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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 151
[linux-block.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 67/* Ensure that we have struct in6_addr aligned on 32bit word. */
32b395a1
MY		 68static int __mld2_query_bugs[] __attribute__((__unused__)) = {
69 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
70 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
71 BUILD_BUG_ON_ZERO(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);
e99e88a9 78static void igmp6_timer_handler(struct timer_list *t);
1da177e4 79
e99e88a9
KC		 80static void mld_gq_timer_expire(struct timer_list *t);
81static void mld_ifc_timer_expire(struct timer_list *t);
1da177e4
LT		 82static void mld_ifc_event(struct inet6_dev *idev);
83static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
1666d49e 84static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
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);
c7ea20c9
HL		 98static int __ipv6_dev_mc_inc(struct net_device *dev,
99 const struct in6_addr *addr, unsigned int mode);
1da177e4 100
1da177e4 101#define MLD_QRV_DEFAULT 2
89225d1c
DB		 102/* RFC3810, 9.2. Query Interval */
103#define MLD_QI_DEFAULT (125 * HZ)
104/* RFC3810, 9.3. Query Response Interval */
105#define MLD_QRI_DEFAULT (10 * HZ)
1da177e4 106
9fd07841
DB		 107/* RFC3810, 8.1 Query Version Distinctions */
108#define MLD_V1_QUERY_LEN 24
109#define MLD_V2_QUERY_LEN_MIN 28
110
6f4353d8 111#define IPV6_MLD_MAX_MSF 64
1da177e4 112
ab32ea5d 113int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
2f711939 114int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
1da177e4
LT		 115
116/*
117 * socket join on multicast group
118 */
119
456b61bc
ED		 120#define for_each_pmc_rcu(np, pmc) \
121 for (pmc = rcu_dereference(np->ipv6_mc_list); \
122 pmc != NULL; \
123 pmc = rcu_dereference(pmc->next))
124
fc4eba58
HFS		 125static int unsolicited_report_interval(struct inet6_dev *idev)
126{
127 int iv;
128
6c567b78 129 if (mld_in_v1_mode(idev))
fc4eba58
HFS		 130 iv = idev->cnf.mldv1_unsolicited_report_interval;
131 else
132 iv = idev->cnf.mldv2_unsolicited_report_interval;
133
134 return iv > 0 ? iv : 1;
135}
136
c7ea20c9
HL		 137static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
138 const struct in6_addr *addr, unsigned int mode)
1da177e4
LT		 139{
140 struct net_device *dev = NULL;
141 struct ipv6_mc_socklist *mc_lst;
142 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 143 struct net *net = sock_net(sk);
1da177e4
LT		 144 int err;
145
46a4dee0
MC		 146 ASSERT_RTNL();
147
1da177e4
LT		 148 if (!ipv6_addr_is_multicast(addr))
149 return -EINVAL;
150
456b61bc
ED		 151 rcu_read_lock();
152 for_each_pmc_rcu(np, mc_lst) {
c9e3e8b6
DS		 153 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
154 ipv6_addr_equal(&mc_lst->addr, addr)) {
456b61bc 155 rcu_read_unlock();
c9e3e8b6
DS		 156 return -EADDRINUSE;
157 }
158 }
456b61bc 159 rcu_read_unlock();
c9e3e8b6 160
1da177e4
LT		 161 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
162
63159f29 163 if (!mc_lst)
1da177e4
LT		 164 return -ENOMEM;
165
166 mc_lst->next = NULL;
4e3fd7a0 167 mc_lst->addr = *addr;
1da177e4
LT		 168
169 if (ifindex == 0) {
170 struct rt6_info *rt;
b75cc8f9 171 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
1da177e4 172 if (rt) {
d1918542 173 dev = rt->dst.dev;
94e187c0 174 ip6_rt_put(rt);
1da177e4
LT		 175 }
176 } else
414b6c94 177 dev = __dev_get_by_index(net, ifindex);
1da177e4 178
63159f29 179 if (!dev) {
1da177e4
LT		 180 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
181 return -ENODEV;
182 }
183
184 mc_lst->ifindex = dev->ifindex;
c7ea20c9 185 mc_lst->sfmode = mode;
196433c5 186 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 187 mc_lst->sflist = NULL;
188
189 /*
190 * now add/increase the group membership on the device
191 */
192
c7ea20c9 193 err = __ipv6_dev_mc_inc(dev, addr, mode);
1da177e4
LT		 194
195 if (err) {
196 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
1da177e4
LT		 197 return err;
198 }
199
1da177e4 200 mc_lst->next = np->ipv6_mc_list;
456b61bc 201 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
1da177e4 202
46a4dee0
MC		 203 return 0;
204}
c7ea20c9
HL		 205
206int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
207{
208 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
209}
46a4dee0 210EXPORT_SYMBOL(ipv6_sock_mc_join);
1da177e4 211
c7ea20c9
HL		 212int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
213 const struct in6_addr *addr, unsigned int mode)
214{
215 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
216}
217
1da177e4
LT		 218/*
219 * socket leave on multicast group
220 */
54ff9ef3 221int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 222{
223 struct ipv6_pinfo *np = inet6_sk(sk);
456b61bc
ED		 224 struct ipv6_mc_socklist *mc_lst;
225 struct ipv6_mc_socklist __rcu **lnk;
3b1e0a65 226 struct net *net = sock_net(sk);
1da177e4 227
46a4dee0
MC		 228 ASSERT_RTNL();
229
a858d64b
LW		 230 if (!ipv6_addr_is_multicast(addr))
231 return -EINVAL;
232
456b61bc 233 for (lnk = &np->ipv6_mc_list;
b5350916 234 (mc_lst = rtnl_dereference(*lnk)) != NULL;
456b61bc 235 lnk = &mc_lst->next) {
1da177e4
LT		 236 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
237 ipv6_addr_equal(&mc_lst->addr, addr)) {
238 struct net_device *dev;
239
240 *lnk = mc_lst->next;
1da177e4 241
414b6c94 242 dev = __dev_get_by_index(net, mc_lst->ifindex);
53b24b8f 243 if (dev) {
96b52e61 244 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 245
acd6e00b 246 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 247 if (idev)
1da177e4 248 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 249 } else
250 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
a9ed4a29 251
456b61bc 252 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 253 kfree_rcu(mc_lst, rcu);
1da177e4
LT		 254 return 0;
255 }
256 }
1da177e4 257
9951f036 258 return -EADDRNOTAVAIL;
1da177e4 259}
46a4dee0 260EXPORT_SYMBOL(ipv6_sock_mc_drop);
1da177e4 261
96b52e61
ED		 262/* called with rcu_read_lock() */
263static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
b71d1d42 264 const struct in6_addr *group,
96b52e61 265 int ifindex)
1da177e4
LT		 266{
267 struct net_device *dev = NULL;
268 struct inet6_dev *idev = NULL;
269
270 if (ifindex == 0) {
b75cc8f9 271 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
1da177e4 272
1da177e4 273 if (rt) {
d1918542 274 dev = rt->dst.dev;
94e187c0 275 ip6_rt_put(rt);
1da177e4
LT		 276 }
277 } else
96b52e61 278 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 279
280 if (!dev)
96b52e61
ED		 281 return NULL;
282 idev = __in6_dev_get(dev);
448eb71f 283 if (!idev)
8a22c99a 284 return NULL;
1da177e4 285 read_lock_bh(&idev->lock);
96b52e61
ED		 286 if (idev->dead) {
287 read_unlock_bh(&idev->lock);
288 return NULL;
289 }
1da177e4
LT		 290 return idev;
291}
292
8651be8f 293void __ipv6_sock_mc_close(struct sock *sk)
1da177e4
LT		 294{
295 struct ipv6_pinfo *np = inet6_sk(sk);
296 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 297 struct net *net = sock_net(sk);
1da177e4 298
8651be8f 299 ASSERT_RTNL();
0e1efe9d 300
b5350916 301 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
1da177e4
LT		 302 struct net_device *dev;
303
304 np->ipv6_mc_list = mc_lst->next;
1da177e4 305
414b6c94 306 dev = __dev_get_by_index(net, mc_lst->ifindex);
1da177e4 307 if (dev) {
96b52e61 308 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 309
acd6e00b 310 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 311 if (idev)
1da177e4 312 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 313 } else
314 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4 315
456b61bc 316 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 317 kfree_rcu(mc_lst, rcu);
1da177e4 318 }
8651be8f
WC		 319}
320
321void ipv6_sock_mc_close(struct sock *sk)
322{
323 struct ipv6_pinfo *np = inet6_sk(sk);
324
325 if (!rcu_access_pointer(np->ipv6_mc_list))
326 return;
327 rtnl_lock();
328 __ipv6_sock_mc_close(sk);
a9ed4a29 329 rtnl_unlock();
1da177e4
LT		 330}
331
332int ip6_mc_source(int add, int omode, struct sock *sk,
333 struct group_source_req *pgsr)
334{
335 struct in6_addr *source, *group;
336 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 337 struct inet6_dev *idev;
338 struct ipv6_pinfo *inet6 = inet6_sk(sk);
339 struct ip6_sf_socklist *psl;
3b1e0a65 340 struct net *net = sock_net(sk);
1da177e4 341 int i, j, rv;
c9e3e8b6 342 int leavegroup = 0;
5ab4a6c8 343 int pmclocked = 0;
1da177e4
LT		 344 int err;
345
1da177e4
LT		 346 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
347 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
348
349 if (!ipv6_addr_is_multicast(group))
350 return -EINVAL;
351
96b52e61
ED		 352 rcu_read_lock();
353 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
354 if (!idev) {
355 rcu_read_unlock();
1da177e4 356 return -ENODEV;
96b52e61 357 }
1da177e4
LT		 358
359 err = -EADDRNOTAVAIL;
360
456b61bc 361 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 362 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
363 continue;
364 if (ipv6_addr_equal(&pmc->addr, group))
365 break;
366 }
917f2f10
DS		 367 if (!pmc) { /* must have a prior join */
368 err = -EINVAL;
1da177e4 369 goto done;
917f2f10 370 }
1da177e4
LT		 371 /* if a source filter was set, must be the same mode as before */
372 if (pmc->sflist) {
917f2f10
DS		 373 if (pmc->sfmode != omode) {
374 err = -EINVAL;
1da177e4 375 goto done;
917f2f10 376 }
1da177e4
LT		 377 } else if (pmc->sfmode != omode) {
378 /* allow mode switches for empty-set filters */
379 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
380 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
381 pmc->sfmode = omode;
382 }
383
96b52e61 384 write_lock(&pmc->sflock);
5ab4a6c8
DS		 385 pmclocked = 1;
386
1da177e4
LT		 387 psl = pmc->sflist;
388 if (!add) {
389 if (!psl)
917f2f10 390 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 391 rv = !0;
67ba4152 392 for (i = 0; i < psl->sl_count; i++) {
07c2fecc 393 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
1da177e4
LT		 394 if (rv == 0)
395 break;
396 }
397 if (rv) /* source not found */
917f2f10 398 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 399
c9e3e8b6
