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 two = 2;
  32 static int four = 4;
  33 static int thousand = 1000;
  34 static int tcp_retr1_max = 255;
  35 static int ip_local_port_range_min[] = { 1, 1 };
  36 static int ip_local_port_range_max[] = { 65535, 65535 };
  37 static int tcp_adv_win_scale_min = -31;
  38 static int tcp_adv_win_scale_max = 31;
  39 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  40 static int tcp_min_snd_mss_max = 65535;
  41 static int ip_privileged_port_min;
  42 static int ip_privileged_port_max = 65535;
  43 static int ip_ttl_min = 1;
  44 static int ip_ttl_max = 255;
  45 static int tcp_syn_retries_min = 1;
  46 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  47 static int ip_ping_group_range_min[] = { 0, 0 };
  48 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  49 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  50 static int one_day_secs = 24 * 3600;
  51
  52 /* obsolete */
  53 static int sysctl_tcp_low_latency __read_mostly;
  54
  55 /* Update system visible IP port range */
  56 static void set_local_port_range(struct net *net, int range[2])
  57 {
  58         bool same_parity = !((range[0] ^ range[1]) & 1);
  59
  60         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  61         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  62                 net->ipv4.ip_local_ports.warned = true;
  63                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  64         }
  65         net->ipv4.ip_local_ports.range[0] = range[0];
  66         net->ipv4.ip_local_ports.range[1] = range[1];
  67         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  68 }
  69
  70 /* Validate changes from /proc interface. */
  71 static int ipv4_local_port_range(struct ctl_table *table, int write,
  72                                  void *buffer, size_t *lenp, loff_t *ppos)
  73 {
  74         struct net *net =
  75                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  76         int ret;
  77         int range[2];
  78         struct ctl_table tmp = {
  79                 .data = &range,
  80                 .maxlen = sizeof(range),
  81                 .mode = table->mode,
  82                 .extra1 = &ip_local_port_range_min,
  83                 .extra2 = &ip_local_port_range_max,
  84         };
  85
  86         inet_get_local_port_range(net, &range[0], &range[1]);
  87
  88         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  89
  90         if (write && ret == 0) {
  91                 /* Ensure that the upper limit is not smaller than the lower,
  92                  * and that the lower does not encroach upon the privileged
  93                  * port limit.
  94                  */
  95                 if ((range[1] < range[0]) ||
  96                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
  97                         ret = -EINVAL;
  98                 else
  99                         set_local_port_range(net, range);
 100         }
 101
 102         return ret;
 103 }
 104
 105 /* Validate changes from /proc interface. */
 106 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 107                                 void *buffer, size_t *lenp, loff_t *ppos)
 108 {
 109         struct net *net = container_of(table->data, struct net,
 110             ipv4.sysctl_ip_prot_sock);
 111         int ret;
 112         int pports;
 113         int range[2];
 114         struct ctl_table tmp = {
 115                 .data = &pports,
 116                 .maxlen = sizeof(pports),
 117                 .mode = table->mode,
 118                 .extra1 = &ip_privileged_port_min,
 119                 .extra2 = &ip_privileged_port_max,
 120         };
 121
 122         pports = net->ipv4.sysctl_ip_prot_sock;
 123
 124         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 125
 126         if (write && ret == 0) {
 127                 inet_get_local_port_range(net, &range[0], &range[1]);
 128                 /* Ensure that the local port range doesn't overlap with the
 129                  * privileged port range.
 130                  */
 131                 if (range[0] < pports)
 132                         ret = -EINVAL;
 133                 else
 134                         net->ipv4.sysctl_ip_prot_sock = pports;
 135         }
 136
 137         return ret;
 138 }
 139
 140 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 141 {
 142         kgid_t *data = table->data;
 143         struct net *net =
 144                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 145         unsigned int seq;
 146         do {
 147                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 148
 149                 *low = data[0];
 150                 *high = data[1];
 151         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 152 }
 153
 154 /* Update system visible IP port range */
 155 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 156 {
 157         kgid_t *data = table->data;
 158         struct net *net =
 159                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 160         write_seqlock(&net->ipv4.ping_group_range.lock);
 161         data[0] = low;
 162         data[1] = high;
 163         write_sequnlock(&net->ipv4.ping_group_range.lock);
 164 }
 165
 166 /* Validate changes from /proc interface. */
 167 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 168                                  void *buffer, size_t *lenp, loff_t *ppos)
 169 {
 170         struct user_namespace *user_ns = current_user_ns();
 171         int ret;
 172         gid_t urange[2];
 173         kgid_t low, high;
 174         struct ctl_table tmp = {
 175                 .data = &urange,
 176                 .maxlen = sizeof(urange),
 177                 .mode = table->mode,
 178                 .extra1 = &ip_ping_group_range_min,
 179                 .extra2 = &ip_ping_group_range_max,
 180         };
 181
 182         inet_get_ping_group_range_table(table, &low, &high);
 183         urange[0] = from_kgid_munged(user_ns, low);
 184         urange[1] = from_kgid_munged(user_ns, high);
 185         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 186
 187         if (write && ret == 0) {
 188                 low = make_kgid(user_ns, urange[0]);
 189                 high = make_kgid(user_ns, urange[1]);
 190                 if (!gid_valid(low) || !gid_valid(high))
 191                         return -EINVAL;
 192                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 193                         low = make_kgid(&init_user_ns, 1);
 194                         high = make_kgid(&init_user_ns, 0);
 195                 }
 196                 set_ping_group_range(table, low, high);
 197         }
 198
 199         return ret;
 200 }
 201
 202 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 203                                     void *buffer, size_t *lenp, loff_t *ppos)
 204 {
 205         struct net *net;
 206         int ret;
 207
 208         net = container_of(table->data, struct net,
 209                            ipv4.sysctl_ip_fwd_update_priority);
 210         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 211         if (write && ret == 0)
 212                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 213                                         net);
 214
 215         return ret;
 216 }
 217
 218 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 219                                        void *buffer, size_t *lenp, loff_t *ppos)
 220 {
