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   1 /*
   2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   3  *
   4  * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
   5  *
   6  * Begun April 1, 1996, Mike Shaver.
   7  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/module.h>
  12 #include <linux/sysctl.h>
  13 #include <linux/igmp.h>
  14 #include <linux/inetdevice.h>
  15 #include <net/snmp.h>
  16 #include <net/icmp.h>
  17 #include <net/ip.h>
  18 #include <net/route.h>
  19 #include <net/tcp.h>
  20 #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                          void **context)
  56 {
  57         int *valp = table->data;
  58         int new;
  59
  60         if (!newval || !newlen)
  61                 return 0;
  62
  63         if (newlen != sizeof(int))
  64                 return -EINVAL;
  65
  66         if (get_user(new, (int __user *)newval))
  67                 return -EFAULT;
  68
  69         if (new == *valp)
  70                 return 0;
  71
  72         if (oldval && oldlenp) {
  73                 size_t len;
  74
  75                 if (get_user(len, oldlenp))
  76                         return -EFAULT;
  77
  78                 if (len) {
  79                         if (len > table->maxlen)
  80                                 len = table->maxlen;
  81                         if (copy_to_user(oldval, valp, len))
  82                                 return -EFAULT;
  83                         if (put_user(len, oldlenp))
  84                                 return -EFAULT;
  85                 }
  86         }
  87
  88         *valp = new;
  89         inet_forward_change();
  90         return 1;
  91 }
  92
  93 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
  94                                        void __user *buffer, size_t *lenp, loff_t *ppos)
  95 {
  96         char val[TCP_CA_NAME_MAX];
  97         ctl_table tbl = {
  98                 .data = val,
  99                 .maxlen = TCP_CA_NAME_MAX,
 100         };
 101         int ret;
 102
 103         tcp_get_default_congestion_control(val);
 104
 105         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 106         if (write && ret == 0)
 107                 ret = tcp_set_default_congestion_control(val);
 108         return ret;
 109 }
 110
 111 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
 112                                          int nlen, void __user *oldval,
 113                                          size_t __user *oldlenp,
 114                                          void __user *newval, size_t newlen,
 115                                          void **context)
 116 {
 117         char val[TCP_CA_NAME_MAX];
 118         ctl_table tbl = {
 119                 .data = val,
 120                 .maxlen = TCP_CA_NAME_MAX,
 121         };
 122         int ret;
 123
 124         tcp_get_default_congestion_control(val);
 125         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
 126                             context);
 127         if (ret == 0 && newval && newlen)
 128                 ret = tcp_set_default_congestion_control(val);
 129         return ret;
 130 }
 131
 132 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 133                                                  int write, struct file * filp,
 134                                                  void __user *buffer, size_t *lenp,
 135                                                  loff_t *ppos)
 136 {
 137         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 138         int ret;
 139
 140         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 141         if (!tbl.data)
 142                 return -ENOMEM;
 143         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 144         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 145         kfree(tbl.data);
 146         return ret;
 147 }
 148
 149 static int proc_allowed_congestion_control(ctl_table *ctl,
 150                                            int write, struct file * filp,
 151                                            void __user *buffer, size_t *lenp,
 152                                            loff_t *ppos)
 153 {
 154         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 155         int ret;
 156
 157         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 158         if (!tbl.data)
 159                 return -ENOMEM;
 160
 161         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 162         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 163         if (write && ret == 0)
 164                 ret = tcp_set_allowed_congestion_control(tbl.data);
 165         kfree(tbl.data);
 166         return ret;
 167 }
 168
 169 static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
 170                                                int nlen, void __user *oldval,
