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
  30 /* Update system visible IP port range */
  31 static void set_local_port_range(int range[2])
  32 {
  33         write_seqlock(&sysctl_local_ports.lock);
  34         sysctl_local_ports.range[0] = range[0];
  35         sysctl_local_ports.range[1] = range[1];
  36         write_sequnlock(&sysctl_local_ports.lock);
  37 }
  38
  39 /* Validate changes from /proc interface. */
  40 static int ipv4_local_port_range(ctl_table *table, int write,
  41                                  void __user *buffer,
  42                                  size_t *lenp, loff_t *ppos)
  43 {
  44         int ret;
  45         int range[2];
  46         ctl_table tmp = {
  47                 .data = &range,
  48                 .maxlen = sizeof(range),
  49                 .mode = table->mode,
  50                 .extra1 = &ip_local_port_range_min,
  51                 .extra2 = &ip_local_port_range_max,
  52         };
  53
  54         inet_get_local_port_range(range, range + 1);
  55         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  56
  57         if (write && ret == 0) {
  58                 if (range[1] < range[0])
  59                         ret = -EINVAL;
  60                 else
  61                         set_local_port_range(range);
  62         }
  63
  64         return ret;
  65 }
  66
  67 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
  68                                        void __user *buffer, size_t *lenp, loff_t *ppos)
  69 {
  70         char val[TCP_CA_NAME_MAX];
  71         ctl_table tbl = {
  72                 .data = val,
  73                 .maxlen = TCP_CA_NAME_MAX,
  74         };
  75         int ret;
  76
  77         tcp_get_default_congestion_control(val);
  78
  79         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
  80         if (write && ret == 0)
  81                 ret = tcp_set_default_congestion_control(val);
  82         return ret;
  83 }
  84
  85 static int proc_tcp_available_congestion_control(ctl_table *ctl,
  86                                                  int write,
  87                                                  void __user *buffer, size_t *lenp,
  88                                                  loff_t *ppos)
  89 {
  90         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
  91         int ret;
  92
  93         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
  94         if (!tbl.data)
  95                 return -ENOMEM;
  96         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
  97         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
  98         kfree(tbl.data);
  99         return ret;
 100 }
 101
 102 static int proc_allowed_congestion_control(ctl_table *ctl,
 103                                            int write,
 104                                            void __user *buffer, size_t *lenp,
 105                                            loff_t *ppos)
 106 {
 107         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 108         int ret;
 109
 110         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 111         if (!tbl.data)
 112                 return -ENOMEM;
 113
 114         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 115         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 116         if (write && ret == 0)
 117                 ret = tcp_set_allowed_congestion_control(tbl.data);
 118         kfree(tbl.data);
 119         return ret;
 120 }
 121
 122 static struct ctl_table ipv4_table[] = {
 123         {
 124                 .procname       = "tcp_timestamps",
 125                 .data           = &sysctl_tcp_timestamps,
 126                 .maxlen         = sizeof(int),
 127                 .mode           = 0644,
 128                 .proc_handler   = proc_dointvec
 129         },
 130         {
 131                 .procname       = "tcp_window_scaling",
 132                 .data           = &sysctl_tcp_window_scaling,
 133                 .maxlen         = sizeof(int),
 134                 .mode           = 0644,
 135                 .proc_handler   = proc_dointvec
 136         },
 137         {
 138                 .procname       = "tcp_sack",
 139                 .data           = &sysctl_tcp_sack,
 140                 .maxlen         = sizeof(int),
 141                 .mode           = 0644,
 142                 .proc_handler   = proc_dointvec
 143         },
 144         {
 145                 .procname       = "tcp_retrans_collapse",
 146                 .data           = &sysctl_tcp_retrans_collapse,
 147                 .maxlen         = sizeof(int),
 148                 .mode           = 0644,
 149                 .proc_handler   = proc_dointvec
 150         },
 151         {
 152                 .procname       = "ip_default_ttl",
 153                 .data           = &sysctl_ip_default_ttl,
 154                 .maxlen         = sizeof(int),