 221         struct net *net = container_of(ctl->data, struct net,
 222                                        ipv4.tcp_congestion_control);
 223         char val[TCP_CA_NAME_MAX];
 224         struct ctl_table tbl = {
 225                 .data = val,
 226                 .maxlen = TCP_CA_NAME_MAX,
 227         };
 228         int ret;
 229
 230         tcp_get_default_congestion_control(net, val);
 231
 232         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 233         if (write && ret == 0)
 234                 ret = tcp_set_default_congestion_control(net, val);
 235         return ret;
 236 }
 237
 238 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 239                                                  int write, void *buffer,
 240                                                  size_t *lenp, loff_t *ppos)
 241 {
 242         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 243         int ret;
 244
 245         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 246         if (!tbl.data)
 247                 return -ENOMEM;
 248         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 249         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 250         kfree(tbl.data);
 251         return ret;
 252 }
 253
 254 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 255                                            int write, void *buffer,
 256                                            size_t *lenp, loff_t *ppos)
 257 {
 258         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 259         int ret;
 260
 261         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 262         if (!tbl.data)
 263                 return -ENOMEM;
 264
 265         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 266         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 267         if (write && ret == 0)
 268                 ret = tcp_set_allowed_congestion_control(tbl.data);
 269         kfree(tbl.data);
 270         return ret;
 271 }
 272
 273 static int sscanf_key(char *buf, __le32 *key)
 274 {
 275         u32 user_key[4];
 276         int i, ret = 0;
 277
 278         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 279                    user_key + 2, user_key + 3) != 4) {
 280                 ret = -EINVAL;
 281         } else {
 282                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 283                         key[i] = cpu_to_le32(user_key[i]);
 284         }
 285         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 286                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 287
 288         return ret;
 289 }
 290
 291 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 292                                  void *buffer, size_t *lenp, loff_t *ppos)
 293 {
 294         struct net *net = container_of(table->data, struct net,
 295             ipv4.sysctl_tcp_fastopen);
 296         /* maxlen to print the list of keys in hex (*2), with dashes
 297          * separating doublewords and a comma in between keys.
 298          */
 299         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 300                                             2 * TCP_FASTOPEN_KEY_MAX) +
 301                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 302         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 303         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 304         char *backup_data;
 305         int ret, i = 0, off = 0, n_keys;
 306
 307         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 308         if (!tbl.data)
 309                 return -ENOMEM;
 310
 311         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 312         if (!n_keys) {
 313                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 314                 n_keys = 1;
 315         }
 316
 317         for (i = 0; i < n_keys * 4; i++)
 318                 user_key[i] = le32_to_cpu(key[i]);
 319
 320         for (i = 0; i < n_keys; i++) {
 321                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 322                                 "%08x-%08x-%08x-%08x",
 323                                 user_key[i * 4],
 324                                 user_key[i * 4 + 1],
 325                                 user_key[i * 4 + 2],
 326                                 user_key[i * 4 + 3]);
 327
 328                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 329                         break;
 330
 331                 if (i + 1 < n_keys)
 332                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 333         }
 334
 335         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 336
 337         if (write && ret == 0) {
 338                 backup_data = strchr(tbl.data, ',');
 339                 if (backup_data) {
 340                         *backup_data = '\0';
 341                         backup_data++;
 342                 }
 343                 if (sscanf_key(tbl.data, key)) {
 344                         ret = -EINVAL;
 345                         goto bad_key;
 346                 }
 347                 if (backup_data) {
 348                         if (sscanf_key(backup_data, key + 4)) {
 349                                 ret = -EINVAL;
 350                                 goto bad_key;
 351                         }
 352                 }
 353                 tcp_fastopen_reset_cipher(net, NULL, key,
 354                                           backup_data ? key + 4 : NULL);
 355         }
 356
 357 bad_key:
 358         kfree(tbl.data);
 359         return ret;
 360 }
 361
 362 static void proc_configure_early_demux(int enabled, int protocol)
 363 {
 364         struct net_protocol *ipprot;
 365 #if IS_ENABLED(CONFIG_IPV6)
 366         struct inet6_protocol *ip6prot;
 367 #endif
 368
 369         rcu_read_lock();
 370
 371         ipprot = rcu_dereference(inet_protos[protocol]);
 372         if (ipprot)
 373                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 374                                                 NULL;
 375
 376 #if IS_ENABLED(CONFIG_IPV6)
 377         ip6prot = rcu_dereference(inet6_protos[protocol]);
 378         if (ip6prot)
 379                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 380                                                  NULL;
 381 #endif
 382         rcu_read_unlock();
 383 }
 384
 385 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 386                                 void *buffer, size_t *lenp, loff_t *ppos)
 387 {
 388         int ret = 0;
 389
 390         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 391
 392         if (write && !ret) {
 393                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 394
 395                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 396         }
 397
 398         return ret;
 399 }
 400
 401 static int proc_udp_early_demux(struct ctl_table *table, int write,
 402                                 void *buffer, size_t *lenp, loff_t *ppos)
 403 {
 404         int ret = 0;
 405
 406         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 407
 408         if (write && !ret) {
 409                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 410
 411                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 412         }
 413
 414         return ret;
 415 }
 416
 417 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 418                                              int write, void *buffer,
