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_congestion_control", 559 .maxlen = TCP_CA_BUF_MAX, 560 .mode = 0444, 561 .proc_handler = proc_tcp_available_congestion_control, 562 }, 563 { 564 .procname = "tcp_allowed_congestion_control", 565 .maxlen = TCP_CA_BUF_MAX, 566 .mode = 0644, 567 .proc_handler = proc_allowed_congestion_control, 568 }, 569 { 570 .procname = "tcp_available_ulp", 571 .maxlen = TCP_ULP_BUF_MAX, 572 .mode = 0444, 573 .proc_handler = proc_tcp_available_ulp, 574 }, 575 { 576 .procname = "icmp_msgs_per_sec", 577 .data = &sysctl_icmp_msgs_per_sec, 578 .maxlen = sizeof(int), 579 .mode = 0644, 580 .proc_handler = proc_dointvec_minmax, 581 .extra1 = SYSCTL_ZERO, 582 }, 583 { 584 .procname = "icmp_msgs_burst", 585 .data = &sysctl_icmp_msgs_burst, 586 .maxlen = sizeof(int), 587 .mode = 0644, 588 .proc_handler = proc_dointvec_minmax, 589 .extra1 = SYSCTL_ZERO, 590 }, 591 { 592 .procname = "udp_mem", 593 .data = &sysctl_udp_mem, 594 .maxlen = sizeof(sysctl_udp_mem), 595 .mode = 0644, 596 .proc_handler = proc_doulongvec_minmax, 597 }, 598 { 599 .procname = "fib_sync_mem", 600 .data = &sysctl_fib_sync_mem, 601 .maxlen = sizeof(sysctl_fib_sync_mem), 602 .mode = 0644, 603 .proc_handler = proc_douintvec_minmax, 604 .extra1 = &sysctl_fib_sync_mem_min, 605 .extra2 = &sysctl_fib_sync_mem_max, 606 }, 607 { 608 .procname = "tcp_rx_skb_cache", 609 .data = &tcp_rx_skb_cache_key.key, 610 .mode = 0644, 611 .proc_handler = proc_do_static_key, 612 }, 613 { 614 .procname = "tcp_tx_skb_cache", 615 .data = &tcp_tx_skb_cache_key.key, 616 .mode = 0644, 617 .proc_handler = proc_do_static_key, 618 }, 619 { } 620 }; 621 622 static struct ctl_table ipv4_net_table[] = { 623 { 624 .procname = "icmp_echo_ignore_all", 625 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, 626 .maxlen = sizeof(int), 627 .mode = 0644, 628 .proc_handler = proc_dointvec 629 }, 630 { 631 .procname = "icmp_echo_ignore_broadcasts", 632 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, 633 .maxlen = sizeof(int), 634 .mode = 0644, 635 .proc_handler = proc_dointvec 636 }, 637 { 638 .procname = "icmp_ignore_bogus_error_responses", 639 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, 640 .maxlen = sizeof(int), 641 .mode = 0644, 642 .proc_handler = proc_dointvec 643 }, 644 { 645 .procname = "icmp_errors_use_inbound_ifaddr", 646 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, 647 .maxlen = sizeof(int), 648 .mode = 0644, 649 .proc_handler = proc_dointvec 650 }, 651 { 652 .procname = "icmp_ratelimit", 653 .data = &init_net.ipv4.sysctl_icmp_ratelimit, 654 .maxlen = sizeof(int), 655 .mode = 0644, 656 .proc_handler = proc_dointvec_ms_jiffies, 657 }, 658 { 659 .procname = "icmp_ratemask", 660 .data = &init_net.ipv4.sysctl_icmp_ratemask, 661 .maxlen = sizeof(int), 662 .mode = 0644, 663 .proc_handler = proc_dointvec 664 }, 665 { 666 .procname = "ping_group_range", 667 .data = &init_net.ipv4.ping_group_range.range, 668 .maxlen = sizeof(gid_t)*2, 669 .mode = 0644, 670 .proc_handler = ipv4_ping_group_range, 671 }, 672 #ifdef CONFIG_NET_L3_MASTER_DEV 673 { 674 .procname = "raw_l3mdev_accept", 675 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept, 676 .maxlen = sizeof(int), 677 .mode = 0644, 678 .proc_handler = proc_dointvec_minmax, 679 .extra1 = SYSCTL_ZERO, 680 .extra2 = SYSCTL_ONE, 681 }, 