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         {
 593                 .procname       = "icmp_echo_ignore_all",
 594                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 595                 .maxlen         = sizeof(u8),
 596                 .mode           = 0644,
 597                 .proc_handler   = proc_dou8vec_minmax,
 598         },
 599         {
 600                 .procname       = "icmp_echo_enable_probe",
 601                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 602                 .maxlen         = sizeof(u8),
 603                 .mode           = 0644,
 604                 .proc_handler   = proc_dou8vec_minmax,
 605                 .extra1         = SYSCTL_ZERO,
 606                 .extra2         = SYSCTL_ONE
 607         },
 608         {
 609                 .procname       = "icmp_echo_ignore_broadcasts",
 610                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 611                 .maxlen         = sizeof(u8),
 612                 .mode           = 0644,
 613                 .proc_handler   = proc_dou8vec_minmax,
 614         },
 615         {
 616                 .procname       = "icmp_ignore_bogus_error_responses",
 617                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 618                 .maxlen         = sizeof(u8),
 619                 .mode           = 0644,
 620                 .proc_handler   = proc_dou8vec_minmax,
 621         },
 622         {
 623                 .procname       = "icmp_errors_use_inbound_ifaddr",
 624                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 625                 .maxlen         = sizeof(u8),
 626                 .mode           = 0644,
 627                 .proc_handler   = proc_dou8vec_minmax,
 628         },
 629         {
 630                 .procname       = "icmp_ratelimit",
 631                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 632                 .maxlen         = sizeof(int),
 633                 .mode           = 0644,
 634                 .proc_handler   = proc_dointvec_ms_jiffies,
 635         },
 636         {
 637                 .procname       = "icmp_ratemask",
 638                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 .proc_handler   = proc_dointvec
 642         },
 643         {
 644                 .procname       = "ping_group_range",
 645                 .data           = &init_net.ipv4.ping_group_range.range,
 646                 .maxlen         = sizeof(gid_t)*2,
 647                 .mode           = 0644,
 648                 .proc_handler   = ipv4_ping_group_range,
 649         },
 650 #ifdef CONFIG_NET_L3_MASTER_DEV
 651         {
 652                 .procname       = "raw_l3mdev_accept",
 653                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 654                 .maxlen         = sizeof(u8),
 655                 .mode           = 0644,
 656                 .proc_handler   = proc_dou8vec_minmax,
 657                 .extra1         = SYSCTL_ZERO,
 658                 .extra2         = SYSCTL_ONE,
 659         },
 660 #endif
 661         {
 662                 .procname       = "tcp_ecn",
 663                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 664                 .maxlen         = sizeof(u8),
 665                 .mode           = 0644,
 666                 .proc_handler   = proc_dou8vec_minmax,
 667         },
 668         {
 669                 .procname       = "tcp_ecn_fallback",
 670                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 671                 .maxlen         = sizeof(u8),
 672                 .mode           = 0644,
 673                 .proc_handler   = proc_dou8vec_minmax,
 674         },
 675         {
 676                 .procname       = "ip_dynaddr",
 677                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 678                 .maxlen         = sizeof(u8),
 679                 .mode           = 0644,
 680                 .proc_handler   = proc_dou8vec_minmax,
 681         },
 682         {
 683                 .procname       = "ip_early_demux",
 684                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 685                 .maxlen         = sizeof(u8),
 686                 .mode           = 0644,
 687                 .proc_handler   = proc_dou8vec_minmax,
 688         },
 689         {
 690                 .procname       = "udp_early_demux",
 691                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 692                 .maxlen         = sizeof(u8),
 693                 .mode           = 0644,
 694                 .proc_handler   = proc_udp_early_demux
 695         },
 696         {
 697                 .procname       = "tcp_early_demux",
 698                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 699                 .maxlen         = sizeof(u8),
 700                 .mode           = 0644,
 701                 .proc_handler   = proc_tcp_early_demux
 702         },
 703         {
 704                 .procname       = "nexthop_compat_mode",
 705                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 706                 .maxlen         = sizeof(u8),
 707                 .mode           = 0644,
 708                 .proc_handler   = proc_dou8vec_minmax,
 709                 .extra1         = SYSCTL_ZERO,
 710                 .extra2         = SYSCTL_ONE,
 711         },
 712         {
 713                 .procname       = "ip_default_ttl",
 714                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 715                 .maxlen         = sizeof(u8),
 716                 .mode           = 0644,
 717                 .proc_handler   = proc_dou8vec_minmax,
 718                 .extra1         = &ip_ttl_min,
 719                 .extra2         = &ip_ttl_max,
 720         },
 721         {
 722                 .procname       = "ip_local_port_range",
