Commit | Line | Data |
---|---|---|
8af38ec0 JR |
1 | /* |
2 | * Copyright (C) 2017 - Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License, version 2 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along | |
14 | * with this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | */ | |
17 | ||
18 | #include <sys/types.h> | |
19 | #include <netinet/tcp.h> | |
20 | #include <stdbool.h> | |
21 | #include <sys/socket.h> | |
22 | #include <limits.h> | |
23 | ||
24 | #include <common/compat/getenv.h> | |
25 | #include <common/time.h> | |
26 | #include <common/defaults.h> | |
27 | #include <common/config/session-config.h> | |
28 | ||
29 | #include "tcp_keep_alive.h" | |
30 | ||
31 | #define SOLARIS_IDLE_TIME_MIN_S 10 | |
32 | #define SOLARIS_IDLE_TIME_MAX_S 864000 /* 10 days */ | |
33 | #define SOLARIS_ABORT_THRESHOLD_MIN_S 1 | |
34 | #define SOLARIS_ABORT_THRESHOLD_MAX_S 480 /* 8 minutes */ | |
35 | ||
36 | /* Per-platform definitions of TCP socket options. */ | |
37 | #if defined (__linux__) | |
38 | ||
8af38ec0 JR |
39 | #define COMPAT_TCP_LEVEL SOL_TCP |
40 | #define COMPAT_TCP_ABORT_THRESHOLD 0 /* Does not exist on linux. */ | |
41 | #define COMPAT_TCP_KEEPIDLE TCP_KEEPIDLE | |
42 | #define COMPAT_TCP_KEEPINTVL TCP_KEEPINTVL | |
43 | #define COMPAT_TCP_KEEPCNT TCP_KEEPCNT | |
44 | ||
45 | #elif defined (__sun__) /* ! defined (__linux__) */ | |
46 | ||
8af38ec0 JR |
47 | #define COMPAT_TCP_LEVEL IPPROTO_TCP |
48 | ||
49 | #ifdef TCP_KEEPALIVE_THRESHOLD | |
50 | #define COMPAT_TCP_KEEPIDLE TCP_KEEPALIVE_THRESHOLD | |
51 | #else /* ! defined (TCP_KEEPALIVE_THRESHOLD) */ | |
52 | #define COMPAT_TCP_KEEPIDLE 0 | |
53 | #endif /* TCP_KEEPALIVE_THRESHOLD */ | |
54 | ||
55 | #ifdef TCP_KEEPALIVE_ABORT_THRESHOLD | |
56 | #define COMPAT_TCP_ABORT_THRESHOLD TCP_KEEPALIVE_ABORT_THRESHOLD | |
57 | #else /* ! defined (TCP_KEEPALIVE_ABORT_THRESHOLD) */ | |
58 | #define COMPAT_TCP_ABORT_THRESHOLD 0 | |
59 | #endif /* TCP_KEEPALIVE_ABORT_THRESHOLD */ | |
60 | ||
61 | #define COMPAT_TCP_KEEPINTVL 0 /* Does not exist on Solaris. */ | |
62 | #define COMPAT_TCP_KEEPCNT 0 /* Does not exist on Solaris. */ | |
63 | ||
64 | #else /* ! defined (__linux__) && ! defined (__sun__) */ | |
65 | ||
8af38ec0 JR |
66 | #define COMPAT_TCP_LEVEL 0 |
67 | #define COMPAT_TCP_ABORT_THRESHOLD 0 | |
68 | #define COMPAT_TCP_KEEPIDLE 0 | |
69 | #define COMPAT_TCP_KEEPINTVL 0 | |
70 | #define COMPAT_TCP_KEEPCNT 0 | |
71 | ||
72 | #endif /* ! defined (__linux__) && ! defined (__sun__) */ | |
73 | ||
74 | struct tcp_keep_alive_support { | |
75 | /* TCP keep-alive is supported by this platform. */ | |
76 | bool supported; | |
77 | /* Overriding idle-time per socket is supported by this platform. */ | |
78 | bool idle_time_supported; | |
79 | /* | |
80 | * Overriding probe interval per socket is supported by this | |
81 | * platform. | |
82 | */ | |
83 | bool probe_interval_supported; | |
84 | /* | |
85 | * Configuring max probe count per socket is supported by this | |
86 | * platform. | |
87 | */ | |
88 | bool max_probe_count_supported; | |
89 | /* Overriding on a per-socket basis is supported by this platform. */ | |
90 | bool abort_threshold_supported; | |
91 | }; | |
92 | ||
93 | struct tcp_keep_alive_config { | |
94 | /* Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_ENV environment variable. */ | |
95 | bool enabled; | |
96 | /* | |
97 | * Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV environment | |
