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 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 proc_tcp_fastopen_key(struct ctl_table *table, int write,
 281                                  void __user *buffer, size_t *lenp,
 282                                  loff_t *ppos)
 283 {
 284         struct net *net = container_of(table->data, struct net,
 285             ipv4.sysctl_tcp_fastopen);
 286         struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
 287         struct tcp_fastopen_context *ctxt;
 288         u32  user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
 289         __le32 key[4];
 290         int ret, i;
 291
 292         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 293         if (!tbl.data)
 294                 return -ENOMEM;
 295
 296         rcu_read_lock();
 297         ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 298         if (ctxt)
 299                 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
 300         else
 301                 memset(key, 0, sizeof(key));
 302         rcu_read_unlock();
 303
 304         for (i = 0; i < ARRAY_SIZE(key); i++)
 305                 user_key[i] = le32_to_cpu(key[i]);
 306
 307         snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
 308                 user_key[0], user_key[1], user_key[2], user_key[3]);
 309         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 310
 311         if (write && ret == 0) {
 312                 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
 313                            user_key + 2, user_key + 3) != 4) {
 314                         ret = -EINVAL;
 315                         goto bad_key;
 316                 }
 317
 318                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 319                         key[i] = cpu_to_le32(user_key[i]);
 320
 321                 tcp_fastopen_reset_cipher(net, NULL, key,
 322                                           TCP_FASTOPEN_KEY_LENGTH);
 323         }
 324
 325 bad_key:
 326         pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 327                 user_key[0], user_key[1], user_key[2], user_key[3],
 328                (char *)tbl.data, ret);
 329         kfree(tbl.data);
 330         return ret;
 331 }
 332
 333 static void proc_configure_early_demux(int enabled, int protocol)
 334 {
 335         struct net_protocol *ipprot;
 336 #if IS_ENABLED(CONFIG_IPV6)
 337         struct inet6_protocol *ip6prot;
 338 #endif
 339
 340         rcu_read_lock();
 341
 342         ipprot = rcu_dereference(inet_protos[protocol]);
 343         if (ipprot)
 344                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 345                                                 NULL;
 346
 347 #if IS_ENABLED(CONFIG_IPV6)
 348         ip6prot = rcu_dereference(inet6_protos[protocol]);
 349         if (ip6prot)
 350                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 351                                                  NULL;
 352 #endif
 353         rcu_read_unlock();
 354 }
 355
 356 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 357                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 358 {
 359         int ret = 0;
 360
 361         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 362
 363         if (write && !ret) {
 364                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 365
 366                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 367         }
 368
 369         return ret;
 370 }
 371
 372 static int proc_udp_early_demux(struct ctl_table *table, int write,
 373                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 374 {
 375         int ret = 0;
 376
 377         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 378
 379         if (write && !ret) {
 380                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 381
 382                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 383         }
 384
 385         return ret;
 386 }
 387
 388 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 389                                              int write,
 390                                              void __user *buffer,
 391                                              size_t *lenp, loff_t *ppos)
 392 {
 393         struct net *net = container_of(table->data, struct net,
 394             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 395         int ret;
 396
 397         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 398         if (write && ret == 0)
 399                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 400
 401         return ret;
 402 }
 403
 404 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 405                                   int write,
 406                                   void __user *buffer, size_t *lenp,
 407                                   loff_t *ppos)
 408 {
 409         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 410         int ret;
 411
 412         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 413         if (!tbl.data)
 414                 return -ENOMEM;
 415         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 416         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 417         kfree(tbl.data);
 418
 419         return ret;
 420 }
 421
 422 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 423 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 424                                           void __user *buffer, size_t *lenp,
