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[IPV6]: Make address arguments const.
[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
LT		 7 *
8 * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
9 *
1ab1457c 10 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
1da177e4
LT		 11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18/* Changes:
19 *
20 * yoshfuji : fix format of router-alert option
21 * YOSHIFUJI Hideaki @USAGI:
22 * Fixed source address for MLD message based on
23 * <draft-ietf-magma-mld-source-05.txt>.
24 * YOSHIFUJI Hideaki @USAGI:
25 * - Ignore Queries for invalid addresses.
26 * - MLD for link-local addresses.
27 * David L Stevens <dlstevens@us.ibm.com>:
28 * - MLDv2 support
29 */
30
1da177e4
LT		 31#include <linux/module.h>
32#include <linux/errno.h>
33#include <linux/types.h>
34#include <linux/string.h>
35#include <linux/socket.h>
36#include <linux/sockios.h>
37#include <linux/jiffies.h>
38#include <linux/times.h>
39#include <linux/net.h>
40#include <linux/in.h>
41#include <linux/in6.h>
42#include <linux/netdevice.h>
43#include <linux/if_arp.h>
44#include <linux/route.h>
45#include <linux/init.h>
46#include <linux/proc_fs.h>
47#include <linux/seq_file.h>
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
75/*
76 * These header formats should be in a separate include file, but icmpv6.h
77 * doesn't have in6_addr defined in all cases, there is no __u128, and no
78 * other files reference these.
79 *
80 * +-DLS 4/14/03
81 */
82
83/* Multicast Listener Discovery version 2 headers */
84
85struct mld2_grec {
86 __u8 grec_type;
87 __u8 grec_auxwords;
8a74ff77 88 __be16 grec_nsrcs;
1da177e4
LT		 89 struct in6_addr grec_mca;
90 struct in6_addr grec_src[0];
91};
92
93struct mld2_report {
94 __u8 type;
95 __u8 resv1;
868c86bc 96 __sum16 csum;
8a74ff77
AV		 97 __be16 resv2;
98 __be16 ngrec;
1da177e4
LT		 99 struct mld2_grec grec[0];
100};
101
102struct mld2_query {
103 __u8 type;
104 __u8 code;
868c86bc 105 __sum16 csum;
8a74ff77
AV		 106 __be16 mrc;
107 __be16 resv1;
1da177e4
LT		 108 struct in6_addr mca;
109#if defined(__LITTLE_ENDIAN_BITFIELD)
110 __u8 qrv:3,
111 suppress:1,
112 resv2:4;
113#elif defined(__BIG_ENDIAN_BITFIELD)
114 __u8 resv2:4,
115 suppress:1,
116 qrv:3;
117#else
118#error "Please fix <asm/byteorder.h>"
119#endif
120 __u8 qqic;
8a74ff77 121 __be16 nsrcs;
1da177e4
LT		 122 struct in6_addr srcs[0];
123};
124
125static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
126
127/* Big mc list lock for all the sockets */
128static DEFINE_RWLOCK(ipv6_sk_mc_lock);
129
1da177e4
LT		 130static void igmp6_join_group(struct ifmcaddr6 *ma);
131static void igmp6_leave_group(struct ifmcaddr6 *ma);
132static void igmp6_timer_handler(unsigned long data);
133
134static void mld_gq_timer_expire(unsigned long data);
135static void mld_ifc_timer_expire(unsigned long data);
136static void mld_ifc_event(struct inet6_dev *idev);
137static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
138static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
139static void mld_clear_delrec(struct inet6_dev *idev);
140static int sf_setstate(struct ifmcaddr6 *pmc);
141static void sf_markstate(struct ifmcaddr6 *pmc);
142static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
143static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
144 int sfmode, int sfcount, struct in6_addr *psfsrc,
145 int delta);
146static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
147 int sfmode, int sfcount, struct in6_addr *psfsrc,
148 int delta);
149static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
150 struct inet6_dev *idev);
151
152
153#define IGMP6_UNSOLICITED_IVAL (10*HZ)
154#define MLD_QRV_DEFAULT 2
155
156#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
157 (idev)->cnf.force_mld_version == 1 || \
158 ((idev)->mc_v1_seen && \
159 time_before(jiffies, (idev)->mc_v1_seen)))
160
161#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
162#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
163 ((value) < (thresh) ? (value) : \
f12baeab 164 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
1da177e4
LT		 165 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
166
167#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
168#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
169
6f4353d8 170#define IPV6_MLD_MAX_MSF 64
1da177e4 171
ab32ea5d 172int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 173
174/*
175 * socket join on multicast group
176 */
177
9acd9f3a 178int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 179{
180 struct net_device *dev = NULL;
181 struct ipv6_mc_socklist *mc_lst;
182 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 183 struct net *net = sock_net(sk);
1da177e4
LT		 184 int err;
185
186 if (!ipv6_addr_is_multicast(addr))
187 return -EINVAL;
188
c9e3e8b6
DS		 189 read_lock_bh(&ipv6_sk_mc_lock);
190 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
191 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
192 ipv6_addr_equal(&mc_lst->addr, addr)) {
193 read_unlock_bh(&ipv6_sk_mc_lock);
194 return -EADDRINUSE;
195 }
196 }
197 read_unlock_bh(&ipv6_sk_mc_lock);
198
1da177e4
LT		 199 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
200
201 if (mc_lst == NULL)
202 return -ENOMEM;
203
204 mc_lst->next = NULL;
205 ipv6_addr_copy(&mc_lst->addr, addr);
206
207 if (ifindex == 0) {
208 struct rt6_info *rt;
b8ad0cbc 209 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4
LT		 210 if (rt) {
211 dev = rt->rt6i_dev;
212 dev_hold(dev);
213 dst_release(&rt->u.dst);
214 }
215 } else
b8ad0cbc 216 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 217
218 if (dev == NULL) {
219 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
220 return -ENODEV;
221 }
222
223 mc_lst->ifindex = dev->ifindex;
224 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 225 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 226 mc_lst->sflist = NULL;
227
228 /*
229 * now add/increase the group membership on the device
230 */
231
232 err = ipv6_dev_mc_inc(dev, addr);
233
234 if (err) {
235 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
236 dev_put(dev);
237 return err;
238 }
239
240 write_lock_bh(&ipv6_sk_mc_lock);
241 mc_lst->next = np->ipv6_mc_list;
242 np->ipv6_mc_list = mc_lst;
243 write_unlock_bh(&ipv6_sk_mc_lock);
244
245 dev_put(dev);
246
247 return 0;
248}
249
250/*
251 * socket leave on multicast group
252 */
9acd9f3a 253int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 254{
255 struct ipv6_pinfo *np = inet6_sk(sk);
256 struct ipv6_mc_socklist *mc_lst, **lnk;
3b1e0a65 257 struct net *net = sock_net(sk);
1da177e4
LT		 258
259 write_lock_bh(&ipv6_sk_mc_lock);
260 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
261 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
262 ipv6_addr_equal(&mc_lst->addr, addr)) {
263 struct net_device *dev;
264
265 *lnk = mc_lst->next;
266 write_unlock_bh(&ipv6_sk_mc_lock);
267
b8ad0cbc
DL		 268 dev = dev_get_by_index(net, mc_lst->ifindex);
269 if (dev != NULL) {
1da177e4
LT		 270 struct inet6_dev *idev = in6_dev_get(dev);
271
acd6e00b 272 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 273 if (idev) {
1da177e4
LT		 274 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
275 in6_dev_put(idev);
276 }
277 dev_put(dev);
acd6e00b
DS		 278 } else
279 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 280 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
281 return 0;
282 }
283 }
284 write_unlock_bh(&ipv6_sk_mc_lock);
285
9951f036 286 return -EADDRNOTAVAIL;
1da177e4
LT		 287}
288
b8ad0cbc
DL		 289static struct inet6_dev *ip6_mc_find_dev(struct net *net,
290 struct in6_addr *group,
291 int ifindex)
1da177e4
LT		 292{
293 struct net_device *dev = NULL;
294 struct inet6_dev *idev = NULL;
295
296 if (ifindex == 0) {
297 struct rt6_info *rt;
298
b8ad0cbc 299 rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4
LT		 300 if (rt) {
301 dev = rt->rt6i_dev;
302 dev_hold(dev);
303 dst_release(&rt->u.dst);
304 }
305 } else
b8ad0cbc 306 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 307
308 if (!dev)
309 return NULL;
310 idev = in6_dev_get(dev);
311 if (!idev) {
312 dev_put(dev);
313 return NULL;
314 }
315 read_lock_bh(&idev->lock);
316 if (idev->dead) {
317 read_unlock_bh(&idev->lock);
318 in6_dev_put(idev);
319 dev_put(dev);
320 return NULL;
321 }
322 return idev;
323}
324
325void ipv6_sock_mc_close(struct sock *sk)
326{
327 struct ipv6_pinfo *np = inet6_sk(sk);
328 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 329 struct net *net = sock_net(sk);
1da177e4
LT		 330
331 write_lock_bh(&ipv6_sk_mc_lock);
332 while ((mc_lst = np->ipv6_mc_list) != NULL) {
333 struct net_device *dev;
334
335 np->ipv6_mc_list = mc_lst->next;
336 write_unlock_bh(&ipv6_sk_mc_lock);
337
b8ad0cbc 338 dev = dev_get_by_index(net, mc_lst->ifindex);
1da177e4
LT		 339 if (dev) {
340 struct inet6_dev *idev = in6_dev_get(dev);
341
acd6e00b 342 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 343 if (idev) {
1da177e4
LT		 344 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
