| 1 | /* |
| 2 | * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem. |
| 3 | * |
| 4 | * Begun April 1, 1996, Mike Shaver. |
| 5 | * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS] |
| 6 | */ |
| 7 | |
| 8 | #include <linux/mm.h> |
| 9 | #include <linux/module.h> |
| 10 | #include <linux/sysctl.h> |
| 11 | #include <linux/igmp.h> |
| 12 | #include <linux/inetdevice.h> |
| 13 | #include <linux/seqlock.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <net/snmp.h> |
| 17 | #include <net/icmp.h> |
| 18 | #include <net/ip.h> |
| 19 | #include <net/route.h> |
| 20 | #include <net/tcp.h> |
| 21 | #include <net/udp.h> |
| 22 | #include <net/cipso_ipv4.h> |
| 23 | #include <net/inet_frag.h> |
| 24 | |
| 25 | static int zero; |
| 26 | static int tcp_retr1_max = 255; |
| 27 | static int ip_local_port_range_min[] = { 1, 1 }; |
| 28 | static int ip_local_port_range_max[] = { 65535, 65535 }; |
| 29 | |
| 30 | /* Update system visible IP port range */ |
| 31 | static void set_local_port_range(int range[2]) |
| 32 | { |
| 33 | write_seqlock(&sysctl_local_ports.lock); |
| 34 | sysctl_local_ports.range[0] = range[0]; |
| 35 | sysctl_local_ports.range[1] = range[1]; |
| 36 | write_sequnlock(&sysctl_local_ports.lock); |
| 37 | } |
| 38 | |
| 39 | /* Validate changes from /proc interface. */ |
| 40 | static int ipv4_local_port_range(ctl_table *table, int write, |
| 41 | void __user *buffer, |
| 42 | size_t *lenp, loff_t *ppos) |
| 43 | { |
| 44 | int ret; |
| 45 | int range[2]; |
| 46 | ctl_table tmp = { |
| 47 | .data = &range, |
| 48 | .maxlen = sizeof(range), |
| 49 | .mode = table->mode, |
| 50 | .extra1 = &ip_local_port_range_min, |
| 51 | .extra2 = &ip_local_port_range_max, |
| 52 | }; |
| 53 | |
| 54 | inet_get_local_port_range(range, range + 1); |
| 55 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
| 56 | |
| 57 | if (write && ret == 0) { |
| 58 | if (range[1] < range[0]) |
| 59 | ret = -EINVAL; |
| 60 | else |
| 61 | set_local_port_range(range); |
| 62 | } |
| 63 | |
| 64 | return ret; |
| 65 | } |
| 66 | |
| 67 | static int proc_tcp_congestion_control(ctl_table *ctl, int write, |
| 68 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 69 | { |
| 70 | char val[TCP_CA_NAME_MAX]; |
| 71 | ctl_table tbl = { |
| 72 | .data = val, |
| 73 | .maxlen = TCP_CA_NAME_MAX, |
| 74 | }; |
| 75 | int ret; |
| 76 | |
| 77 | tcp_get_default_congestion_control(val); |
| 78 | |
| 79 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); |
| 80 | if (write && ret == 0) |
| 81 | ret = tcp_set_default_congestion_control(val); |
| 82 | return ret; |
| 83 | } |
| 84 | |
| 85 | static int proc_tcp_available_congestion_control(ctl_table *ctl, |
| 86 | int write, |
| 87 | void __user *buffer, size_t *lenp, |
| 88 | loff_t *ppos) |
| 89 | { |
| 90 | ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, }; |
| 91 | int ret; |
