Initial import

1 files changed, 2512 insertions, 0 deletions

diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
new file mode 100644
index 000000000..74ceb73c1
--- /dev/null
+++ b/net/ipv6/ip6mr.c
@@ -0,0 +1,2512 @@
+/*
+ *	Linux IPv6 multicast routing support for BSD pim6sd
+ *	Based on net/ipv4/ipmr.c.
+ *
+ *	(c) 2004 Mickael Hoerdt, <hoerdt@clarinet.u-strasbg.fr>
+ *		LSIIT Laboratory, Strasbourg, France
+ *	(c) 2004 Jean-Philippe Andriot, <jean-philippe.andriot@6WIND.com>
+ *		6WIND, Paris, France
+ *	Copyright (C)2007,2008 USAGI/WIDE Project
+ *		YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
+ *
+ *	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.
+ *
+ */
+
+#include <asm/uaccess.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/fcntl.h>
+#include <linux/stat.h>
+#include <linux/socket.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/compat.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/raw.h>
+#include <linux/notifier.h>
+#include <linux/if_arp.h>
+#include <net/checksum.h>
+#include <net/netlink.h>
+#include <net/fib_rules.h>
+
+#include <net/ipv6.h>
+#include <net/ip6_route.h>
+#include <linux/mroute6.h>
+#include <linux/pim.h>
+#include <net/addrconf.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/export.h>
+#include <net/ip6_checksum.h>
+#include <linux/netconf.h>
+
+struct mr6_table {
+	struct list_head	list;
+	possible_net_t		net;
+	u32			id;
+	struct sock		*mroute6_sk;
+	struct timer_list	ipmr_expire_timer;
+	struct list_head	mfc6_unres_queue;
+	struct list_head	mfc6_cache_array[MFC6_LINES];
+	struct mif_device	vif6_table[MAXMIFS];
+	int			maxvif;
+	atomic_t		cache_resolve_queue_len;
+	bool			mroute_do_assert;
+	bool			mroute_do_pim;
+#ifdef CONFIG_IPV6_PIMSM_V2
+	int			mroute_reg_vif_num;
+#endif
+};
+
+struct ip6mr_rule {
+	struct fib_rule		common;
+};
+
+struct ip6mr_result {
+	struct mr6_table	*mrt;
+};
+
+/* Big lock, protecting vif table, mrt cache and mroute socket state.
+   Note that the changes are semaphored via rtnl_lock.
+ */
+
+static DEFINE_RWLOCK(mrt_lock);
+
+/*
+ *	Multicast router control variables
+ */
+
+#define MIF_EXISTS(_mrt, _idx) ((_mrt)->vif6_table[_idx].dev != NULL)
+
+/* Special spinlock for queue of unresolved entries */
+static DEFINE_SPINLOCK(mfc_unres_lock);
+
+/* We return to original Alan's scheme. Hash table of resolved
+   entries is changed only in process context and protected
+   with weak lock mrt_lock. Queue of unresolved entries is protected
+   with strong spinlock mfc_unres_lock.
+
+   In this case data path is free of exclusive locks at all.
+ */
+
+static struct kmem_cache *mrt_cachep __read_mostly;
+
+static struct mr6_table *ip6mr_new_table(struct net *net, u32 id);
+static void ip6mr_free_table(struct mr6_table *mrt);
+
+static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
+			   struct sk_buff *skb, struct mfc6_cache *cache);
+static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
+			      mifi_t mifi, int assert);
+static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
+			       struct mfc6_cache *c, struct rtmsg *rtm);
+static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
+			      int cmd);
+static int ip6mr_rtm_dumproute(struct sk_buff *skb,
+			       struct netlink_callback *cb);
+static void mroute_clean_tables(struct mr6_table *mrt);
+static void ipmr_expire_process(unsigned long arg);
+
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+#define ip6mr_for_each_table(mrt, net) \
+	list_for_each_entry_rcu(mrt, &net->ipv6.mr6_tables, list)
+
+static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
+{
+	struct mr6_table *mrt;
+
+	ip6mr_for_each_table(mrt, net) {
+		if (mrt->id == id)
+			return mrt;
+	}
+	return NULL;
+}
+
+static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
+			    struct mr6_table **mrt)
+{
+	int err;
+	struct ip6mr_result res;
+	struct fib_lookup_arg arg = {
+		.result = &res,
+		.flags = FIB_LOOKUP_NOREF,
+	};
+
+	err = fib_rules_lookup(net->ipv6.mr6_rules_ops,
+			       flowi6_to_flowi(flp6), 0, &arg);
+	if (err < 0)
+		return err;
+	*mrt = res.mrt;
+	return 0;
+}
+
+static int ip6mr_rule_action(struct fib_rule *rule, struct flowi *flp,
+			     int flags, struct fib_lookup_arg *arg)
+{
+	struct ip6mr_result *res = arg->result;
+	struct mr6_table *mrt;
+
+	switch (rule->action) {
+	case FR_ACT_TO_TBL:
+		break;
+	case FR_ACT_UNREACHABLE:
+		return -ENETUNREACH;
+	case FR_ACT_PROHIBIT:
+		return -EACCES;
+	case FR_ACT_BLACKHOLE:
+	default:
+		return -EINVAL;
+	}
+
+	mrt = ip6mr_get_table(rule->fr_net, rule->table);
+	if (!mrt)
+		return -EAGAIN;
+	res->mrt = mrt;
+	return 0;
+}
+
+static int ip6mr_rule_match(struct fib_rule *rule, struct flowi *flp, int flags)
+{
+	return 1;
+}
+
+static const struct nla_policy ip6mr_rule_policy[FRA_MAX + 1] = {
+	FRA_GENERIC_POLICY,
+};
+
+static int ip6mr_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
+				struct fib_rule_hdr *frh, struct nlattr **tb)
+{
+	return 0;
+}
+
+static int ip6mr_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
+			      struct nlattr **tb)
+{
+	return 1;
+}
+
+static int ip6mr_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
+			   struct fib_rule_hdr *frh)
+{
+	frh->dst_len = 0;
+	frh->src_len = 0;
+	frh->tos     = 0;
+	return 0;
+}
+
+static const struct fib_rules_ops __net_initconst ip6mr_rules_ops_template = {
+	.family		= RTNL_FAMILY_IP6MR,
+	.rule_size	= sizeof(struct ip6mr_rule),
+	.addr_size	= sizeof(struct in6_addr),
+	.action		= ip6mr_rule_action,
+	.match		= ip6mr_rule_match,
+	.configure	= ip6mr_rule_configure,
+	.compare	= ip6mr_rule_compare,
+	.default_pref	= fib_default_rule_pref,
+	.fill		= ip6mr_rule_fill,
+	.nlgroup	= RTNLGRP_IPV6_RULE,
+	.policy		= ip6mr_rule_policy,
+	.owner		= THIS_MODULE,
+};
+
+static int __net_init ip6mr_rules_init(struct net *net)
+{
+	struct fib_rules_ops *ops;
+	struct mr6_table *mrt;
+	int err;
+
+	ops = fib_rules_register(&ip6mr_rules_ops_template, net);
+	if (IS_ERR(ops))
+		return PTR_ERR(ops);
+
+	INIT_LIST_HEAD(&net->ipv6.mr6_tables);
+
+	mrt = ip6mr_new_table(net, RT6_TABLE_DFLT);
+	if (!mrt) {
+		err = -ENOMEM;
+		goto err1;
+	}
+
+	err = fib_default_rule_add(ops, 0x7fff, RT6_TABLE_DFLT, 0);
+	if (err < 0)
+		goto err2;
+
+	net->ipv6.mr6_rules_ops = ops;
+	return 0;
+
+err2:
+	ip6mr_free_table(mrt);
+err1:
+	fib_rules_unregister(ops);
+	return err;
+}
+
+static void __net_exit ip6mr_rules_exit(struct net *net)
+{
+	struct mr6_table *mrt, *next;
+
+	rtnl_lock();
+	list_for_each_entry_safe(mrt, next, &net->ipv6.mr6_tables, list) {
+		list_del(&mrt->list);
+		ip6mr_free_table(mrt);
+	}
+	fib_rules_unregister(net->ipv6.mr6_rules_ops);
+	rtnl_unlock();
+}
+#else
+#define ip6mr_for_each_table(mrt, net) \
+	for (mrt = net->ipv6.mrt6; mrt; mrt = NULL)
+
+static struct mr6_table *ip6mr_get_table(struct net *net, u32 id)
+{
+	return net->ipv6.mrt6;
+}
+
+static int ip6mr_fib_lookup(struct net *net, struct flowi6 *flp6,
+			    struct mr6_table **mrt)
+{
+	*mrt = net->ipv6.mrt6;
+	return 0;
+}
+
+static int __net_init ip6mr_rules_init(struct net *net)
+{
+	net->ipv6.mrt6 = ip6mr_new_table(net, RT6_TABLE_DFLT);
+	return net->ipv6.mrt6 ? 0 : -ENOMEM;
+}
+
+static void __net_exit ip6mr_rules_exit(struct net *net)
+{
+	rtnl_lock();
+	ip6mr_free_table(net->ipv6.mrt6);
+	net->ipv6.mrt6 = NULL;
+	rtnl_unlock();
+}
+#endif
+
+static struct mr6_table *ip6mr_new_table(struct net *net, u32 id)
+{
+	struct mr6_table *mrt;
+	unsigned int i;
+
+	mrt = ip6mr_get_table(net, id);
