net/ipv4/sysctl_net_ipv4.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   4  *
   5  * Begun April 1, 1996, Mike Shaver.
   6  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   7  */
   8
   9 #include <linux/mm.h>
  10 #include <linux/module.h>
  11 #include <linux/sysctl.h>
  12 #include <linux/igmp.h>
  13 #include <linux/inetdevice.h>
  14 #include <linux/seqlock.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/nsproxy.h>
  18 #include <linux/swap.h>
  19 #include <net/snmp.h>
  20 #include <net/icmp.h>
  21 #include <net/ip.h>
  22 #include <net/route.h>
  23 #include <net/tcp.h>
  24 #include <net/udp.h>
  25 #include <net/cipso_ipv4.h>
  26 #include <net/inet_frag.h>
  27 #include <net/ping.h>
  28 #include <net/protocol.h>
  29 #include <net/netevent.h>
  30
  31 static int zero;
  32 static int one = 1;
  33 static int two = 2;
  34 static int four = 4;
  35 static int thousand = 1000;
  36 static int gso_max_segs = GSO_MAX_SEGS;
  37 static int tcp_retr1_max = 255;
  38 static int ip_local_port_range_min[] = { 1, 1 };
  39 static int ip_local_port_range_max[] = { 65535, 65535 };
  40 static int tcp_adv_win_scale_min = -31;
  41 static int tcp_adv_win_scale_max = 31;
  42 static int ip_privileged_port_min;
  43 static int ip_privileged_port_max = 65535;
  44 static int ip_ttl_min = 1;
  45 static int ip_ttl_max = 255;
  46 static int tcp_syn_retries_min = 1;
  47 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  48 static int ip_ping_group_range_min[] = { 0, 0 };
  49 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  50 static int comp_sack_nr_max = 255;
  51
  52 /* obsolete */
  53 static int sysctl_tcp_low_latency __read_mostly;
  54
  55 /* Update system visible IP port range */
  56 static void set_local_port_range(struct net *net, int range[2])
  57 {
  58         bool same_parity = !((range[0] ^ range[1]) & 1);
  59
  60         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  61         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  62                 net->ipv4.ip_local_ports.warned = true;
  63                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  64         }
  65         net->ipv4.ip_local_ports.range[0] = range[0];
  66         net->ipv4.ip_local_ports.range[1] = range[1];
  67         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  68 }
  69
  70 /* Validate changes from /proc interface. */
  71 static int ipv4_local_port_range(struct ctl_table *table, int write,
  72                                  void __user *buffer,
  73                                  size_t *lenp, loff_t *ppos)
  74 {
  75         struct net *net =
  76                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  77         int ret;
  78         int range[2];
  79         struct ctl_table tmp = {
  80                 .data = &range,
  81                 .maxlen = sizeof(range),
  82                 .mode = table->mode,
  83                 .extra1 = &ip_local_port_range_min,
  84                 .extra2 = &ip_local_port_range_max,
  85         };
  86
  87         inet_get_local_port_range(net, &range[0], &range[1]);
  88
  89         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  90
  91         if (write && ret == 0) {
  92                 /* Ensure that the upper limit is not smaller than the lower,
  93                  * and that the lower does not encroach upon the privileged
  94                  * port limit.
  95                  */
  96                 if ((range[1] < range[0]) ||
  97                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
  98                         ret = -EINVAL;
  99                 else
 100                         set_local_port_range(net, range);
 101         }
 102
 103         return ret;
 104 }
 105
 106 /* Validate changes from /proc interface. */
 107 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 108                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 109 {
 110         struct net *net = container_of(table->data, struct net,
 111             ipv4.sysctl_ip_prot_sock);
 112         int ret;
 113         int pports;
 114         int range[2];
 115         struct ctl_table tmp = {
 116                 .data = &pports,
 117                 .maxlen = sizeof(pports),
 118                 .mode = table->mode,
 119                 .extra1 = &ip_privileged_port_min,
 120                 .extra2 = &ip_privileged_port_max,
 121         };
 122
 123         pports = net->ipv4.sysctl_ip_prot_sock;
 124
 125         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 126
 127         if (write && ret == 0) {
 128                 inet_get_local_port_range(net, &range[0], &range[1]);
 129                 /* Ensure that the local port range doesn't overlap with the
 130                  * privileged port range.
