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* Linux ethernet bridge
* Authors:
* Lennert Buytenhek <>
* 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.
#define BPDU_TYPE_TCN 0x80
/* IEEE 802.1D-1998 timer values */
#define BR_MIN_HELLO_TIME (1*HZ)
#define BR_MAX_HELLO_TIME (10*HZ)
#define BR_MIN_MAX_AGE (6*HZ)
#define BR_MAX_MAX_AGE (40*HZ)
#define BR_MIN_PATH_COST 1
#define BR_MAX_PATH_COST 65535
struct br_config_bpdu
unsigned topology_change:1;
unsigned topology_change_ack:1;
bridge_id root;
int root_path_cost;
bridge_id bridge_id;
port_id port_id;
int message_age;
int max_age;
int hello_time;
int forward_delay;
/* called under bridge lock */
static inline int br_is_designated_port(const struct net_bridge_port *p)
return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
(p->designated_port == p->port_id);
/* br_stp.c */
extern void br_become_root_bridge(struct net_bridge *br);
extern void br_config_bpdu_generation(struct net_bridge *);
extern void br_configuration_update(struct net_bridge *);
extern void br_port_state_selection(struct net_bridge *);
extern void br_received_config_bpdu(struct net_bridge_port *p,
const struct br_config_bpdu *bpdu);
extern void br_received_tcn_bpdu(struct net_bridge_port *p);
extern void br_transmit_config(struct net_bridge_port *p);
extern void br_transmit_tcn(struct net_bridge *br);
extern void br_topology_change_detection(struct net_bridge *br);
/* br_stp_bpdu.c */
extern void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);
extern void br_send_tcn_bpdu(struct net_bridge_port *);
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