345 in6_dev_put(idev);
346 }
347 dev_put(dev);
acd6e00b
DS		 348 } else
349 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 350
351 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
352
353 write_lock_bh(&ipv6_sk_mc_lock);
354 }
355 write_unlock_bh(&ipv6_sk_mc_lock);
356}
357
358int ip6_mc_source(int add, int omode, struct sock *sk,
359 struct group_source_req *pgsr)
360{
361 struct in6_addr *source, *group;
362 struct ipv6_mc_socklist *pmc;
363 struct net_device *dev;
364 struct inet6_dev *idev;
365 struct ipv6_pinfo *inet6 = inet6_sk(sk);
366 struct ip6_sf_socklist *psl;
3b1e0a65 367 struct net *net = sock_net(sk);
1da177e4 368 int i, j, rv;
c9e3e8b6 369 int leavegroup = 0;
5ab4a6c8 370 int pmclocked = 0;
1da177e4
LT		 371 int err;
372
373 if (pgsr->gsr_group.ss_family != AF_INET6 ||
374 pgsr->gsr_source.ss_family != AF_INET6)
375 return -EINVAL;
376
377 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
378 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
379
380 if (!ipv6_addr_is_multicast(group))
381 return -EINVAL;
382
b8ad0cbc 383 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
1da177e4
LT		 384 if (!idev)
385 return -ENODEV;
386 dev = idev->dev;
387
388 err = -EADDRNOTAVAIL;
389
c9e3e8b6 390 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 391 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
392 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
393 continue;
394 if (ipv6_addr_equal(&pmc->addr, group))
395 break;
396 }
917f2f10
DS		 397 if (!pmc) { /* must have a prior join */
398 err = -EINVAL;
1da177e4 399 goto done;
917f2f10 400 }
1da177e4
LT		 401 /* if a source filter was set, must be the same mode as before */
402 if (pmc->sflist) {
917f2f10
DS		 403 if (pmc->sfmode != omode) {
404 err = -EINVAL;
1da177e4 405 goto done;
917f2f10 406 }
1da177e4
LT		 407 } else if (pmc->sfmode != omode) {
408 /* allow mode switches for empty-set filters */
409 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
410 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
411 pmc->sfmode = omode;
412 }
413
5ab4a6c8
DS		 414 write_lock_bh(&pmc->sflock);
415 pmclocked = 1;
416
1da177e4
LT		 417 psl = pmc->sflist;
418 if (!add) {
419 if (!psl)
917f2f10 420 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 421 rv = !0;
422 for (i=0; i<psl->sl_count; i++) {
423 rv = memcmp(&psl->sl_addr[i], source,
424 sizeof(struct in6_addr));
425 if (rv == 0)
426 break;
427 }
428 if (rv) /* source not found */
917f2f10 429 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 430
c9e3e8b6
DS		 431 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
432 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
433 leavegroup = 1;
434 goto done;
435 }
436
1da177e4
LT		 437 /* update the interface filter */
438 ip6_mc_del_src(idev, group, omode, 1, source, 1);
439
440 for (j=i+1; j<psl->sl_count; j++)
441 psl->sl_addr[j-1] = psl->sl_addr[j];
442 psl->sl_count--;
443 err = 0;
444 goto done;
445 }
446 /* else, add a new source to the filter */
447
448 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
449 err = -ENOBUFS;
450 goto done;
451 }
452 if (!psl || psl->sl_count == psl->sl_max) {
453 struct ip6_sf_socklist *newpsl;
454 int count = IP6_SFBLOCK;
455
456 if (psl)
457 count += psl->sl_max;
8b3a7005 458 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 459 if (!newpsl) {
460 err = -ENOBUFS;
461 goto done;
462 }
463 newpsl->sl_max = count;
464 newpsl->sl_count = count - IP6_SFBLOCK;
465 if (psl) {
466 for (i=0; i<psl->sl_count; i++)
467 newpsl->sl_addr[i] = psl->sl_addr[i];
468 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
469 }
470 pmc->sflist = psl = newpsl;
471 }
472 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
473 for (i=0; i<psl->sl_count; i++) {
474 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
475 if (rv == 0)
476 break;
477 }
478 if (rv == 0) /* address already there is an error */
479 goto done;
480 for (j=psl->sl_count-1; j>=i; j--)
481 psl->sl_addr[j+1] = psl->sl_addr[j];
482 psl->sl_addr[i] = *source;
483 psl->sl_count++;
484 err = 0;
485 /* update the interface list */
486 ip6_mc_add_src(idev, group, omode, 1, source, 1);
487done:
5ab4a6c8
DS		 488 if (pmclocked)
489 write_unlock_bh(&pmc->sflock);
c9e3e8b6 490 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 491 read_unlock_bh(&idev->lock);
492 in6_dev_put(idev);
493 dev_put(dev);
c9e3e8b6
DS		 494 if (leavegroup)
495 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 496 return err;
497}
498
499int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
500{
501 struct in6_addr *group;
502 struct ipv6_mc_socklist *pmc;
503 struct net_device *dev;
504 struct inet6_dev *idev;
505 struct ipv6_pinfo *inet6 = inet6_sk(sk);
506 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 507 struct net *net = sock_net(sk);
9951f036 508 int leavegroup = 0;
1da177e4
LT		 509 int i, err;
510
511 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
512
513 if (!ipv6_addr_is_multicast(group))
514 return -EINVAL;
515 if (gsf->gf_fmode != MCAST_INCLUDE &&
516 gsf->gf_fmode != MCAST_EXCLUDE)
517 return -EINVAL;
518
b8ad0cbc 519 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 520
521 if (!idev)
522 return -ENODEV;
523 dev = idev->dev;
1da177e4 524
9c05989b 525 err = 0;
5ab4a6c8
DS		 526 read_lock_bh(&ipv6_sk_mc_lock);
527
9951f036
DS		 528 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
529 leavegroup = 1;
530 goto done;
531 }
532
1da177e4
LT		 533 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
534 if (pmc->ifindex != gsf->gf_interface)
535 continue;
536 if (ipv6_addr_equal(&pmc->addr, group))
537 break;
538 }
917f2f10
DS		 539 if (!pmc) { /* must have a prior join */
540 err = -EINVAL;
1da177e4 541 goto done;
917f2f10 542 }
1da177e4 543 if (gsf->gf_numsrc) {
8b3a7005
KK		 544 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
545 GFP_ATOMIC);
1da177e4
LT		 546 if (!newpsl) {
547 err = -ENOBUFS;
548 goto done;
549 }
550 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
551 for (i=0; i<newpsl->sl_count; ++i) {
552 struct sockaddr_in6 *psin6;
553
554 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
555 newpsl->sl_addr[i] = psin6->sin6_addr;
556 }
557 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
558 newpsl->sl_count, newpsl->sl_addr, 0);
559 if (err) {
560 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
561 goto done;
562 }
8713dbf0 563 } else {
1da177e4 564 newpsl = NULL;
8713dbf0
YZ		 565 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
566 }
5ab4a6c8
DS		 567
568 write_lock_bh(&pmc->sflock);
1da177e4
LT		 569 psl = pmc->sflist;
570 if (psl) {
571 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
572 psl->sl_count, psl->sl_addr, 0);
573 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
574 } else
575 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
576 pmc->sflist = newpsl;
577 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 578 write_unlock_bh(&pmc->sflock);
917f2f10 579 err = 0;
1da177e4 580done:
5ab4a6c8 581 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 582 read_unlock_bh(&idev->lock);
583 in6_dev_put(idev);
584 dev_put(dev);
9951f036
DS		 585 if (leavegroup)
586 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 587 return err;
588}
589
590int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
591 struct group_filter __user *optval, int __user *optlen)
592{
593 int err, i, count, copycount;
594 struct in6_addr *group;
595 struct ipv6_mc_socklist *pmc;
596 struct inet6_dev *idev;
597 struct net_device *dev;
598 struct ipv6_pinfo *inet6 = inet6_sk(sk);
599 struct ip6_sf_socklist *psl;
3b1e0a65 600 struct net *net = sock_net(sk);
1da177e4
LT		 601
602 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
603
604 if (!ipv6_addr_is_multicast(group))
605 return -EINVAL;
606
b8ad0cbc 607 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 608
609 if (!idev)
610 return -ENODEV;
611
612 dev = idev->dev;
613
614 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 615 /*
616 * changes to the ipv6_mc_list require the socket lock and
617 * a read lock on ip6_sk_mc_lock. We have the socket lock,
618 * so reading the list is safe.
619 */
1da177e4
LT		 620
621 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
622 if (pmc->ifindex != gsf->gf_interface)
623 continue;
624 if (ipv6_addr_equal(group, &pmc->addr))
625 break;
626 }
627 if (!pmc) /* must have a prior join */
628 goto done;
629 gsf->gf_fmode = pmc->sfmode;
630 psl = pmc->sflist;
631 count = psl ? psl->sl_count : 0;
632 read_unlock_bh(&idev->lock);
633 in6_dev_put(idev);
634 dev_put(dev);
635
636 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
637 gsf->gf_numsrc = count;
638 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
639 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
640 return -EFAULT;
641 }
5ab4a6c8
DS		 642 /* changes to psl require the socket lock, a read lock on
643 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
644 * have the socket lock, so reading here is safe.
