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 two = 2;
  32 static int four = 4;
  33 static int thousand = 1000;
  34 static int gso_max_segs = GSO_MAX_SEGS;
  35 static int tcp_retr1_max = 255;
  36 static int ip_local_port_range_min[] = { 1, 1 };
  37 static int ip_local_port_range_max[] = { 65535, 65535 };
  38 static int tcp_adv_win_scale_min = -31;
  39 static int tcp_adv_win_scale_max = 31;
  40 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  41 static int tcp_min_snd_mss_max = 65535;
  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 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  52 static int one_day_secs = 24 * 3600;
  53
  54 /* obsolete */
  55 static int sysctl_tcp_low_latency __read_mostly;
  56
  57 /* Update system visible IP port range */
  58 static void set_local_port_range(struct net *net, int range[2])
  59 {
  60         bool same_parity = !((range[0] ^ range[1]) & 1);
  61
  62         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  63         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  64                 net->ipv4.ip_local_ports.warned = true;
  65                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  66         }
  67         net->ipv4.ip_local_ports.range[0] = range[0];
  68         net->ipv4.ip_local_ports.range[1] = range[1];
  69         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  70 }
  71
  72 /* Validate changes from /proc interface. */
  73 static int ipv4_local_port_range(struct ctl_table *table, int write,
  74                                  void __user *buffer,
  75                                  size_t *lenp, loff_t *ppos)
  76 {
  77         struct net *net =
  78                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  79         int ret;
  80         int range[2];
  81         struct ctl_table tmp = {
  82                 .data = &range,
  83                 .maxlen = sizeof(range),
  84                 .mode = table->mode,
  85                 .extra1 = &ip_local_port_range_min,
  86                 .extra2 = &ip_local_port_range_max,
  87         };
  88
  89         inet_get_local_port_range(net, &range[0], &range[1]);
  90
  91         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  92
  93         if (write && ret == 0) {
  94                 /* Ensure that the upper limit is not smaller than the lower,
  95                  * and that the lower does not encroach upon the privileged
  96                  * port limit.
  97                  */
  98                 if ((range[1] < range[0]) ||
  99                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
 100                         ret = -EINVAL;
 101                 else
 102                         set_local_port_range(net, range);
 103         }
 104
 105         return ret;
 106 }
 107
 108 /* Validate changes from /proc interface. */
 109 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 110                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 111 {
 112         struct net *net = container_of(table->data, struct net,
 113             ipv4.sysctl_ip_prot_sock);
 114         int ret;
 115         int pports;
 116         int range[2];
 117         struct ctl_table tmp = {
 118                 .data = &pports,
 119                 .maxlen = sizeof(pports),
 120                 .mode = table->mode,
 121                 .extra1 = &ip_privileged_port_min,
 122                 .extra2 = &ip_privileged_port_max,
 123         };
 124
 125         pports = net->ipv4.sysctl_ip_prot_sock;
 126
 127         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 128
 129         if (write && ret == 0) {
 130                 inet_get_local_port_range(net, &range[0], &range[1]);
 131                 /* Ensure that the local port range doesn't overlap with the
 132                  * privileged port range.
 133                  */
 134                 if (range[0] < pports)
 135                         ret = -EINVAL;
 136                 else
 137                         net->ipv4.sysctl_ip_prot_sock = pports;
 138         }
 139
 140         return ret;
 141 }
 142
 143 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 144 {
 145         kgid_t *data = table->data;
 146         struct net *net =
 147                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 148         unsigned int seq;
 149         do {
 150                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 151
 152                 *low = data[0];
 153                 *high = data[1];
 154         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 155 }
 156
 157 /* Update system visible IP port range */
 158 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 159 {
 160         kgid_t *data = table->data;
 161         struct net *net =
 162                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 163         write_seqlock(&net->ipv4.ping_group_range.lock);
 164         data[0] = low;
 165         data[1] = high;
 166         write_sequnlock(&net->ipv4.ping_group_range.lock);
 167 }
 168
 169 /* Validate changes from /proc interface. */
 170 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 171                                  void __user *buffer,
 172                                  size_t *lenp, loff_t *ppos)
 173 {
 174         struct user_namespace *user_ns = current_user_ns();
 175         int ret;
 176         gid_t urange[2];
 177         kgid_t low, high;
 178         struct ctl_table tmp = {
 179                 .data = &urange,
 180                 .maxlen = sizeof(urange),
 181                 .mode = table->mode,
 182                 .extra1 = &ip_ping_group_range_min,
 183                 .extra2 = &ip_ping_group_range_max,
 184         };
 185
 186         inet_get_ping_group_range_table(table, &low, &high);
 187         urange[0] = from_kgid_munged(user_ns, low);
 188         urange[1] = from_kgid_munged(user_ns, high);
 189         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 190
 191         if (write && ret == 0) {
 192                 low = make_kgid(user_ns, urange[0]);
 193                 high = make_kgid(user_ns, urange[1]);
 194                 if (!gid_valid(low) || !gid_valid(high))
 195                         return -EINVAL;
 196                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 197                         low = make_kgid(&init_user_ns, 1);
 198                         high = make_kgid(&init_user_ns, 0);
 199                 }
 200                 set_ping_group_range(table, low, high);
 201         }
 202
 203         return ret;
 204 }
 205
 206 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 207                                     void __user *buffer,
 208                                     size_t *lenp, loff_t *ppos)
 209 {
 210         struct net *net;
 211         int ret;
 212
 213         net = container_of(table->data, struct net,
 214                            ipv4.sysctl_ip_fwd_update_priority);
 215         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 216         if (write && ret == 0)
 217                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 218                                         net);
