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ipv6: mcast: RCU conversion
[net-next-2.6.git] / net / ipv6 / mcast.c
CommitLineData
1da177e4
LT		 1/*
2 * Multicast support for IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1ab1457c 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
1da177e4
LT		 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
1da177e4
LT		 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>
5a0e3ad6 46#include <linux/slab.h>
6e7cb837 47#include <net/mld.h>
1da177e4
LT		 48
49#include <linux/netfilter.h>
50#include <linux/netfilter_ipv6.h>
51
457c4cbc 52#include <net/net_namespace.h>
1da177e4
LT		 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>
1ed8516f 62#include <net/inet_common.h>
1da177e4
LT		 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
6e7cb837
YH		 75/* Ensure that we have struct in6_addr aligned on 32bit word. */
76static 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)
1da177e4
LT		 80};
81
82static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
83
84/* Big mc list lock for all the sockets */
456b61bc 85static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
1da177e4 86
1da177e4
LT		 87static void igmp6_join_group(struct ifmcaddr6 *ma);
88static void igmp6_leave_group(struct ifmcaddr6 *ma);
89static void igmp6_timer_handler(unsigned long data);
90
91static void mld_gq_timer_expire(unsigned long data);
92static void mld_ifc_timer_expire(unsigned long data);
93static void mld_ifc_event(struct inet6_dev *idev);
94static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
95static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
96static void mld_clear_delrec(struct inet6_dev *idev);
97static int sf_setstate(struct ifmcaddr6 *pmc);
98static void sf_markstate(struct ifmcaddr6 *pmc);
99static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
100static 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);
103static 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);
106static 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
53b7997f 113#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
1da177e4
LT		 114 (idev)->cnf.force_mld_version == 1 || \
115 ((idev)->mc_v1_seen && \
116 time_before(jiffies, (idev)->mc_v1_seen)))
117
6f4353d8 118#define IPV6_MLD_MAX_MSF 64
1da177e4 119
ab32ea5d 120int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 121
122/*
123 * socket join on multicast group
124 */
125
456b61bc
ED		 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
9acd9f3a 131int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 132{
133 struct net_device *dev = NULL;
134 struct ipv6_mc_socklist *mc_lst;
135 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 136 struct net *net = sock_net(sk);
1da177e4
LT		 137 int err;
138
139 if (!ipv6_addr_is_multicast(addr))
140 return -EINVAL;
141
456b61bc
ED		 142 rcu_read_lock();
143 for_each_pmc_rcu(np, mc_lst) {
c9e3e8b6
DS		 144 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
145 ipv6_addr_equal(&mc_lst->addr, addr)) {
456b61bc 146 rcu_read_unlock();
c9e3e8b6
DS		 147 return -EADDRINUSE;
148 }
149 }
456b61bc 150 rcu_read_unlock();
c9e3e8b6 151
1da177e4
LT		 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
96b52e61 160 rcu_read_lock();
1da177e4
LT		 161 if (ifindex == 0) {
162 struct rt6_info *rt;
b8ad0cbc 163 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4
LT		 164 if (rt) {
165 dev = rt->rt6i_dev;
d8d1f30b 166 dst_release(&rt->dst);
1da177e4
LT		 167 }
168 } else
96b52e61 169 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 170
171 if (dev == NULL) {
96b52e61 172 rcu_read_unlock();
1da177e4
LT		 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;
196433c5 179 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 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) {
96b52e61 189 rcu_read_unlock();
1da177e4 190 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
1da177e4
LT		 191 return err;
192 }
193
456b61bc 194 spin_lock(&ipv6_sk_mc_lock);
1da177e4 195 mc_lst->next = np->ipv6_mc_list;
456b61bc
ED		 196 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
197 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 198
96b52e61 199 rcu_read_unlock();
1da177e4
LT		 200
201 return 0;
202}
203
456b61bc
ED		 204static void ipv6_mc_socklist_reclaim(struct rcu_head *head)
205{
206 kfree(container_of(head, struct ipv6_mc_socklist, rcu));
207}
1da177e4
LT		 208/*
209 * socket leave on multicast group
210 */
9acd9f3a 211int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 212{
213 struct ipv6_pinfo *np = inet6_sk(sk);
456b61bc
ED		 214 struct ipv6_mc_socklist *mc_lst;
215 struct ipv6_mc_socklist __rcu **lnk;
3b1e0a65 216 struct net *net = sock_net(sk);
1da177e4 217
456b61bc
ED		 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) {
1da177e4
LT		 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;
456b61bc 228 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 229
96b52e61
ED		 230 rcu_read_lock();
231 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
b8ad0cbc 232 if (dev != NULL) {
96b52e61 233 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 234
acd6e00b 235 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 236 if (idev)
1da177e4 237 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 238 } else
239 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
96b52e61 240 rcu_read_unlock();
456b61bc
ED		 241 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
242 call_rcu(&mc_lst->rcu, ipv6_mc_socklist_reclaim);
1da177e4
LT		 243 return 0;
244 }
245 }
456b61bc 246 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 247
9951f036 248 return -EADDRNOTAVAIL;
1da177e4
LT		 249}
250
96b52e61
ED		 251/* called with rcu_read_lock() */
252static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
253 struct in6_addr *group,
254 int ifindex)
1da177e4
LT		 255{
256 struct net_device *dev = NULL;
257 struct inet6_dev *idev = NULL;
258
259 if (ifindex == 0) {
96b52e61 260 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4 261
1da177e4
LT		 262 if (rt) {
263 dev = rt->rt6i_dev;
264 dev_hold(dev);
d8d1f30b 265 dst_release(&rt->dst);
1da177e4
LT		 266 }
267 } else
96b52e61 268 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 269
270 if (!dev)
96b52e61
ED		 271 return NULL;
272 idev = __in6_dev_get(dev);
448eb71f 273 if (!idev)
8a22c99a 274 return NULL;
1da177e4 275 read_lock_bh(&idev->lock);
96b52e61
ED		 276 if (idev->dead) {
277 read_unlock_bh(&idev->lock);
278 return NULL;
279 }
1da177e4
LT		 280 return idev;
281}
282
283void ipv6_sock_mc_close(struct sock *sk)
284{
285 struct ipv6_pinfo *np = inet6_sk(sk);
286 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 287 struct net *net = sock_net(sk);
1da177e4 288
456b61bc
ED		 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) {
1da177e4
LT		 292 struct net_device *dev;
293
294 np->ipv6_mc_list = mc_lst->next;
456b61bc 295 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 296
96b52e61
ED		 297 rcu_read_lock();
298 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
1da177e4 299 if (dev) {
96b52e61 300 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 301
acd6e00b 302 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 303 if (idev)
1da177e4 304 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 305 } else
306 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
96b52e61 307 rcu_read_unlock();
1da177e4 308
456b61bc
ED		 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);
1da177e4 313 }
456b61bc 314 spin_unlock(&ipv6_sk_mc_lock);
1da177e4
LT		 315}
316
317int 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 net_device *dev;
323 struct inet6_dev *idev;
324 struct ipv6_pinfo *inet6 = inet6_sk(sk);
325 struct ip6_sf_socklist *psl;
3b1e0a65 326 struct net *net = sock_net(sk);
1da177e4 327 int i, j, rv;
c9e3e8b6 328 int leavegroup = 0;
5ab4a6c8 329 int pmclocked = 0;
1da177e4
LT		 330 int err;
331
1da177e4
LT		 332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
334
335 if (!ipv6_addr_is_multicast(group))
336 return -EINVAL;
337
96b52e61
ED		 338 rcu_read_lock();
339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
340 if (!idev) {
341 rcu_read_unlock();
1da177e4 342 return -ENODEV;
96b52e61 343 }
1da177e4
LT		 344 dev = idev->dev;
345
346 err = -EADDRNOTAVAIL;
347
456b61bc 348 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 349 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
350 continue;
351 if (ipv6_addr_equal(&pmc->addr, group))
352 break;
353 }
917f2f10
DS		 354 if (!pmc) { /* must have a prior join */
355 err = -EINVAL;
1da177e4 356 goto done;
917f2f10 357 }
1da177e4
LT		 358 /* if a source filter was set, must be the same mode as before */
359 if (pmc->sflist) {
917f2f10
DS		 360 if (pmc->sfmode != omode) {
361 err = -EINVAL;
1da177e4 362 goto done;
917f2f10 363 }
1da177e4
LT		 364 } else if (pmc->sfmode != omode) {
365 /* allow mode switches for empty-set filters */
366 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
367 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
368 pmc->sfmode = omode;
369 }
370
96b52e61 371 write_lock(&pmc->sflock);
5ab4a6c8
DS		 372 pmclocked = 1;
373
1da177e4
LT		 374 psl = pmc->sflist;
375 if (!add) {
376 if (!psl)
917f2f10 377 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 378 rv = !0;
379 for (i=0; i<psl->sl_count; i++) {
380 rv = memcmp(&psl->sl_addr[i], source,
381 sizeof(struct in6_addr));
382 if (rv == 0)
383 break;
384 }
385 if (rv) /* source not found */
917f2f10 386 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 387
c9e3e8b6
DS		 388 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
389 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
390 leavegroup = 1;
391 goto done;
392 }
393
