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net: ipv6: igmp6_event_query: use msecs_to_jiffies
[linux-2.6-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
67/* Set to 3 to get tracing... */
68#define MCAST_DEBUG 2
69
70#if MCAST_DEBUG >= 3
71#define MDBG(x) printk x
72#else
73#define MDBG(x)
74#endif
75
6e7cb837
YH		 76/* Ensure that we have struct in6_addr aligned on 32bit word. */
77static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
80 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
1da177e4
LT		 81};
82
83static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
84
85/* Big mc list lock for all the sockets */
456b61bc 86static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
1da177e4 87
1da177e4
LT		 88static void igmp6_join_group(struct ifmcaddr6 *ma);
89static void igmp6_leave_group(struct ifmcaddr6 *ma);
90static void igmp6_timer_handler(unsigned long data);
91
92static void mld_gq_timer_expire(unsigned long data);
93static void mld_ifc_timer_expire(unsigned long data);
94static void mld_ifc_event(struct inet6_dev *idev);
95static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
b71d1d42 96static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
1da177e4
LT		 97static void mld_clear_delrec(struct inet6_dev *idev);
98static int sf_setstate(struct ifmcaddr6 *pmc);
99static void sf_markstate(struct ifmcaddr6 *pmc);
100static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
b71d1d42
ED		 101static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
102 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4 103 int delta);
b71d1d42
ED		 104static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
105 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 106 int delta);
107static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
108 struct inet6_dev *idev);
109
110
1da177e4
LT		 111#define MLD_QRV_DEFAULT 2
112
53b7997f 113#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
1da177e4
LT		 114 (idev)->cnf.force_mld_version == 1 || \
115 ((idev)->mc_v1_seen && \
116 time_before(jiffies, (idev)->mc_v1_seen)))
117
6f4353d8 118#define IPV6_MLD_MAX_MSF 64
1da177e4 119
ab32ea5d 120int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 121
122/*
123 * socket join on multicast group
124 */
125
456b61bc
ED		 126#define for_each_pmc_rcu(np, pmc) \
127 for (pmc = rcu_dereference(np->ipv6_mc_list); \
128 pmc != NULL; \
129 pmc = rcu_dereference(pmc->next))
130
fc4eba58
HFS		 131static int unsolicited_report_interval(struct inet6_dev *idev)
132{
133 int iv;
134
135 if (MLD_V1_SEEN(idev))
136 iv = idev->cnf.mldv1_unsolicited_report_interval;
137 else
138 iv = idev->cnf.mldv2_unsolicited_report_interval;
139
140 return iv > 0 ? iv : 1;
141}
142
9acd9f3a 143int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 144{
145 struct net_device *dev = NULL;
146 struct ipv6_mc_socklist *mc_lst;
147 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 148 struct net *net = sock_net(sk);
1da177e4
LT		 149 int err;
150
151 if (!ipv6_addr_is_multicast(addr))
152 return -EINVAL;
153
456b61bc
ED		 154 rcu_read_lock();
155 for_each_pmc_rcu(np, mc_lst) {
c9e3e8b6
DS		 156 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
157 ipv6_addr_equal(&mc_lst->addr, addr)) {
456b61bc 158 rcu_read_unlock();
c9e3e8b6
DS		 159 return -EADDRINUSE;
160 }
161 }
456b61bc 162 rcu_read_unlock();
c9e3e8b6 163
1da177e4
LT		 164 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
165
166 if (mc_lst == NULL)
167 return -ENOMEM;
168
169 mc_lst->next = NULL;
4e3fd7a0 170 mc_lst->addr = *addr;
1da177e4 171
96b52e61 172 rcu_read_lock();
1da177e4
LT		 173 if (ifindex == 0) {
174 struct rt6_info *rt;
b8ad0cbc 175 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4 176 if (rt) {
d1918542 177 dev = rt->dst.dev;
94e187c0 178 ip6_rt_put(rt);
1da177e4
LT		 179 }
180 } else
96b52e61 181 dev = dev_get_by_index_rcu(net, ifindex);
1da177e4
LT		 182
183 if (dev == NULL) {
96b52e61 184 rcu_read_unlock();
1da177e4
LT		 185 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
186 return -ENODEV;
187 }
188
189 mc_lst->ifindex = dev->ifindex;
190 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 191 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 192 mc_lst->sflist = NULL;
193
194 /*
195 * now add/increase the group membership on the device
196 */
197
198 err = ipv6_dev_mc_inc(dev, addr);
199
200 if (err) {
96b52e61 201 rcu_read_unlock();
1da177e4 202 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
1da177e4
LT		 203 return err;
204 }
205
456b61bc 206 spin_lock(&ipv6_sk_mc_lock);
1da177e4 207 mc_lst->next = np->ipv6_mc_list;
456b61bc
ED		 208 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
209 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 210
96b52e61 211 rcu_read_unlock();
1da177e4
LT		 212
213 return 0;
214}
215
216/*
217 * socket leave on multicast group
218 */
9acd9f3a 219int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 220{
221 struct ipv6_pinfo *np = inet6_sk(sk);
456b61bc
ED		 222 struct ipv6_mc_socklist *mc_lst;
223 struct ipv6_mc_socklist __rcu **lnk;
3b1e0a65 224 struct net *net = sock_net(sk);
1da177e4 225
a858d64b
LW		 226 if (!ipv6_addr_is_multicast(addr))
227 return -EINVAL;
228
456b61bc
ED		 229 spin_lock(&ipv6_sk_mc_lock);
230 for (lnk = &np->ipv6_mc_list;
231 (mc_lst = rcu_dereference_protected(*lnk,
232 lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
233 lnk = &mc_lst->next) {
1da177e4
LT		 234 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
235 ipv6_addr_equal(&mc_lst->addr, addr)) {
236 struct net_device *dev;
237
238 *lnk = mc_lst->next;
456b61bc 239 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 240
96b52e61
ED		 241 rcu_read_lock();
242 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
b8ad0cbc 243 if (dev != NULL) {
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);
96b52e61 251 rcu_read_unlock();
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 }
456b61bc 257 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 258
9951f036 259 return -EADDRNOTAVAIL;
1da177e4
LT		 260}
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) {
96b52e61 271 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 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
293void ipv6_sock_mc_close(struct sock *sk)
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
0e1efe9d
ED		 299 if (!rcu_access_pointer(np->ipv6_mc_list))
300 return;
301
456b61bc
ED		 302 spin_lock(&ipv6_sk_mc_lock);
303 while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
304 lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
1da177e4
LT		 305 struct net_device *dev;
306
307 np->ipv6_mc_list = mc_lst->next;
456b61bc 308 spin_unlock(&ipv6_sk_mc_lock);
1da177e4 309
96b52e61
ED		 310 rcu_read_lock();
311 dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
1da177e4 312 if (dev) {
96b52e61 313 struct inet6_dev *idev = __in6_dev_get(dev);
1da177e4 314
acd6e00b 315 (void) ip6_mc_leave_src(sk, mc_lst, idev);
96b52e61 316 if (idev)
1da177e4 317 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
acd6e00b
DS		 318 } else
319 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
96b52e61 320 rcu_read_unlock();
1da177e4 321
456b61bc 322 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
e3cbf28f 323 kfree_rcu(mc_lst, rcu);
456b61bc
ED		 324
325 spin_lock(&ipv6_sk_mc_lock);
1da177e4 326 }
456b61bc 327 spin_unlock(&ipv6_sk_mc_lock);
1da177e4
LT		 328}
329
330int ip6_mc_source(int add, int omode, struct sock *sk,
331 struct group_source_req *pgsr)
332{
333 struct in6_addr *source, *group;
334 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 335 struct inet6_dev *idev;
336 struct ipv6_pinfo *inet6 = inet6_sk(sk);
337 struct ip6_sf_socklist *psl;
3b1e0a65 338 struct net *net = sock_net(sk);
1da177e4 339 int i, j, rv;
c9e3e8b6 340 int leavegroup = 0;
5ab4a6c8 341 int pmclocked = 0;
1da177e4
LT		 342 int err;
343
1da177e4
LT		 344 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
345 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
346
347 if (!ipv6_addr_is_multicast(group))
348 return -EINVAL;
349
96b52e61
ED		 350 rcu_read_lock();
351 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
352 if (!idev) {
353 rcu_read_unlock();
1da177e4 354 return -ENODEV;
96b52e61 355 }
1da177e4
LT		 356
357 err = -EADDRNOTAVAIL;
358
456b61bc 359 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 360 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
361 continue;
362 if (ipv6_addr_equal(&pmc->addr, group))
363 break;
364 }
917f2f10
DS		 365 if (!pmc) { /* must have a prior join */
366 err = -EINVAL;
1da177e4 367 goto done;
917f2f10 368 }
1da177e4
LT		 369 /* if a source filter was set, must be the same mode as before */
370 if (pmc->sflist) {
917f2f10
DS		 371 if (pmc->sfmode != omode) {
372 err = -EINVAL;
1da177e4 373 goto done;
917f2f10 374 }
1da177e4
LT		 375 } else if (pmc->sfmode != omode) {
376 /* allow mode switches for empty-set filters */
377 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
378 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
379 pmc->sfmode = omode;
380 }
381
96b52e61 382 write_lock(&pmc->sflock);
5ab4a6c8
DS		 383 pmclocked = 1;
384
1da177e4
LT		 385 psl = pmc->sflist;
386 if (!add) {
387 if (!psl)
