Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Spanning tree protocol; timer-related code |
| 3 | * Linux ethernet bridge |
| 4 | * |
| 5 | * Authors: |
| 6 | * Lennert Buytenhek <buytenh@gnu.org> |
| 7 | * |
| 8 | * $Id: br_stp_timer.c,v 1.3 2000/05/05 02:17:17 davem Exp $ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/times.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #include "br_private.h" |
| 20 | #include "br_private_stp.h" |
| 21 | |
| 22 | /* called under bridge lock */ |
| 23 | static int br_is_designated_for_some_port(const struct net_bridge *br) |
| 24 | { |
| 25 | struct net_bridge_port *p; |
| 26 | |
| 27 | list_for_each_entry(p, &br->port_list, list) { |
| 28 | if (p->state != BR_STATE_DISABLED && |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 29 | !memcmp(&p->designated_bridge, &br->bridge_id, 8)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | return 1; |
| 31 | } |
| 32 | |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | static void br_hello_timer_expired(unsigned long arg) |
| 37 | { |
| 38 | struct net_bridge *br = (struct net_bridge *)arg; |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | pr_debug("%s: hello timer expired\n", br->dev->name); |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 41 | spin_lock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | if (br->dev->flags & IFF_UP) { |
| 43 | br_config_bpdu_generation(br); |
| 44 | |
Stephen Hemminger | 9a834b8 | 2007-05-31 01:21:39 -0700 | [diff] [blame^] | 45 | mod_timer(&br->hello_timer, round_jiffies(jiffies + br->hello_time)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | } |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 47 | spin_unlock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | } |
| 49 | |
| 50 | static void br_message_age_timer_expired(unsigned long arg) |
| 51 | { |
| 52 | struct net_bridge_port *p = (struct net_bridge_port *) arg; |
| 53 | struct net_bridge *br = p->br; |
| 54 | const bridge_id *id = &p->designated_bridge; |
| 55 | int was_root; |
| 56 | |
| 57 | if (p->state == BR_STATE_DISABLED) |
| 58 | return; |
| 59 | |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | pr_info("%s: neighbor %.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x lost on port %d(%s)\n", |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 62 | br->dev->name, |
| 63 | id->prio[0], id->prio[1], |
| 64 | id->addr[0], id->addr[1], id->addr[2], |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | id->addr[3], id->addr[4], id->addr[5], |
| 66 | p->port_no, p->dev->name); |
| 67 | |
| 68 | /* |
| 69 | * According to the spec, the message age timer cannot be |
| 70 | * running when we are the root bridge. So.. this was_root |
| 71 | * check is redundant. I'm leaving it in for now, though. |
| 72 | */ |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 73 | spin_lock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | if (p->state == BR_STATE_DISABLED) |
| 75 | goto unlock; |
| 76 | was_root = br_is_root_bridge(br); |
| 77 | |
| 78 | br_become_designated_port(p); |
| 79 | br_configuration_update(br); |
| 80 | br_port_state_selection(br); |
| 81 | if (br_is_root_bridge(br) && !was_root) |
| 82 | br_become_root_bridge(br); |
| 83 | unlock: |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 84 | spin_unlock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static void br_forward_delay_timer_expired(unsigned long arg) |
| 88 | { |
| 89 | struct net_bridge_port *p = (struct net_bridge_port *) arg; |
| 90 | struct net_bridge *br = p->br; |
| 91 | |
| 92 | pr_debug("%s: %d(%s) forward delay timer\n", |
| 93 | br->dev->name, p->port_no, p->dev->name); |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 94 | spin_lock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | if (p->state == BR_STATE_LISTENING) { |
| 96 | p->state = BR_STATE_LEARNING; |
| 97 | mod_timer(&p->forward_delay_timer, |
| 98 | jiffies + br->forward_delay); |
| 99 | } else if (p->state == BR_STATE_LEARNING) { |
| 100 | p->state = BR_STATE_FORWARDING; |
| 101 | if (br_is_designated_for_some_port(br)) |
| 102 | br_topology_change_detection(br); |
| 103 | } |
