2 * Multicast support for IPv6
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
10 * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
20 * yoshfuji : fix format of router-alert option
21 * YOSHIFUJI Hideaki @USAGI:
22 * Fixed source address for MLD message based on
23 * <draft-ietf-magma-mld-source-05.txt>.
24 * YOSHIFUJI Hideaki @USAGI:
25 * - Ignore Queries for invalid addresses.
26 * - MLD for link-local addresses.
27 * David L Stevens <dlstevens@us.ibm.com>:
31 #include <linux/module.h>
32 #include <linux/errno.h>
33 #include <linux/types.h>
34 #include <linux/string.h>
35 #include <linux/socket.h>
36 #include <linux/sockios.h>
37 #include <linux/jiffies.h>
38 #include <linux/times.h>
39 #include <linux/net.h>
41 #include <linux/in6.h>
42 #include <linux/netdevice.h>
43 #include <linux/if_arp.h>
44 #include <linux/route.h>
45 #include <linux/init.h>
46 #include <linux/proc_fs.h>
47 #include <linux/seq_file.h>
49 #include <linux/netfilter.h>
50 #include <linux/netfilter_ipv6.h>
52 #include <net/net_namespace.h>
57 #include <net/protocol.h>
58 #include <net/if_inet6.h>
59 #include <net/ndisc.h>
60 #include <net/addrconf.h>
61 #include <net/ip6_route.h>
63 #include <net/ip6_checksum.h>
65 /* Set to 3 to get tracing... */
69 #define MDBG(x) printk x
75 * These header formats should be in a separate include file, but icmpv6.h
76 * doesn't have in6_addr defined in all cases, there is no __u128, and no
77 * other files reference these.
82 /* Multicast Listener Discovery version 2 headers */
88 struct in6_addr grec_mca;
89 struct in6_addr grec_src[0];
98 struct mld2_grec grec[0];
108 #if defined(__LITTLE_ENDIAN_BITFIELD)
112 #elif defined(__BIG_ENDIAN_BITFIELD)
117 #error "Please fix <asm/byteorder.h>"
121 struct in6_addr srcs[0];
124 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
126 /* Big mc list lock for all the sockets */
127 static DEFINE_RWLOCK(ipv6_sk_mc_lock);
129 static struct socket *igmp6_socket;
131 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
133 static void igmp6_join_group(struct ifmcaddr6 *ma);
134 static void igmp6_leave_group(struct ifmcaddr6 *ma);
135 static void igmp6_timer_handler(unsigned long data);
137 static void mld_gq_timer_expire(unsigned long data);
138 static void mld_ifc_timer_expire(unsigned long data);
139 static void mld_ifc_event(struct inet6_dev *idev);
140 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
141 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
142 static void mld_clear_delrec(struct inet6_dev *idev);
143 static int sf_setstate(struct ifmcaddr6 *pmc);
144 static void sf_markstate(struct ifmcaddr6 *pmc);
145 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
146 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
147 int sfmode, int sfcount, struct in6_addr *psfsrc,
149 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
150 int sfmode, int sfcount, struct in6_addr *psfsrc,
152 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
153 struct inet6_dev *idev);
156 #define IGMP6_UNSOLICITED_IVAL (10*HZ)
157 #define MLD_QRV_DEFAULT 2
159 #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
160 (idev)->cnf.force_mld_version == 1 || \
161 ((idev)->mc_v1_seen && \
162 time_before(jiffies, (idev)->mc_v1_seen)))
164 #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
165 #define MLDV2_EXP(thresh, nbmant, nbexp, value) \
166 ((value) < (thresh) ? (value) : \
167 ((MLDV2_MASK(value, nbmant) | (1<<(nbmant))) << \
168 (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
170 #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
171 #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
173 #define IPV6_MLD_MAX_MSF 64
175 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
178 * socket join on multicast group
181 int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
183 struct net_device *dev = NULL;
184 struct ipv6_mc_socklist *mc_lst;
185 struct ipv6_pinfo *np = inet6_sk(sk);
188 if (!ipv6_addr_is_multicast(addr))
191 read_lock_bh(&ipv6_sk_mc_lock);
192 for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
193 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
194 ipv6_addr_equal(&mc_lst->addr, addr)) {
195 read_unlock_bh(&ipv6_sk_mc_lock);
199 read_unlock_bh(&ipv6_sk_mc_lock);
201 mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
207 ipv6_addr_copy(&mc_lst->addr, addr);
211 rt = rt6_lookup(addr, NULL, 0, 0);
215 dst_release(&rt->u.dst);
218 dev = dev_get_by_index(&init_net, ifindex);
221 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
225 mc_lst->ifindex = dev->ifindex;
226 mc_lst->sfmode = MCAST_EXCLUDE;
227 rwlock_init(&mc_lst->sflock);
228 mc_lst->sflist = NULL;
231 * now add/increase the group membership on the device
234 err = ipv6_dev_mc_inc(dev, addr);
237 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
242 write_lock_bh(&ipv6_sk_mc_lock);
243 mc_lst->next = np->ipv6_mc_list;
244 np->ipv6_mc_list = mc_lst;
245 write_unlock_bh(&ipv6_sk_mc_lock);
253 * socket leave on multicast group
255 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
257 struct ipv6_pinfo *np = inet6_sk(sk);
258 struct ipv6_mc_socklist *mc_lst, **lnk;
260 write_lock_bh(&ipv6_sk_mc_lock);
261 for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
262 if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
263 ipv6_addr_equal(&mc_lst->addr, addr)) {
264 struct net_device *dev;
267 write_unlock_bh(&ipv6_sk_mc_lock);
269 if ((dev = dev_get_by_index(&init_net, mc_lst->ifindex)) != NULL) {
270 struct inet6_dev *idev = in6_dev_get(dev);
272 (void) ip6_mc_leave_src(sk, mc_lst, idev);
274 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
279 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
280 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
284 write_unlock_bh(&ipv6_sk_mc_lock);
286 return -EADDRNOTAVAIL;
289 static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
291 struct net_device *dev = NULL;
292 struct inet6_dev *idev = NULL;
297 rt = rt6_lookup(group, NULL, 0, 0);
301 dst_release(&rt->u.dst);
304 dev = dev_get_by_index(&init_net, ifindex);
308 idev = in6_dev_get(dev);
313 read_lock_bh(&idev->lock);
315 read_unlock_bh(&idev->lock);
323 void ipv6_sock_mc_close(struct sock *sk)
325 struct ipv6_pinfo *np = inet6_sk(sk);
326 struct ipv6_mc_socklist *mc_lst;
328 write_lock_bh(&ipv6_sk_mc_lock);
329 while ((mc_lst = np->ipv6_mc_list) != NULL) {
330 struct net_device *dev;
332 np->ipv6_mc_list = mc_lst->next;