+	if (mrt)
+		return mrt;
+
+	mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
+	if (!mrt)
+		return NULL;
+	mrt->id = id;
+	write_pnet(&mrt->net, net);
+
+	/* Forwarding cache */
+	for (i = 0; i < MFC6_LINES; i++)
+		INIT_LIST_HEAD(&mrt->mfc6_cache_array[i]);
+
+	INIT_LIST_HEAD(&mrt->mfc6_unres_queue);
+
+	setup_timer(&mrt->ipmr_expire_timer, ipmr_expire_process,
+		    (unsigned long)mrt);
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+	mrt->mroute_reg_vif_num = -1;
+#endif
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+	list_add_tail_rcu(&mrt->list, &net->ipv6.mr6_tables);
+#endif
+	return mrt;
+}
+
+static void ip6mr_free_table(struct mr6_table *mrt)
+{
+	del_timer_sync(&mrt->ipmr_expire_timer);
+	mroute_clean_tables(mrt);
+	kfree(mrt);
+}
+
+#ifdef CONFIG_PROC_FS
+
+struct ipmr_mfc_iter {
+	struct seq_net_private p;
+	struct mr6_table *mrt;
+	struct list_head *cache;
+	int ct;
+};
+
+
+static struct mfc6_cache *ipmr_mfc_seq_idx(struct net *net,
+					   struct ipmr_mfc_iter *it, loff_t pos)
+{
+	struct mr6_table *mrt = it->mrt;
+	struct mfc6_cache *mfc;
+
+	read_lock(&mrt_lock);
+	for (it->ct = 0; it->ct < MFC6_LINES; it->ct++) {
+		it->cache = &mrt->mfc6_cache_array[it->ct];
+		list_for_each_entry(mfc, it->cache, list)
+			if (pos-- == 0)
+				return mfc;
+	}
+	read_unlock(&mrt_lock);
+
+	spin_lock_bh(&mfc_unres_lock);
+	it->cache = &mrt->mfc6_unres_queue;
+	list_for_each_entry(mfc, it->cache, list)
+		if (pos-- == 0)
+			return mfc;
+	spin_unlock_bh(&mfc_unres_lock);
+
+	it->cache = NULL;
+	return NULL;
+}
+
+/*
+ *	The /proc interfaces to multicast routing /proc/ip6_mr_cache /proc/ip6_mr_vif
+ */
+
+struct ipmr_vif_iter {
+	struct seq_net_private p;
+	struct mr6_table *mrt;
+	int ct;
+};
+
+static struct mif_device *ip6mr_vif_seq_idx(struct net *net,
+					    struct ipmr_vif_iter *iter,
+					    loff_t pos)
+{
+	struct mr6_table *mrt = iter->mrt;
+
+	for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) {
+		if (!MIF_EXISTS(mrt, iter->ct))
+			continue;
+		if (pos-- == 0)
+			return &mrt->vif6_table[iter->ct];
+	}
+	return NULL;
+}
+
+static void *ip6mr_vif_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(mrt_lock)
+{
+	struct ipmr_vif_iter *iter = seq->private;
+	struct net *net = seq_file_net(seq);
+	struct mr6_table *mrt;
+
+	mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+	if (!mrt)
+		return ERR_PTR(-ENOENT);
+
+	iter->mrt = mrt;
+
+	read_lock(&mrt_lock);
+	return *pos ? ip6mr_vif_seq_idx(net, seq->private, *pos - 1)
+		: SEQ_START_TOKEN;
+}
+
+static void *ip6mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct ipmr_vif_iter *iter = seq->private;
+	struct net *net = seq_file_net(seq);
+	struct mr6_table *mrt = iter->mrt;
+
+	++*pos;
+	if (v == SEQ_START_TOKEN)
+		return ip6mr_vif_seq_idx(net, iter, 0);
+
+	while (++iter->ct < mrt->maxvif) {
+		if (!MIF_EXISTS(mrt, iter->ct))
+			continue;
+		return &mrt->vif6_table[iter->ct];
+	}
+	return NULL;
+}
+
+static void ip6mr_vif_seq_stop(struct seq_file *seq, void *v)
+	__releases(mrt_lock)
+{
+	read_unlock(&mrt_lock);
+}
+
+static int ip6mr_vif_seq_show(struct seq_file *seq, void *v)
+{
+	struct ipmr_vif_iter *iter = seq->private;
+	struct mr6_table *mrt = iter->mrt;
+
+	if (v == SEQ_START_TOKEN) {
+		seq_puts(seq,
+			 "Interface      BytesIn  PktsIn  BytesOut PktsOut Flags\n");
+	} else {
+		const struct mif_device *vif = v;
+		const char *name = vif->dev ? vif->dev->name : "none";
+
+		seq_printf(seq,
+			   "%2td %-10s %8ld %7ld  %8ld %7ld %05X\n",
+			   vif - mrt->vif6_table,
+			   name, vif->bytes_in, vif->pkt_in,
+			   vif->bytes_out, vif->pkt_out,
+			   vif->flags);
+	}
+	return 0;
+}
+
+static const struct seq_operations ip6mr_vif_seq_ops = {
+	.start = ip6mr_vif_seq_start,
+	.next  = ip6mr_vif_seq_next,
+	.stop  = ip6mr_vif_seq_stop,
+	.show  = ip6mr_vif_seq_show,
+};
+
+static int ip6mr_vif_open(struct inode *inode, struct file *file)
+{
+	return seq_open_net(inode, file, &ip6mr_vif_seq_ops,
+			    sizeof(struct ipmr_vif_iter));
+}
+
+static const struct file_operations ip6mr_vif_fops = {
+	.owner	 = THIS_MODULE,
+	.open    = ip6mr_vif_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release_net,
+};
+
+static void *ipmr_mfc_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	struct ipmr_mfc_iter *it = seq->private;
+	struct net *net = seq_file_net(seq);
+	struct mr6_table *mrt;
+
+	mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+	if (!mrt)
+		return ERR_PTR(-ENOENT);
+
+	it->mrt = mrt;
+	return *pos ? ipmr_mfc_seq_idx(net, seq->private, *pos - 1)
+		: SEQ_START_TOKEN;
+}
+
+static void *ipmr_mfc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct mfc6_cache *mfc = v;
+	struct ipmr_mfc_iter *it = seq->private;
+	struct net *net = seq_file_net(seq);
+	struct mr6_table *mrt = it->mrt;
+
+	++*pos;
+
+	if (v == SEQ_START_TOKEN)
+		return ipmr_mfc_seq_idx(net, seq->private, 0);
+
+	if (mfc->list.next != it->cache)
+		return list_entry(mfc->list.next, struct mfc6_cache, list);
+
+	if (it->cache == &mrt->mfc6_unres_queue)
+		goto end_of_list;
+
+	BUG_ON(it->cache != &mrt->mfc6_cache_array[it->ct]);
+
+	while (++it->ct < MFC6_LINES) {
+		it->cache = &mrt->mfc6_cache_array[it->ct];
+		if (list_empty(it->cache))
+			continue;
+		return list_first_entry(it->cache, struct mfc6_cache, list);
+	}
+
+	/* exhausted cache_array, show unresolved */
+	read_unlock(&mrt_lock);
+	it->cache = &mrt->mfc6_unres_queue;
+	it->ct = 0;
+
+	spin_lock_bh(&mfc_unres_lock);
+	if (!list_empty(it->cache))
+		return list_first_entry(it->cache, struct mfc6_cache, list);
+
+ end_of_list:
+	spin_unlock_bh(&mfc_unres_lock);
+	it->cache = NULL;
+
+	return NULL;
+}
+
+static void ipmr_mfc_seq_stop(struct seq_file *seq, void *v)
+{
+	struct ipmr_mfc_iter *it = seq->private;
+	struct mr6_table *mrt = it->mrt;
+
+	if (it->cache == &mrt->mfc6_unres_queue)
+		spin_unlock_bh(&mfc_unres_lock);
+	else if (it->cache == mrt->mfc6_cache_array)
+		read_unlock(&mrt_lock);
+}
+
+static int ipmr_mfc_seq_show(struct seq_file *seq, void *v)
+{
+	int n;
+
+	if (v == SEQ_START_TOKEN) {
+		seq_puts(seq,
+			 "Group                            "
+			 "Origin                           "
+			 "Iif      Pkts  Bytes     Wrong  Oifs\n");
+	} else {
+		const struct mfc6_cache *mfc = v;
+		const struct ipmr_mfc_iter *it = seq->private;
+		struct mr6_table *mrt = it->mrt;
+
+		seq_printf(seq, "%pI6 %pI6 %-3hd",
+			   &mfc->mf6c_mcastgrp, &mfc->mf6c_origin,
+			   mfc->mf6c_parent);
+
+		if (it->cache != &mrt->mfc6_unres_queue) {
+			seq_printf(seq, " %8lu %8lu %8lu",
+				   mfc->mfc_un.res.pkt,
+				   mfc->mfc_un.res.bytes,
+				   mfc->mfc_un.res.wrong_if);
+			for (n = mfc->mfc_un.res.minvif;
+			     n < mfc->mfc_un.res.maxvif; n++) {
+				if (MIF_EXISTS(mrt, n) &&
+				    mfc->mfc_un.res.ttls[n] < 255)
+					seq_printf(seq,
+						   " %2d:%-3d",
+						   n, mfc->mfc_un.res.ttls[n]);
+			}
+		} else {
+			/* unresolved mfc_caches don't contain
+			 * pkt, bytes and wrong_if values
+			 */
+			seq_printf(seq, " %8lu %8lu %8lu", 0ul, 0ul, 0ul);
+		}
+		seq_putc(seq, '\n');
+	}
+	return 0;
+}
+
+static const struct seq_operations ipmr_mfc_seq_ops = {
+	.start = ipmr_mfc_seq_start,
+	.next  = ipmr_mfc_seq_next,
+	.stop  = ipmr_mfc_seq_stop,
+	.show  = ipmr_mfc_seq_show,
+};
+
+static int ipmr_mfc_open(struct inode *inode, struct file *file)
+{
+	return seq_open_net(inode, file, &ipmr_mfc_seq_ops,
+			    sizeof(struct ipmr_mfc_iter));
+}
+
+static const struct file_operations ip6mr_mfc_fops = {