98 | * variable. | |
99 | */ | |
100 | int idle_time; | |
101 | /* | |
102 | * Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV | |
103 | * environment variable. | |
104 | */ | |
105 | int probe_interval; | |
106 | /* | |
107 | * Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV | |
108 | * environment variable. | |
109 | */ | |
110 | int max_probe_count; | |
111 | /* | |
112 | * Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV | |
113 | * environment variable. | |
114 | */ | |
115 | int abort_threshold; | |
116 | }; | |
117 | ||
118 | static struct tcp_keep_alive_config config = { | |
119 | .enabled = false, | |
120 | .idle_time = -1, | |
121 | .probe_interval = -1, | |
122 | .max_probe_count = -1, | |
123 | .abort_threshold = -1 | |
124 | }; | |
125 | ||
126 | static struct tcp_keep_alive_support support = { | |
127 | .supported = false, | |
128 | .idle_time_supported = false, | |
129 | .probe_interval_supported = false, | |
130 | .max_probe_count_supported = false, | |
131 | .abort_threshold_supported = false | |
132 | }; | |
133 | ||
134 | /* | |
135 | * Common parser for string to positive int conversion where the value must be | |
136 | * in range [-1, INT_MAX]. | |
137 | * | |
138 | * Returns -2 on invalid value. | |
139 | */ | |
140 | static | |
141 | int get_env_int(const char *env_var, | |
142 | const char *value) | |
143 | { | |
144 | int ret; | |
145 | long tmp; | |
146 | char *endptr = NULL; | |
147 | ||
148 | errno = 0; | |
149 | tmp = strtol(value, &endptr, 0); | |
150 | if (errno != 0) { | |
151 | ERR("%s cannot be parsed.", env_var); | |
152 | PERROR("errno for previous parsing failure"); | |
153 | ret = -2; | |
154 | goto end; | |
155 | } | |
156 | ||
157 | if (endptr == value || *endptr != '\0') { | |
158 | ERR("%s is not a valid number", env_var); | |
159 | ret = -1; | |
160 | goto end; | |
161 | } | |
162 | ||
163 | if (tmp < -1) { | |
164 | ERR("%s must be greater or equal to -1", env_var); | |
165 | ret = -2; | |
166 | goto end; | |
167 | } | |
168 | if (tmp > INT_MAX){ | |
169 | ERR("%s is too big. Maximum value is %d", env_var, INT_MAX); | |
170 | ret = -2; | |
171 | goto end; | |
172 | } | |
173 | ||
174 | ret = (int) tmp; | |
175 | end: | |
176 | return ret; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Per-platform implementation of tcp_keep_alive_idle_time_modifier. | |
181 | * Returns -2 on invalid value. | |
182 | */ | |
183 | #ifdef __sun__ | |
184 | ||
185 | static | |
186 | int convert_idle_time(int value) | |
187 | { | |
188 | int ret; | |
189 | unsigned int tmp_ms; | |
190 | ||
191 | if (value == -1 || value == 0) { | |
192 | /* Use system defaults */ | |
193 | ret = value; | |
194 | goto end; | |
195 | } | |
196 | ||
197 | if (value < 0) { | |
198 | ERR("Invalid tcp keep-alive idle time (%i)", value); | |
199 | ret = -2; | |
200 | goto end; | |
201 | } | |
202 | ||
203 | /* | |
204 | * Additional constraints for Solaris 11. | |
205 | * Minimum 10s, maximum 10 days. Defined by | |
206 | * https://docs.oracle.com/cd/E23824_01/html/821-1475/tcp-7p.html#REFMAN7tcp-7p | |
207 | */ | |
208 | if ((value < SOLARIS_IDLE_TIME_MIN_S || | |
209 | value > SOLARIS_IDLE_TIME_MAX_S)) { | |
210 | ERR("%s must be comprised between %d and %d inclusively on Solaris", | |
211 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV, | |
212 | SOLARIS_IDLE_TIME_MIN_S, | |
213 | SOLARIS_IDLE_TIME_MAX_S); | |
214 | ret = -2; | |
