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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 <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 #include <net/inet_frag.h>
  23
  24 /* From af_inet.c */
  25 extern int sysctl_ip_nonlocal_bind;
  26
  27 #ifdef CONFIG_SYSCTL
  28 static int zero;
  29 static int tcp_retr1_max = 255;
  30 static int ip_local_port_range_min[] = { 1, 1 };
  31 static int ip_local_port_range_max[] = { 65535, 65535 };
  32 #endif
  33
  34 struct ipv4_config ipv4_config;
  35
  36 #ifdef CONFIG_SYSCTL
  37
  38 static
  39 int ipv4_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
  40                         void __user *buffer, size_t *lenp, loff_t *ppos)
  41 {
  42         int val = IPV4_DEVCONF_ALL(FORWARDING);
  43         int ret;
  44
  45         ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
  46
  47         if (write && IPV4_DEVCONF_ALL(FORWARDING) != val)
  48                 inet_forward_change();
  49
  50         return ret;
  51 }
  52
  53 static int ipv4_sysctl_forward_strategy(ctl_table *table,
  54                          int __user *name, int nlen,
  55                          void __user *oldval, size_t __user *oldlenp,
  56                          void __user *newval, size_t newlen)
  57 {
  58         int *valp = table->data;
  59         int new;
  60
  61         if (!newval || !newlen)
  62                 return 0;
  63
  64         if (newlen != sizeof(int))
  65                 return -EINVAL;
  66
  67         if (get_user(new, (int __user *)newval))
  68                 return -EFAULT;
  69
  70         if (new == *valp)
  71                 return 0;
  72
  73         if (oldval && oldlenp) {
  74                 size_t len;
  75
  76                 if (get_user(len, oldlenp))
  77                         return -EFAULT;
  78
  79                 if (len) {
  80                         if (len > table->maxlen)
  81                                 len = table->maxlen;
  82                         if (copy_to_user(oldval, valp, len))
  83                                 return -EFAULT;
  84                         if (put_user(len, oldlenp))
  85                                 return -EFAULT;
  86                 }
  87         }
  88
  89         *valp = new;
  90         inet_forward_change();
  91         return 1;
  92 }
  93
  94 extern seqlock_t sysctl_port_range_lock;
  95 extern int sysctl_local_port_range[2];
  96
  97 /* Update system visible IP port range */
  98 static void set_local_port_range(int range[2])
  99 {
 100         write_seqlock(&sysctl_port_range_lock);
 101         sysctl_local_port_range[0] = range[0];
 102         sysctl_local_port_range[1] = range[1];
 103         write_sequnlock(&sysctl_port_range_lock);
 104 }
 105
 106 /* Validate changes from /proc interface. */
 107 static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
 108                                  void __user *buffer,
 109                                  size_t *lenp, loff_t *ppos)
 110 {
 111         int ret;
 112         int range[2] = { sysctl_local_port_range[0],
 113                          sysctl_local_port_range[1] };
 114         ctl_table tmp = {
 115                 .data = &range,
 116                 .maxlen = sizeof(range),
 117                 .mode = table->mode,
 118                 .extra1 = &ip_local_port_range_min,
 119                 .extra2 = &ip_local_port_range_max,
 120         };
 121
 122         ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
 123
 124         if (write && ret == 0) {
 125                 if (range[1] <= range[0])
 126                         ret = -EINVAL;
 127                 else
 128                         set_local_port_range(range);
 129         }
 130
 131         return ret;
 132 }
 133
 134 /* Validate changes from sysctl interface. */
 135 static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
 136                                          int nlen, void __user *oldval,
 137                                          size_t __user *oldlenp,
 138                                         void __user *newval, size_t newlen)
 139 {
 140         int ret;
 141         int range[2] = { sysctl_local_port_range[0],
 142                          sysctl_local_port_range[1] };
 143         ctl_table tmp = {
 144                 .data = &range,
 145                 .maxlen = sizeof(range),
 146                 .mode = table->mode,
 147                 .extra1 = &ip_local_port_range_min,
 148                 .extra2 = &ip_local_port_range_max,
 149         };
 150
 151         ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
 152         if (ret == 0 && newval && newlen) {
 153                 if (range[1] <= range[0])
 154                         ret = -EINVAL;
 155                 else
 156                         set_local_port_range(range);
 157         }
 158         return ret;
 159 }
 160
 161
 162 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
 163                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 164 {
 165         char val[TCP_CA_NAME_MAX];
 166         ctl_table tbl = {
 167                 .data = val,
 168                 .maxlen = TCP_CA_NAME_MAX,
 169         };
 170         int ret;
 171
 172         tcp_get_default_congestion_control(val);
 173
