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

/*
 *	Spanning tree protocol; interface code
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.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/kmod.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <net/switchdev.h>

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


/* Port id is composed of priority and port number.
 * NB: some bits of priority are dropped to
 *     make room for more ports.
 */
static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
{
	return ((u16)priority << BR_PORT_BITS)
		| (port_no & ((1<<BR_PORT_BITS)-1));
}

#define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS)

/* called under bridge lock */
void br_init_port(struct net_bridge_port *p)
{
	struct switchdev_attr attr = {
		.orig_dev = p->dev,
		.id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
		.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP | SWITCHDEV_F_DEFER,
		.u.ageing_time = jiffies_to_clock_t(p->br->ageing_time),
	};
	int err;

	p->port_id = br_make_port_id(p->priority, p->port_no);
	br_become_designated_port(p);
	br_set_state(p, BR_STATE_BLOCKING);
	p->topology_change_ack = 0;
	p->config_pending = 0;

	err = switchdev_port_attr_set(p->dev, &attr);
	if (err && err != -EOPNOTSUPP)
		netdev_err(p->dev, "failed to set HW ageing time\n");
}

/* called under bridge lock */
void br_stp_enable_bridge(struct net_bridge *br)
{
	struct net_bridge_port *p;

	spin_lock_bh(&br->lock);
	if (br->stp_enabled == BR_KERNEL_STP)
		mod_timer(&br->hello_timer, jiffies + br->hello_time);
	mod_timer(&br->gc_timer, jiffies + HZ/10);

	br_config_bpdu_generation(br);

	list_for_each_entry(p, &br->port_list, list) {
		if (netif_running(p->dev) && netif_oper_up(p->dev))
			br_stp_enable_port(p);

	}
	spin_unlock_bh(&br->lock);
}

/* NO locks held */
void br_stp_disable_bridge(struct net_bridge *br)
{
	struct net_bridge_port *p;

	spin_lock_bh(&br->lock);
	list_for_each_entry(p, &br->port_list, list) {
		if (p->state != BR_STATE_DISABLED)
			br_stp_disable_port(p);

	}

	br->topology_change = 0;
	br->topology_change_detected = 0;
	spin_unlock_bh(&br->lock);

	del_timer_sync(&br->hello_timer);
	del_timer_sync(&br->topology_change_timer);
	del_timer_sync(&br->tcn_timer);
	del_timer_sync(&br->gc_timer);
}

/* called under bridge lock */
void br_stp_enable_port(struct net_bridge_port *p)
{
	br_init_port(p);
	br_port_state_selection(p->br);
	br_log_state(p);
	br_ifinfo_notify(RTM_NEWLINK, p);
}

/* called under bridge lock */
void br_stp_disable_port(struct net_bridge_port *p)
{
	struct net_bridge *br = p->br;
	int wasroot;

	wasroot = br_is_root_bridge(br);
	br_become_designated_port(p);
	br_set_state(p, BR_STATE_DISABLED);
	p->topology_change_ack = 0;
	p->config_pending = 0;

	br_log_state(p);
	br_ifinfo_notify(RTM_NEWLINK, p);

	del_timer(&p->message_age_timer);
	del_timer(&p->forward_delay_timer);
	del_timer(&p->hold_timer);

	br_fdb_delete_by_port(br, p, 0, 0);
	br_multicast_disable_port(p);

	br_configuration_update(br);

	br_port_state_selection(br);

	if (br_is_root_bridge(br) && !wasroot)
		br_become_root_bridge(br);
}

static void br_stp_start(struct net_bridge *br)
{
	int r;
	char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL };
	char *envp[] = { NULL };
	struct net_bridge_port *p;

	if (net_eq(dev_net(br->dev), &init_net))
		r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
	else
		r = -ENOENT;

	spin_lock_bh(&br->lock);

	if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY)
		__br_set_forward_delay(br, BR_MIN_FORWARD_DELAY);
	else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY)
		__br_set_forward_delay(br, BR_MAX_FORWARD_DELAY);

	if (r == 0) {
		br->stp_enabled = BR_USER_STP;
		br_debug(br, "userspace STP started\n");
		/* Stop hello and hold timers */
		del_timer(&br->hello_timer);
		list_for_each_entry(p, &br->port_list, list)
			del_timer(&p->hold_timer);
	} else {
		br->stp_enabled = BR_KERNEL_STP;
		br_debug(br, "using kernel STP\n");

