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net/ipv4/igmp.c: Remove unnecessary kmalloc casts
[net-next-2.6.git] / net / ipv6 / mcast.c
CommitLineData
1da177e4
LT		 1/*
2 * Multicast support for IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1ab1457c 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
1da177e4
LT		 9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16/* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
1da177e4
LT		 29#include <linux/module.h>
30#include <linux/errno.h>
31#include <linux/types.h>
32#include <linux/string.h>
33#include <linux/socket.h>
34#include <linux/sockios.h>
35#include <linux/jiffies.h>
36#include <linux/times.h>
37#include <linux/net.h>
38#include <linux/in.h>
39#include <linux/in6.h>
40#include <linux/netdevice.h>
41#include <linux/if_arp.h>
42#include <linux/route.h>
43#include <linux/init.h>
44#include <linux/proc_fs.h>
45#include <linux/seq_file.h>
5a0e3ad6 46#include <linux/slab.h>
6e7cb837 47#include <net/mld.h>
1da177e4
LT		 48
49#include <linux/netfilter.h>
50#include <linux/netfilter_ipv6.h>
51
457c4cbc 52#include <net/net_namespace.h>
1da177e4
LT		 53#include <net/sock.h>
54#include <net/snmp.h>
55
56#include <net/ipv6.h>
57#include <net/protocol.h>
58#include <net/if_inet6.h>
59#include <net/ndisc.h>
60#include <net/addrconf.h>
61#include <net/ip6_route.h>
1ed8516f 62#include <net/inet_common.h>
1da177e4
LT		 63
64#include <net/ip6_checksum.h>
65
66/* Set to 3 to get tracing... */
67#define MCAST_DEBUG 2
68
69#if MCAST_DEBUG >= 3
70#define MDBG(x) printk x
71#else
72#define MDBG(x)
73#endif
74
6e7cb837
YH		 75/* Ensure that we have struct in6_addr aligned on 32bit word. */
76static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
77 BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
78 BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
79 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
1da177e4
LT		 80};
81
82static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
83
84/* Big mc list lock for all the sockets */
85static DEFINE_RWLOCK(ipv6_sk_mc_lock);
86
1da177e4
LT		 87static void igmp6_join_group(struct ifmcaddr6 *ma);
88static void igmp6_leave_group(struct ifmcaddr6 *ma);
89static void igmp6_timer_handler(unsigned long data);
90
91static void mld_gq_timer_expire(unsigned long data);
92static void mld_ifc_timer_expire(unsigned long data);
93static void mld_ifc_event(struct inet6_dev *idev);
94static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
95static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
96static void mld_clear_delrec(struct inet6_dev *idev);
97static int sf_setstate(struct ifmcaddr6 *pmc);
98static void sf_markstate(struct ifmcaddr6 *pmc);
99static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
100static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
101 int sfmode, int sfcount, struct in6_addr *psfsrc,
102 int delta);
103static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
104 int sfmode, int sfcount, struct in6_addr *psfsrc,
105 int delta);
106static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
107 struct inet6_dev *idev);
108
109
110#define IGMP6_UNSOLICITED_IVAL (10*HZ)
111#define MLD_QRV_DEFAULT 2
112
53b7997f 113#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
1da177e4
LT		 114 (idev)->cnf.force_mld_version == 1 || \
115 ((idev)->mc_v1_seen && \
116 time_before(jiffies, (idev)->mc_v1_seen)))
117
6f4353d8 118#define IPV6_MLD_MAX_MSF 64
1da177e4 119
ab32ea5d 120int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 121
122/*
123 * socket join on multicast group
124 */
125
9acd9f3a 126int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 127{
128 struct net_device *dev = NULL;
129 struct ipv6_mc_socklist *mc_lst;
130 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 131 struct net *net = sock_net(sk);
1da177e4
LT		 132 int err;
133
134 if (!ipv6_addr_is_multicast(addr))
135 return -EINVAL;
136
c9e3e8b6
DS		 137 read_lock_bh(&ipv6_sk_mc_lock);
138 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
139 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
140 ipv6_addr_equal(&mc_lst->addr, addr)) {
141 read_unlock_bh(&ipv6_sk_mc_lock);
142 return -EADDRINUSE;
143 }
144 }
145 read_unlock_bh(&ipv6_sk_mc_lock);
146
1da177e4
LT		 147 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
148
149 if (mc_lst == NULL)
150 return -ENOMEM;
151
152 mc_lst->next = NULL;
153 ipv6_addr_copy(&mc_lst->addr, addr);
154
155 if (ifindex == 0) {
156 struct rt6_info *rt;
b8ad0cbc 157 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4
LT		 158 if (rt) {
159 dev = rt->rt6i_dev;
160 dev_hold(dev);
161 dst_release(&rt->u.dst);
162 }
163 } else
b8ad0cbc 164 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 165
166 if (dev == NULL) {
167 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
168 return -ENODEV;
169 }
170
171 mc_lst->ifindex = dev->ifindex;
172 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 173 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 174 mc_lst->sflist = NULL;
175
176 /*
177 * now add/increase the group membership on the device
178 */
179
180 err = ipv6_dev_mc_inc(dev, addr);
181
182 if (err) {
183 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
184 dev_put(dev);
185 return err;
186 }
187
188 write_lock_bh(&ipv6_sk_mc_lock);
189 mc_lst->next = np->ipv6_mc_list;
190 np->ipv6_mc_list = mc_lst;
191 write_unlock_bh(&ipv6_sk_mc_lock);
192
193 dev_put(dev);
194
195 return 0;
196}
197
198/*
199 * socket leave on multicast group
200 */
9acd9f3a 201int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 202{
203 struct ipv6_pinfo *np = inet6_sk(sk);
204 struct ipv6_mc_socklist *mc_lst, **lnk;
3b1e0a65 205 struct net *net = sock_net(sk);
1da177e4
LT		 206
207 write_lock_bh(&ipv6_sk_mc_lock);
208 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
209 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
210 ipv6_addr_equal(&mc_lst->addr, addr)) {
211 struct net_device *dev;
212
213 *lnk = mc_lst->next;
214 write_unlock_bh(&ipv6_sk_mc_lock);
215
b8ad0cbc
DL		 216 dev = dev_get_by_index(net, mc_lst->ifindex);
217 if (dev != NULL) {
1da177e4
LT		 218 struct inet6_dev *idev = in6_dev_get(dev);
219
acd6e00b 220 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 221 if (idev) {
1da177e4
LT		 222 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
223 in6_dev_put(idev);
224 }
225 dev_put(dev);
acd6e00b
DS		 226 } else
227 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 228 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
229 return 0;
230 }
231 }
232 write_unlock_bh(&ipv6_sk_mc_lock);
233
9951f036 234 return -EADDRNOTAVAIL;
1da177e4
LT		 235}
236
b8ad0cbc
DL		 237static struct inet6_dev *ip6_mc_find_dev(struct net *net,
238 struct in6_addr *group,
239 int ifindex)
1da177e4
LT		 240{
241 struct net_device *dev = NULL;
242 struct inet6_dev *idev = NULL;
243
244 if (ifindex == 0) {
245 struct rt6_info *rt;
246
b8ad0cbc 247 rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4
LT		 248 if (rt) {
249 dev = rt->rt6i_dev;
250 dev_hold(dev);
251 dst_release(&rt->u.dst);
252 }
253 } else
b8ad0cbc 254 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 255
256 if (!dev)
448eb71f 257 goto nodev;
1da177e4 258 idev = in6_dev_get(dev);
448eb71f
IJ		 259 if (!idev)
260 goto release;
1da177e4 261 read_lock_bh(&idev->lock);
448eb71f
IJ		 262 if (idev->dead)
263 goto unlock_release;
264
1da177e4 265 return idev;
448eb71f
IJ		 266
267unlock_release:
268 read_unlock_bh(&idev->lock);
269 in6_dev_put(idev);
270release:
271 dev_put(dev);
272nodev:
273 return NULL;
1da177e4
LT		 274}
275
276void ipv6_sock_mc_close(struct sock *sk)
277{
278 struct ipv6_pinfo *np = inet6_sk(sk);
279 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 280 struct net *net = sock_net(sk);
1da177e4
LT		 281
282 write_lock_bh(&ipv6_sk_mc_lock);
283 while ((mc_lst = np->ipv6_mc_list) != NULL) {
284 struct net_device *dev;
285
286 np->ipv6_mc_list = mc_lst->next;
287 write_unlock_bh(&ipv6_sk_mc_lock);
288
b8ad0cbc 289 dev = dev_get_by_index(net, mc_lst->ifindex);
1da177e4
LT		 290 if (dev) {
291 struct inet6_dev *idev = in6_dev_get(dev);
292
acd6e00b 293 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 294 if (idev) {
1da177e4
LT		 295 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
296 in6_dev_put(idev);
297 }
298 dev_put(dev);
acd6e00b
DS		 299 } else
300 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 301
302 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
303
304 write_lock_bh(&ipv6_sk_mc_lock);
305 }
306 write_unlock_bh(&ipv6_sk_mc_lock);
307}
308
309int ip6_mc_source(int add, int omode, struct sock *sk,
310 struct group_source_req *pgsr)
311{
312 struct in6_addr *source, *group;
313 struct ipv6_mc_socklist *pmc;
314 struct net_device *dev;
315 struct inet6_dev *idev;
316 struct ipv6_pinfo *inet6 = inet6_sk(sk);
317 struct ip6_sf_socklist *psl;
3b1e0a65 318 struct net *net = sock_net(sk);
1da177e4 319 int i, j, rv;
c9e3e8b6 320 int leavegroup = 0;
5ab4a6c8 321 int pmclocked = 0;
1da177e4
LT		 322 int err;
323
1da177e4
LT		 324 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
325 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
326
327 if (!ipv6_addr_is_multicast(group))
328 return -EINVAL;
329
b8ad0cbc 330 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
1da177e4
LT		 331 if (!idev)
332 return -ENODEV;
333 dev = idev->dev;
334
335 err = -EADDRNOTAVAIL;
336
c9e3e8b6 337 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 338 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
339 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
340 continue;
341 if (ipv6_addr_equal(&pmc->addr, group))
342 break;
343 }
917f2f10
DS		 344 if (!pmc) { /* must have a prior join */
345 err = -EINVAL;
1da177e4 346 goto done;
917f2f10 347 }
1da177e4
LT		 348 /* if a source filter was set, must be the same mode as before */
349 if (pmc->sflist) {
917f2f10
DS		 350 if (pmc->sfmode != omode) {
351 err = -EINVAL;
1da177e4 352 goto done;
917f2f10 353 }
1da177e4
LT		 354 } else if (pmc->sfmode != omode) {
355 /* allow mode switches for empty-set filters */
356 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
357 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
358 pmc->sfmode = omode;
359 }
360
5ab4a6c8
DS		 361 write_lock_bh(&pmc->sflock);
