]> bbs.cooldavid.org Git - net-next-2.6.git/blame - net/ipv6/mcast.c
git://bbs.cooldavid.org / net-next-2.6.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[PATCH] __user annotations of video_spu_palette
[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
31#include <linux/config.h>
32#include <linux/module.h>
33#include <linux/errno.h>
34#include <linux/types.h>
35#include <linux/string.h>
36#include <linux/socket.h>
37#include <linux/sockios.h>
38#include <linux/jiffies.h>
39#include <linux/times.h>
40#include <linux/net.h>
41#include <linux/in.h>
42#include <linux/in6.h>
43#include <linux/netdevice.h>
44#include <linux/if_arp.h>
45#include <linux/route.h>
46#include <linux/init.h>
47#include <linux/proc_fs.h>
48#include <linux/seq_file.h>
49
50#include <linux/netfilter.h>
51#include <linux/netfilter_ipv6.h>
52
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;
87 __u16 grec_nsrcs;
88 struct in6_addr grec_mca;
89 struct in6_addr grec_src[0];
90};
91
92struct mld2_report {
93 __u8 type;
94 __u8 resv1;
95 __u16 csum;
96 __u16 resv2;
97 __u16 ngrec;
98 struct mld2_grec grec[0];
99};
100
101struct mld2_query {
102 __u8 type;
103 __u8 code;
104 __u16 csum;
105 __u16 mrc;
106 __u16 resv1;
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;
120 __u16 nsrcs;
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
129static struct socket *igmp6_socket;
130
131int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
132
133static void igmp6_join_group(struct ifmcaddr6 *ma);
134static void igmp6_leave_group(struct ifmcaddr6 *ma);
135static void igmp6_timer_handler(unsigned long data);
136
137static void mld_gq_timer_expire(unsigned long data);
138static void mld_ifc_timer_expire(unsigned long data);
139static void mld_ifc_event(struct inet6_dev *idev);
140static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
141static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
142static void mld_clear_delrec(struct inet6_dev *idev);
143static int sf_setstate(struct ifmcaddr6 *pmc);
144static void sf_markstate(struct ifmcaddr6 *pmc);
145static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
146static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
147 int sfmode, int sfcount, struct in6_addr *psfsrc,
148 int delta);
149static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
150 int sfmode, int sfcount, struct in6_addr *psfsrc,
151 int delta);
152static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
153 struct inet6_dev *idev);
154
155
156#define IGMP6_UNSOLICITED_IVAL (10*HZ)
157#define MLD_QRV_DEFAULT 2
158
159#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
160 (idev)->cnf.force_mld_version == 1 || \
161 ((idev)->mc_v1_seen && \
162 time_before(jiffies, (idev)->mc_v1_seen)))
163
164#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
165#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
166 ((value) < (thresh) ? (value) : \
f12baeab 167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
1da177e4
LT		 168 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
169
170#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
171#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
172
6f4353d8 173#define IPV6_MLD_MAX_MSF 64
1da177e4
LT		 174
175int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF;
176
177/*
178 * socket join on multicast group
179 */
180
181int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
182{
183 struct net_device *dev = NULL;
184 struct ipv6_mc_socklist *mc_lst;
185 struct ipv6_pinfo *np = inet6_sk(sk);
186 int err;
187
188 if (!ipv6_addr_is_multicast(addr))
189 return -EINVAL;
190
c9e3e8b6
DS		 191 read_lock_bh(&ipv6_sk_mc_lock);
192 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
193 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
194 ipv6_addr_equal(&mc_lst->addr, addr)) {
195 read_unlock_bh(&ipv6_sk_mc_lock);
196 return -EADDRINUSE;
197 }
198 }
199 read_unlock_bh(&ipv6_sk_mc_lock);
200
1da177e4
LT		 201 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
202
203 if (mc_lst == NULL)
204 return -ENOMEM;
205
206 mc_lst->next = NULL;
207 ipv6_addr_copy(&mc_lst->addr, addr);
208
209 if (ifindex == 0) {
210 struct rt6_info *rt;
211 rt = rt6_lookup(addr, NULL, 0, 0);
212 if (rt) {
213 dev = rt->rt6i_dev;
214 dev_hold(dev);
215 dst_release(&rt->u.dst);
216 }
217 } else
218 dev = dev_get_by_index(ifindex);
219
220 if (dev == NULL) {
221 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
222 return -ENODEV;
223 }
224
225 mc_lst->ifindex = dev->ifindex;
226 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 227 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 228 mc_lst->sflist = NULL;
229
230 /*
231 * now add/increase the group membership on the device
232 */
233
234 err = ipv6_dev_mc_inc(dev, addr);
235
236 if (err) {
237 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
238 dev_put(dev);
239 return err;
240 }
241
242 write_lock_bh(&ipv6_sk_mc_lock);
243 mc_lst->next = np->ipv6_mc_list;
244 np->ipv6_mc_list = mc_lst;
245 write_unlock_bh(&ipv6_sk_mc_lock);
246
247 dev_put(dev);
248
249 return 0;
250}
251
252/*
253 * socket leave on multicast group
254 */
255int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
256{
257 struct ipv6_pinfo *np = inet6_sk(sk);
258 struct ipv6_mc_socklist *mc_lst, **lnk;
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
269 if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
270 struct inet6_dev *idev = in6_dev_get(dev);
271
272 if (idev) {
273 (void) ip6_mc_leave_src(sk,mc_lst,idev);
274 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
275 in6_dev_put(idev);
276 }
277 dev_put(dev);
278 }
279 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
280 return 0;
281 }
282 }
283 write_unlock_bh(&ipv6_sk_mc_lock);
284
9951f036 285 return -EADDRNOTAVAIL;
1da177e4
LT		 286}
287
288static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
289{
290 struct net_device *dev = NULL;
291 struct inet6_dev *idev = NULL;
292
293 if (ifindex == 0) {
294 struct rt6_info *rt;
295
296 rt = rt6_lookup(group, NULL, 0, 0);
297 if (rt) {
298 dev = rt->rt6i_dev;
299 dev_hold(dev);
300 dst_release(&rt->u.dst);
301 }
302 } else
303 dev = dev_get_by_index(ifindex);
304
305 if (!dev)
306 return NULL;
307 idev = in6_dev_get(dev);
308 if (!idev) {
309 dev_put(dev);
310 return NULL;
311 }
312 read_lock_bh(&idev->lock);
313 if (idev->dead) {
314 read_unlock_bh(&idev->lock);
315 in6_dev_put(idev);
316 dev_put(dev);
317 return NULL;
318 }
319 return idev;
320}
321
322void ipv6_sock_mc_close(struct sock *sk)
323{
324 struct ipv6_pinfo *np = inet6_sk(sk);
325 struct ipv6_mc_socklist *mc_lst;
326
327 write_lock_bh(&ipv6_sk_mc_lock);
328 while ((mc_lst = np->ipv6_mc_list) != NULL) {
329 struct net_device *dev;
330
331 np->ipv6_mc_list = mc_lst->next;
332 write_unlock_bh(&ipv6_sk_mc_lock);
333
334 dev = dev_get_by_index(mc_lst->ifindex);
335 if (dev) {
336 struct inet6_dev *idev = in6_dev_get(dev);
337
338 if (idev) {
339 (void) ip6_mc_leave_src(sk, mc_lst, idev);
340 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
341 in6_dev_put(idev);
342 }
343 dev_put(dev);
344 }
345
346 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
347
348 write_lock_bh(&ipv6_sk_mc_lock);
349 }
350 write_unlock_bh(&ipv6_sk_mc_lock);
351}
352
353int ip6_mc_source(int add, int omode, struct sock *sk,
354 struct group_source_req *pgsr)
355{
356 struct in6_addr *source, *group;
357 struct ipv6_mc_socklist *pmc;
358 struct net_device *dev;
359 struct inet6_dev *idev;
360 struct ipv6_pinfo *inet6 = inet6_sk(sk);
361 struct ip6_sf_socklist *psl;
362 int i, j, rv;
c9e3e8b6 363 int leavegroup = 0;
5ab4a6c8 364 int pmclocked = 0;
1da177e4
LT		 365 int err;
366
367 if (pgsr->gsr_group.ss_family != AF_INET6 ||
368 pgsr->gsr_source.ss_family != AF_INET6)
369 return -EINVAL;
370
371 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
372 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
373
374 if (!ipv6_addr_is_multicast(group))
375 return -EINVAL;
376
377 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
378 if (!idev)
379 return -ENODEV;
380 dev = idev->dev;
381
382 err = -EADDRNOTAVAIL;
383
c9e3e8b6 384 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 385 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
386 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
387 continue;
388 if (ipv6_addr_equal(&pmc->addr, group))
389 break;
390 }
917f2f10
DS		 391 if (!pmc) { /* must have a prior join */
392 err = -EINVAL;
1da177e4 393 goto done;
917f2f10 394 }
1da177e4
LT		 395 /* if a source filter was set, must be the same mode as before */
396 if (pmc->sflist) {
917f2f10
DS		 397 if (pmc->sfmode != omode) {
398 err = -EINVAL;
1da177e4 399 goto done;
917f2f10 400 }
1da177e4
LT		 401 } else if (pmc->sfmode != omode) {
402 /* allow mode switches for empty-set filters */
403 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
404 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
405 pmc->sfmode = omode;
406 }
407
5ab4a6c8
DS		 408 write_lock_bh(&pmc->sflock);
409 pmclocked = 1;
410
1da177e4
LT		 411 psl = pmc->sflist;
412 if (!add) {
413 if (!psl)
917f2f10 414 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 415 rv = !0;
416 for (i=0; i<psl->sl_count; i++) {
417 rv = memcmp(&psl->sl_addr[i], source,
418 sizeof(struct in6_addr));
419 if (rv == 0)
420 break;
421 }
422 if (rv) /* source not found */
917f2f10 423 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 424
c9e3e8b6
DS		 425 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
426 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
427 leavegroup = 1;
