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         u32  user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
 269         __le32 key[4];
 270         int ret, i;
 271
 272         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 273         if (!tbl.data)
 274                 return -ENOMEM;
 275
 276         rcu_read_lock();
 277         ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 278         if (ctxt)
 279                 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
 280         else
 281                 memset(key, 0, sizeof(key));
 282         rcu_read_unlock();
 283
 284         for (i = 0; i < ARRAY_SIZE(key); i++)
 285                 user_key[i] = le32_to_cpu(key[i]);
 286
 287         snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
 288                 user_key[0], user_key[1], user_key[2], user_key[3]);
 289         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 290
 291         if (write && ret == 0) {
 292                 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
 293                            user_key + 2, user_key + 3) != 4) {
 294                         ret = -EINVAL;
 295                         goto bad_key;
 296                 }
 297
 298                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 299                         key[i] = cpu_to_le32(user_key[i]);
 300
 301                 tcp_fastopen_reset_cipher(net, NULL, key,
 302                                           TCP_FASTOPEN_KEY_LENGTH);
 303         }
 304
 305 bad_key:
 306         pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 307                 user_key[0], user_key[1], user_key[2], user_key[3],
 308                (char *)tbl.data, ret);
 309         kfree(tbl.data);
 310         return ret;
 311 }
 312
 313 static void proc_configure_early_demux(int enabled, int protocol)
 314 {
 315         struct net_protocol *ipprot;
 316 #if IS_ENABLED(CONFIG_IPV6)
 317         struct inet6_protocol *ip6prot;
 318 #endif
 319
 320         rcu_read_lock();
 321
 322         ipprot = rcu_dereference(inet_protos[protocol]);
 323         if (ipprot)
 324                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 325                                                 NULL;
 326
 327 #if IS_ENABLED(CONFIG_IPV6)
 328         ip6prot = rcu_dereference(inet6_protos[protocol]);
 329         if (ip6prot)
 330                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 331                                                  NULL;
 332 #endif
 333         rcu_read_unlock();
 334 }
 335
 336 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 337                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 338 {
 339         int ret = 0;
 340
 341         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 342
 343         if (write && !ret) {
 344                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 345
 346                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 347         }
 348
 349         return ret;
 350 }
 351
 352 static int proc_udp_early_demux(struct ctl_table *table, int write,
 353                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 354 {
 355         int ret = 0;
 356
 357         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 358
 359         if (write && !ret) {
 360                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 361
 362                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 363         }
 364
 365         return ret;
 366 }
 367
 368 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 369                                              int write,
 370                                              void __user *buffer,
 371                                              size_t *lenp, loff_t *ppos)
 372 {
 373         struct net *net = container_of(table->data, struct net,
 374             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 375         int ret;
 376
 377         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 378         if (write && ret == 0)
 379                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 380
 381         return ret;
 382 }
 383
 384 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 385                                   int write,
 386                                   void __user *buffer, size_t *lenp,
 387                                   loff_t *ppos)
 388 {
 389         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 390         int ret;
 391
 392         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 393         if (!tbl.data)
 394                 return -ENOMEM;
 395         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 396         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 397         kfree(tbl.data);
 398
 399         return ret;
 400 }
 401
 402 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 403 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 404                                           void __user *buffer, size_t *lenp,
 405                                           loff_t *ppos)
 406 {
 407         struct net *net = container_of(table->data, struct net,
