[GitHub/mt8127/android_kernel_alcatel_ttab.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,
			  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, BR_VLAN_BITMAP_LEN))
			goto done;

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

		pvid = br_get_pvid(pv);
		for (vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
		     vid < BR_VLAN_BITMAP_LEN;
		     vid = find_next_bit(pv->vlan_bitmap,
					 BR_VLAN_BITMAP_LEN, vid+1)) {
			vinfo.vid = vid;
			vinfo.flags = 0;
			if (vid == pvid)
				vinfo.flags |= BRIDGE_VLAN_INFO_PVID;
			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:
	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, u32 filter_mask)
{
	int err = 0;
	struct net_bridge_port *port = br_port_get_rcu(dev);

	/* not a bridge port and  */
	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;
}

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, 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);

			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;
}

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_rcu(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));
}

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,
	.validate	= br_validate,
	.dellink	= br_dev_delete,
};

int __init br_netlink_init(void)
{
	int err;

	br_mdb_init();
	err = rtnl_af_register(&br_af_ops);
	if (err)
		goto out;

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

	return 0;

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

void __exit 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 */
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	*/
6cbdceeb VY	68	static int br_fill_ifinfo(struct sk_buff *skb,
	69	const struct net_bridge_port *port,
	70	u32 pid, u32 seq, int event, unsigned int flags,
	71	u32 filter_mask, const struct net_device *dev)
11dc1f36	72	{
6cbdceeb	73	const struct net_bridge *br;
74685962	74	struct ifinfomsg *hdr;
11dc1f36	75	struct nlmsghdr *nlh;
11dc1f36	76	u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
11dc1f36	77
6cbdceeb VY	78	if (port)
	79	br = port->br;
	80	else
	81	br = netdev_priv(dev);
	82
28a16c97	83	br_debug(br, "br_fill_info event %d port %s master %s\n",
28a16c97	84	event, dev->name, br->dev->name);
11dc1f36	85
74685962 TG	86	nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
74685962 TG	87	if (nlh == NULL)
26932566	88	return -EMSGSIZE;
11dc1f36	89
74685962 TG	90	hdr = nlmsg_data(nlh);
	91	hdr->ifi_family = AF_BRIDGE;
	92	hdr->__ifi_pad = 0;
	93	hdr->ifi_type = dev->type;
	94	hdr->ifi_index = dev->ifindex;
	95	hdr->ifi_flags = dev_get_flags(dev);
	96	hdr->ifi_change = 0;
11dc1f36	97
2eb812e6 DM	98	if (nla_put_string(skb, IFLA_IFNAME, dev->name) \|\|
	99	nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) \|\|
	100	nla_put_u32(skb, IFLA_MTU, dev->mtu) \|\|
	101	nla_put_u8(skb, IFLA_OPERSTATE, operstate) \|\|
	102	(dev->addr_len &&
	103	nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) \|\|
	104	(dev->ifindex != dev->iflink &&
25c71c75	105	nla_put_u32(skb, IFLA_LINK, dev->iflink)))
2eb812e6	106	goto nla_put_failure;
25c71c75	107
6cbdceeb	108	if (event == RTM_NEWLINK && port) {
25c71c75	109	struct nlattr *nest
	110	= nla_nest_start(skb, IFLA_PROTINFO \| NLA_F_NESTED);
	111
	112	if (nest == NULL \|\| br_port_fill_attrs(skb, port) < 0)
	113	goto nla_put_failure;
	114	nla_nest_end(skb, nest);
	115	}
	116
6cbdceeb VY	117	/* Check if the VID information is requested */
	118	if (filter_mask & RTEXT_FILTER_BRVLAN) {
	119	struct nlattr *af;
	120	const struct net_port_vlans *pv;
	121	struct bridge_vlan_info vinfo;
	122	u16 vid;
552406c4	123	u16 pvid;
6cbdceeb VY	124
	125	if (port)
	126	pv = nbp_get_vlan_info(port);
