Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2499 insertions, 0 deletions

diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
new file mode 100644
index 000000000000..393b6e6f50a9
--- /dev/null
+++ b/net/ipv6/mcast.c
@@ -0,0 +1,2499 @@
+/*
+ *	Multicast support for IPv6
+ *	Linux INET6 implementation 
+ *
+ *	Authors:
+ *	Pedro Roque		<roque@di.fc.ul.pt>	
+ *
+ *	$Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $
+ *
+ *	Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c 
+ *
+ *	This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+/* Changes:
+ *
+ *	yoshfuji	: fix format of router-alert option
+ *	YOSHIFUJI Hideaki @USAGI:
+ *		Fixed source address for MLD message based on
+ *		<draft-ietf-magma-mld-source-05.txt>.
+ *	YOSHIFUJI Hideaki @USAGI:
+ *		- Ignore Queries for invalid addresses.
+ *		- MLD for link-local addresses.
+ *	David L Stevens <dlstevens@us.ibm.com>:
+ *		- MLDv2 support
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/jiffies.h>
+#include <linux/times.h>
+#include <linux/net.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/route.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv6.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/protocol.h>
+#include <net/if_inet6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/ip6_route.h>
+
+#include <net/ip6_checksum.h>
+
+/* Set to 3 to get tracing... */
+#define MCAST_DEBUG 2
+
+#if MCAST_DEBUG >= 3
+#define MDBG(x) printk x
+#else
+#define MDBG(x)
+#endif
+
+/*
+ *  These header formats should be in a separate include file, but icmpv6.h
+ *  doesn't have in6_addr defined in all cases, there is no __u128, and no
+ *  other files reference these.
+ *
+ *  			+-DLS 4/14/03
+ */
+
+/* Multicast Listener Discovery version 2 headers */
+
+struct mld2_grec {
+	__u8		grec_type;
+	__u8		grec_auxwords;
+	__u16		grec_nsrcs;
+	struct in6_addr	grec_mca;
+	struct in6_addr	grec_src[0];
+};
+
+struct mld2_report {
+	__u8	type;
+	__u8	resv1;
+	__u16	csum;
+	__u16	resv2;
+	__u16	ngrec;
+	struct mld2_grec grec[0];
+};
+
+struct mld2_query {
+	__u8 type;
+	__u8 code;
+	__u16 csum;
+	__u16 mrc;
+	__u16 resv1;
+	struct in6_addr mca;
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	__u8 qrv:3,
+	     suppress:1,
+	     resv2:4;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+	__u8 resv2:4,
+	     suppress:1,
+	     qrv:3;
+#else
+#error "Please fix <asm/byteorder.h>"
+#endif
+	__u8 qqic;
+	__u16 nsrcs;
+	struct in6_addr srcs[0];
+};
+
+static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
+
+/* Big mc list lock for all the sockets */
+static DEFINE_RWLOCK(ipv6_sk_mc_lock);
+
+static struct socket *igmp6_socket;
+
+int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr);
+
+static void igmp6_join_group(struct ifmcaddr6 *ma);
+static void igmp6_leave_group(struct ifmcaddr6 *ma);
+static void igmp6_timer_handler(unsigned long data);
+
+static void mld_gq_timer_expire(unsigned long data);
+static void mld_ifc_timer_expire(unsigned long data);
+static void mld_ifc_event(struct inet6_dev *idev);
+static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
+static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr);
+static void mld_clear_delrec(struct inet6_dev *idev);
+static int sf_setstate(struct ifmcaddr6 *pmc);
+static void sf_markstate(struct ifmcaddr6 *pmc);
+static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
+static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
+			  int sfmode, int sfcount, struct in6_addr *psfsrc,
+			  int delta);
+static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
+			  int sfmode, int sfcount, struct in6_addr *psfsrc,
+			  int delta);
+static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
+			    struct inet6_dev *idev);
+
+
+#define IGMP6_UNSOLICITED_IVAL	(10*HZ)
+#define MLD_QRV_DEFAULT		2
+
+#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \
+		(idev)->cnf.force_mld_version == 1 || \
+		((idev)->mc_v1_seen && \
+		time_before(jiffies, (idev)->mc_v1_seen)))
+
+#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value))
+#define MLDV2_EXP(thresh, nbmant, nbexp, value) \
+	((value) < (thresh) ? (value) : \
+	((MLDV2_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \
+	(MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp))))
+
+#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
+#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
+
+#define IPV6_MLD_MAX_MSF	10
+
+int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF;
+
+/*
+ *	socket join on multicast group
+ */
+
+int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
+{
+	struct net_device *dev = NULL;
+	struct ipv6_mc_socklist *mc_lst;
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	int err;
+
+	if (!ipv6_addr_is_multicast(addr))
+		return -EINVAL;
+
+	mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
+
+	if (mc_lst == NULL)
+		return -ENOMEM;
+
+	mc_lst->next = NULL;
+	ipv6_addr_copy(&mc_lst->addr, addr);
+
+	if (ifindex == 0) {
+		struct rt6_info *rt;
+		rt = rt6_lookup(addr, NULL, 0, 0);
+		if (rt) {
+			dev = rt->rt6i_dev;
+			dev_hold(dev);
+			dst_release(&rt->u.dst);
+		}
+	} else
+		dev = dev_get_by_index(ifindex);
+
+	if (dev == NULL) {
+		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
+		return -ENODEV;
+	}
+
+	mc_lst->ifindex = dev->ifindex;
+	mc_lst->sfmode = MCAST_EXCLUDE;
+	mc_lst->sflist = NULL;
+
+	/*
+	 *	now add/increase the group membership on the device
+	 */
+
+	err = ipv6_dev_mc_inc(dev, addr);
+
+	if (err) {
+		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
+		dev_put(dev);
+		return err;
+	}
+
+	write_lock_bh(&ipv6_sk_mc_lock);
+	mc_lst->next = np->ipv6_mc_list;
+	np->ipv6_mc_list = mc_lst;
+	write_unlock_bh(&ipv6_sk_mc_lock);
+
+	dev_put(dev);
+
+	return 0;
+}
+
+/*
+ *	socket leave on multicast group
+ */
+int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct ipv6_mc_socklist *mc_lst, **lnk;
+
+	write_lock_bh(&ipv6_sk_mc_lock);
+	for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) {
+		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
+		    ipv6_addr_equal(&mc_lst->addr, addr)) {
+			struct net_device *dev;
+
+			*lnk = mc_lst->next;
+			write_unlock_bh(&ipv6_sk_mc_lock);
+
+			if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) {
+				struct inet6_dev *idev = in6_dev_get(dev);
+
+				if (idev) {
+					(void) ip6_mc_leave_src(sk,mc_lst,idev);
+					__ipv6_dev_mc_dec(idev, &mc_lst->addr);
+					in6_dev_put(idev);
+				}
+				dev_put(dev);
+			}
+			sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
+			return 0;
+		}
+	}
+	write_unlock_bh(&ipv6_sk_mc_lock);
+
+	return -ENOENT;
+}
+
+static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
+{
+	struct net_device *dev = NULL;
+	struct inet6_dev *idev = NULL;
+
+	if (ifindex == 0) {
+		struct rt6_info *rt;
+
+		rt = rt6_lookup(group, NULL, 0, 0);
+		if (rt) {
+			dev = rt->rt6i_dev;
+			dev_hold(dev);
+			dst_release(&rt->u.dst);
+		}
+	} else
+		dev = dev_get_by_index(ifindex);
+
+	if (!dev)
+		return NULL;
+	idev = in6_dev_get(dev);
+	if (!idev) {
+		dev_put(dev);
+		return NULL;
+	}
+	read_lock_bh(&idev->lock);
+	if (idev->dead) {
+		read_unlock_bh(&idev->lock);
+		in6_dev_put(idev);
+		dev_put(dev);
+		return NULL;
+	}
+	return idev;
+}
+
+void ipv6_sock_mc_close(struct sock *sk)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct ipv6_mc_socklist *mc_lst;
+
+	write_lock_bh(&ipv6_sk_mc_lock);
+	while ((mc_lst = np->ipv6_mc_list) != NULL) {
+		struct net_device *dev;
+
+		np->ipv6_mc_list = mc_lst->next;
+		write_unlock_bh(&ipv6_sk_mc_lock);
+
+		dev = dev_get_by_index(mc_lst->ifindex);
+		if (dev) {
+			struct inet6_dev *idev = in6_dev_get(dev);
+
+			if (idev) {
+				(void) ip6_mc_leave_src(sk, mc_lst, idev);
+				__ipv6_dev_mc_dec(idev, &mc_lst->addr);
+				in6_dev_put(idev);
+			}
+			dev_put(dev);
+		}
+
+		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
+
+		write_lock_bh(&ipv6_sk_mc_lock);
+	}
+	write_unlock_bh(&ipv6_sk_mc_lock);
+}
+
+int ip6_mc_source(int add, int omode, struct sock *sk,
+	struct group_source_req *pgsr)
+{
+	struct in6_addr *source, *group;
+	struct ipv6_mc_socklist *pmc;
+	struct net_device *dev;
+	struct inet6_dev *idev;
+	struct ipv6_pinfo *inet6 = inet6_sk(sk);
+	struct ip6_sf_socklist *psl;
+	int i, j, rv;
+	int err;
+
+	if (pgsr->gsr_group.ss_family != AF_INET6 ||
+	    pgsr->gsr_source.ss_family != AF_INET6)
+		return -EINVAL;
+
+	source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
+	group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
+
+	if (!ipv6_addr_is_multicast(group))
+		return -EINVAL;
+
+	idev = ip6_mc_find_dev(group, pgsr->gsr_interface);
