[mirror_ubuntu-focal-kernel.git] / net / bridge / br_mdb.c

#include <linux/err.h>
#include <linux/igmp.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/rculist.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <net/ip.h>
#include <net/netlink.h>
#include <net/switchdev.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
#include <net/addrconf.h>
#endif

#include "br_private.h"

static int br_rports_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
			       struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_port *p;
	struct nlattr *nest;

	if (!br->multicast_router || hlist_empty(&br->router_list))
		return 0;

	nest = nla_nest_start(skb, MDBA_ROUTER);
	if (nest == NULL)
		return -EMSGSIZE;

	hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
		if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
			goto fail;
	}

	nla_nest_end(skb, nest);
	return 0;
fail:
	nla_nest_cancel(skb, nest);
	return -EMSGSIZE;
}

static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
{
	e->state = flags & MDB_PG_FLAGS_PERMANENT;
	e->flags = 0;
	if (flags & MDB_PG_FLAGS_OFFLOAD)
		e->flags |= MDB_FLAGS_OFFLOAD;
}

static int br_mdb_fill_info(struct sk_buff *skb, struct netlink_callback *cb,
			    struct net_device *dev)
{
	struct net_bridge *br = netdev_priv(dev);
	struct net_bridge_mdb_htable *mdb;
	struct nlattr *nest, *nest2;
	int i, err = 0;
	int idx = 0, s_idx = cb->args[1];

	if (br->multicast_disabled)
		return 0;

	mdb = rcu_dereference(br->mdb);
	if (!mdb)
		return 0;

	nest = nla_nest_start(skb, MDBA_MDB);
	if (nest == NULL)
		return -EMSGSIZE;

	for (i = 0; i < mdb->max; i++) {
		struct net_bridge_mdb_entry *mp;
		struct net_bridge_port_group *p;
		struct net_bridge_port_group __rcu **pp;
		struct net_bridge_port *port;

		hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
			if (idx < s_idx)
				goto skip;

			nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
			if (nest2 == NULL) {
				err = -EMSGSIZE;
				goto out;
			}

			for (pp = &mp->ports;
			     (p = rcu_dereference(*pp)) != NULL;
			      pp = &p->next) {
				port = p->port;
				if (port) {
					struct br_mdb_entry e;
					memset(&e, 0, sizeof(e));
					e.ifindex = port->dev->ifindex;
					e.vid = p->addr.vid;
					__mdb_entry_fill_flags(&e, p->flags);
					if (p->addr.proto == htons(ETH_P_IP))
						e.addr.u.ip4 = p->addr.u.ip4;
#if IS_ENABLED(CONFIG_IPV6)
					if (p->addr.proto == htons(ETH_P_IPV6))
						e.addr.u.ip6 = p->addr.u.ip6;
#endif
					e.addr.proto = p->addr.proto;
					if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
						nla_nest_cancel(skb, nest2);
						err = -EMSGSIZE;
						goto out;
					}
				}
			}
			nla_nest_end(skb, nest2);
		skip:
			idx++;
		}
	}

out:
	cb->args[1] = idx;
	nla_nest_end(skb, nest);
	return err;
}

static int br_mdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
	struct net_device *dev;
	struct net *net = sock_net(skb->sk);
	struct nlmsghdr *nlh = NULL;
	int idx = 0, s_idx;

	s_idx = cb->args[0];

	rcu_read_lock();

	/* In theory this could be wrapped to 0... */
	cb->seq = net->dev_base_seq + br_mdb_rehash_seq;

	for_each_netdev_rcu(net, dev) {
		if (dev->priv_flags & IFF_EBRIDGE) {
			struct br_port_msg *bpm;

			if (idx < s_idx)
				goto skip;

			nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
					cb->nlh->nlmsg_seq, RTM_GETMDB,
					sizeof(*bpm), NLM_F_MULTI);
			if (nlh == NULL)
				break;

			bpm = nlmsg_data(nlh);
			memset(bpm, 0, sizeof(*bpm));
			bpm->ifindex = dev->ifindex;
			if (br_mdb_fill_info(skb, cb, dev) < 0)
				goto out;
			if (br_rports_fill_info(skb, cb, dev) < 0)
				goto out;

			cb->args[1] = 0;
			nlmsg_end(skb, nlh);
		skip:
			idx++;
		}
	}

out:
	if (nlh)
		nlmsg_end(skb, nlh);
	rcu_read_unlock();
	cb->args[0] = idx;
	return skb->len;
}

static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
				   struct net_device *dev,
				   struct br_mdb_entry *entry, u32 pid,
				   u32 seq, int type, unsigned int flags)
{
	struct nlmsghdr *nlh;
	struct br_port_msg *bpm;
	struct nlattr *nest, *nest2;

	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
	if (!nlh)
		return -EMSGSIZE;

	bpm = nlmsg_data(nlh);
	memset(bpm, 0, sizeof(*bpm));
	bpm->family  = AF_BRIDGE;
	bpm->ifindex = dev->ifindex;
	nest = nla_nest_start(skb, MDBA_MDB);
	if (nest == NULL)
		goto cancel;
	nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
	if (nest2 == NULL)
		goto end;

	if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
		goto end;

	nla_nest_end(skb, nest2);
	nla_nest_end(skb, nest);
	nlmsg_end(skb, nlh);
	return 0;

end:
	nla_nest_end(skb, nest);
cancel:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static inline size_t rtnl_mdb_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct br_port_msg))
		+ nla_total_size(sizeof(struct br_mdb_entry));
}

