[deliverable/linux.git] / net / bridge / br_netlink.c

/*
 *	Bridge netlink control interface
 *
 *	Authors:
 *	Stephen Hemminger		<shemminger@osdl.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 <linux/kernel.h>
#include <linux/slab.h>
#include <linux/etherdevice.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/sock.h>
#include <uapi/linux/if_bridge.h>

#include "br_private.h"
#include "br_private_stp.h"

static inline size_t br_port_info_size(void)
{
	return nla_total_size(1)	/* IFLA_BRPORT_STATE  */
		+ nla_total_size(2)	/* IFLA_BRPORT_PRIORITY */
		+ nla_total_size(4)	/* IFLA_BRPORT_COST */
		+ nla_total_size(1)	/* IFLA_BRPORT_MODE */
		+ nla_total_size(1)	/* IFLA_BRPORT_GUARD */
		+ nla_total_size(1)	/* IFLA_BRPORT_PROTECT */
		+ nla_total_size(1)	/* IFLA_BRPORT_FAST_LEAVE */
		+ nla_total_size(1)	/* IFLA_BRPORT_LEARNING */
		+ nla_total_size(1)	/* IFLA_BRPORT_UNICAST_FLOOD */
		+ 0;
}

static inline size_t br_nlmsg_size(void)
{
	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
		+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
		+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
		+ nla_total_size(4) /* IFLA_MASTER */
		+ nla_total_size(4) /* IFLA_MTU */
		+ nla_total_size(4) /* IFLA_LINK */
		+ nla_total_size(1) /* IFLA_OPERSTATE */
		+ nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
}

static int br_port_fill_attrs(struct sk_buff *skb,
			      const struct net_bridge_port *p)
{
	u8 mode = !!(p->flags & BR_HAIRPIN_MODE);

	if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) ||
	    nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) ||
	    nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) ||
	    nla_put_u8(skb, IFLA_BRPORT_MODE, mode) ||
	    nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) ||
	    nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) ||
	    nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) ||
	    nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) ||
	    nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)))
		return -EMSGSIZE;

	return 0;
}

/*
 * Create one netlink message for one interface
 * Contains port and master info as well as carrier and bridge state.
 */
static int br_fill_ifinfo(struct sk_buff *skb,
			  const struct net_bridge_port *port,
			  u32 pid, u32 seq, int event, unsigned int flags,
			  u32 filter_mask, const struct net_device *dev)
{
	const struct net_bridge *br;
	struct ifinfomsg *hdr;
	struct nlmsghdr *nlh;
	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;

	if (port)
		br = port->br;
	else
		br = netdev_priv(dev);

	br_debug(br, "br_fill_info event %d port %s master %s\n",
		     event, dev->name, br->dev->name);

	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
	if (nlh == NULL)
		return -EMSGSIZE;

	hdr = nlmsg_data(nlh);
	hdr->ifi_family = AF_BRIDGE;
	hdr->__ifi_pad = 0;
	hdr->ifi_type = dev->type;
	hdr->ifi_index = dev->ifindex;
	hdr->ifi_flags = dev_get_flags(dev);
	hdr->ifi_change = 0;

	if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
	    nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) ||
	    nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
	    nla_put_u8(skb, IFLA_OPERSTATE, operstate) ||
	    (dev->addr_len &&
	     nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
	    (dev->ifindex != dev->iflink &&
	     nla_put_u32(skb, IFLA_LINK, dev->iflink)))
		goto nla_put_failure;

	if (event == RTM_NEWLINK && port) {
		struct nlattr *nest
			= nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED);

		if (nest == NULL || br_port_fill_attrs(skb, port) < 0)
			goto nla_put_failure;
		nla_nest_end(skb, nest);
	}

	/* Check if  the VID information is requested */
	if (filter_mask & RTEXT_FILTER_BRVLAN) {
		struct nlattr *af;
		const struct net_port_vlans *pv;
		struct bridge_vlan_info vinfo;
		u16 vid;
		u16 pvid;

		if (port)
			pv = nbp_get_vlan_info(port);
		else
			pv = br_get_vlan_info(br);

		if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
			goto done;

		af = nla_nest_start(skb, IFLA_AF_SPEC);
		if (!af)
			goto nla_put_failure;

		pvid = br_get_pvid(pv);
		for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
			vinfo.vid = vid;
			vinfo.flags = 0;
			if (vid == pvid)
				vinfo.flags |= BRIDGE_VLAN_INFO_PVID;

			if (test_bit(vid, pv->untagged_bitmap))
				vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED;

			if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
				    sizeof(vinfo), &vinfo))
				goto nla_put_failure;
		}

		nla_nest_end(skb, af);
	}

done:
	return nlmsg_end(skb, nlh);

nla_put_failure:
	nlmsg_cancel(skb, nlh);
	return -EMSGSIZE;
}

/*
 * Notify listeners of a change in port information
 */
void br_ifinfo_notify(int event, struct net_bridge_port *port)
{
	struct net *net;
	struct sk_buff *skb;
	int err = -ENOBUFS;

	if (!port)
		return;

	net = dev_net(port->dev);
	br_debug(port->br, "port %u(%s) event %d\n",
		 (unsigned int)port->port_no, port->dev->name, event);

	skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
	if (skb == NULL)
		goto errout;

