[mirror_ubuntu-artful-kernel.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 */
		+ 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)))
		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)
{
	const struct net_bridge *br = port->br;
	const struct net_device *dev = port->dev;
	struct ifinfomsg *hdr;
	struct nlmsghdr *nlh;
	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;

	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) {
		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);
	}

	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);
	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:
	if (err < 0)
		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)
{
	int err = 0;
	struct net_bridge_port *port = br_port_get_rcu(dev);

	/* not a bridge port */
	if (!port)
		goto out;

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

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 >= VLAN_N_VID)
			return -EINVAL;

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

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

			if (err)
				break;

			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 ifla_brport_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 },
};

/* 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;

	p->state = 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;

	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);

	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;
	}
	return 0;
}

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

	ifm = nlmsg_data(nlh);

	protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
	afspec = nlmsg_find_attr(nlh, sizeof(*ifm), 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 brigde
	 */
	if (!p && ((dev->priv_flags & IFF_EBRIDGE) && !afspec))
		return -EINVAL;

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

			spin_lock_bh(&p->br->lock);
			err = br_setport(p, tb);
			spin_unlock_bh(&p->br->lock);
		} else {
			/* Binary compatability 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 ifinfomsg *ifm;
	struct nlattr *afspec;
	struct net_bridge_port *p;
	int err;

	ifm = nlmsg_data(nlh);

	afspec = nlmsg_find_attr(nlh, sizeof(*ifm), 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;
}

struct rtnl_link_ops br_link_ops __read_mostly = {
	.kind		= "bridge",
	.priv_size	= sizeof(struct net_bridge),
	.setup		= br_dev_setup,
	.validate	= br_validate,
	.dellink	= br_dev_delete,
};

int __init br_netlink_init(void)
{
	int err;

	br_mdb_init();
	err = rtnl_link_register(&br_link_ops);
	if (err)
		goto out;

