net/ipv4/sysctl_net_ipv4.c

   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 #include <net/cipso_ipv4.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 {
  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 {
 115         char val[TCP_CA_NAME_MAX];
 116         ctl_table tbl = {
 117                 .data = val,
 118                 .maxlen = TCP_CA_NAME_MAX,
 119         };
 120         int ret;
 121
 122         tcp_get_default_congestion_control(val);
 123         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 124         if (ret == 0 && newval && newlen)
 125                 ret = tcp_set_default_congestion_control(val);
 126         return ret;
 127 }
 128
 129 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 130                                                  int write, struct file * filp,
 131                                                  void __user *buffer, size_t *lenp,
 132                                                  loff_t *ppos)
 133 {
 134         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 135         int ret;
 136
 137         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 138         if (!tbl.data)
 139                 return -ENOMEM;
 140         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 141         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 142         kfree(tbl.data);
 143         return ret;
 144 }
 145
 146 static int proc_allowed_congestion_control(ctl_table *ctl,
 147                                            int write, struct file * filp,
 148                                            void __user *buffer, size_t *lenp,
 149                                            loff_t *ppos)
 150 {
 151         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 152         int ret;
 153
 154         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 155         if (!tbl.data)
 156                 return -ENOMEM;
 157
 158         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 159         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 160         if (write && ret == 0)
 161                 ret = tcp_set_allowed_congestion_control(tbl.data);
 162         kfree(tbl.data);
 163         return ret;
 164 }
 165
 166 static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
 167                                                int nlen, void __user *oldval,
 168                                                size_t __user *oldlenp,
 169                                                void __user *newval,
 170                                                size_t newlen)
 171 {
 172         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 173         int ret;
 174
 175         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 176         if (!tbl.data)
 177                 return -ENOMEM;
 178
 179         tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
 180         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 181         if (ret == 0 && newval && newlen)
 182                 ret = tcp_set_allowed_congestion_control(tbl.data);
 183         kfree(tbl.data);
 184
 185         return ret;
 186
 187 }
 188
 189 ctl_table ipv4_table[] = {
 190         {
 191                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 192                 .procname       = "tcp_timestamps",
 193                 .data           = &sysctl_tcp_timestamps,
 194                 .maxlen         = sizeof(int),
 195                 .mode           = 0644,
 196                 .proc_handler   = &proc_dointvec
 197         },
 198         {
 199                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 200                 .procname       = "tcp_window_scaling",
 201                 .data           = &sysctl_tcp_window_scaling,
 202                 .maxlen         = sizeof(int),
 203                 .mode           = 0644,
 204                 .proc_handler   = &proc_dointvec
 205         },
 206         {
 207                 .ctl_name       = NET_IPV4_TCP_SACK,
 208                 .procname       = "tcp_sack",
 209                 .data           = &sysctl_tcp_sack,
 210                 .maxlen         = sizeof(int),
 211                 .mode           = 0644,
 212                 .proc_handler   = &proc_dointvec
 213         },
 214         {
 215                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 216                 .procname       = "tcp_retrans_collapse",
 217                 .data           = &sysctl_tcp_retrans_collapse,
 218                 .maxlen         = sizeof(int),
 219                 .mode           = 0644,
 220                 .proc_handler   = &proc_dointvec
 221         },
 222         {
 223                 .ctl_name       = NET_IPV4_FORWARD,