1da177e4
LT		 394 /* update the interface filter */
395 ip6_mc_del_src(idev, group, omode, 1, source, 1);
396
397 for (j=i+1; j<psl->sl_count; j++)
398 psl->sl_addr[j-1] = psl->sl_addr[j];
399 psl->sl_count--;
400 err = 0;
401 goto done;
402 }
403 /* else, add a new source to the filter */
404
405 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
406 err = -ENOBUFS;
407 goto done;
408 }
409 if (!psl || psl->sl_count == psl->sl_max) {
410 struct ip6_sf_socklist *newpsl;
411 int count = IP6_SFBLOCK;
412
413 if (psl)
414 count += psl->sl_max;
8b3a7005 415 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 416 if (!newpsl) {
417 err = -ENOBUFS;
418 goto done;
419 }
420 newpsl->sl_max = count;
421 newpsl->sl_count = count - IP6_SFBLOCK;
422 if (psl) {
423 for (i=0; i<psl->sl_count; i++)
424 newpsl->sl_addr[i] = psl->sl_addr[i];
425 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
426 }
427 pmc->sflist = psl = newpsl;
428 }
429 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
430 for (i=0; i<psl->sl_count; i++) {
431 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
432 if (rv == 0)
433 break;
434 }
435 if (rv == 0) /* address already there is an error */
436 goto done;
437 for (j=psl->sl_count-1; j>=i; j--)
438 psl->sl_addr[j+1] = psl->sl_addr[j];
439 psl->sl_addr[i] = *source;
440 psl->sl_count++;
441 err = 0;
442 /* update the interface list */
443 ip6_mc_add_src(idev, group, omode, 1, source, 1);
444done:
5ab4a6c8 445 if (pmclocked)
96b52e61 446 write_unlock(&pmc->sflock);
1da177e4 447 read_unlock_bh(&idev->lock);
96b52e61 448 rcu_read_unlock();
c9e3e8b6
DS		 449 if (leavegroup)
450 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 451 return err;
452}
453
454int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
455{
456 struct in6_addr *group;
457 struct ipv6_mc_socklist *pmc;
458 struct net_device *dev;
459 struct inet6_dev *idev;
460 struct ipv6_pinfo *inet6 = inet6_sk(sk);
461 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 462 struct net *net = sock_net(sk);
9951f036 463 int leavegroup = 0;
1da177e4
LT		 464 int i, err;
465
466 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
467
468 if (!ipv6_addr_is_multicast(group))
469 return -EINVAL;
470 if (gsf->gf_fmode != MCAST_INCLUDE &&
471 gsf->gf_fmode != MCAST_EXCLUDE)
472 return -EINVAL;
473
96b52e61
ED		 474 rcu_read_lock();
475 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 476
96b52e61
ED		 477 if (!idev) {
478 rcu_read_unlock();
1da177e4 479 return -ENODEV;
96b52e61 480 }
1da177e4 481 dev = idev->dev;
1da177e4 482
9c05989b 483 err = 0;
5ab4a6c8 484
9951f036
DS		 485 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
486 leavegroup = 1;
487 goto done;
488 }
489
456b61bc 490 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 491 if (pmc->ifindex != gsf->gf_interface)
492 continue;
493 if (ipv6_addr_equal(&pmc->addr, group))
494 break;
495 }
917f2f10
DS		 496 if (!pmc) { /* must have a prior join */
497 err = -EINVAL;
1da177e4 498 goto done;
917f2f10 499 }
1da177e4 500 if (gsf->gf_numsrc) {
8b3a7005
KK		 501 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
502 GFP_ATOMIC);
1da177e4
LT		 503 if (!newpsl) {
504 err = -ENOBUFS;
505 goto done;
506 }
507 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
508 for (i=0; i<newpsl->sl_count; ++i) {
509 struct sockaddr_in6 *psin6;
510
511 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
512 newpsl->sl_addr[i] = psin6->sin6_addr;
513 }
514 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
515 newpsl->sl_count, newpsl->sl_addr, 0);
516 if (err) {
517 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
518 goto done;
519 }
8713dbf0 520 } else {
1da177e4 521 newpsl = NULL;
8713dbf0
YZ		 522 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
523 }
5ab4a6c8 524
96b52e61 525 write_lock(&pmc->sflock);
1da177e4
LT		 526 psl = pmc->sflist;
527 if (psl) {
528 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
529 psl->sl_count, psl->sl_addr, 0);
530 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
531 } else
532 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
533 pmc->sflist = newpsl;
534 pmc->sfmode = gsf->gf_fmode;
96b52e61 535 write_unlock(&pmc->sflock);
917f2f10 536 err = 0;
1da177e4
LT		 537done:
538 read_unlock_bh(&idev->lock);
96b52e61 539 rcu_read_unlock();
9951f036
DS		 540 if (leavegroup)
541 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 542 return err;
543}
544
545int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
546 struct group_filter __user *optval, int __user *optlen)
547{
548 int err, i, count, copycount;
549 struct in6_addr *group;
550 struct ipv6_mc_socklist *pmc;
551 struct inet6_dev *idev;
552 struct net_device *dev;
553 struct ipv6_pinfo *inet6 = inet6_sk(sk);
554 struct ip6_sf_socklist *psl;
3b1e0a65 555 struct net *net = sock_net(sk);
1da177e4
LT		 556
557 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
558
559 if (!ipv6_addr_is_multicast(group))
560 return -EINVAL;
561
96b52e61
ED		 562 rcu_read_lock();
563 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 564
96b52e61
ED		 565 if (!idev) {
566 rcu_read_unlock();
1da177e4 567 return -ENODEV;
96b52e61 568 }
1da177e4
LT		 569 dev = idev->dev;
570
571 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 572 /*
573 * changes to the ipv6_mc_list require the socket lock and
574 * a read lock on ip6_sk_mc_lock. We have the socket lock,
575 * so reading the list is safe.
576 */
1da177e4 577
456b61bc 578 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 579 if (pmc->ifindex != gsf->gf_interface)
580 continue;
581 if (ipv6_addr_equal(group, &pmc->addr))
582 break;
583 }
584 if (!pmc) /* must have a prior join */
585 goto done;
586 gsf->gf_fmode = pmc->sfmode;
587 psl = pmc->sflist;
588 count = psl ? psl->sl_count : 0;
589 read_unlock_bh(&idev->lock);
96b52e61 590 rcu_read_unlock();
1da177e4
LT		 591
592 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
593 gsf->gf_numsrc = count;
594 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
595 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
596 return -EFAULT;
597 }
5ab4a6c8
DS		 598 /* changes to psl require the socket lock, a read lock on
599 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
600 * have the socket lock, so reading here is safe.
601 */
1da177e4
LT		 602 for (i=0; i<copycount; i++) {
603 struct sockaddr_in6 *psin6;
604 struct sockaddr_storage ss;
605
606 psin6 = (struct sockaddr_in6 *)&ss;
607 memset(&ss, 0, sizeof(ss));
608 psin6->sin6_family = AF_INET6;
609 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 610 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 611 return -EFAULT;
612 }
613 return 0;
614done:
615 read_unlock_bh(&idev->lock);
96b52e61 616 rcu_read_unlock();
1da177e4
LT		 617 return err;
618}
619
9acd9f3a
YH		 620int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
621 const struct in6_addr *src_addr)
1da177e4
LT		 622{
623 struct ipv6_pinfo *np = inet6_sk(sk);
624 struct ipv6_mc_socklist *mc;
625 struct ip6_sf_socklist *psl;
626 int rv = 1;
627
456b61bc
ED		 628 rcu_read_lock();
629 for_each_pmc_rcu(np, mc) {
1da177e4
LT		 630 if (ipv6_addr_equal(&mc->addr, mc_addr))
631 break;
632 }
633 if (!mc) {
456b61bc 634 rcu_read_unlock();
1da177e4
LT		 635 return 1;
636 }
5ab4a6c8 637 read_lock(&mc->sflock);
1da177e4
LT		 638 psl = mc->sflist;
639 if (!psl) {
640 rv = mc->sfmode == MCAST_EXCLUDE;
641 } else {
642 int i;
643
644 for (i=0; i<psl->sl_count; i++) {
645 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
646 break;
647 }
648 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
649 rv = 0;
650 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
651 rv = 0;
652 }
5ab4a6c8 653 read_unlock(&mc->sflock);
456b61bc 654 rcu_read_unlock();
1da177e4
LT		 655
656 return rv;
657}
658
659static void ma_put(struct ifmcaddr6 *mc)
660{
661 if (atomic_dec_and_test(&mc->mca_refcnt)) {
662 in6_dev_put(mc->idev);
663 kfree(mc);
664 }
665}
666
667static void igmp6_group_added(struct ifmcaddr6 *mc)
668{
669 struct net_device *dev = mc->idev->dev;
670 char buf[MAX_ADDR_LEN];
671
672 spin_lock_bh(&mc->mca_lock);
673 if (!(mc->mca_flags&MAF_LOADED)) {
674 mc->mca_flags |= MAF_LOADED;
675 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 676 dev_mc_add(dev, buf);
1da177e4
LT		 677 }
678 spin_unlock_bh(&mc->mca_lock);
679
680 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
681 return;
682
683 if (MLD_V1_SEEN(mc->idev)) {
684 igmp6_join_group(mc);
685 return;
686 }
687 /* else v2 */
688
689 mc->mca_crcount = mc->idev->mc_qrv;
690 mld_ifc_event(mc->idev);
691}
692
693static void igmp6_group_dropped(struct ifmcaddr6 *mc)
694{
695 struct net_device *dev = mc->idev->dev;
696 char buf[MAX_ADDR_LEN];
697
698 spin_lock_bh(&mc->mca_lock);
699 if (mc->mca_flags&MAF_LOADED) {
700 mc->mca_flags &= ~MAF_LOADED;
701 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 702 dev_mc_del(dev, buf);
1da177e4
LT		 703 }
704
705 if (mc->mca_flags & MAF_NOREPORT)
706 goto done;
707 spin_unlock_bh(&mc->mca_lock);
708
709 if (!mc->idev->dead)
710 igmp6_leave_group(mc);
711
712 spin_lock_bh(&mc->mca_lock);
713 if (del_timer(&mc->mca_timer))
714 atomic_dec(&mc->mca_refcnt);
715done:
716 ip6_mc_clear_src(mc);
717 spin_unlock_bh(&mc->mca_lock);
718}
719
720/*
721 * deleted ifmcaddr6 manipulation
722 */
723static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
724{
725 struct ifmcaddr6 *pmc;
726
727 /* this is an "ifmcaddr6" for convenience; only the fields below
728 * are actually used. In particular, the refcnt and users are not
729 * used for management of the delete list. Using the same structure
730 * for deleted items allows change reports to use common code with
731 * non-deleted or query-response MCA's.
