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 tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  43 static int tcp_min_snd_mss_max = 65535;
  44 static int ip_privileged_port_min;
  45 static int ip_privileged_port_max = 65535;
  46 static int ip_ttl_min = 1;
  47 static int ip_ttl_max = 255;
  48 static int tcp_syn_retries_min = 1;
  49 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  50 static int ip_ping_group_range_min[] = { 0, 0 };
  51 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  52 static int comp_sack_nr_max = 255;
  53 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  54 static int one_day_secs = 24 * 3600;
  55
  56 /* obsolete */
  57 static int sysctl_tcp_low_latency __read_mostly;
  58
  59 /* Update system visible IP port range */
  60 static void set_local_port_range(struct net *net, int range[2])
  61 {
  62         bool same_parity = !((range[0] ^ range[1]) & 1);
  63
  64         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  65         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  66                 net->ipv4.ip_local_ports.warned = true;
  67                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  68         }
  69         net->ipv4.ip_local_ports.range[0] = range[0];
  70         net->ipv4.ip_local_ports.range[1] = range[1];
  71         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  72 }
  73
  74 /* Validate changes from /proc interface. */
  75 static int ipv4_local_port_range(struct ctl_table *table, int write,
  76                                  void __user *buffer,
  77                                  size_t *lenp, loff_t *ppos)
  78 {
  79         struct net *net =
  80                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  81         int ret;
  82         int range[2];
  83         struct ctl_table tmp = {
  84                 .data = &range,
  85                 .maxlen = sizeof(range),
  86                 .mode = table->mode,
  87                 .extra1 = &ip_local_port_range_min,
  88                 .extra2 = &ip_local_port_range_max,
  89         };
  90
  91         inet_get_local_port_range(net, &range[0], &range[1]);
  92
  93         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  94
  95         if (write && ret == 0) {
  96                 /* Ensure that the upper limit is not smaller than the lower,
  97                  * and that the lower does not encroach upon the privileged
  98                  * port limit.
  99                  */
 100                 if ((range[1] < range[0]) ||
 101                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
 102                         ret = -EINVAL;
 103                 else
 104                         set_local_port_range(net, range);
 105         }
 106
 107         return ret;
 108 }
 109
 110 /* Validate changes from /proc interface. */
 111 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 112                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 113 {
 114         struct net *net = container_of(table->data, struct net,
 115             ipv4.sysctl_ip_prot_sock);
 116         int ret;
 117         int pports;
 118         int range[2];
 119         struct ctl_table tmp = {
 120                 .data = &pports,
 121                 .maxlen = sizeof(pports),
 122                 .mode = table->mode,
 123                 .extra1 = &ip_privileged_port_min,
 124                 .extra2 = &ip_privileged_port_max,
 125         };
 126
 127         pports = net->ipv4.sysctl_ip_prot_sock;
 128
 129         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 130
 131         if (write && ret == 0) {
 132                 inet_get_local_port_range(net, &range[0], &range[1]);
 133                 /* Ensure that the local port range doesn't overlap with the
 134                  * privileged port range.
 135                  */
 136                 if (range[0] < pports)
 137                         ret = -EINVAL;
 138                 else
 139                         net->ipv4.sysctl_ip_prot_sock = pports;
 140         }
 141
 142         return ret;
 143 }
 144
 145 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 146 {
 147         kgid_t *data = table->data;
 148         struct net *net =
 149                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 150         unsigned int seq;
 151         do {
 152                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 153
 154                 *low = data[0];
 155                 *high = data[1];
 156         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 157 }
 158
 159 /* Update system visible IP port range */
 160 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 161 {
 162         kgid_t *data = table->data;
 163         struct net *net =
 164                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 165         write_seqlock(&net->ipv4.ping_group_range.lock);
 166         data[0] = low;
 167         data[1] = high;
 168         write_sequnlock(&net->ipv4.ping_group_range.lock);
 169 }
 170
 171 /* Validate changes from /proc interface. */
 172 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 173                                  void __user *buffer,
 174                                  size_t *lenp, loff_t *ppos)
 175 {
 176         struct user_namespace *user_ns = current_user_ns();
 177         int ret;
 178         gid_t urange[2];
 179         kgid_t low, high;
 180         struct ctl_table tmp = {
 181                 .data = &urange,
 182                 .maxlen = sizeof(urange),
 183                 .mode = table->mode,
 184                 .extra1 = &ip_ping_group_range_min,
 185                 .extra2 = &ip_ping_group_range_max,
 186         };
 187
 188         inet_get_ping_group_range_table(table, &low, &high);
 189         urange[0] = from_kgid_munged(user_ns, low);
 190         urange[1] = from_kgid_munged(user_ns, high);
 191         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 192
 193         if (write && ret == 0) {
 194                 low = make_kgid(user_ns, urange[0]);
 195                 high = make_kgid(user_ns, urange[1]);
 196                 if (!gid_valid(low) || !gid_valid(high))
 197                         return -EINVAL;
 198                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 199                         low = make_kgid(&init_user_ns, 1);
 200                         high = make_kgid(&init_user_ns, 0);
 201                 }
 202                 set_ping_group_range(table, low, high);
 203         }
