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 ip_privileged_port_min; 32 static int ip_privileged_port_max = 65535; 33 static int ip_ttl_min = 1; 34 static int ip_ttl_max = 255; 35 static int tcp_syn_retries_min = 1; 36 static int tcp_syn_retries_max = MAX_TCP_SYNCNT; 37 static int tcp_syn_linear_timeouts_max = MAX_TCP_SYNCNT; 38 static unsigned long ip_ping_group_range_min[] = { 0, 0 }; 39 static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX }; 40 static u32 u32_max_div_HZ = UINT_MAX / HZ; 41 static int one_day_secs = 24 * 3600; 42 static u32 fib_multipath_hash_fields_all_mask __maybe_unused = 43 FIB_MULTIPATH_HASH_FIELD_ALL_MASK; 44 static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024; 45 static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX; 46 static int tcp_plb_max_rounds = 31; 47 static int tcp_plb_max_cong_thresh = 256; 48 49 /* obsolete */ 50 static int sysctl_tcp_low_latency __read_mostly; 51 52 /* Update system visible IP port range */ 53 static void set_local_port_range(struct net *net, unsigned int low, unsigned int high) 54 { 55 bool same_parity = !((low ^ high) & 1); 56 57 if (same_parity && !net->ipv4.ip_local_ports.warned) { 58 net->ipv4.ip_local_ports.warned = true; 59 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n"); 60 } 61 WRITE_ONCE(net->ipv4.ip_local_ports.range, high << 16 | low); 62 } 63 64 /* Validate changes from /proc interface. */ 65 static int ipv4_local_port_range(const struct ctl_table *table, int write, 66 void *buffer, size_t *lenp, loff_t *ppos) 67 { 68 struct net *net = table->data; 69 int ret; 70 int range[2]; 71 struct ctl_table tmp = { 72 .data = &range, 73 .maxlen = sizeof(range), 74 .mode = table->mode, 75 .extra1 = &ip_local_port_range_min, 76 .extra2 = &ip_local_port_range_max, 77 }; 78 79 inet_get_local_port_range(net, &range[0], &range[1]); 80 81 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 82 83 if (write && ret == 0) { 84 /* Ensure that the upper limit is not smaller than the lower, 85 * and that the lower does not encroach upon the privileged 86 * port limit. 87 */ 88 if ((range[1] < range[0]) || 89 (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock))) 90 ret = -EINVAL; 91 else 92 set_local_port_range(net, range[0], range[1]); 93 } 94 95 return ret; 96 } 97 98 /* Validate changes from /proc interface. */ 99 static int ipv4_privileged_ports(const struct ctl_table *table, int write, 100 void *buffer, size_t *lenp, loff_t *ppos) 101 { 102 struct net *net = container_of(table->data, struct net, 103 ipv4.sysctl_ip_prot_sock); 104 int ret; 105 int pports; 106 int range[2]; 107 struct ctl_table tmp = { 108 .data = &pports, 109 .maxlen = sizeof(pports), 110 .mode = table->mode, 111 .extra1 = &ip_privileged_port_min, 112 .extra2 = &ip_privileged_port_max, 113 }; 114 115 pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock); 116 117 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 118 119 if (write && ret == 0) { 120 inet_get_local_port_range(net, &range[0], &range[1]); 121 /* Ensure that the local port range doesn't overlap with the 122 * privileged port range. 123 */ 124 if (range[0] < pports) 125 ret = -EINVAL; 126 else 127 WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports); 128 } 129 130 return ret; 131 } 132 133 static void inet_get_ping_group_range_table(const struct ctl_table *table, 134 kgid_t *low, kgid_t *high) 135 { 136 kgid_t *data = table->data; 137 struct net *net = 138 container_of(table->data, struct net, ipv4.ping_group_range.range); 139 unsigned int seq; 140 do { 141 seq = read_seqbegin(&net->ipv4.ping_group_range.lock); 142 143 *low = data[0]; 144 *high = data[1]; 145 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); 146 } 147 148 /* Update system visible IP port range */ 149 static void set_ping_group_range(const struct ctl_table *table, 150 kgid_t low, kgid_t high) 151 { 152 kgid_t *data = table->data; 153 struct net *net = 154 container_of(table->data, struct net, ipv4.ping_group_range.range); 155 write_seqlock(&net->ipv4.ping_group_range.lock); 156 data[0] = low; 157 data[1] = high; 158 write_sequnlock(&net->ipv4.ping_group_range.lock); 159 } 160 161 /* Validate changes from /proc interface. */ 162 static int ipv4_ping_group_range(const struct ctl_table *table, int write, 163 void *buffer, size_t *lenp, loff_t *ppos) 164 { 165 struct user_namespace *user_ns = current_user_ns(); 166 int ret; 167 unsigned long urange[2]; 168 kgid_t low, high; 169 struct ctl_table tmp = { 170 .data = &urange, 171 .maxlen = sizeof(urange), 172 .mode = table->mode, 173 .extra1 = &ip_ping_group_range_min, 174 .extra2 = &ip_ping_group_range_max, 175 }; 176 177 inet_get_ping_group_range_table(table, &low, &high); 178 urange[0] = from_kgid_munged(user_ns, low); 179 urange[1] = from_kgid_munged(user_ns, high); 180 ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos); 181 182 if (write && ret == 0) { 183 low = make_kgid(user_ns, urange[0]); 184 high = make_kgid(user_ns, urange[1]); 185 if (!gid_valid(low) || !gid_valid(high)) 186 return -EINVAL; 187 if (urange[1] < urange[0] || gid_lt(high, low)) { 188 low = make_kgid(&init_user_ns, 1); 189 high = make_kgid(&init_user_ns, 0); 190 } 191 set_ping_group_range(table, low, high); 192 } 193 194 return ret; 195 } 196 197 static int ipv4_fwd_update_priority(const struct ctl_table *table, int write, 198 void *buffer, size_t *lenp, loff_t *ppos) 199 { 200 struct net *net; 201 int ret; 202 203 net = container_of(table->data, struct net, 204 ipv4.sysctl_ip_fwd_update_priority); 205 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 206 if (write && ret == 0) 207 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE, 208 net); 209 210 return ret; 211 } 212 213 static int proc_tcp_congestion_control(const