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
  53 /* obsolete */
  54 static int sysctl_tcp_low_latency __read_mostly;
  55
  56 /* Update system visible IP port range */
  57 static void set_local_port_range(struct net *net, int range[2])
  58 {
  59         bool same_parity = !((range[0] ^ range[1]) & 1);
  60
  61         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  62         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  63                 net->ipv4.ip_local_ports.warned = true;
  64                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  65         }
  66         net->ipv4.ip_local_ports.range[0] = range[0];
  67         net->ipv4.ip_local_ports.range[1] = range[1];
  68         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  69 }
  70
  71 /* Validate changes from /proc interface. */
  72 static int ipv4_local_port_range(struct ctl_table *table, int write,
  73                                  void __user *buffer,
  74                                  size_t *lenp, loff_t *ppos)
  75 {
  76         struct net *net =
  77                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  78         int ret;
  79         int range[2];
  80         struct ctl_table tmp = {
  81                 .data = &range,
  82                 .maxlen = sizeof(range),
  83                 .mode = table->mode,
  84                 .extra1 = &ip_local_port_range_min,
  85                 .extra2 = &ip_local_port_range_max,
  86         };
  87
  88         inet_get_local_port_range(net, &range[0], &range[1]);
  89
  90         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  91
  92         if (write && ret == 0) {
  93                 /* Ensure that the upper limit is not smaller than the lower,
  94                  * and that the lower does not encroach upon the privileged
  95                  * port limit.
  96                  */
  97                 if ((range[1] < range[0]) ||
  98                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
  99                         ret = -EINVAL;
 100                 else
 101                         set_local_port_range(net, range);
 102         }
 103
 104         return ret;
 105 }
 106
 107 /* Validate changes from /proc interface. */
 108 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 109                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 110 {
 111         struct net *net = container_of(table->data, struct net,
 112             ipv4.sysctl_ip_prot_sock);
 113         int ret;
 114         int pports;
 115         int range[2];
 116         struct ctl_table tmp = {
 117                 .data = &pports,
 118                 .maxlen = sizeof(pports),
 119                 .mode = table->mode,
 120                 .extra1 = &ip_privileged_port_min,
 121                 .extra2 = &ip_privileged_port_max,
 122         };
 123
 124         pports = net->ipv4.sysctl_ip_prot_sock;
 125
 126         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 127
 128         if (write && ret == 0) {
 129                 inet_get_local_port_range(net, &range[0], &range[1]);
 130                 /* Ensure that the local port range doesn't overlap with the
 131                  * privileged port range.
 132                  */
 133                 if (range[0] < pports)
 134                         ret = -EINVAL;
 135                 else
 136                         net->ipv4.sysctl_ip_prot_sock = pports;
 137         }
 138
 139         return ret;
 140 }
 141
 142 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 143 {
 144         kgid_t *data = table->data;
 145         struct net *net =
 146                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 147         unsigned int seq;
 148         do {
 149                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 150
 151                 *low = data[0];
 152                 *high = data[1];
 153         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 154 }
 155
 156 /* Update system visible IP port range */
 157 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 158 {
 159         kgid_t *data = table->data;
 160         struct net *net =
 161                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 162         write_seqlock(&net->ipv4.ping_group_range.lock);
 163         data[0] = low;
 164         data[1] = high;
 165         write_sequnlock(&net->ipv4.ping_group_range.lock);
 166 }
 167
 168 /* Validate changes from /proc interface. */
 169 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 170                                  void __user *buffer,
 171                                  size_t *lenp, loff_t *ppos)
 172 {
 173         struct user_namespace *user_ns = current_user_ns();
 174         int ret;
 175         gid_t urange[2];
 176         kgid_t low, high;
 177         struct ctl_table tmp = {
 178                 .data = &urange,
 179                 .maxlen = sizeof(urange),
 180                 .mode = table->mode,
 181                 .extra1 = &ip_ping_group_range_min,
 182                 .extra2 = &ip_ping_group_range_max,
 183         };
 184
 185         inet_get_ping_group_range_table(table, &low, &high);
 186         urange[0] = from_kgid_munged(user_ns, low);
 187         urange[1] = from_kgid_munged(user_ns, high);
 188         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 189
 190         if (write && ret == 0) {
 191                 low = make_kgid(user_ns, urange[0]);
 192                 high = make_kgid(user_ns, urange[1]);
 193                 if (!gid_valid(low) || !gid_valid(high))
 194                         return -EINVAL;
 195                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 196                         low = make_kgid(&init_user_ns, 1);
 197                         high = make_kgid(&init_user_ns, 0);
 198                 }
 199                 set_ping_group_range(table, low, high);
 200         }
 201
 202         return ret;
 203 }
 204
 205 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 206                                     void __user *buffer,
 207                                     size_t *lenp, loff_t *ppos)
 208 {
 209         struct net *net;
 210         int ret;
 211
 212         net = container_of(table->data, struct net,
 213                            ipv4.sysctl_ip_fwd_update_priority);
 214         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 215         if (write && ret == 0)
 216                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 217                                         net);