+	if (!idev)
+		return -ENODEV;
+	dev = idev->dev;
+
+	err = -EADDRNOTAVAIL;
+
+	for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
+		if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
+			continue;
+		if (ipv6_addr_equal(&pmc->addr, group))
+			break;
+	}
+	if (!pmc)		/* must have a prior join */
+		goto done;
+	/* if a source filter was set, must be the same mode as before */
+	if (pmc->sflist) {
+		if (pmc->sfmode != omode)
+			goto done;
+	} else if (pmc->sfmode != omode) {
+		/* allow mode switches for empty-set filters */
+		ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
+		ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
+		pmc->sfmode = omode;
+	}
+
+	psl = pmc->sflist;
+	if (!add) {
+		if (!psl)
+			goto done;
+		rv = !0;
+		for (i=0; i<psl->sl_count; i++) {
+			rv = memcmp(&psl->sl_addr[i], source,
+				sizeof(struct in6_addr));
+			if (rv == 0)
+				break;
+		}
+		if (rv)		/* source not found */
+			goto done;
+
+		/* update the interface filter */
+		ip6_mc_del_src(idev, group, omode, 1, source, 1);
+
+		for (j=i+1; j<psl->sl_count; j++)
+			psl->sl_addr[j-1] = psl->sl_addr[j];
+		psl->sl_count--;
+		err = 0;
+		goto done;
+	}
+	/* else, add a new source to the filter */
+
+	if (psl && psl->sl_count >= sysctl_mld_max_msf) {
+		err = -ENOBUFS;
+		goto done;
+	}
+	if (!psl || psl->sl_count == psl->sl_max) {
+		struct ip6_sf_socklist *newpsl;
+		int count = IP6_SFBLOCK;
+
+		if (psl)
+			count += psl->sl_max;
+		newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
+			IP6_SFLSIZE(count), GFP_ATOMIC);
+		if (!newpsl) {
+			err = -ENOBUFS;
+			goto done;
+		}
+		newpsl->sl_max = count;
+		newpsl->sl_count = count - IP6_SFBLOCK;
+		if (psl) {
+			for (i=0; i<psl->sl_count; i++)
+				newpsl->sl_addr[i] = psl->sl_addr[i];
+			sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
+		}
+		pmc->sflist = psl = newpsl;
+	}
+	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
+	for (i=0; i<psl->sl_count; i++) {
+		rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
+		if (rv == 0)
+			break;
+	}
+	if (rv == 0)		/* address already there is an error */
+		goto done;
+	for (j=psl->sl_count-1; j>=i; j--)
+		psl->sl_addr[j+1] = psl->sl_addr[j];
+	psl->sl_addr[i] = *source;
+	psl->sl_count++;
+	err = 0;
+	/* update the interface list */
+	ip6_mc_add_src(idev, group, omode, 1, source, 1);
+done:
+	read_unlock_bh(&idev->lock);
+	in6_dev_put(idev);
+	dev_put(dev);
+	return err;
+}
+
+int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
+{
+	struct in6_addr *group;
+	struct ipv6_mc_socklist *pmc;
+	struct net_device *dev;
+	struct inet6_dev *idev;
+	struct ipv6_pinfo *inet6 = inet6_sk(sk);
+	struct ip6_sf_socklist *newpsl, *psl;
+	int i, err;
+
+	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
+
+	if (!ipv6_addr_is_multicast(group))
+		return -EINVAL;
+	if (gsf->gf_fmode != MCAST_INCLUDE &&
+	    gsf->gf_fmode != MCAST_EXCLUDE)
+		return -EINVAL;
+
+	idev = ip6_mc_find_dev(group, gsf->gf_interface);
+
+	if (!idev)
+		return -ENODEV;
+	dev = idev->dev;
+	err = -EADDRNOTAVAIL;
+
+	for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
+		if (pmc->ifindex != gsf->gf_interface)
+			continue;
+		if (ipv6_addr_equal(&pmc->addr, group))
+			break;
+	}
+	if (!pmc)		/* must have a prior join */
+		goto done;
+	if (gsf->gf_numsrc) {
+		newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
+				IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
+		if (!newpsl) {
+			err = -ENOBUFS;
+			goto done;
+		}
+		newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
+		for (i=0; i<newpsl->sl_count; ++i) {
+			struct sockaddr_in6 *psin6;
+
+			psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
+			newpsl->sl_addr[i] = psin6->sin6_addr;
+		}
+		err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
+			newpsl->sl_count, newpsl->sl_addr, 0);
+		if (err) {
+			sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
+			goto done;
+		}
+	} else
+		newpsl = NULL;
+	psl = pmc->sflist;
+	if (psl) {
+		(void) ip6_mc_del_src(idev, group, pmc->sfmode,
+			psl->sl_count, psl->sl_addr, 0);
+		sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
+	} else
+		(void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
+	pmc->sflist = newpsl;
+	pmc->sfmode = gsf->gf_fmode;
+done:
+	read_unlock_bh(&idev->lock);
+	in6_dev_put(idev);
+	dev_put(dev);
+	return err;
+}
+
+int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
+	struct group_filter __user *optval, int __user *optlen)
+{
+	int err, i, count, copycount;
+	struct in6_addr *group;
+	struct ipv6_mc_socklist *pmc;
+	struct inet6_dev *idev;
+	struct net_device *dev;
+	struct ipv6_pinfo *inet6 = inet6_sk(sk);
+	struct ip6_sf_socklist *psl;
+
+	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
+
+	if (!ipv6_addr_is_multicast(group))
+		return -EINVAL;
+
+	idev = ip6_mc_find_dev(group, gsf->gf_interface);
+
+	if (!idev)
+		return -ENODEV;
+
+	dev = idev->dev;
+
+	err = -EADDRNOTAVAIL;
+
+	for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
+		if (pmc->ifindex != gsf->gf_interface)
+			continue;
+		if (ipv6_addr_equal(group, &pmc->addr))
+			break;
+	}
+	if (!pmc)		/* must have a prior join */
+		goto done;
+	gsf->gf_fmode = pmc->sfmode;
+	psl = pmc->sflist;
+	count = psl ? psl->sl_count : 0;
+	read_unlock_bh(&idev->lock);
+	in6_dev_put(idev);
+	dev_put(dev);
+
+	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
+	gsf->gf_numsrc = count;
+	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
+	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
+		return -EFAULT;
+	}
+	for (i=0; i<copycount; i++) {
+		struct sockaddr_in6 *psin6;
+		struct sockaddr_storage ss;
+
+		psin6 = (struct sockaddr_in6 *)&ss;
+		memset(&ss, 0, sizeof(ss));
+		psin6->sin6_family = AF_INET6;
+		psin6->sin6_addr = psl->sl_addr[i];
+	    	if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
+			return -EFAULT;
+	}
+	return 0;
+done:
+	read_unlock_bh(&idev->lock);
+	in6_dev_put(idev);
+	dev_put(dev);
+	return err;
+}
+
+int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
+	struct in6_addr *src_addr)
+{
+	struct ipv6_pinfo *np = inet6_sk(sk);
+	struct ipv6_mc_socklist *mc;
+	struct ip6_sf_socklist *psl;
+	int rv = 1;
+
+	read_lock(&ipv6_sk_mc_lock);
+	for (mc = np->ipv6_mc_list; mc; mc = mc->next) {
+		if (ipv6_addr_equal(&mc->addr, mc_addr))
+			break;
+	}
+	if (!mc) {
+		read_unlock(&ipv6_sk_mc_lock);
+		return 1;
+	}
+	psl = mc->sflist;
+	if (!psl) {
+		rv = mc->sfmode == MCAST_EXCLUDE;
+	} else {
+		int i;
+
+		for (i=0; i<psl->sl_count; i++) {
+			if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
+				break;
+		}
+		if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
+			rv = 0;
+		if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
+			rv = 0;
+	}
+	read_unlock(&ipv6_sk_mc_lock);
+
+	return rv;
+}
+
+static void ma_put(struct ifmcaddr6 *mc)
+{
+	if (atomic_dec_and_test(&mc->mca_refcnt)) {
+		in6_dev_put(mc->idev);
+		kfree(mc);
+	}
+}
+
+static void igmp6_group_added(struct ifmcaddr6 *mc)
+{
+	struct net_device *dev = mc->idev->dev;
+	char buf[MAX_ADDR_LEN];
+
+	spin_lock_bh(&mc->mca_lock);
+	if (!(mc->mca_flags&MAF_LOADED)) {
+		mc->mca_flags |= MAF_LOADED;
+		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
+			dev_mc_add(dev, buf, dev->addr_len, 0);
+	}
+	spin_unlock_bh(&mc->mca_lock);
+
+	if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
+		return;
+
+	if (MLD_V1_SEEN(mc->idev)) {
+		igmp6_join_group(mc);
+		return;
+	}
+	/* else v2 */
+
+	mc->mca_crcount = mc->idev->mc_qrv;
+	mld_ifc_event(mc->idev);
+}
+
+static void igmp6_group_dropped(struct ifmcaddr6 *mc)
+{
+	struct net_device *dev = mc->idev->dev;
+	char buf[MAX_ADDR_LEN];
+
+	spin_lock_bh(&mc->mca_lock);
+	if (mc->mca_flags&MAF_LOADED) {
+		mc->mca_flags &= ~MAF_LOADED;
+		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
+			dev_mc_delete(dev, buf, dev->addr_len, 0);
+	}
+
+	if (mc->mca_flags & MAF_NOREPORT)
+		goto done;
+	spin_unlock_bh(&mc->mca_lock);
+
+	if (!mc->idev->dead)
+		igmp6_leave_group(mc);
+
+	spin_lock_bh(&mc->mca_lock);
+	if (del_timer(&mc->mca_timer))
+		atomic_dec(&mc->mca_refcnt);
+done:
+	ip6_mc_clear_src(mc);
+	spin_unlock_bh(&mc->mca_lock);
+}
+
+/*
+ * deleted ifmcaddr6 manipulation
+ */
+static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
+{
+	struct ifmcaddr6 *pmc;
+
+	/* this is an "ifmcaddr6" for convenience; only the fields below
+	 * are actually used. In particular, the refcnt and users are not
+	 * used for management of the delete list. Using the same structure
+	 * for deleted items allows change reports to use common code with
+	 * non-deleted or query-response MCA's.
