net/ipv4/sysctl_net_ipv4.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   4  *
   5  * Begun April 1, 1996, Mike Shaver.
   6  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   7  */
   8
   9 #include <linux/mm.h>
  10 #include <linux/module.h>
  11 #include <linux/sysctl.h>
  12 #include <linux/igmp.h>
  13 #include <linux/inetdevice.h>
  14 #include <linux/seqlock.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/nsproxy.h>
  18 #include <linux/swap.h>
  19 #include <net/snmp.h>
  20 #include <net/icmp.h>
  21 #include <net/ip.h>
  22 #include <net/route.h>
  23 #include <net/tcp.h>
  24 #include <net/udp.h>
  25 #include <net/cipso_ipv4.h>
  26 #include <net/inet_frag.h>
  27 #include <net/ping.h>
  28 #include <net/protocol.h>
  29 #include <net/netevent.h>
  30
  31 static int zero;
  32 static int one = 1;
  33 static int two = 2;
  34 static int four = 4;
  35 static int thousand = 1000;
  36 static int gso_max_segs = GSO_MAX_SEGS;
  37 static int tcp_retr1_max = 255;
  38 static int ip_local_port_range_min[] = { 1, 1 };
  39 static int ip_local_port_range_max[] = { 65535, 65535 };
  40 static int tcp_adv_win_scale_min = -31;
  41 static int tcp_adv_win_scale_max = 31;
  42 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  43 static int tcp_min_snd_mss_max = 65535;
  44 static int ip_privileged_port_min;
  45 static int ip_privileged_port_max = 65535;
  46 static int ip_ttl_min = 1;
  47 static int ip_ttl_max = 255;
  48 static int tcp_syn_retries_min = 1;
  49 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  50 static int ip_ping_group_range_min[] = { 0, 0 };
  51 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  52 static int comp_sack_nr_max = 255;
  53 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  54 static int one_day_secs = 24 * 3600;
  55
  56 /* obsolete */
  57 static int sysctl_tcp_low_latency __read_mostly;
  58
  59 /* Update system visible IP port range */
  60 static void set_local_port_range(struct net *net, int range[2])
  61 {
  62         bool same_parity = !((range[0] ^ range[1]) & 1);
  63
  64         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  65         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  66                 net->ipv4.ip_local_ports.warned = true;
  67                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  68         }
  69         net->ipv4.ip_local_ports.range[0] = range[0];
  70         net->ipv4.ip_local_ports.range[1] = range[1];
  71         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  72 }
  73
  74 /* Validate changes from /proc interface. */
  75 static int ipv4_local_port_range(struct ctl_table *table, int write,
  76                                  void __user *buffer,
  77                                  size_t *lenp, loff_t *ppos)
  78 {
  79         struct net *net =
  80                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  81         int ret;
  82         int range[2];
  83         struct ctl_table tmp = {
  84                 .data = &range,
  85                 .maxlen = sizeof(range),
  86                 .mode = table->mode,
  87                 .extra1 = &ip_local_port_range_min,
  88                 .extra2 = &ip_local_port_range_max,
  89         };
  90
  91         inet_get_local_port_range(net, &range[0], &range[1]);
  92
  93         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  94
  95         if (write && ret == 0) {
  96                 /* Ensure that the upper limit is not smaller than the lower,
  97                  * and that the lower does not encroach upon the privileged
  98                  * port limit.
  99                  */
 100                 if ((range[1] < range[0]) ||
 101                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
 102                         ret = -EINVAL;
 103                 else
 104                         set_local_port_range(net, range);
 105         }
 106
 107         return ret;
 108 }
 109
 110 /* Validate changes from /proc interface. */
 111 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 112                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 113 {
 114         struct net *net = container_of(table->data, struct net,
 115             ipv4.sysctl_ip_prot_sock);
 116         int ret;
 117         int pports;
 118         int range[2];
 119         struct ctl_table tmp = {
 120                 .data = &pports,
 121                 .maxlen = sizeof(pports),
 122                 .mode = table->mode,
 123                 .extra1 = &ip_privileged_port_min,
 124                 .extra2 = &ip_privileged_port_max,
 125         };
 126
 127         pports = net->ipv4.sysctl_ip_prot_sock;
 128
 129         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 130
 131         if (write && ret == 0) {
 132                 inet_get_local_port_range(net, &range[0], &range[1]);
 133                 /* Ensure that the local port range doesn't overlap with the
 134                  * privileged port range.
