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[NET] NETNS: Omit net_device->nd_net without CONFIG_NET_NS.
[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>
62
63#include <net/ip6_checksum.h>
64
65/* Set to 3 to get tracing... */
66#define MCAST_DEBUG 2
67
68#if MCAST_DEBUG >= 3
69#define MDBG(x) printk x
70#else
71#define MDBG(x)
72#endif
73
74/*
75 * These header formats should be in a separate include file, but icmpv6.h
76 * doesn't have in6_addr defined in all cases, there is no __u128, and no
77 * other files reference these.
78 *
79 * +-DLS 4/14/03
80 */
81
82/* Multicast Listener Discovery version 2 headers */
83
84struct mld2_grec {
85 __u8 grec_type;
86 __u8 grec_auxwords;
8a74ff77 87 __be16 grec_nsrcs;
1da177e4
LT		 88 struct in6_addr grec_mca;
89 struct in6_addr grec_src[0];
90};
91
92struct mld2_report {
93 __u8 type;
94 __u8 resv1;
868c86bc 95 __sum16 csum;
8a74ff77
AV		 96 __be16 resv2;
97 __be16 ngrec;
1da177e4
LT		 98 struct mld2_grec grec[0];
99};
100
101struct mld2_query {
102 __u8 type;
103 __u8 code;
868c86bc 104 __sum16 csum;
8a74ff77
AV		 105 __be16 mrc;
106 __be16 resv1;
1da177e4
LT		 107 struct in6_addr mca;
108#if defined(__LITTLE_ENDIAN_BITFIELD)
109 __u8 qrv:3,
110 suppress:1,
111 resv2:4;
112#elif defined(__BIG_ENDIAN_BITFIELD)
113 __u8 resv2:4,
114 suppress:1,
115 qrv:3;
116#else
117#error "Please fix <asm/byteorder.h>"
118#endif
119 __u8 qqic;
8a74ff77 120 __be16 nsrcs;
1da177e4
LT		 121 struct in6_addr srcs[0];
122};
123
124static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
125
126/* Big mc list lock for all the sockets */
127static DEFINE_RWLOCK(ipv6_sk_mc_lock);
128
1da177e4
LT		 129int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
130
131static void igmp6_join_group(struct ifmcaddr6 *ma);
132static void igmp6_leave_group(struct ifmcaddr6 *ma);
133static void igmp6_timer_handler(unsigned long data);
134
135static void mld_gq_timer_expire(unsigned long data);
136static void mld_ifc_timer_expire(unsigned long data);
137static void mld_ifc_event(struct inet6_dev *idev);
138static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
139static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
140static void mld_clear_delrec(struct inet6_dev *idev);
141static int sf_setstate(struct ifmcaddr6 *pmc);
142static void sf_markstate(struct ifmcaddr6 *pmc);
143static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
144static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
145 int sfmode, int sfcount, struct in6_addr *psfsrc,
146 int delta);
147static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
148 int sfmode, int sfcount, struct in6_addr *psfsrc,
149 int delta);
150static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
151 struct inet6_dev *idev);
152
153
154#define IGMP6_UNSOLICITED_IVAL (10*HZ)
155#define MLD_QRV_DEFAULT 2
156
157#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
158 (idev)->cnf.force_mld_version == 1 || \
159 ((idev)->mc_v1_seen && \
160 time_before(jiffies, (idev)->mc_v1_seen)))
161
162#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
163#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
164 ((value) < (thresh) ? (value) : \
f12baeab 165 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
1da177e4
LT		 166 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
167
168#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
169#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
170
6f4353d8 171#define IPV6_MLD_MAX_MSF 64
1da177e4 172
ab32ea5d 173int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 174
175/*
176 * socket join on multicast group
177 */
178
179int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
180{
181 struct net_device *dev = NULL;
182 struct ipv6_mc_socklist *mc_lst;
183 struct ipv6_pinfo *np = inet6_sk(sk);
b8ad0cbc 184 struct net *net = sk->sk_net;
1da177e4
LT		 185 int err;
186
187 if (!ipv6_addr_is_multicast(addr))
188 return -EINVAL;
189
c9e3e8b6
DS		 190 read_lock_bh(&ipv6_sk_mc_lock);
191 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
192 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
193 ipv6_addr_equal(&mc_lst->addr, addr)) {
194 read_unlock_bh(&ipv6_sk_mc_lock);
195 return -EADDRINUSE;
196 }
197 }
198 read_unlock_bh(&ipv6_sk_mc_lock);
199
1da177e4
LT		 200 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
201
202 if (mc_lst == NULL)
203 return -ENOMEM;
204
205 mc_lst->next = NULL;
206 ipv6_addr_copy(&mc_lst->addr, addr);
207
208 if (ifindex == 0) {
209 struct rt6_info *rt;
b8ad0cbc 210 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4
LT		 211 if (rt) {
212 dev = rt->rt6i_dev;
213 dev_hold(dev);
214 dst_release(&rt->u.dst);
215 }
216 } else
b8ad0cbc 217 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 218
219 if (dev == NULL) {
220 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
221 return -ENODEV;
222 }
223
224 mc_lst->ifindex = dev->ifindex;
225 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 226 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 227 mc_lst->sflist = NULL;
228
229 /*
230 * now add/increase the group membership on the device
231 */
232
233 err = ipv6_dev_mc_inc(dev, addr);
234
235 if (err) {
236 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
237 dev_put(dev);
238 return err;
239 }
240
241 write_lock_bh(&ipv6_sk_mc_lock);
242 mc_lst->next = np->ipv6_mc_list;
243 np->ipv6_mc_list = mc_lst;
244 write_unlock_bh(&ipv6_sk_mc_lock);
245
246 dev_put(dev);
247
248 return 0;
249}
250
251/*
252 * socket leave on multicast group
253 */
254int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
255{
256 struct ipv6_pinfo *np = inet6_sk(sk);
257 struct ipv6_mc_socklist *mc_lst, **lnk;
b8ad0cbc 258 struct net *net = sk->sk_net;
1da177e4
LT		 259
260 write_lock_bh(&ipv6_sk_mc_lock);
261 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
262 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
263 ipv6_addr_equal(&mc_lst->addr, addr)) {
264 struct net_device *dev;
265
266 *lnk = mc_lst->next;
267 write_unlock_bh(&ipv6_sk_mc_lock);
268
b8ad0cbc
DL		 269 dev = dev_get_by_index(net, mc_lst->ifindex);
270 if (dev != NULL) {
1da177e4
LT		 271 struct inet6_dev *idev = in6_dev_get(dev);
272
acd6e00b 273 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 274 if (idev) {
1da177e4
LT		 275 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
276 in6_dev_put(idev);
277 }
278 dev_put(dev);
acd6e00b
DS		 279 } else
280 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 281 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
282 return 0;
283 }
284 }
285 write_unlock_bh(&ipv6_sk_mc_lock);
286
9951f036 287 return -EADDRNOTAVAIL;
1da177e4
LT		 288}
289
b8ad0cbc
DL		 290static struct inet6_dev *ip6_mc_find_dev(struct net *net,
291 struct in6_addr *group,
292 int ifindex)
1da177e4
LT		 293{
294 struct net_device *dev = NULL;
295 struct inet6_dev *idev = NULL;
296
297 if (ifindex == 0) {
298 struct rt6_info *rt;
299
b8ad0cbc 300 rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4
LT		 301 if (rt) {
302 dev = rt->rt6i_dev;
303 dev_hold(dev);
304 dst_release(&rt->u.dst);
305 }
306 } else
b8ad0cbc 307 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 308
309 if (!dev)
310 return NULL;
311 idev = in6_dev_get(dev);
312 if (!idev) {
313 dev_put(dev);
314 return NULL;
315 }
316 read_lock_bh(&idev->lock);
317 if (idev->dead) {
318 read_unlock_bh(&idev->lock);
319 in6_dev_put(idev);
320 dev_put(dev);
321 return NULL;
322 }
323 return idev;
324}
325
326void ipv6_sock_mc_close(struct sock *sk)
327{
328 struct ipv6_pinfo *np = inet6_sk(sk);
329 struct ipv6_mc_socklist *mc_lst;
b8ad0cbc 330 struct net *net = sk->sk_net;
1da177e4
LT		 331
332 write_lock_bh(&ipv6_sk_mc_lock);
333 while ((mc_lst = np->ipv6_mc_list) != NULL) {
334 struct net_device *dev;
335
336 np->ipv6_mc_list = mc_lst->next;
337 write_unlock_bh(&ipv6_sk_mc_lock);
338
b8ad0cbc 339 dev = dev_get_by_index(net, mc_lst->ifindex);
1da177e4
LT		 340 if (dev) {
341 struct inet6_dev *idev = in6_dev_get(dev);
342
acd6e00b 343 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 344 if (idev) {
1da177e4
LT		 345 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
346 in6_dev_put(idev);
347 }
348 dev_put(dev);
acd6e00b
DS		 349 } else
350 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 351
352 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
353
354 write_lock_bh(&ipv6_sk_mc_lock);
355 }
356 write_unlock_bh(&ipv6_sk_mc_lock);
357}
358
359int ip6_mc_source(int add, int omode, struct sock *sk,
360 struct group_source_req *pgsr)
361{
362 struct in6_addr *source, *group;
363 struct ipv6_mc_socklist *pmc;
364 struct net_device *dev;
365 struct inet6_dev *idev;
366 struct ipv6_pinfo *inet6 = inet6_sk(sk);
367 struct ip6_sf_socklist *psl;
b8ad0cbc 368 struct net *net = sk->sk_net;
1da177e4 369 int i, j, rv;
c9e3e8b6 370 int leavegroup = 0;
5ab4a6c8 371 int pmclocked = 0;
1da177e4
LT		 372 int err;
373
374 if (pgsr->gsr_group.ss_family != AF_INET6 ||
375 pgsr->gsr_source.ss_family != AF_INET6)
376 return -EINVAL;
377
378 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
379 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
380
381 if (!ipv6_addr_is_multicast(group))
382 return -EINVAL;
383
b8ad0cbc 384 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
1da177e4
LT		 385 if (!idev)
386 return -ENODEV;
387 dev = idev->dev;
388
389 err = -EADDRNOTAVAIL;
390
c9e3e8b6 391 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 392 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
393 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
394 continue;
395 if (ipv6_addr_equal(&pmc->addr, group))
396 break;
397 }
917f2f10
DS		 398 if (!pmc) { /* must have a prior join */
399 err = -EINVAL;
1da177e4 400 goto done;
917f2f10 401 }
1da177e4
LT		 402 /* if a source filter was set, must be the same mode as before */
403 if (pmc->sflist) {
917f2f10
DS		 404 if (pmc->sfmode != omode) {
405 err = -EINVAL;
1da177e4 406 goto done;
917f2f10 407 }
1da177e4
LT		 408 } else if (pmc->sfmode != omode) {
409 /* allow mode switches for empty-set filters */
410 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
411 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
412 pmc->sfmode = omode;
413 }
414
5ab4a6c8
DS		 415 write_lock_bh(&pmc->sflock);
