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Merge tag 'usb-3.19-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[deliverable/linux.git] / net / ipv6 / mcast.c
1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <linux/pkt_sched.h>
48 #include <net/mld.h>
49
50 #include <linux/netfilter.h>
51 #include <linux/netfilter_ipv6.h>
52
53 #include <net/net_namespace.h>
54 #include <net/sock.h>
55 #include <net/snmp.h>
56
57 #include <net/ipv6.h>
58 #include <net/protocol.h>
59 #include <net/if_inet6.h>
60 #include <net/ndisc.h>
61 #include <net/addrconf.h>
62 #include <net/ip6_route.h>
63 #include <net/inet_common.h>
64
65 #include <net/ip6_checksum.h>
66
67 /* Ensure that we have struct in6_addr aligned on 32bit word. */
68 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
69 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
70 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
71 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
72 };
73
74 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
75
76 static void igmp6_join_group(struct ifmcaddr6 *ma);
77 static void igmp6_leave_group(struct ifmcaddr6 *ma);
78 static void igmp6_timer_handler(unsigned long data);
79
80 static void mld_gq_timer_expire(unsigned long data);
81 static void mld_ifc_timer_expire(unsigned long data);
82 static void mld_ifc_event(struct inet6_dev *idev);
83 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
84 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
85 static void mld_clear_delrec(struct inet6_dev *idev);
86 static bool mld_in_v1_mode(const struct inet6_dev *idev);
87 static int sf_setstate(struct ifmcaddr6 *pmc);
88 static void sf_markstate(struct ifmcaddr6 *pmc);
89 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
90 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
91 int sfmode, int sfcount, const struct in6_addr *psfsrc,
92 int delta);
93 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
94 int sfmode, int sfcount, const struct in6_addr *psfsrc,
95 int delta);
96 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
97 struct inet6_dev *idev);
98
99 #define MLD_QRV_DEFAULT 2
100 /* RFC3810, 9.2. Query Interval */
101 #define MLD_QI_DEFAULT (125 * HZ)
102 /* RFC3810, 9.3. Query Response Interval */
103 #define MLD_QRI_DEFAULT (10 * HZ)
104
105 /* RFC3810, 8.1 Query Version Distinctions */
106 #define MLD_V1_QUERY_LEN 24
107 #define MLD_V2_QUERY_LEN_MIN 28
108
109 #define IPV6_MLD_MAX_MSF 64
110
111 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
112 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
113
114 /*
115 * socket join on multicast group
116 */
117
118 #define for_each_pmc_rcu(np, pmc) \
119 for (pmc = rcu_dereference(np->ipv6_mc_list); \
120 pmc != NULL; \
121 pmc = rcu_dereference(pmc->next))
122
123 static int unsolicited_report_interval(struct inet6_dev *idev)
124 {
125 int iv;
126
127 if (mld_in_v1_mode(idev))
128 iv = idev->cnf.mldv1_unsolicited_report_interval;
129 else
130 iv = idev->cnf.mldv2_unsolicited_report_interval;
131
132 return iv > 0 ? iv : 1;
133 }
134
135 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
136 {
137 struct net_device *dev = NULL;
138 struct ipv6_mc_socklist *mc_lst;
139 struct ipv6_pinfo *np = inet6_sk(sk);
140 struct net *net = sock_net(sk);
141 int err;
142
143 if (!ipv6_addr_is_multicast(addr))
144 return -EINVAL;
145
146 rcu_read_lock();
147 for_each_pmc_rcu(np, mc_lst) {
148 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
149 ipv6_addr_equal(&mc_lst->addr, addr)) {
150 rcu_read_unlock();
151 return -EADDRINUSE;
152 }
153 }
154 rcu_read_unlock();
155
156 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
157
158 if (mc_lst == NULL)
159 return -ENOMEM;
160
161 mc_lst->next = NULL;
162 mc_lst->addr = *addr;
163
164 rtnl_lock();
165 if (ifindex == 0) {
166 struct rt6_info *rt;
167 rt = rt6_lookup(net, addr, NULL, 0, 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 == NULL) {
176 rtnl_unlock();
177 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
178 return -ENODEV;
179 }
180
181 mc_lst->ifindex = dev->ifindex;
182 mc_lst->sfmode = MCAST_EXCLUDE;
183 rwlock_init(&mc_lst->sflock);
184 mc_lst->sflist = NULL;
185
186 /*
187 * now add/increase the group membership on the device
188 */
189
190 err = ipv6_dev_mc_inc(dev, addr);
191
192 if (err) {
193 rtnl_unlock();
194 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
195 return err;
196 }
197
198 mc_lst->next = np->ipv6_mc_list;
199 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
200
201 rtnl_unlock();
202
203 return 0;
204 }
205
206 /*
207 * socket leave on multicast group
208 */
209 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
210 {
211 struct ipv6_pinfo *np = inet6_sk(sk);
212 struct ipv6_mc_socklist *mc_lst;
213 struct ipv6_mc_socklist __rcu **lnk;
214 struct net *net = sock_net(sk);
215
216 if (!ipv6_addr_is_multicast(addr))
217 return -EINVAL;
218
219 rtnl_lock();
220 for (lnk = &np->ipv6_mc_list;
221 (mc_lst = rtnl_dereference(*lnk)) != NULL;
222 lnk = &mc_lst->next) {
223 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
224 ipv6_addr_equal(&mc_lst->addr, addr)) {
225 struct net_device *dev;
226
227 *lnk = mc_lst->next;
228
229 dev = __dev_get_by_index(net, mc_lst->ifindex);
230 if (dev != NULL) {
231 struct inet6_dev *idev = __in6_dev_get(dev);
232
233 (void) ip6_mc_leave_src(sk, mc_lst, idev);
234 if (idev)
235 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
236 } else
237 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
238 rtnl_unlock();
239
240 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
241 kfree_rcu(mc_lst, rcu);
242 return 0;
243 }
244 }
245 rtnl_unlock();
246
247 return -EADDRNOTAVAIL;
248 }
249
250 /* called with rcu_read_lock() */
251 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
252 const struct in6_addr *group,
253 int ifindex)
254 {
255 struct net_device *dev = NULL;
256 struct inet6_dev *idev = NULL;
257
258 if (ifindex == 0) {
259 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
260
261 if (rt) {
262 dev = rt->dst.dev;
263 ip6_rt_put(rt);
264 }
265 } else
266 dev = dev_get_by_index_rcu(net, ifindex);
267
268 if (!dev)
269 return NULL;
270 idev = __in6_dev_get(dev);
271 if (!idev)
272 return NULL;
273 read_lock_bh(&idev->lock);
274 if (idev->dead) {
275 read_unlock_bh(&idev->lock);
276 return NULL;
277 }
278 return idev;
279 }
280
281 void ipv6_sock_mc_close(struct sock *sk)
282 {
283 struct ipv6_pinfo *np = inet6_sk(sk);
284 struct ipv6_mc_socklist *mc_lst;
285 struct net *net = sock_net(sk);
286
287 if (!rcu_access_pointer(np->ipv6_mc_list))
288 return;
289
290 rtnl_lock();
291 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
292 struct net_device *dev;
293
294 np->ipv6_mc_list = mc_lst->next;
295
296 dev = __dev_get_by_index(net, mc_lst->ifindex);
297 if (dev) {
298 struct inet6_dev *idev = __in6_dev_get(dev);
299
300 (void) ip6_mc_leave_src(sk, mc_lst, idev);
301 if (idev)
302 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
303 } else
304 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
305
306 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
307 kfree_rcu(mc_lst, rcu);
308
309 }
310 rtnl_unlock();
311 }
312
313 int ip6_mc_source(int add, int omode, struct sock *sk,
314 struct group_source_req *pgsr)
315 {
316 struct in6_addr *source, *group;
317 struct ipv6_mc_socklist *pmc;
318 struct inet6_dev *idev;
319 struct ipv6_pinfo *inet6 = inet6_sk(sk);
320 struct ip6_sf_socklist *psl;
321 struct net *net = sock_net(sk);
322 int i, j, rv;
323 int leavegroup = 0;
324 int pmclocked = 0;
325 int err;
326
327 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
328 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
329
330 if (!ipv6_addr_is_multicast(group))
331 return -EINVAL;
332
333 rcu_read_lock();
334 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
335 if (!idev) {
336 rcu_read_unlock();
337 return -ENODEV;
338 }
339
340 err = -EADDRNOTAVAIL;
341
342 for_each_pmc_rcu(inet6, pmc) {
343 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
344 continue;
345 if (ipv6_addr_equal(&pmc->addr, group))
346 break;
347 }
348 if (!pmc) { /* must have a prior join */
349 err = -EINVAL;
350 goto done;
351 }
352 /* if a source filter was set, must be the same mode as before */
353 if (pmc->sflist) {
354 if (pmc->sfmode != omode) {
355 err = -EINVAL;
356 goto done;
357 }
358 } else if (pmc->sfmode != omode) {
359 /* allow mode switches for empty-set filters */
360 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
361 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
362 pmc->sfmode = omode;
363 }
364
365 write_lock(&pmc->sflock);
366 pmclocked = 1;
367
368 psl = pmc->sflist;
369 if (!add) {
370 if (!psl)
371 goto done; /* err = -EADDRNOTAVAIL */
372 rv = !0;
373 for (i = 0; i < psl->sl_count; i++) {
374 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
375 if (rv == 0)
376 break;
377 }
378 if (rv) /* source not found */
379 goto done; /* err = -EADDRNOTAVAIL */
380
