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[SCTP]: Fix getsockname for sctp when an ipv6 socket accepts a connection from
[net-next-2.6.git] / net / ipv6 / mcast.c
CommitLineData
1da177e4
LT		 1/*
2 * Multicast support for IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
9 *
10 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17
18/* Changes:
19 *
20 * yoshfuji : fix format of router-alert option
21 * YOSHIFUJI Hideaki @USAGI:
22 * Fixed source address for MLD message based on
23 * <draft-ietf-magma-mld-source-05.txt>.
24 * YOSHIFUJI Hideaki @USAGI:
25 * - Ignore Queries for invalid addresses.
26 * - MLD for link-local addresses.
27 * David L Stevens <dlstevens@us.ibm.com>:
28 * - MLDv2 support
29 */
30
31#include <linux/config.h>
32#include <linux/module.h>
33#include <linux/errno.h>
34#include <linux/types.h>
35#include <linux/string.h>
36#include <linux/socket.h>
37#include <linux/sockios.h>
38#include <linux/jiffies.h>
39#include <linux/times.h>
40#include <linux/net.h>
41#include <linux/in.h>
42#include <linux/in6.h>
43#include <linux/netdevice.h>
44#include <linux/if_arp.h>
45#include <linux/route.h>
46#include <linux/init.h>
47#include <linux/proc_fs.h>
48#include <linux/seq_file.h>
49
50#include <linux/netfilter.h>
51#include <linux/netfilter_ipv6.h>
52
53#include <net/sock.h>
54#include <net/snmp.h>
55
56#include <net/ipv6.h>
57#include <net/protocol.h>
58#include <net/if_inet6.h>
59#include <net/ndisc.h>
60#include <net/addrconf.h>
61#include <net/ip6_route.h>
62
63#include <net/ip6_checksum.h>
64
65/* Set to 3 to get tracing... */
66#define MCAST_DEBUG 2
67
68#if MCAST_DEBUG >= 3
69#define MDBG(x) printk x
70#else
71#define MDBG(x)
72#endif
73
74/*
75 * These header formats should be in a separate include file, but icmpv6.h
76 * doesn't have in6_addr defined in all cases, there is no __u128, and no
77 * other files reference these.
78 *
79 * +-DLS 4/14/03
80 */
81
82/* Multicast Listener Discovery version 2 headers */
83
84struct mld2_grec {
85 __u8 grec_type;
86 __u8 grec_auxwords;
87 __u16 grec_nsrcs;
88 struct in6_addr grec_mca;
89 struct in6_addr grec_src[0];
90};
91
92struct mld2_report {
93 __u8 type;
94 __u8 resv1;
95 __u16 csum;
96 __u16 resv2;
97 __u16 ngrec;
98 struct mld2_grec grec[0];
99};
100
101struct mld2_query {
102 __u8 type;
103 __u8 code;
104 __u16 csum;
105 __u16 mrc;
106 __u16 resv1;
107 struct in6_addr mca;
108#if defined(__LITTLE_ENDIAN_BITFIELD)
109 __u8 qrv:3,
110 suppress:1,
111 resv2:4;
112#elif defined(__BIG_ENDIAN_BITFIELD)
113 __u8 resv2:4,
114 suppress:1,
115 qrv:3;
116#else
117#error "Please fix <asm/byteorder.h>"
118#endif
119 __u8 qqic;
120 __u16 nsrcs;
121 struct in6_addr srcs[0];
122};
123
124static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
125
126/* Big mc list lock for all the sockets */
127static DEFINE_RWLOCK(ipv6_sk_mc_lock);
128
129static struct socket *igmp6_socket;
130
131int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
132
133static void igmp6_join_group(struct ifmcaddr6 *ma);
134static void igmp6_leave_group(struct ifmcaddr6 *ma);
135static void igmp6_timer_handler(unsigned long data);
136
137static void mld_gq_timer_expire(unsigned long data);
138static void mld_ifc_timer_expire(unsigned long data);
139static void mld_ifc_event(struct inet6_dev *idev);
140static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
141static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
142static void mld_clear_delrec(struct inet6_dev *idev);
143static int sf_setstate(struct ifmcaddr6 *pmc);
144static void sf_markstate(struct ifmcaddr6 *pmc);
145static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
146static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
147 int sfmode, int sfcount, struct in6_addr *psfsrc,
148 int delta);
149static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
150 int sfmode, int sfcount, struct in6_addr *psfsrc,
151 int delta);
152static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
153 struct inet6_dev *idev);
154
155
156#define IGMP6_UNSOLICITED_IVAL (10*HZ)
157#define MLD_QRV_DEFAULT 2
158
159#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
160 (idev)->cnf.force_mld_version == 1 || \
161 ((idev)->mc_v1_seen && \
162 time_before(jiffies, (idev)->mc_v1_seen)))
163
164#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
165#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
166 ((value) < (thresh) ? (value) : \
f12baeab 167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
1da177e4
LT		 168 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
169
170#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
171#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
172
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
9c05989b 512 err = 0;
9951f036
DS		 513 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
514 leavegroup = 1;
515 goto done;
516 }
517
1da177e4
LT		 518 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
519 if (pmc->ifindex != gsf->gf_interface)
520 continue;
521 if (ipv6_addr_equal(&pmc->addr, group))
522 break;
523 }
917f2f10
DS		 524 if (!pmc) { /* must have a prior join */
525 err = -EINVAL;
1da177e4 526 goto done;
917f2f10 527 }
1da177e4
LT		 528 if (gsf->gf_numsrc) {
529 newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
530 IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
531 if (!newpsl) {
532 err = -ENOBUFS;
533 goto done;
534 }
535 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
536 for (i=0; i<newpsl->sl_count; ++i) {
537 struct sockaddr_in6 *psin6;
538
539 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
540 newpsl->sl_addr[i] = psin6->sin6_addr;
541 }
542 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
543 newpsl->sl_count, newpsl->sl_addr, 0);
544 if (err) {
545 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
546 goto done;
547 }
8713dbf0 548 } else {
1da177e4 549 newpsl = NULL;
8713dbf0
YZ		 550 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
551 }
1da177e4
LT		 552 psl = pmc->sflist;
553 if (psl) {
554 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
555 psl->sl_count, psl->sl_addr, 0);
556 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
557 } else
558 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
559 pmc->sflist = newpsl;
560 pmc->sfmode = gsf->gf_fmode;
917f2f10 561 err = 0;
1da177e4
LT		 562done:
563 read_unlock_bh(&idev->lock);
564 in6_dev_put(idev);
565 dev_put(dev);
9951f036
DS		 566 if (leavegroup)
567 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
1da177e4
LT		 568 return err;
569}
570
571int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
572 struct group_filter __user *optval, int __user *optlen)
573{
574 int err, i, count, copycount;
575 struct in6_addr *group;
576 struct ipv6_mc_socklist *pmc;
577 struct inet6_dev *idev;
578 struct net_device *dev;
579 struct ipv6_pinfo *inet6 = inet6_sk(sk);
580 struct ip6_sf_socklist *psl;
581
582 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
583
584 if (!ipv6_addr_is_multicast(group))
585 return -EINVAL;
586
587 idev = ip6_mc_find_dev(group, gsf->gf_interface);