DS		 400 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
401 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
402 leavegroup = 1;
403 goto done;
404 }
405
1da177e4
LT		 406 /* update the interface filter */
407 ip6_mc_del_src(idev, group, omode, 1, source, 1);
408
67ba4152 409 for (j = i+1; j < psl->sl_count; j++)
1da177e4
LT		 410 psl->sl_addr[j-1] = psl->sl_addr[j];
411 psl->sl_count--;
412 err = 0;
413 goto done;
414 }
415 /* else, add a new source to the filter */
416
417 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
418 err = -ENOBUFS;
419 goto done;
420 }
421 if (!psl || psl->sl_count == psl->sl_max) {
422 struct ip6_sf_socklist *newpsl;
423 int count = IP6_SFBLOCK;
424
425 if (psl)
426 count += psl->sl_max;
8b3a7005 427 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 428 if (!newpsl) {
429 err = -ENOBUFS;
430 goto done;
431 }
432 newpsl->sl_max = count;
433 newpsl->sl_count = count - IP6_SFBLOCK;
434 if (psl) {
67ba4152 435 for (i = 0; i < psl->sl_count; i++)
1da177e4
LT		 436 newpsl->sl_addr[i] = psl->sl_addr[i];
437 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
438 }
439 pmc->sflist = psl = newpsl;
440 }
441 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
67ba4152 442 for (i = 0; i < psl->sl_count; i++) {
07c2fecc 443 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
56db1c5f
JS		 444 if (rv == 0) /* There is an error in the address. */
445 goto done;
1da177e4 446 }
67ba4152 447 for (j = psl->sl_count-1; j >= i; j--)
1da177e4
LT		 448 psl->sl_addr[j+1] = psl->sl_addr[j];
449 psl->sl_addr[i] = *source;
450 psl->sl_count++;
451 err = 0;
452 /* update the interface list */
453 ip6_mc_add_src(idev, group, omode, 1, source, 1);
454done:
5ab4a6c8 455 if (pmclocked)
96b52e61 456 write_unlock(&pmc->sflock);
1da177e4 457 read_unlock_bh(&idev->lock);
96b52e61 458 rcu_read_unlock();
c9e3e8b6 459 if (leavegroup)
54ff9ef3 460 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 461 return err;
462}
463
464int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
465{
b71d1d42 466 const struct in6_addr *group;
1da177e4 467 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 468 struct inet6_dev *idev;
469 struct ipv6_pinfo *inet6 = inet6_sk(sk);
470 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 471 struct net *net = sock_net(sk);
9951f036 472 int leavegroup = 0;
1da177e4
LT		 473 int i, err;
474
475 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
476
477 if (!ipv6_addr_is_multicast(group))
478 return -EINVAL;
479 if (gsf->gf_fmode != MCAST_INCLUDE &&
480 gsf->gf_fmode != MCAST_EXCLUDE)
481 return -EINVAL;
482
96b52e61
ED		 483 rcu_read_lock();
484 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 485
96b52e61
ED		 486 if (!idev) {
487 rcu_read_unlock();
1da177e4 488 return -ENODEV;
96b52e61 489 }
1da177e4 490
9c05989b 491 err = 0;
5ab4a6c8 492
9951f036
DS		 493 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
494 leavegroup = 1;
495 goto done;
496 }
497
456b61bc 498 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 499 if (pmc->ifindex != gsf->gf_interface)
500 continue;
501 if (ipv6_addr_equal(&pmc->addr, group))
502 break;
503 }
917f2f10
DS		 504 if (!pmc) { /* must have a prior join */
505 err = -EINVAL;
1da177e4 506 goto done;
917f2f10 507 }
1da177e4 508 if (gsf->gf_numsrc) {
8b3a7005
KK		 509 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
510 GFP_ATOMIC);
1da177e4
LT		 511 if (!newpsl) {
512 err = -ENOBUFS;
513 goto done;
514 }
515 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
67ba4152 516 for (i = 0; i < newpsl->sl_count; ++i) {
1da177e4
LT		 517 struct sockaddr_in6 *psin6;
518
519 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
520 newpsl->sl_addr[i] = psin6->sin6_addr;
521 }
522 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
523 newpsl->sl_count, newpsl->sl_addr, 0);
524 if (err) {
525 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
526 goto done;
527 }
8713dbf0 528 } else {
1da177e4 529 newpsl = NULL;
8713dbf0
YZ		 530 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
531 }
5ab4a6c8 532
96b52e61 533 write_lock(&pmc->sflock);
1da177e4
LT		 534 psl = pmc->sflist;
535 if (psl) {
536 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
537 psl->sl_count, psl->sl_addr, 0);
538 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
539 } else
540 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
541 pmc->sflist = newpsl;
542 pmc->sfmode = gsf->gf_fmode;
96b52e61 543 write_unlock(&pmc->sflock);
917f2f10 544 err = 0;
1da177e4
LT		 545done:
546 read_unlock_bh(&idev->lock);
96b52e61 547 rcu_read_unlock();
9951f036
DS		 548 if (leavegroup)
549 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 550 return err;
551}
552
553int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
554 struct group_filter __user *optval, int __user *optlen)
555{
556 int err, i, count, copycount;
b71d1d42 557 const struct in6_addr *group;
1da177e4
LT		 558 struct ipv6_mc_socklist *pmc;
559 struct inet6_dev *idev;
1da177e4
LT		 560 struct ipv6_pinfo *inet6 = inet6_sk(sk);
561 struct ip6_sf_socklist *psl;
3b1e0a65 562 struct net *net = sock_net(sk);
1da177e4
LT		 563
564 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
565
566 if (!ipv6_addr_is_multicast(group))
567 return -EINVAL;
568
96b52e61
ED		 569 rcu_read_lock();
570 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 571
96b52e61
ED		 572 if (!idev) {
573 rcu_read_unlock();
1da177e4 574 return -ENODEV;
96b52e61 575 }
1da177e4
LT		 576
577 err = -EADDRNOTAVAIL;
f7ed925c
WC		 578 /* changes to the ipv6_mc_list require the socket lock and
579 * rtnl lock. We have the socket lock and rcu read lock,
5ab4a6c8
DS		 580 * so reading the list is safe.
581 */
1da177e4 582
456b61bc 583 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 584 if (pmc->ifindex != gsf->gf_interface)
585 continue;
586 if (ipv6_addr_equal(group, &pmc->addr))
587 break;
588 }
589 if (!pmc) /* must have a prior join */
590 goto done;
591 gsf->gf_fmode = pmc->sfmode;
592 psl = pmc->sflist;
593 count = psl ? psl->sl_count : 0;
594 read_unlock_bh(&idev->lock);
96b52e61 595 rcu_read_unlock();
1da177e4
LT		 596
597 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
598 gsf->gf_numsrc = count;
599 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
600 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
601 return -EFAULT;
602 }
f7ed925c
WC		 603 /* changes to psl require the socket lock, and a write lock
604 * on pmc->sflock. We have the socket lock so reading here is safe.
5ab4a6c8 605 */
67ba4152 606 for (i = 0; i < copycount; i++) {
1da177e4
LT		 607 struct sockaddr_in6 *psin6;
608 struct sockaddr_storage ss;
609
610 psin6 = (struct sockaddr_in6 *)&ss;
611 memset(&ss, 0, sizeof(ss));
612 psin6->sin6_family = AF_INET6;
613 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 614 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 615 return -EFAULT;
616 }
617 return 0;
618done:
619 read_unlock_bh(&idev->lock);
96b52e61 620 rcu_read_unlock();
1da177e4
LT		 621 return err;
622}
623
a50feda5
ED		 624bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
625 const struct in6_addr *src_addr)
1da177e4
LT		 626{
627 struct ipv6_pinfo *np = inet6_sk(sk);
628 struct ipv6_mc_socklist *mc;
629 struct ip6_sf_socklist *psl;
a50feda5 630 bool rv = true;
1da177e4 631
456b61bc
ED		 632 rcu_read_lock();
633 for_each_pmc_rcu(np, mc) {
1da177e4
LT		 634 if (ipv6_addr_equal(&mc->addr, mc_addr))
635 break;
636 }
637 if (!mc) {
456b61bc 638 rcu_read_unlock();
15033f04 639 return np->mc_all;
1da177e4 640 }
5ab4a6c8 641 read_lock(&mc->sflock);
1da177e4
LT		 642 psl = mc->sflist;
643 if (!psl) {
644 rv = mc->sfmode == MCAST_EXCLUDE;
645 } else {
646 int i;
647
67ba4152 648 for (i = 0; i < psl->sl_count; i++) {
1da177e4
LT		 649 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
650 break;
651 }
652 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
a50feda5 653 rv = false;
1da177e4 654 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
a50feda5 655 rv = false;
1da177e4 656 }
5ab4a6c8 657 read_unlock(&mc->sflock);
456b61bc 658 rcu_read_unlock();
1da177e4
LT		 659
660 return rv;
661}
662
0ae0d60a 663static void igmp6_group_added(struct ifmcaddr6 *mc)
1da177e4
LT		 664{
665 struct net_device *dev = mc->idev->dev;
666 char buf[MAX_ADDR_LEN];
667
ec16ef22
YH		 668 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
669 IPV6_ADDR_SCOPE_LINKLOCAL)
670 return;
671
1da177e4
LT		 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
6c567b78 683 if (mld_in_v1_mode(mc->idev)) {
1da177e4
LT		 684 igmp6_join_group(mc);
685 return;
686 }
687 /* else v2 */
688
c7ea20c9
HL		 689 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
690 * should not send filter-mode change record as the mode
691 * should be from IN() to IN(A).
692 */
0ae0d60a 693 if (mc->mca_sfmode == MCAST_EXCLUDE)
c7ea20c9
HL		 694 mc->mca_crcount = mc->idev->mc_qrv;
695
1da177e4
LT		 696 mld_ifc_event(mc->idev);
697}
698
699static void igmp6_group_dropped(struct ifmcaddr6 *mc)
700{
701 struct net_device *dev = mc->idev->dev;
702 char buf[MAX_ADDR_LEN];
703
ec16ef22
YH		 704 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
705 IPV6_ADDR_SCOPE_LINKLOCAL)
706 return;
707
1da177e4
LT		 708 spin_lock_bh(&mc->mca_lock);
709 if (mc->mca_flags&MAF_LOADED) {
710 mc->mca_flags &= ~MAF_LOADED;
711 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 712 dev_mc_del(dev, buf);
1da177e4
LT		 713 }
714
1da177e4 715 spin_unlock_bh(&mc->mca_lock);
1666d49e
HL		 716 if (mc->mca_flags & MAF_NOREPORT)
717 return;
1da177e4
LT		 718
719 if (!mc->idev->dead)
720 igmp6_leave_group(mc);
721
722 spin_lock_bh(&mc->mca_lock);
723 if (del_timer(&mc->mca_timer))
d3981bc6 724 refcount_dec(&mc->mca_refcnt);
1da177e4
LT		 725 spin_unlock_bh(&mc->mca_lock);
726}
727
728/*
729 * deleted ifmcaddr6 manipulation
730 */
731static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
732{
733 struct ifmcaddr6 *pmc;
734
735 /* this is an "ifmcaddr6" for convenience; only the fields below
736 * are actually used. In particular, the refcnt and users are not
737 * used for management of the delete list. Using the same structure
738 * for deleted items allows change reports to use common code with
739 * non-deleted or query-response MCA's.