| 92 | |
| 93 | tbl.data = kmalloc(tbl.maxlen, GFP_USER); |
| 94 | if (!tbl.data) |
| 95 | return -ENOMEM; |
| 96 | tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX); |
| 97 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); |
| 98 | kfree(tbl.data); |
| 99 | return ret; |
| 100 | } |
| 101 | |
| 102 | static int proc_allowed_congestion_control(ctl_table *ctl, |
| 103 | int write, |
| 104 | void __user *buffer, size_t *lenp, |
| 105 | loff_t *ppos) |
| 106 | { |
| 107 | ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX }; |
| 108 | int ret; |
| 109 | |
| 110 | tbl.data = kmalloc(tbl.maxlen, GFP_USER); |
| 111 | if (!tbl.data) |
| 112 | return -ENOMEM; |
| 113 | |
| 114 | tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen); |
| 115 | ret = proc_dostring(&tbl, write, buffer, lenp, ppos); |
| 116 | if (write && ret == 0) |
| 117 | ret = tcp_set_allowed_congestion_control(tbl.data); |
| 118 | kfree(tbl.data); |
| 119 | return ret; |
| 120 | } |
| 121 | |
| 122 | static struct ctl_table ipv4_table[] = { |
| 123 | { |
| 124 | .procname = "tcp_timestamps", |
| 125 | .data = &sysctl_tcp_timestamps, |
| 126 | .maxlen = sizeof(int), |
| 127 | .mode = 0644, |
| 128 | .proc_handler = proc_dointvec |
| 129 | }, |
| 130 | { |
| 131 | .procname = "tcp_window_scaling", |
| 132 | .data = &sysctl_tcp_window_scaling, |
| 133 | .maxlen = sizeof(int), |
| 134 | .mode = 0644, |
| 135 | .proc_handler = proc_dointvec |
| 136 | }, |
| 137 | { |
| 138 | .procname = "tcp_sack", |
| 139 | .data = &sysctl_tcp_sack, |
| 140 | .maxlen = sizeof(int), |
| 141 | .mode = 0644, |
| 142 | .proc_handler = proc_dointvec |
| 143 | }, |
| 144 | { |
| 145 | .procname = "tcp_retrans_collapse", |
| 146 | .data = &sysctl_tcp_retrans_collapse, |
| 147 | .maxlen = sizeof(int), |
| 148 | .mode = 0644, |
| 149 | .proc_handler = proc_dointvec |
| 150 | }, |
| 151 | { |
| 152 | .procname = "ip_default_ttl", |
| 153 | .data = &sysctl_ip_default_ttl, |
| 154 | .maxlen = sizeof(int), |
| 155 | .mode = 0644, |
| 156 | .proc_handler = ipv4_doint_and_flush, |
| 157 | .extra2 = &init_net, |
| 158 | }, |
| 159 | { |
| 160 | .procname = "ip_no_pmtu_disc", |
| 161 | .data = &ipv4_config.no_pmtu_disc, |
| 162 | .maxlen = sizeof(int), |
| 163 | .mode = 0644, |
| 164 | .proc_handler = proc_dointvec |
| 165 | }, |
| 166 | { |
| 167 | .procname = "ip_nonlocal_bind", |
| 168 | .data = &sysctl_ip_nonlocal_bind, |
| 169 | .maxlen = sizeof(int), |
| 170 | .mode = 0644, |
| 171 | .proc_handler = proc_dointvec |
| 172 | }, |
| 173 | { |
| 174 | .procname = "tcp_syn_retries", |
| 175 | .data = &sysctl_tcp_syn_retries, |
| 176 | .maxlen = sizeof(int), |
| 177 | .mode = 0644, |
| 178 | .proc_handler = proc_dointvec |
| 179 | }, |
| 180 | { |
| 181 | .procname = "tcp_synack_retries", |
| 182 | .data = &sysctl_tcp_synack_retries, |
| 183 | .maxlen = sizeof(int), |
