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/config.h>
  14 #include <net/snmp.h>
  15 #include <net/ip.h>
  16 #include <net/route.h>
  17 #include <net/tcp.h>
  18
  19 /* From af_inet.c */
  20 extern int sysctl_ip_nonlocal_bind;
  21
  22 /* From icmp.c */
  23 extern int sysctl_icmp_echo_ignore_all;
  24 extern int sysctl_icmp_echo_ignore_broadcasts;
  25 extern int sysctl_icmp_ignore_bogus_error_responses;
  26 extern int sysctl_icmp_errors_use_inbound_ifaddr;
  27 #ifdef CONFIG_ICMP_IPOD
  28 extern int sysctl_icmp_ipod_version;
  29 extern int sysctl_icmp_ipod_enabled;
  30 extern u32 sysctl_icmp_ipod_host;
  31 extern u32 sysctl_icmp_ipod_mask;
  32 extern char sysctl_icmp_ipod_key[32+1];
  33 #endif
  34
  35 /* From ip_fragment.c */
  36 extern int sysctl_ipfrag_low_thresh;
  37 extern int sysctl_ipfrag_high_thresh;
  38 extern int sysctl_ipfrag_time;
  39 extern int sysctl_ipfrag_secret_interval;
  40
  41 /* From ip_output.c */
  42 extern int sysctl_ip_dynaddr;
  43
  44 /* From icmp.c */
  45 extern int sysctl_icmp_ratelimit;
  46 extern int sysctl_icmp_ratemask;
  47
  48 /* From igmp.c */
  49 extern int sysctl_igmp_max_memberships;
  50 extern int sysctl_igmp_max_msf;
  51
  52 /* From inetpeer.c */
  53 extern int inet_peer_threshold;
  54 extern int inet_peer_minttl;
  55 extern int inet_peer_maxttl;
  56 extern int inet_peer_gc_mintime;
  57 extern int inet_peer_gc_maxtime;
  58
  59 #ifdef CONFIG_SYSCTL
  60 static int tcp_retr1_max = 255;
  61 static int ip_local_port_range_min[] = { 1, 1 };
  62 static int ip_local_port_range_max[] = { 65535, 65535 };
  63 #endif
  64
  65 struct ipv4_config ipv4_config;
  66
  67 extern ctl_table ipv4_route_table[];
  68
  69 #ifdef CONFIG_SYSCTL
  70
  71 static
  72 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
  73                         void __user *buffer, size_t *lenp, loff_t *ppos)
  74 {
  75         int val = ipv4_devconf.forwarding;
  76         int ret;
  77
  78         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
  79
  80         if (write && ipv4_devconf.forwarding != val)
  81                 inet_forward_change();
  82
  83         return ret;
  84 }
  85
  86 static int ipv4_sysctl_forward_strategy(ctl_table *table,
  87                          int __user *name, int nlen,
  88                          void __user *oldval, size_t __user *oldlenp,
  89                          void __user *newval, size_t newlen,
  90                          void **context)
  91 {
  92         int *valp = table->data;
  93         int new;
  94
  95         if (!newval || !newlen)
  96                 return 0;
  97
  98         if (newlen != sizeof(int))
  99                 return -EINVAL;
 100
 101         if (get_user(new, (int __user *)newval))
 102                 return -EFAULT;
 103
 104         if (new == *valp)
 105                 return 0;
 106
 107         if (oldval && oldlenp) {
 108                 size_t len;
 109
 110                 if (get_user(len, oldlenp))
 111                         return -EFAULT;
 112
 113                 if (len) {
 114                         if (len > table->maxlen)
 115                                 len = table->maxlen;
 116                         if (copy_to_user(oldval, valp, len))
 117                                 return -EFAULT;
 118                         if (put_user(len, oldlenp))
 119                                 return -EFAULT;
 120                 }
 121         }
 122
 123         *valp = new;
 124         inet_forward_change();
 125         return 1;
 126 }
 127
 128 ctl_table ipv4_table[] = {
 129         {
 130                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 131                 .procname       = "tcp_timestamps",
 132                 .data           = &sysctl_tcp_timestamps,
 133                 .maxlen         = sizeof(int),
 134                 .mode           = 0644,
 135                 .proc_handler   = &proc_dointvec
 136         },
 137         {
 138                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 139                 .procname       = "tcp_window_scaling",
 140                 .data           = &sysctl_tcp_window_scaling,
 141                 .maxlen         = sizeof(int),
 142                 .mode           = 0644,
 143                 .proc_handler   = &proc_dointvec
 144         },
 145         {
 146                 .ctl_name       = NET_IPV4_TCP_SACK,
 147                 .procname       = "tcp_sack",
 148                 .data           = &sysctl_tcp_sack,
 149                 .maxlen         = sizeof(int),
