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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/net/bridge/br_private_stp.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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/*

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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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#ifndef _BR_PRIVATE_STP_H

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#define _BR_PRIVATE_STP_H

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#define BPDU_TYPE_CONFIG 0

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#define BPDU_TYPE_TCN 0x80

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/* IEEE 802.1D-1998 timer values */

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#define BR_MIN_HELLO_TIME	(1*HZ)

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#define BR_MAX_HELLO_TIME	(10*HZ)

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#define BR_MIN_FORWARD_DELAY	(2*HZ)

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#define BR_MAX_FORWARD_DELAY	(30*HZ)

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#define BR_MIN_MAX_AGE		(6*HZ)

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#define BR_MAX_MAX_AGE		(40*HZ)

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#define BR_MIN_PATH_COST	1

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#define BR_MAX_PATH_COST	65535

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struct br_config_bpdu {

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	unsigned int	topology_change:1;

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	unsigned int	topology_change_ack:1;

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	bridge_id	root;

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	int		root_path_cost;

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	bridge_id	bridge_id;

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	port_id		port_id;

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	int		message_age;

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	int		max_age;

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	int		hello_time;

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	int		forward_delay;

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};

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/* called under bridge lock */

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static inline int br_is_designated_port(const struct net_bridge_port *p)

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{

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	return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&

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		(p->designated_port == p->port_id);

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}

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/* br_stp.c */

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void br_become_root_bridge(struct net_bridge *br);

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void br_config_bpdu_generation(struct net_bridge *);

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void br_configuration_update(struct net_bridge *);

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void br_port_state_selection(struct net_bridge *);

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void br_received_config_bpdu(struct net_bridge_port *p,

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			     const struct br_config_bpdu *bpdu);

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void br_received_tcn_bpdu(struct net_bridge_port *p);

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void br_transmit_config(struct net_bridge_port *p);

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void br_transmit_tcn(struct net_bridge *br);

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void br_topology_change_detection(struct net_bridge *br);

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void __br_set_topology_change(struct net_bridge *br, unsigned char val);

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/* br_stp_bpdu.c */

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void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);

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void br_send_tcn_bpdu(struct net_bridge_port *);

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#endif

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