 408             ipv4.sysctl_fib_multipath_hash_policy);
 409         int ret;
 410
 411         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 412         if (write && ret == 0)
 413                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 414
 415         return ret;
 416 }
 417 #endif
 418
 419 static struct ctl_table ipv4_table[] = {
 420         {
 421                 .procname       = "tcp_max_orphans",
 422                 .data           = &sysctl_tcp_max_orphans,
 423                 .maxlen         = sizeof(int),
 424                 .mode           = 0644,
 425                 .proc_handler   = proc_dointvec
 426         },
 427         {
 428                 .procname       = "inet_peer_threshold",
 429                 .data           = &inet_peer_threshold,
 430                 .maxlen         = sizeof(int),
 431                 .mode           = 0644,
 432                 .proc_handler   = proc_dointvec
 433         },
 434         {
 435                 .procname       = "inet_peer_minttl",
 436                 .data           = &inet_peer_minttl,
 437                 .maxlen         = sizeof(int),
 438                 .mode           = 0644,
 439                 .proc_handler   = proc_dointvec_jiffies,
 440         },
 441         {
 442                 .procname       = "inet_peer_maxttl",
 443                 .data           = &inet_peer_maxttl,
 444                 .maxlen         = sizeof(int),
 445                 .mode           = 0644,
 446                 .proc_handler   = proc_dointvec_jiffies,
 447         },
 448         {
 449                 .procname       = "tcp_mem",
 450                 .maxlen         = sizeof(sysctl_tcp_mem),
 451                 .data           = &sysctl_tcp_mem,
 452                 .mode           = 0644,
 453                 .proc_handler   = proc_doulongvec_minmax,
 454         },
 455         {
 456                 .procname       = "tcp_low_latency",
 457                 .data           = &sysctl_tcp_low_latency,
 458                 .maxlen         = sizeof(int),
 459                 .mode           = 0644,
 460                 .proc_handler   = proc_dointvec
 461         },
 462 #ifdef CONFIG_NETLABEL
 463         {
 464                 .procname       = "cipso_cache_enable",
 465                 .data           = &cipso_v4_cache_enabled,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec,
 469         },
 470         {
 471                 .procname       = "cipso_cache_bucket_size",
 472                 .data           = &cipso_v4_cache_bucketsize,
 473                 .maxlen         = sizeof(int),
 474                 .mode           = 0644,
 475                 .proc_handler   = proc_dointvec,
 476         },
 477         {
 478                 .procname       = "cipso_rbm_optfmt",
 479                 .data           = &cipso_v4_rbm_optfmt,
 480                 .maxlen         = sizeof(int),
 481                 .mode           = 0644,
 482                 .proc_handler   = proc_dointvec,
 483         },
 484         {
 485                 .procname       = "cipso_rbm_strictvalid",
 486                 .data           = &cipso_v4_rbm_strictvalid,
 487                 .maxlen         = sizeof(int),
 488                 .mode           = 0644,
 489                 .proc_handler   = proc_dointvec,
 490         },
 491 #endif /* CONFIG_NETLABEL */
 492         {
 493                 .procname       = "tcp_available_congestion_control",
 494                 .maxlen         = TCP_CA_BUF_MAX,
 495                 .mode           = 0444,
 496                 .proc_handler   = proc_tcp_available_congestion_control,
 497         },
 498         {
 499                 .procname       = "tcp_allowed_congestion_control",
 500                 .maxlen         = TCP_CA_BUF_MAX,
 501                 .mode           = 0644,
 502                 .proc_handler   = proc_allowed_congestion_control,
 503         },
 504         {
 505                 .procname       = "tcp_available_ulp",
 506                 .maxlen         = TCP_ULP_BUF_MAX,
 507                 .mode           = 0444,
 508                 .proc_handler   = proc_tcp_available_ulp,
 509         },
 510         {
 511                 .procname       = "icmp_msgs_per_sec",
 512                 .data           = &sysctl_icmp_msgs_per_sec,
 513                 .maxlen         = sizeof(int),
 514                 .mode           = 0644,
 515                 .proc_handler   = proc_dointvec_minmax,
 516                 .extra1         = &zero,
 517         },
 518         {
 519                 .procname       = "icmp_msgs_burst",
 520                 .data           = &sysctl_icmp_msgs_burst,
 521                 .maxlen         = sizeof(int),
 522                 .mode           = 0644,
 523                 .proc_handler   = proc_dointvec_minmax,
 524                 .extra1         = &zero,
 525         },
 526         {
 527                 .procname       = "udp_mem",
 528                 .data           = &sysctl_udp_mem,
 529                 .maxlen         = sizeof(sysctl_udp_mem),
 530                 .mode           = 0644,
 531                 .proc_handler   = proc_doulongvec_minmax,
