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mm: compaction: abort compaction if too many pages are isolated and caller is asynchr...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv6 / mcast.c
blob76b893771e6e04f618b6d37d273e6c4578d3e053
1 /*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 /* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
38 #include <linux/in.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <net/mld.h>
48
49 #include <linux/netfilter.h>
50 #include <linux/netfilter_ipv6.h>
51
52 #include <net/net_namespace.h>
53 #include <net/sock.h>
54 #include <net/snmp.h>
55
56 #include <net/ipv6.h>
57 #include <net/protocol.h>
58 #include <net/if_inet6.h>
59 #include <net/ndisc.h>
60 #include <net/addrconf.h>
61 #include <net/ip6_route.h>
62 #include <net/inet_common.h>
63
64 #include <net/ip6_checksum.h>
65
66 /* Set to 3 to get tracing... */
67 #define MCAST_DEBUG 2
68
69 #if MCAST_DEBUG >= 3
70 #define MDBG(x) printk x
71 #else
72 #define MDBG(x)
73 #endif
74
75 /* Ensure that we have struct in6_addr aligned on 32bit word. */
76 static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
77 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
80 };
81
82 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
83
84 /* Big mc list lock for all the sockets */
85 static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
86
87 static void igmp6_join_group(struct ifmcaddr6 *ma);
88 static void igmp6_leave_group(struct ifmcaddr6 *ma);
89 static void igmp6_timer_handler(unsigned long data);
90
91 static void mld_gq_timer_expire(unsigned long data);
92 static void mld_ifc_timer_expire(unsigned long data);
93 static void mld_ifc_event(struct inet6_dev *idev);
94 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
95 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
96 static void mld_clear_delrec(struct inet6_dev *idev);
97 static int sf_setstate(struct ifmcaddr6 *pmc);
98 static void sf_markstate(struct ifmcaddr6 *pmc);
99 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
100 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
101 int sfmode, int sfcount, struct in6_addr *psfsrc,
102 int delta);
103 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
104 int sfmode, int sfcount, struct in6_addr *psfsrc,
105 int delta);
106 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107 struct inet6_dev *idev);
108
109
110 #define IGMP6_UNSOLICITED_IVAL (10*HZ)
111 #define MLD_QRV_DEFAULT 2
112
113 #define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
114 (idev)->cnf.force_mld_version == 1 || \
115 ((idev)->mc_v1_seen && \
116 time_before(jiffies, (idev)->mc_v1_seen)))
117
118 #define IPV6_MLD_MAX_MSF 64
119
120 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
121
122 /*
123 * socket join on multicast group
124 */
125
126 #define for_each_pmc_rcu(np, pmc) \
127 for (pmc = rcu_dereference(np->ipv6_mc_list); \
128 pmc != NULL; \
129 pmc = rcu_dereference(pmc->next))
130
131 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
132 {
133 struct net_device *dev = NULL;
134 struct ipv6_mc_socklist *mc_lst;
135 struct ipv6_pinfo *np = inet6_sk(sk);
136 struct net *net = sock_net(sk);
137 int err;
138
139 if (!ipv6_addr_is_multicast(addr))
140 return -EINVAL;
141
142 rcu_read_lock();
143 for_each_pmc_rcu(np, mc_lst) {
144 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145 ipv6_addr_equal(&mc_lst->addr, addr)) {
146 rcu_read_unlock();
147 return -EADDRINUSE;
148 }
149 }
150 rcu_read_unlock();
151
152 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
153
154 if (mc_lst == NULL)
155 return -ENOMEM;
156
157 mc_lst->next = NULL;
158 ipv6_addr_copy(&mc_lst->addr, addr);
159
160 rcu_read_lock();
161 if (ifindex == 0) {
162 struct rt6_info *rt;
163 rt = rt6_lookup(net, addr, NULL, 0, 0);
164 if (rt) {
165 dev = rt->rt6i_dev;
166 dst_release(&rt->dst);
167 }
168 } else
169 dev = dev_get_by_index_rcu(net, ifindex);
170
171 if (dev == NULL) {
172 rcu_read_unlock();
173 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
174 return -ENODEV;
175 }
176
177 mc_lst->ifindex = dev->ifindex;
178 mc_lst->sfmode = MCAST_EXCLUDE;
179 rwlock_init(&mc_lst->sflock);
180 mc_lst->sflist = NULL;
181
182 /*
183 * now add/increase the group membership on the device
184 */
185
186 err = ipv6_dev_mc_inc(dev, addr);
187
188 if (err) {
189 rcu_read_unlock();
190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
191 return err;
192 }
193
194 spin_lock(&ipv6_sk_mc_lock);
195 mc_lst->next = np->ipv6_mc_list;
196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 spin_unlock(&ipv6_sk_mc_lock);
198
199 rcu_read_unlock();
200
201 return 0;
202 }
203
204 static void ipv6_mc_socklist_reclaim(struct rcu_head *head)
205 {
206 kfree(container_of(head, struct ipv6_mc_socklist, rcu));
207 }
208 /*
209 * socket leave on multicast group
210 */
211 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
212 {
213 struct ipv6_pinfo *np = inet6_sk(sk);
214 struct ipv6_mc_socklist *mc_lst;
215 struct ipv6_mc_socklist __rcu **lnk;
216 struct net *net = sock_net(sk);
217
218 spin_lock(&ipv6_sk_mc_lock);
219 for (lnk = &np->ipv6_mc_list;
220 (mc_lst = rcu_dereference_protected(*lnk,
221 lockdep_is_held(&ipv6_sk_mc_lock))) !=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 spin_unlock(&ipv6_sk_mc_lock);
229
230 rcu_read_lock();
231 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
232 if (dev != NULL) {
233 struct inet6_dev *idev = __in6_dev_get(dev);
234
235 (void) ip6_mc_leave_src(sk, mc_lst, idev);
236 if (idev)
237 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
238 } else
239 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
240 rcu_read_unlock();
241 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
242 call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim);
243 return 0;
244 }
245 }
246 spin_unlock(&ipv6_sk_mc_lock);
247
248 return -EADDRNOTAVAIL;
249 }
250
251 /* called with rcu_read_lock() */
252 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
253 struct in6_addr *group,
254 int ifindex)
255 {
256 struct net_device *dev = NULL;
257 struct inet6_dev *idev = NULL;
258
259 if (ifindex == 0) {
260 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
261
262 if (rt) {
263 dev = rt->rt6i_dev;
264 dev_hold(dev);
265 dst_release(&rt->dst);
266 }
267 } else
268 dev = dev_get_by_index_rcu(net, ifindex);
269
270 if (!dev)
271 return NULL;
272 idev = __in6_dev_get(dev);
273 if (!idev)
274 return NULL;
275 read_lock_bh(&idev->lock);
276 if (idev->dead) {
277 read_unlock_bh(&idev->lock);
278 return NULL;
279 }
280 return idev;
281 }
282
283 void ipv6_sock_mc_close(struct sock *sk)
284 {
285 struct ipv6_pinfo *np = inet6_sk(sk);
286 struct ipv6_mc_socklist *mc_lst;
287 struct net *net = sock_net(sk);
288
289 spin_lock(&ipv6_sk_mc_lock);
290 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
291 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
292 struct net_device *dev;
293
294 np->ipv6_mc_list = mc_lst->next;
295 spin_unlock(&ipv6_sk_mc_lock);
296
297 rcu_read_lock();
298 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
299 if (dev) {
300 struct inet6_dev *idev = __in6_dev_get(dev);
301
302 (void) ip6_mc_leave_src(sk, mc_lst, idev);
303 if (idev)
304 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
305 } else
306 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
307 rcu_read_unlock();
308
309 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
310 call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim);
311
312 spin_lock(&ipv6_sk_mc_lock);
313 }
314 spin_unlock(&ipv6_sk_mc_lock);
315 }
316
317 int ip6_mc_source(int add, int omode, struct sock *sk,
318 struct group_source_req *pgsr)
319 {
320 struct in6_addr *source, *group;
321 struct ipv6_mc_socklist *pmc;
322 struct inet6_dev *idev;
323 struct ipv6_pinfo *inet6 = inet6_sk(sk);
324 struct ip6_sf_socklist *psl;
325 struct net *net = sock_net(sk);
326 int i, j, rv;
327 int leavegroup = 0;
328 int pmclocked = 0;
329 int err;
330
331 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
332 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
333
334 if (!ipv6_addr_is_multicast(group))
335 return -EINVAL;
336
337 rcu_read_lock();
338 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
339 if (!idev) {
340 rcu_read_unlock();
341 return -ENODEV;
342 }
343
344 err = -EADDRNOTAVAIL;
345
346 for_each_pmc_rcu(inet6, pmc) {
347 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
348 continue;
349 if (ipv6_addr_equal(&pmc->addr, group))
350 break;
351 }
352 if (!pmc) { /* must have a prior join */
353 err = -EINVAL;
354 goto done;
355 }
356 /* if a source filter was set, must be the same mode as before */
357 if (pmc->sflist) {
358 if (pmc->sfmode != omode) {
359 err = -EINVAL;
360 goto done;
361 }
362 } else if (pmc->sfmode != omode) {
363 /* allow mode switches for empty-set filters */
364 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
365 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
366 pmc->sfmode = omode;
367 }
368
369 write_lock(&pmc->sflock);
370 pmclocked = 1;
371
372 psl = pmc->sflist;
373 if (!add) {
374 if (!psl)
375 goto done; /* err = -EADDRNOTAVAIL */