 150                 .mode           = 0644,
 151                 .proc_handler   = &proc_dointvec
 152         },
 153         {
 154                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 155                 .procname       = "tcp_retrans_collapse",
 156                 .data           = &sysctl_tcp_retrans_collapse,
 157                 .maxlen         = sizeof(int),
 158                 .mode           = 0644,
 159                 .proc_handler   = &proc_dointvec
 160         },
 161         {
 162                 .ctl_name       = NET_IPV4_FORWARD,
 163                 .procname       = "ip_forward",
 164                 .data           = &ipv4_devconf.forwarding,
 165                 .maxlen         = sizeof(int),
 166                 .mode           = 0644,
 167                 .proc_handler   = &ipv4_sysctl_forward,
 168                 .strategy       = &ipv4_sysctl_forward_strategy
 169         },
 170         {
 171                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 172                 .procname       = "ip_default_ttl",
 173                 .data           = &sysctl_ip_default_ttl,
 174                 .maxlen         = sizeof(int),
 175                 .mode           = 0644,
 176                 .proc_handler   = &ipv4_doint_and_flush,
 177                 .strategy       = &ipv4_doint_and_flush_strategy,
 178         },
 179         {
 180                 .ctl_name       = NET_IPV4_AUTOCONFIG,
 181                 .procname       = "ip_autoconfig",
 182                 .data           = &ipv4_config.autoconfig,
 183                 .maxlen         = sizeof(int),
 184                 .mode           = 0644,
 185                 .proc_handler   = &proc_dointvec
 186         },
 187         {
 188                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 189                 .procname       = "ip_no_pmtu_disc",
 190                 .data           = &ipv4_config.no_pmtu_disc,
 191                 .maxlen         = sizeof(int),
 192                 .mode           = 0644,
 193                 .proc_handler   = &proc_dointvec
 194         },
 195         {
 196                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 197                 .procname       = "ip_nonlocal_bind",
 198                 .data           = &sysctl_ip_nonlocal_bind,
 199                 .maxlen         = sizeof(int),
 200                 .mode           = 0644,
 201                 .proc_handler   = &proc_dointvec
 202         },
 203         {
 204                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 205                 .procname       = "tcp_syn_retries",
 206                 .data           = &sysctl_tcp_syn_retries,
 207                 .maxlen         = sizeof(int),
 208                 .mode           = 0644,
 209                 .proc_handler   = &proc_dointvec
 210         },
 211         {
 212                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 213                 .procname       = "tcp_synack_retries",
 214                 .data           = &sysctl_tcp_synack_retries,
 215                 .maxlen         = sizeof(int),
 216                 .mode           = 0644,
 217                 .proc_handler   = &proc_dointvec
 218         },
 219         {
 220                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 221                 .procname       = "tcp_max_orphans",
 222                 .data           = &sysctl_tcp_max_orphans,
 223                 .maxlen         = sizeof(int),
 224                 .mode           = 0644,
 225                 .proc_handler   = &proc_dointvec
 226         },
 227         {
 228                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 229                 .procname       = "tcp_max_tw_buckets",
 230                 .data           = &sysctl_tcp_max_tw_buckets,
 231                 .maxlen         = sizeof(int),
 232                 .mode           = 0644,
 233                 .proc_handler   = &proc_dointvec
 234         },
 235         {
 236                 .ctl_name       = NET_IPV4_IPFRAG_HIGH_THRESH,
 237                 .procname       = "ipfrag_high_thresh",
 238                 .data           = &sysctl_ipfrag_high_thresh,
 239                 .maxlen         = sizeof(int),
 240                 .mode           = 0644,
 241                 .proc_handler   = &proc_dointvec
 242         },
 243         {
 244                 .ctl_name       = NET_IPV4_IPFRAG_LOW_THRESH,
 245                 .procname       = "ipfrag_low_thresh",
 246                 .data           = &sysctl_ipfrag_low_thresh,
 247                 .maxlen         = sizeof(int),