| 184 | .mode = 0644, |
| 185 | .proc_handler = proc_dointvec |
| 186 | }, |
| 187 | { |
| 188 | .procname = "tcp_max_orphans", |
| 189 | .data = &sysctl_tcp_max_orphans, |
| 190 | .maxlen = sizeof(int), |
| 191 | .mode = 0644, |
| 192 | .proc_handler = proc_dointvec |
| 193 | }, |
| 194 | { |
| 195 | .procname = "tcp_max_tw_buckets", |
| 196 | .data = &tcp_death_row.sysctl_max_tw_buckets, |
| 197 | .maxlen = sizeof(int), |
| 198 | .mode = 0644, |
| 199 | .proc_handler = proc_dointvec |
| 200 | }, |
| 201 | { |
| 202 | .procname = "ip_dynaddr", |
| 203 | .data = &sysctl_ip_dynaddr, |
| 204 | .maxlen = sizeof(int), |
| 205 | .mode = 0644, |
| 206 | .proc_handler = proc_dointvec |
| 207 | }, |
| 208 | { |
| 209 | .procname = "tcp_keepalive_time", |
| 210 | .data = &sysctl_tcp_keepalive_time, |
| 211 | .maxlen = sizeof(int), |
| 212 | .mode = 0644, |
| 213 | .proc_handler = proc_dointvec_jiffies, |
| 214 | }, |
| 215 | { |
| 216 | .procname = "tcp_keepalive_probes", |
| 217 | .data = &sysctl_tcp_keepalive_probes, |
| 218 | .maxlen = sizeof(int), |
| 219 | .mode = 0644, |
| 220 | .proc_handler = proc_dointvec |
| 221 | }, |
| 222 | { |
| 223 | .procname = "tcp_keepalive_intvl", |
| 224 | .data = &sysctl_tcp_keepalive_intvl, |
| 225 | .maxlen = sizeof(int), |
| 226 | .mode = 0644, |
| 227 | .proc_handler = proc_dointvec_jiffies, |
| 228 | }, |
| 229 | { |
| 230 | .procname = "tcp_retries1", |
| 231 | .data = &sysctl_tcp_retries1, |
| 232 | .maxlen = sizeof(int), |
| 233 | .mode = 0644, |
| 234 | .proc_handler = proc_dointvec_minmax, |
| 235 | .extra2 = &tcp_retr1_max |
| 236 | }, |
| 237 | { |
| 238 | .procname = "tcp_retries2", |
| 239 | .data = &sysctl_tcp_retries2, |
| 240 | .maxlen = sizeof(int), |
| 241 | .mode = 0644, |
| 242 | .proc_handler = proc_dointvec |
| 243 | }, |
| 244 | { |
| 245 | .procname = "tcp_fin_timeout", |
| 246 | .data = &sysctl_tcp_fin_timeout, |
| 247 | .maxlen = sizeof(int), |
| 248 | .mode = 0644, |
| 249 | .proc_handler = proc_dointvec_jiffies, |
| 250 | }, |
| 251 | #ifdef CONFIG_SYN_COOKIES |
| 252 | { |
| 253 | .procname = "tcp_syncookies", |
| 254 | .data = &sysctl_tcp_syncookies, |
| 255 | .maxlen = sizeof(int), |
| 256 | .mode = 0644, |
| 257 | .proc_handler = proc_dointvec |
| 258 | }, |
| 259 | #endif |
| 260 | { |
| 261 | .procname = "tcp_tw_recycle", |
| 262 | .data = &tcp_death_row.sysctl_tw_recycle, |
| 263 | .maxlen = sizeof(int), |
| 264 | .mode = 0644, |
| 265 | .proc_handler = proc_dointvec |
| 266 | }, |
| 267 | { |
| 268 | .procname = "tcp_abort_on_overflow", |
| 269 | .data = &sysctl_tcp_abort_on_overflow, |
| 270 | .maxlen = sizeof(int), |
| 271 | .mode = 0644, |
| 272 | .proc_handler = proc_dointvec |
| 273 | }, |
| 274 | { |
| 275 | .procname = "tcp_stdurg", |
| 276 | .data = &sysctl_tcp_stdurg, |
| 277 | .maxlen = sizeof(int), |
| 278 | .mode = 0644, |
| 279 | .proc_handler = proc_dointvec |