740 */
0c600eda 741 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 742 if (!pmc)
743 return;
0c600eda 744
1da177e4
LT		 745 spin_lock_bh(&im->mca_lock);
746 spin_lock_init(&pmc->mca_lock);
747 pmc->idev = im->idev;
748 in6_dev_hold(idev);
749 pmc->mca_addr = im->mca_addr;
750 pmc->mca_crcount = idev->mc_qrv;
751 pmc->mca_sfmode = im->mca_sfmode;
752 if (pmc->mca_sfmode == MCAST_INCLUDE) {
753 struct ip6_sf_list *psf;
754
755 pmc->mca_tomb = im->mca_tomb;
756 pmc->mca_sources = im->mca_sources;
757 im->mca_tomb = im->mca_sources = NULL;
67ba4152 758 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
1da177e4
LT		 759 psf->sf_crcount = pmc->mca_crcount;
760 }
761 spin_unlock_bh(&im->mca_lock);
762
6457d26b 763 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 764 pmc->next = idev->mc_tomb;
765 idev->mc_tomb = pmc;
6457d26b 766 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 767}
768
1666d49e 769static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
1da177e4
LT		 770{
771 struct ifmcaddr6 *pmc, *pmc_prev;
1666d49e
HL		 772 struct ip6_sf_list *psf;
773 struct in6_addr *pmca = &im->mca_addr;
1da177e4 774
6457d26b 775 spin_lock_bh(&idev->mc_lock);
1da177e4 776 pmc_prev = NULL;
67ba4152 777 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
1da177e4
LT		 778 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
779 break;
780 pmc_prev = pmc;
781 }
782 if (pmc) {
783 if (pmc_prev)
784 pmc_prev->next = pmc->next;
785 else
786 idev->mc_tomb = pmc->next;
787 }
6457d26b
SH		 788 spin_unlock_bh(&idev->mc_lock);
789
1666d49e 790 spin_lock_bh(&im->mca_lock);
1da177e4 791 if (pmc) {
1666d49e 792 im->idev = pmc->idev;
08d3ffcc 793 if (im->mca_sfmode == MCAST_INCLUDE) {
1666d49e
HL		 794 im->mca_tomb = pmc->mca_tomb;
795 im->mca_sources = pmc->mca_sources;
796 for (psf = im->mca_sources; psf; psf = psf->sf_next)
c7ea20c9
HL		 797 psf->sf_crcount = idev->mc_qrv;
798 } else {
799 im->mca_crcount = idev->mc_qrv;
1da177e4
LT		 800 }
801 in6_dev_put(pmc->idev);
9c8bb163 802 kfree(pmc);
1da177e4 803 }
1666d49e 804 spin_unlock_bh(&im->mca_lock);
1da177e4
LT		 805}
806
807static void mld_clear_delrec(struct inet6_dev *idev)
808{
809 struct ifmcaddr6 *pmc, *nextpmc;
810
6457d26b 811 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 812 pmc = idev->mc_tomb;
813 idev->mc_tomb = NULL;
6457d26b 814 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 815
816 for (; pmc; pmc = nextpmc) {
817 nextpmc = pmc->next;
818 ip6_mc_clear_src(pmc);
819 in6_dev_put(pmc->idev);
820 kfree(pmc);
821 }
822
823 /* clear dead sources, too */
824 read_lock_bh(&idev->lock);
67ba4152 825 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT		 826 struct ip6_sf_list *psf, *psf_next;
827
828 spin_lock_bh(&pmc->mca_lock);
829 psf = pmc->mca_tomb;
830 pmc->mca_tomb = NULL;
831 spin_unlock_bh(&pmc->mca_lock);
67ba4152 832 for (; psf; psf = psf_next) {
1da177e4
LT		 833 psf_next = psf->sf_next;
834 kfree(psf);
835 }
836 }
837 read_unlock_bh(&idev->lock);
838}
839
1691c63e
WC		 840static void mca_get(struct ifmcaddr6 *mc)
841{
d3981bc6 842 refcount_inc(&mc->mca_refcnt);
1691c63e
WC		 843}
844
845static void ma_put(struct ifmcaddr6 *mc)
846{
d3981bc6 847 if (refcount_dec_and_test(&mc->mca_refcnt)) {
1691c63e
WC		 848 in6_dev_put(mc->idev);
849 kfree(mc);
850 }
851}
852
853static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
c7ea20c9
HL		 854 const struct in6_addr *addr,
855 unsigned int mode)
1691c63e
WC		 856{
857 struct ifmcaddr6 *mc;
858
859 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
63159f29 860 if (!mc)
1691c63e
WC		 861 return NULL;
862
e99e88a9 863 timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
1691c63e
WC		 864
865 mc->mca_addr = *addr;
866 mc->idev = idev; /* reference taken by caller */
867 mc->mca_users = 1;
868 /* mca_stamp should be updated upon changes */
869 mc->mca_cstamp = mc->mca_tstamp = jiffies;
d3981bc6 870 refcount_set(&mc->mca_refcnt, 1);
1691c63e
WC		 871 spin_lock_init(&mc->mca_lock);
872
c7ea20c9
HL		 873 mc->mca_sfmode = mode;
874 mc->mca_sfcount[mode] = 1;
1691c63e
WC		 875
876 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
877 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
878 mc->mca_flags |= MAF_NOREPORT;
879
880 return mc;
881}
1da177e4
LT		 882
883/*
884 * device multicast group inc (add if not found)
885 */
c7ea20c9
HL		 886static int __ipv6_dev_mc_inc(struct net_device *dev,
887 const struct in6_addr *addr, unsigned int mode)
1da177e4
LT		 888{
889 struct ifmcaddr6 *mc;
890 struct inet6_dev *idev;
891
a9ed4a29
SD		 892 ASSERT_RTNL();
893
96b52e61 894 /* we need to take a reference on idev */
1da177e4
LT		 895 idev = in6_dev_get(dev);
896
63159f29 897 if (!idev)
1da177e4
LT		 898 return -EINVAL;
899
900 write_lock_bh(&idev->lock);
901 if (idev->dead) {
902 write_unlock_bh(&idev->lock);
903 in6_dev_put(idev);
904 return -ENODEV;
905 }
906
907 for (mc = idev->mc_list; mc; mc = mc->next) {
908 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
909 mc->mca_users++;
910 write_unlock_bh(&idev->lock);
c7ea20c9 911 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
1da177e4
LT		 912 in6_dev_put(idev);
913 return 0;
914 }
915 }
916
c7ea20c9 917 mc = mca_alloc(idev, addr, mode);
1691c63e 918 if (!mc) {
1da177e4
LT		 919 write_unlock_bh(&idev->lock);
920 in6_dev_put(idev);
921 return -ENOMEM;
922 }
923
1da177e4
LT		 924 mc->next = idev->mc_list;
925 idev->mc_list = mc;
1691c63e
WC		 926
927 /* Hold this for the code below before we unlock,
928 * it is already exposed via idev->mc_list.
929 */
930 mca_get(mc);
1da177e4
LT		 931 write_unlock_bh(&idev->lock);
932
1666d49e 933 mld_del_delrec(idev, mc);
0ae0d60a 934 igmp6_group_added(mc);
1da177e4
LT		 935 ma_put(mc);
936 return 0;
937}
938
c7ea20c9
HL		 939int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
940{
941 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
942}
4effd28c 943EXPORT_SYMBOL(ipv6_dev_mc_inc);
c7ea20c9 944
1da177e4
LT		 945/*
946 * device multicast group del
947 */
9acd9f3a 948int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 949{
950 struct ifmcaddr6 *ma, **map;
951
a9ed4a29
SD		 952 ASSERT_RTNL();
953
1da177e4 954 write_lock_bh(&idev->lock);
67ba4152 955 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
1da177e4
LT		 956 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
957 if (--ma->mca_users == 0) {
958 *map = ma->next;
959 write_unlock_bh(&idev->lock);
960
961 igmp6_group_dropped(ma);
1666d49e 962 ip6_mc_clear_src(ma);
1da177e4
LT		 963
964 ma_put(ma);
965 return 0;
966 }
967 write_unlock_bh(&idev->lock);
968 return 0;
969 }
970 }
971 write_unlock_bh(&idev->lock);
972
973 return -ENOENT;
974}
975
9acd9f3a 976int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4 977{
96b52e61 978 struct inet6_dev *idev;
1da177e4
LT		 979 int err;
980
414b6c94 981 ASSERT_RTNL();
1da177e4 982
96b52e61
ED		 983 idev = __in6_dev_get(dev);
984 if (!idev)
985 err = -ENODEV;
986 else
987 err = __ipv6_dev_mc_dec(idev, addr);
1da177e4
LT		 988
989 return err;
990}
4effd28c 991EXPORT_SYMBOL(ipv6_dev_mc_dec);
1da177e4 992
1da177e4
LT		 993/*
994 * check if the interface/address pair is valid
995 */
a50feda5
ED		 996bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
997 const struct in6_addr *src_addr)
1da177e4
LT		 998{
999 struct inet6_dev *idev;
1000 struct ifmcaddr6 *mc;
a50feda5 1001 bool rv = false;
1da177e4 1002
96b52e61
ED		 1003 rcu_read_lock();
1004 idev = __in6_dev_get(dev);
1da177e4
LT		 1005 if (idev) {
1006 read_lock_bh(&idev->lock);
67ba4152 1007 for (mc = idev->mc_list; mc; mc = mc->next) {
1da177e4
LT		 1008 if (ipv6_addr_equal(&mc->mca_addr, group))
1009 break;
1010 }
1011 if (mc) {
1012 if (src_addr && !ipv6_addr_any(src_addr)) {
1013 struct ip6_sf_list *psf;
1014
1015 spin_lock_bh(&mc->mca_lock);
67ba4152 1016 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT		 1017 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1018 break;
1019 }
1020 if (psf)
1021 rv = psf->sf_count[MCAST_INCLUDE] ||
1022 psf->sf_count[MCAST_EXCLUDE] !=
1023 mc->mca_sfcount[MCAST_EXCLUDE];
1024 else
67ba4152 1025 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1da177e4
LT		 1026 spin_unlock_bh(&mc->mca_lock);
1027 } else
a50feda5 1028 rv = true; /* don't filter unspecified source */
1da177e4
LT		 1029 }
1030 read_unlock_bh(&idev->lock);
1da177e4 1031 }
96b52e61 1032 rcu_read_unlock();
1da177e4
LT		 1033 return rv;
1034}
1035
1036static void mld_gq_start_timer(struct inet6_dev *idev)
1037{
63862b5b 1038 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1da177e4
LT		 1039
1040 idev->mc_gq_running = 1;
1041 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1042 in6_dev_hold(idev);
1043}
1044
b4af8def
DB		 1045static void mld_gq_stop_timer(struct inet6_dev *idev)
1046{
1047 idev->mc_gq_running = 0;
1048 if (del_timer(&idev->mc_gq_timer))
1049 __in6_dev_put(idev);
1050}
1051
c2cef4e8 1052static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1da177e4 1053{
63862b5b 1054 unsigned long tv = prandom_u32() % delay;
1da177e4
LT		 1055
1056 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1057 in6_dev_hold(idev);
1058}
1059
b4af8def
DB		 1060static void mld_ifc_stop_timer(struct inet6_dev *idev)
1061{
1062 idev->mc_ifc_count = 0;
1063 if (del_timer(&idev->mc_ifc_timer))
1064 __in6_dev_put(idev);
1065}
1066
c2cef4e8 1067static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
b173ee48 1068{
63862b5b 1069 unsigned long tv = prandom_u32() % delay;
b173ee48
HFS		 1070
1071 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1072 in6_dev_hold(idev);
1073}
1074
b4af8def
DB		 1075static void mld_dad_stop_timer(struct inet6_dev *idev)
1076{
1077 if (del_timer(&idev->mc_dad_timer))
1078 __in6_dev_put(idev);
1079}
1080
1da177e4
LT		 1081/*
1082 * IGMP handling (alias multicast ICMPv6 messages)
1083 */
1084
1085static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1086{
1087 unsigned long delay = resptime;
1088
1089 /* Do not start timer for these addresses */
1090 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1091 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1092 return;
1093
1094 if (del_timer(&ma->mca_timer)) {
d3981bc6 1095 refcount_dec(&ma->mca_refcnt);
1da177e4
LT		 1096 delay = ma->mca_timer.expires - jiffies;
1097 }
1098
cc7f7ab7 1099 if (delay >= resptime)
63862b5b 1100 delay = prandom_u32() % resptime;
cc7f7ab7 1101
1da177e4
LT		 1102 ma->mca_timer.expires = jiffies + delay;
1103 if (!mod_timer(&ma->mca_timer, jiffies + delay))
d3981bc6 1104 refcount_inc(&ma->mca_refcnt);
1da177e4
LT		 1105 ma->mca_flags |= MAF_TIMER_RUNNING;
1106}
1107
5ab4a6c8 1108/* mark EXCLUDE-mode sources */
a50feda5
ED		 1109static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1110 const struct in6_addr *srcs)
1da177e4
LT		 1111{
1112 struct ip6_sf_list *psf;
1113 int i, scount;
1114
1115 scount = 0;
67ba4152 1116 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT		 1117 if (scount == nsrcs)
1118 break;
67ba4152 1119 for (i = 0; i < nsrcs; i++) {
5ab4a6c8 1120 /* skip inactive filters */
e05c4ad3 1121 if (psf->sf_count[MCAST_INCLUDE] ||
5ab4a6c8
DS		 1122 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1123 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 1124 break;
5ab4a6c8
DS		 1125 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1126 scount++;
1127 break;
1128 }
1129 }
1130 }
1131 pmc->mca_flags &= ~MAF_GSQUERY;
1132 if (scount == nsrcs) /* all sources excluded */
a50feda5
ED		 1133 return false;
1134 return true;
5ab4a6c8
DS		 1135}
1136
a50feda5
ED		 1137static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1138 const struct in6_addr *srcs)
5ab4a6c8
DS		 1139{
1140 struct ip6_sf_list *psf;
1141 int i, scount;
1142
1143 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1144 return mld_xmarksources(pmc, nsrcs, srcs);
1145
1146 /* mark INCLUDE-mode sources */
1147
1148 scount = 0;
67ba4152 1149 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
5ab4a6c8
DS		 1150 if (scount == nsrcs)
1151 break;
67ba4152 1152 for (i = 0; i < nsrcs; i++) {
1da177e4
LT		 1153 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1154 psf->sf_gsresp = 1;
1155 scount++;
1156 break;
1157 }
5ab4a6c8
DS		 1158 }
1159 }
1160 if (!scount) {
1161 pmc->mca_flags &= ~MAF_GSQUERY;
a50feda5 1162 return false;
1da177e4 1163 }
5ab4a6c8 1164 pmc->mca_flags |= MAF_GSQUERY;
a50feda5 1165 return true;
1da177e4
LT		 1166}
1167
58c0ecfd
DB		 1168static int mld_force_mld_version(const struct inet6_dev *idev)
1169{
1170 /* Normally, both are 0 here. If enforcement to a particular is
1171 * being used, individual device enforcement will have a lower
1172 * precedence over 'all' device (.../conf/all/force_mld_version).