 131                  */
 132                 if (range[0] < pports)
 133                         ret = -EINVAL;
 134                 else
 135                         net->ipv4.sysctl_ip_prot_sock = pports;
 136         }
 137
 138         return ret;
 139 }
 140
 141 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 142 {
 143         kgid_t *data = table->data;
 144         struct net *net =
 145                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 146         unsigned int seq;
 147         do {
 148                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 149
 150                 *low = data[0];
 151                 *high = data[1];
 152         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 153 }
 154
 155 /* Update system visible IP port range */
 156 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 157 {
 158         kgid_t *data = table->data;
 159         struct net *net =
 160                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 161         write_seqlock(&net->ipv4.ping_group_range.lock);
 162         data[0] = low;
 163         data[1] = high;
 164         write_sequnlock(&net->ipv4.ping_group_range.lock);
 165 }
 166
 167 /* Validate changes from /proc interface. */
 168 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 169                                  void __user *buffer,
 170                                  size_t *lenp, loff_t *ppos)
 171 {
 172         struct user_namespace *user_ns = current_user_ns();
 173         int ret;
 174         gid_t urange[2];
 175         kgid_t low, high;
 176         struct ctl_table tmp = {
 177                 .data = &urange,
 178                 .maxlen = sizeof(urange),
 179                 .mode = table->mode,
 180                 .extra1 = &ip_ping_group_range_min,
 181                 .extra2 = &ip_ping_group_range_max,
 182         };
 183
 184         inet_get_ping_group_range_table(table, &low, &high);
 185         urange[0] = from_kgid_munged(user_ns, low);
 186         urange[1] = from_kgid_munged(user_ns, high);
 187         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 188
 189         if (write && ret == 0) {
 190                 low = make_kgid(user_ns, urange[0]);
 191                 high = make_kgid(user_ns, urange[1]);
 192                 if (!gid_valid(low) || !gid_valid(high))
 193                         return -EINVAL;
 194                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 195                         low = make_kgid(&init_user_ns, 1);
 196                         high = make_kgid(&init_user_ns, 0);
 197                 }
 198                 set_ping_group_range(table, low, high);
 199         }
 200
 201         return ret;
 202 }
 203
 204 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 205                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 206 {
 207         struct net *net = container_of(ctl->data, struct net,
 208                                        ipv4.tcp_congestion_control);
 209         char val[TCP_CA_NAME_MAX];
 210         struct ctl_table tbl = {
 211                 .data = val,
 212                 .maxlen = TCP_CA_NAME_MAX,
 213         };
 214         int ret;
 215
 216         tcp_get_default_congestion_control(net, val);
 217
 218         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 219         if (write && ret == 0)
 220                 ret = tcp_set_default_congestion_control(net, val);
 221         return ret;
 222 }
 223
 224 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 225                                                  int write,
 226                                                  void __user *buffer, size_t *lenp,
 227                                                  loff_t *ppos)
 228 {
 229         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 230         int ret;
 231
 232         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 233         if (!tbl.data)
 234                 return -ENOMEM;
 235         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 236         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 237         kfree(tbl.data);
 238         return ret;
 239 }
 240
 241 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 242                                            int write,
 243                                            void __user *buffer, size_t *lenp,
 244                                            loff_t *ppos)
 245 {
 246         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 247         int ret;
 248
 249         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 250         if (!tbl.data)
 251                 return -ENOMEM;
 252
 253         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 254         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 255         if (write && ret == 0)
 256                 ret = tcp_set_allowed_congestion_control(tbl.data);
 257         kfree(tbl.data);
 258         return ret;
 259 }
 260
 261 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 262                                  void __user *buffer, size_t *lenp,
 263                                  loff_t *ppos)
 264 {
 265         struct net *net = container_of(table->data, struct net,
 266             ipv4.sysctl_tcp_fastopen);
 267         struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
 268         struct tcp_fastopen_context *ctxt;
 269         u32  user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
 270         __le32 key[4];
 271         int ret, i;
 272
 273         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 274         if (!tbl.data)
 275                 return -ENOMEM;
 276
 277         rcu_read_lock();
 278         ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 279         if (ctxt)
 280                 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
 281         else
 282                 memset(key, 0, sizeof(key));
 283         rcu_read_unlock();
 284
 285         for (i = 0; i < ARRAY_SIZE(key); i++)
 286                 user_key[i] = le32_to_cpu(key[i]);
 287
 288         snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
 289                 user_key[0], user_key[1], user_key[2], user_key[3]);
 290         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 291
 292         if (write && ret == 0) {
 293                 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
 294                            user_key + 2, user_key + 3) != 4) {
 295                         ret = -EINVAL;
 296                         goto bad_key;
 297                 }
 298
 299                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 300                         key[i] = cpu_to_le32(user_key[i]);