 218
 219         return ret;
 220 }
 221
 222 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 223                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 224 {
 225         struct net *net = container_of(ctl->data, struct net,
 226                                        ipv4.tcp_congestion_control);
 227         char val[TCP_CA_NAME_MAX];
 228         struct ctl_table tbl = {
 229                 .data = val,
 230                 .maxlen = TCP_CA_NAME_MAX,
 231         };
 232         int ret;
 233
 234         tcp_get_default_congestion_control(net, val);
 235
 236         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 237         if (write && ret == 0)
 238                 ret = tcp_set_default_congestion_control(net, val);
 239         return ret;
 240 }
 241
 242 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 243                                                  int write,
 244                                                  void __user *buffer, size_t *lenp,
 245                                                  loff_t *ppos)
 246 {
 247         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 248         int ret;
 249
 250         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 251         if (!tbl.data)
 252                 return -ENOMEM;
 253         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 254         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 255         kfree(tbl.data);
 256         return ret;
 257 }
 258
 259 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 260                                            int write,
 261                                            void __user *buffer, size_t *lenp,
 262                                            loff_t *ppos)
 263 {
 264         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 265         int ret;
 266
 267         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 268         if (!tbl.data)
 269                 return -ENOMEM;
 270
 271         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 272         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 273         if (write && ret == 0)
 274                 ret = tcp_set_allowed_congestion_control(tbl.data);
 275         kfree(tbl.data);
 276         return ret;
 277 }
 278
 279 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 280                                  void __user *buffer, size_t *lenp,
 281                                  loff_t *ppos)
 282 {
 283         struct net *net = container_of(table->data, struct net,
 284             ipv4.sysctl_tcp_fastopen);
 285         struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
 286         struct tcp_fastopen_context *ctxt;
 287         u32  user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
 288         __le32 key[4];
 289         int ret, i;
 290
 291         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 292         if (!tbl.data)
 293                 return -ENOMEM;
 294
 295         rcu_read_lock();
 296         ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 297         if (ctxt)
 298                 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
 299         else
 300                 memset(key, 0, sizeof(key));
 301         rcu_read_unlock();
 302
 303         for (i = 0; i < ARRAY_SIZE(key); i++)
 304                 user_key[i] = le32_to_cpu(key[i]);
 305
 306         snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
 307                 user_key[0], user_key[1], user_key[2], user_key[3]);
 308         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 309
 310         if (write && ret == 0) {
 311                 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
 312                            user_key + 2, user_key + 3) != 4) {
 313                         ret = -EINVAL;
 314                         goto bad_key;
 315                 }
 316
 317                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 318                         key[i] = cpu_to_le32(user_key[i]);
 319
 320                 tcp_fastopen_reset_cipher(net, NULL, key,
 321                                           TCP_FASTOPEN_KEY_LENGTH);
 322         }
 323
 324 bad_key:
 325         pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 326                 user_key[0], user_key[1], user_key[2], user_key[3],
 327                (char *)tbl.data, ret);
 328         kfree(tbl.data);
 329         return ret;
 330 }
 331
 332 static void proc_configure_early_demux(int enabled, int protocol)
 333 {
 334         struct net_protocol *ipprot;
 335 #if IS_ENABLED(CONFIG_IPV6)
 336         struct inet6_protocol *ip6prot;
 337 #endif
 338
 339         rcu_read_lock();
 340
 341         ipprot = rcu_dereference(inet_protos[protocol]);
 342         if (ipprot)
 343                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 344                                                 NULL;
 345
 346 #if IS_ENABLED(CONFIG_IPV6)
 347         ip6prot = rcu_dereference(inet6_protos[protocol]);
 348         if (ip6prot)
 349                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 350                                                  NULL;
 351 #endif
 352         rcu_read_unlock();
 353 }
 354
 355 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 356                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 357 {
 358         int ret = 0;
 359
 360         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 361
 362         if (write && !ret) {
 363                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 364
 365                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 366         }
 367
 368         return ret;
 369 }
 370
 371 static int proc_udp_early_demux(struct ctl_table *table, int write,
 372                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 373 {
 374         int ret = 0;
 375
 376         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 377
 378         if (write && !ret) {
 379                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 380
 381                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 382         }
 383
 384         return ret;
 385 }
 386
 387 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 388                                              int write,
 389                                              void __user *buffer,
 390                                              size_t *lenp, loff_t *ppos)
 391 {