	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
	if (err < 0) {
		/* -EMSGSIZE implies BUG in br_nlmsg_size() */
		WARN_ON(err == -EMSGSIZE);
		kfree_skb(skb);
		goto errout;
	}
	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
	return;
errout:
	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
}


/*
 * Dump information about all ports, in response to GETLINK
 */
int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
	       struct net_device *dev, u32 filter_mask)
{
	int err = 0;
	struct net_bridge_port *port = br_port_get_rtnl(dev);

	if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
		goto out;

	err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
			     filter_mask, dev);
out:
	return err;
}

static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
	[IFLA_BRIDGE_FLAGS]	= { .type = NLA_U16 },
	[IFLA_BRIDGE_MODE]	= { .type = NLA_U16 },
	[IFLA_BRIDGE_VLAN_INFO]	= { .type = NLA_BINARY,
				    .len = sizeof(struct bridge_vlan_info), },
};

static int br_afspec(struct net_bridge *br,
		     struct net_bridge_port *p,
		     struct nlattr *af_spec,
		     int cmd)
{
	struct nlattr *tb[IFLA_BRIDGE_MAX+1];
	int err = 0;

	err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
	if (err)
		return err;

	if (tb[IFLA_BRIDGE_VLAN_INFO]) {
		struct bridge_vlan_info *vinfo;

		vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);

		if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK)
			return -EINVAL;

		switch (cmd) {
		case RTM_SETLINK:
			if (p) {
				err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
				if (err)
					break;

				if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
					err = br_vlan_add(p->br, vinfo->vid,
							  vinfo->flags);
			} else
				err = br_vlan_add(br, vinfo->vid, vinfo->flags);

			break;

		case RTM_DELLINK:
			if (p) {
				nbp_vlan_delete(p, vinfo->vid);
				if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
					br_vlan_delete(p->br, vinfo->vid);
			} else
				br_vlan_delete(br, vinfo->vid);
			break;
		}
	}

	return err;
}

static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
	[IFLA_BRPORT_STATE]	= { .type = NLA_U8 },
	[IFLA_BRPORT_COST]	= { .type = NLA_U32 },
	[IFLA_BRPORT_PRIORITY]	= { .type = NLA_U16 },
	[IFLA_BRPORT_MODE]	= { .type = NLA_U8 },
	[IFLA_BRPORT_GUARD]	= { .type = NLA_U8 },
	[IFLA_BRPORT_PROTECT]	= { .type = NLA_U8 },
	[IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
	[IFLA_BRPORT_LEARNING]	= { .type = NLA_U8 },
	[IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
};

/* Change the state of the port and notify spanning tree */
static int br_set_port_state(struct net_bridge_port *p, u8 state)
{
	if (state > BR_STATE_BLOCKING)
		return -EINVAL;

	/* if kernel STP is running, don't allow changes */
	if (p->br->stp_enabled == BR_KERNEL_STP)
		return -EBUSY;

	/* if device is not up, change is not allowed
	 * if link is not present, only allowable state is disabled
	 */
	if (!netif_running(p->dev) ||
	    (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
		return -ENETDOWN;

	br_set_state(p, state);
	br_log_state(p);
	br_port_state_selection(p->br);
	return 0;
}

/* Set/clear or port flags based on attribute */
static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[],
			   int attrtype, unsigned long mask)
{
	if (tb[attrtype]) {
		u8 flag = nla_get_u8(tb[attrtype]);
		if (flag)
			p->flags |= mask;
		else
			p->flags &= ~mask;
	}
}

/* Process bridge protocol info on port */
static int br_setport(struct net_bridge_port *p, struct nlattr *tb[])
{
	int err;
	unsigned long old_flags = p->flags;

	br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
	br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
	br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
	br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
	br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
	br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);

	if (tb[IFLA_BRPORT_COST]) {
		err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
		if (err)
			return err;
	}

	if (tb[IFLA_BRPORT_PRIORITY]) {
		err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
		if (err)
			return err;
	}

	if (tb[IFLA_BRPORT_STATE]) {
		err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
		if (err)
			return err;
	}

	br_port_flags_change(p, old_flags ^ p->flags);
	return 0;
}

/* Change state and parameters on port. */
int br_setlink(struct net_device *dev, struct nlmsghdr *nlh)
{
	struct nlattr *protinfo;
	struct nlattr *afspec;
	struct net_bridge_port *p;
	struct nlattr *tb[IFLA_BRPORT_MAX + 1];
	int err = 0;

	protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
	if (!protinfo && !afspec)
		return 0;

	p = br_port_get_rtnl(dev);
	/* We want to accept dev as bridge itself if the AF_SPEC
	 * is set to see if someone is setting vlan info on the bridge
	 */
	if (!p && !afspec)
		return -EINVAL;

	if (p && protinfo) {
		if (protinfo->nla_type & NLA_F_NESTED) {
			err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
					       protinfo, br_port_policy);
			if (err)
				return err;

			spin_lock_bh(&p->br->lock);
			err = br_setport(p, tb);
			spin_unlock_bh(&p->br->lock);
		} else {
			/* Binary compatibility with old RSTP */
			if (nla_len(protinfo) < sizeof(u8))
				return -EINVAL;

			spin_lock_bh(&p->br->lock);
			err = br_set_port_state(p, nla_get_u8(protinfo));
			spin_unlock_bh(&p->br->lock);
		}
		if (err)
			goto out;
	}

	if (afspec) {
		err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
				afspec, RTM_SETLINK);
	}

	if (err == 0)
		br_ifinfo_notify(RTM_NEWLINK, p);

out:
	return err;
}

/* Delete port information */
int br_dellink(struct net_device *dev, struct nlmsghdr *nlh)
{
	struct nlattr *afspec;
	struct net_bridge_port *p;
	int err;

	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
	if (!afspec)
		return 0;

	p = br_port_get_rtnl(dev);
	/* We want to accept dev as bridge itself as well */
	if (!p && !(dev->priv_flags & IFF_EBRIDGE))
		return -EINVAL;

	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
			afspec, RTM_DELLINK);

	return err;
}
static int br_validate(struct nlattr *tb[], struct nlattr *data[])
{
	if (tb[IFLA_ADDRESS]) {
		if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
			return -EINVAL;
		if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
			return -EADDRNOTAVAIL;
	}

	return 0;
}

static int br_dev_newlink(struct net *src_net, struct net_device *dev,
			  struct nlattr *tb[], struct nlattr *data[])
{
	struct net_bridge *br = netdev_priv(dev);

	if (tb[IFLA_ADDRESS]) {
		spin_lock_bh(&br->lock);
		br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
		spin_unlock_bh(&br->lock);
	}

	return register_netdevice(dev);
}

static int br_port_slave_changelink(struct net_device *brdev,
				    struct net_device *dev,
				    struct nlattr *tb[],
				    struct nlattr *data[])
{
	if (!data)
		return 0;
	return br_setport(br_port_get_rtnl(dev), data);
}

static int br_port_fill_slave_info(struct sk_buff *skb,
				   const struct net_device *brdev,
				   const struct net_device *dev)
{
	return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
}

static size_t br_port_get_slave_size(const struct net_device *brdev,
				     const struct net_device *dev)
{
	return br_port_info_size();
}

static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
	[IFLA_BR_FORWARD_DELAY]	= { .type = NLA_U32 },
	[IFLA_BR_HELLO_TIME]	= { .type = NLA_U32 },
	[IFLA_BR_MAX_AGE]	= { .type = NLA_U32 },
};

static int br_changelink(struct net_device *brdev, struct nlattr *tb[],
			 struct nlattr *data[])
{
	struct net_bridge *br = netdev_priv(brdev);
	int err;

	if (!data)
		return 0;

	if (data[IFLA_BR_FORWARD_DELAY]) {
		err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
		if (err)
			return err;
	}

	if (data[IFLA_BR_HELLO_TIME]) {
		err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
		if (err)
			return err;
	}

	if (data[IFLA_BR_MAX_AGE]) {
		err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
		if (err)
			return err;
	}

	return 0;
}

static size_t br_get_size(const struct net_device *brdev)
{
	return nla_total_size(sizeof(u32)) +	/* IFLA_BR_FORWARD_DELAY  */
	       nla_total_size(sizeof(u32)) +	/* IFLA_BR_HELLO_TIME */
	       nla_total_size(sizeof(u32)) +	/* IFLA_BR_MAX_AGE */
	       0;
}

static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev)
{
	struct net_bridge *br = netdev_priv(brdev);
	u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
	u32 hello_time = jiffies_to_clock_t(br->hello_time);
	u32 age_time = jiffies_to_clock_t(br->max_age);

	if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) ||
	    nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) ||
	    nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
		return -EMSGSIZE;

	return 0;
}

static size_t br_get_link_af_size(const struct net_device *dev)
{
	struct net_port_vlans *pv;

	if (br_port_exists(dev))
		pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
	else if (dev->priv_flags & IFF_EBRIDGE)
		pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
	else
		return 0;

	if (!pv)
		return 0;

