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/sysctl.h>
  10 #include <linux/seqlock.h>
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <net/icmp.h>
  14 #include <net/ip.h>
  15 #include <net/ip_fib.h>
  16 #include <net/tcp.h>
  17 #include <net/udp.h>
  18 #include <net/cipso_ipv4.h>
  19 #include <net/ping.h>
  20 #include <net/protocol.h>
  21 #include <net/netevent.h>
  22
  23 static int two = 2;
  24 static int three __maybe_unused = 3;
  25 static int four = 4;
  26 static int thousand = 1000;
  27 static int tcp_retr1_max = 255;
  28 static int ip_local_port_range_min[] = { 1, 1 };
  29 static int ip_local_port_range_max[] = { 65535, 65535 };
  30 static int tcp_adv_win_scale_min = -31;
  31 static int tcp_adv_win_scale_max = 31;
  32 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  33 static int tcp_min_snd_mss_max = 65535;
  34 static int ip_privileged_port_min;
  35 static int ip_privileged_port_max = 65535;
  36 static int ip_ttl_min = 1;
  37 static int ip_ttl_max = 255;
  38 static int tcp_syn_retries_min = 1;
  39 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  40 static int ip_ping_group_range_min[] = { 0, 0 };
  41 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  42 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  43 static int one_day_secs = 24 * 3600;
  44 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
  45         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
  46
  47 /* obsolete */
  48 static int sysctl_tcp_low_latency __read_mostly;
  49
  50 /* Update system visible IP port range */
  51 static void set_local_port_range(struct net *net, int range[2])
  52 {
  53         bool same_parity = !((range[0] ^ range[1]) & 1);
  54
  55         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  56         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  57                 net->ipv4.ip_local_ports.warned = true;
  58                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  59         }
  60         net->ipv4.ip_local_ports.range[0] = range[0];
  61         net->ipv4.ip_local_ports.range[1] = range[1];
  62         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  63 }
  64
  65 /* Validate changes from /proc interface. */
  66 static int ipv4_local_port_range(struct ctl_table *table, int write,
  67                                  void *buffer, size_t *lenp, loff_t *ppos)
  68 {
  69         struct net *net =
  70                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  71         int ret;
  72         int range[2];
  73         struct ctl_table tmp = {
  74                 .data = &range,
  75                 .maxlen = sizeof(range),
  76                 .mode = table->mode,
  77                 .extra1 = &ip_local_port_range_min,
  78                 .extra2 = &ip_local_port_range_max,
  79         };
  80
  81         inet_get_local_port_range(net, &range[0], &range[1]);
  82
  83         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  84
  85         if (write && ret == 0) {
  86                 /* Ensure that the upper limit is not smaller than the lower,
  87                  * and that the lower does not encroach upon the privileged
  88                  * port limit.
  89                  */
  90                 if ((range[1] < range[0]) ||
  91                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
  92                         ret = -EINVAL;
  93                 else
  94                         set_local_port_range(net, range);
  95         }
  96
  97         return ret;
  98 }
  99
 100 /* Validate changes from /proc interface. */
 101 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 102                                 void *buffer, size_t *lenp, loff_t *ppos)
 103 {
 104         struct net *net = container_of(table->data, struct net,
 105             ipv4.sysctl_ip_prot_sock);
 106         int ret;
 107         int pports;
 108         int range[2];
 109         struct ctl_table tmp = {
 110                 .data = &pports,
 111                 .maxlen = sizeof(pports),
 112                 .mode = table->mode,
 113                 .extra1 = &ip_privileged_port_min,
 114                 .extra2 = &ip_privileged_port_max,
 115         };
 116
 117         pports = net->ipv4.sysctl_ip_prot_sock;
 118
 119         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 120
 121         if (write && ret == 0) {
 122                 inet_get_local_port_range(net, &range[0], &range[1]);
 123                 /* Ensure that the local port range doesn't overlap with the
 124                  * privileged port range.
 125                  */
 126                 if (range[0] < pports)
 127                         ret = -EINVAL;
 128                 else
 129                         net->ipv4.sysctl_ip_prot_sock = pports;
 130         }
 131
 132         return ret;
 133 }
 134
 135 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 136 {
 137         kgid_t *data = table->data;
 138         struct net *net =
 139                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 140         unsigned int seq;
 141         do {
 142                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 143
 144                 *low = data[0];
 145                 *high = data[1];
 146         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 147 }
 148
 149 /* Update system visible IP port range */
 150 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 151 {
 152         kgid_t *data = table->data;
 153         struct net *net =
 154                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 155         write_seqlock(&net->ipv4.ping_group_range.lock);
 156         data[0] = low;
 157         data[1] = high;
 158         write_sequnlock(&net->ipv4.ping_group_range.lock);
 159 }
 160
 161 /* Validate changes from /proc interface. */
 162 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 163                                  void *buffer, size_t *lenp, loff_t *ppos)
 164 {
 165         struct user_namespace *user_ns = current_user_ns();
 166         int ret;
 167         gid_t urange[2];
 168         kgid_t low, high;
 169         struct ctl_table tmp = {
 170                 .data = &urange,
 171                 .maxlen = sizeof(urange),
 172                 .mode = table->mode,
 173                 .extra1 = &ip_ping_group_range_min,
 174                 .extra2 = &ip_ping_group_range_max,
 175         };
 176
 177         inet_get_ping_group_range_table(table, &low, &high);
 178         urange[0] = from_kgid_munged(user_ns, low);
 179         urange[1] = from_kgid_munged(user_ns, high);
 180         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 181
 182         if (write && ret == 0) {
 183                 low = make_kgid(user_ns, urange[0]);
 184                 high = make_kgid(user_ns, urange[1]);
 185                 if (!gid_valid(low) || !gid_valid(high))
 186                         return -EINVAL;
 187                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 188                         low = make_kgid(&init_user_ns, 1);
 189                         high = make_kgid(&init_user_ns, 0);
 190                 }
 191                 set_ping_group_range(table, low, high);
 192         }
 193
 194         return ret;
 195 }
 196
 197 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 198                                     void *buffer, size_t *lenp, loff_t *ppos)
 199 {
 200         struct net *net;
 201         int ret;
 202
 203         net = container_of(table->data, struct net,
 204                            ipv4.sysctl_ip_fwd_update_priority);
 205         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 206         if (write && ret == 0)
