net/ipv4/sysctl_net_ipv4.c

   1 /*
   2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   3  *
   4  * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
   5  *
   6  * Begun April 1, 1996, Mike Shaver.
   7  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/module.h>
  12 #include <linux/sysctl.h>
  13 #include <linux/igmp.h>
  14 #include <linux/inetdevice.h>
  15 #include <linux/seqlock.h>
  16 #include <net/snmp.h>
  17 #include <net/icmp.h>
  18 #include <net/ip.h>
  19 #include <net/route.h>
  20 #include <net/tcp.h>
  21 #include <net/cipso_ipv4.h>
  22
  23 /* From af_inet.c */
  24 extern int sysctl_ip_nonlocal_bind;
  25
  26 #ifdef CONFIG_SYSCTL
  27 static int zero;
  28 static int tcp_retr1_max = 255;
  29 static int ip_local_port_range_min[] = { 1, 1 };
  30 static int ip_local_port_range_max[] = { 65535, 65535 };
  31 #endif
  32
  33 struct ipv4_config ipv4_config;
  34
  35 #ifdef CONFIG_SYSCTL
  36
  37 static
  38 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
  39                         void __user *buffer, size_t *lenp, loff_t *ppos)
  40 {
  41         int val = IPV4_DEVCONF_ALL(FORWARDING);
  42         int ret;
  43
  44         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
  45
  46         if (write && IPV4_DEVCONF_ALL(FORWARDING) != val)
  47                 inet_forward_change();
  48
  49         return ret;
  50 }
  51
  52 static int ipv4_sysctl_forward_strategy(ctl_table *table,
  53                          int __user *name, int nlen,
  54                          void __user *oldval, size_t __user *oldlenp,
  55                          void __user *newval, size_t newlen)
  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 extern seqlock_t sysctl_port_range_lock;
  94 extern int sysctl_local_port_range[2];
  95
  96 /* Update system visible IP port range */
  97 static void set_local_port_range(int range[2])
  98 {
  99         write_seqlock(&sysctl_port_range_lock);
 100         sysctl_local_port_range[0] = range[0];
 101         sysctl_local_port_range[1] = range[1];
 102         write_sequnlock(&sysctl_port_range_lock);
 103 }
 104
 105 /* Validate changes from /proc interface. */
 106 static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
 107                                  void __user *buffer,
 108                                  size_t *lenp, loff_t *ppos)
 109 {
 110         int ret;
 111         int range[2] = { sysctl_local_port_range[0],
 112                          sysctl_local_port_range[1] };
 113         ctl_table tmp = {
 114                 .data = &range,
 115                 .maxlen = sizeof(range),
 116                 .mode = table->mode,
 117                 .extra1 = &ip_local_port_range_min,
 118                 .extra2 = &ip_local_port_range_max,
 119         };
 120
 121         ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
 122
 123         if (write && ret == 0) {
 124                 if (range[1] <= range[0])
 125                         ret = -EINVAL;
 126                 else
 127                         set_local_port_range(range);
 128         }
 129
 130         return ret;
 131 }
 132
 133 /* Validate changes from sysctl interface. */
 134 static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
 135                                          int nlen, void __user *oldval,
 136                                          size_t __user *oldlenp,
 137                                         void __user *newval, size_t newlen)
 138 {
 139         int ret;
 140         int range[2] = { sysctl_local_port_range[0],
 141                          sysctl_local_port_range[1] };
 142         ctl_table tmp = {
 143                 .data = &range,
 144                 .maxlen = sizeof(range),
 145                 .mode = table->mode,
 146                 .extra1 = &ip_local_port_range_min,
 147                 .extra2 = &ip_local_port_range_max,
 148         };
 149
 150         ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
 151         if (ret == 0 && newval && newlen) {
 152                 if (range[1] <= range[0])
 153                         ret = -EINVAL;
 154                 else
 155                         set_local_port_range(range);
 156         }
 157         return ret;
 158 }
 159
 160
 161 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
 162                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 163 {
 164         char val[TCP_CA_NAME_MAX];
 165         ctl_table tbl = {
 166                 .data = val,
 167                 .maxlen = TCP_CA_NAME_MAX,
 168         };
 169         int ret;
 170