+	 */
+	pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
+	if (!pmc)
+		return;
+	memset(pmc, 0, sizeof(*pmc));
+	spin_lock_bh(&im->mca_lock);
+	spin_lock_init(&pmc->mca_lock);
+	pmc->idev = im->idev;
+	in6_dev_hold(idev);
+	pmc->mca_addr = im->mca_addr;
+	pmc->mca_crcount = idev->mc_qrv;
+	pmc->mca_sfmode = im->mca_sfmode;
+	if (pmc->mca_sfmode == MCAST_INCLUDE) {
+		struct ip6_sf_list *psf;
+
+		pmc->mca_tomb = im->mca_tomb;
+		pmc->mca_sources = im->mca_sources;
+		im->mca_tomb = im->mca_sources = NULL;
+		for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
+			psf->sf_crcount = pmc->mca_crcount;
+	}
+	spin_unlock_bh(&im->mca_lock);
+
+	write_lock_bh(&idev->mc_lock);
+	pmc->next = idev->mc_tomb;
+	idev->mc_tomb = pmc;
+	write_unlock_bh(&idev->mc_lock);
+}
+
+static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca)
+{
+	struct ifmcaddr6 *pmc, *pmc_prev;
+	struct ip6_sf_list *psf, *psf_next;
+
+	write_lock_bh(&idev->mc_lock);
+	pmc_prev = NULL;
+	for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
+		if (ipv6_addr_equal(&pmc->mca_addr, pmca))
+			break;
+		pmc_prev = pmc;
+	}
+	if (pmc) {
+		if (pmc_prev)
+			pmc_prev->next = pmc->next;
+		else
+			idev->mc_tomb = pmc->next;
+	}
+	write_unlock_bh(&idev->mc_lock);
+	if (pmc) {
+		for (psf=pmc->mca_tomb; psf; psf=psf_next) {
+			psf_next = psf->sf_next;
+			kfree(psf);
+		}
+		in6_dev_put(pmc->idev);
+		kfree(pmc);
+	}
+}
+
+static void mld_clear_delrec(struct inet6_dev *idev)
+{
+	struct ifmcaddr6 *pmc, *nextpmc;
+
+	write_lock_bh(&idev->mc_lock);
+	pmc = idev->mc_tomb;
+	idev->mc_tomb = NULL;
+	write_unlock_bh(&idev->mc_lock);
+
+	for (; pmc; pmc = nextpmc) {
+		nextpmc = pmc->next;
+		ip6_mc_clear_src(pmc);
+		in6_dev_put(pmc->idev);
+		kfree(pmc);
+	}
+
+	/* clear dead sources, too */
+	read_lock_bh(&idev->lock);
+	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
+		struct ip6_sf_list *psf, *psf_next;
+
+		spin_lock_bh(&pmc->mca_lock);
+		psf = pmc->mca_tomb;
+		pmc->mca_tomb = NULL;
+		spin_unlock_bh(&pmc->mca_lock);
+		for (; psf; psf=psf_next) {
+			psf_next = psf->sf_next;
+			kfree(psf);
+		}
+	}
+	read_unlock_bh(&idev->lock);
+}
+
+
+/*
+ *	device multicast group inc (add if not found)
+ */
+int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr)
+{
+	struct ifmcaddr6 *mc;
+	struct inet6_dev *idev;
+
+	idev = in6_dev_get(dev);
+
+	if (idev == NULL)
+		return -EINVAL;
+
+	write_lock_bh(&idev->lock);
+	if (idev->dead) {
+		write_unlock_bh(&idev->lock);
+		in6_dev_put(idev);
+		return -ENODEV;
+	}
+
+	for (mc = idev->mc_list; mc; mc = mc->next) {
+		if (ipv6_addr_equal(&mc->mca_addr, addr)) {
+			mc->mca_users++;
+			write_unlock_bh(&idev->lock);
+			ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
+				NULL, 0);
+			in6_dev_put(idev);
+			return 0;
+		}
+	}
+
+	/*
+	 *	not found: create a new one.
+	 */
+
+	mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
+
+	if (mc == NULL) {
+		write_unlock_bh(&idev->lock);
+		in6_dev_put(idev);
+		return -ENOMEM;
+	}
+
+	memset(mc, 0, sizeof(struct ifmcaddr6));
+	init_timer(&mc->mca_timer);
+	mc->mca_timer.function = igmp6_timer_handler;
+	mc->mca_timer.data = (unsigned long) mc;
+
+	ipv6_addr_copy(&mc->mca_addr, addr);
+	mc->idev = idev;
+	mc->mca_users = 1;
+	/* mca_stamp should be updated upon changes */
+	mc->mca_cstamp = mc->mca_tstamp = jiffies;
+	atomic_set(&mc->mca_refcnt, 2);
+	spin_lock_init(&mc->mca_lock);
+
+	/* initial mode is (EX, empty) */
+	mc->mca_sfmode = MCAST_EXCLUDE;
+	mc->mca_sfcount[MCAST_EXCLUDE] = 1;
+
+	if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
+	    IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
+		mc->mca_flags |= MAF_NOREPORT;
+
+	mc->next = idev->mc_list;
+	idev->mc_list = mc;
+	write_unlock_bh(&idev->lock);
+
+	mld_del_delrec(idev, &mc->mca_addr);
+	igmp6_group_added(mc);
+	ma_put(mc);
+	return 0;
+}
+
+/*
+ *	device multicast group del
+ */
+int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr)
+{
+	struct ifmcaddr6 *ma, **map;
+
+	write_lock_bh(&idev->lock);
+	for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
+		if (ipv6_addr_equal(&ma->mca_addr, addr)) {
+			if (--ma->mca_users == 0) {
+				*map = ma->next;
+				write_unlock_bh(&idev->lock);
+
+				igmp6_group_dropped(ma);
+
+				ma_put(ma);
+				return 0;
+			}
+			write_unlock_bh(&idev->lock);
+			return 0;
+		}
+	}
+	write_unlock_bh(&idev->lock);
+
+	return -ENOENT;
+}
+
+int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr)
+{
+	struct inet6_dev *idev = in6_dev_get(dev);
+	int err;
+
+	if (!idev)
+		return -ENODEV;
+
+	err = __ipv6_dev_mc_dec(idev, addr);
+
+	in6_dev_put(idev);
+
+	return err;
+}
+
+/*
+ * identify MLD packets for MLD filter exceptions
+ */
+int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
+{
+	struct icmp6hdr *pic;
+
+	if (nexthdr != IPPROTO_ICMPV6)
+		return 0;
+
+	if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
+		return 0;
+
+	pic = (struct icmp6hdr *)skb->h.raw;
+
+	switch (pic->icmp6_type) {
+	case ICMPV6_MGM_QUERY:
+	case ICMPV6_MGM_REPORT:
+	case ICMPV6_MGM_REDUCTION:
+	case ICMPV6_MLD2_REPORT:
+		return 1;
+	default:
+		break;
+	}
+	return 0;
+}
+
+/*
+ *	check if the interface/address pair is valid
+ */
+int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group,
+	struct in6_addr *src_addr)
+{
+	struct inet6_dev *idev;
+	struct ifmcaddr6 *mc;
+	int rv = 0;
+
+	idev = in6_dev_get(dev);
+	if (idev) {
+		read_lock_bh(&idev->lock);
+		for (mc = idev->mc_list; mc; mc=mc->next) {
+			if (ipv6_addr_equal(&mc->mca_addr, group))
+				break;
+		}
+		if (mc) {
+			if (src_addr && !ipv6_addr_any(src_addr)) {
+				struct ip6_sf_list *psf;
+
+				spin_lock_bh(&mc->mca_lock);
+				for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
+					if (ipv6_addr_equal(&psf->sf_addr, src_addr))
+						break;
+				}
+				if (psf)
+					rv = psf->sf_count[MCAST_INCLUDE] ||
+						psf->sf_count[MCAST_EXCLUDE] !=
+						mc->mca_sfcount[MCAST_EXCLUDE];
+				else
+					rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
+				spin_unlock_bh(&mc->mca_lock);
+			} else
+				rv = 1; /* don't filter unspecified source */
+		}
+		read_unlock_bh(&idev->lock);
+		in6_dev_put(idev);
+	}
+	return rv;
+}
+
+static void mld_gq_start_timer(struct inet6_dev *idev)
+{
+	int tv = net_random() % idev->mc_maxdelay;
+
+	idev->mc_gq_running = 1;
+	if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
+		in6_dev_hold(idev);
+}
+
+static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
+{
+	int tv = net_random() % delay;
+
+	if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
+		in6_dev_hold(idev);
+}
+
+/*
+ *	IGMP handling (alias multicast ICMPv6 messages)
+ */
+
+static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
+{
+	unsigned long delay = resptime;
+
+	/* Do not start timer for these addresses */
+	if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
+	    IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
+		return;
+
+	if (del_timer(&ma->mca_timer)) {
+		atomic_dec(&ma->mca_refcnt);
+		delay = ma->mca_timer.expires - jiffies;
+	}
+
+	if (delay >= resptime) {
