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[net-next-2.6.git] / net / ipv6 / mcast.c
CommitLineData
1da177e4
LT		 1/*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
9 *
10 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
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
52#include <net/sock.h>
53#include <net/snmp.h>
54
55#include <net/ipv6.h>
56#include <net/protocol.h>
57#include <net/if_inet6.h>
58#include <net/ndisc.h>
59#include <net/addrconf.h>
60#include <net/ip6_route.h>
61
62#include <net/ip6_checksum.h>
63
64/* Set to 3 to get tracing... */
65#define MCAST_DEBUG 2
66
67#if MCAST_DEBUG >= 3
68#define MDBG(x) printk x
69#else
70#define MDBG(x)
71#endif
72
73/*
74 * These header formats should be in a separate include file, but icmpv6.h
75 * doesn't have in6_addr defined in all cases, there is no __u128, and no
76 * other files reference these.
77 *
78 * +-DLS 4/14/03
79 */
80
81/* Multicast Listener Discovery version 2 headers */
82
83struct mld2_grec {
84 __u8 grec_type;
85 __u8 grec_auxwords;
86 __u16 grec_nsrcs;
87 struct in6_addr grec_mca;
88 struct in6_addr grec_src[0];
89};
90
91struct mld2_report {
92 __u8 type;
93 __u8 resv1;
94 __u16 csum;
95 __u16 resv2;
96 __u16 ngrec;
97 struct mld2_grec grec[0];
98};
99
100struct mld2_query {
101 __u8 type;
102 __u8 code;
103 __u16 csum;
104 __u16 mrc;
105 __u16 resv1;
106 struct in6_addr mca;
107#if defined(__LITTLE_ENDIAN_BITFIELD)
108 __u8 qrv:3,
109 suppress:1,
110 resv2:4;
111#elif defined(__BIG_ENDIAN_BITFIELD)
112 __u8 resv2:4,
113 suppress:1,
114 qrv:3;
115#else
116#error "Please fix <asm/byteorder.h>"
117#endif
118 __u8 qqic;
119 __u16 nsrcs;
120 struct in6_addr srcs[0];
121};
122
123static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
124
125/* Big mc list lock for all the sockets */
126static DEFINE_RWLOCK(ipv6_sk_mc_lock);
127
128static struct socket *igmp6_socket;
129
130int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
131
132static void igmp6_join_group(struct ifmcaddr6 *ma);
133static void igmp6_leave_group(struct ifmcaddr6 *ma);
134static void igmp6_timer_handler(unsigned long data);
135
136static void mld_gq_timer_expire(unsigned long data);
137static void mld_ifc_timer_expire(unsigned long data);
138static void mld_ifc_event(struct inet6_dev *idev);
139static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
140static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
141static void mld_clear_delrec(struct inet6_dev *idev);
142static int sf_setstate(struct ifmcaddr6 *pmc);
143static void sf_markstate(struct ifmcaddr6 *pmc);
144static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
145static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
146 int sfmode, int sfcount, struct in6_addr *psfsrc,
147 int delta);
148static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
149 int sfmode, int sfcount, struct in6_addr *psfsrc,
150 int delta);
151static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
152 struct inet6_dev *idev);
153
154
155#define IGMP6_UNSOLICITED_IVAL (10*HZ)
156#define MLD_QRV_DEFAULT 2
157
158#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
159 (idev)->cnf.force_mld_version == 1 || \
160 ((idev)->mc_v1_seen && \
161 time_before(jiffies, (idev)->mc_v1_seen)))
162
163#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
164#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
165 ((value) < (thresh) ? (value) : \
f12baeab 166 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
1da177e4
LT		 167 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
168
169#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
170#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
171
6f4353d8 172#define IPV6_MLD_MAX_MSF 64
1da177e4
LT		 173
174int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF;
175
176/*
177 * socket join on multicast group
178 */
179
180int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
181{
182 struct net_device *dev = NULL;
183 struct ipv6_mc_socklist *mc_lst;
184 struct ipv6_pinfo *np = inet6_sk(sk);
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;
210 rt = rt6_lookup(addr, NULL, 0, 0);
211 if (rt) {
212 dev = rt->rt6i_dev;
213 dev_hold(dev);
214 dst_release(&rt->u.dst);
215 }
216 } else
217 dev = dev_get_by_index(ifindex);
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;
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
268 if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
269 struct inet6_dev *idev = in6_dev_get(dev);
270
271 if (idev) {
272 (void) ip6_mc_leave_src(sk,mc_lst,idev);
273 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
274 in6_dev_put(idev);
275 }
276 dev_put(dev);
277 }
278 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
279 return 0;
280 }
281 }
282 write_unlock_bh(&ipv6_sk_mc_lock);
283
9951f036 284 return -EADDRNOTAVAIL;
1da177e4
LT		 285}
286
287static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
288{
289 struct net_device *dev = NULL;
290 struct inet6_dev *idev = NULL;
291
292 if (ifindex == 0) {
293 struct rt6_info *rt;
294
295 rt = rt6_lookup(group, NULL, 0, 0);
296 if (rt) {
297 dev = rt->rt6i_dev;
298 dev_hold(dev);
299 dst_release(&rt->u.dst);
300 }
301 } else
302 dev = dev_get_by_index(ifindex);
303
304 if (!dev)
305 return NULL;
306 idev = in6_dev_get(dev);
307 if (!idev) {
308 dev_put(dev);
309 return NULL;
310 }
311 read_lock_bh(&idev->lock);
312 if (idev->dead) {
313 read_unlock_bh(&idev->lock);
314 in6_dev_put(idev);
315 dev_put(dev);
316 return NULL;
317 }
318 return idev;
319}
320
321void ipv6_sock_mc_close(struct sock *sk)
322{
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct ipv6_mc_socklist *mc_lst;
325
326 write_lock_bh(&ipv6_sk_mc_lock);
327 while ((mc_lst = np->ipv6_mc_list) != NULL) {
328 struct net_device *dev;
329
330 np->ipv6_mc_list = mc_lst->next;
331 write_unlock_bh(&ipv6_sk_mc_lock);
332
333 dev = dev_get_by_index(mc_lst->ifindex);
334 if (dev) {
335 struct inet6_dev *idev = in6_dev_get(dev);
336
337 if (idev) {
338 (void) ip6_mc_leave_src(sk, mc_lst, idev);
339 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
340 in6_dev_put(idev);
341 }
342 dev_put(dev);
343 }
344
345 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
346
347 write_lock_bh(&ipv6_sk_mc_lock);
348 }
349 write_unlock_bh(&ipv6_sk_mc_lock);
350}
351
352int ip6_mc_source(int add, int omode, struct sock *sk,
353 struct group_source_req *pgsr)
354{
355 struct in6_addr *source, *group;
356 struct ipv6_mc_socklist *pmc;
357 struct net_device *dev;
358 struct inet6_dev *idev;
359 struct ipv6_pinfo *inet6 = inet6_sk(sk);
360 struct ip6_sf_socklist *psl;
361 int i, j, rv;
c9e3e8b6 362 int leavegroup = 0;
5ab4a6c8 363 int pmclocked = 0;
1da177e4
LT		 364 int err;
365
366 if (pgsr->gsr_group.ss_family != AF_INET6 ||
367 pgsr->gsr_source.ss_family != AF_INET6)
368 return -EINVAL;
369
370 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
371 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
372
373 if (!ipv6_addr_is_multicast(group))
374 return -EINVAL;
375
376 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
377 if (!idev)
378 return -ENODEV;
379 dev = idev->dev;
380
381 err = -EADDRNOTAVAIL;
382
c9e3e8b6 383 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 384 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
385 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
386 continue;
387 if (ipv6_addr_equal(&pmc->addr, group))
388 break;
389 }
917f2f10
DS		 390 if (!pmc) { /* must have a prior join */
391 err = -EINVAL;
1da177e4 392 goto done;
917f2f10 393 }
1da177e4
LT		 394 /* if a source filter was set, must be the same mode as before */
395 if (pmc->sflist) {
917f2f10
DS		 396 if (pmc->sfmode != omode) {
397 err = -EINVAL;
1da177e4 398 goto done;
917f2f10 399 }
1da177e4
LT		 400 } else if (pmc->sfmode != omode) {
401 /* allow mode switches for empty-set filters */
402 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
403 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
404 pmc->sfmode = omode;
405 }
406
5ab4a6c8
DS		 407 write_lock_bh(&pmc->sflock);
408 pmclocked = 1;
409
1da177e4
LT		 410 psl = pmc->sflist;
411 if (!add) {
412 if (!psl)
917f2f10 413 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 414 rv = !0;
415 for (i=0; i<psl->sl_count; i++) {
416 rv = memcmp(&psl->sl_addr[i], source,
417 sizeof(struct in6_addr));
418 if (rv == 0)
419 break;
420 }
421 if (rv) /* source not found */
917f2f10 422 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 423
c9e3e8b6
DS		 424 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
425 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
426 leavegroup = 1;
427 goto done;
428 }
429
1da177e4
LT		 430 /* update the interface filter */
431 ip6_mc_del_src(idev, group, omode, 1, source, 1);
432
433 for (j=i+1; j<psl->sl_count; j++)
434 psl->sl_addr[j-1] = psl->sl_addr[j];
435 psl->sl_count--;
436 err = 0;
437 goto done;
438 }
439 /* else, add a new source to the filter */
440
441 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
442 err = -ENOBUFS;
443 goto done;
444 }
445 if (!psl || psl->sl_count == psl->sl_max) {