 207                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 208                                         net);
 209
 210         return ret;
 211 }
 212
 213 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 214                                        void *buffer, size_t *lenp, loff_t *ppos)
 215 {
 216         struct net *net = container_of(ctl->data, struct net,
 217                                        ipv4.tcp_congestion_control);
 218         char val[TCP_CA_NAME_MAX];
 219         struct ctl_table tbl = {
 220                 .data = val,
 221                 .maxlen = TCP_CA_NAME_MAX,
 222         };
 223         int ret;
 224
 225         tcp_get_default_congestion_control(net, val);
 226
 227         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 228         if (write && ret == 0)
 229                 ret = tcp_set_default_congestion_control(net, val);
 230         return ret;
 231 }
 232
 233 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 234                                                  int write, void *buffer,
 235                                                  size_t *lenp, loff_t *ppos)
 236 {
 237         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 238         int ret;
 239
 240         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 241         if (!tbl.data)
 242                 return -ENOMEM;
 243         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 244         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 245         kfree(tbl.data);
 246         return ret;
 247 }
 248
 249 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 250                                            int write, void *buffer,
 251                                            size_t *lenp, loff_t *ppos)
 252 {
 253         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 254         int ret;
 255
 256         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 257         if (!tbl.data)
 258                 return -ENOMEM;
 259
 260         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 261         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 262         if (write && ret == 0)
 263                 ret = tcp_set_allowed_congestion_control(tbl.data);
 264         kfree(tbl.data);
 265         return ret;
 266 }
 267
 268 static int sscanf_key(char *buf, __le32 *key)
 269 {
 270         u32 user_key[4];
 271         int i, ret = 0;
 272
 273         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 274                    user_key + 2, user_key + 3) != 4) {
 275                 ret = -EINVAL;
 276         } else {
 277                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 278                         key[i] = cpu_to_le32(user_key[i]);
 279         }
 280         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 281                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 282
 283         return ret;
 284 }
 285
 286 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 287                                  void *buffer, size_t *lenp, loff_t *ppos)
 288 {
 289         struct net *net = container_of(table->data, struct net,
 290             ipv4.sysctl_tcp_fastopen);
 291         /* maxlen to print the list of keys in hex (*2), with dashes
 292          * separating doublewords and a comma in between keys.
 293          */
 294         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 295                                             2 * TCP_FASTOPEN_KEY_MAX) +
 296                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 297         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 298         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 299         char *backup_data;
 300         int ret, i = 0, off = 0, n_keys;
 301
 302         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 303         if (!tbl.data)
 304                 return -ENOMEM;
 305
 306         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 307         if (!n_keys) {
 308                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 309                 n_keys = 1;
 310         }
 311
 312         for (i = 0; i < n_keys * 4; i++)
 313                 user_key[i] = le32_to_cpu(key[i]);
 314
 315         for (i = 0; i < n_keys; i++) {
 316                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 317                                 "%08x-%08x-%08x-%08x",
 318                                 user_key[i * 4],
 319                                 user_key[i * 4 + 1],
 320                                 user_key[i * 4 + 2],
 321                                 user_key[i * 4 + 3]);
 322
 323                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 324                         break;
 325
 326                 if (i + 1 < n_keys)
 327                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 328         }
 329
 330         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 331
 332         if (write && ret == 0) {
 333                 backup_data = strchr(tbl.data, ',');
 334                 if (backup_data) {
 335                         *backup_data = '\0';
 336                         backup_data++;
 337                 }
 338                 if (sscanf_key(tbl.data, key)) {
 339                         ret = -EINVAL;
 340                         goto bad_key;
 341                 }
 342                 if (backup_data) {
 343                         if (sscanf_key(backup_data, key + 4)) {
 344                                 ret = -EINVAL;
 345                                 goto bad_key;
 346                         }
 347                 }
 348                 tcp_fastopen_reset_cipher(net, NULL, key,
 349                                           backup_data ? key + 4 : NULL);
 350         }
 351
 352 bad_key:
 353         kfree(tbl.data);
 354         return ret;
 355 }
 356
 357 static void proc_configure_early_demux(int enabled, int protocol)
 358 {
 359         struct net_protocol *ipprot;
 360 #if IS_ENABLED(CONFIG_IPV6)
 361         struct inet6_protocol *ip6prot;
 362 #endif
 363
 364         rcu_read_lock();
 365
 366         ipprot = rcu_dereference(inet_protos[protocol]);
 367         if (ipprot)
 368                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 369                                                 NULL;
 370
 371 #if IS_ENABLED(CONFIG_IPV6)
 372         ip6prot = rcu_dereference(inet6_protos[protocol]);
 373         if (ip6prot)
 374                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 375                                                  NULL;
 376 #endif
 377         rcu_read_unlock();
 378 }
 379
 380 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 381                                 void *buffer, size_t *lenp, loff_t *ppos)
 382 {
 383         int ret = 0;
 384
 385         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 386
 387         if (write && !ret) {
 388                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 389
 390                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 391         }
 392
 393         return ret;
 394 }
 395
 396 static int proc_udp_early_demux(struct ctl_table *table, int write,
 397                                 void *buffer, size_t *lenp, loff_t *ppos)
 398 {
 399         int ret = 0;
 400
 401         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 402
 403         if (write && !ret) {
 404                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 405
 406                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 407         }
 408
 409         return ret;
 410 }
 411
 412 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 413                                              int write, void *buffer,