 301
 302                 tcp_fastopen_reset_cipher(net, NULL, key,
 303                                           TCP_FASTOPEN_KEY_LENGTH);
 304         }
 305
 306 bad_key:
 307         pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 308                 user_key[0], user_key[1], user_key[2], user_key[3],
 309                (char *)tbl.data, ret);
 310         kfree(tbl.data);
 311         return ret;
 312 }
 313
 314 static void proc_configure_early_demux(int enabled, int protocol)
 315 {
 316         struct net_protocol *ipprot;
 317 #if IS_ENABLED(CONFIG_IPV6)
 318         struct inet6_protocol *ip6prot;
 319 #endif
 320
 321         rcu_read_lock();
 322
 323         ipprot = rcu_dereference(inet_protos[protocol]);
 324         if (ipprot)
 325                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 326                                                 NULL;
 327
 328 #if IS_ENABLED(CONFIG_IPV6)
 329         ip6prot = rcu_dereference(inet6_protos[protocol]);
 330         if (ip6prot)
 331                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 332                                                  NULL;
 333 #endif
 334         rcu_read_unlock();
 335 }
 336
 337 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 338                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 339 {
 340         int ret = 0;
 341
 342         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 343
 344         if (write && !ret) {
 345                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 346
 347                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 348         }
 349
 350         return ret;
 351 }
 352
 353 static int proc_udp_early_demux(struct ctl_table *table, int write,
 354                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 355 {
 356         int ret = 0;
 357
 358         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 359
 360         if (write && !ret) {
 361                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 362
 363                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 364         }
 365
 366         return ret;
 367 }
 368
 369 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 370                                              int write,
 371                                              void __user *buffer,
 372                                              size_t *lenp, loff_t *ppos)
 373 {
 374         struct net *net = container_of(table->data, struct net,
 375             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 376         int ret;
 377
 378         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 379         if (write && ret == 0)
 380                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 381
 382         return ret;
 383 }
 384
 385 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 386                                   int write,
 387                                   void __user *buffer, size_t *lenp,
 388                                   loff_t *ppos)
 389 {
 390         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 391         int ret;
 392
 393         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 394         if (!tbl.data)
 395                 return -ENOMEM;
 396         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 397         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 398         kfree(tbl.data);
 399
 400         return ret;
 401 }
 402
 403 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 404 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 405                                           void __user *buffer, size_t *lenp,
 406                                           loff_t *ppos)
 407 {
 408         struct net *net = container_of(table->data, struct net,
 409             ipv4.sysctl_fib_multipath_hash_policy);
 410         int ret;
 411
 412         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 413         if (write && ret == 0)
 414                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 415
 416         return ret;
 417 }
 418 #endif
 419
 420 static struct ctl_table ipv4_table[] = {
 421         {
 422                 .procname       = "tcp_max_orphans",
 423                 .data           = &sysctl_tcp_max_orphans,
 424                 .maxlen         = sizeof(int),
 425                 .mode           = 0644,
 426                 .proc_handler   = proc_dointvec
 427         },
 428         {
 429                 .procname       = "inet_peer_threshold",
 430                 .data           = &inet_peer_threshold,
 431                 .maxlen         = sizeof(int),
 432                 .mode           = 0644,
 433                 .proc_handler   = proc_dointvec
 434         },
 435         {
 436                 .procname       = "inet_peer_minttl",
 437                 .data           = &inet_peer_minttl,
 438                 .maxlen         = sizeof(int),
 439                 .mode           = 0644,
 440                 .proc_handler   = proc_dointvec_jiffies,
 441         },
 442         {
 443                 .procname       = "inet_peer_maxttl",
 444                 .data           = &inet_peer_maxttl,
 445                 .maxlen         = sizeof(int),
 446                 .mode           = 0644,
 447                 .proc_handler   = proc_dointvec_jiffies,
 448         },
 449         {
 450                 .procname       = "tcp_mem",
 451                 .maxlen         = sizeof(sysctl_tcp_mem),
 452                 .data           = &sysctl_tcp_mem,
 453                 .mode           = 0644,
 454                 .proc_handler   = proc_doulongvec_minmax,
 455         },
 456         {
 457                 .procname       = "tcp_low_latency",
 458                 .data           = &sysctl_tcp_low_latency,
 459                 .maxlen         = sizeof(int),
 460                 .mode           = 0644,
 461                 .proc_handler   = proc_dointvec
 462         },
 463 #ifdef CONFIG_NETLABEL
 464         {
 465                 .procname       = "cipso_cache_enable",
 466                 .data           = &cipso_v4_cache_enabled,
 467                 .maxlen         = sizeof(int),
 468                 .mode           = 0644,
 469                 .proc_handler   = proc_dointvec,
 470         },
 471         {
 472                 .procname       = "cipso_cache_bucket_size",
 473                 .data           = &cipso_v4_cache_bucketsize,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = proc_dointvec,
 477         },
 478         {