 174         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 175         if (write && ret == 0)
 176                 ret = tcp_set_default_congestion_control(val);
 177         return ret;
 178 }
 179
 180 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
 181                                          int nlen, void __user *oldval,
 182                                          size_t __user *oldlenp,
 183                                          void __user *newval, size_t newlen)
 184 {
 185         char val[TCP_CA_NAME_MAX];
 186         ctl_table tbl = {
 187                 .data = val,
 188                 .maxlen = TCP_CA_NAME_MAX,
 189         };
 190         int ret;
 191
 192         tcp_get_default_congestion_control(val);
 193         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 194         if (ret == 0 && newval && newlen)
 195                 ret = tcp_set_default_congestion_control(val);
 196         return ret;
 197 }
 198
 199 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 200                                                  int write, struct file * filp,
 201                                                  void __user *buffer, size_t *lenp,
 202                                                  loff_t *ppos)
 203 {
 204         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 205         int ret;
 206
 207         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 208         if (!tbl.data)
 209                 return -ENOMEM;
 210         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 211         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 212         kfree(tbl.data);
 213         return ret;
 214 }
 215
 216 static int proc_allowed_congestion_control(ctl_table *ctl,
 217                                            int write, struct file * filp,
 218                                            void __user *buffer, size_t *lenp,
 219                                            loff_t *ppos)
 220 {
 221         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 222         int ret;
 223
 224         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 225         if (!tbl.data)
 226                 return -ENOMEM;
 227
 228         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 229         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 230         if (write && ret == 0)
 231                 ret = tcp_set_allowed_congestion_control(tbl.data);
 232         kfree(tbl.data);
 233         return ret;
 234 }
 235
 236 static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
 237                                                int nlen, void __user *oldval,
 238                                                size_t __user *oldlenp,
 239                                                void __user *newval,
 240                                                size_t newlen)
 241 {
 242         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 243         int ret;
 244
 245         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 246         if (!tbl.data)
 247                 return -ENOMEM;
 248
 249         tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
 250         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 251         if (ret == 0 && newval && newlen)
 252                 ret = tcp_set_allowed_congestion_control(tbl.data);
 253         kfree(tbl.data);
 254
 255         return ret;
 256
 257 }
 258
 259 ctl_table ipv4_table[] = {
 260         {
 261                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 262                 .procname       = "tcp_timestamps",
 263                 .data           = &sysctl_tcp_timestamps,
 264                 .maxlen         = sizeof(int),
 265                 .mode           = 0644,
 266                 .proc_handler   = &proc_dointvec
 267         },
 268         {
 269                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 270                 .procname       = "tcp_window_scaling",
 271                 .data           = &sysctl_tcp_window_scaling,
 272                 .maxlen         = sizeof(int),
 273                 .mode           = 0644,
 274                 .proc_handler   = &proc_dointvec
 275         },
 276         {
 277                 .ctl_name       = NET_IPV4_TCP_SACK,
 278                 .procname       = "tcp_sack",
 279                 .data           = &sysctl_tcp_sack,
 280                 .maxlen         = sizeof(int),
 281                 .mode           = 0644,
 282                 .proc_handler   = &proc_dointvec
 283         },
 284         {
 285                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 286                 .procname       = "tcp_retrans_collapse",
 287                 .data           = &sysctl_tcp_retrans_collapse,
 288                 .maxlen         = sizeof(int),
 289                 .mode           = 0644,
 290                 .proc_handler   = &proc_dointvec
 291         },
 292         {
 293                 .ctl_name       = NET_IPV4_FORWARD,
 294                 .procname       = "ip_forward",
 295                 .data           = &IPV4_DEVCONF_ALL(FORWARDING),
 296                 .maxlen         = sizeof(int),
 297                 .mode           = 0644,
 298                 .proc_handler   = &ipv4_sysctl_forward,
 299                 .strategy       = &ipv4_sysctl_forward_strategy