381 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
382 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
383 leavegroup = 1;
384 goto done;
385 }
386
387 /* update the interface filter */
388 ip6_mc_del_src(idev, group, omode, 1, source, 1);
389
390 for (j = i+1; j < psl->sl_count; j++)
391 psl->sl_addr[j-1] = psl->sl_addr[j];
392 psl->sl_count--;
393 err = 0;
394 goto done;
395 }
396 /* else, add a new source to the filter */
397
398 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
399 err = -ENOBUFS;
400 goto done;
401 }
402 if (!psl || psl->sl_count == psl->sl_max) {
403 struct ip6_sf_socklist *newpsl;
404 int count = IP6_SFBLOCK;
405
406 if (psl)
407 count += psl->sl_max;
408 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
409 if (!newpsl) {
410 err = -ENOBUFS;
411 goto done;
412 }
413 newpsl->sl_max = count;
414 newpsl->sl_count = count - IP6_SFBLOCK;
415 if (psl) {
416 for (i = 0; i < psl->sl_count; i++)
417 newpsl->sl_addr[i] = psl->sl_addr[i];
418 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
419 }
420 pmc->sflist = psl = newpsl;
421 }
422 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
423 for (i = 0; i < psl->sl_count; i++) {
424 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
425 if (rv == 0) /* There is an error in the address. */
426 goto done;
427 }
428 for (j = psl->sl_count-1; j >= i; j--)
429 psl->sl_addr[j+1] = psl->sl_addr[j];
430 psl->sl_addr[i] = *source;
431 psl->sl_count++;
432 err = 0;
433 /* update the interface list */
434 ip6_mc_add_src(idev, group, omode, 1, source, 1);
435 done:
436 if (pmclocked)
437 write_unlock(&pmc->sflock);
438 read_unlock_bh(&idev->lock);
439 rcu_read_unlock();
440 if (leavegroup)
441 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
442 return err;
443 }
444
445 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
446 {
447 const struct in6_addr *group;
448 struct ipv6_mc_socklist *pmc;
449 struct inet6_dev *idev;
450 struct ipv6_pinfo *inet6 = inet6_sk(sk);
451 struct ip6_sf_socklist *newpsl, *psl;
452 struct net *net = sock_net(sk);
453 int leavegroup = 0;
454 int i, err;
455
456 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
457
458 if (!ipv6_addr_is_multicast(group))
459 return -EINVAL;
460 if (gsf->gf_fmode != MCAST_INCLUDE &&
461 gsf->gf_fmode != MCAST_EXCLUDE)
462 return -EINVAL;
463
464 rcu_read_lock();
465 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
466
467 if (!idev) {
468 rcu_read_unlock();
469 return -ENODEV;
470 }
471
472 err = 0;
473
474 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
475 leavegroup = 1;
476 goto done;
477 }
478
479 for_each_pmc_rcu(inet6, pmc) {
480 if (pmc->ifindex != gsf->gf_interface)
481 continue;
482 if (ipv6_addr_equal(&pmc->addr, group))
483 break;
484 }
485 if (!pmc) { /* must have a prior join */
486 err = -EINVAL;
487 goto done;
488 }
489 if (gsf->gf_numsrc) {
490 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
491 GFP_ATOMIC);
492 if (!newpsl) {
493 err = -ENOBUFS;
494 goto done;
495 }
496 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
497 for (i = 0; i < newpsl->sl_count; ++i) {
498 struct sockaddr_in6 *psin6;
499
500 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
501 newpsl->sl_addr[i] = psin6->sin6_addr;
502 }
503 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
504 newpsl->sl_count, newpsl->sl_addr, 0);
505 if (err) {
506 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
507 goto done;
508 }
509 } else {
510 newpsl = NULL;
511 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
512 }
513
514 write_lock(&pmc->sflock);
515 psl = pmc->sflist;
516 if (psl) {
517 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
518 psl->sl_count, psl->sl_addr, 0);
519 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
520 } else
521 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
522 pmc->sflist = newpsl;
523 pmc->sfmode = gsf->gf_fmode;
524 write_unlock(&pmc->sflock);
525 err = 0;
526 done:
527 read_unlock_bh(&idev->lock);
528 rcu_read_unlock();
529 if (leavegroup)
530 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
531 return err;
532 }
533
534 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
535 struct group_filter __user *optval, int __user *optlen)
536 {
537 int err, i, count, copycount;
538 const struct in6_addr *group;
539 struct ipv6_mc_socklist *pmc;
540 struct inet6_dev *idev;
541 struct ipv6_pinfo *inet6 = inet6_sk(sk);
542 struct ip6_sf_socklist *psl;
543 struct net *net = sock_net(sk);
544
545 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
546
547 if (!ipv6_addr_is_multicast(group))
548 return -EINVAL;
549
550 rcu_read_lock();
551 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
552
553 if (!idev) {
554 rcu_read_unlock();
555 return -ENODEV;
556 }
557
558 err = -EADDRNOTAVAIL;
559 /* changes to the ipv6_mc_list require the socket lock and
560 * rtnl lock. We have the socket lock and rcu read lock,
561 * so reading the list is safe.
562 */
563
564 for_each_pmc_rcu(inet6, pmc) {
565 if (pmc->ifindex != gsf->gf_interface)
566 continue;
567 if (ipv6_addr_equal(group, &pmc->addr))
568 break;
569 }
570 if (!pmc) /* must have a prior join */
571 goto done;
572 gsf->gf_fmode = pmc->sfmode;
573 psl = pmc->sflist;
574 count = psl ? psl->sl_count : 0;
575 read_unlock_bh(&idev->lock);
576 rcu_read_unlock();
577
578 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
579 gsf->gf_numsrc = count;
580 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
581 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
582 return -EFAULT;
583 }
584 /* changes to psl require the socket lock, and a write lock
585 * on pmc->sflock. We have the socket lock so reading here is safe.
586 */
587 for (i = 0; i < copycount; i++) {
588 struct sockaddr_in6 *psin6;
589 struct sockaddr_storage ss;
590
591 psin6 = (struct sockaddr_in6 *)&ss;
592 memset(&ss, 0, sizeof(ss));
593 psin6->sin6_family = AF_INET6;
594 psin6->sin6_addr = psl->sl_addr[i];
595 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
596 return -EFAULT;
597 }
598 return 0;
599 done:
600 read_unlock_bh(&idev->lock);
601 rcu_read_unlock();
602 return err;
603 }
604
605 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
606 const struct in6_addr *src_addr)
607 {
608 struct ipv6_pinfo *np = inet6_sk(sk);
609 struct ipv6_mc_socklist *mc;
610 struct ip6_sf_socklist *psl;
611 bool rv = true;
612
613 rcu_read_lock();
614 for_each_pmc_rcu(np, mc) {
615 if (ipv6_addr_equal(&mc->addr, mc_addr))
616 break;
617 }
618 if (!mc) {
619 rcu_read_unlock();
620 return true;
621 }
622 read_lock(&mc->sflock);
623 psl = mc->sflist;
624 if (!psl) {
625 rv = mc->sfmode == MCAST_EXCLUDE;
626 } else {
627 int i;
628
629 for (i = 0; i < psl->sl_count; i++) {
630 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
631 break;
632 }
633 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
634 rv = false;
635 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
636 rv = false;
637 }
638 read_unlock(&mc->sflock);
639 rcu_read_unlock();
640
641 return rv;
642 }
643
644 static void igmp6_group_added(struct ifmcaddr6 *mc)
645 {
646 struct net_device *dev = mc->idev->dev;
647 char buf[MAX_ADDR_LEN];
648
649 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
650 IPV6_ADDR_SCOPE_LINKLOCAL)
651 return;
652
653 spin_lock_bh(&mc->mca_lock);
654 if (!(mc->mca_flags&MAF_LOADED)) {
655 mc->mca_flags |= MAF_LOADED;
656 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
657 dev_mc_add(dev, buf);
658 }
659 spin_unlock_bh(&mc->mca_lock);
660
661 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
662 return;
663
664 if (mld_in_v1_mode(mc->idev)) {
665 igmp6_join_group(mc);
666 return;
667 }
668 /* else v2 */
669
670 mc->mca_crcount = mc->idev->mc_qrv;
671 mld_ifc_event(mc->idev);
672 }
673
674 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
675 {
676 struct net_device *dev = mc->idev->dev;
677 char buf[MAX_ADDR_LEN];
678
679 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
680 IPV6_ADDR_SCOPE_LINKLOCAL)
681 return;
682
683 spin_lock_bh(&mc->mca_lock);
684 if (mc->mca_flags&MAF_LOADED) {
685 mc->mca_flags &= ~MAF_LOADED;
686 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
687 dev_mc_del(dev, buf);
688 }
689
690 if (mc->mca_flags & MAF_NOREPORT)
691 goto done;
692 spin_unlock_bh(&mc->mca_lock);
693
694 if (!mc->idev->dead)
695 igmp6_leave_group(mc);
696
697 spin_lock_bh(&mc->mca_lock);
698 if (del_timer(&mc->mca_timer))
699 atomic_dec(&mc->mca_refcnt);
700 done:
701 ip6_mc_clear_src(mc);
702 spin_unlock_bh(&mc->mca_lock);
703 }
704
705 /*
706 * deleted ifmcaddr6 manipulation
707 */
708 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
709 {
710 struct ifmcaddr6 *pmc;
711
712 /* this is an "ifmcaddr6" for convenience; only the fields below
713 * are actually used. In particular, the refcnt and users are not
714 * used for management of the delete list. Using the same structure
715 * for deleted items allows change reports to use common code with
716 * non-deleted or query-response MCA's.