 204
 205         return ret;
 206 }
 207
 208 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 209                                     void __user *buffer,
 210                                     size_t *lenp, loff_t *ppos)
 211 {
 212         struct net *net;
 213         int ret;
 214
 215         net = container_of(table->data, struct net,
 216                            ipv4.sysctl_ip_fwd_update_priority);
 217         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 218         if (write && ret == 0)
 219                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 220                                         net);
 221
 222         return ret;
 223 }
 224
 225 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 226                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 227 {
 228         struct net *net = container_of(ctl->data, struct net,
 229                                        ipv4.tcp_congestion_control);
 230         char val[TCP_CA_NAME_MAX];
 231         struct ctl_table tbl = {
 232                 .data = val,
 233                 .maxlen = TCP_CA_NAME_MAX,
 234         };
 235         int ret;
 236
 237         tcp_get_default_congestion_control(net, val);
 238
 239         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 240         if (write && ret == 0)
 241                 ret = tcp_set_default_congestion_control(net, val);
 242         return ret;
 243 }
 244
 245 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 246                                                  int write,
 247                                                  void __user *buffer, size_t *lenp,
 248                                                  loff_t *ppos)
 249 {
 250         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 251         int ret;
 252
 253         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 254         if (!tbl.data)
 255                 return -ENOMEM;
 256         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 257         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 258         kfree(tbl.data);
 259         return ret;
 260 }
 261
 262 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 263                                            int write,
 264                                            void __user *buffer, size_t *lenp,
 265                                            loff_t *ppos)
 266 {
 267         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 268         int ret;
 269
 270         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 271         if (!tbl.data)
 272                 return -ENOMEM;
 273
 274         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 275         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 276         if (write && ret == 0)
 277                 ret = tcp_set_allowed_congestion_control(tbl.data);
 278         kfree(tbl.data);
 279         return ret;
 280 }
 281
 282 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 283                                  void __user *buffer, size_t *lenp,
 284                                  loff_t *ppos)
 285 {
 286         struct net *net = container_of(table->data, struct net,
 287             ipv4.sysctl_tcp_fastopen);
 288         struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
 289         struct tcp_fastopen_context *ctxt;
 290         u32  user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
 291         __le32 key[4];
 292         int ret, i;
 293
 294         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 295         if (!tbl.data)
 296                 return -ENOMEM;
 297
 298         rcu_read_lock();
 299         ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 300         if (ctxt)
 301                 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
 302         else
 303                 memset(key, 0, sizeof(key));
 304         rcu_read_unlock();
 305
 306         for (i = 0; i < ARRAY_SIZE(key); i++)
 307                 user_key[i] = le32_to_cpu(key[i]);
 308
 309         snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
 310                 user_key[0], user_key[1], user_key[2], user_key[3]);
 311         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 312
 313         if (write && ret == 0) {
 314                 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
 315                            user_key + 2, user_key + 3) != 4) {
 316                         ret = -EINVAL;
 317                         goto bad_key;
 318                 }
 319
 320                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 321                         key[i] = cpu_to_le32(user_key[i]);
 322
 323                 tcp_fastopen_reset_cipher(net, NULL, key,
 324                                           TCP_FASTOPEN_KEY_LENGTH);
 325         }
 326
 327 bad_key:
 328         pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 329                 user_key[0], user_key[1], user_key[2], user_key[3],
 330                (char *)tbl.data, ret);
 331         kfree(tbl.data);
 332         return ret;
 333 }
 334
 335 static void proc_configure_early_demux(int enabled, int protocol)
 336 {
 337         struct net_protocol *ipprot;
 338 #if IS_ENABLED(CONFIG_IPV6)
 339         struct inet6_protocol *ip6prot;
 340 #endif
 341
 342         rcu_read_lock();
 343
 344         ipprot = rcu_dereference(inet_protos[protocol]);
 345         if (ipprot)
 346                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 347                                                 NULL;
 348
 349 #if IS_ENABLED(CONFIG_IPV6)
 350         ip6prot = rcu_dereference(inet6_protos[protocol]);
 351         if (ip6prot)
 352                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 353                                                  NULL;
 354 #endif
 355         rcu_read_unlock();
 356 }
 357
 358 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 359                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 360 {
 361         int ret = 0;
 362
 363         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 364
 365         if (write && !ret) {
 366                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 367
 368                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 369         }
 370
 371         return ret;
 372 }
 373
 374 static int proc_udp_early_demux(struct ctl_table *table, int write,
 375                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 376 {
 377         int ret = 0;
 378
