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netfilter: ipv4: use NFPROTO values for NF_HOOK invocation
[net-next-2.6.git] / net / ipv6 / mcast.c
CommitLineData
1da177e4
LT		 1/*
2 * Multicast support for IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4 7 *
1ab1457c 8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
1da177e4
LT		 9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16/* Changes:
17 *
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
26 * - MLDv2 support
27 */
28
1da177e4
LT		 29#include <linux/module.h>
30#include <linux/errno.h>
31#include <linux/types.h>
32#include <linux/string.h>
33#include <linux/socket.h>
34#include <linux/sockios.h>
35#include <linux/jiffies.h>
36#include <linux/times.h>
37#include <linux/net.h>
38#include <linux/in.h>
39#include <linux/in6.h>
40#include <linux/netdevice.h>
41#include <linux/if_arp.h>
42#include <linux/route.h>
43#include <linux/init.h>
44#include <linux/proc_fs.h>
45#include <linux/seq_file.h>
46
47#include <linux/netfilter.h>
48#include <linux/netfilter_ipv6.h>
49
457c4cbc 50#include <net/net_namespace.h>
1da177e4
LT		 51#include <net/sock.h>
52#include <net/snmp.h>
53
54#include <net/ipv6.h>
55#include <net/protocol.h>
56#include <net/if_inet6.h>
57#include <net/ndisc.h>
58#include <net/addrconf.h>
59#include <net/ip6_route.h>
1ed8516f 60#include <net/inet_common.h>
1da177e4
LT		 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;
8a74ff77 86 __be16 grec_nsrcs;
1da177e4
LT		 87 struct in6_addr grec_mca;
88 struct in6_addr grec_src[0];
89};
90
91struct mld2_report {
92 __u8 type;
93 __u8 resv1;
868c86bc 94 __sum16 csum;
8a74ff77
AV		 95 __be16 resv2;
96 __be16 ngrec;
1da177e4
LT		 97 struct mld2_grec grec[0];
98};
99
100struct mld2_query {
101 __u8 type;
102 __u8 code;
868c86bc 103 __sum16 csum;
8a74ff77
AV		 104 __be16 mrc;
105 __be16 resv1;
1da177e4
LT		 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;
8a74ff77 119 __be16 nsrcs;
1da177e4
LT		 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
1da177e4
LT		 128static void igmp6_join_group(struct ifmcaddr6 *ma);
129static void igmp6_leave_group(struct ifmcaddr6 *ma);
130static void igmp6_timer_handler(unsigned long data);
131
132static void mld_gq_timer_expire(unsigned long data);
133static void mld_ifc_timer_expire(unsigned long data);
134static void mld_ifc_event(struct inet6_dev *idev);
135static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
136static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
137static void mld_clear_delrec(struct inet6_dev *idev);
138static int sf_setstate(struct ifmcaddr6 *pmc);
139static void sf_markstate(struct ifmcaddr6 *pmc);
140static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
141static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
142 int sfmode, int sfcount, struct in6_addr *psfsrc,
143 int delta);
144static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
145 int sfmode, int sfcount, struct in6_addr *psfsrc,
146 int delta);
147static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
148 struct inet6_dev *idev);
149
150
151#define IGMP6_UNSOLICITED_IVAL (10*HZ)
152#define MLD_QRV_DEFAULT 2
153
53b7997f 154#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
1da177e4
LT		 155 (idev)->cnf.force_mld_version == 1 || \
156 ((idev)->mc_v1_seen && \
157 time_before(jiffies, (idev)->mc_v1_seen)))
158
159#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
160#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
161 ((value) < (thresh) ? (value) : \
f12baeab 162 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
1da177e4
LT		 163 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
164
1da177e4
LT		 165#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
166
6f4353d8 167#define IPV6_MLD_MAX_MSF 64
1da177e4 168
ab32ea5d 169int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
1da177e4
LT		 170
171/*
172 * socket join on multicast group
173 */
174
9acd9f3a 175int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 176{
177 struct net_device *dev = NULL;
178 struct ipv6_mc_socklist *mc_lst;
179 struct ipv6_pinfo *np = inet6_sk(sk);
3b1e0a65 180 struct net *net = sock_net(sk);
1da177e4
LT		 181 int err;
182
183 if (!ipv6_addr_is_multicast(addr))
184 return -EINVAL;
185
c9e3e8b6
DS		 186 read_lock_bh(&ipv6_sk_mc_lock);
187 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
188 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
189 ipv6_addr_equal(&mc_lst->addr, addr)) {
190 read_unlock_bh(&ipv6_sk_mc_lock);
191 return -EADDRINUSE;
192 }
193 }
194 read_unlock_bh(&ipv6_sk_mc_lock);
195
1da177e4
LT		 196 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
197
198 if (mc_lst == NULL)
199 return -ENOMEM;
200
201 mc_lst->next = NULL;
202 ipv6_addr_copy(&mc_lst->addr, addr);
203
204 if (ifindex == 0) {
205 struct rt6_info *rt;
b8ad0cbc 206 rt = rt6_lookup(net, addr, NULL, 0, 0);
1da177e4
LT		 207 if (rt) {
208 dev = rt->rt6i_dev;
209 dev_hold(dev);
210 dst_release(&rt->u.dst);
211 }
212 } else
b8ad0cbc 213 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 214
215 if (dev == NULL) {
216 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
217 return -ENODEV;
218 }
219
220 mc_lst->ifindex = dev->ifindex;
221 mc_lst->sfmode = MCAST_EXCLUDE;
196433c5 222 rwlock_init(&mc_lst->sflock);
1da177e4
LT		 223 mc_lst->sflist = NULL;
224
225 /*
226 * now add/increase the group membership on the device
227 */
228
229 err = ipv6_dev_mc_inc(dev, addr);
230
231 if (err) {
232 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
233 dev_put(dev);
234 return err;
235 }
236
237 write_lock_bh(&ipv6_sk_mc_lock);
238 mc_lst->next = np->ipv6_mc_list;
239 np->ipv6_mc_list = mc_lst;
240 write_unlock_bh(&ipv6_sk_mc_lock);
241
242 dev_put(dev);
243
244 return 0;
245}
246
247/*
248 * socket leave on multicast group
249 */
9acd9f3a 250int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
1da177e4
LT		 251{
252 struct ipv6_pinfo *np = inet6_sk(sk);
253 struct ipv6_mc_socklist *mc_lst, **lnk;
3b1e0a65 254 struct net *net = sock_net(sk);
1da177e4
LT		 255
256 write_lock_bh(&ipv6_sk_mc_lock);
257 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
258 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
259 ipv6_addr_equal(&mc_lst->addr, addr)) {
260 struct net_device *dev;
261
262 *lnk = mc_lst->next;
263 write_unlock_bh(&ipv6_sk_mc_lock);
264
b8ad0cbc
DL		 265 dev = dev_get_by_index(net, mc_lst->ifindex);
266 if (dev != NULL) {
1da177e4
LT		 267 struct inet6_dev *idev = in6_dev_get(dev);
268
acd6e00b 269 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 270 if (idev) {
1da177e4
LT		 271 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
272 in6_dev_put(idev);
273 }
274 dev_put(dev);
acd6e00b
DS		 275 } else
276 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 277 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
278 return 0;
279 }
280 }
281 write_unlock_bh(&ipv6_sk_mc_lock);
282
9951f036 283 return -EADDRNOTAVAIL;
1da177e4
LT		 284}
285
b8ad0cbc
DL		 286static struct inet6_dev *ip6_mc_find_dev(struct net *net,
287 struct in6_addr *group,
288 int ifindex)
1da177e4
LT		 289{
290 struct net_device *dev = NULL;
291 struct inet6_dev *idev = NULL;
292
293 if (ifindex == 0) {
294 struct rt6_info *rt;
295
b8ad0cbc 296 rt = rt6_lookup(net, group, NULL, 0, 0);
1da177e4
LT		 297 if (rt) {
298 dev = rt->rt6i_dev;
299 dev_hold(dev);
300 dst_release(&rt->u.dst);
301 }
302 } else
b8ad0cbc 303 dev = dev_get_by_index(net, ifindex);
1da177e4
LT		 304
305 if (!dev)
448eb71f 306 goto nodev;
1da177e4 307 idev = in6_dev_get(dev);
448eb71f
IJ		 308 if (!idev)
309 goto release;
1da177e4 310 read_lock_bh(&idev->lock);
448eb71f
IJ		 311 if (idev->dead)
312 goto unlock_release;
313
1da177e4 314 return idev;
448eb71f
IJ		 315
316unlock_release:
317 read_unlock_bh(&idev->lock);
318 in6_dev_put(idev);
319release:
320 dev_put(dev);
321nodev:
322 return NULL;
1da177e4
LT		 323}
324
325void ipv6_sock_mc_close(struct sock *sk)
326{
327 struct ipv6_pinfo *np = inet6_sk(sk);
328 struct ipv6_mc_socklist *mc_lst;
3b1e0a65 329 struct net *net = sock_net(sk);
1da177e4
LT		 330
331 write_lock_bh(&ipv6_sk_mc_lock);
332 while ((mc_lst = np->ipv6_mc_list) != NULL) {
333 struct net_device *dev;
334
335 np->ipv6_mc_list = mc_lst->next;
336 write_unlock_bh(&ipv6_sk_mc_lock);
337
b8ad0cbc 338 dev = dev_get_by_index(net, mc_lst->ifindex);
1da177e4
LT		 339 if (dev) {
340 struct inet6_dev *idev = in6_dev_get(dev);
341
acd6e00b 342 (void) ip6_mc_leave_src(sk, mc_lst, idev);
1da177e4 343 if (idev) {
1da177e4
LT		 344 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
345 in6_dev_put(idev);
346 }
347 dev_put(dev);
acd6e00b
DS		 348 } else
349 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
1da177e4
LT		 350
351 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
352
353 write_lock_bh(&ipv6_sk_mc_lock);
354 }
355 write_unlock_bh(&ipv6_sk_mc_lock);
356}
357
358int ip6_mc_source(int add, int omode, struct sock *sk,
359 struct group_source_req *pgsr)
360{
361 struct in6_addr *source, *group;
362 struct ipv6_mc_socklist *pmc;
363 struct net_device *dev;
364 struct inet6_dev *idev;
365 struct ipv6_pinfo *inet6 = inet6_sk(sk);
366 struct ip6_sf_socklist *psl;
3b1e0a65 367 struct net *net = sock_net(sk);
1da177e4 368 int i, j, rv;
c9e3e8b6 369 int leavegroup = 0;
5ab4a6c8 370 int pmclocked = 0;
1da177e4
LT		 371 int err;
372
1da177e4
LT		 373 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
374 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
375
376 if (!ipv6_addr_is_multicast(group))
377 return -EINVAL;
378
b8ad0cbc 379 idev = ip6_mc_find_dev(net, group, pgsr->gsr_interface);
1da177e4
LT		 380 if (!idev)
381 return -ENODEV;
382 dev = idev->dev;
383
384 err = -EADDRNOTAVAIL;
385
c9e3e8b6 386 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 387 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
389 continue;
390 if (ipv6_addr_equal(&pmc->addr, group))
391 break;
392 }
917f2f10
DS		 393 if (!pmc) { /* must have a prior join */
394 err = -EINVAL;
1da177e4 395 goto done;
917f2f10 396 }
1da177e4
LT		 397 /* if a source filter was set, must be the same mode as before */
398 if (pmc->sflist) {
917f2f10
DS		 399 if (pmc->sfmode != omode) {
400 err = -EINVAL;
1da177e4 401 goto done;
917f2f10 402 }
1da177e4
LT		 403 } else if (pmc->sfmode != omode) {
404 /* allow mode switches for empty-set filters */
405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
