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
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
|
/* $OpenBSD: session.h,v 1.144 2020/01/24 05:44:05 claudio Exp $ */
/*
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <time.h>
#define MAX_BACKLOG 5
#define INTERVAL_CONNECTRETRY 120
#define INTERVAL_HOLD_INITIAL 240
#define INTERVAL_HOLD 90
#define INTERVAL_IDLE_HOLD_INITIAL 30
#define INTERVAL_HOLD_CLONED 3600
#define INTERVAL_HOLD_DEMOTED 60
#define MAX_IDLE_HOLD 3600
#define MSGSIZE_HEADER 19
#define MSGSIZE_HEADER_MARKER 16
#define MSGSIZE_NOTIFICATION_MIN 21 /* 19 hdr + 1 code + 1 sub */
#define MSGSIZE_OPEN_MIN 29
#define MSGSIZE_UPDATE_MIN 23
#define MSGSIZE_KEEPALIVE MSGSIZE_HEADER
#define MSGSIZE_RREFRESH MSGSIZE_HEADER + 4
#define MSG_PROCESS_LIMIT 25
#define SESSION_CLEAR_DELAY 5
enum session_state {
STATE_NONE,
STATE_IDLE,
STATE_CONNECT,
STATE_ACTIVE,
STATE_OPENSENT,
STATE_OPENCONFIRM,
STATE_ESTABLISHED
};
enum session_events {
EVNT_NONE,
EVNT_START,
EVNT_STOP,
EVNT_CON_OPEN,
EVNT_CON_CLOSED,
EVNT_CON_OPENFAIL,
EVNT_CON_FATAL,
EVNT_TIMER_CONNRETRY,
EVNT_TIMER_HOLDTIME,
EVNT_TIMER_KEEPALIVE,
EVNT_RCVD_OPEN,
EVNT_RCVD_KEEPALIVE,
EVNT_RCVD_UPDATE,
EVNT_RCVD_NOTIFICATION
};
enum msg_type {
OPEN = 1,
UPDATE,
NOTIFICATION,
KEEPALIVE,
RREFRESH
};
enum suberr_header {
ERR_HDR_SYNC = 1,
ERR_HDR_LEN,
ERR_HDR_TYPE
};
enum suberr_open {
ERR_OPEN_VERSION = 1,
ERR_OPEN_AS,
ERR_OPEN_BGPID,
ERR_OPEN_OPT,
ERR_OPEN_AUTH,
ERR_OPEN_HOLDTIME,
ERR_OPEN_CAPA,
ERR_OPEN_GROUP_CONFLICT, /* draft-ietf-idr-bgp-multisession-07 */
ERR_OPEN_GROUP_REQUIRED /* draft-ietf-idr-bgp-multisession-07 */
};
enum suberr_fsm {
ERR_FSM_UNSPECIFIC = 0,
ERR_FSM_UNEX_OPENSENT,
ERR_FSM_UNEX_OPENCONFIRM,
ERR_FSM_UNEX_ESTABLISHED
};
enum opt_params {
OPT_PARAM_NONE,
OPT_PARAM_AUTH,
OPT_PARAM_CAPABILITIES
};
enum capa_codes {
CAPA_NONE,
CAPA_MP,
CAPA_REFRESH,
CAPA_RESTART = 64,
CAPA_AS4BYTE = 65
};
struct bgp_msg {
struct ibuf *buf;
enum msg_type type;
u_int16_t len;
};
struct msg_header {
u_char marker[MSGSIZE_HEADER_MARKER];
u_int16_t len;
u_int8_t type;
};
struct msg_open {
struct msg_header header;
u_int32_t bgpid;
u_int16_t myas;
u_int16_t holdtime;
u_int8_t version;
u_int8_t optparamlen;
};
struct bgpd_sysdep {
u_int8_t no_pfkey;
u_int8_t no_md5sig;
};
struct ctl_conn {
TAILQ_ENTRY(ctl_conn) entry;
struct imsgbuf ibuf;
int restricted;
int throttled;
int terminate;
};
TAILQ_HEAD(ctl_conns, ctl_conn) ctl_conns;
struct peer_stats {
unsigned long long msg_rcvd_open;
unsigned long long msg_rcvd_update;
unsigned long long msg_rcvd_notification;
unsigned long long msg_rcvd_keepalive;
unsigned long long msg_rcvd_rrefresh;
unsigned long long msg_sent_open;
unsigned long long msg_sent_update;
unsigned long long msg_sent_notification;
unsigned long long msg_sent_keepalive;
unsigned long long msg_sent_rrefresh;
unsigned long long prefix_rcvd_update;
unsigned long long prefix_rcvd_withdraw;
unsigned long long prefix_rcvd_eor;
unsigned long long prefix_sent_update;
unsigned long long prefix_sent_withdraw;
unsigned long long prefix_sent_eor;
time_t last_updown;
time_t last_read;
time_t last_write;
u_int32_t prefix_cnt;
u_int32_t prefix_out_cnt;
u_int8_t last_sent_errcode;
u_int8_t last_sent_suberr;
u_int8_t last_rcvd_errcode;
u_int8_t last_rcvd_suberr;
char last_shutcomm[SHUT_COMM_LEN];
};
enum Timer {
Timer_None,
Timer_ConnectRetry,
Timer_Keepalive,
Timer_Hold,
Timer_IdleHold,
Timer_IdleHoldReset,
Timer_CarpUndemote,
Timer_RestartTimeout,
Timer_Max
};
struct peer_timer {
TAILQ_ENTRY(peer_timer) entry;
enum Timer type;