 135                  */
 136                 if (range[0] < pports)
 137                         ret = -EINVAL;
 138                 else
 139                         net->ipv4.sysctl_ip_prot_sock = pports;
 140         }
 141
 142         return ret;
 143 }
 144
 145 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 146 {
 147         kgid_t *data = table->data;
 148         struct net *net =
 149                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 150         unsigned int seq;
 151         do {
 152                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 153
 154                 *low = data[0];
 155                 *high = data[1];
 156         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 157 }
 158
 159 /* Update system visible IP port range */
 160 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 161 {
 162         kgid_t *data = table->data;
 163         struct net *net =
 164                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 165         write_seqlock(&net->ipv4.ping_group_range.lock);
 166         data[0] = low;
 167         data[1] = high;
 168         write_sequnlock(&net->ipv4.ping_group_range.lock);
 169 }
 170
 171 /* Validate changes from /proc interface. */
 172 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 173                                  void __user *buffer,
 174                                  size_t *lenp, loff_t *ppos)
 175 {
 176         struct user_namespace *user_ns = current_user_ns();
 177         int ret;
 178         gid_t urange[2];
 179         kgid_t low, high;
 180         struct ctl_table tmp = {
 181                 .data = &urange,
 182                 .maxlen = sizeof(urange),
 183                 .mode = table->mode,
 184                 .extra1 = &ip_ping_group_range_min,
 185                 .extra2 = &ip_ping_group_range_max,
 186         };
 187
 188         inet_get_ping_group_range_table(table, &low, &high);
 189         urange[0] = from_kgid_munged(user_ns, low);
 190         urange[1] = from_kgid_munged(user_ns, high);
 191         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 192
 193         if (write && ret == 0) {
 194                 low = make_kgid(user_ns, urange[0]);
 195                 high = make_kgid(user_ns, urange[1]);
 196                 if (!gid_valid(low) || !gid_valid(high))
 197                         return -EINVAL;
 198                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 199                         low = make_kgid(&init_user_ns, 1);
 200                         high = make_kgid(&init_user_ns, 0);
 201                 }
 202                 set_ping_group_range(table, low, high);
 203         }
 204
 205         return ret;
 206 }
 207
 208 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 209                                     void __user *buffer,
 210                                     size_t *lenp, loff_t *ppos)
 211 {
 212         struct net *net;
 213         int ret;
 214
 215         net = container_of(table->data, struct net,
 216                            ipv4.sysctl_ip_fwd_update_priority);
 217         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 218         if (write && ret == 0)
 219                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 220                                         net);
 221
 222         return ret;
 223 }
 224
 225 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 226                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 227 {
 228         struct net *net = container_of(ctl->data, struct net,
 229                                        ipv4.tcp_congestion_control);
 230         char val[TCP_CA_NAME_MAX];
 231         struct ctl_table tbl = {
 232                 .data = val,
 233                 .maxlen = TCP_CA_NAME_MAX,
 234         };
 235         int ret;
 236
 237         tcp_get_default_congestion_control(net, val);
 238
 239         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 240         if (write && ret == 0)
 241                 ret = tcp_set_default_congestion_control(net, val);
 242         return ret;
 243 }
 244
 245 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 246                                                  int write,
 247                                                  void __user *buffer, size_t *lenp,
 248                                                  loff_t *ppos)
 249 {
 250         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 251         int ret;
 252
 253         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 254         if (!tbl.data)
 255                 return -ENOMEM;
 256         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 257         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 258         kfree(tbl.data);
 259         return ret;
 260 }
 261
 262 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 263                                            int write,
 264                                            void __user *buffer, size_t *lenp,
 265                                            loff_t *ppos)
 266 {
 267         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 268         int ret;
 269
 270         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 271         if (!tbl.data)
 272                 return -ENOMEM;
 273
 274         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 275         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 276         if (write && ret == 0)
 277                 ret = tcp_set_allowed_congestion_control(tbl.data);
 278         kfree(tbl.data);
 279         return ret;
 280 }
 281
 282 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 283                                  void __user *buffer, size_t *lenp,
 284                                  loff_t *ppos)
 285 {
 286         struct net *net = container_of(table->data, struct net,
 287             ipv4.sysctl_tcp_fastopen);
 288         struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
 289         struct tcp_fastopen_context *ctxt;
 290         u32  user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
 291         __le32 key[4];
 292         int ret, i;
 293
 294         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 295         if (!tbl.data)
 296                 return -ENOMEM;
 297
 298         rcu_read_lock();
 299         ctxt = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 300         if (ctxt)
 301                 memcpy(key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
 302         else
 303                 memset(key, 0, sizeof(key));
 304         rcu_read_unlock();
 305
 306         for (i = 0; i < ARRAY_SIZE(key); i++)
 307                 user_key[i] = le32_to_cpu(key[i]);
 308
 309         snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
 310                 user_key[0], user_key[1], user_key[2], user_key[3]);
 311         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 312
 313         if (write && ret == 0) {
 314                 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
 315                            user_key + 2, user_key + 3) != 4) {
 316                         ret = -EINVAL;
 317                         goto bad_key;
