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 <linux/init.h>
  17 #include <net/snmp.h>
  18 #include <net/icmp.h>
  19 #include <net/ip.h>
  20 #include <net/route.h>
  21 #include <net/tcp.h>
  22 #include <net/cipso_ipv4.h>
  23 #include <net/inet_frag.h>
  24
  25 static int zero;
  26 static int tcp_retr1_max = 255;
  27 static int ip_local_port_range_min[] = { 1, 1 };
  28 static int ip_local_port_range_max[] = { 65535, 65535 };
  29
  30 extern seqlock_t sysctl_port_range_lock;
  31 extern int sysctl_local_port_range[2];
  32
  33 /* Update system visible IP port range */
  34 static void set_local_port_range(int range[2])
  35 {
  36         write_seqlock(&sysctl_port_range_lock);
  37         sysctl_local_port_range[0] = range[0];
  38         sysctl_local_port_range[1] = range[1];
  39         write_sequnlock(&sysctl_port_range_lock);
  40 }
  41
  42 /* Validate changes from /proc interface. */
  43 static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
  44                                  void __user *buffer,
  45                                  size_t *lenp, loff_t *ppos)
  46 {
  47         int ret;
  48         int range[2] = { sysctl_local_port_range[0],
  49                          sysctl_local_port_range[1] };
  50         ctl_table tmp = {
  51                 .data = &range,
  52                 .maxlen = sizeof(range),
  53                 .mode = table->mode,
  54                 .extra1 = &ip_local_port_range_min,
  55                 .extra2 = &ip_local_port_range_max,
  56         };
  57
  58         ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
  59
  60         if (write && ret == 0) {
  61                 if (range[1] < range[0])
  62                         ret = -EINVAL;
  63                 else
  64                         set_local_port_range(range);
  65         }
  66
  67         return ret;
  68 }
  69
  70 /* Validate changes from sysctl interface. */
  71 static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
  72                                          int nlen, void __user *oldval,
  73                                          size_t __user *oldlenp,
  74                                         void __user *newval, size_t newlen)
  75 {
  76         int ret;
  77         int range[2] = { sysctl_local_port_range[0],
  78                          sysctl_local_port_range[1] };
  79         ctl_table tmp = {
  80                 .data = &range,
  81                 .maxlen = sizeof(range),
  82                 .mode = table->mode,
  83                 .extra1 = &ip_local_port_range_min,
  84                 .extra2 = &ip_local_port_range_max,
  85         };
  86
  87         ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
  88         if (ret == 0 && newval && newlen) {
  89                 if (range[1] < range[0])
  90                         ret = -EINVAL;
  91                 else
  92                         set_local_port_range(range);
  93         }
  94         return ret;
  95 }
  96
  97
  98 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
  99                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 100 {
 101         char val[TCP_CA_NAME_MAX];
 102         ctl_table tbl = {
 103                 .data = val,
 104                 .maxlen = TCP_CA_NAME_MAX,
 105         };
 106         int ret;
 107
 108         tcp_get_default_congestion_control(val);
 109
 110         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 111         if (write && ret == 0)
 112                 ret = tcp_set_default_congestion_control(val);
 113         return ret;
 114 }
 115
 116 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
 117                                          int nlen, void __user *oldval,
 118                                          size_t __user *oldlenp,
 119                                          void __user *newval, size_t newlen)
 120 {
 121         char val[TCP_CA_NAME_MAX];
 122         ctl_table tbl = {
 123                 .data = val,
 124                 .maxlen = TCP_CA_NAME_MAX,
 125         };
 126         int ret;
 127
 128         tcp_get_default_congestion_control(val);
 129         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 130         if (ret == 1 && newval && newlen)
 131                 ret = tcp_set_default_congestion_control(val);
 132         return ret;
 133 }
 134
 135 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 136                                                  int write, struct file * filp,
 137                                                  void __user *buffer, size_t *lenp,
 138                                                  loff_t *ppos)
 139 {
 140         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 141         int ret;
 142
 143         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 144         if (!tbl.data)
 145                 return -ENOMEM;
 146         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 147         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 148         kfree(tbl.data);