	/* Each VLAN is returned in bridge_vlan_info along with flags */
	return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
}

static struct rtnl_af_ops br_af_ops = {
	.family			= AF_BRIDGE,
	.get_link_af_size	= br_get_link_af_size,
};

struct rtnl_link_ops br_link_ops __read_mostly = {
	.kind			= "bridge",
	.priv_size		= sizeof(struct net_bridge),
	.setup			= br_dev_setup,
	.maxtype		= IFLA_BRPORT_MAX,
	.policy			= br_policy,
	.validate		= br_validate,
	.newlink		= br_dev_newlink,
	.changelink		= br_changelink,
	.dellink		= br_dev_delete,
	.get_size		= br_get_size,
	.fill_info		= br_fill_info,

	.slave_maxtype		= IFLA_BRPORT_MAX,
	.slave_policy		= br_port_policy,
	.slave_changelink	= br_port_slave_changelink,
	.get_slave_size		= br_port_get_slave_size,
	.fill_slave_info	= br_port_fill_slave_info,
};

int __init br_netlink_init(void)
{
	int err;

	br_mdb_init();
	rtnl_af_register(&br_af_ops);

	err = rtnl_link_register(&br_link_ops);
	if (err)
		goto out_af;

	return 0;

out_af:
	rtnl_af_unregister(&br_af_ops);
	br_mdb_uninit();
	return err;
}

void br_netlink_fini(void)
{
	br_mdb_uninit();
	rtnl_af_unregister(&br_af_ops);
	rtnl_link_unregister(&br_link_ops);
}
Commit	Line	Data
11dc1f36 SH	1	/*
	2	* Bridge netlink control interface
	3	*
	4	* Authors:
	5	* Stephen Hemminger <shemminger@osdl.org>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12
	13	#include <linux/kernel.h>
5a0e3ad6	14	#include <linux/slab.h>
bb900b27	15	#include <linux/etherdevice.h>
32fe21c0	16	#include <net/rtnetlink.h>
881d966b	17	#include <net/net_namespace.h>
b854272b	18	#include <net/sock.h>
407af329	19	#include <uapi/linux/if_bridge.h>
bb900b27	20
11dc1f36	21	#include "br_private.h"
b03b6dd5	22	#include "br_private_stp.h"
11dc1f36	23
25c71c75	24	static inline size_t br_port_info_size(void)
	25	{
	26	return nla_total_size(1) /* IFLA_BRPORT_STATE */
	27	+ nla_total_size(2) /* IFLA_BRPORT_PRIORITY */
	28	+ nla_total_size(4) /* IFLA_BRPORT_COST */
	29	+ nla_total_size(1) /* IFLA_BRPORT_MODE */
a2e01a65	30	+ nla_total_size(1) /* IFLA_BRPORT_GUARD */
1007dd1a	31	+ nla_total_size(1) /* IFLA_BRPORT_PROTECT */
3da889b6	32	+ nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */
9ba18891	33	+ nla_total_size(1) /* IFLA_BRPORT_LEARNING */
867a5943	34	+ nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */
25c71c75	35	+ 0;
	36	}
	37
339bf98f TG	38	static inline size_t br_nlmsg_size(void)
	39	{
	40	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
25c71c75	41	+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
	42	+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
	43	+ nla_total_size(4) /* IFLA_MASTER */
	44	+ nla_total_size(4) /* IFLA_MTU */
	45	+ nla_total_size(4) /* IFLA_LINK */
	46	+ nla_total_size(1) /* IFLA_OPERSTATE */
	47	+ nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
	48	}
	49
	50	static int br_port_fill_attrs(struct sk_buff *skb,
	51	const struct net_bridge_port *p)
	52	{
	53	u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
	54
	55	if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) \|\|
	56	nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) \|\|
	57	nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) \|\|
a2e01a65	58	nla_put_u8(skb, IFLA_BRPORT_MODE, mode) \|\|
1007dd1a	59	nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) \|\|
c2d3babf	60	nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) \|\|
9ba18891	61	nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) \|\|
867a5943 VY	62	nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) \|\|
867a5943 VY	63	nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)))
25c71c75	64	return -EMSGSIZE;
	65
	66	return 0;
339bf98f TG	67	}
339bf98f TG	68
11dc1f36 SH	69	/*
	70	* Create one netlink message for one interface
	71	* Contains port and master info as well as carrier and bridge state.
	72	*/
6cbdceeb VY	73	static int br_fill_ifinfo(struct sk_buff *skb,
	74	const struct net_bridge_port *port,
	75	u32 pid, u32 seq, int event, unsigned int flags,
	76	u32 filter_mask, const struct net_device *dev)
11dc1f36	77	{
6cbdceeb	78	const struct net_bridge *br;
74685962	79	struct ifinfomsg *hdr;
11dc1f36	80	struct nlmsghdr *nlh;