 248                 .mode           = 0644,
 249                 .proc_handler   = &proc_dointvec
 250         },
 251         {
 252                 .ctl_name       = NET_IPV4_DYNADDR,
 253                 .procname       = "ip_dynaddr",
 254                 .data           = &sysctl_ip_dynaddr,
 255                 .maxlen         = sizeof(int),
 256                 .mode           = 0644,
 257                 .proc_handler   = &proc_dointvec
 258         },
 259         {
 260                 .ctl_name       = NET_IPV4_IPFRAG_TIME,
 261                 .procname       = "ipfrag_time",
 262                 .data           = &sysctl_ipfrag_time,
 263                 .maxlen         = sizeof(int),
 264                 .mode           = 0644,
 265                 .proc_handler   = &proc_dointvec_jiffies,
 266                 .strategy       = &sysctl_jiffies
 267         },
 268         {
 269                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 270                 .procname       = "tcp_keepalive_time",
 271                 .data           = &sysctl_tcp_keepalive_time,
 272                 .maxlen         = sizeof(int),
 273                 .mode           = 0644,
 274                 .proc_handler   = &proc_dointvec_jiffies,
 275                 .strategy       = &sysctl_jiffies
 276         },
 277         {
 278                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 279                 .procname       = "tcp_keepalive_probes",
 280                 .data           = &sysctl_tcp_keepalive_probes,
 281                 .maxlen         = sizeof(int),
 282                 .mode           = 0644,
 283                 .proc_handler   = &proc_dointvec
 284         },
 285         {
 286                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 287                 .procname       = "tcp_keepalive_intvl",
 288                 .data           = &sysctl_tcp_keepalive_intvl,
 289                 .maxlen         = sizeof(int),
 290                 .mode           = 0644,
 291                 .proc_handler   = &proc_dointvec_jiffies,
 292                 .strategy       = &sysctl_jiffies
 293         },
 294         {
 295                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 296                 .procname       = "tcp_retries1",
 297                 .data           = &sysctl_tcp_retries1,
 298                 .maxlen         = sizeof(int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec_minmax,
 301                 .strategy       = &sysctl_intvec,
 302                 .extra2         = &tcp_retr1_max
 303         },
 304         {
 305                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 306                 .procname       = "tcp_retries2",
 307                 .data           = &sysctl_tcp_retries2,
 308                 .maxlen         = sizeof(int),
 309                 .mode           = 0644,
 310                 .proc_handler   = &proc_dointvec
 311         },
 312         {
 313                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 314                 .procname       = "tcp_fin_timeout",
 315                 .data           = &sysctl_tcp_fin_timeout,
 316                 .maxlen         = sizeof(int),
 317                 .mode           = 0644,
 318                 .proc_handler   = &proc_dointvec_jiffies,
 319                 .strategy       = &sysctl_jiffies
 320         },
 321 #ifdef CONFIG_SYN_COOKIES
 322         {
 323                 .ctl_name       = NET_TCP_SYNCOOKIES,
 324                 .procname       = "tcp_syncookies",
 325                 .data           = &sysctl_tcp_syncookies,
 326                 .maxlen         = sizeof(int),
 327                 .mode           = 0644,
 328                 .proc_handler   = &proc_dointvec
 329         },
 330 #endif
 331         {
 332                 .ctl_name       = NET_TCP_TW_RECYCLE,
 333                 .procname       = "tcp_tw_recycle",
 334                 .data           = &sysctl_tcp_tw_recycle,
 335                 .maxlen         = sizeof(int),
 336                 .mode           = 0644,
 337                 .proc_handler   = &proc_dointvec
 338         },
 339         {
 340                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 341                 .procname       = "tcp_abort_on_overflow",
 342                 .data           = &sysctl_tcp_abort_on_overflow,
 343                 .maxlen         = sizeof(int),
 344                 .mode           = 0644,
 345                 .proc_handler   = &proc_dointvec
 346         },
 347         {