| 280 | }, |
| 281 | { |
| 282 | .procname = "tcp_rfc1337", |
| 283 | .data = &sysctl_tcp_rfc1337, |
| 284 | .maxlen = sizeof(int), |
| 285 | .mode = 0644, |
| 286 | .proc_handler = proc_dointvec |
| 287 | }, |
| 288 | { |
| 289 | .procname = "tcp_max_syn_backlog", |
| 290 | .data = &sysctl_max_syn_backlog, |
| 291 | .maxlen = sizeof(int), |
| 292 | .mode = 0644, |
| 293 | .proc_handler = proc_dointvec |
| 294 | }, |
| 295 | { |
| 296 | .procname = "ip_local_port_range", |
| 297 | .data = &sysctl_local_ports.range, |
| 298 | .maxlen = sizeof(sysctl_local_ports.range), |
| 299 | .mode = 0644, |
| 300 | .proc_handler = ipv4_local_port_range, |
| 301 | }, |
| 302 | #ifdef CONFIG_IP_MULTICAST |
| 303 | { |
| 304 | .procname = "igmp_max_memberships", |
| 305 | .data = &sysctl_igmp_max_memberships, |
| 306 | .maxlen = sizeof(int), |
| 307 | .mode = 0644, |
| 308 | .proc_handler = proc_dointvec |
| 309 | }, |
| 310 | |
| 311 | #endif |
| 312 | { |
| 313 | .procname = "igmp_max_msf", |
| 314 | .data = &sysctl_igmp_max_msf, |
| 315 | .maxlen = sizeof(int), |
| 316 | .mode = 0644, |
| 317 | .proc_handler = proc_dointvec |
| 318 | }, |
| 319 | { |
| 320 | .procname = "inet_peer_threshold", |
| 321 | .data = &inet_peer_threshold, |
| 322 | .maxlen = sizeof(int), |
| 323 | .mode = 0644, |
| 324 | .proc_handler = proc_dointvec |
| 325 | }, |
| 326 | { |
| 327 | .procname = "inet_peer_minttl", |
| 328 | .data = &inet_peer_minttl, |
| 329 | .maxlen = sizeof(int), |
| 330 | .mode = 0644, |
| 331 | .proc_handler = proc_dointvec_jiffies, |
| 332 | }, |
| 333 | { |
| 334 | .procname = "inet_peer_maxttl", |
| 335 | .data = &inet_peer_maxttl, |
| 336 | .maxlen = sizeof(int), |
| 337 | .mode = 0644, |
| 338 | .proc_handler = proc_dointvec_jiffies, |
| 339 | }, |
| 340 | { |
| 341 | .procname = "inet_peer_gc_mintime", |
| 342 | .data = &inet_peer_gc_mintime, |
| 343 | .maxlen = sizeof(int), |
| 344 | .mode = 0644, |
| 345 | .proc_handler = proc_dointvec_jiffies, |
| 346 | }, |
| 347 | { |
| 348 | .procname = "inet_peer_gc_maxtime", |
| 349 | .data = &inet_peer_gc_maxtime, |
| 350 | .maxlen = sizeof(int), |
| 351 | .mode = 0644, |
| 352 | .proc_handler = proc_dointvec_jiffies, |
| 353 | }, |
| 354 | { |
| 355 | .procname = "tcp_orphan_retries", |
| 356 | .data = &sysctl_tcp_orphan_retries, |
| 357 | .maxlen = sizeof(int), |
| 358 | .mode = 0644, |
| 359 | .proc_handler = proc_dointvec |
| 360 | }, |
| 361 | { |
| 362 | .procname = "tcp_fack", |
| 363 | .data = &sysctl_tcp_fack, |
| 364 | .maxlen = sizeof(int), |
| 365 | .mode = 0644, |
| 366 | .proc_handler = proc_dointvec |
| 367 | }, |
| 368 | { |
| 369 | .procname = "tcp_reordering", |
| 370 | .data = &sysctl_tcp_reordering, |
| 371 | .maxlen = sizeof(int), |
| 372 | .mode = 0644, |
| 373 | .proc_handler = proc_dointvec |
| 374 | }, |
| 375 | { |
| 376 | .procname = "tcp_ecn", |