time_t val;
};
TAILQ_HEAD(peer_timer_head, peer_timer);
struct peer {
struct peer_config conf;
struct peer_stats stats;
RB_ENTRY(peer) entry;
struct {
struct capabilities ann;
struct capabilities peer;
struct capabilities neg;
} capa;
struct {
struct bgpd_addr local_addr;
u_int32_t spi_in;
u_int32_t spi_out;
enum auth_method method;
u_int8_t established;
} auth;
struct bgpd_addr local;
struct bgpd_addr remote;
struct peer_timer_head timers;
struct msgbuf wbuf;
struct ibuf_read *rbuf;
struct peer *template;
int fd;
int lasterr;
u_int errcnt;
u_int IdleHoldTime;
u_int32_t remote_bgpid;
enum session_state state;
enum session_state prev_state;
enum reconf_action reconf_action;
u_int16_t short_as;
u_int16_t holdtime;
u_int16_t local_port;
u_int16_t remote_port;
u_int8_t depend_ok;
u_int8_t demoted;
u_int8_t passive;
u_int8_t throttled;
u_int8_t rpending;
};
extern time_t pauseaccept;
struct ctl_timer {
enum Timer type;
time_t val;
};
/* carp.c */
int carp_demote_init(char *, int);
void carp_demote_shutdown(void);
int carp_demote_get(char *);
int carp_demote_set(char *, int);
/* config.c */
void merge_config(struct bgpd_config *, struct bgpd_config *);
int prepare_listeners(struct bgpd_config *);
/* control.c */
int control_check(char *);
int control_init(int, char *);
int control_listen(int);
void control_shutdown(int);
int control_dispatch_msg(struct pollfd *, u_int *, struct peer_head *);
unsigned int control_accept(int, int);
/* log.c */
char *log_fmt_peer(const struct peer_config *);
void log_statechange(struct peer *, enum session_state,
enum session_events);
void log_notification(const struct peer *, u_int8_t, u_int8_t,
u_char *, u_int16_t, const char *);
void log_conn_attempt(const struct peer *, struct sockaddr *,
socklen_t);
/* mrt.c */
void mrt_dump_bgp_msg(struct mrt *, void *, u_int16_t,
struct peer *);
void mrt_dump_state(struct mrt *, u_int16_t, u_int16_t,
struct peer *);
void mrt_done(struct mrt *);
/* parse.y */
struct bgpd_config *parse_config(char *, struct peer_head *);
/* pfkey.c */
int pfkey_read(int, struct sadb_msg *);
int pfkey_establish(struct peer *);
int pfkey_remove(struct peer *);
int pfkey_init(void);
int tcp_md5_check(int, struct peer *);
int tcp_md5_set(int, struct peer *);
int tcp_md5_prep_listener(struct listen_addr *, struct peer_head *);
void tcp_md5_add_listener(struct bgpd_config *, struct peer *);
void tcp_md5_del_listener(struct bgpd_config *, struct peer *);
/* printconf.c */
void print_config(struct bgpd_config *, struct rib_names *);
/* rde.c */
void rde_main(int, int);
/* session.c */
RB_PROTOTYPE(peer_head, peer, entry, peer_compare);
void session_main(int, int);
void bgp_fsm(struct peer *, enum session_events);
int session_neighbor_rrefresh(struct peer *p);
struct peer *getpeerbydesc(struct bgpd_config *, const char *);
struct peer *getpeerbyip(struct bgpd_config *, struct sockaddr *);
struct peer *getpeerbyid(struct bgpd_config *, u_int32_t);
int peer_matched(struct peer *, struct ctl_neighbor *);
int imsg_ctl_parent(int, u_int32_t, pid_t, void *, u_int16_t);
int imsg_ctl_rde(int, pid_t, void *, u_int16_t);
void session_stop(struct peer *, u_int8_t);
/* timer.c */
struct peer_timer *timer_get(struct peer *, enum Timer);
struct peer_timer *timer_nextisdue(struct peer *, time_t);
time_t timer_nextduein(struct peer *, time_t);
int timer_running(struct peer *, enum Timer, time_t *);
void timer_set(struct peer *, enum Timer, u_int);
void timer_stop(struct peer *, enum Timer);
void timer_remove(struct peer *, enum Timer);
void timer_remove_all(struct peer *);
|