333 write_unlock_bh(&ipv6_sk_mc_lock);
335 dev = dev_get_by_index(&init_net, mc_lst->ifindex);
337 struct inet6_dev *idev = in6_dev_get(dev);
339 (void) ip6_mc_leave_src(sk, mc_lst, idev);
341 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
346 (void) ip6_mc_leave_src(sk, mc_lst, NULL);
348 sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
350 write_lock_bh(&ipv6_sk_mc_lock);
352 write_unlock_bh(&ipv6_sk_mc_lock);
355 int ip6_mc_source(int add, int omode, struct sock *sk,
356 struct group_source_req *pgsr)
358 struct in6_addr *source, *group;
359 struct ipv6_mc_socklist *pmc;
360 struct net_device *dev;
361 struct inet6_dev *idev;
362 struct ipv6_pinfo *inet6 = inet6_sk(sk);
363 struct ip6_sf_socklist *psl;
369 if (pgsr->gsr_group.ss_family != AF_INET6 ||
370 pgsr->gsr_source.ss_family != AF_INET6)
373 source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
374 group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
376 if (!ipv6_addr_is_multicast(group))
379 idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
384 err = -EADDRNOTAVAIL;
386 read_lock_bh(&ipv6_sk_mc_lock);
387 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
388 if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
390 if (ipv6_addr_equal(&pmc->addr, group))
393 if (!pmc) { /* must have a prior join */
397 /* if a source filter was set, must be the same mode as before */
399 if (pmc->sfmode != omode) {
403 } else if (pmc->sfmode != omode) {
404 /* allow mode switches for empty-set filters */
405 ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
406 ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
410 write_lock_bh(&pmc->sflock);
416 goto done; /* err = -EADDRNOTAVAIL */
418 for (i=0; i<psl->sl_count; i++) {
419 rv = memcmp(&psl->sl_addr[i], source,
420 sizeof(struct in6_addr));
424 if (rv) /* source not found */
425 goto done; /* err = -EADDRNOTAVAIL */
427 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
428 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
433 /* update the interface filter */
434 ip6_mc_del_src(idev, group, omode, 1, source, 1);
436 for (j=i+1; j<psl->sl_count; j++)
437 psl->sl_addr[j-1] = psl->sl_addr[j];
442 /* else, add a new source to the filter */
444 if (psl && psl->sl_count >= sysctl_mld_max_msf) {
448 if (!psl || psl->sl_count == psl->sl_max) {
449 struct ip6_sf_socklist *newpsl;
450 int count = IP6_SFBLOCK;
453 count += psl->sl_max;
454 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
459 newpsl->sl_max = count;
460 newpsl->sl_count = count - IP6_SFBLOCK;
462 for (i=0; i<psl->sl_count; i++)
463 newpsl->sl_addr[i] = psl->sl_addr[i];
464 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
466 pmc->sflist = psl = newpsl;
468 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
469 for (i=0; i<psl->sl_count; i++) {
470 rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
474 if (rv == 0) /* address already there is an error */
476 for (j=psl->sl_count-1; j>=i; j--)
477 psl->sl_addr[j+1] = psl->sl_addr[j];
478 psl->sl_addr[i] = *source;
481 /* update the interface list */
482 ip6_mc_add_src(idev, group, omode, 1, source, 1);
485 write_unlock_bh(&pmc->sflock);
486 read_unlock_bh(&ipv6_sk_mc_lock);
487 read_unlock_bh(&idev->lock);
491 return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
495 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
497 struct in6_addr *group;
498 struct ipv6_mc_socklist *pmc;
499 struct net_device *dev;
500 struct inet6_dev *idev;
501 struct ipv6_pinfo *inet6 = inet6_sk(sk);
502 struct ip6_sf_socklist *newpsl, *psl;
506 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
508 if (!ipv6_addr_is_multicast(group))
510 if (gsf->gf_fmode != MCAST_INCLUDE &&
511 gsf->gf_fmode != MCAST_EXCLUDE)
514 idev = ip6_mc_find_dev(group, gsf->gf_interface);
521 read_lock_bh(&ipv6_sk_mc_lock);
523 if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
528 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
529 if (pmc->ifindex != gsf->gf_interface)
531 if (ipv6_addr_equal(&pmc->addr, group))
534 if (!pmc) { /* must have a prior join */
538 if (gsf->gf_numsrc) {
539 newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
545 newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
546 for (i=0; i<newpsl->sl_count; ++i) {
547 struct sockaddr_in6 *psin6;
549 psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
550 newpsl->sl_addr[i] = psin6->sin6_addr;
552 err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
553 newpsl->sl_count, newpsl->sl_addr, 0);
555 sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
560 (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
563 write_lock_bh(&pmc->sflock);
566 (void) ip6_mc_del_src(idev, group, pmc->sfmode,
567 psl->sl_count, psl->sl_addr, 0);
568 sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
570 (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
571 pmc->sflist = newpsl;
572 pmc->sfmode = gsf->gf_fmode;
573 write_unlock_bh(&pmc->sflock);
576 read_unlock_bh(&ipv6_sk_mc_lock);
577 read_unlock_bh(&idev->lock);
581 err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
585 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
586 struct group_filter __user *optval, int __user *optlen)
588 int err, i, count, copycount;
589 struct in6_addr *group;
590 struct ipv6_mc_socklist *pmc;
591 struct inet6_dev *idev;
592 struct net_device *dev;
593 struct ipv6_pinfo *inet6 = inet6_sk(sk);
594 struct ip6_sf_socklist *psl;
596 group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
598 if (!ipv6_addr_is_multicast(group))
601 idev = ip6_mc_find_dev(group, gsf->gf_interface);
608 err = -EADDRNOTAVAIL;
610 * changes to the ipv6_mc_list require the socket lock and
611 * a read lock on ip6_sk_mc_lock. We have the socket lock,
612 * so reading the list is safe.
615 for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
616 if (pmc->ifindex != gsf->gf_interface)
618 if (ipv6_addr_equal(group, &pmc->addr))
621 if (!pmc) /* must have a prior join */
623 gsf->gf_fmode = pmc->sfmode;
625 count = psl ? psl->sl_count : 0;
626 read_unlock_bh(&idev->lock);
630 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
631 gsf->gf_numsrc = count;
632 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
633 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
636 /* changes to psl require the socket lock, a read lock on
637 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
638 * have the socket lock, so reading here is safe.