 379         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 380
 381         if (write && !ret) {
 382                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 383
 384                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 385         }
 386
 387         return ret;
 388 }
 389
 390 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 391                                              int write,
 392                                              void __user *buffer,
 393                                              size_t *lenp, loff_t *ppos)
 394 {
 395         struct net *net = container_of(table->data, struct net,
 396             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 397         int ret;
 398
 399         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 400         if (write && ret == 0)
 401                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 402
 403         return ret;
 404 }
 405
 406 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 407                                   int write,
 408                                   void __user *buffer, size_t *lenp,
 409                                   loff_t *ppos)
 410 {
 411         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 412         int ret;
 413
 414         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 415         if (!tbl.data)
 416                 return -ENOMEM;
 417         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 418         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 419         kfree(tbl.data);
 420
 421         return ret;
 422 }
 423
 424 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 425 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 426                                           void __user *buffer, size_t *lenp,
 427                                           loff_t *ppos)
 428 {
 429         struct net *net = container_of(table->data, struct net,
 430             ipv4.sysctl_fib_multipath_hash_policy);
 431         int ret;
 432
 433         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 434         if (write && ret == 0)
 435                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 436
 437         return ret;
 438 }
 439 #endif
 440
 441 static struct ctl_table ipv4_table[] = {
 442         {
 443                 .procname       = "tcp_max_orphans",
 444                 .data           = &sysctl_tcp_max_orphans,
 445                 .maxlen         = sizeof(int),
 446                 .mode           = 0644,
 447                 .proc_handler   = proc_dointvec
 448         },
 449         {
 450                 .procname       = "inet_peer_threshold",
 451                 .data           = &inet_peer_threshold,
 452                 .maxlen         = sizeof(int),
 453                 .mode           = 0644,
 454                 .proc_handler   = proc_dointvec
 455         },
 456         {
 457                 .procname       = "inet_peer_minttl",
 458                 .data           = &inet_peer_minttl,
 459                 .maxlen         = sizeof(int),
 460                 .mode           = 0644,
 461                 .proc_handler   = proc_dointvec_jiffies,
 462         },
 463         {
 464                 .procname       = "inet_peer_maxttl",
 465                 .data           = &inet_peer_maxttl,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec_jiffies,
 469         },
 470         {
 471                 .procname       = "tcp_mem",
 472                 .maxlen         = sizeof(sysctl_tcp_mem),
 473                 .data           = &sysctl_tcp_mem,
 474                 .mode           = 0644,
 475                 .proc_handler   = proc_doulongvec_minmax,
 476         },
 477         {
 478                 .procname       = "tcp_low_latency",
 479                 .data           = &sysctl_tcp_low_latency,
 480                 .maxlen         = sizeof(int),
 481                 .mode           = 0644,
 482                 .proc_handler   = proc_dointvec
 483         },
 484 #ifdef CONFIG_NETLABEL
 485         {
 486                 .procname       = "cipso_cache_enable",
 487                 .data           = &cipso_v4_cache_enabled,
 488                 .maxlen         = sizeof(int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec,
 491         },
 492         {
 493                 .procname       = "cipso_cache_bucket_size",
 494                 .data           = &cipso_v4_cache_bucketsize,
 495                 .maxlen         = sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = proc_dointvec,
 498         },
 499         {
 500                 .procname       = "cipso_rbm_optfmt",
 501                 .data           = &cipso_v4_rbm_optfmt,
 502                 .maxlen         = sizeof(int),
 503                 .mode           = 0644,
 504                 .proc_handler   = proc_dointvec,
 505         },
 506         {
 507                 .procname       = "cipso_rbm_strictvalid",
 508                 .data           = &cipso_v4_rbm_strictvalid,
 509                 .maxlen         = sizeof(int),
 510                 .mode           = 0644,
 511                 .proc_handler   = proc_dointvec,
 512         },
 513 #endif /* CONFIG_NETLABEL */
 514         {
 515                 .procname       = "tcp_available_congestion_control",
 516                 .maxlen         = TCP_CA_BUF_MAX,
 517                 .mode           = 0444,
 518                 .proc_handler   = proc_tcp_available_congestion_control,
 519         },
 520         {
 521                 .procname       = "tcp_allowed_congestion_control",
 522                 .maxlen         = TCP_CA_BUF_MAX,
 523                 .mode           = 0644,
 524                 .proc_handler   = proc_allowed_congestion_control,
 525         },
 526         {
 527                 .procname       = "tcp_available_ulp",
 528                 .maxlen         = TCP_ULP_BUF_MAX,
 529                 .mode           = 0444,
 530                 .proc_handler   = proc_tcp_available_ulp,
 531         },
 532         {
 533                 .procname       = "icmp_msgs_per_sec",
 534                 .data           = &sysctl_icmp_msgs_per_sec,
 535                 .maxlen         = sizeof(int),
 536                 .mode           = 0644,
 537                 .proc_handler   = proc_dointvec_minmax,
 538                 .extra1         = &zero,
 539         },
 540         {
 541                 .procname       = "icmp_msgs_burst",
 542                 .data           = &sysctl_icmp_msgs_burst,
