net/ipv4/sysctl_net_ipv4.c

   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 <linux/slab.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/udp.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 static int tcp_adv_win_scale_min = -31;
  30 static int tcp_adv_win_scale_max = 31;
  31 static int ip_ttl_min = 1;
  32 static int ip_ttl_max = 255;
  33
  34 /* Update system visible IP port range */
  35 static void set_local_port_range(int range[2])
  36 {
  37         write_seqlock(&sysctl_local_ports.lock);
  38         sysctl_local_ports.range[0] = range[0];
  39         sysctl_local_ports.range[1] = range[1];
  40         write_sequnlock(&sysctl_local_ports.lock);
  41 }
  42
  43 /* Validate changes from /proc interface. */
  44 static int ipv4_local_port_range(ctl_table *table, int write,
  45                                  void __user *buffer,
  46                                  size_t *lenp, loff_t *ppos)
  47 {
  48         int ret;
  49         int range[2];
  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         inet_get_local_port_range(range, range + 1);
  59         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  60
  61         if (write && ret == 0) {
  62                 if (range[1] < range[0])
  63                         ret = -EINVAL;
  64                 else
  65                         set_local_port_range(range);
  66         }
  67
  68         return ret;
  69 }
  70
  71 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
  72                                        void __user *buffer, size_t *lenp, loff_t *ppos)
  73 {
  74         char val[TCP_CA_NAME_MAX];
  75         ctl_table tbl = {
  76                 .data = val,
  77                 .maxlen = TCP_CA_NAME_MAX,
  78         };
  79         int ret;
  80
  81         tcp_get_default_congestion_control(val);
  82
  83         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
  84         if (write && ret == 0)
  85                 ret = tcp_set_default_congestion_control(val);
  86         return ret;
  87 }
  88
  89 static int proc_tcp_available_congestion_control(ctl_table *ctl,
  90                                                  int write,
  91                                                  void __user *buffer, size_t *lenp,
  92                                                  loff_t *ppos)
  93 {
  94         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
  95         int ret;
  96
  97         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
  98         if (!tbl.data)
  99                 return -ENOMEM;
 100         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 101         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 102         kfree(tbl.data);
 103         return ret;
 104 }
 105
 106 static int proc_allowed_congestion_control(ctl_table *ctl,
 107                                            int write,
 108                                            void __user *buffer, size_t *lenp,
 109                                            loff_t *ppos)
 110 {
 111         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 112         int ret;
 113
 114         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 115         if (!tbl.data)
 116                 return -ENOMEM;
 117
 118         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 119         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 120         if (write && ret == 0)
 121                 ret = tcp_set_allowed_congestion_control(tbl.data);
 122         kfree(tbl.data);
 123         return ret;
 124 }
 125
 126 static struct ctl_table ipv4_table[] = {
 127         {
 128                 .procname       = "tcp_timestamps",
 129                 .data           = &sysctl_tcp_timestamps,
 130                 .maxlen         = sizeof(int),
 131                 .mode           = 0644,
 132                 .proc_handler   = proc_dointvec
 133         },
 134         {
 135                 .procname       = "tcp_window_scaling",
 136                 .data           = &sysctl_tcp_window_scaling,
 137                 .maxlen         = sizeof(int),
 138                 .mode           = 0644,
 139                 .proc_handler   = proc_dointvec
 140         },
 141         {
 142                 .procname       = "tcp_sack",
 143                 .data           = &sysctl_tcp_sack,
 144                 .maxlen         = sizeof(int),
 145                 .mode           = 0644,
 146                 .proc_handler   = proc_dointvec
 147         },
 148         {
 149                 .procname       = "tcp_retrans_collapse",
 150                 .data           = &sysctl_tcp_retrans_collapse,
 151                 .maxlen         = sizeof(int),
 152                 .mode           = 0644,
 153                 .proc_handler   = proc_dointvec
 154         },
 155         {
 156                 .procname       = "ip_default_ttl",
 157                 .data           = &sysctl_ip_default_ttl,
 158                 .maxlen         = sizeof(int),