 171         tcp_get_default_congestion_control(val);
 172
 173         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 174         if (write && ret == 0)
 175                 ret = tcp_set_default_congestion_control(val);
 176         return ret;
 177 }
 178
 179 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
 180                                          int nlen, void __user *oldval,
 181                                          size_t __user *oldlenp,
 182                                          void __user *newval, size_t newlen)
 183 {
 184         char val[TCP_CA_NAME_MAX];
 185         ctl_table tbl = {
 186                 .data = val,
 187                 .maxlen = TCP_CA_NAME_MAX,
 188         };
 189         int ret;
 190
 191         tcp_get_default_congestion_control(val);
 192         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 193         if (ret == 0 && newval && newlen)
 194                 ret = tcp_set_default_congestion_control(val);
 195         return ret;
 196 }
 197
 198 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 199                                                  int write, struct file * filp,
 200                                                  void __user *buffer, size_t *lenp,
 201                                                  loff_t *ppos)
 202 {
 203         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 204         int ret;
 205
 206         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 207         if (!tbl.data)
 208                 return -ENOMEM;
 209         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 210         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 211         kfree(tbl.data);
 212         return ret;
 213 }
 214
 215 static int proc_allowed_congestion_control(ctl_table *ctl,
 216                                            int write, struct file * filp,
 217                                            void __user *buffer, size_t *lenp,
 218                                            loff_t *ppos)
 219 {
 220         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 221         int ret;
 222
 223         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 224         if (!tbl.data)
 225                 return -ENOMEM;
 226
 227         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 228         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 229         if (write && ret == 0)
 230                 ret = tcp_set_allowed_congestion_control(tbl.data);
 231         kfree(tbl.data);
 232         return ret;
 233 }
 234
 235 static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
 236                                                int nlen, void __user *oldval,
 237                                                size_t __user *oldlenp,
 238                                                void __user *newval,
 239                                                size_t newlen)
 240 {
 241         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 242         int ret;
 243
 244         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 245         if (!tbl.data)
 246                 return -ENOMEM;
 247
 248         tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
 249         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 250         if (ret == 0 && newval && newlen)
 251                 ret = tcp_set_allowed_congestion_control(tbl.data);
 252         kfree(tbl.data);
 253
 254         return ret;
 255
 256 }
 257
 258 ctl_table ipv4_table[] = {
 259         {
 260                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 261                 .procname       = "tcp_timestamps",
 262                 .data           = &sysctl_tcp_timestamps,
 263                 .maxlen         = sizeof(int),
 264                 .mode           = 0644,
 265                 .proc_handler   = &proc_dointvec
 266         },
 267         {
 268                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 269                 .procname       = "tcp_window_scaling",
 270                 .data           = &sysctl_tcp_window_scaling,
 271                 .maxlen         = sizeof(int),
 272                 .mode           = 0644,
 273                 .proc_handler   = &proc_dointvec
 274         },
 275         {
 276                 .ctl_name       = NET_IPV4_TCP_SACK,
 277                 .procname       = "tcp_sack",
 278                 .data           = &sysctl_tcp_sack,
 279                 .maxlen         = sizeof(int),
 280                 .mode           = 0644,
 281                 .proc_handler   = &proc_dointvec
 282         },