917f2f10 388 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 389 rv = !0;
390 for (i=0; i<psl->sl_count; i++) {
07c2fecc 391 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
1da177e4
LT		 392 if (rv == 0)
393 break;
394 }
395 if (rv) /* source not found */
917f2f10 396 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 397
c9e3e8b6
DS		 398 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
399 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
400 leavegroup = 1;
401 goto done;
402 }
403
1da177e4
LT		 404 /* update the interface filter */
405 ip6_mc_del_src(idev, group, omode, 1, source, 1);
406
407 for (j=i+1; j<psl->sl_count; j++)
408 psl->sl_addr[j-1] = psl->sl_addr[j];
409 psl->sl_count--;
410 err = 0;
411 goto done;
412 }
413 /* else, add a new source to the filter */
414
415 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
416 err = -ENOBUFS;
417 goto done;
418 }
419 if (!psl || psl->sl_count == psl->sl_max) {
420 struct ip6_sf_socklist *newpsl;
421 int count = IP6_SFBLOCK;
422
423 if (psl)
424 count += psl->sl_max;
8b3a7005 425 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 426 if (!newpsl) {
427 err = -ENOBUFS;
428 goto done;
429 }
430 newpsl->sl_max = count;
431 newpsl->sl_count = count - IP6_SFBLOCK;
432 if (psl) {
433 for (i=0; i<psl->sl_count; i++)
434 newpsl->sl_addr[i] = psl->sl_addr[i];
435 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
436 }
437 pmc->sflist = psl = newpsl;
438 }
439 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
440 for (i=0; i<psl->sl_count; i++) {
07c2fecc 441 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
56db1c5f
JS		 442 if (rv == 0) /* There is an error in the address. */
443 goto done;
1da177e4 444 }
1da177e4
LT		 445 for (j=psl->sl_count-1; j>=i; j--)
446 psl->sl_addr[j+1] = psl->sl_addr[j];
447 psl->sl_addr[i] = *source;
448 psl->sl_count++;
449 err = 0;
450 /* update the interface list */
451 ip6_mc_add_src(idev, group, omode, 1, source, 1);
452done:
5ab4a6c8 453 if (pmclocked)
96b52e61 454 write_unlock(&pmc->sflock);
1da177e4 455 read_unlock_bh(&idev->lock);
96b52e61 456 rcu_read_unlock();
c9e3e8b6
DS		 457 if (leavegroup)
458 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 459 return err;
460}
461
462int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
463{
b71d1d42 464 const struct in6_addr *group;
1da177e4 465 struct ipv6_mc_socklist *pmc;
1da177e4
LT		 466 struct inet6_dev *idev;
467 struct ipv6_pinfo *inet6 = inet6_sk(sk);
468 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 469 struct net *net = sock_net(sk);
9951f036 470 int leavegroup = 0;
1da177e4
LT		 471 int i, err;
472
473 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
474
475 if (!ipv6_addr_is_multicast(group))
476 return -EINVAL;
477 if (gsf->gf_fmode != MCAST_INCLUDE &&
478 gsf->gf_fmode != MCAST_EXCLUDE)
479 return -EINVAL;
480
96b52e61
ED		 481 rcu_read_lock();
482 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 483
96b52e61
ED		 484 if (!idev) {
485 rcu_read_unlock();
1da177e4 486 return -ENODEV;
96b52e61 487 }
1da177e4 488
9c05989b 489 err = 0;
5ab4a6c8 490
9951f036
DS		 491 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
492 leavegroup = 1;
493 goto done;
494 }
495
456b61bc 496 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 497 if (pmc->ifindex != gsf->gf_interface)
498 continue;
499 if (ipv6_addr_equal(&pmc->addr, group))
500 break;
501 }
917f2f10
DS		 502 if (!pmc) { /* must have a prior join */
503 err = -EINVAL;
1da177e4 504 goto done;
917f2f10 505 }
1da177e4 506 if (gsf->gf_numsrc) {
8b3a7005
KK		 507 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
508 GFP_ATOMIC);
1da177e4
LT		 509 if (!newpsl) {
510 err = -ENOBUFS;
511 goto done;
512 }
513 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
514 for (i=0; i<newpsl->sl_count; ++i) {
515 struct sockaddr_in6 *psin6;
516
517 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
518 newpsl->sl_addr[i] = psin6->sin6_addr;
519 }
520 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
521 newpsl->sl_count, newpsl->sl_addr, 0);
522 if (err) {
523 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
524 goto done;
525 }
8713dbf0 526 } else {
1da177e4 527 newpsl = NULL;
8713dbf0
YZ		 528 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
529 }
5ab4a6c8 530
96b52e61 531 write_lock(&pmc->sflock);
1da177e4
LT		 532 psl = pmc->sflist;
533 if (psl) {
534 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
535 psl->sl_count, psl->sl_addr, 0);
536 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
537 } else
538 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
539 pmc->sflist = newpsl;
540 pmc->sfmode = gsf->gf_fmode;
96b52e61 541 write_unlock(&pmc->sflock);
917f2f10 542 err = 0;
1da177e4
LT		 543done:
544 read_unlock_bh(&idev->lock);
96b52e61 545 rcu_read_unlock();
9951f036
DS		 546 if (leavegroup)
547 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 548 return err;
549}
550
551int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
552 struct group_filter __user *optval, int __user *optlen)
553{
554 int err, i, count, copycount;
b71d1d42 555 const struct in6_addr *group;
1da177e4
LT		 556 struct ipv6_mc_socklist *pmc;
557 struct inet6_dev *idev;
1da177e4
LT		 558 struct ipv6_pinfo *inet6 = inet6_sk(sk);
559 struct ip6_sf_socklist *psl;
3b1e0a65 560 struct net *net = sock_net(sk);
1da177e4
LT		 561
562 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
563
564 if (!ipv6_addr_is_multicast(group))
565 return -EINVAL;
566
96b52e61
ED		 567 rcu_read_lock();
568 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
1da177e4 569
96b52e61
ED		 570 if (!idev) {
571 rcu_read_unlock();
1da177e4 572 return -ENODEV;
96b52e61 573 }
1da177e4
LT		 574
575 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 576 /*
577 * changes to the ipv6_mc_list require the socket lock and
578 * a read lock on ip6_sk_mc_lock. We have the socket lock,
579 * so reading the list is safe.
580 */
1da177e4 581
456b61bc 582 for_each_pmc_rcu(inet6, pmc) {
1da177e4
LT		 583 if (pmc->ifindex != gsf->gf_interface)
584 continue;
585 if (ipv6_addr_equal(group, &pmc->addr))
586 break;
587 }
588 if (!pmc) /* must have a prior join */
589 goto done;
590 gsf->gf_fmode = pmc->sfmode;
591 psl = pmc->sflist;
592 count = psl ? psl->sl_count : 0;
593 read_unlock_bh(&idev->lock);
96b52e61 594 rcu_read_unlock();
1da177e4
LT		 595
596 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
597 gsf->gf_numsrc = count;
598 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
599 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
600 return -EFAULT;
601 }
5ab4a6c8
DS		 602 /* changes to psl require the socket lock, a read lock on
603 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
604 * have the socket lock, so reading here is safe.
605 */
1da177e4
LT		 606 for (i=0; i<copycount; i++) {
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();
a50feda5 639 return true;
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
648 for (i=0; i<psl->sl_count; i++) {
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
663static void ma_put(struct ifmcaddr6 *mc)
664{
665 if (atomic_dec_and_test(&mc->mca_refcnt)) {
666 in6_dev_put(mc->idev);
667 kfree(mc);
668 }
669}
670
671static void igmp6_group_added(struct ifmcaddr6 *mc)
672{
673 struct net_device *dev = mc->idev->dev;
674 char buf[MAX_ADDR_LEN];
675
ec16ef22
YH		 676 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
677 IPV6_ADDR_SCOPE_LINKLOCAL)
678 return;
679
1da177e4
LT		 680 spin_lock_bh(&mc->mca_lock);
681 if (!(mc->mca_flags&MAF_LOADED)) {
682 mc->mca_flags |= MAF_LOADED;
683 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 684 dev_mc_add(dev, buf);
1da177e4
LT		 685 }
686 spin_unlock_bh(&mc->mca_lock);
687
688 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
689 return;
690
691 if (MLD_V1_SEEN(mc->idev)) {
692 igmp6_join_group(mc);
693 return;
694 }
695 /* else v2 */
696
697 mc->mca_crcount = mc->idev->mc_qrv;
698 mld_ifc_event(mc->idev);
699}
700
701static void igmp6_group_dropped(struct ifmcaddr6 *mc)
702{
703 struct net_device *dev = mc->idev->dev;
704 char buf[MAX_ADDR_LEN];
705
ec16ef22
YH		 706 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
707 IPV6_ADDR_SCOPE_LINKLOCAL)
708 return;
709
1da177e4
LT		 710 spin_lock_bh(&mc->mca_lock);
711 if (mc->mca_flags&MAF_LOADED) {
712 mc->mca_flags &= ~MAF_LOADED;
713 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 714 dev_mc_del(dev, buf);
1da177e4
LT		 715 }
716
717 if (mc->mca_flags & MAF_NOREPORT)
718 goto done;
719 spin_unlock_bh(&mc->mca_lock);
720
721 if (!mc->idev->dead)
722 igmp6_leave_group(mc);
723
724 spin_lock_bh(&mc->mca_lock);
725 if (del_timer(&mc->mca_timer))
726 atomic_dec(&mc->mca_refcnt);
727done:
728 ip6_mc_clear_src(mc);
729 spin_unlock_bh(&mc->mca_lock);
730}
731
732/*
733 * deleted ifmcaddr6 manipulation
734 */
735static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
736{
737 struct ifmcaddr6 *pmc;
738
739 /* this is an "ifmcaddr6" for convenience; only the fields below
740 * are actually used. In particular, the refcnt and users are not
741 * used for management of the delete list. Using the same structure
742 * for deleted items allows change reports to use common code with
743 * non-deleted or query-response MCA's.