	127	else
	128	pv = br_get_vlan_info(br);
	129
	130	if (!pv \|\| bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN))
	131	goto done;
	132
	133	af = nla_nest_start(skb, IFLA_AF_SPEC);
	134	if (!af)
	135	goto nla_put_failure;
	136
552406c4	137	pvid = br_get_pvid(pv);
6cbdceeb VY	138	for (vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN);
	139	vid < BR_VLAN_BITMAP_LEN;
	140	vid = find_next_bit(pv->vlan_bitmap,
	141	BR_VLAN_BITMAP_LEN, vid+1)) {
	142	vinfo.vid = vid;
	143	vinfo.flags = 0;
552406c4 VY	144	if (vid == pvid)
552406c4 VY	145	vinfo.flags \|= BRIDGE_VLAN_INFO_PVID;
6cbdceeb VY	146	if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
	147	sizeof(vinfo), &vinfo))
	148	goto nla_put_failure;
	149	}
	150
	151	nla_nest_end(skb, af);
	152	}
	153
	154	done:
74685962	155	return nlmsg_end(skb, nlh);
11dc1f36	156
74685962	157	nla_put_failure:
26932566 PM	158	nlmsg_cancel(skb, nlh);
26932566 PM	159	return -EMSGSIZE;
11dc1f36 SH	160	}
	161
	162	/*
	163	* Notify listeners of a change in port information
	164	*/
	165	void br_ifinfo_notify(int event, struct net_bridge_port *port)
	166	{
407af329	167	struct net *net;
11dc1f36	168	struct sk_buff *skb;
280a306c	169	int err = -ENOBUFS;
11dc1f36	170
407af329 VY	171	if (!port)
	172	return;
	173
	174	net = dev_net(port->dev);
28a16c97	175	br_debug(port->br, "port %u(%s) event %d\n",
95c96174	176	(unsigned int)port->port_no, port->dev->name, event);
28a16c97	177
339bf98f	178	skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
280a306c TG	179	if (skb == NULL)
	180	goto errout;
	181
6cbdceeb	182	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
26932566 PM	183	if (err < 0) {
	184	/* -EMSGSIZE implies BUG in br_nlmsg_size() */
	185	WARN_ON(err == -EMSGSIZE);
	186	kfree_skb(skb);
	187	goto errout;
	188	}
1ce85fe4 PNA	189	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
1ce85fe4 PNA	190	return;
280a306c	191	errout:
bea1b42e	192	if (err < 0)
4aa678ba	193	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
11dc1f36 SH	194	}
11dc1f36 SH	195
407af329	196
11dc1f36 SH	197	/*
	198	* Dump information about all ports, in response to GETLINK
	199	*/
e5a55a89	200	int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
6cbdceeb	201	struct net_device *dev, u32 filter_mask)
11dc1f36	202	{
e5a55a89 JF	203	int err = 0;
	204	struct net_bridge_port *port = br_port_get_rcu(dev);
	205
6cbdceeb VY	206	/* not a bridge port and */
6cbdceeb VY	207	if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN))
e5a55a89	208	goto out;
11dc1f36	209
6cbdceeb VY	210	err = br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, NLM_F_MULTI,
6cbdceeb VY	211	filter_mask, dev);
e5a55a89 JF	212	out:
e5a55a89 JF	213	return err;
11dc1f36 SH	214	}
11dc1f36 SH	215
407af329 VY	216	const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
	217	[IFLA_BRIDGE_FLAGS] = { .type = NLA_U16 },
	218	[IFLA_BRIDGE_MODE] = { .type = NLA_U16 },
	219	[IFLA_BRIDGE_VLAN_INFO] = { .type = NLA_BINARY,
	220	.len = sizeof(struct bridge_vlan_info), },
	221	};
	222
	223	static int br_afspec(struct net_bridge *br,
	224	struct net_bridge_port *p,
	225	struct nlattr *af_spec,
	226	int cmd)
	227	{
	228	struct nlattr *tb[IFLA_BRIDGE_MAX+1];
	229	int err = 0;
	230
	231	err = nla_parse_nested(tb, IFLA_BRIDGE_MAX, af_spec, ifla_br_policy);
	232	if (err)
	233	return err;
	234
	235	if (tb[IFLA_BRIDGE_VLAN_INFO]) {
	236	struct bridge_vlan_info *vinfo;
	237
	238	vinfo = nla_data(tb[IFLA_BRIDGE_VLAN_INFO]);
	239
	240	if (vinfo->vid >= VLAN_N_VID)
	241	return -EINVAL;
	242
	243	switch (cmd) {
	244	case RTM_SETLINK:
	245	if (p) {
552406c4	246	err = nbp_vlan_add(p, vinfo->vid, vinfo->flags);