static void __br_mdb_notify(struct net_device *dev, struct br_mdb_entry *entry,
			    int type, struct net_bridge_port_group *pg)
{
	struct switchdev_obj_port_mdb mdb = {
		.obj = {
			.id = SWITCHDEV_OBJ_ID_PORT_MDB,
			.flags = SWITCHDEV_F_DEFER,
		},
		.vid = entry->vid,
	};
	struct net_device *port_dev;
	struct net *net = dev_net(dev);
	struct sk_buff *skb;
	int err = -ENOBUFS;

	port_dev = __dev_get_by_index(net, entry->ifindex);
	if (entry->addr.proto == htons(ETH_P_IP))
		ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
#if IS_ENABLED(CONFIG_IPV6)
	else
		ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
#endif

	mdb.obj.orig_dev = port_dev;
	if (port_dev && type == RTM_NEWMDB) {
		err = switchdev_port_obj_add(port_dev, &mdb.obj);
		if (!err && pg)
			pg->flags |= MDB_PG_FLAGS_OFFLOAD;
	} else if (port_dev && type == RTM_DELMDB) {
		switchdev_port_obj_del(port_dev, &mdb.obj);
	}

	skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
	if (!skb)
		goto errout;

	err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
	if (err < 0) {
		kfree_skb(skb);
		goto errout;
	}

	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	return;
errout:
	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
}

void br_mdb_notify(struct net_device *dev, struct net_bridge_port_group *pg,
		   int type)
{
	struct br_mdb_entry entry;

	memset(&entry, 0, sizeof(entry));
	entry.ifindex = pg->port->dev->ifindex;
	entry.addr.proto = pg->addr.proto;
	entry.addr.u.ip4 = pg->addr.u.ip4;
#if IS_ENABLED(CONFIG_IPV6)
	entry.addr.u.ip6 = pg->addr.u.ip6;
#endif
	entry.vid = pg->addr.vid;
	__mdb_entry_fill_flags(&entry, pg->flags);
	__br_mdb_notify(dev, &entry, type, pg);
}

static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
				   struct net_device *dev,
				   int ifindex, u32 pid,
				   u32 seq, int type, unsigned int flags)
{
	struct br_port_msg *bpm;
	struct nlmsghdr *nlh;
	struct nlattr *nest;

	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
	if (!nlh)
		return -EMSGSIZE;

	bpm = nlmsg_data(nlh);
	memset(bpm, 0, sizeof(*bpm));
	bpm->family = AF_BRIDGE;
	bpm->ifindex = dev->ifindex;
	nest = nla_nest_start(skb, MDBA_ROUTER);
	if (!nest)
		goto cancel;

	if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
		goto end;

	nla_nest_end(skb, nest);
	nlmsg_end(skb, nlh);
	return 0;

end:
	nla_nest_end(skb, nest);
cancel:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

static inline size_t rtnl_rtr_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct br_port_msg))
		+ nla_total_size(sizeof(__u32));
}

void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
		   int type)
{
	struct net *net = dev_net(dev);
	struct sk_buff *skb;
	int err = -ENOBUFS;
	int ifindex;

	ifindex = port ? port->dev->ifindex : 0;
	skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
	if (!skb)
		goto errout;

	err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
	if (err < 0) {
		kfree_skb(skb);
		goto errout;
	}

	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	return;

errout:
	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
}

static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
{
	if (entry->ifindex == 0)
		return false;

	if (entry->addr.proto == htons(ETH_P_IP)) {
		if (!ipv4_is_multicast(entry->addr.u.ip4))
			return false;
		if (ipv4_is_local_multicast(entry->addr.u.ip4))
			return false;
#if IS_ENABLED(CONFIG_IPV6)
	} else if (entry->addr.proto == htons(ETH_P_IPV6)) {
		if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
			return false;
#endif
	} else
		return false;
	if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
		return false;
	if (entry->vid >= VLAN_VID_MASK)
		return false;

	return true;
}

static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh,
			struct net_device **pdev, struct br_mdb_entry **pentry)
{
	struct net *net = sock_net(skb->sk);
	struct br_mdb_entry *entry;
	struct br_port_msg *bpm;
	struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
	struct net_device *dev;
	int err;

	err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
	if (err < 0)
		return err;

	bpm = nlmsg_data(nlh);
	if (bpm->ifindex == 0) {
		pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
		return -EINVAL;
	}

	dev = __dev_get_by_index(net, bpm->ifindex);
	if (dev == NULL) {
		pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
		return -ENODEV;
	}

	if (!(dev->priv_flags & IFF_EBRIDGE)) {
		pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
		return -EOPNOTSUPP;
	}

	*pdev = dev;

	if (!tb[MDBA_SET_ENTRY] ||
	    nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
		pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
		return -EINVAL;
	}

	entry = nla_data(tb[MDBA_SET_ENTRY]);
	if (!is_valid_mdb_entry(entry)) {
		pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
		return -EINVAL;
	}

	*pentry = entry;
	return 0;
}

static int br_mdb_add_group(struct net_bridge *br, struct net_bridge_port *port,
			    struct br_ip *group, unsigned char state,
			    struct net_bridge_port_group **pg)
{
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
	struct net_bridge_port_group __rcu **pp;
	struct net_bridge_mdb_htable *mdb;
	unsigned long now = jiffies;
	int err;

	mdb = mlock_dereference(br->mdb, br);
	mp = br_mdb_ip_get(mdb, group);
	if (!mp) {
		mp = br_multicast_new_group(br, port, group);
		err = PTR_ERR(mp);
		if (IS_ERR(mp))
			return err;
	}