407 pmc->sfmode = omode;
408 }
409
5ab4a6c8
DS		 410 write_lock_bh(&pmc->sflock);
411 pmclocked = 1;
412
1da177e4
LT		 413 psl = pmc->sflist;
414 if (!add) {
415 if (!psl)
917f2f10 416 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 417 rv = !0;
418 for (i=0; i<psl->sl_count; i++) {
419 rv = memcmp(&psl->sl_addr[i], source,
420 sizeof(struct in6_addr));
421 if (rv == 0)
422 break;
423 }
424 if (rv) /* source not found */
917f2f10 425 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 426
c9e3e8b6
DS		 427 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
428 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
429 leavegroup = 1;
430 goto done;
431 }
432
1da177e4
LT		 433 /* update the interface filter */
434 ip6_mc_del_src(idev, group, omode, 1, source, 1);
435
436 for (j=i+1; j<psl->sl_count; j++)
437 psl->sl_addr[j-1] = psl->sl_addr[j];
438 psl->sl_count--;
439 err = 0;
440 goto done;
441 }
442 /* else, add a new source to the filter */
443
444 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
445 err = -ENOBUFS;
446 goto done;
447 }
448 if (!psl || psl->sl_count == psl->sl_max) {
449 struct ip6_sf_socklist *newpsl;
450 int count = IP6_SFBLOCK;
451
452 if (psl)
453 count += psl->sl_max;
8b3a7005 454 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
1da177e4
LT		 455 if (!newpsl) {
456 err = -ENOBUFS;
457 goto done;
458 }
459 newpsl->sl_max = count;
460 newpsl->sl_count = count - IP6_SFBLOCK;
461 if (psl) {
462 for (i=0; i<psl->sl_count; i++)
463 newpsl->sl_addr[i] = psl->sl_addr[i];
464 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
465 }
466 pmc->sflist = psl = newpsl;
467 }
468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
469 for (i=0; i<psl->sl_count; i++) {
470 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
471 if (rv == 0)
472 break;
473 }
474 if (rv == 0) /* address already there is an error */
475 goto done;
476 for (j=psl->sl_count-1; j>=i; j--)
477 psl->sl_addr[j+1] = psl->sl_addr[j];
478 psl->sl_addr[i] = *source;
479 psl->sl_count++;
480 err = 0;
481 /* update the interface list */
482 ip6_mc_add_src(idev, group, omode, 1, source, 1);
483done:
5ab4a6c8
DS		 484 if (pmclocked)
485 write_unlock_bh(&pmc->sflock);
c9e3e8b6 486 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 487 read_unlock_bh(&idev->lock);
488 in6_dev_put(idev);
489 dev_put(dev);
c9e3e8b6
DS		 490 if (leavegroup)
491 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 492 return err;
493}
494
495int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
496{
497 struct in6_addr *group;
498 struct ipv6_mc_socklist *pmc;
499 struct net_device *dev;
500 struct inet6_dev *idev;
501 struct ipv6_pinfo *inet6 = inet6_sk(sk);
502 struct ip6_sf_socklist *newpsl, *psl;
3b1e0a65 503 struct net *net = sock_net(sk);
9951f036 504 int leavegroup = 0;
1da177e4
LT		 505 int i, err;
506
507 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
508
509 if (!ipv6_addr_is_multicast(group))
510 return -EINVAL;
511 if (gsf->gf_fmode != MCAST_INCLUDE &&
512 gsf->gf_fmode != MCAST_EXCLUDE)
513 return -EINVAL;
514
b8ad0cbc 515 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 516
517 if (!idev)
518 return -ENODEV;
519 dev = idev->dev;
1da177e4 520
9c05989b 521 err = 0;
5ab4a6c8
DS		 522 read_lock_bh(&ipv6_sk_mc_lock);
523
9951f036
DS		 524 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
525 leavegroup = 1;
526 goto done;
527 }
528
1da177e4
LT		 529 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
530 if (pmc->ifindex != gsf->gf_interface)
531 continue;
532 if (ipv6_addr_equal(&pmc->addr, group))
533 break;
534 }
917f2f10
DS		 535 if (!pmc) { /* must have a prior join */
536 err = -EINVAL;
1da177e4 537 goto done;
917f2f10 538 }
1da177e4 539 if (gsf->gf_numsrc) {
8b3a7005
KK		 540 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
541 GFP_ATOMIC);
1da177e4
LT		 542 if (!newpsl) {
543 err = -ENOBUFS;
544 goto done;
545 }
546 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
547 for (i=0; i<newpsl->sl_count; ++i) {
548 struct sockaddr_in6 *psin6;
549
550 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
551 newpsl->sl_addr[i] = psin6->sin6_addr;
552 }
553 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
554 newpsl->sl_count, newpsl->sl_addr, 0);
555 if (err) {
556 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
557 goto done;
558 }
8713dbf0 559 } else {
1da177e4 560 newpsl = NULL;
8713dbf0
YZ		 561 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
562 }
5ab4a6c8
DS		 563
564 write_lock_bh(&pmc->sflock);
1da177e4
LT		 565 psl = pmc->sflist;
566 if (psl) {
567 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
568 psl->sl_count, psl->sl_addr, 0);
569 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
570 } else
571 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
572 pmc->sflist = newpsl;
573 pmc->sfmode = gsf->gf_fmode;
5ab4a6c8 574 write_unlock_bh(&pmc->sflock);
917f2f10 575 err = 0;
1da177e4 576done:
5ab4a6c8 577 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 578 read_unlock_bh(&idev->lock);
579 in6_dev_put(idev);
580 dev_put(dev);
9951f036
DS		 581 if (leavegroup)
582 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 583 return err;
584}
585
586int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
587 struct group_filter __user *optval, int __user *optlen)
588{
589 int err, i, count, copycount;
590 struct in6_addr *group;
591 struct ipv6_mc_socklist *pmc;
592 struct inet6_dev *idev;
593 struct net_device *dev;
594 struct ipv6_pinfo *inet6 = inet6_sk(sk);
595 struct ip6_sf_socklist *psl;
3b1e0a65 596 struct net *net = sock_net(sk);
1da177e4
LT		 597
598 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
599
600 if (!ipv6_addr_is_multicast(group))
601 return -EINVAL;
602
b8ad0cbc 603 idev = ip6_mc_find_dev(net, group, gsf->gf_interface);
1da177e4
LT		 604
605 if (!idev)
606 return -ENODEV;
607
608 dev = idev->dev;
609
610 err = -EADDRNOTAVAIL;
5ab4a6c8
DS		 611 /*
612 * changes to the ipv6_mc_list require the socket lock and
613 * a read lock on ip6_sk_mc_lock. We have the socket lock,
614 * so reading the list is safe.
615 */
1da177e4
LT		 616
617 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
618 if (pmc->ifindex != gsf->gf_interface)
619 continue;
620 if (ipv6_addr_equal(group, &pmc->addr))
621 break;
622 }
623 if (!pmc) /* must have a prior join */
624 goto done;
625 gsf->gf_fmode = pmc->sfmode;
626 psl = pmc->sflist;
627 count = psl ? psl->sl_count : 0;
628 read_unlock_bh(&idev->lock);
629 in6_dev_put(idev);
630 dev_put(dev);
631
632 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
633 gsf->gf_numsrc = count;
634 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
635 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
636 return -EFAULT;
637 }
5ab4a6c8
DS		 638 /* changes to psl require the socket lock, a read lock on
639 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
640 * have the socket lock, so reading here is safe.
641 */
1da177e4
LT		 642 for (i=0; i<copycount; i++) {
643 struct sockaddr_in6 *psin6;
644 struct sockaddr_storage ss;
645
646 psin6 = (struct sockaddr_in6 *)&ss;
647 memset(&ss, 0, sizeof(ss));
648 psin6->sin6_family = AF_INET6;
649 psin6->sin6_addr = psl->sl_addr[i];
1ab1457c 650 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
1da177e4
LT		 651 return -EFAULT;
652 }
653 return 0;
654done:
655 read_unlock_bh(&idev->lock);
656 in6_dev_put(idev);
657 dev_put(dev);
658 return err;
659}
660
9acd9f3a
YH		 661int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
662 const struct in6_addr *src_addr)
1da177e4
LT		 663{
664 struct ipv6_pinfo *np = inet6_sk(sk);
665 struct ipv6_mc_socklist *mc;
666 struct ip6_sf_socklist *psl;
667 int rv = 1;
668
669 read_lock(&ipv6_sk_mc_lock);
670 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
671 if (ipv6_addr_equal(&mc->addr, mc_addr))
672 break;
673 }
674 if (!mc) {
675 read_unlock(&ipv6_sk_mc_lock);
676 return 1;
677 }
5ab4a6c8 678 read_lock(&mc->sflock);
1da177e4
LT		 679 psl = mc->sflist;
680 if (!psl) {
681 rv = mc->sfmode == MCAST_EXCLUDE;
682 } else {
683 int i;
684
685 for (i=0; i<psl->sl_count; i++) {
686 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
687 break;
688 }
689 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
690 rv = 0;
691 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
692 rv = 0;
693 }
5ab4a6c8 694 read_unlock(&mc->sflock);
1da177e4
LT		 695 read_unlock(&ipv6_sk_mc_lock);
696
697 return rv;
698}
699
700static void ma_put(struct ifmcaddr6 *mc)
701{
702 if (atomic_dec_and_test(&mc->mca_refcnt)) {
703 in6_dev_put(mc->idev);
704 kfree(mc);
705 }
706}
707
708static void igmp6_group_added(struct ifmcaddr6 *mc)
709{
710 struct net_device *dev = mc->idev->dev;
711 char buf[MAX_ADDR_LEN];
712
713 spin_lock_bh(&mc->mca_lock);
714 if (!(mc->mca_flags&MAF_LOADED)) {
715 mc->mca_flags |= MAF_LOADED;
716 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
717 dev_mc_add(dev, buf, dev->addr_len, 0);
718 }
719 spin_unlock_bh(&mc->mca_lock);
720
721 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
722 return;
723
724 if (MLD_V1_SEEN(mc->idev)) {
725 igmp6_join_group(mc);
726 return;
727 }
728 /* else v2 */
729
730 mc->mca_crcount = mc->idev->mc_qrv;
731 mld_ifc_event(mc->idev);
732}
733
734static void igmp6_group_dropped(struct ifmcaddr6 *mc)
735{
736 struct net_device *dev = mc->idev->dev;
737 char buf[MAX_ADDR_LEN];
738
739 spin_lock_bh(&mc->mca_lock);
740 if (mc->mca_flags&MAF_LOADED) {
741 mc->mca_flags &= ~MAF_LOADED;
742 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
743 dev_mc_delete(dev, buf, dev->addr_len, 0);
744 }
745
746 if (mc->mca_flags & MAF_NOREPORT)
747 goto done;
748 spin_unlock_bh(&mc->mca_lock);
749
750 if (!mc->idev->dead)
751 igmp6_leave_group(mc);
752
753 spin_lock_bh(&mc->mca_lock);
754 if (del_timer(&mc->mca_timer))
755 atomic_dec(&mc->mca_refcnt);
756done:
757 ip6_mc_clear_src(mc);
758 spin_unlock_bh(&mc->mca_lock);
759}
760
761/*
762 * deleted ifmcaddr6 manipulation
763 */
764static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
765{
766 struct ifmcaddr6 *pmc;
767
768 /* this is an "ifmcaddr6" for convenience; only the fields below
769 * are actually used. In particular, the refcnt and users are not
770 * used for management of the delete list. Using the same structure
771 * for deleted items allows change reports to use common code with
772 * non-deleted or query-response MCA's.