446 struct ip6_sf_socklist *newpsl;
447 int count = IP6_SFBLOCK;
448
449 if (psl)
450 count += psl->sl_max;
8b3a7005 451 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 452 if (!newpsl) {
453 err = -ENOBUFS;
454 goto done;
455 }
456 newpsl->sl_max = count;
457 newpsl->sl_count = count - IP6_SFBLOCK;
458 if (psl) {
459 for (i=0; i<psl->sl_count; i++)
460 newpsl->sl_addr[i] = psl->sl_addr[i];
461 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
462 }
463 pmc->sflist = psl = newpsl;
464 }
465 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
466 for (i=0; i<psl->sl_count; i++) {
467 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
468 if (rv == 0)
469 break;
470 }
471 if (rv == 0) /* address already there is an error */
472 goto done;
473 for (j=psl->sl_count-1; j>=i; j--)
474 psl->sl_addr[j+1] = psl->sl_addr[j];
475 psl->sl_addr[i] = *source;
476 psl->sl_count++;
477 err = 0;
478 /* update the interface list */
479 ip6_mc_add_src(idev, group, omode, 1, source, 1);
480done:
5ab4a6c8
DS		 481 if (pmclocked)
482 write_unlock_bh(&pmc->sflock);
c9e3e8b6 483 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 484 read_unlock_bh(&idev->lock);
485 in6_dev_put(idev);
486 dev_put(dev);
c9e3e8b6
DS		 487 if (leavegroup)
488 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 489 return err;
490}
491
492int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
493{
494 struct in6_addr *group;
495 struct ipv6_mc_socklist *pmc;
496 struct net_device *dev;
497 struct inet6_dev *idev;
498 struct ipv6_pinfo *inet6 = inet6_sk(sk);
499 struct ip6_sf_socklist *newpsl, *psl;
9951f036 500 int leavegroup = 0;
1da177e4
LT		 501 int i, err;
502
503 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
504
505 if (!ipv6_addr_is_multicast(group))
506 return -EINVAL;
507 if (gsf->gf_fmode != MCAST_INCLUDE &&
508 gsf->gf_fmode != MCAST_EXCLUDE)
509 return -EINVAL;
510
511 idev = ip6_mc_find_dev(group, gsf->gf_interface);
512
513 if (!idev)
514 return -ENODEV;
515 dev = idev->dev;
1da177e4 516
9c05989b 517 err = 0;
5ab4a6c8
DS		 518 read_lock_bh(&ipv6_sk_mc_lock);
519
9951f036
DS		 520 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
521 leavegroup = 1;
522 goto done;
523 }
524
1da177e4
LT		 525 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
526 if (pmc->ifindex != gsf->gf_interface)
527 continue;
528 if (ipv6_addr_equal(&pmc->addr, group))
529 break;
530 }
917f2f10
DS		 531 if (!pmc) { /* must have a prior join */
532 err = -EINVAL;
1da177e4 533 goto done;
917f2f10 534 }
1da177e4 535 if (gsf->gf_numsrc) {
8b3a7005
KK		 536 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
537 GFP_ATOMIC);
1da177e4
LT		 538 if (!newpsl) {
539 err = -ENOBUFS;
540 goto done;
541 }
542 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
543 for (i=0; i<newpsl->sl_count; ++i) {
544 struct sockaddr_in6 *psin6;
545
546 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
547 newpsl->sl_addr[i] = psin6->sin6_addr;
548 }
549 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
550 newpsl->sl_count, newpsl->sl_addr, 0);
551 if (err) {
552 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
553 goto done;
554 }
8713dbf0 555 } else {
1da177e4 556 newpsl = NULL;
8713dbf0
YZ		 557 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
558 }
5ab4a6c8
DS		 559
560 write_lock_bh(&pmc->sflock);
1da177e4
LT		 561 psl = pmc->sflist;
562 if (psl) {
563 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
564 psl->sl_count, psl->sl_addr, 0);
565 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
566 } else
567 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
568 pmc->sflist = newpsl;
569 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 570 write_unlock_bh(&pmc->sflock);
917f2f10 571 err = 0;
1da177e4 572done:
5ab4a6c8 573 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 574 read_unlock_bh(&idev->lock);
575 in6_dev_put(idev);
576 dev_put(dev);
9951f036
DS		 577 if (leavegroup)
578 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 579 return err;
580}
581
582int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
583 struct group_filter __user *optval, int __user *optlen)
584{
585 int err, i, count, copycount;
586 struct in6_addr *group;
587 struct ipv6_mc_socklist *pmc;
588 struct inet6_dev *idev;
589 struct net_device *dev;
590 struct ipv6_pinfo *inet6 = inet6_sk(sk);
591 struct ip6_sf_socklist *psl;
592
593 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
594
595 if (!ipv6_addr_is_multicast(group))
596 return -EINVAL;
597
598 idev = ip6_mc_find_dev(group, gsf->gf_interface);
599
600 if (!idev)
601 return -ENODEV;
602
603 dev = idev->dev;
604
605 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 606 /*
607 * changes to the ipv6_mc_list require the socket lock and
608 * a read lock on ip6_sk_mc_lock. We have the socket lock,
609 * so reading the list is safe.
610 */
1da177e4
LT		 611
612 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
613 if (pmc->ifindex != gsf->gf_interface)
614 continue;
615 if (ipv6_addr_equal(group, &pmc->addr))
616 break;
617 }
618 if (!pmc) /* must have a prior join */
619 goto done;
620 gsf->gf_fmode = pmc->sfmode;
621 psl = pmc->sflist;
622 count = psl ? psl->sl_count : 0;
623 read_unlock_bh(&idev->lock);
624 in6_dev_put(idev);
625 dev_put(dev);
626
627 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
628 gsf->gf_numsrc = count;
629 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
630 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
631 return -EFAULT;
632 }
5ab4a6c8
DS		 633 /* changes to psl require the socket lock, a read lock on
634 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
635 * have the socket lock, so reading here is safe.
636 */
1da177e4
LT		 637 for (i=0; i<copycount; i++) {
638 struct sockaddr_in6 *psin6;
639 struct sockaddr_storage ss;
640
641 psin6 = (struct sockaddr_in6 *)&ss;
642 memset(&ss, 0, sizeof(ss));
643 psin6->sin6_family = AF_INET6;
644 psin6->sin6_addr = psl->sl_addr[i];
645 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
646 return -EFAULT;
647 }
648 return 0;
649done:
650 read_unlock_bh(&idev->lock);
651 in6_dev_put(idev);
652 dev_put(dev);
653 return err;
654}
655
656int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
657 struct in6_addr *src_addr)
658{
659 struct ipv6_pinfo *np = inet6_sk(sk);
660 struct ipv6_mc_socklist *mc;
661 struct ip6_sf_socklist *psl;
662 int rv = 1;
663
664 read_lock(&ipv6_sk_mc_lock);
665 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
666 if (ipv6_addr_equal(&mc->addr, mc_addr))
667 break;
668 }
669 if (!mc) {
670 read_unlock(&ipv6_sk_mc_lock);
671 return 1;
672 }
5ab4a6c8 673 read_lock(&mc->sflock);
1da177e4
LT		 674 psl = mc->sflist;
675 if (!psl) {
676 rv = mc->sfmode == MCAST_EXCLUDE;
677 } else {
678 int i;
679
680 for (i=0; i<psl->sl_count; i++) {
681 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
682 break;
683 }
684 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
685 rv = 0;
686 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
687 rv = 0;
688 }
5ab4a6c8 689 read_unlock(&mc->sflock);
1da177e4
LT		 690 read_unlock(&ipv6_sk_mc_lock);
691
692 return rv;
693}
694
695static void ma_put(struct ifmcaddr6 *mc)
696{
697 if (atomic_dec_and_test(&mc->mca_refcnt)) {
698 in6_dev_put(mc->idev);
699 kfree(mc);
700 }
701}
702
703static void igmp6_group_added(struct ifmcaddr6 *mc)
704{
705 struct net_device *dev = mc->idev->dev;
706 char buf[MAX_ADDR_LEN];
707
708 spin_lock_bh(&mc->mca_lock);
709 if (!(mc->mca_flags&MAF_LOADED)) {
710 mc->mca_flags |= MAF_LOADED;
711 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
712 dev_mc_add(dev, buf, dev->addr_len, 0);
713 }
714 spin_unlock_bh(&mc->mca_lock);
715
716 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
717 return;
718
719 if (MLD_V1_SEEN(mc->idev)) {
720 igmp6_join_group(mc);
721 return;
722 }
723 /* else v2 */
724
725 mc->mca_crcount = mc->idev->mc_qrv;
726 mld_ifc_event(mc->idev);
727}
728
729static void igmp6_group_dropped(struct ifmcaddr6 *mc)
730{
731 struct net_device *dev = mc->idev->dev;
732 char buf[MAX_ADDR_LEN];
733
734 spin_lock_bh(&mc->mca_lock);
735 if (mc->mca_flags&MAF_LOADED) {
736 mc->mca_flags &= ~MAF_LOADED;
737 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
738 dev_mc_delete(dev, buf, dev->addr_len, 0);
739 }
740
741 if (mc->mca_flags & MAF_NOREPORT)
742 goto done;
743 spin_unlock_bh(&mc->mca_lock);
744
745 if (!mc->idev->dead)
746 igmp6_leave_group(mc);
747
748 spin_lock_bh(&mc->mca_lock);
749 if (del_timer(&mc->mca_timer))
750 atomic_dec(&mc->mca_refcnt);
751done:
752 ip6_mc_clear_src(mc);
753 spin_unlock_bh(&mc->mca_lock);
754}
755
756/*
757 * deleted ifmcaddr6 manipulation
758 */
759static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
760{
761 struct ifmcaddr6 *pmc;
762
763 /* this is an "ifmcaddr6" for convenience; only the fields below
764 * are actually used. In particular, the refcnt and users are not
765 * used for management of the delete list. Using the same structure
766 * for deleted items allows change reports to use common code with
767 * non-deleted or query-response MCA's.