 219
 220         return ret;
 221 }
 222
 223 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 224                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 225 {
 226         struct net *net = container_of(ctl->data, struct net,
 227                                        ipv4.tcp_congestion_control);
 228         char val[TCP_CA_NAME_MAX];
 229         struct ctl_table tbl = {
 230                 .data = val,
 231                 .maxlen = TCP_CA_NAME_MAX,
 232         };
 233         int ret;
 234
 235         tcp_get_default_congestion_control(net, val);
 236
 237         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 238         if (write && ret == 0)
 239                 ret = tcp_set_default_congestion_control(net, val);
 240         return ret;
 241 }
 242
 243 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 244                                                  int write,
 245                                                  void __user *buffer, size_t *lenp,
 246                                                  loff_t *ppos)
 247 {
 248         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 249         int ret;
 250
 251         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 252         if (!tbl.data)
 253                 return -ENOMEM;
 254         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 255         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 256         kfree(tbl.data);
 257         return ret;
 258 }
 259
 260 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 261                                            int write,
 262                                            void __user *buffer, size_t *lenp,
 263                                            loff_t *ppos)
 264 {
 265         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 266         int ret;
 267
 268         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 269         if (!tbl.data)
 270                 return -ENOMEM;
 271
 272         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 273         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 274         if (write && ret == 0)
 275                 ret = tcp_set_allowed_congestion_control(tbl.data);
 276         kfree(tbl.data);
 277         return ret;
 278 }
 279
 280 static int sscanf_key(char *buf, __le32 *key)
 281 {
 282         u32 user_key[4];
 283         int i, ret = 0;
 284
 285         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 286                    user_key + 2, user_key + 3) != 4) {
 287                 ret = -EINVAL;
 288         } else {
 289                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 290                         key[i] = cpu_to_le32(user_key[i]);
 291         }
 292         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 293                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 294
 295         return ret;
 296 }
 297
 298 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 299                                  void __user *buffer, size_t *lenp,
 300                                  loff_t *ppos)
 301 {
 302         struct net *net = container_of(table->data, struct net,
 303             ipv4.sysctl_tcp_fastopen);
 304         /* maxlen to print the list of keys in hex (*2), with dashes
 305          * separating doublewords and a comma in between keys.
 306          */
 307         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 308                                             2 * TCP_FASTOPEN_KEY_MAX) +
 309                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 310         struct tcp_fastopen_context *ctx;
 311         u32 user_key[TCP_FASTOPEN_KEY_MAX * 4];
 312         __le32 key[TCP_FASTOPEN_KEY_MAX * 4];
 313         char *backup_data;
 314         int ret, i = 0, off = 0, n_keys = 0;
 315
 316         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 317         if (!tbl.data)
 318                 return -ENOMEM;
 319
 320         rcu_read_lock();
 321         ctx = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 322         if (ctx) {
 323                 n_keys = tcp_fastopen_context_len(ctx);
 324                 memcpy(&key[0], &ctx->key[0], TCP_FASTOPEN_KEY_LENGTH * n_keys);
 325         }
 326         rcu_read_unlock();
 327
 328         if (!n_keys) {
 329                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 330                 n_keys = 1;
 331         }
 332
 333         for (i = 0; i < n_keys * 4; i++)
 334                 user_key[i] = le32_to_cpu(key[i]);
 335
 336         for (i = 0; i < n_keys; i++) {
 337                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 338                                 "%08x-%08x-%08x-%08x",
 339                                 user_key[i * 4],
 340                                 user_key[i * 4 + 1],
 341                                 user_key[i * 4 + 2],
 342                                 user_key[i * 4 + 3]);
 343
 344                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 345                         break;
 346
 347                 if (i + 1 < n_keys)
 348                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 349         }
 350
 351         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 352
 353         if (write && ret == 0) {
 354                 backup_data = strchr(tbl.data, ',');
 355                 if (backup_data) {
 356                         *backup_data = '\0';
 357                         backup_data++;
 358                 }
 359                 if (sscanf_key(tbl.data, key)) {
 360                         ret = -EINVAL;
 361                         goto bad_key;
 362                 }
 363                 if (backup_data) {
 364                         if (sscanf_key(backup_data, key + 4)) {
 365                                 ret = -EINVAL;
 366                                 goto bad_key;
 367                         }
 368                 }
 369                 tcp_fastopen_reset_cipher(net, NULL, key,
 370                                           backup_data ? key + 4 : NULL);
 371         }
 372
 373 bad_key:
 374         kfree(tbl.data);
 375         return ret;
 376 }
 377
 378 static void proc_configure_early_demux(int enabled, int protocol)
 379 {
 380         struct net_protocol *ipprot;
 381 #if IS_ENABLED(CONFIG_IPV6)
 382         struct inet6_protocol *ip6prot;
 383 #endif
 384
 385         rcu_read_lock();
 386
 387         ipprot = rcu_dereference(inet_protos[protocol]);
 388         if (ipprot)
 389                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 390                                                 NULL;
 391
 392 #if IS_ENABLED(CONFIG_IPV6)
 393         ip6prot = rcu_dereference(inet6_protos[protocol]);
 394         if (ip6prot)
 395                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 396                                                  NULL;
 397 #endif
 398         rcu_read_unlock();
 399 }
 400
 401 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 402                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 403 {
 404         int ret = 0;
 405