640 for (i=0; i<copycount; i++) {
641 struct sockaddr_in6 *psin6;
642 struct sockaddr_storage ss;
644 psin6 = (struct sockaddr_in6 *)&ss;
645 memset(&ss, 0, sizeof(ss));
646 psin6->sin6_family = AF_INET6;
647 psin6->sin6_addr = psl->sl_addr[i];
648 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
653 read_unlock_bh(&idev->lock);
659 int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
660 struct in6_addr *src_addr)
662 struct ipv6_pinfo *np = inet6_sk(sk);
663 struct ipv6_mc_socklist *mc;
664 struct ip6_sf_socklist *psl;
667 read_lock(&ipv6_sk_mc_lock);
668 for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
669 if (ipv6_addr_equal(&mc->addr, mc_addr))
673 read_unlock(&ipv6_sk_mc_lock);
676 read_lock(&mc->sflock);
679 rv = mc->sfmode == MCAST_EXCLUDE;
683 for (i=0; i<psl->sl_count; i++) {
684 if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
687 if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
689 if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
692 read_unlock(&mc->sflock);
693 read_unlock(&ipv6_sk_mc_lock);
698 static void ma_put(struct ifmcaddr6 *mc)
700 if (atomic_dec_and_test(&mc->mca_refcnt)) {
701 in6_dev_put(mc->idev);
706 static void igmp6_group_added(struct ifmcaddr6 *mc)
708 struct net_device *dev = mc->idev->dev;
709 char buf[MAX_ADDR_LEN];
711 spin_lock_bh(&mc->mca_lock);
712 if (!(mc->mca_flags&MAF_LOADED)) {
713 mc->mca_flags |= MAF_LOADED;
714 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
715 dev_mc_add(dev, buf, dev->addr_len, 0);
717 spin_unlock_bh(&mc->mca_lock);
719 if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
722 if (MLD_V1_SEEN(mc->idev)) {
723 igmp6_join_group(mc);
728 mc->mca_crcount = mc->idev->mc_qrv;
729 mld_ifc_event(mc->idev);
732 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
734 struct net_device *dev = mc->idev->dev;
735 char buf[MAX_ADDR_LEN];
737 spin_lock_bh(&mc->mca_lock);
738 if (mc->mca_flags&MAF_LOADED) {
739 mc->mca_flags &= ~MAF_LOADED;
740 if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
741 dev_mc_delete(dev, buf, dev->addr_len, 0);
744 if (mc->mca_flags & MAF_NOREPORT)
746 spin_unlock_bh(&mc->mca_lock);
749 igmp6_leave_group(mc);
751 spin_lock_bh(&mc->mca_lock);
752 if (del_timer(&mc->mca_timer))
753 atomic_dec(&mc->mca_refcnt);
755 ip6_mc_clear_src(mc);
756 spin_unlock_bh(&mc->mca_lock);
760 * deleted ifmcaddr6 manipulation
762 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
764 struct ifmcaddr6 *pmc;
766 /* this is an "ifmcaddr6" for convenience; only the fields below
767 * are actually used. In particular, the refcnt and users are not
768 * used for management of the delete list. Using the same structure
769 * for deleted items allows change reports to use common code with
770 * non-deleted or query-response MCA's.
772 pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
776 spin_lock_bh(&im->mca_lock);
777 spin_lock_init(&pmc->mca_lock);
778 pmc->idev = im->idev;
780 pmc->mca_addr = im->mca_addr;
781 pmc->mca_crcount = idev->mc_qrv;
782 pmc->mca_sfmode = im->mca_sfmode;
783 if (pmc->mca_sfmode == MCAST_INCLUDE) {
784 struct ip6_sf_list *psf;
786 pmc->mca_tomb = im->mca_tomb;
787 pmc->mca_sources = im->mca_sources;
788 im->mca_tomb = im->mca_sources = NULL;
789 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
790 psf->sf_crcount = pmc->mca_crcount;
792 spin_unlock_bh(&im->mca_lock);
794 write_lock_bh(&idev->mc_lock);
795 pmc->next = idev->mc_tomb;
797 write_unlock_bh(&idev->mc_lock);
800 static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
802 struct ifmcaddr6 *pmc, *pmc_prev;
803 struct ip6_sf_list *psf, *psf_next;
805 write_lock_bh(&idev->mc_lock);
807 for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
808 if (ipv6_addr_equal(&pmc->mca_addr, pmca))
814 pmc_prev->next = pmc->next;
816 idev->mc_tomb = pmc->next;
818 write_unlock_bh(&idev->mc_lock);
820 for (psf=pmc->mca_tomb; psf; psf=psf_next) {
821 psf_next = psf->sf_next;
824 in6_dev_put(pmc->idev);
829 static void mld_clear_delrec(struct inet6_dev *idev)
831 struct ifmcaddr6 *pmc, *nextpmc;
833 write_lock_bh(&idev->mc_lock);
835 idev->mc_tomb = NULL;
836 write_unlock_bh(&idev->mc_lock);
838 for (; pmc; pmc = nextpmc) {
840 ip6_mc_clear_src(pmc);
841 in6_dev_put(pmc->idev);
845 /* clear dead sources, too */
846 read_lock_bh(&idev->lock);
847 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
848 struct ip6_sf_list *psf, *psf_next;
850 spin_lock_bh(&pmc->mca_lock);
852 pmc->mca_tomb = NULL;
853 spin_unlock_bh(&pmc->mca_lock);
854 for (; psf; psf=psf_next) {
855 psf_next = psf->sf_next;
859 read_unlock_bh(&idev->lock);
864 * device multicast group inc (add if not found)
866 int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
868 struct ifmcaddr6 *mc;
869 struct inet6_dev *idev;
871 idev = in6_dev_get(dev);
876 write_lock_bh(&idev->lock);
878 write_unlock_bh(&idev->lock);
883 for (mc = idev->mc_list; mc; mc = mc->next) {
884 if (ipv6_addr_equal(&mc->mca_addr, addr)) {
886 write_unlock_bh(&idev->lock);
887 ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
895 * not found: create a new one.
898 mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
901 write_unlock_bh(&idev->lock);
906 setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
908 ipv6_addr_copy(&mc->mca_addr, addr);
911 /* mca_stamp should be updated upon changes */
912 mc->mca_cstamp = mc->mca_tstamp = jiffies;
913 atomic_set(&mc->mca_refcnt, 2);
914 spin_lock_init(&mc->mca_lock);
916 /* initial mode is (EX, empty) */
917 mc->mca_sfmode = MCAST_EXCLUDE;
918 mc->mca_sfcount[MCAST_EXCLUDE] = 1;
920 if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
921 IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
922 mc->mca_flags |= MAF_NOREPORT;
924 mc->next = idev->mc_list;
926 write_unlock_bh(&idev->lock);
928 mld_del_delrec(idev, &mc->mca_addr);
929 igmp6_group_added(mc);
935 * device multicast group del
937 int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
939 struct ifmcaddr6 *ma, **map;
941 write_lock_bh(&idev->lock);
942 for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
943 if (ipv6_addr_equal(&ma->mca_addr, addr)) {
944 if (--ma->mca_users == 0) {
946 write_unlock_bh(&idev->lock);
948 igmp6_group_dropped(ma);
953 write_unlock_bh(&idev->lock);
957 write_unlock_bh(&idev->lock);
962 int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
964 struct inet6_dev *idev = in6_dev_get(dev);
970 err = __ipv6_dev_mc_dec(idev, addr);
978 * identify MLD packets for MLD filter exceptions
980 int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
982 struct icmp6hdr *pic;
984 if (nexthdr != IPPROTO_ICMPV6)
987 if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
990 pic = icmp6_hdr(skb);
992 switch (pic->icmp6_type) {
993 case ICMPV6_MGM_QUERY:
994 case ICMPV6_MGM_REPORT:
995 case ICMPV6_MGM_REDUCTION:
996 case ICMPV6_MLD2_REPORT:
1005 * check if the interface/address pair is valid
1007 int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
1008 struct in6_addr *src_addr)
1010 struct inet6_dev *idev;
1011 struct ifmcaddr6 *mc;
1014 idev = in6_dev_get(dev);
1016 read_lock_bh(&idev->lock);
1017 for (mc = idev->mc_list; mc; mc=mc->next) {
1018 if (ipv6_addr_equal(&mc->mca_addr, group))
1022 if (src_addr && !ipv6_addr_any(src_addr)) {
1023 struct ip6_sf_list *psf;
1025 spin_lock_bh(&mc->mca_lock);
1026 for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
1027 if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1031 rv = psf->sf_count[MCAST_INCLUDE] ||
1032 psf->sf_count[MCAST_EXCLUDE] !=
1033 mc->mca_sfcount[MCAST_EXCLUDE];
1035 rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
1036 spin_unlock_bh(&mc->mca_lock);
1038 rv = 1; /* don't filter unspecified source */
1040 read_unlock_bh(&idev->lock);
1046 static void mld_gq_start_timer(struct inet6_dev *idev)
1048 int tv = net_random() % idev->mc_maxdelay;
1050 idev->mc_gq_running = 1;
1051 if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1055 static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1057 int tv = net_random() % delay;