 283         {
 284                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 285                 .procname       = "tcp_retrans_collapse",
 286                 .data           = &sysctl_tcp_retrans_collapse,
 287                 .maxlen         = sizeof(int),
 288                 .mode           = 0644,
 289                 .proc_handler   = &proc_dointvec
 290         },
 291         {
 292                 .ctl_name       = NET_IPV4_FORWARD,
 293                 .procname       = "ip_forward",
 294                 .data           = &IPV4_DEVCONF_ALL(FORWARDING),
 295                 .maxlen         = sizeof(int),
 296                 .mode           = 0644,
 297                 .proc_handler   = &ipv4_sysctl_forward,
 298                 .strategy       = &ipv4_sysctl_forward_strategy
 299         },
 300         {
 301                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 302                 .procname       = "ip_default_ttl",
 303                 .data           = &sysctl_ip_default_ttl,
 304                 .maxlen         = sizeof(int),
 305                 .mode           = 0644,
 306                 .proc_handler   = &ipv4_doint_and_flush,
 307                 .strategy       = &ipv4_doint_and_flush_strategy,
 308         },
 309         {
 310                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 311                 .procname       = "ip_no_pmtu_disc",
 312                 .data           = &ipv4_config.no_pmtu_disc,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = &proc_dointvec
 316         },
 317         {
 318                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 319                 .procname       = "ip_nonlocal_bind",
 320                 .data           = &sysctl_ip_nonlocal_bind,
 321                 .maxlen         = sizeof(int),
 322                 .mode           = 0644,
 323                 .proc_handler   = &proc_dointvec
 324         },
 325         {
 326                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 327                 .procname       = "tcp_syn_retries",
 328                 .data           = &sysctl_tcp_syn_retries,
 329                 .maxlen         = sizeof(int),
 330                 .mode           = 0644,
 331                 .proc_handler   = &proc_dointvec
 332         },
 333         {
 334                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 335                 .procname       = "tcp_synack_retries",
 336                 .data           = &sysctl_tcp_synack_retries,
 337                 .maxlen         = sizeof(int),
 338                 .mode           = 0644,
 339                 .proc_handler   = &proc_dointvec
 340         },
 341         {
 342                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 343                 .procname       = "tcp_max_orphans",
 344                 .data           = &sysctl_tcp_max_orphans,
 345                 .maxlen         = sizeof(int),
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_dointvec
 348         },
 349         {
 350                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 351                 .procname       = "tcp_max_tw_buckets",
 352                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 353                 .maxlen         = sizeof(int),
 354                 .mode           = 0644,
 355                 .proc_handler   = &proc_dointvec
 356         },
 357         {
 358                 .ctl_name       = NET_IPV4_IPFRAG_HIGH_THRESH,
 359                 .procname       = "ipfrag_high_thresh",
 360                 .data           = &sysctl_ipfrag_high_thresh,
 361                 .maxlen         = sizeof(int),
 362                 .mode           = 0644,
 363                 .proc_handler   = &proc_dointvec
 364         },
 365         {
 366                 .ctl_name       = NET_IPV4_IPFRAG_LOW_THRESH,
 367                 .procname       = "ipfrag_low_thresh",
 368                 .data           = &sysctl_ipfrag_low_thresh,
 369                 .maxlen         = sizeof(int),
 370                 .mode           = 0644,
 371                 .proc_handler   = &proc_dointvec
 372         },
 373         {
 374                 .ctl_name       = NET_IPV4_DYNADDR,
 375                 .procname       = "ip_dynaddr",
 376                 .data           = &sysctl_ip_dynaddr,
 377                 .maxlen         = sizeof(int),
 378                 .mode           = 0644,
 379                 .proc_handler   = &proc_dointvec
 380         },
 381         {
 382                 .ctl_name       = NET_IPV4_IPFRAG_TIME,