 425                                           loff_t *ppos)
 426 {
 427         struct net *net = container_of(table->data, struct net,
 428             ipv4.sysctl_fib_multipath_hash_policy);
 429         int ret;
 430
 431         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 432         if (write && ret == 0)
 433                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 434
 435         return ret;
 436 }
 437 #endif
 438
 439 static struct ctl_table ipv4_table[] = {
 440         {
 441                 .procname       = "tcp_max_orphans",
 442                 .data           = &sysctl_tcp_max_orphans,
 443                 .maxlen         = sizeof(int),
 444                 .mode           = 0644,
 445                 .proc_handler   = proc_dointvec
 446         },
 447         {
 448                 .procname       = "inet_peer_threshold",
 449                 .data           = &inet_peer_threshold,
 450                 .maxlen         = sizeof(int),
 451                 .mode           = 0644,
 452                 .proc_handler   = proc_dointvec
 453         },
 454         {
 455                 .procname       = "inet_peer_minttl",
 456                 .data           = &inet_peer_minttl,
 457                 .maxlen         = sizeof(int),
 458                 .mode           = 0644,
 459                 .proc_handler   = proc_dointvec_jiffies,
 460         },
 461         {
 462                 .procname       = "inet_peer_maxttl",
 463                 .data           = &inet_peer_maxttl,
 464                 .maxlen         = sizeof(int),
 465                 .mode           = 0644,
 466                 .proc_handler   = proc_dointvec_jiffies,
 467         },
 468         {
 469                 .procname       = "tcp_mem",
 470                 .maxlen         = sizeof(sysctl_tcp_mem),
 471                 .data           = &sysctl_tcp_mem,
 472                 .mode           = 0644,
 473                 .proc_handler   = proc_doulongvec_minmax,
 474         },
 475         {
 476                 .procname       = "tcp_low_latency",
 477                 .data           = &sysctl_tcp_low_latency,
 478                 .maxlen         = sizeof(int),
 479                 .mode           = 0644,
 480                 .proc_handler   = proc_dointvec
 481         },
 482 #ifdef CONFIG_NETLABEL
 483         {
 484                 .procname       = "cipso_cache_enable",
 485                 .data           = &cipso_v4_cache_enabled,
 486                 .maxlen         = sizeof(int),
 487                 .mode           = 0644,
 488                 .proc_handler   = proc_dointvec,
 489         },
 490         {
 491                 .procname       = "cipso_cache_bucket_size",
 492                 .data           = &cipso_v4_cache_bucketsize,
 493                 .maxlen         = sizeof(int),
 494                 .mode           = 0644,
 495                 .proc_handler   = proc_dointvec,
 496         },
 497         {
 498                 .procname       = "cipso_rbm_optfmt",
 499                 .data           = &cipso_v4_rbm_optfmt,
 500                 .maxlen         = sizeof(int),
 501                 .mode           = 0644,
 502                 .proc_handler   = proc_dointvec,
 503         },
 504         {
 505                 .procname       = "cipso_rbm_strictvalid",
 506                 .data           = &cipso_v4_rbm_strictvalid,
 507                 .maxlen         = sizeof(int),
 508                 .mode           = 0644,
 509                 .proc_handler   = proc_dointvec,
 510         },
 511 #endif /* CONFIG_NETLABEL */
 512         {
 513                 .procname       = "tcp_available_congestion_control",
 514                 .maxlen         = TCP_CA_BUF_MAX,
 515                 .mode           = 0444,
 516                 .proc_handler   = proc_tcp_available_congestion_control,
 517         },
 518         {
 519                 .procname       = "tcp_allowed_congestion_control",
 520                 .maxlen         = TCP_CA_BUF_MAX,
 521                 .mode           = 0644,
 522                 .proc_handler   = proc_allowed_congestion_control,
 523         },
 524         {
 525                 .procname       = "tcp_available_ulp",
 526                 .maxlen         = TCP_ULP_BUF_MAX,
 527                 .mode           = 0444,
 528                 .proc_handler   = proc_tcp_available_ulp,
 529         },
 530         {
 531                 .procname       = "icmp_msgs_per_sec",
 532                 .data           = &sysctl_icmp_msgs_per_sec,
 533                 .maxlen         = sizeof(int),
 534                 .mode           = 0644,
 535                 .proc_handler   = proc_dointvec_minmax,
 536                 .extra1         = &zero,
 537         },
 538         {
 539                 .procname       = "icmp_msgs_burst",
 540                 .data           = &sysctl_icmp_msgs_burst,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_dointvec_minmax,
 544                 .extra1         = &zero,
 545         },
 546         {
 547                 .procname       = "udp_mem",
 548                 .data           = &sysctl_udp_mem,
 549                 .maxlen         = sizeof(sysctl_udp_mem),
 550                 .mode           = 0644,
 551                 .proc_handler   = proc_doulongvec_minmax,
 552         },
 553         {