 348                 .ctl_name       = NET_TCP_STDURG,
 349                 .procname       = "tcp_stdurg",
 350                 .data           = &sysctl_tcp_stdurg,
 351                 .maxlen         = sizeof(int),
 352                 .mode           = 0644,
 353                 .proc_handler   = &proc_dointvec
 354         },
 355         {
 356                 .ctl_name       = NET_TCP_RFC1337,
 357                 .procname       = "tcp_rfc1337",
 358                 .data           = &sysctl_tcp_rfc1337,
 359                 .maxlen         = sizeof(int),
 360                 .mode           = 0644,
 361                 .proc_handler   = &proc_dointvec
 362         },
 363         {
 364                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 365                 .procname       = "tcp_max_syn_backlog",
 366                 .data           = &sysctl_max_syn_backlog,
 367                 .maxlen         = sizeof(int),
 368                 .mode           = 0644,
 369                 .proc_handler   = &proc_dointvec
 370         },
 371         {
 372                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 373                 .procname       = "ip_local_port_range",
 374                 .data           = &sysctl_local_port_range,
 375                 .maxlen         = sizeof(sysctl_local_port_range),
 376                 .mode           = 0644,
 377                 .proc_handler   = &proc_dointvec_minmax,
 378                 .strategy       = &sysctl_intvec,
 379                 .extra1         = ip_local_port_range_min,
 380                 .extra2         = ip_local_port_range_max
 381         },
 382         {
 383                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 384                 .procname       = "icmp_echo_ignore_all",
 385                 .data           = &sysctl_icmp_echo_ignore_all,
 386                 .maxlen         = sizeof(int),
 387                 .mode           = 0644,
 388                 .proc_handler   = &proc_dointvec
 389         },
 390         {
 391                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 392                 .procname       = "icmp_echo_ignore_broadcasts",
 393                 .data           = &sysctl_icmp_echo_ignore_broadcasts,
 394                 .maxlen         = sizeof(int),
 395                 .mode           = 0644,
 396                 .proc_handler   = &proc_dointvec
 397         },
 398         {
 399                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 400                 .procname       = "icmp_ignore_bogus_error_responses",
 401                 .data           = &sysctl_icmp_ignore_bogus_error_responses,
 402                 .maxlen         = sizeof(int),
 403                 .mode           = 0644,
 404                 .proc_handler   = &proc_dointvec
 405         },
 406 #ifdef CONFIG_ICMP_IPOD
 407         {
 408                 .ctl_name       = NET_IPV4_ICMP_IPOD_VERSION,
 409                 .procname       = "icmp_ipod_version",
 410                 .data           = &sysctl_icmp_ipod_version,
 411                 .maxlen         = sizeof(sysctl_icmp_ipod_version),
 412                 .mode           = 0444,
 413                 .proc_handler   = &proc_dointvec
 414         },
 415         {
 416                 .ctl_name       = NET_IPV4_ICMP_IPOD_ENABLED,
 417                 .procname       = "icmp_ipod_enabled",
 418                 .data           = &sysctl_icmp_ipod_enabled,
 419                 .maxlen         = sizeof(sysctl_icmp_ipod_enabled),
 420                 .mode           = 0644,
 421                 .proc_handler   = &proc_dointvec
 422         },
 423         {
 424                 .ctl_name       = NET_IPV4_ICMP_IPOD_HOST,
 425                 .procname       = "icmp_ipod_host",
 426                 .data           = &sysctl_icmp_ipod_host,
 427                 .maxlen         = sizeof(sysctl_icmp_ipod_host),
 428                 .mode           = 0644,
 429                 .proc_handler   = &proc_dointvec
 430         },
 431         {
 432                 .ctl_name       = NET_IPV4_ICMP_IPOD_MASK,
 433                 .procname       = "icmp_ipod_mask",
 434                 .data           = &sysctl_icmp_ipod_mask,
 435                 .maxlen         = sizeof(sysctl_icmp_ipod_mask),
 436                 .mode           = 0644,
 437                 .proc_handler   = &proc_dointvec
 438         },
 439         {
 440                 .ctl_name       = NET_IPV4_ICMP_IPOD_KEY,
 441                 .procname       = "icmp_ipod_key",
 442                 .data           = &sysctl_icmp_ipod_key,
