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   1 /*
   2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   3  *
   4  * $Id: sysctl_net_ipv4.c,v 1.50 2001/10/20 00:00:11 davem Exp $
   5  *
   6  * Begun April 1, 1996, Mike Shaver.
   7  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   8  */
   9
  10 #include <linux/mm.h>
  11 #include <linux/module.h>
  12 #include <linux/sysctl.h>
  13 #include <linux/igmp.h>
  14 #include <linux/inetdevice.h>
  15 #include <linux/seqlock.h>
  16 #include <linux/init.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
  26 static int zero;
  27 static int tcp_retr1_max = 255;
  28 static int ip_local_port_range_min[] = { 1, 1 };
  29 static int ip_local_port_range_max[] = { 65535, 65535 };
  30
  31 extern seqlock_t sysctl_port_range_lock;
  32 extern int sysctl_local_port_range[2];
  33
  34 /* Update system visible IP port range */
  35 static void set_local_port_range(int range[2])
  36 {
  37         write_seqlock(&sysctl_port_range_lock);
  38         sysctl_local_port_range[0] = range[0];
  39         sysctl_local_port_range[1] = range[1];
  40         write_sequnlock(&sysctl_port_range_lock);
  41 }
  42
  43 /* Validate changes from /proc interface. */
  44 static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
  45                                  void __user *buffer,
  46                                  size_t *lenp, loff_t *ppos)
  47 {
  48         int ret;
  49         int range[2] = { sysctl_local_port_range[0],
  50                          sysctl_local_port_range[1] };
  51         ctl_table tmp = {
  52                 .data = &range,
  53                 .maxlen = sizeof(range),
  54                 .mode = table->mode,
  55                 .extra1 = &ip_local_port_range_min,
  56                 .extra2 = &ip_local_port_range_max,
  57         };
  58
  59         ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
  60
  61         if (write && ret == 0) {
  62                 if (range[1] < range[0])
  63                         ret = -EINVAL;
  64                 else
  65                         set_local_port_range(range);
  66         }
  67
  68         return ret;
  69 }
  70
  71 /* Validate changes from sysctl interface. */
  72 static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
  73                                          int nlen, void __user *oldval,
  74                                          size_t __user *oldlenp,
  75                                         void __user *newval, size_t newlen)
  76 {
  77         int ret;
  78         int range[2] = { sysctl_local_port_range[0],
  79                          sysctl_local_port_range[1] };
  80         ctl_table tmp = {
  81                 .data = &range,
  82                 .maxlen = sizeof(range),
  83                 .mode = table->mode,
  84                 .extra1 = &ip_local_port_range_min,
  85                 .extra2 = &ip_local_port_range_max,
  86         };
  87
  88         ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
  89         if (ret == 0 && newval && newlen) {
  90                 if (range[1] < range[0])
  91                         ret = -EINVAL;
  92                 else
  93                         set_local_port_range(range);
  94         }
  95         return ret;
  96 }
  97
  98
  99 static int proc_tcp_congestion_control(ctl_table *ctl, int write, struct file * filp,
 100                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 101 {
 102         char val[TCP_CA_NAME_MAX];
 103         ctl_table tbl = {
 104                 .data = val,
 105                 .maxlen = TCP_CA_NAME_MAX,
 106         };
 107         int ret;
 108
 109         tcp_get_default_congestion_control(val);
 110
 111         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 112         if (write && ret == 0)
 113                 ret = tcp_set_default_congestion_control(val);
 114         return ret;
 115 }
 116
 117 static int sysctl_tcp_congestion_control(ctl_table *table, int __user *name,
 118                                          int nlen, void __user *oldval,
 119                                          size_t __user *oldlenp,
 120                                          void __user *newval, size_t newlen)
 121 {
 122         char val[TCP_CA_NAME_MAX];
 123         ctl_table tbl = {
 124                 .data = val,
 125                 .maxlen = TCP_CA_NAME_MAX,
 126         };
 127         int ret;
 128
 129         tcp_get_default_congestion_control(val);
 130         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 131         if (ret == 1 && newval && newlen)