| 377 | .data = &sysctl_tcp_ecn, |
| 378 | .maxlen = sizeof(int), |
| 379 | .mode = 0644, |
| 380 | .proc_handler = proc_dointvec |
| 381 | }, |
| 382 | { |
| 383 | .procname = "tcp_dsack", |
| 384 | .data = &sysctl_tcp_dsack, |
| 385 | .maxlen = sizeof(int), |
| 386 | .mode = 0644, |
| 387 | .proc_handler = proc_dointvec |
| 388 | }, |
| 389 | { |
| 390 | .procname = "tcp_mem", |
| 391 | .data = &sysctl_tcp_mem, |
| 392 | .maxlen = sizeof(sysctl_tcp_mem), |
| 393 | .mode = 0644, |
| 394 | .proc_handler = proc_dointvec |
| 395 | }, |
| 396 | { |
| 397 | .procname = "tcp_wmem", |
| 398 | .data = &sysctl_tcp_wmem, |
| 399 | .maxlen = sizeof(sysctl_tcp_wmem), |
| 400 | .mode = 0644, |
| 401 | .proc_handler = proc_dointvec |
| 402 | }, |
| 403 | { |
| 404 | .procname = "tcp_rmem", |
| 405 | .data = &sysctl_tcp_rmem, |
| 406 | .maxlen = sizeof(sysctl_tcp_rmem), |
| 407 | .mode = 0644, |
| 408 | .proc_handler = proc_dointvec |
| 409 | }, |
| 410 | { |
| 411 | .procname = "tcp_app_win", |
| 412 | .data = &sysctl_tcp_app_win, |
| 413 | .maxlen = sizeof(int), |
| 414 | .mode = 0644, |
| 415 | .proc_handler = proc_dointvec |
| 416 | }, |
| 417 | { |
| 418 | .procname = "tcp_adv_win_scale", |
| 419 | .data = &sysctl_tcp_adv_win_scale, |
| 420 | .maxlen = sizeof(int), |
| 421 | .mode = 0644, |
| 422 | .proc_handler = proc_dointvec |
| 423 | }, |
| 424 | { |
| 425 | .procname = "tcp_tw_reuse", |
| 426 | .data = &sysctl_tcp_tw_reuse, |
| 427 | .maxlen = sizeof(int), |
| 428 | .mode = 0644, |
| 429 | .proc_handler = proc_dointvec |
| 430 | }, |
| 431 | { |
| 432 | .procname = "tcp_frto", |
| 433 | .data = &sysctl_tcp_frto, |
| 434 | .maxlen = sizeof(int), |
| 435 | .mode = 0644, |
| 436 | .proc_handler = proc_dointvec |
| 437 | }, |
| 438 | { |
| 439 | .procname = "tcp_frto_response", |
| 440 | .data = &sysctl_tcp_frto_response, |
| 441 | .maxlen = sizeof(int), |
| 442 | .mode = 0644, |
| 443 | .proc_handler = proc_dointvec |
| 444 | }, |
| 445 | { |
| 446 | .procname = "tcp_low_latency", |
| 447 | .data = &sysctl_tcp_low_latency, |
| 448 | .maxlen = sizeof(int), |
| 449 | .mode = 0644, |
| 450 | .proc_handler = proc_dointvec |
| 451 | }, |
| 452 | { |
| 453 | .procname = "tcp_no_metrics_save", |
| 454 | .data = &sysctl_tcp_nometrics_save, |
| 455 | .maxlen = sizeof(int), |
| 456 | .mode = 0644, |
| 457 | .proc_handler = proc_dointvec, |
| 458 | }, |
| 459 | { |
| 460 | .procname = "tcp_moderate_rcvbuf", |
| 461 | .data = &sysctl_tcp_moderate_rcvbuf, |
| 462 | .maxlen = sizeof(int), |
| 463 | .mode = 0644, |
| 464 | .proc_handler = proc_dointvec, |
| 465 | }, |
| 466 | { |
| 467 | .procname = "tcp_tso_win_divisor", |
| 468 | .data = &sysctl_tcp_tso_win_divisor, |
| 469 | .maxlen = sizeof(int), |
| 470 | .mode = 0644, |
| 471 | .proc_handler = proc_dointvec, |
| 472 | }, |
| 473 | { |
| 474 | .procname = "tcp_congestion_control", |