 383                 .procname       = "ipfrag_time",
 384                 .data           = &sysctl_ipfrag_time,
 385                 .maxlen         = sizeof(int),
 386                 .mode           = 0644,
 387                 .proc_handler   = &proc_dointvec_jiffies,
 388                 .strategy       = &sysctl_jiffies
 389         },
 390         {
 391                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 392                 .procname       = "tcp_keepalive_time",
 393                 .data           = &sysctl_tcp_keepalive_time,
 394                 .maxlen         = sizeof(int),
 395                 .mode           = 0644,
 396                 .proc_handler   = &proc_dointvec_jiffies,
 397                 .strategy       = &sysctl_jiffies
 398         },
 399         {
 400                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 401                 .procname       = "tcp_keepalive_probes",
 402                 .data           = &sysctl_tcp_keepalive_probes,
 403                 .maxlen         = sizeof(int),
 404                 .mode           = 0644,
 405                 .proc_handler   = &proc_dointvec
 406         },
 407         {
 408                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 409                 .procname       = "tcp_keepalive_intvl",
 410                 .data           = &sysctl_tcp_keepalive_intvl,
 411                 .maxlen         = sizeof(int),
 412                 .mode           = 0644,
 413                 .proc_handler   = &proc_dointvec_jiffies,
 414                 .strategy       = &sysctl_jiffies
 415         },
 416         {
 417                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 418                 .procname       = "tcp_retries1",
 419                 .data           = &sysctl_tcp_retries1,
 420                 .maxlen         = sizeof(int),
 421                 .mode           = 0644,
 422                 .proc_handler   = &proc_dointvec_minmax,
 423                 .strategy       = &sysctl_intvec,
 424                 .extra2         = &tcp_retr1_max
 425         },
 426         {
 427                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 428                 .procname       = "tcp_retries2",
 429                 .data           = &sysctl_tcp_retries2,
 430                 .maxlen         = sizeof(int),
 431                 .mode           = 0644,
 432                 .proc_handler   = &proc_dointvec
 433         },
 434         {
 435                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 436                 .procname       = "tcp_fin_timeout",
 437                 .data           = &sysctl_tcp_fin_timeout,
 438                 .maxlen         = sizeof(int),
 439                 .mode           = 0644,
 440                 .proc_handler   = &proc_dointvec_jiffies,
 441                 .strategy       = &sysctl_jiffies
 442         },
 443 #ifdef CONFIG_SYN_COOKIES
 444         {
 445                 .ctl_name       = NET_TCP_SYNCOOKIES,
 446                 .procname       = "tcp_syncookies",
 447                 .data           = &sysctl_tcp_syncookies,
 448                 .maxlen         = sizeof(int),
 449                 .mode           = 0644,
 450                 .proc_handler   = &proc_dointvec
 451         },
 452 #endif
 453         {
 454                 .ctl_name       = NET_TCP_TW_RECYCLE,
 455                 .procname       = "tcp_tw_recycle",
 456                 .data           = &tcp_death_row.sysctl_tw_recycle,
 457                 .maxlen         = sizeof(int),
 458                 .mode           = 0644,
 459                 .proc_handler   = &proc_dointvec
 460         },
 461         {
 462                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 463                 .procname       = "tcp_abort_on_overflow",
 464                 .data           = &sysctl_tcp_abort_on_overflow,
 465                 .maxlen         = sizeof(int),
 466                 .mode           = 0644,
 467                 .proc_handler   = &proc_dointvec
 468         },
 469         {
 470                 .ctl_name       = NET_TCP_STDURG,
 471                 .procname       = "tcp_stdurg",
 472                 .data           = &sysctl_tcp_stdurg,
 473                 .maxlen         = sizeof(int),
 474                 .mode           = 0644,
 475                 .proc_handler   = &proc_dointvec
 476         },
 477         {
 478                 .ctl_name       = NET_TCP_RFC1337,
 479                 .procname       = "tcp_rfc1337",
 480                 .data           = &sysctl_tcp_rfc1337,
 481                 .maxlen         = sizeof(int),
