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 <linux/swap.h>
  18 #include <net/snmp.h>
  19 #include <net/icmp.h>
  20 #include <net/ip.h>
  21 #include <net/route.h>
  22 #include <net/tcp.h>
  23 #include <net/udp.h>
  24 #include <net/cipso_ipv4.h>
  25 #include <net/inet_frag.h>
  26 #include <net/ping.h>
  27 #include <net/tcp_memcontrol.h>
  28
  29 static int zero;
  30 static int two = 2;
  31 static int tcp_retr1_max = 255;
  32 static int ip_local_port_range_min[] = { 1, 1 };
  33 static int ip_local_port_range_max[] = { 65535, 65535 };
  34 static int tcp_adv_win_scale_min = -31;
  35 static int tcp_adv_win_scale_max = 31;
  36 static int ip_ttl_min = 1;
  37 static int ip_ttl_max = 255;
  38 static int ip_ping_group_range_min[] = { 0, 0 };
  39 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  40
  41 /* Update system visible IP port range */
  42 static void set_local_port_range(int range[2])
  43 {
  44         write_seqlock(&sysctl_local_ports.lock);
  45         sysctl_local_ports.range[0] = range[0];
  46         sysctl_local_ports.range[1] = range[1];
  47         write_sequnlock(&sysctl_local_ports.lock);
  48 }
  49
  50 /* Validate changes from /proc interface. */
  51 static int ipv4_local_port_range(ctl_table *table, int write,
  52                                  void __user *buffer,
  53                                  size_t *lenp, loff_t *ppos)
  54 {
  55         int ret;
  56         int range[2];
  57         ctl_table tmp = {
  58                 .data = &range,
  59                 .maxlen = sizeof(range),
  60                 .mode = table->mode,
  61                 .extra1 = &ip_local_port_range_min,
  62                 .extra2 = &ip_local_port_range_max,
  63         };
  64
  65         inet_get_local_port_range(range, range + 1);
  66         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  67
  68         if (write && ret == 0) {
  69                 if (range[1] < range[0])
  70                         ret = -EINVAL;
  71                 else
  72                         set_local_port_range(range);
  73         }
  74
  75         return ret;
  76 }
  77
  78
  79 static void inet_get_ping_group_range_table(struct ctl_table *table, gid_t *low, gid_t *high)
  80 {
  81         gid_t *data = table->data;
  82         unsigned int seq;
  83         do {
  84                 seq = read_seqbegin(&sysctl_local_ports.lock);
  85
  86                 *low = data[0];
  87                 *high = data[1];
  88         } while (read_seqretry(&sysctl_local_ports.lock, seq));
  89 }
  90
  91 /* Update system visible IP port range */
  92 static void set_ping_group_range(struct ctl_table *table, gid_t range[2])
  93 {
  94         gid_t *data = table->data;
  95         write_seqlock(&sysctl_local_ports.lock);
  96         data[0] = range[0];
  97         data[1] = range[1];
  98         write_sequnlock(&sysctl_local_ports.lock);
  99 }
 100
 101 /* Validate changes from /proc interface. */
 102 static int ipv4_ping_group_range(ctl_table *table, int write,
 103                                  void __user *buffer,
 104                                  size_t *lenp, loff_t *ppos)
 105 {
 106         int ret;
 107         gid_t range[2];
 108         ctl_table tmp = {
 109                 .data = &range,
 110                 .maxlen = sizeof(range),
 111                 .mode = table->mode,
 112                 .extra1 = &ip_ping_group_range_min,
 113                 .extra2 = &ip_ping_group_range_max,
 114         };
 115
 116         inet_get_ping_group_range_table(table, range, range + 1);
 117         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 118
 119         if (write && ret == 0)
 120                 set_ping_group_range(table, range);
 121
 122         return ret;
 123 }
 124
 125 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
 126                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 127 {
 128         char val[TCP_CA_NAME_MAX];
 129         ctl_table tbl = {
 130                 .data = val,
 131                 .maxlen = TCP_CA_NAME_MAX,
 132         };
 133         int ret;
 134
 135         tcp_get_default_congestion_control(val);
 136
 137         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 138         if (write && ret == 0)
 139                 ret = tcp_set_default_congestion_control(val);
 140         return ret;
 141 }
 142
 143 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 144                                                  int write,
 145                                                  void __user *buffer, size_t *lenp,
 146                                                  loff_t *ppos)
 147 {
 148         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 149         int ret;
 150
 151         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 152         if (!tbl.data)
 153                 return -ENOMEM;