 419                                              size_t *lenp, loff_t *ppos)
 420 {
 421         struct net *net = container_of(table->data, struct net,
 422             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 423         int ret;
 424
 425         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 426         if (write && ret == 0)
 427                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 428
 429         return ret;
 430 }
 431
 432 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 433                                   int write, void *buffer, size_t *lenp,
 434                                   loff_t *ppos)
 435 {
 436         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 437         int ret;
 438
 439         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 440         if (!tbl.data)
 441                 return -ENOMEM;
 442         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 443         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 444         kfree(tbl.data);
 445
 446         return ret;
 447 }
 448
 449 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 450 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 451                                           void *buffer, size_t *lenp,
 452                                           loff_t *ppos)
 453 {
 454         struct net *net = container_of(table->data, struct net,
 455             ipv4.sysctl_fib_multipath_hash_policy);
 456         int ret;
 457
 458         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 459         if (write && ret == 0)
 460                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 461
 462         return ret;
 463 }
 464 #endif
 465
 466 static struct ctl_table ipv4_table[] = {
 467         {
 468                 .procname       = "tcp_max_orphans",
 469                 .data           = &sysctl_tcp_max_orphans,
 470                 .maxlen         = sizeof(int),
 471                 .mode           = 0644,
 472                 .proc_handler   = proc_dointvec
 473         },
 474         {
 475                 .procname       = "inet_peer_threshold",
 476                 .data           = &inet_peer_threshold,
 477                 .maxlen         = sizeof(int),
 478                 .mode           = 0644,
 479                 .proc_handler   = proc_dointvec
 480         },
 481         {
 482                 .procname       = "inet_peer_minttl",
 483                 .data           = &inet_peer_minttl,
 484                 .maxlen         = sizeof(int),
 485                 .mode           = 0644,
 486                 .proc_handler   = proc_dointvec_jiffies,
 487         },
 488         {
 489                 .procname       = "inet_peer_maxttl",
 490                 .data           = &inet_peer_maxttl,
 491                 .maxlen         = sizeof(int),
 492                 .mode           = 0644,
 493                 .proc_handler   = proc_dointvec_jiffies,
 494         },
 495         {
 496                 .procname       = "tcp_mem",
 497                 .maxlen         = sizeof(sysctl_tcp_mem),
 498                 .data           = &sysctl_tcp_mem,
 499                 .mode           = 0644,
 500                 .proc_handler   = proc_doulongvec_minmax,
 501         },
 502         {
 503                 .procname       = "tcp_low_latency",
 504                 .data           = &sysctl_tcp_low_latency,
 505                 .maxlen         = sizeof(int),
 506                 .mode           = 0644,
 507                 .proc_handler   = proc_dointvec
 508         },
 509 #ifdef CONFIG_NETLABEL
 510         {
 511                 .procname       = "cipso_cache_enable",
 512                 .data           = &cipso_v4_cache_enabled,
 513                 .maxlen         = sizeof(int),
 514                 .mode           = 0644,
 515                 .proc_handler   = proc_dointvec,
 516         },
 517         {
 518                 .procname       = "cipso_cache_bucket_size",
 519                 .data           = &cipso_v4_cache_bucketsize,
 520                 .maxlen         = sizeof(int),
 521                 .mode           = 0644,
 522                 .proc_handler   = proc_dointvec,
 523         },
 524         {
 525                 .procname       = "cipso_rbm_optfmt",
 526                 .data           = &cipso_v4_rbm_optfmt,
 527                 .maxlen         = sizeof(int),
 528                 .mode           = 0644,
 529                 .proc_handler   = proc_dointvec,
 530         },
 531         {
 532                 .procname       = "cipso_rbm_strictvalid",
 533                 .data           = &cipso_v4_rbm_strictvalid,
 534                 .maxlen         = sizeof(int),
 535                 .mode           = 0644,
 536                 .proc_handler   = proc_dointvec,
 537         },
 538 #endif /* CONFIG_NETLABEL */
 539         {
 540                 .procname       = "tcp_available_ulp",
 541                 .maxlen         = TCP_ULP_BUF_MAX,
 542                 .mode           = 0444,
 543                 .proc_handler   = proc_tcp_available_ulp,
 544         },
 545         {
 546                 .procname       = "icmp_msgs_per_sec",
 547                 .data           = &sysctl_icmp_msgs_per_sec,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_dointvec_minmax,
 551                 .extra1         = SYSCTL_ZERO,
 552         },
 553         {
 554                 .procname       = "icmp_msgs_burst",
 555                 .data           = &sysctl_icmp_msgs_burst,
 556                 .maxlen         = sizeof(int),
 557                 .mode           = 0644,
 558                 .proc_handler   = proc_dointvec_minmax,
 559                 .extra1         = SYSCTL_ZERO,
 560         },
 561         {
 562                 .procname       = "udp_mem",
 563                 .data           = &sysctl_udp_mem,
 564                 .maxlen         = sizeof(sysctl_udp_mem),
 565                 .mode           = 0644,
 566                 .proc_handler   = proc_doulongvec_minmax,
 567         },
 568         {
 569                 .procname       = "fib_sync_mem",
 570                 .data           = &sysctl_fib_sync_mem,
 571                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 572                 .mode           = 0644,
 573                 .proc_handler   = proc_douintvec_minmax,
 574                 .extra1         = &sysctl_fib_sync_mem_min,
 575                 .extra2         = &sysctl_fib_sync_mem_max,
 576         },
 577         {
 578                 .procname       = "tcp_rx_skb_cache",
 579                 .data           = &tcp_rx_skb_cache_key.key,
 580                 .mode           = 0644,
 581                 .proc_handler   = proc_do_static_key,
 582         },
 583         {
 584                 .procname       = "tcp_tx_skb_cache",
 585                 .data           = &tcp_tx_skb_cache_key.key,
 586                 .mode           = 0644,
 587                 .proc_handler   = proc_do_static_key,
 588         },
 589         { }
 590 };
 591
 592 static struct ctl_table ipv4_net_table[] = {
 593         {
 594                 .procname       = "icmp_echo_ignore_all",
 595                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 596                 .maxlen         = sizeof(u8),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dou8vec_minmax,
 599         },
 600         {
 601                 .procname       = "icmp_echo_enable_probe",