773 */
0c600eda 774 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
1da177e4
LT		 775 if (!pmc)
776 return;
0c600eda 777
1da177e4
LT		 778 spin_lock_bh(&im->mca_lock);
779 spin_lock_init(&pmc->mca_lock);
780 pmc->idev = im->idev;
781 in6_dev_hold(idev);
782 pmc->mca_addr = im->mca_addr;
783 pmc->mca_crcount = idev->mc_qrv;
784 pmc->mca_sfmode = im->mca_sfmode;
785 if (pmc->mca_sfmode == MCAST_INCLUDE) {
786 struct ip6_sf_list *psf;
787
788 pmc->mca_tomb = im->mca_tomb;
789 pmc->mca_sources = im->mca_sources;
790 im->mca_tomb = im->mca_sources = NULL;
791 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
792 psf->sf_crcount = pmc->mca_crcount;
793 }
794 spin_unlock_bh(&im->mca_lock);
795
6457d26b 796 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 797 pmc->next = idev->mc_tomb;
798 idev->mc_tomb = pmc;
6457d26b 799 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 800}
801
802static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
803{
804 struct ifmcaddr6 *pmc, *pmc_prev;
805 struct ip6_sf_list *psf, *psf_next;
806
6457d26b 807 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 808 pmc_prev = NULL;
809 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
810 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
811 break;
812 pmc_prev = pmc;
813 }
814 if (pmc) {
815 if (pmc_prev)
816 pmc_prev->next = pmc->next;
817 else
818 idev->mc_tomb = pmc->next;
819 }
6457d26b
SH		 820 spin_unlock_bh(&idev->mc_lock);
821
1da177e4
LT		 822 if (pmc) {
823 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
824 psf_next = psf->sf_next;
825 kfree(psf);
826 }
827 in6_dev_put(pmc->idev);
828 kfree(pmc);
829 }
830}
831
832static void mld_clear_delrec(struct inet6_dev *idev)
833{
834 struct ifmcaddr6 *pmc, *nextpmc;
835
6457d26b 836 spin_lock_bh(&idev->mc_lock);
1da177e4
LT		 837 pmc = idev->mc_tomb;
838 idev->mc_tomb = NULL;
6457d26b 839 spin_unlock_bh(&idev->mc_lock);
1da177e4
LT		 840
841 for (; pmc; pmc = nextpmc) {
842 nextpmc = pmc->next;
843 ip6_mc_clear_src(pmc);
844 in6_dev_put(pmc->idev);
845 kfree(pmc);
846 }
847
848 /* clear dead sources, too */
849 read_lock_bh(&idev->lock);
850 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
851 struct ip6_sf_list *psf, *psf_next;
852
853 spin_lock_bh(&pmc->mca_lock);
854 psf = pmc->mca_tomb;
855 pmc->mca_tomb = NULL;
856 spin_unlock_bh(&pmc->mca_lock);
857 for (; psf; psf=psf_next) {
858 psf_next = psf->sf_next;
859 kfree(psf);
860 }
861 }
862 read_unlock_bh(&idev->lock);
863}
864
865
866/*
867 * device multicast group inc (add if not found)
868 */
9acd9f3a 869int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 870{
871 struct ifmcaddr6 *mc;
872 struct inet6_dev *idev;
873
874 idev = in6_dev_get(dev);
875
876 if (idev == NULL)
877 return -EINVAL;
878
879 write_lock_bh(&idev->lock);
880 if (idev->dead) {
881 write_unlock_bh(&idev->lock);
882 in6_dev_put(idev);
883 return -ENODEV;
884 }
885
886 for (mc = idev->mc_list; mc; mc = mc->next) {
887 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
888 mc->mca_users++;
889 write_unlock_bh(&idev->lock);
890 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
891 NULL, 0);
892 in6_dev_put(idev);
893 return 0;
894 }
895 }
896
897 /*
898 * not found: create a new one.
899 */
900
0c600eda 901 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
1da177e4
LT		 902
903 if (mc == NULL) {
904 write_unlock_bh(&idev->lock);
905 in6_dev_put(idev);
906 return -ENOMEM;
907 }
908
b24b8a24 909 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
1da177e4
LT		 910
911 ipv6_addr_copy(&mc->mca_addr, addr);
912 mc->idev = idev;
913 mc->mca_users = 1;
914 /* mca_stamp should be updated upon changes */
915 mc->mca_cstamp = mc->mca_tstamp = jiffies;
916 atomic_set(&mc->mca_refcnt, 2);
917 spin_lock_init(&mc->mca_lock);
918
919 /* initial mode is (EX, empty) */
920 mc->mca_sfmode = MCAST_EXCLUDE;
921 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
922
923 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
924 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
925 mc->mca_flags |= MAF_NOREPORT;
926
927 mc->next = idev->mc_list;
928 idev->mc_list = mc;
929 write_unlock_bh(&idev->lock);
930
931 mld_del_delrec(idev, &mc->mca_addr);
932 igmp6_group_added(mc);
933 ma_put(mc);
934 return 0;
935}
936
937/*
938 * device multicast group del
939 */
9acd9f3a 940int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
1da177e4
LT		 941{
942 struct ifmcaddr6 *ma, **map;
943
944 write_lock_bh(&idev->lock);
945 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
946 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
947 if (--ma->mca_users == 0) {
948 *map = ma->next;
949 write_unlock_bh(&idev->lock);
950
951 igmp6_group_dropped(ma);
952
953 ma_put(ma);
954 return 0;
955 }
956 write_unlock_bh(&idev->lock);
957 return 0;
958 }
959 }
960 write_unlock_bh(&idev->lock);
961
962 return -ENOENT;
963}
964
9acd9f3a 965int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
1da177e4
LT		 966{
967 struct inet6_dev *idev = in6_dev_get(dev);
968 int err;
969
970 if (!idev)
971 return -ENODEV;
972
973 err = __ipv6_dev_mc_dec(idev, addr);
974
975 in6_dev_put(idev);
976
977 return err;
978}
979
980/*
981 * identify MLD packets for MLD filter exceptions
982 */
983int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
984{
985 struct icmp6hdr *pic;
986
987 if (nexthdr != IPPROTO_ICMPV6)
988 return 0;
989
990 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
991 return 0;
992
cc70ab26 993 pic = icmp6_hdr(skb);
1da177e4
LT		 994
995 switch (pic->icmp6_type) {
996 case ICMPV6_MGM_QUERY:
997 case ICMPV6_MGM_REPORT:
998 case ICMPV6_MGM_REDUCTION:
999 case ICMPV6_MLD2_REPORT:
1000 return 1;
1001 default:
1002 break;
1003 }
1004 return 0;
1005}
1006
1007/*
1008 * check if the interface/address pair is valid
1009 */
9acd9f3a
YH		 1010int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1011 const struct in6_addr *src_addr)
1da177e4
LT		 1012{
1013 struct inet6_dev *idev;
1014 struct ifmcaddr6 *mc;
1015 int rv = 0;
1016
1017 idev = in6_dev_get(dev);
1018 if (idev) {
1019 read_lock_bh(&idev->lock);
1020 for (mc = idev->mc_list; mc; mc=mc->next) {
1021 if (ipv6_addr_equal(&mc->mca_addr, group))
1022 break;
1023 }
1024 if (mc) {
1025 if (src_addr && !ipv6_addr_any(src_addr)) {
1026 struct ip6_sf_list *psf;
1027
1028 spin_lock_bh(&mc->mca_lock);
1029 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1030 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1031 break;
1032 }
1033 if (psf)
1034 rv = psf->sf_count[MCAST_INCLUDE] ||
1035 psf->sf_count[MCAST_EXCLUDE] !=
1036 mc->mca_sfcount[MCAST_EXCLUDE];
1037 else
1038 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1039 spin_unlock_bh(&mc->mca_lock);
1040 } else
1041 rv = 1; /* don't filter unspecified source */
1042 }
1043 read_unlock_bh(&idev->lock);
1044 in6_dev_put(idev);
1045 }
1046 return rv;
1047}
1048
1049static void mld_gq_start_timer(struct inet6_dev *idev)
1050{
1051 int tv = net_random() % idev->mc_maxdelay;
1052
1053 idev->mc_gq_running = 1;
1054 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1055 in6_dev_hold(idev);
1056}
1057
1058static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1059{
1060 int tv = net_random() % delay;
1061
1062 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1063 in6_dev_hold(idev);
1064}
1065
1066/*
1067 * IGMP handling (alias multicast ICMPv6 messages)
1068 */
1069
1070static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1071{
1072 unsigned long delay = resptime;
1073
1074 /* Do not start timer for these addresses */
1075 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1076 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1077 return;
1078
1079 if (del_timer(&ma->mca_timer)) {
1080 atomic_dec(&ma->mca_refcnt);
1081 delay = ma->mca_timer.expires - jiffies;
1082 }
1083
1084 if (delay >= resptime) {
1085 if (resptime)
1086 delay = net_random() % resptime;
1087 else
1088 delay = 1;
1089 }
1090 ma->mca_timer.expires = jiffies + delay;
1091 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1092 atomic_inc(&ma->mca_refcnt);
1093 ma->mca_flags |= MAF_TIMER_RUNNING;
1094}
1095
5ab4a6c8
DS		 1096/* mark EXCLUDE-mode sources */
1097static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1da177e4
LT		 1098 struct in6_addr *srcs)
1099{
1100 struct ip6_sf_list *psf;
1101 int i, scount;
1102
1103 scount = 0;
1104 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1105 if (scount == nsrcs)
1106 break;
5ab4a6c8
DS		 1107 for (i=0; i<nsrcs; i++) {
1108 /* skip inactive filters */
1109 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1110 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1111 psf->sf_count[MCAST_EXCLUDE])
1112 continue;
1113 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1114 scount++;
1115 break;
1116 }
1117 }
1118 }
1119 pmc->mca_flags &= ~MAF_GSQUERY;
1120 if (scount == nsrcs) /* all sources excluded */
1121 return 0;
1122 return 1;
1123}
1124
