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 if (i + 1 < n_keys) 344 off += snprintf(tbl.data + off, tbl.maxlen - off, ","); 345 } 346 347 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 348 349 if (write && ret == 0) { 350 backup_data = strchr(tbl.data, ','); 351 if (backup_data) { 352 *backup_data = '\0'; 353 backup_data++; 354 } 355 if (sscanf_key(tbl.data, key)) { 356 ret = -EINVAL; 357 goto bad_key; 358 } 359 if (backup_data) { 360 if (sscanf_key(backup_data, key + 4)) { 361 ret = -EINVAL; 362 goto bad_key; 363 } 364 } 365 tcp_fastopen_reset_cipher(net, NULL, key, 366 backup_data ? key + 4 : NULL); 367 } 368 369 bad_key: 370 kfree(tbl.data); 371 return ret; 372 } 373 374 static void proc_configure_early_demux(int enabled, int protocol) 375 { 376 struct net_protocol *ipprot; 377 #if IS_ENABLED(CONFIG_IPV6) 378 struct inet6_protocol *ip6prot; 379 #endif 380 381 rcu_read_lock(); 382 383 ipprot = rcu_dereference(inet_protos[protocol]); 384 if (ipprot) 385 ipprot->early_demux = enabled ? ipprot->early_demux_handler : 386 NULL; 387 388 #if IS_ENABLED(CONFIG_IPV6) 389 ip6prot = rcu_dereference(inet6_protos[protocol]); 390 if (ip6prot) 391 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler : 392 NULL; 393 #endif 394 rcu_read_unlock(); 395 } 396 397 static int proc_tcp_early_demux(struct ctl_table *table, int write, 398 void __user *buffer, size_t *lenp, loff_t *ppos) 399 { 400 int ret = 0; 401 402 ret = proc_dointvec(table, write, buffer, lenp, ppos); 403 404 if (write && !ret) { 405 int enabled = init_net.ipv4.sysctl_tcp_early_demux; 406 407 proc_configure_early_demux(enabled, IPPROTO_TCP); 408 } 409 410 return ret; 411 } 412 413 static int proc_udp_early_demux(struct ctl_table *table, int write, 414 void __user *buffer, size_t *lenp, loff_t *ppos) 415 { 416 int ret = 0; 417 418 ret = proc_dointvec(table, write, buffer, lenp, ppos); 419 420 if (write && !ret) { 421 int enabled = init_net.ipv4.sysctl_udp_early_demux; 422 423 proc_configure_early_demux(enabled, IPPROTO_UDP); 424 } 425 426 return ret; 427 } 428 429 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table, 430 int write, 431 void __user *buffer, 432 size_t *lenp, loff_t *ppos) 433 { 434 struct net *net = container_of(table->data, struct net, 435 ipv4.sysctl_tcp_fastopen_blackhole_timeout); 436 int ret; 437 438 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 439 if (write && ret == 0) 440 atomic_set(&net->ipv4.tfo_active_disable_times, 0); 441 442 return ret; 443 } 444 445 static int proc_tcp_available_ulp(struct ctl_table *ctl, 446 int write, 447 void __user *buffer, size_t *lenp, 448 loff_t *ppos) 449 { 450 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, }; 451 int ret; 452 453 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 454 if (!tbl.data) 455 return -ENOMEM; 456 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX); 457 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 458 kfree(tbl.data); 459 460 return ret; 461 } 462 463 #ifdef CONFIG_IP_ROUTE_MULTIPATH 464 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write, 465 void __user *buffer, size_t *lenp, 466 loff_t *ppos) 467 { 468 struct net *net = container_of(table->data, struct net, 469 ipv4.sysctl_fib_multipath_hash_policy); 470 int ret; 471 472 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 473 if (write && ret == 0) 474 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 475 476 return ret; 477 } 478 #endif 479 480 static struct ctl_table ipv4_table[] = { 481 { 