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