645 */
1da177e4
LT		 646 for (i=0; i<copycount; i++) {
647 struct sockaddr_in6 *psin6;
648 struct sockaddr_storage ss;
649
650 psin6 = (struct sockaddr_in6 *)&ss;
651 memset(&ss, 0, sizeof(ss));
652 psin6->sin6_family = AF_INET6;
653 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 654 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 655 return -EFAULT;
656 }
657 return 0;
658done:
659 read_unlock_bh(&idev->lock);
660 in6_dev_put(idev);
661 dev_put(dev);
662 return err;
663}
664
9acd9f3a
YH		 665int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
666 const struct in6_addr *src_addr)
1da177e4
LT		 667{
668 struct ipv6_pinfo *np = inet6_sk(sk);
669 struct ipv6_mc_socklist *mc;
670 struct ip6_sf_socklist *psl;
671 int rv = 1;
672
673 read_lock(&ipv6_sk_mc_lock);
674 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
675 if (ipv6_addr_equal(&mc->addr, mc_addr))
676 break;
677 }
678 if (!mc) {
679 read_unlock(&ipv6_sk_mc_lock);
680 return 1;
681 }
5ab4a6c8 682 read_lock(&mc->sflock);
1da177e4
LT		 683 psl = mc->sflist;
684 if (!psl) {
685 rv = mc->sfmode == MCAST_EXCLUDE;
686 } else {
687 int i;
688
689 for (i=0; i<psl->sl_count; i++) {
690 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
691 break;
692 }
693 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
694 rv = 0;
695 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
696 rv = 0;
697 }
5ab4a6c8 698 read_unlock(&mc->sflock);
1da177e4
LT		 699 read_unlock(&ipv6_sk_mc_lock);
700
701 return rv;
702}
703
704static void ma_put(struct ifmcaddr6 *mc)
705{
706 if (atomic_dec_and_test(&mc->mca_refcnt)) {
707 in6_dev_put(mc->idev);
708 kfree(mc);
709 }
710}
711
712static void igmp6_group_added(struct ifmcaddr6 *mc)
713{
714 struct net_device *dev = mc->idev->dev;
715 char buf[MAX_ADDR_LEN];
716
717 spin_lock_bh(&mc->mca_lock);
718 if (!(mc->mca_flags&MAF_LOADED)) {
719 mc->mca_flags |= MAF_LOADED;
720 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
721 dev_mc_add(dev, buf, dev->addr_len, 0);
722 }
723 spin_unlock_bh(&mc->mca_lock);
724
725 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
726 return;
727
728 if (MLD_V1_SEEN(mc->idev)) {
729 igmp6_join_group(mc);
730 return;
731 }
732 /* else v2 */
733
734 mc->mca_crcount = mc->idev->mc_qrv;
735 mld_ifc_event(mc->idev);
736}
737
738static void igmp6_group_dropped(struct ifmcaddr6 *mc)
739{
740 struct net_device *dev = mc->idev->dev;
741 char buf[MAX_ADDR_LEN];
742
743 spin_lock_bh(&mc->mca_lock);
744 if (mc->mca_flags&MAF_LOADED) {
745 mc->mca_flags &= ~MAF_LOADED;
746 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
747 dev_mc_delete(dev, buf, dev->addr_len, 0);
748 }
749
750 if (mc->mca_flags & MAF_NOREPORT)
751 goto done;
752 spin_unlock_bh(&mc->mca_lock);
753
754 if (!mc->idev->dead)
755 igmp6_leave_group(mc);
756
757 spin_lock_bh(&mc->mca_lock);
758 if (del_timer(&mc->mca_timer))
759 atomic_dec(&mc->mca_refcnt);
760done:
761 ip6_mc_clear_src(mc);
762 spin_unlock_bh(&mc->mca_lock);
763}
764
765/*
766 * deleted ifmcaddr6 manipulation
767 */
768static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
769{
770 struct ifmcaddr6 *pmc;
771
772 /* this is an "ifmcaddr6" for convenience; only the fields below
773 * are actually used. In particular, the refcnt and users are not
774 * used for management of the delete list. Using the same structure
775 * for deleted items allows change reports to use common code with
776 * non-deleted or query-response MCA's.
777 */
0c600eda 778 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 779 if (!pmc)
780 return;
0c600eda 781
1da177e4
LT		 782 spin_lock_bh(&im->mca_lock);
783 spin_lock_init(&pmc->mca_lock);
784 pmc->idev = im->idev;
785 in6_dev_hold(idev);
786 pmc->mca_addr = im->mca_addr;
787 pmc->mca_crcount = idev->mc_qrv;
788 pmc->mca_sfmode = im->mca_sfmode;
789 if (pmc->mca_sfmode == MCAST_INCLUDE) {
790 struct ip6_sf_list *psf;
791
792 pmc->mca_tomb = im->mca_tomb;
793 pmc->mca_sources = im->mca_sources;
794 im->mca_tomb = im->mca_sources = NULL;
795 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
796 psf->sf_crcount = pmc->mca_crcount;
797 }
798 spin_unlock_bh(&im->mca_lock);
799
800 write_lock_bh(&idev->mc_lock);
801 pmc->next = idev->mc_tomb;
802 idev->mc_tomb = pmc;
803 write_unlock_bh(&idev->mc_lock);
804}
805
806static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
807{
808 struct ifmcaddr6 *pmc, *pmc_prev;
809 struct ip6_sf_list *psf, *psf_next;
810
811 write_lock_bh(&idev->mc_lock);
812 pmc_prev = NULL;
813 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
814 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
815 break;
816 pmc_prev = pmc;
817 }
818 if (pmc) {
819 if (pmc_prev)
820 pmc_prev->next = pmc->next;
821 else
822 idev->mc_tomb = pmc->next;
823 }
824 write_unlock_bh(&idev->mc_lock);
825 if (pmc) {
826 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
827 psf_next = psf->sf_next;
828 kfree(psf);
829 }
830 in6_dev_put(pmc->idev);
831 kfree(pmc);
832 }
833}
834
835static void mld_clear_delrec(struct inet6_dev *idev)
836{
837 struct ifmcaddr6 *pmc, *nextpmc;
838
839 write_lock_bh(&idev->mc_lock);
840 pmc = idev->mc_tomb;
841 idev->mc_tomb = NULL;
842 write_unlock_bh(&idev->mc_lock);
843
844 for (; pmc; pmc = nextpmc) {
845 nextpmc = pmc->next;
846 ip6_mc_clear_src(pmc);
847 in6_dev_put(pmc->idev);
848 kfree(pmc);
849 }
850
851 /* clear dead sources, too */
852 read_lock_bh(&idev->lock);
853 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
854 struct ip6_sf_list *psf, *psf_next;
855
856 spin_lock_bh(&pmc->mca_lock);
857 psf = pmc->mca_tomb;
858 pmc->mca_tomb = NULL;
859 spin_unlock_bh(&pmc->mca_lock);
860 for (; psf; psf=psf_next) {
861 psf_next = psf->sf_next;
862 kfree(psf);
863 }
864 }
865 read_unlock_bh(&idev->lock);
866}
867
868
869/*
870 * device multicast group inc (add if not found)
871 */
9acd9f3a 872int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 873{
874 struct ifmcaddr6 *mc;
875 struct inet6_dev *idev;
876
877 idev = in6_dev_get(dev);
878
879 if (idev == NULL)
880 return -EINVAL;
881
882 write_lock_bh(&idev->lock);
883 if (idev->dead) {
884 write_unlock_bh(&idev->lock);
885 in6_dev_put(idev);
886 return -ENODEV;
887 }
888
889 for (mc = idev->mc_list; mc; mc = mc->next) {
890 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
891 mc->mca_users++;
892 write_unlock_bh(&idev->lock);
893 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
894 NULL, 0);
895 in6_dev_put(idev);
896 return 0;
897 }
898 }
899
900 /*
901 * not found: create a new one.
902 */
903
0c600eda 904 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 905
906 if (mc == NULL) {
907 write_unlock_bh(&idev->lock);
908 in6_dev_put(idev);
909 return -ENOMEM;
910 }
911
b24b8a24 912 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4
LT		 913
914 ipv6_addr_copy(&mc->mca_addr, addr);
915 mc->idev = idev;
916 mc->mca_users = 1;
917 /* mca_stamp should be updated upon changes */
918 mc->mca_cstamp = mc->mca_tstamp = jiffies;
919 atomic_set(&mc->mca_refcnt, 2);
920 spin_lock_init(&mc->mca_lock);
921
922 /* initial mode is (EX, empty) */
923 mc->mca_sfmode = MCAST_EXCLUDE;
924 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
925
926 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
927 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
928 mc->mca_flags |= MAF_NOREPORT;
929
930 mc->next = idev->mc_list;
931 idev->mc_list = mc;
932 write_unlock_bh(&idev->lock);
933
934 mld_del_delrec(idev, &mc->mca_addr);
935 igmp6_group_added(mc);
936 ma_put(mc);
937 return 0;
938}
939
940/*
941 * device multicast group del
942 */
9acd9f3a 943int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 944{
945 struct ifmcaddr6 *ma, **map;
946
947 write_lock_bh(&idev->lock);
948 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
949 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
950 if (--ma->mca_users == 0) {
951 *map = ma->next;
952 write_unlock_bh(&idev->lock);
953
954 igmp6_group_dropped(ma);
955
956 ma_put(ma);
957 return 0;
958 }
959 write_unlock_bh(&idev->lock);
960 return 0;
961 }
962 }
963 write_unlock_bh(&idev->lock);
964
965 return -ENOENT;
966}
967
9acd9f3a 968int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 969{
970 struct inet6_dev *idev = in6_dev_get(dev);
971 int err;
972
973 if (!idev)
974 return -ENODEV;
975
976 err = __ipv6_dev_mc_dec(idev, addr);
977
978 in6_dev_put(idev);
979
980 return err;
981}
982
983/*
984 * identify MLD packets for MLD filter exceptions
985 */
986int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
987{
988 struct icmp6hdr *pic;
989
990 if (nexthdr != IPPROTO_ICMPV6)
991 return 0;
992
993 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
994 return 0;
995
cc70ab26 996 pic = icmp6_hdr(skb);
1da177e4
LT		 997
998 switch (pic->icmp6_type) {
999 case ICMPV6_MGM_QUERY:
1000 case ICMPV6_MGM_REPORT:
1001 case ICMPV6_MGM_REDUCTION:
1002 case ICMPV6_MLD2_REPORT:
1003 return 1;
1004 default:
1005 break;
1006 }
1007 return 0;
1008}
1009
1010/*
1011 * check if the interface/address pair is valid
1012 */
9acd9f3a
YH		 1013int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1014 const struct in6_addr *src_addr)
1da177e4
LT		 1015{
1016 struct inet6_dev *idev;
1017 struct ifmcaddr6 *mc;
1018 int rv = 0;
1019
1020 idev = in6_dev_get(dev);
1021 if (idev) {
1022 read_lock_bh(&idev->lock);
1023 for (mc = idev->mc_list; mc; mc=mc->next) {
1024 if (ipv6_addr_equal(&mc->mca_addr, group))
1025 break;
1026 }
1027 if (mc) {
1028 if (src_addr && !ipv6_addr_any(src_addr)) {
1029 struct ip6_sf_list *psf;
1030
1031 spin_lock_bh(&mc->mca_lock);
1032 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1033 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1034 break;
1035 }
1036 if (psf)
1037 rv = psf->sf_count[MCAST_INCLUDE] ||
1038 psf->sf_count[MCAST_EXCLUDE] !=
1039 mc->mca_sfcount[MCAST_EXCLUDE];
1040 else
1041 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1042 spin_unlock_bh(&mc->mca_lock);
1043 } else
1044 rv = 1; /* don't filter unspecified source */
1045 }
1046 read_unlock_bh(&idev->lock);
1047 in6_dev_put(idev);
1048 }
1049 return rv;
1050}
1051
1052static void mld_gq_start_timer(struct inet6_dev *idev)
1053{
1054 int tv = net_random() % idev->mc_maxdelay;
1055
1056 idev->mc_gq_running = 1;
1057 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1058 in6_dev_hold(idev);
1059}
1060
1061static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1062{
1063 int tv = net_random() % delay;
1064
1065 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1066 in6_dev_hold(idev);
