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