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 int __mld2_query_bugs[] __attribute__((__unused__)) = {
69 BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
70 BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
71 BUILD_BUG_ON_ZERO(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(struct timer_list *t);
80 static void mld_gq_timer_expire(struct timer_list *t);
81 static void mld_ifc_timer_expire(struct timer_list *t);
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, struct ifmcaddr6 *pmc);
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);
98 static int __ipv6_dev_mc_inc(struct net_device *dev,
99 const struct in6_addr *addr, unsigned int mode);
101 #define MLD_QRV_DEFAULT 2
102 /* RFC3810, 9.2. Query Interval */
103 #define MLD_QI_DEFAULT (125 * HZ)
104 /* RFC3810, 9.3. Query Response Interval */
105 #define MLD_QRI_DEFAULT (10 * HZ)
107 /* RFC3810, 8.1 Query Version Distinctions */
108 #define MLD_V1_QUERY_LEN 24
109 #define MLD_V2_QUERY_LEN_MIN 28
111 #define IPV6_MLD_MAX_MSF 64
113 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
114 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
117 * socket join on multicast group
120 #define for_each_pmc_rcu(np, pmc) \
121 for (pmc = rcu_dereference(np->ipv6_mc_list); \
123 pmc = rcu_dereference(pmc->next))
125 static int unsolicited_report_interval(struct inet6_dev *idev)
129 if (mld_in_v1_mode(idev))
130 iv = idev->cnf.mldv1_unsolicited_report_interval;
132 iv = idev->cnf.mldv2_unsolicited_report_interval;
134 return iv > 0 ? iv : 1;
137 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
138 const struct in6_addr *addr, unsigned int mode)
140 struct net_device *dev = NULL;
141 struct ipv6_mc_socklist *mc_lst;
142 struct ipv6_pinfo *np = inet6_sk(sk);
143 struct net *net = sock_net(sk);
148 if (!ipv6_addr_is_multicast(addr))
152 for_each_pmc_rcu(np, mc_lst) {
153 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
154 ipv6_addr_equal(&mc_lst->addr, addr)) {
161 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
167 mc_lst->addr = *addr;
171 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
177 dev = __dev_get_by_index(net, ifindex);
180 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
184 mc_lst->ifindex = dev->ifindex;
185 mc_lst->sfmode = mode;
186 rwlock_init(&mc_lst->sflock);
187 mc_lst->sflist = NULL;
190 * now add/increase the group membership on the device
193 err = __ipv6_dev_mc_inc(dev, addr, mode);
196 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
200 mc_lst->next = np->ipv6_mc_list;
201 rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
206 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
208 return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
210 EXPORT_SYMBOL(ipv6_sock_mc_join);
212 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
213 const struct in6_addr *addr, unsigned int mode)
215 return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
219 * socket leave on multicast group
221 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
223 struct ipv6_pinfo *np = inet6_sk(sk);
224 struct ipv6_mc_socklist *mc_lst;
225 struct ipv6_mc_socklist __rcu **lnk;
226 struct net *net = sock_net(sk);
230 if (!ipv6_addr_is_multicast(addr))
233 for (lnk = &np->ipv6_mc_list;
234 (mc_lst = rtnl_dereference(*lnk)) != NULL;
235 lnk = &mc_lst->next) {
236 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
237 ipv6_addr_equal(&mc_lst->addr, addr)) {
238 struct net_device *dev;
242 dev = __dev_get_by_index(net, mc_lst->ifindex);
244 struct inet6_dev *idev = __in6_dev_get(dev);
246 (void) ip6_mc_leave_src(sk, mc_lst, idev);
248 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
250 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
252 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
253 kfree_rcu(mc_lst, rcu);
258 return -EADDRNOTAVAIL;
260 EXPORT_SYMBOL(ipv6_sock_mc_drop);
262 /* called with rcu_read_lock() */
263 static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
264 const struct in6_addr *group,
267 struct net_device *dev = NULL;
268 struct inet6_dev *idev = NULL;
271 struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
278 dev = dev_get_by_index_rcu(net, ifindex);
282 idev = __in6_dev_get(dev);
285 read_lock_bh(&idev->lock);
287 read_unlock_bh(&idev->lock);
293 void __ipv6_sock_mc_close(struct sock *sk)
295 struct ipv6_pinfo *np = inet6_sk(sk);
296 struct ipv6_mc_socklist *mc_lst;
297 struct net *net = sock_net(sk);
301 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
302 struct net_device *dev;
304 np->ipv6_mc_list = mc_lst->next;
306 dev = __dev_get_by_index(net, mc_lst->ifindex);
308 struct inet6_dev *idev = __in6_dev_get(dev);
310 (void) ip6_mc_leave_src(sk, mc_lst, idev);
312 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
314 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
316 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
317 kfree_rcu(mc_lst, rcu);
321 void ipv6_sock_mc_close(struct sock *sk)
323 struct ipv6_pinfo *np = inet6_sk(sk);
325 if (!rcu_access_pointer(np->ipv6_mc_list))
328 __ipv6_sock_mc_close(sk);
332 int ip6_mc_source(int add, int omode, struct sock *sk,
333 struct group_source_req *pgsr)
335 struct in6_addr *source, *group;
336 struct ipv6_mc_socklist *pmc;
337 struct inet6_dev *idev;
338 struct ipv6_pinfo *inet6 = inet6_sk(sk);
339 struct ip6_sf_socklist *psl;
340 struct net *net = sock_net(sk);
346 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
347 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
349 if (!ipv6_addr_is_multicast(group))
353 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
359 err = -EADDRNOTAVAIL;
361 for_each_pmc_rcu(inet6, pmc) {
362 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
364 if (ipv6_addr_equal(&pmc->addr, group))
367 if (!pmc) { /* must have a prior join */
371 /* if a source filter was set, must be the same mode as before */
373 if (pmc->sfmode != omode) {
377 } else if (pmc->sfmode != omode) {
378 /* allow mode switches for empty-set filters */
379 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
380 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
384 write_lock(&pmc->sflock);
390 goto done; /* err = -EADDRNOTAVAIL */
392 for (i = 0; i < psl->sl_count; i++) {
393 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
397 if (rv) /* source not found */
398 goto done; /* err = -EADDRNOTAVAIL */
400 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
401 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
406 /* update the interface filter */
407 ip6_mc_del_src(idev, group, omode, 1, source, 1);
409 for (j = i+1; j < psl->sl_count; j++)
410 psl->sl_addr[j-1] = psl->sl_addr[j];
415 /* else, add a new source to the filter */
417 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
421 if (!psl || psl->sl_count == psl->sl_max) {
422 struct ip6_sf_socklist *newpsl;
423 int count = IP6_SFBLOCK;
426 count += psl->sl_max;
427 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
432 newpsl->sl_max = count;
433 newpsl->sl_count = count - IP6_SFBLOCK;
435 for (i = 0; i < psl->sl_count; i++)
436 newpsl->sl_addr[i] = psl->sl_addr[i];
437 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
439 pmc->sflist = psl = newpsl;
441 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
442 for (i = 0; i < psl->sl_count; i++) {
443 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
444 if (rv == 0) /* There is an error in the address. */
447 for (j = psl->sl_count-1; j >= i; j--)
448 psl->sl_addr[j+1] = psl->sl_addr[j];
449 psl->sl_addr[i] = *source;
452 /* update the interface list */
453 ip6_mc_add_src(idev, group, omode, 1, source, 1);
456 write_unlock(&pmc->sflock);
457 read_unlock_bh(&idev->lock);
460 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
464 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
466 const struct in6_addr *group;
467 struct ipv6_mc_socklist *pmc;
468 struct inet6_dev *idev;
469 struct ipv6_pinfo *inet6 = inet6_sk(sk);
470 struct ip6_sf_socklist *newpsl, *psl;
471 struct net *net = sock_net(sk);
475 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
477 if (!ipv6_addr_is_multicast(group))
479 if (gsf->gf_fmode != MCAST_INCLUDE &&
480 gsf->gf_fmode != MCAST_EXCLUDE)
484 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
493 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
498 for_each_pmc_rcu(inet6, pmc) {
499 if (pmc->ifindex != gsf->gf_interface)
501 if (ipv6_addr_equal(&pmc->addr, group))
504 if (!pmc) { /* must have a prior join */
508 if (gsf->gf_numsrc) {
509 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
515 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
516 for (i = 0; i < newpsl->sl_count; ++i) {
517 struct sockaddr_in6 *psin6;
519 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
520 newpsl->sl_addr[i] = psin6->sin6_addr;
522 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
523 newpsl->sl_count, newpsl->sl_addr, 0);
525 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
530 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
533 write_lock(&pmc->sflock);
536 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
537 psl->sl_count, psl->sl_addr, 0);
538 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
540 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
541 pmc->sflist = newpsl;
542 pmc->sfmode = gsf->gf_fmode;
543 write_unlock(&pmc->sflock);
546 read_unlock_bh(&idev->lock);
549 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
553 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
554 struct group_filter __user *optval, int __user *optlen)
556 int err, i, count, copycount;
557 const struct in6_addr *group;
558 struct ipv6_mc_socklist *pmc;
559 struct inet6_dev *idev;
560 struct ipv6_pinfo *inet6 = inet6_sk(sk);
561 struct ip6_sf_socklist *psl;
562 struct net *net = sock_net(sk);
564 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
566 if (!ipv6_addr_is_multicast(group))
570 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
577 err = -EADDRNOTAVAIL;
578 /* changes to the ipv6_mc_list require the socket lock and
579 * rtnl lock. We have the socket lock and rcu read lock,
580 * so reading the list is safe.