 443                 .maxlen         = sizeof(sysctl_icmp_ipod_key),
 444                 .mode           = 0600,
 445                 .proc_handler   = &proc_dostring,
 446                 .strategy       = &sysctl_string
 447         },
 448 #endif
 449         {
 450                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 451                 .procname       = "icmp_errors_use_inbound_ifaddr",
 452                 .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
 453                 .maxlen         = sizeof(int),
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dointvec
 456         },
 457         {
 458                 .ctl_name       = NET_IPV4_ROUTE,
 459                 .procname       = "route",
 460                 .maxlen         = 0,
 461                 .mode           = 0555,
 462                 .child          = ipv4_route_table
 463         },
 464 #ifdef CONFIG_IP_MULTICAST
 465         {
 466                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 467                 .procname       = "igmp_max_memberships",
 468                 .data           = &sysctl_igmp_max_memberships,
 469                 .maxlen         = sizeof(int),
 470                 .mode           = 0644,
 471                 .proc_handler   = &proc_dointvec
 472         },
 473
 474 #endif
 475         {
 476                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 477                 .procname       = "igmp_max_msf",
 478                 .data           = &sysctl_igmp_max_msf,
 479                 .maxlen         = sizeof(int),
 480                 .mode           = 0644,
 481                 .proc_handler   = &proc_dointvec
 482         },
 483         {
 484                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 485                 .procname       = "inet_peer_threshold",
 486                 .data           = &inet_peer_threshold,
 487                 .maxlen         = sizeof(int),
 488                 .mode           = 0644,
 489                 .proc_handler   = &proc_dointvec
 490         },
 491         {
 492                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 493                 .procname       = "inet_peer_minttl",
 494                 .data           = &inet_peer_minttl,
 495                 .maxlen         = sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = &proc_dointvec_jiffies,
 498                 .strategy       = &sysctl_jiffies
 499         },
 500         {
 501                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 502                 .procname       = "inet_peer_maxttl",
 503                 .data           = &inet_peer_maxttl,
 504                 .maxlen         = sizeof(int),
 505                 .mode           = 0644,
 506                 .proc_handler   = &proc_dointvec_jiffies,
 507                 .strategy       = &sysctl_jiffies
 508         },
 509         {
 510                 .ctl_name       = NET_IPV4_INET_PEER_GC_MINTIME,
 511                 .procname       = "inet_peer_gc_mintime",
 512                 .data           = &inet_peer_gc_mintime,
 513                 .maxlen         = sizeof(int),
 514                 .mode           = 0644,
 515                 .proc_handler   = &proc_dointvec_jiffies,
 516                 .strategy       = &sysctl_jiffies
 517         },
 518         {
 519                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 520                 .procname       = "inet_peer_gc_maxtime",
 521                 .data           = &inet_peer_gc_maxtime,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = &proc_dointvec_jiffies,
 525                 .strategy       = &sysctl_jiffies
 526         },
 527         {
 528                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 529                 .procname       = "tcp_orphan_retries",
 530                 .data           = &sysctl_tcp_orphan_retries,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = &proc_dointvec
 534         },
 535         {
 536                 .ctl_name       = NET_TCP_FACK,
 537                 .procname       = "tcp_fack",
 538                 .data           = &sysctl_tcp_fack,
 539                 .maxlen         = sizeof(int),
 540                 .mode           = 0644,
 541                 .proc_handler   = &proc_dointvec
 542         },
 543         {
 544                 .ctl_name       = NET_TCP_REORDERING,
 545                 .procname       = "tcp_reordering",
 546                 .data           = &sysctl_tcp_reordering,
 547                 .maxlen         = sizeof(int),