 149         return ret;
 150 }
 151
 152 static int proc_allowed_congestion_control(ctl_table *ctl,
 153                                            int write, struct file * filp,
 154                                            void __user *buffer, size_t *lenp,
 155                                            loff_t *ppos)
 156 {
 157         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 158         int ret;
 159
 160         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 161         if (!tbl.data)
 162                 return -ENOMEM;
 163
 164         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 165         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 166         if (write && ret == 0)
 167                 ret = tcp_set_allowed_congestion_control(tbl.data);
 168         kfree(tbl.data);
 169         return ret;
 170 }
 171
 172 static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
 173                                                int nlen, void __user *oldval,
 174                                                size_t __user *oldlenp,
 175                                                void __user *newval,
 176                                                size_t newlen)
 177 {
 178         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 179         int ret;
 180
 181         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 182         if (!tbl.data)
 183                 return -ENOMEM;
 184
 185         tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
 186         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 187         if (ret == 0 && newval && newlen)
 188                 ret = tcp_set_allowed_congestion_control(tbl.data);
 189         kfree(tbl.data);
 190
 191         return ret;
 192
 193 }
 194
 195 static struct ctl_table ipv4_table[] = {
 196         {
 197                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 198                 .procname       = "tcp_timestamps",
 199                 .data           = &sysctl_tcp_timestamps,
 200                 .maxlen         = sizeof(int),
 201                 .mode           = 0644,
 202                 .proc_handler   = &proc_dointvec
 203         },
 204         {
 205                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 206                 .procname       = "tcp_window_scaling",
 207                 .data           = &sysctl_tcp_window_scaling,
 208                 .maxlen         = sizeof(int),
 209                 .mode           = 0644,
 210                 .proc_handler   = &proc_dointvec
 211         },
 212         {
 213                 .ctl_name       = NET_IPV4_TCP_SACK,
 214                 .procname       = "tcp_sack",
 215                 .data           = &sysctl_tcp_sack,
 216                 .maxlen         = sizeof(int),
 217                 .mode           = 0644,
 218                 .proc_handler   = &proc_dointvec
 219         },
 220         {
 221                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 222                 .procname       = "tcp_retrans_collapse",
 223                 .data           = &sysctl_tcp_retrans_collapse,
 224                 .maxlen         = sizeof(int),
 225                 .mode           = 0644,
 226                 .proc_handler   = &proc_dointvec
 227         },
 228         {
 229                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 230                 .procname       = "ip_default_ttl",
 231                 .data           = &sysctl_ip_default_ttl,
 232                 .maxlen         = sizeof(int),
 233                 .mode           = 0644,
 234                 .proc_handler   = &ipv4_doint_and_flush,
 235                 .strategy       = &ipv4_doint_and_flush_strategy,
 236         },
 237         {
 238                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 239                 .procname       = "ip_no_pmtu_disc",
 240                 .data           = &ipv4_config.no_pmtu_disc,
 241                 .maxlen         = sizeof(int),
 242                 .mode           = 0644,
 243                 .proc_handler   = &proc_dointvec
 244         },
 245         {
 246                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 247                 .procname       = "ip_nonlocal_bind",
 248                 .data           = &sysctl_ip_nonlocal_bind,
 249                 .maxlen         = sizeof(int),
 250                 .mode           = 0644,
 251                 .proc_handler   = &proc_dointvec
 252         },
 253         {
 254                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 255                 .procname       = "tcp_syn_retries",
 256                 .data           = &sysctl_tcp_syn_retries,
 257                 .maxlen         = sizeof(int),
 258                 .mode           = 0644,
 259                 .proc_handler   = &proc_dointvec
 260         },
 261         {
 262                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 263                 .procname       = "tcp_synack_retries",
