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161 lines
4.2 KiB
161 lines
4.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Spanning tree protocol; timer-related code |
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* Linux ethernet bridge |
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* |
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* Authors: |
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* Lennert Buytenhek <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/times.h> |
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#include "br_private.h" |
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#include "br_private_stp.h" |
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/* called under bridge lock */ |
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static int br_is_designated_for_some_port(const struct net_bridge *br) |
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{ |
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struct net_bridge_port *p; |
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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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!memcmp(&p->designated_bridge, &br->bridge_id, 8)) |
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return 1; |
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} |
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return 0; |
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} |
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static void br_hello_timer_expired(struct timer_list *t) |
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{ |
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struct net_bridge *br = from_timer(br, t, hello_timer); |
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br_debug(br, "hello timer expired\n"); |
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spin_lock(&br->lock); |
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if (br->dev->flags & IFF_UP) { |
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br_config_bpdu_generation(br); |
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if (br->stp_enabled == BR_KERNEL_STP) |
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mod_timer(&br->hello_timer, |
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round_jiffies(jiffies + br->hello_time)); |
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} |
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spin_unlock(&br->lock); |
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} |
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static void br_message_age_timer_expired(struct timer_list *t) |
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{ |
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struct net_bridge_port *p = from_timer(p, t, message_age_timer); |
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struct net_bridge *br = p->br; |
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const bridge_id *id = &p->designated_bridge; |
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int was_root; |
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if (p->state == BR_STATE_DISABLED) |
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return; |
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br_info(br, "port %u(%s) neighbor %.2x%.2x.%pM lost\n", |
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(unsigned int) p->port_no, p->dev->name, |
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id->prio[0], id->prio[1], &id->addr); |
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/* |
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* According to the spec, the message age timer cannot be |
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* running when we are the root bridge. So.. this was_root |
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* check is redundant. I'm leaving it in for now, though. |
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*/ |
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spin_lock(&br->lock); |
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if (p->state == BR_STATE_DISABLED) |
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goto unlock; |
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was_root = br_is_root_bridge(br); |
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br_become_designated_port(p); |
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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) && !was_root) |
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br_become_root_bridge(br); |
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unlock: |
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spin_unlock(&br->lock); |
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} |
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static void br_forward_delay_timer_expired(struct timer_list *t) |
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{ |
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struct net_bridge_port *p = from_timer(p, t, forward_delay_timer); |
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struct net_bridge *br = p->br; |
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br_debug(br, "port %u(%s) forward delay timer\n", |
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(unsigned int) p->port_no, p->dev->name); |
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spin_lock(&br->lock); |
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if (p->state == BR_STATE_LISTENING) { |
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br_set_state(p, BR_STATE_LEARNING); |
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mod_timer(&p->forward_delay_timer, |
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jiffies + br->forward_delay); |
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} else if (p->state == BR_STATE_LEARNING) { |
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br_set_state(p, BR_STATE_FORWARDING); |
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if (br_is_designated_for_some_port(br)) |
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br_topology_change_detection(br); |
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netif_carrier_on(br->dev); |
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} |
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rcu_read_lock(); |
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br_ifinfo_notify(RTM_NEWLINK, NULL, p); |
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rcu_read_unlock(); |
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spin_unlock(&br->lock); |
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} |
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static void br_tcn_timer_expired(struct timer_list *t) |
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{ |
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struct net_bridge *br = from_timer(br, t, tcn_timer); |
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br_debug(br, "tcn timer expired\n"); |
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spin_lock(&br->lock); |
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if (!br_is_root_bridge(br) && (br->dev->flags & IFF_UP)) { |
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br_transmit_tcn(br); |
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mod_timer(&br->tcn_timer, jiffies + br->bridge_hello_time); |
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} |
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spin_unlock(&br->lock); |
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} |
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static void br_topology_change_timer_expired(struct timer_list *t) |
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{ |
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struct net_bridge *br = from_timer(br, t, topology_change_timer); |
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br_debug(br, "topo change timer expired\n"); |
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spin_lock(&br->lock); |
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br->topology_change_detected = 0; |
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__br_set_topology_change(br, 0); |
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spin_unlock(&br->lock); |
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} |
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static void br_hold_timer_expired(struct timer_list *t) |
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{ |
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struct net_bridge_port *p = from_timer(p, t, hold_timer); |
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br_debug(p->br, "port %u(%s) hold timer expired\n", |
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(unsigned int) p->port_no, p->dev->name); |
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spin_lock(&p->br->lock); |
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if (p->config_pending) |
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br_transmit_config(p); |
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spin_unlock(&p->br->lock); |
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} |
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void br_stp_timer_init(struct net_bridge *br) |
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{ |
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timer_setup(&br->hello_timer, br_hello_timer_expired, 0); |
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timer_setup(&br->tcn_timer, br_tcn_timer_expired, 0); |
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timer_setup(&br->topology_change_timer, |
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br_topology_change_timer_expired, 0); |
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} |
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void br_stp_port_timer_init(struct net_bridge_port *p) |
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{ |
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timer_setup(&p->message_age_timer, br_message_age_timer_expired, 0); |
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timer_setup(&p->forward_delay_timer, br_forward_delay_timer_expired, 0); |
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timer_setup(&p->hold_timer, br_hold_timer_expired, 0); |
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} |
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/* Report ticks left (in USER_HZ) used for API */ |
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unsigned long br_timer_value(const struct timer_list *timer) |
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{ |
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return timer_pending(timer) |
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? jiffies_delta_to_clock_t(timer->expires - jiffies) : 0; |
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}
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