1067}
1068
1069/*
1070 * IGMP handling (alias multicast ICMPv6 messages)
1071 */
1072
1073static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1074{
1075 unsigned long delay = resptime;
1076
1077 /* Do not start timer for these addresses */
1078 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1079 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1080 return;
1081
1082 if (del_timer(&ma->mca_timer)) {
1083 atomic_dec(&ma->mca_refcnt);
1084 delay = ma->mca_timer.expires - jiffies;
1085 }
1086
1087 if (delay >= resptime) {
1088 if (resptime)
1089 delay = net_random() % resptime;
1090 else
1091 delay = 1;
1092 }
1093 ma->mca_timer.expires = jiffies + delay;
1094 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1095 atomic_inc(&ma->mca_refcnt);
1096 ma->mca_flags |= MAF_TIMER_RUNNING;
1097}
1098
5ab4a6c8
DS		 1099/* mark EXCLUDE-mode sources */
1100static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1101 struct in6_addr *srcs)
1102{
1103 struct ip6_sf_list *psf;
1104 int i, scount;
1105
1106 scount = 0;
1107 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1108 if (scount == nsrcs)
1109 break;
5ab4a6c8
DS		 1110 for (i=0; i<nsrcs; i++) {
1111 /* skip inactive filters */
1112 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1113 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1114 psf->sf_count[MCAST_EXCLUDE])
1115 continue;
1116 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1117 scount++;
1118 break;
1119 }
1120 }
1121 }
1122 pmc->mca_flags &= ~MAF_GSQUERY;
1123 if (scount == nsrcs) /* all sources excluded */
1124 return 0;
1125 return 1;
1126}
1127
1128static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1129 struct in6_addr *srcs)
1130{
1131 struct ip6_sf_list *psf;
1132 int i, scount;
1133
1134 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1135 return mld_xmarksources(pmc, nsrcs, srcs);
1136
1137 /* mark INCLUDE-mode sources */
1138
1139 scount = 0;
1140 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1141 if (scount == nsrcs)
1142 break;
1143 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1144 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1145 psf->sf_gsresp = 1;
1146 scount++;
1147 break;
1148 }
5ab4a6c8
DS		 1149 }
1150 }
1151 if (!scount) {
1152 pmc->mca_flags &= ~MAF_GSQUERY;
1153 return 0;
1da177e4 1154 }
5ab4a6c8
DS		 1155 pmc->mca_flags |= MAF_GSQUERY;
1156 return 1;
1da177e4
LT		 1157}
1158
1159int igmp6_event_query(struct sk_buff *skb)
1160{
97300b5f 1161 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1162 struct ifmcaddr6 *ma;
1163 struct in6_addr *group;
1164 unsigned long max_delay;
1165 struct inet6_dev *idev;
1166 struct icmp6hdr *hdr;
1167 int group_type;
1168 int mark = 0;
1169 int len;
1170
1171 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1172 return -EINVAL;
1173
1174 /* compute payload length excluding extension headers */
0660e03f 1175 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1176 len -= skb_network_header_len(skb);
1da177e4
LT		 1177
1178 /* Drop queries with not link local source */
0660e03f 1179 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1180 return -EINVAL;
1181
1182 idev = in6_dev_get(skb->dev);
1183
1184 if (idev == NULL)
1185 return 0;
1186
cc70ab26 1187 hdr = icmp6_hdr(skb);
1da177e4
LT		 1188 group = (struct in6_addr *) (hdr + 1);
1189 group_type = ipv6_addr_type(group);
1190
1191 if (group_type != IPV6_ADDR_ANY &&
1192 !(group_type&IPV6_ADDR_MULTICAST)) {
1193 in6_dev_put(idev);
1194 return -EINVAL;
1195 }
1196
1197 if (len == 24) {
1198 int switchback;
1199 /* MLDv1 router present */
1200
1201 /* Translate milliseconds to jiffies */
1202 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1203
1204 switchback = (idev->mc_qrv + 1) * max_delay;
1205 idev->mc_v1_seen = jiffies + switchback;
1206
1207 /* cancel the interface change timer */
1208 idev->mc_ifc_count = 0;
1209 if (del_timer(&idev->mc_ifc_timer))
1210 __in6_dev_put(idev);
1211 /* clear deleted report items */
1212 mld_clear_delrec(idev);
1213 } else if (len >= 28) {
1ab1457c 1214 int srcs_offset = sizeof(struct mld2_query) -
97300b5f
YZ		 1215 sizeof(struct icmp6hdr);
1216 if (!pskb_may_pull(skb, srcs_offset)) {
1217 in6_dev_put(idev);
1218 return -EINVAL;
1219 }
9c70220b 1220 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1da177e4
LT		 1221 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1222 if (!max_delay)
1223 max_delay = 1;
1224 idev->mc_maxdelay = max_delay;
1225 if (mlh2->qrv)
1226 idev->mc_qrv = mlh2->qrv;
1227 if (group_type == IPV6_ADDR_ANY) { /* general query */
1228 if (mlh2->nsrcs) {
1229 in6_dev_put(idev);
1230 return -EINVAL; /* no sources allowed */
1231 }
1232 mld_gq_start_timer(idev);
1233 in6_dev_put(idev);
1234 return 0;
1235 }
1236 /* mark sources to include, if group & source-specific */
97300b5f 1237 if (mlh2->nsrcs != 0) {
1ab1457c 1238 if (!pskb_may_pull(skb, srcs_offset +
5ab4a6c8 1239 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1240 in6_dev_put(idev);
1241 return -EINVAL;
1242 }
9c70220b 1243 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1244 mark = 1;
1245 }
1da177e4
LT		 1246 } else {
1247 in6_dev_put(idev);
1248 return -EINVAL;
1249 }
1250
1251 read_lock_bh(&idev->lock);
1252 if (group_type == IPV6_ADDR_ANY) {
1253 for (ma = idev->mc_list; ma; ma=ma->next) {
1254 spin_lock_bh(&ma->mca_lock);
1255 igmp6_group_queried(ma, max_delay);
1256 spin_unlock_bh(&ma->mca_lock);
1257 }
1258 } else {
1259 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1260 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1261 continue;
1262 spin_lock_bh(&ma->mca_lock);
1263 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1264 /* gsquery <- gsquery && mark */
1265 if (!mark)
1266 ma->mca_flags &= ~MAF_GSQUERY;
1267 } else {
1268 /* gsquery <- mark */
1269 if (mark)
1270 ma->mca_flags |= MAF_GSQUERY;
1271 else
1272 ma->mca_flags &= ~MAF_GSQUERY;
1273 }
5ab4a6c8 1274 if (!(ma->mca_flags & MAF_GSQUERY) ||
7add2a43 1275 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
5ab4a6c8 1276 igmp6_group_queried(ma, max_delay);
1da177e4 1277 spin_unlock_bh(&ma->mca_lock);
7add2a43 1278 break;
1da177e4
LT		 1279 }
1280 }
1281 read_unlock_bh(&idev->lock);
1282 in6_dev_put(idev);
1283
1284 return 0;
1285}
1286
1287
1288int igmp6_event_report(struct sk_buff *skb)
1289{
1290 struct ifmcaddr6 *ma;
1291 struct in6_addr *addrp;
1292 struct inet6_dev *idev;
1293 struct icmp6hdr *hdr;
1294 int addr_type;
1295
1296 /* Our own report looped back. Ignore it. */
1297 if (skb->pkt_type == PACKET_LOOPBACK)
1298 return 0;
1299
24c69275
DS		 1300 /* send our report if the MC router may not have heard this report */
1301 if (skb->pkt_type != PACKET_MULTICAST &&
1302 skb->pkt_type != PACKET_BROADCAST)
1303 return 0;
1304
1da177e4
LT		 1305 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1306 return -EINVAL;
1307
cc70ab26 1308 hdr = icmp6_hdr(skb);
1da177e4
LT		 1309
1310 /* Drop reports with not link local source */
0660e03f 1311 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1312 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1313 !(addr_type&IPV6_ADDR_LINKLOCAL))
1314 return -EINVAL;
1315
1316 addrp = (struct in6_addr *) (hdr + 1);
1317
1318 idev = in6_dev_get(skb->dev);
1319 if (idev == NULL)
1320 return -ENODEV;
1321
1322 /*
1323 * Cancel the timer for this group
1324 */
1325
1326 read_lock_bh(&idev->lock);
1327 for (ma = idev->mc_list; ma; ma=ma->next) {
1328 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1329 spin_lock(&ma->mca_lock);
1330 if (del_timer(&ma->mca_timer))
1331 atomic_dec(&ma->mca_refcnt);
1332 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1333 spin_unlock(&ma->mca_lock);
1334 break;
1335 }
1336 }
1337 read_unlock_bh(&idev->lock);
1338 in6_dev_put(idev);
1339 return 0;
1340}
1341
1342static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1343 int gdeleted, int sdeleted)
1344{
1345 switch (type) {
1346 case MLD2_MODE_IS_INCLUDE:
1347 case MLD2_MODE_IS_EXCLUDE:
1348 if (gdeleted || sdeleted)
1349 return 0;
5ab4a6c8
DS		 1350 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1351 if (pmc->mca_sfmode == MCAST_INCLUDE)
1352 return 1;
1353 /* don't include if this source is excluded
1354 * in all filters
1355 */
1356 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1357 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1358 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1359 psf->sf_count[MCAST_EXCLUDE];
1360 }
1361 return 0;
1da177e4
LT		 1362 case MLD2_CHANGE_TO_INCLUDE:
1363 if (gdeleted || sdeleted)
1364 return 0;
1365 return psf->sf_count[MCAST_INCLUDE] != 0;
1366 case MLD2_CHANGE_TO_EXCLUDE:
1367 if (gdeleted || sdeleted)
1368 return 0;
1369 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1370 psf->sf_count[MCAST_INCLUDE])
1371 return 0;
1372 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1373 psf->sf_count[MCAST_EXCLUDE];
1374 case MLD2_ALLOW_NEW_SOURCES:
1375 if (gdeleted || !psf->sf_crcount)
1376 return 0;
1377 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1378 case MLD2_BLOCK_OLD_SOURCES:
1379 if (pmc->mca_sfmode == MCAST_INCLUDE)
1380 return gdeleted || (psf->sf_crcount && sdeleted);
1381 return psf->sf_crcount && !gdeleted && !sdeleted;
1382 }
1383 return 0;
1384}
1385
1386static int
1387mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1388{
1389 struct ip6_sf_list *psf;
1390 int scount = 0;
1391
1392 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1393 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1394 continue;
1395 scount++;
1396 }
1397 return scount;
1398}
1399
1400static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1401{
c346dca1 1402 struct net *net = dev_net(dev);
b8ad0cbc 1403 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1404 struct sk_buff *skb;
1405 struct mld2_report *pmr;
1406 struct in6_addr addr_buf;
1407 int err;
1408 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1409 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1410 IPV6_TLV_PADN, 0 };
1411
1412 /* we assume size > sizeof(ra) here */
1413 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1414
cfcabdcc 1415 if (!skb)
1da177e4
LT		 1416 return NULL;
1417
1418 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1419
95c385b4 1420 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1421 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1422 * use unspecified address as the source address
1da177e4
LT		 1423 * when a valid link-local address is not available.