583 for_each_pmc_rcu(inet6, pmc) {
584 if (pmc->ifindex != gsf->gf_interface)
586 if (ipv6_addr_equal(group, &pmc->addr))
589 if (!pmc) /* must have a prior join */
591 gsf->gf_fmode = pmc->sfmode;
593 count = psl ? psl->sl_count : 0;
594 read_unlock_bh(&idev->lock);
597 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
598 gsf->gf_numsrc = count;
599 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
600 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
603 /* changes to psl require the socket lock, and a write lock
604 * on pmc->sflock. We have the socket lock so reading here is safe.
606 for (i = 0; i < copycount; i++) {
607 struct sockaddr_in6 *psin6;
608 struct sockaddr_storage ss;
610 psin6 = (struct sockaddr_in6 *)&ss;
611 memset(&ss, 0, sizeof(ss));
612 psin6->sin6_family = AF_INET6;
613 psin6->sin6_addr = psl->sl_addr[i];
614 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
619 read_unlock_bh(&idev->lock);
624 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
625 const struct in6_addr *src_addr)
627 struct ipv6_pinfo *np = inet6_sk(sk);
628 struct ipv6_mc_socklist *mc;
629 struct ip6_sf_socklist *psl;
633 for_each_pmc_rcu(np, mc) {
634 if (ipv6_addr_equal(&mc->addr, mc_addr))
641 read_lock(&mc->sflock);
644 rv = mc->sfmode == MCAST_EXCLUDE;
648 for (i = 0; i < psl->sl_count; i++) {
649 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
652 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
654 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
657 read_unlock(&mc->sflock);
663 static void igmp6_group_added(struct ifmcaddr6 *mc)
665 struct net_device *dev = mc->idev->dev;
666 char buf[MAX_ADDR_LEN];
668 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
669 IPV6_ADDR_SCOPE_LINKLOCAL)
672 spin_lock_bh(&mc->mca_lock);
673 if (!(mc->mca_flags&MAF_LOADED)) {
674 mc->mca_flags |= MAF_LOADED;
675 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
676 dev_mc_add(dev, buf);
678 spin_unlock_bh(&mc->mca_lock);
680 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
683 if (mld_in_v1_mode(mc->idev)) {
684 igmp6_join_group(mc);
689 /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
690 * should not send filter-mode change record as the mode
691 * should be from IN() to IN(A).
693 if (mc->mca_sfmode == MCAST_EXCLUDE)
694 mc->mca_crcount = mc->idev->mc_qrv;
696 mld_ifc_event(mc->idev);
699 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
701 struct net_device *dev = mc->idev->dev;
702 char buf[MAX_ADDR_LEN];
704 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
705 IPV6_ADDR_SCOPE_LINKLOCAL)
708 spin_lock_bh(&mc->mca_lock);
709 if (mc->mca_flags&MAF_LOADED) {
710 mc->mca_flags &= ~MAF_LOADED;
711 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
712 dev_mc_del(dev, buf);
715 spin_unlock_bh(&mc->mca_lock);
716 if (mc->mca_flags & MAF_NOREPORT)
720 igmp6_leave_group(mc);
722 spin_lock_bh(&mc->mca_lock);
723 if (del_timer(&mc->mca_timer))
724 refcount_dec(&mc->mca_refcnt);
725 spin_unlock_bh(&mc->mca_lock);
729 * deleted ifmcaddr6 manipulation
731 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
733 struct ifmcaddr6 *pmc;
735 /* this is an "ifmcaddr6" for convenience; only the fields below
736 * are actually used. In particular, the refcnt and users are not
737 * used for management of the delete list. Using the same structure
738 * for deleted items allows change reports to use common code with
739 * non-deleted or query-response MCA's.
741 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
745 spin_lock_bh(&im->mca_lock);
746 spin_lock_init(&pmc->mca_lock);
747 pmc->idev = im->idev;
749 pmc->mca_addr = im->mca_addr;
750 pmc->mca_crcount = idev->mc_qrv;
751 pmc->mca_sfmode = im->mca_sfmode;
752 if (pmc->mca_sfmode == MCAST_INCLUDE) {
753 struct ip6_sf_list *psf;
755 pmc->mca_tomb = im->mca_tomb;
756 pmc->mca_sources = im->mca_sources;
757 im->mca_tomb = im->mca_sources = NULL;
758 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
759 psf->sf_crcount = pmc->mca_crcount;
761 spin_unlock_bh(&im->mca_lock);
763 spin_lock_bh(&idev->mc_lock);
764 pmc->next = idev->mc_tomb;
766 spin_unlock_bh(&idev->mc_lock);
769 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
771 struct ifmcaddr6 *pmc, *pmc_prev;
772 struct ip6_sf_list *psf;
773 struct in6_addr *pmca = &im->mca_addr;
775 spin_lock_bh(&idev->mc_lock);
777 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
778 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
784 pmc_prev->next = pmc->next;
786 idev->mc_tomb = pmc->next;
788 spin_unlock_bh(&idev->mc_lock);
790 spin_lock_bh(&im->mca_lock);
792 im->idev = pmc->idev;
793 if (im->mca_sfmode == MCAST_INCLUDE) {
794 swap(im->mca_tomb, pmc->mca_tomb);
795 swap(im->mca_sources, pmc->mca_sources);
796 for (psf = im->mca_sources; psf; psf = psf->sf_next)
797 psf->sf_crcount = idev->mc_qrv;
799 im->mca_crcount = idev->mc_qrv;
801 in6_dev_put(pmc->idev);
802 ip6_mc_clear_src(pmc);
805 spin_unlock_bh(&im->mca_lock);
808 static void mld_clear_delrec(struct inet6_dev *idev)
810 struct ifmcaddr6 *pmc, *nextpmc;
812 spin_lock_bh(&idev->mc_lock);
814 idev->mc_tomb = NULL;
815 spin_unlock_bh(&idev->mc_lock);
817 for (; pmc; pmc = nextpmc) {
819 ip6_mc_clear_src(pmc);
820 in6_dev_put(pmc->idev);
824 /* clear dead sources, too */
825 read_lock_bh(&idev->lock);
826 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
827 struct ip6_sf_list *psf, *psf_next;
829 spin_lock_bh(&pmc->mca_lock);
831 pmc->mca_tomb = NULL;
832 spin_unlock_bh(&pmc->mca_lock);
833 for (; psf; psf = psf_next) {
834 psf_next = psf->sf_next;
838 read_unlock_bh(&idev->lock);
841 static void mca_get(struct ifmcaddr6 *mc)
843 refcount_inc(&mc->mca_refcnt);
846 static void ma_put(struct ifmcaddr6 *mc)
848 if (refcount_dec_and_test(&mc->mca_refcnt)) {
849 in6_dev_put(mc->idev);
854 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
855 const struct in6_addr *addr,
858 struct ifmcaddr6 *mc;
860 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
864 timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
866 mc->mca_addr = *addr;
867 mc->idev = idev; /* reference taken by caller */
869 /* mca_stamp should be updated upon changes */
870 mc->mca_cstamp = mc->mca_tstamp = jiffies;
871 refcount_set(&mc->mca_refcnt, 1);
872 spin_lock_init(&mc->mca_lock);
874 mc->mca_sfmode = mode;
875 mc->mca_sfcount[mode] = 1;
877 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
878 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
879 mc->mca_flags |= MAF_NOREPORT;
885 * device multicast group inc (add if not found)
887 static int __ipv6_dev_mc_inc(struct net_device *dev,
888 const struct in6_addr *addr, unsigned int mode)
890 struct ifmcaddr6 *mc;
891 struct inet6_dev *idev;
895 /* we need to take a reference on idev */
896 idev = in6_dev_get(dev);
901 write_lock_bh(&idev->lock);
903 write_unlock_bh(&idev->lock);
908 for (mc = idev->mc_list; mc; mc = mc->next) {
909 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
911 write_unlock_bh(&idev->lock);
912 ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
918 mc = mca_alloc(idev, addr, mode);
920 write_unlock_bh(&idev->lock);
925 mc->next = idev->mc_list;
928 /* Hold this for the code below before we unlock,
929 * it is already exposed via idev->mc_list.