 155                 .mode           = 0644,
 156                 .proc_handler   = ipv4_doint_and_flush,
 157                 .extra2         = &init_net,
 158         },
 159         {
 160                 .procname       = "ip_no_pmtu_disc",
 161                 .data           = &ipv4_config.no_pmtu_disc,
 162                 .maxlen         = sizeof(int),
 163                 .mode           = 0644,
 164                 .proc_handler   = proc_dointvec
 165         },
 166         {
 167                 .procname       = "ip_nonlocal_bind",
 168                 .data           = &sysctl_ip_nonlocal_bind,
 169                 .maxlen         = sizeof(int),
 170                 .mode           = 0644,
 171                 .proc_handler   = proc_dointvec
 172         },
 173         {
 174                 .procname       = "tcp_syn_retries",
 175                 .data           = &sysctl_tcp_syn_retries,
 176                 .maxlen         = sizeof(int),
 177                 .mode           = 0644,
 178                 .proc_handler   = proc_dointvec
 179         },
 180         {
 181                 .procname       = "tcp_synack_retries",
 182                 .data           = &sysctl_tcp_synack_retries,
 183                 .maxlen         = sizeof(int),
 184                 .mode           = 0644,
 185                 .proc_handler   = proc_dointvec
 186         },
 187         {
 188                 .procname       = "tcp_max_orphans",
 189                 .data           = &sysctl_tcp_max_orphans,
 190                 .maxlen         = sizeof(int),
 191                 .mode           = 0644,
 192                 .proc_handler   = proc_dointvec
 193         },
 194         {
 195                 .procname       = "tcp_max_tw_buckets",
 196                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 197                 .maxlen         = sizeof(int),
 198                 .mode           = 0644,
 199                 .proc_handler   = proc_dointvec
 200         },
 201         {
 202                 .procname       = "ip_dynaddr",
 203                 .data           = &sysctl_ip_dynaddr,
 204                 .maxlen         = sizeof(int),
 205                 .mode           = 0644,
 206                 .proc_handler   = proc_dointvec
 207         },
 208         {
 209                 .procname       = "tcp_keepalive_time",
 210                 .data           = &sysctl_tcp_keepalive_time,
 211                 .maxlen         = sizeof(int),
 212                 .mode           = 0644,
 213                 .proc_handler   = proc_dointvec_jiffies,
 214         },
 215         {
 216                 .procname       = "tcp_keepalive_probes",
 217                 .data           = &sysctl_tcp_keepalive_probes,
 218                 .maxlen         = sizeof(int),
 219                 .mode           = 0644,
 220                 .proc_handler   = proc_dointvec
 221         },
 222         {
 223                 .procname       = "tcp_keepalive_intvl",
 224                 .data           = &sysctl_tcp_keepalive_intvl,
 225                 .maxlen         = sizeof(int),
 226                 .mode           = 0644,
 227                 .proc_handler   = proc_dointvec_jiffies,
 228         },
 229         {
 230                 .procname       = "tcp_retries1",
 231                 .data           = &sysctl_tcp_retries1,
 232                 .maxlen         = sizeof(int),
 233                 .mode           = 0644,
 234                 .proc_handler   = proc_dointvec_minmax,
 235                 .extra2         = &tcp_retr1_max
 236         },
 237         {
 238                 .procname       = "tcp_retries2",
 239                 .data           = &sysctl_tcp_retries2,
 240                 .maxlen         = sizeof(int),
 241                 .mode           = 0644,
 242                 .proc_handler   = proc_dointvec
 243         },
 244         {
 245                 .procname       = "tcp_fin_timeout",
 246                 .data           = &sysctl_tcp_fin_timeout,
 247                 .maxlen         = sizeof(int),
 248                 .mode           = 0644,
 249                 .proc_handler   = proc_dointvec_jiffies,
 250         },
 251 #ifdef CONFIG_SYN_COOKIES
 252         {
 253                 .procname       = "tcp_syncookies",
 254                 .data           = &sysctl_tcp_syncookies,
 255                 .maxlen         = sizeof(int),
 256                 .mode           = 0644,
 257                 .proc_handler   = proc_dointvec
 258         },
 259 #endif
 260         {
 261                 .procname       = "tcp_tw_recycle",
 262                 .data           = &tcp_death_row.sysctl_tw_recycle,
 263                 .maxlen         = sizeof(int),
 264                 .mode           = 0644,
 265                 .proc_handler   = proc_dointvec
 266         },
 267         {
 268                 .procname       = "tcp_abort_on_overflow",
 269                 .data           = &sysctl_tcp_abort_on_overflow,