struct ctl_table *ctl, int write, 214 void *buffer, size_t *lenp, loff_t *ppos) 215 { 216 struct net *net = container_of(ctl->data, struct net, 217 ipv4.tcp_congestion_control); 218 char val[TCP_CA_NAME_MAX]; 219 struct ctl_table tbl = { 220 .data = val, 221 .maxlen = TCP_CA_NAME_MAX, 222 }; 223 int ret; 224 225 tcp_get_default_congestion_control(net, val); 226 227 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 228 if (write && ret == 0) 229 ret = tcp_set_default_congestion_control(net, val); 230 return ret; 231 } 232 233 static int proc_tcp_available_congestion_control(const struct ctl_table *ctl, 234 int write, void *buffer, 235 size_t *lenp, loff_t *ppos) 236 { 237 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, }; 238 int ret; 239 240 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 241 if (!tbl.data) 242 return -ENOMEM; 243 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX); 244 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 245 kfree(tbl.data); 246 return ret; 247 } 248 249 static int proc_allowed_congestion_control(const struct ctl_table *ctl, 250 int write, void *buffer, 251 size_t *lenp, loff_t *ppos) 252 { 253 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX }; 254 int ret; 255 256 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 257 if (!tbl.data) 258 return -ENOMEM; 259 260 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen); 261 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 262 if (write && ret == 0) 263 ret = tcp_set_allowed_congestion_control(tbl.data); 264 kfree(tbl.data); 265 return ret; 266 } 267 268 static int sscanf_key(char *buf, __le32 *key) 269 { 270 u32 user_key[4]; 271 int i, ret = 0; 272 273 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1, 274 user_key + 2, user_key + 3) != 4) { 275 ret = -EINVAL; 276 } else { 277 for (i = 0; i < ARRAY_SIZE(user_key); i++) 278 key[i] = cpu_to_le32(user_key[i]); 279 } 280 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n", 281 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret); 282 283 return ret; 284 } 285 286 static int proc_tcp_fastopen_key(const struct ctl_table *table, int write, 287 void *buffer, size_t *lenp, loff_t *ppos) 288 { 289 struct net *net = container_of(table->data, struct net, 290 ipv4.sysctl_tcp_fastopen); 291 /* maxlen to print the list of keys in hex (*2), with dashes 292 * separating doublewords and a comma in between keys. 293 */ 294 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 295 2 * TCP_FASTOPEN_KEY_MAX) + 296 (TCP_FASTOPEN_KEY_MAX * 5)) }; 297 u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)]; 298 __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)]; 299 char *backup_data; 300 int ret, i = 0, off = 0, n_keys; 301 302 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL); 303 if (!tbl.data) 304 return -ENOMEM; 305 306 n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key); 307 if (!n_keys) { 308 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH); 309 n_keys = 1; 310 } 311 312 for (i = 0; i < n_keys * 4; i++) 313 user_key[i] = le32_to_cpu(key[i]); 314 315 for (i = 0; i < n_keys; i++) { 316 off += snprintf(tbl.data + off, tbl.maxlen - off, 317 "%08x-%08x-%08x-%08x", 318 user_key[i * 4], 319 user_key[i * 4 + 1], 320 user_key[i * 4 + 2], 321 user_key[i * 4 + 3]); 322 323 if (WARN_ON_ONCE(off >= tbl.maxlen - 1)) 324 break; 325 326 if (i + 1 < n_keys) 327 off += snprintf(tbl.data + off, tbl.maxlen - off, ","); 328 } 329 330 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 331 332 if (write && ret == 0) { 333 backup_data = strchr(tbl.data, ','); 334 if (backup_data) { 335 *backup_data = '\0'; 336 backup_data++; 337 } 338 if (sscanf_key(tbl.data, key)) { 339 ret = -EINVAL; 340 goto bad_key; 341 } 342 if (backup_data) { 343 if (sscanf_key(backup_data, key + 4)) { 344 ret = -EINVAL; 345 goto bad_key; 346 } 347 } 348 tcp_fastopen_reset_cipher(net, NULL, key, 349 backup_data ? key + 4 : NULL); 350 } 351 352 bad_key: 353 kfree(tbl.data); 354 return ret; 355 } 356 357 static int proc_tfo_blackhole_detect_timeout(const struct ctl_table *table, 358 int write, void *buffer, 359 size_t *lenp, loff_t *ppos) 360 { 361 struct net *net = container_of(table->data, struct net, 362 ipv4.sysctl_tcp_fastopen_blackhole_timeout); 363 int ret; 364 365 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 366 if (write && ret == 0) 367 atomic_set(&net->ipv4.tfo_active_disable_times, 0); 368 369 return ret; 370 } 371 372 static int proc_tcp_available_ulp(const struct ctl_table *ctl, 373 int write, void *buffer, size_t *lenp, 374 loff_t *ppos) 375 { 376 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, }; 377 int ret; 378 379 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 380 if (!tbl.data) 381 return -ENOMEM; 382 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX); 383 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 384 kfree(tbl.data); 385 386 return ret; 387 } 388 389 static int proc_tcp_ehash_entries(const struct ctl_table *table, int write, 390 void *buffer, size_t *lenp, loff_t *ppos) 391 { 392 struct net *net = container_of(table->data, struct net, 393 ipv4.sysctl_tcp_child_ehash_entries); 394 struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo; 395 int tcp_ehash_entries; 396 struct ctl_table tbl; 397 398 tcp_ehash_entries = hinfo->ehash_mask + 1; 399 400 /* A negative number indicates that the child netns 401 * shares the global ehash. 