| 1 | /* |
| 2 | * Copyright (C) 2017 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: GPL-2.0-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <sys/types.h> |
| 9 | #include <netinet/tcp.h> |
| 10 | #include <stdbool.h> |
| 11 | #include <sys/socket.h> |
| 12 | #include <limits.h> |
| 13 | |
| 14 | #include <common/compat/getenv.h> |
| 15 | #include <common/time.h> |
| 16 | #include <common/defaults.h> |
| 17 | #include <common/config/session-config.h> |
| 18 | |
| 19 | #include "tcp_keep_alive.h" |
| 20 | |
| 21 | #define SOLARIS_IDLE_TIME_MIN_S 10 |
| 22 | #define SOLARIS_IDLE_TIME_MAX_S 864000 /* 10 days */ |
| 23 | #define SOLARIS_ABORT_THRESHOLD_MIN_S 1 |
| 24 | #define SOLARIS_ABORT_THRESHOLD_MAX_S 480 /* 8 minutes */ |
| 25 | |
| 26 | /* Per-platform definitions of TCP socket options. */ |
| 27 | #if defined (__linux__) |
| 28 | |
| 29 | #define COMPAT_TCP_LEVEL SOL_TCP |
| 30 | #define COMPAT_TCP_ABORT_THRESHOLD 0 /* Does not exist on linux. */ |
| 31 | #define COMPAT_TCP_KEEPIDLE TCP_KEEPIDLE |
| 32 | #define COMPAT_TCP_KEEPINTVL TCP_KEEPINTVL |
| 33 | #define COMPAT_TCP_KEEPCNT TCP_KEEPCNT |
| 34 | |
| 35 | #elif defined (__sun__) /* ! defined (__linux__) */ |
| 36 | |
| 37 | #define COMPAT_TCP_LEVEL IPPROTO_TCP |
| 38 | |
| 39 | #ifdef TCP_KEEPALIVE_THRESHOLD |
| 40 | #define COMPAT_TCP_KEEPIDLE TCP_KEEPALIVE_THRESHOLD |
| 41 | #else /* ! defined (TCP_KEEPALIVE_THRESHOLD) */ |
| 42 | #define COMPAT_TCP_KEEPIDLE 0 |
| 43 | #endif /* TCP_KEEPALIVE_THRESHOLD */ |
| 44 | |
| 45 | #ifdef TCP_KEEPALIVE_ABORT_THRESHOLD |
| 46 | #define COMPAT_TCP_ABORT_THRESHOLD TCP_KEEPALIVE_ABORT_THRESHOLD |
| 47 | #else /* ! defined (TCP_KEEPALIVE_ABORT_THRESHOLD) */ |
| 48 | #define COMPAT_TCP_ABORT_THRESHOLD 0 |
| 49 | #endif /* TCP_KEEPALIVE_ABORT_THRESHOLD */ |
| 50 | |
| 51 | #define COMPAT_TCP_KEEPINTVL 0 /* Does not exist on Solaris. */ |
| 52 | #define COMPAT_TCP_KEEPCNT 0 /* Does not exist on Solaris. */ |
| 53 | |
| 54 | #else /* ! defined (__linux__) && ! defined (__sun__) */ |
| 55 | |
| 56 | #define COMPAT_TCP_LEVEL 0 |
| 57 | #define COMPAT_TCP_ABORT_THRESHOLD 0 |
| 58 | #define COMPAT_TCP_KEEPIDLE 0 |
| 59 | #define COMPAT_TCP_KEEPINTVL 0 |
| 60 | #define COMPAT_TCP_KEEPCNT 0 |
| 61 | |
| 62 | #endif /* ! defined (__linux__) && ! defined (__sun__) */ |
| 63 | |
| 64 | struct tcp_keep_alive_support { |
| 65 | /* TCP keep-alive is supported by this platform. */ |
| 66 | bool supported; |
| 67 | /* Overriding idle-time per socket is supported by this platform. */ |
| 68 | bool idle_time_supported; |
| 69 | /* |
| 70 | * Overriding probe interval per socket is supported by this |
| 71 | * platform. |
| 72 | */ |
| 73 | bool probe_interval_supported; |
| 74 | /* |
| 75 | * Configuring max probe count per socket is supported by this |
| 76 | * platform. |
| 77 | */ |
| 78 | bool max_probe_count_supported; |
| 79 | /* Overriding on a per-socket basis is supported by this platform. */ |
| 80 | bool abort_threshold_supported; |
| 81 | }; |
| 82 | |
| 83 | struct tcp_keep_alive_config { |
| 84 | /* Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_ENV environment variable. */ |
| 85 | bool enabled; |
| 86 | /* |
| 87 | * Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV environment |
| 88 | * variable. |
| 89 | */ |
| 90 | int idle_time; |
| 91 | /* |
| 92 | * Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV |
| 93 | * environment variable. |
| 94 | */ |
| 95 | int probe_interval; |
| 96 | /* |