	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
		if (p->port == port)
			return -EEXIST;
		if ((unsigned long)p->port < (unsigned long)port)
			break;
	}

	p = br_multicast_new_port_group(port, group, *pp, state);
	if (unlikely(!p))
		return -ENOMEM;
	rcu_assign_pointer(*pp, p);
	*pg = p;
	if (state == MDB_TEMPORARY)
		mod_timer(&p->timer, now + br->multicast_membership_interval);

	return 0;
}

static int __br_mdb_add(struct net *net, struct net_bridge *br,
			struct br_mdb_entry *entry,
			struct net_bridge_port_group **pg)
{
	struct br_ip ip;
	struct net_device *dev;
	struct net_bridge_port *p;
	int ret;

	if (!netif_running(br->dev) || br->multicast_disabled)
		return -EINVAL;

	dev = __dev_get_by_index(net, entry->ifindex);
	if (!dev)
		return -ENODEV;

	p = br_port_get_rtnl(dev);
	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
		return -EINVAL;

	memset(&ip, 0, sizeof(ip));
	ip.vid = entry->vid;
	ip.proto = entry->addr.proto;
	if (ip.proto == htons(ETH_P_IP))
		ip.u.ip4 = entry->addr.u.ip4;
#if IS_ENABLED(CONFIG_IPV6)
	else
		ip.u.ip6 = entry->addr.u.ip6;
#endif

	spin_lock_bh(&br->multicast_lock);
	ret = br_mdb_add_group(br, p, &ip, entry->state, pg);
	spin_unlock_bh(&br->multicast_lock);
	return ret;
}

static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	struct net *net = sock_net(skb->sk);
	struct net_bridge_port_group *pg;
	struct net_bridge_vlan_group *vg;
	struct net_device *dev, *pdev;
	struct br_mdb_entry *entry;
	struct net_bridge_port *p;
	struct net_bridge_vlan *v;
	struct net_bridge *br;
	int err;

	err = br_mdb_parse(skb, nlh, &dev, &entry);
	if (err < 0)
		return err;

	br = netdev_priv(dev);

	/* If vlan filtering is enabled and VLAN is not specified
	 * install mdb entry on all vlans configured on the port.
	 */
	pdev = __dev_get_by_index(net, entry->ifindex);
	if (!pdev)
		return -ENODEV;

	p = br_port_get_rtnl(pdev);
	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
		return -EINVAL;

	vg = nbp_vlan_group(p);
	if (br_vlan_enabled(br) && vg && entry->vid == 0) {
		list_for_each_entry(v, &vg->vlan_list, vlist) {
			entry->vid = v->vid;
			err = __br_mdb_add(net, br, entry, &pg);
			if (err)
				break;
			__br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
		}
	} else {
		err = __br_mdb_add(net, br, entry, &pg);
		if (!err)
			__br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
	}

	return err;
}

static int __br_mdb_del(struct net_bridge *br, struct br_mdb_entry *entry)
{
	struct net_bridge_mdb_htable *mdb;
	struct net_bridge_mdb_entry *mp;
	struct net_bridge_port_group *p;
	struct net_bridge_port_group __rcu **pp;
	struct br_ip ip;
	int err = -EINVAL;

	if (!netif_running(br->dev) || br->multicast_disabled)
		return -EINVAL;

	memset(&ip, 0, sizeof(ip));
	ip.vid = entry->vid;
	ip.proto = entry->addr.proto;
	if (ip.proto == htons(ETH_P_IP))
		ip.u.ip4 = entry->addr.u.ip4;
#if IS_ENABLED(CONFIG_IPV6)
	else
		ip.u.ip6 = entry->addr.u.ip6;
#endif

	spin_lock_bh(&br->multicast_lock);
	mdb = mlock_dereference(br->mdb, br);

	mp = br_mdb_ip_get(mdb, &ip);
	if (!mp)
		goto unlock;

	for (pp = &mp->ports;
	     (p = mlock_dereference(*pp, br)) != NULL;
	     pp = &p->next) {
		if (!p->port || p->port->dev->ifindex != entry->ifindex)
			continue;

		if (p->port->state == BR_STATE_DISABLED)
			goto unlock;

		__mdb_entry_fill_flags(entry, p->flags);
		rcu_assign_pointer(*pp, p->next);
		hlist_del_init(&p->mglist);
		del_timer(&p->timer);
		call_rcu_bh(&p->rcu, br_multicast_free_pg);
		err = 0;

		if (!mp->ports && !mp->mglist &&
		    netif_running(br->dev))
			mod_timer(&mp->timer, jiffies);
		break;
	}

unlock:
	spin_unlock_bh(&br->multicast_lock);
	return err;
}

static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh)
{
	struct net *net = sock_net(skb->sk);
	struct net_bridge_vlan_group *vg;
	struct net_device *dev, *pdev;
	struct br_mdb_entry *entry;
	struct net_bridge_port *p;
	struct net_bridge_vlan *v;
	struct net_bridge *br;
	int err;

	err = br_mdb_parse(skb, nlh, &dev, &entry);
	if (err < 0)
		return err;

	br = netdev_priv(dev);