717 */
718 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
719 if (!pmc)
720 return;
721
722 spin_lock_bh(&im->mca_lock);
723 spin_lock_init(&pmc->mca_lock);
724 pmc->idev = im->idev;
725 in6_dev_hold(idev);
726 pmc->mca_addr = im->mca_addr;
727 pmc->mca_crcount = idev->mc_qrv;
728 pmc->mca_sfmode = im->mca_sfmode;
729 if (pmc->mca_sfmode == MCAST_INCLUDE) {
730 struct ip6_sf_list *psf;
731
732 pmc->mca_tomb = im->mca_tomb;
733 pmc->mca_sources = im->mca_sources;
734 im->mca_tomb = im->mca_sources = NULL;
735 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
736 psf->sf_crcount = pmc->mca_crcount;
737 }
738 spin_unlock_bh(&im->mca_lock);
739
740 spin_lock_bh(&idev->mc_lock);
741 pmc->next = idev->mc_tomb;
742 idev->mc_tomb = pmc;
743 spin_unlock_bh(&idev->mc_lock);
744 }
745
746 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
747 {
748 struct ifmcaddr6 *pmc, *pmc_prev;
749 struct ip6_sf_list *psf, *psf_next;
750
751 spin_lock_bh(&idev->mc_lock);
752 pmc_prev = NULL;
753 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
754 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
755 break;
756 pmc_prev = pmc;
757 }
758 if (pmc) {
759 if (pmc_prev)
760 pmc_prev->next = pmc->next;
761 else
762 idev->mc_tomb = pmc->next;
763 }
764 spin_unlock_bh(&idev->mc_lock);
765
766 if (pmc) {
767 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
768 psf_next = psf->sf_next;
769 kfree(psf);
770 }
771 in6_dev_put(pmc->idev);
772 kfree(pmc);
773 }
774 }
775
776 static void mld_clear_delrec(struct inet6_dev *idev)
777 {
778 struct ifmcaddr6 *pmc, *nextpmc;
779
780 spin_lock_bh(&idev->mc_lock);
781 pmc = idev->mc_tomb;
782 idev->mc_tomb = NULL;
783 spin_unlock_bh(&idev->mc_lock);
784
785 for (; pmc; pmc = nextpmc) {
786 nextpmc = pmc->next;
787 ip6_mc_clear_src(pmc);
788 in6_dev_put(pmc->idev);
789 kfree(pmc);
790 }
791
792 /* clear dead sources, too */
793 read_lock_bh(&idev->lock);
794 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
795 struct ip6_sf_list *psf, *psf_next;
796
797 spin_lock_bh(&pmc->mca_lock);
798 psf = pmc->mca_tomb;
799 pmc->mca_tomb = NULL;
800 spin_unlock_bh(&pmc->mca_lock);
801 for (; psf; psf = psf_next) {
802 psf_next = psf->sf_next;
803 kfree(psf);
804 }
805 }
806 read_unlock_bh(&idev->lock);
807 }
808
809 static void mca_get(struct ifmcaddr6 *mc)
810 {
811 atomic_inc(&mc->mca_refcnt);
812 }
813
814 static void ma_put(struct ifmcaddr6 *mc)
815 {
816 if (atomic_dec_and_test(&mc->mca_refcnt)) {
817 in6_dev_put(mc->idev);
818 kfree(mc);
819 }
820 }
821
822 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
823 const struct in6_addr *addr)
824 {
825 struct ifmcaddr6 *mc;
826
827 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
828 if (mc == NULL)
829 return NULL;
830
831 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
832
833 mc->mca_addr = *addr;
834 mc->idev = idev; /* reference taken by caller */
835 mc->mca_users = 1;
836 /* mca_stamp should be updated upon changes */
837 mc->mca_cstamp = mc->mca_tstamp = jiffies;
838 atomic_set(&mc->mca_refcnt, 1);
839 spin_lock_init(&mc->mca_lock);
840
841 /* initial mode is (EX, empty) */
842 mc->mca_sfmode = MCAST_EXCLUDE;
843 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
844
845 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
846 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
847 mc->mca_flags |= MAF_NOREPORT;
848
849 return mc;
850 }
851
852 /*
853 * device multicast group inc (add if not found)
854 */
855 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
856 {
857 struct ifmcaddr6 *mc;
858 struct inet6_dev *idev;
859
860 ASSERT_RTNL();
861
862 /* we need to take a reference on idev */
863 idev = in6_dev_get(dev);
864
865 if (idev == NULL)
866 return -EINVAL;
867
868 write_lock_bh(&idev->lock);
869 if (idev->dead) {
870 write_unlock_bh(&idev->lock);
871 in6_dev_put(idev);
872 return -ENODEV;
873 }
874
875 for (mc = idev->mc_list; mc; mc = mc->next) {
876 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
877 mc->mca_users++;
878 write_unlock_bh(&idev->lock);
879 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
880 NULL, 0);
881 in6_dev_put(idev);
882 return 0;
883 }
884 }
885
886 mc = mca_alloc(idev, addr);
887 if (!mc) {
888 write_unlock_bh(&idev->lock);
889 in6_dev_put(idev);
890 return -ENOMEM;
891 }
892
893 mc->next = idev->mc_list;
894 idev->mc_list = mc;
895
896 /* Hold this for the code below before we unlock,
897 * it is already exposed via idev->mc_list.
898 */
899 mca_get(mc);
900 write_unlock_bh(&idev->lock);
901
902 mld_del_delrec(idev, &mc->mca_addr);
903 igmp6_group_added(mc);
904 ma_put(mc);
905 return 0;
906 }
907
908 /*
909 * device multicast group del
910 */
911 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
912 {
913 struct ifmcaddr6 *ma, **map;
914
915 ASSERT_RTNL();
916
917 write_lock_bh(&idev->lock);
918 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
919 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
920 if (--ma->mca_users == 0) {
921 *map = ma->next;
922 write_unlock_bh(&idev->lock);
923
924 igmp6_group_dropped(ma);
925
926 ma_put(ma);
927 return 0;
928 }
929 write_unlock_bh(&idev->lock);
930 return 0;
931 }
932 }
933 write_unlock_bh(&idev->lock);
934
935 return -ENOENT;
936 }
937
938 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
939 {
940 struct inet6_dev *idev;
941 int err;
942
943 ASSERT_RTNL();
944
945 idev = __in6_dev_get(dev);
946 if (!idev)
947 err = -ENODEV;
948 else
949 err = __ipv6_dev_mc_dec(idev, addr);
950
951 return err;
952 }
953
954 /*
955 * check if the interface/address pair is valid
956 */
957 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
958 const struct in6_addr *src_addr)
959 {
960 struct inet6_dev *idev;
961 struct ifmcaddr6 *mc;
962 bool rv = false;
963
964 rcu_read_lock();
965 idev = __in6_dev_get(dev);
966 if (idev) {
967 read_lock_bh(&idev->lock);
968 for (mc = idev->mc_list; mc; mc = mc->next) {
969 if (ipv6_addr_equal(&mc->mca_addr, group))
970 break;
971 }
972 if (mc) {
973 if (src_addr && !ipv6_addr_any(src_addr)) {
974 struct ip6_sf_list *psf;
975
976 spin_lock_bh(&mc->mca_lock);
977 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
978 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
979 break;
980 }
981 if (psf)
982 rv = psf->sf_count[MCAST_INCLUDE] ||
983 psf->sf_count[MCAST_EXCLUDE] !=
984 mc->mca_sfcount[MCAST_EXCLUDE];
985 else
986 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
987 spin_unlock_bh(&mc->mca_lock);
988 } else
989 rv = true; /* don't filter unspecified source */
990 }
991 read_unlock_bh(&idev->lock);
992 }
993 rcu_read_unlock();
994 return rv;
995 }
996
997 static void mld_gq_start_timer(struct inet6_dev *idev)
998 {
999 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1000
1001 idev->mc_gq_running = 1;
1002 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1003 in6_dev_hold(idev);
1004 }
1005
1006 static void mld_gq_stop_timer(struct inet6_dev *idev)
1007 {
1008 idev->mc_gq_running = 0;
1009 if (del_timer(&idev->mc_gq_timer))
1010 __in6_dev_put(idev);
1011 }
1012
1013 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1014 {
1015 unsigned long tv = prandom_u32() % delay;
1016
1017 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1018 in6_dev_hold(idev);
1019 }
1020
1021 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1022 {
1023 idev->mc_ifc_count = 0;
1024 if (del_timer(&idev->mc_ifc_timer))
1025 __in6_dev_put(idev);
1026 }
1027
1028 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1029 {
1030 unsigned long tv = prandom_u32() % delay;
1031
1032 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1033 in6_dev_hold(idev);
1034 }
1035
1036 static void mld_dad_stop_timer(struct inet6_dev *idev)
1037 {
1038 if (del_timer(&idev->mc_dad_timer))
1039 __in6_dev_put(idev);
1040 }
1041
1042 /*
1043 * IGMP handling (alias multicast ICMPv6 messages)
1044 */
1045
1046 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1047 {
1048 unsigned long delay = resptime;
1049
1050 /* Do not start timer for these addresses */
1051 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1052 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1053 return;
1054
1055 if (del_timer(&ma->mca_timer)) {
1056 atomic_dec(&ma->mca_refcnt);
1057 delay = ma->mca_timer.expires - jiffies;
1058 }
1059
1060 if (delay >= resptime)
1061 delay = prandom_u32() % resptime;
1062
1063 ma->mca_timer.expires = jiffies + delay;
1064 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1065 atomic_inc(&ma->mca_refcnt);
1066 ma->mca_flags |= MAF_TIMER_RUNNING;
1067 }
1068
1069 /* mark EXCLUDE-mode sources */
1070 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1071 const struct in6_addr *srcs)
1072 {
1073 struct ip6_sf_list *psf;
1074 int i, scount;
1075
1076 scount = 0;
1077 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1078 if (scount == nsrcs)
1079 break;
1080 for (i = 0; i < nsrcs; i++) {
1081 /* skip inactive filters */
1082 if (psf->sf_count[MCAST_INCLUDE] ||
1083 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1084 psf->sf_count[MCAST_EXCLUDE])
1085 break;
1086 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1087 scount++;
1088 break;
1089 }
1090 }
1091 }
1092 pmc->mca_flags &= ~MAF_GSQUERY;
1093 if (scount == nsrcs) /* all sources excluded */
1094 return false;
1095 return true;
1096 }
1097
1098 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1099 const struct in6_addr *srcs)
1100 {
1101 struct ip6_sf_list *psf;
1102 int i, scount;
1103
1104 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1105 return mld_xmarksources(pmc, nsrcs, srcs);
1106
1107 /* mark INCLUDE-mode sources */
1108
1109 scount = 0;
1110 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1111 if (scount == nsrcs)
1112 break;
1113 for (i = 0; i < nsrcs; i++) {
1114 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1115 psf->sf_gsresp = 1;
1116 scount++;
1117 break;
1118 }
1119 }
1120 }
1121 if (!scount) {
1122 pmc->mca_flags &= ~MAF_GSQUERY;
1123 return false;
1124 }
1125 pmc->mca_flags |= MAF_GSQUERY;
1126 return true;
1127 }
1128
1129 static int mld_force_mld_version(const struct inet6_dev *idev)
1130 {
1131 /* Normally, both are 0 here. If enforcement to a particular is
1132 * being used, individual device enforcement will have a lower
1133 * precedence over 'all' device (.../conf/all/force_mld_version).
1134 */
1135
1136 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1137 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1138 else
1139 return idev->cnf.force_mld_version;
1140 }
1141
1142 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1143 {
1144 return mld_force_mld_version(idev) == 2;
1145 }
1146
1147 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1148 {
1149 return mld_force_mld_version(idev) == 1;
1150 }
1151
1152 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1153 {
1154 if (mld_in_v2_mode_only(idev))
1155 return false;
1156 if (mld_in_v1_mode_only(idev))
1157 return true;
1158 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1159 return true;
1160
1161 return false;
1162 }
1163
1164 static void mld_set_v1_mode(struct inet6_dev *idev)
1165 {
1166 /* RFC3810, relevant sections:
1167 * - 9.1. Robustness Variable
1168 * - 9.2. Query Interval
1169 * - 9.3. Query Response Interval
1170 * - 9.12. Older Version Querier Present Timeout
1171 */
1172 unsigned long switchback;
1173
1174 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1175
1176 idev->mc_v1_seen = jiffies + switchback;
1177 }
1178
1179 static void mld_update_qrv(struct inet6_dev *idev,
1180 const struct mld2_query *mlh2)
1181 {
1182 /* RFC3810, relevant sections:
1183 * - 5.1.8. QRV (Querier's Robustness Variable)
1184 * - 9.1. Robustness Variable
1185 */
1186
1187 /* The value of the Robustness Variable MUST NOT be zero,
1188 * and SHOULD NOT be one. Catch this here if we ever run
1189 * into such a case in future.
