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         {
 606                 .procname       = "tcp_ecn",
 607                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = proc_dointvec
 611         },
 612         {
 613                 .procname       = "tcp_ecn_fallback",
 614                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 615                 .maxlen         = sizeof(int),
 616                 .mode           = 0644,
 617                 .proc_handler   = proc_dointvec
 618         },
 619         {
 620                 .procname       = "ip_dynaddr",
 621                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = proc_dointvec
 625         },
 626         {
 627                 .procname       = "ip_early_demux",
 628                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 629                 .maxlen         = sizeof(int),
 630                 .mode           = 0644,
 631                 .proc_handler   = proc_dointvec
 632         },
 633         {
 634                 .procname       = "udp_early_demux",
 635                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 636                 .maxlen         = sizeof(int),
 637                 .mode           = 0644,
 638                 .proc_handler   = proc_udp_early_demux
 639         },
 640         {
 641                 .procname       = "tcp_early_demux",
 642                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 643                 .maxlen         = sizeof(int),
 644                 .mode           = 0644,
 645                 .proc_handler   = proc_tcp_early_demux
 646         },
 647         {
 648                 .procname       = "ip_default_ttl",
 649                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 650                 .maxlen         = sizeof(int),
 651                 .mode           = 0644,
 652                 .proc_handler   = proc_dointvec_minmax,
 653                 .extra1         = &ip_ttl_min,
 654                 .extra2         = &ip_ttl_max,
 655         },
 656         {
 657                 .procname       = "ip_local_port_range",
 658                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 659                 .data           = &init_net.ipv4.ip_local_ports.range,
 660                 .mode           = 0644,
 661                 .proc_handler   = ipv4_local_port_range,
 662         },
 663         {
 664                 .procname       = "ip_local_reserved_ports",
 665                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 666                 .maxlen         = 65536,
 667                 .mode           = 0644,
 668                 .proc_handler   = proc_do_large_bitmap,
 669         },
 670         {
 671                 .procname       = "ip_no_pmtu_disc",
 672                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 673                 .maxlen         = sizeof(int),
 674                 .mode           = 0644,
 675                 .proc_handler   = proc_dointvec
 676         },
 677         {
 678                 .procname       = "ip_forward_use_pmtu",
 679                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 680                 .maxlen         = sizeof(int),
 681                 .mode           = 0644,
 682                 .proc_handler   = proc_dointvec,
 683         },
 684         {
 685                 .procname       = "ip_forward_update_priority",
 686                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 687                 .maxlen         = sizeof(int),
 688                 .mode           = 0644,
 689                 .proc_handler   = ipv4_fwd_update_priority,
 690                 .extra1         = &zero,
 691                 .extra2         = &one,
 692         },
 693         {
 694                 .procname       = "ip_nonlocal_bind",
 695                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 696                 .maxlen         = sizeof(int),
 697                 .mode           = 0644,
 698                 .proc_handler   = proc_dointvec
 699         },
 700         {
 701                 .procname       = "fwmark_reflect",
 702                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 703                 .maxlen         = sizeof(int),
 704                 .mode           = 0644,
 705                 .proc_handler   = proc_dointvec,
 706         },
 707         {
 708                 .procname       = "tcp_fwmark_accept",
 709                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 710                 .maxlen         = sizeof(int),
 711                 .mode           = 0644,
 712                 .proc_handler   = proc_dointvec,
 713         },
 714 #ifdef CONFIG_NET_L3_MASTER_DEV
 715         {
 716                 .procname       = "tcp_l3mdev_accept",
 717                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 718                 .maxlen         = sizeof(int),
 719                 .mode           = 0644,
 720                 .proc_handler   = proc_dointvec_minmax,
 721                 .extra1         = &zero,
 722                 .extra2         = &one,
 723         },
 724 #endif
 725         {
 726                 .procname       = "tcp_mtu_probing",
 727                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 728                 .maxlen         = sizeof(int),
 729                 .mode           = 0644,
 730                 .proc_handler   = proc_dointvec,
 731         },
 732         {
 733                 .procname       = "tcp_base_mss",
 734                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 735                 .maxlen         = sizeof(int),
 736                 .mode           = 0644,
 737                 .proc_handler   = proc_dointvec,
 738         },
 739         {
 740                 .procname       = "tcp_probe_threshold",
 741                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 742                 .maxlen         = sizeof(int),