 171                                                size_t __user *oldlenp,
 172                                                void __user *newval, size_t newlen,
 173                                                void **context)
 174 {
 175         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 176         int ret;
 177
 178         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 179         if (!tbl.data)
 180                 return -ENOMEM;
 181
 182         tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
 183         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen,
 184                             context);
 185         if (ret == 0 && newval && newlen)
 186                 ret = tcp_set_allowed_congestion_control(tbl.data);
 187         kfree(tbl.data);
 188
 189         return ret;
 190
 191 }
 192
 193 ctl_table ipv4_table[] = {
 194         {
 195                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 196                 .procname       = "tcp_timestamps",
 197                 .data           = &sysctl_tcp_timestamps,
 198                 .maxlen         = sizeof(int),
 199                 .mode           = 0644,
 200                 .proc_handler   = &proc_dointvec
 201         },
 202         {
 203                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 204                 .procname       = "tcp_window_scaling",
 205                 .data           = &sysctl_tcp_window_scaling,
 206                 .maxlen         = sizeof(int),
 207                 .mode           = 0644,
 208                 .proc_handler   = &proc_dointvec
 209         },
 210         {
 211                 .ctl_name       = NET_IPV4_TCP_SACK,
 212                 .procname       = "tcp_sack",
 213                 .data           = &sysctl_tcp_sack,
 214                 .maxlen         = sizeof(int),
 215                 .mode           = 0644,
 216                 .proc_handler   = &proc_dointvec
 217         },
 218         {
 219                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 220                 .procname       = "tcp_retrans_collapse",
 221                 .data           = &sysctl_tcp_retrans_collapse,
 222                 .maxlen         = sizeof(int),
 223                 .mode           = 0644,
 224                 .proc_handler   = &proc_dointvec
 225         },
 226         {
 227                 .ctl_name       = NET_IPV4_FORWARD,
 228                 .procname       = "ip_forward",
 229                 .data           = &ipv4_devconf.forwarding,
 230                 .maxlen         = sizeof(int),
 231                 .mode           = 0644,
 232                 .proc_handler   = &ipv4_sysctl_forward,
 233                 .strategy       = &ipv4_sysctl_forward_strategy
 234         },
 235         {
 236                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 237                 .procname       = "ip_default_ttl",
 238                 .data           = &sysctl_ip_default_ttl,
 239                 .maxlen         = sizeof(int),
 240                 .mode           = 0644,
 241                 .proc_handler   = &ipv4_doint_and_flush,
 242                 .strategy       = &ipv4_doint_and_flush_strategy,
 243         },
 244         {
 245                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 246                 .procname       = "ip_no_pmtu_disc",
 247                 .data           = &ipv4_config.no_pmtu_disc,
 248                 .maxlen         = sizeof(int),
 249                 .mode           = 0644,
 250                 .proc_handler   = &proc_dointvec
 251         },
 252         {
 253                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 254                 .procname       = "ip_nonlocal_bind",
 255                 .data           = &sysctl_ip_nonlocal_bind,
 256                 .maxlen         = sizeof(int),
 257                 .mode           = 0644,
 258                 .proc_handler   = &proc_dointvec
 259         },
 260         {
 261                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 262                 .procname       = "tcp_syn_retries",
 263                 .data           = &sysctl_tcp_syn_retries,
 264                 .maxlen         = sizeof(int),
 265                 .mode           = 0644,
 266                 .proc_handler   = &proc_dointvec
 267         },
 268         {
 269                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 270                 .procname       = "tcp_synack_retries",
 271                 .data           = &sysctl_tcp_synack_retries,
 272                 .maxlen         = sizeof(int),
 273                 .mode           = 0644,
 274                 .proc_handler   = &proc_dointvec
 275         },
 276         {
 277                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 278                 .procname       = "tcp_max_orphans",