428 goto done;
429 }
430
1da177e4
LT		 431 /* update the interface filter */
432 ip6_mc_del_src(idev, group, omode, 1, source, 1);
433
434 for (j=i+1; j<psl->sl_count; j++)
435 psl->sl_addr[j-1] = psl->sl_addr[j];
436 psl->sl_count--;
437 err = 0;
438 goto done;
439 }
440 /* else, add a new source to the filter */
441
442 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
443 err = -ENOBUFS;
444 goto done;
445 }
446 if (!psl || psl->sl_count == psl->sl_max) {
447 struct ip6_sf_socklist *newpsl;
448 int count = IP6_SFBLOCK;
449
450 if (psl)
451 count += psl->sl_max;
8b3a7005 452 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 453 if (!newpsl) {
454 err = -ENOBUFS;
455 goto done;
456 }
457 newpsl->sl_max = count;
458 newpsl->sl_count = count - IP6_SFBLOCK;
459 if (psl) {
460 for (i=0; i<psl->sl_count; i++)
461 newpsl->sl_addr[i] = psl->sl_addr[i];
462 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
463 }
464 pmc->sflist = psl = newpsl;
465 }
466 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
467 for (i=0; i<psl->sl_count; i++) {
468 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
469 if (rv == 0)
470 break;
471 }
472 if (rv == 0) /* address already there is an error */
473 goto done;
474 for (j=psl->sl_count-1; j>=i; j--)
475 psl->sl_addr[j+1] = psl->sl_addr[j];
476 psl->sl_addr[i] = *source;
477 psl->sl_count++;
478 err = 0;
479 /* update the interface list */
480 ip6_mc_add_src(idev, group, omode, 1, source, 1);
481done:
5ab4a6c8
DS		 482 if (pmclocked)
483 write_unlock_bh(&pmc->sflock);
c9e3e8b6 484 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 485 read_unlock_bh(&idev->lock);
486 in6_dev_put(idev);
487 dev_put(dev);
c9e3e8b6
DS		 488 if (leavegroup)
489 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 490 return err;
491}
492
493int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
494{
495 struct in6_addr *group;
496 struct ipv6_mc_socklist *pmc;
497 struct net_device *dev;
498 struct inet6_dev *idev;
499 struct ipv6_pinfo *inet6 = inet6_sk(sk);
500 struct ip6_sf_socklist *newpsl, *psl;
9951f036 501 int leavegroup = 0;
1da177e4
LT		 502 int i, err;
503
504 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
505
506 if (!ipv6_addr_is_multicast(group))
507 return -EINVAL;
508 if (gsf->gf_fmode != MCAST_INCLUDE &&
509 gsf->gf_fmode != MCAST_EXCLUDE)
510 return -EINVAL;
511
512 idev = ip6_mc_find_dev(group, gsf->gf_interface);
513
514 if (!idev)
515 return -ENODEV;
516 dev = idev->dev;
1da177e4 517
9c05989b 518 err = 0;
5ab4a6c8
DS		 519 read_lock_bh(&ipv6_sk_mc_lock);
520
9951f036
DS		 521 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
522 leavegroup = 1;
523 goto done;
524 }
525
1da177e4
LT		 526 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
527 if (pmc->ifindex != gsf->gf_interface)
528 continue;
529 if (ipv6_addr_equal(&pmc->addr, group))
530 break;
531 }
917f2f10
DS		 532 if (!pmc) { /* must have a prior join */
533 err = -EINVAL;
1da177e4 534 goto done;
917f2f10 535 }
1da177e4 536 if (gsf->gf_numsrc) {
8b3a7005
KK		 537 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
538 GFP_ATOMIC);
1da177e4
LT		 539 if (!newpsl) {
540 err = -ENOBUFS;
541 goto done;
542 }
543 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
544 for (i=0; i<newpsl->sl_count; ++i) {
545 struct sockaddr_in6 *psin6;
546
547 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
548 newpsl->sl_addr[i] = psin6->sin6_addr;
549 }
550 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
551 newpsl->sl_count, newpsl->sl_addr, 0);
552 if (err) {
553 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
554 goto done;
555 }
8713dbf0 556 } else {
1da177e4 557 newpsl = NULL;
8713dbf0
YZ		 558 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
559 }
5ab4a6c8
DS		 560
561 write_lock_bh(&pmc->sflock);
1da177e4
LT		 562 psl = pmc->sflist;
563 if (psl) {
564 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
565 psl->sl_count, psl->sl_addr, 0);
566 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
567 } else
568 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
569 pmc->sflist = newpsl;
570 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 571 write_unlock_bh(&pmc->sflock);
917f2f10 572 err = 0;
1da177e4 573done:
5ab4a6c8 574 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 575 read_unlock_bh(&idev->lock);
576 in6_dev_put(idev);
577 dev_put(dev);
9951f036
DS		 578 if (leavegroup)
579 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 580 return err;
581}
582
583int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
584 struct group_filter __user *optval, int __user *optlen)
585{
586 int err, i, count, copycount;
587 struct in6_addr *group;
588 struct ipv6_mc_socklist *pmc;
589 struct inet6_dev *idev;
590 struct net_device *dev;
591 struct ipv6_pinfo *inet6 = inet6_sk(sk);
592 struct ip6_sf_socklist *psl;
593
594 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
595
596 if (!ipv6_addr_is_multicast(group))
597 return -EINVAL;
598
599 idev = ip6_mc_find_dev(group, gsf->gf_interface);
600
601 if (!idev)
602 return -ENODEV;
603
604 dev = idev->dev;
605
606 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 607 /*
608 * changes to the ipv6_mc_list require the socket lock and
609 * a read lock on ip6_sk_mc_lock. We have the socket lock,
610 * so reading the list is safe.
611 */
1da177e4
LT		 612
613 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
614 if (pmc->ifindex != gsf->gf_interface)
615 continue;
616 if (ipv6_addr_equal(group, &pmc->addr))
617 break;
618 }
619 if (!pmc) /* must have a prior join */
620 goto done;
621 gsf->gf_fmode = pmc->sfmode;
622 psl = pmc->sflist;
623 count = psl ? psl->sl_count : 0;
624 read_unlock_bh(&idev->lock);
625 in6_dev_put(idev);
626 dev_put(dev);
627
628 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
629 gsf->gf_numsrc = count;
630 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
631 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
632 return -EFAULT;
633 }
5ab4a6c8
DS		 634 /* changes to psl require the socket lock, a read lock on
635 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
636 * have the socket lock, so reading here is safe.
637 */
1da177e4
LT		 638 for (i=0; i<copycount; i++) {
639 struct sockaddr_in6 *psin6;
640 struct sockaddr_storage ss;
641
642 psin6 = (struct sockaddr_in6 *)&ss;
643 memset(&ss, 0, sizeof(ss));
644 psin6->sin6_family = AF_INET6;
645 psin6->sin6_addr = psl->sl_addr[i];
646 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
647 return -EFAULT;
648 }
649 return 0;
650done:
651 read_unlock_bh(&idev->lock);
652 in6_dev_put(idev);
653 dev_put(dev);
654 return err;
655}
656
657int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
658 struct in6_addr *src_addr)
659{
660 struct ipv6_pinfo *np = inet6_sk(sk);
661 struct ipv6_mc_socklist *mc;
662 struct ip6_sf_socklist *psl;
663 int rv = 1;
664
665 read_lock(&ipv6_sk_mc_lock);
666 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
667 if (ipv6_addr_equal(&mc->addr, mc_addr))
668 break;
669 }
670 if (!mc) {
671 read_unlock(&ipv6_sk_mc_lock);
672 return 1;
673 }
5ab4a6c8 674 read_lock(&mc->sflock);
1da177e4
LT		 675 psl = mc->sflist;
676 if (!psl) {
677 rv = mc->sfmode == MCAST_EXCLUDE;
678 } else {
679 int i;
680
681 for (i=0; i<psl->sl_count; i++) {
682 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
683 break;
684 }
685 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
686 rv = 0;
687 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
688 rv = 0;
689 }
5ab4a6c8 690 read_unlock(&mc->sflock);
1da177e4
LT		 691 read_unlock(&ipv6_sk_mc_lock);
692
693 return rv;
694}
695
696static void ma_put(struct ifmcaddr6 *mc)
697{
698 if (atomic_dec_and_test(&mc->mca_refcnt)) {
699 in6_dev_put(mc->idev);
700 kfree(mc);
701 }
702}
703
704static void igmp6_group_added(struct ifmcaddr6 *mc)
705{
706 struct net_device *dev = mc->idev->dev;
707 char buf[MAX_ADDR_LEN];
708
709 spin_lock_bh(&mc->mca_lock);
710 if (!(mc->mca_flags&MAF_LOADED)) {
711 mc->mca_flags |= MAF_LOADED;
712 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
713 dev_mc_add(dev, buf, dev->addr_len, 0);
714 }
715 spin_unlock_bh(&mc->mca_lock);
716
717 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
718 return;
719
720 if (MLD_V1_SEEN(mc->idev)) {
721 igmp6_join_group(mc);
722 return;
723 }
724 /* else v2 */
725
726 mc->mca_crcount = mc->idev->mc_qrv;
727 mld_ifc_event(mc->idev);
728}
729
730static void igmp6_group_dropped(struct ifmcaddr6 *mc)
731{
732 struct net_device *dev = mc->idev->dev;
733 char buf[MAX_ADDR_LEN];
734
735 spin_lock_bh(&mc->mca_lock);
736 if (mc->mca_flags&MAF_LOADED) {
737 mc->mca_flags &= ~MAF_LOADED;
738 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
739 dev_mc_delete(dev, buf, dev->addr_len, 0);
740 }
741
742 if (mc->mca_flags & MAF_NOREPORT)
743 goto done;
744 spin_unlock_bh(&mc->mca_lock);
745
746 if (!mc->idev->dead)
747 igmp6_leave_group(mc);
748
749 spin_lock_bh(&mc->mca_lock);
750 if (del_timer(&mc->mca_timer))
751 atomic_dec(&mc->mca_refcnt);
752done:
753 ip6_mc_clear_src(mc);
754 spin_unlock_bh(&mc->mca_lock);
755}
756
757/*
758 * deleted ifmcaddr6 manipulation
759 */
760static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
761{
762 struct ifmcaddr6 *pmc;
763
764 /* this is an "ifmcaddr6" for convenience; only the fields below
765 * are actually used. In particular, the refcnt and users are not
766 * used for management of the delete list. Using the same structure
767 * for deleted items allows change reports to use common code with
768 * non-deleted or query-response MCA's.
