2005-04-17 00:20:36 +02:00
|
|
|
/*
|
|
|
|
* Spanning tree protocol; generic parts
|
|
|
|
* 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>
|
2008-05-12 21:21:05 +02:00
|
|
|
#include <linux/rculist.h>
|
2014-11-28 14:34:20 +01:00
|
|
|
#include <net/switchdev.h>
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
#include "br_private.h"
|
|
|
|
#include "br_private_stp.h"
|
|
|
|
|
|
|
|
/* since time values in bpdu are in jiffies and then scaled (1/256)
|
2012-03-01 09:12:18 +01:00
|
|
|
* before sending, make sure that is at least one STP tick.
|
2005-04-17 00:20:36 +02:00
|
|
|
*/
|
2012-03-01 09:12:18 +01:00
|
|
|
#define MESSAGE_AGE_INCR ((HZ / 256) + 1)
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2009-08-05 19:42:58 +02:00
|
|
|
static const char *const br_port_state_names[] = {
|
2007-02-09 15:24:35 +01:00
|
|
|
[BR_STATE_DISABLED] = "disabled",
|
2005-04-17 00:20:36 +02:00
|
|
|
[BR_STATE_LISTENING] = "listening",
|
2007-02-09 15:24:35 +01:00
|
|
|
[BR_STATE_LEARNING] = "learning",
|
|
|
|
[BR_STATE_FORWARDING] = "forwarding",
|
2005-04-17 00:20:36 +02:00
|
|
|
[BR_STATE_BLOCKING] = "blocking",
|
|
|
|
};
|
|
|
|
|
2014-10-01 01:13:19 +02:00
|
|
|
void br_set_state(struct net_bridge_port *p, unsigned int state)
|
|
|
|
{
|
2015-05-10 18:47:51 +02:00
|
|
|
struct switchdev_attr attr = {
|
2015-12-15 16:03:35 +01:00
|
|
|
.orig_dev = p->dev,
|
2015-10-01 11:03:42 +02:00
|
|
|
.id = SWITCHDEV_ATTR_ID_PORT_STP_STATE,
|
2015-10-14 19:40:50 +02:00
|
|
|
.flags = SWITCHDEV_F_DEFER,
|
2015-05-13 20:16:50 +02:00
|
|
|
.u.stp_state = state,
|
2015-05-10 18:47:51 +02:00
|
|
|
};
|
2014-11-28 14:34:20 +01:00
|
|
|
int err;
|
|
|
|
|
2014-10-01 01:13:19 +02:00
|
|
|
p->state = state;
|
2015-05-10 18:47:51 +02:00
|
|
|
err = switchdev_port_attr_set(p->dev, &attr);
|
2015-11-13 12:06:12 +01:00
|
|
|
if (err && err != -EOPNOTSUPP)
|
2014-11-28 14:34:20 +01:00
|
|
|
br_warn(p->br, "error setting offload STP state on port %u(%s)\n",
|
|
|
|
(unsigned int) p->port_no, p->dev->name);
|
2016-02-16 16:09:51 +01:00
|
|
|
else
|
|
|
|
br_info(p->br, "port %u(%s) entered %s state\n",
|
|
|
|
(unsigned int) p->port_no, p->dev->name,
|
|
|
|
br_port_state_names[p->state]);
|
2014-10-01 01:13:19 +02:00
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/* called under bridge lock */
|
|
|
|
struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no)
|
|
|
|
{
|
|
|
|
struct net_bridge_port *p;
|
|
|
|
|
|
|
|
list_for_each_entry_rcu(p, &br->port_list, list) {
|
|
|
|
if (p->port_no == port_no)
|
|
|
|
return p;
|
|
|
|
}
|
|
|
|
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2007-02-09 15:24:35 +01:00
|
|
|
static int br_should_become_root_port(const struct net_bridge_port *p,
|
2005-04-17 00:20:36 +02:00
|
|
|
u16 root_port)
|
|
|
|
{
|
|
|
|
struct net_bridge *br;
|
|
|
|
struct net_bridge_port *rp;
|
|
|
|
int t;
|
|
|
|
|
|
|
|
br = p->br;
|
|
|
|
if (p->state == BR_STATE_DISABLED ||
|
|
|
|
br_is_designated_port(p))
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (memcmp(&br->bridge_id, &p->designated_root, 8) <= 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (!root_port)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
rp = br_get_port(br, root_port);
