net/ipv4/sysctl_net_ipv4.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   4  *
   5  * Begun April 1, 1996, Mike Shaver.
   6  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   7  */
   8
   9 #include <linux/mm.h>
  10 #include <linux/module.h>
  11 #include <linux/sysctl.h>
  12 #include <linux/igmp.h>
  13 #include <linux/inetdevice.h>
  14 #include <linux/seqlock.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/nsproxy.h>
  18 #include <linux/swap.h>
  19 #include <net/snmp.h>
  20 #include <net/icmp.h>
  21 #include <net/ip.h>
  22 #include <net/route.h>
  23 #include <net/tcp.h>
  24 #include <net/udp.h>
  25 #include <net/cipso_ipv4.h>
  26 #include <net/inet_frag.h>
  27 #include <net/ping.h>
  28 #include <net/protocol.h>
  29 #include <net/netevent.h>
  30
  31 static int zero;
  32 static int one = 1;
  33 static int two = 2;
  34 static int four = 4;
  35 static int thousand = 1000;
  36 static int gso_max_segs = GSO_MAX_SEGS;
  37 static int tcp_retr1_max = 255;
  38 static int ip_local_port_range_min[] = { 1, 1 };
  39 static int ip_local_port_range_max[] = { 65535, 65535 };
  40 static int tcp_adv_win_scale_min = -31;
  41 static int tcp_adv_win_scale_max = 31;
  42 static int ip_privileged_port_min;
  43 static int ip_privileged_port_max = 65535;
  44 static int ip_ttl_min = 1;
  45 static int ip_ttl_max = 255;
  46 static int tcp_syn_retries_min = 1;
  47 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  48 static int ip_ping_group_range_min[] = { 0, 0 };
  49 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  50 static int comp_sack_nr_max = 255;
  51 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  52 static int one_day_secs = 24 * 3600;
  53
  54 /* obsolete */
  55 static int sysctl_tcp_low_latency __read_mostly;
  56
  57 /* Update system visible IP port range */
  58 static void set_local_port_range(struct net *net, int range[2])
  59 {
  60         bool same_parity = !((range[0] ^ range[1]) & 1);
  61
  62         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  63         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  64                 net->ipv4.ip_local_ports.warned = true;
  65                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  66         }
  67         net->ipv4.ip_local_ports.range[0] = range[0];
  68         net->ipv4.ip_local_ports.range[1] = range[1];
  69         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  70 }
  71
  72 /* Validate changes from /proc interface. */
  73 static int ipv4_local_port_range(struct ctl_table *table, int write,
  74                                  void __user *buffer,
  75                                  size_t *lenp, loff_t *ppos)
  76 {
  77         struct net *net =
  78                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  79         int ret;
  80         int range[2];
  81         struct ctl_table tmp = {
  82                 .data = &range,
  83                 .maxlen = sizeof(range),
  84                 .mode = table->mode,
  85                 .extra1 = &ip_local_port_range_min,
  86                 .extra2 = &ip_local_port_range_max,
  87         };
  88
  89         inet_get_local_port_range(net, &range[0], &range[1]);
  90
  91         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  92
  93         if (write && ret == 0) {
  94                 /* Ensure that the upper limit is not smaller than the lower,
  95                  * and that the lower does not encroach upon the privileged
  96                  * port limit.
  97                  */
  98                 if ((range[1] < range[0]) ||
  99                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
 100                         ret = -EINVAL;
 101                 else
 102                         set_local_port_range(net, range);
 103         }
 104
 105         return ret;
 106 }
 107
 108 /* Validate changes from /proc interface. */
 109 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 110                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 111 {
 112         struct net *net = container_of(table->data, struct net,
 113             ipv4.sysctl_ip_prot_sock);
 114         int ret;
 115         int pports;
 116         int range[2];
 117         struct ctl_table tmp = {
 118                 .data = &pports,
 119                 .maxlen = sizeof(pports),
 120                 .mode = table->mode,
 121                 .extra1 = &ip_privileged_port_min,
 122                 .extra2 = &ip_privileged_port_max,
 123         };
 124
 125         pports = net->ipv4.sysctl_ip_prot_sock;
 126
 127         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 128
 129         if (write && ret == 0) {
 130                 inet_get_local_port_range(net, &range[0], &range[1]);
 131                 /* Ensure that the local port range doesn't overlap with the
 132                  * privileged port range.