744 */
0c600eda 745 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 746 if (!pmc)
747 return;
0c600eda 748
1da177e4
LT		 749 spin_lock_bh(&im->mca_lock);
750 spin_lock_init(&pmc->mca_lock);
751 pmc->idev = im->idev;
752 in6_dev_hold(idev);
753 pmc->mca_addr = im->mca_addr;
754 pmc->mca_crcount = idev->mc_qrv;
755 pmc->mca_sfmode = im->mca_sfmode;
756 if (pmc->mca_sfmode == MCAST_INCLUDE) {
757 struct ip6_sf_list *psf;
758
759 pmc->mca_tomb = im->mca_tomb;
760 pmc->mca_sources = im->mca_sources;
761 im->mca_tomb = im->mca_sources = NULL;
762 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
763 psf->sf_crcount = pmc->mca_crcount;
764 }
765 spin_unlock_bh(&im->mca_lock);
766
6457d26b 767 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 768 pmc->next = idev->mc_tomb;
769 idev->mc_tomb = pmc;
6457d26b 770 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 771}
772
b71d1d42 773static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
1da177e4
LT		 774{
775 struct ifmcaddr6 *pmc, *pmc_prev;
776 struct ip6_sf_list *psf, *psf_next;
777
6457d26b 778 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 779 pmc_prev = NULL;
780 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
781 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
782 break;
783 pmc_prev = pmc;
784 }
785 if (pmc) {
786 if (pmc_prev)
787 pmc_prev->next = pmc->next;
788 else
789 idev->mc_tomb = pmc->next;
790 }
6457d26b
SH		 791 spin_unlock_bh(&idev->mc_lock);
792
1da177e4
LT		 793 if (pmc) {
794 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
795 psf_next = psf->sf_next;
796 kfree(psf);
797 }
798 in6_dev_put(pmc->idev);
799 kfree(pmc);
800 }
801}
802
803static void mld_clear_delrec(struct inet6_dev *idev)
804{
805 struct ifmcaddr6 *pmc, *nextpmc;
806
6457d26b 807 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 808 pmc = idev->mc_tomb;
809 idev->mc_tomb = NULL;
6457d26b 810 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 811
812 for (; pmc; pmc = nextpmc) {
813 nextpmc = pmc->next;
814 ip6_mc_clear_src(pmc);
815 in6_dev_put(pmc->idev);
816 kfree(pmc);
817 }
818
819 /* clear dead sources, too */
820 read_lock_bh(&idev->lock);
821 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
822 struct ip6_sf_list *psf, *psf_next;
823
824 spin_lock_bh(&pmc->mca_lock);
825 psf = pmc->mca_tomb;
826 pmc->mca_tomb = NULL;
827 spin_unlock_bh(&pmc->mca_lock);
828 for (; psf; psf=psf_next) {
829 psf_next = psf->sf_next;
830 kfree(psf);
831 }
832 }
833 read_unlock_bh(&idev->lock);
834}
835
836
837/*
838 * device multicast group inc (add if not found)
839 */
9acd9f3a 840int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 841{
842 struct ifmcaddr6 *mc;
843 struct inet6_dev *idev;
844
96b52e61 845 /* we need to take a reference on idev */
1da177e4
LT		 846 idev = in6_dev_get(dev);
847
848 if (idev == NULL)
849 return -EINVAL;
850
851 write_lock_bh(&idev->lock);
852 if (idev->dead) {
853 write_unlock_bh(&idev->lock);
854 in6_dev_put(idev);
855 return -ENODEV;
856 }
857
858 for (mc = idev->mc_list; mc; mc = mc->next) {
859 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
860 mc->mca_users++;
861 write_unlock_bh(&idev->lock);
862 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
863 NULL, 0);
864 in6_dev_put(idev);
865 return 0;
866 }
867 }
868
869 /*
870 * not found: create a new one.
871 */
872
0c600eda 873 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 874
875 if (mc == NULL) {
876 write_unlock_bh(&idev->lock);
877 in6_dev_put(idev);
878 return -ENOMEM;
879 }
880
b24b8a24 881 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4 882
4e3fd7a0 883 mc->mca_addr = *addr;
96b52e61 884 mc->idev = idev; /* (reference taken) */
1da177e4
LT		 885 mc->mca_users = 1;
886 /* mca_stamp should be updated upon changes */
887 mc->mca_cstamp = mc->mca_tstamp = jiffies;
888 atomic_set(&mc->mca_refcnt, 2);
889 spin_lock_init(&mc->mca_lock);
890
891 /* initial mode is (EX, empty) */
892 mc->mca_sfmode = MCAST_EXCLUDE;
893 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
894
895 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
896 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
897 mc->mca_flags |= MAF_NOREPORT;
898
899 mc->next = idev->mc_list;
900 idev->mc_list = mc;
901 write_unlock_bh(&idev->lock);
902
903 mld_del_delrec(idev, &mc->mca_addr);
904 igmp6_group_added(mc);
905 ma_put(mc);
906 return 0;
907}
908
909/*
910 * device multicast group del
911 */
9acd9f3a 912int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 913{
914 struct ifmcaddr6 *ma, **map;
915
916 write_lock_bh(&idev->lock);
917 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
918 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
919 if (--ma->mca_users == 0) {
920 *map = ma->next;
921 write_unlock_bh(&idev->lock);
922
923 igmp6_group_dropped(ma);
924
925 ma_put(ma);
926 return 0;
927 }
928 write_unlock_bh(&idev->lock);
929 return 0;
930 }
931 }
932 write_unlock_bh(&idev->lock);
933
934 return -ENOENT;
935}
936
9acd9f3a 937int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4 938{
96b52e61 939 struct inet6_dev *idev;
1da177e4
LT		 940 int err;
941
96b52e61 942 rcu_read_lock();
1da177e4 943
96b52e61
ED		 944 idev = __in6_dev_get(dev);
945 if (!idev)
946 err = -ENODEV;
947 else
948 err = __ipv6_dev_mc_dec(idev, addr);
1da177e4 949
96b52e61 950 rcu_read_unlock();
1da177e4
LT		 951 return err;
952}
953
1da177e4
LT		 954/*
955 * check if the interface/address pair is valid
956 */
a50feda5
ED		 957bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
958 const struct in6_addr *src_addr)
1da177e4
LT		 959{
960 struct inet6_dev *idev;
961 struct ifmcaddr6 *mc;
a50feda5 962 bool rv = false;
1da177e4 963
96b52e61
ED		 964 rcu_read_lock();
965 idev = __in6_dev_get(dev);
1da177e4
LT		 966 if (idev) {
967 read_lock_bh(&idev->lock);
968 for (mc = idev->mc_list; mc; mc=mc->next) {
969 if (ipv6_addr_equal(&mc->mca_addr, group))
970 break;
971 }
972 if (mc) {
973 if (src_addr && !ipv6_addr_any(src_addr)) {
974 struct ip6_sf_list *psf;
975
976 spin_lock_bh(&mc->mca_lock);
977 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
978 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
979 break;
980 }
981 if (psf)
982 rv = psf->sf_count[MCAST_INCLUDE] ||
983 psf->sf_count[MCAST_EXCLUDE] !=
984 mc->mca_sfcount[MCAST_EXCLUDE];
985 else
986 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
987 spin_unlock_bh(&mc->mca_lock);
988 } else
a50feda5 989 rv = true; /* don't filter unspecified source */
1da177e4
LT		 990 }
991 read_unlock_bh(&idev->lock);
1da177e4 992 }
96b52e61 993 rcu_read_unlock();
1da177e4
LT		 994 return rv;
995}
996
997static void mld_gq_start_timer(struct inet6_dev *idev)
998{
999 int tv = net_random() % idev->mc_maxdelay;
1000
1001 idev->mc_gq_running = 1;
1002 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1003 in6_dev_hold(idev);
1004}
1005
1006static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1007{
1008 int tv = net_random() % delay;
1009
1010 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1011 in6_dev_hold(idev);
1012}
1013
b173ee48
HFS		 1014static void mld_dad_start_timer(struct inet6_dev *idev, int delay)
1015{
1016 int tv = net_random() % delay;
1017
1018 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1019 in6_dev_hold(idev);
1020}
1021
1da177e4
LT		 1022/*
1023 * IGMP handling (alias multicast ICMPv6 messages)
1024 */
1025
1026static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1027{
1028 unsigned long delay = resptime;
1029
1030 /* Do not start timer for these addresses */
1031 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1032 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1033 return;
1034
1035 if (del_timer(&ma->mca_timer)) {
1036 atomic_dec(&ma->mca_refcnt);
1037 delay = ma->mca_timer.expires - jiffies;
1038 }
1039
1040 if (delay >= resptime) {
1041 if (resptime)
1042 delay = net_random() % resptime;
1043 else
1044 delay = 1;
1045 }
1046 ma->mca_timer.expires = jiffies + delay;
1047 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1048 atomic_inc(&ma->mca_refcnt);
1049 ma->mca_flags |= MAF_TIMER_RUNNING;
1050}
1051
5ab4a6c8 1052/* mark EXCLUDE-mode sources */
a50feda5
ED		 1053static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1054 const struct in6_addr *srcs)
1da177e4
LT		 1055{
1056 struct ip6_sf_list *psf;
1057 int i, scount;
1058
1059 scount = 0;
1060 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1061 if (scount == nsrcs)
1062 break;
5ab4a6c8
DS		 1063 for (i=0; i<nsrcs; i++) {
1064 /* skip inactive filters */
e05c4ad3 1065 if (psf->sf_count[MCAST_INCLUDE] ||
5ab4a6c8
DS		 1066 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1067 psf->sf_count[MCAST_EXCLUDE])
ce713ee5 1068 break;
5ab4a6c8
DS		 1069 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1070 scount++;
1071 break;
1072 }
1073 }
1074 }
1075 pmc->mca_flags &= ~MAF_GSQUERY;
1076 if (scount == nsrcs) /* all sources excluded */
a50feda5
ED		 1077 return false;
1078 return true;
5ab4a6c8
DS		 1079}
1080
a50feda5
ED		 1081static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1082 const struct in6_addr *srcs)
5ab4a6c8
DS		 1083{
1084 struct ip6_sf_list *psf;
1085 int i, scount;
1086
1087 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1088 return mld_xmarksources(pmc, nsrcs, srcs);
1089
1090 /* mark INCLUDE-mode sources */
1091
1092 scount = 0;
1093 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1094 if (scount == nsrcs)
1095 break;
1096 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1097 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1098 psf->sf_gsresp = 1;
1099 scount++;
1100 break;
1101 }
5ab4a6c8
DS		 1102 }
1103 }
1104 if (!scount) {
1105 pmc->mca_flags &= ~MAF_GSQUERY;