769 */
8b3a7005 770 pmc = kmalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 771 if (!pmc)
772 return;
773 memset(pmc, 0, sizeof(*pmc));
774 spin_lock_bh(&im->mca_lock);
775 spin_lock_init(&pmc->mca_lock);
776 pmc->idev = im->idev;
777 in6_dev_hold(idev);
778 pmc->mca_addr = im->mca_addr;
779 pmc->mca_crcount = idev->mc_qrv;
780 pmc->mca_sfmode = im->mca_sfmode;
781 if (pmc->mca_sfmode == MCAST_INCLUDE) {
782 struct ip6_sf_list *psf;
783
784 pmc->mca_tomb = im->mca_tomb;
785 pmc->mca_sources = im->mca_sources;
786 im->mca_tomb = im->mca_sources = NULL;
787 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
788 psf->sf_crcount = pmc->mca_crcount;
789 }
790 spin_unlock_bh(&im->mca_lock);
791
792 write_lock_bh(&idev->mc_lock);
793 pmc->next = idev->mc_tomb;
794 idev->mc_tomb = pmc;
795 write_unlock_bh(&idev->mc_lock);
796}
797
798static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
799{
800 struct ifmcaddr6 *pmc, *pmc_prev;
801 struct ip6_sf_list *psf, *psf_next;
802
803 write_lock_bh(&idev->mc_lock);
804 pmc_prev = NULL;
805 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
806 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
807 break;
808 pmc_prev = pmc;
809 }
810 if (pmc) {
811 if (pmc_prev)
812 pmc_prev->next = pmc->next;
813 else
814 idev->mc_tomb = pmc->next;
815 }
816 write_unlock_bh(&idev->mc_lock);
817 if (pmc) {
818 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
819 psf_next = psf->sf_next;
820 kfree(psf);
821 }
822 in6_dev_put(pmc->idev);
823 kfree(pmc);
824 }
825}
826
827static void mld_clear_delrec(struct inet6_dev *idev)
828{
829 struct ifmcaddr6 *pmc, *nextpmc;
830
831 write_lock_bh(&idev->mc_lock);
832 pmc = idev->mc_tomb;
833 idev->mc_tomb = NULL;
834 write_unlock_bh(&idev->mc_lock);
835
836 for (; pmc; pmc = nextpmc) {
837 nextpmc = pmc->next;
838 ip6_mc_clear_src(pmc);
839 in6_dev_put(pmc->idev);
840 kfree(pmc);
841 }
842
843 /* clear dead sources, too */
844 read_lock_bh(&idev->lock);
845 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
846 struct ip6_sf_list *psf, *psf_next;
847
848 spin_lock_bh(&pmc->mca_lock);
849 psf = pmc->mca_tomb;
850 pmc->mca_tomb = NULL;
851 spin_unlock_bh(&pmc->mca_lock);
852 for (; psf; psf=psf_next) {
853 psf_next = psf->sf_next;
854 kfree(psf);
855 }
856 }
857 read_unlock_bh(&idev->lock);
858}
859
860
861/*
862 * device multicast group inc (add if not found)
863 */
864int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
865{
866 struct ifmcaddr6 *mc;
867 struct inet6_dev *idev;
868
869 idev = in6_dev_get(dev);
870
871 if (idev == NULL)
872 return -EINVAL;
873
874 write_lock_bh(&idev->lock);
875 if (idev->dead) {
876 write_unlock_bh(&idev->lock);
877 in6_dev_put(idev);
878 return -ENODEV;
879 }
880
881 for (mc = idev->mc_list; mc; mc = mc->next) {
882 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
883 mc->mca_users++;
884 write_unlock_bh(&idev->lock);
885 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
886 NULL, 0);
887 in6_dev_put(idev);
888 return 0;
889 }
890 }
891
892 /*
893 * not found: create a new one.
894 */
895
896 mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
897
898 if (mc == NULL) {
899 write_unlock_bh(&idev->lock);
900 in6_dev_put(idev);
901 return -ENOMEM;
902 }
903
904 memset(mc, 0, sizeof(struct ifmcaddr6));
905 init_timer(&mc->mca_timer);
906 mc->mca_timer.function = igmp6_timer_handler;
907 mc->mca_timer.data = (unsigned long) mc;
908
909 ipv6_addr_copy(&mc->mca_addr, addr);
910 mc->idev = idev;
911 mc->mca_users = 1;
912 /* mca_stamp should be updated upon changes */
913 mc->mca_cstamp = mc->mca_tstamp = jiffies;
914 atomic_set(&mc->mca_refcnt, 2);
915 spin_lock_init(&mc->mca_lock);
916
917 /* initial mode is (EX, empty) */
918 mc->mca_sfmode = MCAST_EXCLUDE;
919 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
920
921 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
922 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
923 mc->mca_flags |= MAF_NOREPORT;
924
925 mc->next = idev->mc_list;
926 idev->mc_list = mc;
927 write_unlock_bh(&idev->lock);
928
929 mld_del_delrec(idev, &mc->mca_addr);
930 igmp6_group_added(mc);
931 ma_put(mc);
932 return 0;
933}
934
935/*
936 * device multicast group del
937 */
938int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
939{
940 struct ifmcaddr6 *ma, **map;
941
942 write_lock_bh(&idev->lock);
943 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
944 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
945 if (--ma->mca_users == 0) {
946 *map = ma->next;
947 write_unlock_bh(&idev->lock);
948
949 igmp6_group_dropped(ma);
950
951 ma_put(ma);
952 return 0;
953 }
954 write_unlock_bh(&idev->lock);
955 return 0;
956 }
957 }
958 write_unlock_bh(&idev->lock);
959
960 return -ENOENT;
961}
962
963int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
964{
965 struct inet6_dev *idev = in6_dev_get(dev);
966 int err;
967
968 if (!idev)
969 return -ENODEV;
970
971 err = __ipv6_dev_mc_dec(idev, addr);
972
973 in6_dev_put(idev);
974
975 return err;
976}
977
978/*
979 * identify MLD packets for MLD filter exceptions
980 */
981int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
982{
983 struct icmp6hdr *pic;
984
985 if (nexthdr != IPPROTO_ICMPV6)
986 return 0;
987
988 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
989 return 0;
990
991 pic = (struct icmp6hdr *)skb->h.raw;
992
993 switch (pic->icmp6_type) {
994 case ICMPV6_MGM_QUERY:
995 case ICMPV6_MGM_REPORT:
996 case ICMPV6_MGM_REDUCTION:
997 case ICMPV6_MLD2_REPORT:
998 return 1;
999 default:
1000 break;
1001 }
1002 return 0;
1003}
1004
1005/*
1006 * check if the interface/address pair is valid
1007 */
1008int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1009 struct in6_addr *src_addr)
1010{
1011 struct inet6_dev *idev;
1012 struct ifmcaddr6 *mc;
1013 int rv = 0;
1014
1015 idev = in6_dev_get(dev);
1016 if (idev) {
1017 read_lock_bh(&idev->lock);
1018 for (mc = idev->mc_list; mc; mc=mc->next) {
1019 if (ipv6_addr_equal(&mc->mca_addr, group))
1020 break;
1021 }
1022 if (mc) {
1023 if (src_addr && !ipv6_addr_any(src_addr)) {
1024 struct ip6_sf_list *psf;
1025
1026 spin_lock_bh(&mc->mca_lock);
1027 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1028 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1029 break;
1030 }
1031 if (psf)
1032 rv = psf->sf_count[MCAST_INCLUDE] ||
1033 psf->sf_count[MCAST_EXCLUDE] !=
1034 mc->mca_sfcount[MCAST_EXCLUDE];
1035 else
1036 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1037 spin_unlock_bh(&mc->mca_lock);
1038 } else
1039 rv = 1; /* don't filter unspecified source */
1040 }
1041 read_unlock_bh(&idev->lock);
1042 in6_dev_put(idev);
1043 }
1044 return rv;
1045}
1046
1047static void mld_gq_start_timer(struct inet6_dev *idev)
1048{
1049 int tv = net_random() % idev->mc_maxdelay;
1050
1051 idev->mc_gq_running = 1;
1052 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1053 in6_dev_hold(idev);
1054}
1055
1056static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1057{
1058 int tv = net_random() % delay;
1059
1060 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1061 in6_dev_hold(idev);
1062}
1063
1064/*
1065 * IGMP handling (alias multicast ICMPv6 messages)
1066 */
1067
1068static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1069{
1070 unsigned long delay = resptime;
1071
1072 /* Do not start timer for these addresses */
1073 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1074 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1075 return;
1076
1077 if (del_timer(&ma->mca_timer)) {
1078 atomic_dec(&ma->mca_refcnt);
1079 delay = ma->mca_timer.expires - jiffies;
1080 }
1081
1082 if (delay >= resptime) {
1083 if (resptime)
1084 delay = net_random() % resptime;
1085 else
1086 delay = 1;
1087 }
1088 ma->mca_timer.expires = jiffies + delay;
1089 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1090 atomic_inc(&ma->mca_refcnt);
1091 ma->mca_flags |= MAF_TIMER_RUNNING;
1092}
1093
5ab4a6c8
DS		 1094/* mark EXCLUDE-mode sources */
1095static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1096 struct in6_addr *srcs)
1097{
1098 struct ip6_sf_list *psf;
1099 int i, scount;
1100
1101 scount = 0;
1102 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1103 if (scount == nsrcs)
1104 break;
5ab4a6c8
DS		 1105 for (i=0; i<nsrcs; i++) {
1106 /* skip inactive filters */
1107 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1108 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1109 psf->sf_count[MCAST_EXCLUDE])
1110 continue;
1111 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1112 scount++;
1113 break;
1114 }
1115 }
1116 }
1117 pmc->mca_flags &= ~MAF_GSQUERY;
1118 if (scount == nsrcs) /* all sources excluded */