 300         },
 301         {
 302                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 303                 .procname       = "ip_default_ttl",
 304                 .data           = &sysctl_ip_default_ttl,
 305                 .maxlen         = sizeof(int),
 306                 .mode           = 0644,
 307                 .proc_handler   = &ipv4_doint_and_flush,
 308                 .strategy       = &ipv4_doint_and_flush_strategy,
 309         },
 310         {
 311                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 312                 .procname       = "ip_no_pmtu_disc",
 313                 .data           = &ipv4_config.no_pmtu_disc,
 314                 .maxlen         = sizeof(int),
 315                 .mode           = 0644,
 316                 .proc_handler   = &proc_dointvec
 317         },
 318         {
 319                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 320                 .procname       = "ip_nonlocal_bind",
 321                 .data           = &sysctl_ip_nonlocal_bind,
 322                 .maxlen         = sizeof(int),
 323                 .mode           = 0644,
 324                 .proc_handler   = &proc_dointvec
 325         },
 326         {
 327                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 328                 .procname       = "tcp_syn_retries",
 329                 .data           = &sysctl_tcp_syn_retries,
 330                 .maxlen         = sizeof(int),
 331                 .mode           = 0644,
 332                 .proc_handler   = &proc_dointvec
 333         },
 334         {
 335                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 336                 .procname       = "tcp_synack_retries",
 337                 .data           = &sysctl_tcp_synack_retries,
 338                 .maxlen         = sizeof(int),
 339                 .mode           = 0644,
 340                 .proc_handler   = &proc_dointvec
 341         },
 342         {
 343                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 344                 .procname       = "tcp_max_orphans",
 345                 .data           = &sysctl_tcp_max_orphans,
 346                 .maxlen         = sizeof(int),
 347                 .mode           = 0644,
 348                 .proc_handler   = &proc_dointvec
 349         },
 350         {
 351                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 352                 .procname       = "tcp_max_tw_buckets",
 353                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 354                 .maxlen         = sizeof(int),
 355                 .mode           = 0644,
 356                 .proc_handler   = &proc_dointvec
 357         },
 358         {
 359                 .ctl_name       = NET_IPV4_IPFRAG_HIGH_THRESH,
 360                 .procname       = "ipfrag_high_thresh",
 361                 .data           = &ip4_frags_ctl.high_thresh,
 362                 .maxlen         = sizeof(int),
 363                 .mode           = 0644,
 364                 .proc_handler   = &proc_dointvec
 365         },
 366         {
 367                 .ctl_name       = NET_IPV4_IPFRAG_LOW_THRESH,
 368                 .procname       = "ipfrag_low_thresh",
 369                 .data           = &ip4_frags_ctl.low_thresh,
 370                 .maxlen         = sizeof(int),
 371                 .mode           = 0644,
 372                 .proc_handler   = &proc_dointvec
 373         },
 374         {
 375                 .ctl_name       = NET_IPV4_DYNADDR,
 376                 .procname       = "ip_dynaddr",
 377                 .data           = &sysctl_ip_dynaddr,
 378                 .maxlen         = sizeof(int),
 379                 .mode           = 0644,
 380                 .proc_handler   = &proc_dointvec
 381         },
 382         {
 383                 .ctl_name       = NET_IPV4_IPFRAG_TIME,
 384                 .procname       = "ipfrag_time",
 385                 .data           = &ip4_frags_ctl.timeout,
 386                 .maxlen         = sizeof(int),
 387                 .mode           = 0644,
 388                 .proc_handler   = &proc_dointvec_jiffies,
 389                 .strategy       = &sysctl_jiffies
 390         },
 391         {
 392                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 393                 .procname       = "tcp_keepalive_time",
 394                 .data           = &sysctl_tcp_keepalive_time,
 395                 .maxlen         = sizeof(int),
 396                 .mode           = 0644,
 397                 .proc_handler   = &proc_dointvec_jiffies,
 398                 .strategy       = &sysctl_jiffies
 399         },
 400         {
 401                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 402                 .procname       = "tcp_keepalive_probes",
 403                 .data           = &sysctl_tcp_keepalive_probes,
 404                 .maxlen         = sizeof(int),
 405                 .mode           = 0644,
 406                 .proc_handler   = &proc_dointvec
 407         },
 408         {
 409                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 410                 .procname       = "tcp_keepalive_intvl",
 411                 .data           = &sysctl_tcp_keepalive_intvl,