215 | goto end; | |
216 | } | |
217 | ||
218 | /* On Solaris idle time is given in milliseconds. */ | |
219 | tmp_ms = ((unsigned int) value) * MSEC_PER_SEC; | |
220 | if ((value != 0 && (tmp_ms / ((unsigned int) value)) != MSEC_PER_SEC) | |
221 | || tmp_ms > INT_MAX) { | |
222 | /* Overflow. */ | |
223 | const int max_value = INT_MAX / MSEC_PER_SEC; | |
224 | ||
225 | ERR("%s is too big: maximum supported value is %d", | |
226 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV, | |
227 | max_value); | |
228 | ret = -2; | |
229 | goto end; | |
230 | } | |
231 | ||
232 | /* tmp_ms is >= 0 and <= INT_MAX. Cast is safe. */ | |
233 | ret = (int) tmp_ms; | |
234 | end: | |
235 | return ret; | |
236 | } | |
237 | ||
238 | #else /* ! defined(__sun__) */ | |
239 | ||
240 | static | |
241 | int convert_idle_time(int value) | |
242 | { | |
243 | return value; | |
244 | } | |
245 | ||
246 | #endif /* ! defined(__sun__) */ | |
247 | ||
248 | /* Per-platform support of tcp_keep_alive functionality. */ | |
249 | #if defined (__linux__) | |
250 | ||
251 | static | |
252 | void tcp_keep_alive_init_support(struct tcp_keep_alive_support *support) | |
253 | { | |
254 | support->supported = true; | |
255 | support->idle_time_supported = true; | |
256 | support->probe_interval_supported = true; | |
257 | support->max_probe_count_supported = true; | |
258 | /* Solaris specific */ | |
259 | support->abort_threshold_supported = false; | |
260 | } | |
261 | ||
262 | #elif defined(__sun__) /* ! defined (__linux__) */ | |
263 | ||
264 | static | |
265 | void tcp_keep_alive_init_support(struct tcp_keep_alive_support *support) | |
266 | { | |
267 | support->supported = true; | |
268 | #ifdef TCP_KEEPALIVE_THRESHOLD | |
269 | support->idle_time_supported = true; | |
270 | #else | |
271 | support->idle_time_supported = false;; | |
272 | #endif /* TCP_KEEPALIVE_THRESHOLD */ | |
273 | ||
274 | /* | |
275 | * Solaris does not support either tcp_keepalive_probes or | |
276 | * tcp_keepalive_intvl. | |
277 | * Inferring a value for TCP_KEEP_ALIVE_ABORT_THRESHOLD using | |
278 | * (tcp_keepalive_probes * tcp_keepalive_intvl) could yield a good | |
279 | * alternative, but Solaris does not detail the algorithm used (such as | |
280 | * constant time retry like Linux). | |
281 | * | |
282 | * Ignore those settings on Solaris 11. We prefer exposing an | |
283 | * environment variable only used on Solaris for the abort threshold. | |
284 | */ | |
285 | support->probe_interval_supported = false; | |
286 | support->max_probe_count_supported = false; | |
287 | #ifdef TCP_KEEPALIVE_ABORT_THRESHOLD | |
288 | support->abort_threshold_supported = true; | |
289 | #else | |
290 | support->abort_threshold_supported = false; | |
291 | #endif /* TCP_KEEPALIVE_THRESHOLD */ | |
292 | } | |
293 | ||
294 | #else /* ! defined(__sun__) && ! defined(__linux__) */ | |
295 | ||
296 | /* Assume nothing is supported on other platforms. */ | |
297 | static | |
298 | void tcp_keep_alive_init_support(struct tcp_keep_alive_support *support) | |
299 | { | |
300 | support->supported = false; | |
301 | support->idle_time_supported = false; | |
302 | support->probe_interval_supported = false; | |
303 | support->max_probe_count_supported = false; | |
304 | support->abort_threshold_supported = false; | |
305 | } | |
306 | ||
307 | #endif /* ! defined(__sun__) && ! defined(__linux__) */ | |
308 | ||
309 | #ifdef __sun__ | |
310 | ||
311 | /* | |