a50feda5 1106 return false;
1da177e4 1107 }
5ab4a6c8 1108 pmc->mca_flags |= MAF_GSQUERY;
a50feda5 1109 return true;
1da177e4
LT		 1110}
1111
96b52e61 1112/* called with rcu_read_lock() */
1da177e4
LT		 1113int igmp6_event_query(struct sk_buff *skb)
1114{
97300b5f 1115 struct mld2_query *mlh2 = NULL;
1da177e4 1116 struct ifmcaddr6 *ma;
b71d1d42 1117 const struct in6_addr *group;
1da177e4
LT		 1118 unsigned long max_delay;
1119 struct inet6_dev *idev;
6e7cb837 1120 struct mld_msg *mld;
1da177e4
LT		 1121 int group_type;
1122 int mark = 0;
1123 int len;
1124
1125 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1126 return -EINVAL;
1127
1128 /* compute payload length excluding extension headers */
0660e03f 1129 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1130 len -= skb_network_header_len(skb);
1da177e4
LT		 1131
1132 /* Drop queries with not link local source */
0660e03f 1133 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1134 return -EINVAL;
1135
96b52e61 1136 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1137
1138 if (idev == NULL)
1139 return 0;
1140
6e7cb837
YH		 1141 mld = (struct mld_msg *)icmp6_hdr(skb);
1142 group = &mld->mld_mca;
1da177e4
LT		 1143 group_type = ipv6_addr_type(group);
1144
1145 if (group_type != IPV6_ADDR_ANY &&
96b52e61 1146 !(group_type&IPV6_ADDR_MULTICAST))
1da177e4 1147 return -EINVAL;
1da177e4
LT		 1148
1149 if (len == 24) {
1150 int switchback;
1151 /* MLDv1 router present */
1152
84698963 1153 max_delay = msecs_to_jiffies(ntohs(mld->mld_maxdelay));
1da177e4
LT		 1154 switchback = (idev->mc_qrv + 1) * max_delay;
1155 idev->mc_v1_seen = jiffies + switchback;
1156
1157 /* cancel the interface change timer */
1158 idev->mc_ifc_count = 0;
1159 if (del_timer(&idev->mc_ifc_timer))
1160 __in6_dev_put(idev);
1161 /* clear deleted report items */
1162 mld_clear_delrec(idev);
1163 } else if (len >= 28) {
1ab1457c 1164 int srcs_offset = sizeof(struct mld2_query) -
97300b5f 1165 sizeof(struct icmp6hdr);
96b52e61 1166 if (!pskb_may_pull(skb, srcs_offset))
97300b5f 1167 return -EINVAL;
96b52e61 1168
9c70220b 1169 mlh2 = (struct mld2_query *)skb_transport_header(skb);
84698963
DB		 1170
1171 max_delay = max(msecs_to_jiffies(MLDV2_MRC(ntohs(mlh2->mld2q_mrc))), 1UL);
1172
1da177e4 1173 idev->mc_maxdelay = max_delay;
84698963 1174
6e7cb837
YH		 1175 if (mlh2->mld2q_qrv)
1176 idev->mc_qrv = mlh2->mld2q_qrv;
1da177e4 1177 if (group_type == IPV6_ADDR_ANY) { /* general query */
96b52e61 1178 if (mlh2->mld2q_nsrcs)
1da177e4 1179 return -EINVAL; /* no sources allowed */
96b52e61 1180
1da177e4 1181 mld_gq_start_timer(idev);
1da177e4
LT		 1182 return 0;
1183 }
1184 /* mark sources to include, if group & source-specific */
6e7cb837 1185 if (mlh2->mld2q_nsrcs != 0) {
1ab1457c 1186 if (!pskb_may_pull(skb, srcs_offset +
96b52e61 1187 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
97300b5f 1188 return -EINVAL;
96b52e61 1189
9c70220b 1190 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1191 mark = 1;
1192 }
96b52e61 1193 } else
1da177e4 1194 return -EINVAL;
1da177e4
LT		 1195
1196 read_lock_bh(&idev->lock);
1197 if (group_type == IPV6_ADDR_ANY) {
1198 for (ma = idev->mc_list; ma; ma=ma->next) {
1199 spin_lock_bh(&ma->mca_lock);
1200 igmp6_group_queried(ma, max_delay);
1201 spin_unlock_bh(&ma->mca_lock);
1202 }
1203 } else {
1204 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1205 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1206 continue;
1207 spin_lock_bh(&ma->mca_lock);
1208 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1209 /* gsquery <- gsquery && mark */
1210 if (!mark)
1211 ma->mca_flags &= ~MAF_GSQUERY;
1212 } else {
1213 /* gsquery <- mark */
1214 if (mark)
1215 ma->mca_flags |= MAF_GSQUERY;
1216 else
1217 ma->mca_flags &= ~MAF_GSQUERY;
1218 }
5ab4a6c8 1219 if (!(ma->mca_flags & MAF_GSQUERY) ||
6e7cb837 1220 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
5ab4a6c8 1221 igmp6_group_queried(ma, max_delay);
1da177e4 1222 spin_unlock_bh(&ma->mca_lock);
7add2a43 1223 break;
1da177e4
LT		 1224 }
1225 }
1226 read_unlock_bh(&idev->lock);
1da177e4
LT		 1227
1228 return 0;
1229}
1230
96b52e61 1231/* called with rcu_read_lock() */
1da177e4
LT		 1232int igmp6_event_report(struct sk_buff *skb)
1233{
1234 struct ifmcaddr6 *ma;
1da177e4 1235 struct inet6_dev *idev;
6e7cb837 1236 struct mld_msg *mld;
1da177e4
LT		 1237 int addr_type;
1238
1239 /* Our own report looped back. Ignore it. */
1240 if (skb->pkt_type == PACKET_LOOPBACK)
1241 return 0;
1242
24c69275
DS		 1243 /* send our report if the MC router may not have heard this report */
1244 if (skb->pkt_type != PACKET_MULTICAST &&
1245 skb->pkt_type != PACKET_BROADCAST)
1246 return 0;
1247
6e7cb837 1248 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1da177e4
LT		 1249 return -EINVAL;
1250
6e7cb837 1251 mld = (struct mld_msg *)icmp6_hdr(skb);
1da177e4
LT		 1252
1253 /* Drop reports with not link local source */
0660e03f 1254 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1255 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1256 !(addr_type&IPV6_ADDR_LINKLOCAL))
1257 return -EINVAL;
1258
96b52e61 1259 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1260 if (idev == NULL)
1261 return -ENODEV;
1262
1263 /*
1264 * Cancel the timer for this group
1265 */
1266
1267 read_lock_bh(&idev->lock);
1268 for (ma = idev->mc_list; ma; ma=ma->next) {
6e7cb837 1269 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1da177e4
LT		 1270 spin_lock(&ma->mca_lock);
1271 if (del_timer(&ma->mca_timer))
1272 atomic_dec(&ma->mca_refcnt);
1273 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1274 spin_unlock(&ma->mca_lock);
1275 break;
1276 }
1277 }
1278 read_unlock_bh(&idev->lock);
1da177e4
LT		 1279 return 0;
1280}
1281
a50feda5
ED		 1282static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1283 int gdeleted, int sdeleted)
1da177e4
LT		 1284{
1285 switch (type) {
1286 case MLD2_MODE_IS_INCLUDE:
1287 case MLD2_MODE_IS_EXCLUDE:
1288 if (gdeleted || sdeleted)
a50feda5 1289 return false;
5ab4a6c8
DS		 1290 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1291 if (pmc->mca_sfmode == MCAST_INCLUDE)
a50feda5 1292 return true;
5ab4a6c8
DS		 1293 /* don't include if this source is excluded
1294 * in all filters
1295 */
1296 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1297 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1298 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1299 psf->sf_count[MCAST_EXCLUDE];
1300 }
a50feda5 1301 return false;
1da177e4
LT		 1302 case MLD2_CHANGE_TO_INCLUDE:
1303 if (gdeleted || sdeleted)
a50feda5 1304 return false;
1da177e4
LT		 1305 return psf->sf_count[MCAST_INCLUDE] != 0;
1306 case MLD2_CHANGE_TO_EXCLUDE:
1307 if (gdeleted || sdeleted)
a50feda5 1308 return false;
1da177e4
LT		 1309 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1310 psf->sf_count[MCAST_INCLUDE])
a50feda5 1311 return false;
1da177e4
LT		 1312 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1313 psf->sf_count[MCAST_EXCLUDE];
1314 case MLD2_ALLOW_NEW_SOURCES:
1315 if (gdeleted || !psf->sf_crcount)
a50feda5 1316 return false;
1da177e4
LT		 1317 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1318 case MLD2_BLOCK_OLD_SOURCES:
1319 if (pmc->mca_sfmode == MCAST_INCLUDE)
1320 return gdeleted || (psf->sf_crcount && sdeleted);
1321 return psf->sf_crcount && !gdeleted && !sdeleted;
1322 }
a50feda5 1323 return false;
1da177e4
LT		 1324}
1325
1326static int
1327mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1328{
1329 struct ip6_sf_list *psf;
1330 int scount = 0;
1331
1332 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1333 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1334 continue;
1335 scount++;
1336 }
1337 return scount;
1338}
1339
2576f17d
YH		 1340static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1341 struct net_device *dev,
1342 const struct in6_addr *saddr,
1343 const struct in6_addr *daddr,
1344 int proto, int len)
1345{
1346 struct ipv6hdr *hdr;
1347
1348 skb->protocol = htons(ETH_P_IPV6);
1349 skb->dev = dev;
1350
1351 skb_reset_network_header(skb);
1352 skb_put(skb, sizeof(struct ipv6hdr));
1353 hdr = ipv6_hdr(skb);
1354
1355 ip6_flow_hdr(hdr, 0, 0);
1356
1357 hdr->payload_len = htons(len);
1358 hdr->nexthdr = proto;
1359 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1360
1361 hdr->saddr = *saddr;
1362 hdr->daddr = *daddr;
1363}
1364
8965779d 1365static struct sk_buff *mld_newpack(struct inet6_dev *idev, int size)
1da177e4 1366{
8965779d 1367 struct net_device *dev = idev->dev;
c346dca1 1368 struct net *net = dev_net(dev);
b8ad0cbc 1369 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1370 struct sk_buff *skb;
1371 struct mld2_report *pmr;
1372 struct in6_addr addr_buf;
d7aabf22 1373 const struct in6_addr *saddr;
a7ae1992
HX		 1374 int hlen = LL_RESERVED_SPACE(dev);
1375 int tlen = dev->needed_tailroom;
1da177e4
LT		 1376 int err;
1377 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1378 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1379 IPV6_TLV_PADN, 0 };
1380
1381 /* we assume size > sizeof(ra) here */
a7ae1992 1382 size += hlen + tlen;
72e09ad1
ED		 1383 /* limit our allocations to order-0 page */
1384 size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1385 skb = sock_alloc_send_skb(sk, size, 1, &err);
1da177e4 1386
cfcabdcc 1387 if (!skb)
1da177e4
LT		 1388 return NULL;
1389
9d4a0314 1390 skb->priority = TC_PRIO_CONTROL;
a7ae1992 1391 skb_reserve(skb, hlen);
1da177e4 1392
8965779d 1393 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1394 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1395 * use unspecified address as the source address
1da177e4
LT		 1396 * when a valid link-local address is not available.