376 rv = !0;
377 for (i=0; i<psl->sl_count; i++) {
378 rv = memcmp(&psl->sl_addr[i], source,
379 sizeof(struct in6_addr));
380 if (rv == 0)
381 break;
382 }
383 if (rv) /* source not found */
384 goto done; /* err = -EADDRNOTAVAIL */
385
386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
388 leavegroup = 1;
389 goto done;
390 }
391
392 /* update the interface filter */
393 ip6_mc_del_src(idev, group, omode, 1, source, 1);
394
395 for (j=i+1; j<psl->sl_count; j++)
396 psl->sl_addr[j-1] = psl->sl_addr[j];
397 psl->sl_count--;
398 err = 0;
399 goto done;
400 }
401 /* else, add a new source to the filter */
402
403 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
404 err = -ENOBUFS;
405 goto done;
406 }
407 if (!psl || psl->sl_count == psl->sl_max) {
408 struct ip6_sf_socklist *newpsl;
409 int count = IP6_SFBLOCK;
410
411 if (psl)
412 count += psl->sl_max;
413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
414 if (!newpsl) {
415 err = -ENOBUFS;
416 goto done;
417 }
418 newpsl->sl_max = count;
419 newpsl->sl_count = count - IP6_SFBLOCK;
420 if (psl) {
421 for (i=0; i<psl->sl_count; i++)
422 newpsl->sl_addr[i] = psl->sl_addr[i];
423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
424 }
425 pmc->sflist = psl = newpsl;
426 }
427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
428 for (i=0; i<psl->sl_count; i++) {
429 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
430 if (rv == 0)
431 break;
432 }
433 if (rv == 0) /* address already there is an error */
434 goto done;
435 for (j=psl->sl_count-1; j>=i; j--)
436 psl->sl_addr[j+1] = psl->sl_addr[j];
437 psl->sl_addr[i] = *source;
438 psl->sl_count++;
439 err = 0;
440 /* update the interface list */
441 ip6_mc_add_src(idev, group, omode, 1, source, 1);
442 done:
443 if (pmclocked)
444 write_unlock(&pmc->sflock);
445 read_unlock_bh(&idev->lock);
446 rcu_read_unlock();
447 if (leavegroup)
448 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
449 return err;
450 }
451
452 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
453 {
454 struct in6_addr *group;
455 struct ipv6_mc_socklist *pmc;
456 struct inet6_dev *idev;
457 struct ipv6_pinfo *inet6 = inet6_sk(sk);
458 struct ip6_sf_socklist *newpsl, *psl;
459 struct net *net = sock_net(sk);
460 int leavegroup = 0;
461 int i, err;
462
463 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
464
465 if (!ipv6_addr_is_multicast(group))
466 return -EINVAL;
467 if (gsf->gf_fmode != MCAST_INCLUDE &&
468 gsf->gf_fmode != MCAST_EXCLUDE)
469 return -EINVAL;
470
471 rcu_read_lock();
472 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
473
474 if (!idev) {
475 rcu_read_unlock();
476 return -ENODEV;
477 }
478
479 err = 0;
480
481 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
482 leavegroup = 1;
483 goto done;
484 }
485
486 for_each_pmc_rcu(inet6, pmc) {
487 if (pmc->ifindex != gsf->gf_interface)
488 continue;
489 if (ipv6_addr_equal(&pmc->addr, group))
490 break;
491 }
492 if (!pmc) { /* must have a prior join */
493 err = -EINVAL;
494 goto done;
495 }
496 if (gsf->gf_numsrc) {
497 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
498 GFP_ATOMIC);
499 if (!newpsl) {
500 err = -ENOBUFS;
501 goto done;
502 }
503 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
504 for (i=0; i<newpsl->sl_count; ++i) {
505 struct sockaddr_in6 *psin6;
506
507 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
508 newpsl->sl_addr[i] = psin6->sin6_addr;
509 }
510 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
511 newpsl->sl_count, newpsl->sl_addr, 0);
512 if (err) {
513 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
514 goto done;
515 }
516 } else {
517 newpsl = NULL;
518 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
519 }
520
521 write_lock(&pmc->sflock);
522 psl = pmc->sflist;
523 if (psl) {
524 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
525 psl->sl_count, psl->sl_addr, 0);
526 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
527 } else
528 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
529 pmc->sflist = newpsl;
530 pmc->sfmode = gsf->gf_fmode;
531 write_unlock(&pmc->sflock);
532 err = 0;
533 done:
534 read_unlock_bh(&idev->lock);
535 rcu_read_unlock();
536 if (leavegroup)
537 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
538 return err;
539 }
540
541 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
542 struct group_filter __user *optval, int __user *optlen)
543 {
544 int err, i, count, copycount;
545 struct in6_addr *group;
546 struct ipv6_mc_socklist *pmc;
547 struct inet6_dev *idev;
548 struct ipv6_pinfo *inet6 = inet6_sk(sk);
549 struct ip6_sf_socklist *psl;
550 struct net *net = sock_net(sk);
551
552 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
553
554 if (!ipv6_addr_is_multicast(group))
555 return -EINVAL;
556
557 rcu_read_lock();
558 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
559
560 if (!idev) {
561 rcu_read_unlock();
562 return -ENODEV;
563 }
564
565 err = -EADDRNOTAVAIL;
566 /*
567 * changes to the ipv6_mc_list require the socket lock and
568 * a read lock on ip6_sk_mc_lock. We have the socket lock,
569 * so reading the list is safe.
570 */
571
572 for_each_pmc_rcu(inet6, pmc) {
573 if (pmc->ifindex != gsf->gf_interface)
574 continue;
575 if (ipv6_addr_equal(group, &pmc->addr))
576 break;
577 }
578 if (!pmc) /* must have a prior join */
579 goto done;
580 gsf->gf_fmode = pmc->sfmode;
581 psl = pmc->sflist;
582 count = psl ? psl->sl_count : 0;
583 read_unlock_bh(&idev->lock);
584 rcu_read_unlock();
585
586 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
587 gsf->gf_numsrc = count;
588 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
589 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
590 return -EFAULT;
591 }
592 /* changes to psl require the socket lock, a read lock on
593 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
594 * have the socket lock, so reading here is safe.
595 */
596 for (i=0; i<copycount; i++) {
597 struct sockaddr_in6 *psin6;
598 struct sockaddr_storage ss;
599
600 psin6 = (struct sockaddr_in6 *)&ss;
601 memset(&ss, 0, sizeof(ss));
602 psin6->sin6_family = AF_INET6;
603 psin6->sin6_addr = psl->sl_addr[i];
604 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
605 return -EFAULT;
606 }
607 return 0;
608 done:
609 read_unlock_bh(&idev->lock);
610 rcu_read_unlock();
611 return err;
612 }
613
614 int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
615 const struct in6_addr *src_addr)
616 {
617 struct ipv6_pinfo *np = inet6_sk(sk);
618 struct ipv6_mc_socklist *mc;
619 struct ip6_sf_socklist *psl;
620 int rv = 1;
621
622 rcu_read_lock();
623 for_each_pmc_rcu(np, mc) {
624 if (ipv6_addr_equal(&mc->addr, mc_addr))
625 break;
626 }
627 if (!mc) {
628 rcu_read_unlock();
629 return 1;
630 }
631 read_lock(&mc->sflock);
632 psl = mc->sflist;
633 if (!psl) {
634 rv = mc->sfmode == MCAST_EXCLUDE;
635 } else {
636 int i;
637
638 for (i=0; i<psl->sl_count; i++) {
639 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
640 break;
641 }
642 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
643 rv = 0;
644 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
645 rv = 0;
646 }
647 read_unlock(&mc->sflock);
648 rcu_read_unlock();
649
650 return rv;
651 }
652
653 static void ma_put(struct ifmcaddr6 *mc)
654 {
655 if (atomic_dec_and_test(&mc->mca_refcnt)) {
656 in6_dev_put(mc->idev);
657 kfree(mc);
658 }
659 }
660
661 static void igmp6_group_added(struct ifmcaddr6 *mc)
662 {
663 struct net_device *dev = mc->idev->dev;
664 char buf[MAX_ADDR_LEN];
665
666 spin_lock_bh(&mc->mca_lock);
667 if (!(mc->mca_flags&MAF_LOADED)) {
668 mc->mca_flags |= MAF_LOADED;
669 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
670 dev_mc_add(dev, buf);
671 }
672 spin_unlock_bh(&mc->mca_lock);
673
674 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
675 return;
676
677 if (MLD_V1_SEEN(mc->idev)) {
678 igmp6_join_group(mc);
679 return;
680 }
681 /* else v2 */
682
683 mc->mca_crcount = mc->idev->mc_qrv;
684 mld_ifc_event(mc->idev);
685 }
686
687 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
688 {
689 struct net_device *dev = mc->idev->dev;
690 char buf[MAX_ADDR_LEN];
691
692 spin_lock_bh(&mc->mca_lock);
693 if (mc->mca_flags&MAF_LOADED) {
694 mc->mca_flags &= ~MAF_LOADED;
695 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
696 dev_mc_del(dev, buf);
697 }
698
699 if (mc->mca_flags & MAF_NOREPORT)
700 goto done;
701 spin_unlock_bh(&mc->mca_lock);
702
703 if (!mc->idev->dead)
704 igmp6_leave_group(mc);
705
706 spin_lock_bh(&mc->mca_lock);
707 if (del_timer(&mc->mca_timer))
708 atomic_dec(&mc->mca_refcnt);
709 done:
710 ip6_mc_clear_src(mc);
711 spin_unlock_bh(&mc->mca_lock);
712 }
713
714 /*
715 * deleted ifmcaddr6 manipulation
716 */
717 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
718 {
719 struct ifmcaddr6 *pmc;
720
721 /* this is an "ifmcaddr6" for convenience; only the fields below
722 * are actually used. In particular, the refcnt and users are not
723 * used for management of the delete list. Using the same structure
724 * for deleted items allows change reports to use common code with
725 * non-deleted or query-response MCA's.