		/* To start timers on any ports left in blocking */
		br_port_state_selection(br);
	}

	spin_unlock_bh(&br->lock);
}

static void br_stp_stop(struct net_bridge *br)
{
	int r;
	char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL };
	char *envp[] = { NULL };
	struct net_bridge_port *p;

	if (br->stp_enabled == BR_USER_STP) {
		r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
		br_info(br, "userspace STP stopped, return code %d\n", r);

		/* To start timers on any ports left in blocking */
		mod_timer(&br->hello_timer, jiffies + br->hello_time);
		list_for_each_entry(p, &br->port_list, list)
			mod_timer(&p->hold_timer,
				  round_jiffies(jiffies + BR_HOLD_TIME));
		spin_lock_bh(&br->lock);
		br_port_state_selection(br);
		spin_unlock_bh(&br->lock);
	}

	br->stp_enabled = BR_NO_STP;
}

void br_stp_set_enabled(struct net_bridge *br, unsigned long val)
{
	ASSERT_RTNL();

	if (val) {
		if (br->stp_enabled == BR_NO_STP)
			br_stp_start(br);
	} else {
		if (br->stp_enabled != BR_NO_STP)
			br_stp_stop(br);
	}
}

/* called under bridge lock */
void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr)
{
	/* should be aligned on 2 bytes for ether_addr_equal() */
	unsigned short oldaddr_aligned[ETH_ALEN >> 1];
	unsigned char *oldaddr = (unsigned char *)oldaddr_aligned;
	struct net_bridge_port *p;
	int wasroot;

	wasroot = br_is_root_bridge(br);

	br_fdb_change_mac_address(br, addr);

	memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
	memcpy(br->bridge_id.addr, addr, ETH_ALEN);
	memcpy(br->dev->dev_addr, addr, ETH_ALEN);

	list_for_each_entry(p, &br->port_list, list) {
		if (ether_addr_equal(p->designated_bridge.addr, oldaddr))
			memcpy(p->designated_bridge.addr, addr, ETH_ALEN);

		if (ether_addr_equal(p->designated_root.addr, oldaddr))
			memcpy(p->designated_root.addr, addr, ETH_ALEN);
	}

	br_configuration_update(br);
	br_port_state_selection(br);
	if (br_is_root_bridge(br) && !wasroot)
		br_become_root_bridge(br);
}

/* should be aligned on 2 bytes for ether_addr_equal() */
static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1];

/* called under bridge lock */
bool br_stp_recalculate_bridge_id(struct net_bridge *br)
{
	const unsigned char *br_mac_zero =
			(const unsigned char *)br_mac_zero_aligned;
	const unsigned char *addr = br_mac_zero;
	struct net_bridge_port *p;

	/* user has chosen a value so keep it */
	if (br->dev->addr_assign_type == NET_ADDR_SET)
		return false;

	list_for_each_entry(p, &br->port_list, list) {
		if (addr == br_mac_zero ||
		    memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
			addr = p->dev->dev_addr;

	}

	if (ether_addr_equal(br->bridge_id.addr, addr))
		return false;	/* no change */

	br_stp_change_bridge_id(br, addr);
	return true;
}

/* Acquires and releases bridge lock */
void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
{
	struct net_bridge_port *p;
	int wasroot;

	spin_lock_bh(&br->lock);
	wasroot = br_is_root_bridge(br);

	list_for_each_entry(p, &br->port_list, list) {
		if (p->state != BR_STATE_DISABLED &&
		    br_is_designated_port(p)) {
			p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;
			p->designated_bridge.prio[1] = newprio & 0xFF;
		}