 482                 .mode           = 0644,
 483                 .proc_handler   = &proc_dointvec
 484         },
 485         {
 486                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 487                 .procname       = "tcp_max_syn_backlog",
 488                 .data           = &sysctl_max_syn_backlog,
 489                 .maxlen         = sizeof(int),
 490                 .mode           = 0644,
 491                 .proc_handler   = &proc_dointvec
 492         },
 493         {
 494                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 495                 .procname       = "ip_local_port_range",
 496                 .data           = &sysctl_local_port_range,
 497                 .maxlen         = sizeof(sysctl_local_port_range),
 498                 .mode           = 0644,
 499                 .proc_handler   = &ipv4_local_port_range,
 500                 .strategy       = &ipv4_sysctl_local_port_range,
 501         },
 502         {
 503                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 504                 .procname       = "icmp_echo_ignore_all",
 505                 .data           = &sysctl_icmp_echo_ignore_all,
 506                 .maxlen         = sizeof(int),
 507                 .mode           = 0644,
 508                 .proc_handler   = &proc_dointvec
 509         },
 510         {
 511                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 512                 .procname       = "icmp_echo_ignore_broadcasts",
 513                 .data           = &sysctl_icmp_echo_ignore_broadcasts,
 514                 .maxlen         = sizeof(int),
 515                 .mode           = 0644,
 516                 .proc_handler   = &proc_dointvec
 517         },
 518         {
 519                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 520                 .procname       = "icmp_ignore_bogus_error_responses",
 521                 .data           = &sysctl_icmp_ignore_bogus_error_responses,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = &proc_dointvec
 525         },
 526         {
 527                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 528                 .procname       = "icmp_errors_use_inbound_ifaddr",
 529                 .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
 530                 .maxlen         = sizeof(int),
 531                 .mode           = 0644,
 532                 .proc_handler   = &proc_dointvec
 533         },
 534         {
 535                 .ctl_name       = NET_IPV4_ROUTE,
 536                 .procname       = "route",
 537                 .maxlen         = 0,
 538                 .mode           = 0555,
 539                 .child          = ipv4_route_table
 540         },
 541 #ifdef CONFIG_IP_MULTICAST
 542         {
 543                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 544                 .procname       = "igmp_max_memberships",
 545                 .data           = &sysctl_igmp_max_memberships,
 546                 .maxlen         = sizeof(int),
 547                 .mode           = 0644,
 548                 .proc_handler   = &proc_dointvec
 549         },
 550
 551 #endif
 552         {
 553                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 554                 .procname       = "igmp_max_msf",
 555                 .data           = &sysctl_igmp_max_msf,
 556                 .maxlen         = sizeof(int),
 557                 .mode           = 0644,
 558                 .proc_handler   = &proc_dointvec
 559         },
 560         {
 561                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 562                 .procname       = "inet_peer_threshold",
 563                 .data           = &inet_peer_threshold,
 564                 .maxlen         = sizeof(int),
 565                 .mode           = 0644,
 566                 .proc_handler   = &proc_dointvec
 567         },
 568         {
 569                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 570                 .procname       = "inet_peer_minttl",
 571                 .data           = &inet_peer_minttl,
 572                 .maxlen         = sizeof(int),
 573                 .mode           = 0644,
 574                 .proc_handler   = &proc_dointvec_jiffies,
 575                 .strategy       = &sysctl_jiffies
 576         },
 577         {
 578                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 579                 .procname       = "inet_peer_maxttl",
 580                 .data           = &inet_peer_maxttl,