 270                 .maxlen         = sizeof(int),
 271                 .mode           = 0644,
 272                 .proc_handler   = proc_dointvec
 273         },
 274         {
 275                 .procname       = "tcp_stdurg",
 276                 .data           = &sysctl_tcp_stdurg,
 277                 .maxlen         = sizeof(int),
 278                 .mode           = 0644,
 279                 .proc_handler   = proc_dointvec
 280         },
 281         {
 282                 .procname       = "tcp_rfc1337",
 283                 .data           = &sysctl_tcp_rfc1337,
 284                 .maxlen         = sizeof(int),
 285                 .mode           = 0644,
 286                 .proc_handler   = proc_dointvec
 287         },
 288         {
 289                 .procname       = "tcp_max_syn_backlog",
 290                 .data           = &sysctl_max_syn_backlog,
 291                 .maxlen         = sizeof(int),
 292                 .mode           = 0644,
 293                 .proc_handler   = proc_dointvec
 294         },
 295         {
 296                 .procname       = "ip_local_port_range",
 297                 .data           = &sysctl_local_ports.range,
 298                 .maxlen         = sizeof(sysctl_local_ports.range),
 299                 .mode           = 0644,
 300                 .proc_handler   = ipv4_local_port_range,
 301         },
 302         {
 303                 .procname       = "ip_local_reserved_ports",
 304                 .data           = NULL, /* initialized in sysctl_ipv4_init */
 305                 .maxlen         = 65536,
 306                 .mode           = 0644,
 307                 .proc_handler   = proc_do_large_bitmap,
 308         },
 309 #ifdef CONFIG_IP_MULTICAST
 310         {
 311                 .procname       = "igmp_max_memberships",
 312                 .data           = &sysctl_igmp_max_memberships,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = proc_dointvec
 316         },
 317
 318 #endif
 319         {
 320                 .procname       = "igmp_max_msf",
 321                 .data           = &sysctl_igmp_max_msf,
 322                 .maxlen         = sizeof(int),
 323                 .mode           = 0644,
 324                 .proc_handler   = proc_dointvec
 325         },
 326         {
 327                 .procname       = "inet_peer_threshold",
 328                 .data           = &inet_peer_threshold,
 329                 .maxlen         = sizeof(int),
 330                 .mode           = 0644,
 331                 .proc_handler   = proc_dointvec
 332         },
 333         {
 334                 .procname       = "inet_peer_minttl",
 335                 .data           = &inet_peer_minttl,
 336                 .maxlen         = sizeof(int),
 337                 .mode           = 0644,
 338                 .proc_handler   = proc_dointvec_jiffies,
 339         },
 340         {
 341                 .procname       = "inet_peer_maxttl",
 342                 .data           = &inet_peer_maxttl,
 343                 .maxlen         = sizeof(int),
 344                 .mode           = 0644,
 345                 .proc_handler   = proc_dointvec_jiffies,
 346         },
 347         {
 348                 .procname       = "inet_peer_gc_mintime",
 349                 .data           = &inet_peer_gc_mintime,
 350                 .maxlen         = sizeof(int),
 351                 .mode           = 0644,
 352                 .proc_handler   = proc_dointvec_jiffies,
 353         },
 354         {
 355                 .procname       = "inet_peer_gc_maxtime",
 356                 .data           = &inet_peer_gc_maxtime,
 357                 .maxlen         = sizeof(int),
 358                 .mode           = 0644,
 359                 .proc_handler   = proc_dointvec_jiffies,
 360         },
 361         {
 362                 .procname       = "tcp_orphan_retries",
 363                 .data           = &sysctl_tcp_orphan_retries,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = proc_dointvec
 367         },
 368         {
 369                 .procname       = "tcp_fack",
 370                 .data           = &sysctl_tcp_fack,
 371                 .maxlen         = sizeof(int),
 372                 .mode           = 0644,
 373                 .proc_handler   = proc_dointvec
 374         },
 375         {
 376                 .procname       = "tcp_reordering",
 377                 .data           = &sysctl_tcp_reordering,
 378                 .maxlen         = sizeof(int),
 379                 .mode           = 0644,
 380                 .proc_handler   = proc_dointvec
 381         },
 382         {
 383                 .procname       = "tcp_ecn",
 384                 .data           = &sysctl_tcp_ecn,
 385                 .maxlen         = sizeof(int),
 386                 .mode           = 0644,
 387                 .proc_handler   = proc_dointvec
 388         },
 389         {