 543                 .maxlen         = sizeof(int),
 544                 .mode           = 0644,
 545                 .proc_handler   = proc_dointvec_minmax,
 546                 .extra1         = &zero,
 547         },
 548         {
 549                 .procname       = "udp_mem",
 550                 .data           = &sysctl_udp_mem,
 551                 .maxlen         = sizeof(sysctl_udp_mem),
 552                 .mode           = 0644,
 553                 .proc_handler   = proc_doulongvec_minmax,
 554         },
 555         { }
 556 };
 557
 558 static struct ctl_table ipv4_net_table[] = {
 559         {
 560                 .procname       = "icmp_echo_ignore_all",
 561                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 562                 .maxlen         = sizeof(int),
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_dointvec
 565         },
 566         {
 567                 .procname       = "icmp_echo_ignore_broadcasts",
 568                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 569                 .maxlen         = sizeof(int),
 570                 .mode           = 0644,
 571                 .proc_handler   = proc_dointvec
 572         },
 573         {
 574                 .procname       = "icmp_ignore_bogus_error_responses",
 575                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 576                 .maxlen         = sizeof(int),
 577                 .mode           = 0644,
 578                 .proc_handler   = proc_dointvec
 579         },
 580         {
 581                 .procname       = "icmp_errors_use_inbound_ifaddr",
 582                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = proc_dointvec
 586         },
 587         {
 588                 .procname       = "icmp_ratelimit",
 589                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = proc_dointvec_ms_jiffies,
 593         },
 594         {
 595                 .procname       = "icmp_ratemask",
 596                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = proc_dointvec
 600         },
 601         {
 602                 .procname       = "ping_group_range",
 603                 .data           = &init_net.ipv4.ping_group_range.range,
 604                 .maxlen         = sizeof(gid_t)*2,
 605                 .mode           = 0644,
 606                 .proc_handler   = ipv4_ping_group_range,
 607         },
 608         {
 609                 .procname       = "tcp_ecn",
 610                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 611                 .maxlen         = sizeof(int),
 612                 .mode           = 0644,
 613                 .proc_handler   = proc_dointvec
 614         },
 615         {
 616                 .procname       = "tcp_ecn_fallback",
 617                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 618                 .maxlen         = sizeof(int),
 619                 .mode           = 0644,
 620                 .proc_handler   = proc_dointvec
 621         },
 622         {
 623                 .procname       = "ip_dynaddr",
 624                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 625                 .maxlen         = sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = proc_dointvec
 628         },
 629         {
 630                 .procname       = "ip_early_demux",
 631                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 632                 .maxlen         = sizeof(int),
 633                 .mode           = 0644,
 634                 .proc_handler   = proc_dointvec
 635         },
 636         {
 637                 .procname       = "udp_early_demux",
 638                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 .proc_handler   = proc_udp_early_demux
 642         },
 643         {
 644                 .procname       = "tcp_early_demux",
 645                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 646                 .maxlen         = sizeof(int),
 647                 .mode           = 0644,
 648                 .proc_handler   = proc_tcp_early_demux
 649         },
 650         {
 651                 .procname       = "ip_default_ttl",
 652                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 653                 .maxlen         = sizeof(int),
 654                 .mode           = 0644,
 655                 .proc_handler   = proc_dointvec_minmax,
 656                 .extra1         = &ip_ttl_min,
 657                 .extra2         = &ip_ttl_max,
 658         },
 659         {
 660                 .procname       = "ip_local_port_range",
 661                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 662                 .data           = &init_net.ipv4.ip_local_ports.range,
 663                 .mode           = 0644,
 664                 .proc_handler   = ipv4_local_port_range,
 665         },
 666         {
 667                 .procname       = "ip_local_reserved_ports",
 668                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 669                 .maxlen         = 65536,
 670                 .mode           = 0644,
 671                 .proc_handler   = proc_do_large_bitmap,
 672         },
 673         {
 674                 .procname       = "ip_no_pmtu_disc",
 675                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 676                 .maxlen         = sizeof(int),
 677                 .mode           = 0644,
 678                 .proc_handler   = proc_dointvec
 679         },
 680         {
 681                 .procname       = "ip_forward_use_pmtu",
 682                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 683                 .maxlen         = sizeof(int),
 684                 .mode           = 0644,
 685                 .proc_handler   = proc_dointvec,
 686         },
 687         {
 688                 .procname       = "ip_forward_update_priority",
 689                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 690                 .maxlen         = sizeof(int),
 691                 .mode           = 0644,
 692                 .proc_handler   = ipv4_fwd_update_priority,
 693                 .extra1         = &zero,
 694                 .extra2         = &one,
 695         },
 696         {
 697                 .procname       = "ip_nonlocal_bind",
 698                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 699                 .maxlen         = sizeof(int),
 700                 .mode           = 0644,
 701                 .proc_handler   = proc_dointvec