 548                 .mode           = 0644,
 549                 .proc_handler   = &proc_dointvec
 550         },
 551         {
 552                 .ctl_name       = NET_TCP_ECN,
 553                 .procname       = "tcp_ecn",
 554                 .data           = &sysctl_tcp_ecn,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = &proc_dointvec
 558         },
 559         {
 560                 .ctl_name       = NET_TCP_DSACK,
 561                 .procname       = "tcp_dsack",
 562                 .data           = &sysctl_tcp_dsack,
 563                 .maxlen         = sizeof(int),
 564                 .mode           = 0644,
 565                 .proc_handler   = &proc_dointvec
 566         },
 567         {
 568                 .ctl_name       = NET_TCP_MEM,
 569                 .procname       = "tcp_mem",
 570                 .data           = &sysctl_tcp_mem,
 571                 .maxlen         = sizeof(sysctl_tcp_mem),
 572                 .mode           = 0644,
 573                 .proc_handler   = &proc_dointvec
 574         },
 575         {
 576                 .ctl_name       = NET_TCP_WMEM,
 577                 .procname       = "tcp_wmem",
 578                 .data           = &sysctl_tcp_wmem,
 579                 .maxlen         = sizeof(sysctl_tcp_wmem),
 580                 .mode           = 0644,
 581                 .proc_handler   = &proc_dointvec
 582         },
 583         {
 584                 .ctl_name       = NET_TCP_RMEM,
 585                 .procname       = "tcp_rmem",
 586                 .data           = &sysctl_tcp_rmem,
 587                 .maxlen         = sizeof(sysctl_tcp_rmem),
 588                 .mode           = 0644,
 589                 .proc_handler   = &proc_dointvec
 590         },
 591         {
 592                 .ctl_name       = NET_TCP_APP_WIN,
 593                 .procname       = "tcp_app_win",
 594                 .data           = &sysctl_tcp_app_win,
 595                 .maxlen         = sizeof(int),
 596                 .mode           = 0644,
 597                 .proc_handler   = &proc_dointvec
 598         },
 599         {
 600                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 601                 .procname       = "tcp_adv_win_scale",
 602                 .data           = &sysctl_tcp_adv_win_scale,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = &proc_dointvec
 606         },
 607         {
 608                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 609                 .procname       = "icmp_ratelimit",
 610                 .data           = &sysctl_icmp_ratelimit,
 611                 .maxlen         = sizeof(int),
 612                 .mode           = 0644,
 613                 .proc_handler   = &proc_dointvec
 614         },
 615         {
 616                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 617                 .procname       = "icmp_ratemask",
 618                 .data           = &sysctl_icmp_ratemask,
 619                 .maxlen         = sizeof(int),
 620                 .mode           = 0644,
 621                 .proc_handler   = &proc_dointvec
 622         },
 623         {
 624                 .ctl_name       = NET_TCP_TW_REUSE,
 625                 .procname       = "tcp_tw_reuse",
 626                 .data           = &sysctl_tcp_tw_reuse,
 627                 .maxlen         = sizeof(int),
 628                 .mode           = 0644,
 629                 .proc_handler   = &proc_dointvec
 630         },
 631         {
 632                 .ctl_name       = NET_TCP_FRTO,
 633                 .procname       = "tcp_frto",
 634                 .data           = &sysctl_tcp_frto,
 635                 .maxlen         = sizeof(int),
 636                 .mode           = 0644,
 637                 .proc_handler   = &proc_dointvec
 638         },
 639         {
 640                 .ctl_name       = NET_TCP_LOW_LATENCY,
 641                 .procname       = "tcp_low_latency",
 642                 .data           = &sysctl_tcp_low_latency,
 643                 .maxlen         = sizeof(int),
 644                 .mode           = 0644,
 645                 .proc_handler   = &proc_dointvec
 646         },
 647         {
 648                 .ctl_name       = NET_IPV4_IPFRAG_SECRET_INTERVAL,
 649                 .procname       = "ipfrag_secret_interval",
 650                 .data           = &sysctl_ipfrag_secret_interval,
 651                 .maxlen         = sizeof(int),
 652                 .mode           = 0644,
 653                 .proc_handler   = &proc_dointvec_jiffies,
