1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Linux ethernet bridge 4 * 5 * Authors: 6 * Lennert Buytenhek <buytenh@gnu.org> 7 */ 8 9 #ifndef _BR_PRIVATE_STP_H 10 #define _BR_PRIVATE_STP_H 11 12 #define BPDU_TYPE_CONFIG 0 13 #define BPDU_TYPE_TCN 0x80 14 15 /* IEEE 802.1D-1998 timer values */ 16 #define BR_MIN_HELLO_TIME (1*HZ) 17 #define BR_MAX_HELLO_TIME (10*HZ) 18 19 #define BR_MIN_FORWARD_DELAY (2*HZ) 20 #define BR_MAX_FORWARD_DELAY (30*HZ) 21 22 #define BR_MIN_MAX_AGE (6*HZ) 23 #define BR_MAX_MAX_AGE (40*HZ) 24 25 #define BR_MIN_PATH_COST 1 26 #define BR_MAX_PATH_COST 65535 27 28 struct br_config_bpdu { 29 unsigned int topology_change:1; 30 unsigned int topology_change_ack:1; 31 bridge_id root; 32 int root_path_cost; 33 bridge_id bridge_id; 34 port_id port_id; 35 int message_age; 36 int max_age; 37 int hello_time; 38 int forward_delay; 39 }; 40 41 /* called under bridge lock */ br_is_designated_port(const struct net_bridge_port * p)42static inline int br_is_designated_port(const struct net_bridge_port *p) 43 { 44 return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) && 45 (p->designated_port == p->port_id); 46 } 47 48 49 /* br_stp.c */ 50 void br_become_root_bridge(struct net_bridge *br); 51 void br_config_bpdu_generation(struct net_bridge *); 52 void br_configuration_update(struct net_bridge *); 53 void br_port_state_selection(struct net_bridge *); 54 void br_received_config_bpdu(struct net_bridge_port *p, 55 const struct br_config_bpdu *bpdu); 56 void br_received_tcn_bpdu(struct net_bridge_port *p); 57 void br_transmit_config(struct net_bridge_port *p); 58 void br_transmit_tcn(struct net_bridge *br); 59 void br_topology_change_detection(struct net_bridge *br); 60 void __br_set_topology_change(struct net_bridge *br, unsigned char val); 61 62 /* br_stp_bpdu.c */ 63 void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *); 64 void br_send_tcn_bpdu(struct net_bridge_port *); 65 66 #endif 67