 412                 .maxlen         = sizeof(int),
 413                 .mode           = 0644,
 414                 .proc_handler   = &proc_dointvec_jiffies,
 415                 .strategy       = &sysctl_jiffies
 416         },
 417         {
 418                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 419                 .procname       = "tcp_retries1",
 420                 .data           = &sysctl_tcp_retries1,
 421                 .maxlen         = sizeof(int),
 422                 .mode           = 0644,
 423                 .proc_handler   = &proc_dointvec_minmax,
 424                 .strategy       = &sysctl_intvec,
 425                 .extra2         = &tcp_retr1_max
 426         },
 427         {
 428                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 429                 .procname       = "tcp_retries2",
 430                 .data           = &sysctl_tcp_retries2,
 431                 .maxlen         = sizeof(int),
 432                 .mode           = 0644,
 433                 .proc_handler   = &proc_dointvec
 434         },
 435         {
 436                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 437                 .procname       = "tcp_fin_timeout",
 438                 .data           = &sysctl_tcp_fin_timeout,
 439                 .maxlen         = sizeof(int),
 440                 .mode           = 0644,
 441                 .proc_handler   = &proc_dointvec_jiffies,
 442                 .strategy       = &sysctl_jiffies
 443         },
 444 #ifdef CONFIG_SYN_COOKIES
 445         {
 446                 .ctl_name       = NET_TCP_SYNCOOKIES,
 447                 .procname       = "tcp_syncookies",
 448                 .data           = &sysctl_tcp_syncookies,
 449                 .maxlen         = sizeof(int),
 450                 .mode           = 0644,
 451                 .proc_handler   = &proc_dointvec
 452         },
 453 #endif
 454         {
 455                 .ctl_name       = NET_TCP_TW_RECYCLE,
 456                 .procname       = "tcp_tw_recycle",
 457                 .data           = &tcp_death_row.sysctl_tw_recycle,
 458                 .maxlen         = sizeof(int),
 459                 .mode           = 0644,
 460                 .proc_handler   = &proc_dointvec
 461         },
 462         {
 463                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 464                 .procname       = "tcp_abort_on_overflow",
 465                 .data           = &sysctl_tcp_abort_on_overflow,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = &proc_dointvec
 469         },
 470         {
 471                 .ctl_name       = NET_TCP_STDURG,
 472                 .procname       = "tcp_stdurg",
 473                 .data           = &sysctl_tcp_stdurg,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = &proc_dointvec
 477         },
 478         {
 479                 .ctl_name       = NET_TCP_RFC1337,
 480                 .procname       = "tcp_rfc1337",
 481                 .data           = &sysctl_tcp_rfc1337,
 482                 .maxlen         = sizeof(int),
 483                 .mode           = 0644,
 484                 .proc_handler   = &proc_dointvec
 485         },
 486         {
 487                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 488                 .procname       = "tcp_max_syn_backlog",
 489                 .data           = &sysctl_max_syn_backlog,
 490                 .maxlen         = sizeof(int),
 491                 .mode           = 0644,
 492                 .proc_handler   = &proc_dointvec
 493         },
 494         {
 495                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 496                 .procname       = "ip_local_port_range",
 497                 .data           = &sysctl_local_port_range,
 498                 .maxlen         = sizeof(sysctl_local_port_range),
 499                 .mode           = 0644,
 500                 .proc_handler   = &ipv4_local_port_range,
 501                 .strategy       = &ipv4_sysctl_local_port_range,
 502         },
 503         {
 504                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 505                 .procname       = "icmp_echo_ignore_all",
 506                 .data           = &sysctl_icmp_echo_ignore_all,
 507                 .maxlen         = sizeof(int),
 508                 .mode           = 0644,
 509                 .proc_handler   = &proc_dointvec
 510         },
 511         {
 512                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 513                 .procname       = "icmp_echo_ignore_broadcasts",
 514                 .data           = &sysctl_icmp_echo_ignore_broadcasts,
 515                 .maxlen         = sizeof(int),
 516                 .mode           = 0644,
 517                 .proc_handler   = &proc_dointvec
 518         },
 519         {
 520                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 521                 .procname       = "icmp_ignore_bogus_error_responses",
 522                 .data           = &sysctl_icmp_ignore_bogus_error_responses,
 523                 .maxlen         = sizeof(int),
 524                 .mode           = 0644,
 525                 .proc_handler   = &proc_dointvec
 526         },
 527         {
 528                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 529                 .procname       = "icmp_errors_use_inbound_ifaddr",