| 97 | * Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV |
| 98 | * environment variable. |
| 99 | */ |
| 100 | int max_probe_count; |
| 101 | /* |
| 102 | * Maps to the LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV |
| 103 | * environment variable. |
| 104 | */ |
| 105 | int abort_threshold; |
| 106 | }; |
| 107 | |
| 108 | static struct tcp_keep_alive_config config = { |
| 109 | .enabled = false, |
| 110 | .idle_time = -1, |
| 111 | .probe_interval = -1, |
| 112 | .max_probe_count = -1, |
| 113 | .abort_threshold = -1 |
| 114 | }; |
| 115 | |
| 116 | static struct tcp_keep_alive_support support = { |
| 117 | .supported = false, |
| 118 | .idle_time_supported = false, |
| 119 | .probe_interval_supported = false, |
| 120 | .max_probe_count_supported = false, |
| 121 | .abort_threshold_supported = false |
| 122 | }; |
| 123 | |
| 124 | /* |
| 125 | * Common parser for string to positive int conversion where the value must be |
| 126 | * in range [-1, INT_MAX]. |
| 127 | * |
| 128 | * Returns -2 on invalid value. |
| 129 | */ |
| 130 | static |
| 131 | int get_env_int(const char *env_var, |
| 132 | const char *value) |
| 133 | { |
| 134 | int ret; |
| 135 | long tmp; |
| 136 | char *endptr = NULL; |
| 137 | |
| 138 | errno = 0; |
| 139 | tmp = strtol(value, &endptr, 0); |
| 140 | if (errno != 0) { |
| 141 | ERR("%s cannot be parsed.", env_var); |
| 142 | PERROR("errno for previous parsing failure"); |
| 143 | ret = -2; |
| 144 | goto end; |
| 145 | } |
| 146 | |
| 147 | if (endptr == value || *endptr != '\0') { |
| 148 | ERR("%s is not a valid number", env_var); |
| 149 | ret = -1; |
| 150 | goto end; |
| 151 | } |
| 152 | |
| 153 | if (tmp < -1) { |
| 154 | ERR("%s must be greater or equal to -1", env_var); |
| 155 | ret = -2; |
| 156 | goto end; |
| 157 | } |
| 158 | if (tmp > INT_MAX){ |
| 159 | ERR("%s is too big. Maximum value is %d", env_var, INT_MAX); |
| 160 | ret = -2; |
| 161 | goto end; |
| 162 | } |
| 163 | |
| 164 | ret = (int) tmp; |
| 165 | end: |
| 166 | return ret; |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * Per-platform implementation of tcp_keep_alive_idle_time_modifier. |
| 171 | * Returns -2 on invalid value. |
| 172 | */ |
| 173 | #ifdef __sun__ |
| 174 | |
| 175 | static |
| 176 | int convert_idle_time(int value) |
| 177 | { |
| 178 | int ret; |
| 179 | unsigned int tmp_ms; |
| 180 | |
| 181 | if (value == -1 || value == 0) { |
| 182 | /* Use system defaults */ |
| 183 | ret = value; |
| 184 | goto end; |
| 185 | } |
| 186 | |
| 187 | if (value < 0) { |
| 188 | ERR("Invalid tcp keep-alive idle time (%i)", value); |
| 189 | ret = -2; |
| 190 | goto end; |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Additional constraints for Solaris 11. |
| 195 | * Minimum 10s, maximum 10 days. Defined by |
| 196 | * https://docs.oracle.com/cd/E23824_01/html/821-1475/tcp-7p.html#REFMAN7tcp-7p |
| 197 | */ |
| 198 | if ((value < SOLARIS_IDLE_TIME_MIN_S || |
| 199 | value > SOLARIS_IDLE_TIME_MAX_S)) { |
| 200 | ERR("%s must be comprised between %d and %d inclusively on Solaris", |
| 201 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV, |
| 202 | SOLARIS_IDLE_TIME_MIN_S, |
| 203 | SOLARIS_IDLE_TIME_MAX_S); |
| 204 | ret = -2; |
| 205 | goto end; |
| 206 | } |
| 207 | |
| 208 | /* On Solaris idle time is given in milliseconds. */ |
| 209 | tmp_ms = ((unsigned int) value) * MSEC_PER_SEC; |
| 210 | if ((value != 0 && (tmp_ms / ((unsigned int) value)) != MSEC_PER_SEC) |
| 211 | || tmp_ms > INT_MAX) { |
| 212 | /* Overflow. */ |