768 */
0c600eda 769 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 770 if (!pmc)
771 return;
0c600eda 772
1da177e4
LT		 773 spin_lock_bh(&im->mca_lock);
774 spin_lock_init(&pmc->mca_lock);
775 pmc->idev = im->idev;
776 in6_dev_hold(idev);
777 pmc->mca_addr = im->mca_addr;
778 pmc->mca_crcount = idev->mc_qrv;
779 pmc->mca_sfmode = im->mca_sfmode;
780 if (pmc->mca_sfmode == MCAST_INCLUDE) {
781 struct ip6_sf_list *psf;
782
783 pmc->mca_tomb = im->mca_tomb;
784 pmc->mca_sources = im->mca_sources;
785 im->mca_tomb = im->mca_sources = NULL;
786 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
787 psf->sf_crcount = pmc->mca_crcount;
788 }
789 spin_unlock_bh(&im->mca_lock);
790
791 write_lock_bh(&idev->mc_lock);
792 pmc->next = idev->mc_tomb;
793 idev->mc_tomb = pmc;
794 write_unlock_bh(&idev->mc_lock);
795}
796
797static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
798{
799 struct ifmcaddr6 *pmc, *pmc_prev;
800 struct ip6_sf_list *psf, *psf_next;
801
802 write_lock_bh(&idev->mc_lock);
803 pmc_prev = NULL;
804 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
805 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
806 break;
807 pmc_prev = pmc;
808 }
809 if (pmc) {
810 if (pmc_prev)
811 pmc_prev->next = pmc->next;
812 else
813 idev->mc_tomb = pmc->next;
814 }
815 write_unlock_bh(&idev->mc_lock);
816 if (pmc) {
817 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
818 psf_next = psf->sf_next;
819 kfree(psf);
820 }
821 in6_dev_put(pmc->idev);
822 kfree(pmc);
823 }
824}
825
826static void mld_clear_delrec(struct inet6_dev *idev)
827{
828 struct ifmcaddr6 *pmc, *nextpmc;
829
830 write_lock_bh(&idev->mc_lock);
831 pmc = idev->mc_tomb;
832 idev->mc_tomb = NULL;
833 write_unlock_bh(&idev->mc_lock);
834
835 for (; pmc; pmc = nextpmc) {
836 nextpmc = pmc->next;
837 ip6_mc_clear_src(pmc);
838 in6_dev_put(pmc->idev);
839 kfree(pmc);
840 }
841
842 /* clear dead sources, too */
843 read_lock_bh(&idev->lock);
844 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
845 struct ip6_sf_list *psf, *psf_next;
846
847 spin_lock_bh(&pmc->mca_lock);
848 psf = pmc->mca_tomb;
849 pmc->mca_tomb = NULL;
850 spin_unlock_bh(&pmc->mca_lock);
851 for (; psf; psf=psf_next) {
852 psf_next = psf->sf_next;
853 kfree(psf);
854 }
855 }
856 read_unlock_bh(&idev->lock);
857}
858
859
860/*
861 * device multicast group inc (add if not found)
862 */
863int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
864{
865 struct ifmcaddr6 *mc;
866 struct inet6_dev *idev;
867
868 idev = in6_dev_get(dev);
869
870 if (idev == NULL)
871 return -EINVAL;
872
873 write_lock_bh(&idev->lock);
874 if (idev->dead) {
875 write_unlock_bh(&idev->lock);
876 in6_dev_put(idev);
877 return -ENODEV;
878 }
879
880 for (mc = idev->mc_list; mc; mc = mc->next) {
881 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
882 mc->mca_users++;
883 write_unlock_bh(&idev->lock);
884 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
885 NULL, 0);
886 in6_dev_put(idev);
887 return 0;
888 }
889 }
890
891 /*
892 * not found: create a new one.
893 */
894
0c600eda 895 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 896
897 if (mc == NULL) {
898 write_unlock_bh(&idev->lock);
899 in6_dev_put(idev);
900 return -ENOMEM;
901 }
902
1da177e4
LT		 903 init_timer(&mc->mca_timer);
904 mc->mca_timer.function = igmp6_timer_handler;
905 mc->mca_timer.data = (unsigned long) mc;
906
907 ipv6_addr_copy(&mc->mca_addr, addr);
908 mc->idev = idev;
909 mc->mca_users = 1;
910 /* mca_stamp should be updated upon changes */
911 mc->mca_cstamp = mc->mca_tstamp = jiffies;
912 atomic_set(&mc->mca_refcnt, 2);
913 spin_lock_init(&mc->mca_lock);
914
915 /* initial mode is (EX, empty) */
916 mc->mca_sfmode = MCAST_EXCLUDE;
917 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
918
919 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
920 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
921 mc->mca_flags |= MAF_NOREPORT;
922
923 mc->next = idev->mc_list;
924 idev->mc_list = mc;
925 write_unlock_bh(&idev->lock);
926
927 mld_del_delrec(idev, &mc->mca_addr);
928 igmp6_group_added(mc);
929 ma_put(mc);
930 return 0;
931}
932
933/*
934 * device multicast group del
935 */
936int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
937{
938 struct ifmcaddr6 *ma, **map;
939
940 write_lock_bh(&idev->lock);
941 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
942 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
943 if (--ma->mca_users == 0) {
944 *map = ma->next;
945 write_unlock_bh(&idev->lock);
946
947 igmp6_group_dropped(ma);
948
949 ma_put(ma);
950 return 0;
951 }
952 write_unlock_bh(&idev->lock);
953 return 0;
954 }
955 }
956 write_unlock_bh(&idev->lock);
957
958 return -ENOENT;
959}
960
961int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
962{
963 struct inet6_dev *idev = in6_dev_get(dev);
964 int err;
965
966 if (!idev)
967 return -ENODEV;
968
969 err = __ipv6_dev_mc_dec(idev, addr);
970
971 in6_dev_put(idev);
972
973 return err;
974}
975
976/*
977 * identify MLD packets for MLD filter exceptions
978 */
979int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
980{
981 struct icmp6hdr *pic;
982
983 if (nexthdr != IPPROTO_ICMPV6)
984 return 0;
985
986 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
987 return 0;
988
989 pic = (struct icmp6hdr *)skb->h.raw;
990
991 switch (pic->icmp6_type) {
992 case ICMPV6_MGM_QUERY:
993 case ICMPV6_MGM_REPORT:
994 case ICMPV6_MGM_REDUCTION:
995 case ICMPV6_MLD2_REPORT:
996 return 1;
997 default:
998 break;
999 }
1000 return 0;
1001}
1002
1003/*
1004 * check if the interface/address pair is valid
1005 */
1006int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1007 struct in6_addr *src_addr)
1008{
1009 struct inet6_dev *idev;
1010 struct ifmcaddr6 *mc;
1011 int rv = 0;
1012
1013 idev = in6_dev_get(dev);
1014 if (idev) {
1015 read_lock_bh(&idev->lock);
1016 for (mc = idev->mc_list; mc; mc=mc->next) {
1017 if (ipv6_addr_equal(&mc->mca_addr, group))
1018 break;
1019 }
1020 if (mc) {
1021 if (src_addr && !ipv6_addr_any(src_addr)) {
1022 struct ip6_sf_list *psf;
1023
1024 spin_lock_bh(&mc->mca_lock);
1025 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1026 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1027 break;
1028 }
1029 if (psf)
1030 rv = psf->sf_count[MCAST_INCLUDE] ||
1031 psf->sf_count[MCAST_EXCLUDE] !=
1032 mc->mca_sfcount[MCAST_EXCLUDE];
1033 else
1034 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1035 spin_unlock_bh(&mc->mca_lock);
1036 } else
1037 rv = 1; /* don't filter unspecified source */
1038 }
1039 read_unlock_bh(&idev->lock);
1040 in6_dev_put(idev);
1041 }
1042 return rv;
1043}
1044
1045static void mld_gq_start_timer(struct inet6_dev *idev)
1046{
1047 int tv = net_random() % idev->mc_maxdelay;
1048
1049 idev->mc_gq_running = 1;
1050 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1051 in6_dev_hold(idev);
1052}
1053
1054static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1055{
1056 int tv = net_random() % delay;
1057
1058 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1059 in6_dev_hold(idev);
1060}
1061
1062/*
1063 * IGMP handling (alias multicast ICMPv6 messages)
1064 */
1065
1066static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1067{
1068 unsigned long delay = resptime;
1069
1070 /* Do not start timer for these addresses */
1071 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1072 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1073 return;
1074
1075 if (del_timer(&ma->mca_timer)) {
1076 atomic_dec(&ma->mca_refcnt);
1077 delay = ma->mca_timer.expires - jiffies;
1078 }
1079
1080 if (delay >= resptime) {
1081 if (resptime)
1082 delay = net_random() % resptime;
1083 else
1084 delay = 1;
1085 }
1086 ma->mca_timer.expires = jiffies + delay;
1087 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1088 atomic_inc(&ma->mca_refcnt);
1089 ma->mca_flags |= MAF_TIMER_RUNNING;
1090}
1091
5ab4a6c8
DS		 1092/* mark EXCLUDE-mode sources */
1093static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1094 struct in6_addr *srcs)
1095{
1096 struct ip6_sf_list *psf;
1097 int i, scount;
1098
1099 scount = 0;
1100 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1101 if (scount == nsrcs)
1102 break;
5ab4a6c8
DS		 1103 for (i=0; i<nsrcs; i++) {
1104 /* skip inactive filters */
1105 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1106 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1107 psf->sf_count[MCAST_EXCLUDE])
1108 continue;
1109 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1110 scount++;
1111 break;
1112 }
1113 }
1114 }
1115 pmc->mca_flags &= ~MAF_GSQUERY;
1116 if (scount == nsrcs) /* all sources excluded */