 318                 }
 319
 320                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 321                         key[i] = cpu_to_le32(user_key[i]);
 322
 323                 tcp_fastopen_reset_cipher(net, NULL, key,
 324                                           TCP_FASTOPEN_KEY_LENGTH);
 325         }
 326
 327 bad_key:
 328         pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 329                 user_key[0], user_key[1], user_key[2], user_key[3],
 330                (char *)tbl.data, ret);
 331         kfree(tbl.data);
 332         return ret;
 333 }
 334
 335 static void proc_configure_early_demux(int enabled, int protocol)
 336 {
 337         struct net_protocol *ipprot;
 338 #if IS_ENABLED(CONFIG_IPV6)
 339         struct inet6_protocol *ip6prot;
 340 #endif
 341
 342         rcu_read_lock();
 343
 344         ipprot = rcu_dereference(inet_protos[protocol]);
 345         if (ipprot)
 346                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 347                                                 NULL;
 348
 349 #if IS_ENABLED(CONFIG_IPV6)
 350         ip6prot = rcu_dereference(inet6_protos[protocol]);
 351         if (ip6prot)
 352                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 353                                                  NULL;
 354 #endif
 355         rcu_read_unlock();
 356 }
 357
 358 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 359                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 360 {
 361         int ret = 0;
 362
 363         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 364
 365         if (write && !ret) {
 366                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 367
 368                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 369         }
 370
 371         return ret;
 372 }
 373
 374 static int proc_udp_early_demux(struct ctl_table *table, int write,
 375                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 376 {
 377         int ret = 0;
 378
 379         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 380
 381         if (write && !ret) {
 382                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 383
 384                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 385         }
 386
 387         return ret;
 388 }
 389
 390 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 391                                              int write,
 392                                              void __user *buffer,
 393                                              size_t *lenp, loff_t *ppos)
 394 {
 395         struct net *net = container_of(table->data, struct net,
 396             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 397         int ret;
 398
 399         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 400         if (write && ret == 0)
 401                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 402
 403         return ret;
 404 }
 405
 406 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 407                                   int write,
 408                                   void __user *buffer, size_t *lenp,
 409                                   loff_t *ppos)
 410 {
 411         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 412         int ret;
 413
 414         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 415         if (!tbl.data)
 416                 return -ENOMEM;
 417         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 418         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 419         kfree(tbl.data);
 420
 421         return ret;
 422 }
 423
 424 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 425 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 426                                           void __user *buffer, size_t *lenp,
 427                                           loff_t *ppos)
 428 {
 429         struct net *net = container_of(table->data, struct net,
 430             ipv4.sysctl_fib_multipath_hash_policy);
 431         int ret;
 432
 433         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 434         if (write && ret == 0)
 435                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 436
 437         return ret;
 438 }
 439 #endif
 440
 441 static struct ctl_table ipv4_table[] = {
 442         {
 443                 .procname       = "tcp_max_orphans",
 444                 .data           = &sysctl_tcp_max_orphans,
 445                 .maxlen         = sizeof(int),
 446                 .mode           = 0644,
 447                 .proc_handler   = proc_dointvec
 448         },
 449         {
 450                 .procname       = "inet_peer_threshold",
 451                 .data           = &inet_peer_threshold,
 452                 .maxlen         = sizeof(int),
 453                 .mode           = 0644,
 454                 .proc_handler   = proc_dointvec
 455         },
 456         {
 457                 .procname       = "inet_peer_minttl",
 458                 .data           = &inet_peer_minttl,
 459                 .maxlen         = sizeof(int),
 460                 .mode           = 0644,
 461                 .proc_handler   = proc_dointvec_jiffies,
 462         },
 463         {
 464                 .procname       = "inet_peer_maxttl",
 465                 .data           = &inet_peer_maxttl,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec_jiffies,
 469         },
 470         {
 471                 .procname       = "tcp_mem",
 472                 .maxlen         = sizeof(sysctl_tcp_mem),
 473                 .data           = &sysctl_tcp_mem,
 474                 .mode           = 0644,
 475                 .proc_handler   = proc_doulongvec_minmax,
 476         },
 477         {
 478                 .procname       = "tcp_low_latency",
 479                 .data           = &sysctl_tcp_low_latency,
 480                 .maxlen         = sizeof(int),
 481                 .mode           = 0644,
 482                 .proc_handler   = proc_dointvec
 483         },
 484 #ifdef CONFIG_NETLABEL
 485         {
 486                 .procname       = "cipso_cache_enable",
 487                 .data           = &cipso_v4_cache_enabled,
 488                 .maxlen         = sizeof(int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec,
 491         },
 492         {
 493                 .procname       = "cipso_cache_bucket_size",
 494                 .data           = &cipso_v4_cache_bucketsize,
 495                 .maxlen         = sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = proc_dointvec,
 498         },
 499         {
 500                 .procname       = "cipso_rbm_optfmt",
 501                 .data           = &cipso_v4_rbm_optfmt,
 502                 .maxlen         = sizeof(int),
 503                 .mode           = 0644,
 504                 .proc_handler   = proc_dointvec,
 505         },
 506         {
 507                 .procname       = "cipso_rbm_strictvalid",
 508                 .data           = &cipso_v4_rbm_strictvalid,
 509                 .maxlen         = sizeof(int),
 510                 .mode           = 0644,
