/* * Spanning tree protocol; timer-related code * 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> #include <linux/times.h> #include "br_private.h" #include "br_private_stp.h" /* called under bridge lock */ static int br_is_designated_for_some_port(const struct net_bridge *br) { struct net_bridge_port *p; list_for_each_entry(p, &br->port_list, list) { if (p->state != BR_STATE_DISABLED && !memcmp(&p->designated_bridge, &br->bridge_id, 8)) return 1; } return 0; } static void br_hello_timer_expired(unsigned long arg) { struct net_bridge *br = (struct net_bridge *)arg; br_debug(br, "hello timer expired\n"); spin_lock(&br->lock); if (br->dev->flags & IFF_UP) { br_config_bpdu_generation(br); if (br->stp_enabled != BR_USER_STP) mod_timer(&br->hello_timer, round_jiffies(jiffies + br->hello_time)); } spin_unlock(&br->lock); } static void br_message_age_timer_expired(unsigned long arg) { struct net_bridge_port *p = (struct net_bridge_port *) arg; struct net_bridge *br = p->br; const bridge_id *id = &p->designated_bridge; int was_root; if (p->state == BR_STATE_DISABLED) return; br_info(br, "port %u(%s) neighbor %.2x%.2x.%pM lost\n", (unsigned int) p->port_no, p->dev->name, id->prio[0], id->prio[1], &id->addr); /* * 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. */ spin_lock(&br->lock); if (p->state == BR_STATE_DISABLED) goto unlock; 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); unlock: spin_unlock(&br->lock); } static void br_forward_delay_timer_expired(unsigned long arg) { struct net_bridge_port *p = (struct net_bridge_port *) arg; struct net_bridge *br = p->br; br_debug(br, "port %u(%s) forward delay timer\n", (unsigned int) p->port_no, p->dev->name); spin_lock(&br->lock); if (p->state == BR_STATE_LISTENING) { br_set_state(p, BR_STATE_LEARNING); mod_timer(&p->forward_delay_timer, jiffies + br->forward_delay); } else if (p->state == BR_STATE_LEARNING) { br_set_state(p, BR_STATE_FORWARDING); if (br_is_designated_for_some_port(br)) br_topology_change_detection(br); netif_carrier_on(br->dev); } br_log_state(p); rcu_read_lock(); br_ifinfo_notify(RTM_NEWLINK, p); rcu_read_unlock(); spin_unlock(&br->lock); } static void br_tcn_timer_expired(unsigned long arg) { struct net_bridge *br = (struct net_bridge *) arg; br_debug(br, "tcn timer expired\n"); spin_lock(&br->lock); if (!br_is_root_bridge(br) && (br->dev->flags & IFF_UP)) { br_transmit_tcn(br); mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time); } spin_unlock(&br->lock); } static void br_topology_change_timer_expired(unsigned long arg) { struct net_bridge *br = (struct net_bridge *) arg; br_debug(br, "topo change timer expired\n"); spin_lock(&br->lock); br->topology_change_detected = 0; br->topology_change = 0; spin_unlock(&br->lock); } static void br_hold_timer_expired(unsigned long arg) { struct net_bridge_port *p = (struct net_bridge_port *) arg; br_debug(p->br, "port %u(%s) hold timer expired\n", (unsigned int) p->port_no, p->dev->name); spin_lock(&p->br->lock); if (p->config_pending) br_transmit_config(p); spin_unlock(&p->br->lock); } void br_stp_timer_init(struct net_bridge *br) { setup_timer(&br->hello_timer, br_hello_timer_expired, (unsigned long) br); setup_timer(&br->tcn_timer, br_tcn_timer_expired, (unsigned long) br); setup_timer(&br->topology_change_timer, br_topology_change_timer_expired, (unsigned long) br); setup_timer(&br->gc_timer, br_fdb_cleanup, (unsigned long) br); } void br_stp_port_timer_init(struct net_bridge_port *p) { setup_timer(&p->message_age_timer, br_message_age_timer_expired, (unsigned long) p); setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired, (unsigned long) p); setup_timer(&p->hold_timer, br_hold_timer_expired, (unsigned long) p); } /* Report ticks left (in USER_HZ) used for API */ unsigned long br_timer_value(const struct timer_list *timer) { return timer_pending(timer) ? jiffies_delta_to_clock_t(timer->expires - jiffies) : 0; }