| 475 | .mode = 0644, |
| 476 | .maxlen = TCP_CA_NAME_MAX, |
| 477 | .proc_handler = proc_tcp_congestion_control, |
| 478 | }, |
| 479 | { |
| 480 | .procname = "tcp_abc", |
| 481 | .data = &sysctl_tcp_abc, |
| 482 | .maxlen = sizeof(int), |
| 483 | .mode = 0644, |
| 484 | .proc_handler = proc_dointvec, |
| 485 | }, |
| 486 | { |
| 487 | .procname = "tcp_mtu_probing", |
| 488 | .data = &sysctl_tcp_mtu_probing, |
| 489 | .maxlen = sizeof(int), |
| 490 | .mode = 0644, |
| 491 | .proc_handler = proc_dointvec, |
| 492 | }, |
| 493 | { |
| 494 | .procname = "tcp_base_mss", |
| 495 | .data = &sysctl_tcp_base_mss, |
| 496 | .maxlen = sizeof(int), |
| 497 | .mode = 0644, |
| 498 | .proc_handler = proc_dointvec, |
| 499 | }, |
| 500 | { |
| 501 | .procname = "tcp_workaround_signed_windows", |
| 502 | .data = &sysctl_tcp_workaround_signed_windows, |
| 503 | .maxlen = sizeof(int), |
| 504 | .mode = 0644, |
| 505 | .proc_handler = proc_dointvec |
| 506 | }, |
| 507 | #ifdef CONFIG_NET_DMA |
| 508 | { |
| 509 | .procname = "tcp_dma_copybreak", |
| 510 | .data = &sysctl_tcp_dma_copybreak, |
| 511 | .maxlen = sizeof(int), |
| 512 | .mode = 0644, |
| 513 | .proc_handler = proc_dointvec |
| 514 | }, |
| 515 | #endif |
| 516 | { |
| 517 | .procname = "tcp_slow_start_after_idle", |
| 518 | .data = &sysctl_tcp_slow_start_after_idle, |
| 519 | .maxlen = sizeof(int), |
| 520 | .mode = 0644, |
| 521 | .proc_handler = proc_dointvec |
| 522 | }, |
| 523 | #ifdef CONFIG_NETLABEL |
| 524 | { |
| 525 | .procname = "cipso_cache_enable", |
| 526 | .data = &cipso_v4_cache_enabled, |
| 527 | .maxlen = sizeof(int), |
| 528 | .mode = 0644, |
| 529 | .proc_handler = proc_dointvec, |
| 530 | }, |
| 531 | { |
| 532 | .procname = "cipso_cache_bucket_size", |
| 533 | .data = &cipso_v4_cache_bucketsize, |
| 534 | .maxlen = sizeof(int), |
| 535 | .mode = 0644, |
| 536 | .proc_handler = proc_dointvec, |
| 537 | }, |
| 538 | { |
| 539 | .procname = "cipso_rbm_optfmt", |
| 540 | .data = &cipso_v4_rbm_optfmt, |
| 541 | .maxlen = sizeof(int), |
| 542 | .mode = 0644, |
| 543 | .proc_handler = proc_dointvec, |
| 544 | }, |
| 545 | { |
| 546 | .procname = "cipso_rbm_strictvalid", |
| 547 | .data = &cipso_v4_rbm_strictvalid, |
| 548 | .maxlen = sizeof(int), |
| 549 | .mode = 0644, |
| 550 | .proc_handler = proc_dointvec, |
| 551 | }, |
| 552 | #endif /* CONFIG_NETLABEL */ |
| 553 | { |
| 554 | .procname = "tcp_available_congestion_control", |
| 555 | .maxlen = TCP_CA_BUF_MAX, |
| 556 | .mode = 0444, |
| 557 | .proc_handler = proc_tcp_available_congestion_control, |
| 558 | }, |
| 559 | { |
| 560 | .procname = "tcp_allowed_congestion_control", |
| 561 | .maxlen = TCP_CA_BUF_MAX, |
| 562 | .mode = 0644, |
| 563 | .proc_handler = proc_allowed_congestion_control, |
| 564 | }, |
| 565 | { |
| 566 | .procname = "tcp_max_ssthresh", |
| 567 | .data = &sysctl_tcp_max_ssthresh, |