1119 return 0;
1120 return 1;
1121}
1122
1123static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1124 struct in6_addr *srcs)
1125{
1126 struct ip6_sf_list *psf;
1127 int i, scount;
1128
1129 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1130 return mld_xmarksources(pmc, nsrcs, srcs);
1131
1132 /* mark INCLUDE-mode sources */
1133
1134 scount = 0;
1135 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1136 if (scount == nsrcs)
1137 break;
1138 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1139 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1140 psf->sf_gsresp = 1;
1141 scount++;
1142 break;
1143 }
5ab4a6c8
DS		 1144 }
1145 }
1146 if (!scount) {
1147 pmc->mca_flags &= ~MAF_GSQUERY;
1148 return 0;
1da177e4 1149 }
5ab4a6c8
DS		 1150 pmc->mca_flags |= MAF_GSQUERY;
1151 return 1;
1da177e4
LT		 1152}
1153
1154int igmp6_event_query(struct sk_buff *skb)
1155{
97300b5f 1156 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1157 struct ifmcaddr6 *ma;
1158 struct in6_addr *group;
1159 unsigned long max_delay;
1160 struct inet6_dev *idev;
1161 struct icmp6hdr *hdr;
1162 int group_type;
1163 int mark = 0;
1164 int len;
1165
1166 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1167 return -EINVAL;
1168
1169 /* compute payload length excluding extension headers */
1170 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1171 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1172
1173 /* Drop queries with not link local source */
1174 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1175 return -EINVAL;
1176
1177 idev = in6_dev_get(skb->dev);
1178
1179 if (idev == NULL)
1180 return 0;
1181
1182 hdr = (struct icmp6hdr *) skb->h.raw;
1183 group = (struct in6_addr *) (hdr + 1);
1184 group_type = ipv6_addr_type(group);
1185
1186 if (group_type != IPV6_ADDR_ANY &&
1187 !(group_type&IPV6_ADDR_MULTICAST)) {
1188 in6_dev_put(idev);
1189 return -EINVAL;
1190 }
1191
1192 if (len == 24) {
1193 int switchback;
1194 /* MLDv1 router present */
1195
1196 /* Translate milliseconds to jiffies */
1197 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1198
1199 switchback = (idev->mc_qrv + 1) * max_delay;
1200 idev->mc_v1_seen = jiffies + switchback;
1201
1202 /* cancel the interface change timer */
1203 idev->mc_ifc_count = 0;
1204 if (del_timer(&idev->mc_ifc_timer))
1205 __in6_dev_put(idev);
1206 /* clear deleted report items */
1207 mld_clear_delrec(idev);
1208 } else if (len >= 28) {
97300b5f
YZ		 1209 int srcs_offset = sizeof(struct mld2_query) -
1210 sizeof(struct icmp6hdr);
1211 if (!pskb_may_pull(skb, srcs_offset)) {
1212 in6_dev_put(idev);
1213 return -EINVAL;
1214 }
1215 mlh2 = (struct mld2_query *) skb->h.raw;
1da177e4
LT		 1216 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1217 if (!max_delay)
1218 max_delay = 1;
1219 idev->mc_maxdelay = max_delay;
1220 if (mlh2->qrv)
1221 idev->mc_qrv = mlh2->qrv;
1222 if (group_type == IPV6_ADDR_ANY) { /* general query */
1223 if (mlh2->nsrcs) {
1224 in6_dev_put(idev);
1225 return -EINVAL; /* no sources allowed */
1226 }
1227 mld_gq_start_timer(idev);
1228 in6_dev_put(idev);
1229 return 0;
1230 }
1231 /* mark sources to include, if group & source-specific */
97300b5f
YZ		 1232 if (mlh2->nsrcs != 0) {
1233 if (!pskb_may_pull(skb, srcs_offset +
5ab4a6c8 1234 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1235 in6_dev_put(idev);
1236 return -EINVAL;
1237 }
1238 mlh2 = (struct mld2_query *) skb->h.raw;
1239 mark = 1;
1240 }
1da177e4
LT		 1241 } else {
1242 in6_dev_put(idev);
1243 return -EINVAL;
1244 }
1245
1246 read_lock_bh(&idev->lock);
1247 if (group_type == IPV6_ADDR_ANY) {
1248 for (ma = idev->mc_list; ma; ma=ma->next) {
1249 spin_lock_bh(&ma->mca_lock);
1250 igmp6_group_queried(ma, max_delay);
1251 spin_unlock_bh(&ma->mca_lock);
1252 }
1253 } else {
1254 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1255 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1256 continue;
1257 spin_lock_bh(&ma->mca_lock);
1258 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1259 /* gsquery <- gsquery && mark */
1260 if (!mark)
1261 ma->mca_flags &= ~MAF_GSQUERY;
1262 } else {
1263 /* gsquery <- mark */
1264 if (mark)
1265 ma->mca_flags |= MAF_GSQUERY;
1266 else
1267 ma->mca_flags &= ~MAF_GSQUERY;
1268 }
5ab4a6c8 1269 if (!(ma->mca_flags & MAF_GSQUERY) ||
7add2a43 1270 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
5ab4a6c8 1271 igmp6_group_queried(ma, max_delay);
1da177e4 1272 spin_unlock_bh(&ma->mca_lock);
7add2a43 1273 break;
1da177e4
LT		 1274 }
1275 }
1276 read_unlock_bh(&idev->lock);
1277 in6_dev_put(idev);
1278
1279 return 0;
1280}
1281
1282
1283int igmp6_event_report(struct sk_buff *skb)
1284{
1285 struct ifmcaddr6 *ma;
1286 struct in6_addr *addrp;
1287 struct inet6_dev *idev;
1288 struct icmp6hdr *hdr;
1289 int addr_type;
1290
1291 /* Our own report looped back. Ignore it. */
1292 if (skb->pkt_type == PACKET_LOOPBACK)
1293 return 0;
1294
24c69275
DS		 1295 /* send our report if the MC router may not have heard this report */
1296 if (skb->pkt_type != PACKET_MULTICAST &&
1297 skb->pkt_type != PACKET_BROADCAST)
1298 return 0;
1299
1da177e4
LT		 1300 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1301 return -EINVAL;
1302
1303 hdr = (struct icmp6hdr*) skb->h.raw;
1304
1305 /* Drop reports with not link local source */
1306 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1307 if (addr_type != IPV6_ADDR_ANY &&
1308 !(addr_type&IPV6_ADDR_LINKLOCAL))
1309 return -EINVAL;
1310
1311 addrp = (struct in6_addr *) (hdr + 1);
1312
1313 idev = in6_dev_get(skb->dev);
1314 if (idev == NULL)
1315 return -ENODEV;
1316
1317 /*
1318 * Cancel the timer for this group
1319 */
1320
1321 read_lock_bh(&idev->lock);
1322 for (ma = idev->mc_list; ma; ma=ma->next) {
1323 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1324 spin_lock(&ma->mca_lock);
1325 if (del_timer(&ma->mca_timer))
1326 atomic_dec(&ma->mca_refcnt);
1327 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1328 spin_unlock(&ma->mca_lock);
1329 break;
1330 }
1331 }
1332 read_unlock_bh(&idev->lock);
1333 in6_dev_put(idev);
1334 return 0;
1335}
1336
1337static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1338 int gdeleted, int sdeleted)
1339{
1340 switch (type) {
1341 case MLD2_MODE_IS_INCLUDE:
1342 case MLD2_MODE_IS_EXCLUDE:
1343 if (gdeleted || sdeleted)
1344 return 0;
5ab4a6c8
DS		 1345 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1346 if (pmc->mca_sfmode == MCAST_INCLUDE)
1347 return 1;
1348 /* don't include if this source is excluded
1349 * in all filters
1350 */
1351 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1352 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1353 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1354 psf->sf_count[MCAST_EXCLUDE];
1355 }
1356 return 0;
1da177e4
LT		 1357 case MLD2_CHANGE_TO_INCLUDE:
1358 if (gdeleted || sdeleted)
1359 return 0;
1360 return psf->sf_count[MCAST_INCLUDE] != 0;
1361 case MLD2_CHANGE_TO_EXCLUDE:
1362 if (gdeleted || sdeleted)
1363 return 0;
1364 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1365 psf->sf_count[MCAST_INCLUDE])
1366 return 0;
1367 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1368 psf->sf_count[MCAST_EXCLUDE];
1369 case MLD2_ALLOW_NEW_SOURCES:
1370 if (gdeleted || !psf->sf_crcount)
1371 return 0;
1372 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1373 case MLD2_BLOCK_OLD_SOURCES:
1374 if (pmc->mca_sfmode == MCAST_INCLUDE)
1375 return gdeleted || (psf->sf_crcount && sdeleted);
1376 return psf->sf_crcount && !gdeleted && !sdeleted;
1377 }
1378 return 0;
1379}
1380
1381static int
1382mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1383{
1384 struct ip6_sf_list *psf;
1385 int scount = 0;
1386
1387 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1388 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1389 continue;
1390 scount++;
1391 }
1392 return scount;
1393}
1394
1395static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1396{
1397 struct sock *sk = igmp6_socket->sk;
1398 struct sk_buff *skb;
1399 struct mld2_report *pmr;
1400 struct in6_addr addr_buf;
1401 int err;
1402 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1403 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1404 IPV6_TLV_PADN, 0 };
1405
1406 /* we assume size > sizeof(ra) here */
1407 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1408
1409 if (skb == 0)
1410 return NULL;
1411
1412 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1413
1414 if (ipv6_get_lladdr(dev, &addr_buf)) {
1415 /* <draft-ietf-magma-mld-source-05.txt>:
1416 * use unspecified address as the source address
1417 * when a valid link-local address is not available.