 224                 .procname       = "ip_forward",
 225                 .data           = &ipv4_devconf.forwarding,
 226                 .maxlen         = sizeof(int),
 227                 .mode           = 0644,
 228                 .proc_handler   = &ipv4_sysctl_forward,
 229                 .strategy       = &ipv4_sysctl_forward_strategy
 230         },
 231         {
 232                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 233                 .procname       = "ip_default_ttl",
 234                 .data           = &sysctl_ip_default_ttl,
 235                 .maxlen         = sizeof(int),
 236                 .mode           = 0644,
 237                 .proc_handler   = &ipv4_doint_and_flush,
 238                 .strategy       = &ipv4_doint_and_flush_strategy,
 239         },
 240         {
 241                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 242                 .procname       = "ip_no_pmtu_disc",
 243                 .data           = &ipv4_config.no_pmtu_disc,
 244                 .maxlen         = sizeof(int),
 245                 .mode           = 0644,
 246                 .proc_handler   = &proc_dointvec
 247         },
 248         {
 249                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 250                 .procname       = "ip_nonlocal_bind",
 251                 .data           = &sysctl_ip_nonlocal_bind,
 252                 .maxlen         = sizeof(int),
 253                 .mode           = 0644,
 254                 .proc_handler   = &proc_dointvec
 255         },
 256         {
 257                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 258                 .procname       = "tcp_syn_retries",
 259                 .data           = &sysctl_tcp_syn_retries,
 260                 .maxlen         = sizeof(int),
 261                 .mode           = 0644,
 262                 .proc_handler   = &proc_dointvec
 263         },
 264         {
 265                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 266                 .procname       = "tcp_synack_retries",
 267                 .data           = &sysctl_tcp_synack_retries,
 268                 .maxlen         = sizeof(int),
 269                 .mode           = 0644,
 270                 .proc_handler   = &proc_dointvec
 271         },
 272         {
 273                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 274                 .procname       = "tcp_max_orphans",
 275                 .data           = &sysctl_tcp_max_orphans,
 276                 .maxlen         = sizeof(int),
 277                 .mode           = 0644,
 278                 .proc_handler   = &proc_dointvec
 279         },
 280         {
 281                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 282                 .procname       = "tcp_max_tw_buckets",
 283                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 284                 .maxlen         = sizeof(int),
 285                 .mode           = 0644,
 286                 .proc_handler   = &proc_dointvec
 287         },
 288         {
 289                 .ctl_name       = NET_IPV4_IPFRAG_HIGH_THRESH,
 290                 .procname       = "ipfrag_high_thresh",
 291                 .data           = &sysctl_ipfrag_high_thresh,
 292                 .maxlen         = sizeof(int),
 293                 .mode           = 0644,
 294                 .proc_handler   = &proc_dointvec
 295         },
 296         {
 297                 .ctl_name       = NET_IPV4_IPFRAG_LOW_THRESH,
 298                 .procname       = "ipfrag_low_thresh",
 299                 .data           = &sysctl_ipfrag_low_thresh,
 300                 .maxlen         = sizeof(int),
 301                 .mode           = 0644,
 302                 .proc_handler   = &proc_dointvec
 303         },
 304         {
 305                 .ctl_name       = NET_IPV4_DYNADDR,
 306                 .procname       = "ip_dynaddr",
 307                 .data           = &sysctl_ip_dynaddr,
 308                 .maxlen         = sizeof(int),
 309                 .mode           = 0644,
 310                 .proc_handler   = &proc_dointvec
 311         },
 312         {
 313                 .ctl_name       = NET_IPV4_IPFRAG_TIME,
 314                 .procname       = "ipfrag_time",
 315                 .data           = &sysctl_ipfrag_time,
 316                 .maxlen         = sizeof(int),
 317                 .mode           = 0644,
 318                 .proc_handler   = &proc_dointvec_jiffies,
 319                 .strategy       = &sysctl_jiffies
 320         },
 321         {
 322                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 323                 .procname       = "tcp_keepalive_time",