1117 return 0;
1118 return 1;
1119}
1120
1121static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1122 struct in6_addr *srcs)
1123{
1124 struct ip6_sf_list *psf;
1125 int i, scount;
1126
1127 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1128 return mld_xmarksources(pmc, nsrcs, srcs);
1129
1130 /* mark INCLUDE-mode sources */
1131
1132 scount = 0;
1133 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1134 if (scount == nsrcs)
1135 break;
1136 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1137 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1138 psf->sf_gsresp = 1;
1139 scount++;
1140 break;
1141 }
5ab4a6c8
DS		 1142 }
1143 }
1144 if (!scount) {
1145 pmc->mca_flags &= ~MAF_GSQUERY;
1146 return 0;
1da177e4 1147 }
5ab4a6c8
DS		 1148 pmc->mca_flags |= MAF_GSQUERY;
1149 return 1;
1da177e4
LT		 1150}
1151
1152int igmp6_event_query(struct sk_buff *skb)
1153{
97300b5f 1154 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1155 struct ifmcaddr6 *ma;
1156 struct in6_addr *group;
1157 unsigned long max_delay;
1158 struct inet6_dev *idev;
1159 struct icmp6hdr *hdr;
1160 int group_type;
1161 int mark = 0;
1162 int len;
1163
1164 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1165 return -EINVAL;
1166
1167 /* compute payload length excluding extension headers */
1168 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1169 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1170
1171 /* Drop queries with not link local source */
1172 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1173 return -EINVAL;
1174
1175 idev = in6_dev_get(skb->dev);
1176
1177 if (idev == NULL)
1178 return 0;
1179
1180 hdr = (struct icmp6hdr *) skb->h.raw;
1181 group = (struct in6_addr *) (hdr + 1);
1182 group_type = ipv6_addr_type(group);
1183
1184 if (group_type != IPV6_ADDR_ANY &&
1185 !(group_type&IPV6_ADDR_MULTICAST)) {
1186 in6_dev_put(idev);
1187 return -EINVAL;
1188 }
1189
1190 if (len == 24) {
1191 int switchback;
1192 /* MLDv1 router present */
1193
1194 /* Translate milliseconds to jiffies */
1195 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1196
1197 switchback = (idev->mc_qrv + 1) * max_delay;
1198 idev->mc_v1_seen = jiffies + switchback;
1199
1200 /* cancel the interface change timer */
1201 idev->mc_ifc_count = 0;
1202 if (del_timer(&idev->mc_ifc_timer))
1203 __in6_dev_put(idev);
1204 /* clear deleted report items */
1205 mld_clear_delrec(idev);
1206 } else if (len >= 28) {
97300b5f
YZ		 1207 int srcs_offset = sizeof(struct mld2_query) -
1208 sizeof(struct icmp6hdr);
1209 if (!pskb_may_pull(skb, srcs_offset)) {
1210 in6_dev_put(idev);
1211 return -EINVAL;
1212 }
1213 mlh2 = (struct mld2_query *) skb->h.raw;
1da177e4
LT		 1214 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1215 if (!max_delay)
1216 max_delay = 1;
1217 idev->mc_maxdelay = max_delay;
1218 if (mlh2->qrv)
1219 idev->mc_qrv = mlh2->qrv;
1220 if (group_type == IPV6_ADDR_ANY) { /* general query */
1221 if (mlh2->nsrcs) {
1222 in6_dev_put(idev);
1223 return -EINVAL; /* no sources allowed */
1224 }
1225 mld_gq_start_timer(idev);
1226 in6_dev_put(idev);
1227 return 0;
1228 }
1229 /* mark sources to include, if group & source-specific */
97300b5f
YZ		 1230 if (mlh2->nsrcs != 0) {
1231 if (!pskb_may_pull(skb, srcs_offset +
5ab4a6c8 1232 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1233 in6_dev_put(idev);
1234 return -EINVAL;
1235 }
1236 mlh2 = (struct mld2_query *) skb->h.raw;
1237 mark = 1;
1238 }
1da177e4
LT		 1239 } else {
1240 in6_dev_put(idev);
1241 return -EINVAL;
1242 }
1243
1244 read_lock_bh(&idev->lock);
1245 if (group_type == IPV6_ADDR_ANY) {
1246 for (ma = idev->mc_list; ma; ma=ma->next) {
1247 spin_lock_bh(&ma->mca_lock);
1248 igmp6_group_queried(ma, max_delay);
1249 spin_unlock_bh(&ma->mca_lock);
1250 }
1251 } else {
1252 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1253 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1254 continue;
1255 spin_lock_bh(&ma->mca_lock);
1256 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1257 /* gsquery <- gsquery && mark */
1258 if (!mark)
1259 ma->mca_flags &= ~MAF_GSQUERY;
1260 } else {
1261 /* gsquery <- mark */
1262 if (mark)
1263 ma->mca_flags |= MAF_GSQUERY;
1264 else
1265 ma->mca_flags &= ~MAF_GSQUERY;
1266 }
5ab4a6c8 1267 if (!(ma->mca_flags & MAF_GSQUERY) ||
7add2a43 1268 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
5ab4a6c8 1269 igmp6_group_queried(ma, max_delay);
1da177e4 1270 spin_unlock_bh(&ma->mca_lock);
7add2a43 1271 break;
1da177e4
LT		 1272 }
1273 }
1274 read_unlock_bh(&idev->lock);
1275 in6_dev_put(idev);
1276
1277 return 0;
1278}
1279
1280
1281int igmp6_event_report(struct sk_buff *skb)
1282{
1283 struct ifmcaddr6 *ma;
1284 struct in6_addr *addrp;
1285 struct inet6_dev *idev;
1286 struct icmp6hdr *hdr;
1287 int addr_type;
1288
1289 /* Our own report looped back. Ignore it. */
1290 if (skb->pkt_type == PACKET_LOOPBACK)
1291 return 0;
1292
24c69275
DS		 1293 /* send our report if the MC router may not have heard this report */
1294 if (skb->pkt_type != PACKET_MULTICAST &&
1295 skb->pkt_type != PACKET_BROADCAST)
1296 return 0;
1297
1da177e4
LT		 1298 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1299 return -EINVAL;
1300
1301 hdr = (struct icmp6hdr*) skb->h.raw;
1302
1303 /* Drop reports with not link local source */
1304 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1305 if (addr_type != IPV6_ADDR_ANY &&
1306 !(addr_type&IPV6_ADDR_LINKLOCAL))
1307 return -EINVAL;
1308
1309 addrp = (struct in6_addr *) (hdr + 1);
1310
1311 idev = in6_dev_get(skb->dev);
1312 if (idev == NULL)
1313 return -ENODEV;
1314
1315 /*
1316 * Cancel the timer for this group
1317 */
1318
1319 read_lock_bh(&idev->lock);
1320 for (ma = idev->mc_list; ma; ma=ma->next) {
1321 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1322 spin_lock(&ma->mca_lock);
1323 if (del_timer(&ma->mca_timer))
1324 atomic_dec(&ma->mca_refcnt);
1325 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1326 spin_unlock(&ma->mca_lock);
1327 break;
1328 }
1329 }
1330 read_unlock_bh(&idev->lock);
1331 in6_dev_put(idev);
1332 return 0;
1333}
1334
1335static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1336 int gdeleted, int sdeleted)
1337{
1338 switch (type) {
1339 case MLD2_MODE_IS_INCLUDE:
1340 case MLD2_MODE_IS_EXCLUDE:
1341 if (gdeleted || sdeleted)
1342 return 0;
5ab4a6c8
DS		 1343 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1344 if (pmc->mca_sfmode == MCAST_INCLUDE)
1345 return 1;
1346 /* don't include if this source is excluded
1347 * in all filters
1348 */
1349 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1350 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1351 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1352 psf->sf_count[MCAST_EXCLUDE];
1353 }
1354 return 0;
1da177e4
LT		 1355 case MLD2_CHANGE_TO_INCLUDE:
1356 if (gdeleted || sdeleted)
1357 return 0;
1358 return psf->sf_count[MCAST_INCLUDE] != 0;
1359 case MLD2_CHANGE_TO_EXCLUDE:
1360 if (gdeleted || sdeleted)
1361 return 0;
1362 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1363 psf->sf_count[MCAST_INCLUDE])
1364 return 0;
1365 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1366 psf->sf_count[MCAST_EXCLUDE];
1367 case MLD2_ALLOW_NEW_SOURCES:
1368 if (gdeleted || !psf->sf_crcount)
1369 return 0;
1370 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1371 case MLD2_BLOCK_OLD_SOURCES:
1372 if (pmc->mca_sfmode == MCAST_INCLUDE)
1373 return gdeleted || (psf->sf_crcount && sdeleted);
1374 return psf->sf_crcount && !gdeleted && !sdeleted;
1375 }
1376 return 0;
1377}
1378
1379static int
1380mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1381{
1382 struct ip6_sf_list *psf;
1383 int scount = 0;
1384
1385 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1386 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1387 continue;
1388 scount++;
1389 }
1390 return scount;
1391}
1392
1393static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1394{
1395 struct sock *sk = igmp6_socket->sk;
1396 struct sk_buff *skb;
1397 struct mld2_report *pmr;
1398 struct in6_addr addr_buf;
1399 int err;
1400 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1401 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1402 IPV6_TLV_PADN, 0 };
1403
1404 /* we assume size > sizeof(ra) here */
1405 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1406
1407 if (skb == 0)
1408 return NULL;
1409
1410 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1411
1412 if (ipv6_get_lladdr(dev, &addr_buf)) {
1413 /* <draft-ietf-magma-mld-source-05.txt>:
1414 * use unspecified address as the source address
1415 * when a valid link-local address is not available.