+	.owner	 = THIS_MODULE,
+	.open    = ipmr_mfc_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release_net,
+};
+#endif
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+
+static int pim6_rcv(struct sk_buff *skb)
+{
+	struct pimreghdr *pim;
+	struct ipv6hdr   *encap;
+	struct net_device  *reg_dev = NULL;
+	struct net *net = dev_net(skb->dev);
+	struct mr6_table *mrt;
+	struct flowi6 fl6 = {
+		.flowi6_iif	= skb->dev->ifindex,
+		.flowi6_mark	= skb->mark,
+	};
+	int reg_vif_num;
+
+	if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
+		goto drop;
+
+	pim = (struct pimreghdr *)skb_transport_header(skb);
+	if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
+	    (pim->flags & PIM_NULL_REGISTER) ||
+	    (csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
+			     sizeof(*pim), IPPROTO_PIM,
+			     csum_partial((void *)pim, sizeof(*pim), 0)) &&
+	     csum_fold(skb_checksum(skb, 0, skb->len, 0))))
+		goto drop;
+
+	/* check if the inner packet is destined to mcast group */
+	encap = (struct ipv6hdr *)(skb_transport_header(skb) +
+				   sizeof(*pim));
+
+	if (!ipv6_addr_is_multicast(&encap->daddr) ||
+	    encap->payload_len == 0 ||
+	    ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
+		goto drop;
+
+	if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
+		goto drop;
+	reg_vif_num = mrt->mroute_reg_vif_num;
+
+	read_lock(&mrt_lock);
+	if (reg_vif_num >= 0)
+		reg_dev = mrt->vif6_table[reg_vif_num].dev;
+	if (reg_dev)
+		dev_hold(reg_dev);
+	read_unlock(&mrt_lock);
+
+	if (!reg_dev)
+		goto drop;
+
+	skb->mac_header = skb->network_header;
+	skb_pull(skb, (u8 *)encap - skb->data);
+	skb_reset_network_header(skb);
+	skb->protocol = htons(ETH_P_IPV6);
+	skb->ip_summed = CHECKSUM_NONE;
+
+	skb_tunnel_rx(skb, reg_dev, dev_net(reg_dev));
+
+	netif_rx(skb);
+
+	dev_put(reg_dev);
+	return 0;
+ drop:
+	kfree_skb(skb);
+	return 0;
+}
+
+static const struct inet6_protocol pim6_protocol = {
+	.handler	=	pim6_rcv,
+};
+
+/* Service routines creating virtual interfaces: PIMREG */
+
+static netdev_tx_t reg_vif_xmit(struct sk_buff *skb,
+				      struct net_device *dev)
+{
+	struct net *net = dev_net(dev);
+	struct mr6_table *mrt;
+	struct flowi6 fl6 = {
+		.flowi6_oif	= dev->ifindex,
+		.flowi6_iif	= skb->skb_iif ? : LOOPBACK_IFINDEX,
+		.flowi6_mark	= skb->mark,
+	};
+	int err;
+
+	err = ip6mr_fib_lookup(net, &fl6, &mrt);
+	if (err < 0) {
+		kfree_skb(skb);
+		return err;
+	}
+
+	read_lock(&mrt_lock);
+	dev->stats.tx_bytes += skb->len;
+	dev->stats.tx_packets++;
+	ip6mr_cache_report(mrt, skb, mrt->mroute_reg_vif_num, MRT6MSG_WHOLEPKT);
+	read_unlock(&mrt_lock);
+	kfree_skb(skb);
+	return NETDEV_TX_OK;
+}
+
+static int reg_vif_get_iflink(const struct net_device *dev)
+{
+	return 0;
+}
+
+static const struct net_device_ops reg_vif_netdev_ops = {
+	.ndo_start_xmit	= reg_vif_xmit,
+	.ndo_get_iflink = reg_vif_get_iflink,
+};
+
+static void reg_vif_setup(struct net_device *dev)
+{
+	dev->type		= ARPHRD_PIMREG;
+	dev->mtu		= 1500 - sizeof(struct ipv6hdr) - 8;
+	dev->flags		= IFF_NOARP;
+	dev->netdev_ops		= &reg_vif_netdev_ops;
+	dev->destructor		= free_netdev;
+	dev->features		|= NETIF_F_NETNS_LOCAL;
+}
+
+static struct net_device *ip6mr_reg_vif(struct net *net, struct mr6_table *mrt)
+{
+	struct net_device *dev;
+	char name[IFNAMSIZ];
+
+	if (mrt->id == RT6_TABLE_DFLT)
+		sprintf(name, "pim6reg");
+	else
+		sprintf(name, "pim6reg%u", mrt->id);
+
+	dev = alloc_netdev(0, name, NET_NAME_UNKNOWN, reg_vif_setup);
+	if (!dev)
+		return NULL;
+
+	dev_net_set(dev, net);
+
+	if (register_netdevice(dev)) {
+		free_netdev(dev);
+		return NULL;
+	}
+
+	if (dev_open(dev))
+		goto failure;
+
+	dev_hold(dev);
+	return dev;
+
+failure:
+	/* allow the register to be completed before unregistering. */
+	rtnl_unlock();
+	rtnl_lock();
+
+	unregister_netdevice(dev);
+	return NULL;
+}
+#endif
+
+/*
+ *	Delete a VIF entry
+ */
+
+static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
+{
+	struct mif_device *v;
+	struct net_device *dev;
+	struct inet6_dev *in6_dev;
+
+	if (vifi < 0 || vifi >= mrt->maxvif)
+		return -EADDRNOTAVAIL;
+
+	v = &mrt->vif6_table[vifi];
+
+	write_lock_bh(&mrt_lock);
+	dev = v->dev;
+	v->dev = NULL;
+
+	if (!dev) {
+		write_unlock_bh(&mrt_lock);
+		return -EADDRNOTAVAIL;
+	}
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+	if (vifi == mrt->mroute_reg_vif_num)
+		mrt->mroute_reg_vif_num = -1;
+#endif
+
+	if (vifi + 1 == mrt->maxvif) {
+		int tmp;
+		for (tmp = vifi - 1; tmp >= 0; tmp--) {
+			if (MIF_EXISTS(mrt, tmp))
+				break;
+		}
+		mrt->maxvif = tmp + 1;
+	}
+
+	write_unlock_bh(&mrt_lock);
+
+	dev_set_allmulti(dev, -1);
+
+	in6_dev = __in6_dev_get(dev);
+	if (in6_dev) {
+		in6_dev->cnf.mc_forwarding--;
+		inet6_netconf_notify_devconf(dev_net(dev),
+					     NETCONFA_MC_FORWARDING,
+					     dev->ifindex, &in6_dev->cnf);
+	}
+
+	if (v->flags & MIFF_REGISTER)
+		unregister_netdevice_queue(dev, head);
+
+	dev_put(dev);
+	return 0;
+}
+
+static inline void ip6mr_cache_free(struct mfc6_cache *c)
+{
+	kmem_cache_free(mrt_cachep, c);
+}
+
+/* Destroy an unresolved cache entry, killing queued skbs
+   and reporting error to netlink readers.
+ */
+
+static void ip6mr_destroy_unres(struct mr6_table *mrt, struct mfc6_cache *c)
+{
+	struct net *net = read_pnet(&mrt->net);
+	struct sk_buff *skb;
+
+	atomic_dec(&mrt->cache_resolve_queue_len);
+
+	while ((skb = skb_dequeue(&c->mfc_un.unres.unresolved)) != NULL) {
+		if (ipv6_hdr(skb)->version == 0) {
+			struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
+			nlh->nlmsg_type = NLMSG_ERROR;
+			nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
+			skb_trim(skb, nlh->nlmsg_len);
+			((struct nlmsgerr *)nlmsg_data(nlh))->error = -ETIMEDOUT;
+			rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
+		} else
+			kfree_skb(skb);
+	}
+
+	ip6mr_cache_free(c);
+}
+
+
+/* Timer process for all the unresolved queue. */
+
+static void ipmr_do_expire_process(struct mr6_table *mrt)
+{
+	unsigned long now = jiffies;
+	unsigned long expires = 10 * HZ;
+	struct mfc6_cache *c, *next;
+
+	list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
+		if (time_after(c->mfc_un.unres.expires, now)) {
+			/* not yet... */
+			unsigned long interval = c->mfc_un.unres.expires - now;
+			if (interval < expires)
+				expires = interval;
+			continue;
+		}
+
+		list_del(&c->list);
+		mr6_netlink_event(mrt, c, RTM_DELROUTE);
+		ip6mr_destroy_unres(mrt, c);
+	}
+
+	if (!list_empty(&mrt->mfc6_unres_queue))
+		mod_timer(&mrt->ipmr_expire_timer, jiffies + expires);
+}
+
+static void ipmr_expire_process(unsigned long arg)
+{
+	struct mr6_table *mrt = (struct mr6_table *)arg;
+
+	if (!spin_trylock(&mfc_unres_lock)) {
+		mod_timer(&mrt->ipmr_expire_timer, jiffies + 1);
+		return;
+	}
+
+	if (!list_empty(&mrt->mfc6_unres_queue))
+		ipmr_do_expire_process(mrt);
+
+	spin_unlock(&mfc_unres_lock);
+}
+
+/* Fill oifs list. It is called under write locked mrt_lock. */
+
+static void ip6mr_update_thresholds(struct mr6_table *mrt, struct mfc6_cache *cache,
+				    unsigned char *ttls)
+{
+	int vifi;
+
+	cache->mfc_un.res.minvif = MAXMIFS;
+	cache->mfc_un.res.maxvif = 0;
+	memset(cache->mfc_un.res.ttls, 255, MAXMIFS);
+
+	for (vifi = 0; vifi < mrt->maxvif; vifi++) {
+		if (MIF_EXISTS(mrt, vifi) &&
+		    ttls[vifi] && ttls[vifi] < 255) {
+			cache->mfc_un.res.ttls[vifi] = ttls[vifi];
+			if (cache->mfc_un.res.minvif > vifi)
+				cache->mfc_un.res.minvif = vifi;
+			if (cache->mfc_un.res.maxvif <= vifi)