 132                 ret = tcp_set_default_congestion_control(val);
 133         return ret;
 134 }
 135
 136 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 137                                                  int write, struct file * filp,
 138                                                  void __user *buffer, size_t *lenp,
 139                                                  loff_t *ppos)
 140 {
 141         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 142         int ret;
 143
 144         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 145         if (!tbl.data)
 146                 return -ENOMEM;
 147         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 148         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 149         kfree(tbl.data);
 150         return ret;
 151 }
 152
 153 static int proc_allowed_congestion_control(ctl_table *ctl,
 154                                            int write, struct file * filp,
 155                                            void __user *buffer, size_t *lenp,
 156                                            loff_t *ppos)
 157 {
 158         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 159         int ret;
 160
 161         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 162         if (!tbl.data)
 163                 return -ENOMEM;
 164
 165         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 166         ret = proc_dostring(&tbl, write, filp, buffer, lenp, ppos);
 167         if (write && ret == 0)
 168                 ret = tcp_set_allowed_congestion_control(tbl.data);
 169         kfree(tbl.data);
 170         return ret;
 171 }
 172
 173 static int strategy_allowed_congestion_control(ctl_table *table, int __user *name,
 174                                                int nlen, void __user *oldval,
 175                                                size_t __user *oldlenp,
 176                                                void __user *newval,
 177                                                size_t newlen)
 178 {
 179         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 180         int ret;
 181
 182         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 183         if (!tbl.data)
 184                 return -ENOMEM;
 185
 186         tcp_get_available_congestion_control(tbl.data, tbl.maxlen);
 187         ret = sysctl_string(&tbl, name, nlen, oldval, oldlenp, newval, newlen);
 188         if (ret == 1 && newval && newlen)
 189                 ret = tcp_set_allowed_congestion_control(tbl.data);
 190         kfree(tbl.data);
 191
 192         return ret;
 193
 194 }
 195
 196 static struct ctl_table ipv4_table[] = {
 197         {
 198                 .ctl_name       = NET_IPV4_TCP_TIMESTAMPS,
 199                 .procname       = "tcp_timestamps",
 200                 .data           = &sysctl_tcp_timestamps,
 201                 .maxlen         = sizeof(int),
 202                 .mode           = 0644,
 203                 .proc_handler   = &proc_dointvec
 204         },
 205         {
 206                 .ctl_name       = NET_IPV4_TCP_WINDOW_SCALING,
 207                 .procname       = "tcp_window_scaling",
 208                 .data           = &sysctl_tcp_window_scaling,
 209                 .maxlen         = sizeof(int),
 210                 .mode           = 0644,
 211                 .proc_handler   = &proc_dointvec
 212         },
 213         {
 214                 .ctl_name       = NET_IPV4_TCP_SACK,
 215                 .procname       = "tcp_sack",
 216                 .data           = &sysctl_tcp_sack,
 217                 .maxlen         = sizeof(int),
 218                 .mode           = 0644,
 219                 .proc_handler   = &proc_dointvec
 220         },
 221         {
 222                 .ctl_name       = NET_IPV4_TCP_RETRANS_COLLAPSE,
 223                 .procname       = "tcp_retrans_collapse",
 224                 .data           = &sysctl_tcp_retrans_collapse,
 225                 .maxlen         = sizeof(int),
 226                 .mode           = 0644,
 227                 .proc_handler   = &proc_dointvec
 228         },
 229         {
 230                 .ctl_name       = NET_IPV4_DEFAULT_TTL,
 231                 .procname       = "ip_default_ttl",
 232                 .data           = &sysctl_ip_default_ttl,
 233                 .maxlen         = sizeof(int),
 234                 .mode           = 0644,
 235                 .proc_handler   = &ipv4_doint_and_flush,
 236                 .strategy       = &ipv4_doint_and_flush_strategy,
 237         },