1397 */
d7aabf22
YH		 1398 saddr = &in6addr_any;
1399 } else
1400 saddr = &addr_buf;
1da177e4 1401
2576f17d 1402 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4
LT		 1403
1404 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1405
27a884dc 1406 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1407 skb_put(skb, sizeof(*pmr));
1408 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837
YH		 1409 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1410 pmr->mld2r_resv1 = 0;
1411 pmr->mld2r_cksum = 0;
1412 pmr->mld2r_resv2 = 0;
1413 pmr->mld2r_ngrec = 0;
1da177e4
LT		 1414 return skb;
1415}
1416
1417static void mld_sendpack(struct sk_buff *skb)
1418{
0660e03f 1419 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1420 struct mld2_report *pmr =
1421 (struct mld2_report *)skb_transport_header(skb);
1da177e4 1422 int payload_len, mldlen;
96b52e61 1423 struct inet6_dev *idev;
c346dca1 1424 struct net *net = dev_net(skb->dev);
1da177e4 1425 int err;
4c9483b2 1426 struct flowi6 fl6;
adf30907 1427 struct dst_entry *dst;
1da177e4 1428
96b52e61
ED		 1429 rcu_read_lock();
1430 idev = __in6_dev_get(skb->dev);
edf391ff
NH		 1431 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1432
29a3cad5
SH		 1433 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1434 sizeof(*pip6);
1435 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1da177e4
LT		 1436 pip6->payload_len = htons(payload_len);
1437
6e7cb837
YH		 1438 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1439 IPPROTO_ICMPV6,
1440 csum_partial(skb_transport_header(skb),
1441 mldlen, 0));
41927178 1442
4c9483b2 1443 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
41927178
YH		 1444 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1445 skb->dev->ifindex);
12fd84f4 1446 dst = icmp6_dst_alloc(skb->dev, &fl6);
41927178 1447
452edd59
DM		 1448 err = 0;
1449 if (IS_ERR(dst)) {
1450 err = PTR_ERR(dst);
1451 dst = NULL;
1452 }
adf30907 1453 skb_dst_set(skb, dst);
41927178
YH		 1454 if (err)
1455 goto err_out;
1456
edf391ff
NH		 1457 payload_len = skb->len;
1458
b2e0b385 1459 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1460 dst_output);
1461out:
1da177e4 1462 if (!err) {
5a57d4c7 1463 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
e41b5368 1464 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1465 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1da177e4 1466 } else
483a47d2 1467 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1468
96b52e61 1469 rcu_read_unlock();
41927178
YH		 1470 return;
1471
1472err_out:
1473 kfree_skb(skb);
1474 goto out;
1da177e4
LT		 1475}
1476
1477static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1478{
fab10fe3 1479 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1480}
1481
1482static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1483 int type, struct mld2_grec **ppgr)
1484{
1485 struct net_device *dev = pmc->idev->dev;
1486 struct mld2_report *pmr;
1487 struct mld2_grec *pgr;
1488
1489 if (!skb)
8965779d 1490 skb = mld_newpack(pmc->idev, dev->mtu);
1da177e4
LT		 1491 if (!skb)
1492 return NULL;
1493 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1494 pgr->grec_type = type;
1495 pgr->grec_auxwords = 0;
1496 pgr->grec_nsrcs = 0;
1497 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1498 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1499 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT		 1500 *ppgr = pgr;
1501 return skb;
1502}
1503
1504#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1505 skb_tailroom(skb)) : 0)
1506
1507static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1508 int type, int gdeleted, int sdeleted)
1509{
8965779d
AW		 1510 struct inet6_dev *idev = pmc->idev;
1511 struct net_device *dev = idev->dev;
1da177e4
LT		 1512 struct mld2_report *pmr;
1513 struct mld2_grec *pgr = NULL;
1514 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1515 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1516
1517 if (pmc->mca_flags & MAF_NOREPORT)
1518 return skb;
1519
1520 isquery = type == MLD2_MODE_IS_INCLUDE ||
1521 type == MLD2_MODE_IS_EXCLUDE;
1522 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1523 type == MLD2_CHANGE_TO_EXCLUDE;
1524
5ab4a6c8
DS		 1525 stotal = scount = 0;
1526
1da177e4
LT		 1527 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1528
5ab4a6c8
DS		 1529 if (!*psf_list)
1530 goto empty_source;
1531
9c70220b 1532 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1533
1534 /* EX and TO_EX get a fresh packet, if needed */
1535 if (truncate) {
6e7cb837 1536 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT		 1537 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1538 if (skb)
1539 mld_sendpack(skb);
8965779d 1540 skb = mld_newpack(idev, dev->mtu);
1da177e4
LT		 1541 }
1542 }
1543 first = 1;
1da177e4
LT		 1544 psf_prev = NULL;
1545 for (psf=*psf_list; psf; psf=psf_next) {
1546 struct in6_addr *psrc;
1547
1548 psf_next = psf->sf_next;
1549
1550 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1551 psf_prev = psf;
1552 continue;
1553 }
1554
1555 /* clear marks on query responses */
1556 if (isquery)
1557 psf->sf_gsresp = 0;
1558
1559 if (AVAILABLE(skb) < sizeof(*psrc) +
1560 first*sizeof(struct mld2_grec)) {
1561 if (truncate && !first)
1562 break; /* truncate these */
1563 if (pgr)
1564 pgr->grec_nsrcs = htons(scount);
1565 if (skb)
1566 mld_sendpack(skb);
8965779d 1567 skb = mld_newpack(idev, dev->mtu);
1da177e4
LT		 1568 first = 1;
1569 scount = 0;
1570 }
1571 if (first) {
1572 skb = add_grhead(skb, pmc, type, &pgr);
1573 first = 0;
1574 }
cc63f70b
AD		 1575 if (!skb)
1576 return NULL;
1da177e4
LT		 1577 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1578 *psrc = psf->sf_addr;
5ab4a6c8 1579 scount++; stotal++;
1da177e4
LT		 1580 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1581 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1582 psf->sf_crcount--;
1583 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1584 if (psf_prev)
1585 psf_prev->sf_next = psf->sf_next;
1586 else
1587 *psf_list = psf->sf_next;
1588 kfree(psf);
1589 continue;
1590 }
1591 }
1592 psf_prev = psf;
1593 }
5ab4a6c8
DS		 1594
1595empty_source:
1596 if (!stotal) {
1597 if (type == MLD2_ALLOW_NEW_SOURCES ||
1598 type == MLD2_BLOCK_OLD_SOURCES)
1599 return skb;
1600 if (pmc->mca_crcount || isquery) {
1601 /* make sure we have room for group header */
1602 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1603 mld_sendpack(skb);
1604 skb = NULL; /* add_grhead will get a new one */
1605 }
1606 skb = add_grhead(skb, pmc, type, &pgr);
1607 }
1608 }
1da177e4
LT		 1609 if (pgr)
1610 pgr->grec_nsrcs = htons(scount);
1611
1612 if (isquery)
1613 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1614 return skb;
1615}
1616
1617static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1618{
1619 struct sk_buff *skb = NULL;
1620 int type;
1621
8965779d 1622 read_lock_bh(&idev->lock);
1da177e4 1623 if (!pmc) {
1da177e4
LT		 1624 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1625 if (pmc->mca_flags & MAF_NOREPORT)
1626 continue;
1627 spin_lock_bh(&pmc->mca_lock);
1628 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1629 type = MLD2_MODE_IS_EXCLUDE;
1630 else
1631 type = MLD2_MODE_IS_INCLUDE;
1632 skb = add_grec(skb, pmc, type, 0, 0);
1633 spin_unlock_bh(&pmc->mca_lock);
1634 }
1da177e4
LT		 1635 } else {
1636 spin_lock_bh(&pmc->mca_lock);
1637 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1638 type = MLD2_MODE_IS_EXCLUDE;
1639 else
1640 type = MLD2_MODE_IS_INCLUDE;
1641 skb = add_grec(skb, pmc, type, 0, 0);
1642 spin_unlock_bh(&pmc->mca_lock);
1643 }
8965779d 1644 read_unlock_bh(&idev->lock);
1da177e4
LT		 1645 if (skb)
1646 mld_sendpack(skb);
1647}
1648
1649/*
1650 * remove zero-count source records from a source filter list
1651 */
1652static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1653{
1654 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1655
1656 psf_prev = NULL;
1657 for (psf=*ppsf; psf; psf = psf_next) {
1658 psf_next = psf->sf_next;
1659 if (psf->sf_crcount == 0) {
1660 if (psf_prev)
1661 psf_prev->sf_next = psf->sf_next;
1662 else
1663 *ppsf = psf->sf_next;
1664 kfree(psf);
1665 } else
1666 psf_prev = psf;
1667 }
1668}
1669
1670static void mld_send_cr(struct inet6_dev *idev)
1671{
1672 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1673 struct sk_buff *skb = NULL;
1674 int type, dtype;
1675
1676 read_lock_bh(&idev->lock);
6457d26b 1677 spin_lock(&idev->mc_lock);
1da177e4
LT		 1678
1679 /* deleted MCA's */
1680 pmc_prev = NULL;
1681 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1682 pmc_next = pmc->next;
1683 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1684 type = MLD2_BLOCK_OLD_SOURCES;
1685 dtype = MLD2_BLOCK_OLD_SOURCES;
1686 skb = add_grec(skb, pmc, type, 1, 0);
1687 skb = add_grec(skb, pmc, dtype, 1, 1);
1688 }
1689 if (pmc->mca_crcount) {
1da177e4
LT		 1690 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1691 type = MLD2_CHANGE_TO_INCLUDE;
1692 skb = add_grec(skb, pmc, type, 1, 0);
1693 }
5ab4a6c8 1694 pmc->mca_crcount--;
1da177e4
LT		 1695 if (pmc->mca_crcount == 0) {
1696 mld_clear_zeros(&pmc->mca_tomb);
1697 mld_clear_zeros(&pmc->mca_sources);
1698 }
1699 }
1700 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1701 !pmc->mca_sources) {
1702 if (pmc_prev)
1703 pmc_prev->next = pmc_next;
1704 else
1705 idev->mc_tomb = pmc_next;
1706 in6_dev_put(pmc->idev);
1707 kfree(pmc);
1708 } else
1709 pmc_prev = pmc;
1710 }
6457d26b 1711 spin_unlock(&idev->mc_lock);
1da177e4
LT		 1712
1713 /* change recs */
1714 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1715 spin_lock_bh(&pmc->mca_lock);
1716 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1717 type = MLD2_BLOCK_OLD_SOURCES;
1718 dtype = MLD2_ALLOW_NEW_SOURCES;
1719 } else {
1720 type = MLD2_ALLOW_NEW_SOURCES;
1721 dtype = MLD2_BLOCK_OLD_SOURCES;
1722 }
1723 skb = add_grec(skb, pmc, type, 0, 0);
1724 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1725
1726 /* filter mode changes */
1727 if (pmc->mca_crcount) {
1da177e4
LT		 1728 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1729 type = MLD2_CHANGE_TO_EXCLUDE;
1730 else
1731 type = MLD2_CHANGE_TO_INCLUDE;
1732 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1733 pmc->mca_crcount--;
1da177e4
LT		 1734 }
1735 spin_unlock_bh(&pmc->mca_lock);
1736 }
1737 read_unlock_bh(&idev->lock);
1738 if (!skb)
1739 return;
1740 (void) mld_sendpack(skb);
1741}
1742
1743static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1744{
c346dca1 1745 struct net *net = dev_net(dev);
b8ad0cbc 1746 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1747 struct inet6_dev *idev;
1ab1457c 1748 struct sk_buff *skb;
6e7cb837 1749 struct mld_msg *hdr;
d7aabf22 1750 const struct in6_addr *snd_addr, *saddr;
1da177e4 1751 struct in6_addr addr_buf;
a7ae1992
HX		 1752 int hlen = LL_RESERVED_SPACE(dev);
1753 int tlen = dev->needed_tailroom;
1da177e4
LT		 1754 int err, len, payload_len, full_len;
1755 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1756 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1757 IPV6_TLV_PADN, 0 };
4c9483b2 1758 struct flowi6 fl6;
adf30907 1759 struct dst_entry *dst;
1da177e4 1760
f3ee4010
YH		 1761 if (type == ICMPV6_MGM_REDUCTION)
1762 snd_addr = &in6addr_linklocal_allrouters;
1763 else
1764 snd_addr = addr;
1da177e4
LT		 1765
1766 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1767 payload_len = len + sizeof(ra);
1768 full_len = sizeof(struct ipv6hdr) + payload_len;
1769
edf391ff
NH		 1770 rcu_read_lock();
1771 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1772 IPSTATS_MIB_OUT, full_len);
1773 rcu_read_unlock();
1774
a7ae1992 1775 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1da177e4
LT		 1776
1777 if (skb == NULL) {
a11d206d 1778 rcu_read_lock();
3bd653c8 1779 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 1780 IPSTATS_MIB_OUTDISCARDS);
1781 rcu_read_unlock();
1da177e4
LT		 1782 return;
1783 }
9d4a0314 1784 skb->priority = TC_PRIO_CONTROL;
a7ae1992 1785 skb_reserve(skb, hlen);
1da177e4 1786
95c385b4 1787 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1788 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1789 * use unspecified address as the source address
1da177e4
LT		 1790 * when a valid link-local address is not available.