|
|
|
|
|
|
|
|
t = memcmp(&p->designated_root, &rp->designated_root, 8);
|
|
|
|
if (t < 0)
|
|
|
|
return 1;
|
|
|
|
else if (t > 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (p->designated_cost + p->path_cost <
|
|
|
|
rp->designated_cost + rp->path_cost)
|
|
|
|
return 1;
|
|
|
|
else if (p->designated_cost + p->path_cost >
|
|
|
|
rp->designated_cost + rp->path_cost)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
t = memcmp(&p->designated_bridge, &rp->designated_bridge, 8);
|
|
|
|
if (t < 0)
|
|
|
|
return 1;
|
|
|
|
else if (t > 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (p->designated_port < rp->designated_port)
|
|
|
|
return 1;
|
|
|
|
else if (p->designated_port > rp->designated_port)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (p->port_id < rp->port_id)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2012-11-13 08:53:08 +01:00
|
|
|
static void br_root_port_block(const struct net_bridge *br,
|
|
|
|
struct net_bridge_port *p)
|
|
|
|
{
|
|
|
|
|
|
|
|
br_notice(br, "port %u(%s) tried to become root port (blocked)",
|
|
|
|
(unsigned int) p->port_no, p->dev->name);
|
|
|
|
|
2014-10-01 01:13:19 +02:00
|
|
|
br_set_state(p, BR_STATE_LISTENING);
|
2017-11-01 11:18:13 +01:00
|
|
|
br_ifinfo_notify(RTM_NEWLINK, NULL, p);
|
2012-11-13 08:53:08 +01:00
|
|
|
|
|
|
|
if (br->forward_delay > 0)
|
|
|
|
mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
|
|
|
|
}
|
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
/* called under bridge lock */
|
|
|
|
static void br_root_selection(struct net_bridge *br)
|
|
|
|
{
|
|
|
|
struct net_bridge_port *p;
|
|
|
|
u16 root_port = 0;
|
|
|
|
|
|
|
|
list_for_each_entry(p, &br->port_list, list) {
|
2012-11-13 08:53:08 +01:00
|
|
|
if (!br_should_become_root_port(p, root_port))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (p->flags & BR_ROOT_BLOCK)
|
|
|
|
br_root_port_block(br, p);
|
|
|
|
else
|
2005-04-17 00:20:36 +02:00
|
|
|
root_port = p->port_no;
|
|
|
|
}
|
|
|
|
|
|
|
|
br->root_port = root_port;
|
|
|
|
|
|
|
|
if (!root_port) {
|
|
|
|
br->designated_root = br->bridge_id;
|
|
|
|
br->root_path_cost = 0;
|
|
|
|
} else {
|
|
|
|
p = br_get_port(br, root_port);
|
|
|
|
br->designated_root = p->designated_root;
|
|
|
|
br->root_path_cost = p->designated_cost + p->path_cost;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
void br_become_root_bridge(struct net_bridge *br)
|
|
|
|
{
|
|
|
|
br->max_age = br->bridge_max_age;
|
|
|
|
br->hello_time = br->bridge_hello_time;
|
|
|
|
br->forward_delay = br->bridge_forward_delay;
|
|
|
|
br_topology_change_detection(br);
|
|
|
|
del_timer(&br->tcn_timer);
|
|
|
|
|
|
|
|
if (br->dev->flags & IFF_UP) {
|
|
|
|
br_config_bpdu_generation(br);
|
|
|
|
mod_timer(&br->hello_timer, jiffies + br->hello_time);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
void br_transmit_config(struct net_bridge_port *p)
|
|
|
|
{
|
|
|
|
struct br_config_bpdu bpdu;
|
|
|
|
struct net_bridge *br;
|
|
|
|
|
|
|
|
if (timer_pending(&p->hold_timer)) {
|
|
|
|
p->config_pending = 1;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
br = p->br;
|
|
|
|
|
|
|
|
bpdu.topology_change = br->topology_change;
|
|
|
|
bpdu.topology_change_ack = p->topology_change_ack;