 654                 .strategy       = &sysctl_jiffies
 655         },
 656         {
 657                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 658                 .procname       = "tcp_no_metrics_save",
 659                 .data           = &sysctl_tcp_nometrics_save,
 660                 .maxlen         = sizeof(int),
 661                 .mode           = 0644,
 662                 .proc_handler   = &proc_dointvec,
 663         },
 664         {
 665                 .ctl_name       = NET_TCP_WESTWOOD,
 666                 .procname       = "tcp_westwood",
 667                 .data           = &sysctl_tcp_westwood,
 668                 .maxlen         = sizeof(int),
 669                 .mode           = 0644,
 670                 .proc_handler   = &proc_dointvec,
 671         },
 672         {
 673                 .ctl_name       = NET_TCP_VEGAS,
 674                 .procname       = "tcp_vegas_cong_avoid",
 675                 .data           = &sysctl_tcp_vegas_cong_avoid,
 676                 .maxlen         = sizeof(int),
 677                 .mode           = 0644,
 678                 .proc_handler   = &proc_dointvec,
 679         },
 680         {
 681                 .ctl_name       = NET_TCP_VEGAS_ALPHA,
 682                 .procname       = "tcp_vegas_alpha",
 683                 .data           = &sysctl_tcp_vegas_alpha,
 684                 .maxlen         = sizeof(int),
 685                 .mode           = 0644,
 686                 .proc_handler   = &proc_dointvec,
 687         },
 688         {
 689                 .ctl_name       = NET_TCP_VEGAS_BETA,
 690                 .procname       = "tcp_vegas_beta",
 691                 .data           = &sysctl_tcp_vegas_beta,
 692                 .maxlen         = sizeof(int),
 693                 .mode           = 0644,
 694                 .proc_handler   = &proc_dointvec,
 695         },
 696         {
 697                 .ctl_name       = NET_TCP_VEGAS_GAMMA,
 698                 .procname       = "tcp_vegas_gamma",
 699                 .data           = &sysctl_tcp_vegas_gamma,
 700                 .maxlen         = sizeof(int),
 701                 .mode           = 0644,
 702                 .proc_handler   = &proc_dointvec,
 703         },
 704         {
 705                 .ctl_name       = NET_TCP_BIC,
 706                 .procname       = "tcp_bic",
 707                 .data           = &sysctl_tcp_bic,
 708                 .maxlen         = sizeof(int),
 709                 .mode           = 0644,
 710                 .proc_handler   = &proc_dointvec,
 711         },
 712         {
 713                 .ctl_name       = NET_TCP_BIC_FAST_CONVERGENCE,
 714                 .procname       = "tcp_bic_fast_convergence",
 715                 .data           = &sysctl_tcp_bic_fast_convergence,
 716                 .maxlen         = sizeof(int),
 717                 .mode           = 0644,
 718                 .proc_handler   = &proc_dointvec,
 719         },
 720         {
 721                 .ctl_name       = NET_TCP_BIC_LOW_WINDOW,
 722                 .procname       = "tcp_bic_low_window",
 723                 .data           = &sysctl_tcp_bic_low_window,
 724                 .maxlen         = sizeof(int),
 725                 .mode           = 0644,
 726                 .proc_handler   = &proc_dointvec,
 727         },
 728         {
 729                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 730                 .procname       = "tcp_moderate_rcvbuf",
 731                 .data           = &sysctl_tcp_moderate_rcvbuf,
 732                 .maxlen         = sizeof(int),
 733                 .mode           = 0644,
 734                 .proc_handler   = &proc_dointvec,
 735         },
 736         {
 737                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 738                 .procname       = "tcp_tso_win_divisor",
 739                 .data           = &sysctl_tcp_tso_win_divisor,
 740                 .maxlen         = sizeof(int),
 741                 .mode           = 0644,
 742                 .proc_handler   = &proc_dointvec,
 743         },
 744         {
 745                 .ctl_name       = NET_TCP_BIC_BETA,
 746                 .procname       = "tcp_bic_beta",
 747                 .data           = &sysctl_tcp_bic_beta,
 748                 .maxlen         = sizeof(int),
 749                 .mode           = 0644,
 750                 .proc_handler   = &proc_dointvec,
 751         },
 752         { .ctl_name = 0 }
 753 };
 754
 755 #endif /* CONFIG_SYSCTL */
 756
 757 EXPORT_SYMBOL(ipv4_config);