 532         },
 533         { }
 534 };
 535
 536 static struct ctl_table ipv4_net_table[] = {
 537         {
 538                 .procname       = "icmp_echo_ignore_all",
 539                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 540                 .maxlen         = sizeof(int),
 541                 .mode           = 0644,
 542                 .proc_handler   = proc_dointvec
 543         },
 544         {
 545                 .procname       = "icmp_echo_ignore_broadcasts",
 546                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 547                 .maxlen         = sizeof(int),
 548                 .mode           = 0644,
 549                 .proc_handler   = proc_dointvec
 550         },
 551         {
 552                 .procname       = "icmp_ignore_bogus_error_responses",
 553                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 554                 .maxlen         = sizeof(int),
 555                 .mode           = 0644,
 556                 .proc_handler   = proc_dointvec
 557         },
 558         {
 559                 .procname       = "icmp_errors_use_inbound_ifaddr",
 560                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = proc_dointvec
 564         },
 565         {
 566                 .procname       = "icmp_ratelimit",
 567                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 568                 .maxlen         = sizeof(int),
 569                 .mode           = 0644,
 570                 .proc_handler   = proc_dointvec_ms_jiffies,
 571         },
 572         {
 573                 .procname       = "icmp_ratemask",
 574                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = proc_dointvec
 578         },
 579         {
 580                 .procname       = "ping_group_range",
 581                 .data           = &init_net.ipv4.ping_group_range.range,
 582                 .maxlen         = sizeof(gid_t)*2,
 583                 .mode           = 0644,
 584                 .proc_handler   = ipv4_ping_group_range,
 585         },
 586         {
 587                 .procname       = "tcp_ecn",
 588                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = proc_dointvec
 592         },
 593         {
 594                 .procname       = "tcp_ecn_fallback",
 595                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dointvec
 599         },
 600         {
 601                 .procname       = "ip_dynaddr",
 602                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dointvec
 606         },
 607         {
 608                 .procname       = "ip_early_demux",
 609                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 610                 .maxlen         = sizeof(int),
 611                 .mode           = 0644,
 612                 .proc_handler   = proc_dointvec
 613         },
 614         {
 615                 .procname       = "udp_early_demux",
 616                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 617                 .maxlen         = sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = proc_udp_early_demux
 620         },
 621         {
 622                 .procname       = "tcp_early_demux",
 623                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 624                 .maxlen         = sizeof(int),
 625                 .mode           = 0644,
 626                 .proc_handler   = proc_tcp_early_demux
 627         },
 628         {
 629                 .procname       = "ip_default_ttl",
 630                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = proc_dointvec_minmax,
 634                 .extra1         = &ip_ttl_min,
 635                 .extra2         = &ip_ttl_max,
 636         },
 637         {
 638                 .procname       = "ip_local_port_range",
 639                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 640                 .data           = &init_net.ipv4.ip_local_ports.range,
 641                 .mode           = 0644,
 642                 .proc_handler   = ipv4_local_port_range,
 643         },
 644         {
 645                 .procname       = "ip_local_reserved_ports",
 646                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 647                 .maxlen         = 65536,
 648                 .mode           = 0644,
 649                 .proc_handler   = proc_do_large_bitmap,
 650         },
 651         {
 652                 .procname       = "ip_no_pmtu_disc",
 653                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 654                 .maxlen         = sizeof(int),
 655                 .mode           = 0644,
 656                 .proc_handler   = proc_dointvec
 657         },
 658         {
 659                 .procname       = "ip_forward_use_pmtu",
 660                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 661                 .maxlen         = sizeof(int),
 662                 .mode           = 0644,
 663                 .proc_handler   = proc_dointvec,
 664         },
 665         {
 666                 .procname       = "ip_nonlocal_bind",