	/* If vlan filtering is enabled and VLAN is not specified
	 * delete mdb entry on all vlans configured on the port.
	 */
	pdev = __dev_get_by_index(net, entry->ifindex);
	if (!pdev)
		return -ENODEV;

	p = br_port_get_rtnl(pdev);
	if (!p || p->br != br || p->state == BR_STATE_DISABLED)
		return -EINVAL;

	vg = nbp_vlan_group(p);
	if (br_vlan_enabled(br) && vg && entry->vid == 0) {
		list_for_each_entry(v, &vg->vlan_list, vlist) {
			entry->vid = v->vid;
			err = __br_mdb_del(br, entry);
			if (!err)
				__br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
		}
	} else {
		err = __br_mdb_del(br, entry);
		if (!err)
			__br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
	}

	return err;
}

void br_mdb_init(void)
{
	rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
	rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
	rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
}

void br_mdb_uninit(void)
{
	rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
	rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
	rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
}
Commit	Line	Data
ee07c6e7 CW	1	#include <linux/err.h>
	2	#include <linux/igmp.h>
	3	#include <linux/kernel.h>
	4	#include <linux/netdevice.h>
	5	#include <linux/rculist.h>
	6	#include <linux/skbuff.h>
cfd56754	7	#include <linux/if_ether.h>
ee07c6e7 CW	8	#include <net/ip.h>
ee07c6e7 CW	9	#include <net/netlink.h>
f1fecb1d	10	#include <net/switchdev.h>
ee07c6e7 CW	11	#if IS_ENABLED(CONFIG_IPV6)
ee07c6e7 CW	12	#include <net/ipv6.h>
3c3769e6	13	#include <net/addrconf.h>
ee07c6e7 CW	14	#endif
	15
	16	#include "br_private.h"
	17
	18	static int br_rports_fill_info(struct sk_buff skb, struct netlink_callback cb,
	19	struct net_device *dev)
	20	{
	21	struct net_bridge *br = netdev_priv(dev);
	22	struct net_bridge_port *p;
ee07c6e7 CW	23	struct nlattr *nest;
	24
	25	if (!br->multicast_router \|\| hlist_empty(&br->router_list))
	26	return 0;
	27
	28	nest = nla_nest_start(skb, MDBA_ROUTER);
	29	if (nest == NULL)
	30	return -EMSGSIZE;
	31
b67bfe0d	32	hlist_for_each_entry_rcu(p, &br->router_list, rlist) {
ee07c6e7 CW	33	if (p && nla_put_u32(skb, MDBA_ROUTER_PORT, p->dev->ifindex))
	34	goto fail;
	35	}
	36
	37	nla_nest_end(skb, nest);
	38	return 0;
	39	fail:
	40	nla_nest_cancel(skb, nest);
	41	return -EMSGSIZE;
	42	}
	43
9d06b6d8 ER	44	static void __mdb_entry_fill_flags(struct br_mdb_entry *e, unsigned char flags)
	45	{
	46	e->state = flags & MDB_PG_FLAGS_PERMANENT;
	47	e->flags = 0;
	48	if (flags & MDB_PG_FLAGS_OFFLOAD)
	49	e->flags \|= MDB_FLAGS_OFFLOAD;
	50	}
	51
ee07c6e7 CW	52	static int br_mdb_fill_info(struct sk_buff skb, struct netlink_callback cb,
	53	struct net_device *dev)
	54	{
	55	struct net_bridge *br = netdev_priv(dev);
	56	struct net_bridge_mdb_htable *mdb;
	57	struct nlattr nest, nest2;
	58	int i, err = 0;
	59	int idx = 0, s_idx = cb->args[1];
	60
	61	if (br->multicast_disabled)
	62	return 0;
	63
	64	mdb = rcu_dereference(br->mdb);
	65	if (!mdb)
	66	return 0;
	67
	68	nest = nla_nest_start(skb, MDBA_MDB);
	69	if (nest == NULL)
	70	return -EMSGSIZE;
	71
	72	for (i = 0; i < mdb->max; i++) {
ee07c6e7	73	struct net_bridge_mdb_entry *mp;
762a3d89	74	struct net_bridge_port_group *p;
762a3d89	75	struct net_bridge_port_group __rcu **pp;
ee07c6e7 CW	76	struct net_bridge_port *port;
ee07c6e7 CW	77
b67bfe0d	78	hlist_for_each_entry_rcu(mp, &mdb->mhash[i], hlist[mdb->ver]) {
ee07c6e7 CW	79	if (idx < s_idx)
	80	goto skip;
	81
	82	nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
	83	if (nest2 == NULL) {
	84	err = -EMSGSIZE;
	85	goto out;
	86	}
	87
	88	for (pp = &mp->ports;
	89	(p = rcu_dereference(*pp)) != NULL;
	90	pp = &p->next) {
	91	port = p->port;
	92	if (port) {
	93	struct br_mdb_entry e;
c085c499	94	memset(&e, 0, sizeof(e));
ee07c6e7	95	e.ifindex = port->dev->ifindex;
74fe61f1	96	e.vid = p->addr.vid;
9d06b6d8	97	__mdb_entry_fill_flags(&e, p->flags);
09d7cf7d VY	98	if (p->addr.proto == htons(ETH_P_IP))
09d7cf7d VY	99	e.addr.u.ip4 = p->addr.u.ip4;
ee07c6e7	100	#if IS_ENABLED(CONFIG_IPV6)
