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_app_win_max = 31; 29 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS; 30 static int tcp_min_snd_mss_max = 65535; 31 static int tcp_rto_max_max = TCP_RTO_MAX_SEC * MSEC_PER_SEC; 32 static int ip_privileged_port_min; 33 static int ip_privileged_port_max = 65535; 34 static int ip_ttl_min = 1; 35 static int ip_ttl_max = 255; 36 static int tcp_syn_retries_min = 1; 37 static int tcp_syn_retries_max = MAX_TCP_SYNCNT; 38 static int tcp_syn_linear_timeouts_max = MAX_TCP_SYNCNT; 39 static unsigned long ip_ping_group_range_min[] = { 0, 0 }; 40 static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX }; 41 static u32 u32_max_div_HZ = UINT_MAX / HZ; 42 static int one_day_secs = 24 * 3600; 43 static u32 fib_multipath_hash_fields_all_mask __maybe_unused = 44 FIB_MULTIPATH_HASH_FIELD_ALL_MASK; 45 static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024; 46 static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX; 47 static int tcp_plb_max_rounds = 31; 48 static int tcp_plb_max_cong_thresh = 256; 49 static unsigned int tcp_tw_reuse_delay_max = TCP_PAWS_MSL * MSEC_PER_SEC; 50 static int tcp_ecn_mode_max = 2; 51 52 /* obsolete */ 53 static int sysctl_tcp_low_latency __read_mostly; 54 55 /* Update system visible IP port range */ 56 static void set_local_port_range(struct net *net, unsigned int low, unsigned int high) 57 { 58 bool same_parity = !((low ^ high) & 1); 59 60 if (same_parity && !net->ipv4.ip_local_ports.warned) { 61 net->ipv4.ip_local_ports.warned = true; 62 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n"); 63 } 64 WRITE_ONCE(net->ipv4.ip_local_ports.range, high << 16 | low); 65 } 66 67 /* Validate changes from /proc interface. */ 68 static int ipv4_local_port_range(const struct ctl_table *table, int write, 69 void *buffer, size_t *lenp, loff_t *ppos) 70 { 71 struct net *net = table->data; 72 int ret; 73 int range[2]; 74 struct ctl_table tmp = { 75 .data = &range, 76 .maxlen = sizeof(range), 77 .mode = table->mode, 78 .extra1 = &ip_local_port_range_min, 79 .extra2 = &ip_local_port_range_max, 80 }; 81 82 inet_get_local_port_range(net, &range[0], &range[1]); 83 84 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 85 86 if (write && ret == 0) { 87 /* Ensure that the upper limit is not smaller than the lower, 88 * and that the lower does not encroach upon the privileged 89 * port limit. 90 */ 91 if ((range[1] < range[0]) || 92 (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock))) 93 ret = -EINVAL; 94 else 95 set_local_port_range(net, range[0], range[1]); 96 } 97 98 return ret; 99 } 100 101 /* Validate changes from /proc interface. */ 102 static int ipv4_privileged_ports(const struct ctl_table *table, int write, 103 void *buffer, size_t *lenp, loff_t *ppos) 104 { 105 struct net *net = container_of(table->data, struct net, 106 ipv4.sysctl_ip_prot_sock); 107 int ret; 108 int pports; 109 int range[2]; 110 struct ctl_table tmp = { 111 .data = &pports, 112 .maxlen = sizeof(pports), 113 .mode = table->mode, 114 .extra1 = &ip_privileged_port_min, 115 .extra2 = &ip_privileged_port_max, 116 }; 117 118 pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock); 119 120 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 121 122 if (write && ret == 0) { 123 inet_get_local_port_range(net, &range[0], &range[1]); 124 /* Ensure that the local port range doesn't overlap with the 125 * privileged port range. 126 */ 127 if (range[0] < pports) 128 ret = -EINVAL; 129 else 130 WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports); 131 } 132 133 return ret; 134 } 135 136 static void inet_get_ping_group_range_table(const struct ctl_table *table, 137 kgid_t *low, kgid_t *high) 138 { 139 kgid_t *data = table->data; 140 struct net *net = 141 container_of(table->data, struct net, ipv4.ping_group_range.range); 142 unsigned int seq; 143 do { 144 seq = read_seqbegin(&net->ipv4.ping_group_range.lock); 145 146 *low = data[0]; 147 *high = data[1]; 148 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); 149 } 150 151 /* Update system visible IP port range */ 152 static void set_ping_group_range(const struct ctl_table *table, 153 kgid_t low, kgid_t high) 154 { 155 kgid_t *data = table->data; 156 struct net *net = 157 container_of(table->data, struct net, ipv4.ping_group_range.range); 158 write_seqlock(&net->ipv4.ping_group_range.lock); 159 data[0] = low; 160 data[1] = high; 161 write_sequnlock(&net->ipv4.ping_group_range.lock); 162 } 163 164 /* Validate changes from /proc interface. */ 165 static int ipv4_ping_group_range(const struct ctl_table *table, int write, 166 void *buffer, size_t *lenp, loff_t *ppos) 167 { 168 struct user_namespace *user_ns = current_user_ns(); 169 int ret; 170 unsigned long urange[2]; 171 kgid_t low, high; 172 struct ctl_table tmp = { 173 .data = &urange, 174 .maxlen = sizeof(urange), 175 .mode = table->mode, 176 .extra1 = &ip_ping_group_range_min, 177 .extra2 = &ip_ping_group_range_max, 178 }; 179 180 inet_get_ping_group_range_table(table, &low, &high); 181 urange[0] = from_kgid_munged(user_ns, low); 182 urange[1] = from_kgid_munged(user_ns, high); 183 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos); 184 185 if (write && ret == 0) { 186 low = make_kgid(user_ns, urange[0]); 187 high = make_kgid(user_ns, urange[1]); 188 if (!gid_valid(low) || !gid_valid(high)) 189 return -EINVAL; 190 if (urange[1] < urange[0] || gid_lt(high, low)) { 191 low = make_kgid(&init_user_ns, 1); 192 high = make_kgid(&init_user_ns, 0); 193 } 194 set_ping_group_range(table, low, high); 195 } 196 197 return ret; 198 } 199 200 static int ipv4_fwd_update_priority(const struct ctl_table *table, int write, 201 void *buffer, size_t *lenp, loff_t *ppos) 202 { 203 struct net *net; 204 int ret; 205 206 net = container_of(table->data, struct net, 207 ipv4.sysctl_ip_fwd_update_priority); 208 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 209 if (write && ret == 0) 210 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE, 211 net); 212 213 return ret; 214 } 215 216 static int proc_tcp_congestion_control(const struct ctl_table *ctl, int write, 217 void *buffer, size_t *lenp, loff_t *ppos) 218 { 219 struct net *net = container_of(ctl->data, struct net, 220 ipv4.tcp_congestion_control); 221 char val[TCP_CA_NAME_MAX]; 222 struct ctl_table tbl = { 223 .data = val, 224 .maxlen = TCP_CA_NAME_MAX, 225 }; 226 int ret; 227 228 tcp_get_default_congestion_control(net, val); 229 230 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 231 if (write && ret == 0) 232 ret = tcp_set_default_congestion_control(net, val); 233 return ret; 234 } 235 236 static int proc_tcp_available_congestion_control(const struct ctl_table *ctl, 237 int write, void *buffer, 238 size_t *lenp, loff_t *ppos) 239 { 240 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, }; 241 int ret; 242 243 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 244 if (!tbl.data) 245 return -ENOMEM; 246 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX); 247 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 248 kfree(tbl.data); 249 return ret; 250 } 251 252 static int proc_allowed_congestion_control(const struct ctl_table *ctl, 253 int write, void *buffer, 254 size_t *lenp, loff_t *ppos) 255 { 256 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX }; 257 int ret; 258 259 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 260 if (!tbl.data) 261 return -ENOMEM; 262 263 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen); 264 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 265 if (write && ret == 0) 266 ret = tcp_set_allowed_congestion_control(tbl.data); 267 kfree(tbl.data); 268 return ret; 269 } 270 271 static int sscanf_key(char *buf, __le32 *key) 272 { 273 u32 user_key[4]; 274 int i, ret = 0; 275 276 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1, 277 user_key + 2, user_key + 3) != 4) { 278 ret = -EINVAL; 279 } else { 280 for (i = 0; i < ARRAY_SIZE(user_key); i++) 281 key[i] = cpu_to_le32(user_key[i]); 282 } 283 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n", 284 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret); 285 286 return ret; 287 } 288 289 static int proc_tcp_fastopen_key(const struct ctl_table *table, int write, 290 void *buffer, size_t *lenp, loff_t *ppos) 291 { 292 struct net *net = container_of(table->data, struct net, 293 ipv4.sysctl_tcp_fastopen); 294 /* maxlen to print the list of keys in hex (*2), with dashes 295 * separating doublewords and a comma in between keys. 296 */ 297 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 298 2 * TCP_FASTOPEN_KEY_MAX) + 299 (TCP_FASTOPEN_KEY_MAX * 5)) }; 300 u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)]; 301 __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)]; 302 char *backup_data; 303 int ret, i = 0, off = 0, n_keys; 304 305 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL); 306 if (!tbl.data) 307 return -ENOMEM; 308 309 n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key); 310 if (!n_keys) { 311 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH); 312 n_keys = 1; 313 } 314 315 for (i = 0; i < n_keys * 4; i++) 316 user_key[i] = le32_to_cpu(key[i]); 317 318 for (i = 0; i < n_keys; i++) { 319 off += snprintf(tbl.data + off, tbl.maxlen - off, 320 "%08x-%08x-%08x-%08x", 321 user_key[i * 4], 322 user_key[i * 4 + 1], 323 user_key[i * 4 + 2], 324 user_key[i * 4 + 3]); 325 326 if (WARN_ON_ONCE(off >= tbl.maxlen - 1)) 327 break; 328 329 if (i + 1 < n_keys) 330 off += snprintf(tbl.data + off, tbl.maxlen - off, ","); 331 } 332 333 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 334 335 if (write && ret == 0) { 336 backup_data = strchr(tbl.data, ','); 337 if (backup_data) { 338 *backup_data = '\0'; 339 backup_data++; 340 } 341 if (sscanf_key(tbl.data, key)) { 342 ret = -EINVAL; 343 goto bad_key; 344 } 345 if (backup_data) { 346 if (sscanf_key(backup_data, key + 4)) { 347 ret = -EINVAL; 348 goto bad_key; 349 } 350 } 351 tcp_fastopen_reset_cipher(net, NULL, key, 352 backup_data ? key + 4 : NULL); 353 } 354 355 bad_key: 356 kfree(tbl.data); 357 return ret; 358 } 359 360 static int proc_tfo_blackhole_detect_timeout(const struct ctl_table *table, 361 int write, void *buffer, 362 size_t *lenp, loff_t *ppos) 363 { 364 struct net *net = container_of(table->data, struct net, 365 ipv4.sysctl_tcp_fastopen_blackhole_timeout); 366 int ret; 367 368 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 369 if (write && ret == 0) 370 atomic_set(&net->ipv4.tfo_active_disable_times, 0); 371 372 return ret; 373 } 374 375 static int proc_tcp_available_ulp(const struct ctl_table *ctl, 376 int write, void *buffer, size_t *lenp, 377 loff_t *ppos) 378 { 379 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, }; 380 int ret; 381 382 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 383 if (!tbl.data) 384 return -ENOMEM; 385 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX); 386 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 387 kfree(tbl.data); 388 389 return ret; 390 } 391 392 static int proc_tcp_ehash_entries(const struct ctl_table *table, int write, 393 void *buffer, size_t *lenp, loff_t *ppos) 394 { 395 struct net *net = container_of(table->data, struct net, 396 ipv4.sysctl_tcp_child_ehash_entries); 397 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo; 398 int tcp_ehash_entries; 399 struct ctl_table tbl; 400 401 tcp_ehash_entries = hinfo->ehash_mask + 1; 402 403 /* A negative number indicates that the child netns 404 * shares the global ehash. 