 702         },
 703         {
 704                 .procname       = "fwmark_reflect",
 705                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 706                 .maxlen         = sizeof(int),
 707                 .mode           = 0644,
 708                 .proc_handler   = proc_dointvec,
 709         },
 710         {
 711                 .procname       = "tcp_fwmark_accept",
 712                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 713                 .maxlen         = sizeof(int),
 714                 .mode           = 0644,
 715                 .proc_handler   = proc_dointvec,
 716         },
 717 #ifdef CONFIG_NET_L3_MASTER_DEV
 718         {
 719                 .procname       = "tcp_l3mdev_accept",
 720                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 721                 .maxlen         = sizeof(int),
 722                 .mode           = 0644,
 723                 .proc_handler   = proc_dointvec_minmax,
 724                 .extra1         = &zero,
 725                 .extra2         = &one,
 726         },
 727 #endif
 728         {
 729                 .procname       = "tcp_mtu_probing",
 730                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_dointvec,
 734         },
 735         {
 736                 .procname       = "tcp_base_mss",
 737                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 738                 .maxlen         = sizeof(int),
 739                 .mode           = 0644,
 740                 .proc_handler   = proc_dointvec,
 741         },
 742         {
 743                 .procname       = "tcp_min_snd_mss",
 744                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 745                 .maxlen         = sizeof(int),
 746                 .mode           = 0644,
 747                 .proc_handler   = proc_dointvec_minmax,
 748                 .extra1         = &tcp_min_snd_mss_min,
 749                 .extra2         = &tcp_min_snd_mss_max,
 750         },
 751         {
 752                 .procname       = "tcp_probe_threshold",
 753                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 754                 .maxlen         = sizeof(int),
 755                 .mode           = 0644,
 756                 .proc_handler   = proc_dointvec,
 757         },
 758         {
 759                 .procname       = "tcp_probe_interval",
 760                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 761                 .maxlen         = sizeof(u32),
 762                 .mode           = 0644,
 763                 .proc_handler   = proc_douintvec_minmax,
 764                 .extra2         = &u32_max_div_HZ,
 765         },
 766         {
 767                 .procname       = "igmp_link_local_mcast_reports",
 768                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 769                 .maxlen         = sizeof(int),
 770                 .mode           = 0644,
 771                 .proc_handler   = proc_dointvec
 772         },
 773         {
 774                 .procname       = "igmp_max_memberships",
 775                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 776                 .maxlen         = sizeof(int),
 777                 .mode           = 0644,
 778                 .proc_handler   = proc_dointvec
 779         },
 780         {
 781                 .procname       = "igmp_max_msf",
 782                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 783                 .maxlen         = sizeof(int),
 784                 .mode           = 0644,
 785                 .proc_handler   = proc_dointvec
 786         },
 787 #ifdef CONFIG_IP_MULTICAST
 788         {
 789                 .procname       = "igmp_qrv",
 790                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 791                 .maxlen         = sizeof(int),
 792                 .mode           = 0644,
 793                 .proc_handler   = proc_dointvec_minmax,
 794                 .extra1         = &one
 795         },
 796 #endif
 797         {
 798                 .procname       = "tcp_congestion_control",
 799                 .data           = &init_net.ipv4.tcp_congestion_control,
 800                 .mode           = 0644,
 801                 .maxlen         = TCP_CA_NAME_MAX,
 802                 .proc_handler   = proc_tcp_congestion_control,
 803         },
 804         {
 805                 .procname       = "tcp_keepalive_time",
 806                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 807                 .maxlen         = sizeof(int),
 808                 .mode           = 0644,
 809                 .proc_handler   = proc_dointvec_jiffies,
 810         },
 811         {
 812                 .procname       = "tcp_keepalive_probes",
 813                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 814                 .maxlen         = sizeof(int),
 815                 .mode           = 0644,
 816                 .proc_handler   = proc_dointvec
 817         },
 818         {
 819                 .procname       = "tcp_keepalive_intvl",
 820                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 821                 .maxlen         = sizeof(int),
 822                 .mode           = 0644,
 823                 .proc_handler   = proc_dointvec_jiffies,
 824         },
 825         {
 826                 .procname       = "tcp_syn_retries",
 827                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 828                 .maxlen         = sizeof(int),
 829                 .mode           = 0644,
 830                 .proc_handler   = proc_dointvec_minmax,
 831                 .extra1         = &tcp_syn_retries_min,
 832                 .extra2         = &tcp_syn_retries_max
 833         },
 834         {
 835                 .procname       = "tcp_synack_retries",
 836                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 837                 .maxlen         = sizeof(int),
 838                 .mode           = 0644,
 839                 .proc_handler   = proc_dointvec
 840         },
 841 #ifdef CONFIG_SYN_COOKIES
 842         {
 843                 .procname       = "tcp_syncookies",
 844                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 845                 .maxlen         = sizeof(int),
 846                 .mode           = 0644,
 847                 .proc_handler   = proc_dointvec
 848         },
 849 #endif
 850         {
 851                 .procname       = "tcp_reordering",