362 pmclocked = 1;
363
1da177e4
LT		 364 psl = pmc->sflist;
365 if (!add) {
366 if (!psl)
917f2f10 367 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 368 rv = !0;
369 for (i=0; i<psl->sl_count; i++) {
370 rv = memcmp(&psl->sl_addr[i], source,
371 sizeof(struct in6_addr));
372 if (rv == 0)
373 break;
374 }
375 if (rv) /* source not found */
917f2f10 376 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 377
c9e3e8b6
DS		 378 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
379 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
380 leavegroup = 1;
381 goto done;
382 }
383
1da177e4
LT		 384 /* update the interface filter */
385 ip6_mc_del_src(idev, group, omode, 1, source, 1);
386
387 for (j=i+1; j<psl->sl_count; j++)
388 psl->sl_addr[j-1] = psl->sl_addr[j];
389 psl->sl_count--;
390 err = 0;
391 goto done;
392 }
393 /* else, add a new source to the filter */
394
395 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
396 err = -ENOBUFS;
397 goto done;
398 }
399 if (!psl || psl->sl_count == psl->sl_max) {
400 struct ip6_sf_socklist *newpsl;
401 int count = IP6_SFBLOCK;
402
403 if (psl)
404 count += psl->sl_max;
8b3a7005 405 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 406 if (!newpsl) {
407 err = -ENOBUFS;
408 goto done;
409 }
410 newpsl->sl_max = count;
411 newpsl->sl_count = count - IP6_SFBLOCK;
412 if (psl) {
413 for (i=0; i<psl->sl_count; i++)
414 newpsl->sl_addr[i] = psl->sl_addr[i];
415 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
416 }
417 pmc->sflist = psl = newpsl;
418 }
419 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
420 for (i=0; i<psl->sl_count; i++) {
421 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
422 if (rv == 0)
423 break;
424 }
425 if (rv == 0) /* address already there is an error */
426 goto done;
427 for (j=psl->sl_count-1; j>=i; j--)
428 psl->sl_addr[j+1] = psl->sl_addr[j];
429 psl->sl_addr[i] = *source;
430 psl->sl_count++;
431 err = 0;
432 /* update the interface list */
433 ip6_mc_add_src(idev, group, omode, 1, source, 1);
434done:
5ab4a6c8
DS		 435 if (pmclocked)
436 write_unlock_bh(&pmc->sflock);
c9e3e8b6 437 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 438 read_unlock_bh(&idev->lock);
439 in6_dev_put(idev);
440 dev_put(dev);
c9e3e8b6
DS		 441 if (leavegroup)
442 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 443 return err;
444}
445
446int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
447{
448 struct in6_addr *group;
449 struct ipv6_mc_socklist *pmc;
450 struct net_device *dev;
451 struct inet6_dev *idev;
452 struct ipv6_pinfo *inet6 = inet6_sk(sk);
453 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 454 struct net *net = sock_net(sk);
9951f036 455 int leavegroup = 0;
1da177e4
LT		 456 int i, err;
457
458 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
459
460 if (!ipv6_addr_is_multicast(group))
461 return -EINVAL;
462 if (gsf->gf_fmode != MCAST_INCLUDE &&
463 gsf->gf_fmode != MCAST_EXCLUDE)
464 return -EINVAL;
465
b8ad0cbc 466 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 467
468 if (!idev)
469 return -ENODEV;
470 dev = idev->dev;
1da177e4 471
9c05989b 472 err = 0;
5ab4a6c8
DS		 473 read_lock_bh(&ipv6_sk_mc_lock);
474
9951f036
DS		 475 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
476 leavegroup = 1;
477 goto done;
478 }
479
1da177e4
LT		 480 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
481 if (pmc->ifindex != gsf->gf_interface)
482 continue;
483 if (ipv6_addr_equal(&pmc->addr, group))
484 break;
485 }
917f2f10
DS		 486 if (!pmc) { /* must have a prior join */
487 err = -EINVAL;
1da177e4 488 goto done;
917f2f10 489 }
1da177e4 490 if (gsf->gf_numsrc) {
8b3a7005
KK		 491 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
492 GFP_ATOMIC);
1da177e4
LT		 493 if (!newpsl) {
494 err = -ENOBUFS;
495 goto done;
496 }
497 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
498 for (i=0; i<newpsl->sl_count; ++i) {
499 struct sockaddr_in6 *psin6;
500
501 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
502 newpsl->sl_addr[i] = psin6->sin6_addr;
503 }
504 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
505 newpsl->sl_count, newpsl->sl_addr, 0);
506 if (err) {
507 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
508 goto done;
509 }
8713dbf0 510 } else {
1da177e4 511 newpsl = NULL;
8713dbf0
YZ		 512 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
513 }
5ab4a6c8
DS		 514
515 write_lock_bh(&pmc->sflock);
1da177e4
LT		 516 psl = pmc->sflist;
517 if (psl) {
518 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
519 psl->sl_count, psl->sl_addr, 0);
520 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
521 } else
522 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
523 pmc->sflist = newpsl;
524 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 525 write_unlock_bh(&pmc->sflock);
917f2f10 526 err = 0;
1da177e4 527done:
5ab4a6c8 528 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 529 read_unlock_bh(&idev->lock);
530 in6_dev_put(idev);
531 dev_put(dev);
9951f036
DS		 532 if (leavegroup)
533 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 534 return err;
535}
536
537int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
538 struct group_filter __user *optval, int __user *optlen)
539{
540 int err, i, count, copycount;
541 struct in6_addr *group;
542 struct ipv6_mc_socklist *pmc;
543 struct inet6_dev *idev;
544 struct net_device *dev;
545 struct ipv6_pinfo *inet6 = inet6_sk(sk);
546 struct ip6_sf_socklist *psl;
3b1e0a65 547 struct net *net = sock_net(sk);
1da177e4
LT		 548
549 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
550
551 if (!ipv6_addr_is_multicast(group))
552 return -EINVAL;
553
b8ad0cbc 554 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 555
556 if (!idev)
557 return -ENODEV;
558
559 dev = idev->dev;
560
561 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 562 /*
563 * changes to the ipv6_mc_list require the socket lock and
564 * a read lock on ip6_sk_mc_lock. We have the socket lock,
565 * so reading the list is safe.
566 */
1da177e4
LT		 567
568 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
569 if (pmc->ifindex != gsf->gf_interface)
570 continue;
571 if (ipv6_addr_equal(group, &pmc->addr))
572 break;
573 }
574 if (!pmc) /* must have a prior join */
575 goto done;
576 gsf->gf_fmode = pmc->sfmode;
577 psl = pmc->sflist;
578 count = psl ? psl->sl_count : 0;
579 read_unlock_bh(&idev->lock);
580 in6_dev_put(idev);
581 dev_put(dev);
582
583 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
584 gsf->gf_numsrc = count;
585 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
586 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
587 return -EFAULT;
588 }
5ab4a6c8
DS		 589 /* changes to psl require the socket lock, a read lock on
590 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
591 * have the socket lock, so reading here is safe.
592 */
1da177e4
LT		 593 for (i=0; i<copycount; i++) {
594 struct sockaddr_in6 *psin6;
595 struct sockaddr_storage ss;
596
597 psin6 = (struct sockaddr_in6 *)&ss;
598 memset(&ss, 0, sizeof(ss));
599 psin6->sin6_family = AF_INET6;
600 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 601 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 602 return -EFAULT;
603 }
604 return 0;
605done:
606 read_unlock_bh(&idev->lock);
607 in6_dev_put(idev);
608 dev_put(dev);
609 return err;
610}
611
9acd9f3a
YH		 612int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
613 const struct in6_addr *src_addr)
1da177e4
LT		 614{
615 struct ipv6_pinfo *np = inet6_sk(sk);
616 struct ipv6_mc_socklist *mc;
617 struct ip6_sf_socklist *psl;
618 int rv = 1;
619
620 read_lock(&ipv6_sk_mc_lock);
621 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
622 if (ipv6_addr_equal(&mc->addr, mc_addr))
623 break;
624 }
625 if (!mc) {
626 read_unlock(&ipv6_sk_mc_lock);
627 return 1;
628 }
5ab4a6c8 629 read_lock(&mc->sflock);
1da177e4
LT		 630 psl = mc->sflist;
631 if (!psl) {
632 rv = mc->sfmode == MCAST_EXCLUDE;
633 } else {
634 int i;
635
636 for (i=0; i<psl->sl_count; i++) {
637 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
638 break;
639 }
640 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
641 rv = 0;
642 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
643 rv = 0;
644 }
5ab4a6c8 645 read_unlock(&mc->sflock);
1da177e4
LT		 646 read_unlock(&ipv6_sk_mc_lock);
647
648 return rv;
649}
650
651static void ma_put(struct ifmcaddr6 *mc)
652{
653 if (atomic_dec_and_test(&mc->mca_refcnt)) {
654 in6_dev_put(mc->idev);
655 kfree(mc);
656 }
657}
658
659static void igmp6_group_added(struct ifmcaddr6 *mc)
660{
661 struct net_device *dev = mc->idev->dev;
662 char buf[MAX_ADDR_LEN];
663
664 spin_lock_bh(&mc->mca_lock);
665 if (!(mc->mca_flags&MAF_LOADED)) {
666 mc->mca_flags |= MAF_LOADED;
667 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 668 dev_mc_add(dev, buf);
1da177e4
LT		 669 }
670 spin_unlock_bh(&mc->mca_lock);
671
672 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
673 return;
674
675 if (MLD_V1_SEEN(mc->idev)) {
676 igmp6_join_group(mc);
677 return;
678 }
679 /* else v2 */
680
681 mc->mca_crcount = mc->idev->mc_qrv;
682 mld_ifc_event(mc->idev);
683}
684
685static void igmp6_group_dropped(struct ifmcaddr6 *mc)
686{
687 struct net_device *dev = mc->idev->dev;
688 char buf[MAX_ADDR_LEN];
689
690 spin_lock_bh(&mc->mca_lock);
691 if (mc->mca_flags&MAF_LOADED) {
692 mc->mca_flags &= ~MAF_LOADED;
693 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
22bedad3 694 dev_mc_del(dev, buf);
1da177e4
LT		 695 }
696
697 if (mc->mca_flags & MAF_NOREPORT)
698 goto done;
699 spin_unlock_bh(&mc->mca_lock);
700
701 if (!mc->idev->dead)
702 igmp6_leave_group(mc);
703
704 spin_lock_bh(&mc->mca_lock);
705 if (del_timer(&mc->mca_timer))
706 atomic_dec(&mc->mca_refcnt);
707done:
708 ip6_mc_clear_src(mc);
709 spin_unlock_bh(&mc->mca_lock);
710}
711
712/*
713 * deleted ifmcaddr6 manipulation
714 */
715static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
716{
717 struct ifmcaddr6 *pmc;
718
719 /* this is an "ifmcaddr6" for convenience; only the fields below
720 * are actually used. In particular, the refcnt and users are not
721 * used for management of the delete list. Using the same structure
722 * for deleted items allows change reports to use common code with
723 * non-deleted or query-response MCA's.
