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

/*
 *	Spanning tree protocol; interface code
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Lennert Buytenhek		<buytenh@gnu.org>
 *
 *	$Id: br_stp_if.c,v 1.4 2001/04/14 21:14:39 davem Exp $
 *
 *	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/smp_lock.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>

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


/* Port id is composed of priority and port number.
 * NB: least significant 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));
}

/* called under bridge lock */
void br_init_port(struct net_bridge_port *p)
{
	p->port_id = br_make_port_id(p->priority, p->port_no);
	br_become_designated_port(p);
	p->state = BR_STATE_BLOCKING;
	p->topology_change_ack = 0;
	p->config_pending = 0;
}

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

	spin_lock_bh(&br->lock);
	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 ((p->dev->flags & IFF_UP) && netif_carrier_ok(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_ifinfo_notify(RTM_NEWLINK, p);
	br_port_state_selection(p->br);
}

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

	br = p->br;
	printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
	       br->dev->name, p->port_no, p->dev->name, "disabled");

	br_ifinfo_notify(RTM_DELLINK, p);

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

	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);

	br_configuration_update(br);

	br_port_state_selection(br);

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

/* called under bridge lock */
void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr)
{
	unsigned char oldaddr[6];
	struct net_bridge_port *p;
	int wasroot;

	wasroot = br_is_root_bridge(br);

	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 (!compare_ether_addr(p->designated_bridge.addr, oldaddr))
			memcpy(p->designated_bridge.addr, addr, ETH_ALEN);

		if (!compare_ether_addr(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);
}

static const unsigned char br_mac_zero[6];

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

	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 (compare_ether_addr(br->bridge_id.addr, addr))
		br_stp_change_bridge_id(br, addr);
}

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

	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);
}

/* called under bridge lock */
void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio)
{
	port_id 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);
	}
}

/* called under bridge lock */
void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost)
{
	p->path_cost = path_cost;
	br_configuration_update(p->br);
	br_port_state_selection(p->br);
}