588
589 if (!idev)
590 return -ENODEV;
591
592 dev = idev->dev;
593
594 err = -EADDRNOTAVAIL;
595
596 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
597 if (pmc->ifindex != gsf->gf_interface)
598 continue;
599 if (ipv6_addr_equal(group, &pmc->addr))
600 break;
601 }
602 if (!pmc) /* must have a prior join */
603 goto done;
604 gsf->gf_fmode = pmc->sfmode;
605 psl = pmc->sflist;
606 count = psl ? psl->sl_count : 0;
607 read_unlock_bh(&idev->lock);
608 in6_dev_put(idev);
609 dev_put(dev);
610
611 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
612 gsf->gf_numsrc = count;
613 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
614 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
615 return -EFAULT;
616 }
617 for (i=0; i<copycount; i++) {
618 struct sockaddr_in6 *psin6;
619 struct sockaddr_storage ss;
620
621 psin6 = (struct sockaddr_in6 *)&ss;
622 memset(&ss, 0, sizeof(ss));
623 psin6->sin6_family = AF_INET6;
624 psin6->sin6_addr = psl->sl_addr[i];
625 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
626 return -EFAULT;
627 }
628 return 0;
629done:
630 read_unlock_bh(&idev->lock);
631 in6_dev_put(idev);
632 dev_put(dev);
633 return err;
634}
635
636int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
637 struct in6_addr *src_addr)
638{
639 struct ipv6_pinfo *np = inet6_sk(sk);
640 struct ipv6_mc_socklist *mc;
641 struct ip6_sf_socklist *psl;
642 int rv = 1;
643
644 read_lock(&ipv6_sk_mc_lock);
645 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
646 if (ipv6_addr_equal(&mc->addr, mc_addr))
647 break;
648 }
649 if (!mc) {
650 read_unlock(&ipv6_sk_mc_lock);
651 return 1;
652 }
653 psl = mc->sflist;
654 if (!psl) {
655 rv = mc->sfmode == MCAST_EXCLUDE;
656 } else {
657 int i;
658
659 for (i=0; i<psl->sl_count; i++) {
660 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
661 break;
662 }
663 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
664 rv = 0;
665 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
666 rv = 0;
667 }
668 read_unlock(&ipv6_sk_mc_lock);
669
670 return rv;
671}
672
673static void ma_put(struct ifmcaddr6 *mc)
674{
675 if (atomic_dec_and_test(&mc->mca_refcnt)) {
676 in6_dev_put(mc->idev);
677 kfree(mc);
678 }
679}
680
681static void igmp6_group_added(struct ifmcaddr6 *mc)
682{
683 struct net_device *dev = mc->idev->dev;
684 char buf[MAX_ADDR_LEN];
685
686 spin_lock_bh(&mc->mca_lock);
687 if (!(mc->mca_flags&MAF_LOADED)) {
688 mc->mca_flags |= MAF_LOADED;
689 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
690 dev_mc_add(dev, buf, dev->addr_len, 0);
691 }
692 spin_unlock_bh(&mc->mca_lock);
693
694 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
695 return;
696
697 if (MLD_V1_SEEN(mc->idev)) {
698 igmp6_join_group(mc);
699 return;
700 }
701 /* else v2 */
702
703 mc->mca_crcount = mc->idev->mc_qrv;
704 mld_ifc_event(mc->idev);
705}
706
707static void igmp6_group_dropped(struct ifmcaddr6 *mc)
708{
709 struct net_device *dev = mc->idev->dev;
710 char buf[MAX_ADDR_LEN];
711
712 spin_lock_bh(&mc->mca_lock);
713 if (mc->mca_flags&MAF_LOADED) {
714 mc->mca_flags &= ~MAF_LOADED;
715 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
716 dev_mc_delete(dev, buf, dev->addr_len, 0);
717 }
718
719 if (mc->mca_flags & MAF_NOREPORT)
720 goto done;
721 spin_unlock_bh(&mc->mca_lock);
722
723 if (!mc->idev->dead)
724 igmp6_leave_group(mc);
725
726 spin_lock_bh(&mc->mca_lock);
727 if (del_timer(&mc->mca_timer))
728 atomic_dec(&mc->mca_refcnt);
729done:
730 ip6_mc_clear_src(mc);
731 spin_unlock_bh(&mc->mca_lock);
732}
733
734/*
735 * deleted ifmcaddr6 manipulation
736 */
737static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
738{
739 struct ifmcaddr6 *pmc;
740
741 /* this is an "ifmcaddr6" for convenience; only the fields below
742 * are actually used. In particular, the refcnt and users are not
743 * used for management of the delete list. Using the same structure
744 * for deleted items allows change reports to use common code with
745 * non-deleted or query-response MCA's.
746 */
747 pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
748 if (!pmc)
749 return;
750 memset(pmc, 0, sizeof(*pmc));
751 spin_lock_bh(&im->mca_lock);
752 spin_lock_init(&pmc->mca_lock);
753 pmc->idev = im->idev;
754 in6_dev_hold(idev);
755 pmc->mca_addr = im->mca_addr;
756 pmc->mca_crcount = idev->mc_qrv;
757 pmc->mca_sfmode = im->mca_sfmode;
758 if (pmc->mca_sfmode == MCAST_INCLUDE) {
759 struct ip6_sf_list *psf;
760
761 pmc->mca_tomb = im->mca_tomb;
762 pmc->mca_sources = im->mca_sources;
763 im->mca_tomb = im->mca_sources = NULL;
764 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
765 psf->sf_crcount = pmc->mca_crcount;
766 }
767 spin_unlock_bh(&im->mca_lock);
768
769 write_lock_bh(&idev->mc_lock);
770 pmc->next = idev->mc_tomb;
771 idev->mc_tomb = pmc;
772 write_unlock_bh(&idev->mc_lock);
773}
774
775static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
776{
777 struct ifmcaddr6 *pmc, *pmc_prev;
778 struct ip6_sf_list *psf, *psf_next;
779
780 write_lock_bh(&idev->mc_lock);
781 pmc_prev = NULL;
782 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
783 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
784 break;
785 pmc_prev = pmc;
786 }
787 if (pmc) {
788 if (pmc_prev)
789 pmc_prev->next = pmc->next;
790 else
791 idev->mc_tomb = pmc->next;
792 }
793 write_unlock_bh(&idev->mc_lock);
794 if (pmc) {
795 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
796 psf_next = psf->sf_next;
797 kfree(psf);
798 }
799 in6_dev_put(pmc->idev);
800 kfree(pmc);
801 }
802}
803
804static void mld_clear_delrec(struct inet6_dev *idev)
805{
806 struct ifmcaddr6 *pmc, *nextpmc;
807
808 write_lock_bh(&idev->mc_lock);
809 pmc = idev->mc_tomb;
810 idev->mc_tomb = NULL;
811 write_unlock_bh(&idev->mc_lock);
812
813 for (; pmc; pmc = nextpmc) {
814 nextpmc = pmc->next;
815 ip6_mc_clear_src(pmc);
816 in6_dev_put(pmc->idev);
817 kfree(pmc);
818 }
819
820 /* clear dead sources, too */
821 read_lock_bh(&idev->lock);
822 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
823 struct ip6_sf_list *psf, *psf_next;
824
825 spin_lock_bh(&pmc->mca_lock);
826 psf = pmc->mca_tomb;
827 pmc->mca_tomb = NULL;
828 spin_unlock_bh(&pmc->mca_lock);
829 for (; psf; psf=psf_next) {
830 psf_next = psf->sf_next;
831 kfree(psf);
832 }
833 }
834 read_unlock_bh(&idev->lock);
835}
836
837
838/*
839 * device multicast group inc (add if not found)
840 */
841int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
842{
843 struct ifmcaddr6 *mc;
844 struct inet6_dev *idev;
845
846 idev = in6_dev_get(dev);
847
848 if (idev == NULL)
849 return -EINVAL;
850
851 write_lock_bh(&idev->lock);
852 if (idev->dead) {
853 write_unlock_bh(&idev->lock);
854 in6_dev_put(idev);
855 return -ENODEV;
856 }
857
858 for (mc = idev->mc_list; mc; mc = mc->next) {
859 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
860 mc->mca_users++;
861 write_unlock_bh(&idev->lock);
862 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
863 NULL, 0);
864 in6_dev_put(idev);
865 return 0;
866 }
867 }
868
869 /*
870 * not found: create a new one.