 511                 .proc_handler   = proc_dointvec,
 512         },
 513 #endif /* CONFIG_NETLABEL */
 514         {
 515                 .procname       = "tcp_available_congestion_control",
 516                 .maxlen         = TCP_CA_BUF_MAX,
 517                 .mode           = 0444,
 518                 .proc_handler   = proc_tcp_available_congestion_control,
 519         },
 520         {
 521                 .procname       = "tcp_allowed_congestion_control",
 522                 .maxlen         = TCP_CA_BUF_MAX,
 523                 .mode           = 0644,
 524                 .proc_handler   = proc_allowed_congestion_control,
 525         },
 526         {
 527                 .procname       = "tcp_available_ulp",
 528                 .maxlen         = TCP_ULP_BUF_MAX,
 529                 .mode           = 0444,
 530                 .proc_handler   = proc_tcp_available_ulp,
 531         },
 532         {
 533                 .procname       = "icmp_msgs_per_sec",
 534                 .data           = &sysctl_icmp_msgs_per_sec,
 535                 .maxlen         = sizeof(int),
 536                 .mode           = 0644,
 537                 .proc_handler   = proc_dointvec_minmax,
 538                 .extra1         = &zero,
 539         },
 540         {
 541                 .procname       = "icmp_msgs_burst",
 542                 .data           = &sysctl_icmp_msgs_burst,
 543                 .maxlen         = sizeof(int),
 544                 .mode           = 0644,
 545                 .proc_handler   = proc_dointvec_minmax,
 546                 .extra1         = &zero,
 547         },
 548         {
 549                 .procname       = "udp_mem",
 550                 .data           = &sysctl_udp_mem,
 551                 .maxlen         = sizeof(sysctl_udp_mem),
 552                 .mode           = 0644,
 553                 .proc_handler   = proc_doulongvec_minmax,
 554         },
 555         {
 556                 .procname       = "fib_sync_mem",
 557                 .data           = &sysctl_fib_sync_mem,
 558                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 559                 .mode           = 0644,
 560                 .proc_handler   = proc_douintvec_minmax,
 561                 .extra1         = &sysctl_fib_sync_mem_min,
 562                 .extra2         = &sysctl_fib_sync_mem_max,
 563         },
 564         {
 565                 .procname       = "tcp_rx_skb_cache",
 566                 .data           = &tcp_rx_skb_cache_key.key,
 567                 .mode           = 0644,
 568                 .proc_handler   = proc_do_static_key,
 569         },
 570         {
 571                 .procname       = "tcp_tx_skb_cache",
 572                 .data           = &tcp_tx_skb_cache_key.key,
 573                 .mode           = 0644,
 574                 .proc_handler   = proc_do_static_key,
 575         },
 576         { }
 577 };
 578
 579 static struct ctl_table ipv4_net_table[] = {
 580         {
 581                 .procname       = "icmp_echo_ignore_all",
 582                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = proc_dointvec
 586         },
 587         {
 588                 .procname       = "icmp_echo_ignore_broadcasts",
 589                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 590                 .maxlen         = sizeof(int),
 591                 .mode           = 0644,
 592                 .proc_handler   = proc_dointvec
 593         },
 594         {
 595                 .procname       = "icmp_ignore_bogus_error_responses",
 596                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 597                 .maxlen         = sizeof(int),
 598                 .mode           = 0644,
 599                 .proc_handler   = proc_dointvec
 600         },
 601         {
 602                 .procname       = "icmp_errors_use_inbound_ifaddr",
 603                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 604                 .maxlen         = sizeof(int),
 605                 .mode           = 0644,
 606                 .proc_handler   = proc_dointvec
 607         },
 608         {
 609                 .procname       = "icmp_ratelimit",
 610                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 611                 .maxlen         = sizeof(int),
 612                 .mode           = 0644,
 613                 .proc_handler   = proc_dointvec_ms_jiffies,
 614         },
 615         {
 616                 .procname       = "icmp_ratemask",
 617                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 618                 .maxlen         = sizeof(int),
 619                 .mode           = 0644,
 620                 .proc_handler   = proc_dointvec
 621         },
 622         {
 623                 .procname       = "ping_group_range",
 624                 .data           = &init_net.ipv4.ping_group_range.range,
 625                 .maxlen         = sizeof(gid_t)*2,
 626                 .mode           = 0644,
 627                 .proc_handler   = ipv4_ping_group_range,
 628         },
 629 #ifdef CONFIG_NET_L3_MASTER_DEV
 630         {
 631                 .procname       = "raw_l3mdev_accept",
 632                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = proc_dointvec_minmax,
 636                 .extra1         = &zero,
 637                 .extra2         = &one,
 638         },
 639 #endif
 640         {
 641                 .procname       = "tcp_ecn",
 642                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 643                 .maxlen         = sizeof(int),
 644                 .mode           = 0644,
 645                 .proc_handler   = proc_dointvec
 646         },
 647         {
 648                 .procname       = "tcp_ecn_fallback",
 649                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 650                 .maxlen         = sizeof(int),
 651                 .mode           = 0644,
 652                 .proc_handler   = proc_dointvec
 653         },
 654         {
 655                 .procname       = "ip_dynaddr",
 656                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 657                 .maxlen         = sizeof(int),
 658                 .mode           = 0644,
 659                 .proc_handler   = proc_dointvec
 660         },
 661         {
 662                 .procname       = "ip_early_demux",
 663                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 .proc_handler   = proc_dointvec
 667         },
 668         {
 669                 .procname       = "udp_early_demux",
 670                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 671                 .maxlen         = sizeof(int),
 672                 .mode           = 0644,
 673                 .proc_handler   = proc_udp_early_demux
 674         },
 675         {
 676                 .procname       = "tcp_early_demux",
 677                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 678                 .maxlen         = sizeof(int),
 679                 .mode           = 0644,
 680                 .proc_handler   = proc_tcp_early_demux
 681         },
 682         {
 683                 .procname       = "ip_default_ttl",