 238         {
 239                 .ctl_name       = NET_IPV4_NO_PMTU_DISC,
 240                 .procname       = "ip_no_pmtu_disc",
 241                 .data           = &ipv4_config.no_pmtu_disc,
 242                 .maxlen         = sizeof(int),
 243                 .mode           = 0644,
 244                 .proc_handler   = &proc_dointvec
 245         },
 246         {
 247                 .ctl_name       = NET_IPV4_NONLOCAL_BIND,
 248                 .procname       = "ip_nonlocal_bind",
 249                 .data           = &sysctl_ip_nonlocal_bind,
 250                 .maxlen         = sizeof(int),
 251                 .mode           = 0644,
 252                 .proc_handler   = &proc_dointvec
 253         },
 254         {
 255                 .ctl_name       = NET_IPV4_TCP_SYN_RETRIES,
 256                 .procname       = "tcp_syn_retries",
 257                 .data           = &sysctl_tcp_syn_retries,
 258                 .maxlen         = sizeof(int),
 259                 .mode           = 0644,
 260                 .proc_handler   = &proc_dointvec
 261         },
 262         {
 263                 .ctl_name       = NET_TCP_SYNACK_RETRIES,
 264                 .procname       = "tcp_synack_retries",
 265                 .data           = &sysctl_tcp_synack_retries,
 266                 .maxlen         = sizeof(int),
 267                 .mode           = 0644,
 268                 .proc_handler   = &proc_dointvec
 269         },
 270         {
 271                 .ctl_name       = NET_TCP_MAX_ORPHANS,
 272                 .procname       = "tcp_max_orphans",
 273                 .data           = &sysctl_tcp_max_orphans,
 274                 .maxlen         = sizeof(int),
 275                 .mode           = 0644,
 276                 .proc_handler   = &proc_dointvec
 277         },
 278         {
 279                 .ctl_name       = NET_TCP_MAX_TW_BUCKETS,
 280                 .procname       = "tcp_max_tw_buckets",
 281                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 282                 .maxlen         = sizeof(int),
 283                 .mode           = 0644,
 284                 .proc_handler   = &proc_dointvec
 285         },
 286         {
 287                 .ctl_name       = NET_IPV4_DYNADDR,
 288                 .procname       = "ip_dynaddr",
 289                 .data           = &sysctl_ip_dynaddr,
 290                 .maxlen         = sizeof(int),
 291                 .mode           = 0644,
 292                 .proc_handler   = &proc_dointvec
 293         },
 294         {
 295                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_TIME,
 296                 .procname       = "tcp_keepalive_time",
 297                 .data           = &sysctl_tcp_keepalive_time,
 298                 .maxlen         = sizeof(int),
 299                 .mode           = 0644,
 300                 .proc_handler   = &proc_dointvec_jiffies,
 301                 .strategy       = &sysctl_jiffies
 302         },
 303         {
 304                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_PROBES,
 305                 .procname       = "tcp_keepalive_probes",
 306                 .data           = &sysctl_tcp_keepalive_probes,
 307                 .maxlen         = sizeof(int),
 308                 .mode           = 0644,
 309                 .proc_handler   = &proc_dointvec
 310         },
 311         {
 312                 .ctl_name       = NET_IPV4_TCP_KEEPALIVE_INTVL,
 313                 .procname       = "tcp_keepalive_intvl",
 314                 .data           = &sysctl_tcp_keepalive_intvl,
 315                 .maxlen         = sizeof(int),
 316                 .mode           = 0644,
 317                 .proc_handler   = &proc_dointvec_jiffies,
 318                 .strategy       = &sysctl_jiffies
 319         },
 320         {
 321                 .ctl_name       = NET_IPV4_TCP_RETRIES1,
 322                 .procname       = "tcp_retries1",
 323                 .data           = &sysctl_tcp_retries1,
 324                 .maxlen         = sizeof(int),
 325                 .mode           = 0644,
 326                 .proc_handler   = &proc_dointvec_minmax,
 327                 .strategy       = &sysctl_intvec,
 328                 .extra2         = &tcp_retr1_max
 329         },
 330         {
 331                 .ctl_name       = NET_IPV4_TCP_RETRIES2,
 332                 .procname       = "tcp_retries2",
 333                 .data           = &sysctl_tcp_retries2,
 334                 .maxlen         = sizeof(int),
 335                 .mode           = 0644,