 324                 .data           = &sysctl_tcp_keepalive_time,
 325                 .maxlen         = sizeof(int),
 326                 .mode           = 0644,
 327                 .proc_handler   = &proc_dointvec_jiffies,
 328                 .strategy       = &sysctl_jiffies
 329         },
 330         {
 331                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 332                 .procname       = "tcp_keepalive_probes",
 333                 .data           = &sysctl_tcp_keepalive_probes,
 334                 .maxlen         = sizeof(int),
 335                 .mode           = 0644,
 336                 .proc_handler   = &proc_dointvec
 337         },
 338         {
 339                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 340                 .procname       = "tcp_keepalive_intvl",
 341                 .data           = &sysctl_tcp_keepalive_intvl,
 342                 .maxlen         = sizeof(int),
 343                 .mode           = 0644,
 344                 .proc_handler   = &proc_dointvec_jiffies,
 345                 .strategy       = &sysctl_jiffies
 346         },
 347         {
 348                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 349                 .procname       = "tcp_retries1",
 350                 .data           = &sysctl_tcp_retries1,
 351                 .maxlen         = sizeof(int),
 352                 .mode           = 0644,
 353                 .proc_handler   = &proc_dointvec_minmax,
 354                 .strategy       = &sysctl_intvec,
 355                 .extra2         = &tcp_retr1_max
 356         },
 357         {
 358                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 359                 .procname       = "tcp_retries2",
 360                 .data           = &sysctl_tcp_retries2,
 361                 .maxlen         = sizeof(int),
 362                 .mode           = 0644,
 363                 .proc_handler   = &proc_dointvec
 364         },
 365         {
 366                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 367                 .procname       = "tcp_fin_timeout",
 368                 .data           = &sysctl_tcp_fin_timeout,
 369                 .maxlen         = sizeof(int),
 370                 .mode           = 0644,
 371                 .proc_handler   = &proc_dointvec_jiffies,
 372                 .strategy       = &sysctl_jiffies
 373         },
 374 #ifdef CONFIG_SYN_COOKIES
 375         {
 376                 .ctl_name       = NET_TCP_SYNCOOKIES,
 377                 .procname       = "tcp_syncookies",
 378                 .data           = &sysctl_tcp_syncookies,
 379                 .maxlen         = sizeof(int),
 380                 .mode           = 0644,
 381                 .proc_handler   = &proc_dointvec
 382         },
 383 #endif
 384         {
 385                 .ctl_name       = NET_TCP_TW_RECYCLE,
 386                 .procname       = "tcp_tw_recycle",
 387                 .data           = &tcp_death_row.sysctl_tw_recycle,
 388                 .maxlen         = sizeof(int),
 389                 .mode           = 0644,
 390                 .proc_handler   = &proc_dointvec
 391         },
 392         {
 393                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 394                 .procname       = "tcp_abort_on_overflow",
 395                 .data           = &sysctl_tcp_abort_on_overflow,
 396                 .maxlen         = sizeof(int),
 397                 .mode           = 0644,
 398                 .proc_handler   = &proc_dointvec
 399         },
 400         {
 401                 .ctl_name       = NET_TCP_STDURG,
 402                 .procname       = "tcp_stdurg",
 403                 .data           = &sysctl_tcp_stdurg,
 404                 .maxlen         = sizeof(int),
 405                 .mode           = 0644,
 406                 .proc_handler   = &proc_dointvec
 407         },
 408         {
 409                 .ctl_name       = NET_TCP_RFC1337,
 410                 .procname       = "tcp_rfc1337",
 411                 .data           = &sysctl_tcp_rfc1337,
 412                 .maxlen         = sizeof(int),
 413                 .mode           = 0644,
 414                 .proc_handler   = &proc_dointvec
 415         },
 416         {
 417                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 418                 .procname       = "tcp_max_syn_backlog",
 419                 .data           = &sysctl_max_syn_backlog,
 420                 .maxlen         = sizeof(int),
 421                 .mode           = 0644,
 422                 .proc_handler   = &proc_dointvec
 423         },
 424         {
 425                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 426                 .procname       = "ip_local_port_range",