 406         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 407
 408         if (write && !ret) {
 409                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 410
 411                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 412         }
 413
 414         return ret;
 415 }
 416
 417 static int proc_udp_early_demux(struct ctl_table *table, int write,
 418                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 419 {
 420         int ret = 0;
 421
 422         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 423
 424         if (write && !ret) {
 425                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 426
 427                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 428         }
 429
 430         return ret;
 431 }
 432
 433 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 434                                              int write,
 435                                              void __user *buffer,
 436                                              size_t *lenp, loff_t *ppos)
 437 {
 438         struct net *net = container_of(table->data, struct net,
 439             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 440         int ret;
 441
 442         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 443         if (write && ret == 0)
 444                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 445
 446         return ret;
 447 }
 448
 449 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 450                                   int write,
 451                                   void __user *buffer, size_t *lenp,
 452                                   loff_t *ppos)
 453 {
 454         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 455         int ret;
 456
 457         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 458         if (!tbl.data)
 459                 return -ENOMEM;
 460         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 461         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 462         kfree(tbl.data);
 463
 464         return ret;
 465 }
 466
 467 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 468 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 469                                           void __user *buffer, size_t *lenp,
 470                                           loff_t *ppos)
 471 {
 472         struct net *net = container_of(table->data, struct net,
 473             ipv4.sysctl_fib_multipath_hash_policy);
 474         int ret;
 475
 476         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 477         if (write && ret == 0)
 478                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 479
 480         return ret;
 481 }
 482 #endif
 483
 484 static struct ctl_table ipv4_table[] = {
 485         {
 486                 .procname       = "tcp_max_orphans",
 487                 .data           = &sysctl_tcp_max_orphans,
 488                 .maxlen         = sizeof(int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec
 491         },
 492         {
 493                 .procname       = "inet_peer_threshold",
 494                 .data           = &inet_peer_threshold,
 495                 .maxlen         = sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = proc_dointvec
 498         },
 499         {
 500                 .procname       = "inet_peer_minttl",
 501                 .data           = &inet_peer_minttl,
 502                 .maxlen         = sizeof(int),
 503                 .mode           = 0644,
 504                 .proc_handler   = proc_dointvec_jiffies,
 505         },
 506         {
 507                 .procname       = "inet_peer_maxttl",
 508                 .data           = &inet_peer_maxttl,
 509                 .maxlen         = sizeof(int),
 510                 .mode           = 0644,
 511                 .proc_handler   = proc_dointvec_jiffies,
 512         },
 513         {
 514                 .procname       = "tcp_mem",
 515                 .maxlen         = sizeof(sysctl_tcp_mem),
 516                 .data           = &sysctl_tcp_mem,
 517                 .mode           = 0644,
 518                 .proc_handler   = proc_doulongvec_minmax,
 519         },
 520         {
 521                 .procname       = "tcp_low_latency",
 522                 .data           = &sysctl_tcp_low_latency,
 523                 .maxlen         = sizeof(int),
 524                 .mode           = 0644,
 525                 .proc_handler   = proc_dointvec
 526         },
 527 #ifdef CONFIG_NETLABEL
 528         {
 529                 .procname       = "cipso_cache_enable",
 530                 .data           = &cipso_v4_cache_enabled,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = proc_dointvec,
 534         },
 535         {
 536                 .procname       = "cipso_cache_bucket_size",
 537                 .data           = &cipso_v4_cache_bucketsize,
 538                 .maxlen         = sizeof(int),
 539                 .mode           = 0644,
 540                 .proc_handler   = proc_dointvec,
 541         },
 542         {
 543                 .procname       = "cipso_rbm_optfmt",
 544                 .data           = &cipso_v4_rbm_optfmt,
 545                 .maxlen         = sizeof(int),
 546                 .mode           = 0644,
 547                 .proc_handler   = proc_dointvec,
 548         },
 549         {
 550                 .procname       = "cipso_rbm_strictvalid",
 551                 .data           = &cipso_v4_rbm_strictvalid,
 552                 .maxlen         = sizeof(int),
 553                 .mode           = 0644,
 554                 .proc_handler   = proc_dointvec,
 555         },
 556 #endif /* CONFIG_NETLABEL */
 557         {
 558                 .procname       = "tcp_available_congestion_control",
 559                 .maxlen         = TCP_CA_BUF_MAX,
 560                 .mode           = 0444,
 561                 .proc_handler   = proc_tcp_available_congestion_control,
 562         },
 563         {
 564                 .procname       = "tcp_allowed_congestion_control",
 565                 .maxlen         = TCP_CA_BUF_MAX,
 566                 .mode           = 0644,
 567                 .proc_handler   = proc_allowed_congestion_control,
 568         },
 569         {
 570                 .procname       = "tcp_available_ulp",
 571                 .maxlen         = TCP_ULP_BUF_MAX,
 572                 .mode           = 0444,
 573                 .proc_handler   = proc_tcp_available_ulp,
 574         },
 575         {
 576                 .procname       = "icmp_msgs_per_sec",
 577                 .data           = &sysctl_icmp_msgs_per_sec,
 578                 .maxlen         = sizeof(int),
 579                 .mode           = 0644,
 580                 .proc_handler   = proc_dointvec_minmax,
 581                 .extra1         = SYSCTL_ZERO,
 582         },
 583         {
 584                 .procname       = "icmp_msgs_burst",
 585                 .data           = &sysctl_icmp_msgs_burst,
 586                 .maxlen         = sizeof(int),
 587                 .mode           = 0644,
 588                 .proc_handler   = proc_dointvec_minmax,