312 | * Solaris specific modifier for abort threshold. | |
313 | * Return -2 on error. | |
314 | */ | |
315 | static | |
316 | int convert_abort_threshold(int value) | |
317 | { | |
318 | int ret; | |
319 | unsigned int tmp_ms; | |
320 | ||
321 | if (value == -1) { | |
322 | /* Use system defaults */ | |
323 | ret = value; | |
324 | goto end; | |
325 | } | |
326 | ||
327 | if (value < 0) { | |
328 | ERR("Invalid tcp keep-alive abort threshold (%i)", value); | |
329 | ret = -2; | |
330 | goto end; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Additional constraints for Solaris 11. | |
335 | * | |
336 | * Between 0 and 8 minutes. | |
337 | * https://docs.oracle.com/cd/E19120-01/open.solaris/819-2724/fsvdh/index.html | |
338 | * | |
339 | * Restrict from 1 seconds to 8 minutes sice the 0 value goes against | |
340 | * the purpose of dead peers detection by never timing out when probing. | |
341 | * It does NOT mean that the connection times out immediately. | |
342 | */ | |
343 | if ((value < SOLARIS_ABORT_THRESHOLD_MIN_S || value > SOLARIS_ABORT_THRESHOLD_MAX_S)) { | |
344 | ERR("%s must be comprised between %d and %d inclusively on Solaris", | |
345 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV, | |
346 | SOLARIS_ABORT_THRESHOLD_MIN_S, | |
347 | SOLARIS_ABORT_THRESHOLD_MAX_S); | |
348 | ret = -2; | |
349 | goto end; | |
350 | } | |
351 | ||
352 | /* Abort threshold is given in milliseconds. */ | |
353 | tmp_ms = ((unsigned int) value) * MSEC_PER_SEC; | |
354 | if ((value != 0 && (tmp_ms / ((unsigned int) value)) != MSEC_PER_SEC) | |
355 | || tmp_ms > INT_MAX) { | |
356 | /* Overflow */ | |
357 | const int max_value = INT_MAX / MSEC_PER_SEC; | |
358 | ||
359 | ERR("%s is too big: maximum supported value is %d", | |
360 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV, | |
361 | max_value); | |
362 | ret = -2; | |
363 | goto end; | |
364 | } | |
365 | ||
366 | /* tmp_ms is >= 0 and <= INT_MAX. Cast is safe. */ | |
367 | ret = (int) tmp_ms; | |
368 | end: | |
369 | return ret; | |
370 | } | |
371 | ||
372 | #else | |
373 | ||
374 | static | |
375 | int convert_abort_threshold(int value) | |
376 | { | |
377 | return value; | |
378 | } | |
379 | ||
380 | #endif /* defined (__sun__) */ | |
381 | ||
382 | /* | |
383 | * Retrieve settings from environment variables and warn for settings not | |
384 | * supported by the platform. | |
385 | */ | |
386 | static | |
387 | int tcp_keep_alive_init_config(struct tcp_keep_alive_support *support, | |
388 | struct tcp_keep_alive_config *config) | |
389 | { | |
390 | int ret; | |
391 | const char *value; | |
392 | ||
393 | value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ENV); | |
394 | if (!support->supported) { | |
395 | if (value) { | |
396 | WARN("Using per-socket TCP keep-alive mechanism is not supported by this platform. Ignoring the %s environment variable.", | |
397 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ENV); | |
398 | } | |
399 | config->enabled = false; | |
400 | } else if (value) { | |
401 | ret = config_parse_value(value); | |
402 | if (ret < 0 || ret > 1) { | |
403 | ERR("Invalid value for %s", DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ENV); | |
404 | ret = 1; | |
405 | goto error; | |
406 | } | |
407 | config->enabled = ret; | |
408 | } | |
409 | DBG("TCP keep-alive mechanism %s", config->enabled ? "enabled": "disabled"); | |
410 | ||
411 | /* Get value for tcp_keepalive_time in seconds. */ | |