 279                 .data           = &sysctl_tcp_max_orphans,
 280                 .maxlen         = sizeof(int),
 281                 .mode           = 0644,
 282                 .proc_handler   = &proc_dointvec
 283         },
 284         {
 285                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 286                 .procname       = "tcp_max_tw_buckets",
 287                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 288                 .maxlen         = sizeof(int),
 289                 .mode           = 0644,
 290                 .proc_handler   = &proc_dointvec
 291         },
 292         {
 293                 .ctl_name       = NET_IPV4_IPFRAG_HIGH_THRESH,
 294                 .procname       = "ipfrag_high_thresh",
 295                 .data           = &sysctl_ipfrag_high_thresh,
 296                 .maxlen         = sizeof(int),
 297                 .mode           = 0644,
 298                 .proc_handler   = &proc_dointvec
 299         },
 300         {
 301                 .ctl_name       = NET_IPV4_IPFRAG_LOW_THRESH,
 302                 .procname       = "ipfrag_low_thresh",
 303                 .data           = &sysctl_ipfrag_low_thresh,
 304                 .maxlen         = sizeof(int),
 305                 .mode           = 0644,
 306                 .proc_handler   = &proc_dointvec
 307         },
 308         {
 309                 .ctl_name       = NET_IPV4_DYNADDR,
 310                 .procname       = "ip_dynaddr",
 311                 .data           = &sysctl_ip_dynaddr,
 312                 .maxlen         = sizeof(int),
 313                 .mode           = 0644,
 314                 .proc_handler   = &proc_dointvec
 315         },
 316         {
 317                 .ctl_name       = NET_IPV4_IPFRAG_TIME,
 318                 .procname       = "ipfrag_time",
 319                 .data           = &sysctl_ipfrag_time,
 320                 .maxlen         = sizeof(int),
 321                 .mode           = 0644,
 322                 .proc_handler   = &proc_dointvec_jiffies,
 323                 .strategy       = &sysctl_jiffies
 324         },
 325         {
 326                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 327                 .procname       = "tcp_keepalive_time",
 328                 .data           = &sysctl_tcp_keepalive_time,
 329                 .maxlen         = sizeof(int),
 330                 .mode           = 0644,
 331                 .proc_handler   = &proc_dointvec_jiffies,
 332                 .strategy       = &sysctl_jiffies
 333         },
 334         {
 335                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 336                 .procname       = "tcp_keepalive_probes",
 337                 .data           = &sysctl_tcp_keepalive_probes,
 338                 .maxlen         = sizeof(int),
 339                 .mode           = 0644,
 340                 .proc_handler   = &proc_dointvec
 341         },
 342         {
 343                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 344                 .procname       = "tcp_keepalive_intvl",
 345                 .data           = &sysctl_tcp_keepalive_intvl,
 346                 .maxlen         = sizeof(int),
 347                 .mode           = 0644,
 348                 .proc_handler   = &proc_dointvec_jiffies,
 349                 .strategy       = &sysctl_jiffies
 350         },
 351         {
 352                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 353                 .procname       = "tcp_retries1",
 354                 .data           = &sysctl_tcp_retries1,
 355                 .maxlen         = sizeof(int),
 356                 .mode           = 0644,
 357                 .proc_handler   = &proc_dointvec_minmax,
 358                 .strategy       = &sysctl_intvec,
 359                 .extra2         = &tcp_retr1_max
 360         },
 361         {
 362                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 363                 .procname       = "tcp_retries2",
 364                 .data           = &sysctl_tcp_retries2,
 365                 .maxlen         = sizeof(int),
 366                 .mode           = 0644,
 367                 .proc_handler   = &proc_dointvec
 368         },
 369         {
 370                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 371                 .procname       = "tcp_fin_timeout",
 372                 .data           = &sysctl_tcp_fin_timeout,
 373                 .maxlen         = sizeof(int),
 374                 .mode           = 0644,
 375                 .proc_handler   = &proc_dointvec_jiffies,
 376                 .strategy       = &sysctl_jiffies
 377         },
 378 #ifdef CONFIG_SYN_COOKIES
 379         {
 380                 .ctl_name       = NET_TCP_SYNCOOKIES,
 381                 .procname       = "tcp_syncookies",
