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 *buffer, size_t *lenp, loff_t *ppos) 75 { 76 struct net *net = 77 container_of(table->data, struct net, ipv4.ip_local_ports.range); 78 int ret; 79 int range[2]; 80 struct ctl_table tmp = { 81 .data = &range, 82 .maxlen = sizeof(range), 83 .mode = table->mode, 84 .extra1 = &ip_local_port_range_min, 85 .extra2 = &ip_local_port_range_max, 86 }; 87 88 inet_get_local_port_range(net, &range[0], &range[1]); 89 90 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 91 92 if (write && ret == 0) { 93 /* Ensure that the upper limit is not smaller than the lower, 94 * and that the lower does not encroach upon the privileged 95 * port limit. 96 */ 97 if ((range[1] < range[0]) || 98 (range[0] < net->ipv4.sysctl_ip_prot_sock)) 99 ret = -EINVAL; 100 else 101 set_local_port_range(net, range); 102 } 103 104 return ret; 105 } 106 107 /* Validate changes from /proc interface. */ 108 static int ipv4_privileged_ports(struct ctl_table *table, int write, 109 void *buffer, size_t *lenp, loff_t *ppos) 110 { 111 struct net *net = container_of(table->data, struct net, 112 ipv4.sysctl_ip_prot_sock); 113 int ret; 114 int pports; 115 int range[2]; 116 struct ctl_table tmp = { 117 .data = &pports, 118 .maxlen = sizeof(pports), 119 .mode = table->mode, 120 .extra1 = &ip_privileged_port_min, 121 .extra2 = &ip_privileged_port_max, 122 }; 123 124 pports = net->ipv4.sysctl_ip_prot_sock; 125 126 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 127 128 if (write && ret == 0) { 129 inet_get_local_port_range(net, &range[0], &range[1]); 130 /* Ensure that the local port range doesn't overlap with the 131 * privileged port range. 132 */ 133 if (range[0] < pports) 134 ret = -EINVAL; 135 else 136 net->ipv4.sysctl_ip_prot_sock = pports; 137 } 138 139 return ret; 140 } 141 142 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high) 143 { 144 kgid_t *data = table->data; 145 struct net *net = 146 container_of(table->data, struct net, ipv4.ping_group_range.range); 147 unsigned int seq; 148 do { 149 seq = read_seqbegin(&net->ipv4.ping_group_range.lock); 150 151 *low = data[0]; 152 *high = data[1]; 153 } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); 154 } 155 156 /* Update system visible IP port range */ 157 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high) 158 { 159 kgid_t *data = table->data; 160 struct net *net = 161 container_of(table->data, struct net, ipv4.ping_group_range.range); 162 write_seqlock(&net->ipv4.ping_group_range.lock); 163 data[0] = low; 164 data[1] = high; 165 write_sequnlock(&net->ipv4.ping_group_range.lock); 166 } 167 168 /* Validate changes from /proc interface. */ 169 static int ipv4_ping_group_range(struct ctl_table *table, int write, 170 void *buffer, size_t *lenp, loff_t *ppos) 171 { 172 struct user_namespace *user_ns = current_user_ns(); 173 int ret; 174 gid_t urange[2]; 175 kgid_t low, high; 176 struct ctl_table tmp = { 177 .data = &urange, 178 .maxlen = sizeof(urange), 179 .mode = table->mode, 180 .extra1 = &ip_ping_group_range_min, 181 .extra2 = &ip_ping_group_range_max, 182 }; 183 184 inet_get_ping_group_range_table(table, &low, &high); 185 urange[0] = from_kgid_munged(user_ns, low); 186 urange[1] = from_kgid_munged(user_ns, high); 187 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 188 189 if (write && ret == 0) { 190 low = make_kgid(user_ns, urange[0]); 191 high = make_kgid(user_ns, urange[1]); 192 if (!gid_valid(low) || !gid_valid(high)) 193 return -EINVAL; 194 if (urange[1] < urange[0] || gid_lt(high, low)) { 195 low = make_kgid(&init_user_ns, 1); 196 high = make_kgid(&init_user_ns, 0); 197 } 198 set_ping_group_range(table, low, high); 199 } 200 201 return ret; 202 } 203 204 static int ipv4_fwd_update_priority(struct ctl_table *table, int write, 205 void *buffer, size_t *lenp, loff_t *ppos) 206 { 207 struct net *net; 208 int ret; 209 210 net = container_of(table->data, struct net, 211 ipv4.sysctl_ip_fwd_update_priority); 212 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 213 if (write && ret == 0) 214 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE, 215 net); 216 217 return ret; 218 } 219 220 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write, 221 void *buffer, size_t *lenp, loff_t *ppos) 222 { 223 struct net *net = container_of(ctl->data, struct net, 224 ipv4.tcp_congestion_control); 225 char val[TCP_CA_NAME_MAX]; 226 struct ctl_table tbl = { 227 .data = val, 228 .maxlen = TCP_CA_NAME_MAX, 229 }; 230 int ret; 231 232 tcp_get_default_congestion_control(net, val); 233 234 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 235 