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   1 /*
   2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   3  *
   4  * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
   5  *
   6  * Begun April 1, 1996, Mike Shaver.
   7  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/module.h>
  12 #include <linux/sysctl.h>
  13 #include <linux/igmp.h>
  14 #include <linux/inetdevice.h>
  15 #include <net/snmp.h>
  16 #include <net/icmp.h>
  17 #include <net/ip.h>
  18 #include <net/route.h>
  19 #include <net/tcp.h>
  20
  21 /* From af_inet.c */
  22 extern int sysctl_ip_nonlocal_bind;
  23
  24 #ifdef CONFIG_SYSCTL
  25 static int zero;
  26 static int tcp_retr1_max = 255;
  27 static int ip_local_port_range_min[] = { 1, 1 };
  28 static int ip_local_port_range_max[] = { 65535, 65535 };
  29 #endif
  30
  31 struct ipv4_config ipv4_config;
  32
  33 #ifdef CONFIG_SYSCTL
  34
  35 static
  36 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
  37                         void __user *buffer, size_t *lenp, loff_t *ppos)
  38 {
  39         int val = ipv4_devconf.forwarding;
  40         int ret;
  41
  42         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
  43
  44         if (write && ipv4_devconf.forwarding != val)
  45                 inet_forward_change();
  46
  47         return ret;
  48 }
  49
  50 static int ipv4_sysctl_forward_strategy(ctl_table *table,
  51                          int __user *name, int nlen,
  52                          void __user *oldval, size_t __user *oldlenp,
  53                          void __user *newval, size_t newlen,
  54                          void **context)
  55 {
  56         int *valp = table->data;
  57         int new;
  58
  59         if (!newval || !newlen)
  60                 return 0;
  61
  62         if (newlen != sizeof(int))
  63                 return -EINVAL;
  64
  65         if (get_user(new, (int __user *)newval))
  66                 return -EFAULT;
  67
  68         if (new == *valp)
  69                 return 0;
  70
  71         if (oldval && oldlenp) {
  72                 size_t len;
  73
  74                 if (get_user(len, oldlenp))
  75                         return -EFAULT;
  76
  77                 if (len) {
  78                         if (len > table->maxlen)
  79                                 len = table->maxlen;
  80                         if (copy_to_user(oldval, valp, len))
  81                                 return -EFAULT;
  82                         if (put_user(len, oldlenp))
  83                                 return -EFAULT;
  84                 }
  85         }
  86
  87         *valp = new;
  88         inet_forward_change();
  89         return 1;
  90 }
  91
  92 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
  93                                        void __user *buffer, size_t *lenp, loff_t *ppos)
  94 {
  95         char val[TCP_CA_NAME_MAX];
  96         ctl_table tbl = {
  97                 .data = val,
  98                 .maxlen = TCP_CA_NAME_MAX,
  99         };
 100         int ret;
 101
 102         tcp_get_default_congestion_control(val);
 103
 104         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 105         if (write && ret == 0)
 106                 ret = tcp_set_default_congestion_control(val);
 107         return ret;
 108 }
 109
 110 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
 111                                          int nlen, void __user *oldval,
 112                                          size_t __user *oldlenp,
 113                                          void __user *newval, size_t newlen,
 114                                          void **context)
 115 {
 116         char val[TCP_CA_NAME_MAX];
 117         ctl_table tbl = {
 118                 .data = val,
 119                 .maxlen = TCP_CA_NAME_MAX,
 120         };
 121         int ret;
 122
 123         tcp_get_default_congestion_control(val);
 124         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
 125                             context);
 126         if (ret == 0 && newval && newlen)
 127                 ret = tcp_set_default_congestion_control(val);
 128         return ret;
 129 }
 130
 131
 132 ctl_table ipv4_table[] = {
 133         {
 134                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 135                 .procname       = "tcp_timestamps",
 136                 .data           = &sysctl_tcp_timestamps,
 137                 .maxlen         = sizeof(int),
 138                 .mode           = 0644,
 139                 .proc_handler   = &proc_dointvec
 140         },
 141         {
 142                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 143                 .procname       = "tcp_window_scaling",
 144                 .data           = &sysctl_tcp_window_scaling,
 145                 .maxlen         = sizeof(int),
 146                 .mode           = 0644,
 147                 .proc_handler   = &proc_dointvec
 148         },
 149         {
