LXR linux/net/bridge/br_private

   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
  28struct 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 */
  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 */
  50void br_become_root_bridge(struct net_bridge *br);
  51void br_config_bpdu_generation(struct net_bridge *);
  52void br_configuration_update(struct net_bridge *);
  53void br_port_state_selection(struct net_bridge *);
  54void br_received_config_bpdu(struct net_bridge_port *p,
  55                             const struct br_config_bpdu *bpdu);
  56void br_received_tcn_bpdu(struct net_bridge_port *p);
  57void br_transmit_config(struct net_bridge_port *p);
  58void br_transmit_tcn(struct net_bridge *br);
  59void br_topology_change_detection(struct net_bridge *br);
  60void __br_set_topology_change(struct net_bridge *br, unsigned char val);
  61
  62/* br_stp_bpdu.c */
  63void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);
  64void br_send_tcn_bpdu(struct net_bridge_port *);
  65
  66#endif
  67