 554                 .procname       = "fib_sync_mem",
 555                 .data           = &sysctl_fib_sync_mem,
 556                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 557                 .mode           = 0644,
 558                 .proc_handler   = proc_douintvec_minmax,
 559                 .extra1         = &sysctl_fib_sync_mem_min,
 560                 .extra2         = &sysctl_fib_sync_mem_max,
 561         },
 562         { }
 563 };
 564
 565 static struct ctl_table ipv4_net_table[] = {
 566         {
 567                 .procname       = "icmp_echo_ignore_all",
 568                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = proc_dointvec
 572         },
 573         {
 574                 .procname       = "icmp_echo_ignore_broadcasts",
 575                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 576                 .maxlen         = sizeof(int),
 577                 .mode           = 0644,
 578                 .proc_handler   = proc_dointvec
 579         },
 580         {
 581                 .procname       = "icmp_ignore_bogus_error_responses",
 582                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = proc_dointvec
 586         },
 587         {
 588                 .procname       = "icmp_errors_use_inbound_ifaddr",
 589                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = proc_dointvec
 593         },
 594         {
 595                 .procname       = "icmp_ratelimit",
 596                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = proc_dointvec_ms_jiffies,
 600         },
 601         {
 602                 .procname       = "icmp_ratemask",
 603                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = proc_dointvec
 607         },
 608         {
 609                 .procname       = "ping_group_range",
 610                 .data           = &init_net.ipv4.ping_group_range.range,
 611                 .maxlen         = sizeof(gid_t)*2,
 612                 .mode           = 0644,
 613                 .proc_handler   = ipv4_ping_group_range,
 614         },
 615 #ifdef CONFIG_NET_L3_MASTER_DEV
 616         {
 617                 .procname       = "raw_l3mdev_accept",
 618                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 619                 .maxlen         = sizeof(int),
 620                 .mode           = 0644,
 621                 .proc_handler   = proc_dointvec_minmax,
 622                 .extra1         = &zero,
 623                 .extra2         = &one,
 624         },
 625 #endif
 626         {
 627                 .procname       = "tcp_ecn",
 628                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 629                 .maxlen         = sizeof(int),
 630                 .mode           = 0644,
 631                 .proc_handler   = proc_dointvec
 632         },
 633         {
 634                 .procname       = "tcp_ecn_fallback",
 635                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 636                 .maxlen         = sizeof(int),
 637                 .mode           = 0644,
 638                 .proc_handler   = proc_dointvec
 639         },
 640         {
 641                 .procname       = "ip_dynaddr",
 642                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 643                 .maxlen         = sizeof(int),
 644                 .mode           = 0644,
 645                 .proc_handler   = proc_dointvec
 646         },
 647         {
 648                 .procname       = "ip_early_demux",
 649                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 650                 .maxlen         = sizeof(int),
 651                 .mode           = 0644,
 652                 .proc_handler   = proc_dointvec
 653         },
 654         {
 655                 .procname       = "udp_early_demux",
 656                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 657                 .maxlen         = sizeof(int),
 658                 .mode           = 0644,
 659                 .proc_handler   = proc_udp_early_demux
 660         },
 661         {
 662                 .procname       = "tcp_early_demux",
 663                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 .proc_handler   = proc_tcp_early_demux
 667         },
 668         {
 669                 .procname       = "ip_default_ttl",
 670                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 671                 .maxlen         = sizeof(int),
 672                 .mode           = 0644,
 673                 .proc_handler   = proc_dointvec_minmax,
 674                 .extra1         = &ip_ttl_min,
 675                 .extra2         = &ip_ttl_max,
 676         },
 677         {
 678                 .procname       = "ip_local_port_range",
 679                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 680                 .data           = &init_net.ipv4.ip_local_ports.range,
 681                 .mode           = 0644,
 682                 .proc_handler   = ipv4_local_port_range,
 683         },
 684         {
 685                 .procname       = "ip_local_reserved_ports",
 686                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 687                 .maxlen         = 65536,
 688                 .mode           = 0644,
 689                 .proc_handler   = proc_do_large_bitmap,
 690         },
 691         {
 692                 .procname       = "ip_no_pmtu_disc",