732 */
0c600eda 733 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 734 if (!pmc)
735 return;
0c600eda 736
1da177e4
LT		 737 spin_lock_bh(&im->mca_lock);
738 spin_lock_init(&pmc->mca_lock);
739 pmc->idev = im->idev;
740 in6_dev_hold(idev);
741 pmc->mca_addr = im->mca_addr;
742 pmc->mca_crcount = idev->mc_qrv;
743 pmc->mca_sfmode = im->mca_sfmode;
744 if (pmc->mca_sfmode == MCAST_INCLUDE) {
745 struct ip6_sf_list *psf;
746
747 pmc->mca_tomb = im->mca_tomb;
748 pmc->mca_sources = im->mca_sources;
749 im->mca_tomb = im->mca_sources = NULL;
750 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
751 psf->sf_crcount = pmc->mca_crcount;
752 }
753 spin_unlock_bh(&im->mca_lock);
754
6457d26b 755 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 756 pmc->next = idev->mc_tomb;
757 idev->mc_tomb = pmc;
6457d26b 758 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 759}
760
761static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
762{
763 struct ifmcaddr6 *pmc, *pmc_prev;
764 struct ip6_sf_list *psf, *psf_next;
765
6457d26b 766 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 767 pmc_prev = NULL;
768 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
769 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
770 break;
771 pmc_prev = pmc;
772 }
773 if (pmc) {
774 if (pmc_prev)
775 pmc_prev->next = pmc->next;
776 else
777 idev->mc_tomb = pmc->next;
778 }
6457d26b
SH		 779 spin_unlock_bh(&idev->mc_lock);
780
1da177e4
LT		 781 if (pmc) {
782 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
783 psf_next = psf->sf_next;
784 kfree(psf);
785 }
786 in6_dev_put(pmc->idev);
787 kfree(pmc);
788 }
789}
790
791static void mld_clear_delrec(struct inet6_dev *idev)
792{
793 struct ifmcaddr6 *pmc, *nextpmc;
794
6457d26b 795 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 796 pmc = idev->mc_tomb;
797 idev->mc_tomb = NULL;
6457d26b 798 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 799
800 for (; pmc; pmc = nextpmc) {
801 nextpmc = pmc->next;
802 ip6_mc_clear_src(pmc);
803 in6_dev_put(pmc->idev);
804 kfree(pmc);
805 }
806
807 /* clear dead sources, too */
808 read_lock_bh(&idev->lock);
809 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
810 struct ip6_sf_list *psf, *psf_next;
811
812 spin_lock_bh(&pmc->mca_lock);
813 psf = pmc->mca_tomb;
814 pmc->mca_tomb = NULL;
815 spin_unlock_bh(&pmc->mca_lock);
816 for (; psf; psf=psf_next) {
817 psf_next = psf->sf_next;
818 kfree(psf);
819 }
820 }
821 read_unlock_bh(&idev->lock);
822}
823
824
825/*
826 * device multicast group inc (add if not found)
827 */
9acd9f3a 828int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 829{
830 struct ifmcaddr6 *mc;
831 struct inet6_dev *idev;
832
96b52e61 833 /* we need to take a reference on idev */
1da177e4
LT		 834 idev = in6_dev_get(dev);
835
836 if (idev == NULL)
837 return -EINVAL;
838
839 write_lock_bh(&idev->lock);
840 if (idev->dead) {
841 write_unlock_bh(&idev->lock);
842 in6_dev_put(idev);
843 return -ENODEV;
844 }
845
846 for (mc = idev->mc_list; mc; mc = mc->next) {
847 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
848 mc->mca_users++;
849 write_unlock_bh(&idev->lock);
850 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
851 NULL, 0);
852 in6_dev_put(idev);
853 return 0;
854 }
855 }
856
857 /*
858 * not found: create a new one.
859 */
860
0c600eda 861 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 862
863 if (mc == NULL) {
864 write_unlock_bh(&idev->lock);
865 in6_dev_put(idev);
866 return -ENOMEM;
867 }
868
b24b8a24 869 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4
LT		 870
871 ipv6_addr_copy(&mc->mca_addr, addr);
96b52e61 872 mc->idev = idev; /* (reference taken) */
1da177e4
LT		 873 mc->mca_users = 1;
874 /* mca_stamp should be updated upon changes */
875 mc->mca_cstamp = mc->mca_tstamp = jiffies;
876 atomic_set(&mc->mca_refcnt, 2);
877 spin_lock_init(&mc->mca_lock);
878
879 /* initial mode is (EX, empty) */
880 mc->mca_sfmode = MCAST_EXCLUDE;
881 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
882
883 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
884 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
885 mc->mca_flags |= MAF_NOREPORT;
886
887 mc->next = idev->mc_list;
888 idev->mc_list = mc;
889 write_unlock_bh(&idev->lock);
890
891 mld_del_delrec(idev, &mc->mca_addr);
892 igmp6_group_added(mc);
893 ma_put(mc);
894 return 0;
895}
896
897/*
898 * device multicast group del
899 */
9acd9f3a 900int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 901{
902 struct ifmcaddr6 *ma, **map;
903
904 write_lock_bh(&idev->lock);
905 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
906 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
907 if (--ma->mca_users == 0) {
908 *map = ma->next;
909 write_unlock_bh(&idev->lock);
910
911 igmp6_group_dropped(ma);
912
913 ma_put(ma);
914 return 0;
915 }
916 write_unlock_bh(&idev->lock);
917 return 0;
918 }
919 }
920 write_unlock_bh(&idev->lock);
921
922 return -ENOENT;
923}
924
9acd9f3a 925int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4 926{
96b52e61 927 struct inet6_dev *idev;
1da177e4
LT		 928 int err;
929
96b52e61 930 rcu_read_lock();
1da177e4 931
96b52e61
ED		 932 idev = __in6_dev_get(dev);
933 if (!idev)
934 err = -ENODEV;
935 else
936 err = __ipv6_dev_mc_dec(idev, addr);
1da177e4 937
96b52e61 938 rcu_read_unlock();
1da177e4
LT		 939 return err;
940}
941
942/*
943 * identify MLD packets for MLD filter exceptions
944 */
945int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
946{
947 struct icmp6hdr *pic;
948
949 if (nexthdr != IPPROTO_ICMPV6)
950 return 0;
951
952 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
953 return 0;
954
cc70ab26 955 pic = icmp6_hdr(skb);
1da177e4
LT		 956
957 switch (pic->icmp6_type) {
958 case ICMPV6_MGM_QUERY:
959 case ICMPV6_MGM_REPORT:
960 case ICMPV6_MGM_REDUCTION:
961 case ICMPV6_MLD2_REPORT:
962 return 1;
963 default:
964 break;
965 }
966 return 0;
967}
968
969/*
970 * check if the interface/address pair is valid
971 */
9acd9f3a
YH		 972int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
973 const struct in6_addr *src_addr)
1da177e4
LT		 974{
975 struct inet6_dev *idev;
976 struct ifmcaddr6 *mc;
977 int rv = 0;
978
96b52e61
ED		 979 rcu_read_lock();
980 idev = __in6_dev_get(dev);
1da177e4
LT		 981 if (idev) {
982 read_lock_bh(&idev->lock);
983 for (mc = idev->mc_list; mc; mc=mc->next) {
984 if (ipv6_addr_equal(&mc->mca_addr, group))
985 break;
986 }
987 if (mc) {
988 if (src_addr && !ipv6_addr_any(src_addr)) {
989 struct ip6_sf_list *psf;
990
991 spin_lock_bh(&mc->mca_lock);
992 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
993 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
994 break;
995 }
996 if (psf)
997 rv = psf->sf_count[MCAST_INCLUDE] ||
998 psf->sf_count[MCAST_EXCLUDE] !=
999 mc->mca_sfcount[MCAST_EXCLUDE];
1000 else
1001 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1002 spin_unlock_bh(&mc->mca_lock);
1003 } else
1004 rv = 1; /* don't filter unspecified source */
1005 }
1006 read_unlock_bh(&idev->lock);
1da177e4 1007 }
96b52e61 1008 rcu_read_unlock();
1da177e4
LT		 1009 return rv;
1010}
1011
1012static void mld_gq_start_timer(struct inet6_dev *idev)
1013{
1014 int tv = net_random() % idev->mc_maxdelay;
1015
1016 idev->mc_gq_running = 1;
1017 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1018 in6_dev_hold(idev);
1019}
1020
1021static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1022{
1023 int tv = net_random() % delay;
1024
1025 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1026 in6_dev_hold(idev);
1027}
1028
1029/*
1030 * IGMP handling (alias multicast ICMPv6 messages)
1031 */
1032
1033static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1034{
1035 unsigned long delay = resptime;
1036
1037 /* Do not start timer for these addresses */
1038 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1039 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1040 return;
1041
1042 if (del_timer(&ma->mca_timer)) {
1043 atomic_dec(&ma->mca_refcnt);
1044 delay = ma->mca_timer.expires - jiffies;
1045 }
1046
1047 if (delay >= resptime) {
1048 if (resptime)
1049 delay = net_random() % resptime;
1050 else
1051 delay = 1;
1052 }
1053 ma->mca_timer.expires = jiffies + delay;
1054 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1055 atomic_inc(&ma->mca_refcnt);
1056 ma->mca_flags |= MAF_TIMER_RUNNING;
1057}
1058
5ab4a6c8
DS		 1059/* mark EXCLUDE-mode sources */
1060static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1061 struct in6_addr *srcs)
1062{
1063 struct ip6_sf_list *psf;
1064 int i, scount;
1065
1066 scount = 0;
1067 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1068 if (scount == nsrcs)
1069 break;
5ab4a6c8
DS		 1070 for (i=0; i<nsrcs; i++) {
1071 /* skip inactive filters */
1072 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1073 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1074 psf->sf_count[MCAST_EXCLUDE])
1075 continue;
1076 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1077 scount++;
1078 break;
1079 }
1080 }
1081 }
1082 pmc->mca_flags &= ~MAF_GSQUERY;
1083 if (scount == nsrcs) /* all sources excluded */
1084 return 0;
1085 return 1;
1086}
1087
1088static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1089 struct in6_addr *srcs)