09d7cf7d VY	101	if (p->addr.proto == htons(ETH_P_IPV6))
09d7cf7d VY	102	e.addr.u.ip6 = p->addr.u.ip6;
ee07c6e7 CW	103	#endif
	104	e.addr.proto = p->addr.proto;
	105	if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(e), &e)) {
	106	nla_nest_cancel(skb, nest2);
	107	err = -EMSGSIZE;
	108	goto out;
	109	}
	110	}
	111	}
	112	nla_nest_end(skb, nest2);
	113	skip:
	114	idx++;
	115	}
	116	}
	117
	118	out:
	119	cb->args[1] = idx;
	120	nla_nest_end(skb, nest);
	121	return err;
	122	}
	123
	124	static int br_mdb_dump(struct sk_buff skb, struct netlink_callback cb)
	125	{
	126	struct net_device *dev;
	127	struct net *net = sock_net(skb->sk);
	128	struct nlmsghdr *nlh = NULL;
	129	int idx = 0, s_idx;
	130
	131	s_idx = cb->args[0];
	132
	133	rcu_read_lock();
	134
2ce297fc CW	135	/* In theory this could be wrapped to 0... */
2ce297fc CW	136	cb->seq = net->dev_base_seq + br_mdb_rehash_seq;
ee07c6e7 CW	137
	138	for_each_netdev_rcu(net, dev) {
	139	if (dev->priv_flags & IFF_EBRIDGE) {
	140	struct br_port_msg *bpm;
	141
	142	if (idx < s_idx)
	143	goto skip;
	144
	145	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
	146	cb->nlh->nlmsg_seq, RTM_GETMDB,
	147	sizeof(*bpm), NLM_F_MULTI);
	148	if (nlh == NULL)
	149	break;
	150
	151	bpm = nlmsg_data(nlh);
c085c499	152	memset(bpm, 0, sizeof(*bpm));
ee07c6e7 CW	153	bpm->ifindex = dev->ifindex;
	154	if (br_mdb_fill_info(skb, cb, dev) < 0)
	155	goto out;
	156	if (br_rports_fill_info(skb, cb, dev) < 0)
	157	goto out;
	158
	159	cb->args[1] = 0;
	160	nlmsg_end(skb, nlh);
	161	skip:
	162	idx++;
	163	}
	164	}
	165
	166	out:
	167	if (nlh)
	168	nlmsg_end(skb, nlh);
	169	rcu_read_unlock();
	170	cb->args[0] = idx;
	171	return skb->len;
	172	}
	173
37a393bc CW	174	static int nlmsg_populate_mdb_fill(struct sk_buff *skb,
	175	struct net_device *dev,
	176	struct br_mdb_entry *entry, u32 pid,
	177	u32 seq, int type, unsigned int flags)
	178	{
	179	struct nlmsghdr *nlh;
	180	struct br_port_msg *bpm;
	181	struct nlattr nest, nest2;
	182
82199679	183	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), 0);
37a393bc CW	184	if (!nlh)
	185	return -EMSGSIZE;
	186
	187	bpm = nlmsg_data(nlh);
c085c499	188	memset(bpm, 0, sizeof(*bpm));
37a393bc CW	189	bpm->family = AF_BRIDGE;
	190	bpm->ifindex = dev->ifindex;
	191	nest = nla_nest_start(skb, MDBA_MDB);
	192	if (nest == NULL)
	193	goto cancel;
	194	nest2 = nla_nest_start(skb, MDBA_MDB_ENTRY);
	195	if (nest2 == NULL)
	196	goto end;
	197
	198	if (nla_put(skb, MDBA_MDB_ENTRY_INFO, sizeof(*entry), entry))
	199	goto end;
	200
	201	nla_nest_end(skb, nest2);
	202	nla_nest_end(skb, nest);
053c095a JB	203	nlmsg_end(skb, nlh);
053c095a JB	204	return 0;
37a393bc CW	205
	206	end:
	207	nla_nest_end(skb, nest);
	208	cancel:
	209	nlmsg_cancel(skb, nlh);
	210	return -EMSGSIZE;
	211	}
	212
	213	static inline size_t rtnl_mdb_nlmsg_size(void)
	214	{
	215	return NLMSG_ALIGN(sizeof(struct br_port_msg))
	216	+ nla_total_size(sizeof(struct br_mdb_entry));
	217	}
	218
	219	static void __br_mdb_notify(struct net_device dev, struct br_mdb_entry entry,
9e8430f8	220	int type, struct net_bridge_port_group *pg)
37a393bc	221	{
f1fecb1d ER	222	struct switchdev_obj_port_mdb mdb = {
	223	.obj = {
	224	.id = SWITCHDEV_OBJ_ID_PORT_MDB,
	225	.flags = SWITCHDEV_F_DEFER,
	226	},
	227	.vid = entry->vid,
	228	};
	229	struct net_device *port_dev;
37a393bc CW	230	struct net *net = dev_net(dev);
	231	struct sk_buff *skb;
	232	int err = -ENOBUFS;
	233
f1fecb1d ER	234	port_dev = __dev_get_by_index(net, entry->ifindex);
	235	if (entry->addr.proto == htons(ETH_P_IP))
	236	ip_eth_mc_map(entry->addr.u.ip4, mdb.addr);
	237	#if IS_ENABLED(CONFIG_IPV6)
	238	else
	239	ipv6_eth_mc_map(&entry->addr.u.ip6, mdb.addr);
	240	#endif
	241
	242	mdb.obj.orig_dev = port_dev;
9e8430f8 ER	243	if (port_dev && type == RTM_NEWMDB) {
	244	err = switchdev_port_obj_add(port_dev, &mdb.obj);
	245	if (!err && pg)
	246	pg->flags \|= MDB_PG_FLAGS_OFFLOAD;
	247	} else if (port_dev && type == RTM_DELMDB) {
f1fecb1d	248	switchdev_port_obj_del(port_dev, &mdb.obj);
9e8430f8	249	}
f1fecb1d	250
37a393bc CW	251	skb = nlmsg_new(rtnl_mdb_nlmsg_size(), GFP_ATOMIC);