 667                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 668                 .maxlen         = sizeof(int),
 669                 .mode           = 0644,
 670                 .proc_handler   = proc_dointvec
 671         },
 672         {
 673                 .procname       = "fwmark_reflect",
 674                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 675                 .maxlen         = sizeof(int),
 676                 .mode           = 0644,
 677                 .proc_handler   = proc_dointvec,
 678         },
 679         {
 680                 .procname       = "tcp_fwmark_accept",
 681                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 682                 .maxlen         = sizeof(int),
 683                 .mode           = 0644,
 684                 .proc_handler   = proc_dointvec,
 685         },
 686 #ifdef CONFIG_NET_L3_MASTER_DEV
 687         {
 688                 .procname       = "tcp_l3mdev_accept",
 689                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 690                 .maxlen         = sizeof(int),
 691                 .mode           = 0644,
 692                 .proc_handler   = proc_dointvec_minmax,
 693                 .extra1         = &zero,
 694                 .extra2         = &one,
 695         },
 696 #endif
 697         {
 698                 .procname       = "tcp_mtu_probing",
 699                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 700                 .maxlen         = sizeof(int),
 701                 .mode           = 0644,
 702                 .proc_handler   = proc_dointvec,
 703         },
 704         {
 705                 .procname       = "tcp_base_mss",
 706                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 707                 .maxlen         = sizeof(int),
 708                 .mode           = 0644,
 709                 .proc_handler   = proc_dointvec,
 710         },
 711         {
 712                 .procname       = "tcp_probe_threshold",
 713                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 714                 .maxlen         = sizeof(int),
 715                 .mode           = 0644,
 716                 .proc_handler   = proc_dointvec,
 717         },
 718         {
 719                 .procname       = "tcp_probe_interval",
 720                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 721                 .maxlen         = sizeof(int),
 722                 .mode           = 0644,
 723                 .proc_handler   = proc_dointvec,
 724         },
 725         {
 726                 .procname       = "igmp_link_local_mcast_reports",
 727                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 728                 .maxlen         = sizeof(int),
 729                 .mode           = 0644,
 730                 .proc_handler   = proc_dointvec
 731         },
 732         {
 733                 .procname       = "igmp_max_memberships",
 734                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 735                 .maxlen         = sizeof(int),
 736                 .mode           = 0644,
 737                 .proc_handler   = proc_dointvec
 738         },
 739         {
 740                 .procname       = "igmp_max_msf",
 741                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 742                 .maxlen         = sizeof(int),
 743                 .mode           = 0644,
 744                 .proc_handler   = proc_dointvec
 745         },
 746 #ifdef CONFIG_IP_MULTICAST
 747         {
 748                 .procname       = "igmp_qrv",
 749                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 750                 .maxlen         = sizeof(int),
 751                 .mode           = 0644,
 752                 .proc_handler   = proc_dointvec_minmax,
 753                 .extra1         = &one
 754         },
 755 #endif
 756         {
 757                 .procname       = "tcp_congestion_control",
 758                 .data           = &init_net.ipv4.tcp_congestion_control,
 759                 .mode           = 0644,
 760                 .maxlen         = TCP_CA_NAME_MAX,
 761                 .proc_handler   = proc_tcp_congestion_control,
 762         },
 763         {
 764                 .procname       = "tcp_keepalive_time",
 765                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 766                 .maxlen         = sizeof(int),
 767                 .mode           = 0644,
 768                 .proc_handler   = proc_dointvec_jiffies,
 769         },
 770         {
 771                 .procname       = "tcp_keepalive_probes",
 772                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 773                 .maxlen         = sizeof(int),
 774                 .mode           = 0644,
 775                 .proc_handler   = proc_dointvec
 776         },
 777         {
 778                 .procname       = "tcp_keepalive_intvl",
 779                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 780                 .maxlen         = sizeof(int),
 781                 .mode           = 0644,
 782                 .proc_handler   = proc_dointvec_jiffies,