1059 if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1064 * IGMP handling (alias multicast ICMPv6 messages)
1067 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1069 unsigned long delay = resptime;
1071 /* Do not start timer for these addresses */
1072 if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1073 IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1076 if (del_timer(&ma->mca_timer)) {
1077 atomic_dec(&ma->mca_refcnt);
1078 delay = ma->mca_timer.expires - jiffies;
1081 if (delay >= resptime) {
1083 delay = net_random() % resptime;
1087 ma->mca_timer.expires = jiffies + delay;
1088 if (!mod_timer(&ma->mca_timer, jiffies + delay))
1089 atomic_inc(&ma->mca_refcnt);
1090 ma->mca_flags |= MAF_TIMER_RUNNING;
1093 /* mark EXCLUDE-mode sources */
1094 static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1095 struct in6_addr *srcs)
1097 struct ip6_sf_list *psf;
1101 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1102 if (scount == nsrcs)
1104 for (i=0; i<nsrcs; i++) {
1105 /* skip inactive filters */
1106 if (pmc->mca_sfcount[MCAST_INCLUDE] ||
1107 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1108 psf->sf_count[MCAST_EXCLUDE])
1110 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1116 pmc->mca_flags &= ~MAF_GSQUERY;
1117 if (scount == nsrcs) /* all sources excluded */
1122 static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1123 struct in6_addr *srcs)
1125 struct ip6_sf_list *psf;
1128 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1129 return mld_xmarksources(pmc, nsrcs, srcs);
1131 /* mark INCLUDE-mode sources */
1134 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1135 if (scount == nsrcs)
1137 for (i=0; i<nsrcs; i++) {
1138 if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1146 pmc->mca_flags &= ~MAF_GSQUERY;
1149 pmc->mca_flags |= MAF_GSQUERY;
1153 int igmp6_event_query(struct sk_buff *skb)
1155 struct mld2_query *mlh2 = NULL;
1156 struct ifmcaddr6 *ma;
1157 struct in6_addr *group;
1158 unsigned long max_delay;
1159 struct inet6_dev *idev;
1160 struct icmp6hdr *hdr;
1165 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1168 /* compute payload length excluding extension headers */
1169 len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1170 len -= skb_network_header_len(skb);
1172 /* Drop queries with not link local source */
1173 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1176 idev = in6_dev_get(skb->dev);
1181 hdr = icmp6_hdr(skb);
1182 group = (struct in6_addr *) (hdr + 1);
1183 group_type = ipv6_addr_type(group);
1185 if (group_type != IPV6_ADDR_ANY &&
1186 !(group_type&IPV6_ADDR_MULTICAST)) {
1193 /* MLDv1 router present */
1195 /* Translate milliseconds to jiffies */
1196 max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
1198 switchback = (idev->mc_qrv + 1) * max_delay;
1199 idev->mc_v1_seen = jiffies + switchback;
1201 /* cancel the interface change timer */
1202 idev->mc_ifc_count = 0;
1203 if (del_timer(&idev->mc_ifc_timer))
1204 __in6_dev_put(idev);
1205 /* clear deleted report items */
1206 mld_clear_delrec(idev);
1207 } else if (len >= 28) {
1208 int srcs_offset = sizeof(struct mld2_query) -
1209 sizeof(struct icmp6hdr);
1210 if (!pskb_may_pull(skb, srcs_offset)) {
1214 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1215 max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
1218 idev->mc_maxdelay = max_delay;
1220 idev->mc_qrv = mlh2->qrv;
1221 if (group_type == IPV6_ADDR_ANY) { /* general query */
1224 return -EINVAL; /* no sources allowed */
1226 mld_gq_start_timer(idev);
1230 /* mark sources to include, if group & source-specific */
1231 if (mlh2->nsrcs != 0) {
1232 if (!pskb_may_pull(skb, srcs_offset +
1233 ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
1237 mlh2 = (struct mld2_query *)skb_transport_header(skb);
1245 read_lock_bh(&idev->lock);
1246 if (group_type == IPV6_ADDR_ANY) {
1247 for (ma = idev->mc_list; ma; ma=ma->next) {
1248 spin_lock_bh(&ma->mca_lock);
1249 igmp6_group_queried(ma, max_delay);
1250 spin_unlock_bh(&ma->mca_lock);
1253 for (ma = idev->mc_list; ma; ma=ma->next) {
1254 if (!ipv6_addr_equal(group, &ma->mca_addr))
1256 spin_lock_bh(&ma->mca_lock);
1257 if (ma->mca_flags & MAF_TIMER_RUNNING) {
1258 /* gsquery <- gsquery && mark */
1260 ma->mca_flags &= ~MAF_GSQUERY;
1262 /* gsquery <- mark */
1264 ma->mca_flags |= MAF_GSQUERY;
1266 ma->mca_flags &= ~MAF_GSQUERY;
1268 if (!(ma->mca_flags & MAF_GSQUERY) ||
1269 mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
1270 igmp6_group_queried(ma, max_delay);
1271 spin_unlock_bh(&ma->mca_lock);
1275 read_unlock_bh(&idev->lock);
1282 int igmp6_event_report(struct sk_buff *skb)
1284 struct ifmcaddr6 *ma;
1285 struct in6_addr *addrp;
1286 struct inet6_dev *idev;
1287 struct icmp6hdr *hdr;
1290 /* Our own report looped back. Ignore it. */
1291 if (skb->pkt_type == PACKET_LOOPBACK)
1294 /* send our report if the MC router may not have heard this report */
1295 if (skb->pkt_type != PACKET_MULTICAST &&
1296 skb->pkt_type != PACKET_BROADCAST)
1299 if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1302 hdr = icmp6_hdr(skb);
1304 /* Drop reports with not link local source */
1305 addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1306 if (addr_type != IPV6_ADDR_ANY &&
1307 !(addr_type&IPV6_ADDR_LINKLOCAL))
1310 addrp = (struct in6_addr *) (hdr + 1);
1312 idev = in6_dev_get(skb->dev);
1317 * Cancel the timer for this group
1320 read_lock_bh(&idev->lock);
1321 for (ma = idev->mc_list; ma; ma=ma->next) {
1322 if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
1323 spin_lock(&ma->mca_lock);
1324 if (del_timer(&ma->mca_timer))
1325 atomic_dec(&ma->mca_refcnt);
1326 ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1327 spin_unlock(&ma->mca_lock);
1331 read_unlock_bh(&idev->lock);
1336 static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1337 int gdeleted, int sdeleted)
1340 case MLD2_MODE_IS_INCLUDE:
1341 case MLD2_MODE_IS_EXCLUDE:
1342 if (gdeleted || sdeleted)
1344 if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1345 if (pmc->mca_sfmode == MCAST_INCLUDE)
1347 /* don't include if this source is excluded
1350 if (psf->sf_count[MCAST_INCLUDE])
1351 return type == MLD2_MODE_IS_INCLUDE;
1352 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1353 psf->sf_count[MCAST_EXCLUDE];
1356 case MLD2_CHANGE_TO_INCLUDE:
1357 if (gdeleted || sdeleted)
1359 return psf->sf_count[MCAST_INCLUDE] != 0;
1360 case MLD2_CHANGE_TO_EXCLUDE:
1361 if (gdeleted || sdeleted)
1363 if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1364 psf->sf_count[MCAST_INCLUDE])
1366 return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1367 psf->sf_count[MCAST_EXCLUDE];
1368 case MLD2_ALLOW_NEW_SOURCES:
1369 if (gdeleted || !psf->sf_crcount)
1371 return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1372 case MLD2_BLOCK_OLD_SOURCES:
1373 if (pmc->mca_sfmode == MCAST_INCLUDE)
1374 return gdeleted || (psf->sf_crcount && sdeleted);
1375 return psf->sf_crcount && !gdeleted && !sdeleted;
1381 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1383 struct ip6_sf_list *psf;
1386 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1387 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1394 static struct sk_buff *mld_newpack(struct net_device *dev, int size)
1396 struct sock *sk = igmp6_socket->sk;
1397 struct sk_buff *skb;
1398 struct mld2_report *pmr;
1399 struct in6_addr addr_buf;
1401 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1402 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1405 /* we assume size > sizeof(ra) here */
1406 skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
1411 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1413 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1414 /* <draft-ietf-magma-mld-source-05.txt>:
1415 * use unspecified address as the source address
1416 * when a valid link-local address is not available.
