Merge tag 'rtc-4.4-3' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
[deliverable/linux.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>
9d4a0314 47#include <linux/pkt_sched.h>
6e7cb837 48#include <net/mld.h>
1da177e4
LT
49
50#include <linux/netfilter.h>
51#include <linux/netfilter_ipv6.h>
52
457c4cbc 53#include <net/net_namespace.h>
1da177e4
LT
54#include <net/sock.h>
55#include <net/snmp.h>
56
57#include <net/ipv6.h>
58#include <net/protocol.h>
59#include <net/if_inet6.h>
60#include <net/ndisc.h>
61#include <net/addrconf.h>
62#include <net/ip6_route.h>
1ed8516f 63#include <net/inet_common.h>
1da177e4
LT
64
65#include <net/ip6_checksum.h>
66
6e7cb837
YH
67/* Ensure that we have struct in6_addr aligned on 32bit word. */
68static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
69 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
70 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
71 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
1da177e4
LT
72};
73
74static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
75
1da177e4
LT
76static void igmp6_join_group(struct ifmcaddr6 *ma);
77static void igmp6_leave_group(struct ifmcaddr6 *ma);
78static void igmp6_timer_handler(unsigned long data);
79
80static void mld_gq_timer_expire(unsigned long data);
81static void mld_ifc_timer_expire(unsigned long data);
82static void mld_ifc_event(struct inet6_dev *idev);
83static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
b71d1d42 84static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
1da177e4 85static void mld_clear_delrec(struct inet6_dev *idev);
6c567b78 86static bool mld_in_v1_mode(const struct inet6_dev *idev);
1da177e4
LT
87static int sf_setstate(struct ifmcaddr6 *pmc);
88static void sf_markstate(struct ifmcaddr6 *pmc);
89static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
b71d1d42
ED
90static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
91 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4 92 int delta);
b71d1d42
ED
93static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
94 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT
95 int delta);
96static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
97 struct inet6_dev *idev);
98
1da177e4 99#define MLD_QRV_DEFAULT 2
89225d1c
DB
100/* RFC3810, 9.2. Query Interval */
101#define MLD_QI_DEFAULT (125 * HZ)
102/* RFC3810, 9.3. Query Response Interval */
103#define MLD_QRI_DEFAULT (10 * HZ)
1da177e4 104
9fd07841
DB
105/* RFC3810, 8.1 Query Version Distinctions */
106#define MLD_V1_QUERY_LEN 24
107#define MLD_V2_QUERY_LEN_MIN 28
108
6f4353d8 109#define IPV6_MLD_MAX_MSF 64
1da177e4 110
ab32ea5d 111int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
2f711939 112int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
1da177e4
LT
113
114/*
115 * socket join on multicast group
116 */
117
456b61bc
ED
118#define for_each_pmc_rcu(np, pmc) \
119 for (pmc = rcu_dereference(np->ipv6_mc_list); \
120 pmc != NULL; \
121 pmc = rcu_dereference(pmc->next))
122
fc4eba58
HFS
123static int unsolicited_report_interval(struct inet6_dev *idev)
124{
125 int iv;
126
6c567b78 127 if (mld_in_v1_mode(idev))
fc4eba58
HFS
128 iv = idev->cnf.mldv1_unsolicited_report_interval;
129 else
130 iv = idev->cnf.mldv2_unsolicited_report_interval;
131
132 return iv > 0 ? iv : 1;
133}
134
54ff9ef3 135int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT
136{
137 struct net_device *dev = NULL;
138 struct ipv6_mc_socklist *mc_lst;
139 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 140 struct net *net = sock_net(sk);
1da177e4
LT
141 int err;
142
46a4dee0
MC
143 ASSERT_RTNL();
144
1da177e4
LT
145 if (!ipv6_addr_is_multicast(addr))
146 return -EINVAL;
147
456b61bc
ED
148 rcu_read_lock();
149 for_each_pmc_rcu(np, mc_lst) {
c9e3e8b6
DS
150 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
151 ipv6_addr_equal(&mc_lst->addr, addr)) {
456b61bc 152 rcu_read_unlock();
c9e3e8b6
DS
153 return -EADDRINUSE;
154 }
155 }
456b61bc 156 rcu_read_unlock();
c9e3e8b6 157
1da177e4
LT
158 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
159
63159f29 160 if (!mc_lst)
1da177e4
LT
161 return -ENOMEM;
162
163 mc_lst->next = NULL;
4e3fd7a0 164 mc_lst->addr = *addr;
1da177e4
LT
165
166 if (ifindex == 0) {
167 struct rt6_info *rt;
b8ad0cbc 168 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4 169 if (rt) {
d1918542 170 dev = rt->dst.dev;
94e187c0 171 ip6_rt_put(rt);
1da177e4
LT
172 }
173 } else
414b6c94 174 dev = __dev_get_by_index(net, ifindex);
1da177e4 175
63159f29 176 if (!dev) {
1da177e4
LT
177 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
178 return -ENODEV;
179 }
180
181 mc_lst->ifindex = dev->ifindex;
182 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 183 rwlock_init(&mc_lst->sflock);
1da177e4
LT
184 mc_lst->sflist = NULL;
185
186 /*
187 * now add/increase the group membership on the device
188 */
189
190 err = ipv6_dev_mc_inc(dev, addr);
191
192 if (err) {
193 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
1da177e4
LT
194 return err;
195 }
196
1da177e4 197 mc_lst->next = np->ipv6_mc_list;
456b61bc 198 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
1da177e4 199
46a4dee0
MC
200 return 0;
201}
46a4dee0 202EXPORT_SYMBOL(ipv6_sock_mc_join);
1da177e4
LT
203
204/*
205 * socket leave on multicast group
206 */
54ff9ef3 207int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT
208{
209 struct ipv6_pinfo *np = inet6_sk(sk);
456b61bc
ED
210 struct ipv6_mc_socklist *mc_lst;
211 struct ipv6_mc_socklist __rcu **lnk;
3b1e0a65 212 struct net *net = sock_net(sk);
1da177e4 213
46a4dee0
MC
214 ASSERT_RTNL();
215
a858d64b
LW
216 if (!ipv6_addr_is_multicast(addr))
217 return -EINVAL;
218
456b61bc 219 for (lnk = &np->ipv6_mc_list;
b5350916 220 (mc_lst = rtnl_dereference(*lnk)) != NULL;
456b61bc 221 lnk = &mc_lst->next) {
1da177e4
LT
222 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
223 ipv6_addr_equal(&mc_lst->addr, addr)) {
224 struct net_device *dev;
225
226 *lnk = mc_lst->next;
1da177e4 227
414b6c94 228 dev = __dev_get_by_index(net, mc_lst->ifindex);
53b24b8f 229 if (dev) {
96b52e61 230 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 231
acd6e00b 232 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 233 if (idev)
1da177e4 234 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS
235 } else
236 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
a9ed4a29 237
456b61bc 238 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 239 kfree_rcu(mc_lst, rcu);
1da177e4
LT
240 return 0;
241 }
242 }
1da177e4 243
9951f036 244 return -EADDRNOTAVAIL;
1da177e4 245}
46a4dee0 246EXPORT_SYMBOL(ipv6_sock_mc_drop);
1da177e4 247
96b52e61
ED
248/* called with rcu_read_lock() */
249static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
b71d1d42 250 const struct in6_addr *group,
96b52e61 251 int ifindex)
1da177e4
LT
252{
253 struct net_device *dev = NULL;
254 struct inet6_dev *idev = NULL;
255
256 if (ifindex == 0) {
96b52e61 257 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4 258
1da177e4 259 if (rt) {
d1918542 260 dev = rt->dst.dev;
94e187c0 261 ip6_rt_put(rt);
1da177e4
LT
262 }
263 } else
96b52e61 264 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT
265
266 if (!dev)
96b52e61
ED
267 return NULL;
268 idev = __in6_dev_get(dev);
448eb71f 269 if (!idev)
8a22c99a 270 return NULL;
1da177e4 271 read_lock_bh(&idev->lock);
96b52e61
ED
272 if (idev->dead) {
273 read_unlock_bh(&idev->lock);
274 return NULL;
275 }
1da177e4
LT
276 return idev;
277}
278
279void ipv6_sock_mc_close(struct sock *sk)
280{
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 283 struct net *net = sock_net(sk);
1da177e4 284
0e1efe9d
ED
285 if (!rcu_access_pointer(np->ipv6_mc_list))
286 return;
287
a9ed4a29 288 rtnl_lock();
b5350916 289 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
1da177e4
LT
290 struct net_device *dev;
291
292 np->ipv6_mc_list = mc_lst->next;
1da177e4 293
414b6c94 294 dev = __dev_get_by_index(net, mc_lst->ifindex);
1da177e4 295 if (dev) {
96b52e61 296 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 297
acd6e00b 298 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 299 if (idev)
1da177e4 300 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS
301 } else
302 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4 303
456b61bc 304 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 305 kfree_rcu(mc_lst, rcu);
456b61bc 306
1da177e4 307 }
a9ed4a29 308 rtnl_unlock();
1da177e4
LT
309}
310
311int ip6_mc_source(int add, int omode, struct sock *sk,
312 struct group_source_req *pgsr)
313{
314 struct in6_addr *source, *group;
315 struct ipv6_mc_socklist *pmc;
1da177e4
LT
316 struct inet6_dev *idev;
317 struct ipv6_pinfo *inet6 = inet6_sk(sk);
318 struct ip6_sf_socklist *psl;
3b1e0a65 319 struct net *net = sock_net(sk);
1da177e4 320 int i, j, rv;
c9e3e8b6 321 int leavegroup = 0;
5ab4a6c8 322 int pmclocked = 0;
1da177e4
LT
323 int err;
324
1da177e4
LT
325 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
326 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
327
328 if (!ipv6_addr_is_multicast(group))
329 return -EINVAL;
330
96b52e61
ED
331 rcu_read_lock();
332 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
333 if (!idev) {
334 rcu_read_unlock();
1da177e4 335 return -ENODEV;
96b52e61 336 }
1da177e4
LT
337
338 err = -EADDRNOTAVAIL;
339
456b61bc 340 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT
341 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
342 continue;
343 if (ipv6_addr_equal(&pmc->addr, group))
344 break;
345 }
917f2f10
DS
346 if (!pmc) { /* must have a prior join */
347 err = -EINVAL;
1da177e4 348 goto done;
917f2f10 349 }
1da177e4
LT
350 /* if a source filter was set, must be the same mode as before */
351 if (pmc->sflist) {
917f2f10
DS
352 if (pmc->sfmode != omode) {
353 err = -EINVAL;
1da177e4 354 goto done;
917f2f10 355 }
1da177e4
LT
356 } else if (pmc->sfmode != omode) {
357 /* allow mode switches for empty-set filters */
358 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
359 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
360 pmc->sfmode = omode;
361 }
362
96b52e61 363 write_lock(&pmc->sflock);
5ab4a6c8
DS
364 pmclocked = 1;
365
1da177e4
LT
366 psl = pmc->sflist;
367 if (!add) {
368 if (!psl)
917f2f10 369 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 370 rv = !0;
67ba4152 371 for (i = 0; i < psl->sl_count; i++) {
