);
2259 mutex_lock(&idev->mc_lock);
2260 mld_send_initial_cr(idev);
2261 if (idev->mc_dad_count) {
2262 idev->mc_dad_count--;
2263 if (idev->mc_dad_count)
2264 mld_dad_start_work(idev,
2265 unsolicited_report_interval(idev));
2266 }
2267 mutex_unlock(&idev->mc_lock);
2268 in6_dev_put(idev);
2269 }
2270
2271 /* called with mc_lock */
2272 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2273 const struct in6_addr *psfsrc)
2274 {
2275 struct ip6_sf_list *psf, *psf_prev;
2276 int rv = 0;
2277
2278 psf_prev = NULL;
2279 for_each_psf_mclock(pmc, psf) {
2280 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2281 break;
2282 psf_prev = psf;
2283 }
2284 if (!psf || psf->sf_count[sfmode] == 0) {
2285 /* source filter not found, or count wrong => bug */
2286 return -ESRCH;
2287 }
2288 psf->sf_count[sfmode]--;
2289 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2290 struct inet6_dev *idev = pmc->idev;
2291
2292 /* no more filters for this source */
2293 if (psf_prev)
2294 rcu_assign_pointer(psf_prev->sf_next,
2295 mc_dereference(psf->sf_next, idev));
2296 else
2297 rcu_assign_pointer(pmc->mca_sources,
2298 mc_dereference(psf->sf_next, idev));
2299
2300 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2301 !mld_in_v1_mode(idev)) {
2302 psf->sf_crcount = idev->mc_qrv;
2303 rcu_assign_pointer(psf->sf_next,
2304 mc_dereference(pmc->mca_tomb, idev));
2305 rcu_assign_pointer(pmc->mca_tomb, psf);
2306 rv = 1;
2307 } else {
2308 kfree_rcu(psf, rcu);
2309 }
2310 }
2311 return rv;
2312 }
2313
2314 /* called with mc_lock */
2315 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2316 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2317 int delta)
2318 {
2319 struct ifmcaddr6 *pmc;
2320 int changerec = 0;
2321 int i, err;
2322
2323 if (!idev)
2324 return -ENODEV;
2325
2326 for_each_mc_mclock(idev, pmc) {
2327 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2328 break;
2329 }
2330 if (!pmc)
2331 return -ESRCH;
2332
2333 sf_markstate(pmc);
2334 if (!delta) {
2335 if (!pmc->mca_sfcount[sfmode])
2336 return -EINVAL;
2337
2338 pmc->mca_sfcount[sfmode]--;
2339 }
2340 err = 0;
2341 for (i = 0; i < sfcount; i++) {
2342 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2343
2344 changerec |= rv > 0;
2345 if (!err && rv < 0)
2346 err = rv;
2347 }
2348 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2349 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2350 pmc->mca_sfcount[MCAST_INCLUDE]) {
2351 struct ip6_sf_list *psf;
2352
2353 /* filter mode change */
2354 pmc->mca_sfmode = MCAST_INCLUDE;
2355 pmc->mca_crcount = idev->mc_qrv;
2356 idev->mc_ifc_count = pmc->mca_crcount;
2357 for_each_psf_mclock(pmc, psf)
2358 psf->sf_crcount = 0;
2359 mld_ifc_event(pmc->idev);
2360 } else if (sf_setstate(pmc) || changerec) {
2361 mld_ifc_event(pmc->idev);
2362 }
2363
2364 return err;
2365 }
2366
2367 /*
2368 * Add multicast single-source filter to the interface list
2369 * called with mc_lock
2370 */
2371 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2372 const struct in6_addr *psfsrc)
2373 {
2374 struct ip6_sf_list *psf, *psf_prev;
2375
2376 psf_prev = NULL;
2377 for_each_psf_mclock(pmc, psf) {
2378 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2379 break;
2380 psf_prev = psf;
2381 }
2382 if (!psf) {
2383 psf = kzalloc(sizeof(*psf), GFP_KERNEL);
2384 if (!psf)
2385 return -ENOBUFS;
2386
2387 psf->sf_addr = *psfsrc;
2388 if (psf_prev) {
2389 rcu_assign_pointer(psf_prev->sf_next, psf);
2390 } else {