1418 memset(&addr_buf, 0, sizeof(addr_buf));
1421 ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
1423 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1425 skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1426 skb_put(skb, sizeof(*pmr));
1427 pmr = (struct mld2_report *)skb_transport_header(skb);
1428 pmr->type = ICMPV6_MLD2_REPORT;
1436 static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
1438 struct net_device *dev = skb->dev;
1439 unsigned char ha[MAX_ADDR_LEN];
1441 ndisc_mc_map(&ipv6_hdr(skb)->daddr, ha, dev, 1);
1442 if (dev_hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len) < 0) {
1446 return dev_queue_xmit(skb);
1449 static inline int mld_dev_queue_xmit(struct sk_buff *skb)
1451 return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dev,
1452 mld_dev_queue_xmit2);
1455 static void mld_sendpack(struct sk_buff *skb)
1457 struct ipv6hdr *pip6 = ipv6_hdr(skb);
1458 struct mld2_report *pmr =
1459 (struct mld2_report *)skb_transport_header(skb);
1460 int payload_len, mldlen;
1461 struct inet6_dev *idev = in6_dev_get(skb->dev);
1464 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1465 payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1466 mldlen = skb->tail - skb->transport_header;
1467 pip6->payload_len = htons(payload_len);
1469 pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1470 IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb),
1472 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1473 mld_dev_queue_xmit);
1475 ICMP6MSGOUT_INC_STATS_BH(idev, ICMPV6_MLD2_REPORT);
1476 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1477 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTMCASTPKTS);
1479 IP6_INC_STATS_BH(idev, IPSTATS_MIB_OUTDISCARDS);
1481 if (likely(idev != NULL))
1485 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1487 return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1490 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1491 int type, struct mld2_grec **ppgr)
1493 struct net_device *dev = pmc->idev->dev;
1494 struct mld2_report *pmr;
1495 struct mld2_grec *pgr;
1498 skb = mld_newpack(dev, dev->mtu);
1501 pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1502 pgr->grec_type = type;
1503 pgr->grec_auxwords = 0;
1504 pgr->grec_nsrcs = 0;
1505 pgr->grec_mca = pmc->mca_addr; /* structure copy */
1506 pmr = (struct mld2_report *)skb_transport_header(skb);
1507 pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
1512 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1513 skb_tailroom(skb)) : 0)
1515 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1516 int type, int gdeleted, int sdeleted)
1518 struct net_device *dev = pmc->idev->dev;
1519 struct mld2_report *pmr;
1520 struct mld2_grec *pgr = NULL;
1521 struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1522 int scount, stotal, first, isquery, truncate;
1524 if (pmc->mca_flags & MAF_NOREPORT)
1527 isquery = type == MLD2_MODE_IS_INCLUDE ||
1528 type == MLD2_MODE_IS_EXCLUDE;
1529 truncate = type == MLD2_MODE_IS_EXCLUDE ||
1530 type == MLD2_CHANGE_TO_EXCLUDE;
1532 stotal = scount = 0;
1534 psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1539 pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1541 /* EX and TO_EX get a fresh packet, if needed */
1543 if (pmr && pmr->ngrec &&
1544 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1547 skb = mld_newpack(dev, dev->mtu);
1552 for (psf=*psf_list; psf; psf=psf_next) {
1553 struct in6_addr *psrc;
1555 psf_next = psf->sf_next;
1557 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1562 /* clear marks on query responses */
1566 if (AVAILABLE(skb) < sizeof(*psrc) +
1567 first*sizeof(struct mld2_grec)) {
1568 if (truncate && !first)
1569 break; /* truncate these */
1571 pgr->grec_nsrcs = htons(scount);
1574 skb = mld_newpack(dev, dev->mtu);
1579 skb = add_grhead(skb, pmc, type, &pgr);
1584 psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1585 *psrc = psf->sf_addr;
1587 if ((type == MLD2_ALLOW_NEW_SOURCES ||
1588 type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1590 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1592 psf_prev->sf_next = psf->sf_next;
1594 *psf_list = psf->sf_next;
1604 if (type == MLD2_ALLOW_NEW_SOURCES ||
1605 type == MLD2_BLOCK_OLD_SOURCES)
1607 if (pmc->mca_crcount || isquery) {
1608 /* make sure we have room for group header */
1609 if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1611 skb = NULL; /* add_grhead will get a new one */
1613 skb = add_grhead(skb, pmc, type, &pgr);
1617 pgr->grec_nsrcs = htons(scount);
1620 pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1624 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1626 struct sk_buff *skb = NULL;
1630 read_lock_bh(&idev->lock);
1631 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1632 if (pmc->mca_flags & MAF_NOREPORT)
1634 spin_lock_bh(&pmc->mca_lock);
1635 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1636 type = MLD2_MODE_IS_EXCLUDE;
1638 type = MLD2_MODE_IS_INCLUDE;
1639 skb = add_grec(skb, pmc, type, 0, 0);
1640 spin_unlock_bh(&pmc->mca_lock);
1642 read_unlock_bh(&idev->lock);
1644 spin_lock_bh(&pmc->mca_lock);
1645 if (pmc->mca_sfcount[MCAST_EXCLUDE])
1646 type = MLD2_MODE_IS_EXCLUDE;
1648 type = MLD2_MODE_IS_INCLUDE;
1649 skb = add_grec(skb, pmc, type, 0, 0);
1650 spin_unlock_bh(&pmc->mca_lock);
1657 * remove zero-count source records from a source filter list
1659 static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1661 struct ip6_sf_list *psf_prev, *psf_next, *psf;
1664 for (psf=*ppsf; psf; psf = psf_next) {
1665 psf_next = psf->sf_next;
1666 if (psf->sf_crcount == 0) {
1668 psf_prev->sf_next = psf->sf_next;
1670 *ppsf = psf->sf_next;
1677 static void mld_send_cr(struct inet6_dev *idev)
1679 struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1680 struct sk_buff *skb = NULL;
1683 read_lock_bh(&idev->lock);
1684 write_lock_bh(&idev->mc_lock);
1688 for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1689 pmc_next = pmc->next;
1690 if (pmc->mca_sfmode == MCAST_INCLUDE) {
1691 type = MLD2_BLOCK_OLD_SOURCES;
1692 dtype = MLD2_BLOCK_OLD_SOURCES;
1693 skb = add_grec(skb, pmc, type, 1, 0);
1694 skb = add_grec(skb, pmc, dtype, 1, 1);
1696 if (pmc->mca_crcount) {
1697 if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1698 type = MLD2_CHANGE_TO_INCLUDE;
1699 skb = add_grec(skb, pmc, type, 1, 0);
1702 if (pmc->mca_crcount == 0) {
1703 mld_clear_zeros(&pmc->mca_tomb);