 693                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 694                 .maxlen         = sizeof(int),
 695                 .mode           = 0644,
 696                 .proc_handler   = proc_dointvec
 697         },
 698         {
 699                 .procname       = "ip_forward_use_pmtu",
 700                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 701                 .maxlen         = sizeof(int),
 702                 .mode           = 0644,
 703                 .proc_handler   = proc_dointvec,
 704         },
 705         {
 706                 .procname       = "ip_forward_update_priority",
 707                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 708                 .maxlen         = sizeof(int),
 709                 .mode           = 0644,
 710                 .proc_handler   = ipv4_fwd_update_priority,
 711                 .extra1         = &zero,
 712                 .extra2         = &one,
 713         },
 714         {
 715                 .procname       = "ip_nonlocal_bind",
 716                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 717                 .maxlen         = sizeof(int),
 718                 .mode           = 0644,
 719                 .proc_handler   = proc_dointvec
 720         },
 721         {
 722                 .procname       = "fwmark_reflect",
 723                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 724                 .maxlen         = sizeof(int),
 725                 .mode           = 0644,
 726                 .proc_handler   = proc_dointvec,
 727         },
 728         {
 729                 .procname       = "tcp_fwmark_accept",
 730                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_dointvec,
 734         },
 735 #ifdef CONFIG_NET_L3_MASTER_DEV
 736         {
 737                 .procname       = "tcp_l3mdev_accept",
 738                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 739                 .maxlen         = sizeof(int),
 740                 .mode           = 0644,
 741                 .proc_handler   = proc_dointvec_minmax,
 742                 .extra1         = &zero,
 743                 .extra2         = &one,
 744         },
 745 #endif
 746         {
 747                 .procname       = "tcp_mtu_probing",
 748                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 749                 .maxlen         = sizeof(int),
 750                 .mode           = 0644,
 751                 .proc_handler   = proc_dointvec,
 752         },
 753         {
 754                 .procname       = "tcp_base_mss",
 755                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 756                 .maxlen         = sizeof(int),
 757                 .mode           = 0644,
 758                 .proc_handler   = proc_dointvec,
 759         },
 760         {
 761                 .procname       = "tcp_probe_threshold",
 762                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 763                 .maxlen         = sizeof(int),
 764                 .mode           = 0644,
 765                 .proc_handler   = proc_dointvec,
 766         },
 767         {
 768                 .procname       = "tcp_probe_interval",
 769                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 770                 .maxlen         = sizeof(u32),
 771                 .mode           = 0644,
 772                 .proc_handler   = proc_douintvec_minmax,
 773                 .extra2         = &u32_max_div_HZ,
 774         },
 775         {
 776                 .procname       = "igmp_link_local_mcast_reports",
 777                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 778                 .maxlen         = sizeof(int),
 779                 .mode           = 0644,
 780                 .proc_handler   = proc_dointvec
 781         },
 782         {
 783                 .procname       = "igmp_max_memberships",
 784                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 785                 .maxlen         = sizeof(int),
 786                 .mode           = 0644,
 787                 .proc_handler   = proc_dointvec
 788         },
 789         {
 790                 .procname       = "igmp_max_msf",
 791                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 792                 .maxlen         = sizeof(int),
 793                 .mode           = 0644,
 794                 .proc_handler   = proc_dointvec
 795         },
 796 #ifdef CONFIG_IP_MULTICAST
 797         {
 798                 .procname       = "igmp_qrv",
 799                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 800                 .maxlen         = sizeof(int),
 801                 .mode           = 0644,
 802                 .proc_handler   = proc_dointvec_minmax,
 803                 .extra1         = &one
 804         },
 805 #endif
 806         {
 807                 .procname       = "tcp_congestion_control",
 808                 .data           = &init_net.ipv4.tcp_congestion_control,
 809                 .mode           = 0644,
 810                 .maxlen         = TCP_CA_NAME_MAX,
 811                 .proc_handler   = proc_tcp_congestion_control,
 812         },
 813         {
 814                 .procname       = "tcp_keepalive_time",
 815                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 816                 .maxlen         = sizeof(int),