482 .procname = "tcp_max_orphans", 483 .data = &sysctl_tcp_max_orphans, 484 .maxlen = sizeof(int), 485 .mode = 0644, 486 .proc_handler = proc_dointvec 487 }, 488 { 489 .procname = "inet_peer_threshold", 490 .data = &inet_peer_threshold, 491 .maxlen = sizeof(int), 492 .mode = 0644, 493 .proc_handler = proc_dointvec 494 }, 495 { 496 .procname = "inet_peer_minttl", 497 .data = &inet_peer_minttl, 498 .maxlen = sizeof(int), 499 .mode = 0644, 500 .proc_handler = proc_dointvec_jiffies, 501 }, 502 { 503 .procname = "inet_peer_maxttl", 504 .data = &inet_peer_maxttl, 505 .maxlen = sizeof(int), 506 .mode = 0644, 507 .proc_handler = proc_dointvec_jiffies, 508 }, 509 { 510 .procname = "tcp_mem", 511 .maxlen = sizeof(sysctl_tcp_mem), 512 .data = &sysctl_tcp_mem, 513 .mode = 0644, 514 .proc_handler = proc_doulongvec_minmax, 515 }, 516 { 517 .procname = "tcp_low_latency", 518 .data = &sysctl_tcp_low_latency, 519 .maxlen = sizeof(int), 520 .mode = 0644, 521 .proc_handler = proc_dointvec 522 }, 523 #ifdef CONFIG_NETLABEL 524 { 525 .procname = "cipso_cache_enable", 526 .data = &cipso_v4_cache_enabled, 527 .maxlen = sizeof(int), 528 .mode = 0644, 529 .proc_handler = proc_dointvec, 530 }, 531 { 532 .procname = "cipso_cache_bucket_size", 533 .data = &cipso_v4_cache_bucketsize, 534 .maxlen = sizeof(int), 535 .mode = 0644, 536 .proc_handler = proc_dointvec, 537 }, 538 { 539 .procname = "cipso_rbm_optfmt", 540 .data = &cipso_v4_rbm_optfmt, 541 .maxlen = sizeof(int), 542 .mode = 0644, 543 .proc_handler = proc_dointvec, 544 }, 545 { 546 .procname = "cipso_rbm_strictvalid", 547 .data = &cipso_v4_rbm_strictvalid, 548 .maxlen = sizeof(int), 549 .mode = 0644, 550 .proc_handler = proc_dointvec, 551 }, 552 #endif /* CONFIG_NETLABEL */ 553 { 554 .procname = "tcp_available_congestion_control", 555 .maxlen = TCP_CA_BUF_MAX, 556 .mode = 0444, 557 .proc_handler = proc_tcp_available_congestion_control, 558 }, 559 { 560 .procname = "tcp_allowed_congestion_control", 561 .maxlen = TCP_CA_BUF_MAX, 562 .mode = 0644, 563 .proc_handler = proc_allowed_congestion_control, 564 }, 565 { 566 .procname = "tcp_available_ulp", 567 .maxlen = TCP_ULP_BUF_MAX, 568 .mode = 0444, 569 .proc_handler = proc_tcp_available_ulp, 570 }, 571 { 572 .procname = "icmp_msgs_per_sec", 573 .data = &sysctl_icmp_msgs_per_sec, 574 .maxlen = sizeof(int), 575 .mode = 0644, 576 .proc_handler = proc_dointvec_minmax, 577 .extra1 = SYSCTL_ZERO, 578 }, 579 { 580 .procname = "icmp_msgs_burst", 581 .data = &sysctl_icmp_msgs_burst, 582 .maxlen = sizeof(int), 583 .mode = 0644, 584 .proc_handler = proc_dointvec_minmax, 585 .extra1 = SYSCTL_ZERO, 586 }, 587 { 588 .procname = "udp_mem", 589 .data = &sysctl_udp_mem, 590 .maxlen = sizeof(sysctl_udp_mem), 591 .mode = 0644, 592 .proc_handler = proc_doulongvec_minmax, 593 }, 594 { 595 .procname = "fib_sync_mem", 596 .data = &sysctl_fib_sync_mem, 597 .maxlen = sizeof(sysctl_fib_sync_mem), 598 .mode = 0644, 599 .proc_handler = proc_douintvec_minmax, 600 .extra1 = &sysctl_fib_sync_mem_min, 601 .extra2 = &sysctl_fib_sync_mem_max, 602 }, 603 { 604 .procname = "tcp_rx_skb_cache", 605 .data = &tcp_rx_skb_cache_key.key, 606 .mode = 0644, 607 .proc_handler = proc_do_static_key, 608 }, 609 { 610 .procname = "tcp_tx_skb_cache", 611 .data = &tcp_tx_skb_cache_key.key, 612 .mode = 0644, 613 .proc_handler = proc_do_static_key, 614 }, 615 { } 616 }; 617 618 static struct ctl_table ipv4_net_table[] = { 619 { 620 .procname = "icmp_echo_ignore_all", 621 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, 