1704 mld_clear_zeros(&pmc->mca_sources);
1707 if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1708 !pmc->mca_sources) {
1710 pmc_prev->next = pmc_next;
1712 idev->mc_tomb = pmc_next;
1713 in6_dev_put(pmc->idev);
1718 write_unlock_bh(&idev->mc_lock);
1721 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1722 spin_lock_bh(&pmc->mca_lock);
1723 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1724 type = MLD2_BLOCK_OLD_SOURCES;
1725 dtype = MLD2_ALLOW_NEW_SOURCES;
1727 type = MLD2_ALLOW_NEW_SOURCES;
1728 dtype = MLD2_BLOCK_OLD_SOURCES;
1730 skb = add_grec(skb, pmc, type, 0, 0);
1731 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
1733 /* filter mode changes */
1734 if (pmc->mca_crcount) {
1735 if (pmc->mca_sfmode == MCAST_EXCLUDE)
1736 type = MLD2_CHANGE_TO_EXCLUDE;
1738 type = MLD2_CHANGE_TO_INCLUDE;
1739 skb = add_grec(skb, pmc, type, 0, 0);
1742 spin_unlock_bh(&pmc->mca_lock);
1744 read_unlock_bh(&idev->lock);
1747 (void) mld_sendpack(skb);
1750 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1752 struct sock *sk = igmp6_socket->sk;
1753 struct inet6_dev *idev;
1754 struct sk_buff *skb;
1755 struct icmp6hdr *hdr;
1756 struct in6_addr *snd_addr;
1757 struct in6_addr *addrp;
1758 struct in6_addr addr_buf;
1759 struct in6_addr all_routers;
1760 int err, len, payload_len, full_len;
1761 u8 ra[8] = { IPPROTO_ICMPV6, 0,
1762 IPV6_TLV_ROUTERALERT, 2, 0, 0,
1766 IP6_INC_STATS(__in6_dev_get(dev),
1767 IPSTATS_MIB_OUTREQUESTS);
1770 if (type == ICMPV6_MGM_REDUCTION) {
1771 snd_addr = &all_routers;
1772 ipv6_addr_all_routers(&all_routers);
1775 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1776 payload_len = len + sizeof(ra);
1777 full_len = sizeof(struct ipv6hdr) + payload_len;
1779 skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
1783 IP6_INC_STATS(__in6_dev_get(dev),
1784 IPSTATS_MIB_OUTDISCARDS);
1789 skb_reserve(skb, LL_RESERVED_SPACE(dev));
1791 if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1792 /* <draft-ietf-magma-mld-source-05.txt>:
1793 * use unspecified address as the source address
1794 * when a valid link-local address is not available.
1796 memset(&addr_buf, 0, sizeof(addr_buf));
1799 ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
1801 memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1803 hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
1804 memset(hdr, 0, sizeof(struct icmp6hdr));
1805 hdr->icmp6_type = type;
1807 addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
1808 ipv6_addr_copy(addrp, addr);
1810 hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
1812 csum_partial((__u8 *) hdr, len, 0));
1814 idev = in6_dev_get(skb->dev);
1816 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1817 mld_dev_queue_xmit);
1819 ICMP6MSGOUT_INC_STATS(idev, type);
1820 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1821 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
1823 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
1825 if (likely(idev != NULL))
1830 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1831 struct in6_addr *psfsrc)
1833 struct ip6_sf_list *psf, *psf_prev;
1837 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1838 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1842 if (!psf || psf->sf_count[sfmode] == 0) {
1843 /* source filter not found, or count wrong => bug */
1846 psf->sf_count[sfmode]--;
1847 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1848 struct inet6_dev *idev = pmc->idev;
1850 /* no more filters for this source */
1852 psf_prev->sf_next = psf->sf_next;
1854 pmc->mca_sources = psf->sf_next;
1855 if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1856 !MLD_V1_SEEN(idev)) {
1857 psf->sf_crcount = idev->mc_qrv;
1858 psf->sf_next = pmc->mca_tomb;
1859 pmc->mca_tomb = psf;
1867 static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
1868 int sfmode, int sfcount, struct in6_addr *psfsrc,
1871 struct ifmcaddr6 *pmc;
1877 read_lock_bh(&idev->lock);
1878 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1879 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1883 /* MCA not found?? bug */
1884 read_unlock_bh(&idev->lock);
1887 spin_lock_bh(&pmc->mca_lock);
1890 if (!pmc->mca_sfcount[sfmode]) {
1891 spin_unlock_bh(&pmc->mca_lock);
1892 read_unlock_bh(&idev->lock);
1895 pmc->mca_sfcount[sfmode]--;
1898 for (i=0; i<sfcount; i++) {
1899 int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1901 changerec |= rv > 0;
1905 if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1906 pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1907 pmc->mca_sfcount[MCAST_INCLUDE]) {
1908 struct ip6_sf_list *psf;
1910 /* filter mode change */
1911 pmc->mca_sfmode = MCAST_INCLUDE;
1912 pmc->mca_crcount = idev->mc_qrv;
1913 idev->mc_ifc_count = pmc->mca_crcount;
1914 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1915 psf->sf_crcount = 0;
1916 mld_ifc_event(pmc->idev);
1917 } else if (sf_setstate(pmc) || changerec)
1918 mld_ifc_event(pmc->idev);
1919 spin_unlock_bh(&pmc->mca_lock);
1920 read_unlock_bh(&idev->lock);
1925 * Add multicast single-source filter to the interface list
1927 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1928 struct in6_addr *psfsrc, int delta)
1930 struct ip6_sf_list *psf, *psf_prev;
1933 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1934 if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1939 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1943 psf->sf_addr = *psfsrc;
1945 psf_prev->sf_next = psf;
1947 pmc->mca_sources = psf;
1949 psf->sf_count[sfmode]++;
1953 static void sf_markstate(struct ifmcaddr6 *pmc)
1955 struct ip6_sf_list *psf;
1956 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1958 for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1959 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1960 psf->sf_oldin = mca_xcount ==
1961 psf->sf_count[MCAST_EXCLUDE] &&
1962 !psf->sf_count[MCAST_INCLUDE];
1964 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1967 static int sf_setstate(struct ifmcaddr6 *pmc)
1969 struct ip6_sf_list *psf, *dpsf;
1970 int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1971 int qrv = pmc->idev->mc_qrv;
1975 for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1976 if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1977 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1978 !psf->sf_count[MCAST_INCLUDE];
1980 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1982 if (!psf->sf_oldin) {