 159                 .mode           = 0644,
 160                 .proc_handler   = proc_dointvec_minmax,
 161                 .extra1         = &ip_ttl_min,
 162                 .extra2         = &ip_ttl_max,
 163         },
 164         {
 165                 .procname       = "ip_no_pmtu_disc",
 166                 .data           = &ipv4_config.no_pmtu_disc,
 167                 .maxlen         = sizeof(int),
 168                 .mode           = 0644,
 169                 .proc_handler   = proc_dointvec
 170         },
 171         {
 172                 .procname       = "ip_nonlocal_bind",
 173                 .data           = &sysctl_ip_nonlocal_bind,
 174                 .maxlen         = sizeof(int),
 175                 .mode           = 0644,
 176                 .proc_handler   = proc_dointvec
 177         },
 178         {
 179                 .procname       = "tcp_syn_retries",
 180                 .data           = &sysctl_tcp_syn_retries,
 181                 .maxlen         = sizeof(int),
 182                 .mode           = 0644,
 183                 .proc_handler   = proc_dointvec
 184         },
 185         {
 186                 .procname       = "tcp_synack_retries",
 187                 .data           = &sysctl_tcp_synack_retries,
 188                 .maxlen         = sizeof(int),
 189                 .mode           = 0644,
 190                 .proc_handler   = proc_dointvec
 191         },
 192         {
 193                 .procname       = "tcp_max_orphans",
 194                 .data           = &sysctl_tcp_max_orphans,
 195                 .maxlen         = sizeof(int),
 196                 .mode           = 0644,
 197                 .proc_handler   = proc_dointvec
 198         },
 199         {
 200                 .procname       = "tcp_max_tw_buckets",
 201                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 202                 .maxlen         = sizeof(int),
 203                 .mode           = 0644,
 204                 .proc_handler   = proc_dointvec
 205         },
 206         {
 207                 .procname       = "ip_dynaddr",
 208                 .data           = &sysctl_ip_dynaddr,
 209                 .maxlen         = sizeof(int),
 210                 .mode           = 0644,
 211                 .proc_handler   = proc_dointvec
 212         },
 213         {
 214                 .procname       = "tcp_keepalive_time",
 215                 .data           = &sysctl_tcp_keepalive_time,
 216                 .maxlen         = sizeof(int),
 217                 .mode           = 0644,
 218                 .proc_handler   = proc_dointvec_jiffies,
 219         },
 220         {
 221                 .procname       = "tcp_keepalive_probes",
 222                 .data           = &sysctl_tcp_keepalive_probes,
 223                 .maxlen         = sizeof(int),
 224                 .mode           = 0644,
 225                 .proc_handler   = proc_dointvec
 226         },
 227         {
 228                 .procname       = "tcp_keepalive_intvl",
 229                 .data           = &sysctl_tcp_keepalive_intvl,
 230                 .maxlen         = sizeof(int),
 231                 .mode           = 0644,
 232                 .proc_handler   = proc_dointvec_jiffies,
 233         },
 234         {
 235                 .procname       = "tcp_retries1",
 236                 .data           = &sysctl_tcp_retries1,
 237                 .maxlen         = sizeof(int),
 238                 .mode           = 0644,
 239                 .proc_handler   = proc_dointvec_minmax,
 240                 .extra2         = &tcp_retr1_max
 241         },
 242         {
 243                 .procname       = "tcp_retries2",
 244                 .data           = &sysctl_tcp_retries2,
 245                 .maxlen         = sizeof(int),
 246                 .mode           = 0644,
 247                 .proc_handler   = proc_dointvec
 248         },
 249         {
 250                 .procname       = "tcp_fin_timeout",
 251                 .data           = &sysctl_tcp_fin_timeout,
 252                 .maxlen         = sizeof(int),
 253                 .mode           = 0644,
 254                 .proc_handler   = proc_dointvec_jiffies,
 255         },
 256 #ifdef CONFIG_SYN_COOKIES
 257         {
 258                 .procname       = "tcp_syncookies",
 259                 .data           = &sysctl_tcp_syncookies,
 260                 .maxlen         = sizeof(int),
 261                 .mode           = 0644,
 262                 .proc_handler   = proc_dointvec
 263         },
 264 #endif
 265         {
 266                 .procname       = "tcp_tw_recycle",
 267                 .data           = &tcp_death_row.sysctl_tw_recycle,
 268                 .maxlen         = sizeof(int),
 269                 .mode           = 0644,
 270                 .proc_handler   = proc_dointvec
 271         },
 272         {
 273                 .procname       = "tcp_abort_on_overflow",
 274                 .data           = &sysctl_tcp_abort_on_overflow,
 275                 .maxlen         = sizeof(int),
 276                 .mode           = 0644,
 277                 .proc_handler   = proc_dointvec
 278         },
 279         {
 280                 .procname       = "tcp_stdurg",
 281                 .data           = &sysctl_tcp_stdurg,
 282                 .maxlen         = sizeof(int),
 283                 .mode           = 0644,
 284                 .proc_handler   = proc_dointvec
 285         },
 286         {
 287                 .procname       = "tcp_rfc1337",
 288                 .data           = &sysctl_tcp_rfc1337,
 289                 .maxlen         = sizeof(int),
 290                 .mode           = 0644,
 291                 .proc_handler   = proc_dointvec
 292         },
 293         {
 294                 .procname       = "tcp_max_syn_backlog",
 295                 .data           = &sysctl_max_syn_backlog,
 296                 .maxlen         = sizeof(int),
 297                 .mode           = 0644,
 298                 .proc_handler   = proc_dointvec
 299         },
 300         {
 301                 .procname       = "ip_local_port_range",
 302                 .data           = &sysctl_local_ports.range,
 303                 .maxlen         = sizeof(sysctl_local_ports.range),
 304                 .mode           = 0644,
 305                 .proc_handler   = ipv4_local_port_range,
 306         },
 307         {
 308                 .procname       = "ip_local_reserved_ports",
 309                 .data           = NULL, /* initialized in sysctl_ipv4_init */
 310                 .maxlen         = 65536,
 311                 .mode           = 0644,
 312                 .proc_handler   = proc_do_large_bitmap,
 313         },
 314 #ifdef CONFIG_IP_MULTICAST
 315         {
 316                 .procname       = "igmp_max_memberships",
 317                 .data           = &sysctl_igmp_max_memberships,
 318                 .maxlen         = sizeof(int),
 319                 .mode           = 0644,
 320                 .proc_handler   = proc_dointvec
 321         },
 322
 323 #endif
 324         {
 325                 .procname       = "igmp_max_msf",
 326                 .data           = &sysctl_igmp_max_msf,
 327                 .maxlen         = sizeof(int),
 328                 .mode           = 0644,
 329                 .proc_handler   = proc_dointvec
 330         },
 331         {
 332                 .procname       = "inet_peer_threshold",
 333                 .data           = &inet_peer_threshold,
 334                 .maxlen         = sizeof(int),
 335                 .mode           = 0644,
 336                 .proc_handler   = proc_dointvec
 337         },
 338         {
 339                 .procname       = "inet_peer_minttl",
 340                 .data           = &inet_peer_minttl,
 341                 .maxlen         = sizeof(int),
 342                 .mode           = 0644,
 343                 .proc_handler   = proc_dointvec_jiffies,
 344         },
 345         {
 346                 .procname       = "inet_peer_maxttl",
 347                 .data           = &inet_peer_maxttl,
 348                 .maxlen         = sizeof(int),
 349                 .mode           = 0644,
 350                 .proc_handler   = proc_dointvec_jiffies,
 351         },
 352         {
 353                 .procname       = "inet_peer_gc_mintime",
 354                 .data           = &inet_peer_gc_mintime,
 355                 .maxlen         = sizeof(int),
 356                 .mode           = 0644,
 357                 .proc_handler   = proc_dointvec_jiffies,
 358         },
 359         {
 360                 .procname       = "inet_peer_gc_maxtime",
 361                 .data           = &inet_peer_gc_maxtime,
 362                 .maxlen         = sizeof(int),
 363                 .mode           = 0644,
 364                 .proc_handler   = proc_dointvec_jiffies,
 365         },
 366         {
 367                 .procname       = "tcp_orphan_retries",
 368                 .data           = &sysctl_tcp_orphan_retries,
 369                 .maxlen         = sizeof(int),
 370                 .mode           = 0644,
 371                 .proc_handler   = proc_dointvec
 372         },
 373         {
 374                 .procname       = "tcp_fack",
 375                 .data           = &sysctl_tcp_fack,
 376                 .maxlen         = sizeof(int),
 377                 .mode           = 0644,
 378                 .proc_handler   = proc_dointvec
 379         },
 380         {
 381                 .procname       = "tcp_reordering",
 382                 .data           = &sysctl_tcp_reordering,
 383                 .maxlen         = sizeof(int),
 384                 .mode           = 0644,
 385                 .proc_handler   = proc_dointvec
 386         },
 387         {
 388                 .procname       = "tcp_ecn",
 389                 .data           = &sysctl_tcp_ecn,
 390                 .maxlen         = sizeof(int),
 391                 .mode           = 0644,
 392                 .proc_handler   = proc_dointvec
 393         },
 394         {
 395                 .procname       = "tcp_dsack",
 396                 .data           = &sysctl_tcp_dsack,
 397                 .maxlen         = sizeof(int),
 398                 .mode           = 0644,
 399                 .proc_handler   = proc_dointvec
 400         },
 401         {
 402                 .procname       = "tcp_mem",
 403                 .data           = &sysctl_tcp_mem,
 404                 .maxlen         = sizeof(sysctl_tcp_mem),
 405                 .mode           = 0644,
 406                 .proc_handler   = proc_doulongvec_minmax
 407         },
 408         {
 409                 .procname       = "tcp_wmem",
 410                 .data           = &sysctl_tcp_wmem,
 411                 .maxlen         = sizeof(sysctl_tcp_wmem),
 412                 .mode           = 0644,
 413                 .proc_handler   = proc_dointvec
 414         },
 415         {
 416                 .procname       = "tcp_rmem",
 417                 .data           = &sysctl_tcp_rmem,
 418                 .maxlen         = sizeof(sysctl_tcp_rmem),
 419                 .mode           = 0644,
 420                 .proc_handler   = proc_dointvec
 421         },
 422         {
 423                 .procname       = "tcp_app_win",
 424                 .data           = &sysctl_tcp_app_win,
 425                 .maxlen         = sizeof(int),
 426                 .mode           = 0644,
 427                 .proc_handler   = proc_dointvec
 428         },
 429         {
 430                 .procname       = "tcp_adv_win_scale",
 431                 .data           = &sysctl_tcp_adv_win_scale,
 432                 .maxlen         = sizeof(int),
 433                 .mode           = 0644,
 434                 .proc_handler   = proc_dointvec_minmax,
 435                 .extra1         = &tcp_adv_win_scale_min,
 436                 .extra2         = &tcp_adv_win_scale_max,
 437         },
 438         {
 439                 .procname       = "tcp_tw_reuse",
 440                 .data           = &sysctl_tcp_tw_reuse,
 441                 .maxlen         = sizeof(int),
 442                 .mode           = 0644,
 443                 .proc_handler   = proc_dointvec
 444         },
 445         {
 446                 .procname       = "tcp_frto",
 447                 .data           = &sysctl_tcp_frto,
 448                 .maxlen         = sizeof(int),
 449                 .mode           = 0644,
 450                 .proc_handler   = proc_dointvec
 451         },
 452         {
 453                 .procname       = "tcp_frto_response",
 454                 .data           = &sysctl_tcp_frto_response,
 455                 .maxlen         = sizeof(int),
 456                 .mode           = 0644,
 457                 .proc_handler   = proc_dointvec
 458         },
 459         {
 460                 .procname       = "tcp_low_latency",
 461                 .data           = &sysctl_tcp_low_latency,
 462                 .maxlen         = sizeof(int),
 463                 .mode           = 0644,
 464                 .proc_handler   = proc_dointvec
 465         },
 466         {
 467                 .procname       = "tcp_no_metrics_save",
 468                 .data           = &sysctl_tcp_nometrics_save,
 469                 .maxlen         = sizeof(int),
 470                 .mode           = 0644,
 471                 .proc_handler   = proc_dointvec,
 472         },
 473         {
 474                 .procname       = "tcp_moderate_rcvbuf",
 475                 .data           = &sysctl_tcp_moderate_rcvbuf,
 476                 .maxlen         = sizeof(int),
 477                 .mode           = 0644,
 478                 .proc_handler   = proc_dointvec,
 479         },
 480         {
 481                 .procname       = "tcp_tso_win_divisor",
 482                 .data           = &sysctl_tcp_tso_win_divisor,
 483                 .maxlen         = sizeof(int),
 484                 .mode           = 0644,
 485                 .proc_handler   = proc_dointvec,
 486         },
 487         {
 488                 .procname       = "tcp_congestion_control",
 489                 .mode           = 0644,
 490                 .maxlen         = TCP_CA_NAME_MAX,
 491                 .proc_handler   = proc_tcp_congestion_control,
 492         },
 493         {
 494                 .procname       = "tcp_abc",
 495                 .data           = &sysctl_tcp_abc,
 496                 .maxlen         = sizeof(int),
 497                 .mode           = 0644,
 498                 .proc_handler   = proc_dointvec,
 499         },
 500         {
 501                 .procname       = "tcp_mtu_probing",
 502                 .data           = &sysctl_tcp_mtu_probing,
 503                 .maxlen         = sizeof(int),
 504                 .mode           = 0644,
 505                 .proc_handler   = proc_dointvec,
 506         },
 507         {
 508                 .procname       = "tcp_base_mss",