1190 */
1191 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1192 WARN_ON(idev->mc_qrv == 0);
1193
1194 if (mlh2->mld2q_qrv > 0)
1195 idev->mc_qrv = mlh2->mld2q_qrv;
1196
1197 if (unlikely(idev->mc_qrv < min_qrv)) {
1198 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1199 idev->mc_qrv, min_qrv);
1200 idev->mc_qrv = min_qrv;
1201 }
1202 }
1203
1204 static void mld_update_qi(struct inet6_dev *idev,
1205 const struct mld2_query *mlh2)
1206 {
1207 /* RFC3810, relevant sections:
1208 * - 5.1.9. QQIC (Querier's Query Interval Code)
1209 * - 9.2. Query Interval
1210 * - 9.12. Older Version Querier Present Timeout
1211 * (the [Query Interval] in the last Query received)
1212 */
1213 unsigned long mc_qqi;
1214
1215 if (mlh2->mld2q_qqic < 128) {
1216 mc_qqi = mlh2->mld2q_qqic;
1217 } else {
1218 unsigned long mc_man, mc_exp;
1219
1220 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1221 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1222
1223 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1224 }
1225
1226 idev->mc_qi = mc_qqi * HZ;
1227 }
1228
1229 static void mld_update_qri(struct inet6_dev *idev,
1230 const struct mld2_query *mlh2)
1231 {
1232 /* RFC3810, relevant sections:
1233 * - 5.1.3. Maximum Response Code
1234 * - 9.3. Query Response Interval
1235 */
1236 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1237 }
1238
1239 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1240 unsigned long *max_delay, bool v1_query)
1241 {
1242 unsigned long mldv1_md;
1243
1244 /* Ignore v1 queries */
1245 if (mld_in_v2_mode_only(idev))
1246 return -EINVAL;
1247
1248 mldv1_md = ntohs(mld->mld_maxdelay);
1249
1250 /* When in MLDv1 fallback and a MLDv2 router start-up being
1251 * unaware of current MLDv1 operation, the MRC == MRD mapping
1252 * only works when the exponential algorithm is not being
1253 * used (as MLDv1 is unaware of such things).
1254 *
1255 * According to the RFC author, the MLDv2 implementations
1256 * he's aware of all use a MRC < 32768 on start up queries.
1257 *
1258 * Thus, should we *ever* encounter something else larger
1259 * than that, just assume the maximum possible within our
1260 * reach.
1261 */
1262 if (!v1_query)
1263 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1264
1265 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1266
1267 /* MLDv1 router present: we need to go into v1 mode *only*
1268 * when an MLDv1 query is received as per section 9.12. of
1269 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1270 * queries MUST be of exactly 24 octets.
1271 */
1272 if (v1_query)
1273 mld_set_v1_mode(idev);
1274
1275 /* cancel MLDv2 report timer */
1276 mld_gq_stop_timer(idev);
1277 /* cancel the interface change timer */
1278 mld_ifc_stop_timer(idev);
1279 /* clear deleted report items */
1280 mld_clear_delrec(idev);
1281
1282 return 0;
1283 }
1284
1285 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1286 unsigned long *max_delay)
1287 {
1288 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1289
1290 mld_update_qrv(idev, mld);
1291 mld_update_qi(idev, mld);
1292 mld_update_qri(idev, mld);
1293
1294 idev->mc_maxdelay = *max_delay;
1295
1296 return 0;
1297 }
1298
1299 /* called with rcu_read_lock() */
1300 int igmp6_event_query(struct sk_buff *skb)
1301 {
1302 struct mld2_query *mlh2 = NULL;
1303 struct ifmcaddr6 *ma;
1304 const struct in6_addr *group;
1305 unsigned long max_delay;
1306 struct inet6_dev *idev;
1307 struct mld_msg *mld;
1308 int group_type;
1309 int mark = 0;
1310 int len, err;
1311
1312 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1313 return -EINVAL;
1314
1315 /* compute payload length excluding extension headers */
1316 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1317 len -= skb_network_header_len(skb);
1318
1319 /* RFC3810 6.2
1320 * Upon reception of an MLD message that contains a Query, the node
1321 * checks if the source address of the message is a valid link-local
1322 * address, if the Hop Limit is set to 1, and if the Router Alert
1323 * option is present in the Hop-By-Hop Options header of the IPv6
1324 * packet. If any of these checks fails, the packet is dropped.
1325 */
1326 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1327 ipv6_hdr(skb)->hop_limit != 1 ||
1328 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1329 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1330 return -EINVAL;
1331
1332 idev = __in6_dev_get(skb->dev);
1333 if (idev == NULL)
1334 return 0;
1335
1336 mld = (struct mld_msg *)icmp6_hdr(skb);
1337 group = &mld->mld_mca;
1338 group_type = ipv6_addr_type(group);
1339
1340 if (group_type != IPV6_ADDR_ANY &&
1341 !(group_type&IPV6_ADDR_MULTICAST))
1342 return -EINVAL;
1343
1344 if (len < MLD_V1_QUERY_LEN) {
1345 return -EINVAL;
1346 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1347 err = mld_process_v1(idev, mld, &max_delay,
1348 len == MLD_V1_QUERY_LEN);
1349 if (err < 0)
1350 return err;
1351 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1352 int srcs_offset = sizeof(struct mld2_query) -
1353 sizeof(struct icmp6hdr);
1354
1355 if (!pskb_may_pull(skb, srcs_offset))
1356 return -EINVAL;
1357
1358 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1359
1360 err = mld_process_v2(idev, mlh2, &max_delay);
1361 if (err < 0)
1362 return err;
1363
1364 if (group_type == IPV6_ADDR_ANY) { /* general query */
1365 if (mlh2->mld2q_nsrcs)
1366 return -EINVAL; /* no sources allowed */
1367
1368 mld_gq_start_timer(idev);
1369 return 0;
1370 }
1371 /* mark sources to include, if group & source-specific */
1372 if (mlh2->mld2q_nsrcs != 0) {
1373 if (!pskb_may_pull(skb, srcs_offset +
1374 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1375 return -EINVAL;
1376
1377 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1378 mark = 1;
1379 }
1380 } else {
1381 return -EINVAL;
1382 }
1383
1384 read_lock_bh(&idev->lock);
1385 if (group_type == IPV6_ADDR_ANY) {
1386 for (ma = idev->mc_list; ma; ma = ma->next) {
1387 spin_lock_bh(&ma->mca_lock);
1388 igmp6_group_queried(ma, max_delay);
1389 spin_unlock_bh(&ma->mca_lock);
1390 }
1391 } else {
1392 for (ma = idev->mc_list; ma; ma = ma->next) {
1393 if (!ipv6_addr_equal(group, &ma->mca_addr))
1394 continue;
1395 spin_lock_bh(&ma->mca_lock);
1396 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1397 /* gsquery <- gsquery && mark */
1398 if (!mark)
1399 ma->mca_flags &= ~MAF_GSQUERY;
1400 } else {
1401 /* gsquery <- mark */
1402 if (mark)
1403 ma->mca_flags |= MAF_GSQUERY;
1404 else
1405 ma->mca_flags &= ~MAF_GSQUERY;
1406 }
1407 if (!(ma->mca_flags & MAF_GSQUERY) ||
1408 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1409 igmp6_group_queried(ma, max_delay);
1410 spin_unlock_bh(&ma->mca_lock);
1411 break;
1412 }
1413 }
1414 read_unlock_bh(&idev->lock);
1415
1416 return 0;
1417 }
1418
1419 /* called with rcu_read_lock() */
1420 int igmp6_event_report(struct sk_buff *skb)
1421 {
1422 struct ifmcaddr6 *ma;
1423 struct inet6_dev *idev;
1424 struct mld_msg *mld;
1425 int addr_type;
1426
1427 /* Our own report looped back. Ignore it. */
1428 if (skb->pkt_type == PACKET_LOOPBACK)
1429 return 0;
1430
1431 /* send our report if the MC router may not have heard this report */
1432 if (skb->pkt_type != PACKET_MULTICAST &&
1433 skb->pkt_type != PACKET_BROADCAST)
1434 return 0;
1435
1436 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1437 return -EINVAL;
1438
1439 mld = (struct mld_msg *)icmp6_hdr(skb);
1440
1441 /* Drop reports with not link local source */
1442 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1443 if (addr_type != IPV6_ADDR_ANY &&
1444 !(addr_type&IPV6_ADDR_LINKLOCAL))
1445 return -EINVAL;
1446
1447 idev = __in6_dev_get(skb->dev);
1448 if (idev == NULL)
1449 return -ENODEV;
1450
1451 /*
1452 * Cancel the timer for this group
1453 */
1454
1455 read_lock_bh(&idev->lock);
1456 for (ma = idev->mc_list; ma; ma = ma->next) {
1457 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1458 spin_lock(&ma->mca_lock);
1459 if (del_timer(&ma->mca_timer))
1460 atomic_dec(&ma->mca_refcnt);
1461 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1462 spin_unlock(&ma->mca_lock);
1463 break;
1464 }
1465 }
1466 read_unlock_bh(&idev->lock);
1467 return 0;
1468 }
1469
1470 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1471 int gdeleted, int sdeleted)
1472 {
1473 switch (type) {
1474 case MLD2_MODE_IS_INCLUDE:
1475 case MLD2_MODE_IS_EXCLUDE:
1476 if (gdeleted || sdeleted)
1477 return false;
1478 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1479 if (pmc->mca_sfmode == MCAST_INCLUDE)
1480 return true;
1481 /* don't include if this source is excluded
1482 * in all filters
1483 */
1484 if (psf->sf_count[MCAST_INCLUDE])
1485 return type == MLD2_MODE_IS_INCLUDE;
1486 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1487 psf->sf_count[MCAST_EXCLUDE];
1488 }
1489 return false;
1490 case MLD2_CHANGE_TO_INCLUDE:
1491 if (gdeleted || sdeleted)
1492 return false;
1493 return psf->sf_count[MCAST_INCLUDE] != 0;
1494 case MLD2_CHANGE_TO_EXCLUDE:
1495 if (gdeleted || sdeleted)
1496 return false;
1497 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1498 psf->sf_count[MCAST_INCLUDE])
1499 return false;
1500 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1501 psf->sf_count[MCAST_EXCLUDE];
1502 case MLD2_ALLOW_NEW_SOURCES:
1503 if (gdeleted || !psf->sf_crcount)
1504 return false;
1505 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1506 case MLD2_BLOCK_OLD_SOURCES:
1507 if (pmc->mca_sfmode == MCAST_INCLUDE)
1508 return gdeleted || (psf->sf_crcount && sdeleted);
1509 return psf->sf_crcount && !gdeleted && !sdeleted;
1510 }
1511 return false;
1512 }
1513
1514 static int
1515 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1516 {
1517 struct ip6_sf_list *psf;
1518 int scount = 0;
1519
1520 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1521 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1522 continue;
1523 scount++;
1524 }
1525 return scount;
1526 }
1527
1528 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1529 struct net_device *dev,
1530 const struct in6_addr *saddr,
1531 const struct in6_addr *daddr,
1532 int proto, int len)
1533 {
1534 struct ipv6hdr *hdr;
1535
1536 skb->protocol = htons(ETH_P_IPV6);
1537 skb->dev = dev;
1538
1539 skb_reset_network_header(skb);
1540 skb_put(skb, sizeof(struct ipv6hdr));
1541 hdr = ipv6_hdr(skb);
1542
1543 ip6_flow_hdr(hdr, 0, 0);
1544
1545 hdr->payload_len = htons(len);
1546 hdr->nexthdr = proto;
1547 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1548
1549 hdr->saddr = *saddr;
1550 hdr->daddr = *daddr;
1551 }
1552
1553 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1554 {
1555 struct net_device *dev = idev->dev;
1556 struct net *net = dev_net(dev);
1557 struct sock *sk = net->ipv6.igmp_sk;
1558 struct sk_buff *skb;
1559 struct mld2_report *pmr;
1560 struct in6_addr addr_buf;
1561 const struct in6_addr *saddr;
1562 int hlen = LL_RESERVED_SPACE(dev);
1563 int tlen = dev->needed_tailroom;
1564 unsigned int size = mtu + hlen + tlen;
1565 int err;
1566 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1567 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1568 IPV6_TLV_PADN, 0 };
1569
1570 /* we assume size > sizeof(ra) here */
1571 /* limit our allocations to order-0 page */
1572 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1573 skb = sock_alloc_send_skb(sk, size, 1, &err);
1574
1575 if (!skb)
1576 return NULL;
1577
1578 skb->priority = TC_PRIO_CONTROL;
1579 skb->reserved_tailroom = skb_end_offset(skb) -
1580 min(mtu, skb_end_offset(skb));
1581 skb_reserve(skb, hlen);
1582
1583 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1584 /* <draft-ietf-magma-mld-source-05.txt>:
1585 * use unspecified address as the source address
1586 * when a valid link-local address is not available.