1125static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1126 struct in6_addr *srcs)
1127{
1128 struct ip6_sf_list *psf;
1129 int i, scount;
1130
1131 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1132 return mld_xmarksources(pmc, nsrcs, srcs);
1133
1134 /* mark INCLUDE-mode sources */
1135
1136 scount = 0;
1137 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1138 if (scount == nsrcs)
1139 break;
1140 for (i=0; i<nsrcs; i++) {
1da177e4
LT		 1141 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1142 psf->sf_gsresp = 1;
1143 scount++;
1144 break;
1145 }
5ab4a6c8
DS		 1146 }
1147 }
1148 if (!scount) {
1149 pmc->mca_flags &= ~MAF_GSQUERY;
1150 return 0;
1da177e4 1151 }
5ab4a6c8
DS		 1152 pmc->mca_flags |= MAF_GSQUERY;
1153 return 1;
1da177e4
LT		 1154}
1155
1156int igmp6_event_query(struct sk_buff *skb)
1157{
97300b5f 1158 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1159 struct ifmcaddr6 *ma;
1160 struct in6_addr *group;
1161 unsigned long max_delay;
1162 struct inet6_dev *idev;
1163 struct icmp6hdr *hdr;
1164 int group_type;
1165 int mark = 0;
1166 int len;
1167
1168 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1169 return -EINVAL;
1170
1171 /* compute payload length excluding extension headers */
0660e03f 1172 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
cfe1fc77 1173 len -= skb_network_header_len(skb);
1da177e4
LT		 1174
1175 /* Drop queries with not link local source */
0660e03f 1176 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1da177e4
LT		 1177 return -EINVAL;
1178
1179 idev = in6_dev_get(skb->dev);
1180
1181 if (idev == NULL)
1182 return 0;
1183
cc70ab26 1184 hdr = icmp6_hdr(skb);
1da177e4
LT		 1185 group = (struct in6_addr *) (hdr + 1);
1186 group_type = ipv6_addr_type(group);
1187
1188 if (group_type != IPV6_ADDR_ANY &&
1189 !(group_type&IPV6_ADDR_MULTICAST)) {
1190 in6_dev_put(idev);
1191 return -EINVAL;
1192 }
1193
1194 if (len == 24) {
1195 int switchback;
1196 /* MLDv1 router present */
1197
1198 /* Translate milliseconds to jiffies */
1199 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1200
1201 switchback = (idev->mc_qrv + 1) * max_delay;
1202 idev->mc_v1_seen = jiffies + switchback;
1203
1204 /* cancel the interface change timer */
1205 idev->mc_ifc_count = 0;
1206 if (del_timer(&idev->mc_ifc_timer))
1207 __in6_dev_put(idev);
1208 /* clear deleted report items */
1209 mld_clear_delrec(idev);
1210 } else if (len >= 28) {
1ab1457c 1211 int srcs_offset = sizeof(struct mld2_query) -
97300b5f
YZ		 1212 sizeof(struct icmp6hdr);
1213 if (!pskb_may_pull(skb, srcs_offset)) {
1214 in6_dev_put(idev);
1215 return -EINVAL;
1216 }
9c70220b 1217 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1da177e4
LT		 1218 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1219 if (!max_delay)
1220 max_delay = 1;
1221 idev->mc_maxdelay = max_delay;
1222 if (mlh2->qrv)
1223 idev->mc_qrv = mlh2->qrv;
1224 if (group_type == IPV6_ADDR_ANY) { /* general query */
1225 if (mlh2->nsrcs) {
1226 in6_dev_put(idev);
1227 return -EINVAL; /* no sources allowed */
1228 }
1229 mld_gq_start_timer(idev);
1230 in6_dev_put(idev);
1231 return 0;
1232 }
1233 /* mark sources to include, if group & source-specific */
97300b5f 1234 if (mlh2->nsrcs != 0) {
1ab1457c 1235 if (!pskb_may_pull(skb, srcs_offset +
5ab4a6c8 1236 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
97300b5f
YZ		 1237 in6_dev_put(idev);
1238 return -EINVAL;
1239 }
9c70220b 1240 mlh2 = (struct mld2_query *)skb_transport_header(skb);
97300b5f
YZ		 1241 mark = 1;
1242 }
1da177e4
LT		 1243 } else {
1244 in6_dev_put(idev);
1245 return -EINVAL;
1246 }
1247
1248 read_lock_bh(&idev->lock);
1249 if (group_type == IPV6_ADDR_ANY) {
1250 for (ma = idev->mc_list; ma; ma=ma->next) {
1251 spin_lock_bh(&ma->mca_lock);
1252 igmp6_group_queried(ma, max_delay);
1253 spin_unlock_bh(&ma->mca_lock);
1254 }
1255 } else {
1256 for (ma = idev->mc_list; ma; ma=ma->next) {
7add2a43 1257 if (!ipv6_addr_equal(group, &ma->mca_addr))
1da177e4
LT		 1258 continue;
1259 spin_lock_bh(&ma->mca_lock);
1260 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1261 /* gsquery <- gsquery && mark */
1262 if (!mark)
1263 ma->mca_flags &= ~MAF_GSQUERY;
1264 } else {
1265 /* gsquery <- mark */
1266 if (mark)
1267 ma->mca_flags |= MAF_GSQUERY;
1268 else
1269 ma->mca_flags &= ~MAF_GSQUERY;
1270 }
5ab4a6c8 1271 if (!(ma->mca_flags & MAF_GSQUERY) ||
7add2a43 1272 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
5ab4a6c8 1273 igmp6_group_queried(ma, max_delay);
1da177e4 1274 spin_unlock_bh(&ma->mca_lock);
7add2a43 1275 break;
1da177e4
LT		 1276 }
1277 }
1278 read_unlock_bh(&idev->lock);
1279 in6_dev_put(idev);
1280
1281 return 0;
1282}
1283
1284
1285int igmp6_event_report(struct sk_buff *skb)
1286{
1287 struct ifmcaddr6 *ma;
1288 struct in6_addr *addrp;
1289 struct inet6_dev *idev;
1290 struct icmp6hdr *hdr;
1291 int addr_type;
1292
1293 /* Our own report looped back. Ignore it. */
1294 if (skb->pkt_type == PACKET_LOOPBACK)
1295 return 0;
1296
24c69275
DS		 1297 /* send our report if the MC router may not have heard this report */
1298 if (skb->pkt_type != PACKET_MULTICAST &&
1299 skb->pkt_type != PACKET_BROADCAST)
1300 return 0;
1301
1da177e4
LT		 1302 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1303 return -EINVAL;
1304
cc70ab26 1305 hdr = icmp6_hdr(skb);
1da177e4
LT		 1306
1307 /* Drop reports with not link local source */
0660e03f 1308 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1ab1457c 1309 if (addr_type != IPV6_ADDR_ANY &&
1da177e4
LT		 1310 !(addr_type&IPV6_ADDR_LINKLOCAL))
1311 return -EINVAL;
1312
1313 addrp = (struct in6_addr *) (hdr + 1);
1314
1315 idev = in6_dev_get(skb->dev);
1316 if (idev == NULL)
1317 return -ENODEV;
1318
1319 /*
1320 * Cancel the timer for this group
1321 */
1322
1323 read_lock_bh(&idev->lock);
1324 for (ma = idev->mc_list; ma; ma=ma->next) {
1325 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1326 spin_lock(&ma->mca_lock);
1327 if (del_timer(&ma->mca_timer))
1328 atomic_dec(&ma->mca_refcnt);
1329 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1330 spin_unlock(&ma->mca_lock);
1331 break;
1332 }
1333 }
1334 read_unlock_bh(&idev->lock);
1335 in6_dev_put(idev);
1336 return 0;
1337}
1338
1339static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1340 int gdeleted, int sdeleted)
1341{
1342 switch (type) {
1343 case MLD2_MODE_IS_INCLUDE:
1344 case MLD2_MODE_IS_EXCLUDE:
1345 if (gdeleted || sdeleted)
1346 return 0;
5ab4a6c8
DS		 1347 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1348 if (pmc->mca_sfmode == MCAST_INCLUDE)
1349 return 1;
1350 /* don't include if this source is excluded
1351 * in all filters
1352 */
1353 if (psf->sf_count[MCAST_INCLUDE])
7add2a43 1354 return type == MLD2_MODE_IS_INCLUDE;
5ab4a6c8
DS		 1355 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1356 psf->sf_count[MCAST_EXCLUDE];
1357 }
1358 return 0;
1da177e4
LT		 1359 case MLD2_CHANGE_TO_INCLUDE:
1360 if (gdeleted || sdeleted)
1361 return 0;
1362 return psf->sf_count[MCAST_INCLUDE] != 0;
1363 case MLD2_CHANGE_TO_EXCLUDE:
1364 if (gdeleted || sdeleted)
1365 return 0;
1366 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1367 psf->sf_count[MCAST_INCLUDE])
1368 return 0;
1369 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1370 psf->sf_count[MCAST_EXCLUDE];
1371 case MLD2_ALLOW_NEW_SOURCES:
1372 if (gdeleted || !psf->sf_crcount)
1373 return 0;
1374 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1375 case MLD2_BLOCK_OLD_SOURCES:
1376 if (pmc->mca_sfmode == MCAST_INCLUDE)
1377 return gdeleted || (psf->sf_crcount && sdeleted);
1378 return psf->sf_crcount && !gdeleted && !sdeleted;
1379 }
1380 return 0;
1381}
1382
1383static int
1384mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1385{
1386 struct ip6_sf_list *psf;
1387 int scount = 0;
1388
1389 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1390 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1391 continue;
1392 scount++;
1393 }
1394 return scount;
1395}
1396
1397static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1398{
c346dca1 1399 struct net *net = dev_net(dev);
b8ad0cbc 1400 struct sock *sk = net->ipv6.igmp_sk;
1da177e4
LT		 1401 struct sk_buff *skb;
1402 struct mld2_report *pmr;
1403 struct in6_addr addr_buf;
d7aabf22 1404 const struct in6_addr *saddr;
1da177e4
LT		 1405 int err;
1406 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1407 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1408 IPV6_TLV_PADN, 0 };
1409
1410 /* we assume size > sizeof(ra) here */
f5184d26 1411 skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);
1da177e4 1412
cfcabdcc 1413 if (!skb)
1da177e4
LT		 1414 return NULL;
1415
1416 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1417
95c385b4 1418 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1419 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1420 * use unspecified address as the source address
1da177e4
LT		 1421 * when a valid link-local address is not available.