	return 0;
out:
	br_mdb_uninit();
	return err;
}

void __exit br_netlink_fini(void)
{
	br_mdb_uninit();
	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 */
25c71c75	32	+ 0;
	33	}
	34
339bf98f TG	35	static inline size_t br_nlmsg_size(void)
	36	{
	37	return NLMSG_ALIGN(sizeof(struct ifinfomsg))
25c71c75	38	+ nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
	39	+ nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
	40	+ nla_total_size(4) /* IFLA_MASTER */
	41	+ nla_total_size(4) /* IFLA_MTU */
	42	+ nla_total_size(4) /* IFLA_LINK */
	43	+ nla_total_size(1) /* IFLA_OPERSTATE */
	44	+ nla_total_size(br_port_info_size()); /* IFLA_PROTINFO */
	45	}
	46
	47	static int br_port_fill_attrs(struct sk_buff *skb,
	48	const struct net_bridge_port *p)
	49	{
	50	u8 mode = !!(p->flags & BR_HAIRPIN_MODE);
	51
	52	if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) \|\|
	53	nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) \|\|
	54	nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) \|\|
a2e01a65	55	nla_put_u8(skb, IFLA_BRPORT_MODE, mode) \|\|
1007dd1a	56	nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) \|\|
c2d3babf DM	57	nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) \|\|
c2d3babf DM	58	nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)))
25c71c75	59	return -EMSGSIZE;
	60
	61	return 0;
339bf98f TG	62	}
339bf98f TG	63
11dc1f36 SH	64	/*
	65	* Create one netlink message for one interface
	66	* Contains port and master info as well as carrier and bridge state.
	67	*/
	68	static int br_fill_ifinfo(struct sk_buff skb, const struct net_bridge_port port,
	69	u32 pid, u32 seq, int event, unsigned int flags)
	70	{
	71	const struct net_bridge *br = port->br;
	72	const struct net_device *dev = port->dev;
74685962	73	struct ifinfomsg *hdr;
11dc1f36	74	struct nlmsghdr *nlh;
11dc1f36	75	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
11dc1f36	76
28a16c97	77	br_debug(br, "br_fill_info event %d port %s master %s\n",
28a16c97	78	event, dev->name, br->dev->name);
11dc1f36	79
74685962 TG	80	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
74685962 TG	81	if (nlh == NULL)
26932566	82	return -EMSGSIZE;
11dc1f36	83
74685962 TG	84	hdr = nlmsg_data(nlh);
	85	hdr->ifi_family = AF_BRIDGE;
	86	hdr->__ifi_pad = 0;
	87	hdr->ifi_type = dev->type;
	88	hdr->ifi_index = dev->ifindex;
	89	hdr->ifi_flags = dev_get_flags(dev);
	90	hdr->ifi_change = 0;
11dc1f36	91
2eb812e6 DM	92	if (nla_put_string(skb, IFLA_IFNAME, dev->name) \|\|
	93	nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) \|\|
	94	nla_put_u32(skb, IFLA_MTU, dev->mtu) \|\|
	95	nla_put_u8(skb, IFLA_OPERSTATE, operstate) \|\|
	96	(dev->addr_len &&
	97	nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) \|\|
	98	(dev->ifindex != dev->iflink &&
25c71c75	99	nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2eb812e6	100	goto nla_put_failure;
25c71c75	101
	102	if (event == RTM_NEWLINK) {
	103	struct nlattr *nest
	104	= nla_nest_start(skb, IFLA_PROTINFO \| NLA_F_NESTED);
	105
	106	if (nest == NULL \|\| br_port_fill_attrs(skb, port) < 0)
	107	goto nla_put_failure;
	108	nla_nest_end(skb, nest);
	109	}
	110
74685962	111	return nlmsg_end(skb, nlh);
11dc1f36	112
74685962	113	nla_put_failure:
26932566 PM	114	nlmsg_cancel(skb, nlh);
26932566 PM	115	return -EMSGSIZE;
11dc1f36 SH	116	}
	117
	118	/*
	119	* Notify listeners of a change in port information
	120	*/
	121	void br_ifinfo_notify(int event, struct net_bridge_port *port)
	122	{
407af329	123	struct net *net;
11dc1f36	124	struct sk_buff *skb;
280a306c	125	int err = -ENOBUFS;
11dc1f36	126
407af329 VY	127	if (!port)
	128	return;
	129
	130	net = dev_net(port->dev);
28a16c97	131	br_debug(port->br, "port %u(%s) event %d\n",
95c96174	132	(unsigned int)port->port_no, port->dev->name, event);
28a16c97	133
339bf98f	134	skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
280a306c TG	135	if (skb == NULL)
	136	goto errout;
	137
	138	err = br_fill_ifinfo(skb, port, 0, 0, event, 0);
26932566 PM	139	if (err < 0) {
	140	/* -EMSGSIZE implies BUG in br_nlmsg_size() */