2391 rcu_assign_pointer(pmc->mca_sources, psf);
2392 }
2393 }
2394 psf->sf_count[sfmode]++;
2395 return 0;
2396 }
2397
2398 /* called with mc_lock */
2399 static void sf_markstate(struct ifmcaddr6 *pmc)
2400 {
2401 struct ip6_sf_list *psf;
2402 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2403
2404 for_each_psf_mclock(pmc, psf) {
2405 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2406 psf->sf_oldin = mca_xcount ==
2407 psf->sf_count[MCAST_EXCLUDE] &&
2408 !psf->sf_count[MCAST_INCLUDE];
2409 } else {
2410 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2411 }
2412 }
2413 }
2414
2415 /* called with mc_lock */
2416 static int sf_setstate(struct ifmcaddr6 *pmc)
2417 {
2418 struct ip6_sf_list *psf, *dpsf;
2419 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2420 int qrv = pmc->idev->mc_qrv;
2421 int new_in, rv;
2422
2423 rv = 0;
2424 for_each_psf_mclock(pmc, psf) {
2425 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2426 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2427 !psf->sf_count[MCAST_INCLUDE];
2428 } else
2429 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2430 if (new_in) {
2431 if (!psf->sf_oldin) {
2432 struct ip6_sf_list *prev = NULL;
2433
2434 for_each_psf_tomb(pmc, dpsf) {
2435 if (ipv6_addr_equal(&dpsf->sf_addr,
2436 &psf->sf_addr))
2437 break;
2438 prev = dpsf;
2439 }
2440 if (dpsf) {
2441 if (prev)
2442 rcu_assign_pointer(prev->sf_next,
2443 mc_dereference(dpsf->sf_next,
2444 pmc->idev));
2445 else
2446 rcu_assign_pointer(pmc->mca_tomb,
2447 mc_dereference(dpsf->sf_next,
2448 pmc->idev));
2449 kfree_rcu(dpsf, rcu);
2450 }
2451 psf->sf_crcount = qrv;
2452 rv++;
2453 }
2454 } else if (psf->sf_oldin) {
2455 psf->sf_crcount = 0;
2456 /*
2457 * add or update "delete" records if an active filter
2458 * is now inactive
2459 */
2460
2461 for_each_psf_tomb(pmc, dpsf)
2462 if (ipv6_addr_equal(&dpsf->sf_addr,
2463 &psf->sf_addr))
2464 break;
2465 if (!dpsf) {
2466 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL);
2467 if (!dpsf)
2468 continue;
2469 *dpsf = *psf;
2470 rcu_assign_pointer(dpsf->sf_next,
2471 mc_dereference(pmc->mca_tomb, pmc->idev));
2472 rcu_assign_pointer(pmc->mca_tomb, dpsf);
2473 }
2474 dpsf->sf_crcount = qrv;
2475 rv++;
2476 }
2477 }
2478 return rv;
2479 }
2480
2481 /*
2482 * Add multicast source filter list to the interface list
2483 * called with mc_lock
2484 */
2485 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2486 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2487 int delta)
2488 {
2489 struct ifmcaddr6 *pmc;
2490 int isexclude;
2491 int i, err;
2492
2493 if (!idev)
2494 return -ENODEV;
2495
2496 for_each_mc_mclock(idev, pmc) {
2497 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2498 break;
2499 }
2500 if (!pmc)
2501 return -ESRCH;
2502
2503 sf_markstate(pmc);
2504 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2505 if (!delta)
2506 pmc->mca_sfcount[sfmode]++;
2507 err = 0;
2508 for (i = 0; i < sfcount; i++) {
2509 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2510 if (err)
2511 break;
2512 }
2513 if (err) {
2514 int j;
2515
2516 if (!delta)
2517 pmc->mca_sfcount[sfmode]--;
2518 for (j = 0; j < i; j++)
2519 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2520 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2521 struct ip6_sf_list *psf;
2522
2523 /* filter mode change */
2524 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2525 pmc->mca_sfmode = MCAST_EXCLUDE;