 852                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 853                 .maxlen         = sizeof(int),
 854                 .mode           = 0644,
 855                 .proc_handler   = proc_dointvec
 856         },
 857         {
 858                 .procname       = "tcp_retries1",
 859                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 860                 .maxlen         = sizeof(int),
 861                 .mode           = 0644,
 862                 .proc_handler   = proc_dointvec_minmax,
 863                 .extra2         = &tcp_retr1_max
 864         },
 865         {
 866                 .procname       = "tcp_retries2",
 867                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 868                 .maxlen         = sizeof(int),
 869                 .mode           = 0644,
 870                 .proc_handler   = proc_dointvec
 871         },
 872         {
 873                 .procname       = "tcp_orphan_retries",
 874                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 875                 .maxlen         = sizeof(int),
 876                 .mode           = 0644,
 877                 .proc_handler   = proc_dointvec
 878         },
 879         {
 880                 .procname       = "tcp_fin_timeout",
 881                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 882                 .maxlen         = sizeof(int),
 883                 .mode           = 0644,
 884                 .proc_handler   = proc_dointvec_jiffies,
 885         },
 886         {
 887                 .procname       = "tcp_notsent_lowat",
 888                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 889                 .maxlen         = sizeof(unsigned int),
 890                 .mode           = 0644,
 891                 .proc_handler   = proc_douintvec,
 892         },
 893         {
 894                 .procname       = "tcp_tw_reuse",
 895                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 896                 .maxlen         = sizeof(int),
 897                 .mode           = 0644,
 898                 .proc_handler   = proc_dointvec_minmax,
 899                 .extra1         = &zero,
 900                 .extra2         = &two,
 901         },
 902         {
 903                 .procname       = "tcp_max_tw_buckets",
 904                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 905                 .maxlen         = sizeof(int),
 906                 .mode           = 0644,
 907                 .proc_handler   = proc_dointvec
 908         },
 909         {
 910                 .procname       = "tcp_max_syn_backlog",
 911                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 912                 .maxlen         = sizeof(int),
 913                 .mode           = 0644,
 914                 .proc_handler   = proc_dointvec
 915         },
 916         {
 917                 .procname       = "tcp_fastopen",
 918                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 919                 .maxlen         = sizeof(int),
 920                 .mode           = 0644,
 921                 .proc_handler   = proc_dointvec,
 922         },
 923         {
 924                 .procname       = "tcp_fastopen_key",
 925                 .mode           = 0600,
 926                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 927                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 928                 .proc_handler   = proc_tcp_fastopen_key,
 929         },
 930         {
 931                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
 932                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
 933                 .maxlen         = sizeof(int),
 934                 .mode           = 0644,
 935                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
 936                 .extra1         = &zero,
 937         },
 938 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 939         {
 940                 .procname       = "fib_multipath_use_neigh",
 941                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
 942                 .maxlen         = sizeof(int),
 943                 .mode           = 0644,
 944                 .proc_handler   = proc_dointvec_minmax,
 945                 .extra1         = &zero,
 946                 .extra2         = &one,
 947         },
 948         {
 949                 .procname       = "fib_multipath_hash_policy",
 950                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
 951                 .maxlen         = sizeof(int),
 952                 .mode           = 0644,
 953                 .proc_handler   = proc_fib_multipath_hash_policy,
 954                 .extra1         = &zero,
 955                 .extra2         = &one,
 956         },
 957 #endif
 958         {
 959                 .procname       = "ip_unprivileged_port_start",
 960                 .maxlen         = sizeof(int),
 961                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
 962                 .mode           = 0644,
 963                 .proc_handler   = ipv4_privileged_ports,
 964         },
 965 #ifdef CONFIG_NET_L3_MASTER_DEV
 966         {
 967                 .procname       = "udp_l3mdev_accept",
 968                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
 969                 .maxlen         = sizeof(int),
 970                 .mode           = 0644,
 971                 .proc_handler   = proc_dointvec_minmax,
 972                 .extra1         = &zero,
 973                 .extra2         = &one,
 974         },
 975 #endif
 976         {
 977                 .procname       = "tcp_sack",
 978                 .data           = &init_net.ipv4.sysctl_tcp_sack,
 979                 .maxlen         = sizeof(int),
 980                 .mode           = 0644,
 981                 .proc_handler   = proc_dointvec
 982         },
 983         {
 984                 .procname       = "tcp_window_scaling",
 985                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
 986                 .maxlen         = sizeof(int),
 987                 .mode           = 0644,
 988                 .proc_handler   = proc_dointvec
 989         },
 990         {
 991                 .procname       = "tcp_timestamps",
 992                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
 993                 .maxlen         = sizeof(int),
 994                 .mode           = 0644,
 995                 .proc_handler   = proc_dointvec