724 */
0c600eda 725 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 726 if (!pmc)
727 return;
0c600eda 728
1da177e4
LT		 729 spin_lock_bh(&im->mca_lock);
730 spin_lock_init(&pmc->mca_lock);
731 pmc->idev = im->idev;
732 in6_dev_hold(idev);
733 pmc->mca_addr = im->mca_addr;
734 pmc->mca_crcount = idev->mc_qrv;
735 pmc->mca_sfmode = im->mca_sfmode;
736 if (pmc->mca_sfmode == MCAST_INCLUDE) {
737 struct ip6_sf_list *psf;
738
739 pmc->mca_tomb = im->mca_tomb;
740 pmc->mca_sources = im->mca_sources;
741 im->mca_tomb = im->mca_sources = NULL;
742 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
743 psf->sf_crcount = pmc->mca_crcount;
744 }
745 spin_unlock_bh(&im->mca_lock);
746
6457d26b 747 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 748 pmc->next = idev->mc_tomb;
749 idev->mc_tomb = pmc;
6457d26b 750 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 751}
752
753static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
754{
755 struct ifmcaddr6 *pmc, *pmc_prev;
756 struct ip6_sf_list *psf, *psf_next;
757
6457d26b 758 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 759 pmc_prev = NULL;
760 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
761 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
762 break;
763 pmc_prev = pmc;
764 }
765 if (pmc) {
766 if (pmc_prev)
767 pmc_prev->next = pmc->next;
768 else
769 idev->mc_tomb = pmc->next;
770 }
6457d26b
SH		 771 spin_unlock_bh(&idev->mc_lock);
772
1da177e4
LT		 773 if (pmc) {
774 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
775 psf_next = psf->sf_next;
776 kfree(psf);
777 }
778 in6_dev_put(pmc->idev);
779 kfree(pmc);
780 }
781}
782
783static void mld_clear_delrec(struct inet6_dev *idev)
784{
785 struct ifmcaddr6 *pmc, *nextpmc;
786
6457d26b 787 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 788 pmc = idev->mc_tomb;
789 idev->mc_tomb = NULL;
6457d26b 790 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 791
792 for (; pmc; pmc = nextpmc) {
793 nextpmc = pmc->next;
794 ip6_mc_clear_src(pmc);
795 in6_dev_put(pmc->idev);
796 kfree(pmc);
797 }
798
799 /* clear dead sources, too */
800 read_lock_bh(&idev->lock);
801 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
802 struct ip6_sf_list *psf, *psf_next;
803
804 spin_lock_bh(&pmc->mca_lock);
805 psf = pmc->mca_tomb;
806 pmc->mca_tomb = NULL;
807 spin_unlock_bh(&pmc->mca_lock);
808 for (; psf; psf=psf_next) {
809 psf_next = psf->sf_next;
810 kfree(psf);
811 }
812 }
813 read_unlock_bh(&idev->lock);
814}
815
816
817/*
818 * device multicast group inc (add if not found)
819 */
9acd9f3a 820int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 821{
822 struct ifmcaddr6 *mc;
823 struct inet6_dev *idev;
824
825 idev = in6_dev_get(dev);
826
827 if (idev == NULL)
828 return -EINVAL;
829
830 write_lock_bh(&idev->lock);
831 if (idev->dead) {
832 write_unlock_bh(&idev->lock);
833 in6_dev_put(idev);
834 return -ENODEV;
835 }
836
837 for (mc = idev->mc_list; mc; mc = mc->next) {
838 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
839 mc->mca_users++;
840 write_unlock_bh(&idev->lock);
841 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
842 NULL, 0);
843 in6_dev_put(idev);
844 return 0;
845 }
846 }
847
848 /*
849 * not found: create a new one.
850 */
851
0c600eda 852 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 853
854 if (mc == NULL) {
855 write_unlock_bh(&idev->lock);
856 in6_dev_put(idev);
857 return -ENOMEM;
858 }
859
b24b8a24 860 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4
LT		 861
862 ipv6_addr_copy(&mc->mca_addr, addr);
863 mc->idev = idev;
864 mc->mca_users = 1;
865 /* mca_stamp should be updated upon changes */
866 mc->mca_cstamp = mc->mca_tstamp = jiffies;
867 atomic_set(&mc->mca_refcnt, 2);
868 spin_lock_init(&mc->mca_lock);
869
870 /* initial mode is (EX, empty) */
871 mc->mca_sfmode = MCAST_EXCLUDE;
872 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
873
874 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
875 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
876 mc->mca_flags |= MAF_NOREPORT;
877
878 mc->next = idev->mc_list;
879 idev->mc_list = mc;
880 write_unlock_bh(&idev->lock);
881
882 mld_del_delrec(idev, &mc->mca_addr);
883 igmp6_group_added(mc);
884 ma_put(mc);
885 return 0;
886}
887
888/*
889 * device multicast group del
890 */
9acd9f3a 891int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 892{
893 struct ifmcaddr6 *ma, **map;
894
895 write_lock_bh(&idev->lock);
896 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
897 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
898 if (--ma->mca_users == 0) {
899 *map = ma->next;
900 write_unlock_bh(&idev->lock);
901
902 igmp6_group_dropped(ma);
903
904 ma_put(ma);
905 return 0;
906 }
907 write_unlock_bh(&idev->lock);
908 return 0;
909 }
910 }
911 write_unlock_bh(&idev->lock);
912
913 return -ENOENT;
914}
915
9acd9f3a 916int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 917{
918 struct inet6_dev *idev = in6_dev_get(dev);
919 int err;
920
921 if (!idev)
922 return -ENODEV;
923
924 err = __ipv6_dev_mc_dec(idev, addr);
925
926 in6_dev_put(idev);
927
928 return err;
929}
930
931/*
932 * identify MLD packets for MLD filter exceptions
933 */
934int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
935{
936 struct icmp6hdr *pic;
937
938 if (nexthdr != IPPROTO_ICMPV6)
939 return 0;
940
941 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
942 return 0;
943
cc70ab26 944 pic = icmp6_hdr(skb);
1da177e4
LT		 945
946 switch (pic->icmp6_type) {
947 case ICMPV6_MGM_QUERY:
948 case ICMPV6_MGM_REPORT:
949 case ICMPV6_MGM_REDUCTION:
950 case ICMPV6_MLD2_REPORT:
951 return 1;
952 default:
953 break;
954 }
955 return 0;
956}
957
958/*
959 * check if the interface/address pair is valid
960 */
9acd9f3a
YH		 961int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
962 const struct in6_addr *src_addr)
1da177e4
LT		 963{
964 struct inet6_dev *idev;
965 struct ifmcaddr6 *mc;
966 int rv = 0;
967
968 idev = in6_dev_get(dev);
969 if (idev) {
970 read_lock_bh(&idev->lock);
971 for (mc = idev->mc_list; mc; mc=mc->next) {
972 if (ipv6_addr_equal(&mc->mca_addr, group))
973 break;
974 }
975 if (mc) {
976 if (src_addr && !ipv6_addr_any(src_addr)) {
977 struct ip6_sf_list *psf;
978
979 spin_lock_bh(&mc->mca_lock);
980 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
981 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
982 break;
983 }
984 if (psf)
985 rv = psf->sf_count[MCAST_INCLUDE] ||
986 psf->sf_count[MCAST_EXCLUDE] !=
987 mc->mca_sfcount[MCAST_EXCLUDE];
988 else
989 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
990 spin_unlock_bh(&mc->mca_lock);
991 } else
992 rv = 1; /* don't filter unspecified source */
993 }
994 read_unlock_bh(&idev->lock);
995 in6_dev_put(idev);
996 }
997 return rv;
998}
999
1000static void mld_gq_start_timer(struct inet6_dev *idev)
1001{
1002 int tv = net_random() % idev->mc_maxdelay;
1003
1004 idev->mc_gq_running = 1;
1005 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1006 in6_dev_hold(idev);
1007}
1008
1009static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1010{
1011 int tv = net_random() % delay;
1012
1013 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1014 in6_dev_hold(idev);
1015}
1016
1017/*
1018 * IGMP handling (alias multicast ICMPv6 messages)
1019 */
1020
1021static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1022{
1023 unsigned long delay = resptime;
1024
1025 /* Do not start timer for these addresses */
1026 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1027 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1028 return;
1029
1030 if (del_timer(&ma->mca_timer)) {
1031 atomic_dec(&ma->mca_refcnt);
1032 delay = ma->mca_timer.expires - jiffies;
1033 }
1034
1035 if (delay >= resptime) {
1036 if (resptime)
1037 delay = net_random() % resptime;
1038 else
1039 delay = 1;
1040 }
1041 ma->mca_timer.expires = jiffies + delay;
1042 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1043 atomic_inc(&ma->mca_refcnt);
1044 ma->mca_flags |= MAF_TIMER_RUNNING;
1045}
1046
5ab4a6c8
DS		 1047/* mark EXCLUDE-mode sources */
1048static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1049 struct in6_addr *srcs)
1050{
1051 struct ip6_sf_list *psf;
1052 int i, scount;
1053
1054 scount = 0;
1055 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1056 if (scount == nsrcs)
1057 break;
5ab4a6c8
DS		 1058 for (i=0; i<nsrcs; i++) {
1059 /* skip inactive filters */
1060 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1061 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1062 psf->sf_count[MCAST_EXCLUDE])
1063 continue;
1064 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1065 scount++;
1066 break;
1067 }
1068 }
1069 }
1070 pmc->mca_flags &= ~MAF_GSQUERY;
1071 if (scount == nsrcs) /* all sources excluded */
1072 return 0;
1073 return 1;
1074}
1075
1076static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1077 struct in6_addr *srcs)
