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 <linux/nsproxy.h>
  17 #include <net/snmp.h>
  18 #include <net/icmp.h>
  19 #include <net/ip.h>
  20 #include <net/route.h>
  21 #include <net/tcp.h>
  22 #include <net/udp.h>
  23 #include <net/cipso_ipv4.h>
  24 #include <net/inet_frag.h>
  25 #include <net/ping.h>
  26
  27 static int zero;
  28 static int tcp_retr1_max = 255;
  29 static int ip_local_port_range_min[] = { 1, 1 };
  30 static int ip_local_port_range_max[] = { 65535, 65535 };
  31 static int tcp_adv_win_scale_min = -31;
  32 static int tcp_adv_win_scale_max = 31;
  33 static int ip_ttl_min = 1;
  34 static int ip_ttl_max = 255;
  35 static int ip_ping_group_range_min[] = { 0, 0 };
  36 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  37
  38 /* Update system visible IP port range */
  39 static void set_local_port_range(int range[2])
  40 {
  41         write_seqlock(&sysctl_local_ports.lock);
  42         sysctl_local_ports.range[0] = range[0];
  43         sysctl_local_ports.range[1] = range[1];
  44         write_sequnlock(&sysctl_local_ports.lock);
  45 }
  46
  47 /* Validate changes from /proc interface. */
  48 static int ipv4_local_port_range(ctl_table *table, int write,
  49                                  void __user *buffer,
  50                                  size_t *lenp, loff_t *ppos)
  51 {
  52         int ret;
  53         int range[2];
  54         ctl_table tmp = {
  55                 .data = &range,
  56                 .maxlen = sizeof(range),
  57                 .mode = table->mode,
  58                 .extra1 = &ip_local_port_range_min,
  59                 .extra2 = &ip_local_port_range_max,
  60         };
  61
  62         inet_get_local_port_range(range, range + 1);
  63         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  64
  65         if (write && ret == 0) {
  66                 if (range[1] < range[0])
  67                         ret = -EINVAL;
  68                 else
  69                         set_local_port_range(range);
  70         }
  71
  72         return ret;
  73 }
  74
  75
  76 void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, gid_t *high)
  77 {
  78         gid_t *data = table->data;
  79         unsigned seq;
  80         do {
  81                 seq = read_seqbegin(&sysctl_local_ports.lock);
  82
  83                 *low = data[0];
  84                 *high = data[1];
  85         } while (read_seqretry(&sysctl_local_ports.lock, seq));
  86 }
  87
  88 /* Update system visible IP port range */
  89 static void set_ping_group_range(struct ctl_table *table, int range[2])
  90 {
  91         gid_t *data = table->data;
  92         write_seqlock(&sysctl_local_ports.lock);
  93         data[0] = range[0];
  94         data[1] = range[1];
  95         write_sequnlock(&sysctl_local_ports.lock);
  96 }
  97
  98 /* Validate changes from /proc interface. */
  99 static int ipv4_ping_group_range(ctl_table *table, int write,
 100                                  void __user *buffer,
 101                                  size_t *lenp, loff_t *ppos)
 102 {
 103         int ret;
 104         gid_t range[2];
 105         ctl_table tmp = {
 106                 .data = &range,
 107                 .maxlen = sizeof(range),
 108                 .mode = table->mode,
 109                 .extra1 = &ip_ping_group_range_min,
 110                 .extra2 = &ip_ping_group_range_max,
 111         };
 112
 113         inet_get_ping_group_range_table(table, range, range + 1);
 114         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 115
 116         if (write && ret == 0)
 117                 set_ping_group_range(table, range);
 118
 119         return ret;
 120 }
 121
 122 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
 123                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 124 {
 125         char val[TCP_CA_NAME_MAX];
 126         ctl_table tbl = {
 127                 .data = val,
 128                 .maxlen = TCP_CA_NAME_MAX,
 129         };
 130         int ret;
 131
 132         tcp_get_default_congestion_control(val);
 133
 134         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 135         if (write && ret == 0)
 136                 ret = tcp_set_default_congestion_control(val);
 137         return ret;
 138 }
 139
 140 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 141                                                  int write,
 142                                                  void __user *buffer, size_t *lenp,
 143                                                  loff_t *ppos)
 144 {
 145         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 146         int ret;
 147
 148         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 149         if (!tbl.data)