 336                 .proc_handler   = &proc_dointvec
 337         },
 338         {
 339                 .ctl_name       = NET_IPV4_TCP_FIN_TIMEOUT,
 340                 .procname       = "tcp_fin_timeout",
 341                 .data           = &sysctl_tcp_fin_timeout,
 342                 .maxlen         = sizeof(int),
 343                 .mode           = 0644,
 344                 .proc_handler   = &proc_dointvec_jiffies,
 345                 .strategy       = &sysctl_jiffies
 346         },
 347 #ifdef CONFIG_SYN_COOKIES
 348         {
 349                 .ctl_name       = NET_TCP_SYNCOOKIES,
 350                 .procname       = "tcp_syncookies",
 351                 .data           = &sysctl_tcp_syncookies,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = &proc_dointvec
 355         },
 356 #endif
 357         {
 358                 .ctl_name       = NET_TCP_TW_RECYCLE,
 359                 .procname       = "tcp_tw_recycle",
 360                 .data           = &tcp_death_row.sysctl_tw_recycle,
 361                 .maxlen         = sizeof(int),
 362                 .mode           = 0644,
 363                 .proc_handler   = &proc_dointvec
 364         },
 365         {
 366                 .ctl_name       = NET_TCP_ABORT_ON_OVERFLOW,
 367                 .procname       = "tcp_abort_on_overflow",
 368                 .data           = &sysctl_tcp_abort_on_overflow,
 369                 .maxlen         = sizeof(int),
 370                 .mode           = 0644,
 371                 .proc_handler   = &proc_dointvec
 372         },
 373         {
 374                 .ctl_name       = NET_TCP_STDURG,
 375                 .procname       = "tcp_stdurg",
 376                 .data           = &sysctl_tcp_stdurg,
 377                 .maxlen         = sizeof(int),
 378                 .mode           = 0644,
 379                 .proc_handler   = &proc_dointvec
 380         },
 381         {
 382                 .ctl_name       = NET_TCP_RFC1337,
 383                 .procname       = "tcp_rfc1337",
 384                 .data           = &sysctl_tcp_rfc1337,
 385                 .maxlen         = sizeof(int),
 386                 .mode           = 0644,
 387                 .proc_handler   = &proc_dointvec
 388         },
 389         {
 390                 .ctl_name       = NET_TCP_MAX_SYN_BACKLOG,
 391                 .procname       = "tcp_max_syn_backlog",
 392                 .data           = &sysctl_max_syn_backlog,
 393                 .maxlen         = sizeof(int),
 394                 .mode           = 0644,
 395                 .proc_handler   = &proc_dointvec
 396         },
 397         {
 398                 .ctl_name       = NET_IPV4_LOCAL_PORT_RANGE,
 399                 .procname       = "ip_local_port_range",
 400                 .data           = &sysctl_local_port_range,
 401                 .maxlen         = sizeof(sysctl_local_port_range),
 402                 .mode           = 0644,
 403                 .proc_handler   = &ipv4_local_port_range,
 404                 .strategy       = &ipv4_sysctl_local_port_range,
 405         },
 406         {
 407                 .ctl_name       = NET_IPV4_ROUTE,
 408                 .procname       = "route",
 409                 .maxlen         = 0,
 410                 .mode           = 0555,
 411                 .child          = ipv4_route_table
 412         },
 413 #ifdef CONFIG_IP_MULTICAST
 414         {
 415                 .ctl_name       = NET_IPV4_IGMP_MAX_MEMBERSHIPS,
 416                 .procname       = "igmp_max_memberships",
 417                 .data           = &sysctl_igmp_max_memberships,
 418                 .maxlen         = sizeof(int),
 419                 .mode           = 0644,
 420                 .proc_handler   = &proc_dointvec
 421         },
 422
 423 #endif
 424         {
 425                 .ctl_name       = NET_IPV4_IGMP_MAX_MSF,
 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                 .ctl_name       = NET_IPV4_INET_PEER_THRESHOLD,
 434                 .procname       = "inet_peer_threshold",
 435                 .data           = &inet_peer_threshold,
 436                 .maxlen         = sizeof(int),
 437                 .mode           = 0644,
 438                 .proc_handler   = &proc_dointvec
 439         },
 440         {
 441                 .ctl_name       = NET_IPV4_INET_PEER_MINTTL,
 442                 .procname       = "inet_peer_minttl",
 443                 .data           = &inet_peer_minttl,
 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_MAXTTL,
 451                 .procname       = "inet_peer_maxttl",
