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[IPV4]: fix IPv4 leave-group group matching
[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) : \
167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \
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
173#define IPV6_MLD_MAX_MSF 10
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;
227 mc_lst->sflist = NULL;
228
229 /*
230 * now add/increase the group membership on the device
231 */
232
233 err = ipv6_dev_mc_inc(dev, addr);
234
235 if (err) {
236 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
237 dev_put(dev);
238 return err;
239 }
240
241 write_lock_bh(&ipv6_sk_mc_lock);
242 mc_lst->next = np->ipv6_mc_list;
243 np->ipv6_mc_list = mc_lst;
244 write_unlock_bh(&ipv6_sk_mc_lock);
245
246 dev_put(dev);
247
248 return 0;
249}
250
251/*
252 * socket leave on multicast group
253 */
254int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
255{
256 struct ipv6_pinfo *np = inet6_sk(sk);
257 struct ipv6_mc_socklist *mc_lst, **lnk;
258
259 write_lock_bh(&ipv6_sk_mc_lock);
260 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
261 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
262 ipv6_addr_equal(&mc_lst->addr, addr)) {
263 struct net_device *dev;
264
265 *lnk = mc_lst->next;
266 write_unlock_bh(&ipv6_sk_mc_lock);
267
268 if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
269 struct inet6_dev *idev = in6_dev_get(dev);
270
271 if (idev) {
272 (void) ip6_mc_leave_src(sk,mc_lst,idev);
273 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
274 in6_dev_put(idev);
275 }
276 dev_put(dev);
277 }
278 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
279 return 0;
280 }
281 }
282 write_unlock_bh(&ipv6_sk_mc_lock);
283
9951f036 284 return -EADDRNOTAVAIL;
1da177e4
LT		 285}
286
287static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
288{
289 struct net_device *dev = NULL;
290 struct inet6_dev *idev = NULL;
291
292 if (ifindex == 0) {
293 struct rt6_info *rt;
294
295 rt = rt6_lookup(group, NULL, 0, 0);
296 if (rt) {
297 dev = rt->rt6i_dev;
298 dev_hold(dev);
299 dst_release(&rt->u.dst);
300 }
301 } else
302 dev = dev_get_by_index(ifindex);
303
304 if (!dev)
305 return NULL;
306 idev = in6_dev_get(dev);
307 if (!idev) {
308 dev_put(dev);
309 return NULL;
310 }
311 read_lock_bh(&idev->lock);
312 if (idev->dead) {
313 read_unlock_bh(&idev->lock);
314 in6_dev_put(idev);
315 dev_put(dev);
316 return NULL;
317 }
318 return idev;
319}
320
321void ipv6_sock_mc_close(struct sock *sk)
322{
323 struct ipv6_pinfo *np = inet6_sk(sk);
324 struct ipv6_mc_socklist *mc_lst;
325
326 write_lock_bh(&ipv6_sk_mc_lock);
327 while ((mc_lst = np->ipv6_mc_list) != NULL) {
328 struct net_device *dev;
329
330 np->ipv6_mc_list = mc_lst->next;
331 write_unlock_bh(&ipv6_sk_mc_lock);
332
333 dev = dev_get_by_index(mc_lst->ifindex);
334 if (dev) {
335 struct inet6_dev *idev = in6_dev_get(dev);
336
337 if (idev) {
338 (void) ip6_mc_leave_src(sk, mc_lst, idev);
339 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
340 in6_dev_put(idev);
341 }
342 dev_put(dev);
343 }
344
345 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
346
347 write_lock_bh(&ipv6_sk_mc_lock);
348 }
349 write_unlock_bh(&ipv6_sk_mc_lock);
350}
351
352int ip6_mc_source(int add, int omode, struct sock *sk,
353 struct group_source_req *pgsr)
354{
355 struct in6_addr *source, *group;
356 struct ipv6_mc_socklist *pmc;
357 struct net_device *dev;
358 struct inet6_dev *idev;
359 struct ipv6_pinfo *inet6 = inet6_sk(sk);
360 struct ip6_sf_socklist *psl;
361 int i, j, rv;
c9e3e8b6 362 int leavegroup = 0;
1da177e4
LT		 363 int err;
364
365 if (pgsr->gsr_group.ss_family != AF_INET6 ||
366 pgsr->gsr_source.ss_family != AF_INET6)
367 return -EINVAL;
368
369 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
370 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
371
372 if (!ipv6_addr_is_multicast(group))
373 return -EINVAL;
374
375 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
376 if (!idev)
377 return -ENODEV;
378 dev = idev->dev;
379
380 err = -EADDRNOTAVAIL;
381
c9e3e8b6 382 read_lock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 383 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
384 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
385 continue;
386 if (ipv6_addr_equal(&pmc->addr, group))
387 break;
388 }
917f2f10
DS		 389 if (!pmc) { /* must have a prior join */
390 err = -EINVAL;
1da177e4 391 goto done;
917f2f10 392 }
1da177e4
LT		 393 /* if a source filter was set, must be the same mode as before */
394 if (pmc->sflist) {
917f2f10
DS		 395 if (pmc->sfmode != omode) {
396 err = -EINVAL;
1da177e4 397 goto done;
917f2f10 398 }
1da177e4
LT		 399 } else if (pmc->sfmode != omode) {
400 /* allow mode switches for empty-set filters */
401 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
402 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
403 pmc->sfmode = omode;
404 }
405
406 psl = pmc->sflist;
407 if (!add) {
408 if (!psl)
917f2f10 409 goto done; /* err = -EADDRNOTAVAIL */
1da177e4
LT		 410 rv = !0;
411 for (i=0; i<psl->sl_count; i++) {
412 rv = memcmp(&psl->sl_addr[i], source,
413 sizeof(struct in6_addr));
414 if (rv == 0)
415 break;
416 }
417 if (rv) /* source not found */
917f2f10 418 goto done; /* err = -EADDRNOTAVAIL */
1da177e4 419
c9e3e8b6
DS		 420 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
421 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
422 leavegroup = 1;
423 goto done;
424 }
425
1da177e4
LT		 426 /* update the interface filter */
427 ip6_mc_del_src(idev, group, omode, 1, source, 1);
428
429 for (j=i+1; j<psl->sl_count; j++)
430 psl->sl_addr[j-1] = psl->sl_addr[j];
431 psl->sl_count--;
432 err = 0;
433 goto done;
434 }
435 /* else, add a new source to the filter */
436
437 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
438 err = -ENOBUFS;
439 goto done;
440 }
441 if (!psl || psl->sl_count == psl->sl_max) {
442 struct ip6_sf_socklist *newpsl;
443 int count = IP6_SFBLOCK;
444
445 if (psl)
446 count += psl->sl_max;
447 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
448 IP6_SFLSIZE(count), GFP_ATOMIC);
449 if (!newpsl) {
450 err = -ENOBUFS;
451 goto done;
452 }
453 newpsl->sl_max = count;
454 newpsl->sl_count = count - IP6_SFBLOCK;
455 if (psl) {
456 for (i=0; i<psl->sl_count; i++)
457 newpsl->sl_addr[i] = psl->sl_addr[i];
458 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
459 }
460 pmc->sflist = psl = newpsl;
461 }
462 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
463 for (i=0; i<psl->sl_count; i++) {
464 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
465 if (rv == 0)
466 break;
467 }
468 if (rv == 0) /* address already there is an error */
469 goto done;
470 for (j=psl->sl_count-1; j>=i; j--)
471 psl->sl_addr[j+1] = psl->sl_addr[j];
472 psl->sl_addr[i] = *source;
473 psl->sl_count++;
474 err = 0;
475 /* update the interface list */
476 ip6_mc_add_src(idev, group, omode, 1, source, 1);
477done:
c9e3e8b6 478 read_unlock_bh(&ipv6_sk_mc_lock);
1da177e4
LT		 479 read_unlock_bh(&idev->lock);
480 in6_dev_put(idev);
481 dev_put(dev);
c9e3e8b6
DS		 482 if (leavegroup)
483 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
1da177e4
LT		 484 return err;
485}
486
487int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
488{
489 struct in6_addr *group;
490 struct ipv6_mc_socklist *pmc;
491 struct net_device *dev;
492 struct inet6_dev *idev;
493 struct ipv6_pinfo *inet6 = inet6_sk(sk);
494 struct ip6_sf_socklist *newpsl, *psl;
9951f036 495 int leavegroup = 0;
1da177e4
LT		 496 int i, err;
497
498 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
499
500 if (!ipv6_addr_is_multicast(group))
501 return -EINVAL;
502 if (gsf->gf_fmode != MCAST_INCLUDE &&
503 gsf->gf_fmode != MCAST_EXCLUDE)
504 return -EINVAL;
505
506 idev = ip6_mc_find_dev(group, gsf->gf_interface);
507
508 if (!idev)
509 return -ENODEV;
510 dev = idev->dev;
1da177e4 511
9951f036
DS		 512 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
513 leavegroup = 1;
514 goto done;
515 }
516
1da177e4
LT		 517 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
518 if (pmc->ifindex != gsf->gf_interface)
519 continue;
520 if (ipv6_addr_equal(&pmc->addr, group))
521 break;
522 }
917f2f10
DS		 523 if (!pmc) { /* must have a prior join */
524 err = -EINVAL;
1da177e4 525 goto done;
917f2f10 526 }
1da177e4
LT		 527 if (gsf->gf_numsrc) {
528 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
529 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
530 if (!newpsl) {
531 err = -ENOBUFS;
532 goto done;
533 }
534 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
535 for (i=0; i<newpsl->sl_count; ++i) {
536 struct sockaddr_in6 *psin6;
537
538 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
539 newpsl->sl_addr[i] = psin6->sin6_addr;
540 }
541 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
542 newpsl->sl_count, newpsl->sl_addr, 0);
543 if (err) {
544 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
545 goto done;
546 }
547 } else
548 newpsl = NULL;
549 psl = pmc->sflist;
550 if (psl) {
551 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
552 psl->sl_count, psl->sl_addr, 0);
553 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
554 } else
555 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
556 pmc->sflist = newpsl;
557 pmc->sfmode = gsf->gf_fmode;
917f2f10 558 err = 0;
1da177e4
LT		 559done:
560 read_unlock_bh(&idev->lock);
561 in6_dev_put(idev);
562 dev_put(dev);
9951f036
DS		 563 if (leavegroup)
564 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 565 return err;
566}
567
568int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
569 struct group_filter __user *optval, int __user *optlen)
570{
571 int err, i, count, copycount;
572 struct in6_addr *group;
573 struct ipv6_mc_socklist *pmc;
574 struct inet6_dev *idev;
575 struct net_device *dev;
576 struct ipv6_pinfo *inet6 = inet6_sk(sk);
577 struct ip6_sf_socklist *psl;
578
579 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
580
581 if (!ipv6_addr_is_multicast(group))
582 return -EINVAL;
583
584 idev = ip6_mc_find_dev(group, gsf->gf_interface);
585
586 if (!idev)
587 return -ENODEV;
588
589 dev = idev->dev;
590
591 err = -EADDRNOTAVAIL;
592
593 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
594 if (pmc->ifindex != gsf->gf_interface)
595 continue;
596 if (ipv6_addr_equal(group, &pmc->addr))
597 break;
598 }
599 if (!pmc) /* must have a prior join */
600 goto done;
601 gsf->gf_fmode = pmc->sfmode;
602 psl = pmc->sflist;
603 count = psl ? psl->sl_count : 0;
604 read_unlock_bh(&idev->lock);
605 in6_dev_put(idev);
606 dev_put(dev);
607
608 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
609 gsf->gf_numsrc = count;
610 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
611 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
612 return -EFAULT;
613 }
614 for (i=0; i<copycount; i++) {
615 struct sockaddr_in6 *psin6;
616 struct sockaddr_storage ss;
617
618 psin6 = (struct sockaddr_in6 *)&ss;
619 memset(&ss, 0, sizeof(ss));
620 psin6->sin6_family = AF_INET6;
621 psin6->sin6_addr = psl->sl_addr[i];
622 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
623 return -EFAULT;
624 }
625 return 0;
626done:
627 read_unlock_bh(&idev->lock);
628 in6_dev_put(idev);
629 dev_put(dev);
630 return err;
631}
632
633int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
634 struct in6_addr *src_addr)
635{
636 struct ipv6_pinfo *np = inet6_sk(sk);
637 struct ipv6_mc_socklist *mc;
638 struct ip6_sf_socklist *psl;
639 int rv = 1;
640
641 read_lock(&ipv6_sk_mc_lock);
642 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
643 if (ipv6_addr_equal(&mc->addr, mc_addr))
644 break;
645 }
646 if (!mc) {
647 read_unlock(&ipv6_sk_mc_lock);
648 return 1;
649 }
650 psl = mc->sflist;
651 if (!psl) {
652 rv = mc->sfmode == MCAST_EXCLUDE;
653 } else {
654 int i;
655
656 for (i=0; i<psl->sl_count; i++) {
657 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
658 break;
659 }
660 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
661 rv = 0;
662 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
663 rv = 0;
664 }
665 read_unlock(&ipv6_sk_mc_lock);
666
667 return rv;
668}
669
670static void ma_put(struct ifmcaddr6 *mc)
671{
672 if (atomic_dec_and_test(&mc->mca_refcnt)) {
673 in6_dev_put(mc->idev);
674 kfree(mc);
675 }
676}
677
678static void igmp6_group_added(struct ifmcaddr6 *mc)
679{
680 struct net_device *dev = mc->idev->dev;
681 char buf[MAX_ADDR_LEN];
682
683 spin_lock_bh(&mc->mca_lock);
684 if (!(mc->mca_flags&MAF_LOADED)) {
685 mc->mca_flags |= MAF_LOADED;
686 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
687 dev_mc_add(dev, buf, dev->addr_len, 0);
688 }
689 spin_unlock_bh(&mc->mca_lock);
690
691 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
692 return;
693
694 if (MLD_V1_SEEN(mc->idev)) {
695 igmp6_join_group(mc);
696 return;
697 }
698 /* else v2 */
699
700 mc->mca_crcount = mc->idev->mc_qrv;
701 mld_ifc_event(mc->idev);
702}
703
704static void igmp6_group_dropped(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_delete(dev, buf, dev->addr_len, 0);
714 }
715
716 if (mc->mca_flags & MAF_NOREPORT)
717 goto done;
718 spin_unlock_bh(&mc->mca_lock);
719
720 if (!mc->idev->dead)
721 igmp6_leave_group(mc);
722
723 spin_lock_bh(&mc->mca_lock);
724 if (del_timer(&mc->mca_timer))
725 atomic_dec(&mc->mca_refcnt);
726done:
727 ip6_mc_clear_src(mc);
728 spin_unlock_bh(&mc->mca_lock);
729}
730
731/*
732 * deleted ifmcaddr6 manipulation
733 */
734static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
735{
736 struct ifmcaddr6 *pmc;
737
738 /* this is an "ifmcaddr6" for convenience; only the fields below
739 * are actually used. In particular, the refcnt and users are not
740 * used for management of the delete list. Using the same structure
741 * for deleted items allows change reports to use common code with
742 * non-deleted or query-response MCA's.