1587 */
1588 saddr = &in6addr_any;
1589 } else
1590 saddr = &addr_buf;
1591
1592 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1593
1594 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1595
1596 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1597 skb_put(skb, sizeof(*pmr));
1598 pmr = (struct mld2_report *)skb_transport_header(skb);
1599 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1600 pmr->mld2r_resv1 = 0;
1601 pmr->mld2r_cksum = 0;
1602 pmr->mld2r_resv2 = 0;
1603 pmr->mld2r_ngrec = 0;
1604 return skb;
1605 }
1606
1607 static void mld_sendpack(struct sk_buff *skb)
1608 {
1609 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1610 struct mld2_report *pmr =
1611 (struct mld2_report *)skb_transport_header(skb);
1612 int payload_len, mldlen;
1613 struct inet6_dev *idev;
1614 struct net *net = dev_net(skb->dev);
1615 int err;
1616 struct flowi6 fl6;
1617 struct dst_entry *dst;
1618
1619 rcu_read_lock();
1620 idev = __in6_dev_get(skb->dev);
1621 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1622
1623 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1624 sizeof(*pip6);
1625 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1626 pip6->payload_len = htons(payload_len);
1627
1628 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1629 IPPROTO_ICMPV6,
1630 csum_partial(skb_transport_header(skb),
1631 mldlen, 0));
1632
1633 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1634 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1635 skb->dev->ifindex);
1636 dst = icmp6_dst_alloc(skb->dev, &fl6);
1637
1638 err = 0;
1639 if (IS_ERR(dst)) {
1640 err = PTR_ERR(dst);
1641 dst = NULL;
1642 }
1643 skb_dst_set(skb, dst);
1644 if (err)
1645 goto err_out;
1646
1647 payload_len = skb->len;
1648
1649 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1650 dst_output);
1651 out:
1652 if (!err) {
1653 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1654 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1655 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1656 } else {
1657 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1658 }
1659
1660 rcu_read_unlock();
1661 return;
1662
1663 err_out:
1664 kfree_skb(skb);
1665 goto out;
1666 }
1667
1668 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1669 {
1670 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1671 }
1672
1673 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1674 int type, struct mld2_grec **ppgr)
1675 {
1676 struct net_device *dev = pmc->idev->dev;
1677 struct mld2_report *pmr;
1678 struct mld2_grec *pgr;
1679
1680 if (!skb)
1681 skb = mld_newpack(pmc->idev, dev->mtu);
1682 if (!skb)
1683 return NULL;
1684 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1685 pgr->grec_type = type;
1686 pgr->grec_auxwords = 0;
1687 pgr->grec_nsrcs = 0;
1688 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1689 pmr = (struct mld2_report *)skb_transport_header(skb);
1690 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1691 *ppgr = pgr;
1692 return skb;
1693 }
1694
1695 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1696
1697 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1698 int type, int gdeleted, int sdeleted, int crsend)
1699 {
1700 struct inet6_dev *idev = pmc->idev;
1701 struct net_device *dev = idev->dev;
1702 struct mld2_report *pmr;
1703 struct mld2_grec *pgr = NULL;
1704 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1705 int scount, stotal, first, isquery, truncate;
1706
1707 if (pmc->mca_flags & MAF_NOREPORT)
1708 return skb;
1709
1710 isquery = type == MLD2_MODE_IS_INCLUDE ||
1711 type == MLD2_MODE_IS_EXCLUDE;
1712 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1713 type == MLD2_CHANGE_TO_EXCLUDE;
1714
1715 stotal = scount = 0;
1716
1717 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1718
1719 if (!*psf_list)
1720 goto empty_source;
1721
1722 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1723
1724 /* EX and TO_EX get a fresh packet, if needed */
1725 if (truncate) {
1726 if (pmr && pmr->mld2r_ngrec &&
1727 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1728 if (skb)
1729 mld_sendpack(skb);
1730 skb = mld_newpack(idev, dev->mtu);
1731 }
1732 }
1733 first = 1;
1734 psf_prev = NULL;
1735 for (psf = *psf_list; psf; psf = psf_next) {
1736 struct in6_addr *psrc;
1737
1738 psf_next = psf->sf_next;
1739
1740 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1741 psf_prev = psf;
1742 continue;
1743 }
1744
1745 /* clear marks on query responses */
1746 if (isquery)
1747 psf->sf_gsresp = 0;
1748
1749 if (AVAILABLE(skb) < sizeof(*psrc) +
1750 first*sizeof(struct mld2_grec)) {
1751 if (truncate && !first)
1752 break; /* truncate these */
1753 if (pgr)
1754 pgr->grec_nsrcs = htons(scount);
1755 if (skb)
1756 mld_sendpack(skb);
1757 skb = mld_newpack(idev, dev->mtu);
1758 first = 1;
1759 scount = 0;
1760 }
1761 if (first) {
1762 skb = add_grhead(skb, pmc, type, &pgr);
1763 first = 0;
1764 }
1765 if (!skb)
1766 return NULL;
1767 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1768 *psrc = psf->sf_addr;
1769 scount++; stotal++;
1770 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1771 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1772 psf->sf_crcount--;
1773 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1774 if (psf_prev)
1775 psf_prev->sf_next = psf->sf_next;
1776 else
1777 *psf_list = psf->sf_next;
1778 kfree(psf);
1779 continue;
1780 }
1781 }
1782 psf_prev = psf;
1783 }
1784
1785 empty_source:
1786 if (!stotal) {
1787 if (type == MLD2_ALLOW_NEW_SOURCES ||
1788 type == MLD2_BLOCK_OLD_SOURCES)
1789 return skb;
1790 if (pmc->mca_crcount || isquery || crsend) {
1791 /* make sure we have room for group header */
1792 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1793 mld_sendpack(skb);
1794 skb = NULL; /* add_grhead will get a new one */
1795 }
1796 skb = add_grhead(skb, pmc, type, &pgr);
1797 }
1798 }
1799 if (pgr)
1800 pgr->grec_nsrcs = htons(scount);
1801
1802 if (isquery)
1803 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1804 return skb;
1805 }
1806
1807 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1808 {
1809 struct sk_buff *skb = NULL;
1810 int type;
1811
1812 read_lock_bh(&idev->lock);
1813 if (!pmc) {
1814 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1815 if (pmc->mca_flags & MAF_NOREPORT)
1816 continue;
1817 spin_lock_bh(&pmc->mca_lock);
1818 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1819 type = MLD2_MODE_IS_EXCLUDE;
1820 else
1821 type = MLD2_MODE_IS_INCLUDE;
1822 skb = add_grec(skb, pmc, type, 0, 0, 0);
1823 spin_unlock_bh(&pmc->mca_lock);
1824 }
1825 } else {
1826 spin_lock_bh(&pmc->mca_lock);
1827 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1828 type = MLD2_MODE_IS_EXCLUDE;
1829 else
1830 type = MLD2_MODE_IS_INCLUDE;
1831 skb = add_grec(skb, pmc, type, 0, 0, 0);
1832 spin_unlock_bh(&pmc->mca_lock);
1833 }
1834 read_unlock_bh(&idev->lock);
1835 if (skb)
1836 mld_sendpack(skb);
1837 }
1838
1839 /*
1840 * remove zero-count source records from a source filter list
1841 */
1842 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1843 {
1844 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1845
1846 psf_prev = NULL;
1847 for (psf = *ppsf; psf; psf = psf_next) {
1848 psf_next = psf->sf_next;
1849 if (psf->sf_crcount == 0) {
1850 if (psf_prev)
1851 psf_prev->sf_next = psf->sf_next;
1852 else
1853 *ppsf = psf->sf_next;
1854 kfree(psf);
1855 } else
1856 psf_prev = psf;
1857 }
1858 }
1859
1860 static void mld_send_cr(struct inet6_dev *idev)
1861 {
1862 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1863 struct sk_buff *skb = NULL;
1864 int type, dtype;
1865
1866 read_lock_bh(&idev->lock);
1867 spin_lock(&idev->mc_lock);
1868
1869 /* deleted MCA's */
1870 pmc_prev = NULL;
1871 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1872 pmc_next = pmc->next;
1873 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1874 type = MLD2_BLOCK_OLD_SOURCES;
1875 dtype = MLD2_BLOCK_OLD_SOURCES;
1876 skb = add_grec(skb, pmc, type, 1, 0, 0);
1877 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1878 }
1879 if (pmc->mca_crcount) {
1880 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1881 type = MLD2_CHANGE_TO_INCLUDE;
1882 skb = add_grec(skb, pmc, type, 1, 0, 0);
1883 }
1884 pmc->mca_crcount--;
1885 if (pmc->mca_crcount == 0) {
1886 mld_clear_zeros(&pmc->mca_tomb);
1887 mld_clear_zeros(&pmc->mca_sources);
1888 }
1889 }
1890 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1891 !pmc->mca_sources) {
1892 if (pmc_prev)
1893 pmc_prev->next = pmc_next;
1894 else
1895 idev->mc_tomb = pmc_next;
1896 in6_dev_put(pmc->idev);
1897 kfree(pmc);
1898 } else
1899 pmc_prev = pmc;
1900 }
1901 spin_unlock(&idev->mc_lock);
1902
1903 /* change recs */
1904 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1905 spin_lock_bh(&pmc->mca_lock);