1418 */
1419 memset(&addr_buf, 0, sizeof(addr_buf));
1420 }
1421
1422 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1423
1424 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1425
1426 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1427 skb->h.raw = (unsigned char *)pmr;
1428 pmr->type = ICMPV6_MLD2_REPORT;
1429 pmr->resv1 = 0;
1430 pmr->csum = 0;
1431 pmr->resv2 = 0;
1432 pmr->ngrec = 0;
1433 return skb;
1434}
1435
e9823185
PM		 1436static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1437{
1438 struct net_device *dev = skb->dev;
1439
1440 if (dev->hard_header) {
1441 unsigned char ha[MAX_ADDR_LEN];
1442 int err;
1443
1444 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1445 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1446 if (err < 0) {
1447 kfree_skb(skb);
1448 return err;
1449 }
1450 }
1451 return dev_queue_xmit(skb);
1452}
1453
1454static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1455{
1456 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1457 mld_dev_queue_xmit2);
1458}
1459
1da177e4
LT		 1460static void mld_sendpack(struct sk_buff *skb)
1461{
1462 struct ipv6hdr *pip6 = skb->nh.ipv6h;
1463 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1464 int payload_len, mldlen;
1465 struct inet6_dev *idev = in6_dev_get(skb->dev);
1466 int err;
1467
1468 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1469 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1470 sizeof(struct ipv6hdr);
1471 mldlen = skb->tail - skb->h.raw;
1472 pip6->payload_len = htons(payload_len);
1473
1474 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1475 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1476 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1477 mld_dev_queue_xmit);
1da177e4
LT		 1478 if (!err) {
1479 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1480 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1481 } else
1482 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1483
1484 if (likely(idev != NULL))
1485 in6_dev_put(idev);
1486}
1487
1488static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1489{
fab10fe3 1490 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1491}
1492
1493static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1494 int type, struct mld2_grec **ppgr)
1495{
1496 struct net_device *dev = pmc->idev->dev;
1497 struct mld2_report *pmr;
1498 struct mld2_grec *pgr;
1499
1500 if (!skb)
1501 skb = mld_newpack(dev, dev->mtu);
1502 if (!skb)
1503 return NULL;
1504 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1505 pgr->grec_type = type;
1506 pgr->grec_auxwords = 0;
1507 pgr->grec_nsrcs = 0;
1508 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1509 pmr = (struct mld2_report *)skb->h.raw;
1510 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1511 *ppgr = pgr;
1512 return skb;
1513}
1514
1515#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1516 skb_tailroom(skb)) : 0)
1517
1518static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1519 int type, int gdeleted, int sdeleted)
1520{
1521 struct net_device *dev = pmc->idev->dev;
1522 struct mld2_report *pmr;
1523 struct mld2_grec *pgr = NULL;
1524 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1525 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1526
1527 if (pmc->mca_flags & MAF_NOREPORT)
1528 return skb;
1529
1530 isquery = type == MLD2_MODE_IS_INCLUDE ||
1531 type == MLD2_MODE_IS_EXCLUDE;
1532 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1533 type == MLD2_CHANGE_TO_EXCLUDE;
1534
5ab4a6c8
DS		 1535 stotal = scount = 0;
1536
1da177e4
LT		 1537 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1538
5ab4a6c8
DS		 1539 if (!*psf_list)
1540 goto empty_source;
1541
1da177e4
LT		 1542 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1543
1544 /* EX and TO_EX get a fresh packet, if needed */
1545 if (truncate) {
1546 if (pmr && pmr->ngrec &&
1547 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1548 if (skb)
1549 mld_sendpack(skb);
1550 skb = mld_newpack(dev, dev->mtu);
1551 }
1552 }
1553 first = 1;
1da177e4
LT		 1554 psf_prev = NULL;
1555 for (psf=*psf_list; psf; psf=psf_next) {
1556 struct in6_addr *psrc;
1557
1558 psf_next = psf->sf_next;
1559
1560 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1561 psf_prev = psf;
1562 continue;
1563 }
1564
1565 /* clear marks on query responses */
1566 if (isquery)
1567 psf->sf_gsresp = 0;
1568
1569 if (AVAILABLE(skb) < sizeof(*psrc) +
1570 first*sizeof(struct mld2_grec)) {
1571 if (truncate && !first)
1572 break; /* truncate these */
1573 if (pgr)
1574 pgr->grec_nsrcs = htons(scount);
1575 if (skb)
1576 mld_sendpack(skb);
1577 skb = mld_newpack(dev, dev->mtu);
1578 first = 1;
1579 scount = 0;
1580 }
1581 if (first) {
1582 skb = add_grhead(skb, pmc, type, &pgr);
1583 first = 0;
1584 }
1585 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1586 *psrc = psf->sf_addr;
5ab4a6c8 1587 scount++; stotal++;
1da177e4
LT		 1588 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1589 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1590 psf->sf_crcount--;
1591 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1592 if (psf_prev)
1593 psf_prev->sf_next = psf->sf_next;
1594 else
1595 *psf_list = psf->sf_next;
1596 kfree(psf);
1597 continue;
1598 }
1599 }
1600 psf_prev = psf;
1601 }
5ab4a6c8
DS		 1602
1603empty_source:
1604 if (!stotal) {
1605 if (type == MLD2_ALLOW_NEW_SOURCES ||
1606 type == MLD2_BLOCK_OLD_SOURCES)
1607 return skb;
1608 if (pmc->mca_crcount || isquery) {
1609 /* make sure we have room for group header */
1610 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1611 mld_sendpack(skb);
1612 skb = NULL; /* add_grhead will get a new one */
1613 }
1614 skb = add_grhead(skb, pmc, type, &pgr);
1615 }
1616 }
1da177e4
LT		 1617 if (pgr)
1618 pgr->grec_nsrcs = htons(scount);
1619
1620 if (isquery)
1621 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1622 return skb;
1623}
1624
1625static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1626{
1627 struct sk_buff *skb = NULL;
1628 int type;
1629
1630 if (!pmc) {
1631 read_lock_bh(&idev->lock);
1632 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1633 if (pmc->mca_flags & MAF_NOREPORT)
1634 continue;
1635 spin_lock_bh(&pmc->mca_lock);
1636 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1637 type = MLD2_MODE_IS_EXCLUDE;
1638 else
1639 type = MLD2_MODE_IS_INCLUDE;
1640 skb = add_grec(skb, pmc, type, 0, 0);
1641 spin_unlock_bh(&pmc->mca_lock);
1642 }
1643 read_unlock_bh(&idev->lock);
1644 } else {
1645 spin_lock_bh(&pmc->mca_lock);
1646 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1647 type = MLD2_MODE_IS_EXCLUDE;
1648 else
1649 type = MLD2_MODE_IS_INCLUDE;
1650 skb = add_grec(skb, pmc, type, 0, 0);
1651 spin_unlock_bh(&pmc->mca_lock);
1652 }
1653 if (skb)
1654 mld_sendpack(skb);
1655}
1656
1657/*
1658 * remove zero-count source records from a source filter list
1659 */
1660static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1661{
1662 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1663
1664 psf_prev = NULL;
1665 for (psf=*ppsf; psf; psf = psf_next) {
1666 psf_next = psf->sf_next;
1667 if (psf->sf_crcount == 0) {
1668 if (psf_prev)
1669 psf_prev->sf_next = psf->sf_next;
1670 else
1671 *ppsf = psf->sf_next;
1672 kfree(psf);
1673 } else
1674 psf_prev = psf;
1675 }
1676}
1677
1678static void mld_send_cr(struct inet6_dev *idev)
1679{
1680 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1681 struct sk_buff *skb = NULL;
1682 int type, dtype;
1683
1684 read_lock_bh(&idev->lock);
1685 write_lock_bh(&idev->mc_lock);
1686
1687 /* deleted MCA's */
1688 pmc_prev = NULL;
1689 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1690 pmc_next = pmc->next;
1691 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1692 type = MLD2_BLOCK_OLD_SOURCES;
1693 dtype = MLD2_BLOCK_OLD_SOURCES;
1694 skb = add_grec(skb, pmc, type, 1, 0);
1695 skb = add_grec(skb, pmc, dtype, 1, 1);
1696 }
1697 if (pmc->mca_crcount) {
1da177e4
LT		 1698 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1699 type = MLD2_CHANGE_TO_INCLUDE;
1700 skb = add_grec(skb, pmc, type, 1, 0);
1701 }
5ab4a6c8 1702 pmc->mca_crcount--;
1da177e4
LT		 1703 if (pmc->mca_crcount == 0) {
1704 mld_clear_zeros(&pmc->mca_tomb);
1705 mld_clear_zeros(&pmc->mca_sources);