1424 */
1425 memset(&addr_buf, 0, sizeof(addr_buf));
1426 }
1427
1428 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1429
1430 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1431
27a884dc 1432 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1433 skb_put(skb, sizeof(*pmr));
1434 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1435 pmr->type = ICMPV6_MLD2_REPORT;
1436 pmr->resv1 = 0;
1437 pmr->csum = 0;
1438 pmr->resv2 = 0;
1439 pmr->ngrec = 0;
1440 return skb;
1441}
1442
1443static void mld_sendpack(struct sk_buff *skb)
1444{
0660e03f 1445 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1446 struct mld2_report *pmr =
1447 (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1448 int payload_len, mldlen;
1449 struct inet6_dev *idev = in6_dev_get(skb->dev);
c346dca1 1450 struct net *net = dev_net(skb->dev);
1da177e4 1451 int err;
41927178 1452 struct flowi fl;
1da177e4 1453
a11d206d 1454 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
27a884dc
ACM		 1455 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1456 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1457 pip6->payload_len = htons(payload_len);
1458
1459 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
9c70220b
ACM		 1460 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1461 mldlen, 0));
41927178
YH		 1462
1463 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1464
1465 if (!skb->dst) {
1466 err = -ENOMEM;
1467 goto err_out;
1468 }
1469
b8ad0cbc 1470 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
41927178
YH		 1471 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1472 skb->dev->ifindex);
1473
1474 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1475 if (err)
1476 goto err_out;
1477
6e23ae2a 1478 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1479 dst_output);
1480out:
1da177e4 1481 if (!err) {
14878f75
DS		 1482 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1483 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1484 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1485 } else
14878f75 1486 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1487
1488 if (likely(idev != NULL))
1489 in6_dev_put(idev);
41927178
YH		 1490 return;
1491
1492err_out:
1493 kfree_skb(skb);
1494 goto out;
1da177e4
LT		 1495}
1496
1497static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1498{
fab10fe3 1499 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1500}
1501
1502static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1503 int type, struct mld2_grec **ppgr)
1504{
1505 struct net_device *dev = pmc->idev->dev;
1506 struct mld2_report *pmr;
1507 struct mld2_grec *pgr;
1508
1509 if (!skb)
1510 skb = mld_newpack(dev, dev->mtu);
1511 if (!skb)
1512 return NULL;
1513 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1514 pgr->grec_type = type;
1515 pgr->grec_auxwords = 0;
1516 pgr->grec_nsrcs = 0;
1517 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1518 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1519 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1520 *ppgr = pgr;
1521 return skb;
1522}
1523
1524#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1525 skb_tailroom(skb)) : 0)
1526
1527static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1528 int type, int gdeleted, int sdeleted)
1529{
1530 struct net_device *dev = pmc->idev->dev;
1531 struct mld2_report *pmr;
1532 struct mld2_grec *pgr = NULL;
1533 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1534 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1535
1536 if (pmc->mca_flags & MAF_NOREPORT)
1537 return skb;
1538
1539 isquery = type == MLD2_MODE_IS_INCLUDE ||
1540 type == MLD2_MODE_IS_EXCLUDE;
1541 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1542 type == MLD2_CHANGE_TO_EXCLUDE;
1543
5ab4a6c8
DS		 1544 stotal = scount = 0;
1545
1da177e4
LT		 1546 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1547
5ab4a6c8
DS		 1548 if (!*psf_list)
1549 goto empty_source;
1550
9c70220b 1551 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1552
1553 /* EX and TO_EX get a fresh packet, if needed */
1554 if (truncate) {
1555 if (pmr && pmr->ngrec &&
1556 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1557 if (skb)
1558 mld_sendpack(skb);
1559 skb = mld_newpack(dev, dev->mtu);
1560 }
1561 }
1562 first = 1;
1da177e4
LT		 1563 psf_prev = NULL;
1564 for (psf=*psf_list; psf; psf=psf_next) {
1565 struct in6_addr *psrc;
1566
1567 psf_next = psf->sf_next;
1568
1569 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1570 psf_prev = psf;
1571 continue;
1572 }
1573
1574 /* clear marks on query responses */
1575 if (isquery)
1576 psf->sf_gsresp = 0;
1577
1578 if (AVAILABLE(skb) < sizeof(*psrc) +
1579 first*sizeof(struct mld2_grec)) {
1580 if (truncate && !first)
1581 break; /* truncate these */
1582 if (pgr)
1583 pgr->grec_nsrcs = htons(scount);
1584 if (skb)
1585 mld_sendpack(skb);
1586 skb = mld_newpack(dev, dev->mtu);
1587 first = 1;
1588 scount = 0;
1589 }
1590 if (first) {
1591 skb = add_grhead(skb, pmc, type, &pgr);
1592 first = 0;
1593 }
cc63f70b
AD		 1594 if (!skb)
1595 return NULL;
1da177e4
LT		 1596 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1597 *psrc = psf->sf_addr;
5ab4a6c8 1598 scount++; stotal++;
1da177e4
LT		 1599 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1600 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1601 psf->sf_crcount--;
1602 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1603 if (psf_prev)
1604 psf_prev->sf_next = psf->sf_next;
1605 else
1606 *psf_list = psf->sf_next;
1607 kfree(psf);
1608 continue;
1609 }
1610 }
1611 psf_prev = psf;
1612 }
5ab4a6c8
DS		 1613
1614empty_source:
1615 if (!stotal) {
1616 if (type == MLD2_ALLOW_NEW_SOURCES ||
1617 type == MLD2_BLOCK_OLD_SOURCES)
1618 return skb;
1619 if (pmc->mca_crcount || isquery) {
1620 /* make sure we have room for group header */
1621 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1622 mld_sendpack(skb);
1623 skb = NULL; /* add_grhead will get a new one */
1624 }
1625 skb = add_grhead(skb, pmc, type, &pgr);
1626 }
1627 }
1da177e4
LT		 1628 if (pgr)
1629 pgr->grec_nsrcs = htons(scount);
1630
1631 if (isquery)
1632 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1633 return skb;
1634}
1635
1636static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1637{
1638 struct sk_buff *skb = NULL;
1639 int type;
1640
1641 if (!pmc) {
1642 read_lock_bh(&idev->lock);
1643 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1644 if (pmc->mca_flags & MAF_NOREPORT)
1645 continue;
1646 spin_lock_bh(&pmc->mca_lock);
1647 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1648 type = MLD2_MODE_IS_EXCLUDE;
1649 else
1650 type = MLD2_MODE_IS_INCLUDE;
1651 skb = add_grec(skb, pmc, type, 0, 0);
1652 spin_unlock_bh(&pmc->mca_lock);
1653 }
1654 read_unlock_bh(&idev->lock);
1655 } else {
1656 spin_lock_bh(&pmc->mca_lock);
1657 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1658 type = MLD2_MODE_IS_EXCLUDE;
1659 else
1660 type = MLD2_MODE_IS_INCLUDE;
1661 skb = add_grec(skb, pmc, type, 0, 0);
1662 spin_unlock_bh(&pmc->mca_lock);
1663 }
1664 if (skb)
1665 mld_sendpack(skb);
1666}
1667
1668/*
1669 * remove zero-count source records from a source filter list
1670 */
1671static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1672{
1673 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1674
1675 psf_prev = NULL;
1676 for (psf=*ppsf; psf; psf = psf_next) {
1677 psf_next = psf->sf_next;
1678 if (psf->sf_crcount == 0) {
1679 if (psf_prev)
1680 psf_prev->sf_next = psf->sf_next;
1681 else
1682 *ppsf = psf->sf_next;
1683 kfree(psf);
1684 } else
1685 psf_prev = psf;
1686 }
1687}
1688
1689static void mld_send_cr(struct inet6_dev *idev)
1690{
1691 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1692 struct sk_buff *skb = NULL;
1693 int type, dtype;
1694
1695 read_lock_bh(&idev->lock);
1696 write_lock_bh(&idev->mc_lock);
1697
1698 /* deleted MCA's */
1699 pmc_prev = NULL;
1700 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1701 pmc_next = pmc->next;
1702 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1703 type = MLD2_BLOCK_OLD_SOURCES;
1704 dtype = MLD2_BLOCK_OLD_SOURCES;
1705 skb = add_grec(skb, pmc, type, 1, 0);
1706 skb = add_grec(skb, pmc, dtype, 1, 1);
1707 }
1708 if (pmc->mca_crcount) {
1da177e4
LT		 1709 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1710 type = MLD2_CHANGE_TO_INCLUDE;
1711 skb = add_grec(skb, pmc, type, 1, 0);
1712 }
5ab4a6c8 1713 pmc->mca_crcount--;
1da177e4
LT		 1714 if (pmc->mca_crcount == 0) {
1715 mld_clear_zeros(&pmc->mca_tomb);
1716 mld_clear_zeros(&pmc->mca_sources);