726 */
727 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
728 if (!pmc)
729 return;
730
731 spin_lock_bh(&im->mca_lock);
732 spin_lock_init(&pmc->mca_lock);
733 pmc->idev = im->idev;
734 in6_dev_hold(idev);
735 pmc->mca_addr = im->mca_addr;
736 pmc->mca_crcount = idev->mc_qrv;
737 pmc->mca_sfmode = im->mca_sfmode;
738 if (pmc->mca_sfmode == MCAST_INCLUDE) {
739 struct ip6_sf_list *psf;
740
741 pmc->mca_tomb = im->mca_tomb;
742 pmc->mca_sources = im->mca_sources;
743 im->mca_tomb = im->mca_sources = NULL;
744 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
745 psf->sf_crcount = pmc->mca_crcount;
746 }
747 spin_unlock_bh(&im->mca_lock);
748
749 spin_lock_bh(&idev->mc_lock);
750 pmc->next = idev->mc_tomb;
751 idev->mc_tomb = pmc;
752 spin_unlock_bh(&idev->mc_lock);
753 }
754
755 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
756 {
757 struct ifmcaddr6 *pmc, *pmc_prev;
758 struct ip6_sf_list *psf, *psf_next;
759
760 spin_lock_bh(&idev->mc_lock);
761 pmc_prev = NULL;
762 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
763 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
764 break;
765 pmc_prev = pmc;
766 }
767 if (pmc) {
768 if (pmc_prev)
769 pmc_prev->next = pmc->next;
770 else
771 idev->mc_tomb = pmc->next;
772 }
773 spin_unlock_bh(&idev->mc_lock);
774
775 if (pmc) {
776 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
777 psf_next = psf->sf_next;
778 kfree(psf);
779 }
780 in6_dev_put(pmc->idev);
781 kfree(pmc);
782 }
783 }
784
785 static void mld_clear_delrec(struct inet6_dev *idev)
786 {
787 struct ifmcaddr6 *pmc, *nextpmc;
788
789 spin_lock_bh(&idev->mc_lock);
790 pmc = idev->mc_tomb;
791 idev->mc_tomb = NULL;
792 spin_unlock_bh(&idev->mc_lock);
793
794 for (; pmc; pmc = nextpmc) {
795 nextpmc = pmc->next;
796 ip6_mc_clear_src(pmc);
797 in6_dev_put(pmc->idev);
798 kfree(pmc);
799 }
800
801 /* clear dead sources, too */
802 read_lock_bh(&idev->lock);
803 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
804 struct ip6_sf_list *psf, *psf_next;
805
806 spin_lock_bh(&pmc->mca_lock);
807 psf = pmc->mca_tomb;
808 pmc->mca_tomb = NULL;
809 spin_unlock_bh(&pmc->mca_lock);
810 for (; psf; psf=psf_next) {
811 psf_next = psf->sf_next;
812 kfree(psf);
813 }
814 }
815 read_unlock_bh(&idev->lock);
816 }
817
818
819 /*
820 * device multicast group inc (add if not found)
821 */
822 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
823 {
824 struct ifmcaddr6 *mc;
825 struct inet6_dev *idev;
826
827 /* we need to take a reference on idev */
828 idev = in6_dev_get(dev);
829
830 if (idev == NULL)
831 return -EINVAL;
832
833 write_lock_bh(&idev->lock);
834 if (idev->dead) {
835 write_unlock_bh(&idev->lock);
836 in6_dev_put(idev);
837 return -ENODEV;
838 }
839
840 for (mc = idev->mc_list; mc; mc = mc->next) {
841 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
842 mc->mca_users++;
843 write_unlock_bh(&idev->lock);
844 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
845 NULL, 0);
846 in6_dev_put(idev);
847 return 0;
848 }
849 }
850
851 /*
852 * not found: create a new one.
853 */
854
855 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
856
857 if (mc == NULL) {
858 write_unlock_bh(&idev->lock);
859 in6_dev_put(idev);
860 return -ENOMEM;
861 }
862
863 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
864
865 ipv6_addr_copy(&mc->mca_addr, addr);
866 mc->idev = idev; /* (reference taken) */
867 mc->mca_users = 1;
868 /* mca_stamp should be updated upon changes */
869 mc->mca_cstamp = mc->mca_tstamp = jiffies;
870 atomic_set(&mc->mca_refcnt, 2);
871 spin_lock_init(&mc->mca_lock);
872
873 /* initial mode is (EX, empty) */
874 mc->mca_sfmode = MCAST_EXCLUDE;
875 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
876
877 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
878 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
879 mc->mca_flags |= MAF_NOREPORT;
880
881 mc->next = idev->mc_list;
882 idev->mc_list = mc;
883 write_unlock_bh(&idev->lock);
884
885 mld_del_delrec(idev, &mc->mca_addr);
886 igmp6_group_added(mc);
887 ma_put(mc);
888 return 0;
889 }
890
891 /*
892 * device multicast group del
893 */
894 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
895 {
896 struct ifmcaddr6 *ma, **map;
897
898 write_lock_bh(&idev->lock);
899 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
900 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
901 if (--ma->mca_users == 0) {
902 *map = ma->next;
903 write_unlock_bh(&idev->lock);
904
905 igmp6_group_dropped(ma);
906
907 ma_put(ma);
908 return 0;
909 }
910 write_unlock_bh(&idev->lock);
911 return 0;
912 }
913 }
914 write_unlock_bh(&idev->lock);
915
916 return -ENOENT;
917 }
918
919 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
920 {
921 struct inet6_dev *idev;
922 int err;
923
924 rcu_read_lock();
925
926 idev = __in6_dev_get(dev);
927 if (!idev)
928 err = -ENODEV;
929 else
930 err = __ipv6_dev_mc_dec(idev, addr);
931
932 rcu_read_unlock();
933 return err;
934 }
935
936 /*
937 * identify MLD packets for MLD filter exceptions
938 */
939 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
940 {
941 struct icmp6hdr *pic;
942
943 if (nexthdr != IPPROTO_ICMPV6)
944 return 0;
945
946 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
947 return 0;
948
949 pic = icmp6_hdr(skb);
950
951 switch (pic->icmp6_type) {
952 case ICMPV6_MGM_QUERY:
953 case ICMPV6_MGM_REPORT:
954 case ICMPV6_MGM_REDUCTION:
955 case ICMPV6_MLD2_REPORT:
956 return 1;
957 default:
958 break;
959 }
960 return 0;
961 }
962
963 /*
964 * check if the interface/address pair is valid
965 */
966 int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
967 const struct in6_addr *src_addr)
968 {
969 struct inet6_dev *idev;
970 struct ifmcaddr6 *mc;
971 int rv = 0;
972
973 rcu_read_lock();
974 idev = __in6_dev_get(dev);
975 if (idev) {
976 read_lock_bh(&idev->lock);
977 for (mc = idev->mc_list; mc; mc=mc->next) {
978 if (ipv6_addr_equal(&mc->mca_addr, group))
979 break;
980 }
981 if (mc) {
982 if (src_addr && !ipv6_addr_any(src_addr)) {
983 struct ip6_sf_list *psf;
984
985 spin_lock_bh(&mc->mca_lock);
986 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
987 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
988 break;
989 }
990 if (psf)
991 rv = psf->sf_count[MCAST_INCLUDE] ||
992 psf->sf_count[MCAST_EXCLUDE] !=
993 mc->mca_sfcount[MCAST_EXCLUDE];
994 else
995 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
996 spin_unlock_bh(&mc->mca_lock);
997 } else
998 rv = 1; /* don't filter unspecified source */
999 }
1000 read_unlock_bh(&idev->lock);
1001 }
1002 rcu_read_unlock();
1003 return rv;
1004 }
1005
1006 static void mld_gq_start_timer(struct inet6_dev *idev)
1007 {
1008 int tv = net_random() % idev->mc_maxdelay;
1009
1010 idev->mc_gq_running = 1;
1011 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1012 in6_dev_hold(idev);
1013 }
1014
1015 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1016 {
1017 int tv = net_random() % delay;
1018
1019 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1020 in6_dev_hold(idev);
1021 }
1022
1023 /*
1024 * IGMP handling (alias multicast ICMPv6 messages)
1025 */
1026
1027 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1028 {
1029 unsigned long delay = resptime;
1030
1031 /* Do not start timer for these addresses */
1032 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1033 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1034 return;
1035
1036 if (del_timer(&ma->mca_timer)) {
1037 atomic_dec(&ma->mca_refcnt);
1038 delay = ma->mca_timer.expires - jiffies;
1039 }
1040
1041 if (delay >= resptime) {
1042 if (resptime)
1043 delay = net_random() % resptime;
1044 else
1045 delay = 1;
1046 }
1047 ma->mca_timer.expires = jiffies + delay;
1048 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1049 atomic_inc(&ma->mca_refcnt);
1050 ma->mca_flags |= MAF_TIMER_RUNNING;
1051 }
1052
1053 /* mark EXCLUDE-mode sources */
1054 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1055 struct in6_addr *srcs)
1056 {
1057 struct ip6_sf_list *psf;
1058 int i, scount;
1059
1060 scount = 0;
1061 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1062 if (scount == nsrcs)
1063 break;
1064 for (i=0; i<nsrcs; i++) {
1065 /* skip inactive filters */
1066 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1067 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1068 psf->sf_count[MCAST_EXCLUDE])
1069 continue;
1070 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1071 scount++;