412 | value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV); | |
413 | if (!support->idle_time_supported && value) { | |
414 | WARN("Overriding the TCP keep-alive idle time threshold per-socket is not supported by this platform. Ignoring the %s environment variable.", | |
415 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV); | |
416 | config->idle_time = -1; | |
417 | } else if (value) { | |
418 | int idle_time_platform; | |
419 | int idle_time_seconds; | |
420 | ||
421 | idle_time_seconds = get_env_int( | |
422 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV, | |
423 | value); | |
424 | if (idle_time_seconds < -1) { | |
425 | ret = 1; | |
426 | goto error; | |
427 | } | |
428 | ||
429 | idle_time_platform = convert_idle_time(idle_time_seconds); | |
430 | if (idle_time_platform < -1) { | |
431 | ret = 1; | |
432 | goto error; | |
433 | } | |
434 | ||
435 | config->idle_time = idle_time_platform; | |
436 | DBG("Overriding %s to %d", | |
437 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV, | |
438 | idle_time_seconds); | |
439 | } | |
440 | ||
441 | /* Get value for tcp_keepalive_intvl in seconds. */ | |
442 | value = lttng_secure_getenv( | |
443 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV); | |
444 | if (!support->probe_interval_supported && value) { | |
445 | WARN("Overriding the TCP keep-alive probe interval time per-socket is not supported by this platform. Ignoring the %s environment variable.", | |
446 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV); | |
447 | config->probe_interval = -1; | |
448 | } else if (value) { | |
449 | int probe_interval; | |
450 | ||
451 | probe_interval = get_env_int(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV, | |
452 | value); | |
453 | if (probe_interval < -1) { | |
454 | ret = 1; | |
455 | goto error; | |
456 | } | |
457 | ||
458 | config->probe_interval = probe_interval; | |
459 | DBG("Overriding %s to %d", | |
460 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV, | |
461 | config->probe_interval); | |
462 | } | |
463 | ||
464 | /* Get value for tcp_keepalive_probes. */ | |
465 | value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV); | |
466 | if (!support->max_probe_count_supported && value) { | |
467 | WARN("Overriding the TCP keep-alive maximum probe count per-socket is not supported by this platform. Ignoring the %s environment variable.", | |
468 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV); | |
469 | config->max_probe_count = -1; | |
470 | } else if (value) { | |
471 | int max_probe_count; | |
472 | ||
473 | max_probe_count = get_env_int(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV, | |
474 | value); | |
475 | if (max_probe_count < -1) { | |
476 | ret = 1; | |
477 | goto error; | |
478 | } | |
479 | ||
480 | config->max_probe_count = max_probe_count; | |
481 | DBG("Overriding %s to %d", | |
482 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV, | |
483 | config->max_probe_count); | |
484 | } | |
485 | ||
486 | /* Get value for tcp_keepalive_abort_interval. */ | |
487 | value = lttng_secure_getenv( | |
488 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV); | |
489 | if (!support->abort_threshold_supported && value) { | |
490 | WARN("Overriding the TCP keep-alive abort threshold per-socket is not supported by this platform. Ignoring the %s environment variable.", | |
491 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV); | |