1173 */
1174
1175 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1176 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1177 else
1178 return idev->cnf.force_mld_version;
1179}
1180
1181static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1182{
1183 return mld_force_mld_version(idev) == 2;
1184}
1185
1186static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1187{
1188 return mld_force_mld_version(idev) == 1;
1189}
1190
6c567b78
DB		 1191static bool mld_in_v1_mode(const struct inet6_dev *idev)
1192{
58c0ecfd
DB		 1193 if (mld_in_v2_mode_only(idev))
1194 return false;
1195 if (mld_in_v1_mode_only(idev))
6c567b78
DB		 1196 return true;
1197 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1198 return true;
1199
1200 return false;
1201}
1202
89225d1c
DB		 1203static void mld_set_v1_mode(struct inet6_dev *idev)
1204{
1205 /* RFC3810, relevant sections:
1206 * - 9.1. Robustness Variable
1207 * - 9.2. Query Interval
1208 * - 9.3. Query Response Interval
1209 * - 9.12. Older Version Querier Present Timeout
1210 */
1211 unsigned long switchback;
1212
1213 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1214
1215 idev->mc_v1_seen = jiffies + switchback;
1216}
1217
1218static void mld_update_qrv(struct inet6_dev *idev,
1219 const struct mld2_query *mlh2)
1220{
1221 /* RFC3810, relevant sections:
1222 * - 5.1.8. QRV (Querier's Robustness Variable)
1223 * - 9.1. Robustness Variable
1224 */
1225
1226 /* The value of the Robustness Variable MUST NOT be zero,
1227 * and SHOULD NOT be one. Catch this here if we ever run
1228 * into such a case in future.
1229 */
2f711939 1230 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
89225d1c
DB		 1231 WARN_ON(idev->mc_qrv == 0);
1232
1233 if (mlh2->mld2q_qrv > 0)
1234 idev->mc_qrv = mlh2->mld2q_qrv;
1235
2f711939 1236 if (unlikely(idev->mc_qrv < min_qrv)) {
89225d1c 1237 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
2f711939
HFS		 1238 idev->mc_qrv, min_qrv);
1239 idev->mc_qrv = min_qrv;
89225d1c
DB		 1240 }
1241}
1242
1243static void mld_update_qi(struct inet6_dev *idev,
1244 const struct mld2_query *mlh2)
1245{
1246 /* RFC3810, relevant sections:
1247 * - 5.1.9. QQIC (Querier's Query Interval Code)
1248 * - 9.2. Query Interval
1249 * - 9.12. Older Version Querier Present Timeout
1250 * (the [Query Interval] in the last Query received)
1251 */
1252 unsigned long mc_qqi;
1253
1254 if (mlh2->mld2q_qqic < 128) {
1255 mc_qqi = mlh2->mld2q_qqic;
1256 } else {
1257 unsigned long mc_man, mc_exp;
1258
1259 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1260 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1261
1262 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1263 }
1264
1265 idev->mc_qi = mc_qqi * HZ;
1266}
1267
1268static void mld_update_qri(struct inet6_dev *idev,
1269 const struct mld2_query *mlh2)
1270{
1271 /* RFC3810, relevant sections:
1272 * - 5.1.3. Maximum Response Code
1273 * - 9.3. Query Response Interval
1274 */
e3f5b170 1275 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
89225d1c
DB		 1276}
1277
2b7c121f 1278static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
35f7aa53 1279 unsigned long *max_delay, bool v1_query)
2b7c121f
DB		 1280{
1281 unsigned long mldv1_md;
1282
1283 /* Ignore v1 queries */
1284 if (mld_in_v2_mode_only(idev))
1285 return -EINVAL;
1286
2b7c121f 1287 mldv1_md = ntohs(mld->mld_maxdelay);
35f7aa53
DB		 1288
1289 /* When in MLDv1 fallback and a MLDv2 router start-up being
1290 * unaware of current MLDv1 operation, the MRC == MRD mapping
1291 * only works when the exponential algorithm is not being
1292 * used (as MLDv1 is unaware of such things).
1293 *
1294 * According to the RFC author, the MLDv2 implementations
1295 * he's aware of all use a MRC < 32768 on start up queries.
1296 *
1297 * Thus, should we *ever* encounter something else larger
1298 * than that, just assume the maximum possible within our
1299 * reach.
1300 */
1301 if (!v1_query)
1302 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1303
2b7c121f
DB		 1304 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1305
35f7aa53
DB		 1306 /* MLDv1 router present: we need to go into v1 mode *only*
1307 * when an MLDv1 query is received as per section 9.12. of
1308 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1309 * queries MUST be of exactly 24 octets.
1310 */
1311 if (v1_query)
1312 mld_set_v1_mode(idev);
2b7c121f
DB		 1313
1314 /* cancel MLDv2 report timer */
b4af8def 1315 mld_gq_stop_timer(idev);
2b7c121f 1316 /* cancel the interface change timer */
b4af8def 1317 mld_ifc_stop_timer(idev);
2b7c121f
DB		 1318 /* clear deleted report items */
1319 mld_clear_delrec(idev);
1320
1321 return 0;
1322}
1323
1324static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1325 unsigned long *max_delay)
1326{
2b7c121f
DB		 1327 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1328
1329 mld_update_qrv(idev, mld);
1330 mld_update_qi(idev, mld);
1331 mld_update_qri(idev, mld);
1332
1333 idev->mc_maxdelay = *max_delay;
1334
1335 return 0;
1336}
1337
96b52e61 1338/* called with rcu_read_lock() */
1da177e4
LT		 1339int igmp6_event_query(struct sk_buff *skb)
1340{
97300b5f 1341 struct mld2_query *mlh2 = NULL;
1da177e4 1342 struct ifmcaddr6 *ma;
b71d1d42 1343 const struct in6_addr *group;
1da177e4
LT		 1344 unsigned long max_delay;
1345 struct inet6_dev *idev;
6e7cb837 1346 struct mld_msg *mld;
1da177e4
LT		 1347 int group_type;
1348 int mark = 0;
2b7c121f 1349 int len, err;
1da177e4
LT		 1350
1351 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1352 return -EINVAL;
1353
1354 /* compute payload length excluding extension headers */
0660e03f 1355 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1356 len -= skb_network_header_len(skb);
1da177e4 1357
e940f5d6
HL		 1358 /* RFC3810 6.2
1359 * Upon reception of an MLD message that contains a Query, the node
1360 * checks if the source address of the message is a valid link-local
1361 * address, if the Hop Limit is set to 1, and if the Router Alert
1362 * option is present in the Hop-By-Hop Options header of the IPv6
1363 * packet. If any of these checks fails, the packet is dropped.
1364 */
1365 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1366 ipv6_hdr(skb)->hop_limit != 1 ||
1367 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1368 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1da177e4
LT		 1369 return -EINVAL;
1370
96b52e61 1371 idev = __in6_dev_get(skb->dev);
63159f29 1372 if (!idev)
1da177e4
LT		 1373 return 0;
1374
6e7cb837
YH		 1375 mld = (struct mld_msg *)icmp6_hdr(skb);
1376 group = &mld->mld_mca;
1da177e4
LT		 1377 group_type = ipv6_addr_type(group);
1378
1379 if (group_type != IPV6_ADDR_ANY &&
96b52e61 1380 !(group_type&IPV6_ADDR_MULTICAST))
1da177e4 1381 return -EINVAL;
1da177e4 1382
35f7aa53
DB		 1383 if (len < MLD_V1_QUERY_LEN) {
1384 return -EINVAL;
1385 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1386 err = mld_process_v1(idev, mld, &max_delay,
1387 len == MLD_V1_QUERY_LEN);
2b7c121f
DB		 1388 if (err < 0)
1389 return err;
9fd07841 1390 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1ab1457c 1391 int srcs_offset = sizeof(struct mld2_query) -
97300b5f 1392 sizeof(struct icmp6hdr);
89225d1c 1393
96b52e61 1394 if (!pskb_may_pull(skb, srcs_offset))
97300b5f 1395 return -EINVAL;
96b52e61 1396
9c70220b 1397 mlh2 = (struct mld2_query *)skb_transport_header(skb);
84698963 1398
2b7c121f
DB		 1399 err = mld_process_v2(idev, mlh2, &max_delay);
1400 if (err < 0)
1401 return err;
89225d1c 1402
1da177e4 1403 if (group_type == IPV6_ADDR_ANY) { /* general query */
96b52e61 1404 if (mlh2->mld2q_nsrcs)
1da177e4 1405 return -EINVAL; /* no sources allowed */
96b52e61 1406
1da177e4 1407 mld_gq_start_timer(idev);
1da177e4
LT		 1408 return 0;
1409 }
1410 /* mark sources to include, if group & source-specific */
6e7cb837 1411 if (mlh2->mld2q_nsrcs != 0) {
1ab1457c 1412 if (!pskb_may_pull(skb, srcs_offset +
96b52e61 1413 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
97300b5f 1414 return -EINVAL;
96b52e61 1415
9c70220b 1416 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1417 mark = 1;
1418 }
35f7aa53 1419 } else {
1da177e4 1420 return -EINVAL;
35f7aa53 1421 }
1da177e4
LT		 1422
1423 read_lock_bh(&idev->lock);
1424 if (group_type == IPV6_ADDR_ANY) {
67ba4152 1425 for (ma = idev->mc_list; ma; ma = ma->next) {
1da177e4
LT		 1426 spin_lock_bh(&ma->mca_lock);
1427 igmp6_group_queried(ma, max_delay);
1428 spin_unlock_bh(&ma->mca_lock);
1429 }
1430 } else {
67ba4152 1431 for (ma = idev->mc_list; ma; ma = ma->next) {
7add2a43 1432 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1433 continue;
1434 spin_lock_bh(&ma->mca_lock);
1435 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1436 /* gsquery <- gsquery && mark */
1437 if (!mark)
1438 ma->mca_flags &= ~MAF_GSQUERY;
1439 } else {
1440 /* gsquery <- mark */
1441 if (mark)
1442 ma->mca_flags |= MAF_GSQUERY;
1443 else
1444 ma->mca_flags &= ~MAF_GSQUERY;
1445 }
5ab4a6c8 1446 if (!(ma->mca_flags & MAF_GSQUERY) ||
6e7cb837 1447 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
5ab4a6c8 1448 igmp6_group_queried(ma, max_delay);
1da177e4 1449 spin_unlock_bh(&ma->mca_lock);
7add2a43 1450 break;
1da177e4
LT		 1451 }
1452 }
1453 read_unlock_bh(&idev->lock);
1da177e4
LT		 1454
1455 return 0;
1456}
1457
96b52e61 1458/* called with rcu_read_lock() */
1da177e4
LT		 1459int igmp6_event_report(struct sk_buff *skb)
1460{
1461 struct ifmcaddr6 *ma;
1da177e4 1462 struct inet6_dev *idev;
6e7cb837 1463 struct mld_msg *mld;
1da177e4
LT		 1464 int addr_type;
1465
1466 /* Our own report looped back. Ignore it. */
1467 if (skb->pkt_type == PACKET_LOOPBACK)
1468 return 0;
1469
24c69275
DS		 1470 /* send our report if the MC router may not have heard this report */
1471 if (skb->pkt_type != PACKET_MULTICAST &&
1472 skb->pkt_type != PACKET_BROADCAST)
1473 return 0;
1474
6e7cb837 1475 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1da177e4
LT		 1476 return -EINVAL;
1477
6e7cb837 1478 mld = (struct mld_msg *)icmp6_hdr(skb);
1da177e4
LT		 1479
1480 /* Drop reports with not link local source */
0660e03f 1481 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1482 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1483 !(addr_type&IPV6_ADDR_LINKLOCAL))
1484 return -EINVAL;
1485
96b52e61 1486 idev = __in6_dev_get(skb->dev);
63159f29 1487 if (!idev)
1da177e4
LT		 1488 return -ENODEV;
1489
1490 /*
1491 * Cancel the timer for this group
1492 */
1493
1494 read_lock_bh(&idev->lock);
67ba4152 1495 for (ma = idev->mc_list; ma; ma = ma->next) {
6e7cb837 1496 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1da177e4
LT		 1497 spin_lock(&ma->mca_lock);
1498 if (del_timer(&ma->mca_timer))
d3981bc6 1499 refcount_dec(&ma->mca_refcnt);
1da177e4
LT		 1500 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1501 spin_unlock(&ma->mca_lock);
1502 break;
1503 }
1504 }
1505 read_unlock_bh(&idev->lock);
1da177e4
LT		 1506 return 0;
1507}
1508
a50feda5
ED		 1509static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1510 int gdeleted, int sdeleted)
1da177e4
LT		 1511{
1512 switch (type) {
1513 case MLD2_MODE_IS_INCLUDE:
1514 case MLD2_MODE_IS_EXCLUDE:
1515 if (gdeleted || sdeleted)
a50feda5 1516 return false;
5ab4a6c8
DS		 1517 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1518 if (pmc->mca_sfmode == MCAST_INCLUDE)
a50feda5 1519 return true;
5ab4a6c8
DS		 1520 /* don't include if this source is excluded
1521 * in all filters
1522 */
1523 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1524 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1525 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1526 psf->sf_count[MCAST_EXCLUDE];
1527 }
a50feda5 1528 return false;
1da177e4
LT		 1529 case MLD2_CHANGE_TO_INCLUDE:
1530 if (gdeleted || sdeleted)
a50feda5 1531 return false;
1da177e4
LT		 1532 return psf->sf_count[MCAST_INCLUDE] != 0;
1533 case MLD2_CHANGE_TO_EXCLUDE:
1534 if (gdeleted || sdeleted)
a50feda5 1535 return false;
1da177e4
LT		 1536 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1537 psf->sf_count[MCAST_INCLUDE])
a50feda5 1538 return false;
1da177e4
LT		 1539 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1540 psf->sf_count[MCAST_EXCLUDE];
1541 case MLD2_ALLOW_NEW_SOURCES:
1542 if (gdeleted || !psf->sf_crcount)
a50feda5 1543 return false;
1da177e4
LT		 1544 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1545 case MLD2_BLOCK_OLD_SOURCES:
1546 if (pmc->mca_sfmode == MCAST_INCLUDE)
1547 return gdeleted || (psf->sf_crcount && sdeleted);
1548 return psf->sf_crcount && !gdeleted && !sdeleted;
1549 }
a50feda5 1550 return false;
1da177e4
LT		 1551}
1552
1553static int
1554mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1555{
1556 struct ip6_sf_list *psf;
1557 int scount = 0;
1558
67ba4152 1559 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT		 1560 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1561 continue;
1562 scount++;
1563 }
1564 return scount;
1565}
1566
2576f17d
YH		 1567static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1568 struct net_device *dev,
1569 const struct in6_addr *saddr,
1570 const struct in6_addr *daddr,
1571 int proto, int len)
1572{
1573 struct ipv6hdr *hdr;
1574
1575 skb->protocol = htons(ETH_P_IPV6);
1576 skb->dev = dev;
1577
1578 skb_reset_network_header(skb);
1579 skb_put(skb, sizeof(struct ipv6hdr));
1580 hdr = ipv6_hdr(skb);
1581
1582 ip6_flow_hdr(hdr, 0, 0);
1583
1584 hdr->payload_len = htons(len);
1585 hdr->nexthdr = proto;
1586 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1587
1588 hdr->saddr = *saddr;
1589 hdr->daddr = *daddr;
1590}
1591
4c672e4b 1592static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1da177e4 1593{
8965779d 1594 struct net_device *dev = idev->dev;
c346dca1 1595 struct net *net = dev_net(dev);
b8ad0cbc 1596 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1597 struct sk_buff *skb;
1598 struct mld2_report *pmr;
1599 struct in6_addr addr_buf;
d7aabf22 1600 const struct in6_addr *saddr;
a7ae1992
HX		 1601 int hlen = LL_RESERVED_SPACE(dev);
1602 int tlen = dev->needed_tailroom;
4c672e4b 1603 unsigned int size = mtu + hlen + tlen;
1da177e4
LT		 1604 int err;
1605 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1606 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1607 IPV6_TLV_PADN, 0 };
1608
1609 /* we assume size > sizeof(ra) here */
72e09ad1
ED		 1610 /* limit our allocations to order-0 page */
1611 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1612 skb = sock_alloc_send_skb(sk, size, 1, &err);
1da177e4 1613
cfcabdcc 1614 if (!skb)
1da177e4
LT		 1615 return NULL;
1616
9d4a0314 1617 skb->priority = TC_PRIO_CONTROL;
a7ae1992 1618 skb_reserve(skb, hlen);
1837b2e2 1619 skb_tailroom_reserve(skb, mtu, tlen);
1da177e4 1620
8965779d 1621 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1622 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1623 * use unspecified address as the source address
1da177e4
LT		 1624 * when a valid link-local address is not available.