1717 }
1718 }
1719 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1720 !pmc->mca_sources) {
1721 if (pmc_prev)
1722 pmc_prev->next = pmc_next;
1723 else
1724 idev->mc_tomb = pmc_next;
1725 in6_dev_put(pmc->idev);
1726 kfree(pmc);
1727 } else
1728 pmc_prev = pmc;
1729 }
1730 write_unlock_bh(&idev->mc_lock);
1731
1732 /* change recs */
1733 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1734 spin_lock_bh(&pmc->mca_lock);
1735 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1736 type = MLD2_BLOCK_OLD_SOURCES;
1737 dtype = MLD2_ALLOW_NEW_SOURCES;
1738 } else {
1739 type = MLD2_ALLOW_NEW_SOURCES;
1740 dtype = MLD2_BLOCK_OLD_SOURCES;
1741 }
1742 skb = add_grec(skb, pmc, type, 0, 0);
1743 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1744
1745 /* filter mode changes */
1746 if (pmc->mca_crcount) {
1da177e4
LT		 1747 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1748 type = MLD2_CHANGE_TO_EXCLUDE;
1749 else
1750 type = MLD2_CHANGE_TO_INCLUDE;
1751 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1752 pmc->mca_crcount--;
1da177e4
LT		 1753 }
1754 spin_unlock_bh(&pmc->mca_lock);
1755 }
1756 read_unlock_bh(&idev->lock);
1757 if (!skb)
1758 return;
1759 (void) mld_sendpack(skb);
1760}
1761
1762static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1763{
c346dca1 1764 struct net *net = dev_net(dev);
b8ad0cbc 1765 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1766 struct inet6_dev *idev;
1ab1457c
YH		 1767 struct sk_buff *skb;
1768 struct icmp6hdr *hdr;
1da177e4
LT		 1769 struct in6_addr *snd_addr;
1770 struct in6_addr *addrp;
1771 struct in6_addr addr_buf;
1772 struct in6_addr all_routers;
1773 int err, len, payload_len, full_len;
1774 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1775 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1776 IPV6_TLV_PADN, 0 };
41927178 1777 struct flowi fl;
1da177e4 1778
a11d206d
YH		 1779 rcu_read_lock();
1780 IP6_INC_STATS(__in6_dev_get(dev),
1781 IPSTATS_MIB_OUTREQUESTS);
1782 rcu_read_unlock();
1da177e4
LT		 1783 snd_addr = addr;
1784 if (type == ICMPV6_MGM_REDUCTION) {
1785 snd_addr = &all_routers;
1786 ipv6_addr_all_routers(&all_routers);
1787 }
1788
1789 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1790 payload_len = len + sizeof(ra);
1791 full_len = sizeof(struct ipv6hdr) + payload_len;
1792
1793 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1794
1795 if (skb == NULL) {
a11d206d
YH		 1796 rcu_read_lock();
1797 IP6_INC_STATS(__in6_dev_get(dev),
1798 IPSTATS_MIB_OUTDISCARDS);
1799 rcu_read_unlock();
1da177e4
LT		 1800 return;
1801 }
1802
1803 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1804
95c385b4 1805 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1806 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1807 * use unspecified address as the source address
1da177e4
LT		 1808 * when a valid link-local address is not available.
1809 */
1810 memset(&addr_buf, 0, sizeof(addr_buf));
1811 }
1812
1813 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1814
1815 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1816
1817 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1818 memset(hdr, 0, sizeof(struct icmp6hdr));
1819 hdr->icmp6_type = type;
1820
1821 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1822 ipv6_addr_copy(addrp, addr);
1823
1824 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1825 IPPROTO_ICMPV6,
1826 csum_partial((__u8 *) hdr, len, 0));
1827
1828 idev = in6_dev_get(skb->dev);
1829
41927178
YH		 1830 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1831 if (!skb->dst) {
1832 err = -ENOMEM;
1833 goto err_out;
1834 }
1835
b8ad0cbc 1836 icmpv6_flow_init(sk, &fl, type,
41927178
YH		 1837 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1838 skb->dev->ifindex);
1839
1840 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1841 if (err)
1842 goto err_out;
1843
6e23ae2a 1844 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1845 dst_output);
1846out:
1da177e4 1847 if (!err) {
14878f75 1848 ICMP6MSGOUT_INC_STATS(idev, type);
1da177e4 1849 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
a11d206d 1850 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1851 } else
a11d206d 1852 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1853
1854 if (likely(idev != NULL))
1855 in6_dev_put(idev);
1856 return;
41927178
YH		 1857
1858err_out:
1859 kfree_skb(skb);
1860 goto out;
1da177e4
LT		 1861}
1862
1863static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1864 struct in6_addr *psfsrc)
1865{
1866 struct ip6_sf_list *psf, *psf_prev;
1867 int rv = 0;
1868
1869 psf_prev = NULL;
1870 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1871 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1872 break;
1873 psf_prev = psf;
1874 }
1875 if (!psf || psf->sf_count[sfmode] == 0) {
1876 /* source filter not found, or count wrong => bug */
1877 return -ESRCH;
1878 }
1879 psf->sf_count[sfmode]--;
1880 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1881 struct inet6_dev *idev = pmc->idev;
1882
1883 /* no more filters for this source */
1884 if (psf_prev)
1885 psf_prev->sf_next = psf->sf_next;
1886 else
1887 pmc->mca_sources = psf->sf_next;
1888 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1889 !MLD_V1_SEEN(idev)) {
1890 psf->sf_crcount = idev->mc_qrv;
1891 psf->sf_next = pmc->mca_tomb;
1892 pmc->mca_tomb = psf;
1893 rv = 1;
1894 } else
1895 kfree(psf);
1896 }
1897 return rv;
1898}
1899
1900static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1901 int sfmode, int sfcount, struct in6_addr *psfsrc,
1902 int delta)
1903{
1904 struct ifmcaddr6 *pmc;
1905 int changerec = 0;
1906 int i, err;
1907
1908 if (!idev)
1909 return -ENODEV;
1910 read_lock_bh(&idev->lock);
1911 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1912 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1913 break;
1914 }
1915 if (!pmc) {
1916 /* MCA not found?? bug */
1917 read_unlock_bh(&idev->lock);
1918 return -ESRCH;
1919 }
1920 spin_lock_bh(&pmc->mca_lock);
1921 sf_markstate(pmc);
1922 if (!delta) {
1923 if (!pmc->mca_sfcount[sfmode]) {
1924 spin_unlock_bh(&pmc->mca_lock);
1925 read_unlock_bh(&idev->lock);
1926 return -EINVAL;
1927 }
1928 pmc->mca_sfcount[sfmode]--;
1929 }
1930 err = 0;
1931 for (i=0; i<sfcount; i++) {
1932 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1933
1934 changerec |= rv > 0;
1935 if (!err && rv < 0)
1936 err = rv;
1937 }
1938 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1939 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1940 pmc->mca_sfcount[MCAST_INCLUDE]) {
1941 struct ip6_sf_list *psf;
1942
1943 /* filter mode change */
1944 pmc->mca_sfmode = MCAST_INCLUDE;
1945 pmc->mca_crcount = idev->mc_qrv;
1946 idev->mc_ifc_count = pmc->mca_crcount;
1947 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1948 psf->sf_crcount = 0;
1949 mld_ifc_event(pmc->idev);
1950 } else if (sf_setstate(pmc) || changerec)
1951 mld_ifc_event(pmc->idev);
1952 spin_unlock_bh(&pmc->mca_lock);
1953 read_unlock_bh(&idev->lock);
1954 return err;
1955}
1956
1957/*
1958 * Add multicast single-source filter to the interface list
1959 */
1960static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1961 struct in6_addr *psfsrc, int delta)
1962{
1963 struct ip6_sf_list *psf, *psf_prev;
1964
1965 psf_prev = NULL;
1966 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1967 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1968 break;
1969 psf_prev = psf;
1970 }
1971 if (!psf) {
0c600eda 1972 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1973 if (!psf)
1974 return -ENOBUFS;
0c600eda 1975
1da177e4
LT		 1976 psf->sf_addr = *psfsrc;
1977 if (psf_prev) {
1978 psf_prev->sf_next = psf;
1979 } else
1980 pmc->mca_sources = psf;
1981 }
1982 psf->sf_count[sfmode]++;
1983 return 0;
1984}
1985
1986static void sf_markstate(struct ifmcaddr6 *pmc)
1987{
1988 struct ip6_sf_list *psf;
1989 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1990
1991 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1992 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1993 psf->sf_oldin = mca_xcount ==
1994 psf->sf_count[MCAST_EXCLUDE] &&
1995 !psf->sf_count[MCAST_INCLUDE];
1996 } else
1997 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1998}
1999
2000static int sf_setstate(struct ifmcaddr6 *pmc)
2001{
7add2a43 2002 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2003 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2004 int qrv = pmc->idev->mc_qrv;
2005 int new_in, rv;
2006
2007 rv = 0;