 509                 .data           = &sysctl_tcp_base_mss,
 510                 .maxlen         = sizeof(int),
 511                 .mode           = 0644,
 512                 .proc_handler   = proc_dointvec,
 513         },
 514         {
 515                 .procname       = "tcp_workaround_signed_windows",
 516                 .data           = &sysctl_tcp_workaround_signed_windows,
 517                 .maxlen         = sizeof(int),
 518                 .mode           = 0644,
 519                 .proc_handler   = proc_dointvec
 520         },
 521 #ifdef CONFIG_NET_DMA
 522         {
 523                 .procname       = "tcp_dma_copybreak",
 524                 .data           = &sysctl_tcp_dma_copybreak,
 525                 .maxlen         = sizeof(int),
 526                 .mode           = 0644,
 527                 .proc_handler   = proc_dointvec
 528         },
 529 #endif
 530         {
 531                 .procname       = "tcp_slow_start_after_idle",
 532                 .data           = &sysctl_tcp_slow_start_after_idle,
 533                 .maxlen         = sizeof(int),
 534                 .mode           = 0644,
 535                 .proc_handler   = proc_dointvec
 536         },
 537 #ifdef CONFIG_NETLABEL
 538         {
 539                 .procname       = "cipso_cache_enable",
 540                 .data           = &cipso_v4_cache_enabled,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_dointvec,
 544         },
 545         {
 546                 .procname       = "cipso_cache_bucket_size",
 547                 .data           = &cipso_v4_cache_bucketsize,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_dointvec,
 551         },
 552         {
 553                 .procname       = "cipso_rbm_optfmt",
 554                 .data           = &cipso_v4_rbm_optfmt,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = proc_dointvec,
 558         },
 559         {
 560                 .procname       = "cipso_rbm_strictvalid",
 561                 .data           = &cipso_v4_rbm_strictvalid,
 562                 .maxlen         = sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_dointvec,
 565         },
 566 #endif /* CONFIG_NETLABEL */
 567         {
 568                 .procname       = "tcp_available_congestion_control",
 569                 .maxlen         = TCP_CA_BUF_MAX,
 570                 .mode           = 0444,
 571                 .proc_handler   = proc_tcp_available_congestion_control,
 572         },
 573         {
 574                 .procname       = "tcp_allowed_congestion_control",
 575                 .maxlen         = TCP_CA_BUF_MAX,
 576                 .mode           = 0644,
 577                 .proc_handler   = proc_allowed_congestion_control,
 578         },
 579         {
 580                 .procname       = "tcp_max_ssthresh",
 581                 .data           = &sysctl_tcp_max_ssthresh,
 582                 .maxlen         = sizeof(int),
 583                 .mode           = 0644,
 584                 .proc_handler   = proc_dointvec,
 585         },
 586         {
 587                 .procname       = "tcp_cookie_size",
 588                 .data           = &sysctl_tcp_cookie_size,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = proc_dointvec
 592         },
 593         {
 594                 .procname       = "tcp_thin_linear_timeouts",
 595                 .data           = &sysctl_tcp_thin_linear_timeouts,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dointvec
 599         },
 600         {
 601                 .procname       = "tcp_thin_dupack",
 602                 .data           = &sysctl_tcp_thin_dupack,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dointvec
 606         },
 607         {
 608                 .procname       = "udp_mem",
 609                 .data           = &sysctl_udp_mem,
 610                 .maxlen         = sizeof(sysctl_udp_mem),
 611                 .mode           = 0644,
 612                 .proc_handler   = proc_doulongvec_minmax,
 613         },
 614         {
 615                 .procname       = "udp_rmem_min",
 616                 .data           = &sysctl_udp_rmem_min,
 617                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 618                 .mode           = 0644,
 619                 .proc_handler   = proc_dointvec_minmax,
 620                 .extra1         = &zero
 621         },
 622         {
 623                 .procname       = "udp_wmem_min",
 624                 .data           = &sysctl_udp_wmem_min,
 625                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 626                 .mode           = 0644,
 627                 .proc_handler   = proc_dointvec_minmax,
 628                 .extra1         = &zero
 629         },
 630         { }
 631 };
 632
 633 static struct ctl_table ipv4_net_table[] = {
 634         {
 635                 .procname       = "icmp_echo_ignore_all",
 636                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 637                 .maxlen         = sizeof(int),