682 #endif 683 { 684 .procname = "tcp_ecn", 685 .data = &init_net.ipv4.sysctl_tcp_ecn, 686 .maxlen = sizeof(int), 687 .mode = 0644, 688 .proc_handler = proc_dointvec 689 }, 690 { 691 .procname = "tcp_ecn_fallback", 692 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback, 693 .maxlen = sizeof(int), 694 .mode = 0644, 695 .proc_handler = proc_dointvec 696 }, 697 { 698 .procname = "ip_dynaddr", 699 .data = &init_net.ipv4.sysctl_ip_dynaddr, 700 .maxlen = sizeof(int), 701 .mode = 0644, 702 .proc_handler = proc_dointvec 703 }, 704 { 705 .procname = "ip_early_demux", 706 .data = &init_net.ipv4.sysctl_ip_early_demux, 707 .maxlen = sizeof(int), 708 .mode = 0644, 709 .proc_handler = proc_dointvec 710 }, 711 { 712 .procname = "udp_early_demux", 713 .data = &init_net.ipv4.sysctl_udp_early_demux, 714 .maxlen = sizeof(int), 715 .mode = 0644, 716 .proc_handler = proc_udp_early_demux 717 }, 718 { 719 .procname = "tcp_early_demux", 720 .data = &init_net.ipv4.sysctl_tcp_early_demux, 721 .maxlen = sizeof(int), 722 .mode = 0644, 723 .proc_handler = proc_tcp_early_demux 724 }, 725 { 726 .procname = "ip_default_ttl", 727 .data = &init_net.ipv4.sysctl_ip_default_ttl, 728 .maxlen = sizeof(int), 729 .mode = 0644, 730 .proc_handler = proc_dointvec_minmax, 731 .extra1 = &ip_ttl_min, 732 .extra2 = &ip_ttl_max, 733 }, 734 { 735 .procname = "ip_local_port_range", 736 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range), 737 .data = &init_net.ipv4.ip_local_ports.range, 738 .mode = 0644, 739 .proc_handler = ipv4_local_port_range, 740 }, 741 { 742 .procname = "ip_local_reserved_ports", 743 .data = &init_net.ipv4.sysctl_local_reserved_ports, 744 .maxlen = 65536, 745 .mode = 0644, 746 .proc_handler = proc_do_large_bitmap, 747 }, 748 { 749 .procname = "ip_no_pmtu_disc", 750 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc, 751 .maxlen = sizeof(int), 752 .mode = 0644, 753 .proc_handler = proc_dointvec 754 }, 755 { 756 .procname = "ip_forward_use_pmtu", 757 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu, 758 .maxlen = sizeof(int), 759 .mode = 0644, 760 .proc_handler = proc_dointvec, 761 }, 762 { 763 .procname = "ip_forward_update_priority", 764 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority, 765 .maxlen = sizeof(int), 766 .mode = 0644, 767 .proc_handler = ipv4_fwd_update_priority, 768 .extra1 = SYSCTL_ZERO, 769 .extra2 = SYSCTL_ONE, 770 }, 771 { 772 .procname = "ip_nonlocal_bind", 773 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind, 774 .maxlen = sizeof(int), 775 .mode = 0644, 776 .proc_handler = proc_dointvec 777 }, 778 { 779 .procname = "fwmark_reflect", 780 .data = &init_net.ipv4.sysctl_fwmark_reflect, 781 .maxlen = sizeof(int), 782 .mode = 0644, 783 .proc_handler = proc_dointvec, 784 }, 785 { 786 .procname = "tcp_fwmark_accept", 787 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept, 788 .maxlen = sizeof(int), 789 .mode = 0644, 790 .proc_handler = proc_dointvec, 791 }, 792 #ifdef CONFIG_NET_L3_MASTER_DEV 793 { 794 .procname = "tcp_l3mdev_accept", 795 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept, 796 .maxlen = sizeof(int), 797 .mode = 0644, 798 .proc_handler = proc_dointvec_minmax, 799 .extra1 = SYSCTL_ZERO, 800 .extra2 = SYSCTL_ONE, 801 }, 802 #endif 803 { 804 .procname = "tcp_mtu_probing", 805 .data = &init_net.ipv4.sysctl_tcp_mtu_probing, 