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   1 /*
   2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   3  *
   4  * Begun April 1, 1996, Mike Shaver.
   5  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   6  */
   7
   8 #include <linux/mm.h>
   9 #include <linux/module.h>
  10 #include <linux/sysctl.h>
  11 #include <linux/igmp.h>
  12 #include <linux/inetdevice.h>
  13 #include <linux/seqlock.h>
  14 #include <linux/init.h>
  15 #include <net/snmp.h>
  16 #include <net/icmp.h>
  17 #include <net/ip.h>
  18 #include <net/route.h>
  19 #include <net/tcp.h>
  20 #include <net/udp.h>
  21 #include <net/cipso_ipv4.h>
  22 #include <net/inet_frag.h>
  23
  24 static int zero;
  25 static int tcp_retr1_max = 255;
  26 static int ip_local_port_range_min[] = { 1, 1 };
  27 static int ip_local_port_range_max[] = { 65535, 65535 };
  28
  29 extern seqlock_t sysctl_port_range_lock;
  30 extern int sysctl_local_port_range[2];
  31
  32 /* Update system visible IP port range */
  33 static void set_local_port_range(int range[2])
  34 {
  35         write_seqlock(&sysctl_port_range_lock);
  36         sysctl_local_port_range[0] = range[0];
  37         sysctl_local_port_range[1] = range[1];
  38         write_sequnlock(&sysctl_port_range_lock);
  39 }
  40
  41 /* Validate changes from /proc interface. */
  42 static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
  43                                  void __user *buffer,
  44                                  size_t *lenp, loff_t *ppos)
  45 {
  46         int ret;
  47         int range[2] = { sysctl_local_port_range[0],
  48                          sysctl_local_port_range[1] };
  49         ctl_table tmp = {
  50                 .data = &range,
  51                 .maxlen = sizeof(range),
  52                 .mode = table->mode,
  53                 .extra1 = &ip_local_port_range_min,
  54                 .extra2 = &ip_local_port_range_max,
  55         };
  56
  57         ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
  58
  59         if (write && ret == 0) {
  60                 if (range[1] < range[0])
  61                         ret = -EINVAL;
  62                 else
  63                         set_local_port_range(range);
  64         }
  65
  66         return ret;
  67 }
  68
  69 /* Validate changes from sysctl interface. */
  70 static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
  71                                          int nlen, void __user *oldval,
  72                                          size_t __user *oldlenp,
  73                                         void __user *newval, size_t newlen)
  74 {
  75         int ret;
  76         int range[2] = { sysctl_local_port_range[0],
  77                          sysctl_local_port_range[1] };
  78         ctl_table tmp = {
  79                 .data = &range,
  80                 .maxlen = sizeof(range),
  81                 .mode = table->mode,
  82                 .extra1 = &ip_local_port_range_min,
  83                 .extra2 = &ip_local_port_range_max,
  84         };
  85
  86         ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
  87         if (ret == 0 && newval && newlen) {
  88                 if (range[1] < range[0])
  89                         ret = -EINVAL;
  90                 else
  91                         set_local_port_range(range);
  92         }
  93         return ret;
  94 }
  95
  96
  97 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
  98                                        void __user *buffer, size_t *lenp, loff_t *ppos)
  99 {
 100         char val[TCP_CA_NAME_MAX];
 101         ctl_table tbl = {
 102                 .data = val,
 103                 .maxlen = TCP_CA_NAME_MAX,
 104         };
 105         int ret;
 106
 107         tcp_get_default_congestion_control(val);
 108
 109         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 110         if (write && ret == 0)
 111                 ret = tcp_set_default_congestion_control(val);
 112         return ret;
 113 }
 114
 115 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
 116                                          int nlen, void __user *oldval,
 117                                          size_t __user *oldlenp,
 118                                          void __user *newval, size_t newlen)
 119 {
 120         char val[TCP_CA_NAME_MAX];
 121         ctl_table tbl = {
 122                 .data = val,
 123                 .maxlen = TCP_CA_NAME_MAX,
 124         };
 125         int ret;
 126
 127         tcp_get_default_congestion_control(val);
 128         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 129         if (ret == 1 && newval && newlen)