 589                 .extra1         = SYSCTL_ZERO,
 590         },
 591         {
 592                 .procname       = "udp_mem",
 593                 .data           = &sysctl_udp_mem,
 594                 .maxlen         = sizeof(sysctl_udp_mem),
 595                 .mode           = 0644,
 596                 .proc_handler   = proc_doulongvec_minmax,
 597         },
 598         {
 599                 .procname       = "fib_sync_mem",
 600                 .data           = &sysctl_fib_sync_mem,
 601                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 602                 .mode           = 0644,
 603                 .proc_handler   = proc_douintvec_minmax,
 604                 .extra1         = &sysctl_fib_sync_mem_min,
 605                 .extra2         = &sysctl_fib_sync_mem_max,
 606         },
 607         {
 608                 .procname       = "tcp_rx_skb_cache",
 609                 .data           = &tcp_rx_skb_cache_key.key,
 610                 .mode           = 0644,
 611                 .proc_handler   = proc_do_static_key,
 612         },
 613         {
 614                 .procname       = "tcp_tx_skb_cache",
 615                 .data           = &tcp_tx_skb_cache_key.key,
 616                 .mode           = 0644,
 617                 .proc_handler   = proc_do_static_key,
 618         },
 619         { }
 620 };
 621
 622 static struct ctl_table ipv4_net_table[] = {
 623         {
 624                 .procname       = "icmp_echo_ignore_all",
 625                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 626                 .maxlen         = sizeof(int),
 627                 .mode           = 0644,
 628                 .proc_handler   = proc_dointvec
 629         },
 630         {
 631                 .procname       = "icmp_echo_ignore_broadcasts",
 632                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = proc_dointvec
 636         },
 637         {
 638                 .procname       = "icmp_ignore_bogus_error_responses",
 639                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = proc_dointvec
 643         },
 644         {
 645                 .procname       = "icmp_errors_use_inbound_ifaddr",
 646                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 647                 .maxlen         = sizeof(int),
 648                 .mode           = 0644,
 649                 .proc_handler   = proc_dointvec
 650         },
 651         {
 652                 .procname       = "icmp_ratelimit",
 653                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 654                 .maxlen         = sizeof(int),
 655                 .mode           = 0644,
 656                 .proc_handler   = proc_dointvec_ms_jiffies,
 657         },
 658         {
 659                 .procname       = "icmp_ratemask",
 660                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 661                 .maxlen         = sizeof(int),
 662                 .mode           = 0644,
 663                 .proc_handler   = proc_dointvec
 664         },
 665         {
 666                 .procname       = "ping_group_range",
 667                 .data           = &init_net.ipv4.ping_group_range.range,
 668                 .maxlen         = sizeof(gid_t)*2,
 669                 .mode           = 0644,
 670                 .proc_handler   = ipv4_ping_group_range,
 671         },
 672 #ifdef CONFIG_NET_L3_MASTER_DEV
 673         {
 674                 .procname       = "raw_l3mdev_accept",
 675                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 676                 .maxlen         = sizeof(int),
 677                 .mode           = 0644,
 678                 .proc_handler   = proc_dointvec_minmax,
 679                 .extra1         = SYSCTL_ZERO,
 680                 .extra2         = SYSCTL_ONE,
 681         },
 682 #endif
 683         {
 684                 .procname       = "tcp_ecn",
 685                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 686                 .maxlen         = sizeof(int),
 687                 .mode           = 0644,
 688                 .proc_handler   = proc_dointvec
 689         },
 690         {
 691                 .procname       = "tcp_ecn_fallback",
 692                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 693                 .maxlen         = sizeof(int),
 694                 .mode           = 0644,
 695                 .proc_handler   = proc_dointvec
 696         },
 697         {
 698                 .procname       = "ip_dynaddr",
 699                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 700                 .maxlen         = sizeof(int),
 701                 .mode           = 0644,
 702                 .proc_handler   = proc_dointvec
 703         },
 704         {
 705                 .procname       = "ip_early_demux",
 706                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 707                 .maxlen         = sizeof(int),
 708                 .mode           = 0644,
 709                 .proc_handler   = proc_dointvec
 710         },
 711         {
 712                 .procname       = "udp_early_demux",
 713                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 714                 .maxlen         = sizeof(int),
 715                 .mode           = 0644,
 716                 .proc_handler   = proc_udp_early_demux
 717         },
 718         {
 719                 .procname       = "tcp_early_demux",
 720                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 721                 .maxlen         = sizeof(int),
 722                 .mode           = 0644,
 723                 .proc_handler   = proc_tcp_early_demux
 724         },
 725         {
 726                 .procname       = "ip_default_ttl",
 727                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 728                 .maxlen         = sizeof(int),
 729                 .mode           = 0644,
 730                 .proc_handler   = proc_dointvec_minmax,
 731                 .extra1         = &ip_ttl_min,
 732                 .extra2         = &ip_ttl_max,
 733         },
 734         {
 735                 .procname       = "ip_local_port_range",
 736                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 737                 .data           = &init_net.ipv4.ip_local_ports.range,
 738                 .mode           = 0644,
 739                 .proc_handler   = ipv4_local_port_range,
 740         },
 741         {
 742                 .procname       = "ip_local_reserved_ports",
 743                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 744                 .maxlen         = 65536,
 745                 .mode           = 0644,
 746                 .proc_handler   = proc_do_large_bitmap,
 747         },
 748         {
 749                 .procname       = "ip_no_pmtu_disc",
 750                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 751                 .maxlen         = sizeof(int),
 752                 .mode           = 0644,
 753                 .proc_handler   = proc_dointvec
 754         },
 755         {
