1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem. 4 * 5 * Begun April 1, 1996, Mike Shaver. 6 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS] 7 */ 8 9 #include <linux/sysctl.h> 10 #include <linux/seqlock.h> 11 #include <linux/init.h> 12 #include <linux/slab.h> 13 #include <net/icmp.h> 14 #include <net/ip.h> 15 #include <net/ip_fib.h> 16 #include <net/tcp.h> 17 #include <net/udp.h> 18 #include <net/cipso_ipv4.h> 19 #include <net/ping.h> 20 #include <net/protocol.h> 21 #include <net/netevent.h> 22 23 static int two = 2; 24 static int three __maybe_unused = 3; 25 static int four = 4; 26 static int thousand = 1000; 27 static int tcp_retr1_max = 255; 28 static int ip_local_port_range_min[] = { 1, 1 }; 29 static int ip_local_port_range_max[] = { 65535, 65535 }; 30 static int tcp_adv_win_scale_min = -31; 31 static int tcp_adv_win_scale_max = 31; 32 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS; 33 static int tcp_min_snd_mss_max = 65535; 34 static int ip_privileged_port_min; 35 static int ip_privileged_port_max = 65535; 36 static int ip_ttl_min = 1; 37 static int ip_ttl_max = 255; 38 static int tcp_syn_retries_min = 1; 39 static int tcp_syn_retries_max = MAX_TCP_SYNCNT; 40 static int ip_ping_group_range_min[] = { 0, 0 }; 41 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX }; 42 static u32 u32_max_div_HZ = UINT_MAX / HZ; 43 static int one_day_secs = 24 * 3600; 44 static u32 fib_multipath_hash_fields_all_mask __maybe_unused = 45 FIB_MULTIPATH_HASH_FIELD_ALL_MASK; 46 47 /* obsolete */ 48 static int sysctl_tcp_low_latency __read_mostly; 49 50 /* Update system visible IP port range */ 51 static void set_local_port_range(struct net *net, int range[2]) 52 { 53 bool same_parity = !((range[0] ^ range[1]) & 1); 54 55 write_seqlock_bh(&net->ipv4.ip_local_ports.lock); 56 if (same_parity && !net->ipv4.ip_local_ports.warned) { 57 net->ipv4.ip_local_ports.warned = true; 58 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n"); 59 } 60 net->ipv4.ip_local_ports.range[0] = range[0]; 61 net->ipv4.ip_local_ports.range[1] = range[1]; 62 write_sequnlock_bh(&net->ipv4.ip_local_ports.lock); 63 } 64 65 /* Validate changes from /proc interface. */ 66 static int ipv4_local_port_range(struct ctl_table *table, int write, 67 void *buffer, size_t *lenp, loff_t *ppos) 68 { 69 struct net *net = 70 container_of(table->data, struct net, ipv4.ip_local_ports.range); 71 int ret; 72 int range[2]; 73 struct ctl_table tmp = { 74 .data = &range, 75 .maxlen = sizeof(range), 76 .mode = table->mode, 77 .extra1 = &ip_local_port_range_min, 78 .extra2 = &ip_local_port_range_max, 79 }; 80 81 inet_get_local_port_range(net, &range[0], &range[1]); 82 83 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 84 85 if (write && ret == 0) { 86 /* Ensure that the upper limit is not smaller than the lower, 87 * and that the lower does not encroach upon the privileged 88 * port limit. 89 */ 90 if ((range[1] < range[0]) || 91 (range[0] < net->ipv4.sysctl_ip_prot_sock)) 92 ret = -EINVAL; 93 else 94 set_local_port_range(net, range); 95 } 96 97 return ret; 98 } 99 100 /* Validate changes from /proc interface. */ 101 static int ipv4_privileged_ports(struct ctl_table *table, int write, 102 void *buffer, size_t *lenp, loff_t *ppos) 103 { 104 struct net *net = container_of(table->data, struct net, 105 ipv4.sysctl_ip_prot_sock); 106 int ret; 107 int pports; 108 int range[2]; 109 struct ctl_table tmp = { 110 .data = &pports, 111 .maxlen = sizeof(pports), 112 .mode = table->mode, 113 .extra1 = &ip_privileged_port_min, 114 .extra2 = &ip_privileged_port_max, 115 }; 116 117 pports = net->ipv4.sysctl_ip_prot_sock; 118 119 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 120 121 if (write && ret == 0) { 122 inet_get_local_port_range(net, &range[0], &range[1]); 123 /* Ensure that the local port range doesn't overlap with the 124 * privileged port range. 125 */ 126 if (range[0] < pports) 127 ret = -EINVAL; 128 else 129 net->ipv4.sysctl_ip_prot_sock = pports; 130 } 131 132 return ret; 133 } 134 135 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high) 136 { 137 kgid_t *data = table->data; 138 struct net *net = 139 container_of(table->data, struct net, ipv4.ping_group_range.range); 140 unsigned int seq; 141 do { 142 seq = read_seqbegin(&net->ipv4.ping_group_range.lock); 143 144 *low = data[0]; 145 *high = data[1]; 146 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); 147 } 148 149 /* Update system visible IP port range */ 150 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high) 151 { 152 kgid_t *data = table->data; 153 struct net *net = 154 container_of(table->data, struct net, ipv4.ping_group_range.range); 155 write_seqlock(&net->ipv4.ping_group_range.lock); 156 data[0] = low; 157 data[1] = high; 158 write_sequnlock(&net->ipv4.ping_group_range.lock); 159 } 160 161 /* Validate changes from /proc interface. */ 162 static int ipv4_ping_group_range(struct ctl_table *table, int write, 163 void *buffer, size_t *lenp, loff_t *ppos) 164 { 165 struct user_namespace *user_ns = current_user_ns(); 166 int ret; 167 gid_t urange[2]; 168 kgid_t