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);
287 while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
288 struct net_device *dev;
290 np->ipv6_mc_list = mc_lst->next;
292 dev = __dev_get_by_index(net, mc_lst->ifindex);
294 struct inet6_dev *idev = __in6_dev_get(dev);
296 (void) ip6_mc_leave_src(sk, mc_lst, idev);
298 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
300 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
302 atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
303 kfree_rcu(mc_lst, rcu);
307 void ipv6_sock_mc_close(struct sock *sk)
309 struct ipv6_pinfo *np = inet6_sk(sk);
311 if (!rcu_access_pointer(np->ipv6_mc_list))
314 __ipv6_sock_mc_close(sk);
318 int ip6_mc_source(int add, int omode, struct sock *sk,
319 struct group_source_req *pgsr)
321 struct in6_addr *source, *group;
322 struct ipv6_mc_socklist *pmc;
323 struct inet6_dev *idev;
324 struct ipv6_pinfo *inet6 = inet6_sk(sk);
325 struct ip6_sf_socklist *psl;
326 struct net *net = sock_net(sk);
332 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
333 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
335 if (!ipv6_addr_is_multicast(group))
339 idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
345 err = -EADDRNOTAVAIL;
347 for_each_pmc_rcu(inet6, pmc) {
348 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
350 if (ipv6_addr_equal(&pmc->addr, group))
353 if (!pmc) { /* must have a prior join */
357 /* if a source filter was set, must be the same mode as before */
359 if (pmc->sfmode != omode) {
363 } else if (pmc->sfmode != omode) {
364 /* allow mode switches for empty-set filters */
365 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
366 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
370 write_lock(&pmc->sflock);
376 goto done; /* err = -EADDRNOTAVAIL */
378 for (i = 0; i < psl->sl_count; i++) {
379 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
383 if (rv) /* source not found */
384 goto done; /* err = -EADDRNOTAVAIL */
386 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
387 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
392 /* update the interface filter */
393 ip6_mc_del_src(idev, group, omode, 1, source, 1);
395 for (j = i+1; j < psl->sl_count; j++)
396 psl->sl_addr[j-1] = psl->sl_addr[j];
401 /* else, add a new source to the filter */
403 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
407 if (!psl || psl->sl_count == psl->sl_max) {
408 struct ip6_sf_socklist *newpsl;
409 int count = IP6_SFBLOCK;
412 count += psl->sl_max;
413 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
418 newpsl->sl_max = count;
419 newpsl->sl_count = count - IP6_SFBLOCK;
421 for (i = 0; i < psl->sl_count; i++)
422 newpsl->sl_addr[i] = psl->sl_addr[i];
423 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
425 pmc->sflist = psl = newpsl;
427 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
428 for (i = 0; i < psl->sl_count; i++) {
429 rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
430 if (rv == 0) /* There is an error in the address. */
433 for (j = psl->sl_count-1; j >= i; j--)
434 psl->sl_addr[j+1] = psl->sl_addr[j];
435 psl->sl_addr[i] = *source;
438 /* update the interface list */
439 ip6_mc_add_src(idev, group, omode, 1, source, 1);
442 write_unlock(&pmc->sflock);
443 read_unlock_bh(&idev->lock);
446 err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
450 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
452 const struct in6_addr *group;
453 struct ipv6_mc_socklist *pmc;
454 struct inet6_dev *idev;
455 struct ipv6_pinfo *inet6 = inet6_sk(sk);
456 struct ip6_sf_socklist *newpsl, *psl;
457 struct net *net = sock_net(sk);
461 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
463 if (!ipv6_addr_is_multicast(group))
465 if (gsf->gf_fmode != MCAST_INCLUDE &&
466 gsf->gf_fmode != MCAST_EXCLUDE)
470 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
479 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
484 for_each_pmc_rcu(inet6, pmc) {
485 if (pmc->ifindex != gsf->gf_interface)
487 if (ipv6_addr_equal(&pmc->addr, group))
490 if (!pmc) { /* must have a prior join */
494 if (gsf->gf_numsrc) {
495 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
501 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
502 for (i = 0; i < newpsl->sl_count; ++i) {
503 struct sockaddr_in6 *psin6;
505 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
506 newpsl->sl_addr[i] = psin6->sin6_addr;
508 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
509 newpsl->sl_count, newpsl->sl_addr, 0);
511 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
516 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
519 write_lock(&pmc->sflock);
522 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
523 psl->sl_count, psl->sl_addr, 0);
524 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
526 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
527 pmc->sflist = newpsl;
528 pmc->sfmode = gsf->gf_fmode;
529 write_unlock(&pmc->sflock);
532 read_unlock_bh(&idev->lock);
535 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
539 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
540 struct group_filter __user *optval, int __user *optlen)
542 int err, i, count, copycount;
543 const struct in6_addr *group;
544 struct ipv6_mc_socklist *pmc;
545 struct inet6_dev *idev;
546 struct ipv6_pinfo *inet6 = inet6_sk(sk);
547 struct ip6_sf_socklist *psl;
548 struct net *net = sock_net(sk);
550 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
552 if (!ipv6_addr_is_multicast(group))
556 idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
563 err = -EADDRNOTAVAIL;
564 /* changes to the ipv6_mc_list require the socket lock and
565 * rtnl lock. We have the socket lock and rcu read lock,
566 * so reading the list is safe.
569 for_each_pmc_rcu(inet6, pmc) {
570 if (pmc->ifindex != gsf->gf_interface)
572 if (ipv6_addr_equal(group, &pmc->addr))
575 if (!pmc) /* must have a prior join */
577 gsf->gf_fmode = pmc->sfmode;
579 count = psl ? psl->sl_count : 0;
580 read_unlock_bh(&idev->lock);
583 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
584 gsf->gf_numsrc = count;
585 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
586 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
589 /* changes to psl require the socket lock, and a write lock
590 * on pmc->sflock. We have the socket lock so reading here is safe.