2526 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2527 pmc->mca_sfmode = MCAST_INCLUDE;
2528 /* else no filters; keep old mode for reports */
2529
2530 pmc->mca_crcount = idev->mc_qrv;
2531 idev->mc_ifc_count = pmc->mca_crcount;
2532 for_each_psf_mclock(pmc, psf)
2533 psf->sf_crcount = 0;
2534 mld_ifc_event(idev);
2535 } else if (sf_setstate(pmc)) {
2536 mld_ifc_event(idev);
2537 }
2538 return err;
2539 }
2540
2541 /* called with mc_lock */
2542 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2543 {
2544 struct ip6_sf_list *psf, *nextpsf;
2545
2546 for (psf = mc_dereference(pmc->mca_tomb, pmc->idev);
2547 psf;
2548 psf = nextpsf) {
2549 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2550 kfree_rcu(psf, rcu);
2551 }
2552 RCU_INIT_POINTER(pmc->mca_tomb, NULL);
2553 for (psf = mc_dereference(pmc->mca_sources, pmc->idev);
2554 psf;
2555 psf = nextpsf) {
2556 nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2557 kfree_rcu(psf, rcu);
2558 }
2559 RCU_INIT_POINTER(pmc->mca_sources, NULL);
2560 pmc->mca_sfmode = MCAST_EXCLUDE;
2561 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2562 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2563 }
2564
2565 /* called with mc_lock */
2566 static void igmp6_join_group(struct ifmcaddr6 *ma)
2567 {
2568 unsigned long delay;
2569
2570 if (ma->mca_flags & MAF_NOREPORT)
2571 return;
2572
2573 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2574
2575 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2576
2577 if (cancel_delayed_work(&ma->mca_work)) {
2578 refcount_dec(&ma->mca_refcnt);
2579 delay = ma->mca_work.timer.expires - jiffies;
2580 }
2581
2582 if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
2583 refcount_inc(&ma->mca_refcnt);
2584 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2585 }
2586
2587 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2588 struct inet6_dev *idev)
2589 {
2590 struct ip6_sf_socklist *psl;
2591 int err;
2592
2593 psl = sock_dereference(iml->sflist, sk);
2594
2595 if (idev)
2596 mutex_lock(&idev->mc_lock);
2597
2598 if (!psl) {
2599 /* any-source empty exclude case */
2600 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2601 } else {
2602 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2603 psl->sl_count, psl->sl_addr, 0);
2604 RCU_INIT_POINTER(iml->sflist, NULL);
2605 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2606 &sk->sk_omem_alloc);
2607 kfree_rcu(psl, rcu);
2608 }
2609
2610 if (idev)
2611 mutex_unlock(&idev->mc_lock);
2612
2613 return err;
2614 }
2615
2616 /* called with mc_lock */
2617 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2618 {
2619 if (mld_in_v1_mode(ma->idev)) {
2620 if (ma->mca_flags & MAF_LAST_REPORTER) {
2621 igmp6_send(&ma->mca_addr, ma->idev->dev,
2622 ICMPV6_MGM_REDUCTION);
2623 }
2624 } else {
2625 mld_add_delrec(ma->idev, ma);
2626 mld_ifc_event(ma->idev);
2627 }
2628 }
2629
2630 static void mld_gq_work(struct work_struct *work)
2631 {
2632 struct inet6_dev *idev = container_of(to_delayed_work(work),
2633 struct inet6_dev,
2634 mc_gq_work);
2635
2636 mutex_lock(&idev->mc_lock);
2637 mld_send_report(idev, NULL);
2638 idev->mc_gq_running = 0;
2639 mutex_unlock(&idev->mc_lock);
2640
2641 in6_dev_put(idev);
2642 }
2643
2644 static void mld_ifc_work(struct work_struct *work)
2645 {
2646 struct inet6_dev *idev = container_of(to_delayed_work(work),
2647 struct inet6_dev,
2648 mc_ifc_work);
2649
2650 mutex_lock(&idev->mc_lock);
2651 mld_send_cr(idev);
2652
2653 if (idev->mc_ifc_count) {