 427                 .data           = &sysctl_local_port_range,
 428                 .maxlen         = sizeof(sysctl_local_port_range),
 429                 .mode           = 0644,
 430                 .proc_handler   = &proc_dointvec_minmax,
 431                 .strategy       = &sysctl_intvec,
 432                 .extra1         = ip_local_port_range_min,
 433                 .extra2         = ip_local_port_range_max
 434         },
 435         {
 436                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 437                 .procname       = "icmp_echo_ignore_all",
 438                 .data           = &sysctl_icmp_echo_ignore_all,
 439                 .maxlen         = sizeof(int),
 440                 .mode           = 0644,
 441                 .proc_handler   = &proc_dointvec
 442         },
 443         {
 444                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 445                 .procname       = "icmp_echo_ignore_broadcasts",
 446                 .data           = &sysctl_icmp_echo_ignore_broadcasts,
 447                 .maxlen         = sizeof(int),
 448                 .mode           = 0644,
 449                 .proc_handler   = &proc_dointvec
 450         },
 451         {
 452                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 453                 .procname       = "icmp_ignore_bogus_error_responses",
 454                 .data           = &sysctl_icmp_ignore_bogus_error_responses,
 455                 .maxlen         = sizeof(int),
 456                 .mode           = 0644,
 457                 .proc_handler   = &proc_dointvec
 458         },
 459 #ifdef CONFIG_ICMP_IPOD
 460         {
 461                 .ctl_name       = NET_IPV4_ICMP_IPOD_VERSION,
 462                 .procname       = "icmp_ipod_version",
 463                 .data           = &sysctl_icmp_ipod_version,
 464                 .maxlen         = sizeof(sysctl_icmp_ipod_version),
 465                 .mode           = 0444,
 466                 .proc_handler   = &proc_dointvec
 467         },
 468         {
 469                 .ctl_name       = NET_IPV4_ICMP_IPOD_ENABLED,
 470                 .procname       = "icmp_ipod_enabled",
 471                 .data           = &sysctl_icmp_ipod_enabled,
 472                 .maxlen         = sizeof(sysctl_icmp_ipod_enabled),
 473                 .mode           = 0644,
 474                 .proc_handler   = &proc_dointvec
 475         },
 476         {
 477                 .ctl_name       = NET_IPV4_ICMP_IPOD_HOST,
 478                 .procname       = "icmp_ipod_host",
 479                 .data           = &sysctl_icmp_ipod_host,
 480                 .maxlen         = sizeof(sysctl_icmp_ipod_host),
 481                 .mode           = 0644,
 482                 .proc_handler   = &proc_dointvec
 483         },
 484         {
 485                 .ctl_name       = NET_IPV4_ICMP_IPOD_MASK,
 486                 .procname       = "icmp_ipod_mask",
 487                 .data           = &sysctl_icmp_ipod_mask,
 488                 .maxlen         = sizeof(sysctl_icmp_ipod_mask),
 489                 .mode           = 0644,
 490                 .proc_handler   = &proc_dointvec
 491         },
 492         {
 493                 .ctl_name       = NET_IPV4_ICMP_IPOD_KEY,
 494                 .procname       = "icmp_ipod_key",
 495                 .data           = &sysctl_icmp_ipod_key,
 496                 .maxlen         = sizeof(sysctl_icmp_ipod_key),
 497                 .mode           = 0600,
 498                 .proc_handler   = &proc_dostring,
 499                 .strategy       = &sysctl_string
 500         },
 501 #endif
 502         {
 503                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 504                 .procname       = "icmp_errors_use_inbound_ifaddr",
 505                 .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
 506                 .maxlen         = sizeof(int),
 507                 .mode           = 0644,
 508                 .proc_handler   = &proc_dointvec
 509         },
 510         {
 511                 .ctl_name       = NET_IPV4_ROUTE,
 512                 .procname       = "route",
 513                 .maxlen         = 0,
 514                 .mode           = 0555,
 515                 .child          = ipv4_route_table
 516         },
 517 #ifdef CONFIG_IP_MULTICAST
 518         {
 519                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 520                 .procname       = "igmp_max_memberships",
 521                 .data           = &sysctl_igmp_max_memberships,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = &proc_dointvec
 525         },
 526
 527 #endif
 528         {