1706 }
1707 }
1708 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1709 !pmc->mca_sources) {
1710 if (pmc_prev)
1711 pmc_prev->next = pmc_next;
1712 else
1713 idev->mc_tomb = pmc_next;
1714 in6_dev_put(pmc->idev);
1715 kfree(pmc);
1716 } else
1717 pmc_prev = pmc;
1718 }
1719 write_unlock_bh(&idev->mc_lock);
1720
1721 /* change recs */
1722 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1723 spin_lock_bh(&pmc->mca_lock);
1724 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1725 type = MLD2_BLOCK_OLD_SOURCES;
1726 dtype = MLD2_ALLOW_NEW_SOURCES;
1727 } else {
1728 type = MLD2_ALLOW_NEW_SOURCES;
1729 dtype = MLD2_BLOCK_OLD_SOURCES;
1730 }
1731 skb = add_grec(skb, pmc, type, 0, 0);
1732 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1733
1734 /* filter mode changes */
1735 if (pmc->mca_crcount) {
1da177e4
LT		 1736 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1737 type = MLD2_CHANGE_TO_EXCLUDE;
1738 else
1739 type = MLD2_CHANGE_TO_INCLUDE;
1740 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1741 pmc->mca_crcount--;
1da177e4
LT		 1742 }
1743 spin_unlock_bh(&pmc->mca_lock);
1744 }
1745 read_unlock_bh(&idev->lock);
1746 if (!skb)
1747 return;
1748 (void) mld_sendpack(skb);
1749}
1750
1751static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1752{
1753 struct sock *sk = igmp6_socket->sk;
1754 struct inet6_dev *idev;
1755 struct sk_buff *skb;
1756 struct icmp6hdr *hdr;
1757 struct in6_addr *snd_addr;
1758 struct in6_addr *addrp;
1759 struct in6_addr addr_buf;
1760 struct in6_addr all_routers;
1761 int err, len, payload_len, full_len;
1762 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1763 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1764 IPV6_TLV_PADN, 0 };
1765
1766 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1767 snd_addr = addr;
1768 if (type == ICMPV6_MGM_REDUCTION) {
1769 snd_addr = &all_routers;
1770 ipv6_addr_all_routers(&all_routers);
1771 }
1772
1773 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1774 payload_len = len + sizeof(ra);
1775 full_len = sizeof(struct ipv6hdr) + payload_len;
1776
1777 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1778
1779 if (skb == NULL) {
1780 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1781 return;
1782 }
1783
1784 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1785
1786 if (ipv6_get_lladdr(dev, &addr_buf)) {
1787 /* <draft-ietf-magma-mld-source-05.txt>:
1788 * use unspecified address as the source address
1789 * when a valid link-local address is not available.
1790 */
1791 memset(&addr_buf, 0, sizeof(addr_buf));
1792 }
1793
1794 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1795
1796 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1797
1798 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1799 memset(hdr, 0, sizeof(struct icmp6hdr));
1800 hdr->icmp6_type = type;
1801
1802 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1803 ipv6_addr_copy(addrp, addr);
1804
1805 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1806 IPPROTO_ICMPV6,
1807 csum_partial((__u8 *) hdr, len, 0));
1808
1809 idev = in6_dev_get(skb->dev);
1810
1811 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1812 mld_dev_queue_xmit);
1da177e4
LT		 1813 if (!err) {
1814 if (type == ICMPV6_MGM_REDUCTION)
1815 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1816 else
1817 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1818 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1819 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1820 } else
1821 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1822
1823 if (likely(idev != NULL))
1824 in6_dev_put(idev);
1825 return;
1da177e4
LT		 1826}
1827
1828static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1829 struct in6_addr *psfsrc)
1830{
1831 struct ip6_sf_list *psf, *psf_prev;
1832 int rv = 0;
1833
1834 psf_prev = NULL;
1835 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1836 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1837 break;
1838 psf_prev = psf;
1839 }
1840 if (!psf || psf->sf_count[sfmode] == 0) {
1841 /* source filter not found, or count wrong => bug */
1842 return -ESRCH;
1843 }
1844 psf->sf_count[sfmode]--;
1845 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1846 struct inet6_dev *idev = pmc->idev;
1847
1848 /* no more filters for this source */
1849 if (psf_prev)
1850 psf_prev->sf_next = psf->sf_next;
1851 else
1852 pmc->mca_sources = psf->sf_next;
1853 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1854 !MLD_V1_SEEN(idev)) {
1855 psf->sf_crcount = idev->mc_qrv;
1856 psf->sf_next = pmc->mca_tomb;
1857 pmc->mca_tomb = psf;
1858 rv = 1;
1859 } else
1860 kfree(psf);
1861 }
1862 return rv;
1863}
1864
1865static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1866 int sfmode, int sfcount, struct in6_addr *psfsrc,
1867 int delta)
1868{
1869 struct ifmcaddr6 *pmc;
1870 int changerec = 0;
1871 int i, err;
1872
1873 if (!idev)
1874 return -ENODEV;
1875 read_lock_bh(&idev->lock);
1876 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1877 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1878 break;
1879 }
1880 if (!pmc) {
1881 /* MCA not found?? bug */
1882 read_unlock_bh(&idev->lock);
1883 return -ESRCH;
1884 }
1885 spin_lock_bh(&pmc->mca_lock);
1886 sf_markstate(pmc);
1887 if (!delta) {
1888 if (!pmc->mca_sfcount[sfmode]) {
1889 spin_unlock_bh(&pmc->mca_lock);
1890 read_unlock_bh(&idev->lock);
1891 return -EINVAL;
1892 }
1893 pmc->mca_sfcount[sfmode]--;
1894 }
1895 err = 0;
1896 for (i=0; i<sfcount; i++) {
1897 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1898
1899 changerec |= rv > 0;
1900 if (!err && rv < 0)
1901 err = rv;
1902 }
1903 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1904 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1905 pmc->mca_sfcount[MCAST_INCLUDE]) {
1906 struct ip6_sf_list *psf;
1907
1908 /* filter mode change */
1909 pmc->mca_sfmode = MCAST_INCLUDE;
1910 pmc->mca_crcount = idev->mc_qrv;
1911 idev->mc_ifc_count = pmc->mca_crcount;
1912 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1913 psf->sf_crcount = 0;
1914 mld_ifc_event(pmc->idev);
1915 } else if (sf_setstate(pmc) || changerec)
1916 mld_ifc_event(pmc->idev);
1917 spin_unlock_bh(&pmc->mca_lock);
1918 read_unlock_bh(&idev->lock);
1919 return err;
1920}
1921
1922/*
1923 * Add multicast single-source filter to the interface list
1924 */
1925static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1926 struct in6_addr *psfsrc, int delta)
1927{
1928 struct ip6_sf_list *psf, *psf_prev;
1929
1930 psf_prev = NULL;
1931 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1932 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1933 break;
1934 psf_prev = psf;
1935 }
1936 if (!psf) {
8b3a7005 1937 psf = kmalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1938 if (!psf)
1939 return -ENOBUFS;
1940 memset(psf, 0, sizeof(*psf));
1941 psf->sf_addr = *psfsrc;
1942 if (psf_prev) {
1943 psf_prev->sf_next = psf;
1944 } else
1945 pmc->mca_sources = psf;
1946 }
1947 psf->sf_count[sfmode]++;
1948 return 0;
1949}
1950
1951static void sf_markstate(struct ifmcaddr6 *pmc)
1952{
1953 struct ip6_sf_list *psf;
1954 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1955
1956 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1957 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1958 psf->sf_oldin = mca_xcount ==
1959 psf->sf_count[MCAST_EXCLUDE] &&
1960 !psf->sf_count[MCAST_INCLUDE];
1961 } else
1962 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1963}
1964
1965static int sf_setstate(struct ifmcaddr6 *pmc)
1966{
7add2a43 1967 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 1968 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1969 int qrv = pmc->idev->mc_qrv;
1970 int new_in, rv;
1971
1972 rv = 0;
1973 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1974 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1975 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1976 !psf->sf_count[MCAST_INCLUDE];
1977 } else
1978 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 1979 if (new_in) {
1980 if (!psf->sf_oldin) {
1981 struct ip6_sf_list *prev = 0;
1982
1983 for (dpsf=pmc->mca_tomb; dpsf;
1984 dpsf=dpsf->sf_next) {
1985 if (ipv6_addr_equal(&dpsf->sf_addr,
1986 &psf->sf_addr))
1987 break;