402 */ 403 if (!net_eq(net, &init_net) && !hinfo->pernet) 404 tcp_ehash_entries *= -1; 405 406 memset(&tbl, 0, sizeof(tbl)); 407 tbl.data = &tcp_ehash_entries; 408 tbl.maxlen = sizeof(int); 409 410 return proc_dointvec(&tbl, write, buffer, lenp, ppos); 411 } 412 413 static int proc_udp_hash_entries(const struct ctl_table *table, int write, 414 void *buffer, size_t *lenp, loff_t *ppos) 415 { 416 struct net *net = container_of(table->data, struct net, 417 ipv4.sysctl_udp_child_hash_entries); 418 int udp_hash_entries; 419 struct ctl_table tbl; 420 421 udp_hash_entries = net->ipv4.udp_table->mask + 1; 422 423 /* A negative number indicates that the child netns 424 * shares the global udp_table. 425 */ 426 if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table) 427 udp_hash_entries *= -1; 428 429 memset(&tbl, 0, sizeof(tbl)); 430 tbl.data = &udp_hash_entries; 431 tbl.maxlen = sizeof(int); 432 433 return proc_dointvec(&tbl, write, buffer, lenp, ppos); 434 } 435 436 #ifdef CONFIG_IP_ROUTE_MULTIPATH 437 static int proc_fib_multipath_hash_policy(const struct ctl_table *table, int write, 438 void *buffer, size_t *lenp, 439 loff_t *ppos) 440 { 441 struct net *net = container_of(table->data, struct net, 442 ipv4.sysctl_fib_multipath_hash_policy); 443 int ret; 444 445 ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos); 446 if (write && ret == 0) 447 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 448 449 return ret; 450 } 451 452 static int proc_fib_multipath_hash_fields(const struct ctl_table *table, int write, 453 void *buffer, size_t *lenp, 454 loff_t *ppos) 455 { 456 struct net *net; 457 int ret; 458 459 net = container_of(table->data, struct net, 460 ipv4.sysctl_fib_multipath_hash_fields); 461 ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos); 462 if (write && ret == 0) 463 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 464 465 return ret; 466 } 467 468 static u32 proc_fib_multipath_hash_rand_seed __ro_after_init; 469 470 static void proc_fib_multipath_hash_init_rand_seed(void) 471 { 472 get_random_bytes(&proc_fib_multipath_hash_rand_seed, 473 sizeof(proc_fib_multipath_hash_rand_seed)); 474 } 475 476 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed) 477 { 478 struct sysctl_fib_multipath_hash_seed new = { 479 .user_seed = user_seed, 480 .mp_seed = (user_seed ? user_seed : 481 proc_fib_multipath_hash_rand_seed), 482 }; 483 484 WRITE_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed, new); 485 } 486 487 static int proc_fib_multipath_hash_seed(const struct ctl_table *table, int write, 488 void *buffer, size_t *lenp, 489 loff_t *ppos) 490 { 491 struct sysctl_fib_multipath_hash_seed *mphs; 492 struct net *net = table->data; 493 struct ctl_table tmp; 494 u32 user_seed; 495 int ret; 496 497 mphs = &net->ipv4.sysctl_fib_multipath_hash_seed; 498 user_seed = mphs->user_seed; 499 500 tmp = *table; 501 tmp.data = &user_seed; 502 503 ret = proc_douintvec_minmax(&tmp, write, buffer, lenp, ppos); 504 505 if (write && ret == 0) { 506 proc_fib_multipath_hash_set_seed(net, user_seed); 507 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 508 } 509 510 return ret; 511 } 512 #else 513 514 static void proc_fib_multipath_hash_init_rand_seed(void) 515 { 516 } 517 518 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed) 519 { 520 } 521 522 #endif 523 524 static struct ctl_table ipv4_table[] = { 525 { 526 .procname = "tcp_max_orphans", 527 .data = &sysctl_tcp_max_orphans, 528 .maxlen = sizeof(int), 529 .mode = 0644, 530 .proc_handler = proc_dointvec 531 }, 532 { 533 .procname = "inet_peer_threshold", 534 .data = &inet_peer_threshold, 535 .maxlen = sizeof(int), 536 .mode = 0644, 537 .proc_handler = proc_dointvec 538 }, 539 { 540 .procname = "inet_peer_minttl", 541 .data = &inet_peer_minttl, 542 .maxlen = sizeof(int), 543 .mode = 0644, 544 .proc_handler = proc_dointvec_jiffies, 545 }, 546 { 547 .procname = "inet_peer_maxttl", 548 .data = &inet_peer_maxttl, 549 .maxlen = sizeof(int), 550 .mode = 0644, 551 .proc_handler = proc_dointvec_jiffies, 552 }, 553 { 554 .procname = "tcp_mem", 555 .maxlen = sizeof(sysctl_tcp_mem), 556 .data = &sysctl_tcp_mem, 557 .mode = 0644, 558 .proc_handler = proc_doulongvec_minmax, 559 }, 560 { 561 .procname = "tcp_low_latency", 562 .data = &sysctl_tcp_low_latency, 563 .maxlen = sizeof(int), 564 .mode = 0644, 565 .proc_handler = proc_dointvec 566 }, 567 #ifdef CONFIG_NETLABEL 568 { 569 .procname = "cipso_cache_enable", 570 .data = &cipso_v4_cache_enabled, 571 .maxlen = sizeof(int), 572 .mode = 0644, 573 .proc_handler = proc_dointvec, 574 }, 575 { 576 .procname = "cipso_cache_bucket_size", 577 .data = &cipso_v4_cache_bucketsize, 578 .maxlen = sizeof(int), 579 .mode = 0644, 580 .proc_handler = proc_dointvec, 581 }, 582 { 583 .procname = "cipso_rbm_optfmt", 584 .data = &cipso_v4_rbm_optfmt, 585 .maxlen = sizeof(int), 586 .mode = 0644, 587 .proc_handler = proc_dointvec, 588 }, 589 { 590 .procname = "cipso_rbm_strictvalid", 591 .data = &cipso_v4_rbm_strictvalid, 592 .maxlen = sizeof(int), 593 .mode = 0644, 594 .proc_handler = proc_dointvec, 595 }, 596 #endif /* CONFIG_NETLABEL */ 597 { 598 .procname = "tcp_available_ulp", 599 .maxlen = TCP_ULP_BUF_MAX, 600 .mode = 0444, 601 .proc_handler = proc_tcp_available_ulp, 602 }, 603 { 604 .procname = "icmp_msgs_per_sec", 605 .data = &sysctl_icmp_msgs_per_sec, 606 .maxlen = sizeof(int), 607 .mode = 0644, 608 .proc_handler = proc_dointvec_minmax, 609 .extra1 = SYSCTL_ZERO, 610 }, 611 { 612 .procname = "icmp_msgs_burst", 613 .data = &sysctl_icmp_msgs_burst, 614 .maxlen = sizeof(int), 615 .mode = 0644, 616 .proc_handler = proc_dointvec_minmax, 617 .extra1 = SYSCTL_ZERO, 618 }, 619 { 620 .procname = "udp_mem", 621 .data = &sysctl_udp_mem, 622 .maxlen = sizeof(sysctl_udp_mem), 623 .mode = 0644, 624 .proc_handler = proc_doulongvec_minmax, 625 }, 626 { 627 .procname = "fib_sync_mem", 628 .data = &sysctl_fib_sync_mem, 629 .maxlen = sizeof(sysctl_fib_sync_mem), 630 .mode = 0644, 631 .proc_handler = proc_douintvec_minmax, 632 .extra1 = &sysctl_fib_sync_mem_min, 633 .extra2 = &sysctl_fib_sync_mem_max, 