1072 break;
1073 }
1074 }
1075 }
1076 pmc->mca_flags &= ~MAF_GSQUERY;
1077 if (scount == nsrcs) /* all sources excluded */
1078 return 0;
1079 return 1;
1080 }
1081
1082 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1083 struct in6_addr *srcs)
1084 {
1085 struct ip6_sf_list *psf;
1086 int i, scount;
1087
1088 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1089 return mld_xmarksources(pmc, nsrcs, srcs);
1090
1091 /* mark INCLUDE-mode sources */
1092
1093 scount = 0;
1094 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1095 if (scount == nsrcs)
1096 break;
1097 for (i=0; i<nsrcs; i++) {
1098 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1099 psf->sf_gsresp = 1;
1100 scount++;
1101 break;
1102 }
1103 }
1104 }
1105 if (!scount) {
1106 pmc->mca_flags &= ~MAF_GSQUERY;
1107 return 0;
1108 }
1109 pmc->mca_flags |= MAF_GSQUERY;
1110 return 1;
1111 }
1112
1113 /* called with rcu_read_lock() */
1114 int igmp6_event_query(struct sk_buff *skb)
1115 {
1116 struct mld2_query *mlh2 = NULL;
1117 struct ifmcaddr6 *ma;
1118 struct in6_addr *group;
1119 unsigned long max_delay;
1120 struct inet6_dev *idev;
1121 struct mld_msg *mld;
1122 int group_type;
1123 int mark = 0;
1124 int len;
1125
1126 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1127 return -EINVAL;
1128
1129 /* compute payload length excluding extension headers */
1130 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1131 len -= skb_network_header_len(skb);
1132
1133 /* Drop queries with not link local source */
1134 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1135 return -EINVAL;
1136
1137 idev = __in6_dev_get(skb->dev);
1138
1139 if (idev == NULL)
1140 return 0;
1141
1142 mld = (struct mld_msg *)icmp6_hdr(skb);
1143 group = &mld->mld_mca;
1144 group_type = ipv6_addr_type(group);
1145
1146 if (group_type != IPV6_ADDR_ANY &&
1147 !(group_type&IPV6_ADDR_MULTICAST))
1148 return -EINVAL;
1149
1150 if (len == 24) {
1151 int switchback;
1152 /* MLDv1 router present */
1153
1154 /* Translate milliseconds to jiffies */
1155 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1156
1157 switchback = (idev->mc_qrv + 1) * max_delay;
1158 idev->mc_v1_seen = jiffies + switchback;
1159
1160 /* cancel the interface change timer */
1161 idev->mc_ifc_count = 0;
1162 if (del_timer(&idev->mc_ifc_timer))
1163 __in6_dev_put(idev);
1164 /* clear deleted report items */
1165 mld_clear_delrec(idev);
1166 } else if (len >= 28) {
1167 int srcs_offset = sizeof(struct mld2_query) -
1168 sizeof(struct icmp6hdr);
1169 if (!pskb_may_pull(skb, srcs_offset))
1170 return -EINVAL;
1171
1172 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1173 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1174 if (!max_delay)
1175 max_delay = 1;
1176 idev->mc_maxdelay = max_delay;
1177 if (mlh2->mld2q_qrv)
1178 idev->mc_qrv = mlh2->mld2q_qrv;
1179 if (group_type == IPV6_ADDR_ANY) { /* general query */
1180 if (mlh2->mld2q_nsrcs)
1181 return -EINVAL; /* no sources allowed */
1182
1183 mld_gq_start_timer(idev);
1184 return 0;
1185 }
1186 /* mark sources to include, if group & source-specific */
1187 if (mlh2->mld2q_nsrcs != 0) {
1188 if (!pskb_may_pull(skb, srcs_offset +
1189 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1190 return -EINVAL;
1191
1192 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1193 mark = 1;
1194 }
1195 } else
1196 return -EINVAL;
1197
1198 read_lock_bh(&idev->lock);
1199 if (group_type == IPV6_ADDR_ANY) {
1200 for (ma = idev->mc_list; ma; ma=ma->next) {
1201 spin_lock_bh(&ma->mca_lock);
1202 igmp6_group_queried(ma, max_delay);
1203 spin_unlock_bh(&ma->mca_lock);
1204 }
1205 } else {
1206 for (ma = idev->mc_list; ma; ma=ma->next) {
1207 if (!ipv6_addr_equal(group, &ma->mca_addr))
1208 continue;
1209 spin_lock_bh(&ma->mca_lock);
1210 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1211 /* gsquery <- gsquery && mark */
1212 if (!mark)
1213 ma->mca_flags &= ~MAF_GSQUERY;
1214 } else {
1215 /* gsquery <- mark */
1216 if (mark)
1217 ma->mca_flags |= MAF_GSQUERY;
1218 else
1219 ma->mca_flags &= ~MAF_GSQUERY;
1220 }
1221 if (!(ma->mca_flags & MAF_GSQUERY) ||
1222 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1223 igmp6_group_queried(ma, max_delay);
1224 spin_unlock_bh(&ma->mca_lock);
1225 break;
1226 }
1227 }
1228 read_unlock_bh(&idev->lock);
1229
1230 return 0;
1231 }
1232
1233 /* called with rcu_read_lock() */
1234 int igmp6_event_report(struct sk_buff *skb)
1235 {
1236 struct ifmcaddr6 *ma;
1237 struct inet6_dev *idev;
1238 struct mld_msg *mld;
1239 int addr_type;
1240
1241 /* Our own report looped back. Ignore it. */
1242 if (skb->pkt_type == PACKET_LOOPBACK)
1243 return 0;
1244
1245 /* send our report if the MC router may not have heard this report */
1246 if (skb->pkt_type != PACKET_MULTICAST &&
1247 skb->pkt_type != PACKET_BROADCAST)
1248 return 0;
1249
1250 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1251 return -EINVAL;
1252
1253 mld = (struct mld_msg *)icmp6_hdr(skb);
1254
1255 /* Drop reports with not link local source */
1256 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1257 if (addr_type != IPV6_ADDR_ANY &&
1258 !(addr_type&IPV6_ADDR_LINKLOCAL))
1259 return -EINVAL;
1260
1261 idev = __in6_dev_get(skb->dev);
1262 if (idev == NULL)
1263 return -ENODEV;
1264
1265 /*
1266 * Cancel the timer for this group
1267 */
1268
1269 read_lock_bh(&idev->lock);
1270 for (ma = idev->mc_list; ma; ma=ma->next) {
1271 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1272 spin_lock(&ma->mca_lock);
1273 if (del_timer(&ma->mca_timer))
1274 atomic_dec(&ma->mca_refcnt);
1275 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1276 spin_unlock(&ma->mca_lock);
1277 break;
1278 }
1279 }
1280 read_unlock_bh(&idev->lock);
1281 return 0;
1282 }
1283
1284 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1285 int gdeleted, int sdeleted)
1286 {
1287 switch (type) {
1288 case MLD2_MODE_IS_INCLUDE:
1289 case MLD2_MODE_IS_EXCLUDE:
1290 if (gdeleted || sdeleted)
1291 return 0;
1292 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1293 if (pmc->mca_sfmode == MCAST_INCLUDE)
1294 return 1;
1295 /* don't include if this source is excluded
1296 * in all filters
1297 */
1298 if (psf->sf_count[MCAST_INCLUDE])
1299 return type == MLD2_MODE_IS_INCLUDE;
1300 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1301 psf->sf_count[MCAST_EXCLUDE];
1302 }
1303 return 0;
1304 case MLD2_CHANGE_TO_INCLUDE:
1305 if (gdeleted || sdeleted)
1306 return 0;
1307 return psf->sf_count[MCAST_INCLUDE] != 0;
1308 case MLD2_CHANGE_TO_EXCLUDE:
1309 if (gdeleted || sdeleted)
1310 return 0;
1311 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1312 psf->sf_count[MCAST_INCLUDE])
1313 return 0;
1314 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1315 psf->sf_count[MCAST_EXCLUDE];
1316 case MLD2_ALLOW_NEW_SOURCES:
1317 if (gdeleted || !psf->sf_crcount)
1318 return 0;
1319 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1320 case MLD2_BLOCK_OLD_SOURCES:
1321 if (pmc->mca_sfmode == MCAST_INCLUDE)
1322 return gdeleted || (psf->sf_crcount && sdeleted);
1323 return psf->sf_crcount && !gdeleted && !sdeleted;
1324 }
1325 return 0;
1326 }
1327
1328 static int
1329 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1330 {
1331 struct ip6_sf_list *psf;
1332 int scount = 0;
1333
1334 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1335 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1336 continue;
1337 scount++;
1338 }
1339 return scount;
1340 }
1341
1342 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1343 {
1344 struct net *net = dev_net(dev);
1345 struct sock *sk = net->ipv6.igmp_sk;
1346 struct sk_buff *skb;
1347 struct mld2_report *pmr;
1348 struct in6_addr addr_buf;
1349 const struct in6_addr *saddr;
1350 int err;
1351 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1352 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1353 IPV6_TLV_PADN, 0 };
1354
1355 /* we assume size > sizeof(ra) here */
1356 size += LL_ALLOCATED_SPACE(dev);
1357 /* limit our allocations to order-0 page */
1358 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1359 skb = sock_alloc_send_skb(sk, size, 1, &err);
1360
1361 if (!skb)
1362 return NULL;
1363
1364 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1365
1366 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1367 /* <draft-ietf-magma-mld-source-05.txt>:
1368 * use unspecified address as the source address
1369 * when a valid link-local address is not available.