| 213 | const int max_value = INT_MAX / MSEC_PER_SEC; |
| 214 | |
| 215 | ERR("%s is too big: maximum supported value is %d", |
| 216 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV, |
| 217 | max_value); |
| 218 | ret = -2; |
| 219 | goto end; |
| 220 | } |
| 221 | |
| 222 | /* tmp_ms is >= 0 and <= INT_MAX. Cast is safe. */ |
| 223 | ret = (int) tmp_ms; |
| 224 | end: |
| 225 | return ret; |
| 226 | } |
| 227 | |
| 228 | #else /* ! defined(__sun__) */ |
| 229 | |
| 230 | static |
| 231 | int convert_idle_time(int value) |
| 232 | { |
| 233 | return value; |
| 234 | } |
| 235 | |
| 236 | #endif /* ! defined(__sun__) */ |
| 237 | |
| 238 | /* Per-platform support of tcp_keep_alive functionality. */ |
| 239 | #if defined (__linux__) |
| 240 | |
| 241 | static |
| 242 | void tcp_keep_alive_init_support(struct tcp_keep_alive_support *support) |
| 243 | { |
| 244 | support->supported = true; |
| 245 | support->idle_time_supported = true; |
| 246 | support->probe_interval_supported = true; |
| 247 | support->max_probe_count_supported = true; |
| 248 | /* Solaris specific */ |
| 249 | support->abort_threshold_supported = false; |
| 250 | } |
| 251 | |
| 252 | #elif defined(__sun__) /* ! defined (__linux__) */ |
| 253 | |
| 254 | static |
| 255 | void tcp_keep_alive_init_support(struct tcp_keep_alive_support *support) |
| 256 | { |
| 257 | support->supported = true; |
| 258 | #ifdef TCP_KEEPALIVE_THRESHOLD |
| 259 | support->idle_time_supported = true; |
| 260 | #else |
| 261 | support->idle_time_supported = false;; |
| 262 | #endif /* TCP_KEEPALIVE_THRESHOLD */ |
| 263 | |
| 264 | /* |
| 265 | * Solaris does not support either tcp_keepalive_probes or |
| 266 | * tcp_keepalive_intvl. |
| 267 | * Inferring a value for TCP_KEEP_ALIVE_ABORT_THRESHOLD using |
| 268 | * (tcp_keepalive_probes * tcp_keepalive_intvl) could yield a good |
| 269 | * alternative, but Solaris does not detail the algorithm used (such as |
| 270 | * constant time retry like Linux). |
| 271 | * |
| 272 | * Ignore those settings on Solaris 11. We prefer exposing an |
| 273 | * environment variable only used on Solaris for the abort threshold. |
| 274 | */ |
| 275 | support->probe_interval_supported = false; |
| 276 | support->max_probe_count_supported = false; |
| 277 | #ifdef TCP_KEEPALIVE_ABORT_THRESHOLD |
| 278 | support->abort_threshold_supported = true; |
| 279 | #else |
| 280 | support->abort_threshold_supported = false; |
| 281 | #endif /* TCP_KEEPALIVE_THRESHOLD */ |
| 282 | } |
| 283 | |
| 284 | #else /* ! defined(__sun__) && ! defined(__linux__) */ |
| 285 | |
| 286 | /* Assume nothing is supported on other platforms. */ |
| 287 | static |
| 288 | void tcp_keep_alive_init_support(struct tcp_keep_alive_support *support) |
| 289 | { |
| 290 | support->supported = false; |
| 291 | support->idle_time_supported = false; |
| 292 | support->probe_interval_supported = false; |
| 293 | support->max_probe_count_supported = false; |
| 294 | support->abort_threshold_supported = false; |
| 295 | } |
| 296 | |
| 297 | #endif /* ! defined(__sun__) && ! defined(__linux__) */ |
| 298 | |
| 299 | #ifdef __sun__ |
| 300 | |
| 301 | /* |
| 302 | * Solaris specific modifier for abort threshold. |
| 303 | * Return -2 on error. |
| 304 | */ |
| 305 | static |
| 306 | int convert_abort_threshold(int value) |
| 307 | { |
| 308 | int ret; |
| 309 | unsigned int tmp_ms; |
| 310 | |
| 311 | if (value == -1) { |
| 312 | /* Use system defaults */ |
| 313 | ret = value; |
| 314 | goto end; |
| 315 | } |