	141	WARN_ON(err == -EMSGSIZE);
	142	kfree_skb(skb);
	143	goto errout;
	144	}
1ce85fe4 PNA	145	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
1ce85fe4 PNA	146	return;
280a306c	147	errout:
bea1b42e	148	if (err < 0)
4aa678ba	149	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
11dc1f36 SH	150	}
11dc1f36 SH	151
407af329	152
11dc1f36 SH	153	/*
	154	* Dump information about all ports, in response to GETLINK
	155	*/
e5a55a89 JF	156	int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
e5a55a89 JF	157	struct net_device *dev)
11dc1f36	158	{
e5a55a89 JF	159	int err = 0;
	160	struct net_bridge_port *port = br_port_get_rcu(dev);
	161
	162	/* not a bridge port */
	163	if (!port)
	164	goto out;
11dc1f36	165
e5a55a89 JF	166	err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI);
	167	out:
	168	return err;
11dc1f36 SH	169	}
11dc1f36 SH	170
407af329 VY	171	const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
	172	[IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 },
	173	[IFLA_BRIDGE_MODE] = { .type = NLA_U16 },
	174	[IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
	175	.len = sizeof(struct bridge_vlan_info), },
	176	};
	177
	178	static int br_afspec(struct net_bridge *br,
	179	struct net_bridge_port *p,
	180	struct nlattr *af_spec,
	181	int cmd)
	182	{
	183	struct nlattr *tb[IFLA_BRIDGE_MAX+1];
	184	int err = 0;
	185
	186	err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
	187	if (err)
	188	return err;
	189
	190	if (tb[IFLA_BRIDGE_VLAN_INFO]) {
	191	struct bridge_vlan_info *vinfo;
	192
	193	vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
	194
	195	if (vinfo->vid >= VLAN_N_VID)
	196	return -EINVAL;
	197
	198	switch (cmd) {
	199	case RTM_SETLINK:
	200	if (p) {
	201	err = nbp_vlan_add(p, vinfo->vid);
	202	if (err)
	203	break;
	204
	205	if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
	206	err = br_vlan_add(p->br, vinfo->vid);
	207	} else
	208	err = br_vlan_add(br, vinfo->vid);
	209
	210	if (err)
	211	break;
	212
	213	break;
	214
	215	case RTM_DELLINK:
	216	if (p) {
	217	nbp_vlan_delete(p, vinfo->vid);
	218	if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
	219	br_vlan_delete(p->br, vinfo->vid);
	220	} else
	221	br_vlan_delete(br, vinfo->vid);
	222	break;
	223	}
	224	}
	225
	226	return err;
	227	}
	228
25c71c75	229	static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
	230	[IFLA_BRPORT_STATE] = { .type = NLA_U8 },
	231	[IFLA_BRPORT_COST] = { .type = NLA_U32 },
	232	[IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
	233	[IFLA_BRPORT_MODE] = { .type = NLA_U8 },
a2e01a65	234	[IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
1007dd1a	235	[IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
25c71c75	236	};
	237
	238	/* Change the state of the port and notify spanning tree */
	239	static int br_set_port_state(struct net_bridge_port *p, u8 state)
	240	{
	241	if (state > BR_STATE_BLOCKING)
	242	return -EINVAL;
	243
	244	/* if kernel STP is running, don't allow changes */
	245	if (p->br->stp_enabled == BR_KERNEL_STP)
	246	return -EBUSY;
	247
576eb625	248	/* if device is not up, change is not allowed
	249	* if link is not present, only allowable state is disabled
	250	*/
25c71c75	251	if (!netif_running(p->dev) \|\|
576eb625	252	(!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
25c71c75	253	return -ENETDOWN;
	254
	255	p->state = state;
	256	br_log_state(p);
	257	br_port_state_selection(p->br);
	258	return 0;
	259	}
	260
	261	/* Set/clear or port flags based on attribute */
	262	static void br_set_port_flag(struct net_bridge_port p, struct nlattr tb[],
	263	int attrtype, unsigned long mask)
	264	{
	265	if (tb[attrtype]) {
	266	u8 flag = nla_get_u8(tb[attrtype]);
	267	if (flag)
	268	p->flags \|= mask;
	269	else
	270	p->flags &= ~mask;
	271	}
	272	}
	273
	274	/* Process bridge protocol info on port */
	275	static int br_setport(struct net_bridge_port p, struct nlattr tb[])
	276	{
	277	int err;
	278
	279	br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
a2e01a65	280	br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
