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