	}

	br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;
	br->bridge_id.prio[1] = newprio & 0xFF;
	br_configuration_update(br);
	br_port_state_selection(br);
	if (br_is_root_bridge(br) && !wasroot)
		br_become_root_bridge(br);
	spin_unlock_bh(&br->lock);
}

/* called under bridge lock */
int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio)
{
	port_id new_port_id;

	if (newprio > BR_MAX_PORT_PRIORITY)
		return -ERANGE;

	new_port_id = br_make_port_id(newprio, p->port_no);
	if (br_is_designated_port(p))
		p->designated_port = new_port_id;

	p->port_id = new_port_id;
	p->priority = newprio;
	if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&
	    p->port_id < p->designated_port) {
		br_become_designated_port(p);
		br_port_state_selection(p->br);
	}

	return 0;
}

/* called under bridge lock */
int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost)
{
	if (path_cost < BR_MIN_PATH_COST ||
	    path_cost > BR_MAX_PATH_COST)
		return -ERANGE;

	p->flags |= BR_ADMIN_COST;
	p->path_cost = path_cost;
	br_configuration_update(p->br);
	br_port_state_selection(p->br);
	return 0;
}

ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id)
{
	return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
	       id->prio[0], id->prio[1],
	       id->addr[0], id->addr[1], id->addr[2],
	       id->addr[3], id->addr[4], id->addr[5]);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Spanning tree protocol; interface code
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Lennert Buytenhek <buytenh@gnu.org>
	7	*
1da177e4 LT	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
	14	#include <linux/kernel.h>
79bb1ee4	15	#include <linux/kmod.h>
6ede2463	16	#include <linux/etherdevice.h>
11dc1f36	17	#include <linux/rtnetlink.h>
6ac311ae	18	#include <net/switchdev.h>
1da177e4 LT	19
	20	#include "br_private.h"
	21	#include "br_private_stp.h"
	22
	23
	24	/* Port id is composed of priority and port number.
14f98f25	25	* NB: some bits of priority are dropped to
1da177e4 LT	26	* make room for more ports.
	27	*/
	28	static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
	29	{
9d6f229f	30	return ((u16)priority << BR_PORT_BITS)
1da177e4 LT	31	\| (port_no & ((1<<BR_PORT_BITS)-1));
	32	}
	33
14f98f25	34	#define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS)
14f98f25	35
1da177e4 LT	36	/* called under bridge lock */
	37	void br_init_port(struct net_bridge_port *p)
	38	{
6ac311ae	39	struct switchdev_attr attr = {
6ff64f6f	40	.orig_dev = p->dev,
6ac311ae ER	41	.id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
6ac311ae ER	42	.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP \| SWITCHDEV_F_DEFER,
ef9cdd0f	43	.u.ageing_time = jiffies_to_clock_t(p->br->ageing_time),
6ac311ae ER	44	};
	45	int err;
	46
1da177e4 LT	47	p->port_id = br_make_port_id(p->priority, p->port_no);
1da177e4 LT	48	br_become_designated_port(p);
775dd692	49	br_set_state(p, BR_STATE_BLOCKING);
1da177e4 LT	50	p->topology_change_ack = 0;
1da177e4 LT	51	p->config_pending = 0;
6ac311ae ER	52
6ac311ae ER	53	err = switchdev_port_attr_set(p->dev, &attr);
bbe14f54	54	if (err && err != -EOPNOTSUPP)
6ac311ae	55	netdev_err(p->dev, "failed to set HW ageing time\n");