 133                  */
 134                 if (range[0] < pports)
 135                         ret = -EINVAL;
 136                 else
 137                         net->ipv4.sysctl_ip_prot_sock = pports;
 138         }
 139
 140         return ret;
 141 }
 142
 143 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 144 {
 145         kgid_t *data = table->data;
 146         struct net *net =
 147                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 148         unsigned int seq;
 149         do {
 150                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 151
 152                 *low = data[0];
 153                 *high = data[1];
 154         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 155 }
 156
 157 /* Update system visible IP port range */
 158 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 159 {
 160         kgid_t *data = table->data;
 161         struct net *net =
 162                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 163         write_seqlock(&net->ipv4.ping_group_range.lock);
 164         data[0] = low;
 165         data[1] = high;
 166         write_sequnlock(&net->ipv4.ping_group_range.lock);
 167 }
 168
 169 /* Validate changes from /proc interface. */
 170 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 171                                  void __user *buffer,
 172                                  size_t *lenp, loff_t *ppos)
 173 {
 174         struct user_namespace *user_ns = current_user_ns();
 175         int ret;
 176         gid_t urange[2];
 177         kgid_t low, high;
 178         struct ctl_table tmp = {
 179                 .data = &urange,
 180                 .maxlen = sizeof(urange),
 181                 .mode = table->mode,
 182                 .extra1 = &ip_ping_group_range_min,
 183                 .extra2 = &ip_ping_group_range_max,
 184         };
 185
 186         inet_get_ping_group_range_table(table, &low, &high);
 187         urange[0] = from_kgid_munged(user_ns, low);
 188         urange[1] = from_kgid_munged(user_ns, high);
 189         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 190
 191         if (write && ret == 0) {
 192                 low = make_kgid(user_ns, urange[0]);
 193                 high = make_kgid(user_ns, urange[1]);
 194                 if (!gid_valid(low) || !gid_valid(high))
 195                         return -EINVAL;
 196                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 197                         low = make_kgid(&init_user_ns, 1);
 198                         high = make_kgid(&init_user_ns, 0);
 199                 }
 200                 set_ping_group_range(table, low, high);
 201         }
 202
 203         return ret;
 204 }
 205
 206 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 207                                     void __user *buffer,
 208                                     size_t *lenp, loff_t *ppos)
 209 {
 210         struct net *net;
 211         int ret;
 212
 213         net = container_of(table->data, struct net,
 214                            ipv4.sysctl_ip_fwd_update_priority);
 215         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 216         if (write && ret == 0)
 217                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 218                                         net);
 219
 220         return ret;
 221 }
 222
 223 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 224                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 225 {
 226         struct net *net = container_of(ctl->data, struct net,
 227                                        ipv4.tcp_congestion_control);
 228         char val[TCP_CA_NAME_MAX];
 229         struct ctl_table tbl = {
 230                 .data = val,
 231                 .maxlen = TCP_CA_NAME_MAX,
 232         };
 233         int ret;
 234
 235         tcp_get_default_congestion_control(net, val);
 236
 237         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 238         if (write && ret == 0)
 239                 ret = tcp_set_default_congestion_control(net, val);
 240         return ret;
 241 }
 242
 243 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 244                                                  int write,
 245                                                  void __user *buffer, size_t *lenp,
 246                                                  loff_t *ppos)
 247 {
 248         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 249         int ret;
 250
 251         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 252         if (!tbl.data)
 253                 return -ENOMEM;
 254         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 255         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 256         kfree(tbl.data);
 257         return ret;
 258 }
 259
 260 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 261                                            int write,
 262                                            void __user *buffer, size_t *lenp,
 263                                            loff_t *ppos)
 264 {
 265         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 266         int ret;
 267
 268         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 269         if (!tbl.data)
 270                 return -ENOMEM;
 271
 272         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 273         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 274         if (write && ret == 0)
 275                 ret = tcp_set_allowed_congestion_control(tbl.data);
 276         kfree(tbl.data);
 277         return ret;
 278 }
 279
 280 static int sscanf_key(char *buf, __le32 *key)
 281 {
 282         u32 user_key[4];
 283         int i, ret = 0;
 284
 285         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 286                    user_key + 2, user_key + 3) != 4) {
 287                 ret = -EINVAL;
 288         } else {
 289                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 290                         key[i] = cpu_to_le32(user_key[i]);
 291         }
 292         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 293                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 294
 295         return ret;
 296 }
 297
 298 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 299                                  void __user *buffer, size_t *lenp,
 300                                  loff_t *ppos)
 301 {
 302         struct net *net = container_of(table->data, struct net,
 303             ipv4.sysctl_tcp_fastopen);
 304         /* maxlen to print the list of keys in hex (*2), with dashes
 305          * separating doublewords and a comma in between keys.
 306          */
 307         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 308                                             2 * TCP_FASTOPEN_KEY_MAX) +
 309                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 310         struct tcp_fastopen_context *ctx;
 311         u32 user_key[TCP_FASTOPEN_KEY_MAX * 4];