416 pmclocked = 1;
417
1da177e4
LT		 418 psl = pmc->sflist;
419 if (!add) {
420 if (!psl)
917f2f10 421 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 422 rv = !0;
423 for (i=0; i<psl->sl_count; i++) {
424 rv = memcmp(&psl->sl_addr[i], source,
425 sizeof(struct in6_addr));
426 if (rv == 0)
427 break;
428 }
429 if (rv) /* source not found */
917f2f10 430 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 431
c9e3e8b6
DS		 432 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
433 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
434 leavegroup = 1;
435 goto done;
436 }
437
1da177e4
LT		 438 /* update the interface filter */
439 ip6_mc_del_src(idev, group, omode, 1, source, 1);
440
441 for (j=i+1; j<psl->sl_count; j++)
442 psl->sl_addr[j-1] = psl->sl_addr[j];
443 psl->sl_count--;
444 err = 0;
445 goto done;
446 }
447 /* else, add a new source to the filter */
448
449 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
450 err = -ENOBUFS;
451 goto done;
452 }
453 if (!psl || psl->sl_count == psl->sl_max) {
454 struct ip6_sf_socklist *newpsl;
455 int count = IP6_SFBLOCK;
456
457 if (psl)
458 count += psl->sl_max;
8b3a7005 459 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 460 if (!newpsl) {
461 err = -ENOBUFS;
462 goto done;
463 }
464 newpsl->sl_max = count;
465 newpsl->sl_count = count - IP6_SFBLOCK;
466 if (psl) {
467 for (i=0; i<psl->sl_count; i++)
468 newpsl->sl_addr[i] = psl->sl_addr[i];
469 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
470 }
471 pmc->sflist = psl = newpsl;
472 }
473 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
474 for (i=0; i<psl->sl_count; i++) {
475 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
476 if (rv == 0)
477 break;
478 }
479 if (rv == 0) /* address already there is an error */
480 goto done;
481 for (j=psl->sl_count-1; j>=i; j--)
482 psl->sl_addr[j+1] = psl->sl_addr[j];
483 psl->sl_addr[i] = *source;
484 psl->sl_count++;
485 err = 0;
486 /* update the interface list */
487 ip6_mc_add_src(idev, group, omode, 1, source, 1);
488done:
5ab4a6c8
DS		 489 if (pmclocked)
490 write_unlock_bh(&pmc->sflock);
c9e3e8b6 491 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 492 read_unlock_bh(&idev->lock);
493 in6_dev_put(idev);
494 dev_put(dev);
c9e3e8b6
DS		 495 if (leavegroup)
496 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 497 return err;
498}
499
500int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
501{
502 struct in6_addr *group;
503 struct ipv6_mc_socklist *pmc;
504 struct net_device *dev;
505 struct inet6_dev *idev;
506 struct ipv6_pinfo *inet6 = inet6_sk(sk);
507 struct ip6_sf_socklist *newpsl, *psl;
b8ad0cbc 508 struct net *net = sk->sk_net;
9951f036 509 int leavegroup = 0;
1da177e4
LT		 510 int i, err;
511
512 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
513
514 if (!ipv6_addr_is_multicast(group))
515 return -EINVAL;
516 if (gsf->gf_fmode != MCAST_INCLUDE &&
517 gsf->gf_fmode != MCAST_EXCLUDE)
518 return -EINVAL;
519
b8ad0cbc 520 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 521
522 if (!idev)
523 return -ENODEV;
524 dev = idev->dev;
1da177e4 525
9c05989b 526 err = 0;
5ab4a6c8
DS		 527 read_lock_bh(&ipv6_sk_mc_lock);
528
9951f036
DS		 529 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
530 leavegroup = 1;
531 goto done;
532 }
533
1da177e4
LT		 534 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
535 if (pmc->ifindex != gsf->gf_interface)
536 continue;
537 if (ipv6_addr_equal(&pmc->addr, group))
538 break;
539 }
917f2f10
DS		 540 if (!pmc) { /* must have a prior join */
541 err = -EINVAL;
1da177e4 542 goto done;
917f2f10 543 }
1da177e4 544 if (gsf->gf_numsrc) {
8b3a7005
KK		 545 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
546 GFP_ATOMIC);
1da177e4
LT		 547 if (!newpsl) {
548 err = -ENOBUFS;
549 goto done;
550 }
551 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
552 for (i=0; i<newpsl->sl_count; ++i) {
553 struct sockaddr_in6 *psin6;
554
555 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
556 newpsl->sl_addr[i] = psin6->sin6_addr;
557 }
558 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
559 newpsl->sl_count, newpsl->sl_addr, 0);
560 if (err) {
561 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
562 goto done;
563 }
8713dbf0 564 } else {
1da177e4 565 newpsl = NULL;
8713dbf0
YZ		 566 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
567 }
5ab4a6c8
DS		 568
569 write_lock_bh(&pmc->sflock);
1da177e4
LT		 570 psl = pmc->sflist;
571 if (psl) {
572 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
573 psl->sl_count, psl->sl_addr, 0);
574 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
575 } else
576 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
577 pmc->sflist = newpsl;
578 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 579 write_unlock_bh(&pmc->sflock);
917f2f10 580 err = 0;
1da177e4 581done:
5ab4a6c8 582 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 583 read_unlock_bh(&idev->lock);
584 in6_dev_put(idev);
585 dev_put(dev);
9951f036
DS		 586 if (leavegroup)
587 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 588 return err;
589}
590
591int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
592 struct group_filter __user *optval, int __user *optlen)
593{
594 int err, i, count, copycount;
595 struct in6_addr *group;
596 struct ipv6_mc_socklist *pmc;
597 struct inet6_dev *idev;
598 struct net_device *dev;
599 struct ipv6_pinfo *inet6 = inet6_sk(sk);
600 struct ip6_sf_socklist *psl;
b8ad0cbc 601 struct net *net = sk->sk_net;
1da177e4
LT		 602
603 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
604
605 if (!ipv6_addr_is_multicast(group))
606 return -EINVAL;
607
b8ad0cbc 608 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 609
610 if (!idev)
611 return -ENODEV;
612
613 dev = idev->dev;
614
615 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 616 /*
617 * changes to the ipv6_mc_list require the socket lock and
618 * a read lock on ip6_sk_mc_lock. We have the socket lock,
619 * so reading the list is safe.
620 */
1da177e4
LT		 621
622 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
623 if (pmc->ifindex != gsf->gf_interface)
624 continue;
625 if (ipv6_addr_equal(group, &pmc->addr))
626 break;
627 }
628 if (!pmc) /* must have a prior join */
629 goto done;
630 gsf->gf_fmode = pmc->sfmode;
631 psl = pmc->sflist;
632 count = psl ? psl->sl_count : 0;
633 read_unlock_bh(&idev->lock);
634 in6_dev_put(idev);
635 dev_put(dev);
636
637 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
638 gsf->gf_numsrc = count;
639 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
640 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
641 return -EFAULT;
642 }
5ab4a6c8
DS		 643 /* changes to psl require the socket lock, a read lock on
644 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
645 * have the socket lock, so reading here is safe.
646 */
1da177e4
LT		 647 for (i=0; i<copycount; i++) {
648 struct sockaddr_in6 *psin6;
649 struct sockaddr_storage ss;
650
651 psin6 = (struct sockaddr_in6 *)&ss;
652 memset(&ss, 0, sizeof(ss));
653 psin6->sin6_family = AF_INET6;
654 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 655 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 656 return -EFAULT;
657 }
658 return 0;
659done:
660 read_unlock_bh(&idev->lock);
661 in6_dev_put(idev);
662 dev_put(dev);
663 return err;
664}
665
666int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
667 struct in6_addr *src_addr)
668{
669 struct ipv6_pinfo *np = inet6_sk(sk);
670 struct ipv6_mc_socklist *mc;
671 struct ip6_sf_socklist *psl;
672 int rv = 1;
673
674 read_lock(&ipv6_sk_mc_lock);
675 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
676 if (ipv6_addr_equal(&mc->addr, mc_addr))
677 break;
678 }
679 if (!mc) {
680 read_unlock(&ipv6_sk_mc_lock);
681 return 1;
682 }
5ab4a6c8 683 read_lock(&mc->sflock);
1da177e4
LT		 684 psl = mc->sflist;
685 if (!psl) {
686 rv = mc->sfmode == MCAST_EXCLUDE;
687 } else {
688 int i;
689
690 for (i=0; i<psl->sl_count; i++) {
691 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
692 break;
693 }
694 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
695 rv = 0;
696 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
697 rv = 0;
698 }
5ab4a6c8 699 read_unlock(&mc->sflock);
1da177e4
LT		 700 read_unlock(&ipv6_sk_mc_lock);
701
702 return rv;
703}
704
705static void ma_put(struct ifmcaddr6 *mc)
706{
707 if (atomic_dec_and_test(&mc->mca_refcnt)) {
708 in6_dev_put(mc->idev);
709 kfree(mc);
710 }
711}
712
713static void igmp6_group_added(struct ifmcaddr6 *mc)
714{
715 struct net_device *dev = mc->idev->dev;
716 char buf[MAX_ADDR_LEN];
717
718 spin_lock_bh(&mc->mca_lock);
719 if (!(mc->mca_flags&MAF_LOADED)) {
720 mc->mca_flags |= MAF_LOADED;
721 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
722 dev_mc_add(dev, buf, dev->addr_len, 0);
723 }
724 spin_unlock_bh(&mc->mca_lock);
725
726 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
727 return;
728
729 if (MLD_V1_SEEN(mc->idev)) {
730 igmp6_join_group(mc);
731 return;
732 }
733 /* else v2 */
734
735 mc->mca_crcount = mc->idev->mc_qrv;
736 mld_ifc_event(mc->idev);
737}
738
739static void igmp6_group_dropped(struct ifmcaddr6 *mc)
740{
741 struct net_device *dev = mc->idev->dev;
742 char buf[MAX_ADDR_LEN];
743
744 spin_lock_bh(&mc->mca_lock);
745 if (mc->mca_flags&MAF_LOADED) {
746 mc->mca_flags &= ~MAF_LOADED;
747 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
748 dev_mc_delete(dev, buf, dev->addr_len, 0);
749 }
750
751 if (mc->mca_flags & MAF_NOREPORT)
752 goto done;
753 spin_unlock_bh(&mc->mca_lock);
754
755 if (!mc->idev->dead)
756 igmp6_leave_group(mc);
757
758 spin_lock_bh(&mc->mca_lock);
759 if (del_timer(&mc->mca_timer))
760 atomic_dec(&mc->mca_refcnt);
761done:
762 ip6_mc_clear_src(mc);
763 spin_unlock_bh(&mc->mca_lock);
764}
765
766/*
767 * deleted ifmcaddr6 manipulation
768 */
769static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
770{
771 struct ifmcaddr6 *pmc;
772
773 /* this is an "ifmcaddr6" for convenience; only the fields below
774 * are actually used. In particular, the refcnt and users are not
775 * used for management of the delete list. Using the same structure
776 * for deleted items allows change reports to use common code with
777 * non-deleted or query-response MCA's.
