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