 154         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 155         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 156         kfree(tbl.data);
 157         return ret;
 158 }
 159
 160 static int proc_allowed_congestion_control(ctl_table *ctl,
 161                                            int write,
 162                                            void __user *buffer, size_t *lenp,
 163                                            loff_t *ppos)
 164 {
 165         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 166         int ret;
 167
 168         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 169         if (!tbl.data)
 170                 return -ENOMEM;
 171
 172         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 173         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 174         if (write && ret == 0)
 175                 ret = tcp_set_allowed_congestion_control(tbl.data);
 176         kfree(tbl.data);
 177         return ret;
 178 }
 179
 180 static int ipv4_tcp_mem(ctl_table *ctl, int write,
 181                            void __user *buffer, size_t *lenp,
 182                            loff_t *ppos)
 183 {
 184         int ret;
 185         unsigned long vec[3];
 186         struct net *net = current->nsproxy->net_ns;
 187 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
 188         struct mem_cgroup *memcg;
 189 #endif
 190
 191         ctl_table tmp = {
 192                 .data = &vec,
 193                 .maxlen = sizeof(vec),
 194                 .mode = ctl->mode,
 195         };
 196
 197         if (!write) {
 198                 ctl->data = &net->ipv4.sysctl_tcp_mem;
 199                 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
 200         }
 201
 202         ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
 203         if (ret)
 204                 return ret;
 205
 206 #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
 207         rcu_read_lock();
 208         memcg = mem_cgroup_from_task(current);
 209
 210         tcp_prot_mem(memcg, vec[0], 0);
 211         tcp_prot_mem(memcg, vec[1], 1);
 212         tcp_prot_mem(memcg, vec[2], 2);
 213         rcu_read_unlock();
 214 #endif
 215
 216         net->ipv4.sysctl_tcp_mem[0] = vec[0];
 217         net->ipv4.sysctl_tcp_mem[1] = vec[1];
 218         net->ipv4.sysctl_tcp_mem[2] = vec[2];
 219
 220         return 0;
 221 }
 222
 223 static struct ctl_table ipv4_table[] = {
 224         {
 225                 .procname       = "tcp_timestamps",
 226                 .data           = &sysctl_tcp_timestamps,
 227                 .maxlen         = sizeof(int),
 228                 .mode           = 0644,
 229                 .proc_handler   = proc_dointvec
 230         },
 231         {
 232                 .procname       = "tcp_window_scaling",
 233                 .data           = &sysctl_tcp_window_scaling,
 234                 .maxlen         = sizeof(int),
 235                 .mode           = 0644,
 236                 .proc_handler   = proc_dointvec
 237         },
 238         {
 239                 .procname       = "tcp_sack",
 240                 .data           = &sysctl_tcp_sack,
 241                 .maxlen         = sizeof(int),
 242                 .mode           = 0644,
 243                 .proc_handler   = proc_dointvec
 244         },
 245         {
 246                 .procname       = "tcp_retrans_collapse",
 247                 .data           = &sysctl_tcp_retrans_collapse,
 248                 .maxlen         = sizeof(int),
 249                 .mode           = 0644,
 250                 .proc_handler   = proc_dointvec
 251         },
 252         {
 253                 .procname       = "ip_default_ttl",
 254                 .data           = &sysctl_ip_default_ttl,
 255                 .maxlen         = sizeof(int),
 256                 .mode           = 0644,
 257                 .proc_handler   = proc_dointvec_minmax,
 258                 .extra1         = &ip_ttl_min,
 259                 .extra2         = &ip_ttl_max,
 260         },
 261         {
 262                 .procname       = "ip_no_pmtu_disc",
 263                 .data           = &ipv4_config.no_pmtu_disc,
 264                 .maxlen         = sizeof(int),
 265                 .mode           = 0644,
 266                 .proc_handler   = proc_dointvec
 267         },
 268         {
 269                 .procname       = "ip_nonlocal_bind",
 270                 .data           = &sysctl_ip_nonlocal_bind,
 271                 .maxlen         = sizeof(int),
 272                 .mode           = 0644,
 273                 .proc_handler   = proc_dointvec
 274         },
 275         {
 276                 .procname       = "tcp_syn_retries",
 277                 .data           = &sysctl_tcp_syn_retries,
 278                 .maxlen         = sizeof(int),
 279                 .mode           = 0644,
 280                 .proc_handler   = proc_dointvec
 281         },