 392         struct net *net = container_of(table->data, struct net,
 393             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 394         int ret;
 395
 396         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 397         if (write && ret == 0)
 398                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 399
 400         return ret;
 401 }
 402
 403 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 404                                   int write,
 405                                   void __user *buffer, size_t *lenp,
 406                                   loff_t *ppos)
 407 {
 408         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 409         int ret;
 410
 411         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 412         if (!tbl.data)
 413                 return -ENOMEM;
 414         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 415         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 416         kfree(tbl.data);
 417
 418         return ret;
 419 }
 420
 421 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 422 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 423                                           void __user *buffer, size_t *lenp,
 424                                           loff_t *ppos)
 425 {
 426         struct net *net = container_of(table->data, struct net,
 427             ipv4.sysctl_fib_multipath_hash_policy);
 428         int ret;
 429
 430         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 431         if (write && ret == 0)
 432                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 433
 434         return ret;
 435 }
 436 #endif
 437
 438 static struct ctl_table ipv4_table[] = {
 439         {
 440                 .procname       = "tcp_max_orphans",
 441                 .data           = &sysctl_tcp_max_orphans,
 442                 .maxlen         = sizeof(int),
 443                 .mode           = 0644,
 444                 .proc_handler   = proc_dointvec
 445         },
 446         {
 447                 .procname       = "inet_peer_threshold",
 448                 .data           = &inet_peer_threshold,
 449                 .maxlen         = sizeof(int),
 450                 .mode           = 0644,
 451                 .proc_handler   = proc_dointvec
 452         },
 453         {
 454                 .procname       = "inet_peer_minttl",
 455                 .data           = &inet_peer_minttl,
 456                 .maxlen         = sizeof(int),
 457                 .mode           = 0644,
 458                 .proc_handler   = proc_dointvec_jiffies,
 459         },
 460         {
 461                 .procname       = "inet_peer_maxttl",
 462                 .data           = &inet_peer_maxttl,
 463                 .maxlen         = sizeof(int),
 464                 .mode           = 0644,
 465                 .proc_handler   = proc_dointvec_jiffies,
 466         },
 467         {
 468                 .procname       = "tcp_mem",
 469                 .maxlen         = sizeof(sysctl_tcp_mem),
 470                 .data           = &sysctl_tcp_mem,
 471                 .mode           = 0644,
 472                 .proc_handler   = proc_doulongvec_minmax,
 473         },
 474         {
 475                 .procname       = "tcp_low_latency",
 476                 .data           = &sysctl_tcp_low_latency,
 477                 .maxlen         = sizeof(int),
 478                 .mode           = 0644,
 479                 .proc_handler   = proc_dointvec
 480         },
 481 #ifdef CONFIG_NETLABEL
 482         {
 483                 .procname       = "cipso_cache_enable",
 484                 .data           = &cipso_v4_cache_enabled,
 485                 .maxlen         = sizeof(int),
 486                 .mode           = 0644,
 487                 .proc_handler   = proc_dointvec,
 488         },
 489         {
 490                 .procname       = "cipso_cache_bucket_size",
 491                 .data           = &cipso_v4_cache_bucketsize,
 492                 .maxlen         = sizeof(int),
 493                 .mode           = 0644,
 494                 .proc_handler   = proc_dointvec,
 495         },
 496         {
 497                 .procname       = "cipso_rbm_optfmt",
 498                 .data           = &cipso_v4_rbm_optfmt,
 499                 .maxlen         = sizeof(int),
 500                 .mode           = 0644,
 501                 .proc_handler   = proc_dointvec,
 502         },
 503         {
 504                 .procname       = "cipso_rbm_strictvalid",
 505                 .data           = &cipso_v4_rbm_strictvalid,
 506                 .maxlen         = sizeof(int),
 507                 .mode           = 0644,
 508                 .proc_handler   = proc_dointvec,
 509         },
 510 #endif /* CONFIG_NETLABEL */
 511         {
 512                 .procname       = "tcp_available_congestion_control",
 513                 .maxlen         = TCP_CA_BUF_MAX,
 514                 .mode           = 0444,
 515                 .proc_handler   = proc_tcp_available_congestion_control,
 516         },
 517         {
 518                 .procname       = "tcp_allowed_congestion_control",
 519                 .maxlen         = TCP_CA_BUF_MAX,
 520                 .mode           = 0644,
 521                 .proc_handler   = proc_allowed_congestion_control,
 522         },
 523         {
 524                 .procname       = "tcp_available_ulp",
 525                 .maxlen         = TCP_ULP_BUF_MAX,
 526                 .mode           = 0444,
 527                 .proc_handler   = proc_tcp_available_ulp,
 528         },
 529         {
 530                 .procname       = "icmp_msgs_per_sec",
 531                 .data           = &sysctl_icmp_msgs_per_sec,
 532                 .maxlen         = sizeof(int),
 533                 .mode           = 0644,
 534                 .proc_handler   = proc_dointvec_minmax,
 535                 .extra1         = &zero,
 536         },
 537         {
 538                 .procname       = "icmp_msgs_burst",
 539                 .data           = &sysctl_icmp_msgs_burst,
 540                 .maxlen         = sizeof(int),
 541                 .mode           = 0644,
 542                 .proc_handler   = proc_dointvec_minmax,
 543                 .extra1         = &zero,
 544         },
 545         {
 546                 .procname       = "udp_mem",
 547                 .data           = &sysctl_udp_mem,
 548                 .maxlen         = sizeof(sysctl_udp_mem),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_doulongvec_minmax,