 743                 .mode           = 0644,
 744                 .proc_handler   = proc_dointvec,
 745         },
 746         {
 747                 .procname       = "tcp_probe_interval",
 748                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 749                 .maxlen         = sizeof(u32),
 750                 .mode           = 0644,
 751                 .proc_handler   = proc_douintvec_minmax,
 752                 .extra2         = &u32_max_div_HZ,
 753         },
 754         {
 755                 .procname       = "igmp_link_local_mcast_reports",
 756                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 757                 .maxlen         = sizeof(int),
 758                 .mode           = 0644,
 759                 .proc_handler   = proc_dointvec
 760         },
 761         {
 762                 .procname       = "igmp_max_memberships",
 763                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 764                 .maxlen         = sizeof(int),
 765                 .mode           = 0644,
 766                 .proc_handler   = proc_dointvec
 767         },
 768         {
 769                 .procname       = "igmp_max_msf",
 770                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 771                 .maxlen         = sizeof(int),
 772                 .mode           = 0644,
 773                 .proc_handler   = proc_dointvec
 774         },
 775 #ifdef CONFIG_IP_MULTICAST
 776         {
 777                 .procname       = "igmp_qrv",
 778                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 779                 .maxlen         = sizeof(int),
 780                 .mode           = 0644,
 781                 .proc_handler   = proc_dointvec_minmax,
 782                 .extra1         = &one
 783         },
 784 #endif
 785         {
 786                 .procname       = "tcp_congestion_control",
 787                 .data           = &init_net.ipv4.tcp_congestion_control,
 788                 .mode           = 0644,
 789                 .maxlen         = TCP_CA_NAME_MAX,
 790                 .proc_handler   = proc_tcp_congestion_control,
 791         },
 792         {
 793                 .procname       = "tcp_keepalive_time",
 794                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 795                 .maxlen         = sizeof(int),
 796                 .mode           = 0644,
 797                 .proc_handler   = proc_dointvec_jiffies,
 798         },
 799         {
 800                 .procname       = "tcp_keepalive_probes",
 801                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 802                 .maxlen         = sizeof(int),
 803                 .mode           = 0644,
 804                 .proc_handler   = proc_dointvec
 805         },
 806         {
 807                 .procname       = "tcp_keepalive_intvl",
 808                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 809                 .maxlen         = sizeof(int),
 810                 .mode           = 0644,
 811                 .proc_handler   = proc_dointvec_jiffies,
 812         },
 813         {
 814                 .procname       = "tcp_syn_retries",
 815                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 816                 .maxlen         = sizeof(int),
 817                 .mode           = 0644,
 818                 .proc_handler   = proc_dointvec_minmax,
 819                 .extra1         = &tcp_syn_retries_min,
 820                 .extra2         = &tcp_syn_retries_max
 821         },
 822         {
 823                 .procname       = "tcp_synack_retries",
 824                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 825                 .maxlen         = sizeof(int),
 826                 .mode           = 0644,
 827                 .proc_handler   = proc_dointvec
 828         },
 829 #ifdef CONFIG_SYN_COOKIES
 830         {
 831                 .procname       = "tcp_syncookies",
 832                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 833                 .maxlen         = sizeof(int),
 834                 .mode           = 0644,
 835                 .proc_handler   = proc_dointvec
 836         },
 837 #endif
 838         {
 839                 .procname       = "tcp_reordering",
 840                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 841                 .maxlen         = sizeof(int),
 842                 .mode           = 0644,
 843                 .proc_handler   = proc_dointvec
 844         },
 845         {
 846                 .procname       = "tcp_retries1",
 847                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 848                 .maxlen         = sizeof(int),
 849                 .mode           = 0644,
 850                 .proc_handler   = proc_dointvec_minmax,
 851                 .extra2         = &tcp_retr1_max
 852         },
 853         {
 854                 .procname       = "tcp_retries2",
 855                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 856                 .maxlen         = sizeof(int),
 857                 .mode           = 0644,
 858                 .proc_handler   = proc_dointvec
 859         },
 860         {
 861                 .procname       = "tcp_orphan_retries",
 862                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 863                 .maxlen         = sizeof(int),
 864                 .mode           = 0644,
 865                 .proc_handler   = proc_dointvec
 866         },
 867         {
 868                 .procname       = "tcp_fin_timeout",
 869                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 870                 .maxlen         = sizeof(int),
 871                 .mode           = 0644,
 872                 .proc_handler   = proc_dointvec_jiffies,
 873         },
 874         {
 875                 .procname       = "tcp_notsent_lowat",
 876                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 877                 .maxlen         = sizeof(unsigned int),