 530                 .data           = &sysctl_icmp_errors_use_inbound_ifaddr,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = &proc_dointvec
 534         },
 535         {
 536                 .ctl_name       = NET_IPV4_ROUTE,
 537                 .procname       = "route",
 538                 .maxlen         = 0,
 539                 .mode           = 0555,
 540                 .child          = ipv4_route_table
 541         },
 542 #ifdef CONFIG_IP_MULTICAST
 543         {
 544                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 545                 .procname       = "igmp_max_memberships",
 546                 .data           = &sysctl_igmp_max_memberships,
 547                 .maxlen         = sizeof(int),
 548                 .mode           = 0644,
 549                 .proc_handler   = &proc_dointvec
 550         },
 551
 552 #endif
 553         {
 554                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 555                 .procname       = "igmp_max_msf",
 556                 .data           = &sysctl_igmp_max_msf,
 557                 .maxlen         = sizeof(int),
 558                 .mode           = 0644,
 559                 .proc_handler   = &proc_dointvec
 560         },
 561         {
 562                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 563                 .procname       = "inet_peer_threshold",
 564                 .data           = &inet_peer_threshold,
 565                 .maxlen         = sizeof(int),
 566                 .mode           = 0644,
 567                 .proc_handler   = &proc_dointvec
 568         },
 569         {
 570                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 571                 .procname       = "inet_peer_minttl",
 572                 .data           = &inet_peer_minttl,
 573                 .maxlen         = sizeof(int),
 574                 .mode           = 0644,
 575                 .proc_handler   = &proc_dointvec_jiffies,
 576                 .strategy       = &sysctl_jiffies
 577         },
 578         {
 579                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 580                 .procname       = "inet_peer_maxttl",
 581                 .data           = &inet_peer_maxttl,
 582                 .maxlen         = sizeof(int),
 583                 .mode           = 0644,
 584                 .proc_handler   = &proc_dointvec_jiffies,
 585                 .strategy       = &sysctl_jiffies
 586         },
 587         {
 588                 .ctl_name       = NET_IPV4_INET_PEER_GC_MINTIME,
 589                 .procname       = "inet_peer_gc_mintime",
 590                 .data           = &inet_peer_gc_mintime,
 591                 .maxlen         = sizeof(int),
 592                 .mode           = 0644,
 593                 .proc_handler   = &proc_dointvec_jiffies,
 594                 .strategy       = &sysctl_jiffies
 595         },
 596         {
 597                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 598                 .procname       = "inet_peer_gc_maxtime",
 599                 .data           = &inet_peer_gc_maxtime,
 600                 .maxlen         = sizeof(int),
 601                 .mode           = 0644,
 602                 .proc_handler   = &proc_dointvec_jiffies,
 603                 .strategy       = &sysctl_jiffies
 604         },
 605         {
 606                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 607                 .procname       = "tcp_orphan_retries",
 608                 .data           = &sysctl_tcp_orphan_retries,
 609                 .maxlen         = sizeof(int),
 610                 .mode           = 0644,
 611                 .proc_handler   = &proc_dointvec
 612         },
 613         {
 614                 .ctl_name       = NET_TCP_FACK,
 615                 .procname       = "tcp_fack",
 616                 .data           = &sysctl_tcp_fack,
 617                 .maxlen         = sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = &proc_dointvec
 620         },
 621         {
 622                 .ctl_name       = NET_TCP_REORDERING,
 623                 .procname       = "tcp_reordering",
 624                 .data           = &sysctl_tcp_reordering,
 625                 .maxlen         = sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = &proc_dointvec
 628         },
 629         {
 630                 .ctl_name       = NET_TCP_ECN,
 631                 .procname       = "tcp_ecn",
 632                 .data           = &sysctl_tcp_ecn,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = &proc_dointvec
 636         },
 637         {
 638                 .ctl_name       = NET_TCP_DSACK,
 639                 .procname       = "tcp_dsack",
 640                 .data           = &sysctl_tcp_dsack,
 641                 .maxlen         = sizeof(int),
 642                 .mode           = 0644,
 643                 .proc_handler   = &proc_dointvec
 644         },
 645         {
 646                 .ctl_name       = NET_TCP_MEM,
 647                 .procname       = "tcp_mem",
 648                 .data           = &sysctl_tcp_mem,
 649                 .maxlen         = sizeof(sysctl_tcp_mem),
 650                 .mode           = 0644,