 756                 .procname       = "ip_forward_use_pmtu",
 757                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 758                 .maxlen         = sizeof(int),
 759                 .mode           = 0644,
 760                 .proc_handler   = proc_dointvec,
 761         },
 762         {
 763                 .procname       = "ip_forward_update_priority",
 764                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 765                 .maxlen         = sizeof(int),
 766                 .mode           = 0644,
 767                 .proc_handler   = ipv4_fwd_update_priority,
 768                 .extra1         = SYSCTL_ZERO,
 769                 .extra2         = SYSCTL_ONE,
 770         },
 771         {
 772                 .procname       = "ip_nonlocal_bind",
 773                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 774                 .maxlen         = sizeof(int),
 775                 .mode           = 0644,
 776                 .proc_handler   = proc_dointvec
 777         },
 778         {
 779                 .procname       = "fwmark_reflect",
 780                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 781                 .maxlen         = sizeof(int),
 782                 .mode           = 0644,
 783                 .proc_handler   = proc_dointvec,
 784         },
 785         {
 786                 .procname       = "tcp_fwmark_accept",
 787                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 788                 .maxlen         = sizeof(int),
 789                 .mode           = 0644,
 790                 .proc_handler   = proc_dointvec,
 791         },
 792 #ifdef CONFIG_NET_L3_MASTER_DEV
 793         {
 794                 .procname       = "tcp_l3mdev_accept",
 795                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = proc_dointvec_minmax,
 799                 .extra1         = SYSCTL_ZERO,
 800                 .extra2         = SYSCTL_ONE,
 801         },
 802 #endif
 803         {
 804                 .procname       = "tcp_mtu_probing",
 805                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 806                 .maxlen         = sizeof(int),
 807                 .mode           = 0644,
 808                 .proc_handler   = proc_dointvec,
 809         },
 810         {
 811                 .procname       = "tcp_base_mss",
 812                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 813                 .maxlen         = sizeof(int),
 814                 .mode           = 0644,
 815                 .proc_handler   = proc_dointvec,
 816         },
 817         {
 818                 .procname       = "tcp_min_snd_mss",
 819                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 820                 .maxlen         = sizeof(int),
 821                 .mode           = 0644,
 822                 .proc_handler   = proc_dointvec_minmax,
 823                 .extra1         = &tcp_min_snd_mss_min,
 824                 .extra2         = &tcp_min_snd_mss_max,
 825         },
 826         {
 827                 .procname       = "tcp_mtu_probe_floor",
 828                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 829                 .maxlen         = sizeof(int),
 830                 .mode           = 0644,
 831                 .proc_handler   = proc_dointvec_minmax,
 832                 .extra1         = &tcp_min_snd_mss_min,
 833                 .extra2         = &tcp_min_snd_mss_max,
 834         },
 835         {
 836                 .procname       = "tcp_probe_threshold",
 837                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 838                 .maxlen         = sizeof(int),
 839                 .mode           = 0644,
 840                 .proc_handler   = proc_dointvec,
 841         },
 842         {
 843                 .procname       = "tcp_probe_interval",
 844                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 845                 .maxlen         = sizeof(u32),
 846                 .mode           = 0644,
 847                 .proc_handler   = proc_douintvec_minmax,
 848                 .extra2         = &u32_max_div_HZ,
 849         },
 850         {
 851                 .procname       = "igmp_link_local_mcast_reports",
 852                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 853                 .maxlen         = sizeof(int),
 854                 .mode           = 0644,
 855                 .proc_handler   = proc_dointvec
 856         },
 857         {
 858                 .procname       = "igmp_max_memberships",
 859                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 860                 .maxlen         = sizeof(int),
 861                 .mode           = 0644,
 862                 .proc_handler   = proc_dointvec
 863         },
 864         {
 865                 .procname       = "igmp_max_msf",
 866                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 867                 .maxlen         = sizeof(int),
 868                 .mode           = 0644,
 869                 .proc_handler   = proc_dointvec
 870         },
 871 #ifdef CONFIG_IP_MULTICAST
 872         {
 873                 .procname       = "igmp_qrv",
 874                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 875                 .maxlen         = sizeof(int),
 876                 .mode           = 0644,
 877                 .proc_handler   = proc_dointvec_minmax,
 878                 .extra1         = SYSCTL_ONE
 879         },
 880 #endif
 881         {
 882                 .procname       = "tcp_congestion_control",
 883                 .data           = &init_net.ipv4.tcp_congestion_control,
 884                 .mode           = 0644,
 885                 .maxlen         = TCP_CA_NAME_MAX,
 886                 .proc_handler   = proc_tcp_congestion_control,
 887         },
 888         {
 889                 .procname       = "tcp_keepalive_time",
 890                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 891                 .maxlen         = sizeof(int),
 892                 .mode           = 0644,
 893                 .proc_handler   = proc_dointvec_jiffies,
 894         },
 895         {
 896                 .procname       = "tcp_keepalive_probes",
 897                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 898                 .maxlen         = sizeof(int),
 899                 .mode           = 0644,
 900                 .proc_handler   = proc_dointvec
 901         },
 902         {
 903                 .procname       = "tcp_keepalive_intvl",
 904                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 905                 .maxlen         = sizeof(int),
 906                 .mode           = 0644,
 907                 .proc_handler   = proc_dointvec_jiffies,
 908         },
 909         {
 910                 .procname       = "tcp_syn_retries",
 911                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 912                 .maxlen         = sizeof(int),
 913                 .mode           = 0644,
 914                 .proc_handler   = proc_dointvec_minmax,
 915                 .extra1         = &tcp_syn_retries_min,