1422 */
d7aabf22
YH		 1423 saddr = &in6addr_any;
1424 } else
1425 saddr = &addr_buf;
1da177e4 1426
d7aabf22 1427 ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1da177e4
LT		 1428
1429 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1430
27a884dc 1431 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
d10ba34b
ACM		 1432 skb_put(skb, sizeof(*pmr));
1433 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1434 pmr->type = ICMPV6_MLD2_REPORT;
1435 pmr->resv1 = 0;
1436 pmr->csum = 0;
1437 pmr->resv2 = 0;
1438 pmr->ngrec = 0;
1439 return skb;
1440}
1441
1442static void mld_sendpack(struct sk_buff *skb)
1443{
0660e03f 1444 struct ipv6hdr *pip6 = ipv6_hdr(skb);
9c70220b
ACM		 1445 struct mld2_report *pmr =
1446 (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1447 int payload_len, mldlen;
1448 struct inet6_dev *idev = in6_dev_get(skb->dev);
c346dca1 1449 struct net *net = dev_net(skb->dev);
1da177e4 1450 int err;
41927178 1451 struct flowi fl;
adf30907 1452 struct dst_entry *dst;
1da177e4 1453
edf391ff
NH		 1454 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1455
27a884dc
ACM		 1456 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1457 mldlen = skb->tail - skb->transport_header;
1da177e4
LT		 1458 pip6->payload_len = htons(payload_len);
1459
1460 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
9c70220b
ACM		 1461 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1462 mldlen, 0));
41927178 1463
adf30907 1464 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
41927178 1465
adf30907 1466 if (!dst) {
41927178
YH		 1467 err = -ENOMEM;
1468 goto err_out;
1469 }
1470
b8ad0cbc 1471 icmpv6_flow_init(net->ipv6.igmp_sk, &fl, ICMPV6_MLD2_REPORT,
41927178
YH		 1472 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1473 skb->dev->ifindex);
1474
adf30907
ED		 1475 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
1476 skb_dst_set(skb, dst);
41927178
YH		 1477 if (err)
1478 goto err_out;
1479
edf391ff
NH		 1480 payload_len = skb->len;
1481
6e23ae2a 1482 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1483 dst_output);
1484out:
1da177e4 1485 if (!err) {
5a57d4c7 1486 ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
e41b5368 1487 ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1488 IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1da177e4 1489 } else
483a47d2 1490 IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1491
1492 if (likely(idev != NULL))
1493 in6_dev_put(idev);
41927178
YH		 1494 return;
1495
1496err_out:
1497 kfree_skb(skb);
1498 goto out;
1da177e4
LT		 1499}
1500
1501static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1502{
fab10fe3 1503 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1504}
1505
1506static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1507 int type, struct mld2_grec **ppgr)
1508{
1509 struct net_device *dev = pmc->idev->dev;
1510 struct mld2_report *pmr;
1511 struct mld2_grec *pgr;
1512
1513 if (!skb)
1514 skb = mld_newpack(dev, dev->mtu);
1515 if (!skb)
1516 return NULL;
1517 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1518 pgr->grec_type = type;
1519 pgr->grec_auxwords = 0;
1520 pgr->grec_nsrcs = 0;
1521 pgr->grec_mca = pmc->mca_addr; /* structure copy */
9c70220b 1522 pmr = (struct mld2_report *)skb_transport_header(skb);
1da177e4
LT		 1523 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1524 *ppgr = pgr;
1525 return skb;
1526}
1527
1528#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1529 skb_tailroom(skb)) : 0)
1530
1531static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1532 int type, int gdeleted, int sdeleted)
1533{
1534 struct net_device *dev = pmc->idev->dev;
1535 struct mld2_report *pmr;
1536 struct mld2_grec *pgr = NULL;
1537 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
5ab4a6c8 1538 int scount, stotal, first, isquery, truncate;
1da177e4
LT		 1539
1540 if (pmc->mca_flags & MAF_NOREPORT)
1541 return skb;
1542
1543 isquery = type == MLD2_MODE_IS_INCLUDE ||
1544 type == MLD2_MODE_IS_EXCLUDE;
1545 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1546 type == MLD2_CHANGE_TO_EXCLUDE;
1547
5ab4a6c8
DS		 1548 stotal = scount = 0;
1549
1da177e4
LT		 1550 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1551
5ab4a6c8
DS		 1552 if (!*psf_list)
1553 goto empty_source;
1554
9c70220b 1555 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1da177e4
LT		 1556
1557 /* EX and TO_EX get a fresh packet, if needed */
1558 if (truncate) {
1559 if (pmr && pmr->ngrec &&
1560 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1561 if (skb)
1562 mld_sendpack(skb);
1563 skb = mld_newpack(dev, dev->mtu);
1564 }
1565 }
1566 first = 1;
1da177e4
LT		 1567 psf_prev = NULL;
1568 for (psf=*psf_list; psf; psf=psf_next) {
1569 struct in6_addr *psrc;
1570
1571 psf_next = psf->sf_next;
1572
1573 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1574 psf_prev = psf;
1575 continue;
1576 }
1577
1578 /* clear marks on query responses */
1579 if (isquery)
1580 psf->sf_gsresp = 0;
1581
1582 if (AVAILABLE(skb) < sizeof(*psrc) +
1583 first*sizeof(struct mld2_grec)) {
1584 if (truncate && !first)
1585 break; /* truncate these */
1586 if (pgr)
1587 pgr->grec_nsrcs = htons(scount);
1588 if (skb)
1589 mld_sendpack(skb);
1590 skb = mld_newpack(dev, dev->mtu);
1591 first = 1;
1592 scount = 0;
1593 }
1594 if (first) {
1595 skb = add_grhead(skb, pmc, type, &pgr);
1596 first = 0;
1597 }
cc63f70b
AD		 1598 if (!skb)
1599 return NULL;
1da177e4
LT		 1600 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1601 *psrc = psf->sf_addr;
5ab4a6c8 1602 scount++; stotal++;
1da177e4
LT		 1603 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1604 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1605 psf->sf_crcount--;
1606 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1607 if (psf_prev)
1608 psf_prev->sf_next = psf->sf_next;
1609 else
1610 *psf_list = psf->sf_next;
1611 kfree(psf);
1612 continue;
1613 }
1614 }
1615 psf_prev = psf;
1616 }
5ab4a6c8
DS		 1617
1618empty_source:
1619 if (!stotal) {
1620 if (type == MLD2_ALLOW_NEW_SOURCES ||
1621 type == MLD2_BLOCK_OLD_SOURCES)
1622 return skb;
1623 if (pmc->mca_crcount || isquery) {
1624 /* make sure we have room for group header */
1625 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1626 mld_sendpack(skb);
1627 skb = NULL; /* add_grhead will get a new one */
1628 }
1629 skb = add_grhead(skb, pmc, type, &pgr);
1630 }
1631 }
1da177e4
LT		 1632 if (pgr)
1633 pgr->grec_nsrcs = htons(scount);
1634
1635 if (isquery)
1636 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1637 return skb;
1638}
1639
1640static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1641{
1642 struct sk_buff *skb = NULL;
1643 int type;
1644
1645 if (!pmc) {
1646 read_lock_bh(&idev->lock);
1647 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1648 if (pmc->mca_flags & MAF_NOREPORT)
1649 continue;
1650 spin_lock_bh(&pmc->mca_lock);
1651 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1652 type = MLD2_MODE_IS_EXCLUDE;
1653 else
1654 type = MLD2_MODE_IS_INCLUDE;
1655 skb = add_grec(skb, pmc, type, 0, 0);
1656 spin_unlock_bh(&pmc->mca_lock);
1657 }
1658 read_unlock_bh(&idev->lock);
1659 } else {
1660 spin_lock_bh(&pmc->mca_lock);
1661 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1662 type = MLD2_MODE_IS_EXCLUDE;
1663 else
1664 type = MLD2_MODE_IS_INCLUDE;
1665 skb = add_grec(skb, pmc, type, 0, 0);
1666 spin_unlock_bh(&pmc->mca_lock);
1667 }
1668 if (skb)
1669 mld_sendpack(skb);
1670}
1671
1672/*
1673 * remove zero-count source records from a source filter list
1674 */
1675static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1676{
1677 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1678
1679 psf_prev = NULL;
1680 for (psf=*ppsf; psf; psf = psf_next) {
1681 psf_next = psf->sf_next;
1682 if (psf->sf_crcount == 0) {
1683 if (psf_prev)
1684 psf_prev->sf_next = psf->sf_next;
1685 else
1686 *ppsf = psf->sf_next;
1687 kfree(psf);
1688 } else
1689 psf_prev = psf;
1690 }
1691}
1692
1693static void mld_send_cr(struct inet6_dev *idev)
1694{
1695 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1696 struct sk_buff *skb = NULL;
1697 int type, dtype;
1698
1699 read_lock_bh(&idev->lock);
6457d26b 1700 spin_lock(&idev->mc_lock);
1da177e4
LT		 1701
1702 /* deleted MCA's */
1703 pmc_prev = NULL;
1704 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1705 pmc_next = pmc->next;
1706 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1707 type = MLD2_BLOCK_OLD_SOURCES;
1708 dtype = MLD2_BLOCK_OLD_SOURCES;
1709 skb = add_grec(skb, pmc, type, 1, 0);
1710 skb = add_grec(skb, pmc, dtype, 1, 1);
1711 }
1712 if (pmc->mca_crcount) {
1da177e4
LT		 1713 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1714 type = MLD2_CHANGE_TO_INCLUDE;
1715 skb = add_grec(skb, pmc, type, 1, 0);
1716 }
5ab4a6c8 1717 pmc->mca_crcount--;
1da177e4
LT		 1718 if (pmc->mca_crcount == 0) {
1719 mld_clear_zeros(&pmc->mca_tomb);
1720 mld_clear_zeros(&pmc->mca_sources);