 684                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 685                 .maxlen         = sizeof(int),
 686                 .mode           = 0644,
 687                 .proc_handler   = proc_dointvec_minmax,
 688                 .extra1         = &ip_ttl_min,
 689                 .extra2         = &ip_ttl_max,
 690         },
 691         {
 692                 .procname       = "ip_local_port_range",
 693                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 694                 .data           = &init_net.ipv4.ip_local_ports.range,
 695                 .mode           = 0644,
 696                 .proc_handler   = ipv4_local_port_range,
 697         },
 698         {
 699                 .procname       = "ip_local_reserved_ports",
 700                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 701                 .maxlen         = 65536,
 702                 .mode           = 0644,
 703                 .proc_handler   = proc_do_large_bitmap,
 704         },
 705         {
 706                 .procname       = "ip_no_pmtu_disc",
 707                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 708                 .maxlen         = sizeof(int),
 709                 .mode           = 0644,
 710                 .proc_handler   = proc_dointvec
 711         },
 712         {
 713                 .procname       = "ip_forward_use_pmtu",
 714                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 715                 .maxlen         = sizeof(int),
 716                 .mode           = 0644,
 717                 .proc_handler   = proc_dointvec,
 718         },
 719         {
 720                 .procname       = "ip_forward_update_priority",
 721                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 722                 .maxlen         = sizeof(int),
 723                 .mode           = 0644,
 724                 .proc_handler   = ipv4_fwd_update_priority,
 725                 .extra1         = &zero,
 726                 .extra2         = &one,
 727         },
 728         {
 729                 .procname       = "ip_nonlocal_bind",
 730                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 731                 .maxlen         = sizeof(int),
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_dointvec
 734         },
 735         {
 736                 .procname       = "fwmark_reflect",
 737                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 738                 .maxlen         = sizeof(int),
 739                 .mode           = 0644,
 740                 .proc_handler   = proc_dointvec,
 741         },
 742         {
 743                 .procname       = "tcp_fwmark_accept",
 744                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 745                 .maxlen         = sizeof(int),
 746                 .mode           = 0644,
 747                 .proc_handler   = proc_dointvec,
 748         },
 749 #ifdef CONFIG_NET_L3_MASTER_DEV
 750         {
 751                 .procname       = "tcp_l3mdev_accept",
 752                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 753                 .maxlen         = sizeof(int),
 754                 .mode           = 0644,
 755                 .proc_handler   = proc_dointvec_minmax,
 756                 .extra1         = &zero,
 757                 .extra2         = &one,
 758         },
 759 #endif
 760         {
 761                 .procname       = "tcp_mtu_probing",
 762                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 763                 .maxlen         = sizeof(int),
 764                 .mode           = 0644,
 765                 .proc_handler   = proc_dointvec,
 766         },
 767         {
 768                 .procname       = "tcp_base_mss",
 769                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 770                 .maxlen         = sizeof(int),
 771                 .mode           = 0644,
 772                 .proc_handler   = proc_dointvec,
 773         },
 774         {
 775                 .procname       = "tcp_min_snd_mss",
 776                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 777                 .maxlen         = sizeof(int),
 778                 .mode           = 0644,
 779                 .proc_handler   = proc_dointvec_minmax,
 780                 .extra1         = &tcp_min_snd_mss_min,
 781                 .extra2         = &tcp_min_snd_mss_max,
 782         },
 783         {
 784                 .procname       = "tcp_probe_threshold",
 785                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 786                 .maxlen         = sizeof(int),
 787                 .mode           = 0644,
 788                 .proc_handler   = proc_dointvec,
 789         },
 790         {
 791                 .procname       = "tcp_probe_interval",
 792                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 793                 .maxlen         = sizeof(u32),
 794                 .mode           = 0644,
 795                 .proc_handler   = proc_douintvec_minmax,
 796                 .extra2         = &u32_max_div_HZ,
 797         },
 798         {
 799                 .procname       = "igmp_link_local_mcast_reports",
 800                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 801                 .maxlen         = sizeof(int),
 802                 .mode           = 0644,
 803                 .proc_handler   = proc_dointvec
 804         },
 805         {
 806                 .procname       = "igmp_max_memberships",
 807                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 808                 .maxlen         = sizeof(int),
 809                 .mode           = 0644,
 810                 .proc_handler   = proc_dointvec
 811         },
 812         {
 813                 .procname       = "igmp_max_msf",
 814                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 815                 .maxlen         = sizeof(int),
 816                 .mode           = 0644,
 817                 .proc_handler   = proc_dointvec
 818         },
 819 #ifdef CONFIG_IP_MULTICAST
 820         {
 821                 .procname       = "igmp_qrv",
 822                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 823                 .maxlen         = sizeof(int),
 824                 .mode           = 0644,
 825                 .proc_handler   = proc_dointvec_minmax,
 826                 .extra1         = &one
 827         },
 828 #endif
 829         {
 830                 .procname       = "tcp_congestion_control",
 831                 .data           = &init_net.ipv4.tcp_congestion_control,
 832                 .mode           = 0644,
 833                 .maxlen         = TCP_CA_NAME_MAX,
 834                 .proc_handler   = proc_tcp_congestion_control,
 835         },
 836         {
 837                 .procname       = "tcp_keepalive_time",
 838                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 839                 .maxlen         = sizeof(int),
 840                 .mode           = 0644,
 841                 .proc_handler   = proc_dointvec_jiffies,
 842         },
 843         {
