1 /* 2 * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem. 3 * 4 * Begun April 1, 1996, Mike Shaver. 5 * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS] 6 */ 7 8 #include <linux/mm.h> 9 #include <linux/module.h> 10 #include <linux/sysctl.h> 11 #include <linux/igmp.h> 12 #include <linux/inetdevice.h> 13 #include <linux/seqlock.h> 14 #include <linux/init.h> 15 #include <linux/slab.h> 16 #include <linux/nsproxy.h> 17 #include <linux/swap.h> 18 #include <net/snmp.h> 19 #include <net/icmp.h> 20 #include <net/ip.h> 21 #include <net/route.h> 22 #include <net/tcp.h> 23 #include <net/udp.h> 24 #include <net/cipso_ipv4.h> 25 #include <net/inet_frag.h> 26 #include <net/ping.h> 27 #include <net/tcp_memcontrol.h> 28 29 static int zero; 30 static int one = 1; 31 static int four = 4; 32 static int gso_max_segs = GSO_MAX_SEGS; 33 static int tcp_retr1_max = 255; 34 static int ip_local_port_range_min[] = { 1, 1 }; 35 static int ip_local_port_range_max[] = { 65535, 65535 }; 36 static int tcp_adv_win_scale_min = -31; 37 static int tcp_adv_win_scale_max = 31; 38 static int ip_ttl_min = 1; 39 static int ip_ttl_max = 255; 40 static int tcp_syn_retries_min = 1; 41 static int tcp_syn_retries_max = MAX_TCP_SYNCNT; 42 static int ip_ping_group_range_min[] = { 0, 0 }; 43 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX }; 44 45 /* Update system visible IP port range */ 46 static void set_local_port_range(struct net *net, int range[2]) 47 { 48 write_seqlock(&net->ipv4.ip_local_ports.lock); 49 net->ipv4.ip_local_ports.range[0] = range[0]; 50 net->ipv4.ip_local_ports.range[1] = range[1]; 51 write_sequnlock(&net->ipv4.ip_local_ports.lock); 52 } 53 54 /* Validate changes from /proc interface. */ 55 static int ipv4_local_port_range(struct ctl_table *table, int write, 56 void __user *buffer, 57 size_t *lenp, loff_t *ppos) 58 { 59 struct net *net = 60 container_of(table->data, struct net, ipv4.ip_local_ports.range); 61 int ret; 62 int range[2]; 63 struct ctl_table tmp = { 64 .data = &range, 65 .maxlen = sizeof(range), 66 .mode = table->mode, 67 .extra1 = &ip_local_port_range_min, 68 .extra2 = &ip_local_port_range_max, 69 }; 70 71 inet_get_local_port_range(net, &range[0], &range[1]); 72 73 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 74 75 if (write && ret == 0) { 76 if (range[1] < range[0]) 77 ret = -EINVAL; 78 else 79 set_local_port_range(net, range); 80 } 81 82 return ret; 83 } 84 85 86 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high) 87 { 88 kgid_t *data = table->data; 89 struct net *net = 90 container_of(table->data, struct net, ipv4.ping_group_range.range); 91 unsigned int seq; 92 do { 93 seq = read_seqbegin(&net->ipv4.ip_local_ports.lock); 94 95 *low = data[0]; 96 *high = data[1]; 97 } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq)); 98 } 99 100 /* Update system visible IP port range */ 101 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high) 102 { 103 kgid_t *data = table->data; 104 struct net *net = 105 container_of(table->data, struct