592 for (i = 0; i < copycount; i++) {
593 struct sockaddr_in6 *psin6;
594 struct sockaddr_storage ss;
596 psin6 = (struct sockaddr_in6 *)&ss;
597 memset(&ss, 0, sizeof(ss));
598 psin6->sin6_family = AF_INET6;
599 psin6->sin6_addr = psl->sl_addr[i];
600 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
605 read_unlock_bh(&idev->lock);
610 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
611 const struct in6_addr *src_addr)
613 struct ipv6_pinfo *np = inet6_sk(sk);
614 struct ipv6_mc_socklist *mc;
615 struct ip6_sf_socklist *psl;
619 for_each_pmc_rcu(np, mc) {
620 if (ipv6_addr_equal(&mc->addr, mc_addr))
627 read_lock(&mc->sflock);
630 rv = mc->sfmode == MCAST_EXCLUDE;
634 for (i = 0; i < psl->sl_count; i++) {
635 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
638 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
640 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
643 read_unlock(&mc->sflock);
649 static void igmp6_group_added(struct ifmcaddr6 *mc)
651 struct net_device *dev = mc->idev->dev;
652 char buf[MAX_ADDR_LEN];
654 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
655 IPV6_ADDR_SCOPE_LINKLOCAL)
658 spin_lock_bh(&mc->mca_lock);
659 if (!(mc->mca_flags&MAF_LOADED)) {
660 mc->mca_flags |= MAF_LOADED;
661 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
662 dev_mc_add(dev, buf);
664 spin_unlock_bh(&mc->mca_lock);
666 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
669 if (mld_in_v1_mode(mc->idev)) {
670 igmp6_join_group(mc);
675 mc->mca_crcount = mc->idev->mc_qrv;
676 mld_ifc_event(mc->idev);
679 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
681 struct net_device *dev = mc->idev->dev;
682 char buf[MAX_ADDR_LEN];
684 if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
685 IPV6_ADDR_SCOPE_LINKLOCAL)
688 spin_lock_bh(&mc->mca_lock);
689 if (mc->mca_flags&MAF_LOADED) {
690 mc->mca_flags &= ~MAF_LOADED;
691 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
692 dev_mc_del(dev, buf);
695 if (mc->mca_flags & MAF_NOREPORT)
697 spin_unlock_bh(&mc->mca_lock);
700 igmp6_leave_group(mc);
702 spin_lock_bh(&mc->mca_lock);
703 if (del_timer(&mc->mca_timer))
704 atomic_dec(&mc->mca_refcnt);
706 ip6_mc_clear_src(mc);
707 spin_unlock_bh(&mc->mca_lock);
711 * deleted ifmcaddr6 manipulation
713 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
715 struct ifmcaddr6 *pmc;
717 /* this is an "ifmcaddr6" for convenience; only the fields below
718 * are actually used. In particular, the refcnt and users are not
719 * used for management of the delete list. Using the same structure
720 * for deleted items allows change reports to use common code with
721 * non-deleted or query-response MCA's.
723 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
727 spin_lock_bh(&im->mca_lock);
728 spin_lock_init(&pmc->mca_lock);
729 pmc->idev = im->idev;
731 pmc->mca_addr = im->mca_addr;
732 pmc->mca_crcount = idev->mc_qrv;
733 pmc->mca_sfmode = im->mca_sfmode;
734 if (pmc->mca_sfmode == MCAST_INCLUDE) {
735 struct ip6_sf_list *psf;
737 pmc->mca_tomb = im->mca_tomb;
738 pmc->mca_sources = im->mca_sources;
739 im->mca_tomb = im->mca_sources = NULL;
740 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
741 psf->sf_crcount = pmc->mca_crcount;
743 spin_unlock_bh(&im->mca_lock);
745 spin_lock_bh(&idev->mc_lock);
746 pmc->next = idev->mc_tomb;
748 spin_unlock_bh(&idev->mc_lock);
751 static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
753 struct ifmcaddr6 *pmc, *pmc_prev;
754 struct ip6_sf_list *psf, *psf_next;
756 spin_lock_bh(&idev->mc_lock);
758 for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
759 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
765 pmc_prev->next = pmc->next;
767 idev->mc_tomb = pmc->next;
769 spin_unlock_bh(&idev->mc_lock);
772 for (psf = pmc->mca_tomb; psf; psf = psf_next) {
773 psf_next = psf->sf_next;
776 in6_dev_put(pmc->idev);
781 static void mld_clear_delrec(struct inet6_dev *idev)
783 struct ifmcaddr6 *pmc, *nextpmc;
785 spin_lock_bh(&idev->mc_lock);
787 idev->mc_tomb = NULL;
788 spin_unlock_bh(&idev->mc_lock);
790 for (; pmc; pmc = nextpmc) {
792 ip6_mc_clear_src(pmc);
793 in6_dev_put(pmc->idev);
797 /* clear dead sources, too */
798 read_lock_bh(&idev->lock);
799 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
800 struct ip6_sf_list *psf, *psf_next;
802 spin_lock_bh(&pmc->mca_lock);
804 pmc->mca_tomb = NULL;
805 spin_unlock_bh(&pmc->mca_lock);
806 for (; psf; psf = psf_next) {
807 psf_next = psf->sf_next;
811 read_unlock_bh(&idev->lock);
814 static void mca_get(struct ifmcaddr6 *mc)
816 atomic_inc(&mc->mca_refcnt);
819 static void ma_put(struct ifmcaddr6 *mc)
821 if (atomic_dec_and_test(&mc->mca_refcnt)) {
822 in6_dev_put(mc->idev);
827 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
828 const struct in6_addr *addr)
830 struct ifmcaddr6 *mc;
832 mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
836 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
838 mc->mca_addr = *addr;
839 mc->idev = idev; /* reference taken by caller */
841 /* mca_stamp should be updated upon changes */
842 mc->mca_cstamp = mc->mca_tstamp = jiffies;
843 atomic_set(&mc->mca_refcnt, 1);
844 spin_lock_init(&mc->mca_lock);
846 /* initial mode is (EX, empty) */
847 mc->mca_sfmode = MCAST_EXCLUDE;
848 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
850 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
851 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
852 mc->mca_flags |= MAF_NOREPORT;
858 * device multicast group inc (add if not found)
860 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
862 struct ifmcaddr6 *mc;
863 struct inet6_dev *idev;
867 /* we need to take a reference on idev */
868 idev = in6_dev_get(dev);
873 write_lock_bh(&idev->lock);
875 write_unlock_bh(&idev->lock);
880 for (mc = idev->mc_list; mc; mc = mc->next) {
881 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
883 write_unlock_bh(&idev->lock);
884 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
891 mc = mca_alloc(idev, addr);
893 write_unlock_bh(&idev->lock);
898 mc->next = idev->mc_list;
901 /* Hold this for the code below before we unlock,
902 * it is already exposed via idev->mc_list.