| 104 | br_log_state(p); |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 105 | spin_unlock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
| 108 | static void br_tcn_timer_expired(unsigned long arg) |
| 109 | { |
| 110 | struct net_bridge *br = (struct net_bridge *) arg; |
| 111 | |
| 112 | pr_debug("%s: tcn timer expired\n", br->dev->name); |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 113 | spin_lock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | if (br->dev->flags & IFF_UP) { |
| 115 | br_transmit_tcn(br); |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | mod_timer(&br->tcn_timer,jiffies + br->bridge_hello_time); |
| 118 | } |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 119 | spin_unlock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static void br_topology_change_timer_expired(unsigned long arg) |
| 123 | { |
| 124 | struct net_bridge *br = (struct net_bridge *) arg; |
| 125 | |
| 126 | pr_debug("%s: topo change timer expired\n", br->dev->name); |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 127 | spin_lock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | br->topology_change_detected = 0; |
| 129 | br->topology_change = 0; |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 130 | spin_unlock(&br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | static void br_hold_timer_expired(unsigned long arg) |
| 134 | { |
| 135 | struct net_bridge_port *p = (struct net_bridge_port *) arg; |
| 136 | |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 137 | pr_debug("%s: %d(%s) hold timer expired\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | p->br->dev->name, p->port_no, p->dev->name); |
| 139 | |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 140 | spin_lock(&p->br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | if (p->config_pending) |
| 142 | br_transmit_config(p); |
Stephen Hemminger | e3efe08 | 2006-03-20 22:56:25 -0800 | [diff] [blame] | 143 | spin_unlock(&p->br->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | void br_stp_timer_init(struct net_bridge *br) |
| 147 | { |
Stephen Hemminger | a95fcac | 2006-03-20 22:56:38 -0800 | [diff] [blame] | 148 | setup_timer(&br->hello_timer, br_hello_timer_expired, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | (unsigned long) br); |
| 150 | |
Stephen Hemminger | a95fcac | 2006-03-20 22:56:38 -0800 | [diff] [blame] | 151 | setup_timer(&br->tcn_timer, br_tcn_timer_expired, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | (unsigned long) br); |
| 153 | |
Stephen Hemminger | a95fcac | 2006-03-20 22:56:38 -0800 | [diff] [blame] | 154 | setup_timer(&br->topology_change_timer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | br_topology_change_timer_expired, |
| 156 | (unsigned long) br); |
| 157 | |
Stephen Hemminger | a95fcac | 2006-03-20 22:56:38 -0800 | [diff] [blame] | 158 | setup_timer(&br->gc_timer, br_fdb_cleanup, (unsigned long) br); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | void br_stp_port_timer_init(struct net_bridge_port *p) |
| 162 | { |
Stephen Hemminger | a95fcac | 2006-03-20 22:56:38 -0800 | [diff] [blame] | 163 | setup_timer(&p->message_age_timer, br_message_age_timer_expired, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | (unsigned long) p); |
| 165 | |
Stephen Hemminger | a95fcac | 2006-03-20 22:56:38 -0800 | [diff] [blame] | 166 | setup_timer(&p->forward_delay_timer, br_forward_delay_timer_expired, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | (unsigned long) p); |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 168 | |
Stephen Hemminger | a95fcac | 2006-03-20 22:56:38 -0800 | [diff] [blame] | 169 | setup_timer(&p->hold_timer, br_hold_timer_expired, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | (unsigned long) p); |
YOSHIFUJI Hideaki | 9d6f229 | 2007-02-09 23:24:35 +0900 | [diff] [blame] | 171 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | /* Report ticks left (in USER_HZ) used for API */ |
| 174 | unsigned long br_timer_value(const struct timer_list *timer) |
| 175 | { |
| 176 | return timer_pending(timer) |
| 177 | ? jiffies_to_clock_t(timer->expires - jiffies) : 0; |
| 178 | } |