 602                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 603                 .maxlen         = sizeof(u8),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dou8vec_minmax,
 606                 .extra1         = SYSCTL_ZERO,
 607                 .extra2         = SYSCTL_ONE
 608         },
 609         {
 610                 .procname       = "icmp_echo_ignore_broadcasts",
 611                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 612                 .maxlen         = sizeof(u8),
 613                 .mode           = 0644,
 614                 .proc_handler   = proc_dou8vec_minmax,
 615         },
 616         {
 617                 .procname       = "icmp_ignore_bogus_error_responses",
 618                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 619                 .maxlen         = sizeof(u8),
 620                 .mode           = 0644,
 621                 .proc_handler   = proc_dou8vec_minmax,
 622         },
 623         {
 624                 .procname       = "icmp_errors_use_inbound_ifaddr",
 625                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 626                 .maxlen         = sizeof(u8),
 627                 .mode           = 0644,
 628                 .proc_handler   = proc_dou8vec_minmax,
 629         },
 630         {
 631                 .procname       = "icmp_ratelimit",
 632                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = proc_dointvec_ms_jiffies,
 636         },
 637         {
 638                 .procname       = "icmp_ratemask",
 639                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = proc_dointvec
 643         },
 644         {
 645                 .procname       = "ping_group_range",
 646                 .data           = &init_net.ipv4.ping_group_range.range,
 647                 .maxlen         = sizeof(gid_t)*2,
 648                 .mode           = 0644,
 649                 .proc_handler   = ipv4_ping_group_range,
 650         },
 651 #ifdef CONFIG_NET_L3_MASTER_DEV
 652         {
 653                 .procname       = "raw_l3mdev_accept",
 654                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 655                 .maxlen         = sizeof(u8),
 656                 .mode           = 0644,
 657                 .proc_handler   = proc_dou8vec_minmax,
 658                 .extra1         = SYSCTL_ZERO,
 659                 .extra2         = SYSCTL_ONE,
 660         },
 661 #endif
 662         {
 663                 .procname       = "tcp_ecn",
 664                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 665                 .maxlen         = sizeof(u8),
 666                 .mode           = 0644,
 667                 .proc_handler   = proc_dou8vec_minmax,
 668         },
 669         {
 670                 .procname       = "tcp_ecn_fallback",
 671                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 672                 .maxlen         = sizeof(u8),
 673                 .mode           = 0644,
 674                 .proc_handler   = proc_dou8vec_minmax,
 675         },
 676         {
 677                 .procname       = "ip_dynaddr",
 678                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 679                 .maxlen         = sizeof(u8),
 680                 .mode           = 0644,
 681                 .proc_handler   = proc_dou8vec_minmax,
 682         },
 683         {
 684                 .procname       = "ip_early_demux",
 685                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 686                 .maxlen         = sizeof(u8),
 687                 .mode           = 0644,
 688                 .proc_handler   = proc_dou8vec_minmax,
 689         },
 690         {
 691                 .procname       = "udp_early_demux",
 692                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 693                 .maxlen         = sizeof(u8),
 694                 .mode           = 0644,
 695                 .proc_handler   = proc_udp_early_demux
 696         },
 697         {
 698                 .procname       = "tcp_early_demux",
 699                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 700                 .maxlen         = sizeof(u8),
 701                 .mode           = 0644,
 702                 .proc_handler   = proc_tcp_early_demux
 703         },
 704         {
 705                 .procname       = "nexthop_compat_mode",
 706                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 707                 .maxlen         = sizeof(u8),
 708                 .mode           = 0644,
 709                 .proc_handler   = proc_dou8vec_minmax,
 710                 .extra1         = SYSCTL_ZERO,
 711                 .extra2         = SYSCTL_ONE,
 712         },
 713         {
 714                 .procname       = "ip_default_ttl",
 715                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 716                 .maxlen         = sizeof(u8),
 717                 .mode           = 0644,
 718                 .proc_handler   = proc_dou8vec_minmax,
 719                 .extra1         = &ip_ttl_min,
 720                 .extra2         = &ip_ttl_max,
 721         },
 722         {
 723                 .procname       = "ip_local_port_range",
 724                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 725                 .data           = &init_net.ipv4.ip_local_ports.range,
 726                 .mode           = 0644,
 727                 .proc_handler   = ipv4_local_port_range,
 728         },
 729         {
 730                 .procname       = "ip_local_reserved_ports",
 731                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 732                 .maxlen         = 65536,
 733                 .mode           = 0644,
 734                 .proc_handler   = proc_do_large_bitmap,
 735         },
 736         {
 737                 .procname       = "ip_no_pmtu_disc",
 738                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 739                 .maxlen         = sizeof(u8),
 740                 .mode           = 0644,
 741                 .proc_handler   = proc_dou8vec_minmax,
 742         },
 743         {
 744                 .procname       = "ip_forward_use_pmtu",
 745                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 746                 .maxlen         = sizeof(u8),
 747                 .mode           = 0644,
 748                 .proc_handler   = proc_dou8vec_minmax,
 749         },
 750         {
 751                 .procname       = "ip_forward_update_priority",
 752                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 753                 .maxlen         = sizeof(u8),
 754                 .mode           = 0644,
 755                 .proc_handler   = ipv4_fwd_update_priority,
 756                 .extra1         = SYSCTL_ZERO,
 757                 .extra2         = SYSCTL_ONE,
 758         },
 759         {
 760                 .procname       = "ip_nonlocal_bind",
 761                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 762                 .maxlen         = sizeof(u8),
 763                 .mode           = 0644,
 764                 .proc_handler   = proc_dou8vec_minmax,
 765         },
 766         {
 767                 .procname       = "ip_autobind_reuse",
 768                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 769                 .maxlen         = sizeof(u8),
 770                 .mode           = 0644,
 771                 .proc_handler   = proc_dou8vec_minmax,
 772                 .extra1         = SYSCTL_ZERO,