 996         },
 997         {
 998                 .procname       = "tcp_early_retrans",
 999                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1000                 .maxlen         = sizeof(int),
1001                 .mode           = 0644,
1002                 .proc_handler   = proc_dointvec_minmax,
1003                 .extra1         = &zero,
1004                 .extra2         = &four,
1005         },
1006         {
1007                 .procname       = "tcp_recovery",
1008                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1009                 .maxlen         = sizeof(int),
1010                 .mode           = 0644,
1011                 .proc_handler   = proc_dointvec,
1012         },
1013         {
1014                 .procname       = "tcp_thin_linear_timeouts",
1015                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1016                 .maxlen         = sizeof(int),
1017                 .mode           = 0644,
1018                 .proc_handler   = proc_dointvec
1019         },
1020         {
1021                 .procname       = "tcp_slow_start_after_idle",
1022                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1023                 .maxlen         = sizeof(int),
1024                 .mode           = 0644,
1025                 .proc_handler   = proc_dointvec
1026         },
1027         {
1028                 .procname       = "tcp_retrans_collapse",
1029                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1030                 .maxlen         = sizeof(int),
1031                 .mode           = 0644,
1032                 .proc_handler   = proc_dointvec
1033         },
1034         {
1035                 .procname       = "tcp_stdurg",
1036                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1037                 .maxlen         = sizeof(int),
1038                 .mode           = 0644,
1039                 .proc_handler   = proc_dointvec
1040         },
1041         {
1042                 .procname       = "tcp_rfc1337",
1043                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1044                 .maxlen         = sizeof(int),
1045                 .mode           = 0644,
1046                 .proc_handler   = proc_dointvec
1047         },
1048         {
1049                 .procname       = "tcp_abort_on_overflow",
1050                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1051                 .maxlen         = sizeof(int),
1052                 .mode           = 0644,
1053                 .proc_handler   = proc_dointvec
1054         },
1055         {
1056                 .procname       = "tcp_fack",
1057                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1058                 .maxlen         = sizeof(int),
1059                 .mode           = 0644,
1060                 .proc_handler   = proc_dointvec
1061         },
1062         {
1063                 .procname       = "tcp_max_reordering",
1064                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1065                 .maxlen         = sizeof(int),
1066                 .mode           = 0644,
1067                 .proc_handler   = proc_dointvec
1068         },
1069         {
1070                 .procname       = "tcp_dsack",
1071                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1072                 .maxlen         = sizeof(int),
1073                 .mode           = 0644,
1074                 .proc_handler   = proc_dointvec
1075         },
1076         {
1077                 .procname       = "tcp_app_win",
1078                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1079                 .maxlen         = sizeof(int),
1080                 .mode           = 0644,
1081                 .proc_handler   = proc_dointvec
1082         },
1083         {
1084                 .procname       = "tcp_adv_win_scale",
1085                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1086                 .maxlen         = sizeof(int),
1087                 .mode           = 0644,
1088                 .proc_handler   = proc_dointvec_minmax,
1089                 .extra1         = &tcp_adv_win_scale_min,
1090                 .extra2         = &tcp_adv_win_scale_max,
1091         },
1092         {
1093                 .procname       = "tcp_frto",
1094                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1095                 .maxlen         = sizeof(int),
1096                 .mode           = 0644,
1097                 .proc_handler   = proc_dointvec
1098         },
1099         {
1100                 .procname       = "tcp_no_metrics_save",
1101                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1102                 .maxlen         = sizeof(int),
1103                 .mode           = 0644,
1104                 .proc_handler   = proc_dointvec,
1105         },
1106         {
1107                 .procname       = "tcp_moderate_rcvbuf",
1108                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1109                 .maxlen         = sizeof(int),
1110                 .mode           = 0644,
1111                 .proc_handler   = proc_dointvec,
1112         },
1113         {
1114                 .procname       = "tcp_tso_win_divisor",
1115                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1116                 .maxlen         = sizeof(int),
1117                 .mode           = 0644,
1118                 .proc_handler   = proc_dointvec,
1119         },
1120         {
1121                 .procname       = "tcp_workaround_signed_windows",
1122                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1123                 .maxlen         = sizeof(int),
1124                 .mode           = 0644,
1125                 .proc_handler   = proc_dointvec
1126         },
1127         {
1128                 .procname       = "tcp_limit_output_bytes",
1129                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1130                 .maxlen         = sizeof(int),
1131                 .mode           = 0644,
1132                 .proc_handler   = proc_dointvec
1133         },
1134         {
1135                 .procname       = "tcp_challenge_ack_limit",
1136                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1137                 .maxlen         = sizeof(int),
1138                 .mode           = 0644,
1139                 .proc_handler   = proc_dointvec
1140         },
1141         {
1142                 .procname       = "tcp_min_tso_segs",