net, ipv4.ping_group_range.range); 106 write_seqlock(&net->ipv4.ip_local_ports.lock); 107 data[0] = low; 108 data[1] = high; 109 write_sequnlock(&net->ipv4.ip_local_ports.lock); 110 } 111 112 /* Validate changes from /proc interface. */ 113 static int ipv4_ping_group_range(struct ctl_table *table, int write, 114 void __user *buffer, 115 size_t *lenp, loff_t *ppos) 116 { 117 struct user_namespace *user_ns = current_user_ns(); 118 int ret; 119 gid_t urange[2]; 120 kgid_t low, high; 121 struct ctl_table tmp = { 122 .data = &urange, 123 .maxlen = sizeof(urange), 124 .mode = table->mode, 125 .extra1 = &ip_ping_group_range_min, 126 .extra2 = &ip_ping_group_range_max, 127 }; 128 129 inet_get_ping_group_range_table(table, &low, &high); 130 urange[0] = from_kgid_munged(user_ns, low); 131 urange[1] = from_kgid_munged(user_ns, high); 132 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); 133 134 if (write && ret == 0) { 135 low = make_kgid(user_ns, urange[0]); 136 high = make_kgid(user_ns, urange[1]); 137 if (!gid_valid(low) || !gid_valid(high) || 138 (urange[1] < urange[0]) || gid_lt(high, low)) { 139 low = make_kgid(&init_user_ns, 1); 140 high = make_kgid(&init_user_ns, 0); 141 } 142 set_ping_group_range(table, low, high); 143 } 144 145 return ret; 146 } 147 148 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write, 149 void __user *buffer, size_t *lenp, loff_t *ppos) 150 { 151 char val[TCP_CA_NAME_MAX]; 152 struct ctl_table tbl = { 153 .data = val, 154 .maxlen = TCP_CA_NAME_MAX, 155 }; 156 int ret; 157 158 tcp_get_default_congestion_control(val); 159 160 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 161 if (write && ret == 0) 162 ret = tcp_set_default_congestion_control(val); 163 return ret; 164 } 165 166 static int proc_tcp_available_congestion_control(struct ctl_table *ctl, 167 int write, 168 void __user *buffer, size_t *lenp, 169 loff_t *ppos) 170 { 171 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, }; 172 int ret; 173 174 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 175 if (!tbl.data) 176 return -ENOMEM; 177 tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX); 178 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 179 kfree(tbl.data); 180 return ret; 181 } 182 183 static int proc_allowed_congestion_control(struct ctl_table *ctl, 184 int write, 185 void __user *buffer, size_t *lenp, 186 loff_t *ppos) 187 { 188 struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX }; 189 int ret; 190 191 tbl.data = kmalloc(tbl.maxlen, GFP_USER); 192 if (!tbl.data) 193 return -ENOMEM; 194 195 tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen); 196 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 197 if (write && ret == 0) 198 ret = tcp_set_allowed_congestion_control(tbl.data); 199 kfree(tbl.data); 200 return ret; 201 } 202 203 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write, 204 void __user *buffer, size_t *lenp, 205 loff_t *ppos) 206 { 207 struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) }; 208 