932 write_unlock_bh(&idev->lock);
934 mld_del_delrec(idev, mc);
935 igmp6_group_added(mc);
940 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
942 return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
946 * device multicast group del
948 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
950 struct ifmcaddr6 *ma, **map;
954 write_lock_bh(&idev->lock);
955 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
956 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
957 if (--ma->mca_users == 0) {
959 write_unlock_bh(&idev->lock);
961 igmp6_group_dropped(ma);
962 ip6_mc_clear_src(ma);
967 write_unlock_bh(&idev->lock);
971 write_unlock_bh(&idev->lock);
976 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
978 struct inet6_dev *idev;
983 idev = __in6_dev_get(dev);
987 err = __ipv6_dev_mc_dec(idev, addr);
993 * check if the interface/address pair is valid
995 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
996 const struct in6_addr *src_addr)
998 struct inet6_dev *idev;
999 struct ifmcaddr6 *mc;
1003 idev = __in6_dev_get(dev);
1005 read_lock_bh(&idev->lock);
1006 for (mc = idev->mc_list; mc; mc = mc->next) {
1007 if (ipv6_addr_equal(&mc->mca_addr, group))
1011 if (src_addr && !ipv6_addr_any(src_addr)) {
1012 struct ip6_sf_list *psf;
1014 spin_lock_bh(&mc->mca_lock);
1015 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1016 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1020 rv = psf->sf_count[MCAST_INCLUDE] ||
1021 psf->sf_count[MCAST_EXCLUDE] !=
1022 mc->mca_sfcount[MCAST_EXCLUDE];
1024 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1025 spin_unlock_bh(&mc->mca_lock);
1027 rv = true; /* don't filter unspecified source */
1029 read_unlock_bh(&idev->lock);
1035 static void mld_gq_start_timer(struct inet6_dev *idev)
1037 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1039 idev->mc_gq_running = 1;
1040 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1044 static void mld_gq_stop_timer(struct inet6_dev *idev)
1046 idev->mc_gq_running = 0;
1047 if (del_timer(&idev->mc_gq_timer))
1048 __in6_dev_put(idev);
1051 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1053 unsigned long tv = prandom_u32() % delay;
1055 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1059 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1061 idev->mc_ifc_count = 0;
1062 if (del_timer(&idev->mc_ifc_timer))
1063 __in6_dev_put(idev);
1066 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1068 unsigned long tv = prandom_u32() % delay;
1070 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1074 static void mld_dad_stop_timer(struct inet6_dev *idev)
1076 if (del_timer(&idev->mc_dad_timer))
1077 __in6_dev_put(idev);
1081 * IGMP handling (alias multicast ICMPv6 messages)
1084 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1086 unsigned long delay = resptime;
1088 /* Do not start timer for these addresses */
1089 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1090 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1093 if (del_timer(&ma->mca_timer)) {
1094 refcount_dec(&ma->mca_refcnt);
1095 delay = ma->mca_timer.expires - jiffies;
1098 if (delay >= resptime)
1099 delay = prandom_u32() % resptime;
1101 ma->mca_timer.expires = jiffies + delay;
1102 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1103 refcount_inc(&ma->mca_refcnt);
1104 ma->mca_flags |= MAF_TIMER_RUNNING;
1107 /* mark EXCLUDE-mode sources */
1108 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1109 const struct in6_addr *srcs)
1111 struct ip6_sf_list *psf;
1115 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1116 if (scount == nsrcs)
1118 for (i = 0; i < nsrcs; i++) {
1119 /* skip inactive filters */
1120 if (psf->sf_count[MCAST_INCLUDE] ||
1121 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1122 psf->sf_count[MCAST_EXCLUDE])
1124 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1130 pmc->mca_flags &= ~MAF_GSQUERY;
1131 if (scount == nsrcs) /* all sources excluded */
1136 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1137 const struct in6_addr *srcs)
1139 struct ip6_sf_list *psf;
1142 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1143 return mld_xmarksources(pmc, nsrcs, srcs);
1145 /* mark INCLUDE-mode sources */
1148 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1149 if (scount == nsrcs)
1151 for (i = 0; i < nsrcs; i++) {
1152 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1160 pmc->mca_flags &= ~MAF_GSQUERY;
1163 pmc->mca_flags |= MAF_GSQUERY;
1167 static int mld_force_mld_version(const struct inet6_dev *idev)
1169 /* Normally, both are 0 here. If enforcement to a particular is
1170 * being used, individual device enforcement will have a lower
1171 * precedence over 'all' device (.../conf/all/force_mld_version).
1174 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1175 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1177 return idev->cnf.force_mld_version;
1180 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1182 return mld_force_mld_version(idev) == 2;
1185 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1187 return mld_force_mld_version(idev) == 1;
1190 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1192 if (mld_in_v2_mode_only(idev))
1194 if (mld_in_v1_mode_only(idev))
1196 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1202 static void mld_set_v1_mode(struct inet6_dev *idev)
1204 /* RFC3810, relevant sections:
1205 * - 9.1. Robustness Variable
1206 * - 9.2. Query Interval
1207 * - 9.3. Query Response Interval
1208 * - 9.12. Older Version Querier Present Timeout
1210 unsigned long switchback;
1212 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1214 idev->mc_v1_seen = jiffies + switchback;
1217 static void mld_update_qrv(struct inet6_dev *idev,
1218 const struct mld2_query *mlh2)
1220 /* RFC3810, relevant sections:
1221 * - 5.1.8. QRV (Querier's Robustness Variable)
1222 * - 9.1. Robustness Variable
1225 /* The value of the Robustness Variable MUST NOT be zero,
1226 * and SHOULD NOT be one. Catch this here if we ever run
1227 * into such a case in future.