 312         __le32 key[TCP_FASTOPEN_KEY_MAX * 4];
 313         char *backup_data;
 314         int ret, i = 0, off = 0, n_keys = 0;
 315
 316         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 317         if (!tbl.data)
 318                 return -ENOMEM;
 319
 320         rcu_read_lock();
 321         ctx = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 322         if (ctx) {
 323                 n_keys = tcp_fastopen_context_len(ctx);
 324                 memcpy(&key[0], &ctx->key[0], TCP_FASTOPEN_KEY_LENGTH * n_keys);
 325         }
 326         rcu_read_unlock();
 327
 328         if (!n_keys) {
 329                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 330                 n_keys = 1;
 331         }
 332
 333         for (i = 0; i < n_keys * 4; i++)
 334                 user_key[i] = le32_to_cpu(key[i]);
 335
 336         for (i = 0; i < n_keys; i++) {
 337                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 338                                 "%08x-%08x-%08x-%08x",
 339                                 user_key[i * 4],
 340                                 user_key[i * 4 + 1],
 341                                 user_key[i * 4 + 2],
 342                                 user_key[i * 4 + 3]);
 343                 if (i + 1 < n_keys)
 344                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 345         }
 346
 347         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 348
 349         if (write && ret == 0) {
 350                 backup_data = strchr(tbl.data, ',');
 351                 if (backup_data) {
 352                         *backup_data = '\0';
 353                         backup_data++;
 354                 }
 355                 if (sscanf_key(tbl.data, key)) {
 356                         ret = -EINVAL;
 357                         goto bad_key;
 358                 }
 359                 if (backup_data) {
 360                         if (sscanf_key(backup_data, key + 4)) {
 361                                 ret = -EINVAL;
 362                                 goto bad_key;
 363                         }
 364                 }
 365                 tcp_fastopen_reset_cipher(net, NULL, key,
 366                                           backup_data ? key + 4 : NULL,
 367                                           TCP_FASTOPEN_KEY_LENGTH);
 368         }
 369
 370 bad_key:
 371         kfree(tbl.data);
 372         return ret;
 373 }
 374
 375 static void proc_configure_early_demux(int enabled, int protocol)
 376 {
 377         struct net_protocol *ipprot;
 378 #if IS_ENABLED(CONFIG_IPV6)
 379         struct inet6_protocol *ip6prot;
 380 #endif
 381
 382         rcu_read_lock();
 383
 384         ipprot = rcu_dereference(inet_protos[protocol]);
 385         if (ipprot)
 386                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 387                                                 NULL;
 388
 389 #if IS_ENABLED(CONFIG_IPV6)
 390         ip6prot = rcu_dereference(inet6_protos[protocol]);
 391         if (ip6prot)
 392                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 393                                                  NULL;
 394 #endif
 395         rcu_read_unlock();
 396 }
 397
 398 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 399                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 400 {
 401         int ret = 0;
 402
 403         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 404
 405         if (write && !ret) {
 406                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 407
 408                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 409         }
 410
 411         return ret;
 412 }
 413
 414 static int proc_udp_early_demux(struct ctl_table *table, int write,
 415                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 416 {
 417         int ret = 0;
 418
 419         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 420
 421         if (write && !ret) {
 422                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 423
 424                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 425         }
 426
 427         return ret;
 428 }
 429
 430 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 431                                              int write,
 432                                              void __user *buffer,
 433                                              size_t *lenp, loff_t *ppos)
 434 {
 435         struct net *net = container_of(table->data, struct net,
 436             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 437         int ret;
 438
 439         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 440         if (write && ret == 0)
 441                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 442
 443         return ret;
 444 }
 445
 446 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 447                                   int write,
 448                                   void __user *buffer, size_t *lenp,
 449                                   loff_t *ppos)
 450 {
 451         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 452         int ret;
 453
 454         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 455         if (!tbl.data)
 456                 return -ENOMEM;
 457         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 458         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 459         kfree(tbl.data);
 460
 461         return ret;
 462 }
 463
 464 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 465 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 466                                           void __user *buffer, size_t *lenp,
 467                                           loff_t *ppos)
 468 {
 469         struct net *net = container_of(table->data, struct net,
 470             ipv4.sysctl_fib_multipath_hash_policy);
 471         int ret;
 472
 473         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 474         if (write && ret == 0)
 475                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 476
 477         return ret;
 478 }
 479 #endif
 480
 481 static struct ctl_table ipv4_table[] = {
 482         {
 483                 .procname       = "tcp_max_orphans",
 484                 .data           = &sysctl_tcp_max_orphans,
 485                 .maxlen         = sizeof(int),
 486                 .mode           = 0644,
 487                 .proc_handler   = proc_dointvec
 488         },
 489         {
 490                 .procname       = "inet_peer_threshold",
 491                 .data           = &inet_peer_threshold,
 492                 .maxlen         = sizeof(int),
 493                 .mode           = 0644,
 494                 .proc_handler   = proc_dointvec
 495         },
 496         {
 497                 .procname       = "inet_peer_minttl",
 498                 .data           = &inet_peer_minttl,
 499                 .maxlen         = sizeof(int),
 500                 .mode           = 0644,