1625 */
d7aabf22
YH		 1626 saddr = &in6addr_any;
1627 } else
1628 saddr = &addr_buf;
1da177e4 1629
2576f17d 1630 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4 1631
59ae1d12 1632 skb_put_data(skb, ra, sizeof(ra));
1da177e4 1633
27a884dc 1634 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1635 skb_put(skb, sizeof(*pmr));
1636 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837
YH		 1637 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1638 pmr->mld2r_resv1 = 0;
1639 pmr->mld2r_cksum = 0;
1640 pmr->mld2r_resv2 = 0;
1641 pmr->mld2r_ngrec = 0;
1da177e4
LT		 1642 return skb;
1643}
1644
1645static void mld_sendpack(struct sk_buff *skb)
1646{
0660e03f 1647 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1648 struct mld2_report *pmr =
1649 (struct mld2_report *)skb_transport_header(skb);
1da177e4 1650 int payload_len, mldlen;
96b52e61 1651 struct inet6_dev *idev;
c346dca1 1652 struct net *net = dev_net(skb->dev);
1da177e4 1653 int err;
4c9483b2 1654 struct flowi6 fl6;
adf30907 1655 struct dst_entry *dst;
1da177e4 1656
96b52e61
ED		 1657 rcu_read_lock();
1658 idev = __in6_dev_get(skb->dev);
edf391ff
NH		 1659 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1660
29a3cad5
SH		 1661 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1662 sizeof(*pip6);
1663 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1da177e4
LT		 1664 pip6->payload_len = htons(payload_len);
1665
6e7cb837
YH		 1666 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1667 IPPROTO_ICMPV6,
1668 csum_partial(skb_transport_header(skb),
1669 mldlen, 0));
41927178 1670
4c9483b2 1671 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
41927178
YH		 1672 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1673 skb->dev->ifindex);
12fd84f4 1674 dst = icmp6_dst_alloc(skb->dev, &fl6);
41927178 1675
452edd59
DM		 1676 err = 0;
1677 if (IS_ERR(dst)) {
1678 err = PTR_ERR(dst);
1679 dst = NULL;
1680 }
adf30907 1681 skb_dst_set(skb, dst);
41927178
YH		 1682 if (err)
1683 goto err_out;
1684
7026b1dd 1685 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
29a26a56 1686 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
13206b6b 1687 dst_output);
41927178 1688out:
1da177e4 1689 if (!err) {
43a43b60
HFS		 1690 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1691 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
43a43b60
HFS		 1692 } else {
1693 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1694 }
1da177e4 1695
96b52e61 1696 rcu_read_unlock();
41927178
YH		 1697 return;
1698
1699err_out:
1700 kfree_skb(skb);
1701 goto out;
1da177e4
LT		 1702}
1703
1704static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1705{
fab10fe3 1706 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1707}
1708
1709static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
b9b312a7 1710 int type, struct mld2_grec **ppgr, unsigned int mtu)
1da177e4 1711{
1da177e4
LT		 1712 struct mld2_report *pmr;
1713 struct mld2_grec *pgr;
1714
b9b312a7
ED		 1715 if (!skb) {
1716 skb = mld_newpack(pmc->idev, mtu);
1717 if (!skb)
1718 return NULL;
1719 }
4df864c1 1720 pgr = skb_put(skb, sizeof(struct mld2_grec));
1da177e4
LT		 1721 pgr->grec_type = type;
1722 pgr->grec_auxwords = 0;
1723 pgr->grec_nsrcs = 0;
1724 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1725 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1726 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT		 1727 *ppgr = pgr;
1728 return skb;
1729}
1730
4c672e4b 1731#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1da177e4
LT		 1732
1733static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
6a7cc418 1734 int type, int gdeleted, int sdeleted, int crsend)
1da177e4 1735{
8965779d
AW		 1736 struct inet6_dev *idev = pmc->idev;
1737 struct net_device *dev = idev->dev;
1da177e4
LT		 1738 struct mld2_report *pmr;
1739 struct mld2_grec *pgr = NULL;
1740 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1741 int scount, stotal, first, isquery, truncate;
b9b312a7 1742 unsigned int mtu;
1da177e4
LT		 1743
1744 if (pmc->mca_flags & MAF_NOREPORT)
1745 return skb;
1746
b9b312a7
ED		 1747 mtu = READ_ONCE(dev->mtu);
1748 if (mtu < IPV6_MIN_MTU)
1749 return skb;
1750
1da177e4
LT		 1751 isquery = type == MLD2_MODE_IS_INCLUDE ||
1752 type == MLD2_MODE_IS_EXCLUDE;
1753 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1754 type == MLD2_CHANGE_TO_EXCLUDE;
1755
5ab4a6c8
DS		 1756 stotal = scount = 0;
1757
1da177e4
LT		 1758 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1759
5ab4a6c8
DS		 1760 if (!*psf_list)
1761 goto empty_source;
1762
9c70220b 1763 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1764
1765 /* EX and TO_EX get a fresh packet, if needed */
1766 if (truncate) {
6e7cb837 1767 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT		 1768 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1769 if (skb)
1770 mld_sendpack(skb);
b9b312a7 1771 skb = mld_newpack(idev, mtu);
1da177e4
LT		 1772 }
1773 }
1774 first = 1;
1da177e4 1775 psf_prev = NULL;
67ba4152 1776 for (psf = *psf_list; psf; psf = psf_next) {
1da177e4
LT		 1777 struct in6_addr *psrc;
1778
1779 psf_next = psf->sf_next;
1780
c7ea20c9 1781 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1da177e4
LT		 1782 psf_prev = psf;
1783 continue;
1784 }
1785
a052517a
HL		 1786 /* Based on RFC3810 6.1. Should not send source-list change
1787 * records when there is a filter mode change.
