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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/config.h>
  14 #include <linux/igmp.h>
  15 #include <linux/inetdevice.h>
  16 #include <net/snmp.h>
  17 #include <net/icmp.h>
  18 #include <net/ip.h>
  19 #include <net/route.h>
  20 #include <net/tcp.h>
  21
  22 /* From af_inet.c */
  23 extern int sysctl_ip_nonlocal_bind;
  24
  25 #ifdef CONFIG_SYSCTL
  26 static int zero;
  27 static int tcp_retr1_max = 255;
  28 static int ip_local_port_range_min[] = { 1, 1 };
  29 static int ip_local_port_range_max[] = { 65535, 65535 };
  30 #endif
  31
  32 struct ipv4_config ipv4_config;
  33
  34 #ifdef CONFIG_SYSCTL
  35
  36 static
  37 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
  38                         void __user *buffer, size_t *lenp, loff_t *ppos)
  39 {
  40         int val = ipv4_devconf.forwarding;
  41         int ret;
  42
  43         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
  44
  45         if (write && ipv4_devconf.forwarding != val)
  46                 inet_forward_change();
  47
  48         return ret;
  49 }
  50
  51 static int ipv4_sysctl_forward_strategy(ctl_table *table,
  52                          int __user *name, int nlen,
  53                          void __user *oldval, size_t __user *oldlenp,
  54                          void __user *newval, size_t newlen,
  55                          void **context)
  56 {
  57         int *valp = table->data;
  58         int new;
  59
  60         if (!newval || !newlen)
  61                 return 0;
  62
  63         if (newlen != sizeof(int))
  64                 return -EINVAL;
  65
  66         if (get_user(new, (int __user *)newval))
  67                 return -EFAULT;
  68
  69         if (new == *valp)
  70                 return 0;
  71
  72         if (oldval && oldlenp) {
  73                 size_t len;
  74
  75                 if (get_user(len, oldlenp))
  76                         return -EFAULT;
  77
  78                 if (len) {
  79                         if (len > table->maxlen)
  80                                 len = table->maxlen;
  81                         if (copy_to_user(oldval, valp, len))
  82                                 return -EFAULT;
  83                         if (put_user(len, oldlenp))
  84                                 return -EFAULT;
  85                 }
  86         }
  87
  88         *valp = new;
  89         inet_forward_change();
  90         return 1;
  91 }
  92
  93 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
  94                                        void __user *buffer, size_t *lenp, loff_t *ppos)
  95 {
  96         char val[TCP_CA_NAME_MAX];
  97         ctl_table tbl = {
  98                 .data = val,
  99                 .maxlen = TCP_CA_NAME_MAX,
 100         };
 101         int ret;
 102
 103         tcp_get_default_congestion_control(val);
 104
 105         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 106         if (write && ret == 0)
 107                 ret = tcp_set_default_congestion_control(val);
 108         return ret;
 109 }
 110
 111 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
 112                                          int nlen, void __user *oldval,
 113                                          size_t __user *oldlenp,
 114                                          void __user *newval, size_t newlen,
 115                                          void **context)
 116 {
 117         char val[TCP_CA_NAME_MAX];
 118         ctl_table tbl = {
 119                 .data = val,
 120                 .maxlen = TCP_CA_NAME_MAX,
 121         };
 122         int ret;
 123
 124         tcp_get_default_congestion_control(val);
 125         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
 126                             context);
 127         if (ret == 0 && newval && newlen)
 128                 ret = tcp_set_default_congestion_control(val);
 129         return ret;
 130 }
 131
 132
 133 ctl_table ipv4_table[] = {
 134         {
 135                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 136                 .procname       = "tcp_timestamps",
 137                 .data           = &sysctl_tcp_timestamps,
 138                 .maxlen         = sizeof(int),
 139                 .mode           = 0644,
 140                 .proc_handler   = &proc_dointvec
 141         },
 142         {
 143                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 144                 .procname       = "tcp_window_scaling",
 145                 .data           = &sysctl_tcp_window_scaling,