871 */
872
873 mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
874
875 if (mc == NULL) {
876 write_unlock_bh(&idev->lock);
877 in6_dev_put(idev);
878 return -ENOMEM;
879 }
880
881 memset(mc, 0, sizeof(struct ifmcaddr6));
882 init_timer(&mc->mca_timer);
883 mc->mca_timer.function = igmp6_timer_handler;
884 mc->mca_timer.data = (unsigned long) mc;
885
886 ipv6_addr_copy(&mc->mca_addr, addr);
887 mc->idev = idev;
888 mc->mca_users = 1;
889 /* mca_stamp should be updated upon changes */
890 mc->mca_cstamp = mc->mca_tstamp = jiffies;
891 atomic_set(&mc->mca_refcnt, 2);
892 spin_lock_init(&mc->mca_lock);
893
894 /* initial mode is (EX, empty) */
895 mc->mca_sfmode = MCAST_EXCLUDE;
896 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
897
898 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
899 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
900 mc->mca_flags |= MAF_NOREPORT;
901
902 mc->next = idev->mc_list;
903 idev->mc_list = mc;
904 write_unlock_bh(&idev->lock);
905
906 mld_del_delrec(idev, &mc->mca_addr);
907 igmp6_group_added(mc);
908 ma_put(mc);
909 return 0;
910}
911
912/*
913 * device multicast group del
914 */
915int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
916{
917 struct ifmcaddr6 *ma, **map;
918
919 write_lock_bh(&idev->lock);
920 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
921 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
922 if (--ma->mca_users == 0) {
923 *map = ma->next;
924 write_unlock_bh(&idev->lock);
925
926 igmp6_group_dropped(ma);
927
928 ma_put(ma);
929 return 0;
930 }
931 write_unlock_bh(&idev->lock);
932 return 0;
933 }
934 }
935 write_unlock_bh(&idev->lock);
936
937 return -ENOENT;
938}
939
940int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
941{
942 struct inet6_dev *idev = in6_dev_get(dev);
943 int err;
944
945 if (!idev)
946 return -ENODEV;
947
948 err = __ipv6_dev_mc_dec(idev, addr);
949
950 in6_dev_put(idev);
951
952 return err;
953}
954
955/*
956 * identify MLD packets for MLD filter exceptions
957 */
958int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
959{
960 struct icmp6hdr *pic;
961
962 if (nexthdr != IPPROTO_ICMPV6)
963 return 0;
964
965 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
966 return 0;
967
968 pic = (struct icmp6hdr *)skb->h.raw;
969
970 switch (pic->icmp6_type) {
971 case ICMPV6_MGM_QUERY:
972 case ICMPV6_MGM_REPORT:
973 case ICMPV6_MGM_REDUCTION:
974 case ICMPV6_MLD2_REPORT:
975 return 1;
976 default:
977 break;
978 }
979 return 0;
980}
981
982/*
983 * check if the interface/address pair is valid
984 */
985int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
986 struct in6_addr *src_addr)
987{
988 struct inet6_dev *idev;
989 struct ifmcaddr6 *mc;
990 int rv = 0;
991
992 idev = in6_dev_get(dev);
993 if (idev) {
994 read_lock_bh(&idev->lock);
995 for (mc = idev->mc_list; mc; mc=mc->next) {
996 if (ipv6_addr_equal(&mc->mca_addr, group))
997 break;
998 }
999 if (mc) {
1000 if (src_addr && !ipv6_addr_any(src_addr)) {
1001 struct ip6_sf_list *psf;
1002
1003 spin_lock_bh(&mc->mca_lock);
1004 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1005 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1006 break;
1007 }
1008 if (psf)
1009 rv = psf->sf_count[MCAST_INCLUDE] ||
1010 psf->sf_count[MCAST_EXCLUDE] !=
1011 mc->mca_sfcount[MCAST_EXCLUDE];
1012 else
1013 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1014 spin_unlock_bh(&mc->mca_lock);
1015 } else
1016 rv = 1; /* don't filter unspecified source */
1017 }
1018 read_unlock_bh(&idev->lock);
1019 in6_dev_put(idev);
1020 }
1021 return rv;
1022}
1023
1024static void mld_gq_start_timer(struct inet6_dev *idev)
1025{
1026 int tv = net_random() % idev->mc_maxdelay;
1027
1028 idev->mc_gq_running = 1;
1029 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1030 in6_dev_hold(idev);
1031}
1032
1033static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1034{
1035 int tv = net_random() % delay;
1036
1037 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1038 in6_dev_hold(idev);
1039}
1040
1041/*
1042 * IGMP handling (alias multicast ICMPv6 messages)
1043 */
1044
1045static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1046{
1047 unsigned long delay = resptime;
1048
1049 /* Do not start timer for these addresses */
1050 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1051 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1052 return;
1053
1054 if (del_timer(&ma->mca_timer)) {
1055 atomic_dec(&ma->mca_refcnt);
1056 delay = ma->mca_timer.expires - jiffies;
1057 }
1058
1059 if (delay >= resptime) {
1060 if (resptime)
1061 delay = net_random() % resptime;
1062 else
1063 delay = 1;
1064 }
1065 ma->mca_timer.expires = jiffies + delay;
1066 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1067 atomic_inc(&ma->mca_refcnt);
1068 ma->mca_flags |= MAF_TIMER_RUNNING;
1069}
1070
1071static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1072 struct in6_addr *srcs)
1073{
1074 struct ip6_sf_list *psf;
1075 int i, scount;
1076
1077 scount = 0;
1078 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1079 if (scount == nsrcs)
1080 break;
1081 for (i=0; i<nsrcs; i++)
1082 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1083 psf->sf_gsresp = 1;
1084 scount++;
1085 break;
1086 }
1087 }
1088}
1089
1090int igmp6_event_query(struct sk_buff *skb)
1091{
97300b5f 1092 struct mld2_query *mlh2 = NULL;
1da177e4
LT		 1093 struct ifmcaddr6 *ma;
1094 struct in6_addr *group;
1095 unsigned long max_delay;
1096 struct inet6_dev *idev;
1097 struct icmp6hdr *hdr;
1098 int group_type;
1099 int mark = 0;
1100 int len;
1101
1102 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1103 return -EINVAL;
1104
1105 /* compute payload length excluding extension headers */
1106 len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
1107 len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h;
1108
1109 /* Drop queries with not link local source */
1110 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
1111 return -EINVAL;
1112
1113 idev = in6_dev_get(skb->dev);
1114
1115 if (idev == NULL)
1116 return 0;
1117
1118 hdr = (struct icmp6hdr *) skb->h.raw;
1119 group = (struct in6_addr *) (hdr + 1);
1120 group_type = ipv6_addr_type(group);
1121
1122 if (group_type != IPV6_ADDR_ANY &&
1123 !(group_type&IPV6_ADDR_MULTICAST)) {
1124 in6_dev_put(idev);
1125 return -EINVAL;
1126 }
1127
1128 if (len == 24) {
1129 int switchback;
1130 /* MLDv1 router present */
1131
1132 /* Translate milliseconds to jiffies */
1133 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1134
1135 switchback = (idev->mc_qrv + 1) * max_delay;
1136 idev->mc_v1_seen = jiffies + switchback;
1137
1138 /* cancel the interface change timer */
1139 idev->mc_ifc_count = 0;
1140 if (del_timer(&idev->mc_ifc_timer))
1141 __in6_dev_put(idev);
1142 /* clear deleted report items */
1143 mld_clear_delrec(idev);
1144 } else if (len >= 28) {
97300b5f
YZ		 1145 int srcs_offset = sizeof(struct mld2_query) -
1146 sizeof(struct icmp6hdr);
1147 if (!pskb_may_pull(skb, srcs_offset)) {
1148 in6_dev_put(idev);
1149 return -EINVAL;
1150 }
1151 mlh2 = (struct mld2_query *) skb->h.raw;
1da177e4
LT		 1152 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1153 if (!max_delay)
1154 max_delay = 1;
1155 idev->mc_maxdelay = max_delay;
1156 if (mlh2->qrv)
1157 idev->mc_qrv = mlh2->qrv;
1158 if (group_type == IPV6_ADDR_ANY) { /* general query */
1159 if (mlh2->nsrcs) {
1160 in6_dev_put(idev);
1161 return -EINVAL; /* no sources allowed */
1162 }
1163 mld_gq_start_timer(idev);
1164 in6_dev_put(idev);
1165 return 0;
1166 }
1167 /* mark sources to include, if group & source-specific */
97300b5f
YZ		 1168 if (mlh2->nsrcs != 0) {
1169 if (!pskb_may_pull(skb, srcs_offset +
1170 mlh2->nsrcs * sizeof(struct in6_addr))) {
1171 in6_dev_put(idev);
1172 return -EINVAL;
1173 }
1174 mlh2 = (struct mld2_query *) skb->h.raw;
1175 mark = 1;
1176 }
1da177e4
LT		 1177 } else {
1178 in6_dev_put(idev);
1179 return -EINVAL;
1180 }
1181
1182 read_lock_bh(&idev->lock);
1183 if (group_type == IPV6_ADDR_ANY) {
1184 for (ma = idev->mc_list; ma; ma=ma->next) {
1185 spin_lock_bh(&ma->mca_lock);
1186 igmp6_group_queried(ma, max_delay);