1370 */
1371 saddr = &in6addr_any;
1372 } else
1373 saddr = &addr_buf;
1374
1375 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1376
1377 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1378
1379 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1380 skb_put(skb, sizeof(*pmr));
1381 pmr = (struct mld2_report *)skb_transport_header(skb);
1382 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1383 pmr->mld2r_resv1 = 0;
1384 pmr->mld2r_cksum = 0;
1385 pmr->mld2r_resv2 = 0;
1386 pmr->mld2r_ngrec = 0;
1387 return skb;
1388 }
1389
1390 static void mld_sendpack(struct sk_buff *skb)
1391 {
1392 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1393 struct mld2_report *pmr =
1394 (struct mld2_report *)skb_transport_header(skb);
1395 int payload_len, mldlen;
1396 struct inet6_dev *idev;
1397 struct net *net = dev_net(skb->dev);
1398 int err;
1399 struct flowi6 fl6;
1400 struct dst_entry *dst;
1401
1402 rcu_read_lock();
1403 idev = __in6_dev_get(skb->dev);
1404 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1405
1406 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1407 mldlen = skb->tail - skb->transport_header;
1408 pip6->payload_len = htons(payload_len);
1409
1410 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1411 IPPROTO_ICMPV6,
1412 csum_partial(skb_transport_header(skb),
1413 mldlen, 0));
1414
1415 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1416
1417 if (!dst) {
1418 err = -ENOMEM;
1419 goto err_out;
1420 }
1421
1422 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1423 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1424 skb->dev->ifindex);
1425
1426 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1427 err = 0;
1428 if (IS_ERR(dst)) {
1429 err = PTR_ERR(dst);
1430 dst = NULL;
1431 }
1432 skb_dst_set(skb, dst);
1433 if (err)
1434 goto err_out;
1435
1436 payload_len = skb->len;
1437
1438 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1439 dst_output);
1440 out:
1441 if (!err) {
1442 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1443 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1444 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1445 } else
1446 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1447
1448 rcu_read_unlock();
1449 return;
1450
1451 err_out:
1452 kfree_skb(skb);
1453 goto out;
1454 }
1455
1456 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1457 {
1458 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1459 }
1460
1461 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1462 int type, struct mld2_grec **ppgr)
1463 {
1464 struct net_device *dev = pmc->idev->dev;
1465 struct mld2_report *pmr;
1466 struct mld2_grec *pgr;
1467
1468 if (!skb)
1469 skb = mld_newpack(dev, dev->mtu);
1470 if (!skb)
1471 return NULL;
1472 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1473 pgr->grec_type = type;
1474 pgr->grec_auxwords = 0;
1475 pgr->grec_nsrcs = 0;
1476 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1477 pmr = (struct mld2_report *)skb_transport_header(skb);
1478 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1479 *ppgr = pgr;
1480 return skb;
1481 }
1482
1483 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1484 skb_tailroom(skb)) : 0)
1485
1486 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1487 int type, int gdeleted, int sdeleted)
1488 {
1489 struct net_device *dev = pmc->idev->dev;
1490 struct mld2_report *pmr;
1491 struct mld2_grec *pgr = NULL;
1492 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1493 int scount, stotal, first, isquery, truncate;
1494
1495 if (pmc->mca_flags & MAF_NOREPORT)
1496 return skb;
1497
1498 isquery = type == MLD2_MODE_IS_INCLUDE ||
1499 type == MLD2_MODE_IS_EXCLUDE;
1500 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1501 type == MLD2_CHANGE_TO_EXCLUDE;
1502
1503 stotal = scount = 0;
1504
1505 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1506
1507 if (!*psf_list)
1508 goto empty_source;
1509
1510 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1511
1512 /* EX and TO_EX get a fresh packet, if needed */
1513 if (truncate) {
1514 if (pmr && pmr->mld2r_ngrec &&
1515 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1516 if (skb)
1517 mld_sendpack(skb);
1518 skb = mld_newpack(dev, dev->mtu);
1519 }
1520 }
1521 first = 1;
1522 psf_prev = NULL;
1523 for (psf=*psf_list; psf; psf=psf_next) {
1524 struct in6_addr *psrc;
1525
1526 psf_next = psf->sf_next;
1527
1528 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1529 psf_prev = psf;
1530 continue;
1531 }
1532
1533 /* clear marks on query responses */
1534 if (isquery)
1535 psf->sf_gsresp = 0;
1536
1537 if (AVAILABLE(skb) < sizeof(*psrc) +
1538 first*sizeof(struct mld2_grec)) {
1539 if (truncate && !first)
1540 break; /* truncate these */
1541 if (pgr)
1542 pgr->grec_nsrcs = htons(scount);
1543 if (skb)
1544 mld_sendpack(skb);
1545 skb = mld_newpack(dev, dev->mtu);
1546 first = 1;
1547 scount = 0;
1548 }
1549 if (first) {
1550 skb = add_grhead(skb, pmc, type, &pgr);
1551 first = 0;
1552 }
1553 if (!skb)
1554 return NULL;
1555 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1556 *psrc = psf->sf_addr;
1557 scount++; stotal++;
1558 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1559 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1560 psf->sf_crcount--;
1561 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1562 if (psf_prev)
1563 psf_prev->sf_next = psf->sf_next;
1564 else
1565 *psf_list = psf->sf_next;
1566 kfree(psf);
1567 continue;
1568 }
1569 }
1570 psf_prev = psf;
1571 }
1572
1573 empty_source:
1574 if (!stotal) {
1575 if (type == MLD2_ALLOW_NEW_SOURCES ||
1576 type == MLD2_BLOCK_OLD_SOURCES)
1577 return skb;
1578 if (pmc->mca_crcount || isquery) {
1579 /* make sure we have room for group header */
1580 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1581 mld_sendpack(skb);
1582 skb = NULL; /* add_grhead will get a new one */
1583 }
1584 skb = add_grhead(skb, pmc, type, &pgr);
1585 }
1586 }
1587 if (pgr)
1588 pgr->grec_nsrcs = htons(scount);
1589
1590 if (isquery)
1591 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1592 return skb;
1593 }
1594
1595 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1596 {
1597 struct sk_buff *skb = NULL;
1598 int type;
1599
1600 if (!pmc) {
1601 read_lock_bh(&idev->lock);
1602 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1603 if (pmc->mca_flags & MAF_NOREPORT)
1604 continue;
1605 spin_lock_bh(&pmc->mca_lock);
1606 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1607 type = MLD2_MODE_IS_EXCLUDE;
1608 else
1609 type = MLD2_MODE_IS_INCLUDE;
1610 skb = add_grec(skb, pmc, type, 0, 0);
1611 spin_unlock_bh(&pmc->mca_lock);
1612 }
1613 read_unlock_bh(&idev->lock);
1614 } else {
1615 spin_lock_bh(&pmc->mca_lock);
1616 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1617 type = MLD2_MODE_IS_EXCLUDE;
1618 else
1619 type = MLD2_MODE_IS_INCLUDE;
1620 skb = add_grec(skb, pmc, type, 0, 0);
1621 spin_unlock_bh(&pmc->mca_lock);
1622 }
1623 if (skb)
1624 mld_sendpack(skb);
1625 }
1626
1627 /*
1628 * remove zero-count source records from a source filter list
1629 */
1630 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1631 {
1632 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1633
1634 psf_prev = NULL;
1635 for (psf=*ppsf; psf; psf = psf_next) {
1636 psf_next = psf->sf_next;
1637 if (psf->sf_crcount == 0) {
1638 if (psf_prev)
1639 psf_prev->sf_next = psf->sf_next;
1640 else
1641 *ppsf = psf->sf_next;
1642 kfree(psf);
1643 } else
1644 psf_prev = psf;
1645 }
1646 }
1647
1648 static void mld_send_cr(struct inet6_dev *idev)
1649 {
1650 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1651 struct sk_buff *skb = NULL;
1652 int type, dtype;
1653
1654 read_lock_bh(&idev->lock);
1655 spin_lock(&idev->mc_lock);
1656
1657 /* deleted MCA's */
1658 pmc_prev = NULL;
1659 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1660 pmc_next = pmc->next;
1661 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1662 type = MLD2_BLOCK_OLD_SOURCES;
1663 dtype = MLD2_BLOCK_OLD_SOURCES;
1664 skb = add_grec(skb, pmc, type, 1, 0);
1665 skb = add_grec(skb, pmc, dtype, 1, 1);
1666 }
1667 if (pmc->mca_crcount) {
1668 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1669 type = MLD2_CHANGE_TO_INCLUDE;
1670 skb = add_grec(skb, pmc, type, 1, 0);
1671 }
1672 pmc->mca_crcount--;
1673 if (pmc->mca_crcount == 0) {
1674 mld_clear_zeros(&pmc->mca_tomb);
1675 mld_clear_zeros(&pmc->mca_sources);
1676 }
1677 }
1678 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1679 !pmc->mca_sources) {
1680 if (pmc_prev)
1681 pmc_prev->next = pmc_next;
1682 else
1683 idev->mc_tomb = pmc_next;
1684 in6_dev_put(pmc->idev);
1685 kfree(pmc);
1686 } else
1687 pmc_prev = pmc;
1688 }
1689 spin_unlock(&idev->mc_lock);
1690
1691 /* change recs */
1692 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1693 spin_lock_bh(&pmc->mca_lock);
1694 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1695 type = MLD2_BLOCK_OLD_SOURCES;
1696 dtype = MLD2_ALLOW_NEW_SOURCES;
1697 } else {
1698 type = MLD2_ALLOW_NEW_SOURCES;
1699 dtype = MLD2_BLOCK_OLD_SOURCES;
1700 }
1701 skb = add_grec(skb, pmc, type, 0, 0);
1702 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1703
1704 /* filter mode changes */
1705 if (pmc->mca_crcount) {
1706 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1707 type = MLD2_CHANGE_TO_EXCLUDE;
1708 else
1709 type = MLD2_CHANGE_TO_INCLUDE;
1710 skb = add_grec(skb, pmc, type, 0, 0);
1711 pmc->mca_crcount--;
1712 }
1713 spin_unlock_bh(&pmc->mca_lock);
1714 }
1715 read_unlock_bh(&idev->lock);
1716 if (!skb)
1717 return;
1718 (void) mld_sendpack(skb);
1719 }
1720
1721 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1722 {
1723 struct net *net = dev_net(dev);
1724 struct sock *sk = net->ipv6.igmp_sk;
1725 struct inet6_dev *idev;
1726 struct sk_buff *skb;
1727 struct mld_msg *hdr;
1728 const struct in6_addr *snd_addr, *saddr;
1729 struct in6_addr addr_buf;
1730 int err, len, payload_len, full_len;
1731 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1732 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1733 IPV6_TLV_PADN, 0 };
1734 struct flowi6 fl6;
1735 struct dst_entry *dst;
1736
1737 if (type == ICMPV6_MGM_REDUCTION)
1738 snd_addr = &in6addr_linklocal_allrouters;
1739 else
1740 snd_addr = addr;
1741
1742 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1743 payload_len = len + sizeof(ra);
1744 full_len = sizeof(struct ipv6hdr) + payload_len;
1745
1746 rcu_read_lock();
1747 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1748 IPSTATS_MIB_OUT, full_len);
1749 rcu_read_unlock();
1750
1751 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1752
1753 if (skb == NULL) {
1754 rcu_read_lock();
1755 IP6_INC_STATS(net, __in6_dev_get(dev),
1756 IPSTATS_MIB_OUTDISCARDS);
1757 rcu_read_unlock();
1758 return;
1759 }
1760
1761 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1762
1763 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1764 /* <draft-ietf-magma-mld-source-05.txt>:
1765 * use unspecified address as the source address
1766 * when a valid link-local address is not available.
