diff options
Diffstat (limited to 'net/bridge/br_stp_timer.c')
| -rw-r--r-- | net/bridge/br_stp_timer.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/net/bridge/br_stp_timer.c b/net/bridge/br_stp_timer.c new file mode 100644 index 000000000..ca4e6e568 --- /dev/null +++ b/net/bridge/br_stp_timer.c @@ -0,0 +1,184 @@ +/* + * Spanning tree protocol; timer-related code + * Linux ethernet bridge + * + * Authors: + * Lennert Buytenhek <buytenh@gnu.org> + * + * $Id: br_stp_timer.c,v 1.1 2000/02/18 16:47:13 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" + +static void dump_bridge_id(bridge_id *id) +{ + printk("%.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x", id->prio[0], + id->prio[1], id->addr[0], id->addr[1], id->addr[2], id->addr[3], + id->addr[4], id->addr[5]); +} + +/* called under bridge lock */ +static int br_is_designated_for_some_port(struct net_bridge *br) +{ + struct net_bridge_port *p; + + p = br->port_list; + while (p != NULL) { + if (p->state != BR_STATE_DISABLED && + !memcmp(&p->designated_bridge, &br->bridge_id, 8)) + return 1; + + p = p->next; + } + + return 0; +} + +/* called under bridge lock */ +static void br_hello_timer_expired(struct net_bridge *br) +{ + br_config_bpdu_generation(br); + br_timer_set(&br->hello_timer, jiffies); +} + +/* called under bridge lock */ +static void br_message_age_timer_expired(struct net_bridge_port *p) +{ + struct net_bridge *br; + int was_root; + + br = p->br; + printk(KERN_INFO "%s: ", br->name); + printk("neighbour "); + dump_bridge_id(&p->designated_bridge); + printk(" lost on port %i(%s)\n", p->port_no, p->dev->name); + + /* + * According to the spec, the message age timer cannot be + * running when we are the root bridge. So.. this was_root + * check is redundant. I'm leaving it in for now, though. + */ + was_root = br_is_root_bridge(br); + + br_become_designated_port(p); + br_configuration_update(br); + br_port_state_selection(br); + if (br_is_root_bridge(br) && !was_root) + br_become_root_bridge(br); +} + +/* called under bridge lock */ +static void br_forward_delay_timer_expired(struct net_bridge_port *p) +{ + if (p->state == BR_STATE_LISTENING) { + printk(KERN_INFO "%s: port %i(%s) entering %s state\n", + p->br->name, p->port_no, p->dev->name, "learning"); + + p->state = BR_STATE_LEARNING; + br_timer_set(&p->forward_delay_timer, jiffies); + } else if (p->state == BR_STATE_LEARNING) { + printk(KERN_INFO "%s: port %i(%s) entering %s state\n", + p->br->name, p->port_no, p->dev->name, "forwarding"); + + p->state = BR_STATE_FORWARDING; + if (br_is_designated_for_some_port(p->br)) + br_topology_change_detection(p->br); + } +} + +/* called under bridge lock */ +static void br_tcn_timer_expired(struct net_bridge *br) +{ + printk(KERN_INFO "%s: retransmitting tcn bpdu\n", br->name); + br_transmit_tcn(br); + br_timer_set(&br->tcn_timer, jiffies); +} + +/* called under bridge lock */ +static void br_topology_change_timer_expired(struct net_bridge *br) +{ + br->topology_change_detected = 0; + br->topology_change = 0; +} + +/* called under bridge lock */ +static void br_hold_timer_expired(struct net_bridge_port *p) +{ + if (p->config_pending) + br_transmit_config(p); +} + +/* called under bridge lock */ +static void br_check_port_timers(struct net_bridge_port *p) +{ + if (br_timer_has_expired(&p->message_age_timer, p->br->max_age)) { + br_timer_clear(&p->message_age_timer); + br_message_age_timer_expired(p); + } + + if (br_timer_has_expired(&p->forward_delay_timer, p->br->forward_delay)) { + br_timer_clear(&p->forward_delay_timer); + br_forward_delay_timer_expired(p); + } + + if (br_timer_has_expired(&p->hold_timer, BR_HOLD_TIME)) { + br_timer_clear(&p->hold_timer); + br_hold_timer_expired(p); + } +} + +/* called under bridge lock */ +static void br_check_timers(struct net_bridge *br) +{ + struct net_bridge_port *p; + + if (br_timer_has_expired(&br->gc_timer, br->gc_interval)) { + br_timer_set(&br->gc_timer, jiffies); + br_fdb_cleanup(br); + } + + if (br_timer_has_expired(&br->hello_timer, br->hello_time)) { + br_timer_clear(&br->hello_timer); + br_hello_timer_expired(br); + } + + if (br_timer_has_expired(&br->tcn_timer, br->bridge_hello_time)) { + br_timer_clear(&br->tcn_timer); + br_tcn_timer_expired(br); + } + + if (br_timer_has_expired(&br->topology_change_timer, br->bridge_forward_delay + br->bridge_max_age)) { + br_timer_clear(&br->topology_change_timer); + br_topology_change_timer_expired(br); + } + + p = br->port_list; + while (p != NULL) { + if (p->state != BR_STATE_DISABLED) + br_check_port_timers(p); + + p = p->next; + } +} + +void br_tick(unsigned long __data) +{ + struct net_bridge *br = (struct net_bridge *)__data; + + read_lock(&br->lock); + br_check_timers(br); + read_unlock(&br->lock); + + br->tick.expires = jiffies + 1; + add_timer(&br->tick); +} |