634 }, 635 }; 636 637 static struct ctl_table ipv4_net_table[] = { 638 { 639 .procname = "tcp_max_tw_buckets", 640 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, 641 .maxlen = sizeof(int), 642 .mode = 0644, 643 .proc_handler = proc_dointvec 644 }, 645 { 646 .procname = "icmp_echo_ignore_all", 647 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, 648 .maxlen = sizeof(u8), 649 .mode = 0644, 650 .proc_handler = proc_dou8vec_minmax, 651 .extra1 = SYSCTL_ZERO, 652 .extra2 = SYSCTL_ONE 653 }, 654 { 655 .procname = "icmp_echo_enable_probe", 656 .data = &init_net.ipv4.sysctl_icmp_echo_enable_probe, 657 .maxlen = sizeof(u8), 658 .mode = 0644, 659 .proc_handler = proc_dou8vec_minmax, 660 .extra1 = SYSCTL_ZERO, 661 .extra2 = SYSCTL_ONE 662 }, 663 { 664 .procname = "icmp_echo_ignore_broadcasts", 665 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, 666 .maxlen = sizeof(u8), 667 .mode = 0644, 668 .proc_handler = proc_dou8vec_minmax, 669 .extra1 = SYSCTL_ZERO, 670 .extra2 = SYSCTL_ONE 671 }, 672 { 673 .procname = "icmp_ignore_bogus_error_responses", 674 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, 675 .maxlen = sizeof(u8), 676 .mode = 0644, 677 .proc_handler = proc_dou8vec_minmax, 678 .extra1 = SYSCTL_ZERO, 679 .extra2 = SYSCTL_ONE 680 }, 681 { 682 .procname = "icmp_errors_use_inbound_ifaddr", 683 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, 684 .maxlen = sizeof(u8), 685 .mode = 0644, 686 .proc_handler = proc_dou8vec_minmax, 687 .extra1 = SYSCTL_ZERO, 688 .extra2 = SYSCTL_ONE 689 }, 690 { 691 .procname = "icmp_ratelimit", 692 .data = &init_net.ipv4.sysctl_icmp_ratelimit, 693 .maxlen = sizeof(int), 694 .mode = 0644, 695 .proc_handler = proc_dointvec_ms_jiffies, 696 }, 697 { 698 .procname = "icmp_ratemask", 699 .data = &init_net.ipv4.sysctl_icmp_ratemask, 700 .maxlen = sizeof(int), 701 .mode = 0644, 702 .proc_handler = proc_dointvec 703 }, 704 { 705 .procname = "ping_group_range", 706 .data = &init_net.ipv4.ping_group_range.range, 707 .maxlen = sizeof(gid_t)*2, 708 .mode = 0644, 709 .proc_handler = ipv4_ping_group_range, 710 }, 711 #ifdef CONFIG_NET_L3_MASTER_DEV 712 { 713 .procname = "raw_l3mdev_accept", 714 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept, 715 .maxlen = sizeof(u8), 716 .mode = 0644, 717 .proc_handler = proc_dou8vec_minmax, 718 .extra1 = SYSCTL_ZERO, 719 .extra2 = SYSCTL_ONE, 720 }, 721 #endif 722 { 723 .procname = "tcp_ecn", 724 .data = &init_net.ipv4.sysctl_tcp_ecn, 725 .maxlen = sizeof(u8), 726 .mode = 0644, 727 .proc_handler = proc_dou8vec_minmax, 728 .extra1 = SYSCTL_ZERO, 729 .extra2 = SYSCTL_TWO, 730 }, 731 { 732 .procname = "tcp_ecn_fallback", 733 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback, 734 .maxlen = sizeof(u8), 735 .mode = 0644, 736 .proc_handler = proc_dou8vec_minmax, 737 .extra1 = SYSCTL_ZERO, 738 .extra2 = SYSCTL_ONE, 739 }, 740 { 741 .procname = "ip_dynaddr", 742 .data = &init_net.ipv4.sysctl_ip_dynaddr, 743 .maxlen = sizeof(u8), 744 .mode = 0644, 745 .proc_handler = proc_dou8vec_minmax, 746 }, 747 { 748 .procname = "ip_early_demux", 749 .data = &init_net.ipv4.sysctl_ip_early_demux, 750 .maxlen = sizeof(u8), 751 .mode = 0644, 752 .proc_handler = proc_dou8vec_minmax, 753 }, 754 { 755 .procname = "udp_early_demux", 756 .data = &init_net.ipv4.sysctl_udp_early_demux, 757 .maxlen = sizeof(u8), 758 .mode = 0644, 759 .proc_handler = proc_dou8vec_minmax, 760 }, 761 { 762 .procname = "tcp_early_demux", 763 .data = &init_net.ipv4.sysctl_tcp_early_demux, 764 .maxlen = sizeof(u8), 765 .mode = 0644, 766 .proc_handler = proc_dou8vec_minmax, 767 }, 768 { 769 .procname = "nexthop_compat_mode", 770 .data = &init_net.ipv4.sysctl_nexthop_compat_mode, 771 .maxlen = sizeof(u8), 772 .mode = 0644, 773 .proc_handler = proc_dou8vec_minmax, 774 .extra1 = SYSCTL_ZERO, 775 .extra2 = SYSCTL_ONE, 776 }, 777 { 778 .procname = "ip_default_ttl", 779 .data = &init_net.ipv4.sysctl_ip_default_ttl, 780 .maxlen = sizeof(u8), 781 .mode = 0644, 782 .proc_handler = proc_dou8vec_minmax, 783 .extra1 = &ip_ttl_min, 784 .extra2 = &ip_ttl_max, 785 }, 786 { 787 .procname = "ip_local_port_range", 788 .maxlen = 0, 789 .data = &init_net, 790 .mode = 0644, 791 .proc_handler = ipv4_local_port_range, 792 }, 793 { 794 .procname = "ip_local_reserved_ports", 795 .data = &init_net.ipv4.sysctl_local_reserved_ports, 796 .maxlen = 65536, 797 .mode = 0644, 798 .proc_handler = proc_do_large_bitmap, 799 }, 800 { 801 .procname = "ip_no_pmtu_disc", 802 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc, 803 .maxlen = sizeof(u8), 804 .mode = 0644, 805 .proc_handler = proc_dou8vec_minmax, 806 }, 807 { 808 .procname = "ip_forward_use_pmtu", 809 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu, 810 .maxlen = sizeof(u8), 811 .mode = 0644, 812 .proc_handler = proc_dou8vec_minmax, 813 }, 814 { 815 .procname = "ip_forward_update_priority", 816 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority, 817 .maxlen = sizeof(u8), 818 .mode = 0644, 819 .proc_handler = ipv4_fwd_update_priority, 820 .extra1 = SYSCTL_ZERO, 821 .extra2 = SYSCTL_ONE, 822 }, 823 { 824 .procname = "ip_nonlocal_bind", 825 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind, 826 .maxlen = sizeof(u8), 827 .mode = 0644, 828 .proc_handler = proc_dou8vec_minmax, 829 }, 830 { 831 .procname = "ip_autobind_reuse", 832 .data = &init_net.ipv4.sysctl_ip_autobind_reuse, 833 .maxlen = sizeof(u8), 834 .mode = 0644, 835 .proc_handler = proc_dou8vec_minmax, 836 .extra1 = SYSCTL_ZERO, 837 .extra2 = SYSCTL_ONE, 838 }, 839 { 840 .procname = "fwmark_reflect", 841 .data = &init_net.ipv4.sysctl_fwmark_reflect, 842 .maxlen = sizeof(u8), 843 .mode = 0644, 844 .proc_handler = proc_dou8vec_minmax, 845 }, 846 { 847 .procname = "tcp_fwmark_accept", 848 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept, 