	252	if (!skb)
	253	goto errout;
	254
	255	err = nlmsg_populate_mdb_fill(skb, dev, entry, 0, 0, type, NTF_SELF);
	256	if (err < 0) {
	257	kfree_skb(skb);
	258	goto errout;
	259	}
	260
	261	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	262	return;
	263	errout:
	264	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
	265	}
	266
9e8430f8 ER	267	void br_mdb_notify(struct net_device dev, struct net_bridge_port_group pg,
9e8430f8 ER	268	int type)
37a393bc CW	269	{
	270	struct br_mdb_entry entry;
	271
c085c499	272	memset(&entry, 0, sizeof(entry));
9e8430f8 ER	273	entry.ifindex = pg->port->dev->ifindex;
	274	entry.addr.proto = pg->addr.proto;
	275	entry.addr.u.ip4 = pg->addr.u.ip4;
37a393bc	276	#if IS_ENABLED(CONFIG_IPV6)
9e8430f8	277	entry.addr.u.ip6 = pg->addr.u.ip6;
37a393bc	278	#endif
9e8430f8 ER	279	entry.vid = pg->addr.vid;
	280	__mdb_entry_fill_flags(&entry, pg->flags);
	281	__br_mdb_notify(dev, &entry, type, pg);
37a393bc CW	282	}
37a393bc CW	283
949f1e39 SA	284	static int nlmsg_populate_rtr_fill(struct sk_buff *skb,
	285	struct net_device *dev,
	286	int ifindex, u32 pid,
	287	u32 seq, int type, unsigned int flags)
	288	{
	289	struct br_port_msg *bpm;
	290	struct nlmsghdr *nlh;
	291	struct nlattr *nest;
	292
	293	nlh = nlmsg_put(skb, pid, seq, type, sizeof(*bpm), NLM_F_MULTI);
	294	if (!nlh)
	295	return -EMSGSIZE;
	296
	297	bpm = nlmsg_data(nlh);
	298	memset(bpm, 0, sizeof(*bpm));
	299	bpm->family = AF_BRIDGE;
	300	bpm->ifindex = dev->ifindex;
	301	nest = nla_nest_start(skb, MDBA_ROUTER);
	302	if (!nest)
	303	goto cancel;
	304
	305	if (nla_put_u32(skb, MDBA_ROUTER_PORT, ifindex))
	306	goto end;
	307
	308	nla_nest_end(skb, nest);
	309	nlmsg_end(skb, nlh);
	310	return 0;
	311
	312	end:
	313	nla_nest_end(skb, nest);
	314	cancel:
	315	nlmsg_cancel(skb, nlh);
	316	return -EMSGSIZE;
	317	}
	318
	319	static inline size_t rtnl_rtr_nlmsg_size(void)
	320	{
	321	return NLMSG_ALIGN(sizeof(struct br_port_msg))
	322	+ nla_total_size(sizeof(__u32));
	323	}
	324
	325	void br_rtr_notify(struct net_device dev, struct net_bridge_port port,
	326	int type)
	327	{
	328	struct net *net = dev_net(dev);
	329	struct sk_buff *skb;
	330	int err = -ENOBUFS;
	331	int ifindex;
	332
	333	ifindex = port ? port->dev->ifindex : 0;
	334	skb = nlmsg_new(rtnl_rtr_nlmsg_size(), GFP_ATOMIC);
	335	if (!skb)
	336	goto errout;
	337
	338	err = nlmsg_populate_rtr_fill(skb, dev, ifindex, 0, 0, type, NTF_SELF);
	339	if (err < 0) {
	340	kfree_skb(skb);
	341	goto errout;
	342	}
	343
	344	rtnl_notify(skb, net, 0, RTNLGRP_MDB, NULL, GFP_ATOMIC);
	345	return;
	346
	347	errout:
348	rtnl_set_sk_err(net, RTNLGRP_MDB, err);
349	}
350
cfd56754 CW	351	static bool is_valid_mdb_entry(struct br_mdb_entry *entry)
	352	{
	353	if (entry->ifindex == 0)
	354	return false;
	355
	356	if (entry->addr.proto == htons(ETH_P_IP)) {
	357	if (!ipv4_is_multicast(entry->addr.u.ip4))
	358	return false;
	359	if (ipv4_is_local_multicast(entry->addr.u.ip4))
	360	return false;
	361	#if IS_ENABLED(CONFIG_IPV6)
	362	} else if (entry->addr.proto == htons(ETH_P_IPV6)) {
3c3769e6	363	if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6))
cfd56754 CW	364	return false;
	365	#endif
	366	} else
	367	return false;
ccb1c31a AW	368	if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY)
ccb1c31a AW	369	return false;
74fe61f1 NA	370	if (entry->vid >= VLAN_VID_MASK)
74fe61f1 NA	371	return false;
cfd56754 CW	372
	373	return true;
	374	}
	375
	376	static int br_mdb_parse(struct sk_buff skb, struct nlmsghdr nlh,
	377	struct net_device pdev, struct br_mdb_entry pentry)
	378	{
	379	struct net *net = sock_net(skb->sk);
	380	struct br_mdb_entry *entry;
	381	struct br_port_msg *bpm;
	382	struct nlattr *tb[MDBA_SET_ENTRY_MAX+1];
	383	struct net_device *dev;
	384	int err;
	385
12d87251	386	err = nlmsg_parse(nlh, sizeof(*bpm), tb, MDBA_SET_ENTRY_MAX, NULL);
cfd56754 CW	387	if (err < 0)
	388	return err;
	389
	390	bpm = nlmsg_data(nlh);
	391	if (bpm->ifindex == 0) {
	392	pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n");
	393	return -EINVAL;
	394	}