| 316 | |
| 317 | if (value < 0) { |
| 318 | ERR("Invalid tcp keep-alive abort threshold (%i)", value); |
| 319 | ret = -2; |
| 320 | goto end; |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | * Additional constraints for Solaris 11. |
| 325 | * |
| 326 | * Between 0 and 8 minutes. |
| 327 | * https://docs.oracle.com/cd/E19120-01/open.solaris/819-2724/fsvdh/index.html |
| 328 | * |
| 329 | * Restrict from 1 seconds to 8 minutes sice the 0 value goes against |
| 330 | * the purpose of dead peers detection by never timing out when probing. |
| 331 | * It does NOT mean that the connection times out immediately. |
| 332 | */ |
| 333 | if ((value < SOLARIS_ABORT_THRESHOLD_MIN_S || value > SOLARIS_ABORT_THRESHOLD_MAX_S)) { |
| 334 | ERR("%s must be comprised between %d and %d inclusively on Solaris", |
| 335 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV, |
| 336 | SOLARIS_ABORT_THRESHOLD_MIN_S, |
| 337 | SOLARIS_ABORT_THRESHOLD_MAX_S); |
| 338 | ret = -2; |
| 339 | goto end; |
| 340 | } |
| 341 | |
| 342 | /* Abort threshold is given in milliseconds. */ |
| 343 | tmp_ms = ((unsigned int) value) * MSEC_PER_SEC; |
| 344 | if ((value != 0 && (tmp_ms / ((unsigned int) value)) != MSEC_PER_SEC) |
| 345 | || tmp_ms > INT_MAX) { |
| 346 | /* Overflow */ |
| 347 | const int max_value = INT_MAX / MSEC_PER_SEC; |
| 348 | |
| 349 | ERR("%s is too big: maximum supported value is %d", |
| 350 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV, |
| 351 | max_value); |
| 352 | ret = -2; |
| 353 | goto end; |
| 354 | } |
| 355 | |
| 356 | /* tmp_ms is >= 0 and <= INT_MAX. Cast is safe. */ |
| 357 | ret = (int) tmp_ms; |
| 358 | end: |
| 359 | return ret; |
| 360 | } |
| 361 | |
| 362 | #else |
| 363 | |
| 364 | static |
| 365 | int convert_abort_threshold(int value) |
| 366 | { |
| 367 | return value; |
| 368 | } |
| 369 | |
| 370 | #endif /* defined (__sun__) */ |
| 371 | |
| 372 | /* |
| 373 | * Retrieve settings from environment variables and warn for settings not |
| 374 | * supported by the platform. |
| 375 | */ |
| 376 | static |
| 377 | int tcp_keep_alive_init_config(struct tcp_keep_alive_support *support, |
| 378 | struct tcp_keep_alive_config *config) |
| 379 | { |
| 380 | int ret; |
| 381 | const char *value; |
| 382 | |
| 383 | value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ENV); |
| 384 | if (!support->supported) { |
| 385 | if (value) { |
| 386 | WARN("Using per-socket TCP keep-alive mechanism is not supported by this platform. Ignoring the %s environment variable.", |
| 387 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ENV); |
| 388 | } |
| 389 | config->enabled = false; |
| 390 | } else if (value) { |
| 391 | ret = config_parse_value(value); |
| 392 | if (ret < 0 || ret > 1) { |
| 393 | ERR("Invalid value for %s", DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ENV); |
| 394 | ret = 1; |
| 395 | goto error; |
| 396 | } |
| 397 | config->enabled = ret; |
| 398 | } |
| 399 | DBG("TCP keep-alive mechanism %s", config->enabled ? "enabled": "disabled"); |
| 400 | |
| 401 | /* Get value for tcp_keepalive_time in seconds. */ |
| 402 | value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV); |
| 403 | if (!support->idle_time_supported && value) { |
| 404 | WARN("Overriding the TCP keep-alive idle time threshold per-socket is not supported by this platform. Ignoring the %s environment variable.", |
| 405 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV); |
| 406 | config->idle_time = -1; |