 551         },
 552         { }
 553 };
 554
 555 static struct ctl_table ipv4_net_table[] = {
 556         {
 557                 .procname       = "icmp_echo_ignore_all",
 558                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 559                 .maxlen         = sizeof(int),
 560                 .mode           = 0644,
 561                 .proc_handler   = proc_dointvec
 562         },
 563         {
 564                 .procname       = "icmp_echo_ignore_broadcasts",
 565                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 566                 .maxlen         = sizeof(int),
 567                 .mode           = 0644,
 568                 .proc_handler   = proc_dointvec
 569         },
 570         {
 571                 .procname       = "icmp_ignore_bogus_error_responses",
 572                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 573                 .maxlen         = sizeof(int),
 574                 .mode           = 0644,
 575                 .proc_handler   = proc_dointvec
 576         },
 577         {
 578                 .procname       = "icmp_errors_use_inbound_ifaddr",
 579                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 580                 .maxlen         = sizeof(int),
 581                 .mode           = 0644,
 582                 .proc_handler   = proc_dointvec
 583         },
 584         {
 585                 .procname       = "icmp_ratelimit",
 586                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 587                 .maxlen         = sizeof(int),
 588                 .mode           = 0644,
 589                 .proc_handler   = proc_dointvec_ms_jiffies,
 590         },
 591         {
 592                 .procname       = "icmp_ratemask",
 593                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 594                 .maxlen         = sizeof(int),
 595                 .mode           = 0644,
 596                 .proc_handler   = proc_dointvec
 597         },
 598         {
 599                 .procname       = "ping_group_range",
 600                 .data           = &init_net.ipv4.ping_group_range.range,
 601                 .maxlen         = sizeof(gid_t)*2,
 602                 .mode           = 0644,
 603                 .proc_handler   = ipv4_ping_group_range,
 604         },
 605 #ifdef CONFIG_NET_L3_MASTER_DEV
 606         {
 607                 .procname       = "raw_l3mdev_accept",
 608                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 609                 .maxlen         = sizeof(int),
 610                 .mode           = 0644,
 611                 .proc_handler   = proc_dointvec_minmax,
 612                 .extra1         = &zero,
 613                 .extra2         = &one,
 614         },
 615 #endif
 616         {
 617                 .procname       = "tcp_ecn",
 618                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 619                 .maxlen         = sizeof(int),
 620                 .mode           = 0644,
 621                 .proc_handler   = proc_dointvec
 622         },
 623         {
 624                 .procname       = "tcp_ecn_fallback",
 625                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 626                 .maxlen         = sizeof(int),
 627                 .mode           = 0644,
 628                 .proc_handler   = proc_dointvec
 629         },
 630         {
 631                 .procname       = "ip_dynaddr",
 632                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = proc_dointvec
 636         },
 637         {
 638                 .procname       = "ip_early_demux",
 639                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = proc_dointvec
 643         },
 644         {
 645                 .procname       = "udp_early_demux",
 646                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 647                 .maxlen         = sizeof(int),
 648                 .mode           = 0644,
 649                 .proc_handler   = proc_udp_early_demux
 650         },
 651         {
 652                 .procname       = "tcp_early_demux",
 653                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 654                 .maxlen         = sizeof(int),
 655                 .mode           = 0644,
 656                 .proc_handler   = proc_tcp_early_demux
 657         },
 658         {
 659                 .procname       = "ip_default_ttl",
 660                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 661                 .maxlen         = sizeof(int),
 662                 .mode           = 0644,
 663                 .proc_handler   = proc_dointvec_minmax,
 664                 .extra1         = &ip_ttl_min,
 665                 .extra2         = &ip_ttl_max,
 666         },
 667         {
 668                 .procname       = "ip_local_port_range",
 669                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 670                 .data           = &init_net.ipv4.ip_local_ports.range,
 671                 .mode           = 0644,
 672                 .proc_handler   = ipv4_local_port_range,
 673         },
 674         {
 675                 .procname       = "ip_local_reserved_ports",
 676                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 677                 .maxlen         = 65536,
 678                 .mode           = 0644,
 679                 .proc_handler   = proc_do_large_bitmap,
 680         },
 681         {
 682                 .procname       = "ip_no_pmtu_disc",
 683                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 684                 .maxlen         = sizeof(int),
 685                 .mode           = 0644,
 686                 .proc_handler   = proc_dointvec
 687         },
 688         {
 689                 .procname       = "ip_forward_use_pmtu",
 690                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 691                 .maxlen         = sizeof(int),
 692                 .mode           = 0644,
 693                 .proc_handler   = proc_dointvec,
 694         },
 695         {
 696                 .procname       = "ip_forward_update_priority",
 697                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 698                 .maxlen         = sizeof(int),
 699                 .mode           = 0644,
 700                 .proc_handler   = ipv4_fwd_update_priority,
 701                 .extra1         = &zero,
 702                 .extra2         = &one,
 703         },
 704         {
 705                 .procname       = "ip_nonlocal_bind",
 706                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 707                 .maxlen         = sizeof(int),
 708                 .mode           = 0644,
 709                 .proc_handler   = proc_dointvec
 710         },
 711         {
 712                 .procname       = "fwmark_reflect",
 713                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 714                 .maxlen         = sizeof(int),
 715                 .mode           = 0644,
 716                 .proc_handler   = proc_dointvec,
 717         },
 718         {
 719                 .procname       = "tcp_fwmark_accept",
 720                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 721                 .maxlen         = sizeof(int),
 722                 .mode           = 0644,
 723                 .proc_handler   = proc_dointvec,
 724         },
 725 #ifdef CONFIG_NET_L3_MASTER_DEV
 726         {
 727                 .procname       = "tcp_l3mdev_accept",
 728                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 729                 .maxlen         = sizeof(int),
 730                 .mode           = 0644,
 731                 .proc_handler   = proc_dointvec_minmax,
 732                 .extra1         = &zero,
 733                 .extra2         = &one,
 734         },
 735 #endif
 736         {
 737                 .procname       = "tcp_mtu_probing",
 738                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 739                 .maxlen         = sizeof(int),
 740                 .mode           = 0644,
 741                 .proc_handler   = proc_dointvec,
 742         },
 743         {
 744                 .procname       = "tcp_base_mss",
 745                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 746                 .maxlen         = sizeof(int),
 747                 .mode           = 0644,
 748                 .proc_handler   = proc_dointvec,
 749         },
 750         {
 751                 .procname       = "tcp_probe_threshold",
 752                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 753                 .maxlen         = sizeof(int),
 754                 .mode           = 0644,
 755                 .proc_handler   = proc_dointvec,
 756         },
 757         {
 758                 .procname       = "tcp_probe_interval",
 759                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 760                 .maxlen         = sizeof(u32),
 761                 .mode           = 0644,
 762                 .proc_handler   = proc_douintvec_minmax,
 763                 .extra2         = &u32_max_div_HZ,
 764         },
 765         {
 766                 .procname       = "igmp_link_local_mcast_reports",
 767                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 768                 .maxlen         = sizeof(int),
 769                 .mode           = 0644,
 770                 .proc_handler   = proc_dointvec
 771         },
 772         {
 773                 .procname       = "igmp_max_memberships",
 774                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 775                 .maxlen         = sizeof(int),
 776                 .mode           = 0644,
 777                 .proc_handler   = proc_dointvec
 778         },
 779         {
 780                 .procname       = "igmp_max_msf",
 781                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 782                 .maxlen         = sizeof(int),
 783                 .mode           = 0644,
 784                 .proc_handler   = proc_dointvec
 785         },
 786 #ifdef CONFIG_IP_MULTICAST
 787         {
 788                 .procname       = "igmp_qrv",
 789                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 790                 .maxlen         = sizeof(int),
 791                 .mode           = 0644,
 792                 .proc_handler   = proc_dointvec_minmax,
 793                 .extra1         = &one
 794         },
 795 #endif
 796         {
 797                 .procname       = "tcp_congestion_control",
 798                 .data           = &init_net.ipv4.tcp_congestion_control,
 799                 .mode           = 0644,
 800                 .maxlen         = TCP_CA_NAME_MAX,
 801                 .proc_handler   = proc_tcp_congestion_control,
 802         },
 803         {
 804                 .procname       = "tcp_keepalive_time",
 805                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 806                 .maxlen         = sizeof(int),
 807                 .mode           = 0644,
 808                 .proc_handler   = proc_dointvec_jiffies,
 809         },
 810         {
 811                 .procname       = "tcp_keepalive_probes",
 812                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 813                 .maxlen         = sizeof(int),
 814                 .mode           = 0644,
 815                 .proc_handler   = proc_dointvec
 816         },
 817         {
 818                 .procname       = "tcp_keepalive_intvl",
 819                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 820                 .maxlen         = sizeof(int),
 821                 .mode           = 0644,
 822                 .proc_handler   = proc_dointvec_jiffies,
 823         },
 824         {
 825                 .procname       = "tcp_syn_retries",
 826                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = proc_dointvec_minmax,
 830                 .extra1         = &tcp_syn_retries_min,
 831                 .extra2         = &tcp_syn_retries_max
 832         },
 833         {
 834                 .procname       = "tcp_synack_retries",
 835                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 836                 .maxlen         = sizeof(int),
 837                 .mode           = 0644,
 838                 .proc_handler   = proc_dointvec
 839         },
 840 #ifdef CONFIG_SYN_COOKIES
 841         {
 842                 .procname       = "tcp_syncookies",
 843                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 844                 .maxlen         = sizeof(int),
 845                 .mode           = 0644,
 846                 .proc_handler   = proc_dointvec
 847         },
 848 #endif
 849         {
 850                 .procname       = "tcp_reordering",
 851                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 852                 .maxlen         = sizeof(int),