905 write_unlock_bh(&idev->lock);
907 mld_del_delrec(idev, &mc->mca_addr);
908 igmp6_group_added(mc);
914 * device multicast group del
916 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
918 struct ifmcaddr6 *ma, **map;
922 write_lock_bh(&idev->lock);
923 for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
924 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
925 if (--ma->mca_users == 0) {
927 write_unlock_bh(&idev->lock);
929 igmp6_group_dropped(ma);
934 write_unlock_bh(&idev->lock);
938 write_unlock_bh(&idev->lock);
943 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
945 struct inet6_dev *idev;
950 idev = __in6_dev_get(dev);
954 err = __ipv6_dev_mc_dec(idev, addr);
960 * check if the interface/address pair is valid
962 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
963 const struct in6_addr *src_addr)
965 struct inet6_dev *idev;
966 struct ifmcaddr6 *mc;
970 idev = __in6_dev_get(dev);
972 read_lock_bh(&idev->lock);
973 for (mc = idev->mc_list; mc; mc = mc->next) {
974 if (ipv6_addr_equal(&mc->mca_addr, group))
978 if (src_addr && !ipv6_addr_any(src_addr)) {
979 struct ip6_sf_list *psf;
981 spin_lock_bh(&mc->mca_lock);
982 for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
983 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
987 rv = psf->sf_count[MCAST_INCLUDE] ||
988 psf->sf_count[MCAST_EXCLUDE] !=
989 mc->mca_sfcount[MCAST_EXCLUDE];
991 rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
992 spin_unlock_bh(&mc->mca_lock);
994 rv = true; /* don't filter unspecified source */
996 read_unlock_bh(&idev->lock);
1002 static void mld_gq_start_timer(struct inet6_dev *idev)
1004 unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1006 idev->mc_gq_running = 1;
1007 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1011 static void mld_gq_stop_timer(struct inet6_dev *idev)
1013 idev->mc_gq_running = 0;
1014 if (del_timer(&idev->mc_gq_timer))
1015 __in6_dev_put(idev);
1018 static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1020 unsigned long tv = prandom_u32() % delay;
1022 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1026 static void mld_ifc_stop_timer(struct inet6_dev *idev)
1028 idev->mc_ifc_count = 0;
1029 if (del_timer(&idev->mc_ifc_timer))
1030 __in6_dev_put(idev);
1033 static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1035 unsigned long tv = prandom_u32() % delay;
1037 if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1041 static void mld_dad_stop_timer(struct inet6_dev *idev)
1043 if (del_timer(&idev->mc_dad_timer))
1044 __in6_dev_put(idev);
1048 * IGMP handling (alias multicast ICMPv6 messages)
1051 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1053 unsigned long delay = resptime;
1055 /* Do not start timer for these addresses */
1056 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1057 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1060 if (del_timer(&ma->mca_timer)) {
1061 atomic_dec(&ma->mca_refcnt);
1062 delay = ma->mca_timer.expires - jiffies;
1065 if (delay >= resptime)
1066 delay = prandom_u32() % resptime;
1068 ma->mca_timer.expires = jiffies + delay;
1069 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1070 atomic_inc(&ma->mca_refcnt);
1071 ma->mca_flags |= MAF_TIMER_RUNNING;
1074 /* mark EXCLUDE-mode sources */
1075 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1076 const struct in6_addr *srcs)
1078 struct ip6_sf_list *psf;
1082 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1083 if (scount == nsrcs)
1085 for (i = 0; i < nsrcs; i++) {
1086 /* skip inactive filters */
1087 if (psf->sf_count[MCAST_INCLUDE] ||
1088 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1089 psf->sf_count[MCAST_EXCLUDE])
1091 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1097 pmc->mca_flags &= ~MAF_GSQUERY;
1098 if (scount == nsrcs) /* all sources excluded */
1103 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1104 const struct in6_addr *srcs)
1106 struct ip6_sf_list *psf;
1109 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1110 return mld_xmarksources(pmc, nsrcs, srcs);
1112 /* mark INCLUDE-mode sources */
1115 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1116 if (scount == nsrcs)
1118 for (i = 0; i < nsrcs; i++) {
1119 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1127 pmc->mca_flags &= ~MAF_GSQUERY;
1130 pmc->mca_flags |= MAF_GSQUERY;
1134 static int mld_force_mld_version(const struct inet6_dev *idev)
1136 /* Normally, both are 0 here. If enforcement to a particular is
1137 * being used, individual device enforcement will have a lower
1138 * precedence over 'all' device (.../conf/all/force_mld_version).
1141 if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1142 return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1144 return idev->cnf.force_mld_version;
1147 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1149 return mld_force_mld_version(idev) == 2;
1152 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1154 return mld_force_mld_version(idev) == 1;
1157 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1159 if (mld_in_v2_mode_only(idev))
1161 if (mld_in_v1_mode_only(idev))
1163 if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1169 static void mld_set_v1_mode(struct inet6_dev *idev)
1171 /* RFC3810, relevant sections:
1172 * - 9.1. Robustness Variable
1173 * - 9.2. Query Interval
1174 * - 9.3. Query Response Interval
1175 * - 9.12. Older Version Querier Present Timeout
1177 unsigned long switchback;
1179 switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1181 idev->mc_v1_seen = jiffies + switchback;
1184 static void mld_update_qrv(struct inet6_dev *idev,
1185 const struct mld2_query *mlh2)
1187 /* RFC3810, relevant sections:
1188 * - 5.1.8. QRV (Querier's Robustness Variable)
1189 * - 9.1. Robustness Variable
1192 /* The value of the Robustness Variable MUST NOT be zero,
1193 * and SHOULD NOT be one. Catch this here if we ever run
1194 * into such a case in future.
1196 const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1197 WARN_ON(idev->mc_qrv == 0);
1199 if (mlh2->mld2q_qrv > 0)
1200 idev->mc_qrv = mlh2->mld2q_qrv;
1202 if (unlikely(idev->mc_qrv < min_qrv)) {
1203 net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1204 idev->mc_qrv, min_qrv);
1205 idev->mc_qrv = min_qrv;
1209 static void mld_update_qi(struct inet6_dev *idev,
1210 const struct mld2_query *mlh2)
1212 /* RFC3810, relevant sections:
1213 * - 5.1.9. QQIC (Querier's Query Interval Code)
1214 * - 9.2. Query Interval
1215 * - 9.12. Older Version Querier Present Timeout
1216 * (the [Query Interval] in the last Query received)
1218 unsigned long mc_qqi;
1220 if (mlh2->mld2q_qqic < 128) {
1221 mc_qqi = mlh2->mld2q_qqic;
1223 unsigned long mc_man, mc_exp;
1225 mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1226 mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1228 mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1231 idev->mc_qi = mc_qqi * HZ;
1234 static void mld_update_qri(struct inet6_dev *idev,
1235 const struct mld2_query *mlh2)
1237 /* RFC3810, relevant sections:
1238 * - 5.1.3. Maximum Response Code
1239 * - 9.3. Query Response Interval
1241 idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1244 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1245 unsigned long *max_delay, bool v1_query)
1247 unsigned long mldv1_md;
1249 /* Ignore v1 queries */
1250 if (mld_in_v2_mode_only(idev))
1253 mldv1_md = ntohs(mld->mld_maxdelay);
1255 /* When in MLDv1 fallback and a MLDv2 router start-up being
1256 * unaware of current MLDv1 operation, the MRC == MRD mapping
1257 * only works when the exponential algorithm is not being
1258 * used (as MLDv1 is unaware of such things).
1260 * According to the RFC author, the MLDv2 implementations
1261 * he's aware of all use a MRC < 32768 on start up queries.
1263 * Thus, should we *ever* encounter something else larger
1264 * than that, just assume the maximum possible within our
1268 mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1270 *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1272 /* MLDv1 router present: we need to go into v1 mode *only*
1273 * when an MLDv1 query is received as per section 9.12. of
1274 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1275 * queries MUST be of exactly 24 octets.