11dc1f36	81	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
11dc1f36	82
6cbdceeb VY	83	if (port)
	84	br = port->br;
	85	else
	86	br = netdev_priv(dev);
	87
28a16c97	88	br_debug(br, "br_fill_info event %d port %s master %s\n",
28a16c97	89	event, dev->name, br->dev->name);
11dc1f36	90
74685962 TG	91	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
74685962 TG	92	if (nlh == NULL)
26932566	93	return -EMSGSIZE;
11dc1f36	94
74685962 TG	95	hdr = nlmsg_data(nlh);
	96	hdr->ifi_family = AF_BRIDGE;
	97	hdr->__ifi_pad = 0;
	98	hdr->ifi_type = dev->type;
	99	hdr->ifi_index = dev->ifindex;
	100	hdr->ifi_flags = dev_get_flags(dev);
	101	hdr->ifi_change = 0;
11dc1f36	102
2eb812e6 DM	103	if (nla_put_string(skb, IFLA_IFNAME, dev->name) \|\|
	104	nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) \|\|
	105	nla_put_u32(skb, IFLA_MTU, dev->mtu) \|\|
	106	nla_put_u8(skb, IFLA_OPERSTATE, operstate) \|\|
	107	(dev->addr_len &&
	108	nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) \|\|
	109	(dev->ifindex != dev->iflink &&
25c71c75	110	nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2eb812e6	111	goto nla_put_failure;
25c71c75	112
6cbdceeb	113	if (event == RTM_NEWLINK && port) {
25c71c75	114	struct nlattr *nest
	115	= nla_nest_start(skb, IFLA_PROTINFO \| NLA_F_NESTED);
	116
	117	if (nest == NULL \|\| br_port_fill_attrs(skb, port) < 0)
	118	goto nla_put_failure;
	119	nla_nest_end(skb, nest);
	120	}
	121
6cbdceeb VY	122	/* Check if the VID information is requested */
	123	if (filter_mask & RTEXT_FILTER_BRVLAN) {
	124	struct nlattr *af;
	125	const struct net_port_vlans *pv;
	126	struct bridge_vlan_info vinfo;
	127	u16 vid;
552406c4	128	u16 pvid;
6cbdceeb VY	129
	130	if (port)
	131	pv = nbp_get_vlan_info(port);
	132	else
	133	pv = br_get_vlan_info(br);
	134
ef40b7ef	135	if (!pv \|\| bitmap_empty(pv->vlan_bitmap, VLAN_N_VID))
6cbdceeb VY	136	goto done;
	137
	138	af = nla_nest_start(skb, IFLA_AF_SPEC);
	139	if (!af)
	140	goto nla_put_failure;
	141
552406c4	142	pvid = br_get_pvid(pv);
ef40b7ef	143	for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) {
6cbdceeb VY	144	vinfo.vid = vid;
6cbdceeb VY	145	vinfo.flags = 0;
552406c4 VY	146	if (vid == pvid)
552406c4 VY	147	vinfo.flags \|= BRIDGE_VLAN_INFO_PVID;
35e03f3a VY	148
	149	if (test_bit(vid, pv->untagged_bitmap))
	150	vinfo.flags \|= BRIDGE_VLAN_INFO_UNTAGGED;
	151
6cbdceeb VY	152	if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
	153	sizeof(vinfo), &vinfo))
	154	goto nla_put_failure;
	155	}
	156
	157	nla_nest_end(skb, af);
	158	}
	159
	160	done:
74685962	161	return nlmsg_end(skb, nlh);
11dc1f36	162
74685962	163	nla_put_failure:
26932566 PM	164	nlmsg_cancel(skb, nlh);
26932566 PM	165	return -EMSGSIZE;
11dc1f36 SH	166	}
	167
	168	/*
	169	* Notify listeners of a change in port information
	170	*/
	171	void br_ifinfo_notify(int event, struct net_bridge_port *port)
	172	{
407af329	173	struct net *net;
11dc1f36	174	struct sk_buff *skb;
280a306c	175	int err = -ENOBUFS;
11dc1f36	176
407af329 VY	177	if (!port)
	178	return;
	179
	180	net = dev_net(port->dev);
28a16c97	181	br_debug(port->br, "port %u(%s) event %d\n",
95c96174	182	(unsigned int)port->port_no, port->dev->name, event);
28a16c97	183
339bf98f	184	skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
280a306c TG	185	if (skb == NULL)
	186	goto errout;
	187
6cbdceeb	188	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
26932566 PM	189	if (err < 0) {
	190	/* -EMSGSIZE implies BUG in br_nlmsg_size() */
	191	WARN_ON(err == -EMSGSIZE);
	192	kfree_skb(skb);
	193	goto errout;
	194	}
1ce85fe4 PNA	195	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
1ce85fe4 PNA	196	return;
280a306c	197	errout:
87e823b3	198	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
11dc1f36 SH	199	}
11dc1f36 SH	200
407af329	201
11dc1f36 SH	202	/*
	203	* Dump information about all ports, in response to GETLINK
	204	*/
e5a55a89	205	int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
6cbdceeb	206	struct net_device *dev, u32 filter_mask)
11dc1f36	207	{
e5a55a89	208	int err = 0;
1fb1754a	209	struct net_bridge_port *port = br_port_get_rtnl(dev);
e5a55a89	210