 878                 .mode           = 0644,
 879                 .proc_handler   = proc_douintvec,
 880         },
 881         {
 882                 .procname       = "tcp_tw_reuse",
 883                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 884                 .maxlen         = sizeof(int),
 885                 .mode           = 0644,
 886                 .proc_handler   = proc_dointvec_minmax,
 887                 .extra1         = &zero,
 888                 .extra2         = &two,
 889         },
 890         {
 891                 .procname       = "tcp_max_tw_buckets",
 892                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 893                 .maxlen         = sizeof(int),
 894                 .mode           = 0644,
 895                 .proc_handler   = proc_dointvec
 896         },
 897         {
 898                 .procname       = "tcp_max_syn_backlog",
 899                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 900                 .maxlen         = sizeof(int),
 901                 .mode           = 0644,
 902                 .proc_handler   = proc_dointvec
 903         },
 904         {
 905                 .procname       = "tcp_fastopen",
 906                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 907                 .maxlen         = sizeof(int),
 908                 .mode           = 0644,
 909                 .proc_handler   = proc_dointvec,
 910         },
 911         {
 912                 .procname       = "tcp_fastopen_key",
 913                 .mode           = 0600,
 914                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 915                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 916                 .proc_handler   = proc_tcp_fastopen_key,
 917         },
 918         {
 919                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
 920                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
 921                 .maxlen         = sizeof(int),
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
 924                 .extra1         = &zero,
 925         },
 926 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 927         {
 928                 .procname       = "fib_multipath_use_neigh",
 929                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
 930                 .maxlen         = sizeof(int),
 931                 .mode           = 0644,
 932                 .proc_handler   = proc_dointvec_minmax,
 933                 .extra1         = &zero,
 934                 .extra2         = &one,
 935         },
 936         {
 937                 .procname       = "fib_multipath_hash_policy",
 938                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
 939                 .maxlen         = sizeof(int),
 940                 .mode           = 0644,
 941                 .proc_handler   = proc_fib_multipath_hash_policy,
 942                 .extra1         = &zero,
 943                 .extra2         = &one,
 944         },
 945 #endif
 946         {
 947                 .procname       = "ip_unprivileged_port_start",
 948                 .maxlen         = sizeof(int),
 949                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
 950                 .mode           = 0644,
 951                 .proc_handler   = ipv4_privileged_ports,
 952         },
 953 #ifdef CONFIG_NET_L3_MASTER_DEV
 954         {
 955                 .procname       = "udp_l3mdev_accept",
 956                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
 957                 .maxlen         = sizeof(int),
 958                 .mode           = 0644,
 959                 .proc_handler   = proc_dointvec_minmax,
 960                 .extra1         = &zero,
 961                 .extra2         = &one,
 962         },
 963 #endif
 964         {
 965                 .procname       = "tcp_sack",
 966                 .data           = &init_net.ipv4.sysctl_tcp_sack,
 967                 .maxlen         = sizeof(int),
 968                 .mode           = 0644,
 969                 .proc_handler   = proc_dointvec
 970         },
 971         {
 972                 .procname       = "tcp_window_scaling",
 973                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
 974                 .maxlen         = sizeof(int),
 975                 .mode           = 0644,
 976                 .proc_handler   = proc_dointvec
 977         },
 978         {
 979                 .procname       = "tcp_timestamps",
 980                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
 981                 .maxlen         = sizeof(int),
 982                 .mode           = 0644,
 983                 .proc_handler   = proc_dointvec
 984         },
 985         {
 986                 .procname       = "tcp_early_retrans",
 987                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
 988                 .maxlen         = sizeof(int),
 989                 .mode           = 0644,
 990                 .proc_handler   = proc_dointvec_minmax,
 991                 .extra1         = &zero,
 992                 .extra2         = &four,
 993         },
 994         {
 995                 .procname       = "tcp_recovery",
 996                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
 997                 .maxlen         = sizeof(int),
 998                 .mode           = 0644,
 999                 .proc_handler   = proc_dointvec,
1000         },
1001         {
1002                 .procname       = "tcp_thin_linear_timeouts",
1003                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1004                 .maxlen         = sizeof(int),
1005                 .mode           = 0644,
1006                 .proc_handler   = proc_dointvec
1007         },
1008         {
1009                 .procname       = "tcp_slow_start_after_idle",
1010                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1011                 .maxlen         = sizeof(int),