849 .maxlen = sizeof(u8), 850 .mode = 0644, 851 .proc_handler = proc_dou8vec_minmax, 852 }, 853 #ifdef CONFIG_NET_L3_MASTER_DEV 854 { 855 .procname = "tcp_l3mdev_accept", 856 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept, 857 .maxlen = sizeof(u8), 858 .mode = 0644, 859 .proc_handler = proc_dou8vec_minmax, 860 .extra1 = SYSCTL_ZERO, 861 .extra2 = SYSCTL_ONE, 862 }, 863 #endif 864 { 865 .procname = "tcp_mtu_probing", 866 .data = &init_net.ipv4.sysctl_tcp_mtu_probing, 867 .maxlen = sizeof(u8), 868 .mode = 0644, 869 .proc_handler = proc_dou8vec_minmax, 870 }, 871 { 872 .procname = "tcp_base_mss", 873 .data = &init_net.ipv4.sysctl_tcp_base_mss, 874 .maxlen = sizeof(int), 875 .mode = 0644, 876 .proc_handler = proc_dointvec, 877 }, 878 { 879 .procname = "tcp_min_snd_mss", 880 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss, 881 .maxlen = sizeof(int), 882 .mode = 0644, 883 .proc_handler = proc_dointvec_minmax, 884 .extra1 = &tcp_min_snd_mss_min, 885 .extra2 = &tcp_min_snd_mss_max, 886 }, 887 { 888 .procname = "tcp_mtu_probe_floor", 889 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor, 890 .maxlen = sizeof(int), 891 .mode = 0644, 892 .proc_handler = proc_dointvec_minmax, 893 .extra1 = &tcp_min_snd_mss_min, 894 .extra2 = &tcp_min_snd_mss_max, 895 }, 896 { 897 .procname = "tcp_probe_threshold", 898 .data = &init_net.ipv4.sysctl_tcp_probe_threshold, 899 .maxlen = sizeof(int), 900 .mode = 0644, 901 .proc_handler = proc_dointvec, 902 }, 903 { 904 .procname = "tcp_probe_interval", 905 .data = &init_net.ipv4.sysctl_tcp_probe_interval, 906 .maxlen = sizeof(u32), 907 .mode = 0644, 908 .proc_handler = proc_douintvec_minmax, 909 .extra2 = &u32_max_div_HZ, 910 }, 911 { 912 .procname = "igmp_link_local_mcast_reports", 913 .data = &init_net.ipv4.sysctl_igmp_llm_reports, 914 .maxlen = sizeof(u8), 915 .mode = 0644, 916 .proc_handler = proc_dou8vec_minmax, 917 }, 918 { 919 .procname = "igmp_max_memberships", 920 .data = &init_net.ipv4.sysctl_igmp_max_memberships, 921 .maxlen = sizeof(int), 922 .mode = 0644, 923 .proc_handler = proc_dointvec 924 }, 925 { 926 .procname = "igmp_max_msf", 927 .data = &init_net.ipv4.sysctl_igmp_max_msf, 928 .maxlen = sizeof(int), 929 .mode = 0644, 930 .proc_handler = proc_dointvec 931 }, 932 #ifdef CONFIG_IP_MULTICAST 933 { 934 .procname = "igmp_qrv", 935 .data = &init_net.ipv4.sysctl_igmp_qrv, 936 .maxlen = sizeof(int), 937 .mode = 0644, 938 .proc_handler = proc_dointvec_minmax, 939 .extra1 = SYSCTL_ONE 940 }, 941 #endif 942 { 943 .procname = "tcp_congestion_control", 944 .data = &init_net.ipv4.tcp_congestion_control, 945 .mode = 0644, 946 .maxlen = TCP_CA_NAME_MAX, 947 .proc_handler = proc_tcp_congestion_control, 948 }, 949 { 950 .procname = "tcp_available_congestion_control", 951 .maxlen = TCP_CA_BUF_MAX, 952 .mode = 0444, 953 .proc_handler = proc_tcp_available_congestion_control, 954 }, 955 { 956 .procname = "tcp_allowed_congestion_control", 957 .maxlen = TCP_CA_BUF_MAX, 958 .mode = 0644, 959 .proc_handler = proc_allowed_congestion_control, 960 }, 961 { 962 .procname = "tcp_keepalive_time", 963 .data = &init_net.ipv4.sysctl_tcp_keepalive_time, 964 .maxlen = sizeof(int), 965 .mode = 0644, 966 .proc_handler = proc_dointvec_jiffies, 967 }, 968 { 969 .procname = "tcp_keepalive_probes", 970 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes, 971 .maxlen = sizeof(u8), 972 .mode = 0644, 973 .proc_handler = proc_dou8vec_minmax, 974 }, 975 { 976 .procname = "tcp_keepalive_intvl", 977 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl, 978 .maxlen = sizeof(int), 979 .mode = 0644, 980 .proc_handler = proc_dointvec_jiffies, 981 }, 982 { 983 .procname = "tcp_syn_retries", 984 .data = &init_net.ipv4.sysctl_tcp_syn_retries, 985 .maxlen = sizeof(u8), 986 .mode = 0644, 987 .proc_handler = proc_dou8vec_minmax, 988 .extra1 = &tcp_syn_retries_min, 989 .extra2 = &tcp_syn_retries_max 990 }, 991 { 992 .procname = "tcp_synack_retries", 993 .data = &init_net.ipv4.sysctl_tcp_synack_retries, 994 .maxlen = sizeof(u8), 995 .mode = 0644, 996 .proc_handler = proc_dou8vec_minmax, 997 }, 998 #ifdef CONFIG_SYN_COOKIES 999 { 1000 .procname = "tcp_syncookies", 1001 .data = &init_net.ipv4.sysctl_tcp_syncookies, 1002 .maxlen = sizeof(u8), 1003 .mode = 0644, 1004 .proc_handler = proc_dou8vec_minmax, 1005 }, 1006 #endif 1007 { 1008 .procname = "tcp_migrate_req", 1009 .data = &init_net.ipv4.sysctl_tcp_migrate_req, 1010 .maxlen = sizeof(u8), 1011 .mode = 0644, 1012 .proc_handler = proc_dou8vec_minmax, 1013 .extra1 = SYSCTL_ZERO, 1014 .extra2 = SYSCTL_ONE 1015 }, 1016 { 1017 .procname = "tcp_reordering", 1018 .data = &init_net.ipv4.sysctl_tcp_reordering, 1019 .maxlen = sizeof(int), 1020 .mode = 0644, 1021 .proc_handler = proc_dointvec 1022 }, 1023 { 1024 .procname = "tcp_retries1", 1025 .data = &init_net.ipv4.sysctl_tcp_retries1, 1026 .maxlen = sizeof(u8), 1027 .mode = 0644, 1028 .proc_handler = proc_dou8vec_minmax, 1029 .extra2 = &tcp_retr1_max 1030 }, 1031 { 1032 .procname = "tcp_retries2", 1033 .data = &init_net.ipv4.sysctl_tcp_retries2, 1034 .maxlen = sizeof(u8), 1035 .mode = 0644, 1036 .proc_handler = proc_dou8vec_minmax, 1037 }, 1038 { 1039 .procname = "tcp_orphan_retries", 1040 .data = &init_net.ipv4.sysctl_tcp_orphan_retries, 1041 .maxlen = sizeof(u8), 1042 .mode = 0644, 1043 .proc_handler = proc_dou8vec_minmax, 1044 }, 1045 { 1046 .procname = "tcp_fin_timeout", 1047 .data = &init_net.ipv4.sysctl_tcp_fin_timeout, 1048 .maxlen = sizeof(int), 1049 .mode = 0644, 1050 .proc_handler = proc_dointvec_jiffies, 1051 }, 1052 { 1053 .procname = "tcp_notsent_lowat", 1054 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat, 1055 .maxlen = sizeof(unsigned int), 1056 .mode = 0644, 1057 .proc_handler = proc_douintvec, 1058 }, 1059 { 