 414                                              size_t *lenp, loff_t *ppos)
 415 {
 416         struct net *net = container_of(table->data, struct net,
 417             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 418         int ret;
 419
 420         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 421         if (write && ret == 0)
 422                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 423
 424         return ret;
 425 }
 426
 427 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 428                                   int write, void *buffer, size_t *lenp,
 429                                   loff_t *ppos)
 430 {
 431         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 432         int ret;
 433
 434         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 435         if (!tbl.data)
 436                 return -ENOMEM;
 437         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 438         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 439         kfree(tbl.data);
 440
 441         return ret;
 442 }
 443
 444 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 445 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 446                                           void *buffer, size_t *lenp,
 447                                           loff_t *ppos)
 448 {
 449         struct net *net = container_of(table->data, struct net,
 450             ipv4.sysctl_fib_multipath_hash_policy);
 451         int ret;
 452
 453         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 454         if (write && ret == 0)
 455                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 456
 457         return ret;
 458 }
 459
 460 static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write,
 461                                           void *buffer, size_t *lenp,
 462                                           loff_t *ppos)
 463 {
 464         struct net *net;
 465         int ret;
 466
 467         net = container_of(table->data, struct net,
 468                            ipv4.sysctl_fib_multipath_hash_fields);
 469         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
 470         if (write && ret == 0)
 471                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 472
 473         return ret;
 474 }
 475 #endif
 476
 477 static struct ctl_table ipv4_table[] = {
 478         {
 479                 .procname       = "tcp_max_orphans",
 480                 .data           = &sysctl_tcp_max_orphans,
 481                 .maxlen         = sizeof(int),
 482                 .mode           = 0644,
 483                 .proc_handler   = proc_dointvec
 484         },
 485         {
 486                 .procname       = "inet_peer_threshold",
 487                 .data           = &inet_peer_threshold,
 488                 .maxlen         = sizeof(int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec
 491         },
 492         {
 493                 .procname       = "inet_peer_minttl",
 494                 .data           = &inet_peer_minttl,
 495                 .maxlen         = sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = proc_dointvec_jiffies,
 498         },
 499         {
 500                 .procname       = "inet_peer_maxttl",
 501                 .data           = &inet_peer_maxttl,
 502                 .maxlen         = sizeof(int),
 503                 .mode           = 0644,
 504                 .proc_handler   = proc_dointvec_jiffies,
 505         },
 506         {
 507                 .procname       = "tcp_mem",
 508                 .maxlen         = sizeof(sysctl_tcp_mem),
 509                 .data           = &sysctl_tcp_mem,
 510                 .mode           = 0644,
 511                 .proc_handler   = proc_doulongvec_minmax,
 512         },
 513         {
 514                 .procname       = "tcp_low_latency",
 515                 .data           = &sysctl_tcp_low_latency,
 516                 .maxlen         = sizeof(int),
 517                 .mode           = 0644,
 518                 .proc_handler   = proc_dointvec
 519         },
 520 #ifdef CONFIG_NETLABEL
 521         {
 522                 .procname       = "cipso_cache_enable",
 523                 .data           = &cipso_v4_cache_enabled,
 524                 .maxlen         = sizeof(int),
 525                 .mode           = 0644,
 526                 .proc_handler   = proc_dointvec,
 527         },
 528         {
 529                 .procname       = "cipso_cache_bucket_size",
 530                 .data           = &cipso_v4_cache_bucketsize,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = proc_dointvec,
 534         },
 535         {
 536                 .procname       = "cipso_rbm_optfmt",
 537                 .data           = &cipso_v4_rbm_optfmt,
 538                 .maxlen         = sizeof(int),
 539                 .mode           = 0644,
 540                 .proc_handler   = proc_dointvec,
 541         },
 542         {
 543                 .procname       = "cipso_rbm_strictvalid",
 544                 .data           = &cipso_v4_rbm_strictvalid,
 545                 .maxlen         = sizeof(int),
 546                 .mode           = 0644,
 547                 .proc_handler   = proc_dointvec,
 548         },
 549 #endif /* CONFIG_NETLABEL */
 550         {
 551                 .procname       = "tcp_available_ulp",
 552                 .maxlen         = TCP_ULP_BUF_MAX,
 553                 .mode           = 0444,
 554                 .proc_handler   = proc_tcp_available_ulp,
 555         },
 556         {
 557                 .procname       = "icmp_msgs_per_sec",
 558                 .data           = &sysctl_icmp_msgs_per_sec,
 559                 .maxlen         = sizeof(int),
 560                 .mode           = 0644,
 561                 .proc_handler   = proc_dointvec_minmax,
 562                 .extra1         = SYSCTL_ZERO,
 563         },
 564         {
 565                 .procname       = "icmp_msgs_burst",
 566                 .data           = &sysctl_icmp_msgs_burst,
 567                 .maxlen         = sizeof(int),
 568                 .mode           = 0644,
 569                 .proc_handler   = proc_dointvec_minmax,
 570                 .extra1         = SYSCTL_ZERO,
 571         },
 572         {
 573                 .procname       = "udp_mem",
 574                 .data           = &sysctl_udp_mem,
 575                 .maxlen         = sizeof(sysctl_udp_mem),
 576                 .mode           = 0644,
 577                 .proc_handler   = proc_doulongvec_minmax,
 578         },
 579         {
 580                 .procname       = "fib_sync_mem",
 581                 .data           = &sysctl_fib_sync_mem,
 582                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 583                 .mode           = 0644,
 584                 .proc_handler   = proc_douintvec_minmax,
 585                 .extra1         = &sysctl_fib_sync_mem_min,
 586                 .extra2         = &sysctl_fib_sync_mem_max,
 587         },
 588         { }
 589 };
 590
 591 static struct ctl_table ipv4_net_table[] = {
 592         /* tcp_max_tw_buckets must be first in this table. */
 593         {
 594                 .procname       = "tcp_max_tw_buckets",
 595 /*              .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, */
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dointvec
 599         },
 600         {
 601                 .procname       = "icmp_echo_ignore_all",
 602                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 603                 .maxlen         = sizeof(u8),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dou8vec_minmax,