 844                 .procname       = "tcp_keepalive_probes",
 845                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 846                 .maxlen         = sizeof(int),
 847                 .mode           = 0644,
 848                 .proc_handler   = proc_dointvec
 849         },
 850         {
 851                 .procname       = "tcp_keepalive_intvl",
 852                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 853                 .maxlen         = sizeof(int),
 854                 .mode           = 0644,
 855                 .proc_handler   = proc_dointvec_jiffies,
 856         },
 857         {
 858                 .procname       = "tcp_syn_retries",
 859                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 860                 .maxlen         = sizeof(int),
 861                 .mode           = 0644,
 862                 .proc_handler   = proc_dointvec_minmax,
 863                 .extra1         = &tcp_syn_retries_min,
 864                 .extra2         = &tcp_syn_retries_max
 865         },
 866         {
 867                 .procname       = "tcp_synack_retries",
 868                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 869                 .maxlen         = sizeof(int),
 870                 .mode           = 0644,
 871                 .proc_handler   = proc_dointvec
 872         },
 873 #ifdef CONFIG_SYN_COOKIES
 874         {
 875                 .procname       = "tcp_syncookies",
 876                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 877                 .maxlen         = sizeof(int),
 878                 .mode           = 0644,
 879                 .proc_handler   = proc_dointvec
 880         },
 881 #endif
 882         {
 883                 .procname       = "tcp_reordering",
 884                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 885                 .maxlen         = sizeof(int),
 886                 .mode           = 0644,
 887                 .proc_handler   = proc_dointvec
 888         },
 889         {
 890                 .procname       = "tcp_retries1",
 891                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 892                 .maxlen         = sizeof(int),
 893                 .mode           = 0644,
 894                 .proc_handler   = proc_dointvec_minmax,
 895                 .extra2         = &tcp_retr1_max
 896         },
 897         {
 898                 .procname       = "tcp_retries2",
 899                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 900                 .maxlen         = sizeof(int),
 901                 .mode           = 0644,
 902                 .proc_handler   = proc_dointvec
 903         },
 904         {
 905                 .procname       = "tcp_orphan_retries",
 906                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 907                 .maxlen         = sizeof(int),
 908                 .mode           = 0644,
 909                 .proc_handler   = proc_dointvec
 910         },
 911         {
 912                 .procname       = "tcp_fin_timeout",
 913                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 914                 .maxlen         = sizeof(int),
 915                 .mode           = 0644,
 916                 .proc_handler   = proc_dointvec_jiffies,
 917         },
 918         {
 919                 .procname       = "tcp_notsent_lowat",
 920                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 921                 .maxlen         = sizeof(unsigned int),
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_douintvec,
 924         },
 925         {
 926                 .procname       = "tcp_tw_reuse",
 927                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 928                 .maxlen         = sizeof(int),
 929                 .mode           = 0644,
 930                 .proc_handler   = proc_dointvec_minmax,
 931                 .extra1         = &zero,
 932                 .extra2         = &two,
 933         },
 934         {
 935                 .procname       = "tcp_max_tw_buckets",
 936                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 937                 .maxlen         = sizeof(int),
 938                 .mode           = 0644,
 939                 .proc_handler   = proc_dointvec
 940         },
 941         {
 942                 .procname       = "tcp_max_syn_backlog",
 943                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 944                 .maxlen         = sizeof(int),
 945                 .mode           = 0644,
 946                 .proc_handler   = proc_dointvec
 947         },
 948         {
 949                 .procname       = "tcp_fastopen",
 950                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 951                 .maxlen         = sizeof(int),
 952                 .mode           = 0644,
 953                 .proc_handler   = proc_dointvec,
 954         },
 955         {
 956                 .procname       = "tcp_fastopen_key",
 957                 .mode           = 0600,
 958                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 959                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 960                 .proc_handler   = proc_tcp_fastopen_key,
 961         },
 962         {
 963                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
 964                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
 965                 .maxlen         = sizeof(int),
 966                 .mode           = 0644,
 967                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
 968                 .extra1         = &zero,
 969         },
 970 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 971         {
 972                 .procname       = "fib_multipath_use_neigh",
 973                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
 974                 .maxlen         = sizeof(int),
 975                 .mode           = 0644,
 976                 .proc_handler   = proc_dointvec_minmax,
 977                 .extra1         = &zero,
 978                 .extra2         = &one,
 979         },
 980         {
 981                 .procname       = "fib_multipath_hash_policy",
 982                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
 983                 .maxlen         = sizeof(int),
 984                 .mode           = 0644,
 985                 .proc_handler   = proc_fib_multipath_hash_policy,
 986                 .extra1         = &zero,
 987                 .extra2         = &one,
 988         },
 989 #endif
 990         {
 991                 .procname       = "ip_unprivileged_port_start",
 992                 .maxlen         = sizeof(int),
 993                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
 994                 .mode           = 0644,
 995                 .proc_handler   = ipv4_privileged_ports,
 996         },
 997 #ifdef CONFIG_NET_L3_MASTER_DEV
 998         {
 999                 .procname       = "udp_l3mdev_accept",
1000                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1001                 .maxlen         = sizeof(int),
1002                 .mode           = 0644,