 264                 .data           = &sysctl_tcp_synack_retries,
 265                 .maxlen         = sizeof(int),
 266                 .mode           = 0644,
 267                 .proc_handler   = &proc_dointvec
 268         },
 269         {
 270                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 271                 .procname       = "tcp_max_orphans",
 272                 .data           = &sysctl_tcp_max_orphans,
 273                 .maxlen         = sizeof(int),
 274                 .mode           = 0644,
 275                 .proc_handler   = &proc_dointvec
 276         },
 277         {
 278                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 279                 .procname       = "tcp_max_tw_buckets",
 280                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 281                 .maxlen         = sizeof(int),
 282                 .mode           = 0644,
 283                 .proc_handler   = &proc_dointvec
 284         },
 285         {
 286                 .ctl_name       = NET_IPV4_IPFRAG_HIGH_THRESH,
 287                 .procname       = "ipfrag_high_thresh",
 288                 .data           = &ip4_frags_ctl.high_thresh,
 289                 .maxlen         = sizeof(int),
 290                 .mode           = 0644,
 291                 .proc_handler   = &proc_dointvec
 292         },
 293         {
 294                 .ctl_name       = NET_IPV4_IPFRAG_LOW_THRESH,
 295                 .procname       = "ipfrag_low_thresh",
 296                 .data           = &ip4_frags_ctl.low_thresh,
 297                 .maxlen         = sizeof(int),
 298                 .mode           = 0644,
 299                 .proc_handler   = &proc_dointvec
 300         },
 301         {
 302                 .ctl_name       = NET_IPV4_DYNADDR,
 303                 .procname       = "ip_dynaddr",
 304                 .data           = &sysctl_ip_dynaddr,
 305                 .maxlen         = sizeof(int),
 306                 .mode           = 0644,
 307                 .proc_handler   = &proc_dointvec
 308         },
 309         {
 310                 .ctl_name       = NET_IPV4_IPFRAG_TIME,
 311                 .procname       = "ipfrag_time",
 312                 .data           = &ip4_frags_ctl.timeout,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = &proc_dointvec_jiffies,
 316                 .strategy       = &sysctl_jiffies
 317         },
 318         {
 319                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 320                 .procname       = "tcp_keepalive_time",
 321                 .data           = &sysctl_tcp_keepalive_time,
 322                 .maxlen         = sizeof(int),
 323                 .mode           = 0644,
 324                 .proc_handler   = &proc_dointvec_jiffies,
 325                 .strategy       = &sysctl_jiffies
 326         },
 327         {
 328                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 329                 .procname       = "tcp_keepalive_probes",
 330                 .data           = &sysctl_tcp_keepalive_probes,
 331                 .maxlen         = sizeof(int),
 332                 .mode           = 0644,
 333                 .proc_handler   = &proc_dointvec
 334         },
 335         {
 336                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 337                 .procname       = "tcp_keepalive_intvl",
 338                 .data           = &sysctl_tcp_keepalive_intvl,
 339                 .maxlen         = sizeof(int),
 340                 .mode           = 0644,
 341                 .proc_handler   = &proc_dointvec_jiffies,
 342                 .strategy       = &sysctl_jiffies
 343         },
 344         {
 345                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 346                 .procname       = "tcp_retries1",
 347                 .data           = &sysctl_tcp_retries1,
 348                 .maxlen         = sizeof(int),
 349                 .mode           = 0644,
 350                 .proc_handler   = &proc_dointvec_minmax,
 351                 .strategy       = &sysctl_intvec,
 352                 .extra2         = &tcp_retr1_max
 353         },
 354         {
 355                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 356                 .procname       = "tcp_retries2",
 357                 .data           = &sysctl_tcp_retries2,
 358                 .maxlen         = sizeof(int),
 359                 .mode           = 0644,
 360                 .proc_handler   = &proc_dointvec
 361         },
 362         {
 363                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 364                 .procname       = "tcp_fin_timeout",
 365                 .data           = &sysctl_tcp_fin_timeout,
 366                 .maxlen         = sizeof(int),
 367                 .mode           = 0644,
 368                 .proc_handler   = &proc_dointvec_jiffies,
 369                 .strategy       = &sysctl_jiffies