778 */
0c600eda 779 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 780 if (!pmc)
781 return;
0c600eda 782
1da177e4
LT		 783 spin_lock_bh(&im->mca_lock);
784 spin_lock_init(&pmc->mca_lock);
785 pmc->idev = im->idev;
786 in6_dev_hold(idev);
787 pmc->mca_addr = im->mca_addr;
788 pmc->mca_crcount = idev->mc_qrv;
789 pmc->mca_sfmode = im->mca_sfmode;
790 if (pmc->mca_sfmode == MCAST_INCLUDE) {
791 struct ip6_sf_list *psf;
792
793 pmc->mca_tomb = im->mca_tomb;
794 pmc->mca_sources = im->mca_sources;
795 im->mca_tomb = im->mca_sources = NULL;
796 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
797 psf->sf_crcount = pmc->mca_crcount;
798 }
799 spin_unlock_bh(&im->mca_lock);
800
801 write_lock_bh(&idev->mc_lock);
802 pmc->next = idev->mc_tomb;
803 idev->mc_tomb = pmc;
804 write_unlock_bh(&idev->mc_lock);
805}
806
807static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
808{
809 struct ifmcaddr6 *pmc, *pmc_prev;
810 struct ip6_sf_list *psf, *psf_next;
811
812 write_lock_bh(&idev->mc_lock);
813 pmc_prev = NULL;
814 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
815 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
816 break;
817 pmc_prev = pmc;
818 }
819 if (pmc) {
820 if (pmc_prev)
821 pmc_prev->next = pmc->next;
822 else
823 idev->mc_tomb = pmc->next;
824 }
825 write_unlock_bh(&idev->mc_lock);
826 if (pmc) {
827 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
828 psf_next = psf->sf_next;
829 kfree(psf);
830 }
831 in6_dev_put(pmc->idev);
832 kfree(pmc);
833 }
834}
835
836static void mld_clear_delrec(struct inet6_dev *idev)
837{
838 struct ifmcaddr6 *pmc, *nextpmc;
839
840 write_lock_bh(&idev->mc_lock);
841 pmc = idev->mc_tomb;
842 idev->mc_tomb = NULL;
843 write_unlock_bh(&idev->mc_lock);
844
845 for (; pmc; pmc = nextpmc) {
846 nextpmc = pmc->next;
847 ip6_mc_clear_src(pmc);
848 in6_dev_put(pmc->idev);
849 kfree(pmc);
850 }
851
852 /* clear dead sources, too */
853 read_lock_bh(&idev->lock);
854 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
855 struct ip6_sf_list *psf, *psf_next;
856
857 spin_lock_bh(&pmc->mca_lock);
858 psf = pmc->mca_tomb;
859 pmc->mca_tomb = NULL;
860 spin_unlock_bh(&pmc->mca_lock);
861 for (; psf; psf=psf_next) {
862 psf_next = psf->sf_next;
863 kfree(psf);
864 }
865 }
866 read_unlock_bh(&idev->lock);
867}
868
869
870/*
871 * device multicast group inc (add if not found)
872 */
873int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
874{
875 struct ifmcaddr6 *mc;
876 struct inet6_dev *idev;
877
878 idev = in6_dev_get(dev);
879
880 if (idev == NULL)
881 return -EINVAL;
882
883 write_lock_bh(&idev->lock);
884 if (idev->dead) {
885 write_unlock_bh(&idev->lock);
886 in6_dev_put(idev);
887 return -ENODEV;
888 }
889
890 for (mc = idev->mc_list; mc; mc = mc->next) {
891 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
892 mc->mca_users++;
893 write_unlock_bh(&idev->lock);
894 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
895 NULL, 0);
896 in6_dev_put(idev);
897 return 0;
898 }
899 }
900
901 /*
902 * not found: create a new one.
903 */
904
0c600eda 905 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 906
907 if (mc == NULL) {
908 write_unlock_bh(&idev->lock);
909 in6_dev_put(idev);
910 return -ENOMEM;
911 }
912
b24b8a24 913 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4
LT		 914
915 ipv6_addr_copy(&mc->mca_addr, addr);
916 mc->idev = idev;
917 mc->mca_users = 1;
918 /* mca_stamp should be updated upon changes */
919 mc->mca_cstamp = mc->mca_tstamp = jiffies;
920 atomic_set(&mc->mca_refcnt, 2);
921 spin_lock_init(&mc->mca_lock);
922
923 /* initial mode is (EX, empty) */
924 mc->mca_sfmode = MCAST_EXCLUDE;
925 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
926
927 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
928 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
929 mc->mca_flags |= MAF_NOREPORT;
930
931 mc->next = idev->mc_list;
932 idev->mc_list = mc;
933 write_unlock_bh(&idev->lock);
934
935 mld_del_delrec(idev, &mc->mca_addr);
936 igmp6_group_added(mc);
937 ma_put(mc);
938 return 0;
939}
940
941/*
942 * device multicast group del
943 */
944int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
945{
946 struct ifmcaddr6 *ma, **map;
947
948 write_lock_bh(&idev->lock);
949 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
950 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
951 if (--ma->mca_users == 0) {
952 *map = ma->next;
953 write_unlock_bh(&idev->lock);
954
955 igmp6_group_dropped(ma);
956
957 ma_put(ma);
958 return 0;
959 }
960 write_unlock_bh(&idev->lock);
961 return 0;
962 }
963 }
964 write_unlock_bh(&idev->lock);
965
966 return -ENOENT;
967}
968
969int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
970{
971 struct inet6_dev *idev = in6_dev_get(dev);
972 int err;
973
974 if (!idev)
975 return -ENODEV;
976
977 err = __ipv6_dev_mc_dec(idev, addr);
978
979 in6_dev_put(idev);
980
981 return err;
982}
983
984/*
985 * identify MLD packets for MLD filter exceptions
986 */
987int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
988{
989 struct icmp6hdr *pic;
990
991 if (nexthdr != IPPROTO_ICMPV6)
992 return 0;
993
994 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
995 return 0;
996
cc70ab26 997 pic = icmp6_hdr(skb);
1da177e4
LT		 998
999 switch (pic->icmp6_type) {
1000 case ICMPV6_MGM_QUERY:
1001 case ICMPV6_MGM_REPORT:
1002 case ICMPV6_MGM_REDUCTION:
1003 case ICMPV6_MLD2_REPORT:
1004 return 1;
1005 default:
1006 break;
1007 }
1008 return 0;
1009}
1010
1011/*
1012 * check if the interface/address pair is valid
1013 */
1014int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1015 struct in6_addr *src_addr)
1016{
1017 struct inet6_dev *idev;
1018 struct ifmcaddr6 *mc;
1019 int rv = 0;
1020
1021 idev = in6_dev_get(dev);
1022 if (idev) {
1023 read_lock_bh(&idev->lock);
1024 for (mc = idev->mc_list; mc; mc=mc->next) {
1025 if (ipv6_addr_equal(&mc->mca_addr, group))
1026 break;
1027 }
1028 if (mc) {
1029 if (src_addr && !ipv6_addr_any(src_addr)) {
1030 struct ip6_sf_list *psf;
1031
1032 spin_lock_bh(&mc->mca_lock);
1033 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1034 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1035 break;
1036 }
1037 if (psf)
1038 rv = psf->sf_count[MCAST_INCLUDE] ||
1039 psf->sf_count[MCAST_EXCLUDE] !=
1040 mc->mca_sfcount[MCAST_EXCLUDE];
1041 else
1042 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1043 spin_unlock_bh(&mc->mca_lock);
1044 } else
1045 rv = 1; /* don't filter unspecified source */
1046 }
1047 read_unlock_bh(&idev->lock);
1048 in6_dev_put(idev);
1049 }
1050 return rv;
1051}
1052
1053static void mld_gq_start_timer(struct inet6_dev *idev)
1054{
1055 int tv = net_random() % idev->mc_maxdelay;
1056
1057 idev->mc_gq_running = 1;
1058 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1059 in6_dev_hold(idev);
1060}
1061
1062static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1063{
1064 int tv = net_random() % delay;
1065
1066 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1067 in6_dev_hold(idev);
1068}
1069
1070/*
1071 * IGMP handling (alias multicast ICMPv6 messages)
1072 */
1073
1074static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1075{
1076 unsigned long delay = resptime;
1077
1078 /* Do not start timer for these addresses */
1079 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1080 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1081 return;
1082
1083 if (del_timer(&ma->mca_timer)) {
1084 atomic_dec(&ma->mca_refcnt);
1085 delay = ma->mca_timer.expires - jiffies;
1086 }
1087
1088 if (delay >= resptime) {
1089 if (resptime)
1090 delay = net_random() % resptime;
1091 else
1092 delay = 1;
1093 }
1094 ma->mca_timer.expires = jiffies + delay;
1095 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1096 atomic_inc(&ma->mca_refcnt);
1097 ma->mca_flags |= MAF_TIMER_RUNNING;
1098}
1099
5ab4a6c8
DS		 1100/* mark EXCLUDE-mode sources */
1101static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1102 struct in6_addr *srcs)
1103{
1104 struct ip6_sf_list *psf;
1105 int i, scount;
1106
1107 scount = 0;
1108 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1109 if (scount == nsrcs)
1110 break;
5ab4a6c8
DS		 1111 for (i=0; i<nsrcs; i++) {
1112 /* skip inactive filters */
1113 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1114 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1115 psf->sf_count[MCAST_EXCLUDE])
1116 continue;
1117 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1118 scount++;
1119 break;
1120 }
1121 }
1122 }
1123 pmc->mca_flags &= ~MAF_GSQUERY;
1124 if (scount == nsrcs) /* all sources excluded */
1125 return 0;
1126 return 1;
1127}
1128
1129static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1130 struct in6_addr *srcs)
1131{
1132 struct ip6_sf_list *psf;