+		if (resptime)
+			delay = net_random() % resptime;
+		else
+			delay = 1;
+	}
+	ma->mca_timer.expires = jiffies + delay;
+	if (!mod_timer(&ma->mca_timer, jiffies + delay))
+		atomic_inc(&ma->mca_refcnt);
+	ma->mca_flags |= MAF_TIMER_RUNNING;
+}
+
+static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
+	struct in6_addr *srcs)
+{
+	struct ip6_sf_list *psf;
+	int i, scount;
+
+	scount = 0;
+	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
+		if (scount == nsrcs)
+			break;
+		for (i=0; i<nsrcs; i++)
+			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
+				psf->sf_gsresp = 1;
+				scount++;
+				break;
+			}
+	}
+}
+
+int igmp6_event_query(struct sk_buff *skb)
+{
+	struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw;
+	struct ifmcaddr6 *ma;
+	struct in6_addr *group;
+	unsigned long max_delay;
+	struct inet6_dev *idev;
+	struct icmp6hdr *hdr;
+	int group_type;
+	int mark = 0;
+	int len;
+
+	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
+		return -EINVAL;
+
+	/* compute payload length excluding extension headers */
+	len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr);
+	len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h; 
+
+	/* Drop queries with not link local source */
+	if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL))
+		return -EINVAL;
+
+	idev = in6_dev_get(skb->dev);
+
+	if (idev == NULL)
+		return 0;
+
+	hdr = (struct icmp6hdr *) skb->h.raw;
+	group = (struct in6_addr *) (hdr + 1);
+	group_type = ipv6_addr_type(group);
+
+	if (group_type != IPV6_ADDR_ANY &&
+	    !(group_type&IPV6_ADDR_MULTICAST)) {
+		in6_dev_put(idev);
+		return -EINVAL;
+	}
+
+	if (len == 24) {
+		int switchback;
+		/* MLDv1 router present */
+
+		/* Translate milliseconds to jiffies */
+		max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000;
+
+		switchback = (idev->mc_qrv + 1) * max_delay;
+		idev->mc_v1_seen = jiffies + switchback;
+
+		/* cancel the interface change timer */
+		idev->mc_ifc_count = 0;
+		if (del_timer(&idev->mc_ifc_timer))
+			__in6_dev_put(idev);
+		/* clear deleted report items */
+		mld_clear_delrec(idev);
+	} else if (len >= 28) {
+		max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000;
+		if (!max_delay)
+			max_delay = 1;
+		idev->mc_maxdelay = max_delay;
+		if (mlh2->qrv)
+			idev->mc_qrv = mlh2->qrv;
+		if (group_type == IPV6_ADDR_ANY) { /* general query */
+			if (mlh2->nsrcs) {
+				in6_dev_put(idev);
+				return -EINVAL; /* no sources allowed */
+			}
+			mld_gq_start_timer(idev);
+			in6_dev_put(idev);
+			return 0;
+		}
+		/* mark sources to include, if group & source-specific */
+		mark = mlh2->nsrcs != 0;
+	} else {
+		in6_dev_put(idev);
+		return -EINVAL;
+	}
+
+	read_lock_bh(&idev->lock);
+	if (group_type == IPV6_ADDR_ANY) {
+		for (ma = idev->mc_list; ma; ma=ma->next) {
+			spin_lock_bh(&ma->mca_lock);
+			igmp6_group_queried(ma, max_delay);
+			spin_unlock_bh(&ma->mca_lock);
+		}
+	} else {
+		for (ma = idev->mc_list; ma; ma=ma->next) {
+			if (group_type != IPV6_ADDR_ANY &&
+			    !ipv6_addr_equal(group, &ma->mca_addr))
+				continue;
+			spin_lock_bh(&ma->mca_lock);
+			if (ma->mca_flags & MAF_TIMER_RUNNING) {
+				/* gsquery <- gsquery && mark */
+				if (!mark)
+					ma->mca_flags &= ~MAF_GSQUERY;
+			} else {
+				/* gsquery <- mark */
+				if (mark)
+					ma->mca_flags |= MAF_GSQUERY;
+				else
+					ma->mca_flags &= ~MAF_GSQUERY;
+			}
+			if (ma->mca_flags & MAF_GSQUERY)
+				mld_marksources(ma, ntohs(mlh2->nsrcs),
+					mlh2->srcs);
+			igmp6_group_queried(ma, max_delay);
+			spin_unlock_bh(&ma->mca_lock);
+			if (group_type != IPV6_ADDR_ANY)
+				break;
+		}
+	}
+	read_unlock_bh(&idev->lock);
+	in6_dev_put(idev);
+
+	return 0;
+}
+
+
+int igmp6_event_report(struct sk_buff *skb)
+{
+	struct ifmcaddr6 *ma;
+	struct in6_addr *addrp;
+	struct inet6_dev *idev;
+	struct icmp6hdr *hdr;
+	int addr_type;
+
+	/* Our own report looped back. Ignore it. */
+	if (skb->pkt_type == PACKET_LOOPBACK)
+		return 0;
+
+	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
+		return -EINVAL;
+
+	hdr = (struct icmp6hdr*) skb->h.raw;
+
+	/* Drop reports with not link local source */
+	addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr);
+	if (addr_type != IPV6_ADDR_ANY && 
+	    !(addr_type&IPV6_ADDR_LINKLOCAL))
+		return -EINVAL;
+
+	addrp = (struct in6_addr *) (hdr + 1);
+
+	idev = in6_dev_get(skb->dev);
+	if (idev == NULL)
+		return -ENODEV;
+
+	/*
+	 *	Cancel the timer for this group
+	 */
+
+	read_lock_bh(&idev->lock);
+	for (ma = idev->mc_list; ma; ma=ma->next) {
+		if (ipv6_addr_equal(&ma->mca_addr, addrp)) {
+			spin_lock(&ma->mca_lock);
+			if (del_timer(&ma->mca_timer))
+				atomic_dec(&ma->mca_refcnt);
+			ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
+			spin_unlock(&ma->mca_lock);
+			break;
+		}
+	}
+	read_unlock_bh(&idev->lock);
+	in6_dev_put(idev);
+	return 0;
+}
+
+static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
+	int gdeleted, int sdeleted)
+{
+	switch (type) {
+	case MLD2_MODE_IS_INCLUDE:
+	case MLD2_MODE_IS_EXCLUDE:
+		if (gdeleted || sdeleted)
+			return 0;
+		return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
+	case MLD2_CHANGE_TO_INCLUDE:
+		if (gdeleted || sdeleted)
+			return 0;
+		return psf->sf_count[MCAST_INCLUDE] != 0;
+	case MLD2_CHANGE_TO_EXCLUDE:
+		if (gdeleted || sdeleted)
+			return 0;
+		if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
+		    psf->sf_count[MCAST_INCLUDE])
+			return 0;
+		return pmc->mca_sfcount[MCAST_EXCLUDE] ==
+			psf->sf_count[MCAST_EXCLUDE];
+	case MLD2_ALLOW_NEW_SOURCES:
+		if (gdeleted || !psf->sf_crcount)
+			return 0;
+		return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
+	case MLD2_BLOCK_OLD_SOURCES:
+		if (pmc->mca_sfmode == MCAST_INCLUDE)
+			return gdeleted || (psf->sf_crcount && sdeleted);
+		return psf->sf_crcount && !gdeleted && !sdeleted;
+	}
+	return 0;
+}
+
+static int
+mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
+{
+	struct ip6_sf_list *psf;
+	int scount = 0;
+
+	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
+		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
+			continue;
+		scount++;
+	}
+	return scount;
+}
+
+static struct sk_buff *mld_newpack(struct net_device *dev, int size)
+{
+	struct sock *sk = igmp6_socket->sk;
+	struct sk_buff *skb;
+	struct mld2_report *pmr;
+	struct in6_addr addr_buf;
+	int err;
+	u8 ra[8] = { IPPROTO_ICMPV6, 0,
+		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
+		     IPV6_TLV_PADN, 0 };
+
+	/* we assume size > sizeof(ra) here */
+	skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err);
+
+	if (skb == 0)
+		return NULL;
+
+	skb_reserve(skb, LL_RESERVED_SPACE(dev));
+	if (dev->hard_header) {
+		unsigned char ha[MAX_ADDR_LEN];
+
+		ndisc_mc_map(&mld2_all_mcr, ha, dev, 1);
+		if (dev->hard_header(skb, dev, ETH_P_IPV6,ha,NULL,size) < 0) {
+			kfree_skb(skb);
+			return NULL;
+		}
+	}
+
+	if (ipv6_get_lladdr(dev, &addr_buf)) {
+		/* <draft-ietf-magma-mld-source-05.txt>:
+		 * use unspecified address as the source address 
+		 * when a valid link-local address is not available.