 773                 .extra2         = SYSCTL_ONE,
 774         },
 775         {
 776                 .procname       = "fwmark_reflect",
 777                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 778                 .maxlen         = sizeof(u8),
 779                 .mode           = 0644,
 780                 .proc_handler   = proc_dou8vec_minmax,
 781         },
 782         {
 783                 .procname       = "tcp_fwmark_accept",
 784                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 785                 .maxlen         = sizeof(u8),
 786                 .mode           = 0644,
 787                 .proc_handler   = proc_dou8vec_minmax,
 788         },
 789 #ifdef CONFIG_NET_L3_MASTER_DEV
 790         {
 791                 .procname       = "tcp_l3mdev_accept",
 792                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 793                 .maxlen         = sizeof(u8),
 794                 .mode           = 0644,
 795                 .proc_handler   = proc_dou8vec_minmax,
 796                 .extra1         = SYSCTL_ZERO,
 797                 .extra2         = SYSCTL_ONE,
 798         },
 799 #endif
 800         {
 801                 .procname       = "tcp_mtu_probing",
 802                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 803                 .maxlen         = sizeof(u8),
 804                 .mode           = 0644,
 805                 .proc_handler   = proc_dou8vec_minmax,
 806         },
 807         {
 808                 .procname       = "tcp_base_mss",
 809                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 810                 .maxlen         = sizeof(int),
 811                 .mode           = 0644,
 812                 .proc_handler   = proc_dointvec,
 813         },
 814         {
 815                 .procname       = "tcp_min_snd_mss",
 816                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 817                 .maxlen         = sizeof(int),
 818                 .mode           = 0644,
 819                 .proc_handler   = proc_dointvec_minmax,
 820                 .extra1         = &tcp_min_snd_mss_min,
 821                 .extra2         = &tcp_min_snd_mss_max,
 822         },
 823         {
 824                 .procname       = "tcp_mtu_probe_floor",
 825                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 826                 .maxlen         = sizeof(int),
 827                 .mode           = 0644,
 828                 .proc_handler   = proc_dointvec_minmax,
 829                 .extra1         = &tcp_min_snd_mss_min,
 830                 .extra2         = &tcp_min_snd_mss_max,
 831         },
 832         {
 833                 .procname       = "tcp_probe_threshold",
 834                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 835                 .maxlen         = sizeof(int),
 836                 .mode           = 0644,
 837                 .proc_handler   = proc_dointvec,
 838         },
 839         {
 840                 .procname       = "tcp_probe_interval",
 841                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 842                 .maxlen         = sizeof(u32),
 843                 .mode           = 0644,
 844                 .proc_handler   = proc_douintvec_minmax,
 845                 .extra2         = &u32_max_div_HZ,
 846         },
 847         {
 848                 .procname       = "igmp_link_local_mcast_reports",
 849                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 850                 .maxlen         = sizeof(u8),
 851                 .mode           = 0644,
 852                 .proc_handler   = proc_dou8vec_minmax,
 853         },
 854         {
 855                 .procname       = "igmp_max_memberships",
 856                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 857                 .maxlen         = sizeof(int),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_dointvec
 860         },
 861         {
 862                 .procname       = "igmp_max_msf",
 863                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 864                 .maxlen         = sizeof(int),
 865                 .mode           = 0644,
 866                 .proc_handler   = proc_dointvec
 867         },
 868 #ifdef CONFIG_IP_MULTICAST
 869         {
 870                 .procname       = "igmp_qrv",
 871                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 872                 .maxlen         = sizeof(int),
 873                 .mode           = 0644,
 874                 .proc_handler   = proc_dointvec_minmax,
 875                 .extra1         = SYSCTL_ONE
 876         },
 877 #endif
 878         {
 879                 .procname       = "tcp_congestion_control",
 880                 .data           = &init_net.ipv4.tcp_congestion_control,
 881                 .mode           = 0644,
 882                 .maxlen         = TCP_CA_NAME_MAX,
 883                 .proc_handler   = proc_tcp_congestion_control,
 884         },
 885         {
 886                 .procname       = "tcp_available_congestion_control",
 887                 .maxlen         = TCP_CA_BUF_MAX,
 888                 .mode           = 0444,
 889                 .proc_handler   = proc_tcp_available_congestion_control,
 890         },
 891         {
 892                 .procname       = "tcp_allowed_congestion_control",
 893                 .maxlen         = TCP_CA_BUF_MAX,
 894                 .mode           = 0644,
 895                 .proc_handler   = proc_allowed_congestion_control,
 896         },
 897         {
 898                 .procname       = "tcp_keepalive_time",
 899                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 900                 .maxlen         = sizeof(int),
 901                 .mode           = 0644,
 902                 .proc_handler   = proc_dointvec_jiffies,
 903         },
 904         {
 905                 .procname       = "tcp_keepalive_probes",
 906                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 907                 .maxlen         = sizeof(u8),
 908                 .mode           = 0644,
 909                 .proc_handler   = proc_dou8vec_minmax,
 910         },
 911         {
 912                 .procname       = "tcp_keepalive_intvl",
 913                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 914                 .maxlen         = sizeof(int),
 915                 .mode           = 0644,
 916                 .proc_handler   = proc_dointvec_jiffies,
 917         },
 918         {
 919                 .procname       = "tcp_syn_retries",
 920                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 921                 .maxlen         = sizeof(u8),
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_dou8vec_minmax,
 924                 .extra1         = &tcp_syn_retries_min,
 925                 .extra2         = &tcp_syn_retries_max
 926         },
 927         {
 928                 .procname       = "tcp_synack_retries",
 929                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 930                 .maxlen         = sizeof(u8),
 931                 .mode           = 0644,
 932                 .proc_handler   = proc_dou8vec_minmax,
 933         },
 934 #ifdef CONFIG_SYN_COOKIES
 935         {
 936                 .procname       = "tcp_syncookies",
 937                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 938                 .maxlen         = sizeof(u8),