1721 }
1722 }
1723 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1724 !pmc->mca_sources) {
1725 if (pmc_prev)
1726 pmc_prev->next = pmc_next;
1727 else
1728 idev->mc_tomb = pmc_next;
1729 in6_dev_put(pmc->idev);
1730 kfree(pmc);
1731 } else
1732 pmc_prev = pmc;
1733 }
6457d26b 1734 spin_unlock(&idev->mc_lock);
1da177e4
LT		 1735
1736 /* change recs */
1737 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1738 spin_lock_bh(&pmc->mca_lock);
1739 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1740 type = MLD2_BLOCK_OLD_SOURCES;
1741 dtype = MLD2_ALLOW_NEW_SOURCES;
1742 } else {
1743 type = MLD2_ALLOW_NEW_SOURCES;
1744 dtype = MLD2_BLOCK_OLD_SOURCES;
1745 }
1746 skb = add_grec(skb, pmc, type, 0, 0);
1747 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1748
1749 /* filter mode changes */
1750 if (pmc->mca_crcount) {
1da177e4
LT		 1751 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1752 type = MLD2_CHANGE_TO_EXCLUDE;
1753 else
1754 type = MLD2_CHANGE_TO_INCLUDE;
1755 skb = add_grec(skb, pmc, type, 0, 0);
5ab4a6c8 1756 pmc->mca_crcount--;
1da177e4
LT		 1757 }
1758 spin_unlock_bh(&pmc->mca_lock);
1759 }
1760 read_unlock_bh(&idev->lock);
1761 if (!skb)
1762 return;
1763 (void) mld_sendpack(skb);
1764}
1765
1766static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1767{
c346dca1 1768 struct net *net = dev_net(dev);
b8ad0cbc 1769 struct sock *sk = net->ipv6.igmp_sk;
1da177e4 1770 struct inet6_dev *idev;
1ab1457c
YH		 1771 struct sk_buff *skb;
1772 struct icmp6hdr *hdr;
d7aabf22 1773 const struct in6_addr *snd_addr, *saddr;
1da177e4
LT		 1774 struct in6_addr *addrp;
1775 struct in6_addr addr_buf;
1da177e4
LT		 1776 int err, len, payload_len, full_len;
1777 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1778 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1779 IPV6_TLV_PADN, 0 };
41927178 1780 struct flowi fl;
adf30907 1781 struct dst_entry *dst;
1da177e4 1782
f3ee4010
YH		 1783 if (type == ICMPV6_MGM_REDUCTION)
1784 snd_addr = &in6addr_linklocal_allrouters;
1785 else
1786 snd_addr = addr;
1da177e4
LT		 1787
1788 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1789 payload_len = len + sizeof(ra);
1790 full_len = sizeof(struct ipv6hdr) + payload_len;
1791
edf391ff
NH		 1792 rcu_read_lock();
1793 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1794 IPSTATS_MIB_OUT, full_len);
1795 rcu_read_unlock();
1796
f5184d26 1797 skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1da177e4
LT		 1798
1799 if (skb == NULL) {
a11d206d 1800 rcu_read_lock();
3bd653c8 1801 IP6_INC_STATS(net, __in6_dev_get(dev),
a11d206d
YH		 1802 IPSTATS_MIB_OUTDISCARDS);
1803 rcu_read_unlock();
1da177e4
LT		 1804 return;
1805 }
1806
1807 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4 1808
95c385b4 1809 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1da177e4 1810 /* <draft-ietf-magma-mld-source-05.txt>:
1ab1457c 1811 * use unspecified address as the source address
1da177e4
LT		 1812 * when a valid link-local address is not available.
1813 */
d7aabf22
YH		 1814 saddr = &in6addr_any;
1815 } else
1816 saddr = &addr_buf;
1da177e4 1817
d7aabf22 1818 ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1da177e4
LT		 1819
1820 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1821
1822 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1823 memset(hdr, 0, sizeof(struct icmp6hdr));
1824 hdr->icmp6_type = type;
1825
1826 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1827 ipv6_addr_copy(addrp, addr);
1828
d7aabf22 1829 hdr->icmp6_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1da177e4 1830 IPPROTO_ICMPV6,
07f0757a 1831 csum_partial(hdr, len, 0));
1da177e4
LT		 1832
1833 idev = in6_dev_get(skb->dev);
1834
adf30907
ED		 1835 dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1836 if (!dst) {
41927178
YH		 1837 err = -ENOMEM;
1838 goto err_out;
1839 }
1840
b8ad0cbc 1841 icmpv6_flow_init(sk, &fl, type,
41927178
YH		 1842 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1843 skb->dev->ifindex);
1844
adf30907 1845 err = xfrm_lookup(net, &dst, &fl, NULL, 0);
41927178
YH		 1846 if (err)
1847 goto err_out;
1848
adf30907 1849 skb_dst_set(skb, dst);
6e23ae2a 1850 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
41927178
YH		 1851 dst_output);
1852out:
1da177e4 1853 if (!err) {
5c5d244b 1854 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 1855 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
edf391ff 1856 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1da177e4 1857 } else
3bd653c8 1858 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1da177e4
LT		 1859
1860 if (likely(idev != NULL))
1861 in6_dev_put(idev);
1862 return;
41927178
YH		 1863
1864err_out:
1865 kfree_skb(skb);
1866 goto out;
1da177e4
LT		 1867}
1868
1869static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1870 struct in6_addr *psfsrc)
1871{
1872 struct ip6_sf_list *psf, *psf_prev;
1873 int rv = 0;
1874
1875 psf_prev = NULL;
1876 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1877 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1878 break;
1879 psf_prev = psf;
1880 }
1881 if (!psf || psf->sf_count[sfmode] == 0) {
1882 /* source filter not found, or count wrong => bug */
1883 return -ESRCH;
1884 }
1885 psf->sf_count[sfmode]--;
1886 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1887 struct inet6_dev *idev = pmc->idev;
1888
1889 /* no more filters for this source */
1890 if (psf_prev)
1891 psf_prev->sf_next = psf->sf_next;
1892 else
1893 pmc->mca_sources = psf->sf_next;
1894 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1895 !MLD_V1_SEEN(idev)) {
1896 psf->sf_crcount = idev->mc_qrv;
1897 psf->sf_next = pmc->mca_tomb;
1898 pmc->mca_tomb = psf;
1899 rv = 1;
1900 } else
1901 kfree(psf);
1902 }
1903 return rv;
1904}
1905
1906static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1907 int sfmode, int sfcount, struct in6_addr *psfsrc,
1908 int delta)
1909{
1910 struct ifmcaddr6 *pmc;
1911 int changerec = 0;
1912 int i, err;
1913
1914 if (!idev)
1915 return -ENODEV;
1916 read_lock_bh(&idev->lock);
1917 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1918 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1919 break;
1920 }
1921 if (!pmc) {
1922 /* MCA not found?? bug */
1923 read_unlock_bh(&idev->lock);
1924 return -ESRCH;
1925 }
1926 spin_lock_bh(&pmc->mca_lock);
1927 sf_markstate(pmc);
1928 if (!delta) {
1929 if (!pmc->mca_sfcount[sfmode]) {
1930 spin_unlock_bh(&pmc->mca_lock);
1931 read_unlock_bh(&idev->lock);
1932 return -EINVAL;
1933 }
1934 pmc->mca_sfcount[sfmode]--;
1935 }
1936 err = 0;
1937 for (i=0; i<sfcount; i++) {
1938 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1939
1940 changerec |= rv > 0;
1941 if (!err && rv < 0)
1942 err = rv;
1943 }
1944 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1945 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1946 pmc->mca_sfcount[MCAST_INCLUDE]) {
1947 struct ip6_sf_list *psf;
1948
1949 /* filter mode change */
1950 pmc->mca_sfmode = MCAST_INCLUDE;
1951 pmc->mca_crcount = idev->mc_qrv;
1952 idev->mc_ifc_count = pmc->mca_crcount;
1953 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1954 psf->sf_crcount = 0;
1955 mld_ifc_event(pmc->idev);
1956 } else if (sf_setstate(pmc) || changerec)
1957 mld_ifc_event(pmc->idev);
1958 spin_unlock_bh(&pmc->mca_lock);
1959 read_unlock_bh(&idev->lock);
1960 return err;
1961}
1962
1963/*
1964 * Add multicast single-source filter to the interface list
1965 */
1966static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1967 struct in6_addr *psfsrc, int delta)
1968{
1969 struct ip6_sf_list *psf, *psf_prev;
1970
1971 psf_prev = NULL;
1972 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1973 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1974 break;
1975 psf_prev = psf;
1976 }
1977 if (!psf) {
0c600eda 1978 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1da177e4
LT		 1979 if (!psf)
1980 return -ENOBUFS;
0c600eda 1981
1da177e4
LT		 1982 psf->sf_addr = *psfsrc;
1983 if (psf_prev) {
1984 psf_prev->sf_next = psf;
1985 } else
1986 pmc->mca_sources = psf;
1987 }
1988 psf->sf_count[sfmode]++;
1989 return 0;
1990}
1991
1992static void sf_markstate(struct ifmcaddr6 *pmc)
1993{
1994 struct ip6_sf_list *psf;
1995 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1996
1997 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1998 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1999 psf->sf_oldin = mca_xcount ==
2000 psf->sf_count[MCAST_EXCLUDE] &&
2001 !psf->sf_count[MCAST_INCLUDE];
2002 } else
2003 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2004}
2005
2006static int sf_setstate(struct ifmcaddr6 *pmc)
2007{
7add2a43 2008 struct ip6_sf_list *psf, *dpsf;
1da177e4
LT		 2009 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2010 int qrv = pmc->idev->mc_qrv;
2011 int new_in, rv;
2012
2013 rv = 0;
2014 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