 783         },
 784         {
 785                 .procname       = "tcp_syn_retries",
 786                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 787                 .maxlen         = sizeof(int),
 788                 .mode           = 0644,
 789                 .proc_handler   = proc_dointvec_minmax,
 790                 .extra1         = &tcp_syn_retries_min,
 791                 .extra2         = &tcp_syn_retries_max
 792         },
 793         {
 794                 .procname       = "tcp_synack_retries",
 795                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = proc_dointvec
 799         },
 800 #ifdef CONFIG_SYN_COOKIES
 801         {
 802                 .procname       = "tcp_syncookies",
 803                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 804                 .maxlen         = sizeof(int),
 805                 .mode           = 0644,
 806                 .proc_handler   = proc_dointvec
 807         },
 808 #endif
 809         {
 810                 .procname       = "tcp_reordering",
 811                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 812                 .maxlen         = sizeof(int),
 813                 .mode           = 0644,
 814                 .proc_handler   = proc_dointvec
 815         },
 816         {
 817                 .procname       = "tcp_retries1",
 818                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 819                 .maxlen         = sizeof(int),
 820                 .mode           = 0644,
 821                 .proc_handler   = proc_dointvec_minmax,
 822                 .extra2         = &tcp_retr1_max
 823         },
 824         {
 825                 .procname       = "tcp_retries2",
 826                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = proc_dointvec
 830         },
 831         {
 832                 .procname       = "tcp_orphan_retries",
 833                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 834                 .maxlen         = sizeof(int),
 835                 .mode           = 0644,
 836                 .proc_handler   = proc_dointvec
 837         },
 838         {
 839                 .procname       = "tcp_fin_timeout",
 840                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 841                 .maxlen         = sizeof(int),
 842                 .mode           = 0644,
 843                 .proc_handler   = proc_dointvec_jiffies,
 844         },
 845         {
 846                 .procname       = "tcp_notsent_lowat",
 847                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 848                 .maxlen         = sizeof(unsigned int),
 849                 .mode           = 0644,
 850                 .proc_handler   = proc_douintvec,
 851         },
 852         {
 853                 .procname       = "tcp_tw_reuse",
 854                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 855                 .maxlen         = sizeof(int),
 856                 .mode           = 0644,
 857                 .proc_handler   = proc_dointvec_minmax,
 858                 .extra1         = &zero,
 859                 .extra2         = &two,
 860         },
 861         {
 862                 .procname       = "tcp_max_tw_buckets",
 863                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 864                 .maxlen         = sizeof(int),
 865                 .mode           = 0644,
 866                 .proc_handler   = proc_dointvec
 867         },
 868         {
 869                 .procname       = "tcp_max_syn_backlog",
 870                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 871                 .maxlen         = sizeof(int),
 872                 .mode           = 0644,
 873                 .proc_handler   = proc_dointvec
 874         },
 875         {
 876                 .procname       = "tcp_fastopen",
 877                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 878                 .maxlen         = sizeof(int),
 879                 .mode           = 0644,
 880                 .proc_handler   = proc_dointvec,
 881         },
 882         {
 883                 .procname       = "tcp_fastopen_key",
 884                 .mode           = 0600,
 885                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 886                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 887                 .proc_handler   = proc_tcp_fastopen_key,
 888         },
 889         {
 890                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
 891                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
 892                 .maxlen         = sizeof(int),
 893                 .mode           = 0644,
 894                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
 895                 .extra1         = &zero,
 896         },
 897 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 898         {
 899                 .procname       = "fib_multipath_use_neigh",
 900                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
 901                 .maxlen         = sizeof(int),
 902                 .mode           = 0644,