1229 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1230 WARN_ON(idev->mc_qrv == 0);
1232 if (mlh2->mld2q_qrv > 0)
1233 idev->mc_qrv = mlh2->mld2q_qrv;
1235 if (unlikely(idev->mc_qrv < min_qrv)) {
1236 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1237 idev->mc_qrv, min_qrv);
1238 idev->mc_qrv = min_qrv;
1242 static void mld_update_qi(struct inet6_dev *idev,
1243 const struct mld2_query *mlh2)
1245 /* RFC3810, relevant sections:
1246 * - 5.1.9. QQIC (Querier's Query Interval Code)
1247 * - 9.2. Query Interval
1248 * - 9.12. Older Version Querier Present Timeout
1249 * (the [Query Interval] in the last Query received)
1251 unsigned long mc_qqi;
1253 if (mlh2->mld2q_qqic < 128) {
1254 mc_qqi = mlh2->mld2q_qqic;
1256 unsigned long mc_man, mc_exp;
1258 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1259 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1261 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1264 idev->mc_qi = mc_qqi * HZ;
1267 static void mld_update_qri(struct inet6_dev *idev,
1268 const struct mld2_query *mlh2)
1270 /* RFC3810, relevant sections:
1271 * - 5.1.3. Maximum Response Code
1272 * - 9.3. Query Response Interval
1274 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1277 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1278 unsigned long *max_delay, bool v1_query)
1280 unsigned long mldv1_md;
1282 /* Ignore v1 queries */
1283 if (mld_in_v2_mode_only(idev))
1286 mldv1_md = ntohs(mld->mld_maxdelay);
1288 /* When in MLDv1 fallback and a MLDv2 router start-up being
1289 * unaware of current MLDv1 operation, the MRC == MRD mapping
1290 * only works when the exponential algorithm is not being
1291 * used (as MLDv1 is unaware of such things).
1293 * According to the RFC author, the MLDv2 implementations
1294 * he's aware of all use a MRC < 32768 on start up queries.
1296 * Thus, should we *ever* encounter something else larger
1297 * than that, just assume the maximum possible within our
1301 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1303 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1305 /* MLDv1 router present: we need to go into v1 mode *only*
1306 * when an MLDv1 query is received as per section 9.12. of
1307 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1308 * queries MUST be of exactly 24 octets.
1311 mld_set_v1_mode(idev);
1313 /* cancel MLDv2 report timer */
1314 mld_gq_stop_timer(idev);
1315 /* cancel the interface change timer */
1316 mld_ifc_stop_timer(idev);
1317 /* clear deleted report items */
1318 mld_clear_delrec(idev);
1323 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1324 unsigned long *max_delay)
1326 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1328 mld_update_qrv(idev, mld);
1329 mld_update_qi(idev, mld);
1330 mld_update_qri(idev, mld);
1332 idev->mc_maxdelay = *max_delay;
1337 /* called with rcu_read_lock() */
1338 int igmp6_event_query(struct sk_buff *skb)
1340 struct mld2_query *mlh2 = NULL;
1341 struct ifmcaddr6 *ma;
1342 const struct in6_addr *group;
1343 unsigned long max_delay;
1344 struct inet6_dev *idev;
1345 struct mld_msg *mld;
1350 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1353 /* compute payload length excluding extension headers */
1354 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1355 len -= skb_network_header_len(skb);
1358 * Upon reception of an MLD message that contains a Query, the node
1359 * checks if the source address of the message is a valid link-local
1360 * address, if the Hop Limit is set to 1, and if the Router Alert
1361 * option is present in the Hop-By-Hop Options header of the IPv6
1362 * packet. If any of these checks fails, the packet is dropped.
1364 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1365 ipv6_hdr(skb)->hop_limit != 1 ||
1366 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1367 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1370 idev = __in6_dev_get(skb->dev);
1374 mld = (struct mld_msg *)icmp6_hdr(skb);
1375 group = &mld->mld_mca;
1376 group_type = ipv6_addr_type(group);
1378 if (group_type != IPV6_ADDR_ANY &&
1379 !(group_type&IPV6_ADDR_MULTICAST))
1382 if (len < MLD_V1_QUERY_LEN) {
1384 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1385 err = mld_process_v1(idev, mld, &max_delay,
1386 len == MLD_V1_QUERY_LEN);
1389 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1390 int srcs_offset = sizeof(struct mld2_query) -
1391 sizeof(struct icmp6hdr);
1393 if (!pskb_may_pull(skb, srcs_offset))
1396 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1398 err = mld_process_v2(idev, mlh2, &max_delay);
1402 if (group_type == IPV6_ADDR_ANY) { /* general query */
1403 if (mlh2->mld2q_nsrcs)
1404 return -EINVAL; /* no sources allowed */
1406 mld_gq_start_timer(idev);
1409 /* mark sources to include, if group & source-specific */
1410 if (mlh2->mld2q_nsrcs != 0) {
1411 if (!pskb_may_pull(skb, srcs_offset +
1412 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1415 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1422 read_lock_bh(&idev->lock);
1423 if (group_type == IPV6_ADDR_ANY) {
1424 for (ma = idev->mc_list; ma; ma = ma->next) {
1425 spin_lock_bh(&ma->mca_lock);
1426 igmp6_group_queried(ma, max_delay);
1427 spin_unlock_bh(&ma->mca_lock);
1430 for (ma = idev->mc_list; ma; ma = ma->next) {
1431 if (!ipv6_addr_equal(group, &ma->mca_addr))
1433 spin_lock_bh(&ma->mca_lock);
1434 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1435 /* gsquery <- gsquery && mark */
1437 ma->mca_flags &= ~MAF_GSQUERY;
1439 /* gsquery <- mark */
1441 ma->mca_flags |= MAF_GSQUERY;
1443 ma->mca_flags &= ~MAF_GSQUERY;
1445 if (!(ma->mca_flags & MAF_GSQUERY) ||
1446 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1447 igmp6_group_queried(ma, max_delay);
1448 spin_unlock_bh(&ma->mca_lock);
1452 read_unlock_bh(&idev->lock);
1457 /* called with rcu_read_lock() */
1458 int igmp6_event_report(struct sk_buff *skb)
1460 struct ifmcaddr6 *ma;
1461 struct inet6_dev *idev;
1462 struct mld_msg *mld;
1465 /* Our own report looped back. Ignore it. */
1466 if (skb->pkt_type == PACKET_LOOPBACK)
1469 /* send our report if the MC router may not have heard this report */
1470 if (skb->pkt_type != PACKET_MULTICAST &&
1471 skb->pkt_type != PACKET_BROADCAST)
1474 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1477 mld = (struct mld_msg *)icmp6_hdr(skb);
1479 /* Drop reports with not link local source */
1480 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1481 if (addr_type != IPV6_ADDR_ANY &&
1482 !(addr_type&IPV6_ADDR_LINKLOCAL))
1485 idev = __in6_dev_get(skb->dev);
1490 * Cancel the timer for this group
1493 read_lock_bh(&idev->lock);
1494 for (ma = idev->mc_list; ma; ma = ma->next) {