1078{
1079 struct ip6_sf_list *psf;
1080 int i, scount;
1081
1082 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1083 return mld_xmarksources(pmc, nsrcs, srcs);
1084
1085 /* mark INCLUDE-mode sources */
1086
1087 scount = 0;
1088 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1089 if (scount == nsrcs)
1090 break;
1091 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1092 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1093 psf->sf_gsresp = 1;
1094 scount++;
1095 break;
1096 }
5ab4a6c8
DS		 1097 }
1098 }
1099 if (!scount) {
1100 pmc->mca_flags &= ~MAF_GSQUERY;
1101 return 0;
1da177e4 1102 }
5ab4a6c8
DS		 1103 pmc->mca_flags |= MAF_GSQUERY;
1104 return 1;
1da177e4
LT		 1105}
1106
1107int igmp6_event_query(struct sk_buff *skb)
1108{
97300b5f 1109 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1110 struct ifmcaddr6 *ma;
1111 struct in6_addr *group;
1112 unsigned long max_delay;
1113 struct inet6_dev *idev;
6e7cb837 1114 struct mld_msg *mld;
1da177e4
LT		 1115 int group_type;
1116 int mark = 0;
1117 int len;
1118
1119 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1120 return -EINVAL;
1121
1122 /* compute payload length excluding extension headers */
0660e03f 1123 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1124 len -= skb_network_header_len(skb);
1da177e4
LT		 1125
1126 /* Drop queries with not link local source */
0660e03f 1127 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1128 return -EINVAL;
1129
1130 idev = in6_dev_get(skb->dev);
1131
1132 if (idev == NULL)
1133 return 0;
1134
6e7cb837
YH		 1135 mld = (struct mld_msg *)icmp6_hdr(skb);
1136 group = &mld->mld_mca;
1da177e4
LT		 1137 group_type = ipv6_addr_type(group);
1138
1139 if (group_type != IPV6_ADDR_ANY &&
1140 !(group_type&IPV6_ADDR_MULTICAST)) {
1141 in6_dev_put(idev);
1142 return -EINVAL;
1143 }
1144
1145 if (len == 24) {
1146 int switchback;
1147 /* MLDv1 router present */
1148
1149 /* Translate milliseconds to jiffies */
6e7cb837 1150 max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1da177e4
LT		 1151
1152 switchback = (idev->mc_qrv + 1) * max_delay;
1153 idev->mc_v1_seen = jiffies + switchback;
1154
1155 /* cancel the interface change timer */
1156 idev->mc_ifc_count = 0;
1157 if (del_timer(&idev->mc_ifc_timer))
1158 __in6_dev_put(idev);
1159 /* clear deleted report items */
1160 mld_clear_delrec(idev);
1161 } else if (len >= 28) {
1ab1457c 1162 int srcs_offset = sizeof(struct mld2_query) -
97300b5f
YZ		 1163 sizeof(struct icmp6hdr);
1164 if (!pskb_may_pull(skb, srcs_offset)) {
1165 in6_dev_put(idev);
1166 return -EINVAL;
1167 }
9c70220b 1168 mlh2 = (struct mld2_query *)skb_transport_header(skb);
6e7cb837 1169 max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1da177e4
LT		 1170 if (!max_delay)
1171 max_delay = 1;
1172 idev->mc_maxdelay = max_delay;
6e7cb837
YH		 1173 if (mlh2->mld2q_qrv)
1174 idev->mc_qrv = mlh2->mld2q_qrv;
1da177e4 1175 if (group_type == IPV6_ADDR_ANY) { /* general query */
6e7cb837 1176 if (mlh2->mld2q_nsrcs) {
1da177e4
LT		 1177 in6_dev_put(idev);
1178 return -EINVAL; /* no sources allowed */
1179 }
1180 mld_gq_start_timer(idev);
1181 in6_dev_put(idev);
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 +
6e7cb837 1187 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1188 in6_dev_put(idev);
1189 return -EINVAL;
1190 }
9c70220b 1191 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1192 mark = 1;
1193 }
1da177e4
LT		 1194 } else {
1195 in6_dev_put(idev);
1196 return -EINVAL;
1197 }
1198
1199 read_lock_bh(&idev->lock);
1200 if (group_type == IPV6_ADDR_ANY) {
1201 for (ma = idev->mc_list; ma; ma=ma->next) {
1202 spin_lock_bh(&ma->mca_lock);
1203 igmp6_group_queried(ma, max_delay);
1204 spin_unlock_bh(&ma->mca_lock);
1205 }
1206 } else {
1207 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1208 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1209 continue;
1210 spin_lock_bh(&ma->mca_lock);
1211 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1212 /* gsquery <- gsquery && mark */
1213 if (!mark)
1214 ma->mca_flags &= ~MAF_GSQUERY;
1215 } else {
1216 /* gsquery <- mark */
1217 if (mark)
1218 ma->mca_flags |= MAF_GSQUERY;
1219 else
1220 ma->mca_flags &= ~MAF_GSQUERY;
1221 }
5ab4a6c8 1222 if (!(ma->mca_flags & MAF_GSQUERY) ||
6e7cb837 1223 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
5ab4a6c8 1224 igmp6_group_queried(ma, max_delay);
1da177e4 1225 spin_unlock_bh(&ma->mca_lock);
7add2a43 1226 break;
1da177e4
LT		 1227 }
1228 }
1229 read_unlock_bh(&idev->lock);
1230 in6_dev_put(idev);
1231
1232 return 0;
1233}
1234
1235
1236int igmp6_event_report(struct sk_buff *skb)
1237{
1238 struct ifmcaddr6 *ma;
1da177e4 1239 struct inet6_dev *idev;
6e7cb837 1240 struct mld_msg *mld;
1da177e4
LT		 1241 int addr_type;
1242
1243 /* Our own report looped back. Ignore it. */
1244 if (skb->pkt_type == PACKET_LOOPBACK)
1245 return 0;
1246
24c69275
DS		 1247 /* send our report if the MC router may not have heard this report */
1248 if (skb->pkt_type != PACKET_MULTICAST &&
1249 skb->pkt_type != PACKET_BROADCAST)
1250 return 0;
1251
6e7cb837 1252 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1da177e4
LT		 1253 return -EINVAL;
1254
6e7cb837 1255 mld = (struct mld_msg *)icmp6_hdr(skb);
1da177e4
LT		 1256
1257 /* Drop reports with not link local source */
0660e03f 1258 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1259 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1260 !(addr_type&IPV6_ADDR_LINKLOCAL))
1261 return -EINVAL;
1262
1da177e4
LT		 1263 idev = in6_dev_get(skb->dev);
1264 if (idev == NULL)
1265 return -ENODEV;
1266
1267 /*
1268 * Cancel the timer for this group
1269 */
1270
1271 read_lock_bh(&idev->lock);
1272 for (ma = idev->mc_list; ma; ma=ma->next) {
6e7cb837 1273 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1da177e4
LT		 1274 spin_lock(&ma->mca_lock);
1275 if (del_timer(&ma->mca_timer))
1276 atomic_dec(&ma->mca_refcnt);
1277 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1278 spin_unlock(&ma->mca_lock);
1279 break;
1280 }
1281 }
1282 read_unlock_bh(&idev->lock);
1283 in6_dev_put(idev);
1284 return 0;
1285}
1286
1287static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1288 int gdeleted, int sdeleted)
1289{
1290 switch (type) {
1291 case MLD2_MODE_IS_INCLUDE:
1292 case MLD2_MODE_IS_EXCLUDE:
1293 if (gdeleted || sdeleted)
1294 return 0;
5ab4a6c8
DS		 1295 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1296 if (pmc->mca_sfmode == MCAST_INCLUDE)
1297 return 1;
1298 /* don't include if this source is excluded
1299 * in all filters
1300 */
1301 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1302 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1303 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1304 psf->sf_count[MCAST_EXCLUDE];
1305 }
1306 return 0;
1da177e4
LT		 1307 case MLD2_CHANGE_TO_INCLUDE:
1308 if (gdeleted || sdeleted)
1309 return 0;
1310 return psf->sf_count[MCAST_INCLUDE] != 0;
1311 case MLD2_CHANGE_TO_EXCLUDE:
1312 if (gdeleted || sdeleted)
1313 return 0;
1314 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1315 psf->sf_count[MCAST_INCLUDE])
1316 return 0;
1317 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1318 psf->sf_count[MCAST_EXCLUDE];
1319 case MLD2_ALLOW_NEW_SOURCES:
1320 if (gdeleted || !psf->sf_crcount)
1321 return 0;
1322 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1323 case MLD2_BLOCK_OLD_SOURCES:
1324 if (pmc->mca_sfmode == MCAST_INCLUDE)
1325 return gdeleted || (psf->sf_crcount && sdeleted);
1326 return psf->sf_crcount && !gdeleted && !sdeleted;
1327 }
1328 return 0;
1329}
1330
1331static int
1332mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1333{
1334 struct ip6_sf_list *psf;
1335 int scount = 0;
1336
1337 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1338 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1339 continue;
1340 scount++;
1341 }
1342 return scount;
1343}
1344
1345static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1346{
c346dca1 1347 struct net *net = dev_net(dev);
b8ad0cbc 1348 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1349 struct sk_buff *skb;
1350 struct mld2_report *pmr;
1351 struct in6_addr addr_buf;
d7aabf22 1352 const struct in6_addr *saddr;
1da177e4
LT		 1353 int err;
1354 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1355 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1356 IPV6_TLV_PADN, 0 };
1357
1358 /* we assume size > sizeof(ra) here */
f5184d26 1359 skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
1da177e4 1360
cfcabdcc 1361 if (!skb)
1da177e4
LT		 1362 return NULL;
1363
1364 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1365
95c385b4 1366 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1367 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1368 * use unspecified address as the source address
1da177e4
LT		 1369 * when a valid link-local address is not available.