07c2fecc 372 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
1da177e4
LT
373 if (rv == 0)
374 break;
375 }
376 if (rv) /* source not found */
917f2f10 377 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 378
c9e3e8b6
DS
379 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
380 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
381 leavegroup = 1;
382 goto done;
383 }
384
1da177e4
LT
385 /* update the interface filter */
386 ip6_mc_del_src(idev, group, omode, 1, source, 1);
387
67ba4152 388 for (j = i+1; j < psl->sl_count; j++)
1da177e4
LT
389 psl->sl_addr[j-1] = psl->sl_addr[j];
390 psl->sl_count--;
391 err = 0;
392 goto done;
393 }
394 /* else, add a new source to the filter */
395
396 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
397 err = -ENOBUFS;
398 goto done;
399 }
400 if (!psl || psl->sl_count == psl->sl_max) {
401 struct ip6_sf_socklist *newpsl;
402 int count = IP6_SFBLOCK;
403
404 if (psl)
405 count += psl->sl_max;
8b3a7005 406 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT
407 if (!newpsl) {
408 err = -ENOBUFS;
409 goto done;
410 }
411 newpsl->sl_max = count;
412 newpsl->sl_count = count - IP6_SFBLOCK;
413 if (psl) {
67ba4152 414 for (i = 0; i < psl->sl_count; i++)
1da177e4
LT
415 newpsl->sl_addr[i] = psl->sl_addr[i];
416 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
417 }
418 pmc->sflist = psl = newpsl;
419 }
420 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
67ba4152 421 for (i = 0; i < psl->sl_count; i++) {
07c2fecc 422 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
56db1c5f
JS
423 if (rv == 0) /* There is an error in the address. */
424 goto done;
1da177e4 425 }
67ba4152 426 for (j = psl->sl_count-1; j >= i; j--)
1da177e4
LT
427 psl->sl_addr[j+1] = psl->sl_addr[j];
428 psl->sl_addr[i] = *source;
429 psl->sl_count++;
430 err = 0;
431 /* update the interface list */
432 ip6_mc_add_src(idev, group, omode, 1, source, 1);
433done:
5ab4a6c8 434 if (pmclocked)
96b52e61 435 write_unlock(&pmc->sflock);
1da177e4 436 read_unlock_bh(&idev->lock);
96b52e61 437 rcu_read_unlock();
c9e3e8b6 438 if (leavegroup)
54ff9ef3 439 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT
440 return err;
441}
442
443int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
444{
b71d1d42 445 const struct in6_addr *group;
1da177e4 446 struct ipv6_mc_socklist *pmc;
1da177e4
LT
447 struct inet6_dev *idev;
448 struct ipv6_pinfo *inet6 = inet6_sk(sk);
449 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 450 struct net *net = sock_net(sk);
9951f036 451 int leavegroup = 0;
1da177e4
LT
452 int i, err;
453
454 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
455
456 if (!ipv6_addr_is_multicast(group))
457 return -EINVAL;
458 if (gsf->gf_fmode != MCAST_INCLUDE &&
459 gsf->gf_fmode != MCAST_EXCLUDE)
460 return -EINVAL;
461
96b52e61
ED
462 rcu_read_lock();
463 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 464
96b52e61
ED
465 if (!idev) {
466 rcu_read_unlock();
1da177e4 467 return -ENODEV;
96b52e61 468 }
1da177e4 469
9c05989b 470 err = 0;
5ab4a6c8 471
9951f036
DS
472 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
473 leavegroup = 1;
474 goto done;
475 }
476
456b61bc 477 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT
478 if (pmc->ifindex != gsf->gf_interface)
479 continue;
480 if (ipv6_addr_equal(&pmc->addr, group))
481 break;
482 }
917f2f10
DS
483 if (!pmc) { /* must have a prior join */
484 err = -EINVAL;
1da177e4 485 goto done;
917f2f10 486 }
1da177e4 487 if (gsf->gf_numsrc) {
8b3a7005
KK
488 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
489 GFP_ATOMIC);
1da177e4
LT
490 if (!newpsl) {
491 err = -ENOBUFS;
492 goto done;
493 }
494 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
67ba4152 495 for (i = 0; i < newpsl->sl_count; ++i) {
1da177e4
LT
496 struct sockaddr_in6 *psin6;
497
498 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
499 newpsl->sl_addr[i] = psin6->sin6_addr;
500 }
501 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
502 newpsl->sl_count, newpsl->sl_addr, 0);
503 if (err) {
504 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
505 goto done;
506 }
8713dbf0 507 } else {
1da177e4 508 newpsl = NULL;
8713dbf0
YZ
509 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
510 }
5ab4a6c8 511
96b52e61 512 write_lock(&pmc->sflock);
1da177e4
LT
513 psl = pmc->sflist;
514 if (psl) {
515 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
516 psl->sl_count, psl->sl_addr, 0);
517 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
518 } else
519 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
520 pmc->sflist = newpsl;
521 pmc->sfmode = gsf->gf_fmode;
96b52e61 522 write_unlock(&pmc->sflock);
917f2f10 523 err = 0;
1da177e4
LT
524done:
525 read_unlock_bh(&idev->lock);
96b52e61 526 rcu_read_unlock();
9951f036
DS
527 if (leavegroup)
528 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT
529 return err;
530}
531
532int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
533 struct group_filter __user *optval, int __user *optlen)
534{
535 int err, i, count, copycount;
b71d1d42 536 const struct in6_addr *group;
1da177e4
LT
537 struct ipv6_mc_socklist *pmc;
538 struct inet6_dev *idev;
1da177e4
LT
539 struct ipv6_pinfo *inet6 = inet6_sk(sk);
540 struct ip6_sf_socklist *psl;
3b1e0a65 541 struct net *net = sock_net(sk);
1da177e4
LT
542
543 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
544
545 if (!ipv6_addr_is_multicast(group))
546 return -EINVAL;
547
96b52e61
ED
548 rcu_read_lock();
549 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 550
96b52e61
ED
551 if (!idev) {
552 rcu_read_unlock();
1da177e4 553 return -ENODEV;
96b52e61 554 }
1da177e4
LT
555
556 err = -EADDRNOTAVAIL;
f7ed925c
WC
557 /* changes to the ipv6_mc_list require the socket lock and
558 * rtnl lock. We have the socket lock and rcu read lock,
5ab4a6c8
DS
559 * so reading the list is safe.
560 */
1da177e4 561
456b61bc 562 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT
563 if (pmc->ifindex != gsf->gf_interface)
564 continue;
565 if (ipv6_addr_equal(group, &pmc->addr))
566 break;
567 }
568 if (!pmc) /* must have a prior join */
569 goto done;
570 gsf->gf_fmode = pmc->sfmode;
571 psl = pmc->sflist;
572 count = psl ? psl->sl_count : 0;
573 read_unlock_bh(&idev->lock);
96b52e61 574 rcu_read_unlock();
1da177e4
LT
575
576 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
577 gsf->gf_numsrc = count;
578 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
579 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
580 return -EFAULT;
581 }
f7ed925c
WC
582 /* changes to psl require the socket lock, and a write lock
583 * on pmc->sflock. We have the socket lock so reading here is safe.
5ab4a6c8 584 */
67ba4152 585 for (i = 0; i < copycount; i++) {
1da177e4
LT
586 struct sockaddr_in6 *psin6;
587 struct sockaddr_storage ss;
588
589 psin6 = (struct sockaddr_in6 *)&ss;
590 memset(&ss, 0, sizeof(ss));
591 psin6->sin6_family = AF_INET6;
592 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 593 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT
594 return -EFAULT;
595 }
596 return 0;
597done:
598 read_unlock_bh(&idev->lock);
96b52e61 599 rcu_read_unlock();
1da177e4
LT
600 return err;
601}
602
a50feda5
ED
603bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
604 const struct in6_addr *src_addr)
1da177e4
LT
605{
606 struct ipv6_pinfo *np = inet6_sk(sk);
607 struct ipv6_mc_socklist *mc;
608 struct ip6_sf_socklist *psl;
a50feda5 609 bool rv = true;
1da177e4 610
456b61bc
ED
611 rcu_read_lock();
612 for_each_pmc_rcu(np, mc) {
1da177e4
LT
613 if (ipv6_addr_equal(&mc->addr, mc_addr))
614 break;
615 }
616 if (!mc) {
456b61bc 617 rcu_read_unlock();
a50feda5 618 return true;
1da177e4 619 }
5ab4a6c8 620 read_lock(&mc->sflock);
1da177e4
LT
621 psl = mc->sflist;
622 if (!psl) {
623 rv = mc->sfmode == MCAST_EXCLUDE;
624 } else {
625 int i;
626
67ba4152 627 for (i = 0; i < psl->sl_count; i++) {
1da177e4
LT
628 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
629 break;
630 }
631 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
a50feda5 632 rv = false;
1da177e4 633 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
a50feda5 634 rv = false;
1da177e4 635 }
5ab4a6c8 636 read_unlock(&mc->sflock);
456b61bc 637 rcu_read_unlock();
1da177e4
LT
638
639 return rv;
640}
641
1da177e4
LT
642static void igmp6_group_added(struct ifmcaddr6 *mc)
643{
644 struct net_device *dev = mc->idev->dev;
645 char buf[MAX_ADDR_LEN];
646
ec16ef22
YH
647 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
648 IPV6_ADDR_SCOPE_LINKLOCAL)
649 return;
650
1da177e4
LT
651 spin_lock_bh(&mc->mca_lock);
652 if (!(mc->mca_flags&MAF_LOADED)) {
653 mc->mca_flags |= MAF_LOADED;
654 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 655 dev_mc_add(dev, buf);
1da177e4
LT
656 }
657 spin_unlock_bh(&mc->mca_lock);
658
659 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
660 return;
661
6c567b78 662 if (mld_in_v1_mode(mc->idev)) {
1da177e4
LT
663 igmp6_join_group(mc);
664 return;
665 }
666 /* else v2 */
667
668 mc->mca_crcount = mc->idev->mc_qrv;
669 mld_ifc_event(mc->idev);
670}
671
672static void igmp6_group_dropped(struct ifmcaddr6 *mc)
673{
674 struct net_device *dev = mc->idev->dev;
675 char buf[MAX_ADDR_LEN];
676
ec16ef22
YH
677 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
678 IPV6_ADDR_SCOPE_LINKLOCAL)
679 return;
680
1da177e4
LT
681 spin_lock_bh(&mc->mca_lock);
682 if (mc->mca_flags&MAF_LOADED) {
683 mc->mca_flags &= ~MAF_LOADED;
684 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 685 dev_mc_del(dev, buf);
1da177e4
LT
686 }
687
688 if (mc->mca_flags & MAF_NOREPORT)
689 goto done;
690 spin_unlock_bh(&mc->mca_lock);
691
692 if (!mc->idev->dead)
693 igmp6_leave_group(mc);
694
695 spin_lock_bh(&mc->mca_lock);
696 if (del_timer(&mc->mca_timer))
697 atomic_dec(&mc->mca_refcnt);
698done:
699 ip6_mc_clear_src(mc);
700 spin_unlock_bh(&mc->mca_lock);
701}
702
703/*
704 * deleted ifmcaddr6 manipulation
705 */
706static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
707{
708 struct ifmcaddr6 *pmc;
709
710 /* this is an "ifmcaddr6" for convenience; only the fields below
711 * are actually used. In particular, the refcnt and users are not
712 * used for management of the delete list. Using the same structure
713 * for deleted items allows change reports to use common code with
714 * non-deleted or query-response MCA's.