 282         {
 283                 .procname       = "tcp_synack_retries",
 284                 .data           = &sysctl_tcp_synack_retries,
 285                 .maxlen         = sizeof(int),
 286                 .mode           = 0644,
 287                 .proc_handler   = proc_dointvec
 288         },
 289         {
 290                 .procname       = "tcp_max_orphans",
 291                 .data           = &sysctl_tcp_max_orphans,
 292                 .maxlen         = sizeof(int),
 293                 .mode           = 0644,
 294                 .proc_handler   = proc_dointvec
 295         },
 296         {
 297                 .procname       = "tcp_max_tw_buckets",
 298                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 299                 .maxlen         = sizeof(int),
 300                 .mode           = 0644,
 301                 .proc_handler   = proc_dointvec
 302         },
 303         {
 304                 .procname       = "ip_early_demux",
 305                 .data           = &sysctl_ip_early_demux,
 306                 .maxlen         = sizeof(int),
 307                 .mode           = 0644,
 308                 .proc_handler   = proc_dointvec
 309         },
 310         {
 311                 .procname       = "ip_dynaddr",
 312                 .data           = &sysctl_ip_dynaddr,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = proc_dointvec
 316         },
 317         {
 318                 .procname       = "tcp_keepalive_time",
 319                 .data           = &sysctl_tcp_keepalive_time,
 320                 .maxlen         = sizeof(int),
 321                 .mode           = 0644,
 322                 .proc_handler   = proc_dointvec_jiffies,
 323         },
 324         {
 325                 .procname       = "tcp_keepalive_probes",
 326                 .data           = &sysctl_tcp_keepalive_probes,
 327                 .maxlen         = sizeof(int),
 328                 .mode           = 0644,
 329                 .proc_handler   = proc_dointvec
 330         },
 331         {
 332                 .procname       = "tcp_keepalive_intvl",
 333                 .data           = &sysctl_tcp_keepalive_intvl,
 334                 .maxlen         = sizeof(int),
 335                 .mode           = 0644,
 336                 .proc_handler   = proc_dointvec_jiffies,
 337         },
 338         {
 339                 .procname       = "tcp_retries1",
 340                 .data           = &sysctl_tcp_retries1,
 341                 .maxlen         = sizeof(int),
 342                 .mode           = 0644,
 343                 .proc_handler   = proc_dointvec_minmax,
 344                 .extra2         = &tcp_retr1_max
 345         },
 346         {
 347                 .procname       = "tcp_retries2",
 348                 .data           = &sysctl_tcp_retries2,
 349                 .maxlen         = sizeof(int),
 350                 .mode           = 0644,
 351                 .proc_handler   = proc_dointvec
 352         },
 353         {
 354                 .procname       = "tcp_fin_timeout",
 355                 .data           = &sysctl_tcp_fin_timeout,
 356                 .maxlen         = sizeof(int),
 357                 .mode           = 0644,
 358                 .proc_handler   = proc_dointvec_jiffies,
 359         },
 360 #ifdef CONFIG_SYN_COOKIES
 361         {
 362                 .procname       = "tcp_syncookies",
 363                 .data           = &sysctl_tcp_syncookies,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = proc_dointvec
 367         },
 368 #endif
 369         {
 370                 .procname       = "tcp_tw_recycle",
 371                 .data           = &tcp_death_row.sysctl_tw_recycle,
 372                 .maxlen         = sizeof(int),
 373                 .mode           = 0644,
 374                 .proc_handler   = proc_dointvec
 375         },
 376         {
 377                 .procname       = "tcp_abort_on_overflow",
 378                 .data           = &sysctl_tcp_abort_on_overflow,
 379                 .maxlen         = sizeof(int),
 380                 .mode           = 0644,
 381                 .proc_handler   = proc_dointvec
 382         },
 383         {
 384                 .procname       = "tcp_stdurg",
 385                 .data           = &sysctl_tcp_stdurg,
 386                 .maxlen         = sizeof(int),
 387                 .mode           = 0644,
 388                 .proc_handler   = proc_dointvec
 389         },
 390         {
 391                 .procname       = "tcp_rfc1337",
 392                 .data           = &sysctl_tcp_rfc1337,
 393                 .maxlen         = sizeof(int),
 394                 .mode           = 0644,
 395                 .proc_handler   = proc_dointvec
 396         },
 397         {
 398                 .procname       = "tcp_max_syn_backlog",
 399                 .data           = &sysctl_max_syn_backlog,