 479                 .procname       = "cipso_rbm_optfmt",
 480                 .data           = &cipso_v4_rbm_optfmt,
 481                 .maxlen         = sizeof(int),
 482                 .mode           = 0644,
 483                 .proc_handler   = proc_dointvec,
 484         },
 485         {
 486                 .procname       = "cipso_rbm_strictvalid",
 487                 .data           = &cipso_v4_rbm_strictvalid,
 488                 .maxlen         = sizeof(int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec,
 491         },
 492 #endif /* CONFIG_NETLABEL */
 493         {
 494                 .procname       = "tcp_available_congestion_control",
 495                 .maxlen         = TCP_CA_BUF_MAX,
 496                 .mode           = 0444,
 497                 .proc_handler   = proc_tcp_available_congestion_control,
 498         },
 499         {
 500                 .procname       = "tcp_allowed_congestion_control",
 501                 .maxlen         = TCP_CA_BUF_MAX,
 502                 .mode           = 0644,
 503                 .proc_handler   = proc_allowed_congestion_control,
 504         },
 505         {
 506                 .procname       = "tcp_available_ulp",
 507                 .maxlen         = TCP_ULP_BUF_MAX,
 508                 .mode           = 0444,
 509                 .proc_handler   = proc_tcp_available_ulp,
 510         },
 511         {
 512                 .procname       = "icmp_msgs_per_sec",
 513                 .data           = &sysctl_icmp_msgs_per_sec,
 514                 .maxlen         = sizeof(int),
 515                 .mode           = 0644,
 516                 .proc_handler   = proc_dointvec_minmax,
 517                 .extra1         = &zero,
 518         },
 519         {
 520                 .procname       = "icmp_msgs_burst",
 521                 .data           = &sysctl_icmp_msgs_burst,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = proc_dointvec_minmax,
 525                 .extra1         = &zero,
 526         },
 527         {
 528                 .procname       = "udp_mem",
 529                 .data           = &sysctl_udp_mem,
 530                 .maxlen         = sizeof(sysctl_udp_mem),
 531                 .mode           = 0644,
 532                 .proc_handler   = proc_doulongvec_minmax,
 533         },
 534         { }
 535 };
 536
 537 static struct ctl_table ipv4_net_table[] = {
 538         {
 539                 .procname       = "icmp_echo_ignore_all",
 540                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_dointvec
 544         },
 545         {
 546                 .procname       = "icmp_echo_ignore_broadcasts",
 547                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_dointvec
 551         },
 552         {
 553                 .procname       = "icmp_ignore_bogus_error_responses",
 554                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = proc_dointvec
 558         },
 559         {
 560                 .procname       = "icmp_errors_use_inbound_ifaddr",
 561                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 562                 .maxlen         = sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_dointvec
 565         },
 566         {
 567                 .procname       = "icmp_ratelimit",
 568                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = proc_dointvec_ms_jiffies,
 572         },
 573         {
 574                 .procname       = "icmp_ratemask",
 575                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 576                 .maxlen         = sizeof(int),
 577                 .mode           = 0644,
 578                 .proc_handler   = proc_dointvec
 579         },
 580         {
 581                 .procname       = "ping_group_range",
 582                 .data           = &init_net.ipv4.ping_group_range.range,
 583                 .maxlen         = sizeof(gid_t)*2,
 584                 .mode           = 0644,
 585                 .proc_handler   = ipv4_ping_group_range,
 586         },
 587         {
 588                 .procname       = "tcp_ecn",
 589                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = proc_dointvec
 593         },
 594         {
 595                 .procname       = "tcp_ecn_fallback",
 596                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = proc_dointvec
 600         },
 601         {
 602                 .procname       = "ip_dynaddr",
 603                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = proc_dointvec
 607         },
 608         {
 609                 .procname       = "ip_early_demux",
 610                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 611                 .maxlen         = sizeof(int),
 612                 .mode           = 0644,
 613                 .proc_handler   = proc_dointvec
 614         },
 615         {
 616                 .procname       = "udp_early_demux",
 617                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 618                 .maxlen         = sizeof(int),
 619                 .mode           = 0644,
 620                 .proc_handler   = proc_udp_early_demux
 621         },
 622         {
 623                 .procname       = "tcp_early_demux",
 624                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 625                 .maxlen         = sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = proc_tcp_early_demux
 628         },
 629         {
 630                 .procname       = "ip_default_ttl",
 631                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 632                 .maxlen         = sizeof(int),
 633                 .mode           = 0644,
 634                 .proc_handler   = proc_dointvec_minmax,
 635                 .extra1         = &ip_ttl_min,
 636                 .extra2         = &ip_ttl_max,
 637         },
 638         {
 639                 .procname       = "ip_local_port_range",
 640                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 641                 .data           = &init_net.ipv4.ip_local_ports.range,
 642                 .mode           = 0644,
 643                 .proc_handler   = ipv4_local_port_range,
 644         },
 645         {
 646                 .procname       = "ip_local_reserved_ports",
 647                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 648                 .maxlen         = 65536,
 649                 .mode           = 0644,
 650                 .proc_handler   = proc_do_large_bitmap,
 651         },
 652         {
 653                 .procname       = "ip_no_pmtu_disc",