2654 idev->mc_ifc_count--;
2655 if (idev->mc_ifc_count)
2656 mld_ifc_start_work(idev,
2657 unsolicited_report_interval(idev));
2658 }
2659 mutex_unlock(&idev->mc_lock);
2660 in6_dev_put(idev);
2661 }
2662
2663 /* called with mc_lock */
2664 static void mld_ifc_event(struct inet6_dev *idev)
2665 {
2666 if (mld_in_v1_mode(idev))
2667 return;
2668
2669 idev->mc_ifc_count = idev->mc_qrv;
2670 mld_ifc_start_work(idev, 1);
2671 }
2672
2673 static void mld_mca_work(struct work_struct *work)
2674 {
2675 struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2676 struct ifmcaddr6, mca_work);
2677
2678 mutex_lock(&ma->idev->mc_lock);
2679 if (mld_in_v1_mode(ma->idev))
2680 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2681 else
2682 mld_send_report(ma->idev, ma);
2683 ma->mca_flags |= MAF_LAST_REPORTER;
2684 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2685 mutex_unlock(&ma->idev->mc_lock);
2686
2687 ma_put(ma);
2688 }
2689
2690 /* Device changing type */
2691
2692 void ipv6_mc_unmap(struct inet6_dev *idev)
2693 {
2694 struct ifmcaddr6 *i;
2695
2696 /* Install multicast list, except for all-nodes (already installed) */
2697
2698 mutex_lock(&idev->mc_lock);
2699 for_each_mc_mclock(idev, i)
2700 igmp6_group_dropped(i);
2701 mutex_unlock(&idev->mc_lock);
2702 }
2703
2704 void ipv6_mc_remap(struct inet6_dev *idev)
2705 {
2706 ipv6_mc_up(idev);
2707 }
2708
2709 /* Device going down */
2710 void ipv6_mc_down(struct inet6_dev *idev)
2711 {
2712 struct ifmcaddr6 *i;
2713
2714 mutex_lock(&idev->mc_lock);
2715 /* Withdraw multicast list */
2716 for_each_mc_mclock(idev, i)
2717 igmp6_group_dropped(i);
2718 mutex_unlock(&idev->mc_lock);
2719
2720 /* Should stop work after group drop. or we will
2721 * start work again in mld_ifc_event()
2722 */
2723 synchronize_net();
2724 mld_query_stop_work(idev);
2725 mld_report_stop_work(idev);
2726 mld_ifc_stop_work(idev);
2727 mld_gq_stop_work(idev);
2728 mld_dad_stop_work(idev);
2729 }
2730
2731 static void ipv6_mc_reset(struct inet6_dev *idev)
2732 {
2733 idev->mc_qrv = sysctl_mld_qrv;
2734 idev->mc_qi = MLD_QI_DEFAULT;
2735 idev->mc_qri = MLD_QRI_DEFAULT;
2736 idev->mc_v1_seen = 0;
2737 idev->mc_maxdelay = unsolicited_report_interval(idev);
2738 }
2739
2740 /* Device going up */
2741
2742 void ipv6_mc_up(struct inet6_dev *idev)
2743 {
2744 struct ifmcaddr6 *i;
2745
2746 /* Install multicast list, except for all-nodes (already installed) */
2747
2748 ipv6_mc_reset(idev);
2749 mutex_lock(&idev->mc_lock);
2750 for_each_mc_mclock(idev, i) {
2751 mld_del_delrec(idev, i);
2752 igmp6_group_added(i);
2753 }
2754 mutex_unlock(&idev->mc_lock);
2755 }
2756
2757 /* IPv6 device initialization. */
2758
2759 void ipv6_mc_init_dev(struct inet6_dev *idev)
2760 {
2761 idev->mc_gq_running = 0;
2762 INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work);
2763 RCU_INIT_POINTER(idev->mc_tomb, NULL);
2764 idev->mc_ifc_count = 0;
2765 INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work);
2766 INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work);
2767 INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work);
2768 INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work);
2769 skb_queue_head_init(&idev->mc_query_queue);
2770 skb_queue_head_init(&idev->mc_report_queue);
2771 spin_lock_init(&idev->mc_query_lock);
2772 spin_lock_init(&idev->mc_report_lock);
2773 mutex_init(&idev->mc_lock);
2774 ipv6_mc_reset(idev);
2775 }
2776
2777 /*
2778 * Device is about to be destroyed: clean up.