 581                 .maxlen         = sizeof(int),
 582                 .mode           = 0644,
 583                 .proc_handler   = &proc_dointvec_jiffies,
 584                 .strategy       = &sysctl_jiffies
 585         },
 586         {
 587                 .ctl_name       = NET_IPV4_INET_PEER_GC_MINTIME,
 588                 .procname       = "inet_peer_gc_mintime",
 589                 .data           = &inet_peer_gc_mintime,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = &proc_dointvec_jiffies,
 593                 .strategy       = &sysctl_jiffies
 594         },
 595         {
 596                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 597                 .procname       = "inet_peer_gc_maxtime",
 598                 .data           = &inet_peer_gc_maxtime,
 599                 .maxlen         = sizeof(int),
 600                 .mode           = 0644,
 601                 .proc_handler   = &proc_dointvec_jiffies,
 602                 .strategy       = &sysctl_jiffies
 603         },
 604         {
 605                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 606                 .procname       = "tcp_orphan_retries",
 607                 .data           = &sysctl_tcp_orphan_retries,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec
 611         },
 612         {
 613                 .ctl_name       = NET_TCP_FACK,
 614                 .procname       = "tcp_fack",
 615                 .data           = &sysctl_tcp_fack,
 616                 .maxlen         = sizeof(int),
 617                 .mode           = 0644,
 618                 .proc_handler   = &proc_dointvec
 619         },
 620         {
 621                 .ctl_name       = NET_TCP_REORDERING,
 622                 .procname       = "tcp_reordering",
 623                 .data           = &sysctl_tcp_reordering,
 624                 .maxlen         = sizeof(int),
 625                 .mode           = 0644,
 626                 .proc_handler   = &proc_dointvec
 627         },
 628         {
 629                 .ctl_name       = NET_TCP_ECN,
 630                 .procname       = "tcp_ecn",
 631                 .data           = &sysctl_tcp_ecn,
 632                 .maxlen         = sizeof(int),
 633                 .mode           = 0644,
 634                 .proc_handler   = &proc_dointvec
 635         },
 636         {
 637                 .ctl_name       = NET_TCP_DSACK,
 638                 .procname       = "tcp_dsack",
 639                 .data           = &sysctl_tcp_dsack,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = &proc_dointvec
 643         },
 644         {
 645                 .ctl_name       = NET_TCP_MEM,
 646                 .procname       = "tcp_mem",
 647                 .data           = &sysctl_tcp_mem,
 648                 .maxlen         = sizeof(sysctl_tcp_mem),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec
 651         },
 652         {
 653                 .ctl_name       = NET_TCP_WMEM,
 654                 .procname       = "tcp_wmem",
 655                 .data           = &sysctl_tcp_wmem,
 656                 .maxlen         = sizeof(sysctl_tcp_wmem),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_dointvec
 659         },
 660         {
 661                 .ctl_name       = NET_TCP_RMEM,
 662                 .procname       = "tcp_rmem",
 663                 .data           = &sysctl_tcp_rmem,
 664                 .maxlen         = sizeof(sysctl_tcp_rmem),
 665                 .mode           = 0644,
 666                 .proc_handler   = &proc_dointvec
 667         },
 668         {
 669                 .ctl_name       = NET_TCP_APP_WIN,
 670                 .procname       = "tcp_app_win",
 671                 .data           = &sysctl_tcp_app_win,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = &proc_dointvec
 675         },
 676         {
 677                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 678                 .procname       = "tcp_adv_win_scale",
 679                 .data           = &sysctl_tcp_adv_win_scale,
 680                 .maxlen         = sizeof(int),
 681                 .mode           = 0644,
 682                 .proc_handler   = &proc_dointvec
 683         },
 684         {
 685                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 686                 .procname       = "icmp_ratelimit",
 687                 .data           = &sysctl_icmp_ratelimit,
 688                 .maxlen         = sizeof(int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_dointvec
 691         },
 692         {