6cbdceeb	211	if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
e5a55a89	212	goto out;
11dc1f36	213
6cbdceeb VY	214	err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
6cbdceeb VY	215	filter_mask, dev);
e5a55a89 JF	216	out:
e5a55a89 JF	217	return err;
11dc1f36 SH	218	}
11dc1f36 SH	219
15004cab	220	static const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
407af329 VY	221	[IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 },
	222	[IFLA_BRIDGE_MODE] = { .type = NLA_U16 },
	223	[IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
	224	.len = sizeof(struct bridge_vlan_info), },
	225	};
	226
	227	static int br_afspec(struct net_bridge *br,
	228	struct net_bridge_port *p,
	229	struct nlattr *af_spec,
	230	int cmd)
	231	{
	232	struct nlattr *tb[IFLA_BRIDGE_MAX+1];
	233	int err = 0;
	234
	235	err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
	236	if (err)
	237	return err;
	238
	239	if (tb[IFLA_BRIDGE_VLAN_INFO]) {
	240	struct bridge_vlan_info *vinfo;
	241
	242	vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
	243
8adff41c	244	if (!vinfo->vid \|\| vinfo->vid >= VLAN_VID_MASK)
407af329 VY	245	return -EINVAL;
	246
	247	switch (cmd) {
	248	case RTM_SETLINK:
	249	if (p) {
552406c4	250	err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
407af329 VY	251	if (err)
	252	break;
	253
	254	if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
552406c4 VY	255	err = br_vlan_add(p->br, vinfo->vid,
552406c4 VY	256	vinfo->flags);
407af329	257	} else
552406c4	258	err = br_vlan_add(br, vinfo->vid, vinfo->flags);
407af329	259
407af329 VY	260	break;
	261
	262	case RTM_DELLINK:
	263	if (p) {
	264	nbp_vlan_delete(p, vinfo->vid);
	265	if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
	266	br_vlan_delete(p->br, vinfo->vid);
	267	} else
	268	br_vlan_delete(br, vinfo->vid);
	269	break;
	270	}
	271	}
	272
	273	return err;
	274	}
	275
3ac636b8	276	static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = {
25c71c75	277	[IFLA_BRPORT_STATE] = { .type = NLA_U8 },
	278	[IFLA_BRPORT_COST] = { .type = NLA_U32 },
	279	[IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
	280	[IFLA_BRPORT_MODE] = { .type = NLA_U8 },
a2e01a65	281	[IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
1007dd1a	282	[IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
6f705d8c	283	[IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 },
9ba18891	284	[IFLA_BRPORT_LEARNING] = { .type = NLA_U8 },
867a5943	285	[IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 },
25c71c75	286	};
	287
	288	/* Change the state of the port and notify spanning tree */
	289	static int br_set_port_state(struct net_bridge_port *p, u8 state)
	290	{
	291	if (state > BR_STATE_BLOCKING)
	292	return -EINVAL;
	293
	294	/* if kernel STP is running, don't allow changes */
	295	if (p->br->stp_enabled == BR_KERNEL_STP)
	296	return -EBUSY;
	297
576eb625	298	/* if device is not up, change is not allowed
	299	* if link is not present, only allowable state is disabled
	300	*/
25c71c75	301	if (!netif_running(p->dev) \|\|
576eb625	302	(!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
25c71c75	303	return -ENETDOWN;
25c71c75	304
775dd692	305	br_set_state(p, state);
25c71c75	306	br_log_state(p);
	307	br_port_state_selection(p->br);
	308	return 0;
	309	}
	310
	311	/* Set/clear or port flags based on attribute */
	312	static void br_set_port_flag(struct net_bridge_port p, struct nlattr tb[],
	313	int attrtype, unsigned long mask)
	314	{
	315	if (tb[attrtype]) {
	316	u8 flag = nla_get_u8(tb[attrtype]);
	317	if (flag)
	318	p->flags \|= mask;
	319	else
	320	p->flags &= ~mask;
	321	}
	322	}
	323
	324	/* Process bridge protocol info on port */
	325	static int br_setport(struct net_bridge_port p, struct nlattr tb[])
	326	{
	327	int err;
e028e4b8	328	unsigned long old_flags = p->flags;
25c71c75	329
25c71c75	330	br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
a2e01a65	331	br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
c2d3babf	332	br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
3d84fa98	333	br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK);
9ba18891	334	br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING);