1187 spin_unlock_bh(&ma->mca_lock);
1188 }
1189 } else {
1190 for (ma = idev->mc_list; ma; ma=ma->next) {
1191 if (group_type != IPV6_ADDR_ANY &&
1192 !ipv6_addr_equal(group, &ma->mca_addr))
1193 continue;
1194 spin_lock_bh(&ma->mca_lock);
1195 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1196 /* gsquery <- gsquery && mark */
1197 if (!mark)
1198 ma->mca_flags &= ~MAF_GSQUERY;
1199 } else {
1200 /* gsquery <- mark */
1201 if (mark)
1202 ma->mca_flags |= MAF_GSQUERY;
1203 else
1204 ma->mca_flags &= ~MAF_GSQUERY;
1205 }
1206 if (ma->mca_flags & MAF_GSQUERY)
1207 mld_marksources(ma, ntohs(mlh2->nsrcs),
1208 mlh2->srcs);
1209 igmp6_group_queried(ma, max_delay);
1210 spin_unlock_bh(&ma->mca_lock);
1211 if (group_type != IPV6_ADDR_ANY)
1212 break;
1213 }
1214 }
1215 read_unlock_bh(&idev->lock);
1216 in6_dev_put(idev);
1217
1218 return 0;
1219}
1220
1221
1222int igmp6_event_report(struct sk_buff *skb)
1223{
1224 struct ifmcaddr6 *ma;
1225 struct in6_addr *addrp;
1226 struct inet6_dev *idev;
1227 struct icmp6hdr *hdr;
1228 int addr_type;
1229
1230 /* Our own report looped back. Ignore it. */
1231 if (skb->pkt_type == PACKET_LOOPBACK)
1232 return 0;
1233
1234 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1235 return -EINVAL;
1236
1237 hdr = (struct icmp6hdr*) skb->h.raw;
1238
1239 /* Drop reports with not link local source */
1240 addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
1241 if (addr_type != IPV6_ADDR_ANY &&
1242 !(addr_type&IPV6_ADDR_LINKLOCAL))
1243 return -EINVAL;
1244
1245 addrp = (struct in6_addr *) (hdr + 1);
1246
1247 idev = in6_dev_get(skb->dev);
1248 if (idev == NULL)
1249 return -ENODEV;
1250
1251 /*
1252 * Cancel the timer for this group
1253 */
1254
1255 read_lock_bh(&idev->lock);
1256 for (ma = idev->mc_list; ma; ma=ma->next) {
1257 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1258 spin_lock(&ma->mca_lock);
1259 if (del_timer(&ma->mca_timer))
1260 atomic_dec(&ma->mca_refcnt);
1261 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1262 spin_unlock(&ma->mca_lock);
1263 break;
1264 }
1265 }
1266 read_unlock_bh(&idev->lock);
1267 in6_dev_put(idev);
1268 return 0;
1269}
1270
1271static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1272 int gdeleted, int sdeleted)
1273{
1274 switch (type) {
1275 case MLD2_MODE_IS_INCLUDE:
1276 case MLD2_MODE_IS_EXCLUDE:
1277 if (gdeleted || sdeleted)
1278 return 0;
1279 return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
1280 case MLD2_CHANGE_TO_INCLUDE:
1281 if (gdeleted || sdeleted)
1282 return 0;
1283 return psf->sf_count[MCAST_INCLUDE] != 0;
1284 case MLD2_CHANGE_TO_EXCLUDE:
1285 if (gdeleted || sdeleted)
1286 return 0;
1287 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1288 psf->sf_count[MCAST_INCLUDE])
1289 return 0;
1290 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1291 psf->sf_count[MCAST_EXCLUDE];
1292 case MLD2_ALLOW_NEW_SOURCES:
1293 if (gdeleted || !psf->sf_crcount)
1294 return 0;
1295 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1296 case MLD2_BLOCK_OLD_SOURCES:
1297 if (pmc->mca_sfmode == MCAST_INCLUDE)
1298 return gdeleted || (psf->sf_crcount && sdeleted);
1299 return psf->sf_crcount && !gdeleted && !sdeleted;
1300 }
1301 return 0;
1302}
1303
1304static int
1305mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1306{
1307 struct ip6_sf_list *psf;
1308 int scount = 0;
1309
1310 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1311 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1312 continue;
1313 scount++;
1314 }
1315 return scount;
1316}
1317
1318static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1319{
1320 struct sock *sk = igmp6_socket->sk;
1321 struct sk_buff *skb;
1322 struct mld2_report *pmr;
1323 struct in6_addr addr_buf;
1324 int err;
1325 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1326 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1327 IPV6_TLV_PADN, 0 };
1328
1329 /* we assume size > sizeof(ra) here */
1330 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1331
1332 if (skb == 0)
1333 return NULL;
1334
1335 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1336
1337 if (ipv6_get_lladdr(dev, &addr_buf)) {
1338 /* <draft-ietf-magma-mld-source-05.txt>:
1339 * use unspecified address as the source address
1340 * when a valid link-local address is not available.
1341 */
1342 memset(&addr_buf, 0, sizeof(addr_buf));
1343 }
1344
1345 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1346
1347 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1348
1349 pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
1350 skb->h.raw = (unsigned char *)pmr;
1351 pmr->type = ICMPV6_MLD2_REPORT;
1352 pmr->resv1 = 0;
1353 pmr->csum = 0;
1354 pmr->resv2 = 0;
1355 pmr->ngrec = 0;
1356 return skb;
1357}
1358
e9823185
PM		 1359static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1360{
1361 struct net_device *dev = skb->dev;
1362
1363 if (dev->hard_header) {
1364 unsigned char ha[MAX_ADDR_LEN];
1365 int err;
1366
1367 ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
1368 err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
1369 if (err < 0) {
1370 kfree_skb(skb);
1371 return err;
1372 }
1373 }
1374 return dev_queue_xmit(skb);
1375}
1376
1377static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1378{
1379 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
1380 mld_dev_queue_xmit2);
1381}
1382
1da177e4
LT		 1383static void mld_sendpack(struct sk_buff *skb)
1384{
1385 struct ipv6hdr *pip6 = skb->nh.ipv6h;
1386 struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
1387 int payload_len, mldlen;
1388 struct inet6_dev *idev = in6_dev_get(skb->dev);
1389 int err;
1390
1391 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1392 payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
1393 sizeof(struct ipv6hdr);
1394 mldlen = skb->tail - skb->h.raw;
1395 pip6->payload_len = htons(payload_len);
1396
1397 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1398 IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
1399 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1400 mld_dev_queue_xmit);
1da177e4
LT		 1401 if (!err) {
1402 ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
1403 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1404 } else
1405 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1406
1407 if (likely(idev != NULL))
1408 in6_dev_put(idev);
1409}
1410
1411static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1412{
fab10fe3 1413 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1da177e4
LT		 1414}
1415
1416static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1417 int type, struct mld2_grec **ppgr)
1418{
1419 struct net_device *dev = pmc->idev->dev;
1420 struct mld2_report *pmr;
1421 struct mld2_grec *pgr;
1422
1423 if (!skb)
1424 skb = mld_newpack(dev, dev->mtu);
1425 if (!skb)
1426 return NULL;
1427 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1428 pgr->grec_type = type;
1429 pgr->grec_auxwords = 0;
1430 pgr->grec_nsrcs = 0;
1431 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1432 pmr = (struct mld2_report *)skb->h.raw;
1433 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1434 *ppgr = pgr;
1435 return skb;
1436}
1437
1438#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1439 skb_tailroom(skb)) : 0)
1440
1441static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1442 int type, int gdeleted, int sdeleted)
1443{
1444 struct net_device *dev = pmc->idev->dev;
1445 struct mld2_report *pmr;
1446 struct mld2_grec *pgr = NULL;
1447 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1448 int scount, first, isquery, truncate;
1449
1450 if (pmc->mca_flags & MAF_NOREPORT)
1451 return skb;
1452
1453 isquery = type == MLD2_MODE_IS_INCLUDE ||
1454 type == MLD2_MODE_IS_EXCLUDE;
1455 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1456 type == MLD2_CHANGE_TO_EXCLUDE;
1457
1458 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1459
1460 if (!*psf_list) {
1461 if (type == MLD2_ALLOW_NEW_SOURCES ||
1462 type == MLD2_BLOCK_OLD_SOURCES)
1463 return skb;
1464 if (pmc->mca_crcount || isquery) {
1465 /* make sure we have room for group header and at
1466 * least one source.