1988 prev = dpsf;
1989 }
1990 if (dpsf) {
1991 if (prev)
1992 prev->sf_next = dpsf->sf_next;
1993 else
1994 pmc->mca_tomb = dpsf->sf_next;
1995 kfree(dpsf);
1996 }
1997 psf->sf_crcount = qrv;
1998 rv++;
1999 }
2000 } else if (psf->sf_oldin) {
2001 psf->sf_crcount = 0;
2002 /*
2003 * add or update "delete" records if an active filter
2004 * is now inactive
2005 */
2006 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2007 if (ipv6_addr_equal(&dpsf->sf_addr,
2008 &psf->sf_addr))
2009 break;
2010 if (!dpsf) {
2011 dpsf = (struct ip6_sf_list *)
2012 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2013 if (!dpsf)
2014 continue;
2015 *dpsf = *psf;
2016 /* pmc->mca_lock held by callers */
2017 dpsf->sf_next = pmc->mca_tomb;
2018 pmc->mca_tomb = dpsf;
2019 }
2020 dpsf->sf_crcount = qrv;
1da177e4
LT		 2021 rv++;
2022 }
2023 }
2024 return rv;
2025}
2026
2027/*
2028 * Add multicast source filter list to the interface list
2029 */
2030static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2031 int sfmode, int sfcount, struct in6_addr *psfsrc,
2032 int delta)
2033{
2034 struct ifmcaddr6 *pmc;
2035 int isexclude;
2036 int i, err;
2037
2038 if (!idev)
2039 return -ENODEV;
2040 read_lock_bh(&idev->lock);
2041 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2042 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2043 break;
2044 }
2045 if (!pmc) {
2046 /* MCA not found?? bug */
2047 read_unlock_bh(&idev->lock);
2048 return -ESRCH;
2049 }
2050 spin_lock_bh(&pmc->mca_lock);
2051
2052 sf_markstate(pmc);
2053 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2054 if (!delta)
2055 pmc->mca_sfcount[sfmode]++;
2056 err = 0;
2057 for (i=0; i<sfcount; i++) {
2058 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2059 if (err)
2060 break;
2061 }
2062 if (err) {
2063 int j;
2064
2065 if (!delta)
2066 pmc->mca_sfcount[sfmode]--;
2067 for (j=0; j<i; j++)
2068 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2069 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2070 struct inet6_dev *idev = pmc->idev;
2071 struct ip6_sf_list *psf;
2072
2073 /* filter mode change */
2074 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2075 pmc->mca_sfmode = MCAST_EXCLUDE;
2076 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2077 pmc->mca_sfmode = MCAST_INCLUDE;
2078 /* else no filters; keep old mode for reports */
2079
2080 pmc->mca_crcount = idev->mc_qrv;
2081 idev->mc_ifc_count = pmc->mca_crcount;
2082 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2083 psf->sf_crcount = 0;
2084 mld_ifc_event(idev);
2085 } else if (sf_setstate(pmc))
2086 mld_ifc_event(idev);
2087 spin_unlock_bh(&pmc->mca_lock);
2088 read_unlock_bh(&idev->lock);
2089 return err;
2090}
2091
2092static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2093{
2094 struct ip6_sf_list *psf, *nextpsf;
2095
2096 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2097 nextpsf = psf->sf_next;
2098 kfree(psf);
2099 }
2100 pmc->mca_tomb = NULL;
2101 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2102 nextpsf = psf->sf_next;
2103 kfree(psf);
2104 }
2105 pmc->mca_sources = NULL;
2106 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2107 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2108 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2109}
2110
2111
2112static void igmp6_join_group(struct ifmcaddr6 *ma)
2113{
2114 unsigned long delay;
2115
2116 if (ma->mca_flags & MAF_NOREPORT)
2117 return;
2118
2119 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2120
2121 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2122
2123 spin_lock_bh(&ma->mca_lock);
2124 if (del_timer(&ma->mca_timer)) {
2125 atomic_dec(&ma->mca_refcnt);
2126 delay = ma->mca_timer.expires - jiffies;
2127 }
2128
2129 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2130 atomic_inc(&ma->mca_refcnt);
2131 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2132 spin_unlock_bh(&ma->mca_lock);
2133}
2134
2135static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2136 struct inet6_dev *idev)
2137{
2138 int err;
2139
5ab4a6c8
DS		 2140 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2141 * so no other readers or writers of iml or its sflist
2142 */
1da177e4
LT		 2143 if (iml->sflist == 0) {
2144 /* any-source empty exclude case */
2145 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2146 }
2147 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2148 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2149 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2150 iml->sflist = NULL;
2151 return err;
2152}
2153
2154static void igmp6_leave_group(struct ifmcaddr6 *ma)
2155{
2156 if (MLD_V1_SEEN(ma->idev)) {
2157 if (ma->mca_flags & MAF_LAST_REPORTER)
2158 igmp6_send(&ma->mca_addr, ma->idev->dev,
2159 ICMPV6_MGM_REDUCTION);
2160 } else {
2161 mld_add_delrec(ma->idev, ma);
2162 mld_ifc_event(ma->idev);
2163 }
2164}
2165
2166static void mld_gq_timer_expire(unsigned long data)
2167{
2168 struct inet6_dev *idev = (struct inet6_dev *)data;
2169
2170 idev->mc_gq_running = 0;
2171 mld_send_report(idev, NULL);
2172 __in6_dev_put(idev);
2173}
2174
2175static void mld_ifc_timer_expire(unsigned long data)
2176{
2177 struct inet6_dev *idev = (struct inet6_dev *)data;
2178
2179 mld_send_cr(idev);
2180 if (idev->mc_ifc_count) {
2181 idev->mc_ifc_count--;
2182 if (idev->mc_ifc_count)
2183 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2184 }
2185 __in6_dev_put(idev);
2186}
2187
2188static void mld_ifc_event(struct inet6_dev *idev)
2189{
2190 if (MLD_V1_SEEN(idev))
2191 return;
2192 idev->mc_ifc_count = idev->mc_qrv;
2193 mld_ifc_start_timer(idev, 1);
2194}
2195
2196
2197static void igmp6_timer_handler(unsigned long data)
2198{
2199 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2200
2201 if (MLD_V1_SEEN(ma->idev))
2202 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2203 else
2204 mld_send_report(ma->idev, ma);
2205
2206 spin_lock(&ma->mca_lock);
2207 ma->mca_flags |= MAF_LAST_REPORTER;
2208 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2209 spin_unlock(&ma->mca_lock);
2210 ma_put(ma);
2211}
2212
2213/* Device going down */
2214
2215void ipv6_mc_down(struct inet6_dev *idev)
2216{
2217 struct ifmcaddr6 *i;
2218
2219 /* Withdraw multicast list */
2220
2221 read_lock_bh(&idev->lock);
2222 idev->mc_ifc_count = 0;
2223 if (del_timer(&idev->mc_ifc_timer))
2224 __in6_dev_put(idev);
2225 idev->mc_gq_running = 0;
2226 if (del_timer(&idev->mc_gq_timer))
2227 __in6_dev_put(idev);
2228
2229 for (i = idev->mc_list; i; i=i->next)
2230 igmp6_group_dropped(i);
2231 read_unlock_bh(&idev->lock);
2232
2233 mld_clear_delrec(idev);
2234}
2235
2236
2237/* Device going up */
2238
2239void ipv6_mc_up(struct inet6_dev *idev)
2240{
2241 struct ifmcaddr6 *i;
2242
2243 /* Install multicast list, except for all-nodes (already installed) */
2244
2245 read_lock_bh(&idev->lock);
2246 for (i = idev->mc_list; i; i=i->next)
2247 igmp6_group_added(i);
2248 read_unlock_bh(&idev->lock);
2249}
2250
2251/* IPv6 device initialization. */
2252
2253void ipv6_mc_init_dev(struct inet6_dev *idev)
2254{
2255 struct in6_addr maddr;
2256
2257 write_lock_bh(&idev->lock);
2258 rwlock_init(&idev->mc_lock);
2259 idev->mc_gq_running = 0;
2260 init_timer(&idev->mc_gq_timer);
2261 idev->mc_gq_timer.data = (unsigned long) idev;
2262 idev->mc_gq_timer.function = &mld_gq_timer_expire;
2263 idev->mc_tomb = NULL;
2264 idev->mc_ifc_count = 0;
2265 init_timer(&idev->mc_ifc_timer);
2266 idev->mc_ifc_timer.data = (unsigned long) idev;
2267 idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2268 idev->mc_qrv = MLD_QRV_DEFAULT;
2269 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2270 idev->mc_v1_seen = 0;
2271 write_unlock_bh(&idev->lock);
2272
2273 /* Add all-nodes address. */
2274 ipv6_addr_all_nodes(&maddr);
2275 ipv6_dev_mc_inc(idev->dev, &maddr);
2276}
2277
2278/*
2279 * Device is about to be destroyed: clean up.
2280 */
2281
2282void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2283{
2284 struct ifmcaddr6 *i;
2285 struct in6_addr maddr;
2286
2287 /* Deactivate timers */
2288 ipv6_mc_down(idev);
2289
2290 /* Delete all-nodes address. */
2291 ipv6_addr_all_nodes(&maddr);
2292
2293 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2294 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2295 * fail.