 400                 .maxlen         = sizeof(int),
 401                 .mode           = 0644,
 402                 .proc_handler   = proc_dointvec
 403         },
 404         {
 405                 .procname       = "ip_local_port_range",
 406                 .data           = &sysctl_local_ports.range,
 407                 .maxlen         = sizeof(sysctl_local_ports.range),
 408                 .mode           = 0644,
 409                 .proc_handler   = ipv4_local_port_range,
 410         },
 411         {
 412                 .procname       = "ip_local_reserved_ports",
 413                 .data           = NULL, /* initialized in sysctl_ipv4_init */
 414                 .maxlen         = 65536,
 415                 .mode           = 0644,
 416                 .proc_handler   = proc_do_large_bitmap,
 417         },
 418         {
 419                 .procname       = "igmp_max_memberships",
 420                 .data           = &sysctl_igmp_max_memberships,
 421                 .maxlen         = sizeof(int),
 422                 .mode           = 0644,
 423                 .proc_handler   = proc_dointvec
 424         },
 425         {
 426                 .procname       = "igmp_max_msf",
 427                 .data           = &sysctl_igmp_max_msf,
 428                 .maxlen         = sizeof(int),
 429                 .mode           = 0644,
 430                 .proc_handler   = proc_dointvec
 431         },
 432         {
 433                 .procname       = "inet_peer_threshold",
 434                 .data           = &inet_peer_threshold,
 435                 .maxlen         = sizeof(int),
 436                 .mode           = 0644,
 437                 .proc_handler   = proc_dointvec
 438         },
 439         {
 440                 .procname       = "inet_peer_minttl",
 441                 .data           = &inet_peer_minttl,
 442                 .maxlen         = sizeof(int),
 443                 .mode           = 0644,
 444                 .proc_handler   = proc_dointvec_jiffies,
 445         },
 446         {
 447                 .procname       = "inet_peer_maxttl",
 448                 .data           = &inet_peer_maxttl,
 449                 .maxlen         = sizeof(int),
 450                 .mode           = 0644,
 451                 .proc_handler   = proc_dointvec_jiffies,
 452         },
 453         {
 454                 .procname       = "tcp_orphan_retries",
 455                 .data           = &sysctl_tcp_orphan_retries,
 456                 .maxlen         = sizeof(int),
 457                 .mode           = 0644,
 458                 .proc_handler   = proc_dointvec
 459         },
 460         {
 461                 .procname       = "tcp_fack",
 462                 .data           = &sysctl_tcp_fack,
 463                 .maxlen         = sizeof(int),
 464                 .mode           = 0644,
 465                 .proc_handler   = proc_dointvec
 466         },
 467         {
 468                 .procname       = "tcp_reordering",
 469                 .data           = &sysctl_tcp_reordering,
 470                 .maxlen         = sizeof(int),
 471                 .mode           = 0644,
 472                 .proc_handler   = proc_dointvec
 473         },
 474         {
 475                 .procname       = "tcp_ecn",
 476                 .data           = &sysctl_tcp_ecn,
 477                 .maxlen         = sizeof(int),
 478                 .mode           = 0644,
 479                 .proc_handler   = proc_dointvec
 480         },
 481         {
 482                 .procname       = "tcp_dsack",
 483                 .data           = &sysctl_tcp_dsack,
 484                 .maxlen         = sizeof(int),
 485                 .mode           = 0644,
 486                 .proc_handler   = proc_dointvec
 487         },
 488         {
 489                 .procname       = "tcp_wmem",
 490                 .data           = &sysctl_tcp_wmem,
 491                 .maxlen         = sizeof(sysctl_tcp_wmem),
 492                 .mode           = 0644,
 493                 .proc_handler   = proc_dointvec
 494         },
 495         {
 496                 .procname       = "tcp_rmem",
 497                 .data           = &sysctl_tcp_rmem,
 498                 .maxlen         = sizeof(sysctl_tcp_rmem),
 499                 .mode           = 0644,
 500                 .proc_handler   = proc_dointvec
 501         },
 502         {
 503                 .procname       = "tcp_app_win",
 504                 .data           = &sysctl_tcp_app_win,
 505                 .maxlen         = sizeof(int),
 506                 .mode           = 0644,
 507                 .proc_handler   = proc_dointvec
 508         },
 509         {
 510                 .procname       = "tcp_adv_win_scale",
 511                 .data           = &sysctl_tcp_adv_win_scale,
 512                 .maxlen         = sizeof(int),
 513                 .mode           = 0644,
 514                 .proc_handler   = proc_dointvec_minmax,
 515                 .extra1         = &tcp_adv_win_scale_min,
 516                 .extra2         = &tcp_adv_win_scale_max,
 517         },
 518         {
 519                 .procname       = "tcp_tw_reuse",
 520                 .data           = &sysctl_tcp_tw_reuse,
 521                 .maxlen         = sizeof(int),
 522                 .mode           = 0644,
 523                 .proc_handler   = proc_dointvec
 524         },
 525         {
 526                 .procname       = "tcp_frto",
 527                 .data           = &sysctl_tcp_frto,
 528                 .maxlen         = sizeof(int),
 529                 .mode           = 0644,
 530                 .proc_handler   = proc_dointvec
 531         },
 532         {
 533                 .procname       = "tcp_frto_response",
 534                 .data           = &sysctl_tcp_frto_response,
 535                 .maxlen         = sizeof(int),
 536                 .mode           = 0644,
 537                 .proc_handler   = proc_dointvec
 538         },
 539         {
 540                 .procname       = "tcp_low_latency",
 541                 .data           = &sysctl_tcp_low_latency,
 542                 .maxlen         = sizeof(int),
 543                 .mode           = 0644,
 544                 .proc_handler   = proc_dointvec
 545         },
 546         {
 547                 .procname       = "tcp_no_metrics_save",
 548                 .data           = &sysctl_tcp_nometrics_save,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = proc_dointvec,
 552         },
 553         {
 554                 .procname       = "tcp_moderate_rcvbuf",
 555                 .data           = &sysctl_tcp_moderate_rcvbuf,
 556                 .maxlen         = sizeof(int),
 557                 .mode           = 0644,
 558                 .proc_handler   = proc_dointvec,
 559         },
 560         {
 561                 .procname       = "tcp_tso_win_divisor",
 562                 .data           = &sysctl_tcp_tso_win_divisor,
 563                 .maxlen         = sizeof(int),
 564                 .mode           = 0644,
 565                 .proc_handler   = proc_dointvec,
 566         },
 567         {
 568                 .procname       = "tcp_congestion_control",
 569                 .mode           = 0644,
 570                 .maxlen         = TCP_CA_NAME_MAX,
 571                 .proc_handler   = proc_tcp_congestion_control,
 572         },
 573         {
 574                 .procname       = "tcp_abc",
 575                 .data           = &sysctl_tcp_abc,
 576                 .maxlen         = sizeof(int),
 577                 .mode           = 0644,
 578                 .proc_handler   = proc_dointvec,
 579         },
 580         {
 581                 .procname       = "tcp_mtu_probing",
 582                 .data           = &sysctl_tcp_mtu_probing,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = proc_dointvec,
 586         },
 587         {
 588                 .procname       = "tcp_base_mss",
 589                 .data           = &sysctl_tcp_base_mss,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = proc_dointvec,
 593         },
 594         {
 595                 .procname       = "tcp_workaround_signed_windows",
 596                 .data           = &sysctl_tcp_workaround_signed_windows,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = proc_dointvec
 600         },
 601 #ifdef CONFIG_NET_DMA
 602         {
 603                 .procname       = "tcp_dma_copybreak",
 604                 .data           = &sysctl_tcp_dma_copybreak,
 605                 .maxlen         = sizeof(int),
 606                 .mode           = 0644,
 607                 .proc_handler   = proc_dointvec
 608         },
 609 #endif
 610         {
 611                 .procname       = "tcp_slow_start_after_idle",
 612                 .data           = &sysctl_tcp_slow_start_after_idle,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = proc_dointvec
 616         },
 617 #ifdef CONFIG_NETLABEL
 618         {
 619                 .procname       = "cipso_cache_enable",
 620                 .data           = &cipso_v4_cache_enabled,
 621                 .maxlen         = sizeof(int),
 622                 .mode           = 0644,
 623                 .proc_handler   = proc_dointvec,
 624         },
 625         {
 626                 .procname       = "cipso_cache_bucket_size",
 627                 .data           = &cipso_v4_cache_bucketsize,
 628                 .maxlen         = sizeof(int),
 629                 .mode           = 0644,
 630                 .proc_handler   = proc_dointvec,
 631         },
 632         {
 633                 .procname       = "cipso_rbm_optfmt",
 634                 .data           = &cipso_v4_rbm_optfmt,
 635                 .maxlen         = sizeof(int),
 636                 .mode           = 0644,
 637                 .proc_handler   = proc_dointvec,
 638         },
 639         {
 640                 .procname       = "cipso_rbm_strictvalid",
 641                 .data           = &cipso_v4_rbm_strictvalid,
 642                 .maxlen         = sizeof(int),
 643                 .mode           = 0644,
 644                 .proc_handler   = proc_dointvec,
 645         },
 646 #endif /* CONFIG_NETLABEL */
 647         {
 648                 .procname       = "tcp_available_congestion_control",
 649                 .maxlen         = TCP_CA_BUF_MAX,
 650                 .mode           = 0444,
 651                 .proc_handler   = proc_tcp_available_congestion_control,
 652         },
 653         {
 654                 .procname       = "tcp_allowed_congestion_control",
 655                 .maxlen         = TCP_CA_BUF_MAX,
 656                 .mode           = 0644,
 657                 .proc_handler   = proc_allowed_congestion_control,
 658         },
 659         {
 660                 .procname       = "tcp_max_ssthresh",
 661                 .data           = &sysctl_tcp_max_ssthresh,
 662                 .maxlen         = sizeof(int),
 663                 .mode           = 0644,
 664                 .proc_handler   = proc_dointvec,
 665         },
 666         {
 667                 .procname       = "tcp_cookie_size",
 668                 .data           = &sysctl_tcp_cookie_size,
 669                 .maxlen         = sizeof(int),
 670                 .mode           = 0644,
 671                 .proc_handler   = proc_dointvec
 672         },
 673         {
 674                 .procname       = "tcp_thin_linear_timeouts",
 675                 .data           = &sysctl_tcp_thin_linear_timeouts,
 676                 .maxlen         = sizeof(int),
 677                 .mode           = 0644,
 678                 .proc_handler   = proc_dointvec
 679         },
 680         {
 681                 .procname       = "tcp_thin_dupack",
 682                 .data           = &sysctl_tcp_thin_dupack,
 683                 .maxlen         = sizeof(int),
 684                 .mode           = 0644,
 685                 .proc_handler   = proc_dointvec
 686         },
 687         {
 688                 .procname       = "tcp_early_retrans",
 689                 .data           = &sysctl_tcp_early_retrans,
 690                 .maxlen         = sizeof(int),
 691                 .mode           = 0644,
 692                 .proc_handler   = proc_dointvec_minmax,
 693                 .extra1         = &zero,
 694                 .extra2         = &two,
 695         },
 696         {
 697                 .procname       = "udp_mem",
 698                 .data           = &sysctl_udp_mem,
 699                 .maxlen         = sizeof(sysctl_udp_mem),
 700                 .mode           = 0644,
 701                 .proc_handler   = proc_doulongvec_minmax,
 702         },
 703         {
 704                 .procname       = "udp_rmem_min",
 705                 .data           = &sysctl_udp_rmem_min,
 706                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 707                 .mode           = 0644,
 708                 .proc_handler   = proc_dointvec_minmax,
 709                 .extra1         = &zero
 710         },
 711         {
 712                 .procname       = "udp_wmem_min",
 713                 .data           = &sysctl_udp_wmem_min,
 714                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 715                 .mode           = 0644,
 716                 .proc_handler   = proc_dointvec_minmax,
 717                 .extra1         = &zero
 718         },
 719         { }
 720 };
 721
 722 static struct ctl_table ipv4_net_table[] = {
 723         {
 724                 .procname       = "icmp_echo_ignore_all",
 725                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 726                 .maxlen         = sizeof(int),
 727                 .mode           = 0644,
 728                 .proc_handler   = proc_dointvec
 729         },
 730         {
 731                 .procname       = "icmp_echo_ignore_broadcasts",
 732                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 733                 .maxlen         = sizeof(int),
 734                 .mode           = 0644,
 735                 .proc_handler   = proc_dointvec
 736         },
 737         {
 738                 .procname       = "icmp_ignore_bogus_error_responses",
 739                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 740                 .maxlen         = sizeof(int),
 741                 .mode           = 0644,
 742                 .proc_handler   = proc_dointvec
 743         },
 744         {
 745                 .procname       = "icmp_errors_use_inbound_ifaddr",
 746                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 747                 .maxlen         = sizeof(int),