 150                 .ctl_name       = NET_IPV4_TCP_SACK,
 151                 .procname       = "tcp_sack",
 152                 .data           = &sysctl_tcp_sack,
 153                 .maxlen         = sizeof(int),
 154                 .mode           = 0644,
 155                 .proc_handler   = &proc_dointvec
 156         },
 157         {
 158                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 159                 .procname       = "tcp_retrans_collapse",
 160                 .data           = &sysctl_tcp_retrans_collapse,
 161                 .maxlen         = sizeof(int),
 162                 .mode           = 0644,
 163                 .proc_handler   = &proc_dointvec
 164         },
 165         {
 166                 .ctl_name       = NET_IPV4_FORWARD,
 167                 .procname       = "ip_forward",
 168                 .data           = &ipv4_devconf.forwarding,
 169                 .maxlen         = sizeof(int),
 170                 .mode           = 0644,
 171                 .proc_handler   = &ipv4_sysctl_forward,
 172                 .strategy       = &ipv4_sysctl_forward_strategy
 173         },
 174         {
 175                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 176                 .procname       = "ip_default_ttl",
 177                 .data           = &sysctl_ip_default_ttl,
 178                 .maxlen         = sizeof(int),
 179                 .mode           = 0644,
 180                 .proc_handler   = &ipv4_doint_and_flush,
 181                 .strategy       = &ipv4_doint_and_flush_strategy,
 182         },
 183         {
 184                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 185                 .procname       = "ip_no_pmtu_disc",
 186                 .data           = &ipv4_config.no_pmtu_disc,
 187                 .maxlen         = sizeof(int),
 188                 .mode           = 0644,
 189                 .proc_handler   = &proc_dointvec
 190         },
 191         {
 192                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 193                 .procname       = "ip_nonlocal_bind",
 194                 .data           = &sysctl_ip_nonlocal_bind,
 195                 .maxlen         = sizeof(int),
 196                 .mode           = 0644,
 197                 .proc_handler   = &proc_dointvec
 198         },
 199         {
 200                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 201                 .procname       = "tcp_syn_retries",
 202                 .data           = &sysctl_tcp_syn_retries,
 203                 .maxlen         = sizeof(int),
 204                 .mode           = 0644,
 205                 .proc_handler   = &proc_dointvec
 206         },
 207         {
 208                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 209                 .procname       = "tcp_synack_retries",
 210                 .data           = &sysctl_tcp_synack_retries,
 211                 .maxlen         = sizeof(int),
 212                 .mode           = 0644,
 213                 .proc_handler   = &proc_dointvec
 214         },
 215         {
 216                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 217                 .procname       = "tcp_max_orphans",
 218                 .data           = &sysctl_tcp_max_orphans,
 219                 .maxlen         = sizeof(int),
 220                 .mode           = 0644,
 221                 .proc_handler   = &proc_dointvec
 222         },
 223         {
 224                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 225                 .procname       = "tcp_max_tw_buckets",
 226                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 227                 .maxlen         = sizeof(int),
 228                 .mode           = 0644,
 229                 .proc_handler   = &proc_dointvec
 230         },
 231         {
 232                 .ctl_name       = NET_IPV4_IPFRAG_HIGH_THRESH,
 233                 .procname       = "ipfrag_high_thresh",
 234                 .data           = &sysctl_ipfrag_high_thresh,
 235                 .maxlen         = sizeof(int),
 236                 .mode           = 0644,
 237                 .proc_handler   = &proc_dointvec
 238         },
 239         {
 240                 .ctl_name       = NET_IPV4_IPFRAG_LOW_THRESH,
 241                 .procname       = "ipfrag_low_thresh",
 242                 .data           = &sysctl_ipfrag_low_thresh,
 243                 .maxlen         = sizeof(int),
 244                 .mode           = 0644,
 245                 .proc_handler   = &proc_dointvec
 246         },
 247         {
 248                 .ctl_name       = NET_IPV4_DYNADDR,
 249                 .procname       = "ip_dynaddr",
 250                 .data           = &sysctl_ip_dynaddr,
 251                 .maxlen         = sizeof(int),
 252                 .mode           = 0644,
 253                 .proc_handler   = &proc_dointvec
 254         },
 255         {
 256                 .ctl_name       = NET_IPV4_IPFRAG_TIME,