1906 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1907 type = MLD2_BLOCK_OLD_SOURCES;
1908 dtype = MLD2_ALLOW_NEW_SOURCES;
1909 } else {
1910 type = MLD2_ALLOW_NEW_SOURCES;
1911 dtype = MLD2_BLOCK_OLD_SOURCES;
1912 }
1913 skb = add_grec(skb, pmc, type, 0, 0, 0);
1914 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1915
1916 /* filter mode changes */
1917 if (pmc->mca_crcount) {
1918 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1919 type = MLD2_CHANGE_TO_EXCLUDE;
1920 else
1921 type = MLD2_CHANGE_TO_INCLUDE;
1922 skb = add_grec(skb, pmc, type, 0, 0, 0);
1923 pmc->mca_crcount--;
1924 }
1925 spin_unlock_bh(&pmc->mca_lock);
1926 }
1927 read_unlock_bh(&idev->lock);
1928 if (!skb)
1929 return;
1930 (void) mld_sendpack(skb);
1931 }
1932
1933 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1934 {
1935 struct net *net = dev_net(dev);
1936 struct sock *sk = net->ipv6.igmp_sk;
1937 struct inet6_dev *idev;
1938 struct sk_buff *skb;
1939 struct mld_msg *hdr;
1940 const struct in6_addr *snd_addr, *saddr;
1941 struct in6_addr addr_buf;
1942 int hlen = LL_RESERVED_SPACE(dev);
1943 int tlen = dev->needed_tailroom;
1944 int err, len, payload_len, full_len;
1945 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1946 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1947 IPV6_TLV_PADN, 0 };
1948 struct flowi6 fl6;
1949 struct dst_entry *dst;
1950
1951 if (type == ICMPV6_MGM_REDUCTION)
1952 snd_addr = &in6addr_linklocal_allrouters;
1953 else
1954 snd_addr = addr;
1955
1956 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1957 payload_len = len + sizeof(ra);
1958 full_len = sizeof(struct ipv6hdr) + payload_len;
1959
1960 rcu_read_lock();
1961 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1962 IPSTATS_MIB_OUT, full_len);
1963 rcu_read_unlock();
1964
1965 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1966
1967 if (skb == NULL) {
1968 rcu_read_lock();
1969 IP6_INC_STATS(net, __in6_dev_get(dev),
1970 IPSTATS_MIB_OUTDISCARDS);
1971 rcu_read_unlock();
1972 return;
1973 }
1974 skb->priority = TC_PRIO_CONTROL;
1975 skb_reserve(skb, hlen);
1976
1977 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1978 /* <draft-ietf-magma-mld-source-05.txt>:
1979 * use unspecified address as the source address
1980 * when a valid link-local address is not available.
1981 */
1982 saddr = &in6addr_any;
1983 } else
1984 saddr = &addr_buf;
1985
1986 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1987
1988 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1989
1990 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1991 memset(hdr, 0, sizeof(struct mld_msg));
1992 hdr->mld_type = type;
1993 hdr->mld_mca = *addr;
1994
1995 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1996 IPPROTO_ICMPV6,
1997 csum_partial(hdr, len, 0));
1998
1999 rcu_read_lock();
2000 idev = __in6_dev_get(skb->dev);
2001
2002 icmpv6_flow_init(sk, &fl6, type,
2003 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2004 skb->dev->ifindex);
2005 dst = icmp6_dst_alloc(skb->dev, &fl6);
2006 if (IS_ERR(dst)) {
2007 err = PTR_ERR(dst);
2008 goto err_out;
2009 }
2010
2011 skb_dst_set(skb, dst);
2012 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
2013 dst_output);
2014 out:
2015 if (!err) {
2016 ICMP6MSGOUT_INC_STATS(net, idev, type);
2017 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2018 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
2019 } else
2020 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2021
2022 rcu_read_unlock();
2023 return;
2024
2025 err_out:
2026 kfree_skb(skb);
2027 goto out;
2028 }
2029
2030 static void mld_send_initial_cr(struct inet6_dev *idev)
2031 {
2032 struct sk_buff *skb;
2033 struct ifmcaddr6 *pmc;
2034 int type;
2035
2036 if (mld_in_v1_mode(idev))
2037 return;
2038
2039 skb = NULL;
2040 read_lock_bh(&idev->lock);
2041 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2042 spin_lock_bh(&pmc->mca_lock);
2043 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2044 type = MLD2_CHANGE_TO_EXCLUDE;
2045 else
2046 type = MLD2_CHANGE_TO_INCLUDE;
2047 skb = add_grec(skb, pmc, type, 0, 0, 1);
2048 spin_unlock_bh(&pmc->mca_lock);
2049 }
2050 read_unlock_bh(&idev->lock);
2051 if (skb)
2052 mld_sendpack(skb);
2053 }
2054
2055 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2056 {
2057 idev->mc_dad_count = idev->mc_qrv;
2058 if (idev->mc_dad_count) {
2059 mld_send_initial_cr(idev);
2060 idev->mc_dad_count--;
2061 if (idev->mc_dad_count)
2062 mld_dad_start_timer(idev, idev->mc_maxdelay);
2063 }
2064 }
2065
2066 static void mld_dad_timer_expire(unsigned long data)
2067 {
2068 struct inet6_dev *idev = (struct inet6_dev *)data;
2069
2070 mld_send_initial_cr(idev);
2071 if (idev->mc_dad_count) {
2072 idev->mc_dad_count--;
2073 if (idev->mc_dad_count)
2074 mld_dad_start_timer(idev, idev->mc_maxdelay);
2075 }
2076 in6_dev_put(idev);
2077 }
2078
2079 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2080 const struct in6_addr *psfsrc)
2081 {
2082 struct ip6_sf_list *psf, *psf_prev;
2083 int rv = 0;
2084
2085 psf_prev = NULL;
2086 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2087 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2088 break;
2089 psf_prev = psf;
2090 }
2091 if (!psf || psf->sf_count[sfmode] == 0) {
2092 /* source filter not found, or count wrong => bug */
2093 return -ESRCH;
2094 }
2095 psf->sf_count[sfmode]--;
2096 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2097 struct inet6_dev *idev = pmc->idev;
2098
2099 /* no more filters for this source */
2100 if (psf_prev)
2101 psf_prev->sf_next = psf->sf_next;
2102 else
2103 pmc->mca_sources = psf->sf_next;
2104 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2105 !mld_in_v1_mode(idev)) {
2106 psf->sf_crcount = idev->mc_qrv;
2107 psf->sf_next = pmc->mca_tomb;
2108 pmc->mca_tomb = psf;
2109 rv = 1;
2110 } else
2111 kfree(psf);
2112 }
2113 return rv;
2114 }
2115
2116 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2117 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2118 int delta)
2119 {
2120 struct ifmcaddr6 *pmc;
2121 int changerec = 0;
2122 int i, err;
2123
2124 if (!idev)
2125 return -ENODEV;
2126 read_lock_bh(&idev->lock);
2127 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2128 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2129 break;
2130 }
2131 if (!pmc) {
2132 /* MCA not found?? bug */
2133 read_unlock_bh(&idev->lock);
2134 return -ESRCH;
2135 }
2136 spin_lock_bh(&pmc->mca_lock);
2137 sf_markstate(pmc);
2138 if (!delta) {
2139 if (!pmc->mca_sfcount[sfmode]) {
2140 spin_unlock_bh(&pmc->mca_lock);
2141 read_unlock_bh(&idev->lock);
2142 return -EINVAL;
2143 }
2144 pmc->mca_sfcount[sfmode]--;
2145 }
2146 err = 0;
2147 for (i = 0; i < sfcount; i++) {
2148 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2149
2150 changerec |= rv > 0;
2151 if (!err && rv < 0)
2152 err = rv;
2153 }
2154 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2155 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2156 pmc->mca_sfcount[MCAST_INCLUDE]) {
2157 struct ip6_sf_list *psf;
2158
2159 /* filter mode change */
2160 pmc->mca_sfmode = MCAST_INCLUDE;
2161 pmc->mca_crcount = idev->mc_qrv;
2162 idev->mc_ifc_count = pmc->mca_crcount;
2163 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2164 psf->sf_crcount = 0;
2165 mld_ifc_event(pmc->idev);
2166 } else if (sf_setstate(pmc) || changerec)
2167 mld_ifc_event(pmc->idev);
2168 spin_unlock_bh(&pmc->mca_lock);
2169 read_unlock_bh(&idev->lock);
2170 return err;
2171 }
2172
2173 /*
2174 * Add multicast single-source filter to the interface list
2175 */
2176 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2177 const struct in6_addr *psfsrc)
2178 {
2179 struct ip6_sf_list *psf, *psf_prev;
2180
2181 psf_prev = NULL;
2182 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2183 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2184 break;
2185 psf_prev = psf;
2186 }
2187 if (!psf) {
2188 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2189 if (!psf)
2190 return -ENOBUFS;
2191
2192 psf->sf_addr = *psfsrc;
2193 if (psf_prev) {
2194 psf_prev->sf_next = psf;
2195 } else
2196 pmc->mca_sources = psf;
2197 }
2198 psf->sf_count[sfmode]++;
2199 return 0;
2200 }
2201
2202 static void sf_markstate(struct ifmcaddr6 *pmc)
2203 {
2204 struct ip6_sf_list *psf;
2205 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2206
2207 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2208 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2209 psf->sf_oldin = mca_xcount ==
2210 psf->sf_count[MCAST_EXCLUDE] &&
2211 !psf->sf_count[MCAST_INCLUDE];
2212 } else
2213 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2214 }
2215
2216 static int sf_setstate(struct ifmcaddr6 *pmc)
2217 {
2218 struct ip6_sf_list *psf, *dpsf;