+				cache->mfc_un.res.maxvif = vifi + 1;
+		}
+	}
+}
+
+static int mif6_add(struct net *net, struct mr6_table *mrt,
+		    struct mif6ctl *vifc, int mrtsock)
+{
+	int vifi = vifc->mif6c_mifi;
+	struct mif_device *v = &mrt->vif6_table[vifi];
+	struct net_device *dev;
+	struct inet6_dev *in6_dev;
+	int err;
+
+	/* Is vif busy ? */
+	if (MIF_EXISTS(mrt, vifi))
+		return -EADDRINUSE;
+
+	switch (vifc->mif6c_flags) {
+#ifdef CONFIG_IPV6_PIMSM_V2
+	case MIFF_REGISTER:
+		/*
+		 * Special Purpose VIF in PIM
+		 * All the packets will be sent to the daemon
+		 */
+		if (mrt->mroute_reg_vif_num >= 0)
+			return -EADDRINUSE;
+		dev = ip6mr_reg_vif(net, mrt);
+		if (!dev)
+			return -ENOBUFS;
+		err = dev_set_allmulti(dev, 1);
+		if (err) {
+			unregister_netdevice(dev);
+			dev_put(dev);
+			return err;
+		}
+		break;
+#endif
+	case 0:
+		dev = dev_get_by_index(net, vifc->mif6c_pifi);
+		if (!dev)
+			return -EADDRNOTAVAIL;
+		err = dev_set_allmulti(dev, 1);
+		if (err) {
+			dev_put(dev);
+			return err;
+		}
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	in6_dev = __in6_dev_get(dev);
+	if (in6_dev) {
+		in6_dev->cnf.mc_forwarding++;
+		inet6_netconf_notify_devconf(dev_net(dev),
+					     NETCONFA_MC_FORWARDING,
+					     dev->ifindex, &in6_dev->cnf);
+	}
+
+	/*
+	 *	Fill in the VIF structures
+	 */
+	v->rate_limit = vifc->vifc_rate_limit;
+	v->flags = vifc->mif6c_flags;
+	if (!mrtsock)
+		v->flags |= VIFF_STATIC;
+	v->threshold = vifc->vifc_threshold;
+	v->bytes_in = 0;
+	v->bytes_out = 0;
+	v->pkt_in = 0;
+	v->pkt_out = 0;
+	v->link = dev->ifindex;
+	if (v->flags & MIFF_REGISTER)
+		v->link = dev_get_iflink(dev);
+
+	/* And finish update writing critical data */
+	write_lock_bh(&mrt_lock);
+	v->dev = dev;
+#ifdef CONFIG_IPV6_PIMSM_V2
+	if (v->flags & MIFF_REGISTER)
+		mrt->mroute_reg_vif_num = vifi;
+#endif
+	if (vifi + 1 > mrt->maxvif)
+		mrt->maxvif = vifi + 1;
+	write_unlock_bh(&mrt_lock);
+	return 0;
+}
+
+static struct mfc6_cache *ip6mr_cache_find(struct mr6_table *mrt,
+					   const struct in6_addr *origin,
+					   const struct in6_addr *mcastgrp)
+{
+	int line = MFC6_HASH(mcastgrp, origin);
+	struct mfc6_cache *c;
+
+	list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
+		if (ipv6_addr_equal(&c->mf6c_origin, origin) &&
+		    ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp))
+			return c;
+	}
+	return NULL;
+}
+
+/* Look for a (*,*,oif) entry */
+static struct mfc6_cache *ip6mr_cache_find_any_parent(struct mr6_table *mrt,
+						      mifi_t mifi)
+{
+	int line = MFC6_HASH(&in6addr_any, &in6addr_any);
+	struct mfc6_cache *c;
+
+	list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
+		if (ipv6_addr_any(&c->mf6c_origin) &&
+		    ipv6_addr_any(&c->mf6c_mcastgrp) &&
+		    (c->mfc_un.res.ttls[mifi] < 255))
+			return c;
+
+	return NULL;
+}
+
+/* Look for a (*,G) entry */
+static struct mfc6_cache *ip6mr_cache_find_any(struct mr6_table *mrt,
+					       struct in6_addr *mcastgrp,
+					       mifi_t mifi)
+{
+	int line = MFC6_HASH(mcastgrp, &in6addr_any);
+	struct mfc6_cache *c, *proxy;
+
+	if (ipv6_addr_any(mcastgrp))
+		goto skip;
+
+	list_for_each_entry(c, &mrt->mfc6_cache_array[line], list)
+		if (ipv6_addr_any(&c->mf6c_origin) &&
+		    ipv6_addr_equal(&c->mf6c_mcastgrp, mcastgrp)) {
+			if (c->mfc_un.res.ttls[mifi] < 255)
+				return c;
+
+			/* It's ok if the mifi is part of the static tree */
+			proxy = ip6mr_cache_find_any_parent(mrt,
+							    c->mf6c_parent);
+			if (proxy && proxy->mfc_un.res.ttls[mifi] < 255)
+				return c;
+		}
+
+skip:
+	return ip6mr_cache_find_any_parent(mrt, mifi);
+}
+
+/*
+ *	Allocate a multicast cache entry
+ */
+static struct mfc6_cache *ip6mr_cache_alloc(void)
+{
+	struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_KERNEL);
+	if (!c)
+		return NULL;
+	c->mfc_un.res.minvif = MAXMIFS;
+	return c;
+}
+
+static struct mfc6_cache *ip6mr_cache_alloc_unres(void)
+{
+	struct mfc6_cache *c = kmem_cache_zalloc(mrt_cachep, GFP_ATOMIC);
+	if (!c)
+		return NULL;
+	skb_queue_head_init(&c->mfc_un.unres.unresolved);
+	c->mfc_un.unres.expires = jiffies + 10 * HZ;
+	return c;
+}
+
+/*
+ *	A cache entry has gone into a resolved state from queued
+ */
+
+static void ip6mr_cache_resolve(struct net *net, struct mr6_table *mrt,
+				struct mfc6_cache *uc, struct mfc6_cache *c)
+{
+	struct sk_buff *skb;
+
+	/*
+	 *	Play the pending entries through our router
+	 */
+
+	while ((skb = __skb_dequeue(&uc->mfc_un.unres.unresolved))) {
+		if (ipv6_hdr(skb)->version == 0) {
+			struct nlmsghdr *nlh = (struct nlmsghdr *)skb_pull(skb, sizeof(struct ipv6hdr));
+
+			if (__ip6mr_fill_mroute(mrt, skb, c, nlmsg_data(nlh)) > 0) {
+				nlh->nlmsg_len = skb_tail_pointer(skb) - (u8 *)nlh;
+			} else {
+				nlh->nlmsg_type = NLMSG_ERROR;
+				nlh->nlmsg_len = nlmsg_msg_size(sizeof(struct nlmsgerr));
+				skb_trim(skb, nlh->nlmsg_len);
+				((struct nlmsgerr *)nlmsg_data(nlh))->error = -EMSGSIZE;
+			}
+			rtnl_unicast(skb, net, NETLINK_CB(skb).portid);
+		} else
+			ip6_mr_forward(net, mrt, skb, c);
+	}
+}
+
+/*
+ *	Bounce a cache query up to pim6sd. We could use netlink for this but pim6sd
+ *	expects the following bizarre scheme.
+ *
+ *	Called under mrt_lock.
+ */
+
+static int ip6mr_cache_report(struct mr6_table *mrt, struct sk_buff *pkt,
+			      mifi_t mifi, int assert)
+{
+	struct sk_buff *skb;
+	struct mrt6msg *msg;
+	int ret;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+	if (assert == MRT6MSG_WHOLEPKT)
+		skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
+						+sizeof(*msg));
+	else
+#endif
+		skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
+
+	if (!skb)
+		return -ENOBUFS;
+
+	/* I suppose that internal messages
+	 * do not require checksums */
+
+	skb->ip_summed = CHECKSUM_UNNECESSARY;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+	if (assert == MRT6MSG_WHOLEPKT) {
+		/* Ugly, but we have no choice with this interface.
+		   Duplicate old header, fix length etc.
+		   And all this only to mangle msg->im6_msgtype and
+		   to set msg->im6_mbz to "mbz" :-)
+		 */
+		skb_push(skb, -skb_network_offset(pkt));
+
+		skb_push(skb, sizeof(*msg));
+		skb_reset_transport_header(skb);
+		msg = (struct mrt6msg *)skb_transport_header(skb);
+		msg->im6_mbz = 0;
+		msg->im6_msgtype = MRT6MSG_WHOLEPKT;
+		msg->im6_mif = mrt->mroute_reg_vif_num;
+		msg->im6_pad = 0;
+		msg->im6_src = ipv6_hdr(pkt)->saddr;
+		msg->im6_dst = ipv6_hdr(pkt)->daddr;
+
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+	} else
+#endif
+	{
+	/*
+	 *	Copy the IP header
+	 */
+
+	skb_put(skb, sizeof(struct ipv6hdr));
+	skb_reset_network_header(skb);
+	skb_copy_to_linear_data(skb, ipv6_hdr(pkt), sizeof(struct ipv6hdr));
+
+	/*
+	 *	Add our header
+	 */
+	skb_put(skb, sizeof(*msg));
+	skb_reset_transport_header(skb);
+	msg = (struct mrt6msg *)skb_transport_header(skb);
+
+	msg->im6_mbz = 0;
+	msg->im6_msgtype = assert;
+	msg->im6_mif = mifi;
+	msg->im6_pad = 0;
+	msg->im6_src = ipv6_hdr(pkt)->saddr;
+	msg->im6_dst = ipv6_hdr(pkt)->daddr;
+
+	skb_dst_set(skb, dst_clone(skb_dst(pkt)));
+	skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+
+	if (!mrt->mroute6_sk) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
+	/*
+	 *	Deliver to user space multicast routing algorithms
+	 */
+	ret = sock_queue_rcv_skb(mrt->mroute6_sk, skb);
+	if (ret < 0) {
+		net_warn_ratelimited("mroute6: pending queue full, dropping entries\n");
+		kfree_skb(skb);
+	}
+
+	return ret;
+}
+
+/*
+ *	Queue a packet for resolution. It gets locked cache entry!