2779 */
2780
2781 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2782 {
2783 struct ifmcaddr6 *i;
2784
2785 /* Deactivate works */
2786 ipv6_mc_down(idev);
2787 mutex_lock(&idev->mc_lock);
2788 mld_clear_delrec(idev);
2789 mutex_unlock(&idev->mc_lock);
2790 mld_clear_query(idev);
2791 mld_clear_report(idev);
2792
2793 /* Delete all-nodes address. */
2794 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2795 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2796 * fail.
2797 */
2798 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2799
2800 if (idev->cnf.forwarding)
2801 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2802
2803 mutex_lock(&idev->mc_lock);
2804 while ((i = mc_dereference(idev->mc_list, idev))) {
2805 rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev));
2806
2807 ip6_mc_clear_src(i);
2808 ma_put(i);
2809 }
2810 mutex_unlock(&idev->mc_lock);
2811 }
2812
2813 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2814 {
2815 struct ifmcaddr6 *pmc;
2816
2817 ASSERT_RTNL();
2818
2819 mutex_lock(&idev->mc_lock);
2820 if (mld_in_v1_mode(idev)) {
2821 for_each_mc_mclock(idev, pmc)
2822 igmp6_join_group(pmc);
2823 } else {
2824 mld_send_report(idev, NULL);
2825 }
2826 mutex_unlock(&idev->mc_lock);
2827 }
2828
2829 static int ipv6_mc_netdev_event(struct notifier_block *this,
2830 unsigned long event,
2831 void *ptr)
2832 {
2833 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2834 struct inet6_dev *idev = __in6_dev_get(dev);
2835
2836 switch (event) {
2837 case NETDEV_RESEND_IGMP:
2838 if (idev)
2839 ipv6_mc_rejoin_groups(idev);
2840 break;
2841 default:
2842 break;
2843 }
2844
2845 return NOTIFY_DONE;
2846 }
2847
2848 static struct notifier_block igmp6_netdev_notifier = {
2849 .notifier_call = ipv6_mc_netdev_event,
2850 };
2851
2852 #ifdef CONFIG_PROC_FS
2853 struct igmp6_mc_iter_state {
2854 struct seq_net_private p;
2855 struct net_device *dev;
2856 struct inet6_dev *idev;
2857 };
2858
2859 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2860
2861 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2862 {
2863 struct ifmcaddr6 *im = NULL;
2864 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2865 struct net *net = seq_file_net(seq);
2866
2867 state->idev = NULL;
2868 for_each_netdev_rcu(net, state->dev) {
2869 struct inet6_dev *idev;
2870 idev = __in6_dev_get(state->dev);
2871 if (!idev)
2872 continue;
2873
2874 im = rcu_dereference(idev->mc_list);
2875 if (im) {
2876 state->idev = idev;
2877 break;
2878 }
2879 }
2880 return im;
2881 }
2882
2883 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2884 {
2885 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2886
2887 im = rcu_dereference(im->next);
2888 while (!im) {
2889 state->dev = next_net_device_rcu(state->dev);
2890 if (!state->dev) {
2891 state->idev = NULL;
2892 break;
2893 }
2894 state->idev = __in6_dev_get(state->dev);
2895 if (!state->idev)
2896 continue;
2897 im = rcu_dereference(state->idev->mc_list);
2898 }
2899 return im;
2900 }
2901
2902 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2903 {
2904 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2905 if (im)
2906 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2907 --pos;
2908 return pos ? NULL : im;
2909 }
2910
2911 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2912 __acquires(RCU)
2913 {
2914 rcu_read_lock();
2915 return igmp6_mc_get_idx(seq, *pos);
2916 }
2917
2918 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2919 {
2920 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2921
2922 ++*pos;
2923 return im;
2924 }
2925
2926 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2927 __releases(RCU)
2928 {
2929 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2930
2931 if (likely(state->idev))
2932 state->idev = NULL;
2933 state->dev = NULL;
2934 rcu_read_unlock();
2935 }
2936
2937 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2938 {
2939 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2940 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2941
2942 seq_printf(seq,
2943 "%-4d %-15s %pi6 %5d %08X %ld\n",
2944 state->dev->ifindex, state->dev->name,
2945 &im->mca_addr,
2946 im->mca_users, im->mca_flags,
2947 (im->mca_flags & MAF_TIMER_RUNNING) ?