1467 */
1468 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
1469 sizeof(struct in6_addr)) {
1470 mld_sendpack(skb);
1471 skb = NULL; /* add_grhead will get a new one */
1472 }
1473 skb = add_grhead(skb, pmc, type, &pgr);
1474 }
1475 return skb;
1476 }
1477 pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
1478
1479 /* EX and TO_EX get a fresh packet, if needed */
1480 if (truncate) {
1481 if (pmr && pmr->ngrec &&
1482 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1483 if (skb)
1484 mld_sendpack(skb);
1485 skb = mld_newpack(dev, dev->mtu);
1486 }
1487 }
1488 first = 1;
1489 scount = 0;
1490 psf_prev = NULL;
1491 for (psf=*psf_list; psf; psf=psf_next) {
1492 struct in6_addr *psrc;
1493
1494 psf_next = psf->sf_next;
1495
1496 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1497 psf_prev = psf;
1498 continue;
1499 }
1500
1501 /* clear marks on query responses */
1502 if (isquery)
1503 psf->sf_gsresp = 0;
1504
1505 if (AVAILABLE(skb) < sizeof(*psrc) +
1506 first*sizeof(struct mld2_grec)) {
1507 if (truncate && !first)
1508 break; /* truncate these */
1509 if (pgr)
1510 pgr->grec_nsrcs = htons(scount);
1511 if (skb)
1512 mld_sendpack(skb);
1513 skb = mld_newpack(dev, dev->mtu);
1514 first = 1;
1515 scount = 0;
1516 }
1517 if (first) {
1518 skb = add_grhead(skb, pmc, type, &pgr);
1519 first = 0;
1520 }
1521 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1522 *psrc = psf->sf_addr;
1523 scount++;
1524 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1525 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1526 psf->sf_crcount--;
1527 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1528 if (psf_prev)
1529 psf_prev->sf_next = psf->sf_next;
1530 else
1531 *psf_list = psf->sf_next;
1532 kfree(psf);
1533 continue;
1534 }
1535 }
1536 psf_prev = psf;
1537 }
1538 if (pgr)
1539 pgr->grec_nsrcs = htons(scount);
1540
1541 if (isquery)
1542 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1543 return skb;
1544}
1545
1546static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1547{
1548 struct sk_buff *skb = NULL;
1549 int type;
1550
1551 if (!pmc) {
1552 read_lock_bh(&idev->lock);
1553 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1554 if (pmc->mca_flags & MAF_NOREPORT)
1555 continue;
1556 spin_lock_bh(&pmc->mca_lock);
1557 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1558 type = MLD2_MODE_IS_EXCLUDE;
1559 else
1560 type = MLD2_MODE_IS_INCLUDE;
1561 skb = add_grec(skb, pmc, type, 0, 0);
1562 spin_unlock_bh(&pmc->mca_lock);
1563 }
1564 read_unlock_bh(&idev->lock);
1565 } else {
1566 spin_lock_bh(&pmc->mca_lock);
1567 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1568 type = MLD2_MODE_IS_EXCLUDE;
1569 else
1570 type = MLD2_MODE_IS_INCLUDE;
1571 skb = add_grec(skb, pmc, type, 0, 0);
1572 spin_unlock_bh(&pmc->mca_lock);
1573 }
1574 if (skb)
1575 mld_sendpack(skb);
1576}
1577
1578/*
1579 * remove zero-count source records from a source filter list
1580 */
1581static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1582{
1583 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1584
1585 psf_prev = NULL;
1586 for (psf=*ppsf; psf; psf = psf_next) {
1587 psf_next = psf->sf_next;
1588 if (psf->sf_crcount == 0) {
1589 if (psf_prev)
1590 psf_prev->sf_next = psf->sf_next;
1591 else
1592 *ppsf = psf->sf_next;
1593 kfree(psf);
1594 } else
1595 psf_prev = psf;
1596 }
1597}
1598
1599static void mld_send_cr(struct inet6_dev *idev)
1600{
1601 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1602 struct sk_buff *skb = NULL;
1603 int type, dtype;
1604
1605 read_lock_bh(&idev->lock);
1606 write_lock_bh(&idev->mc_lock);
1607
1608 /* deleted MCA's */
1609 pmc_prev = NULL;
1610 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1611 pmc_next = pmc->next;
1612 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1613 type = MLD2_BLOCK_OLD_SOURCES;
1614 dtype = MLD2_BLOCK_OLD_SOURCES;
1615 skb = add_grec(skb, pmc, type, 1, 0);
1616 skb = add_grec(skb, pmc, dtype, 1, 1);
1617 }
1618 if (pmc->mca_crcount) {
1619 pmc->mca_crcount--;
1620 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1621 type = MLD2_CHANGE_TO_INCLUDE;
1622 skb = add_grec(skb, pmc, type, 1, 0);
1623 }
1624 if (pmc->mca_crcount == 0) {
1625 mld_clear_zeros(&pmc->mca_tomb);
1626 mld_clear_zeros(&pmc->mca_sources);
1627 }
1628 }
1629 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1630 !pmc->mca_sources) {
1631 if (pmc_prev)
1632 pmc_prev->next = pmc_next;
1633 else
1634 idev->mc_tomb = pmc_next;
1635 in6_dev_put(pmc->idev);
1636 kfree(pmc);
1637 } else
1638 pmc_prev = pmc;
1639 }
1640 write_unlock_bh(&idev->mc_lock);
1641
1642 /* change recs */
1643 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1644 spin_lock_bh(&pmc->mca_lock);
1645 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1646 type = MLD2_BLOCK_OLD_SOURCES;
1647 dtype = MLD2_ALLOW_NEW_SOURCES;
1648 } else {
1649 type = MLD2_ALLOW_NEW_SOURCES;
1650 dtype = MLD2_BLOCK_OLD_SOURCES;
1651 }
1652 skb = add_grec(skb, pmc, type, 0, 0);
1653 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1654
1655 /* filter mode changes */
1656 if (pmc->mca_crcount) {
1657 pmc->mca_crcount--;
1658 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1659 type = MLD2_CHANGE_TO_EXCLUDE;
1660 else
1661 type = MLD2_CHANGE_TO_INCLUDE;
1662 skb = add_grec(skb, pmc, type, 0, 0);
1663 }
1664 spin_unlock_bh(&pmc->mca_lock);
1665 }
1666 read_unlock_bh(&idev->lock);
1667 if (!skb)
1668 return;
1669 (void) mld_sendpack(skb);
1670}
1671
1672static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1673{
1674 struct sock *sk = igmp6_socket->sk;
1675 struct inet6_dev *idev;
1676 struct sk_buff *skb;
1677 struct icmp6hdr *hdr;
1678 struct in6_addr *snd_addr;
1679 struct in6_addr *addrp;
1680 struct in6_addr addr_buf;
1681 struct in6_addr all_routers;
1682 int err, len, payload_len, full_len;
1683 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1684 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1685 IPV6_TLV_PADN, 0 };
1686
1687 IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
1688 snd_addr = addr;
1689 if (type == ICMPV6_MGM_REDUCTION) {
1690 snd_addr = &all_routers;
1691 ipv6_addr_all_routers(&all_routers);
1692 }
1693
1694 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1695 payload_len = len + sizeof(ra);
1696 full_len = sizeof(struct ipv6hdr) + payload_len;
1697
1698 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1699
1700 if (skb == NULL) {
1701 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1702 return;
1703 }
1704
1705 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1da177e4
LT		 1706
1707 if (ipv6_get_lladdr(dev, &addr_buf)) {
1708 /* <draft-ietf-magma-mld-source-05.txt>:
1709 * use unspecified address as the source address
1710 * when a valid link-local address is not available.