 723                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 724                 .data           = &init_net.ipv4.ip_local_ports.range,
 725                 .mode           = 0644,
 726                 .proc_handler   = ipv4_local_port_range,
 727         },
 728         {
 729                 .procname       = "ip_local_reserved_ports",
 730                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 731                 .maxlen         = 65536,
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_do_large_bitmap,
 734         },
 735         {
 736                 .procname       = "ip_no_pmtu_disc",
 737                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 738                 .maxlen         = sizeof(u8),
 739                 .mode           = 0644,
 740                 .proc_handler   = proc_dou8vec_minmax,
 741         },
 742         {
 743                 .procname       = "ip_forward_use_pmtu",
 744                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 745                 .maxlen         = sizeof(u8),
 746                 .mode           = 0644,
 747                 .proc_handler   = proc_dou8vec_minmax,
 748         },
 749         {
 750                 .procname       = "ip_forward_update_priority",
 751                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 752                 .maxlen         = sizeof(u8),
 753                 .mode           = 0644,
 754                 .proc_handler   = ipv4_fwd_update_priority,
 755                 .extra1         = SYSCTL_ZERO,
 756                 .extra2         = SYSCTL_ONE,
 757         },
 758         {
 759                 .procname       = "ip_nonlocal_bind",
 760                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 761                 .maxlen         = sizeof(u8),
 762                 .mode           = 0644,
 763                 .proc_handler   = proc_dou8vec_minmax,
 764         },
 765         {
 766                 .procname       = "ip_autobind_reuse",
 767                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 768                 .maxlen         = sizeof(u8),
 769                 .mode           = 0644,
 770                 .proc_handler   = proc_dou8vec_minmax,
 771                 .extra1         = SYSCTL_ZERO,
 772                 .extra2         = SYSCTL_ONE,
 773         },
 774         {
 775                 .procname       = "fwmark_reflect",
 776                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 777                 .maxlen         = sizeof(u8),
 778                 .mode           = 0644,
 779                 .proc_handler   = proc_dou8vec_minmax,
 780         },
 781         {
 782                 .procname       = "tcp_fwmark_accept",
 783                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 784                 .maxlen         = sizeof(u8),
 785                 .mode           = 0644,
 786                 .proc_handler   = proc_dou8vec_minmax,
 787         },
 788 #ifdef CONFIG_NET_L3_MASTER_DEV
 789         {
 790                 .procname       = "tcp_l3mdev_accept",
 791                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 792                 .maxlen         = sizeof(u8),
 793                 .mode           = 0644,
 794                 .proc_handler   = proc_dou8vec_minmax,
 795                 .extra1         = SYSCTL_ZERO,
 796                 .extra2         = SYSCTL_ONE,
 797         },
 798 #endif
 799         {
 800                 .procname       = "tcp_mtu_probing",
 801                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 802                 .maxlen         = sizeof(u8),
 803                 .mode           = 0644,
 804                 .proc_handler   = proc_dou8vec_minmax,
 805         },
 806         {
 807                 .procname       = "tcp_base_mss",
 808                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 809                 .maxlen         = sizeof(int),
 810                 .mode           = 0644,
 811                 .proc_handler   = proc_dointvec,
 812         },
 813         {
 814                 .procname       = "tcp_min_snd_mss",
 815                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 816                 .maxlen         = sizeof(int),
 817                 .mode           = 0644,
 818                 .proc_handler   = proc_dointvec_minmax,
 819                 .extra1         = &tcp_min_snd_mss_min,
 820                 .extra2         = &tcp_min_snd_mss_max,
 821         },
 822         {
 823                 .procname       = "tcp_mtu_probe_floor",
 824                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 825                 .maxlen         = sizeof(int),
 826                 .mode           = 0644,
 827                 .proc_handler   = proc_dointvec_minmax,
 828                 .extra1         = &tcp_min_snd_mss_min,
 829                 .extra2         = &tcp_min_snd_mss_max,
 830         },
 831         {
 832                 .procname       = "tcp_probe_threshold",
 833                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 834                 .maxlen         = sizeof(int),
 835                 .mode           = 0644,
 836                 .proc_handler   = proc_dointvec,
 837         },
 838         {
 839                 .procname       = "tcp_probe_interval",
 840                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 841                 .maxlen         = sizeof(u32),
 842                 .mode           = 0644,
 843                 .proc_handler   = proc_douintvec_minmax,
 844                 .extra2         = &u32_max_div_HZ,
 845         },
 846         {
 847                 .procname       = "igmp_link_local_mcast_reports",
 848                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 849                 .maxlen         = sizeof(u8),
 850                 .mode           = 0644,
 851                 .proc_handler   = proc_dou8vec_minmax,
 852         },