 638                 .mode           = 0644,
 639                 .proc_handler   = proc_dointvec
 640         },
 641         {
 642                 .procname       = "icmp_echo_ignore_broadcasts",
 643                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 644                 .maxlen         = sizeof(int),
 645                 .mode           = 0644,
 646                 .proc_handler   = proc_dointvec
 647         },
 648         {
 649                 .procname       = "icmp_ignore_bogus_error_responses",
 650                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 651                 .maxlen         = sizeof(int),
 652                 .mode           = 0644,
 653                 .proc_handler   = proc_dointvec
 654         },
 655         {
 656                 .procname       = "icmp_errors_use_inbound_ifaddr",
 657                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 658                 .maxlen         = sizeof(int),
 659                 .mode           = 0644,
 660                 .proc_handler   = proc_dointvec
 661         },
 662         {
 663                 .procname       = "icmp_ratelimit",
 664                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 665                 .maxlen         = sizeof(int),
 666                 .mode           = 0644,
 667                 .proc_handler   = proc_dointvec_ms_jiffies,
 668         },
 669         {
 670                 .procname       = "icmp_ratemask",
 671                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = proc_dointvec
 675         },
 676         {
 677                 .procname       = "rt_cache_rebuild_count",
 678                 .data           = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
 679                 .maxlen         = sizeof(int),
 680                 .mode           = 0644,
 681                 .proc_handler   = proc_dointvec
 682         },
 683         { }
 684 };
 685
 686 struct ctl_path net_ipv4_ctl_path[] = {
 687         { .procname = "net", },
 688         { .procname = "ipv4", },
 689         { },
 690 };
 691 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
 692
 693 static __net_init int ipv4_sysctl_init_net(struct net *net)
 694 {
 695         struct ctl_table *table;
 696
 697         table = ipv4_net_table;
 698         if (!net_eq(net, &init_net)) {
 699                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
 700                 if (table == NULL)
 701                         goto err_alloc;
 702
 703                 table[0].data =
 704                         &net->ipv4.sysctl_icmp_echo_ignore_all;
 705                 table[1].data =
 706                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
 707                 table[2].data =
 708                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
 709                 table[3].data =
 710                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
 711                 table[4].data =
 712                         &net->ipv4.sysctl_icmp_ratelimit;
 713                 table[5].data =
 714                         &net->ipv4.sysctl_icmp_ratemask;
 715                 table[6].data =
 716                         &net->ipv4.sysctl_rt_cache_rebuild_count;
 717         }
 718
 719         net->ipv4.sysctl_rt_cache_rebuild_count = 4;
 720
 721         net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
 722                         net_ipv4_ctl_path, table);
 723         if (net->ipv4.ipv4_hdr == NULL)
 724                 goto err_reg;
 725
 726         return 0;
 727
 728 err_reg:
 729         if (!net_eq(net, &init_net))
 730                 kfree(table);
 731 err_alloc:
 732         return -ENOMEM;
 733 }
 734
 735 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 736 {
 737         struct ctl_table *table;
 738
 739         table = net->ipv4.ipv4_hdr->ctl_table_arg;
 740         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
 741         kfree(table);
 742 }
 743
 744 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 745         .init = ipv4_sysctl_init_net,
 746         .exit = ipv4_sysctl_exit_net,
 747 };
 748
 749 static __init int sysctl_ipv4_init(void)
 750 {
 751         struct ctl_table_header *hdr;
 752         struct ctl_table *i;
 753
 754         for (i = ipv4_table; i->procname; i++) {
 755                 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
 756                         i->data = sysctl_local_reserved_ports;
 757                         break;
 758                 }
 759         }
 760         if (!i->procname)
 761                 return -EINVAL;
 762
 763         hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
 764         if (hdr == NULL)
 765                 return -ENOMEM;
 766
 767         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
 768                 unregister_sysctl_table(hdr);
 769                 return -ENOMEM;
 770         }
 771
 772         return 0;
 773 }
 774
 775 __initcall(sysctl_ipv4_init);