867a5943	335	br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD);
25c71c75	336
	337	if (tb[IFLA_BRPORT_COST]) {
	338	err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
	339	if (err)
	340	return err;
	341	}
	342
	343	if (tb[IFLA_BRPORT_PRIORITY]) {
	344	err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
	345	if (err)
	346	return err;
	347	}
	348
	349	if (tb[IFLA_BRPORT_STATE]) {
	350	err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
	351	if (err)
	352	return err;
	353	}
e028e4b8 VY	354
e028e4b8 VY	355	br_port_flags_change(p, old_flags ^ p->flags);
25c71c75	356	return 0;
	357	}
	358
	359	/* Change state and parameters on port. */
e5a55a89	360	int br_setlink(struct net_device dev, struct nlmsghdr nlh)
11dc1f36	361	{
74685962	362	struct nlattr *protinfo;
407af329	363	struct nlattr *afspec;
11dc1f36	364	struct net_bridge_port *p;
2062cc20	365	struct nlattr *tb[IFLA_BRPORT_MAX + 1];
7b99a993	366	int err = 0;
11dc1f36	367
c60ee67f H	368	protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO);
c60ee67f H	369	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
407af329	370	if (!protinfo && !afspec)
25c71c75	371	return 0;
11dc1f36	372
ec1e5610	373	p = br_port_get_rtnl(dev);
407af329	374	/* We want to accept dev as bridge itself if the AF_SPEC
8e3bff96	375	* is set to see if someone is setting vlan info on the bridge
407af329	376	*/
7b99a993	377	if (!p && !afspec)
b5ed54e9	378	return -EINVAL;
11dc1f36	379
407af329 VY	380	if (p && protinfo) {
	381	if (protinfo->nla_type & NLA_F_NESTED) {
	382	err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
3ac636b8	383	protinfo, br_port_policy);
407af329 VY	384	if (err)
	385	return err;
	386
	387	spin_lock_bh(&p->br->lock);
	388	err = br_setport(p, tb);
	389	spin_unlock_bh(&p->br->lock);
	390	} else {
8e3bff96	391	/* Binary compatibility with old RSTP */
407af329 VY	392	if (nla_len(protinfo) < sizeof(u8))
	393	return -EINVAL;
	394
	395	spin_lock_bh(&p->br->lock);
	396	err = br_set_port_state(p, nla_get_u8(protinfo));
	397	spin_unlock_bh(&p->br->lock);
	398	}
25c71c75	399	if (err)
407af329 VY	400	goto out;
407af329 VY	401	}
11dc1f36	402
407af329 VY	403	if (afspec) {
	404	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
	405	afspec, RTM_SETLINK);
25c71c75	406	}
b03b6dd5	407
25c71c75	408	if (err == 0)
25c71c75	409	br_ifinfo_notify(RTM_NEWLINK, p);
b03b6dd5	410
407af329	411	out:
25c71c75	412	return err;
11dc1f36 SH	413	}
11dc1f36 SH	414
407af329 VY	415	/* Delete port information */
	416	int br_dellink(struct net_device dev, struct nlmsghdr nlh)
	417	{
407af329 VY	418	struct nlattr *afspec;
	419	struct net_bridge_port *p;
	420	int err;
	421
c60ee67f	422	afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
407af329 VY	423	if (!afspec)
	424	return 0;
	425
	426	p = br_port_get_rtnl(dev);
	427	/* We want to accept dev as bridge itself as well */
	428	if (!p && !(dev->priv_flags & IFF_EBRIDGE))
	429	return -EINVAL;
	430
	431	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
	432	afspec, RTM_DELLINK);
	433
	434	return err;
	435	}
bb900b27	436	static int br_validate(struct nlattr tb[], struct nlattr data[])
	437	{
	438	if (tb[IFLA_ADDRESS]) {
	439	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	440	return -EINVAL;
	441	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	442	return -EADDRNOTAVAIL;
	443	}
	444
	445	return 0;
	446	}
	447
30313a3d TM	448	static int br_dev_newlink(struct net src_net, struct net_device dev,
	449	struct nlattr tb[], struct nlattr data[])
	450	{
	451	struct net_bridge *br = netdev_priv(dev);
	452
	453	if (tb[IFLA_ADDRESS]) {
	454	spin_lock_bh(&br->lock);
	455	br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS]));
	456	spin_unlock_bh(&br->lock);
	457	}
	458
	459	return register_netdevice(dev);
	460	}
	461
3ac636b8 JP	462	static int br_port_slave_changelink(struct net_device *brdev,
	463	struct net_device *dev,
	464	struct nlattr *tb[],
	465	struct nlattr *data[])
	466	{
	467	if (!data)
	468	return 0;
	469	return br_setport(br_port_get_rtnl(dev), data);
	470	}
	471
ced8283f JP	472	static int br_port_fill_slave_info(struct sk_buff *skb,
	473	const struct net_device *brdev,
	474	const struct net_device *dev)