1711 */
1712 memset(&addr_buf, 0, sizeof(addr_buf));
1713 }
1714
1715 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1716
1717 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1718
1719 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1720 memset(hdr, 0, sizeof(struct icmp6hdr));
1721 hdr->icmp6_type = type;
1722
1723 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1724 ipv6_addr_copy(addrp, addr);
1725
1726 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1727 IPPROTO_ICMPV6,
1728 csum_partial((__u8 *) hdr, len, 0));
1729
1730 idev = in6_dev_get(skb->dev);
1731
1732 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
e9823185 1733 mld_dev_queue_xmit);
1da177e4
LT		 1734 if (!err) {
1735 if (type == ICMPV6_MGM_REDUCTION)
1736 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
1737 else
1738 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
1739 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1740 IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
1741 } else
1742 IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
1743
1744 if (likely(idev != NULL))
1745 in6_dev_put(idev);
1746 return;
1da177e4
LT		 1747}
1748
1749static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1750 struct in6_addr *psfsrc)
1751{
1752 struct ip6_sf_list *psf, *psf_prev;
1753 int rv = 0;
1754
1755 psf_prev = NULL;
1756 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1757 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1758 break;
1759 psf_prev = psf;
1760 }
1761 if (!psf || psf->sf_count[sfmode] == 0) {
1762 /* source filter not found, or count wrong => bug */
1763 return -ESRCH;
1764 }
1765 psf->sf_count[sfmode]--;
1766 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1767 struct inet6_dev *idev = pmc->idev;
1768
1769 /* no more filters for this source */
1770 if (psf_prev)
1771 psf_prev->sf_next = psf->sf_next;
1772 else
1773 pmc->mca_sources = psf->sf_next;
1774 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1775 !MLD_V1_SEEN(idev)) {
1776 psf->sf_crcount = idev->mc_qrv;
1777 psf->sf_next = pmc->mca_tomb;
1778 pmc->mca_tomb = psf;
1779 rv = 1;
1780 } else
1781 kfree(psf);
1782 }
1783 return rv;
1784}
1785
1786static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1787 int sfmode, int sfcount, struct in6_addr *psfsrc,
1788 int delta)
1789{
1790 struct ifmcaddr6 *pmc;
1791 int changerec = 0;
1792 int i, err;
1793
1794 if (!idev)
1795 return -ENODEV;
1796 read_lock_bh(&idev->lock);
1797 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1798 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1799 break;
1800 }
1801 if (!pmc) {
1802 /* MCA not found?? bug */
1803 read_unlock_bh(&idev->lock);
1804 return -ESRCH;
1805 }
1806 spin_lock_bh(&pmc->mca_lock);
1807 sf_markstate(pmc);
1808 if (!delta) {
1809 if (!pmc->mca_sfcount[sfmode]) {
1810 spin_unlock_bh(&pmc->mca_lock);
1811 read_unlock_bh(&idev->lock);
1812 return -EINVAL;
1813 }
1814 pmc->mca_sfcount[sfmode]--;
1815 }
1816 err = 0;
1817 for (i=0; i<sfcount; i++) {
1818 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1819
1820 changerec |= rv > 0;
1821 if (!err && rv < 0)
1822 err = rv;
1823 }
1824 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1825 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1826 pmc->mca_sfcount[MCAST_INCLUDE]) {
1827 struct ip6_sf_list *psf;
1828
1829 /* filter mode change */
1830 pmc->mca_sfmode = MCAST_INCLUDE;
1831 pmc->mca_crcount = idev->mc_qrv;
1832 idev->mc_ifc_count = pmc->mca_crcount;
1833 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1834 psf->sf_crcount = 0;
1835 mld_ifc_event(pmc->idev);
1836 } else if (sf_setstate(pmc) || changerec)
1837 mld_ifc_event(pmc->idev);
1838 spin_unlock_bh(&pmc->mca_lock);
1839 read_unlock_bh(&idev->lock);
1840 return err;
1841}
1842
1843/*
1844 * Add multicast single-source filter to the interface list
1845 */
1846static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1847 struct in6_addr *psfsrc, int delta)
1848{
1849 struct ip6_sf_list *psf, *psf_prev;
1850
1851 psf_prev = NULL;
1852 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1853 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1854 break;
1855 psf_prev = psf;
1856 }
1857 if (!psf) {
1858 psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
1859 if (!psf)
1860 return -ENOBUFS;
1861 memset(psf, 0, sizeof(*psf));
1862 psf->sf_addr = *psfsrc;
1863 if (psf_prev) {
1864 psf_prev->sf_next = psf;
1865 } else
1866 pmc->mca_sources = psf;
1867 }
1868 psf->sf_count[sfmode]++;
1869 return 0;
1870}
1871
1872static void sf_markstate(struct ifmcaddr6 *pmc)
1873{
1874 struct ip6_sf_list *psf;
1875 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1876
1877 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1878 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1879 psf->sf_oldin = mca_xcount ==
1880 psf->sf_count[MCAST_EXCLUDE] &&
1881 !psf->sf_count[MCAST_INCLUDE];
1882 } else
1883 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1884}
1885
1886static int sf_setstate(struct ifmcaddr6 *pmc)
1887{
1888 struct ip6_sf_list *psf;
1889 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1890 int qrv = pmc->idev->mc_qrv;
1891 int new_in, rv;
1892
1893 rv = 0;
1894 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1895 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1896 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1897 !psf->sf_count[MCAST_INCLUDE];
1898 } else
1899 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1900 if (new_in != psf->sf_oldin) {
1901 psf->sf_crcount = qrv;
1902 rv++;
1903 }
1904 }
1905 return rv;
1906}
1907
1908/*
1909 * Add multicast source filter list to the interface list
1910 */
1911static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
1912 int sfmode, int sfcount, struct in6_addr *psfsrc,
1913 int delta)
1914{
1915 struct ifmcaddr6 *pmc;
1916 int isexclude;
1917 int i, err;
1918
1919 if (!idev)
1920 return -ENODEV;
1921 read_lock_bh(&idev->lock);
1922 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1923 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1924 break;
1925 }
1926 if (!pmc) {
1927 /* MCA not found?? bug */
1928 read_unlock_bh(&idev->lock);
1929 return -ESRCH;
1930 }
1931 spin_lock_bh(&pmc->mca_lock);
1932
1933 sf_markstate(pmc);
1934 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
1935 if (!delta)
1936 pmc->mca_sfcount[sfmode]++;
1937 err = 0;
1938 for (i=0; i<sfcount; i++) {
1939 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1940 if (err)
1941 break;
1942 }
1943 if (err) {
1944 int j;
1945
1946 if (!delta)
1947 pmc->mca_sfcount[sfmode]--;
1948 for (j=0; j<i; j++)
1949 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1950 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
1951 struct inet6_dev *idev = pmc->idev;
1952 struct ip6_sf_list *psf;
1953
1954 /* filter mode change */
1955 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1956 pmc->mca_sfmode = MCAST_EXCLUDE;
1957 else if (pmc->mca_sfcount[MCAST_INCLUDE])
1958 pmc->mca_sfmode = MCAST_INCLUDE;
1959 /* else no filters; keep old mode for reports */
1960
1961 pmc->mca_crcount = idev->mc_qrv;
1962 idev->mc_ifc_count = pmc->mca_crcount;
1963 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1964 psf->sf_crcount = 0;
1965 mld_ifc_event(idev);
1966 } else if (sf_setstate(pmc))
1967 mld_ifc_event(idev);
1968 spin_unlock_bh(&pmc->mca_lock);
1969 read_unlock_bh(&idev->lock);
1970 return err;
1971}
1972
1973static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
1974{
1975 struct ip6_sf_list *psf, *nextpsf;
1976
1977 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
1978 nextpsf = psf->sf_next;
1979 kfree(psf);
1980 }
1981 pmc->mca_tomb = NULL;
1982 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
1983 nextpsf = psf->sf_next;
1984 kfree(psf);
1985 }
1986 pmc->mca_sources = NULL;
1987 pmc->mca_sfmode = MCAST_EXCLUDE;
de9daad9 1988 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
1da177e4
LT		 1989 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
