2 * Multicast support for IPv6
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
18 * yoshfuji : fix format of router-alert option
19 * YOSHIFUJI Hideaki @USAGI:
20 * Fixed source address for MLD message based on
21 * <draft-ietf-magma-mld-source-05.txt>.
22 * YOSHIFUJI Hideaki @USAGI:
23 * - Ignore Queries for invalid addresses.
24 * - MLD for link-local addresses.
25 * David L Stevens <dlstevens@us.ibm.com>:
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/string.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/jiffies.h>
36 #include <linux/times.h>
37 #include <linux/net.h>
39 #include <linux/in6.h>
40 #include <linux/netdevice.h>
41 #include <linux/if_arp.h>
42 #include <linux/route.h>
43 #include <linux/init.h>
44 #include <linux/proc_fs.h>
45 #include <linux/seq_file.h>
46 #include <linux/slab.h>
47 #include <linux/pkt_sched.h>
50 #include <linux/netfilter.h>
51 #include <linux/netfilter_ipv6.h>
53 #include <net/net_namespace.h>
58 #include <net/protocol.h>
59 #include <net/if_inet6.h>
60 #include <net/ndisc.h>
61 #include <net/addrconf.h>
62 #include <net/ip6_route.h>
63 #include <net/inet_common.h>
65 #include <net/ip6_checksum.h>
67 /* Ensure that we have struct in6_addr aligned on 32bit word. */
68 static void *__mld2_query_bugs
[] __attribute__((__unused__
)) = {
69 BUILD_BUG_ON_NULL(offsetof(struct mld2_query
, mld2q_srcs
) % 4),
70 BUILD_BUG_ON_NULL(offsetof(struct mld2_report
, mld2r_grec
) % 4),
71 BUILD_BUG_ON_NULL(offsetof(struct mld2_grec
, grec_mca
) % 4)
74 static struct in6_addr mld2_all_mcr
= MLD2_ALL_MCR_INIT
;
76 static void igmp6_join_group(struct ifmcaddr6
*ma
);
77 static void igmp6_leave_group(struct ifmcaddr6
*ma
);
78 static void igmp6_timer_handler(unsigned long data
);
80 static void mld_gq_timer_expire(unsigned long data
);
81 static void mld_ifc_timer_expire(unsigned long data
);
82 static void mld_ifc_event(struct inet6_dev
*idev
);
83 static void mld_add_delrec(struct inet6_dev
*idev
, struct ifmcaddr6
*pmc
);
84 static void mld_del_delrec(struct inet6_dev
*idev
, const struct in6_addr
*addr
);
85 static void mld_clear_delrec(struct inet6_dev
*idev
);
86 static bool mld_in_v1_mode(const struct inet6_dev
*idev
);
87 static int sf_setstate(struct ifmcaddr6
*pmc
);
88 static void sf_markstate(struct ifmcaddr6
*pmc
);
89 static void ip6_mc_clear_src(struct ifmcaddr6
*pmc
);
90 static int ip6_mc_del_src(struct inet6_dev
*idev
, const struct in6_addr
*pmca
,
91 int sfmode
, int sfcount
, const struct in6_addr
*psfsrc
,
93 static int ip6_mc_add_src(struct inet6_dev
*idev
, const struct in6_addr
*pmca
,
94 int sfmode
, int sfcount
, const struct in6_addr
*psfsrc
,
96 static int ip6_mc_leave_src(struct sock
*sk
, struct ipv6_mc_socklist
*iml
,
97 struct inet6_dev
*idev
);
99 #define MLD_QRV_DEFAULT 2
100 /* RFC3810, 9.2. Query Interval */
101 #define MLD_QI_DEFAULT (125 * HZ)
102 /* RFC3810, 9.3. Query Response Interval */
103 #define MLD_QRI_DEFAULT (10 * HZ)
105 /* RFC3810, 8.1 Query Version Distinctions */
106 #define MLD_V1_QUERY_LEN 24
107 #define MLD_V2_QUERY_LEN_MIN 28
109 #define IPV6_MLD_MAX_MSF 64
111 int sysctl_mld_max_msf __read_mostly
= IPV6_MLD_MAX_MSF
;
112 int sysctl_mld_qrv __read_mostly
= MLD_QRV_DEFAULT
;
115 * socket join on multicast group
118 #define for_each_pmc_rcu(np, pmc) \
119 for (pmc = rcu_dereference(np->ipv6_mc_list); \
121 pmc = rcu_dereference(pmc->next))
123 static int unsolicited_report_interval(struct inet6_dev
*idev
)
127 if (mld_in_v1_mode(idev
))
128 iv
= idev
->cnf
.mldv1_unsolicited_report_interval
;
130 iv
= idev
->cnf
.mldv2_unsolicited_report_interval
;
132 return iv
> 0 ? iv
: 1;
135 int ipv6_sock_mc_join(struct sock
*sk
, int ifindex
, const struct in6_addr
*addr
)
137 struct net_device
*dev
= NULL
;
138 struct ipv6_mc_socklist
*mc_lst
;
139 struct ipv6_pinfo
*np
= inet6_sk(sk
);
140 struct net
*net
= sock_net(sk
);
145 if (!ipv6_addr_is_multicast(addr
))
149 for_each_pmc_rcu(np
, mc_lst
) {
150 if ((ifindex
== 0 || mc_lst
->ifindex
== ifindex
) &&
151 ipv6_addr_equal(&mc_lst
->addr
, addr
)) {
158 mc_lst
= sock_kmalloc(sk
, sizeof(struct ipv6_mc_socklist
), GFP_KERNEL
);
164 mc_lst
->addr
= *addr
;
168 rt
= rt6_lookup(net
, addr
, NULL
, 0, 0);
174 dev
= __dev_get_by_index(net
, ifindex
);
177 sock_kfree_s(sk
, mc_lst
, sizeof(*mc_lst
));
181 mc_lst
->ifindex
= dev
->ifindex
;
182 mc_lst
->sfmode
= MCAST_EXCLUDE
;
183 rwlock_init(&mc_lst
->sflock
);
184 mc_lst
->sflist
= NULL
;
187 * now add/increase the group membership on the device
190 err
= ipv6_dev_mc_inc(dev
, addr
);
193 sock_kfree_s(sk
, mc_lst
, sizeof(*mc_lst
));
197 mc_lst
->next
= np
->ipv6_mc_list
;
198 rcu_assign_pointer(np
->ipv6_mc_list
, mc_lst
);
202 EXPORT_SYMBOL(ipv6_sock_mc_join
);
205 * socket leave on multicast group
207 int ipv6_sock_mc_drop(struct sock
*sk
, int ifindex
, const struct in6_addr
*addr
)
209 struct ipv6_pinfo
*np
= inet6_sk(sk
);
210 struct ipv6_mc_socklist
*mc_lst
;
211 struct ipv6_mc_socklist __rcu
**lnk
;
212 struct net
*net
= sock_net(sk
);
216 if (!ipv6_addr_is_multicast(addr
))
219 for (lnk
= &np
->ipv6_mc_list
;
220 (mc_lst
= rtnl_dereference(*lnk
)) != NULL
;
221 lnk
= &mc_lst
->next
) {
222 if ((ifindex
== 0 || mc_lst
->ifindex
== ifindex
) &&
223 ipv6_addr_equal(&mc_lst
->addr
, addr
)) {
224 struct net_device
*dev
;
228 dev
= __dev_get_by_index(net
, mc_lst
->ifindex
);
230 struct inet6_dev
*idev
= __in6_dev_get(dev
);
232 (void) ip6_mc_leave_src(sk
, mc_lst
, idev
);
234 __ipv6_dev_mc_dec(idev
, &mc_lst
->addr
);
236 (void) ip6_mc_leave_src(sk
, mc_lst
, NULL
);
238 atomic_sub(sizeof(*mc_lst
), &sk
->sk_omem_alloc
);
239 kfree_rcu(mc_lst
, rcu
);
244 return -EADDRNOTAVAIL
;
246 EXPORT_SYMBOL(ipv6_sock_mc_drop
);
248 /* called with rcu_read_lock() */
249 static struct inet6_dev
*ip6_mc_find_dev_rcu(struct net
*net
,
250 const struct in6_addr
*group
,
253 struct net_device
*dev
= NULL
;
254 struct inet6_dev
*idev
= NULL
;
257 struct rt6_info
*rt
= rt6_lookup(net
, group
, NULL
, 0, 0);
264 dev
= dev_get_by_index_rcu(net
, ifindex
);
268 idev
= __in6_dev_get(dev
);
271 read_lock_bh(&idev
->lock
);
273 read_unlock_bh(&idev
->lock
);
279 void ipv6_sock_mc_close(struct sock
*sk
)
281 struct ipv6_pinfo
*np
= inet6_sk(sk
);
282 struct ipv6_mc_socklist
*mc_lst
;
283 struct net
*net
= sock_net(sk
);
285 if (!rcu_access_pointer(np
->ipv6_mc_list
))
289 while ((mc_lst
= rtnl_dereference(np
->ipv6_mc_list
)) != NULL
) {
290 struct net_device
*dev
;
292 np
->ipv6_mc_list
= mc_lst
->next
;
294 dev
= __dev_get_by_index(net
, mc_lst
->ifindex
);
296 struct inet6_dev
*idev
= __in6_dev_get(dev
);
298 (void) ip6_mc_leave_src(sk
, mc_lst
, idev
);
300 __ipv6_dev_mc_dec(idev
, &mc_lst
->addr
);
302 (void) ip6_mc_leave_src(sk
, mc_lst
, NULL
);
304 atomic_sub(sizeof(*mc_lst
), &sk
->sk_omem_alloc
);
305 kfree_rcu(mc_lst
, rcu
);
311 int ip6_mc_source(int add
, int omode
, struct sock
*sk
,
312 struct group_source_req
*pgsr
)
314 struct in6_addr
*source
, *group
;
315 struct ipv6_mc_socklist
*pmc
;
316 struct inet6_dev
*idev
;
317 struct ipv6_pinfo
*inet6
= inet6_sk(sk
);
318 struct ip6_sf_socklist
*psl
;
319 struct net
*net
= sock_net(sk
);
325 source
= &((struct sockaddr_in6
*)&pgsr
->gsr_source
)->sin6_addr
;
326 group
= &((struct sockaddr_in6
*)&pgsr
->gsr_group
)->sin6_addr
;
328 if (!ipv6_addr_is_multicast(group
))
332 idev
= ip6_mc_find_dev_rcu(net
, group
, pgsr
->gsr_interface
);
338 err
= -EADDRNOTAVAIL
;
340 for_each_pmc_rcu(inet6
, pmc
) {
341 if (pgsr
->gsr_interface
&& pmc
->ifindex
!= pgsr
->gsr_interface
)
343 if (ipv6_addr_equal(&pmc
->addr
, group
))
346 if (!pmc
) { /* must have a prior join */
350 /* if a source filter was set, must be the same mode as before */
352 if (pmc
->sfmode
!= omode
) {
356 } else if (pmc
->sfmode
!= omode
) {
357 /* allow mode switches for empty-set filters */
358 ip6_mc_add_src(idev