 903                 .proc_handler   = proc_dointvec_minmax,
 904                 .extra1         = &zero,
 905                 .extra2         = &one,
 906         },
 907         {
 908                 .procname       = "fib_multipath_hash_policy",
 909                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
 910                 .maxlen         = sizeof(int),
 911                 .mode           = 0644,
 912                 .proc_handler   = proc_fib_multipath_hash_policy,
 913                 .extra1         = &zero,
 914                 .extra2         = &one,
 915         },
 916 #endif
 917         {
 918                 .procname       = "ip_unprivileged_port_start",
 919                 .maxlen         = sizeof(int),
 920                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
 921                 .mode           = 0644,
 922                 .proc_handler   = ipv4_privileged_ports,
 923         },
 924 #ifdef CONFIG_NET_L3_MASTER_DEV
 925         {
 926                 .procname       = "udp_l3mdev_accept",
 927                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
 928                 .maxlen         = sizeof(int),
 929                 .mode           = 0644,
 930                 .proc_handler   = proc_dointvec_minmax,
 931                 .extra1         = &zero,
 932                 .extra2         = &one,
 933         },
 934 #endif
 935         {
 936                 .procname       = "tcp_sack",
 937                 .data           = &init_net.ipv4.sysctl_tcp_sack,
 938                 .maxlen         = sizeof(int),
 939                 .mode           = 0644,
 940                 .proc_handler   = proc_dointvec
 941         },
 942         {
 943                 .procname       = "tcp_window_scaling",
 944                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
 945                 .maxlen         = sizeof(int),
 946                 .mode           = 0644,
 947                 .proc_handler   = proc_dointvec
 948         },
 949         {
 950                 .procname       = "tcp_timestamps",
 951                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
 952                 .maxlen         = sizeof(int),
 953                 .mode           = 0644,
 954                 .proc_handler   = proc_dointvec
 955         },
 956         {
 957                 .procname       = "tcp_early_retrans",
 958                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
 959                 .maxlen         = sizeof(int),
 960                 .mode           = 0644,
 961                 .proc_handler   = proc_dointvec_minmax,
 962                 .extra1         = &zero,
 963                 .extra2         = &four,
 964         },
 965         {
 966                 .procname       = "tcp_recovery",
 967                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
 968                 .maxlen         = sizeof(int),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_dointvec,
 971         },
 972         {
 973                 .procname       = "tcp_thin_linear_timeouts",
 974                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
 975                 .maxlen         = sizeof(int),
 976                 .mode           = 0644,
 977                 .proc_handler   = proc_dointvec
 978         },
 979         {
 980                 .procname       = "tcp_slow_start_after_idle",
 981                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
 982                 .maxlen         = sizeof(int),
 983                 .mode           = 0644,
 984                 .proc_handler   = proc_dointvec
 985         },
 986         {
 987                 .procname       = "tcp_retrans_collapse",
 988                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
 989                 .maxlen         = sizeof(int),
 990                 .mode           = 0644,
 991                 .proc_handler   = proc_dointvec
 992         },
 993         {
 994                 .procname       = "tcp_stdurg",
 995                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
 996                 .maxlen         = sizeof(int),
 997                 .mode           = 0644,
 998                 .proc_handler   = proc_dointvec
 999         },
1000         {
1001                 .procname       = "tcp_rfc1337",
1002                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1003                 .maxlen         = sizeof(int),
1004                 .mode           = 0644,
1005                 .proc_handler   = proc_dointvec
1006         },
1007         {
1008                 .procname       = "tcp_abort_on_overflow",
1009                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1010                 .maxlen         = sizeof(int),
1011                 .mode           = 0644,
1012                 .proc_handler   = proc_dointvec
1013         },
1014         {
1015                 .procname       = "tcp_fack",
1016                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1017                 .maxlen         = sizeof(int),
1018                 .mode           = 0644,
1019                 .proc_handler   = proc_dointvec