1003                 .proc_handler   = proc_dointvec_minmax,
1004                 .extra1         = &zero,
1005                 .extra2         = &one,
1006         },
1007 #endif
1008         {
1009                 .procname       = "tcp_sack",
1010                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1011                 .maxlen         = sizeof(int),
1012                 .mode           = 0644,
1013                 .proc_handler   = proc_dointvec
1014         },
1015         {
1016                 .procname       = "tcp_window_scaling",
1017                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1018                 .maxlen         = sizeof(int),
1019                 .mode           = 0644,
1020                 .proc_handler   = proc_dointvec
1021         },
1022         {
1023                 .procname       = "tcp_timestamps",
1024                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1025                 .maxlen         = sizeof(int),
1026                 .mode           = 0644,
1027                 .proc_handler   = proc_dointvec
1028         },
1029         {
1030                 .procname       = "tcp_early_retrans",
1031                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1032                 .maxlen         = sizeof(int),
1033                 .mode           = 0644,
1034                 .proc_handler   = proc_dointvec_minmax,
1035                 .extra1         = &zero,
1036                 .extra2         = &four,
1037         },
1038         {
1039                 .procname       = "tcp_recovery",
1040                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1041                 .maxlen         = sizeof(int),
1042                 .mode           = 0644,
1043                 .proc_handler   = proc_dointvec,
1044         },
1045         {
1046                 .procname       = "tcp_thin_linear_timeouts",
1047                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1048                 .maxlen         = sizeof(int),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_dointvec
1051         },
1052         {
1053                 .procname       = "tcp_slow_start_after_idle",
1054                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1055                 .maxlen         = sizeof(int),
1056                 .mode           = 0644,
1057                 .proc_handler   = proc_dointvec
1058         },
1059         {
1060                 .procname       = "tcp_retrans_collapse",
1061                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1062                 .maxlen         = sizeof(int),
1063                 .mode           = 0644,
1064                 .proc_handler   = proc_dointvec
1065         },
1066         {
1067                 .procname       = "tcp_stdurg",
1068                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1069                 .maxlen         = sizeof(int),
1070                 .mode           = 0644,
1071                 .proc_handler   = proc_dointvec
1072         },
1073         {
1074                 .procname       = "tcp_rfc1337",
1075                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1076                 .maxlen         = sizeof(int),
1077                 .mode           = 0644,
1078                 .proc_handler   = proc_dointvec
1079         },
1080         {
1081                 .procname       = "tcp_abort_on_overflow",
1082                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1083                 .maxlen         = sizeof(int),
1084                 .mode           = 0644,
1085                 .proc_handler   = proc_dointvec
1086         },
1087         {
1088                 .procname       = "tcp_fack",
1089                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1090                 .maxlen         = sizeof(int),
1091                 .mode           = 0644,
1092                 .proc_handler   = proc_dointvec
1093         },
1094         {
1095                 .procname       = "tcp_max_reordering",
1096                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1097                 .maxlen         = sizeof(int),
1098                 .mode           = 0644,
1099                 .proc_handler   = proc_dointvec
1100         },
1101         {
1102                 .procname       = "tcp_dsack",
1103                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1104                 .maxlen         = sizeof(int),
1105                 .mode           = 0644,
1106                 .proc_handler   = proc_dointvec
1107         },
1108         {
1109                 .procname       = "tcp_app_win",
1110                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1111                 .maxlen         = sizeof(int),
1112                 .mode           = 0644,
1113                 .proc_handler   = proc_dointvec
1114         },
1115         {
1116                 .procname       = "tcp_adv_win_scale",
1117                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1118                 .maxlen         = sizeof(int),
1119                 .mode           = 0644,
1120                 .proc_handler   = proc_dointvec_minmax,
1121                 .extra1         = &tcp_adv_win_scale_min,
1122                 .extra2         = &tcp_adv_win_scale_max,
1123         },
1124         {
1125                 .procname       = "tcp_frto",
1126                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1127                 .maxlen         = sizeof(int),
1128                 .mode           = 0644,
1129                 .proc_handler   = proc_dointvec
1130         },
1131         {
1132                 .procname       = "tcp_no_metrics_save",
1133                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1134                 .maxlen         = sizeof(int),
1135                 .mode           = 0644,
1136                 .proc_handler   = proc_dointvec,
1137         },
1138         {
1139                 .procname       = "tcp_moderate_rcvbuf",
1140                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1141                 .maxlen         = sizeof(int),
1142                 .mode           = 0644,
1143                 .proc_handler   = proc_dointvec,
1144         },
1145         {
1146                 .procname       = "tcp_tso_win_divisor",
1147                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1148                 .maxlen         = sizeof(int),
1149                 .mode           = 0644,
1150                 .proc_handler   = proc_dointvec,
1151         },
1152         {
1153                 .procname       = "tcp_workaround_signed_windows",
1154                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1155                 .maxlen         = sizeof(int),
1156                 .mode           = 0644,
1157                 .proc_handler   = proc_dointvec
1158         },
1159         {
1160                 .procname       = "tcp_limit_output_bytes",
1161                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1162                 .maxlen         = sizeof(int),
1163                 .mode           = 0644,
1164                 .proc_handler   = proc_dointvec
