/*
|
/*
|
* Spanning tree protocol; generic parts
|
* Spanning tree protocol; generic parts
|
* Linux ethernet bridge
|
* Linux ethernet bridge
|
*
|
*
|
* Authors:
|
* Authors:
|
* Lennert Buytenhek <buytenh@gnu.org>
|
* Lennert Buytenhek <buytenh@gnu.org>
|
*
|
*
|
* $Id: br_stp.c,v 1.1.1.1 2004-04-15 01:16:25 phoenix Exp $
|
* $Id: br_stp.c,v 1.1.1.1 2004-04-15 01:16:25 phoenix Exp $
|
*
|
*
|
* This program is free software; you can redistribute it and/or
|
* This program is free software; you can redistribute it and/or
|
* modify it under the terms of the GNU General Public License
|
* modify it under the terms of the GNU General Public License
|
* as published by the Free Software Foundation; either version
|
* as published by the Free Software Foundation; either version
|
* 2 of the License, or (at your option) any later version.
|
* 2 of the License, or (at your option) any later version.
|
*/
|
*/
|
|
|
#include <linux/kernel.h>
|
#include <linux/kernel.h>
|
#include <linux/if_bridge.h>
|
#include <linux/if_bridge.h>
|
#include <linux/smp_lock.h>
|
#include <linux/smp_lock.h>
|
#include <asm/uaccess.h>
|
#include <asm/uaccess.h>
|
#include "br_private.h"
|
#include "br_private.h"
|
#include "br_private_stp.h"
|
#include "br_private_stp.h"
|
|
|
|
|
|
|
/* called under ioctl_lock or bridge lock */
|
/* called under ioctl_lock or bridge lock */
|
int br_is_root_bridge(struct net_bridge *br)
|
int br_is_root_bridge(struct net_bridge *br)
|
{
|
{
|
return !memcmp(&br->bridge_id, &br->designated_root, 8);
|
return !memcmp(&br->bridge_id, &br->designated_root, 8);
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
int br_is_designated_port(struct net_bridge_port *p)
|
int br_is_designated_port(struct net_bridge_port *p)
|
{
|
{
|
return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
|
return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
|
(p->designated_port == p->port_id);
|
(p->designated_port == p->port_id);
|
}
|
}
|
|
|
/* called under ioctl_lock or bridge lock */
|
/* called under ioctl_lock or bridge lock */
|
struct net_bridge_port *br_get_port(struct net_bridge *br, int port_no)
|
struct net_bridge_port *br_get_port(struct net_bridge *br, int port_no)
|
{
|
{
|
struct net_bridge_port *p;
|
struct net_bridge_port *p;
|
|
|
p = br->port_list;
|
p = br->port_list;
|
while (p != NULL) {
|
while (p != NULL) {
|
if (p->port_no == port_no)
|
if (p->port_no == port_no)
|
return p;
|
return p;
|
|
|
p = p->next;
|
p = p->next;
|
}
|
}
|
|
|
return NULL;
|
return NULL;
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static int br_should_become_root_port(struct net_bridge_port *p, int root_port)
|
static int br_should_become_root_port(struct net_bridge_port *p, int root_port)
|
{
|
{
|
struct net_bridge *br;
|
struct net_bridge *br;
|
struct net_bridge_port *rp;
|
struct net_bridge_port *rp;
|
int t;
|
int t;
|
|
|
br = p->br;
|
br = p->br;
|
if (p->state == BR_STATE_DISABLED ||
|
if (p->state == BR_STATE_DISABLED ||
|
br_is_designated_port(p))
|
br_is_designated_port(p))
|
return 0;
|
return 0;
|
|
|
if (memcmp(&br->bridge_id, &p->designated_root, 8) <= 0)
|
if (memcmp(&br->bridge_id, &p->designated_root, 8) <= 0)
|
return 0;
|
return 0;
|
|
|
if (!root_port)
|
if (!root_port)
|
return 1;
|
return 1;
|
|
|
rp = br_get_port(br, root_port);
|
rp = br_get_port(br, root_port);
|
|
|
t = memcmp(&p->designated_root, &rp->designated_root, 8);
|
t = memcmp(&p->designated_root, &rp->designated_root, 8);
|
if (t < 0)
|
if (t < 0)
|
return 1;
|
return 1;
|
else if (t > 0)
|
else if (t > 0)
|
return 0;
|
return 0;
|
|
|
if (p->designated_cost + p->path_cost <
|