1990}
1991
1992
1993static void igmp6_join_group(struct ifmcaddr6 *ma)
1994{
1995 unsigned long delay;
1996
1997 if (ma->mca_flags & MAF_NOREPORT)
1998 return;
1999
2000 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2001
2002 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2003
2004 spin_lock_bh(&ma->mca_lock);
2005 if (del_timer(&ma->mca_timer)) {
2006 atomic_dec(&ma->mca_refcnt);
2007 delay = ma->mca_timer.expires - jiffies;
2008 }
2009
2010 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2011 atomic_inc(&ma->mca_refcnt);
2012 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2013 spin_unlock_bh(&ma->mca_lock);
2014}
2015
2016static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2017 struct inet6_dev *idev)
2018{
2019 int err;
2020
2021 if (iml->sflist == 0) {
2022 /* any-source empty exclude case */
2023 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2024 }
2025 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2026 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2027 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2028 iml->sflist = NULL;
2029 return err;
2030}
2031
2032static void igmp6_leave_group(struct ifmcaddr6 *ma)
2033{
2034 if (MLD_V1_SEEN(ma->idev)) {
2035 if (ma->mca_flags & MAF_LAST_REPORTER)
2036 igmp6_send(&ma->mca_addr, ma->idev->dev,
2037 ICMPV6_MGM_REDUCTION);
2038 } else {
2039 mld_add_delrec(ma->idev, ma);
2040 mld_ifc_event(ma->idev);
2041 }
2042}
2043
2044static void mld_gq_timer_expire(unsigned long data)
2045{
2046 struct inet6_dev *idev = (struct inet6_dev *)data;
2047
2048 idev->mc_gq_running = 0;
2049 mld_send_report(idev, NULL);
2050 __in6_dev_put(idev);
2051}
2052
2053static void mld_ifc_timer_expire(unsigned long data)
2054{
2055 struct inet6_dev *idev = (struct inet6_dev *)data;
2056
2057 mld_send_cr(idev);
2058 if (idev->mc_ifc_count) {
2059 idev->mc_ifc_count--;
2060 if (idev->mc_ifc_count)
2061 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2062 }
2063 __in6_dev_put(idev);
2064}
2065
2066static void mld_ifc_event(struct inet6_dev *idev)
2067{
2068 if (MLD_V1_SEEN(idev))
2069 return;
2070 idev->mc_ifc_count = idev->mc_qrv;
2071 mld_ifc_start_timer(idev, 1);
2072}
2073
2074
2075static void igmp6_timer_handler(unsigned long data)
2076{
2077 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2078
2079 if (MLD_V1_SEEN(ma->idev))
2080 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2081 else
2082 mld_send_report(ma->idev, ma);
2083
2084 spin_lock(&ma->mca_lock);
2085 ma->mca_flags |= MAF_LAST_REPORTER;
2086 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2087 spin_unlock(&ma->mca_lock);
2088 ma_put(ma);
2089}
2090
2091/* Device going down */
2092
2093void ipv6_mc_down(struct inet6_dev *idev)
2094{
2095 struct ifmcaddr6 *i;
2096
2097 /* Withdraw multicast list */
2098
2099 read_lock_bh(&idev->lock);
2100 idev->mc_ifc_count = 0;
2101 if (del_timer(&idev->mc_ifc_timer))
2102 __in6_dev_put(idev);
2103 idev->mc_gq_running = 0;
2104 if (del_timer(&idev->mc_gq_timer))
2105 __in6_dev_put(idev);
2106
2107 for (i = idev->mc_list; i; i=i->next)
2108 igmp6_group_dropped(i);
2109 read_unlock_bh(&idev->lock);
2110
2111 mld_clear_delrec(idev);
2112}
2113
2114
2115/* Device going up */
2116
2117void ipv6_mc_up(struct inet6_dev *idev)
2118{
2119 struct ifmcaddr6 *i;
2120
2121 /* Install multicast list, except for all-nodes (already installed) */
2122
2123 read_lock_bh(&idev->lock);
2124 for (i = idev->mc_list; i; i=i->next)
2125 igmp6_group_added(i);
2126 read_unlock_bh(&idev->lock);
2127}
2128
2129/* IPv6 device initialization. */
2130
2131void ipv6_mc_init_dev(struct inet6_dev *idev)
2132{
2133 struct in6_addr maddr;
2134
2135 write_lock_bh(&idev->lock);
2136 rwlock_init(&idev->mc_lock);
2137 idev->mc_gq_running = 0;
2138 init_timer(&idev->mc_gq_timer);
2139 idev->mc_gq_timer.data = (unsigned long) idev;
2140 idev->mc_gq_timer.function = &mld_gq_timer_expire;
2141 idev->mc_tomb = NULL;
2142 idev->mc_ifc_count = 0;
2143 init_timer(&idev->mc_ifc_timer);
2144 idev->mc_ifc_timer.data = (unsigned long) idev;
2145 idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
2146 idev->mc_qrv = MLD_QRV_DEFAULT;
2147 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2148 idev->mc_v1_seen = 0;
2149 write_unlock_bh(&idev->lock);
2150
2151 /* Add all-nodes address. */
2152 ipv6_addr_all_nodes(&maddr);
2153 ipv6_dev_mc_inc(idev->dev, &maddr);
2154}
2155
2156/*
2157 * Device is about to be destroyed: clean up.
2158 */
2159
2160void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2161{
2162 struct ifmcaddr6 *i;
2163 struct in6_addr maddr;
2164
2165 /* Deactivate timers */
2166 ipv6_mc_down(idev);
2167
2168 /* Delete all-nodes address. */
2169 ipv6_addr_all_nodes(&maddr);
2170
2171 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2172 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2173 * fail.
2174 */
2175 __ipv6_dev_mc_dec(idev, &maddr);
2176
2177 if (idev->cnf.forwarding) {
2178 ipv6_addr_all_routers(&maddr);
2179 __ipv6_dev_mc_dec(idev, &maddr);
2180 }
2181
2182 write_lock_bh(&idev->lock);
2183 while ((i = idev->mc_list) != NULL) {
2184 idev->mc_list = i->next;
2185 write_unlock_bh(&idev->lock);
2186
2187 igmp6_group_dropped(i);
2188 ma_put(i);
2189
2190 write_lock_bh(&idev->lock);
2191 }
2192 write_unlock_bh(&idev->lock);
2193}
2194
2195#ifdef CONFIG_PROC_FS
2196struct igmp6_mc_iter_state {
2197 struct net_device *dev;
2198 struct inet6_dev *idev;
2199};
2200
2201#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2202
2203static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2204{
2205 struct ifmcaddr6 *im = NULL;
2206 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2207
2208 for (state->dev = dev_base, state->idev = NULL;
2209 state->dev;
2210 state->dev = state->dev->next) {
2211 struct inet6_dev *idev;
2212 idev = in6_dev_get(state->dev);
2213 if (!idev)
2214 continue;
2215 read_lock_bh(&idev->lock);
2216 im = idev->mc_list;
2217 if (im) {
2218 state->idev = idev;
2219 break;
2220 }
2221 read_unlock_bh(&idev->lock);
2222 in6_dev_put(idev);
2223 }
2224 return im;
2225}
2226
2227static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2228{
2229 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2230
2231 im = im->next;
2232 while (!im) {
2233 if (likely(state->idev != NULL)) {
2234 read_unlock_bh(&state->idev->lock);
2235 in6_dev_put(state->idev);
2236 }
2237 state->dev = state->dev->next;
2238 if (!state->dev) {
2239 state->idev = NULL;
2240 break;
2241 }
2242 state->idev = in6_dev_get(state->dev);
2243 if (!state->idev)
2244 continue;
2245 read_lock_bh(&state->idev->lock);
2246 im = state->idev->mc_list;
2247 }
2248 return im;
2249}
2250
2251static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2252{
2253 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2254 if (im)
2255 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2256 --pos;
2257 return pos ? NULL : im;
2258}
2259
2260static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2261{
2262 read_lock(&dev_base_lock);
2263 return igmp6_mc_get_idx(seq, *pos);
2264}
2265
2266static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2267{
2268 struct ifmcaddr6 *im;
2269 im = igmp6_mc_get_next(seq, v);
2270 ++*pos;
2271 return im;
2272}
2273
2274static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2275{
2276 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2277 if (likely(state->idev != NULL)) {
2278 read_unlock_bh(&state->idev->lock);
2279 in6_dev_put(state->idev);
2280 state->idev = NULL;
2281 }
2282 state->dev = NULL;
2283 read_unlock(&dev_base_lock);
2284}
2285
2286static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2287{
2288 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2289 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2290
2291 seq_printf(seq,
2292 "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n",
2293 state->dev->ifindex, state->dev->name,
2294 NIP6(im->mca_addr),
2295 im->mca_users, im->mca_flags,
2296 (im->mca_flags&MAF_TIMER_RUNNING) ?