 146                 .maxlen         = sizeof(int),
 147                 .mode           = 0644,
 148                 .proc_handler   = &proc_dointvec
 149         },
 150         {
 151                 .ctl_name       = NET_IPV4_TCP_SACK,
 152                 .procname       = "tcp_sack",
 153                 .data           = &sysctl_tcp_sack,
 154                 .maxlen         = sizeof(int),
 155                 .mode           = 0644,
 156                 .proc_handler   = &proc_dointvec
 157         },
 158         {
 159                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 160                 .procname       = "tcp_retrans_collapse",
 161                 .data           = &sysctl_tcp_retrans_collapse,
 162                 .maxlen         = sizeof(int),
 163                 .mode           = 0644,
 164                 .proc_handler   = &proc_dointvec
 165         },
 166         {
 167                 .ctl_name       = NET_IPV4_FORWARD,
 168                 .procname       = "ip_forward",
 169                 .data           = &ipv4_devconf.forwarding,
 170                 .maxlen         = sizeof(int),
 171                 .mode           = 0644,
 172                 .proc_handler   = &ipv4_sysctl_forward,
 173                 .strategy       = &ipv4_sysctl_forward_strategy
 174         },
 175         {
 176                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 177                 .procname       = "ip_default_ttl",
 178                 .data           = &sysctl_ip_default_ttl,
 179                 .maxlen         = sizeof(int),
 180                 .mode           = 0644,
 181                 .proc_handler   = &ipv4_doint_and_flush,
 182                 .strategy       = &ipv4_doint_and_flush_strategy,
 183         },
 184         {
 185                 .ctl_name       = NET_IPV4_AUTOCONFIG,
 186                 .procname       = "ip_autoconfig",
 187                 .data           = &ipv4_config.autoconfig,
 188                 .maxlen         = sizeof(int),
 189                 .mode           = 0644,
 190                 .proc_handler   = &proc_dointvec
 191         },
 192         {
 193                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 194                 .procname       = "ip_no_pmtu_disc",
 195                 .data           = &ipv4_config.no_pmtu_disc,
 196                 .maxlen         = sizeof(int),
 197                 .mode           = 0644,
 198                 .proc_handler   = &proc_dointvec
 199         },
 200         {
 201                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 202                 .procname       = "ip_nonlocal_bind",
 203                 .data           = &sysctl_ip_nonlocal_bind,
 204                 .maxlen         = sizeof(int),
 205                 .mode           = 0644,
 206                 .proc_handler   = &proc_dointvec
 207         },
 208         {
 209                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 210                 .procname       = "tcp_syn_retries",
 211                 .data           = &sysctl_tcp_syn_retries,
 212                 .maxlen         = sizeof(int),
 213                 .mode           = 0644,
 214                 .proc_handler   = &proc_dointvec
 215         },
 216         {
 217                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 218                 .procname       = "tcp_synack_retries",
 219                 .data           = &sysctl_tcp_synack_retries,
 220                 .maxlen         = sizeof(int),
 221                 .mode           = 0644,
 222                 .proc_handler   = &proc_dointvec
 223         },
 224         {
 225                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 226                 .procname       = "tcp_max_orphans",
 227                 .data           = &sysctl_tcp_max_orphans,
 228                 .maxlen         = sizeof(int),
 229                 .mode           = 0644,
 230                 .proc_handler   = &proc_dointvec
 231         },
 232         {
 233                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 234                 .procname       = "tcp_max_tw_buckets",
 235                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 236                 .maxlen         = sizeof(int),
 237                 .mode           = 0644,
 238                 .proc_handler   = &proc_dointvec
 239         },
 240         {
 241                 .ctl_name       = NET_IPV4_IPFRAG_HIGH_THRESH,
 242                 .procname       = "ipfrag_high_thresh",