 452                 .data           = &inet_peer_maxttl,
 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_MINTIME,
 460                 .procname       = "inet_peer_gc_mintime",
 461                 .data           = &inet_peer_gc_mintime,
 462                 .maxlen         = sizeof(int),
 463                 .mode           = 0644,
 464                 .proc_handler   = &proc_dointvec_jiffies,
 465                 .strategy       = &sysctl_jiffies
 466         },
 467         {
 468                 .ctl_name       = NET_IPV4_INET_PEER_GC_MAXTIME,
 469                 .procname       = "inet_peer_gc_maxtime",
 470                 .data           = &inet_peer_gc_maxtime,
 471                 .maxlen         = sizeof(int),
 472                 .mode           = 0644,
 473                 .proc_handler   = &proc_dointvec_jiffies,
 474                 .strategy       = &sysctl_jiffies
 475         },
 476         {
 477                 .ctl_name       = NET_TCP_ORPHAN_RETRIES,
 478                 .procname       = "tcp_orphan_retries",
 479                 .data           = &sysctl_tcp_orphan_retries,
 480                 .maxlen         = sizeof(int),
 481                 .mode           = 0644,
 482                 .proc_handler   = &proc_dointvec
 483         },
 484         {
 485                 .ctl_name       = NET_TCP_FACK,
 486                 .procname       = "tcp_fack",
 487                 .data           = &sysctl_tcp_fack,
 488                 .maxlen         = sizeof(int),
 489                 .mode           = 0644,
 490                 .proc_handler   = &proc_dointvec
 491         },
 492         {
 493                 .ctl_name       = NET_TCP_REORDERING,
 494                 .procname       = "tcp_reordering",
 495                 .data           = &sysctl_tcp_reordering,
 496                 .maxlen         = sizeof(int),
 497                 .mode           = 0644,
 498                 .proc_handler   = &proc_dointvec
 499         },
 500         {
 501                 .ctl_name       = NET_TCP_ECN,
 502                 .procname       = "tcp_ecn",
 503                 .data           = &sysctl_tcp_ecn,
 504                 .maxlen         = sizeof(int),
 505                 .mode           = 0644,
 506                 .proc_handler   = &proc_dointvec
 507         },
 508         {
 509                 .ctl_name       = NET_TCP_DSACK,
 510                 .procname       = "tcp_dsack",
 511                 .data           = &sysctl_tcp_dsack,
 512                 .maxlen         = sizeof(int),
 513                 .mode           = 0644,
 514                 .proc_handler   = &proc_dointvec
 515         },
 516         {
 517                 .ctl_name       = NET_TCP_MEM,
 518                 .procname       = "tcp_mem",
 519                 .data           = &sysctl_tcp_mem,
 520                 .maxlen         = sizeof(sysctl_tcp_mem),
 521                 .mode           = 0644,
 522                 .proc_handler   = &proc_dointvec
 523         },
 524         {
 525                 .ctl_name       = NET_TCP_WMEM,
 526                 .procname       = "tcp_wmem",
 527                 .data           = &sysctl_tcp_wmem,
 528                 .maxlen         = sizeof(sysctl_tcp_wmem),
 529                 .mode           = 0644,
 530                 .proc_handler   = &proc_dointvec
 531         },
 532         {
 533                 .ctl_name       = NET_TCP_RMEM,
 534                 .procname       = "tcp_rmem",
 535                 .data           = &sysctl_tcp_rmem,
 536                 .maxlen         = sizeof(sysctl_tcp_rmem),
 537                 .mode           = 0644,
 538                 .proc_handler   = &proc_dointvec
 539         },
 540         {
 541                 .ctl_name       = NET_TCP_APP_WIN,
 542                 .procname       = "tcp_app_win",
 543                 .data           = &sysctl_tcp_app_win,
 544                 .maxlen         = sizeof(int),
 545                 .mode           = 0644,
 546                 .proc_handler   = &proc_dointvec
 547         },
 548         {
 549                 .ctl_name       = NET_TCP_ADV_WIN_SCALE,
 550                 .procname       = "tcp_adv_win_scale",
 551                 .data           = &sysctl_tcp_adv_win_scale,
 552                 .maxlen         = sizeof(int),
 553                 .mode           = 0644,
 554                 .proc_handler   = &proc_dointvec
 555         },
 556         {
 557                 .ctl_name       = NET_TCP_TW_REUSE,
 558                 .procname       = "tcp_tw_reuse",