|
|
|
|
bpdu.root = br->designated_root;
|
|
|
|
bpdu.root_path_cost = br->root_path_cost;
|
|
|
|
bpdu.bridge_id = br->bridge_id;
|
|
|
|
bpdu.port_id = p->port_id;
|
|
|
|
if (br_is_root_bridge(br))
|
|
|
|
bpdu.message_age = 0;
|
|
|
|
else {
|
|
|
|
struct net_bridge_port *root
|
|
|
|
= br_get_port(br, br->root_port);
|
2011-07-22 09:47:06 +02:00
|
|
|
bpdu.message_age = (jiffies - root->designated_age)
|
2005-04-17 00:20:36 +02:00
|
|
|
+ MESSAGE_AGE_INCR;
|
|
|
|
}
|
|
|
|
bpdu.max_age = br->max_age;
|
|
|
|
bpdu.hello_time = br->hello_time;
|
|
|
|
bpdu.forward_delay = br->forward_delay;
|
|
|
|
|
|
|
|
if (bpdu.message_age < br->max_age) {
|
|
|
|
br_send_config_bpdu(p, &bpdu);
|
|
|
|
p->topology_change_ack = 0;
|
|
|
|
p->config_pending = 0;
|
2015-07-23 20:01:05 +02:00
|
|
|
if (p->br->stp_enabled == BR_KERNEL_STP)
|
|
|
|
mod_timer(&p->hold_timer,
|
|
|
|
round_jiffies(jiffies + BR_HOLD_TIME));
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-07-22 09:47:10 +02:00
|
|
|
static void br_record_config_information(struct net_bridge_port *p,
|
|
|
|
const struct br_config_bpdu *bpdu)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
p->designated_root = bpdu->root;
|
|
|
|
p->designated_cost = bpdu->root_path_cost;
|
|
|
|
p->designated_bridge = bpdu->bridge_id;
|
|
|
|
p->designated_port = bpdu->port_id;
|
2012-03-01 09:12:19 +01:00
|
|
|
p->designated_age = jiffies - bpdu->message_age;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
2007-02-09 15:24:35 +01:00
|
|
|
mod_timer(&p->message_age_timer, jiffies
|
2013-09-12 06:37:47 +02:00
|
|
|
+ (bpdu->max_age - bpdu->message_age));
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-07-22 09:47:10 +02:00
|
|
|
static void br_record_config_timeout_values(struct net_bridge *br,
|
2005-04-17 00:20:36 +02:00
|
|
|
const struct br_config_bpdu *bpdu)
|
|
|
|
{
|
|
|
|
br->max_age = bpdu->max_age;
|
|
|
|
br->hello_time = bpdu->hello_time;
|
|
|
|
br->forward_delay = bpdu->forward_delay;
|
2016-12-10 19:44:28 +01:00
|
|
|
__br_set_topology_change(br, bpdu->topology_change);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
void br_transmit_tcn(struct net_bridge *br)
|
|
|
|
{
|
2013-04-30 07:29:27 +02:00
|
|
|
struct net_bridge_port *p;
|
|
|
|
|
|
|
|
p = br_get_port(br, br->root_port);
|
|
|
|
if (p)
|
|
|
|
br_send_tcn_bpdu(p);
|
|
|
|
else
|
|
|
|
br_notice(br, "root port %u not found for topology notice\n",
|
|
|
|
br->root_port);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
static int br_should_become_designated_port(const struct net_bridge_port *p)
|
|
|
|
{
|
|
|
|
struct net_bridge *br;
|
|
|
|
int t;
|
|
|
|
|
|
|
|
br = p->br;
|
|
|
|
if (br_is_designated_port(p))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
if (memcmp(&p->designated_root, &br->designated_root, 8))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
if (br->root_path_cost < p->designated_cost)
|
|
|
|
return 1;
|
|
|
|
else if (br->root_path_cost > p->designated_cost)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
t = memcmp(&br->bridge_id, &p->designated_bridge, 8);
|
|
|
|
if (t < 0)
|
|
|
|
return 1;
|
|
|
|
else if (t > 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (p->port_id < p->designated_port)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
