br_private_stp.h

Go to the documentation of this file.

/*
 *  Linux ethernet bridge
 *
 *  Authors:
 *  Lennert Buytenhek       <[email protected]>
 *
 *  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.
 */

#ifndef _BR_PRIVATE_STP_H
#define _BR_PRIVATE_STP_H

#define BPDU_TYPE_CONFIG 0
#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_FORWARD_DELAY    (2*HZ)
#define BR_MAX_FORWARD_DELAY    (30*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 int    topology_change:1;
    unsigned int    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 *);

#endif