1133 int i, scount;
1134
1135 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1136 return mld_xmarksources(pmc, nsrcs, srcs);
1137
1138 /* mark INCLUDE-mode sources */
1139
1140 scount = 0;
1141 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1142 if (scount == nsrcs)
1143 break;
1144 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1145 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1146 psf->sf_gsresp = 1;
1147 scount++;
1148 break;
1149 }
5ab4a6c8
DS		 1150 }
1151 }
1152 if (!scount) {
1153 pmc->mca_flags &= ~MAF_GSQUERY;
1154 return 0;
1da177e4 1155 }
5ab4a6c8
DS		 1156 pmc->mca_flags |= MAF_GSQUERY;
1157 return 1;
1da177e4
LT		 1158}
1159
1160int igmp6_event_query(struct sk_buff *skb)
1161{
97300b5f 1162 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1163 struct ifmcaddr6 *ma;
1164 struct in6_addr *group;
1165 unsigned long max_delay;
1166 struct inet6_dev *idev;
1167 struct icmp6hdr *hdr;
1168 int group_type;
1169 int mark = 0;
1170 int len;
1171
1172 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1173 return -EINVAL;
1174
1175 /* compute payload length excluding extension headers */
0660e03f 1176 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1177 len -= skb_network_header_len(skb);
1da177e4
LT		 1178
1179 /* Drop queries with not link local source */
0660e03f 1180 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1181 return -EINVAL;
1182
1183 idev = in6_dev_get(skb->dev);
1184
1185 if (idev == NULL)
1186 return 0;
1187
cc70ab26 1188 hdr = icmp6_hdr(skb);
1da177e4
LT		 1189 group = (struct in6_addr *) (hdr + 1);
1190 group_type = ipv6_addr_type(group);
1191
1192 if (group_type != IPV6_ADDR_ANY &&
1193 !(group_type&IPV6_ADDR_MULTICAST)) {
1194 in6_dev_put(idev);
1195 return -EINVAL;
1196 }
1197
1198 if (len == 24) {
1199 int switchback;
1200 /* MLDv1 router present */
1201
1202 /* Translate milliseconds to jiffies */
1203 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1204
1205 switchback = (idev->mc_qrv + 1) * max_delay;
1206 idev->mc_v1_seen = jiffies + switchback;
1207
1208 /* cancel the interface change timer */
1209 idev->mc_ifc_count = 0;
1210 if (del_timer(&idev->mc_ifc_timer))
1211 __in6_dev_put(idev);
1212 /* clear deleted report items */
1213 mld_clear_delrec(idev);
1214 } else if (len >= 28) {
1ab1457c 1215 int srcs_offset = sizeof(struct mld2_query) -
97300b5f
YZ		 1216 sizeof(struct icmp6hdr);
1217 if (!pskb_may_pull(skb, srcs_offset)) {
1218 in6_dev_put(idev);
1219 return -EINVAL;
1220 }
9c70220b 1221 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1da177e4
LT		 1222 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1223 if (!max_delay)
1224 max_delay = 1;
1225 idev->mc_maxdelay = max_delay;
1226 if (mlh2->qrv)
1227 idev->mc_qrv = mlh2->qrv;
1228 if (group_type == IPV6_ADDR_ANY) { /* general query */
1229 if (mlh2->nsrcs) {
1230 in6_dev_put(idev);
1231 return -EINVAL; /* no sources allowed */
1232 }
1233 mld_gq_start_timer(idev);
1234 in6_dev_put(idev);
1235 return 0;
1236 }
1237 /* mark sources to include, if group & source-specific */
97300b5f 1238 if (mlh2->nsrcs != 0) {
1ab1457c 1239 if (!pskb_may_pull(skb, srcs_offset +
5ab4a6c8 1240 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1241 in6_dev_put(idev);
1242 return -EINVAL;
1243 }
9c70220b 1244 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1245 mark = 1;
1246 }
1da177e4
LT		 1247 } else {
1248 in6_dev_put(idev);
1249 return -EINVAL;
1250 }
1251
1252 read_lock_bh(&idev->lock);
1253 if (group_type == IPV6_ADDR_ANY) {
1254 for (ma = idev->mc_list; ma; ma=ma->next) {
1255 spin_lock_bh(&ma->mca_lock);
1256 igmp6_group_queried(ma, max_delay);
1257 spin_unlock_bh(&ma->mca_lock);
1258 }
1259 } else {
1260 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1261 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1262 continue;
1263 spin_lock_bh(&ma->mca_lock);
1264 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1265 /* gsquery <- gsquery && mark */
1266 if (!mark)
1267 ma->mca_flags &= ~MAF_GSQUERY;
1268 } else {
1269 /* gsquery <- mark */
1270 if (mark)
1271 ma->mca_flags |= MAF_GSQUERY;
1272 else
1273 ma->mca_flags &= ~MAF_GSQUERY;
1274 }
5ab4a6c8 1275 if (!(ma->mca_flags & MAF_GSQUERY) ||
7add2a43 1276 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
5ab4a6c8 1277 igmp6_group_queried(ma, max_delay);
1da177e4 1278 spin_unlock_bh(&ma->mca_lock);
7add2a43 1279 break;
1da177e4
LT		 1280 }
1281 }
1282 read_unlock_bh(&idev->lock);
1283 in6_dev_put(idev);
1284
1285 return 0;
1286}
1287
1288
1289int igmp6_event_report(struct sk_buff *skb)
1290{
1291 struct ifmcaddr6 *ma;
1292 struct in6_addr *addrp;
1293 struct inet6_dev *idev;
1294 struct icmp6hdr *hdr;
1295 int addr_type;
1296
1297 /* Our own report looped back. Ignore it. */
1298 if (skb->pkt_type == PACKET_LOOPBACK)
1299 return 0;
1300
24c69275
DS		 1301 /* send our report if the MC router may not have heard this report */
1302 if (skb->pkt_type != PACKET_MULTICAST &&
1303 skb->pkt_type != PACKET_BROADCAST)
1304 return 0;
1305
1da177e4
LT		 1306 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1307 return -EINVAL;
1308
cc70ab26 1309 hdr = icmp6_hdr(skb);
1da177e4
LT		 1310
1311 /* Drop reports with not link local source */
0660e03f 1312 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1313 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1314 !(addr_type&IPV6_ADDR_LINKLOCAL))
1315 return -EINVAL;
1316
1317 addrp = (struct in6_addr *) (hdr + 1);
1318
1319 idev = in6_dev_get(skb->dev);
1320 if (idev == NULL)
1321 return -ENODEV;
1322
1323 /*
1324 * Cancel the timer for this group
1325 */
1326
1327 read_lock_bh(&idev->lock);
1328 for (ma = idev->mc_list; ma; ma=ma->next) {
1329 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1330 spin_lock(&ma->mca_lock);
1331 if (del_timer(&ma->mca_timer))
1332 atomic_dec(&ma->mca_refcnt);
1333 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1334 spin_unlock(&ma->mca_lock);
1335 break;
1336 }
1337 }
1338 read_unlock_bh(&idev->lock);
1339 in6_dev_put(idev);
1340 return 0;
1341}
1342
1343static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1344 int gdeleted, int sdeleted)
1345{
1346 switch (type) {
1347 case MLD2_MODE_IS_INCLUDE:
1348 case MLD2_MODE_IS_EXCLUDE:
1349 if (gdeleted || sdeleted)
1350 return 0;
5ab4a6c8
DS		 1351 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1352 if (pmc->mca_sfmode == MCAST_INCLUDE)
1353 return 1;
1354 /* don't include if this source is excluded
1355 * in all filters
1356 */
1357 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1358 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1359 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1360 psf->sf_count[MCAST_EXCLUDE];
1361 }
1362 return 0;
1da177e4
LT		 1363 case MLD2_CHANGE_TO_INCLUDE:
1364 if (gdeleted || sdeleted)
1365 return 0;
1366 return psf->sf_count[MCAST_INCLUDE] != 0;
1367 case MLD2_CHANGE_TO_EXCLUDE:
1368 if (gdeleted || sdeleted)
1369 return 0;
1370 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1371 psf->sf_count[MCAST_INCLUDE])
1372 return 0;
1373 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1374 psf->sf_count[MCAST_EXCLUDE];
1375 case MLD2_ALLOW_NEW_SOURCES:
1376 if (gdeleted || !psf->sf_crcount)
1377 return 0;
1378 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1379 case MLD2_BLOCK_OLD_SOURCES:
1380 if (pmc->mca_sfmode == MCAST_INCLUDE)
1381 return gdeleted || (psf->sf_crcount && sdeleted);
1382 return psf->sf_crcount && !gdeleted && !sdeleted;
1383 }
1384 return 0;
1385}
1386
1387static int
1388mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1389{
1390 struct ip6_sf_list *psf;
1391 int scount = 0;
1392
1393 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1394 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1395 continue;
1396 scount++;
1397 }
1398 return scount;
1399}
1400
1401static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1402{
c346dca1 1403 struct net *net = dev_net(dev);
b8ad0cbc 1404 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1405 struct sk_buff *skb;
1406 struct mld2_report *pmr;
1407 struct in6_addr addr_buf;
1408 int err;
1409 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1410 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1411 IPV6_TLV_PADN, 0 };
1412
1413 /* we assume size > sizeof(ra) here */
1414 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1415
cfcabdcc 1416 if (!skb)
1da177e4
LT		 1417 return NULL;
1418
1419 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1420
95c385b4 1421 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1422 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1423 * use unspecified address as the source address
1da177e4
LT		 1424 * when a valid link-local address is not available.