2008 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2009 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2010 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2011 !psf->sf_count[MCAST_INCLUDE];
2012 } else
2013 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2014 if (new_in) {
2015 if (!psf->sf_oldin) {
e80e28b6 2016 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 2017
2018 for (dpsf=pmc->mca_tomb; dpsf;
2019 dpsf=dpsf->sf_next) {
2020 if (ipv6_addr_equal(&dpsf->sf_addr,
2021 &psf->sf_addr))
2022 break;
2023 prev = dpsf;
2024 }
2025 if (dpsf) {
2026 if (prev)
2027 prev->sf_next = dpsf->sf_next;
2028 else
2029 pmc->mca_tomb = dpsf->sf_next;
2030 kfree(dpsf);
2031 }
2032 psf->sf_crcount = qrv;
2033 rv++;
2034 }
2035 } else if (psf->sf_oldin) {
2036 psf->sf_crcount = 0;
2037 /*
2038 * add or update "delete" records if an active filter
2039 * is now inactive
2040 */
2041 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2042 if (ipv6_addr_equal(&dpsf->sf_addr,
2043 &psf->sf_addr))
2044 break;
2045 if (!dpsf) {
2046 dpsf = (struct ip6_sf_list *)
2047 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2048 if (!dpsf)
2049 continue;
2050 *dpsf = *psf;
2051 /* pmc->mca_lock held by callers */
2052 dpsf->sf_next = pmc->mca_tomb;
2053 pmc->mca_tomb = dpsf;
2054 }
2055 dpsf->sf_crcount = qrv;
1da177e4
LT		 2056 rv++;
2057 }
2058 }
2059 return rv;
2060}
2061
2062/*
2063 * Add multicast source filter list to the interface list
2064 */
2065static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2066 int sfmode, int sfcount, struct in6_addr *psfsrc,
2067 int delta)
2068{
2069 struct ifmcaddr6 *pmc;
2070 int isexclude;
2071 int i, err;
2072
2073 if (!idev)
2074 return -ENODEV;
2075 read_lock_bh(&idev->lock);
2076 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2077 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2078 break;
2079 }
2080 if (!pmc) {
2081 /* MCA not found?? bug */
2082 read_unlock_bh(&idev->lock);
2083 return -ESRCH;
2084 }
2085 spin_lock_bh(&pmc->mca_lock);
2086
2087 sf_markstate(pmc);
2088 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2089 if (!delta)
2090 pmc->mca_sfcount[sfmode]++;
2091 err = 0;
2092 for (i=0; i<sfcount; i++) {
2093 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2094 if (err)
2095 break;
2096 }
2097 if (err) {
2098 int j;
2099
2100 if (!delta)
2101 pmc->mca_sfcount[sfmode]--;
2102 for (j=0; j<i; j++)
2103 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2104 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2105 struct inet6_dev *idev = pmc->idev;
2106 struct ip6_sf_list *psf;
2107
2108 /* filter mode change */
2109 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2110 pmc->mca_sfmode = MCAST_EXCLUDE;
2111 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2112 pmc->mca_sfmode = MCAST_INCLUDE;
2113 /* else no filters; keep old mode for reports */
2114
2115 pmc->mca_crcount = idev->mc_qrv;
2116 idev->mc_ifc_count = pmc->mca_crcount;
2117 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2118 psf->sf_crcount = 0;
2119 mld_ifc_event(idev);
2120 } else if (sf_setstate(pmc))
2121 mld_ifc_event(idev);
2122 spin_unlock_bh(&pmc->mca_lock);
2123 read_unlock_bh(&idev->lock);
2124 return err;
2125}
2126
2127static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2128{
2129 struct ip6_sf_list *psf, *nextpsf;
2130
2131 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2132 nextpsf = psf->sf_next;
2133 kfree(psf);
2134 }
2135 pmc->mca_tomb = NULL;
2136 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2137 nextpsf = psf->sf_next;
2138 kfree(psf);
2139 }
2140 pmc->mca_sources = NULL;
2141 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2142 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2143 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2144}
2145
2146
2147static void igmp6_join_group(struct ifmcaddr6 *ma)
2148{
2149 unsigned long delay;
2150
2151 if (ma->mca_flags & MAF_NOREPORT)
2152 return;
2153
2154 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2155
2156 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2157
2158 spin_lock_bh(&ma->mca_lock);
2159 if (del_timer(&ma->mca_timer)) {
2160 atomic_dec(&ma->mca_refcnt);
2161 delay = ma->mca_timer.expires - jiffies;
2162 }
2163
2164 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2165 atomic_inc(&ma->mca_refcnt);
2166 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2167 spin_unlock_bh(&ma->mca_lock);
2168}
2169
2170static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2171 struct inet6_dev *idev)
2172{
2173 int err;
2174
5ab4a6c8
DS		 2175 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2176 * so no other readers or writers of iml or its sflist
2177 */
cfcabdcc 2178 if (!iml->sflist) {
1da177e4
LT		 2179 /* any-source empty exclude case */
2180 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2181 }
2182 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2183 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2184 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2185 iml->sflist = NULL;
2186 return err;
2187}
2188
2189static void igmp6_leave_group(struct ifmcaddr6 *ma)
2190{
2191 if (MLD_V1_SEEN(ma->idev)) {
2192 if (ma->mca_flags & MAF_LAST_REPORTER)
2193 igmp6_send(&ma->mca_addr, ma->idev->dev,
2194 ICMPV6_MGM_REDUCTION);
2195 } else {
2196 mld_add_delrec(ma->idev, ma);
2197 mld_ifc_event(ma->idev);
2198 }
2199}
2200
2201static void mld_gq_timer_expire(unsigned long data)
2202{
2203 struct inet6_dev *idev = (struct inet6_dev *)data;
2204
2205 idev->mc_gq_running = 0;
2206 mld_send_report(idev, NULL);
2207 __in6_dev_put(idev);
2208}
2209
2210static void mld_ifc_timer_expire(unsigned long data)
2211{
2212 struct inet6_dev *idev = (struct inet6_dev *)data;
2213
2214 mld_send_cr(idev);
2215 if (idev->mc_ifc_count) {
2216 idev->mc_ifc_count--;
2217 if (idev->mc_ifc_count)
2218 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2219 }
2220 __in6_dev_put(idev);
2221}
2222
2223static void mld_ifc_event(struct inet6_dev *idev)
2224{
2225 if (MLD_V1_SEEN(idev))
2226 return;
2227 idev->mc_ifc_count = idev->mc_qrv;
2228 mld_ifc_start_timer(idev, 1);
2229}
2230
2231
2232static void igmp6_timer_handler(unsigned long data)
2233{
2234 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2235
2236 if (MLD_V1_SEEN(ma->idev))
2237 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2238 else
2239 mld_send_report(ma->idev, ma);
2240
2241 spin_lock(&ma->mca_lock);
2242 ma->mca_flags |= MAF_LAST_REPORTER;
2243 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2244 spin_unlock(&ma->mca_lock);
2245 ma_put(ma);
2246}
2247
2248/* Device going down */
2249
2250void ipv6_mc_down(struct inet6_dev *idev)
2251{
2252 struct ifmcaddr6 *i;
2253
2254 /* Withdraw multicast list */
2255
2256 read_lock_bh(&idev->lock);
2257 idev->mc_ifc_count = 0;
2258 if (del_timer(&idev->mc_ifc_timer))
2259 __in6_dev_put(idev);
2260 idev->mc_gq_running = 0;
2261 if (del_timer(&idev->mc_gq_timer))
2262 __in6_dev_put(idev);
2263
2264 for (i = idev->mc_list; i; i=i->next)
2265 igmp6_group_dropped(i);
2266 read_unlock_bh(&idev->lock);
2267
2268 mld_clear_delrec(idev);
2269}
2270
2271
2272/* Device going up */
2273
2274void ipv6_mc_up(struct inet6_dev *idev)
2275{
2276 struct ifmcaddr6 *i;
2277
2278 /* Install multicast list, except for all-nodes (already installed) */
2279
2280 read_lock_bh(&idev->lock);
2281 for (i = idev->mc_list; i; i=i->next)
2282 igmp6_group_added(i);
2283 read_unlock_bh(&idev->lock);
2284}
2285
2286/* IPv6 device initialization. */
2287
2288void ipv6_mc_init_dev(struct inet6_dev *idev)
2289{
1da177e4
LT		 2290 write_lock_bh(&idev->lock);
2291 rwlock_init(&idev->mc_lock);
2292 idev->mc_gq_running = 0;
b24b8a24
PE		 2293 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2294 (unsigned long)idev);
1da177e4
LT		 2295 idev->mc_tomb = NULL;
2296 idev->mc_ifc_count = 0;
b24b8a24
PE		 2297 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2298 (unsigned long)idev);
1da177e4
LT		 2299 idev->mc_qrv = MLD_QRV_DEFAULT;
2300 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2301 idev->mc_v1_seen = 0;
2302 write_unlock_bh(&idev->lock);
1da177e4
LT		 2303}
2304
2305/*
2306 * Device is about to be destroyed: clean up.
2307 */
2308
2309void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2310{
2311 struct ifmcaddr6 *i;
2312 struct in6_addr maddr;
2313
2314 /* Deactivate timers */
2315 ipv6_mc_down(idev);
2316
2317 /* Delete all-nodes address. */
2318 ipv6_addr_all_nodes(&maddr);
2319
2320 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2321 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2322 * fail.