 150                 return -ENOMEM;
 151         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 152         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 153         kfree(tbl.data);
 154         return ret;
 155 }
 156
 157 static int proc_allowed_congestion_control(ctl_table *ctl,
 158                                            int write,
 159                                            void __user *buffer, size_t *lenp,
 160                                            loff_t *ppos)
 161 {
 162         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 163         int ret;
 164
 165         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 166         if (!tbl.data)
 167                 return -ENOMEM;
 168
 169         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 170         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 171         if (write && ret == 0)
 172                 ret = tcp_set_allowed_congestion_control(tbl.data);
 173         kfree(tbl.data);
 174         return ret;
 175 }
 176
 177 static struct ctl_table ipv4_table[] = {
 178         {
 179                 .procname       = "tcp_timestamps",
 180                 .data           = &sysctl_tcp_timestamps,
 181                 .maxlen         = sizeof(int),
 182                 .mode           = 0644,
 183                 .proc_handler   = proc_dointvec
 184         },
 185         {
 186                 .procname       = "tcp_window_scaling",
 187                 .data           = &sysctl_tcp_window_scaling,
 188                 .maxlen         = sizeof(int),
 189                 .mode           = 0644,
 190                 .proc_handler   = proc_dointvec
 191         },
 192         {
 193                 .procname       = "tcp_sack",
 194                 .data           = &sysctl_tcp_sack,
 195                 .maxlen         = sizeof(int),
 196                 .mode           = 0644,
 197                 .proc_handler   = proc_dointvec
 198         },
 199         {
 200                 .procname       = "tcp_retrans_collapse",
 201                 .data           = &sysctl_tcp_retrans_collapse,
 202                 .maxlen         = sizeof(int),
 203                 .mode           = 0644,
 204                 .proc_handler   = proc_dointvec
 205         },
 206         {
 207                 .procname       = "ip_default_ttl",
 208                 .data           = &sysctl_ip_default_ttl,
 209                 .maxlen         = sizeof(int),
 210                 .mode           = 0644,
 211                 .proc_handler   = proc_dointvec_minmax,
 212                 .extra1         = &ip_ttl_min,
 213                 .extra2         = &ip_ttl_max,
 214         },
 215         {
 216                 .procname       = "ip_no_pmtu_disc",
 217                 .data           = &ipv4_config.no_pmtu_disc,
 218                 .maxlen         = sizeof(int),
 219                 .mode           = 0644,
 220                 .proc_handler   = proc_dointvec
 221         },
 222         {
 223                 .procname       = "ip_nonlocal_bind",
 224                 .data           = &sysctl_ip_nonlocal_bind,
 225                 .maxlen         = sizeof(int),
 226                 .mode           = 0644,
 227                 .proc_handler   = proc_dointvec
 228         },
 229         {
 230                 .procname       = "tcp_syn_retries",
 231                 .data           = &sysctl_tcp_syn_retries,
 232                 .maxlen         = sizeof(int),
 233                 .mode           = 0644,
 234                 .proc_handler   = proc_dointvec
 235         },
 236         {
 237                 .procname       = "tcp_synack_retries",
 238                 .data           = &sysctl_tcp_synack_retries,
 239                 .maxlen         = sizeof(int),
 240                 .mode           = 0644,
 241                 .proc_handler   = proc_dointvec
 242         },
 243         {
 244                 .procname       = "tcp_max_orphans",
 245                 .data           = &sysctl_tcp_max_orphans,
 246                 .maxlen         = sizeof(int),
 247                 .mode           = 0644,
 248                 .proc_handler   = proc_dointvec
 249         },
 250         {
 251                 .procname       = "tcp_max_tw_buckets",
 252                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 253                 .maxlen         = sizeof(int),
 254                 .mode           = 0644,
 255                 .proc_handler   = proc_dointvec
 256         },
 257         {
 258                 .procname       = "ip_dynaddr",
 259                 .data           = &sysctl_ip_dynaddr,
 260                 .maxlen         = sizeof(int),
 261                 .mode           = 0644,
 262                 .proc_handler   = proc_dointvec
 263         },
 264         {
 265                 .procname       = "tcp_keepalive_time",
 266                 .data           = &sysctl_tcp_keepalive_time,
 267                 .maxlen         = sizeof(int),
 268                 .mode           = 0644,
 269                 .proc_handler   = proc_dointvec_jiffies,
 270         },
 271         {
 272                 .procname       = "tcp_keepalive_probes",
 273                 .data           = &sysctl_tcp_keepalive_probes,
 274                 .maxlen         = sizeof(int),
 275                 .mode           = 0644,
 276                 .proc_handler   = proc_dointvec
 277         },
 278         {
 279                 .procname       = "tcp_keepalive_intvl",
 280                 .data           = &sysctl_tcp_keepalive_intvl,
 281                 .maxlen         = sizeof(int),
 282                 .mode           = 0644,
 283                 .proc_handler   = proc_dointvec_jiffies,
 284         },
 285         {
 286                 .procname       = "tcp_retries1",
 287                 .data           = &sysctl_tcp_retries1,
 288                 .maxlen         = sizeof(int),
 289                 .mode           = 0644,
 290                 .proc_handler   = proc_dointvec_minmax,
 291                 .extra2         = &tcp_retr1_max
 292         },
 293         {
 294                 .procname       = "tcp_retries2",
 295                 .data           = &sysctl_tcp_retries2,
 296                 .maxlen         = sizeof(int),
 297                 .mode           = 0644,
 298                 .proc_handler   = proc_dointvec
 299         },
 300         {
 301                 .procname       = "tcp_fin_timeout",
 302                 .data           = &sysctl_tcp_fin_timeout,
 303                 .maxlen         = sizeof(int),
 304                 .mode           = 0644,
 305                 .proc_handler   = proc_dointvec_jiffies,
 306         },
 307 #ifdef CONFIG_SYN_COOKIES
 308         {
 309                 .procname       = "tcp_syncookies",
 310                 .data           = &sysctl_tcp_syncookies,
 311                 .maxlen         = sizeof(int),
 312                 .mode           = 0644,
 313                 .proc_handler   = proc_dointvec
 314         },
 315 #endif
 316         {
 317                 .procname       = "tcp_tw_recycle",
 318                 .data           = &tcp_death_row.sysctl_tw_recycle,
 319                 .maxlen         = sizeof(int),
 320                 .mode           = 0644,
 321                 .proc_handler   = proc_dointvec
 322         },
 323         {
 324                 .procname       = "tcp_abort_on_overflow",
 325                 .data           = &sysctl_tcp_abort_on_overflow,
 326                 .maxlen         = sizeof(int),
 327                 .mode           = 0644,
 328                 .proc_handler   = proc_dointvec
 329         },
 330         {
 331                 .procname       = "tcp_stdurg",
 332                 .data           = &sysctl_tcp_stdurg,
 333                 .maxlen         = sizeof(int),
 334                 .mode           = 0644,
 335                 .proc_handler   = proc_dointvec
 336         },
 337         {
 338                 .procname       = "tcp_rfc1337",
 339                 .data           = &sysctl_tcp_rfc1337,
 340                 .maxlen         = sizeof(int),
 341                 .mode           = 0644,
 342                 .proc_handler   = proc_dointvec
 343         },
 344         {
 345                 .procname       = "tcp_max_syn_backlog",
 346                 .data           = &sysctl_max_syn_backlog,
 347                 .maxlen         = sizeof(int),
 348                 .mode           = 0644,
 349                 .proc_handler   = proc_dointvec
 350         },
 351         {
 352                 .procname       = "ip_local_port_range",
 353                 .data           = &sysctl_local_ports.range,
 354                 .maxlen         = sizeof(sysctl_local_ports.range),
 355                 .mode           = 0644,
 356                 .proc_handler   = ipv4_local_port_range,
 357         },
 358         {
 359                 .procname       = "ip_local_reserved_ports",
 360                 .data           = NULL, /* initialized in sysctl_ipv4_init */
 361                 .maxlen         = 65536,
 362                 .mode           = 0644,
 363                 .proc_handler   = proc_do_large_bitmap,
 364         },
 365         {
 366                 .procname       = "igmp_max_memberships",
 367                 .data           = &sysctl_igmp_max_memberships,
 368                 .maxlen         = sizeof(int),
 369                 .mode           = 0644,
 370                 .proc_handler   = proc_dointvec
 371         },
 372         {
 373                 .procname       = "igmp_max_msf",
 374                 .data           = &sysctl_igmp_max_msf,
 375                 .maxlen         = sizeof(int),
 376                 .mode           = 0644,
 377                 .proc_handler   = proc_dointvec
 378         },
 379         {
 380                 .procname       = "inet_peer_threshold",
 381                 .data           = &inet_peer_threshold,
 382                 .maxlen         = sizeof(int),
 383                 .mode           = 0644,
 384                 .proc_handler   = proc_dointvec
 385         },
 386         {
 387                 .procname       = "inet_peer_minttl",
 388                 .data           = &inet_peer_minttl,
 389                 .maxlen         = sizeof(int),
 390                 .mode           = 0644,
 391                 .proc_handler   = proc_dointvec_jiffies,
 392         },
 393         {
 394                 .procname       = "inet_peer_maxttl",
 395                 .data           = &inet_peer_maxttl,
 396                 .maxlen         = sizeof(int),
 397                 .mode           = 0644,
 398                 .proc_handler   = proc_dointvec_jiffies,
 399         },
 400         {
 401                 .procname       = "inet_peer_gc_mintime",
 402                 .data           = &inet_peer_gc_mintime,
 403                 .maxlen         = sizeof(int),
 404                 .mode           = 0644,
 405                 .proc_handler   = proc_dointvec_jiffies,
 406         },
 407         {
 408                 .procname       = "inet_peer_gc_maxtime",
 409                 .data           = &inet_peer_gc_maxtime,
 410                 .maxlen         = sizeof(int),
 411                 .mode           = 0644,
 412                 .proc_handler   = proc_dointvec_jiffies,
 413         },
 414         {
 415                 .procname       = "tcp_orphan_retries",
 416                 .data           = &sysctl_tcp_orphan_retries,
 417                 .maxlen         = sizeof(int),
 418                 .mode           = 0644,
 419                 .proc_handler   = proc_dointvec
 420         },
 421         {
 422                 .procname       = "tcp_fack",
 423                 .data           = &sysctl_tcp_fack,
 424                 .maxlen         = sizeof(int),
 425                 .mode           = 0644,
 426                 .proc_handler   = proc_dointvec
 427         },
 428         {
 429                 .procname       = "tcp_reordering",
 430                 .data           = &sysctl_tcp_reordering,
 431                 .maxlen         = sizeof(int),
 432                 .mode           = 0644,
 433                 .proc_handler   = proc_dointvec
 434         },
 435         {
 436                 .procname       = "tcp_ecn",
 437                 .data           = &sysctl_tcp_ecn,
 438                 .maxlen         = sizeof(int),
 439                 .mode           = 0644,
 440                 .proc_handler   = proc_dointvec
 441         },
 442         {
 443                 .procname       = "tcp_dsack",
 444                 .data           = &sysctl_tcp_dsack,
 445                 .maxlen         = sizeof(int),
 446                 .mode           = 0644,
 447                 .proc_handler   = proc_dointvec
 448         },
 449         {
 450                 .procname       = "tcp_mem",
 451                 .data           = &sysctl_tcp_mem,
 452                 .maxlen         = sizeof(sysctl_tcp_mem),
 453                 .mode           = 0644,
 454                 .proc_handler   = proc_doulongvec_minmax
 455         },
 456         {
 457                 .procname       = "tcp_wmem",
 458                 .data           = &sysctl_tcp_wmem,
 459                 .maxlen         = sizeof(sysctl_tcp_wmem),
 460                 .mode           = 0644,
 461                 .proc_handler   = proc_dointvec
 462         },
 463         {
 464                 .procname       = "tcp_rmem",
 465                 .data           = &sysctl_tcp_rmem,
 466                 .maxlen         = sizeof(sysctl_tcp_rmem),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec
 469         },
 470         {
 471                 .procname       = "tcp_app_win",
 472                 .data           = &sysctl_tcp_app_win,
 473                 .maxlen         = sizeof(int),
 474                 .mode           = 0644,
 475                 .proc_handler   = proc_dointvec
 476         },
 477         {
 478                 .procname       = "tcp_adv_win_scale",
 479                 .data           = &sysctl_tcp_adv_win_scale,
 480                 .maxlen         = sizeof(int),
 481                 .mode           = 0644,
 482                 .proc_handler   = proc_dointvec_minmax,
 483                 .extra1         = &tcp_adv_win_scale_min,
 484                 .extra2         = &tcp_adv_win_scale_max,
 485         },
 486         {
 487                 .procname       = "tcp_tw_reuse",
 488                 .data           = &sysctl_tcp_tw_reuse,
 489                 .maxlen         = sizeof(int),
 490                 .mode           = 0644,
 491                 .proc_handler   = proc_dointvec
 492         },
 493         {
 494                 .procname       = "tcp_frto",
 495                 .data           = &sysctl_tcp_frto,
 496                 .maxlen         = sizeof(int),
 497                 .mode           = 0644,
 498                 .proc_handler   = proc_dointvec
 499         },
 500         {
 501                 .procname       = "tcp_frto_response",
 502                 .data           = &sysctl_tcp_frto_response,
 503                 .maxlen         = sizeof(int),
 504                 .mode           = 0644,
 505                 .proc_handler   = proc_dointvec
 506         },
 507         {
 508                 .procname       = "tcp_low_latency",
 509                 .data           = &sysctl_tcp_low_latency,
 510                 .maxlen         = sizeof(int),
 511                 .mode           = 0644,
 512                 .proc_handler   = proc_dointvec
 513         },
 514         {
 515                 .procname       = "tcp_no_metrics_save",
 516                 .data           = &sysctl_tcp_nometrics_save,
 517                 .maxlen         = sizeof(int),
 518                 .mode           = 0644,
 519                 .proc_handler   = proc_dointvec,
 520         },
 521         {
 522                 .procname       = "tcp_moderate_rcvbuf",
 523                 .data           = &sysctl_tcp_moderate_rcvbuf,
 524                 .maxlen         = sizeof(int),
 525                 .mode           = 0644,
 526                 .proc_handler   = proc_dointvec,
 527         },
 528         {
 529                 .procname       = "tcp_tso_win_divisor",
 530                 .data           = &sysctl_tcp_tso_win_divisor,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = proc_dointvec,
 534         },
 535         {
 536                 .procname       = "tcp_congestion_control",
 537                 .mode           = 0644,
 538                 .maxlen         = TCP_CA_NAME_MAX,
 539                 .proc_handler   = proc_tcp_congestion_control,
 540         },
 541         {
 542                 .procname       = "tcp_abc",
 543                 .data           = &sysctl_tcp_abc,
 544                 .maxlen         = sizeof(int),
 545                 .mode           = 0644,
 546                 .proc_handler   = proc_dointvec,
 547         },
 548         {
 549                 .procname       = "tcp_mtu_probing",
 550                 .data           = &sysctl_tcp_mtu_probing,
 551                 .maxlen         = sizeof(int),
 552                 .mode           = 0644,
 553                 .proc_handler   = proc_dointvec,
 554         },
 555         {
 556                 .procname       = "tcp_base_mss",
 557                 .data           = &sysctl_tcp_base_mss,
 558                 .maxlen         = sizeof(int),
 559                 .mode           = 0644,
 560                 .proc_handler   = proc_dointvec,
 561         },
 562         {
 563                 .procname       = "tcp_workaround_signed_windows",
 564                 .data           = &sysctl_tcp_workaround_signed_windows,
 565                 .maxlen         = sizeof(int),
 566                 .mode           = 0644,
 567                 .proc_handler   = proc_dointvec
 568         },
 569 #ifdef CONFIG_NET_DMA
 570         {
 571                 .procname       = "tcp_dma_copybreak",
 572                 .data           = &sysctl_tcp_dma_copybreak,
 573                 .maxlen         = sizeof(int),
 574                 .mode           = 0644,
 575                 .proc_handler   = proc_dointvec
 576         },
 577 #endif
 578         {
 579                 .procname       = "tcp_slow_start_after_idle",
 580                 .data           = &sysctl_tcp_slow_start_after_idle,
 581                 .maxlen         = sizeof(int),
 582                 .mode           = 0644,
 583                 .proc_handler   = proc_dointvec
 584         },
 585 #ifdef CONFIG_NETLABEL
 586         {
 587                 .procname       = "cipso_cache_enable",
 588                 .data           = &cipso_v4_cache_enabled,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = proc_dointvec,
 592         },
 593         {
 594                 .procname       = "cipso_cache_bucket_size",
 595                 .data           = &cipso_v4_cache_bucketsize,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dointvec,
 599         },