1788 */
1789 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1790 (!gdeleted && pmc->mca_crcount)) &&
1791 (type == MLD2_ALLOW_NEW_SOURCES ||
1792 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1793 goto decrease_sf_crcount;
1794
1da177e4
LT		 1795 /* clear marks on query responses */
1796 if (isquery)
1797 psf->sf_gsresp = 0;
1798
1799 if (AVAILABLE(skb) < sizeof(*psrc) +
1800 first*sizeof(struct mld2_grec)) {
1801 if (truncate && !first)
1802 break; /* truncate these */
1803 if (pgr)
1804 pgr->grec_nsrcs = htons(scount);
1805 if (skb)
1806 mld_sendpack(skb);
b9b312a7 1807 skb = mld_newpack(idev, mtu);
1da177e4
LT		 1808 first = 1;
1809 scount = 0;
1810 }
1811 if (first) {
b9b312a7 1812 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1da177e4
LT		 1813 first = 0;
1814 }
cc63f70b
AD		 1815 if (!skb)
1816 return NULL;
4df864c1 1817 psrc = skb_put(skb, sizeof(*psrc));
1da177e4 1818 *psrc = psf->sf_addr;
5ab4a6c8 1819 scount++; stotal++;
1da177e4
LT		 1820 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1821 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
a052517a 1822decrease_sf_crcount:
1da177e4
LT		 1823 psf->sf_crcount--;
1824 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1825 if (psf_prev)
1826 psf_prev->sf_next = psf->sf_next;
1827 else
1828 *psf_list = psf->sf_next;
1829 kfree(psf);
1830 continue;
1831 }
1832 }
1833 psf_prev = psf;
1834 }
5ab4a6c8
DS		 1835
1836empty_source:
1837 if (!stotal) {
1838 if (type == MLD2_ALLOW_NEW_SOURCES ||
1839 type == MLD2_BLOCK_OLD_SOURCES)
1840 return skb;
6a7cc418 1841 if (pmc->mca_crcount || isquery || crsend) {
5ab4a6c8
DS		 1842 /* make sure we have room for group header */
1843 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1844 mld_sendpack(skb);
1845 skb = NULL; /* add_grhead will get a new one */
1846 }
b9b312a7 1847 skb = add_grhead(skb, pmc, type, &pgr, mtu);
5ab4a6c8
DS		 1848 }
1849 }
1da177e4
LT		 1850 if (pgr)
1851 pgr->grec_nsrcs = htons(scount);
1852
1853 if (isquery)
1854 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1855 return skb;
1856}
1857
1858static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1859{
1860 struct sk_buff *skb = NULL;
1861 int type;
1862
8965779d 1863 read_lock_bh(&idev->lock);
1da177e4 1864 if (!pmc) {
67ba4152 1865 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT		 1866 if (pmc->mca_flags & MAF_NOREPORT)
1867 continue;
1868 spin_lock_bh(&pmc->mca_lock);
1869 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1870 type = MLD2_MODE_IS_EXCLUDE;
1871 else
1872 type = MLD2_MODE_IS_INCLUDE;
6a7cc418 1873 skb = add_grec(skb, pmc, type, 0, 0, 0);
1da177e4
LT		 1874 spin_unlock_bh(&pmc->mca_lock);
1875 }
1da177e4
LT		 1876 } else {
1877 spin_lock_bh(&pmc->mca_lock);
1878 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1879 type = MLD2_MODE_IS_EXCLUDE;
1880 else
1881 type = MLD2_MODE_IS_INCLUDE;
6a7cc418 1882 skb = add_grec(skb, pmc, type, 0, 0, 0);
1da177e4
LT		 1883 spin_unlock_bh(&pmc->mca_lock);
1884 }
8965779d 1885 read_unlock_bh(&idev->lock);
1da177e4
LT		 1886 if (skb)
1887 mld_sendpack(skb);
1888}
1889
1890/*
1891 * remove zero-count source records from a source filter list
1892 */
1893static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1894{
1895 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1896
1897 psf_prev = NULL;
67ba4152 1898 for (psf = *ppsf; psf; psf = psf_next) {
1da177e4
LT		 1899 psf_next = psf->sf_next;
1900 if (psf->sf_crcount == 0) {
1901 if (psf_prev)
1902 psf_prev->sf_next = psf->sf_next;
1903 else
1904 *ppsf = psf->sf_next;
1905 kfree(psf);
1906 } else
1907 psf_prev = psf;
1908 }
1909}
1910
1911static void mld_send_cr(struct inet6_dev *idev)
1912{
1913 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1914 struct sk_buff *skb = NULL;
1915 int type, dtype;
1916
1917 read_lock_bh(&idev->lock);
6457d26b 1918 spin_lock(&idev->mc_lock);
1da177e4
LT		 1919
1920 /* deleted MCA's */
1921 pmc_prev = NULL;
67ba4152 1922 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1da177e4
LT		 1923 pmc_next = pmc->next;
1924 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1925 type = MLD2_BLOCK_OLD_SOURCES;
1926 dtype = MLD2_BLOCK_OLD_SOURCES;
6a7cc418
FL		 1927 skb = add_grec(skb, pmc, type, 1, 0, 0);
1928 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1da177e4
LT		 1929 }
1930 if (pmc->mca_crcount) {
1da177e4
LT		 1931 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1932 type = MLD2_CHANGE_TO_INCLUDE;
6a7cc418 1933 skb = add_grec(skb, pmc, type, 1, 0, 0);
1da177e4 1934 }
5ab4a6c8 1935 pmc->mca_crcount--;
1da177e4
LT		 1936 if (pmc->mca_crcount == 0) {
1937 mld_clear_zeros(&pmc->mca_tomb);
1938 mld_clear_zeros(&pmc->mca_sources);
1939 }
1940 }
1941 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1942 !pmc->mca_sources) {
1943 if (pmc_prev)
1944 pmc_prev->next = pmc_next;
1945 else
1946 idev->mc_tomb = pmc_next;
1947 in6_dev_put(pmc->idev);
1948 kfree(pmc);
1949 } else
1950 pmc_prev = pmc;
1951 }
6457d26b 1952 spin_unlock(&idev->mc_lock);
1da177e4
LT		 1953
1954 /* change recs */
67ba4152 1955 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT		 1956 spin_lock_bh(&pmc->mca_lock);
1957 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1958 type = MLD2_BLOCK_OLD_SOURCES;
1959 dtype = MLD2_ALLOW_NEW_SOURCES;
1960 } else {
1961 type = MLD2_ALLOW_NEW_SOURCES;
1962 dtype = MLD2_BLOCK_OLD_SOURCES;
1963 }
6a7cc418
FL		 1964 skb = add_grec(skb, pmc, type, 0, 0, 0);
1965 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1da177e4
LT		 1966
1967 /* filter mode changes */
1968 if (pmc->mca_crcount) {
1da177e4
LT		 1969 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1970 type = MLD2_CHANGE_TO_EXCLUDE;
1971 else
1972 type = MLD2_CHANGE_TO_INCLUDE;
6a7cc418 1973 skb = add_grec(skb, pmc, type, 0, 0, 0);
5ab4a6c8 1974 pmc->mca_crcount--;
1da177e4
LT		 1975 }
1976 spin_unlock_bh(&pmc->mca_lock);
1977 }
1978 read_unlock_bh(&idev->lock);
1979 if (!skb)
1980 return;
1981 (void) mld_sendpack(skb);
1982}
1983
1984static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1985{
c346dca1 1986 struct net *net = dev_net(dev);
b8ad0cbc 1987 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1988 struct inet6_dev *idev;
1ab1457c 1989 struct sk_buff *skb;
6e7cb837 1990 struct mld_msg *hdr;
d7aabf22 1991 const struct in6_addr *snd_addr, *saddr;
1da177e4 1992 struct in6_addr addr_buf;
a7ae1992
HX		 1993 int hlen = LL_RESERVED_SPACE(dev);
1994 int tlen = dev->needed_tailroom;
1da177e4
LT		 1995 int err, len, payload_len, full_len;
1996 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1997 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1998 IPV6_TLV_PADN, 0 };
4c9483b2 1999 struct flowi6 fl6;
adf30907 2000 struct dst_entry *dst;
1da177e4 2001
f3ee4010
YH		 2002 if (type == ICMPV6_MGM_REDUCTION)
2003 snd_addr = &in6addr_linklocal_allrouters;
2004 else
2005 snd_addr = addr;
1da177e4
LT		 2006
2007 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2008 payload_len = len + sizeof(ra);
2009 full_len = sizeof(struct ipv6hdr) + payload_len;
2010
edf391ff
NH		 2011 rcu_read_lock();
2012 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2013 IPSTATS_MIB_OUT, full_len);
2014 rcu_read_unlock();
2015
a7ae1992 2016 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1da177e4 2017
63159f29 2018 if (!skb) {
a11d206d 2019 rcu_read_lock();
3bd653c8 2020 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 2021 IPSTATS_MIB_OUTDISCARDS);
2022 rcu_read_unlock();
1da177e4
LT		 2023 return;
2024 }
9d4a0314 2025 skb->priority = TC_PRIO_CONTROL;
a7ae1992 2026 skb_reserve(skb, hlen);
1da177e4 2027
95c385b4 2028 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 2029 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 2030 * use unspecified address as the source address
1da177e4
LT		 2031 * when a valid link-local address is not available.
2032 */
d7aabf22
YH		 2033 saddr = &in6addr_any;
2034 } else
2035 saddr = &addr_buf;
1da177e4 2036
2576f17d 2037 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4 2038
59ae1d12 2039 skb_put_data(skb, ra, sizeof(ra));
1da177e4 2040
b080db58 2041 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
6e7cb837 2042 hdr->mld_type = type;
4e3fd7a0 2043 hdr->mld_mca = *addr;
1da177e4 2044
6e7cb837
YH		 2045 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2046 IPPROTO_ICMPV6,
2047 csum_partial(hdr, len, 0));
1da177e4 2048
96b52e61
ED		 2049 rcu_read_lock();
2050 idev = __in6_dev_get(skb->dev);
1da177e4 2051
4c9483b2 2052 icmpv6_flow_init(sk, &fl6, type,
41927178
YH		 2053 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2054 skb->dev->ifindex);
12fd84f4 2055 dst = icmp6_dst_alloc(skb->dev, &fl6);
452edd59
DM		 2056 if (IS_ERR(dst)) {
2057 err = PTR_ERR(dst);
41927178 2058 goto err_out;
452edd59 2059 }
41927178 2060
adf30907 2061 skb_dst_set(skb, dst);
29a26a56
EB		 2062 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2063 net, sk, skb, NULL, skb->dev,
13206b6b 2064 dst_output);
41927178 2065out:
1da177e4 2066 if (!err) {
5c5d244b 2067 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 2068 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4 2069 } else
3bd653c8 2070 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 2071
96b52e61 2072 rcu_read_unlock();
1da177e4 2073 return;
41927178
YH		 2074
2075err_out:
2076 kfree_skb(skb);
2077 goto out;
1da177e4
LT		 2078}
2079
6a7cc418 2080static void mld_send_initial_cr(struct inet6_dev *idev)
b173ee48 2081{
6a7cc418
FL		 2082 struct sk_buff *skb;
2083 struct ifmcaddr6 *pmc;
2084 int type;
2085
2086 if (mld_in_v1_mode(idev))
2087 return;
2088
2089 skb = NULL;
2090 read_lock_bh(&idev->lock);
67ba4152 2091 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
6a7cc418
FL		 2092 spin_lock_bh(&pmc->mca_lock);
2093 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2094 type = MLD2_CHANGE_TO_EXCLUDE;
2095 else
c7ea20c9 2096 type = MLD2_ALLOW_NEW_SOURCES;
6a7cc418
FL		 2097 skb = add_grec(skb, pmc, type, 0, 0, 1);
2098 spin_unlock_bh(&pmc->mca_lock);
b173ee48 2099 }
6a7cc418
FL		 2100 read_unlock_bh(&idev->lock);
2101 if (skb)
2102 mld_sendpack(skb);
b173ee48
HFS		 2103}
2104
2105void ipv6_mc_dad_complete(struct inet6_dev *idev)
2106{
2107 idev->mc_dad_count = idev->mc_qrv;
2108 if (idev->mc_dad_count) {
6a7cc418 2109 mld_send_initial_cr(idev);
b173ee48
HFS		 2110 idev->mc_dad_count--;
2111 if (idev->mc_dad_count)
6c6da928
HL		 2112 mld_dad_start_timer(idev,
2113 unsolicited_report_interval(idev));
b173ee48
HFS		 2114 }
2115}
2116
e99e88a9 2117static void mld_dad_timer_expire(struct timer_list *t)
b173ee48 2118{
e99e88a9 2119 struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
b173ee48 2120
6a7cc418 2121 mld_send_initial_cr(idev);
b173ee48
HFS		 2122 if (idev->mc_dad_count) {
2123 idev->mc_dad_count--;
2124 if (idev->mc_dad_count)
6c6da928
HL		 2125 mld_dad_start_timer(idev,
2126 unsolicited_report_interval(idev));
b173ee48 2127 }
9260d3e1 2128 in6_dev_put(idev);
b173ee48
HFS		 2129}
2130
1da177e4 2131static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
b71d1d42 2132 const struct in6_addr *psfsrc)
1da177e4
LT		 2133{
2134 struct ip6_sf_list *psf, *psf_prev;
2135 int rv = 0;
2136
2137 psf_prev = NULL;
67ba4152 2138 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT		 2139 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2140 break;
2141 psf_prev = psf;
2142 }
2143 if (!psf || psf->sf_count[sfmode] == 0) {
2144 /* source filter not found, or count wrong => bug */
2145 return -ESRCH;
2146 }
2147 psf->sf_count[sfmode]--;
2148 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2149 struct inet6_dev *idev = pmc->idev;
2150
2151 /* no more filters for this source */
2152 if (psf_prev)
2153 psf_prev->sf_next = psf->sf_next;
2154 else
2155 pmc->mca_sources = psf->sf_next;
2156 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
6c567b78 2157 !mld_in_v1_mode(idev)) {
1da177e4
LT		 2158 psf->sf_crcount = idev->mc_qrv;
2159 psf->sf_next = pmc->mca_tomb;
2160 pmc->mca_tomb = psf;
2161 rv = 1;
2162 } else
2163 kfree(psf);
2164 }
2165 return rv;
2166}
2167
b71d1d42
ED		 2168static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2169 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 2170 int delta)
2171{
2172 struct ifmcaddr6 *pmc;
2173 int changerec = 0;
2174 int i, err;
2175
2176 if (!idev)
2177 return -ENODEV;
2178 read_lock_bh(&idev->lock);
67ba4152 2179 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT		 2180 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2181 break;