 939                 .mode           = 0644,
 940                 .proc_handler   = proc_dou8vec_minmax,
 941         },
 942 #endif
 943         {
 944                 .procname       = "tcp_reordering",
 945                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 946                 .maxlen         = sizeof(int),
 947                 .mode           = 0644,
 948                 .proc_handler   = proc_dointvec
 949         },
 950         {
 951                 .procname       = "tcp_retries1",
 952                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 953                 .maxlen         = sizeof(u8),
 954                 .mode           = 0644,
 955                 .proc_handler   = proc_dou8vec_minmax,
 956                 .extra2         = &tcp_retr1_max
 957         },
 958         {
 959                 .procname       = "tcp_retries2",
 960                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 961                 .maxlen         = sizeof(u8),
 962                 .mode           = 0644,
 963                 .proc_handler   = proc_dou8vec_minmax,
 964         },
 965         {
 966                 .procname       = "tcp_orphan_retries",
 967                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 968                 .maxlen         = sizeof(u8),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_dou8vec_minmax,
 971         },
 972         {
 973                 .procname       = "tcp_fin_timeout",
 974                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 975                 .maxlen         = sizeof(int),
 976                 .mode           = 0644,
 977                 .proc_handler   = proc_dointvec_jiffies,
 978         },
 979         {
 980                 .procname       = "tcp_notsent_lowat",
 981                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 982                 .maxlen         = sizeof(unsigned int),
 983                 .mode           = 0644,
 984                 .proc_handler   = proc_douintvec,
 985         },
 986         {
 987                 .procname       = "tcp_tw_reuse",
 988                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 989                 .maxlen         = sizeof(u8),
 990                 .mode           = 0644,
 991                 .proc_handler   = proc_dou8vec_minmax,
 992                 .extra1         = SYSCTL_ZERO,
 993                 .extra2         = &two,
 994         },
 995         {
 996                 .procname       = "tcp_max_tw_buckets",
 997                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 998                 .maxlen         = sizeof(int),
 999                 .mode           = 0644,
1000                 .proc_handler   = proc_dointvec
1001         },
1002         {
1003                 .procname       = "tcp_max_syn_backlog",
1004                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1005                 .maxlen         = sizeof(int),
1006                 .mode           = 0644,
1007                 .proc_handler   = proc_dointvec
1008         },
1009         {
1010                 .procname       = "tcp_fastopen",
1011                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1012                 .maxlen         = sizeof(int),
1013                 .mode           = 0644,
1014                 .proc_handler   = proc_dointvec,
1015         },
1016         {
1017                 .procname       = "tcp_fastopen_key",
1018                 .mode           = 0600,
1019                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1020                 /* maxlen to print the list of keys in hex (*2), with dashes
1021                  * separating doublewords and a comma in between keys.
1022                  */
1023                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1024                                    2 * TCP_FASTOPEN_KEY_MAX) +
1025                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1026                 .proc_handler   = proc_tcp_fastopen_key,
1027         },
1028         {
1029                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1030                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1031                 .maxlen         = sizeof(int),
1032                 .mode           = 0644,
1033                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1034                 .extra1         = SYSCTL_ZERO,
1035         },
1036 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1037         {
1038                 .procname       = "fib_multipath_use_neigh",
1039                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1040                 .maxlen         = sizeof(u8),
1041                 .mode           = 0644,
1042                 .proc_handler   = proc_dou8vec_minmax,
1043                 .extra1         = SYSCTL_ZERO,
1044                 .extra2         = SYSCTL_ONE,
1045         },
1046         {
1047                 .procname       = "fib_multipath_hash_policy",
1048                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1049                 .maxlen         = sizeof(u8),
1050                 .mode           = 0644,
1051                 .proc_handler   = proc_fib_multipath_hash_policy,
1052                 .extra1         = SYSCTL_ZERO,
1053                 .extra2         = &two,
1054         },
1055 #endif
1056         {
1057                 .procname       = "ip_unprivileged_port_start",
1058                 .maxlen         = sizeof(int),
1059                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1060                 .mode           = 0644,
1061                 .proc_handler   = ipv4_privileged_ports,
1062         },
1063 #ifdef CONFIG_NET_L3_MASTER_DEV
1064         {
1065                 .procname       = "udp_l3mdev_accept",
1066                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1067                 .maxlen         = sizeof(u8),
1068                 .mode           = 0644,
1069                 .proc_handler   = proc_dou8vec_minmax,
1070                 .extra1         = SYSCTL_ZERO,
1071                 .extra2         = SYSCTL_ONE,
1072         },
1073 #endif
1074         {
1075                 .procname       = "tcp_sack",
1076                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1077                 .maxlen         = sizeof(u8),
1078                 .mode           = 0644,
1079                 .proc_handler   = proc_dou8vec_minmax,
1080         },
1081         {
1082                 .procname       = "tcp_window_scaling",
1083                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1084                 .maxlen         = sizeof(u8),
1085                 .mode           = 0644,
1086                 .proc_handler   = proc_dou8vec_minmax,
1087         },
1088         {
1089                 .procname       = "tcp_timestamps",
1090                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1091                 .maxlen         = sizeof(u8),
1092                 .mode           = 0644,
1093                 .proc_handler   = proc_dou8vec_minmax,
1094         },
1095         {
1096                 .procname       = "tcp_early_retrans",
1097                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1098                 .maxlen         = sizeof(u8),
1099                 .mode           = 0644,
1100                 .proc_handler   = proc_dou8vec_minmax,
1101                 .extra1         = SYSCTL_ZERO,
1102                 .extra2         = &four,
1103         },
1104         {