2015 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2016 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2017 !psf->sf_count[MCAST_INCLUDE];
2018 } else
2019 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
7add2a43
DS		 2020 if (new_in) {
2021 if (!psf->sf_oldin) {
e80e28b6 2022 struct ip6_sf_list *prev = NULL;
7add2a43
DS		 2023
2024 for (dpsf=pmc->mca_tomb; dpsf;
2025 dpsf=dpsf->sf_next) {
2026 if (ipv6_addr_equal(&dpsf->sf_addr,
2027 &psf->sf_addr))
2028 break;
2029 prev = dpsf;
2030 }
2031 if (dpsf) {
2032 if (prev)
2033 prev->sf_next = dpsf->sf_next;
2034 else
2035 pmc->mca_tomb = dpsf->sf_next;
2036 kfree(dpsf);
2037 }
2038 psf->sf_crcount = qrv;
2039 rv++;
2040 }
2041 } else if (psf->sf_oldin) {
2042 psf->sf_crcount = 0;
2043 /*
2044 * add or update "delete" records if an active filter
2045 * is now inactive
2046 */
2047 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2048 if (ipv6_addr_equal(&dpsf->sf_addr,
2049 &psf->sf_addr))
2050 break;
2051 if (!dpsf) {
2052 dpsf = (struct ip6_sf_list *)
2053 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2054 if (!dpsf)
2055 continue;
2056 *dpsf = *psf;
2057 /* pmc->mca_lock held by callers */
2058 dpsf->sf_next = pmc->mca_tomb;
2059 pmc->mca_tomb = dpsf;
2060 }
2061 dpsf->sf_crcount = qrv;
1da177e4
LT		 2062 rv++;
2063 }
2064 }
2065 return rv;
2066}
2067
2068/*
2069 * Add multicast source filter list to the interface list
2070 */
2071static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2072 int sfmode, int sfcount, struct in6_addr *psfsrc,
2073 int delta)
2074{
2075 struct ifmcaddr6 *pmc;
2076 int isexclude;
2077 int i, err;
2078
2079 if (!idev)
2080 return -ENODEV;
2081 read_lock_bh(&idev->lock);
2082 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2083 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2084 break;
2085 }
2086 if (!pmc) {
2087 /* MCA not found?? bug */
2088 read_unlock_bh(&idev->lock);
2089 return -ESRCH;
2090 }
2091 spin_lock_bh(&pmc->mca_lock);
2092
2093 sf_markstate(pmc);
2094 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2095 if (!delta)
2096 pmc->mca_sfcount[sfmode]++;
2097 err = 0;
2098 for (i=0; i<sfcount; i++) {
2099 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2100 if (err)
2101 break;
2102 }
2103 if (err) {
2104 int j;
2105
2106 if (!delta)
2107 pmc->mca_sfcount[sfmode]--;
2108 for (j=0; j<i; j++)
2109 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2110 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1da177e4
LT		 2111 struct ip6_sf_list *psf;
2112
2113 /* filter mode change */
2114 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2115 pmc->mca_sfmode = MCAST_EXCLUDE;
2116 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2117 pmc->mca_sfmode = MCAST_INCLUDE;
2118 /* else no filters; keep old mode for reports */
2119
2120 pmc->mca_crcount = idev->mc_qrv;
2121 idev->mc_ifc_count = pmc->mca_crcount;
2122 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2123 psf->sf_crcount = 0;
2124 mld_ifc_event(idev);
2125 } else if (sf_setstate(pmc))
2126 mld_ifc_event(idev);
2127 spin_unlock_bh(&pmc->mca_lock);
2128 read_unlock_bh(&idev->lock);
2129 return err;
2130}
2131
2132static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2133{
2134 struct ip6_sf_list *psf, *nextpsf;
2135
2136 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2137 nextpsf = psf->sf_next;
2138 kfree(psf);
2139 }
2140 pmc->mca_tomb = NULL;
2141 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2142 nextpsf = psf->sf_next;
2143 kfree(psf);
2144 }
2145 pmc->mca_sources = NULL;
2146 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 2147 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 2148 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2149}
2150
2151
2152static void igmp6_join_group(struct ifmcaddr6 *ma)
2153{
2154 unsigned long delay;
2155
2156 if (ma->mca_flags & MAF_NOREPORT)
2157 return;
2158
2159 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2160
2161 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2162
2163 spin_lock_bh(&ma->mca_lock);
2164 if (del_timer(&ma->mca_timer)) {
2165 atomic_dec(&ma->mca_refcnt);
2166 delay = ma->mca_timer.expires - jiffies;
2167 }
2168
2169 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2170 atomic_inc(&ma->mca_refcnt);
2171 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2172 spin_unlock_bh(&ma->mca_lock);
2173}
2174
2175static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2176 struct inet6_dev *idev)
2177{
2178 int err;
2179
5ab4a6c8
DS		 2180 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2181 * so no other readers or writers of iml or its sflist
2182 */
cfcabdcc 2183 if (!iml->sflist) {
1da177e4
LT		 2184 /* any-source empty exclude case */
2185 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2186 }
2187 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2188 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2189 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2190 iml->sflist = NULL;
2191 return err;
2192}
2193
2194static void igmp6_leave_group(struct ifmcaddr6 *ma)
2195{
2196 if (MLD_V1_SEEN(ma->idev)) {
2197 if (ma->mca_flags & MAF_LAST_REPORTER)
2198 igmp6_send(&ma->mca_addr, ma->idev->dev,
2199 ICMPV6_MGM_REDUCTION);
2200 } else {
2201 mld_add_delrec(ma->idev, ma);
2202 mld_ifc_event(ma->idev);
2203 }
2204}
2205
2206static void mld_gq_timer_expire(unsigned long data)
2207{
2208 struct inet6_dev *idev = (struct inet6_dev *)data;
2209
2210 idev->mc_gq_running = 0;
2211 mld_send_report(idev, NULL);
2212 __in6_dev_put(idev);
2213}
2214
2215static void mld_ifc_timer_expire(unsigned long data)
2216{
2217 struct inet6_dev *idev = (struct inet6_dev *)data;
2218
2219 mld_send_cr(idev);
2220 if (idev->mc_ifc_count) {
2221 idev->mc_ifc_count--;
2222 if (idev->mc_ifc_count)
2223 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2224 }
2225 __in6_dev_put(idev);
2226}
2227
2228static void mld_ifc_event(struct inet6_dev *idev)
2229{
2230 if (MLD_V1_SEEN(idev))
2231 return;
2232 idev->mc_ifc_count = idev->mc_qrv;
2233 mld_ifc_start_timer(idev, 1);
2234}
2235
2236
2237static void igmp6_timer_handler(unsigned long data)
2238{
2239 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2240
2241 if (MLD_V1_SEEN(ma->idev))
2242 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2243 else
2244 mld_send_report(ma->idev, ma);
2245
2246 spin_lock(&ma->mca_lock);
2247 ma->mca_flags |= MAF_LAST_REPORTER;
2248 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2249 spin_unlock(&ma->mca_lock);
2250 ma_put(ma);
2251}
2252
75c78500
MS		 2253/* Device changing type */
2254
2255void ipv6_mc_unmap(struct inet6_dev *idev)
2256{
2257 struct ifmcaddr6 *i;
2258
2259 /* Install multicast list, except for all-nodes (already installed) */
2260
2261 read_lock_bh(&idev->lock);
2262 for (i = idev->mc_list; i; i = i->next)
2263 igmp6_group_dropped(i);
2264 read_unlock_bh(&idev->lock);
2265}
2266
2267void ipv6_mc_remap(struct inet6_dev *idev)
2268{
2269 ipv6_mc_up(idev);
2270}
2271
1da177e4
LT		 2272/* Device going down */
2273
2274void ipv6_mc_down(struct inet6_dev *idev)
2275{
2276 struct ifmcaddr6 *i;
2277
2278 /* Withdraw multicast list */
2279
2280 read_lock_bh(&idev->lock);
2281 idev->mc_ifc_count = 0;
2282 if (del_timer(&idev->mc_ifc_timer))
2283 __in6_dev_put(idev);
2284 idev->mc_gq_running = 0;
2285 if (del_timer(&idev->mc_gq_timer))
2286 __in6_dev_put(idev);
2287
2288 for (i = idev->mc_list; i; i=i->next)
2289 igmp6_group_dropped(i);
2290 read_unlock_bh(&idev->lock);
2291
2292 mld_clear_delrec(idev);
2293}
2294
2295
2296/* Device going up */
2297
2298void ipv6_mc_up(struct inet6_dev *idev)
2299{
2300 struct ifmcaddr6 *i;
2301
2302 /* Install multicast list, except for all-nodes (already installed) */
2303
2304 read_lock_bh(&idev->lock);
2305 for (i = idev->mc_list; i; i=i->next)
2306 igmp6_group_added(i);
2307 read_unlock_bh(&idev->lock);
2308}
2309
2310/* IPv6 device initialization. */
2311
2312void ipv6_mc_init_dev(struct inet6_dev *idev)
2313{
1da177e4 2314 write_lock_bh(&idev->lock);
6457d26b 2315 spin_lock_init(&idev->mc_lock);
1da177e4 2316 idev->mc_gq_running = 0;
b24b8a24
PE		 2317 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2318 (unsigned long)idev);
1da177e4
LT		 2319 idev->mc_tomb = NULL;
2320 idev->mc_ifc_count = 0;
b24b8a24
PE		 2321 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2322 (unsigned long)idev);
1da177e4
LT		 2323 idev->mc_qrv = MLD_QRV_DEFAULT;
2324 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2325 idev->mc_v1_seen = 0;
2326 write_unlock_bh(&idev->lock);
1da177e4
LT		 2327}
2328
2329/*
2330 * Device is about to be destroyed: clean up.
2331 */
2332
2333void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2334{
2335 struct ifmcaddr6 *i;
1da177e4
LT		 2336
2337 /* Deactivate timers */
2338 ipv6_mc_down(idev);
2339
2340 /* Delete all-nodes address. */
1da177e4
LT		 2341 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2342 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2343 * fail.