 817                 .mode           = 0644,
 818                 .proc_handler   = proc_dointvec_jiffies,
 819         },
 820         {
 821                 .procname       = "tcp_keepalive_probes",
 822                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 823                 .maxlen         = sizeof(int),
 824                 .mode           = 0644,
 825                 .proc_handler   = proc_dointvec
 826         },
 827         {
 828                 .procname       = "tcp_keepalive_intvl",
 829                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 830                 .maxlen         = sizeof(int),
 831                 .mode           = 0644,
 832                 .proc_handler   = proc_dointvec_jiffies,
 833         },
 834         {
 835                 .procname       = "tcp_syn_retries",
 836                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 837                 .maxlen         = sizeof(int),
 838                 .mode           = 0644,
 839                 .proc_handler   = proc_dointvec_minmax,
 840                 .extra1         = &tcp_syn_retries_min,
 841                 .extra2         = &tcp_syn_retries_max
 842         },
 843         {
 844                 .procname       = "tcp_synack_retries",
 845                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 846                 .maxlen         = sizeof(int),
 847                 .mode           = 0644,
 848                 .proc_handler   = proc_dointvec
 849         },
 850 #ifdef CONFIG_SYN_COOKIES
 851         {
 852                 .procname       = "tcp_syncookies",
 853                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 854                 .maxlen         = sizeof(int),
 855                 .mode           = 0644,
 856                 .proc_handler   = proc_dointvec
 857         },
 858 #endif
 859         {
 860                 .procname       = "tcp_reordering",
 861                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 862                 .maxlen         = sizeof(int),
 863                 .mode           = 0644,
 864                 .proc_handler   = proc_dointvec
 865         },
 866         {
 867                 .procname       = "tcp_retries1",
 868                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 869                 .maxlen         = sizeof(int),
 870                 .mode           = 0644,
 871                 .proc_handler   = proc_dointvec_minmax,
 872                 .extra2         = &tcp_retr1_max
 873         },
 874         {
 875                 .procname       = "tcp_retries2",
 876                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 877                 .maxlen         = sizeof(int),
 878                 .mode           = 0644,
 879                 .proc_handler   = proc_dointvec
 880         },
 881         {
 882                 .procname       = "tcp_orphan_retries",
 883                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 884                 .maxlen         = sizeof(int),
 885                 .mode           = 0644,
 886                 .proc_handler   = proc_dointvec
 887         },
 888         {
 889                 .procname       = "tcp_fin_timeout",
 890                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 891                 .maxlen         = sizeof(int),
 892                 .mode           = 0644,
 893                 .proc_handler   = proc_dointvec_jiffies,
 894         },
 895         {
 896                 .procname       = "tcp_notsent_lowat",
 897                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 898                 .maxlen         = sizeof(unsigned int),
 899                 .mode           = 0644,
 900                 .proc_handler   = proc_douintvec,
 901         },
 902         {
 903                 .procname       = "tcp_tw_reuse",
 904                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 905                 .maxlen         = sizeof(int),
 906                 .mode           = 0644,
 907                 .proc_handler   = proc_dointvec_minmax,
 908                 .extra1         = &zero,
 909                 .extra2         = &two,
 910         },
 911         {
 912                 .procname       = "tcp_max_tw_buckets",
 913                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 914                 .maxlen         = sizeof(int),
 915                 .mode           = 0644,
 916                 .proc_handler   = proc_dointvec
 917         },
 918         {
 919                 .procname       = "tcp_max_syn_backlog",
 920                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 921                 .maxlen         = sizeof(int),
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_dointvec
 924         },
 925         {
 926                 .procname       = "tcp_fastopen",
 927                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 928                 .maxlen         = sizeof(int),
 929                 .mode           = 0644,
 930                 .proc_handler   = proc_dointvec,
 931         },
 932         {
 933                 .procname       = "tcp_fastopen_key",
 934                 .mode           = 0600,
 935                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 936                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 937                 .proc_handler   = proc_tcp_fastopen_key,
 938         },