, group
, omode
, 0, NULL
, 0);
359 ip6_mc_del_src(idev
, group
, pmc
->sfmode
, 0, NULL
, 0);
363 write_lock(&pmc
->sflock
);
369 goto done
; /* err = -EADDRNOTAVAIL */
371 for (i
= 0; i
< psl
->sl_count
; i
++) {
372 rv
= !ipv6_addr_equal(&psl
->sl_addr
[i
], source
);
376 if (rv
) /* source not found */
377 goto done
; /* err = -EADDRNOTAVAIL */
379 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
380 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
385 /* update the interface filter */
386 ip6_mc_del_src(idev
, group
, omode
, 1, source
, 1);
388 for (j
= i
+1; j
< psl
->sl_count
; j
++)
389 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
394 /* else, add a new source to the filter */
396 if (psl
&& psl
->sl_count
>= sysctl_mld_max_msf
) {
400 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
401 struct ip6_sf_socklist
*newpsl
;
402 int count
= IP6_SFBLOCK
;
405 count
+= psl
->sl_max
;
406 newpsl
= sock_kmalloc(sk
, IP6_SFLSIZE(count
), GFP_ATOMIC
);
411 newpsl
->sl_max
= count
;
412 newpsl
->sl_count
= count
- IP6_SFBLOCK
;
414 for (i
= 0; i
< psl
->sl_count
; i
++)
415 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
416 sock_kfree_s(sk
, psl
, IP6_SFLSIZE(psl
->sl_max
));
418 pmc
->sflist
= psl
= newpsl
;
420 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
421 for (i
= 0; i
< psl
->sl_count
; i
++) {
422 rv
= !ipv6_addr_equal(&psl
->sl_addr
[i
], source
);
423 if (rv
== 0) /* There is an error in the address. */
426 for (j
= psl
->sl_count
-1; j
>= i
; j
--)
427 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
428 psl
->sl_addr
[i
] = *source
;
431 /* update the interface list */
432 ip6_mc_add_src(idev
, group
, omode
, 1, source
, 1);
435 write_unlock(&pmc
->sflock
);
436 read_unlock_bh(&idev
->lock
);
439 err
= ipv6_sock_mc_drop(sk
, pgsr
->gsr_interface
, group
);
443 int ip6_mc_msfilter(struct sock
*sk
, struct group_filter
*gsf
)
445 const struct in6_addr
*group
;
446 struct ipv6_mc_socklist
*pmc
;
447 struct inet6_dev
*idev
;
448 struct ipv6_pinfo
*inet6
= inet6_sk(sk
);
449 struct ip6_sf_socklist
*newpsl
, *psl
;
450 struct net
*net
= sock_net(sk
);
454 group
= &((struct sockaddr_in6
*)&gsf
->gf_group
)->sin6_addr
;
456 if (!ipv6_addr_is_multicast(group
))
458 if (gsf
->gf_fmode
!= MCAST_INCLUDE
&&
459 gsf
->gf_fmode
!= MCAST_EXCLUDE
)
463 idev
= ip6_mc_find_dev_rcu(net
, group
, gsf
->gf_interface
);
472 if (gsf
->gf_fmode
== MCAST_INCLUDE
&& gsf
->gf_numsrc
== 0) {
477 for_each_pmc_rcu(inet6
, pmc
) {
478 if (pmc
->ifindex
!= gsf
->gf_interface
)
480 if (ipv6_addr_equal(&pmc
->addr
, group
))
483 if (!pmc
) { /* must have a prior join */
487 if (gsf
->gf_numsrc
) {
488 newpsl
= sock_kmalloc(sk
, IP6_SFLSIZE(gsf
->gf_numsrc
),
494 newpsl
->sl_max
= newpsl
->sl_count
= gsf
->gf_numsrc
;
495 for (i
= 0; i
< newpsl
->sl_count
; ++i
) {
496 struct sockaddr_in6
*psin6
;
498 psin6
= (struct sockaddr_in6
*)&gsf
->gf_slist
[i
];
499 newpsl
->sl_addr
[i
] = psin6
->sin6_addr
;
501 err
= ip6_mc_add_src(idev
, group
, gsf
->gf_fmode
,
502 newpsl
->sl_count
, newpsl
->sl_addr
, 0);
504 sock_kfree_s(sk
, newpsl
, IP6_SFLSIZE(newpsl
->sl_max
));
509 (void) ip6_mc_add_src(idev
, group
, gsf
->gf_fmode
, 0, NULL
, 0);
512 write_lock(&pmc
->sflock
);
515 (void) ip6_mc_del_src(idev
, group
, pmc
->sfmode
,
516 psl
->sl_count
, psl
->sl_addr
, 0);
517 sock_kfree_s(sk
, psl
, IP6_SFLSIZE(psl
->sl_max
));
519 (void) ip6_mc_del_src(idev
, group
, pmc
->sfmode
, 0, NULL
, 0);
520 pmc
->sflist
= newpsl
;
521 pmc
->sfmode
= gsf
->gf_fmode
;
522 write_unlock(&pmc
->sflock
);
525 read_unlock_bh(&idev
->lock
);
528 err
= ipv6_sock_mc_drop(sk
, gsf
->gf_interface
, group
);
532 int ip6_mc_msfget(struct sock
*sk
, struct group_filter
*gsf
,
533 struct group_filter __user
*optval
, int __user
*optlen
)
535 int err
, i
, count
, copycount
;
536 const struct in6_addr
*group
;
537 struct ipv6_mc_socklist
*pmc
;
538 struct inet6_dev
*idev
;
539 struct ipv6_pinfo
*inet6
= inet6_sk(sk
);
540 struct ip6_sf_socklist
*psl
;
541 struct net
*net
= sock_net(sk
);
543 group
= &((struct sockaddr_in6
*)&gsf
->gf_group
)->sin6_addr
;
545 if (!ipv6_addr_is_multicast(group
))
549 idev
= ip6_mc_find_dev_rcu(net
, group
, gsf
->gf_interface
);
556 err
= -EADDRNOTAVAIL
;
557 /* changes to the ipv6_mc_list require the socket lock and
558 * rtnl lock. We have the socket lock and rcu read lock,
559 * so reading the list is safe.
562 for_each_pmc_rcu(inet6
, pmc
) {
563 if (pmc
->ifindex
!= gsf
->gf_interface
)
565 if (ipv6_addr_equal(group
, &pmc
->addr
))
568 if (!pmc
) /* must have a prior join */
570 gsf
->gf_fmode
= pmc
->sfmode
;
572 count
= psl
? psl
->sl_count
: 0;
573 read_unlock_bh(&idev
->lock
);
576 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
577 gsf
->gf_numsrc
= count
;
578 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
579 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
582 /* changes to psl require the socket lock, and a write lock
583 * on pmc->sflock. We have the socket lock so reading here is safe.
585 for (i
= 0; i
< copycount
; i
++) {
586 struct sockaddr_in6
*psin6
;
587 struct sockaddr_storage ss
;
589 psin6
= (struct sockaddr_in6
*)&ss
;
590 memset(&ss
, 0, sizeof(ss
));
591 psin6
->sin6_family
= AF_INET6
;
592 psin6
->sin6_addr
= psl
->sl_addr
[i
];
593 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
598 read_unlock_bh(&idev
->lock
);
603 bool inet6_mc_check(struct sock
*sk
, const struct in6_addr
*mc_addr
,
604 const struct in6_addr
*src_addr
)
606 struct ipv6_pinfo
*np
= inet6_sk(sk
);
607 struct ipv6_mc_socklist
*mc
;
608 struct ip6_sf_socklist
*psl
;
612 for_each_pmc_rcu(np
, mc
) {
613 if (ipv6_addr_equal(&mc
->addr
, mc_addr
))
620 read_lock(&mc
->sflock
);
623 rv
= mc
->sfmode
== MCAST_EXCLUDE
;
627 for (i
= 0; i
< psl
->sl_count
; i
++) {
628 if (ipv6_addr_equal(&psl
->sl_addr
[i
], src_addr
))
631 if (mc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
633 if (mc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
636 read_unlock(&mc
->sflock
);
642 static void igmp6_group_added(struct ifmcaddr6
*mc
)
644 struct net_device
*dev
= mc
->idev
->dev
;
645 char buf
[MAX_ADDR_LEN
];
647 if (IPV6_ADDR_MC_SCOPE(&mc
->mca_addr
) <
648 IPV6_ADDR_SCOPE_LINKLOCAL
)
651 spin_lock_bh(&mc
->mca_lock
);
652 if (!(mc
->mca_flags
&MAF_LOADED
)) {
653 mc
->mca_flags
|= MAF_LOADED
;
654 if (ndisc_mc_map(&mc
->mca_addr
, buf
, dev
, 0) == 0)
655 dev_mc_add(dev
, buf
);
657 spin_unlock_bh(&mc
->mca_lock
);
659 if (!(dev
->flags
& IFF_UP
) || (mc
->mca_flags
& MAF_NOREPORT
))
662 if (mld_in_v1_mode(mc
->idev
)) {
663 igmp6_join_group(mc
);
668 mc
->mca_crcount
= mc
->idev
->mc_qrv
;
669 mld_ifc_event(mc
->idev
);
672 static void igmp6_group_dropped(struct ifmcaddr6
*mc
)
674 struct net_device
*dev
= mc
->idev
->dev
;
675 char buf
[MAX_ADDR_LEN
];
677 if (IPV6_ADDR_MC_SCOPE(&mc
->mca_addr
) <
678 IPV6_ADDR_SCOPE_LINKLOCAL
)
681 spin_lock_bh(&mc
->mca_lock
);
682 if (mc
->mca_flags
&MAF_LOADED
) {
683 mc
->mca_flags
&= ~MAF_LOADED
;
684 if (ndisc_mc_map(&mc
->mca_addr
, buf
, dev
, 0) == 0)
685 dev_mc_del(dev
, buf
);
688 if (mc
->mca_flags
& MAF_NOREPORT
)
690 spin_unlock_bh(&mc
->mca_lock
);
693 igmp6_leave_group(mc
);
695 spin_lock_bh(&mc
->mca_lock
);
696 if (del_timer(&mc
->mca_timer
))
697 atomic_dec(&mc
->mca_refcnt
);
699 ip6_mc_clear_src(mc
);
700 spin_unlock_bh(&mc
->mca_lock
);
704 * deleted ifmcaddr6 manipulation
706 static void mld_add_delrec(struct inet6_dev
*idev
, struct ifmcaddr6
*im
)
708 struct ifmcaddr6
*pmc
;
710 /* this is an "ifmcaddr6" for convenience; only the fields below
711 * are actually used. In particular, the refcnt and users are not
712 * used for management of the delete list. Using the same structure
713 * for deleted items allows change reports to use common code with
714 * non-deleted or query-response MCA's.