 853         {
 854                 .procname       = "igmp_max_memberships",
 855                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 856                 .maxlen         = sizeof(int),
 857                 .mode           = 0644,
 858                 .proc_handler   = proc_dointvec
 859         },
 860         {
 861                 .procname       = "igmp_max_msf",
 862                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 863                 .maxlen         = sizeof(int),
 864                 .mode           = 0644,
 865                 .proc_handler   = proc_dointvec
 866         },
 867 #ifdef CONFIG_IP_MULTICAST
 868         {
 869                 .procname       = "igmp_qrv",
 870                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 871                 .maxlen         = sizeof(int),
 872                 .mode           = 0644,
 873                 .proc_handler   = proc_dointvec_minmax,
 874                 .extra1         = SYSCTL_ONE
 875         },
 876 #endif
 877         {
 878                 .procname       = "tcp_congestion_control",
 879                 .data           = &init_net.ipv4.tcp_congestion_control,
 880                 .mode           = 0644,
 881                 .maxlen         = TCP_CA_NAME_MAX,
 882                 .proc_handler   = proc_tcp_congestion_control,
 883         },
 884         {
 885                 .procname       = "tcp_available_congestion_control",
 886                 .maxlen         = TCP_CA_BUF_MAX,
 887                 .mode           = 0444,
 888                 .proc_handler   = proc_tcp_available_congestion_control,
 889         },
 890         {
 891                 .procname       = "tcp_allowed_congestion_control",
 892                 .maxlen         = TCP_CA_BUF_MAX,
 893                 .mode           = 0644,
 894                 .proc_handler   = proc_allowed_congestion_control,
 895         },
 896         {
 897                 .procname       = "tcp_keepalive_time",
 898                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 899                 .maxlen         = sizeof(int),
 900                 .mode           = 0644,
 901                 .proc_handler   = proc_dointvec_jiffies,
 902         },
 903         {
 904                 .procname       = "tcp_keepalive_probes",
 905                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 906                 .maxlen         = sizeof(u8),
 907                 .mode           = 0644,
 908                 .proc_handler   = proc_dou8vec_minmax,
 909         },
 910         {
 911                 .procname       = "tcp_keepalive_intvl",
 912                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 913                 .maxlen         = sizeof(int),
 914                 .mode           = 0644,
 915                 .proc_handler   = proc_dointvec_jiffies,
 916         },
 917         {
 918                 .procname       = "tcp_syn_retries",
 919                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 920                 .maxlen         = sizeof(u8),
 921                 .mode           = 0644,
 922                 .proc_handler   = proc_dou8vec_minmax,
 923                 .extra1         = &tcp_syn_retries_min,
 924                 .extra2         = &tcp_syn_retries_max
 925         },
 926         {
 927                 .procname       = "tcp_synack_retries",
 928                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 929                 .maxlen         = sizeof(u8),
 930                 .mode           = 0644,
 931                 .proc_handler   = proc_dou8vec_minmax,
 932         },
 933 #ifdef CONFIG_SYN_COOKIES
 934         {
 935                 .procname       = "tcp_syncookies",
 936                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 937                 .maxlen         = sizeof(u8),
 938                 .mode           = 0644,
 939                 .proc_handler   = proc_dou8vec_minmax,
 940         },
 941 #endif
 942         {
 943                 .procname       = "tcp_migrate_req",
 944                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 945                 .maxlen         = sizeof(u8),
 946                 .mode           = 0644,
 947                 .proc_handler   = proc_dou8vec_minmax,
 948                 .extra1         = SYSCTL_ZERO,
 949                 .extra2         = SYSCTL_ONE
 950         },
 951         {
 952                 .procname       = "tcp_reordering",
 953                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 954                 .maxlen         = sizeof(int),
 955                 .mode           = 0644,
 956                 .proc_handler   = proc_dointvec
 957         },
 958         {
 959                 .procname       = "tcp_retries1",
 960                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 961                 .maxlen         = sizeof(u8),
 962                 .mode           = 0644,
 963                 .proc_handler   = proc_dou8vec_minmax,
 964                 .extra2         = &tcp_retr1_max
 965         },
 966         {
 967                 .procname       = "tcp_retries2",
 968                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 969                 .maxlen         = sizeof(u8),
 970                 .mode           = 0644,
 971                 .proc_handler   = proc_dou8vec_minmax,
 972         },
 973         {
 974                 .procname       = "tcp_orphan_retries",
 975                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 976                 .maxlen         = sizeof(u8),
 977                 .mode           = 0644,
 978                 .proc_handler   = proc_dou8vec_minmax,
 979         },
 980         {
 981                 .procname       = "tcp_fin_timeout",
 982                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 983                 .maxlen         = sizeof(int),