 529                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 530                 .procname       = "igmp_max_msf",
 531                 .data           = &sysctl_igmp_max_msf,
 532                 .maxlen         = sizeof(int),
 533                 .mode           = 0644,
 534                 .proc_handler   = &proc_dointvec
 535         },
 536         {
 537                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 538                 .procname       = "inet_peer_threshold",
 539                 .data           = &inet_peer_threshold,
 540                 .maxlen         = sizeof(int),
 541                 .mode           = 0644,
 542                 .proc_handler   = &proc_dointvec
 543         },
 544         {
 545                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 546                 .procname       = "inet_peer_minttl",
 547                 .data           = &inet_peer_minttl,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = &proc_dointvec_jiffies,
 551                 .strategy       = &sysctl_jiffies
 552         },
 553         {
 554                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 555                 .procname       = "inet_peer_maxttl",
 556                 .data           = &inet_peer_maxttl,
 557                 .maxlen         = sizeof(int),
 558                 .mode           = 0644,
 559                 .proc_handler   = &proc_dointvec_jiffies,
 560                 .strategy       = &sysctl_jiffies
 561         },
 562         {
 563                 .ctl_name       = NET_IPV4_INET_PEER_GC_MINTIME,
 564                 .procname       = "inet_peer_gc_mintime",
 565                 .data           = &inet_peer_gc_mintime,
 566                 .maxlen         = sizeof(int),
 567                 .mode           = 0644,
 568                 .proc_handler   = &proc_dointvec_jiffies,
 569                 .strategy       = &sysctl_jiffies
 570         },
 571         {
 572                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 573                 .procname       = "inet_peer_gc_maxtime",
 574                 .data           = &inet_peer_gc_maxtime,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec_jiffies,
 578                 .strategy       = &sysctl_jiffies
 579         },
 580         {
 581                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 582                 .procname       = "tcp_orphan_retries",
 583                 .data           = &sysctl_tcp_orphan_retries,
 584                 .maxlen         = sizeof(int),
 585                 .mode           = 0644,
 586                 .proc_handler   = &proc_dointvec
 587         },
 588         {
 589                 .ctl_name       = NET_TCP_FACK,
 590                 .procname       = "tcp_fack",
 591                 .data           = &sysctl_tcp_fack,
 592                 .maxlen         = sizeof(int),
 593                 .mode           = 0644,
 594                 .proc_handler   = &proc_dointvec
 595         },
 596         {
 597                 .ctl_name       = NET_TCP_REORDERING,
 598                 .procname       = "tcp_reordering",
 599                 .data           = &sysctl_tcp_reordering,
 600                 .maxlen         = sizeof(int),
 601                 .mode           = 0644,
 602                 .proc_handler   = &proc_dointvec
 603         },
 604         {
 605                 .ctl_name       = NET_TCP_ECN,
 606                 .procname       = "tcp_ecn",
 607                 .data           = &sysctl_tcp_ecn,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec
 611         },
 612         {
 613                 .ctl_name       = NET_TCP_DSACK,
 614                 .procname       = "tcp_dsack",
 615                 .data           = &sysctl_tcp_dsack,
 616                 .maxlen         = sizeof(int),
 617                 .mode           = 0644,
 618                 .proc_handler   = &proc_dointvec
 619         },
 620         {
 621                 .ctl_name       = NET_TCP_MEM,
 622                 .procname       = "tcp_mem",
 623                 .data           = &sysctl_tcp_mem,
 624                 .maxlen         = sizeof(sysctl_tcp_mem),
 625                 .mode           = 0644,
 626                 .proc_handler   = &proc_dointvec
 627         },
 628         {
 629                 .ctl_name       = NET_TCP_WMEM,
 630                 .procname       = "tcp_wmem",
 631                 .data           = &sysctl_tcp_wmem,
 632                 .maxlen         = sizeof(sysctl_tcp_wmem),
 633                 .mode           = 0644,
 634                 .proc_handler   = &proc_dointvec
 635         },
 636         {
 637                 .ctl_name       = NET_TCP_RMEM,
 638                 .procname       = "tcp_rmem",