1791 */
d7aabf22
YH		 1792 saddr = &in6addr_any;
1793 } else
1794 saddr = &addr_buf;
1da177e4 1795
2576f17d 1796 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT		 1797
1798 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1799
6e7cb837
YH		 1800 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1801 memset(hdr, 0, sizeof(struct mld_msg));
1802 hdr->mld_type = type;
4e3fd7a0 1803 hdr->mld_mca = *addr;
1da177e4 1804
6e7cb837
YH		 1805 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1806 IPPROTO_ICMPV6,
1807 csum_partial(hdr, len, 0));
1da177e4 1808
96b52e61
ED		 1809 rcu_read_lock();
1810 idev = __in6_dev_get(skb->dev);
1da177e4 1811
4c9483b2 1812 icmpv6_flow_init(sk, &fl6, type,
41927178
YH		 1813 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1814 skb->dev->ifindex);
12fd84f4 1815 dst = icmp6_dst_alloc(skb->dev, &fl6);
452edd59
DM		 1816 if (IS_ERR(dst)) {
1817 err = PTR_ERR(dst);
41927178 1818 goto err_out;
452edd59 1819 }
41927178 1820
adf30907 1821 skb_dst_set(skb, dst);
b2e0b385 1822 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1823 dst_output);
1824out:
1da177e4 1825 if (!err) {
5c5d244b 1826 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 1827 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1828 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1da177e4 1829 } else
3bd653c8 1830 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4 1831
96b52e61 1832 rcu_read_unlock();
1da177e4 1833 return;
41927178
YH		 1834
1835err_out:
1836 kfree_skb(skb);
1837 goto out;
1da177e4
LT		 1838}
1839
b173ee48
HFS		 1840static void mld_resend_report(struct inet6_dev *idev)
1841{
1842 if (MLD_V1_SEEN(idev)) {
1843 struct ifmcaddr6 *mcaddr;
1844 read_lock_bh(&idev->lock);
1845 for (mcaddr = idev->mc_list; mcaddr; mcaddr = mcaddr->next) {
1846 if (!(mcaddr->mca_flags & MAF_NOREPORT))
1847 igmp6_send(&mcaddr->mca_addr, idev->dev,
1848 ICMPV6_MGM_REPORT);
1849 }
1850 read_unlock_bh(&idev->lock);
1851 } else {
1852 mld_send_report(idev, NULL);
1853 }
1854}
1855
1856void ipv6_mc_dad_complete(struct inet6_dev *idev)
1857{
1858 idev->mc_dad_count = idev->mc_qrv;
1859 if (idev->mc_dad_count) {
1860 mld_resend_report(idev);
1861 idev->mc_dad_count--;
1862 if (idev->mc_dad_count)
1863 mld_dad_start_timer(idev, idev->mc_maxdelay);
1864 }
1865}
1866
1867static void mld_dad_timer_expire(unsigned long data)
1868{
1869 struct inet6_dev *idev = (struct inet6_dev *)data;
1870
1871 mld_resend_report(idev);
1872 if (idev->mc_dad_count) {
1873 idev->mc_dad_count--;
1874 if (idev->mc_dad_count)
1875 mld_dad_start_timer(idev, idev->mc_maxdelay);
1876 }
1877 __in6_dev_put(idev);
1878}
1879
1da177e4 1880static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
b71d1d42 1881 const struct in6_addr *psfsrc)
1da177e4
LT		 1882{
1883 struct ip6_sf_list *psf, *psf_prev;
1884 int rv = 0;
1885
1886 psf_prev = NULL;
1887 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1888 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1889 break;
1890 psf_prev = psf;
1891 }
1892 if (!psf || psf->sf_count[sfmode] == 0) {
1893 /* source filter not found, or count wrong => bug */
1894 return -ESRCH;
1895 }
1896 psf->sf_count[sfmode]--;
1897 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1898 struct inet6_dev *idev = pmc->idev;
1899
1900 /* no more filters for this source */
1901 if (psf_prev)
1902 psf_prev->sf_next = psf->sf_next;
1903 else
1904 pmc->mca_sources = psf->sf_next;
1905 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1906 !MLD_V1_SEEN(idev)) {
1907 psf->sf_crcount = idev->mc_qrv;
1908 psf->sf_next = pmc->mca_tomb;
1909 pmc->mca_tomb = psf;
1910 rv = 1;
1911 } else
1912 kfree(psf);
1913 }
1914 return rv;
1915}
1916
b71d1d42
ED		 1917static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1918 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 1919 int delta)
1920{
1921 struct ifmcaddr6 *pmc;
1922 int changerec = 0;
1923 int i, err;
1924
1925 if (!idev)
1926 return -ENODEV;
1927 read_lock_bh(&idev->lock);
1928 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1929 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1930 break;
1931 }
1932 if (!pmc) {
1933 /* MCA not found?? bug */
1934 read_unlock_bh(&idev->lock);
1935 return -ESRCH;
1936 }
1937 spin_lock_bh(&pmc->mca_lock);
1938 sf_markstate(pmc);
1939 if (!delta) {
1940 if (!pmc->mca_sfcount[sfmode]) {
1941 spin_unlock_bh(&pmc->mca_lock);
1942 read_unlock_bh(&idev->lock);
1943 return -EINVAL;
1944 }
1945 pmc->mca_sfcount[sfmode]--;
1946 }
1947 err = 0;
1948 for (i=0; i<sfcount; i++) {
1949 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1950
1951 changerec |= rv > 0;
1952 if (!err && rv < 0)
1953 err = rv;
1954 }
1955 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1956 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1957 pmc->mca_sfcount[MCAST_INCLUDE]) {
1958 struct ip6_sf_list *psf;
1959
1960 /* filter mode change */
1961 pmc->mca_sfmode = MCAST_INCLUDE;
1962 pmc->mca_crcount = idev->mc_qrv;
1963 idev->mc_ifc_count = pmc->mca_crcount;
1964 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1965 psf->sf_crcount = 0;
1966 mld_ifc_event(pmc->idev);
1967 } else if (sf_setstate(pmc) || changerec)
1968 mld_ifc_event(pmc->idev);
1969 spin_unlock_bh(&pmc->mca_lock);
1970 read_unlock_bh(&idev->lock);
1971 return err;
1972}
1973
1974/*
1975 * Add multicast single-source filter to the interface list
1976 */
1977static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
99d2f47a 1978 const struct in6_addr *psfsrc)
1da177e4
LT		 1979{
1980 struct ip6_sf_list *psf, *psf_prev;
1981
1982 psf_prev = NULL;
1983 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1984 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1985 break;
1986 psf_prev = psf;
1987 }
1988 if (!psf) {
0c600eda 1989 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1990 if (!psf)
1991 return -ENOBUFS;
0c600eda 1992
1da177e4
LT		 1993 psf->sf_addr = *psfsrc;
1994 if (psf_prev) {
1995 psf_prev->sf_next = psf;
1996 } else
1997 pmc->mca_sources = psf;
1998 }
1999 psf->sf_count[sfmode]++;
2000 return 0;
2001}
2002
2003static void sf_markstate(struct ifmcaddr6 *pmc)
2004{
2005 struct ip6_sf_list *psf;
2006 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2007
2008 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
2009 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2010 psf->sf_oldin = mca_xcount ==
2011 psf->sf_count[MCAST_EXCLUDE] &&
2012 !psf->sf_count[MCAST_INCLUDE];
2013 } else
2014 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2015}
2016
2017static int sf_setstate(struct ifmcaddr6 *pmc)
2018{
7add2a43 2019 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2020 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2021 int qrv = pmc->idev->mc_qrv;
2022 int new_in, rv;
2023
2024 rv = 0;
2025 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2026 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2027 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2028 !psf->sf_count[MCAST_INCLUDE];
2029 } else
2030 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2031 if (new_in) {
2032 if (!psf->sf_oldin) {
e80e28b6 2033 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 2034
2035 for (dpsf=pmc->mca_tomb; dpsf;
2036 dpsf=dpsf->sf_next) {
2037 if (ipv6_addr_equal(&dpsf->sf_addr,
2038 &psf->sf_addr))
2039 break;
2040 prev = dpsf;
2041 }
2042 if (dpsf) {
2043 if (prev)
2044 prev->sf_next = dpsf->sf_next;
2045 else
2046 pmc->mca_tomb = dpsf->sf_next;
2047 kfree(dpsf);
2048 }
2049 psf->sf_crcount = qrv;
2050 rv++;
2051 }
2052 } else if (psf->sf_oldin) {
2053 psf->sf_crcount = 0;
2054 /*
2055 * add or update "delete" records if an active filter
2056 * is now inactive
2057 */
2058 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2059 if (ipv6_addr_equal(&dpsf->sf_addr,
2060 &psf->sf_addr))
2061 break;
2062 if (!dpsf) {
5d55354f 2063 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
7add2a43
DS		 2064 if (!dpsf)
2065 continue;
2066 *dpsf = *psf;
2067 /* pmc->mca_lock held by callers */
2068 dpsf->sf_next = pmc->mca_tomb;
2069 pmc->mca_tomb = dpsf;