static void br_designated_port_selection(struct net_bridge *br)
|
|
|
|
{
|
|
|
|
struct net_bridge_port *p;
|
|
|
|
|
|
|
|
list_for_each_entry(p, &br->port_list, list) {
|
|
|
|
if (p->state != BR_STATE_DISABLED &&
|
|
|
|
br_should_become_designated_port(p))
|
|
|
|
br_become_designated_port(p);
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-07-22 09:47:10 +02:00
|
|
|
static int br_supersedes_port_info(const struct net_bridge_port *p,
|
|
|
|
const struct br_config_bpdu *bpdu)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
int t;
|
|
|
|
|
|
|
|
t = memcmp(&bpdu->root, &p->designated_root, 8);
|
|
|
|
if (t < 0)
|
|
|
|
return 1;
|
|
|
|
else if (t > 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (bpdu->root_path_cost < p->designated_cost)
|
|
|
|
return 1;
|
|
|
|
else if (bpdu->root_path_cost > p->designated_cost)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
t = memcmp(&bpdu->bridge_id, &p->designated_bridge, 8);
|
|
|
|
if (t < 0)
|
|
|
|
return 1;
|
|
|
|
else if (t > 0)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
if (memcmp(&bpdu->bridge_id, &p->br->bridge_id, 8))
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
if (bpdu->port_id <= p->designated_port)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-07-22 09:47:10 +02:00
|
|
|
static void br_topology_change_acknowledged(struct net_bridge *br)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
br->topology_change_detected = 0;
|
|
|
|
del_timer(&br->tcn_timer);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
void br_topology_change_detection(struct net_bridge *br)
|
|
|
|
{
|
|
|
|
int isroot = br_is_root_bridge(br);
|
|
|
|
|
2009-05-15 08:11:58 +02:00
|
|
|
if (br->stp_enabled != BR_KERNEL_STP)
|
|
|
|
return;
|
|
|
|
|
2010-05-10 11:31:09 +02:00
|
|
|
br_info(br, "topology change detected, %s\n",
|
2005-04-17 00:20:36 +02:00
|
|
|
isroot ? "propagating" : "sending tcn bpdu");
|
|
|
|
|
|
|
|
if (isroot) {
|
2016-12-10 19:44:28 +01:00
|
|
|
__br_set_topology_change(br, 1);
|
2005-04-17 00:20:36 +02:00
|
|
|
mod_timer(&br->topology_change_timer, jiffies
|
|
|
|
+ br->bridge_forward_delay + br->bridge_max_age);
|
|
|
|
} else if (!br->topology_change_detected) {
|
|
|
|
br_transmit_tcn(br);
|
|
|
|
mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time);
|
|
|
|
}
|
|
|
|
|
|
|
|
br->topology_change_detected = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
void br_config_bpdu_generation(struct net_bridge *br)
|
|
|
|
{
|
|
|
|
struct net_bridge_port *p;
|
|
|
|
|
|
|
|
list_for_each_entry(p, &br->port_list, list) {
|
|
|
|
if (p->state != BR_STATE_DISABLED &&
|
|
|
|
br_is_designated_port(p))
|
|
|
|
br_transmit_config(p);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-07-22 09:47:10 +02:00
|
|
|
static void br_reply(struct net_bridge_port *p)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
br_transmit_config(p);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
void br_configuration_update(struct net_bridge *br)
|
|
|
|
{
|
|
|
|
br_root_selection(br);
|
|
|
|
br_designated_port_selection(br);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
void br_become_designated_port(struct net_bridge_port *p)