743 */
744 pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
745 if (!pmc)
746 return;
747 memset(pmc, 0, sizeof(*pmc));
748 spin_lock_bh(&im->mca_lock);
749 spin_lock_init(&pmc->mca_lock);
750 pmc->idev = im->idev;
751 in6_dev_hold(idev);
752 pmc->mca_addr = im->mca_addr;
753 pmc->mca_crcount = idev->mc_qrv;
754 pmc->mca_sfmode = im->mca_sfmode;
755 if (pmc->mca_sfmode == MCAST_INCLUDE) {
756 struct ip6_sf_list *psf;
757
758 pmc->mca_tomb = im->mca_tomb;
759 pmc->mca_sources = im->mca_sources;
760 im->mca_tomb = im->mca_sources = NULL;
761 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
762 psf->sf_crcount = pmc->mca_crcount;
763 }
764 spin_unlock_bh(&im->mca_lock);
765
766 write_lock_bh(&idev->mc_lock);
767 pmc->next = idev->mc_tomb;
768 idev->mc_tomb = pmc;
769 write_unlock_bh(&idev->mc_lock);
770}
771
772static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
773{
774 struct ifmcaddr6 *pmc, *pmc_prev;
775 struct ip6_sf_list *psf, *psf_next;
776
777 write_lock_bh(&idev->mc_lock);
778 pmc_prev = NULL;
779 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
780 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
781 break;
782 pmc_prev = pmc;
783 }
784 if (pmc) {
785 if (pmc_prev)
786 pmc_prev->next = pmc->next;
787 else
788 idev->mc_tomb = pmc->next;
789 }
790 write_unlock_bh(&idev->mc_lock);
791 if (pmc) {
792 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
793 psf_next = psf->sf_next;
794 kfree(psf);
795 }
796 in6_dev_put(pmc->idev);
797 kfree(pmc);
798 }
799}
800
801static void mld_clear_delrec(struct inet6_dev *idev)
802{
803 struct ifmcaddr6 *pmc, *nextpmc;
804
805 write_lock_bh(&idev->mc_lock);
806 pmc = idev->mc_tomb;
807 idev->mc_tomb = NULL;
808 write_unlock_bh(&idev->mc_lock);
809
810 for (; pmc; pmc = nextpmc) {
811 nextpmc = pmc->next;
812 ip6_mc_clear_src(pmc);
813 in6_dev_put(pmc->idev);
814 kfree(pmc);
815 }
816
817 /* clear dead sources, too */
818 read_lock_bh(&idev->lock);
819 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
820 struct ip6_sf_list *psf, *psf_next;
821
822 spin_lock_bh(&pmc->mca_lock);
823 psf = pmc->mca_tomb;
824 pmc->mca_tomb = NULL;
825 spin_unlock_bh(&pmc->mca_lock);
826 for (; psf; psf=psf_next) {
827 psf_next = psf->sf_next;
828 kfree(psf);
829 }
830 }
831 read_unlock_bh(&idev->lock);
832}
833
834
835/*
836 * device multicast group inc (add if not found)
837 */
838int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
839{
840 struct ifmcaddr6 *mc;
841 struct inet6_dev *idev;
842
843 idev = in6_dev_get(dev);
844
845 if (idev == NULL)
846 return -EINVAL;
847
848 write_lock_bh(&idev->lock);
849 if (idev->dead) {
850 write_unlock_bh(&idev->lock);
851 in6_dev_put(idev);
852 return -ENODEV;
853 }
854
855 for (mc = idev->mc_list; mc; mc = mc->next) {
856 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
857 mc->mca_users++;
858 write_unlock_bh(&idev->lock);
859 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
860 NULL, 0);
861 in6_dev_put(idev);
862 return 0;
863 }
864 }
865
866 /*
867 * not found: create a new one.
868 */
869
870 mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
871
872 if (mc == NULL) {
873 write_unlock_bh(&idev->lock);
874 in6_dev_put(idev);
875 return -ENOMEM;
876 }
877
878 memset(mc, 0, sizeof(struct ifmcaddr6));
879 init_timer(&mc->mca_timer);
880 mc->mca_timer.function = igmp6_timer_handler;
881 mc->mca_timer.data = (unsigned long) mc;
882
883 ipv6_addr_copy(&mc->mca_addr, addr);
884 mc->idev = idev;
885 mc->mca_users = 1;
886 /* mca_stamp should be updated upon changes */
887 mc->mca_cstamp = mc->mca_tstamp = jiffies;
888 atomic_set(&mc->mca_refcnt, 2);
889 spin_lock_init(&mc->mca_lock);
890
891 /* initial mode is (EX, empty) */
892 mc->mca_sfmode = MCAST_EXCLUDE;
893 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
894
895 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
896 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
897 mc->mca_flags |= MAF_NOREPORT;
898
899 mc->next = idev->mc_list;
900 idev->mc_list = mc;
901 write_unlock_bh(&idev->lock);
902
903 mld_del_delrec(idev, &mc->mca_addr);
904 igmp6_group_added(mc);
905 ma_put(mc);
906 return 0;
907}
908
909/*
910 * device multicast group del
911 */
912int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
913{
914 struct ifmcaddr6 *ma, **map;
915
916 write_lock_bh(&idev->lock);
917 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
918 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
919 if (--ma->mca_users == 0) {
920 *map = ma->next;
921 write_unlock_bh(&idev->lock);
922
923 igmp6_group_dropped(ma);
924
925 ma_put(ma);
926 return 0;
927 }
928 write_unlock_bh(&idev->lock);
929 return 0;
930 }
931 }
932 write_unlock_bh(&idev->lock);
933
934 return -ENOENT;
935}
936
937int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
938{
939 struct inet6_dev *idev = in6_dev_get(dev);
940 int err;
941
942 if (!idev)
943 return -ENODEV;
944
945 err = __ipv6_dev_mc_dec(idev, addr);
946
947 in6_dev_put(idev);
948
949 return err;
950}
951
952/*
953 * identify MLD packets for MLD filter exceptions
954 */
955int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
956{
957 struct icmp6hdr *pic;
958
959 if (nexthdr != IPPROTO_ICMPV6)
960 return 0;
961
962 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
963 return 0;
964
965 pic = (struct icmp6hdr *)skb->h.raw;
966
967 switch (pic->icmp6_type) {
968 case ICMPV6_MGM_QUERY:
969 case ICMPV6_MGM_REPORT:
970 case ICMPV6_MGM_REDUCTION:
971 case ICMPV6_MLD2_REPORT:
972 return 1;
973 default:
974 break;
975 }
976 return 0;
977}
978
979/*
980 * check if the interface/address pair is valid
981 */
982int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
983 struct in6_addr *src_addr)
984{
985 struct inet6_dev *idev;
986 struct ifmcaddr6 *mc;
987 int rv = 0;
988
989 idev = in6_dev_get(dev);
990 if (idev) {
991 read_lock_bh(&idev->lock);
992 for (mc = idev->mc_list; mc; mc=mc->next) {
993 if (ipv6_addr_equal(&mc->mca_addr, group))
994 break;
995 }
996 if (mc) {
997 if (src_addr && !ipv6_addr_any(src_addr)) {
998 struct ip6_sf_list *psf;
999
1000 spin_lock_bh(&mc->mca_lock);
1001 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1002 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1003 break;
1004 }
1005 if (psf)
1006 rv = psf->sf_count[MCAST_INCLUDE] ||
1007 psf->sf_count[MCAST_EXCLUDE] !=
1008 mc->mca_sfcount[MCAST_EXCLUDE];
1009 else
1010 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1011 spin_unlock_bh(&mc->mca_lock);
1012 } else
1013 rv = 1; /* don't filter unspecified source */
1014 }
1015 read_unlock_bh(&idev->lock);
1016 in6_dev_put(idev);
1017 }
1018 return rv;
1019}
1020
1021static void mld_gq_start_timer(struct inet6_dev *idev)
1022{
1023 int tv = net_random() % idev->mc_maxdelay;
1024
1025 idev->mc_gq_running = 1;
1026 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1027 in6_dev_hold(idev);
1028}
1029
1030static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1031{
1032 int tv = net_random() % delay;
1033
1034 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1035 in6_dev_hold(idev);
1036}
1037
1038/*
1039 * IGMP handling (alias multicast ICMPv6 messages)
1040 */
1041
1042static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1043{
1044 unsigned long delay = resptime;
1045
1046 /* Do not start timer for these addresses */
1047 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1048 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1049 return;
1050
1051 if (del_timer(&ma->mca_timer)) {
1052 atomic_dec(&ma->mca_refcnt);