715 */
0c600eda 716 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT
717 if (!pmc)
718 return;
0c600eda 719
1da177e4
LT
720 spin_lock_bh(&im->mca_lock);
721 spin_lock_init(&pmc->mca_lock);
722 pmc->idev = im->idev;
723 in6_dev_hold(idev);
724 pmc->mca_addr = im->mca_addr;
725 pmc->mca_crcount = idev->mc_qrv;
726 pmc->mca_sfmode = im->mca_sfmode;
727 if (pmc->mca_sfmode == MCAST_INCLUDE) {
728 struct ip6_sf_list *psf;
729
730 pmc->mca_tomb = im->mca_tomb;
731 pmc->mca_sources = im->mca_sources;
732 im->mca_tomb = im->mca_sources = NULL;
67ba4152 733 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
1da177e4
LT
734 psf->sf_crcount = pmc->mca_crcount;
735 }
736 spin_unlock_bh(&im->mca_lock);
737
6457d26b 738 spin_lock_bh(&idev->mc_lock);
1da177e4
LT
739 pmc->next = idev->mc_tomb;
740 idev->mc_tomb = pmc;
6457d26b 741 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT
742}
743
b71d1d42 744static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
1da177e4
LT
745{
746 struct ifmcaddr6 *pmc, *pmc_prev;
747 struct ip6_sf_list *psf, *psf_next;
748
6457d26b 749 spin_lock_bh(&idev->mc_lock);
1da177e4 750 pmc_prev = NULL;
67ba4152 751 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
1da177e4
LT
752 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
753 break;
754 pmc_prev = pmc;
755 }
756 if (pmc) {
757 if (pmc_prev)
758 pmc_prev->next = pmc->next;
759 else
760 idev->mc_tomb = pmc->next;
761 }
6457d26b
SH
762 spin_unlock_bh(&idev->mc_lock);
763
1da177e4 764 if (pmc) {
67ba4152 765 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
1da177e4
LT
766 psf_next = psf->sf_next;
767 kfree(psf);
768 }
769 in6_dev_put(pmc->idev);
770 kfree(pmc);
771 }
772}
773
774static void mld_clear_delrec(struct inet6_dev *idev)
775{
776 struct ifmcaddr6 *pmc, *nextpmc;
777
6457d26b 778 spin_lock_bh(&idev->mc_lock);
1da177e4
LT
779 pmc = idev->mc_tomb;
780 idev->mc_tomb = NULL;
6457d26b 781 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT
782
783 for (; pmc; pmc = nextpmc) {
784 nextpmc = pmc->next;
785 ip6_mc_clear_src(pmc);
786 in6_dev_put(pmc->idev);
787 kfree(pmc);
788 }
789
790 /* clear dead sources, too */
791 read_lock_bh(&idev->lock);
67ba4152 792 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT
793 struct ip6_sf_list *psf, *psf_next;
794
795 spin_lock_bh(&pmc->mca_lock);
796 psf = pmc->mca_tomb;
797 pmc->mca_tomb = NULL;
798 spin_unlock_bh(&pmc->mca_lock);
67ba4152 799 for (; psf; psf = psf_next) {
1da177e4
LT
800 psf_next = psf->sf_next;
801 kfree(psf);
802 }
803 }
804 read_unlock_bh(&idev->lock);
805}
806
1691c63e
WC
807static void mca_get(struct ifmcaddr6 *mc)
808{
809 atomic_inc(&mc->mca_refcnt);
810}
811
812static void ma_put(struct ifmcaddr6 *mc)
813{
814 if (atomic_dec_and_test(&mc->mca_refcnt)) {
815 in6_dev_put(mc->idev);
816 kfree(mc);
817 }
818}
819
820static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
821 const struct in6_addr *addr)
822{
823 struct ifmcaddr6 *mc;
824
825 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
63159f29 826 if (!mc)
1691c63e
WC
827 return NULL;
828
829 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
830
831 mc->mca_addr = *addr;
832 mc->idev = idev; /* reference taken by caller */
833 mc->mca_users = 1;
834 /* mca_stamp should be updated upon changes */
835 mc->mca_cstamp = mc->mca_tstamp = jiffies;
836 atomic_set(&mc->mca_refcnt, 1);
837 spin_lock_init(&mc->mca_lock);
838
839 /* initial mode is (EX, empty) */
840 mc->mca_sfmode = MCAST_EXCLUDE;
841 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
842
843 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
844 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
845 mc->mca_flags |= MAF_NOREPORT;
846
847 return mc;
848}
1da177e4
LT
849
850/*
851 * device multicast group inc (add if not found)
852 */
9acd9f3a 853int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT
854{
855 struct ifmcaddr6 *mc;
856 struct inet6_dev *idev;
857
a9ed4a29
SD
858 ASSERT_RTNL();
859
96b52e61 860 /* we need to take a reference on idev */
1da177e4
LT
861 idev = in6_dev_get(dev);
862
63159f29 863 if (!idev)
1da177e4
LT
864 return -EINVAL;
865
866 write_lock_bh(&idev->lock);
867 if (idev->dead) {
868 write_unlock_bh(&idev->lock);
869 in6_dev_put(idev);
870 return -ENODEV;
871 }
872
873 for (mc = idev->mc_list; mc; mc = mc->next) {
874 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
875 mc->mca_users++;
876 write_unlock_bh(&idev->lock);
877 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
878 NULL, 0);
879 in6_dev_put(idev);
880 return 0;
881 }
882 }
883
1691c63e
WC
884 mc = mca_alloc(idev, addr);
885 if (!mc) {
1da177e4
LT
886 write_unlock_bh(&idev->lock);
887 in6_dev_put(idev);
888 return -ENOMEM;
889 }
890
1da177e4
LT
891 mc->next = idev->mc_list;
892 idev->mc_list = mc;
1691c63e
WC
893
894 /* Hold this for the code below before we unlock,
895 * it is already exposed via idev->mc_list.
896 */
897 mca_get(mc);
1da177e4
LT
898 write_unlock_bh(&idev->lock);
899
900 mld_del_delrec(idev, &mc->mca_addr);
901 igmp6_group_added(mc);
902 ma_put(mc);
903 return 0;
904}
905
906/*
907 * device multicast group del
908 */
9acd9f3a 909int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT
910{
911 struct ifmcaddr6 *ma, **map;
912
a9ed4a29
SD
913 ASSERT_RTNL();
914
1da177e4 915 write_lock_bh(&idev->lock);
67ba4152 916 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
1da177e4
LT
917 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
918 if (--ma->mca_users == 0) {
919 *map = ma->next;
920 write_unlock_bh(&idev->lock);
921
922 igmp6_group_dropped(ma);
923
924 ma_put(ma);
925 return 0;
926 }
927 write_unlock_bh(&idev->lock);
928 return 0;
929 }
930 }
931 write_unlock_bh(&idev->lock);
932
933 return -ENOENT;
934}
935
9acd9f3a 936int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4 937{
96b52e61 938 struct inet6_dev *idev;
1da177e4
LT
939 int err;
940
414b6c94 941 ASSERT_RTNL();
1da177e4 942
96b52e61
ED
943 idev = __in6_dev_get(dev);
944 if (!idev)
945 err = -ENODEV;
946 else
947 err = __ipv6_dev_mc_dec(idev, addr);
1da177e4
LT
948
949 return err;
950}
951
1da177e4
LT
952/*
953 * check if the interface/address pair is valid
954 */
a50feda5
ED
955bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
956 const struct in6_addr *src_addr)
1da177e4
LT
957{
958 struct inet6_dev *idev;
959 struct ifmcaddr6 *mc;
a50feda5 960 bool rv = false;
1da177e4 961
96b52e61
ED
962 rcu_read_lock();
963 idev = __in6_dev_get(dev);
1da177e4
LT
964 if (idev) {
965 read_lock_bh(&idev->lock);
67ba4152 966 for (mc = idev->mc_list; mc; mc = mc->next) {
1da177e4
LT
967 if (ipv6_addr_equal(&mc->mca_addr, group))
968 break;
969 }
970 if (mc) {
971 if (src_addr && !ipv6_addr_any(src_addr)) {
972 struct ip6_sf_list *psf;
973
974 spin_lock_bh(&mc->mca_lock);
67ba4152 975 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT
976 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
977 break;
978 }
979 if (psf)
980 rv = psf->sf_count[MCAST_INCLUDE] ||
981 psf->sf_count[MCAST_EXCLUDE] !=
982 mc->mca_sfcount[MCAST_EXCLUDE];
983 else
67ba4152 984 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1da177e4
LT
985 spin_unlock_bh(&mc->mca_lock);
986 } else
a50feda5 987 rv = true; /* don't filter unspecified source */
1da177e4
LT
988 }
989 read_unlock_bh(&idev->lock);
1da177e4 990 }
96b52e61 991 rcu_read_unlock();
1da177e4
LT
992 return rv;
993}
994
995static void mld_gq_start_timer(struct inet6_dev *idev)
996{
63862b5b 997 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1da177e4
LT
998
999 idev->mc_gq_running = 1;
1000 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1001 in6_dev_hold(idev);
1002}
1003
b4af8def
DB
1004static void mld_gq_stop_timer(struct inet6_dev *idev)
1005{
1006 idev->mc_gq_running = 0;
1007 if (del_timer(&idev->mc_gq_timer))
1008 __in6_dev_put(idev);
1009}
1010
c2cef4e8 1011static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1da177e4 1012{
63862b5b 1013 unsigned long tv = prandom_u32() % delay;
1da177e4
LT
1014
1015 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1016 in6_dev_hold(idev);
1017}
1018
b4af8def
DB
1019static void mld_ifc_stop_timer(struct inet6_dev *idev)
1020{
1021 idev->mc_ifc_count = 0;
1022 if (del_timer(&idev->mc_ifc_timer))
1023 __in6_dev_put(idev);
1024}
1025
c2cef4e8 1026static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
b173ee48 1027{
63862b5b 1028 unsigned long tv = prandom_u32() % delay;
b173ee48
HFS
1029
1030 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1031 in6_dev_hold(idev);
1032}
1033
b4af8def
DB
1034static void mld_dad_stop_timer(struct inet6_dev *idev)
1035{
1036 if (del_timer(&idev->mc_dad_timer))
1037 __in6_dev_put(idev);
1038}
1039
1da177e4
LT
1040/*
1041 * IGMP handling (alias multicast ICMPv6 messages)
1042 */
1043
1044static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1045{
1046 unsigned long delay = resptime;
1047
1048 /* Do not start timer for these addresses */
1049 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1050 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1051 return;
1052
1053 if (del_timer(&ma->mca_timer)) {
1054 atomic_dec(&ma->mca_refcnt);
1055 delay = ma->mca_timer.expires - jiffies;
1056 }
1057
cc7f7ab7 1058 if (delay >= resptime)
63862b5b 1059 delay = prandom_u32() % resptime;
cc7f7ab7 1060
1da177e4
LT
1061 ma->mca_timer.expires = jiffies + delay;
1062 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1063 atomic_inc(&ma->mca_refcnt);
1064 ma->mca_flags |= MAF_TIMER_RUNNING;
1065}
1066
5ab4a6c8 1067/* mark EXCLUDE-mode sources */
a50feda5
ED
1068static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1069 const struct in6_addr *srcs)
1da177e4
LT
1070{
1071 struct ip6_sf_list *psf;
1072 int i, scount;
1073
1074 scount = 0;
67ba4152 1075 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT
1076 if (scount == nsrcs)
1077 break;
67ba4152 1078 for (i = 0; i < nsrcs; i++) {
5ab4a6c8 1079 /* skip inactive filters */
e05c4ad3 1080 if (psf->sf_count[MCAST_INCLUDE] ||
5ab4a6c8
DS
1081 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1082 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 1083 break;
5ab4a6c8
DS
1084 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1085 scount++;
1086 break;
1087 }
1088 }
1089 }
1090 pmc->mca_flags &= ~MAF_GSQUERY;
1091 if (scount == nsrcs) /* all sources excluded */
a50feda5
ED
1092 return false;
1093 return true;
5ab4a6c8
DS
1094}
1095
a50feda5
ED
1096static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1097 const struct in6_addr *srcs)
5ab4a6c8
DS
1098{
1099 struct ip6_sf_list *psf;
1100 int i, scount;
1101
1102 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1103 return mld_xmarksources(pmc, nsrcs, srcs);
1104
1105 /* mark INCLUDE-mode sources */
1106
1107 scount = 0;
67ba4152 1108 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
5ab4a6c8
DS
1109 if (scount == nsrcs)
1110 break;
67ba4152 1111 for (i = 0; i < nsrcs; i++) {
1da177e4
LT
1112 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1113 psf->sf_gsresp = 1;
1114 scount++;
1115 break;
1116 }
5ab4a6c8
DS
1117 }
1118 }
1119 if (!scount) {
1120 pmc->mca_flags &= ~MAF_GSQUERY;
a50feda5 1121 return false;
1da177e4 1122 }
5ab4a6c8 1123 pmc->mca_flags |= MAF_GSQUERY;
a50feda5 1124 return true;
1da177e4
LT
1125}
1126
58c0ecfd
DB
1127static int mld_force_mld_version(const struct inet6_dev *idev)
1128{
1129 /* Normally, both are 0 here. If enforcement to a particular is
1130 * being used, individual device enforcement will have a lower
1131 * precedence over 'all' device (.../conf/all/force_mld_version).