1370 */
d7aabf22
YH		 1371 saddr = &in6addr_any;
1372 } else
1373 saddr = &addr_buf;
1da177e4 1374
d7aabf22 1375 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4
LT		 1376
1377 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1378
27a884dc 1379 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1380 skb_put(skb, sizeof(*pmr));
1381 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837
YH		 1382 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1383 pmr->mld2r_resv1 = 0;
1384 pmr->mld2r_cksum = 0;
1385 pmr->mld2r_resv2 = 0;
1386 pmr->mld2r_ngrec = 0;
1da177e4
LT		 1387 return skb;
1388}
1389
1390static void mld_sendpack(struct sk_buff *skb)
1391{
0660e03f 1392 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1393 struct mld2_report *pmr =
1394 (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1395 int payload_len, mldlen;
1396 struct inet6_dev *idev = in6_dev_get(skb->dev);
c346dca1 1397 struct net *net = dev_net(skb->dev);
1da177e4 1398 int err;
41927178 1399 struct flowi fl;
adf30907 1400 struct dst_entry *dst;
1da177e4 1401
edf391ff
NH		 1402 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1403
27a884dc
ACM		 1404 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1405 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1406 pip6->payload_len = htons(payload_len);
1407
6e7cb837
YH		 1408 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1409 IPPROTO_ICMPV6,
1410 csum_partial(skb_transport_header(skb),
1411 mldlen, 0));
41927178 1412
adf30907 1413 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
41927178 1414
adf30907 1415 if (!dst) {
41927178
YH		 1416 err = -ENOMEM;
1417 goto err_out;
1418 }
1419
b8ad0cbc 1420 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
41927178
YH		 1421 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1422 skb->dev->ifindex);
1423
adf30907
ED		 1424 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1425 skb_dst_set(skb, dst);
41927178
YH		 1426 if (err)
1427 goto err_out;
1428
edf391ff
NH		 1429 payload_len = skb->len;
1430
b2e0b385 1431 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1432 dst_output);
1433out:
1da177e4 1434 if (!err) {
5a57d4c7 1435 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
e41b5368 1436 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1437 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1da177e4 1438 } else
483a47d2 1439 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1440
1441 if (likely(idev != NULL))
1442 in6_dev_put(idev);
41927178
YH		 1443 return;
1444
1445err_out:
1446 kfree_skb(skb);
1447 goto out;
1da177e4
LT		 1448}
1449
1450static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1451{
fab10fe3 1452 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1453}
1454
1455static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1456 int type, struct mld2_grec **ppgr)
1457{
1458 struct net_device *dev = pmc->idev->dev;
1459 struct mld2_report *pmr;
1460 struct mld2_grec *pgr;
1461
1462 if (!skb)
1463 skb = mld_newpack(dev, dev->mtu);
1464 if (!skb)
1465 return NULL;
1466 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1467 pgr->grec_type = type;
1468 pgr->grec_auxwords = 0;
1469 pgr->grec_nsrcs = 0;
1470 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1471 pmr = (struct mld2_report *)skb_transport_header(skb);
6e7cb837 1472 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1da177e4
LT		 1473 *ppgr = pgr;
1474 return skb;
1475}
1476
1477#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1478 skb_tailroom(skb)) : 0)
1479
1480static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1481 int type, int gdeleted, int sdeleted)
1482{
1483 struct net_device *dev = pmc->idev->dev;
1484 struct mld2_report *pmr;
1485 struct mld2_grec *pgr = NULL;
1486 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1487 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1488
1489 if (pmc->mca_flags & MAF_NOREPORT)
1490 return skb;
1491
1492 isquery = type == MLD2_MODE_IS_INCLUDE ||
1493 type == MLD2_MODE_IS_EXCLUDE;
1494 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1495 type == MLD2_CHANGE_TO_EXCLUDE;
1496
5ab4a6c8
DS		 1497 stotal = scount = 0;
1498
1da177e4
LT		 1499 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1500
5ab4a6c8
DS		 1501 if (!*psf_list)
1502 goto empty_source;
1503
9c70220b 1504 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1505
1506 /* EX and TO_EX get a fresh packet, if needed */
1507 if (truncate) {
6e7cb837 1508 if (pmr && pmr->mld2r_ngrec &&
1da177e4
LT		 1509 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1510 if (skb)
1511 mld_sendpack(skb);
1512 skb = mld_newpack(dev, dev->mtu);
1513 }
1514 }
1515 first = 1;
1da177e4
LT		 1516 psf_prev = NULL;
1517 for (psf=*psf_list; psf; psf=psf_next) {
1518 struct in6_addr *psrc;
1519
1520 psf_next = psf->sf_next;
1521
1522 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1523 psf_prev = psf;
1524 continue;
1525 }
1526
1527 /* clear marks on query responses */
1528 if (isquery)
1529 psf->sf_gsresp = 0;
1530
1531 if (AVAILABLE(skb) < sizeof(*psrc) +
1532 first*sizeof(struct mld2_grec)) {
1533 if (truncate && !first)
1534 break; /* truncate these */
1535 if (pgr)
1536 pgr->grec_nsrcs = htons(scount);
1537 if (skb)
1538 mld_sendpack(skb);
1539 skb = mld_newpack(dev, dev->mtu);
1540 first = 1;
1541 scount = 0;
1542 }
1543 if (first) {
1544 skb = add_grhead(skb, pmc, type, &pgr);
1545 first = 0;
1546 }
cc63f70b
AD		 1547 if (!skb)
1548 return NULL;
1da177e4
LT		 1549 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1550 *psrc = psf->sf_addr;
5ab4a6c8 1551 scount++; stotal++;
1da177e4
LT		 1552 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1553 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1554 psf->sf_crcount--;
1555 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1556 if (psf_prev)
1557 psf_prev->sf_next = psf->sf_next;
1558 else
1559 *psf_list = psf->sf_next;
1560 kfree(psf);
1561 continue;
1562 }
1563 }
1564 psf_prev = psf;
1565 }
5ab4a6c8
DS		 1566
1567empty_source:
1568 if (!stotal) {
1569 if (type == MLD2_ALLOW_NEW_SOURCES ||
1570 type == MLD2_BLOCK_OLD_SOURCES)
1571 return skb;
1572 if (pmc->mca_crcount || isquery) {
1573 /* make sure we have room for group header */
1574 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1575 mld_sendpack(skb);
1576 skb = NULL; /* add_grhead will get a new one */
1577 }
1578 skb = add_grhead(skb, pmc, type, &pgr);
1579 }
1580 }
1da177e4
LT		 1581 if (pgr)
1582 pgr->grec_nsrcs = htons(scount);
1583
1584 if (isquery)
1585 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1586 return skb;
1587}
1588
1589static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1590{
1591 struct sk_buff *skb = NULL;
1592 int type;
1593
1594 if (!pmc) {
1595 read_lock_bh(&idev->lock);
1596 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1597 if (pmc->mca_flags & MAF_NOREPORT)
1598 continue;
1599 spin_lock_bh(&pmc->mca_lock);
1600 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1601 type = MLD2_MODE_IS_EXCLUDE;
1602 else
1603 type = MLD2_MODE_IS_INCLUDE;
1604 skb = add_grec(skb, pmc, type, 0, 0);
1605 spin_unlock_bh(&pmc->mca_lock);
1606 }
1607 read_unlock_bh(&idev->lock);
1608 } else {
1609 spin_lock_bh(&pmc->mca_lock);
1610 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1611 type = MLD2_MODE_IS_EXCLUDE;
1612 else
1613 type = MLD2_MODE_IS_INCLUDE;
1614 skb = add_grec(skb, pmc, type, 0, 0);
1615 spin_unlock_bh(&pmc->mca_lock);
1616 }
1617 if (skb)
1618 mld_sendpack(skb);
1619}
1620
1621/*
1622 * remove zero-count source records from a source filter list
1623 */
1624static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1625{
1626 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1627
1628 psf_prev = NULL;
1629 for (psf=*ppsf; psf; psf = psf_next) {
1630 psf_next = psf->sf_next;
1631 if (psf->sf_crcount == 0) {
1632 if (psf_prev)
1633 psf_prev->sf_next = psf->sf_next;
1634 else
1635 *ppsf = psf->sf_next;
1636 kfree(psf);
1637 } else
1638 psf_prev = psf;
1639 }
1640}
1641
1642static void mld_send_cr(struct inet6_dev *idev)
1643{
1644 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1645 struct sk_buff *skb = NULL;
1646 int type, dtype;
1647
1648 read_lock_bh(&idev->lock);
6457d26b 1649 spin_lock(&idev->mc_lock);
1da177e4
LT		 1650
1651 /* deleted MCA's */
1652 pmc_prev = NULL;
1653 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1654 pmc_next = pmc->next;
1655 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1656 type = MLD2_BLOCK_OLD_SOURCES;
1657 dtype = MLD2_BLOCK_OLD_SOURCES;
1658 skb = add_grec(skb, pmc, type, 1, 0);
1659 skb = add_grec(skb, pmc, dtype, 1, 1);
1660 }
1661 if (pmc->mca_crcount) {
1da177e4
LT		 1662 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1663 type = MLD2_CHANGE_TO_INCLUDE;
1664 skb = add_grec(skb, pmc, type, 1, 0);
1665 }
5ab4a6c8 1666 pmc->mca_crcount--;
1da177e4
LT		 1667 if (pmc->mca_crcount == 0) {