 559                 .data           = &sysctl_tcp_tw_reuse,
 560                 .maxlen         = sizeof(int),
 561                 .mode           = 0644,
 562                 .proc_handler   = &proc_dointvec
 563         },
 564         {
 565                 .ctl_name       = NET_TCP_FRTO,
 566                 .procname       = "tcp_frto",
 567                 .data           = &sysctl_tcp_frto,
 568                 .maxlen         = sizeof(int),
 569                 .mode           = 0644,
 570                 .proc_handler   = &proc_dointvec
 571         },
 572         {
 573                 .ctl_name       = NET_TCP_FRTO_RESPONSE,
 574                 .procname       = "tcp_frto_response",
 575                 .data           = &sysctl_tcp_frto_response,
 576                 .maxlen         = sizeof(int),
 577                 .mode           = 0644,
 578                 .proc_handler   = &proc_dointvec
 579         },
 580         {
 581                 .ctl_name       = NET_TCP_LOW_LATENCY,
 582                 .procname       = "tcp_low_latency",
 583                 .data           = &sysctl_tcp_low_latency,
 584                 .maxlen         = sizeof(int),
 585                 .mode           = 0644,
 586                 .proc_handler   = &proc_dointvec
 587         },
 588         {
 589                 .ctl_name       = NET_TCP_NO_METRICS_SAVE,
 590                 .procname       = "tcp_no_metrics_save",
 591                 .data           = &sysctl_tcp_nometrics_save,
 592                 .maxlen         = sizeof(int),
 593                 .mode           = 0644,
 594                 .proc_handler   = &proc_dointvec,
 595         },
 596         {
 597                 .ctl_name       = NET_TCP_MODERATE_RCVBUF,
 598                 .procname       = "tcp_moderate_rcvbuf",
 599                 .data           = &sysctl_tcp_moderate_rcvbuf,
 600                 .maxlen         = sizeof(int),
 601                 .mode           = 0644,
 602                 .proc_handler   = &proc_dointvec,
 603         },
 604         {
 605                 .ctl_name       = NET_TCP_TSO_WIN_DIVISOR,
 606                 .procname       = "tcp_tso_win_divisor",
 607                 .data           = &sysctl_tcp_tso_win_divisor,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = &proc_dointvec,
 611         },
 612         {
 613                 .ctl_name       = NET_TCP_CONG_CONTROL,
 614                 .procname       = "tcp_congestion_control",
 615                 .mode           = 0644,
 616                 .maxlen         = TCP_CA_NAME_MAX,
 617                 .proc_handler   = &proc_tcp_congestion_control,
 618                 .strategy       = &sysctl_tcp_congestion_control,
 619         },
 620         {
 621                 .ctl_name       = NET_TCP_ABC,
 622                 .procname       = "tcp_abc",
 623                 .data           = &sysctl_tcp_abc,
 624                 .maxlen         = sizeof(int),
 625                 .mode           = 0644,
 626                 .proc_handler   = &proc_dointvec,
 627         },
 628         {
 629                 .ctl_name       = NET_TCP_MTU_PROBING,
 630                 .procname       = "tcp_mtu_probing",
 631                 .data           = &sysctl_tcp_mtu_probing,
 632                 .maxlen         = sizeof(int),
 633                 .mode           = 0644,
 634                 .proc_handler   = &proc_dointvec,
 635         },
 636         {
 637                 .ctl_name       = NET_TCP_BASE_MSS,
 638                 .procname       = "tcp_base_mss",
 639                 .data           = &sysctl_tcp_base_mss,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = &proc_dointvec,
 643         },
 644         {
 645                 .ctl_name       = NET_IPV4_TCP_WORKAROUND_SIGNED_WINDOWS,
 646                 .procname       = "tcp_workaround_signed_windows",
 647                 .data           = &sysctl_tcp_workaround_signed_windows,
 648                 .maxlen         = sizeof(int),
 649                 .mode           = 0644,
 650                 .proc_handler   = &proc_dointvec
 651         },
 652 #ifdef CONFIG_NET_DMA
 653         {
 654                 .ctl_name       = NET_TCP_DMA_COPYBREAK,
 655                 .procname       = "tcp_dma_copybreak",
 656                 .data           = &sysctl_tcp_dma_copybreak,
 657                 .maxlen         = sizeof(int),
 658                 .mode           = 0644,
 659                 .proc_handler   = &proc_dointvec
 660         },
 661 #endif
 662         {
 663                 .ctl_name       = NET_TCP_SLOW_START_AFTER_IDLE,