716 pmc
= kzalloc(sizeof(*pmc
), GFP_ATOMIC
);
720 spin_lock_bh(&im
->mca_lock
);
721 spin_lock_init(&pmc
->mca_lock
);
722 pmc
->idev
= im
->idev
;
724 pmc
->mca_addr
= im
->mca_addr
;
725 pmc
->mca_crcount
= idev
->mc_qrv
;
726 pmc
->mca_sfmode
= im
->mca_sfmode
;
727 if (pmc
->mca_sfmode
== MCAST_INCLUDE
) {
728 struct ip6_sf_list
*psf
;
730 pmc
->mca_tomb
= im
->mca_tomb
;
731 pmc
->mca_sources
= im
->mca_sources
;
732 im
->mca_tomb
= im
->mca_sources
= NULL
;
733 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
)
734 psf
->sf_crcount
= pmc
->mca_crcount
;
736 spin_unlock_bh(&im
->mca_lock
);
738 spin_lock_bh(&idev
->mc_lock
);
739 pmc
->next
= idev
->mc_tomb
;
741 spin_unlock_bh(&idev
->mc_lock
);
744 static void mld_del_delrec(struct inet6_dev
*idev
, const struct in6_addr
*pmca
)
746 struct ifmcaddr6
*pmc
, *pmc_prev
;
747 struct ip6_sf_list
*psf
, *psf_next
;
749 spin_lock_bh(&idev
->mc_lock
);
751 for (pmc
= idev
->mc_tomb
; pmc
; pmc
= pmc
->next
) {
752 if (ipv6_addr_equal(&pmc
->mca_addr
, pmca
))
758 pmc_prev
->next
= pmc
->next
;
760 idev
->mc_tomb
= pmc
->next
;
762 spin_unlock_bh(&idev
->mc_lock
);
765 for (psf
= pmc
->mca_tomb
; psf
; psf
= psf_next
) {
766 psf_next
= psf
->sf_next
;
769 in6_dev_put(pmc
->idev
);
774 static void mld_clear_delrec(struct inet6_dev
*idev
)
776 struct ifmcaddr6
*pmc
, *nextpmc
;
778 spin_lock_bh(&idev
->mc_lock
);
780 idev
->mc_tomb
= NULL
;
781 spin_unlock_bh(&idev
->mc_lock
);
783 for (; pmc
; pmc
= nextpmc
) {
785 ip6_mc_clear_src(pmc
);
786 in6_dev_put(pmc
->idev
);
790 /* clear dead sources, too */
791 read_lock_bh(&idev
->lock
);
792 for (pmc
= idev
->mc_list
; pmc
; pmc
= pmc
->next
) {
793 struct ip6_sf_list
*psf
, *psf_next
;
795 spin_lock_bh(&pmc
->mca_lock
);
797 pmc
->mca_tomb
= NULL
;
798 spin_unlock_bh(&pmc
->mca_lock
);
799 for (; psf
; psf
= psf_next
) {
800 psf_next
= psf
->sf_next
;
804 read_unlock_bh(&idev
->lock
);
807 static void mca_get(struct ifmcaddr6
*mc
)
809 atomic_inc(&mc
->mca_refcnt
);
812 static void ma_put(struct ifmcaddr6
*mc
)
814 if (atomic_dec_and_test(&mc
->mca_refcnt
)) {
815 in6_dev_put(mc
->idev
);
820 static struct ifmcaddr6
*mca_alloc(struct inet6_dev
*idev
,
821 const struct in6_addr
*addr
)
823 struct ifmcaddr6
*mc
;
825 mc
= kzalloc(sizeof(*mc
), GFP_ATOMIC
);
829 setup_timer(&mc
->mca_timer
, igmp6_timer_handler
, (unsigned long)mc
);
831 mc
->mca_addr
= *addr
;
832 mc
->idev
= idev
; /* reference taken by caller */
834 /* mca_stamp should be updated upon changes */
835 mc
->mca_cstamp
= mc
->mca_tstamp
= jiffies
;
836 atomic_set(&mc
->mca_refcnt
, 1);
837 spin_lock_init(&mc
->mca_lock
);
839 /* initial mode is (EX, empty) */
840 mc
->mca_sfmode
= MCAST_EXCLUDE
;
841 mc
->mca_sfcount
[MCAST_EXCLUDE
] = 1;
843 if (ipv6_addr_is_ll_all_nodes(&mc
->mca_addr
) ||
844 IPV6_ADDR_MC_SCOPE(&mc
->mca_addr
) < IPV6_ADDR_SCOPE_LINKLOCAL
)
845 mc
->mca_flags
|= MAF_NOREPORT
;
851 * device multicast group inc (add if not found)
853 int ipv6_dev_mc_inc(struct net_device
*dev
, const struct in6_addr
*addr
)
855 struct ifmcaddr6
*mc
;
856 struct inet6_dev
*idev
;
860 /* we need to take a reference on idev */
861 idev
= in6_dev_get(dev
);
866 write_lock_bh(&idev
->lock
);
868 write_unlock_bh(&idev
->lock
);
873 for (mc
= idev
->mc_list
; mc
; mc
= mc
->next
) {
874 if (ipv6_addr_equal(&mc
->mca_addr
, addr
)) {
876 write_unlock_bh(&idev
->lock
);
877 ip6_mc_add_src(idev
, &mc
->mca_addr
, MCAST_EXCLUDE
, 0,
884 mc
= mca_alloc(idev
, addr
);
886 write_unlock_bh(&idev
->lock
);
891 mc
->next
= idev
->mc_list
;
894 /* Hold this for the code below before we unlock,
895 * it is already exposed via idev->mc_list.
898 write_unlock_bh(&idev
->lock
);
900 mld_del_delrec(idev
, &mc
->mca_addr
);
901 igmp6_group_added(mc
);
907 * device multicast group del
909 int __ipv6_dev_mc_dec(struct inet6_dev
*idev
, const struct in6_addr
*addr
)
911 struct ifmcaddr6
*ma
, **map
;
915 write_lock_bh(&idev
->lock
);
916 for (map
= &idev
->mc_list
; (ma
= *map
) != NULL
; map
= &ma
->next
) {
917 if (ipv6_addr_equal(&ma
->mca_addr
, addr
)) {
918 if (--ma
->mca_users
== 0) {
920 write_unlock_bh(&idev
->lock
);
922 igmp6_group_dropped(ma
);
927 write_unlock_bh(&idev
->lock
);
931 write_unlock_bh(&idev
->lock
);
936 int ipv6_dev_mc_dec(struct net_device
*dev
, const struct in6_addr
*addr
)
938 struct inet6_dev
*idev
;
943 idev
= __in6_dev_get(dev
);
947 err
= __ipv6_dev_mc_dec(idev
, addr
);
953 * check if the interface/address pair is valid
955 bool ipv6_chk_mcast_addr(struct net_device
*dev
, const struct in6_addr
*group
,
956 const struct in6_addr
*src_addr
)
958 struct inet6_dev
*idev
;
959 struct ifmcaddr6
*mc
;
963 idev
= __in6_dev_get(dev
);
965 read_lock_bh(&idev
->lock
);
966 for (mc
= idev
->mc_list
; mc
; mc
= mc
->next
) {
967 if (ipv6_addr_equal(&mc
->mca_addr
, group
))
971 if (src_addr
&& !ipv6_addr_any(src_addr
)) {
972 struct ip6_sf_list
*psf
;
974 spin_lock_bh(&mc
->mca_lock
);
975 for (psf
= mc
->mca_sources
; psf
; psf
= psf
->sf_next
) {
976 if (ipv6_addr_equal(&psf
->sf_addr
, src_addr
))
980 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
981 psf
->sf_count
[MCAST_EXCLUDE
] !=
982 mc
->mca_sfcount
[MCAST_EXCLUDE
];
984 rv
= mc
->mca_sfcount
[MCAST_EXCLUDE
] != 0;
985 spin_unlock_bh(&mc
->mca_lock
);
987 rv
= true; /* don't filter unspecified source */
989 read_unlock_bh(&idev
->lock
);
995 static void mld_gq_start_timer(struct inet6_dev
*idev
)
997 unsigned long tv
= prandom_u32() % idev
->mc_maxdelay
;
999 idev
->mc_gq_running
= 1;
1000 if (!mod_timer(&idev
->mc_gq_timer
, jiffies
+tv
+2))
1004 static void mld_gq_stop_timer(struct inet6_dev
*idev
)
1006 idev
->mc_gq_running
= 0;
1007 if (del_timer(&idev
->mc_gq_timer
))
1008 __in6_dev_put(idev
);
1011 static void mld_ifc_start_timer(struct inet6_dev
*idev
, unsigned long delay
)
1013 unsigned long tv
= prandom_u32() % delay
;
1015 if (!mod_timer(&idev
->mc_ifc_timer
, jiffies
+tv
+2))
1019 static void mld_ifc_stop_timer(struct inet6_dev
*idev
)
1021 idev
->mc_ifc_count
= 0;
1022 if (del_timer(&idev
->mc_ifc_timer
))
1023 __in6_dev_put(idev
);
1026 static void mld_dad_start_timer(struct inet6_dev
*idev
, unsigned long delay
)
1028 unsigned long tv
= prandom_u32() % delay
;
1030 if (!mod_timer(&idev
->mc_dad_timer
, jiffies
+tv
+2))
1034 static void mld_dad_stop_timer(struct inet6_dev
*idev
)
1036 if (del_timer(&idev
->mc_dad_timer
))
1037 __in6_dev_put(idev
);
1041 * IGMP handling (alias multicast ICMPv6 messages)
1044 static void igmp6_group_queried(struct ifmcaddr6
*ma
, unsigned long resptime
)
1046 unsigned long delay
= resptime
;
1048 /* Do not start timer for these addresses */
1049 if (ipv6_addr_is_ll_all_nodes(&ma
->mca_addr
) ||
1050 IPV6_ADDR_MC_SCOPE(&ma
->mca_addr
) < IPV6_ADDR_SCOPE_LINKLOCAL
)
1053 if (del_timer(&ma
->mca_timer
)) {
1054 atomic_dec(&ma
->mca_refcnt
);
1055 delay
= ma
->mca_timer
.expires
- jiffies
;
1058 if (delay
>= resptime
)
1059 delay
= prandom_u32() % resptime
;
1061 ma
->mca_timer
.expires
= jiffies
+ delay
;
1062 if (!mod_timer(&ma
->mca_timer
, jiffies
+ delay
))
1063 atomic_inc(&ma
->mca_refcnt
);
1064 ma
->mca_flags
|= MAF_TIMER_RUNNING
;
1067 /* mark EXCLUDE-mode sources */
1068 static bool mld_xmarksources(struct ifmcaddr6
*pmc
, int nsrcs
,
1069 const struct in6_addr
*srcs
)
1071 struct ip6_sf_list
*psf
;
1075 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
) {
1076 if (scount
== nsrcs
)
1078 for (i
= 0; i
< nsrcs
; i
++) {
1079 /* skip inactive filters */
1080 if (psf
->sf_count
[MCAST_INCLUDE
] ||
1081 pmc
->mca_sfcount
[MCAST_EXCLUDE
] !=
1082 psf
->sf_count
[MCAST_EXCLUDE
])
1084 if (ipv6_addr_equal(&srcs
[i
], &psf
->sf_addr
)) {
1090 pmc
->mca_flags
&= ~MAF_GSQUERY
;
1091 if (scount
== nsrcs
) /* all sources excluded */
1096 static bool mld_marksources(struct ifmcaddr6
*pmc
, int nsrcs
,
1097 const struct in6_addr
*srcs
)
1099 struct ip6_sf_list
*psf
;
1102 if (pmc
->mca_sfmode
== MCAST_EXCLUDE
)
1103 return mld_xmarksources(pmc
, nsrcs
, srcs
);
1105 /* mark INCLUDE-mode sources */
1108 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
) {
1109 if (scount
== nsrcs
)
1111 for (i
= 0; i
< nsrcs
; i
++) {
1112 if (ipv6_addr_equal(&srcs
[i
], &psf
->sf_addr
)) {
1120 pmc
->mca_flags
&= ~MAF_GSQUERY
;
1123 pmc
->mca_flags
|= MAF_GSQUERY
;
1127 static int mld_force_mld_version(const struct inet6_dev
*idev
)
1129 /* Normally, both are 0 here. If enforcement to a particular is
1130 * being used, individual device enforcement will have a lower
1131 * precedence over 'all' device (.../conf/all/force_mld_version).
1134 if (dev_net(idev
->dev
)->ipv6
.devconf_all
->force_mld_version
!= 0)
1135 return dev_net(idev
->dev
)->ipv6
.devconf_all
->force_mld_version
;
1137 return idev
->cnf
.force_mld_version
;
1140 static bool mld_in_v2_mode_only(const struct inet6_dev
*idev
)
1142 return mld_force_mld_version(idev
) == 2;
1145 static bool mld_in_v1_mode_only(const struct inet6_dev
*idev
)
1147 return mld_force_mld_version(idev
) == 1;
1150 static bool mld_in_v1_mode(const struct inet6_dev
*idev
)
1152 if (mld_in_v2_mode_only(idev
))
1154 if (mld_in_v1_mode_only(idev
))
1156 if (idev
->mc_v1_seen
&& time_before(jiffies
, idev
->mc_v1_seen
))
1162 static void mld_set_v1_mode(struct inet6_dev
*idev
)
1164 /* RFC3810, relevant sections:
1165 * - 9.1. Robustness Variable
1166 * - 9.2. Query Interval
1167 * - 9.3. Query Response Interval
1168 * - 9.12. Older Version Querier Present Timeout
1170 unsigned long switchback
;
1172 switchback
= (idev
->mc_qrv
* idev
->mc_qi
) + idev
->mc_qri
;
1174 idev
->mc_v1_seen
= jiffies
+ switchback
;
1177 static void mld_update_qrv(struct inet6_dev
*idev
,
1178 const struct mld2_query
*mlh2
)
1180 /* RFC3810, relevant sections:
1181 * - 5.1.8. QRV (Querier's Robustness Variable)
1182 * - 9.1. Robustness Variable
1185 /* The value of the Robustness Variable MUST NOT be zero,
1186 * and SHOULD NOT be one. Catch this here if we ever run
1187 * into such a case in future.