| 568 | .maxlen = sizeof(int), |
| 569 | .mode = 0644, |
| 570 | .proc_handler = proc_dointvec, |
| 571 | }, |
| 572 | { |
| 573 | .procname = "tcp_cookie_size", |
| 574 | .data = &sysctl_tcp_cookie_size, |
| 575 | .maxlen = sizeof(int), |
| 576 | .mode = 0644, |
| 577 | .proc_handler = proc_dointvec |
| 578 | }, |
| 579 | { |
| 580 | .procname = "tcp_thin_linear_timeouts", |
| 581 | .data = &sysctl_tcp_thin_linear_timeouts, |
| 582 | .maxlen = sizeof(int), |
| 583 | .mode = 0644, |
| 584 | .proc_handler = proc_dointvec |
| 585 | }, |
| 586 | { |
| 587 | .procname = "tcp_thin_dupack", |
| 588 | .data = &sysctl_tcp_thin_dupack, |
| 589 | .maxlen = sizeof(int), |
| 590 | .mode = 0644, |
| 591 | .proc_handler = proc_dointvec |
| 592 | }, |
| 593 | { |
| 594 | .procname = "udp_mem", |
| 595 | .data = &sysctl_udp_mem, |
| 596 | .maxlen = sizeof(sysctl_udp_mem), |
| 597 | .mode = 0644, |
| 598 | .proc_handler = proc_dointvec_minmax, |
| 599 | .extra1 = &zero |
| 600 | }, |
| 601 | { |
| 602 | .procname = "udp_rmem_min", |
| 603 | .data = &sysctl_udp_rmem_min, |
| 604 | .maxlen = sizeof(sysctl_udp_rmem_min), |
| 605 | .mode = 0644, |
| 606 | .proc_handler = proc_dointvec_minmax, |
| 607 | .extra1 = &zero |
| 608 | }, |
| 609 | { |
| 610 | .procname = "udp_wmem_min", |
| 611 | .data = &sysctl_udp_wmem_min, |
| 612 | .maxlen = sizeof(sysctl_udp_wmem_min), |
| 613 | .mode = 0644, |
| 614 | .proc_handler = proc_dointvec_minmax, |
| 615 | .extra1 = &zero |
| 616 | }, |
| 617 | { } |
| 618 | }; |
| 619 | |
| 620 | static struct ctl_table ipv4_net_table[] = { |
| 621 | { |
| 622 | .procname = "icmp_echo_ignore_all", |
| 623 | .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, |
| 624 | .maxlen = sizeof(int), |
| 625 | .mode = 0644, |
| 626 | .proc_handler = proc_dointvec |
| 627 | }, |
| 628 | { |
| 629 | .procname = "icmp_echo_ignore_broadcasts", |
| 630 | .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, |
| 631 | .maxlen = sizeof(int), |
| 632 | .mode = 0644, |
| 633 | .proc_handler = proc_dointvec |
| 634 | }, |
| 635 | { |
| 636 | .procname = "icmp_ignore_bogus_error_responses", |
| 637 | .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, |
| 638 | .maxlen = sizeof(int), |
| 639 | .mode = 0644, |
| 640 | .proc_handler = proc_dointvec |
| 641 | }, |
| 642 | { |
| 643 | .procname = "icmp_errors_use_inbound_ifaddr", |
| 644 | .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, |
| 645 | .maxlen = sizeof(int), |
| 646 | .mode = 0644, |
| 647 | .proc_handler = proc_dointvec |
| 648 | }, |
| 649 | { |
| 650 | .procname = "icmp_ratelimit", |
| 651 | .data = &init_net.ipv4.sysctl_icmp_ratelimit, |
| 652 | .maxlen = sizeof(int), |
| 653 | .mode = 0644, |
| 654 | .proc_handler = proc_dointvec_ms_jiffies, |
| 655 | }, |
| 656 | { |
| 657 | .procname = "icmp_ratemask", |
| 658 | .data = &init_net.ipv4.sysctl_icmp_ratemask, |