 257                 .procname       = "ipfrag_time",
 258                 .data           = &sysctl_ipfrag_time,
 259                 .maxlen         = sizeof(int),
 260                 .mode           = 0644,
 261                 .proc_handler   = &proc_dointvec_jiffies,
 262                 .strategy       = &sysctl_jiffies
 263         },
 264         {
 265                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 266                 .procname       = "tcp_keepalive_time",
 267                 .data           = &sysctl_tcp_keepalive_time,
 268                 .maxlen         = sizeof(int),
 269                 .mode           = 0644,
 270                 .proc_handler   = &proc_dointvec_jiffies,
 271                 .strategy       = &sysctl_jiffies
 272         },
 273         {
 274                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 275                 .procname       = "tcp_keepalive_probes",
 276                 .data           = &sysctl_tcp_keepalive_probes,
 277                 .maxlen         = sizeof(int),
 278                 .mode           = 0644,
 279                 .proc_handler   = &proc_dointvec
 280         },
 281         {
 282                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 283                 .procname       = "tcp_keepalive_intvl",
 284                 .data           = &sysctl_tcp_keepalive_intvl,
 285                 .maxlen         = sizeof(int),
 286                 .mode           = 0644,
 287                 .proc_handler   = &proc_dointvec_jiffies,
 288                 .strategy       = &sysctl_jiffies
 289         },
 290         {
 291                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 292                 .procname       = "tcp_retries1",
 293                 .data           = &sysctl_tcp_retries1,
 294                 .maxlen         = sizeof(int),
 295                 .mode           = 0644,
 296                 .proc_handler   = &proc_dointvec_minmax,
 297                 .strategy       = &sysctl_intvec,
 298                 .extra2         = &tcp_retr1_max
 299         },
 300         {
 301                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 302                 .procname       = "tcp_retries2",
 303                 .data           = &sysctl_tcp_retries2,
 304                 .maxlen         = sizeof(int),
 305                 .mode           = 0644,
 306                 .proc_handler   = &proc_dointvec
 307         },
 308         {
 309                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 310                 .procname       = "tcp_fin_timeout",
 311                 .data           = &sysctl_tcp_fin_timeout,
 312                 .maxlen         = sizeof(int),
 313                 .mode           = 0644,
 314                 .proc_handler   = &proc_dointvec_jiffies,
 315                 .strategy       = &sysctl_jiffies
 316         },
 317 #ifdef CONFIG_SYN_COOKIES
 318         {
 319                 .ctl_name       = NET_TCP_SYNCOOKIES,
 320                 .procname       = "tcp_syncookies",
 321                 .data           = &sysctl_tcp_syncookies,
 322                 .maxlen         = sizeof(int),
 323                 .mode           = 0644,
 324                 .proc_handler   = &proc_dointvec
 325         },
 326 #endif
 327         {
 328                 .ctl_name       = NET_TCP_TW_RECYCLE,
 329                 .procname       = "tcp_tw_recycle",
 330                 .data           = &tcp_death_row.sysctl_tw_recycle,
 331                 .maxlen         = sizeof(int),
 332                 .mode           = 0644,
 333                 .proc_handler   = &proc_dointvec
 334         },
 335         {
 336                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 337                 .procname       = "tcp_abort_on_overflow",
 338                 .data           = &sysctl_tcp_abort_on_overflow,
 339                 .maxlen         = sizeof(int),
 340                 .mode           = 0644,
 341                 .proc_handler   = &proc_dointvec
 342         },
 343         {
 344                 .ctl_name       = NET_TCP_STDURG,
 345                 .procname       = "tcp_stdurg",
 346                 .data           = &sysctl_tcp_stdurg,
 347                 .maxlen         = sizeof(int),
 348                 .mode           = 0644,
 349                 .proc_handler   = &proc_dointvec
 350         },
 351         {
 352                 .ctl_name       = NET_TCP_RFC1337,
 353                 .procname       = "tcp_rfc1337",
 354                 .data           = &sysctl_tcp_rfc1337,
 355                 .maxlen         = sizeof(int),
 356                 .mode           = 0644,
 357                 .proc_handler   = &proc_dointvec
 358         },
 359         {
 360                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 361                 .procname       = "tcp_max_syn_backlog",
 362                 .data           = &sysctl_max_syn_backlog,
 363                 .maxlen         = sizeof(int),