1189 const int min_qrv
= min(MLD_QRV_DEFAULT
, sysctl_mld_qrv
);
1190 WARN_ON(idev
->mc_qrv
== 0);
1192 if (mlh2
->mld2q_qrv
> 0)
1193 idev
->mc_qrv
= mlh2
->mld2q_qrv
;
1195 if (unlikely(idev
->mc_qrv
< min_qrv
)) {
1196 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1197 idev
->mc_qrv
, min_qrv
);
1198 idev
->mc_qrv
= min_qrv
;
1202 static void mld_update_qi(struct inet6_dev
*idev
,
1203 const struct mld2_query
*mlh2
)
1205 /* RFC3810, relevant sections:
1206 * - 5.1.9. QQIC (Querier's Query Interval Code)
1207 * - 9.2. Query Interval
1208 * - 9.12. Older Version Querier Present Timeout
1209 * (the [Query Interval] in the last Query received)
1211 unsigned long mc_qqi
;
1213 if (mlh2
->mld2q_qqic
< 128) {
1214 mc_qqi
= mlh2
->mld2q_qqic
;
1216 unsigned long mc_man
, mc_exp
;
1218 mc_exp
= MLDV2_QQIC_EXP(mlh2
->mld2q_qqic
);
1219 mc_man
= MLDV2_QQIC_MAN(mlh2
->mld2q_qqic
);
1221 mc_qqi
= (mc_man
| 0x10) << (mc_exp
+ 3);
1224 idev
->mc_qi
= mc_qqi
* HZ
;
1227 static void mld_update_qri(struct inet6_dev
*idev
,
1228 const struct mld2_query
*mlh2
)
1230 /* RFC3810, relevant sections:
1231 * - 5.1.3. Maximum Response Code
1232 * - 9.3. Query Response Interval
1234 idev
->mc_qri
= msecs_to_jiffies(mldv2_mrc(mlh2
));
1237 static int mld_process_v1(struct inet6_dev
*idev
, struct mld_msg
*mld
,
1238 unsigned long *max_delay
, bool v1_query
)
1240 unsigned long mldv1_md
;
1242 /* Ignore v1 queries */
1243 if (mld_in_v2_mode_only(idev
))
1246 mldv1_md
= ntohs(mld
->mld_maxdelay
);
1248 /* When in MLDv1 fallback and a MLDv2 router start-up being
1249 * unaware of current MLDv1 operation, the MRC == MRD mapping
1250 * only works when the exponential algorithm is not being
1251 * used (as MLDv1 is unaware of such things).
1253 * According to the RFC author, the MLDv2 implementations
1254 * he's aware of all use a MRC < 32768 on start up queries.
1256 * Thus, should we *ever* encounter something else larger
1257 * than that, just assume the maximum possible within our
1261 mldv1_md
= min(mldv1_md
, MLDV1_MRD_MAX_COMPAT
);
1263 *max_delay
= max(msecs_to_jiffies(mldv1_md
), 1UL);
1265 /* MLDv1 router present: we need to go into v1 mode *only*
1266 * when an MLDv1 query is received as per section 9.12. of
1267 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1268 * queries MUST be of exactly 24 octets.
1271 mld_set_v1_mode(idev
);
1273 /* cancel MLDv2 report timer */
1274 mld_gq_stop_timer(idev
);
1275 /* cancel the interface change timer */
1276 mld_ifc_stop_timer(idev
);
1277 /* clear deleted report items */
1278 mld_clear_delrec(idev
);
1283 static int mld_process_v2(struct inet6_dev
*idev
, struct mld2_query
*mld
,
1284 unsigned long *max_delay
)
1286 *max_delay
= max(msecs_to_jiffies(mldv2_mrc(mld
)), 1UL);
1288 mld_update_qrv(idev
, mld
);
1289 mld_update_qi(idev
, mld
);
1290 mld_update_qri(idev
, mld
);
1292 idev
->mc_maxdelay
= *max_delay
;
1297 /* called with rcu_read_lock() */
1298 int igmp6_event_query(struct sk_buff
*skb
)
1300 struct mld2_query
*mlh2
= NULL
;
1301 struct ifmcaddr6
*ma
;
1302 const struct in6_addr
*group
;
1303 unsigned long max_delay
;
1304 struct inet6_dev
*idev
;
1305 struct mld_msg
*mld
;
1310 if (!pskb_may_pull(skb
, sizeof(struct in6_addr
)))
1313 /* compute payload length excluding extension headers */
1314 len
= ntohs(ipv6_hdr(skb
)->payload_len
) + sizeof(struct ipv6hdr
);
1315 len
-= skb_network_header_len(skb
);
1318 * Upon reception of an MLD message that contains a Query, the node
1319 * checks if the source address of the message is a valid link-local
1320 * address, if the Hop Limit is set to 1, and if the Router Alert
1321 * option is present in the Hop-By-Hop Options header of the IPv6
1322 * packet. If any of these checks fails, the packet is dropped.
1324 if (!(ipv6_addr_type(&ipv6_hdr(skb
)->saddr
) & IPV6_ADDR_LINKLOCAL
) ||
1325 ipv6_hdr(skb
)->hop_limit
!= 1 ||
1326 !(IP6CB(skb
)->flags
& IP6SKB_ROUTERALERT
) ||
1327 IP6CB(skb
)->ra
!= htons(IPV6_OPT_ROUTERALERT_MLD
))
1330 idev
= __in6_dev_get(skb
->dev
);
1334 mld
= (struct mld_msg
*)icmp6_hdr(skb
);
1335 group
= &mld
->mld_mca
;
1336 group_type
= ipv6_addr_type(group
);
1338 if (group_type
!= IPV6_ADDR_ANY
&&
1339 !(group_type
&IPV6_ADDR_MULTICAST
))
1342 if (len
< MLD_V1_QUERY_LEN
) {
1344 } else if (len
== MLD_V1_QUERY_LEN
|| mld_in_v1_mode(idev
)) {
1345 err
= mld_process_v1(idev
, mld
, &max_delay
,
1346 len
== MLD_V1_QUERY_LEN
);
1349 } else if (len
>= MLD_V2_QUERY_LEN_MIN
) {
1350 int srcs_offset
= sizeof(struct mld2_query
) -
1351 sizeof(struct icmp6hdr
);
1353 if (!pskb_may_pull(skb
, srcs_offset
))
1356 mlh2
= (struct mld2_query
*)skb_transport_header(skb
);
1358 err
= mld_process_v2(idev
, mlh2
, &max_delay
);
1362 if (group_type
== IPV6_ADDR_ANY
) { /* general query */
1363 if (mlh2
->mld2q_nsrcs
)
1364 return -EINVAL
; /* no sources allowed */
1366 mld_gq_start_timer(idev
);
1369 /* mark sources to include, if group & source-specific */
1370 if (mlh2
->mld2q_nsrcs
!= 0) {
1371 if (!pskb_may_pull(skb
, srcs_offset
+
1372 ntohs(mlh2
->mld2q_nsrcs
) * sizeof(struct in6_addr
)))
1375 mlh2
= (struct mld2_query
*)skb_transport_header(skb
);
1382 read_lock_bh(&idev
->lock
);
1383 if (group_type
== IPV6_ADDR_ANY
) {
1384 for (ma
= idev
->mc_list
; ma
; ma
= ma
->next
) {
1385 spin_lock_bh(&ma
->mca_lock
);
1386 igmp6_group_queried(ma
, max_delay
);
1387 spin_unlock_bh(&ma
->mca_lock
);
1390 for (ma
= idev
->mc_list
; ma
; ma
= ma
->next
) {
1391 if (!ipv6_addr_equal(group
, &ma
->mca_addr
))
1393 spin_lock_bh(&ma
->mca_lock
);
1394 if (ma
->mca_flags
& MAF_TIMER_RUNNING
) {
1395 /* gsquery <- gsquery && mark */
1397 ma
->mca_flags
&= ~MAF_GSQUERY
;
1399 /* gsquery <- mark */
1401 ma
->mca_flags
|= MAF_GSQUERY
;
1403 ma
->mca_flags
&= ~MAF_GSQUERY
;
1405 if (!(ma
->mca_flags
& MAF_GSQUERY
) ||
1406 mld_marksources(ma
, ntohs(mlh2
->mld2q_nsrcs
), mlh2
->mld2q_srcs
))
1407 igmp6_group_queried(ma
, max_delay
);
1408 spin_unlock_bh(&ma
->mca_lock
);
1412 read_unlock_bh(&idev
->lock
);
1417 /* called with rcu_read_lock() */
1418 int igmp6_event_report(struct sk_buff
*skb
)
1420 struct ifmcaddr6
*ma
;
1421 struct inet6_dev
*idev
;
1422 struct mld_msg
*mld
;
1425 /* Our own report looped back. Ignore it. */
1426 if (skb
->pkt_type
== PACKET_LOOPBACK
)
1429 /* send our report if the MC router may not have heard this report */
1430 if (skb
->pkt_type
!= PACKET_MULTICAST
&&
1431 skb
->pkt_type
!= PACKET_BROADCAST
)
1434 if (!pskb_may_pull(skb
, sizeof(*mld
) - sizeof(struct icmp6hdr
)))
1437 mld
= (struct mld_msg
*)icmp6_hdr(skb
);
1439 /* Drop reports with not link local source */
1440 addr_type
= ipv6_addr_type(&ipv6_hdr(skb
)->saddr
);
1441 if (addr_type
!= IPV6_ADDR_ANY
&&
1442 !(addr_type
&IPV6_ADDR_LINKLOCAL
))
1445 idev
= __in6_dev_get(skb
->dev
);
1450 * Cancel the timer for this group
1453 read_lock_bh(&idev
->lock
);
1454 for (ma
= idev
->mc_list
; ma
; ma
= ma
->next
) {
1455 if (ipv6_addr_equal(&ma
->mca_addr
, &mld
->mld_mca
)) {
1456 spin_lock(&ma
->mca_lock
);
1457 if (del_timer(&ma
->mca_timer
))
1458 atomic_dec(&ma
->mca_refcnt
);
1459 ma
->mca_flags
&= ~(MAF_LAST_REPORTER
|MAF_TIMER_RUNNING
);
1460 spin_unlock(&ma
->mca_lock
);
1464 read_unlock_bh(&idev
->lock
);
1468 static bool is_in(struct ifmcaddr6
*pmc
, struct ip6_sf_list
*psf
, int type
,
1469 int gdeleted
, int sdeleted
)
1472 case MLD2_MODE_IS_INCLUDE
:
1473 case MLD2_MODE_IS_EXCLUDE
:
1474 if (gdeleted
|| sdeleted
)
1476 if (!((pmc
->mca_flags
& MAF_GSQUERY
) && !psf
->sf_gsresp
)) {
1477 if (pmc
->mca_sfmode
== MCAST_INCLUDE
)
1479 /* don't include if this source is excluded
1482 if (psf
->sf_count
[MCAST_INCLUDE
])
1483 return type
== MLD2_MODE_IS_INCLUDE
;
1484 return pmc
->mca_sfcount
[MCAST_EXCLUDE
] ==
1485 psf
->sf_count
[MCAST_EXCLUDE
];
1488 case MLD2_CHANGE_TO_INCLUDE
:
1489 if (gdeleted
|| sdeleted
)
1491 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
1492 case MLD2_CHANGE_TO_EXCLUDE
:
1493 if (gdeleted
|| sdeleted
)
1495 if (pmc
->mca_sfcount
[MCAST_EXCLUDE
] == 0 ||
1496 psf
->sf_count
[MCAST_INCLUDE
])
1498 return pmc
->mca_sfcount
[MCAST_EXCLUDE
] ==
1499 psf
->sf_count
[MCAST_EXCLUDE
];
1500 case MLD2_ALLOW_NEW_SOURCES
:
1501 if (gdeleted
|| !psf
->sf_crcount
)
1503 return (pmc
->mca_sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
1504 case MLD2_BLOCK_OLD_SOURCES
:
1505 if (pmc
->mca_sfmode
== MCAST_INCLUDE
)
1506 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
1507 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
1513 mld_scount(struct ifmcaddr6
*pmc
, int type
, int gdeleted
, int sdeleted
)
1515 struct ip6_sf_list
*psf
;
1518 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
) {
1519 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
1526 static void ip6_mc_hdr(struct sock
*sk
, struct sk_buff
*skb
,
1527 struct net_device
*dev
,
1528 const struct in6_addr
*saddr
,
1529 const struct in6_addr
*daddr
,
1532 struct ipv6hdr
*hdr
;
1534 skb
->protocol
= htons(ETH_P_IPV6
);
1537 skb_reset_network_header(skb
);
1538 skb_put(skb
, sizeof(struct ipv6hdr
));
1539 hdr
= ipv6_hdr(skb
);
1541 ip6_flow_hdr(hdr
, 0, 0);
1543 hdr
->payload_len
= htons(len
);
1544 hdr
->nexthdr
= proto
;
1545 hdr
->hop_limit
= inet6_sk(sk
)->hop_limit
;
1547 hdr
->saddr
= *saddr
;
1548 hdr
->daddr
= *daddr
;
1551 static struct sk_buff
*mld_newpack(struct inet6_dev
*idev
, unsigned int mtu
)
1553 struct net_device
*dev
= idev
->dev
;
1554 struct net
*net
= dev_net(dev
);
1555 struct sock
*sk
= net
->ipv6
.igmp_sk
;
1556 struct sk_buff
*skb
;
1557 struct mld2_report
*pmr
;
1558 struct in6_addr addr_buf
;
1559 const struct in6_addr
*saddr
;
1560 int hlen
= LL_RESERVED_SPACE(dev
);
1561 int tlen
= dev
->needed_tailroom
;
1562 unsigned int size
= mtu
+ hlen
+ tlen
;
1564 u8 ra
[8] = { IPPROTO_ICMPV6
, 0,
1565 IPV6_TLV_ROUTERALERT
, 2, 0, 0,
1568 /* we assume size > sizeof(ra) here */
1569 /* limit our allocations to order-0 page */
1570 size
= min_t(int, size
, SKB_MAX_ORDER(0, 0));
1571 skb
= sock_alloc_send_skb(sk
, size
, 1, &err
);
1576 skb
->priority
= TC_PRIO_CONTROL
;
1577 skb_reserve(skb
, hlen
);
1578 skb_tailroom_reserve(skb
, mtu
, tlen
);
1580 if (__ipv6_get_lladdr(idev
, &addr_buf
, IFA_F_TENTATIVE
)) {
1581 /* <draft-ietf-magma-mld-source-05.txt>:
1582 * use unspecified address as the source address
1583 * when a valid link-local address is not available.