1132 */
1133
1134 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1135 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1136 else
1137 return idev->cnf.force_mld_version;
1138}
1139
1140static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1141{
1142 return mld_force_mld_version(idev) == 2;
1143}
1144
1145static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1146{
1147 return mld_force_mld_version(idev) == 1;
1148}
1149
6c567b78
DB
1150static bool mld_in_v1_mode(const struct inet6_dev *idev)
1151{
58c0ecfd
DB
1152 if (mld_in_v2_mode_only(idev))
1153 return false;
1154 if (mld_in_v1_mode_only(idev))
6c567b78
DB
1155 return true;
1156 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1157 return true;
1158
1159 return false;
1160}
1161
89225d1c
DB
1162static void mld_set_v1_mode(struct inet6_dev *idev)
1163{
1164 /* RFC3810, relevant sections:
1165 * - 9.1. Robustness Variable
1166 * - 9.2. Query Interval
1167 * - 9.3. Query Response Interval
1168 * - 9.12. Older Version Querier Present Timeout
1169 */
1170 unsigned long switchback;
1171
1172 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1173
1174 idev->mc_v1_seen = jiffies + switchback;
1175}
1176
1177static void mld_update_qrv(struct inet6_dev *idev,
1178 const struct mld2_query *mlh2)
1179{
1180 /* RFC3810, relevant sections:
1181 * - 5.1.8. QRV (Querier's Robustness Variable)
1182 * - 9.1. Robustness Variable
1183 */
1184
1185 /* The value of the Robustness Variable MUST NOT be zero,
1186 * and SHOULD NOT be one. Catch this here if we ever run
1187 * into such a case in future.
1188 */
2f711939 1189 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
89225d1c
DB
1190 WARN_ON(idev->mc_qrv == 0);
1191
1192 if (mlh2->mld2q_qrv > 0)
1193 idev->mc_qrv = mlh2->mld2q_qrv;
1194
2f711939 1195 if (unlikely(idev->mc_qrv < min_qrv)) {
89225d1c 1196 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
2f711939
HFS
1197 idev->mc_qrv, min_qrv);
1198 idev->mc_qrv = min_qrv;
89225d1c
DB
1199 }
1200}
1201
1202static void mld_update_qi(struct inet6_dev *idev,
1203 const struct mld2_query *mlh2)
1204{
1205 /* RFC3810, relevant sections:
1206 * - 5.1.9. QQIC (Querier's Query Interval Code)
1207 * - 9.2. Query Interval
1208 * - 9.12. Older Version Querier Present Timeout
1209 * (the [Query Interval] in the last Query received)
1210 */
1211 unsigned long mc_qqi;
1212
1213 if (mlh2->mld2q_qqic < 128) {
1214 mc_qqi = mlh2->mld2q_qqic;
1215 } else {
1216 unsigned long mc_man, mc_exp;
1217
1218 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1219 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1220
1221 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1222 }
1223
1224 idev->mc_qi = mc_qqi * HZ;
1225}
1226
1227static void mld_update_qri(struct inet6_dev *idev,
1228 const struct mld2_query *mlh2)
1229{
1230 /* RFC3810, relevant sections:
1231 * - 5.1.3. Maximum Response Code
1232 * - 9.3. Query Response Interval
1233 */
e3f5b170 1234 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
89225d1c
DB
1235}
1236
2b7c121f 1237static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
35f7aa53 1238 unsigned long *max_delay, bool v1_query)
2b7c121f
DB
1239{
1240 unsigned long mldv1_md;
1241
1242 /* Ignore v1 queries */
1243 if (mld_in_v2_mode_only(idev))
1244 return -EINVAL;
1245
2b7c121f 1246 mldv1_md = ntohs(mld->mld_maxdelay);
35f7aa53
DB
1247
1248 /* When in MLDv1 fallback and a MLDv2 router start-up being
1249 * unaware of current MLDv1 operation, the MRC == MRD mapping
1250 * only works when the exponential algorithm is not being
1251 * used (as MLDv1 is unaware of such things).
1252 *
1253 * According to the RFC author, the MLDv2 implementations
1254 * he's aware of all use a MRC < 32768 on start up queries.
1255 *
1256 * Thus, should we *ever* encounter something else larger
1257 * than that, just assume the maximum possible within our
1258 * reach.
1259 */
1260 if (!v1_query)
1261 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1262
2b7c121f
DB
1263 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1264
35f7aa53
DB
1265 /* MLDv1 router present: we need to go into v1 mode *only*
1266 * when an MLDv1 query is received as per section 9.12. of
1267 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1268 * queries MUST be of exactly 24 octets.
1269 */
1270 if (v1_query)
1271 mld_set_v1_mode(idev);
2b7c121f
DB
1272
1273 /* cancel MLDv2 report timer */
b4af8def 1274 mld_gq_stop_timer(idev);
2b7c121f 1275 /* cancel the interface change timer */
b4af8def 1276 mld_ifc_stop_timer(idev);
2b7c121f
DB
1277 /* clear deleted report items */
1278 mld_clear_delrec(idev);
1279
1280 return 0;
1281}
1282
1283static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1284 unsigned long *max_delay)
1285{
2b7c121f
DB
1286 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1287
1288 mld_update_qrv(idev, mld);
1289 mld_update_qi(idev, mld);
1290 mld_update_qri(idev, mld);
1291
1292 idev->mc_maxdelay = *max_delay;
1293
1294 return 0;
1295}
1296
96b52e61 1297/* called with rcu_read_lock() */
1da177e4
LT
1298int igmp6_event_query(struct sk_buff *skb)
1299{
97300b5f 1300 struct mld2_query *mlh2 = NULL;
1da177e4 1301 struct ifmcaddr6 *ma;
b71d1d42 1302 const struct in6_addr *group;
1da177e4
LT
1303 unsigned long max_delay;
1304 struct inet6_dev *idev;
6e7cb837 1305 struct mld_msg *mld;
1da177e4
LT
1306 int group_type;
1307 int mark = 0;
2b7c121f 1308 int len, err;
1da177e4
LT
1309
1310 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1311 return -EINVAL;
1312
1313 /* compute payload length excluding extension headers */
0660e03f 1314 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1315 len -= skb_network_header_len(skb);
1da177e4 1316
e940f5d6
HL
1317 /* RFC3810 6.2
1318 * Upon reception of an MLD message that contains a Query, the node
1319 * checks if the source address of the message is a valid link-local
1320 * address, if the Hop Limit is set to 1, and if the Router Alert
1321 * option is present in the Hop-By-Hop Options header of the IPv6
1322 * packet. If any of these checks fails, the packet is dropped.
1323 */
1324 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1325 ipv6_hdr(skb)->hop_limit != 1 ||
1326 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1327 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1da177e4
LT
1328 return -EINVAL;
1329
96b52e61 1330 idev = __in6_dev_get(skb->dev);
63159f29 1331 if (!idev)
1da177e4
LT
1332 return 0;
1333
6e7cb837
YH
1334 mld = (struct mld_msg *)icmp6_hdr(skb);
1335 group = &mld->mld_mca;
1da177e4
LT
1336 group_type = ipv6_addr_type(group);
1337
1338 if (group_type != IPV6_ADDR_ANY &&
96b52e61 1339 !(group_type&IPV6_ADDR_MULTICAST))
1da177e4 1340 return -EINVAL;
1da177e4 1341
35f7aa53
DB
1342 if (len < MLD_V1_QUERY_LEN) {
1343 return -EINVAL;
1344 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1345 err = mld_process_v1(idev, mld, &max_delay,
1346 len == MLD_V1_QUERY_LEN);
2b7c121f
DB
1347 if (err < 0)
1348 return err;
9fd07841 1349 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1ab1457c 1350 int srcs_offset = sizeof(struct mld2_query) -
97300b5f 1351 sizeof(struct icmp6hdr);
89225d1c 1352
96b52e61 1353 if (!pskb_may_pull(skb, srcs_offset))
97300b5f 1354 return -EINVAL;
96b52e61 1355
9c70220b 1356 mlh2 = (struct mld2_query *)skb_transport_header(skb);
84698963 1357
2b7c121f
DB
1358 err = mld_process_v2(idev, mlh2, &max_delay);
1359 if (err < 0)
1360 return err;
89225d1c 1361
1da177e4 1362 if (group_type == IPV6_ADDR_ANY) { /* general query */
96b52e61 1363 if (mlh2->mld2q_nsrcs)
1da177e4 1364 return -EINVAL; /* no sources allowed */
96b52e61 1365
1da177e4 1366 mld_gq_start_timer(idev);
1da177e4
LT
1367 return 0;
1368 }
1369 /* mark sources to include, if group & source-specific */
6e7cb837 1370 if (mlh2->mld2q_nsrcs != 0) {
1ab1457c 1371 if (!pskb_may_pull(skb, srcs_offset +
96b52e61 1372 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
97300b5f 1373 return -EINVAL;
96b52e61 1374
9c70220b 1375 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ
1376 mark = 1;
1377 }
35f7aa53 1378 } else {
1da177e4 1379 return -EINVAL;
35f7aa53 1380 }
1da177e4
LT
1381
1382 read_lock_bh(&idev->lock);
1383 if (group_type == IPV6_ADDR_ANY) {
67ba4152 1384 for (ma = idev->mc_list; ma; ma = ma->next) {
1da177e4
LT
1385 spin_lock_bh(&ma->mca_lock);
1386 igmp6_group_queried(ma, max_delay);
1387 spin_unlock_bh(&ma->mca_lock);
1388 }
1389 } else {
67ba4152 1390 for (ma = idev->mc_list; ma; ma = ma->next) {
7add2a43 1391 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT
1392 continue;
1393 spin_lock_bh(&ma->mca_lock);
1394 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1395 /* gsquery <- gsquery && mark */
1396 if (!mark)
1397 ma->mca_flags &= ~MAF_GSQUERY;
1398 } else {
1399 /* gsquery <- mark */
1400 if (mark)
1401 ma->mca_flags |= MAF_GSQUERY;
1402 else
1403 ma->mca_flags &= ~MAF_GSQUERY;
1404 }
5ab4a6c8 1405 if (!(ma->mca_flags & MAF_GSQUERY) ||
6e7cb837 1406 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
5ab4a6c8 1407 igmp6_group_queried(ma, max_delay);
1da177e4 1408 spin_unlock_bh(&ma->mca_lock);
7add2a43 1409 break;
1da177e4
LT
1410 }
1411 }
1412 read_unlock_bh(&idev->lock);
1da177e4
LT
1413
1414 return 0;
1415}
1416
96b52e61 1417/* called with rcu_read_lock() */
1da177e4
LT
1418int igmp6_event_report(struct sk_buff *skb)
1419{
1420 struct ifmcaddr6 *ma;
1da177e4 1421 struct inet6_dev *idev;
6e7cb837 1422 struct mld_msg *mld;
1da177e4
LT
1423 int addr_type;
1424
1425 /* Our own report looped back. Ignore it. */
1426 if (skb->pkt_type == PACKET_LOOPBACK)
1427 return 0;
1428
24c69275
DS
1429 /* send our report if the MC router may not have heard this report */
1430 if (skb->pkt_type != PACKET_MULTICAST &&
1431 skb->pkt_type != PACKET_BROADCAST)
1432 return 0;
1433
6e7cb837 1434 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1da177e4
LT
1435 return -EINVAL;
1436
6e7cb837 1437 mld = (struct mld_msg *)icmp6_hdr(skb);
1da177e4
LT
1438
1439 /* Drop reports with not link local source */
0660e03f 1440 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1441 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT
1442 !(addr_type&IPV6_ADDR_LINKLOCAL))
1443 return -EINVAL;
1444
96b52e61 1445 idev = __in6_dev_get(skb->dev);
63159f29 1446 if (!idev)
1da177e4
LT
1447 return -ENODEV;
1448
1449 /*
1450 * Cancel the timer for this group
1451 */
1452
1453 read_lock_bh(&idev->lock);
67ba4152 1454 for (ma = idev->mc_list; ma; ma = ma->next) {
6e7cb837 1455 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1da177e4
LT
1456 spin_lock(&ma->mca_lock);
1457 if (del_timer(&ma->mca_timer))
1458 atomic_dec(&ma->mca_refcnt);
1459 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1460 spin_unlock(&ma->mca_lock);
1461 break;
1462 }
1463 }
1464 read_unlock_bh(&idev->lock);
1da177e4
LT
1465 return 0;
1466}
1467
a50feda5
ED
1468static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1469 int gdeleted, int sdeleted)
1da177e4
LT
1470{
1471 switch (type) {