 364                 .mode           = 0644,
 365                 .proc_handler   = &proc_dointvec
 366         },
 367         {
 368                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 369                 .procname       = "ip_local_port_range",
 370                 .data           = &sysctl_local_port_range,
 371                 .maxlen         = sizeof(sysctl_local_port_range),
 372                 .mode           = 0644,
 373                 .proc_handler   = &proc_dointvec_minmax,
 374                 .strategy       = &sysctl_intvec,
 375                 .extra1         = ip_local_port_range_min,
 376                 .extra2         = ip_local_port_range_max
 377         },
 378         {
 379                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 380                 .procname       = "icmp_echo_ignore_all",
 381                 .data           = &sysctl_icmp_echo_ignore_all,
 382                 .maxlen         = sizeof(int),
 383                 .mode           = 0644,
 384                 .proc_handler   = &proc_dointvec
 385         },
 386         {
 387                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 388                 .procname       = "icmp_echo_ignore_broadcasts",
 389                 .data           = &sysctl_icmp_echo_ignore_broadcasts,
 390                 .maxlen         = sizeof(int),
 391                 .mode           = 0644,
 392                 .proc_handler   = &proc_dointvec
 393         },
 394         {
 395                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 396                 .procname       = "icmp_ignore_bogus_error_responses",
 397                 .data           = &sysctl_icmp_ignore_bogus_error_responses,
 398                 .maxlen         = sizeof(int),
 399                 .mode           = 0644,
 400                 .proc_handler   = &proc_dointvec
 401         },
 402         {
 403                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 404                 .procname       = "icmp_errors_use_inbound_ifaddr",
 405                 .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
 406                 .maxlen         = sizeof(int),
 407                 .mode           = 0644,
 408                 .proc_handler   = &proc_dointvec
 409         },
 410         {
 411                 .ctl_name       = NET_IPV4_ROUTE,
 412                 .procname       = "route",
 413                 .maxlen         = 0,
 414                 .mode           = 0555,
 415                 .child          = ipv4_route_table
 416         },
 417 #ifdef CONFIG_IP_MULTICAST
 418         {
 419                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 420                 .procname       = "igmp_max_memberships",
 421                 .data           = &sysctl_igmp_max_memberships,
 422                 .maxlen         = sizeof(int),
 423                 .mode           = 0644,
 424                 .proc_handler   = &proc_dointvec
 425         },
 426
 427 #endif
 428         {
 429                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 430                 .procname       = "igmp_max_msf",
 431                 .data           = &sysctl_igmp_max_msf,
 432                 .maxlen         = sizeof(int),
 433                 .mode           = 0644,
 434                 .proc_handler   = &proc_dointvec
 435         },
 436         {
 437                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 438                 .procname       = "inet_peer_threshold",
 439                 .data           = &inet_peer_threshold,
 440                 .maxlen         = sizeof(int),
 441                 .mode           = 0644,
 442                 .proc_handler   = &proc_dointvec
 443         },
 444         {
 445                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 446                 .procname       = "inet_peer_minttl",
 447                 .data           = &inet_peer_minttl,
 448                 .maxlen         = sizeof(int),
 449                 .mode           = 0644,
 450                 .proc_handler   = &proc_dointvec_jiffies,
 451                 .strategy       = &sysctl_jiffies
 452         },
 453         {
 454                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 455                 .procname       = "inet_peer_maxttl",
 456                 .data           = &inet_peer_maxttl,
 457                 .maxlen         = sizeof(int),
 458                 .mode           = 0644,
 459                 .proc_handler   = &proc_dointvec_jiffies,
 460                 .strategy       = &sysctl_jiffies
 461         },
 462         {
 463                 .ctl_name       = NET_IPV4_INET_PEER_GC_MINTIME,
 464                 .procname       = "inet_peer_gc_mintime",
 465                 .data           = &inet_peer_gc_mintime,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = &proc_dointvec_jiffies,
 469                 .strategy       = &sysctl_jiffies
 470         },
 471         {