622 .maxlen = sizeof(int), 623 .mode = 0644, 624 .proc_handler = proc_dointvec 625 }, 626 { 627 .procname = "icmp_echo_ignore_broadcasts", 628 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, 629 .maxlen = sizeof(int), 630 .mode = 0644, 631 .proc_handler = proc_dointvec 632 }, 633 { 634 .procname = "icmp_ignore_bogus_error_responses", 635 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, 636 .maxlen = sizeof(int), 637 .mode = 0644, 638 .proc_handler = proc_dointvec 639 }, 640 { 641 .procname = "icmp_errors_use_inbound_ifaddr", 642 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, 643 .maxlen = sizeof(int), 644 .mode = 0644, 645 .proc_handler = proc_dointvec 646 }, 647 { 648 .procname = "icmp_ratelimit", 649 .data = &init_net.ipv4.sysctl_icmp_ratelimit, 650 .maxlen = sizeof(int), 651 .mode = 0644, 652 .proc_handler = proc_dointvec_ms_jiffies, 653 }, 654 { 655 .procname = "icmp_ratemask", 656 .data = &init_net.ipv4.sysctl_icmp_ratemask, 657 .maxlen = sizeof(int), 658 .mode = 0644, 659 .proc_handler = proc_dointvec 660 }, 661 { 662 .procname = "ping_group_range", 663 .data = &init_net.ipv4.ping_group_range.range, 664 .maxlen = sizeof(gid_t)*2, 665 .mode = 0644, 666 .proc_handler = ipv4_ping_group_range, 667 }, 668 #ifdef CONFIG_NET_L3_MASTER_DEV 669 { 670 .procname = "raw_l3mdev_accept", 671 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept, 672 .maxlen = sizeof(int), 673 .mode = 0644, 674 .proc_handler = proc_dointvec_minmax, 675 .extra1 = SYSCTL_ZERO, 676 .extra2 = SYSCTL_ONE, 677 }, 678 #endif 679 { 680 .procname = "tcp_ecn", 681 .data = &init_net.ipv4.sysctl_tcp_ecn, 682 .maxlen = sizeof(int), 683 .mode = 0644, 684 .proc_handler = proc_dointvec 685 }, 686 { 687 .procname = "tcp_ecn_fallback", 688 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback, 689 .maxlen = sizeof(int), 690 .mode = 0644, 691 .proc_handler = proc_dointvec 692 }, 693 { 694 .procname = "ip_dynaddr", 695 .data = &init_net.ipv4.sysctl_ip_dynaddr, 696 .maxlen = sizeof(int), 697 .mode = 0644, 698 .proc_handler = proc_dointvec 699 }, 700 { 701 .procname = "ip_early_demux", 702 .data = &init_net.ipv4.sysctl_ip_early_demux, 703 .maxlen = sizeof(int), 704 .mode = 0644, 705 .proc_handler = proc_dointvec 706 }, 707 { 708 .procname = "udp_early_demux", 709 .data = &init_net.ipv4.sysctl_udp_early_demux, 710 .maxlen = sizeof(int), 711 .mode = 0644, 712 .proc_handler = proc_udp_early_demux 713 }, 714 { 715 .procname = "tcp_early_demux", 716 .data = &init_net.ipv4.sysctl_tcp_early_demux, 717 .maxlen = sizeof(int), 718 .mode = 0644, 719 .proc_handler = proc_tcp_early_demux 720 }, 721 { 722 .procname = "ip_default_ttl", 723 .data = &init_net.ipv4.sysctl_ip_default_ttl, 724 .maxlen = sizeof(int), 725 .mode = 0644, 726 .proc_handler = proc_dointvec_minmax, 727 .extra1 = &ip_ttl_min, 728 .extra2 = &ip_ttl_max, 729 }, 730 { 731 .procname = "ip_local_port_range", 732 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range), 733 .data = &init_net.ipv4.ip_local_ports.range, 734 .mode = 0644, 735 .proc_handler = ipv4_local_port_range, 736 }, 737 { 738 .procname = "ip_local_reserved_ports", 739 .data = &init_net.ipv4.sysctl_local_reserved_ports, 740 .maxlen = 65536, 741 .mode = 0644, 742 .proc_handler = proc_do_large_bitmap, 743 }, 744 { 745 .procname = "ip_no_pmtu_disc", 746 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc, 747 .maxlen = sizeof(int), 748 .mode = 0644, 749 .proc_handler = proc_dointvec 750 }, 751 { 752 .procname = "ip_forward_use_pmtu", 753 