 664                 .procname       = "tcp_slow_start_after_idle",
 665                 .data           = &sysctl_tcp_slow_start_after_idle,
 666                 .maxlen         = sizeof(int),
 667                 .mode           = 0644,
 668                 .proc_handler   = &proc_dointvec
 669         },
 670 #ifdef CONFIG_NETLABEL
 671         {
 672                 .ctl_name       = NET_CIPSOV4_CACHE_ENABLE,
 673                 .procname       = "cipso_cache_enable",
 674                 .data           = &cipso_v4_cache_enabled,
 675                 .maxlen         = sizeof(int),
 676                 .mode           = 0644,
 677                 .proc_handler   = &proc_dointvec,
 678         },
 679         {
 680                 .ctl_name       = NET_CIPSOV4_CACHE_BUCKET_SIZE,
 681                 .procname       = "cipso_cache_bucket_size",
 682                 .data           = &cipso_v4_cache_bucketsize,
 683                 .maxlen         = sizeof(int),
 684                 .mode           = 0644,
 685                 .proc_handler   = &proc_dointvec,
 686         },
 687         {
 688                 .ctl_name       = NET_CIPSOV4_RBM_OPTFMT,
 689                 .procname       = "cipso_rbm_optfmt",
 690                 .data           = &cipso_v4_rbm_optfmt,
 691                 .maxlen         = sizeof(int),
 692                 .mode           = 0644,
 693                 .proc_handler   = &proc_dointvec,
 694         },
 695         {
 696                 .ctl_name       = NET_CIPSOV4_RBM_STRICTVALID,
 697                 .procname       = "cipso_rbm_strictvalid",
 698                 .data           = &cipso_v4_rbm_strictvalid,
 699                 .maxlen         = sizeof(int),
 700                 .mode           = 0644,
 701                 .proc_handler   = &proc_dointvec,
 702         },
 703 #endif /* CONFIG_NETLABEL */
 704         {
 705                 .procname       = "tcp_available_congestion_control",
 706                 .maxlen         = TCP_CA_BUF_MAX,
 707                 .mode           = 0444,
 708                 .proc_handler   = &proc_tcp_available_congestion_control,
 709         },
 710         {
 711                 .ctl_name       = NET_TCP_ALLOWED_CONG_CONTROL,
 712                 .procname       = "tcp_allowed_congestion_control",
 713                 .maxlen         = TCP_CA_BUF_MAX,
 714                 .mode           = 0644,
 715                 .proc_handler   = &proc_allowed_congestion_control,
 716                 .strategy       = &strategy_allowed_congestion_control,
 717         },
 718         {
 719                 .ctl_name       = NET_TCP_MAX_SSTHRESH,
 720                 .procname       = "tcp_max_ssthresh",
 721                 .data           = &sysctl_tcp_max_ssthresh,
 722                 .maxlen         = sizeof(int),
 723                 .mode           = 0644,
 724                 .proc_handler   = &proc_dointvec,
 725         },
 726         {
 727                 .ctl_name       = CTL_UNNUMBERED,
 728                 .procname       = "udp_mem",
 729                 .data           = &sysctl_udp_mem,
 730                 .maxlen         = sizeof(sysctl_udp_mem),
 731                 .mode           = 0644,
 732                 .proc_handler   = &proc_dointvec_minmax,
 733                 .strategy       = &sysctl_intvec,
 734                 .extra1         = &zero
 735         },
 736         {
 737                 .ctl_name       = CTL_UNNUMBERED,
 738                 .procname       = "udp_rmem_min",
 739                 .data           = &sysctl_udp_rmem_min,
 740                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 741                 .mode           = 0644,
 742                 .proc_handler   = &proc_dointvec_minmax,
 743                 .strategy       = &sysctl_intvec,
 744                 .extra1         = &zero
 745         },
 746         {
 747                 .ctl_name       = CTL_UNNUMBERED,
 748                 .procname       = "udp_wmem_min",
 749                 .data           = &sysctl_udp_wmem_min,
 750                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 751                 .mode           = 0644,
 752                 .proc_handler   = &proc_dointvec_minmax,
 753                 .strategy       = &sysctl_intvec,
 754                 .extra1         = &zero
 755         },
 756         { .ctl_name = 0 }
 757 };
 758
 759 static struct ctl_table ipv4_net_table[] = {
 760         {
 761                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_ALL,
 762                 .procname       = "icmp_echo_ignore_all",