 130                 ret = tcp_set_default_congestion_control(val);
 131         return ret;
 132 }
 133
 134 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 135                                                  int write, struct file * filp,
 136                                                  void __user *buffer, size_t *lenp,
 137                                                  loff_t *ppos)
 138 {
 139         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 140         int ret;
 141
 142         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 143         if (!tbl.data)
 144                 return -ENOMEM;
 145         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 146         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 147         kfree(tbl.data);
 148         return ret;
 149 }
 150
 151 static int proc_allowed_congestion_control(ctl_table *ctl,
 152                                            int write, struct file * filp,
 153                                            void __user *buffer, size_t *lenp,
 154                                            loff_t *ppos)
 155 {
 156         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 157         int ret;
 158
 159         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 160         if (!tbl.data)
 161                 return -ENOMEM;
 162
 163         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 164         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 165         if (write && ret == 0)
 166                 ret = tcp_set_allowed_congestion_control(tbl.data);
 167         kfree(tbl.data);
 168         return ret;
 169 }
 170
 171 static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
 172                                                int nlen, void __user *oldval,
 173                                                size_t __user *oldlenp,
 174                                                void __user *newval,
 175                                                size_t newlen)
 176 {
 177         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 178         int ret;
 179
 180         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 181         if (!tbl.data)
 182                 return -ENOMEM;
 183
 184         tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
 185         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 186         if (ret == 1 && newval && newlen)
 187                 ret = tcp_set_allowed_congestion_control(tbl.data);
 188         kfree(tbl.data);
 189
 190         return ret;
 191
 192 }
 193
 194 static struct ctl_table ipv4_table[] = {
 195         {
 196                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 197                 .procname       = "tcp_timestamps",
 198                 .data           = &sysctl_tcp_timestamps,
 199                 .maxlen         = sizeof(int),
 200                 .mode           = 0644,
 201                 .proc_handler   = &proc_dointvec
 202         },
 203         {
 204                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 205                 .procname       = "tcp_window_scaling",
 206                 .data           = &sysctl_tcp_window_scaling,
 207                 .maxlen         = sizeof(int),
 208                 .mode           = 0644,
 209                 .proc_handler   = &proc_dointvec
 210         },
 211         {
 212                 .ctl_name       = NET_IPV4_TCP_SACK,
 213                 .procname       = "tcp_sack",
 214                 .data           = &sysctl_tcp_sack,
 215                 .maxlen         = sizeof(int),
 216                 .mode           = 0644,
 217                 .proc_handler   = &proc_dointvec
 218         },
 219         {
 220                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 221                 .procname       = "tcp_retrans_collapse",
 222                 .data           = &sysctl_tcp_retrans_collapse,
 223                 .maxlen         = sizeof(int),
 224                 .mode           = 0644,
 225                 .proc_handler   = &proc_dointvec
 226         },
 227         {
 228                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 229                 .procname       = "ip_default_ttl",
 230                 .data           = &sysctl_ip_default_ttl,
 231                 .maxlen         = sizeof(int),
 232                 .mode           = 0644,
 233                 .proc_handler   = &ipv4_doint_and_flush,
 234                 .strategy       = &ipv4_doint_and_flush_strategy,
 235         },
 236         {
 237                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 238                 .procname       = "ip_no_pmtu_disc",