1060 .procname = "tcp_tw_reuse", 1061 .data = &init_net.ipv4.sysctl_tcp_tw_reuse, 1062 .maxlen = sizeof(u8), 1063 .mode = 0644, 1064 .proc_handler = proc_dou8vec_minmax, 1065 .extra1 = SYSCTL_ZERO, 1066 .extra2 = SYSCTL_TWO, 1067 }, 1068 { 1069 .procname = "tcp_max_syn_backlog", 1070 .data = &init_net.ipv4.sysctl_max_syn_backlog, 1071 .maxlen = sizeof(int), 1072 .mode = 0644, 1073 .proc_handler = proc_dointvec 1074 }, 1075 { 1076 .procname = "tcp_fastopen", 1077 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1078 .maxlen = sizeof(int), 1079 .mode = 0644, 1080 .proc_handler = proc_dointvec, 1081 }, 1082 { 1083 .procname = "tcp_fastopen_key", 1084 .mode = 0600, 1085 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1086 /* maxlen to print the list of keys in hex (*2), with dashes 1087 * separating doublewords and a comma in between keys. 1088 */ 1089 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 1090 2 * TCP_FASTOPEN_KEY_MAX) + 1091 (TCP_FASTOPEN_KEY_MAX * 5)), 1092 .proc_handler = proc_tcp_fastopen_key, 1093 }, 1094 { 1095 .procname = "tcp_fastopen_blackhole_timeout_sec", 1096 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout, 1097 .maxlen = sizeof(int), 1098 .mode = 0644, 1099 .proc_handler = proc_tfo_blackhole_detect_timeout, 1100 .extra1 = SYSCTL_ZERO, 1101 }, 1102 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1103 { 1104 .procname = "fib_multipath_use_neigh", 1105 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh, 1106 .maxlen = sizeof(u8), 1107 .mode = 0644, 1108 .proc_handler = proc_dou8vec_minmax, 1109 .extra1 = SYSCTL_ZERO, 1110 .extra2 = SYSCTL_ONE, 1111 }, 1112 { 1113 .procname = "fib_multipath_hash_policy", 1114 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy, 1115 .maxlen = sizeof(u8), 1116 .mode = 0644, 1117 .proc_handler = proc_fib_multipath_hash_policy, 1118 .extra1 = SYSCTL_ZERO, 1119 .extra2 = SYSCTL_THREE, 1120 }, 1121 { 1122 .procname = "fib_multipath_hash_fields", 1123 .data = &init_net.ipv4.sysctl_fib_multipath_hash_fields, 1124 .maxlen = sizeof(u32), 1125 .mode = 0644, 1126 .proc_handler = proc_fib_multipath_hash_fields, 1127 .extra1 = SYSCTL_ONE, 1128 .extra2 = &fib_multipath_hash_fields_all_mask, 1129 }, 1130 { 1131 .procname = "fib_multipath_hash_seed", 1132 .data = &init_net, 1133 .maxlen = sizeof(u32), 1134 .mode = 0644, 1135 .proc_handler = proc_fib_multipath_hash_seed, 1136 }, 1137 #endif 1138 { 1139 .procname = "ip_unprivileged_port_start", 1140 .maxlen = sizeof(int), 1141 .data = &init_net.ipv4.sysctl_ip_prot_sock, 1142 .mode = 0644, 1143 .proc_handler = ipv4_privileged_ports, 1144 }, 1145 #ifdef CONFIG_NET_L3_MASTER_DEV 1146 { 1147 .procname = "udp_l3mdev_accept", 1148 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept, 1149 .maxlen = sizeof(u8), 1150 .mode = 0644, 1151 .proc_handler = proc_dou8vec_minmax, 1152 .extra1 = SYSCTL_ZERO, 1153 .extra2 = SYSCTL_ONE, 1154 }, 1155 #endif 1156 { 1157 .procname = "tcp_sack", 1158 .data = &init_net.ipv4.sysctl_tcp_sack, 1159 .maxlen = sizeof(u8), 1160 .mode = 0644, 1161 .proc_handler = proc_dou8vec_minmax, 1162 }, 1163 { 1164 .procname = "tcp_window_scaling", 1165 .data = &init_net.ipv4.sysctl_tcp_window_scaling, 1166 .maxlen = sizeof(u8), 1167 .mode = 0644, 1168 .proc_handler = proc_dou8vec_minmax, 1169 }, 1170 { 1171 .procname = "tcp_timestamps", 1172 .data = &init_net.ipv4.sysctl_tcp_timestamps, 1173 .maxlen = sizeof(u8), 1174 .mode = 0644, 1175 .proc_handler = proc_dou8vec_minmax, 1176 }, 1177 { 1178 .procname = "tcp_early_retrans", 1179 .data = &init_net.ipv4.sysctl_tcp_early_retrans, 1180 .maxlen = sizeof(u8), 1181 .mode = 0644, 1182 .proc_handler = proc_dou8vec_minmax, 1183 .extra1 = SYSCTL_ZERO, 1184 .extra2 = SYSCTL_FOUR, 1185 }, 1186 { 1187 .procname = "tcp_recovery", 1188 .data = &init_net.ipv4.sysctl_tcp_recovery, 1189 .maxlen = sizeof(u8), 1190 .mode = 0644, 1191 .proc_handler = proc_dou8vec_minmax, 1192 }, 1193 { 1194 .procname = "tcp_thin_linear_timeouts", 1195 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts, 1196 .maxlen = sizeof(u8), 1197 .mode = 0644, 1198 .proc_handler = proc_dou8vec_minmax, 1199 }, 1200 { 1201 .procname = "tcp_slow_start_after_idle", 1202 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle, 1203 .maxlen = sizeof(u8), 1204 .mode = 0644, 1205 .proc_handler = proc_dou8vec_minmax, 1206 }, 1207 { 1208 .procname = "tcp_retrans_collapse", 1209 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse, 1210 .maxlen = sizeof(u8), 1211 .mode = 0644, 1212 .proc_handler = proc_dou8vec_minmax, 1213 }, 1214 { 1215 .procname = "tcp_stdurg", 1216 .data = &init_net.ipv4.sysctl_tcp_stdurg, 1217 .maxlen = sizeof(u8), 1218 .mode = 0644, 1219 .proc_handler = proc_dou8vec_minmax, 1220 }, 1221 { 1222 .procname = "tcp_rfc1337", 1223 .data = &init_net.ipv4.sysctl_tcp_rfc1337, 1224 .maxlen = sizeof(u8), 1225 .mode = 0644, 1226 .proc_handler = proc_dou8vec_minmax, 1227 }, 1228 { 1229 .procname = "tcp_abort_on_overflow", 1230 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow, 1231 .maxlen = sizeof(u8), 1232 .mode = 0644, 1233 .proc_handler = proc_dou8vec_minmax, 1234 }, 1235 { 1236 .procname = "tcp_fack", 1237 .data = &init_net.ipv4.sysctl_tcp_fack, 1238 .maxlen = sizeof(u8), 1239 .mode = 0644, 1240 .proc_handler = proc_dou8vec_minmax, 1241 }, 1242 { 1243 .procname = "tcp_max_reordering", 1244 .data = &init_net.ipv4.sysctl_tcp_max_reordering, 1245 .maxlen = sizeof(int), 1246 .mode = 0644, 1247 .proc_handler = proc_dointvec 1248 }, 1249 { 1250 .procname = "tcp_dsack", 1251 .data = &init_net.ipv4.sysctl_tcp_dsack, 1252 .maxlen = sizeof(u8), 1253 .mode = 0644, 1254 .proc_handler = proc_dou8vec_minmax, 1255 }, 1256 { 1257 .procname = "tcp_app_win", 1258 .data = &init_net.ipv4.sysctl_tcp_app_win, 1259 .maxlen = sizeof(u8), 