low, high; 169 struct ctl_table tmp = { 170 .data = &urange, 171 .maxlen = sizeof(urange), 172 .mode = table->mode, 173 .extra1 = &ip_ping_group_range_min, 174 .extra2 = &ip_ping_group_range_max, 175 }; 176 177 inet_get_ping_group_range_table(table, &low, &high); 178 urange[0] = from_kgid_munged(user_ns, low); 179 urange[1] = from_kgid_munged(user_ns, high); 180 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 181 182 if (write && ret == 0) { 183 low = make_kgid(user_ns, urange[0]); 184 high = make_kgid(user_ns, urange[1]); 185 if (!gid_valid(low) || !gid_valid(high)) 186 return -EINVAL; 187 if (urange[1] < urange[0] || gid_lt(high, low)) { 188 low = make_kgid(&init_user_ns, 1); 189 high = make_kgid(&init_user_ns, 0); 190 } 191 set_ping_group_range(table, low, high); 192 } 193 194 return ret; 195 } 196 197 static int ipv4_fwd_update_priority(struct ctl_table *table, int write, 198 void *buffer, size_t *lenp, loff_t *ppos) 199 { 200 struct net *net; 201 int ret; 202 203 net = container_of(table->data, struct net, 204 ipv4.sysctl_ip_fwd_update_priority); 205 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 206 if (write && ret == 0) 207 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE, 208 net); 209 210 return ret; 211 } 212 213 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write, 214 void *buffer, size_t *lenp, loff_t *ppos) 215 { 216 struct net *net = container_of(ctl->data, struct net, 217 ipv4.tcp_congestion_control); 218 char val[TCP_CA_NAME_MAX]; 219 struct ctl_table tbl = { 220 .data = val, 221 .maxlen = TCP_CA_NAME_MAX, 222 }; 223 int ret; 224 225 tcp_get_default_congestion_control(net, val); 226 227 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 228 if (write && ret == 0) 229 ret = tcp_set_default_congestion_control(net, val); 230 return ret; 231 } 232 233 static int proc_tcp_available_congestion_control(struct ctl_table *ctl, 234 int write, void *buffer, 235 size_t *lenp, loff_t *ppos) 236 { 237 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, }; 238 int ret; 239 240 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 241 if (!tbl.data) 242 return -ENOMEM; 243 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX); 244 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 245 kfree(tbl.data); 246 return ret; 247 } 248 249 static int proc_allowed_congestion_control(struct ctl_table *ctl, 250 int write, void *buffer, 251 size_t *lenp, loff_t *ppos) 252 { 253 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX }; 254 int ret; 255 256 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 257 if (!tbl.data) 258 return -ENOMEM; 259 260 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen); 261 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 262 if (write && ret == 0) 263 ret = tcp_set_allowed_congestion_control(tbl.data); 264 kfree(tbl.data); 265 return ret; 266 } 267 268 static int sscanf_key(char *buf, __le32 *key) 269 { 270 u32 user_key[4]; 271 int i, ret = 0; 272 273 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1, 274 user_key + 2, user_key + 3) != 4) { 275 ret = -EINVAL; 276 } else { 277 for (i = 0; i < ARRAY_SIZE(user_key); i++) 278 key[i] = cpu_to_le32(user_key[i]); 279 } 280 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n", 281 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret); 282 283 return ret; 284 } 285 286 static int proc_tcp_fastopen_key(struct ctl_table *table, int write, 287 void *buffer, size_t *lenp, loff_t *ppos) 288 { 289 struct net *net = container_of(table->data, struct net, 290 ipv4.sysctl_tcp_fastopen); 291 /* maxlen to print the list of keys in hex (*2), with dashes 292 * separating doublewords and a comma in between keys. 293 */ 294 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 295 2 * TCP_FASTOPEN_KEY_MAX) + 296 (TCP_FASTOPEN_KEY_MAX * 5)) }; 297 u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)]; 298 __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)]; 299 char *backup_data; 300 int ret, i = 0, off = 0, n_keys; 301 302 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL); 303 if (!tbl.data) 304 return -ENOMEM; 305 306 n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key); 307 if (!n_keys) { 308 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH); 309 n_keys = 1; 310 } 311 312 for (i = 0; i < n_keys * 4; i++) 313 user_key[i] = le32_to_cpu(key[i]); 314 315 for (i = 0; i < n_keys; i++) { 316 off += snprintf(tbl.data + off, tbl.maxlen - off, 317 "%08x-%08x-%08x-%08x", 318 user_key[i * 4], 319 user_key[i * 4 + 1], 320 user_key[i * 4 + 2], 321 user_key[i * 4 + 3]); 322 323 if (WARN_ON_ONCE(off >= tbl.maxlen - 1)) 324 break; 325 326 if (i + 1 < n_keys) 327 off += snprintf(tbl.data + off, tbl.maxlen - off, ","); 328 } 329 330 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 331 332 if (write && ret == 0) { 333 backup_data = strchr(tbl.data, ','); 334 if (backup_data) { 335 *backup_data = '\0'; 336 backup_data++; 337 } 338 if (sscanf_key(tbl.data, key)) { 339 ret = -EINVAL; 340 goto bad_key; 341 } 342 if (backup_data) { 343 if (sscanf_key(backup_data, key + 4)) { 344 