if (p->designated_cost + p->path_cost <
|
rp->designated_cost + rp->path_cost)
|
rp->designated_cost + rp->path_cost)
|
return 1;
|
return 1;
|
else if (p->designated_cost + p->path_cost >
|
else if (p->designated_cost + p->path_cost >
|
rp->designated_cost + rp->path_cost)
|
rp->designated_cost + rp->path_cost)
|
return 0;
|
return 0;
|
|
|
t = memcmp(&p->designated_bridge, &rp->designated_bridge, 8);
|
t = memcmp(&p->designated_bridge, &rp->designated_bridge, 8);
|
if (t < 0)
|
if (t < 0)
|
return 1;
|
return 1;
|
else if (t > 0)
|
else if (t > 0)
|
return 0;
|
return 0;
|
|
|
if (p->designated_port < rp->designated_port)
|
if (p->designated_port < rp->designated_port)
|
return 1;
|
return 1;
|
else if (p->designated_port > rp->designated_port)
|
else if (p->designated_port > rp->designated_port)
|
return 0;
|
return 0;
|
|
|
if (p->port_id < rp->port_id)
|
if (p->port_id < rp->port_id)
|
return 1;
|
return 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static void br_root_selection(struct net_bridge *br)
|
static void br_root_selection(struct net_bridge *br)
|
{
|
{
|
struct net_bridge_port *p;
|
struct net_bridge_port *p;
|
int root_port;
|
int root_port;
|
|
|
root_port = 0;
|
root_port = 0;
|
|
|
p = br->port_list;
|
p = br->port_list;
|
while (p != NULL) {
|
while (p != NULL) {
|
if (br_should_become_root_port(p, root_port))
|
if (br_should_become_root_port(p, root_port))
|
root_port = p->port_no;
|
root_port = p->port_no;
|
|
|
p = p->next;
|
p = p->next;
|
}
|
}
|
|
|
br->root_port = root_port;
|
br->root_port = root_port;
|
|
|
if (!root_port) {
|
if (!root_port) {
|
br->designated_root = br->bridge_id;
|
br->designated_root = br->bridge_id;
|
br->root_path_cost = 0;
|
br->root_path_cost = 0;
|
} else {
|
} else {
|
p = br_get_port(br, root_port);
|
p = br_get_port(br, root_port);
|
br->designated_root = p->designated_root;
|
br->designated_root = p->designated_root;
|
br->root_path_cost = p->designated_cost + p->path_cost;
|
br->root_path_cost = p->designated_cost + p->path_cost;
|
}
|
}
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
void br_become_root_bridge(struct net_bridge *br)
|
void br_become_root_bridge(struct net_bridge *br)
|
{
|
{
|
br->max_age = br->bridge_max_age;
|
br->max_age = br->bridge_max_age;
|
br->hello_time = br->bridge_hello_time;
|
br->hello_time = br->bridge_hello_time;
|
br->forward_delay = br->bridge_forward_delay;
|
br->forward_delay = br->bridge_forward_delay;
|
br_topology_change_detection(br);
|
br_topology_change_detection(br);
|
br_timer_clear(&br->tcn_timer);
|
br_timer_clear(&br->tcn_timer);
|
br_config_bpdu_generation(br);
|
br_config_bpdu_generation(br);
|
br_timer_set(&br->hello_timer, jiffies);
|
br_timer_set(&br->hello_timer, jiffies);
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
void br_transmit_config(struct net_bridge_port *p)
|
void br_transmit_config(struct net_bridge_port *p)
|
{
|
{
|
struct br_config_bpdu bpdu;
|
struct br_config_bpdu bpdu;
|
struct net_bridge *br;
|
struct net_bridge *br;
|
|
|
if (br_timer_is_running(&p->hold_timer)) {
|
if (br_timer_is_running(&p->hold_timer)) {
|
p->config_pending = 1;
|
p->config_pending = 1;
|
return;
|
return;
|
}
|
}
|
|
|
br = p->br;
|
br = p->br;
|
|
|
bpdu.topology_change = br->topology_change;
|
bpdu.topology_change = br->topology_change;
|
bpdu.topology_change_ack = p->topology_change_ack;
|
bpdu.topology_change_ack = p->topology_change_ack;
|
bpdu.root = br->designated_root;
|
bpdu.root = br->designated_root;
|
bpdu.root_path_cost = br->root_path_cost;
|
bpdu.root_path_cost = br->root_path_cost;
|
bpdu.bridge_id = br->bridge_id;
|
bpdu.bridge_id = br->bridge_id;
|