	475	{
	476	return br_port_fill_attrs(skb, br_port_get_rtnl(dev));
	477	}
	478
	479	static size_t br_port_get_slave_size(const struct net_device *brdev,
	480	const struct net_device *dev)
	481	{
	482	return br_port_info_size();
	483	}
	484
13323516 JP	485	static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = {
	486	[IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 },
	487	[IFLA_BR_HELLO_TIME] = { .type = NLA_U32 },
	488	[IFLA_BR_MAX_AGE] = { .type = NLA_U32 },
	489	};
	490
	491	static int br_changelink(struct net_device brdev, struct nlattr tb[],
	492	struct nlattr *data[])
	493	{
	494	struct net_bridge *br = netdev_priv(brdev);
	495	int err;
	496
	497	if (!data)
	498	return 0;
	499
	500	if (data[IFLA_BR_FORWARD_DELAY]) {
	501	err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY]));
	502	if (err)
	503	return err;
	504	}
	505
	506	if (data[IFLA_BR_HELLO_TIME]) {
	507	err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME]));
	508	if (err)
	509	return err;
	510	}
	511
	512	if (data[IFLA_BR_MAX_AGE]) {
	513	err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE]));
	514	if (err)
	515	return err;
	516	}
	517
	518	return 0;
	519	}
	520
e5c3ea5c JP	521	static size_t br_get_size(const struct net_device *brdev)
	522	{
	523	return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */
	524	nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */
	525	nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */
	526	0;
	527	}
	528
	529	static int br_fill_info(struct sk_buff skb, const struct net_device brdev)
	530	{
	531	struct net_bridge *br = netdev_priv(brdev);
	532	u32 forward_delay = jiffies_to_clock_t(br->forward_delay);
	533	u32 hello_time = jiffies_to_clock_t(br->hello_time);
	534	u32 age_time = jiffies_to_clock_t(br->max_age);
	535
	536	if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) \|\|
	537	nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) \|\|
	538	nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time))
	539	return -EMSGSIZE;
	540
	541	return 0;
	542	}
	543
6cbdceeb VY	544	static size_t br_get_link_af_size(const struct net_device *dev)
	545	{
	546	struct net_port_vlans *pv;
	547
	548	if (br_port_exists(dev))
1fb1754a	549	pv = nbp_get_vlan_info(br_port_get_rtnl(dev));
6cbdceeb VY	550	else if (dev->priv_flags & IFF_EBRIDGE)
	551	pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
	552	else
	553	return 0;
	554
	555	if (!pv)
	556	return 0;
	557
	558	/* Each VLAN is returned in bridge_vlan_info along with flags */
	559	return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
	560	}
	561
15004cab	562	static struct rtnl_af_ops br_af_ops = {
6cbdceeb VY	563	.family = AF_BRIDGE,
	564	.get_link_af_size = br_get_link_af_size,
	565	};
	566
149ddd83	567	struct rtnl_link_ops br_link_ops __read_mostly = {
ced8283f JP	568	.kind = "bridge",
	569	.priv_size = sizeof(struct net_bridge),
	570	.setup = br_dev_setup,
13323516 JP	571	.maxtype = IFLA_BRPORT_MAX,
13323516 JP	572	.policy = br_policy,
ced8283f JP	573	.validate = br_validate,
ced8283f JP	574	.newlink = br_dev_newlink,
13323516	575	.changelink = br_changelink,
ced8283f	576	.dellink = br_dev_delete,
e5c3ea5c JP	577	.get_size = br_get_size,
e5c3ea5c JP	578	.fill_info = br_fill_info,
3ac636b8 JP	579
	580	.slave_maxtype = IFLA_BRPORT_MAX,
	581	.slave_policy = br_port_policy,
	582	.slave_changelink = br_port_slave_changelink,
ced8283f JP	583	.get_slave_size = br_port_get_slave_size,
ced8283f JP	584	.fill_slave_info = br_port_fill_slave_info,
bb900b27	585	};
11dc1f36	586
32fe21c0	587	int __init br_netlink_init(void)
11dc1f36	588	{
3ec8e9f0 VY	589	int err;
	590
	591	br_mdb_init();
3678a9d8	592	rtnl_af_register(&br_af_ops);
3ec8e9f0	593
6cbdceeb VY	594	err = rtnl_link_register(&br_link_ops);
	595	if (err)
	596	goto out_af;
	597
3ec8e9f0	598	return 0;
6cbdceeb VY	599
	600	out_af:
	601	rtnl_af_unregister(&br_af_ops);
3ec8e9f0 VY	602	br_mdb_uninit();
3ec8e9f0 VY	603	return err;
11dc1f36 SH	604	}
11dc1f36 SH	605
34666d46	606	void br_netlink_fini(void)
11dc1f36	607	{
3ec8e9f0	608	br_mdb_uninit();
6cbdceeb	609	rtnl_af_unregister(&br_af_ops);
bb900b27	610	rtnl_link_unregister(&br_link_ops);
11dc1f36	611	}