 939         {
 940                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
 941                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
 942                 .maxlen         = sizeof(int),
 943                 .mode           = 0644,
 944                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
 945                 .extra1         = &zero,
 946         },
 947 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 948         {
 949                 .procname       = "fib_multipath_use_neigh",
 950                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
 951                 .maxlen         = sizeof(int),
 952                 .mode           = 0644,
 953                 .proc_handler   = proc_dointvec_minmax,
 954                 .extra1         = &zero,
 955                 .extra2         = &one,
 956         },
 957         {
 958                 .procname       = "fib_multipath_hash_policy",
 959                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
 960                 .maxlen         = sizeof(int),
 961                 .mode           = 0644,
 962                 .proc_handler   = proc_fib_multipath_hash_policy,
 963                 .extra1         = &zero,
 964                 .extra2         = &one,
 965         },
 966 #endif
 967         {
 968                 .procname       = "ip_unprivileged_port_start",
 969                 .maxlen         = sizeof(int),
 970                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
 971                 .mode           = 0644,
 972                 .proc_handler   = ipv4_privileged_ports,
 973         },
 974 #ifdef CONFIG_NET_L3_MASTER_DEV
 975         {
 976                 .procname       = "udp_l3mdev_accept",
 977                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
 978                 .maxlen         = sizeof(int),
 979                 .mode           = 0644,
 980                 .proc_handler   = proc_dointvec_minmax,
 981                 .extra1         = &zero,
 982                 .extra2         = &one,
 983         },
 984 #endif
 985         {
 986                 .procname       = "tcp_sack",
 987                 .data           = &init_net.ipv4.sysctl_tcp_sack,
 988                 .maxlen         = sizeof(int),
 989                 .mode           = 0644,
 990                 .proc_handler   = proc_dointvec
 991         },
 992         {
 993                 .procname       = "tcp_window_scaling",
 994                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
 995                 .maxlen         = sizeof(int),
 996                 .mode           = 0644,
 997                 .proc_handler   = proc_dointvec
 998         },
 999         {
1000                 .procname       = "tcp_timestamps",
1001                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1002                 .maxlen         = sizeof(int),
1003                 .mode           = 0644,
1004                 .proc_handler   = proc_dointvec
1005         },
1006         {
1007                 .procname       = "tcp_early_retrans",
1008                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1009                 .maxlen         = sizeof(int),
1010                 .mode           = 0644,
1011                 .proc_handler   = proc_dointvec_minmax,
1012                 .extra1         = &zero,
1013                 .extra2         = &four,
1014         },
1015         {
1016                 .procname       = "tcp_recovery",
1017                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1018                 .maxlen         = sizeof(int),
1019                 .mode           = 0644,
1020                 .proc_handler   = proc_dointvec,
1021         },
1022         {
1023                 .procname       = "tcp_thin_linear_timeouts",
1024                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1025                 .maxlen         = sizeof(int),
1026                 .mode           = 0644,
1027                 .proc_handler   = proc_dointvec
1028         },
1029         {
1030                 .procname       = "tcp_slow_start_after_idle",
1031                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1032                 .maxlen         = sizeof(int),
1033                 .mode           = 0644,
1034                 .proc_handler   = proc_dointvec
1035         },
1036         {
1037                 .procname       = "tcp_retrans_collapse",
1038                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1039                 .maxlen         = sizeof(int),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_dointvec
1042         },
1043         {
1044                 .procname       = "tcp_stdurg",
1045                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1046                 .maxlen         = sizeof(int),
1047                 .mode           = 0644,
1048                 .proc_handler   = proc_dointvec
1049         },
1050         {
1051                 .procname       = "tcp_rfc1337",
1052                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1053                 .maxlen         = sizeof(int),
1054                 .mode           = 0644,
1055                 .proc_handler   = proc_dointvec
1056         },
1057         {
1058                 .procname       = "tcp_abort_on_overflow",
1059                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1060                 .maxlen         = sizeof(int),