c2d3babf	281	br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
25c71c75	282
	283	if (tb[IFLA_BRPORT_COST]) {
	284	err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
	285	if (err)
	286	return err;
	287	}
	288
	289	if (tb[IFLA_BRPORT_PRIORITY]) {
	290	err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
	291	if (err)
	292	return err;
	293	}
	294
	295	if (tb[IFLA_BRPORT_STATE]) {
	296	err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
	297	if (err)
	298	return err;
	299	}
	300	return 0;
	301	}
	302
	303	/* Change state and parameters on port. */
e5a55a89	304	int br_setlink(struct net_device dev, struct nlmsghdr nlh)
11dc1f36	305	{
74685962 TG	306	struct ifinfomsg *ifm;
74685962 TG	307	struct nlattr *protinfo;
407af329	308	struct nlattr *afspec;
11dc1f36	309	struct net_bridge_port *p;
2062cc20	310	struct nlattr *tb[IFLA_BRPORT_MAX + 1];
25c71c75	311	int err;
11dc1f36	312
74685962	313	ifm = nlmsg_data(nlh);
11dc1f36	314
74685962	315	protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
407af329 VY	316	afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
407af329 VY	317	if (!protinfo && !afspec)
25c71c75	318	return 0;
11dc1f36	319
ec1e5610	320	p = br_port_get_rtnl(dev);
407af329 VY	321	/* We want to accept dev as bridge itself if the AF_SPEC
	322	* is set to see if someone is setting vlan info on the brigde
	323	*/
	324	if (!p && ((dev->priv_flags & IFF_EBRIDGE) && !afspec))
b5ed54e9	325	return -EINVAL;
11dc1f36	326
407af329 VY	327	if (p && protinfo) {
	328	if (protinfo->nla_type & NLA_F_NESTED) {
	329	err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
	330	protinfo, ifla_brport_policy);
	331	if (err)
	332	return err;
	333
	334	spin_lock_bh(&p->br->lock);
	335	err = br_setport(p, tb);
	336	spin_unlock_bh(&p->br->lock);
	337	} else {
	338	/* Binary compatability with old RSTP */
	339	if (nla_len(protinfo) < sizeof(u8))
	340	return -EINVAL;
	341
	342	spin_lock_bh(&p->br->lock);
	343	err = br_set_port_state(p, nla_get_u8(protinfo));
	344	spin_unlock_bh(&p->br->lock);
	345	}
25c71c75	346	if (err)
407af329 VY	347	goto out;
407af329 VY	348	}
11dc1f36	349
407af329 VY	350	if (afspec) {
	351	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
	352	afspec, RTM_SETLINK);
25c71c75	353	}
b03b6dd5	354
25c71c75	355	if (err == 0)
25c71c75	356	br_ifinfo_notify(RTM_NEWLINK, p);
b03b6dd5	357
407af329	358	out:
25c71c75	359	return err;
11dc1f36 SH	360	}
11dc1f36 SH	361
407af329 VY	362	/* Delete port information */
	363	int br_dellink(struct net_device dev, struct nlmsghdr nlh)
	364	{
	365	struct ifinfomsg *ifm;
	366	struct nlattr *afspec;
	367	struct net_bridge_port *p;
	368	int err;
	369
	370	ifm = nlmsg_data(nlh);
	371
	372	afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
	373	if (!afspec)
	374	return 0;
	375
	376	p = br_port_get_rtnl(dev);
	377	/* We want to accept dev as bridge itself as well */
	378	if (!p && !(dev->priv_flags & IFF_EBRIDGE))
	379	return -EINVAL;
	380
	381	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
	382	afspec, RTM_DELLINK);
	383
	384	return err;
	385	}
bb900b27	386	static int br_validate(struct nlattr tb[], struct nlattr data[])
	387	{
	388	if (tb[IFLA_ADDRESS]) {
	389	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	390	return -EINVAL;
	391	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	392	return -EADDRNOTAVAIL;
	393	}
	394
	395	return 0;
	396	}
	397
149ddd83	398	struct rtnl_link_ops br_link_ops __read_mostly = {
bb900b27	399	.kind = "bridge",
	400	.priv_size = sizeof(struct net_bridge),
	401	.setup = br_dev_setup,
	402	.validate = br_validate,
1ce5cce8	403	.dellink = br_dev_delete,
bb900b27	404	};
11dc1f36	405
32fe21c0	406	int __init br_netlink_init(void)
11dc1f36	407	{
3ec8e9f0 VY	408	int err;
	409
	410	br_mdb_init();
	411	err = rtnl_link_register(&br_link_ops);
	412	if (err)
	413	goto out;
	414
	415	return 0;
	416	out:
	417	br_mdb_uninit();
	418	return err;
11dc1f36 SH	419	}
	420
	421	void __exit br_netlink_fini(void)
	422	{
3ec8e9f0	423	br_mdb_uninit();
bb900b27	424	rtnl_link_unregister(&br_link_ops);
11dc1f36	425	}