1053 delay = ma->mca_timer.expires - jiffies;
1054 }
1055
1056 if (delay >= resptime) {
1057 if (resptime)
1058 delay = net_random() % resptime;
1059 else
1060 delay = 1;
1061 }
1062 ma->mca_timer.expires = jiffies + delay;
1063 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1064 atomic_inc(&ma->mca_refcnt);
1065 ma->mca_flags |= MAF_TIMER_RUNNING;
1066}
1067
1068static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1069 struct in6_addr *srcs)
1070{
1071 struct ip6_sf_list *psf;
1072 int i, scount;
1073
1074 scount = 0;
1075 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1076 if (scount == nsrcs)
1077 break;
1078 for (i=0; i<nsrcs; i++)
1079 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1080 psf->sf_gsresp = 1;
1081 scount++;
1082 break;
1083 }
1084 }
1085}
1086
1087int igmp6_event_query(struct sk_buff *skb)
1088{
1089 struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw;
1090 struct ifmcaddr6 *ma;
1091 struct in6_addr *group;
1092 unsigned long max_delay;
1093 struct inet6_dev *idev;
1094 struct icmp6hdr *hdr;
1095 int group_type;
1096 int mark = 0;
1097 int len;
1098
1099 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1100 return -EINVAL;
1101
1102 /* compute payload length excluding extension headers */
1103 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1104 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1105
1106 /* Drop queries with not link local source */
1107 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1108 return -EINVAL;
1109
1110 idev = in6_dev_get(skb->dev);
1111
1112 if (idev == NULL)
1113 return 0;
1114
1115 hdr = (struct icmp6hdr *) skb->h.raw;
1116 group = (struct in6_addr *) (hdr + 1);
1117 group_type = ipv6_addr_type(group);
1118
1119 if (group_type != IPV6_ADDR_ANY &&
1120 !(group_type&IPV6_ADDR_MULTICAST)) {
1121 in6_dev_put(idev);
1122 return -EINVAL;
1123 }
1124
1125 if (len == 24) {
1126 int switchback;
1127 /* MLDv1 router present */
1128
1129 /* Translate milliseconds to jiffies */
1130 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1131
1132 switchback = (idev->mc_qrv + 1) * max_delay;
1133 idev->mc_v1_seen = jiffies + switchback;
1134
1135 /* cancel the interface change timer */
1136 idev->mc_ifc_count = 0;
1137 if (del_timer(&idev->mc_ifc_timer))
1138 __in6_dev_put(idev);
1139 /* clear deleted report items */
1140 mld_clear_delrec(idev);
1141 } else if (len >= 28) {
1142 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1143 if (!max_delay)
1144 max_delay = 1;
1145 idev->mc_maxdelay = max_delay;
1146 if (mlh2->qrv)
1147 idev->mc_qrv = mlh2->qrv;
1148 if (group_type == IPV6_ADDR_ANY) { /* general query */
1149 if (mlh2->nsrcs) {
1150 in6_dev_put(idev);
1151 return -EINVAL; /* no sources allowed */
1152 }
1153 mld_gq_start_timer(idev);
1154 in6_dev_put(idev);
1155 return 0;
1156 }
1157 /* mark sources to include, if group & source-specific */
1158 mark = mlh2->nsrcs != 0;
1159 } else {
1160 in6_dev_put(idev);
1161 return -EINVAL;
1162 }
1163
1164 read_lock_bh(&idev->lock);
1165 if (group_type == IPV6_ADDR_ANY) {
1166 for (ma = idev->mc_list; ma; ma=ma->next) {
1167 spin_lock_bh(&ma->mca_lock);
1168 igmp6_group_queried(ma, max_delay);
1169 spin_unlock_bh(&ma->mca_lock);
1170 }
1171 } else {
1172 for (ma = idev->mc_list; ma; ma=ma->next) {
1173 if (group_type != IPV6_ADDR_ANY &&
1174 !ipv6_addr_equal(group, &ma->mca_addr))
1175 continue;
1176 spin_lock_bh(&ma->mca_lock);
1177 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1178 /* gsquery <- gsquery && mark */
1179 if (!mark)
1180 ma->mca_flags &= ~MAF_GSQUERY;
1181 } else {
1182 /* gsquery <- mark */
1183 if (mark)
1184 ma->mca_flags |= MAF_GSQUERY;
1185 else
1186 ma->mca_flags &= ~MAF_GSQUERY;
1187 }
1188 if (ma->mca_flags & MAF_GSQUERY)
1189 mld_marksources(ma, ntohs(mlh2->nsrcs),
1190 mlh2->srcs);
1191 igmp6_group_queried(ma, max_delay);
1192 spin_unlock_bh(&ma->mca_lock);
1193 if (group_type != IPV6_ADDR_ANY)
1194 break;
1195 }
1196 }
1197 read_unlock_bh(&idev->lock);
1198 in6_dev_put(idev);
1199
1200 return 0;
1201}
1202
1203
1204int igmp6_event_report(struct sk_buff *skb)
1205{
1206 struct ifmcaddr6 *ma;
1207 struct in6_addr *addrp;
1208 struct inet6_dev *idev;
1209 struct icmp6hdr *hdr;
1210 int addr_type;
1211
1212 /* Our own report looped back. Ignore it. */
1213 if (skb->pkt_type == PACKET_LOOPBACK)
1214 return 0;
1215
1216 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1217 return -EINVAL;
1218
1219 hdr = (struct icmp6hdr*) skb->h.raw;
1220
1221 /* Drop reports with not link local source */
1222 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1223 if (addr_type != IPV6_ADDR_ANY &&
1224 !(addr_type&IPV6_ADDR_LINKLOCAL))
1225 return -EINVAL;
1226
1227 addrp = (struct in6_addr *) (hdr + 1);
1228
1229 idev = in6_dev_get(skb->dev);
1230 if (idev == NULL)
1231 return -ENODEV;
1232
1233 /*
1234 * Cancel the timer for this group
1235 */
1236
1237 read_lock_bh(&idev->lock);
1238 for (ma = idev->mc_list; ma; ma=ma->next) {
1239 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1240 spin_lock(&ma->mca_lock);
1241 if (del_timer(&ma->mca_timer))
1242 atomic_dec(&ma->mca_refcnt);
1243 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1244 spin_unlock(&ma->mca_lock);
1245 break;
1246 }
1247 }
1248 read_unlock_bh(&idev->lock);
1249 in6_dev_put(idev);
1250 return 0;
1251}
1252
1253static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1254 int gdeleted, int sdeleted)
1255{
1256 switch (type) {
1257 case MLD2_MODE_IS_INCLUDE:
1258 case MLD2_MODE_IS_EXCLUDE:
1259 if (gdeleted || sdeleted)
1260 return 0;
1261 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
1262 case MLD2_CHANGE_TO_INCLUDE:
1263 if (gdeleted || sdeleted)
1264 return 0;
1265 return psf->sf_count[MCAST_INCLUDE] != 0;
1266 case MLD2_CHANGE_TO_EXCLUDE:
1267 if (gdeleted || sdeleted)
1268 return 0;
1269 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1270 psf->sf_count[MCAST_INCLUDE])
1271 return 0;
1272 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1273 psf->sf_count[MCAST_EXCLUDE];
1274 case MLD2_ALLOW_NEW_SOURCES:
1275 if (gdeleted || !psf->sf_crcount)
1276 return 0;
1277 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1278 case MLD2_BLOCK_OLD_SOURCES:
1279 if (pmc->mca_sfmode == MCAST_INCLUDE)
1280 return gdeleted || (psf->sf_crcount && sdeleted);
1281 return psf->sf_crcount && !gdeleted && !sdeleted;
1282 }
1283 return 0;
1284}
1285
1286static int
1287mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1288{
1289 struct ip6_sf_list *psf;
1290 int scount = 0;
1291
1292 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1293 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1294 continue;
1295 scount++;
1296 }
1297 return scount;
1298}
1299
1300static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1301{
1302 struct sock *sk = igmp6_socket->sk;
1303 struct sk_buff *skb;
1304 struct mld2_report *pmr;
1305 struct in6_addr addr_buf;
1306 int err;
1307 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1308 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1309 IPV6_TLV_PADN, 0 };
1310
1311 /* we assume size > sizeof(ra) here */
1312 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1313
1314 if (skb == 0)
1315 return NULL;
1316
1317 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1318
1319 if (ipv6_get_lladdr(dev, &addr_buf)) {
1320 /* <draft-ietf-magma-mld-source-05.txt>:
1321 * use unspecified address as the source address
1322 * when a valid link-local address is not available.
