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
|
/*
* This file is part of RTRlib.
*
* This file is subject to the terms and conditions of the MIT license.
* See the file LICENSE in the top level directory for more details.
*
* Website: http://rtrlib.realmv6.org/
*/
#include "rtr_private.h"
#include "rtrlib/lib/log_private.h"
#include "rtrlib/lib/utils_private.h"
#include "rtrlib/pfx/pfx_private.h"
#include "rtrlib/rtr/packets_private.h"
#include "rtrlib/rtrlib_export_private.h"
#include "rtrlib/spki/hashtable/ht-spkitable_private.h"
#include "rtrlib/transport/transport_private.h"
#include <assert.h>
#include <pthread.h>
#include <signal.h>
#include <unistd.h>
static void rtr_purge_outdated_records(struct rtr_socket *rtr_socket);
static void *rtr_fsm_start(struct rtr_socket *rtr_socket);
static const char *socket_str_states[] = {[RTR_CONNECTING] = "RTR_CONNECTING",
[RTR_ESTABLISHED] = "RTR_ESTABLISHED",
[RTR_RESET] = "RTR_RESET",
[RTR_SYNC] = "RTR_SYNC",
[RTR_FAST_RECONNECT] = "RTR_FAST_RECONNECT",
[RTR_ERROR_NO_DATA_AVAIL] = "RTR_ERROR_NO_DATA_AVAIL",
[RTR_ERROR_NO_INCR_UPDATE_AVAIL] = "RTR_ERROR_NO_INCR_UPDATE_AVAIL",
[RTR_ERROR_FATAL] = "RTR_ERROR_FATAL",
[RTR_ERROR_TRANSPORT] = "RTR_ERROR_TRANSPORT",
[RTR_SHUTDOWN] = "RTR_SHUTDOWN"};
int rtr_init(struct rtr_socket *rtr_socket, struct tr_socket *tr, struct pfx_table *pfx_table,
struct spki_table *spki_table, const unsigned int refresh_interval, const unsigned int expire_interval,
const unsigned int retry_interval, enum rtr_interval_mode iv_mode, rtr_connection_state_fp fp,
void *fp_param_config, void *fp_param_group)
{
if (tr)
rtr_socket->tr_socket = tr;
// Check if one of the intervals is not in range of the predefined values.
if (rtr_check_interval_range(refresh_interval, RTR_REFRESH_MIN, RTR_REFRESH_MAX) != RTR_INSIDE_INTERVAL_RANGE ||
rtr_check_interval_range(expire_interval, RTR_EXPIRATION_MIN, RTR_EXPIRATION_MAX) !=
RTR_INSIDE_INTERVAL_RANGE ||
rtr_check_interval_range(retry_interval, RTR_RETRY_MIN, RTR_RETRY_MAX) != RTR_INSIDE_INTERVAL_RANGE) {
RTR_DBG("Interval value not in range.");
return RTR_INVALID_PARAM;
}
rtr_socket->refresh_interval = refresh_interval;
rtr_socket->expire_interval = expire_interval;
rtr_socket->retry_interval = retry_interval;
rtr_socket->iv_mode = iv_mode;
rtr_socket->state = RTR_CLOSED;
rtr_socket->request_session_id = true;
rtr_socket->serial_number = 0;
rtr_socket->last_update = 0;
rtr_socket->pfx_table = pfx_table;
rtr_socket->spki_table = spki_table;
rtr_socket->connection_state_fp = fp;
rtr_socket->connection_state_fp_param_config = fp_param_config;
rtr_socket->connection_state_fp_param_group = fp_param_group;
rtr_socket->thread_id = 0;
rtr_socket->version = RTR_PROTOCOL_MAX_SUPPORTED_VERSION;
rtr_socket->has_received_pdus = false;
rtr_socket->is_resetting = false;