 763                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 764                 .maxlen         = sizeof(int),
 765                 .mode           = 0644,
 766                 .proc_handler   = &proc_dointvec
 767         },
 768         {
 769                 .ctl_name       = NET_IPV4_ICMP_ECHO_IGNORE_BROADCASTS,
 770                 .procname       = "icmp_echo_ignore_broadcasts",
 771                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 772                 .maxlen         = sizeof(int),
 773                 .mode           = 0644,
 774                 .proc_handler   = &proc_dointvec
 775         },
 776         {
 777                 .ctl_name       = NET_IPV4_ICMP_IGNORE_BOGUS_ERROR_RESPONSES,
 778                 .procname       = "icmp_ignore_bogus_error_responses",
 779                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 780                 .maxlen         = sizeof(int),
 781                 .mode           = 0644,
 782                 .proc_handler   = &proc_dointvec
 783         },
 784         {
 785                 .ctl_name       = NET_IPV4_ICMP_ERRORS_USE_INBOUND_IFADDR,
 786                 .procname       = "icmp_errors_use_inbound_ifaddr",
 787                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 788                 .maxlen         = sizeof(int),
 789                 .mode           = 0644,
 790                 .proc_handler   = &proc_dointvec
 791         },
 792         {
 793                 .ctl_name       = NET_IPV4_ICMP_RATELIMIT,
 794                 .procname       = "icmp_ratelimit",
 795                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = &proc_dointvec
 799         },
 800         {
 801                 .ctl_name       = NET_IPV4_ICMP_RATEMASK,
 802                 .procname       = "icmp_ratemask",
 803                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 804                 .maxlen         = sizeof(int),
 805                 .mode           = 0644,
 806                 .proc_handler   = &proc_dointvec
 807         },
 808         { }
 809 };
 810
 811 struct ctl_path net_ipv4_ctl_path[] = {
 812         { .procname = "net", .ctl_name = CTL_NET, },
 813         { .procname = "ipv4", .ctl_name = NET_IPV4, },
 814         { },
 815 };
 816 EXPORT_SYMBOL_GPL(net_ipv4_ctl_path);
 817
 818 static __net_init int ipv4_sysctl_init_net(struct net *net)
 819 {
 820         struct ctl_table *table;
 821
 822         table = ipv4_net_table;
 823         if (net != &init_net) {
 824                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
 825                 if (table == NULL)
 826                         goto err_alloc;
 827
 828                 table[0].data =
 829                         &net->ipv4.sysctl_icmp_echo_ignore_all;
 830                 table[1].data =
 831                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
 832                 table[2].data =
 833                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
 834                 table[3].data =
 835                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
 836                 table[4].data =
 837                         &net->ipv4.sysctl_icmp_ratelimit;
 838                 table[5].data =
 839                         &net->ipv4.sysctl_icmp_ratemask;
 840         }
 841
 842         net->ipv4.ipv4_hdr = register_net_sysctl_table(net,
 843                         net_ipv4_ctl_path, table);
 844         if (net->ipv4.ipv4_hdr == NULL)
 845                 goto err_reg;
 846
 847         return 0;
 848
 849 err_reg:
 850         if (net != &init_net)
 851                 kfree(table);
 852 err_alloc:
 853         return -ENOMEM;
 854 }
 855
 856 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 857 {
 858         struct ctl_table *table;
 859
 860         table = net->ipv4.ipv4_hdr->ctl_table_arg;
 861         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
 862         kfree(table);
 863 }
 864
 865 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 866         .init = ipv4_sysctl_init_net,
 867         .exit = ipv4_sysctl_exit_net,
 868 };
 869
 870 static __init int sysctl_ipv4_init(void)
 871 {
 872         struct ctl_table_header *hdr;
 873
 874         hdr = register_sysctl_paths(net_ipv4_ctl_path, ipv4_table);
 875         if (hdr == NULL)
 876                 return -ENOMEM;
 877
 878         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
 879                 unregister_sysctl_table(hdr);
 880                 return -ENOMEM;
 881         }
 882
 883         return 0;
 884 }
 885
 886 __initcall(sysctl_ipv4_init);