+ */
+
+static int
+ip6mr_cache_unresolved(struct mr6_table *mrt, mifi_t mifi, struct sk_buff *skb)
+{
+	bool found = false;
+	int err;
+	struct mfc6_cache *c;
+
+	spin_lock_bh(&mfc_unres_lock);
+	list_for_each_entry(c, &mrt->mfc6_unres_queue, list) {
+		if (ipv6_addr_equal(&c->mf6c_mcastgrp, &ipv6_hdr(skb)->daddr) &&
+		    ipv6_addr_equal(&c->mf6c_origin, &ipv6_hdr(skb)->saddr)) {
+			found = true;
+			break;
+		}
+	}
+
+	if (!found) {
+		/*
+		 *	Create a new entry if allowable
+		 */
+
+		if (atomic_read(&mrt->cache_resolve_queue_len) >= 10 ||
+		    (c = ip6mr_cache_alloc_unres()) == NULL) {
+			spin_unlock_bh(&mfc_unres_lock);
+
+			kfree_skb(skb);
+			return -ENOBUFS;
+		}
+
+		/*
+		 *	Fill in the new cache entry
+		 */
+		c->mf6c_parent = -1;
+		c->mf6c_origin = ipv6_hdr(skb)->saddr;
+		c->mf6c_mcastgrp = ipv6_hdr(skb)->daddr;
+
+		/*
+		 *	Reflect first query at pim6sd
+		 */
+		err = ip6mr_cache_report(mrt, skb, mifi, MRT6MSG_NOCACHE);
+		if (err < 0) {
+			/* If the report failed throw the cache entry
+			   out - Brad Parker
+			 */
+			spin_unlock_bh(&mfc_unres_lock);
+
+			ip6mr_cache_free(c);
+			kfree_skb(skb);
+			return err;
+		}
+
+		atomic_inc(&mrt->cache_resolve_queue_len);
+		list_add(&c->list, &mrt->mfc6_unres_queue);
+		mr6_netlink_event(mrt, c, RTM_NEWROUTE);
+
+		ipmr_do_expire_process(mrt);
+	}
+
+	/*
+	 *	See if we can append the packet
+	 */
+	if (c->mfc_un.unres.unresolved.qlen > 3) {
+		kfree_skb(skb);
+		err = -ENOBUFS;
+	} else {
+		skb_queue_tail(&c->mfc_un.unres.unresolved, skb);
+		err = 0;
+	}
+
+	spin_unlock_bh(&mfc_unres_lock);
+	return err;
+}
+
+/*
+ *	MFC6 cache manipulation by user space
+ */
+
+static int ip6mr_mfc_delete(struct mr6_table *mrt, struct mf6cctl *mfc,
+			    int parent)
+{
+	int line;
+	struct mfc6_cache *c, *next;
+
+	line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
+
+	list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[line], list) {
+		if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
+		    ipv6_addr_equal(&c->mf6c_mcastgrp,
+				    &mfc->mf6cc_mcastgrp.sin6_addr) &&
+		    (parent == -1 || parent == c->mf6c_parent)) {
+			write_lock_bh(&mrt_lock);
+			list_del(&c->list);
+			write_unlock_bh(&mrt_lock);
+
+			mr6_netlink_event(mrt, c, RTM_DELROUTE);
+			ip6mr_cache_free(c);
+			return 0;
+		}
+	}
+	return -ENOENT;
+}
+
+static int ip6mr_device_event(struct notifier_block *this,
+			      unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct net *net = dev_net(dev);
+	struct mr6_table *mrt;
+	struct mif_device *v;
+	int ct;
+	LIST_HEAD(list);
+
+	if (event != NETDEV_UNREGISTER)
+		return NOTIFY_DONE;
+
+	ip6mr_for_each_table(mrt, net) {
+		v = &mrt->vif6_table[0];
+		for (ct = 0; ct < mrt->maxvif; ct++, v++) {
+			if (v->dev == dev)
+				mif6_delete(mrt, ct, &list);
+		}
+	}
+	unregister_netdevice_many(&list);
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block ip6_mr_notifier = {
+	.notifier_call = ip6mr_device_event
+};
+
+/*
+ *	Setup for IP multicast routing
+ */
+
+static int __net_init ip6mr_net_init(struct net *net)
+{
+	int err;
+
+	err = ip6mr_rules_init(net);
+	if (err < 0)
+		goto fail;
+
+#ifdef CONFIG_PROC_FS
+	err = -ENOMEM;
+	if (!proc_create("ip6_mr_vif", 0, net->proc_net, &ip6mr_vif_fops))
+		goto proc_vif_fail;
+	if (!proc_create("ip6_mr_cache", 0, net->proc_net, &ip6mr_mfc_fops))
+		goto proc_cache_fail;
+#endif
+
+	return 0;
+
+#ifdef CONFIG_PROC_FS
+proc_cache_fail:
+	remove_proc_entry("ip6_mr_vif", net->proc_net);
+proc_vif_fail:
+	ip6mr_rules_exit(net);
+#endif
+fail:
+	return err;
+}
+
+static void __net_exit ip6mr_net_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+	remove_proc_entry("ip6_mr_cache", net->proc_net);
+	remove_proc_entry("ip6_mr_vif", net->proc_net);
+#endif
+	ip6mr_rules_exit(net);
+}
+
+static struct pernet_operations ip6mr_net_ops = {
+	.init = ip6mr_net_init,
+	.exit = ip6mr_net_exit,
+};
+
+int __init ip6_mr_init(void)
+{
+	int err;
+
+	mrt_cachep = kmem_cache_create("ip6_mrt_cache",
+				       sizeof(struct mfc6_cache),
+				       0, SLAB_HWCACHE_ALIGN,
+				       NULL);
+	if (!mrt_cachep)
+		return -ENOMEM;
+
+	err = register_pernet_subsys(&ip6mr_net_ops);
+	if (err)
+		goto reg_pernet_fail;
+
+	err = register_netdevice_notifier(&ip6_mr_notifier);
+	if (err)
+		goto reg_notif_fail;
+#ifdef CONFIG_IPV6_PIMSM_V2
+	if (inet6_add_protocol(&pim6_protocol, IPPROTO_PIM) < 0) {
+		pr_err("%s: can't add PIM protocol\n", __func__);
+		err = -EAGAIN;
+		goto add_proto_fail;
+	}
+#endif
+	rtnl_register(RTNL_FAMILY_IP6MR, RTM_GETROUTE, NULL,
+		      ip6mr_rtm_dumproute, NULL);
+	return 0;
+#ifdef CONFIG_IPV6_PIMSM_V2
+add_proto_fail:
+	unregister_netdevice_notifier(&ip6_mr_notifier);
+#endif
+reg_notif_fail:
+	unregister_pernet_subsys(&ip6mr_net_ops);
+reg_pernet_fail:
+	kmem_cache_destroy(mrt_cachep);
+	return err;
+}
+
+void ip6_mr_cleanup(void)
+{
+	rtnl_unregister(RTNL_FAMILY_IP6MR, RTM_GETROUTE);
+#ifdef CONFIG_IPV6_PIMSM_V2
+	inet6_del_protocol(&pim6_protocol, IPPROTO_PIM);
+#endif
+	unregister_netdevice_notifier(&ip6_mr_notifier);
+	unregister_pernet_subsys(&ip6mr_net_ops);
+	kmem_cache_destroy(mrt_cachep);
+}
+
+static int ip6mr_mfc_add(struct net *net, struct mr6_table *mrt,
+			 struct mf6cctl *mfc, int mrtsock, int parent)
+{
+	bool found = false;
+	int line;
+	struct mfc6_cache *uc, *c;
+	unsigned char ttls[MAXMIFS];
+	int i;
+
+	if (mfc->mf6cc_parent >= MAXMIFS)
+		return -ENFILE;
+
+	memset(ttls, 255, MAXMIFS);
+	for (i = 0; i < MAXMIFS; i++) {
+		if (IF_ISSET(i, &mfc->mf6cc_ifset))
+			ttls[i] = 1;
+
+	}
+
+	line = MFC6_HASH(&mfc->mf6cc_mcastgrp.sin6_addr, &mfc->mf6cc_origin.sin6_addr);
+
+	list_for_each_entry(c, &mrt->mfc6_cache_array[line], list) {
+		if (ipv6_addr_equal(&c->mf6c_origin, &mfc->mf6cc_origin.sin6_addr) &&
+		    ipv6_addr_equal(&c->mf6c_mcastgrp,
+				    &mfc->mf6cc_mcastgrp.sin6_addr) &&
+		    (parent == -1 || parent == mfc->mf6cc_parent)) {
+			found = true;
+			break;
+		}
+	}
+
+	if (found) {
+		write_lock_bh(&mrt_lock);
+		c->mf6c_parent = mfc->mf6cc_parent;
+		ip6mr_update_thresholds(mrt, c, ttls);
+		if (!mrtsock)
+			c->mfc_flags |= MFC_STATIC;
+		write_unlock_bh(&mrt_lock);
+		mr6_netlink_event(mrt, c, RTM_NEWROUTE);
+		return 0;
+	}
+
+	if (!ipv6_addr_any(&mfc->mf6cc_mcastgrp.sin6_addr) &&
+	    !ipv6_addr_is_multicast(&mfc->mf6cc_mcastgrp.sin6_addr))
+		return -EINVAL;
+
+	c = ip6mr_cache_alloc();
+	if (!c)
+		return -ENOMEM;
+
+	c->mf6c_origin = mfc->mf6cc_origin.sin6_addr;
+	c->mf6c_mcastgrp = mfc->mf6cc_mcastgrp.sin6_addr;
+	c->mf6c_parent = mfc->mf6cc_parent;
+	ip6mr_update_thresholds(mrt, c, ttls);
+	if (!mrtsock)
+		c->mfc_flags |= MFC_STATIC;
+
+	write_lock_bh(&mrt_lock);
+	list_add(&c->list, &mrt->mfc6_cache_array[line]);
+	write_unlock_bh(&mrt_lock);
+
+	/*
+	 *	Check to see if we resolved a queued list. If so we
+	 *	need to send on the frames and tidy up.