	395
	396	dev = __dev_get_by_index(net, bpm->ifindex);
	397	if (dev == NULL) {
	398	pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n");
	399	return -ENODEV;
	400	}
	401
	402	if (!(dev->priv_flags & IFF_EBRIDGE)) {
	403	pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n");
	404	return -EOPNOTSUPP;
	405	}
	406
	407	*pdev = dev;
	408
	409	if (!tb[MDBA_SET_ENTRY] \|\|
	410	nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) {
	411	pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n");
	412	return -EINVAL;
	413	}
	414
	415	entry = nla_data(tb[MDBA_SET_ENTRY]);
	416	if (!is_valid_mdb_entry(entry)) {
	417	pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n");
	418	return -EINVAL;
	419	}
	420
	421	*pentry = entry;
	422	return 0;
	423	}
	424
	425	static int br_mdb_add_group(struct net_bridge br, struct net_bridge_port port,
9e8430f8 ER	426	struct br_ip *group, unsigned char state,
9e8430f8 ER	427	struct net_bridge_port_group **pg)
cfd56754 CW	428	{
	429	struct net_bridge_mdb_entry *mp;
	430	struct net_bridge_port_group *p;
	431	struct net_bridge_port_group __rcu **pp;
	432	struct net_bridge_mdb_htable *mdb;
f7e2965d	433	unsigned long now = jiffies;
cfd56754 CW	434	int err;
	435
	436	mdb = mlock_dereference(br->mdb, br);
	437	mp = br_mdb_ip_get(mdb, group);
	438	if (!mp) {
	439	mp = br_multicast_new_group(br, port, group);
	440	err = PTR_ERR(mp);
	441	if (IS_ERR(mp))
	442	return err;
	443	}
	444
	445	for (pp = &mp->ports;
	446	(p = mlock_dereference(*pp, br)) != NULL;
	447	pp = &p->next) {
	448	if (p->port == port)
	449	return -EEXIST;
	450	if ((unsigned long)p->port < (unsigned long)port)
	451	break;
	452	}
	453
ccb1c31a	454	p = br_multicast_new_port_group(port, group, *pp, state);
cfd56754 CW	455	if (unlikely(!p))
	456	return -ENOMEM;
	457	rcu_assign_pointer(*pp, p);
9e8430f8	458	*pg = p;
f7e2965d SA	459	if (state == MDB_TEMPORARY)
f7e2965d SA	460	mod_timer(&p->timer, now + br->multicast_membership_interval);
cfd56754	461
cfd56754 CW	462	return 0;
	463	}
	464
	465	static int __br_mdb_add(struct net net, struct net_bridge br,
9e8430f8 ER	466	struct br_mdb_entry *entry,
9e8430f8 ER	467	struct net_bridge_port_group **pg)
cfd56754 CW	468	{
	469	struct br_ip ip;
	470	struct net_device *dev;
	471	struct net_bridge_port *p;
	472	int ret;
	473
	474	if (!netif_running(br->dev) \|\| br->multicast_disabled)
	475	return -EINVAL;
	476
	477	dev = __dev_get_by_index(net, entry->ifindex);
	478	if (!dev)
	479	return -ENODEV;
	480
	481	p = br_port_get_rtnl(dev);
	482	if (!p \|\| p->br != br \|\| p->state == BR_STATE_DISABLED)
	483	return -EINVAL;
	484
f1158b74	485	memset(&ip, 0, sizeof(ip));
74fe61f1	486	ip.vid = entry->vid;
cfd56754 CW	487	ip.proto = entry->addr.proto;
	488	if (ip.proto == htons(ETH_P_IP))
	489	ip.u.ip4 = entry->addr.u.ip4;
	490	#if IS_ENABLED(CONFIG_IPV6)
	491	else
	492	ip.u.ip6 = entry->addr.u.ip6;
	493	#endif
	494
	495	spin_lock_bh(&br->multicast_lock);
9e8430f8	496	ret = br_mdb_add_group(br, p, &ip, entry->state, pg);
cfd56754 CW	497	spin_unlock_bh(&br->multicast_lock);
	498	return ret;
	499	}
	500
661d2967	501	static int br_mdb_add(struct sk_buff skb, struct nlmsghdr nlh)
cfd56754 CW	502	{
cfd56754 CW	503	struct net *net = sock_net(skb->sk);
9e8430f8	504	struct net_bridge_port_group *pg;
2594e906	505	struct net_bridge_vlan_group *vg;
e44deb2f	506	struct net_device dev, pdev;
cfd56754	507	struct br_mdb_entry *entry;
e44deb2f	508	struct net_bridge_port *p;
2594e906	509	struct net_bridge_vlan *v;
cfd56754 CW	510	struct net_bridge *br;
	511	int err;
	512
	513	err = br_mdb_parse(skb, nlh, &dev, &entry);
	514	if (err < 0)
	515	return err;
	516
	517	br = netdev_priv(dev);
	518
e44deb2f SA	519	/* If vlan filtering is enabled and VLAN is not specified
	520	* install mdb entry on all vlans configured on the port.
	521	*/
	522	pdev = __dev_get_by_index(net, entry->ifindex);
	523	if (!pdev)
	524	return -ENODEV;
	525
	526	p = br_port_get_rtnl(pdev);
	527	if (!p \|\| p->br != br \|\| p->state == BR_STATE_DISABLED)
	528	return -EINVAL;
	529
2594e906 NA	530	vg = nbp_vlan_group(p);