 243                 .data           = &sysctl_ipfrag_high_thresh,
 244                 .maxlen         = sizeof(int),
 245                 .mode           = 0644,
 246                 .proc_handler   = &proc_dointvec
 247         },
 248         {
 249                 .ctl_name       = NET_IPV4_IPFRAG_LOW_THRESH,
 250                 .procname       = "ipfrag_low_thresh",
 251                 .data           = &sysctl_ipfrag_low_thresh,
 252                 .maxlen         = sizeof(int),
 253                 .mode           = 0644,
 254                 .proc_handler   = &proc_dointvec
 255         },
 256         {
 257                 .ctl_name       = NET_IPV4_DYNADDR,
 258                 .procname       = "ip_dynaddr",
 259                 .data           = &sysctl_ip_dynaddr,
 260                 .maxlen         = sizeof(int),
 261                 .mode           = 0644,
 262                 .proc_handler   = &proc_dointvec
 263         },
 264         {
 265                 .ctl_name       = NET_IPV4_IPFRAG_TIME,
 266                 .procname       = "ipfrag_time",
 267                 .data           = &sysctl_ipfrag_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_TIME,
 275                 .procname       = "tcp_keepalive_time",
 276                 .data           = &sysctl_tcp_keepalive_time,
 277                 .maxlen         = sizeof(int),
 278                 .mode           = 0644,
 279                 .proc_handler   = &proc_dointvec_jiffies,
 280                 .strategy       = &sysctl_jiffies
 281         },
 282         {
 283                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 284                 .procname       = "tcp_keepalive_probes",
 285                 .data           = &sysctl_tcp_keepalive_probes,
 286                 .maxlen         = sizeof(int),
 287                 .mode           = 0644,
 288                 .proc_handler   = &proc_dointvec
 289         },
 290         {
 291                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 292                 .procname       = "tcp_keepalive_intvl",
 293                 .data           = &sysctl_tcp_keepalive_intvl,
 294                 .maxlen         = sizeof(int),
 295                 .mode           = 0644,
 296                 .proc_handler   = &proc_dointvec_jiffies,
 297                 .strategy       = &sysctl_jiffies
 298         },
 299         {
 300                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 301                 .procname       = "tcp_retries1",
 302                 .data           = &sysctl_tcp_retries1,
 303                 .maxlen         = sizeof(int),
 304                 .mode           = 0644,
 305                 .proc_handler   = &proc_dointvec_minmax,
 306                 .strategy       = &sysctl_intvec,
 307                 .extra2         = &tcp_retr1_max
 308         },
 309         {
 310                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 311                 .procname       = "tcp_retries2",
 312                 .data           = &sysctl_tcp_retries2,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = &proc_dointvec
 316         },
 317         {
 318                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 319                 .procname       = "tcp_fin_timeout",
 320                 .data           = &sysctl_tcp_fin_timeout,
 321                 .maxlen         = sizeof(int),
 322                 .mode           = 0644,
 323                 .proc_handler   = &proc_dointvec_jiffies,
 324                 .strategy       = &sysctl_jiffies
 325         },
 326 #ifdef CONFIG_SYN_COOKIES
 327         {
 328                 .ctl_name       = NET_TCP_SYNCOOKIES,
 329                 .procname       = "tcp_syncookies",
 330                 .data           = &sysctl_tcp_syncookies,
 331                 .maxlen         = sizeof(int),
 332                 .mode           = 0644,
 333                 .proc_handler   = &proc_dointvec
 334         },
 335 #endif
 336         {
 337                 .ctl_name       = NET_TCP_TW_RECYCLE,
 338                 .procname       = "tcp_tw_recycle",
 339                 .data           = &tcp_death_row.sysctl_tw_recycle,
 340                 .maxlen         = sizeof(int),
 341                 .mode           = 0644,
 342                 .proc_handler   = &proc_dointvec
 343         },
 344         {
 345                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 346                 .procname       = "tcp_abort_on_overflow",
 347                 .data           = &sysctl_tcp_abort_on_overflow,