+	 */
+	found = false;
+	spin_lock_bh(&mfc_unres_lock);
+	list_for_each_entry(uc, &mrt->mfc6_unres_queue, list) {
+		if (ipv6_addr_equal(&uc->mf6c_origin, &c->mf6c_origin) &&
+		    ipv6_addr_equal(&uc->mf6c_mcastgrp, &c->mf6c_mcastgrp)) {
+			list_del(&uc->list);
+			atomic_dec(&mrt->cache_resolve_queue_len);
+			found = true;
+			break;
+		}
+	}
+	if (list_empty(&mrt->mfc6_unres_queue))
+		del_timer(&mrt->ipmr_expire_timer);
+	spin_unlock_bh(&mfc_unres_lock);
+
+	if (found) {
+		ip6mr_cache_resolve(net, mrt, uc, c);
+		ip6mr_cache_free(uc);
+	}
+	mr6_netlink_event(mrt, c, RTM_NEWROUTE);
+	return 0;
+}
+
+/*
+ *	Close the multicast socket, and clear the vif tables etc
+ */
+
+static void mroute_clean_tables(struct mr6_table *mrt)
+{
+	int i;
+	LIST_HEAD(list);
+	struct mfc6_cache *c, *next;
+
+	/*
+	 *	Shut down all active vif entries
+	 */
+	for (i = 0; i < mrt->maxvif; i++) {
+		if (!(mrt->vif6_table[i].flags & VIFF_STATIC))
+			mif6_delete(mrt, i, &list);
+	}
+	unregister_netdevice_many(&list);
+
+	/*
+	 *	Wipe the cache
+	 */
+	for (i = 0; i < MFC6_LINES; i++) {
+		list_for_each_entry_safe(c, next, &mrt->mfc6_cache_array[i], list) {
+			if (c->mfc_flags & MFC_STATIC)
+				continue;
+			write_lock_bh(&mrt_lock);
+			list_del(&c->list);
+			write_unlock_bh(&mrt_lock);
+
+			mr6_netlink_event(mrt, c, RTM_DELROUTE);
+			ip6mr_cache_free(c);
+		}
+	}
+
+	if (atomic_read(&mrt->cache_resolve_queue_len) != 0) {
+		spin_lock_bh(&mfc_unres_lock);
+		list_for_each_entry_safe(c, next, &mrt->mfc6_unres_queue, list) {
+			list_del(&c->list);
+			mr6_netlink_event(mrt, c, RTM_DELROUTE);
+			ip6mr_destroy_unres(mrt, c);
+		}
+		spin_unlock_bh(&mfc_unres_lock);
+	}
+}
+
+static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
+{
+	int err = 0;
+	struct net *net = sock_net(sk);
+
+	rtnl_lock();
+	write_lock_bh(&mrt_lock);
+	if (likely(mrt->mroute6_sk == NULL)) {
+		mrt->mroute6_sk = sk;
+		net->ipv6.devconf_all->mc_forwarding++;
+		inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
+					     NETCONFA_IFINDEX_ALL,
+					     net->ipv6.devconf_all);
+	}
+	else
+		err = -EADDRINUSE;
+	write_unlock_bh(&mrt_lock);
+
+	rtnl_unlock();
+
+	return err;
+}
+
+int ip6mr_sk_done(struct sock *sk)
+{
+	int err = -EACCES;
+	struct net *net = sock_net(sk);
+	struct mr6_table *mrt;
+
+	rtnl_lock();
+	ip6mr_for_each_table(mrt, net) {
+		if (sk == mrt->mroute6_sk) {
+			write_lock_bh(&mrt_lock);
+			mrt->mroute6_sk = NULL;
+			net->ipv6.devconf_all->mc_forwarding--;
+			inet6_netconf_notify_devconf(net,
+						     NETCONFA_MC_FORWARDING,
+						     NETCONFA_IFINDEX_ALL,
+						     net->ipv6.devconf_all);
+			write_unlock_bh(&mrt_lock);
+
+			mroute_clean_tables(mrt);
+			err = 0;
+			break;
+		}
+	}
+	rtnl_unlock();
+
+	return err;
+}
+
+struct sock *mroute6_socket(struct net *net, struct sk_buff *skb)
+{
+	struct mr6_table *mrt;
+	struct flowi6 fl6 = {
+		.flowi6_iif	= skb->skb_iif ? : LOOPBACK_IFINDEX,
+		.flowi6_oif	= skb->dev->ifindex,
+		.flowi6_mark	= skb->mark,
+	};
+
+	if (ip6mr_fib_lookup(net, &fl6, &mrt) < 0)
+		return NULL;
+
+	return mrt->mroute6_sk;
+}
+
+/*
+ *	Socket options and virtual interface manipulation. The whole
+ *	virtual interface system is a complete heap, but unfortunately
+ *	that's how BSD mrouted happens to think. Maybe one day with a proper
+ *	MOSPF/PIM router set up we can clean this up.
+ */
+
+int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
+{
+	int ret, parent = 0;
+	struct mif6ctl vif;
+	struct mf6cctl mfc;
+	mifi_t mifi;
+	struct net *net = sock_net(sk);
+	struct mr6_table *mrt;
+
+	mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+	if (!mrt)
+		return -ENOENT;
+
+	if (optname != MRT6_INIT) {
+		if (sk != mrt->mroute6_sk && !ns_capable(net->user_ns, CAP_NET_ADMIN))
+			return -EACCES;
+	}
+
+	switch (optname) {
+	case MRT6_INIT:
+		if (sk->sk_type != SOCK_RAW ||
+		    inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
+			return -EOPNOTSUPP;
+		if (optlen < sizeof(int))
+			return -EINVAL;
+
+		return ip6mr_sk_init(mrt, sk);
+
+	case MRT6_DONE:
+		return ip6mr_sk_done(sk);
+
+	case MRT6_ADD_MIF:
+		if (optlen < sizeof(vif))
+			return -EINVAL;
+		if (copy_from_user(&vif, optval, sizeof(vif)))
+			return -EFAULT;
+		if (vif.mif6c_mifi >= MAXMIFS)
+			return -ENFILE;
+		rtnl_lock();
+		ret = mif6_add(net, mrt, &vif, sk == mrt->mroute6_sk);
+		rtnl_unlock();
+		return ret;
+
+	case MRT6_DEL_MIF:
+		if (optlen < sizeof(mifi_t))
+			return -EINVAL;
+		if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
+			return -EFAULT;
+		rtnl_lock();
+		ret = mif6_delete(mrt, mifi, NULL);
+		rtnl_unlock();
+		return ret;
+
+	/*
+	 *	Manipulate the forwarding caches. These live
+	 *	in a sort of kernel/user symbiosis.
+	 */
+	case MRT6_ADD_MFC:
+	case MRT6_DEL_MFC:
+		parent = -1;
+	case MRT6_ADD_MFC_PROXY:
+	case MRT6_DEL_MFC_PROXY:
+		if (optlen < sizeof(mfc))
+			return -EINVAL;
+		if (copy_from_user(&mfc, optval, sizeof(mfc)))
+			return -EFAULT;
+		if (parent == 0)
+			parent = mfc.mf6cc_parent;
+		rtnl_lock();
+		if (optname == MRT6_DEL_MFC || optname == MRT6_DEL_MFC_PROXY)
+			ret = ip6mr_mfc_delete(mrt, &mfc, parent);
+		else
+			ret = ip6mr_mfc_add(net, mrt, &mfc,
+					    sk == mrt->mroute6_sk, parent);
+		rtnl_unlock();
+		return ret;
+
+	/*
+	 *	Control PIM assert (to activate pim will activate assert)
+	 */
+	case MRT6_ASSERT:
+	{
+		int v;
+
+		if (optlen != sizeof(v))
+			return -EINVAL;
+		if (get_user(v, (int __user *)optval))
+			return -EFAULT;
+		mrt->mroute_do_assert = v;
+		return 0;
+	}
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+	case MRT6_PIM:
+	{
+		int v;
+
+		if (optlen != sizeof(v))
+			return -EINVAL;
+		if (get_user(v, (int __user *)optval))
+			return -EFAULT;
+		v = !!v;
+		rtnl_lock();
+		ret = 0;
+		if (v != mrt->mroute_do_pim) {
+			mrt->mroute_do_pim = v;
+			mrt->mroute_do_assert = v;
+		}
+		rtnl_unlock();
+		return ret;
+	}
+
+#endif
+#ifdef CONFIG_IPV6_MROUTE_MULTIPLE_TABLES
+	case MRT6_TABLE:
+	{
+		u32 v;
+
+		if (optlen != sizeof(u32))
+			return -EINVAL;
+		if (get_user(v, (u32 __user *)optval))
+			return -EFAULT;
+		/* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
+		if (v != RT_TABLE_DEFAULT && v >= 100000000)
+			return -EINVAL;
+		if (sk == mrt->mroute6_sk)
+			return -EBUSY;
+
+		rtnl_lock();
+		ret = 0;
+		if (!ip6mr_new_table(net, v))
+			ret = -ENOMEM;
+		raw6_sk(sk)->ip6mr_table = v;
+		rtnl_unlock();
+		return ret;
+	}
+#endif
+	/*
+	 *	Spurious command, or MRT6_VERSION which you cannot
+	 *	set.
+	 */
+	default:
+		return -ENOPROTOOPT;
+	}
+}
+
+/*
+ *	Getsock opt support for the multicast routing system.
+ */
+
+int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
+			  int __user *optlen)
+{
+	int olr;
+	int val;
+	struct net *net = sock_net(sk);
+	struct mr6_table *mrt;
+
+	mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+	if (!mrt)
+		return -ENOENT;
+
+	switch (optname) {
+	case MRT6_VERSION:
+		val = 0x0305;
+		break;
+#ifdef CONFIG_IPV6_PIMSM_V2
+	case MRT6_PIM:
+		val = mrt->mroute_do_pim;
+		break;
+#endif
+	case MRT6_ASSERT:
+		val = mrt->mroute_do_assert;
+		break;
+	default:
+		return -ENOPROTOOPT;
+	}
+
+	if (get_user(olr, optlen))
+		return -EFAULT;
+
+	olr = min_t(int, olr, sizeof(int));
+	if (olr < 0)
+		return -EINVAL;
+
+	if (put_user(olr, optlen))
+		return -EFAULT;
+	if (copy_to_user(optval, &val, olr))
+		return -EFAULT;
+	return 0;
+}
+
+/*
+ *	The IP multicast ioctl support routines.