if (write && ret == 0) 236 ret = tcp_set_default_congestion_control(net, val); 237 return ret; 238 } 239 240 static int proc_tcp_available_congestion_control(struct ctl_table *ctl, 241 int write, void *buffer, 242 size_t *lenp, loff_t *ppos) 243 { 244 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, }; 245 int ret; 246 247 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 248 if (!tbl.data) 249 return -ENOMEM; 250 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX); 251 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 252 kfree(tbl.data); 253 return ret; 254 } 255 256 static int proc_allowed_congestion_control(struct ctl_table *ctl, 257 int write, void *buffer, 258 size_t *lenp, loff_t *ppos) 259 { 260 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX }; 261 int ret; 262 263 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 264 if (!tbl.data) 265 return -ENOMEM; 266 267 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen); 268 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 269 if (write && ret == 0) 270 ret = tcp_set_allowed_congestion_control(tbl.data); 271 kfree(tbl.data); 272 return ret; 273 } 274 275 static int sscanf_key(char *buf, __le32 *key) 276 { 277 u32 user_key[4]; 278 int i, ret = 0; 279 280 if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1, 281 user_key + 2, user_key + 3) != 4) { 282 ret = -EINVAL; 283 } else { 284 for (i = 0; i < ARRAY_SIZE(user_key); i++) 285 key[i] = cpu_to_le32(user_key[i]); 286 } 287 pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n", 288 user_key[0], user_key[1], user_key[2], user_key[3], buf, ret); 289 290 return ret; 291 } 292 293 static int proc_tcp_fastopen_key(struct ctl_table *table, int write, 294 void *buffer, size_t *lenp, loff_t *ppos) 295 { 296 struct net *net = container_of(table->data, struct net, 297 ipv4.sysctl_tcp_fastopen); 298 /* maxlen to print the list of keys in hex (*2), with dashes 299 * separating doublewords and a comma in between keys. 300 */ 301 struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 302 2 * TCP_FASTOPEN_KEY_MAX) + 303 (TCP_FASTOPEN_KEY_MAX * 5)) }; 304 struct tcp_fastopen_context *ctx; 305 u32 user_key[TCP_FASTOPEN_KEY_MAX * 4]; 306 __le32 key[TCP_FASTOPEN_KEY_MAX * 4]; 307 char *backup_data; 308 int ret, i = 0, off = 0, n_keys = 0; 309 310 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL); 311 if (!tbl.data) 312 return -ENOMEM; 313 314 rcu_read_lock(); 315 ctx = rcu_dereference(net->ipv4.tcp_fastopen_ctx); 316 if (ctx) { 317 n_keys = tcp_fastopen_context_len(ctx); 318 memcpy(&key[0], &ctx->key[0], TCP_FASTOPEN_KEY_LENGTH * n_keys); 319 } 320 rcu_read_unlock(); 321 322 if (!n_keys) { 323 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH); 324 n_keys = 1; 325 } 326 327 for (i = 0; i < n_keys * 4; i++) 328 user_key[i] = le32_to_cpu(key[i]); 329 330 for (i = 0; i < n_keys; i++) { 331 off += snprintf(tbl.data + off, tbl.maxlen - off, 332 "%08x-%08x-%08x-%08x", 333 user_key[i * 4], 334 user_key[i * 4 + 1], 335 user_key[i * 4 + 2], 336 user_key[i * 4 + 3]); 337 338 if (WARN_ON_ONCE(off >= tbl.maxlen - 1)) 339 break; 340 341 if (i + 1 < n_keys) 342 off += snprintf(tbl.data + off, tbl.maxlen - off, ","); 343 } 344 345 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 346 347 if (write && ret == 0) { 348 backup_data = strchr(tbl.data, ','); 349 if (backup_data) { 350 *backup_data = '\0'; 351 backup_data++; 352 } 353 if (sscanf_key(tbl.data, key)) { 354 ret = -EINVAL; 355 goto bad_key; 356 } 357 if (backup_data) { 358 if (sscanf_key(backup_data, key + 4)) { 359 ret = -EINVAL; 360 goto bad_key; 361 } 362 } 363 tcp_fastopen_reset_cipher(net, NULL, key, 364 backup_data ? key + 4 : NULL); 365 } 366 367 bad_key: 368 kfree(tbl.data); 369 return ret; 370 } 371 372 static void proc_configure_early_demux(int enabled, int protocol) 373 { 374 struct net_protocol *ipprot; 375 #if IS_ENABLED(CONFIG_IPV6) 376 struct inet6_protocol *ip6prot; 377 #endif 378 379 rcu_read_lock(); 380 381 ipprot = rcu_dereference(inet_protos[protocol]); 382 if (ipprot) 383 ipprot->early_demux = enabled ? ipprot->early_demux_handler : 384 NULL; 385 386 #if IS_ENABLED(CONFIG_IPV6) 387 ip6prot = rcu_dereference(inet6_protos[protocol]); 388 if (ip6prot) 389 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler : 390 NULL; 391 #endif 392 rcu_read_unlock(); 393 } 394 395 static int proc_tcp_early_demux(struct ctl_table *table, int write, 396 void *buffer, size_t *lenp, loff_t *ppos) 397 { 398 int ret = 0; 399 400 ret = proc_dointvec(table, write, buffer, lenp, ppos); 401 402 if (write && !ret) { 403 int enabled = init_net.ipv4.sysctl_tcp_early_demux; 404 405 proc_configure_early_demux(enabled, IPPROTO_TCP); 406 } 407 408 return ret; 409 } 410 411 static int proc_udp_early_demux(struct ctl_table *table, int write, 412 void *buffer, size_t *lenp, loff_t *ppos) 413 { 414 int ret = 0; 415 416 ret = proc_dointvec(table, write, buffer, lenp, ppos); 417 418 if (write && !ret) { 419 int enabled = init_net.ipv4.sysctl_udp_early_demux; 420 421 proc_configure_early_demux(enabled, IPPROTO_UDP); 422 } 423 424 return ret; 425 } 426 427 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table, 428 int write, void *buffer, 429 size_t *lenp, loff_t *ppos) 430 { 431 struct net *net = container_of(table->data, struct net, 432 ipv4.sysctl_tcp_fastopen_blackhole_timeout); 433 int ret; 434 435 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 436 if (write && ret == 0) 437 atomic_set(&net->ipv4.tfo_active_disable_times, 0); 438 439 return ret; 440 } 441 442 static int proc_tcp_available_ulp(struct ctl_table *ctl, 443 int write, void *buffer, size_t *lenp, 444 loff_t *ppos) 445 { 446 struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, }; 447 int ret; 448 449 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 450 if (!tbl.data) 451 return -ENOMEM; 452 tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX); 453 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 454 kfree(tbl.data); 455 456 return ret; 457 } 458 459 #ifdef CONFIG_IP_ROUTE_MULTIPATH 460 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write, 461 void *buffer, size_t *lenp, 462 loff_t *ppos) 463 { 464 struct net *net = container_of(table->data, struct net, 465 ipv4.sysctl_fib_multipath_hash_policy); 466 int ret; 467 468 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos); 469 if (write && ret == 0) 470 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net); 471 472 return ret; 473 } 474 #endif 475 476 static struct ctl_table ipv4_table[] = { 477 { 478 .procname = "tcp_max_orphans", 479 .data = &sysctl_tcp_max_orphans, 480 .maxlen = sizeof(int), 481 .mode = 0644, 482 .proc_handler = proc_dointvec 483 }, 484 { 485 .procname = "inet_peer_threshold", 486 .data = &inet_peer_threshold, 487 .maxlen = sizeof(int), 488 .mode = 0644, 489 .proc_handler = proc_dointvec 490 }, 491 { 492 .procname = "inet_peer_minttl", 493 .data = &inet_peer_minttl, 494 .maxlen = sizeof(int), 495 .mode = 0644, 496 .proc_handler = proc_dointvec_jiffies, 497 }, 498 { 499 .procname = "inet_peer_maxttl", 500 .data = &inet_peer_maxttl, 501 .maxlen = sizeof(int), 502 .mode = 0644, 503 .proc_handler = proc_dointvec_jiffies, 504 }, 505 { 506 .procname = "tcp_mem", 507 .maxlen = sizeof(sysctl_tcp_mem), 508 .data = &sysctl_tcp_mem, 509 .mode = 0644, 510 .proc_handler = proc_doulongvec_minmax, 511 }, 512 { 513 .procname = "tcp_low_latency", 514 .data = &sysctl_tcp_low_latency, 515 .maxlen = sizeof(int), 516 .mode = 0644, 517 .proc_handler = proc_dointvec 518 }, 519 #ifdef CONFIG_NETLABEL 520 { 521 .procname = "cipso_cache_enable", 522 .data = &cipso_v4_cache_enabled, 523 .maxlen = sizeof(int), 524 .mode = 0644, 525 .proc_handler = proc_dointvec, 526 }, 527 { 528 .procname = "cipso_cache_bucket_size", 529 .data = &cipso_v4_cache_bucketsize, 530 .maxlen = sizeof(int), 531 .mode = 0644, 532 .proc_handler = proc_dointvec, 533 }, 534 { 535 .procname = "cipso_rbm_optfmt", 536 .data = &cipso_v4_rbm_optfmt, 537 .maxlen = sizeof(int), 538 .mode = 0644, 539 .proc_handler = proc_dointvec, 540 }, 541 { 542 .procname = "cipso_rbm_strictvalid", 543 .data = &cipso_v4_rbm_strictvalid, 544 .maxlen = sizeof(int), 545 .mode = 0644, 546 .proc_handler = proc_dointvec, 547 }, 548 #endif /* CONFIG_NETLABEL */ 549 { 550 .procname = "tcp_available_ulp", 551 .maxlen = TCP_ULP_BUF_MAX, 552 .mode = 0444, 553 .proc_handler = proc_tcp_available_ulp, 554 }, 555 { 556 .procname = "icmp_msgs_per_sec", 557 .data = &sysctl_icmp_msgs_per_sec, 558 .maxlen = sizeof(int), 559 .mode = 0644, 560 .proc_handler = proc_dointvec_minmax, 561 .extra1 = SYSCTL_ZERO, 562 }, 563 { 564 .procname = "icmp_msgs_burst", 565 .data = &sysctl_icmp_msgs_burst, 566 .maxlen = sizeof(int), 567 .mode = 0644, 568 .proc_handler = proc_dointvec_minmax, 569 .extra1 = SYSCTL_ZERO, 570 }, 571 { 572 .procname = "udp_mem", 573 .data = &sysctl_udp_mem, 574 .maxlen = sizeof(sysctl_udp_mem), 575 .mode = 0644, 576 .proc_handler = proc_doulongvec_minmax, 577 }, 578 { 579 .procname = "fib_sync_mem", 580 .data = &sysctl_fib_sync_mem, 581 .maxlen = sizeof(sysctl_fib_sync_mem), 582 .mode = 0644, 583 .proc_handler = proc_douintvec_minmax, 584 .extra1 = &sysctl_fib_sync_mem_min, 585 .extra2 = &sysctl_fib_sync_mem_max, 586 }, 587 { 588 .procname = "tcp_rx_skb_cache", 589 .data = &tcp_rx_skb_cache_key.key, 590 .mode = 0644, 591 .proc_handler = proc_do_static_key, 592 }, 593 { 594 .procname = "tcp_tx_skb_cache", 595 .data = &tcp_tx_skb_cache_key.key, 596 .mode = 0644, 597 .proc_handler = proc_do_static_key, 598 }, 599 { } 600 }; 601 602 static struct ctl_table ipv4_net_table[] = { 603 { 604 .procname = "icmp_echo_ignore_all", 605 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, 606 .maxlen = sizeof(int), 607 .mode = 0644, 608 .proc_handler = proc_dointvec 609 }, 610 { 611 .procname = "icmp_echo_ignore_broadcasts", 612 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, 613 .maxlen = sizeof(int), 614 .mode = 0644, 615 .proc_handler = proc_dointvec 616 }, 617 { 618 .procname = "icmp_ignore_bogus_error_responses", 619 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, 620 .maxlen = sizeof(int), 621 .mode = 0644, 622 .proc_handler = proc_dointvec 623 }, 624 { 625 .procname = "icmp_errors_use_inbound_ifaddr", 626 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, 627 .maxlen = sizeof(int), 628 .mode = 0644, 629 .proc_handler = proc_dointvec 630 }, 631 { 632 .procname = "icmp_ratelimit", 633 .data = &init_net.ipv4.sysctl_icmp_ratelimit, 634 .maxlen = sizeof(int), 635 .mode = 0644, 636 .proc_handler = proc_dointvec_ms_jiffies, 637 }, 638 { 639 .procname = "icmp_ratemask", 640 .data = &init_net.ipv4.sysctl_icmp_ratemask, 641 .maxlen = sizeof(int), 642 .mode = 0644, 643 .proc_handler = proc_dointvec 644 }, 645 { 646 .procname = "ping_group_range", 647 .data = &init_net.ipv4.ping_group_range.range, 648 .maxlen = sizeof(gid_t)*2, 649 .mode = 0644, 650 .proc_handler = ipv4_ping_group_range, 651 }, 652 #ifdef CONFIG_NET_L3_MASTER_DEV 653 { 654 .procname = "raw_l3mdev_accept", 655 .data = &init_net.ipv4.sysctl_raw_l3mdev_accept, 656 .maxlen = sizeof(int), 657 .mode = 0644, 658 .proc_handler = proc_dointvec_minmax, 659 .extra1 = SYSCTL_ZERO, 660 .extra2 = SYSCTL_ONE, 661 }, 662 #endif 663 { 664 .procname = "tcp_ecn", 665 .data = &init_net.ipv4.sysctl_tcp_ecn, 666 .maxlen = sizeof(int), 667 .mode = 0644, 668 .proc_handler = proc_dointvec 669 }, 670 { 671 .procname = "tcp_ecn_fallback", 672 .data = &init_net.ipv4.sysctl_tcp_ecn_fallback, 673 .maxlen = sizeof(int), 674 .mode = 0644, 675 .proc_handler = proc_dointvec 676 }, 677 { 678 .procname = "ip_dynaddr", 679 .data = &init_net.ipv4.sysctl_ip_dynaddr, 680 .maxlen = sizeof(int), 681 .mode = 0644, 682 .proc_handler = proc_dointvec 683 }, 684 { 685 .procname = "ip_early_demux", 686 .data = &init_net.ipv4.sysctl_ip_early_demux, 687 .maxlen = sizeof(int), 688 .mode = 0644, 689 .proc_handler = proc_dointvec 690 }, 691 { 692 .procname = "udp_early_demux", 693 .data = &init_net.ipv4.sysctl_udp_early_demux, 694 .maxlen = sizeof(int), 695 .mode = 0644, 696 .proc_handler = proc_udp_early_demux 697 }, 698 { 699 .procname = "tcp_early_demux", 700 .data = &init_net.ipv4.sysctl_tcp_early_demux, 701 .maxlen = sizeof(int), 702 .mode = 0644, 703 .proc_handler = proc_tcp_early_demux 704 }, 705 { 706 .procname = "nexthop_compat_mode", 707 .data = &init_net.ipv4.sysctl_nexthop_compat_mode, 708 .maxlen = sizeof(int), 709 .mode = 0644, 710 .proc_handler = proc_dointvec_minmax, 711 .extra1 = SYSCTL_ZERO, 712 .extra2 = SYSCTL_ONE, 713 }, 714 { 715 .procname = "ip_default_ttl", 716 .data = &init_net.ipv4.sysctl_ip_default_ttl, 717 .maxlen = sizeof(int), 718 .mode = 0644, 719 .proc_handler = proc_dointvec_minmax, 720 .extra1 = &ip_ttl_min, 721 .extra2 = &ip_ttl_max, 722 }, 723 { 724 .procname = "ip_local_port_range", 725 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range), 726 .data = &init_net.ipv4.ip_local_ports.range, 727 .mode = 0644, 728 .proc_handler = ipv4_local_port_range, 729 }, 730 { 731 .procname = "ip_local_reserved_ports", 732 .data = &init_net.ipv4.sysctl_local_reserved_ports, 733 .maxlen = 65536, 734 .mode = 0644, 735 .proc_handler = proc_do_large_bitmap, 736 }, 737 { 738 .procname = "ip_no_pmtu_disc", 739 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc, 740 .maxlen = sizeof(int), 741 .mode = 0644, 742 .proc_handler = proc_dointvec 743 }, 744 { 745 .procname = "ip_forward_use_pmtu", 746 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu, 747 .maxlen = sizeof(int), 748 .mode = 0644, 749 .proc_handler = proc_dointvec, 750 }, 751 { 752 .procname = "ip_forward_update_priority", 753 .data = &init_net.ipv4.sysctl_ip_fwd_update_priority, 754 .maxlen = sizeof(int), 755 .mode = 0644, 756 .proc_handler = ipv4_fwd_update_priority, 757 .extra1 = SYSCTL_ZERO, 758 .extra2 = SYSCTL_ONE, 759 }, 760 { 761 .procname = "ip_nonlocal_bind", 762 .data = &init_net.ipv4.sysctl_ip_nonlocal_bind, 763 .maxlen = sizeof(int), 764 .mode = 0644, 765 .proc_handler = proc_dointvec 766 }, 767 { 768 .procname = "ip_autobind_reuse", 769 .data = &init_net.ipv4.sysctl_ip_autobind_reuse, 770 .maxlen = sizeof(int), 771 .mode = 0644, 772 .proc_handler = proc_dointvec_minmax, 773 .extra1 = SYSCTL_ZERO, 774 .extra2 = SYSCTL_ONE, 775 }, 776 { 777 .procname = "fwmark_reflect", 778 .data = &init_net.ipv4.sysctl_fwmark_reflect, 779 .maxlen = sizeof(int), 780 .mode = 0644, 781 .proc_handler = proc_dointvec, 782 }, 783 { 784 .procname = "tcp_fwmark_accept", 785 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept, 786 .maxlen = sizeof(int), 787 .mode = 0644, 788 .proc_handler = proc_dointvec, 789 }, 790 #ifdef CONFIG_NET_L3_MASTER_DEV 791 { 792 .procname = "tcp_l3mdev_accept", 793 .data = &init_net.ipv4.sysctl_tcp_l3mdev_accept, 794 .maxlen = sizeof(int), 795 .mode = 0644, 796 .proc_handler = proc_dointvec_minmax, 797 .extra1 = SYSCTL_ZERO, 798 .extra2 = SYSCTL_ONE, 799 }, 800 #endif 801 { 802 .procname = "tcp_mtu_probing", 803 .data = &init_net.ipv4.sysctl_tcp_mtu_probing, 804 .maxlen = sizeof(int), 805 .mode = 0644, 806 .proc_handler = proc_dointvec, 807 }, 808 { 809 .procname = "tcp_base_mss", 810 .data = &init_net.ipv4.sysctl_tcp_base_mss, 811 .maxlen = sizeof(int), 812 .mode = 0644, 813 .proc_handler = proc_dointvec, 814 }, 815 { 816 .procname = "tcp_min_snd_mss", 817 .data = &init_net.ipv4.sysctl_tcp_min_snd_mss, 818 .maxlen = sizeof(int), 819 .mode = 0644, 820 .proc_handler = proc_dointvec_minmax, 821 .extra1 = &tcp_min_snd_mss_min, 822 .extra2 = &tcp_min_snd_mss_max, 823 }, 824 { 825 .procname = "tcp_mtu_probe_floor", 826 .data = &init_net.ipv4.sysctl_tcp_mtu_probe_floor, 827 .maxlen = sizeof(int), 828 .mode = 0644, 829 .proc_handler = proc_dointvec_minmax, 830 .extra1 = &tcp_min_snd_mss_min, 831 .extra2 = &tcp_min_snd_mss_max, 832 }, 833 { 834 .procname = "tcp_probe_threshold", 835 .data = &init_net.ipv4.sysctl_tcp_probe_threshold, 836 .maxlen = sizeof(int), 837 .mode = 0644, 838 .proc_handler = proc_dointvec, 839 }, 840 { 841 .procname = "tcp_probe_interval", 842 .data = &init_net.ipv4.sysctl_tcp_probe_interval, 843 .maxlen = sizeof(u32), 844 .mode = 0644, 845 .proc_handler = proc_douintvec_minmax, 846 .extra2 = &u32_max_div_HZ, 847 }, 848 { 849 .procname = "igmp_link_local_mcast_reports", 850 .data = &init_net.ipv4.sysctl_igmp_llm_reports, 851 .maxlen = sizeof(int), 852 .mode = 0644, 853 .proc_handler = proc_dointvec 854 }, 855 { 856 .procname = "igmp_max_memberships", 857 .data = &init_net.ipv4.sysctl_igmp_max_memberships, 858 .maxlen = sizeof(int), 859 .mode = 0644, 860 .proc_handler = proc_dointvec 861 }, 862 { 863 .procname = "igmp_max_msf", 864 .data = &init_net.ipv4.sysctl_igmp_max_msf, 865 .maxlen = sizeof(int), 866 .mode = 0644, 867 .proc_handler = proc_dointvec 868 }, 869 #ifdef CONFIG_IP_MULTICAST 870 { 871 .procname = "igmp_qrv", 872 .data = &init_net.ipv4.sysctl_igmp_qrv, 873 .maxlen = sizeof(int), 874 .mode = 0644, 875 .proc_handler = proc_dointvec_minmax, 876 .extra1 = SYSCTL_ONE 877 }, 878 #endif 879 { 880 .procname = "tcp_congestion_control", 881 .data = &init_net.ipv4.tcp_congestion_control, 882 .mode = 0644, 883 .maxlen = TCP_CA_NAME_MAX, 884 .proc_handler = proc_tcp_congestion_control, 885 }, 886 { 887 .procname = "tcp_available_congestion_control", 888 .maxlen = TCP_CA_BUF_MAX, 889 .mode = 0444, 890 .proc_handler = proc_tcp_available_congestion_control, 891 }, 892 { 893 .procname = "tcp_allowed_congestion_control", 894 .maxlen = TCP_CA_BUF_MAX, 895 .mode = 0644, 896 .proc_handler = proc_allowed_congestion_control, 897 }, 898 { 899 .procname = "tcp_keepalive_time", 900 .data = &init_net.ipv4.sysctl_tcp_keepalive_time, 901 .maxlen = sizeof(int), 902 .mode = 0644, 903 .proc_handler = proc_dointvec_jiffies, 904 }, 905 { 906 .procname = "tcp_keepalive_probes", 907 .data = &init_net.ipv4.sysctl_tcp_keepalive_probes, 908 .maxlen = sizeof(int), 909 .mode = 0644, 910 .proc_handler = proc_dointvec 911 }, 912 { 913 .procname = "tcp_keepalive_intvl", 914 .data = &init_net.ipv4.sysctl_tcp_keepalive_intvl, 915 .maxlen = sizeof(int), 916 .mode = 0644, 917 .proc_handler = proc_dointvec_jiffies, 918 }, 919 { 920 .procname = "tcp_syn_retries", 921 .data = &init_net.ipv4.sysctl_tcp_syn_retries, 922 .maxlen = sizeof(int), 923 .mode = 0644, 924 .proc_handler = proc_dointvec_minmax, 925 .extra1 = &tcp_syn_retries_min, 926 .extra2 = &tcp_syn_retries_max 927 }, 928 { 929 .procname = "tcp_synack_retries", 930 .data = &init_net.ipv4.sysctl_tcp_synack_retries, 931 .maxlen = sizeof(int), 932 .mode = 0644, 933 .proc_handler = proc_dointvec 934 }, 935 #ifdef CONFIG_SYN_COOKIES 936 { 937 .procname = "tcp_syncookies", 938 .data = &init_net.ipv4.sysctl_tcp_syncookies, 939 .maxlen = sizeof(int), 940 .mode = 0644, 941 .proc_handler = proc_dointvec 942 }, 943 #endif 944 { 945 .procname = "tcp_reordering", 946 .data = &init_net.ipv4.sysctl_tcp_reordering, 947 .maxlen = sizeof(int), 948 .mode = 0644, 949 .proc_handler = proc_dointvec 950 }, 951 { 952 .procname = "tcp_retries1", 953 .data = &init_net.ipv4.sysctl_tcp_retries1, 954 .maxlen = sizeof(int), 955 .mode = 0644, 956 .proc_handler = proc_dointvec_minmax, 957 .extra2 = &tcp_retr1_max 958 }, 959 { 960 .procname = "tcp_retries2", 961 .data = &init_net.ipv4.sysctl_tcp_retries2, 962 .maxlen = sizeof(int), 963 .mode = 0644, 964 .proc_handler = proc_dointvec 965 }, 966 { 967 .procname = "tcp_orphan_retries", 968 .data = &init_net.ipv4.sysctl_tcp_orphan_retries, 969 .maxlen = sizeof(int), 970 .mode = 0644, 971 .proc_handler = proc_dointvec 972 }, 973 { 974 .procname = "tcp_fin_timeout", 975 .data = &init_net.ipv4.sysctl_tcp_fin_timeout, 976 .maxlen = sizeof(int), 977 .mode = 0644, 978 .proc_handler = proc_dointvec_jiffies, 979 }, 980 { 981 .procname = "tcp_notsent_lowat", 982 .data = &init_net.ipv4.sysctl_tcp_notsent_lowat, 983 .maxlen = sizeof(unsigned int), 984 .mode = 0644, 985 .proc_handler = proc_douintvec, 986 }, 987 { 988 .procname = "tcp_tw_reuse", 989 .data = &init_net.ipv4.sysctl_tcp_tw_reuse, 990 .maxlen = sizeof(int), 991 .mode = 0644, 992 .proc_handler = proc_dointvec_minmax, 993 .extra1 = SYSCTL_ZERO, 994 .extra2 = &two, 995 }, 996 { 997 .procname = "tcp_max_tw_buckets", 998 .data = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, 999 .maxlen = sizeof(int), 1000 .mode = 0644, 1001 .proc_handler = proc_dointvec 1002 }, 1003 { 1004 .procname = "tcp_max_syn_backlog", 1005 .data = &init_net.ipv4.sysctl_max_syn_backlog, 1006 .maxlen = sizeof(int), 1007 .mode = 0644, 1008 .proc_handler = proc_dointvec 1009 }, 1010 { 1011 .procname = "tcp_fastopen", 1012 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1013 .maxlen = sizeof(int), 1014 .mode = 0644, 1015 .proc_handler = proc_dointvec, 1016 }, 1017 { 1018 .procname = "tcp_fastopen_key", 1019 .mode = 0600, 1020 .data = &init_net.ipv4.sysctl_tcp_fastopen, 1021 /* maxlen to print the list of keys in hex (*2), with dashes 1022 * separating doublewords and a comma in between keys. 1023 */ 1024 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 1025 2 * TCP_FASTOPEN_KEY_MAX) + 1026 (TCP_FASTOPEN_KEY_MAX * 5)), 1027 .proc_handler = proc_tcp_fastopen_key, 1028 }, 1029 { 1030 .procname = "tcp_fastopen_blackhole_timeout_sec", 1031 .data = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout, 1032 .maxlen = sizeof(int), 1033 .mode = 0644, 1034 .proc_handler = proc_tfo_blackhole_detect_timeout, 1035 .extra1 = SYSCTL_ZERO, 1036 }, 1037 #ifdef CONFIG_IP_ROUTE_MULTIPATH 1038 { 1039 .procname = "fib_multipath_use_neigh", 1040 .data = &init_net.ipv4.sysctl_fib_multipath_use_neigh, 1041 .maxlen = sizeof(int), 1042 .mode = 0644, 1043 .proc_handler = proc_dointvec_minmax, 1044 .extra1 = SYSCTL_ZERO, 1045 .extra2 = SYSCTL_ONE, 1046 }, 1047 { 1048 .procname = "fib_multipath_hash_policy", 1049 .data = &init_net.ipv4.sysctl_fib_multipath_hash_policy, 1050 .maxlen = sizeof(int), 1051 .mode = 0644, 1052 .proc_handler = proc_fib_multipath_hash_policy, 1053 .extra1 = SYSCTL_ZERO, 1054 .extra2 = &two, 1055 }, 1056 #endif 1057 { 1058 .procname = "ip_unprivileged_port_start", 1059 .maxlen = sizeof(int), 1060 .data = &init_net.ipv4.sysctl_ip_prot_sock, 1061 .mode = 0644, 1062 .proc_handler = ipv4_privileged_ports, 1063 }, 1064 #ifdef CONFIG_NET_L3_MASTER_DEV 1065 { 1066 .procname = "udp_l3mdev_accept", 1067 .data = &init_net.ipv4.sysctl_udp_l3mdev_accept, 1068 .maxlen = sizeof(int), 1069 .mode = 0644, 1070 .proc_handler = proc_dointvec_minmax, 1071 .extra1 = SYSCTL_ZERO, 1072 .extra2 = SYSCTL_ONE, 1073 }, 1074 #endif 1075 { 1076 .procname = "tcp_sack", 1077 .data = &init_net.ipv4.sysctl_tcp_sack, 1078 .maxlen = sizeof(int), 1079 .mode = 0644, 1080 .proc_handler = proc_dointvec 1081 }, 1082 { 1083 .procname = "tcp_window_scaling", 1084 .data = &init_net.ipv4.sysctl_tcp_window_scaling, 1085 .maxlen = sizeof(int), 1086 .mode = 0644, 1087 .proc_handler = proc_dointvec 1088 }, 1089 { 1090 .procname = "tcp_timestamps", 1091 .data = &init_net.ipv4.sysctl_tcp_timestamps, 1092 .maxlen = sizeof(int), 1093 .mode = 0644, 1094 .proc_handler = proc_dointvec 1095 }, 1096 { 1097 .procname = "tcp_early_retrans", 1098 .data = &init_net.ipv4.sysctl_tcp_early_retrans, 1099 .maxlen = sizeof(int), 1100 .mode = 0644, 1101 .proc_handler = proc_dointvec_minmax, 1102 .extra1 = SYSCTL_ZERO, 1103 .extra2 = &four, 1104 }, 1105 { 1106 .procname = "tcp_recovery", 1107 .data = &init_net.ipv4.sysctl_tcp_recovery, 1108 .maxlen = sizeof(int), 1109 .mode = 0644, 1110 .proc_handler = proc_dointvec, 1111 }, 1112 { 1113 .procname = "tcp_thin_linear_timeouts", 1114 .data = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts, 1115 .maxlen = sizeof(int), 1116 .mode = 0644, 1117 .proc_handler = proc_dointvec 1118 }, 1119 { 1120 .procname = "tcp_slow_start_after_idle", 1121 .data = &init_net.ipv4.sysctl_tcp_slow_start_after_idle, 1122 .maxlen = sizeof(int), 1123 .mode = 0644, 1124 .proc_handler = proc_dointvec 1125 }, 1126 { 1127 .procname = "tcp_retrans_collapse", 1128 .data = &init_net.ipv4.sysctl_tcp_retrans_collapse, 1129 .maxlen = sizeof(int), 1130 .mode = 0644, 1131 .proc_handler = proc_dointvec 1132 }, 1133 { 1134 .procname = "tcp_stdurg", 1135 .data = &init_net.ipv4.sysctl_tcp_stdurg, 1136 .maxlen = sizeof(int), 1137 .mode = 0644, 1138 .proc_handler = proc_dointvec 1139 }, 1140 { 1141 .procname = "tcp_rfc1337", 1142 .data = &init_net.ipv4.sysctl_tcp_rfc1337, 1143 .maxlen = sizeof(int), 1144 .mode = 0644, 1145 .proc_handler = proc_dointvec 1146 }, 1147 { 1148 .procname = "tcp_abort_on_overflow", 1149 .data = &init_net.ipv4.sysctl_tcp_abort_on_overflow, 1150 .maxlen = sizeof(int), 1151 .mode = 0644, 1152 .proc_handler = proc_dointvec 1153 }, 1154 { 1155 .procname = "tcp_fack", 1156 .data = &init_net.ipv4.sysctl_tcp_fack, 1157 .maxlen = sizeof(int), 1158 .mode = 0644, 1159 .proc_handler = proc_dointvec 1160 }, 1161 { 1162 .procname = "tcp_max_reordering", 1163 .data = &init_net.ipv4.sysctl_tcp_max_reordering, 1164 .maxlen = sizeof(int), 1165 .mode = 0644, 1166 .proc_handler = proc_dointvec 1167 }, 1168 { 1169 .procname = "tcp_dsack", 1170 .data = &init_net.ipv4.sysctl_tcp_dsack, 1171 .maxlen = sizeof(int), 1172 .mode = 0644, 1173 .proc_handler = proc_dointvec 1174 }, 1175 { 1176 .procname = "tcp_app_win", 1177 .data = &init_net.ipv4.sysctl_tcp_app_win, 1178 .maxlen = sizeof(int), 1179 .mode = 0644, 1180 .proc_handler = proc_dointvec 1181 }, 1182 { 1183 .procname = "tcp_adv_win_scale", 1184 .data = &init_net.ipv4.sysctl_tcp_adv_win_scale, 1185 .maxlen = sizeof(int), 1186 .mode = 0644, 1187 .proc_handler = proc_dointvec_minmax, 1188 .extra1 = &tcp_adv_win_scale_min, 1189 .extra2 = &tcp_adv_win_scale_max, 1190 }, 1191 { 1192 .procname = "tcp_frto", 1193 .data = &init_net.ipv4.sysctl_tcp_frto, 1194 .maxlen = sizeof(int), 1195 .mode = 0644, 1196 .proc_handler = proc_dointvec 1197 }, 1198 { 1199 .procname = "tcp_no_metrics_save", 1200 .data = &init_net.ipv4.sysctl_tcp_nometrics_save, 1201 .maxlen = sizeof(int), 1202 .mode = 0644, 1203 .proc_handler = proc_dointvec, 1204 }, 1205 { 1206 .procname = "tcp_no_ssthresh_metrics_save", 1207 .data = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save, 1208 .maxlen = sizeof(int), 1209 .mode = 0644, 1210 .proc_handler = proc_dointvec_minmax, 1211 .extra1 = SYSCTL_ZERO, 1212 .extra2 = SYSCTL_ONE, 1213 }, 1214 { 1215 .procname = "tcp_moderate_rcvbuf", 1216 .data = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf, 1217 .maxlen = sizeof(int), 1218 .mode = 0644, 1219 .proc_handler = proc_dointvec, 1220 }, 1221 { 1222 .procname = "tcp_tso_win_divisor", 1223 .data = &init_net.ipv4.sysctl_tcp_tso_win_divisor, 1224 .maxlen = sizeof(int), 1225 .mode = 0644, 1226 .proc_handler = proc_dointvec, 1227 }, 1228 { 1229 .procname = "tcp_workaround_signed_windows", 1230 .data = &init_net.ipv4.sysctl_tcp_workaround_signed_windows, 1231 .maxlen = sizeof(int), 1232 .mode = 0644, 1233 .proc_handler = proc_dointvec 1234 }, 1235 { 1236 .procname = "tcp_limit_output_bytes", 1237 .data = &init_net.ipv4.sysctl_tcp_limit_output_bytes, 1238 .maxlen = sizeof(int), 1239 .mode = 0644, 1240 .proc_handler = proc_dointvec 1241 }, 1242 { 1243 .procname = "tcp_challenge_ack_limit", 1244 .data = &init_net.ipv4.sysctl_tcp_challenge_ack_limit, 1245 .maxlen = sizeof(int), 1246 .mode = 0644, 1247 .proc_handler = proc_dointvec 1248 }, 1249 { 1250 .procname = "tcp_min_tso_segs", 1251 .data = &init_net.ipv4.sysctl_tcp_min_tso_segs, 1252 .maxlen = sizeof(int), 1253 .mode = 0644, 1254 .proc_handler = proc_dointvec_minmax, 1255 .extra1 = SYSCTL_ONE, 1256 .extra2 = &gso_max_segs, 1257 }, 1258 { 1259 .procname = "tcp_min_rtt_wlen", 1260 .data = &init_net.ipv4.sysctl_tcp_min_rtt_wlen, 1261 .maxlen = sizeof(int), 1262 .mode = 0644, 1263 .proc_handler = proc_dointvec_minmax, 1264 .extra1 = SYSCTL_ZERO, 1265 .extra2 = &one_day_secs 1266 }, 1267 { 1268 .procname = "tcp_autocorking", 1269 .data = &init_net.ipv4.sysctl_tcp_autocorking, 1270 .maxlen = sizeof(int), 1271 .mode = 0644, 1272 .proc_handler = proc_dointvec_minmax, 1273 .extra1 = SYSCTL_ZERO, 1274 .extra2 = SYSCTL_ONE, 1275 }, 1276 { 1277 .procname = "tcp_invalid_ratelimit", 1278 .data = &init_net.ipv4.sysctl_tcp_invalid_ratelimit, 1279 .maxlen = sizeof(int), 1280 .mode = 0644, 1281 .proc_handler = proc_dointvec_ms_jiffies, 1282 }, 1283 { 1284 .procname = "tcp_pacing_ss_ratio", 1285 .data = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio, 1286 .maxlen = sizeof(int), 1287 .mode = 0644, 1288 .proc_handler = proc_dointvec_minmax, 1289 .extra1 = SYSCTL_ZERO, 1290 .extra2 = &thousand, 1291 }, 1292 { 1293 .procname = "tcp_pacing_ca_ratio", 1294 .data = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio, 1295 .maxlen = sizeof(int), 1296 .mode = 0644, 1297 .proc_handler = proc_dointvec_minmax, 1298 .extra1 = SYSCTL_ZERO, 1299 .extra2 = &thousand, 1300 }, 1301 { 1302 .procname = "tcp_wmem", 1303 .data = &init_net.ipv4.sysctl_tcp_wmem, 1304 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_wmem), 1305 .mode = 0644, 1306 .proc_handler = proc_dointvec_minmax, 1307 .extra1 = SYSCTL_ONE, 1308 }, 1309 { 1310 .procname = "tcp_rmem", 1311 .data = &init_net.ipv4.sysctl_tcp_rmem, 1312 .maxlen = sizeof(init_net.ipv4.sysctl_tcp_rmem), 1313 .mode = 0644, 1314 .proc_handler = proc_dointvec_minmax, 1315 .extra1 = SYSCTL_ONE, 1316 }, 1317 { 1318 .procname = "tcp_comp_sack_delay_ns", 1319 .data = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns, 1320 .maxlen = sizeof(unsigned long), 1321 .mode = 0644, 1322 .proc_handler = proc_doulongvec_minmax, 1323 }, 1324 { 1325 .procname = "tcp_comp_sack_slack_ns", 1326 .data = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns, 1327 .maxlen = sizeof(unsigned long), 1328 .mode = 0644, 1329 .proc_handler = proc_doulongvec_minmax, 1330 }, 1331 { 1332 .procname = "tcp_comp_sack_nr", 1333 .data = &init_net.ipv4.sysctl_tcp_comp_sack_nr, 1334 .maxlen = sizeof(int), 1335 .mode = 0644, 1336 .proc_handler = proc_dointvec_minmax, 1337 .extra1 = SYSCTL_ZERO, 1338 .extra2 = &comp_sack_nr_max, 1339 }, 1340 { 1341 .procname = "udp_rmem_min", 1342 .data = &init_net.ipv4.sysctl_udp_rmem_min, 1343 .maxlen = sizeof(init_net.ipv4.sysctl_udp_rmem_min), 1344 .mode = 0644, 1345 .proc_handler = proc_dointvec_minmax, 1346 .extra1 = SYSCTL_ONE 1347 }, 1348 { 1349 .procname = "udp_wmem_min", 1350 .data = &init_net.ipv4.sysctl_udp_wmem_min, 1351 .maxlen = sizeof(init_net.ipv4.sysctl_udp_wmem_min), 1352 .mode = 0644, 1353 .proc_handler = proc_dointvec_minmax, 1354 .extra1 = SYSCTL_ONE 1355 }, 1356 { } 1357 }; 1358 1359 static __net_init int ipv4_sysctl_init_net(struct net *net) 1360 { 1361 struct ctl_table *table; 1362 1363 table = ipv4_net_table; 1364 if (!net_eq(net, &init_net)) { 1365 int i; 1366 1367 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); 1368 if (!table) 1369 goto err_alloc; 1370 1371 /* Update the variables to point into the current struct net */ 1372 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) 1373 table[i].data += (void *)net - (void *)&init_net; 1374 } 1375 1376 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table); 1377 if (!net->ipv4.ipv4_hdr) 1378 goto err_reg; 1379 1380 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 1381 if (!net->ipv4.sysctl_local_reserved_ports) 1382 goto err_ports; 1383 1384 return 0; 1385 1386 err_ports: 1387 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1388 err_reg: 1389 if (!net_eq(net, &init_net)) 1390 kfree(table); 1391 err_alloc: 1392 return -ENOMEM; 1393 } 1394 1395 static __net_exit void ipv4_sysctl_exit_net(struct net *net) 1396 { 1397 struct ctl_table *table; 1398 1399 kfree(net->ipv4.sysctl_local_reserved_ports); 1400 table = net->ipv4.ipv4_hdr->ctl_table_arg; 1401 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 1402 kfree(table); 1403 } 1404 1405 static __net_initdata struct pernet_operations ipv4_sysctl_ops = { 1406 .init = ipv4_sysctl_init_net, 1407 .exit = ipv4_sysctl_exit_net, 1408 }; 1409 1410 static __init int sysctl_ipv4_init(void) 1411 { 1412 struct ctl_table_header *hdr; 1413 1414 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table); 1415 if (!hdr) 1416 return -ENOMEM; 1417 1418 if (register_pernet_subsys(&ipv4_sysctl_ops)) { 1419 unregister_net_sysctl_table(hdr); 1420 return -ENOMEM; 1421 } 1422 1423 return 0; 1424 } 1425 1426 __initcall(sysctl_ipv4_init); 1427