2182 }
2183 if (!pmc) {
2184 /* MCA not found?? bug */
2185 read_unlock_bh(&idev->lock);
2186 return -ESRCH;
2187 }
2188 spin_lock_bh(&pmc->mca_lock);
2189 sf_markstate(pmc);
2190 if (!delta) {
2191 if (!pmc->mca_sfcount[sfmode]) {
2192 spin_unlock_bh(&pmc->mca_lock);
2193 read_unlock_bh(&idev->lock);
2194 return -EINVAL;
2195 }
2196 pmc->mca_sfcount[sfmode]--;
2197 }
2198 err = 0;
67ba4152 2199 for (i = 0; i < sfcount; i++) {
1da177e4
LT		 2200 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2201
2202 changerec |= rv > 0;
2203 if (!err && rv < 0)
2204 err = rv;
2205 }
2206 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2207 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2208 pmc->mca_sfcount[MCAST_INCLUDE]) {
2209 struct ip6_sf_list *psf;
2210
2211 /* filter mode change */
2212 pmc->mca_sfmode = MCAST_INCLUDE;
2213 pmc->mca_crcount = idev->mc_qrv;
2214 idev->mc_ifc_count = pmc->mca_crcount;
67ba4152 2215 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
1da177e4
LT		 2216 psf->sf_crcount = 0;
2217 mld_ifc_event(pmc->idev);
2218 } else if (sf_setstate(pmc) || changerec)
2219 mld_ifc_event(pmc->idev);
2220 spin_unlock_bh(&pmc->mca_lock);
2221 read_unlock_bh(&idev->lock);
2222 return err;
2223}
2224
2225/*
2226 * Add multicast single-source filter to the interface list
2227 */
2228static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
99d2f47a 2229 const struct in6_addr *psfsrc)
1da177e4
LT		 2230{
2231 struct ip6_sf_list *psf, *psf_prev;
2232
2233 psf_prev = NULL;
67ba4152 2234 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT		 2235 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2236 break;
2237 psf_prev = psf;
2238 }
2239 if (!psf) {
0c600eda 2240 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 2241 if (!psf)
2242 return -ENOBUFS;
0c600eda 2243
1da177e4
LT		 2244 psf->sf_addr = *psfsrc;
2245 if (psf_prev) {
2246 psf_prev->sf_next = psf;
2247 } else
2248 pmc->mca_sources = psf;
2249 }
2250 psf->sf_count[sfmode]++;
2251 return 0;
2252}
2253
2254static void sf_markstate(struct ifmcaddr6 *pmc)
2255{
2256 struct ip6_sf_list *psf;
2257 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2258
67ba4152 2259 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
1da177e4
LT		 2260 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2261 psf->sf_oldin = mca_xcount ==
2262 psf->sf_count[MCAST_EXCLUDE] &&
2263 !psf->sf_count[MCAST_INCLUDE];
2264 } else
2265 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2266}
2267
2268static int sf_setstate(struct ifmcaddr6 *pmc)
2269{
7add2a43 2270 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2271 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2272 int qrv = pmc->idev->mc_qrv;
2273 int new_in, rv;
2274
2275 rv = 0;
67ba4152 2276 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1da177e4
LT		 2277 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2278 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2279 !psf->sf_count[MCAST_INCLUDE];
2280 } else
2281 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2282 if (new_in) {
2283 if (!psf->sf_oldin) {
e80e28b6 2284 struct ip6_sf_list *prev = NULL;
7add2a43 2285
67ba4152
IM		 2286 for (dpsf = pmc->mca_tomb; dpsf;
2287 dpsf = dpsf->sf_next) {
7add2a43
DS		 2288 if (ipv6_addr_equal(&dpsf->sf_addr,
2289 &psf->sf_addr))
2290 break;
2291 prev = dpsf;
2292 }
2293 if (dpsf) {
2294 if (prev)
2295 prev->sf_next = dpsf->sf_next;
2296 else
2297 pmc->mca_tomb = dpsf->sf_next;
2298 kfree(dpsf);
2299 }
2300 psf->sf_crcount = qrv;
2301 rv++;
2302 }
2303 } else if (psf->sf_oldin) {
2304 psf->sf_crcount = 0;
2305 /*
2306 * add or update "delete" records if an active filter
2307 * is now inactive
2308 */
67ba4152 2309 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
7add2a43
DS		 2310 if (ipv6_addr_equal(&dpsf->sf_addr,
2311 &psf->sf_addr))
2312 break;
2313 if (!dpsf) {
5d55354f 2314 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
7add2a43
DS		 2315 if (!dpsf)
2316 continue;
2317 *dpsf = *psf;
2318 /* pmc->mca_lock held by callers */
2319 dpsf->sf_next = pmc->mca_tomb;
2320 pmc->mca_tomb = dpsf;
2321 }
2322 dpsf->sf_crcount = qrv;
1da177e4
LT		 2323 rv++;
2324 }
2325 }
2326 return rv;
2327}
2328
2329/*
2330 * Add multicast source filter list to the interface list
2331 */
b71d1d42
ED		 2332static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2333 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 2334 int delta)
2335{
2336 struct ifmcaddr6 *pmc;
2337 int isexclude;
2338 int i, err;
2339
2340 if (!idev)
2341 return -ENODEV;
2342 read_lock_bh(&idev->lock);
67ba4152 2343 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1da177e4
LT		 2344 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2345 break;
2346 }
2347 if (!pmc) {
2348 /* MCA not found?? bug */
2349 read_unlock_bh(&idev->lock);
2350 return -ESRCH;
2351 }
2352 spin_lock_bh(&pmc->mca_lock);
2353
2354 sf_markstate(pmc);
2355 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2356 if (!delta)
2357 pmc->mca_sfcount[sfmode]++;
2358 err = 0;
67ba4152 2359 for (i = 0; i < sfcount; i++) {
99d2f47a 2360 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 2361 if (err)
2362 break;
2363 }
2364 if (err) {
2365 int j;
2366
2367 if (!delta)
2368 pmc->mca_sfcount[sfmode]--;
67ba4152 2369 for (j = 0; j < i; j++)
78d50217 2370 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4 2371 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2372 struct ip6_sf_list *psf;
2373
2374 /* filter mode change */
2375 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2376 pmc->mca_sfmode = MCAST_EXCLUDE;
2377 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2378 pmc->mca_sfmode = MCAST_INCLUDE;
2379 /* else no filters; keep old mode for reports */
2380
2381 pmc->mca_crcount = idev->mc_qrv;
2382 idev->mc_ifc_count = pmc->mca_crcount;
67ba4152 2383 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
1da177e4
LT		 2384 psf->sf_crcount = 0;
2385 mld_ifc_event(idev);
2386 } else if (sf_setstate(pmc))
2387 mld_ifc_event(idev);
2388 spin_unlock_bh(&pmc->mca_lock);
2389 read_unlock_bh(&idev->lock);
2390 return err;
2391}
2392
2393static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2394{
2395 struct ip6_sf_list *psf, *nextpsf;
2396
67ba4152 2397 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
1da177e4
LT		 2398 nextpsf = psf->sf_next;
2399 kfree(psf);
2400 }
2401 pmc->mca_tomb = NULL;
67ba4152 2402 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
1da177e4
LT		 2403 nextpsf = psf->sf_next;
2404 kfree(psf);
2405 }
2406 pmc->mca_sources = NULL;
2407 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2408 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2409 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2410}
2411
2412
2413static void igmp6_join_group(struct ifmcaddr6 *ma)
2414{
2415 unsigned long delay;
2416
2417 if (ma->mca_flags & MAF_NOREPORT)
2418 return;
2419
2420 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2421
63862b5b 2422 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
1da177e4
LT		 2423
2424 spin_lock_bh(&ma->mca_lock);
2425 if (del_timer(&ma->mca_timer)) {
d3981bc6 2426 refcount_dec(&ma->mca_refcnt);
1da177e4
LT		 2427 delay = ma->mca_timer.expires - jiffies;
2428 }
2429
2430 if (!mod_timer(&ma->mca_timer, jiffies + delay))
d3981bc6 2431 refcount_inc(&ma->mca_refcnt);
1da177e4
LT		 2432 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2433 spin_unlock_bh(&ma->mca_lock);
2434}
2435
2436static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2437 struct inet6_dev *idev)
2438{
2439 int err;
2440
dc012f36 2441 write_lock_bh(&iml->sflock);
cfcabdcc 2442 if (!iml->sflist) {
1da177e4 2443 /* any-source empty exclude case */
dc012f36
ED		 2444 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2445 } else {
2446 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2447 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2448 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2449 iml->sflist = NULL;
1da177e4 2450 }
dc012f36 2451 write_unlock_bh(&iml->sflock);
1da177e4
LT		 2452 return err;
2453}
2454
2455static void igmp6_leave_group(struct ifmcaddr6 *ma)
2456{
6c567b78 2457 if (mld_in_v1_mode(ma->idev)) {
1da177e4
LT		 2458 if (ma->mca_flags & MAF_LAST_REPORTER)
2459 igmp6_send(&ma->mca_addr, ma->idev->dev,
2460 ICMPV6_MGM_REDUCTION);
2461 } else {
2462 mld_add_delrec(ma->idev, ma);
2463 mld_ifc_event(ma->idev);
2464 }
2465}
2466
e99e88a9 2467static void mld_gq_timer_expire(struct timer_list *t)
1da177e4 2468{
e99e88a9 2469 struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
1da177e4
LT		 2470
2471 idev->mc_gq_running = 0;
2472 mld_send_report(idev, NULL);
9260d3e1 2473 in6_dev_put(idev);
1da177e4
LT		 2474}
2475
e99e88a9 2476static void mld_ifc_timer_expire(struct timer_list *t)
1da177e4 2477{
e99e88a9 2478 struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
1da177e4
LT		 2479
2480 mld_send_cr(idev);
2481 if (idev->mc_ifc_count) {
2482 idev->mc_ifc_count--;
2483 if (idev->mc_ifc_count)
6c6da928
HL		 2484 mld_ifc_start_timer(idev,
2485 unsolicited_report_interval(idev));
1da177e4 2486 }
9260d3e1 2487 in6_dev_put(idev);
1da177e4
LT		 2488}
2489
2490static void mld_ifc_event(struct inet6_dev *idev)
2491{
6c567b78 2492 if (mld_in_v1_mode(idev))
1da177e4
LT		 2493 return;
2494 idev->mc_ifc_count = idev->mc_qrv;
2495 mld_ifc_start_timer(idev, 1);
2496}
2497
e99e88a9 2498static void igmp6_timer_handler(struct timer_list *t)
1da177e4 2499{
e99e88a9 2500 struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
1da177e4 2501
6c567b78 2502 if (mld_in_v1_mode(ma->idev))
1da177e4
LT		 2503 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2504 else
2505 mld_send_report(ma->idev, ma);
2506
2507 spin_lock(&ma->mca_lock);
2508 ma->mca_flags |= MAF_LAST_REPORTER;
2509 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2510 spin_unlock(&ma->mca_lock);
2511 ma_put(ma);
2512}
2513
75c78500
MS		 2514/* Device changing type */
2515
2516void ipv6_mc_unmap(struct inet6_dev *idev)
2517{
2518 struct ifmcaddr6 *i;
2519
2520 /* Install multicast list, except for all-nodes (already installed) */
2521
2522 read_lock_bh(&idev->lock);
2523 for (i = idev->mc_list; i; i = i->next)
2524 igmp6_group_dropped(i);
2525 read_unlock_bh(&idev->lock);
2526}
2527
2528void ipv6_mc_remap(struct inet6_dev *idev)
2529{
2530 ipv6_mc_up(idev);
2531}
2532
1da177e4
LT		 2533/* Device going down */
2534
2535void ipv6_mc_down(struct inet6_dev *idev)
2536{
2537 struct ifmcaddr6 *i;
2538
2539 /* Withdraw multicast list */
2540
2541 read_lock_bh(&idev->lock);
1da177e4 2542
67ba4152 2543 for (i = idev->mc_list; i; i = i->next)
1da177e4 2544 igmp6_group_dropped(i);
1da177e4 2545
1666d49e
HL		 2546 /* Should stop timer after group drop. or we will
2547 * start timer again in mld_ifc_event()
2548 */
2549 mld_ifc_stop_timer(idev);
2550 mld_gq_stop_timer(idev);
2551 mld_dad_stop_timer(idev);
2552 read_unlock_bh(&idev->lock);
1da177e4
LT		 2553}
2554
2f711939
HFS		 2555static void ipv6_mc_reset(struct inet6_dev *idev)
2556{
2557 idev->mc_qrv = sysctl_mld_qrv;
2558 idev->mc_qi = MLD_QI_DEFAULT;
2559 idev->mc_qri = MLD_QRI_DEFAULT;
2560 idev->mc_v1_seen = 0;
2561 idev->mc_maxdelay = unsolicited_report_interval(idev);
2562}
1da177e4
LT		 2563
2564/* Device going up */
2565
2566void ipv6_mc_up(struct inet6_dev *idev)
2567{
2568 struct ifmcaddr6 *i;
2569
2570 /* Install multicast list, except for all-nodes (already installed) */
2571
2572 read_lock_bh(&idev->lock);
2f711939 2573 ipv6_mc_reset(idev);
1666d49e
HL		 2574 for (i = idev->mc_list; i; i = i->next) {
2575 mld_del_delrec(idev, i);
0ae0d60a 2576 igmp6_group_added(i);
1666d49e 2577 }
1da177e4
LT		 2578 read_unlock_bh(&idev->lock);
2579}
2580
2581/* IPv6 device initialization. */
2582
2583void ipv6_mc_init_dev(struct inet6_dev *idev)
2584{
1da177e4 2585 write_lock_bh(&idev->lock);
6457d26b 2586 spin_lock_init(&idev->mc_lock);
1da177e4 2587 idev->mc_gq_running = 0;
e99e88a9 2588 timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
1da177e4
LT		 2589 idev->mc_tomb = NULL;
2590 idev->mc_ifc_count = 0;
e99e88a9
KC		 2591 timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2592 timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2f711939 2593 ipv6_mc_reset(idev);
1da177e4 2594 write_unlock_bh(&idev->lock);
1da177e4
LT		 2595}
2596
2597/*
2598 * Device is about to be destroyed: clean up.