 501                 .proc_handler   = proc_dointvec_jiffies,
 502         },
 503         {
 504                 .procname       = "inet_peer_maxttl",
 505                 .data           = &inet_peer_maxttl,
 506                 .maxlen         = sizeof(int),
 507                 .mode           = 0644,
 508                 .proc_handler   = proc_dointvec_jiffies,
 509         },
 510         {
 511                 .procname       = "tcp_mem",
 512                 .maxlen         = sizeof(sysctl_tcp_mem),
 513                 .data           = &sysctl_tcp_mem,
 514                 .mode           = 0644,
 515                 .proc_handler   = proc_doulongvec_minmax,
 516         },
 517         {
 518                 .procname       = "tcp_low_latency",
 519                 .data           = &sysctl_tcp_low_latency,
 520                 .maxlen         = sizeof(int),
 521                 .mode           = 0644,
 522                 .proc_handler   = proc_dointvec
 523         },
 524 #ifdef CONFIG_NETLABEL
 525         {
 526                 .procname       = "cipso_cache_enable",
 527                 .data           = &cipso_v4_cache_enabled,
 528                 .maxlen         = sizeof(int),
 529                 .mode           = 0644,
 530                 .proc_handler   = proc_dointvec,
 531         },
 532         {
 533                 .procname       = "cipso_cache_bucket_size",
 534                 .data           = &cipso_v4_cache_bucketsize,
 535                 .maxlen         = sizeof(int),
 536                 .mode           = 0644,
 537                 .proc_handler   = proc_dointvec,
 538         },
 539         {
 540                 .procname       = "cipso_rbm_optfmt",
 541                 .data           = &cipso_v4_rbm_optfmt,
 542                 .maxlen         = sizeof(int),
 543                 .mode           = 0644,
 544                 .proc_handler   = proc_dointvec,
 545         },
 546         {
 547                 .procname       = "cipso_rbm_strictvalid",
 548                 .data           = &cipso_v4_rbm_strictvalid,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = proc_dointvec,
 552         },
 553 #endif /* CONFIG_NETLABEL */
 554         {
 555                 .procname       = "tcp_available_congestion_control",
 556                 .maxlen         = TCP_CA_BUF_MAX,
 557                 .mode           = 0444,
 558                 .proc_handler   = proc_tcp_available_congestion_control,
 559         },
 560         {
 561                 .procname       = "tcp_allowed_congestion_control",
 562                 .maxlen         = TCP_CA_BUF_MAX,
 563                 .mode           = 0644,
 564                 .proc_handler   = proc_allowed_congestion_control,
 565         },
 566         {
 567                 .procname       = "tcp_available_ulp",
 568                 .maxlen         = TCP_ULP_BUF_MAX,
 569                 .mode           = 0444,
 570                 .proc_handler   = proc_tcp_available_ulp,
 571         },
 572         {
 573                 .procname       = "icmp_msgs_per_sec",
 574                 .data           = &sysctl_icmp_msgs_per_sec,
 575                 .maxlen         = sizeof(int),
 576                 .mode           = 0644,
 577                 .proc_handler   = proc_dointvec_minmax,
 578                 .extra1         = &zero,
 579         },
 580         {
 581                 .procname       = "icmp_msgs_burst",
 582                 .data           = &sysctl_icmp_msgs_burst,
 583                 .maxlen         = sizeof(int),
 584                 .mode           = 0644,
 585                 .proc_handler   = proc_dointvec_minmax,
 586                 .extra1         = &zero,
 587         },
 588         {
 589                 .procname       = "udp_mem",
 590                 .data           = &sysctl_udp_mem,
 591                 .maxlen         = sizeof(sysctl_udp_mem),
 592                 .mode           = 0644,
 593                 .proc_handler   = proc_doulongvec_minmax,
 594         },
 595         {
 596                 .procname       = "fib_sync_mem",
 597                 .data           = &sysctl_fib_sync_mem,
 598                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 599                 .mode           = 0644,
 600                 .proc_handler   = proc_douintvec_minmax,
 601                 .extra1         = &sysctl_fib_sync_mem_min,
 602                 .extra2         = &sysctl_fib_sync_mem_max,
 603         },
 604         { }
 605 };
 606
 607 static struct ctl_table ipv4_net_table[] = {
 608         {
 609                 .procname       = "icmp_echo_ignore_all",
 610                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 611                 .maxlen         = sizeof(int),
 612                 .mode           = 0644,
 613                 .proc_handler   = proc_dointvec
 614         },
 615         {
 616                 .procname       = "icmp_echo_ignore_broadcasts",
 617                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 618                 .maxlen         = sizeof(int),
 619                 .mode           = 0644,
 620                 .proc_handler   = proc_dointvec
 621         },
 622         {
 623                 .procname       = "icmp_ignore_bogus_error_responses",
 624                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 625                 .maxlen         = sizeof(int),
 626                 .mode           = 0644,
 627                 .proc_handler   = proc_dointvec
 628         },
 629         {
 630                 .procname       = "icmp_errors_use_inbound_ifaddr",
 631                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 632                 .maxlen         = sizeof(int),
 633                 .mode           = 0644,
 634                 .proc_handler   = proc_dointvec
 635         },
 636         {
 637                 .procname       = "icmp_ratelimit",
 638                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 .proc_handler   = proc_dointvec_ms_jiffies,
 642         },
 643         {
 644                 .procname       = "icmp_ratemask",
 645                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 646                 .maxlen         = sizeof(int),
 647                 .mode           = 0644,
 648                 .proc_handler   = proc_dointvec
 649         },
 650         {
 651                 .procname       = "ping_group_range",
 652                 .data           = &init_net.ipv4.ping_group_range.range,
 653                 .maxlen         = sizeof(gid_t)*2,
 654                 .mode           = 0644,
 655                 .proc_handler   = ipv4_ping_group_range,
 656         },
 657 #ifdef CONFIG_NET_L3_MASTER_DEV
 658         {
 659                 .procname       = "raw_l3mdev_accept",
 660                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 661                 .maxlen         = sizeof(int),
 662                 .mode           = 0644,
 663                 .proc_handler   = proc_dointvec_minmax,