|
|
|
|
{
|
|
|
|
struct net_bridge *br;
|
|
|
|
|
|
|
|
br = p->br;
|
|
|
|
p->designated_root = br->designated_root;
|
|
|
|
p->designated_cost = br->root_path_cost;
|
|
|
|
p->designated_bridge = br->bridge_id;
|
|
|
|
p->designated_port = p->port_id;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
static void br_make_blocking(struct net_bridge_port *p)
|
|
|
|
{
|
|
|
|
if (p->state != BR_STATE_DISABLED &&
|
|
|
|
p->state != BR_STATE_BLOCKING) {
|
|
|
|
if (p->state == BR_STATE_FORWARDING ||
|
|
|
|
p->state == BR_STATE_LEARNING)
|
|
|
|
br_topology_change_detection(p->br);
|
|
|
|
|
2014-10-01 01:13:19 +02:00
|
|
|
br_set_state(p, BR_STATE_BLOCKING);
|
2017-11-01 11:18:13 +01:00
|
|
|
br_ifinfo_notify(RTM_NEWLINK, NULL, p);
|
2011-07-22 09:47:09 +02:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
del_timer(&p->forward_delay_timer);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
static void br_make_forwarding(struct net_bridge_port *p)
|
|
|
|
{
|
2008-08-06 03:42:51 +02:00
|
|
|
struct net_bridge *br = p->br;
|
2007-03-21 22:22:44 +01:00
|
|
|
|
2008-08-06 03:42:51 +02:00
|
|
|
if (p->state != BR_STATE_BLOCKING)
|
|
|
|
return;
|
|
|
|
|
2011-03-10 06:57:04 +01:00
|
|
|
if (br->stp_enabled == BR_NO_STP || br->forward_delay == 0) {
|
2014-10-01 01:13:19 +02:00
|
|
|
br_set_state(p, BR_STATE_FORWARDING);
|
2008-08-06 03:42:51 +02:00
|
|
|
br_topology_change_detection(br);
|
|
|
|
del_timer(&p->forward_delay_timer);
|
2011-07-22 09:47:10 +02:00
|
|
|
} else if (br->stp_enabled == BR_KERNEL_STP)
|
2014-10-01 01:13:19 +02:00
|
|
|
br_set_state(p, BR_STATE_LISTENING);
|
2008-08-06 03:42:51 +02:00
|
|
|
else
|
2014-10-01 01:13:19 +02:00
|
|
|
br_set_state(p, BR_STATE_LEARNING);
|
2008-08-06 03:42:51 +02:00
|
|
|
|
2017-11-01 11:18:13 +01:00
|
|
|
br_ifinfo_notify(RTM_NEWLINK, NULL, p);
|
2008-08-06 03:42:51 +02:00
|
|
|
|
|
|
|
if (br->forward_delay != 0)
|
|
|
|
mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
void br_port_state_selection(struct net_bridge *br)
|
|
|
|
{
|
|
|
|
struct net_bridge_port *p;
|
2011-03-07 09:34:06 +01:00
|
|
|
unsigned int liveports = 0;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
list_for_each_entry(p, &br->port_list, list) {
|
2011-03-07 09:34:06 +01:00
|
|
|
if (p->state == BR_STATE_DISABLED)
|
|
|
|
continue;
|
|
|
|
|
2011-11-25 01:16:37 +01:00
|
|
|
/* Don't change port states if userspace is handling STP */
|
|
|
|
if (br->stp_enabled != BR_USER_STP) {
|
|
|
|
if (p->port_no == br->root_port) {
|
|
|
|
p->config_pending = 0;
|
|
|
|
p->topology_change_ack = 0;
|
|
|
|
br_make_forwarding(p);
|
|
|
|
} else if (br_is_designated_port(p)) {
|
|
|
|
del_timer(&p->message_age_timer);
|
|
|
|
br_make_forwarding(p);
|
|
|
|
} else {
|
|
|
|
p->config_pending = 0;
|
|
|
|
p->topology_change_ack = 0;
|
|
|
|
br_make_blocking(p);
|
|
|
|
}
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
2015-06-19 10:45:50 +02:00
|
|
|
if (p->state != BR_STATE_BLOCKING)
|
|
|
|
br_multicast_enable_port(p);
|
2015-06-23 13:47:44 +02:00
|
|
|
/* Multicast is not disabled for the port when it goes in
|
|
|
|
* blocking state because the timers will expire and stop by
|
|
|
|
* themselves without sending more queries.