1472 case MLD2_MODE_IS_INCLUDE:
1473 case MLD2_MODE_IS_EXCLUDE:
1474 if (gdeleted || sdeleted)
a50feda5 1475 return false;
5ab4a6c8
DS
1476 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1477 if (pmc->mca_sfmode == MCAST_INCLUDE)
a50feda5 1478 return true;
5ab4a6c8
DS
1479 /* don't include if this source is excluded
1480 * in all filters
1481 */
1482 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1483 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS
1484 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1485 psf->sf_count[MCAST_EXCLUDE];
1486 }
a50feda5 1487 return false;
1da177e4
LT
1488 case MLD2_CHANGE_TO_INCLUDE:
1489 if (gdeleted || sdeleted)
a50feda5 1490 return false;
1da177e4
LT
1491 return psf->sf_count[MCAST_INCLUDE] != 0;
1492 case MLD2_CHANGE_TO_EXCLUDE:
1493 if (gdeleted || sdeleted)
a50feda5 1494 return false;
1da177e4
LT
1495 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1496 psf->sf_count[MCAST_INCLUDE])
a50feda5 1497 return false;
1da177e4
LT
1498 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1499 psf->sf_count[MCAST_EXCLUDE];
1500 case MLD2_ALLOW_NEW_SOURCES:
1501 if (gdeleted || !psf->sf_crcount)
a50feda5 1502 return false;
1da177e4
LT
1503 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1504 case MLD2_BLOCK_OLD_SOURCES:
1505 if (pmc->mca_sfmode == MCAST_INCLUDE)
1506 return gdeleted || (psf->sf_crcount && sdeleted);
1507 return psf->sf_crcount && !gdeleted && !sdeleted;
1508 }
a50feda5 1509 return false;
1da177e4
LT
1510}
1511
1512static int
1513mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1514{
1515 struct ip6_sf_list *psf;
1516 int scount = 0;
1517
67ba4152 1518 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT
1519 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1520 continue;
1521 scount++;
1522 }
1523 return scount;
1524}
1525
2576f17d
YH
1526static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1527 struct net_device *dev,
1528 const struct in6_addr *saddr,
1529 const struct in6_addr *daddr,
1530 int proto, int len)
1531{
1532 struct ipv6hdr *hdr;
1533
1534 skb->protocol = htons(ETH_P_IPV6);
1535 skb->dev = dev;
1536
1537 skb_reset_network_header(skb);
1538 skb_put(skb, sizeof(struct ipv6hdr));
1539 hdr = ipv6_hdr(skb);
1540
1541 ip6_flow_hdr(hdr, 0, 0);
1542
1543 hdr->payload_len = htons(len);
1544 hdr->nexthdr = proto;
1545 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1546
1547 hdr->saddr = *saddr;
1548 hdr->daddr = *daddr;
1549}
1550
4c672e4b 1551static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1da177e4 1552{
8965779d 1553 struct net_device *dev = idev->dev;
c346dca1 1554 struct net *net = dev_net(dev);
b8ad0cbc 1555 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT
1556 struct sk_buff *skb;
1557 struct mld2_report *pmr;
1558 struct in6_addr addr_buf;
d7aabf22 1559 const struct in6_addr *saddr;
a7ae1992
HX
1560 int hlen = LL_RESERVED_SPACE(dev);
1561 int tlen = dev->needed_tailroom;
4c672e4b 1562 unsigned int size = mtu + hlen + tlen;
1da177e4
LT
1563 int err;
1564 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1565 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1566 IPV6_TLV_PADN, 0 };
1567
1568 /* we assume size > sizeof(ra) here */
72e09ad1
ED
1569 /* limit our allocations to order-0 page */
1570 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1571 skb = sock_alloc_send_skb(sk, size, 1, &err);
1da177e4 1572
cfcabdcc 1573 if (!skb)
1da177e4
LT
1574 return NULL;
1575
9d4a0314 1576 skb->priority = TC_PRIO_CONTROL;
4c672e4b
DB
1577 skb->reserved_tailroom = skb_end_offset(skb) -
1578 min(mtu, skb_end_offset(skb));
a7ae1992 1579 skb_reserve(skb, hlen);
1da177e4 1580
8965779d 1581 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1582 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1583 * use unspecified address as the source address
1da177e4
LT
1584 * when a valid link-local address is not available.
1585 */
d7aabf22
YH
1586 saddr = &in6addr_any;
1587 } else
1588 saddr = &addr_buf;
1da177e4 1589
2576f17d 1590 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4
LT
1591
1592 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1593
27a884dc 1594 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM
1595 skb_put(skb, sizeof(*pmr));
1596 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837
YH
1597 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1598 pmr->mld2r_resv1 = 0;
1599 pmr->mld2r_cksum = 0;
1600 pmr->mld2r_resv2 = 0;
1601 pmr->mld2r_ngrec = 0;
1da177e4
LT
1602 return skb;
1603}
1604
1605static void mld_sendpack(struct sk_buff *skb)
1606{
0660e03f 1607 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM
1608 struct mld2_report *pmr =
1609 (struct mld2_report *)skb_transport_header(skb);
1da177e4 1610 int payload_len, mldlen;
96b52e61 1611 struct inet6_dev *idev;
c346dca1 1612 struct net *net = dev_net(skb->dev);
1da177e4 1613 int err;
4c9483b2 1614 struct flowi6 fl6;
adf30907 1615 struct dst_entry *dst;
1da177e4 1616
96b52e61
ED
1617 rcu_read_lock();
1618 idev = __in6_dev_get(skb->dev);
edf391ff
NH
1619 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1620
29a3cad5
SH
1621 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1622 sizeof(*pip6);
1623 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1da177e4
LT
1624 pip6->payload_len = htons(payload_len);
1625
6e7cb837
YH
1626 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1627 IPPROTO_ICMPV6,
1628 csum_partial(skb_transport_header(skb),
1629 mldlen, 0));
41927178 1630
4c9483b2 1631 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
41927178
YH
1632 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1633 skb->dev->ifindex);
12fd84f4 1634 dst = icmp6_dst_alloc(skb->dev, &fl6);
41927178 1635
452edd59
DM
1636 err = 0;
1637 if (IS_ERR(dst)) {
1638 err = PTR_ERR(dst);
1639 dst = NULL;
1640 }
adf30907 1641 skb_dst_set(skb, dst);
41927178
YH
1642 if (err)
1643 goto err_out;
1644
edf391ff
NH
1645 payload_len = skb->len;
1646
7026b1dd 1647 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
29a26a56 1648 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
13206b6b 1649 dst_output);
41927178 1650out:
1da177e4 1651 if (!err) {
43a43b60
HFS
1652 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1653 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
43a43b60
HFS
1654 } else {
1655 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1656 }
1da177e4 1657
96b52e61 1658 rcu_read_unlock();
41927178
YH
1659 return;
1660
1661err_out:
1662 kfree_skb(skb);
1663 goto out;
1da177e4
LT
1664}
1665
1666static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1667{
fab10fe3 1668 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT
1669}
1670
1671static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1672 int type, struct mld2_grec **ppgr)
1673{
1674 struct net_device *dev = pmc->idev->dev;
1675 struct mld2_report *pmr;
1676 struct mld2_grec *pgr;
1677
1678 if (!skb)
8965779d 1679 skb = mld_newpack(pmc->idev, dev->mtu);
1da177e4
LT
1680 if (!skb)
1681 return NULL;
1682 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1683 pgr->grec_type = type;
1684 pgr->grec_auxwords = 0;
1685 pgr->grec_nsrcs = 0;
1686 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1687 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1688 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT
1689 *ppgr = pgr;
1690 return skb;
1691}
1692
4c672e4b 1693#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1da177e4
LT
1694
1695static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
6a7cc418 1696 int type, int gdeleted, int sdeleted, int crsend)
1da177e4 1697{
8965779d
AW
1698 struct inet6_dev *idev = pmc->idev;
1699 struct net_device *dev = idev->dev;
1da177e4
LT
1700 struct mld2_report *pmr;
1701 struct mld2_grec *pgr = NULL;
1702 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1703 int scount, stotal, first, isquery, truncate;
1da177e4
LT
1704
1705 if (pmc->mca_flags & MAF_NOREPORT)
1706 return skb;
1707
1708 isquery = type == MLD2_MODE_IS_INCLUDE ||
1709 type == MLD2_MODE_IS_EXCLUDE;
1710 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1711 type == MLD2_CHANGE_TO_EXCLUDE;
1712
5ab4a6c8
DS
1713 stotal = scount = 0;
1714
1da177e4
LT
1715 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1716
5ab4a6c8
DS
1717 if (!*psf_list)
1718 goto empty_source;
1719
9c70220b 1720 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT
1721
1722 /* EX and TO_EX get a fresh packet, if needed */
1723 if (truncate) {
6e7cb837 1724 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT
1725 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1726 if (skb)
1727 mld_sendpack(skb);
8965779d 1728 skb = mld_newpack(idev, dev->mtu);
1da177e4
LT
1729 }
1730 }
1731 first = 1;
1da177e4 1732 psf_prev = NULL;
67ba4152 1733 for (psf = *psf_list; psf; psf = psf_next) {
1da177e4
LT
1734 struct in6_addr *psrc;
1735
1736 psf_next = psf->sf_next;
1737
1738 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1739 psf_prev = psf;
1740 continue;
1741 }
1742
1743 /* clear marks on query responses */
1744 if (isquery)
1745 psf->sf_gsresp = 0;
1746
1747 if (AVAILABLE(skb) < sizeof(*psrc) +
1748 first*sizeof(struct mld2_grec)) {
1749 if (truncate && !first)
1750 break; /* truncate these */
1751 if (pgr)
1752 pgr->grec_nsrcs = htons(scount);
1753 if (skb)
1754 mld_sendpack(skb);
8965779d 1755 skb = mld_newpack(idev, dev->mtu);
1da177e4
LT
1756 first = 1;
1757 scount = 0;
1758 }
1759 if (first) {
1760 skb = add_grhead(skb, pmc, type, &pgr);
1761 first = 0;
1762 }
cc63f70b
AD
1763 if (!skb)
1764 return NULL;
1da177e4
LT
1765 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1766 *psrc = psf->sf_addr;
5ab4a6c8 1767 scount++; stotal++;
1da177e4
LT
1768 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1769 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1770 psf->sf_crcount--;
1771 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1772 if (psf_prev)
1773 psf_prev->sf_next = psf->sf_next;
1774 else
1775 *psf_list = psf->sf_next;
1776 kfree(psf);
1777 continue;
1778 }
1779 }
1780 psf_prev = psf;
1781 }
5ab4a6c8
DS
1782
1783empty_source:
1784 if (!stotal) {
1785 if (type == MLD2_ALLOW_NEW_SOURCES ||
1786 type == MLD2_BLOCK_OLD_SOURCES)
1787 return skb;
6a7cc418 1788 if (pmc->mca_crcount || isquery || crsend) {
5ab4a6c8
DS
1789 /* make sure we have room for group header */
1790 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1791 mld_sendpack(skb);
1792 skb = NULL; /* add_grhead will get a new one */
1793 }
1794 skb = add_grhead(skb, pmc, type, &pgr);
1795 }
1796 }
1da177e4
LT
1797 if (pgr)
1798 pgr->grec_nsrcs = htons(scount);
1799
1800 if (isquery)
1801 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1802 return skb;
1803}
1804
1805static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1806{
1807 struct sk_buff *skb = NULL;
1808 int type;
1809
8965779d 1810 read_lock_bh(&idev->lock);
1da177e4 1811 if (!pmc) {
67ba4152 1812 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT
1813 if (pmc->mca_flags & MAF_NOREPORT)
1814 continue;
1815 spin_lock_bh(&pmc->mca_lock);
1816 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1817 type = MLD2_MODE_IS_EXCLUDE;
1818 else
1819 type = MLD2_MODE_IS_INCLUDE;
6a7cc418 1820 skb = add_grec(skb, pmc, type, 0, 0, 0);
1da177e4
LT
1821 spin_unlock_bh(&pmc->mca_lock);
1822 }
1da177e4
LT
1823 } else {
1824 spin_lock_bh(&pmc->mca_lock);
1825 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1826 type = MLD2_MODE_IS_EXCLUDE;
1827 else
1828 type = MLD2_MODE_IS_INCLUDE;
6a7cc418 1829 skb = add_grec(skb, pmc, type, 0, 0, 0);
1da177e4
LT
1830 spin_unlock_bh(&pmc->mca_lock);
1831 }
8965779d 1832 read_unlock_bh(&idev->lock);
1da177e4
LT
1833 if (skb)
1834 mld_sendpack(skb);
1835}
1836
1837/*
1838 * remove zero-count source records from a source filter list
1839 */
1840static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1841{
1842 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1843
1844 psf_prev = NULL;
67ba4152 1845 for (psf = *ppsf; psf; psf = psf_next) {
1da177e4
LT
1846 psf_next = psf->sf_next;
1847 if (psf->sf_crcount == 0) {
1848 if (psf_prev)
1849 psf_prev->sf_next = psf->sf_next;
1850 else
1851 *ppsf = psf->sf_next;
1852 kfree(psf);
1853 } else
1854 psf_prev = psf;
1855 }
1856}
1857
1858static void mld_send_cr(struct inet6_dev *idev)
1859{
1860 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1861 struct sk_buff *skb = NULL;
1862 int type, dtype;
1863
1864 read_lock_bh(&idev->lock);
6457d26b 1865 spin_lock(&idev->mc_lock);
1da177e4
LT
1866
1867 /* deleted MCA's */
1868 pmc_prev = NULL;
67ba4152 1869 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1da177e4
LT
1870 pmc_next = pmc->next;
1871 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1872 type = MLD2_BLOCK_OLD_SOURCES;
1873 dtype = MLD2_BLOCK_OLD_SOURCES;
6a7cc418
FL
1874 skb = add_grec(skb, pmc, type, 1, 0, 0);
1875 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1da177e4
LT
1876 }
1877 if (pmc->mca_crcount) {
1da177e4
LT
1878 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1879 type = MLD2_CHANGE_TO_INCLUDE;
6a7cc418 1880 skb = add_grec(skb, pmc, type, 1, 0, 0);
1da177e4 1881 }
5ab4a6c8 1882 pmc->mca_crcount--;
1da177e4
LT
1883 if (pmc->mca_crcount == 0) {
1884 mld_clear_zeros(&pmc->mca_tomb);
1885 mld_clear_zeros(&pmc->mca_sources);
1886 }
1887 }
1888 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1889 !pmc->mca_sources) {
1890 if (pmc_prev)
1891 pmc_prev->next = pmc_next;
1892 else
1893 idev->mc_tomb = pmc_next;
1894 in6_dev_put(pmc->idev);
1895 kfree(pmc);
1896 } else
1897 pmc_prev = pmc;
1898 }
6457d26b 1899 spin_unlock(&idev->mc_lock);
1da177e4
LT
1900
1901 /* change recs */
67ba4152 1902 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT
1903 spin_lock_bh(&pmc->mca_lock);
1904 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1905 type = MLD2_BLOCK_OLD_SOURCES;
1906 dtype = MLD2_ALLOW_NEW_SOURCES;
1907 } else {
1908 type = MLD2_ALLOW_NEW_SOURCES;
1909 dtype = MLD2_BLOCK_OLD_SOURCES;
1910 }
6a7cc418
FL
1911 skb = add_grec(skb, pmc, type, 0, 0, 0);
1912 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1da177e4
LT
1913
1914 /* filter mode changes */
1915 if (pmc->mca_crcount) {
1da177e4
LT
1916 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1917 type = MLD2_CHANGE_TO_EXCLUDE;
1918 else
1919 type = MLD2_CHANGE_TO_INCLUDE;
6a7cc418 1920 skb = add_grec(skb, pmc, type, 0, 0, 0);
5ab4a6c8 1921 pmc->mca_crcount--;
1da177e4
LT
1922 }
1923 spin_unlock_bh(&pmc->mca_lock);
1924 }
1925 read_unlock_bh(&idev->lock);
1926 if (!skb)
1927 return;
1928 (void) mld_sendpack(skb);
1929}
1930
1931static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1932{
c346dca1 1933 struct net *net = dev_net(dev);
b8ad0cbc 1934 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1935 struct inet6_dev *idev;
1ab1457c 1936 struct sk_buff *skb;
6e7cb837 1937 struct mld_msg *hdr;
d7aabf22 1938 const struct in6_addr *snd_addr, *saddr;
1da177e4 1939 struct in6_addr addr_buf;
a7ae1992
HX
1940 int hlen = LL_RESERVED_SPACE(dev);
1941 int tlen = dev->needed_tailroom;
1da177e4
LT
1942 int err, len, payload_len, full_len;
1943 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1944 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1945 IPV6_TLV_PADN, 0 };
4c9483b2 1946 struct flowi6 fl6;
adf30907 1947 struct dst_entry *dst;
1da177e4 1948
f3ee4010
YH
1949 if (type == ICMPV6_MGM_REDUCTION)
1950 snd_addr = &in6addr_linklocal_allrouters;
1951 else
1952 snd_addr = addr;
1da177e4
LT
1953
1954 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1955 payload_len = len + sizeof(ra);
1956 full_len = sizeof(struct ipv6hdr) + payload_len;
1957
edf391ff
NH
1958 rcu_read_lock();
1959 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1960 IPSTATS_MIB_OUT, full_len);
1961 rcu_read_unlock();
1962
a7ae1992 1963 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1da177e4 1964
63159f29 1965 if (!skb) {
a11d206d 1966 rcu_read_lock();
3bd653c8 1967 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH
1968 IPSTATS_MIB_OUTDISCARDS);
1969 rcu_read_unlock();
1da177e4
LT
1970 return;
1971 }
9d4a0314 1972 skb->priority = TC_PRIO_CONTROL;
a7ae1992 1973 skb_reserve(skb, hlen);
1da177e4 1974
95c385b4 1975 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1976 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1977 * use unspecified address as the source address
1da177e4
LT
1978 * when a valid link-local address is not available.
1979 */
d7aabf22
YH
1980 saddr = &in6addr_any;
1981 } else
1982 saddr = &addr_buf;
1da177e4 1983
2576f17d 1984 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT
1985
1986 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1987
6e7cb837
YH
1988 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1989 memset(hdr, 0, sizeof(struct mld_msg));
1990 hdr->mld_type = type;
4e3fd7a0 1991 hdr->mld_mca = *addr;
1da177e4 1992
6e7cb837
YH
1993 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1994 IPPROTO_ICMPV6,
1995 csum_partial(hdr, len, 0));
1da177e4 1996
96b52e61
ED
1997 rcu_read_lock();
1998 idev = __in6_dev_get(skb->dev);
1da177e4 1999
4c9483b2 2000 icmpv6_flow_init(sk, &fl6, type,
41927178
YH
2001 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2002 skb->dev->ifindex);
12fd84f4 2003 dst = icmp6_dst_alloc(skb->dev, &fl6);
452edd59
DM
2004 if (IS_ERR(dst)) {
2005 err = PTR_ERR(dst);
41927178 2006 goto err_out;
452edd59 2007 }
41927178 2008
adf30907 2009 skb_dst_set(skb, dst);
29a26a56
EB
2010 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2011 net, sk, skb, NULL, skb->dev,
13206b6b 2012 dst_output);
41927178 2013out:
1da177e4 2014 if (!err) {
5c5d244b 2015 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 2016 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4 2017 } else
3bd653c8 2018 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 2019
96b52e61 2020 rcu_read_unlock();
1da177e4 2021 return;
41927178
YH
2022
2023err_out:
2024 kfree_skb(skb);
2025 goto out;
1da177e4
LT
2026}
2027
6a7cc418 2028static void mld_send_initial_cr(struct inet6_dev *idev)
b173ee48 2029{
6a7cc418
FL
2030 struct sk_buff *skb;
2031 struct ifmcaddr6 *pmc;
2032 int type;
2033
2034 if (mld_in_v1_mode(idev))
2035 return;
2036
2037 skb = NULL;
2038 read_lock_bh(&idev->lock);
67ba4152 2039 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
6a7cc418
FL
2040 spin_lock_bh(&pmc->mca_lock);
2041 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2042 type = MLD2_CHANGE_TO_EXCLUDE;
2043 else
2044 type = MLD2_CHANGE_TO_INCLUDE;
2045 skb = add_grec(skb, pmc, type, 0, 0, 1);
2046 spin_unlock_bh(&pmc->mca_lock);
b173ee48 2047 }
6a7cc418
FL
2048 read_unlock_bh(&idev->lock);
2049 if (skb)
2050 mld_sendpack(skb);
b173ee48
HFS
2051}
2052
2053void ipv6_mc_dad_complete(struct inet6_dev *idev)
2054{
2055 idev->mc_dad_count = idev->mc_qrv;
2056 if (idev->mc_dad_count) {
6a7cc418 2057 mld_send_initial_cr(idev);
b173ee48
HFS
2058 idev->mc_dad_count--;
2059 if (idev->mc_dad_count)
2060 mld_dad_start_timer(idev, idev->mc_maxdelay);
2061 }
2062}
2063
2064static void mld_dad_timer_expire(unsigned long data)
2065{
2066 struct inet6_dev *idev = (struct inet6_dev *)data;
2067
6a7cc418 2068 mld_send_initial_cr(idev);
b173ee48
HFS
2069 if (idev->mc_dad_count) {
2070 idev->mc_dad_count--;
2071 if (idev->mc_dad_count)
2072 mld_dad_start_timer(idev, idev->mc_maxdelay);
2073 }
9260d3e1 2074 in6_dev_put(idev);
b173ee48
HFS
2075}
2076
1da177e4 2077static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
b71d1d42 2078 const struct in6_addr *psfsrc)
1da177e4
LT
2079{
2080 struct ip6_sf_list *psf, *psf_prev;
2081 int rv = 0;
2082
2083 psf_prev = NULL;
67ba4152 2084 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT
2085 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2086 break;
2087 psf_prev = psf;
2088 }
2089 if (!psf || psf->sf_count[sfmode] == 0) {
2090 /* source filter not found, or count wrong => bug */
2091 return -ESRCH;
2092 }
2093 psf->sf_count[sfmode]--;
2094 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2095 struct inet6_dev *idev = pmc->idev;
2096
2097 /* no more filters for this source */
2098 if (psf_prev)
2099 psf_prev->sf_next = psf->sf_next;
2100 else
2101 pmc->mca_sources = psf->sf_next;
2102 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
6c567b78 2103 !mld_in_v1_mode(idev)) {
1da177e4
LT
2104 psf->sf_crcount = idev->mc_qrv;
2105 psf->sf_next = pmc->mca_tomb;
2106 pmc->mca_tomb = psf;
2107 rv = 1;
2108 } else
2109 kfree(psf);
2110 }
2111 return rv;
2112}
2113
b71d1d42
ED
2114static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2115 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT
2116 int delta)
2117{
2118 struct ifmcaddr6 *pmc;
2119 int changerec = 0;
2120 int i, err;
2121
2122 if (!idev)
2123 return -ENODEV;
2124 read_lock_bh(&idev->lock);
67ba4152 2125 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT
2126 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2127 break;
2128 }
2129 if (!pmc) {
2130 /* MCA not found?? bug */
2131 read_unlock_bh(&idev->lock);
2132 return -ESRCH;
2133 }
2134 spin_lock_bh(&pmc->mca_lock);
2135 sf_markstate(pmc);
2136 if (!delta) {
2137 if (!pmc->mca_sfcount[sfmode]) {
2138 spin_unlock_bh(&pmc->mca_lock);
2139 read_unlock_bh(&idev->lock);
2140 return -EINVAL;
2141 }
2142 pmc->mca_sfcount[sfmode]--;
2143 }
2144 err = 0;
67ba4152 2145 for (i = 0; i < sfcount; i++) {
1da177e4
LT
2146 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2147
2148 changerec |= rv > 0;
2149 if (!err && rv < 0)
2150 err = rv;
2151 }
2152 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2153 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2154 pmc->mca_sfcount[MCAST_INCLUDE]) {
2155 struct ip6_sf_list *psf;
2156
2157 /* filter mode change */
2158 pmc->mca_sfmode = MCAST_INCLUDE;
2159 pmc->mca_crcount = idev->mc_qrv;
2160 idev->mc_ifc_count = pmc->mca_crcount;
67ba4152 2161 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
1da177e4
LT
2162 psf->sf_crcount = 0;