1767 */
1768 saddr = &in6addr_any;
1769 } else
1770 saddr = &addr_buf;
1771
1772 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1773
1774 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1775
1776 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1777 memset(hdr, 0, sizeof(struct mld_msg));
1778 hdr->mld_type = type;
1779 ipv6_addr_copy(&hdr->mld_mca, addr);
1780
1781 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1782 IPPROTO_ICMPV6,
1783 csum_partial(hdr, len, 0));
1784
1785 rcu_read_lock();
1786 idev = __in6_dev_get(skb->dev);
1787
1788 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1789 if (!dst) {
1790 err = -ENOMEM;
1791 goto err_out;
1792 }
1793
1794 icmpv6_flow_init(sk, &fl6, type,
1795 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1796 skb->dev->ifindex);
1797
1798 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1799 if (IS_ERR(dst)) {
1800 err = PTR_ERR(dst);
1801 goto err_out;
1802 }
1803
1804 skb_dst_set(skb, dst);
1805 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1806 dst_output);
1807 out:
1808 if (!err) {
1809 ICMP6MSGOUT_INC_STATS(net, idev, type);
1810 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1811 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1812 } else
1813 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1814
1815 rcu_read_unlock();
1816 return;
1817
1818 err_out:
1819 kfree_skb(skb);
1820 goto out;
1821 }
1822
1823 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1824 struct in6_addr *psfsrc)
1825 {
1826 struct ip6_sf_list *psf, *psf_prev;
1827 int rv = 0;
1828
1829 psf_prev = NULL;
1830 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1831 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1832 break;
1833 psf_prev = psf;
1834 }
1835 if (!psf || psf->sf_count[sfmode] == 0) {
1836 /* source filter not found, or count wrong => bug */
1837 return -ESRCH;
1838 }
1839 psf->sf_count[sfmode]--;
1840 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1841 struct inet6_dev *idev = pmc->idev;
1842
1843 /* no more filters for this source */
1844 if (psf_prev)
1845 psf_prev->sf_next = psf->sf_next;
1846 else
1847 pmc->mca_sources = psf->sf_next;
1848 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1849 !MLD_V1_SEEN(idev)) {
1850 psf->sf_crcount = idev->mc_qrv;
1851 psf->sf_next = pmc->mca_tomb;
1852 pmc->mca_tomb = psf;
1853 rv = 1;
1854 } else
1855 kfree(psf);
1856 }
1857 return rv;
1858 }
1859
1860 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1861 int sfmode, int sfcount, struct in6_addr *psfsrc,
1862 int delta)
1863 {
1864 struct ifmcaddr6 *pmc;
1865 int changerec = 0;
1866 int i, err;
1867
1868 if (!idev)
1869 return -ENODEV;
1870 read_lock_bh(&idev->lock);
1871 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1872 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1873 break;
1874 }
1875 if (!pmc) {
1876 /* MCA not found?? bug */
1877 read_unlock_bh(&idev->lock);
1878 return -ESRCH;
1879 }
1880 spin_lock_bh(&pmc->mca_lock);
1881 sf_markstate(pmc);
1882 if (!delta) {
1883 if (!pmc->mca_sfcount[sfmode]) {
1884 spin_unlock_bh(&pmc->mca_lock);
1885 read_unlock_bh(&idev->lock);
1886 return -EINVAL;
1887 }
1888 pmc->mca_sfcount[sfmode]--;
1889 }
1890 err = 0;
1891 for (i=0; i<sfcount; i++) {
1892 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1893
1894 changerec |= rv > 0;
1895 if (!err && rv < 0)
1896 err = rv;
1897 }
1898 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1899 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1900 pmc->mca_sfcount[MCAST_INCLUDE]) {
1901 struct ip6_sf_list *psf;
1902
1903 /* filter mode change */
1904 pmc->mca_sfmode = MCAST_INCLUDE;
1905 pmc->mca_crcount = idev->mc_qrv;
1906 idev->mc_ifc_count = pmc->mca_crcount;
1907 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1908 psf->sf_crcount = 0;
1909 mld_ifc_event(pmc->idev);
1910 } else if (sf_setstate(pmc) || changerec)
1911 mld_ifc_event(pmc->idev);
1912 spin_unlock_bh(&pmc->mca_lock);
1913 read_unlock_bh(&idev->lock);
1914 return err;
1915 }
1916
1917 /*
1918 * Add multicast single-source filter to the interface list
1919 */
1920 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1921 struct in6_addr *psfsrc, int delta)
1922 {
1923 struct ip6_sf_list *psf, *psf_prev;
1924
1925 psf_prev = NULL;
1926 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1927 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1928 break;
1929 psf_prev = psf;
1930 }
1931 if (!psf) {
1932 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1933 if (!psf)
1934 return -ENOBUFS;
1935
1936 psf->sf_addr = *psfsrc;
1937 if (psf_prev) {
1938 psf_prev->sf_next = psf;
1939 } else
1940 pmc->mca_sources = psf;
1941 }
1942 psf->sf_count[sfmode]++;
1943 return 0;
1944 }
1945
1946 static void sf_markstate(struct ifmcaddr6 *pmc)
1947 {
1948 struct ip6_sf_list *psf;
1949 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1950
1951 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1952 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1953 psf->sf_oldin = mca_xcount ==
1954 psf->sf_count[MCAST_EXCLUDE] &&
1955 !psf->sf_count[MCAST_INCLUDE];
1956 } else
1957 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1958 }
1959
1960 static int sf_setstate(struct ifmcaddr6 *pmc)
1961 {
1962 struct ip6_sf_list *psf, *dpsf;
1963 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1964 int qrv = pmc->idev->mc_qrv;
1965 int new_in, rv;
1966
1967 rv = 0;
1968 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1969 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1970 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1971 !psf->sf_count[MCAST_INCLUDE];
1972 } else
1973 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1974 if (new_in) {
1975 if (!psf->sf_oldin) {
1976 struct ip6_sf_list *prev = NULL;
1977
1978 for (dpsf=pmc->mca_tomb; dpsf;
1979 dpsf=dpsf->sf_next) {
1980 if (ipv6_addr_equal(&dpsf->sf_addr,
1981 &psf->sf_addr))
1982 break;
1983 prev = dpsf;
1984 }
1985 if (dpsf) {
1986 if (prev)
1987 prev->sf_next = dpsf->sf_next;
1988 else
1989 pmc->mca_tomb = dpsf->sf_next;
1990 kfree(dpsf);
1991 }
1992 psf->sf_crcount = qrv;
1993 rv++;
1994 }
1995 } else if (psf->sf_oldin) {
1996 psf->sf_crcount = 0;
1997 /*
1998 * add or update "delete" records if an active filter
1999 * is now inactive
2000 */
2001 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2002 if (ipv6_addr_equal(&dpsf->sf_addr,
2003 &psf->sf_addr))
2004 break;
2005 if (!dpsf) {
2006 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2007 if (!dpsf)
2008 continue;
2009 *dpsf = *psf;
2010 /* pmc->mca_lock held by callers */
2011 dpsf->sf_next = pmc->mca_tomb;
2012 pmc->mca_tomb = dpsf;
2013 }
2014 dpsf->sf_crcount = qrv;
2015 rv++;
2016 }
2017 }
2018 return rv;
2019 }
2020
2021 /*
2022 * Add multicast source filter list to the interface list
2023 */
2024 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2025 int sfmode, int sfcount, struct in6_addr *psfsrc,
2026 int delta)
2027 {
2028 struct ifmcaddr6 *pmc;
2029 int isexclude;
2030 int i, err;
2031
2032 if (!idev)
2033 return -ENODEV;
2034 read_lock_bh(&idev->lock);