2070 }
2071 dpsf->sf_crcount = qrv;
1da177e4
LT		 2072 rv++;
2073 }
2074 }
2075 return rv;
2076}
2077
2078/*
2079 * Add multicast source filter list to the interface list
2080 */
b71d1d42
ED		 2081static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2082 int sfmode, int sfcount, const struct in6_addr *psfsrc,
1da177e4
LT		 2083 int delta)
2084{
2085 struct ifmcaddr6 *pmc;
2086 int isexclude;
2087 int i, err;
2088
2089 if (!idev)
2090 return -ENODEV;
2091 read_lock_bh(&idev->lock);
2092 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2093 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2094 break;
2095 }
2096 if (!pmc) {
2097 /* MCA not found?? bug */
2098 read_unlock_bh(&idev->lock);
2099 return -ESRCH;
2100 }
2101 spin_lock_bh(&pmc->mca_lock);
2102
2103 sf_markstate(pmc);
2104 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2105 if (!delta)
2106 pmc->mca_sfcount[sfmode]++;
2107 err = 0;
2108 for (i=0; i<sfcount; i++) {
99d2f47a 2109 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1da177e4
LT		 2110 if (err)
2111 break;
2112 }
2113 if (err) {
2114 int j;
2115
2116 if (!delta)
2117 pmc->mca_sfcount[sfmode]--;
2118 for (j=0; j<i; j++)
78d50217 2119 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1da177e4 2120 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2121 struct ip6_sf_list *psf;
2122
2123 /* filter mode change */
2124 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2125 pmc->mca_sfmode = MCAST_EXCLUDE;
2126 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2127 pmc->mca_sfmode = MCAST_INCLUDE;
2128 /* else no filters; keep old mode for reports */
2129
2130 pmc->mca_crcount = idev->mc_qrv;
2131 idev->mc_ifc_count = pmc->mca_crcount;
2132 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2133 psf->sf_crcount = 0;
2134 mld_ifc_event(idev);
2135 } else if (sf_setstate(pmc))
2136 mld_ifc_event(idev);
2137 spin_unlock_bh(&pmc->mca_lock);
2138 read_unlock_bh(&idev->lock);
2139 return err;
2140}
2141
2142static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2143{
2144 struct ip6_sf_list *psf, *nextpsf;
2145
2146 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2147 nextpsf = psf->sf_next;
2148 kfree(psf);
2149 }
2150 pmc->mca_tomb = NULL;
2151 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2152 nextpsf = psf->sf_next;
2153 kfree(psf);
2154 }
2155 pmc->mca_sources = NULL;
2156 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2157 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2158 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2159}
2160
2161
2162static void igmp6_join_group(struct ifmcaddr6 *ma)
2163{
2164 unsigned long delay;
2165
2166 if (ma->mca_flags & MAF_NOREPORT)
2167 return;
2168
2169 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2170
fc4eba58 2171 delay = net_random() % unsolicited_report_interval(ma->idev);
1da177e4
LT		 2172
2173 spin_lock_bh(&ma->mca_lock);
2174 if (del_timer(&ma->mca_timer)) {
2175 atomic_dec(&ma->mca_refcnt);
2176 delay = ma->mca_timer.expires - jiffies;
2177 }
2178
2179 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2180 atomic_inc(&ma->mca_refcnt);
2181 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2182 spin_unlock_bh(&ma->mca_lock);
2183}
2184
2185static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2186 struct inet6_dev *idev)
2187{
2188 int err;
2189
5ab4a6c8
DS		 2190 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2191 * so no other readers or writers of iml or its sflist
2192 */
cfcabdcc 2193 if (!iml->sflist) {
1da177e4
LT		 2194 /* any-source empty exclude case */
2195 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2196 }
2197 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2198 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2199 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2200 iml->sflist = NULL;
2201 return err;
2202}
2203
2204static void igmp6_leave_group(struct ifmcaddr6 *ma)
2205{
2206 if (MLD_V1_SEEN(ma->idev)) {
2207 if (ma->mca_flags & MAF_LAST_REPORTER)
2208 igmp6_send(&ma->mca_addr, ma->idev->dev,
2209 ICMPV6_MGM_REDUCTION);
2210 } else {
2211 mld_add_delrec(ma->idev, ma);
2212 mld_ifc_event(ma->idev);
2213 }
2214}
2215
2216static void mld_gq_timer_expire(unsigned long data)
2217{
2218 struct inet6_dev *idev = (struct inet6_dev *)data;
2219
2220 idev->mc_gq_running = 0;
2221 mld_send_report(idev, NULL);
2222 __in6_dev_put(idev);
2223}
2224
2225static void mld_ifc_timer_expire(unsigned long data)
2226{
2227 struct inet6_dev *idev = (struct inet6_dev *)data;
2228
2229 mld_send_cr(idev);
2230 if (idev->mc_ifc_count) {
2231 idev->mc_ifc_count--;
2232 if (idev->mc_ifc_count)
2233 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2234 }
2235 __in6_dev_put(idev);
2236}
2237
2238static void mld_ifc_event(struct inet6_dev *idev)
2239{
2240 if (MLD_V1_SEEN(idev))
2241 return;
2242 idev->mc_ifc_count = idev->mc_qrv;
2243 mld_ifc_start_timer(idev, 1);
2244}
2245
2246
2247static void igmp6_timer_handler(unsigned long data)
2248{
2249 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2250
2251 if (MLD_V1_SEEN(ma->idev))
2252 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2253 else
2254 mld_send_report(ma->idev, ma);
2255
2256 spin_lock(&ma->mca_lock);
2257 ma->mca_flags |= MAF_LAST_REPORTER;
2258 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2259 spin_unlock(&ma->mca_lock);
2260 ma_put(ma);
2261}
2262
75c78500
MS		 2263/* Device changing type */
2264
2265void ipv6_mc_unmap(struct inet6_dev *idev)
2266{
2267 struct ifmcaddr6 *i;
2268
2269 /* Install multicast list, except for all-nodes (already installed) */
2270
2271 read_lock_bh(&idev->lock);
2272 for (i = idev->mc_list; i; i = i->next)
2273 igmp6_group_dropped(i);
2274 read_unlock_bh(&idev->lock);
2275}
2276
2277void ipv6_mc_remap(struct inet6_dev *idev)
2278{
2279 ipv6_mc_up(idev);
2280}
2281
1da177e4
LT		 2282/* Device going down */
2283
2284void ipv6_mc_down(struct inet6_dev *idev)
2285{
2286 struct ifmcaddr6 *i;
2287
2288 /* Withdraw multicast list */
2289
2290 read_lock_bh(&idev->lock);
2291 idev->mc_ifc_count = 0;
2292 if (del_timer(&idev->mc_ifc_timer))
2293 __in6_dev_put(idev);
2294 idev->mc_gq_running = 0;
2295 if (del_timer(&idev->mc_gq_timer))
2296 __in6_dev_put(idev);
b173ee48
HFS		 2297 if (del_timer(&idev->mc_dad_timer))
2298 __in6_dev_put(idev);
1da177e4
LT		 2299
2300 for (i = idev->mc_list; i; i=i->next)
2301 igmp6_group_dropped(i);
2302 read_unlock_bh(&idev->lock);
2303
2304 mld_clear_delrec(idev);
2305}
2306
2307
2308/* Device going up */
2309
2310void ipv6_mc_up(struct inet6_dev *idev)
2311{
2312 struct ifmcaddr6 *i;
2313
2314 /* Install multicast list, except for all-nodes (already installed) */
2315
2316 read_lock_bh(&idev->lock);
2317 for (i = idev->mc_list; i; i=i->next)
2318 igmp6_group_added(i);
2319 read_unlock_bh(&idev->lock);
2320}
2321
2322/* IPv6 device initialization. */
2323
2324void ipv6_mc_init_dev(struct inet6_dev *idev)
2325{
1da177e4 2326 write_lock_bh(&idev->lock);
6457d26b 2327 spin_lock_init(&idev->mc_lock);
1da177e4 2328 idev->mc_gq_running = 0;
b24b8a24
PE		 2329 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2330 (unsigned long)idev);
1da177e4
LT		 2331 idev->mc_tomb = NULL;
2332 idev->mc_ifc_count = 0;
b24b8a24
PE		 2333 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2334 (unsigned long)idev);
b173ee48
HFS		 2335 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2336 (unsigned long)idev);
1da177e4 2337 idev->mc_qrv = MLD_QRV_DEFAULT;
fc4eba58 2338 idev->mc_maxdelay = unsolicited_report_interval(idev);
1da177e4
LT		 2339 idev->mc_v1_seen = 0;
2340 write_unlock_bh(&idev->lock);
1da177e4
LT		 2341}
2342
2343/*
2344 * Device is about to be destroyed: clean up.
2345 */
2346
2347void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2348{
2349 struct ifmcaddr6 *i;
1da177e4
LT		 2350
2351 /* Deactivate timers */
2352 ipv6_mc_down(idev);
2353
2354 /* Delete all-nodes address. */
1da177e4
LT		 2355 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2356 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2357 * fail.