|
|
|
|
*/
|
2011-03-07 09:34:06 +01:00
|
|
|
if (p->state == BR_STATE_FORWARDING)
|
|
|
|
++liveports;
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
2011-03-07 09:34:06 +01:00
|
|
|
|
|
|
|
if (liveports == 0)
|
|
|
|
netif_carrier_off(br->dev);
|
|
|
|
else
|
|
|
|
netif_carrier_on(br->dev);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-07-22 09:47:10 +02:00
|
|
|
static void br_topology_change_acknowledge(struct net_bridge_port *p)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
p->topology_change_ack = 1;
|
|
|
|
br_transmit_config(p);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-07-22 09:47:10 +02:00
|
|
|
void br_received_config_bpdu(struct net_bridge_port *p,
|
|
|
|
const struct br_config_bpdu *bpdu)
|
2005-04-17 00:20:36 +02:00
|
|
|
{
|
|
|
|
struct net_bridge *br;
|
|
|
|
int was_root;
|
2007-02-09 15:24:35 +01:00
|
|
|
|
2005-04-17 00:20:36 +02:00
|
|
|
br = p->br;
|
|
|
|
was_root = br_is_root_bridge(br);
|
|
|
|
|
|
|
|
if (br_supersedes_port_info(p, bpdu)) {
|
|
|
|
br_record_config_information(p, bpdu);
|
|
|
|
br_configuration_update(br);
|
|
|
|
br_port_state_selection(br);
|
|
|
|
|
|
|
|
if (!br_is_root_bridge(br) && was_root) {
|
|
|
|
del_timer(&br->hello_timer);
|
|
|
|
if (br->topology_change_detected) {
|
|
|
|
del_timer(&br->topology_change_timer);
|
|
|
|
br_transmit_tcn(br);
|
|
|
|
|
2007-02-09 15:24:35 +01:00
|
|
|
mod_timer(&br->tcn_timer,
|
2005-04-17 00:20:36 +02:00
|
|
|
jiffies + br->bridge_hello_time);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (p->port_no == br->root_port) {
|
|
|
|
br_record_config_timeout_values(br, bpdu);
|
|
|
|
br_config_bpdu_generation(br);
|
|
|
|
if (bpdu->topology_change_ack)
|
|
|
|
br_topology_change_acknowledged(br);
|
|
|
|
}
|
2007-02-09 15:24:35 +01:00
|
|
|
} else if (br_is_designated_port(p)) {
|
|
|
|
br_reply(p);
|
2005-04-17 00:20:36 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
|
|
|
void br_received_tcn_bpdu(struct net_bridge_port *p)
|
|
|
|
{
|
|
|
|
if (br_is_designated_port(p)) {
|
2010-05-10 11:31:09 +02:00
|
|
|
br_info(p->br, "port %u(%s) received tcn bpdu\n",
|
2012-04-15 07:58:06 +02:00
|
|
|
(unsigned int) p->port_no, p->dev->name);
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
br_topology_change_detection(p->br);
|
|
|
|
br_topology_change_acknowledge(p);
|
|
|
|
}
|
|
|
|
}
|
2011-04-04 16:03:33 +02:00
|
|
|
|
|
|
|
/* Change bridge STP parameter */
|
|
|
|
int br_set_hello_time(struct net_bridge *br, unsigned long val)
|
|
|
|
{
|
|
|
|
unsigned long t = clock_t_to_jiffies(val);
|
|
|
|
|
|
|
|
if (t < BR_MIN_HELLO_TIME || t > BR_MAX_HELLO_TIME)
|
|
|
|
return -ERANGE;
|
|
|
|
|
|
|
|
spin_lock_bh(&br->lock);
|
|
|
|
br->bridge_hello_time = t;
|
|
|
|
if (br_is_root_bridge(br))
|
|
|
|
br->hello_time = br->bridge_hello_time;
|
|
|
|
spin_unlock_bh(&br->lock);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
int br_set_max_age(struct net_bridge *br, unsigned long val)
|
|
|
|
{
|
|
|
|
unsigned long t = clock_t_to_jiffies(val);
|
|
|
|
|
|
|
|
if (t < BR_MIN_MAX_AGE || t > BR_MAX_MAX_AGE)
|
|
|
|
return -ERANGE;
|
|
|
|
|
|
|
|
spin_lock_bh(&br->lock);
|
|
|
|
br->bridge_max_age = t;
|
|
|
|
if (br_is_root_bridge(br))
|
|
|
|
br->max_age = br->bridge_max_age;
|
|
|
|
spin_unlock_bh(&br->lock);
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2016-12-10 19:44:27 +01:00
|
|
|
/* called under bridge lock */
|
|
|
|
int __set_ageing_time(struct net_device *dev, unsigned long t)
|
|
|
|
{
|
|
|
|
struct switchdev_attr attr = {
|
|
