Viewing file:  br_stp_if.c (5.27 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/*
* 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/if_bridge.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include "br_private.h"
#include "br_private_stp.h"
__u16 br_make_port_id(struct net_bridge_port *p)
{
return (p->priority << 8) | p->port_no;
}
/* called under bridge lock */
void br_init_port(struct net_bridge_port *p)
{
p->port_id = br_make_port_id(p);
br_become_designated_port(p);
p->state = BR_STATE_BLOCKING;
p->topology_change_ack = 0;
p->config_pending = 0;
br_timer_clear(&p->message_age_timer);
br_timer_clear(&p->forward_delay_timer);
br_timer_clear(&p->hold_timer);
}
/* called under bridge lock */
void br_stp_enable_bridge(struct net_bridge *br)
{
struct net_bridge_port *p;
struct timer_list *timer = &br->tick;
init_timer(timer);
timer->data = (unsigned long) br;
timer->function = br_tick;
timer->expires = jiffies + 1;
add_timer(timer);
br_timer_set(&br->hello_timer, jiffies);
br_config_bpdu_generation(br);
p = br->port_list;
while (p != NULL) {
if (p->dev->flags & IFF_UP)
br_stp_enable_port(p);
p = p->next;
}
br_timer_set(&br->gc_timer, jiffies);
}
/* called under bridge lock */
void br_stp_disable_bridge(struct net_bridge *br)
{
struct net_bridge_port *p;
br->topology_change = 0;
br->topology_change_detected = 0;
br_timer_clear(&br->hello_timer);
br_timer_clear(&br->topology_change_timer);
br_timer_clear(&br->tcn_timer);
br_timer_clear(&br->gc_timer);
br_fdb_cleanup(br);
p = br->port_list;
while (p != NULL) {
if (p->state != BR_STATE_DISABLED)
br_stp_disable_port(p);
p = p->next;
}
del_timer(&br->tick);
}
/* 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;
br_timer_clear(&p->message_age_timer);
br_timer_clear(&p->forward_delay_timer);
br_timer_clear(&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, 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);
p = br->port_list;
while (p != NULL) {
if (!memcmp(p->designated_bridge.addr, oldaddr, ETH_ALEN))
memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
if (!memcmp(p->designated_root.addr, oldaddr, ETH_ALEN))
memcpy(p->designated_root.addr, addr, ETH_ALEN);
p = p->next;
}
br_configuration_update(br);
br_port_state_selection(br);
if (br_is_root_bridge(br) && !wasroot)
br_become_root_bridge(br);
}
static unsigned char br_mac_zero[6] = {0,0,0,0,0,0};
/* called under bridge lock */
void br_stp_recalculate_bridge_id(struct net_bridge *br)
{
unsigned char *addr;
struct net_bridge_port *p;
addr = br_mac_zero;
p = br->port_list;
while (p != NULL) {
if (addr == br_mac_zero ||
memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
addr = p->dev->dev_addr;
p = p->next;
}
if (memcmp(br->bridge_id.addr, addr, ETH_ALEN))
br_stp_change_bridge_id(br, addr);
}
/* called under bridge lock */
void br_stp_set_bridge_priority(struct net_bridge *br, int newprio)
{
struct net_bridge_port *p;
int wasroot;
wasroot = br_is_root_bridge(br);
p = br->port_list;
while (p != NULL) {
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;
}
p = p->next;
}
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, int newprio)
{
__u16 new_port_id;
p->priority = newprio & 0xFF;
new_port_id = br_make_port_id(p);
if (br_is_designated_port(p))
p->designated_port = new_port_id;
p->port_id = new_port_id;
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, int path_cost)
{
p->path_cost = path_cost;
br_configuration_update(p->br);
br_port_state_selection(p->br);
}
|