 370         },
 371 #ifdef CONFIG_SYN_COOKIES
 372         {
 373                 .ctl_name       = NET_TCP_SYNCOOKIES,
 374                 .procname       = "tcp_syncookies",
 375                 .data           = &sysctl_tcp_syncookies,
 376                 .maxlen         = sizeof(int),
 377                 .mode           = 0644,
 378                 .proc_handler   = &proc_dointvec
 379         },
 380 #endif
 381         {
 382                 .ctl_name       = NET_TCP_TW_RECYCLE,
 383                 .procname       = "tcp_tw_recycle",
 384                 .data           = &tcp_death_row.sysctl_tw_recycle,
 385                 .maxlen         = sizeof(int),
 386                 .mode           = 0644,
 387                 .proc_handler   = &proc_dointvec
 388         },
 389         {
 390                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 391                 .procname       = "tcp_abort_on_overflow",
 392                 .data           = &sysctl_tcp_abort_on_overflow,
 393                 .maxlen         = sizeof(int),
 394                 .mode           = 0644,
 395                 .proc_handler   = &proc_dointvec
 396         },
 397         {
 398                 .ctl_name       = NET_TCP_STDURG,
 399                 .procname       = "tcp_stdurg",
 400                 .data           = &sysctl_tcp_stdurg,
 401                 .maxlen         = sizeof(int),
 402                 .mode           = 0644,
 403                 .proc_handler   = &proc_dointvec
 404         },
 405         {
 406                 .ctl_name       = NET_TCP_RFC1337,
 407                 .procname       = "tcp_rfc1337",
 408                 .data           = &sysctl_tcp_rfc1337,
 409                 .maxlen         = sizeof(int),
 410                 .mode           = 0644,
 411                 .proc_handler   = &proc_dointvec
 412         },
 413         {
 414                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 415                 .procname       = "tcp_max_syn_backlog",
 416                 .data           = &sysctl_max_syn_backlog,
 417                 .maxlen         = sizeof(int),
 418                 .mode           = 0644,
 419                 .proc_handler   = &proc_dointvec
 420         },
 421         {
 422                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 423                 .procname       = "ip_local_port_range",
 424                 .data           = &sysctl_local_port_range,
 425                 .maxlen         = sizeof(sysctl_local_port_range),
 426                 .mode           = 0644,
 427                 .proc_handler   = &ipv4_local_port_range,
 428                 .strategy       = &ipv4_sysctl_local_port_range,
 429         },
 430         {
 431                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 432                 .procname       = "icmp_echo_ignore_all",
 433                 .data           = &sysctl_icmp_echo_ignore_all,
 434                 .maxlen         = sizeof(int),
 435                 .mode           = 0644,
 436                 .proc_handler   = &proc_dointvec
 437         },
 438         {
 439                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 440                 .procname       = "icmp_echo_ignore_broadcasts",
 441                 .data           = &sysctl_icmp_echo_ignore_broadcasts,
 442                 .maxlen         = sizeof(int),
 443                 .mode           = 0644,
 444                 .proc_handler   = &proc_dointvec
 445         },
 446         {
 447                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 448                 .procname       = "icmp_ignore_bogus_error_responses",
 449                 .data           = &sysctl_icmp_ignore_bogus_error_responses,
 450                 .maxlen         = sizeof(int),
 451                 .mode           = 0644,
 452                 .proc_handler   = &proc_dointvec
 453         },
 454         {
 455                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 456                 .procname       = "icmp_errors_use_inbound_ifaddr",
 457                 .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
 458                 .maxlen         = sizeof(int),
 459                 .mode           = 0644,
 460                 .proc_handler   = &proc_dointvec
 461         },
 462         {
 463                 .ctl_name       = NET_IPV4_ROUTE,
 464                 .procname       = "route",
 465                 .maxlen         = 0,
 466                 .mode           = 0555,
 467                 .child          = ipv4_route_table
 468         },
 469 #ifdef CONFIG_IP_MULTICAST
 470         {
 471                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 472                 .procname       = "igmp_max_memberships",
 473                 .data           = &sysctl_igmp_max_memberships,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = &proc_dointvec
 477         },
 478
 479 #endif
 480         {