1323 */
1324 memset(&addr_buf, 0, sizeof(addr_buf));
1325 }
1326
1327 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1328
1329 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1330
1331 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1332 skb->h.raw = (unsigned char *)pmr;
1333 pmr->type = ICMPV6_MLD2_REPORT;
1334 pmr->resv1 = 0;
1335 pmr->csum = 0;
1336 pmr->resv2 = 0;
1337 pmr->ngrec = 0;
1338 return skb;
1339}
1340
e9823185
PM		 1341static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1342{
1343 struct net_device *dev = skb->dev;
1344
1345 if (dev->hard_header) {
1346 unsigned char ha[MAX_ADDR_LEN];
1347 int err;
1348
1349 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1350 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1351 if (err < 0) {
1352 kfree_skb(skb);
1353 return err;
1354 }
1355 }
1356 return dev_queue_xmit(skb);
1357}
1358
1359static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1360{
1361 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1362 mld_dev_queue_xmit2);
1363}
1364
1da177e4
LT		 1365static void mld_sendpack(struct sk_buff *skb)
1366{
1367 struct ipv6hdr *pip6 = skb->nh.ipv6h;
1368 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1369 int payload_len, mldlen;
1370 struct inet6_dev *idev = in6_dev_get(skb->dev);
1371 int err;
1372
1373 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1374 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1375 sizeof(struct ipv6hdr);
1376 mldlen = skb->tail - skb->h.raw;
1377 pip6->payload_len = htons(payload_len);
1378
1379 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1380 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1381 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1382 mld_dev_queue_xmit);
1da177e4
LT		 1383 if (!err) {
1384 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1385 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1386 } else
1387 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1388
1389 if (likely(idev != NULL))
1390 in6_dev_put(idev);
1391}
1392
1393static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1394{
1395 return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel);
1396}
1397
1398static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1399 int type, struct mld2_grec **ppgr)
1400{
1401 struct net_device *dev = pmc->idev->dev;
1402 struct mld2_report *pmr;
1403 struct mld2_grec *pgr;
1404
1405 if (!skb)
1406 skb = mld_newpack(dev, dev->mtu);
1407 if (!skb)
1408 return NULL;
1409 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1410 pgr->grec_type = type;
1411 pgr->grec_auxwords = 0;
1412 pgr->grec_nsrcs = 0;
1413 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1414 pmr = (struct mld2_report *)skb->h.raw;
1415 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1416 *ppgr = pgr;
1417 return skb;
1418}
1419
1420#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1421 skb_tailroom(skb)) : 0)
1422
1423static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1424 int type, int gdeleted, int sdeleted)
1425{
1426 struct net_device *dev = pmc->idev->dev;
1427 struct mld2_report *pmr;
1428 struct mld2_grec *pgr = NULL;
1429 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1430 int scount, first, isquery, truncate;
1431
1432 if (pmc->mca_flags & MAF_NOREPORT)
1433 return skb;
1434
1435 isquery = type == MLD2_MODE_IS_INCLUDE ||
1436 type == MLD2_MODE_IS_EXCLUDE;
1437 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1438 type == MLD2_CHANGE_TO_EXCLUDE;
1439
1440 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1441
1442 if (!*psf_list) {
1443 if (type == MLD2_ALLOW_NEW_SOURCES ||
1444 type == MLD2_BLOCK_OLD_SOURCES)
1445 return skb;
1446 if (pmc->mca_crcount || isquery) {
1447 /* make sure we have room for group header and at
1448 * least one source.
1449 */
1450 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
1451 sizeof(struct in6_addr)) {
1452 mld_sendpack(skb);
1453 skb = NULL; /* add_grhead will get a new one */
1454 }
1455 skb = add_grhead(skb, pmc, type, &pgr);
1456 }
1457 return skb;
1458 }
1459 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1460
1461 /* EX and TO_EX get a fresh packet, if needed */
1462 if (truncate) {
1463 if (pmr && pmr->ngrec &&
1464 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1465 if (skb)
1466 mld_sendpack(skb);
1467 skb = mld_newpack(dev, dev->mtu);
1468 }
1469 }
1470 first = 1;
1471 scount = 0;
1472 psf_prev = NULL;
1473 for (psf=*psf_list; psf; psf=psf_next) {
1474 struct in6_addr *psrc;
1475
1476 psf_next = psf->sf_next;
1477
1478 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1479 psf_prev = psf;
1480 continue;
1481 }
1482
1483 /* clear marks on query responses */
1484 if (isquery)
1485 psf->sf_gsresp = 0;
1486
1487 if (AVAILABLE(skb) < sizeof(*psrc) +
1488 first*sizeof(struct mld2_grec)) {
1489 if (truncate && !first)
1490 break; /* truncate these */
1491 if (pgr)
1492 pgr->grec_nsrcs = htons(scount);
1493 if (skb)
1494 mld_sendpack(skb);
1495 skb = mld_newpack(dev, dev->mtu);
1496 first = 1;
1497 scount = 0;
1498 }
1499 if (first) {
1500 skb = add_grhead(skb, pmc, type, &pgr);
1501 first = 0;
1502 }
1503 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1504 *psrc = psf->sf_addr;
1505 scount++;
1506 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1507 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1508 psf->sf_crcount--;
1509 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1510 if (psf_prev)
1511 psf_prev->sf_next = psf->sf_next;
1512 else
1513 *psf_list = psf->sf_next;
1514 kfree(psf);
1515 continue;
1516 }
1517 }
1518 psf_prev = psf;
1519 }
1520 if (pgr)
1521 pgr->grec_nsrcs = htons(scount);
1522
1523 if (isquery)
1524 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1525 return skb;
1526}
1527
1528static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1529{
1530 struct sk_buff *skb = NULL;
1531 int type;
1532
1533 if (!pmc) {
1534 read_lock_bh(&idev->lock);
1535 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1536 if (pmc->mca_flags & MAF_NOREPORT)
1537 continue;
1538 spin_lock_bh(&pmc->mca_lock);
1539 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1540 type = MLD2_MODE_IS_EXCLUDE;
1541 else
1542 type = MLD2_MODE_IS_INCLUDE;
1543 skb = add_grec(skb, pmc, type, 0, 0);
1544 spin_unlock_bh(&pmc->mca_lock);
1545 }
1546 read_unlock_bh(&idev->lock);
1547 } else {
1548 spin_lock_bh(&pmc->mca_lock);
1549 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1550 type = MLD2_MODE_IS_EXCLUDE;
1551 else
1552 type = MLD2_MODE_IS_INCLUDE;
1553 skb = add_grec(skb, pmc, type, 0, 0);
1554 spin_unlock_bh(&pmc->mca_lock);
1555 }
1556 if (skb)
1557 mld_sendpack(skb);
1558}
1559
1560/*
1561 * remove zero-count source records from a source filter list
1562 */
1563static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1564{
1565 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1566
1567 psf_prev = NULL;
1568 for (psf=*ppsf; psf; psf = psf_next) {
1569 psf_next = psf->sf_next;
1570 if (psf->sf_crcount == 0) {
1571 if (psf_prev)
1572 psf_prev->sf_next = psf->sf_next;
1573 else
1574 *ppsf = psf->sf_next;
1575 kfree(psf);
1576 } else
1577 psf_prev = psf;
1578 }
1579}
1580
1581static void mld_send_cr(struct inet6_dev *idev)
1582{
1583 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1584 struct sk_buff *skb = NULL;
1585 int type, dtype;
1586
1587 read_lock_bh(&idev->lock);
1588 write_lock_bh(&idev->mc_lock);
1589
1590 /* deleted MCA's */
1591 pmc_prev = NULL;
1592 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1593 pmc_next = pmc->next;
1594 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1595 type = MLD2_BLOCK_OLD_SOURCES;
1596 dtype = MLD2_BLOCK_OLD_SOURCES;
1597 skb = add_grec(skb, pmc, type, 1, 0);
1598 skb = add_grec(skb, pmc, dtype, 1, 1);
1599 }
1600 if (pmc->mca_crcount) {
1601 pmc->mca_crcount--;
1602 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1603 type = MLD2_CHANGE_TO_INCLUDE;
1604 skb = add_grec(skb, pmc, type, 1, 0);
1605 }
1606 if (pmc->mca_crcount == 0) {
1607 mld_clear_zeros(&pmc->mca_tomb);
1608 mld_clear_zeros(&pmc->mca_sources);
1609 }
1610 }
1611 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1612 !pmc->mca_sources) {
1613 if (pmc_prev)
1614 pmc_prev->next = pmc_next;
1615 else
1616 idev->mc_tomb = pmc_next;
1617 in6_dev_put(pmc->idev);
1618 kfree(pmc);
1619 } else
1620 pmc_prev = pmc;
1621 }
1622 write_unlock_bh(&idev->mc_lock);
1623
1624 /* change recs */
1625 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1626 spin_lock_bh(&pmc->mca_lock);
1627 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1628 type = MLD2_BLOCK_OLD_SOURCES;
1629 dtype = MLD2_ALLOW_NEW_SOURCES;
1630 } else {
1631 type = MLD2_ALLOW_NEW_SOURCES;
1632 dtype = MLD2_BLOCK_OLD_SOURCES;
1633 }
1634 skb = add_grec(skb, pmc, type, 0, 0);
1635 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1636
1637 /* filter mode changes */
1638 if (pmc->mca_crcount) {
1639 pmc->mca_crcount--;
1640 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1641 type = MLD2_CHANGE_TO_EXCLUDE;
1642 else
1643 type = MLD2_CHANGE_TO_INCLUDE;
1644 skb = add_grec(skb, pmc, type, 0, 0);
1645 }
1646 spin_unlock_bh(&pmc->mca_lock);
1647 }
1648 read_unlock_bh(&idev->lock);
1649 if (!skb)
1650 return;
1651 (void) mld_sendpack(skb);
1652}
1653
1654static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1655{
1656 struct sock *sk = igmp6_socket->sk;
1657 struct inet6_dev *idev;
1658 struct sk_buff *skb;
1659 struct icmp6hdr *hdr;
1660 struct in6_addr *snd_addr;
1661 struct in6_addr *addrp;
1662 struct in6_addr addr_buf;
1663 struct in6_addr all_routers;
1664 int err, len, payload_len, full_len;
1665 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1666 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1667 IPV6_TLV_PADN, 0 };
1668
1669 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1670 snd_addr = addr;
1671 if (type == ICMPV6_MGM_REDUCTION) {
1672 snd_addr = &all_routers;
1673 ipv6_addr_all_routers(&all_routers);
1674 }
1675
1676 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1677 payload_len = len + sizeof(ra);
1678 full_len = sizeof(struct ipv6hdr) + payload_len;
1679
1680 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1681
1682 if (skb == NULL) {
1683 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1684 return;
1685 }
1686
1687 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1688
1689 if (ipv6_get_lladdr(dev, &addr_buf)) {
1690 /* <draft-ietf-magma-mld-source-05.txt>:
1691 * use unspecified address as the source address
1692 * when a valid link-local address is not available.