 693                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 694                 .procname       = "icmp_ratemask",
 695                 .data           = &sysctl_icmp_ratemask,
 696                 .maxlen         = sizeof(int),
 697                 .mode           = 0644,
 698                 .proc_handler   = &proc_dointvec
 699         },
 700         {
 701                 .ctl_name       = NET_TCP_TW_REUSE,
 702                 .procname       = "tcp_tw_reuse",
 703                 .data           = &sysctl_tcp_tw_reuse,
 704                 .maxlen         = sizeof(int),
 705                 .mode           = 0644,
 706                 .proc_handler   = &proc_dointvec
 707         },
 708         {
 709                 .ctl_name       = NET_TCP_FRTO,
 710                 .procname       = "tcp_frto",
 711                 .data           = &sysctl_tcp_frto,
 712                 .maxlen         = sizeof(int),
 713                 .mode           = 0644,
 714                 .proc_handler   = &proc_dointvec
 715         },
 716         {
 717                 .ctl_name       = NET_TCP_FRTO_RESPONSE,
 718                 .procname       = "tcp_frto_response",
 719                 .data           = &sysctl_tcp_frto_response,
 720                 .maxlen         = sizeof(int),
 721                 .mode           = 0644,
 722                 .proc_handler   = &proc_dointvec
 723         },
 724         {
 725                 .ctl_name       = NET_TCP_LOW_LATENCY,
 726                 .procname       = "tcp_low_latency",
 727                 .data           = &sysctl_tcp_low_latency,
 728                 .maxlen         = sizeof(int),
 729                 .mode           = 0644,
 730                 .proc_handler   = &proc_dointvec
 731         },
 732         {
 733                 .ctl_name       = NET_IPV4_IPFRAG_SECRET_INTERVAL,
 734                 .procname       = "ipfrag_secret_interval",
 735                 .data           = &sysctl_ipfrag_secret_interval,
 736                 .maxlen         = sizeof(int),
 737                 .mode           = 0644,
 738                 .proc_handler   = &proc_dointvec_jiffies,
 739                 .strategy       = &sysctl_jiffies
 740         },
 741         {
 742                 .ctl_name       = NET_IPV4_IPFRAG_MAX_DIST,
 743                 .procname       = "ipfrag_max_dist",
 744                 .data           = &sysctl_ipfrag_max_dist,
 745                 .maxlen         = sizeof(int),
 746                 .mode           = 0644,
 747                 .proc_handler   = &proc_dointvec_minmax,
 748                 .extra1         = &zero
 749         },
 750         {
 751                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 752                 .procname       = "tcp_no_metrics_save",
 753                 .data           = &sysctl_tcp_nometrics_save,
 754                 .maxlen         = sizeof(int),
 755                 .mode           = 0644,
 756                 .proc_handler   = &proc_dointvec,
 757         },
 758         {
 759                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 760                 .procname       = "tcp_moderate_rcvbuf",
 761                 .data           = &sysctl_tcp_moderate_rcvbuf,
 762                 .maxlen         = sizeof(int),
 763                 .mode           = 0644,
 764                 .proc_handler   = &proc_dointvec,
 765         },
 766         {
 767                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 768                 .procname       = "tcp_tso_win_divisor",
 769                 .data           = &sysctl_tcp_tso_win_divisor,
 770                 .maxlen         = sizeof(int),
 771                 .mode           = 0644,
 772                 .proc_handler   = &proc_dointvec,
 773         },
 774         {
 775                 .ctl_name       = NET_TCP_CONG_CONTROL,
 776                 .procname       = "tcp_congestion_control",
 777                 .mode           = 0644,
 778                 .maxlen         = TCP_CA_NAME_MAX,
 779                 .proc_handler   = &proc_tcp_congestion_control,
 780                 .strategy       = &sysctl_tcp_congestion_control,
 781         },
 782         {
 783                 .ctl_name       = NET_TCP_ABC,
 784                 .procname       = "tcp_abc",
 785                 .data           = &sysctl_tcp_abc,
 786                 .maxlen         = sizeof(int),
 787                 .mode           = 0644,
 788                 .proc_handler   = &proc_dointvec,
 789         },
 790         {
 791                 .ctl_name       = NET_TCP_MTU_PROBING,
 792                 .procname       = "tcp_mtu_probing",