 664                 .extra1         = &zero,
 665                 .extra2         = &one,
 666         },
 667 #endif
 668         {
 669                 .procname       = "tcp_ecn",
 670                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 671                 .maxlen         = sizeof(int),
 672                 .mode           = 0644,
 673                 .proc_handler   = proc_dointvec
 674         },
 675         {
 676                 .procname       = "tcp_ecn_fallback",
 677                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 678                 .maxlen         = sizeof(int),
 679                 .mode           = 0644,
 680                 .proc_handler   = proc_dointvec
 681         },
 682         {
 683                 .procname       = "ip_dynaddr",
 684                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 685                 .maxlen         = sizeof(int),
 686                 .mode           = 0644,
 687                 .proc_handler   = proc_dointvec
 688         },
 689         {
 690                 .procname       = "ip_early_demux",
 691                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 692                 .maxlen         = sizeof(int),
 693                 .mode           = 0644,
 694                 .proc_handler   = proc_dointvec
 695         },
 696         {
 697                 .procname       = "udp_early_demux",
 698                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 699                 .maxlen         = sizeof(int),
 700                 .mode           = 0644,
 701                 .proc_handler   = proc_udp_early_demux
 702         },
 703         {
 704                 .procname       = "tcp_early_demux",
 705                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 706                 .maxlen         = sizeof(int),
 707                 .mode           = 0644,
 708                 .proc_handler   = proc_tcp_early_demux
 709         },
 710         {
 711                 .procname       = "ip_default_ttl",
 712                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 713                 .maxlen         = sizeof(int),
 714                 .mode           = 0644,
 715                 .proc_handler   = proc_dointvec_minmax,
 716                 .extra1         = &ip_ttl_min,
 717                 .extra2         = &ip_ttl_max,
 718         },
 719         {
 720                 .procname       = "ip_local_port_range",
 721                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 722                 .data           = &init_net.ipv4.ip_local_ports.range,
 723                 .mode           = 0644,
 724                 .proc_handler   = ipv4_local_port_range,
 725         },
 726         {
 727                 .procname       = "ip_local_reserved_ports",
 728                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 729                 .maxlen         = 65536,
 730                 .mode           = 0644,
 731                 .proc_handler   = proc_do_large_bitmap,
 732         },
 733         {
 734                 .procname       = "ip_no_pmtu_disc",
 735                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 736                 .maxlen         = sizeof(int),
 737                 .mode           = 0644,
 738                 .proc_handler   = proc_dointvec
 739         },
 740         {
 741                 .procname       = "ip_forward_use_pmtu",
 742                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 743                 .maxlen         = sizeof(int),
 744                 .mode           = 0644,
 745                 .proc_handler   = proc_dointvec,
 746         },
 747         {
 748                 .procname       = "ip_forward_update_priority",
 749                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 750                 .maxlen         = sizeof(int),
 751                 .mode           = 0644,
 752                 .proc_handler   = ipv4_fwd_update_priority,
 753                 .extra1         = &zero,
 754                 .extra2         = &one,
 755         },
 756         {
 757                 .procname       = "ip_nonlocal_bind",
 758                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 759                 .maxlen         = sizeof(int),
 760                 .mode           = 0644,
 761                 .proc_handler   = proc_dointvec
 762         },
 763         {
 764                 .procname       = "fwmark_reflect",
 765                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 766                 .maxlen         = sizeof(int),
 767                 .mode           = 0644,
 768                 .proc_handler   = proc_dointvec,
 769         },
 770         {
 771                 .procname       = "tcp_fwmark_accept",
 772                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 773                 .maxlen         = sizeof(int),
 774                 .mode           = 0644,
 775                 .proc_handler   = proc_dointvec,
 776         },
 777 #ifdef CONFIG_NET_L3_MASTER_DEV
 778         {
 779                 .procname       = "tcp_l3mdev_accept",
 780                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 781                 .maxlen         = sizeof(int),
 782                 .mode           = 0644,
 783                 .proc_handler   = proc_dointvec_minmax,
 784                 .extra1         = &zero,
 785                 .extra2         = &one,
 786         },
 787 #endif
 788         {
 789                 .procname       = "tcp_mtu_probing",
 790                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 791                 .maxlen         = sizeof(int),
 792                 .mode           = 0644,
 793                 .proc_handler   = proc_dointvec,
 794         },
 795         {
 796                 .procname       = "tcp_base_mss",
 797                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 798                 .maxlen         = sizeof(int),
 799                 .mode           = 0644,
 800                 .proc_handler   = proc_dointvec,
 801         },
 802         {
 803                 .procname       = "tcp_probe_threshold",
 804                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 805                 .maxlen         = sizeof(int),
 806                 .mode           = 0644,
 807                 .proc_handler   = proc_dointvec,
 808         },
 809         {
 810                 .procname       = "tcp_probe_interval",
 811                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 812                 .maxlen         = sizeof(u32),
 813                 .mode           = 0644,
 814                 .proc_handler   = proc_douintvec_minmax,
 815                 .extra2         = &u32_max_div_HZ,
 816         },
 817         {
 818                 .procname       = "igmp_link_local_mcast_reports",
 819                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 820                 .maxlen         = sizeof(int),