ret = -EINVAL; 345 goto bad_key; 346 } 347 } 348 tcp_fastopen_reset_cipher(net, NULL, key, 349 backup_data ? key + 4 : NULL); 350 } 351 352 bad_key: 353 kfree(tbl.data); 354 return ret; 355 } 356 357 static void proc_configure_early_demux(int enabled, int protocol) 358 { 359 struct net_protocol *ipprot; 360 #if IS_ENABLED(CONFIG_IPV6) 361 struct inet6_protocol *ip6prot; 362 #endif 363 364 rcu_read_lock(); 365 366 ipprot = rcu_dereference(inet_protos[protocol]); 367 if (ipprot) 368 ipprot->early_demux = enabled ? ipprot->early_demux_handler : 369 NULL; 370 371 #if IS_ENABLED(CONFIG_IPV6) 372 ip6prot = rcu_dereference(inet6_protos[protocol]); 373 if (ip6prot) 374 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler : 375 NULL; 376 #endif 377 rcu_read_unlock(); 378 } 379 380 static int proc_tcp_early_demux(struct ctl_table *table, int write, 381 void *buffer, size_t *lenp, loff_t *ppos) 382 { 383 int ret = 0; 384 385 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 386 387 if (write && !ret) { 388 int enabled = init_net.ipv4.sysctl_tcp_early_demux; 389 390 proc_configure_early_demux(enabled, IPPROTO_TCP); 391 } 392 393 return ret; 394 } 395 396 static int proc_udp_early_demux(struct ctl_table *table, int write, 397 void *buffer, size_t *lenp, loff_t *ppos) 398 { 399 int ret = 0; 400 401 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 402 403 if (write && !ret) { 404 int enabled = init_net.ipv4.sysctl_udp_early_demux; 405 406 proc_configure_early_demux(enabled, IPPROTO_UDP); 407 } 408 409 return ret; 410 } 411 412 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table, 413 int write, void *buffer, 414 size_t *lenp, loff_t *ppos) 415 { 416 struct net *net = container_of(table->data, struct net, 417 ipv4.sysctl_tcp_fastopen_blackhole_timeout); 418 int ret; 419 420 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 421 if (write && ret == 0) 422 atomic_set(&net->ipv4.tfo_active_disable_times, 0); 423 424 return ret; 425 } 426 427 static int proc_tcp_available_ulp(struct ctl_table *ctl, 428 int write, void *buffer, size_t *lenp, 429 loff_t *ppos) 430 { 431 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, }; 432 int ret; 433 434 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 435 if (!tbl.data) 436 return -ENOMEM; 437 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX); 438 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 439 kfree(tbl.data); 440 441 return ret; 442 } 443 444 #ifdef CONFIG_IP_ROUTE_MULTIPATH 445 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write, 446 void *buffer, size_t *lenp, 447 loff_t *ppos) 448 { 449 struct net *net = container_of(table->data, struct net, 450 ipv4.sysctl_fib_multipath_hash_policy); 451 int ret; 452 453 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 454 if (write && ret == 0) 455 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 456 457 return ret; 458 } 459 460 static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write, 461 void *buffer, size_t *lenp, 462 loff_t *ppos) 463 { 464 struct net *net; 465 int ret; 466 467 net = container_of(table->data, struct net, 468 ipv4.sysctl_fib_multipath_hash_fields); 469 ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos); 470 if (write && ret == 0) 471 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 472 473 return ret; 474 } 475 #endif 476 477 static struct ctl_table ipv4_table[] = { 478 { 479 .procname = "tcp_max_orphans", 480 .data = &sysctl_tcp_max_orphans, 481 .maxlen = sizeof(int), 482 .mode = 0644, 483 .proc_handler = proc_dointvec 484 }, 485 { 486 .procname = "inet_peer_threshold", 487 .data = &inet_peer_threshold, 488 .maxlen = sizeof(int), 489 .mode = 0644, 490 .proc_handler = proc_dointvec 491 }, 492 { 493 .procname = "inet_peer_minttl", 494 .data = &inet_peer_minttl, 495 .maxlen = sizeof(int), 496 .mode = 0644, 497 .proc_handler = proc_dointvec_jiffies, 498 }, 499 { 500 .procname = "inet_peer_maxttl", 501 .data = &inet_peer_maxttl, 502 .maxlen = sizeof(int), 503 .mode = 0644, 504 .proc_handler = proc_dointvec_jiffies, 505 }, 506 { 507 .procname = "tcp_mem", 508 .maxlen = sizeof(sysctl_tcp_mem), 509 .data = &sysctl_tcp_mem, 510 .mode = 0644, 511 .proc_handler = proc_doulongvec_minmax, 512 }, 513 { 514 .procname = "tcp_low_latency", 515 .data = &sysctl_tcp_low_latency, 516 .maxlen = sizeof(int), 517 .mode = 0644, 518 .proc_handler = proc_dointvec 519 }, 520 #ifdef CONFIG_NETLABEL 521 { 522 .procname = "cipso_cache_enable", 523 .data = &cipso_v4_cache_enabled, 524 .maxlen = sizeof(int), 525 .mode = 0644, 526 .proc_handler = proc_dointvec, 527 }, 528 { 529 .procname = "cipso_cache_bucket_size", 530 .data = &cipso_v4_cache_bucketsize, 531 .maxlen = sizeof(int), 532 .mode = 0644, 533 .proc_handler = proc_dointvec, 534 }, 535 { 536 .procname = "cipso_rbm_optfmt", 537 .data = &cipso_v4_rbm_optfmt, 538 .maxlen = sizeof(int), 539 .mode = 0644, 540 .proc_handler = proc_dointvec, 541 }, 542 { 543 .procname = "cipso_rbm_strictvalid", 544 .data = &cipso_v4_rbm_strictvalid, 545 .maxlen = sizeof(int), 546 .mode = 0644, 547 .proc_handler = proc_dointvec, 548 }, 549 #endif /* CONFIG_NETLABEL */ 550 { 551 .procname = "tcp_available_ulp", 552 .maxlen = TCP_ULP_BUF_MAX, 553 .mode = 0444, 554 .proc_handler = proc_tcp_available_ulp, 555 }, 556 { 557 .procname = "icmp_msgs_per_sec", 558 .data = &sysctl_icmp_msgs_per_sec, 559 .maxlen = sizeof(int), 560 .mode = 0644, 561 .proc_handler = proc_dointvec_minmax, 562 .extra1 = SYSCTL_ZERO, 563 }, 564 { 565 .procname = "icmp_msgs_burst", 566 .data = &sysctl_icmp_msgs_burst, 567 .maxlen = sizeof(int), 568 .mode = 0644, 569 .proc_handler = proc_dointvec_minmax, 570 .extra1 = SYSCTL_ZERO, 571 }, 572 { 573 .procname = "udp_mem", 574 .data = &sysctl_udp_mem, 575 .maxlen = sizeof(sysctl_udp_mem), 576 .mode = 0644, 577 .proc_handler = proc_doulongvec_minmax, 578 }, 579 { 580 .procname = "fib_sync_mem", 581 .data = &sysctl_fib_sync_mem, 582 .maxlen = sizeof(sysctl_fib_sync_mem), 583 .mode = 0644, 584 .proc_handler = proc_douintvec_minmax, 585 .extra1 = &sysctl_fib_sync_mem_min, 586 .extra2 = &sysctl_fib_sync_mem_max, 587 }, 588 { } 589 }; 590 591 static struct ctl_table ipv4_net_table[] = { 592 { 593 .procname = "icmp_echo_ignore_all", 594 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, 595 .maxlen = sizeof(u8), 596 .mode = 0644, 597 .proc_handler = proc_dou8vec_minmax, 598 }, 599 { 600 .procname = "icmp_echo_enable_probe", 601 .data = &init_net.ipv4.sysctl_icmp_echo_enable_probe, 602 .maxlen = sizeof(u8), 603 .mode = 0644, 604 .proc_handler = proc_dou8vec_minmax, 605 .extra1 = SYSCTL_ZERO, 606 .extra2 = SYSCTL_ONE 607 }, 608 { 609 .procname = "icmp_echo_ignore_broadcasts", 610 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, 611 .maxlen = sizeof(u8), 612 .mode = 0644, 613 .proc_handler = proc_dou8vec_minmax, 614 }, 615 { 616 .procname = "icmp_ignore_bogus_error_responses", 617 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, 618 .maxlen = sizeof(u8), 619 .mode = 0644, 620 .proc_handler = proc_dou8vec_minmax, 621 }, 622 { 623 .procname = "icmp_errors_use_inbound_ifaddr", 624 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, 625 .maxlen = sizeof(u8), 626 .mode = 0644, 627 .proc_handler = proc_dou8vec_minmax, 628 }, 629 { 630 .procname = "icmp_ratelimit", 631 .data = &init_net.ipv4.sysctl_icmp_ratelimit, 632 .maxlen = sizeof(int), 633 .mode = 0644, 634 .proc_handler = proc_dointvec_ms_jiffies, 635 }, 636 { 637 .procname = "icmp_ratemask", 638 .data = &init_net.ipv4.sysctl_icmp_ratemask, 639 .maxlen = sizeof(int), 640 .mode = 0644, 641 .proc_handler = proc_dointvec 642 }, 643 { 644 .procname = "ping_group_range", 645 .data = &init_net.ipv4.ping_group_range.range, 646 .maxlen = sizeof(gid_t)*2, 647 .mode = 0644, 648 .proc_handler = ipv4_ping_group_range, 649 }, 650 #ifdef CONFIG_NET_L3_MASTER_DEV 651 { 652 .procname = "raw_l3mdev_accept", 653 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept, 654 .maxlen = sizeof(u8), 655 .mode = 0644, 656 .proc_handler = proc_dou8vec_minmax, 657 .extra1 = SYSCTL_ZERO, 658 .extra2 = SYSCTL_ONE, 659 }, 660 #endif 661 { 662 .procname = "tcp_ecn", 663 .data = &init_net.ipv4.sysctl_tcp_ecn, 664 .maxlen = sizeof(u8), 665 .mode = 0644, 666 .proc_handler = proc_dou8vec_minmax, 667 }, 668 { 669 .procname = "tcp_ecn_fallback", 670 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback, 671 .maxlen = sizeof(u8), 672 .mode = 0644, 673 .proc_handler = proc_dou8vec_minmax, 674 }, 675 { 676 .procname = "ip_dynaddr", 677 .data = &init_net.ipv4.sysctl_ip_dynaddr, 678 .maxlen = sizeof(u8), 679 .mode = 0644, 680 .proc_handler = proc_dou8vec_minmax, 681 }, 682 { 683 .procname = "ip_early_demux", 684 .data = &init_net.ipv4.sysctl_ip_early_demux, 685 .maxlen = sizeof(u8), 686 .mode = 0644, 687 .proc_handler = proc_dou8vec_minmax, 688 }, 689 { 690 .procname = "udp_early_demux", 691 .data = &init_net.ipv4.sysctl_udp_early_demux, 692 .maxlen = sizeof(u8), 693 .mode = 0644, 694 .proc_handler = proc_udp_early_demux 695 }, 696 { 697 .procname = "tcp_early_demux", 698 .data = &init_net.ipv4.sysctl_tcp_early_demux, 699 .maxlen = sizeof(u8), 700 .mode = 0644, 701 .proc_handler = proc_tcp_early_demux 702 }, 703 { 704 .procname = "nexthop_compat_mode", 705 .data = &init_net.ipv4.sysctl_nexthop_compat_mode, 706 .maxlen = sizeof(u8), 707 .mode = 0644, 708 .proc_handler = proc_dou8vec_minmax, 709 .extra1 = SYSCTL_ZERO, 710 .extra2 = SYSCTL_ONE, 711 }, 712 { 713 .procname = "ip_default_ttl", 714 .data = &init_net.ipv4.sysctl_ip_default_ttl, 715 .maxlen = sizeof(u8), 716 .mode = 0644, 717 .proc_handler = proc_dou8vec_minmax, 718 .extra1 = &ip_ttl_min, 719 .extra2 = &ip_ttl_max, 720 }, 721 { 722 .procname = "ip_local_port_range", 723 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range), 724 .data = &init_net.ipv4.ip_local_ports.range, 725 .mode = 0644, 726 .proc_handler = ipv4_local_port_range, 727 }, 728 { 729 .procname = "ip_local_reserved_ports", 730 .data = &init_net.ipv4.sysctl_local_reserved_ports, 731 .maxlen = 65536, 732 .mode = 0644, 733 .proc_handler = proc_do_large_bitmap, 734 }, 735 { 736 .procname = "ip_no_pmtu_disc", 737 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc, 738 .maxlen = sizeof(u8), 739 .mode = 0644, 740 .proc_handler = proc_dou8vec_minmax, 741 }, 742 { 743 .procname = "ip_forward_use_pmtu", 744 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu, 745 .maxlen = sizeof(u8), 746 .mode = 0644, 747 .proc_handler = proc_dou8vec_minmax, 748 }, 749 { 750 .procname = "ip_forward_update_priority", 751 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority, 752 .maxlen = sizeof(u8), 753 .mode = 0644, 754 .proc_handler = ipv4_fwd_update_priority, 755 .extra1 = SYSCTL_ZERO, 756 .extra2 = SYSCTL_ONE, 757 }, 758 { 759 .procname = "ip_nonlocal_bind", 760 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind, 761 .maxlen = sizeof(u8), 762 .mode = 0644, 763 .proc_handler = proc_dou8vec_minmax, 764 }, 765 { 766 .procname = "ip_autobind_reuse", 767 .data = &init_net.ipv4.sysctl_ip_autobind_reuse, 768 .maxlen = sizeof(u8), 769 .mode = 0644, 770 .proc_handler = proc_dou8vec_minmax, 771 .extra1 = SYSCTL_ZERO, 772 .extra2 = SYSCTL_ONE, 773 }, 774 { 775 .procname = "fwmark_reflect", 776 .data = &init_net.ipv4.sysctl_fwmark_reflect, 777 .maxlen = sizeof(u8), 778 .mode = 0644, 779 .proc_handler = proc_dou8vec_minmax, 780 }, 781 { 782 .procname = "tcp_fwmark_accept", 783 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept, 784 .maxlen = sizeof(u8), 785 .mode = 0644, 786 .proc_handler = proc_dou8vec_minmax, 787 }, 788 #ifdef CONFIG_NET_L3_MASTER_DEV 789 { 790 .procname = "tcp_l3mdev_accept", 791 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept, 792 .maxlen = sizeof(u8), 793 .mode = 0644, 794 .proc_handler = proc_dou8vec_minmax, 795 .extra1 = SYSCTL_ZERO, 796 .extra2 = SYSCTL_ONE, 797 }, 798 #endif 799 { 800 .procname = "tcp_mtu_probing", 801 .data = &init_net.ipv4.sysctl_tcp_mtu_probing, 802 .maxlen = sizeof(u8), 803 .mode = 0644, 804 .proc_handler = proc_dou8vec_minmax, 805 }, 806 { 807 .procname = "tcp_base_mss", 808 .data = &init_net.ipv4.sysctl_tcp_base_mss, 809 .maxlen = sizeof(int), 810 .mode = 0644, 811 .proc_handler = proc_dointvec, 812 }, 813 { 814 .procname = "tcp_min_snd_mss", 815 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss, 816 .maxlen = sizeof(int), 817 .mode = 0644, 818 .proc_handler = proc_dointvec_minmax, 819 .extra1 = &tcp_min_snd_mss_min, 820 .extra2 = &tcp_min_snd_mss_max, 821 }, 822 { 823 .procname = "tcp_mtu_probe_floor", 824 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor, 825 .maxlen = sizeof(int), 826 .mode = 0644, 827 .proc_handler = proc_dointvec_minmax, 828 .extra1 = &tcp_min_snd_mss_min, 829 .extra2 = &tcp_min_snd_mss_max, 830 }, 831 { 832 .procname = "tcp_probe_threshold", 833 .data = &init_net.ipv4.sysctl_tcp_probe_threshold, 834 .maxlen = sizeof(int), 835 .mode = 0644, 836 .proc_handler = proc_dointvec, 837 }, 838 { 839 .procname = "tcp_probe_interval", 840 .data = &init_net.ipv4.sysctl_tcp_probe_interval, 841 .maxlen = sizeof(u32), 842 .mode = 0644, 843 .proc_handler = proc_douintvec_minmax, 844 .extra2 = &u32_max_div_HZ, 845 }, 846 { 847 .procname = "igmp_link_local_mcast_reports", 848 .data = &init_net.ipv4.sysctl_igmp_llm_reports, 849 .maxlen = sizeof(u8), 850 .mode = 0644, 851 .proc_handler = proc_dou8vec_minmax, 852 }, 853 { 854 .procname = "igmp_max_memberships", 855 .data = &init_net.ipv4.sysctl_igmp_max_memberships, 856 .maxlen = sizeof(int), 857 .mode = 0644, 858 .proc_handler = proc_dointvec 859 }, 860 { 861 .procname = "igmp_max_msf", 862 .data = &init_net.ipv4.sysctl_igmp_max_msf, 863 .maxlen = sizeof(int), 864 .mode = 0644, 865 .proc_handler = proc_dointvec 866 }, 867 #ifdef CONFIG_IP_MULTICAST 868 { 869 .procname = "igmp_qrv", 870 .data = &init_net.ipv4.sysctl_igmp_qrv, 871 .maxlen = sizeof(int), 872 .mode = 0644, 873 .proc_handler = proc_dointvec_minmax, 874 .extra1 = SYSCTL_ONE 875 }, 876 #endif 877 { 878 .procname = "tcp_congestion_control", 879 .data = &init_net.ipv4.tcp_congestion_control, 880 .mode = 0644, 881 .maxlen = TCP_CA_NAME_MAX, 882 .proc_handler = proc_tcp_congestion_control, 883 }, 884 { 885 .procname = "tcp_available_congestion_control", 886 .maxlen = TCP_CA_BUF_MAX, 887 .mode = 0444, 888 .proc_handler = proc_tcp_available_congestion_control, 889 }, 890 { 891 .procname = "tcp_allowed_congestion_control", 892 .maxlen = TCP_CA_BUF_MAX, 893 .mode = 0644, 894 .proc_handler = proc_allowed_congestion_control, 895 }, 896 { 897 .procname = "tcp_keepalive_time", 898 .data = &init_net.ipv4.sysctl_tcp_keepalive_time, 899 .maxlen = sizeof(int), 900 .mode = 0644, 901 .proc_handler = proc_dointvec_jiffies, 902 }, 903 { 904 .procname = "tcp_keepalive_probes", 905 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes, 906 .maxlen = sizeof(u8), 907 .mode = 0644, 908 .proc_handler = proc_dou8vec_minmax, 909 }, 910 { 911 .procname = "tcp_keepalive_intvl", 912 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl, 913 .maxlen = sizeof(int), 914 .mode = 0644, 915 .proc_handler = proc_dointvec_jiffies, 916 }, 917 { 918 .procname = "tcp_syn_retries", 919 .data = &init_net.ipv4.sysctl_tcp_syn_retries, 920 .maxlen = sizeof(u8), 921 .mode = 0644, 922 .proc_handler = proc_dou8vec_minmax, 923 .extra1 = &tcp_syn_retries_min, 924 .extra2 = &tcp_syn_retries_max 925 }, 926 { 927 .procname = "tcp_synack_retries", 928 .data = &init_net.ipv4.sysctl_tcp_synack_retries, 929 .maxlen = sizeof(u8), 930 .mode = 0644, 931 .proc_handler = proc_dou8vec_minmax, 932 }, 933 #ifdef CONFIG_SYN_COOKIES 934 { 935 .procname = "tcp_syncookies", 936 .data = &init_net.ipv4.sysctl_tcp_syncookies, 937 .maxlen = sizeof(u8), 938 .mode = 0644, 939 .proc_handler = proc_dou8vec_minmax, 940 }, 941 #endif 942 { 943 .procname = "tcp_migrate_req", 944 .data = &init_net.ipv4.sysctl_tcp_migrate_req, 945 .maxlen = sizeof(u8), 946 .mode = 0644, 947 .proc_handler = proc_dou8vec_minmax, 948 .extra1 = SYSCTL_ZERO, 949 .extra2 = SYSCTL_ONE 950 }, 951 { 952 .procname = "tcp_reordering", 953 .data = &init_net.ipv4.sysctl_tcp_reordering, 954 .maxlen = sizeof(int), 955 .mode = 0644, 956 .proc_handler = proc_dointvec 957 }, 958 { 959 .procname = "tcp_retries1", 960 .data = &init_net.ipv4.sysctl_tcp_retries1, 961 .maxlen = sizeof(u8), 962 .mode = 0644, 963 .proc_handler = proc_dou8vec_minmax, 964 .extra2 = &tcp_retr1_max 965 }, 966 { 967 .procname = "tcp_retries2", 968 .data = &init_net.ipv4.sysctl_tcp_retries2, 969 .maxlen = sizeof(u8), 970 .mode = 0644, 971 .proc_handler = proc_dou8vec_minmax, 972 }, 973 { 974 .procname = "tcp_orphan_retries", 975 .data = &init_net.ipv4.sysctl_tcp_orphan_retries, 976 .maxlen = sizeof(u8), 977 .mode = 0644, 978 .proc_handler = proc_dou8vec_minmax, 979 }, 980 { 981 .procname = "tcp_fin_timeout", 982 .data = &init_net.ipv4.sysctl_tcp_fin_timeout, 983 .maxlen = sizeof(int), 984 .mode = 0644, 985 .proc_handler = proc_dointvec_jiffies, 986 }, 987 { 988 .procname = "tcp_notsent_lowat", 989 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat, 990 .maxlen = sizeof(unsigned int), 991 .mode = 0644, 992 .proc_handler = proc_douintvec, 993 }, 994 { 995 .procname = "tcp_tw_reuse", 996 .data = &init_net.ipv4.sysctl_tcp_tw_reuse, 997 .maxlen = sizeof(u8), 998 .mode = 0644, 999 .proc_handler = proc_dou8vec_minmax, 1000 .extra1 = SYSCTL_ZERO, 1001 .extra2 = &two, 1002 }, 1003 { 1004 .procname = "tcp_max_tw_buckets", 1005 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, 1006 .maxlen = sizeof(int), 1007 .mode = 0644, 1008 .proc_handler = proc_dointvec 1009 }, 1010 { 1011 .procname = "tcp_max_syn_backlog", 1012 .data = &init_net.ipv4.sysctl_max_syn_backlog, 1013 .maxlen = sizeof(int), 1014 .mode = 0644, 1015 .proc_handler = proc_dointvec 1016 }, 1017 { 1018 .procname = "tcp_fastopen", 1019 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1020 .maxlen = sizeof(int), 1021 .mode = 0644, 1022 .proc_handler = proc_dointvec, 1023 }, 1024 { 1025 .procname = "tcp_fastopen_key", 1026 .mode = 0600, 1027 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1028 /* maxlen to print the list of keys in hex (*2), with dashes 1029 * separating doublewords and a comma in between keys. 1030 */ 1031 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 1032 2 * TCP_FASTOPEN_KEY_MAX) + 1033 (TCP_FASTOPEN_KEY_MAX * 5)), 1034 .proc_handler = proc_tcp_fastopen_key, 1035 }, 1036 { 1037 .procname = "tcp_fastopen_blackhole_timeout_sec", 1038 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout, 1039 .maxlen = sizeof(int), 1040 .mode = 0644, 1041 .proc_handler = proc_tfo_blackhole_detect_timeout, 1042 .extra1 = SYSCTL_ZERO, 1043 }, 1044 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1045 { 1046 .procname = "fib_multipath_use_neigh", 1047 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh, 1048 .maxlen = sizeof(u8), 1049 .mode = 0644, 1050 .proc_handler = proc_dou8vec_minmax, 1051 .extra1 = SYSCTL_ZERO, 1052 .extra2 = SYSCTL_ONE, 1053 }, 1054 { 1055 .procname = "fib_multipath_hash_policy", 1056 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy, 1057 .maxlen = sizeof(u8), 1058 .mode = 0644, 1059 .proc_handler = proc_fib_multipath_hash_policy, 1060 .extra1 = SYSCTL_ZERO, 1061 .extra2 = &three, 1062 }, 1063 { 1064 .procname = "fib_multipath_hash_fields", 1065 .data = &init_net.ipv4.sysctl_fib_multipath_hash_fields, 1066 .maxlen = sizeof(u32), 1067 .mode = 0644, 1068 .proc_handler = proc_fib_multipath_hash_fields, 1069 .extra1 = SYSCTL_ONE, 1070 .extra2 = &fib_multipath_hash_fields_all_mask, 1071 }, 1072 #endif 1073 { 1074 .procname = "ip_unprivileged_port_start", 1075 .maxlen = sizeof(int), 1076 .data = &init_net.ipv4.sysctl_ip_prot_sock, 1077 .mode = 0644, 1078 .proc_handler = ipv4_privileged_ports, 1079 }, 1080 #ifdef CONFIG_NET_L3_MASTER_DEV 1081 { 1082 .procname = "udp_l3mdev_accept", 1083 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept, 1084 .maxlen = sizeof(u8), 1085 .mode = 0644, 1086 .proc_handler = proc_dou8vec_minmax, 1087 .extra1 = SYSCTL_ZERO, 1088 .extra2 = SYSCTL_ONE, 1089 }, 1090 #endif 1091 { 1092 .procname = "tcp_sack", 1093 .data = &init_net.ipv4.sysctl_tcp_sack, 1094 .maxlen = sizeof(u8), 1095 .mode = 0644, 1096 .proc_handler = proc_dou8vec_minmax, 1097 }, 1098 { 1099 .procname = "tcp_window_scaling", 1100 .data = &init_net.ipv4.sysctl_tcp_window_scaling, 1101 .maxlen = sizeof(u8), 1102 .mode = 0644, 1103 .proc_handler = proc_dou8vec_minmax, 1104 }, 1105 { 1106 .procname = "tcp_timestamps", 1107 .data = &init_net.ipv4.sysctl_tcp_timestamps, 1108 .maxlen = sizeof(u8), 1109 .mode = 0644, 1110 .proc_handler = proc_dou8vec_minmax, 1111 }, 1112 { 1113 .procname = "tcp_early_retrans", 1114 .data = &init_net.ipv4.sysctl_tcp_early_retrans, 1115 .maxlen = sizeof(u8), 1116 .mode = 0644, 1117 .proc_handler = proc_dou8vec_minmax, 1118 .extra1 = SYSCTL_ZERO, 1119 .extra2 = &four, 1120 }, 1121 { 1122 .procname = "tcp_recovery", 1123 .data = &init_net.ipv4.sysctl_tcp_recovery, 1124 .maxlen = sizeof(u8), 1125 .mode = 0644, 1126 .proc_handler = proc_dou8vec_minmax, 1127 }, 1128 { 1129 .procname = "tcp_thin_linear_timeouts", 1130 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts, 1131 .maxlen = sizeof(u8), 1132 .mode = 0644, 1133 .proc_handler = proc_dou8vec_minmax, 1134 }, 1135 { 1136 .procname = "tcp_slow_start_after_idle", 1137 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle, 1138 .maxlen = sizeof(u8), 1139 .mode = 0644, 1140 .proc_handler = proc_dou8vec_minmax, 1141 }, 1142 { 1143 .procname = "tcp_retrans_collapse", 1144 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse, 1145 .maxlen = sizeof(u8), 1146 .mode = 0644, 1147 .proc_handler = proc_dou8vec_minmax, 1148 }, 1149 { 1150 .procname = "tcp_stdurg", 1151 .data = &init_net.ipv4.sysctl_tcp_stdurg, 1152 .maxlen = sizeof(u8), 1153 .mode = 0644, 1154 .proc_handler = proc_dou8vec_minmax, 1155 }, 1156 { 1157 .procname = "tcp_rfc1337", 1158 .data = &init_net.ipv4.sysctl_tcp_rfc1337, 1159 .maxlen = sizeof(u8), 1160 .mode = 0644, 1161 .proc_handler = proc_dou8vec_minmax, 1162 }, 1163 { 1164 .procname = "tcp_abort_on_overflow", 1165 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow, 1166 .maxlen = sizeof(u8), 1167 .mode = 0644, 1168 .proc_handler = proc_dou8vec_minmax, 1169 }, 1170 { 1171 .procname = "tcp_fack", 1172 .data = &init_net.ipv4.sysctl_tcp_fack, 1173 .maxlen = sizeof(u8), 1174 .mode = 0644, 1175 .proc_handler = proc_dou8vec_minmax, 1176 }, 1177 { 1178 .procname = "tcp_max_reordering", 1179 .data = &init_net.ipv4.sysctl_tcp_max_reordering, 1180 .maxlen = sizeof(int), 1181 .mode = 0644, 1182 .proc_handler = proc_dointvec 1183 }, 1184 { 1185 .procname = "tcp_dsack", 1186 .data = &init_net.ipv4.sysctl_tcp_dsack, 1187 .maxlen = sizeof(u8), 1188 .mode = 0644, 1189 .proc_handler = proc_dou8vec_minmax, 1190 }, 1191 { 1192 .procname = "tcp_app_win", 1193 .data = &init_net.ipv4.sysctl_tcp_app_win, 1194 .maxlen = sizeof(u8), 1195 .mode = 0644, 1196 .proc_handler = proc_dou8vec_minmax, 1197 }, 1198 { 1199 .procname = "tcp_adv_win_scale", 1200 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale, 1201 .maxlen = sizeof(int), 1202 .mode = 0644, 1203 .proc_handler = proc_dointvec_minmax, 1204 .extra1 = &tcp_adv_win_scale_min, 1205 .extra2 = &tcp_adv_win_scale_max, 1206 }, 1207 { 1208 .procname = "tcp_frto", 1209 .data = &init_net.ipv4.sysctl_tcp_frto, 1210 .maxlen = sizeof(u8), 1211 .mode = 0644, 1212 .proc_handler = proc_dou8vec_minmax, 1213 }, 1214 { 1215 .procname = "tcp_no_metrics_save", 1216 .data = &init_net.ipv4.sysctl_tcp_nometrics_save, 1217 .maxlen = sizeof(u8), 1218 .mode = 0644, 1219 .proc_handler = proc_dou8vec_minmax, 1220 }, 1221 { 1222 .procname = "tcp_no_ssthresh_metrics_save", 1223 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save, 1224 .maxlen = sizeof(u8), 1225 .mode = 0644, 1226 .proc_handler = proc_dou8vec_minmax, 1227 .extra1 = SYSCTL_ZERO, 1228 .extra2 = SYSCTL_ONE, 1229 }, 1230 { 1231 .procname = "tcp_moderate_rcvbuf", 1232 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf, 1233 .maxlen = sizeof(u8), 1234 .mode = 0644, 1235 .proc_handler = proc_dou8vec_minmax, 1236 }, 1237 { 1238 .procname = "tcp_tso_win_divisor", 1239 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor, 1240 .maxlen = sizeof(u8), 1241 .mode = 0644, 1242 .proc_handler = proc_dou8vec_minmax, 1243 }, 1244 { 1245 .procname = "tcp_workaround_signed_windows", 1246 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows, 1247 .maxlen = sizeof(u8), 1248 .mode = 0644, 1249 .proc_handler = proc_dou8vec_minmax, 1250 }, 1251 { 1252 .procname = "tcp_limit_output_bytes", 1253 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes, 1254 .maxlen = sizeof(int), 1255 .mode = 0644, 1256 .proc_handler = proc_dointvec 1257 }, 1258 { 1259 .procname = "tcp_challenge_ack_limit", 1260 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit, 1261 .maxlen = sizeof(int), 1262 .mode = 0644, 1263 .proc_handler = proc_dointvec 1264 }, 1265 { 1266 .procname = "tcp_min_tso_segs", 1267 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs, 1268 .maxlen = sizeof(u8), 1269 .mode = 0644, 1270 .proc_handler = proc_dou8vec_minmax, 1271 .extra1 = SYSCTL_ONE, 1272 }, 1273 { 1274 .procname = "tcp_min_rtt_wlen", 1275 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen, 1276 .maxlen = sizeof(int), 1277 .mode = 0644, 1278 .proc_handler = proc_dointvec_minmax, 1279 .extra1 = SYSCTL_ZERO, 1280 .extra2 = &one_day_secs 1281 }, 1282 { 1283 .procname = "tcp_autocorking", 1284 .data = &init_net.ipv4.sysctl_tcp_autocorking, 1285 .maxlen = sizeof(u8), 1286 .mode = 0644, 1287 .proc_handler = proc_dou8vec_minmax, 1288 .extra1 = SYSCTL_ZERO, 1289 .extra2 = SYSCTL_ONE, 1290 }, 1291 { 1292 .procname = "tcp_invalid_ratelimit", 1293 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit, 1294 .maxlen = sizeof(int), 1295 .mode = 0644, 1296 .proc_handler = proc_dointvec_ms_jiffies, 1297 }, 1298 { 1299 .procname = "tcp_pacing_ss_ratio", 1300 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio, 1301 .maxlen = sizeof(int), 1302 .mode = 0644, 1303 .proc_handler = proc_dointvec_minmax, 1304 .extra1 = SYSCTL_ZERO, 1305 .extra2 = &thousand, 1306 }, 1307 { 1308 .procname = "tcp_pacing_ca_ratio", 1309 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio, 1310 .maxlen = sizeof(int), 1311 .mode = 0644, 1312 .proc_handler = proc_dointvec_minmax, 1313 .extra1 = SYSCTL_ZERO, 1314 .extra2 = &thousand, 1315 }, 1316 { 1317 .procname = "tcp_wmem", 1318 .data = &init_net.ipv4.sysctl_tcp_wmem, 1319 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem), 1320 .mode = 0644, 1321 .proc_handler = proc_dointvec_minmax, 1322 .extra1 = SYSCTL_ONE, 1323 }, 1324 { 1325 .procname = "tcp_rmem", 1326 .data = &init_net.ipv4.sysctl_tcp_rmem, 1327 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem), 1328 .mode = 0644, 1329 .proc_handler = proc_dointvec_minmax, 1330 .extra1 = SYSCTL_ONE, 1331 }, 1332 { 1333 .procname = "tcp_comp_sack_delay_ns", 1334 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns, 1335 .maxlen = sizeof(unsigned long), 1336 .mode = 0644, 1337 .proc_handler = proc_doulongvec_minmax, 1338 }, 1339 { 1340 .procname = "tcp_comp_sack_slack_ns", 1341 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns, 1342 .maxlen = sizeof(unsigned long), 1343 .mode = 0644, 1344 .proc_handler = proc_doulongvec_minmax, 1345 }, 1346 { 1347 .procname = "tcp_comp_sack_nr", 1348 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr, 1349 .maxlen = sizeof(u8), 1350 .mode = 0644, 1351 .proc_handler = proc_dou8vec_minmax, 1352 .extra1 = SYSCTL_ZERO, 1353 }, 1354 { 1355 .procname = "tcp_reflect_tos", 1356 .data = &init_net.ipv4.sysctl_tcp_reflect_tos, 1357 .maxlen = sizeof(u8), 1358 .mode = 0644, 1359 .proc_handler = proc_dou8vec_minmax, 1360 .extra1 = SYSCTL_ZERO, 1361 .extra2 = SYSCTL_ONE, 1362 }, 1363 { 1364 .procname = "udp_rmem_min", 1365 .data = &init_net.ipv4.sysctl_udp_rmem_min, 1366 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min), 1367 .mode = 0644, 1368 .proc_handler = proc_dointvec_minmax, 1369 .extra1 = SYSCTL_ONE 1370 }, 1371 { 1372 .procname = "udp_wmem_min", 1373 .data = &init_net.ipv4.sysctl_udp_wmem_min, 1374 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min), 1375 .mode = 0644, 1376 .proc_handler = proc_dointvec_minmax, 1377 .extra1 = SYSCTL_ONE 1378 }, 1379 { 1380 .procname = "fib_notify_on_flag_change", 1381 .data = &init_net.ipv4.sysctl_fib_notify_on_flag_change, 1382 .maxlen = sizeof(u8), 1383 .mode = 0644, 1384 .proc_handler = proc_dou8vec_minmax, 1385 .extra1 = SYSCTL_ZERO, 1386 .extra2 = &two, 1387 }, 1388 { } 1389 }; 1390 1391 static __net_init int ipv4_sysctl_init_net(struct net *net) 1392 { 1393 struct ctl_table *table; 1394 1395 table = ipv4_net_table; 1396 if (!net_eq(net, &init_net)) { 1397 int i; 1398 1399 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); 1400 if (!table) 1401 goto err_alloc; 1402 1403 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) { 1404 if (table[i].data) { 1405 /* Update the variables to point into 1406 * the current struct net 1407 */ 1408 table[i].data += (void *)net - (void *)&init_net; 1409 } else { 1410 /* Entries without data pointer are global; 1411 * Make them read-only in non-init_net ns 1412 */ 1413 table[i].mode &= ~0222; 1414 } 1415 } 1416 } 1417 1418 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table); 1419 if (!net->ipv4.ipv4_hdr) 1420 goto err_reg; 1421 1422 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1423 if (!net->ipv4.sysctl_local_reserved_ports) 1424 goto err_ports; 1425 1426 return 0; 1427 1428 err_ports: 1429 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1430 err_reg: 1431 if (!net_eq(net, &init_net)) 1432 kfree(table); 1433 err_alloc: 1434 return -ENOMEM; 1435 } 1436 1437 static __net_exit void ipv4_sysctl_exit_net(struct net *net) 1438 { 1439 struct ctl_table *table; 1440 1441 kfree(net->ipv4.sysctl_local_reserved_ports); 1442 table = net->ipv4.ipv4_hdr->ctl_table_arg; 1443 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1444 kfree(table); 1445 } 1446 1447 static __net_initdata struct pernet_operations ipv4_sysctl_ops = { 1448 .init = ipv4_sysctl_init_net, 1449 .exit = ipv4_sysctl_exit_net, 1450 }; 1451 1452 static __init int sysctl_ipv4_init(void) 1453 { 1454 struct ctl_table_header *hdr; 1455 1456 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table); 1457 if (!hdr) 1458 return -ENOMEM; 1459 1460 if (register_pernet_subsys(&ipv4_sysctl_ops)) { 1461 unregister_net_sysctl_table(hdr); 1462 return -ENOMEM; 1463 } 1464 1465 return 0; 1466 } 1467 1468 __initcall(sysctl_ipv4_init); 1469