 984                 .mode           = 0644,
 985                 .proc_handler   = proc_dointvec_jiffies,
 986         },
 987         {
 988                 .procname       = "tcp_notsent_lowat",
 989                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 990                 .maxlen         = sizeof(unsigned int),
 991                 .mode           = 0644,
 992                 .proc_handler   = proc_douintvec,
 993         },
 994         {
 995                 .procname       = "tcp_tw_reuse",
 996                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 997                 .maxlen         = sizeof(u8),
 998                 .mode           = 0644,
 999                 .proc_handler   = proc_dou8vec_minmax,
1000                 .extra1         = SYSCTL_ZERO,
1001                 .extra2         = &two,
1002         },
1003         {
1004                 .procname       = "tcp_max_tw_buckets",
1005                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
1006                 .maxlen         = sizeof(int),
1007                 .mode           = 0644,
1008                 .proc_handler   = proc_dointvec
1009         },
1010         {
1011                 .procname       = "tcp_max_syn_backlog",
1012                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1013                 .maxlen         = sizeof(int),
1014                 .mode           = 0644,
1015                 .proc_handler   = proc_dointvec
1016         },
1017         {
1018                 .procname       = "tcp_fastopen",
1019                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1020                 .maxlen         = sizeof(int),
1021                 .mode           = 0644,
1022                 .proc_handler   = proc_dointvec,
1023         },
1024         {
1025                 .procname       = "tcp_fastopen_key",
1026                 .mode           = 0600,
1027                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1028                 /* maxlen to print the list of keys in hex (*2), with dashes
1029                  * separating doublewords and a comma in between keys.
1030                  */
1031                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1032                                    2 * TCP_FASTOPEN_KEY_MAX) +
1033                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1034                 .proc_handler   = proc_tcp_fastopen_key,
1035         },
1036         {
1037                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1038                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1039                 .maxlen         = sizeof(int),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1042                 .extra1         = SYSCTL_ZERO,
1043         },
1044 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1045         {
1046                 .procname       = "fib_multipath_use_neigh",
1047                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1048                 .maxlen         = sizeof(u8),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_dou8vec_minmax,
1051                 .extra1         = SYSCTL_ZERO,
1052                 .extra2         = SYSCTL_ONE,
1053         },
1054         {
1055                 .procname       = "fib_multipath_hash_policy",
1056                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1057                 .maxlen         = sizeof(u8),
1058                 .mode           = 0644,
1059                 .proc_handler   = proc_fib_multipath_hash_policy,
1060                 .extra1         = SYSCTL_ZERO,
1061                 .extra2         = &three,
1062         },
1063         {
1064                 .procname       = "fib_multipath_hash_fields",
1065                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1066                 .maxlen         = sizeof(u32),
1067                 .mode           = 0644,
1068                 .proc_handler   = proc_fib_multipath_hash_fields,
1069                 .extra1         = SYSCTL_ONE,
1070                 .extra2         = &fib_multipath_hash_fields_all_mask,
1071         },
1072 #endif
1073         {
1074                 .procname       = "ip_unprivileged_port_start",
1075                 .maxlen         = sizeof(int),
1076                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1077                 .mode           = 0644,
1078                 .proc_handler   = ipv4_privileged_ports,
1079         },
1080 #ifdef CONFIG_NET_L3_MASTER_DEV
1081         {
1082                 .procname       = "udp_l3mdev_accept",
1083                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1084                 .maxlen         = sizeof(u8),
1085                 .mode           = 0644,
1086                 .proc_handler   = proc_dou8vec_minmax,
1087                 .extra1         = SYSCTL_ZERO,
1088                 .extra2         = SYSCTL_ONE,
1089         },
1090 #endif
1091         {
1092                 .procname       = "tcp_sack",
1093                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1094                 .maxlen         = sizeof(u8),
1095                 .mode           = 0644,
1096                 .proc_handler   = proc_dou8vec_minmax,
1097         },
1098         {
1099                 .procname       = "tcp_window_scaling",
1100                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1101                 .maxlen         = sizeof(u8),
1102                 .mode           = 0644,
1103                 .proc_handler   = proc_dou8vec_minmax,
1104         },
1105         {
1106                 .procname       = "tcp_timestamps",
1107                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1108                 .maxlen         = sizeof(u8),
1109                 .mode           = 0644,
1110                 .proc_handler   = proc_dou8vec_minmax,
1111         },
1112         {
1113                 .procname       = "tcp_early_retrans",