 348                 .maxlen         = sizeof(int),
 349                 .mode           = 0644,
 350                 .proc_handler   = &proc_dointvec
 351         },
 352         {
 353                 .ctl_name       = NET_TCP_STDURG,
 354                 .procname       = "tcp_stdurg",
 355                 .data           = &sysctl_tcp_stdurg,
 356                 .maxlen         = sizeof(int),
 357                 .mode           = 0644,
 358                 .proc_handler   = &proc_dointvec
 359         },
 360         {
 361                 .ctl_name       = NET_TCP_RFC1337,
 362                 .procname       = "tcp_rfc1337",
 363                 .data           = &sysctl_tcp_rfc1337,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = &proc_dointvec
 367         },
 368         {
 369                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 370                 .procname       = "tcp_max_syn_backlog",
 371                 .data           = &sysctl_max_syn_backlog,
 372                 .maxlen         = sizeof(int),
 373                 .mode           = 0644,
 374                 .proc_handler   = &proc_dointvec
 375         },
 376         {
 377                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 378                 .procname       = "ip_local_port_range",
 379                 .data           = &sysctl_local_port_range,
 380                 .maxlen         = sizeof(sysctl_local_port_range),
 381                 .mode           = 0644,
 382                 .proc_handler   = &proc_dointvec_minmax,
 383                 .strategy       = &sysctl_intvec,
 384                 .extra1         = ip_local_port_range_min,
 385                 .extra2         = ip_local_port_range_max
 386         },
 387         {
 388                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 389                 .procname       = "icmp_echo_ignore_all",
 390                 .data           = &sysctl_icmp_echo_ignore_all,
 391                 .maxlen         = sizeof(int),
 392                 .mode           = 0644,
 393                 .proc_handler   = &proc_dointvec
 394         },
 395         {
 396                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 397                 .procname       = "icmp_echo_ignore_broadcasts",
 398                 .data           = &sysctl_icmp_echo_ignore_broadcasts,
 399                 .maxlen         = sizeof(int),
 400                 .mode           = 0644,
 401                 .proc_handler   = &proc_dointvec
 402         },
 403         {
 404                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 405                 .procname       = "icmp_ignore_bogus_error_responses",
 406                 .data           = &sysctl_icmp_ignore_bogus_error_responses,
 407                 .maxlen         = sizeof(int),
 408                 .mode           = 0644,
 409                 .proc_handler   = &proc_dointvec
 410         },
 411         {
 412                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 413                 .procname       = "icmp_errors_use_inbound_ifaddr",
 414                 .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
 415                 .maxlen         = sizeof(int),
 416                 .mode           = 0644,
 417                 .proc_handler   = &proc_dointvec
 418         },
 419         {
 420                 .ctl_name       = NET_IPV4_ROUTE,
 421                 .procname       = "route",
 422                 .maxlen         = 0,
 423                 .mode           = 0555,
 424                 .child          = ipv4_route_table
 425         },
 426 #ifdef CONFIG_IP_MULTICAST
 427         {
 428                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 429                 .procname       = "igmp_max_memberships",
 430                 .data           = &sysctl_igmp_max_memberships,
 431                 .maxlen         = sizeof(int),
 432                 .mode           = 0644,
 433                 .proc_handler   = &proc_dointvec
 434         },
 435
 436 #endif
 437         {
 438                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 439                 .procname       = "igmp_max_msf",
 440                 .data           = &sysctl_igmp_max_msf,
 441                 .maxlen         = sizeof(int),
 442                 .mode           = 0644,
 443                 .proc_handler   = &proc_dointvec
 444         },
 445         {
 446                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 447                 .procname       = "inet_peer_threshold",