 916                 .extra2         = &tcp_syn_retries_max
 917         },
 918         {
 919                 .procname       = "tcp_synack_retries",
 920                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 921                 .maxlen         = sizeof(int),
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_dointvec
 924         },
 925 #ifdef CONFIG_SYN_COOKIES
 926         {
 927                 .procname       = "tcp_syncookies",
 928                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 929                 .maxlen         = sizeof(int),
 930                 .mode           = 0644,
 931                 .proc_handler   = proc_dointvec
 932         },
 933 #endif
 934         {
 935                 .procname       = "tcp_reordering",
 936                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 937                 .maxlen         = sizeof(int),
 938                 .mode           = 0644,
 939                 .proc_handler   = proc_dointvec
 940         },
 941         {
 942                 .procname       = "tcp_retries1",
 943                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 944                 .maxlen         = sizeof(int),
 945                 .mode           = 0644,
 946                 .proc_handler   = proc_dointvec_minmax,
 947                 .extra2         = &tcp_retr1_max
 948         },
 949         {
 950                 .procname       = "tcp_retries2",
 951                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 952                 .maxlen         = sizeof(int),
 953                 .mode           = 0644,
 954                 .proc_handler   = proc_dointvec
 955         },
 956         {
 957                 .procname       = "tcp_orphan_retries",
 958                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 959                 .maxlen         = sizeof(int),
 960                 .mode           = 0644,
 961                 .proc_handler   = proc_dointvec
 962         },
 963         {
 964                 .procname       = "tcp_fin_timeout",
 965                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 966                 .maxlen         = sizeof(int),
 967                 .mode           = 0644,
 968                 .proc_handler   = proc_dointvec_jiffies,
 969         },
 970         {
 971                 .procname       = "tcp_notsent_lowat",
 972                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 973                 .maxlen         = sizeof(unsigned int),
 974                 .mode           = 0644,
 975                 .proc_handler   = proc_douintvec,
 976         },
 977         {
 978                 .procname       = "tcp_tw_reuse",
 979                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 980                 .maxlen         = sizeof(int),
 981                 .mode           = 0644,
 982                 .proc_handler   = proc_dointvec_minmax,
 983                 .extra1         = SYSCTL_ZERO,
 984                 .extra2         = &two,
 985         },
 986         {
 987                 .procname       = "tcp_max_tw_buckets",
 988                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 989                 .maxlen         = sizeof(int),
 990                 .mode           = 0644,
 991                 .proc_handler   = proc_dointvec
 992         },
 993         {
 994                 .procname       = "tcp_max_syn_backlog",
 995                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 996                 .maxlen         = sizeof(int),
 997                 .mode           = 0644,
 998                 .proc_handler   = proc_dointvec
 999         },
1000         {
1001                 .procname       = "tcp_fastopen",
1002                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1003                 .maxlen         = sizeof(int),
1004                 .mode           = 0644,
1005                 .proc_handler   = proc_dointvec,
1006         },
1007         {
1008                 .procname       = "tcp_fastopen_key",
1009                 .mode           = 0600,
1010                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1011                 /* maxlen to print the list of keys in hex (*2), with dashes
1012                  * separating doublewords and a comma in between keys.
1013                  */
1014                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1015                                    2 * TCP_FASTOPEN_KEY_MAX) +
1016                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1017                 .proc_handler   = proc_tcp_fastopen_key,
1018         },
1019         {
1020                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1021                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1022                 .maxlen         = sizeof(int),
1023                 .mode           = 0644,
1024                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1025                 .extra1         = SYSCTL_ZERO,
1026         },
1027 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1028         {
1029                 .procname       = "fib_multipath_use_neigh",
1030                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1031                 .maxlen         = sizeof(int),
1032                 .mode           = 0644,
1033                 .proc_handler   = proc_dointvec_minmax,
1034                 .extra1         = SYSCTL_ZERO,
1035                 .extra2         = SYSCTL_ONE,
1036         },
1037         {
1038                 .procname       = "fib_multipath_hash_policy",
1039                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1040                 .maxlen         = sizeof(int),
1041                 .mode           = 0644,
1042                 .proc_handler   = proc_fib_multipath_hash_policy,
1043                 .extra1         = SYSCTL_ZERO,
1044                 .extra2         = &two,
1045         },
1046 #endif
1047         {
1048                 .procname       = "ip_unprivileged_port_start",
1049                 .maxlen         = sizeof(int),
1050                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1051                 .mode           = 0644,
1052                 .proc_handler   = ipv4_privileged_ports,
1053         },
1054 #ifdef CONFIG_NET_L3_MASTER_DEV
1055         {
1056                 .procname       = "udp_l3mdev_accept",
1057                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1058                 .maxlen         = sizeof(int),
1059                 .mode           = 0644,
1060                 .proc_handler   = proc_dointvec_minmax,
1061                 .extra1         = SYSCTL_ZERO,
1062                 .extra2         = SYSCTL_ONE,
1063         },
1064 #endif
1065         {
1066                 .procname       = "tcp_sack",
1067                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1068                 .maxlen         = sizeof(int),
1069                 .mode           = 0644,
1070                 .proc_handler   = proc_dointvec
1071         },
1072         {
1073                 .procname       = "tcp_window_scaling",