 654                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 655                 .maxlen         = sizeof(int),
 656                 .mode           = 0644,
 657                 .proc_handler   = proc_dointvec
 658         },
 659         {
 660                 .procname       = "ip_forward_use_pmtu",
 661                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 662                 .maxlen         = sizeof(int),
 663                 .mode           = 0644,
 664                 .proc_handler   = proc_dointvec,
 665         },
 666         {
 667                 .procname       = "ip_nonlocal_bind",
 668                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 669                 .maxlen         = sizeof(int),
 670                 .mode           = 0644,
 671                 .proc_handler   = proc_dointvec
 672         },
 673         {
 674                 .procname       = "fwmark_reflect",
 675                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 676                 .maxlen         = sizeof(int),
 677                 .mode           = 0644,
 678                 .proc_handler   = proc_dointvec,
 679         },
 680         {
 681                 .procname       = "tcp_fwmark_accept",
 682                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 683                 .maxlen         = sizeof(int),
 684                 .mode           = 0644,
 685                 .proc_handler   = proc_dointvec,
 686         },
 687 #ifdef CONFIG_NET_L3_MASTER_DEV
 688         {
 689                 .procname       = "tcp_l3mdev_accept",
 690                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 691                 .maxlen         = sizeof(int),
 692                 .mode           = 0644,
 693                 .proc_handler   = proc_dointvec_minmax,
 694                 .extra1         = &zero,
 695                 .extra2         = &one,
 696         },
 697 #endif
 698         {
 699                 .procname       = "tcp_mtu_probing",
 700                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 701                 .maxlen         = sizeof(int),
 702                 .mode           = 0644,
 703                 .proc_handler   = proc_dointvec,
 704         },
 705         {
 706                 .procname       = "tcp_base_mss",
 707                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 708                 .maxlen         = sizeof(int),
 709                 .mode           = 0644,
 710                 .proc_handler   = proc_dointvec,
 711         },
 712         {
 713                 .procname       = "tcp_probe_threshold",
 714                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 715                 .maxlen         = sizeof(int),
 716                 .mode           = 0644,
 717                 .proc_handler   = proc_dointvec,
 718         },
 719         {
 720                 .procname       = "tcp_probe_interval",
 721                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 722                 .maxlen         = sizeof(int),
 723                 .mode           = 0644,
 724                 .proc_handler   = proc_dointvec,
 725         },
 726         {
 727                 .procname       = "igmp_link_local_mcast_reports",
 728                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 729                 .maxlen         = sizeof(int),
 730                 .mode           = 0644,
 731                 .proc_handler   = proc_dointvec
 732         },
 733         {
 734                 .procname       = "igmp_max_memberships",
 735                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 736                 .maxlen         = sizeof(int),
 737                 .mode           = 0644,
 738                 .proc_handler   = proc_dointvec
 739         },
 740         {
 741                 .procname       = "igmp_max_msf",
 742                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 743                 .maxlen         = sizeof(int),
 744                 .mode           = 0644,
 745                 .proc_handler   = proc_dointvec
 746         },
 747 #ifdef CONFIG_IP_MULTICAST
 748         {
 749                 .procname       = "igmp_qrv",
 750                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 751                 .maxlen         = sizeof(int),
 752                 .mode           = 0644,
 753                 .proc_handler   = proc_dointvec_minmax,
 754                 .extra1         = &one
 755         },
 756 #endif
 757         {
 758                 .procname       = "tcp_congestion_control",
 759                 .data           = &init_net.ipv4.tcp_congestion_control,
 760                 .mode           = 0644,
 761                 .maxlen         = TCP_CA_NAME_MAX,
 762                 .proc_handler   = proc_tcp_congestion_control,
 763         },
 764         {
 765                 .procname       = "tcp_keepalive_time",
 766                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 767                 .maxlen         = sizeof(int),
 768                 .mode           = 0644,
 769                 .proc_handler   = proc_dointvec_jiffies,
 770         },
 771         {
 772                 .procname       = "tcp_keepalive_probes",
 773                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 774                 .maxlen         = sizeof(int),
 775                 .mode           = 0644,
 776                 .proc_handler   = proc_dointvec
 777         },
 778         {
 779                 .procname       = "tcp_keepalive_intvl",
 780                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 781                 .maxlen         = sizeof(int),
 782                 .mode           = 0644,
 783                 .proc_handler   = proc_dointvec_jiffies,
 784         },
 785         {
 786                 .procname       = "tcp_syn_retries",
 787                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 788                 .maxlen         = sizeof(int),
 789                 .mode           = 0644,
 790                 .proc_handler   = proc_dointvec_minmax,
 791                 .extra1         = &tcp_syn_retries_min,
 792                 .extra2         = &tcp_syn_retries_max
 793         },
 794         {
 795                 .procname       = "tcp_synack_retries",
 796                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 797                 .maxlen         = sizeof(int),
 798                 .mode           = 0644,
 799                 .proc_handler   = proc_dointvec
 800         },
 801 #ifdef CONFIG_SYN_COOKIES
 802         {
 803                 .procname       = "tcp_syncookies",