 382                 .data           = &sysctl_tcp_syncookies,
 383                 .maxlen         = sizeof(int),
 384                 .mode           = 0644,
 385                 .proc_handler   = &proc_dointvec
 386         },
 387 #endif
 388         {
 389                 .ctl_name       = NET_TCP_TW_RECYCLE,
 390                 .procname       = "tcp_tw_recycle",
 391                 .data           = &tcp_death_row.sysctl_tw_recycle,
 392                 .maxlen         = sizeof(int),
 393                 .mode           = 0644,
 394                 .proc_handler   = &proc_dointvec
 395         },
 396         {
 397                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 398                 .procname       = "tcp_abort_on_overflow",
 399                 .data           = &sysctl_tcp_abort_on_overflow,
 400                 .maxlen         = sizeof(int),
 401                 .mode           = 0644,
 402                 .proc_handler   = &proc_dointvec
 403         },
 404         {
 405                 .ctl_name       = NET_TCP_STDURG,
 406                 .procname       = "tcp_stdurg",
 407                 .data           = &sysctl_tcp_stdurg,
 408                 .maxlen         = sizeof(int),
 409                 .mode           = 0644,
 410                 .proc_handler   = &proc_dointvec
 411         },
 412         {
 413                 .ctl_name       = NET_TCP_RFC1337,
 414                 .procname       = "tcp_rfc1337",
 415                 .data           = &sysctl_tcp_rfc1337,
 416                 .maxlen         = sizeof(int),
 417                 .mode           = 0644,
 418                 .proc_handler   = &proc_dointvec
 419         },
 420         {
 421                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 422                 .procname       = "tcp_max_syn_backlog",
 423                 .data           = &sysctl_max_syn_backlog,
 424                 .maxlen         = sizeof(int),
 425                 .mode           = 0644,
 426                 .proc_handler   = &proc_dointvec
 427         },
 428         {
 429                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 430                 .procname       = "ip_local_port_range",
 431                 .data           = &sysctl_local_port_range,
 432                 .maxlen         = sizeof(sysctl_local_port_range),
 433                 .mode           = 0644,
 434                 .proc_handler   = &proc_dointvec_minmax,
 435                 .strategy       = &sysctl_intvec,
 436                 .extra1         = ip_local_port_range_min,
 437                 .extra2         = ip_local_port_range_max
 438         },
 439         {
 440                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 441                 .procname       = "icmp_echo_ignore_all",
 442                 .data           = &sysctl_icmp_echo_ignore_all,
 443                 .maxlen         = sizeof(int),
 444                 .mode           = 0644,
 445                 .proc_handler   = &proc_dointvec
 446         },
 447         {
 448                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 449                 .procname       = "icmp_echo_ignore_broadcasts",
 450                 .data           = &sysctl_icmp_echo_ignore_broadcasts,
 451                 .maxlen         = sizeof(int),
 452                 .mode           = 0644,
 453                 .proc_handler   = &proc_dointvec
 454         },
 455         {
 456                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 457                 .procname       = "icmp_ignore_bogus_error_responses",
 458                 .data           = &sysctl_icmp_ignore_bogus_error_responses,
 459                 .maxlen         = sizeof(int),
 460                 .mode           = 0644,
 461                 .proc_handler   = &proc_dointvec
 462         },
 463         {
 464                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 465                 .procname       = "icmp_errors_use_inbound_ifaddr",
 466                 .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
 467                 .maxlen         = sizeof(int),
 468                 .mode           = 0644,
 469                 .proc_handler   = &proc_dointvec
 470         },
 471         {
 472                 .ctl_name       = NET_IPV4_ROUTE,
 473                 .procname       = "route",
 474                 .maxlen         = 0,
 475                 .mode           = 0555,
 476                 .child          = ipv4_route_table
 477         },
 478 #ifdef CONFIG_IP_MULTICAST
 479         {
 480                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 481                 .procname       = "igmp_max_memberships",
 482                 .data           = &sysctl_igmp_max_memberships,
 483                 .maxlen         = sizeof(int),
 484                 .mode           = 0644,