| 659 | .maxlen = sizeof(int), |
| 660 | .mode = 0644, |
| 661 | .proc_handler = proc_dointvec |
| 662 | }, |
| 663 | { |
| 664 | .procname = "rt_cache_rebuild_count", |
| 665 | .data = &init_net.ipv4.sysctl_rt_cache_rebuild_count, |
| 666 | .maxlen = sizeof(int), |
| 667 | .mode = 0644, |
| 668 | .proc_handler = proc_dointvec |
| 669 | }, |
| 670 | { } |
| 671 | }; |
| 672 | |
| 673 | struct ctl_path net_ipv4_ctl_path[] = { |
| 674 | { .procname = "net", }, |
| 675 | { .procname = "ipv4", }, |
| 676 | { }, |
| 677 | }; |
| 678 | EXPORT_SYMBOL_GPL(net_ipv4_ctl_path); |
| 679 | |
| 680 | static __net_init int ipv4_sysctl_init_net(struct net *net) |
| 681 | { |
| 682 | struct ctl_table *table; |
| 683 | |
| 684 | table = ipv4_net_table; |
| 685 | if (!net_eq(net, &init_net)) { |
| 686 | table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); |
| 687 | if (table == NULL) |
| 688 | goto err_alloc; |
| 689 | |
| 690 | table[0].data = |
| 691 | &net->ipv4.sysctl_icmp_echo_ignore_all; |
| 692 | table[1].data = |
| 693 | &net->ipv4.sysctl_icmp_echo_ignore_broadcasts; |
| 694 | table[2].data = |
| 695 | &net->ipv4.sysctl_icmp_ignore_bogus_error_responses; |
| 696 | table[3].data = |
| 697 | &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr; |
| 698 | table[4].data = |
| 699 | &net->ipv4.sysctl_icmp_ratelimit; |
| 700 | table[5].data = |
| 701 | &net->ipv4.sysctl_icmp_ratemask; |
| 702 | table[6].data = |
| 703 | &net->ipv4.sysctl_rt_cache_rebuild_count; |
| 704 | } |
| 705 | |
| 706 | net->ipv4.sysctl_rt_cache_rebuild_count = 4; |
| 707 | |
| 708 | net->ipv4.ipv4_hdr = register_net_sysctl_table(net, |
| 709 | net_ipv4_ctl_path, table); |
| 710 | if (net->ipv4.ipv4_hdr == NULL) |
| 711 | goto err_reg; |
| 712 | |
| 713 | return 0; |
| 714 | |
| 715 | err_reg: |
| 716 | if (!net_eq(net, &init_net)) |
| 717 | kfree(table); |
| 718 | err_alloc: |
| 719 | return -ENOMEM; |
| 720 | } |
| 721 | |
| 722 | static __net_exit void ipv4_sysctl_exit_net(struct net *net) |
| 723 | { |
| 724 | struct ctl_table *table; |
| 725 | |
| 726 | table = net->ipv4.ipv4_hdr->ctl_table_arg; |
| 727 | unregister_net_sysctl_table(net->ipv4.ipv4_hdr); |
| 728 | kfree(table); |
| 729 | } |
| 730 | |
| 731 | static __net_initdata struct pernet_operations ipv4_sysctl_ops = { |
| 732 | .init = ipv4_sysctl_init_net, |
| 733 | .exit = ipv4_sysctl_exit_net, |
| 734 | }; |
| 735 | |
| 736 | static __init int sysctl_ipv4_init(void) |
| 737 | { |
| 738 | struct ctl_table_header *hdr; |
| 739 | |
| 740 | hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table); |
| 741 | if (hdr == NULL) |
| 742 | return -ENOMEM; |
| 743 | |
| 744 | if (register_pernet_subsys(&ipv4_sysctl_ops)) { |
| 745 | unregister_sysctl_table(hdr); |
| 746 | return -ENOMEM; |
| 747 | } |
| 748 | |
| 749 | return 0; |
| 750 | } |
| 751 | |
| 752 | __initcall(sysctl_ipv4_init); |