 239                 .data           = &ipv4_config.no_pmtu_disc,
 240                 .maxlen         = sizeof(int),
 241                 .mode           = 0644,
 242                 .proc_handler   = &proc_dointvec
 243         },
 244         {
 245                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 246                 .procname       = "ip_nonlocal_bind",
 247                 .data           = &sysctl_ip_nonlocal_bind,
 248                 .maxlen         = sizeof(int),
 249                 .mode           = 0644,
 250                 .proc_handler   = &proc_dointvec
 251         },
 252         {
 253                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 254                 .procname       = "tcp_syn_retries",
 255                 .data           = &sysctl_tcp_syn_retries,
 256                 .maxlen         = sizeof(int),
 257                 .mode           = 0644,
 258                 .proc_handler   = &proc_dointvec
 259         },
 260         {
 261                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 262                 .procname       = "tcp_synack_retries",
 263                 .data           = &sysctl_tcp_synack_retries,
 264                 .maxlen         = sizeof(int),
 265                 .mode           = 0644,
 266                 .proc_handler   = &proc_dointvec
 267         },
 268         {
 269                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 270                 .procname       = "tcp_max_orphans",
 271                 .data           = &sysctl_tcp_max_orphans,
 272                 .maxlen         = sizeof(int),
 273                 .mode           = 0644,
 274                 .proc_handler   = &proc_dointvec
 275         },
 276         {
 277                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 278                 .procname       = "tcp_max_tw_buckets",
 279                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 280                 .maxlen         = sizeof(int),
 281                 .mode           = 0644,
 282                 .proc_handler   = &proc_dointvec
 283         },
 284         {
 285                 .ctl_name       = NET_IPV4_DYNADDR,
 286                 .procname       = "ip_dynaddr",
 287                 .data           = &sysctl_ip_dynaddr,
 288                 .maxlen         = sizeof(int),
 289                 .mode           = 0644,
 290                 .proc_handler   = &proc_dointvec
 291         },
 292         {
 293                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 294                 .procname       = "tcp_keepalive_time",
 295                 .data           = &sysctl_tcp_keepalive_time,
 296                 .maxlen         = sizeof(int),
 297                 .mode           = 0644,
 298                 .proc_handler   = &proc_dointvec_jiffies,
 299                 .strategy       = &sysctl_jiffies
 300         },
 301         {
 302                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 303                 .procname       = "tcp_keepalive_probes",
 304                 .data           = &sysctl_tcp_keepalive_probes,
 305                 .maxlen         = sizeof(int),
 306                 .mode           = 0644,
 307                 .proc_handler   = &proc_dointvec
 308         },
 309         {
 310                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 311                 .procname       = "tcp_keepalive_intvl",
 312                 .data           = &sysctl_tcp_keepalive_intvl,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = &proc_dointvec_jiffies,
 316                 .strategy       = &sysctl_jiffies
 317         },
 318         {
 319                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 320                 .procname       = "tcp_retries1",
 321                 .data           = &sysctl_tcp_retries1,
 322                 .maxlen         = sizeof(int),
 323                 .mode           = 0644,
 324                 .proc_handler   = &proc_dointvec_minmax,
 325                 .strategy       = &sysctl_intvec,
 326                 .extra2         = &tcp_retr1_max
 327         },
 328         {
 329                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 330                 .procname       = "tcp_retries2",
 331                 .data           = &sysctl_tcp_retries2,
 332                 .maxlen         = sizeof(int),
 333                 .mode           = 0644,
 334                 .proc_handler   = &proc_dointvec
 335         },
 336         {
 337                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 338                 .procname       = "tcp_fin_timeout",