806 .maxlen = sizeof(int), 807 .mode = 0644, 808 .proc_handler = proc_dointvec, 809 }, 810 { 811 .procname = "tcp_base_mss", 812 .data = &init_net.ipv4.sysctl_tcp_base_mss, 813 .maxlen = sizeof(int), 814 .mode = 0644, 815 .proc_handler = proc_dointvec, 816 }, 817 { 818 .procname = "tcp_min_snd_mss", 819 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss, 820 .maxlen = sizeof(int), 821 .mode = 0644, 822 .proc_handler = proc_dointvec_minmax, 823 .extra1 = &tcp_min_snd_mss_min, 824 .extra2 = &tcp_min_snd_mss_max, 825 }, 826 { 827 .procname = "tcp_mtu_probe_floor", 828 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor, 829 .maxlen = sizeof(int), 830 .mode = 0644, 831 .proc_handler = proc_dointvec_minmax, 832 .extra1 = &tcp_min_snd_mss_min, 833 .extra2 = &tcp_min_snd_mss_max, 834 }, 835 { 836 .procname = "tcp_probe_threshold", 837 .data = &init_net.ipv4.sysctl_tcp_probe_threshold, 838 .maxlen = sizeof(int), 839 .mode = 0644, 840 .proc_handler = proc_dointvec, 841 }, 842 { 843 .procname = "tcp_probe_interval", 844 .data = &init_net.ipv4.sysctl_tcp_probe_interval, 845 .maxlen = sizeof(u32), 846 .mode = 0644, 847 .proc_handler = proc_douintvec_minmax, 848 .extra2 = &u32_max_div_HZ, 849 }, 850 { 851 .procname = "igmp_link_local_mcast_reports", 852 .data = &init_net.ipv4.sysctl_igmp_llm_reports, 853 .maxlen = sizeof(int), 854 .mode = 0644, 855 .proc_handler = proc_dointvec 856 }, 857 { 858 .procname = "igmp_max_memberships", 859 .data = &init_net.ipv4.sysctl_igmp_max_memberships, 860 .maxlen = sizeof(int), 861 .mode = 0644, 862 .proc_handler = proc_dointvec 863 }, 864 { 865 .procname = "igmp_max_msf", 866 .data = &init_net.ipv4.sysctl_igmp_max_msf, 867 .maxlen = sizeof(int), 868 .mode = 0644, 869 .proc_handler = proc_dointvec 870 }, 871 #ifdef CONFIG_IP_MULTICAST 872 { 873 .procname = "igmp_qrv", 874 .data = &init_net.ipv4.sysctl_igmp_qrv, 875 .maxlen = sizeof(int), 876 .mode = 0644, 877 .proc_handler = proc_dointvec_minmax, 878 .extra1 = SYSCTL_ONE 879 }, 880 #endif 881 { 882 .procname = "tcp_congestion_control", 883 .data = &init_net.ipv4.tcp_congestion_control, 884 .mode = 0644, 885 .maxlen = TCP_CA_NAME_MAX, 886 .proc_handler = proc_tcp_congestion_control, 887 }, 888 { 889 .procname = "tcp_keepalive_time", 890 .data = &init_net.ipv4.sysctl_tcp_keepalive_time, 891 .maxlen = sizeof(int), 892 .mode = 0644, 893 .proc_handler = proc_dointvec_jiffies, 894 }, 895 { 896 .procname = "tcp_keepalive_probes", 897 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes, 898 .maxlen = sizeof(int), 899 .mode = 0644, 900 .proc_handler = proc_dointvec 901 }, 902 { 903 .procname = "tcp_keepalive_intvl", 904 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl, 905 .maxlen = sizeof(int), 906 .mode = 0644, 907 .proc_handler = proc_dointvec_jiffies, 908 }, 909 { 910 .procname = "tcp_syn_retries", 911 .data = &init_net.ipv4.sysctl_tcp_syn_retries, 912 .maxlen = sizeof(int), 913 .mode = 0644, 914 .proc_handler = proc_dointvec_minmax, 915 .extra1 = &tcp_syn_retries_min, 916 .extra2 = &tcp_syn_retries_max 917 }, 918 { 919 .procname = "tcp_synack_retries", 920 .data = &init_net.ipv4.sysctl_tcp_synack_retries, 921 .maxlen = sizeof(int), 922 .mode = 0644, 923 .proc_handler = proc_dointvec 924 }, 925 #ifdef CONFIG_SYN_COOKIES 926 { 927 .procname = "tcp_syncookies", 928 .data = &init_net.ipv4.sysctl_tcp_syncookies, 929 .maxlen = sizeof(int), 930 .mode = 0644, 931 .proc_handler = proc_dointvec 932 }, 933 #endif 934 { 935 .procname = "tcp_reordering", 936 .data = &init_net.ipv4.sysctl_tcp_reordering, 937 .maxlen = sizeof(int), 938 .mode = 0644, 939 .proc_handler = proc_dointvec 940 }, 941 { 942 .procname = "tcp_retries1", 943 .data = &init_net.ipv4.sysctl_tcp_retries1, 944 .maxlen = sizeof(int), 945 .mode = 0644, 946 .proc_handler = proc_dointvec_minmax, 947 .extra2 = &tcp_retr1_max 948 }, 949 { 950 .procname = "tcp_retries2", 951 .data = &init_net.ipv4.sysctl_tcp_retries2, 952 .maxlen = sizeof(int), 953 .mode = 0644, 954 .proc_handler = proc_dointvec 955 }, 956 { 957 .procname = "tcp_orphan_retries", 958 .data = &init_net.ipv4.sysctl_tcp_orphan_retries, 959 .maxlen = sizeof(int), 960 .mode = 0644, 961 .proc_handler = proc_dointvec 962 }, 963 { 964 .procname = "tcp_fin_timeout", 965 .data = &init_net.ipv4.sysctl_tcp_fin_timeout, 966 .maxlen = sizeof(int), 967 .mode = 0644, 968 .proc_handler = proc_dointvec_jiffies, 969 }, 970 { 971 .procname = "tcp_notsent_lowat", 972 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat, 973 .maxlen = sizeof(unsigned int), 974 .mode = 0644, 975 .proc_handler = proc_douintvec, 976 }, 977 { 978 .procname = "tcp_tw_reuse", 979 .data = &init_net.ipv4.sysctl_tcp_tw_reuse, 980 .maxlen = sizeof(int), 981 .mode = 0644, 982 .proc_handler = proc_dointvec_minmax, 983 .extra1 = SYSCTL_ZERO, 984 .extra2 = &two, 985 }, 986 { 987 .procname = "tcp_max_tw_buckets", 988 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, 989 .maxlen = sizeof(int), 990 .mode = 0644, 991 .proc_handler = proc_dointvec 992 }, 993 { 994 .procname = "tcp_max_syn_backlog", 995 .data = &init_net.ipv4.sysctl_max_syn_backlog, 996 .maxlen = sizeof(int), 997 .mode = 0644, 998 .proc_handler = proc_dointvec 999 }, 1000 { 1001 .procname = "tcp_fastopen", 1002 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1003 .maxlen = sizeof(int), 1004 .mode = 0644, 1005 .proc_handler = proc_dointvec, 1006 }, 1007 { 1008 .procname = "tcp_fastopen_key", 1009 .mode = 0600, 1010 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1011 /* maxlen to print the list of keys in hex (*2), with dashes 1012 * separating doublewords and a comma in between keys. 1013 */ 1014 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 1015 2 * TCP_FASTOPEN_KEY_MAX) + 1016 (TCP_FASTOPEN_KEY_MAX * 5)), 1017 .proc_handler = proc_tcp_fastopen_key, 1018 }, 1019 { 1020 .procname = "tcp_fastopen_blackhole_timeout_sec", 1021 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout, 1022 .maxlen = sizeof(int), 1023 .mode = 0644, 1024 .proc_handler = proc_tfo_blackhole_detect_timeout, 1025 .extra1 = SYSCTL_ZERO, 1026 }, 1027 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1028 { 1029 .procname = "fib_multipath_use_neigh", 1030 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh, 1031 .maxlen = sizeof(int), 1032 .mode = 0644, 1033 .proc_handler = proc_dointvec_minmax, 1034 .extra1 = SYSCTL_ZERO, 1035 .extra2 = SYSCTL_ONE, 1036 }, 1037 { 1038 .procname = "fib_multipath_hash_policy", 1039 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy, 1040 .maxlen = sizeof(int), 1041 .mode = 0644, 1042 .proc_handler = proc_fib_multipath_hash_policy, 1043 .extra1 = SYSCTL_ZERO, 1044 .extra2 = &two, 1045 }, 1046 #endif 1047 { 1048 .procname = "ip_unprivileged_port_start", 1049 .maxlen = sizeof(int), 1050 .data = &init_net.ipv4.sysctl_ip_prot_sock, 1051 .mode = 0644, 1052 .proc_handler = ipv4_privileged_ports, 1053 }, 1054 #ifdef CONFIG_NET_L3_MASTER_DEV 1055 { 1056 .procname = "udp_l3mdev_accept", 1057 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept, 1058 .maxlen = sizeof(int), 1059 .mode = 0644, 1060 .proc_handler = proc_dointvec_minmax, 1061 .extra1 = SYSCTL_ZERO, 1062 .extra2 = SYSCTL_ONE, 1063 }, 1064 #endif 1065 { 1066 .procname = "tcp_sack", 1067 .data = &init_net.ipv4.sysctl_tcp_sack, 1068 .maxlen = sizeof(int), 1069 .mode = 0644, 1070 .proc_handler = proc_dointvec 1071 }, 1072 { 1073 .procname = "tcp_window_scaling", 1074 .data = &init_net.ipv4.sysctl_tcp_window_scaling, 1075 .maxlen = sizeof(int), 1076 .mode = 0644, 1077 .proc_handler = proc_dointvec 1078 }, 1079 { 1080 .procname = "tcp_timestamps", 1081 .data = &init_net.ipv4.sysctl_tcp_timestamps, 1082 .maxlen = sizeof(int), 1083 .mode = 0644, 1084 .proc_handler = proc_dointvec 1085 }, 1086 { 1087 .procname = "tcp_early_retrans", 1088 .data = &init_net.ipv4.sysctl_tcp_early_retrans, 1089 .maxlen = sizeof(int), 1090 .mode = 0644, 1091 .proc_handler = proc_dointvec_minmax, 1092 .extra1 = SYSCTL_ZERO, 1093 .extra2 = &four, 1094 }, 1095 { 1096 .procname = "tcp_recovery", 1097 .data = &init_net.ipv4.sysctl_tcp_recovery, 1098 .maxlen = sizeof(int), 1099 .mode = 0644, 1100 .proc_handler = proc_dointvec, 1101 }, 1102 { 1103 .procname = "tcp_thin_linear_timeouts", 1104 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts, 1105 .maxlen = sizeof(int), 1106 .mode = 0644, 1107 .proc_handler = proc_dointvec 1108 }, 1109 { 1110 .procname = "tcp_slow_start_after_idle", 1111 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle, 1112 .maxlen = sizeof(int), 1113 .mode = 0644, 1114 .proc_handler = proc_dointvec 1115 }, 1116 { 1117 .procname = "tcp_retrans_collapse", 1118 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse, 1119 .maxlen = sizeof(int), 1120 .mode = 0644, 1121 .proc_handler = proc_dointvec 1122 }, 1123 { 1124 .procname = "tcp_stdurg", 1125 .data = &init_net.ipv4.sysctl_tcp_stdurg, 1126 .maxlen = sizeof(int), 1127 .mode = 0644, 1128 .proc_handler = proc_dointvec 1129 }, 1130 { 1131 .procname = "tcp_rfc1337", 1132 .data = &init_net.ipv4.sysctl_tcp_rfc1337, 1133 .maxlen = sizeof(int), 1134 .mode = 0644, 1135 .proc_handler = proc_dointvec 1136 }, 1137 { 1138 .procname = "tcp_abort_on_overflow", 1139 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow, 1140 .maxlen = sizeof(int), 1141 .mode = 0644, 1142 .proc_handler = proc_dointvec 1143 }, 1144 { 1145 .procname = "tcp_fack", 1146 .data = &init_net.ipv4.sysctl_tcp_fack, 1147 .maxlen = sizeof(int), 1148 .mode = 0644, 1149 .proc_handler = proc_dointvec 1150 }, 1151 { 1152 .procname = "tcp_max_reordering", 1153 .data = &init_net.ipv4.sysctl_tcp_max_reordering, 1154 .maxlen = sizeof(int), 1155 .mode = 0644, 1156 .proc_handler = proc_dointvec 1157 }, 1158 { 1159 .procname = "tcp_dsack", 1160 .data = &init_net.ipv4.sysctl_tcp_dsack, 1161 .maxlen = sizeof(int), 1162 .mode = 0644, 1163 .proc_handler = proc_dointvec 1164 }, 1165 { 1166 .procname = "tcp_app_win", 1167 .data = &init_net.ipv4.sysctl_tcp_app_win, 1168 .maxlen = sizeof(int), 1169 .mode = 0644, 1170 .proc_handler = proc_dointvec 1171 }, 1172 { 1173 .procname = "tcp_adv_win_scale", 1174 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale, 1175 .maxlen = sizeof(int), 1176 .mode = 0644, 1177 .proc_handler = proc_dointvec_minmax, 1178 .extra1 = &tcp_adv_win_scale_min, 1179 .extra2 = &tcp_adv_win_scale_max, 1180 }, 1181 { 1182 .procname = "tcp_frto", 1183 .data = &init_net.ipv4.sysctl_tcp_frto, 1184 .maxlen = sizeof(int), 1185 .mode = 0644, 1186 .proc_handler = proc_dointvec 1187 }, 1188 { 1189 .procname = "tcp_no_metrics_save", 1190 .data = &init_net.ipv4.sysctl_tcp_nometrics_save, 1191 .maxlen = sizeof(int), 1192 .mode = 0644, 1193 .proc_handler = proc_dointvec, 1194 }, 1195 { 1196 .procname = "tcp_no_ssthresh_metrics_save", 1197 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save, 1198 .maxlen = sizeof(int), 1199 .mode = 0644, 1200 .proc_handler = proc_dointvec_minmax, 1201 .extra1 = SYSCTL_ZERO, 1202 .extra2 = SYSCTL_ONE, 1203 }, 1204 { 1205 .procname = "tcp_moderate_rcvbuf", 1206 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf, 1207 .maxlen = sizeof(int), 1208 .mode = 0644, 1209 .proc_handler = proc_dointvec, 1210 }, 1211 { 1212 .procname = "tcp_tso_win_divisor", 1213 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor, 1214 .maxlen = sizeof(int), 1215 .mode = 0644, 1216 .proc_handler = proc_dointvec, 1217 }, 1218 { 1219 .procname = "tcp_workaround_signed_windows", 1220 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows, 1221 .maxlen = sizeof(int), 1222 .mode = 0644, 1223 .proc_handler = proc_dointvec 1224 }, 1225 { 1226 .procname = "tcp_limit_output_bytes", 1227 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes, 1228 .maxlen = sizeof(int), 1229 .mode = 0644, 1230 .proc_handler = proc_dointvec 1231 }, 1232 { 1233 .procname = "tcp_challenge_ack_limit", 1234 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit, 1235 .maxlen = sizeof(int), 1236 .mode = 0644, 1237 .proc_handler = proc_dointvec 1238 }, 1239 { 1240 .procname = "tcp_min_tso_segs", 1241 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs, 1242 .maxlen = sizeof(int), 1243 .mode = 0644, 1244 .proc_handler = proc_dointvec_minmax, 1245 .extra1 = SYSCTL_ONE, 1246 .extra2 = &gso_max_segs, 1247 }, 1248 { 1249 .procname = "tcp_min_rtt_wlen", 1250 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen, 1251 .maxlen = sizeof(int), 1252 .mode = 0644, 1253 .proc_handler = proc_dointvec_minmax, 1254 .extra1 = SYSCTL_ZERO, 1255 .extra2 = &one_day_secs 1256 }, 1257 { 1258 .procname = "tcp_autocorking", 1259 .data = &init_net.ipv4.sysctl_tcp_autocorking, 1260 .maxlen = sizeof(int), 1261 .mode = 0644, 1262 .proc_handler = proc_dointvec_minmax, 1263 .extra1 = SYSCTL_ZERO, 1264 .extra2 = SYSCTL_ONE, 1265 }, 1266 { 1267 .procname = "tcp_invalid_ratelimit", 1268 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit, 1269 .maxlen = sizeof(int), 1270 .mode = 0644, 1271 .proc_handler = proc_dointvec_ms_jiffies, 1272 }, 1273 { 1274 .procname = "tcp_pacing_ss_ratio", 1275 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio, 1276 .maxlen = sizeof(int), 1277 .mode = 0644, 1278 .proc_handler = proc_dointvec_minmax, 1279 .extra1 = SYSCTL_ZERO, 1280 .extra2 = &thousand, 1281 }, 1282 { 1283 .procname = "tcp_pacing_ca_ratio", 1284 