+		 */
+		memset(&addr_buf, 0, sizeof(addr_buf));
+	}
+
+	ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0);
+
+	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
+
+	pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr));
+	skb->h.raw = (unsigned char *)pmr;
+	pmr->type = ICMPV6_MLD2_REPORT;
+	pmr->resv1 = 0;
+	pmr->csum = 0;
+	pmr->resv2 = 0;
+	pmr->ngrec = 0;
+	return skb;
+}
+
+static void mld_sendpack(struct sk_buff *skb)
+{
+	struct ipv6hdr *pip6 = skb->nh.ipv6h;
+	struct mld2_report *pmr = (struct mld2_report *)skb->h.raw;
+	int payload_len, mldlen;
+	struct inet6_dev *idev = in6_dev_get(skb->dev);
+	int err;
+
+	IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
+	payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h -
+		sizeof(struct ipv6hdr);
+	mldlen = skb->tail - skb->h.raw;
+	pip6->payload_len = htons(payload_len);
+
+	pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
+		IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
+	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
+		dev_queue_xmit);
+	if (!err) {
+		ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
+		IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
+	} else
+		IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
+
+	if (likely(idev != NULL))
+		in6_dev_put(idev);
+}
+
+static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
+{
+	return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel);
+}
+
+static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
+	int type, struct mld2_grec **ppgr)
+{
+	struct net_device *dev = pmc->idev->dev;
+	struct mld2_report *pmr;
+	struct mld2_grec *pgr;
+
+	if (!skb)
+		skb = mld_newpack(dev, dev->mtu);
+	if (!skb)
+		return NULL;
+	pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
+	pgr->grec_type = type;
+	pgr->grec_auxwords = 0;
+	pgr->grec_nsrcs = 0;
+	pgr->grec_mca = pmc->mca_addr;	/* structure copy */
+	pmr = (struct mld2_report *)skb->h.raw;
+	pmr->ngrec = htons(ntohs(pmr->ngrec)+1);
+	*ppgr = pgr;
+	return skb;
+}
+
+#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
+	skb_tailroom(skb)) : 0)
+
+static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
+	int type, int gdeleted, int sdeleted)
+{
+	struct net_device *dev = pmc->idev->dev;
+	struct mld2_report *pmr;
+	struct mld2_grec *pgr = NULL;
+	struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
+	int scount, first, isquery, truncate;
+
+	if (pmc->mca_flags & MAF_NOREPORT)
+		return skb;
+
+	isquery = type == MLD2_MODE_IS_INCLUDE ||
+		  type == MLD2_MODE_IS_EXCLUDE;
+	truncate = type == MLD2_MODE_IS_EXCLUDE ||
+		    type == MLD2_CHANGE_TO_EXCLUDE;
+
+	psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
+
+	if (!*psf_list) {
+		if (type == MLD2_ALLOW_NEW_SOURCES ||
+		    type == MLD2_BLOCK_OLD_SOURCES)
+			return skb;
+		if (pmc->mca_crcount || isquery) {
+			/* make sure we have room for group header and at
+			 * least one source.
+			 */
+			if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
+			    sizeof(struct in6_addr)) {
+				mld_sendpack(skb);
+				skb = NULL; /* add_grhead will get a new one */
+			}
+			skb = add_grhead(skb, pmc, type, &pgr);
+		}
+		return skb;
+	}
+	pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
+
+	/* EX and TO_EX get a fresh packet, if needed */
+	if (truncate) {
+		if (pmr && pmr->ngrec &&
+		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
+			if (skb)
+				mld_sendpack(skb);
+			skb = mld_newpack(dev, dev->mtu);
+		}
+	}
+	first = 1;
+	scount = 0;
+	psf_prev = NULL;
+	for (psf=*psf_list; psf; psf=psf_next) {
+		struct in6_addr *psrc;
+
+		psf_next = psf->sf_next;
+
+		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
+			psf_prev = psf;
+			continue;
+		}
+
+		/* clear marks on query responses */
+		if (isquery)
+			psf->sf_gsresp = 0;
+
+		if (AVAILABLE(skb) < sizeof(*psrc) +
+		    first*sizeof(struct mld2_grec)) {
+			if (truncate && !first)
+				break;	 /* truncate these */
+			if (pgr)
+				pgr->grec_nsrcs = htons(scount);
+			if (skb)
+				mld_sendpack(skb);
+			skb = mld_newpack(dev, dev->mtu);
+			first = 1;
+			scount = 0;
+		}
+		if (first) {
+			skb = add_grhead(skb, pmc, type, &pgr);
+			first = 0;
+		}
+		psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
+		*psrc = psf->sf_addr;
+		scount++;
+		if ((type == MLD2_ALLOW_NEW_SOURCES ||
+		     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
+			psf->sf_crcount--;
+			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
+				if (psf_prev)
+					psf_prev->sf_next = psf->sf_next;
+				else
+					*psf_list = psf->sf_next;
+				kfree(psf);
+				continue;
+			}
+		}
+		psf_prev = psf;
+	}
+	if (pgr)
+		pgr->grec_nsrcs = htons(scount);
+
+	if (isquery)
+		pmc->mca_flags &= ~MAF_GSQUERY;	/* clear query state */
+	return skb;
+}
+
+static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
+{
+	struct sk_buff *skb = NULL;
+	int type;
+
+	if (!pmc) {
+		read_lock_bh(&idev->lock);
+		for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
+			if (pmc->mca_flags & MAF_NOREPORT)
+				continue;
+			spin_lock_bh(&pmc->mca_lock);
+			if (pmc->mca_sfcount[MCAST_EXCLUDE])
+				type = MLD2_MODE_IS_EXCLUDE;
+			else
+				type = MLD2_MODE_IS_INCLUDE;
+			skb = add_grec(skb, pmc, type, 0, 0);
+			spin_unlock_bh(&pmc->mca_lock);
+		}
+		read_unlock_bh(&idev->lock);
+	} else {
+		spin_lock_bh(&pmc->mca_lock);
+		if (pmc->mca_sfcount[MCAST_EXCLUDE])
+			type = MLD2_MODE_IS_EXCLUDE;
+		else
+			type = MLD2_MODE_IS_INCLUDE;
+		skb = add_grec(skb, pmc, type, 0, 0);
+		spin_unlock_bh(&pmc->mca_lock);
+	}
+	if (skb)
+		mld_sendpack(skb);
+}
+
+/*
+ * remove zero-count source records from a source filter list
+ */
+static void mld_clear_zeros(struct ip6_sf_list **ppsf)
+{
+	struct ip6_sf_list *psf_prev, *psf_next, *psf;
+
+	psf_prev = NULL;
+	for (psf=*ppsf; psf; psf = psf_next) {
+		psf_next = psf->sf_next;
+		if (psf->sf_crcount == 0) {
+			if (psf_prev)
+				psf_prev->sf_next = psf->sf_next;
+			else
+				*ppsf = psf->sf_next;
+			kfree(psf);
+		} else
+			psf_prev = psf;
+	}
+}
+
+static void mld_send_cr(struct inet6_dev *idev)
+{
+	struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
+	struct sk_buff *skb = NULL;
+	int type, dtype;
+
+	read_lock_bh(&idev->lock);
+	write_lock_bh(&idev->mc_lock);
+
+	/* deleted MCA's */
+	pmc_prev = NULL;
+	for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
+		pmc_next = pmc->next;
+		if (pmc->mca_sfmode == MCAST_INCLUDE) {
+			type = MLD2_BLOCK_OLD_SOURCES;
+			dtype = MLD2_BLOCK_OLD_SOURCES;
+			skb = add_grec(skb, pmc, type, 1, 0);
+			skb = add_grec(skb, pmc, dtype, 1, 1);
+		}
+		if (pmc->mca_crcount) {
+			pmc->mca_crcount--;
+			if (pmc->mca_sfmode == MCAST_EXCLUDE) {
+				type = MLD2_CHANGE_TO_INCLUDE;
+				skb = add_grec(skb, pmc, type, 1, 0);
+			}
+			if (pmc->mca_crcount == 0) {
+				mld_clear_zeros(&pmc->mca_tomb);
+				mld_clear_zeros(&pmc->mca_sources);
+			}
+		}
+		if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
+		    !pmc->mca_sources) {
+			if (pmc_prev)
+				pmc_prev->next = pmc_next;
+			else
