release/src-rt-6.x.4708/linux/linux-2.6.36/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 struct br_config_bpdu
  20 {
  21         unsigned        topology_change:1;
  22         unsigned        topology_change_ack:1;
  23         bridge_id       root;
  24         int             root_path_cost;
  25         bridge_id       bridge_id;
  26         port_id         port_id;
  27         int             message_age;
  28         int             max_age;
  29         int             hello_time;
  30         int             forward_delay;
  31 };
  32
  33 /* called under bridge lock */
  34 static inline int br_is_designated_port(const struct net_bridge_port *p)
  35 {
  36         return !memcmp(&p->designated_bridge, &p->br->bridge_id, 8) &&
  37                 (p->designated_port == p->port_id);
  38 }
  39
  40
  41 /* br_stp.c */
  42 extern void br_become_root_bridge(struct net_bridge *br);
  43 extern void br_config_bpdu_generation(struct net_bridge *);
  44 extern void br_configuration_update(struct net_bridge *);
  45 extern void br_port_state_selection(struct net_bridge *);
  46 extern void br_received_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu);
  47 extern void br_received_tcn_bpdu(struct net_bridge_port *p);
  48 extern void br_transmit_config(struct net_bridge_port *p);
  49 extern void br_transmit_tcn(struct net_bridge *br);
  50 extern void br_topology_change_detection(struct net_bridge *br);
  51
  52 /* br_stp_bpdu.c */
  53 extern void br_send_config_bpdu(struct net_bridge_port *, struct br_config_bpdu *);
  54 extern void br_send_tcn_bpdu(struct net_bridge_port *);
  55
  56 #endif