1090{
1091 struct ip6_sf_list *psf;
1092 int i, scount;
1093
1094 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1095 return mld_xmarksources(pmc, nsrcs, srcs);
1096
1097 /* mark INCLUDE-mode sources */
1098
1099 scount = 0;
1100 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1101 if (scount == nsrcs)
1102 break;
1103 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1104 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1105 psf->sf_gsresp = 1;
1106 scount++;
1107 break;
1108 }
5ab4a6c8
DS		 1109 }
1110 }
1111 if (!scount) {
1112 pmc->mca_flags &= ~MAF_GSQUERY;
1113 return 0;
1da177e4 1114 }
5ab4a6c8
DS		 1115 pmc->mca_flags |= MAF_GSQUERY;
1116 return 1;
1da177e4
LT		 1117}
1118
96b52e61 1119/* called with rcu_read_lock() */
1da177e4
LT		 1120int igmp6_event_query(struct sk_buff *skb)
1121{
97300b5f 1122 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1123 struct ifmcaddr6 *ma;
1124 struct in6_addr *group;
1125 unsigned long max_delay;
1126 struct inet6_dev *idev;
6e7cb837 1127 struct mld_msg *mld;
1da177e4
LT		 1128 int group_type;
1129 int mark = 0;
1130 int len;
1131
1132 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1133 return -EINVAL;
1134
1135 /* compute payload length excluding extension headers */
0660e03f 1136 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1137 len -= skb_network_header_len(skb);
1da177e4
LT		 1138
1139 /* Drop queries with not link local source */
0660e03f 1140 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1141 return -EINVAL;
1142
96b52e61 1143 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1144
1145 if (idev == NULL)
1146 return 0;
1147
6e7cb837
YH		 1148 mld = (struct mld_msg *)icmp6_hdr(skb);
1149 group = &mld->mld_mca;
1da177e4
LT		 1150 group_type = ipv6_addr_type(group);
1151
1152 if (group_type != IPV6_ADDR_ANY &&
96b52e61 1153 !(group_type&IPV6_ADDR_MULTICAST))
1da177e4 1154 return -EINVAL;
1da177e4
LT		 1155
1156 if (len == 24) {
1157 int switchback;
1158 /* MLDv1 router present */
1159
1160 /* Translate milliseconds to jiffies */
6e7cb837 1161 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1da177e4
LT		 1162
1163 switchback = (idev->mc_qrv + 1) * max_delay;
1164 idev->mc_v1_seen = jiffies + switchback;
1165
1166 /* cancel the interface change timer */
1167 idev->mc_ifc_count = 0;
1168 if (del_timer(&idev->mc_ifc_timer))
1169 __in6_dev_put(idev);
1170 /* clear deleted report items */
1171 mld_clear_delrec(idev);
1172 } else if (len >= 28) {
1ab1457c 1173 int srcs_offset = sizeof(struct mld2_query) -
97300b5f 1174 sizeof(struct icmp6hdr);
96b52e61 1175 if (!pskb_may_pull(skb, srcs_offset))
97300b5f 1176 return -EINVAL;
96b52e61 1177
9c70220b 1178 mlh2 = (struct mld2_query *)skb_transport_header(skb);
6e7cb837 1179 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1da177e4
LT		 1180 if (!max_delay)
1181 max_delay = 1;
1182 idev->mc_maxdelay = max_delay;
6e7cb837
YH		 1183 if (mlh2->mld2q_qrv)
1184 idev->mc_qrv = mlh2->mld2q_qrv;
1da177e4 1185 if (group_type == IPV6_ADDR_ANY) { /* general query */
96b52e61 1186 if (mlh2->mld2q_nsrcs)
1da177e4 1187 return -EINVAL; /* no sources allowed */
96b52e61 1188
1da177e4 1189 mld_gq_start_timer(idev);
1da177e4
LT		 1190 return 0;
1191 }
1192 /* mark sources to include, if group & source-specific */
6e7cb837 1193 if (mlh2->mld2q_nsrcs != 0) {
1ab1457c 1194 if (!pskb_may_pull(skb, srcs_offset +
96b52e61 1195 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
97300b5f 1196 return -EINVAL;
96b52e61 1197
9c70220b 1198 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1199 mark = 1;
1200 }
96b52e61 1201 } else
1da177e4 1202 return -EINVAL;
1da177e4
LT		 1203
1204 read_lock_bh(&idev->lock);
1205 if (group_type == IPV6_ADDR_ANY) {
1206 for (ma = idev->mc_list; ma; ma=ma->next) {
1207 spin_lock_bh(&ma->mca_lock);
1208 igmp6_group_queried(ma, max_delay);
1209 spin_unlock_bh(&ma->mca_lock);
1210 }
1211 } else {
1212 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1213 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1214 continue;
1215 spin_lock_bh(&ma->mca_lock);
1216 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1217 /* gsquery <- gsquery && mark */
1218 if (!mark)
1219 ma->mca_flags &= ~MAF_GSQUERY;
1220 } else {
1221 /* gsquery <- mark */
1222 if (mark)
1223 ma->mca_flags |= MAF_GSQUERY;
1224 else
1225 ma->mca_flags &= ~MAF_GSQUERY;
1226 }
5ab4a6c8 1227 if (!(ma->mca_flags & MAF_GSQUERY) ||
6e7cb837 1228 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
5ab4a6c8 1229 igmp6_group_queried(ma, max_delay);
1da177e4 1230 spin_unlock_bh(&ma->mca_lock);
7add2a43 1231 break;
1da177e4
LT		 1232 }
1233 }
1234 read_unlock_bh(&idev->lock);
1da177e4
LT		 1235
1236 return 0;
1237}
1238
96b52e61 1239/* called with rcu_read_lock() */
1da177e4
LT		 1240int igmp6_event_report(struct sk_buff *skb)
1241{
1242 struct ifmcaddr6 *ma;
1da177e4 1243 struct inet6_dev *idev;
6e7cb837 1244 struct mld_msg *mld;
1da177e4
LT		 1245 int addr_type;
1246
1247 /* Our own report looped back. Ignore it. */
1248 if (skb->pkt_type == PACKET_LOOPBACK)
1249 return 0;
1250
24c69275
DS		 1251 /* send our report if the MC router may not have heard this report */
1252 if (skb->pkt_type != PACKET_MULTICAST &&
1253 skb->pkt_type != PACKET_BROADCAST)
1254 return 0;
1255
6e7cb837 1256 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1da177e4
LT		 1257 return -EINVAL;
1258
6e7cb837 1259 mld = (struct mld_msg *)icmp6_hdr(skb);
1da177e4
LT		 1260
1261 /* Drop reports with not link local source */
0660e03f 1262 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1263 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1264 !(addr_type&IPV6_ADDR_LINKLOCAL))
1265 return -EINVAL;
1266
96b52e61 1267 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1268 if (idev == NULL)
1269 return -ENODEV;
1270
1271 /*
1272 * Cancel the timer for this group
1273 */
1274
1275 read_lock_bh(&idev->lock);
1276 for (ma = idev->mc_list; ma; ma=ma->next) {
6e7cb837 1277 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1da177e4
LT		 1278 spin_lock(&ma->mca_lock);
1279 if (del_timer(&ma->mca_timer))
1280 atomic_dec(&ma->mca_refcnt);
1281 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1282 spin_unlock(&ma->mca_lock);
1283 break;
1284 }
1285 }
1286 read_unlock_bh(&idev->lock);
1da177e4
LT		 1287 return 0;
1288}
1289
1290static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1291 int gdeleted, int sdeleted)
1292{
1293 switch (type) {
1294 case MLD2_MODE_IS_INCLUDE:
1295 case MLD2_MODE_IS_EXCLUDE:
1296 if (gdeleted || sdeleted)
1297 return 0;
5ab4a6c8
DS		 1298 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1299 if (pmc->mca_sfmode == MCAST_INCLUDE)
1300 return 1;
1301 /* don't include if this source is excluded
1302 * in all filters
1303 */
1304 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1305 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1306 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1307 psf->sf_count[MCAST_EXCLUDE];
1308 }
1309 return 0;
1da177e4
LT		 1310 case MLD2_CHANGE_TO_INCLUDE:
1311 if (gdeleted || sdeleted)
1312 return 0;
1313 return psf->sf_count[MCAST_INCLUDE] != 0;
1314 case MLD2_CHANGE_TO_EXCLUDE:
1315 if (gdeleted || sdeleted)
1316 return 0;
1317 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1318 psf->sf_count[MCAST_INCLUDE])
1319 return 0;
1320 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1321 psf->sf_count[MCAST_EXCLUDE];
1322 case MLD2_ALLOW_NEW_SOURCES:
1323 if (gdeleted || !psf->sf_crcount)
1324 return 0;
1325 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1326 case MLD2_BLOCK_OLD_SOURCES:
1327 if (pmc->mca_sfmode == MCAST_INCLUDE)
1328 return gdeleted || (psf->sf_crcount && sdeleted);
1329 return psf->sf_crcount && !gdeleted && !sdeleted;
1330 }
1331 return 0;
1332}
1333
1334static int
1335mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1336{
1337 struct ip6_sf_list *psf;
1338 int scount = 0;
1339
1340 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1341 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1342 continue;
1343 scount++;
1344 }
1345 return scount;
1346}
1347
1348static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1349{
c346dca1 1350 struct net *net = dev_net(dev);
b8ad0cbc 1351 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1352 struct sk_buff *skb;
1353 struct mld2_report *pmr;
1354 struct in6_addr addr_buf;
d7aabf22 1355 const struct in6_addr *saddr;
1da177e4
LT		 1356 int err;
1357 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1358 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1359 IPV6_TLV_PADN, 0 };
1360
1361 /* we assume size > sizeof(ra) here */
72e09ad1
ED		 1362 size += LL_ALLOCATED_SPACE(dev);
1363 /* limit our allocations to order-0 page */
1364 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1365 skb = sock_alloc_send_skb(sk, size, 1, &err);
1da177e4 1366
cfcabdcc 1367 if (!skb)
1da177e4
LT		 1368 return NULL;
1369
1370 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1371
95c385b4 1372 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1373 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1374 * use unspecified address as the source address
1da177e4
LT		 1375 * when a valid link-local address is not available.