 793                 .data           = &sysctl_tcp_mtu_probing,
 794                 .maxlen         = sizeof(int),
 795                 .mode           = 0644,
 796                 .proc_handler   = &proc_dointvec,
 797         },
 798         {
 799                 .ctl_name       = NET_TCP_BASE_MSS,
 800                 .procname       = "tcp_base_mss",
 801                 .data           = &sysctl_tcp_base_mss,
 802                 .maxlen         = sizeof(int),
 803                 .mode           = 0644,
 804                 .proc_handler   = &proc_dointvec,
 805         },
 806         {
 807                 .ctl_name       = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
 808                 .procname       = "tcp_workaround_signed_windows",
 809                 .data           = &sysctl_tcp_workaround_signed_windows,
 810                 .maxlen         = sizeof(int),
 811                 .mode           = 0644,
 812                 .proc_handler   = &proc_dointvec
 813         },
 814 #ifdef CONFIG_NET_DMA
 815         {
 816                 .ctl_name       = NET_TCP_DMA_COPYBREAK,
 817                 .procname       = "tcp_dma_copybreak",
 818                 .data           = &sysctl_tcp_dma_copybreak,
 819                 .maxlen         = sizeof(int),
 820                 .mode           = 0644,
 821                 .proc_handler   = &proc_dointvec
 822         },
 823 #endif
 824         {
 825                 .ctl_name       = NET_TCP_SLOW_START_AFTER_IDLE,
 826                 .procname       = "tcp_slow_start_after_idle",
 827                 .data           = &sysctl_tcp_slow_start_after_idle,
 828                 .maxlen         = sizeof(int),
 829                 .mode           = 0644,
 830                 .proc_handler   = &proc_dointvec
 831         },
 832 #ifdef CONFIG_NETLABEL
 833         {
 834                 .ctl_name       = NET_CIPSOV4_CACHE_ENABLE,
 835                 .procname       = "cipso_cache_enable",
 836                 .data           = &cipso_v4_cache_enabled,
 837                 .maxlen         = sizeof(int),
 838                 .mode           = 0644,
 839                 .proc_handler   = &proc_dointvec,
 840         },
 841         {
 842                 .ctl_name       = NET_CIPSOV4_CACHE_BUCKET_SIZE,
 843                 .procname       = "cipso_cache_bucket_size",
 844                 .data           = &cipso_v4_cache_bucketsize,
 845                 .maxlen         = sizeof(int),
 846                 .mode           = 0644,
 847                 .proc_handler   = &proc_dointvec,
 848         },
 849         {
 850                 .ctl_name       = NET_CIPSOV4_RBM_OPTFMT,
 851                 .procname       = "cipso_rbm_optfmt",
 852                 .data           = &cipso_v4_rbm_optfmt,
 853                 .maxlen         = sizeof(int),
 854                 .mode           = 0644,
 855                 .proc_handler   = &proc_dointvec,
 856         },
 857         {
 858                 .ctl_name       = NET_CIPSOV4_RBM_STRICTVALID,
 859                 .procname       = "cipso_rbm_strictvalid",
 860                 .data           = &cipso_v4_rbm_strictvalid,
 861                 .maxlen         = sizeof(int),
 862                 .mode           = 0644,
 863                 .proc_handler   = &proc_dointvec,
 864         },
 865 #endif /* CONFIG_NETLABEL */
 866         {
 867                 .ctl_name       = NET_TCP_AVAIL_CONG_CONTROL,
 868                 .procname       = "tcp_available_congestion_control",
 869                 .maxlen         = TCP_CA_BUF_MAX,
 870                 .mode           = 0444,
 871                 .proc_handler   = &proc_tcp_available_congestion_control,
 872         },
 873         {
 874                 .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
 875                 .procname       = "tcp_allowed_congestion_control",
 876                 .maxlen         = TCP_CA_BUF_MAX,
 877                 .mode           = 0644,
 878                 .proc_handler   = &proc_allowed_congestion_control,
 879                 .strategy       = &strategy_allowed_congestion_control,
 880         },
 881         {
 882                 .ctl_name       = NET_TCP_MAX_SSTHRESH,
 883                 .procname       = "tcp_max_ssthresh",
 884                 .data           = &sysctl_tcp_max_ssthresh,
 885                 .maxlen         = sizeof(int),
 886                 .mode           = 0644,
 887                 .proc_handler   = &proc_dointvec,
 888         },
 889         { .ctl_name = 0 }
 890 };
 891
 892 #endif /* CONFIG_SYSCTL */
 893
 894 EXPORT_SYMBOL(ipv4_config);