 639                 .data           = &sysctl_tcp_rmem,
 640                 .maxlen         = sizeof(sysctl_tcp_rmem),
 641                 .mode           = 0644,
 642                 .proc_handler   = &proc_dointvec
 643         },
 644         {
 645                 .ctl_name       = NET_TCP_APP_WIN,
 646                 .procname       = "tcp_app_win",
 647                 .data           = &sysctl_tcp_app_win,
 648                 .maxlen         = sizeof(int),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec
 651         },
 652         {
 653                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 654                 .procname       = "tcp_adv_win_scale",
 655                 .data           = &sysctl_tcp_adv_win_scale,
 656                 .maxlen         = sizeof(int),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_dointvec
 659         },
 660         {
 661                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 662                 .procname       = "icmp_ratelimit",
 663                 .data           = &sysctl_icmp_ratelimit,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 .proc_handler   = &proc_dointvec
 667         },
 668         {
 669                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 670                 .procname       = "icmp_ratemask",
 671                 .data           = &sysctl_icmp_ratemask,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = &proc_dointvec
 675         },
 676         {
 677                 .ctl_name       = NET_TCP_TW_REUSE,
 678                 .procname       = "tcp_tw_reuse",
 679                 .data           = &sysctl_tcp_tw_reuse,
 680                 .maxlen         = sizeof(int),
 681                 .mode           = 0644,
 682                 .proc_handler   = &proc_dointvec
 683         },
 684         {
 685                 .ctl_name       = NET_TCP_FRTO,
 686                 .procname       = "tcp_frto",
 687                 .data           = &sysctl_tcp_frto,
 688                 .maxlen         = sizeof(int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_dointvec
 691         },
 692         {
 693                 .ctl_name       = NET_TCP_LOW_LATENCY,
 694                 .procname       = "tcp_low_latency",
 695                 .data           = &sysctl_tcp_low_latency,
 696                 .maxlen         = sizeof(int),
 697                 .mode           = 0644,
 698                 .proc_handler   = &proc_dointvec
 699         },
 700         {
 701                 .ctl_name       = NET_IPV4_IPFRAG_SECRET_INTERVAL,
 702                 .procname       = "ipfrag_secret_interval",
 703                 .data           = &sysctl_ipfrag_secret_interval,
 704                 .maxlen         = sizeof(int),
 705                 .mode           = 0644,
 706                 .proc_handler   = &proc_dointvec_jiffies,
 707                 .strategy       = &sysctl_jiffies
 708         },
 709         {
 710                 .ctl_name       = NET_IPV4_IPFRAG_MAX_DIST,
 711                 .procname       = "ipfrag_max_dist",
 712                 .data           = &sysctl_ipfrag_max_dist,
 713                 .maxlen         = sizeof(int),
 714                 .mode           = 0644,
 715                 .proc_handler   = &proc_dointvec_minmax,
 716                 .extra1         = &zero
 717         },
 718         {
 719                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 720                 .procname       = "tcp_no_metrics_save",
 721                 .data           = &sysctl_tcp_nometrics_save,
 722                 .maxlen         = sizeof(int),
 723                 .mode           = 0644,
 724                 .proc_handler   = &proc_dointvec,
 725         },
 726         {
 727                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 728                 .procname       = "tcp_moderate_rcvbuf",
 729                 .data           = &sysctl_tcp_moderate_rcvbuf,
 730                 .maxlen         = sizeof(int),
 731                 .mode           = 0644,
 732                 .proc_handler   = &proc_dointvec,
 733         },
 734         {
 735                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 736                 .procname       = "tcp_tso_win_divisor",
 737                 .data           = &sysctl_tcp_tso_win_divisor,
 738                 .maxlen         = sizeof(int),
 739                 .mode           = 0644,
 740                 .proc_handler   = &proc_dointvec,
 741         },
 742         {
 743                 .ctl_name       = NET_TCP_CONG_CONTROL,
 744                 .procname       = "tcp_congestion_control",
 745                 .mode           = 0644,
 746                 .maxlen         = TCP_CA_NAME_MAX,