1061                 .mode           = 0644,
1062                 .proc_handler   = proc_dointvec
1063         },
1064         {
1065                 .procname       = "tcp_fack",
1066                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1067                 .maxlen         = sizeof(int),
1068                 .mode           = 0644,
1069                 .proc_handler   = proc_dointvec
1070         },
1071         {
1072                 .procname       = "tcp_max_reordering",
1073                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1074                 .maxlen         = sizeof(int),
1075                 .mode           = 0644,
1076                 .proc_handler   = proc_dointvec
1077         },
1078         {
1079                 .procname       = "tcp_dsack",
1080                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1081                 .maxlen         = sizeof(int),
1082                 .mode           = 0644,
1083                 .proc_handler   = proc_dointvec
1084         },
1085         {
1086                 .procname       = "tcp_app_win",
1087                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1088                 .maxlen         = sizeof(int),
1089                 .mode           = 0644,
1090                 .proc_handler   = proc_dointvec
1091         },
1092         {
1093                 .procname       = "tcp_adv_win_scale",
1094                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1095                 .maxlen         = sizeof(int),
1096                 .mode           = 0644,
1097                 .proc_handler   = proc_dointvec_minmax,
1098                 .extra1         = &tcp_adv_win_scale_min,
1099                 .extra2         = &tcp_adv_win_scale_max,
1100         },
1101         {
1102                 .procname       = "tcp_frto",
1103                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1104                 .maxlen         = sizeof(int),
1105                 .mode           = 0644,
1106                 .proc_handler   = proc_dointvec
1107         },
1108         {
1109                 .procname       = "tcp_no_metrics_save",
1110                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1111                 .maxlen         = sizeof(int),
1112                 .mode           = 0644,
1113                 .proc_handler   = proc_dointvec,
1114         },
1115         {
1116                 .procname       = "tcp_moderate_rcvbuf",
1117                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1118                 .maxlen         = sizeof(int),
1119                 .mode           = 0644,
1120                 .proc_handler   = proc_dointvec,
1121         },
1122         {
1123                 .procname       = "tcp_tso_win_divisor",
1124                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1125                 .maxlen         = sizeof(int),
1126                 .mode           = 0644,
1127                 .proc_handler   = proc_dointvec,
1128         },
1129         {
1130                 .procname       = "tcp_workaround_signed_windows",
1131                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1132                 .maxlen         = sizeof(int),
1133                 .mode           = 0644,
1134                 .proc_handler   = proc_dointvec
1135         },
1136         {
1137                 .procname       = "tcp_limit_output_bytes",
1138                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1139                 .maxlen         = sizeof(int),
1140                 .mode           = 0644,
1141                 .proc_handler   = proc_dointvec
1142         },
1143         {
1144                 .procname       = "tcp_challenge_ack_limit",
1145                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1146                 .maxlen         = sizeof(int),
1147                 .mode           = 0644,
1148                 .proc_handler   = proc_dointvec
1149         },
1150         {
1151                 .procname       = "tcp_min_tso_segs",
1152                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1153                 .maxlen         = sizeof(int),
1154                 .mode           = 0644,
1155                 .proc_handler   = proc_dointvec_minmax,
1156                 .extra1         = &one,
1157                 .extra2         = &gso_max_segs,
1158         },
1159         {
1160                 .procname       = "tcp_min_rtt_wlen",
1161                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1162                 .maxlen         = sizeof(int),
1163                 .mode           = 0644,
1164                 .proc_handler   = proc_dointvec_minmax,
1165                 .extra1         = &zero,
1166                 .extra2         = &one_day_secs
1167         },
1168         {
1169                 .procname       = "tcp_autocorking",
1170                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1171                 .maxlen         = sizeof(int),
1172                 .mode           = 0644,
1173                 .proc_handler   = proc_dointvec_minmax,
1174                 .extra1         = &zero,
1175                 .extra2         = &one,
1176         },
1177         {
1178                 .procname       = "tcp_invalid_ratelimit",
1179                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1180                 .maxlen         = sizeof(int),