2035 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2036 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2037 break;
2038 }
2039 if (!pmc) {
2040 /* MCA not found?? bug */
2041 read_unlock_bh(&idev->lock);
2042 return -ESRCH;
2043 }
2044 spin_lock_bh(&pmc->mca_lock);
2045
2046 sf_markstate(pmc);
2047 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2048 if (!delta)
2049 pmc->mca_sfcount[sfmode]++;
2050 err = 0;
2051 for (i=0; i<sfcount; i++) {
2052 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2053 if (err)
2054 break;
2055 }
2056 if (err) {
2057 int j;
2058
2059 if (!delta)
2060 pmc->mca_sfcount[sfmode]--;
2061 for (j=0; j<i; j++)
2062 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2063 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2064 struct ip6_sf_list *psf;
2065
2066 /* filter mode change */
2067 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2068 pmc->mca_sfmode = MCAST_EXCLUDE;
2069 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2070 pmc->mca_sfmode = MCAST_INCLUDE;
2071 /* else no filters; keep old mode for reports */
2072
2073 pmc->mca_crcount = idev->mc_qrv;
2074 idev->mc_ifc_count = pmc->mca_crcount;
2075 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2076 psf->sf_crcount = 0;
2077 mld_ifc_event(idev);
2078 } else if (sf_setstate(pmc))
2079 mld_ifc_event(idev);
2080 spin_unlock_bh(&pmc->mca_lock);
2081 read_unlock_bh(&idev->lock);
2082 return err;
2083 }
2084
2085 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2086 {
2087 struct ip6_sf_list *psf, *nextpsf;
2088
2089 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2090 nextpsf = psf->sf_next;
2091 kfree(psf);
2092 }
2093 pmc->mca_tomb = NULL;
2094 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2095 nextpsf = psf->sf_next;
2096 kfree(psf);
2097 }
2098 pmc->mca_sources = NULL;
2099 pmc->mca_sfmode = MCAST_EXCLUDE;
2100 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2101 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2102 }
2103
2104
2105 static void igmp6_join_group(struct ifmcaddr6 *ma)
2106 {
2107 unsigned long delay;
2108
2109 if (ma->mca_flags & MAF_NOREPORT)
2110 return;
2111
2112 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2113
2114 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2115
2116 spin_lock_bh(&ma->mca_lock);
2117 if (del_timer(&ma->mca_timer)) {
2118 atomic_dec(&ma->mca_refcnt);
2119 delay = ma->mca_timer.expires - jiffies;
2120 }
2121
2122 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2123 atomic_inc(&ma->mca_refcnt);
2124 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2125 spin_unlock_bh(&ma->mca_lock);
2126 }
2127
2128 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2129 struct inet6_dev *idev)
2130 {
2131 int err;
2132
2133 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2134 * so no other readers or writers of iml or its sflist
2135 */
2136 if (!iml->sflist) {
2137 /* any-source empty exclude case */
2138 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2139 }
2140 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2141 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2142 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2143 iml->sflist = NULL;
2144 return err;
2145 }
2146
2147 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2148 {
2149 if (MLD_V1_SEEN(ma->idev)) {
2150 if (ma->mca_flags & MAF_LAST_REPORTER)
2151 igmp6_send(&ma->mca_addr, ma->idev->dev,
2152 ICMPV6_MGM_REDUCTION);
2153 } else {
2154 mld_add_delrec(ma->idev, ma);
2155 mld_ifc_event(ma->idev);
2156 }
2157 }
2158
2159 static void mld_gq_timer_expire(unsigned long data)
2160 {
2161 struct inet6_dev *idev = (struct inet6_dev *)data;
2162
2163 idev->mc_gq_running = 0;
2164 mld_send_report(idev, NULL);
2165 __in6_dev_put(idev);
2166 }
2167
2168 static void mld_ifc_timer_expire(unsigned long data)
2169 {
2170 struct inet6_dev *idev = (struct inet6_dev *)data;
2171
2172 mld_send_cr(idev);
2173 if (idev->mc_ifc_count) {
2174 idev->mc_ifc_count--;
2175 if (idev->mc_ifc_count)
2176 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2177 }
2178 __in6_dev_put(idev);
2179 }
2180
2181 static void mld_ifc_event(struct inet6_dev *idev)
2182 {
2183 if (MLD_V1_SEEN(idev))
2184 return;
2185 idev->mc_ifc_count = idev->mc_qrv;
2186 mld_ifc_start_timer(idev, 1);
2187 }
2188
2189
2190 static void igmp6_timer_handler(unsigned long data)
2191 {
2192 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2193
2194 if (MLD_V1_SEEN(ma->idev))
2195 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2196 else
2197 mld_send_report(ma->idev, ma);
2198
2199 spin_lock(&ma->mca_lock);
2200 ma->mca_flags |= MAF_LAST_REPORTER;
2201 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2202 spin_unlock(&ma->mca_lock);
2203 ma_put(ma);
2204 }
2205
2206 /* Device changing type */
2207
2208 void ipv6_mc_unmap(struct inet6_dev *idev)
2209 {
2210 struct ifmcaddr6 *i;
2211
2212 /* Install multicast list, except for all-nodes (already installed) */
2213
2214 read_lock_bh(&idev->lock);
2215 for (i = idev->mc_list; i; i = i->next)
2216 igmp6_group_dropped(i);
2217 read_unlock_bh(&idev->lock);
2218 }
2219
2220 void ipv6_mc_remap(struct inet6_dev *idev)
2221 {
2222 ipv6_mc_up(idev);
2223 }
2224
2225 /* Device going down */
2226
2227 void ipv6_mc_down(struct inet6_dev *idev)
2228 {
2229 struct ifmcaddr6 *i;
2230
2231 /* Withdraw multicast list */
2232
2233 read_lock_bh(&idev->lock);
2234 idev->mc_ifc_count = 0;
2235 if (del_timer(&idev->mc_ifc_timer))
2236 __in6_dev_put(idev);
2237 idev->mc_gq_running = 0;
2238 if (del_timer(&idev->mc_gq_timer))
2239 __in6_dev_put(idev);
2240
2241 for (i = idev->mc_list; i; i=i->next)
2242 igmp6_group_dropped(i);
2243 read_unlock_bh(&idev->lock);
2244
2245 mld_clear_delrec(idev);
2246 }
2247
2248
2249 /* Device going up */
2250
2251 void ipv6_mc_up(struct inet6_dev *idev)
2252 {
2253 struct ifmcaddr6 *i;
2254
2255 /* Install multicast list, except for all-nodes (already installed) */
2256
2257 read_lock_bh(&idev->lock);
2258 for (i = idev->mc_list; i; i=i->next)
2259 igmp6_group_added(i);
2260 read_unlock_bh(&idev->lock);
2261 }
2262
2263 /* IPv6 device initialization. */
2264
2265 void ipv6_mc_init_dev(struct inet6_dev *idev)
2266 {
2267 write_lock_bh(&idev->lock);
2268 spin_lock_init(&idev->mc_lock);
2269 idev->mc_gq_running = 0;
2270 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2271 (unsigned long)idev);
2272 idev->mc_tomb = NULL;
2273 idev->mc_ifc_count = 0;
2274 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2275 (unsigned long)idev);
2276 idev->mc_qrv = MLD_QRV_DEFAULT;
2277 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2278 idev->mc_v1_seen = 0;
2279 write_unlock_bh(&idev->lock);
2280 }
2281
2282 /*
2283 * Device is about to be destroyed: clean up.
2284 */
2285
2286 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2287 {
2288 struct ifmcaddr6 *i;
2289
2290 /* Deactivate timers */
2291 ipv6_mc_down(idev);
2292
2293 /* Delete all-nodes address. */
2294 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2295 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2296 * fail.