1693 */
1694 memset(&addr_buf, 0, sizeof(addr_buf));
1695 }
1696
1697 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1698
1699 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1700
1701 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1702 memset(hdr, 0, sizeof(struct icmp6hdr));
1703 hdr->icmp6_type = type;
1704
1705 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1706 ipv6_addr_copy(addrp, addr);
1707
1708 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1709 IPPROTO_ICMPV6,
1710 csum_partial((__u8 *) hdr, len, 0));
1711
1712 idev = in6_dev_get(skb->dev);
1713
1714 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1715 mld_dev_queue_xmit);
1da177e4
LT		 1716 if (!err) {
1717 if (type == ICMPV6_MGM_REDUCTION)
1718 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1719 else
1720 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1721 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1722 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1723 } else
1724 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1725
1726 if (likely(idev != NULL))
1727 in6_dev_put(idev);
1728 return;
1da177e4
LT		 1729}
1730
1731static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1732 struct in6_addr *psfsrc)
1733{
1734 struct ip6_sf_list *psf, *psf_prev;
1735 int rv = 0;
1736
1737 psf_prev = NULL;
1738 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1739 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1740 break;
1741 psf_prev = psf;
1742 }
1743 if (!psf || psf->sf_count[sfmode] == 0) {
1744 /* source filter not found, or count wrong => bug */
1745 return -ESRCH;
1746 }
1747 psf->sf_count[sfmode]--;
1748 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1749 struct inet6_dev *idev = pmc->idev;
1750
1751 /* no more filters for this source */
1752 if (psf_prev)
1753 psf_prev->sf_next = psf->sf_next;
1754 else
1755 pmc->mca_sources = psf->sf_next;
1756 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1757 !MLD_V1_SEEN(idev)) {
1758 psf->sf_crcount = idev->mc_qrv;
1759 psf->sf_next = pmc->mca_tomb;
1760 pmc->mca_tomb = psf;
1761 rv = 1;
1762 } else
1763 kfree(psf);
1764 }
1765 return rv;
1766}
1767
1768static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1769 int sfmode, int sfcount, struct in6_addr *psfsrc,
1770 int delta)
1771{
1772 struct ifmcaddr6 *pmc;
1773 int changerec = 0;
1774 int i, err;
1775
1776 if (!idev)
1777 return -ENODEV;
1778 read_lock_bh(&idev->lock);
1779 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1780 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1781 break;
1782 }
1783 if (!pmc) {
1784 /* MCA not found?? bug */
1785 read_unlock_bh(&idev->lock);
1786 return -ESRCH;
1787 }
1788 spin_lock_bh(&pmc->mca_lock);
1789 sf_markstate(pmc);
1790 if (!delta) {
1791 if (!pmc->mca_sfcount[sfmode]) {
1792 spin_unlock_bh(&pmc->mca_lock);
1793 read_unlock_bh(&idev->lock);
1794 return -EINVAL;
1795 }
1796 pmc->mca_sfcount[sfmode]--;
1797 }
1798 err = 0;
1799 for (i=0; i<sfcount; i++) {
1800 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1801
1802 changerec |= rv > 0;
1803 if (!err && rv < 0)
1804 err = rv;
1805 }
1806 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1807 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1808 pmc->mca_sfcount[MCAST_INCLUDE]) {
1809 struct ip6_sf_list *psf;
1810
1811 /* filter mode change */
1812 pmc->mca_sfmode = MCAST_INCLUDE;
1813 pmc->mca_crcount = idev->mc_qrv;
1814 idev->mc_ifc_count = pmc->mca_crcount;
1815 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1816 psf->sf_crcount = 0;
1817 mld_ifc_event(pmc->idev);
1818 } else if (sf_setstate(pmc) || changerec)
1819 mld_ifc_event(pmc->idev);
1820 spin_unlock_bh(&pmc->mca_lock);
1821 read_unlock_bh(&idev->lock);
1822 return err;
1823}
1824
1825/*
1826 * Add multicast single-source filter to the interface list
1827 */
1828static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1829 struct in6_addr *psfsrc, int delta)
1830{
1831 struct ip6_sf_list *psf, *psf_prev;
1832
1833 psf_prev = NULL;
1834 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1835 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1836 break;
1837 psf_prev = psf;
1838 }
1839 if (!psf) {
1840 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1841 if (!psf)
1842 return -ENOBUFS;
1843 memset(psf, 0, sizeof(*psf));
1844 psf->sf_addr = *psfsrc;
1845 if (psf_prev) {
1846 psf_prev->sf_next = psf;
1847 } else
1848 pmc->mca_sources = psf;
1849 }
1850 psf->sf_count[sfmode]++;
1851 return 0;
1852}
1853
1854static void sf_markstate(struct ifmcaddr6 *pmc)
1855{
1856 struct ip6_sf_list *psf;
1857 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1858
1859 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1860 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1861 psf->sf_oldin = mca_xcount ==
1862 psf->sf_count[MCAST_EXCLUDE] &&
1863 !psf->sf_count[MCAST_INCLUDE];
1864 } else
1865 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1866}
1867
1868static int sf_setstate(struct ifmcaddr6 *pmc)
1869{
1870 struct ip6_sf_list *psf;
1871 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1872 int qrv = pmc->idev->mc_qrv;
1873 int new_in, rv;
1874
1875 rv = 0;
1876 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1877 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1878 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1879 !psf->sf_count[MCAST_INCLUDE];
1880 } else
1881 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1882 if (new_in != psf->sf_oldin) {
1883 psf->sf_crcount = qrv;
1884 rv++;
1885 }
1886 }
1887 return rv;
1888}
1889
1890/*
1891 * Add multicast source filter list to the interface list
1892 */
1893static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
1894 int sfmode, int sfcount, struct in6_addr *psfsrc,
1895 int delta)
1896{
1897 struct ifmcaddr6 *pmc;
1898 int isexclude;
1899 int i, err;
1900
1901 if (!idev)
1902 return -ENODEV;
1903 read_lock_bh(&idev->lock);
1904 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1905 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1906 break;
1907 }
1908 if (!pmc) {
1909 /* MCA not found?? bug */
1910 read_unlock_bh(&idev->lock);
1911 return -ESRCH;
1912 }
1913 spin_lock_bh(&pmc->mca_lock);
1914
1915 sf_markstate(pmc);
1916 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
1917 if (!delta)
1918 pmc->mca_sfcount[sfmode]++;
1919 err = 0;
1920 for (i=0; i<sfcount; i++) {
1921 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1922 if (err)
1923 break;
1924 }
1925 if (err) {
1926 int j;
1927
1928 if (!delta)
1929 pmc->mca_sfcount[sfmode]--;
1930 for (j=0; j<i; j++)
1931 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1932 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1933 struct inet6_dev *idev = pmc->idev;
1934 struct ip6_sf_list *psf;
1935
1936 /* filter mode change */
1937 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1938 pmc->mca_sfmode = MCAST_EXCLUDE;
1939 else if (pmc->mca_sfcount[MCAST_INCLUDE])
1940 pmc->mca_sfmode = MCAST_INCLUDE;
1941 /* else no filters; keep old mode for reports */
1942
1943 pmc->mca_crcount = idev->mc_qrv;
1944 idev->mc_ifc_count = pmc->mca_crcount;
1945 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1946 psf->sf_crcount = 0;
1947 mld_ifc_event(idev);
1948 } else if (sf_setstate(pmc))
1949 mld_ifc_event(idev);
1950 spin_unlock_bh(&pmc->mca_lock);
1951 read_unlock_bh(&idev->lock);
1952 return err;
1953}
1954
1955static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
1956{
1957 struct ip6_sf_list *psf, *nextpsf;
1958
1959 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
1960 nextpsf = psf->sf_next;
1961 kfree(psf);
1962 }
1963 pmc->mca_tomb = NULL;
1964 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
1965 nextpsf = psf->sf_next;
1966 kfree(psf);
1967 }
1968 pmc->mca_sources = NULL;
1969 pmc->mca_sfmode = MCAST_EXCLUDE;
1970 pmc->mca_sfcount[MCAST_EXCLUDE] = 0;
1971 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
1972}
1973
1974