1425 */
1426 memset(&addr_buf, 0, sizeof(addr_buf));
1427 }
1428
1429 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1430
1431 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1432
27a884dc 1433 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1434 skb_put(skb, sizeof(*pmr));
1435 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1436 pmr->type = ICMPV6_MLD2_REPORT;
1437 pmr->resv1 = 0;
1438 pmr->csum = 0;
1439 pmr->resv2 = 0;
1440 pmr->ngrec = 0;
1441 return skb;
1442}
1443
1444static void mld_sendpack(struct sk_buff *skb)
1445{
0660e03f 1446 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1447 struct mld2_report *pmr =
1448 (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1449 int payload_len, mldlen;
1450 struct inet6_dev *idev = in6_dev_get(skb->dev);
c346dca1 1451 struct net *net = dev_net(skb->dev);
1da177e4 1452 int err;
41927178 1453 struct flowi fl;
1da177e4 1454
a11d206d 1455 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
27a884dc
ACM		 1456 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1457 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1458 pip6->payload_len = htons(payload_len);
1459
1460 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
9c70220b
ACM		 1461 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1462 mldlen, 0));
41927178
YH		 1463
1464 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1465
1466 if (!skb->dst) {
1467 err = -ENOMEM;
1468 goto err_out;
1469 }
1470
b8ad0cbc 1471 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
41927178
YH		 1472 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1473 skb->dev->ifindex);
1474
1475 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1476 if (err)
1477 goto err_out;
1478
6e23ae2a 1479 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1480 dst_output);
1481out:
1da177e4 1482 if (!err) {
14878f75
DS		 1483 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1484 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1485 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1486 } else
14878f75 1487 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1488
1489 if (likely(idev != NULL))
1490 in6_dev_put(idev);
41927178
YH		 1491 return;
1492
1493err_out:
1494 kfree_skb(skb);
1495 goto out;
1da177e4
LT		 1496}
1497
1498static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1499{
fab10fe3 1500 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1501}
1502
1503static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1504 int type, struct mld2_grec **ppgr)
1505{
1506 struct net_device *dev = pmc->idev->dev;
1507 struct mld2_report *pmr;
1508 struct mld2_grec *pgr;
1509
1510 if (!skb)
1511 skb = mld_newpack(dev, dev->mtu);
1512 if (!skb)
1513 return NULL;
1514 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1515 pgr->grec_type = type;
1516 pgr->grec_auxwords = 0;
1517 pgr->grec_nsrcs = 0;
1518 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1519 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1520 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1521 *ppgr = pgr;
1522 return skb;
1523}
1524
1525#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1526 skb_tailroom(skb)) : 0)
1527
1528static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1529 int type, int gdeleted, int sdeleted)
1530{
1531 struct net_device *dev = pmc->idev->dev;
1532 struct mld2_report *pmr;
1533 struct mld2_grec *pgr = NULL;
1534 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1535 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1536
1537 if (pmc->mca_flags & MAF_NOREPORT)
1538 return skb;
1539
1540 isquery = type == MLD2_MODE_IS_INCLUDE ||
1541 type == MLD2_MODE_IS_EXCLUDE;
1542 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1543 type == MLD2_CHANGE_TO_EXCLUDE;
1544
5ab4a6c8
DS		 1545 stotal = scount = 0;
1546
1da177e4
LT		 1547 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1548
5ab4a6c8
DS		 1549 if (!*psf_list)
1550 goto empty_source;
1551
9c70220b 1552 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1553
1554 /* EX and TO_EX get a fresh packet, if needed */
1555 if (truncate) {
1556 if (pmr && pmr->ngrec &&
1557 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1558 if (skb)
1559 mld_sendpack(skb);
1560 skb = mld_newpack(dev, dev->mtu);
1561 }
1562 }
1563 first = 1;
1da177e4
LT		 1564 psf_prev = NULL;
1565 for (psf=*psf_list; psf; psf=psf_next) {
1566 struct in6_addr *psrc;
1567
1568 psf_next = psf->sf_next;
1569
1570 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1571 psf_prev = psf;
1572 continue;
1573 }
1574
1575 /* clear marks on query responses */
1576 if (isquery)
1577 psf->sf_gsresp = 0;
1578
1579 if (AVAILABLE(skb) < sizeof(*psrc) +
1580 first*sizeof(struct mld2_grec)) {
1581 if (truncate && !first)
1582 break; /* truncate these */
1583 if (pgr)
1584 pgr->grec_nsrcs = htons(scount);
1585 if (skb)
1586 mld_sendpack(skb);
1587 skb = mld_newpack(dev, dev->mtu);
1588 first = 1;
1589 scount = 0;
1590 }
1591 if (first) {
1592 skb = add_grhead(skb, pmc, type, &pgr);
1593 first = 0;
1594 }
cc63f70b
AD		 1595 if (!skb)
1596 return NULL;
1da177e4
LT		 1597 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1598 *psrc = psf->sf_addr;
5ab4a6c8 1599 scount++; stotal++;
1da177e4
LT		 1600 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1601 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1602 psf->sf_crcount--;
1603 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1604 if (psf_prev)
1605 psf_prev->sf_next = psf->sf_next;
1606 else
1607 *psf_list = psf->sf_next;
1608 kfree(psf);
1609 continue;
1610 }
1611 }
1612 psf_prev = psf;
1613 }
5ab4a6c8
DS		 1614
1615empty_source:
1616 if (!stotal) {
1617 if (type == MLD2_ALLOW_NEW_SOURCES ||
1618 type == MLD2_BLOCK_OLD_SOURCES)
1619 return skb;
1620 if (pmc->mca_crcount || isquery) {
1621 /* make sure we have room for group header */
1622 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1623 mld_sendpack(skb);
1624 skb = NULL; /* add_grhead will get a new one */
1625 }
1626 skb = add_grhead(skb, pmc, type, &pgr);
1627 }
1628 }
1da177e4
LT		 1629 if (pgr)
1630 pgr->grec_nsrcs = htons(scount);
1631
1632 if (isquery)
1633 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1634 return skb;
1635}
1636
1637static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1638{
1639 struct sk_buff *skb = NULL;
1640 int type;
1641
1642 if (!pmc) {
1643 read_lock_bh(&idev->lock);
1644 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1645 if (pmc->mca_flags & MAF_NOREPORT)
1646 continue;
1647 spin_lock_bh(&pmc->mca_lock);
1648 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1649 type = MLD2_MODE_IS_EXCLUDE;
1650 else
1651 type = MLD2_MODE_IS_INCLUDE;
1652 skb = add_grec(skb, pmc, type, 0, 0);
1653 spin_unlock_bh(&pmc->mca_lock);
1654 }
1655 read_unlock_bh(&idev->lock);
1656 } else {
1657 spin_lock_bh(&pmc->mca_lock);
1658 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1659 type = MLD2_MODE_IS_EXCLUDE;
1660 else
1661 type = MLD2_MODE_IS_INCLUDE;
1662 skb = add_grec(skb, pmc, type, 0, 0);
1663 spin_unlock_bh(&pmc->mca_lock);
1664 }
1665 if (skb)
1666 mld_sendpack(skb);
1667}
1668
1669/*
1670 * remove zero-count source records from a source filter list
1671 */
1672static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1673{
1674 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1675
1676 psf_prev = NULL;
1677 for (psf=*ppsf; psf; psf = psf_next) {
1678 psf_next = psf->sf_next;
1679 if (psf->sf_crcount == 0) {
1680 if (psf_prev)
1681 psf_prev->sf_next = psf->sf_next;
1682 else
1683 *ppsf = psf->sf_next;
1684 kfree(psf);
1685 } else
1686 psf_prev = psf;
1687 }
1688}
1689
1690static void mld_send_cr(struct inet6_dev *idev)
1691{
1692 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1693 struct sk_buff *skb = NULL;
1694 int type, dtype;
1695
1696 read_lock_bh(&idev->lock);
1697 write_lock_bh(&idev->mc_lock);
1698
1699 /* deleted MCA's */
1700 pmc_prev = NULL;
1701 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1702 pmc_next = pmc->next;
1703 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1704 type = MLD2_BLOCK_OLD_SOURCES;
1705 dtype = MLD2_BLOCK_OLD_SOURCES;
1706 skb = add_grec(skb, pmc, type, 1, 0);
1707 skb = add_grec(skb, pmc, dtype, 1, 1);
1708 }
1709 if (pmc->mca_crcount) {
1da177e4
LT		 1710 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1711 type = MLD2_CHANGE_TO_INCLUDE;
1712 skb = add_grec(skb, pmc, type, 1, 0);
1713 }
5ab4a6c8 1714 pmc->mca_crcount--;
1da177e4
LT		 1715 if (pmc->mca_crcount == 0) {
1716 mld_clear_zeros(&pmc->mca_tomb);
1717 mld_clear_zeros(&pmc->mca_sources);
1718 }
1719 }
1720 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1721 !pmc->mca_sources) {
1722 if (pmc_prev)
1723 pmc_prev->next = pmc_next;
1724 else
1725 idev->mc_tomb = pmc_next;
1726 in6_dev_put(pmc->idev);
1727 kfree(pmc);
1728 } else
1729 pmc_prev = pmc;
1730 }
1731 write_unlock_bh(&idev->mc_lock);
1732
1733 /* change recs */
1734 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1735 spin_lock_bh(&pmc->mca_lock);
1736 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1737 type = MLD2_BLOCK_OLD_SOURCES;
1738 dtype = MLD2_ALLOW_NEW_SOURCES;
1739 } else {
1740 type = MLD2_ALLOW_NEW_SOURCES;
1741 dtype = MLD2_BLOCK_OLD_SOURCES;
1742 }
1743 skb = add_grec(skb, pmc, type, 0, 0);
1744 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1745
1746 /* filter mode changes */
1747 if (pmc->mca_crcount) {
1da177e4
LT		 1748 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1749 type = MLD2_CHANGE_TO_EXCLUDE;
1750 else
1751 type = MLD2_CHANGE_TO_INCLUDE;
1752 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1753 pmc->mca_crcount--;
1da177e4
LT		 1754 }
1755 spin_unlock_bh(&pmc->mca_lock);
1756 }
1757 read_unlock_bh(&idev->lock);
1758 if (!skb)
1759 return;
1760 (void) mld_sendpack(skb);
1761}
1762
1763static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1764{
c346dca1 1765 struct net *net = dev_net(dev);
b8ad0cbc 1766 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1767 struct inet6_dev *idev;
1ab1457c
YH		 1768 struct sk_buff *skb;
1769 struct icmp6hdr *hdr;
1da177e4
LT		 1770 struct in6_addr *snd_addr;
1771 struct in6_addr *addrp;
1772 struct in6_addr addr_buf;
1773 struct in6_addr all_routers;
1774 int err, len, payload_len, full_len;
1775 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1776 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1777 IPV6_TLV_PADN, 0 };
41927178 1778 struct flowi fl;
1da177e4 1779
a11d206d
YH		 1780 rcu_read_lock();
1781 IP6_INC_STATS(__in6_dev_get(dev),
1782 IPSTATS_MIB_OUTREQUESTS);
1783 rcu_read_unlock();
1da177e4
LT		 1784 snd_addr = addr;
1785 if (type == ICMPV6_MGM_REDUCTION) {
1786 snd_addr = &all_routers;
1787 ipv6_addr_all_routers(&all_routers);
1788 }
1789
1790 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1791 payload_len = len + sizeof(ra);
1792 full_len = sizeof(struct ipv6hdr) + payload_len;
1793
1794 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1795
1796 if (skb == NULL) {
a11d206d
YH		 1797 rcu_read_lock();
1798 IP6_INC_STATS(__in6_dev_get(dev),
1799 IPSTATS_MIB_OUTDISCARDS);
1800 rcu_read_unlock();
1da177e4
LT		 1801 return;
1802 }
1803
1804 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1805
95c385b4 1806 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1807 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1808 * use unspecified address as the source address
1da177e4
LT		 1809 * when a valid link-local address is not available.