2297 */
2298 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2299
2300 if (idev->cnf.forwarding)
2301 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2302
2303 write_lock_bh(&idev->lock);
2304 while ((i = idev->mc_list) != NULL) {
2305 idev->mc_list = i->next;
2306 write_unlock_bh(&idev->lock);
2307
2308 igmp6_group_dropped(i);
2309 ma_put(i);
2310
2311 write_lock_bh(&idev->lock);
2312 }
2313 write_unlock_bh(&idev->lock);
2314 }
2315
2316 #ifdef CONFIG_PROC_FS
2317 struct igmp6_mc_iter_state {
2318 struct seq_net_private p;
2319 struct net_device *dev;
2320 struct inet6_dev *idev;
2321 };
2322
2323 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2324
2325 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2326 {
2327 struct ifmcaddr6 *im = NULL;
2328 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2329 struct net *net = seq_file_net(seq);
2330
2331 state->idev = NULL;
2332 for_each_netdev_rcu(net, state->dev) {
2333 struct inet6_dev *idev;
2334 idev = __in6_dev_get(state->dev);
2335 if (!idev)
2336 continue;
2337 read_lock_bh(&idev->lock);
2338 im = idev->mc_list;
2339 if (im) {
2340 state->idev = idev;
2341 break;
2342 }
2343 read_unlock_bh(&idev->lock);
2344 }
2345 return im;
2346 }
2347
2348 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2349 {
2350 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2351
2352 im = im->next;
2353 while (!im) {
2354 if (likely(state->idev != NULL))
2355 read_unlock_bh(&state->idev->lock);
2356
2357 state->dev = next_net_device_rcu(state->dev);
2358 if (!state->dev) {
2359 state->idev = NULL;
2360 break;
2361 }
2362 state->idev = __in6_dev_get(state->dev);
2363 if (!state->idev)
2364 continue;
2365 read_lock_bh(&state->idev->lock);
2366 im = state->idev->mc_list;
2367 }
2368 return im;
2369 }
2370
2371 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2372 {
2373 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2374 if (im)
2375 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2376 --pos;
2377 return pos ? NULL : im;
2378 }
2379
2380 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2381 __acquires(RCU)
2382 {
2383 rcu_read_lock();
2384 return igmp6_mc_get_idx(seq, *pos);
2385 }
2386
2387 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2388 {
2389 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2390
2391 ++*pos;
2392 return im;
2393 }
2394
2395 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2396 __releases(RCU)
2397 {
2398 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2399
2400 if (likely(state->idev != NULL)) {
2401 read_unlock_bh(&state->idev->lock);
2402 state->idev = NULL;
2403 }
2404 state->dev = NULL;
2405 rcu_read_unlock();
2406 }
2407
2408 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2409 {
2410 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2411 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2412
2413 seq_printf(seq,
2414 "%-4d %-15s %pi6 %5d %08X %ld\n",
2415 state->dev->ifindex, state->dev->name,
2416 &im->mca_addr,
2417 im->mca_users, im->mca_flags,
2418 (im->mca_flags&MAF_TIMER_RUNNING) ?
2419 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2420 return 0;
2421 }
2422
2423 static const struct seq_operations igmp6_mc_seq_ops = {
2424 .start = igmp6_mc_seq_start,
2425 .next = igmp6_mc_seq_next,
2426 .stop = igmp6_mc_seq_stop,
2427 .show = igmp6_mc_seq_show,
2428 };
2429
2430 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2431 {
2432 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2433 sizeof(struct igmp6_mc_iter_state));
2434 }
2435
2436 static const struct file_operations igmp6_mc_seq_fops = {
2437 .owner = THIS_MODULE,
2438 .open = igmp6_mc_seq_open,
2439 .read = seq_read,
2440 .llseek = seq_lseek,
2441 .release = seq_release_net,
2442 };
2443
2444 struct igmp6_mcf_iter_state {
2445 struct seq_net_private p;
2446 struct net_device *dev;
2447 struct inet6_dev *idev;
2448 struct ifmcaddr6 *im;
2449 };
2450
2451 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2452
2453 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2454 {
2455 struct ip6_sf_list *psf = NULL;
2456 struct ifmcaddr6 *im = NULL;
2457 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2458 struct net *net = seq_file_net(seq);
2459
2460 state->idev = NULL;
2461 state->im = NULL;
2462 for_each_netdev_rcu(net, state->dev) {
2463 struct inet6_dev *idev;
2464 idev = __in6_dev_get(state->dev);
2465 if (unlikely(idev == NULL))
2466 continue;
2467 read_lock_bh(&idev->lock);
2468 im = idev->mc_list;
2469 if (likely(im != NULL)) {
2470 spin_lock_bh(&im->mca_lock);
2471 psf = im->mca_sources;
2472 if (likely(psf != NULL)) {
2473 state->im = im;
2474 state->idev = idev;
2475 break;
2476 }
2477 spin_unlock_bh(&im->mca_lock);
2478 }
2479 read_unlock_bh(&idev->lock);
2480 }
2481 return psf;
2482 }
2483
2484 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2485 {
2486 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2487
2488 psf = psf->sf_next;
2489 while (!psf) {
2490 spin_unlock_bh(&state->im->mca_lock);
2491 state->im = state->im->next;
2492 while (!state->im) {
2493 if (likely(state->idev != NULL))
2494 read_unlock_bh(&state->idev->lock);
2495
2496 state->dev = next_net_device_rcu(state->dev);
2497 if (!state->dev) {
2498 state->idev = NULL;
2499 goto out;
2500 }
2501 state->idev = __in6_dev_get(state->dev);
2502 if (!state->idev)
2503 continue;
2504 read_lock_bh(&state->idev->lock);
2505 state->im = state->idev->mc_list;
2506 }
2507 if (!state->im)
2508 break;
2509 spin_lock_bh(&state->im->mca_lock);
2510 psf = state->im->mca_sources;
2511 }
2512 out:
2513 return psf;
2514 }
2515
2516 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2517 {
2518 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2519 if (psf)
2520 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2521 --pos;
2522 return pos ? NULL : psf;
2523 }
2524
2525 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2526 __acquires(RCU)
2527 {
2528 rcu_read_lock();
2529 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2530 }
2531
2532 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2533 {
2534 struct ip6_sf_list *psf;
2535 if (v == SEQ_START_TOKEN)
2536 psf = igmp6_mcf_get_first(seq);
2537 else
2538 psf = igmp6_mcf_get_next(seq, v);
2539 ++*pos;
2540 return psf;
2541 }
2542
2543 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2544 __releases(RCU)
2545 {
2546 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2547 if (likely(state->im != NULL)) {
2548 spin_unlock_bh(&state->im->mca_lock);
2549 state->im = NULL;
2550 }
2551 if (likely(state->idev != NULL)) {
2552 read_unlock_bh(&state->idev->lock);
2553 state->idev = NULL;
2554 }
2555 state->dev = NULL;
2556 rcu_read_unlock();
2557 }
2558
2559 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2560 {
2561 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2562 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2563
2564 if (v == SEQ_START_TOKEN) {
2565 seq_printf(seq,
2566 "%3s %6s "
2567 "%32s %32s %6s %6s\n", "Idx",
2568 "Device", "Multicast Address",
2569 "Source Address", "INC", "EXC");
2570 } else {
2571 seq_printf(seq,
2572 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2573 state->dev->ifindex, state->dev->name,
2574 &state->im->mca_addr,
2575 &psf->sf_addr,
2576 psf->sf_count[MCAST_INCLUDE],
2577 psf->sf_count[MCAST_EXCLUDE]);
2578 }
2579 return 0;
2580 }
2581
2582 static const struct seq_operations igmp6_mcf_seq_ops = {
2583 .start = igmp6_mcf_seq_start,
2584 .next = igmp6_mcf_seq_next,
2585 .stop = igmp6_mcf_seq_stop,
2586 .show = igmp6_mcf_seq_show,
2587 };
2588
2589 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2590 {
2591 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2592 sizeof(struct igmp6_mcf_iter_state));
2593 }
2594
2595 static const struct file_operations igmp6_mcf_seq_fops = {
2596 .owner = THIS_MODULE,
2597 .open = igmp6_mcf_seq_open,
2598 .read = seq_read,
2599 .llseek = seq_lseek,
2600 .release = seq_release_net,
2601 };
2602
2603 static int __net_init igmp6_proc_init(struct net *net)
2604 {
2605 int err;
2606
2607 err = -ENOMEM;
2608 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2609 goto out;
2610 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2611 &igmp6_mcf_seq_fops))
2612 goto out_proc_net_igmp6;
2613
2614 err = 0;
2615 out:
2616 return err;
2617
2618 out_proc_net_igmp6:
2619 proc_net_remove(net, "igmp6");
2620 goto out;
2621 }
2622
2623 static void __net_exit igmp6_proc_exit(struct net *net)
2624 {
2625 proc_net_remove(net, "mcfilter6");
2626 proc_net_remove(net, "igmp6");
2627 }
2628 #else
2629 static inline int igmp6_proc_init(struct net *net)
2630 {
2631 return 0;
2632 }
2633 static inline void igmp6_proc_exit(struct net *net)
2634 {
2635 }
2636 #endif
2637
2638 static int __net_init igmp6_net_init(struct net *net)
2639 {
2640 int err;
2641
2642 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2643 SOCK_RAW, IPPROTO_ICMPV6, net);
2644 if (err < 0) {
2645 printk(KERN_ERR
2646 "Failed to initialize the IGMP6 control socket (err %d).\n",
2647 err);
2648 goto out;
2649 }
2650
2651 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2652
2653 err = igmp6_proc_init(net);
2654 if (err)
2655 goto out_sock_create;
2656 out:
2657 return err;
2658
2659 out_sock_create:
2660 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2661 goto out;
2662 }
2663
2664 static void __net_exit igmp6_net_exit(struct net *net)
2665 {
2666 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2667 igmp6_proc_exit(net);
2668 }
2669
2670 static struct pernet_operations igmp6_net_ops = {
2671 .init = igmp6_net_init,
2672 .exit = igmp6_net_exit,
2673 };
2674
2675 int __init igmp6_init(void)
2676 {
2677 return register_pernet_subsys(&igmp6_net_ops);
2678 }
2679
2680 void igmp6_cleanup(void)
2681 {
2682 unregister_pernet_subsys(&igmp6_net_ops);
2683 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree