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   1 /*
   2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   3  *
   4  * Begun April 1, 1996, Mike Shaver.
   5  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   6  */
   7
   8 #include <linux/mm.h>
   9 #include <linux/module.h>
  10 #include <linux/sysctl.h>
  11 #include <linux/igmp.h>
  12 #include <linux/inetdevice.h>
  13 #include <linux/seqlock.h>
  14 #include <linux/init.h>
  15 #include <net/snmp.h>
  16 #include <net/icmp.h>
  17 #include <net/ip.h>
  18 #include <net/route.h>
  19 #include <net/tcp.h>
  20 #include <net/udp.h>
  21 #include <net/cipso_ipv4.h>
  22 #include <net/inet_frag.h>
  23
  24 static int zero;
  25 static int tcp_retr1_max = 255;
  26 static int ip_local_port_range_min[] = { 1, 1 };
  27 static int ip_local_port_range_max[] = { 65535, 65535 };
  28
  29 /* Update system visible IP port range */
  30 static void set_local_port_range(int range[2])
  31 {
  32         write_seqlock(&sysctl_local_ports.lock);
  33         sysctl_local_ports.range[0] = range[0];
  34         sysctl_local_ports.range[1] = range[1];
  35         write_sequnlock(&sysctl_local_ports.lock);
  36 }
  37
  38 /* Validate changes from /proc interface. */
  39 static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
  40                                  void __user *buffer,
  41                                  size_t *lenp, loff_t *ppos)
  42 {
  43         int ret;
  44         int range[2];
  45         ctl_table tmp = {
  46                 .data = &range,
  47                 .maxlen = sizeof(range),
  48                 .mode = table->mode,
  49                 .extra1 = &ip_local_port_range_min,
  50                 .extra2 = &ip_local_port_range_max,
  51         };
  52
  53         inet_get_local_port_range(range, range + 1);
  54         ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
  55
  56         if (write && ret == 0) {
  57                 if (range[1] < range[0])
  58                         ret = -EINVAL;
  59                 else
  60                         set_local_port_range(range);
  61         }
  62
  63         return ret;
  64 }
  65
  66 /* Validate changes from sysctl interface. */
  67 static int ipv4_sysctl_local_port_range(ctl_table *table,
  68                                          void __user *oldval,
  69                                          size_t __user *oldlenp,
  70                                         void __user *newval, size_t newlen)
  71 {
  72         int ret;
  73         int range[2];
  74         ctl_table tmp = {
  75                 .data = &range,
  76                 .maxlen = sizeof(range),
  77                 .mode = table->mode,
  78                 .extra1 = &ip_local_port_range_min,
  79                 .extra2 = &ip_local_port_range_max,
  80         };
  81
  82         inet_get_local_port_range(range, range + 1);
  83         ret = sysctl_intvec(&tmp, oldval, oldlenp, newval, newlen);
  84         if (ret == 0 && newval && newlen) {
  85                 if (range[1] < range[0])
  86                         ret = -EINVAL;
  87                 else
  88                         set_local_port_range(range);
  89         }
  90         return ret;
  91 }
  92
  93
  94 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
  95                                        void __user *buffer, size_t *lenp, loff_t *ppos)
  96 {
  97         char val[TCP_CA_NAME_MAX];
  98         ctl_table tbl = {
  99                 .data = val,
 100                 .maxlen = TCP_CA_NAME_MAX,
 101         };
 102         int ret;
 103
 104         tcp_get_default_congestion_control(val);
 105
 106         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 107         if (write && ret == 0)
 108                 ret = tcp_set_default_congestion_control(val);
 109         return ret;
 110 }
 111
 112 static int sysctl_tcp_congestion_control(ctl_table *table,
 113                                          void __user *oldval,
 114                                          size_t __user *oldlenp,
 115                                          void __user *newval, size_t newlen)
 116 {
 117         char val[TCP_CA_NAME_MAX];
 118         ctl_table tbl = {
 119                 .data = val,
 120                 .maxlen = TCP_CA_NAME_MAX,
 121         };
 122         int ret;
 123
 124         tcp_get_default_congestion_control(val);
 125         ret = sysctl_string(&tbl, oldval, oldlenp, newval, newlen);
 126         if (ret == 1 && newval && newlen)
 127                 ret = tcp_set_default_congestion_control(val);
 128         return ret;
 129 }
 130
 131 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 132                                                  int write, struct file * filp,
 133                                                  void __user *buffer, size_t *lenp,
 134                                                  loff_t *ppos)
 135 {
 136         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 137         int ret;
 138
 139         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 140         if (!tbl.data)
 141                 return -ENOMEM;
 142         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 143         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 144         kfree(tbl.data);
 145         return ret;
 146 }
 147
 148 static int proc_allowed_congestion_control(ctl_table *ctl,
 149                                            int write, struct file * filp,
 150                                            void __user *buffer, size_t *lenp,
 151                                            loff_t *ppos)
 152 {
 153         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 154         int ret;
 155
 156         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 157         if (!tbl.data)
 158                 return -ENOMEM;
 159
 160         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 161         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 162         if (write && ret == 0)
 163                 ret = tcp_set_allowed_congestion_control(tbl.data);
 164         kfree(tbl.data);
 165         return ret;
 166 }
 167
 168 static int strategy_allowed_congestion_control(ctl_table *table,
 169                                                void __user *oldval,
 170                                                size_t __user *oldlenp,
 171                                                void __user *newval,
 172                                                size_t newlen)
 173 {
 174         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 175         int ret;
 176
 177         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 178         if (!tbl.data)
 179                 return -ENOMEM;
 180
 181         tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
 182         ret = sysctl_string(&tbl, oldval, oldlenp, newval, newlen);
 183         if (ret == 1 && newval && newlen)
 184                 ret = tcp_set_allowed_congestion_control(tbl.data);
 185         kfree(tbl.data);
 186
 187         return ret;
 188
 189 }
 190
 191 static struct ctl_table ipv4_table[] = {
 192         {
 193                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 194                 .procname       = "tcp_timestamps",
 195                 .data           = &sysctl_tcp_timestamps,
 196                 .maxlen         = sizeof(int),
 197                 .mode           = 0644,
 198                 .proc_handler   = &proc_dointvec
 199         },
 200         {
 201                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 202                 .procname       = "tcp_window_scaling",
 203                 .data           = &sysctl_tcp_window_scaling,
 204                 .maxlen         = sizeof(int),
 205                 .mode           = 0644,
 206                 .proc_handler   = &proc_dointvec
 207         },
 208         {
 209                 .ctl_name       = NET_IPV4_TCP_SACK,
 210                 .procname       = "tcp_sack",
 211                 .data           = &sysctl_tcp_sack,
 212                 .maxlen         = sizeof(int),
 213                 .mode           = 0644,
 214                 .proc_handler   = &proc_dointvec
 215         },
 216         {
 217                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 218                 .procname       = "tcp_retrans_collapse",
 219                 .data           = &sysctl_tcp_retrans_collapse,
 220                 .maxlen         = sizeof(int),
 221                 .mode           = 0644,
 222                 .proc_handler   = &proc_dointvec
 223         },
 224         {
 225                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 226                 .procname       = "ip_default_ttl",
 227                 .data           = &sysctl_ip_default_ttl,
 228                 .maxlen         = sizeof(int),
 229                 .mode           = 0644,
 230                 .proc_handler   = &ipv4_doint_and_flush,
 231                 .strategy       = &ipv4_doint_and_flush_strategy,
 232                 .extra2         = &init_net,
 233         },
 234         {
 235                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 236                 .procname       = "ip_no_pmtu_disc",
 237                 .data           = &ipv4_config.no_pmtu_disc,
 238                 .maxlen         = sizeof(int),
 239                 .mode           = 0644,
 240                 .proc_handler   = &proc_dointvec
 241         },
 242         {
 243                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 244                 .procname       = "ip_nonlocal_bind",
 245                 .data           = &sysctl_ip_nonlocal_bind,
 246                 .maxlen         = sizeof(int),
 247                 .mode           = 0644,
 248                 .proc_handler   = &proc_dointvec
 249         },
 250         {
 251                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 252                 .procname       = "tcp_syn_retries",
 253                 .data           = &sysctl_tcp_syn_retries,
 254                 .maxlen         = sizeof(int),
 255                 .mode           = 0644,
 256                 .proc_handler   = &proc_dointvec
 257         },
 258         {
 259                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 260                 .procname       = "tcp_synack_retries",
 261                 .data           = &sysctl_tcp_synack_retries,
 262                 .maxlen         = sizeof(int),
 263                 .mode           = 0644,
 264                 .proc_handler   = &proc_dointvec
 265         },
 266         {
 267                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 268                 .procname       = "tcp_max_orphans",
 269                 .data           = &sysctl_tcp_max_orphans,
 270                 .maxlen         = sizeof(int),
 271                 .mode           = 0644,
 272                 .proc_handler   = &proc_dointvec
 273         },
 274         {
 275                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 276                 .procname       = "tcp_max_tw_buckets",
 277                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 278                 .maxlen         = sizeof(int),
 279                 .mode           = 0644,
 280                 .proc_handler   = &proc_dointvec
 281         },
 282         {
 283                 .ctl_name       = NET_IPV4_DYNADDR,
 284                 .procname       = "ip_dynaddr",
 285                 .data           = &sysctl_ip_dynaddr,
 286                 .maxlen         = sizeof(int),
 287                 .mode           = 0644,
 288                 .proc_handler   = &proc_dointvec
 289         },
 290         {
 291                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 292                 .procname       = "tcp_keepalive_time",
 293                 .data           = &sysctl_tcp_keepalive_time,
 294                 .maxlen         = sizeof(int),
 295                 .mode           = 0644,
 296                 .proc_handler   = &proc_dointvec_jiffies,
 297                 .strategy       = &sysctl_jiffies
 298         },
 299         {
 300                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 301                 .procname       = "tcp_keepalive_probes",
 302                 .data           = &sysctl_tcp_keepalive_probes,
 303                 .maxlen         = sizeof(int),
 304                 .mode           = 0644,
 305                 .proc_handler   = &proc_dointvec
 306         },
 307         {
 308                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 309                 .procname       = "tcp_keepalive_intvl",
 310                 .data           = &sysctl_tcp_keepalive_intvl,
 311                 .maxlen         = sizeof(int),
 312                 .mode           = 0644,
 313                 .proc_handler   = &proc_dointvec_jiffies,
 314                 .strategy       = &sysctl_jiffies
 315         },
 316         {
 317                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 318                 .procname       = "tcp_retries1",
 319                 .data           = &sysctl_tcp_retries1,
 320                 .maxlen         = sizeof(int),
 321                 .mode           = 0644,
 322                 .proc_handler   = &proc_dointvec_minmax,
 323                 .strategy       = &sysctl_intvec,
 324                 .extra2         = &tcp_retr1_max
 325         },
 326         {
 327                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 328                 .procname       = "tcp_retries2",
 329                 .data           = &sysctl_tcp_retries2,
 330                 .maxlen         = sizeof(int),
 331                 .mode           = 0644,
 332                 .proc_handler   = &proc_dointvec
 333         },
 334         {
 335                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 336                 .procname       = "tcp_fin_timeout",
 337                 .data           = &sysctl_tcp_fin_timeout,
 338                 .maxlen         = sizeof(int),
 339                 .mode           = 0644,
 340                 .proc_handler   = &proc_dointvec_jiffies,
 341                 .strategy       = &sysctl_jiffies
 342         },
 343 #ifdef CONFIG_SYN_COOKIES
 344         {
 345                 .ctl_name       = NET_TCP_SYNCOOKIES,
 346                 .procname       = "tcp_syncookies",
 347                 .data           = &sysctl_tcp_syncookies,
 348                 .maxlen         = sizeof(int),
 349                 .mode           = 0644,
 350                 .proc_handler   = &proc_dointvec
 351         },
 352 #endif
 353         {
 354                 .ctl_name       = NET_TCP_TW_RECYCLE,
 355                 .procname       = "tcp_tw_recycle",
 356                 .data           = &tcp_death_row.sysctl_tw_recycle,
 357                 .maxlen         = sizeof(int),
 358                 .mode           = 0644,
 359                 .proc_handler   = &proc_dointvec
 360         },
 361         {
 362                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 363                 .procname       = "tcp_abort_on_overflow",
 364                 .data           = &sysctl_tcp_abort_on_overflow,
 365                 .maxlen         = sizeof(int),
 366                 .mode           = 0644,
 367                 .proc_handler   = &proc_dointvec
 368         },
 369         {
 370                 .ctl_name       = NET_TCP_STDURG,
 371                 .procname       = "tcp_stdurg",
 372                 .data           = &sysctl_tcp_stdurg,
 373                 .maxlen         = sizeof(int),
 374                 .mode           = 0644,
 375                 .proc_handler   = &proc_dointvec
 376         },
 377         {
 378                 .ctl_name       = NET_TCP_RFC1337,
 379                 .procname       = "tcp_rfc1337",
 380                 .data           = &sysctl_tcp_rfc1337,
 381                 .maxlen         = sizeof(int),
 382                 .mode           = 0644,
 383                 .proc_handler   = &proc_dointvec
 384         },
 385         {
 386                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 387                 .procname       = "tcp_max_syn_backlog",
 388                 .data           = &sysctl_max_syn_backlog,
 389                 .maxlen         = sizeof(int),
 390                 .mode           = 0644,
 391                 .proc_handler   = &proc_dointvec
 392         },
 393         {
 394                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 395                 .procname       = "ip_local_port_range",
 396                 .data           = &sysctl_local_ports.range,
 397                 .maxlen         = sizeof(sysctl_local_ports.range),
 398                 .mode           = 0644,
 399                 .proc_handler   = &ipv4_local_port_range,
 400                 .strategy       = &ipv4_sysctl_local_port_range,
 401         },
 402 #ifdef CONFIG_IP_MULTICAST
 403         {
 404                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 405                 .procname       = "igmp_max_memberships",
 406                 .data           = &sysctl_igmp_max_memberships,
 407                 .maxlen         = sizeof(int),
 408                 .mode           = 0644,
 409                 .proc_handler   = &proc_dointvec
 410         },
 411
 412 #endif
 413         {
 414                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 415                 .procname       = "igmp_max_msf",
 416                 .data           = &sysctl_igmp_max_msf,
 417                 .maxlen         = sizeof(int),
 418                 .mode           = 0644,
 419                 .proc_handler   = &proc_dointvec
 420         },
 421         {
 422                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 423                 .procname       = "inet_peer_threshold",
 424                 .data           = &inet_peer_threshold,
 425                 .maxlen         = sizeof(int),
 426                 .mode           = 0644,
 427                 .proc_handler   = &proc_dointvec
 428         },
 429         {
 430                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 431                 .procname       = "inet_peer_minttl",
 432                 .data           = &inet_peer_minttl,
 433                 .maxlen         = sizeof(int),
 434                 .mode           = 0644,
 435                 .proc_handler   = &proc_dointvec_jiffies,
 436                 .strategy       = &sysctl_jiffies
 437         },
 438         {
 439                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 440                 .procname       = "inet_peer_maxttl",
 441                 .data           = &inet_peer_maxttl,
 442                 .maxlen         = sizeof(int),
 443                 .mode           = 0644,
 444                 .proc_handler   = &proc_dointvec_jiffies,
 445                 .strategy       = &sysctl_jiffies
 446         },
 447         {
 448                 .ctl_name       = NET_IPV4_INET_PEER_GC_MINTIME,
 449                 .procname       = "inet_peer_gc_mintime",
 450                 .data           = &inet_peer_gc_mintime,
 451                 .maxlen         = sizeof(int),
 452                 .mode           = 0644,
 453                 .proc_handler   = &proc_dointvec_jiffies,
 454                 .strategy       = &sysctl_jiffies
 455         },
 456         {
 457                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 458                 .procname       = "inet_peer_gc_maxtime",
 459                 .data           = &inet_peer_gc_maxtime,
 460                 .maxlen         = sizeof(int),
 461                 .mode           = 0644,
 462                 .proc_handler   = &proc_dointvec_jiffies,
 463                 .strategy       = &sysctl_jiffies
 464         },
 465         {
 466                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 467                 .procname       = "tcp_orphan_retries",
 468                 .data           = &sysctl_tcp_orphan_retries,
 469                 .maxlen         = sizeof(int),
 470                 .mode           = 0644,
 471                 .proc_handler   = &proc_dointvec
 472         },
 473         {
 474                 .ctl_name       = NET_TCP_FACK,
 475                 .procname       = "tcp_fack",
 476                 .data           = &sysctl_tcp_fack,
 477                 .maxlen         = sizeof(int),
 478                 .mode           = 0644,
 479                 .proc_handler   = &proc_dointvec
 480         },
 481         {
 482                 .ctl_name       = NET_TCP_REORDERING,
 483                 .procname       = "tcp_reordering",
 484                 .data           = &sysctl_tcp_reordering,
 485                 .maxlen         = sizeof(int),
 486                 .mode           = 0644,
 487                 .proc_handler   = &proc_dointvec
 488         },
 489         {
 490                 .ctl_name       = NET_TCP_ECN,
 491                 .procname       = "tcp_ecn",
 492                 .data           = &sysctl_tcp_ecn,
 493                 .maxlen         = sizeof(int),
 494                 .mode           = 0644,
 495                 .proc_handler   = &proc_dointvec
 496         },
 497         {
 498                 .ctl_name       = NET_TCP_DSACK,
 499                 .procname       = "tcp_dsack",
 500                 .data           = &sysctl_tcp_dsack,
 501                 .maxlen         = sizeof(int),
 502                 .mode           = 0644,
 503                 .proc_handler   = &proc_dointvec
 504         },
 505         {
 506                 .ctl_name       = NET_TCP_MEM,
 507                 .procname       = "tcp_mem",
 508                 .data           = &sysctl_tcp_mem,
 509                 .maxlen         = sizeof(sysctl_tcp_mem),
 510                 .mode           = 0644,
 511                 .proc_handler   = &proc_dointvec
 512         },
 513         {
 514                 .ctl_name       = NET_TCP_WMEM,
 515                 .procname       = "tcp_wmem",
 516                 .data           = &sysctl_tcp_wmem,
 517                 .maxlen         = sizeof(sysctl_tcp_wmem),
 518                 .mode           = 0644,
 519                 .proc_handler   = &proc_dointvec
 520         },
 521         {
 522                 .ctl_name       = NET_TCP_RMEM,
 523                 .procname       = "tcp_rmem",
 524                 .data           = &sysctl_tcp_rmem,
 525                 .maxlen         = sizeof(sysctl_tcp_rmem),
 526                 .mode           = 0644,
 527                 .proc_handler   = &proc_dointvec
 528         },
 529         {
 530                 .ctl_name       = NET_TCP_APP_WIN,
 531                 .procname       = "tcp_app_win",
 532                 .data           = &sysctl_tcp_app_win,
 533                 .maxlen         = sizeof(int),
 534                 .mode           = 0644,
 535                 .proc_handler   = &proc_dointvec
 536         },
 537         {
 538                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 539                 .procname       = "tcp_adv_win_scale",
 540                 .data           = &sysctl_tcp_adv_win_scale,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = &proc_dointvec
 544         },
 545         {
 546                 .ctl_name       = NET_TCP_TW_REUSE,
 547                 .procname       = "tcp_tw_reuse",
 548                 .data           = &sysctl_tcp_tw_reuse,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = &proc_dointvec
 552         },
 553         {
 554                 .ctl_name       = NET_TCP_FRTO,
 555                 .procname       = "tcp_frto",
 556                 .data           = &sysctl_tcp_frto,
 557                 .maxlen         = sizeof(int),
 558                 .mode           = 0644,
 559                 .proc_handler   = &proc_dointvec
 560         },
 561         {
 562                 .ctl_name       = NET_TCP_FRTO_RESPONSE,
 563                 .procname       = "tcp_frto_response",
 564                 .data           = &sysctl_tcp_frto_response,
 565                 .maxlen         = sizeof(int),
 566                 .mode           = 0644,
 567                 .proc_handler   = &proc_dointvec
 568         },
 569         {
 570                 .ctl_name       = NET_TCP_LOW_LATENCY,
 571                 .procname       = "tcp_low_latency",
 572                 .data           = &sysctl_tcp_low_latency,
 573                 .maxlen         = sizeof(int),
 574                 .mode           = 0644,
 575                 .proc_handler   = &proc_dointvec
 576         },
 577         {
 578                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 579                 .procname       = "tcp_no_metrics_save",
 580                 .data           = &sysctl_tcp_nometrics_save,
 581                 .maxlen         = sizeof(int),
 582                 .mode           = 0644,
 583                 .proc_handler   = &proc_dointvec,
 584         },
 585         {
 586                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 587                 .procname       = "tcp_moderate_rcvbuf",
 588                 .data           = &sysctl_tcp_moderate_rcvbuf,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = &proc_dointvec,
 592         },
 593         {
 594                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 595                 .procname       = "tcp_tso_win_divisor",
 596                 .data           = &sysctl_tcp_tso_win_divisor,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = &proc_dointvec,
 600         },
 601         {
 602                 .ctl_name       = NET_TCP_CONG_CONTROL,
 603                 .procname       = "tcp_congestion_control",
 604                 .mode           = 0644,
 605                 .maxlen         = TCP_CA_NAME_MAX,
 606                 .proc_handler   = &proc_tcp_congestion_control,
 607                 .strategy       = &sysctl_tcp_congestion_control,
 608         },
 609         {
 610                 .ctl_name       = NET_TCP_ABC,
 611                 .procname       = "tcp_abc",
 612                 .data           = &sysctl_tcp_abc,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = &proc_dointvec,
 616         },
 617         {
 618                 .ctl_name       = NET_TCP_MTU_PROBING,
 619                 .procname       = "tcp_mtu_probing",
 620                 .data           = &sysctl_tcp_mtu_probing,
 621                 .maxlen         = sizeof(int),
 622                 .mode           = 0644,
 623                 .proc_handler   = &proc_dointvec,
 624         },
 625         {
 626                 .ctl_name       = NET_TCP_BASE_MSS,
 627                 .procname       = "tcp_base_mss",
 628                 .data           = &sysctl_tcp_base_mss,
 629                 .maxlen         = sizeof(int),
 630                 .mode           = 0644,
 631                 .proc_handler   = &proc_dointvec,
 632         },
 633         {
 634                 .ctl_name       = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
 635                 .procname       = "tcp_workaround_signed_windows",
 636                 .data           = &sysctl_tcp_workaround_signed_windows,
 637                 .maxlen         = sizeof(int),
 638                 .mode           = 0644,
 639                 .proc_handler   = &proc_dointvec
 640         },
 641 #ifdef CONFIG_NET_DMA
 642         {
 643                 .ctl_name       = NET_TCP_DMA_COPYBREAK,
 644                 .procname       = "tcp_dma_copybreak",
 645                 .data           = &sysctl_tcp_dma_copybreak,
 646                 .maxlen         = sizeof(int),
 647                 .mode           = 0644,
 648                 .proc_handler   = &proc_dointvec
 649         },
 650 #endif
 651         {