1810 */
1811 memset(&addr_buf, 0, sizeof(addr_buf));
1812 }
1813
1814 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1815
1816 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1817
1818 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1819 memset(hdr, 0, sizeof(struct icmp6hdr));
1820 hdr->icmp6_type = type;
1821
1822 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1823 ipv6_addr_copy(addrp, addr);
1824
1825 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1826 IPPROTO_ICMPV6,
1827 csum_partial((__u8 *) hdr, len, 0));
1828
1829 idev = in6_dev_get(skb->dev);
1830
41927178
YH		 1831 skb->dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1832 if (!skb->dst) {
1833 err = -ENOMEM;
1834 goto err_out;
1835 }
1836
b8ad0cbc 1837 icmpv6_flow_init(sk, &fl, type,
41927178
YH		 1838 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1839 skb->dev->ifindex);
1840
1841 err = xfrm_lookup(&skb->dst, &fl, NULL, 0);
1842 if (err)
1843 goto err_out;
1844
6e23ae2a 1845 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1846 dst_output);
1847out:
1da177e4 1848 if (!err) {
14878f75 1849 ICMP6MSGOUT_INC_STATS(idev, type);
1da177e4 1850 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
a11d206d 1851 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1da177e4 1852 } else
a11d206d 1853 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1854
1855 if (likely(idev != NULL))
1856 in6_dev_put(idev);
1857 return;
41927178
YH		 1858
1859err_out:
1860 kfree_skb(skb);
1861 goto out;
1da177e4
LT		 1862}
1863
1864static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1865 struct in6_addr *psfsrc)
1866{
1867 struct ip6_sf_list *psf, *psf_prev;
1868 int rv = 0;
1869
1870 psf_prev = NULL;
1871 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1872 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1873 break;
1874 psf_prev = psf;
1875 }
1876 if (!psf || psf->sf_count[sfmode] == 0) {
1877 /* source filter not found, or count wrong => bug */
1878 return -ESRCH;
1879 }
1880 psf->sf_count[sfmode]--;
1881 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1882 struct inet6_dev *idev = pmc->idev;
1883
1884 /* no more filters for this source */
1885 if (psf_prev)
1886 psf_prev->sf_next = psf->sf_next;
1887 else
1888 pmc->mca_sources = psf->sf_next;
1889 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1890 !MLD_V1_SEEN(idev)) {
1891 psf->sf_crcount = idev->mc_qrv;
1892 psf->sf_next = pmc->mca_tomb;
1893 pmc->mca_tomb = psf;
1894 rv = 1;
1895 } else
1896 kfree(psf);
1897 }
1898 return rv;
1899}
1900
1901static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1902 int sfmode, int sfcount, struct in6_addr *psfsrc,
1903 int delta)
1904{
1905 struct ifmcaddr6 *pmc;
1906 int changerec = 0;
1907 int i, err;
1908
1909 if (!idev)
1910 return -ENODEV;
1911 read_lock_bh(&idev->lock);
1912 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1913 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1914 break;
1915 }
1916 if (!pmc) {
1917 /* MCA not found?? bug */
1918 read_unlock_bh(&idev->lock);
1919 return -ESRCH;
1920 }
1921 spin_lock_bh(&pmc->mca_lock);
1922 sf_markstate(pmc);
1923 if (!delta) {
1924 if (!pmc->mca_sfcount[sfmode]) {
1925 spin_unlock_bh(&pmc->mca_lock);
1926 read_unlock_bh(&idev->lock);
1927 return -EINVAL;
1928 }
1929 pmc->mca_sfcount[sfmode]--;
1930 }
1931 err = 0;
1932 for (i=0; i<sfcount; i++) {
1933 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1934
1935 changerec |= rv > 0;
1936 if (!err && rv < 0)
1937 err = rv;
1938 }
1939 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1940 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1941 pmc->mca_sfcount[MCAST_INCLUDE]) {
1942 struct ip6_sf_list *psf;
1943
1944 /* filter mode change */
1945 pmc->mca_sfmode = MCAST_INCLUDE;
1946 pmc->mca_crcount = idev->mc_qrv;
1947 idev->mc_ifc_count = pmc->mca_crcount;
1948 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1949 psf->sf_crcount = 0;
1950 mld_ifc_event(pmc->idev);
1951 } else if (sf_setstate(pmc) || changerec)
1952 mld_ifc_event(pmc->idev);
1953 spin_unlock_bh(&pmc->mca_lock);
1954 read_unlock_bh(&idev->lock);
1955 return err;
1956}
1957
1958/*
1959 * Add multicast single-source filter to the interface list
1960 */
1961static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1962 struct in6_addr *psfsrc, int delta)
1963{
1964 struct ip6_sf_list *psf, *psf_prev;
1965
1966 psf_prev = NULL;
1967 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1968 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1969 break;
1970 psf_prev = psf;
1971 }
1972 if (!psf) {
0c600eda 1973 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1974 if (!psf)
1975 return -ENOBUFS;
0c600eda 1976
1da177e4
LT		 1977 psf->sf_addr = *psfsrc;
1978 if (psf_prev) {
1979 psf_prev->sf_next = psf;
1980 } else
1981 pmc->mca_sources = psf;
1982 }
1983 psf->sf_count[sfmode]++;
1984 return 0;
1985}
1986
1987static void sf_markstate(struct ifmcaddr6 *pmc)
1988{
1989 struct ip6_sf_list *psf;
1990 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1991
1992 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1993 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1994 psf->sf_oldin = mca_xcount ==
1995 psf->sf_count[MCAST_EXCLUDE] &&
1996 !psf->sf_count[MCAST_INCLUDE];
1997 } else
1998 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1999}
2000
2001static int sf_setstate(struct ifmcaddr6 *pmc)
2002{
7add2a43 2003 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2004 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2005 int qrv = pmc->idev->mc_qrv;
2006 int new_in, rv;
2007
2008 rv = 0;
2009 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2010 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2011 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2012 !psf->sf_count[MCAST_INCLUDE];
2013 } else
2014 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2015 if (new_in) {
2016 if (!psf->sf_oldin) {
e80e28b6 2017 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 2018
2019 for (dpsf=pmc->mca_tomb; dpsf;
2020 dpsf=dpsf->sf_next) {
2021 if (ipv6_addr_equal(&dpsf->sf_addr,
2022 &psf->sf_addr))
2023 break;
2024 prev = dpsf;
2025 }
2026 if (dpsf) {
2027 if (prev)
2028 prev->sf_next = dpsf->sf_next;
2029 else
2030 pmc->mca_tomb = dpsf->sf_next;
2031 kfree(dpsf);
2032 }
2033 psf->sf_crcount = qrv;
2034 rv++;
2035 }
2036 } else if (psf->sf_oldin) {
2037 psf->sf_crcount = 0;
2038 /*
2039 * add or update "delete" records if an active filter
2040 * is now inactive
2041 */
2042 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2043 if (ipv6_addr_equal(&dpsf->sf_addr,
2044 &psf->sf_addr))
2045 break;
2046 if (!dpsf) {
2047 dpsf = (struct ip6_sf_list *)
2048 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2049 if (!dpsf)
2050 continue;
2051 *dpsf = *psf;
2052 /* pmc->mca_lock held by callers */
2053 dpsf->sf_next = pmc->mca_tomb;
2054 pmc->mca_tomb = dpsf;
2055 }
2056 dpsf->sf_crcount = qrv;
1da177e4
LT		 2057 rv++;
2058 }
2059 }
2060 return rv;
2061}
2062
2063/*
2064 * Add multicast source filter list to the interface list
2065 */
2066static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2067 int sfmode, int sfcount, struct in6_addr *psfsrc,
2068 int delta)
2069{
2070 struct ifmcaddr6 *pmc;
2071 int isexclude;
2072 int i, err;
2073
2074 if (!idev)
2075 return -ENODEV;
2076 read_lock_bh(&idev->lock);
2077 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2078 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2079 break;
2080 }
2081 if (!pmc) {
2082 /* MCA not found?? bug */
2083 read_unlock_bh(&idev->lock);
2084 return -ESRCH;
2085 }
2086 spin_lock_bh(&pmc->mca_lock);
2087
2088 sf_markstate(pmc);
2089 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2090 if (!delta)
2091 pmc->mca_sfcount[sfmode]++;
2092 err = 0;
2093 for (i=0; i<sfcount; i++) {
2094 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2095 if (err)
2096 break;
2097 }
2098 if (err) {
2099 int j;
2100
2101 if (!delta)
2102 pmc->mca_sfcount[sfmode]--;
2103 for (j=0; j<i; j++)
2104 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2105 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2106 struct inet6_dev *idev = pmc->idev;
2107 struct ip6_sf_list *psf;
2108
2109 /* filter mode change */
2110 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2111 pmc->mca_sfmode = MCAST_EXCLUDE;
2112 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2113 pmc->mca_sfmode = MCAST_INCLUDE;
2114 /* else no filters; keep old mode for reports */
2115
2116 pmc->mca_crcount = idev->mc_qrv;
2117 idev->mc_ifc_count = pmc->mca_crcount;
2118 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2119 psf->sf_crcount = 0;
2120 mld_ifc_event(idev);
2121 } else if (sf_setstate(pmc))
2122 mld_ifc_event(idev);
2123 spin_unlock_bh(&pmc->mca_lock);
2124 read_unlock_bh(&idev->lock);