1495 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1496 spin_lock(&ma->mca_lock);
1497 if (del_timer(&ma->mca_timer))
1498 refcount_dec(&ma->mca_refcnt);
1499 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1500 spin_unlock(&ma->mca_lock);
1504 read_unlock_bh(&idev->lock);
1508 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1509 int gdeleted, int sdeleted)
1512 case MLD2_MODE_IS_INCLUDE:
1513 case MLD2_MODE_IS_EXCLUDE:
1514 if (gdeleted || sdeleted)
1516 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1517 if (pmc->mca_sfmode == MCAST_INCLUDE)
1519 /* don't include if this source is excluded
1522 if (psf->sf_count[MCAST_INCLUDE])
1523 return type == MLD2_MODE_IS_INCLUDE;
1524 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1525 psf->sf_count[MCAST_EXCLUDE];
1528 case MLD2_CHANGE_TO_INCLUDE:
1529 if (gdeleted || sdeleted)
1531 return psf->sf_count[MCAST_INCLUDE] != 0;
1532 case MLD2_CHANGE_TO_EXCLUDE:
1533 if (gdeleted || sdeleted)
1535 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1536 psf->sf_count[MCAST_INCLUDE])
1538 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1539 psf->sf_count[MCAST_EXCLUDE];
1540 case MLD2_ALLOW_NEW_SOURCES:
1541 if (gdeleted || !psf->sf_crcount)
1543 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1544 case MLD2_BLOCK_OLD_SOURCES:
1545 if (pmc->mca_sfmode == MCAST_INCLUDE)
1546 return gdeleted || (psf->sf_crcount && sdeleted);
1547 return psf->sf_crcount && !gdeleted && !sdeleted;
1553 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1555 struct ip6_sf_list *psf;
1558 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1559 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1566 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1567 struct net_device *dev,
1568 const struct in6_addr *saddr,
1569 const struct in6_addr *daddr,
1572 struct ipv6hdr *hdr;
1574 skb->protocol = htons(ETH_P_IPV6);
1577 skb_reset_network_header(skb);
1578 skb_put(skb, sizeof(struct ipv6hdr));
1579 hdr = ipv6_hdr(skb);
1581 ip6_flow_hdr(hdr, 0, 0);
1583 hdr->payload_len = htons(len);
1584 hdr->nexthdr = proto;
1585 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1587 hdr->saddr = *saddr;
1588 hdr->daddr = *daddr;
1591 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1593 struct net_device *dev = idev->dev;
1594 struct net *net = dev_net(dev);
1595 struct sock *sk = net->ipv6.igmp_sk;
1596 struct sk_buff *skb;
1597 struct mld2_report *pmr;
1598 struct in6_addr addr_buf;
1599 const struct in6_addr *saddr;
1600 int hlen = LL_RESERVED_SPACE(dev);
1601 int tlen = dev->needed_tailroom;
1602 unsigned int size = mtu + hlen + tlen;
1604 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1605 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1608 /* we assume size > sizeof(ra) here */
1609 skb = sock_alloc_send_skb(sk, size, 1, &err);
1613 skb->priority = TC_PRIO_CONTROL;
1614 skb_reserve(skb, hlen);
1615 skb_tailroom_reserve(skb, mtu, tlen);
1617 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1618 /* <draft-ietf-magma-mld-source-05.txt>:
1619 * use unspecified address as the source address
1620 * when a valid link-local address is not available.
1622 saddr = &in6addr_any;
1626 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1628 skb_put_data(skb, ra, sizeof(ra));
1630 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1631 skb_put(skb, sizeof(*pmr));
1632 pmr = (struct mld2_report *)skb_transport_header(skb);
1633 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1634 pmr->mld2r_resv1 = 0;
1635 pmr->mld2r_cksum = 0;
1636 pmr->mld2r_resv2 = 0;
1637 pmr->mld2r_ngrec = 0;
1641 static void mld_sendpack(struct sk_buff *skb)
1643 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1644 struct mld2_report *pmr =
1645 (struct mld2_report *)skb_transport_header(skb);
1646 int payload_len, mldlen;
1647 struct inet6_dev *idev;
1648 struct net *net = dev_net(skb->dev);
1651 struct dst_entry *dst;
1654 idev = __in6_dev_get(skb->dev);
1655 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1657 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1659 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1660 pip6->payload_len = htons(payload_len);
1662 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1664 csum_partial(skb_transport_header(skb),
1667 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1668 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1670 dst = icmp6_dst_alloc(skb->dev, &fl6);
1677 skb_dst_set(skb, dst);
1681 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1682 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1686 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1687 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1689 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1700 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1702 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1705 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1706 int type, struct mld2_grec **ppgr, unsigned int mtu)
1708 struct mld2_report *pmr;
1709 struct mld2_grec *pgr;
1712 skb = mld_newpack(pmc->idev, mtu);
1716 pgr = skb_put(skb, sizeof(struct mld2_grec));
1717 pgr->grec_type = type;
1718 pgr->grec_auxwords = 0;
1719 pgr->grec_nsrcs = 0;
1720 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1721 pmr = (struct mld2_report *)skb_transport_header(skb);
1722 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1727 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1729 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1730 int type, int gdeleted, int sdeleted, int crsend)
1732 struct inet6_dev *idev = pmc->idev;
1733 struct net_device *dev = idev->dev;
1734 struct mld2_report *pmr;
1735 struct mld2_grec *pgr = NULL;
1736 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1737 int scount, stotal, first, isquery, truncate;
1740 if (pmc->mca_flags & MAF_NOREPORT)
1743 mtu = READ_ONCE(dev->mtu);
1744 if (mtu < IPV6_MIN_MTU)
1747 isquery = type == MLD2_MODE_IS_INCLUDE ||
1748 type == MLD2_MODE_IS_EXCLUDE;
1749 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1750 type == MLD2_CHANGE_TO_EXCLUDE;
1752 stotal = scount = 0;
1754 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1759 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1761 /* EX and TO_EX get a fresh packet, if needed */
1763 if (pmr && pmr->mld2r_ngrec &&
1764 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1767 skb = mld_newpack(idev, mtu);
1772 for (psf = *psf_list; psf; psf = psf_next) {
1773 struct in6_addr *psrc;
1775 psf_next = psf->sf_next;
1777 if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1782 /* Based on RFC3810 6.1. Should not send source-list change
1783 * records when there is a filter mode change.
