2005-04-16 22:20:36 +00:00
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/*
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* Spanning tree protocol; interface code
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* Linux ethernet bridge
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*
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* Authors:
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* Lennert Buytenhek <buytenh@gnu.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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2011-08-29 21:55:05 +00:00
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#include <linux/kmod.h>
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2005-10-25 22:04:59 +00:00
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#include <linux/etherdevice.h>
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2006-05-25 23:00:12 +00:00
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#include <linux/rtnetlink.h>
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2015-10-19 12:37:25 +00:00
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#include <net/switchdev.h>
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2005-04-16 22:20:36 +00:00
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#include "br_private.h"
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#include "br_private_stp.h"
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/* Port id is composed of priority and port number.
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2011-04-04 14:03:33 +00:00
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* NB: some bits of priority are dropped to
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2005-04-16 22:20:36 +00:00
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* make room for more ports.
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*/
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static inline port_id br_make_port_id(__u8 priority, __u16 port_no)
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{
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2007-02-09 14:24:35 +00:00
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return ((u16)priority << BR_PORT_BITS)
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2005-04-16 22:20:36 +00:00
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}
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2011-04-04 14:03:33 +00:00
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#define BR_MAX_PORT_PRIORITY ((u16)~0 >> BR_PORT_BITS)
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2005-04-16 22:20:36 +00:00
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/* called under bridge lock */
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void br_init_port(struct net_bridge_port *p)
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{
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2015-10-19 12:37:25 +00:00
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struct switchdev_attr attr = {
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2015-12-15 15:03:35 +00:00
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.orig_dev = p->dev,
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2015-10-19 12:37:25 +00:00
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.id = SWITCHDEV_ATTR_ID_BRIDGE_AGEING_TIME,
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.flags = SWITCHDEV_F_SKIP_EOPNOTSUPP | SWITCHDEV_F_DEFER,
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2015-12-21 08:56:01 +00:00
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.u.ageing_time = jiffies_to_clock_t(p->br->ageing_time),
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2015-10-19 12:37:25 +00:00
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};
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int err;
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2005-04-16 22:20:36 +00:00
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p->port_id = br_make_port_id(p->priority, p->port_no);
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br_become_designated_port(p);
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2014-09-30 23:13:19 +00:00
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br_set_state(p, BR_STATE_BLOCKING);
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2005-04-16 22:20:36 +00:00
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p->topology_change_ack = 0;
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p->config_pending = 0;
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2015-10-19 12:37:25 +00:00
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err = switchdev_port_attr_set(p->dev, &attr);
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2015-11-13 11:06:12 +00:00
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if (err && err != -EOPNOTSUPP)
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2015-10-19 12:37:25 +00:00
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netdev_err(p->dev, "failed to set HW ageing time\n");
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2005-04-16 22:20:36 +00:00
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}
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/* called under bridge lock */
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void br_stp_enable_bridge(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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spin_lock_bh(&br->lock);
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2015-07-23 18:01:05 +00:00
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if (br->stp_enabled == BR_KERNEL_STP)
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mod_timer(&br->hello_timer, jiffies + br->hello_time);
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2005-04-16 22:20:36 +00:00
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mod_timer(&br->gc_timer, jiffies + HZ/10);
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2007-02-09 14:24:35 +00:00
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2005-04-16 22:20:36 +00:00
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br_config_bpdu_generation(br);
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list_for_each_entry(p, &br->port_list, list) {
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2012-12-28 18:15:22 +00:00
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if (netif_running(p->dev) && netif_oper_up(p->dev))
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2005-04-16 22:20:36 +00:00
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br_stp_enable_port(p);
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}
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spin_unlock_bh(&br->lock);
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}
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/* NO locks held */
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void br_stp_disable_bridge(struct net_bridge *br)
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{
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struct net_bridge_port *p;
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2006-02-15 09:47:48 +00:00
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spin_lock_bh(&br->lock);
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2005-04-16 22:20:36 +00:00
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list_for_each_entry(p, &br->port_list, list) {
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if (p->state != BR_STATE_DISABLED)
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br_stp_disable_port(p);
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}
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br->topology_change = 0;
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br->topology_change_detected = 0;
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2006-02-15 09:47:48 +00:00
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spin_unlock_bh(&br->lock);
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2005-04-16 22:20:36 +00:00
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del_timer_sync(&br->hello_timer);
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del_timer_sync(&br->topology_change_timer);
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del_timer_sync(&br->tcn_timer);
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del_timer_sync(&br->gc_timer);
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}
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/* called under bridge lock */
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void br_stp_enable_port(struct net_bridge_port *p)
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{
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br_init_port(p);
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br_port_state_selection(p->br);
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2011-07-22 07:47:09 +00:00
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br_ifinfo_notify(RTM_NEWLINK, p);
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2005-04-16 22:20:36 +00:00
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}
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/* called under bridge lock */
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void br_stp_disable_port(struct net_bridge_port *p)
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{
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2010-05-10 09:31:09 +00:00
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struct net_bridge *br = p->br;