+				idev->mc_tomb = pmc_next;
+			in6_dev_put(pmc->idev);
+			kfree(pmc);
+		} else
+			pmc_prev = pmc;
+	}
+	write_unlock_bh(&idev->mc_lock);
+
+	/* change recs */
+	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
+		spin_lock_bh(&pmc->mca_lock);
+		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
+			type = MLD2_BLOCK_OLD_SOURCES;
+			dtype = MLD2_ALLOW_NEW_SOURCES;
+		} else {
+			type = MLD2_ALLOW_NEW_SOURCES;
+			dtype = MLD2_BLOCK_OLD_SOURCES;
+		}
+		skb = add_grec(skb, pmc, type, 0, 0);
+		skb = add_grec(skb, pmc, dtype, 0, 1);	/* deleted sources */
+
+		/* filter mode changes */
+		if (pmc->mca_crcount) {
+			pmc->mca_crcount--;
+			if (pmc->mca_sfmode == MCAST_EXCLUDE)
+				type = MLD2_CHANGE_TO_EXCLUDE;
+			else
+				type = MLD2_CHANGE_TO_INCLUDE;
+			skb = add_grec(skb, pmc, type, 0, 0);
+		}
+		spin_unlock_bh(&pmc->mca_lock);
+	}
+	read_unlock_bh(&idev->lock);
+	if (!skb)
+		return;
+	(void) mld_sendpack(skb);
+}
+
+static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
+{
+	struct sock *sk = igmp6_socket->sk;
+	struct inet6_dev *idev;
+        struct sk_buff *skb;
+        struct icmp6hdr *hdr;
+	struct in6_addr *snd_addr;
+	struct in6_addr *addrp;
+	struct in6_addr addr_buf;
+	struct in6_addr all_routers;
+	int err, len, payload_len, full_len;
+	u8 ra[8] = { IPPROTO_ICMPV6, 0,
+		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
+		     IPV6_TLV_PADN, 0 };
+
+	IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS);
+	snd_addr = addr;
+	if (type == ICMPV6_MGM_REDUCTION) {
+		snd_addr = &all_routers;
+		ipv6_addr_all_routers(&all_routers);
+	}
+
+	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
+	payload_len = len + sizeof(ra);
+	full_len = sizeof(struct ipv6hdr) + payload_len;
+
+	skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err);
+
+	if (skb == NULL) {
+		IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
+		return;
+	}
+
+	skb_reserve(skb, LL_RESERVED_SPACE(dev));
+	if (dev->hard_header) {
+		unsigned char ha[MAX_ADDR_LEN];
+		ndisc_mc_map(snd_addr, ha, dev, 1);
+		if (dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, full_len) < 0)
+			goto out;
+	}
+
+	if (ipv6_get_lladdr(dev, &addr_buf)) {
+		/* <draft-ietf-magma-mld-source-05.txt>:
+		 * use unspecified address as the source address 
+		 * when a valid link-local address is not available.
+		 */
+		memset(&addr_buf, 0, sizeof(addr_buf));
+	}
+
+	ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len);
+
+	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
+
+	hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr));
+	memset(hdr, 0, sizeof(struct icmp6hdr));
+	hdr->icmp6_type = type;
+
+	addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr));
+	ipv6_addr_copy(addrp, addr);
+
+	hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len,
+					   IPPROTO_ICMPV6,
+					   csum_partial((__u8 *) hdr, len, 0));
+
+	idev = in6_dev_get(skb->dev);
+
+	err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
+		dev_queue_xmit);
+	if (!err) {
+		if (type == ICMPV6_MGM_REDUCTION)
+			ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
+		else
+			ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES);
+		ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
+		IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
+	} else
+		IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
+
+	if (likely(idev != NULL))
+		in6_dev_put(idev);
+	return;
+
+out:
+	IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
+	kfree_skb(skb);
+}
+
+static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
+	struct in6_addr *psfsrc)
+{
+	struct ip6_sf_list *psf, *psf_prev;
+	int rv = 0;
+
+	psf_prev = NULL;
+	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
+		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
+			break;
+		psf_prev = psf;
+	}
+	if (!psf || psf->sf_count[sfmode] == 0) {
+		/* source filter not found, or count wrong =>  bug */
+		return -ESRCH;
+	}
+	psf->sf_count[sfmode]--;
+	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
+		struct inet6_dev *idev = pmc->idev;
+
+		/* no more filters for this source */
+		if (psf_prev)
+			psf_prev->sf_next = psf->sf_next;
+		else
+			pmc->mca_sources = psf->sf_next;
+		if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
+		    !MLD_V1_SEEN(idev)) {
+			psf->sf_crcount = idev->mc_qrv;
+			psf->sf_next = pmc->mca_tomb;
+			pmc->mca_tomb = psf;
+			rv = 1;
+		} else
+			kfree(psf);
+	}
+	return rv;
+}
+
+static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca,
+			  int sfmode, int sfcount, struct in6_addr *psfsrc,
+			  int delta)
+{
+	struct ifmcaddr6 *pmc;
+	int	changerec = 0;
+	int	i, err;
+
+	if (!idev)
+		return -ENODEV;
+	read_lock_bh(&idev->lock);
+	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
+		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
+			break;
+	}
+	if (!pmc) {
+		/* MCA not found?? bug */
+		read_unlock_bh(&idev->lock);
+		return -ESRCH;
+	}
+	spin_lock_bh(&pmc->mca_lock);
+	sf_markstate(pmc);
+	if (!delta) {
+		if (!pmc->mca_sfcount[sfmode]) {
+			spin_unlock_bh(&pmc->mca_lock);
+			read_unlock_bh(&idev->lock);
+			return -EINVAL;
+		}
+		pmc->mca_sfcount[sfmode]--;
+	}
+	err = 0;
+	for (i=0; i<sfcount; i++) {
+		int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
+
+		changerec |= rv > 0;
+		if (!err && rv < 0)
+			err = rv;
+	}
+	if (pmc->mca_sfmode == MCAST_EXCLUDE &&
+	    pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
+	    pmc->mca_sfcount[MCAST_INCLUDE]) {
+		struct ip6_sf_list *psf;
+
+		/* filter mode change */
+		pmc->mca_sfmode = MCAST_INCLUDE;
+		pmc->mca_crcount = idev->mc_qrv;
+		idev->mc_ifc_count = pmc->mca_crcount;
+		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
+			psf->sf_crcount = 0;
+		mld_ifc_event(pmc->idev);
+	} else if (sf_setstate(pmc) || changerec)
+		mld_ifc_event(pmc->idev);
+	spin_unlock_bh(&pmc->mca_lock);
+	read_unlock_bh(&idev->lock);
+	return err;
+}
+
+/*
+ * Add multicast single-source filter to the interface list
+ */
+static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
+	struct in6_addr *psfsrc, int delta)
+{
+	struct ip6_sf_list *psf, *psf_prev;
+
+	psf_prev = NULL;
+	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
+		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
+			break;
+		psf_prev = psf;
+	}
+	if (!psf) {
+		psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
+		if (!psf)
+			return -ENOBUFS;
+		memset(psf, 0, sizeof(*psf));
+		psf->sf_addr = *psfsrc;
+		if (psf_prev) {
+			psf_prev->sf_next = psf;
+		} else
+			pmc->mca_sources = psf;
+	}
+	psf->sf_count[sfmode]++;
+	return 0;
+}
+
+static void sf_markstate(struct ifmcaddr6 *pmc)
+{
+	struct ip6_sf_list *psf;
+	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
+
+	for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
+		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
+			psf->sf_oldin = mca_xcount ==
+				psf->sf_count[MCAST_EXCLUDE] &&
+				!psf->sf_count[MCAST_INCLUDE];
+		} else
+			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
+}
+