1105                 .procname       = "tcp_recovery",
1106                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1107                 .maxlen         = sizeof(u8),
1108                 .mode           = 0644,
1109                 .proc_handler   = proc_dou8vec_minmax,
1110         },
1111         {
1112                 .procname       = "tcp_thin_linear_timeouts",
1113                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1114                 .maxlen         = sizeof(u8),
1115                 .mode           = 0644,
1116                 .proc_handler   = proc_dou8vec_minmax,
1117         },
1118         {
1119                 .procname       = "tcp_slow_start_after_idle",
1120                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1121                 .maxlen         = sizeof(u8),
1122                 .mode           = 0644,
1123                 .proc_handler   = proc_dou8vec_minmax,
1124         },
1125         {
1126                 .procname       = "tcp_retrans_collapse",
1127                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1128                 .maxlen         = sizeof(u8),
1129                 .mode           = 0644,
1130                 .proc_handler   = proc_dou8vec_minmax,
1131         },
1132         {
1133                 .procname       = "tcp_stdurg",
1134                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1135                 .maxlen         = sizeof(u8),
1136                 .mode           = 0644,
1137                 .proc_handler   = proc_dou8vec_minmax,
1138         },
1139         {
1140                 .procname       = "tcp_rfc1337",
1141                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1142                 .maxlen         = sizeof(u8),
1143                 .mode           = 0644,
1144                 .proc_handler   = proc_dou8vec_minmax,
1145         },
1146         {
1147                 .procname       = "tcp_abort_on_overflow",
1148                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1149                 .maxlen         = sizeof(u8),
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dou8vec_minmax,
1152         },
1153         {
1154                 .procname       = "tcp_fack",
1155                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1156                 .maxlen         = sizeof(u8),
1157                 .mode           = 0644,
1158                 .proc_handler   = proc_dou8vec_minmax,
1159         },
1160         {
1161                 .procname       = "tcp_max_reordering",
1162                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1163                 .maxlen         = sizeof(int),
1164                 .mode           = 0644,
1165                 .proc_handler   = proc_dointvec
1166         },
1167         {
1168                 .procname       = "tcp_dsack",
1169                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1170                 .maxlen         = sizeof(u8),
1171                 .mode           = 0644,
1172                 .proc_handler   = proc_dou8vec_minmax,
1173         },
1174         {
1175                 .procname       = "tcp_app_win",
1176                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1177                 .maxlen         = sizeof(u8),
1178                 .mode           = 0644,
1179                 .proc_handler   = proc_dou8vec_minmax,
1180         },
1181         {
1182                 .procname       = "tcp_adv_win_scale",
1183                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1184                 .maxlen         = sizeof(int),
1185                 .mode           = 0644,
1186                 .proc_handler   = proc_dointvec_minmax,
1187                 .extra1         = &tcp_adv_win_scale_min,
1188                 .extra2         = &tcp_adv_win_scale_max,
1189         },
1190         {
1191                 .procname       = "tcp_frto",
1192                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1193                 .maxlen         = sizeof(u8),
1194                 .mode           = 0644,
1195                 .proc_handler   = proc_dou8vec_minmax,
1196         },
1197         {
1198                 .procname       = "tcp_no_metrics_save",
1199                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1200                 .maxlen         = sizeof(u8),
1201                 .mode           = 0644,
1202                 .proc_handler   = proc_dou8vec_minmax,
1203         },
1204         {
1205                 .procname       = "tcp_no_ssthresh_metrics_save",
1206                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1207                 .maxlen         = sizeof(u8),
1208                 .mode           = 0644,
1209                 .proc_handler   = proc_dou8vec_minmax,
1210                 .extra1         = SYSCTL_ZERO,
1211                 .extra2         = SYSCTL_ONE,
1212         },
1213         {
1214                 .procname       = "tcp_moderate_rcvbuf",
1215                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1216                 .maxlen         = sizeof(u8),
1217                 .mode           = 0644,
1218                 .proc_handler   = proc_dou8vec_minmax,
1219         },
1220         {
1221                 .procname       = "tcp_tso_win_divisor",
1222                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1223                 .maxlen         = sizeof(u8),
1224                 .mode           = 0644,
1225                 .proc_handler   = proc_dou8vec_minmax,
1226         },
1227         {
1228                 .procname       = "tcp_workaround_signed_windows",
1229                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1230                 .maxlen         = sizeof(u8),
1231                 .mode           = 0644,
1232                 .proc_handler   = proc_dou8vec_minmax,
1233         },
1234         {
1235                 .procname       = "tcp_limit_output_bytes",
1236                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1237                 .maxlen         = sizeof(int),
1238                 .mode           = 0644,
1239                 .proc_handler   = proc_dointvec
1240         },
1241         {
1242                 .procname       = "tcp_challenge_ack_limit",
1243                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1244                 .maxlen         = sizeof(int),
1245                 .mode           = 0644,
1246                 .proc_handler   = proc_dointvec
1247         },
1248         {
1249                 .procname       = "tcp_min_tso_segs",
1250                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1251                 .maxlen         = sizeof(u8),
1252                 .mode           = 0644,
1253                 .proc_handler   = proc_dou8vec_minmax,
1254                 .extra1         = SYSCTL_ONE,
1255         },
1256         {
1257                 .procname       = "tcp_min_rtt_wlen",
1258                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1259                 .maxlen         = sizeof(int),
1260                 .mode           = 0644,
1261                 .proc_handler   = proc_dointvec_minmax,
1262                 .extra1         = SYSCTL_ZERO,
1263                 .extra2         = &one_day_secs
1264         },
1265         {
1266                 .procname       = "tcp_autocorking",
1267                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1268                 .maxlen         = sizeof(u8),