struct tcp_fastopen_context *ctxt; 209 int ret; 210 u32 user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */ 211 212 tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL); 213 if (!tbl.data) 214 return -ENOMEM; 215 216 rcu_read_lock(); 217 ctxt = rcu_dereference(tcp_fastopen_ctx); 218 if (ctxt) 219 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH); 220 else 221 memset(user_key, 0, sizeof(user_key)); 222 rcu_read_unlock(); 223 224 snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x", 225 user_key[0], user_key[1], user_key[2], user_key[3]); 226 ret = proc_dostring(&tbl, write, buffer, lenp, ppos); 227 228 if (write && ret == 0) { 229 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1, 230 user_key + 2, user_key + 3) != 4) { 231 ret = -EINVAL; 232 goto bad_key; 233 } 234 /* Generate a dummy secret but don't publish it. This 235 * is needed so we don't regenerate a new key on the 236 * first invocation of tcp_fastopen_cookie_gen 237 */ 238 tcp_fastopen_init_key_once(false); 239 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH); 240 } 241 242 bad_key: 243 pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n", 244 user_key[0], user_key[1], user_key[2], user_key[3], 245 (char *)tbl.data, ret); 246 kfree(tbl.data); 247 return ret; 248 } 249 250 static struct ctl_table ipv4_table[] = { 251 { 252 .procname = "tcp_timestamps", 253 .data = &sysctl_tcp_timestamps, 254 .maxlen = sizeof(int), 255 .mode = 0644, 256 .proc_handler = proc_dointvec 257 }, 258 { 259 .procname = "tcp_window_scaling", 260 .data = &sysctl_tcp_window_scaling, 261 .maxlen = sizeof(int), 262 .mode = 0644, 263 .proc_handler = proc_dointvec 264 }, 265 { 266 .procname = "tcp_sack", 267 .data = &sysctl_tcp_sack, 268 .maxlen = sizeof(int), 269 .mode = 0644, 270 .proc_handler = proc_dointvec 271 }, 272 { 273 .procname = "tcp_retrans_collapse", 274 .data = &sysctl_tcp_retrans_collapse, 275 .maxlen = sizeof(int), 276 .mode = 0644, 277 .proc_handler = proc_dointvec 278 }, 279 { 280 .procname = "ip_default_ttl", 281 .data = &sysctl_ip_default_ttl, 282 .maxlen = sizeof(int), 283 .mode = 0644, 284 .proc_handler = proc_dointvec_minmax, 285 .extra1 = &ip_ttl_min, 286 .extra2 = &ip_ttl_max, 287 }, 288 { 289 .procname = "ip_nonlocal_bind", 290 .data = &sysctl_ip_nonlocal_bind, 291 .maxlen = sizeof(int), 292 .mode = 0644, 293 .proc_handler = proc_dointvec 294 }, 295 { 296 .procname = "tcp_syn_retries", 297 .data = &sysctl_tcp_syn_retries, 298 .maxlen = sizeof(int), 299 .mode = 0644, 300 .proc_handler = proc_dointvec_minmax, 301 .extra1 = &tcp_syn_retries_min, 302 .extra2 = &tcp_syn_retries_max 303 }, 304 { 305 .procname = "tcp_synack_retries", 306 .data = &sysctl_tcp_synack_retries, 307 .maxlen = sizeof(int), 308 .mode = 0644, 309 .proc_handler = proc_dointvec 310 }, 311 { 312 .procname = "tcp_max_orphans", 313 .data = &sysctl_tcp_max_orphans, 314 .maxlen = sizeof(int), 315 .mode = 0644, 316 .proc_handler = proc_dointvec 317 }, 318 { 319 .procname = "tcp_max_tw_buckets", 320 .data = &tcp_death_row.sysctl_max_tw_buckets, 321 .maxlen = sizeof(int), 322 .mode = 0644, 323 .proc_handler = proc_dointvec 324 }, 325 { 326 .procname = "ip_early_demux", 327 .data = &sysctl_ip_early_demux, 328 .maxlen = sizeof(int), 329 .mode = 0644, 330 .proc_handler = proc_dointvec 331 }, 332 { 333 .procname = "ip_dynaddr", 334 .data = &sysctl_ip_dynaddr, 335 .maxlen = sizeof(int), 336 .mode = 0644, 337 .proc_handler = proc_dointvec 338 }, 339 { 340 .procname = "tcp_keepalive_time", 341 .data = &sysctl_tcp_keepalive_time, 342 .maxlen = sizeof(int), 343 .mode = 0644, 344 .proc_handler = proc_dointvec_jiffies, 345 }, 346 { 347 .procname = "tcp_keepalive_probes", 348 .data = &sysctl_tcp_keepalive_probes, 349 .maxlen = sizeof(int), 350 .mode = 0644, 351 .proc_handler = proc_dointvec 352 }, 353 { 354 .procname = "tcp_keepalive_intvl", 355 .data = &sysctl_tcp_keepalive_intvl, 356 .maxlen = sizeof(int), 357 .mode = 0644, 358 .proc_handler = proc_dointvec_jiffies, 359 }, 360 { 361 .procname = "tcp_retries1", 362 .data = &sysctl_tcp_retries1, 363 .maxlen = sizeof(int), 364 .mode = 0644, 365 .proc_handler = proc_dointvec_minmax, 366 .extra2 = &tcp_retr1_max 367 }, 368 { 369 .procname = "tcp_retries2", 370 .data = &sysctl_tcp_retries2, 371 .maxlen = sizeof(int), 372 .mode = 0644, 373 .proc_handler = proc_dointvec 374 }, 375 { 376 .procname = "tcp_fin_timeout", 377 .data = &sysctl_tcp_fin_timeout, 378 .maxlen = sizeof(int), 379 .mode = 0644, 380 .proc_handler = proc_dointvec_jiffies, 381 }, 382 #ifdef CONFIG_SYN_COOKIES 383 { 384 .procname = "tcp_syncookies", 385 .data = &sysctl_tcp_syncookies, 386 .maxlen = sizeof(int), 387 .mode = 0644, 388 .proc_handler = proc_dointvec 389 }, 390 #endif 391 { 392 .procname = "tcp_fastopen", 393 .data = &sysctl_tcp_fastopen, 394 .maxlen = sizeof(int), 395 .mode = 0644, 396 .proc_handler = proc_dointvec, 397 }, 398 { 399 .procname = "tcp_fastopen_key", 400 .mode = 0600, 401 .maxlen = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10), 402 .proc_handler = proc_tcp_fastopen_key, 403 }, 404 { 405 .procname = "tcp_tw_recycle", 406 .data = &tcp_death_row.sysctl_tw_recycle, 407 .maxlen = sizeof(int), 408 .mode = 0644, 409 .proc_handler = proc_dointvec 410 }, 411 { 412 .procname = "tcp_abort_on_overflow", 413 .data = &sysctl_tcp_abort_on_overflow, 414 .maxlen = sizeof(int), 415 .mode = 0644, 416 .proc_handler = proc_dointvec 417 }, 418 { 419 .procname = "tcp_stdurg", 420 .data = &sysctl_tcp_stdurg, 421 .maxlen = sizeof(int), 422 .mode = 0644, 423 .proc_handler = proc_dointvec 424 }, 425 { 426 .procname = "tcp_rfc1337", 427 .data = &sysctl_tcp_rfc1337, 428 .maxlen = sizeof(int), 429 .mode = 0644, 430 .proc_handler = proc_dointvec 431 }, 432 { 433 .procname = "tcp_max_syn_backlog", 434 .data = &sysctl_max_syn_backlog, 435 .maxlen = sizeof(int), 436 .mode = 0644, 437 .proc_handler = proc_dointvec 438 }, 439 { 440 .procname = "igmp_max_memberships", 441 .data = &sysctl_igmp_max_memberships, 442 .maxlen = sizeof(int), 443 .mode = 0644, 444 .proc_handler = proc_dointvec 445 }, 446 { 447 .procname = "igmp_max_msf", 448 .data = &sysctl_igmp_max_msf, 449 .maxlen = sizeof(int), 450 .mode = 0644, 451 .proc_handler = proc_dointvec 452 }, 453 { 454 .procname = "inet_peer_threshold", 455 .data = &inet_peer_threshold, 456 .maxlen = sizeof(int), 457 .mode = 0644, 458 .proc_handler = proc_dointvec 459 }, 460 { 461 .procname = "inet_peer_minttl", 462 .data = &inet_peer_minttl, 463 .maxlen = sizeof(int), 464 .mode = 0644, 465 .proc_handler = proc_dointvec_jiffies, 466 }, 467 { 468 .procname = "inet_peer_maxttl", 469 .data = &inet_peer_maxttl, 470 .maxlen = sizeof(int), 471 .mode = 0644, 472 .proc_handler = proc_dointvec_jiffies, 473 }, 474 { 475 .procname = "tcp_orphan_retries", 476 .data = &sysctl_tcp_orphan_retries, 477 .maxlen = sizeof(int), 478 .mode = 0644, 479 .proc_handler = proc_dointvec 480 }, 481 { 482 .procname = "tcp_fack", 483 .data = &sysctl_tcp_fack, 484 .maxlen = sizeof(int), 485 .mode = 0644, 486 .proc_handler = proc_dointvec 487 }, 488 { 489 .procname = "tcp_reordering", 490 .data = &sysctl_tcp_reordering, 491 .maxlen = sizeof(int), 492 .mode = 0644, 493 .proc_handler = proc_dointvec 494 }, 495 { 496 .procname = "tcp_dsack", 497 .data = &sysctl_tcp_dsack, 498 .maxlen = sizeof(int), 499 .mode = 0644, 500 .proc_handler = proc_dointvec 501 }, 502 { 503 .procname = "tcp_mem", 504 .maxlen = sizeof(sysctl_tcp_mem), 505 .data = &sysctl_tcp_mem, 506 .mode = 0644, 507 .proc_handler = proc_doulongvec_minmax, 508 }, 509 { 510 .procname = "tcp_wmem", 511 .data = &sysctl_tcp_wmem, 512 .maxlen = sizeof(sysctl_tcp_wmem), 513 .mode = 0644, 514 .proc_handler = proc_dointvec_minmax, 515 .extra1 = &one, 516 }, 517 { 518 .procname = "tcp_notsent_lowat", 519 .data = &sysctl_tcp_notsent_lowat, 520 .maxlen = sizeof(sysctl_tcp_notsent_lowat), 521 .mode = 0644, 522 .proc_handler = proc_dointvec, 523 }, 524 { 525 .procname = "tcp_rmem", 526 .data = &sysctl_tcp_rmem, 527 .maxlen = sizeof(sysctl_tcp_rmem), 528 .mode = 0644, 529 .proc_handler = proc_dointvec_minmax, 530 .extra1 = &one, 531 }, 532 { 533 .procname = "tcp_app_win", 534 .data = &sysctl_tcp_app_win, 535 .maxlen = sizeof(int), 536 .mode = 0644, 537 .proc_handler = proc_dointvec 538 }, 539 { 540 .procname = "tcp_adv_win_scale", 541 .data = &sysctl_tcp_adv_win_scale, 542 .maxlen = sizeof(int), 543 .mode = 0644, 544 .proc_handler = proc_dointvec_minmax, 545 .extra1 = &tcp_adv_win_scale_min, 546 .extra2 = &tcp_adv_win_scale_max, 547 }, 548 { 549 .procname = "tcp_tw_reuse", 550 .data = &sysctl_tcp_tw_reuse, 551 .maxlen = sizeof(int), 552 .mode = 0644, 553 .proc_handler = proc_dointvec 554 }, 555 { 556 .procname = "tcp_frto", 557 .data = &sysctl_tcp_frto, 558 .maxlen = sizeof(int), 559 .mode = 0644, 560 .proc_handler = proc_dointvec 561 }, 562 { 563 .procname = "tcp_low_latency", 564 .data = &sysctl_tcp_low_latency, 565 .maxlen = sizeof(int), 566 .mode = 0644, 567 .proc_handler = proc_dointvec 568 }, 569 { 570 .procname = "tcp_no_metrics_save", 571 .data = &sysctl_tcp_nometrics_save, 572 .maxlen = sizeof(int), 573 .mode = 0644, 574 .proc_handler = proc_dointvec, 575 }, 576 { 577 .procname = "tcp_moderate_rcvbuf", 578 .data = &sysctl_tcp_moderate_rcvbuf, 579 .maxlen = sizeof(int), 580 .mode = 0644, 581 .proc_handler = proc_dointvec, 582 }, 583 { 584 .procname = "tcp_tso_win_divisor", 585 .data = &sysctl_tcp_tso_win_divisor, 586 .maxlen = sizeof(int), 587 .mode = 0644, 588 .proc_handler = proc_dointvec, 589 }, 590 { 591 .procname = "tcp_congestion_control", 592 .mode = 0644, 593 .maxlen = TCP_CA_NAME_MAX, 594 .proc_handler = proc_tcp_congestion_control, 595 }, 596 { 597 .procname = "tcp_mtu_probing", 598 .data = &sysctl_tcp_mtu_probing, 599 .maxlen = sizeof(int), 600 .mode = 0644, 601 .proc_handler = proc_dointvec, 602 }, 603 { 604 .procname = "tcp_base_mss", 605 .data = &sysctl_tcp_base_mss, 606 .maxlen = sizeof(int), 607 .mode = 0644, 608 .proc_handler = proc_dointvec, 609 }, 610 { 611 .procname = "tcp_workaround_signed_windows", 612 .data = &sysctl_tcp_workaround_signed_windows, 613 .maxlen = sizeof(int), 614 .mode = 0644, 615 .proc_handler = proc_dointvec 616 }, 617 { 618 .procname = "tcp_limit_output_bytes", 619 .data = &sysctl_tcp_limit_output_bytes, 620 .maxlen = sizeof(int), 621 .mode = 0644, 622 .proc_handler = proc_dointvec 623 }, 624 { 625 .procname = "tcp_challenge_ack_limit", 626 .data = &sysctl_tcp_challenge_ack_limit, 627 .maxlen = sizeof(int), 628 .mode = 0644, 629 .proc_handler = proc_dointvec 630 }, 631 #ifdef CONFIG_NET_DMA 632 { 633 .procname = "tcp_dma_copybreak", 634 .data = &sysctl_tcp_dma_copybreak, 635 .maxlen = sizeof(int), 636 .mode = 0644, 637 .proc_handler = proc_dointvec 638 }, 639 #endif 640 { 641 .procname = "tcp_slow_start_after_idle", 642 .data = &sysctl_tcp_slow_start_after_idle, 643 .maxlen = sizeof(int), 644 .mode = 0644, 645 .proc_handler = proc_dointvec 646 }, 647 #ifdef CONFIG_NETLABEL 648 { 649 .procname = "cipso_cache_enable", 650 .data = &cipso_v4_cache_enabled, 651 .maxlen = sizeof(int), 652 .mode = 0644, 653 .proc_handler = proc_dointvec, 654 }, 655 { 656 .procname = "cipso_cache_bucket_size", 657 .data = &cipso_v4_cache_bucketsize, 658 .maxlen = sizeof(int), 659 .mode = 0644, 660 .proc_handler = proc_dointvec, 661 }, 662 { 663 .procname = "cipso_rbm_optfmt", 664 .data = &cipso_v4_rbm_optfmt, 665 .maxlen = sizeof(int), 666 .mode = 0644, 667 .proc_handler = proc_dointvec, 668 }, 669 { 670 .procname = "cipso_rbm_strictvalid", 671 .data = &cipso_v4_rbm_strictvalid, 672 .maxlen = sizeof(int), 673 .mode = 0644, 674 .proc_handler = proc_dointvec, 675 }, 676 #endif /* CONFIG_NETLABEL */ 677 { 678 .procname = "tcp_available_congestion_control", 679 .maxlen = TCP_CA_BUF_MAX, 680 .mode = 0444, 681 .proc_handler = proc_tcp_available_congestion_control, 682 }, 683 { 684 .procname = "tcp_allowed_congestion_control", 685 .maxlen = TCP_CA_BUF_MAX, 686 .mode = 0644, 687 .proc_handler = proc_allowed_congestion_control, 688 }, 689 { 690 .procname = "tcp_thin_linear_timeouts", 691 .data = &sysctl_tcp_thin_linear_timeouts, 692 .maxlen = sizeof(int), 693 .mode = 0644, 694 .proc_handler = proc_dointvec 695 }, 696 { 697 .procname = "tcp_thin_dupack", 698 .data = &sysctl_tcp_thin_dupack, 699 .maxlen = sizeof(int), 700 .mode = 0644, 701 .proc_handler = proc_dointvec 702 }, 703 { 704 .procname = "tcp_early_retrans", 705 .data = &sysctl_tcp_early_retrans, 706 .maxlen = sizeof(int), 707 .mode = 0644, 708 .proc_handler = proc_dointvec_minmax, 709 .extra1 = &zero, 710 .extra2 = &four, 711 }, 712 { 713 .procname = "tcp_min_tso_segs", 714 .data = &sysctl_tcp_min_tso_segs, 715 .maxlen = sizeof(int), 716 .mode = 0644, 717 .proc_handler = proc_dointvec_minmax, 718 .extra1 = &zero, 719 .extra2 = &gso_max_segs, 720 }, 721 { 722 .procname = "tcp_autocorking", 723 .data = &sysctl_tcp_autocorking, 724 .maxlen = sizeof(int), 725 .mode = 0644, 726 .proc_handler = proc_dointvec_minmax, 727 .extra1 = &zero, 728 .extra2 = &one, 729 }, 730 { 731 .procname = "udp_mem", 732 .data = &sysctl_udp_mem, 733 .maxlen = sizeof(sysctl_udp_mem), 734 .mode = 0644, 735 .proc_handler = proc_doulongvec_minmax, 736 }, 737 { 738 .procname = "udp_rmem_min", 739 .data = &sysctl_udp_rmem_min, 740 .maxlen = sizeof(sysctl_udp_rmem_min), 741 .mode = 0644, 742 .proc_handler = proc_dointvec_minmax, 743 .extra1 = &one 744 }, 745 { 746 .procname = "udp_wmem_min", 747 .data = &sysctl_udp_wmem_min, 748 .maxlen = sizeof(sysctl_udp_wmem_min), 749 .mode = 0644, 750 .proc_handler = proc_dointvec_minmax, 751 .extra1 = &one 752 }, 753 { } 754 }; 755 756 static struct ctl_table ipv4_net_table[] = { 757 { 758 .procname = "icmp_echo_ignore_all", 759 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_all, 760 .maxlen = sizeof(int), 761 .mode = 0644, 762 .proc_handler = proc_dointvec 763 }, 764 { 765 .procname = "icmp_echo_ignore_broadcasts", 766 .data = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts, 767 .maxlen = sizeof(int), 768 .mode = 0644, 769 .proc_handler = proc_dointvec 770 }, 771 { 772 .procname = "icmp_ignore_bogus_error_responses", 773 .data = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses, 774 .maxlen = sizeof(int), 775 .mode = 0644, 776 .proc_handler = proc_dointvec 777 }, 778 { 779 .procname = "icmp_errors_use_inbound_ifaddr", 780 .data = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr, 781 .maxlen = sizeof(int), 782 .mode = 0644, 783 .proc_handler = proc_dointvec 784 }, 785 { 786 .procname = "icmp_ratelimit", 787 .data = &init_net.ipv4.sysctl_icmp_ratelimit, 788 .maxlen = sizeof(int), 789 .mode = 0644, 790 .proc_handler = proc_dointvec_ms_jiffies, 791 }, 792 { 793 .procname = "icmp_ratemask", 794 .data = &init_net.ipv4.sysctl_icmp_ratemask, 795 .maxlen = sizeof(int), 796 .mode = 0644, 797 .proc_handler = proc_dointvec 798 }, 799 { 800 .procname = "ping_group_range", 801 .data = &init_net.ipv4.ping_group_range.range, 802 .maxlen = sizeof(gid_t)*2, 803 .mode = 0644, 804 .proc_handler = ipv4_ping_group_range, 805 }, 806 { 807 .procname = "tcp_ecn", 808 .data = &init_net.ipv4.sysctl_tcp_ecn, 809 .maxlen = sizeof(int), 810 .mode = 0644, 811 .proc_handler = proc_dointvec 812 }, 813 { 814 .procname = "ip_local_port_range", 815 .maxlen = sizeof(init_net.ipv4.ip_local_ports.range), 816 .data = &init_net.ipv4.ip_local_ports.range, 817 .mode = 0644, 818 .proc_handler = ipv4_local_port_range, 819 }, 820 { 821 .procname = "ip_local_reserved_ports", 822 .data = &init_net.ipv4.sysctl_local_reserved_ports, 823 .maxlen = 65536, 824 .mode = 0644, 825 .proc_handler = proc_do_large_bitmap, 826 }, 827 { 828 .procname = "ip_no_pmtu_disc", 829 .data = &init_net.ipv4.sysctl_ip_no_pmtu_disc, 830 .maxlen = sizeof(int), 831 .mode = 0644, 832 .proc_handler = proc_dointvec 833 }, 834 { 835 .procname = "ip_forward_use_pmtu", 836 .data = &init_net.ipv4.sysctl_ip_fwd_use_pmtu, 837 .maxlen = sizeof(int), 838 .mode = 0644, 839 .proc_handler = proc_dointvec, 840 }, 841 { 842 .procname = "fwmark_reflect", 843 .data = &init_net.ipv4.sysctl_fwmark_reflect, 844 .maxlen = sizeof(int), 845 .mode = 0644, 846 .proc_handler = proc_dointvec, 847 }, 848 { 849 .procname = "tcp_fwmark_accept", 850 .data = &init_net.ipv4.sysctl_tcp_fwmark_accept, 851 .maxlen = sizeof(int), 852 .mode = 0644, 853 .proc_handler = proc_dointvec, 854 }, 855 { } 856 }; 857 858 static __net_init int ipv4_sysctl_init_net(struct net *net) 859 { 860 struct ctl_table *table; 861 862 table = ipv4_net_table; 863 if (!net_eq(net, &init_net)) { 864 int i; 865 866 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL); 867 if (table == NULL) 868 goto err_alloc; 869 870 /* Update the variables to point into the current struct net */ 871 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) 872 table[i].data += (void *)net - (void *)&init_net; 873 } 874 875 net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table); 876 if (net->ipv4.ipv4_hdr == NULL) 877 goto err_reg; 878 879 net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL); 880 if (!net->ipv4.sysctl_local_reserved_ports) 881 goto err_ports; 882 883 return 0; 884 885 err_ports: 886 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 887 err_reg: 888 if (!net_eq(net, &init_net)) 889 kfree(table); 890 err_alloc: 891 return -ENOMEM; 892 } 893 894 static __net_exit void ipv4_sysctl_exit_net(struct net *net) 895 { 896 struct ctl_table *table; 897 898 kfree(net->ipv4.sysctl_local_reserved_ports); 899 table = net->ipv4.ipv4_hdr->ctl_table_arg; 900 unregister_net_sysctl_table(net->ipv4.ipv4_hdr); 901 kfree(table); 902 } 903 904 static __net_initdata struct pernet_operations ipv4_sysctl_ops = { 905 .init = ipv4_sysctl_init_net, 906 .exit = ipv4_sysctl_exit_net, 907 }; 908 909 static __init int sysctl_ipv4_init(void) 910 { 911 struct ctl_table_header *hdr; 912 913 hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table); 914 if (hdr == NULL) 915 return -ENOMEM; 916 917 if (register_pernet_subsys(&ipv4_sysctl_ops)) { 918 unregister_net_sysctl_table(hdr); 919 return -ENOMEM; 920 } 921 922 return 0; 923 } 924 925 __initcall(sysctl_ipv4_init); 926