 339                 .data           = &sysctl_tcp_fin_timeout,
 340                 .maxlen         = sizeof(int),
 341                 .mode           = 0644,
 342                 .proc_handler   = &proc_dointvec_jiffies,
 343                 .strategy       = &sysctl_jiffies
 344         },
 345 #ifdef CONFIG_SYN_COOKIES
 346         {
 347                 .ctl_name       = NET_TCP_SYNCOOKIES,
 348                 .procname       = "tcp_syncookies",
 349                 .data           = &sysctl_tcp_syncookies,
 350                 .maxlen         = sizeof(int),
 351                 .mode           = 0644,
 352                 .proc_handler   = &proc_dointvec
 353         },
 354 #endif
 355         {
 356                 .ctl_name       = NET_TCP_TW_RECYCLE,
 357                 .procname       = "tcp_tw_recycle",
 358                 .data           = &tcp_death_row.sysctl_tw_recycle,
 359                 .maxlen         = sizeof(int),
 360                 .mode           = 0644,
 361                 .proc_handler   = &proc_dointvec
 362         },
 363         {
 364                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 365                 .procname       = "tcp_abort_on_overflow",
 366                 .data           = &sysctl_tcp_abort_on_overflow,
 367                 .maxlen         = sizeof(int),
 368                 .mode           = 0644,
 369                 .proc_handler   = &proc_dointvec
 370         },
 371         {
 372                 .ctl_name       = NET_TCP_STDURG,
 373                 .procname       = "tcp_stdurg",
 374                 .data           = &sysctl_tcp_stdurg,
 375                 .maxlen         = sizeof(int),
 376                 .mode           = 0644,
 377                 .proc_handler   = &proc_dointvec
 378         },
 379         {
 380                 .ctl_name       = NET_TCP_RFC1337,
 381                 .procname       = "tcp_rfc1337",
 382                 .data           = &sysctl_tcp_rfc1337,
 383                 .maxlen         = sizeof(int),
 384                 .mode           = 0644,
 385                 .proc_handler   = &proc_dointvec
 386         },
 387         {
 388                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 389                 .procname       = "tcp_max_syn_backlog",
 390                 .data           = &sysctl_max_syn_backlog,
 391                 .maxlen         = sizeof(int),
 392                 .mode           = 0644,
 393                 .proc_handler   = &proc_dointvec
 394         },
 395         {
 396                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 397                 .procname       = "ip_local_port_range",
 398                 .data           = &sysctl_local_port_range,
 399                 .maxlen         = sizeof(sysctl_local_port_range),
 400                 .mode           = 0644,
 401                 .proc_handler   = &ipv4_local_port_range,
 402                 .strategy       = &ipv4_sysctl_local_port_range,
 403         },
 404 #ifdef CONFIG_IP_MULTICAST
 405         {
 406                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 407                 .procname       = "igmp_max_memberships",
 408                 .data           = &sysctl_igmp_max_memberships,
 409                 .maxlen         = sizeof(int),
 410                 .mode           = 0644,
 411                 .proc_handler   = &proc_dointvec
 412         },
 413
 414 #endif
 415         {
 416                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 417                 .procname       = "igmp_max_msf",
 418                 .data           = &sysctl_igmp_max_msf,
 419                 .maxlen         = sizeof(int),
 420                 .mode           = 0644,
 421                 .proc_handler   = &proc_dointvec
 422         },
 423         {
 424                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 425                 .procname       = "inet_peer_threshold",
 426                 .data           = &inet_peer_threshold,
 427                 .maxlen         = sizeof(int),
 428                 .mode           = 0644,
 429                 .proc_handler   = &proc_dointvec
 430         },
 431         {
 432                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 433                 .procname       = "inet_peer_minttl",
 434                 .data           = &inet_peer_minttl,
 435                 .maxlen         = sizeof(int),
 436                 .mode           = 0644,
 437                 .proc_handler   = &proc_dointvec_jiffies,
 438                 .strategy       = &sysctl_jiffies
 439         },
 440         {