407af329 VY	247	if (err)
	248	break;
	249
	250	if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
552406c4 VY	251	err = br_vlan_add(p->br, vinfo->vid,
552406c4 VY	252	vinfo->flags);
407af329	253	} else
552406c4	254	err = br_vlan_add(br, vinfo->vid, vinfo->flags);
407af329 VY	255
	256	if (err)
	257	break;
	258
	259	break;
	260
	261	case RTM_DELLINK:
	262	if (p) {
	263	nbp_vlan_delete(p, vinfo->vid);
	264	if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
	265	br_vlan_delete(p->br, vinfo->vid);
	266	} else
	267	br_vlan_delete(br, vinfo->vid);
	268	break;
	269	}
	270	}
	271
	272	return err;
	273	}
	274
25c71c75	275	static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
	276	[IFLA_BRPORT_STATE] = { .type = NLA_U8 },
	277	[IFLA_BRPORT_COST] = { .type = NLA_U32 },
	278	[IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
	279	[IFLA_BRPORT_MODE] = { .type = NLA_U8 },
a2e01a65	280	[IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
1007dd1a	281	[IFLA_BRPORT_PROTECT] = { .type = NLA_U8 },
25c71c75	282	};
	283
	284	/* Change the state of the port and notify spanning tree */
	285	static int br_set_port_state(struct net_bridge_port *p, u8 state)
	286	{
	287	if (state > BR_STATE_BLOCKING)
	288	return -EINVAL;
	289
	290	/* if kernel STP is running, don't allow changes */
	291	if (p->br->stp_enabled == BR_KERNEL_STP)
	292	return -EBUSY;
	293
576eb625	294	/* if device is not up, change is not allowed
	295	* if link is not present, only allowable state is disabled
	296	*/
25c71c75	297	if (!netif_running(p->dev) \|\|
576eb625	298	(!netif_oper_up(p->dev) && state != BR_STATE_DISABLED))
25c71c75	299	return -ENETDOWN;
	300
	301	p->state = state;
	302	br_log_state(p);
	303	br_port_state_selection(p->br);
	304	return 0;
	305	}
	306
	307	/* Set/clear or port flags based on attribute */
	308	static void br_set_port_flag(struct net_bridge_port p, struct nlattr tb[],
	309	int attrtype, unsigned long mask)
	310	{
	311	if (tb[attrtype]) {
	312	u8 flag = nla_get_u8(tb[attrtype]);
	313	if (flag)
	314	p->flags \|= mask;
	315	else
	316	p->flags &= ~mask;
	317	}
	318	}
	319
	320	/* Process bridge protocol info on port */
	321	static int br_setport(struct net_bridge_port p, struct nlattr tb[])
	322	{
	323	int err;
	324
	325	br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
a2e01a65	326	br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
c2d3babf	327	br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
25c71c75	328
	329	if (tb[IFLA_BRPORT_COST]) {
	330	err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
	331	if (err)
	332	return err;
	333	}
	334
	335	if (tb[IFLA_BRPORT_PRIORITY]) {
	336	err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
	337	if (err)
	338	return err;
	339	}
	340
	341	if (tb[IFLA_BRPORT_STATE]) {
	342	err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
	343	if (err)
	344	return err;
	345	}
	346	return 0;
	347	}
	348
	349	/* Change state and parameters on port. */
e5a55a89	350	int br_setlink(struct net_device dev, struct nlmsghdr nlh)
11dc1f36	351	{
74685962 TG	352	struct ifinfomsg *ifm;
74685962 TG	353	struct nlattr *protinfo;
407af329	354	struct nlattr *afspec;
11dc1f36	355	struct net_bridge_port *p;
2062cc20	356	struct nlattr *tb[IFLA_BRPORT_MAX + 1];
25c71c75	357	int err;
11dc1f36	358
74685962	359	ifm = nlmsg_data(nlh);
11dc1f36	360
74685962	361	protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
407af329 VY	362	afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
407af329 VY	363	if (!protinfo && !afspec)
25c71c75	364	return 0;
11dc1f36	365
ec1e5610	366	p = br_port_get_rtnl(dev);
407af329 VY	367	/* We want to accept dev as bridge itself if the AF_SPEC
