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 51 /* obsolete */ 52 static int sysctl_tcp_low_latency __read_mostly; 53 54 /* Update system visible IP port range */ 55 static void set_local_port_range(struct net *net, unsigned int low, unsigned int high) 56 { 57 bool same_parity = !((low ^ high) & 1); 58 59 if (same_parity && !net->ipv4.ip_local_ports.warned) { 60 net->ipv4.ip_local_ports.warned = true; 61 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n"); 62 } 63 WRITE_ONCE(net->ipv4.ip_local_ports.range, high << 16 | low); 64 } 65 66 /* Validate changes from /proc interface. */ 67 static int ipv4_local_port_range(const struct ctl_table *table, int write, 68 void *buffer, size_t *lenp, loff_t *ppos) 69 { 70 struct net *net = table->data; 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] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock))) 92 ret = -EINVAL; 93 else 94 set_local_port_range(net, range[0], range[1]); 95 } 96 97 return ret; 98 } 99 100 /* Validate changes from /proc interface. */ 101 static int ipv4_privileged_ports(const 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 = READ_ONCE(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 WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports); 130 } 131 132 return ret; 133 } 134 135 static void inet_get_ping_group_range_table(const struct ctl_table *table, 136 kgid_t *low, kgid_t *high) 137 { 138 kgid_t *data = table->data; 139 struct net *net = 140 container_of(table->data, struct net, ipv4.ping_group_range.range); 141 unsigned int seq; 142 do { 143 seq = read_seqbegin(&net->ipv4.ping_group_range.lock); 144 145 *low = data[0]; 146 *high = data[1]; 147 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); 148 } 149 150 /* Update system visible IP port range */ 151 static void set_ping_group_range(const struct ctl_table *table, 152 kgid_t low, kgid_t high) 153 { 154 kgid_t *data = table->data; 155 struct net *net = 156 container_of(table->data, struct net, ipv4.ping_group_range.range); 157 write_seqlock(&net->ipv4.ping_group_range.lock); 158 data[0] = low; 159 data[1] = high; 160 write_sequnlock(&net->ipv4.ping_group_range.lock); 161 } 162 163 /* Validate changes from /proc interface. */ 164 static int ipv4_ping_group_range(const struct ctl_table *table, int write, 165 void *buffer, size_t *lenp, loff_t *ppos) 166 { 167 struct user_namespace *user_ns = current_user_ns(); 168 int ret; 169 unsigned long urange[2]; 170 kgid_t low, high; 171 struct ctl_table tmp = { 172 .data = &urange, 173 .maxlen = sizeof(urange), 174 .mode = table->mode, 175 .extra1 = &ip_ping_group_range_min, 176 .extra2 = &ip_ping_group_range_max, 177 }; 178 179 inet_get_ping_group_range_table(table, &low, &high); 180 urange[0] = from_kgid_munged(user_ns, low); 181 urange[1] = from_kgid_munged(user_ns, high); 182 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos); 183 184 if (write && ret == 0) { 185 low = make_kgid(user_ns, urange[0]); 186 high = make_kgid(user_ns, urange[1]); 187 if (!gid_valid(low) || !gid_valid(high)) 188 return -EINVAL; 189 if (urange[1] < urange[0] || gid_lt(high, low)) { 190 low = make_kgid(&init_user_ns, 1); 191 high = make_kgid(&init_user_ns, 0); 192 } 193 set_ping_group_range(table, low, high); 194 } 195 196 return ret; 197 } 198 199 static int ipv4_fwd_update_priority(const struct ctl_table *table, int write, 200 void *buffer, size_t *lenp, loff_t *ppos) 201 { 202 struct net *net; 203 int ret; 204 205 net = container_of(table->data, struct net, 206 ipv4.sysctl_ip_fwd_update_priority); 207 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 208 if (write && ret == 0) 209 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE, 210 net); 211 212 return ret; 213 } 214 215 static int proc_tcp_congestion_control(const struct ctl_table *ctl, int write, 216 void *buffer, size_t *lenp, loff_t *ppos) 217 { 218 struct net *net = container_of(ctl->data, struct net, 219 ipv4.tcp_congestion_control); 220 char val[TCP_CA_NAME_MAX]; 221 struct ctl_table tbl = { 222 .data = val, 223 .maxlen = TCP_CA_NAME_MAX, 224 }; 225 int ret; 226 227 tcp_get_default_congestion_control(net, val); 228 229 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 230 if (write && ret == 0) 231 ret = tcp_set_default_congestion_control(net, val); 232 return ret; 233 } 234 235 static int proc_tcp_available_congestion_control(const struct ctl_table *ctl, 236 int write, void *buffer, 237 size_t *lenp, loff_t *ppos) 238 { 239 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, }; 240 int ret; 241 242 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 243 if (!tbl.data) 244 return -ENOMEM; 245 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX); 246 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 247 kfree(tbl.data); 248 return ret; 249 } 250 251 static int proc_allowed_congestion_control(const struct ctl_table *ctl, 252 int write, void *buffer, 253 size_t *lenp, loff_t *ppos) 254 { 255 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX }; 256 int ret; 257 258 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 259 if (!tbl.data) 260 return -ENOMEM; 261 262 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen); 263 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 264 if (write && ret == 0) 265 ret = tcp_set_allowed_congestion_control(tbl.data); 266 kfree(tbl.data); 267 return ret; 268 } 269 270 static int sscanf_key(char *buf, __le32 *key) 271 { 272 u32 user_key[4]; 273 int i, ret = 0; 274 275 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1, 276 user_key + 2, user_key + 3) != 4) { 277 ret = -EINVAL; 278 } else { 279 for (i = 0; i < ARRAY_SIZE(user_key); i++) 280 key[i] = cpu_to_le32(user_key[i]); 281 } 282 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n", 283 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret); 284 285 return ret; 286 } 287 288 static int proc_tcp_fastopen_key(const struct ctl_table *table, int write, 289 void *buffer, size_t *lenp, loff_t *ppos) 290 { 291 struct net *net = container_of(table->data, struct net, 292 ipv4.sysctl_tcp_fastopen); 293 /* maxlen to print the list of keys in hex (*2), with dashes 294 * separating doublewords and a comma in between keys. 295 */ 296 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 297 2 * TCP_FASTOPEN_KEY_MAX) + 298 (TCP_FASTOPEN_KEY_MAX * 5)) }; 299 u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)]; 300 __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)]; 301 char *backup_data; 302 int ret, i = 0, off = 0, n_keys; 303 304 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL); 305 if (!tbl.data) 306 return -ENOMEM; 307 308 n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key); 309 if (!n_keys) { 310 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH); 311 n_keys = 1; 312 } 313 314 for (i = 0; i < n_keys * 4; i++) 315 user_key[i] = le32_to_cpu(key[i]); 316 317 for (i = 0; i < n_keys; i++) { 318 off += snprintf(tbl.data + off, tbl.maxlen - off, 319 "%08x-%08x-%08x-%08x", 320 user_key[i * 4], 321 user_key[i * 4 + 1], 322 user_key[i * 4 + 2], 323 user_key[i * 4 + 3]); 324 325 if (WARN_ON_ONCE(off >= tbl.maxlen - 1)) 326 break; 327 328 if (i + 1 < n_keys) 329 off += snprintf(tbl.data + off, tbl.maxlen - off, ","); 330 } 331 332 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 333 334 if (write && ret == 0) { 335 backup_data = strchr(tbl.data, ','); 336 if (backup_data) { 337 *backup_data = '\0'; 338 backup_data++; 339 } 340 if (sscanf_key(tbl.data, key)) { 341 ret = -EINVAL; 342 goto bad_key; 343 } 344 if (backup_data) { 345 if (sscanf_key(backup_data, key + 4)) { 346 ret = -EINVAL; 347 goto bad_key; 348 } 349 } 350 tcp_fastopen_reset_cipher(net, NULL, key, 351 backup_data ? key + 4 : NULL); 352 } 353 354 bad_key: 355 kfree(tbl.data); 356 return ret; 357 } 358 359 static int proc_tfo_blackhole_detect_timeout(const struct ctl_table *table, 360 int write, void *buffer, 361 size_t *lenp, loff_t *ppos) 362 { 363 struct net *net = container_of(table->data, struct net, 364 ipv4.sysctl_tcp_fastopen_blackhole_timeout); 365 int ret; 366 367 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 368 if (write && ret == 0) 369 atomic_set(&net->ipv4.tfo_active_disable_times, 0); 370 371 return ret; 372 } 373 374 static int proc_tcp_available_ulp(const struct ctl_table *ctl, 375 int write, void *buffer, size_t *lenp, 376 loff_t *ppos) 377 { 378 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, }; 379 int ret; 380 381 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 382 if (!tbl.data) 383 return -ENOMEM; 384 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX); 385 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 386 kfree(tbl.data); 387 388 return ret; 389 } 390 391 static int proc_tcp_ehash_entries(const struct ctl_table *table, int write, 392 void *buffer, size_t *lenp, loff_t *ppos) 393 { 394 struct net *net = container_of(table->data, struct net, 395 ipv4.sysctl_tcp_child_ehash_entries); 396 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo; 397 int tcp_ehash_entries; 398 struct ctl_table tbl; 399 400 tcp_ehash_entries = hinfo->ehash_mask + 1; 401 402 /* A negative number indicates that the child netns 403 * shares the global ehash. 404 */ 405 if (!net_eq(net, &init_net) && !hinfo->pernet) 406 tcp_ehash_entries *= -1; 407 408 memset(&tbl, 0, sizeof(tbl)); 409 tbl.data = &tcp_ehash_entries; 410 tbl.maxlen = sizeof(int); 411 412 return proc_dointvec(&tbl, write, buffer, lenp, ppos); 413 } 414 415 static int proc_udp_hash_entries(const struct ctl_table *table, int write, 416 void *buffer, size_t *lenp, loff_t *ppos) 417 { 418 struct net *net = container_of(table->data, struct net, 419 ipv4.sysctl_udp_child_hash_entries); 420 int udp_hash_entries; 421 struct ctl_table tbl; 422 423 udp_hash_entries = net->ipv4.udp_table->mask + 1; 424 425 /* A negative number indicates that the child netns 426 * shares the global udp_table. 427 */ 428 if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table) 429 udp_hash_entries *= -1; 430 431 memset(&tbl, 0, sizeof(tbl)); 432 tbl.data = &udp_hash_entries; 433 tbl.maxlen = sizeof(int); 434 435 return proc_dointvec(&tbl, write, buffer, lenp, ppos); 436 } 437 438 #ifdef CONFIG_IP_ROUTE_MULTIPATH 439 static int proc_fib_multipath_hash_policy(const struct ctl_table *table, int write, 440 void *buffer, size_t *lenp, 441 loff_t *ppos) 442 { 443 struct net *net = container_of(table->data, struct net, 444 ipv4.sysctl_fib_multipath_hash_policy); 445 int ret; 446 447 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 448 if (write && ret == 0) 449 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 450 451 return ret; 452 } 453 454 static int proc_fib_multipath_hash_fields(const struct ctl_table *table, int write, 455 void *buffer, size_t *lenp, 456 loff_t *ppos) 457 { 458 struct net *net; 459 int ret; 460 461 net = container_of(table->data, struct net, 462 ipv4.sysctl_fib_multipath_hash_fields); 463 ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos); 464 if (write && ret == 0) 465 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 466 467 return ret; 468 } 469 470 static u32 proc_fib_multipath_hash_rand_seed __ro_after_init; 471 472 static void proc_fib_multipath_hash_init_rand_seed(void) 473 { 474 get_random_bytes(&proc_fib_multipath_hash_rand_seed, 475 sizeof(proc_fib_multipath_hash_rand_seed)); 476 } 477 478 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed) 479 { 480 struct sysctl_fib_multipath_hash_seed new = { 481 .user_seed = user_seed, 482 .mp_seed = (user_seed ? user_seed : 483 proc_fib_multipath_hash_rand_seed), 484 }; 485 486 WRITE_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed, new); 487 } 488 489 static int proc_fib_multipath_hash_seed(const struct ctl_table *table, int write, 490 void *buffer, size_t *lenp, 491 loff_t *ppos) 492 { 493 struct sysctl_fib_multipath_hash_seed *mphs; 494 struct net *net = table->data; 495 struct ctl_table tmp; 496 u32 user_seed; 497 int ret; 498 499 mphs = &net->ipv4.sysctl_fib_multipath_hash_seed; 500 user_seed = mphs->user_seed; 501 502 tmp = *table; 503 tmp.data = &user_seed; 504 505 ret = proc_douintvec_minmax(&tmp, write, buffer, lenp, ppos); 506 507 if (write && ret == 0) { 508 proc_fib_multipath_hash_set_seed(net, user_seed); 509 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 510 } 511 512 return ret; 513 } 514 #else 515 516 static void proc_fib_multipath_hash_init_rand_seed(void) 517 { 518 } 519 520 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed) 521 { 522 } 523 524 #endif 525 526 static struct ctl_table ipv4_table[] = { 527 { 528 .procname = "tcp_max_orphans", 529 .data = &sysctl_tcp_max_orphans, 530 .maxlen = sizeof(int), 531 .mode = 0644, 532 .proc_handler = proc_dointvec 533 }, 534 { 535 .procname = "inet_peer_threshold", 536 .data = &inet_peer_threshold, 537 .maxlen = sizeof(int), 538 .mode = 0644, 539 .proc_handler = proc_dointvec 540 }, 541 { 542 .procname = "inet_peer_minttl", 543 .data = &inet_peer_minttl, 544 .maxlen = sizeof(int), 545 .mode = 0644, 546 .proc_handler = proc_dointvec_jiffies, 547 }, 548 { 549 .procname = "inet_peer_maxttl", 550 .data = &inet_peer_maxttl, 551 .maxlen = sizeof(int), 552 .mode = 0644, 553 .proc_handler = proc_dointvec_jiffies, 554 }, 555 { 556 .procname = "tcp_mem", 557 .maxlen = sizeof(sysctl_tcp_mem), 558 .data = &sysctl_tcp_mem, 559 .mode = 0644, 560 .proc_handler = proc_doulongvec_minmax, 561 }, 562 { 563 .procname = "tcp_low_latency", 564 .data = &sysctl_tcp_low_latency, 565 .maxlen = sizeof(int), 566 .mode = 0644, 567 .proc_handler = proc_dointvec 568 }, 569 #ifdef CONFIG_NETLABEL 570 { 571 .procname = "cipso_cache_enable", 572 .data = &cipso_v4_cache_enabled, 573 .maxlen = sizeof(int), 574 .mode = 0644, 575 .proc_handler = proc_dointvec, 576 }, 577 { 578 .procname = "cipso_cache_bucket_size", 579 .data = &cipso_v4_cache_bucketsize, 580 .maxlen = sizeof(int), 581 .mode = 0644, 582 .proc_handler = proc_dointvec, 583 }, 584 { 585 .procname = "cipso_rbm_optfmt", 586 .data = &cipso_v4_rbm_optfmt, 587 .maxlen = sizeof(int), 588 .mode = 0644, 589 .proc_handler = proc_dointvec, 590 }, 591 { 592 .procname = "cipso_rbm_strictvalid", 593 .data = &cipso_v4_rbm_strictvalid, 594 .maxlen = sizeof(int), 595 .mode = 0644, 596 .proc_handler = proc_dointvec, 597 }, 598 #endif /* CONFIG_NETLABEL */ 599 { 600 .procname = "tcp_available_ulp", 601 .maxlen = TCP_ULP_BUF_MAX, 602 .mode = 0444, 603 .proc_handler = proc_tcp_available_ulp, 604 }, 605 { 606 .procname = "udp_mem", 607 .data = &sysctl_udp_mem, 608 .maxlen = sizeof(sysctl_udp_mem), 609 .mode = 0644, 610 .proc_handler = proc_doulongvec_minmax, 611 }, 612 { 613 .procname = "fib_sync_mem", 614 .data = &sysctl_fib_sync_mem, 615 .maxlen = sizeof(sysctl_fib_sync_mem), 616 .mode = 0644, 617 .proc_handler = proc_douintvec_minmax, 618 .extra1 = &sysctl_fib_sync_mem_min, 619 .extra2 = &sysctl_fib_sync_mem_max, 620 }, 621 }; 622 623 static struct ctl_table ipv4_net_table[] = { 624 { 625 .procname = "tcp_max_tw_buckets", 626 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, 627 .maxlen = sizeof(int), 628 .mode = 0644, 629 .proc_handler = proc_dointvec 630 }, 631 { 632 .procname = "icmp_echo_ignore_all", 633 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, 634 .maxlen = sizeof(u8), 635 .mode = 0644, 636 .proc_handler = proc_dou8vec_minmax, 637 .extra1 = SYSCTL_ZERO, 638 .extra2 = SYSCTL_ONE 639 }, 640 { 641 .procname = "icmp_echo_enable_probe", 642 .data = &init_net.ipv4.sysctl_icmp_echo_enable_probe, 643 .maxlen = sizeof(u8), 644 .mode = 0644, 645 .proc_handler = proc_dou8vec_minmax, 646 .extra1 = SYSCTL_ZERO, 647 .extra2 = SYSCTL_ONE 648 }, 649 { 650 .procname = "icmp_echo_ignore_broadcasts", 651 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, 652 .maxlen = sizeof(u8), 653 .mode = 0644, 654 .proc_handler = proc_dou8vec_minmax, 655 .extra1 = SYSCTL_ZERO, 656 .extra2 = SYSCTL_ONE 657 }, 658 { 659 .procname = "icmp_ignore_bogus_error_responses", 660 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, 661 .maxlen = sizeof(u8), 662 .mode = 0644, 663 .proc_handler = proc_dou8vec_minmax, 664 .extra1 = SYSCTL_ZERO, 665 .extra2 = SYSCTL_ONE 666 }, 667 { 668 .procname = "icmp_errors_use_inbound_ifaddr", 669 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, 670 .maxlen = sizeof(u8), 671 .mode = 0644, 672 .proc_handler = proc_dou8vec_minmax, 673 .extra1 = SYSCTL_ZERO, 674 .extra2 = SYSCTL_ONE 675 }, 676 { 677 .procname = "icmp_ratelimit", 678 .data = &init_net.ipv4.sysctl_icmp_ratelimit, 679 .maxlen = sizeof(int), 680 .mode = 0644, 681 .proc_handler = proc_dointvec_ms_jiffies, 682 }, 683 { 684 .procname = "icmp_ratemask", 685 .data = &init_net.ipv4.sysctl_icmp_ratemask, 686 .maxlen = sizeof(int), 687 .mode = 0644, 688 .proc_handler = proc_dointvec 689 }, 690 { 691 .procname = "icmp_msgs_per_sec", 692 .data = &init_net.ipv4.sysctl_icmp_msgs_per_sec, 693 .maxlen = sizeof(int), 694 .mode = 0644, 695 .proc_handler = proc_dointvec_minmax, 696 .extra1 = SYSCTL_ZERO, 697 }, 698 { 699 .procname = "icmp_msgs_burst", 700 .data = &init_net.ipv4.sysctl_icmp_msgs_burst, 701 .maxlen = sizeof(int), 702 .mode = 0644, 703 .proc_handler = proc_dointvec_minmax, 704 .extra1 = SYSCTL_ZERO, 705 }, 706 { 707 .procname = "ping_group_range", 708 .data = &init_net.ipv4.ping_group_range.range, 709 .maxlen = sizeof(gid_t)*2, 710 .mode = 0644, 711 .proc_handler = ipv4_ping_group_range, 712 }, 713 #ifdef CONFIG_NET_L3_MASTER_DEV 714 { 715 .procname = "raw_l3mdev_accept", 716 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept, 717 .maxlen = sizeof(u8), 718 .mode = 0644, 719 .proc_handler = proc_dou8vec_minmax, 720 .extra1 = SYSCTL_ZERO, 721 .extra2 = SYSCTL_ONE, 722 }, 723 #endif 724 { 725 .procname = "tcp_ecn", 726 .data = &init_net.ipv4.sysctl_tcp_ecn, 727 .maxlen = sizeof(u8), 728 .mode = 0644, 729 .proc_handler = proc_dou8vec_minmax, 730 .extra1 = SYSCTL_ZERO, 731 .extra2 = SYSCTL_TWO, 732 }, 733 { 734 .procname = "tcp_ecn_fallback", 735 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback, 736 .maxlen = sizeof(u8), 737 .mode = 0644, 738 .proc_handler = proc_dou8vec_minmax, 739 .extra1 = SYSCTL_ZERO, 740 .extra2 = SYSCTL_ONE, 741 }, 742 { 743 .procname = "ip_dynaddr", 744 .data = &init_net.ipv4.sysctl_ip_dynaddr, 745 .maxlen = sizeof(u8), 746 .mode = 0644, 747 .proc_handler = proc_dou8vec_minmax, 748 }, 749 { 750 .procname = "ip_early_demux", 751 .data = &init_net.ipv4.sysctl_ip_early_demux, 752 .maxlen = sizeof(u8), 753 .mode = 0644, 754 .proc_handler = proc_dou8vec_minmax, 755 }, 756 { 757 .procname = "udp_early_demux", 758 .data = &init_net.ipv4.sysctl_udp_early_demux, 759 .maxlen = sizeof(u8), 760 .mode = 0644, 761 .proc_handler = proc_dou8vec_minmax, 762 }, 763 { 764 .procname = "tcp_early_demux", 765 .data = &init_net.ipv4.sysctl_tcp_early_demux, 766 .maxlen = sizeof(u8), 767 .mode = 0644, 768 .proc_handler = proc_dou8vec_minmax, 769 }, 770 { 771 .procname = "nexthop_compat_mode", 772 .data = &init_net.ipv4.sysctl_nexthop_compat_mode, 773 .maxlen = sizeof(u8), 774 .mode = 0644, 775 .proc_handler = proc_dou8vec_minmax, 776 .extra1 = SYSCTL_ZERO, 777 .extra2 = SYSCTL_ONE, 778 }, 779 { 780 .procname = "ip_default_ttl", 781 .data = &init_net.ipv4.sysctl_ip_default_ttl, 782 .maxlen = sizeof(u8), 783 .mode = 0644, 784 .proc_handler = proc_dou8vec_minmax, 785 .extra1 = &ip_ttl_min, 786 .extra2 = &ip_ttl_max, 787 }, 788 { 789 .procname = "ip_local_port_range", 790 .maxlen = 0, 791 .data = &init_net, 792 .mode = 0644, 793 .proc_handler = ipv4_local_port_range, 794 }, 795 { 796 .procname = "ip_local_reserved_ports", 797 .data = &init_net.ipv4.sysctl_local_reserved_ports, 798 .maxlen = 65536, 799 .mode = 0644, 800 .proc_handler = proc_do_large_bitmap, 801 }, 802 { 803 .procname = "ip_no_pmtu_disc", 804 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc, 805 .maxlen = sizeof(u8), 806 .mode = 0644, 807 .proc_handler = proc_dou8vec_minmax, 808 }, 809 { 810 .procname = "ip_forward_use_pmtu", 811 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu, 812 .maxlen = sizeof(u8), 813 .mode = 0644, 814 .proc_handler = proc_dou8vec_minmax, 815 }, 816 { 817 .procname = "ip_forward_update_priority", 818 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority, 819 .maxlen = sizeof(u8), 820 .mode = 0644, 821 .proc_handler = ipv4_fwd_update_priority, 822 .extra1 = SYSCTL_ZERO, 823 .extra2 = SYSCTL_ONE, 824 }, 825 { 826 .procname = "ip_nonlocal_bind", 827 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind, 828 .maxlen = sizeof(u8), 829 .mode = 0644, 830 .proc_handler = proc_dou8vec_minmax, 831 }, 832 { 833 .procname = "ip_autobind_reuse", 834 .data = &init_net.ipv4.sysctl_ip_autobind_reuse, 835 .maxlen = sizeof(u8), 836 .mode = 0644, 837 .proc_handler = proc_dou8vec_minmax, 838 .extra1 = SYSCTL_ZERO, 839 .extra2 = SYSCTL_ONE, 840 }, 841 { 842 .procname = "fwmark_reflect", 843 .data = &init_net.ipv4.sysctl_fwmark_reflect, 844 .maxlen = sizeof(u8), 845 .mode = 0644, 846 .proc_handler = proc_dou8vec_minmax, 847 }, 848 { 849 .procname = "tcp_fwmark_accept", 850 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept, 851 .maxlen = sizeof(u8), 852 .mode = 0644, 853 .proc_handler = proc_dou8vec_minmax, 854 }, 855 #ifdef CONFIG_NET_L3_MASTER_DEV 856 { 857 .procname = "tcp_l3mdev_accept", 858 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept, 859 .maxlen = sizeof(u8), 860 .mode = 0644, 861 .proc_handler = proc_dou8vec_minmax, 862 .extra1 = SYSCTL_ZERO, 863 .extra2 = SYSCTL_ONE, 864 }, 865 #endif 866 { 867 .procname = "tcp_mtu_probing", 868 .data = &init_net.ipv4.sysctl_tcp_mtu_probing, 869 .maxlen = sizeof(u8), 870 .mode = 0644, 871 .proc_handler = proc_dou8vec_minmax, 872 }, 873 { 874 .procname = "tcp_base_mss", 875 .data = &init_net.ipv4.sysctl_tcp_base_mss, 876 .maxlen = sizeof(int), 877 .mode = 0644, 878 .proc_handler = proc_dointvec, 879 }, 880 { 881 .procname = "tcp_min_snd_mss", 882 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss, 883 .maxlen = sizeof(int), 884 .mode = 0644, 885 .proc_handler = proc_dointvec_minmax, 886 .extra1 = &tcp_min_snd_mss_min, 887 .extra2 = &tcp_min_snd_mss_max, 888 }, 889 { 890 .procname = "tcp_mtu_probe_floor", 891 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor, 892 .maxlen = sizeof(int), 893 .mode = 0644, 894 .proc_handler = proc_dointvec_minmax, 895 .extra1 = &tcp_min_snd_mss_min, 896 .extra2 = &tcp_min_snd_mss_max, 897 }, 898 { 899 .procname = "tcp_probe_threshold", 900 .data = &init_net.ipv4.sysctl_tcp_probe_threshold, 901 .maxlen = sizeof(int), 902 .mode = 0644, 903 .proc_handler = proc_dointvec, 904 }, 905 { 906 .procname = "tcp_probe_interval", 907 .data = &init_net.ipv4.sysctl_tcp_probe_interval, 908 .maxlen = sizeof(u32), 909 .mode = 0644, 910 .proc_handler = proc_douintvec_minmax, 911 .extra2 = &u32_max_div_HZ, 912 }, 913 { 914 .procname = "igmp_link_local_mcast_reports", 915 .data = &init_net.ipv4.sysctl_igmp_llm_reports, 916 .maxlen = sizeof(u8), 917 .mode = 0644, 918 .proc_handler = proc_dou8vec_minmax, 919 }, 920 { 921 .procname = "igmp_max_memberships", 922 .data = &init_net.ipv4.sysctl_igmp_max_memberships, 923 .maxlen = sizeof(int), 924 .mode = 0644, 925 .proc_handler = proc_dointvec 926 }, 927 { 928 .procname = "igmp_max_msf", 929 .data = &init_net.ipv4.sysctl_igmp_max_msf, 930 .maxlen = sizeof(int), 931 .mode = 0644, 932 .proc_handler = proc_dointvec 933 }, 934 #ifdef CONFIG_IP_MULTICAST 935 { 936 .procname = "igmp_qrv", 937 .data = &init_net.ipv4.sysctl_igmp_qrv, 938 .maxlen = sizeof(int), 939 .mode = 0644, 940 .proc_handler = proc_dointvec_minmax, 941 .extra1 = SYSCTL_ONE 942 }, 943 #endif 944 { 945 .procname = "tcp_congestion_control", 946 .data = &init_net.ipv4.tcp_congestion_control, 947 .mode = 0644, 948 .maxlen = TCP_CA_NAME_MAX, 949 .proc_handler = proc_tcp_congestion_control, 950 }, 951 { 952 .procname = "tcp_available_congestion_control", 953 .maxlen = TCP_CA_BUF_MAX, 954 .mode = 0444, 955 .proc_handler = proc_tcp_available_congestion_control, 956 }, 957 { 958 .procname = "tcp_allowed_congestion_control", 959 .maxlen = TCP_CA_BUF_MAX, 960 .mode = 0644, 961 .proc_handler = proc_allowed_congestion_control, 962 }, 963 { 964 .procname = "tcp_keepalive_time", 965 .data = &init_net.ipv4.sysctl_tcp_keepalive_time, 966 .maxlen = sizeof(int), 967 .mode = 0644, 968 .proc_handler = proc_dointvec_jiffies, 969 }, 970 { 971 .procname = "tcp_keepalive_probes", 972 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes, 973 .maxlen = sizeof(u8), 974 .mode = 0644, 975 .proc_handler = proc_dou8vec_minmax, 976 }, 977 { 978 .procname = "tcp_keepalive_intvl", 979 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl, 980 .maxlen = sizeof(int), 981 .mode = 0644, 982 .proc_handler = proc_dointvec_jiffies, 983 }, 984 { 985 .procname = "tcp_syn_retries", 986 .data = &init_net.ipv4.sysctl_tcp_syn_retries, 987 .maxlen = sizeof(u8), 988 .mode = 0644, 989 .proc_handler = proc_dou8vec_minmax, 990 .extra1 = &tcp_syn_retries_min, 991 .extra2 = &tcp_syn_retries_max 992 }, 993 { 994 .procname = "tcp_synack_retries", 995 .data = &init_net.ipv4.sysctl_tcp_synack_retries, 996 .maxlen = sizeof(u8), 997 .mode = 0644, 998 .proc_handler = proc_dou8vec_minmax, 999 }, 1000 #ifdef CONFIG_SYN_COOKIES 1001 { 1002 .procname = "tcp_syncookies", 1003 .data = &init_net.ipv4.sysctl_tcp_syncookies, 1004 .maxlen = sizeof(u8), 1005 .mode = 0644, 1006 .proc_handler = proc_dou8vec_minmax, 1007 }, 1008 #endif 1009 { 1010 .procname = "tcp_migrate_req", 1011 .data = &init_net.ipv4.sysctl_tcp_migrate_req, 1012 .maxlen = sizeof(u8), 1013 .mode = 0644, 1014 .proc_handler = proc_dou8vec_minmax, 1015 .extra1 = SYSCTL_ZERO, 1016 .extra2 = SYSCTL_ONE 1017 }, 1018 { 1019 .procname = "tcp_reordering", 1020 .data = &init_net.ipv4.sysctl_tcp_reordering, 1021 .maxlen = sizeof(int), 1022 .mode = 0644, 1023 .proc_handler = proc_dointvec 1024 }, 1025 { 1026 .procname = "tcp_retries1", 1027 .data = &init_net.ipv4.sysctl_tcp_retries1, 1028 .maxlen = sizeof(u8), 1029 .mode = 0644, 1030 .proc_handler = proc_dou8vec_minmax, 1031 .extra2 = &tcp_retr1_max 1032 }, 1033 { 1034 .procname = "tcp_retries2", 1035 .data = &init_net.ipv4.sysctl_tcp_retries2, 1036 .maxlen = sizeof(u8), 1037 .mode = 0644, 1038 .proc_handler = proc_dou8vec_minmax, 1039 }, 1040 { 1041 .procname = "tcp_orphan_retries", 1042 .data = &init_net.ipv4.sysctl_tcp_orphan_retries, 1043 .maxlen = sizeof(u8), 1044 .mode = 0644, 1045 .proc_handler = proc_dou8vec_minmax, 1046 }, 1047 { 1048 .procname = "tcp_fin_timeout", 1049 .data = &init_net.ipv4.sysctl_tcp_fin_timeout, 1050 .maxlen = sizeof(int), 1051 .mode = 0644, 1052 .proc_handler = proc_dointvec_jiffies, 1053 }, 1054 { 1055 .procname = "tcp_notsent_lowat", 1056 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat, 1057 .maxlen = sizeof(unsigned int), 1058 .mode = 0644, 1059 .proc_handler = proc_douintvec, 1060 }, 1061 { 1062 .procname = "tcp_tw_reuse", 1063 .data = &init_net.ipv4.sysctl_tcp_tw_reuse, 1064 .maxlen = sizeof(u8), 1065 .mode = 0644, 1066 .proc_handler = proc_dou8vec_minmax, 1067 .extra1 = SYSCTL_ZERO, 1068 .extra2 = SYSCTL_TWO, 1069 }, 1070 { 1071 .procname = "tcp_tw_reuse_delay", 1072 .data = &init_net.ipv4.sysctl_tcp_tw_reuse_delay, 1073 .maxlen = sizeof(unsigned int), 1074 .mode = 0644, 1075 .proc_handler = proc_douintvec_minmax, 1076 .extra1 = SYSCTL_ONE, 1077 .extra2 = &tcp_tw_reuse_delay_max, 1078 }, 1079 { 1080 .procname = "tcp_max_syn_backlog", 1081 .data = &init_net.ipv4.sysctl_max_syn_backlog, 1082 .maxlen = sizeof(int), 1083 .mode = 0644, 1084 .proc_handler = proc_dointvec 1085 }, 1086 { 1087 .procname = "tcp_fastopen", 1088 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1089 .maxlen = sizeof(int), 1090 .mode = 0644, 1091 .proc_handler = proc_dointvec, 1092 }, 1093 { 1094 .procname = "tcp_fastopen_key", 1095 .mode = 0600, 1096 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1097 /* maxlen to print the list of keys in hex (*2), with dashes 