1585 saddr
= &in6addr_any
;
1589 ip6_mc_hdr(sk
, skb
, dev
, saddr
, &mld2_all_mcr
, NEXTHDR_HOP
, 0);
1591 memcpy(skb_put(skb
, sizeof(ra
)), ra
, sizeof(ra
));
1593 skb_set_transport_header(skb
, skb_tail_pointer(skb
) - skb
->data
);
1594 skb_put(skb
, sizeof(*pmr
));
1595 pmr
= (struct mld2_report
*)skb_transport_header(skb
);
1596 pmr
->mld2r_type
= ICMPV6_MLD2_REPORT
;
1597 pmr
->mld2r_resv1
= 0;
1598 pmr
->mld2r_cksum
= 0;
1599 pmr
->mld2r_resv2
= 0;
1600 pmr
->mld2r_ngrec
= 0;
1604 static void mld_sendpack(struct sk_buff
*skb
)
1606 struct ipv6hdr
*pip6
= ipv6_hdr(skb
);
1607 struct mld2_report
*pmr
=
1608 (struct mld2_report
*)skb_transport_header(skb
);
1609 int payload_len
, mldlen
;
1610 struct inet6_dev
*idev
;
1611 struct net
*net
= dev_net(skb
->dev
);
1614 struct dst_entry
*dst
;
1617 idev
= __in6_dev_get(skb
->dev
);
1618 IP6_UPD_PO_STATS(net
, idev
, IPSTATS_MIB_OUT
, skb
->len
);
1620 payload_len
= (skb_tail_pointer(skb
) - skb_network_header(skb
)) -
1622 mldlen
= skb_tail_pointer(skb
) - skb_transport_header(skb
);
1623 pip6
->payload_len
= htons(payload_len
);
1625 pmr
->mld2r_cksum
= csum_ipv6_magic(&pip6
->saddr
, &pip6
->daddr
, mldlen
,
1627 csum_partial(skb_transport_header(skb
),
1630 icmpv6_flow_init(net
->ipv6
.igmp_sk
, &fl6
, ICMPV6_MLD2_REPORT
,
1631 &ipv6_hdr(skb
)->saddr
, &ipv6_hdr(skb
)->daddr
,
1633 dst
= icmp6_dst_alloc(skb
->dev
, &fl6
);
1640 skb_dst_set(skb
, dst
);
1644 payload_len
= skb
->len
;
1646 err
= NF_HOOK(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
,
1647 net
, net
->ipv6
.igmp_sk
, skb
, NULL
, skb
->dev
,
1651 ICMP6MSGOUT_INC_STATS(net
, idev
, ICMPV6_MLD2_REPORT
);
1652 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTMSGS
);
1654 IP6_INC_STATS(net
, idev
, IPSTATS_MIB_OUTDISCARDS
);
1665 static int grec_size(struct ifmcaddr6
*pmc
, int type
, int gdel
, int sdel
)
1667 return sizeof(struct mld2_grec
) + 16 * mld_scount(pmc
,type
,gdel
,sdel
);
1670 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ifmcaddr6
*pmc
,
1671 int type
, struct mld2_grec
**ppgr
)
1673 struct net_device
*dev
= pmc
->idev
->dev
;
1674 struct mld2_report
*pmr
;
1675 struct mld2_grec
*pgr
;
1678 skb
= mld_newpack(pmc
->idev
, dev
->mtu
);
1681 pgr
= (struct mld2_grec
*)skb_put(skb
, sizeof(struct mld2_grec
));
1682 pgr
->grec_type
= type
;
1683 pgr
->grec_auxwords
= 0;
1684 pgr
->grec_nsrcs
= 0;
1685 pgr
->grec_mca
= pmc
->mca_addr
; /* structure copy */
1686 pmr
= (struct mld2_report
*)skb_transport_header(skb
);
1687 pmr
->mld2r_ngrec
= htons(ntohs(pmr
->mld2r_ngrec
)+1);
1692 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1694 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ifmcaddr6
*pmc
,
1695 int type
, int gdeleted
, int sdeleted
, int crsend
)
1697 struct inet6_dev
*idev
= pmc
->idev
;
1698 struct net_device
*dev
= idev
->dev
;
1699 struct mld2_report
*pmr
;
1700 struct mld2_grec
*pgr
= NULL
;
1701 struct ip6_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
1702 int scount
, stotal
, first
, isquery
, truncate
;
1704 if (pmc
->mca_flags
& MAF_NOREPORT
)
1707 isquery
= type
== MLD2_MODE_IS_INCLUDE
||
1708 type
== MLD2_MODE_IS_EXCLUDE
;
1709 truncate
= type
== MLD2_MODE_IS_EXCLUDE
||
1710 type
== MLD2_CHANGE_TO_EXCLUDE
;
1712 stotal
= scount
= 0;
1714 psf_list
= sdeleted
? &pmc
->mca_tomb
: &pmc
->mca_sources
;
1719 pmr
= skb
? (struct mld2_report
*)skb_transport_header(skb
) : NULL
;
1721 /* EX and TO_EX get a fresh packet, if needed */
1723 if (pmr
&& pmr
->mld2r_ngrec
&&
1724 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
1727 skb
= mld_newpack(idev
, dev
->mtu
);
1732 for (psf
= *psf_list
; psf
; psf
= psf_next
) {
1733 struct in6_addr
*psrc
;
1735 psf_next
= psf
->sf_next
;
1737 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
1742 /* Based on RFC3810 6.1. Should not send source-list change
1743 * records when there is a filter mode change.