 600         {
 601                 .procname       = "cipso_rbm_optfmt",
 602                 .data           = &cipso_v4_rbm_optfmt,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dointvec,
 606         },
 607         {
 608                 .procname       = "cipso_rbm_strictvalid",
 609                 .data           = &cipso_v4_rbm_strictvalid,
 610                 .maxlen         = sizeof(int),
 611                 .mode           = 0644,
 612                 .proc_handler   = proc_dointvec,
 613         },
 614 #endif /* CONFIG_NETLABEL */
 615         {
 616                 .procname       = "tcp_available_congestion_control",
 617                 .maxlen         = TCP_CA_BUF_MAX,
 618                 .mode           = 0444,
 619                 .proc_handler   = proc_tcp_available_congestion_control,
 620         },
 621         {
 622                 .procname       = "tcp_allowed_congestion_control",
 623                 .maxlen         = TCP_CA_BUF_MAX,
 624                 .mode           = 0644,
 625                 .proc_handler   = proc_allowed_congestion_control,
 626         },
 627         {
 628                 .procname       = "tcp_max_ssthresh",
 629                 .data           = &sysctl_tcp_max_ssthresh,
 630                 .maxlen         = sizeof(int),
 631                 .mode           = 0644,
 632                 .proc_handler   = proc_dointvec,
 633         },
 634         {
 635                 .procname       = "tcp_cookie_size",
 636                 .data           = &sysctl_tcp_cookie_size,
 637                 .maxlen         = sizeof(int),
 638                 .mode           = 0644,
 639                 .proc_handler   = proc_dointvec
 640         },
 641         {
 642                 .procname       = "tcp_thin_linear_timeouts",
 643                 .data           = &sysctl_tcp_thin_linear_timeouts,
 644                 .maxlen         = sizeof(int),
 645                 .mode           = 0644,
 646                 .proc_handler   = proc_dointvec
 647         },
 648         {
 649                 .procname       = "tcp_thin_dupack",
 650                 .data           = &sysctl_tcp_thin_dupack,
 651                 .maxlen         = sizeof(int),
 652                 .mode           = 0644,
 653                 .proc_handler   = proc_dointvec
 654         },
 655         {
 656                 .procname       = "udp_mem",
 657                 .data           = &sysctl_udp_mem,
 658                 .maxlen         = sizeof(sysctl_udp_mem),
 659                 .mode           = 0644,
 660                 .proc_handler   = proc_doulongvec_minmax,
 661         },
 662         {
 663                 .procname       = "udp_rmem_min",
 664                 .data           = &sysctl_udp_rmem_min,
 665                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 666                 .mode           = 0644,
 667                 .proc_handler   = proc_dointvec_minmax,
 668                 .extra1         = &zero
 669         },
 670         {
 671                 .procname       = "udp_wmem_min",
 672                 .data           = &sysctl_udp_wmem_min,
 673                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 674                 .mode           = 0644,
 675                 .proc_handler   = proc_dointvec_minmax,
 676                 .extra1         = &zero
 677         },
 678         { }
 679 };
 680
 681 static struct ctl_table ipv4_net_table[] = {
 682         {
 683                 .procname       = "icmp_echo_ignore_all",
 684                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 685                 .maxlen         = sizeof(int),
 686                 .mode           = 0644,
 687                 .proc_handler   = proc_dointvec
 688         },
 689         {
 690                 .procname       = "icmp_echo_ignore_broadcasts",
 691                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 692                 .maxlen         = sizeof(int),
 693                 .mode           = 0644,
 694                 .proc_handler   = proc_dointvec
 695         },
 696         {
 697                 .procname       = "icmp_ignore_bogus_error_responses",
 698                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 699                 .maxlen         = sizeof(int),
 700                 .mode           = 0644,
 701                 .proc_handler   = proc_dointvec
 702         },
 703         {
 704                 .procname       = "icmp_errors_use_inbound_ifaddr",
 705                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 706                 .maxlen         = sizeof(int),
 707                 .mode           = 0644,
 708                 .proc_handler   = proc_dointvec
 709         },
 710         {