2219 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2220 int qrv = pmc->idev->mc_qrv;
2221 int new_in, rv;
2222
2223 rv = 0;
2224 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2225 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2226 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2227 !psf->sf_count[MCAST_INCLUDE];
2228 } else
2229 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2230 if (new_in) {
2231 if (!psf->sf_oldin) {
2232 struct ip6_sf_list *prev = NULL;
2233
2234 for (dpsf = pmc->mca_tomb; dpsf;
2235 dpsf = dpsf->sf_next) {
2236 if (ipv6_addr_equal(&dpsf->sf_addr,
2237 &psf->sf_addr))
2238 break;
2239 prev = dpsf;
2240 }
2241 if (dpsf) {
2242 if (prev)
2243 prev->sf_next = dpsf->sf_next;
2244 else
2245 pmc->mca_tomb = dpsf->sf_next;
2246 kfree(dpsf);
2247 }
2248 psf->sf_crcount = qrv;
2249 rv++;
2250 }
2251 } else if (psf->sf_oldin) {
2252 psf->sf_crcount = 0;
2253 /*
2254 * add or update "delete" records if an active filter
2255 * is now inactive
2256 */
2257 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2258 if (ipv6_addr_equal(&dpsf->sf_addr,
2259 &psf->sf_addr))
2260 break;
2261 if (!dpsf) {
2262 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2263 if (!dpsf)
2264 continue;
2265 *dpsf = *psf;
2266 /* pmc->mca_lock held by callers */
2267 dpsf->sf_next = pmc->mca_tomb;
2268 pmc->mca_tomb = dpsf;
2269 }
2270 dpsf->sf_crcount = qrv;
2271 rv++;
2272 }
2273 }
2274 return rv;
2275 }
2276
2277 /*
2278 * Add multicast source filter list to the interface list
2279 */
2280 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2281 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2282 int delta)
2283 {
2284 struct ifmcaddr6 *pmc;
2285 int isexclude;
2286 int i, err;
2287
2288 if (!idev)
2289 return -ENODEV;
2290 read_lock_bh(&idev->lock);
2291 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2292 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2293 break;
2294 }
2295 if (!pmc) {
2296 /* MCA not found?? bug */
2297 read_unlock_bh(&idev->lock);
2298 return -ESRCH;
2299 }
2300 spin_lock_bh(&pmc->mca_lock);
2301
2302 sf_markstate(pmc);
2303 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2304 if (!delta)
2305 pmc->mca_sfcount[sfmode]++;
2306 err = 0;
2307 for (i = 0; i < sfcount; i++) {
2308 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2309 if (err)
2310 break;
2311 }
2312 if (err) {
2313 int j;
2314
2315 if (!delta)
2316 pmc->mca_sfcount[sfmode]--;
2317 for (j = 0; j < i; j++)
2318 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2319 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2320 struct ip6_sf_list *psf;
2321
2322 /* filter mode change */
2323 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2324 pmc->mca_sfmode = MCAST_EXCLUDE;
2325 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2326 pmc->mca_sfmode = MCAST_INCLUDE;
2327 /* else no filters; keep old mode for reports */
2328
2329 pmc->mca_crcount = idev->mc_qrv;
2330 idev->mc_ifc_count = pmc->mca_crcount;
2331 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2332 psf->sf_crcount = 0;
2333 mld_ifc_event(idev);
2334 } else if (sf_setstate(pmc))
2335 mld_ifc_event(idev);
2336 spin_unlock_bh(&pmc->mca_lock);
2337 read_unlock_bh(&idev->lock);
2338 return err;
2339 }
2340
2341 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2342 {
2343 struct ip6_sf_list *psf, *nextpsf;
2344
2345 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2346 nextpsf = psf->sf_next;
2347 kfree(psf);
2348 }
2349 pmc->mca_tomb = NULL;
2350 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2351 nextpsf = psf->sf_next;
2352 kfree(psf);
2353 }
2354 pmc->mca_sources = NULL;
2355 pmc->mca_sfmode = MCAST_EXCLUDE;
2356 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2357 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2358 }
2359
2360
2361 static void igmp6_join_group(struct ifmcaddr6 *ma)
2362 {
2363 unsigned long delay;
2364
2365 if (ma->mca_flags & MAF_NOREPORT)
2366 return;
2367
2368 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2369
2370 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2371
2372 spin_lock_bh(&ma->mca_lock);
2373 if (del_timer(&ma->mca_timer)) {
2374 atomic_dec(&ma->mca_refcnt);
2375 delay = ma->mca_timer.expires - jiffies;
2376 }
2377
2378 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2379 atomic_inc(&ma->mca_refcnt);
2380 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2381 spin_unlock_bh(&ma->mca_lock);
2382 }
2383
2384 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2385 struct inet6_dev *idev)
2386 {
2387 int err;
2388
2389 /* callers have the socket lock and rtnl lock
2390 * so no other readers or writers of iml or its sflist
2391 */
2392 if (!iml->sflist) {
2393 /* any-source empty exclude case */
2394 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2395 }
2396 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2397 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2398 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2399 iml->sflist = NULL;
2400 return err;
2401 }
2402
2403 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2404 {
2405 if (mld_in_v1_mode(ma->idev)) {
2406 if (ma->mca_flags & MAF_LAST_REPORTER)
2407 igmp6_send(&ma->mca_addr, ma->idev->dev,
2408 ICMPV6_MGM_REDUCTION);
2409 } else {
2410 mld_add_delrec(ma->idev, ma);
2411 mld_ifc_event(ma->idev);
2412 }
2413 }
2414
2415 static void mld_gq_timer_expire(unsigned long data)
2416 {
2417 struct inet6_dev *idev = (struct inet6_dev *)data;
2418
2419 idev->mc_gq_running = 0;
2420 mld_send_report(idev, NULL);
2421 in6_dev_put(idev);
2422 }
2423
2424 static void mld_ifc_timer_expire(unsigned long data)
2425 {
2426 struct inet6_dev *idev = (struct inet6_dev *)data;
2427
2428 mld_send_cr(idev);
2429 if (idev->mc_ifc_count) {
2430 idev->mc_ifc_count--;
2431 if (idev->mc_ifc_count)
2432 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2433 }
2434 in6_dev_put(idev);
2435 }
2436
2437 static void mld_ifc_event(struct inet6_dev *idev)
2438 {
2439 if (mld_in_v1_mode(idev))
2440 return;
2441 idev->mc_ifc_count = idev->mc_qrv;
2442 mld_ifc_start_timer(idev, 1);
2443 }
2444
2445
2446 static void igmp6_timer_handler(unsigned long data)
2447 {
2448 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2449
2450 if (mld_in_v1_mode(ma->idev))
2451 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2452 else
2453 mld_send_report(ma->idev, ma);
2454
2455 spin_lock(&ma->mca_lock);
2456 ma->mca_flags |= MAF_LAST_REPORTER;
2457 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2458 spin_unlock(&ma->mca_lock);
2459 ma_put(ma);
2460 }
2461
2462 /* Device changing type */
2463
2464 void ipv6_mc_unmap(struct inet6_dev *idev)
2465 {
2466 struct ifmcaddr6 *i;
2467
2468 /* Install multicast list, except for all-nodes (already installed) */
2469
2470 read_lock_bh(&idev->lock);
2471 for (i = idev->mc_list; i; i = i->next)
2472 igmp6_group_dropped(i);
2473 read_unlock_bh(&idev->lock);
2474 }
2475
2476 void ipv6_mc_remap(struct inet6_dev *idev)
2477 {
2478 ipv6_mc_up(idev);
2479 }
2480
2481 /* Device going down */
2482
2483 void ipv6_mc_down(struct inet6_dev *idev)
2484 {
2485 struct ifmcaddr6 *i;
2486
2487 /* Withdraw multicast list */
2488
2489 read_lock_bh(&idev->lock);
2490 mld_ifc_stop_timer(idev);
2491 mld_gq_stop_timer(idev);
2492 mld_dad_stop_timer(idev);
2493
2494 for (i = idev->mc_list; i; i = i->next)
2495 igmp6_group_dropped(i);
2496 read_unlock_bh(&idev->lock);
2497
2498 mld_clear_delrec(idev);
2499 }
2500
2501 static void ipv6_mc_reset(struct inet6_dev *idev)
2502 {
2503 idev->mc_qrv = sysctl_mld_qrv;
2504 idev->mc_qi = MLD_QI_DEFAULT;
2505 idev->mc_qri = MLD_QRI_DEFAULT;
2506 idev->mc_v1_seen = 0;
2507 idev->mc_maxdelay = unsolicited_report_interval(idev);
2508 }
2509
2510 /* Device going up */
2511
2512 void ipv6_mc_up(struct inet6_dev *idev)
2513 {
2514 struct ifmcaddr6 *i;
2515
2516 /* Install multicast list, except for all-nodes (already installed) */
2517
2518 read_lock_bh(&idev->lock);
2519 ipv6_mc_reset(idev);
2520 for (i = idev->mc_list; i; i = i->next)
2521 igmp6_group_added(i);
2522 read_unlock_bh(&idev->lock);
2523 }
2524
2525 /* IPv6 device initialization. */
2526
2527 void ipv6_mc_init_dev(struct inet6_dev *idev)
2528 {
2529 write_lock_bh(&idev->lock);
2530 spin_lock_init(&idev->mc_lock);
2531 idev->mc_gq_running = 0;
2532 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2533 (unsigned long)idev);
2534 idev->mc_tomb = NULL;
2535 idev->mc_ifc_count = 0;
2536 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2537 (unsigned long)idev);
2538 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2539 (unsigned long)idev);
2540 ipv6_mc_reset(idev);
2541 write_unlock_bh(&idev->lock);
2542 }
2543
2544 /*
2545 * Device is about to be destroyed: clean up.
