net/bridge/br_private_stp.h

   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 */
  42 static 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