 472                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 473                 .procname       = "inet_peer_gc_maxtime",
 474                 .data           = &inet_peer_gc_maxtime,
 475                 .maxlen         = sizeof(int),
 476                 .mode           = 0644,
 477                 .proc_handler   = &proc_dointvec_jiffies,
 478                 .strategy       = &sysctl_jiffies
 479         },
 480         {
 481                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 482                 .procname       = "tcp_orphan_retries",
 483                 .data           = &sysctl_tcp_orphan_retries,
 484                 .maxlen         = sizeof(int),
 485                 .mode           = 0644,
 486                 .proc_handler   = &proc_dointvec
 487         },
 488         {
 489                 .ctl_name       = NET_TCP_FACK,
 490                 .procname       = "tcp_fack",
 491                 .data           = &sysctl_tcp_fack,
 492                 .maxlen         = sizeof(int),
 493                 .mode           = 0644,
 494                 .proc_handler   = &proc_dointvec
 495         },
 496         {
 497                 .ctl_name       = NET_TCP_REORDERING,
 498                 .procname       = "tcp_reordering",
 499                 .data           = &sysctl_tcp_reordering,
 500                 .maxlen         = sizeof(int),
 501                 .mode           = 0644,
 502                 .proc_handler   = &proc_dointvec
 503         },
 504         {
 505                 .ctl_name       = NET_TCP_ECN,
 506                 .procname       = "tcp_ecn",
 507                 .data           = &sysctl_tcp_ecn,
 508                 .maxlen         = sizeof(int),
 509                 .mode           = 0644,
 510                 .proc_handler   = &proc_dointvec
 511         },
 512         {
 513                 .ctl_name       = NET_TCP_DSACK,
 514                 .procname       = "tcp_dsack",
 515                 .data           = &sysctl_tcp_dsack,
 516                 .maxlen         = sizeof(int),
 517                 .mode           = 0644,
 518                 .proc_handler   = &proc_dointvec
 519         },
 520         {
 521                 .ctl_name       = NET_TCP_MEM,
 522                 .procname       = "tcp_mem",
 523                 .data           = &sysctl_tcp_mem,
 524                 .maxlen         = sizeof(sysctl_tcp_mem),
 525                 .mode           = 0644,
 526                 .proc_handler   = &proc_dointvec
 527         },
 528         {
 529                 .ctl_name       = NET_TCP_WMEM,
 530                 .procname       = "tcp_wmem",
 531                 .data           = &sysctl_tcp_wmem,
 532                 .maxlen         = sizeof(sysctl_tcp_wmem),
 533                 .mode           = 0644,
 534                 .proc_handler   = &proc_dointvec
 535         },
 536         {
 537                 .ctl_name       = NET_TCP_RMEM,
 538                 .procname       = "tcp_rmem",
 539                 .data           = &sysctl_tcp_rmem,
 540                 .maxlen         = sizeof(sysctl_tcp_rmem),
 541                 .mode           = 0644,
 542                 .proc_handler   = &proc_dointvec
 543         },
 544         {
 545                 .ctl_name       = NET_TCP_APP_WIN,
 546                 .procname       = "tcp_app_win",
 547                 .data           = &sysctl_tcp_app_win,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = &proc_dointvec
 551         },
 552         {
 553                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 554                 .procname       = "tcp_adv_win_scale",
 555                 .data           = &sysctl_tcp_adv_win_scale,
 556                 .maxlen         = sizeof(int),
 557                 .mode           = 0644,
 558                 .proc_handler   = &proc_dointvec
 559         },
 560         {
 561                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 562                 .procname       = "icmp_ratelimit",
 563                 .data           = &sysctl_icmp_ratelimit,
 564                 .maxlen         = sizeof(int),
 565                 .mode           = 0644,
 566                 .proc_handler   = &proc_dointvec
 567         },
 568         {
 569                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 570                 .procname       = "icmp_ratemask",
 571                 .data           = &sysctl_icmp_ratemask,
 572                 .maxlen         = sizeof(int),
 573                 .mode           = 0644,
 574                 .proc_handler   = &proc_dointvec
 575         },
 576         {
 577                 .ctl_name       = NET_TCP_TW_REUSE,
 578                 .procname       = "tcp_tw_reuse",
 579                 .data           = &sysctl_tcp_tw_reuse,
 580                 .maxlen         = sizeof(int),
 581                 .mode           = 0644,
 582                 .proc_handler   = &proc_dointvec
 583         },
 584         {
 585                 .ctl_name       = NET_TCP_FRTO,