 804                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 805                 .maxlen         = sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = proc_dointvec
 808         },
 809 #endif
 810         {
 811                 .procname       = "tcp_reordering",
 812                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 813                 .maxlen         = sizeof(int),
 814                 .mode           = 0644,
 815                 .proc_handler   = proc_dointvec
 816         },
 817         {
 818                 .procname       = "tcp_retries1",
 819                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 820                 .maxlen         = sizeof(int),
 821                 .mode           = 0644,
 822                 .proc_handler   = proc_dointvec_minmax,
 823                 .extra2         = &tcp_retr1_max
 824         },
 825         {
 826                 .procname       = "tcp_retries2",
 827                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 828                 .maxlen         = sizeof(int),
 829                 .mode           = 0644,
 830                 .proc_handler   = proc_dointvec
 831         },
 832         {
 833                 .procname       = "tcp_orphan_retries",
 834                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 835                 .maxlen         = sizeof(int),
 836                 .mode           = 0644,
 837                 .proc_handler   = proc_dointvec
 838         },
 839         {
 840                 .procname       = "tcp_fin_timeout",
 841                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 842                 .maxlen         = sizeof(int),
 843                 .mode           = 0644,
 844                 .proc_handler   = proc_dointvec_jiffies,
 845         },
 846         {
 847                 .procname       = "tcp_notsent_lowat",
 848                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 849                 .maxlen         = sizeof(unsigned int),
 850                 .mode           = 0644,
 851                 .proc_handler   = proc_douintvec,
 852         },
 853         {
 854                 .procname       = "tcp_tw_reuse",
 855                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 856                 .maxlen         = sizeof(int),
 857                 .mode           = 0644,
 858                 .proc_handler   = proc_dointvec_minmax,
 859                 .extra1         = &zero,
 860                 .extra2         = &two,
 861         },
 862         {
 863                 .procname       = "tcp_max_tw_buckets",
 864                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 865                 .maxlen         = sizeof(int),
 866                 .mode           = 0644,
 867                 .proc_handler   = proc_dointvec
 868         },
 869         {
 870                 .procname       = "tcp_max_syn_backlog",
 871                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 872                 .maxlen         = sizeof(int),
 873                 .mode           = 0644,
 874                 .proc_handler   = proc_dointvec
 875         },
 876         {
 877                 .procname       = "tcp_fastopen",
 878                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 879                 .maxlen         = sizeof(int),
 880                 .mode           = 0644,
 881                 .proc_handler   = proc_dointvec,
 882         },
 883         {
 884                 .procname       = "tcp_fastopen_key",
 885                 .mode           = 0600,
 886                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 887                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 888                 .proc_handler   = proc_tcp_fastopen_key,
 889         },
 890         {
 891                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
 892                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
 893                 .maxlen         = sizeof(int),
 894                 .mode           = 0644,
 895                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
 896                 .extra1         = &zero,
 897         },
 898 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 899         {
 900                 .procname       = "fib_multipath_use_neigh",
 901                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
 902                 .maxlen         = sizeof(int),
 903                 .mode           = 0644,
 904                 .proc_handler   = proc_dointvec_minmax,
 905                 .extra1         = &zero,
 906                 .extra2         = &one,
 907         },
 908         {
 909                 .procname       = "fib_multipath_hash_policy",
 910                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
 911                 .maxlen         = sizeof(int),
 912                 .mode           = 0644,
 913                 .proc_handler   = proc_fib_multipath_hash_policy,
 914                 .extra1         = &zero,
 915                 .extra2         = &one,
 916         },
 917 #endif
 918         {
 919                 .procname       = "ip_unprivileged_port_start",
 920                 .maxlen         = sizeof(int),
 921                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
 922                 .mode           = 0644,
 923                 .proc_handler   = ipv4_privileged_ports,
 924         },
 925 #ifdef CONFIG_NET_L3_MASTER_DEV
 926         {
 927                 .procname       = "udp_l3mdev_accept",
 928                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
 929                 .maxlen         = sizeof(int),
 930                 .mode           = 0644,
 931                 .proc_handler   = proc_dointvec_minmax,
 932                 .extra1         = &zero,
 933                 .extra2         = &one,
 934         },
 935 #endif
 936         {
 937                 .procname       = "tcp_sack",
 938                 .data           = &init_net.ipv4.sysctl_tcp_sack,
 939                 .maxlen         = sizeof(int),
 940                 .mode           = 0644,
 941                 .proc_handler   = proc_dointvec
 942         },
 943         {
 944                 .procname       = "tcp_window_scaling",
 945                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
 946                 .maxlen         = sizeof(int),
 947                 .mode           = 0644,
 948                 .proc_handler   = proc_dointvec
 949         },
 950         {
 951                 .procname       = "tcp_timestamps",
 952                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