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu, 754 .maxlen = sizeof(int), 755 .mode = 0644, 756 .proc_handler = proc_dointvec, 757 }, 758 { 759 .procname = "ip_forward_update_priority", 760 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority, 761 .maxlen = sizeof(int), 762 .mode = 0644, 763 .proc_handler = ipv4_fwd_update_priority, 764 .extra1 = SYSCTL_ZERO, 765 .extra2 = SYSCTL_ONE, 766 }, 767 { 768 .procname = "ip_nonlocal_bind", 769 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind, 770 .maxlen = sizeof(int), 771 .mode = 0644, 772 .proc_handler = proc_dointvec 773 }, 774 { 775 .procname = "fwmark_reflect", 776 .data = &init_net.ipv4.sysctl_fwmark_reflect, 777 .maxlen = sizeof(int), 778 .mode = 0644, 779 .proc_handler = proc_dointvec, 780 }, 781 { 782 .procname = "tcp_fwmark_accept", 783 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept, 784 .maxlen = sizeof(int), 785 .mode = 0644, 786 .proc_handler = proc_dointvec, 787 }, 788 #ifdef CONFIG_NET_L3_MASTER_DEV 789 { 790 .procname = "tcp_l3mdev_accept", 791 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept, 792 .maxlen = sizeof(int), 793 .mode = 0644, 794 .proc_handler = proc_dointvec_minmax, 795 .extra1 = SYSCTL_ZERO, 796 .extra2 = SYSCTL_ONE, 797 }, 798 #endif 799 { 800 .procname = "tcp_mtu_probing", 801 .data = &init_net.ipv4.sysctl_tcp_mtu_probing, 802 .maxlen = sizeof(int), 803 .mode = 0644, 804 .proc_handler = proc_dointvec, 805 }, 806 { 807 .procname = "tcp_base_mss", 808 .data = &init_net.ipv4.sysctl_tcp_base_mss, 809 .maxlen = sizeof(int), 810 .mode = 0644, 811 .proc_handler = proc_dointvec, 812 }, 813 { 814 .procname = "tcp_min_snd_mss", 815 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss, 816 .maxlen = sizeof(int), 817 .mode = 0644, 818 .proc_handler = proc_dointvec_minmax, 819 .extra1 = &tcp_min_snd_mss_min, 820 .extra2 = &tcp_min_snd_mss_max, 821 }, 822 { 823 .procname = "tcp_probe_threshold", 824 .data = &init_net.ipv4.sysctl_tcp_probe_threshold, 825 .maxlen = sizeof(int), 826 .mode = 0644, 827 .proc_handler = proc_dointvec, 828 }, 829 { 830 .procname = "tcp_probe_interval", 831 .data = &init_net.ipv4.sysctl_tcp_probe_interval, 832 .maxlen = sizeof(u32), 833 .mode = 0644, 834 .proc_handler = proc_douintvec_minmax, 835 .extra2 = &u32_max_div_HZ, 836 }, 837 { 838 .procname = "igmp_link_local_mcast_reports", 839 .data = &init_net.ipv4.sysctl_igmp_llm_reports, 840 .maxlen = sizeof(int), 841 .mode = 0644, 842 .proc_handler = proc_dointvec 843 }, 844 { 845 .procname = "igmp_max_memberships", 846 .data = &init_net.ipv4.sysctl_igmp_max_memberships, 847 .maxlen = sizeof(int), 848 .mode = 0644, 849 .proc_handler = proc_dointvec 850 }, 851 { 852 .procname = "igmp_max_msf", 853 .data = &init_net.ipv4.sysctl_igmp_max_msf, 854 .maxlen = sizeof(int), 855 .mode = 0644, 856 .proc_handler = proc_dointvec 857 }, 858 #ifdef CONFIG_IP_MULTICAST 859 { 860 .procname = "igmp_qrv", 861 .data = &init_net.ipv4.sysctl_igmp_qrv, 862 .maxlen = sizeof(int), 863 .mode = 0644, 864 .proc_handler = proc_dointvec_minmax, 865 .extra1 = SYSCTL_ONE 866 }, 867 #endif 868 { 869 .procname = "tcp_congestion_control", 870 .data = &init_net.ipv4.tcp_congestion_control, 871 .mode = 0644, 872 .maxlen = TCP_CA_NAME_MAX, 873 .proc_handler = proc_tcp_congestion_control, 874 }, 875 { 876 .procname = "tcp_keepalive_time", 877 .data = &init_net.ipv4.sysctl_tcp_keepalive_time, 878 .maxlen = sizeof(int), 879 .mode = 0644, 880 .proc_handler = proc_dointvec_jiffies, 881 }, 882 { 883 .procname = "tcp_keepalive_probes", 884 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes, 885 .maxlen = sizeof(int), 886 .mode = 0644, 887 .proc_handler = proc_dointvec 888 }, 889 { 890 .procname = "tcp_keepalive_intvl", 891 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl, 892 .maxlen = sizeof(int), 893 .mode = 0644, 894 .proc_handler = proc_dointvec_jiffies, 895 }, 896 { 897 .procname = "tcp_syn_retries", 898 .data = &init_net.ipv4.sysctl_tcp_syn_retries, 899 .maxlen = sizeof(int), 900 .mode = 0644, 901 .proc_handler = proc_dointvec_minmax, 902 .extra1 = &tcp_syn_retries_min, 903 .extra2 = &tcp_syn_retries_max 904 }, 905 { 906 .procname = "tcp_synack_retries", 907 .data = &init_net.ipv4.sysctl_tcp_synack_retries, 908 .maxlen = sizeof(int), 909 .mode = 0644, 910 .proc_handler = proc_dointvec 911 }, 912 #ifdef CONFIG_SYN_COOKIES 913 { 914 .procname = "tcp_syncookies", 915 .data = &init_net.ipv4.sysctl_tcp_syncookies, 916 .maxlen = sizeof(int), 917 .mode = 0644, 918 .proc_handler = proc_dointvec 919 }, 920 #endif 921 { 922 .procname = "tcp_reordering", 923 .data = &init_net.ipv4.sysctl_tcp_reordering, 924 .maxlen = sizeof(int), 925 .mode = 0644, 926 .proc_handler = proc_dointvec 927 }, 928 { 929 .procname = "tcp_retries1", 930 .data = &init_net.ipv4.sysctl_tcp_retries1, 931 .maxlen = sizeof(int), 932 .mode = 0644, 933 .proc_handler = proc_dointvec_minmax, 934 .extra2 = &tcp_retr1_max 935 }, 936 { 937 .procname = "tcp_retries2", 938 .data = &init_net.ipv4.sysctl_tcp_retries2, 939 .maxlen = sizeof(int), 940 .mode = 0644, 941 .proc_handler = proc_dointvec 942 }, 943 { 944 .procname = "tcp_orphan_retries", 945 .data = &init_net.ipv4.sysctl_tcp_orphan_retries, 946 .maxlen = sizeof(int), 947 .mode = 0644, 948 .proc_handler = proc_dointvec 949 }, 950 { 951 .procname = "tcp_fin_timeout", 952 .data = &init_net.ipv4.sysctl_tcp_fin_timeout, 953 .maxlen = sizeof(int), 954 .mode = 0644, 955 .proc_handler = proc_dointvec_jiffies, 956 }, 957 { 958 .procname = "tcp_notsent_lowat", 959 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat, 960 .maxlen = sizeof(unsigned int), 961 .mode = 0644, 962 .proc_handler = proc_douintvec, 963 }, 964 { 965 .procname = "tcp_tw_reuse", 966 .data = &init_net.ipv4.sysctl_tcp_tw_reuse, 967 .maxlen = sizeof(int), 968 .mode = 0644, 969 .proc_handler = proc_dointvec_minmax, 970 .extra1 = SYSCTL_ZERO, 971 .extra2 = &two, 972 }, 973 { 974 .procname = "tcp_max_tw_buckets", 975 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, 976 .maxlen = sizeof(int), 977 .mode = 0644, 978 .proc_handler = proc_dointvec 979 }, 980 { 981 .procname = "tcp_max_syn_backlog", 982 .data = &init_net.ipv4.sysctl_max_syn_backlog, 983 .maxlen = sizeof(int), 984 .mode = 0644, 985 .proc_handler = proc_dointvec 986 }, 987 { 988 .procname = "tcp_fastopen", 989 .data = &init_net.ipv4.sysctl_tcp_fastopen, 990 .maxlen = sizeof(int), 991 .mode = 0644, 992 .proc_handler = proc_dointvec, 993 }, 994 { 995 .procname = "tcp_fastopen_key", 996 .mode = 0600, 997 .data = &init_net.ipv4.sysctl_tcp_fastopen, 998 /* maxlen to print the list of keys in hex (*2), with dashes 999 * separating doublewords and a comma in between keys. 1000 */ 1001 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 1002 2 * TCP_FASTOPEN_KEY_MAX) + 1003 (TCP_FASTOPEN_KEY_MAX * 5)), 1004 .proc_handler = proc_tcp_fastopen_key, 1005 }, 1006 { 1007 .procname = "tcp_fastopen_blackhole_timeout_sec", 1008 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout, 1009 .maxlen = sizeof(int), 1010 .mode = 0644, 1011 .proc_handler = proc_tfo_blackhole_detect_timeout, 1012 .extra1 = SYSCTL_ZERO, 1013 }, 1014 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1015 { 1016 .procname = "fib_multipath_use_neigh", 1017 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh, 1018 .maxlen = sizeof(int), 1019 .mode = 0644, 1020 .proc_handler = proc_dointvec_minmax, 1021 .extra1 = SYSCTL_ZERO, 1022 .extra2 = SYSCTL_ONE, 1023 }, 1024 { 1025 .procname = "fib_multipath_hash_policy", 1026 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy, 1027 .maxlen = sizeof(int), 1028 .mode = 0644, 1029 .proc_handler = proc_fib_multipath_hash_policy, 1030 .extra1 = SYSCTL_ZERO, 1031 .extra2 = SYSCTL_ONE, 1032 }, 1033 #endif 1034 { 1035 .procname = "ip_unprivileged_port_start", 1036 .maxlen = sizeof(int), 1037 .data = &init_net.ipv4.sysctl_ip_prot_sock, 1038 .mode = 0644, 1039 .proc_handler = ipv4_privileged_ports, 1040 }, 1041 #ifdef CONFIG_NET_L3_MASTER_DEV 1042 { 1043 .procname = "udp_l3mdev_accept", 1044 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept, 1045 .maxlen = sizeof(int), 1046 .mode = 0644, 1047 .proc_handler = proc_dointvec_minmax, 1048 .extra1 = SYSCTL_ZERO, 1049 .extra2 = SYSCTL_ONE, 1050 }, 1051 #endif 1052 { 1053 .procname = "tcp_sack", 1054 .data = &init_net.ipv4.sysctl_tcp_sack, 1055 .maxlen = sizeof(int), 1056 .mode = 0644, 1057 .proc_handler = proc_dointvec 1058 }, 1059 { 1060 .procname = "tcp_window_scaling", 1061 .data = &init_net.ipv4.sysctl_tcp_window_scaling, 1062 .maxlen = sizeof(int), 1063 .mode = 0644, 1064 .proc_handler = proc_dointvec 1065 }, 1066 { 1067 .procname = "tcp_timestamps", 1068 .data = &init_net.ipv4.sysctl_tcp_timestamps, 1069 .maxlen = sizeof(int), 1070 .mode = 0644, 1071 .proc_handler = proc_dointvec 1072 }, 1073 { 1074 .procname = "tcp_early_retrans", 1075 .data = &init_net.ipv4.sysctl_tcp_early_retrans, 1076 .maxlen = sizeof(int), 1077 .mode = 0644, 1078 .proc_handler = proc_dointvec_minmax, 1079 .extra1 = SYSCTL_ZERO, 1080 .extra2 = &four, 1081 }, 1082 { 1083 .procname = "tcp_recovery", 1084 .data = &init_net.ipv4.sysctl_tcp_recovery, 1085 .maxlen = sizeof(int), 1086 .mode = 0644, 1087 .proc_handler = proc_dointvec, 1088 }, 1089 { 1090 .procname = "tcp_thin_linear_timeouts", 1091 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts, 1092 .maxlen = sizeof(int), 1093 .mode = 0644, 1094 .proc_handler = proc_dointvec 1095 }, 1096 { 1097 .procname = "tcp_slow_start_after_idle", 1098 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle, 1099 .maxlen = sizeof(int), 1100 .mode = 0644, 1101 .proc_handler = proc_dointvec 1102 }, 1103 { 1104 .procname = "tcp_retrans_collapse", 1105 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse, 1106 .maxlen = sizeof(int), 1107 .mode = 0644, 1108 .proc_handler = proc_dointvec 1109 }, 1110 { 1111 .procname = "tcp_stdurg", 1112 .data = &init_net.ipv4.sysctl_tcp_stdurg, 1113 .maxlen = sizeof(int), 1114 .mode = 0644, 1115 .proc_handler = proc_dointvec 1116 }, 1117 { 1118 .procname = "tcp_rfc1337", 1119 .data = &init_net.ipv4.sysctl_tcp_rfc1337, 1120 .maxlen = sizeof(int), 1121 .mode = 0644, 1122 .proc_handler = proc_dointvec 1123 }, 1124 { 1125 .procname = "tcp_abort_on_overflow", 1126 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow, 1127 .maxlen = sizeof(int), 1128 .mode = 0644, 1129 .proc_handler = proc_dointvec 1130 }, 1131 { 1132 .procname = "tcp_fack", 1133 .data = &init_net.ipv4.sysctl_tcp_fack, 1134 .maxlen = sizeof(int), 1135 .mode = 0644, 1136 .proc_handler = proc_dointvec 1137 }, 1138 { 1139 .procname = "tcp_max_reordering", 1140 .data = &init_net.ipv4.sysctl_tcp_max_reordering, 1141 .maxlen = sizeof(int), 1142 .mode = 0644, 1143 .proc_handler = proc_dointvec 1144 }, 1145 { 1146 .procname = "tcp_dsack", 1147 .data = &init_net.ipv4.sysctl_tcp_dsack, 1148 .maxlen = sizeof(int), 1149 .mode = 0644, 1150 .proc_handler = proc_dointvec 1151 }, 1152 { 1153 .procname = "tcp_app_win", 1154 .data = &init_net.ipv4.sysctl_tcp_app_win, 1155 .maxlen = sizeof(int), 1156 .mode = 0644, 1157 .proc_handler = proc_dointvec 1158 }, 1159 { 1160 .procname = "tcp_adv_win_scale", 1161 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale, 1162 .maxlen = sizeof(int), 1163 .mode = 0644, 1164 .proc_handler = proc_dointvec_minmax, 1165 .extra1 = &tcp_adv_win_scale_min, 1166 .extra2 = &tcp_adv_win_scale_max, 1167 }, 1168 { 1169 .procname = "tcp_frto", 1170 .data = &init_net.ipv4.sysctl_tcp_frto, 1171 .maxlen = sizeof(int), 1172 .mode = 0644, 1173 .proc_handler = proc_dointvec 1174 }, 1175 { 1176 .procname = "tcp_no_metrics_save", 1177 .data = &init_net.ipv4.sysctl_tcp_nometrics_save, 1178 .maxlen = sizeof(int), 1179 .mode = 0644, 1180 .proc_handler = proc_dointvec, 1181 }, 1182 { 1183 .procname = "tcp_moderate_rcvbuf", 1184 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf, 1185 .maxlen = sizeof(int), 1186 .mode = 0644, 1187 .proc_handler = proc_dointvec, 1188 }, 1189 { 1190 .procname = "tcp_tso_win_divisor", 1191 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor, 1192 .maxlen = sizeof(int), 1193 .mode = 0644, 1194 .proc_handler = proc_dointvec, 1195 }, 1196 { 1197 .procname = "tcp_workaround_signed_windows", 1198 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows, 1199 .maxlen = sizeof(int), 1200 .mode = 0644, 1201 .proc_handler = proc_dointvec 1202 }, 1203 { 1204 .procname = "tcp_limit_output_bytes", 1205 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes, 1206 .maxlen = sizeof(int), 1207 .mode = 0644, 1208 .proc_handler = proc_dointvec 1209 }, 1210 { 1211 .procname = "tcp_challenge_ack_limit", 1212 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit, 1213 .maxlen = sizeof(int), 1214 .mode = 0644, 1215 .proc_handler = proc_dointvec 1216 }, 1217 { 1218 .procname = "tcp_min_tso_segs", 1219 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs, 1220 .maxlen = sizeof(int), 1221 .mode = 0644, 1222 .proc_handler = proc_dointvec_minmax, 1223 .extra1 = SYSCTL_ONE, 1224 .extra2 = &gso_max_segs, 1225 }, 1226 { 1227 .procname = "tcp_min_rtt_wlen", 1228 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen, 1229 .maxlen = sizeof(int), 1230 .mode = 0644, 1231 .proc_handler = proc_dointvec_minmax, 1232 .extra1 = SYSCTL_ZERO, 1233 .extra2 = &one_day_secs 1234 }, 1235 { 1236 .procname = "tcp_autocorking", 1237 .data = &init_net.ipv4.sysctl_tcp_autocorking, 1238 .maxlen = sizeof(int), 1239 .mode = 0644, 1240 .proc_handler = proc_dointvec_minmax, 1241 .extra1 = SYSCTL_ZERO, 1242 .extra2 = SYSCTL_ONE, 1243 }, 1244 { 1245 .procname = "tcp_invalid_ratelimit", 1246 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit, 1247 .maxlen = sizeof(int), 1248 .mode = 0644, 1249 .proc_handler = proc_dointvec_ms_jiffies, 1250 }, 1251 { 1252 .procname = "tcp_pacing_ss_ratio", 1253 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio, 1254 .maxlen = sizeof(int), 1255 .mode = 0644, 1256 .proc_handler = proc_dointvec_minmax, 1257 .extra1 = SYSCTL_ZERO, 1258 .extra2 = &thousand, 1259 }, 1260 { 1261 .procname = "tcp_pacing_ca_ratio", 