 586                 .procname       = "tcp_frto",
 587                 .data           = &sysctl_tcp_frto,
 588                 .maxlen         = sizeof(int),
 589                 .mode           = 0644,
 590                 .proc_handler   = &proc_dointvec
 591         },
 592         {
 593                 .ctl_name       = NET_TCP_LOW_LATENCY,
 594                 .procname       = "tcp_low_latency",
 595                 .data           = &sysctl_tcp_low_latency,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = &proc_dointvec
 599         },
 600         {
 601                 .ctl_name       = NET_IPV4_IPFRAG_SECRET_INTERVAL,
 602                 .procname       = "ipfrag_secret_interval",
 603                 .data           = &sysctl_ipfrag_secret_interval,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = &proc_dointvec_jiffies,
 607                 .strategy       = &sysctl_jiffies
 608         },
 609         {
 610                 .ctl_name       = NET_IPV4_IPFRAG_MAX_DIST,
 611                 .procname       = "ipfrag_max_dist",
 612                 .data           = &sysctl_ipfrag_max_dist,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec_minmax,
 616                 .extra1         = &zero
 617         },
 618         {
 619                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 620                 .procname       = "tcp_no_metrics_save",
 621                 .data           = &sysctl_tcp_nometrics_save,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = &proc_dointvec,
 625         },
 626         {
 627                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 628                 .procname       = "tcp_moderate_rcvbuf",
 629                 .data           = &sysctl_tcp_moderate_rcvbuf,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 .proc_handler   = &proc_dointvec,
 633         },
 634         {
 635                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 636                 .procname       = "tcp_tso_win_divisor",
 637                 .data           = &sysctl_tcp_tso_win_divisor,
 638                 .maxlen         = sizeof(int),
 639                 .mode           = 0644,
 640                 .proc_handler   = &proc_dointvec,
 641         },
 642         {
 643                 .ctl_name       = NET_TCP_CONG_CONTROL,
 644                 .procname       = "tcp_congestion_control",
 645                 .mode           = 0644,
 646                 .maxlen         = TCP_CA_NAME_MAX,
 647                 .proc_handler   = &proc_tcp_congestion_control,
 648                 .strategy       = &sysctl_tcp_congestion_control,
 649         },
 650         {
 651                 .ctl_name       = NET_TCP_ABC,
 652                 .procname       = "tcp_abc",
 653                 .data           = &sysctl_tcp_abc,
 654                 .maxlen         = sizeof(int),
 655                 .mode           = 0644,
 656                 .proc_handler   = &proc_dointvec,
 657         },
 658         {
 659                 .ctl_name       = NET_TCP_MTU_PROBING,
 660                 .procname       = "tcp_mtu_probing",
 661                 .data           = &sysctl_tcp_mtu_probing,
 662                 .maxlen         = sizeof(int),
 663                 .mode           = 0644,
 664                 .proc_handler   = &proc_dointvec,
 665         },
 666         {
 667                 .ctl_name       = NET_TCP_BASE_MSS,
 668                 .procname       = "tcp_base_mss",
 669                 .data           = &sysctl_tcp_base_mss,
 670                 .maxlen         = sizeof(int),
 671                 .mode           = 0644,
 672                 .proc_handler   = &proc_dointvec,
 673         },
 674         {
 675                 .ctl_name       = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
 676                 .procname       = "tcp_workaround_signed_windows",
 677                 .data           = &sysctl_tcp_workaround_signed_windows,
 678                 .maxlen         = sizeof(int),
 679                 .mode           = 0644,
 680                 .proc_handler   = &proc_dointvec
 681         },
 682 #ifdef CONFIG_NET_DMA
 683         {
 684                 .ctl_name       = NET_TCP_DMA_COPYBREAK,
 685                 .procname       = "tcp_dma_copybreak",
 686                 .data           = &sysctl_tcp_dma_copybreak,
 687                 .maxlen         = sizeof(int),
 688                 .mode           = 0644,
 689                 .proc_handler   = &proc_dointvec
 690         },
 691 #endif
 692         {
 693                 .ctl_name       = NET_TCP_SLOW_START_AFTER_IDLE,
 694                 .procname       = "tcp_slow_start_after_idle",
 695                 .data           = &sysctl_tcp_slow_start_after_idle,
 696                 .maxlen         = sizeof(int),
 697                 .mode           = 0644,
 698                 .proc_handler   = &proc_dointvec
 699         },
 700         { .ctl_name = 0 }
 701 };
 702
 703 #endif /* CONFIG_SYSCTL */
 704
 705 EXPORT_SYMBOL(ipv4_config);