 853                 .mode           = 0644,
 854                 .proc_handler   = proc_dointvec
 855         },
 856         {
 857                 .procname       = "tcp_retries1",
 858                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 859                 .maxlen         = sizeof(int),
 860                 .mode           = 0644,
 861                 .proc_handler   = proc_dointvec_minmax,
 862                 .extra2         = &tcp_retr1_max
 863         },
 864         {
 865                 .procname       = "tcp_retries2",
 866                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 867                 .maxlen         = sizeof(int),
 868                 .mode           = 0644,
 869                 .proc_handler   = proc_dointvec
 870         },
 871         {
 872                 .procname       = "tcp_orphan_retries",
 873                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 874                 .maxlen         = sizeof(int),
 875                 .mode           = 0644,
 876                 .proc_handler   = proc_dointvec
 877         },
 878         {
 879                 .procname       = "tcp_fin_timeout",
 880                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 881                 .maxlen         = sizeof(int),
 882                 .mode           = 0644,
 883                 .proc_handler   = proc_dointvec_jiffies,
 884         },
 885         {
 886                 .procname       = "tcp_notsent_lowat",
 887                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 888                 .maxlen         = sizeof(unsigned int),
 889                 .mode           = 0644,
 890                 .proc_handler   = proc_douintvec,
 891         },
 892         {
 893                 .procname       = "tcp_tw_reuse",
 894                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 895                 .maxlen         = sizeof(int),
 896                 .mode           = 0644,
 897                 .proc_handler   = proc_dointvec_minmax,
 898                 .extra1         = &zero,
 899                 .extra2         = &two,
 900         },
 901         {
 902                 .procname       = "tcp_max_tw_buckets",
 903                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 904                 .maxlen         = sizeof(int),
 905                 .mode           = 0644,
 906                 .proc_handler   = proc_dointvec
 907         },
 908         {
 909                 .procname       = "tcp_max_syn_backlog",
 910                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 911                 .maxlen         = sizeof(int),
 912                 .mode           = 0644,
 913                 .proc_handler   = proc_dointvec
 914         },
 915         {
 916                 .procname       = "tcp_fastopen",
 917                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 918                 .maxlen         = sizeof(int),
 919                 .mode           = 0644,
 920                 .proc_handler   = proc_dointvec,
 921         },
 922         {
 923                 .procname       = "tcp_fastopen_key",
 924                 .mode           = 0600,
 925                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 926                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 927                 .proc_handler   = proc_tcp_fastopen_key,
 928         },
 929         {
 930                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
 931                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
 932                 .maxlen         = sizeof(int),
 933                 .mode           = 0644,
 934                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
 935                 .extra1         = &zero,
 936         },
 937 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 938         {
 939                 .procname       = "fib_multipath_use_neigh",
 940                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
 941                 .maxlen         = sizeof(int),
 942                 .mode           = 0644,
 943                 .proc_handler   = proc_dointvec_minmax,
 944                 .extra1         = &zero,
 945                 .extra2         = &one,
 946         },
 947         {
 948                 .procname       = "fib_multipath_hash_policy",
 949                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
 950                 .maxlen         = sizeof(int),
 951                 .mode           = 0644,
 952                 .proc_handler   = proc_fib_multipath_hash_policy,
 953                 .extra1         = &zero,
 954                 .extra2         = &one,
 955         },
 956 #endif
 957         {
 958                 .procname       = "ip_unprivileged_port_start",
 959                 .maxlen         = sizeof(int),
 960                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
 961                 .mode           = 0644,
 962                 .proc_handler   = ipv4_privileged_ports,
 963         },
 964 #ifdef CONFIG_NET_L3_MASTER_DEV
 965         {
 966                 .procname       = "udp_l3mdev_accept",
 967                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
 968                 .maxlen         = sizeof(int),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_dointvec_minmax,
 971                 .extra1         = &zero,
 972                 .extra2         = &one,
 973         },
 974 #endif
 975         {
 976                 .procname       = "tcp_sack",
 977                 .data           = &init_net.ipv4.sysctl_tcp_sack,
 978                 .maxlen         = sizeof(int),
 979                 .mode           = 0644,
 980                 .proc_handler   = proc_dointvec
 981         },
 982         {
 983                 .procname       = "tcp_window_scaling",
 984                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
 985                 .maxlen         = sizeof(int),
 986                 .mode           = 0644,
 987                 .proc_handler   = proc_dointvec
 988         },
 989         {
 990                 .procname       = "tcp_timestamps",
 991                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
 992                 .maxlen         = sizeof(int),
 993                 .mode           = 0644,
 994                 .proc_handler   = proc_dointvec
 995         },
 996         {
 997                 .procname       = "tcp_early_retrans",
 998                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