 711                 .procname       = "icmp_ratelimit",
 712                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 713                 .maxlen         = sizeof(int),
 714                 .mode           = 0644,
 715                 .proc_handler   = proc_dointvec_ms_jiffies,
 716         },
 717         {
 718                 .procname       = "icmp_ratemask",
 719                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 720                 .maxlen         = sizeof(int),
 721                 .mode           = 0644,
 722                 .proc_handler   = proc_dointvec
 723         },
 724         {
 725                 .procname       = "rt_cache_rebuild_count",
 726                 .data           = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
 727                 .maxlen         = sizeof(int),
 728                 .mode           = 0644,
 729                 .proc_handler   = proc_dointvec
 730         },
 731         {
 732                 .procname       = "ping_group_range",
 733                 .data           = &init_net.ipv4.sysctl_ping_group_range,
 734                 .maxlen         = sizeof(init_net.ipv4.sysctl_ping_group_range),
 735                 .mode           = 0644,
 736                 .proc_handler   = ipv4_ping_group_range,
 737         },
 738         { }
 739 };
 740
 741 struct ctl_path net_ipv4_ctl_path[] = {
 742         { .procname = "net", },
 743         { .procname = "ipv4", },
 744         { },
 745 };
 746 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
 747
 748 static __net_init int ipv4_sysctl_init_net(struct net *net)
 749 {
 750         struct ctl_table *table;
 751
 752         table = ipv4_net_table;
 753         if (!net_eq(net, &init_net)) {
 754                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
 755                 if (table == NULL)
 756                         goto err_alloc;
 757
 758                 table[0].data =
 759                         &net->ipv4.sysctl_icmp_echo_ignore_all;
 760                 table[1].data =
 761                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
 762                 table[2].data =
 763                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
 764                 table[3].data =
 765                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
 766                 table[4].data =
 767                         &net->ipv4.sysctl_icmp_ratelimit;
 768                 table[5].data =
 769                         &net->ipv4.sysctl_icmp_ratemask;
 770                 table[6].data =
 771                         &net->ipv4.sysctl_rt_cache_rebuild_count;
 772                 table[7].data =
 773                         &net->ipv4.sysctl_ping_group_range;
 774
 775         }
 776
 777         /*
 778          * Sane defaults - nobody may create ping sockets.
 779          * Boot scripts should set this to distro-specific group.
 780          */
 781         net->ipv4.sysctl_ping_group_range[0] = 1;
 782         net->ipv4.sysctl_ping_group_range[1] = 0;
 783
 784         net->ipv4.sysctl_rt_cache_rebuild_count = 4;
 785
 786         net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
 787                         net_ipv4_ctl_path, table);
 788         if (net->ipv4.ipv4_hdr == NULL)
 789                 goto err_reg;
 790
 791         return 0;
 792
 793 err_reg:
 794         if (!net_eq(net, &init_net))
 795                 kfree(table);
 796 err_alloc:
 797         return -ENOMEM;
 798 }
 799
 800 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 801 {
 802         struct ctl_table *table;
 803
 804         table = net->ipv4.ipv4_hdr->ctl_table_arg;
 805         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
 806         kfree(table);
 807 }
 808
 809 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 810         .init = ipv4_sysctl_init_net,
 811         .exit = ipv4_sysctl_exit_net,
 812 };
 813
 814 static __init int sysctl_ipv4_init(void)
 815 {
 816         struct ctl_table_header *hdr;
 817         struct ctl_table *i;
 818
 819         for (i = ipv4_table; i->procname; i++) {
 820                 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
 821                         i->data = sysctl_local_reserved_ports;
 822                         break;
 823                 }
 824         }
 825         if (!i->procname)
 826                 return -EINVAL;
 827
 828         hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
 829         if (hdr == NULL)
 830                 return -ENOMEM;
 831
 832         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
 833                 unregister_sysctl_table(hdr);
 834                 return -ENOMEM;
 835         }
 836
 837         return 0;
 838 }
 839
 840 __initcall(sysctl_ipv4_init);