 606         },
 607         {
 608                 .procname       = "icmp_echo_enable_probe",
 609                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 610                 .maxlen         = sizeof(u8),
 611                 .mode           = 0644,
 612                 .proc_handler   = proc_dou8vec_minmax,
 613                 .extra1         = SYSCTL_ZERO,
 614                 .extra2         = SYSCTL_ONE
 615         },
 616         {
 617                 .procname       = "icmp_echo_ignore_broadcasts",
 618                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 619                 .maxlen         = sizeof(u8),
 620                 .mode           = 0644,
 621                 .proc_handler   = proc_dou8vec_minmax,
 622         },
 623         {
 624                 .procname       = "icmp_ignore_bogus_error_responses",
 625                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 626                 .maxlen         = sizeof(u8),
 627                 .mode           = 0644,
 628                 .proc_handler   = proc_dou8vec_minmax,
 629         },
 630         {
 631                 .procname       = "icmp_errors_use_inbound_ifaddr",
 632                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 633                 .maxlen         = sizeof(u8),
 634                 .mode           = 0644,
 635                 .proc_handler   = proc_dou8vec_minmax,
 636         },
 637         {
 638                 .procname       = "icmp_ratelimit",
 639                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = proc_dointvec_ms_jiffies,
 643         },
 644         {
 645                 .procname       = "icmp_ratemask",
 646                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 647                 .maxlen         = sizeof(int),
 648                 .mode           = 0644,
 649                 .proc_handler   = proc_dointvec
 650         },
 651         {
 652                 .procname       = "ping_group_range",
 653                 .data           = &init_net.ipv4.ping_group_range.range,
 654                 .maxlen         = sizeof(gid_t)*2,
 655                 .mode           = 0644,
 656                 .proc_handler   = ipv4_ping_group_range,
 657         },
 658 #ifdef CONFIG_NET_L3_MASTER_DEV
 659         {
 660                 .procname       = "raw_l3mdev_accept",
 661                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 662                 .maxlen         = sizeof(u8),
 663                 .mode           = 0644,
 664                 .proc_handler   = proc_dou8vec_minmax,
 665                 .extra1         = SYSCTL_ZERO,
 666                 .extra2         = SYSCTL_ONE,
 667         },
 668 #endif
 669         {
 670                 .procname       = "tcp_ecn",
 671                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 672                 .maxlen         = sizeof(u8),
 673                 .mode           = 0644,
 674                 .proc_handler   = proc_dou8vec_minmax,
 675         },
 676         {
 677                 .procname       = "tcp_ecn_fallback",
 678                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 679                 .maxlen         = sizeof(u8),
 680                 .mode           = 0644,
 681                 .proc_handler   = proc_dou8vec_minmax,
 682         },
 683         {
 684                 .procname       = "ip_dynaddr",
 685                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 686                 .maxlen         = sizeof(u8),
 687                 .mode           = 0644,
 688                 .proc_handler   = proc_dou8vec_minmax,
 689         },
 690         {
 691                 .procname       = "ip_early_demux",
 692                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 693                 .maxlen         = sizeof(u8),
 694                 .mode           = 0644,
 695                 .proc_handler   = proc_dou8vec_minmax,
 696         },
 697         {
 698                 .procname       = "udp_early_demux",
 699                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 700                 .maxlen         = sizeof(u8),
 701                 .mode           = 0644,
 702                 .proc_handler   = proc_udp_early_demux
 703         },
 704         {
 705                 .procname       = "tcp_early_demux",
 706                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 707                 .maxlen         = sizeof(u8),
 708                 .mode           = 0644,
 709                 .proc_handler   = proc_tcp_early_demux
 710         },
 711         {
 712                 .procname       = "nexthop_compat_mode",
 713                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 714                 .maxlen         = sizeof(u8),
 715                 .mode           = 0644,
 716                 .proc_handler   = proc_dou8vec_minmax,
 717                 .extra1         = SYSCTL_ZERO,
 718                 .extra2         = SYSCTL_ONE,
 719         },
 720         {
 721                 .procname       = "ip_default_ttl",
 722                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 723                 .maxlen         = sizeof(u8),
 724                 .mode           = 0644,
 725                 .proc_handler   = proc_dou8vec_minmax,
 726                 .extra1         = &ip_ttl_min,
 727                 .extra2         = &ip_ttl_max,
 728         },
 729         {
 730                 .procname       = "ip_local_port_range",
 731                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 732                 .data           = &init_net.ipv4.ip_local_ports.range,
 733                 .mode           = 0644,
 734                 .proc_handler   = ipv4_local_port_range,
 735         },
 736         {
 737                 .procname       = "ip_local_reserved_ports",
 738                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 739                 .maxlen         = 65536,
 740                 .mode           = 0644,
 741                 .proc_handler   = proc_do_large_bitmap,
 742         },
 743         {
 744                 .procname       = "ip_no_pmtu_disc",
 745                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 746                 .maxlen         = sizeof(u8),
 747                 .mode           = 0644,
 748                 .proc_handler   = proc_dou8vec_minmax,
 749         },
 750         {
 751                 .procname       = "ip_forward_use_pmtu",
 752                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 753                 .maxlen         = sizeof(u8),
 754                 .mode           = 0644,
 755                 .proc_handler   = proc_dou8vec_minmax,
 756         },
 757         {
 758                 .procname       = "ip_forward_update_priority",
 759                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 760                 .maxlen         = sizeof(u8),
 761                 .mode           = 0644,
 762                 .proc_handler   = ipv4_fwd_update_priority,
 763                 .extra1         = SYSCTL_ZERO,
 764                 .extra2         = SYSCTL_ONE,
 765         },
 766         {
 767                 .procname       = "ip_nonlocal_bind",
 768                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 769                 .maxlen         = sizeof(u8),
 770                 .mode           = 0644,
 771                 .proc_handler   = proc_dou8vec_minmax,
 772         },
 773         {
 774                 .procname       = "ip_autobind_reuse",
 775                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 776                 .maxlen         = sizeof(u8),
 777                 .mode           = 0644,