 652                 .ctl_name       = NET_TCP_SLOW_START_AFTER_IDLE,
 653                 .procname       = "tcp_slow_start_after_idle",
 654                 .data           = &sysctl_tcp_slow_start_after_idle,
 655                 .maxlen         = sizeof(int),
 656                 .mode           = 0644,
 657                 .proc_handler   = &proc_dointvec
 658         },
 659 #ifdef CONFIG_NETLABEL
 660         {
 661                 .ctl_name       = NET_CIPSOV4_CACHE_ENABLE,
 662                 .procname       = "cipso_cache_enable",
 663                 .data           = &cipso_v4_cache_enabled,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 .proc_handler   = &proc_dointvec,
 667         },
 668         {
 669                 .ctl_name       = NET_CIPSOV4_CACHE_BUCKET_SIZE,
 670                 .procname       = "cipso_cache_bucket_size",
 671                 .data           = &cipso_v4_cache_bucketsize,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = &proc_dointvec,
 675         },
 676         {
 677                 .ctl_name       = NET_CIPSOV4_RBM_OPTFMT,
 678                 .procname       = "cipso_rbm_optfmt",
 679                 .data           = &cipso_v4_rbm_optfmt,
 680                 .maxlen         = sizeof(int),
 681                 .mode           = 0644,
 682                 .proc_handler   = &proc_dointvec,
 683         },
 684         {
 685                 .ctl_name       = NET_CIPSOV4_RBM_STRICTVALID,
 686                 .procname       = "cipso_rbm_strictvalid",
 687                 .data           = &cipso_v4_rbm_strictvalid,
 688                 .maxlen         = sizeof(int),
 689                 .mode           = 0644,
 690                 .proc_handler   = &proc_dointvec,
 691         },
 692 #endif /* CONFIG_NETLABEL */
 693         {
 694                 .procname       = "tcp_available_congestion_control",
 695                 .maxlen         = TCP_CA_BUF_MAX,
 696                 .mode           = 0444,
 697                 .proc_handler   = &proc_tcp_available_congestion_control,
 698         },
 699         {
 700                 .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
 701                 .procname       = "tcp_allowed_congestion_control",
 702                 .maxlen         = TCP_CA_BUF_MAX,
 703                 .mode           = 0644,
 704                 .proc_handler   = &proc_allowed_congestion_control,
 705                 .strategy       = &strategy_allowed_congestion_control,
 706         },
 707         {
 708                 .ctl_name       = NET_TCP_MAX_SSTHRESH,
 709                 .procname       = "tcp_max_ssthresh",
 710                 .data           = &sysctl_tcp_max_ssthresh,
 711                 .maxlen         = sizeof(int),
 712                 .mode           = 0644,
 713                 .proc_handler   = &proc_dointvec,
 714         },
 715         {
 716                 .ctl_name       = CTL_UNNUMBERED,
 717                 .procname       = "udp_mem",
 718                 .data           = &sysctl_udp_mem,
 719                 .maxlen         = sizeof(sysctl_udp_mem),
 720                 .mode           = 0644,
 721                 .proc_handler   = &proc_dointvec_minmax,
 722                 .strategy       = &sysctl_intvec,
 723                 .extra1         = &zero
 724         },
 725         {
 726                 .ctl_name       = CTL_UNNUMBERED,
 727                 .procname       = "udp_rmem_min",
 728                 .data           = &sysctl_udp_rmem_min,
 729                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 730                 .mode           = 0644,
 731                 .proc_handler   = &proc_dointvec_minmax,
 732                 .strategy       = &sysctl_intvec,
 733                 .extra1         = &zero
 734         },
 735         {
 736                 .ctl_name       = CTL_UNNUMBERED,
 737                 .procname       = "udp_wmem_min",
 738                 .data           = &sysctl_udp_wmem_min,
 739                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 740                 .mode           = 0644,
 741                 .proc_handler   = &proc_dointvec_minmax,
 742                 .strategy       = &sysctl_intvec,
 743                 .extra1         = &zero
 744         },
 745         { .ctl_name = 0 }
 746 };
 747
 748 static struct ctl_table ipv4_net_table[] = {
 749         {
 750                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 751                 .procname       = "icmp_echo_ignore_all",
 752                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 753                 .maxlen         = sizeof(int),
 754                 .mode           = 0644,