1376 */
d7aabf22
YH		 1377 saddr = &in6addr_any;
1378 } else
1379 saddr = &addr_buf;
1da177e4 1380
d7aabf22 1381 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4
LT		 1382
1383 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1384
27a884dc 1385 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1386 skb_put(skb, sizeof(*pmr));
1387 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837
YH		 1388 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1389 pmr->mld2r_resv1 = 0;
1390 pmr->mld2r_cksum = 0;
1391 pmr->mld2r_resv2 = 0;
1392 pmr->mld2r_ngrec = 0;
1da177e4
LT		 1393 return skb;
1394}
1395
1396static void mld_sendpack(struct sk_buff *skb)
1397{
0660e03f 1398 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1399 struct mld2_report *pmr =
1400 (struct mld2_report *)skb_transport_header(skb);
1da177e4 1401 int payload_len, mldlen;
96b52e61 1402 struct inet6_dev *idev;
c346dca1 1403 struct net *net = dev_net(skb->dev);
1da177e4 1404 int err;
41927178 1405 struct flowi fl;
adf30907 1406 struct dst_entry *dst;
1da177e4 1407
96b52e61
ED		 1408 rcu_read_lock();
1409 idev = __in6_dev_get(skb->dev);
edf391ff
NH		 1410 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1411
27a884dc
ACM		 1412 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1413 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1414 pip6->payload_len = htons(payload_len);
1415
6e7cb837
YH		 1416 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1417 IPPROTO_ICMPV6,
1418 csum_partial(skb_transport_header(skb),
1419 mldlen, 0));
41927178 1420
adf30907 1421 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
41927178 1422
adf30907 1423 if (!dst) {
41927178
YH		 1424 err = -ENOMEM;
1425 goto err_out;
1426 }
1427
b8ad0cbc 1428 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
41927178
YH		 1429 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1430 skb->dev->ifindex);
1431
adf30907
ED		 1432 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1433 skb_dst_set(skb, dst);
41927178
YH		 1434 if (err)
1435 goto err_out;
1436
edf391ff
NH		 1437 payload_len = skb->len;
1438
b2e0b385 1439 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1440 dst_output);
1441out:
1da177e4 1442 if (!err) {
5a57d4c7 1443 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
e41b5368 1444 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1445 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1da177e4 1446 } else
483a47d2 1447 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1448
96b52e61 1449 rcu_read_unlock();
41927178
YH		 1450 return;
1451
1452err_out:
1453 kfree_skb(skb);
1454 goto out;
1da177e4
LT		 1455}
1456
1457static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1458{
fab10fe3 1459 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1460}
1461
1462static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1463 int type, struct mld2_grec **ppgr)
1464{
1465 struct net_device *dev = pmc->idev->dev;
1466 struct mld2_report *pmr;
1467 struct mld2_grec *pgr;
1468
1469 if (!skb)
1470 skb = mld_newpack(dev, dev->mtu);
1471 if (!skb)
1472 return NULL;
1473 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1474 pgr->grec_type = type;
1475 pgr->grec_auxwords = 0;
1476 pgr->grec_nsrcs = 0;
1477 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1478 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1479 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT		 1480 *ppgr = pgr;
1481 return skb;
1482}
1483
1484#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1485 skb_tailroom(skb)) : 0)
1486
1487static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1488 int type, int gdeleted, int sdeleted)
1489{
1490 struct net_device *dev = pmc->idev->dev;
1491 struct mld2_report *pmr;
1492 struct mld2_grec *pgr = NULL;
1493 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1494 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1495
1496 if (pmc->mca_flags & MAF_NOREPORT)
1497 return skb;
1498
1499 isquery = type == MLD2_MODE_IS_INCLUDE ||
1500 type == MLD2_MODE_IS_EXCLUDE;
1501 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1502 type == MLD2_CHANGE_TO_EXCLUDE;
1503
5ab4a6c8
DS		 1504 stotal = scount = 0;
1505
1da177e4
LT		 1506 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1507
5ab4a6c8
DS		 1508 if (!*psf_list)
1509 goto empty_source;
1510
9c70220b 1511 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1512
1513 /* EX and TO_EX get a fresh packet, if needed */
1514 if (truncate) {
6e7cb837 1515 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT		 1516 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1517 if (skb)
1518 mld_sendpack(skb);
1519 skb = mld_newpack(dev, dev->mtu);
1520 }
1521 }
1522 first = 1;
1da177e4
LT		 1523 psf_prev = NULL;
1524 for (psf=*psf_list; psf; psf=psf_next) {
1525 struct in6_addr *psrc;
1526
1527 psf_next = psf->sf_next;
1528
1529 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1530 psf_prev = psf;
1531 continue;
1532 }
1533
1534 /* clear marks on query responses */
1535 if (isquery)
1536 psf->sf_gsresp = 0;
1537
1538 if (AVAILABLE(skb) < sizeof(*psrc) +
1539 first*sizeof(struct mld2_grec)) {
1540 if (truncate && !first)
1541 break; /* truncate these */
1542 if (pgr)
1543 pgr->grec_nsrcs = htons(scount);
1544 if (skb)
1545 mld_sendpack(skb);
1546 skb = mld_newpack(dev, dev->mtu);
1547 first = 1;
1548 scount = 0;
1549 }
1550 if (first) {
1551 skb = add_grhead(skb, pmc, type, &pgr);
1552 first = 0;
1553 }
cc63f70b
AD		 1554 if (!skb)
1555 return NULL;
1da177e4
LT		 1556 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1557 *psrc = psf->sf_addr;
5ab4a6c8 1558 scount++; stotal++;
1da177e4
LT		 1559 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1560 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1561 psf->sf_crcount--;
1562 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1563 if (psf_prev)
1564 psf_prev->sf_next = psf->sf_next;
1565 else
1566 *psf_list = psf->sf_next;
1567 kfree(psf);
1568 continue;
1569 }
1570 }
1571 psf_prev = psf;
1572 }
5ab4a6c8
DS		 1573
1574empty_source:
1575 if (!stotal) {
1576 if (type == MLD2_ALLOW_NEW_SOURCES ||
1577 type == MLD2_BLOCK_OLD_SOURCES)
1578 return skb;
1579 if (pmc->mca_crcount || isquery) {
1580 /* make sure we have room for group header */
1581 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1582 mld_sendpack(skb);
1583 skb = NULL; /* add_grhead will get a new one */
1584 }
1585 skb = add_grhead(skb, pmc, type, &pgr);
1586 }
1587 }
1da177e4
LT		 1588 if (pgr)
1589 pgr->grec_nsrcs = htons(scount);
1590
1591 if (isquery)
1592 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1593 return skb;
1594}
1595
1596static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1597{
1598 struct sk_buff *skb = NULL;
1599 int type;
1600
1601 if (!pmc) {
1602 read_lock_bh(&idev->lock);
1603 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1604 if (pmc->mca_flags & MAF_NOREPORT)
1605 continue;
1606 spin_lock_bh(&pmc->mca_lock);
1607 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1608 type = MLD2_MODE_IS_EXCLUDE;
1609 else
1610 type = MLD2_MODE_IS_INCLUDE;
1611 skb = add_grec(skb, pmc, type, 0, 0);
1612 spin_unlock_bh(&pmc->mca_lock);
1613 }
1614 read_unlock_bh(&idev->lock);
1615 } else {
1616 spin_lock_bh(&pmc->mca_lock);
1617 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1618 type = MLD2_MODE_IS_EXCLUDE;
1619 else
1620 type = MLD2_MODE_IS_INCLUDE;
1621 skb = add_grec(skb, pmc, type, 0, 0);
1622 spin_unlock_bh(&pmc->mca_lock);
1623 }
1624 if (skb)
1625 mld_sendpack(skb);
1626}
1627
1628/*
1629 * remove zero-count source records from a source filter list
1630 */
1631static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1632{
1633 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1634
1635 psf_prev = NULL;
1636 for (psf=*ppsf; psf; psf = psf_next) {
1637 psf_next = psf->sf_next;
1638 if (psf->sf_crcount == 0) {
1639 if (psf_prev)
1640 psf_prev->sf_next = psf->sf_next;
1641 else
1642 *ppsf = psf->sf_next;
1643 kfree(psf);
1644 } else
1645 psf_prev = psf;
1646 }
1647}
1648
1649static void mld_send_cr(struct inet6_dev *idev)
1650{
1651 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1652 struct sk_buff *skb = NULL;
1653 int type, dtype;
1654
1655 read_lock_bh(&idev->lock);
6457d26b 1656 spin_lock(&idev->mc_lock);
1da177e4
LT		 1657
1658 /* deleted MCA's */
1659 pmc_prev = NULL;
1660 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1661 pmc_next = pmc->next;
1662 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1663 type = MLD2_BLOCK_OLD_SOURCES;
1664 dtype = MLD2_BLOCK_OLD_SOURCES;
1665 skb = add_grec(skb, pmc, type, 1, 0);
1666 skb = add_grec(skb, pmc, dtype, 1, 1);
1667 }
1668 if (pmc->mca_crcount) {
1da177e4
LT		 1669 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1670 type = MLD2_CHANGE_TO_INCLUDE;
1671 skb = add_grec(skb, pmc, type, 1, 0);
1672 }
5ab4a6c8 1673 pmc->mca_crcount--;
1da177e4
LT		 1674 if (pmc->mca_crcount == 0) {
