[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 (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:
	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;
35e03f3a VY	146
	147	if (test_bit(vid, pv->untagged_bitmap))
	148	vinfo.flags \|= BRIDGE_VLAN_INFO_UNTAGGED;
	149
6cbdceeb VY	150	if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO,
	151	sizeof(vinfo), &vinfo))
	152	goto nla_put_failure;
	153	}
	154
	155	nla_nest_end(skb, af);
	156	}
	157
	158	done:
74685962	159	return nlmsg_end(skb, nlh);
11dc1f36	160
74685962	161	nla_put_failure:
26932566 PM	162	nlmsg_cancel(skb, nlh);
26932566 PM	163	return -EMSGSIZE;
11dc1f36 SH	164	}
	165
	166	/*
	167	* Notify listeners of a change in port information
	168	*/
	169	void br_ifinfo_notify(int event, struct net_bridge_port *port)
	170	{
407af329	171	struct net *net;
11dc1f36	172	struct sk_buff *skb;
280a306c	173	int err = -ENOBUFS;
11dc1f36	174
407af329 VY	175	if (!port)
	176	return;
	177
	178	net = dev_net(port->dev);
28a16c97	179	br_debug(port->br, "port %u(%s) event %d\n",
95c96174	180	(unsigned int)port->port_no, port->dev->name, event);
28a16c97	181
339bf98f	182	skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC);
280a306c TG	183	if (skb == NULL)
	184	goto errout;
	185
6cbdceeb	186	err = br_fill_ifinfo(skb, port, 0, 0, event, 0, 0, port->dev);
26932566 PM	187	if (err < 0) {
	188	/* -EMSGSIZE implies BUG in br_nlmsg_size() */
	189	WARN_ON(err == -EMSGSIZE);
	190	kfree_skb(skb);
	191	goto errout;
	192	}
1ce85fe4 PNA	193	rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC);
1ce85fe4 PNA	194	return;
280a306c	195	errout:
bea1b42e	196	if (err < 0)
4aa678ba	197	rtnl_set_sk_err(net, RTNLGRP_LINK, err);
11dc1f36 SH	198	}
11dc1f36 SH	199
407af329	200
11dc1f36 SH	201	/*
	202	* Dump information about all ports, in response to GETLINK
	203	*/
e5a55a89	204	int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
6cbdceeb	205	struct net_device *dev, u32 filter_mask)
11dc1f36	206	{
e5a55a89 JF	207	int err = 0;
	208	struct net_bridge_port *port = br_port_get_rcu(dev);
	209
6cbdceeb VY	210	/* not a bridge port and */
6cbdceeb VY	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
407af329 VY	220	const struct nla_policy ifla_br_policy[IFLA_MAX+1] = {
	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
	244	if (vinfo->vid >= VLAN_N_VID)
	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 VY	259
	260	if (err)
	261	break;
	262
	263	break;
	264
	265	case RTM_DELLINK:
	266	if (p) {
	267	nbp_vlan_delete(p, vinfo->vid);
	268	if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER)
	269	br_vlan_delete(p->br, vinfo->vid);
	270	} else
	271	br_vlan_delete(br, vinfo->vid);
	272	break;
	273	}
	274	}
	275
	276	return err;
	277	}
	278
25c71c75	279	static const struct nla_policy ifla_brport_policy[IFLA_BRPORT_MAX + 1] = {
	280	[IFLA_BRPORT_STATE] = { .type = NLA_U8 },
	281	[IFLA_BRPORT_COST] = { .type = NLA_U32 },
	282	[IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 },
	283	[IFLA_BRPORT_MODE] = { .type = NLA_U8 },
a2e01a65	284	[IFLA_BRPORT_GUARD] = { .type = NLA_U8 },
1007dd1a	285	[IFLA_BRPORT_PROTECT] = { .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;
	304
	305	p->state = state;
	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;
	328
	329	br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE);
a2e01a65	330	br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD);
c2d3babf	331	br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE);
25c71c75	332
	333	if (tb[IFLA_BRPORT_COST]) {
	334	err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST]));
	335	if (err)
	336	return err;
	337	}
	338
	339	if (tb[IFLA_BRPORT_PRIORITY]) {
	340	err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY]));
	341	if (err)
	342	return err;
	343	}
	344
	345	if (tb[IFLA_BRPORT_STATE]) {
	346	err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE]));
	347	if (err)
	348	return err;