 755                 .proc_handler   = &proc_dointvec
 756         },
 757         {
 758                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 759                 .procname       = "icmp_echo_ignore_broadcasts",
 760                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 761                 .maxlen         = sizeof(int),
 762                 .mode           = 0644,
 763                 .proc_handler   = &proc_dointvec
 764         },
 765         {
 766                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 767                 .procname       = "icmp_ignore_bogus_error_responses",
 768                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 769                 .maxlen         = sizeof(int),
 770                 .mode           = 0644,
 771                 .proc_handler   = &proc_dointvec
 772         },
 773         {
 774                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 775                 .procname       = "icmp_errors_use_inbound_ifaddr",
 776                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 777                 .maxlen         = sizeof(int),
 778                 .mode           = 0644,
 779                 .proc_handler   = &proc_dointvec
 780         },
 781         {
 782                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 783                 .procname       = "icmp_ratelimit",
 784                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 785                 .maxlen         = sizeof(int),
 786                 .mode           = 0644,
 787                 .proc_handler   = &proc_dointvec_ms_jiffies,
 788                 .strategy       = &sysctl_ms_jiffies
 789         },
 790         {
 791                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 792                 .procname       = "icmp_ratemask",
 793                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 794                 .maxlen         = sizeof(int),
 795                 .mode           = 0644,
 796                 .proc_handler   = &proc_dointvec
 797         },
 798         { }
 799 };
 800
 801 struct ctl_path net_ipv4_ctl_path[] = {
 802         { .procname = "net", .ctl_name = CTL_NET, },
 803         { .procname = "ipv4", .ctl_name = NET_IPV4, },
 804         { },
 805 };
 806 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
 807
 808 static __net_init int ipv4_sysctl_init_net(struct net *net)
 809 {
 810         struct ctl_table *table;
 811
 812         table = ipv4_net_table;
 813         if (net != &init_net) {
 814                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
 815                 if (table == NULL)
 816                         goto err_alloc;
 817
 818                 table[0].data =
 819                         &net->ipv4.sysctl_icmp_echo_ignore_all;
 820                 table[1].data =
 821                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
 822                 table[2].data =
 823                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
 824                 table[3].data =
 825                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
 826                 table[4].data =
 827                         &net->ipv4.sysctl_icmp_ratelimit;
 828                 table[5].data =
 829                         &net->ipv4.sysctl_icmp_ratemask;
 830         }
 831
 832         net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
 833                         net_ipv4_ctl_path, table);
 834         if (net->ipv4.ipv4_hdr == NULL)
 835                 goto err_reg;
 836
 837         return 0;
 838
 839 err_reg:
 840         if (net != &init_net)
 841                 kfree(table);
 842 err_alloc:
 843         return -ENOMEM;
 844 }
 845
 846 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 847 {
 848         struct ctl_table *table;
 849
 850         table = net->ipv4.ipv4_hdr->ctl_table_arg;
 851         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
 852         kfree(table);
 853 }
 854
 855 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 856         .init = ipv4_sysctl_init_net,
 857         .exit = ipv4_sysctl_exit_net,
 858 };
 859
 860 static __init int sysctl_ipv4_init(void)
 861 {
 862         struct ctl_table_header *hdr;
 863
 864         hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
 865         if (hdr == NULL)
 866                 return -ENOMEM;
 867
 868         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
 869                 unregister_sysctl_table(hdr);
 870                 return -ENOMEM;
 871         }
 872
 873         return 0;
 874 }
 875
 876 __initcall(sysctl_ipv4_init);