1785 if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1786 (!gdeleted && pmc->mca_crcount)) &&
1787 (type == MLD2_ALLOW_NEW_SOURCES ||
1788 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1789 goto decrease_sf_crcount;
1791 /* clear marks on query responses */
1795 if (AVAILABLE(skb) < sizeof(*psrc) +
1796 first*sizeof(struct mld2_grec)) {
1797 if (truncate && !first)
1798 break; /* truncate these */
1800 pgr->grec_nsrcs = htons(scount);
1803 skb = mld_newpack(idev, mtu);
1808 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1813 psrc = skb_put(skb, sizeof(*psrc));
1814 *psrc = psf->sf_addr;
1816 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1817 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1818 decrease_sf_crcount:
1820 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1822 psf_prev->sf_next = psf->sf_next;
1824 *psf_list = psf->sf_next;
1834 if (type == MLD2_ALLOW_NEW_SOURCES ||
1835 type == MLD2_BLOCK_OLD_SOURCES)
1837 if (pmc->mca_crcount || isquery || crsend) {
1838 /* make sure we have room for group header */
1839 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1841 skb = NULL; /* add_grhead will get a new one */
1843 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1847 pgr->grec_nsrcs = htons(scount);
1850 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1854 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1856 struct sk_buff *skb = NULL;
1859 read_lock_bh(&idev->lock);
1861 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1862 if (pmc->mca_flags & MAF_NOREPORT)
1864 spin_lock_bh(&pmc->mca_lock);
1865 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1866 type = MLD2_MODE_IS_EXCLUDE;
1868 type = MLD2_MODE_IS_INCLUDE;
1869 skb = add_grec(skb, pmc, type, 0, 0, 0);
1870 spin_unlock_bh(&pmc->mca_lock);
1873 spin_lock_bh(&pmc->mca_lock);
1874 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1875 type = MLD2_MODE_IS_EXCLUDE;
1877 type = MLD2_MODE_IS_INCLUDE;
1878 skb = add_grec(skb, pmc, type, 0, 0, 0);
1879 spin_unlock_bh(&pmc->mca_lock);
1881 read_unlock_bh(&idev->lock);
1887 * remove zero-count source records from a source filter list
1889 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1891 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1894 for (psf = *ppsf; psf; psf = psf_next) {
1895 psf_next = psf->sf_next;
1896 if (psf->sf_crcount == 0) {
1898 psf_prev->sf_next = psf->sf_next;
1900 *ppsf = psf->sf_next;
1907 static void mld_send_cr(struct inet6_dev *idev)
1909 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1910 struct sk_buff *skb = NULL;
1913 read_lock_bh(&idev->lock);
1914 spin_lock(&idev->mc_lock);
1918 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1919 pmc_next = pmc->next;
1920 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1921 type = MLD2_BLOCK_OLD_SOURCES;
1922 dtype = MLD2_BLOCK_OLD_SOURCES;
1923 skb = add_grec(skb, pmc, type, 1, 0, 0);
1924 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1926 if (pmc->mca_crcount) {
1927 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1928 type = MLD2_CHANGE_TO_INCLUDE;
1929 skb = add_grec(skb, pmc, type, 1, 0, 0);
1932 if (pmc->mca_crcount == 0) {
1933 mld_clear_zeros(&pmc->mca_tomb);
1934 mld_clear_zeros(&pmc->mca_sources);
1937 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1938 !pmc->mca_sources) {
1940 pmc_prev->next = pmc_next;
1942 idev->mc_tomb = pmc_next;
1943 in6_dev_put(pmc->idev);
1948 spin_unlock(&idev->mc_lock);
1951 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1952 spin_lock_bh(&pmc->mca_lock);
1953 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1954 type = MLD2_BLOCK_OLD_SOURCES;
1955 dtype = MLD2_ALLOW_NEW_SOURCES;
1957 type = MLD2_ALLOW_NEW_SOURCES;
1958 dtype = MLD2_BLOCK_OLD_SOURCES;
1960 skb = add_grec(skb, pmc, type, 0, 0, 0);
1961 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1963 /* filter mode changes */
1964 if (pmc->mca_crcount) {
1965 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1966 type = MLD2_CHANGE_TO_EXCLUDE;
1968 type = MLD2_CHANGE_TO_INCLUDE;
1969 skb = add_grec(skb, pmc, type, 0, 0, 0);
1972 spin_unlock_bh(&pmc->mca_lock);
1974 read_unlock_bh(&idev->lock);
1977 (void) mld_sendpack(skb);
1980 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1982 struct net *net = dev_net(dev);
1983 struct sock *sk = net->ipv6.igmp_sk;
1984 struct inet6_dev *idev;
1985 struct sk_buff *skb;
1986 struct mld_msg *hdr;
1987 const struct in6_addr *snd_addr, *saddr;
1988 struct in6_addr addr_buf;
1989 int hlen = LL_RESERVED_SPACE(dev);
1990 int tlen = dev->needed_tailroom;
1991 int err, len, payload_len, full_len;
1992 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1993 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1996 struct dst_entry *dst;
1998 if (type == ICMPV6_MGM_REDUCTION)
1999 snd_addr = &in6addr_linklocal_allrouters;
2003 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2004 payload_len = len + sizeof(ra);
2005 full_len = sizeof(struct ipv6hdr) + payload_len;
2008 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2009 IPSTATS_MIB_OUT, full_len);
2012 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2016 IP6_INC_STATS(net, __in6_dev_get(dev),
2017 IPSTATS_MIB_OUTDISCARDS);
2021 skb->priority = TC_PRIO_CONTROL;
2022 skb_reserve(skb, hlen);
2024 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2025 /* <draft-ietf-magma-mld-source-05.txt>:
2026 * use unspecified address as the source address
2027 * when a valid link-local address is not available.
2029 saddr = &in6addr_any;
2033 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2035 skb_put_data(skb, ra, sizeof(ra));
2037 hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2038 hdr->mld_type = type;
2039 hdr->mld_mca = *addr;
2041 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2043 csum_partial(hdr, len, 0));
2046 idev = __in6_dev_get(skb->dev);
2048 icmpv6_flow_init(sk, &fl6, type,
2049 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2051 dst = icmp6_dst_alloc(skb->dev, &fl6);
2057 skb_dst_set(skb, dst);
2058 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2059 net, sk, skb, NULL, skb->dev,
2063 ICMP6MSGOUT_INC_STATS(net, idev, type);
2064 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2066 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2076 static void mld_send_initial_cr(struct inet6_dev *idev)
2078 struct sk_buff *skb;
2079 struct ifmcaddr6 *pmc;
2082 if (mld_in_v1_mode(idev))
2086 read_lock_bh(&idev->lock);
2087 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2088 spin_lock_bh(&pmc->mca_lock);
2089 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2090 type = MLD2_CHANGE_TO_EXCLUDE;
2092 type = MLD2_ALLOW_NEW_SOURCES;
2093 skb = add_grec(skb, pmc, type, 0, 0, 1);
2094 spin_unlock_bh(&pmc->mca_lock);
2096 read_unlock_bh(&idev->lock);
2101 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2103 idev->mc_dad_count = idev->mc_qrv;
2104 if (idev->mc_dad_count) {
2105 mld_send_initial_cr(idev);
2106 idev->mc_dad_count--;
2107 if (idev->mc_dad_count)
2108 mld_dad_start_timer(idev,
2109 unsolicited_report_interval(idev));
2113 static void mld_dad_timer_expire(struct timer_list *t)
2115 struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
2117 mld_send_initial_cr(idev);
2118 if (idev->mc_dad_count) {
2119 idev->mc_dad_count--;
2120 if (idev->mc_dad_count)
2121 mld_dad_start_timer(idev,
2122 unsolicited_report_interval(idev));
2127 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2128 const struct in6_addr *psfsrc)
2130 struct ip6_sf_list *psf, *psf_prev;
2134 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2135 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2139 if (!psf || psf->sf_count[sfmode] == 0) {
2140 /* source filter not found, or count wrong => bug */
2143 psf->sf_count[sfmode]--;
2144 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2145 struct inet6_dev *idev = pmc->idev;
2147 /* no more filters for this source */
2149 psf_prev->sf_next = psf->sf_next;
2151 pmc->mca_sources = psf->sf_next;
2152 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2153 !mld_in_v1_mode(idev)) {
2154 psf->sf_crcount = idev->mc_qrv;
2155 psf->sf_next = pmc->mca_tomb;
2156 pmc->mca_tomb = psf;
2164 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2165 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2168 struct ifmcaddr6 *pmc;
2174 read_lock_bh(&idev->lock);
2175 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2176 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2180 /* MCA not found?? bug */
2181 read_unlock_bh(&idev->lock);
2184 spin_lock_bh(&pmc->mca_lock);
2187 if (!pmc->mca_sfcount[sfmode]) {
2188 spin_unlock_bh(&pmc->mca_lock);
2189 read_unlock_bh(&idev->lock);
2192 pmc->mca_sfcount[sfmode]--;
2195 for (i = 0; i < sfcount; i++) {
2196 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2198 changerec |= rv > 0;