1675 mld_clear_zeros(&pmc->mca_tomb);
1676 mld_clear_zeros(&pmc->mca_sources);
1677 }
1678 }
1679 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1680 !pmc->mca_sources) {
1681 if (pmc_prev)
1682 pmc_prev->next = pmc_next;
1683 else
1684 idev->mc_tomb = pmc_next;
1685 in6_dev_put(pmc->idev);
1686 kfree(pmc);
1687 } else
1688 pmc_prev = pmc;
1689 }
6457d26b 1690 spin_unlock(&idev->mc_lock);
1da177e4
LT		 1691
1692 /* change recs */
1693 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1694 spin_lock_bh(&pmc->mca_lock);
1695 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1696 type = MLD2_BLOCK_OLD_SOURCES;
1697 dtype = MLD2_ALLOW_NEW_SOURCES;
1698 } else {
1699 type = MLD2_ALLOW_NEW_SOURCES;
1700 dtype = MLD2_BLOCK_OLD_SOURCES;
1701 }
1702 skb = add_grec(skb, pmc, type, 0, 0);
1703 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1704
1705 /* filter mode changes */
1706 if (pmc->mca_crcount) {
1da177e4
LT		 1707 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1708 type = MLD2_CHANGE_TO_EXCLUDE;
1709 else
1710 type = MLD2_CHANGE_TO_INCLUDE;
1711 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1712 pmc->mca_crcount--;
1da177e4
LT		 1713 }
1714 spin_unlock_bh(&pmc->mca_lock);
1715 }
1716 read_unlock_bh(&idev->lock);
1717 if (!skb)
1718 return;
1719 (void) mld_sendpack(skb);
1720}
1721
1722static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1723{
c346dca1 1724 struct net *net = dev_net(dev);
b8ad0cbc 1725 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1726 struct inet6_dev *idev;
1ab1457c 1727 struct sk_buff *skb;
6e7cb837 1728 struct mld_msg *hdr;
d7aabf22 1729 const struct in6_addr *snd_addr, *saddr;
1da177e4 1730 struct in6_addr addr_buf;
1da177e4
LT		 1731 int err, len, payload_len, full_len;
1732 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1733 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1734 IPV6_TLV_PADN, 0 };
41927178 1735 struct flowi fl;
adf30907 1736 struct dst_entry *dst;
1da177e4 1737
f3ee4010
YH		 1738 if (type == ICMPV6_MGM_REDUCTION)
1739 snd_addr = &in6addr_linklocal_allrouters;
1740 else
1741 snd_addr = addr;
1da177e4
LT		 1742
1743 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1744 payload_len = len + sizeof(ra);
1745 full_len = sizeof(struct ipv6hdr) + payload_len;
1746
edf391ff
NH		 1747 rcu_read_lock();
1748 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1749 IPSTATS_MIB_OUT, full_len);
1750 rcu_read_unlock();
1751
f5184d26 1752 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1da177e4
LT		 1753
1754 if (skb == NULL) {
a11d206d 1755 rcu_read_lock();
3bd653c8 1756 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 1757 IPSTATS_MIB_OUTDISCARDS);
1758 rcu_read_unlock();
1da177e4
LT		 1759 return;
1760 }
1761
1762 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1763
95c385b4 1764 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1765 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1766 * use unspecified address as the source address
1da177e4
LT		 1767 * when a valid link-local address is not available.
1768 */
d7aabf22
YH		 1769 saddr = &in6addr_any;
1770 } else
1771 saddr = &addr_buf;
1da177e4 1772
d7aabf22 1773 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT		 1774
1775 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1776
6e7cb837
YH		 1777 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1778 memset(hdr, 0, sizeof(struct mld_msg));
1779 hdr->mld_type = type;
1780 ipv6_addr_copy(&hdr->mld_mca, addr);
1da177e4 1781
6e7cb837
YH		 1782 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1783 IPPROTO_ICMPV6,
1784 csum_partial(hdr, len, 0));
1da177e4 1785
96b52e61
ED		 1786 rcu_read_lock();
1787 idev = __in6_dev_get(skb->dev);
1da177e4 1788
adf30907
ED		 1789 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1790 if (!dst) {
41927178
YH		 1791 err = -ENOMEM;
1792 goto err_out;
1793 }
1794
b8ad0cbc 1795 icmpv6_flow_init(sk, &fl, type,
41927178
YH		 1796 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1797 skb->dev->ifindex);
1798
adf30907 1799 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
41927178
YH		 1800 if (err)
1801 goto err_out;
1802
adf30907 1803 skb_dst_set(skb, dst);
b2e0b385 1804 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1805 dst_output);
1806out:
1da177e4 1807 if (!err) {
5c5d244b 1808 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 1809 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1810 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1da177e4 1811 } else
3bd653c8 1812 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1813
96b52e61 1814 rcu_read_unlock();
1da177e4 1815 return;
41927178
YH		 1816
1817err_out:
1818 kfree_skb(skb);
1819 goto out;
1da177e4
LT		 1820}
1821
1822static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1823 struct in6_addr *psfsrc)
1824{
1825 struct ip6_sf_list *psf, *psf_prev;
1826 int rv = 0;
1827
1828 psf_prev = NULL;
1829 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1830 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1831 break;
1832 psf_prev = psf;
1833 }
1834 if (!psf || psf->sf_count[sfmode] == 0) {
1835 /* source filter not found, or count wrong => bug */
1836 return -ESRCH;
1837 }
1838 psf->sf_count[sfmode]--;
1839 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1840 struct inet6_dev *idev = pmc->idev;
1841
1842 /* no more filters for this source */
1843 if (psf_prev)
1844 psf_prev->sf_next = psf->sf_next;
1845 else
1846 pmc->mca_sources = psf->sf_next;
1847 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1848 !MLD_V1_SEEN(idev)) {
1849 psf->sf_crcount = idev->mc_qrv;
1850 psf->sf_next = pmc->mca_tomb;
1851 pmc->mca_tomb = psf;
1852 rv = 1;
1853 } else
1854 kfree(psf);
1855 }
1856 return rv;
1857}
1858
1859static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1860 int sfmode, int sfcount, struct in6_addr *psfsrc,
1861 int delta)
1862{
1863 struct ifmcaddr6 *pmc;
1864 int changerec = 0;
1865 int i, err;
1866
1867 if (!idev)
1868 return -ENODEV;
1869 read_lock_bh(&idev->lock);
1870 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1871 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1872 break;
1873 }
1874 if (!pmc) {
1875 /* MCA not found?? bug */
1876 read_unlock_bh(&idev->lock);
1877 return -ESRCH;
1878 }
1879 spin_lock_bh(&pmc->mca_lock);
1880 sf_markstate(pmc);
1881 if (!delta) {
1882 if (!pmc->mca_sfcount[sfmode]) {
1883 spin_unlock_bh(&pmc->mca_lock);
1884 read_unlock_bh(&idev->lock);
1885 return -EINVAL;
1886 }
1887 pmc->mca_sfcount[sfmode]--;
1888 }
1889 err = 0;
1890 for (i=0; i<sfcount; i++) {
1891 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1892
1893 changerec |= rv > 0;
1894 if (!err && rv < 0)
1895 err = rv;
1896 }
1897 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1898 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1899 pmc->mca_sfcount[MCAST_INCLUDE]) {
1900 struct ip6_sf_list *psf;
1901
1902 /* filter mode change */
1903 pmc->mca_sfmode = MCAST_INCLUDE;
1904 pmc->mca_crcount = idev->mc_qrv;
1905 idev->mc_ifc_count = pmc->mca_crcount;
1906 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1907 psf->sf_crcount = 0;
1908 mld_ifc_event(pmc->idev);
1909 } else if (sf_setstate(pmc) || changerec)
1910 mld_ifc_event(pmc->idev);
1911 spin_unlock_bh(&pmc->mca_lock);
1912 read_unlock_bh(&idev->lock);
1913 return err;
1914}
1915
1916/*
1917 * Add multicast single-source filter to the interface list
1918 */
1919static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1920 struct in6_addr *psfsrc, int delta)
1921{
1922 struct ip6_sf_list *psf, *psf_prev;
1923
1924 psf_prev = NULL;
1925 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1926 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1927 break;
1928 psf_prev = psf;
1929 }
1930 if (!psf) {
0c600eda 1931 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1932 if (!psf)
1933 return -ENOBUFS;
0c600eda 1934
1da177e4
LT		 1935 psf->sf_addr = *psfsrc;
1936 if (psf_prev) {
1937 psf_prev->sf_next = psf;
1938 } else
1939 pmc->mca_sources = psf;
1940 }
1941 psf->sf_count[sfmode]++;
1942 return 0;
1943}
1944
1945static void sf_markstate(struct ifmcaddr6 *pmc)
1946{
1947 struct ip6_sf_list *psf;
1948 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1949
1950 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1951 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1952 psf->sf_oldin = mca_xcount ==
1953 psf->sf_count[MCAST_EXCLUDE] &&
1954 !psf->sf_count[MCAST_INCLUDE];
1955 } else
1956 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1957}
1958
1959static int sf_setstate(struct ifmcaddr6 *pmc)
1960{
7add2a43 1961 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 1962 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1963 int qrv = pmc->idev->mc_qrv;
1964 int new_in, rv;
1965
1966 rv = 0;
1967 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1968 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1969 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1970 !psf->sf_count[MCAST_INCLUDE];