 390                 .procname       = "tcp_dsack",
 391                 .data           = &sysctl_tcp_dsack,
 392                 .maxlen         = sizeof(int),
 393                 .mode           = 0644,
 394                 .proc_handler   = proc_dointvec
 395         },
 396         {
 397                 .procname       = "tcp_mem",
 398                 .data           = &sysctl_tcp_mem,
 399                 .maxlen         = sizeof(sysctl_tcp_mem),
 400                 .mode           = 0644,
 401                 .proc_handler   = proc_dointvec
 402         },
 403         {
 404                 .procname       = "tcp_wmem",
 405                 .data           = &sysctl_tcp_wmem,
 406                 .maxlen         = sizeof(sysctl_tcp_wmem),
 407                 .mode           = 0644,
 408                 .proc_handler   = proc_dointvec
 409         },
 410         {
 411                 .procname       = "tcp_rmem",
 412                 .data           = &sysctl_tcp_rmem,
 413                 .maxlen         = sizeof(sysctl_tcp_rmem),
 414                 .mode           = 0644,
 415                 .proc_handler   = proc_dointvec
 416         },
 417         {
 418                 .procname       = "tcp_app_win",
 419                 .data           = &sysctl_tcp_app_win,
 420                 .maxlen         = sizeof(int),
 421                 .mode           = 0644,
 422                 .proc_handler   = proc_dointvec
 423         },
 424         {
 425                 .procname       = "tcp_adv_win_scale",
 426                 .data           = &sysctl_tcp_adv_win_scale,
 427                 .maxlen         = sizeof(int),
 428                 .mode           = 0644,
 429                 .proc_handler   = proc_dointvec
 430         },
 431         {
 432                 .procname       = "tcp_tw_reuse",
 433                 .data           = &sysctl_tcp_tw_reuse,
 434                 .maxlen         = sizeof(int),
 435                 .mode           = 0644,
 436                 .proc_handler   = proc_dointvec
 437         },
 438         {
 439                 .procname       = "tcp_frto",
 440                 .data           = &sysctl_tcp_frto,
 441                 .maxlen         = sizeof(int),
 442                 .mode           = 0644,
 443                 .proc_handler   = proc_dointvec
 444         },
 445         {
 446                 .procname       = "tcp_frto_response",
 447                 .data           = &sysctl_tcp_frto_response,
 448                 .maxlen         = sizeof(int),
 449                 .mode           = 0644,
 450                 .proc_handler   = proc_dointvec
 451         },
 452         {
 453                 .procname       = "tcp_low_latency",
 454                 .data           = &sysctl_tcp_low_latency,
 455                 .maxlen         = sizeof(int),
 456                 .mode           = 0644,
 457                 .proc_handler   = proc_dointvec
 458         },
 459         {
 460                 .procname       = "tcp_no_metrics_save",
 461                 .data           = &sysctl_tcp_nometrics_save,
 462                 .maxlen         = sizeof(int),
 463                 .mode           = 0644,
 464                 .proc_handler   = proc_dointvec,
 465         },
 466         {
 467                 .procname       = "tcp_moderate_rcvbuf",
 468                 .data           = &sysctl_tcp_moderate_rcvbuf,
 469                 .maxlen         = sizeof(int),
 470                 .mode           = 0644,
 471                 .proc_handler   = proc_dointvec,
 472         },
 473         {
 474                 .procname       = "tcp_tso_win_divisor",
 475                 .data           = &sysctl_tcp_tso_win_divisor,
 476                 .maxlen         = sizeof(int),
 477                 .mode           = 0644,
 478                 .proc_handler   = proc_dointvec,
 479         },
 480         {
 481                 .procname       = "tcp_congestion_control",
 482                 .mode           = 0644,
 483                 .maxlen         = TCP_CA_NAME_MAX,
 484                 .proc_handler   = proc_tcp_congestion_control,
 485         },
 486         {
 487                 .procname       = "tcp_abc",
 488                 .data           = &sysctl_tcp_abc,
 489                 .maxlen         = sizeof(int),
 490                 .mode           = 0644,
 491                 .proc_handler   = proc_dointvec,
 492         },
 493         {
 494                 .procname       = "tcp_mtu_probing",
 495                 .data           = &sysctl_tcp_mtu_probing,
 496                 .maxlen         = sizeof(int),
 497                 .mode           = 0644,
 498                 .proc_handler   = proc_dointvec,
 499         },
 500         {
 501                 .procname       = "tcp_base_mss",
 502                 .data           = &sysctl_tcp_base_mss,
 503                 .maxlen         = sizeof(int),
 504                 .mode           = 0644,