 821                 .mode           = 0644,
 822                 .proc_handler   = proc_dointvec
 823         },
 824         {
 825                 .procname       = "igmp_max_memberships",
 826                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = proc_dointvec
 830         },
 831         {
 832                 .procname       = "igmp_max_msf",
 833                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 834                 .maxlen         = sizeof(int),
 835                 .mode           = 0644,
 836                 .proc_handler   = proc_dointvec
 837         },
 838 #ifdef CONFIG_IP_MULTICAST
 839         {
 840                 .procname       = "igmp_qrv",
 841                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 842                 .maxlen         = sizeof(int),
 843                 .mode           = 0644,
 844                 .proc_handler   = proc_dointvec_minmax,
 845                 .extra1         = &one
 846         },
 847 #endif
 848         {
 849                 .procname       = "tcp_congestion_control",
 850                 .data           = &init_net.ipv4.tcp_congestion_control,
 851                 .mode           = 0644,
 852                 .maxlen         = TCP_CA_NAME_MAX,
 853                 .proc_handler   = proc_tcp_congestion_control,
 854         },
 855         {
 856                 .procname       = "tcp_keepalive_time",
 857                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 858                 .maxlen         = sizeof(int),
 859                 .mode           = 0644,
 860                 .proc_handler   = proc_dointvec_jiffies,
 861         },
 862         {
 863                 .procname       = "tcp_keepalive_probes",
 864                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 865                 .maxlen         = sizeof(int),
 866                 .mode           = 0644,
 867                 .proc_handler   = proc_dointvec
 868         },
 869         {
 870                 .procname       = "tcp_keepalive_intvl",
 871                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 872                 .maxlen         = sizeof(int),
 873                 .mode           = 0644,
 874                 .proc_handler   = proc_dointvec_jiffies,
 875         },
 876         {
 877                 .procname       = "tcp_syn_retries",
 878                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 879                 .maxlen         = sizeof(int),
 880                 .mode           = 0644,
 881                 .proc_handler   = proc_dointvec_minmax,
 882                 .extra1         = &tcp_syn_retries_min,
 883                 .extra2         = &tcp_syn_retries_max
 884         },
 885         {
 886                 .procname       = "tcp_synack_retries",
 887                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 888                 .maxlen         = sizeof(int),
 889                 .mode           = 0644,
 890                 .proc_handler   = proc_dointvec
 891         },
 892 #ifdef CONFIG_SYN_COOKIES
 893         {
 894                 .procname       = "tcp_syncookies",
 895                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 896                 .maxlen         = sizeof(int),
 897                 .mode           = 0644,
 898                 .proc_handler   = proc_dointvec
 899         },
 900 #endif
 901         {
 902                 .procname       = "tcp_reordering",
 903                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 904                 .maxlen         = sizeof(int),
 905                 .mode           = 0644,
 906                 .proc_handler   = proc_dointvec
 907         },
 908         {
 909                 .procname       = "tcp_retries1",
 910                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 911                 .maxlen         = sizeof(int),
 912                 .mode           = 0644,
 913                 .proc_handler   = proc_dointvec_minmax,
 914                 .extra2         = &tcp_retr1_max
 915         },
 916         {
 917                 .procname       = "tcp_retries2",
 918                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 919                 .maxlen         = sizeof(int),
 920                 .mode           = 0644,
 921                 .proc_handler   = proc_dointvec
 922         },
 923         {
 924                 .procname       = "tcp_orphan_retries",
 925                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 926                 .maxlen         = sizeof(int),
 927                 .mode           = 0644,
 928                 .proc_handler   = proc_dointvec
 929         },
 930         {
 931                 .procname       = "tcp_fin_timeout",
 932                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 933                 .maxlen         = sizeof(int),
 934                 .mode           = 0644,
 935                 .proc_handler   = proc_dointvec_jiffies,
 936         },
 937         {
 938                 .procname       = "tcp_notsent_lowat",
 939                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 940                 .maxlen         = sizeof(unsigned int),
 941                 .mode           = 0644,
 942                 .proc_handler   = proc_douintvec,
 943         },
 944         {
 945                 .procname       = "tcp_tw_reuse",
 946                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 947                 .maxlen         = sizeof(int),
 948                 .mode           = 0644,
 949                 .proc_handler   = proc_dointvec_minmax,
 950                 .extra1         = &zero,
 951                 .extra2         = &two,
 952         },
 953         {
 954                 .procname       = "tcp_max_tw_buckets",
 955                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 956                 .maxlen         = sizeof(int),
 957                 .mode           = 0644,
 958                 .proc_handler   = proc_dointvec
 959         },
 960         {
 961                 .procname       = "tcp_max_syn_backlog",
 962                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 963                 .maxlen         = sizeof(int),
 964                 .mode           = 0644,
 965                 .proc_handler   = proc_dointvec
 966         },
 967         {
 968                 .procname       = "tcp_fastopen",
 969                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 970                 .maxlen         = sizeof(int),
 971                 .mode           = 0644,
 972                 .proc_handler   = proc_dointvec,
 973         },
 974         {
 975                 .procname       = "tcp_fastopen_key",
 976                 .mode           = 0600,
 977                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 978                 /* maxlen to print the list of keys in hex (*2), with dashes
 979                  * separating doublewords and a comma in between keys.