2125 return err;
2126}
2127
2128static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2129{
2130 struct ip6_sf_list *psf, *nextpsf;
2131
2132 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2133 nextpsf = psf->sf_next;
2134 kfree(psf);
2135 }
2136 pmc->mca_tomb = NULL;
2137 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2138 nextpsf = psf->sf_next;
2139 kfree(psf);
2140 }
2141 pmc->mca_sources = NULL;
2142 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2143 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2144 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2145}
2146
2147
2148static void igmp6_join_group(struct ifmcaddr6 *ma)
2149{
2150 unsigned long delay;
2151
2152 if (ma->mca_flags & MAF_NOREPORT)
2153 return;
2154
2155 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2156
2157 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2158
2159 spin_lock_bh(&ma->mca_lock);
2160 if (del_timer(&ma->mca_timer)) {
2161 atomic_dec(&ma->mca_refcnt);
2162 delay = ma->mca_timer.expires - jiffies;
2163 }
2164
2165 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2166 atomic_inc(&ma->mca_refcnt);
2167 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2168 spin_unlock_bh(&ma->mca_lock);
2169}
2170
2171static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2172 struct inet6_dev *idev)
2173{
2174 int err;
2175
5ab4a6c8
DS		 2176 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2177 * so no other readers or writers of iml or its sflist
2178 */
cfcabdcc 2179 if (!iml->sflist) {
1da177e4
LT		 2180 /* any-source empty exclude case */
2181 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2182 }
2183 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2184 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2185 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2186 iml->sflist = NULL;
2187 return err;
2188}
2189
2190static void igmp6_leave_group(struct ifmcaddr6 *ma)
2191{
2192 if (MLD_V1_SEEN(ma->idev)) {
2193 if (ma->mca_flags & MAF_LAST_REPORTER)
2194 igmp6_send(&ma->mca_addr, ma->idev->dev,
2195 ICMPV6_MGM_REDUCTION);
2196 } else {
2197 mld_add_delrec(ma->idev, ma);
2198 mld_ifc_event(ma->idev);
2199 }
2200}
2201
2202static void mld_gq_timer_expire(unsigned long data)
2203{
2204 struct inet6_dev *idev = (struct inet6_dev *)data;
2205
2206 idev->mc_gq_running = 0;
2207 mld_send_report(idev, NULL);
2208 __in6_dev_put(idev);
2209}
2210
2211static void mld_ifc_timer_expire(unsigned long data)
2212{
2213 struct inet6_dev *idev = (struct inet6_dev *)data;
2214
2215 mld_send_cr(idev);
2216 if (idev->mc_ifc_count) {
2217 idev->mc_ifc_count--;
2218 if (idev->mc_ifc_count)
2219 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2220 }
2221 __in6_dev_put(idev);
2222}
2223
2224static void mld_ifc_event(struct inet6_dev *idev)
2225{
2226 if (MLD_V1_SEEN(idev))
2227 return;
2228 idev->mc_ifc_count = idev->mc_qrv;
2229 mld_ifc_start_timer(idev, 1);
2230}
2231
2232
2233static void igmp6_timer_handler(unsigned long data)
2234{
2235 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2236
2237 if (MLD_V1_SEEN(ma->idev))
2238 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2239 else
2240 mld_send_report(ma->idev, ma);
2241
2242 spin_lock(&ma->mca_lock);
2243 ma->mca_flags |= MAF_LAST_REPORTER;
2244 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2245 spin_unlock(&ma->mca_lock);
2246 ma_put(ma);
2247}
2248
2249/* Device going down */
2250
2251void ipv6_mc_down(struct inet6_dev *idev)
2252{
2253 struct ifmcaddr6 *i;
2254
2255 /* Withdraw multicast list */
2256
2257 read_lock_bh(&idev->lock);
2258 idev->mc_ifc_count = 0;
2259 if (del_timer(&idev->mc_ifc_timer))
2260 __in6_dev_put(idev);
2261 idev->mc_gq_running = 0;
2262 if (del_timer(&idev->mc_gq_timer))
2263 __in6_dev_put(idev);
2264
2265 for (i = idev->mc_list; i; i=i->next)
2266 igmp6_group_dropped(i);
2267 read_unlock_bh(&idev->lock);
2268
2269 mld_clear_delrec(idev);
2270}
2271
2272
2273/* Device going up */
2274
2275void ipv6_mc_up(struct inet6_dev *idev)
2276{
2277 struct ifmcaddr6 *i;
2278
2279 /* Install multicast list, except for all-nodes (already installed) */
2280
2281 read_lock_bh(&idev->lock);
2282 for (i = idev->mc_list; i; i=i->next)
2283 igmp6_group_added(i);
2284 read_unlock_bh(&idev->lock);
2285}
2286
2287/* IPv6 device initialization. */
2288
2289void ipv6_mc_init_dev(struct inet6_dev *idev)
2290{
1da177e4
LT		 2291 write_lock_bh(&idev->lock);
2292 rwlock_init(&idev->mc_lock);
2293 idev->mc_gq_running = 0;
b24b8a24
PE		 2294 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2295 (unsigned long)idev);
1da177e4
LT		 2296 idev->mc_tomb = NULL;
2297 idev->mc_ifc_count = 0;
b24b8a24
PE		 2298 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2299 (unsigned long)idev);
1da177e4
LT		 2300 idev->mc_qrv = MLD_QRV_DEFAULT;
2301 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2302 idev->mc_v1_seen = 0;
2303 write_unlock_bh(&idev->lock);
1da177e4
LT		 2304}
2305
2306/*
2307 * Device is about to be destroyed: clean up.
2308 */
2309
2310void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2311{
2312 struct ifmcaddr6 *i;
2313 struct in6_addr maddr;
2314
2315 /* Deactivate timers */
2316 ipv6_mc_down(idev);
2317
2318 /* Delete all-nodes address. */
2319 ipv6_addr_all_nodes(&maddr);
2320
2321 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2322 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2323 * fail.
2324 */
2325 __ipv6_dev_mc_dec(idev, &maddr);
2326
2327 if (idev->cnf.forwarding) {
2328 ipv6_addr_all_routers(&maddr);
2329 __ipv6_dev_mc_dec(idev, &maddr);
2330 }
2331
2332 write_lock_bh(&idev->lock);
2333 while ((i = idev->mc_list) != NULL) {
2334 idev->mc_list = i->next;
2335 write_unlock_bh(&idev->lock);
2336
2337 igmp6_group_dropped(i);
2338 ma_put(i);
2339
2340 write_lock_bh(&idev->lock);
2341 }
2342 write_unlock_bh(&idev->lock);
2343}
2344
2345#ifdef CONFIG_PROC_FS
2346struct igmp6_mc_iter_state {
b8ad0cbc 2347 struct seq_net_private p;
1da177e4
LT		 2348 struct net_device *dev;
2349 struct inet6_dev *idev;
2350};
2351
2352#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2353
2354static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2355{
2356 struct ifmcaddr6 *im = NULL;
2357 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
b8ad0cbc 2358 struct net *net = state->p.net;
1da177e4 2359
7562f876 2360 state->idev = NULL;
b8ad0cbc 2361 for_each_netdev(net, state->dev) {
1da177e4
LT		 2362 struct inet6_dev *idev;
2363 idev = in6_dev_get(state->dev);
2364 if (!idev)
2365 continue;
2366 read_lock_bh(&idev->lock);
2367 im = idev->mc_list;
2368 if (im) {
2369 state->idev = idev;
2370 break;
2371 }
2372 read_unlock_bh(&idev->lock);
2373 in6_dev_put(idev);
2374 }
2375 return im;
2376}
2377
2378static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2379{
2380 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2381
2382 im = im->next;
2383 while (!im) {
2384 if (likely(state->idev != NULL)) {
2385 read_unlock_bh(&state->idev->lock);
2386 in6_dev_put(state->idev);
2387 }
7562f876 2388 state->dev = next_net_device(state->dev);
1da177e4
LT		 2389 if (!state->dev) {
2390 state->idev = NULL;
2391 break;
2392 }
2393 state->idev = in6_dev_get(state->dev);
2394 if (!state->idev)
2395 continue;
2396 read_lock_bh(&state->idev->lock);
2397 im = state->idev->mc_list;
2398 }
2399 return im;
2400}
2401
2402static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2403{
2404 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2405 if (im)
2406 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2407 --pos;
2408 return pos ? NULL : im;
2409}
2410
2411static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2412 __acquires(dev_base_lock)
1da177e4
LT		 2413{
2414 read_lock(&dev_base_lock);
2415 return igmp6_mc_get_idx(seq, *pos);
2416}
2417
2418static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2419{
2420 struct ifmcaddr6 *im;
2421 im = igmp6_mc_get_next(seq, v);
2422 ++*pos;
2423 return im;
2424}
2425
2426static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
9a429c49 2427 __releases(dev_base_lock)
1da177e4
LT		 2428{
2429 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2430 if (likely(state->idev != NULL)) {
2431 read_unlock_bh(&state->idev->lock);
2432 in6_dev_put(state->idev);
2433 state->idev = NULL;
2434 }
2435 state->dev = NULL;
2436 read_unlock(&dev_base_lock);
2437}
2438
2439static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2440{
2441 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2442 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2443
2444 seq_printf(seq,
1ab1457c 2445 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
1da177e4
LT		 2446 state->dev->ifindex, state->dev->name,
2447 NIP6(im->mca_addr),
2448 im->mca_users, im->mca_flags,
2449 (im->mca_flags&MAF_TIMER_RUNNING) ?