+static int sf_setstate(struct ifmcaddr6 *pmc)
+{
+	struct ip6_sf_list *psf;
+	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
+	int qrv = pmc->idev->mc_qrv;
+	int new_in, rv;
+
+	rv = 0;
+	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
+		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
+			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
+				!psf->sf_count[MCAST_INCLUDE];
+		} else
+			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
+		if (new_in != psf->sf_oldin) {
+			psf->sf_crcount = qrv;
+			rv++;
+		}
+	}
+	return rv;
+}
+
+/*
+ * Add multicast source filter list to the interface list
+ */
+static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca,
+			  int sfmode, int sfcount, struct in6_addr *psfsrc,
+			  int delta)
+{
+	struct ifmcaddr6 *pmc;
+	int	isexclude;
+	int	i, err;
+
+	if (!idev)
+		return -ENODEV;
+	read_lock_bh(&idev->lock);
+	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
+		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
+			break;
+	}
+	if (!pmc) {
+		/* MCA not found?? bug */
+		read_unlock_bh(&idev->lock);
+		return -ESRCH;
+	}
+	spin_lock_bh(&pmc->mca_lock);
+
+	sf_markstate(pmc);
+	isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
+	if (!delta)
+		pmc->mca_sfcount[sfmode]++;
+	err = 0;
+	for (i=0; i<sfcount; i++) {
+		err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
+		if (err)
+			break;
+	}
+	if (err) {
+		int j;
+
+		if (!delta)
+			pmc->mca_sfcount[sfmode]--;
+		for (j=0; j<i; j++)
+			(void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
+	} else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
+		struct inet6_dev *idev = pmc->idev;
+		struct ip6_sf_list *psf;
+
+		/* filter mode change */
+		if (pmc->mca_sfcount[MCAST_EXCLUDE])
+			pmc->mca_sfmode = MCAST_EXCLUDE;
+		else if (pmc->mca_sfcount[MCAST_INCLUDE])
+			pmc->mca_sfmode = MCAST_INCLUDE;
+		/* else no filters; keep old mode for reports */
+
+		pmc->mca_crcount = idev->mc_qrv;
+		idev->mc_ifc_count = pmc->mca_crcount;
+		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
+			psf->sf_crcount = 0;
+		mld_ifc_event(idev);
+	} else if (sf_setstate(pmc))
+		mld_ifc_event(idev);
+	spin_unlock_bh(&pmc->mca_lock);
+	read_unlock_bh(&idev->lock);
+	return err;
+}
+
+static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
+{
+	struct ip6_sf_list *psf, *nextpsf;
+
+	for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
+		nextpsf = psf->sf_next;
+		kfree(psf);
+	}
+	pmc->mca_tomb = NULL;
+	for (psf=pmc->mca_sources; psf; psf=nextpsf) {
+		nextpsf = psf->sf_next;
+		kfree(psf);
+	}
+	pmc->mca_sources = NULL;
+	pmc->mca_sfmode = MCAST_EXCLUDE;
+	pmc->mca_sfcount[MCAST_EXCLUDE] = 0;
+	pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
+}
+
+
+static void igmp6_join_group(struct ifmcaddr6 *ma)
+{
+	unsigned long delay;
+
+	if (ma->mca_flags & MAF_NOREPORT)
+		return;
+
+	igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
+
+	delay = net_random() % IGMP6_UNSOLICITED_IVAL;
+
+	spin_lock_bh(&ma->mca_lock);
+	if (del_timer(&ma->mca_timer)) {
+		atomic_dec(&ma->mca_refcnt);
+		delay = ma->mca_timer.expires - jiffies;
+	}
+
+	if (!mod_timer(&ma->mca_timer, jiffies + delay))
+		atomic_inc(&ma->mca_refcnt);
+	ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
+	spin_unlock_bh(&ma->mca_lock);
+}
+
+static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
+			    struct inet6_dev *idev)
+{
+	int err;
+
+	if (iml->sflist == 0) {
+		/* any-source empty exclude case */
+		return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
+	}
+	err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
+		iml->sflist->sl_count, iml->sflist->sl_addr, 0);
+	sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
+	iml->sflist = NULL;
+	return err;
+}
+
+static void igmp6_leave_group(struct ifmcaddr6 *ma)
+{
+	if (MLD_V1_SEEN(ma->idev)) {
+		if (ma->mca_flags & MAF_LAST_REPORTER)
+			igmp6_send(&ma->mca_addr, ma->idev->dev,
+				ICMPV6_MGM_REDUCTION);
+	} else {
+		mld_add_delrec(ma->idev, ma);
+		mld_ifc_event(ma->idev);
+	}
+}
+
+static void mld_gq_timer_expire(unsigned long data)
+{
+	struct inet6_dev *idev = (struct inet6_dev *)data;
+
+	idev->mc_gq_running = 0;
+	mld_send_report(idev, NULL);
+	__in6_dev_put(idev);
+}
+
+static void mld_ifc_timer_expire(unsigned long data)
+{
+	struct inet6_dev *idev = (struct inet6_dev *)data;
+
+	mld_send_cr(idev);
+	if (idev->mc_ifc_count) {
+		idev->mc_ifc_count--;
+		if (idev->mc_ifc_count)
+			mld_ifc_start_timer(idev, idev->mc_maxdelay);
+	}
+	__in6_dev_put(idev);
+}
+
+static void mld_ifc_event(struct inet6_dev *idev)
+{
+	if (MLD_V1_SEEN(idev))
+		return;
+	idev->mc_ifc_count = idev->mc_qrv;
+	mld_ifc_start_timer(idev, 1);
+}
+
+
+static void igmp6_timer_handler(unsigned long data)
+{
+	struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
+
+	if (MLD_V1_SEEN(ma->idev))
+		igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
+	else
+		mld_send_report(ma->idev, ma);
+
+	spin_lock(&ma->mca_lock);
+	ma->mca_flags |=  MAF_LAST_REPORTER;
+	ma->mca_flags &= ~MAF_TIMER_RUNNING;
+	spin_unlock(&ma->mca_lock);
+	ma_put(ma);
+}
+
+/* Device going down */
+
+void ipv6_mc_down(struct inet6_dev *idev)
+{
+	struct ifmcaddr6 *i;
+
+	/* Withdraw multicast list */
+
+	read_lock_bh(&idev->lock);
+	idev->mc_ifc_count = 0;
+	if (del_timer(&idev->mc_ifc_timer))
+		__in6_dev_put(idev);
+	idev->mc_gq_running = 0;
+	if (del_timer(&idev->mc_gq_timer))
+		__in6_dev_put(idev);
+
+	for (i = idev->mc_list; i; i=i->next)
+		igmp6_group_dropped(i);
+	read_unlock_bh(&idev->lock);
+
+	mld_clear_delrec(idev);
+}
+
+
+/* Device going up */
+
+void ipv6_mc_up(struct inet6_dev *idev)
+{
+	struct ifmcaddr6 *i;
+
+	/* Install multicast list, except for all-nodes (already installed) */
+
+	read_lock_bh(&idev->lock);
+	for (i = idev->mc_list; i; i=i->next)
+		igmp6_group_added(i);
+	read_unlock_bh(&idev->lock);
+}
+
+/* IPv6 device initialization. */
+
+void ipv6_mc_init_dev(struct inet6_dev *idev)
+{
+	struct in6_addr maddr;
+
+	write_lock_bh(&idev->lock);
+	rwlock_init(&idev->mc_lock);
+	idev->mc_gq_running = 0;
+	init_timer(&idev->mc_gq_timer);
+	idev->mc_gq_timer.data = (unsigned long) idev;
+	idev->mc_gq_timer.function = &mld_gq_timer_expire;
+	idev->mc_tomb = NULL;
+	idev->mc_ifc_count = 0;
+	init_timer(&idev->mc_ifc_timer);
+	idev->mc_ifc_timer.data = (unsigned long) idev;
+	idev->mc_ifc_timer.function = &mld_ifc_timer_expire;
+	idev->mc_qrv = MLD_QRV_DEFAULT;
+	idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
+	idev->mc_v1_seen = 0;
+	write_unlock_bh(&idev->lock);
+
+	/* Add all-nodes address. */
+	ipv6_addr_all_nodes(&maddr);
+	ipv6_dev_mc_inc(idev->dev, &maddr);
+}
+
+/*
+ *	Device is about to be destroyed: clean up.
+ */
+
+void ipv6_mc_destroy_dev(struct inet6_dev *idev)
+{
+	struct ifmcaddr6 *i;
+	struct in6_addr maddr;
+
+	/* Deactivate timers */
+	ipv6_mc_down(idev);
+
+	/* Delete all-nodes address. */
+	ipv6_addr_all_nodes(&maddr);
+
+	/* We cannot call ipv6_dev_mc_dec() directly, our caller in
+	 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
+	 * fail.