1278 mld_set_v1_mode(idev);
1280 /* cancel MLDv2 report timer */
1281 mld_gq_stop_timer(idev);
1282 /* cancel the interface change timer */
1283 mld_ifc_stop_timer(idev);
1284 /* clear deleted report items */
1285 mld_clear_delrec(idev);
1290 static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1291 unsigned long *max_delay)
1293 *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1295 mld_update_qrv(idev, mld);
1296 mld_update_qi(idev, mld);
1297 mld_update_qri(idev, mld);
1299 idev->mc_maxdelay = *max_delay;
1304 /* called with rcu_read_lock() */
1305 int igmp6_event_query(struct sk_buff *skb)
1307 struct mld2_query *mlh2 = NULL;
1308 struct ifmcaddr6 *ma;
1309 const struct in6_addr *group;
1310 unsigned long max_delay;
1311 struct inet6_dev *idev;
1312 struct mld_msg *mld;
1317 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1320 /* compute payload length excluding extension headers */
1321 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1322 len -= skb_network_header_len(skb);
1325 * Upon reception of an MLD message that contains a Query, the node
1326 * checks if the source address of the message is a valid link-local
1327 * address, if the Hop Limit is set to 1, and if the Router Alert
1328 * option is present in the Hop-By-Hop Options header of the IPv6
1329 * packet. If any of these checks fails, the packet is dropped.
1331 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1332 ipv6_hdr(skb)->hop_limit != 1 ||
1333 !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1334 IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1337 idev = __in6_dev_get(skb->dev);
1341 mld = (struct mld_msg *)icmp6_hdr(skb);
1342 group = &mld->mld_mca;
1343 group_type = ipv6_addr_type(group);
1345 if (group_type != IPV6_ADDR_ANY &&
1346 !(group_type&IPV6_ADDR_MULTICAST))
1349 if (len < MLD_V1_QUERY_LEN) {
1351 } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1352 err = mld_process_v1(idev, mld, &max_delay,
1353 len == MLD_V1_QUERY_LEN);
1356 } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1357 int srcs_offset = sizeof(struct mld2_query) -
1358 sizeof(struct icmp6hdr);
1360 if (!pskb_may_pull(skb, srcs_offset))
1363 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1365 err = mld_process_v2(idev, mlh2, &max_delay);
1369 if (group_type == IPV6_ADDR_ANY) { /* general query */
1370 if (mlh2->mld2q_nsrcs)
1371 return -EINVAL; /* no sources allowed */
1373 mld_gq_start_timer(idev);
1376 /* mark sources to include, if group & source-specific */
1377 if (mlh2->mld2q_nsrcs != 0) {
1378 if (!pskb_may_pull(skb, srcs_offset +
1379 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1382 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1389 read_lock_bh(&idev->lock);
1390 if (group_type == IPV6_ADDR_ANY) {
1391 for (ma = idev->mc_list; ma; ma = ma->next) {
1392 spin_lock_bh(&ma->mca_lock);
1393 igmp6_group_queried(ma, max_delay);
1394 spin_unlock_bh(&ma->mca_lock);
1397 for (ma = idev->mc_list; ma; ma = ma->next) {
1398 if (!ipv6_addr_equal(group, &ma->mca_addr))
1400 spin_lock_bh(&ma->mca_lock);
1401 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1402 /* gsquery <- gsquery && mark */
1404 ma->mca_flags &= ~MAF_GSQUERY;
1406 /* gsquery <- mark */
1408 ma->mca_flags |= MAF_GSQUERY;
1410 ma->mca_flags &= ~MAF_GSQUERY;
1412 if (!(ma->mca_flags & MAF_GSQUERY) ||
1413 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1414 igmp6_group_queried(ma, max_delay);
1415 spin_unlock_bh(&ma->mca_lock);
1419 read_unlock_bh(&idev->lock);
1424 /* called with rcu_read_lock() */
1425 int igmp6_event_report(struct sk_buff *skb)
1427 struct ifmcaddr6 *ma;
1428 struct inet6_dev *idev;
1429 struct mld_msg *mld;
1432 /* Our own report looped back. Ignore it. */
1433 if (skb->pkt_type == PACKET_LOOPBACK)
1436 /* send our report if the MC router may not have heard this report */
1437 if (skb->pkt_type != PACKET_MULTICAST &&
1438 skb->pkt_type != PACKET_BROADCAST)
1441 if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1444 mld = (struct mld_msg *)icmp6_hdr(skb);
1446 /* Drop reports with not link local source */
1447 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1448 if (addr_type != IPV6_ADDR_ANY &&
1449 !(addr_type&IPV6_ADDR_LINKLOCAL))
1452 idev = __in6_dev_get(skb->dev);
1457 * Cancel the timer for this group
1460 read_lock_bh(&idev->lock);
1461 for (ma = idev->mc_list; ma; ma = ma->next) {
1462 if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1463 spin_lock(&ma->mca_lock);
1464 if (del_timer(&ma->mca_timer))
1465 atomic_dec(&ma->mca_refcnt);
1466 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1467 spin_unlock(&ma->mca_lock);
1471 read_unlock_bh(&idev->lock);
1475 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1476 int gdeleted, int sdeleted)
1479 case MLD2_MODE_IS_INCLUDE:
1480 case MLD2_MODE_IS_EXCLUDE:
1481 if (gdeleted || sdeleted)
1483 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1484 if (pmc->mca_sfmode == MCAST_INCLUDE)
1486 /* don't include if this source is excluded
1489 if (psf->sf_count[MCAST_INCLUDE])
1490 return type == MLD2_MODE_IS_INCLUDE;
1491 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1492 psf->sf_count[MCAST_EXCLUDE];
1495 case MLD2_CHANGE_TO_INCLUDE:
1496 if (gdeleted || sdeleted)
1498 return psf->sf_count[MCAST_INCLUDE] != 0;
1499 case MLD2_CHANGE_TO_EXCLUDE:
1500 if (gdeleted || sdeleted)
1502 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1503 psf->sf_count[MCAST_INCLUDE])
1505 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1506 psf->sf_count[MCAST_EXCLUDE];
1507 case MLD2_ALLOW_NEW_SOURCES:
1508 if (gdeleted || !psf->sf_crcount)
1510 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1511 case MLD2_BLOCK_OLD_SOURCES:
1512 if (pmc->mca_sfmode == MCAST_INCLUDE)
1513 return gdeleted || (psf->sf_crcount && sdeleted);
1514 return psf->sf_crcount && !gdeleted && !sdeleted;
1520 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1522 struct ip6_sf_list *psf;
1525 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1526 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1533 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1534 struct net_device *dev,
1535 const struct in6_addr *saddr,
1536 const struct in6_addr *daddr,
1539 struct ipv6hdr *hdr;
1541 skb->protocol = htons(ETH_P_IPV6);
1544 skb_reset_network_header(skb);
1545 skb_put(skb, sizeof(struct ipv6hdr));
1546 hdr = ipv6_hdr(skb);
1548 ip6_flow_hdr(hdr, 0, 0);
1550 hdr->payload_len = htons(len);
1551 hdr->nexthdr = proto;
1552 hdr->hop_limit = inet6_sk(sk)->hop_limit;
1554 hdr->saddr = *saddr;
1555 hdr->daddr = *daddr;
1558 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1560 struct net_device *dev = idev->dev;
1561 struct net *net = dev_net(dev);
1562 struct sock *sk = net->ipv6.igmp_sk;
1563 struct sk_buff *skb;
1564 struct mld2_report *pmr;
1565 struct in6_addr addr_buf;
1566 const struct in6_addr *saddr;
1567 int hlen = LL_RESERVED_SPACE(dev);
1568 int tlen = dev->needed_tailroom;
1569 unsigned int size = mtu + hlen + tlen;
1571 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1572 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1575 /* we assume size > sizeof(ra) here */
1576 skb = sock_alloc_send_skb(sk, size, 1, &err);
1580 skb->priority = TC_PRIO_CONTROL;
1581 skb_reserve(skb, hlen);
1582 skb_tailroom_reserve(skb, mtu, tlen);
1584 if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1585 /* <draft-ietf-magma-mld-source-05.txt>:
1586 * use unspecified address as the source address
1587 * when a valid link-local address is not available.