2202 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2203 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2204 pmc->mca_sfcount[MCAST_INCLUDE]) {
2205 struct ip6_sf_list *psf;
2207 /* filter mode change */
2208 pmc->mca_sfmode = MCAST_INCLUDE;
2209 pmc->mca_crcount = idev->mc_qrv;
2210 idev->mc_ifc_count = pmc->mca_crcount;
2211 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2212 psf->sf_crcount = 0;
2213 mld_ifc_event(pmc->idev);
2214 } else if (sf_setstate(pmc) || changerec)
2215 mld_ifc_event(pmc->idev);
2216 spin_unlock_bh(&pmc->mca_lock);
2217 read_unlock_bh(&idev->lock);
2222 * Add multicast single-source filter to the interface list
2224 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2225 const struct in6_addr *psfsrc)
2227 struct ip6_sf_list *psf, *psf_prev;
2230 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2231 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2236 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2240 psf->sf_addr = *psfsrc;
2242 psf_prev->sf_next = psf;
2244 pmc->mca_sources = psf;
2246 psf->sf_count[sfmode]++;
2250 static void sf_markstate(struct ifmcaddr6 *pmc)
2252 struct ip6_sf_list *psf;
2253 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2255 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2256 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2257 psf->sf_oldin = mca_xcount ==
2258 psf->sf_count[MCAST_EXCLUDE] &&
2259 !psf->sf_count[MCAST_INCLUDE];
2261 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2264 static int sf_setstate(struct ifmcaddr6 *pmc)
2266 struct ip6_sf_list *psf, *dpsf;
2267 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2268 int qrv = pmc->idev->mc_qrv;
2272 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2273 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2274 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2275 !psf->sf_count[MCAST_INCLUDE];
2277 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2279 if (!psf->sf_oldin) {
2280 struct ip6_sf_list *prev = NULL;
2282 for (dpsf = pmc->mca_tomb; dpsf;
2283 dpsf = dpsf->sf_next) {
2284 if (ipv6_addr_equal(&dpsf->sf_addr,
2291 prev->sf_next = dpsf->sf_next;
2293 pmc->mca_tomb = dpsf->sf_next;
2296 psf->sf_crcount = qrv;
2299 } else if (psf->sf_oldin) {
2300 psf->sf_crcount = 0;
2302 * add or update "delete" records if an active filter
2305 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2306 if (ipv6_addr_equal(&dpsf->sf_addr,
2310 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2314 /* pmc->mca_lock held by callers */
2315 dpsf->sf_next = pmc->mca_tomb;
2316 pmc->mca_tomb = dpsf;
2318 dpsf->sf_crcount = qrv;
2326 * Add multicast source filter list to the interface list
2328 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2329 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2332 struct ifmcaddr6 *pmc;
2338 read_lock_bh(&idev->lock);
2339 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2340 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2344 /* MCA not found?? bug */
2345 read_unlock_bh(&idev->lock);
2348 spin_lock_bh(&pmc->mca_lock);
2351 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2353 pmc->mca_sfcount[sfmode]++;
2355 for (i = 0; i < sfcount; i++) {
2356 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2364 pmc->mca_sfcount[sfmode]--;
2365 for (j = 0; j < i; j++)
2366 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2367 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2368 struct ip6_sf_list *psf;
2370 /* filter mode change */
2371 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2372 pmc->mca_sfmode = MCAST_EXCLUDE;
2373 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2374 pmc->mca_sfmode = MCAST_INCLUDE;
2375 /* else no filters; keep old mode for reports */
2377 pmc->mca_crcount = idev->mc_qrv;
2378 idev->mc_ifc_count = pmc->mca_crcount;
2379 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2380 psf->sf_crcount = 0;
2381 mld_ifc_event(idev);
2382 } else if (sf_setstate(pmc))
2383 mld_ifc_event(idev);
2384 spin_unlock_bh(&pmc->mca_lock);
2385 read_unlock_bh(&idev->lock);
2389 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2391 struct ip6_sf_list *psf, *nextpsf;
2393 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2394 nextpsf = psf->sf_next;
2397 pmc->mca_tomb = NULL;
2398 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2399 nextpsf = psf->sf_next;
2402 pmc->mca_sources = NULL;
2403 pmc->mca_sfmode = MCAST_EXCLUDE;
2404 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2405 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2409 static void igmp6_join_group(struct ifmcaddr6 *ma)
2411 unsigned long delay;
2413 if (ma->mca_flags & MAF_NOREPORT)
2416 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2418 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2420 spin_lock_bh(&ma->mca_lock);
2421 if (del_timer(&ma->mca_timer)) {
2422 refcount_dec(&ma->mca_refcnt);
2423 delay = ma->mca_timer.expires - jiffies;
2426 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2427 refcount_inc(&ma->mca_refcnt);
2428 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2429 spin_unlock_bh(&ma->mca_lock);
2432 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2433 struct inet6_dev *idev)
2437 write_lock_bh(&iml->sflock);
2439 /* any-source empty exclude case */
2440 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2442 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2443 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2444 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2447 write_unlock_bh(&iml->sflock);
2451 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2453 if (mld_in_v1_mode(ma->idev)) {
2454 if (ma->mca_flags & MAF_LAST_REPORTER)
2455 igmp6_send(&ma->mca_addr, ma->idev->dev,
2456 ICMPV6_MGM_REDUCTION);
2458 mld_add_delrec(ma->idev, ma);
2459 mld_ifc_event(ma->idev);
2463 static void mld_gq_timer_expire(struct timer_list *t)
2465 struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
2467 idev->mc_gq_running = 0;
2468 mld_send_report(idev, NULL);
2472 static void mld_ifc_timer_expire(struct timer_list *t)
2474 struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
2477 if (idev->mc_ifc_count) {
2478 idev->mc_ifc_count--;
2479 if (idev->mc_ifc_count)
2480 mld_ifc_start_timer(idev,
2481 unsolicited_report_interval(idev));
2486 static void mld_ifc_event(struct inet6_dev *idev)
2488 if (mld_in_v1_mode(idev))
2490 idev->mc_ifc_count = idev->mc_qrv;
2491 mld_ifc_start_timer(idev, 1);
2494 static void igmp6_timer_handler(struct timer_list *t)
2496 struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
2498 if (mld_in_v1_mode(ma->idev))
2499 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2501 mld_send_report(ma->idev, ma);
2503 spin_lock(&ma->mca_lock);
2504 ma->mca_flags |= MAF_LAST_REPORTER;
2505 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2506 spin_unlock(&ma->mca_lock);
2510 /* Device changing type */
2512 void ipv6_mc_unmap(struct inet6_dev *idev)
2514 struct ifmcaddr6 *i;
2516 /* Install multicast list, except for all-nodes (already installed) */
2518 read_lock_bh(&idev->lock);
2519 for (i = idev->mc_list; i; i = i->next)
2520 igmp6_group_dropped(i);
2521 read_unlock_bh(&idev->lock);
2524 void ipv6_mc_remap(struct inet6_dev *idev)
2529 /* Device going down */
2531 void ipv6_mc_down(struct inet6_dev *idev)
2533 struct ifmcaddr6 *i;
2535 /* Withdraw multicast list */
2537 read_lock_bh(&idev->lock);
2539 for (i = idev->mc_list; i; i = i->next)
2540 igmp6_group_dropped(i);
2542 /* Should stop timer after group drop. or we will
2543 * start timer again in mld_ifc_event()
2545 mld_ifc_stop_timer(idev);
2546 mld_gq_stop_timer(idev);
2547 mld_dad_stop_timer(idev);
2548 read_unlock_bh(&idev->lock);
2551 static void ipv6_mc_reset(struct inet6_dev *idev)
2553 idev->mc_qrv = sysctl_mld_qrv;
2554 idev->mc_qi = MLD_QI_DEFAULT;
2555 idev->mc_qri = MLD_QRI_DEFAULT;
2556 idev->mc_v1_seen = 0;
2557 idev->mc_maxdelay = unsolicited_report_interval(idev);
2560 /* Device going up */
2562 void ipv6_mc_up(struct inet6_dev *idev)
2564 struct ifmcaddr6 *i;
2566 /* Install multicast list, except for all-nodes (already installed) */
2568 read_lock_bh(&idev->lock);
2569 ipv6_mc_reset(idev);
2570 for (i = idev->mc_list; i; i = i->next) {
2571 mld_del_delrec(idev, i);
2572 igmp6_group_added(i);
2574 read_unlock_bh(&idev->lock);
2577 /* IPv6 device initialization. */
2579 void ipv6_mc_init_dev(struct inet6_dev *idev)
2581 write_lock_bh(&idev->lock);
2582 spin_lock_init(&idev->mc_lock);
2583 idev->mc_gq_running = 0;
2584 timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
2585 idev->mc_tomb = NULL;
2586 idev->mc_ifc_count = 0;
2587 timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2588 timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2589 ipv6_mc_reset(idev);
2590 write_unlock_bh(&idev->lock);
2594 * Device is about to be destroyed: clean up.