405 */ 406 if (!net_eq(net, &init_net) && !hinfo->pernet) 407 tcp_ehash_entries *= -1; 408 409 memset(&tbl, 0, sizeof(tbl)); 410 tbl.data = &tcp_ehash_entries; 411 tbl.maxlen = sizeof(int); 412 413 return proc_dointvec(&tbl, write, buffer, lenp, ppos); 414 } 415 416 static int proc_udp_hash_entries(const struct ctl_table *table, int write, 417 void *buffer, size_t *lenp, loff_t *ppos) 418 { 419 struct net *net = container_of(table->data, struct net, 420 ipv4.sysctl_udp_child_hash_entries); 421 int udp_hash_entries; 422 struct ctl_table tbl; 423 424 udp_hash_entries = net->ipv4.udp_table->mask + 1; 425 426 /* A negative number indicates that the child netns 427 * shares the global udp_table. 428 */ 429 if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table) 430 udp_hash_entries *= -1; 431 432 memset(&tbl, 0, sizeof(tbl)); 433 tbl.data = &udp_hash_entries; 434 tbl.maxlen = sizeof(int); 435 436 return proc_dointvec(&tbl, write, buffer, lenp, ppos); 437 } 438 439 #ifdef CONFIG_IP_ROUTE_MULTIPATH 440 static int proc_fib_multipath_hash_policy(const struct ctl_table *table, int write, 441 void *buffer, size_t *lenp, 442 loff_t *ppos) 443 { 444 struct net *net = container_of(table->data, struct net, 445 ipv4.sysctl_fib_multipath_hash_policy); 446 int ret; 447 448 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 449 if (write && ret == 0) 450 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 451 452 return ret; 453 } 454 455 static int proc_fib_multipath_hash_fields(const struct ctl_table *table, int write, 456 void *buffer, size_t *lenp, 457 loff_t *ppos) 458 { 459 struct net *net; 460 int ret; 461 462 net = container_of(table->data, struct net, 463 ipv4.sysctl_fib_multipath_hash_fields); 464 ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos); 465 if (write && ret == 0) 466 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 467 468 return ret; 469 } 470 471 static u32 proc_fib_multipath_hash_rand_seed __ro_after_init; 472 473 static void proc_fib_multipath_hash_init_rand_seed(void) 474 { 475 get_random_bytes(&proc_fib_multipath_hash_rand_seed, 476 sizeof(proc_fib_multipath_hash_rand_seed)); 477 } 478 479 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed) 480 { 481 struct sysctl_fib_multipath_hash_seed new = { 482 .user_seed = user_seed, 483 .mp_seed = (user_seed ? user_seed : 484 proc_fib_multipath_hash_rand_seed), 485 }; 486 487 WRITE_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed, new); 488 } 489 490 static int proc_fib_multipath_hash_seed(const struct ctl_table *table, int write, 491 void *buffer, size_t *lenp, 492 loff_t *ppos) 493 { 494 struct sysctl_fib_multipath_hash_seed *mphs; 495 struct net *net = table->data; 496 struct ctl_table tmp; 497 u32 user_seed; 498 int ret; 499 500 mphs = &net->ipv4.sysctl_fib_multipath_hash_seed; 501 user_seed = mphs->user_seed; 502 503 tmp = *table; 504 tmp.data = &user_seed; 505 506 ret = proc_douintvec_minmax(&tmp, write, buffer, lenp, ppos); 507 508 if (write && ret == 0) { 509 proc_fib_multipath_hash_set_seed(net, user_seed); 510 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 511 } 512 513 return ret; 514 } 515 #else 516 517 static void proc_fib_multipath_hash_init_rand_seed(void) 518 { 519 } 520 521 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed) 522 { 523 } 524 525 #endif 526 527 static struct ctl_table ipv4_table[] = { 528 { 529 .procname = "tcp_max_orphans", 530 .data = &sysctl_tcp_max_orphans, 531 .maxlen = sizeof(int), 532 .mode = 0644, 533 .proc_handler = proc_dointvec 534 }, 535 { 536 .procname = "inet_peer_threshold", 537 .data = &inet_peer_threshold, 538 .maxlen = sizeof(int), 539 .mode = 0644, 540 .proc_handler = proc_dointvec 541 }, 542 { 543 .procname = "inet_peer_minttl", 544 .data = &inet_peer_minttl, 545 .maxlen = sizeof(int), 546 .mode = 0644, 547 .proc_handler = proc_dointvec_jiffies, 548 }, 549 { 550 .procname = "inet_peer_maxttl", 551 .data = &inet_peer_maxttl, 552 .maxlen = sizeof(int), 553 .mode = 0644, 554 .proc_handler = proc_dointvec_jiffies, 555 }, 556 { 557 .procname = "tcp_mem", 558 .maxlen = sizeof(sysctl_tcp_mem), 559 .data = &sysctl_tcp_mem, 560 .mode = 0644, 561 .proc_handler = proc_doulongvec_minmax, 562 }, 563 { 564 .procname = "tcp_low_latency", 565 .data = &sysctl_tcp_low_latency, 566 .maxlen = sizeof(int), 567 .mode = 0644, 568 .proc_handler = proc_dointvec 569 }, 570 #ifdef CONFIG_NETLABEL 571 { 572 .procname = "cipso_cache_enable", 573 .data = &cipso_v4_cache_enabled, 574 .maxlen = sizeof(int), 575 .mode = 0644, 576 .proc_handler = proc_dointvec, 577 }, 578 { 579 .procname = "cipso_cache_bucket_size", 580 .data = &cipso_v4_cache_bucketsize, 581 .maxlen = sizeof(int), 582 .mode = 0644, 583 .proc_handler = proc_dointvec, 584 }, 585 { 586 .procname = "cipso_rbm_optfmt", 587 .data = &cipso_v4_rbm_optfmt, 588 .maxlen = sizeof(int), 589 .mode = 0644, 590 .proc_handler = proc_dointvec, 591 }, 592 { 593 .procname = "cipso_rbm_strictvalid", 594 .data = &cipso_v4_rbm_strictvalid, 595 .maxlen = sizeof(int), 596 .mode = 0644, 597 .proc_handler = proc_dointvec, 598 }, 599 #endif /* CONFIG_NETLABEL */ 600 { 601 .procname = "tcp_available_ulp", 602 .maxlen = TCP_ULP_BUF_MAX, 603 .mode = 0444, 604 .proc_handler = proc_tcp_available_ulp, 605 }, 606 { 607 .procname = "udp_mem", 608 .data = &sysctl_udp_mem, 609 .maxlen = sizeof(sysctl_udp_mem), 610 .mode = 0644, 611 .proc_handler = proc_doulongvec_minmax, 612 }, 613 { 614 .procname = "fib_sync_mem", 615 .data = &sysctl_fib_sync_mem, 616 .maxlen = sizeof(sysctl_fib_sync_mem), 617 .mode = 0644, 618 .proc_handler = proc_douintvec_minmax, 619 .extra1 = &sysctl_fib_sync_mem_min, 620 .extra2 = &sysctl_fib_sync_mem_max, 621 }, 622 }; 623 624 static struct ctl_table ipv4_net_table[] = { 625 { 626 .procname = "tcp_max_tw_buckets", 627 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, 628 .maxlen = sizeof(int), 629 .mode = 0644, 630 .proc_handler = proc_dointvec 631 }, 632 { 633 .procname = "icmp_echo_ignore_all", 634 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, 635 .maxlen = sizeof(u8), 636 .mode = 0644, 637 .proc_handler = proc_dou8vec_minmax, 638 .extra1 = SYSCTL_ZERO, 639 .extra2 = SYSCTL_ONE 640 }, 641 { 642 .procname = "icmp_echo_enable_probe", 643 .data = &init_net.ipv4.sysctl_icmp_echo_enable_probe, 644 .maxlen = sizeof(u8), 645 .mode = 0644, 646 .proc_handler = proc_dou8vec_minmax, 647 .extra1 = SYSCTL_ZERO, 648 .extra2 = SYSCTL_ONE 649 }, 650 { 651 .procname = "icmp_echo_ignore_broadcasts", 652 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, 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 = "icmp_ignore_bogus_error_responses", 661 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, 662 .maxlen = sizeof(u8), 663 .mode = 0644, 664 .proc_handler = proc_dou8vec_minmax, 665 .extra1 = SYSCTL_ZERO, 666 .extra2 = SYSCTL_ONE 667 }, 668 { 669 .procname = "icmp_errors_use_inbound_ifaddr", 670 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, 671 .maxlen = sizeof(u8), 672 .mode = 0644, 673 .proc_handler = proc_dou8vec_minmax, 674 .extra1 = SYSCTL_ZERO, 675 .extra2 = SYSCTL_ONE 676 }, 677 { 678 .procname = "icmp_ratelimit", 679 .data = &init_net.ipv4.sysctl_icmp_ratelimit, 680 .maxlen = sizeof(int), 681 .mode = 0644, 682 .proc_handler = proc_dointvec_ms_jiffies, 683 }, 684 { 685 .procname = "icmp_ratemask", 686 .data = &init_net.ipv4.sysctl_icmp_ratemask, 687 .maxlen = sizeof(int), 688 .mode = 0644, 689 .proc_handler = proc_dointvec 690 }, 691 { 692 .procname = "icmp_msgs_per_sec", 693 .data = &init_net.ipv4.sysctl_icmp_msgs_per_sec, 694 .maxlen = sizeof(int), 695 .mode = 0644, 696 .proc_handler = proc_dointvec_minmax, 697 .extra1 = SYSCTL_ZERO, 698 }, 699 { 700 .procname = "icmp_msgs_burst", 701 .data = &init_net.ipv4.sysctl_icmp_msgs_burst, 702 .maxlen = sizeof(int), 703 .mode = 0644, 704 .proc_handler = proc_dointvec_minmax, 705 .extra1 = SYSCTL_ZERO, 706 }, 707 { 708 .procname = "ping_group_range", 709 .data = &init_net.ipv4.ping_group_range.range, 710 .maxlen = sizeof(gid_t)*2, 711 .mode = 0644, 712 .proc_handler = ipv4_ping_group_range, 713 }, 714 #ifdef CONFIG_NET_L3_MASTER_DEV 715 { 716 .procname = "raw_l3mdev_accept", 717 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept, 718 .maxlen = sizeof(u8), 719 .mode = 0644, 720 .proc_handler = proc_dou8vec_minmax, 721 .extra1 = SYSCTL_ZERO, 722 .extra2 = SYSCTL_ONE, 723 }, 724 #endif 725 { 726 .procname = "tcp_ecn", 727 .data = &init_net.ipv4.sysctl_tcp_ecn, 728 .maxlen = sizeof(u8), 729 .mode = 0644, 730 .proc_handler = proc_dou8vec_minmax, 731 .extra1 = SYSCTL_ZERO, 732 .extra2 = &tcp_ecn_mode_max, 733 }, 734 { 735 .procname = "tcp_ecn_option", 736 .data = &init_net.ipv4.sysctl_tcp_ecn_option, 737 .maxlen = sizeof(u8), 738 .mode = 0644, 739 .proc_handler = proc_dou8vec_minmax, 740 .extra1 = SYSCTL_ZERO, 741 .extra2 = SYSCTL_TWO, 742 }, 743 { 744 .procname = "tcp_ecn_option_beacon", 745 .data = &init_net.ipv4.sysctl_tcp_ecn_option_beacon, 746 .maxlen = sizeof(u8), 747 .mode = 0644, 748 .proc_handler = proc_dou8vec_minmax, 749 .extra1 = SYSCTL_ZERO, 750 .extra2 = SYSCTL_THREE, 751 }, 752 { 753 .procname = "tcp_ecn_fallback", 754 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback, 755 .maxlen = sizeof(u8), 756 .mode = 0644, 757 .proc_handler = proc_dou8vec_minmax, 758 .extra1 = SYSCTL_ZERO, 759 .extra2 = SYSCTL_ONE, 760 }, 761 { 762 .procname = "ip_dynaddr", 763 .data = &init_net.ipv4.sysctl_ip_dynaddr, 764 .maxlen = sizeof(u8), 765 .mode = 0644, 766 .proc_handler = proc_dou8vec_minmax, 767 }, 768 { 769 .procname = "ip_early_demux", 770 .data = &init_net.ipv4.sysctl_ip_early_demux, 771 .maxlen = sizeof(u8), 772 .mode = 0644, 773 .proc_handler = proc_dou8vec_minmax, 774 }, 775 { 776 .procname = "udp_early_demux", 777 .data = &init_net.ipv4.sysctl_udp_early_demux, 778 .maxlen = sizeof(u8), 779 .mode = 0644, 780 .proc_handler = proc_dou8vec_minmax, 781 }, 782 { 783 .procname = "tcp_early_demux", 784 .data = &init_net.ipv4.sysctl_tcp_early_demux, 785 .maxlen = sizeof(u8), 786 .mode = 0644, 787 .proc_handler = proc_dou8vec_minmax, 788 }, 789 { 790 .procname = "nexthop_compat_mode", 791 .data = &init_net.ipv4.sysctl_nexthop_compat_mode, 792 .maxlen = sizeof(u8), 793 .mode = 0644, 794 .proc_handler = proc_dou8vec_minmax, 795 .extra1 = SYSCTL_ZERO, 796 .extra2 = SYSCTL_ONE, 797 }, 798 { 799 .procname = "ip_default_ttl", 800 .data = &init_net.ipv4.sysctl_ip_default_ttl, 801 .maxlen = sizeof(u8), 802 .mode = 0644, 803 .proc_handler = proc_dou8vec_minmax, 804 .extra1 = &ip_ttl_min, 805 .extra2 = &ip_ttl_max, 806 }, 807 { 808 .procname = "ip_local_port_range", 809 .maxlen = 0, 810 .data = &init_net, 811 .mode = 0644, 812 .proc_handler = ipv4_local_port_range, 813 }, 814 { 815 .procname = "ip_local_reserved_ports", 816 .data = &init_net.ipv4.sysctl_local_reserved_ports, 817 .maxlen = 65536, 818 .mode = 0644, 819 .proc_handler = proc_do_large_bitmap, 820 }, 821 { 822 .procname = "ip_no_pmtu_disc", 823 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc, 824 .maxlen = sizeof(u8), 825 .mode = 0644, 826 .proc_handler = proc_dou8vec_minmax, 827 }, 828 { 829 .procname = "ip_forward_use_pmtu", 830 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu, 831 .maxlen = sizeof(u8), 832 .mode = 0644, 833 .proc_handler = proc_dou8vec_minmax, 834 }, 835 { 836 .procname = "ip_forward_update_priority", 837 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority, 838 .maxlen = sizeof(u8), 839 .mode = 0644, 840 .proc_handler = ipv4_fwd_update_priority, 841 .extra1 = SYSCTL_ZERO, 842 .extra2 = SYSCTL_ONE, 843 }, 844 { 845 .procname = "ip_nonlocal_bind", 846 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind, 847 .maxlen = sizeof(u8), 848 .mode = 0644, 849 .proc_handler = proc_dou8vec_minmax, 850 }, 851 { 852 .procname = "ip_autobind_reuse", 853 .data = &init_net.ipv4.sysctl_ip_autobind_reuse, 854 .maxlen = sizeof(u8), 855 .mode = 0644, 856 .proc_handler = proc_dou8vec_minmax, 857 .extra1 = SYSCTL_ZERO, 858 .extra2 = SYSCTL_ONE, 859 }, 860 { 861 .procname = "fwmark_reflect", 862 .data = &init_net.ipv4.sysctl_fwmark_reflect, 863 .maxlen = sizeof(u8), 864 .mode = 0644, 865 .proc_handler = proc_dou8vec_minmax, 866 }, 