Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[linux-2.6.git] / 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