2948 jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0);
2949 return 0;
2950 }
2951
2952 static const struct seq_operations igmp6_mc_seq_ops = {
2953 .start = igmp6_mc_seq_start,
2954 .next = igmp6_mc_seq_next,
2955 .stop = igmp6_mc_seq_stop,
2956 .show = igmp6_mc_seq_show,
2957 };
2958
2959 struct igmp6_mcf_iter_state {
2960 struct seq_net_private p;
2961 struct net_device *dev;
2962 struct inet6_dev *idev;
2963 struct ifmcaddr6 *im;
2964 };
2965
2966 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2967
2968 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2969 {
2970 struct ip6_sf_list *psf = NULL;
2971 struct ifmcaddr6 *im = NULL;
2972 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2973 struct net *net = seq_file_net(seq);
2974
2975 state->idev = NULL;
2976 state->im = NULL;
2977 for_each_netdev_rcu(net, state->dev) {
2978 struct inet6_dev *idev;
2979 idev = __in6_dev_get(state->dev);
2980 if (unlikely(idev == NULL))
2981 continue;
2982
2983 im = rcu_dereference(idev->mc_list);
2984 if (likely(im)) {
2985 psf = rcu_dereference(im->mca_sources);
2986 if (likely(psf)) {
2987 state->im = im;
2988 state->idev = idev;
2989 break;
2990 }
2991 }
2992 }
2993 return psf;
2994 }
2995
2996 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2997 {
2998 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2999
3000 psf = rcu_dereference(psf->sf_next);
3001 while (!psf) {
3002 state->im = rcu_dereference(state->im->next);
3003 while (!state->im) {
3004 state->dev = next_net_device_rcu(state->dev);
3005 if (!state->dev) {
3006 state->idev = NULL;
3007 goto out;
3008 }
3009 state->idev = __in6_dev_get(state->dev);
3010 if (!state->idev)
3011 continue;
3012 state->im = rcu_dereference(state->idev->mc_list);
3013 }
3014 if (!state->im)
3015 break;
3016 psf = rcu_dereference(state->im->mca_sources);
3017 }
3018 out:
3019 return psf;
3020 }
3021
3022 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3023 {
3024 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3025 if (psf)
3026 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3027 --pos;
3028 return pos ? NULL : psf;
3029 }
3030
3031 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3032 __acquires(RCU)
3033 {
3034 rcu_read_lock();
3035 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3036 }
3037
3038 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3039 {
3040 struct ip6_sf_list *psf;
3041 if (v == SEQ_START_TOKEN)
3042 psf = igmp6_mcf_get_first(seq);
3043 else
3044 psf = igmp6_mcf_get_next(seq, v);
3045 ++*pos;
3046 return psf;
3047 }
3048
3049 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
3050 __releases(RCU)
3051 {
3052 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3053
3054 if (likely(state->im))
3055 state->im = NULL;
3056 if (likely(state->idev))
3057 state->idev = NULL;
3058
3059 state->dev = NULL;
3060 rcu_read_unlock();
3061 }
3062
3063 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3064 {
3065 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3066 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3067
3068 if (v == SEQ_START_TOKEN) {
3069 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
3070 } else {
3071 seq_printf(seq,
3072 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