1745 if (((gdeleted
&& pmc
->mca_sfmode
== MCAST_EXCLUDE
) ||
1746 (!gdeleted
&& pmc
->mca_crcount
)) &&
1747 (type
== MLD2_ALLOW_NEW_SOURCES
||
1748 type
== MLD2_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
)
1749 goto decrease_sf_crcount
;
1751 /* clear marks on query responses */
1755 if (AVAILABLE(skb
) < sizeof(*psrc
) +
1756 first
*sizeof(struct mld2_grec
)) {
1757 if (truncate
&& !first
)
1758 break; /* truncate these */
1760 pgr
->grec_nsrcs
= htons(scount
);
1763 skb
= mld_newpack(idev
, dev
->mtu
);
1768 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
1773 psrc
= (struct in6_addr
*)skb_put(skb
, sizeof(*psrc
));
1774 *psrc
= psf
->sf_addr
;
1776 if ((type
== MLD2_ALLOW_NEW_SOURCES
||
1777 type
== MLD2_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
1778 decrease_sf_crcount
:
1780 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
1782 psf_prev
->sf_next
= psf
->sf_next
;
1784 *psf_list
= psf
->sf_next
;
1794 if (type
== MLD2_ALLOW_NEW_SOURCES
||
1795 type
== MLD2_BLOCK_OLD_SOURCES
)
1797 if (pmc
->mca_crcount
|| isquery
|| crsend
) {
1798 /* make sure we have room for group header */
1799 if (skb
&& AVAILABLE(skb
) < sizeof(struct mld2_grec
)) {
1801 skb
= NULL
; /* add_grhead will get a new one */
1803 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
1807 pgr
->grec_nsrcs
= htons(scount
);
1810 pmc
->mca_flags
&= ~MAF_GSQUERY
; /* clear query state */
1814 static void mld_send_report(struct inet6_dev
*idev
, struct ifmcaddr6
*pmc
)
1816 struct sk_buff
*skb
= NULL
;
1819 read_lock_bh(&idev
->lock
);
1821 for (pmc
= idev
->mc_list
; pmc
; pmc
= pmc
->next
) {
1822 if (pmc
->mca_flags
& MAF_NOREPORT
)
1824 spin_lock_bh(&pmc
->mca_lock
);
1825 if (pmc
->mca_sfcount
[MCAST_EXCLUDE
])
1826 type
= MLD2_MODE_IS_EXCLUDE
;
1828 type
= MLD2_MODE_IS_INCLUDE
;
1829 skb
= add_grec(skb
, pmc
, type
, 0, 0, 0);
1830 spin_unlock_bh(&pmc
->mca_lock
);
1833 spin_lock_bh(&pmc
->mca_lock
);
1834 if (pmc
->mca_sfcount
[MCAST_EXCLUDE
])
1835 type
= MLD2_MODE_IS_EXCLUDE
;
1837 type
= MLD2_MODE_IS_INCLUDE
;
1838 skb
= add_grec(skb
, pmc
, type
, 0, 0, 0);
1839 spin_unlock_bh(&pmc
->mca_lock
);
1841 read_unlock_bh(&idev
->lock
);
1847 * remove zero-count source records from a source filter list
1849 static void mld_clear_zeros(struct ip6_sf_list
**ppsf
)
1851 struct ip6_sf_list
*psf_prev
, *psf_next
, *psf
;
1854 for (psf
= *ppsf
; psf
; psf
= psf_next
) {
1855 psf_next
= psf
->sf_next
;
1856 if (psf
->sf_crcount
== 0) {
1858 psf_prev
->sf_next
= psf
->sf_next
;
1860 *ppsf
= psf
->sf_next
;
1867 static void mld_send_cr(struct inet6_dev
*idev
)
1869 struct ifmcaddr6
*pmc
, *pmc_prev
, *pmc_next
;
1870 struct sk_buff
*skb
= NULL
;
1873 read_lock_bh(&idev
->lock
);
1874 spin_lock(&idev
->mc_lock
);
1878 for (pmc
= idev
->mc_tomb
; pmc
; pmc
= pmc_next
) {
1879 pmc_next
= pmc
->next
;
1880 if (pmc
->mca_sfmode
== MCAST_INCLUDE
) {
1881 type
= MLD2_BLOCK_OLD_SOURCES
;
1882 dtype
= MLD2_BLOCK_OLD_SOURCES
;
1883 skb
= add_grec(skb
, pmc
, type
, 1, 0, 0);
1884 skb
= add_grec(skb
, pmc
, dtype
, 1, 1, 0);
1886 if (pmc
->mca_crcount
) {
1887 if (pmc
->mca_sfmode
== MCAST_EXCLUDE
) {
1888 type
= MLD2_CHANGE_TO_INCLUDE
;
1889 skb
= add_grec(skb
, pmc
, type
, 1, 0, 0);
1892 if (pmc
->mca_crcount
== 0) {
1893 mld_clear_zeros(&pmc
->mca_tomb
);
1894 mld_clear_zeros(&pmc
->mca_sources
);
1897 if (pmc
->mca_crcount
== 0 && !pmc
->mca_tomb
&&
1898 !pmc
->mca_sources
) {
1900 pmc_prev
->next
= pmc_next
;
1902 idev
->mc_tomb
= pmc_next
;
1903 in6_dev_put(pmc
->idev
);
1908 spin_unlock(&idev
->mc_lock
);
1911 for (pmc
= idev
->mc_list
; pmc
; pmc
= pmc
->next
) {
1912 spin_lock_bh(&pmc
->mca_lock
);
1913 if (pmc
->mca_sfcount
[MCAST_EXCLUDE
]) {
1914 type
= MLD2_BLOCK_OLD_SOURCES
;
1915 dtype
= MLD2_ALLOW_NEW_SOURCES
;
1917 type
= MLD2_ALLOW_NEW_SOURCES
;
1918 dtype
= MLD2_BLOCK_OLD_SOURCES
;
1920 skb
= add_grec(skb
, pmc
, type
, 0, 0, 0);
1921 skb
= add_grec(skb
, pmc
, dtype
, 0, 1, 0); /* deleted sources */
1923 /* filter mode changes */
1924 if (pmc
->mca_crcount
) {
1925 if (pmc
->mca_sfmode
== MCAST_EXCLUDE
)
1926 type
= MLD2_CHANGE_TO_EXCLUDE
;
1928 type
= MLD2_CHANGE_TO_INCLUDE
;
1929 skb
= add_grec(skb
, pmc
, type
, 0, 0, 0);
1932 spin_unlock_bh(&pmc
->mca_lock
);
1934 read_unlock_bh(&idev
->lock
);
1937 (void) mld_sendpack(skb
);
1940 static void igmp6_send(struct in6_addr
*addr
, struct net_device
*dev
, int type
)
1942 struct net
*net
= dev_net(dev
);
1943 struct sock
*sk
= net
->ipv6
.igmp_sk
;
1944 struct inet6_dev
*idev
;
1945 struct sk_buff
*skb
;
1946 struct mld_msg
*hdr
;
1947 const struct in6_addr
*snd_addr
, *saddr
;
1948 struct in6_addr addr_buf
;
1949 int hlen
= LL_RESERVED_SPACE(dev
);
1950 int tlen
= dev
->needed_tailroom
;
1951 int err
, len
, payload_len
, full_len
;
1952 u8 ra
[8] = { IPPROTO_ICMPV6
, 0,
1953 IPV6_TLV_ROUTERALERT
, 2, 0, 0,
1956 struct dst_entry
*dst
;
1958 if (type
== ICMPV6_MGM_REDUCTION
)
1959 snd_addr
= &in6addr_linklocal_allrouters
;
1963 len
= sizeof(struct icmp6hdr
) + sizeof(struct in6_addr
);
1964 payload_len
= len
+ sizeof(ra
);
1965 full_len
= sizeof(struct ipv6hdr
) + payload_len
;
1968 IP6_UPD_PO_STATS(net
, __in6_dev_get(dev
),
1969 IPSTATS_MIB_OUT
, full_len
);
1972 skb
= sock_alloc_send_skb(sk
, hlen
+ tlen
+ full_len
, 1, &err
);
1976 IP6_INC_STATS(net
, __in6_dev_get(dev
),
1977 IPSTATS_MIB_OUTDISCARDS
);
1981 skb
->priority
= TC_PRIO_CONTROL
;
1982 skb_reserve(skb
, hlen
);
1984 if (ipv6_get_lladdr(dev
, &addr_buf
, IFA_F_TENTATIVE
)) {
1985 /* <draft-ietf-magma-mld-source-05.txt>:
1986 * use unspecified address as the source address
1987 * when a valid link-local address is not available.
1989 saddr
= &in6addr_any
;
1993 ip6_mc_hdr(sk
, skb
, dev
, saddr
, snd_addr
, NEXTHDR_HOP
, payload_len
);
1995 memcpy(skb_put(skb
, sizeof(ra
)), ra
, sizeof(ra
));
1997 hdr
= (struct mld_msg
*) skb_put(skb
, sizeof(struct mld_msg
));
1998 memset(hdr
, 0, sizeof(struct mld_msg
));
1999 hdr
->mld_type
= type
;
2000 hdr
->mld_mca
= *addr
;
2002 hdr
->mld_cksum
= csum_ipv6_magic(saddr
, snd_addr
, len
,
2004 csum_partial(hdr
, len
, 0));
2007 idev
= __in6_dev_get(skb
->dev
);
2009 icmpv6_flow_init(sk
, &fl6
, type
,
2010 &ipv6_hdr(skb
)->saddr
, &ipv6_hdr(skb
)->daddr
,
2012 dst
= icmp6_dst_alloc(skb
->dev
, &fl6
);
2018 skb_dst_set(skb
, dst
);
2019 err
= NF_HOOK(NFPROTO_IPV6
, NF_INET_LOCAL_OUT
,
2020 net
, sk
, skb
, NULL
, skb
->dev
,
2024 ICMP6MSGOUT_INC_STATS(net
, idev
, type
);
2025 ICMP6_INC_STATS(net
, idev
, ICMP6_MIB_OUTMSGS
);
2027 IP6_INC_STATS(net
, idev
, IPSTATS_MIB_OUTDISCARDS
);
2037 static void mld_send_initial_cr(struct inet6_dev
*idev
)
2039 struct sk_buff
*skb
;
2040 struct ifmcaddr6
*pmc
;
2043 if (mld_in_v1_mode(idev
))
2047 read_lock_bh(&idev
->lock
);
2048 for (pmc
= idev
->mc_list
; pmc
; pmc
= pmc
->next
) {
2049 spin_lock_bh(&pmc
->mca_lock
);
2050 if (pmc
->mca_sfcount
[MCAST_EXCLUDE
])
2051 type
= MLD2_CHANGE_TO_EXCLUDE
;
2053 type
= MLD2_CHANGE_TO_INCLUDE
;
2054 skb
= add_grec(skb
, pmc
, type
, 0, 0, 1);
2055 spin_unlock_bh(&pmc
->mca_lock
);
2057 read_unlock_bh(&idev
->lock
);
2062 void ipv6_mc_dad_complete(struct inet6_dev
*idev
)
2064 idev
->mc_dad_count
= idev
->mc_qrv
;
2065 if (idev
->mc_dad_count
) {
2066 mld_send_initial_cr(idev
);
2067 idev
->mc_dad_count
--;
2068 if (idev
->mc_dad_count
)
2069 mld_dad_start_timer(idev
, idev
->mc_maxdelay
);
2073 static void mld_dad_timer_expire(unsigned long data
)
2075 struct inet6_dev
*idev
= (struct inet6_dev
*)data
;
2077 mld_send_initial_cr(idev
);
2078 if (idev
->mc_dad_count
) {
2079 idev
->mc_dad_count
--;
2080 if (idev
->mc_dad_count
)
2081 mld_dad_start_timer(idev
, idev
->mc_maxdelay
);
2086 static int ip6_mc_del1_src(struct ifmcaddr6
*pmc
, int sfmode
,
2087 const struct in6_addr
*psfsrc
)
2089 struct ip6_sf_list
*psf
, *psf_prev
;
2093 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
) {
2094 if (ipv6_addr_equal(&psf
->sf_addr
, psfsrc
))
2098 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
2099 /* source filter not found, or count wrong => bug */
2102 psf
->sf_count
[sfmode
]--;
2103 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
2104 struct inet6_dev
*idev
= pmc
->idev
;
2106 /* no more filters for this source */
2108 psf_prev
->sf_next
= psf
->sf_next
;
2110 pmc
->mca_sources
= psf
->sf_next
;
2111 if (psf
->sf_oldin
&& !(pmc
->mca_flags
& MAF_NOREPORT
) &&
2112 !mld_in_v1_mode(idev
)) {
2113 psf
->sf_crcount
= idev
->mc_qrv
;
2114 psf
->sf_next
= pmc
->mca_tomb
;
2115 pmc
->mca_tomb
= psf
;
2123 static int ip6_mc_del_src(struct inet6_dev
*idev
, const struct in6_addr
*pmca
,
2124 int sfmode
, int sfcount
, const struct in6_addr
*psfsrc
,
2127 struct ifmcaddr6
*pmc
;
2133 read_lock_bh(&idev
->lock
);
2134 for (pmc
= idev
->mc_list
; pmc
; pmc
= pmc
->next
) {
2135 if (ipv6_addr_equal(pmca
, &pmc
->mca_addr
))
2139 /* MCA not found?? bug */
2140 read_unlock_bh(&idev
->lock
);
2143 spin_lock_bh(&pmc
->mca_lock
);
2146 if (!pmc
->mca_sfcount
[sfmode
]) {
2147 spin_unlock_bh(&pmc
->mca_lock
);
2148 read_unlock_bh(&idev
->lock
);
2151 pmc
->mca_sfcount
[sfmode
]--;
2154 for (i
= 0; i
< sfcount
; i
++) {
2155 int rv
= ip6_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
2157 changerec
|= rv
> 0;
