[linux-2.6-block.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 "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;

	br_stp_port_timer_init(p);
}

/* 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(&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(&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);
}

/* 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");

	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_configuration_update(br);

	br_port_state_selection(br);

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

/* called under bridge lock */
static 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 ||
		    compare_ether_addr(p->dev->dev_addr, addr) < 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>
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.
	25	* NB: least significant bits of priority are dropped to
	26	* make room for more ports.
	27	*/
	28	static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
	29	{
	30	return ((u16)priority << BR_PORT_BITS)
	31	\| (port_no & ((1<<BR_PORT_BITS)-1));
	32	}
	33
	34	/* called under bridge lock */
	35	void br_init_port(struct net_bridge_port *p)
	36	{
	37	p->port_id = br_make_port_id(p->priority, p->port_no);
	38	br_become_designated_port(p);
	39	p->state = BR_STATE_BLOCKING;
	40	p->topology_change_ack = 0;
	41	p->config_pending = 0;
	42
	43	br_stp_port_timer_init(p);
	44	}
	45
	46	/* called under bridge lock */
	47	void br_stp_enable_bridge(struct net_bridge *br)
	48	{
	49	struct net_bridge_port *p;
	50
	51	spin_lock_bh(&br->lock);
	52	mod_timer(&br->hello_timer, jiffies + br->hello_time);
	53	mod_timer(&br->gc_timer, jiffies + HZ/10);
	54
	55	br_config_bpdu_generation(br);
	56
	57	list_for_each_entry(p, &br->port_list, list) {
	58	if ((p->dev->flags & IFF_UP) && netif_carrier_ok(p->dev))
	59	br_stp_enable_port(p);
	60
	61	}
	62	spin_unlock_bh(&br->lock);
	63	}
	64
	65	/* NO locks held */
	66	void br_stp_disable_bridge(struct net_bridge *br)
	67	{
	68	struct net_bridge_port *p;
	69
	70	spin_lock(&br->lock);
	71	list_for_each_entry(p, &br->port_list, list) {
	72	if (p->state != BR_STATE_DISABLED)
	73	br_stp_disable_port(p);
	74
	75	}
	76
	77	br->topology_change = 0;
	78	br->topology_change_detected = 0;
	79	spin_unlock(&br->lock);
	80
	81	del_timer_sync(&br->hello_timer);
	82	del_timer_sync(&br->topology_change_timer);
83	del_timer_sync(&br->tcn_timer);
84	del_timer_sync(&br->gc_timer);
85	}
86
87	/* called under bridge lock */
88	void br_stp_enable_port(struct net_bridge_port *p)
89	{
90	br_init_port(p);
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
104	wasroot = br_is_root_bridge(br);
105	br_become_designated_port(p);
106	p->state = BR_STATE_DISABLED;
107	p->topology_change_ack = 0;
108	p->config_pending = 0;
109
110	del_timer(&p->message_age_timer);
111	del_timer(&p->forward_delay_timer);
112	del_timer(&p->hold_timer);
113
114	br_configuration_update(br);
115
116	br_port_state_selection(br);
117
118	if (br_is_root_bridge(br) && !wasroot)
119	br_become_root_bridge(br);
120	}
121
122	/* called under bridge lock */
123	static void br_stp_change_bridge_id(struct net_bridge *br,
124	const unsigned char *addr)
125	{
126	unsigned char oldaddr[6];
127	struct net_bridge_port *p;
128	int wasroot;
129
130	wasroot = br_is_root_bridge(br);
131
132	memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
133	memcpy(br->bridge_id.addr, addr, ETH_ALEN);
134	memcpy(br->dev->dev_addr, addr, ETH_ALEN);
135
136	list_for_each_entry(p, &br->port_list, list) {
6ede2463	137	if (!compare_ether_addr(p->designated_bridge.addr, oldaddr))
1da177e4 LT	138	memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
1da177e4 LT	139
6ede2463	140	if (!compare_ether_addr(p->designated_root.addr, oldaddr))
1da177e4 LT	141	memcpy(p->designated_root.addr, addr, ETH_ALEN);
	142
	143	}
	144
	145	br_configuration_update(br);
	146	br_port_state_selection(br);
	147	if (br_is_root_bridge(br) && !wasroot)
	148	br_become_root_bridge(br);
	149	}
	150
	151	static const unsigned char br_mac_zero[6];
	152
	153	/* called under bridge lock */
	154	void br_stp_recalculate_bridge_id(struct net_bridge *br)
	155	{
	156	const unsigned char *addr = br_mac_zero;
	157	struct net_bridge_port *p;
	158
	159	list_for_each_entry(p, &br->port_list, list) {
	160	if (addr == br_mac_zero \|\|
6ede2463	161	compare_ether_addr(p->dev->dev_addr, addr) < 0)
1da177e4 LT	162	addr = p->dev->dev_addr;
	163
	164	}
	165
6ede2463	166	if (compare_ether_addr(br->bridge_id.addr, addr))
1da177e4 LT	167	br_stp_change_bridge_id(br, addr);
	168	}
	169
	170	/* called under bridge lock */
	171	void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
	172	{
	173	struct net_bridge_port *p;
	174	int wasroot;
	175
	176	wasroot = br_is_root_bridge(br);
	177
	178	list_for_each_entry(p, &br->port_list, list) {
	179	if (p->state != BR_STATE_DISABLED &&
	180	br_is_designated_port(p)) {
	181	p->designated_bridge.prio[0] = (newprio >> 8) & 0xFF;
	182	p->designated_bridge.prio[1] = newprio & 0xFF;
	183	}
	184
	185	}
	186
	187	br->bridge_id.prio[0] = (newprio >> 8) & 0xFF;
	188	br->bridge_id.prio[1] = newprio & 0xFF;
	189	br_configuration_update(br);
	190	br_port_state_selection(br);
	191	if (br_is_root_bridge(br) && !wasroot)
	192	br_become_root_bridge(br);
	193	}
	194
	195	/* called under bridge lock */
	196	void br_stp_set_port_priority(struct net_bridge_port *p, u8 newprio)
	197	{
	198	port_id new_port_id = br_make_port_id(newprio, p->port_no);
	199
	200	if (br_is_designated_port(p))
	201	p->designated_port = new_port_id;
	202
	203	p->port_id = new_port_id;
	204	p->priority = newprio;
	205	if (!memcmp(&p->br->bridge_id, &p->designated_bridge, 8) &&
	206	p->port_id < p->designated_port) {
	207	br_become_designated_port(p);
	208	br_port_state_selection(p->br);
	209	}
	210	}
	211
	212	/* called under bridge lock */
	213	void br_stp_set_path_cost(struct net_bridge_port *p, u32 path_cost)
	214	{
	215	p->path_cost = path_cost;
	216	br_configuration_update(p->br);
	217	br_port_state_selection(p->br);
	218	}
	219
	220	ssize_t br_show_bridge_id(char buf, const struct bridge_id id)
	221	{
	222	return sprintf(buf, "%.2x%.2x.%.2x%.2x%.2x%.2x%.2x%.2x\n",
	223	id->prio[0], id->prio[1],
	224	id->addr[0], id->addr[1], id->addr[2],
	225	id->addr[3], id->addr[4], id->addr[5]);
	226	}