2297 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2298 return 0;
2299}
2300
2301static struct seq_operations igmp6_mc_seq_ops = {
2302 .start = igmp6_mc_seq_start,
2303 .next = igmp6_mc_seq_next,
2304 .stop = igmp6_mc_seq_stop,
2305 .show = igmp6_mc_seq_show,
2306};
2307
2308static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2309{
2310 struct seq_file *seq;
2311 int rc = -ENOMEM;
2312 struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2313
2314 if (!s)
2315 goto out;
2316
2317 rc = seq_open(file, &igmp6_mc_seq_ops);
2318 if (rc)
2319 goto out_kfree;
2320
2321 seq = file->private_data;
2322 seq->private = s;
2323 memset(s, 0, sizeof(*s));
2324out:
2325 return rc;
2326out_kfree:
2327 kfree(s);
2328 goto out;
2329}
2330
2331static struct file_operations igmp6_mc_seq_fops = {
2332 .owner = THIS_MODULE,
2333 .open = igmp6_mc_seq_open,
2334 .read = seq_read,
2335 .llseek = seq_lseek,
2336 .release = seq_release_private,
2337};
2338
2339struct igmp6_mcf_iter_state {
2340 struct net_device *dev;
2341 struct inet6_dev *idev;
2342 struct ifmcaddr6 *im;
2343};
2344
2345#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2346
2347static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2348{
2349 struct ip6_sf_list *psf = NULL;
2350 struct ifmcaddr6 *im = NULL;
2351 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2352
2353 for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
2354 state->dev;
2355 state->dev = state->dev->next) {
2356 struct inet6_dev *idev;
2357 idev = in6_dev_get(state->dev);
2358 if (unlikely(idev == NULL))
2359 continue;
2360 read_lock_bh(&idev->lock);
2361 im = idev->mc_list;
2362 if (likely(im != NULL)) {
2363 spin_lock_bh(&im->mca_lock);
2364 psf = im->mca_sources;
2365 if (likely(psf != NULL)) {
2366 state->im = im;
2367 state->idev = idev;
2368 break;
2369 }
2370 spin_unlock_bh(&im->mca_lock);
2371 }
2372 read_unlock_bh(&idev->lock);
2373 in6_dev_put(idev);
2374 }
2375 return psf;
2376}
2377
2378static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2379{
2380 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2381
2382 psf = psf->sf_next;
2383 while (!psf) {
2384 spin_unlock_bh(&state->im->mca_lock);
2385 state->im = state->im->next;
2386 while (!state->im) {
2387 if (likely(state->idev != NULL)) {
2388 read_unlock_bh(&state->idev->lock);
2389 in6_dev_put(state->idev);
2390 }
2391 state->dev = state->dev->next;
2392 if (!state->dev) {
2393 state->idev = NULL;
2394 goto out;
2395 }
2396 state->idev = in6_dev_get(state->dev);
2397 if (!state->idev)
2398 continue;
2399 read_lock_bh(&state->idev->lock);
2400 state->im = state->idev->mc_list;
2401 }
2402 if (!state->im)
2403 break;
2404 spin_lock_bh(&state->im->mca_lock);
2405 psf = state->im->mca_sources;
2406 }
2407out:
2408 return psf;
2409}
2410
2411static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2412{
2413 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2414 if (psf)
2415 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2416 --pos;
2417 return pos ? NULL : psf;
2418}
2419
2420static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2421{
2422 read_lock(&dev_base_lock);
2423 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2424}
2425
2426static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2427{
2428 struct ip6_sf_list *psf;
2429 if (v == SEQ_START_TOKEN)
2430 psf = igmp6_mcf_get_first(seq);
2431 else
2432 psf = igmp6_mcf_get_next(seq, v);
2433 ++*pos;
2434 return psf;
2435}
2436
2437static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2438{
2439 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2440 if (likely(state->im != NULL)) {
2441 spin_unlock_bh(&state->im->mca_lock);
2442 state->im = NULL;
2443 }
2444 if (likely(state->idev != NULL)) {
2445 read_unlock_bh(&state->idev->lock);
2446 in6_dev_put(state->idev);
2447 state->idev = NULL;
2448 }
2449 state->dev = NULL;
2450 read_unlock(&dev_base_lock);
2451}
2452
2453static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2454{
2455 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2456 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2457
2458 if (v == SEQ_START_TOKEN) {
2459 seq_printf(seq,
2460 "%3s %6s "
2461 "%32s %32s %6s %6s\n", "Idx",
2462 "Device", "Multicast Address",
2463 "Source Address", "INC", "EXC");
2464 } else {
2465 seq_printf(seq,
2466 "%3d %6.6s "
2467 "%04x%04x%04x%04x%04x%04x%04x%04x "
2468 "%04x%04x%04x%04x%04x%04x%04x%04x "
2469 "%6lu %6lu\n",
2470 state->dev->ifindex, state->dev->name,
2471 NIP6(state->im->mca_addr),
2472 NIP6(psf->sf_addr),
2473 psf->sf_count[MCAST_INCLUDE],
2474 psf->sf_count[MCAST_EXCLUDE]);
2475 }
2476 return 0;
2477}
2478
2479static struct seq_operations igmp6_mcf_seq_ops = {
2480 .start = igmp6_mcf_seq_start,
2481 .next = igmp6_mcf_seq_next,
2482 .stop = igmp6_mcf_seq_stop,
2483 .show = igmp6_mcf_seq_show,
2484};
2485
2486static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2487{
2488 struct seq_file *seq;
2489 int rc = -ENOMEM;
2490 struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
2491
2492 if (!s)
2493 goto out;
2494
2495 rc = seq_open(file, &igmp6_mcf_seq_ops);
2496 if (rc)
2497 goto out_kfree;
2498
2499 seq = file->private_data;
2500 seq->private = s;
2501 memset(s, 0, sizeof(*s));
2502out:
2503 return rc;
2504out_kfree:
2505 kfree(s);
2506 goto out;
2507}
2508
2509static struct file_operations igmp6_mcf_seq_fops = {
2510 .owner = THIS_MODULE,
2511 .open = igmp6_mcf_seq_open,
2512 .read = seq_read,
2513 .llseek = seq_lseek,
2514 .release = seq_release_private,
2515};
2516#endif
2517
2518int __init igmp6_init(struct net_proto_family *ops)
2519{
2520 struct ipv6_pinfo *np;
2521 struct sock *sk;
2522 int err;
2523
2524 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2525 if (err < 0) {
2526 printk(KERN_ERR
2527 "Failed to initialize the IGMP6 control socket (err %d).\n",
2528 err);
2529 igmp6_socket = NULL; /* For safety. */
2530 return err;
2531 }
2532
2533 sk = igmp6_socket->sk;
2534 sk->sk_allocation = GFP_ATOMIC;
2535 sk->sk_prot->unhash(sk);
2536
2537 np = inet6_sk(sk);
2538 np->hop_limit = 1;
2539
2540#ifdef CONFIG_PROC_FS
2541 proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2542 proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2543#endif
2544
2545 return 0;
2546}
2547
2548void igmp6_cleanup(void)
2549{
2550 sock_release(igmp6_socket);
2551 igmp6_socket = NULL; /* for safety */
2552
2553#ifdef CONFIG_PROC_FS
2554 proc_net_remove("mcfilter6");
2555 proc_net_remove("igmp6");
2556#endif
2557}
Clone of davem's net-next-2.6 tree