bpdu.port_id = p->port_id;
|
bpdu.port_id = p->port_id;
|
bpdu.message_age = 0;
|
bpdu.message_age = 0;
|
if (!br_is_root_bridge(br)) {
|
if (!br_is_root_bridge(br)) {
|
struct net_bridge_port *root;
|
struct net_bridge_port *root;
|
unsigned long age;
|
unsigned long age;
|
|
|
root = br_get_port(br, br->root_port);
|
root = br_get_port(br, br->root_port);
|
age = br_timer_get_residue(&root->message_age_timer) + 1;
|
age = br_timer_get_residue(&root->message_age_timer) + 1;
|
bpdu.message_age = age;
|
bpdu.message_age = age;
|
}
|
}
|
bpdu.max_age = br->max_age;
|
bpdu.max_age = br->max_age;
|
bpdu.hello_time = br->hello_time;
|
bpdu.hello_time = br->hello_time;
|
bpdu.forward_delay = br->forward_delay;
|
bpdu.forward_delay = br->forward_delay;
|
|
|
br_send_config_bpdu(p, &bpdu);
|
br_send_config_bpdu(p, &bpdu);
|
|
|
p->topology_change_ack = 0;
|
p->topology_change_ack = 0;
|
p->config_pending = 0;
|
p->config_pending = 0;
|
br_timer_set(&p->hold_timer, jiffies);
|
br_timer_set(&p->hold_timer, jiffies);
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static void br_record_config_information(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
|
static void br_record_config_information(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
|
{
|
{
|
p->designated_root = bpdu->root;
|
p->designated_root = bpdu->root;
|
p->designated_cost = bpdu->root_path_cost;
|
p->designated_cost = bpdu->root_path_cost;
|
p->designated_bridge = bpdu->bridge_id;
|
p->designated_bridge = bpdu->bridge_id;
|
p->designated_port = bpdu->port_id;
|
p->designated_port = bpdu->port_id;
|
|
|
br_timer_set(&p->message_age_timer, jiffies - bpdu->message_age);
|
br_timer_set(&p->message_age_timer, jiffies - bpdu->message_age);
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static void br_record_config_timeout_values(struct net_bridge *br, struct br_config_bpdu *bpdu)
|
static void br_record_config_timeout_values(struct net_bridge *br, struct br_config_bpdu *bpdu)
|
{
|
{
|
br->max_age = bpdu->max_age;
|
br->max_age = bpdu->max_age;
|
br->hello_time = bpdu->hello_time;
|
br->hello_time = bpdu->hello_time;
|
br->forward_delay = bpdu->forward_delay;
|
br->forward_delay = bpdu->forward_delay;
|
br->topology_change = bpdu->topology_change;
|
br->topology_change = bpdu->topology_change;
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
void br_transmit_tcn(struct net_bridge *br)
|
void br_transmit_tcn(struct net_bridge *br)
|
{
|
{
|
br_send_tcn_bpdu(br_get_port(br, br->root_port));
|
br_send_tcn_bpdu(br_get_port(br, br->root_port));
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static int br_should_become_designated_port(struct net_bridge_port *p)
|
static int br_should_become_designated_port(struct net_bridge_port *p)
|
{
|
{
|
struct net_bridge *br;
|
struct net_bridge *br;
|
int t;
|
int t;
|
|
|
br = p->br;
|
br = p->br;
|
if (br_is_designated_port(p))
|
if (br_is_designated_port(p))
|
return 1;
|
return 1;
|
|
|
if (memcmp(&p->designated_root, &br->designated_root, 8))
|
if (memcmp(&p->designated_root, &br->designated_root, 8))
|
return 1;
|
return 1;
|
|
|
if (br->root_path_cost < p->designated_cost)
|
if (br->root_path_cost < p->designated_cost)
|
return 1;
|
return 1;
|
else if (br->root_path_cost > p->designated_cost)
|
else if (br->root_path_cost > p->designated_cost)
|
return 0;
|
return 0;
|
|
|
t = memcmp(&br->bridge_id, &p->designated_bridge, 8);
|
t = memcmp(&br->bridge_id, &p->designated_bridge, 8);
|
if (t < 0)
|
if (t < 0)
|
return 1;
|
return 1;
|
else if (t > 0)
|
else if (t > 0)
|
return 0;
|
return 0;
|
|
|
if (p->port_id < p->designated_port)
|
if (p->port_id < p->designated_port)