1416 */
1417 memset(&addr_buf, 0, sizeof(addr_buf));
1418 }
1419
1420 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1421
1422 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1423
1424 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1425 skb->h.raw = (unsigned char *)pmr;
1426 pmr->type = ICMPV6_MLD2_REPORT;
1427 pmr->resv1 = 0;
1428 pmr->csum = 0;
1429 pmr->resv2 = 0;
1430 pmr->ngrec = 0;
1431 return skb;
1432}
1433
e9823185
PM		 1434static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1435{
1436 struct net_device *dev = skb->dev;
1437
1438 if (dev->hard_header) {
1439 unsigned char ha[MAX_ADDR_LEN];
1440 int err;
1441
1442 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1443 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1444 if (err < 0) {
1445 kfree_skb(skb);
1446 return err;
1447 }
1448 }
1449 return dev_queue_xmit(skb);
1450}
1451
1452static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1453{
1454 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1455 mld_dev_queue_xmit2);
1456}
1457
1da177e4
LT		 1458static void mld_sendpack(struct sk_buff *skb)
1459{
1460 struct ipv6hdr *pip6 = skb->nh.ipv6h;
1461 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1462 int payload_len, mldlen;
1463 struct inet6_dev *idev = in6_dev_get(skb->dev);
1464 int err;
1465
1466 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1467 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1468 sizeof(struct ipv6hdr);
1469 mldlen = skb->tail - skb->h.raw;
1470 pip6->payload_len = htons(payload_len);
1471
1472 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1473 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1474 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1475 mld_dev_queue_xmit);
1da177e4
LT		 1476 if (!err) {
1477 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1478 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1479 } else
1480 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1481
1482 if (likely(idev != NULL))
1483 in6_dev_put(idev);
1484}
1485
1486static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1487{
fab10fe3 1488 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1489}
1490
1491static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1492 int type, struct mld2_grec **ppgr)
1493{
1494 struct net_device *dev = pmc->idev->dev;
1495 struct mld2_report *pmr;
1496 struct mld2_grec *pgr;
1497
1498 if (!skb)
1499 skb = mld_newpack(dev, dev->mtu);
1500 if (!skb)
1501 return NULL;
1502 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1503 pgr->grec_type = type;
1504 pgr->grec_auxwords = 0;
1505 pgr->grec_nsrcs = 0;
1506 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1507 pmr = (struct mld2_report *)skb->h.raw;
1508 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1509 *ppgr = pgr;
1510 return skb;
1511}
1512
1513#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1514 skb_tailroom(skb)) : 0)
1515
1516static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1517 int type, int gdeleted, int sdeleted)
1518{
1519 struct net_device *dev = pmc->idev->dev;
1520 struct mld2_report *pmr;
1521 struct mld2_grec *pgr = NULL;
1522 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1523 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1524
1525 if (pmc->mca_flags & MAF_NOREPORT)
1526 return skb;
1527
1528 isquery = type == MLD2_MODE_IS_INCLUDE ||
1529 type == MLD2_MODE_IS_EXCLUDE;
1530 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1531 type == MLD2_CHANGE_TO_EXCLUDE;
1532
5ab4a6c8
DS		 1533 stotal = scount = 0;
1534
1da177e4
LT		 1535 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1536
5ab4a6c8
DS		 1537 if (!*psf_list)
1538 goto empty_source;
1539
1da177e4
LT		 1540 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1541
1542 /* EX and TO_EX get a fresh packet, if needed */
1543 if (truncate) {
1544 if (pmr && pmr->ngrec &&
1545 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1546 if (skb)
1547 mld_sendpack(skb);
1548 skb = mld_newpack(dev, dev->mtu);
1549 }
1550 }
1551 first = 1;
1da177e4
LT		 1552 psf_prev = NULL;
1553 for (psf=*psf_list; psf; psf=psf_next) {
1554 struct in6_addr *psrc;
1555
1556 psf_next = psf->sf_next;
1557
1558 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1559 psf_prev = psf;
1560 continue;
1561 }
1562
1563 /* clear marks on query responses */
1564 if (isquery)
1565 psf->sf_gsresp = 0;
1566
1567 if (AVAILABLE(skb) < sizeof(*psrc) +
1568 first*sizeof(struct mld2_grec)) {
1569 if (truncate && !first)
1570 break; /* truncate these */
1571 if (pgr)
1572 pgr->grec_nsrcs = htons(scount);
1573 if (skb)
1574 mld_sendpack(skb);
1575 skb = mld_newpack(dev, dev->mtu);
1576 first = 1;
1577 scount = 0;
1578 }
1579 if (first) {
1580 skb = add_grhead(skb, pmc, type, &pgr);
1581 first = 0;
1582 }
1583 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1584 *psrc = psf->sf_addr;
5ab4a6c8 1585 scount++; stotal++;
1da177e4
LT		 1586 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1587 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1588 psf->sf_crcount--;
1589 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1590 if (psf_prev)
1591 psf_prev->sf_next = psf->sf_next;
1592 else
1593 *psf_list = psf->sf_next;
1594 kfree(psf);
1595 continue;
1596 }
1597 }
1598 psf_prev = psf;
1599 }
5ab4a6c8
DS		 1600
1601empty_source:
1602 if (!stotal) {
1603 if (type == MLD2_ALLOW_NEW_SOURCES ||
1604 type == MLD2_BLOCK_OLD_SOURCES)
1605 return skb;
1606 if (pmc->mca_crcount || isquery) {
1607 /* make sure we have room for group header */
1608 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1609 mld_sendpack(skb);
1610 skb = NULL; /* add_grhead will get a new one */
1611 }
1612 skb = add_grhead(skb, pmc, type, &pgr);
1613 }
1614 }
1da177e4
LT		 1615 if (pgr)
1616 pgr->grec_nsrcs = htons(scount);
1617
1618 if (isquery)
1619 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1620 return skb;
1621}
1622
1623static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1624{
1625 struct sk_buff *skb = NULL;
1626 int type;
1627
1628 if (!pmc) {
1629 read_lock_bh(&idev->lock);
1630 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1631 if (pmc->mca_flags & MAF_NOREPORT)
1632 continue;
1633 spin_lock_bh(&pmc->mca_lock);
1634 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1635 type = MLD2_MODE_IS_EXCLUDE;
1636 else
1637 type = MLD2_MODE_IS_INCLUDE;
1638 skb = add_grec(skb, pmc, type, 0, 0);
1639 spin_unlock_bh(&pmc->mca_lock);
1640 }
1641 read_unlock_bh(&idev->lock);
1642 } else {
1643 spin_lock_bh(&pmc->mca_lock);
1644 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1645 type = MLD2_MODE_IS_EXCLUDE;
1646 else
1647 type = MLD2_MODE_IS_INCLUDE;
1648 skb = add_grec(skb, pmc, type, 0, 0);
1649 spin_unlock_bh(&pmc->mca_lock);
1650 }
1651 if (skb)
1652 mld_sendpack(skb);
1653}
1654
1655/*
1656 * remove zero-count source records from a source filter list
1657 */
1658static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1659{
1660 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1661
1662 psf_prev = NULL;
1663 for (psf=*ppsf; psf; psf = psf_next) {
1664 psf_next = psf->sf_next;
1665 if (psf->sf_crcount == 0) {
1666 if (psf_prev)
1667 psf_prev->sf_next = psf->sf_next;
1668 else
1669 *ppsf = psf->sf_next;
1670 kfree(psf);
1671 } else
1672 psf_prev = psf;
1673 }
1674}
1675
1676static void mld_send_cr(struct inet6_dev *idev)
1677{
1678 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1679 struct sk_buff *skb = NULL;
1680 int type, dtype;
1681
1682 read_lock_bh(&idev->lock);
1683 write_lock_bh(&idev->mc_lock);
1684
1685 /* deleted MCA's */
1686 pmc_prev = NULL;
1687 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1688 pmc_next = pmc->next;
1689 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1690 type = MLD2_BLOCK_OLD_SOURCES;
1691 dtype = MLD2_BLOCK_OLD_SOURCES;
1692 skb = add_grec(skb, pmc, type, 1, 0);
1693 skb = add_grec(skb, pmc, dtype, 1, 1);
1694 }
1695 if (pmc->mca_crcount) {
1da177e4
LT		 1696 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1697 type = MLD2_CHANGE_TO_INCLUDE;
1698 skb = add_grec(skb, pmc, type, 1, 0);
1699 }
5ab4a6c8 1700 pmc->mca_crcount--;
1da177e4
LT		 1701 if (pmc->mca_crcount == 0) {
1702 mld_clear_zeros(&pmc->mca_tomb);
1703 mld_clear_zeros(&pmc->mca_sources);
1704 }