2344 */
f3ee4010 2345 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
1da177e4 2346
f3ee4010
YH		 2347 if (idev->cnf.forwarding)
2348 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
1da177e4
LT		 2349
2350 write_lock_bh(&idev->lock);
2351 while ((i = idev->mc_list) != NULL) {
2352 idev->mc_list = i->next;
2353 write_unlock_bh(&idev->lock);
2354
2355 igmp6_group_dropped(i);
2356 ma_put(i);
2357
2358 write_lock_bh(&idev->lock);
2359 }
2360 write_unlock_bh(&idev->lock);
2361}
2362
2363#ifdef CONFIG_PROC_FS
2364struct igmp6_mc_iter_state {
b8ad0cbc 2365 struct seq_net_private p;
1da177e4
LT		 2366 struct net_device *dev;
2367 struct inet6_dev *idev;
2368};
2369
2370#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2371
2372static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2373{
2374 struct ifmcaddr6 *im = NULL;
2375 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
1218854a 2376 struct net *net = seq_file_net(seq);
1da177e4 2377
7562f876 2378 state->idev = NULL;
ce81b76a 2379 for_each_netdev_rcu(net, state->dev) {
1da177e4 2380 struct inet6_dev *idev;
ce81b76a 2381 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2382 if (!idev)
2383 continue;
2384 read_lock_bh(&idev->lock);
2385 im = idev->mc_list;
2386 if (im) {
2387 state->idev = idev;
2388 break;
2389 }
2390 read_unlock_bh(&idev->lock);
1da177e4
LT		 2391 }
2392 return im;
2393}
2394
2395static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2396{
2397 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2398
2399 im = im->next;
2400 while (!im) {
ce81b76a 2401 if (likely(state->idev != NULL))
1da177e4 2402 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2403
2404 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2405 if (!state->dev) {
2406 state->idev = NULL;
2407 break;
2408 }
ce81b76a 2409 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2410 if (!state->idev)
2411 continue;
2412 read_lock_bh(&state->idev->lock);
2413 im = state->idev->mc_list;
2414 }
2415 return im;
2416}
2417
2418static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2419{
2420 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2421 if (im)
2422 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2423 --pos;
2424 return pos ? NULL : im;
2425}
2426
2427static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2428 __acquires(RCU)
1da177e4 2429{
ce81b76a 2430 rcu_read_lock();
1da177e4
LT		 2431 return igmp6_mc_get_idx(seq, *pos);
2432}
2433
2434static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2435{
ce81b76a
ED		 2436 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2437
1da177e4
LT		 2438 ++*pos;
2439 return im;
2440}
2441
2442static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2443 __releases(RCU)
1da177e4
LT		 2444{
2445 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
ce81b76a 2446
1da177e4
LT		 2447 if (likely(state->idev != NULL)) {
2448 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2449 state->idev = NULL;
2450 }
2451 state->dev = NULL;
ce81b76a 2452 rcu_read_unlock();
1da177e4
LT		 2453}
2454
2455static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2456{
2457 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2458 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2459
2460 seq_printf(seq,
4b7a4274 2461 "%-4d %-15s %pi6 %5d %08X %ld\n",
1da177e4 2462 state->dev->ifindex, state->dev->name,
b071195d 2463 &im->mca_addr,
1da177e4
LT		 2464 im->mca_users, im->mca_flags,
2465 (im->mca_flags&MAF_TIMER_RUNNING) ?
2466 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2467 return 0;
2468}
2469
56b3d975 2470static const struct seq_operations igmp6_mc_seq_ops = {
1da177e4
LT		 2471 .start = igmp6_mc_seq_start,
2472 .next = igmp6_mc_seq_next,
2473 .stop = igmp6_mc_seq_stop,
2474 .show = igmp6_mc_seq_show,
2475};
2476
2477static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2478{
b8ad0cbc
DL		 2479 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2480 sizeof(struct igmp6_mc_iter_state));
1da177e4
LT		 2481}
2482
9a32144e 2483static const struct file_operations igmp6_mc_seq_fops = {
1da177e4
LT		 2484 .owner = THIS_MODULE,
2485 .open = igmp6_mc_seq_open,
2486 .read = seq_read,
2487 .llseek = seq_lseek,
b8ad0cbc 2488 .release = seq_release_net,
1da177e4
LT		 2489};
2490
2491struct igmp6_mcf_iter_state {
b8ad0cbc 2492 struct seq_net_private p;
1da177e4
LT		 2493 struct net_device *dev;
2494 struct inet6_dev *idev;
2495 struct ifmcaddr6 *im;
2496};
2497
2498#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2499
2500static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2501{
2502 struct ip6_sf_list *psf = NULL;
2503 struct ifmcaddr6 *im = NULL;
2504 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
1218854a 2505 struct net *net = seq_file_net(seq);
1da177e4 2506
7562f876
PE		 2507 state->idev = NULL;
2508 state->im = NULL;
ce81b76a 2509 for_each_netdev_rcu(net, state->dev) {
1da177e4 2510 struct inet6_dev *idev;
ce81b76a 2511 idev = __in6_dev_get(state->dev);
1da177e4
LT		 2512 if (unlikely(idev == NULL))
2513 continue;
2514 read_lock_bh(&idev->lock);
2515 im = idev->mc_list;
2516 if (likely(im != NULL)) {
2517 spin_lock_bh(&im->mca_lock);
2518 psf = im->mca_sources;
2519 if (likely(psf != NULL)) {
2520 state->im = im;
2521 state->idev = idev;
2522 break;
2523 }
2524 spin_unlock_bh(&im->mca_lock);
2525 }
2526 read_unlock_bh(&idev->lock);
1da177e4
LT		 2527 }
2528 return psf;
2529}
2530
2531static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2532{
2533 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2534
2535 psf = psf->sf_next;
2536 while (!psf) {
2537 spin_unlock_bh(&state->im->mca_lock);
2538 state->im = state->im->next;
2539 while (!state->im) {
ce81b76a 2540 if (likely(state->idev != NULL))
1da177e4 2541 read_unlock_bh(&state->idev->lock);
ce81b76a
ED		 2542
2543 state->dev = next_net_device_rcu(state->dev);
1da177e4
LT		 2544 if (!state->dev) {
2545 state->idev = NULL;
2546 goto out;
2547 }
ce81b76a 2548 state->idev = __in6_dev_get(state->dev);
1da177e4
LT		 2549 if (!state->idev)
2550 continue;
2551 read_lock_bh(&state->idev->lock);
2552 state->im = state->idev->mc_list;
2553 }
2554 if (!state->im)
2555 break;
2556 spin_lock_bh(&state->im->mca_lock);
2557 psf = state->im->mca_sources;
2558 }
2559out:
2560 return psf;
2561}
2562
2563static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2564{
2565 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2566 if (psf)
2567 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2568 --pos;
2569 return pos ? NULL : psf;
2570}
2571
2572static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
ce81b76a 2573 __acquires(RCU)
1da177e4 2574{
ce81b76a 2575 rcu_read_lock();
1da177e4
LT		 2576 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2577}
2578
2579static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2580{
2581 struct ip6_sf_list *psf;
2582 if (v == SEQ_START_TOKEN)
2583 psf = igmp6_mcf_get_first(seq);
2584 else
2585 psf = igmp6_mcf_get_next(seq, v);
2586 ++*pos;
2587 return psf;
2588}
2589
2590static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
ce81b76a 2591 __releases(RCU)
1da177e4
LT		 2592{
2593 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2594 if (likely(state->im != NULL)) {
2595 spin_unlock_bh(&state->im->mca_lock);
2596 state->im = NULL;
2597 }
2598 if (likely(state->idev != NULL)) {
2599 read_unlock_bh(&state->idev->lock);
1da177e4
LT		 2600 state->idev = NULL;
2601 }
2602 state->dev = NULL;
ce81b76a 2603 rcu_read_unlock();
1da177e4
LT		 2604}
2605
2606static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2607{
2608 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2609 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2610
2611 if (v == SEQ_START_TOKEN) {
1ab1457c 2612 seq_printf(seq,
1da177e4 2613 "%3s %6s "
9343e79a 2614 "%32s %32s %6s %6s\n", "Idx",
1da177e4
LT		 2615 "Device", "Multicast Address",
2616 "Source Address", "INC", "EXC");
2617 } else {
2618 seq_printf(seq,
4b7a4274 2619 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
1da177e4 2620 state->dev->ifindex, state->dev->name,
b071195d
HH		 2621 &state->im->mca_addr,
2622 &psf->sf_addr,
1da177e4
LT		 2623 psf->sf_count[MCAST_INCLUDE],
2624 psf->sf_count[MCAST_EXCLUDE]);
2625 }
2626 return 0;
2627}
2628
56b3d975 2629static const struct seq_operations igmp6_mcf_seq_ops = {
1da177e4
LT		 2630 .start = igmp6_mcf_seq_start,
2631 .next = igmp6_mcf_seq_next,
2632 .stop = igmp6_mcf_seq_stop,
2633 .show = igmp6_mcf_seq_show,
2634};
2635
2636static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2637{
b8ad0cbc
DL		 2638 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2639 sizeof(struct igmp6_mcf_iter_state));
1da177e4
LT		 2640}
2641
9a32144e 2642static const struct file_operations igmp6_mcf_seq_fops = {
1da177e4
LT		 2643 .owner = THIS_MODULE,
2644 .open = igmp6_mcf_seq_open,
2645 .read = seq_read,
2646 .llseek = seq_lseek,
b8ad0cbc 2647 .release = seq_release_net,
1da177e4 2648};
ea82edf7 2649
2c8c1e72 2650static int __net_init igmp6_proc_init(struct net *net)
ea82edf7
DL		 2651{
2652 int err;
2653
2654 err = -ENOMEM;
2655 if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2656 goto out;
2657 if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2658 &igmp6_mcf_seq_fops))
2659 goto out_proc_net_igmp6;
2660
2661 err = 0;
2662out:
2663 return err;
2664
2665out_proc_net_igmp6:
2666 proc_net_remove(net, "igmp6");
2667 goto out;
2668}
2669
2c8c1e72 2670static void __net_exit igmp6_proc_exit(struct net *net)
ea82edf7
DL		 2671{
2672 proc_net_remove(net, "mcfilter6");
2673 proc_net_remove(net, "igmp6");
2674}
2675#else
2c8c1e72 2676static inline int igmp6_proc_init(struct net *net)
ea82edf7
DL		 2677{
2678 return 0;
2679}
2c8c1e72 2680static inline void igmp6_proc_exit(struct net *net)
ea82edf7 2681{
ea82edf7 2682}
1da177e4
LT		 2683#endif
2684
2c8c1e72 2685static int __net_init igmp6_net_init(struct net *net)
1da177e4 2686{
1da177e4
LT		 2687 int err;
2688
1ed8516f
DL		 2689 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2690 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 2691 if (err < 0) {
2692 printk(KERN_ERR
2693 "Failed to initialize the IGMP6 control socket (err %d).\n",
2694 err);
b8ad0cbc 2695 goto out;
1da177e4
LT		 2696 }
2697
1ed8516f 2698 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
1da177e4 2699
ea82edf7
DL		 2700 err = igmp6_proc_init(net);
2701 if (err)
b8ad0cbc 2702 goto out_sock_create;
b8ad0cbc
DL		 2703out:
2704 return err;
2705
2706out_sock_create:
1ed8516f 2707 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
b8ad0cbc 2708 goto out;
1da177e4
LT		 2709}
2710
2c8c1e72 2711static void __net_exit igmp6_net_exit(struct net *net)
1da177e4 2712{
1ed8516f 2713 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
ea82edf7 2714 igmp6_proc_exit(net);
1da177e4 2715}
b8ad0cbc
DL		 2716
2717static struct pernet_operations igmp6_net_ops = {
2718 .init = igmp6_net_init,
2719 .exit = igmp6_net_exit,
2720};
2721
2722int __init igmp6_init(void)
2723{
2724 return register_pernet_subsys(&igmp6_net_ops);
2725}
2726
2727void igmp6_cleanup(void)
2728{
2729 unregister_pernet_subsys(&igmp6_net_ops);
2730}
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