 999                 .maxlen         = sizeof(int),
1000                 .mode           = 0644,
1001                 .proc_handler   = proc_dointvec_minmax,
1002                 .extra1         = &zero,
1003                 .extra2         = &four,
1004         },
1005         {
1006                 .procname       = "tcp_recovery",
1007                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1008                 .maxlen         = sizeof(int),
1009                 .mode           = 0644,
1010                 .proc_handler   = proc_dointvec,
1011         },
1012         {
1013                 .procname       = "tcp_thin_linear_timeouts",
1014                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1015                 .maxlen         = sizeof(int),
1016                 .mode           = 0644,
1017                 .proc_handler   = proc_dointvec
1018         },
1019         {
1020                 .procname       = "tcp_slow_start_after_idle",
1021                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1022                 .maxlen         = sizeof(int),
1023                 .mode           = 0644,
1024                 .proc_handler   = proc_dointvec
1025         },
1026         {
1027                 .procname       = "tcp_retrans_collapse",
1028                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1029                 .maxlen         = sizeof(int),
1030                 .mode           = 0644,
1031                 .proc_handler   = proc_dointvec
1032         },
1033         {
1034                 .procname       = "tcp_stdurg",
1035                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1036                 .maxlen         = sizeof(int),
1037                 .mode           = 0644,
1038                 .proc_handler   = proc_dointvec
1039         },
1040         {
1041                 .procname       = "tcp_rfc1337",
1042                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1043                 .maxlen         = sizeof(int),
1044                 .mode           = 0644,
1045                 .proc_handler   = proc_dointvec
1046         },
1047         {
1048                 .procname       = "tcp_abort_on_overflow",
1049                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1050                 .maxlen         = sizeof(int),
1051                 .mode           = 0644,
1052                 .proc_handler   = proc_dointvec
1053         },
1054         {
1055                 .procname       = "tcp_fack",
1056                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1057                 .maxlen         = sizeof(int),
1058                 .mode           = 0644,
1059                 .proc_handler   = proc_dointvec
1060         },
1061         {
1062                 .procname       = "tcp_max_reordering",
1063                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1064                 .maxlen         = sizeof(int),
1065                 .mode           = 0644,
1066                 .proc_handler   = proc_dointvec
1067         },
1068         {
1069                 .procname       = "tcp_dsack",
1070                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1071                 .maxlen         = sizeof(int),
1072                 .mode           = 0644,
1073                 .proc_handler   = proc_dointvec
1074         },
1075         {
1076                 .procname       = "tcp_app_win",
1077                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1078                 .maxlen         = sizeof(int),
1079                 .mode           = 0644,
1080                 .proc_handler   = proc_dointvec
1081         },
1082         {
1083                 .procname       = "tcp_adv_win_scale",
1084                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1085                 .maxlen         = sizeof(int),
1086                 .mode           = 0644,
1087                 .proc_handler   = proc_dointvec_minmax,
1088                 .extra1         = &tcp_adv_win_scale_min,
1089                 .extra2         = &tcp_adv_win_scale_max,
1090         },
1091         {
1092                 .procname       = "tcp_frto",
1093                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1094                 .maxlen         = sizeof(int),
1095                 .mode           = 0644,
1096                 .proc_handler   = proc_dointvec
1097         },
1098         {
1099                 .procname       = "tcp_no_metrics_save",
1100                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1101                 .maxlen         = sizeof(int),
1102                 .mode           = 0644,
1103                 .proc_handler   = proc_dointvec,
1104         },
1105         {
1106                 .procname       = "tcp_moderate_rcvbuf",
1107                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1108                 .maxlen         = sizeof(int),
1109                 .mode           = 0644,
1110                 .proc_handler   = proc_dointvec,
1111         },
1112         {
1113                 .procname       = "tcp_tso_win_divisor",
1114                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1115                 .maxlen         = sizeof(int),
1116                 .mode           = 0644,
1117                 .proc_handler   = proc_dointvec,
1118         },
1119         {
1120                 .procname       = "tcp_workaround_signed_windows",
1121                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1122                 .maxlen         = sizeof(int),
1123                 .mode           = 0644,
1124                 .proc_handler   = proc_dointvec
1125         },
1126         {
1127                 .procname       = "tcp_limit_output_bytes",
1128                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1129                 .maxlen         = sizeof(int),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dointvec
1132         },
1133         {
1134                 .procname       = "tcp_challenge_ack_limit",
1135                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1136                 .maxlen         = sizeof(int),
1137                 .mode           = 0644,
1138                 .proc_handler   = proc_dointvec
1139         },
1140         {
1141                 .procname       = "tcp_min_tso_segs",
1142                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1143                 .maxlen         = sizeof(int),
1144                 .mode           = 0644,