1098 * separating doublewords and a comma in between keys. 1099 */ 1100 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 1101 2 * TCP_FASTOPEN_KEY_MAX) + 1102 (TCP_FASTOPEN_KEY_MAX * 5)), 1103 .proc_handler = proc_tcp_fastopen_key, 1104 }, 1105 { 1106 .procname = "tcp_fastopen_blackhole_timeout_sec", 1107 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout, 1108 .maxlen = sizeof(int), 1109 .mode = 0644, 1110 .proc_handler = proc_tfo_blackhole_detect_timeout, 1111 .extra1 = SYSCTL_ZERO, 1112 }, 1113 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1114 { 1115 .procname = "fib_multipath_use_neigh", 1116 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh, 1117 .maxlen = sizeof(u8), 1118 .mode = 0644, 1119 .proc_handler = proc_dou8vec_minmax, 1120 .extra1 = SYSCTL_ZERO, 1121 .extra2 = SYSCTL_ONE, 1122 }, 1123 { 1124 .procname = "fib_multipath_hash_policy", 1125 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy, 1126 .maxlen = sizeof(u8), 1127 .mode = 0644, 1128 .proc_handler = proc_fib_multipath_hash_policy, 1129 .extra1 = SYSCTL_ZERO, 1130 .extra2 = SYSCTL_THREE, 1131 }, 1132 { 1133 .procname = "fib_multipath_hash_fields", 1134 .data = &init_net.ipv4.sysctl_fib_multipath_hash_fields, 1135 .maxlen = sizeof(u32), 1136 .mode = 0644, 1137 .proc_handler = proc_fib_multipath_hash_fields, 1138 .extra1 = SYSCTL_ONE, 1139 .extra2 = &fib_multipath_hash_fields_all_mask, 1140 }, 1141 { 1142 .procname = "fib_multipath_hash_seed", 1143 .data = &init_net, 1144 .maxlen = sizeof(u32), 1145 .mode = 0644, 1146 .proc_handler = proc_fib_multipath_hash_seed, 1147 }, 1148 #endif 1149 { 1150 .procname = "ip_unprivileged_port_start", 1151 .maxlen = sizeof(int), 1152 .data = &init_net.ipv4.sysctl_ip_prot_sock, 1153 .mode = 0644, 1154 .proc_handler = ipv4_privileged_ports, 1155 }, 1156 #ifdef CONFIG_NET_L3_MASTER_DEV 1157 { 1158 .procname = "udp_l3mdev_accept", 1159 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept, 1160 .maxlen = sizeof(u8), 1161 .mode = 0644, 1162 .proc_handler = proc_dou8vec_minmax, 1163 .extra1 = SYSCTL_ZERO, 1164 .extra2 = SYSCTL_ONE, 1165 }, 1166 #endif 1167 { 1168 .procname = "tcp_sack", 1169 .data = &init_net.ipv4.sysctl_tcp_sack, 1170 .maxlen = sizeof(u8), 1171 .mode = 0644, 1172 .proc_handler = proc_dou8vec_minmax, 1173 }, 1174 { 1175 .procname = "tcp_window_scaling", 1176 .data = &init_net.ipv4.sysctl_tcp_window_scaling, 1177 .maxlen = sizeof(u8), 1178 .mode = 0644, 1179 .proc_handler = proc_dou8vec_minmax, 1180 }, 1181 { 1182 .procname = "tcp_timestamps", 1183 .data = &init_net.ipv4.sysctl_tcp_timestamps, 1184 .maxlen = sizeof(u8), 1185 .mode = 0644, 1186 .proc_handler = proc_dou8vec_minmax, 1187 }, 1188 { 1189 .procname = "tcp_early_retrans", 1190 .data = &init_net.ipv4.sysctl_tcp_early_retrans, 1191 .maxlen = sizeof(u8), 1192 .mode = 0644, 1193 .proc_handler = proc_dou8vec_minmax, 1194 .extra1 = SYSCTL_ZERO, 1195 .extra2 = SYSCTL_FOUR, 1196 }, 1197 { 1198 .procname = "tcp_recovery", 1199 .data = &init_net.ipv4.sysctl_tcp_recovery, 1200 .maxlen = sizeof(u8), 1201 .mode = 0644, 1202 .proc_handler = proc_dou8vec_minmax, 1203 }, 1204 { 1205 .procname = "tcp_thin_linear_timeouts", 1206 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts, 1207 .maxlen = sizeof(u8), 1208 .mode = 0644, 1209 .proc_handler = proc_dou8vec_minmax, 1210 }, 1211 { 1212 .procname = "tcp_slow_start_after_idle", 1213 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle, 1214 .maxlen = sizeof(u8), 1215 .mode = 0644, 1216 .proc_handler = proc_dou8vec_minmax, 1217 }, 1218 { 1219 .procname = "tcp_retrans_collapse", 1220 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse, 1221 .maxlen = sizeof(u8), 1222 .mode = 0644, 1223 .proc_handler = proc_dou8vec_minmax, 1224 }, 1225 { 1226 .procname = "tcp_stdurg", 1227 .data = &init_net.ipv4.sysctl_tcp_stdurg, 1228 .maxlen = sizeof(u8), 1229 .mode = 0644, 1230 .proc_handler = proc_dou8vec_minmax, 1231 }, 1232 { 1233 .procname = "tcp_rfc1337", 1234 .data = &init_net.ipv4.sysctl_tcp_rfc1337, 1235 .maxlen = sizeof(u8), 1236 .mode = 0644, 1237 .proc_handler = proc_dou8vec_minmax, 1238 }, 1239 { 1240 .procname = "tcp_abort_on_overflow", 1241 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow, 1242 .maxlen = sizeof(u8), 1243 .mode = 0644, 1244 .proc_handler = proc_dou8vec_minmax, 1245 }, 1246 { 1247 .procname = "tcp_fack", 1248 .data = &init_net.ipv4.sysctl_tcp_fack, 1249 .maxlen = sizeof(u8), 1250 .mode = 0644, 1251 .proc_handler = proc_dou8vec_minmax, 1252 }, 1253 { 1254 .procname = "tcp_max_reordering", 1255 .data = &init_net.ipv4.sysctl_tcp_max_reordering, 1256 .maxlen = sizeof(int), 1257 .mode = 0644, 1258 .proc_handler = proc_dointvec 1259 }, 1260 { 1261 .procname = "tcp_dsack", 1262 .data = &init_net.ipv4.sysctl_tcp_dsack, 1263 .maxlen = sizeof(u8), 1264 .mode = 0644, 1265 .proc_handler = proc_dou8vec_minmax, 1266 }, 1267 { 1268 .procname = "tcp_app_win", 1269 .data = &init_net.ipv4.sysctl_tcp_app_win, 1270 .maxlen = sizeof(u8), 1271 .mode = 0644, 1272 .proc_handler = proc_dou8vec_minmax, 1273 .extra1 = SYSCTL_ZERO, 1274 .extra2 = &tcp_app_win_max, 1275 }, 1276 { 1277 .procname = "tcp_adv_win_scale", 1278 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale, 1279 .maxlen = sizeof(int), 1280 .mode = 0644, 1281 .proc_handler = proc_dointvec_minmax, 1282 .extra1 = &tcp_adv_win_scale_min, 1283 .extra2 = &tcp_adv_win_scale_max, 1284 }, 1285 { 1286 .procname = "tcp_frto", 1287 .data = &init_net.ipv4.sysctl_tcp_frto, 1288 .maxlen = sizeof(u8), 1289 .mode = 0644, 1290 .proc_handler = proc_dou8vec_minmax, 1291 }, 1292 { 1293 .procname = "tcp_no_metrics_save", 1294 .data = &init_net.ipv4.sysctl_tcp_nometrics_save, 1295 .maxlen = sizeof(u8), 1296 .mode = 0644, 1297 .proc_handler = proc_dou8vec_minmax, 1298 }, 1299 { 1300 .procname = "tcp_no_ssthresh_metrics_save", 1301 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save, 1302 .maxlen = sizeof(u8), 1303 .mode = 0644, 1304 .proc_handler = proc_dou8vec_minmax, 1305 .extra1 = SYSCTL_ZERO, 1306 .extra2 = SYSCTL_ONE, 1307 }, 1308 { 1309 .procname = "tcp_moderate_rcvbuf", 1310 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf, 1311 .maxlen = sizeof(u8), 1312 .mode = 0644, 1313 .proc_handler = proc_dou8vec_minmax, 1314 }, 1315 { 1316 .procname = "tcp_tso_win_divisor", 1317 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor, 1318 .maxlen = sizeof(u8), 1319 .mode = 0644, 1320 .proc_handler = proc_dou8vec_minmax, 1321 }, 1322 { 1323 .procname = "tcp_workaround_signed_windows", 1324 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows, 1325 .maxlen = sizeof(u8), 1326 .mode = 0644, 1327 .proc_handler = proc_dou8vec_minmax, 1328 }, 1329 { 1330 .procname = "tcp_limit_output_bytes", 1331 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes, 1332 .maxlen = sizeof(int), 1333 .mode = 0644, 1334 .proc_handler = proc_dointvec 1335 }, 1336 { 1337 .procname = "tcp_challenge_ack_limit", 1338 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit, 1339 .maxlen = sizeof(int), 1340 .mode = 0644, 1341 .proc_handler = proc_dointvec 1342 }, 1343 { 1344 .procname = "tcp_min_tso_segs", 1345 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs, 1346 .maxlen = sizeof(u8), 1347 .mode = 0644, 1348 .proc_handler = proc_dou8vec_minmax, 1349 .extra1 = SYSCTL_ONE, 1350 }, 1351 { 1352 .procname = "tcp_tso_rtt_log", 1353 .data = &init_net.ipv4.sysctl_tcp_tso_rtt_log, 1354 .maxlen = sizeof(u8), 1355 .mode = 0644, 1356 .proc_handler = proc_dou8vec_minmax, 1357 }, 1358 { 1359 .procname = "tcp_min_rtt_wlen", 1360 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen, 1361 .maxlen = sizeof(int), 1362 .mode = 0644, 1363 .proc_handler = proc_dointvec_minmax, 1364 .extra1 = SYSCTL_ZERO, 1365 .extra2 = &one_day_secs 1366 }, 1367 { 1368 .procname = "tcp_autocorking", 1369 .data = &init_net.ipv4.sysctl_tcp_autocorking, 1370 .maxlen = sizeof(u8), 1371 .mode = 0644, 1372 .proc_handler = proc_dou8vec_minmax, 1373 .extra1 = SYSCTL_ZERO, 1374 .extra2 = SYSCTL_ONE, 1375 }, 1376 { 1377 .procname = "tcp_invalid_ratelimit", 1378 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit, 1379 .maxlen = sizeof(int), 1380 .mode = 0644, 1381 .proc_handler = proc_dointvec_ms_jiffies, 1382 }, 1383 { 1384 .procname = "tcp_pacing_ss_ratio", 1385 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio, 1386 .maxlen = sizeof(int), 1387 .mode = 0644, 1388 .proc_handler = proc_dointvec_minmax, 1389 .extra1 = SYSCTL_ZERO, 1390 .extra2 = SYSCTL_ONE_THOUSAND, 1391 }, 1392 { 1393 .procname = "tcp_pacing_ca_ratio", 1394 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio, 1395 .maxlen = sizeof(int), 1396 .mode = 0644, 1397 .proc_handler = proc_dointvec_minmax, 1398 .extra1 = SYSCTL_ZERO, 1399 .extra2 = SYSCTL_ONE_THOUSAND, 1400 }, 1401 { 1402 .procname = "tcp_wmem", 1403 .data = &init_net.ipv4.sysctl_tcp_wmem, 1404 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem), 1405 .mode = 0644, 1406 .proc_handler = proc_dointvec_minmax, 1407 .extra1 = SYSCTL_ONE, 1408 }, 1409 { 1410 .procname = "tcp_rmem", 1411 .data = &init_net.ipv4.sysctl_tcp_rmem, 1412 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem), 1413 .mode = 0644, 1414 .proc_handler = proc_dointvec_minmax, 1415 .extra1 = SYSCTL_ONE, 1416 }, 1417 { 1418 .procname = "tcp_comp_sack_delay_ns", 1419 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns, 1420 .maxlen = sizeof(unsigned long), 1421 .mode = 0644, 1422 .proc_handler = proc_doulongvec_minmax, 1423 }, 1424 { 1425 .procname = "tcp_comp_sack_slack_ns", 1426 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns, 1427 .maxlen = sizeof(unsigned long), 1428 .mode = 0644, 1429 .proc_handler = proc_doulongvec_minmax, 1430 }, 1431 { 1432 .procname = "tcp_comp_sack_nr", 1433 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr, 1434 .maxlen = sizeof(u8), 1435 .mode = 0644, 1436 .proc_handler = proc_dou8vec_minmax, 1437 .extra1 = SYSCTL_ZERO, 1438 }, 1439 { 1440 .procname = "tcp_backlog_ack_defer", 1441 .data = &init_net.ipv4.sysctl_tcp_backlog_ack_defer, 1442 .maxlen = sizeof(u8), 1443 .mode = 0644, 1444 .proc_handler = proc_dou8vec_minmax, 1445 .extra1 = SYSCTL_ZERO, 1446 .extra2 = SYSCTL_ONE, 1447 }, 1448 { 1449 .procname = "tcp_reflect_tos", 1450 .data = &init_net.ipv4.sysctl_tcp_reflect_tos, 1451 .maxlen = sizeof(u8), 1452 .mode = 0644, 1453 .proc_handler = proc_dou8vec_minmax, 1454 .extra1 = SYSCTL_ZERO, 1455 .extra2 = SYSCTL_ONE, 1456 }, 1457 { 1458 .procname = "tcp_ehash_entries", 1459 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries, 1460 .mode = 0444, 1461 .proc_handler = proc_tcp_ehash_entries, 1462 }, 1463 { 1464 .procname = "tcp_child_ehash_entries", 1465 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries, 1466 .maxlen = sizeof(unsigned int), 1467 .mode = 0644, 1468 .proc_handler = proc_douintvec_minmax, 1469 .extra1 = SYSCTL_ZERO, 1470 .extra2 = &tcp_child_ehash_entries_max, 1471 }, 1472 { 1473 .procname = "udp_hash_entries", 1474 .data = &init_net.ipv4.sysctl_udp_child_hash_entries, 1475 .mode = 0444, 1476 .proc_handler = proc_udp_hash_entries, 1477 }, 1478 { 1479 .procname = "udp_child_hash_entries", 1480 .data = &init_net.ipv4.sysctl_udp_child_hash_entries, 1481 .maxlen = sizeof(unsigned int), 1482 .mode = 0644, 1483 .proc_handler = proc_douintvec_minmax, 1484 .extra1 = SYSCTL_ZERO, 1485 .extra2 = &udp_child_hash_entries_max, 1486 }, 1487 { 1488 .procname = "udp_rmem_min", 1489 .data = &init_net.ipv4.sysctl_udp_rmem_min, 1490 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min), 1491 .mode = 0644, 1492 .proc_handler = proc_dointvec_minmax, 1493 .extra1 = SYSCTL_ONE 1494 }, 1495 { 1496 .procname = "udp_wmem_min", 1497 .data = &init_net.ipv4.sysctl_udp_wmem_min, 1498 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min), 1499 .mode = 0644, 1500 .proc_handler = proc_dointvec_minmax, 1501 .extra1 = SYSCTL_ONE 1502 }, 1503 { 1504 .procname = "fib_notify_on_flag_change", 1505 .data = &init_net.ipv4.sysctl_fib_notify_on_flag_change, 1506 .maxlen = sizeof(u8), 1507 .mode = 0644, 1508 .proc_handler = proc_dou8vec_minmax, 1509 .extra1 = SYSCTL_ZERO, 1510 .extra2 = SYSCTL_TWO, 1511 }, 1512 { 1513 .procname = "tcp_plb_enabled", 1514 .data = &init_net.ipv4.sysctl_tcp_plb_enabled, 1515 .maxlen = sizeof(u8), 1516 .mode = 0644, 1517 .proc_handler = proc_dou8vec_minmax, 1518 .extra1 = SYSCTL_ZERO, 1519 .extra2 = SYSCTL_ONE, 1520 }, 1521 { 1522 .procname = "tcp_plb_idle_rehash_rounds", 1523 .data = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds, 1524 .maxlen = sizeof(u8), 1525 .mode = 0644, 1526 .proc_handler = proc_dou8vec_minmax, 1527 .extra2 = &tcp_plb_max_rounds, 1528 }, 1529 { 1530 .procname = "tcp_plb_rehash_rounds", 1531 .data = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds, 1532 .maxlen = sizeof(u8), 1533 .mode = 0644, 1534 .proc_handler = proc_dou8vec_minmax, 1535 .extra2 = &tcp_plb_max_rounds, 1536 }, 1537 { 1538 .procname = "tcp_plb_suspend_rto_sec", 1539 .data = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec, 1540 .maxlen = sizeof(u8), 1541 .mode = 0644, 1542 .proc_handler = proc_dou8vec_minmax, 1543 }, 1544 { 1545 .procname = "tcp_plb_cong_thresh", 1546 .data = &init_net.ipv4.sysctl_tcp_plb_cong_thresh, 1547 .maxlen = sizeof(int), 1548 .mode = 0644, 1549 .proc_handler = proc_dointvec_minmax, 1550 .extra1 = SYSCTL_ZERO, 1551 .extra2 = &tcp_plb_max_cong_thresh, 1552 }, 1553 { 1554 .procname = "tcp_syn_linear_timeouts", 1555 .data = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts, 1556 .maxlen = sizeof(u8), 1557 .mode = 0644, 1558 .proc_handler = proc_dou8vec_minmax, 1559 .extra1 = SYSCTL_ZERO, 1560 .extra2 = &tcp_syn_linear_timeouts_max, 1561 }, 1562 { 1563 .procname = "tcp_shrink_window", 1564 .data = &init_net.ipv4.sysctl_tcp_shrink_window, 1565 .maxlen = sizeof(u8), 1566 .mode = 0644, 1567 .proc_handler = proc_dou8vec_minmax, 1568 .extra1 = SYSCTL_ZERO, 1569 .extra2 = SYSCTL_ONE, 1570 }, 1571 { 1572 .procname = "tcp_pingpong_thresh", 1573 .data = &init_net.ipv4.sysctl_tcp_pingpong_thresh, 1574 .maxlen = sizeof(u8), 1575 .mode = 0644, 1576 .proc_handler = proc_dou8vec_minmax, 1577 .extra1 = SYSCTL_ONE, 1578 }, 1579 { 1580 .procname = "tcp_rto_min_us", 1581 .data = &init_net.ipv4.sysctl_tcp_rto_min_us, 1582 .maxlen = sizeof(int), 1583 .mode = 0644, 1584 .proc_handler = proc_dointvec_minmax, 1585 .extra1 = SYSCTL_ONE, 1586 }, 1587 { 1588 .procname = "tcp_rto_max_ms", 1589 .data = &init_net.ipv4.sysctl_tcp_rto_max_ms, 1590 .maxlen = sizeof(int), 1591 .mode = 0644, 1592 .proc_handler = proc_dointvec_minmax, 1593 .extra1 = SYSCTL_ONE_THOUSAND, 1594 .extra2 = &tcp_rto_max_max, 1595 }, 1596 }; 1597 1598 static __net_init int ipv4_sysctl_init_net(struct net *net) 1599 { 1600 size_t table_size = ARRAY_SIZE(ipv4_net_table); 1601 struct ctl_table *table; 1602 1603 table = ipv4_net_table; 1604 if (!net_eq(net, &init_net)) { 1605 int i; 1606 1607 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); 1608 if (!table) 1609 goto err_alloc; 1610 1611 for (i = 0; i < table_size; i++) { 1612 if (table[i].data) { 1613 /* Update the variables to point into 1614 * the current struct net 1615 */ 1616 table[i].data += (void *)net - (void *)&init_net; 1617 } else { 1618 /* Entries without data pointer are global; 1619 * Make them read-only in non-init_net ns 1620 */ 1621 table[i].mode &= ~0222; 1622 } 1623 } 1624 } 1625 1626 net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table, 1627 table_size); 1628 if (!net->ipv4.ipv4_hdr) 1629 goto err_reg; 1630 1631 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1632 if (!net->ipv4.sysctl_local_reserved_ports) 1633 goto err_ports; 1634 1635 proc_fib_multipath_hash_set_seed(net, 0); 1636 1637 return 0; 1638 1639 err_ports: 1640 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1641 err_reg: 1642 if (!net_eq(net, &init_net)) 1643 kfree(table); 1644 err_alloc: 1645 return -ENOMEM; 1646 } 1647 1648 static __net_exit void ipv4_sysctl_exit_net(struct net *net) 1649 { 1650 const struct ctl_table *table; 1651 1652 kfree(net->ipv4.sysctl_local_reserved_ports); 1653 table = net->ipv4.ipv4_hdr->ctl_table_arg; 1654 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1655 kfree(table); 1656 } 1657 1658 static __net_initdata struct pernet_operations ipv4_sysctl_ops = { 1659 .init = ipv4_sysctl_init_net, 1660 .exit = ipv4_sysctl_exit_net, 1661 }; 1662 1663 static __init int sysctl_ipv4_init(void) 1664 { 1665 struct ctl_table_header *hdr; 1666 1667 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table); 1668 if (!hdr) 1669 return -ENOMEM; 1670 1671 proc_fib_multipath_hash_init_rand_seed(); 1672 1673 if (register_pernet_subsys(&ipv4_sysctl_ops)) { 1674 unregister_net_sysctl_table(hdr); 1675 return -ENOMEM; 1676 } 1677 1678 return 0; 1679 } 1680 1681 __initcall(sysctl_ipv4_init); 1682