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2005-04-16 22:20:36 +00:00
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int wasroot;
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wasroot = br_is_root_bridge(br);
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br_become_designated_port(p);
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2014-09-30 23:13:19 +00:00
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br_set_state(p, BR_STATE_DISABLED);
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2005-04-16 22:20:36 +00:00
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p->topology_change_ack = 0;
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p->config_pending = 0;
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2011-07-22 07:47:09 +00:00
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br_ifinfo_notify(RTM_NEWLINK, p);
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2005-04-16 22:20:36 +00:00
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del_timer(&p->message_age_timer);
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del_timer(&p->forward_delay_timer);
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del_timer(&p->hold_timer);
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2015-06-23 12:28:16 +00:00
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br_fdb_delete_by_port(br, p, 0, 0);
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2010-02-28 08:49:38 +00:00
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br_multicast_disable_port(p);
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2006-10-12 21:45:38 +00:00
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2005-04-16 22:20:36 +00:00
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br_configuration_update(br);
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br_port_state_selection(br);
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if (br_is_root_bridge(br) && !wasroot)
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br_become_root_bridge(br);
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}
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2007-03-21 21:22:44 +00:00
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static void br_stp_start(struct net_bridge *br)
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{
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int r;
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char *argv[] = { BR_STP_PROG, br->dev->name, "start", NULL };
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char *envp[] = { NULL };
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2015-07-23 18:01:05 +00:00
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struct net_bridge_port *p;
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2007-03-21 21:22:44 +00:00
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2016-01-05 09:46:00 +00:00
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if (net_eq(dev_net(br->dev), &init_net))
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r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
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else
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r = -ENOENT;
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2013-09-12 07:12:05 +00:00
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spin_lock_bh(&br->lock);
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if (br->bridge_forward_delay < BR_MIN_FORWARD_DELAY)
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__br_set_forward_delay(br, BR_MIN_FORWARD_DELAY);
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2013-10-15 18:57:45 +00:00
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else if (br->bridge_forward_delay > BR_MAX_FORWARD_DELAY)
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2013-09-12 07:12:05 +00:00
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__br_set_forward_delay(br, BR_MAX_FORWARD_DELAY);
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2007-03-21 21:22:44 +00:00
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if (r == 0) {
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br->stp_enabled = BR_USER_STP;
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2010-05-10 09:31:09 +00:00
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br_debug(br, "userspace STP started\n");
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2015-07-23 18:01:05 +00:00
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/* Stop hello and hold timers */
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del_timer(&br->hello_timer);
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list_for_each_entry(p, &br->port_list, list)
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del_timer(&p->hold_timer);
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2007-03-21 21:22:44 +00:00
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} else {
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br->stp_enabled = BR_KERNEL_STP;
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2010-05-10 09:31:09 +00:00
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br_debug(br, "using kernel STP\n");
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2007-03-21 21:22:44 +00:00
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/* To start timers on any ports left in blocking */
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br_port_state_selection(br);
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}
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2013-09-12 07:12:05 +00:00
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spin_unlock_bh(&br->lock);
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2007-03-21 21:22:44 +00:00
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}
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static void br_stp_stop(struct net_bridge *br)
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{
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int r;
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char *argv[] = { BR_STP_PROG, br->dev->name, "stop", NULL };
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char *envp[] = { NULL };
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2015-07-23 18:01:05 +00:00
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struct net_bridge_port *p;
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2007-03-21 21:22:44 +00:00
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if (br->stp_enabled == BR_USER_STP) {
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2011-01-03 11:08:58 +00:00
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r = call_usermodehelper(BR_STP_PROG, argv, envp, UMH_WAIT_PROC);
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2010-05-10 09:31:09 +00:00
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br_info(br, "userspace STP stopped, return code %d\n", r);
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2007-03-21 21:22:44 +00:00
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/* To start timers on any ports left in blocking */
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2015-07-23 18:01:05 +00:00
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mod_timer(&br->hello_timer, jiffies + br->hello_time);
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list_for_each_entry(p, &br->port_list, list)
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mod_timer(&p->hold_timer,
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round_jiffies(jiffies + BR_HOLD_TIME));
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2007-03-21 21:22:44 +00:00
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spin_lock_bh(&br->lock);
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br_port_state_selection(br);
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spin_unlock_bh(&br->lock);
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}
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br->stp_enabled = BR_NO_STP;
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}
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void br_stp_set_enabled(struct net_bridge *br, unsigned long val)
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{
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ASSERT_RTNL();
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if (val) {
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if (br->stp_enabled == BR_NO_STP)
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br_stp_start(br);
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} else {
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if (br->stp_enabled != BR_NO_STP)
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br_stp_stop(br);
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}
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}
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2005-04-16 22:20:36 +00:00
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/* called under bridge lock */
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2005-12-22 02:51:49 +00:00
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void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *addr)
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2005-04-16 22:20:36 +00:00
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{
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bridge: Convert compare_ether_addr to ether_addr_equal
Use the new bool function ether_addr_equal to add
some clarity and reduce the likelihood for misuse
of compare_ether_addr for sorting.