1589 saddr = &in6addr_any;
1593 ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1595 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1597 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1598 skb_put(skb, sizeof(*pmr));
1599 pmr = (struct mld2_report *)skb_transport_header(skb);
1600 pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1601 pmr->mld2r_resv1 = 0;
1602 pmr->mld2r_cksum = 0;
1603 pmr->mld2r_resv2 = 0;
1604 pmr->mld2r_ngrec = 0;
1608 static void mld_sendpack(struct sk_buff *skb)
1610 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1611 struct mld2_report *pmr =
1612 (struct mld2_report *)skb_transport_header(skb);
1613 int payload_len, mldlen;
1614 struct inet6_dev *idev;
1615 struct net *net = dev_net(skb->dev);
1618 struct dst_entry *dst;
1621 idev = __in6_dev_get(skb->dev);
1622 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1624 payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1626 mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1627 pip6->payload_len = htons(payload_len);
1629 pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1631 csum_partial(skb_transport_header(skb),
1634 icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1635 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1637 dst = icmp6_dst_alloc(skb->dev, &fl6);
1644 skb_dst_set(skb, dst);
1648 payload_len = skb->len;
1650 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1651 net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1655 ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1656 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1658 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1669 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1671 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1674 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1675 int type, struct mld2_grec **ppgr, unsigned int mtu)
1677 struct mld2_report *pmr;
1678 struct mld2_grec *pgr;
1681 skb = mld_newpack(pmc->idev, mtu);
1685 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1686 pgr->grec_type = type;
1687 pgr->grec_auxwords = 0;
1688 pgr->grec_nsrcs = 0;
1689 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1690 pmr = (struct mld2_report *)skb_transport_header(skb);
1691 pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1696 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
1698 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1699 int type, int gdeleted, int sdeleted, int crsend)
1701 struct inet6_dev *idev = pmc->idev;
1702 struct net_device *dev = idev->dev;
1703 struct mld2_report *pmr;
1704 struct mld2_grec *pgr = NULL;
1705 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1706 int scount, stotal, first, isquery, truncate;
1709 if (pmc->mca_flags & MAF_NOREPORT)
1712 mtu = READ_ONCE(dev->mtu);
1713 if (mtu < IPV6_MIN_MTU)
1716 isquery = type == MLD2_MODE_IS_INCLUDE ||
1717 type == MLD2_MODE_IS_EXCLUDE;
1718 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1719 type == MLD2_CHANGE_TO_EXCLUDE;
1721 stotal = scount = 0;
1723 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1728 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1730 /* EX and TO_EX get a fresh packet, if needed */
1732 if (pmr && pmr->mld2r_ngrec &&
1733 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1736 skb = mld_newpack(idev, mtu);
1741 for (psf = *psf_list; psf; psf = psf_next) {
1742 struct in6_addr *psrc;
1744 psf_next = psf->sf_next;
1746 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
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, mtu);
1768 skb = add_grhead(skb, pmc, type, &pgr, mtu);
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) {
1779 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1781 psf_prev->sf_next = psf->sf_next;
1783 *psf_list = psf->sf_next;
1793 if (type == MLD2_ALLOW_NEW_SOURCES ||
1794 type == MLD2_BLOCK_OLD_SOURCES)
1796 if (pmc->mca_crcount || isquery || crsend) {
1797 /* make sure we have room for group header */
1798 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1800 skb = NULL; /* add_grhead will get a new one */
1802 skb = add_grhead(skb, pmc, type, &pgr, mtu);
1806 pgr->grec_nsrcs = htons(scount);
1809 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1813 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1815 struct sk_buff *skb = NULL;
1818 read_lock_bh(&idev->lock);
1820 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1821 if (pmc->mca_flags & MAF_NOREPORT)
1823 spin_lock_bh(&pmc->mca_lock);
1824 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1825 type = MLD2_MODE_IS_EXCLUDE;
1827 type = MLD2_MODE_IS_INCLUDE;
1828 skb = add_grec(skb, pmc, type, 0, 0, 0);
1829 spin_unlock_bh(&pmc->mca_lock);
1832 spin_lock_bh(&pmc->mca_lock);
1833 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1834 type = MLD2_MODE_IS_EXCLUDE;
1836 type = MLD2_MODE_IS_INCLUDE;
1837 skb = add_grec(skb, pmc, type, 0, 0, 0);
1838 spin_unlock_bh(&pmc->mca_lock);
1840 read_unlock_bh(&idev->lock);
1846 * remove zero-count source records from a source filter list
1848 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1850 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1853 for (psf = *ppsf; psf; psf = psf_next) {
1854 psf_next = psf->sf_next;
1855 if (psf->sf_crcount == 0) {
1857 psf_prev->sf_next = psf->sf_next;
1859 *ppsf = psf->sf_next;
1866 static void mld_send_cr(struct inet6_dev *idev)
1868 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1869 struct sk_buff *skb = NULL;
1872 read_lock_bh(&idev->lock);
1873 spin_lock(&idev->mc_lock);
1877 for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1878 pmc_next = pmc->next;
1879 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1880 type = MLD2_BLOCK_OLD_SOURCES;
1881 dtype = MLD2_BLOCK_OLD_SOURCES;
1882 skb = add_grec(skb, pmc, type, 1, 0, 0);
1883 skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1885 if (pmc->mca_crcount) {
1886 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1887 type = MLD2_CHANGE_TO_INCLUDE;
1888 skb = add_grec(skb, pmc, type, 1, 0, 0);
1891 if (pmc->mca_crcount == 0) {
1892 mld_clear_zeros(&pmc->mca_tomb);
1893 mld_clear_zeros(&pmc->mca_sources);
1896 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1897 !pmc->mca_sources) {
1899 pmc_prev->next = pmc_next;
1901 idev->mc_tomb = pmc_next;
1902 in6_dev_put(pmc->idev);
1907 spin_unlock(&idev->mc_lock);
1910 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1911 spin_lock_bh(&pmc->mca_lock);
1912 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1913 type = MLD2_BLOCK_OLD_SOURCES;
1914 dtype = MLD2_ALLOW_NEW_SOURCES;
1916 type = MLD2_ALLOW_NEW_SOURCES;
1917 dtype = MLD2_BLOCK_OLD_SOURCES;
1919 skb = add_grec(skb, pmc, type, 0, 0, 0);
1920 skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* deleted sources */
1922 /* filter mode changes */
1923 if (pmc->mca_crcount) {
1924 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1925 type = MLD2_CHANGE_TO_EXCLUDE;
1927 type = MLD2_CHANGE_TO_INCLUDE;
1928 skb = add_grec(skb, pmc, type, 0, 0, 0);
1931 spin_unlock_bh(&pmc->mca_lock);
1933 read_unlock_bh(&idev->lock);
1936 (void) mld_sendpack(skb);
1939 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1941 struct net *net = dev_net(dev);
1942 struct sock *sk = net->ipv6.igmp_sk;
1943 struct inet6_dev *idev;
1944 struct sk_buff *skb;
1945 struct mld_msg *hdr;
1946 const struct in6_addr *snd_addr, *saddr;
1947 struct in6_addr addr_buf;
1948 int hlen = LL_RESERVED_SPACE(dev);
1949 int tlen = dev->needed_tailroom;
1950 int err, len, payload_len, full_len;
1951 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1952 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1955 struct dst_entry *dst;
1957 if (type == ICMPV6_MGM_REDUCTION)
1958 snd_addr = &in6addr_linklocal_allrouters;
1962 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1963 payload_len = len + sizeof(ra);
1964 full_len = sizeof(struct ipv6hdr) + payload_len;
1967 IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1968 IPSTATS_MIB_OUT, full_len);
1971 skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1975 IP6_INC_STATS(net, __in6_dev_get(dev),
1976 IPSTATS_MIB_OUTDISCARDS);
1980 skb->priority = TC_PRIO_CONTROL;
1981 skb_reserve(skb, hlen);
1983 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1984 /* <draft-ietf-magma-mld-source-05.txt>:
1985 * use unspecified address as the source address
1986 * when a valid link-local address is not available.