1260 .mode = 0644, 1261 .proc_handler = proc_dou8vec_minmax, 1262 .extra1 = SYSCTL_ZERO, 1263 .extra2 = &tcp_app_win_max, 1264 }, 1265 { 1266 .procname = "tcp_adv_win_scale", 1267 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale, 1268 .maxlen = sizeof(int), 1269 .mode = 0644, 1270 .proc_handler = proc_dointvec_minmax, 1271 .extra1 = &tcp_adv_win_scale_min, 1272 .extra2 = &tcp_adv_win_scale_max, 1273 }, 1274 { 1275 .procname = "tcp_frto", 1276 .data = &init_net.ipv4.sysctl_tcp_frto, 1277 .maxlen = sizeof(u8), 1278 .mode = 0644, 1279 .proc_handler = proc_dou8vec_minmax, 1280 }, 1281 { 1282 .procname = "tcp_no_metrics_save", 1283 .data = &init_net.ipv4.sysctl_tcp_nometrics_save, 1284 .maxlen = sizeof(u8), 1285 .mode = 0644, 1286 .proc_handler = proc_dou8vec_minmax, 1287 }, 1288 { 1289 .procname = "tcp_no_ssthresh_metrics_save", 1290 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save, 1291 .maxlen = sizeof(u8), 1292 .mode = 0644, 1293 .proc_handler = proc_dou8vec_minmax, 1294 .extra1 = SYSCTL_ZERO, 1295 .extra2 = SYSCTL_ONE, 1296 }, 1297 { 1298 .procname = "tcp_moderate_rcvbuf", 1299 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf, 1300 .maxlen = sizeof(u8), 1301 .mode = 0644, 1302 .proc_handler = proc_dou8vec_minmax, 1303 }, 1304 { 1305 .procname = "tcp_tso_win_divisor", 1306 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor, 1307 .maxlen = sizeof(u8), 1308 .mode = 0644, 1309 .proc_handler = proc_dou8vec_minmax, 1310 }, 1311 { 1312 .procname = "tcp_workaround_signed_windows", 1313 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows, 1314 .maxlen = sizeof(u8), 1315 .mode = 0644, 1316 .proc_handler = proc_dou8vec_minmax, 1317 }, 1318 { 1319 .procname = "tcp_limit_output_bytes", 1320 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes, 1321 .maxlen = sizeof(int), 1322 .mode = 0644, 1323 .proc_handler = proc_dointvec 1324 }, 1325 { 1326 .procname = "tcp_challenge_ack_limit", 1327 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit, 1328 .maxlen = sizeof(int), 1329 .mode = 0644, 1330 .proc_handler = proc_dointvec 1331 }, 1332 { 1333 .procname = "tcp_min_tso_segs", 1334 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs, 1335 .maxlen = sizeof(u8), 1336 .mode = 0644, 1337 .proc_handler = proc_dou8vec_minmax, 1338 .extra1 = SYSCTL_ONE, 1339 }, 1340 { 1341 .procname = "tcp_tso_rtt_log", 1342 .data = &init_net.ipv4.sysctl_tcp_tso_rtt_log, 1343 .maxlen = sizeof(u8), 1344 .mode = 0644, 1345 .proc_handler = proc_dou8vec_minmax, 1346 }, 1347 { 1348 .procname = "tcp_min_rtt_wlen", 1349 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen, 1350 .maxlen = sizeof(int), 1351 .mode = 0644, 1352 .proc_handler = proc_dointvec_minmax, 1353 .extra1 = SYSCTL_ZERO, 1354 .extra2 = &one_day_secs 1355 }, 1356 { 1357 .procname = "tcp_autocorking", 1358 .data = &init_net.ipv4.sysctl_tcp_autocorking, 1359 .maxlen = sizeof(u8), 1360 .mode = 0644, 1361 .proc_handler = proc_dou8vec_minmax, 1362 .extra1 = SYSCTL_ZERO, 1363 .extra2 = SYSCTL_ONE, 1364 }, 1365 { 1366 .procname = "tcp_invalid_ratelimit", 1367 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit, 1368 .maxlen = sizeof(int), 1369 .mode = 0644, 1370 .proc_handler = proc_dointvec_ms_jiffies, 1371 }, 1372 { 1373 .procname = "tcp_pacing_ss_ratio", 1374 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio, 1375 .maxlen = sizeof(int), 1376 .mode = 0644, 1377 .proc_handler = proc_dointvec_minmax, 1378 .extra1 = SYSCTL_ZERO, 1379 .extra2 = SYSCTL_ONE_THOUSAND, 1380 }, 1381 { 1382 .procname = "tcp_pacing_ca_ratio", 1383 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio, 1384 .maxlen = sizeof(int), 1385 .mode = 0644, 1386 .proc_handler = proc_dointvec_minmax, 1387 .extra1 = SYSCTL_ZERO, 1388 .extra2 = SYSCTL_ONE_THOUSAND, 1389 }, 1390 { 1391 .procname = "tcp_wmem", 1392 .data = &init_net.ipv4.sysctl_tcp_wmem, 1393 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem), 1394 .mode = 0644, 1395 .proc_handler = proc_dointvec_minmax, 1396 .extra1 = SYSCTL_ONE, 1397 }, 1398 { 1399 .procname = "tcp_rmem", 1400 .data = &init_net.ipv4.sysctl_tcp_rmem, 1401 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem), 1402 .mode = 0644, 1403 .proc_handler = proc_dointvec_minmax, 1404 .extra1 = SYSCTL_ONE, 1405 }, 1406 { 1407 .procname = "tcp_comp_sack_delay_ns", 1408 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns, 1409 .maxlen = sizeof(unsigned long), 1410 .mode = 0644, 1411 .proc_handler = proc_doulongvec_minmax, 1412 }, 1413 { 1414 .procname = "tcp_comp_sack_slack_ns", 1415 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns, 1416 .maxlen = sizeof(unsigned long), 1417 .mode = 0644, 1418 .proc_handler = proc_doulongvec_minmax, 1419 }, 1420 { 1421 .procname = "tcp_comp_sack_nr", 1422 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr, 1423 .maxlen = sizeof(u8), 1424 .mode = 0644, 1425 .proc_handler = proc_dou8vec_minmax, 1426 .extra1 = SYSCTL_ZERO, 1427 }, 1428 { 1429 .procname = "tcp_backlog_ack_defer", 1430 .data = &init_net.ipv4.sysctl_tcp_backlog_ack_defer, 1431 .maxlen = sizeof(u8), 1432 .mode = 0644, 1433 .proc_handler = proc_dou8vec_minmax, 1434 .extra1 = SYSCTL_ZERO, 1435 .extra2 = SYSCTL_ONE, 1436 }, 1437 { 1438 .procname = "tcp_reflect_tos", 1439 .data = &init_net.ipv4.sysctl_tcp_reflect_tos, 1440 .maxlen = sizeof(u8), 1441 .mode = 0644, 1442 .proc_handler = proc_dou8vec_minmax, 1443 .extra1 = SYSCTL_ZERO, 1444 .extra2 = SYSCTL_ONE, 1445 }, 1446 { 1447 .procname = "tcp_ehash_entries", 1448 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries, 1449 .mode = 0444, 1450 .proc_handler = proc_tcp_ehash_entries, 1451 }, 1452 { 1453 .procname = "tcp_child_ehash_entries", 1454 .data = &init_net.ipv4.sysctl_tcp_child_ehash_entries, 1455 .maxlen = sizeof(unsigned