 448                 .data           = &inet_peer_threshold,
 449                 .maxlen         = sizeof(int),
 450                 .mode           = 0644,
 451                 .proc_handler   = &proc_dointvec
 452         },
 453         {
 454                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 455                 .procname       = "inet_peer_minttl",
 456                 .data           = &inet_peer_minttl,
 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_MAXTTL,
 464                 .procname       = "inet_peer_maxttl",
 465                 .data           = &inet_peer_maxttl,
 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_MINTIME,
 473                 .procname       = "inet_peer_gc_mintime",
 474                 .data           = &inet_peer_gc_mintime,
 475                 .maxlen         = sizeof(int),
 476                 .mode           = 0644,
 477                 .proc_handler   = &proc_dointvec_jiffies,
 478                 .strategy       = &sysctl_jiffies
 479         },
 480         {
 481                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 482                 .procname       = "inet_peer_gc_maxtime",
 483                 .data           = &inet_peer_gc_maxtime,
 484                 .maxlen         = sizeof(int),
 485                 .mode           = 0644,
 486                 .proc_handler   = &proc_dointvec_jiffies,
 487                 .strategy       = &sysctl_jiffies
 488         },
 489         {
 490                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 491                 .procname       = "tcp_orphan_retries",
 492                 .data           = &sysctl_tcp_orphan_retries,
 493                 .maxlen         = sizeof(int),
 494                 .mode           = 0644,
 495                 .proc_handler   = &proc_dointvec
 496         },
 497         {
 498                 .ctl_name       = NET_TCP_FACK,
 499                 .procname       = "tcp_fack",
 500                 .data           = &sysctl_tcp_fack,
 501                 .maxlen         = sizeof(int),
 502                 .mode           = 0644,
 503                 .proc_handler   = &proc_dointvec
 504         },
 505         {
 506                 .ctl_name       = NET_TCP_REORDERING,
 507                 .procname       = "tcp_reordering",
 508                 .data           = &sysctl_tcp_reordering,
 509                 .maxlen         = sizeof(int),
 510                 .mode           = 0644,
 511                 .proc_handler   = &proc_dointvec
 512         },
 513         {
 514                 .ctl_name       = NET_TCP_ECN,
 515                 .procname       = "tcp_ecn",
 516                 .data           = &sysctl_tcp_ecn,
 517                 .maxlen         = sizeof(int),
 518                 .mode           = 0644,
 519                 .proc_handler   = &proc_dointvec
 520         },
 521         {
 522                 .ctl_name       = NET_TCP_DSACK,
 523                 .procname       = "tcp_dsack",
 524                 .data           = &sysctl_tcp_dsack,
 525                 .maxlen         = sizeof(int),
 526                 .mode           = 0644,
 527                 .proc_handler   = &proc_dointvec
 528         },
 529         {
 530                 .ctl_name       = NET_TCP_MEM,
 531                 .procname       = "tcp_mem",
 532                 .data           = &sysctl_tcp_mem,
 533                 .maxlen         = sizeof(sysctl_tcp_mem),
 534                 .mode           = 0644,
 535                 .proc_handler   = &proc_dointvec
 536         },
 537         {
 538                 .ctl_name       = NET_TCP_WMEM,
 539                 .procname       = "tcp_wmem",
 540                 .data           = &sysctl_tcp_wmem,
 541                 .maxlen         = sizeof(sysctl_tcp_wmem),
 542                 .mode           = 0644,
 543                 .proc_handler   = &proc_dointvec
 544         },
 545         {
 546                 .ctl_name       = NET_TCP_RMEM,
 547                 .procname       = "tcp_rmem",
 548                 .data           = &sysctl_tcp_rmem,
 549                 .maxlen         = sizeof(sysctl_tcp_rmem),
 550                 .mode           = 0644,
 551                 .proc_handler   = &proc_dointvec
 552         },
 553         {
 554                 .ctl_name       = NET_TCP_APP_WIN,
 555                 .procname       = "tcp_app_win",
 556                 .data           = &sysctl_tcp_app_win,
 557                 .maxlen         = sizeof(int),
 558                 .mode           = 0644,
 559                 .proc_handler   = &proc_dointvec