 441                 .ctl_name       = NET_IPV4_INET_PEER_MAXTTL,
 442                 .procname       = "inet_peer_maxttl",
 443                 .data           = &inet_peer_maxttl,
 444                 .maxlen         = sizeof(int),
 445                 .mode           = 0644,
 446                 .proc_handler   = &proc_dointvec_jiffies,
 447                 .strategy       = &sysctl_jiffies
 448         },
 449         {
 450                 .ctl_name       = NET_IPV4_INET_PEER_GC_MINTIME,
 451                 .procname       = "inet_peer_gc_mintime",
 452                 .data           = &inet_peer_gc_mintime,
 453                 .maxlen         = sizeof(int),
 454                 .mode           = 0644,
 455                 .proc_handler   = &proc_dointvec_jiffies,
 456                 .strategy       = &sysctl_jiffies
 457         },
 458         {
 459                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 460                 .procname       = "inet_peer_gc_maxtime",
 461                 .data           = &inet_peer_gc_maxtime,
 462                 .maxlen         = sizeof(int),
 463                 .mode           = 0644,
 464                 .proc_handler   = &proc_dointvec_jiffies,
 465                 .strategy       = &sysctl_jiffies
 466         },
 467         {
 468                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 469                 .procname       = "tcp_orphan_retries",
 470                 .data           = &sysctl_tcp_orphan_retries,
 471                 .maxlen         = sizeof(int),
 472                 .mode           = 0644,
 473                 .proc_handler   = &proc_dointvec
 474         },
 475         {
 476                 .ctl_name       = NET_TCP_FACK,
 477                 .procname       = "tcp_fack",
 478                 .data           = &sysctl_tcp_fack,
 479                 .maxlen         = sizeof(int),
 480                 .mode           = 0644,
 481                 .proc_handler   = &proc_dointvec
 482         },
 483         {
 484                 .ctl_name       = NET_TCP_REORDERING,
 485                 .procname       = "tcp_reordering",
 486                 .data           = &sysctl_tcp_reordering,
 487                 .maxlen         = sizeof(int),
 488                 .mode           = 0644,
 489                 .proc_handler   = &proc_dointvec
 490         },
 491         {
 492                 .ctl_name       = NET_TCP_ECN,
 493                 .procname       = "tcp_ecn",
 494                 .data           = &sysctl_tcp_ecn,
 495                 .maxlen         = sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = &proc_dointvec
 498         },
 499         {
 500                 .ctl_name       = NET_TCP_DSACK,
 501                 .procname       = "tcp_dsack",
 502                 .data           = &sysctl_tcp_dsack,
 503                 .maxlen         = sizeof(int),
 504                 .mode           = 0644,
 505                 .proc_handler   = &proc_dointvec
 506         },
 507         {
 508                 .ctl_name       = NET_TCP_MEM,
 509                 .procname       = "tcp_mem",
 510                 .data           = &sysctl_tcp_mem,
 511                 .maxlen         = sizeof(sysctl_tcp_mem),
 512                 .mode           = 0644,
 513                 .proc_handler   = &proc_dointvec
 514         },
 515         {
 516                 .ctl_name       = NET_TCP_WMEM,
 517                 .procname       = "tcp_wmem",
 518                 .data           = &sysctl_tcp_wmem,
 519                 .maxlen         = sizeof(sysctl_tcp_wmem),
 520                 .mode           = 0644,
 521                 .proc_handler   = &proc_dointvec
 522         },
 523         {
 524                 .ctl_name       = NET_TCP_RMEM,
 525                 .procname       = "tcp_rmem",
 526                 .data           = &sysctl_tcp_rmem,
 527                 .maxlen         = sizeof(sysctl_tcp_rmem),
 528                 .mode           = 0644,
 529                 .proc_handler   = &proc_dointvec
 530         },
 531         {
 532                 .ctl_name       = NET_TCP_APP_WIN,
 533                 .procname       = "tcp_app_win",
 534                 .data           = &sysctl_tcp_app_win,
 535                 .maxlen         = sizeof(int),
 536                 .mode           = 0644,
 537                 .proc_handler   = &proc_dointvec
 538         },
 539         {
 540                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 541                 .procname       = "tcp_adv_win_scale",
 542                 .data           = &sysctl_tcp_adv_win_scale,
 543                 .maxlen         = sizeof(int),