2450 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2451 return 0;
2452}
2453
56b3d975 2454static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2455 .start = igmp6_mc_seq_start,
2456 .next = igmp6_mc_seq_next,
2457 .stop = igmp6_mc_seq_stop,
2458 .show = igmp6_mc_seq_show,
2459};
2460
2461static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2462{
b8ad0cbc
DL		 2463 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2464 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2465}
2466
9a32144e 2467static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2468 .owner = THIS_MODULE,
2469 .open = igmp6_mc_seq_open,
2470 .read = seq_read,
2471 .llseek = seq_lseek,
b8ad0cbc 2472 .release = seq_release_net,
1da177e4
LT		 2473};
2474
2475struct igmp6_mcf_iter_state {
b8ad0cbc 2476 struct seq_net_private p;
1da177e4
LT		 2477 struct net_device *dev;
2478 struct inet6_dev *idev;
2479 struct ifmcaddr6 *im;
2480};
2481
2482#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2483
2484static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2485{
2486 struct ip6_sf_list *psf = NULL;
2487 struct ifmcaddr6 *im = NULL;
2488 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
b8ad0cbc 2489 struct net *net = state->p.net;
1da177e4 2490
7562f876
PE		 2491 state->idev = NULL;
2492 state->im = NULL;
b8ad0cbc 2493 for_each_netdev(net, state->dev) {
1da177e4
LT		 2494 struct inet6_dev *idev;
2495 idev = in6_dev_get(state->dev);
2496 if (unlikely(idev == NULL))
2497 continue;
2498 read_lock_bh(&idev->lock);
2499 im = idev->mc_list;
2500 if (likely(im != NULL)) {
2501 spin_lock_bh(&im->mca_lock);
2502 psf = im->mca_sources;
2503 if (likely(psf != NULL)) {
2504 state->im = im;
2505 state->idev = idev;
2506 break;
2507 }
2508 spin_unlock_bh(&im->mca_lock);
2509 }
2510 read_unlock_bh(&idev->lock);
2511 in6_dev_put(idev);
2512 }
2513 return psf;
2514}
2515
2516static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2517{
2518 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2519
2520 psf = psf->sf_next;
2521 while (!psf) {
2522 spin_unlock_bh(&state->im->mca_lock);
2523 state->im = state->im->next;
2524 while (!state->im) {
2525 if (likely(state->idev != NULL)) {
2526 read_unlock_bh(&state->idev->lock);
2527 in6_dev_put(state->idev);
2528 }
7562f876 2529 state->dev = next_net_device(state->dev);
1da177e4
LT		 2530 if (!state->dev) {
2531 state->idev = NULL;
2532 goto out;
2533 }
2534 state->idev = in6_dev_get(state->dev);
2535 if (!state->idev)
2536 continue;
2537 read_lock_bh(&state->idev->lock);
2538 state->im = state->idev->mc_list;
2539 }
2540 if (!state->im)
2541 break;
2542 spin_lock_bh(&state->im->mca_lock);
2543 psf = state->im->mca_sources;
2544 }
2545out:
2546 return psf;
2547}
2548
2549static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2550{
2551 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2552 if (psf)
2553 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2554 --pos;
2555 return pos ? NULL : psf;
2556}
2557
2558static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
9a429c49 2559 __acquires(dev_base_lock)
1da177e4
LT		 2560{
2561 read_lock(&dev_base_lock);
2562 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2563}
2564
2565static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2566{
2567 struct ip6_sf_list *psf;
2568 if (v == SEQ_START_TOKEN)
2569 psf = igmp6_mcf_get_first(seq);
2570 else
2571 psf = igmp6_mcf_get_next(seq, v);
2572 ++*pos;
2573 return psf;
2574}
2575
2576static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
9a429c49 2577 __releases(dev_base_lock)
1da177e4
LT		 2578{
2579 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2580 if (likely(state->im != NULL)) {
2581 spin_unlock_bh(&state->im->mca_lock);
2582 state->im = NULL;
2583 }
2584 if (likely(state->idev != NULL)) {
2585 read_unlock_bh(&state->idev->lock);
2586 in6_dev_put(state->idev);
2587 state->idev = NULL;
2588 }
2589 state->dev = NULL;
2590 read_unlock(&dev_base_lock);
2591}
2592
2593static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2594{
2595 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2596 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2597
2598 if (v == SEQ_START_TOKEN) {
1ab1457c 2599 seq_printf(seq,
1da177e4 2600 "%3s %6s "
9343e79a 2601 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2602 "Device", "Multicast Address",
2603 "Source Address", "INC", "EXC");
2604 } else {
2605 seq_printf(seq,
9343e79a 2606 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
1da177e4
LT		 2607 state->dev->ifindex, state->dev->name,
2608 NIP6(state->im->mca_addr),
2609 NIP6(psf->sf_addr),
2610 psf->sf_count[MCAST_INCLUDE],
2611 psf->sf_count[MCAST_EXCLUDE]);
2612 }
2613 return 0;
2614}
2615
56b3d975 2616static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2617 .start = igmp6_mcf_seq_start,
2618 .next = igmp6_mcf_seq_next,
2619 .stop = igmp6_mcf_seq_stop,
2620 .show = igmp6_mcf_seq_show,
2621};
2622
2623static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2624{
b8ad0cbc
DL		 2625 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2626 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2627}
2628
9a32144e 2629static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2630 .owner = THIS_MODULE,
2631 .open = igmp6_mcf_seq_open,
2632 .read = seq_read,
2633 .llseek = seq_lseek,
b8ad0cbc 2634 .release = seq_release_net,
1da177e4 2635};
ea82edf7
DL		 2636
2637static int igmp6_proc_init(struct net *net)
2638{
2639 int err;
2640
2641 err = -ENOMEM;
2642 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2643 goto out;
2644 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2645 &igmp6_mcf_seq_fops))
2646 goto out_proc_net_igmp6;
2647
2648 err = 0;
2649out:
2650 return err;
2651
2652out_proc_net_igmp6:
2653 proc_net_remove(net, "igmp6");
2654 goto out;
2655}
2656
2657static void igmp6_proc_exit(struct net *net)
2658{
2659 proc_net_remove(net, "mcfilter6");
2660 proc_net_remove(net, "igmp6");
2661}
2662#else
2663static int igmp6_proc_init(struct net *net)
2664{
2665 return 0;
2666}
2667static void igmp6_proc_exit(struct net *net)
2668{
2669 ;
2670}
1da177e4
LT		 2671#endif
2672
b8ad0cbc 2673static int igmp6_net_init(struct net *net)
1da177e4
LT		 2674{
2675 struct ipv6_pinfo *np;
b8ad0cbc 2676 struct socket *sock;
1da177e4
LT		 2677 struct sock *sk;
2678 int err;
2679
b8ad0cbc 2680 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &sock);
1da177e4
LT		 2681 if (err < 0) {
2682 printk(KERN_ERR
2683 "Failed to initialize the IGMP6 control socket (err %d).\n",
2684 err);
b8ad0cbc 2685 goto out;
1da177e4
LT		 2686 }
2687
b8ad0cbc
DL		 2688 net->ipv6.igmp_sk = sk = sock->sk;
2689 sk_change_net(sk, net);
1da177e4
LT		 2690 sk->sk_allocation = GFP_ATOMIC;
2691 sk->sk_prot->unhash(sk);
2692
2693 np = inet6_sk(sk);
2694 np->hop_limit = 1;
2695
ea82edf7
DL		 2696 err = igmp6_proc_init(net);
2697 if (err)
b8ad0cbc 2698 goto out_sock_create;
b8ad0cbc
DL		 2699out:
2700 return err;
2701
2702out_sock_create:
2703 sk_release_kernel(net->ipv6.igmp_sk);
2704 goto out;
1da177e4
LT		 2705}
2706
b8ad0cbc 2707static void igmp6_net_exit(struct net *net)
1da177e4 2708{
b8ad0cbc 2709 sk_release_kernel(net->ipv6.igmp_sk);
ea82edf7 2710 igmp6_proc_exit(net);
1da177e4 2711}
b8ad0cbc
DL		 2712
2713static struct pernet_operations igmp6_net_ops = {
2714 .init = igmp6_net_init,
2715 .exit = igmp6_net_exit,
2716};
2717
2718int __init igmp6_init(void)
2719{
2720 return register_pernet_subsys(&igmp6_net_ops);
2721}
2722
2723void igmp6_cleanup(void)
2724{
2725 unregister_pernet_subsys(&igmp6_net_ops);
2726}
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