1020         },
1021         {
1022                 .procname       = "tcp_max_reordering",
1023                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1024                 .maxlen         = sizeof(int),
1025                 .mode           = 0644,
1026                 .proc_handler   = proc_dointvec
1027         },
1028         {
1029                 .procname       = "tcp_dsack",
1030                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1031                 .maxlen         = sizeof(int),
1032                 .mode           = 0644,
1033                 .proc_handler   = proc_dointvec
1034         },
1035         {
1036                 .procname       = "tcp_app_win",
1037                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1038                 .maxlen         = sizeof(int),
1039                 .mode           = 0644,
1040                 .proc_handler   = proc_dointvec
1041         },
1042         {
1043                 .procname       = "tcp_adv_win_scale",
1044                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1045                 .maxlen         = sizeof(int),
1046                 .mode           = 0644,
1047                 .proc_handler   = proc_dointvec_minmax,
1048                 .extra1         = &tcp_adv_win_scale_min,
1049                 .extra2         = &tcp_adv_win_scale_max,
1050         },
1051         {
1052                 .procname       = "tcp_frto",
1053                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1054                 .maxlen         = sizeof(int),
1055                 .mode           = 0644,
1056                 .proc_handler   = proc_dointvec
1057         },
1058         {
1059                 .procname       = "tcp_no_metrics_save",
1060                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1061                 .maxlen         = sizeof(int),
1062                 .mode           = 0644,
1063                 .proc_handler   = proc_dointvec,
1064         },
1065         {
1066                 .procname       = "tcp_moderate_rcvbuf",
1067                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1068                 .maxlen         = sizeof(int),
1069                 .mode           = 0644,
1070                 .proc_handler   = proc_dointvec,
1071         },
1072         {
1073                 .procname       = "tcp_tso_win_divisor",
1074                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1075                 .maxlen         = sizeof(int),
1076                 .mode           = 0644,
1077                 .proc_handler   = proc_dointvec,
1078         },
1079         {
1080                 .procname       = "tcp_workaround_signed_windows",
1081                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1082                 .maxlen         = sizeof(int),
1083                 .mode           = 0644,
1084                 .proc_handler   = proc_dointvec
1085         },
1086         {
1087                 .procname       = "tcp_limit_output_bytes",
1088                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1089                 .maxlen         = sizeof(int),
1090                 .mode           = 0644,
1091                 .proc_handler   = proc_dointvec
1092         },
1093         {
1094                 .procname       = "tcp_challenge_ack_limit",
1095                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1096                 .maxlen         = sizeof(int),
1097                 .mode           = 0644,
1098                 .proc_handler   = proc_dointvec
1099         },
1100         {
1101                 .procname       = "tcp_min_tso_segs",
1102                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1103                 .maxlen         = sizeof(int),
1104                 .mode           = 0644,
1105                 .proc_handler   = proc_dointvec_minmax,
1106                 .extra1         = &one,
1107                 .extra2         = &gso_max_segs,
1108         },
1109         {
1110                 .procname       = "tcp_min_rtt_wlen",
1111                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1112                 .maxlen         = sizeof(int),
1113                 .mode           = 0644,
1114                 .proc_handler   = proc_dointvec
1115         },
1116         {
1117                 .procname       = "tcp_autocorking",
1118                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1119                 .maxlen         = sizeof(int),
1120                 .mode           = 0644,
1121                 .proc_handler   = proc_dointvec_minmax,
1122                 .extra1         = &zero,
1123                 .extra2         = &one,
1124         },
1125         {
1126                 .procname       = "tcp_invalid_ratelimit",
1127                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1128                 .maxlen         = sizeof(int),
1129                 .mode           = 0644,
1130                 .proc_handler   = proc_dointvec_ms_jiffies,
1131         },
1132         {
1133                 .procname       = "tcp_pacing_ss_ratio",