 778                 .proc_handler   = proc_dou8vec_minmax,
 779                 .extra1         = SYSCTL_ZERO,
 780                 .extra2         = SYSCTL_ONE,
 781         },
 782         {
 783                 .procname       = "fwmark_reflect",
 784                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 785                 .maxlen         = sizeof(u8),
 786                 .mode           = 0644,
 787                 .proc_handler   = proc_dou8vec_minmax,
 788         },
 789         {
 790                 .procname       = "tcp_fwmark_accept",
 791                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 792                 .maxlen         = sizeof(u8),
 793                 .mode           = 0644,
 794                 .proc_handler   = proc_dou8vec_minmax,
 795         },
 796 #ifdef CONFIG_NET_L3_MASTER_DEV
 797         {
 798                 .procname       = "tcp_l3mdev_accept",
 799                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 800                 .maxlen         = sizeof(u8),
 801                 .mode           = 0644,
 802                 .proc_handler   = proc_dou8vec_minmax,
 803                 .extra1         = SYSCTL_ZERO,
 804                 .extra2         = SYSCTL_ONE,
 805         },
 806 #endif
 807         {
 808                 .procname       = "tcp_mtu_probing",
 809                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 810                 .maxlen         = sizeof(u8),
 811                 .mode           = 0644,
 812                 .proc_handler   = proc_dou8vec_minmax,
 813         },
 814         {
 815                 .procname       = "tcp_base_mss",
 816                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 817                 .maxlen         = sizeof(int),
 818                 .mode           = 0644,
 819                 .proc_handler   = proc_dointvec,
 820         },
 821         {
 822                 .procname       = "tcp_min_snd_mss",
 823                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 824                 .maxlen         = sizeof(int),
 825                 .mode           = 0644,
 826                 .proc_handler   = proc_dointvec_minmax,
 827                 .extra1         = &tcp_min_snd_mss_min,
 828                 .extra2         = &tcp_min_snd_mss_max,
 829         },
 830         {
 831                 .procname       = "tcp_mtu_probe_floor",
 832                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 833                 .maxlen         = sizeof(int),
 834                 .mode           = 0644,
 835                 .proc_handler   = proc_dointvec_minmax,
 836                 .extra1         = &tcp_min_snd_mss_min,
 837                 .extra2         = &tcp_min_snd_mss_max,
 838         },
 839         {
 840                 .procname       = "tcp_probe_threshold",
 841                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 842                 .maxlen         = sizeof(int),
 843                 .mode           = 0644,
 844                 .proc_handler   = proc_dointvec,
 845         },
 846         {
 847                 .procname       = "tcp_probe_interval",
 848                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 849                 .maxlen         = sizeof(u32),
 850                 .mode           = 0644,
 851                 .proc_handler   = proc_douintvec_minmax,
 852                 .extra2         = &u32_max_div_HZ,
 853         },
 854         {
 855                 .procname       = "igmp_link_local_mcast_reports",
 856                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 857                 .maxlen         = sizeof(u8),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_dou8vec_minmax,
 860         },
 861         {
 862                 .procname       = "igmp_max_memberships",
 863                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 864                 .maxlen         = sizeof(int),
 865                 .mode           = 0644,
 866                 .proc_handler   = proc_dointvec
 867         },
 868         {
 869                 .procname       = "igmp_max_msf",
 870                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 871                 .maxlen         = sizeof(int),
 872                 .mode           = 0644,
 873                 .proc_handler   = proc_dointvec
 874         },
 875 #ifdef CONFIG_IP_MULTICAST
 876         {
 877                 .procname       = "igmp_qrv",
 878                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 879                 .maxlen         = sizeof(int),
 880                 .mode           = 0644,
 881                 .proc_handler   = proc_dointvec_minmax,
 882                 .extra1         = SYSCTL_ONE
 883         },
 884 #endif
 885         {
 886                 .procname       = "tcp_congestion_control",
 887                 .data           = &init_net.ipv4.tcp_congestion_control,
 888                 .mode           = 0644,
 889                 .maxlen         = TCP_CA_NAME_MAX,
 890                 .proc_handler   = proc_tcp_congestion_control,
 891         },
 892         {
 893                 .procname       = "tcp_available_congestion_control",
 894                 .maxlen         = TCP_CA_BUF_MAX,
 895                 .mode           = 0444,
 896                 .proc_handler   = proc_tcp_available_congestion_control,
 897         },
 898         {
 899                 .procname       = "tcp_allowed_congestion_control",
 900                 .maxlen         = TCP_CA_BUF_MAX,
 901                 .mode           = 0644,
 902                 .proc_handler   = proc_allowed_congestion_control,
 903         },
 904         {
 905                 .procname       = "tcp_keepalive_time",
 906                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 907                 .maxlen         = sizeof(int),
 908                 .mode           = 0644,
 909                 .proc_handler   = proc_dointvec_jiffies,
 910         },
 911         {
 912                 .procname       = "tcp_keepalive_probes",
 913                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 914                 .maxlen         = sizeof(u8),
 915                 .mode           = 0644,
 916                 .proc_handler   = proc_dou8vec_minmax,
 917         },
 918         {
 919                 .procname       = "tcp_keepalive_intvl",
 920                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 921                 .maxlen         = sizeof(int),
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_dointvec_jiffies,
 924         },
 925         {
 926                 .procname       = "tcp_syn_retries",
 927                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 928                 .maxlen         = sizeof(u8),
 929                 .mode           = 0644,
 930                 .proc_handler   = proc_dou8vec_minmax,
 931                 .extra1         = &tcp_syn_retries_min,
 932                 .extra2         = &tcp_syn_retries_max
 933         },
 934         {
 935                 .procname       = "tcp_synack_retries",
 936                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 937                 .maxlen         = sizeof(u8),
 938                 .mode           = 0644,
 939                 .proc_handler   = proc_dou8vec_minmax,
 940         },
 941 #ifdef CONFIG_SYN_COOKIES
 942         {
 943                 .procname       = "tcp_syncookies",
 944                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 945                 .maxlen         = sizeof(u8),
 946                 .mode           = 0644,
 947                 .proc_handler   = proc_dou8vec_minmax,
 948         },
 949 #endif
 950         {