1262 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio, 1263 .maxlen = sizeof(int), 1264 .mode = 0644, 1265 .proc_handler = proc_dointvec_minmax, 1266 .extra1 = SYSCTL_ZERO, 1267 .extra2 = &thousand, 1268 }, 1269 { 1270 .procname = "tcp_wmem", 1271 .data = &init_net.ipv4.sysctl_tcp_wmem, 1272 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem), 1273 .mode = 0644, 1274 .proc_handler = proc_dointvec_minmax, 1275 .extra1 = SYSCTL_ONE, 1276 }, 1277 { 1278 .procname = "tcp_rmem", 1279 .data = &init_net.ipv4.sysctl_tcp_rmem, 1280 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem), 1281 .mode = 0644, 1282 .proc_handler = proc_dointvec_minmax, 1283 .extra1 = SYSCTL_ONE, 1284 }, 1285 { 1286 .procname = "tcp_comp_sack_delay_ns", 1287 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns, 1288 .maxlen = sizeof(unsigned long), 1289 .mode = 0644, 1290 .proc_handler = proc_doulongvec_minmax, 1291 }, 1292 { 1293 .procname = "tcp_comp_sack_nr", 1294 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr, 1295 .maxlen = sizeof(int), 1296 .mode = 0644, 1297 .proc_handler = proc_dointvec_minmax, 1298 .extra1 = SYSCTL_ZERO, 1299 .extra2 = &comp_sack_nr_max, 1300 }, 1301 { 1302 .procname = "udp_rmem_min", 1303 .data = &init_net.ipv4.sysctl_udp_rmem_min, 1304 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min), 1305 .mode = 0644, 1306 .proc_handler = proc_dointvec_minmax, 1307 .extra1 = SYSCTL_ONE 1308 }, 1309 { 1310 .procname = "udp_wmem_min", 1311 .data = &init_net.ipv4.sysctl_udp_wmem_min, 1312 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min), 1313 .mode = 0644, 1314 .proc_handler = proc_dointvec_minmax, 1315 .extra1 = SYSCTL_ONE 1316 }, 1317 { } 1318 }; 1319 1320 static __net_init int ipv4_sysctl_init_net(struct net *net) 1321 { 1322 struct ctl_table *table; 1323 1324 table = ipv4_net_table; 1325 if (!net_eq(net, &init_net)) { 1326 int i; 1327 1328 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); 1329 if (!table) 1330 goto err_alloc; 1331 1332 /* Update the variables to point into the current struct net */ 1333 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) 1334 table[i].data += (void *)net - (void *)&init_net; 1335 } 1336 1337 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table); 1338 if (!net->ipv4.ipv4_hdr) 1339 goto err_reg; 1340 1341 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1342 if (!net->ipv4.sysctl_local_reserved_ports) 1343 goto err_ports; 1344 1345 return 0; 1346 1347 err_ports: 1348 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1349 err_reg: 1350 if (!net_eq(net, &init_net)) 1351 kfree(table); 1352 err_alloc: 1353 return -ENOMEM; 1354 } 1355 1356 static __net_exit void ipv4_sysctl_exit_net(struct net *net) 1357 { 1358 struct ctl_table *table; 1359 1360 kfree(net->ipv4.sysctl_local_reserved_ports); 1361 table = net->ipv4.ipv4_hdr->ctl_table_arg; 1362 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1363 kfree(table); 1364 } 1365 1366 static __net_initdata struct pernet_operations ipv4_sysctl_ops = { 1367 .init = ipv4_sysctl_init_net, 1368 .exit = ipv4_sysctl_exit_net, 1369 }; 1370 1371 static __init int sysctl_ipv4_init(void) 1372 { 1373 struct ctl_table_header *hdr; 1374 1375 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table); 1376 if (!hdr) 1377 return -ENOMEM; 1378 1379 if (register_pernet_subsys(&ipv4_sysctl_ops)) { 1380 unregister_net_sysctl_table(hdr); 1381 return -ENOMEM; 1382 } 1383 1384 return 0; 1385 } 1386 1387 __initcall(sysctl_ipv4_init); 1388