	349	}
	350	return 0;
	351	}
	352
	353	/* Change state and parameters on port. */
e5a55a89	354	int br_setlink(struct net_device dev, struct nlmsghdr nlh)
11dc1f36	355	{
74685962 TG	356	struct ifinfomsg *ifm;
74685962 TG	357	struct nlattr *protinfo;
407af329	358	struct nlattr *afspec;
11dc1f36	359	struct net_bridge_port *p;
2062cc20	360	struct nlattr *tb[IFLA_BRPORT_MAX + 1];
25c71c75	361	int err;
11dc1f36	362
74685962	363	ifm = nlmsg_data(nlh);
11dc1f36	364
74685962	365	protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO);
407af329 VY	366	afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
407af329 VY	367	if (!protinfo && !afspec)
25c71c75	368	return 0;
11dc1f36	369
ec1e5610	370	p = br_port_get_rtnl(dev);
407af329 VY	371	/* We want to accept dev as bridge itself if the AF_SPEC
	372	* is set to see if someone is setting vlan info on the brigde
	373	*/
	374	if (!p && ((dev->priv_flags & IFF_EBRIDGE) && !afspec))
b5ed54e9	375	return -EINVAL;
11dc1f36	376
407af329 VY	377	if (p && protinfo) {
	378	if (protinfo->nla_type & NLA_F_NESTED) {
	379	err = nla_parse_nested(tb, IFLA_BRPORT_MAX,
	380	protinfo, ifla_brport_policy);
	381	if (err)
	382	return err;
	383
	384	spin_lock_bh(&p->br->lock);
	385	err = br_setport(p, tb);
	386	spin_unlock_bh(&p->br->lock);
	387	} else {
	388	/* Binary compatability with old RSTP */
	389	if (nla_len(protinfo) < sizeof(u8))
	390	return -EINVAL;
	391
	392	spin_lock_bh(&p->br->lock);
	393	err = br_set_port_state(p, nla_get_u8(protinfo));
	394	spin_unlock_bh(&p->br->lock);
	395	}
25c71c75	396	if (err)
407af329 VY	397	goto out;
407af329 VY	398	}
11dc1f36	399
407af329 VY	400	if (afspec) {
	401	err = br_afspec((struct net_bridge *)netdev_priv(dev), p,
	402	afspec, RTM_SETLINK);
25c71c75	403	}
b03b6dd5	404
25c71c75	405	if (err == 0)
25c71c75	406	br_ifinfo_notify(RTM_NEWLINK, p);
b03b6dd5	407
407af329	408	out:
25c71c75	409	return err;
11dc1f36 SH	410	}
11dc1f36 SH	411
407af329 VY	412	/* Delete port information */
	413	int br_dellink(struct net_device dev, struct nlmsghdr nlh)
	414	{
	415	struct ifinfomsg *ifm;
	416	struct nlattr *afspec;
	417	struct net_bridge_port *p;
	418	int err;
	419
	420	ifm = nlmsg_data(nlh);
	421
	422	afspec = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_AF_SPEC);
	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
6cbdceeb VY	448	static size_t br_get_link_af_size(const struct net_device *dev)
	449	{
	450	struct net_port_vlans *pv;
	451
	452	if (br_port_exists(dev))
	453	pv = nbp_get_vlan_info(br_port_get_rcu(dev));
	454	else if (dev->priv_flags & IFF_EBRIDGE)
	455	pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev));
	456	else
	457	return 0;
	458
	459	if (!pv)
	460	return 0;
	461
	462	/* Each VLAN is returned in bridge_vlan_info along with flags */
	463	return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info));
	464	}
	465
	466	struct rtnl_af_ops br_af_ops = {
	467	.family = AF_BRIDGE,
	468	.get_link_af_size = br_get_link_af_size,
	469	};
	470
149ddd83	471	struct rtnl_link_ops br_link_ops __read_mostly = {
bb900b27	472	.kind = "bridge",
	473	.priv_size = sizeof(struct net_bridge),
	474	.setup = br_dev_setup,
	475	.validate = br_validate,
1ce5cce8	476	.dellink = br_dev_delete,
bb900b27	477	};
11dc1f36	478
32fe21c0	479	int __init br_netlink_init(void)
11dc1f36	480	{
3ec8e9f0 VY	481	int err;
	482
	483	br_mdb_init();
6cbdceeb	484	err = rtnl_af_register(&br_af_ops);
3ec8e9f0 VY	485	if (err)
	486	goto out;
	487
6cbdceeb VY	488	err = rtnl_link_register(&br_link_ops);
	489	if (err)
	490	goto out_af;
	491
3ec8e9f0	492	return 0;
6cbdceeb VY	493
	494	out_af:
	495	rtnl_af_unregister(&br_af_ops);
3ec8e9f0 VY	496	out:
	497	br_mdb_uninit();
	498	return err;
11dc1f36 SH	499	}
	500
	501	void __exit br_netlink_fini(void)
	502	{
3ec8e9f0	503	br_mdb_uninit();
6cbdceeb	504	rtnl_af_unregister(&br_af_ops);
bb900b27	505	rtnl_link_unregister(&br_link_ops);
11dc1f36	506	}