 485                 .proc_handler   = &proc_dointvec
 486         },
 487
 488 #endif
 489         {
 490                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 491                 .procname       = "igmp_max_msf",
 492                 .data           = &sysctl_igmp_max_msf,
 493                 .maxlen         = sizeof(int),
 494                 .mode           = 0644,
 495                 .proc_handler   = &proc_dointvec
 496         },
 497         {
 498                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 499                 .procname       = "inet_peer_threshold",
 500                 .data           = &inet_peer_threshold,
 501                 .maxlen         = sizeof(int),
 502                 .mode           = 0644,
 503                 .proc_handler   = &proc_dointvec
 504         },
 505         {
 506                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 507                 .procname       = "inet_peer_minttl",
 508                 .data           = &inet_peer_minttl,
 509                 .maxlen         = sizeof(int),
 510                 .mode           = 0644,
 511                 .proc_handler   = &proc_dointvec_jiffies,
 512                 .strategy       = &sysctl_jiffies
 513         },
 514         {
 515                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 516                 .procname       = "inet_peer_maxttl",
 517                 .data           = &inet_peer_maxttl,
 518                 .maxlen         = sizeof(int),
 519                 .mode           = 0644,
 520                 .proc_handler   = &proc_dointvec_jiffies,
 521                 .strategy       = &sysctl_jiffies
 522         },
 523         {
 524                 .ctl_name       = NET_IPV4_INET_PEER_GC_MINTIME,
 525                 .procname       = "inet_peer_gc_mintime",
 526                 .data           = &inet_peer_gc_mintime,
 527                 .maxlen         = sizeof(int),
 528                 .mode           = 0644,
 529                 .proc_handler   = &proc_dointvec_jiffies,
 530                 .strategy       = &sysctl_jiffies
 531         },
 532         {
 533                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 534                 .procname       = "inet_peer_gc_maxtime",
 535                 .data           = &inet_peer_gc_maxtime,
 536                 .maxlen         = sizeof(int),
 537                 .mode           = 0644,
 538                 .proc_handler   = &proc_dointvec_jiffies,
 539                 .strategy       = &sysctl_jiffies
 540         },
 541         {
 542                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 543                 .procname       = "tcp_orphan_retries",
 544                 .data           = &sysctl_tcp_orphan_retries,
 545                 .maxlen         = sizeof(int),
 546                 .mode           = 0644,
 547                 .proc_handler   = &proc_dointvec
 548         },
 549         {
 550                 .ctl_name       = NET_TCP_FACK,
 551                 .procname       = "tcp_fack",
 552                 .data           = &sysctl_tcp_fack,
 553                 .maxlen         = sizeof(int),
 554                 .mode           = 0644,
 555                 .proc_handler   = &proc_dointvec
 556         },
 557         {
 558                 .ctl_name       = NET_TCP_REORDERING,
 559                 .procname       = "tcp_reordering",
 560                 .data           = &sysctl_tcp_reordering,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = &proc_dointvec
 564         },
 565         {
 566                 .ctl_name       = NET_TCP_ECN,
 567                 .procname       = "tcp_ecn",
 568                 .data           = &sysctl_tcp_ecn,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = &proc_dointvec
 572         },
 573         {
 574                 .ctl_name       = NET_TCP_DSACK,
 575                 .procname       = "tcp_dsack",
 576                 .data           = &sysctl_tcp_dsack,
 577                 .maxlen         = sizeof(int),
 578                 .mode           = 0644,
 579                 .proc_handler   = &proc_dointvec
 580         },
 581         {
 582                 .ctl_name       = NET_TCP_MEM,
 583                 .procname       = "tcp_mem",
 584                 .data           = &sysctl_tcp_mem,
 585                 .maxlen         = sizeof(sysctl_tcp_mem),
 586                 .mode           = 0644,
 587                 .proc_handler   = &proc_dointvec
 588         },
 589         {
 590                 .ctl_name       = NET_TCP_WMEM,
 591                 .procname       = "tcp_wmem",
 592                 .data           = &sysctl_tcp_wmem,
 593                 .maxlen         = sizeof(sysctl_tcp_wmem),
 594                 .mode           = 0644,
 595                 .proc_handler   = &proc_dointvec
 596         },
 597         {