492 | config->abort_threshold = -1; | |
493 | } else if (value) { | |
494 | int abort_threshold_platform; | |
495 | int abort_threshold_seconds; | |
496 | ||
497 | abort_threshold_seconds = get_env_int( | |
498 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV, | |
499 | value); | |
500 | if (abort_threshold_seconds < -1) { | |
501 | ret = 1; | |
502 | goto error; | |
503 | } | |
504 | ||
505 | abort_threshold_platform = convert_abort_threshold( | |
506 | abort_threshold_seconds); | |
507 | if (abort_threshold_platform < -1) { | |
508 | ret = 1; | |
509 | goto error; | |
510 | } | |
511 | ||
512 | config->abort_threshold = abort_threshold_platform; | |
513 | DBG("Overriding %s to %d", | |
514 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV, | |
515 | config->abort_threshold); | |
516 | } | |
517 | ||
518 | ret = 0; | |
519 | ||
520 | error: | |
521 | return ret; | |
522 | } | |
523 | ||
524 | /* Initialize the TCP keep-alive configuration. */ | |
525 | __attribute__((constructor)) static | |
526 | int tcp_keep_alive_init(void) | |
527 | { | |
528 | tcp_keep_alive_init_support(&support); | |
529 | return tcp_keep_alive_init_config(&support, &config); | |
530 | } | |
531 | ||
532 | /* | |
533 | * Set the socket options regarding TCP keep-alive. | |
534 | */ | |
535 | LTTNG_HIDDEN | |
536 | int socket_apply_keep_alive_config(int socket_fd) | |
537 | { | |
538 | int ret; | |
539 | int val = 1; | |
540 | ||
541 | /* TCP keep-alive */ | |
542 | if (!support.supported || !config.enabled ) { | |
543 | ret = 0; | |
544 | goto end; | |
545 | } | |
546 | ||
b8966fd2 | 547 | ret = setsockopt(socket_fd, SOL_SOCKET, SO_KEEPALIVE, &val, |
8af38ec0 JR |
548 | sizeof(val)); |
549 | if (ret < 0) { | |
550 | PERROR("setsockopt so_keepalive"); | |
551 | goto end; | |
552 | } | |
553 | ||
554 | /* TCP keep-alive idle time */ | |
555 | if (support.idle_time_supported && config.idle_time > 0) { | |
556 | ret = setsockopt(socket_fd, COMPAT_TCP_LEVEL, COMPAT_TCP_KEEPIDLE, &config.idle_time, | |
557 | sizeof(config.idle_time)); | |
558 | if (ret < 0) { | |
559 | PERROR("setsockopt TCP_KEEPIDLE"); | |
560 | goto end; | |
561 | } | |
562 | } | |
563 | /* TCP keep-alive probe interval */ | |
564 | if (support.probe_interval_supported && config.probe_interval > 0) { | |
565 | ret = setsockopt(socket_fd, COMPAT_TCP_LEVEL, COMPAT_TCP_KEEPINTVL, &config.probe_interval, | |
566 | sizeof(config.probe_interval)); | |
567 | if (ret < 0) { | |
568 | PERROR("setsockopt TCP_KEEPINTVL"); | |
569 | goto end; | |
570 | } | |
571 | } | |
572 | ||
573 | /* TCP keep-alive max probe count */ | |
574 | if (support.max_probe_count_supported && config.max_probe_count > 0) { | |
575 | ret = setsockopt(socket_fd, COMPAT_TCP_LEVEL, COMPAT_TCP_KEEPCNT, &config.max_probe_count, | |
576 | sizeof(config.max_probe_count)); | |
577 | if (ret < 0) { | |
578 | PERROR("setsockopt TCP_KEEPCNT"); | |
579 | goto end; | |
580 | } | |
581 | } | |
582 | ||
583 | /* TCP keep-alive abort threshold */ | |
584 | if (support.abort_threshold_supported && config.abort_threshold > 0) { | |
585 | ret = setsockopt(socket_fd, COMPAT_TCP_LEVEL, COMPAT_TCP_ABORT_THRESHOLD, &config.abort_threshold, | |
586 | sizeof(config.max_probe_count)); | |
587 | if (ret < 0) { | |
588 | PERROR("setsockopt TCP_KEEPALIVE_ABORT_THRESHOLD"); | |
589 | goto end; | |
590 | } | |
591 | } | |
592 | end: | |
593 | return ret; | |
594 | } |