2163 mld_ifc_event(pmc->idev);
2164 } else if (sf_setstate(pmc) || changerec)
2165 mld_ifc_event(pmc->idev);
2166 spin_unlock_bh(&pmc->mca_lock);
2167 read_unlock_bh(&idev->lock);
2168 return err;
2169}
2170
2171/*
2172 * Add multicast single-source filter to the interface list
2173 */
2174static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
99d2f47a 2175 const struct in6_addr *psfsrc)
1da177e4
LT
2176{
2177 struct ip6_sf_list *psf, *psf_prev;
2178
2179 psf_prev = NULL;
67ba4152 2180 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT
2181 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2182 break;
2183 psf_prev = psf;
2184 }
2185 if (!psf) {
0c600eda 2186 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT
2187 if (!psf)
2188 return -ENOBUFS;
0c600eda 2189
1da177e4
LT
2190 psf->sf_addr = *psfsrc;
2191 if (psf_prev) {
2192 psf_prev->sf_next = psf;
2193 } else
2194 pmc->mca_sources = psf;
2195 }
2196 psf->sf_count[sfmode]++;
2197 return 0;
2198}
2199
2200static void sf_markstate(struct ifmcaddr6 *pmc)
2201{
2202 struct ip6_sf_list *psf;
2203 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2204
67ba4152 2205 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
1da177e4
LT
2206 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2207 psf->sf_oldin = mca_xcount ==
2208 psf->sf_count[MCAST_EXCLUDE] &&
2209 !psf->sf_count[MCAST_INCLUDE];
2210 } else
2211 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2212}
2213
2214static int sf_setstate(struct ifmcaddr6 *pmc)
2215{
7add2a43 2216 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT
2217 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2218 int qrv = pmc->idev->mc_qrv;
2219 int new_in, rv;
2220
2221 rv = 0;
67ba4152 2222 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT
2223 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2224 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2225 !psf->sf_count[MCAST_INCLUDE];
2226 } else
2227 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS
2228 if (new_in) {
2229 if (!psf->sf_oldin) {
e80e28b6 2230 struct ip6_sf_list *prev = NULL;
7add2a43 2231
67ba4152
IM
2232 for (dpsf = pmc->mca_tomb; dpsf;
2233 dpsf = dpsf->sf_next) {
7add2a43
DS
2234 if (ipv6_addr_equal(&dpsf->sf_addr,
2235 &psf->sf_addr))
2236 break;
2237 prev = dpsf;
2238 }
2239 if (dpsf) {
2240 if (prev)
2241 prev->sf_next = dpsf->sf_next;
2242 else
2243 pmc->mca_tomb = dpsf->sf_next;
2244 kfree(dpsf);
2245 }
2246 psf->sf_crcount = qrv;
2247 rv++;
2248 }
2249 } else if (psf->sf_oldin) {
2250 psf->sf_crcount = 0;
2251 /*
2252 * add or update "delete" records if an active filter
2253 * is now inactive
2254 */
67ba4152 2255 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
7add2a43
DS
2256 if (ipv6_addr_equal(&dpsf->sf_addr,
2257 &psf->sf_addr))
2258 break;
2259 if (!dpsf) {
5d55354f 2260 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
7add2a43
DS
2261 if (!dpsf)
2262 continue;
2263 *dpsf = *psf;
2264 /* pmc->mca_lock held by callers */
2265 dpsf->sf_next = pmc->mca_tomb;
2266 pmc->mca_tomb = dpsf;
2267 }
2268 dpsf->sf_crcount = qrv;
1da177e4
LT
2269 rv++;
2270 }
2271 }
2272 return rv;
2273}
2274
2275/*
2276 * Add multicast source filter list to the interface list
2277 */
b71d1d42
ED
2278static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2279 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT
2280 int delta)
2281{
2282 struct ifmcaddr6 *pmc;
2283 int isexclude;
2284 int i, err;
2285
2286 if (!idev)
2287 return -ENODEV;
2288 read_lock_bh(&idev->lock);
67ba4152 2289 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT
2290 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2291 break;
2292 }
2293 if (!pmc) {
2294 /* MCA not found?? bug */
2295 read_unlock_bh(&idev->lock);
2296 return -ESRCH;
2297 }
2298 spin_lock_bh(&pmc->mca_lock);
2299
2300 sf_markstate(pmc);
2301 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2302 if (!delta)
2303 pmc->mca_sfcount[sfmode]++;
2304 err = 0;
67ba4152 2305 for (i = 0; i < sfcount; i++) {
99d2f47a 2306 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT
2307 if (err)
2308 break;
2309 }
2310 if (err) {
2311 int j;
2312
2313 if (!delta)
2314 pmc->mca_sfcount[sfmode]--;
67ba4152 2315 for (j = 0; j < i; j++)
78d50217 2316 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4 2317 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT
2318 struct ip6_sf_list *psf;
2319
2320 /* filter mode change */
2321 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2322 pmc->mca_sfmode = MCAST_EXCLUDE;
2323 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2324 pmc->mca_sfmode = MCAST_INCLUDE;
2325 /* else no filters; keep old mode for reports */
2326
2327 pmc->mca_crcount = idev->mc_qrv;
2328 idev->mc_ifc_count = pmc->mca_crcount;
67ba4152 2329 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
1da177e4
LT
2330 psf->sf_crcount = 0;
2331 mld_ifc_event(idev);
2332 } else if (sf_setstate(pmc))
2333 mld_ifc_event(idev);
2334 spin_unlock_bh(&pmc->mca_lock);
2335 read_unlock_bh(&idev->lock);
2336 return err;
2337}
2338
2339static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2340{
2341 struct ip6_sf_list *psf, *nextpsf;
2342
67ba4152 2343 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
1da177e4
LT
2344 nextpsf = psf->sf_next;
2345 kfree(psf);
2346 }
2347 pmc->mca_tomb = NULL;
67ba4152 2348 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
1da177e4
LT
2349 nextpsf = psf->sf_next;
2350 kfree(psf);
2351 }
2352 pmc->mca_sources = NULL;
2353 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2354 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT
2355 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2356}
2357
2358
2359static void igmp6_join_group(struct ifmcaddr6 *ma)
2360{
2361 unsigned long delay;
2362
2363 if (ma->mca_flags & MAF_NOREPORT)
2364 return;
2365
2366 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2367
63862b5b 2368 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
1da177e4
LT
2369
2370 spin_lock_bh(&ma->mca_lock);
2371 if (del_timer(&ma->mca_timer)) {
2372 atomic_dec(&ma->mca_refcnt);
2373 delay = ma->mca_timer.expires - jiffies;
2374 }
2375
2376 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2377 atomic_inc(&ma->mca_refcnt);
2378 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2379 spin_unlock_bh(&ma->mca_lock);
2380}
2381
2382static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2383 struct inet6_dev *idev)
2384{
2385 int err;
2386
f7ed925c 2387 /* callers have the socket lock and rtnl lock
5ab4a6c8
DS
2388 * so no other readers or writers of iml or its sflist
2389 */
cfcabdcc 2390 if (!iml->sflist) {
1da177e4
LT
2391 /* any-source empty exclude case */
2392 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2393 }
2394 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2395 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2396 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2397 iml->sflist = NULL;
2398 return err;
2399}
2400
2401static void igmp6_leave_group(struct ifmcaddr6 *ma)
2402{
6c567b78 2403 if (mld_in_v1_mode(ma->idev)) {
1da177e4
LT
2404 if (ma->mca_flags & MAF_LAST_REPORTER)
2405 igmp6_send(&ma->mca_addr, ma->idev->dev,
2406 ICMPV6_MGM_REDUCTION);
2407 } else {
2408 mld_add_delrec(ma->idev, ma);
2409 mld_ifc_event(ma->idev);
2410 }
2411}
2412
2413static void mld_gq_timer_expire(unsigned long data)
2414{
2415 struct inet6_dev *idev = (struct inet6_dev *)data;
2416
2417 idev->mc_gq_running = 0;
2418 mld_send_report(idev, NULL);
9260d3e1 2419 in6_dev_put(idev);
1da177e4
LT
2420}
2421
2422static void mld_ifc_timer_expire(unsigned long data)
2423{
2424 struct inet6_dev *idev = (struct inet6_dev *)data;
2425
2426 mld_send_cr(idev);
2427 if (idev->mc_ifc_count) {
2428 idev->mc_ifc_count--;
2429 if (idev->mc_ifc_count)
2430 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2431 }
9260d3e1 2432 in6_dev_put(idev);
1da177e4
LT
2433}
2434
2435static void mld_ifc_event(struct inet6_dev *idev)
2436{
6c567b78 2437 if (mld_in_v1_mode(idev))
1da177e4
LT
2438 return;
2439 idev->mc_ifc_count = idev->mc_qrv;
2440 mld_ifc_start_timer(idev, 1);
2441}
2442
2443
2444static void igmp6_timer_handler(unsigned long data)
2445{
2446 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2447
6c567b78 2448 if (mld_in_v1_mode(ma->idev))
1da177e4
LT
2449 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2450 else
2451 mld_send_report(ma->idev, ma);
2452
2453 spin_lock(&ma->mca_lock);
2454 ma->mca_flags |= MAF_LAST_REPORTER;
2455 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2456 spin_unlock(&ma->mca_lock);
2457 ma_put(ma);
2458}
2459
75c78500
MS
2460/* Device changing type */
2461
2462void ipv6_mc_unmap(struct inet6_dev *idev)
2463{
2464 struct ifmcaddr6 *i;
2465
2466 /* Install multicast list, except for all-nodes (already installed) */
2467
2468 read_lock_bh(&idev->lock);
2469 for (i = idev->mc_list; i; i = i->next)
2470 igmp6_group_dropped(i);
2471 read_unlock_bh(&idev->lock);
2472}
2473
2474void ipv6_mc_remap(struct inet6_dev *idev)
2475{
2476 ipv6_mc_up(idev);
2477}
2478
1da177e4
LT
2479/* Device going down */
2480
2481void ipv6_mc_down(struct inet6_dev *idev)
2482{
2483 struct ifmcaddr6 *i;
2484
2485 /* Withdraw multicast list */
2486
2487 read_lock_bh(&idev->lock);
b4af8def
DB
2488 mld_ifc_stop_timer(idev);
2489 mld_gq_stop_timer(idev);
2490 mld_dad_stop_timer(idev);
1da177e4 2491
67ba4152 2492 for (i = idev->mc_list; i; i = i->next)
1da177e4
LT
2493 igmp6_group_dropped(i);
2494 read_unlock_bh(&idev->lock);
2495
2496 mld_clear_delrec(idev);
2497}
2498
2f711939
HFS
2499static void ipv6_mc_reset(struct inet6_dev *idev)
2500{
2501 idev->mc_qrv = sysctl_mld_qrv;
2502 idev->mc_qi = MLD_QI_DEFAULT;
2503 idev->mc_qri = MLD_QRI_DEFAULT;
2504 idev->mc_v1_seen = 0;
2505 idev->mc_maxdelay = unsolicited_report_interval(idev);
2506}
1da177e4
LT
2507
2508/* Device going up */
2509
2510void ipv6_mc_up(struct inet6_dev *idev)
2511{
2512 struct ifmcaddr6 *i;
2513
2514 /* Install multicast list, except for all-nodes (already installed) */
2515
2516 read_lock_bh(&idev->lock);
2f711939 2517 ipv6_mc_reset(idev);
67ba4152 2518 for (i = idev->mc_list; i; i = i->next)
1da177e4
LT
2519 igmp6_group_added(i);
2520 read_unlock_bh(&idev->lock);
2521}
2522
2523/* IPv6 device initialization. */
2524
2525void ipv6_mc_init_dev(struct inet6_dev *idev)
2526{
1da177e4 2527 write_lock_bh(&idev->lock);
6457d26b 2528 spin_lock_init(&idev->mc_lock);
1da177e4 2529 idev->mc_gq_running = 0;
b24b8a24
PE
2530 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2531 (unsigned long)idev);
1da177e4
LT
2532 idev->mc_tomb = NULL;
2533 idev->mc_ifc_count = 0;
b24b8a24
PE
2534 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2535 (unsigned long)idev);
b173ee48
HFS
2536 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2537 (unsigned long)idev);
2f711939 2538 ipv6_mc_reset(idev);
1da177e4 2539 write_unlock_bh(&idev->lock);
1da177e4
LT
2540}
2541
2542/*
2543 * Device is about to be destroyed: clean up.