1705 }
1706 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1707 !pmc->mca_sources) {
1708 if (pmc_prev)
1709 pmc_prev->next = pmc_next;
1710 else
1711 idev->mc_tomb = pmc_next;
1712 in6_dev_put(pmc->idev);
1713 kfree(pmc);
1714 } else
1715 pmc_prev = pmc;
1716 }
1717 write_unlock_bh(&idev->mc_lock);
1718
1719 /* change recs */
1720 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1721 spin_lock_bh(&pmc->mca_lock);
1722 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1723 type = MLD2_BLOCK_OLD_SOURCES;
1724 dtype = MLD2_ALLOW_NEW_SOURCES;
1725 } else {
1726 type = MLD2_ALLOW_NEW_SOURCES;
1727 dtype = MLD2_BLOCK_OLD_SOURCES;
1728 }
1729 skb = add_grec(skb, pmc, type, 0, 0);
1730 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1731
1732 /* filter mode changes */
1733 if (pmc->mca_crcount) {
1da177e4
LT		 1734 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1735 type = MLD2_CHANGE_TO_EXCLUDE;
1736 else
1737 type = MLD2_CHANGE_TO_INCLUDE;
1738 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1739 pmc->mca_crcount--;
1da177e4
LT		 1740 }
1741 spin_unlock_bh(&pmc->mca_lock);
1742 }
1743 read_unlock_bh(&idev->lock);
1744 if (!skb)
1745 return;
1746 (void) mld_sendpack(skb);
1747}
1748
1749static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1750{
1751 struct sock *sk = igmp6_socket->sk;
1752 struct inet6_dev *idev;
1753 struct sk_buff *skb;
1754 struct icmp6hdr *hdr;
1755 struct in6_addr *snd_addr;
1756 struct in6_addr *addrp;
1757 struct in6_addr addr_buf;
1758 struct in6_addr all_routers;
1759 int err, len, payload_len, full_len;
1760 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1761 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1762 IPV6_TLV_PADN, 0 };
1763
1764 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1765 snd_addr = addr;
1766 if (type == ICMPV6_MGM_REDUCTION) {
1767 snd_addr = &all_routers;
1768 ipv6_addr_all_routers(&all_routers);
1769 }
1770
1771 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1772 payload_len = len + sizeof(ra);
1773 full_len = sizeof(struct ipv6hdr) + payload_len;
1774
1775 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1776
1777 if (skb == NULL) {
1778 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1779 return;
1780 }
1781
1782 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1783
1784 if (ipv6_get_lladdr(dev, &addr_buf)) {
1785 /* <draft-ietf-magma-mld-source-05.txt>:
1786 * use unspecified address as the source address
1787 * when a valid link-local address is not available.
1788 */
1789 memset(&addr_buf, 0, sizeof(addr_buf));
1790 }
1791
1792 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1793
1794 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1795
1796 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1797 memset(hdr, 0, sizeof(struct icmp6hdr));
1798 hdr->icmp6_type = type;
1799
1800 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1801 ipv6_addr_copy(addrp, addr);
1802
1803 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1804 IPPROTO_ICMPV6,
1805 csum_partial((__u8 *) hdr, len, 0));
1806
1807 idev = in6_dev_get(skb->dev);
1808
1809 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1810 mld_dev_queue_xmit);
1da177e4
LT		 1811 if (!err) {
1812 if (type == ICMPV6_MGM_REDUCTION)
1813 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1814 else
1815 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1816 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1817 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1818 } else
1819 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1820
1821 if (likely(idev != NULL))
1822 in6_dev_put(idev);
1823 return;
1da177e4
LT		 1824}
1825
1826static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1827 struct in6_addr *psfsrc)
1828{
1829 struct ip6_sf_list *psf, *psf_prev;
1830 int rv = 0;
1831
1832 psf_prev = NULL;
1833 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1834 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1835 break;
1836 psf_prev = psf;
1837 }
1838 if (!psf || psf->sf_count[sfmode] == 0) {
1839 /* source filter not found, or count wrong => bug */
1840 return -ESRCH;
1841 }
1842 psf->sf_count[sfmode]--;
1843 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1844 struct inet6_dev *idev = pmc->idev;
1845
1846 /* no more filters for this source */
1847 if (psf_prev)
1848 psf_prev->sf_next = psf->sf_next;
1849 else
1850 pmc->mca_sources = psf->sf_next;
1851 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1852 !MLD_V1_SEEN(idev)) {
1853 psf->sf_crcount = idev->mc_qrv;
1854 psf->sf_next = pmc->mca_tomb;
1855 pmc->mca_tomb = psf;
1856 rv = 1;
1857 } else
1858 kfree(psf);
1859 }
1860 return rv;
1861}
1862
1863static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1864 int sfmode, int sfcount, struct in6_addr *psfsrc,
1865 int delta)
1866{
1867 struct ifmcaddr6 *pmc;
1868 int changerec = 0;
1869 int i, err;
1870
1871 if (!idev)
1872 return -ENODEV;
1873 read_lock_bh(&idev->lock);
1874 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1875 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1876 break;
1877 }
1878 if (!pmc) {
1879 /* MCA not found?? bug */
1880 read_unlock_bh(&idev->lock);
1881 return -ESRCH;
1882 }
1883 spin_lock_bh(&pmc->mca_lock);
1884 sf_markstate(pmc);
1885 if (!delta) {
1886 if (!pmc->mca_sfcount[sfmode]) {
1887 spin_unlock_bh(&pmc->mca_lock);
1888 read_unlock_bh(&idev->lock);
1889 return -EINVAL;
1890 }
1891 pmc->mca_sfcount[sfmode]--;
1892 }
1893 err = 0;
1894 for (i=0; i<sfcount; i++) {
1895 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1896
1897 changerec |= rv > 0;
1898 if (!err && rv < 0)
1899 err = rv;
1900 }
1901 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1902 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1903 pmc->mca_sfcount[MCAST_INCLUDE]) {
1904 struct ip6_sf_list *psf;
1905
1906 /* filter mode change */
1907 pmc->mca_sfmode = MCAST_INCLUDE;
1908 pmc->mca_crcount = idev->mc_qrv;
1909 idev->mc_ifc_count = pmc->mca_crcount;
1910 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1911 psf->sf_crcount = 0;
1912 mld_ifc_event(pmc->idev);
1913 } else if (sf_setstate(pmc) || changerec)
1914 mld_ifc_event(pmc->idev);
1915 spin_unlock_bh(&pmc->mca_lock);
1916 read_unlock_bh(&idev->lock);
1917 return err;
1918}
1919
1920/*
1921 * Add multicast single-source filter to the interface list
1922 */
1923static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1924 struct in6_addr *psfsrc, int delta)
1925{
1926 struct ip6_sf_list *psf, *psf_prev;
1927
1928 psf_prev = NULL;
1929 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1930 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1931 break;
1932 psf_prev = psf;
1933 }
1934 if (!psf) {
0c600eda 1935 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1936 if (!psf)
1937 return -ENOBUFS;
0c600eda 1938
1da177e4
LT		 1939 psf->sf_addr = *psfsrc;
1940 if (psf_prev) {
1941 psf_prev->sf_next = psf;
1942 } else
1943 pmc->mca_sources = psf;
1944 }
1945 psf->sf_count[sfmode]++;
1946 return 0;
1947}
1948
1949static void sf_markstate(struct ifmcaddr6 *pmc)
1950{
1951 struct ip6_sf_list *psf;
1952 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1953
1954 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1955 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1956 psf->sf_oldin = mca_xcount ==
1957 psf->sf_count[MCAST_EXCLUDE] &&
1958 !psf->sf_count[MCAST_INCLUDE];
1959 } else
1960 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1961}
1962
1963static int sf_setstate(struct ifmcaddr6 *pmc)
1964{
7add2a43 1965 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 1966 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1967 int qrv = pmc->idev->mc_qrv;
1968 int new_in, rv;
1969
1970 rv = 0;
1971 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1972 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1973 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1974 !psf->sf_count[MCAST_INCLUDE];
1975 } else
1976 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 1977 if (new_in) {
1978 if (!psf->sf_oldin) {
e80e28b6 1979 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 1980
1981 for (dpsf=pmc->mca_tomb; dpsf;
1982 dpsf=dpsf->sf_next) {
1983 if (ipv6_addr_equal(&dpsf->sf_addr,
1984 &psf->sf_addr))
1985 break;