1668 mld_clear_zeros(&pmc->mca_tomb);
1669 mld_clear_zeros(&pmc->mca_sources);
1670 }
1671 }
1672 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1673 !pmc->mca_sources) {
1674 if (pmc_prev)
1675 pmc_prev->next = pmc_next;
1676 else
1677 idev->mc_tomb = pmc_next;
1678 in6_dev_put(pmc->idev);
1679 kfree(pmc);
1680 } else
1681 pmc_prev = pmc;
1682 }
6457d26b 1683 spin_unlock(&idev->mc_lock);
1da177e4
LT		 1684
1685 /* change recs */
1686 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1687 spin_lock_bh(&pmc->mca_lock);
1688 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1689 type = MLD2_BLOCK_OLD_SOURCES;
1690 dtype = MLD2_ALLOW_NEW_SOURCES;
1691 } else {
1692 type = MLD2_ALLOW_NEW_SOURCES;
1693 dtype = MLD2_BLOCK_OLD_SOURCES;
1694 }
1695 skb = add_grec(skb, pmc, type, 0, 0);
1696 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1697
1698 /* filter mode changes */
1699 if (pmc->mca_crcount) {
1da177e4
LT		 1700 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1701 type = MLD2_CHANGE_TO_EXCLUDE;
1702 else
1703 type = MLD2_CHANGE_TO_INCLUDE;
1704 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1705 pmc->mca_crcount--;
1da177e4
LT		 1706 }
1707 spin_unlock_bh(&pmc->mca_lock);
1708 }
1709 read_unlock_bh(&idev->lock);
1710 if (!skb)
1711 return;
1712 (void) mld_sendpack(skb);
1713}
1714
1715static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1716{
c346dca1 1717 struct net *net = dev_net(dev);
b8ad0cbc 1718 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1719 struct inet6_dev *idev;
1ab1457c 1720 struct sk_buff *skb;
6e7cb837 1721 struct mld_msg *hdr;
d7aabf22 1722 const struct in6_addr *snd_addr, *saddr;
1da177e4 1723 struct in6_addr addr_buf;
1da177e4
LT		 1724 int err, len, payload_len, full_len;
1725 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1726 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1727 IPV6_TLV_PADN, 0 };
41927178 1728 struct flowi fl;
adf30907 1729 struct dst_entry *dst;
1da177e4 1730
f3ee4010
YH		 1731 if (type == ICMPV6_MGM_REDUCTION)
1732 snd_addr = &in6addr_linklocal_allrouters;
1733 else
1734 snd_addr = addr;
1da177e4
LT		 1735
1736 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1737 payload_len = len + sizeof(ra);
1738 full_len = sizeof(struct ipv6hdr) + payload_len;
1739
edf391ff
NH		 1740 rcu_read_lock();
1741 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1742 IPSTATS_MIB_OUT, full_len);
1743 rcu_read_unlock();
1744
f5184d26 1745 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1da177e4
LT		 1746
1747 if (skb == NULL) {
a11d206d 1748 rcu_read_lock();
3bd653c8 1749 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 1750 IPSTATS_MIB_OUTDISCARDS);
1751 rcu_read_unlock();
1da177e4
LT		 1752 return;
1753 }
1754
1755 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1756
95c385b4 1757 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1758 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1759 * use unspecified address as the source address
1da177e4
LT		 1760 * when a valid link-local address is not available.
1761 */
d7aabf22
YH		 1762 saddr = &in6addr_any;
1763 } else
1764 saddr = &addr_buf;
1da177e4 1765
d7aabf22 1766 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT		 1767
1768 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1769
6e7cb837
YH		 1770 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1771 memset(hdr, 0, sizeof(struct mld_msg));
1772 hdr->mld_type = type;
1773 ipv6_addr_copy(&hdr->mld_mca, addr);
1da177e4 1774
6e7cb837
YH		 1775 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1776 IPPROTO_ICMPV6,
1777 csum_partial(hdr, len, 0));
1da177e4
LT		 1778
1779 idev = in6_dev_get(skb->dev);
1780
adf30907
ED		 1781 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1782 if (!dst) {
41927178
YH		 1783 err = -ENOMEM;
1784 goto err_out;
1785 }
1786
b8ad0cbc 1787 icmpv6_flow_init(sk, &fl, type,
41927178
YH		 1788 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1789 skb->dev->ifindex);
1790
adf30907 1791 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
41927178
YH		 1792 if (err)
1793 goto err_out;
1794
adf30907 1795 skb_dst_set(skb, dst);
b2e0b385 1796 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1797 dst_output);
1798out:
1da177e4 1799 if (!err) {
5c5d244b 1800 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 1801 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1802 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1da177e4 1803 } else
3bd653c8 1804 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1805
1806 if (likely(idev != NULL))
1807 in6_dev_put(idev);
1808 return;
41927178
YH		 1809
1810err_out:
1811 kfree_skb(skb);
1812 goto out;
1da177e4
LT		 1813}
1814
1815static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1816 struct in6_addr *psfsrc)
1817{
1818 struct ip6_sf_list *psf, *psf_prev;
1819 int rv = 0;
1820
1821 psf_prev = NULL;
1822 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1823 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1824 break;
1825 psf_prev = psf;
1826 }
1827 if (!psf || psf->sf_count[sfmode] == 0) {
1828 /* source filter not found, or count wrong => bug */
1829 return -ESRCH;
1830 }
1831 psf->sf_count[sfmode]--;
1832 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1833 struct inet6_dev *idev = pmc->idev;
1834
1835 /* no more filters for this source */
1836 if (psf_prev)
1837 psf_prev->sf_next = psf->sf_next;
1838 else
1839 pmc->mca_sources = psf->sf_next;
1840 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1841 !MLD_V1_SEEN(idev)) {
1842 psf->sf_crcount = idev->mc_qrv;
1843 psf->sf_next = pmc->mca_tomb;
1844 pmc->mca_tomb = psf;
1845 rv = 1;
1846 } else
1847 kfree(psf);
1848 }
1849 return rv;
1850}
1851
1852static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1853 int sfmode, int sfcount, struct in6_addr *psfsrc,
1854 int delta)
1855{
1856 struct ifmcaddr6 *pmc;
1857 int changerec = 0;
1858 int i, err;
1859
1860 if (!idev)
1861 return -ENODEV;
1862 read_lock_bh(&idev->lock);
1863 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1864 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1865 break;
1866 }
1867 if (!pmc) {
1868 /* MCA not found?? bug */
1869 read_unlock_bh(&idev->lock);
1870 return -ESRCH;
1871 }
1872 spin_lock_bh(&pmc->mca_lock);
1873 sf_markstate(pmc);
1874 if (!delta) {
1875 if (!pmc->mca_sfcount[sfmode]) {
1876 spin_unlock_bh(&pmc->mca_lock);
1877 read_unlock_bh(&idev->lock);
1878 return -EINVAL;
1879 }
1880 pmc->mca_sfcount[sfmode]--;
1881 }
1882 err = 0;
1883 for (i=0; i<sfcount; i++) {
1884 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1885
1886 changerec |= rv > 0;
1887 if (!err && rv < 0)
1888 err = rv;
1889 }
1890 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1891 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1892 pmc->mca_sfcount[MCAST_INCLUDE]) {
1893 struct ip6_sf_list *psf;
1894
1895 /* filter mode change */
1896 pmc->mca_sfmode = MCAST_INCLUDE;
1897 pmc->mca_crcount = idev->mc_qrv;
1898 idev->mc_ifc_count = pmc->mca_crcount;
1899 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1900 psf->sf_crcount = 0;
1901 mld_ifc_event(pmc->idev);
1902 } else if (sf_setstate(pmc) || changerec)
1903 mld_ifc_event(pmc->idev);
1904 spin_unlock_bh(&pmc->mca_lock);
1905 read_unlock_bh(&idev->lock);
1906 return err;
1907}
1908
1909/*
1910 * Add multicast single-source filter to the interface list
1911 */
1912static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1913 struct in6_addr *psfsrc, int delta)
1914{
1915 struct ip6_sf_list *psf, *psf_prev;
1916
1917 psf_prev = NULL;
1918 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1919 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1920 break;
1921 psf_prev = psf;
1922 }
1923 if (!psf) {
0c600eda 1924 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1925 if (!psf)
1926 return -ENOBUFS;
0c600eda 1927
1da177e4
LT		 1928 psf->sf_addr = *psfsrc;
1929 if (psf_prev) {
1930 psf_prev->sf_next = psf;
1931 } else
1932 pmc->mca_sources = psf;
1933 }
1934 psf->sf_count[sfmode]++;
1935 return 0;
1936}
1937
1938static void sf_markstate(struct ifmcaddr6 *pmc)
1939{
1940 struct ip6_sf_list *psf;
1941 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1942
1943 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1944 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1945 psf->sf_oldin = mca_xcount ==
1946 psf->sf_count[MCAST_EXCLUDE] &&
1947 !psf->sf_count[MCAST_INCLUDE];
1948 } else
1949 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1950}
1951
1952static int sf_setstate(struct ifmcaddr6 *pmc)
1953{
7add2a43 1954 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 1955 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1956 int qrv = pmc->idev->mc_qrv;
1957 int new_in, rv;
1958
1959 rv = 0;
1960 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1961 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1962 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1963 !psf->sf_count[MCAST_INCLUDE];