1181                 .mode           = 0644,
1182                 .proc_handler   = proc_dointvec_ms_jiffies,
1183         },
1184         {
1185                 .procname       = "tcp_pacing_ss_ratio",
1186                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1187                 .maxlen         = sizeof(int),
1188                 .mode           = 0644,
1189                 .proc_handler   = proc_dointvec_minmax,
1190                 .extra1         = &zero,
1191                 .extra2         = &thousand,
1192         },
1193         {
1194                 .procname       = "tcp_pacing_ca_ratio",
1195                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1196                 .maxlen         = sizeof(int),
1197                 .mode           = 0644,
1198                 .proc_handler   = proc_dointvec_minmax,
1199                 .extra1         = &zero,
1200                 .extra2         = &thousand,
1201         },
1202         {
1203                 .procname       = "tcp_wmem",
1204                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1205                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1206                 .mode           = 0644,
1207                 .proc_handler   = proc_dointvec_minmax,
1208                 .extra1         = &one,
1209         },
1210         {
1211                 .procname       = "tcp_rmem",
1212                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1213                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1214                 .mode           = 0644,
1215                 .proc_handler   = proc_dointvec_minmax,
1216                 .extra1         = &one,
1217         },
1218         {
1219                 .procname       = "tcp_comp_sack_delay_ns",
1220                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1221                 .maxlen         = sizeof(unsigned long),
1222                 .mode           = 0644,
1223                 .proc_handler   = proc_doulongvec_minmax,
1224         },
1225         {
1226                 .procname       = "tcp_comp_sack_nr",
1227                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1228                 .maxlen         = sizeof(int),
1229                 .mode           = 0644,
1230                 .proc_handler   = proc_dointvec_minmax,
1231                 .extra1         = &zero,
1232                 .extra2         = &comp_sack_nr_max,
1233         },
1234         {
1235                 .procname       = "udp_rmem_min",
1236                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1237                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1238                 .mode           = 0644,
1239                 .proc_handler   = proc_dointvec_minmax,
1240                 .extra1         = &one
1241         },
1242         {
1243                 .procname       = "udp_wmem_min",
1244                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1245                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1246                 .mode           = 0644,
1247                 .proc_handler   = proc_dointvec_minmax,
1248                 .extra1         = &one
1249         },
1250         { }
1251 };
1252
1253 static __net_init int ipv4_sysctl_init_net(struct net *net)
1254 {
1255         struct ctl_table *table;
1256
1257         table = ipv4_net_table;
1258         if (!net_eq(net, &init_net)) {
1259                 int i;
1260
1261                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1262                 if (!table)
1263                         goto err_alloc;
1264
1265                 /* Update the variables to point into the current struct net */
1266                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1267                         table[i].data += (void *)net - (void *)&init_net;
1268         }
1269
1270         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1271         if (!net->ipv4.ipv4_hdr)
1272                 goto err_reg;
1273
1274         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1275         if (!net->ipv4.sysctl_local_reserved_ports)
1276                 goto err_ports;
1277
1278         return 0;
1279
1280 err_ports:
1281         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1282 err_reg:
1283         if (!net_eq(net, &init_net))
1284                 kfree(table);
1285 err_alloc:
1286         return -ENOMEM;
1287 }
1288
1289 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1290 {
1291         struct ctl_table *table;
1292
1293         kfree(net->ipv4.sysctl_local_reserved_ports);
1294         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1295         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1296         kfree(table);
1297 }
1298
1299 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1300         .init = ipv4_sysctl_init_net,
1301         .exit = ipv4_sysctl_exit_net,
1302 };
1303
1304 static __init int sysctl_ipv4_init(void)
1305 {
1306         struct ctl_table_header *hdr;
1307
1308         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1309         if (!hdr)
1310                 return -ENOMEM;
1311
1312         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1313                 unregister_net_sysctl_table(hdr);
1314                 return -ENOMEM;
1315         }
1316
1317         return 0;
1318 }
1319
1320 __initcall(sysctl_ipv4_init);