+ */
+
+int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg)
+{
+	struct sioc_sg_req6 sr;
+	struct sioc_mif_req6 vr;
+	struct mif_device *vif;
+	struct mfc6_cache *c;
+	struct net *net = sock_net(sk);
+	struct mr6_table *mrt;
+
+	mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+	if (!mrt)
+		return -ENOENT;
+
+	switch (cmd) {
+	case SIOCGETMIFCNT_IN6:
+		if (copy_from_user(&vr, arg, sizeof(vr)))
+			return -EFAULT;
+		if (vr.mifi >= mrt->maxvif)
+			return -EINVAL;
+		read_lock(&mrt_lock);
+		vif = &mrt->vif6_table[vr.mifi];
+		if (MIF_EXISTS(mrt, vr.mifi)) {
+			vr.icount = vif->pkt_in;
+			vr.ocount = vif->pkt_out;
+			vr.ibytes = vif->bytes_in;
+			vr.obytes = vif->bytes_out;
+			read_unlock(&mrt_lock);
+
+			if (copy_to_user(arg, &vr, sizeof(vr)))
+				return -EFAULT;
+			return 0;
+		}
+		read_unlock(&mrt_lock);
+		return -EADDRNOTAVAIL;
+	case SIOCGETSGCNT_IN6:
+		if (copy_from_user(&sr, arg, sizeof(sr)))
+			return -EFAULT;
+
+		read_lock(&mrt_lock);
+		c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
+		if (c) {
+			sr.pktcnt = c->mfc_un.res.pkt;
+			sr.bytecnt = c->mfc_un.res.bytes;
+			sr.wrong_if = c->mfc_un.res.wrong_if;
+			read_unlock(&mrt_lock);
+
+			if (copy_to_user(arg, &sr, sizeof(sr)))
+				return -EFAULT;
+			return 0;
+		}
+		read_unlock(&mrt_lock);
+		return -EADDRNOTAVAIL;
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+#ifdef CONFIG_COMPAT
+struct compat_sioc_sg_req6 {
+	struct sockaddr_in6 src;
+	struct sockaddr_in6 grp;
+	compat_ulong_t pktcnt;
+	compat_ulong_t bytecnt;
+	compat_ulong_t wrong_if;
+};
+
+struct compat_sioc_mif_req6 {
+	mifi_t	mifi;
+	compat_ulong_t icount;
+	compat_ulong_t ocount;
+	compat_ulong_t ibytes;
+	compat_ulong_t obytes;
+};
+
+int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *arg)
+{
+	struct compat_sioc_sg_req6 sr;
+	struct compat_sioc_mif_req6 vr;
+	struct mif_device *vif;
+	struct mfc6_cache *c;
+	struct net *net = sock_net(sk);
+	struct mr6_table *mrt;
+
+	mrt = ip6mr_get_table(net, raw6_sk(sk)->ip6mr_table ? : RT6_TABLE_DFLT);
+	if (!mrt)
+		return -ENOENT;
+
+	switch (cmd) {
+	case SIOCGETMIFCNT_IN6:
+		if (copy_from_user(&vr, arg, sizeof(vr)))
+			return -EFAULT;
+		if (vr.mifi >= mrt->maxvif)
+			return -EINVAL;
+		read_lock(&mrt_lock);
+		vif = &mrt->vif6_table[vr.mifi];
+		if (MIF_EXISTS(mrt, vr.mifi)) {
+			vr.icount = vif->pkt_in;
+			vr.ocount = vif->pkt_out;
+			vr.ibytes = vif->bytes_in;
+			vr.obytes = vif->bytes_out;
+			read_unlock(&mrt_lock);
+
+			if (copy_to_user(arg, &vr, sizeof(vr)))
+				return -EFAULT;
+			return 0;
+		}
+		read_unlock(&mrt_lock);
+		return -EADDRNOTAVAIL;
+	case SIOCGETSGCNT_IN6:
+		if (copy_from_user(&sr, arg, sizeof(sr)))
+			return -EFAULT;
+
+		read_lock(&mrt_lock);
+		c = ip6mr_cache_find(mrt, &sr.src.sin6_addr, &sr.grp.sin6_addr);
+		if (c) {
+			sr.pktcnt = c->mfc_un.res.pkt;
+			sr.bytecnt = c->mfc_un.res.bytes;
+			sr.wrong_if = c->mfc_un.res.wrong_if;
+			read_unlock(&mrt_lock);
+
+			if (copy_to_user(arg, &sr, sizeof(sr)))
+				return -EFAULT;
+			return 0;
+		}
+		read_unlock(&mrt_lock);
+		return -EADDRNOTAVAIL;
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+#endif
+
+static inline int ip6mr_forward2_finish(struct sock *sk, struct sk_buff *skb)
+{
+	IP6_INC_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
+			 IPSTATS_MIB_OUTFORWDATAGRAMS);
+	IP6_ADD_STATS_BH(dev_net(skb_dst(skb)->dev), ip6_dst_idev(skb_dst(skb)),
+			 IPSTATS_MIB_OUTOCTETS, skb->len);
+	return dst_output_sk(sk, skb);
+}
+
+/*
+ *	Processing handlers for ip6mr_forward
+ */
+
+static int ip6mr_forward2(struct net *net, struct mr6_table *mrt,
+			  struct sk_buff *skb, struct mfc6_cache *c, int vifi)
+{
+	struct ipv6hdr *ipv6h;
+	struct mif_device *vif = &mrt->vif6_table[vifi];
+	struct net_device *dev;
+	struct dst_entry *dst;
+	struct flowi6 fl6;
+
+	if (!vif->dev)
+		goto out_free;
+
+#ifdef CONFIG_IPV6_PIMSM_V2
+	if (vif->flags & MIFF_REGISTER) {
+		vif->pkt_out++;
+		vif->bytes_out += skb->len;
+		vif->dev->stats.tx_bytes += skb->len;
+		vif->dev->stats.tx_packets++;
+		ip6mr_cache_report(mrt, skb, vifi, MRT6MSG_WHOLEPKT);
+		goto out_free;
+	}
+#endif
+
+	ipv6h = ipv6_hdr(skb);
+
+	fl6 = (struct flowi6) {
+		.flowi6_oif = vif->link,
+		.daddr = ipv6h->daddr,
+	};
+
+	dst = ip6_route_output(net, NULL, &fl6);
+	if (dst->error) {
+		dst_release(dst);
+		goto out_free;
+	}
+
+	skb_dst_drop(skb);
+	skb_dst_set(skb, dst);
+
+	/*
+	 * RFC1584 teaches, that DVMRP/PIM router must deliver packets locally
+	 * not only before forwarding, but after forwarding on all output
+	 * interfaces. It is clear, if mrouter runs a multicasting
+	 * program, it should receive packets not depending to what interface
+	 * program is joined.
+	 * If we will not make it, the program will have to join on all
+	 * interfaces. On the other hand, multihoming host (or router, but
+	 * not mrouter) cannot join to more than one interface - it will
+	 * result in receiving multiple packets.
+	 */
+	dev = vif->dev;
+	skb->dev = dev;
+	vif->pkt_out++;
+	vif->bytes_out += skb->len;
+
+	/* We are about to write */
+	/* XXX: extension headers? */
+	if (skb_cow(skb, sizeof(*ipv6h) + LL_RESERVED_SPACE(dev)))
+		goto out_free;
+
+	ipv6h = ipv6_hdr(skb);
+	ipv6h->hop_limit--;
+
+	IP6CB(skb)->flags |= IP6SKB_FORWARDED;
+
+	return NF_HOOK(NFPROTO_IPV6, NF_INET_FORWARD, NULL, skb,
+		       skb->dev, dev,
+		       ip6mr_forward2_finish);
+
+out_free:
+	kfree_skb(skb);
+	return 0;
+}
+
+static int ip6mr_find_vif(struct mr6_table *mrt, struct net_device *dev)
+{
+	int ct;
+
+	for (ct = mrt->maxvif - 1; ct >= 0; ct--) {
+		if (mrt->vif6_table[ct].dev == dev)
+			break;
+	}
+	return ct;
+}
+
+static void ip6_mr_forward(struct net *net, struct mr6_table *mrt,
+			   struct sk_buff *skb, struct mfc6_cache *cache)
+{
+	int psend = -1;
+	int vif, ct;
+	int true_vifi = ip6mr_find_vif(mrt, skb->dev);
+
+	vif = cache->mf6c_parent;
+	cache->mfc_un.res.pkt++;
+	cache->mfc_un.res.bytes += skb->len;
+
+	if (ipv6_addr_any(&cache->mf6c_origin) && true_vifi >= 0) {
+		struct mfc6_cache *cache_proxy;
+
+		/* For an (*,G) entry, we only check that the incoming
+		 * interface is part of the static tree.
+		 */
+		cache_proxy = ip6mr_cache_find_any_parent(mrt, vif);
+		if (cache_proxy &&
+		    cache_proxy->mfc_un.res.ttls[true_vifi] < 255)
+			goto forward;
+	}
+
+	/*
+	 * Wrong interface: drop packet and (maybe) send PIM assert.
+	 */
+	if (mrt->vif6_table[vif].dev != skb->dev) {
+		cache->mfc_un.res.wrong_if++;
+
+		if (true_vifi >= 0 && mrt->mroute_do_assert &&
+		    /* pimsm uses asserts, when switching from RPT to SPT,
+		       so that we cannot check that packet arrived on an oif.
+		       It is bad, but otherwise we would need to move pretty
+		       large chunk of pimd to kernel. Ough... --ANK
+		     */
+		    (mrt->mroute_do_pim ||
+		     cache->mfc_un.res.ttls[true_vifi] < 255) &&
+		    time_after(jiffies,
+			       cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
+			cache->mfc_un.res.last_assert = jiffies;
+			ip6mr_cache_report(mrt, skb, true_vifi, MRT6MSG_WRONGMIF);
+		}
+		goto dont_forward;
+	}
+
+forward:
+	mrt->vif6_table[vif].pkt_in++;
+	mrt->vif6_table[vif].bytes_in += skb->len;
+
+	/*
+	 *	Forward the frame
+	 */
+	if (ipv6_addr_any(&cache->mf6c_origin) &&
+	    ipv6_addr_any(&cache->mf6c_mcastgrp)) {
+		if (true_vifi >= 0 &&
+		    true_vifi != cache->mf6c_parent &&
+		    ipv6_hdr(skb)->hop_limit >
+				cache->mfc_un.res.ttls[cache->mf6c_parent]) {
+			/* It's an (*,*) entry and the packet is not coming from
+			 * the upstream: forward the packet to the upstream
+			 * only.