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_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_wmem", 1293 .data = &init_net.ipv4.sysctl_tcp_wmem, 1294 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem), 1295 .mode = 0644, 1296 .proc_handler = proc_dointvec_minmax, 1297 .extra1 = SYSCTL_ONE, 1298 }, 1299 { 1300 .procname = "tcp_rmem", 1301 .data = &init_net.ipv4.sysctl_tcp_rmem, 1302 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem), 1303 .mode = 0644, 1304 .proc_handler = proc_dointvec_minmax, 1305 .extra1 = SYSCTL_ONE, 1306 }, 1307 { 1308 .procname = "tcp_comp_sack_delay_ns", 1309 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns, 1310 .maxlen = sizeof(unsigned long), 1311 .mode = 0644, 1312 .proc_handler = proc_doulongvec_minmax, 1313 }, 1314 { 1315 .procname = "tcp_comp_sack_nr", 1316 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr, 1317 .maxlen = sizeof(int), 1318 .mode = 0644, 1319 .proc_handler = proc_dointvec_minmax, 1320 .extra1 = SYSCTL_ZERO, 1321 .extra2 = &comp_sack_nr_max, 1322 }, 1323 { 1324 .procname = "udp_rmem_min", 1325 .data = &init_net.ipv4.sysctl_udp_rmem_min, 1326 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min), 1327 .mode = 0644, 1328 .proc_handler = proc_dointvec_minmax, 1329 .extra1 = SYSCTL_ONE 1330 }, 1331 { 1332 .procname = "udp_wmem_min", 1333 .data = &init_net.ipv4.sysctl_udp_wmem_min, 1334 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min), 1335 .mode = 0644, 1336 .proc_handler = proc_dointvec_minmax, 1337 .extra1 = SYSCTL_ONE 1338 }, 1339 { } 1340 }; 1341 1342 static __net_init int ipv4_sysctl_init_net(struct net *net) 1343 { 1344 struct ctl_table *table; 1345 1346 table = ipv4_net_table; 1347 if (!net_eq(net, &init_net)) { 1348 int i; 1349 1350 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); 1351 if (!table) 1352 goto err_alloc; 1353 1354 /* Update the variables to point into the current struct net */ 1355 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) 1356 table[i].data += (void *)net - (void *)&init_net; 1357 } 1358 1359 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table); 1360 if (!net->ipv4.ipv4_hdr) 1361 goto err_reg; 1362 1363 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1364 if (!net->ipv4.sysctl_local_reserved_ports) 1365 goto err_ports; 1366 1367 return 0; 1368 1369 err_ports: 1370 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1371 err_reg: 1372 if (!net_eq(net, &init_net)) 1373 kfree(table); 1374 err_alloc: 1375 return -ENOMEM; 1376 } 1377 1378 static __net_exit void ipv4_sysctl_exit_net(struct net *net) 1379 { 1380 struct ctl_table *table; 1381 1382 kfree(net->ipv4.sysctl_local_reserved_ports); 1383 table = net->ipv4.ipv4_hdr->ctl_table_arg; 1384 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1385 kfree(table); 1386 } 1387 1388 static __net_initdata struct pernet_operations ipv4_sysctl_ops = { 1389 .init = ipv4_sysctl_init_net, 1390 .exit = ipv4_sysctl_exit_net, 1391 }; 1392 1393 static __init int sysctl_ipv4_init(void) 1394 { 1395 struct ctl_table_header *hdr; 1396 1397 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table); 1398 if (!hdr) 1399 return -ENOMEM; 1400 1401 if (register_pernet_subsys(&ipv4_sysctl_ops)) { 1402 unregister_net_sysctl_table(hdr); 1403 return -ENOMEM; 1404 } 1405 1406 return 0; 1407 } 1408 1409 __initcall(sysctl_ipv4_init); 1410