 481                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 482                 .procname       = "igmp_max_msf",
 483                 .data           = &sysctl_igmp_max_msf,
 484                 .maxlen         = sizeof(int),
 485                 .mode           = 0644,
 486                 .proc_handler   = &proc_dointvec
 487         },
 488         {
 489                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 490                 .procname       = "inet_peer_threshold",
 491                 .data           = &inet_peer_threshold,
 492                 .maxlen         = sizeof(int),
 493                 .mode           = 0644,
 494                 .proc_handler   = &proc_dointvec
 495         },
 496         {
 497                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 498                 .procname       = "inet_peer_minttl",
 499                 .data           = &inet_peer_minttl,
 500                 .maxlen         = sizeof(int),
 501                 .mode           = 0644,
 502                 .proc_handler   = &proc_dointvec_jiffies,
 503                 .strategy       = &sysctl_jiffies
 504         },
 505         {
 506                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 507                 .procname       = "inet_peer_maxttl",
 508                 .data           = &inet_peer_maxttl,
 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_GC_MINTIME,
 516                 .procname       = "inet_peer_gc_mintime",
 517                 .data           = &inet_peer_gc_mintime,
 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_MAXTIME,
 525                 .procname       = "inet_peer_gc_maxtime",
 526                 .data           = &inet_peer_gc_maxtime,
 527                 .maxlen         = sizeof(int),
 528                 .mode           = 0644,
 529                 .proc_handler   = &proc_dointvec_jiffies,
 530                 .strategy       = &sysctl_jiffies
 531         },
 532         {
 533                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 534                 .procname       = "tcp_orphan_retries",
 535                 .data           = &sysctl_tcp_orphan_retries,
 536                 .maxlen         = sizeof(int),
 537                 .mode           = 0644,
 538                 .proc_handler   = &proc_dointvec
 539         },
 540         {
 541                 .ctl_name       = NET_TCP_FACK,
 542                 .procname       = "tcp_fack",
 543                 .data           = &sysctl_tcp_fack,
 544                 .maxlen         = sizeof(int),
 545                 .mode           = 0644,
 546                 .proc_handler   = &proc_dointvec
 547         },
 548         {
 549                 .ctl_name       = NET_TCP_REORDERING,
 550                 .procname       = "tcp_reordering",
 551                 .data           = &sysctl_tcp_reordering,
 552                 .maxlen         = sizeof(int),
 553                 .mode           = 0644,
 554                 .proc_handler   = &proc_dointvec
 555         },
 556         {
 557                 .ctl_name       = NET_TCP_ECN,
 558                 .procname       = "tcp_ecn",
 559                 .data           = &sysctl_tcp_ecn,
 560                 .maxlen         = sizeof(int),
 561                 .mode           = 0644,
 562                 .proc_handler   = &proc_dointvec
 563         },
 564         {
 565                 .ctl_name       = NET_TCP_DSACK,
 566                 .procname       = "tcp_dsack",
 567                 .data           = &sysctl_tcp_dsack,
 568                 .maxlen         = sizeof(int),
 569                 .mode           = 0644,
 570                 .proc_handler   = &proc_dointvec
 571         },
 572         {
 573                 .ctl_name       = NET_TCP_MEM,
 574                 .procname       = "tcp_mem",
 575                 .data           = &sysctl_tcp_mem,
 576                 .maxlen         = sizeof(sysctl_tcp_mem),
 577                 .mode           = 0644,
 578                 .proc_handler   = &proc_dointvec
 579         },
 580         {
 581                 .ctl_name       = NET_TCP_WMEM,
 582                 .procname       = "tcp_wmem",
 583                 .data           = &sysctl_tcp_wmem,
 584                 .maxlen         = sizeof(sysctl_tcp_wmem),
 585                 .mode           = 0644,
 586                 .proc_handler   = &proc_dointvec
 587         },
 588         {
 589                 .ctl_name       = NET_TCP_RMEM,
 590                 .procname       = "tcp_rmem",
 591                 .data           = &sysctl_tcp_rmem,
 592                 .maxlen         = sizeof(sysctl_tcp_rmem),
 593                 .mode           = 0644,
 594                 .proc_handler   = &proc_dointvec
 595         },
 596         {
 597                 .ctl_name       = NET_TCP_APP_WIN,
 598                 .procname       = "tcp_app_win",
 599                 .data           = &sysctl_tcp_app_win,
 600                 .maxlen         = sizeof(int),
 601                 .mode           = 0644,