2546 */
2547
2548 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2549 {
2550 struct ifmcaddr6 *i;
2551
2552 /* Deactivate timers */
2553 ipv6_mc_down(idev);
2554
2555 /* Delete all-nodes address. */
2556 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2557 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2558 * fail.
2559 */
2560 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2561
2562 if (idev->cnf.forwarding)
2563 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2564
2565 write_lock_bh(&idev->lock);
2566 while ((i = idev->mc_list) != NULL) {
2567 idev->mc_list = i->next;
2568 write_unlock_bh(&idev->lock);
2569
2570 igmp6_group_dropped(i);
2571 ma_put(i);
2572
2573 write_lock_bh(&idev->lock);
2574 }
2575 write_unlock_bh(&idev->lock);
2576 }
2577
2578 #ifdef CONFIG_PROC_FS
2579 struct igmp6_mc_iter_state {
2580 struct seq_net_private p;
2581 struct net_device *dev;
2582 struct inet6_dev *idev;
2583 };
2584
2585 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2586
2587 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2588 {
2589 struct ifmcaddr6 *im = NULL;
2590 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2591 struct net *net = seq_file_net(seq);
2592
2593 state->idev = NULL;
2594 for_each_netdev_rcu(net, state->dev) {
2595 struct inet6_dev *idev;
2596 idev = __in6_dev_get(state->dev);
2597 if (!idev)
2598 continue;
2599 read_lock_bh(&idev->lock);
2600 im = idev->mc_list;
2601 if (im) {
2602 state->idev = idev;
2603 break;
2604 }
2605 read_unlock_bh(&idev->lock);
2606 }
2607 return im;
2608 }
2609
2610 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2611 {
2612 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2613
2614 im = im->next;
2615 while (!im) {
2616 if (likely(state->idev != NULL))
2617 read_unlock_bh(&state->idev->lock);
2618
2619 state->dev = next_net_device_rcu(state->dev);
2620 if (!state->dev) {
2621 state->idev = NULL;
2622 break;
2623 }
2624 state->idev = __in6_dev_get(state->dev);
2625 if (!state->idev)
2626 continue;
2627 read_lock_bh(&state->idev->lock);
2628 im = state->idev->mc_list;
2629 }
2630 return im;
2631 }
2632
2633 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2634 {
2635 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2636 if (im)
2637 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2638 --pos;
2639 return pos ? NULL : im;
2640 }
2641
2642 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2643 __acquires(RCU)
2644 {
2645 rcu_read_lock();
2646 return igmp6_mc_get_idx(seq, *pos);
2647 }
2648
2649 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2650 {
2651 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2652
2653 ++*pos;
2654 return im;
2655 }
2656
2657 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2658 __releases(RCU)
2659 {
2660 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2661
2662 if (likely(state->idev != NULL)) {
2663 read_unlock_bh(&state->idev->lock);
2664 state->idev = NULL;
2665 }
2666 state->dev = NULL;
2667 rcu_read_unlock();
2668 }
2669
2670 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2671 {
2672 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2673 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2674
2675 seq_printf(seq,
2676 "%-4d %-15s %pi6 %5d %08X %ld\n",
2677 state->dev->ifindex, state->dev->name,
2678 &im->mca_addr,
2679 im->mca_users, im->mca_flags,
2680 (im->mca_flags&MAF_TIMER_RUNNING) ?
2681 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2682 return 0;
2683 }
2684
2685 static const struct seq_operations igmp6_mc_seq_ops = {
2686 .start = igmp6_mc_seq_start,
2687 .next = igmp6_mc_seq_next,
2688 .stop = igmp6_mc_seq_stop,
2689 .show = igmp6_mc_seq_show,
2690 };
2691
2692 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2693 {
2694 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2695 sizeof(struct igmp6_mc_iter_state));
2696 }
2697
2698 static const struct file_operations igmp6_mc_seq_fops = {
2699 .owner = THIS_MODULE,
2700 .open = igmp6_mc_seq_open,
2701 .read = seq_read,
2702 .llseek = seq_lseek,
2703 .release = seq_release_net,
2704 };
2705
2706 struct igmp6_mcf_iter_state {
2707 struct seq_net_private p;
2708 struct net_device *dev;
2709 struct inet6_dev *idev;
2710 struct ifmcaddr6 *im;
2711 };
2712
2713 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2714
2715 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2716 {
2717 struct ip6_sf_list *psf = NULL;
2718 struct ifmcaddr6 *im = NULL;
2719 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2720 struct net *net = seq_file_net(seq);
2721
2722 state->idev = NULL;
2723 state->im = NULL;
2724 for_each_netdev_rcu(net, state->dev) {
2725 struct inet6_dev *idev;
2726 idev = __in6_dev_get(state->dev);
2727 if (unlikely(idev == NULL))
2728 continue;
2729 read_lock_bh(&idev->lock);
2730 im = idev->mc_list;
2731 if (likely(im != NULL)) {
2732 spin_lock_bh(&im->mca_lock);
2733 psf = im->mca_sources;
2734 if (likely(psf != NULL)) {
2735 state->im = im;
2736 state->idev = idev;
2737 break;
2738 }
2739 spin_unlock_bh(&im->mca_lock);
2740 }
2741 read_unlock_bh(&idev->lock);
2742 }
2743 return psf;
2744 }
2745
2746 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2747 {
2748 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2749
2750 psf = psf->sf_next;
2751 while (!psf) {
2752 spin_unlock_bh(&state->im->mca_lock);
2753 state->im = state->im->next;
2754 while (!state->im) {
2755 if (likely(state->idev != NULL))
2756 read_unlock_bh(&state->idev->lock);
2757
2758 state->dev = next_net_device_rcu(state->dev);
2759 if (!state->dev) {
2760 state->idev = NULL;
2761 goto out;
2762 }
2763 state->idev = __in6_dev_get(state->dev);
2764 if (!state->idev)
2765 continue;
2766 read_lock_bh(&state->idev->lock);
2767 state->im = state->idev->mc_list;
2768 }
2769 if (!state->im)
2770 break;
2771 spin_lock_bh(&state->im->mca_lock);
2772 psf = state->im->mca_sources;
2773 }
2774 out:
2775 return psf;
2776 }
2777
2778 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2779 {
2780 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2781 if (psf)
2782 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2783 --pos;
2784 return pos ? NULL : psf;
2785 }
2786
2787 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2788 __acquires(RCU)
2789 {
2790 rcu_read_lock();
2791 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2792 }
2793
2794 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2795 {
2796 struct ip6_sf_list *psf;
2797 if (v == SEQ_START_TOKEN)
2798 psf = igmp6_mcf_get_first(seq);
2799 else
2800 psf = igmp6_mcf_get_next(seq, v);
2801 ++*pos;
2802 return psf;
2803 }
2804
2805 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2806 __releases(RCU)
2807 {
2808 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2809 if (likely(state->im != NULL)) {
2810 spin_unlock_bh(&state->im->mca_lock);
2811 state->im = NULL;
2812 }
2813 if (likely(state->idev != NULL)) {
2814 read_unlock_bh(&state->idev->lock);
2815 state->idev = NULL;
2816 }
2817 state->dev = NULL;
2818 rcu_read_unlock();
2819 }
2820
2821 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2822 {
2823 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2824 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2825
2826 if (v == SEQ_START_TOKEN) {
2827 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2828 } else {
2829 seq_printf(seq,
2830 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2831 state->dev->ifindex, state->dev->name,
2832 &state->im->mca_addr,
2833 &psf->sf_addr,
2834 psf->sf_count[MCAST_INCLUDE],
2835 psf->sf_count[MCAST_EXCLUDE]);
2836 }
2837 return 0;
2838 }
2839
2840 static const struct seq_operations igmp6_mcf_seq_ops = {
2841 .start = igmp6_mcf_seq_start,
2842 .next = igmp6_mcf_seq_next,
2843 .stop = igmp6_mcf_seq_stop,
2844 .show = igmp6_mcf_seq_show,
2845 };
2846
2847 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2848 {
2849 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2850 sizeof(struct igmp6_mcf_iter_state));
2851 }
2852
2853 static const struct file_operations igmp6_mcf_seq_fops = {
2854 .owner = THIS_MODULE,
2855 .open = igmp6_mcf_seq_open,
2856 .read = seq_read,
2857 .llseek = seq_lseek,
2858 .release = seq_release_net,
2859 };
2860
2861 static int __net_init igmp6_proc_init(struct net *net)
2862 {
2863 int err;
2864
2865 err = -ENOMEM;
2866 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2867 goto out;
2868 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2869 &igmp6_mcf_seq_fops))
2870 goto out_proc_net_igmp6;
2871
2872 err = 0;
2873 out:
2874 return err;
2875
2876 out_proc_net_igmp6:
2877 remove_proc_entry("igmp6", net->proc_net);
2878 goto out;
2879 }
2880
2881 static void __net_exit igmp6_proc_exit(struct net *net)
2882 {
2883 remove_proc_entry("mcfilter6", net->proc_net);
2884 remove_proc_entry("igmp6", net->proc_net);
2885 }
2886 #else
2887 static inline int igmp6_proc_init(struct net *net)
2888 {
2889 return 0;
2890 }
2891 static inline void igmp6_proc_exit(struct net *net)
2892 {
2893 }
2894 #endif
2895
2896 static int __net_init igmp6_net_init(struct net *net)
2897 {
2898 int err;
2899
2900 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2901 SOCK_RAW, IPPROTO_ICMPV6, net);
2902 if (err < 0) {
2903 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2904 err);
2905 goto out;
2906 }
2907
2908 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2909
2910 err = igmp6_proc_init(net);
2911 if (err)
2912 goto out_sock_create;
2913 out:
2914 return err;
2915
2916 out_sock_create:
2917 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2918 goto out;
2919 }
2920
2921 static void __net_exit igmp6_net_exit(struct net *net)
2922 {
2923 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2924 igmp6_proc_exit(net);
2925 }
2926
2927 static struct pernet_operations igmp6_net_ops = {
2928 .init = igmp6_net_init,
2929 .exit = igmp6_net_exit,
2930 };
2931
2932 int __init igmp6_init(void)
2933 {
2934 return register_pernet_subsys(&igmp6_net_ops);
2935 }
2936
2937 void igmp6_cleanup(void)
2938 {
2939 unregister_pernet_subsys(&igmp6_net_ops);
2940 }
Linux kernel - Deliverables
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