 598                 .ctl_name       = NET_TCP_RMEM,
 599                 .procname       = "tcp_rmem",
 600                 .data           = &sysctl_tcp_rmem,
 601                 .maxlen         = sizeof(sysctl_tcp_rmem),
 602                 .mode           = 0644,
 603                 .proc_handler   = &proc_dointvec
 604         },
 605         {
 606                 .ctl_name       = NET_TCP_APP_WIN,
 607                 .procname       = "tcp_app_win",
 608                 .data           = &sysctl_tcp_app_win,
 609                 .maxlen         = sizeof(int),
 610                 .mode           = 0644,
 611                 .proc_handler   = &proc_dointvec
 612         },
 613         {
 614                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 615                 .procname       = "tcp_adv_win_scale",
 616                 .data           = &sysctl_tcp_adv_win_scale,
 617                 .maxlen         = sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec
 620         },
 621         {
 622                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 623                 .procname       = "icmp_ratelimit",
 624                 .data           = &sysctl_icmp_ratelimit,
 625                 .maxlen         = sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = &proc_dointvec
 628         },
 629         {
 630                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 631                 .procname       = "icmp_ratemask",
 632                 .data           = &sysctl_icmp_ratemask,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = &proc_dointvec
 636         },
 637         {
 638                 .ctl_name       = NET_TCP_TW_REUSE,
 639                 .procname       = "tcp_tw_reuse",
 640                 .data           = &sysctl_tcp_tw_reuse,
 641                 .maxlen         = sizeof(int),
 642                 .mode           = 0644,
 643                 .proc_handler   = &proc_dointvec
 644         },
 645         {
 646                 .ctl_name       = NET_TCP_FRTO,
 647                 .procname       = "tcp_frto",
 648                 .data           = &sysctl_tcp_frto,
 649                 .maxlen         = sizeof(int),
 650                 .mode           = 0644,
 651                 .proc_handler   = &proc_dointvec
 652         },
 653         {
 654                 .ctl_name       = NET_TCP_LOW_LATENCY,
 655                 .procname       = "tcp_low_latency",
 656                 .data           = &sysctl_tcp_low_latency,
 657                 .maxlen         = sizeof(int),
 658                 .mode           = 0644,
 659                 .proc_handler   = &proc_dointvec
 660         },
 661         {
 662                 .ctl_name       = NET_IPV4_IPFRAG_SECRET_INTERVAL,
 663                 .procname       = "ipfrag_secret_interval",
 664                 .data           = &sysctl_ipfrag_secret_interval,
 665                 .maxlen         = sizeof(int),
 666                 .mode           = 0644,
 667                 .proc_handler   = &proc_dointvec_jiffies,
 668                 .strategy       = &sysctl_jiffies
 669         },
 670         {
 671                 .ctl_name       = NET_IPV4_IPFRAG_MAX_DIST,
 672                 .procname       = "ipfrag_max_dist",
 673                 .data           = &sysctl_ipfrag_max_dist,
 674                 .maxlen         = sizeof(int),
 675                 .mode           = 0644,
 676                 .proc_handler   = &proc_dointvec_minmax,
 677                 .extra1         = &zero
 678         },
 679         {
 680                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 681                 .procname       = "tcp_no_metrics_save",
 682                 .data           = &sysctl_tcp_nometrics_save,
 683                 .maxlen         = sizeof(int),
 684                 .mode           = 0644,
 685                 .proc_handler   = &proc_dointvec,
 686         },
 687         {
 688                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 689                 .procname       = "tcp_moderate_rcvbuf",
 690                 .data           = &sysctl_tcp_moderate_rcvbuf,
 691                 .maxlen         = sizeof(int),
 692                 .mode           = 0644,
 693                 .proc_handler   = &proc_dointvec,
 694         },
 695         {
 696                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 697                 .procname       = "tcp_tso_win_divisor",
 698                 .data           = &sysctl_tcp_tso_win_divisor,
 699                 .maxlen         = sizeof(int),
 700                 .mode           = 0644,
 701                 .proc_handler   = &proc_dointvec,
 702         },
 703         {
 704                 .ctl_name       = NET_TCP_CONG_CONTROL,
 705                 .procname       = "tcp_congestion_control",
 706                 .mode           = 0644,