int), 1456 .mode = 0644, 1457 .proc_handler = proc_douintvec_minmax, 1458 .extra1 = SYSCTL_ZERO, 1459 .extra2 = &tcp_child_ehash_entries_max, 1460 }, 1461 { 1462 .procname = "udp_hash_entries", 1463 .data = &init_net.ipv4.sysctl_udp_child_hash_entries, 1464 .mode = 0444, 1465 .proc_handler = proc_udp_hash_entries, 1466 }, 1467 { 1468 .procname = "udp_child_hash_entries", 1469 .data = &init_net.ipv4.sysctl_udp_child_hash_entries, 1470 .maxlen = sizeof(unsigned int), 1471 .mode = 0644, 1472 .proc_handler = proc_douintvec_minmax, 1473 .extra1 = SYSCTL_ZERO, 1474 .extra2 = &udp_child_hash_entries_max, 1475 }, 1476 { 1477 .procname = "udp_rmem_min", 1478 .data = &init_net.ipv4.sysctl_udp_rmem_min, 1479 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min), 1480 .mode = 0644, 1481 .proc_handler = proc_dointvec_minmax, 1482 .extra1 = SYSCTL_ONE 1483 }, 1484 { 1485 .procname = "udp_wmem_min", 1486 .data = &init_net.ipv4.sysctl_udp_wmem_min, 1487 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min), 1488 .mode = 0644, 1489 .proc_handler = proc_dointvec_minmax, 1490 .extra1 = SYSCTL_ONE 1491 }, 1492 { 1493 .procname = "fib_notify_on_flag_change", 1494 .data = &init_net.ipv4.sysctl_fib_notify_on_flag_change, 1495 .maxlen = sizeof(u8), 1496 .mode = 0644, 1497 .proc_handler = proc_dou8vec_minmax, 1498 .extra1 = SYSCTL_ZERO, 1499 .extra2 = SYSCTL_TWO, 1500 }, 1501 { 1502 .procname = "tcp_plb_enabled", 1503 .data = &init_net.ipv4.sysctl_tcp_plb_enabled, 1504 .maxlen = sizeof(u8), 1505 .mode = 0644, 1506 .proc_handler = proc_dou8vec_minmax, 1507 .extra1 = SYSCTL_ZERO, 1508 .extra2 = SYSCTL_ONE, 1509 }, 1510 { 1511 .procname = "tcp_plb_idle_rehash_rounds", 1512 .data = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds, 1513 .maxlen = sizeof(u8), 1514 .mode = 0644, 1515 .proc_handler = proc_dou8vec_minmax, 1516 .extra2 = &tcp_plb_max_rounds, 1517 }, 1518 { 1519 .procname = "tcp_plb_rehash_rounds", 1520 .data = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds, 1521 .maxlen = sizeof(u8), 1522 .mode = 0644, 1523 .proc_handler = proc_dou8vec_minmax, 1524 .extra2 = &tcp_plb_max_rounds, 1525 }, 1526 { 1527 .procname = "tcp_plb_suspend_rto_sec", 1528 .data = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec, 1529 .maxlen = sizeof(u8), 1530 .mode = 0644, 1531 .proc_handler = proc_dou8vec_minmax, 1532 }, 1533 { 1534 .procname = "tcp_plb_cong_thresh", 1535 .data = &init_net.ipv4.sysctl_tcp_plb_cong_thresh, 1536 .maxlen = sizeof(int), 1537 .mode = 0644, 1538 .proc_handler = proc_dointvec_minmax, 1539 .extra1 = SYSCTL_ZERO, 1540 .extra2 = &tcp_plb_max_cong_thresh, 1541 }, 1542 { 1543 .procname = "tcp_syn_linear_timeouts", 1544 .data = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts, 1545 .maxlen = sizeof(u8), 1546 .mode = 0644, 1547 .proc_handler = proc_dou8vec_minmax, 1548 .extra1 = SYSCTL_ZERO, 1549 .extra2 = &tcp_syn_linear_timeouts_max, 1550 }, 1551 { 1552 .procname = "tcp_shrink_window", 1553 .data = &init_net.ipv4.sysctl_tcp_shrink_window, 1554 .maxlen = sizeof(u8), 1555 .mode = 0644, 1556 .proc_handler = proc_dou8vec_minmax, 1557 .extra1 = SYSCTL_ZERO, 1558 .extra2 = SYSCTL_ONE, 1559 }, 1560 { 1561 .procname = "tcp_pingpong_thresh", 1562 .data = &init_net.ipv4.sysctl_tcp_pingpong_thresh, 1563 .maxlen = sizeof(u8), 1564 .mode = 0644, 1565 .proc_handler = proc_dou8vec_minmax, 1566 .extra1 = SYSCTL_ONE, 1567 }, 1568 { 1569 .procname = "tcp_rto_min_us", 1570 .data = &init_net.ipv4.sysctl_tcp_rto_min_us, 1571 .maxlen = sizeof(int), 1572 .mode = 0644, 1573 .proc_handler = proc_dointvec_minmax, 1574 .extra1 = SYSCTL_ONE, 1575 }, 1576 }; 1577 1578 static __net_init int ipv4_sysctl_init_net(struct net *net) 1579 { 1580 size_t table_size = ARRAY_SIZE(ipv4_net_table); 1581 struct ctl_table *table; 1582 1583 table = ipv4_net_table; 1584 if (!net_eq(net, &init_net)) { 1585 int i; 1586 1587 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); 1588 if (!table) 1589 goto err_alloc; 1590 1591 for (i = 0; i < table_size; i++) { 1592 if (table[i].data) { 1593 /* Update the variables to point into 1594 * the current struct net 1595 */ 1596 table[i].data += (void *)net - (void *)&init_net; 1597 } else { 1598 /* Entries without data pointer are global; 1599 * Make them read-only in non-init_net ns 1600 */ 1601 table[i].mode &= ~0222; 1602 } 1603 } 1604 } 1605 1606 net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table, 1607 table_size); 1608 if (!net->ipv4.ipv4_hdr) 1609 goto err_reg; 1610 1611 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1612 if (!net->ipv4.sysctl_local_reserved_ports) 1613 goto err_ports; 1614 1615 proc_fib_multipath_hash_set_seed(net, 0); 1616 1617 return 0; 1618 1619 err_ports: 1620 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1621 err_reg: 1622 if (!net_eq(net, &init_net)) 1623 kfree(table); 1624 err_alloc: 1625 return -ENOMEM; 1626 } 1627 1628 static __net_exit void ipv4_sysctl_exit_net(struct net *net) 1629 { 1630 const struct ctl_table *table; 1631 1632 kfree(net->ipv4.sysctl_local_reserved_ports); 1633 table = net->ipv4.ipv4_hdr->ctl_table_arg; 1634 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1635 kfree(table); 1636 } 1637 1638 static __net_initdata struct pernet_operations ipv4_sysctl_ops = { 1639 .init = ipv4_sysctl_init_net, 1640 .exit = ipv4_sysctl_exit_net, 1641 }; 1642 1643 static __init int sysctl_ipv4_init(void) 1644 { 1645 struct ctl_table_header *hdr; 1646 1647 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table); 1648 if (!hdr) 1649 return -ENOMEM; 1650 1651 proc_fib_multipath_hash_init_rand_seed(); 1652 1653 if (register_pernet_subsys(&ipv4_sysctl_ops)) { 1654 unregister_net_sysctl_table(hdr); 1655 return -ENOMEM; 1656 } 1657 1658 return 0; 1659 } 1660 1661 __initcall(sysctl_ipv4_init); 1662