1134                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1135                 .maxlen         = sizeof(int),
1136                 .mode           = 0644,
1137                 .proc_handler   = proc_dointvec_minmax,
1138                 .extra1         = &zero,
1139                 .extra2         = &thousand,
1140         },
1141         {
1142                 .procname       = "tcp_pacing_ca_ratio",
1143                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1144                 .maxlen         = sizeof(int),
1145                 .mode           = 0644,
1146                 .proc_handler   = proc_dointvec_minmax,
1147                 .extra1         = &zero,
1148                 .extra2         = &thousand,
1149         },
1150         {
1151                 .procname       = "tcp_wmem",
1152                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1153                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1154                 .mode           = 0644,
1155                 .proc_handler   = proc_dointvec_minmax,
1156                 .extra1         = &one,
1157         },
1158         {
1159                 .procname       = "tcp_rmem",
1160                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1161                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1162                 .mode           = 0644,
1163                 .proc_handler   = proc_dointvec_minmax,
1164                 .extra1         = &one,
1165         },
1166         {
1167                 .procname       = "tcp_comp_sack_delay_ns",
1168                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1169                 .maxlen         = sizeof(unsigned long),
1170                 .mode           = 0644,
1171                 .proc_handler   = proc_doulongvec_minmax,
1172         },
1173         {
1174                 .procname       = "tcp_comp_sack_nr",
1175                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1176                 .maxlen         = sizeof(int),
1177                 .mode           = 0644,
1178                 .proc_handler   = proc_dointvec_minmax,
1179                 .extra1         = &zero,
1180                 .extra2         = &comp_sack_nr_max,
1181         },
1182         {
1183                 .procname       = "udp_rmem_min",
1184                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1185                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1186                 .mode           = 0644,
1187                 .proc_handler   = proc_dointvec_minmax,
1188                 .extra1         = &one
1189         },
1190         {
1191                 .procname       = "udp_wmem_min",
1192                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1193                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1194                 .mode           = 0644,
1195                 .proc_handler   = proc_dointvec_minmax,
1196                 .extra1         = &one
1197         },
1198         { }
1199 };
1200
1201 static __net_init int ipv4_sysctl_init_net(struct net *net)
1202 {
1203         struct ctl_table *table;
1204
1205         table = ipv4_net_table;
1206         if (!net_eq(net, &init_net)) {
1207                 int i;
1208
1209                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1210                 if (!table)
1211                         goto err_alloc;
1212
1213                 /* Update the variables to point into the current struct net */
1214                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1215                         table[i].data += (void *)net - (void *)&init_net;
1216         }
1217
1218         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1219         if (!net->ipv4.ipv4_hdr)
1220                 goto err_reg;
1221
1222         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1223         if (!net->ipv4.sysctl_local_reserved_ports)
1224                 goto err_ports;
1225
1226         return 0;
1227
1228 err_ports:
1229         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1230 err_reg:
1231         if (!net_eq(net, &init_net))
1232                 kfree(table);
1233 err_alloc:
1234         return -ENOMEM;
1235 }
1236
1237 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1238 {
1239         struct ctl_table *table;
1240
1241         kfree(net->ipv4.sysctl_local_reserved_ports);
1242         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1243         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1244         kfree(table);
1245 }
1246
1247 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1248         .init = ipv4_sysctl_init_net,
1249         .exit = ipv4_sysctl_exit_net,
1250 };
1251
1252 static __init int sysctl_ipv4_init(void)
1253 {
1254         struct ctl_table_header *hdr;
1255
1256         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1257         if (!hdr)
1258                 return -ENOMEM;
1259
1260         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1261                 unregister_net_sysctl_table(hdr);
1262                 return -ENOMEM;
1263         }
1264
1265         return 0;
1266 }
1267
1268 __initcall(sysctl_ipv4_init);