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