 602                 .proc_handler   = &proc_dointvec
 603         },
 604         {
 605                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 606                 .procname       = "tcp_adv_win_scale",
 607                 .data           = &sysctl_tcp_adv_win_scale,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec
 611         },
 612         {
 613                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 614                 .procname       = "icmp_ratelimit",
 615                 .data           = &sysctl_icmp_ratelimit,
 616                 .maxlen         = sizeof(int),
 617                 .mode           = 0644,
 618                 .proc_handler   = &proc_dointvec
 619         },
 620         {
 621                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 622                 .procname       = "icmp_ratemask",
 623                 .data           = &sysctl_icmp_ratemask,
 624                 .maxlen         = sizeof(int),
 625                 .mode           = 0644,
 626                 .proc_handler   = &proc_dointvec
 627         },
 628         {
 629                 .ctl_name       = NET_TCP_TW_REUSE,
 630                 .procname       = "tcp_tw_reuse",
 631                 .data           = &sysctl_tcp_tw_reuse,
 632                 .maxlen         = sizeof(int),
 633                 .mode           = 0644,
 634                 .proc_handler   = &proc_dointvec
 635         },
 636         {
 637                 .ctl_name       = NET_TCP_FRTO,
 638                 .procname       = "tcp_frto",
 639                 .data           = &sysctl_tcp_frto,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = &proc_dointvec
 643         },
 644         {
 645                 .ctl_name       = NET_TCP_FRTO_RESPONSE,
 646                 .procname       = "tcp_frto_response",
 647                 .data           = &sysctl_tcp_frto_response,
 648                 .maxlen         = sizeof(int),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec
 651         },
 652         {
 653                 .ctl_name       = NET_TCP_LOW_LATENCY,
 654                 .procname       = "tcp_low_latency",
 655                 .data           = &sysctl_tcp_low_latency,
 656                 .maxlen         = sizeof(int),
 657                 .mode           = 0644,
 658                 .proc_handler   = &proc_dointvec
 659         },
 660         {
 661                 .ctl_name       = NET_IPV4_IPFRAG_SECRET_INTERVAL,
 662                 .procname       = "ipfrag_secret_interval",
 663                 .data           = &ip4_frags_ctl.secret_interval,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 .proc_handler   = &proc_dointvec_jiffies,
 667                 .strategy       = &sysctl_jiffies
 668         },
 669         {
 670                 .procname       = "ipfrag_max_dist",
 671                 .data           = &sysctl_ipfrag_max_dist,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = &proc_dointvec_minmax,
 675                 .extra1         = &zero
 676         },
 677         {
 678                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 679                 .procname       = "tcp_no_metrics_save",
 680                 .data           = &sysctl_tcp_nometrics_save,
 681                 .maxlen         = sizeof(int),
 682                 .mode           = 0644,
 683                 .proc_handler   = &proc_dointvec,
 684         },
 685         {
 686                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 687                 .procname       = "tcp_moderate_rcvbuf",
 688                 .data           = &sysctl_tcp_moderate_rcvbuf,
 689                 .maxlen         = sizeof(int),
 690                 .mode           = 0644,
 691                 .proc_handler   = &proc_dointvec,
 692         },
 693         {
 694                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 695                 .procname       = "tcp_tso_win_divisor",
 696                 .data           = &sysctl_tcp_tso_win_divisor,
 697                 .maxlen         = sizeof(int),
 698                 .mode           = 0644,
 699                 .proc_handler   = &proc_dointvec,
 700         },
 701         {
 702                 .ctl_name       = NET_TCP_CONG_CONTROL,
 703                 .procname       = "tcp_congestion_control",
 704                 .mode           = 0644,
 705                 .maxlen         = TCP_CA_NAME_MAX,
 706                 .proc_handler   = &proc_tcp_congestion_control,
 707                 .strategy       = &sysctl_tcp_congestion_control,
 708         },
 709         {
 710                 .ctl_name       = NET_TCP_ABC,
 711                 .procname       = "tcp_abc",
 712                 .data           = &sysctl_tcp_abc,
 713                 .maxlen         = sizeof(int),
 714                 .mode           = 0644,
 715                 .proc_handler   = &proc_dointvec,
 716         },
 717         {
 718                 .ctl_name       = NET_TCP_MTU_PROBING,