+			 */
+			psend = cache->mf6c_parent;
+			goto last_forward;
+		}
+		goto dont_forward;
+	}
+	for (ct = cache->mfc_un.res.maxvif - 1; ct >= cache->mfc_un.res.minvif; ct--) {
+		/* For (*,G) entry, don't forward to the incoming interface */
+		if ((!ipv6_addr_any(&cache->mf6c_origin) || ct != true_vifi) &&
+		    ipv6_hdr(skb)->hop_limit > cache->mfc_un.res.ttls[ct]) {
+			if (psend != -1) {
+				struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+				if (skb2)
+					ip6mr_forward2(net, mrt, skb2, cache, psend);
+			}
+			psend = ct;
+		}
+	}
+last_forward:
+	if (psend != -1) {
+		ip6mr_forward2(net, mrt, skb, cache, psend);
+		return;
+	}
+
+dont_forward:
+	kfree_skb(skb);
+}
+
+
+/*
+ *	Multicast packets for forwarding arrive here
+ */
+
+int ip6_mr_input(struct sk_buff *skb)
+{
+	struct mfc6_cache *cache;
+	struct net *net = dev_net(skb->dev);
+	struct mr6_table *mrt;
+	struct flowi6 fl6 = {
+		.flowi6_iif	= skb->dev->ifindex,
+		.flowi6_mark	= skb->mark,
+	};
+	int err;
+
+	err = ip6mr_fib_lookup(net, &fl6, &mrt);
+	if (err < 0) {
+		kfree_skb(skb);
+		return err;
+	}
+
+	read_lock(&mrt_lock);
+	cache = ip6mr_cache_find(mrt,
+				 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr);
+	if (!cache) {
+		int vif = ip6mr_find_vif(mrt, skb->dev);
+
+		if (vif >= 0)
+			cache = ip6mr_cache_find_any(mrt,
+						     &ipv6_hdr(skb)->daddr,
+						     vif);
+	}
+
+	/*
+	 *	No usable cache entry
+	 */
+	if (!cache) {
+		int vif;
+
+		vif = ip6mr_find_vif(mrt, skb->dev);
+		if (vif >= 0) {
+			int err = ip6mr_cache_unresolved(mrt, vif, skb);
+			read_unlock(&mrt_lock);
+
+			return err;
+		}
+		read_unlock(&mrt_lock);
+		kfree_skb(skb);
+		return -ENODEV;
+	}
+
+	ip6_mr_forward(net, mrt, skb, cache);
+
+	read_unlock(&mrt_lock);
+
+	return 0;
+}
+
+
+static int __ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
+			       struct mfc6_cache *c, struct rtmsg *rtm)
+{
+	int ct;
+	struct rtnexthop *nhp;
+	struct nlattr *mp_attr;
+	struct rta_mfc_stats mfcs;
+
+	/* If cache is unresolved, don't try to parse IIF and OIF */
+	if (c->mf6c_parent >= MAXMIFS)
+		return -ENOENT;
+
+	if (MIF_EXISTS(mrt, c->mf6c_parent) &&
+	    nla_put_u32(skb, RTA_IIF, mrt->vif6_table[c->mf6c_parent].dev->ifindex) < 0)
+		return -EMSGSIZE;
+	mp_attr = nla_nest_start(skb, RTA_MULTIPATH);
+	if (!mp_attr)
+		return -EMSGSIZE;
+
+	for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) {
+		if (MIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) {
+			nhp = nla_reserve_nohdr(skb, sizeof(*nhp));
+			if (!nhp) {
+				nla_nest_cancel(skb, mp_attr);
+				return -EMSGSIZE;
+			}
+
+			nhp->rtnh_flags = 0;
+			nhp->rtnh_hops = c->mfc_un.res.ttls[ct];
+			nhp->rtnh_ifindex = mrt->vif6_table[ct].dev->ifindex;
+			nhp->rtnh_len = sizeof(*nhp);
+		}
+	}
+
+	nla_nest_end(skb, mp_attr);
+
+	mfcs.mfcs_packets = c->mfc_un.res.pkt;
+	mfcs.mfcs_bytes = c->mfc_un.res.bytes;
+	mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if;
+	if (nla_put(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs) < 0)
+		return -EMSGSIZE;
+
+	rtm->rtm_type = RTN_MULTICAST;
+	return 1;
+}
+
+int ip6mr_get_route(struct net *net,
+		    struct sk_buff *skb, struct rtmsg *rtm, int nowait)
+{
+	int err;
+	struct mr6_table *mrt;
+	struct mfc6_cache *cache;
+	struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
+
+	mrt = ip6mr_get_table(net, RT6_TABLE_DFLT);
+	if (!mrt)
+		return -ENOENT;
+
+	read_lock(&mrt_lock);
+	cache = ip6mr_cache_find(mrt, &rt->rt6i_src.addr, &rt->rt6i_dst.addr);
+	if (!cache && skb->dev) {
+		int vif = ip6mr_find_vif(mrt, skb->dev);
+
+		if (vif >= 0)
+			cache = ip6mr_cache_find_any(mrt, &rt->rt6i_dst.addr,
+						     vif);
+	}
+
+	if (!cache) {
+		struct sk_buff *skb2;
+		struct ipv6hdr *iph;
+		struct net_device *dev;
+		int vif;
+
+		if (nowait) {
+			read_unlock(&mrt_lock);
+			return -EAGAIN;
+		}
+
+		dev = skb->dev;
+		if (!dev || (vif = ip6mr_find_vif(mrt, dev)) < 0) {
+			read_unlock(&mrt_lock);
+			return -ENODEV;
+		}
+
+		/* really correct? */
+		skb2 = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
+		if (!skb2) {
+			read_unlock(&mrt_lock);
+			return -ENOMEM;
+		}
+
+		skb_reset_transport_header(skb2);
+
+		skb_put(skb2, sizeof(struct ipv6hdr));
+		skb_reset_network_header(skb2);
+
+		iph = ipv6_hdr(skb2);
+		iph->version = 0;
+		iph->priority = 0;
+		iph->flow_lbl[0] = 0;
+		iph->flow_lbl[1] = 0;
+		iph->flow_lbl[2] = 0;
+		iph->payload_len = 0;
+		iph->nexthdr = IPPROTO_NONE;
+		iph->hop_limit = 0;
+		iph->saddr = rt->rt6i_src.addr;
+		iph->daddr = rt->rt6i_dst.addr;
+
+		err = ip6mr_cache_unresolved(mrt, vif, skb2);
+		read_unlock(&mrt_lock);
+
+		return err;
+	}
+
+	if (!nowait && (rtm->rtm_flags&RTM_F_NOTIFY))
+		cache->mfc_flags |= MFC_NOTIFY;
+
+	err = __ip6mr_fill_mroute(mrt, skb, cache, rtm);
+	read_unlock(&mrt_lock);
+	return err;
+}
+
+static int ip6mr_fill_mroute(struct mr6_table *mrt, struct sk_buff *skb,
+			     u32 portid, u32 seq, struct mfc6_cache *c, int cmd,
+			     int flags)
+{
+	struct nlmsghdr *nlh;
+	struct rtmsg *rtm;
+	int err;
+
+	nlh = nlmsg_put(skb, portid, seq, cmd, sizeof(*rtm), flags);
+	if (!nlh)
+		return -EMSGSIZE;
+
+	rtm = nlmsg_data(nlh);
+	rtm->rtm_family   = RTNL_FAMILY_IP6MR;
+	rtm->rtm_dst_len  = 128;
+	rtm->rtm_src_len  = 128;
+	rtm->rtm_tos      = 0;
+	rtm->rtm_table    = mrt->id;
+	if (nla_put_u32(skb, RTA_TABLE, mrt->id))
+		goto nla_put_failure;
+	rtm->rtm_type = RTN_MULTICAST;
+	rtm->rtm_scope    = RT_SCOPE_UNIVERSE;
+	if (c->mfc_flags & MFC_STATIC)
+		rtm->rtm_protocol = RTPROT_STATIC;
+	else
+		rtm->rtm_protocol = RTPROT_MROUTED;
+	rtm->rtm_flags    = 0;
+
+	if (nla_put_in6_addr(skb, RTA_SRC, &c->mf6c_origin) ||
+	    nla_put_in6_addr(skb, RTA_DST, &c->mf6c_mcastgrp))
+		goto nla_put_failure;
+	err = __ip6mr_fill_mroute(mrt, skb, c, rtm);
+	/* do not break the dump if cache is unresolved */
+	if (err < 0 && err != -ENOENT)
+		goto nla_put_failure;
+
+	nlmsg_end(skb, nlh);
+	return 0;
+
+nla_put_failure:
+	nlmsg_cancel(skb, nlh);
+	return -EMSGSIZE;
+}
+
+static int mr6_msgsize(bool unresolved, int maxvif)
+{
+	size_t len =
+		NLMSG_ALIGN(sizeof(struct rtmsg))
+		+ nla_total_size(4)	/* RTA_TABLE */
+		+ nla_total_size(sizeof(struct in6_addr))	/* RTA_SRC */
+		+ nla_total_size(sizeof(struct in6_addr))	/* RTA_DST */
+		;
+
+	if (!unresolved)
+		len = len
+		      + nla_total_size(4)	/* RTA_IIF */
+		      + nla_total_size(0)	/* RTA_MULTIPATH */
+		      + maxvif * NLA_ALIGN(sizeof(struct rtnexthop))
+						/* RTA_MFC_STATS */
+		      + nla_total_size(sizeof(struct rta_mfc_stats))
+		;
+
+	return len;
+}
+
+static void mr6_netlink_event(struct mr6_table *mrt, struct mfc6_cache *mfc,
+			      int cmd)
+{
+	struct net *net = read_pnet(&mrt->net);
+	struct sk_buff *skb;
+	int err = -ENOBUFS;
+
+	skb = nlmsg_new(mr6_msgsize(mfc->mf6c_parent >= MAXMIFS, mrt->maxvif),
+			GFP_ATOMIC);
+	if (!skb)
+		goto errout;
+
+	err = ip6mr_fill_mroute(mrt, skb, 0, 0, mfc, cmd, 0);
+	if (err < 0)
+		goto errout;
+
+	rtnl_notify(skb, net, 0, RTNLGRP_IPV6_MROUTE, NULL, GFP_ATOMIC);
+	return;
+
+errout:
+	kfree_skb(skb);
+	if (err < 0)
+		rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE, err);
+}
+
+static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct net *net = sock_net(skb->sk);
+	struct mr6_table *mrt;
+	struct mfc6_cache *mfc;
+	unsigned int t = 0, s_t;
+	unsigned int h = 0, s_h;
+	unsigned int e = 0, s_e;
+
+	s_t = cb->args[0];
+	s_h = cb->args[1];
+	s_e = cb->args[2];
+
+	read_lock(&mrt_lock);
+	ip6mr_for_each_table(mrt, net) {
+		if (t < s_t)
+			goto next_table;
+		if (t > s_t)
+			s_h = 0;
+		for (h = s_h; h < MFC6_LINES; h++) {
+			list_for_each_entry(mfc, &mrt->mfc6_cache_array[h], list) {
+				if (e < s_e)
+					goto next_entry;
+				if (ip6mr_fill_mroute(mrt, skb,
+						      NETLINK_CB(cb->skb).portid,
+						      cb->nlh->nlmsg_seq,
+						      mfc, RTM_NEWROUTE,
+						      NLM_F_MULTI) < 0)
+					goto done;
+next_entry:
+				e++;
+			}
+			e = s_e = 0;
+		}
+		spin_lock_bh(&mfc_unres_lock);
+		list_for_each_entry(mfc, &mrt->mfc6_unres_queue, list) {
+			if (e < s_e)
+				goto next_entry2;
+			if (ip6mr_fill_mroute(mrt, skb,
+					      NETLINK_CB(cb->skb).portid,
+					      cb->nlh->nlmsg_seq,
+					      mfc, RTM_NEWROUTE,
+					      NLM_F_MULTI) < 0) {
+				spin_unlock_bh(&mfc_unres_lock);
+				goto done;
+			}
+next_entry2:
+			e++;
+		}
+		spin_unlock_bh(&mfc_unres_lock);
+		e = s_e = 0;
+		s_h = 0;
+next_table:
+		t++;
+	}
+done:
+	read_unlock(&mrt_lock);
+
+	cb->args[2] = e;
+	cb->args[1] = h;
+	cb->args[0] = t;
+
+	return skb->len;
+}