 951                 .procname       = "tcp_migrate_req",
 952                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 953                 .maxlen         = sizeof(u8),
 954                 .mode           = 0644,
 955                 .proc_handler   = proc_dou8vec_minmax,
 956                 .extra1         = SYSCTL_ZERO,
 957                 .extra2         = SYSCTL_ONE
 958         },
 959         {
 960                 .procname       = "tcp_reordering",
 961                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 962                 .maxlen         = sizeof(int),
 963                 .mode           = 0644,
 964                 .proc_handler   = proc_dointvec
 965         },
 966         {
 967                 .procname       = "tcp_retries1",
 968                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 969                 .maxlen         = sizeof(u8),
 970                 .mode           = 0644,
 971                 .proc_handler   = proc_dou8vec_minmax,
 972                 .extra2         = &tcp_retr1_max
 973         },
 974         {
 975                 .procname       = "tcp_retries2",
 976                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 977                 .maxlen         = sizeof(u8),
 978                 .mode           = 0644,
 979                 .proc_handler   = proc_dou8vec_minmax,
 980         },
 981         {
 982                 .procname       = "tcp_orphan_retries",
 983                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 984                 .maxlen         = sizeof(u8),
 985                 .mode           = 0644,
 986                 .proc_handler   = proc_dou8vec_minmax,
 987         },
 988         {
 989                 .procname       = "tcp_fin_timeout",
 990                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 991                 .maxlen         = sizeof(int),
 992                 .mode           = 0644,
 993                 .proc_handler   = proc_dointvec_jiffies,
 994         },
 995         {
 996                 .procname       = "tcp_notsent_lowat",
 997                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 998                 .maxlen         = sizeof(unsigned int),
 999                 .mode           = 0644,
1000                 .proc_handler   = proc_douintvec,
1001         },
1002         {
1003                 .procname       = "tcp_tw_reuse",
1004                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
1005                 .maxlen         = sizeof(u8),
1006                 .mode           = 0644,
1007                 .proc_handler   = proc_dou8vec_minmax,
1008                 .extra1         = SYSCTL_ZERO,
1009                 .extra2         = &two,
1010         },
1011         {
1012                 .procname       = "tcp_max_syn_backlog",
1013                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1014                 .maxlen         = sizeof(int),
1015                 .mode           = 0644,
1016                 .proc_handler   = proc_dointvec
1017         },
1018         {
1019                 .procname       = "tcp_fastopen",
1020                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1021                 .maxlen         = sizeof(int),
1022                 .mode           = 0644,
1023                 .proc_handler   = proc_dointvec,
1024         },
1025         {
1026                 .procname       = "tcp_fastopen_key",
1027                 .mode           = 0600,
1028                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1029                 /* maxlen to print the list of keys in hex (*2), with dashes
1030                  * separating doublewords and a comma in between keys.
1031                  */
1032                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1033                                    2 * TCP_FASTOPEN_KEY_MAX) +
1034                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1035                 .proc_handler   = proc_tcp_fastopen_key,
1036         },
1037         {
1038                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1039                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1040                 .maxlen         = sizeof(int),
1041                 .mode           = 0644,
1042                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1043                 .extra1         = SYSCTL_ZERO,
1044         },
1045 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1046         {
1047                 .procname       = "fib_multipath_use_neigh",
1048                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1049                 .maxlen         = sizeof(u8),
1050                 .mode           = 0644,
1051                 .proc_handler   = proc_dou8vec_minmax,
1052                 .extra1         = SYSCTL_ZERO,
1053                 .extra2         = SYSCTL_ONE,
1054         },
1055         {
1056                 .procname       = "fib_multipath_hash_policy",
1057                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1058                 .maxlen         = sizeof(u8),
1059                 .mode           = 0644,
1060                 .proc_handler   = proc_fib_multipath_hash_policy,
1061                 .extra1         = SYSCTL_ZERO,
1062                 .extra2         = &three,
1063         },
1064         {
1065                 .procname       = "fib_multipath_hash_fields",
1066                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1067                 .maxlen         = sizeof(u32),
1068                 .mode           = 0644,
1069                 .proc_handler   = proc_fib_multipath_hash_fields,
1070                 .extra1         = SYSCTL_ONE,
1071                 .extra2         = &fib_multipath_hash_fields_all_mask,
1072         },
1073 #endif
1074         {
1075                 .procname       = "ip_unprivileged_port_start",
1076                 .maxlen         = sizeof(int),
1077                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1078                 .mode           = 0644,
1079                 .proc_handler   = ipv4_privileged_ports,
1080         },
1081 #ifdef CONFIG_NET_L3_MASTER_DEV
1082         {
1083                 .procname       = "udp_l3mdev_accept",
1084                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1085                 .maxlen         = sizeof(u8),
1086                 .mode           = 0644,
1087                 .proc_handler   = proc_dou8vec_minmax,
1088                 .extra1         = SYSCTL_ZERO,
1089                 .extra2         = SYSCTL_ONE,
1090         },
1091 #endif
1092         {
1093                 .procname       = "tcp_sack",
1094                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1095                 .maxlen         = sizeof(u8),
1096                 .mode           = 0644,
1097                 .proc_handler   = proc_dou8vec_minmax,
1098         },
1099         {
1100                 .procname       = "tcp_window_scaling",
1101                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1102                 .maxlen         = sizeof(u8),
1103                 .mode           = 0644,
1104                 .proc_handler   = proc_dou8vec_minmax,
1105         },
1106         {
1107                 .procname       = "tcp_timestamps",
1108                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1109                 .maxlen         = sizeof(u8),
1110                 .mode           = 0644,
1111                 .proc_handler   = proc_dou8vec_minmax,
1112         },
1113         {
1114                 .procname       = "tcp_early_retrans",
1115                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1116                 .maxlen         = sizeof(u8),