 980                  */
 981                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
 982                                    2 * TCP_FASTOPEN_KEY_MAX) +
 983                                    (TCP_FASTOPEN_KEY_MAX * 5)),
 984                 .proc_handler   = proc_tcp_fastopen_key,
 985         },
 986         {
 987                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
 988                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
 989                 .maxlen         = sizeof(int),
 990                 .mode           = 0644,
 991                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
 992                 .extra1         = &zero,
 993         },
 994 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 995         {
 996                 .procname       = "fib_multipath_use_neigh",
 997                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
 998                 .maxlen         = sizeof(int),
 999                 .mode           = 0644,
1000                 .proc_handler   = proc_dointvec_minmax,
1001                 .extra1         = &zero,
1002                 .extra2         = &one,
1003         },
1004         {
1005                 .procname       = "fib_multipath_hash_policy",
1006                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1007                 .maxlen         = sizeof(int),
1008                 .mode           = 0644,
1009                 .proc_handler   = proc_fib_multipath_hash_policy,
1010                 .extra1         = &zero,
1011                 .extra2         = &two,
1012         },
1013 #endif
1014         {
1015                 .procname       = "ip_unprivileged_port_start",
1016                 .maxlen         = sizeof(int),
1017                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1018                 .mode           = 0644,
1019                 .proc_handler   = ipv4_privileged_ports,
1020         },
1021 #ifdef CONFIG_NET_L3_MASTER_DEV
1022         {
1023                 .procname       = "udp_l3mdev_accept",
1024                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1025                 .maxlen         = sizeof(int),
1026                 .mode           = 0644,
1027                 .proc_handler   = proc_dointvec_minmax,
1028                 .extra1         = &zero,
1029                 .extra2         = &one,
1030         },
1031 #endif
1032         {
1033                 .procname       = "tcp_sack",
1034                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1035                 .maxlen         = sizeof(int),
1036                 .mode           = 0644,
1037                 .proc_handler   = proc_dointvec
1038         },
1039         {
1040                 .procname       = "tcp_window_scaling",
1041                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1042                 .maxlen         = sizeof(int),
1043                 .mode           = 0644,
1044                 .proc_handler   = proc_dointvec
1045         },
1046         {
1047                 .procname       = "tcp_timestamps",
1048                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1049                 .maxlen         = sizeof(int),
1050                 .mode           = 0644,
1051                 .proc_handler   = proc_dointvec
1052         },
1053         {
1054                 .procname       = "tcp_early_retrans",
1055                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1056                 .maxlen         = sizeof(int),
1057                 .mode           = 0644,
1058                 .proc_handler   = proc_dointvec_minmax,
1059                 .extra1         = &zero,
1060                 .extra2         = &four,
1061         },
1062         {
1063                 .procname       = "tcp_recovery",
1064                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1065                 .maxlen         = sizeof(int),
1066                 .mode           = 0644,
1067                 .proc_handler   = proc_dointvec,
1068         },
1069         {
1070                 .procname       = "tcp_thin_linear_timeouts",
1071                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1072                 .maxlen         = sizeof(int),
1073                 .mode           = 0644,
1074                 .proc_handler   = proc_dointvec
1075         },
1076         {
1077                 .procname       = "tcp_slow_start_after_idle",
1078                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1079                 .maxlen         = sizeof(int),
1080                 .mode           = 0644,
1081                 .proc_handler   = proc_dointvec
1082         },
1083         {
1084                 .procname       = "tcp_retrans_collapse",
1085                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1086                 .maxlen         = sizeof(int),
1087                 .mode           = 0644,
1088                 .proc_handler   = proc_dointvec
1089         },
1090         {
1091                 .procname       = "tcp_stdurg",
1092                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1093                 .maxlen         = sizeof(int),
1094                 .mode           = 0644,
1095                 .proc_handler   = proc_dointvec
1096         },
1097         {
1098                 .procname       = "tcp_rfc1337",
1099                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1100                 .maxlen         = sizeof(int),
1101                 .mode           = 0644,
1102                 .proc_handler   = proc_dointvec
1103         },
1104         {
1105                 .procname       = "tcp_abort_on_overflow",
1106                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1107                 .maxlen         = sizeof(int),
1108                 .mode           = 0644,
1109                 .proc_handler   = proc_dointvec
1110         },
1111         {
1112                 .procname       = "tcp_fack",
1113                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1114                 .maxlen         = sizeof(int),
1115                 .mode           = 0644,
1116                 .proc_handler   = proc_dointvec
1117         },
1118         {
1119                 .procname       = "tcp_max_reordering",
1120                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1121                 .maxlen         = sizeof(int),
1122                 .mode           = 0644,
1123                 .proc_handler   = proc_dointvec
1124         },
1125         {
1126                 .procname       = "tcp_dsack",
1127                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1128                 .maxlen         = sizeof(int),
1129                 .mode           = 0644,
1130                 .proc_handler   = proc_dointvec
1131         },
1132         {
1133                 .procname       = "tcp_app_win",
1134                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1135                 .maxlen         = sizeof(int),
1136                 .mode           = 0644,
1137                 .proc_handler   = proc_dointvec
1138         },
1139         {
1140                 .procname       = "tcp_adv_win_scale",
1141                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1142                 .maxlen         = sizeof(int),
1143                 .mode           = 0644,
1144                 .proc_handler   = proc_dointvec_minmax,
1145                 .extra1         = &tcp_adv_win_scale_min,
1146                 .extra2         = &tcp_adv_win_scale_max,
1147         },
1148         {
1149                 .procname       = "tcp_frto",
1150                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1151                 .maxlen         = sizeof(int),
1152                 .mode           = 0644,
1153                 .proc_handler   = proc_dointvec
1154         },
1155         {
1156                 .procname       = "tcp_no_metrics_save",
1157                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1158                 .maxlen         = sizeof(int),
1159                 .mode           = 0644,
1160                 .proc_handler   = proc_dointvec,
1161         },
1162         {
1163                 .procname       = "tcp_moderate_rcvbuf",