 748                 .mode           = 0644,
 749                 .proc_handler   = proc_dointvec
 750         },
 751         {
 752                 .procname       = "icmp_ratelimit",
 753                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 754                 .maxlen         = sizeof(int),
 755                 .mode           = 0644,
 756                 .proc_handler   = proc_dointvec_ms_jiffies,
 757         },
 758         {
 759                 .procname       = "icmp_ratemask",
 760                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 761                 .maxlen         = sizeof(int),
 762                 .mode           = 0644,
 763                 .proc_handler   = proc_dointvec
 764         },
 765         {
 766                 .procname       = "rt_cache_rebuild_count",
 767                 .data           = &init_net.ipv4.sysctl_rt_cache_rebuild_count,
 768                 .maxlen         = sizeof(int),
 769                 .mode           = 0644,
 770                 .proc_handler   = proc_dointvec
 771         },
 772         {
 773                 .procname       = "ping_group_range",
 774                 .data           = &init_net.ipv4.sysctl_ping_group_range,
 775                 .maxlen         = sizeof(init_net.ipv4.sysctl_ping_group_range),
 776                 .mode           = 0644,
 777                 .proc_handler   = ipv4_ping_group_range,
 778         },
 779         {
 780                 .procname       = "tcp_mem",
 781                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_mem),
 782                 .mode           = 0644,
 783                 .proc_handler   = ipv4_tcp_mem,
 784         },
 785         { }
 786 };
 787
 788 static __net_init int ipv4_sysctl_init_net(struct net *net)
 789 {
 790         struct ctl_table *table;
 791
 792         table = ipv4_net_table;
 793         if (!net_eq(net, &init_net)) {
 794                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
 795                 if (table == NULL)
 796                         goto err_alloc;
 797
 798                 table[0].data =
 799                         &net->ipv4.sysctl_icmp_echo_ignore_all;
 800                 table[1].data =
 801                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
 802                 table[2].data =
 803                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
 804                 table[3].data =
 805                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
 806                 table[4].data =
 807                         &net->ipv4.sysctl_icmp_ratelimit;
 808                 table[5].data =
 809                         &net->ipv4.sysctl_icmp_ratemask;
 810                 table[6].data =
 811                         &net->ipv4.sysctl_rt_cache_rebuild_count;
 812                 table[7].data =
 813                         &net->ipv4.sysctl_ping_group_range;
 814
 815         }
 816
 817         /*
 818          * Sane defaults - nobody may create ping sockets.
 819          * Boot scripts should set this to distro-specific group.
 820          */
 821         net->ipv4.sysctl_ping_group_range[0] = 1;
 822         net->ipv4.sysctl_ping_group_range[1] = 0;
 823
 824         net->ipv4.sysctl_rt_cache_rebuild_count = 4;
 825
 826         tcp_init_mem(net);
 827
 828         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
 829         if (net->ipv4.ipv4_hdr == NULL)
 830                 goto err_reg;
 831
 832         return 0;
 833
 834 err_reg:
 835         if (!net_eq(net, &init_net))
 836                 kfree(table);
 837 err_alloc:
 838         return -ENOMEM;
 839 }
 840
 841 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 842 {
 843         struct ctl_table *table;
 844
 845         table = net->ipv4.ipv4_hdr->ctl_table_arg;
 846         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
 847         kfree(table);
 848 }
 849
 850 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 851         .init = ipv4_sysctl_init_net,
 852         .exit = ipv4_sysctl_exit_net,
 853 };
 854
 855 static __init int sysctl_ipv4_init(void)
 856 {
 857         struct ctl_table_header *hdr;
 858         struct ctl_table *i;
 859
 860         for (i = ipv4_table; i->procname; i++) {
 861                 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
 862                         i->data = sysctl_local_reserved_ports;
 863                         break;
 864                 }
 865         }
 866         if (!i->procname)
 867                 return -EINVAL;
 868
 869         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
 870         if (hdr == NULL)
 871                 return -ENOMEM;
 872
 873         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
 874                 unregister_net_sysctl_table(hdr);
 875                 return -ENOMEM;
 876         }
 877
 878         return 0;
 879 }
 880
 881 __initcall(sysctl_ipv4_init);