 544                 .mode           = 0644,
 545                 .proc_handler   = &proc_dointvec
 546         },
 547         {
 548                 .ctl_name       = NET_TCP_TW_REUSE,
 549                 .procname       = "tcp_tw_reuse",
 550                 .data           = &sysctl_tcp_tw_reuse,
 551                 .maxlen         = sizeof(int),
 552                 .mode           = 0644,
 553                 .proc_handler   = &proc_dointvec
 554         },
 555         {
 556                 .ctl_name       = NET_TCP_FRTO,
 557                 .procname       = "tcp_frto",
 558                 .data           = &sysctl_tcp_frto,
 559                 .maxlen         = sizeof(int),
 560                 .mode           = 0644,
 561                 .proc_handler   = &proc_dointvec
 562         },
 563         {
 564                 .ctl_name       = NET_TCP_FRTO_RESPONSE,
 565                 .procname       = "tcp_frto_response",
 566                 .data           = &sysctl_tcp_frto_response,
 567                 .maxlen         = sizeof(int),
 568                 .mode           = 0644,
 569                 .proc_handler   = &proc_dointvec
 570         },
 571         {
 572                 .ctl_name       = NET_TCP_LOW_LATENCY,
 573                 .procname       = "tcp_low_latency",
 574                 .data           = &sysctl_tcp_low_latency,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = &proc_dointvec
 578         },
 579         {
 580                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 581                 .procname       = "tcp_no_metrics_save",
 582                 .data           = &sysctl_tcp_nometrics_save,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = &proc_dointvec,
 586         },
 587         {
 588                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 589                 .procname       = "tcp_moderate_rcvbuf",
 590                 .data           = &sysctl_tcp_moderate_rcvbuf,
 591                 .maxlen         = sizeof(int),
 592                 .mode           = 0644,
 593                 .proc_handler   = &proc_dointvec,
 594         },
 595         {
 596                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 597                 .procname       = "tcp_tso_win_divisor",
 598                 .data           = &sysctl_tcp_tso_win_divisor,
 599                 .maxlen         = sizeof(int),
 600                 .mode           = 0644,
 601                 .proc_handler   = &proc_dointvec,
 602         },
 603         {
 604                 .ctl_name       = NET_TCP_CONG_CONTROL,
 605                 .procname       = "tcp_congestion_control",
 606                 .mode           = 0644,
 607                 .maxlen         = TCP_CA_NAME_MAX,
 608                 .proc_handler   = &proc_tcp_congestion_control,
 609                 .strategy       = &sysctl_tcp_congestion_control,
 610         },
 611         {
 612                 .ctl_name       = NET_TCP_ABC,
 613                 .procname       = "tcp_abc",
 614                 .data           = &sysctl_tcp_abc,
 615                 .maxlen         = sizeof(int),
 616                 .mode           = 0644,
 617                 .proc_handler   = &proc_dointvec,
 618         },
 619         {
 620                 .ctl_name       = NET_TCP_MTU_PROBING,
 621                 .procname       = "tcp_mtu_probing",
 622                 .data           = &sysctl_tcp_mtu_probing,
 623                 .maxlen         = sizeof(int),
 624                 .mode           = 0644,
 625                 .proc_handler   = &proc_dointvec,
 626         },
 627         {
 628                 .ctl_name       = NET_TCP_BASE_MSS,
 629                 .procname       = "tcp_base_mss",
 630                 .data           = &sysctl_tcp_base_mss,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = &proc_dointvec,
 634         },
 635         {
 636                 .ctl_name       = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
 637                 .procname       = "tcp_workaround_signed_windows",
 638                 .data           = &sysctl_tcp_workaround_signed_windows,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 .proc_handler   = &proc_dointvec
 642         },
 643 #ifdef CONFIG_NET_DMA
 644         {
 645                 .ctl_name       = NET_TCP_DMA_COPYBREAK,
 646                 .procname       = "tcp_dma_copybreak",
 647                 .data           = &sysctl_tcp_dma_copybreak,
 648                 .maxlen         = sizeof(int),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec
 651         },
 652 #endif
 653         {