1117                 .mode           = 0644,
1118                 .proc_handler   = proc_dou8vec_minmax,
1119                 .extra1         = SYSCTL_ZERO,
1120                 .extra2         = &four,
1121         },
1122         {
1123                 .procname       = "tcp_recovery",
1124                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1125                 .maxlen         = sizeof(u8),
1126                 .mode           = 0644,
1127                 .proc_handler   = proc_dou8vec_minmax,
1128         },
1129         {
1130                 .procname       = "tcp_thin_linear_timeouts",
1131                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1132                 .maxlen         = sizeof(u8),
1133                 .mode           = 0644,
1134                 .proc_handler   = proc_dou8vec_minmax,
1135         },
1136         {
1137                 .procname       = "tcp_slow_start_after_idle",
1138                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1139                 .maxlen         = sizeof(u8),
1140                 .mode           = 0644,
1141                 .proc_handler   = proc_dou8vec_minmax,
1142         },
1143         {
1144                 .procname       = "tcp_retrans_collapse",
1145                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1146                 .maxlen         = sizeof(u8),
1147                 .mode           = 0644,
1148                 .proc_handler   = proc_dou8vec_minmax,
1149         },
1150         {
1151                 .procname       = "tcp_stdurg",
1152                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1153                 .maxlen         = sizeof(u8),
1154                 .mode           = 0644,
1155                 .proc_handler   = proc_dou8vec_minmax,
1156         },
1157         {
1158                 .procname       = "tcp_rfc1337",
1159                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1160                 .maxlen         = sizeof(u8),
1161                 .mode           = 0644,
1162                 .proc_handler   = proc_dou8vec_minmax,
1163         },
1164         {
1165                 .procname       = "tcp_abort_on_overflow",
1166                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1167                 .maxlen         = sizeof(u8),
1168                 .mode           = 0644,
1169                 .proc_handler   = proc_dou8vec_minmax,
1170         },
1171         {
1172                 .procname       = "tcp_fack",
1173                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1174                 .maxlen         = sizeof(u8),
1175                 .mode           = 0644,
1176                 .proc_handler   = proc_dou8vec_minmax,
1177         },
1178         {
1179                 .procname       = "tcp_max_reordering",
1180                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1181                 .maxlen         = sizeof(int),
1182                 .mode           = 0644,
1183                 .proc_handler   = proc_dointvec
1184         },
1185         {
1186                 .procname       = "tcp_dsack",
1187                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1188                 .maxlen         = sizeof(u8),
1189                 .mode           = 0644,
1190                 .proc_handler   = proc_dou8vec_minmax,
1191         },
1192         {
1193                 .procname       = "tcp_app_win",
1194                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1195                 .maxlen         = sizeof(u8),
1196                 .mode           = 0644,
1197                 .proc_handler   = proc_dou8vec_minmax,
1198         },
1199         {
1200                 .procname       = "tcp_adv_win_scale",
1201                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1202                 .maxlen         = sizeof(int),
1203                 .mode           = 0644,
1204                 .proc_handler   = proc_dointvec_minmax,
1205                 .extra1         = &tcp_adv_win_scale_min,
1206                 .extra2         = &tcp_adv_win_scale_max,
1207         },
1208         {
1209                 .procname       = "tcp_frto",
1210                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1211                 .maxlen         = sizeof(u8),
1212                 .mode           = 0644,
1213                 .proc_handler   = proc_dou8vec_minmax,
1214         },
1215         {
1216                 .procname       = "tcp_no_metrics_save",
1217                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1218                 .maxlen         = sizeof(u8),
1219                 .mode           = 0644,
1220                 .proc_handler   = proc_dou8vec_minmax,
1221         },
1222         {
1223                 .procname       = "tcp_no_ssthresh_metrics_save",
1224                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1225                 .maxlen         = sizeof(u8),
1226                 .mode           = 0644,
1227                 .proc_handler   = proc_dou8vec_minmax,
1228                 .extra1         = SYSCTL_ZERO,
1229                 .extra2         = SYSCTL_ONE,
1230         },
1231         {
1232                 .procname       = "tcp_moderate_rcvbuf",
1233                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1234                 .maxlen         = sizeof(u8),
1235                 .mode           = 0644,
1236                 .proc_handler   = proc_dou8vec_minmax,
1237         },
1238         {
1239                 .procname       = "tcp_tso_win_divisor",
1240                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1241                 .maxlen         = sizeof(u8),
1242                 .mode           = 0644,
1243                 .proc_handler   = proc_dou8vec_minmax,
1244         },
1245         {
1246                 .procname       = "tcp_workaround_signed_windows",
1247                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1248                 .maxlen         = sizeof(u8),
1249                 .mode           = 0644,
1250                 .proc_handler   = proc_dou8vec_minmax,
1251         },
1252         {
1253                 .procname       = "tcp_limit_output_bytes",
1254                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1255                 .maxlen         = sizeof(int),
1256                 .mode           = 0644,
1257                 .proc_handler   = proc_dointvec
1258         },
1259         {
1260                 .procname       = "tcp_challenge_ack_limit",
1261                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1262                 .maxlen         = sizeof(int),
1263                 .mode           = 0644,
1264                 .proc_handler   = proc_dointvec
1265         },
1266         {
1267                 .procname       = "tcp_min_tso_segs",
1268                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1269                 .maxlen         = sizeof(u8),
1270                 .mode           = 0644,
1271                 .proc_handler   = proc_dou8vec_minmax,
1272                 .extra1         = SYSCTL_ONE,
1273         },
1274         {
1275                 .procname       = "tcp_min_rtt_wlen",
1276                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1277                 .maxlen         = sizeof(int),
1278                 .mode           = 0644,
1279                 .proc_handler   = proc_dointvec_minmax,
1280                 .extra1         = SYSCTL_ZERO,
1281                 .extra2         = &one_day_secs
1282         },
1283         {
1284                 .procname       = "tcp_autocorking",