1986 prev = dpsf;
1987 }
1988 if (dpsf) {
1989 if (prev)
1990 prev->sf_next = dpsf->sf_next;
1991 else
1992 pmc->mca_tomb = dpsf->sf_next;
1993 kfree(dpsf);
1994 }
1995 psf->sf_crcount = qrv;
1996 rv++;
1997 }
1998 } else if (psf->sf_oldin) {
1999 psf->sf_crcount = 0;
2000 /*
2001 * add or update "delete" records if an active filter
2002 * is now inactive
2003 */
2004 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2005 if (ipv6_addr_equal(&dpsf->sf_addr,
2006 &psf->sf_addr))
2007 break;
2008 if (!dpsf) {
2009 dpsf = (struct ip6_sf_list *)
2010 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2011 if (!dpsf)
2012 continue;
2013 *dpsf = *psf;
2014 /* pmc->mca_lock held by callers */
2015 dpsf->sf_next = pmc->mca_tomb;
2016 pmc->mca_tomb = dpsf;
2017 }
2018 dpsf->sf_crcount = qrv;
1da177e4
LT		 2019 rv++;
2020 }
2021 }
2022 return rv;
2023}
2024
2025/*
2026 * Add multicast source filter list to the interface list
2027 */
2028static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2029 int sfmode, int sfcount, struct in6_addr *psfsrc,
2030 int delta)
2031{
2032 struct ifmcaddr6 *pmc;
2033 int isexclude;
2034 int i, err;
2035
2036 if (!idev)
2037 return -ENODEV;
2038 read_lock_bh(&idev->lock);
2039 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2040 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2041 break;
2042 }
2043 if (!pmc) {
2044 /* MCA not found?? bug */
2045 read_unlock_bh(&idev->lock);
2046 return -ESRCH;
2047 }
2048 spin_lock_bh(&pmc->mca_lock);
2049
2050 sf_markstate(pmc);
2051 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2052 if (!delta)
2053 pmc->mca_sfcount[sfmode]++;
2054 err = 0;
2055 for (i=0; i<sfcount; i++) {
2056 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2057 if (err)
2058 break;
2059 }
2060 if (err) {
2061 int j;
2062
2063 if (!delta)
2064 pmc->mca_sfcount[sfmode]--;
2065 for (j=0; j<i; j++)
2066 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2067 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2068 struct inet6_dev *idev = pmc->idev;
2069 struct ip6_sf_list *psf;
2070
2071 /* filter mode change */
2072 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2073 pmc->mca_sfmode = MCAST_EXCLUDE;
2074 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2075 pmc->mca_sfmode = MCAST_INCLUDE;
2076 /* else no filters; keep old mode for reports */
2077
2078 pmc->mca_crcount = idev->mc_qrv;
2079 idev->mc_ifc_count = pmc->mca_crcount;
2080 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2081 psf->sf_crcount = 0;
2082 mld_ifc_event(idev);
2083 } else if (sf_setstate(pmc))
2084 mld_ifc_event(idev);
2085 spin_unlock_bh(&pmc->mca_lock);
2086 read_unlock_bh(&idev->lock);
2087 return err;
2088}
2089
2090static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2091{
2092 struct ip6_sf_list *psf, *nextpsf;
2093
2094 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2095 nextpsf = psf->sf_next;
2096 kfree(psf);
2097 }
2098 pmc->mca_tomb = NULL;
2099 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2100 nextpsf = psf->sf_next;
2101 kfree(psf);
2102 }
2103 pmc->mca_sources = NULL;
2104 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2105 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2106 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2107}
2108
2109
2110static void igmp6_join_group(struct ifmcaddr6 *ma)
2111{
2112 unsigned long delay;
2113
2114 if (ma->mca_flags & MAF_NOREPORT)
2115 return;
2116
2117 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2118
2119 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2120
2121 spin_lock_bh(&ma->mca_lock);
2122 if (del_timer(&ma->mca_timer)) {
2123 atomic_dec(&ma->mca_refcnt);
2124 delay = ma->mca_timer.expires - jiffies;
2125 }
2126
2127 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2128 atomic_inc(&ma->mca_refcnt);
2129 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2130 spin_unlock_bh(&ma->mca_lock);
2131}
2132
2133static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2134 struct inet6_dev *idev)
2135{
2136 int err;
2137
5ab4a6c8
DS		 2138 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2139 * so no other readers or writers of iml or its sflist
2140 */
1da177e4
LT		 2141 if (iml->sflist == 0) {
2142 /* any-source empty exclude case */
2143 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2144 }
2145 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2146 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2147 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2148 iml->sflist = NULL;
2149 return err;
2150}
2151
2152static void igmp6_leave_group(struct ifmcaddr6 *ma)
2153{
2154 if (MLD_V1_SEEN(ma->idev)) {
2155 if (ma->mca_flags & MAF_LAST_REPORTER)
2156 igmp6_send(&ma->mca_addr, ma->idev->dev,
2157 ICMPV6_MGM_REDUCTION);
2158 } else {
2159 mld_add_delrec(ma->idev, ma);
2160 mld_ifc_event(ma->idev);
2161 }
2162}
2163
2164static void mld_gq_timer_expire(unsigned long data)
2165{
2166 struct inet6_dev *idev = (struct inet6_dev *)data;
2167
2168 idev->mc_gq_running = 0;
2169 mld_send_report(idev, NULL);
2170 __in6_dev_put(idev);
2171}
2172
2173static void mld_ifc_timer_expire(unsigned long data)
2174{
2175 struct inet6_dev *idev = (struct inet6_dev *)data;
2176
2177 mld_send_cr(idev);
2178 if (idev->mc_ifc_count) {
2179 idev->mc_ifc_count--;
2180 if (idev->mc_ifc_count)
2181 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2182 }
2183 __in6_dev_put(idev);
2184}
2185
2186static void mld_ifc_event(struct inet6_dev *idev)
2187{
2188 if (MLD_V1_SEEN(idev))
2189 return;
2190 idev->mc_ifc_count = idev->mc_qrv;
2191 mld_ifc_start_timer(idev, 1);
2192}
2193
2194
2195static void igmp6_timer_handler(unsigned long data)
2196{
2197 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2198
2199 if (MLD_V1_SEEN(ma->idev))
2200 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2201 else
2202 mld_send_report(ma->idev, ma);
2203
2204 spin_lock(&ma->mca_lock);
2205 ma->mca_flags |= MAF_LAST_REPORTER;
2206 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2207 spin_unlock(&ma->mca_lock);
2208 ma_put(ma);
2209}
2210
2211/* Device going down */
2212
2213void ipv6_mc_down(struct inet6_dev *idev)
2214{
2215 struct ifmcaddr6 *i;
2216
2217 /* Withdraw multicast list */
2218
2219 read_lock_bh(&idev->lock);
2220 idev->mc_ifc_count = 0;
2221 if (del_timer(&idev->mc_ifc_timer))
2222 __in6_dev_put(idev);
2223 idev->mc_gq_running = 0;
2224 if (del_timer(&idev->mc_gq_timer))
2225 __in6_dev_put(idev);
2226
2227 for (i = idev->mc_list; i; i=i->next)
2228 igmp6_group_dropped(i);
2229 read_unlock_bh(&idev->lock);
2230
2231 mld_clear_delrec(idev);
2232}
2233
2234
2235/* Device going up */
2236
2237void ipv6_mc_up(struct inet6_dev *idev)
2238{
2239 struct ifmcaddr6 *i;
2240
2241 /* Install multicast list, except for all-nodes (already installed) */
2242
2243 read_lock_bh(&idev->lock);
2244 for (i = idev->mc_list; i; i=i->next)
2245 igmp6_group_added(i);
2246 read_unlock_bh(&idev->lock);
2247}
2248
2249/* IPv6 device initialization. */
2250
2251void ipv6_mc_init_dev(struct inet6_dev *idev)
2252{
2253 struct in6_addr maddr;
2254
2255 write_lock_bh(&idev->lock);
2256 rwlock_init(&idev->mc_lock);
2257 idev->mc_gq_running = 0;
2258 init_timer(&idev->mc_gq_timer);
2259 idev->mc_gq_timer.data = (unsigned long) idev;
2260 idev->mc_gq_timer.function = &mld_gq_timer_expire;
2261 idev->mc_tomb = NULL;
2262 idev->mc_ifc_count = 0;
2263 init_timer(&idev->mc_ifc_timer);
2264 idev->mc_ifc_timer.data = (unsigned long) idev;
2265 idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2266 idev->mc_qrv = MLD_QRV_DEFAULT;
2267 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2268 idev->mc_v1_seen = 0;
2269 write_unlock_bh(&idev->lock);
2270
2271 /* Add all-nodes address. */
2272 ipv6_addr_all_nodes(&maddr);
2273 ipv6_dev_mc_inc(idev->dev, &maddr);
2274}
2275
2276/*
2277 * Device is about to be destroyed: clean up.
2278 */
2279
2280void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2281{
2282 struct ifmcaddr6 *i;
2283 struct in6_addr maddr;
2284
2285 /* Deactivate timers */
2286 ipv6_mc_down(idev);
2287
2288 /* Delete all-nodes address. */
2289 ipv6_addr_all_nodes(&maddr);
2290
2291 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2292 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2293 * fail.