 505                 .proc_handler   = proc_dointvec,
 506         },
 507         {
 508                 .procname       = "tcp_workaround_signed_windows",
 509                 .data           = &sysctl_tcp_workaround_signed_windows,
 510                 .maxlen         = sizeof(int),
 511                 .mode           = 0644,
 512                 .proc_handler   = proc_dointvec
 513         },
 514 #ifdef CONFIG_NET_DMA
 515         {
 516                 .procname       = "tcp_dma_copybreak",
 517                 .data           = &sysctl_tcp_dma_copybreak,
 518                 .maxlen         = sizeof(int),
 519                 .mode           = 0644,
 520                 .proc_handler   = proc_dointvec
 521         },
 522 #endif
 523         {
 524                 .procname       = "tcp_slow_start_after_idle",
 525                 .data           = &sysctl_tcp_slow_start_after_idle,
 526                 .maxlen         = sizeof(int),
 527                 .mode           = 0644,
 528                 .proc_handler   = proc_dointvec
 529         },
 530 #ifdef CONFIG_NETLABEL
 531         {
 532                 .procname       = "cipso_cache_enable",
 533                 .data           = &cipso_v4_cache_enabled,
 534                 .maxlen         = sizeof(int),
 535                 .mode           = 0644,
 536                 .proc_handler   = proc_dointvec,
 537         },
 538         {
 539                 .procname       = "cipso_cache_bucket_size",
 540                 .data           = &cipso_v4_cache_bucketsize,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_dointvec,
 544         },
 545         {
 546                 .procname       = "cipso_rbm_optfmt",
 547                 .data           = &cipso_v4_rbm_optfmt,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_dointvec,
 551         },
 552         {
 553                 .procname       = "cipso_rbm_strictvalid",
 554                 .data           = &cipso_v4_rbm_strictvalid,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = proc_dointvec,
 558         },
 559 #endif /* CONFIG_NETLABEL */
 560         {
 561                 .procname       = "tcp_available_congestion_control",
 562                 .maxlen         = TCP_CA_BUF_MAX,
 563                 .mode           = 0444,
 564                 .proc_handler   = proc_tcp_available_congestion_control,
 565         },
 566         {
 567                 .procname       = "tcp_allowed_congestion_control",
 568                 .maxlen         = TCP_CA_BUF_MAX,
 569                 .mode           = 0644,
 570                 .proc_handler   = proc_allowed_congestion_control,
 571         },
 572         {
 573                 .procname       = "tcp_max_ssthresh",
 574                 .data           = &sysctl_tcp_max_ssthresh,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = proc_dointvec,
 578         },
 579         {
 580                 .procname       = "tcp_cookie_size",
 581                 .data           = &sysctl_tcp_cookie_size,
 582                 .maxlen         = sizeof(int),
 583                 .mode           = 0644,
 584                 .proc_handler   = proc_dointvec
 585         },
 586         {
 587                 .procname       = "tcp_thin_linear_timeouts",
 588                 .data           = &sysctl_tcp_thin_linear_timeouts,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = proc_dointvec
 592         },
 593         {
 594                 .procname       = "tcp_thin_dupack",
 595                 .data           = &sysctl_tcp_thin_dupack,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dointvec
 599         },
 600         {
 601                 .procname       = "udp_mem",
 602                 .data           = &sysctl_udp_mem,
 603                 .maxlen         = sizeof(sysctl_udp_mem),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dointvec_minmax,
 606                 .extra1         = &zero
 607         },
 608         {
 609                 .procname       = "udp_rmem_min",
 610                 .data           = &sysctl_udp_rmem_min,
 611                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 612                 .mode           = 0644,
 613                 .proc_handler   = proc_dointvec_minmax,
 614                 .extra1         = &zero
 615         },
 616         {
 617                 .procname       = "udp_wmem_min",
 618                 .data           = &sysctl_udp_wmem_min,
 619                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 620                 .mode           = 0644,
 621                 .proc_handler   = proc_dointvec_minmax,
 622                 .extra1         = &zero
 623         },
 624         { }
 625 };
 626
 627 static struct ctl_table ipv4_net_table[] = {
 628         {
 629                 .procname       = "icmp_echo_ignore_all",
 630                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = proc_dointvec
 634         },
 635         {
 636                 .procname       = "icmp_echo_ignore_broadcasts",