1074                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1075                 .maxlen         = sizeof(int),
1076                 .mode           = 0644,
1077                 .proc_handler   = proc_dointvec
1078         },
1079         {
1080                 .procname       = "tcp_timestamps",
1081                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1082                 .maxlen         = sizeof(int),
1083                 .mode           = 0644,
1084                 .proc_handler   = proc_dointvec
1085         },
1086         {
1087                 .procname       = "tcp_early_retrans",
1088                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1089                 .maxlen         = sizeof(int),
1090                 .mode           = 0644,
1091                 .proc_handler   = proc_dointvec_minmax,
1092                 .extra1         = SYSCTL_ZERO,
1093                 .extra2         = &four,
1094         },
1095         {
1096                 .procname       = "tcp_recovery",
1097                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1098                 .maxlen         = sizeof(int),
1099                 .mode           = 0644,
1100                 .proc_handler   = proc_dointvec,
1101         },
1102         {
1103                 .procname       = "tcp_thin_linear_timeouts",
1104                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1105                 .maxlen         = sizeof(int),
1106                 .mode           = 0644,
1107                 .proc_handler   = proc_dointvec
1108         },
1109         {
1110                 .procname       = "tcp_slow_start_after_idle",
1111                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1112                 .maxlen         = sizeof(int),
1113                 .mode           = 0644,
1114                 .proc_handler   = proc_dointvec
1115         },
1116         {
1117                 .procname       = "tcp_retrans_collapse",
1118                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1119                 .maxlen         = sizeof(int),
1120                 .mode           = 0644,
1121                 .proc_handler   = proc_dointvec
1122         },
1123         {
1124                 .procname       = "tcp_stdurg",
1125                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1126                 .maxlen         = sizeof(int),
1127                 .mode           = 0644,
1128                 .proc_handler   = proc_dointvec
1129         },
1130         {
1131                 .procname       = "tcp_rfc1337",
1132                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1133                 .maxlen         = sizeof(int),
1134                 .mode           = 0644,
1135                 .proc_handler   = proc_dointvec
1136         },
1137         {
1138                 .procname       = "tcp_abort_on_overflow",
1139                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1140                 .maxlen         = sizeof(int),
1141                 .mode           = 0644,
1142                 .proc_handler   = proc_dointvec
1143         },
1144         {
1145                 .procname       = "tcp_fack",
1146                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1147                 .maxlen         = sizeof(int),
1148                 .mode           = 0644,
1149                 .proc_handler   = proc_dointvec
1150         },
1151         {
1152                 .procname       = "tcp_max_reordering",
1153                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1154                 .maxlen         = sizeof(int),
1155                 .mode           = 0644,
1156                 .proc_handler   = proc_dointvec
1157         },
1158         {
1159                 .procname       = "tcp_dsack",
1160                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1161                 .maxlen         = sizeof(int),
1162                 .mode           = 0644,
1163                 .proc_handler   = proc_dointvec
1164         },
1165         {
1166                 .procname       = "tcp_app_win",
1167                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1168                 .maxlen         = sizeof(int),
1169                 .mode           = 0644,
1170                 .proc_handler   = proc_dointvec
1171         },
1172         {
1173                 .procname       = "tcp_adv_win_scale",
1174                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1175                 .maxlen         = sizeof(int),
1176                 .mode           = 0644,
1177                 .proc_handler   = proc_dointvec_minmax,
1178                 .extra1         = &tcp_adv_win_scale_min,
1179                 .extra2         = &tcp_adv_win_scale_max,
1180         },
1181         {
1182                 .procname       = "tcp_frto",
1183                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1184                 .maxlen         = sizeof(int),
1185                 .mode           = 0644,
1186                 .proc_handler   = proc_dointvec
1187         },
1188         {
1189                 .procname       = "tcp_no_metrics_save",
1190                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1191                 .maxlen         = sizeof(int),
1192                 .mode           = 0644,
1193                 .proc_handler   = proc_dointvec,
1194         },
1195         {
1196                 .procname       = "tcp_no_ssthresh_metrics_save",
1197                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1198                 .maxlen         = sizeof(int),
1199                 .mode           = 0644,
1200                 .proc_handler   = proc_dointvec_minmax,
1201                 .extra1         = SYSCTL_ZERO,
1202                 .extra2         = SYSCTL_ONE,
1203         },
1204         {
1205                 .procname       = "tcp_moderate_rcvbuf",
1206                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1207                 .maxlen         = sizeof(int),
1208                 .mode           = 0644,
1209                 .proc_handler   = proc_dointvec,
1210         },
1211         {
1212                 .procname       = "tcp_tso_win_divisor",
1213                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1214                 .maxlen         = sizeof(int),
1215                 .mode           = 0644,
1216                 .proc_handler   = proc_dointvec,
1217         },
1218         {
1219                 .procname       = "tcp_workaround_signed_windows",
1220                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1221                 .maxlen         = sizeof(int),
1222                 .mode           = 0644,
1223                 .proc_handler   = proc_dointvec
1224         },
1225         {
1226                 .procname       = "tcp_limit_output_bytes",
1227                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1228                 .maxlen         = sizeof(int),
1229                 .mode           = 0644,
1230                 .proc_handler   = proc_dointvec
1231         },
1232         {
1233                 .procname       = "tcp_challenge_ack_limit",