3073 state->dev->ifindex, state->dev->name,
3074 &state->im->mca_addr,
3075 &psf->sf_addr,
3076 psf->sf_count[MCAST_INCLUDE],
3077 psf->sf_count[MCAST_EXCLUDE]);
3078 }
3079 return 0;
3080 }
3081
3082 static const struct seq_operations igmp6_mcf_seq_ops = {
3083 .start = igmp6_mcf_seq_start,
3084 .next = igmp6_mcf_seq_next,
3085 .stop = igmp6_mcf_seq_stop,
3086 .show = igmp6_mcf_seq_show,
3087 };
3088
3089 static int __net_init igmp6_proc_init(struct net *net)
3090 {
3091 int err;
3092
3093 err = -ENOMEM;
3094 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3095 sizeof(struct igmp6_mc_iter_state)))
3096 goto out;
3097 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3098 &igmp6_mcf_seq_ops,
3099 sizeof(struct igmp6_mcf_iter_state)))
3100 goto out_proc_net_igmp6;
3101
3102 err = 0;
3103 out:
3104 return err;
3105
3106 out_proc_net_igmp6:
3107 remove_proc_entry("igmp6", net->proc_net);
3108 goto out;
3109 }
3110
3111 static void __net_exit igmp6_proc_exit(struct net *net)
3112 {
3113 remove_proc_entry("mcfilter6", net->proc_net);
3114 remove_proc_entry("igmp6", net->proc_net);
3115 }
3116 #else
3117 static inline int igmp6_proc_init(struct net *net)
3118 {
3119 return 0;
3120 }
3121 static inline void igmp6_proc_exit(struct net *net)
3122 {
3123 }
3124 #endif
3125
3126 static int __net_init igmp6_net_init(struct net *net)
3127 {
3128 int err;
3129
3130 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3131 SOCK_RAW, IPPROTO_ICMPV6, net);
3132 if (err < 0) {
3133 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
3134 err);
3135 goto out;
3136 }
3137
3138 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
3139 net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
3140
3141 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3142 SOCK_RAW, IPPROTO_ICMPV6, net);
3143 if (err < 0) {
3144 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3145 err);
3146 goto out_sock_create;
3147 }
3148
3149 err = igmp6_proc_init(net);
3150 if (err)
3151 goto out_sock_create_autojoin;
3152
3153 return 0;
3154
3155 out_sock_create_autojoin:
3156 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3157 out_sock_create:
3158 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3159 out:
3160 return err;
3161 }
3162
3163 static void __net_exit igmp6_net_exit(struct net *net)
3164 {
3165 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3166 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3167 igmp6_proc_exit(net);
3168 }
3169
3170 static struct pernet_operations igmp6_net_ops = {
3171 .init = igmp6_net_init,
3172 .exit = igmp6_net_exit,
3173 };
3174
3175 int __init igmp6_init(void)
3176 {
3177 int err;
3178
3179 err = register_pernet_subsys(&igmp6_net_ops);
3180 if (err)
3181 return err;
3182
3183 mld_wq = create_workqueue("mld");
3184 if (!mld_wq) {
3185 unregister_pernet_subsys(&igmp6_net_ops);
3186 return -ENOMEM;
3187 }
3188
3189 return err;
3190 }
3191
3192 int __init igmp6_late_init(void)
3193 {
3194 return register_netdevice_notifier(&igmp6_netdev_notifier);
3195 }
3196
3197 void igmp6_cleanup(void)
3198 {
3199 unregister_pernet_subsys(&igmp6_net_ops);
3200 destroy_workqueue(mld_wq);
3201 }
3202
3203 void igmp6_late_cleanup(void)
3204 {
3205 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3206 }
Michael's Linux tree.