/* 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 <buytenh@gnu.org>
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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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