2544 */
2545
2546void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2547{
2548 struct ifmcaddr6 *i;
1da177e4
LT
2549
2550 /* Deactivate timers */
2551 ipv6_mc_down(idev);
2552
2553 /* Delete all-nodes address. */
1da177e4
LT
2554 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2555 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2556 * fail.
2557 */
f3ee4010 2558 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2559
f3ee4010
YH
2560 if (idev->cnf.forwarding)
2561 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT
2562
2563 write_lock_bh(&idev->lock);
2564 while ((i = idev->mc_list) != NULL) {
2565 idev->mc_list = i->next;
2566 write_unlock_bh(&idev->lock);
2567
2568 igmp6_group_dropped(i);
2569 ma_put(i);
2570
2571 write_lock_bh(&idev->lock);
2572 }
2573 write_unlock_bh(&idev->lock);
2574}
2575
2576#ifdef CONFIG_PROC_FS
2577struct igmp6_mc_iter_state {
b8ad0cbc 2578 struct seq_net_private p;
1da177e4
LT
2579 struct net_device *dev;
2580 struct inet6_dev *idev;
2581};
2582
2583#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2584
2585static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2586{
2587 struct ifmcaddr6 *im = NULL;
2588 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2589 struct net *net = seq_file_net(seq);
1da177e4 2590
7562f876 2591 state->idev = NULL;
ce81b76a 2592 for_each_netdev_rcu(net, state->dev) {
1da177e4 2593 struct inet6_dev *idev;
ce81b76a 2594 idev = __in6_dev_get(state->dev);
1da177e4
LT
2595 if (!idev)
2596 continue;
2597 read_lock_bh(&idev->lock);
2598 im = idev->mc_list;
2599 if (im) {
2600 state->idev = idev;
2601 break;
2602 }
2603 read_unlock_bh(&idev->lock);
1da177e4
LT
2604 }
2605 return im;
2606}
2607
2608static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2609{
2610 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2611
2612 im = im->next;
2613 while (!im) {
53b24b8f 2614 if (likely(state->idev))
1da177e4 2615 read_unlock_bh(&state->idev->lock);
ce81b76a
ED
2616
2617 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT
2618 if (!state->dev) {
2619 state->idev = NULL;
2620 break;
2621 }
ce81b76a 2622 state->idev = __in6_dev_get(state->dev);
1da177e4
LT
2623 if (!state->idev)
2624 continue;
2625 read_lock_bh(&state->idev->lock);
2626 im = state->idev->mc_list;
2627 }
2628 return im;
2629}
2630
2631static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2632{
2633 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2634 if (im)
2635 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2636 --pos;
2637 return pos ? NULL : im;
2638}
2639
2640static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2641 __acquires(RCU)
1da177e4 2642{
ce81b76a 2643 rcu_read_lock();
1da177e4
LT
2644 return igmp6_mc_get_idx(seq, *pos);
2645}
2646
2647static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2648{
ce81b76a
ED
2649 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2650
1da177e4
LT
2651 ++*pos;
2652 return im;
2653}
2654
2655static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2656 __releases(RCU)
1da177e4
LT
2657{
2658 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2659
53b24b8f 2660 if (likely(state->idev)) {
1da177e4 2661 read_unlock_bh(&state->idev->lock);
1da177e4
LT
2662 state->idev = NULL;
2663 }
2664 state->dev = NULL;
ce81b76a 2665 rcu_read_unlock();
1da177e4
LT
2666}
2667
2668static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2669{
2670 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2671 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2672
2673 seq_printf(seq,
4b7a4274 2674 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2675 state->dev->ifindex, state->dev->name,
b071195d 2676 &im->mca_addr,
1da177e4
LT
2677 im->mca_users, im->mca_flags,
2678 (im->mca_flags&MAF_TIMER_RUNNING) ?
2679 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2680 return 0;
2681}
2682
56b3d975 2683static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT
2684 .start = igmp6_mc_seq_start,
2685 .next = igmp6_mc_seq_next,
2686 .stop = igmp6_mc_seq_stop,
2687 .show = igmp6_mc_seq_show,
2688};
2689
2690static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2691{
b8ad0cbc
DL
2692 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2693 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT
2694}
2695
9a32144e 2696static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT
2697 .owner = THIS_MODULE,
2698 .open = igmp6_mc_seq_open,
2699 .read = seq_read,
2700 .llseek = seq_lseek,
b8ad0cbc 2701 .release = seq_release_net,
1da177e4
LT
2702};
2703
2704struct igmp6_mcf_iter_state {
b8ad0cbc 2705 struct seq_net_private p;
1da177e4
LT
2706 struct net_device *dev;
2707 struct inet6_dev *idev;
2708 struct ifmcaddr6 *im;
2709};
2710
2711#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2712
2713static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2714{
2715 struct ip6_sf_list *psf = NULL;
2716 struct ifmcaddr6 *im = NULL;
2717 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2718 struct net *net = seq_file_net(seq);
1da177e4 2719
7562f876
PE
2720 state->idev = NULL;
2721 state->im = NULL;
ce81b76a 2722 for_each_netdev_rcu(net, state->dev) {
1da177e4 2723 struct inet6_dev *idev;
ce81b76a 2724 idev = __in6_dev_get(state->dev);
1da177e4
LT
2725 if (unlikely(idev == NULL))
2726 continue;
2727 read_lock_bh(&idev->lock);
2728 im = idev->mc_list;
53b24b8f 2729 if (likely(im)) {
1da177e4
LT
2730 spin_lock_bh(&im->mca_lock);
2731 psf = im->mca_sources;
53b24b8f 2732 if (likely(psf)) {
1da177e4
LT
2733 state->im = im;
2734 state->idev = idev;
2735 break;
2736 }
2737 spin_unlock_bh(&im->mca_lock);
2738 }
2739 read_unlock_bh(&idev->lock);
1da177e4
LT
2740 }
2741 return psf;
2742}
2743
2744static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2745{
2746 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2747
2748 psf = psf->sf_next;
2749 while (!psf) {
2750 spin_unlock_bh(&state->im->mca_lock);
2751 state->im = state->im->next;
2752 while (!state->im) {
53b24b8f 2753 if (likely(state->idev))
1da177e4 2754 read_unlock_bh(&state->idev->lock);
ce81b76a
ED
2755
2756 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT
2757 if (!state->dev) {
2758 state->idev = NULL;
2759 goto out;
2760 }
ce81b76a 2761 state->idev = __in6_dev_get(state->dev);
1da177e4
LT
2762 if (!state->idev)
2763 continue;
2764 read_lock_bh(&state->idev->lock);
2765 state->im = state->idev->mc_list;
2766 }
2767 if (!state->im)
2768 break;
2769 spin_lock_bh(&state->im->mca_lock);
2770 psf = state->im->mca_sources;
2771 }
2772out:
2773 return psf;
2774}
2775
2776static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2777{
2778 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2779 if (psf)
2780 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2781 --pos;
2782 return pos ? NULL : psf;
2783}
2784
2785static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2786 __acquires(RCU)
1da177e4 2787{
ce81b76a 2788 rcu_read_lock();
1da177e4
LT
2789 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2790}
2791
2792static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2793{
2794 struct ip6_sf_list *psf;
2795 if (v == SEQ_START_TOKEN)
2796 psf = igmp6_mcf_get_first(seq);
2797 else
2798 psf = igmp6_mcf_get_next(seq, v);
2799 ++*pos;
2800 return psf;
2801}
2802
2803static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2804 __releases(RCU)
1da177e4
LT
2805{
2806 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
53b24b8f 2807 if (likely(state->im)) {
1da177e4
LT
2808 spin_unlock_bh(&state->im->mca_lock);
2809 state->im = NULL;
2810 }
53b24b8f 2811 if (likely(state->idev)) {
1da177e4 2812 read_unlock_bh(&state->idev->lock);
1da177e4
LT
2813 state->idev = NULL;
2814 }
2815 state->dev = NULL;
ce81b76a 2816 rcu_read_unlock();
1da177e4
LT
2817}
2818
2819static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2820{
2821 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2822 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2823
2824 if (v == SEQ_START_TOKEN) {
1744bea1 2825 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
1da177e4
LT
2826 } else {
2827 seq_printf(seq,
4b7a4274 2828 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2829 state->dev->ifindex, state->dev->name,
b071195d
HH
2830 &state->im->mca_addr,
2831 &psf->sf_addr,
1da177e4
LT
2832 psf->sf_count[MCAST_INCLUDE],
2833 psf->sf_count[MCAST_EXCLUDE]);
2834 }
2835 return 0;
2836}
2837
56b3d975 2838static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT
2839 .start = igmp6_mcf_seq_start,
2840 .next = igmp6_mcf_seq_next,
2841 .stop = igmp6_mcf_seq_stop,
2842 .show = igmp6_mcf_seq_show,
2843};
2844
2845static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2846{
b8ad0cbc
DL
2847 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2848 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT
2849}
2850
9a32144e 2851static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT
2852 .owner = THIS_MODULE,
2853 .open = igmp6_mcf_seq_open,
2854 .read = seq_read,
2855 .llseek = seq_lseek,
b8ad0cbc 2856 .release = seq_release_net,
1da177e4 2857};
ea82edf7 2858
2c8c1e72 2859static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL
2860{
2861 int err;
2862
2863 err = -ENOMEM;
d4beaa66 2864 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
ea82edf7 2865 goto out;
d4beaa66
G
2866 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2867 &igmp6_mcf_seq_fops))
ea82edf7
DL
2868 goto out_proc_net_igmp6;
2869
2870 err = 0;
2871out:
2872 return err;
2873
2874out_proc_net_igmp6:
ece31ffd 2875 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL
2876 goto out;
2877}
2878
2c8c1e72 2879static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7 2880{
ece31ffd
G
2881 remove_proc_entry("mcfilter6", net->proc_net);
2882 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL
2883}
2884#else
2c8c1e72 2885static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL
2886{
2887 return 0;
2888}
2c8c1e72 2889static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2890{
ea82edf7 2891}
1da177e4
LT
2892#endif
2893
2c8c1e72 2894static int __net_init igmp6_net_init(struct net *net)
1da177e4 2895{
1da177e4
LT
2896 int err;
2897
1ed8516f
DL
2898 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2899 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4 2900 if (err < 0) {
f3213831 2901 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
1da177e4 2902 err);
b8ad0cbc 2903 goto out;
1da177e4
LT
2904 }
2905
1ed8516f 2906 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2907
93a714d6
MC
2908 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2909 SOCK_RAW, IPPROTO_ICMPV6, net);
2910 if (err < 0) {
2911 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2912 err);
2913 goto out_sock_create;
2914 }
2915
ea82edf7
DL
2916 err = igmp6_proc_init(net);
2917 if (err)
93a714d6
MC
2918 goto out_sock_create_autojoin;
2919
2920 return 0;
b8ad0cbc 2921
93a714d6
MC
2922out_sock_create_autojoin:
2923 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
b8ad0cbc 2924out_sock_create:
1ed8516f 2925 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
93a714d6
MC
2926out:
2927 return err;
1da177e4
LT
2928}
2929
2c8c1e72 2930static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2931{
1ed8516f 2932 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
93a714d6 2933 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
ea82edf7 2934 igmp6_proc_exit(net);
1da177e4 2935}
b8ad0cbc
DL
2936
2937static struct pernet_operations igmp6_net_ops = {
2938 .init = igmp6_net_init,
2939 .exit = igmp6_net_exit,
2940};
2941
2942int __init igmp6_init(void)
2943{
2944 return register_pernet_subsys(&igmp6_net_ops);
2945}
2946
2947void igmp6_cleanup(void)
2948{
2949 unregister_pernet_subsys(&igmp6_net_ops);
2950}
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