867 { 868 .procname = "tcp_fwmark_accept", 869 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept, 870 .maxlen = sizeof(u8), 871 .mode = 0644, 872 .proc_handler = proc_dou8vec_minmax, 873 }, 874 #ifdef CONFIG_NET_L3_MASTER_DEV 875 { 876 .procname = "tcp_l3mdev_accept", 877 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept, 878 .maxlen = sizeof(u8), 879 .mode = 0644, 880 .proc_handler = proc_dou8vec_minmax, 881 .extra1 = SYSCTL_ZERO, 882 .extra2 = SYSCTL_ONE, 883 }, 884 #endif 885 { 886 .procname = "tcp_mtu_probing", 887 .data = &init_net.ipv4.sysctl_tcp_mtu_probing, 888 .maxlen = sizeof(u8), 889 .mode = 0644, 890 .proc_handler = proc_dou8vec_minmax, 891 }, 892 { 893 .procname = "tcp_base_mss", 894 .data = &init_net.ipv4.sysctl_tcp_base_mss, 895 .maxlen = sizeof(int), 896 .mode = 0644, 897 .proc_handler = proc_dointvec, 898 }, 899 { 900 .procname = "tcp_min_snd_mss", 901 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss, 902 .maxlen = sizeof(int), 903 .mode = 0644, 904 .proc_handler = proc_dointvec_minmax, 905 .extra1 = &tcp_min_snd_mss_min, 906 .extra2 = &tcp_min_snd_mss_max, 907 }, 908 { 909 .procname = "tcp_mtu_probe_floor", 910 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor, 911 .maxlen = sizeof(int), 912 .mode = 0644, 913 .proc_handler = proc_dointvec_minmax, 914 .extra1 = &tcp_min_snd_mss_min, 915 .extra2 = &tcp_min_snd_mss_max, 916 }, 917 { 918 .procname = "tcp_probe_threshold", 919 .data = &init_net.ipv4.sysctl_tcp_probe_threshold, 920 .maxlen = sizeof(int), 921 .mode = 0644, 922 .proc_handler = proc_dointvec, 923 }, 924 { 925 .procname = "tcp_probe_interval", 926 .data = &init_net.ipv4.sysctl_tcp_probe_interval, 927 .maxlen = sizeof(u32), 928 .mode = 0644, 929 .proc_handler = proc_douintvec_minmax, 930 .extra2 = &u32_max_div_HZ, 931 }, 932 { 933 .procname = "igmp_link_local_mcast_reports", 934 .data = &init_net.ipv4.sysctl_igmp_llm_reports, 935 .maxlen = sizeof(u8), 936 .mode = 0644, 937 .proc_handler = proc_dou8vec_minmax, 938 }, 939 { 940 .procname = "igmp_max_memberships", 941 .data = &init_net.ipv4.sysctl_igmp_max_memberships, 942 .maxlen = sizeof(int), 943 .mode = 0644, 944 .proc_handler = proc_dointvec 945 }, 946 { 947 .procname = "igmp_max_msf", 948 .data = &init_net.ipv4.sysctl_igmp_max_msf, 949 .maxlen = sizeof(int), 950 .mode = 0644, 951 .proc_handler = proc_dointvec 952 }, 953 #ifdef CONFIG_IP_MULTICAST 954 { 955 .procname = "igmp_qrv", 956 .data = &init_net.ipv4.sysctl_igmp_qrv, 957 .maxlen = sizeof(int), 958 .mode = 0644, 959 .proc_handler = proc_dointvec_minmax, 960 .extra1 = SYSCTL_ONE 961 }, 962 #endif 963 { 964 .procname = "tcp_congestion_control", 965 .data = &init_net.ipv4.tcp_congestion_control, 966 .mode = 0644, 967 .maxlen = TCP_CA_NAME_MAX, 968 .proc_handler = proc_tcp_congestion_control, 969 }, 970 { 971 .procname = "tcp_available_congestion_control", 972 .maxlen = TCP_CA_BUF_MAX, 973 .mode = 0444, 974 .proc_handler = proc_tcp_available_congestion_control, 975 }, 976 { 977 .procname = "tcp_allowed_congestion_control", 978 .maxlen = TCP_CA_BUF_MAX, 979 .mode = 0644, 980 .proc_handler = proc_allowed_congestion_control, 981 }, 982 { 983 .procname = "tcp_keepalive_time", 984 .data = &init_net.ipv4.sysctl_tcp_keepalive_time, 985 .maxlen = sizeof(int), 986 .mode = 0644, 987 .proc_handler = proc_dointvec_jiffies, 988 }, 989 { 990 .procname = "tcp_keepalive_probes", 991 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes, 992 .maxlen = sizeof(u8), 993 .mode = 0644, 994 .proc_handler = proc_dou8vec_minmax, 995 }, 996 { 997 .procname = "tcp_keepalive_intvl", 998 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl, 999 .maxlen = sizeof(int), 1000 .mode = 0644, 1001 .proc_handler = proc_dointvec_jiffies, 1002 }, 1003 { 1004 .procname = "tcp_syn_retries", 1005 .data = &init_net.ipv4.sysctl_tcp_syn_retries, 1006 .maxlen = sizeof(u8), 1007 .mode = 0644, 1008 .proc_handler = proc_dou8vec_minmax, 1009 .extra1 = &tcp_syn_retries_min, 1010 .extra2 = &tcp_syn_retries_max 1011 }, 1012 { 1013 .procname = "tcp_synack_retries", 1014 .data = &init_net.ipv4.sysctl_tcp_synack_retries, 1015 .maxlen = sizeof(u8), 1016 .mode = 0644, 1017 .proc_handler = proc_dou8vec_minmax, 1018 }, 1019 #ifdef CONFIG_SYN_COOKIES 1020 { 1021 .procname = "tcp_syncookies", 1022 .data = &init_net.ipv4.sysctl_tcp_syncookies, 1023 .maxlen = sizeof(u8), 1024 .mode = 0644, 1025 .proc_handler = proc_dou8vec_minmax, 1026 }, 1027 #endif 1028 { 1029 .procname = "tcp_migrate_req", 1030 .data = &init_net.ipv4.sysctl_tcp_migrate_req, 1031 .maxlen = sizeof(u8), 1032 .mode = 0644, 1033 .proc_handler = proc_dou8vec_minmax, 1034 .extra1 = SYSCTL_ZERO, 1035 .extra2 = SYSCTL_ONE 1036 }, 1037 { 1038 .procname = "tcp_reordering", 1039 .data = &init_net.ipv4.sysctl_tcp_reordering, 1040 .maxlen = sizeof(int), 1041 .mode = 0644, 1042 .proc_handler = proc_dointvec 1043 }, 1044 { 1045 .procname = "tcp_retries1", 1046 .data = &init_net.ipv4.sysctl_tcp_retries1, 1047 .maxlen = sizeof(u8), 1048 .mode = 0644, 1049 .proc_handler = proc_dou8vec_minmax, 1050 .extra2 = &tcp_retr1_max 1051 }, 1052 { 1053 .procname = "tcp_retries2", 1054 .data = &init_net.ipv4.sysctl_tcp_retries2, 1055 .maxlen = sizeof(u8), 1056 .mode = 0644, 1057 .proc_handler = proc_dou8vec_minmax, 1058 }, 1059 { 1060 .procname = "tcp_orphan_retries", 1061 .data = &init_net.ipv4.sysctl_tcp_orphan_retries, 1062 .maxlen = sizeof(u8), 1063 .mode = 0644, 1064 .proc_handler = proc_dou8vec_minmax, 1065 }, 1066 { 1067 .procname = "tcp_fin_timeout", 1068 .data = &init_net.ipv4.sysctl_tcp_fin_timeout, 1069 .maxlen = sizeof(int), 1070 .mode = 0644, 1071 .proc_handler = proc_dointvec_jiffies, 1072 }, 1073 { 1074 .procname = "tcp_notsent_lowat", 1075 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat, 1076 .maxlen = sizeof(unsigned int), 1077 .mode = 0644, 1078 .proc_handler = proc_douintvec, 1079 }, 1080 { 1081 .procname = "tcp_tw_reuse", 1082 .data = &init_net.ipv4.sysctl_tcp_tw_reuse, 1083 .maxlen = sizeof(u8), 1084 .mode = 0644, 1085 .proc_handler = proc_dou8vec_minmax, 1086 .extra1 = SYSCTL_ZERO, 1087 .extra2 = SYSCTL_TWO, 1088 }, 1089 { 1090 .procname = "tcp_tw_reuse_delay", 1091 .data = &init_net.ipv4.sysctl_tcp_tw_reuse_delay, 1092 .maxlen = sizeof(unsigned int), 1093 .mode = 0644, 1094 .proc_handler = proc_douintvec_minmax, 1095 .extra1 = SYSCTL_ONE, 1096 .extra2 = &tcp_tw_reuse_delay_max, 1097 }, 1098 { 1099 .procname = "tcp_max_syn_backlog", 1100 .data = &init_net.ipv4.sysctl_max_syn_backlog, 1101 .maxlen = sizeof(int), 1102 .mode = 0644, 1103 .proc_handler = proc_dointvec 1104 }, 1105 { 1106 .procname = "tcp_fastopen", 1107 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1108 .maxlen = sizeof(int), 1109 .mode = 0644, 1110 .proc_handler = proc_dointvec, 1111 }, 1112 { 1113 .procname = "tcp_fastopen_key", 1114 .mode = 0600, 1115 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1116 /* maxlen to print the list of keys in hex (*2), with dashes 1117 * separating doublewords and a comma in between keys. 1118 */ 1119 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 1120 2 * TCP_FASTOPEN_KEY_MAX) + 1121 (TCP_FASTOPEN_KEY_MAX * 5)), 1122 .proc_handler = proc_tcp_fastopen_key, 1123 }, 1124 { 1125 .procname = "tcp_fastopen_blackhole_timeout_sec", 1126 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout, 1127 .maxlen = sizeof(int), 1128 .mode = 0644, 1129 .proc_handler = proc_tfo_blackhole_detect_timeout, 1130 .extra1 = SYSCTL_ZERO, 1131 }, 1132 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1133 { 1134 .procname = "fib_multipath_use_neigh", 1135 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh, 1136 .maxlen = sizeof(u8), 1137 .mode = 0644, 1138 .proc_handler = proc_dou8vec_minmax, 1139 .extra1 = SYSCTL_ZERO, 1140 .extra2 = SYSCTL_ONE, 1141 }, 1142 { 1143 .procname = "fib_multipath_hash_policy", 1144 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy, 1145 .maxlen = sizeof(u8), 1146 .mode = 0644, 1147 .proc_handler = proc_fib_multipath_hash_policy, 1148 .extra1 = SYSCTL_ZERO, 1149 .extra2 = SYSCTL_THREE, 1150 }, 1151 { 1152 .procname = "fib_multipath_hash_fields", 1153 .data = &init_net.ipv4.sysctl_fib_multipath_hash_fields, 1154 .maxlen = sizeof(u32), 1155 .mode = 0644, 1156 .proc_handler = proc_fib_multipath_hash_fields, 1157 .extra1 = SYSCTL_ONE, 1158 .extra2 = &fib_multipath_hash_fields_all_mask, 1159 }, 1160 { 1161 .procname = "fib_multipath_hash_seed", 1162 .data = &init_net, 1163 .maxlen = sizeof(u32), 1164 .mode = 0644, 1165 .proc_handler = proc_fib_multipath_hash_seed, 1166 }, 1167 #endif 1168 { 1169 .procname = "ip_unprivileged_port_start", 1170 .maxlen = sizeof(int), 1171 .data = &init_net.ipv4.sysctl_ip_prot_sock, 1172 .mode = 0644, 1173 .proc_handler = ipv4_privileged_ports, 1174 }, 1175 #ifdef CONFIG_NET_L3_MASTER_DEV 1176 { 1177 .procname = "udp_l3mdev_accept", 1178 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept, 1179 .maxlen = sizeof(u8), 1180 .mode = 0644, 1181 .proc_handler = proc_dou8vec_minmax, 1182 .extra1 = SYSCTL_ZERO, 1183 .extra2 = SYSCTL_ONE, 1184 }, 1185 #endif 1186 { 1187 .procname = "tcp_sack", 1188 .data = &init_net.ipv4.sysctl_tcp_sack, 1189 .maxlen = sizeof(u8), 1190 .mode = 0644, 1191 .proc_handler = proc_dou8vec_minmax, 1192 }, 1193 { 1194 .procname = "tcp_window_scaling", 1195 .data = &init_net.ipv4.sysctl_tcp_window_scaling, 1196 .maxlen = sizeof(u8), 1197 .mode = 0644, 1198 .proc_handler = proc_dou8vec_minmax, 1199 }, 1200 { 1201 .procname = "tcp_timestamps", 1202 .data = &init_net.ipv4.sysctl_tcp_timestamps, 1203 .maxlen = sizeof(u8), 1204 .mode = 0644, 1205 .proc_handler = proc_dou8vec_minmax, 1206 }, 1207 { 1208 .procname = "tcp_early_retrans", 1209 .data = &init_net.ipv4.sysctl_tcp_early_retrans, 1210 .maxlen = sizeof(u8), 1211 .mode = 0644, 1212 .proc_handler = proc_dou8vec_minmax, 1213 .extra1 = SYSCTL_ZERO, 1214 .extra2 = SYSCTL_FOUR, 1215 }, 1216 { 1217 .procname = "tcp_recovery", 1218 .data = &init_net.ipv4.sysctl_tcp_recovery, 1219 .maxlen = sizeof(u8), 1220 .mode = 0644, 1221 .proc_handler = proc_dou8vec_minmax, 1222 }, 1223 { 1224 .procname = "tcp_thin_linear_timeouts", 1225 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts, 1226 .maxlen = sizeof(u8), 1227 .mode = 0644, 1228 .proc_handler = proc_dou8vec_minmax, 1229 }, 1230 { 1231 .procname = "tcp_slow_start_after_idle", 1232 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle, 1233 .maxlen = sizeof(u8), 1234 .mode = 0644, 1235 .proc_handler = proc_dou8vec_minmax, 1236 }, 1237 { 1238 .procname = "tcp_retrans_collapse", 1239 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse, 1240 .maxlen = sizeof(u8), 1241 .mode = 0644, 1242 .proc_handler = proc_dou8vec_minmax, 1243 }, 1244 { 1245 .procname = "tcp_stdurg", 1246 .data = &init_net.ipv4.sysctl_tcp_stdurg, 1247 .maxlen = sizeof(u8), 1248 .mode = 0644, 1249 .proc_handler = proc_dou8vec_minmax, 1250 }, 1251 { 1252 .procname = "tcp_rfc1337", 1253 .data = &init_net.ipv4.sysctl_tcp_rfc1337, 1254 .maxlen = sizeof(u8), 1255 .mode = 0644, 1256 .proc_handler = proc_dou8vec_minmax, 1257 }, 1258 { 1259 .procname = "tcp_abort_on_overflow", 1260 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow, 1261 .maxlen = sizeof(u8), 1262 .mode = 0644, 1263 .proc_handler = proc_dou8vec_minmax, 1264 }, 1265 { 1266 .procname = "tcp_fack", 1267 .data = &init_net.ipv4.sysctl_tcp_fack, 1268 .maxlen = sizeof(u8), 1269 .mode = 0644, 1270 .proc_handler = proc_dou8vec_minmax, 1271 }, 1272 { 1273 .procname = "tcp_max_reordering", 1274 .data = &init_net.ipv4.sysctl_tcp_max_reordering, 1275 .maxlen = sizeof(int), 1276 .mode = 0644, 1277 .proc_handler = proc_dointvec 1278 }, 1279 { 1280 .procname = "tcp_dsack", 1281 .data = &init_net.ipv4.sysctl_tcp_dsack, 1282 .maxlen = sizeof(u8), 1283 .mode = 0644, 1284 .proc_handler = proc_dou8vec_minmax, 1285 }, 1286 { 1287 .procname = "tcp_app_win", 1288 .data = &init_net.ipv4.sysctl_tcp_app_win, 1289 .maxlen = sizeof(u8), 1290 .mode = 0644, 1291 .proc_handler = proc_dou8vec_minmax, 1292 .extra1 = SYSCTL_ZERO, 1293 .extra2 = &tcp_app_win_max, 1294 }, 1295 { 1296 .procname = "tcp_adv_win_scale", 1297 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale, 1298 .maxlen = sizeof(int), 1299 .mode = 0644, 1300 .proc_handler = proc_dointvec_minmax, 1301 .extra1 = &tcp_adv_win_scale_min, 1302 .extra2 = &tcp_adv_win_scale_max, 1303 }, 1304 { 1305 .procname = "tcp_frto", 1306 .data = &init_net.ipv4.sysctl_tcp_frto, 1307 .maxlen = sizeof(u8), 1308 .mode = 0644, 1309 .proc_handler = proc_dou8vec_minmax, 1310 }, 1311 { 1312 .procname = "tcp_no_metrics_save", 1313 .data = &init_net.ipv4.sysctl_tcp_nometrics_save, 1314 .maxlen = sizeof(u8), 1315 .mode = 0644, 1316 .proc_handler = proc_dou8vec_minmax, 1317 }, 1318 { 1319 .procname = "tcp_no_ssthresh_metrics_save", 1320 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save, 1321 .maxlen = sizeof(u8), 1322 .mode = 0644, 1323 .proc_handler = proc_dou8vec_minmax, 1324 .extra1 = SYSCTL_ZERO, 1325 .extra2 = SYSCTL_ONE, 1326 }, 1327 { 1328 .procname = "tcp_moderate_rcvbuf", 1329 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf, 1330 .maxlen = sizeof(u8), 1331 .mode = 0644, 1332 .proc_handler = proc_dou8vec_minmax, 1333 }, 1334 { 1335 .procname = "tcp_tso_win_divisor", 1336 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor, 1337 .maxlen = sizeof(u8), 1338 .mode = 0644, 1339 .proc_handler = proc_dou8vec_minmax, 1340 }, 1341 { 1342 .procname = "tcp_workaround_signed_windows", 1343 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows, 1344 .maxlen = sizeof(u8), 1345 .mode = 0644, 1346 .proc_handler = proc_dou8vec_minmax, 1347 }, 1348 { 1349 .procname = "tcp_limit_output_bytes", 1350 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes, 1351 .maxlen = sizeof(int), 1352 .mode = 0644, 1353 .proc_handler = proc_dointvec 1354 }, 1355 { 1356 .procname = "tcp_challenge_ack_limit", 1357 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit, 1358 .maxlen = sizeof(int), 1359 .mode = 0644, 1360 .proc_handler = proc_dointvec 1361 }, 1362 { 1363 .procname = "tcp_min_tso_segs", 1364 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs, 1365 .maxlen = sizeof(u8), 1366 .mode = 0644, 1367 .proc_handler = proc_dou8vec_minmax, 1368 .extra1 = SYSCTL_ONE, 1369 }, 1370 { 1371 .procname = "tcp_tso_rtt_log", 1372 .data = &init_net.ipv4.sysctl_tcp_tso_rtt_log, 1373 .maxlen = sizeof(u8), 1374 .mode = 0644, 1375 .proc_handler = proc_dou8vec_minmax, 1376 }, 1377 { 1378 .procname = "tcp_min_rtt_wlen", 1379 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen, 1380 .maxlen = sizeof(int), 1381 .mode = 0644, 1382 .proc_handler = proc_dointvec_minmax, 1383 .extra1 = SYSCTL_ZERO, 1384 .extra2 = &one_day_secs 1385 }, 1386 { 1387 .procname = "tcp_autocorking", 1388 .data = &init_net.ipv4.sysctl_tcp_autocorking, 1389 .maxlen = sizeof(u8), 1390 .mode = 0644, 1391 .proc_handler = proc_dou8vec_minmax, 1392 .extra1 = SYSCTL_ZERO, 1393 .extra2 = SYSCTL_ONE, 1394 }, 1395 { 1396 .procname = "tcp_invalid_ratelimit", 1397 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit, 1398 .maxlen = sizeof(int), 1399 .mode = 0644, 1400 .proc_handler = proc_dointvec_ms_jiffies, 1401 }, 1402 { 1403 .procname = "tcp_pacing_ss_ratio", 1404 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio, 1405 .maxlen = sizeof(int), 1406 .mode = 0644, 1407 .proc_handler = proc_dointvec_minmax, 1408 .extra1 = SYSCTL_ZERO, 1409 .extra2 = SYSCTL_ONE_THOUSAND, 1410 }, 1411 { 1412 .procname = "tcp_pacing_ca_ratio", 1413 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio, 1414 .maxlen = sizeof(int), 1415 .mode = 0644, 1416 .proc_handler = proc_dointvec_minmax, 1417 .extra1 = SYSCTL_ZERO, 1418 .extra2 = SYSCTL_ONE_THOUSAND, 1419 }, 1420 { 1421 .procname = "tcp_wmem", 1422 .data = &init_net.ipv4.sysctl_tcp_wmem, 1423 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem), 1424 .mode = 0644, 1425 .proc_handler = proc_dointvec_minmax, 1426 .extra1 = SYSCTL_ONE, 1427 }, 1428 { 1429 .procname = "tcp_rmem", 1430 .data = &init_net.ipv4.sysctl_tcp_rmem, 1431 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem), 1432 .mode = 0644, 1433 .proc_handler = proc_dointvec_minmax, 1434 .extra1 = SYSCTL_ONE, 1435 }, 1436 { 1437 .procname = "tcp_comp_sack_delay_ns", 1438 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns, 1439 .maxlen = sizeof(unsigned long), 1440 .mode = 0644, 1441 .proc_handler = proc_doulongvec_minmax, 1442 }, 1443 { 1444 .procname = "tcp_comp_sack_slack_ns", 1445 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns, 1446 .maxlen = sizeof(unsigned long), 1447 .mode = 0644, 1448 .proc_handler = proc_doulongvec_minmax, 1449 }, 1450 { 1451 .procname = "tcp_comp_sack_nr", 1452 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr, 1453 .maxlen = sizeof(u8), 1454 .mode = 0644, 1455 .proc_handler = proc_dou8vec_minmax, 1456 .extra1 = SYSCTL_ZERO, 1457 }, 1458 { 1459 .procname = "tcp_backlog_ack_defer", 1460 .data = &init_net.ipv4.sysctl_tcp_backlog_ack_defer, 1461 .maxlen = sizeof(u8), 1462 .mode = 0644, 1463 .proc_handler = proc_dou8vec_minmax, 1464 .extra1 = SYSCTL_ZERO, 1465 .extra2 = SYSCTL_ONE, 1466 }, 1467 { 1468 .procname = "tcp_reflect_tos", 1469 .data = &init_net.ipv4.sysctl_tcp_reflect_tos, 1470 .maxlen = sizeof(u8), 1471 .mode = 0644, 1472 .proc_handler = proc_dou8vec_minmax, 1473 .extra1 = SYSCTL_ZERO, 1474 .extra2 = SYSCTL_ONE, 1475 }, 1476 { 1477 .procname = "tcp_ehash_entries", 1478 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries, 1479 .mode = 0444, 1480 .proc_handler = proc_tcp_ehash_entries, 1481 }, 1482 { 1483 .procname = "tcp_child_ehash_entries", 1484 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries, 1485 .maxlen = sizeof(unsigned int), 1486 .mode = 0644, 1487 .proc_handler = proc_douintvec_minmax, 1488 .extra1 = SYSCTL_ZERO, 1489 .extra2 = &tcp_child_ehash_entries_max, 1490 }, 1491 { 1492 .procname = "udp_hash_entries", 1493 .data = &init_net.ipv4.sysctl_udp_child_hash_entries, 1494 .mode = 0444, 1495 .proc_handler = proc_udp_hash_entries, 1496 }, 1497 { 1498 .procname = "udp_child_hash_entries", 1499 .data = &init_net.ipv4.sysctl_udp_child_hash_entries, 1500 .maxlen = sizeof(unsigned int), 1501 .mode = 0644, 1502 .proc_handler = proc_douintvec_minmax, 1503 .extra1 = SYSCTL_ZERO, 1504 .extra2 = &udp_child_hash_entries_max, 1505 }, 1506 { 1507 .procname = "udp_rmem_min", 1508 .data = &init_net.ipv4.sysctl_udp_rmem_min, 1509 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min), 1510 .mode = 0644, 1511 .proc_handler = proc_dointvec_minmax, 1512 .extra1 = SYSCTL_ONE 1513 }, 1514 { 1515 .procname = "udp_wmem_min", 1516 .data = &init_net.ipv4.sysctl_udp_wmem_min, 1517 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min), 1518 .mode = 0644, 1519 .proc_handler = proc_dointvec_minmax, 1520 .extra1 = SYSCTL_ONE 1521 }, 1522 { 1523 .procname = "fib_notify_on_flag_change", 1524 .data = &init_net.ipv4.sysctl_fib_notify_on_flag_change, 1525 .maxlen = sizeof(u8), 1526 .mode = 0644, 1527 .proc_handler = proc_dou8vec_minmax, 1528 .extra1 = SYSCTL_ZERO, 1529 .extra2 = SYSCTL_TWO, 1530 }, 1531 { 1532 .procname = "tcp_plb_enabled", 1533 .data = &init_net.ipv4.sysctl_tcp_plb_enabled, 1534 .maxlen = sizeof(u8), 1535 .mode = 0644, 1536 .proc_handler = proc_dou8vec_minmax, 1537 .extra1 = SYSCTL_ZERO, 1538 .extra2 = SYSCTL_ONE, 1539 }, 1540 { 1541 .procname = "tcp_plb_idle_rehash_rounds", 1542 .data = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds, 1543 .maxlen = sizeof(u8), 1544 .mode = 0644, 1545 .proc_handler = proc_dou8vec_minmax, 1546 .extra2 = &tcp_plb_max_rounds, 1547 }, 1548 { 1549 .procname = "tcp_plb_rehash_rounds", 1550 .data = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds, 1551 .maxlen = sizeof(u8), 1552 .mode = 0644, 1553 .proc_handler = proc_dou8vec_minmax, 1554 .extra2 = &tcp_plb_max_rounds, 1555 }, 1556 { 1557 .procname = "tcp_plb_suspend_rto_sec", 1558 .data = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec, 1559 .maxlen = sizeof(u8), 1560 .mode = 0644, 1561 .proc_handler = proc_dou8vec_minmax, 1562 }, 1563 { 1564 .procname = "tcp_plb_cong_thresh", 1565 .data = &init_net.ipv4.sysctl_tcp_plb_cong_thresh, 1566 .maxlen = sizeof(int), 1567 .mode = 0644, 1568 .proc_handler = proc_dointvec_minmax, 1569 .extra1 = SYSCTL_ZERO, 1570 .extra2 = &tcp_plb_max_cong_thresh, 1571 }, 1572 { 1573 .procname = "tcp_syn_linear_timeouts", 1574 .data = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts, 1575 .maxlen = sizeof(u8), 1576 .mode = 0644, 1577 .proc_handler = proc_dou8vec_minmax, 1578 .extra1 = SYSCTL_ZERO, 1579 .extra2 = &tcp_syn_linear_timeouts_max, 1580 }, 1581 { 1582 .procname = "tcp_shrink_window", 1583 .data = &init_net.ipv4.sysctl_tcp_shrink_window, 1584 .maxlen = sizeof(u8), 1585 .mode = 0644, 1586 .proc_handler = proc_dou8vec_minmax, 1587 .extra1 = SYSCTL_ZERO, 1588 .extra2 = SYSCTL_ONE, 1589 }, 1590 { 1591 .procname = "tcp_pingpong_thresh", 1592 .data = &init_net.ipv4.sysctl_tcp_pingpong_thresh, 1593 .maxlen = sizeof(u8), 1594 .mode = 0644, 1595 .proc_handler = proc_dou8vec_minmax, 1596 .extra1 = SYSCTL_ONE, 1597 }, 1598 { 1599 .procname = "tcp_rto_min_us", 1600 .data = &init_net.ipv4.sysctl_tcp_rto_min_us, 1601 .maxlen = sizeof(int), 1602 .mode = 0644, 1603 .proc_handler = proc_dointvec_minmax, 1604 .extra1 = SYSCTL_ONE, 1605 }, 1606 { 1607 .procname = "tcp_rto_max_ms", 1608 .data = &init_net.ipv4.sysctl_tcp_rto_max_ms, 1609 .maxlen = sizeof(int), 1610 .mode = 0644, 1611 .proc_handler = proc_dointvec_minmax, 1612 .extra1 = SYSCTL_ONE_THOUSAND, 1613 .extra2 = &tcp_rto_max_max, 1614 }, 1615 }; 1616 1617 static __net_init int ipv4_sysctl_init_net(struct net *net) 1618 { 1619 size_t table_size = ARRAY_SIZE(ipv4_net_table); 1620 struct ctl_table *table; 1621 1622 table = ipv4_net_table; 1623 if (!net_eq(net, &init_net)) { 1624 int i; 1625 1626 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); 1627 if (!table) 1628 goto err_alloc; 1629 1630 for (i = 0; i < table_size; i++) { 1631 if (table[i].data) { 1632 /* Update the variables to point into 1633 * the current struct net 1634 */ 1635 table[i].data += (void *)net - (void *)&init_net; 1636 } else { 1637 /* Entries without data pointer are global; 1638 * Make them read-only in non-init_net ns 1639 */ 1640 table[i].mode &= ~0222; 1641 } 1642 } 1643 } 1644 1645 net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table, 1646 table_size); 1647 if (!net->ipv4.ipv4_hdr) 1648 goto err_reg; 1649 1650 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1651 if (!net->ipv4.sysctl_local_reserved_ports) 1652 goto err_ports; 1653 1654 proc_fib_multipath_hash_set_seed(net, 0); 1655 1656 return 0; 1657 1658 err_ports: 1659 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1660 err_reg: 1661 if (!net_eq(net, &init_net)) 1662 kfree(table); 1663 err_alloc: 1664 return -ENOMEM; 1665 } 1666 1667 static __net_exit void ipv4_sysctl_exit_net(struct net *net) 1668 { 1669 const struct ctl_table *table; 1670 1671 kfree(net->ipv4.sysctl_local_reserved_ports); 1672 table = net->ipv4.ipv4_hdr->ctl_table_arg; 1673 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1674 kfree(table); 1675 } 1676 1677 static __net_initdata struct pernet_operations ipv4_sysctl_ops = { 1678 .init = ipv4_sysctl_init_net, 1679 .exit = ipv4_sysctl_exit_net, 1680 }; 1681 1682 static __init int sysctl_ipv4_init(void) 1683 { 1684 struct ctl_table_header *hdr; 1685 1686 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table); 1687 if (!hdr) 1688 return -ENOMEM; 1689 1690 proc_fib_multipath_hash_init_rand_seed(); 1691 1692 if (register_pernet_subsys(&ipv4_sysctl_ops)) { 1693 unregister_net_sysctl_table(hdr); 1694 return -ENOMEM; 1695 } 1696 1697 return 0; 1698 } 1699 1700 __initcall(sysctl_ipv4_init); 1701