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