1234                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1235                 .maxlen         = sizeof(int),
1236                 .mode           = 0644,
1237                 .proc_handler   = proc_dointvec
1238         },
1239         {
1240                 .procname       = "tcp_min_tso_segs",
1241                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1242                 .maxlen         = sizeof(int),
1243                 .mode           = 0644,
1244                 .proc_handler   = proc_dointvec_minmax,
1245                 .extra1         = SYSCTL_ONE,
1246                 .extra2         = &gso_max_segs,
1247         },
1248         {
1249                 .procname       = "tcp_min_rtt_wlen",
1250                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1251                 .maxlen         = sizeof(int),
1252                 .mode           = 0644,
1253                 .proc_handler   = proc_dointvec_minmax,
1254                 .extra1         = SYSCTL_ZERO,
1255                 .extra2         = &one_day_secs
1256         },
1257         {
1258                 .procname       = "tcp_autocorking",
1259                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1260                 .maxlen         = sizeof(int),
1261                 .mode           = 0644,
1262                 .proc_handler   = proc_dointvec_minmax,
1263                 .extra1         = SYSCTL_ZERO,
1264                 .extra2         = SYSCTL_ONE,
1265         },
1266         {
1267                 .procname       = "tcp_invalid_ratelimit",
1268                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1269                 .maxlen         = sizeof(int),
1270                 .mode           = 0644,
1271                 .proc_handler   = proc_dointvec_ms_jiffies,
1272         },
1273         {
1274                 .procname       = "tcp_pacing_ss_ratio",
1275                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1276                 .maxlen         = sizeof(int),
1277                 .mode           = 0644,
1278                 .proc_handler   = proc_dointvec_minmax,
1279                 .extra1         = SYSCTL_ZERO,
1280                 .extra2         = &thousand,
1281         },
1282         {
1283                 .procname       = "tcp_pacing_ca_ratio",
1284                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1285                 .maxlen         = sizeof(int),
1286                 .mode           = 0644,
1287                 .proc_handler   = proc_dointvec_minmax,
1288                 .extra1         = SYSCTL_ZERO,
1289                 .extra2         = &thousand,
1290         },
1291         {
1292                 .procname       = "tcp_wmem",
1293                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1294                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1295                 .mode           = 0644,
1296                 .proc_handler   = proc_dointvec_minmax,
1297                 .extra1         = SYSCTL_ONE,
1298         },
1299         {
1300                 .procname       = "tcp_rmem",
1301                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1302                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1303                 .mode           = 0644,
1304                 .proc_handler   = proc_dointvec_minmax,
1305                 .extra1         = SYSCTL_ONE,
1306         },
1307         {
1308                 .procname       = "tcp_comp_sack_delay_ns",
1309                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1310                 .maxlen         = sizeof(unsigned long),
1311                 .mode           = 0644,
1312                 .proc_handler   = proc_doulongvec_minmax,
1313         },
1314         {
1315                 .procname       = "tcp_comp_sack_nr",
1316                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1317                 .maxlen         = sizeof(int),
1318                 .mode           = 0644,
1319                 .proc_handler   = proc_dointvec_minmax,
1320                 .extra1         = SYSCTL_ZERO,
1321                 .extra2         = &comp_sack_nr_max,
1322         },
1323         {
1324                 .procname       = "udp_rmem_min",
1325                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1326                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1327                 .mode           = 0644,
1328                 .proc_handler   = proc_dointvec_minmax,
1329                 .extra1         = SYSCTL_ONE
1330         },
1331         {
1332                 .procname       = "udp_wmem_min",
1333                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1334                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1335                 .mode           = 0644,
1336                 .proc_handler   = proc_dointvec_minmax,
1337                 .extra1         = SYSCTL_ONE
1338         },
1339         { }
1340 };
1341
1342 static __net_init int ipv4_sysctl_init_net(struct net *net)
1343 {
1344         struct ctl_table *table;
1345
1346         table = ipv4_net_table;
1347         if (!net_eq(net, &init_net)) {
1348                 int i;
1349
1350                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1351                 if (!table)
1352                         goto err_alloc;
1353
1354                 /* Update the variables to point into the current struct net */
1355                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1356                         table[i].data += (void *)net - (void *)&init_net;
1357         }
1358
1359         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1360         if (!net->ipv4.ipv4_hdr)
1361                 goto err_reg;
1362
1363         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1364         if (!net->ipv4.sysctl_local_reserved_ports)
1365                 goto err_ports;
1366
1367         return 0;
1368
1369 err_ports:
1370         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1371 err_reg:
1372         if (!net_eq(net, &init_net))
1373                 kfree(table);
1374 err_alloc:
1375         return -ENOMEM;
1376 }
1377
1378 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1379 {
1380         struct ctl_table *table;
1381
1382         kfree(net->ipv4.sysctl_local_reserved_ports);
1383         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1384         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1385         kfree(table);
1386 }
1387
1388 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1389         .init = ipv4_sysctl_init_net,
1390         .exit = ipv4_sysctl_exit_net,
1391 };
1392
1393 static __init int sysctl_ipv4_init(void)
1394 {
1395         struct ctl_table_header *hdr;
1396
1397         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1398         if (!hdr)
1399                 return -ENOMEM;
1400
1401         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1402                 unregister_net_sysctl_table(hdr);
1403                 return -ENOMEM;
1404         }
1405
1406         return 0;
1407 }
1408
1409 __initcall(sysctl_ipv4_init);