1975static void igmp6_join_group(struct ifmcaddr6 *ma)
1976{
1977 unsigned long delay;
1978
1979 if (ma->mca_flags & MAF_NOREPORT)
1980 return;
1981
1982 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
1983
1984 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
1985
1986 spin_lock_bh(&ma->mca_lock);
1987 if (del_timer(&ma->mca_timer)) {
1988 atomic_dec(&ma->mca_refcnt);
1989 delay = ma->mca_timer.expires - jiffies;
1990 }
1991
1992 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1993 atomic_inc(&ma->mca_refcnt);
1994 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
1995 spin_unlock_bh(&ma->mca_lock);
1996}
1997
1998static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
1999 struct inet6_dev *idev)
2000{
2001 int err;
2002
2003 if (iml->sflist == 0) {
2004 /* any-source empty exclude case */
2005 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2006 }
2007 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2008 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2009 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2010 iml->sflist = NULL;
2011 return err;
2012}
2013
2014static void igmp6_leave_group(struct ifmcaddr6 *ma)
2015{
2016 if (MLD_V1_SEEN(ma->idev)) {
2017 if (ma->mca_flags & MAF_LAST_REPORTER)
2018 igmp6_send(&ma->mca_addr, ma->idev->dev,
2019 ICMPV6_MGM_REDUCTION);
2020 } else {
2021 mld_add_delrec(ma->idev, ma);
2022 mld_ifc_event(ma->idev);
2023 }
2024}
2025
2026static void mld_gq_timer_expire(unsigned long data)
2027{
2028 struct inet6_dev *idev = (struct inet6_dev *)data;
2029
2030 idev->mc_gq_running = 0;
2031 mld_send_report(idev, NULL);
2032 __in6_dev_put(idev);
2033}
2034
2035static void mld_ifc_timer_expire(unsigned long data)
2036{
2037 struct inet6_dev *idev = (struct inet6_dev *)data;
2038
2039 mld_send_cr(idev);
2040 if (idev->mc_ifc_count) {
2041 idev->mc_ifc_count--;
2042 if (idev->mc_ifc_count)
2043 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2044 }
2045 __in6_dev_put(idev);
2046}
2047
2048static void mld_ifc_event(struct inet6_dev *idev)
2049{
2050 if (MLD_V1_SEEN(idev))
2051 return;
2052 idev->mc_ifc_count = idev->mc_qrv;
2053 mld_ifc_start_timer(idev, 1);
2054}
2055
2056
2057static void igmp6_timer_handler(unsigned long data)
2058{
2059 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2060
2061 if (MLD_V1_SEEN(ma->idev))
2062 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2063 else
2064 mld_send_report(ma->idev, ma);
2065
2066 spin_lock(&ma->mca_lock);
2067 ma->mca_flags |= MAF_LAST_REPORTER;
2068 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2069 spin_unlock(&ma->mca_lock);
2070 ma_put(ma);
2071}
2072
2073/* Device going down */
2074
2075void ipv6_mc_down(struct inet6_dev *idev)
2076{
2077 struct ifmcaddr6 *i;
2078
2079 /* Withdraw multicast list */
2080
2081 read_lock_bh(&idev->lock);
2082 idev->mc_ifc_count = 0;
2083 if (del_timer(&idev->mc_ifc_timer))
2084 __in6_dev_put(idev);
2085 idev->mc_gq_running = 0;
2086 if (del_timer(&idev->mc_gq_timer))
2087 __in6_dev_put(idev);
2088
2089 for (i = idev->mc_list; i; i=i->next)
2090 igmp6_group_dropped(i);
2091 read_unlock_bh(&idev->lock);
2092
2093 mld_clear_delrec(idev);
2094}
2095
2096
2097/* Device going up */
2098
2099void ipv6_mc_up(struct inet6_dev *idev)
2100{
2101 struct ifmcaddr6 *i;
2102
2103 /* Install multicast list, except for all-nodes (already installed) */
2104
2105 read_lock_bh(&idev->lock);
2106 for (i = idev->mc_list; i; i=i->next)
2107 igmp6_group_added(i);
2108 read_unlock_bh(&idev->lock);
2109}
2110
2111/* IPv6 device initialization. */
2112
2113void ipv6_mc_init_dev(struct inet6_dev *idev)
2114{
2115 struct in6_addr maddr;
2116
2117 write_lock_bh(&idev->lock);
2118 rwlock_init(&idev->mc_lock);
2119 idev->mc_gq_running = 0;
2120 init_timer(&idev->mc_gq_timer);
2121 idev->mc_gq_timer.data = (unsigned long) idev;
2122 idev->mc_gq_timer.function = &mld_gq_timer_expire;
2123 idev->mc_tomb = NULL;
2124 idev->mc_ifc_count = 0;
2125 init_timer(&idev->mc_ifc_timer);
2126 idev->mc_ifc_timer.data = (unsigned long) idev;
2127 idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2128 idev->mc_qrv = MLD_QRV_DEFAULT;
2129 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2130 idev->mc_v1_seen = 0;
2131 write_unlock_bh(&idev->lock);
2132
2133 /* Add all-nodes address. */
2134 ipv6_addr_all_nodes(&maddr);
2135 ipv6_dev_mc_inc(idev->dev, &maddr);
2136}
2137
2138/*
2139 * Device is about to be destroyed: clean up.
2140 */
2141
2142void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2143{
2144 struct ifmcaddr6 *i;
2145 struct in6_addr maddr;
2146
2147 /* Deactivate timers */
2148 ipv6_mc_down(idev);
2149
2150 /* Delete all-nodes address. */
2151 ipv6_addr_all_nodes(&maddr);
2152
2153 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2154 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2155 * fail.
2156 */
2157 __ipv6_dev_mc_dec(idev, &maddr);
2158
2159 if (idev->cnf.forwarding) {
2160 ipv6_addr_all_routers(&maddr);
2161 __ipv6_dev_mc_dec(idev, &maddr);
2162 }
2163
2164 write_lock_bh(&idev->lock);
2165 while ((i = idev->mc_list) != NULL) {
2166 idev->mc_list = i->next;
2167 write_unlock_bh(&idev->lock);
2168
2169 igmp6_group_dropped(i);
2170 ma_put(i);
2171
2172 write_lock_bh(&idev->lock);
2173 }
2174 write_unlock_bh(&idev->lock);
2175}
2176
2177#ifdef CONFIG_PROC_FS
2178struct igmp6_mc_iter_state {
2179 struct net_device *dev;
2180 struct inet6_dev *idev;
2181};
2182
2183#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2184
2185static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2186{
2187 struct ifmcaddr6 *im = NULL;
2188 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2189
2190 for (state->dev = dev_base, state->idev = NULL;
2191 state->dev;
2192 state->dev = state->dev->next) {
2193 struct inet6_dev *idev;
2194 idev = in6_dev_get(state->dev);
2195 if (!idev)
2196 continue;
2197 read_lock_bh(&idev->lock);
2198 im = idev->mc_list;
2199 if (im) {
2200 state->idev = idev;
2201 break;
2202 }
2203 read_unlock_bh(&idev->lock);
2204 in6_dev_put(idev);
2205 }
2206 return im;
2207}
2208
2209static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2210{
2211 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2212
2213 im = im->next;
2214 while (!im) {
2215 if (likely(state->idev != NULL)) {
2216 read_unlock_bh(&state->idev->lock);
2217 in6_dev_put(state->idev);
2218 }
2219 state->dev = state->dev->next;
2220 if (!state->dev) {
2221 state->idev = NULL;
2222 break;
2223 }
2224 state->idev = in6_dev_get(state->dev);
2225 if (!state->idev)
2226 continue;
2227 read_lock_bh(&state->idev->lock);
2228 im = state->idev->mc_list;
2229 }
2230 return im;
2231}
2232
2233static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2234{
2235 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2236 if (im)
2237 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2238 --pos;
2239 return pos ? NULL : im;
2240}
2241
2242static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2243{
2244 read_lock(&dev_base_lock);
2245 return igmp6_mc_get_idx(seq, *pos);
2246}
2247
2248static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2249{
2250 struct ifmcaddr6 *im;
2251 im = igmp6_mc_get_next(seq, v);
2252 ++*pos;
2253 return im;
2254}
2255
2256static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2257{
2258 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2259 if (likely(state->idev != NULL)) {
2260 read_unlock_bh(&state->idev->lock);
2261 in6_dev_put(state->idev);
2262 state->idev = NULL;
2263 }
2264 state->dev = NULL;
2265 read_unlock(&dev_base_lock);
2266}
2267
2268static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2269{
2270 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2271 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2272
2273 seq_printf(seq,
2274 "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n",
2275 state->dev->ifindex, state->dev->name,
2276 NIP6(im->mca_addr),
2277 im->mca_users, im->mca_flags,
2278 (im->mca_flags&MAF_TIMER_RUNNING) ?