1285                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1286                 .maxlen         = sizeof(u8),
1287                 .mode           = 0644,
1288                 .proc_handler   = proc_dou8vec_minmax,
1289                 .extra1         = SYSCTL_ZERO,
1290                 .extra2         = SYSCTL_ONE,
1291         },
1292         {
1293                 .procname       = "tcp_invalid_ratelimit",
1294                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1295                 .maxlen         = sizeof(int),
1296                 .mode           = 0644,
1297                 .proc_handler   = proc_dointvec_ms_jiffies,
1298         },
1299         {
1300                 .procname       = "tcp_pacing_ss_ratio",
1301                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1302                 .maxlen         = sizeof(int),
1303                 .mode           = 0644,
1304                 .proc_handler   = proc_dointvec_minmax,
1305                 .extra1         = SYSCTL_ZERO,
1306                 .extra2         = &thousand,
1307         },
1308         {
1309                 .procname       = "tcp_pacing_ca_ratio",
1310                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1311                 .maxlen         = sizeof(int),
1312                 .mode           = 0644,
1313                 .proc_handler   = proc_dointvec_minmax,
1314                 .extra1         = SYSCTL_ZERO,
1315                 .extra2         = &thousand,
1316         },
1317         {
1318                 .procname       = "tcp_wmem",
1319                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1320                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1321                 .mode           = 0644,
1322                 .proc_handler   = proc_dointvec_minmax,
1323                 .extra1         = SYSCTL_ONE,
1324         },
1325         {
1326                 .procname       = "tcp_rmem",
1327                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1328                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1329                 .mode           = 0644,
1330                 .proc_handler   = proc_dointvec_minmax,
1331                 .extra1         = SYSCTL_ONE,
1332         },
1333         {
1334                 .procname       = "tcp_comp_sack_delay_ns",
1335                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1336                 .maxlen         = sizeof(unsigned long),
1337                 .mode           = 0644,
1338                 .proc_handler   = proc_doulongvec_minmax,
1339         },
1340         {
1341                 .procname       = "tcp_comp_sack_slack_ns",
1342                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1343                 .maxlen         = sizeof(unsigned long),
1344                 .mode           = 0644,
1345                 .proc_handler   = proc_doulongvec_minmax,
1346         },
1347         {
1348                 .procname       = "tcp_comp_sack_nr",
1349                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1350                 .maxlen         = sizeof(u8),
1351                 .mode           = 0644,
1352                 .proc_handler   = proc_dou8vec_minmax,
1353                 .extra1         = SYSCTL_ZERO,
1354         },
1355         {
1356                 .procname       = "tcp_reflect_tos",
1357                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1358                 .maxlen         = sizeof(u8),
1359                 .mode           = 0644,
1360                 .proc_handler   = proc_dou8vec_minmax,
1361                 .extra1         = SYSCTL_ZERO,
1362                 .extra2         = SYSCTL_ONE,
1363         },
1364         {
1365                 .procname       = "udp_rmem_min",
1366                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1367                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1368                 .mode           = 0644,
1369                 .proc_handler   = proc_dointvec_minmax,
1370                 .extra1         = SYSCTL_ONE
1371         },
1372         {
1373                 .procname       = "udp_wmem_min",
1374                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1375                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1376                 .mode           = 0644,
1377                 .proc_handler   = proc_dointvec_minmax,
1378                 .extra1         = SYSCTL_ONE
1379         },
1380         {
1381                 .procname       = "fib_notify_on_flag_change",
1382                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1383                 .maxlen         = sizeof(u8),
1384                 .mode           = 0644,
1385                 .proc_handler   = proc_dou8vec_minmax,
1386                 .extra1         = SYSCTL_ZERO,
1387                 .extra2         = &two,
1388         },
1389         { }
1390 };
1391
1392 static __net_init int ipv4_sysctl_init_net(struct net *net)
1393 {
1394         struct ctl_table *table;
1395
1396         table = ipv4_net_table;
1397         if (!net_eq(net, &init_net)) {
1398                 int i;
1399
1400                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1401                 if (!table)
1402                         goto err_alloc;
1403
1404                 /* skip first entry (sysctl_max_tw_buckets) */
1405                 for (i = 1; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1406                         if (table[i].data) {
1407                                 /* Update the variables to point into
1408                                  * the current struct net
1409                                  */
1410                                 table[i].data += (void *)net - (void *)&init_net;
1411                         } else {
1412                                 /* Entries without data pointer are global;
1413                                  * Make them read-only in non-init_net ns
1414                                  */
1415                                 table[i].mode &= ~0222;
1416                         }
1417                 }
1418         }
1419
1420         table[0].data = &net->ipv4.tcp_death_row->sysctl_max_tw_buckets;
1421
1422         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1423         if (!net->ipv4.ipv4_hdr)
1424                 goto err_reg;
1425
1426         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1427         if (!net->ipv4.sysctl_local_reserved_ports)
1428                 goto err_ports;
1429
1430         return 0;
1431
1432 err_ports:
1433         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1434 err_reg:
1435         if (!net_eq(net, &init_net))
1436                 kfree(table);
1437 err_alloc:
1438         return -ENOMEM;
1439 }
1440
1441 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1442 {
1443         struct ctl_table *table;
1444
1445         kfree(net->ipv4.sysctl_local_reserved_ports);
1446         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1447         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1448         kfree(table);
1449 }
1450
1451 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1452         .init = ipv4_sysctl_init_net,
1453         .exit = ipv4_sysctl_exit_net,
1454 };
1455
1456 static __init int sysctl_ipv4_init(void)
1457 {
1458         struct ctl_table_header *hdr;
1459
1460         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1461         if (!hdr)
1462                 return -ENOMEM;
1463
1464         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1465                 unregister_net_sysctl_table(hdr);
1466                 return -ENOMEM;
1467         }
1468
1469         return 0;
1470 }
1471
1472 __initcall(sysctl_ipv4_init);