	368	* is set to see if someone is setting vlan info on the brigde
	369	*/
	370	if (!p && ((dev->priv_flags & IFF_EBRIDGE) && !afspec))
b5ed54e9	371	return -EINVAL;
11dc1f36	372
407af329 VY	373	if (p && protinfo) {
	374	if (protinfo->nla_type & NLA_F_NESTED) {
	375	err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
	376	protinfo, ifla_brport_policy);
	377	if (err)
	378	return err;
	379
	380	spin_lock_bh(&p->br->lock);
	381	err = br_setport(p, tb);
	382	spin_unlock_bh(&p->br->lock);
	383	} else {
	384	/* Binary compatability with old RSTP */
	385	if (nla_len(protinfo) < sizeof(u8))
	386	return -EINVAL;
	387
	388	spin_lock_bh(&p->br->lock);
	389	err = br_set_port_state(p, nla_get_u8(protinfo));
	390	spin_unlock_bh(&p->br->lock);
	391	}
25c71c75	392	if (err)
407af329 VY	393	goto out;
407af329 VY	394	}
11dc1f36	395
407af329 VY	396	if (afspec) {
	397	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
	398	afspec, RTM_SETLINK);
25c71c75	399	}
b03b6dd5	400
25c71c75	401	if (err == 0)
25c71c75	402	br_ifinfo_notify(RTM_NEWLINK, p);
b03b6dd5	403
407af329	404	out:
25c71c75	405	return err;
11dc1f36 SH	406	}
11dc1f36 SH	407
407af329 VY	408	/* Delete port information */
	409	int br_dellink(struct net_device dev, struct nlmsghdr nlh)
	410	{
	411	struct ifinfomsg *ifm;
	412	struct nlattr *afspec;
	413	struct net_bridge_port *p;
	414	int err;
	415
	416	ifm = nlmsg_data(nlh);
	417
	418	afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
	419	if (!afspec)
	420	return 0;
	421
	422	p = br_port_get_rtnl(dev);
	423	/* We want to accept dev as bridge itself as well */
	424	if (!p && !(dev->priv_flags & IFF_EBRIDGE))
	425	return -EINVAL;
	426
	427	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
	428	afspec, RTM_DELLINK);
	429
	430	return err;
	431	}
bb900b27	432	static int br_validate(struct nlattr tb[], struct nlattr data[])
	433	{
	434	if (tb[IFLA_ADDRESS]) {
	435	if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
	436	return -EINVAL;
	437	if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
	438	return -EADDRNOTAVAIL;
	439	}
	440
	441	return 0;
	442	}
	443
6cbdceeb VY	444	static size_t br_get_link_af_size(const struct net_device *dev)
	445	{
	446	struct net_port_vlans *pv;
	447
	448	if (br_port_exists(dev))
	449	pv = nbp_get_vlan_info(br_port_get_rcu(dev));
	450	else if (dev->priv_flags & IFF_EBRIDGE)
	451	pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
	452	else
	453	return 0;
	454
	455	if (!pv)
	456	return 0;
	457
	458	/* Each VLAN is returned in bridge_vlan_info along with flags */
	459	return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
	460	}
	461
	462	struct rtnl_af_ops br_af_ops = {
	463	.family = AF_BRIDGE,
	464	.get_link_af_size = br_get_link_af_size,
	465	};
	466
149ddd83	467	struct rtnl_link_ops br_link_ops __read_mostly = {
bb900b27	468	.kind = "bridge",
	469	.priv_size = sizeof(struct net_bridge),
	470	.setup = br_dev_setup,
	471	.validate = br_validate,
1ce5cce8	472	.dellink = br_dev_delete,
bb900b27	473	};
11dc1f36	474
32fe21c0	475	int __init br_netlink_init(void)
11dc1f36	476	{
3ec8e9f0 VY	477	int err;
	478
	479	br_mdb_init();
6cbdceeb	480	err = rtnl_af_register(&br_af_ops);
3ec8e9f0 VY	481	if (err)
	482	goto out;
	483
6cbdceeb VY	484	err = rtnl_link_register(&br_link_ops);
	485	if (err)
	486	goto out_af;
	487
3ec8e9f0	488	return 0;
6cbdceeb VY	489
	490	out_af:
	491	rtnl_af_unregister(&br_af_ops);
3ec8e9f0 VY	492	out:
	493	br_mdb_uninit();
	494	return err;
11dc1f36 SH	495	}
	496
	497	void __exit br_netlink_fini(void)
	498	{
3ec8e9f0	499	br_mdb_uninit();
6cbdceeb	500	rtnl_af_unregister(&br_af_ops);
bb900b27	501	rtnl_link_unregister(&br_link_ops);
11dc1f36	502	}