1145                 .proc_handler   = proc_dointvec_minmax,
1146                 .extra1         = &one,
1147                 .extra2         = &gso_max_segs,
1148         },
1149         {
1150                 .procname       = "tcp_min_rtt_wlen",
1151                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1152                 .maxlen         = sizeof(int),
1153                 .mode           = 0644,
1154                 .proc_handler   = proc_dointvec
1155         },
1156         {
1157                 .procname       = "tcp_autocorking",
1158                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1159                 .maxlen         = sizeof(int),
1160                 .mode           = 0644,
1161                 .proc_handler   = proc_dointvec_minmax,
1162                 .extra1         = &zero,
1163                 .extra2         = &one,
1164         },
1165         {
1166                 .procname       = "tcp_invalid_ratelimit",
1167                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1168                 .maxlen         = sizeof(int),
1169                 .mode           = 0644,
1170                 .proc_handler   = proc_dointvec_ms_jiffies,
1171         },
1172         {
1173                 .procname       = "tcp_pacing_ss_ratio",
1174                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1175                 .maxlen         = sizeof(int),
1176                 .mode           = 0644,
1177                 .proc_handler   = proc_dointvec_minmax,
1178                 .extra1         = &zero,
1179                 .extra2         = &thousand,
1180         },
1181         {
1182                 .procname       = "tcp_pacing_ca_ratio",
1183                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1184                 .maxlen         = sizeof(int),
1185                 .mode           = 0644,
1186                 .proc_handler   = proc_dointvec_minmax,
1187                 .extra1         = &zero,
1188                 .extra2         = &thousand,
1189         },
1190         {
1191                 .procname       = "tcp_wmem",
1192                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1193                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1194                 .mode           = 0644,
1195                 .proc_handler   = proc_dointvec_minmax,
1196                 .extra1         = &one,
1197         },
1198         {
1199                 .procname       = "tcp_rmem",
1200                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1201                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1202                 .mode           = 0644,
1203                 .proc_handler   = proc_dointvec_minmax,
1204                 .extra1         = &one,
1205         },
1206         {
1207                 .procname       = "tcp_comp_sack_delay_ns",
1208                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1209                 .maxlen         = sizeof(unsigned long),
1210                 .mode           = 0644,
1211                 .proc_handler   = proc_doulongvec_minmax,
1212         },
1213         {
1214                 .procname       = "tcp_comp_sack_nr",
1215                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1216                 .maxlen         = sizeof(int),
1217                 .mode           = 0644,
1218                 .proc_handler   = proc_dointvec_minmax,
1219                 .extra1         = &zero,
1220                 .extra2         = &comp_sack_nr_max,
1221         },
1222         {
1223                 .procname       = "udp_rmem_min",
1224                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1225                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1226                 .mode           = 0644,
1227                 .proc_handler   = proc_dointvec_minmax,
1228                 .extra1         = &one
1229         },
1230         {
1231                 .procname       = "udp_wmem_min",
1232                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1233                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1234                 .mode           = 0644,
1235                 .proc_handler   = proc_dointvec_minmax,
1236                 .extra1         = &one
1237         },
1238         { }
1239 };
1240
1241 static __net_init int ipv4_sysctl_init_net(struct net *net)
1242 {
1243         struct ctl_table *table;
1244
1245         table = ipv4_net_table;
1246         if (!net_eq(net, &init_net)) {
1247                 int i;
1248
1249                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1250                 if (!table)
1251                         goto err_alloc;
1252
1253                 /* Update the variables to point into the current struct net */
1254                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1255                         table[i].data += (void *)net - (void *)&init_net;
1256         }
1257
1258         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1259         if (!net->ipv4.ipv4_hdr)
1260                 goto err_reg;
1261
1262         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1263         if (!net->ipv4.sysctl_local_reserved_ports)
1264                 goto err_ports;
1265
1266         return 0;
1267
1268 err_ports:
1269         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1270 err_reg:
1271         if (!net_eq(net, &init_net))
1272                 kfree(table);
1273 err_alloc:
1274         return -ENOMEM;
1275 }
1276
1277 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1278 {
1279         struct ctl_table *table;
1280
1281         kfree(net->ipv4.sysctl_local_reserved_ports);
1282         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1283         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1284         kfree(table);
1285 }
1286
1287 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1288         .init = ipv4_sysctl_init_net,
1289         .exit = ipv4_sysctl_exit_net,
1290 };
1291
1292 static __init int sysctl_ipv4_init(void)
1293 {
1294         struct ctl_table_header *hdr;
1295
1296         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1297         if (!hdr)
1298                 return -ENOMEM;
1299
1300         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1301                 unregister_net_sysctl_table(hdr);
1302                 return -ENOMEM;
1303         }
1304
1305         return 0;
1306 }
1307
1308 __initcall(sysctl_ipv4_init);