1da177e4 LT	56	}
	57
	58	/* called under bridge lock */
	59	void br_stp_enable_bridge(struct net_bridge *br)
	60	{
	61	struct net_bridge_port *p;
	62
	63	spin_lock_bh(&br->lock);
76b91c32 NA	64	if (br->stp_enabled == BR_KERNEL_STP)
76b91c32 NA	65	mod_timer(&br->hello_timer, jiffies + br->hello_time);
1da177e4	66	mod_timer(&br->gc_timer, jiffies + HZ/10);
9d6f229f	67
1da177e4 LT	68	br_config_bpdu_generation(br);
	69
	70	list_for_each_entry(p, &br->port_list, list) {
576eb625	71	if (netif_running(p->dev) && netif_oper_up(p->dev))
1da177e4 LT	72	br_stp_enable_port(p);
	73
	74	}
	75	spin_unlock_bh(&br->lock);
	76	}
	77
	78	/* NO locks held */
	79	void br_stp_disable_bridge(struct net_bridge *br)
	80	{
	81	struct net_bridge_port *p;
	82
78872ccb	83	spin_lock_bh(&br->lock);
1da177e4 LT	84	list_for_each_entry(p, &br->port_list, list) {
	85	if (p->state != BR_STATE_DISABLED)
	86	br_stp_disable_port(p);
	87
	88	}
	89
	90	br->topology_change = 0;
	91	br->topology_change_detected = 0;
78872ccb	92	spin_unlock_bh(&br->lock);
1da177e4 LT	93
	94	del_timer_sync(&br->hello_timer);
	95	del_timer_sync(&br->topology_change_timer);
	96	del_timer_sync(&br->tcn_timer);
	97	del_timer_sync(&br->gc_timer);
	98	}
	99
	100	/* called under bridge lock */
	101	void br_stp_enable_port(struct net_bridge_port *p)
	102	{
	103	br_init_port(p);
	104	br_port_state_selection(p->br);
28a16c97	105	br_log_state(p);
4ecb961c	106	br_ifinfo_notify(RTM_NEWLINK, p);
1da177e4 LT	107	}
	108
	109	/* called under bridge lock */
	110	void br_stp_disable_port(struct net_bridge_port *p)
	111	{
28a16c97	112	struct net_bridge *br = p->br;
1da177e4 LT	113	int wasroot;
1da177e4 LT	114
1da177e4 LT	115	wasroot = br_is_root_bridge(br);
1da177e4 LT	116	br_become_designated_port(p);
775dd692	117	br_set_state(p, BR_STATE_DISABLED);
1da177e4 LT	118	p->topology_change_ack = 0;
	119	p->config_pending = 0;
	120
5200959b	121	br_log_state(p);
4ecb961c	122	br_ifinfo_notify(RTM_NEWLINK, p);
4ecb961c	123
1da177e4 LT	124	del_timer(&p->message_age_timer);
	125	del_timer(&p->forward_delay_timer);
	126	del_timer(&p->hold_timer);
	127
1ea2d020	128	br_fdb_delete_by_port(br, p, 0, 0);
3fe2d7c7	129	br_multicast_disable_port(p);
1a620698	130
1da177e4 LT	131	br_configuration_update(br);
	132
	133	br_port_state_selection(br);
	134
	135	if (br_is_root_bridge(br) && !wasroot)
	136	br_become_root_bridge(br);
	137	}
	138
9cde0708 SH	139	static void br_stp_start(struct net_bridge *br)
	140	{
	141	int r;
	142	char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL };
	143	char *envp[] = { NULL };
76b91c32	144	struct net_bridge_port *p;
9cde0708	145
ff621985 HFS	146	if (net_eq(dev_net(br->dev), &init_net))
	147	r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
	148	else
	149	r = -ENOENT;
be4f154d HX	150
	151	spin_lock_bh(&br->lock);
	152
	153	if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY)
	154	__br_set_forward_delay(br, BR_MIN_FORWARD_DELAY);
4b6c7879	155	else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY)
be4f154d HX	156	__br_set_forward_delay(br, BR_MAX_FORWARD_DELAY);
be4f154d HX	157
9cde0708 SH	158	if (r == 0) {