 654                 .ctl_name       = NET_TCP_SLOW_START_AFTER_IDLE,
 655                 .procname       = "tcp_slow_start_after_idle",
 656                 .data           = &sysctl_tcp_slow_start_after_idle,
 657                 .maxlen         = sizeof(int),
 658                 .mode           = 0644,
 659                 .proc_handler   = &proc_dointvec
 660         },
 661 #ifdef CONFIG_NETLABEL
 662         {
 663                 .ctl_name       = NET_CIPSOV4_CACHE_ENABLE,
 664                 .procname       = "cipso_cache_enable",
 665                 .data           = &cipso_v4_cache_enabled,
 666                 .maxlen         = sizeof(int),
 667                 .mode           = 0644,
 668                 .proc_handler   = &proc_dointvec,
 669         },
 670         {
 671                 .ctl_name       = NET_CIPSOV4_CACHE_BUCKET_SIZE,
 672                 .procname       = "cipso_cache_bucket_size",
 673                 .data           = &cipso_v4_cache_bucketsize,
 674                 .maxlen         = sizeof(int),
 675                 .mode           = 0644,
 676                 .proc_handler   = &proc_dointvec,
 677         },
 678         {
 679                 .ctl_name       = NET_CIPSOV4_RBM_OPTFMT,
 680                 .procname       = "cipso_rbm_optfmt",
 681                 .data           = &cipso_v4_rbm_optfmt,
 682                 .maxlen         = sizeof(int),
 683                 .mode           = 0644,
 684                 .proc_handler   = &proc_dointvec,
 685         },
 686         {
 687                 .ctl_name       = NET_CIPSOV4_RBM_STRICTVALID,
 688                 .procname       = "cipso_rbm_strictvalid",
 689                 .data           = &cipso_v4_rbm_strictvalid,
 690                 .maxlen         = sizeof(int),
 691                 .mode           = 0644,
 692                 .proc_handler   = &proc_dointvec,
 693         },
 694 #endif /* CONFIG_NETLABEL */
 695         {
 696                 .procname       = "tcp_available_congestion_control",
 697                 .maxlen         = TCP_CA_BUF_MAX,
 698                 .mode           = 0444,
 699                 .proc_handler   = &proc_tcp_available_congestion_control,
 700         },
 701         {
 702                 .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
 703                 .procname       = "tcp_allowed_congestion_control",
 704                 .maxlen         = TCP_CA_BUF_MAX,
 705                 .mode           = 0644,
 706                 .proc_handler   = &proc_allowed_congestion_control,
 707                 .strategy       = &strategy_allowed_congestion_control,
 708         },
 709         {
 710                 .ctl_name       = NET_TCP_MAX_SSTHRESH,
 711                 .procname       = "tcp_max_ssthresh",
 712                 .data           = &sysctl_tcp_max_ssthresh,
 713                 .maxlen         = sizeof(int),
 714                 .mode           = 0644,
 715                 .proc_handler   = &proc_dointvec,
 716         },
 717         {
 718                 .ctl_name       = CTL_UNNUMBERED,
 719                 .procname       = "udp_mem",
 720                 .data           = &sysctl_udp_mem,
 721                 .maxlen         = sizeof(sysctl_udp_mem),
 722                 .mode           = 0644,
 723                 .proc_handler   = &proc_dointvec_minmax,
 724                 .strategy       = &sysctl_intvec,
 725                 .extra1         = &zero
 726         },
 727         {
 728                 .ctl_name       = CTL_UNNUMBERED,
 729                 .procname       = "udp_rmem_min",
 730                 .data           = &sysctl_udp_rmem_min,
 731                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 732                 .mode           = 0644,
 733                 .proc_handler   = &proc_dointvec_minmax,
 734                 .strategy       = &sysctl_intvec,
 735                 .extra1         = &zero
 736         },
 737         {
 738                 .ctl_name       = CTL_UNNUMBERED,
 739                 .procname       = "udp_wmem_min",
 740                 .data           = &sysctl_udp_wmem_min,
 741                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 742                 .mode           = 0644,
 743                 .proc_handler   = &proc_dointvec_minmax,
 744                 .strategy       = &sysctl_intvec,
 745                 .extra1         = &zero
 746         },
 747         { .ctl_name = 0 }
 748 };
 749
 750 static struct ctl_table ipv4_net_table[] = {
 751         {
 752                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 753                 .procname       = "icmp_echo_ignore_all",