 747                 .proc_handler   = &proc_tcp_congestion_control,
 748                 .strategy       = &sysctl_tcp_congestion_control,
 749         },
 750         {
 751                 .ctl_name       = NET_TCP_ABC,
 752                 .procname       = "tcp_abc",
 753                 .data           = &sysctl_tcp_abc,
 754                 .maxlen         = sizeof(int),
 755                 .mode           = 0644,
 756                 .proc_handler   = &proc_dointvec,
 757         },
 758         {
 759                 .ctl_name       = NET_TCP_MTU_PROBING,
 760                 .procname       = "tcp_mtu_probing",
 761                 .data           = &sysctl_tcp_mtu_probing,
 762                 .maxlen         = sizeof(int),
 763                 .mode           = 0644,
 764                 .proc_handler   = &proc_dointvec,
 765         },
 766         {
 767                 .ctl_name       = NET_TCP_BASE_MSS,
 768                 .procname       = "tcp_base_mss",
 769                 .data           = &sysctl_tcp_base_mss,
 770                 .maxlen         = sizeof(int),
 771                 .mode           = 0644,
 772                 .proc_handler   = &proc_dointvec,
 773         },
 774         {
 775                 .ctl_name       = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
 776                 .procname       = "tcp_workaround_signed_windows",
 777                 .data           = &sysctl_tcp_workaround_signed_windows,
 778                 .maxlen         = sizeof(int),
 779                 .mode           = 0644,
 780                 .proc_handler   = &proc_dointvec
 781         },
 782 #ifdef CONFIG_NET_DMA
 783         {
 784                 .ctl_name       = NET_TCP_DMA_COPYBREAK,
 785                 .procname       = "tcp_dma_copybreak",
 786                 .data           = &sysctl_tcp_dma_copybreak,
 787                 .maxlen         = sizeof(int),
 788                 .mode           = 0644,
 789                 .proc_handler   = &proc_dointvec
 790         },
 791 #endif
 792         {
 793                 .ctl_name       = NET_TCP_SLOW_START_AFTER_IDLE,
 794                 .procname       = "tcp_slow_start_after_idle",
 795                 .data           = &sysctl_tcp_slow_start_after_idle,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = &proc_dointvec
 799         },
 800 #ifdef CONFIG_NETLABEL
 801         {
 802                 .ctl_name       = NET_CIPSOV4_CACHE_ENABLE,
 803                 .procname       = "cipso_cache_enable",
 804                 .data           = &cipso_v4_cache_enabled,
 805                 .maxlen         = sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = &proc_dointvec,
 808         },
 809         {
 810                 .ctl_name       = NET_CIPSOV4_CACHE_BUCKET_SIZE,
 811                 .procname       = "cipso_cache_bucket_size",
 812                 .data           = &cipso_v4_cache_bucketsize,
 813                 .maxlen         = sizeof(int),
 814                 .mode           = 0644,
 815                 .proc_handler   = &proc_dointvec,
 816         },
 817         {
 818                 .ctl_name       = NET_CIPSOV4_RBM_OPTFMT,
 819                 .procname       = "cipso_rbm_optfmt",
 820                 .data           = &cipso_v4_rbm_optfmt,
 821                 .maxlen         = sizeof(int),
 822                 .mode           = 0644,
 823                 .proc_handler   = &proc_dointvec,
 824         },
 825         {
 826                 .ctl_name       = NET_CIPSOV4_RBM_STRICTVALID,
 827                 .procname       = "cipso_rbm_strictvalid",
 828                 .data           = &cipso_v4_rbm_strictvalid,
 829                 .maxlen         = sizeof(int),
 830                 .mode           = 0644,
 831                 .proc_handler   = &proc_dointvec,
 832         },
 833 #endif /* CONFIG_NETLABEL */
 834         {
 835                 .ctl_name       = NET_TCP_AVAIL_CONG_CONTROL,
 836                 .procname       = "tcp_available_congestion_control",
 837                 .maxlen         = TCP_CA_BUF_MAX,
 838                 .mode           = 0444,
 839                 .proc_handler   = &proc_tcp_available_congestion_control,
 840         },
 841         {
 842                 .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
 843                 .procname       = "tcp_allowed_congestion_control",
 844                 .maxlen         = TCP_CA_BUF_MAX,
 845                 .mode           = 0644,
 846                 .proc_handler   = &proc_allowed_congestion_control,
 847                 .strategy       = &strategy_allowed_congestion_control,
 848         },
 849         { .ctl_name = 0 }
 850 };
 851
 852 #endif /* CONFIG_SYSCTL */
 853
 854 EXPORT_SYMBOL(ipv4_config);