9cde0708 SH	159	br->stp_enabled = BR_USER_STP;
28a16c97	160	br_debug(br, "userspace STP started\n");
76b91c32 NA	161	/* Stop hello and hold timers */
	162	del_timer(&br->hello_timer);
	163	list_for_each_entry(p, &br->port_list, list)
	164	del_timer(&p->hold_timer);
9cde0708 SH	165	} else {
9cde0708 SH	166	br->stp_enabled = BR_KERNEL_STP;
28a16c97	167	br_debug(br, "using kernel STP\n");
9cde0708 SH	168
9cde0708 SH	169	/* To start timers on any ports left in blocking */
9cde0708	170	br_port_state_selection(br);
9cde0708	171	}
be4f154d HX	172
be4f154d HX	173	spin_unlock_bh(&br->lock);
9cde0708 SH	174	}
	175
	176	static void br_stp_stop(struct net_bridge *br)
	177	{
	178	int r;
	179	char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL };
	180	char *envp[] = { NULL };
76b91c32	181	struct net_bridge_port *p;
9cde0708 SH	182
9cde0708 SH	183	if (br->stp_enabled == BR_USER_STP) {
1a9180a2	184	r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
28a16c97	185	br_info(br, "userspace STP stopped, return code %d\n", r);
9cde0708 SH	186
9cde0708 SH	187	/* To start timers on any ports left in blocking */
76b91c32 NA	188	mod_timer(&br->hello_timer, jiffies + br->hello_time);
	189	list_for_each_entry(p, &br->port_list, list)
	190	mod_timer(&p->hold_timer,
	191	round_jiffies(jiffies + BR_HOLD_TIME));
9cde0708 SH	192	spin_lock_bh(&br->lock);
	193	br_port_state_selection(br);
	194	spin_unlock_bh(&br->lock);
	195	}
	196
	197	br->stp_enabled = BR_NO_STP;
	198	}
	199
	200	void br_stp_set_enabled(struct net_bridge *br, unsigned long val)
	201	{
	202	ASSERT_RTNL();
	203
	204	if (val) {
	205	if (br->stp_enabled == BR_NO_STP)
	206	br_stp_start(br);
	207	} else {
	208	if (br->stp_enabled != BR_NO_STP)
	209	br_stp_stop(br);
	210	}
	211	}
	212
1da177e4	213	/* called under bridge lock */
4505a3ef	214	void br_stp_change_bridge_id(struct net_bridge br, const unsigned char addr)
1da177e4	215	{
9a7b6ef9	216	/* should be aligned on 2 bytes for ether_addr_equal() */
19bb3506 EK	217	unsigned short oldaddr_aligned[ETH_ALEN >> 1];
19bb3506 EK	218	unsigned char oldaddr = (unsigned char )oldaddr_aligned;
1da177e4 LT	219	struct net_bridge_port *p;
	220	int wasroot;
	221
	222	wasroot = br_is_root_bridge(br);
	223
a4b816d8 TM	224	br_fdb_change_mac_address(br, addr);
a4b816d8 TM	225
1da177e4 LT	226	memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
	227	memcpy(br->bridge_id.addr, addr, ETH_ALEN);
	228	memcpy(br->dev->dev_addr, addr, ETH_ALEN);
	229
	230	list_for_each_entry(p, &br->port_list, list) {
9a7b6ef9	231	if (ether_addr_equal(p->designated_bridge.addr, oldaddr))
1da177e4 LT	232	memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
1da177e4 LT	233
9a7b6ef9	234	if (ether_addr_equal(p->designated_root.addr, oldaddr))
1da177e4	235	memcpy(p->designated_root.addr, addr, ETH_ALEN);
1da177e4 LT	236	}
	237
	238	br_configuration_update(br);
	239	br_port_state_selection(br);
	240	if (br_is_root_bridge(br) && !wasroot)
	241	br_become_root_bridge(br);
	242	}
	243
9a7b6ef9	244	/* should be aligned on 2 bytes for ether_addr_equal() */
19bb3506	245	static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1];
1da177e4 LT	246
1da177e4 LT	247	/* called under bridge lock */