Done via cocci script:
$ cat compare_ether_addr.cocci
@@
expression a,b;
@@
- !compare_ether_addr(a, b)
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- compare_ether_addr(a, b)
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) == 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) != 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) == 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) != 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !!ether_addr_equal(a, b)
+ ether_addr_equal(a, b)
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-08 18:56:49 +00:00
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/* should be aligned on 2 bytes for ether_addr_equal() */
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2007-04-17 19:31:24 +00:00
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unsigned short oldaddr_aligned[ETH_ALEN >> 1];
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unsigned char *oldaddr = (unsigned char *)oldaddr_aligned;
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2005-04-16 22:20:36 +00:00
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struct net_bridge_port *p;
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int wasroot;
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wasroot = br_is_root_bridge(br);
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2014-02-07 07:48:21 +00:00
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br_fdb_change_mac_address(br, addr);
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2005-04-16 22:20:36 +00:00
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memcpy(oldaddr, br->bridge_id.addr, ETH_ALEN);
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memcpy(br->bridge_id.addr, addr, ETH_ALEN);
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memcpy(br->dev->dev_addr, addr, ETH_ALEN);
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list_for_each_entry(p, &br->port_list, list) {
|
bridge: Convert compare_ether_addr to ether_addr_equal
Use the new bool function ether_addr_equal to add
some clarity and reduce the likelihood for misuse
of compare_ether_addr for sorting.
Done via cocci script:
$ cat compare_ether_addr.cocci
@@
expression a,b;
@@
- !compare_ether_addr(a, b)
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- compare_ether_addr(a, b)
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) == 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) != 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) == 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) != 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !!ether_addr_equal(a, b)
+ ether_addr_equal(a, b)
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-08 18:56:49 +00:00
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if (ether_addr_equal(p->designated_bridge.addr, oldaddr))
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2005-04-16 22:20:36 +00:00
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memcpy(p->designated_bridge.addr, addr, ETH_ALEN);
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|
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|
bridge: Convert compare_ether_addr to ether_addr_equal
Use the new bool function ether_addr_equal to add
some clarity and reduce the likelihood for misuse
of compare_ether_addr for sorting.
Done via cocci script:
$ cat compare_ether_addr.cocci
@@
expression a,b;
@@
- !compare_ether_addr(a, b)
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- compare_ether_addr(a, b)
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) == 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) != 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) == 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) != 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !!ether_addr_equal(a, b)
+ ether_addr_equal(a, b)
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-08 18:56:49 +00:00
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if (ether_addr_equal(p->designated_root.addr, oldaddr))
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2005-04-16 22:20:36 +00:00
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memcpy(p->designated_root.addr, addr, ETH_ALEN);
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}
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br_configuration_update(br);
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br_port_state_selection(br);
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if (br_is_root_bridge(br) && !wasroot)
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br_become_root_bridge(br);
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}
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|
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|
|
bridge: Convert compare_ether_addr to ether_addr_equal
Use the new bool function ether_addr_equal to add
some clarity and reduce the likelihood for misuse
of compare_ether_addr for sorting.