1165         },
1166         {
1167                 .procname       = "tcp_challenge_ack_limit",
1168                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1169                 .maxlen         = sizeof(int),
1170                 .mode           = 0644,
1171                 .proc_handler   = proc_dointvec
1172         },
1173         {
1174                 .procname       = "tcp_min_tso_segs",
1175                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1176                 .maxlen         = sizeof(int),
1177                 .mode           = 0644,
1178                 .proc_handler   = proc_dointvec_minmax,
1179                 .extra1         = &one,
1180                 .extra2         = &gso_max_segs,
1181         },
1182         {
1183                 .procname       = "tcp_min_rtt_wlen",
1184                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1185                 .maxlen         = sizeof(int),
1186                 .mode           = 0644,
1187                 .proc_handler   = proc_dointvec_minmax,
1188                 .extra1         = &zero,
1189                 .extra2         = &one_day_secs
1190         },
1191         {
1192                 .procname       = "tcp_autocorking",
1193                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1194                 .maxlen         = sizeof(int),
1195                 .mode           = 0644,
1196                 .proc_handler   = proc_dointvec_minmax,
1197                 .extra1         = &zero,
1198                 .extra2         = &one,
1199         },
1200         {
1201                 .procname       = "tcp_invalid_ratelimit",
1202                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1203                 .maxlen         = sizeof(int),
1204                 .mode           = 0644,
1205                 .proc_handler   = proc_dointvec_ms_jiffies,
1206         },
1207         {
1208                 .procname       = "tcp_pacing_ss_ratio",
1209                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1210                 .maxlen         = sizeof(int),
1211                 .mode           = 0644,
1212                 .proc_handler   = proc_dointvec_minmax,
1213                 .extra1         = &zero,
1214                 .extra2         = &thousand,
1215         },
1216         {
1217                 .procname       = "tcp_pacing_ca_ratio",
1218                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1219                 .maxlen         = sizeof(int),
1220                 .mode           = 0644,
1221                 .proc_handler   = proc_dointvec_minmax,
1222                 .extra1         = &zero,
1223                 .extra2         = &thousand,
1224         },
1225         {
1226                 .procname       = "tcp_wmem",
1227                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1228                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1229                 .mode           = 0644,
1230                 .proc_handler   = proc_dointvec_minmax,
1231                 .extra1         = &one,
1232         },
1233         {
1234                 .procname       = "tcp_rmem",
1235                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1236                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1237                 .mode           = 0644,
1238                 .proc_handler   = proc_dointvec_minmax,
1239                 .extra1         = &one,
1240         },
1241         {
1242                 .procname       = "tcp_comp_sack_delay_ns",
1243                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1244                 .maxlen         = sizeof(unsigned long),
1245                 .mode           = 0644,
1246                 .proc_handler   = proc_doulongvec_minmax,
1247         },
1248         {
1249                 .procname       = "tcp_comp_sack_nr",
1250                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1251                 .maxlen         = sizeof(int),
1252                 .mode           = 0644,
1253                 .proc_handler   = proc_dointvec_minmax,
1254                 .extra1         = &zero,
1255                 .extra2         = &comp_sack_nr_max,
1256         },
1257         {
1258                 .procname       = "udp_rmem_min",
1259                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1260                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1261                 .mode           = 0644,
1262                 .proc_handler   = proc_dointvec_minmax,
1263                 .extra1         = &one
1264         },
1265         {
1266                 .procname       = "udp_wmem_min",
1267                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1268                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1269                 .mode           = 0644,
1270                 .proc_handler   = proc_dointvec_minmax,
1271                 .extra1         = &one
1272         },
1273         { }
1274 };
1275
1276 static __net_init int ipv4_sysctl_init_net(struct net *net)
1277 {
1278         struct ctl_table *table;
1279
1280         table = ipv4_net_table;
1281         if (!net_eq(net, &init_net)) {
1282                 int i;
1283
1284                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1285                 if (!table)
1286                         goto err_alloc;
1287
1288                 /* Update the variables to point into the current struct net */
1289                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1290                         table[i].data += (void *)net - (void *)&init_net;
1291         }
1292
1293         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1294         if (!net->ipv4.ipv4_hdr)
1295                 goto err_reg;
1296
1297         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1298         if (!net->ipv4.sysctl_local_reserved_ports)
1299                 goto err_ports;
1300
1301         return 0;
1302
1303 err_ports:
1304         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1305 err_reg:
1306         if (!net_eq(net, &init_net))
1307                 kfree(table);
1308 err_alloc:
1309         return -ENOMEM;
1310 }
1311
1312 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1313 {
1314         struct ctl_table *table;
1315
1316         kfree(net->ipv4.sysctl_local_reserved_ports);
1317         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1318         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1319         kfree(table);
1320 }
1321
1322 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1323         .init = ipv4_sysctl_init_net,
1324         .exit = ipv4_sysctl_exit_net,
1325 };
1326
1327 static __init int sysctl_ipv4_init(void)
1328 {
1329         struct ctl_table_header *hdr;
1330
1331         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1332         if (!hdr)
1333                 return -ENOMEM;
1334
1335         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1336                 unregister_net_sysctl_table(hdr);
1337                 return -ENOMEM;
1338         }
1339
1340         return 0;
1341 }
1342
1343 __initcall(sysctl_ipv4_init);