 637                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 638                 .maxlen         = sizeof(int),
 639                 .mode           = 0644,
 640                 .proc_handler   = proc_dointvec
 641         },
 642         {
 643                 .procname       = "icmp_ignore_bogus_error_responses",
 644                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 645                 .maxlen         = sizeof(int),
 646                 .mode           = 0644,
 647                 .proc_handler   = proc_dointvec
 648         },
 649         {
 650                 .procname       = "icmp_errors_use_inbound_ifaddr",
 651                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 652                 .maxlen         = sizeof(int),
 653                 .mode           = 0644,
 654                 .proc_handler   = proc_dointvec
 655         },
 656         {
 657                 .procname       = "icmp_ratelimit",
 658                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 659                 .maxlen         = sizeof(int),
 660                 .mode           = 0644,
 661                 .proc_handler   = proc_dointvec_ms_jiffies,
 662         },
 663         {
 664                 .procname       = "icmp_ratemask",
 665                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 666                 .maxlen         = sizeof(int),
 667                 .mode           = 0644,
 668                 .proc_handler   = proc_dointvec
 669         },
 670         {
 671                 .procname       = "rt_cache_rebuild_count",
 672                 .data           = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
 673                 .maxlen         = sizeof(int),
 674                 .mode           = 0644,
 675                 .proc_handler   = proc_dointvec
 676         },
 677         { }
 678 };
 679
 680 struct ctl_path net_ipv4_ctl_path[] = {
 681         { .procname = "net", },
 682         { .procname = "ipv4", },
 683         { },
 684 };
 685 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
 686
 687 static __net_init int ipv4_sysctl_init_net(struct net *net)
 688 {
 689         struct ctl_table *table;
 690
 691         table = ipv4_net_table;
 692         if (!net_eq(net, &init_net)) {
 693                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
 694                 if (table == NULL)
 695                         goto err_alloc;
 696
 697                 table[0].data =
 698                         &net->ipv4.sysctl_icmp_echo_ignore_all;
 699                 table[1].data =
 700                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
 701                 table[2].data =
 702                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
 703                 table[3].data =
 704                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
 705                 table[4].data =
 706                         &net->ipv4.sysctl_icmp_ratelimit;
 707                 table[5].data =
 708                         &net->ipv4.sysctl_icmp_ratemask;
 709                 table[6].data =
 710                         &net->ipv4.sysctl_rt_cache_rebuild_count;
 711         }
 712
 713         net->ipv4.sysctl_rt_cache_rebuild_count = 4;
 714
 715         net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
 716                         net_ipv4_ctl_path, table);
 717         if (net->ipv4.ipv4_hdr == NULL)
 718                 goto err_reg;
 719
 720         return 0;
 721
 722 err_reg:
 723         if (!net_eq(net, &init_net))
 724                 kfree(table);
 725 err_alloc:
 726         return -ENOMEM;
 727 }
 728
 729 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 730 {
 731         struct ctl_table *table;
 732
 733         table = net->ipv4.ipv4_hdr->ctl_table_arg;
 734         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
 735         kfree(table);
 736 }
 737
 738 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 739         .init = ipv4_sysctl_init_net,
 740         .exit = ipv4_sysctl_exit_net,
 741 };
 742
 743 static __init int sysctl_ipv4_init(void)
 744 {
 745         struct ctl_table_header *hdr;
 746         struct ctl_table *i;
 747
 748         for (i = ipv4_table; i->procname; i++) {
 749                 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
 750                         i->data = sysctl_local_reserved_ports;
 751                         break;
 752                 }
 753         }
 754         if (!i->procname)
 755                 return -EINVAL;
 756
 757         hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
 758         if (hdr == NULL)
 759                 return -ENOMEM;
 760
 761         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
 762                 unregister_sysctl_table(hdr);
 763                 return -ENOMEM;
 764         }
 765
 766         return 0;
 767 }
 768
 769 __initcall(sysctl_ipv4_init);