2597 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2599 struct ifmcaddr6 *i;
2601 /* Deactivate timers */
2603 mld_clear_delrec(idev);
2605 /* Delete all-nodes address. */
2606 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2607 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2610 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2612 if (idev->cnf.forwarding)
2613 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2615 write_lock_bh(&idev->lock);
2616 while ((i = idev->mc_list) != NULL) {
2617 idev->mc_list = i->next;
2619 write_unlock_bh(&idev->lock);
2620 ip6_mc_clear_src(i);
2622 write_lock_bh(&idev->lock);
2624 write_unlock_bh(&idev->lock);
2627 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2629 struct ifmcaddr6 *pmc;
2633 if (mld_in_v1_mode(idev)) {
2634 read_lock_bh(&idev->lock);
2635 for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2636 igmp6_join_group(pmc);
2637 read_unlock_bh(&idev->lock);
2639 mld_send_report(idev, NULL);
2642 static int ipv6_mc_netdev_event(struct notifier_block *this,
2643 unsigned long event,
2646 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2647 struct inet6_dev *idev = __in6_dev_get(dev);
2650 case NETDEV_RESEND_IGMP:
2652 ipv6_mc_rejoin_groups(idev);
2661 static struct notifier_block igmp6_netdev_notifier = {
2662 .notifier_call = ipv6_mc_netdev_event,
2665 #ifdef CONFIG_PROC_FS
2666 struct igmp6_mc_iter_state {
2667 struct seq_net_private p;
2668 struct net_device *dev;
2669 struct inet6_dev *idev;
2672 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2674 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2676 struct ifmcaddr6 *im = NULL;
2677 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2678 struct net *net = seq_file_net(seq);
2681 for_each_netdev_rcu(net, state->dev) {
2682 struct inet6_dev *idev;
2683 idev = __in6_dev_get(state->dev);
2686 read_lock_bh(&idev->lock);
2692 read_unlock_bh(&idev->lock);
2697 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2699 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2703 if (likely(state->idev))
2704 read_unlock_bh(&state->idev->lock);
2706 state->dev = next_net_device_rcu(state->dev);
2711 state->idev = __in6_dev_get(state->dev);
2714 read_lock_bh(&state->idev->lock);
2715 im = state->idev->mc_list;
2720 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2722 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2724 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2726 return pos ? NULL : im;
2729 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2733 return igmp6_mc_get_idx(seq, *pos);
2736 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2738 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2744 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2747 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2749 if (likely(state->idev)) {
2750 read_unlock_bh(&state->idev->lock);
2757 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2759 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2760 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2763 "%-4d %-15s %pi6 %5d %08X %ld\n",
2764 state->dev->ifindex, state->dev->name,
2766 im->mca_users, im->mca_flags,
2767 (im->mca_flags&MAF_TIMER_RUNNING) ?
2768 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2772 static const struct seq_operations igmp6_mc_seq_ops = {
2773 .start = igmp6_mc_seq_start,
2774 .next = igmp6_mc_seq_next,
2775 .stop = igmp6_mc_seq_stop,
2776 .show = igmp6_mc_seq_show,
2779 struct igmp6_mcf_iter_state {
2780 struct seq_net_private p;
2781 struct net_device *dev;
2782 struct inet6_dev *idev;
2783 struct ifmcaddr6 *im;
2786 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2788 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2790 struct ip6_sf_list *psf = NULL;
2791 struct ifmcaddr6 *im = NULL;
2792 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2793 struct net *net = seq_file_net(seq);
2797 for_each_netdev_rcu(net, state->dev) {
2798 struct inet6_dev *idev;
2799 idev = __in6_dev_get(state->dev);
2800 if (unlikely(idev == NULL))
2802 read_lock_bh(&idev->lock);
2805 spin_lock_bh(&im->mca_lock);
2806 psf = im->mca_sources;
2812 spin_unlock_bh(&im->mca_lock);
2814 read_unlock_bh(&idev->lock);
2819 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2821 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2825 spin_unlock_bh(&state->im->mca_lock);
2826 state->im = state->im->next;
2827 while (!state->im) {
2828 if (likely(state->idev))
2829 read_unlock_bh(&state->idev->lock);
2831 state->dev = next_net_device_rcu(state->dev);
2836 state->idev = __in6_dev_get(state->dev);
2839 read_lock_bh(&state->idev->lock);
2840 state->im = state->idev->mc_list;
2844 spin_lock_bh(&state->im->mca_lock);
2845 psf = state->im->mca_sources;
2851 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2853 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2855 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2857 return pos ? NULL : psf;
2860 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2864 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2867 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2869 struct ip6_sf_list *psf;
2870 if (v == SEQ_START_TOKEN)
2871 psf = igmp6_mcf_get_first(seq);
2873 psf = igmp6_mcf_get_next(seq, v);
2878 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2881 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2882 if (likely(state->im)) {
2883 spin_unlock_bh(&state->im->mca_lock);
2886 if (likely(state->idev)) {
2887 read_unlock_bh(&state->idev->lock);
2894 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2896 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2897 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2899 if (v == SEQ_START_TOKEN) {
2900 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2903 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2904 state->dev->ifindex, state->dev->name,
2905 &state->im->mca_addr,
2907 psf->sf_count[MCAST_INCLUDE],
2908 psf->sf_count[MCAST_EXCLUDE]);
2913 static const struct seq_operations igmp6_mcf_seq_ops = {
2914 .start = igmp6_mcf_seq_start,
2915 .next = igmp6_mcf_seq_next,
2916 .stop = igmp6_mcf_seq_stop,
2917 .show = igmp6_mcf_seq_show,
2920 static int __net_init igmp6_proc_init(struct net *net)
2925 if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
2926 sizeof(struct igmp6_mc_iter_state)))
2928 if (!proc_create_net("mcfilter6", 0444, net->proc_net,
2930 sizeof(struct igmp6_mcf_iter_state)))
2931 goto out_proc_net_igmp6;
2938 remove_proc_entry("igmp6", net->proc_net);
2942 static void __net_exit igmp6_proc_exit(struct net *net)
2944 remove_proc_entry("mcfilter6", net->proc_net);
2945 remove_proc_entry("igmp6", net->proc_net);
2948 static inline int igmp6_proc_init(struct net *net)
2952 static inline void igmp6_proc_exit(struct net *net)
2957 static int __net_init igmp6_net_init(struct net *net)
2961 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2962 SOCK_RAW, IPPROTO_ICMPV6, net);
2964 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2969 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2971 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2972 SOCK_RAW, IPPROTO_ICMPV6, net);
2974 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2976 goto out_sock_create;
2979 err = igmp6_proc_init(net);
2981 goto out_sock_create_autojoin;
2985 out_sock_create_autojoin:
2986 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2988 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2993 static void __net_exit igmp6_net_exit(struct net *net)
2995 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2996 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2997 igmp6_proc_exit(net);
3000 static struct pernet_operations igmp6_net_ops = {
3001 .init = igmp6_net_init,
3002 .exit = igmp6_net_exit,
3005 int __init igmp6_init(void)
3007 return register_pernet_subsys(&igmp6_net_ops);
3010 int __init igmp6_late_init(void)
3012 return register_netdevice_notifier(&igmp6_netdev_notifier);
3015 void igmp6_cleanup(void)
3017 unregister_pernet_subsys(&igmp6_net_ops);
3020 void igmp6_late_cleanup(void)
3022 unregister_netdevice_notifier(&igmp6_netdev_notifier);