 953                 .maxlen         = sizeof(int),
 954                 .mode           = 0644,
 955                 .proc_handler   = proc_dointvec
 956         },
 957         {
 958                 .procname       = "tcp_early_retrans",
 959                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
 960                 .maxlen         = sizeof(int),
 961                 .mode           = 0644,
 962                 .proc_handler   = proc_dointvec_minmax,
 963                 .extra1         = &zero,
 964                 .extra2         = &four,
 965         },
 966         {
 967                 .procname       = "tcp_recovery",
 968                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
 969                 .maxlen         = sizeof(int),
 970                 .mode           = 0644,
 971                 .proc_handler   = proc_dointvec,
 972         },
 973         {
 974                 .procname       = "tcp_thin_linear_timeouts",
 975                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
 976                 .maxlen         = sizeof(int),
 977                 .mode           = 0644,
 978                 .proc_handler   = proc_dointvec
 979         },
 980         {
 981                 .procname       = "tcp_slow_start_after_idle",
 982                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
 983                 .maxlen         = sizeof(int),
 984                 .mode           = 0644,
 985                 .proc_handler   = proc_dointvec
 986         },
 987         {
 988                 .procname       = "tcp_retrans_collapse",
 989                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
 990                 .maxlen         = sizeof(int),
 991                 .mode           = 0644,
 992                 .proc_handler   = proc_dointvec
 993         },
 994         {
 995                 .procname       = "tcp_stdurg",
 996                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
 997                 .maxlen         = sizeof(int),
 998                 .mode           = 0644,
 999                 .proc_handler   = proc_dointvec
1000         },
1001         {
1002                 .procname       = "tcp_rfc1337",
1003                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1004                 .maxlen         = sizeof(int),
1005                 .mode           = 0644,
1006                 .proc_handler   = proc_dointvec
1007         },
1008         {
1009                 .procname       = "tcp_abort_on_overflow",
1010                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1011                 .maxlen         = sizeof(int),
1012                 .mode           = 0644,
1013                 .proc_handler   = proc_dointvec
1014         },
1015         {
1016                 .procname       = "tcp_fack",
1017                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1018                 .maxlen         = sizeof(int),
1019                 .mode           = 0644,
1020                 .proc_handler   = proc_dointvec
1021         },
1022         {
1023                 .procname       = "tcp_max_reordering",
1024                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1025                 .maxlen         = sizeof(int),
1026                 .mode           = 0644,
1027                 .proc_handler   = proc_dointvec
1028         },
1029         {
1030                 .procname       = "tcp_dsack",
1031                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1032                 .maxlen         = sizeof(int),
1033                 .mode           = 0644,
1034                 .proc_handler   = proc_dointvec
1035         },
1036         {
1037                 .procname       = "tcp_app_win",
1038                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1039                 .maxlen         = sizeof(int),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_dointvec
1042         },
1043         {
1044                 .procname       = "tcp_adv_win_scale",
1045                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1046                 .maxlen         = sizeof(int),
1047                 .mode           = 0644,
1048                 .proc_handler   = proc_dointvec_minmax,
1049                 .extra1         = &tcp_adv_win_scale_min,
1050                 .extra2         = &tcp_adv_win_scale_max,
1051         },
1052         {
1053                 .procname       = "tcp_frto",
1054                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1055                 .maxlen         = sizeof(int),
1056                 .mode           = 0644,
1057                 .proc_handler   = proc_dointvec
1058         },
1059         {
1060                 .procname       = "tcp_no_metrics_save",
1061                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1062                 .maxlen         = sizeof(int),
1063                 .mode           = 0644,
1064                 .proc_handler   = proc_dointvec,
1065         },
1066         {
1067                 .procname       = "tcp_moderate_rcvbuf",
1068                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1069                 .maxlen         = sizeof(int),
1070                 .mode           = 0644,
1071                 .proc_handler   = proc_dointvec,
1072         },
1073         {
1074                 .procname       = "tcp_tso_win_divisor",
1075                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1076                 .maxlen         = sizeof(int),
1077                 .mode           = 0644,
1078                 .proc_handler   = proc_dointvec,
1079         },
1080         {
1081                 .procname       = "tcp_workaround_signed_windows",
1082                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1083                 .maxlen         = sizeof(int),
1084                 .mode           = 0644,
1085                 .proc_handler   = proc_dointvec
1086         },
1087         {
1088                 .procname       = "tcp_limit_output_bytes",
1089                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1090                 .maxlen         = sizeof(int),
1091                 .mode           = 0644,
1092                 .proc_handler   = proc_dointvec
1093         },
1094         {
1095                 .procname       = "tcp_challenge_ack_limit",
1096                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1097                 .maxlen         = sizeof(int),
1098                 .mode           = 0644,
1099                 .proc_handler   = proc_dointvec
1100         },
1101         {
1102                 .procname       = "tcp_min_tso_segs",