1988 saddr = &in6addr_any;
1992 ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1994 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1996 hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1997 memset(hdr, 0, sizeof(struct mld_msg));
1998 hdr->mld_type = type;
1999 hdr->mld_mca = *addr;
2001 hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2003 csum_partial(hdr, len, 0));
2006 idev = __in6_dev_get(skb->dev);
2008 icmpv6_flow_init(sk, &fl6, type,
2009 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2011 dst = icmp6_dst_alloc(skb->dev, &fl6);
2017 skb_dst_set(skb, dst);
2018 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2019 net, sk, skb, NULL, skb->dev,
2023 ICMP6MSGOUT_INC_STATS(net, idev, type);
2024 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2026 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2036 static void mld_send_initial_cr(struct inet6_dev *idev)
2038 struct sk_buff *skb;
2039 struct ifmcaddr6 *pmc;
2042 if (mld_in_v1_mode(idev))
2046 read_lock_bh(&idev->lock);
2047 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2048 spin_lock_bh(&pmc->mca_lock);
2049 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2050 type = MLD2_CHANGE_TO_EXCLUDE;
2052 type = MLD2_CHANGE_TO_INCLUDE;
2053 skb = add_grec(skb, pmc, type, 0, 0, 1);
2054 spin_unlock_bh(&pmc->mca_lock);
2056 read_unlock_bh(&idev->lock);
2061 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2063 idev->mc_dad_count = idev->mc_qrv;
2064 if (idev->mc_dad_count) {
2065 mld_send_initial_cr(idev);
2066 idev->mc_dad_count--;
2067 if (idev->mc_dad_count)
2068 mld_dad_start_timer(idev,
2069 unsolicited_report_interval(idev));
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,
2082 unsolicited_report_interval(idev));
2087 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2088 const struct in6_addr *psfsrc)
2090 struct ip6_sf_list *psf, *psf_prev;
2094 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2095 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2099 if (!psf || psf->sf_count[sfmode] == 0) {
2100 /* source filter not found, or count wrong => bug */
2103 psf->sf_count[sfmode]--;
2104 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2105 struct inet6_dev *idev = pmc->idev;
2107 /* no more filters for this source */
2109 psf_prev->sf_next = psf->sf_next;
2111 pmc->mca_sources = psf->sf_next;
2112 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2113 !mld_in_v1_mode(idev)) {
2114 psf->sf_crcount = idev->mc_qrv;
2115 psf->sf_next = pmc->mca_tomb;
2116 pmc->mca_tomb = psf;
2124 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2125 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2128 struct ifmcaddr6 *pmc;
2134 read_lock_bh(&idev->lock);
2135 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2136 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2140 /* MCA not found?? bug */
2141 read_unlock_bh(&idev->lock);
2144 spin_lock_bh(&pmc->mca_lock);
2147 if (!pmc->mca_sfcount[sfmode]) {
2148 spin_unlock_bh(&pmc->mca_lock);
2149 read_unlock_bh(&idev->lock);
2152 pmc->mca_sfcount[sfmode]--;
2155 for (i = 0; i < sfcount; i++) {
2156 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2158 changerec |= rv > 0;
2162 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2163 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2164 pmc->mca_sfcount[MCAST_INCLUDE]) {
2165 struct ip6_sf_list *psf;
2167 /* filter mode change */
2168 pmc->mca_sfmode = MCAST_INCLUDE;
2169 pmc->mca_crcount = idev->mc_qrv;
2170 idev->mc_ifc_count = pmc->mca_crcount;
2171 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2172 psf->sf_crcount = 0;
2173 mld_ifc_event(pmc->idev);
2174 } else if (sf_setstate(pmc) || changerec)
2175 mld_ifc_event(pmc->idev);
2176 spin_unlock_bh(&pmc->mca_lock);
2177 read_unlock_bh(&idev->lock);
2182 * Add multicast single-source filter to the interface list
2184 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2185 const struct in6_addr *psfsrc)
2187 struct ip6_sf_list *psf, *psf_prev;
2190 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2191 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2196 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2200 psf->sf_addr = *psfsrc;
2202 psf_prev->sf_next = psf;
2204 pmc->mca_sources = psf;
2206 psf->sf_count[sfmode]++;
2210 static void sf_markstate(struct ifmcaddr6 *pmc)
2212 struct ip6_sf_list *psf;
2213 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2215 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2216 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2217 psf->sf_oldin = mca_xcount ==
2218 psf->sf_count[MCAST_EXCLUDE] &&
2219 !psf->sf_count[MCAST_INCLUDE];
2221 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2224 static int sf_setstate(struct ifmcaddr6 *pmc)
2226 struct ip6_sf_list *psf, *dpsf;
2227 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2228 int qrv = pmc->idev->mc_qrv;
2232 for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2233 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2234 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2235 !psf->sf_count[MCAST_INCLUDE];
2237 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2239 if (!psf->sf_oldin) {
2240 struct ip6_sf_list *prev = NULL;
2242 for (dpsf = pmc->mca_tomb; dpsf;
2243 dpsf = dpsf->sf_next) {
2244 if (ipv6_addr_equal(&dpsf->sf_addr,
2251 prev->sf_next = dpsf->sf_next;
2253 pmc->mca_tomb = dpsf->sf_next;
2256 psf->sf_crcount = qrv;
2259 } else if (psf->sf_oldin) {
2260 psf->sf_crcount = 0;
2262 * add or update "delete" records if an active filter
2265 for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2266 if (ipv6_addr_equal(&dpsf->sf_addr,
2270 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2274 /* pmc->mca_lock held by callers */
2275 dpsf->sf_next = pmc->mca_tomb;
2276 pmc->mca_tomb = dpsf;
2278 dpsf->sf_crcount = qrv;
2286 * Add multicast source filter list to the interface list
2288 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2289 int sfmode, int sfcount, const struct in6_addr *psfsrc,