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	*
	8	* $Id: br_stp_if.c,v 1.4 2001/04/14 21:14:39 davem Exp $
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/smp_lock.h>
6ede2463	18	#include <linux/etherdevice.h>
11dc1f36	19	#include <linux/rtnetlink.h>
1da177e4 LT	20
	21	#include "br_private.h"
	22	#include "br_private_stp.h"
	23
	24
	25	/* Port id is composed of priority and port number.
	26	* NB: least significant bits of priority are dropped to
	27	* make room for more ports.
	28	*/
	29	static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
	30	{
9d6f229f	31	return ((u16)priority << BR_PORT_BITS)
1da177e4 LT	32	\| (port_no & ((1<<BR_PORT_BITS)-1));
	33	}
	34
	35	/* called under bridge lock */
	36	void br_init_port(struct net_bridge_port *p)
	37	{
	38	p->port_id = br_make_port_id(p->priority, p->port_no);
	39	br_become_designated_port(p);
	40	p->state = BR_STATE_BLOCKING;
	41	p->topology_change_ack = 0;
	42	p->config_pending = 0;
1da177e4 LT	43	}
	44
	45	/* called under bridge lock */
	46	void br_stp_enable_bridge(struct net_bridge *br)
	47	{
	48	struct net_bridge_port *p;
	49
	50	spin_lock_bh(&br->lock);
	51	mod_timer(&br->hello_timer, jiffies + br->hello_time);
	52	mod_timer(&br->gc_timer, jiffies + HZ/10);
9d6f229f	53
1da177e4 LT	54	br_config_bpdu_generation(br);
	55
	56	list_for_each_entry(p, &br->port_list, list) {
	57	if ((p->dev->flags & IFF_UP) && netif_carrier_ok(p->dev))
	58	br_stp_enable_port(p);
	59
	60	}
	61	spin_unlock_bh(&br->lock);
	62	}
	63
	64	/* NO locks held */
	65	void br_stp_disable_bridge(struct net_bridge *br)
	66	{
	67	struct net_bridge_port *p;
	68
78872ccb	69	spin_lock_bh(&br->lock);
1da177e4 LT	70	list_for_each_entry(p, &br->port_list, list) {
	71	if (p->state != BR_STATE_DISABLED)
	72	br_stp_disable_port(p);
	73
	74	}
	75
	76	br->topology_change = 0;
	77	br->topology_change_detected = 0;
78872ccb	78	spin_unlock_bh(&br->lock);
1da177e4 LT	79
	80	del_timer_sync(&br->hello_timer);
	81	del_timer_sync(&br->topology_change_timer);
	82	del_timer_sync(&br->tcn_timer);
	83	del_timer_sync(&br->gc_timer);
	84	}
	85
	86	/* called under bridge lock */
	87	void br_stp_enable_port(struct net_bridge_port *p)
	88	{
	89	br_init_port(p);
11dc1f36	90	br_ifinfo_notify(RTM_NEWLINK, p);
1da177e4 LT	91	br_port_state_selection(p->br);
	92	}
	93
	94	/* called under bridge lock */
	95	void br_stp_disable_port(struct net_bridge_port *p)
	96	{
	97	struct net_bridge *br;
	98	int wasroot;
	99
	100	br = p->br;
	101	printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
	102	br->dev->name, p->port_no, p->dev->name, "disabled");
	103
11dc1f36 SH	104	br_ifinfo_notify(RTM_DELLINK, p);
11dc1f36 SH	105
1da177e4 LT	106	wasroot = br_is_root_bridge(br);
	107	br_become_designated_port(p);
	108	p->state = BR_STATE_DISABLED;
	109	p->topology_change_ack = 0;
	110	p->config_pending = 0;
	111
	112	del_timer(&p->message_age_timer);
	113	del_timer(&p->forward_delay_timer);
	114	del_timer(&p->hold_timer);
	115
1a620698 SH	116	br_fdb_delete_by_port(br, p, 0);
1a620698 SH	117
1da177e4 LT	118	br_configuration_update(br);
	119
	120	br_port_state_selection(br);
	121
	122	if (br_is_root_bridge(br) && !wasroot)
	123	br_become_root_bridge(br);
	124	}
	125
	126	/* called under bridge lock */
4505a3ef	127	void br_stp_change_bridge_id(struct net_bridge br, const unsigned char addr)
1da177e4 LT	128	{
	129	unsigned char oldaddr[6];
	130	struct net_bridge_port *p;
	131	int wasroot;
	132
	133	wasroot = br_is_root_bridge(br);
	134
	135	memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
	136	memcpy(br->bridge_id.addr, addr, ETH_ALEN);
	137	memcpy(br->dev->dev_addr, addr, ETH_ALEN);
	138
	139	list_for_each_entry(p, &br->port_list, list) {
6ede2463	140	if (!compare_ether_addr(p->designated_bridge.addr, oldaddr))
1da177e4 LT	141	memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
1da177e4 LT	142
6ede2463	143	if (!compare_ether_addr(p->designated_root.addr, oldaddr))
1da177e4 LT	144	memcpy(p->designated_root.addr, addr, ETH_ALEN);
	145
	146	}
	147
	148	br_configuration_update(br);
	149	br_port_state_selection(br);
	150	if (br_is_root_bridge(br) && !wasroot)
	151	br_become_root_bridge(br);
	152	}
	153
	154	static const unsigned char br_mac_zero[6];
	155
	156	/* called under bridge lock */
	157	void br_stp_recalculate_bridge_id(struct net_bridge *br)
	158	{
	159	const unsigned char *addr = br_mac_zero;
	160	struct net_bridge_port *p;
	161
	162	list_for_each_entry(p, &br->port_list, list) {
	163	if (addr == br_mac_zero \|\|
554c9a8e	164	memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
1da177e4 LT	165	addr = p->dev->dev_addr;
	166
	167	}
	168
6ede2463	169	if (compare_ether_addr(br->bridge_id.addr, addr))
1da177e4 LT	170	br_stp_change_bridge_id(br, addr);
	171	}
	172
	173	/* called under bridge lock */
	174	void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
	175	{
	176	struct net_bridge_port *p;
	177	int wasroot;
	178
	179	wasroot = br_is_root_bridge(br);
	180
	181	list_for_each_entry(p, &br->port_list, list) {
	182	if (p->state != BR_STATE_DISABLED &&
	183	br_is_designated_port(p)) {
	184	p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;
	185	p->designated_bridge.prio[1] = newprio & 0xFF;
	186	}
	187
	188	}
	189
	190	br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;
	191	br->bridge_id.prio[1] = newprio & 0xFF;
	192	br_configuration_update(br);
	193	br_port_state_selection(br);
	194	if (br_is_root_bridge(br) && !wasroot)
	195	br_become_root_bridge(br);
	196	}
	197
	198	/* called under bridge lock */
	199	void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio)
	200	{
	201	port_id new_port_id = br_make_port_id(newprio, p->port_no);
	202
	203	if (br_is_designated_port(p))
	204	p->designated_port = new_port_id;
	205
	206	p->port_id = new_port_id;
	207	p->priority = newprio;
	208	if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&
	209	p->port_id < p->designated_port) {
	210	br_become_designated_port(p);
	211	br_port_state_selection(p->br);
	212	}
	213	}
	214
	215	/* called under bridge lock */
	216	void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost)
	217	{
	218	p->path_cost = path_cost;
	219	br_configuration_update(p->br);
	220	br_port_state_selection(p->br);
	221	}
	222
	223	ssize_t br_show_bridge_id(char buf, const struct bridge_id id)
	224	{
	225	return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
	226	id->prio[0], id->prio[1],
	227	id->addr[0], id->addr[1], id->addr[2],
	228	id->addr[3], id->addr[4], id->addr[5]);
	229	}