2358 */
f3ee4010 2359 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2360
f3ee4010
YH		 2361 if (idev->cnf.forwarding)
2362 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2363
2364 write_lock_bh(&idev->lock);
2365 while ((i = idev->mc_list) != NULL) {
2366 idev->mc_list = i->next;
2367 write_unlock_bh(&idev->lock);
2368
2369 igmp6_group_dropped(i);
2370 ma_put(i);
2371
2372 write_lock_bh(&idev->lock);
2373 }
2374 write_unlock_bh(&idev->lock);
2375}
2376
2377#ifdef CONFIG_PROC_FS
2378struct igmp6_mc_iter_state {
b8ad0cbc 2379 struct seq_net_private p;
1da177e4
LT		 2380 struct net_device *dev;
2381 struct inet6_dev *idev;
2382};
2383
2384#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2385
2386static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2387{
2388 struct ifmcaddr6 *im = NULL;
2389 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2390 struct net *net = seq_file_net(seq);
1da177e4 2391
7562f876 2392 state->idev = NULL;
ce81b76a 2393 for_each_netdev_rcu(net, state->dev) {
1da177e4 2394 struct inet6_dev *idev;
ce81b76a 2395 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2396 if (!idev)
2397 continue;
2398 read_lock_bh(&idev->lock);
2399 im = idev->mc_list;
2400 if (im) {
2401 state->idev = idev;
2402 break;
2403 }
2404 read_unlock_bh(&idev->lock);
1da177e4
LT		 2405 }
2406 return im;
2407}
2408
2409static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2410{
2411 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2412
2413 im = im->next;
2414 while (!im) {
ce81b76a 2415 if (likely(state->idev != NULL))
1da177e4 2416 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2417
2418 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2419 if (!state->dev) {
2420 state->idev = NULL;
2421 break;
2422 }
ce81b76a 2423 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2424 if (!state->idev)
2425 continue;
2426 read_lock_bh(&state->idev->lock);
2427 im = state->idev->mc_list;
2428 }
2429 return im;
2430}
2431
2432static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2433{
2434 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2435 if (im)
2436 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2437 --pos;
2438 return pos ? NULL : im;
2439}
2440
2441static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2442 __acquires(RCU)
1da177e4 2443{
ce81b76a 2444 rcu_read_lock();
1da177e4
LT		 2445 return igmp6_mc_get_idx(seq, *pos);
2446}
2447
2448static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2449{
ce81b76a
ED		 2450 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2451
1da177e4
LT		 2452 ++*pos;
2453 return im;
2454}
2455
2456static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2457 __releases(RCU)
1da177e4
LT		 2458{
2459 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2460
1da177e4
LT		 2461 if (likely(state->idev != NULL)) {
2462 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2463 state->idev = NULL;
2464 }
2465 state->dev = NULL;
ce81b76a 2466 rcu_read_unlock();
1da177e4
LT		 2467}
2468
2469static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2470{
2471 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2472 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2473
2474 seq_printf(seq,
4b7a4274 2475 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2476 state->dev->ifindex, state->dev->name,
b071195d 2477 &im->mca_addr,
1da177e4
LT		 2478 im->mca_users, im->mca_flags,
2479 (im->mca_flags&MAF_TIMER_RUNNING) ?
2480 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2481 return 0;
2482}
2483
56b3d975 2484static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2485 .start = igmp6_mc_seq_start,
2486 .next = igmp6_mc_seq_next,
2487 .stop = igmp6_mc_seq_stop,
2488 .show = igmp6_mc_seq_show,
2489};
2490
2491static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2492{
b8ad0cbc
DL		 2493 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2494 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2495}
2496
9a32144e 2497static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2498 .owner = THIS_MODULE,
2499 .open = igmp6_mc_seq_open,
2500 .read = seq_read,
2501 .llseek = seq_lseek,
b8ad0cbc 2502 .release = seq_release_net,
1da177e4
LT		 2503};
2504
2505struct igmp6_mcf_iter_state {
b8ad0cbc 2506 struct seq_net_private p;
1da177e4
LT		 2507 struct net_device *dev;
2508 struct inet6_dev *idev;
2509 struct ifmcaddr6 *im;
2510};
2511
2512#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2513
2514static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2515{
2516 struct ip6_sf_list *psf = NULL;
2517 struct ifmcaddr6 *im = NULL;
2518 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2519 struct net *net = seq_file_net(seq);
1da177e4 2520
7562f876
PE		 2521 state->idev = NULL;
2522 state->im = NULL;
ce81b76a 2523 for_each_netdev_rcu(net, state->dev) {
1da177e4 2524 struct inet6_dev *idev;
ce81b76a 2525 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2526 if (unlikely(idev == NULL))
2527 continue;
2528 read_lock_bh(&idev->lock);
2529 im = idev->mc_list;
2530 if (likely(im != NULL)) {
2531 spin_lock_bh(&im->mca_lock);
2532 psf = im->mca_sources;
2533 if (likely(psf != NULL)) {
2534 state->im = im;
2535 state->idev = idev;
2536 break;
2537 }
2538 spin_unlock_bh(&im->mca_lock);
2539 }
2540 read_unlock_bh(&idev->lock);
1da177e4
LT		 2541 }
2542 return psf;
2543}
2544
2545static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2546{
2547 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2548
2549 psf = psf->sf_next;
2550 while (!psf) {
2551 spin_unlock_bh(&state->im->mca_lock);
2552 state->im = state->im->next;
2553 while (!state->im) {
ce81b76a 2554 if (likely(state->idev != NULL))
1da177e4 2555 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2556
2557 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2558 if (!state->dev) {
2559 state->idev = NULL;
2560 goto out;
2561 }
ce81b76a 2562 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2563 if (!state->idev)
2564 continue;
2565 read_lock_bh(&state->idev->lock);
2566 state->im = state->idev->mc_list;
2567 }
2568 if (!state->im)
2569 break;
2570 spin_lock_bh(&state->im->mca_lock);
2571 psf = state->im->mca_sources;
2572 }
2573out:
2574 return psf;
2575}
2576
2577static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2578{
2579 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2580 if (psf)
2581 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2582 --pos;
2583 return pos ? NULL : psf;
2584}
2585
2586static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2587 __acquires(RCU)
1da177e4 2588{
ce81b76a 2589 rcu_read_lock();
1da177e4
LT		 2590 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2591}
2592
2593static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2594{
2595 struct ip6_sf_list *psf;
2596 if (v == SEQ_START_TOKEN)
2597 psf = igmp6_mcf_get_first(seq);
2598 else
2599 psf = igmp6_mcf_get_next(seq, v);
2600 ++*pos;
2601 return psf;
2602}
2603
2604static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2605 __releases(RCU)
1da177e4
LT		 2606{
2607 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2608 if (likely(state->im != NULL)) {
2609 spin_unlock_bh(&state->im->mca_lock);
2610 state->im = NULL;
2611 }
2612 if (likely(state->idev != NULL)) {
2613 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2614 state->idev = NULL;
2615 }
2616 state->dev = NULL;
ce81b76a 2617 rcu_read_unlock();
1da177e4
LT		 2618}
2619
2620static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2621{
2622 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2623 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2624
2625 if (v == SEQ_START_TOKEN) {
1ab1457c 2626 seq_printf(seq,
1da177e4 2627 "%3s %6s "
9343e79a 2628 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2629 "Device", "Multicast Address",
2630 "Source Address", "INC", "EXC");
2631 } else {
2632 seq_printf(seq,
4b7a4274 2633 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2634 state->dev->ifindex, state->dev->name,
b071195d
HH		 2635 &state->im->mca_addr,
2636 &psf->sf_addr,
1da177e4
LT		 2637 psf->sf_count[MCAST_INCLUDE],
2638 psf->sf_count[MCAST_EXCLUDE]);
2639 }
2640 return 0;
2641}
2642
56b3d975 2643static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2644 .start = igmp6_mcf_seq_start,
2645 .next = igmp6_mcf_seq_next,
2646 .stop = igmp6_mcf_seq_stop,
2647 .show = igmp6_mcf_seq_show,
2648};
2649
2650static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2651{
b8ad0cbc
DL		 2652 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2653 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2654}
2655
9a32144e 2656static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2657 .owner = THIS_MODULE,
2658 .open = igmp6_mcf_seq_open,
2659 .read = seq_read,
2660 .llseek = seq_lseek,
b8ad0cbc 2661 .release = seq_release_net,
1da177e4 2662};
ea82edf7 2663
2c8c1e72 2664static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 2665{
2666 int err;
2667
2668 err = -ENOMEM;
d4beaa66 2669 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
ea82edf7 2670 goto out;
d4beaa66
G		 2671 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2672 &igmp6_mcf_seq_fops))
ea82edf7
DL		 2673 goto out_proc_net_igmp6;
2674
2675 err = 0;
2676out:
2677 return err;
2678
2679out_proc_net_igmp6:
ece31ffd 2680 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 2681 goto out;
2682}
2683
2c8c1e72 2684static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7 2685{
ece31ffd
G		 2686 remove_proc_entry("mcfilter6", net->proc_net);
2687 remove_proc_entry("igmp6", net->proc_net);
ea82edf7
DL		 2688}
2689#else
2c8c1e72 2690static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 2691{
2692 return 0;
2693}
2c8c1e72 2694static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2695{
ea82edf7 2696}
1da177e4
LT		 2697#endif
2698
2c8c1e72 2699static int __net_init igmp6_net_init(struct net *net)
1da177e4 2700{
1da177e4
LT		 2701 int err;
2702
1ed8516f
DL		 2703 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2704 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4 2705 if (err < 0) {
f3213831 2706 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
1da177e4 2707 err);
b8ad0cbc 2708 goto out;
1da177e4
LT		 2709 }
2710
1ed8516f 2711 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2712
ea82edf7
DL		 2713 err = igmp6_proc_init(net);
2714 if (err)
b8ad0cbc 2715 goto out_sock_create;
b8ad0cbc
DL		 2716out:
2717 return err;
2718
2719out_sock_create:
1ed8516f 2720 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2721 goto out;
1da177e4
LT		 2722}
2723
2c8c1e72 2724static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2725{
1ed8516f 2726 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2727 igmp6_proc_exit(net);
1da177e4 2728}
b8ad0cbc
DL		 2729
2730static struct pernet_operations igmp6_net_ops = {
2731 .init = igmp6_net_init,
2732 .exit = igmp6_net_exit,
2733};
2734
2735int __init igmp6_init(void)
2736{
2737 return register_pernet_subsys(&igmp6_net_ops);
2738}
2739
2740void igmp6_cleanup(void)
2741{
2742 unregister_pernet_subsys(&igmp6_net_ops);
2743}
Linux 6.x block layer and io_uring tree(s)