| 407 | } else if (value) { |
| 408 | int idle_time_platform; |
| 409 | int idle_time_seconds; |
| 410 | |
| 411 | idle_time_seconds = get_env_int( |
| 412 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV, |
| 413 | value); |
| 414 | if (idle_time_seconds < -1) { |
| 415 | ret = 1; |
| 416 | goto error; |
| 417 | } |
| 418 | |
| 419 | idle_time_platform = convert_idle_time(idle_time_seconds); |
| 420 | if (idle_time_platform < -1) { |
| 421 | ret = 1; |
| 422 | goto error; |
| 423 | } |
| 424 | |
| 425 | config->idle_time = idle_time_platform; |
| 426 | DBG("Overriding %s to %d", |
| 427 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_IDLE_TIME_ENV, |
| 428 | idle_time_seconds); |
| 429 | } |
| 430 | |
| 431 | /* Get value for tcp_keepalive_intvl in seconds. */ |
| 432 | value = lttng_secure_getenv( |
| 433 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV); |
| 434 | if (!support->probe_interval_supported && value) { |
| 435 | WARN("Overriding the TCP keep-alive probe interval time per-socket is not supported by this platform. Ignoring the %s environment variable.", |
| 436 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV); |
| 437 | config->probe_interval = -1; |
| 438 | } else if (value) { |
| 439 | int probe_interval; |
| 440 | |
| 441 | probe_interval = get_env_int(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV, |
| 442 | value); |
| 443 | if (probe_interval < -1) { |
| 444 | ret = 1; |
| 445 | goto error; |
| 446 | } |
| 447 | |
| 448 | config->probe_interval = probe_interval; |
| 449 | DBG("Overriding %s to %d", |
| 450 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_PROBE_INTERVAL_ENV, |
| 451 | config->probe_interval); |
| 452 | } |
| 453 | |
| 454 | /* Get value for tcp_keepalive_probes. */ |
| 455 | value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV); |
| 456 | if (!support->max_probe_count_supported && value) { |
| 457 | WARN("Overriding the TCP keep-alive maximum probe count per-socket is not supported by this platform. Ignoring the %s environment variable.", |
| 458 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV); |
| 459 | config->max_probe_count = -1; |
| 460 | } else if (value) { |
| 461 | int max_probe_count; |
| 462 | |
| 463 | max_probe_count = get_env_int(DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV, |
| 464 | value); |
| 465 | if (max_probe_count < -1) { |
| 466 | ret = 1; |
| 467 | goto error; |
| 468 | } |
| 469 | |
| 470 | config->max_probe_count = max_probe_count; |
| 471 | DBG("Overriding %s to %d", |
| 472 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV, |
| 473 | config->max_probe_count); |
| 474 | } |
| 475 | |
| 476 | /* Get value for tcp_keepalive_abort_interval. */ |
| 477 | value = lttng_secure_getenv( |
| 478 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV); |
| 479 | if (!support->abort_threshold_supported && value) { |
| 480 | WARN("Overriding the TCP keep-alive abort threshold per-socket is not supported by this platform. Ignoring the %s environment variable.", |
| 481 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV); |
| 482 | config->abort_threshold = -1; |
| 483 | } else if (value) { |
| 484 | int abort_threshold_platform; |
| 485 | int abort_threshold_seconds; |
| 486 | |
| 487 | abort_threshold_seconds = get_env_int( |
| 488 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_MAX_PROBE_COUNT_ENV, |
| 489 | value); |
| 490 | if (abort_threshold_seconds < -1) { |
| 491 | ret = 1; |
| 492 | goto error; |
| 493 | } |
| 494 | |