+	 */
+	__ipv6_dev_mc_dec(idev, &maddr);
+
+	if (idev->cnf.forwarding) {
+		ipv6_addr_all_routers(&maddr);
+		__ipv6_dev_mc_dec(idev, &maddr);
+	}
+
+	write_lock_bh(&idev->lock);
+	while ((i = idev->mc_list) != NULL) {
+		idev->mc_list = i->next;
+		write_unlock_bh(&idev->lock);
+
+		igmp6_group_dropped(i);
+		ma_put(i);
+
+		write_lock_bh(&idev->lock);
+	}
+	write_unlock_bh(&idev->lock);
+}
+
+#ifdef CONFIG_PROC_FS
+struct igmp6_mc_iter_state {
+	struct net_device *dev;
+	struct inet6_dev *idev;
+};
+
+#define igmp6_mc_seq_private(seq)	((struct igmp6_mc_iter_state *)(seq)->private)
+
+static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
+{
+	struct ifmcaddr6 *im = NULL;
+	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
+
+	for (state->dev = dev_base, state->idev = NULL;
+	     state->dev; 
+	     state->dev = state->dev->next) {
+		struct inet6_dev *idev;
+		idev = in6_dev_get(state->dev);
+		if (!idev)
+			continue;
+		read_lock_bh(&idev->lock);
+		im = idev->mc_list;
+		if (im) {
+			state->idev = idev;
+			break;
+		}
+		read_unlock_bh(&idev->lock);
+		in6_dev_put(idev);
+	}
+	return im;
+}
+
+static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
+{
+	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
+
+	im = im->next;
+	while (!im) {
+		if (likely(state->idev != NULL)) {
+			read_unlock_bh(&state->idev->lock);
+			in6_dev_put(state->idev);
+		}
+		state->dev = state->dev->next;
+		if (!state->dev) {
+			state->idev = NULL;
+			break;
+		}
+		state->idev = in6_dev_get(state->dev);
+		if (!state->idev)
+			continue;
+		read_lock_bh(&state->idev->lock);
+		im = state->idev->mc_list;
+	}
+	return im;
+}
+
+static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
+{
+	struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
+	if (im)
+		while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
+			--pos;
+	return pos ? NULL : im;
+}
+
+static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	read_lock(&dev_base_lock);
+	return igmp6_mc_get_idx(seq, *pos);
+}
+
+static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct ifmcaddr6 *im;
+	im = igmp6_mc_get_next(seq, v);
+	++*pos;
+	return im;
+}
+
+static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
+{
+	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
+	if (likely(state->idev != NULL)) {
+		read_unlock_bh(&state->idev->lock);
+		in6_dev_put(state->idev);
+		state->idev = NULL;
+	}
+	state->dev = NULL;
+	read_unlock(&dev_base_lock);
+}
+
+static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
+{
+	struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
+	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
+
+	seq_printf(seq,
+		   "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n", 
+		   state->dev->ifindex, state->dev->name,
+		   NIP6(im->mca_addr),
+		   im->mca_users, im->mca_flags,
+		   (im->mca_flags&MAF_TIMER_RUNNING) ?
+		   jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
+	return 0;
+}
+
+static struct seq_operations igmp6_mc_seq_ops = {
+	.start	=	igmp6_mc_seq_start,
+	.next	=	igmp6_mc_seq_next,
+	.stop	=	igmp6_mc_seq_stop,
+	.show	=	igmp6_mc_seq_show,
+};
+
+static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	int rc = -ENOMEM;
+	struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
+
+	if (!s)
+		goto out;
+
+	rc = seq_open(file, &igmp6_mc_seq_ops);
+	if (rc)
+		goto out_kfree;
+
+	seq = file->private_data;
+	seq->private = s;
+	memset(s, 0, sizeof(*s));
+out:
+	return rc;
+out_kfree:
+	kfree(s);
+	goto out;
+}
+
+static struct file_operations igmp6_mc_seq_fops = {
+	.owner		=	THIS_MODULE,
+	.open		=	igmp6_mc_seq_open,
+	.read		=	seq_read,
+	.llseek		=	seq_lseek,
+	.release	=	seq_release_private,
+};
+
+struct igmp6_mcf_iter_state {
+	struct net_device *dev;
+	struct inet6_dev *idev;
+	struct ifmcaddr6 *im;
+};
+
+#define igmp6_mcf_seq_private(seq)	((struct igmp6_mcf_iter_state *)(seq)->private)
+
+static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
+{
+	struct ip6_sf_list *psf = NULL;
+	struct ifmcaddr6 *im = NULL;
+	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
+
+	for (state->dev = dev_base, state->idev = NULL, state->im = NULL;
+	     state->dev; 
+	     state->dev = state->dev->next) {
+		struct inet6_dev *idev;
+		idev = in6_dev_get(state->dev);
+		if (unlikely(idev == NULL))
+			continue;
+		read_lock_bh(&idev->lock);
+		im = idev->mc_list;
+		if (likely(im != NULL)) {
+			spin_lock_bh(&im->mca_lock);
+			psf = im->mca_sources;
+			if (likely(psf != NULL)) {
+				state->im = im;
+				state->idev = idev;
+				break;
+			}
+			spin_unlock_bh(&im->mca_lock);
+		}
+		read_unlock_bh(&idev->lock);
+		in6_dev_put(idev);
+	}
+	return psf;
+}
+
+static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
+{
+	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
+
+	psf = psf->sf_next;
+	while (!psf) {
+		spin_unlock_bh(&state->im->mca_lock);
+		state->im = state->im->next;
+		while (!state->im) {
+			if (likely(state->idev != NULL)) {
+				read_unlock_bh(&state->idev->lock);
+				in6_dev_put(state->idev);
+			}
+			state->dev = state->dev->next;
+			if (!state->dev) {
+				state->idev = NULL;
+				goto out;
+			}
+			state->idev = in6_dev_get(state->dev);
+			if (!state->idev)
+				continue;
+			read_lock_bh(&state->idev->lock);
+			state->im = state->idev->mc_list;
+		}
+		if (!state->im)
+			break;
+		spin_lock_bh(&state->im->mca_lock);
+		psf = state->im->mca_sources;
+	}
+out:
+	return psf;
+}
+
+static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
+{
+	struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
+	if (psf)
+		while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
+			--pos;
+	return pos ? NULL : psf;
+}
+
+static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	read_lock(&dev_base_lock);
+	return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct ip6_sf_list *psf;
+	if (v == SEQ_START_TOKEN)
+		psf = igmp6_mcf_get_first(seq);
+	else
+		psf = igmp6_mcf_get_next(seq, v);
+	++*pos;
+	return psf;
+}
+
+static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
+{
+	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
+	if (likely(state->im != NULL)) {
+		spin_unlock_bh(&state->im->mca_lock);
+		state->im = NULL;
+	}
+	if (likely(state->idev != NULL)) {
+		read_unlock_bh(&state->idev->lock);
+		in6_dev_put(state->idev);
+		state->idev = NULL;
+	}
+	state->dev = NULL;
+	read_unlock(&dev_base_lock);
+}
+
+static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
+{
+	struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
+	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
+
+	if (v == SEQ_START_TOKEN) {
+		seq_printf(seq, 
+			   "%3s %6s "
+			   "%32s %32s %6s %6s\n", "Idx",
+			   "Device", "Multicast Address",
+			   "Source Address", "INC", "EXC");
+	} else {
+		seq_printf(seq,
+			   "%3d %6.6s "
+			   "%04x%04x%04x%04x%04x%04x%04x%04x "
+			   "%04x%04x%04x%04x%04x%04x%04x%04x "
+			   "%6lu %6lu\n",
+			   state->dev->ifindex, state->dev->name,
+			   NIP6(state->im->mca_addr),
+			   NIP6(psf->sf_addr),
+			   psf->sf_count[MCAST_INCLUDE],
+			   psf->sf_count[MCAST_EXCLUDE]);
+	}
+	return 0;
+}
+
+static struct seq_operations igmp6_mcf_seq_ops = {
+	.start	=	igmp6_mcf_seq_start,
+	.next	=	igmp6_mcf_seq_next,
+	.stop	=	igmp6_mcf_seq_stop,
+	.show	=	igmp6_mcf_seq_show,
+};
+
+static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
+{
+	struct seq_file *seq;
+	int rc = -ENOMEM;
+	struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);
+	
+	if (!s)
+		goto out;
+
+	rc = seq_open(file, &igmp6_mcf_seq_ops);
+	if (rc)
+		goto out_kfree;
+
+	seq = file->private_data;
+	seq->private = s;
+	memset(s, 0, sizeof(*s));
+out:
+	return rc;
+out_kfree:
+	kfree(s);
+	goto out;
+}
+
+static struct file_operations igmp6_mcf_seq_fops = {
+	.owner		=	THIS_MODULE,
+	.open		=	igmp6_mcf_seq_open,
+	.read		=	seq_read,
+	.llseek		=	seq_lseek,
+	.release	=	seq_release_private,
+};
+#endif
+
+int __init igmp6_init(struct net_proto_family *ops)
+{
+	struct ipv6_pinfo *np;
+	struct sock *sk;
+	int err;
+
+	err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket);
+	if (err < 0) {
+		printk(KERN_ERR
+		       "Failed to initialize the IGMP6 control socket (err %d).\n",
+		       err);
+		igmp6_socket = NULL; /* For safety. */
+		return err;
+	}
+
+	sk = igmp6_socket->sk;
+	sk->sk_allocation = GFP_ATOMIC;
+	sk->sk_prot->unhash(sk);
+
+	np = inet6_sk(sk);
+	np->hop_limit = 1;
+
+#ifdef CONFIG_PROC_FS
+	proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops);
+	proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops);
+#endif
+
+	return 0;
+}
+
+void igmp6_cleanup(void)
+{
+	sock_release(igmp6_socket);
+	igmp6_socket = NULL; /* for safety */
+
+#ifdef CONFIG_PROC_FS
+	proc_net_remove("mcfilter6");
+	proc_net_remove("igmp6");
+#endif
+}