1971 } else
1972 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 1973 if (new_in) {
1974 if (!psf->sf_oldin) {
e80e28b6 1975 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 1976
1977 for (dpsf=pmc->mca_tomb; dpsf;
1978 dpsf=dpsf->sf_next) {
1979 if (ipv6_addr_equal(&dpsf->sf_addr,
1980 &psf->sf_addr))
1981 break;
1982 prev = dpsf;
1983 }
1984 if (dpsf) {
1985 if (prev)
1986 prev->sf_next = dpsf->sf_next;
1987 else
1988 pmc->mca_tomb = dpsf->sf_next;
1989 kfree(dpsf);
1990 }
1991 psf->sf_crcount = qrv;
1992 rv++;
1993 }
1994 } else if (psf->sf_oldin) {
1995 psf->sf_crcount = 0;
1996 /*
1997 * add or update "delete" records if an active filter
1998 * is now inactive
1999 */
2000 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2001 if (ipv6_addr_equal(&dpsf->sf_addr,
2002 &psf->sf_addr))
2003 break;
2004 if (!dpsf) {
5d55354f 2005 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
7add2a43
DS		 2006 if (!dpsf)
2007 continue;
2008 *dpsf = *psf;
2009 /* pmc->mca_lock held by callers */
2010 dpsf->sf_next = pmc->mca_tomb;
2011 pmc->mca_tomb = dpsf;
2012 }
2013 dpsf->sf_crcount = qrv;
1da177e4
LT		 2014 rv++;
2015 }
2016 }
2017 return rv;
2018}
2019
2020/*
2021 * Add multicast source filter list to the interface list
2022 */
2023static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2024 int sfmode, int sfcount, struct in6_addr *psfsrc,
2025 int delta)
2026{
2027 struct ifmcaddr6 *pmc;
2028 int isexclude;
2029 int i, err;
2030
2031 if (!idev)
2032 return -ENODEV;
2033 read_lock_bh(&idev->lock);
2034 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2035 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2036 break;
2037 }
2038 if (!pmc) {
2039 /* MCA not found?? bug */
2040 read_unlock_bh(&idev->lock);
2041 return -ESRCH;
2042 }
2043 spin_lock_bh(&pmc->mca_lock);
2044
2045 sf_markstate(pmc);
2046 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2047 if (!delta)
2048 pmc->mca_sfcount[sfmode]++;
2049 err = 0;
2050 for (i=0; i<sfcount; i++) {
2051 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2052 if (err)
2053 break;
2054 }
2055 if (err) {
2056 int j;
2057
2058 if (!delta)
2059 pmc->mca_sfcount[sfmode]--;
2060 for (j=0; j<i; j++)
2061 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2062 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2063 struct ip6_sf_list *psf;
2064
2065 /* filter mode change */
2066 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2067 pmc->mca_sfmode = MCAST_EXCLUDE;
2068 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2069 pmc->mca_sfmode = MCAST_INCLUDE;
2070 /* else no filters; keep old mode for reports */
2071
2072 pmc->mca_crcount = idev->mc_qrv;
2073 idev->mc_ifc_count = pmc->mca_crcount;
2074 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2075 psf->sf_crcount = 0;
2076 mld_ifc_event(idev);
2077 } else if (sf_setstate(pmc))
2078 mld_ifc_event(idev);
2079 spin_unlock_bh(&pmc->mca_lock);
2080 read_unlock_bh(&idev->lock);
2081 return err;
2082}
2083
2084static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2085{
2086 struct ip6_sf_list *psf, *nextpsf;
2087
2088 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2089 nextpsf = psf->sf_next;
2090 kfree(psf);
2091 }
2092 pmc->mca_tomb = NULL;
2093 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2094 nextpsf = psf->sf_next;
2095 kfree(psf);
2096 }
2097 pmc->mca_sources = NULL;
2098 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2099 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2100 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2101}
2102
2103
2104static void igmp6_join_group(struct ifmcaddr6 *ma)
2105{
2106 unsigned long delay;
2107
2108 if (ma->mca_flags & MAF_NOREPORT)
2109 return;
2110
2111 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2112
2113 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2114
2115 spin_lock_bh(&ma->mca_lock);
2116 if (del_timer(&ma->mca_timer)) {
2117 atomic_dec(&ma->mca_refcnt);
2118 delay = ma->mca_timer.expires - jiffies;
2119 }
2120
2121 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2122 atomic_inc(&ma->mca_refcnt);
2123 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2124 spin_unlock_bh(&ma->mca_lock);
2125}
2126
2127static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2128 struct inet6_dev *idev)
2129{
2130 int err;
2131
5ab4a6c8
DS		 2132 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2133 * so no other readers or writers of iml or its sflist
2134 */
cfcabdcc 2135 if (!iml->sflist) {
1da177e4
LT		 2136 /* any-source empty exclude case */
2137 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2138 }
2139 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2140 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2141 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2142 iml->sflist = NULL;
2143 return err;
2144}
2145
2146static void igmp6_leave_group(struct ifmcaddr6 *ma)
2147{
2148 if (MLD_V1_SEEN(ma->idev)) {
2149 if (ma->mca_flags & MAF_LAST_REPORTER)
2150 igmp6_send(&ma->mca_addr, ma->idev->dev,
2151 ICMPV6_MGM_REDUCTION);
2152 } else {
2153 mld_add_delrec(ma->idev, ma);
2154 mld_ifc_event(ma->idev);
2155 }
2156}
2157
2158static void mld_gq_timer_expire(unsigned long data)
2159{
2160 struct inet6_dev *idev = (struct inet6_dev *)data;
2161
2162 idev->mc_gq_running = 0;
2163 mld_send_report(idev, NULL);
2164 __in6_dev_put(idev);
2165}
2166
2167static void mld_ifc_timer_expire(unsigned long data)
2168{
2169 struct inet6_dev *idev = (struct inet6_dev *)data;
2170
2171 mld_send_cr(idev);
2172 if (idev->mc_ifc_count) {
2173 idev->mc_ifc_count--;
2174 if (idev->mc_ifc_count)
2175 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2176 }
2177 __in6_dev_put(idev);
2178}
2179
2180static void mld_ifc_event(struct inet6_dev *idev)
2181{
2182 if (MLD_V1_SEEN(idev))
2183 return;
2184 idev->mc_ifc_count = idev->mc_qrv;
2185 mld_ifc_start_timer(idev, 1);
2186}
2187
2188
2189static void igmp6_timer_handler(unsigned long data)
2190{
2191 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2192
2193 if (MLD_V1_SEEN(ma->idev))
2194 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2195 else
2196 mld_send_report(ma->idev, ma);
2197
2198 spin_lock(&ma->mca_lock);
2199 ma->mca_flags |= MAF_LAST_REPORTER;
2200 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2201 spin_unlock(&ma->mca_lock);
2202 ma_put(ma);
2203}
2204
75c78500
MS		 2205/* Device changing type */
2206
2207void ipv6_mc_unmap(struct inet6_dev *idev)
2208{
2209 struct ifmcaddr6 *i;
2210
2211 /* Install multicast list, except for all-nodes (already installed) */
2212
2213 read_lock_bh(&idev->lock);
2214 for (i = idev->mc_list; i; i = i->next)
2215 igmp6_group_dropped(i);
2216 read_unlock_bh(&idev->lock);
2217}
2218
2219void ipv6_mc_remap(struct inet6_dev *idev)
2220{
2221 ipv6_mc_up(idev);
2222}
2223
1da177e4
LT		 2224/* Device going down */
2225
2226void ipv6_mc_down(struct inet6_dev *idev)
2227{
2228 struct ifmcaddr6 *i;
2229
2230 /* Withdraw multicast list */
2231
2232 read_lock_bh(&idev->lock);
2233 idev->mc_ifc_count = 0;
2234 if (del_timer(&idev->mc_ifc_timer))
2235 __in6_dev_put(idev);
2236 idev->mc_gq_running = 0;
2237 if (del_timer(&idev->mc_gq_timer))
2238 __in6_dev_put(idev);
2239
2240 for (i = idev->mc_list; i; i=i->next)
2241 igmp6_group_dropped(i);
2242 read_unlock_bh(&idev->lock);
2243
2244 mld_clear_delrec(idev);
2245}
2246
2247
2248/* Device going up */
2249
2250void ipv6_mc_up(struct inet6_dev *idev)
2251{
2252 struct ifmcaddr6 *i;
2253
2254 /* Install multicast list, except for all-nodes (already installed) */
2255
2256 read_lock_bh(&idev->lock);
2257 for (i = idev->mc_list; i; i=i->next)
2258 igmp6_group_added(i);
2259 read_unlock_bh(&idev->lock);
2260}
2261
2262/* IPv6 device initialization. */
2263
2264void ipv6_mc_init_dev(struct inet6_dev *idev)
2265{
1da177e4 2266 write_lock_bh(&idev->lock);
6457d26b 2267 spin_lock_init(&idev->mc_lock);
1da177e4 2268 idev->mc_gq_running = 0;
b24b8a24
PE		 2269 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2270 (unsigned long)idev);
1da177e4
LT		 2271 idev->mc_tomb = NULL;
2272 idev->mc_ifc_count = 0;
b24b8a24
PE		 2273 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2274 (unsigned long)idev);
1da177e4
LT		 2275 idev->mc_qrv = MLD_QRV_DEFAULT;
2276 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2277 idev->mc_v1_seen = 0;
2278 write_unlock_bh(&idev->lock);
1da177e4
LT		 2279}
2280
2281/*
2282 * Device is about to be destroyed: clean up.
2283 */
2284
2285void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2286{
2287 struct ifmcaddr6 *i;
1da177e4
LT		 2288
2289 /* Deactivate timers */
2290 ipv6_mc_down(idev);
2291
2292 /* Delete all-nodes address. */
1da177e4
LT		 2293 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2294 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2295 * fail.