	531	if (br_vlan_enabled(br) && vg && entry->vid == 0) {
	532	list_for_each_entry(v, &vg->vlan_list, vlist) {
	533	entry->vid = v->vid;
9e8430f8	534	err = __br_mdb_add(net, br, entry, &pg);
e44deb2f SA	535	if (err)
e44deb2f SA	536	break;
9e8430f8	537	__br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
e44deb2f SA	538	}
e44deb2f SA	539	} else {
9e8430f8	540	err = __br_mdb_add(net, br, entry, &pg);
e44deb2f	541	if (!err)
9e8430f8	542	__br_mdb_notify(dev, entry, RTM_NEWMDB, pg);
e44deb2f SA	543	}
e44deb2f SA	544
cfd56754 CW	545	return err;
	546	}
	547
	548	static int __br_mdb_del(struct net_bridge br, struct br_mdb_entry entry)
	549	{
	550	struct net_bridge_mdb_htable *mdb;
	551	struct net_bridge_mdb_entry *mp;
	552	struct net_bridge_port_group *p;
	553	struct net_bridge_port_group __rcu **pp;
	554	struct br_ip ip;
	555	int err = -EINVAL;
	556
	557	if (!netif_running(br->dev) \|\| br->multicast_disabled)
	558	return -EINVAL;
	559
f1158b74	560	memset(&ip, 0, sizeof(ip));
74fe61f1	561	ip.vid = entry->vid;
cfd56754	562	ip.proto = entry->addr.proto;
51ed7f3e	563	if (ip.proto == htons(ETH_P_IP))
cfd56754 CW	564	ip.u.ip4 = entry->addr.u.ip4;
cfd56754 CW	565	#if IS_ENABLED(CONFIG_IPV6)
51ed7f3e	566	else
cfd56754 CW	567	ip.u.ip6 = entry->addr.u.ip6;
	568	#endif
	569
	570	spin_lock_bh(&br->multicast_lock);
	571	mdb = mlock_dereference(br->mdb, br);
	572
	573	mp = br_mdb_ip_get(mdb, &ip);
	574	if (!mp)
	575	goto unlock;
	576
	577	for (pp = &mp->ports;
	578	(p = mlock_dereference(*pp, br)) != NULL;
	579	pp = &p->next) {
	580	if (!p->port \|\| p->port->dev->ifindex != entry->ifindex)
	581	continue;
	582
	583	if (p->port->state == BR_STATE_DISABLED)
	584	goto unlock;
	585
9d06b6d8	586	__mdb_entry_fill_flags(entry, p->flags);
cfd56754 CW	587	rcu_assign_pointer(*pp, p->next);
	588	hlist_del_init(&p->mglist);
	589	del_timer(&p->timer);
	590	call_rcu_bh(&p->rcu, br_multicast_free_pg);
	591	err = 0;
	592
454594f3	593	if (!mp->ports && !mp->mglist &&
cfd56754 CW	594	netif_running(br->dev))
	595	mod_timer(&mp->timer, jiffies);
	596	break;
	597	}
	598
	599	unlock:
	600	spin_unlock_bh(&br->multicast_lock);
	601	return err;
	602	}
	603
661d2967	604	static int br_mdb_del(struct sk_buff skb, struct nlmsghdr nlh)
cfd56754	605	{
e44deb2f	606	struct net *net = sock_net(skb->sk);
2594e906	607	struct net_bridge_vlan_group *vg;
e44deb2f	608	struct net_device dev, pdev;
cfd56754	609	struct br_mdb_entry *entry;
e44deb2f	610	struct net_bridge_port *p;
2594e906	611	struct net_bridge_vlan *v;
cfd56754 CW	612	struct net_bridge *br;
	613	int err;
	614
	615	err = br_mdb_parse(skb, nlh, &dev, &entry);
	616	if (err < 0)
	617	return err;
	618
	619	br = netdev_priv(dev);
	620
e44deb2f SA	621	/* If vlan filtering is enabled and VLAN is not specified
	622	* delete mdb entry on all vlans configured on the port.
	623	*/
	624	pdev = __dev_get_by_index(net, entry->ifindex);
	625	if (!pdev)
	626	return -ENODEV;
	627
	628	p = br_port_get_rtnl(pdev);
	629	if (!p \|\| p->br != br \|\| p->state == BR_STATE_DISABLED)
	630	return -EINVAL;
	631
2594e906 NA	632	vg = nbp_vlan_group(p);
	633	if (br_vlan_enabled(br) && vg && entry->vid == 0) {
	634	list_for_each_entry(v, &vg->vlan_list, vlist) {
	635	entry->vid = v->vid;
e44deb2f SA	636	err = __br_mdb_del(br, entry);
e44deb2f SA	637	if (!err)
9e8430f8	638	__br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
e44deb2f SA	639	}
	640	} else {
	641	err = __br_mdb_del(br, entry);
	642	if (!err)
9e8430f8	643	__br_mdb_notify(dev, entry, RTM_DELMDB, NULL);
e44deb2f SA	644	}
e44deb2f SA	645
cfd56754 CW	646	return err;
	647	}
	648
ee07c6e7 CW	649	void br_mdb_init(void)
	650	{
	651	rtnl_register(PF_BRIDGE, RTM_GETMDB, NULL, br_mdb_dump, NULL);
cfd56754 CW	652	rtnl_register(PF_BRIDGE, RTM_NEWMDB, br_mdb_add, NULL, NULL);
cfd56754 CW	653	rtnl_register(PF_BRIDGE, RTM_DELMDB, br_mdb_del, NULL, NULL);
ee07c6e7	654	}
63233159 VY	655
	656	void br_mdb_uninit(void)
	657	{
	658	rtnl_unregister(PF_BRIDGE, RTM_GETMDB);
	659	rtnl_unregister(PF_BRIDGE, RTM_NEWMDB);
	660	rtnl_unregister(PF_BRIDGE, RTM_DELMDB);
	661	}