return RTR_SUCCESS;
}
int rtr_start(struct rtr_socket *rtr_socket)
{
if (rtr_socket->thread_id)
return RTR_ERROR;
int rtval = pthread_create(&(rtr_socket->thread_id), NULL, (void *(*)(void *)) &rtr_fsm_start, rtr_socket);
if (rtval == 0)
return RTR_SUCCESS;
return RTR_ERROR;
}
void rtr_purge_outdated_records(struct rtr_socket *rtr_socket)
{
if (rtr_socket->last_update == 0)
return;
time_t cur_time;
int rtval = lrtr_get_monotonic_time(&cur_time);
if (rtval == -1 || (rtr_socket->last_update + rtr_socket->expire_interval) < cur_time) {
if (rtval == -1)
RTR_DBG1("get_monotic_time(..) failed");
pfx_table_src_remove(rtr_socket->pfx_table, rtr_socket);
RTR_DBG1("Removed outdated records from pfx_table");
spki_table_src_remove(rtr_socket->spki_table, rtr_socket);
RTR_DBG1("Removed outdated router keys from spki_table");
rtr_socket->request_session_id = true;
rtr_socket->serial_number = 0;
rtr_socket->last_update = 0;
rtr_socket->is_resetting = true;
}
}
/* WARNING: This Function has cancelable sections*/
void *rtr_fsm_start(struct rtr_socket *rtr_socket)
{
if (rtr_socket->state == RTR_SHUTDOWN)
return NULL;
// We don't care about the old state, but POSIX demands a non null value for setcancelstate
int oldcancelstate;
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldcancelstate);
rtr_socket->state = RTR_CONNECTING;
while (1) {
if (rtr_socket->state == RTR_CONNECTING) {
RTR_DBG1("State: RTR_CONNECTING");
rtr_socket->has_received_pdus = false;
// old pfx_record could exists in the pfx_table, check if they are too old and must be removed
// old key_entry could exists in the spki_table, check if they are too old and must be removed
rtr_purge_outdated_records(rtr_socket);
if (tr_open(rtr_socket->tr_socket) == TR_ERROR) {
rtr_change_socket_state(rtr_socket, RTR_ERROR_TRANSPORT);
} else if (rtr_socket->request_session_id) {
// change to state RESET, if socket doesn't have a session_id
rtr_change_socket_state(rtr_socket, RTR_RESET);
} else {
// if we already have a session_id, send a serial query and start to sync
if (rtr_send_serial_query(rtr_socket) == RTR_SUCCESS)
rtr_change_socket_state(rtr_socket, RTR_SYNC);
else
rtr_change_socket_state(rtr_socket, RTR_ERROR_FATAL);
}
}
else if (rtr_socket->state == RTR_RESET) {
RTR_DBG1("State: RTR_RESET");
if (rtr_send_reset_query(rtr_socket) == RTR_SUCCESS) {
RTR_DBG1("rtr_start: reset pdu sent");
rtr_change_socket_state(rtr_socket,
RTR_SYNC); // start to sync after connection is established
}
}
else if (rtr_socket->state == RTR_SYNC) {
RTR_DBG1("State: RTR_SYNC");
if (rtr_sync(rtr_socket) == RTR_SUCCESS)
rtr_change_socket_state(
rtr_socket,
RTR_ESTABLISHED); // wait for next sync after first successful sync
}
else if (rtr_socket->state == RTR_ESTABLISHED) {
RTR_DBG1("State: RTR_ESTABLISHED");
// Allow thread cancellation for recv code path only.