|
return 1;
|
return 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static void br_designated_port_selection(struct net_bridge *br)
|
static void br_designated_port_selection(struct net_bridge *br)
|
{
|
{
|
struct net_bridge_port *p;
|
struct net_bridge_port *p;
|
|
|
p = br->port_list;
|
p = br->port_list;
|
while (p != NULL) {
|
while (p != NULL) {
|
if (p->state != BR_STATE_DISABLED &&
|
if (p->state != BR_STATE_DISABLED &&
|
br_should_become_designated_port(p))
|
br_should_become_designated_port(p))
|
br_become_designated_port(p);
|
br_become_designated_port(p);
|
|
|
p = p->next;
|
p = p->next;
|
}
|
}
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static int br_supersedes_port_info(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
|
static int br_supersedes_port_info(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
|
{
|
{
|
int t;
|
int t;
|
|
|
t = memcmp(&bpdu->root, &p->designated_root, 8);
|
t = memcmp(&bpdu->root, &p->designated_root, 8);
|
if (t < 0)
|
if (t < 0)
|
return 1;
|
return 1;
|
else if (t > 0)
|
else if (t > 0)
|
return 0;
|
return 0;
|
|
|
if (bpdu->root_path_cost < p->designated_cost)
|
if (bpdu->root_path_cost < p->designated_cost)
|
return 1;
|
return 1;
|
else if (bpdu->root_path_cost > p->designated_cost)
|
else if (bpdu->root_path_cost > p->designated_cost)
|
return 0;
|
return 0;
|
|
|
t = memcmp(&bpdu->bridge_id, &p->designated_bridge, 8);
|
t = memcmp(&bpdu->bridge_id, &p->designated_bridge, 8);
|
if (t < 0)
|
if (t < 0)
|
return 1;
|
return 1;
|
else if (t > 0)
|
else if (t > 0)
|
return 0;
|
return 0;
|
|
|
if (memcmp(&bpdu->bridge_id, &p->br->bridge_id, 8))
|
if (memcmp(&bpdu->bridge_id, &p->br->bridge_id, 8))
|
return 1;
|
return 1;
|
|
|
if (bpdu->port_id <= p->designated_port)
|
if (bpdu->port_id <= p->designated_port)
|
return 1;
|
return 1;
|
|
|
return 0;
|
return 0;
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static void br_topology_change_acknowledged(struct net_bridge *br)
|
static void br_topology_change_acknowledged(struct net_bridge *br)
|
{
|
{
|
br->topology_change_detected = 0;
|
br->topology_change_detected = 0;
|
br_timer_clear(&br->tcn_timer);
|
br_timer_clear(&br->tcn_timer);
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
void br_topology_change_detection(struct net_bridge *br)
|
void br_topology_change_detection(struct net_bridge *br)
|
{
|
{
|
printk(KERN_INFO "%s: topology change detected", br->dev.name);
|
printk(KERN_INFO "%s: topology change detected", br->dev.name);
|
|
|
if (br_is_root_bridge(br)) {
|
if (br_is_root_bridge(br)) {
|
printk(", propagating");
|
printk(", propagating");
|
br->topology_change = 1;
|
br->topology_change = 1;
|
br_timer_set(&br->topology_change_timer, jiffies);
|
br_timer_set(&br->topology_change_timer, jiffies);
|
} else if (!br->topology_change_detected) {
|
} else if (!br->topology_change_detected) {
|
printk(", sending tcn bpdu");
|
printk(", sending tcn bpdu");
|
br_transmit_tcn(br);
|
br_transmit_tcn(br);
|
br_timer_set(&br->tcn_timer, jiffies);
|
br_timer_set(&br->tcn_timer, jiffies);
|
}
|
}
|
|
|
printk("\n");
|
printk("\n");
|
br->topology_change_detected = 1;
|
br->topology_change_detected = 1;
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
void br_config_bpdu_generation(struct net_bridge *br)
|
void br_config_bpdu_generation(struct net_bridge *br)
|
{
|
{
|
struct net_bridge_port *p;
|
struct net_bridge_port *p;
|
|
|
p = br->port_list;
|
p = br->port_list;
|
while (p != NULL) {
|
while (p != NULL) {
|
if (p->state != BR_STATE_DISABLED &&
|
if (p->state != BR_STATE_DISABLED &&
|
br_is_designated_port(p))
|
br_is_designated_port(p))