1983 struct ip6_sf_list *prev = NULL;
1985 for (dpsf=pmc->mca_tomb; dpsf;
1986 dpsf=dpsf->sf_next) {
1987 if (ipv6_addr_equal(&dpsf->sf_addr,
1994 prev->sf_next = dpsf->sf_next;
1996 pmc->mca_tomb = dpsf->sf_next;
1999 psf->sf_crcount = qrv;
2002 } else if (psf->sf_oldin) {
2003 psf->sf_crcount = 0;
2005 * add or update "delete" records if an active filter
2008 for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
2009 if (ipv6_addr_equal(&dpsf->sf_addr,
2013 dpsf = (struct ip6_sf_list *)
2014 kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2018 /* pmc->mca_lock held by callers */
2019 dpsf->sf_next = pmc->mca_tomb;
2020 pmc->mca_tomb = dpsf;
2022 dpsf->sf_crcount = qrv;
2030 * Add multicast source filter list to the interface list
2032 static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
2033 int sfmode, int sfcount, struct in6_addr *psfsrc,
2036 struct ifmcaddr6 *pmc;
2042 read_lock_bh(&idev->lock);
2043 for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2044 if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2048 /* MCA not found?? bug */
2049 read_unlock_bh(&idev->lock);
2052 spin_lock_bh(&pmc->mca_lock);
2055 isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2057 pmc->mca_sfcount[sfmode]++;
2059 for (i=0; i<sfcount; i++) {
2060 err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2068 pmc->mca_sfcount[sfmode]--;
2070 (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2071 } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2072 struct inet6_dev *idev = pmc->idev;
2073 struct ip6_sf_list *psf;
2075 /* filter mode change */
2076 if (pmc->mca_sfcount[MCAST_EXCLUDE])
2077 pmc->mca_sfmode = MCAST_EXCLUDE;
2078 else if (pmc->mca_sfcount[MCAST_INCLUDE])
2079 pmc->mca_sfmode = MCAST_INCLUDE;
2080 /* else no filters; keep old mode for reports */
2082 pmc->mca_crcount = idev->mc_qrv;
2083 idev->mc_ifc_count = pmc->mca_crcount;
2084 for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2085 psf->sf_crcount = 0;
2086 mld_ifc_event(idev);
2087 } else if (sf_setstate(pmc))
2088 mld_ifc_event(idev);
2089 spin_unlock_bh(&pmc->mca_lock);
2090 read_unlock_bh(&idev->lock);
2094 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2096 struct ip6_sf_list *psf, *nextpsf;
2098 for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2099 nextpsf = psf->sf_next;
2102 pmc->mca_tomb = NULL;
2103 for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2104 nextpsf = psf->sf_next;
2107 pmc->mca_sources = NULL;
2108 pmc->mca_sfmode = MCAST_EXCLUDE;
2109 pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2110 pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2114 static void igmp6_join_group(struct ifmcaddr6 *ma)
2116 unsigned long delay;
2118 if (ma->mca_flags & MAF_NOREPORT)
2121 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2123 delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2125 spin_lock_bh(&ma->mca_lock);
2126 if (del_timer(&ma->mca_timer)) {
2127 atomic_dec(&ma->mca_refcnt);
2128 delay = ma->mca_timer.expires - jiffies;
2131 if (!mod_timer(&ma->mca_timer, jiffies + delay))
2132 atomic_inc(&ma->mca_refcnt);
2133 ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2134 spin_unlock_bh(&ma->mca_lock);
2137 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2138 struct inet6_dev *idev)
2142 /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2143 * so no other readers or writers of iml or its sflist
2146 /* any-source empty exclude case */
2147 return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2149 err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2150 iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2151 sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2156 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2158 if (MLD_V1_SEEN(ma->idev)) {
2159 if (ma->mca_flags & MAF_LAST_REPORTER)
2160 igmp6_send(&ma->mca_addr, ma->idev->dev,
2161 ICMPV6_MGM_REDUCTION);
2163 mld_add_delrec(ma->idev, ma);
2164 mld_ifc_event(ma->idev);
2168 static void mld_gq_timer_expire(unsigned long data)
2170 struct inet6_dev *idev = (struct inet6_dev *)data;
2172 idev->mc_gq_running = 0;
2173 mld_send_report(idev, NULL);
2174 __in6_dev_put(idev);
2177 static void mld_ifc_timer_expire(unsigned long data)
2179 struct inet6_dev *idev = (struct inet6_dev *)data;
2182 if (idev->mc_ifc_count) {
2183 idev->mc_ifc_count--;
2184 if (idev->mc_ifc_count)
2185 mld_ifc_start_timer(idev, idev->mc_maxdelay);
2187 __in6_dev_put(idev);
2190 static void mld_ifc_event(struct inet6_dev *idev)
2192 if (MLD_V1_SEEN(idev))
2194 idev->mc_ifc_count = idev->mc_qrv;
2195 mld_ifc_start_timer(idev, 1);
2199 static void igmp6_timer_handler(unsigned long data)
2201 struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2203 if (MLD_V1_SEEN(ma->idev))
2204 igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2206 mld_send_report(ma->idev, ma);
2208 spin_lock(&ma->mca_lock);
2209 ma->mca_flags |= MAF_LAST_REPORTER;
2210 ma->mca_flags &= ~MAF_TIMER_RUNNING;
2211 spin_unlock(&ma->mca_lock);
2215 /* Device going down */
2217 void ipv6_mc_down(struct inet6_dev *idev)
2219 struct ifmcaddr6 *i;
2221 /* Withdraw multicast list */
2223 read_lock_bh(&idev->lock);
2224 idev->mc_ifc_count = 0;
2225 if (del_timer(&idev->mc_ifc_timer))
2226 __in6_dev_put(idev);
2227 idev->mc_gq_running = 0;
2228 if (del_timer(&idev->mc_gq_timer))
2229 __in6_dev_put(idev);
2231 for (i = idev->mc_list; i; i=i->next)
2232 igmp6_group_dropped(i);
2233 read_unlock_bh(&idev->lock);
2235 mld_clear_delrec(idev);
2239 /* Device going up */
2241 void ipv6_mc_up(struct inet6_dev *idev)
2243 struct ifmcaddr6 *i;
2245 /* Install multicast list, except for all-nodes (already installed) */
2247 read_lock_bh(&idev->lock);
2248 for (i = idev->mc_list; i; i=i->next)
2249 igmp6_group_added(i);
2250 read_unlock_bh(&idev->lock);
2253 /* IPv6 device initialization. */
2255 void ipv6_mc_init_dev(struct inet6_dev *idev)
2257 write_lock_bh(&idev->lock);
2258 rwlock_init(&idev->mc_lock);
2259 idev->mc_gq_running = 0;
2260 setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2261 (unsigned long)idev);
2262 idev->mc_tomb = NULL;
2263 idev->mc_ifc_count = 0;
2264 setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2265 (unsigned long)idev);
2266 idev->mc_qrv = MLD_QRV_DEFAULT;
2267 idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
2268 idev->mc_v1_seen = 0;
2269 write_unlock_bh(&idev->lock);
2273 * Device is about to be destroyed: clean up.
