1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
* BIRD Internet Routing Daemon -- Protocols
*
* (c) 1998--1999 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifndef _BIRD_PROTOCOL_H_
#define _BIRD_PROTOCOL_H_
#include "lib/lists.h"
#include "lib/resource.h"
struct iface;
struct rte;
struct neighbor;
struct rta;
struct network;
struct proto_config;
struct config;
struct proto;
struct event;
/*
* Routing Protocol
*/
struct protocol {
node n;
char *name;
unsigned debug; /* Default debugging flags */
int priority; /* Protocol priority (usually 0) */
void (*preconfig)(struct protocol *, struct config *); /* Just before configuring */
void (*postconfig)(struct proto_config *); /* After configuring each instance */
struct proto * (*init)(struct proto_config *); /* Create new instance */
int (*reconfigure)(struct proto *, struct proto_config *); /* Try to reconfigure instance */
void (*dump)(struct proto *); /* Debugging dump */
int (*start)(struct proto *); /* Start the instance */
int (*shutdown)(struct proto *); /* Stop the instance */
};
void protos_build(void);
void protos_preconfig(struct config *);
void protos_postconfig(struct config *);
void protos_commit(struct config *);
void protos_start(void);
void protos_dump_all(void);
void protos_shutdown(void);
extern list protocol_list;
/*
* Known protocols
*/
extern struct protocol proto_device;
extern struct protocol proto_rip;
extern struct protocol proto_static;
extern struct protocol proto_ospf;
/*
* Routing Protocol Instance
*/
struct proto_config {
node n;
struct config *global; /* Global configuration data */
struct protocol *proto; /* Protocol */
char *name;
unsigned debug, preference, disabled; /* Generic parameters */
struct filter *in_filter, *out_filter; /* Attached filters */
/* Protocol-specific data follow... */
};
struct proto {
node n;
struct protocol *proto; /* Protocol */
struct proto_config *cf; /* Configuration data */
pool *pool; /* Pool containing local objects */
struct event *attn; /* "Pay attention" event */
char *name; /* Name of this instance (== cf->name) */
unsigned debug; /* Debugging flags */
unsigned preference; /* Default route preference */
unsigned disabled; /* Manually disabled */
unsigned proto_state; /* Protocol state machine (see below) */
unsigned core_state; /* Core state machine (see below) */
unsigned core_goal; /* State we want to reach (see below) */
void (*if_notify)(struct proto *, unsigned flags, struct iface *new, struct iface *old);
void (*rt_notify)(struct proto *, struct network *net, struct rte *new, struct rte *old);
void (*neigh_notify)(struct neighbor *neigh);
int (*rte_better)(struct rte *, struct rte *);
void (*rte_insert)(struct network *, struct rte *);
void (*rte_remove)(struct network *, struct rte *);
struct filter *in_filter; /* Input filter */
struct filter *out_filter; /* Output filter */
/* Connection to routing tables? */
/* Hic sunt protocol-specific data */
};
void proto_build(struct proto_config *);
void *proto_new(struct proto_config *, unsigned size);
void *proto_config_new(struct protocol *, unsigned size);
extern list proto_list;
/*
* Each protocol instance runs two different state machines:
*
* [P] The protocol machine: (implemented inside protocol)
*
* DOWN ----> START
* ^ |
* | V
* STOP <---- UP
*
* States: DOWN Protocol is down and it's waiting for the core
* requesting protocol start.
* START Protocol is waiting for connection with the rest
* of the network and it's not willing to accept
* packets. When it connects, it goes to UP state.
* UP Protocol is up and running. When the network
* connection breaks down or the core requests
* protocol to be terminated, it goes to STOP state.
* STOP Protocol is disconnecting from the network.
* After it disconnects, it returns to DOWN state.
*
* In: start() Called in DOWN state to request protocol startup.
* Returns new state: either UP or START (in this
* case, the protocol will notify the core when it
* finally comes UP).
* stop() Called in START, UP or STOP state to request
* protocol shutdown. Returns new state: either
* DOWN or STOP (in this case, the protocol will
* notify the core when it finally comes DOWN).
*
* Out: proto_notify_state() -- called by protocol instance when
* it does any state transition not covered by
* return values of start() and stop(). This includes
* START->UP (delayed protocol startup), UP->STOP
* (spontaneous shutdown) and STOP->DOWN (delayed
* shutdown).
*/
#define PS_DOWN 0
#define PS_START 1
#define PS_UP 2
#define PS_STOP 3
void proto_notify_state(struct proto *p, unsigned state);
/*
* [F] The feeder machine: (implemented in core routines)
*
* HUNGRY ----> FEEDING
* ^ |
* | V
* FLUSHING <---- HAPPY
*
* States: HUNGRY Protocol either administratively down (i.e.,
* disabled by the user) or temporarily down
* (i.e., [P] is not UP)
* FEEDING The protocol came up and we're feeding it
* initial routes. [P] is UP.
* HAPPY The protocol is up and it's receiving normal
* routing updates. [P] is UP.
* FLUSHING The protocol is down and we're removing its
* routes from the table. [P] is STOP or DOWN.
*
* Normal lifecycle of a protocol looks like:
*
* HUNGRY/DOWN --> HUNGRY/START --> HUNGRY/UP -->
* FEEDING/UP --> HAPPY/UP --> FLUSHING/STOP|DOWN -->
* HUNGRY/STOP|DOWN --> HUNGRY/DOWN
*/
#define FS_HUNGRY 0
#define FS_FEEDING 1
#define FS_HAPPY 2
#define FS_FLUSHING 3
/*
* Known unique protocol instances as referenced by config routines
*/
extern struct proto_config *cf_dev_proto;
/*
* Callback to sysdep code when shutdown is finished
*/
void protos_shutdown_notify(void);
#endif
|