1269                 .mode           = 0644,
1270                 .proc_handler   = proc_dou8vec_minmax,
1271                 .extra1         = SYSCTL_ZERO,
1272                 .extra2         = SYSCTL_ONE,
1273         },
1274         {
1275                 .procname       = "tcp_invalid_ratelimit",
1276                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1277                 .maxlen         = sizeof(int),
1278                 .mode           = 0644,
1279                 .proc_handler   = proc_dointvec_ms_jiffies,
1280         },
1281         {
1282                 .procname       = "tcp_pacing_ss_ratio",
1283                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1284                 .maxlen         = sizeof(int),
1285                 .mode           = 0644,
1286                 .proc_handler   = proc_dointvec_minmax,
1287                 .extra1         = SYSCTL_ZERO,
1288                 .extra2         = &thousand,
1289         },
1290         {
1291                 .procname       = "tcp_pacing_ca_ratio",
1292                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1293                 .maxlen         = sizeof(int),
1294                 .mode           = 0644,
1295                 .proc_handler   = proc_dointvec_minmax,
1296                 .extra1         = SYSCTL_ZERO,
1297                 .extra2         = &thousand,
1298         },
1299         {
1300                 .procname       = "tcp_wmem",
1301                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1302                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1303                 .mode           = 0644,
1304                 .proc_handler   = proc_dointvec_minmax,
1305                 .extra1         = SYSCTL_ONE,
1306         },
1307         {
1308                 .procname       = "tcp_rmem",
1309                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1310                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1311                 .mode           = 0644,
1312                 .proc_handler   = proc_dointvec_minmax,
1313                 .extra1         = SYSCTL_ONE,
1314         },
1315         {
1316                 .procname       = "tcp_comp_sack_delay_ns",
1317                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1318                 .maxlen         = sizeof(unsigned long),
1319                 .mode           = 0644,
1320                 .proc_handler   = proc_doulongvec_minmax,
1321         },
1322         {
1323                 .procname       = "tcp_comp_sack_slack_ns",
1324                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1325                 .maxlen         = sizeof(unsigned long),
1326                 .mode           = 0644,
1327                 .proc_handler   = proc_doulongvec_minmax,
1328         },
1329         {
1330                 .procname       = "tcp_comp_sack_nr",
1331                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1332                 .maxlen         = sizeof(u8),
1333                 .mode           = 0644,
1334                 .proc_handler   = proc_dou8vec_minmax,
1335                 .extra1         = SYSCTL_ZERO,
1336         },
1337         {
1338                 .procname       = "tcp_reflect_tos",
1339                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1340                 .maxlen         = sizeof(u8),
1341                 .mode           = 0644,
1342                 .proc_handler   = proc_dou8vec_minmax,
1343                 .extra1         = SYSCTL_ZERO,
1344                 .extra2         = SYSCTL_ONE,
1345         },
1346         {
1347                 .procname       = "udp_rmem_min",
1348                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1349                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1350                 .mode           = 0644,
1351                 .proc_handler   = proc_dointvec_minmax,
1352                 .extra1         = SYSCTL_ONE
1353         },
1354         {
1355                 .procname       = "udp_wmem_min",
1356                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1357                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1358                 .mode           = 0644,
1359                 .proc_handler   = proc_dointvec_minmax,
1360                 .extra1         = SYSCTL_ONE
1361         },
1362         {
1363                 .procname       = "fib_notify_on_flag_change",
1364                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1365                 .maxlen         = sizeof(u8),
1366                 .mode           = 0644,
1367                 .proc_handler   = proc_dou8vec_minmax,
1368                 .extra1         = SYSCTL_ZERO,
1369                 .extra2         = &two,
1370         },
1371         { }
1372 };
1373
1374 static __net_init int ipv4_sysctl_init_net(struct net *net)
1375 {
1376         struct ctl_table *table;
1377
1378         table = ipv4_net_table;
1379         if (!net_eq(net, &init_net)) {
1380                 int i;
1381
1382                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1383                 if (!table)
1384                         goto err_alloc;
1385
1386                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1387                         if (table[i].data) {
1388                                 /* Update the variables to point into
1389                                  * the current struct net
1390                                  */
1391                                 table[i].data += (void *)net - (void *)&init_net;
1392                         } else {
1393                                 /* Entries without data pointer are global;
1394                                  * Make them read-only in non-init_net ns
1395                                  */
1396                                 table[i].mode &= ~0222;
1397                         }
1398                 }
1399         }
1400
1401         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1402         if (!net->ipv4.ipv4_hdr)
1403                 goto err_reg;
1404
1405         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1406         if (!net->ipv4.sysctl_local_reserved_ports)
1407                 goto err_ports;
1408
1409         return 0;
1410
1411 err_ports:
1412         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1413 err_reg:
1414         if (!net_eq(net, &init_net))
1415                 kfree(table);
1416 err_alloc:
1417         return -ENOMEM;
1418 }
1419
1420 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1421 {
1422         struct ctl_table *table;
1423
1424         kfree(net->ipv4.sysctl_local_reserved_ports);
1425         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1426         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1427         kfree(table);
1428 }
1429
1430 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1431         .init = ipv4_sysctl_init_net,
1432         .exit = ipv4_sysctl_exit_net,
1433 };
1434
1435 static __init int sysctl_ipv4_init(void)
1436 {
1437         struct ctl_table_header *hdr;
1438
1439         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1440         if (!hdr)
1441                 return -ENOMEM;
1442
1443         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1444                 unregister_net_sysctl_table(hdr);
1445                 return -ENOMEM;
1446         }
1447
1448         return 0;
1449 }
1450
1451 __initcall(sysctl_ipv4_init);