// This should be enough since we spend most of the time blocking on recv
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldcancelstate);
int ret = rtr_wait_for_sync(
rtr_socket); // blocks till expire_interval is expired or PDU was received
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldcancelstate);
if (ret == RTR_SUCCESS) { // send serial query
if (rtr_send_serial_query(rtr_socket) == RTR_SUCCESS)
rtr_change_socket_state(rtr_socket, RTR_SYNC);
}
}
else if (rtr_socket->state == RTR_FAST_RECONNECT) {
RTR_DBG1("State: RTR_FAST_RECONNECT");
tr_close(rtr_socket->tr_socket);
rtr_change_socket_state(rtr_socket, RTR_CONNECTING);
}
else if (rtr_socket->state == RTR_ERROR_NO_DATA_AVAIL) {
RTR_DBG1("State: RTR_ERROR_NO_DATA_AVAIL");
rtr_socket->request_session_id = true;
rtr_socket->serial_number = 0;
rtr_change_socket_state(rtr_socket, RTR_RESET);
sleep(rtr_socket->retry_interval);
rtr_purge_outdated_records(rtr_socket);
}
else if (rtr_socket->state == RTR_ERROR_NO_INCR_UPDATE_AVAIL) {
RTR_DBG1("State: RTR_ERROR_NO_INCR_UPDATE_AVAIL");
rtr_socket->request_session_id = true;
rtr_socket->serial_number = 0;
rtr_change_socket_state(rtr_socket, RTR_RESET);
rtr_purge_outdated_records(rtr_socket);
}
else if (rtr_socket->state == RTR_ERROR_TRANSPORT) {
RTR_DBG1("State: RTR_ERROR_TRANSPORT");
tr_close(rtr_socket->tr_socket);
rtr_change_socket_state(rtr_socket, RTR_CONNECTING);
RTR_DBG("Waiting %u", rtr_socket->retry_interval);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldcancelstate);
sleep(rtr_socket->retry_interval);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldcancelstate);
}
else if (rtr_socket->state == RTR_ERROR_FATAL) {
RTR_DBG1("State: RTR_ERROR_FATAL");
tr_close(rtr_socket->tr_socket);
rtr_change_socket_state(rtr_socket, RTR_CONNECTING);
RTR_DBG("Waiting %u", rtr_socket->retry_interval);
pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &oldcancelstate);
sleep(rtr_socket->retry_interval);
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldcancelstate);
}
else if (rtr_socket->state == RTR_SHUTDOWN) {
RTR_DBG1("State: RTR_SHUTDOWN");
pthread_exit(NULL);
}
}
}
void rtr_stop(struct rtr_socket *rtr_socket)
{
RTR_DBG("%s()", __func__);
rtr_change_socket_state(rtr_socket, RTR_SHUTDOWN);
if (rtr_socket->thread_id != 0) {
RTR_DBG1("pthread_cancel()");
pthread_cancel(rtr_socket->thread_id);
RTR_DBG1("pthread_join()");
pthread_join(rtr_socket->thread_id, NULL);
tr_close(rtr_socket->tr_socket);
rtr_socket->request_session_id = true;
rtr_socket->serial_number = 0;
rtr_socket->last_update = 0;
pfx_table_src_remove(rtr_socket->pfx_table, rtr_socket);
spki_table_src_remove(rtr_socket->spki_table, rtr_socket);
rtr_socket->thread_id = 0;
}
RTR_DBG1("Socket shut down");
}
RTRLIB_EXPORT const char *rtr_state_to_str(enum rtr_socket_state state)
{
return socket_str_states[state];
}
/* cppcheck-suppress unusedFunction */
RTRLIB_EXPORT enum rtr_interval_mode rtr_get_interval_mode(struct rtr_socket *rtr_socket)
{
return rtr_socket->iv_mode;
}
/* cppcheck-suppress unusedFunction */
RTRLIB_EXPORT void rtr_set_interval_mode(struct rtr_socket *rtr_socket, enum rtr_interval_mode option)
{
switch (option) {
case RTR_INTERVAL_MODE_IGNORE_ANY:
case RTR_INTERVAL_MODE_ACCEPT_ANY:
case RTR_INTERVAL_MODE_DEFAULT_MIN_MAX:
case RTR_INTERVAL_MODE_IGNORE_ON_FAILURE:
rtr_socket->iv_mode = option;
break;
default:
RTR_DBG1("Invalid interval mode. Mode remains unchanged.");
}
}
|