2296 */
2297 __ipv6_dev_mc_dec(idev, &maddr);
2298
2299 if (idev->cnf.forwarding) {
2300 ipv6_addr_all_routers(&maddr);
2301 __ipv6_dev_mc_dec(idev, &maddr);
2302 }
2303
2304 write_lock_bh(&idev->lock);
2305 while ((i = idev->mc_list) != NULL) {
2306 idev->mc_list = i->next;
2307 write_unlock_bh(&idev->lock);
2308
2309 igmp6_group_dropped(i);
2310 ma_put(i);
2311
2312 write_lock_bh(&idev->lock);
2313 }
2314 write_unlock_bh(&idev->lock);
2315}
2316
2317#ifdef CONFIG_PROC_FS
2318struct igmp6_mc_iter_state {
2319 struct net_device *dev;
2320 struct inet6_dev *idev;
2321};
2322
2323#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2324
2325static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2326{
2327 struct ifmcaddr6 *im = NULL;
2328 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2329
2330 for (state->dev = dev_base, state->idev = NULL;
2331 state->dev;
2332 state->dev = state->dev->next) {
2333 struct inet6_dev *idev;
2334 idev = in6_dev_get(state->dev);
2335 if (!idev)
2336 continue;
2337 read_lock_bh(&idev->lock);
2338 im = idev->mc_list;
2339 if (im) {
2340 state->idev = idev;
2341 break;
2342 }
2343 read_unlock_bh(&idev->lock);
2344 in6_dev_put(idev);
2345 }
2346 return im;
2347}
2348
2349static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2350{
2351 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2352
2353 im = im->next;
2354 while (!im) {
2355 if (likely(state->idev != NULL)) {
2356 read_unlock_bh(&state->idev->lock);
2357 in6_dev_put(state->idev);
2358 }
2359 state->dev = state->dev->next;
2360 if (!state->dev) {
2361 state->idev = NULL;
2362 break;
2363 }
2364 state->idev = in6_dev_get(state->dev);
2365 if (!state->idev)
2366 continue;
2367 read_lock_bh(&state->idev->lock);
2368 im = state->idev->mc_list;
2369 }
2370 return im;
2371}
2372
2373static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2374{
2375 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2376 if (im)
2377 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2378 --pos;
2379 return pos ? NULL : im;
2380}
2381
2382static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2383{
2384 read_lock(&dev_base_lock);
2385 return igmp6_mc_get_idx(seq, *pos);
2386}
2387
2388static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2389{
2390 struct ifmcaddr6 *im;
2391 im = igmp6_mc_get_next(seq, v);
2392 ++*pos;
2393 return im;
2394}
2395
2396static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2397{
2398 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2399 if (likely(state->idev != NULL)) {
2400 read_unlock_bh(&state->idev->lock);
2401 in6_dev_put(state->idev);
2402 state->idev = NULL;
2403 }
2404 state->dev = NULL;
2405 read_unlock(&dev_base_lock);
2406}
2407
2408static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2409{
2410 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2411 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2412
2413 seq_printf(seq,
9343e79a 2414 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
1da177e4
LT		 2415 state->dev->ifindex, state->dev->name,
2416 NIP6(im->mca_addr),
2417 im->mca_users, im->mca_flags,
2418 (im->mca_flags&MAF_TIMER_RUNNING) ?
2419 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2420 return 0;
2421}
2422
2423static struct seq_operations igmp6_mc_seq_ops = {
2424 .start = igmp6_mc_seq_start,
2425 .next = igmp6_mc_seq_next,
2426 .stop = igmp6_mc_seq_stop,
2427 .show = igmp6_mc_seq_show,
2428};
2429
2430static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2431{
2432 struct seq_file *seq;
2433 int rc = -ENOMEM;
2434 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2435
2436 if (!s)
2437 goto out;
2438
2439 rc = seq_open(file, &igmp6_mc_seq_ops);
2440 if (rc)
2441 goto out_kfree;
2442
2443 seq = file->private_data;
2444 seq->private = s;
2445 memset(s, 0, sizeof(*s));
2446out:
2447 return rc;
2448out_kfree:
2449 kfree(s);
2450 goto out;
2451}
2452
2453static struct file_operations igmp6_mc_seq_fops = {
2454 .owner = THIS_MODULE,
2455 .open = igmp6_mc_seq_open,
2456 .read = seq_read,
2457 .llseek = seq_lseek,
2458 .release = seq_release_private,
2459};
2460
2461struct igmp6_mcf_iter_state {
2462 struct net_device *dev;
2463 struct inet6_dev *idev;
2464 struct ifmcaddr6 *im;
2465};
2466
2467#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2468
2469static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2470{
2471 struct ip6_sf_list *psf = NULL;
2472 struct ifmcaddr6 *im = NULL;
2473 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2474
2475 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2476 state->dev;
2477 state->dev = state->dev->next) {
2478 struct inet6_dev *idev;
2479 idev = in6_dev_get(state->dev);
2480 if (unlikely(idev == NULL))
2481 continue;
2482 read_lock_bh(&idev->lock);
2483 im = idev->mc_list;
2484 if (likely(im != NULL)) {
2485 spin_lock_bh(&im->mca_lock);
2486 psf = im->mca_sources;
2487 if (likely(psf != NULL)) {
2488 state->im = im;
2489 state->idev = idev;
2490 break;
2491 }
2492 spin_unlock_bh(&im->mca_lock);
2493 }
2494 read_unlock_bh(&idev->lock);
2495 in6_dev_put(idev);
2496 }
2497 return psf;
2498}
2499
2500static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2501{
2502 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2503
2504 psf = psf->sf_next;
2505 while (!psf) {
2506 spin_unlock_bh(&state->im->mca_lock);
2507 state->im = state->im->next;
2508 while (!state->im) {
2509 if (likely(state->idev != NULL)) {
2510 read_unlock_bh(&state->idev->lock);
2511 in6_dev_put(state->idev);
2512 }
2513 state->dev = state->dev->next;
2514 if (!state->dev) {
2515 state->idev = NULL;
2516 goto out;
2517 }
2518 state->idev = in6_dev_get(state->dev);
2519 if (!state->idev)
2520 continue;
2521 read_lock_bh(&state->idev->lock);
2522 state->im = state->idev->mc_list;
2523 }
2524 if (!state->im)
2525 break;
2526 spin_lock_bh(&state->im->mca_lock);
2527 psf = state->im->mca_sources;
2528 }
2529out:
2530 return psf;
2531}
2532
2533static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2534{
2535 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2536 if (psf)
2537 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2538 --pos;
2539 return pos ? NULL : psf;
2540}
2541
2542static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2543{
2544 read_lock(&dev_base_lock);
2545 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2546}
2547
2548static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2549{
2550 struct ip6_sf_list *psf;
2551 if (v == SEQ_START_TOKEN)
2552 psf = igmp6_mcf_get_first(seq);
2553 else
2554 psf = igmp6_mcf_get_next(seq, v);
2555 ++*pos;
2556 return psf;
2557}
2558
2559static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2560{
2561 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2562 if (likely(state->im != NULL)) {
2563 spin_unlock_bh(&state->im->mca_lock);
2564 state->im = NULL;
2565 }
2566 if (likely(state->idev != NULL)) {
2567 read_unlock_bh(&state->idev->lock);
2568 in6_dev_put(state->idev);
2569 state->idev = NULL;
2570 }
2571 state->dev = NULL;
2572 read_unlock(&dev_base_lock);
2573}
2574
2575static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2576{
2577 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2578 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2579
2580 if (v == SEQ_START_TOKEN) {
2581 seq_printf(seq,
2582 "%3s %6s "
9343e79a 2583 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2584 "Device", "Multicast Address",
2585 "Source Address", "INC", "EXC");
2586 } else {
2587 seq_printf(seq,
9343e79a 2588 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
1da177e4
LT		 2589 state->dev->ifindex, state->dev->name,
2590 NIP6(state->im->mca_addr),
2591 NIP6(psf->sf_addr),
2592 psf->sf_count[MCAST_INCLUDE],
2593 psf->sf_count[MCAST_EXCLUDE]);
2594 }
2595 return 0;
2596}
2597
2598static struct seq_operations igmp6_mcf_seq_ops = {
2599 .start = igmp6_mcf_seq_start,
2600 .next = igmp6_mcf_seq_next,
2601 .stop = igmp6_mcf_seq_stop,
2602 .show = igmp6_mcf_seq_show,
2603};
2604
2605static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2606{
2607 struct seq_file *seq;
2608 int rc = -ENOMEM;
2609 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2610
2611 if (!s)
2612 goto out;
2613
2614 rc = seq_open(file, &igmp6_mcf_seq_ops);
2615 if (rc)
2616 goto out_kfree;
2617
2618 seq = file->private_data;
2619 seq->private = s;
2620 memset(s, 0, sizeof(*s));
2621out:
2622 return rc;
2623out_kfree:
2624 kfree(s);
2625 goto out;
2626}
2627
2628static struct file_operations igmp6_mcf_seq_fops = {
2629 .owner = THIS_MODULE,
2630 .open = igmp6_mcf_seq_open,
2631 .read = seq_read,
2632 .llseek = seq_lseek,
2633 .release = seq_release_private,
2634};
2635#endif
2636
2637int __init igmp6_init(struct net_proto_family *ops)
2638{
2639 struct ipv6_pinfo *np;
2640 struct sock *sk;
2641 int err;
2642
2643 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2644 if (err < 0) {
2645 printk(KERN_ERR
2646 "Failed to initialize the IGMP6 control socket (err %d).\n",
2647 err);
2648 igmp6_socket = NULL; /* For safety. */
2649 return err;
2650 }
2651
2652 sk = igmp6_socket->sk;
2653 sk->sk_allocation = GFP_ATOMIC;
2654 sk->sk_prot->unhash(sk);
2655
2656 np = inet6_sk(sk);
2657 np->hop_limit = 1;
2658
2659#ifdef CONFIG_PROC_FS
2660 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2661 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2662#endif
2663
2664 return 0;
2665}
2666
2667void igmp6_cleanup(void)
2668{
2669 sock_release(igmp6_socket);
2670 igmp6_socket = NULL; /* for safety */
2671
2672#ifdef CONFIG_PROC_FS
2673 proc_net_remove("mcfilter6");
2674 proc_net_remove("igmp6");
2675#endif
2676}
Clone of davem's net-next-2.6 tree