|
br_transmit_config(p);
|
br_transmit_config(p);
|
|
|
p = p->next;
|
p = p->next;
|
}
|
}
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static void br_reply(struct net_bridge_port *p)
|
static void br_reply(struct net_bridge_port *p)
|
{
|
{
|
br_transmit_config(p);
|
br_transmit_config(p);
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
void br_configuration_update(struct net_bridge *br)
|
void br_configuration_update(struct net_bridge *br)
|
{
|
{
|
br_root_selection(br);
|
br_root_selection(br);
|
br_designated_port_selection(br);
|
br_designated_port_selection(br);
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
void br_become_designated_port(struct net_bridge_port *p)
|
void br_become_designated_port(struct net_bridge_port *p)
|
{
|
{
|
struct net_bridge *br;
|
struct net_bridge *br;
|
|
|
br = p->br;
|
br = p->br;
|
p->designated_root = br->designated_root;
|
p->designated_root = br->designated_root;
|
p->designated_cost = br->root_path_cost;
|
p->designated_cost = br->root_path_cost;
|
p->designated_bridge = br->bridge_id;
|
p->designated_bridge = br->bridge_id;
|
p->designated_port = p->port_id;
|
p->designated_port = p->port_id;
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static void br_make_blocking(struct net_bridge_port *p)
|
static void br_make_blocking(struct net_bridge_port *p)
|
{
|
{
|
if (p->state != BR_STATE_DISABLED &&
|
if (p->state != BR_STATE_DISABLED &&
|
p->state != BR_STATE_BLOCKING) {
|
p->state != BR_STATE_BLOCKING) {
|
if (p->state == BR_STATE_FORWARDING ||
|
if (p->state == BR_STATE_FORWARDING ||
|
p->state == BR_STATE_LEARNING)
|
p->state == BR_STATE_LEARNING)
|
br_topology_change_detection(p->br);
|
br_topology_change_detection(p->br);
|
|
|
printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
|
printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
|
p->br->dev.name, p->port_no, p->dev->name, "blocking");
|
p->br->dev.name, p->port_no, p->dev->name, "blocking");
|
|
|
p->state = BR_STATE_BLOCKING;
|
p->state = BR_STATE_BLOCKING;
|
br_timer_clear(&p->forward_delay_timer);
|
br_timer_clear(&p->forward_delay_timer);
|
}
|
}
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static void br_make_forwarding(struct net_bridge_port *p)
|
static void br_make_forwarding(struct net_bridge_port *p)
|
{
|
{
|
if (p->state == BR_STATE_BLOCKING) {
|
if (p->state == BR_STATE_BLOCKING) {
|
if (p->br->stp_enabled) {
|
if (p->br->stp_enabled) {
|
printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
|
printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
|
p->br->dev.name, p->port_no, p->dev->name,
|
p->br->dev.name, p->port_no, p->dev->name,
|
"listening");
|
"listening");
|
|
|
p->state = BR_STATE_LISTENING;
|
p->state = BR_STATE_LISTENING;
|
} else {
|
} else {
|
printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
|
printk(KERN_INFO "%s: port %i(%s) entering %s state\n",
|
p->br->dev.name, p->port_no, p->dev->name,
|
p->br->dev.name, p->port_no, p->dev->name,
|
"learning");
|
"learning");
|
|
|
p->state = BR_STATE_LEARNING;
|
p->state = BR_STATE_LEARNING;
|
}
|
}
|
br_timer_set(&p->forward_delay_timer, jiffies);
|
br_timer_set(&p->forward_delay_timer, jiffies);
|
}
|
}
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
void br_port_state_selection(struct net_bridge *br)
|
void br_port_state_selection(struct net_bridge *br)
|
{
|
{
|
struct net_bridge_port *p;
|
struct net_bridge_port *p;
|
|
|
p = br->port_list;
|
p = br->port_list;
|
while (p != NULL) {
|
while (p != NULL) {
|
if (p->state != BR_STATE_DISABLED) {
|
if (p->state != BR_STATE_DISABLED) {
|
if (p->port_no == br->root_port) {
|