 719                 .procname       = "tcp_mtu_probing",
 720                 .data           = &sysctl_tcp_mtu_probing,
 721                 .maxlen         = sizeof(int),
 722                 .mode           = 0644,
 723                 .proc_handler   = &proc_dointvec,
 724         },
 725         {
 726                 .ctl_name       = NET_TCP_BASE_MSS,
 727                 .procname       = "tcp_base_mss",
 728                 .data           = &sysctl_tcp_base_mss,
 729                 .maxlen         = sizeof(int),
 730                 .mode           = 0644,
 731                 .proc_handler   = &proc_dointvec,
 732         },
 733         {
 734                 .ctl_name       = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
 735                 .procname       = "tcp_workaround_signed_windows",
 736                 .data           = &sysctl_tcp_workaround_signed_windows,
 737                 .maxlen         = sizeof(int),
 738                 .mode           = 0644,
 739                 .proc_handler   = &proc_dointvec
 740         },
 741 #ifdef CONFIG_NET_DMA
 742         {
 743                 .ctl_name       = NET_TCP_DMA_COPYBREAK,
 744                 .procname       = "tcp_dma_copybreak",
 745                 .data           = &sysctl_tcp_dma_copybreak,
 746                 .maxlen         = sizeof(int),
 747                 .mode           = 0644,
 748                 .proc_handler   = &proc_dointvec
 749         },
 750 #endif
 751         {
 752                 .ctl_name       = NET_TCP_SLOW_START_AFTER_IDLE,
 753                 .procname       = "tcp_slow_start_after_idle",
 754                 .data           = &sysctl_tcp_slow_start_after_idle,
 755                 .maxlen         = sizeof(int),
 756                 .mode           = 0644,
 757                 .proc_handler   = &proc_dointvec
 758         },
 759 #ifdef CONFIG_NETLABEL
 760         {
 761                 .ctl_name       = NET_CIPSOV4_CACHE_ENABLE,
 762                 .procname       = "cipso_cache_enable",
 763                 .data           = &cipso_v4_cache_enabled,
 764                 .maxlen         = sizeof(int),
 765                 .mode           = 0644,
 766                 .proc_handler   = &proc_dointvec,
 767         },
 768         {
 769                 .ctl_name       = NET_CIPSOV4_CACHE_BUCKET_SIZE,
 770                 .procname       = "cipso_cache_bucket_size",
 771                 .data           = &cipso_v4_cache_bucketsize,
 772                 .maxlen         = sizeof(int),
 773                 .mode           = 0644,
 774                 .proc_handler   = &proc_dointvec,
 775         },
 776         {
 777                 .ctl_name       = NET_CIPSOV4_RBM_OPTFMT,
 778                 .procname       = "cipso_rbm_optfmt",
 779                 .data           = &cipso_v4_rbm_optfmt,
 780                 .maxlen         = sizeof(int),
 781                 .mode           = 0644,
 782                 .proc_handler   = &proc_dointvec,
 783         },
 784         {
 785                 .ctl_name       = NET_CIPSOV4_RBM_STRICTVALID,
 786                 .procname       = "cipso_rbm_strictvalid",
 787                 .data           = &cipso_v4_rbm_strictvalid,
 788                 .maxlen         = sizeof(int),
 789                 .mode           = 0644,
 790                 .proc_handler   = &proc_dointvec,
 791         },
 792 #endif /* CONFIG_NETLABEL */
 793         {
 794                 .procname       = "tcp_available_congestion_control",
 795                 .maxlen         = TCP_CA_BUF_MAX,
 796                 .mode           = 0444,
 797                 .proc_handler   = &proc_tcp_available_congestion_control,
 798         },
 799         {
 800                 .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
 801                 .procname       = "tcp_allowed_congestion_control",
 802                 .maxlen         = TCP_CA_BUF_MAX,
 803                 .mode           = 0644,
 804                 .proc_handler   = &proc_allowed_congestion_control,
 805                 .strategy       = &strategy_allowed_congestion_control,
 806         },
 807         {
 808                 .ctl_name       = NET_TCP_MAX_SSTHRESH,
 809                 .procname       = "tcp_max_ssthresh",
 810                 .data           = &sysctl_tcp_max_ssthresh,
 811                 .maxlen         = sizeof(int),
 812                 .mode           = 0644,
 813                 .proc_handler   = &proc_dointvec,
 814         },
 815         { .ctl_name = 0 }
 816 };
 817
 818 static __initdata struct ctl_path net_ipv4_path[] = {
 819         { .procname = "net", .ctl_name = CTL_NET, },
 820         { .procname = "ipv4", .ctl_name = NET_IPV4, },
 821         { },
 822 };
 823
 824 static __init int sysctl_ipv4_init(void)
 825 {
 826         struct ctl_table_header *hdr;
 827
 828         hdr = register_sysctl_paths(net_ipv4_path, ipv4_table);
 829         return hdr == NULL ? -ENOMEM : 0;
 830 }
 831
 832 __initcall(sysctl_ipv4_init);