2323 */
2324 __ipv6_dev_mc_dec(idev, &maddr);
2325
2326 if (idev->cnf.forwarding) {
2327 ipv6_addr_all_routers(&maddr);
2328 __ipv6_dev_mc_dec(idev, &maddr);
2329 }
2330
2331 write_lock_bh(&idev->lock);
2332 while ((i = idev->mc_list) != NULL) {
2333 idev->mc_list = i->next;
2334 write_unlock_bh(&idev->lock);
2335
2336 igmp6_group_dropped(i);
2337 ma_put(i);
2338
2339 write_lock_bh(&idev->lock);
2340 }
2341 write_unlock_bh(&idev->lock);
2342}
2343
2344#ifdef CONFIG_PROC_FS
2345struct igmp6_mc_iter_state {
b8ad0cbc 2346 struct seq_net_private p;
1da177e4
LT		 2347 struct net_device *dev;
2348 struct inet6_dev *idev;
2349};
2350
2351#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2352
2353static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2354{
2355 struct ifmcaddr6 *im = NULL;
2356 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2357 struct net *net = seq_file_net(seq);
1da177e4 2358
7562f876 2359 state->idev = NULL;
b8ad0cbc 2360 for_each_netdev(net, state->dev) {
1da177e4
LT		 2361 struct inet6_dev *idev;
2362 idev = in6_dev_get(state->dev);
2363 if (!idev)
2364 continue;
2365 read_lock_bh(&idev->lock);
2366 im = idev->mc_list;
2367 if (im) {
2368 state->idev = idev;
2369 break;
2370 }
2371 read_unlock_bh(&idev->lock);
2372 in6_dev_put(idev);
2373 }
2374 return im;
2375}
2376
2377static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2378{
2379 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2380
2381 im = im->next;
2382 while (!im) {
2383 if (likely(state->idev != NULL)) {
2384 read_unlock_bh(&state->idev->lock);
2385 in6_dev_put(state->idev);
2386 }
7562f876 2387 state->dev = next_net_device(state->dev);
1da177e4
LT		 2388 if (!state->dev) {
2389 state->idev = NULL;
2390 break;
2391 }
2392 state->idev = in6_dev_get(state->dev);
2393 if (!state->idev)
2394 continue;
2395 read_lock_bh(&state->idev->lock);
2396 im = state->idev->mc_list;
2397 }
2398 return im;
2399}
2400
2401static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2402{
2403 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2404 if (im)
2405 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2406 --pos;
2407 return pos ? NULL : im;
2408}
2409
2410static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2411 __acquires(dev_base_lock)
1da177e4
LT		 2412{
2413 read_lock(&dev_base_lock);
2414 return igmp6_mc_get_idx(seq, *pos);
2415}
2416
2417static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2418{
2419 struct ifmcaddr6 *im;
2420 im = igmp6_mc_get_next(seq, v);
2421 ++*pos;
2422 return im;
2423}
2424
2425static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
9a429c49 2426 __releases(dev_base_lock)
1da177e4
LT		 2427{
2428 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2429 if (likely(state->idev != NULL)) {
2430 read_unlock_bh(&state->idev->lock);
2431 in6_dev_put(state->idev);
2432 state->idev = NULL;
2433 }
2434 state->dev = NULL;
2435 read_unlock(&dev_base_lock);
2436}
2437
2438static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2439{
2440 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2441 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2442
2443 seq_printf(seq,
1ab1457c 2444 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
1da177e4
LT		 2445 state->dev->ifindex, state->dev->name,
2446 NIP6(im->mca_addr),
2447 im->mca_users, im->mca_flags,
2448 (im->mca_flags&MAF_TIMER_RUNNING) ?
2449 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2450 return 0;
2451}
2452
56b3d975 2453static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2454 .start = igmp6_mc_seq_start,
2455 .next = igmp6_mc_seq_next,
2456 .stop = igmp6_mc_seq_stop,
2457 .show = igmp6_mc_seq_show,
2458};
2459
2460static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2461{
b8ad0cbc
DL		 2462 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2463 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2464}
2465
9a32144e 2466static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2467 .owner = THIS_MODULE,
2468 .open = igmp6_mc_seq_open,
2469 .read = seq_read,
2470 .llseek = seq_lseek,
b8ad0cbc 2471 .release = seq_release_net,
1da177e4
LT		 2472};
2473
2474struct igmp6_mcf_iter_state {
b8ad0cbc 2475 struct seq_net_private p;
1da177e4
LT		 2476 struct net_device *dev;
2477 struct inet6_dev *idev;
2478 struct ifmcaddr6 *im;
2479};
2480
2481#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2482
2483static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2484{
2485 struct ip6_sf_list *psf = NULL;
2486 struct ifmcaddr6 *im = NULL;
2487 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2488 struct net *net = seq_file_net(seq);
1da177e4 2489
7562f876
PE		 2490 state->idev = NULL;
2491 state->im = NULL;
b8ad0cbc 2492 for_each_netdev(net, state->dev) {
1da177e4
LT		 2493 struct inet6_dev *idev;
2494 idev = in6_dev_get(state->dev);
2495 if (unlikely(idev == NULL))
2496 continue;
2497 read_lock_bh(&idev->lock);
2498 im = idev->mc_list;
2499 if (likely(im != NULL)) {
2500 spin_lock_bh(&im->mca_lock);
2501 psf = im->mca_sources;
2502 if (likely(psf != NULL)) {
2503 state->im = im;
2504 state->idev = idev;
2505 break;
2506 }
2507 spin_unlock_bh(&im->mca_lock);
2508 }
2509 read_unlock_bh(&idev->lock);
2510 in6_dev_put(idev);
2511 }
2512 return psf;
2513}
2514
2515static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2516{
2517 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2518
2519 psf = psf->sf_next;
2520 while (!psf) {
2521 spin_unlock_bh(&state->im->mca_lock);
2522 state->im = state->im->next;
2523 while (!state->im) {
2524 if (likely(state->idev != NULL)) {
2525 read_unlock_bh(&state->idev->lock);
2526 in6_dev_put(state->idev);
2527 }
7562f876 2528 state->dev = next_net_device(state->dev);
1da177e4
LT		 2529 if (!state->dev) {
2530 state->idev = NULL;
2531 goto out;
2532 }
2533 state->idev = in6_dev_get(state->dev);
2534 if (!state->idev)
2535 continue;
2536 read_lock_bh(&state->idev->lock);
2537 state->im = state->idev->mc_list;
2538 }
2539 if (!state->im)
2540 break;
2541 spin_lock_bh(&state->im->mca_lock);
2542 psf = state->im->mca_sources;
2543 }
2544out:
2545 return psf;
2546}
2547
2548static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2549{
2550 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2551 if (psf)
2552 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2553 --pos;
2554 return pos ? NULL : psf;
2555}
2556
2557static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2558 __acquires(dev_base_lock)
1da177e4
LT		 2559{
2560 read_lock(&dev_base_lock);
2561 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2562}
2563
2564static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2565{
2566 struct ip6_sf_list *psf;
2567 if (v == SEQ_START_TOKEN)
2568 psf = igmp6_mcf_get_first(seq);
2569 else
2570 psf = igmp6_mcf_get_next(seq, v);
2571 ++*pos;
2572 return psf;
2573}
2574
2575static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
9a429c49 2576 __releases(dev_base_lock)
1da177e4
LT		 2577{
2578 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2579 if (likely(state->im != NULL)) {
2580 spin_unlock_bh(&state->im->mca_lock);
2581 state->im = NULL;
2582 }
2583 if (likely(state->idev != NULL)) {
2584 read_unlock_bh(&state->idev->lock);
2585 in6_dev_put(state->idev);
2586 state->idev = NULL;
2587 }
2588 state->dev = NULL;
2589 read_unlock(&dev_base_lock);
2590}
2591
2592static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2593{
2594 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2595 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2596
2597 if (v == SEQ_START_TOKEN) {
1ab1457c 2598 seq_printf(seq,
1da177e4 2599 "%3s %6s "
9343e79a 2600 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2601 "Device", "Multicast Address",
2602 "Source Address", "INC", "EXC");
2603 } else {
2604 seq_printf(seq,
9343e79a 2605 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
1da177e4
LT		 2606 state->dev->ifindex, state->dev->name,
2607 NIP6(state->im->mca_addr),
2608 NIP6(psf->sf_addr),
2609 psf->sf_count[MCAST_INCLUDE],
2610 psf->sf_count[MCAST_EXCLUDE]);
2611 }
2612 return 0;
2613}
2614
56b3d975 2615static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2616 .start = igmp6_mcf_seq_start,
2617 .next = igmp6_mcf_seq_next,
2618 .stop = igmp6_mcf_seq_stop,
2619 .show = igmp6_mcf_seq_show,
2620};
2621
2622static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2623{
b8ad0cbc
DL		 2624 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2625 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2626}
2627
9a32144e 2628static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2629 .owner = THIS_MODULE,
2630 .open = igmp6_mcf_seq_open,
2631 .read = seq_read,
2632 .llseek = seq_lseek,
b8ad0cbc 2633 .release = seq_release_net,
1da177e4 2634};
ea82edf7
DL		 2635
2636static int igmp6_proc_init(struct net *net)
2637{
2638 int err;
2639
2640 err = -ENOMEM;
2641 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2642 goto out;
2643 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2644 &igmp6_mcf_seq_fops))
2645 goto out_proc_net_igmp6;
2646
2647 err = 0;
2648out:
2649 return err;
2650
2651out_proc_net_igmp6:
2652 proc_net_remove(net, "igmp6");
2653 goto out;
2654}
2655
2656static void igmp6_proc_exit(struct net *net)
2657{
2658 proc_net_remove(net, "mcfilter6");
2659 proc_net_remove(net, "igmp6");
2660}
2661#else
2662static int igmp6_proc_init(struct net *net)
2663{
2664 return 0;
2665}
2666static void igmp6_proc_exit(struct net *net)
2667{
2668 ;
2669}
1da177e4
LT		 2670#endif
2671
b8ad0cbc 2672static int igmp6_net_init(struct net *net)
1da177e4 2673{
1da177e4
LT		 2674 int err;
2675
1ed8516f
DL		 2676 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2677 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 2678 if (err < 0) {
2679 printk(KERN_ERR
2680 "Failed to initialize the IGMP6 control socket (err %d).\n",
2681 err);
b8ad0cbc 2682 goto out;
1da177e4
LT		 2683 }
2684
1ed8516f 2685 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2686
ea82edf7
DL		 2687 err = igmp6_proc_init(net);
2688 if (err)
b8ad0cbc 2689 goto out_sock_create;
b8ad0cbc
DL		 2690out:
2691 return err;
2692
2693out_sock_create:
1ed8516f 2694 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2695 goto out;
1da177e4
LT		 2696}
2697
b8ad0cbc 2698static void igmp6_net_exit(struct net *net)
1da177e4 2699{
1ed8516f 2700 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2701 igmp6_proc_exit(net);
1da177e4 2702}
b8ad0cbc
DL		 2703
2704static struct pernet_operations igmp6_net_ops = {
2705 .init = igmp6_net_init,
2706 .exit = igmp6_net_exit,
2707};
2708
2709int __init igmp6_init(void)
2710{
2711 return register_pernet_subsys(&igmp6_net_ops);
2712}
2713
2714void igmp6_cleanup(void)
2715{
2716 unregister_pernet_subsys(&igmp6_net_ops);
2717}
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