2276 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2278 struct ifmcaddr6 *i;
2279 struct in6_addr maddr;
2281 /* Deactivate timers */
2284 /* Delete all-nodes address. */
2285 ipv6_addr_all_nodes(&maddr);
2287 /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2288 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2291 __ipv6_dev_mc_dec(idev, &maddr);
2293 if (idev->cnf.forwarding) {
2294 ipv6_addr_all_routers(&maddr);
2295 __ipv6_dev_mc_dec(idev, &maddr);
2298 write_lock_bh(&idev->lock);
2299 while ((i = idev->mc_list) != NULL) {
2300 idev->mc_list = i->next;
2301 write_unlock_bh(&idev->lock);
2303 igmp6_group_dropped(i);
2306 write_lock_bh(&idev->lock);
2308 write_unlock_bh(&idev->lock);
2311 #ifdef CONFIG_PROC_FS
2312 struct igmp6_mc_iter_state {
2313 struct net_device *dev;
2314 struct inet6_dev *idev;
2317 #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private)
2319 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2321 struct ifmcaddr6 *im = NULL;
2322 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2325 for_each_netdev(&init_net, state->dev) {
2326 struct inet6_dev *idev;
2327 idev = in6_dev_get(state->dev);
2330 read_lock_bh(&idev->lock);
2336 read_unlock_bh(&idev->lock);
2342 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2344 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2348 if (likely(state->idev != NULL)) {
2349 read_unlock_bh(&state->idev->lock);
2350 in6_dev_put(state->idev);
2352 state->dev = next_net_device(state->dev);
2357 state->idev = in6_dev_get(state->dev);
2360 read_lock_bh(&state->idev->lock);
2361 im = state->idev->mc_list;
2366 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2368 struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2370 while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2372 return pos ? NULL : im;
2375 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2376 __acquires(dev_base_lock)
2378 read_lock(&dev_base_lock);
2379 return igmp6_mc_get_idx(seq, *pos);
2382 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2384 struct ifmcaddr6 *im;
2385 im = igmp6_mc_get_next(seq, v);
2390 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2391 __releases(dev_base_lock)
2393 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2394 if (likely(state->idev != NULL)) {
2395 read_unlock_bh(&state->idev->lock);
2396 in6_dev_put(state->idev);
2400 read_unlock(&dev_base_lock);
2403 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2405 struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2406 struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2409 "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
2410 state->dev->ifindex, state->dev->name,
2412 im->mca_users, im->mca_flags,
2413 (im->mca_flags&MAF_TIMER_RUNNING) ?
2414 jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2418 static const struct seq_operations igmp6_mc_seq_ops = {
2419 .start = igmp6_mc_seq_start,
2420 .next = igmp6_mc_seq_next,
2421 .stop = igmp6_mc_seq_stop,
2422 .show = igmp6_mc_seq_show,
2425 static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2427 return seq_open_private(file, &igmp6_mc_seq_ops,
2428 sizeof(struct igmp6_mc_iter_state));
2431 static const struct file_operations igmp6_mc_seq_fops = {
2432 .owner = THIS_MODULE,
2433 .open = igmp6_mc_seq_open,
2435 .llseek = seq_lseek,
2436 .release = seq_release_private,
2439 struct igmp6_mcf_iter_state {
2440 struct net_device *dev;
2441 struct inet6_dev *idev;
2442 struct ifmcaddr6 *im;
2445 #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private)
2447 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2449 struct ip6_sf_list *psf = NULL;
2450 struct ifmcaddr6 *im = NULL;
2451 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2455 for_each_netdev(&init_net, state->dev) {
2456 struct inet6_dev *idev;
2457 idev = in6_dev_get(state->dev);
2458 if (unlikely(idev == NULL))
2460 read_lock_bh(&idev->lock);
2462 if (likely(im != NULL)) {
2463 spin_lock_bh(&im->mca_lock);
2464 psf = im->mca_sources;
2465 if (likely(psf != NULL)) {
2470 spin_unlock_bh(&im->mca_lock);
2472 read_unlock_bh(&idev->lock);
2478 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2480 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2484 spin_unlock_bh(&state->im->mca_lock);
2485 state->im = state->im->next;
2486 while (!state->im) {
2487 if (likely(state->idev != NULL)) {
2488 read_unlock_bh(&state->idev->lock);
2489 in6_dev_put(state->idev);
2491 state->dev = next_net_device(state->dev);
2496 state->idev = in6_dev_get(state->dev);
2499 read_lock_bh(&state->idev->lock);
2500 state->im = state->idev->mc_list;
2504 spin_lock_bh(&state->im->mca_lock);
2505 psf = state->im->mca_sources;
2511 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2513 struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2515 while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2517 return pos ? NULL : psf;
2520 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2521 __acquires(dev_base_lock)
2523 read_lock(&dev_base_lock);
2524 return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2527 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2529 struct ip6_sf_list *psf;
2530 if (v == SEQ_START_TOKEN)
2531 psf = igmp6_mcf_get_first(seq);
2533 psf = igmp6_mcf_get_next(seq, v);
2538 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2539 __releases(dev_base_lock)
2541 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2542 if (likely(state->im != NULL)) {
2543 spin_unlock_bh(&state->im->mca_lock);
2546 if (likely(state->idev != NULL)) {
2547 read_unlock_bh(&state->idev->lock);
2548 in6_dev_put(state->idev);
2552 read_unlock(&dev_base_lock);
2555 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2557 struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2558 struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2560 if (v == SEQ_START_TOKEN) {
2563 "%32s %32s %6s %6s\n", "Idx",
2564 "Device", "Multicast Address",
2565 "Source Address", "INC", "EXC");
2568 "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
2569 state->dev->ifindex, state->dev->name,
2570 NIP6(state->im->mca_addr),
2572 psf->sf_count[MCAST_INCLUDE],
2573 psf->sf_count[MCAST_EXCLUDE]);
2578 static const struct seq_operations igmp6_mcf_seq_ops = {
2579 .start = igmp6_mcf_seq_start,
2580 .next = igmp6_mcf_seq_next,
2581 .stop = igmp6_mcf_seq_stop,
2582 .show = igmp6_mcf_seq_show,
2585 static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2587 return seq_open_private(file, &igmp6_mcf_seq_ops,
2588 sizeof(struct igmp6_mcf_iter_state));
2591 static const struct file_operations igmp6_mcf_seq_fops = {
2592 .owner = THIS_MODULE,
2593 .open = igmp6_mcf_seq_open,
2595 .llseek = seq_lseek,
2596 .release = seq_release_private,
2600 int __init igmp6_init(struct net_proto_family *ops)
2602 struct ipv6_pinfo *np;
2606 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
2609 "Failed to initialize the IGMP6 control socket (err %d).\n",
2611 igmp6_socket = NULL; /* For safety. */
2615 sk = igmp6_socket->sk;
2616 sk->sk_allocation = GFP_ATOMIC;
2617 sk->sk_prot->unhash(sk);
2622 #ifdef CONFIG_PROC_FS
2623 proc_net_fops_create(&init_net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops);
2624 proc_net_fops_create(&init_net, "mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
2630 void igmp6_cleanup(void)
2632 sock_release(igmp6_socket);
2633 igmp6_socket = NULL; /* for safety */
2635 #ifdef CONFIG_PROC_FS
2636 proc_net_remove(&init_net, "mcfilter6");
2637 proc_net_remove(&init_net, "igmp6");