1103                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1104                 .maxlen         = sizeof(int),
1105                 .mode           = 0644,
1106                 .proc_handler   = proc_dointvec_minmax,
1107                 .extra1         = &one,
1108                 .extra2         = &gso_max_segs,
1109         },
1110         {
1111                 .procname       = "tcp_min_rtt_wlen",
1112                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1113                 .maxlen         = sizeof(int),
1114                 .mode           = 0644,
1115                 .proc_handler   = proc_dointvec
1116         },
1117         {
1118                 .procname       = "tcp_autocorking",
1119                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1120                 .maxlen         = sizeof(int),
1121                 .mode           = 0644,
1122                 .proc_handler   = proc_dointvec_minmax,
1123                 .extra1         = &zero,
1124                 .extra2         = &one,
1125         },
1126         {
1127                 .procname       = "tcp_invalid_ratelimit",
1128                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1129                 .maxlen         = sizeof(int),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dointvec_ms_jiffies,
1132         },
1133         {
1134                 .procname       = "tcp_pacing_ss_ratio",
1135                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1136                 .maxlen         = sizeof(int),
1137                 .mode           = 0644,
1138                 .proc_handler   = proc_dointvec_minmax,
1139                 .extra1         = &zero,
1140                 .extra2         = &thousand,
1141         },
1142         {
1143                 .procname       = "tcp_pacing_ca_ratio",
1144                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1145                 .maxlen         = sizeof(int),
1146                 .mode           = 0644,
1147                 .proc_handler   = proc_dointvec_minmax,
1148                 .extra1         = &zero,
1149                 .extra2         = &thousand,
1150         },
1151         {
1152                 .procname       = "tcp_wmem",
1153                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1154                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1155                 .mode           = 0644,
1156                 .proc_handler   = proc_dointvec_minmax,
1157                 .extra1         = &one,
1158         },
1159         {
1160                 .procname       = "tcp_rmem",
1161                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1162                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1163                 .mode           = 0644,
1164                 .proc_handler   = proc_dointvec_minmax,
1165                 .extra1         = &one,
1166         },
1167         {
1168                 .procname       = "tcp_comp_sack_delay_ns",
1169                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1170                 .maxlen         = sizeof(unsigned long),
1171                 .mode           = 0644,
1172                 .proc_handler   = proc_doulongvec_minmax,
1173         },
1174         {
1175                 .procname       = "tcp_comp_sack_nr",
1176                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1177                 .maxlen         = sizeof(int),
1178                 .mode           = 0644,
1179                 .proc_handler   = proc_dointvec_minmax,
1180                 .extra1         = &zero,
1181                 .extra2         = &comp_sack_nr_max,
1182         },
1183         {
1184                 .procname       = "udp_rmem_min",
1185                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1186                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1187                 .mode           = 0644,
1188                 .proc_handler   = proc_dointvec_minmax,
1189                 .extra1         = &one
1190         },
1191         {
1192                 .procname       = "udp_wmem_min",
1193                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1194                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1195                 .mode           = 0644,
1196                 .proc_handler   = proc_dointvec_minmax,
1197                 .extra1         = &one
1198         },
1199         { }
1200 };
1201
1202 static __net_init int ipv4_sysctl_init_net(struct net *net)
1203 {
1204         struct ctl_table *table;
1205
1206         table = ipv4_net_table;
1207         if (!net_eq(net, &init_net)) {
1208                 int i;
1209
1210                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1211                 if (!table)
1212                         goto err_alloc;
1213
1214                 /* Update the variables to point into the current struct net */
1215                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1216                         table[i].data += (void *)net - (void *)&init_net;
1217         }
1218
1219         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1220         if (!net->ipv4.ipv4_hdr)
1221                 goto err_reg;
1222
1223         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1224         if (!net->ipv4.sysctl_local_reserved_ports)
1225                 goto err_ports;
1226
1227         return 0;
1228
1229 err_ports:
1230         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1231 err_reg:
1232         if (!net_eq(net, &init_net))
1233                 kfree(table);
1234 err_alloc:
1235         return -ENOMEM;
1236 }
1237
1238 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1239 {
1240         struct ctl_table *table;
1241
1242         kfree(net->ipv4.sysctl_local_reserved_ports);
1243         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1244         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1245         kfree(table);
1246 }
1247
1248 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1249         .init = ipv4_sysctl_init_net,
1250         .exit = ipv4_sysctl_exit_net,
1251 };
1252
1253 static __init int sysctl_ipv4_init(void)
1254 {
1255         struct ctl_table_header *hdr;
1256
1257         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1258         if (!hdr)
1259                 return -ENOMEM;
1260
1261         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1262                 unregister_net_sysctl_table(hdr);
1263                 return -ENOMEM;
1264         }
1265
1266         return 0;
1267 }
1268
1269 __initcall(sysctl_ipv4_init);