1964 } else
1965 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 1966 if (new_in) {
1967 if (!psf->sf_oldin) {
e80e28b6 1968 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 1969
1970 for (dpsf=pmc->mca_tomb; dpsf;
1971 dpsf=dpsf->sf_next) {
1972 if (ipv6_addr_equal(&dpsf->sf_addr,
1973 &psf->sf_addr))
1974 break;
1975 prev = dpsf;
1976 }
1977 if (dpsf) {
1978 if (prev)
1979 prev->sf_next = dpsf->sf_next;
1980 else
1981 pmc->mca_tomb = dpsf->sf_next;
1982 kfree(dpsf);
1983 }
1984 psf->sf_crcount = qrv;
1985 rv++;
1986 }
1987 } else if (psf->sf_oldin) {
1988 psf->sf_crcount = 0;
1989 /*
1990 * add or update "delete" records if an active filter
1991 * is now inactive
1992 */
1993 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1994 if (ipv6_addr_equal(&dpsf->sf_addr,
1995 &psf->sf_addr))
1996 break;
1997 if (!dpsf) {
1998 dpsf = (struct ip6_sf_list *)
1999 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2000 if (!dpsf)
2001 continue;
2002 *dpsf = *psf;
2003 /* pmc->mca_lock held by callers */
2004 dpsf->sf_next = pmc->mca_tomb;
2005 pmc->mca_tomb = dpsf;
2006 }
2007 dpsf->sf_crcount = qrv;
1da177e4
LT		 2008 rv++;
2009 }
2010 }
2011 return rv;
2012}
2013
2014/*
2015 * Add multicast source filter list to the interface list
2016 */
2017static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2018 int sfmode, int sfcount, struct in6_addr *psfsrc,
2019 int delta)
2020{
2021 struct ifmcaddr6 *pmc;
2022 int isexclude;
2023 int i, err;
2024
2025 if (!idev)
2026 return -ENODEV;
2027 read_lock_bh(&idev->lock);
2028 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2029 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2030 break;
2031 }
2032 if (!pmc) {
2033 /* MCA not found?? bug */
2034 read_unlock_bh(&idev->lock);
2035 return -ESRCH;
2036 }
2037 spin_lock_bh(&pmc->mca_lock);
2038
2039 sf_markstate(pmc);
2040 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2041 if (!delta)
2042 pmc->mca_sfcount[sfmode]++;
2043 err = 0;
2044 for (i=0; i<sfcount; i++) {
2045 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2046 if (err)
2047 break;
2048 }
2049 if (err) {
2050 int j;
2051
2052 if (!delta)
2053 pmc->mca_sfcount[sfmode]--;
2054 for (j=0; j<i; j++)
2055 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2056 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2057 struct ip6_sf_list *psf;
2058
2059 /* filter mode change */
2060 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2061 pmc->mca_sfmode = MCAST_EXCLUDE;
2062 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2063 pmc->mca_sfmode = MCAST_INCLUDE;
2064 /* else no filters; keep old mode for reports */
2065
2066 pmc->mca_crcount = idev->mc_qrv;
2067 idev->mc_ifc_count = pmc->mca_crcount;
2068 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2069 psf->sf_crcount = 0;
2070 mld_ifc_event(idev);
2071 } else if (sf_setstate(pmc))
2072 mld_ifc_event(idev);
2073 spin_unlock_bh(&pmc->mca_lock);
2074 read_unlock_bh(&idev->lock);
2075 return err;
2076}
2077
2078static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2079{
2080 struct ip6_sf_list *psf, *nextpsf;
2081
2082 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2083 nextpsf = psf->sf_next;
2084 kfree(psf);
2085 }
2086 pmc->mca_tomb = NULL;
2087 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2088 nextpsf = psf->sf_next;
2089 kfree(psf);
2090 }
2091 pmc->mca_sources = NULL;
2092 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2093 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2094 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2095}
2096
2097
2098static void igmp6_join_group(struct ifmcaddr6 *ma)
2099{
2100 unsigned long delay;
2101
2102 if (ma->mca_flags & MAF_NOREPORT)
2103 return;
2104
2105 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2106
2107 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2108
2109 spin_lock_bh(&ma->mca_lock);
2110 if (del_timer(&ma->mca_timer)) {
2111 atomic_dec(&ma->mca_refcnt);
2112 delay = ma->mca_timer.expires - jiffies;
2113 }
2114
2115 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2116 atomic_inc(&ma->mca_refcnt);
2117 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2118 spin_unlock_bh(&ma->mca_lock);
2119}
2120
2121static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2122 struct inet6_dev *idev)
2123{
2124 int err;
2125
5ab4a6c8
DS		 2126 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2127 * so no other readers or writers of iml or its sflist
2128 */
cfcabdcc 2129 if (!iml->sflist) {
1da177e4
LT		 2130 /* any-source empty exclude case */
2131 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2132 }
2133 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2134 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2135 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2136 iml->sflist = NULL;
2137 return err;
2138}
2139
2140static void igmp6_leave_group(struct ifmcaddr6 *ma)
2141{
2142 if (MLD_V1_SEEN(ma->idev)) {
2143 if (ma->mca_flags & MAF_LAST_REPORTER)
2144 igmp6_send(&ma->mca_addr, ma->idev->dev,
2145 ICMPV6_MGM_REDUCTION);
2146 } else {
2147 mld_add_delrec(ma->idev, ma);
2148 mld_ifc_event(ma->idev);
2149 }
2150}
2151
2152static void mld_gq_timer_expire(unsigned long data)
2153{
2154 struct inet6_dev *idev = (struct inet6_dev *)data;
2155
2156 idev->mc_gq_running = 0;
2157 mld_send_report(idev, NULL);
2158 __in6_dev_put(idev);
2159}
2160
2161static void mld_ifc_timer_expire(unsigned long data)
2162{
2163 struct inet6_dev *idev = (struct inet6_dev *)data;
2164
2165 mld_send_cr(idev);
2166 if (idev->mc_ifc_count) {
2167 idev->mc_ifc_count--;
2168 if (idev->mc_ifc_count)
2169 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2170 }
2171 __in6_dev_put(idev);
2172}
2173
2174static void mld_ifc_event(struct inet6_dev *idev)
2175{
2176 if (MLD_V1_SEEN(idev))
2177 return;
2178 idev->mc_ifc_count = idev->mc_qrv;
2179 mld_ifc_start_timer(idev, 1);
2180}
2181
2182
2183static void igmp6_timer_handler(unsigned long data)
2184{
2185 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2186
2187 if (MLD_V1_SEEN(ma->idev))
2188 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2189 else
2190 mld_send_report(ma->idev, ma);
2191
2192 spin_lock(&ma->mca_lock);
2193 ma->mca_flags |= MAF_LAST_REPORTER;
2194 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2195 spin_unlock(&ma->mca_lock);
2196 ma_put(ma);
2197}
2198
75c78500
MS		 2199/* Device changing type */
2200
2201void ipv6_mc_unmap(struct inet6_dev *idev)
2202{
2203 struct ifmcaddr6 *i;
2204
2205 /* Install multicast list, except for all-nodes (already installed) */
2206
2207 read_lock_bh(&idev->lock);
2208 for (i = idev->mc_list; i; i = i->next)
2209 igmp6_group_dropped(i);
2210 read_unlock_bh(&idev->lock);
2211}
2212
2213void ipv6_mc_remap(struct inet6_dev *idev)
2214{
2215 ipv6_mc_up(idev);
2216}
2217
1da177e4
LT		 2218/* Device going down */
2219
2220void ipv6_mc_down(struct inet6_dev *idev)
2221{
2222 struct ifmcaddr6 *i;
2223
2224 /* Withdraw multicast list */
2225
2226 read_lock_bh(&idev->lock);
2227 idev->mc_ifc_count = 0;
2228 if (del_timer(&idev->mc_ifc_timer))
2229 __in6_dev_put(idev);
2230 idev->mc_gq_running = 0;
2231 if (del_timer(&idev->mc_gq_timer))
2232 __in6_dev_put(idev);
2233
2234 for (i = idev->mc_list; i; i=i->next)
2235 igmp6_group_dropped(i);
2236 read_unlock_bh(&idev->lock);
2237
2238 mld_clear_delrec(idev);
2239}
2240
2241
2242/* Device going up */
2243
2244void ipv6_mc_up(struct inet6_dev *idev)
2245{
2246 struct ifmcaddr6 *i;
2247
2248 /* Install multicast list, except for all-nodes (already installed) */
2249
2250 read_lock_bh(&idev->lock);
2251 for (i = idev->mc_list; i; i=i->next)
2252 igmp6_group_added(i);
2253 read_unlock_bh(&idev->lock);
2254}
2255
2256/* IPv6 device initialization. */
2257
2258void ipv6_mc_init_dev(struct inet6_dev *idev)
2259{
1da177e4 2260 write_lock_bh(&idev->lock);
6457d26b 2261 spin_lock_init(&idev->mc_lock);
1da177e4 2262 idev->mc_gq_running = 0;
b24b8a24
PE		 2263 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2264 (unsigned long)idev);
1da177e4
LT		 2265 idev->mc_tomb = NULL;
2266 idev->mc_ifc_count = 0;
b24b8a24
PE		 2267 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2268 (unsigned long)idev);
1da177e4
LT		 2269 idev->mc_qrv = MLD_QRV_DEFAULT;
2270 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2271 idev->mc_v1_seen = 0;
2272 write_unlock_bh(&idev->lock);
1da177e4
LT		 2273}
2274
2275/*
2276 * Device is about to be destroyed: clean up.
2277 */
2278
2279void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2280{
2281 struct ifmcaddr6 *i;
1da177e4
LT		 2282
2283 /* Deactivate timers */
2284 ipv6_mc_down(idev);
2285
2286 /* Delete all-nodes address. */
1da177e4
LT		 2287 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2288 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2289 * fail.