2161 if (pmc
->mca_sfmode
== MCAST_EXCLUDE
&&
2162 pmc
->mca_sfcount
[MCAST_EXCLUDE
] == 0 &&
2163 pmc
->mca_sfcount
[MCAST_INCLUDE
]) {
2164 struct ip6_sf_list
*psf
;
2166 /* filter mode change */
2167 pmc
->mca_sfmode
= MCAST_INCLUDE
;
2168 pmc
->mca_crcount
= idev
->mc_qrv
;
2169 idev
->mc_ifc_count
= pmc
->mca_crcount
;
2170 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
)
2171 psf
->sf_crcount
= 0;
2172 mld_ifc_event(pmc
->idev
);
2173 } else if (sf_setstate(pmc
) || changerec
)
2174 mld_ifc_event(pmc
->idev
);
2175 spin_unlock_bh(&pmc
->mca_lock
);
2176 read_unlock_bh(&idev
->lock
);
2181 * Add multicast single-source filter to the interface list
2183 static int ip6_mc_add1_src(struct ifmcaddr6
*pmc
, int sfmode
,
2184 const struct in6_addr
*psfsrc
)
2186 struct ip6_sf_list
*psf
, *psf_prev
;
2189 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
) {
2190 if (ipv6_addr_equal(&psf
->sf_addr
, psfsrc
))
2195 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
2199 psf
->sf_addr
= *psfsrc
;
2201 psf_prev
->sf_next
= psf
;
2203 pmc
->mca_sources
= psf
;
2205 psf
->sf_count
[sfmode
]++;
2209 static void sf_markstate(struct ifmcaddr6
*pmc
)
2211 struct ip6_sf_list
*psf
;
2212 int mca_xcount
= pmc
->mca_sfcount
[MCAST_EXCLUDE
];
2214 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
)
2215 if (pmc
->mca_sfcount
[MCAST_EXCLUDE
]) {
2216 psf
->sf_oldin
= mca_xcount
==
2217 psf
->sf_count
[MCAST_EXCLUDE
] &&
2218 !psf
->sf_count
[MCAST_INCLUDE
];
2220 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
2223 static int sf_setstate(struct ifmcaddr6
*pmc
)
2225 struct ip6_sf_list
*psf
, *dpsf
;
2226 int mca_xcount
= pmc
->mca_sfcount
[MCAST_EXCLUDE
];
2227 int qrv
= pmc
->idev
->mc_qrv
;
2231 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
) {
2232 if (pmc
->mca_sfcount
[MCAST_EXCLUDE
]) {
2233 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
2234 !psf
->sf_count
[MCAST_INCLUDE
];
2236 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
2238 if (!psf
->sf_oldin
) {
2239 struct ip6_sf_list
*prev
= NULL
;
2241 for (dpsf
= pmc
->mca_tomb
; dpsf
;
2242 dpsf
= dpsf
->sf_next
) {
2243 if (ipv6_addr_equal(&dpsf
->sf_addr
,
2250 prev
->sf_next
= dpsf
->sf_next
;
2252 pmc
->mca_tomb
= dpsf
->sf_next
;
2255 psf
->sf_crcount
= qrv
;
2258 } else if (psf
->sf_oldin
) {
2259 psf
->sf_crcount
= 0;
2261 * add or update "delete" records if an active filter
2264 for (dpsf
= pmc
->mca_tomb
; dpsf
; dpsf
= dpsf
->sf_next
)
2265 if (ipv6_addr_equal(&dpsf
->sf_addr
,
2269 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
2273 /* pmc->mca_lock held by callers */
2274 dpsf
->sf_next
= pmc
->mca_tomb
;
2275 pmc
->mca_tomb
= dpsf
;
2277 dpsf
->sf_crcount
= qrv
;
2285 * Add multicast source filter list to the interface list
2287 static int ip6_mc_add_src(struct inet6_dev
*idev
, const struct in6_addr
*pmca
,
2288 int sfmode
, int sfcount
, const struct in6_addr
*psfsrc
,
2291 struct ifmcaddr6
*pmc
;
2297 read_lock_bh(&idev
->lock
);
2298 for (pmc
= idev
->mc_list
; pmc
; pmc
= pmc
->next
) {
2299 if (ipv6_addr_equal(pmca
, &pmc
->mca_addr
))
2303 /* MCA not found?? bug */
2304 read_unlock_bh(&idev
->lock
);
2307 spin_lock_bh(&pmc
->mca_lock
);
2310 isexclude
= pmc
->mca_sfmode
== MCAST_EXCLUDE
;
2312 pmc
->mca_sfcount
[sfmode
]++;
2314 for (i
= 0; i
< sfcount
; i
++) {
2315 err
= ip6_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
]);
2323 pmc
->mca_sfcount
[sfmode
]--;
2324 for (j
= 0; j
< i
; j
++)
2325 ip6_mc_del1_src(pmc
, sfmode
, &psfsrc
[j
]);
2326 } else if (isexclude
!= (pmc
->mca_sfcount
[MCAST_EXCLUDE
] != 0)) {
2327 struct ip6_sf_list
*psf
;
2329 /* filter mode change */
2330 if (pmc
->mca_sfcount
[MCAST_EXCLUDE
])
2331 pmc
->mca_sfmode
= MCAST_EXCLUDE
;
2332 else if (pmc
->mca_sfcount
[MCAST_INCLUDE
])
2333 pmc
->mca_sfmode
= MCAST_INCLUDE
;
2334 /* else no filters; keep old mode for reports */
2336 pmc
->mca_crcount
= idev
->mc_qrv
;
2337 idev
->mc_ifc_count
= pmc
->mca_crcount
;
2338 for (psf
= pmc
->mca_sources
; psf
; psf
= psf
->sf_next
)
2339 psf
->sf_crcount
= 0;
2340 mld_ifc_event(idev
);
2341 } else if (sf_setstate(pmc
))
2342 mld_ifc_event(idev
);
2343 spin_unlock_bh(&pmc
->mca_lock
);
2344 read_unlock_bh(&idev
->lock
);
2348 static void ip6_mc_clear_src(struct ifmcaddr6
*pmc
)
2350 struct ip6_sf_list
*psf
, *nextpsf
;
2352 for (psf
= pmc
->mca_tomb
; psf
; psf
= nextpsf
) {
2353 nextpsf
= psf
->sf_next
;
2356 pmc
->mca_tomb
= NULL
;
2357 for (psf
= pmc
->mca_sources
; psf
; psf
= nextpsf
) {
2358 nextpsf
= psf
->sf_next
;
2361 pmc
->mca_sources
= NULL
;
2362 pmc
->mca_sfmode
= MCAST_EXCLUDE
;
2363 pmc
->mca_sfcount
[MCAST_INCLUDE
] = 0;
2364 pmc
->mca_sfcount
[MCAST_EXCLUDE
] = 1;
2368 static void igmp6_join_group(struct ifmcaddr6
*ma
)
2370 unsigned long delay
;
2372 if (ma
->mca_flags
& MAF_NOREPORT
)
2375 igmp6_send(&ma
->mca_addr
, ma
->idev
->dev
, ICMPV6_MGM_REPORT
);
2377 delay
= prandom_u32() % unsolicited_report_interval(ma
->idev
);
2379 spin_lock_bh(&ma
->mca_lock
);
2380 if (del_timer(&ma
->mca_timer
)) {
2381 atomic_dec(&ma
->mca_refcnt
);
2382 delay
= ma
->mca_timer
.expires
- jiffies
;
2385 if (!mod_timer(&ma
->mca_timer
, jiffies
+ delay
))
2386 atomic_inc(&ma
->mca_refcnt
);
2387 ma
->mca_flags
|= MAF_TIMER_RUNNING
| MAF_LAST_REPORTER
;
2388 spin_unlock_bh(&ma
->mca_lock
);
2391 static int ip6_mc_leave_src(struct sock
*sk
, struct ipv6_mc_socklist
*iml
,
2392 struct inet6_dev
*idev
)
2396 /* callers have the socket lock and rtnl lock
2397 * so no other readers or writers of iml or its sflist
2400 /* any-source empty exclude case */
2401 return ip6_mc_del_src(idev
, &iml
->addr
, iml
->sfmode
, 0, NULL
, 0);
2403 err
= ip6_mc_del_src(idev
, &iml
->addr
, iml
->sfmode
,
2404 iml
->sflist
->sl_count
, iml
->sflist
->sl_addr
, 0);
2405 sock_kfree_s(sk
, iml
->sflist
, IP6_SFLSIZE(iml
->sflist
->sl_max
));
2410 static void igmp6_leave_group(struct ifmcaddr6
*ma
)
2412 if (mld_in_v1_mode(ma
->idev
)) {
2413 if (ma
->mca_flags
& MAF_LAST_REPORTER
)
2414 igmp6_send(&ma
->mca_addr
, ma
->idev
->dev
,
2415 ICMPV6_MGM_REDUCTION
);
2417 mld_add_delrec(ma
->idev
, ma
);
2418 mld_ifc_event(ma
->idev
);
2422 static void mld_gq_timer_expire(unsigned long data
)
2424 struct inet6_dev
*idev
= (struct inet6_dev
*)data
;
2426 idev
->mc_gq_running
= 0;
2427 mld_send_report(idev
, NULL
);
2431 static void mld_ifc_timer_expire(unsigned long data
)
2433 struct inet6_dev
*idev
= (struct inet6_dev
*)data
;
2436 if (idev
->mc_ifc_count
) {
2437 idev
->mc_ifc_count
--;
2438 if (idev
->mc_ifc_count
)
2439 mld_ifc_start_timer(idev
, idev
->mc_maxdelay
);
2444 static void mld_ifc_event(struct inet6_dev
*idev
)
2446 if (mld_in_v1_mode(idev
))
2448 idev
->mc_ifc_count
= idev
->mc_qrv
;
2449 mld_ifc_start_timer(idev
, 1);
2453 static void igmp6_timer_handler(unsigned long data
)
2455 struct ifmcaddr6
*ma
= (struct ifmcaddr6
*) data
;
2457 if (mld_in_v1_mode(ma
->idev
))
2458 igmp6_send(&ma
->mca_addr
, ma
->idev
->dev
, ICMPV6_MGM_REPORT
);
2460 mld_send_report(ma
->idev
, ma
);
2462 spin_lock(&ma
->mca_lock
);
2463 ma
->mca_flags
|= MAF_LAST_REPORTER
;
2464 ma
->mca_flags
&= ~MAF_TIMER_RUNNING
;
2465 spin_unlock(&ma
->mca_lock
);
2469 /* Device changing type */
2471 void ipv6_mc_unmap(struct inet6_dev
*idev
)
2473 struct ifmcaddr6
*i
;
2475 /* Install multicast list, except for all-nodes (already installed) */
2477 read_lock_bh(&idev
->lock
);
2478 for (i
= idev
->mc_list
; i
; i
= i
->next
)
2479 igmp6_group_dropped(i
);
2480 read_unlock_bh(&idev
->lock
);
2483 void ipv6_mc_remap(struct inet6_dev
*idev
)
2488 /* Device going down */
2490 void ipv6_mc_down(struct inet6_dev
*idev
)
2492 struct ifmcaddr6
*i
;
2494 /* Withdraw multicast list */
2496 read_lock_bh(&idev
->lock
);
2497 mld_ifc_stop_timer(idev
);
2498 mld_gq_stop_timer(idev
);
2499 mld_dad_stop_timer(idev
);
2501 for (i
= idev
->mc_list
; i
; i
= i
->next
)
2502 igmp6_group_dropped(i
);
2503 read_unlock_bh(&idev
->lock
);
2505 mld_clear_delrec(idev
);
2508 static void ipv6_mc_reset(struct inet6_dev
*idev
)
2510 idev
->mc_qrv
= sysctl_mld_qrv
;
2511 idev
->mc_qi
= MLD_QI_DEFAULT
;
2512 idev
->mc_qri
= MLD_QRI_DEFAULT
;
2513 idev
->mc_v1_seen
= 0;
2514 idev
->mc_maxdelay
= unsolicited_report_interval(idev
);
2517 /* Device going up */
2519 void ipv6_mc_up(struct inet6_dev
*idev
)
2521 struct ifmcaddr6
*i
;
2523 /* Install multicast list, except for all-nodes (already installed) */
2525 read_lock_bh(&idev
->lock
);
2526 ipv6_mc_reset(idev
);
2527 for (i
= idev
->mc_list
; i
; i
= i
->next
)
2528 igmp6_group_added(i
);
2529 read_unlock_bh(&idev
->lock
);
2532 /* IPv6 device initialization. */
2534 void ipv6_mc_init_dev(struct inet6_dev
*idev
)
2536 write_lock_bh(&idev
->lock
);
2537 spin_lock_init(&idev
->mc_lock
);
2538 idev
->mc_gq_running
= 0;
2539 setup_timer(&idev
->mc_gq_timer
, mld_gq_timer_expire
,
2540 (unsigned long)idev
);
2541 idev
->mc_tomb
= NULL
;
2542 idev
->mc_ifc_count
= 0;
2543 setup_timer(&idev
->mc_ifc_timer
, mld_ifc_timer_expire
,
2544 (unsigned long)idev
);
2545 setup_timer(&idev
->mc_dad_timer
, mld_dad_timer_expire
,
2546 (unsigned long)idev
);
2547 ipv6_mc_reset(idev
);
2548 write_unlock_bh(&idev
->lock
);
2552 * Device is about to be destroyed: clean up.