2279 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2280 return 0;
2281}
2282
2283static struct seq_operations igmp6_mc_seq_ops = {
2284 .start = igmp6_mc_seq_start,
2285 .next = igmp6_mc_seq_next,
2286 .stop = igmp6_mc_seq_stop,
2287 .show = igmp6_mc_seq_show,
2288};
2289
2290static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2291{
2292 struct seq_file *seq;
2293 int rc = -ENOMEM;
2294 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2295
2296 if (!s)
2297 goto out;
2298
2299 rc = seq_open(file, &igmp6_mc_seq_ops);
2300 if (rc)
2301 goto out_kfree;
2302
2303 seq = file->private_data;
2304 seq->private = s;
2305 memset(s, 0, sizeof(*s));
2306out:
2307 return rc;
2308out_kfree:
2309 kfree(s);
2310 goto out;
2311}
2312
2313static struct file_operations igmp6_mc_seq_fops = {
2314 .owner = THIS_MODULE,
2315 .open = igmp6_mc_seq_open,
2316 .read = seq_read,
2317 .llseek = seq_lseek,
2318 .release = seq_release_private,
2319};
2320
2321struct igmp6_mcf_iter_state {
2322 struct net_device *dev;
2323 struct inet6_dev *idev;
2324 struct ifmcaddr6 *im;
2325};
2326
2327#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2328
2329static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2330{
2331 struct ip6_sf_list *psf = NULL;
2332 struct ifmcaddr6 *im = NULL;
2333 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2334
2335 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2336 state->dev;
2337 state->dev = state->dev->next) {
2338 struct inet6_dev *idev;
2339 idev = in6_dev_get(state->dev);
2340 if (unlikely(idev == NULL))
2341 continue;
2342 read_lock_bh(&idev->lock);
2343 im = idev->mc_list;
2344 if (likely(im != NULL)) {
2345 spin_lock_bh(&im->mca_lock);
2346 psf = im->mca_sources;
2347 if (likely(psf != NULL)) {
2348 state->im = im;
2349 state->idev = idev;
2350 break;
2351 }
2352 spin_unlock_bh(&im->mca_lock);
2353 }
2354 read_unlock_bh(&idev->lock);
2355 in6_dev_put(idev);
2356 }
2357 return psf;
2358}
2359
2360static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2361{
2362 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2363
2364 psf = psf->sf_next;
2365 while (!psf) {
2366 spin_unlock_bh(&state->im->mca_lock);
2367 state->im = state->im->next;
2368 while (!state->im) {
2369 if (likely(state->idev != NULL)) {
2370 read_unlock_bh(&state->idev->lock);
2371 in6_dev_put(state->idev);
2372 }
2373 state->dev = state->dev->next;
2374 if (!state->dev) {
2375 state->idev = NULL;
2376 goto out;
2377 }
2378 state->idev = in6_dev_get(state->dev);
2379 if (!state->idev)
2380 continue;
2381 read_lock_bh(&state->idev->lock);
2382 state->im = state->idev->mc_list;
2383 }
2384 if (!state->im)
2385 break;
2386 spin_lock_bh(&state->im->mca_lock);
2387 psf = state->im->mca_sources;
2388 }
2389out:
2390 return psf;
2391}
2392
2393static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2394{
2395 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2396 if (psf)
2397 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2398 --pos;
2399 return pos ? NULL : psf;
2400}
2401
2402static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2403{
2404 read_lock(&dev_base_lock);
2405 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2406}
2407
2408static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2409{
2410 struct ip6_sf_list *psf;
2411 if (v == SEQ_START_TOKEN)
2412 psf = igmp6_mcf_get_first(seq);
2413 else
2414 psf = igmp6_mcf_get_next(seq, v);
2415 ++*pos;
2416 return psf;
2417}
2418
2419static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2420{
2421 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2422 if (likely(state->im != NULL)) {
2423 spin_unlock_bh(&state->im->mca_lock);
2424 state->im = NULL;
2425 }
2426 if (likely(state->idev != NULL)) {
2427 read_unlock_bh(&state->idev->lock);
2428 in6_dev_put(state->idev);
2429 state->idev = NULL;
2430 }
2431 state->dev = NULL;
2432 read_unlock(&dev_base_lock);
2433}
2434
2435static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2436{
2437 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2438 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2439
2440 if (v == SEQ_START_TOKEN) {
2441 seq_printf(seq,
2442 "%3s %6s "
2443 "%32s %32s %6s %6s\n", "Idx",
2444 "Device", "Multicast Address",
2445 "Source Address", "INC", "EXC");
2446 } else {
2447 seq_printf(seq,
2448 "%3d %6.6s "
2449 "%04x%04x%04x%04x%04x%04x%04x%04x "
2450 "%04x%04x%04x%04x%04x%04x%04x%04x "
2451 "%6lu %6lu\n",
2452 state->dev->ifindex, state->dev->name,
2453 NIP6(state->im->mca_addr),
2454 NIP6(psf->sf_addr),
2455 psf->sf_count[MCAST_INCLUDE],
2456 psf->sf_count[MCAST_EXCLUDE]);
2457 }
2458 return 0;
2459}
2460
2461static struct seq_operations igmp6_mcf_seq_ops = {
2462 .start = igmp6_mcf_seq_start,
2463 .next = igmp6_mcf_seq_next,
2464 .stop = igmp6_mcf_seq_stop,
2465 .show = igmp6_mcf_seq_show,
2466};
2467
2468static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2469{
2470 struct seq_file *seq;
2471 int rc = -ENOMEM;
2472 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2473
2474 if (!s)
2475 goto out;
2476
2477 rc = seq_open(file, &igmp6_mcf_seq_ops);
2478 if (rc)
2479 goto out_kfree;
2480
2481 seq = file->private_data;
2482 seq->private = s;
2483 memset(s, 0, sizeof(*s));
2484out:
2485 return rc;
2486out_kfree:
2487 kfree(s);
2488 goto out;
2489}
2490
2491static struct file_operations igmp6_mcf_seq_fops = {
2492 .owner = THIS_MODULE,
2493 .open = igmp6_mcf_seq_open,
2494 .read = seq_read,
2495 .llseek = seq_lseek,
2496 .release = seq_release_private,
2497};
2498#endif
2499
2500int __init igmp6_init(struct net_proto_family *ops)
2501{
2502 struct ipv6_pinfo *np;
2503 struct sock *sk;
2504 int err;
2505
2506 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2507 if (err < 0) {
2508 printk(KERN_ERR
2509 "Failed to initialize the IGMP6 control socket (err %d).\n",
2510 err);
2511 igmp6_socket = NULL; /* For safety. */
2512 return err;
2513 }
2514
2515 sk = igmp6_socket->sk;
2516 sk->sk_allocation = GFP_ATOMIC;
2517 sk->sk_prot->unhash(sk);
2518
2519 np = inet6_sk(sk);
2520 np->hop_limit = 1;
2521
2522#ifdef CONFIG_PROC_FS
2523 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2524 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2525#endif
2526
2527 return 0;
2528}
2529
2530void igmp6_cleanup(void)
2531{
2532 sock_release(igmp6_socket);
2533 igmp6_socket = NULL; /* for safety */
2534
2535#ifdef CONFIG_PROC_FS
2536 proc_net_remove("mcfilter6");
2537 proc_net_remove("igmp6");
2538#endif
2539}
Clone of davem's net-next-2.6 tree