net/bridge/br_private_stp.h

   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _BR_PRIVATE_STP_H
  14 #define _BR_PRIVATE_STP_H
  15
  16 #define BPDU_TYPE_CONFIG 0
  17 #define BPDU_TYPE_TCN 0x80
  18
  19 /* IEEE 802.1D-1998 timer values */
  20 #define BR_MIN_HELLO_TIME       (1*HZ)
  21 #define BR_MAX_HELLO_TIME       (10*HZ)
  22
  23 #define BR_MIN_FORWARD_DELAY    (2*HZ)
  24 #define BR_MAX_FORWARD_DELAY    (30*HZ)
  25
  26 #define BR_MIN_MAX_AGE          (6*HZ)
  27 #define BR_MAX_MAX_AGE          (40*HZ)
  28
  29 #define BR_MIN_PATH_COST        1
  30 #define BR_MAX_PATH_COST        65535
  31
  32 struct br_config_bpdu
  33 {
  34         unsigned        topology_change:1;
  35         unsigned        topology_change_ack:1;
  36         bridge_id       root;
  37         int             root_path_cost;
  38         bridge_id       bridge_id;
  39         port_id         port_id;
  40         int             message_age;
  41         int             max_age;
  42         int             hello_time;
  43         int             forward_delay;
  44 };
  45
  46 /* called under bridge lock */
  47 static inline int br_is_designated_port(const struct net_bridge_port *p)
  48 {
  49         return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
  50                 (p->designated_port == p->port_id);
  51 }
  52
  53
  54 /* br_stp.c */
  55 extern void br_become_root_bridge(struct net_bridge *br);
  56 extern void br_config_bpdu_generation(struct net_bridge *);
  57 extern void br_configuration_update(struct net_bridge *);
  58 extern void br_port_state_selection(struct net_bridge *);
  59 extern void br_received_config_bpdu(struct net_bridge_port *p,
  60                                     const struct br_config_bpdu *bpdu);
  61 extern void br_received_tcn_bpdu(struct net_bridge_port *p);
  62 extern void br_transmit_config(struct net_bridge_port *p);
  63 extern void br_transmit_tcn(struct net_bridge *br);
  64 extern void br_topology_change_detection(struct net_bridge *br);
  65
  66 /* br_stp_bpdu.c */
  67 extern void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);
  68 extern void br_send_tcn_bpdu(struct net_bridge_port *);
  69
  70 #endif