2292 struct ifmcaddr6 *pmc;
2298 read_lock_bh(&idev->lock);
2299 for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2300 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2304 /* MCA not found?? bug */
2305 read_unlock_bh(&idev->lock);
2308 spin_lock_bh(&pmc->mca_lock);
2311 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2313 pmc->mca_sfcount[sfmode]++;
2315 for (i = 0; i < sfcount; i++) {
2316 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2324 pmc->mca_sfcount[sfmode]--;
2325 for (j = 0; j < i; j++)
2326 ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2327 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2328 struct ip6_sf_list *psf;
2330 /* filter mode change */
2331 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2332 pmc->mca_sfmode = MCAST_EXCLUDE;
2333 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2334 pmc->mca_sfmode = MCAST_INCLUDE;
2335 /* else no filters; keep old mode for reports */
2337 pmc->mca_crcount = idev->mc_qrv;
2338 idev->mc_ifc_count = pmc->mca_crcount;
2339 for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2340 psf->sf_crcount = 0;
2341 mld_ifc_event(idev);
2342 } else if (sf_setstate(pmc))
2343 mld_ifc_event(idev);
2344 spin_unlock_bh(&pmc->mca_lock);
2345 read_unlock_bh(&idev->lock);
2349 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2351 struct ip6_sf_list *psf, *nextpsf;
2353 for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2354 nextpsf = psf->sf_next;
2357 pmc->mca_tomb = NULL;
2358 for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2359 nextpsf = psf->sf_next;
2362 pmc->mca_sources = NULL;
2363 pmc->mca_sfmode = MCAST_EXCLUDE;
2364 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2365 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2369 static void igmp6_join_group(struct ifmcaddr6 *ma)
2371 unsigned long delay;
2373 if (ma->mca_flags & MAF_NOREPORT)
2376 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2378 delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2380 spin_lock_bh(&ma->mca_lock);
2381 if (del_timer(&ma->mca_timer)) {
2382 atomic_dec(&ma->mca_refcnt);
2383 delay = ma->mca_timer.expires - jiffies;
2386 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2387 atomic_inc(&ma->mca_refcnt);
2388 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2389 spin_unlock_bh(&ma->mca_lock);
2392 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2393 struct inet6_dev *idev)
2397 write_lock_bh(&iml->sflock);
2399 /* any-source empty exclude case */
2400 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2402 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2403 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2404 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2407 write_unlock_bh(&iml->sflock);
2411 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2413 if (mld_in_v1_mode(ma->idev)) {
2414 if (ma->mca_flags & MAF_LAST_REPORTER)
2415 igmp6_send(&ma->mca_addr, ma->idev->dev,
2416 ICMPV6_MGM_REDUCTION);
2418 mld_add_delrec(ma->idev, ma);
2419 mld_ifc_event(ma->idev);
2423 static void mld_gq_timer_expire(unsigned long data)
2425 struct inet6_dev *idev = (struct inet6_dev *)data;
2427 idev->mc_gq_running = 0;
2428 mld_send_report(idev, NULL);
2432 static void mld_ifc_timer_expire(unsigned long data)
2434 struct inet6_dev *idev = (struct inet6_dev *)data;
2437 if (idev->mc_ifc_count) {
2438 idev->mc_ifc_count--;
2439 if (idev->mc_ifc_count)
2440 mld_ifc_start_timer(idev,
2441 unsolicited_report_interval(idev));
2446 static void mld_ifc_event(struct inet6_dev *idev)
2448 if (mld_in_v1_mode(idev))
2450 idev->mc_ifc_count = idev->mc_qrv;
2451 mld_ifc_start_timer(idev, 1);
2455 static void igmp6_timer_handler(unsigned long data)
2457 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2459 if (mld_in_v1_mode(ma->idev))
2460 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2462 mld_send_report(ma->idev, ma);
2464 spin_lock(&ma->mca_lock);
2465 ma->mca_flags |= MAF_LAST_REPORTER;
2466 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2467 spin_unlock(&ma->mca_lock);
2471 /* Device changing type */
2473 void ipv6_mc_unmap(struct inet6_dev *idev)
2475 struct ifmcaddr6 *i;
2477 /* Install multicast list, except for all-nodes (already installed) */
2479 read_lock_bh(&idev->lock);
2480 for (i = idev->mc_list; i; i = i->next)
2481 igmp6_group_dropped(i);
2482 read_unlock_bh(&idev->lock);
2485 void ipv6_mc_remap(struct inet6_dev *idev)
2490 /* Device going down */
2492 void ipv6_mc_down(struct inet6_dev *idev)
2494 struct ifmcaddr6 *i;
2496 /* Withdraw multicast list */
2498 read_lock_bh(&idev->lock);
2499 mld_ifc_stop_timer(idev);
2500 mld_gq_stop_timer(idev);
2501 mld_dad_stop_timer(idev);
2503 for (i = idev->mc_list; i; i = i->next)
2504 igmp6_group_dropped(i);
2505 read_unlock_bh(&idev->lock);
2507 mld_clear_delrec(idev);
2510 static void ipv6_mc_reset(struct inet6_dev *idev)
2512 idev->mc_qrv = sysctl_mld_qrv;
2513 idev->mc_qi = MLD_QI_DEFAULT;
2514 idev->mc_qri = MLD_QRI_DEFAULT;
2515 idev->mc_v1_seen = 0;
2516 idev->mc_maxdelay = unsolicited_report_interval(idev);
2519 /* Device going up */
2521 void ipv6_mc_up(struct inet6_dev *idev)
2523 struct ifmcaddr6 *i;
2525 /* Install multicast list, except for all-nodes (already installed) */
2527 read_lock_bh(&idev->lock);
2528 ipv6_mc_reset(idev);
2529 for (i = idev->mc_list; i; i = i->next)
2530 igmp6_group_added(i);
2531 read_unlock_bh(&idev->lock);
2534 /* IPv6 device initialization. */
2536 void ipv6_mc_init_dev(struct inet6_dev *idev)
2538 write_lock_bh(&idev->lock);
2539 spin_lock_init(&idev->mc_lock);
2540 idev->mc_gq_running = 0;
2541 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2542 (unsigned long)idev);
2543 idev->mc_tomb = NULL;
2544 idev->mc_ifc_count = 0;
2545 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2546 (unsigned long)idev);
2547 setup_timer(&idev->mc_dad_timer, mld_dad_timer_expire,
2548 (unsigned long)idev);
2549 ipv6_mc_reset(idev);
2550 write_unlock_bh(&idev->lock);
2554 * Device is about to be destroyed: clean up.