if (p->port_no == br->root_port) {
|
p->config_pending = 0;
|
p->config_pending = 0;
|
p->topology_change_ack = 0;
|
p->topology_change_ack = 0;
|
br_make_forwarding(p);
|
br_make_forwarding(p);
|
} else if (br_is_designated_port(p)) {
|
} else if (br_is_designated_port(p)) {
|
br_timer_clear(&p->message_age_timer);
|
br_timer_clear(&p->message_age_timer);
|
br_make_forwarding(p);
|
br_make_forwarding(p);
|
} else {
|
} else {
|
p->config_pending = 0;
|
p->config_pending = 0;
|
p->topology_change_ack = 0;
|
p->topology_change_ack = 0;
|
br_make_blocking(p);
|
br_make_blocking(p);
|
}
|
}
|
}
|
}
|
|
|
p = p->next;
|
p = p->next;
|
}
|
}
|
}
|
}
|
|
|
/* called under bridge lock */
|
/* called under bridge lock */
|
static void br_topology_change_acknowledge(struct net_bridge_port *p)
|
static void br_topology_change_acknowledge(struct net_bridge_port *p)
|
{
|
{
|
p->topology_change_ack = 1;
|
p->topology_change_ack = 1;
|
br_transmit_config(p);
|
br_transmit_config(p);
|
}
|
}
|
|
|
/* lock-safe */
|
/* lock-safe */
|
void br_received_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
|
void br_received_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
|
{
|
{
|
struct net_bridge *br;
|
struct net_bridge *br;
|
int was_root;
|
int was_root;
|
|
|
if (p->state == BR_STATE_DISABLED)
|
if (p->state == BR_STATE_DISABLED)
|
return;
|
return;
|
|
|
br = p->br;
|
br = p->br;
|
read_lock(&br->lock);
|
read_lock(&br->lock);
|
|
|
was_root = br_is_root_bridge(br);
|
was_root = br_is_root_bridge(br);
|
if (br_supersedes_port_info(p, bpdu)) {
|
if (br_supersedes_port_info(p, bpdu)) {
|
br_record_config_information(p, bpdu);
|
br_record_config_information(p, bpdu);
|
br_configuration_update(br);
|
br_configuration_update(br);
|
br_port_state_selection(br);
|
br_port_state_selection(br);
|
|
|
if (!br_is_root_bridge(br) && was_root) {
|
if (!br_is_root_bridge(br) && was_root) {
|
br_timer_clear(&br->hello_timer);
|
br_timer_clear(&br->hello_timer);
|
if (br->topology_change_detected) {
|
if (br->topology_change_detected) {
|
br_timer_clear(&br->topology_change_timer);
|
br_timer_clear(&br->topology_change_timer);
|
br_transmit_tcn(br);
|
br_transmit_tcn(br);
|
br_timer_set(&br->tcn_timer, jiffies);
|
br_timer_set(&br->tcn_timer, jiffies);
|
}
|
}
|
}
|
}
|
|
|
if (p->port_no == br->root_port) {
|
if (p->port_no == br->root_port) {
|
br_record_config_timeout_values(br, bpdu);
|
br_record_config_timeout_values(br, bpdu);
|
br_config_bpdu_generation(br);
|
br_config_bpdu_generation(br);
|
if (bpdu->topology_change_ack)
|
if (bpdu->topology_change_ack)
|
br_topology_change_acknowledged(br);
|
br_topology_change_acknowledged(br);
|
}
|
}
|
} else if (br_is_designated_port(p)) {
|
} else if (br_is_designated_port(p)) {
|
br_reply(p);
|
br_reply(p);
|
}
|
}
|
|
|
read_unlock(&br->lock);
|
read_unlock(&br->lock);
|
}
|
}
|
|
|
/* lock-safe */
|
/* lock-safe */
|
void br_received_tcn_bpdu(struct net_bridge_port *p)
|
void br_received_tcn_bpdu(struct net_bridge_port *p)
|
{
|
{
|
read_lock(&p->br->lock);
|
read_lock(&p->br->lock);
|
if (p->state != BR_STATE_DISABLED &&
|
if (p->state != BR_STATE_DISABLED &&
|
br_is_designated_port(p)) {
|
br_is_designated_port(p)) {
|
printk(KERN_INFO "%s: received tcn bpdu on port %i(%s)\n",
|
printk(KERN_INFO "%s: received tcn bpdu on port %i(%s)\n",
|
p->br->dev.name, p->port_no, p->dev->name);
|
p->br->dev.name, p->port_no, p->dev->name);
|
|
|
br_topology_change_detection(p->br);
|
br_topology_change_detection(p->br);
|
br_topology_change_acknowledge(p);
|
br_topology_change_acknowledge(p);
|
}
|
}
|
read_unlock(&p->br->lock);
|
read_unlock(&p->br->lock);
|
}
|
}
|
|
|