2599 */
2600
2601void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2602{
2603 struct ifmcaddr6 *i;
1da177e4
LT		 2604
2605 /* Deactivate timers */
2606 ipv6_mc_down(idev);
1666d49e 2607 mld_clear_delrec(idev);
1da177e4
LT		 2608
2609 /* Delete all-nodes address. */
1da177e4
LT		 2610 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2611 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2612 * fail.
2613 */
f3ee4010 2614 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2615
f3ee4010
YH		 2616 if (idev->cnf.forwarding)
2617 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2618
2619 write_lock_bh(&idev->lock);
2620 while ((i = idev->mc_list) != NULL) {
2621 idev->mc_list = i->next;
1da177e4 2622
1666d49e 2623 write_unlock_bh(&idev->lock);
1da177e4 2624 ma_put(i);
1da177e4
LT		 2625 write_lock_bh(&idev->lock);
2626 }
2627 write_unlock_bh(&idev->lock);
2628}
2629
382ed724
VY		 2630static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2631{
2632 struct ifmcaddr6 *pmc;
2633
2634 ASSERT_RTNL();
2635
2636 if (mld_in_v1_mode(idev)) {
2637 read_lock_bh(&idev->lock);
2638 for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2639 igmp6_join_group(pmc);
2640 read_unlock_bh(&idev->lock);
2641 } else
2642 mld_send_report(idev, NULL);
2643}
2644
2645static int ipv6_mc_netdev_event(struct notifier_block *this,
2646 unsigned long event,
2647 void *ptr)
2648{
2649 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2650 struct inet6_dev *idev = __in6_dev_get(dev);
2651
2652 switch (event) {
2653 case NETDEV_RESEND_IGMP:
2654 if (idev)
2655 ipv6_mc_rejoin_groups(idev);
2656 break;
2657 default:
2658 break;
2659 }
2660
2661 return NOTIFY_DONE;
2662}
2663
2664static struct notifier_block igmp6_netdev_notifier = {
2665 .notifier_call = ipv6_mc_netdev_event,
2666};
2667
1da177e4
LT		 2668#ifdef CONFIG_PROC_FS
2669struct igmp6_mc_iter_state {
b8ad0cbc 2670 struct seq_net_private p;
1da177e4
LT		 2671 struct net_device *dev;
2672 struct inet6_dev *idev;
2673};
2674
2675#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2676
2677static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2678{
2679 struct ifmcaddr6 *im = NULL;
2680 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2681 struct net *net = seq_file_net(seq);
1da177e4 2682
7562f876 2683 state->idev = NULL;
ce81b76a 2684 for_each_netdev_rcu(net, state->dev) {
1da177e4 2685 struct inet6_dev *idev;
ce81b76a 2686 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2687 if (!idev)
2688 continue;
2689 read_lock_bh(&idev->lock);
2690 im = idev->mc_list;
2691 if (im) {
2692 state->idev = idev;
2693 break;
2694 }
2695 read_unlock_bh(&idev->lock);
1da177e4
LT		 2696 }
2697 return im;
2698}
2699
2700static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2701{
2702 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2703
2704 im = im->next;
2705 while (!im) {
53b24b8f 2706 if (likely(state->idev))
1da177e4 2707 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2708
2709 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2710 if (!state->dev) {
2711 state->idev = NULL;
2712 break;
2713 }
ce81b76a 2714 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2715 if (!state->idev)
2716 continue;
2717 read_lock_bh(&state->idev->lock);
2718 im = state->idev->mc_list;
2719 }
2720 return im;
2721}
2722
2723static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2724{
2725 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2726 if (im)
2727 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2728 --pos;
2729 return pos ? NULL : im;
2730}
2731
2732static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2733 __acquires(RCU)
1da177e4 2734{
ce81b76a 2735 rcu_read_lock();
1da177e4
LT		 2736 return igmp6_mc_get_idx(seq, *pos);
2737}
2738
2739static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2740{
ce81b76a
ED		 2741 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2742
1da177e4
LT		 2743 ++*pos;
2744 return im;
2745}
2746
2747static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2748 __releases(RCU)
1da177e4
LT		 2749{
2750 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2751
53b24b8f 2752 if (likely(state->idev)) {
1da177e4 2753 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2754 state->idev = NULL;
2755 }
2756 state->dev = NULL;
ce81b76a 2757 rcu_read_unlock();
1da177e4
LT		 2758}
2759
2760static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2761{
2762 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2763 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2764
2765 seq_printf(seq,
4b7a4274 2766 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2767 state->dev->ifindex, state->dev->name,
b071195d 2768 &im->mca_addr,
1da177e4
LT		 2769 im->mca_users, im->mca_flags,
2770 (im->mca_flags&MAF_TIMER_RUNNING) ?
2771 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2772 return 0;
2773}
2774
56b3d975 2775static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2776 .start = igmp6_mc_seq_start,
2777 .next = igmp6_mc_seq_next,
2778 .stop = igmp6_mc_seq_stop,
2779 .show = igmp6_mc_seq_show,
2780};
2781
1da177e4 2782struct igmp6_mcf_iter_state {
b8ad0cbc 2783 struct seq_net_private p;
1da177e4
LT		 2784 struct net_device *dev;
2785 struct inet6_dev *idev;
2786 struct ifmcaddr6 *im;
2787};
2788
2789#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2790
2791static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2792{
2793 struct ip6_sf_list *psf = NULL;
2794 struct ifmcaddr6 *im = NULL;
2795 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2796 struct net *net = seq_file_net(seq);
1da177e4 2797
7562f876
PE		 2798 state->idev = NULL;
2799 state->im = NULL;
ce81b76a 2800 for_each_netdev_rcu(net, state->dev) {
1da177e4 2801 struct inet6_dev *idev;
ce81b76a 2802 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2803 if (unlikely(idev == NULL))
2804 continue;
2805 read_lock_bh(&idev->lock);
2806 im = idev->mc_list;
53b24b8f 2807 if (likely(im)) {
1da177e4
LT		 2808 spin_lock_bh(&im->mca_lock);
2809 psf = im->mca_sources;
53b24b8f 2810 if (likely(psf)) {
1da177e4
LT		 2811 state->im = im;
2812 state->idev = idev;
2813 break;
2814 }
2815 spin_unlock_bh(&im->mca_lock);
2816 }
2817 read_unlock_bh(&idev->lock);
1da177e4
LT		 2818 }
2819 return psf;
2820}
2821
2822static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2823{
2824 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2825
2826 psf = psf->sf_next;
2827 while (!psf) {
2828 spin_unlock_bh(&state->im->mca_lock);
2829 state->im = state->im->next;
2830 while (!state->im) {
53b24b8f 2831 if (likely(state->idev))
1da177e4 2832 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2833
2834 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2835 if (!state->dev) {
2836 state->idev = NULL;
2837 goto out;
2838 }
ce81b76a 2839 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2840 if (!state->idev)
2841 continue;
2842 read_lock_bh(&state->idev->lock);
2843 state->im = state->idev->mc_list;
2844 }
2845 if (!state->im)
2846 break;
2847 spin_lock_bh(&state->im->mca_lock);
2848 psf = state->im->mca_sources;
2849 }
2850out:
2851 return psf;
2852}
2853
2854static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2855{
2856 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2857 if (psf)
2858 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2859 --pos;
2860 return pos ? NULL : psf;
2861}
2862
2863static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2864 __acquires(RCU)
1da177e4 2865{
ce81b76a 2866 rcu_read_lock();
1da177e4
LT		 2867 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2868}
2869
2870static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2871{
2872 struct ip6_sf_list *psf;
2873 if (v == SEQ_START_TOKEN)
2874 psf = igmp6_mcf_get_first(seq);
2875 else
2876 psf = igmp6_mcf_get_next(seq, v);
2877 ++*pos;
2878 return psf;
2879}
2880
2881static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2882 __releases(RCU)
1da177e4
LT		 2883{
2884 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
53b24b8f 2885 if (likely(state->im)) {
1da177e4
LT		 2886 spin_unlock_bh(&state->im->mca_lock);
2887 state->im = NULL;
2888 }
53b24b8f 2889 if (likely(state->idev)) {
1da177e4 2890 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2891 state->idev = NULL;
2892 }
2893 state->dev = NULL;
ce81b76a 2894 rcu_read_unlock();
1da177e4
LT		 2895}
2896
2897static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2898{
2899 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2900 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2901
2902 if (v == SEQ_START_TOKEN) {
1744bea1 2903 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
1da177e4
LT		 2904 } else {
2905 seq_printf(seq,
4b7a4274 2906 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2907 state->dev->ifindex, state->dev->name,
b071195d
HH		 2908 &state->im->mca_addr,
2909 &psf->sf_addr,
1da177e4
LT		 2910 psf->sf_count[MCAST_INCLUDE],
2911 psf->sf_count[MCAST_EXCLUDE]);
2912 }
2913 return 0;
2914}
2915
56b3d975 2916static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2917 .start = igmp6_mcf_seq_start,
2918 .next = igmp6_mcf_seq_next,
2919 .stop = igmp6_mcf_seq_stop,
2920 .show = igmp6_mcf_seq_show,
2921};
2922
2c8c1e72 2923static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 2924{
2925 int err;
2926
2927 err = -ENOMEM;
c3506372
CH		 2928 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
2929 sizeof(struct igmp6_mc_iter_state)))
ea82edf7 2930 goto out;
c3506372
CH		 2931 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
2932 &igmp6_mcf_seq_ops,
2933 sizeof(struct igmp6_mcf_iter_state)))
ea82edf7
DL		 2934 goto out_proc_net_igmp6;
2935
2936 err = 0;
2937out:
2938 return err;
2939
2940out_proc_net_igmp6:
ece31ffd 2941 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 2942 goto out;
2943}
2944
2c8c1e72 2945static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7 2946{
ece31ffd
G		 2947 remove_proc_entry("mcfilter6", net->proc_net);
2948 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 2949}
2950#else
2c8c1e72 2951static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 2952{
2953 return 0;
2954}
2c8c1e72 2955static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2956{
ea82edf7 2957}
1da177e4
LT		 2958#endif
2959
2c8c1e72 2960static int __net_init igmp6_net_init(struct net *net)
1da177e4 2961{
1da177e4
LT		 2962 int err;
2963
1ed8516f
DL		 2964 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2965 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4 2966 if (err < 0) {
f3213831 2967 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
1da177e4 2968 err);
b8ad0cbc 2969 goto out;
1da177e4
LT		 2970 }
2971
1ed8516f 2972 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2973
93a714d6
MC		 2974 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2975 SOCK_RAW, IPPROTO_ICMPV6, net);
2976 if (err < 0) {
2977 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2978 err);
2979 goto out_sock_create;
2980 }
2981
ea82edf7
DL		 2982 err = igmp6_proc_init(net);
2983 if (err)
93a714d6
MC		 2984 goto out_sock_create_autojoin;
2985
2986 return 0;
b8ad0cbc 2987
93a714d6
MC		 2988out_sock_create_autojoin:
2989 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
b8ad0cbc 2990out_sock_create:
1ed8516f 2991 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
93a714d6
MC		 2992out:
2993 return err;
1da177e4
LT		 2994}
2995
2c8c1e72 2996static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2997{
1ed8516f 2998 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
93a714d6 2999 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
ea82edf7 3000 igmp6_proc_exit(net);
1da177e4 3001}
b8ad0cbc
DL		 3002
3003static struct pernet_operations igmp6_net_ops = {
3004 .init = igmp6_net_init,
3005 .exit = igmp6_net_exit,
3006};
3007
3008int __init igmp6_init(void)
3009{
3010 return register_pernet_subsys(&igmp6_net_ops);
3011}
3012
382ed724
VY		 3013int __init igmp6_late_init(void)
3014{
3015 return register_netdevice_notifier(&igmp6_netdev_notifier);
3016}
3017
b8ad0cbc
DL		 3018void igmp6_cleanup(void)
3019{
3020 unregister_pernet_subsys(&igmp6_net_ops);
3021}
382ed724
VY		 3022
3023void igmp6_late_cleanup(void)
3024{
3025 unregister_netdevice_notifier(&igmp6_netdev_notifier);
3026}
Linux 6.x block layer and io_uring tree(s)