 651                 .proc_handler   = &proc_dointvec
 652         },
 653         {
 654                 .ctl_name       = NET_TCP_WMEM,
 655                 .procname       = "tcp_wmem",
 656                 .data           = &sysctl_tcp_wmem,
 657                 .maxlen         = sizeof(sysctl_tcp_wmem),
 658                 .mode           = 0644,
 659                 .proc_handler   = &proc_dointvec
 660         },
 661         {
 662                 .ctl_name       = NET_TCP_RMEM,
 663                 .procname       = "tcp_rmem",
 664                 .data           = &sysctl_tcp_rmem,
 665                 .maxlen         = sizeof(sysctl_tcp_rmem),
 666                 .mode           = 0644,
 667                 .proc_handler   = &proc_dointvec
 668         },
 669         {
 670                 .ctl_name       = NET_TCP_APP_WIN,
 671                 .procname       = "tcp_app_win",
 672                 .data           = &sysctl_tcp_app_win,
 673                 .maxlen         = sizeof(int),
 674                 .mode           = 0644,
 675                 .proc_handler   = &proc_dointvec
 676         },
 677         {
 678                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 679                 .procname       = "tcp_adv_win_scale",
 680                 .data           = &sysctl_tcp_adv_win_scale,
 681                 .maxlen         = sizeof(int),
 682                 .mode           = 0644,
 683                 .proc_handler   = &proc_dointvec
 684         },
 685         {
 686                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 687                 .procname       = "icmp_ratelimit",
 688                 .data           = &sysctl_icmp_ratelimit,
 689                 .maxlen         = sizeof(int),
 690                 .mode           = 0644,
 691                 .proc_handler   = &proc_dointvec
 692         },
 693         {
 694                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 695                 .procname       = "icmp_ratemask",
 696                 .data           = &sysctl_icmp_ratemask,
 697                 .maxlen         = sizeof(int),
 698                 .mode           = 0644,
 699                 .proc_handler   = &proc_dointvec
 700         },
 701         {
 702                 .ctl_name       = NET_TCP_TW_REUSE,
 703                 .procname       = "tcp_tw_reuse",
 704                 .data           = &sysctl_tcp_tw_reuse,
 705                 .maxlen         = sizeof(int),
 706                 .mode           = 0644,
 707                 .proc_handler   = &proc_dointvec
 708         },
 709         {
 710                 .ctl_name       = NET_TCP_FRTO,
 711                 .procname       = "tcp_frto",
 712                 .data           = &sysctl_tcp_frto,
 713                 .maxlen         = sizeof(int),
 714                 .mode           = 0644,
 715                 .proc_handler   = &proc_dointvec
 716         },
 717         {
 718                 .ctl_name       = NET_TCP_FRTO_RESPONSE,
 719                 .procname       = "tcp_frto_response",
 720                 .data           = &sysctl_tcp_frto_response,
 721                 .maxlen         = sizeof(int),
 722                 .mode           = 0644,
 723                 .proc_handler   = &proc_dointvec
 724         },
 725         {
 726                 .ctl_name       = NET_TCP_LOW_LATENCY,
 727                 .procname       = "tcp_low_latency",
 728                 .data           = &sysctl_tcp_low_latency,
 729                 .maxlen         = sizeof(int),
 730                 .mode           = 0644,
 731                 .proc_handler   = &proc_dointvec
 732         },
 733         {
 734                 .ctl_name       = NET_IPV4_IPFRAG_SECRET_INTERVAL,
 735                 .procname       = "ipfrag_secret_interval",
 736                 .data           = &ip4_frags_ctl.secret_interval,
 737                 .maxlen         = sizeof(int),
 738                 .mode           = 0644,
 739                 .proc_handler   = &proc_dointvec_jiffies,
 740                 .strategy       = &sysctl_jiffies
 741         },
 742         {
 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                 .procname       = "tcp_available_congestion_control",
 868                 .maxlen         = TCP_CA_BUF_MAX,
 869                 .mode           = 0444,
 870                 .proc_handler   = &proc_tcp_available_congestion_control,
 871         },
 872         {
 873                 .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
 874                 .procname       = "tcp_allowed_congestion_control",
 875                 .maxlen         = TCP_CA_BUF_MAX,
 876                 .mode           = 0644,
 877                 .proc_handler   = &proc_allowed_congestion_control,
 878                 .strategy       = &strategy_allowed_congestion_control,
 879         },
 880         {
 881                 .ctl_name       = NET_TCP_MAX_SSTHRESH,
 882                 .procname       = "tcp_max_ssthresh",
 883                 .data           = &sysctl_tcp_max_ssthresh,
 884                 .maxlen         = sizeof(int),
 885                 .mode           = 0644,
 886                 .proc_handler   = &proc_dointvec,
 887         },
 888         { .ctl_name = 0 }
 889 };
 890
 891 #endif /* CONFIG_SYSCTL */
 892
 893 EXPORT_SYMBOL(ipv4_config);