1143                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1144                 .maxlen         = sizeof(int),
1145                 .mode           = 0644,
1146                 .proc_handler   = proc_dointvec_minmax,
1147                 .extra1         = &one,
1148                 .extra2         = &gso_max_segs,
1149         },
1150         {
1151                 .procname       = "tcp_min_rtt_wlen",
1152                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1153                 .maxlen         = sizeof(int),
1154                 .mode           = 0644,
1155                 .proc_handler   = proc_dointvec_minmax,
1156                 .extra1         = &zero,
1157                 .extra2         = &one_day_secs
1158         },
1159         {
1160                 .procname       = "tcp_autocorking",
1161                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1162                 .maxlen         = sizeof(int),
1163                 .mode           = 0644,
1164                 .proc_handler   = proc_dointvec_minmax,
1165                 .extra1         = &zero,
1166                 .extra2         = &one,
1167         },
1168         {
1169                 .procname       = "tcp_invalid_ratelimit",
1170                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1171                 .maxlen         = sizeof(int),
1172                 .mode           = 0644,
1173                 .proc_handler   = proc_dointvec_ms_jiffies,
1174         },
1175         {
1176                 .procname       = "tcp_pacing_ss_ratio",
1177                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1178                 .maxlen         = sizeof(int),
1179                 .mode           = 0644,
1180                 .proc_handler   = proc_dointvec_minmax,
1181                 .extra1         = &zero,
1182                 .extra2         = &thousand,
1183         },
1184         {
1185                 .procname       = "tcp_pacing_ca_ratio",
1186                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_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_wmem",
1195                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1196                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1197                 .mode           = 0644,
1198                 .proc_handler   = proc_dointvec_minmax,
1199                 .extra1         = &one,
1200         },
1201         {
1202                 .procname       = "tcp_rmem",
1203                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1204                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1205                 .mode           = 0644,
1206                 .proc_handler   = proc_dointvec_minmax,
1207                 .extra1         = &one,
1208         },
1209         {
1210                 .procname       = "tcp_comp_sack_delay_ns",
1211                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1212                 .maxlen         = sizeof(unsigned long),
1213                 .mode           = 0644,
1214                 .proc_handler   = proc_doulongvec_minmax,
1215         },
1216         {
1217                 .procname       = "tcp_comp_sack_nr",
1218                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1219                 .maxlen         = sizeof(int),
1220                 .mode           = 0644,
1221                 .proc_handler   = proc_dointvec_minmax,
1222                 .extra1         = &zero,
1223                 .extra2         = &comp_sack_nr_max,
1224         },
1225         {
1226                 .procname       = "udp_rmem_min",
1227                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1228                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1229                 .mode           = 0644,
1230                 .proc_handler   = proc_dointvec_minmax,
1231                 .extra1         = &one
1232         },
1233         {
1234                 .procname       = "udp_wmem_min",
1235                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1236                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1237                 .mode           = 0644,
1238                 .proc_handler   = proc_dointvec_minmax,
1239                 .extra1         = &one
1240         },
1241         { }
1242 };
1243
1244 static __net_init int ipv4_sysctl_init_net(struct net *net)
1245 {
1246         struct ctl_table *table;
1247
1248         table = ipv4_net_table;
1249         if (!net_eq(net, &init_net)) {
1250                 int i;
1251
1252                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1253                 if (!table)
1254                         goto err_alloc;
1255
1256                 /* Update the variables to point into the current struct net */
1257                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1258                         table[i].data += (void *)net - (void *)&init_net;
1259         }
1260
1261         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1262         if (!net->ipv4.ipv4_hdr)
1263                 goto err_reg;
1264
1265         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1266         if (!net->ipv4.sysctl_local_reserved_ports)
1267                 goto err_ports;
1268
1269         return 0;
1270
1271 err_ports:
1272         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1273 err_reg:
1274         if (!net_eq(net, &init_net))
1275                 kfree(table);
1276 err_alloc:
1277         return -ENOMEM;
1278 }
1279
1280 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1281 {
1282         struct ctl_table *table;
1283
1284         kfree(net->ipv4.sysctl_local_reserved_ports);
1285         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1286         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1287         kfree(table);
1288 }
1289
1290 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1291         .init = ipv4_sysctl_init_net,
1292         .exit = ipv4_sysctl_exit_net,
1293 };
1294
1295 static __init int sysctl_ipv4_init(void)
1296 {
1297         struct ctl_table_header *hdr;
1298
1299         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1300         if (!hdr)
1301                 return -ENOMEM;
1302
1303         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1304                 unregister_net_sysctl_table(hdr);
1305                 return -ENOMEM;
1306         }
1307
1308         return 0;
1309 }
1310
1311 __initcall(sysctl_ipv4_init);