1012                 .mode           = 0644,
1013                 .proc_handler   = proc_dointvec
1014         },
1015         {
1016                 .procname       = "tcp_retrans_collapse",
1017                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1018                 .maxlen         = sizeof(int),
1019                 .mode           = 0644,
1020                 .proc_handler   = proc_dointvec
1021         },
1022         {
1023                 .procname       = "tcp_stdurg",
1024                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1025                 .maxlen         = sizeof(int),
1026                 .mode           = 0644,
1027                 .proc_handler   = proc_dointvec
1028         },
1029         {
1030                 .procname       = "tcp_rfc1337",
1031                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1032                 .maxlen         = sizeof(int),
1033                 .mode           = 0644,
1034                 .proc_handler   = proc_dointvec
1035         },
1036         {
1037                 .procname       = "tcp_abort_on_overflow",
1038                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1039                 .maxlen         = sizeof(int),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_dointvec
1042         },
1043         {
1044                 .procname       = "tcp_fack",
1045                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1046                 .maxlen         = sizeof(int),
1047                 .mode           = 0644,
1048                 .proc_handler   = proc_dointvec
1049         },
1050         {
1051                 .procname       = "tcp_max_reordering",
1052                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1053                 .maxlen         = sizeof(int),
1054                 .mode           = 0644,
1055                 .proc_handler   = proc_dointvec
1056         },
1057         {
1058                 .procname       = "tcp_dsack",
1059                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1060                 .maxlen         = sizeof(int),
1061                 .mode           = 0644,
1062                 .proc_handler   = proc_dointvec
1063         },
1064         {
1065                 .procname       = "tcp_app_win",
1066                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1067                 .maxlen         = sizeof(int),
1068                 .mode           = 0644,
1069                 .proc_handler   = proc_dointvec
1070         },
1071         {
1072                 .procname       = "tcp_adv_win_scale",
1073                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1074                 .maxlen         = sizeof(int),
1075                 .mode           = 0644,
1076                 .proc_handler   = proc_dointvec_minmax,
1077                 .extra1         = &tcp_adv_win_scale_min,
1078                 .extra2         = &tcp_adv_win_scale_max,
1079         },
1080         {
1081                 .procname       = "tcp_frto",
1082                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1083                 .maxlen         = sizeof(int),
1084                 .mode           = 0644,
1085                 .proc_handler   = proc_dointvec
1086         },
1087         {
1088                 .procname       = "tcp_no_metrics_save",
1089                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1090                 .maxlen         = sizeof(int),
1091                 .mode           = 0644,
1092                 .proc_handler   = proc_dointvec,
1093         },
1094         {
1095                 .procname       = "tcp_moderate_rcvbuf",
1096                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1097                 .maxlen         = sizeof(int),
1098                 .mode           = 0644,
1099                 .proc_handler   = proc_dointvec,
1100         },
1101         {
1102                 .procname       = "tcp_tso_win_divisor",
1103                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1104                 .maxlen         = sizeof(int),
1105                 .mode           = 0644,
1106                 .proc_handler   = proc_dointvec,
1107         },
1108         {
1109                 .procname       = "tcp_workaround_signed_windows",
1110                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1111                 .maxlen         = sizeof(int),
1112                 .mode           = 0644,
1113                 .proc_handler   = proc_dointvec
1114         },
1115         {
1116                 .procname       = "tcp_limit_output_bytes",
1117                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1118                 .maxlen         = sizeof(int),
1119                 .mode           = 0644,
1120                 .proc_handler   = proc_dointvec
1121         },
1122         {
1123                 .procname       = "tcp_challenge_ack_limit",
1124                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1125                 .maxlen         = sizeof(int),
1126                 .mode           = 0644,
1127                 .proc_handler   = proc_dointvec
1128         },
1129         {
1130                 .procname       = "tcp_min_tso_segs",
1131                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1132                 .maxlen         = sizeof(int),
1133                 .mode           = 0644,
1134                 .proc_handler   = proc_dointvec_minmax,
1135                 .extra1         = &one,
1136                 .extra2         = &gso_max_segs,
1137         },
1138         {
1139                 .procname       = "tcp_min_rtt_wlen",
1140                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1141                 .maxlen         = sizeof(int),
1142                 .mode           = 0644,
1143                 .proc_handler   = proc_dointvec
1144         },
1145         {