 560         },
 561         {
 562                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 563                 .procname       = "tcp_adv_win_scale",
 564                 .data           = &sysctl_tcp_adv_win_scale,
 565                 .maxlen         = sizeof(int),
 566                 .mode           = 0644,
 567                 .proc_handler   = &proc_dointvec
 568         },
 569         {
 570                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 571                 .procname       = "icmp_ratelimit",
 572                 .data           = &sysctl_icmp_ratelimit,
 573                 .maxlen         = sizeof(int),
 574                 .mode           = 0644,
 575                 .proc_handler   = &proc_dointvec
 576         },
 577         {
 578                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 579                 .procname       = "icmp_ratemask",
 580                 .data           = &sysctl_icmp_ratemask,
 581                 .maxlen         = sizeof(int),
 582                 .mode           = 0644,
 583                 .proc_handler   = &proc_dointvec
 584         },
 585         {
 586                 .ctl_name       = NET_TCP_TW_REUSE,
 587                 .procname       = "tcp_tw_reuse",
 588                 .data           = &sysctl_tcp_tw_reuse,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = &proc_dointvec
 592         },
 593         {
 594                 .ctl_name       = NET_TCP_FRTO,
 595                 .procname       = "tcp_frto",
 596                 .data           = &sysctl_tcp_frto,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = &proc_dointvec
 600         },
 601         {
 602                 .ctl_name       = NET_TCP_LOW_LATENCY,
 603                 .procname       = "tcp_low_latency",
 604                 .data           = &sysctl_tcp_low_latency,
 605                 .maxlen         = sizeof(int),
 606                 .mode           = 0644,
 607                 .proc_handler   = &proc_dointvec
 608         },
 609         {
 610                 .ctl_name       = NET_IPV4_IPFRAG_SECRET_INTERVAL,
 611                 .procname       = "ipfrag_secret_interval",
 612                 .data           = &sysctl_ipfrag_secret_interval,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec_jiffies,
 616                 .strategy       = &sysctl_jiffies
 617         },
 618         {
 619                 .ctl_name       = NET_IPV4_IPFRAG_MAX_DIST,
 620                 .procname       = "ipfrag_max_dist",
 621                 .data           = &sysctl_ipfrag_max_dist,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = &proc_dointvec_minmax,
 625                 .extra1         = &zero
 626         },
 627         {
 628                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 629                 .procname       = "tcp_no_metrics_save",
 630                 .data           = &sysctl_tcp_nometrics_save,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = &proc_dointvec,
 634         },
 635         {
 636                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 637                 .procname       = "tcp_moderate_rcvbuf",
 638                 .data           = &sysctl_tcp_moderate_rcvbuf,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 .proc_handler   = &proc_dointvec,
 642         },
 643         {
 644                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 645                 .procname       = "tcp_tso_win_divisor",
 646                 .data           = &sysctl_tcp_tso_win_divisor,
 647                 .maxlen         = sizeof(int),
 648                 .mode           = 0644,
 649                 .proc_handler   = &proc_dointvec,
 650         },
 651         {
 652                 .ctl_name       = NET_TCP_CONG_CONTROL,
 653                 .procname       = "tcp_congestion_control",
 654                 .mode           = 0644,
 655                 .maxlen         = TCP_CA_NAME_MAX,
 656                 .proc_handler   = &proc_tcp_congestion_control,
 657                 .strategy       = &sysctl_tcp_congestion_control,
 658         },
 659         {
 660                 .ctl_name       = NET_TCP_ABC,
 661                 .procname       = "tcp_abc",
 662                 .data           = &sysctl_tcp_abc,
 663                 .maxlen         = sizeof(int),
 664                 .mode           = 0644,
 665                 .proc_handler   = &proc_dointvec,
 666         },
 667
 668         { .ctl_name = 0 }
 669 };
 670
 671 #endif /* CONFIG_SYSCTL */
 672
 673 EXPORT_SYMBOL(ipv4_config);