2294 */
2295 __ipv6_dev_mc_dec(idev, &maddr);
2296
2297 if (idev->cnf.forwarding) {
2298 ipv6_addr_all_routers(&maddr);
2299 __ipv6_dev_mc_dec(idev, &maddr);
2300 }
2301
2302 write_lock_bh(&idev->lock);
2303 while ((i = idev->mc_list) != NULL) {
2304 idev->mc_list = i->next;
2305 write_unlock_bh(&idev->lock);
2306
2307 igmp6_group_dropped(i);
2308 ma_put(i);
2309
2310 write_lock_bh(&idev->lock);
2311 }
2312 write_unlock_bh(&idev->lock);
2313}
2314
2315#ifdef CONFIG_PROC_FS
2316struct igmp6_mc_iter_state {
2317 struct net_device *dev;
2318 struct inet6_dev *idev;
2319};
2320
2321#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2322
2323static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2324{
2325 struct ifmcaddr6 *im = NULL;
2326 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2327
2328 for (state->dev = dev_base, state->idev = NULL;
2329 state->dev;
2330 state->dev = state->dev->next) {
2331 struct inet6_dev *idev;
2332 idev = in6_dev_get(state->dev);
2333 if (!idev)
2334 continue;
2335 read_lock_bh(&idev->lock);
2336 im = idev->mc_list;
2337 if (im) {
2338 state->idev = idev;
2339 break;
2340 }
2341 read_unlock_bh(&idev->lock);
2342 in6_dev_put(idev);
2343 }
2344 return im;
2345}
2346
2347static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2348{
2349 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2350
2351 im = im->next;
2352 while (!im) {
2353 if (likely(state->idev != NULL)) {
2354 read_unlock_bh(&state->idev->lock);
2355 in6_dev_put(state->idev);
2356 }
2357 state->dev = state->dev->next;
2358 if (!state->dev) {
2359 state->idev = NULL;
2360 break;
2361 }
2362 state->idev = in6_dev_get(state->dev);
2363 if (!state->idev)
2364 continue;
2365 read_lock_bh(&state->idev->lock);
2366 im = state->idev->mc_list;
2367 }
2368 return im;
2369}
2370
2371static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2372{
2373 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2374 if (im)
2375 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2376 --pos;
2377 return pos ? NULL : im;
2378}
2379
2380static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2381{
2382 read_lock(&dev_base_lock);
2383 return igmp6_mc_get_idx(seq, *pos);
2384}
2385
2386static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2387{
2388 struct ifmcaddr6 *im;
2389 im = igmp6_mc_get_next(seq, v);
2390 ++*pos;
2391 return im;
2392}
2393
2394static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2395{
2396 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2397 if (likely(state->idev != NULL)) {
2398 read_unlock_bh(&state->idev->lock);
2399 in6_dev_put(state->idev);
2400 state->idev = NULL;
2401 }
2402 state->dev = NULL;
2403 read_unlock(&dev_base_lock);
2404}
2405
2406static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2407{
2408 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2409 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2410
2411 seq_printf(seq,
9343e79a 2412 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
1da177e4
LT		 2413 state->dev->ifindex, state->dev->name,
2414 NIP6(im->mca_addr),
2415 im->mca_users, im->mca_flags,
2416 (im->mca_flags&MAF_TIMER_RUNNING) ?
2417 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2418 return 0;
2419}
2420
2421static struct seq_operations igmp6_mc_seq_ops = {
2422 .start = igmp6_mc_seq_start,
2423 .next = igmp6_mc_seq_next,
2424 .stop = igmp6_mc_seq_stop,
2425 .show = igmp6_mc_seq_show,
2426};
2427
2428static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2429{
2430 struct seq_file *seq;
2431 int rc = -ENOMEM;
0c600eda 2432 struct igmp6_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2433
2434 if (!s)
2435 goto out;
2436
2437 rc = seq_open(file, &igmp6_mc_seq_ops);
2438 if (rc)
2439 goto out_kfree;
2440
2441 seq = file->private_data;
2442 seq->private = s;
1da177e4
LT		 2443out:
2444 return rc;
2445out_kfree:
2446 kfree(s);
2447 goto out;
2448}
2449
2450static struct file_operations igmp6_mc_seq_fops = {
2451 .owner = THIS_MODULE,
2452 .open = igmp6_mc_seq_open,
2453 .read = seq_read,
2454 .llseek = seq_lseek,
2455 .release = seq_release_private,
2456};
2457
2458struct igmp6_mcf_iter_state {
2459 struct net_device *dev;
2460 struct inet6_dev *idev;
2461 struct ifmcaddr6 *im;
2462};
2463
2464#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2465
2466static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2467{
2468 struct ip6_sf_list *psf = NULL;
2469 struct ifmcaddr6 *im = NULL;
2470 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2471
2472 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2473 state->dev;
2474 state->dev = state->dev->next) {
2475 struct inet6_dev *idev;
2476 idev = in6_dev_get(state->dev);
2477 if (unlikely(idev == NULL))
2478 continue;
2479 read_lock_bh(&idev->lock);
2480 im = idev->mc_list;
2481 if (likely(im != NULL)) {
2482 spin_lock_bh(&im->mca_lock);
2483 psf = im->mca_sources;
2484 if (likely(psf != NULL)) {
2485 state->im = im;
2486 state->idev = idev;
2487 break;
2488 }
2489 spin_unlock_bh(&im->mca_lock);
2490 }
2491 read_unlock_bh(&idev->lock);
2492 in6_dev_put(idev);
2493 }
2494 return psf;
2495}
2496
2497static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2498{
2499 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2500
2501 psf = psf->sf_next;
2502 while (!psf) {
2503 spin_unlock_bh(&state->im->mca_lock);
2504 state->im = state->im->next;
2505 while (!state->im) {
2506 if (likely(state->idev != NULL)) {
2507 read_unlock_bh(&state->idev->lock);
2508 in6_dev_put(state->idev);
2509 }
2510 state->dev = state->dev->next;
2511 if (!state->dev) {
2512 state->idev = NULL;
2513 goto out;
2514 }
2515 state->idev = in6_dev_get(state->dev);
2516 if (!state->idev)
2517 continue;
2518 read_lock_bh(&state->idev->lock);
2519 state->im = state->idev->mc_list;
2520 }
2521 if (!state->im)
2522 break;
2523 spin_lock_bh(&state->im->mca_lock);
2524 psf = state->im->mca_sources;
2525 }
2526out:
2527 return psf;
2528}
2529
2530static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2531{
2532 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2533 if (psf)
2534 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2535 --pos;
2536 return pos ? NULL : psf;
2537}
2538
2539static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2540{
2541 read_lock(&dev_base_lock);
2542 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2543}
2544
2545static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2546{
2547 struct ip6_sf_list *psf;
2548 if (v == SEQ_START_TOKEN)
2549 psf = igmp6_mcf_get_first(seq);
2550 else
2551 psf = igmp6_mcf_get_next(seq, v);
2552 ++*pos;
2553 return psf;
2554}
2555
2556static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2557{
2558 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2559 if (likely(state->im != NULL)) {
2560 spin_unlock_bh(&state->im->mca_lock);
2561 state->im = NULL;
2562 }
2563 if (likely(state->idev != NULL)) {
2564 read_unlock_bh(&state->idev->lock);
2565 in6_dev_put(state->idev);
2566 state->idev = NULL;
2567 }
2568 state->dev = NULL;
2569 read_unlock(&dev_base_lock);
2570}
2571
2572static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2573{
2574 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2575 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2576
2577 if (v == SEQ_START_TOKEN) {
2578 seq_printf(seq,
2579 "%3s %6s "
9343e79a 2580 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2581 "Device", "Multicast Address",
2582 "Source Address", "INC", "EXC");
2583 } else {
2584 seq_printf(seq,
9343e79a 2585 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
1da177e4
LT		 2586 state->dev->ifindex, state->dev->name,
2587 NIP6(state->im->mca_addr),
2588 NIP6(psf->sf_addr),
2589 psf->sf_count[MCAST_INCLUDE],
2590 psf->sf_count[MCAST_EXCLUDE]);
2591 }
2592 return 0;
2593}
2594
2595static struct seq_operations igmp6_mcf_seq_ops = {
2596 .start = igmp6_mcf_seq_start,
2597 .next = igmp6_mcf_seq_next,
2598 .stop = igmp6_mcf_seq_stop,
2599 .show = igmp6_mcf_seq_show,
2600};
2601
2602static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2603{
2604 struct seq_file *seq;
2605 int rc = -ENOMEM;
0c600eda 2606 struct igmp6_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
1da177e4
LT		 2607
2608 if (!s)
2609 goto out;
2610
2611 rc = seq_open(file, &igmp6_mcf_seq_ops);
2612 if (rc)
2613 goto out_kfree;
2614
2615 seq = file->private_data;
2616 seq->private = s;
1da177e4
LT		 2617out:
2618 return rc;
2619out_kfree:
2620 kfree(s);
2621 goto out;
2622}
2623
2624static struct file_operations igmp6_mcf_seq_fops = {
2625 .owner = THIS_MODULE,
2626 .open = igmp6_mcf_seq_open,
2627 .read = seq_read,
2628 .llseek = seq_lseek,
2629 .release = seq_release_private,
2630};
2631#endif
2632
2633int __init igmp6_init(struct net_proto_family *ops)
2634{
2635 struct ipv6_pinfo *np;
2636 struct sock *sk;
2637 int err;
2638
2639 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2640 if (err < 0) {
2641 printk(KERN_ERR
2642 "Failed to initialize the IGMP6 control socket (err %d).\n",
2643 err);
2644 igmp6_socket = NULL; /* For safety. */
2645 return err;
2646 }
2647
2648 sk = igmp6_socket->sk;
2649 sk->sk_allocation = GFP_ATOMIC;
2650 sk->sk_prot->unhash(sk);
2651
2652 np = inet6_sk(sk);
2653 np->hop_limit = 1;
2654
2655#ifdef CONFIG_PROC_FS
2656 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2657 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2658#endif
2659
2660 return 0;
2661}
2662
2663void igmp6_cleanup(void)
2664{
2665 sock_release(igmp6_socket);
2666 igmp6_socket = NULL; /* for safety */
2667
2668#ifdef CONFIG_PROC_FS
2669 proc_net_remove("mcfilter6");
2670 proc_net_remove("igmp6");
2671#endif
2672}
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