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