 707                 .maxlen         = TCP_CA_NAME_MAX,
 708                 .proc_handler   = &proc_tcp_congestion_control,
 709                 .strategy       = &sysctl_tcp_congestion_control,
 710         },
 711         {
 712                 .ctl_name       = NET_TCP_ABC,
 713                 .procname       = "tcp_abc",
 714                 .data           = &sysctl_tcp_abc,
 715                 .maxlen         = sizeof(int),
 716                 .mode           = 0644,
 717                 .proc_handler   = &proc_dointvec,
 718         },
 719         {
 720                 .ctl_name       = NET_TCP_MTU_PROBING,
 721                 .procname       = "tcp_mtu_probing",
 722                 .data           = &sysctl_tcp_mtu_probing,
 723                 .maxlen         = sizeof(int),
 724                 .mode           = 0644,
 725                 .proc_handler   = &proc_dointvec,
 726         },
 727         {
 728                 .ctl_name       = NET_TCP_BASE_MSS,
 729                 .procname       = "tcp_base_mss",
 730                 .data           = &sysctl_tcp_base_mss,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0644,
 733                 .proc_handler   = &proc_dointvec,
 734         },
 735         {
 736                 .ctl_name       = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
 737                 .procname       = "tcp_workaround_signed_windows",
 738                 .data           = &sysctl_tcp_workaround_signed_windows,
 739                 .maxlen         = sizeof(int),
 740                 .mode           = 0644,
 741                 .proc_handler   = &proc_dointvec
 742         },
 743 #ifdef CONFIG_NET_DMA
 744         {
 745                 .ctl_name       = NET_TCP_DMA_COPYBREAK,
 746                 .procname       = "tcp_dma_copybreak",
 747                 .data           = &sysctl_tcp_dma_copybreak,
 748                 .maxlen         = sizeof(int),
 749                 .mode           = 0644,
 750                 .proc_handler   = &proc_dointvec
 751         },
 752 #endif
 753         {
 754                 .ctl_name       = NET_TCP_SLOW_START_AFTER_IDLE,
 755                 .procname       = "tcp_slow_start_after_idle",
 756                 .data           = &sysctl_tcp_slow_start_after_idle,
 757                 .maxlen         = sizeof(int),
 758                 .mode           = 0644,
 759                 .proc_handler   = &proc_dointvec
 760         },
 761 #ifdef CONFIG_NETLABEL
 762         {
 763                 .ctl_name       = NET_CIPSOV4_CACHE_ENABLE,
 764                 .procname       = "cipso_cache_enable",
 765                 .data           = &cipso_v4_cache_enabled,
 766                 .maxlen         = sizeof(int),
 767                 .mode           = 0644,
 768                 .proc_handler   = &proc_dointvec,
 769         },
 770         {
 771                 .ctl_name       = NET_CIPSOV4_CACHE_BUCKET_SIZE,
 772                 .procname       = "cipso_cache_bucket_size",
 773                 .data           = &cipso_v4_cache_bucketsize,
 774                 .maxlen         = sizeof(int),
 775                 .mode           = 0644,
 776                 .proc_handler   = &proc_dointvec,
 777         },
 778         {
 779                 .ctl_name       = NET_CIPSOV4_RBM_OPTFMT,
 780                 .procname       = "cipso_rbm_optfmt",
 781                 .data           = &cipso_v4_rbm_optfmt,
 782                 .maxlen         = sizeof(int),
 783                 .mode           = 0644,
 784                 .proc_handler   = &proc_dointvec,
 785         },
 786         {
 787                 .ctl_name       = NET_CIPSOV4_RBM_STRICTVALID,
 788                 .procname       = "cipso_rbm_strictvalid",
 789                 .data           = &cipso_v4_rbm_strictvalid,
 790                 .maxlen         = sizeof(int),
 791                 .mode           = 0644,
 792                 .proc_handler   = &proc_dointvec,
 793         },
 794 #endif /* CONFIG_NETLABEL */
 795         {
 796                 .ctl_name       = NET_TCP_AVAIL_CONG_CONTROL,
 797                 .procname       = "tcp_available_congestion_control",
 798                 .maxlen         = TCP_CA_BUF_MAX,
 799                 .mode           = 0444,
 800                 .proc_handler   = &proc_tcp_available_congestion_control,
 801         },
 802         {
 803                 .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
 804                 .procname       = "tcp_allowed_congestion_control",
 805                 .maxlen         = TCP_CA_BUF_MAX,
 806                 .mode           = 0644,
 807                 .proc_handler   = &proc_allowed_congestion_control,
 808                 .strategy       = &strategy_allowed_congestion_control,
 809         },
 810         { .ctl_name = 0 }
 811 };
 812
 813 #endif /* CONFIG_SYSCTL */
 814
 815 EXPORT_SYMBOL(ipv4_config);