2296 */
f3ee4010 2297 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2298
f3ee4010
YH		 2299 if (idev->cnf.forwarding)
2300 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2301
2302 write_lock_bh(&idev->lock);
2303 while ((i = idev->mc_list) != NULL) {
2304 idev->mc_list = i->next;
2305 write_unlock_bh(&idev->lock);
2306
2307 igmp6_group_dropped(i);
2308 ma_put(i);
2309
2310 write_lock_bh(&idev->lock);
2311 }
2312 write_unlock_bh(&idev->lock);
2313}
2314
2315#ifdef CONFIG_PROC_FS
2316struct igmp6_mc_iter_state {
b8ad0cbc 2317 struct seq_net_private p;
1da177e4
LT		 2318 struct net_device *dev;
2319 struct inet6_dev *idev;
2320};
2321
2322#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2323
2324static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2325{
2326 struct ifmcaddr6 *im = NULL;
2327 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2328 struct net *net = seq_file_net(seq);
1da177e4 2329
7562f876 2330 state->idev = NULL;
ce81b76a 2331 for_each_netdev_rcu(net, state->dev) {
1da177e4 2332 struct inet6_dev *idev;
ce81b76a 2333 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2334 if (!idev)
2335 continue;
2336 read_lock_bh(&idev->lock);
2337 im = idev->mc_list;
2338 if (im) {
2339 state->idev = idev;
2340 break;
2341 }
2342 read_unlock_bh(&idev->lock);
1da177e4
LT		 2343 }
2344 return im;
2345}
2346
2347static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2348{
2349 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2350
2351 im = im->next;
2352 while (!im) {
ce81b76a 2353 if (likely(state->idev != NULL))
1da177e4 2354 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2355
2356 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2357 if (!state->dev) {
2358 state->idev = NULL;
2359 break;
2360 }
ce81b76a 2361 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2362 if (!state->idev)
2363 continue;
2364 read_lock_bh(&state->idev->lock);
2365 im = state->idev->mc_list;
2366 }
2367 return im;
2368}
2369
2370static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2371{
2372 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2373 if (im)
2374 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2375 --pos;
2376 return pos ? NULL : im;
2377}
2378
2379static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2380 __acquires(RCU)
1da177e4 2381{
ce81b76a 2382 rcu_read_lock();
1da177e4
LT		 2383 return igmp6_mc_get_idx(seq, *pos);
2384}
2385
2386static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2387{
ce81b76a
ED		 2388 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2389
1da177e4
LT		 2390 ++*pos;
2391 return im;
2392}
2393
2394static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2395 __releases(RCU)
1da177e4
LT		 2396{
2397 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2398
1da177e4
LT		 2399 if (likely(state->idev != NULL)) {
2400 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2401 state->idev = NULL;
2402 }
2403 state->dev = NULL;
ce81b76a 2404 rcu_read_unlock();
1da177e4
LT		 2405}
2406
2407static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2408{
2409 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2410 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2411
2412 seq_printf(seq,
4b7a4274 2413 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2414 state->dev->ifindex, state->dev->name,
b071195d 2415 &im->mca_addr,
1da177e4
LT		 2416 im->mca_users, im->mca_flags,
2417 (im->mca_flags&MAF_TIMER_RUNNING) ?
2418 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2419 return 0;
2420}
2421
56b3d975 2422static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2423 .start = igmp6_mc_seq_start,
2424 .next = igmp6_mc_seq_next,
2425 .stop = igmp6_mc_seq_stop,
2426 .show = igmp6_mc_seq_show,
2427};
2428
2429static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2430{
b8ad0cbc
DL		 2431 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2432 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2433}
2434
9a32144e 2435static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2436 .owner = THIS_MODULE,
2437 .open = igmp6_mc_seq_open,
2438 .read = seq_read,
2439 .llseek = seq_lseek,
b8ad0cbc 2440 .release = seq_release_net,
1da177e4
LT		 2441};
2442
2443struct igmp6_mcf_iter_state {
b8ad0cbc 2444 struct seq_net_private p;
1da177e4
LT		 2445 struct net_device *dev;
2446 struct inet6_dev *idev;
2447 struct ifmcaddr6 *im;
2448};
2449
2450#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2451
2452static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2453{
2454 struct ip6_sf_list *psf = NULL;
2455 struct ifmcaddr6 *im = NULL;
2456 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2457 struct net *net = seq_file_net(seq);
1da177e4 2458
7562f876
PE		 2459 state->idev = NULL;
2460 state->im = NULL;
ce81b76a 2461 for_each_netdev_rcu(net, state->dev) {
1da177e4 2462 struct inet6_dev *idev;
ce81b76a 2463 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2464 if (unlikely(idev == NULL))
2465 continue;
2466 read_lock_bh(&idev->lock);
2467 im = idev->mc_list;
2468 if (likely(im != NULL)) {
2469 spin_lock_bh(&im->mca_lock);
2470 psf = im->mca_sources;
2471 if (likely(psf != NULL)) {
2472 state->im = im;
2473 state->idev = idev;
2474 break;
2475 }
2476 spin_unlock_bh(&im->mca_lock);
2477 }
2478 read_unlock_bh(&idev->lock);
1da177e4
LT		 2479 }
2480 return psf;
2481}
2482
2483static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2484{
2485 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2486
2487 psf = psf->sf_next;
2488 while (!psf) {
2489 spin_unlock_bh(&state->im->mca_lock);
2490 state->im = state->im->next;
2491 while (!state->im) {
ce81b76a 2492 if (likely(state->idev != NULL))
1da177e4 2493 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2494
2495 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2496 if (!state->dev) {
2497 state->idev = NULL;
2498 goto out;
2499 }
ce81b76a 2500 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2501 if (!state->idev)
2502 continue;
2503 read_lock_bh(&state->idev->lock);
2504 state->im = state->idev->mc_list;
2505 }
2506 if (!state->im)
2507 break;
2508 spin_lock_bh(&state->im->mca_lock);
2509 psf = state->im->mca_sources;
2510 }
2511out:
2512 return psf;
2513}
2514
2515static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2516{
2517 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2518 if (psf)
2519 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2520 --pos;
2521 return pos ? NULL : psf;
2522}
2523
2524static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2525 __acquires(RCU)
1da177e4 2526{
ce81b76a 2527 rcu_read_lock();
1da177e4
LT		 2528 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2529}
2530
2531static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2532{
2533 struct ip6_sf_list *psf;
2534 if (v == SEQ_START_TOKEN)
2535 psf = igmp6_mcf_get_first(seq);
2536 else
2537 psf = igmp6_mcf_get_next(seq, v);
2538 ++*pos;
2539 return psf;
2540}
2541
2542static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2543 __releases(RCU)
1da177e4
LT		 2544{
2545 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2546 if (likely(state->im != NULL)) {
2547 spin_unlock_bh(&state->im->mca_lock);
2548 state->im = NULL;
2549 }
2550 if (likely(state->idev != NULL)) {
2551 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2552 state->idev = NULL;
2553 }
2554 state->dev = NULL;
ce81b76a 2555 rcu_read_unlock();
1da177e4
LT		 2556}
2557
2558static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2559{
2560 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2561 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2562
2563 if (v == SEQ_START_TOKEN) {
1ab1457c 2564 seq_printf(seq,
1da177e4 2565 "%3s %6s "
9343e79a 2566 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2567 "Device", "Multicast Address",
2568 "Source Address", "INC", "EXC");
2569 } else {
2570 seq_printf(seq,
4b7a4274 2571 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2572 state->dev->ifindex, state->dev->name,
b071195d
HH		 2573 &state->im->mca_addr,
2574 &psf->sf_addr,
1da177e4
LT		 2575 psf->sf_count[MCAST_INCLUDE],
2576 psf->sf_count[MCAST_EXCLUDE]);
2577 }
2578 return 0;
2579}
2580
56b3d975 2581static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2582 .start = igmp6_mcf_seq_start,
2583 .next = igmp6_mcf_seq_next,
2584 .stop = igmp6_mcf_seq_stop,
2585 .show = igmp6_mcf_seq_show,
2586};
2587
2588static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2589{
b8ad0cbc
DL		 2590 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2591 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2592}
2593
9a32144e 2594static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2595 .owner = THIS_MODULE,
2596 .open = igmp6_mcf_seq_open,
2597 .read = seq_read,
2598 .llseek = seq_lseek,
b8ad0cbc 2599 .release = seq_release_net,
1da177e4 2600};
ea82edf7 2601
2c8c1e72 2602static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 2603{
2604 int err;
2605
2606 err = -ENOMEM;
2607 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2608 goto out;
2609 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2610 &igmp6_mcf_seq_fops))
2611 goto out_proc_net_igmp6;
2612
2613 err = 0;
2614out:
2615 return err;
2616
2617out_proc_net_igmp6:
2618 proc_net_remove(net, "igmp6");
2619 goto out;
2620}
2621
2c8c1e72 2622static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7
DL		 2623{
2624 proc_net_remove(net, "mcfilter6");
2625 proc_net_remove(net, "igmp6");
2626}
2627#else
2c8c1e72 2628static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 2629{
2630 return 0;
2631}
2c8c1e72 2632static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2633{
ea82edf7 2634}
1da177e4
LT		 2635#endif
2636
2c8c1e72 2637static int __net_init igmp6_net_init(struct net *net)
1da177e4 2638{
1da177e4
LT		 2639 int err;
2640
1ed8516f
DL		 2641 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2642 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 2643 if (err < 0) {
2644 printk(KERN_ERR
2645 "Failed to initialize the IGMP6 control socket (err %d).\n",
2646 err);
b8ad0cbc 2647 goto out;
1da177e4
LT		 2648 }
2649
1ed8516f 2650 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2651
ea82edf7
DL		 2652 err = igmp6_proc_init(net);
2653 if (err)
b8ad0cbc 2654 goto out_sock_create;
b8ad0cbc
DL		 2655out:
2656 return err;
2657
2658out_sock_create:
1ed8516f 2659 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2660 goto out;
1da177e4
LT		 2661}
2662
2c8c1e72 2663static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2664{
1ed8516f 2665 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2666 igmp6_proc_exit(net);
1da177e4 2667}
b8ad0cbc
DL		 2668
2669static struct pernet_operations igmp6_net_ops = {
2670 .init = igmp6_net_init,
2671 .exit = igmp6_net_exit,
2672};
2673
2674int __init igmp6_init(void)
2675{
2676 return register_pernet_subsys(&igmp6_net_ops);
2677}
2678
2679void igmp6_cleanup(void)
2680{
2681 unregister_pernet_subsys(&igmp6_net_ops);
2682}
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