2557 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2559 struct ifmcaddr6 *i;
2561 /* Deactivate timers */
2564 /* Delete all-nodes address. */
2565 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2566 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2569 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2571 if (idev->cnf.forwarding)
2572 __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2574 write_lock_bh(&idev->lock);
2575 while ((i = idev->mc_list) != NULL) {
2576 idev->mc_list = i->next;
2577 write_unlock_bh(&idev->lock);
2579 igmp6_group_dropped(i);
2580 ip6_mc_clear_src(i);
2583 write_lock_bh(&idev->lock);
2585 write_unlock_bh(&idev->lock);
2588 #ifdef CONFIG_PROC_FS
2589 struct igmp6_mc_iter_state {
2590 struct seq_net_private p;
2591 struct net_device *dev;
2592 struct inet6_dev *idev;
2595 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2597 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2599 struct ifmcaddr6 *im = NULL;
2600 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2601 struct net *net = seq_file_net(seq);
2604 for_each_netdev_rcu(net, state->dev) {
2605 struct inet6_dev *idev;
2606 idev = __in6_dev_get(state->dev);
2609 read_lock_bh(&idev->lock);
2615 read_unlock_bh(&idev->lock);
2620 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2622 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2626 if (likely(state->idev))
2627 read_unlock_bh(&state->idev->lock);
2629 state->dev = next_net_device_rcu(state->dev);
2634 state->idev = __in6_dev_get(state->dev);
2637 read_lock_bh(&state->idev->lock);
2638 im = state->idev->mc_list;
2643 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2645 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2647 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2649 return pos ? NULL : im;
2652 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2656 return igmp6_mc_get_idx(seq, *pos);
2659 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2661 struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2667 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2670 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2672 if (likely(state->idev)) {
2673 read_unlock_bh(&state->idev->lock);
2680 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2682 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2683 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2686 "%-4d %-15s %pi6 %5d %08X %ld\n",
2687 state->dev->ifindex, state->dev->name,
2689 im->mca_users, im->mca_flags,
2690 (im->mca_flags&MAF_TIMER_RUNNING) ?
2691 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2695 static const struct seq_operations igmp6_mc_seq_ops = {
2696 .start = igmp6_mc_seq_start,
2697 .next = igmp6_mc_seq_next,
2698 .stop = igmp6_mc_seq_stop,
2699 .show = igmp6_mc_seq_show,
2702 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2704 return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2705 sizeof(struct igmp6_mc_iter_state));
2708 static const struct file_operations igmp6_mc_seq_fops = {
2709 .owner = THIS_MODULE,
2710 .open = igmp6_mc_seq_open,
2712 .llseek = seq_lseek,
2713 .release = seq_release_net,
2716 struct igmp6_mcf_iter_state {
2717 struct seq_net_private p;
2718 struct net_device *dev;
2719 struct inet6_dev *idev;
2720 struct ifmcaddr6 *im;
2723 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2725 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2727 struct ip6_sf_list *psf = NULL;
2728 struct ifmcaddr6 *im = NULL;
2729 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2730 struct net *net = seq_file_net(seq);
2734 for_each_netdev_rcu(net, state->dev) {
2735 struct inet6_dev *idev;
2736 idev = __in6_dev_get(state->dev);
2737 if (unlikely(idev == NULL))
2739 read_lock_bh(&idev->lock);
2742 spin_lock_bh(&im->mca_lock);
2743 psf = im->mca_sources;
2749 spin_unlock_bh(&im->mca_lock);
2751 read_unlock_bh(&idev->lock);
2756 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2758 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2762 spin_unlock_bh(&state->im->mca_lock);
2763 state->im = state->im->next;
2764 while (!state->im) {
2765 if (likely(state->idev))
2766 read_unlock_bh(&state->idev->lock);
2768 state->dev = next_net_device_rcu(state->dev);
2773 state->idev = __in6_dev_get(state->dev);
2776 read_lock_bh(&state->idev->lock);
2777 state->im = state->idev->mc_list;
2781 spin_lock_bh(&state->im->mca_lock);
2782 psf = state->im->mca_sources;
2788 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2790 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2792 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2794 return pos ? NULL : psf;
2797 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2801 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2804 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2806 struct ip6_sf_list *psf;
2807 if (v == SEQ_START_TOKEN)
2808 psf = igmp6_mcf_get_first(seq);
2810 psf = igmp6_mcf_get_next(seq, v);
2815 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2818 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2819 if (likely(state->im)) {
2820 spin_unlock_bh(&state->im->mca_lock);
2823 if (likely(state->idev)) {
2824 read_unlock_bh(&state->idev->lock);
2831 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2833 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2834 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2836 if (v == SEQ_START_TOKEN) {
2837 seq_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n");
2840 "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2841 state->dev->ifindex, state->dev->name,
2842 &state->im->mca_addr,
2844 psf->sf_count[MCAST_INCLUDE],
2845 psf->sf_count[MCAST_EXCLUDE]);
2850 static const struct seq_operations igmp6_mcf_seq_ops = {
2851 .start = igmp6_mcf_seq_start,
2852 .next = igmp6_mcf_seq_next,
2853 .stop = igmp6_mcf_seq_stop,
2854 .show = igmp6_mcf_seq_show,
2857 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2859 return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2860 sizeof(struct igmp6_mcf_iter_state));
2863 static const struct file_operations igmp6_mcf_seq_fops = {
2864 .owner = THIS_MODULE,
2865 .open = igmp6_mcf_seq_open,
2867 .llseek = seq_lseek,
2868 .release = seq_release_net,
2871 static int __net_init igmp6_proc_init(struct net *net)
2876 if (!proc_create("igmp6", S_IRUGO, net->proc_net, &igmp6_mc_seq_fops))
2878 if (!proc_create("mcfilter6", S_IRUGO, net->proc_net,
2879 &igmp6_mcf_seq_fops))
2880 goto out_proc_net_igmp6;
2887 remove_proc_entry("igmp6", net->proc_net);
2891 static void __net_exit igmp6_proc_exit(struct net *net)
2893 remove_proc_entry("mcfilter6", net->proc_net);
2894 remove_proc_entry("igmp6", net->proc_net);
2897 static inline int igmp6_proc_init(struct net *net)
2901 static inline void igmp6_proc_exit(struct net *net)
2906 static int __net_init igmp6_net_init(struct net *net)
2910 err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2911 SOCK_RAW, IPPROTO_ICMPV6, net);
2913 pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2918 inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2920 err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2921 SOCK_RAW, IPPROTO_ICMPV6, net);
2923 pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2925 goto out_sock_create;
2928 err = igmp6_proc_init(net);
2930 goto out_sock_create_autojoin;
2934 out_sock_create_autojoin:
2935 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2937 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2942 static void __net_exit igmp6_net_exit(struct net *net)
2944 inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2945 inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2946 igmp6_proc_exit(net);
2949 static struct pernet_operations igmp6_net_ops = {
2950 .init = igmp6_net_init,
2951 .exit = igmp6_net_exit,
2954 int __init igmp6_init(void)
2956 return register_pernet_subsys(&igmp6_net_ops);
2959 void igmp6_cleanup(void)
2961 unregister_pernet_subsys(&igmp6_net_ops);