2555 void ipv6_mc_destroy_dev(struct inet6_dev
*idev
)
2557 struct ifmcaddr6
*i
;
2559 /* Deactivate timers */
2562 /* Delete all-nodes address. */
2563 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2564 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2567 __ipv6_dev_mc_dec(idev
, &in6addr_linklocal_allnodes
);
2569 if (idev
->cnf
.forwarding
)
2570 __ipv6_dev_mc_dec(idev
, &in6addr_linklocal_allrouters
);
2572 write_lock_bh(&idev
->lock
);
2573 while ((i
= idev
->mc_list
) != NULL
) {
2574 idev
->mc_list
= i
->next
;
2575 write_unlock_bh(&idev
->lock
);
2577 igmp6_group_dropped(i
);
2580 write_lock_bh(&idev
->lock
);
2582 write_unlock_bh(&idev
->lock
);
2585 #ifdef CONFIG_PROC_FS
2586 struct igmp6_mc_iter_state
{
2587 struct seq_net_private p
;
2588 struct net_device
*dev
;
2589 struct inet6_dev
*idev
;
2592 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2594 static inline struct ifmcaddr6
*igmp6_mc_get_first(struct seq_file
*seq
)
2596 struct ifmcaddr6
*im
= NULL
;
2597 struct igmp6_mc_iter_state
*state
= igmp6_mc_seq_private(seq
);
2598 struct net
*net
= seq_file_net(seq
);
2601 for_each_netdev_rcu(net
, state
->dev
) {
2602 struct inet6_dev
*idev
;
2603 idev
= __in6_dev_get(state
->dev
);
2606 read_lock_bh(&idev
->lock
);
2612 read_unlock_bh(&idev
->lock
);
2617 static struct ifmcaddr6
*igmp6_mc_get_next(struct seq_file
*seq
, struct ifmcaddr6
*im
)
2619 struct igmp6_mc_iter_state
*state
= igmp6_mc_seq_private(seq
);
2623 if (likely(state
->idev
))
2624 read_unlock_bh(&state
->idev
->lock
);
2626 state
->dev
= next_net_device_rcu(state
->dev
);
2631 state
->idev
= __in6_dev_get(state
->dev
);
2634 read_lock_bh(&state
->idev
->lock
);
2635 im
= state
->idev
->mc_list
;
2640 static struct ifmcaddr6
*igmp6_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2642 struct ifmcaddr6
*im
= igmp6_mc_get_first(seq
);
2644 while (pos
&& (im
= igmp6_mc_get_next(seq
, im
)) != NULL
)
2646 return pos
? NULL
: im
;
2649 static void *igmp6_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2653 return igmp6_mc_get_idx(seq
, *pos
);
2656 static void *igmp6_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2658 struct ifmcaddr6
*im
= igmp6_mc_get_next(seq
, v
);
2664 static void igmp6_mc_seq_stop(struct seq_file
*seq
, void *v
)
2667 struct igmp6_mc_iter_state
*state
= igmp6_mc_seq_private(seq
);
2669 if (likely(state
->idev
)) {
2670 read_unlock_bh(&state
->idev
->lock
);
2677 static int igmp6_mc_seq_show(struct seq_file
*seq
, void *v
)
2679 struct ifmcaddr6
*im
= (struct ifmcaddr6
*)v
;
2680 struct igmp6_mc_iter_state
*state
= igmp6_mc_seq_private(seq
);
2683 "%-4d %-15s %pi6 %5d %08X %ld\n",
2684 state
->dev
->ifindex
, state
->dev
->name
,
2686 im
->mca_users
, im
->mca_flags
,
2687 (im
->mca_flags
&MAF_TIMER_RUNNING
) ?
2688 jiffies_to_clock_t(im
->mca_timer
.expires
-jiffies
) : 0);
2692 static const struct seq_operations igmp6_mc_seq_ops
= {
2693 .start
= igmp6_mc_seq_start
,
2694 .next
= igmp6_mc_seq_next
,
2695 .stop
= igmp6_mc_seq_stop
,
2696 .show
= igmp6_mc_seq_show
,
2699 static int igmp6_mc_seq_open(struct inode
*inode
, struct file
*file
)
2701 return seq_open_net(inode
, file
, &igmp6_mc_seq_ops
,
2702 sizeof(struct igmp6_mc_iter_state
));
2705 static const struct file_operations igmp6_mc_seq_fops
= {
2706 .owner
= THIS_MODULE
,
2707 .open
= igmp6_mc_seq_open
,
2709 .llseek
= seq_lseek
,
2710 .release
= seq_release_net
,
2713 struct igmp6_mcf_iter_state
{
2714 struct seq_net_private p
;
2715 struct net_device
*dev
;
2716 struct inet6_dev
*idev
;
2717 struct ifmcaddr6
*im
;
2720 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2722 static inline struct ip6_sf_list
*igmp6_mcf_get_first(struct seq_file
*seq
)
2724 struct ip6_sf_list
*psf
= NULL
;
2725 struct ifmcaddr6
*im
= NULL
;
2726 struct igmp6_mcf_iter_state
*state
= igmp6_mcf_seq_private(seq
);
2727 struct net
*net
= seq_file_net(seq
);
2731 for_each_netdev_rcu(net
, state
->dev
) {
2732 struct inet6_dev
*idev
;
2733 idev
= __in6_dev_get(state
->dev
);
2734 if (unlikely(idev
== NULL
))
2736 read_lock_bh(&idev
->lock
);
2739 spin_lock_bh(&im
->mca_lock
);
2740 psf
= im
->mca_sources
;
2746 spin_unlock_bh(&im
->mca_lock
);
2748 read_unlock_bh(&idev
->lock
);
2753 static struct ip6_sf_list
*igmp6_mcf_get_next(struct seq_file
*seq
, struct ip6_sf_list
*psf
)
2755 struct igmp6_mcf_iter_state
*state
= igmp6_mcf_seq_private(seq
);
2759 spin_unlock_bh(&state
->im
->mca_lock
);
2760 state
->im
= state
->im
->next
;
2761 while (!state
->im
) {
2762 if (likely(state
->idev
))
2763 read_unlock_bh(&state
->idev
->lock
);
2765 state
->dev
= next_net_device_rcu(state
->dev
);
2770 state
->idev
= __in6_dev_get(state
->dev
);
2773 read_lock_bh(&state
->idev
->lock
);
2774 state
->im
= state
->idev
->mc_list
;
2778 spin_lock_bh(&state
->im
->mca_lock
);
2779 psf
= state
->im
->mca_sources
;
2785 static struct ip6_sf_list
*igmp6_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2787 struct ip6_sf_list
*psf
= igmp6_mcf_get_first(seq
);
2789 while (pos
&& (psf
= igmp6_mcf_get_next(seq
, psf
)) != NULL
)
2791 return pos
? NULL
: psf
;
2794 static void *igmp6_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2798 return *pos
? igmp6_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2801 static void *igmp6_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2803 struct ip6_sf_list
*psf
;
2804 if (v
== SEQ_START_TOKEN
)
2805 psf
= igmp6_mcf_get_first(seq
);
2807 psf
= igmp6_mcf_get_next(seq
, v
);
2812 static void igmp6_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2815 struct igmp6_mcf_iter_state
*state
= igmp6_mcf_seq_private(seq
);
2816 if (likely(state
->im
)) {
2817 spin_unlock_bh(&state
->im
->mca_lock
);
2820 if (likely(state
->idev
)) {
2821 read_unlock_bh(&state
->idev
->lock
);
2828 static int igmp6_mcf_seq_show(struct seq_file
*seq
, void *v
)
2830 struct ip6_sf_list
*psf
= (struct ip6_sf_list
*)v
;
2831 struct igmp6_mcf_iter_state
*state
= igmp6_mcf_seq_private(seq
);
2833 if (v
== SEQ_START_TOKEN
) {
2834 seq_puts(seq
, "Idx Device Multicast Address Source Address INC EXC\n");
2837 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2838 state
->dev
->ifindex
, state
->dev
->name
,
2839 &state
->im
->mca_addr
,
2841 psf
->sf_count
[MCAST_INCLUDE
],
2842 psf
->sf_count
[MCAST_EXCLUDE
]);
2847 static const struct seq_operations igmp6_mcf_seq_ops
= {
2848 .start
= igmp6_mcf_seq_start
,
2849 .next
= igmp6_mcf_seq_next
,
2850 .stop
= igmp6_mcf_seq_stop
,
2851 .show
= igmp6_mcf_seq_show
,
2854 static int igmp6_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2856 return seq_open_net(inode
, file
, &igmp6_mcf_seq_ops
,
2857 sizeof(struct igmp6_mcf_iter_state
));
2860 static const struct file_operations igmp6_mcf_seq_fops
= {
2861 .owner
= THIS_MODULE
,
2862 .open
= igmp6_mcf_seq_open
,
2864 .llseek
= seq_lseek
,
2865 .release
= seq_release_net
,
2868 static int __net_init
igmp6_proc_init(struct net
*net
)
2873 if (!proc_create("igmp6", S_IRUGO
, net
->proc_net
, &igmp6_mc_seq_fops
))
2875 if (!proc_create("mcfilter6", S_IRUGO
, net
->proc_net
,
2876 &igmp6_mcf_seq_fops
))
2877 goto out_proc_net_igmp6
;
2884 remove_proc_entry("igmp6", net
->proc_net
);
2888 static void __net_exit
igmp6_proc_exit(struct net
*net
)
2890 remove_proc_entry("mcfilter6", net
->proc_net
);
2891 remove_proc_entry("igmp6", net
->proc_net
);
2894 static inline int igmp6_proc_init(struct net
*net
)
2898 static inline void igmp6_proc_exit(struct net
*net
)
2903 static int __net_init
igmp6_net_init(struct net
*net
)
2907 err
= inet_ctl_sock_create(&net
->ipv6
.igmp_sk
, PF_INET6
,
2908 SOCK_RAW
, IPPROTO_ICMPV6
, net
);
2910 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2915 inet6_sk(net
->ipv6
.igmp_sk
)->hop_limit
= 1;
2917 err
= inet_ctl_sock_create(&net
->ipv6
.mc_autojoin_sk
, PF_INET6
,
2918 SOCK_RAW
, IPPROTO_ICMPV6
, net
);
2920 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2922 goto out_sock_create
;
2925 err
= igmp6_proc_init(net
);
2927 goto out_sock_create_autojoin
;
2931 out_sock_create_autojoin
:
2932 inet_ctl_sock_destroy(net
->ipv6
.mc_autojoin_sk
);
2934 inet_ctl_sock_destroy(net
->ipv6
.igmp_sk
);
2939 static void __net_exit
igmp6_net_exit(struct net
*net
)
2941 inet_ctl_sock_destroy(net
->ipv6
.igmp_sk
);
2942 inet_ctl_sock_destroy(net
->ipv6
.mc_autojoin_sk
);
2943 igmp6_proc_exit(net
);
2946 static struct pernet_operations igmp6_net_ops
= {
2947 .init
= igmp6_net_init
,
2948 .exit
= igmp6_net_exit
,
2951 int __init
igmp6_init(void)
2953 return register_pernet_subsys(&igmp6_net_ops
);
2956 void igmp6_cleanup(void)
2958 unregister_pernet_subsys(&igmp6_net_ops
);