Done via cocci script:
$ cat compare_ether_addr.cocci
@@
expression a,b;
@@
- !compare_ether_addr(a, b)
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- compare_ether_addr(a, b)
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) == 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) != 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) == 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) != 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !!ether_addr_equal(a, b)
+ ether_addr_equal(a, b)
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-08 18:56:49 +00:00
|
|
|
/* should be aligned on 2 bytes for ether_addr_equal() */
|
2007-04-17 19:31:24 +00:00
|
|
|
static const unsigned short br_mac_zero_aligned[ETH_ALEN >> 1];
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-03-24 13:24:01 +00:00
|
|
|
bool br_stp_recalculate_bridge_id(struct net_bridge *br)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2007-04-17 19:31:24 +00:00
|
|
|
const unsigned char *br_mac_zero =
|
|
|
|
(const unsigned char *)br_mac_zero_aligned;
|
2005-04-16 22:20:36 +00:00
|
|
|
const unsigned char *addr = br_mac_zero;
|
|
|
|
struct net_bridge_port *p;
|
|
|
|
|
2008-06-17 23:10:06 +00:00
|
|
|
/* user has chosen a value so keep it */
|
2013-02-10 11:41:01 +00:00
|
|
|
if (br->dev->addr_assign_type == NET_ADDR_SET)
|
2011-03-29 06:20:04 +00:00
|
|
|
return false;
|
2008-06-17 23:10:06 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
list_for_each_entry(p, &br->port_list, list) {
|
|
|
|
if (addr == br_mac_zero ||
|
2006-01-03 22:35:54 +00:00
|
|
|
memcmp(p->dev->dev_addr, addr, ETH_ALEN) < 0)
|
2005-04-16 22:20:36 +00:00
|
|
|
addr = p->dev->dev_addr;
|
|
|
|
|
|
|
|
}
|
|
|
|
|
bridge: Convert compare_ether_addr to ether_addr_equal
Use the new bool function ether_addr_equal to add
some clarity and reduce the likelihood for misuse
of compare_ether_addr for sorting.
Done via cocci script:
$ cat compare_ether_addr.cocci
@@
expression a,b;
@@
- !compare_ether_addr(a, b)
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- compare_ether_addr(a, b)
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) == 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !ether_addr_equal(a, b) != 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) == 0
+ !ether_addr_equal(a, b)
@@
expression a,b;
@@
- ether_addr_equal(a, b) != 0
+ ether_addr_equal(a, b)
@@
expression a,b;
@@
- !!ether_addr_equal(a, b)
+ ether_addr_equal(a, b)
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-08 18:56:49 +00:00
|
|
|
if (ether_addr_equal(br->bridge_id.addr, addr))
|
2011-03-24 13:24:01 +00:00
|
|
|
return false; /* no change */
|
|
|
|
|
|
|
|
br_stp_change_bridge_id(br, addr);
|
|
|
|
return true;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
2015-06-15 17:28:51 +00:00
|
|
|
/* Acquires and releases bridge lock */
|
2005-04-16 22:20:36 +00:00
|
|
|
void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio)
|
|
|
|
{
|
|
|
|
struct net_bridge_port *p;
|
|
|
|
int wasroot;
|
|
|
|
|
2015-06-15 17:28:51 +00:00
|
|
|
spin_lock_bh(&br->lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
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);
|
2015-06-15 17:28:51 +00:00
|
|
|
spin_unlock_bh(&br->lock);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-04-04 14:03:33 +00:00
|
|
|
int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2011-04-04 14:03:33 +00:00
|
|
|
port_id new_port_id;
|
|
|
|
|
|
|
|
if (newprio > BR_MAX_PORT_PRIORITY)
|
|
|
|
return -ERANGE;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2011-04-04 14:03:33 +00:00
|
|
|
new_port_id = br_make_port_id(newprio, p->port_no);
|
2005-04-16 22:20:36 +00:00
|
|
|
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);
|
|
|
|
}
|
2011-04-04 14:03:33 +00:00
|
|
|
|
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* called under bridge lock */
|
2011-04-04 14:03:33 +00:00
|
|
|
int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2011-04-04 14:03:33 +00:00
|
|
|
if (path_cost < BR_MIN_PATH_COST ||
|
|
|
|
path_cost > BR_MAX_PATH_COST)
|
|
|
|
return -ERANGE;
|
|
|
|
|
2013-04-13 14:06:07 +00:00
|
|
|
p->flags |= BR_ADMIN_COST;
|
2005-04-16 22:20:36 +00:00
|
|
|
p->path_cost = path_cost;
|
|
|
|
br_configuration_update(p->br);
|
|
|
|
br_port_state_selection(p->br);
|
2011-04-04 14:03:33 +00:00
|
|
|
return 0;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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]);
|
|
|
|
}
|