edf947f1	248	bool br_stp_recalculate_bridge_id(struct net_bridge *br)
1da177e4	249	{
19bb3506 EK	250	const unsigned char *br_mac_zero =
19bb3506 EK	251	(const unsigned char *)br_mac_zero_aligned;
1da177e4 LT	252	const unsigned char *addr = br_mac_zero;
	253	struct net_bridge_port *p;
	254
92c0574f	255	/* user has chosen a value so keep it */
b2748267	256	if (br->dev->addr_assign_type == NET_ADDR_SET)
1459a3cc	257	return false;
92c0574f	258
1da177e4 LT	259	list_for_each_entry(p, &br->port_list, list) {
1da177e4 LT	260	if (addr == br_mac_zero \|\|
554c9a8e	261	memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
1da177e4 LT	262	addr = p->dev->dev_addr;
	263
	264	}
	265
9a7b6ef9	266	if (ether_addr_equal(br->bridge_id.addr, addr))
edf947f1	267	return false; /* no change */
	268
	269	br_stp_change_bridge_id(br, addr);
	270	return true;
1da177e4 LT	271	}
1da177e4 LT	272
2dab80a8	273	/* Acquires and releases bridge lock */
1da177e4 LT	274	void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
	275	{
	276	struct net_bridge_port *p;
	277	int wasroot;
	278
2dab80a8	279	spin_lock_bh(&br->lock);
1da177e4 LT	280	wasroot = br_is_root_bridge(br);
	281
	282	list_for_each_entry(p, &br->port_list, list) {
	283	if (p->state != BR_STATE_DISABLED &&
	284	br_is_designated_port(p)) {
	285	p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;
	286	p->designated_bridge.prio[1] = newprio & 0xFF;
	287	}
	288
	289	}
	290
	291	br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;
	292	br->bridge_id.prio[1] = newprio & 0xFF;
	293	br_configuration_update(br);
	294	br_port_state_selection(br);
	295	if (br_is_root_bridge(br) && !wasroot)
	296	br_become_root_bridge(br);
2dab80a8	297	spin_unlock_bh(&br->lock);
1da177e4 LT	298	}
	299
	300	/* called under bridge lock */
14f98f25	301	int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio)
1da177e4	302	{
14f98f25	303	port_id new_port_id;
	304
	305	if (newprio > BR_MAX_PORT_PRIORITY)
	306	return -ERANGE;
1da177e4	307
14f98f25	308	new_port_id = br_make_port_id(newprio, p->port_no);
1da177e4 LT	309	if (br_is_designated_port(p))
	310	p->designated_port = new_port_id;
	311
	312	p->port_id = new_port_id;
	313	p->priority = newprio;
	314	if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&
	315	p->port_id < p->designated_port) {
	316	br_become_designated_port(p);
	317	br_port_state_selection(p->br);
	318	}
14f98f25	319
14f98f25	320	return 0;
1da177e4 LT	321	}
	322
	323	/* called under bridge lock */
14f98f25	324	int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost)
1da177e4	325	{
14f98f25	326	if (path_cost < BR_MIN_PATH_COST \|\|
	327	path_cost > BR_MAX_PATH_COST)
	328	return -ERANGE;
	329
8f3359bd	330	p->flags \|= BR_ADMIN_COST;
1da177e4 LT	331	p->path_cost = path_cost;
	332	br_configuration_update(p->br);
	333	br_port_state_selection(p->br);
14f98f25	334	return 0;
1da177e4 LT	335	}
	336
	337	ssize_t br_show_bridge_id(char buf, const struct bridge_id id)
	338	{
	339	return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
	340	id->prio[0], id->prio[1],
	341	id->addr[0], id->addr[1], id->addr[2],
	342	id->addr[3], id->addr[4], id->addr[5]);
	343	}