1164                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1165                 .maxlen         = sizeof(int),
1166                 .mode           = 0644,
1167                 .proc_handler   = proc_dointvec,
1168         },
1169         {
1170                 .procname       = "tcp_tso_win_divisor",
1171                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1172                 .maxlen         = sizeof(int),
1173                 .mode           = 0644,
1174                 .proc_handler   = proc_dointvec,
1175         },
1176         {
1177                 .procname       = "tcp_workaround_signed_windows",
1178                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1179                 .maxlen         = sizeof(int),
1180                 .mode           = 0644,
1181                 .proc_handler   = proc_dointvec
1182         },
1183         {
1184                 .procname       = "tcp_limit_output_bytes",
1185                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1186                 .maxlen         = sizeof(int),
1187                 .mode           = 0644,
1188                 .proc_handler   = proc_dointvec
1189         },
1190         {
1191                 .procname       = "tcp_challenge_ack_limit",
1192                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1193                 .maxlen         = sizeof(int),
1194                 .mode           = 0644,
1195                 .proc_handler   = proc_dointvec
1196         },
1197         {
1198                 .procname       = "tcp_min_tso_segs",
1199                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1200                 .maxlen         = sizeof(int),
1201                 .mode           = 0644,
1202                 .proc_handler   = proc_dointvec_minmax,
1203                 .extra1         = &one,
1204                 .extra2         = &gso_max_segs,
1205         },
1206         {
1207                 .procname       = "tcp_min_rtt_wlen",
1208                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1209                 .maxlen         = sizeof(int),
1210                 .mode           = 0644,
1211                 .proc_handler   = proc_dointvec_minmax,
1212                 .extra1         = &zero,
1213                 .extra2         = &one_day_secs
1214         },
1215         {
1216                 .procname       = "tcp_autocorking",
1217                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1218                 .maxlen         = sizeof(int),
1219                 .mode           = 0644,
1220                 .proc_handler   = proc_dointvec_minmax,
1221                 .extra1         = &zero,
1222                 .extra2         = &one,
1223         },
1224         {
1225                 .procname       = "tcp_invalid_ratelimit",
1226                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1227                 .maxlen         = sizeof(int),
1228                 .mode           = 0644,
1229                 .proc_handler   = proc_dointvec_ms_jiffies,
1230         },
1231         {
1232                 .procname       = "tcp_pacing_ss_ratio",
1233                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1234                 .maxlen         = sizeof(int),
1235                 .mode           = 0644,
1236                 .proc_handler   = proc_dointvec_minmax,
1237                 .extra1         = &zero,
1238                 .extra2         = &thousand,
1239         },
1240         {
1241                 .procname       = "tcp_pacing_ca_ratio",
1242                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1243                 .maxlen         = sizeof(int),
1244                 .mode           = 0644,
1245                 .proc_handler   = proc_dointvec_minmax,
1246                 .extra1         = &zero,
1247                 .extra2         = &thousand,
1248         },
1249         {
1250                 .procname       = "tcp_wmem",
1251                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1252                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1253                 .mode           = 0644,
1254                 .proc_handler   = proc_dointvec_minmax,
1255                 .extra1         = &one,
1256         },
1257         {
1258                 .procname       = "tcp_rmem",
1259                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1260                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1261                 .mode           = 0644,
1262                 .proc_handler   = proc_dointvec_minmax,
1263                 .extra1         = &one,
1264         },
1265         {
1266                 .procname       = "tcp_comp_sack_delay_ns",
1267                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1268                 .maxlen         = sizeof(unsigned long),
1269                 .mode           = 0644,
1270                 .proc_handler   = proc_doulongvec_minmax,
1271         },
1272         {
1273                 .procname       = "tcp_comp_sack_nr",
1274                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1275                 .maxlen         = sizeof(int),
1276                 .mode           = 0644,
1277                 .proc_handler   = proc_dointvec_minmax,
1278                 .extra1         = &zero,
1279                 .extra2         = &comp_sack_nr_max,
1280         },
1281         {
1282                 .procname       = "udp_rmem_min",
1283                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1284                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1285                 .mode           = 0644,
1286                 .proc_handler   = proc_dointvec_minmax,
1287                 .extra1         = &one
1288         },
1289         {
1290                 .procname       = "udp_wmem_min",
1291                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1292                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1293                 .mode           = 0644,
1294                 .proc_handler   = proc_dointvec_minmax,
1295                 .extra1         = &one
1296         },
1297         { }
1298 };
1299
1300 static __net_init int ipv4_sysctl_init_net(struct net *net)
1301 {
1302         struct ctl_table *table;
1303
1304         table = ipv4_net_table;
1305         if (!net_eq(net, &init_net)) {
1306                 int i;
1307
1308                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1309                 if (!table)
1310                         goto err_alloc;
1311
1312                 /* Update the variables to point into the current struct net */
1313                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1314                         table[i].data += (void *)net - (void *)&init_net;
1315         }
1316
1317         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1318         if (!net->ipv4.ipv4_hdr)
1319                 goto err_reg;
1320
1321         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1322         if (!net->ipv4.sysctl_local_reserved_ports)
1323                 goto err_ports;
1324
1325         return 0;
1326
1327 err_ports:
1328         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1329 err_reg:
1330         if (!net_eq(net, &init_net))
1331                 kfree(table);
1332 err_alloc:
1333         return -ENOMEM;
1334 }
1335
1336 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1337 {
1338         struct ctl_table *table;
1339
1340         kfree(net->ipv4.sysctl_local_reserved_ports);
1341         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1342         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1343         kfree(table);
1344 }
1345
1346 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1347         .init = ipv4_sysctl_init_net,
1348         .exit = ipv4_sysctl_exit_net,
1349 };
1350
1351 static __init int sysctl_ipv4_init(void)
1352 {
1353         struct ctl_table_header *hdr;
1354
1355         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1356         if (!hdr)
1357                 return -ENOMEM;
1358
1359         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1360                 unregister_net_sysctl_table(hdr);
1361                 return -ENOMEM;
1362         }
1363
1364         return 0;
1365 }
1366
1367 __initcall(sysctl_ipv4_init);