2290 */
f3ee4010 2291 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2292
f3ee4010
YH		 2293 if (idev->cnf.forwarding)
2294 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2295
2296 write_lock_bh(&idev->lock);
2297 while ((i = idev->mc_list) != NULL) {
2298 idev->mc_list = i->next;
2299 write_unlock_bh(&idev->lock);
2300
2301 igmp6_group_dropped(i);
2302 ma_put(i);
2303
2304 write_lock_bh(&idev->lock);
2305 }
2306 write_unlock_bh(&idev->lock);
2307}
2308
2309#ifdef CONFIG_PROC_FS
2310struct igmp6_mc_iter_state {
b8ad0cbc 2311 struct seq_net_private p;
1da177e4
LT		 2312 struct net_device *dev;
2313 struct inet6_dev *idev;
2314};
2315
2316#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2317
2318static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2319{
2320 struct ifmcaddr6 *im = NULL;
2321 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2322 struct net *net = seq_file_net(seq);
1da177e4 2323
7562f876 2324 state->idev = NULL;
ce81b76a 2325 for_each_netdev_rcu(net, state->dev) {
1da177e4 2326 struct inet6_dev *idev;
ce81b76a 2327 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2328 if (!idev)
2329 continue;
2330 read_lock_bh(&idev->lock);
2331 im = idev->mc_list;
2332 if (im) {
2333 state->idev = idev;
2334 break;
2335 }
2336 read_unlock_bh(&idev->lock);
1da177e4
LT		 2337 }
2338 return im;
2339}
2340
2341static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2342{
2343 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2344
2345 im = im->next;
2346 while (!im) {
ce81b76a 2347 if (likely(state->idev != NULL))
1da177e4 2348 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2349
2350 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2351 if (!state->dev) {
2352 state->idev = NULL;
2353 break;
2354 }
ce81b76a 2355 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2356 if (!state->idev)
2357 continue;
2358 read_lock_bh(&state->idev->lock);
2359 im = state->idev->mc_list;
2360 }
2361 return im;
2362}
2363
2364static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2365{
2366 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2367 if (im)
2368 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2369 --pos;
2370 return pos ? NULL : im;
2371}
2372
2373static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2374 __acquires(RCU)
1da177e4 2375{
ce81b76a 2376 rcu_read_lock();
1da177e4
LT		 2377 return igmp6_mc_get_idx(seq, *pos);
2378}
2379
2380static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2381{
ce81b76a
ED		 2382 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2383
1da177e4
LT		 2384 ++*pos;
2385 return im;
2386}
2387
2388static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2389 __releases(RCU)
1da177e4
LT		 2390{
2391 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2392
1da177e4
LT		 2393 if (likely(state->idev != NULL)) {
2394 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2395 state->idev = NULL;
2396 }
2397 state->dev = NULL;
ce81b76a 2398 rcu_read_unlock();
1da177e4
LT		 2399}
2400
2401static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2402{
2403 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2404 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2405
2406 seq_printf(seq,
4b7a4274 2407 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2408 state->dev->ifindex, state->dev->name,
b071195d 2409 &im->mca_addr,
1da177e4
LT		 2410 im->mca_users, im->mca_flags,
2411 (im->mca_flags&MAF_TIMER_RUNNING) ?
2412 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2413 return 0;
2414}
2415
56b3d975 2416static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2417 .start = igmp6_mc_seq_start,
2418 .next = igmp6_mc_seq_next,
2419 .stop = igmp6_mc_seq_stop,
2420 .show = igmp6_mc_seq_show,
2421};
2422
2423static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2424{
b8ad0cbc
DL		 2425 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2426 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2427}
2428
9a32144e 2429static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2430 .owner = THIS_MODULE,
2431 .open = igmp6_mc_seq_open,
2432 .read = seq_read,
2433 .llseek = seq_lseek,
b8ad0cbc 2434 .release = seq_release_net,
1da177e4
LT		 2435};
2436
2437struct igmp6_mcf_iter_state {
b8ad0cbc 2438 struct seq_net_private p;
1da177e4
LT		 2439 struct net_device *dev;
2440 struct inet6_dev *idev;
2441 struct ifmcaddr6 *im;
2442};
2443
2444#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2445
2446static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2447{
2448 struct ip6_sf_list *psf = NULL;
2449 struct ifmcaddr6 *im = NULL;
2450 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2451 struct net *net = seq_file_net(seq);
1da177e4 2452
7562f876
PE		 2453 state->idev = NULL;
2454 state->im = NULL;
ce81b76a 2455 for_each_netdev_rcu(net, state->dev) {
1da177e4 2456 struct inet6_dev *idev;
ce81b76a 2457 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2458 if (unlikely(idev == NULL))
2459 continue;
2460 read_lock_bh(&idev->lock);
2461 im = idev->mc_list;
2462 if (likely(im != NULL)) {
2463 spin_lock_bh(&im->mca_lock);
2464 psf = im->mca_sources;
2465 if (likely(psf != NULL)) {
2466 state->im = im;
2467 state->idev = idev;
2468 break;
2469 }
2470 spin_unlock_bh(&im->mca_lock);
2471 }
2472 read_unlock_bh(&idev->lock);
1da177e4
LT		 2473 }
2474 return psf;
2475}
2476
2477static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2478{
2479 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2480
2481 psf = psf->sf_next;
2482 while (!psf) {
2483 spin_unlock_bh(&state->im->mca_lock);
2484 state->im = state->im->next;
2485 while (!state->im) {
ce81b76a 2486 if (likely(state->idev != NULL))
1da177e4 2487 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2488
2489 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2490 if (!state->dev) {
2491 state->idev = NULL;
2492 goto out;
2493 }
ce81b76a 2494 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2495 if (!state->idev)
2496 continue;
2497 read_lock_bh(&state->idev->lock);
2498 state->im = state->idev->mc_list;
2499 }
2500 if (!state->im)
2501 break;
2502 spin_lock_bh(&state->im->mca_lock);
2503 psf = state->im->mca_sources;
2504 }
2505out:
2506 return psf;
2507}
2508
2509static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2510{
2511 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2512 if (psf)
2513 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2514 --pos;
2515 return pos ? NULL : psf;
2516}
2517
2518static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2519 __acquires(RCU)
1da177e4 2520{
ce81b76a 2521 rcu_read_lock();
1da177e4
LT		 2522 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2523}
2524
2525static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2526{
2527 struct ip6_sf_list *psf;
2528 if (v == SEQ_START_TOKEN)
2529 psf = igmp6_mcf_get_first(seq);
2530 else
2531 psf = igmp6_mcf_get_next(seq, v);
2532 ++*pos;
2533 return psf;
2534}
2535
2536static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2537 __releases(RCU)
1da177e4
LT		 2538{
2539 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2540 if (likely(state->im != NULL)) {
2541 spin_unlock_bh(&state->im->mca_lock);
2542 state->im = NULL;
2543 }
2544 if (likely(state->idev != NULL)) {
2545 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2546 state->idev = NULL;
2547 }
2548 state->dev = NULL;
ce81b76a 2549 rcu_read_unlock();
1da177e4
LT		 2550}
2551
2552static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2553{
2554 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2555 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2556
2557 if (v == SEQ_START_TOKEN) {
1ab1457c 2558 seq_printf(seq,
1da177e4 2559 "%3s %6s "
9343e79a 2560 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2561 "Device", "Multicast Address",
2562 "Source Address", "INC", "EXC");
2563 } else {
2564 seq_printf(seq,
4b7a4274 2565 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2566 state->dev->ifindex, state->dev->name,
b071195d
HH		 2567 &state->im->mca_addr,
2568 &psf->sf_addr,
1da177e4
LT		 2569 psf->sf_count[MCAST_INCLUDE],
2570 psf->sf_count[MCAST_EXCLUDE]);
2571 }
2572 return 0;
2573}
2574
56b3d975 2575static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2576 .start = igmp6_mcf_seq_start,
2577 .next = igmp6_mcf_seq_next,
2578 .stop = igmp6_mcf_seq_stop,
2579 .show = igmp6_mcf_seq_show,
2580};
2581
2582static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2583{
b8ad0cbc
DL		 2584 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2585 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2586}
2587
9a32144e 2588static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2589 .owner = THIS_MODULE,
2590 .open = igmp6_mcf_seq_open,
2591 .read = seq_read,
2592 .llseek = seq_lseek,
b8ad0cbc 2593 .release = seq_release_net,
1da177e4 2594};
ea82edf7 2595
2c8c1e72 2596static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 2597{
2598 int err;
2599
2600 err = -ENOMEM;
2601 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2602 goto out;
2603 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2604 &igmp6_mcf_seq_fops))
2605 goto out_proc_net_igmp6;
2606
2607 err = 0;
2608out:
2609 return err;
2610
2611out_proc_net_igmp6:
2612 proc_net_remove(net, "igmp6");
2613 goto out;
2614}
2615
2c8c1e72 2616static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7
DL		 2617{
2618 proc_net_remove(net, "mcfilter6");
2619 proc_net_remove(net, "igmp6");
2620}
2621#else
2c8c1e72 2622static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 2623{
2624 return 0;
2625}
2c8c1e72 2626static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2627{
ea82edf7 2628}
1da177e4
LT		 2629#endif
2630
2c8c1e72 2631static int __net_init igmp6_net_init(struct net *net)
1da177e4 2632{
1da177e4
LT		 2633 int err;
2634
1ed8516f
DL		 2635 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2636 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 2637 if (err < 0) {
2638 printk(KERN_ERR
2639 "Failed to initialize the IGMP6 control socket (err %d).\n",
2640 err);
b8ad0cbc 2641 goto out;
1da177e4
LT		 2642 }
2643
1ed8516f 2644 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2645
ea82edf7
DL		 2646 err = igmp6_proc_init(net);
2647 if (err)
b8ad0cbc 2648 goto out_sock_create;
b8ad0cbc
DL		 2649out:
2650 return err;
2651
2652out_sock_create:
1ed8516f 2653 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2654 goto out;
1da177e4
LT		 2655}
2656
2c8c1e72 2657static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2658{
1ed8516f 2659 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2660 igmp6_proc_exit(net);
1da177e4 2661}
b8ad0cbc
DL		 2662
2663static struct pernet_operations igmp6_net_ops = {
2664 .init = igmp6_net_init,
2665 .exit = igmp6_net_exit,
2666};
2667
2668int __init igmp6_init(void)
2669{
2670 return register_pernet_subsys(&igmp6_net_ops);
2671}
2672
2673void igmp6_cleanup(void)
2674{
2675 unregister_pernet_subsys(&igmp6_net_ops);
2676}
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