| 495 | abort_threshold_platform = convert_abort_threshold( |
| 496 | abort_threshold_seconds); |
| 497 | if (abort_threshold_platform < -1) { |
| 498 | ret = 1; |
| 499 | goto error; |
| 500 | } |
| 501 | |
| 502 | config->abort_threshold = abort_threshold_platform; |
| 503 | DBG("Overriding %s to %d", |
| 504 | DEFAULT_LTTNG_RELAYD_TCP_KEEP_ALIVE_ABORT_THRESHOLD_ENV, |
| 505 | config->abort_threshold); |
| 506 | } |
| 507 | |
| 508 | ret = 0; |
| 509 | |
| 510 | error: |
| 511 | return ret; |
| 512 | } |
| 513 | |
| 514 | /* Initialize the TCP keep-alive configuration. */ |
| 515 | __attribute__((constructor)) static |
| 516 | void tcp_keep_alive_init(void) |
| 517 | { |
| 518 | tcp_keep_alive_init_support(&support); |
| 519 | (void) tcp_keep_alive_init_config(&support, &config); |
| 520 | } |
| 521 | |
| 522 | /* |
| 523 | * Set the socket options regarding TCP keep-alive. |
| 524 | */ |
| 525 | LTTNG_HIDDEN |
| 526 | int socket_apply_keep_alive_config(int socket_fd) |
| 527 | { |
| 528 | int ret; |
| 529 | int val = 1; |
| 530 | |
| 531 | /* TCP keep-alive */ |
| 532 | if (!support.supported || !config.enabled ) { |
| 533 | ret = 0; |
| 534 | goto end; |
| 535 | } |
| 536 | |
| 537 | DBG("TCP keep-alive enabled for socket %d", socket_fd); |
| 538 | ret = setsockopt(socket_fd, SOL_SOCKET, SO_KEEPALIVE, &val, |
| 539 | sizeof(val)); |
| 540 | if (ret < 0) { |
| 541 | PERROR("setsockopt so_keepalive"); |
| 542 | goto end; |
| 543 | } |
| 544 | |
| 545 | /* TCP keep-alive idle time */ |
| 546 | if (support.idle_time_supported && config.idle_time > 0) { |
| 547 | DBG("TCP keep-alive keep idle: %d enabled for socket %d", config.idle_time, socket_fd); |
| 548 | ret = setsockopt(socket_fd, COMPAT_TCP_LEVEL, COMPAT_TCP_KEEPIDLE, &config.idle_time, |
| 549 | sizeof(config.idle_time)); |
| 550 | if (ret < 0) { |
| 551 | PERROR("setsockopt TCP_KEEPIDLE"); |
| 552 | goto end; |
| 553 | } |
| 554 | } |
| 555 | /* TCP keep-alive probe interval */ |
| 556 | if (support.probe_interval_supported && config.probe_interval > 0) { |
| 557 | DBG("TCP keep-alive probe_interval: %d enabled for socket %d", config.probe_interval, socket_fd); |
| 558 | ret = setsockopt(socket_fd, COMPAT_TCP_LEVEL, COMPAT_TCP_KEEPINTVL, &config.probe_interval, |
| 559 | sizeof(config.probe_interval)); |
| 560 | if (ret < 0) { |
| 561 | PERROR("setsockopt TCP_KEEPINTVL"); |
| 562 | goto end; |
| 563 | } |
| 564 | } |
| 565 | |
| 566 | /* TCP keep-alive max probe count */ |
| 567 | if (support.max_probe_count_supported && config.max_probe_count > 0) { |
| 568 | DBG("TCP keep-alive max_probe: %d enabled for socket %d", config.max_probe_count, socket_fd); |
| 569 | ret = setsockopt(socket_fd, COMPAT_TCP_LEVEL, COMPAT_TCP_KEEPCNT, &config.max_probe_count, |
| 570 | sizeof(config.max_probe_count)); |
| 571 | if (ret < 0) { |
| 572 | PERROR("setsockopt TCP_KEEPCNT"); |
| 573 | goto end; |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | /* TCP keep-alive abort threshold */ |
| 578 | if (support.abort_threshold_supported && config.abort_threshold > 0) { |
| 579 | DBG("TCP keep-alive abort threshold: %d enabled for socket %d", config.abort_threshold, socket_fd); |
| 580 | ret = setsockopt(socket_fd, COMPAT_TCP_LEVEL, COMPAT_TCP_ABORT_THRESHOLD, &config.abort_threshold, |
| 581 | sizeof(config.max_probe_count)); |
| 582 | if (ret < 0) { |
| 583 | PERROR("setsockopt TCP_KEEPALIVE_ABORT_THRESHOLD"); |
| 584 | goto end; |
| 585 | } |
| 586 | } |
| 587 | end: |
| 588 | return ret; |
| 589 | } |