1146                 .procname       = "tcp_autocorking",
1147                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1148                 .maxlen         = sizeof(int),
1149                 .mode           = 0644,
1150                 .proc_handler   = proc_dointvec_minmax,
1151                 .extra1         = &zero,
1152                 .extra2         = &one,
1153         },
1154         {
1155                 .procname       = "tcp_invalid_ratelimit",
1156                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1157                 .maxlen         = sizeof(int),
1158                 .mode           = 0644,
1159                 .proc_handler   = proc_dointvec_ms_jiffies,
1160         },
1161         {
1162                 .procname       = "tcp_pacing_ss_ratio",
1163                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1164                 .maxlen         = sizeof(int),
1165                 .mode           = 0644,
1166                 .proc_handler   = proc_dointvec_minmax,
1167                 .extra1         = &zero,
1168                 .extra2         = &thousand,
1169         },
1170         {
1171                 .procname       = "tcp_pacing_ca_ratio",
1172                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1173                 .maxlen         = sizeof(int),
1174                 .mode           = 0644,
1175                 .proc_handler   = proc_dointvec_minmax,
1176                 .extra1         = &zero,
1177                 .extra2         = &thousand,
1178         },
1179         {
1180                 .procname       = "tcp_wmem",
1181                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1182                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1183                 .mode           = 0644,
1184                 .proc_handler   = proc_dointvec_minmax,
1185                 .extra1         = &one,
1186         },
1187         {
1188                 .procname       = "tcp_rmem",
1189                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1190                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1191                 .mode           = 0644,
1192                 .proc_handler   = proc_dointvec_minmax,
1193                 .extra1         = &one,
1194         },
1195         {
1196                 .procname       = "tcp_comp_sack_delay_ns",
1197                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1198                 .maxlen         = sizeof(unsigned long),
1199                 .mode           = 0644,
1200                 .proc_handler   = proc_doulongvec_minmax,
1201         },
1202         {
1203                 .procname       = "tcp_comp_sack_nr",
1204                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1205                 .maxlen         = sizeof(int),
1206                 .mode           = 0644,
1207                 .proc_handler   = proc_dointvec_minmax,
1208                 .extra1         = &zero,
1209                 .extra2         = &comp_sack_nr_max,
1210         },
1211         {
1212                 .procname       = "udp_rmem_min",
1213                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1214                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1215                 .mode           = 0644,
1216                 .proc_handler   = proc_dointvec_minmax,
1217                 .extra1         = &one
1218         },
1219         {
1220                 .procname       = "udp_wmem_min",
1221                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1222                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1223                 .mode           = 0644,
1224                 .proc_handler   = proc_dointvec_minmax,
1225                 .extra1         = &one
1226         },
1227         { }
1228 };
1229
1230 static __net_init int ipv4_sysctl_init_net(struct net *net)
1231 {
1232         struct ctl_table *table;
1233
1234         table = ipv4_net_table;
1235         if (!net_eq(net, &init_net)) {
1236                 int i;
1237
1238                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1239                 if (!table)
1240                         goto err_alloc;
1241
1242                 /* Update the variables to point into the current struct net */
1243                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1244                         table[i].data += (void *)net - (void *)&init_net;
1245         }
1246
1247         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1248         if (!net->ipv4.ipv4_hdr)
1249                 goto err_reg;
1250
1251         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1252         if (!net->ipv4.sysctl_local_reserved_ports)
1253                 goto err_ports;
1254
1255         return 0;
1256
1257 err_ports:
1258         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1259 err_reg:
1260         if (!net_eq(net, &init_net))
1261                 kfree(table);
1262 err_alloc:
1263         return -ENOMEM;
1264 }
1265
1266 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1267 {
1268         struct ctl_table *table;
1269
1270         kfree(net->ipv4.sysctl_local_reserved_ports);
1271         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1272         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1273         kfree(table);
1274 }
1275
1276 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1277         .init = ipv4_sysctl_init_net,
1278         .exit = ipv4_sysctl_exit_net,
1279 };
1280
1281 static __init int sysctl_ipv4_init(void)
1282 {
1283         struct ctl_table_header *hdr;
1284
1285         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1286         if (!hdr)
1287                 return -ENOMEM;
1288
1289         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1290                 unregister_net_sysctl_table(hdr);
1291                 return -ENOMEM;
1292         }
1293
1294         return 0;
1295 }
1296
1297 __initcall(sysctl_ipv4_init);