|
|
.orig_dev = dev,
|
|
|
|
.id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
|
|
|
|
.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP | SWITCHDEV_F_DEFER,
|
|
|
|
.u.ageing_time = jiffies_to_clock_t(t),
|
|
|
|
};
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = switchdev_port_attr_set(dev, &attr);
|
|
|
|
if (err && err != -EOPNOTSUPP)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-03-08 21:59:35 +01:00
|
|
|
/* Set time interval that dynamic forwarding entries live
|
|
|
|
* For pure software bridge, allow values outside the 802.1
|
|
|
|
* standard specification for special cases:
|
|
|
|
* 0 - entry never ages (all permanant)
|
|
|
|
* 1 - entry disappears (no persistance)
|
|
|
|
*
|
|
|
|
* Offloaded switch entries maybe more restrictive
|
|
|
|
*/
|
2016-07-21 18:42:19 +02:00
|
|
|
int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time)
|
2015-10-09 04:23:19 +02:00
|
|
|
{
|
|
|
|
unsigned long t = clock_t_to_jiffies(ageing_time);
|
|
|
|
int err;
|
|
|
|
|
2016-12-10 19:44:27 +01:00
|
|
|
err = __set_ageing_time(br->dev, t);
|
|
|
|
if (err)
|
2015-10-09 04:23:19 +02:00
|
|
|
return err;
|
|
|
|
|
2016-12-10 19:44:29 +01:00
|
|
|
spin_lock_bh(&br->lock);
|
|
|
|
br->bridge_ageing_time = t;
|
2015-10-09 04:23:19 +02:00
|
|
|
br->ageing_time = t;
|
2016-12-10 19:44:29 +01:00
|
|
|
spin_unlock_bh(&br->lock);
|
|
|
|
|
2017-02-04 18:05:07 +01:00
|
|
|
mod_delayed_work(system_long_wq, &br->gc_work, 0);
|
2015-10-09 04:23:19 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-12-10 19:44:28 +01:00
|
|
|
/* called under bridge lock */
|
|
|
|
void __br_set_topology_change(struct net_bridge *br, unsigned char val)
|
|
|
|
{
|
2016-12-10 19:44:29 +01:00
|
|
|
unsigned long t;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
if (br->stp_enabled == BR_KERNEL_STP && br->topology_change != val) {
|
|
|
|
/* On topology change, set the bridge ageing time to twice the
|
|
|
|
* forward delay. Otherwise, restore its default ageing time.
|
|
|
|
*/
|
|
|
|
|
|
|
|
if (val) {
|
|
|
|
t = 2 * br->forward_delay;
|
|
|
|
br_debug(br, "decreasing ageing time to %lu\n", t);
|
|
|
|
} else {
|
|
|
|
t = br->bridge_ageing_time;
|
|
|
|
br_debug(br, "restoring ageing time to %lu\n", t);
|
|
|
|
}
|
|
|
|
|
|
|
|
err = __set_ageing_time(br->dev, t);
|
|
|
|
if (err)
|
|
|
|
br_warn(br, "error offloading ageing time\n");
|
|
|
|
else
|
|
|
|
br->ageing_time = t;
|
|
|
|
}
|
|
|
|
|
2016-12-10 19:44:28 +01:00
|
|
|
br->topology_change = val;
|
|
|
|
}
|
|
|
|
|
2013-09-12 09:12:05 +02:00
|
|
|
void __br_set_forward_delay(struct net_bridge *br, unsigned long t)
|
|
|
|
{
|
|
|
|
br->bridge_forward_delay = t;
|
|
|
|
if (br_is_root_bridge(br))
|
|
|
|
br->forward_delay = br->bridge_forward_delay;
|
|
|
|
}
|
|
|
|
|
2011-04-04 16:03:33 +02:00
|
|
|
int br_set_forward_delay(struct net_bridge *br, unsigned long val)
|
|
|
|
{
|
|
|
|
unsigned long t = clock_t_to_jiffies(val);
|
2015-11-10 12:15:32 +01:00
|
|
|
int err = -ERANGE;
|
2011-04-04 16:03:33 +02:00
|
|
|
|
2015-09-24 20:20:11 +02:00
|
|
|
spin_lock_bh(&br->lock);
|
2015-11-10 12:15:32 +01:00
|
|
|
if (br->stp_enabled != BR_NO_STP &&
|
|
|
|
(t < BR_MIN_FORWARD_DELAY || t > BR_MAX_FORWARD_DELAY))
|
|
|
|
goto unlock;
|
|
|
|
|
2013-09-12 09:12:05 +02:00
|
|
|
__br_set_forward_delay(br, t);
|
2015-11-10 12:15:32 +01:00
|
|
|
err = 0;
|
|
|
|
|
|
|
|
unlock:
|
2011-04-04 16:03:33 +02:00
|
|
|
spin_unlock_bh(&br->lock);
|
2015-11-10 12:15:32 +01:00
|
|
|
return err;
|
2011-04-04 16:03:33 +02:00
|
|
|
}
|