 754                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 755                 .maxlen         = sizeof(int),
 756                 .mode           = 0644,
 757                 .proc_handler   = &proc_dointvec
 758         },
 759         {
 760                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 761                 .procname       = "icmp_echo_ignore_broadcasts",
 762                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 763                 .maxlen         = sizeof(int),
 764                 .mode           = 0644,
 765                 .proc_handler   = &proc_dointvec
 766         },
 767         {
 768                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 769                 .procname       = "icmp_ignore_bogus_error_responses",
 770                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 771                 .maxlen         = sizeof(int),
 772                 .mode           = 0644,
 773                 .proc_handler   = &proc_dointvec
 774         },
 775         {
 776                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 777                 .procname       = "icmp_errors_use_inbound_ifaddr",
 778                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 779                 .maxlen         = sizeof(int),
 780                 .mode           = 0644,
 781                 .proc_handler   = &proc_dointvec
 782         },
 783         {
 784                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 785                 .procname       = "icmp_ratelimit",
 786                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 787                 .maxlen         = sizeof(int),
 788                 .mode           = 0644,
 789                 .proc_handler   = &proc_dointvec_ms_jiffies,
 790                 .strategy       = &sysctl_ms_jiffies
 791         },
 792         {
 793                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 794                 .procname       = "icmp_ratemask",
 795                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = &proc_dointvec
 799         },
 800         { }
 801 };
 802
 803 struct ctl_path net_ipv4_ctl_path[] = {
 804         { .procname = "net", .ctl_name = CTL_NET, },
 805         { .procname = "ipv4", .ctl_name = NET_IPV4, },
 806         { },
 807 };
 808 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
 809
 810 static __net_init int ipv4_sysctl_init_net(struct net *net)
 811 {
 812         struct ctl_table *table;
 813
 814         table = ipv4_net_table;
 815         if (net != &init_net) {
 816                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
 817                 if (table == NULL)
 818                         goto err_alloc;
 819
 820                 table[0].data =
 821                         &net->ipv4.sysctl_icmp_echo_ignore_all;
 822                 table[1].data =
 823                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
 824                 table[2].data =
 825                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
 826                 table[3].data =
 827                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
 828                 table[4].data =
 829                         &net->ipv4.sysctl_icmp_ratelimit;
 830                 table[5].data =
 831                         &net->ipv4.sysctl_icmp_ratemask;
 832         }
 833
 834         net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
 835                         net_ipv4_ctl_path, table);
 836         if (net->ipv4.ipv4_hdr == NULL)
 837                 goto err_reg;
 838
 839         return 0;
 840
 841 err_reg:
 842         if (net != &init_net)
 843                 kfree(table);
 844 err_alloc:
 845         return -ENOMEM;
 846 }
 847
 848 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 849 {
 850         struct ctl_table *table;
 851
 852         table = net->ipv4.ipv4_hdr->ctl_table_arg;
 853         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
 854         kfree(table);
 855 }
 856
 857 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 858         .init = ipv4_sysctl_init_net,
 859         .exit = ipv4_sysctl_exit_net,
 860 };
 861
 862 static __init int sysctl_ipv4_init(void)
 863 {
 864         struct ctl_table_header *hdr;
 865
 866         hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
 867         if (hdr == NULL)
 868                 return -ENOMEM;
 869
 870         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
 871                 unregister_sysctl_table(hdr);
 872                 return -ENOMEM;
 873         }
 874
 875         return 0;
 876 }
 877
 878 __initcall(sysctl_ipv4_init);