1114                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1115                 .maxlen         = sizeof(u8),
1116                 .mode           = 0644,
1117                 .proc_handler   = proc_dou8vec_minmax,
1118                 .extra1         = SYSCTL_ZERO,
1119                 .extra2         = &four,
1120         },
1121         {
1122                 .procname       = "tcp_recovery",
1123                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1124                 .maxlen         = sizeof(u8),
1125                 .mode           = 0644,
1126                 .proc_handler   = proc_dou8vec_minmax,
1127         },
1128         {
1129                 .procname       = "tcp_thin_linear_timeouts",
1130                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1131                 .maxlen         = sizeof(u8),
1132                 .mode           = 0644,
1133                 .proc_handler   = proc_dou8vec_minmax,
1134         },
1135         {
1136                 .procname       = "tcp_slow_start_after_idle",
1137                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1138                 .maxlen         = sizeof(u8),
1139                 .mode           = 0644,
1140                 .proc_handler   = proc_dou8vec_minmax,
1141         },
1142         {
1143                 .procname       = "tcp_retrans_collapse",
1144                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1145                 .maxlen         = sizeof(u8),
1146                 .mode           = 0644,
1147                 .proc_handler   = proc_dou8vec_minmax,
1148         },
1149         {
1150                 .procname       = "tcp_stdurg",
1151                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1152                 .maxlen         = sizeof(u8),
1153                 .mode           = 0644,
1154                 .proc_handler   = proc_dou8vec_minmax,
1155         },
1156         {
1157                 .procname       = "tcp_rfc1337",
1158                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1159                 .maxlen         = sizeof(u8),
1160                 .mode           = 0644,
1161                 .proc_handler   = proc_dou8vec_minmax,
1162         },
1163         {
1164                 .procname       = "tcp_abort_on_overflow",
1165                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1166                 .maxlen         = sizeof(u8),
1167                 .mode           = 0644,
1168                 .proc_handler   = proc_dou8vec_minmax,
1169         },
1170         {
1171                 .procname       = "tcp_fack",
1172                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1173                 .maxlen         = sizeof(u8),
1174                 .mode           = 0644,
1175                 .proc_handler   = proc_dou8vec_minmax,
1176         },
1177         {
1178                 .procname       = "tcp_max_reordering",
1179                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1180                 .maxlen         = sizeof(int),
1181                 .mode           = 0644,
1182                 .proc_handler   = proc_dointvec
1183         },
1184         {
1185                 .procname       = "tcp_dsack",
1186                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1187                 .maxlen         = sizeof(u8),
1188                 .mode           = 0644,
1189                 .proc_handler   = proc_dou8vec_minmax,
1190         },
1191         {
1192                 .procname       = "tcp_app_win",
1193                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1194                 .maxlen         = sizeof(u8),
1195                 .mode           = 0644,
1196                 .proc_handler   = proc_dou8vec_minmax,
1197         },
1198         {
1199                 .procname       = "tcp_adv_win_scale",
1200                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1201                 .maxlen         = sizeof(int),
1202                 .mode           = 0644,
1203                 .proc_handler   = proc_dointvec_minmax,
1204                 .extra1         = &tcp_adv_win_scale_min,
1205                 .extra2         = &tcp_adv_win_scale_max,
1206         },
1207         {
1208                 .procname       = "tcp_frto",
1209                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1210                 .maxlen         = sizeof(u8),
1211                 .mode           = 0644,
1212                 .proc_handler   = proc_dou8vec_minmax,
1213         },
1214         {
1215                 .procname       = "tcp_no_metrics_save",
1216                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1217                 .maxlen         = sizeof(u8),
1218                 .mode           = 0644,
1219                 .proc_handler   = proc_dou8vec_minmax,
1220         },
1221         {
1222                 .procname       = "tcp_no_ssthresh_metrics_save",
1223                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1224                 .maxlen         = sizeof(u8),
1225                 .mode           = 0644,
1226                 .proc_handler   = proc_dou8vec_minmax,
1227                 .extra1         = SYSCTL_ZERO,
1228                 .extra2         = SYSCTL_ONE,
1229         },
1230         {
1231                 .procname       = "tcp_moderate_rcvbuf",
1232                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1233                 .maxlen         = sizeof(u8),
1234                 .mode           = 0644,
1235                 .proc_handler   = proc_dou8vec_minmax,
1236         },
1237         {
1238                 .procname       = "tcp_tso_win_divisor",
1239                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1240                 .maxlen         = sizeof(u8),
1241                 .mode           = 0644,
1242                 .proc_handler   = proc_dou8vec_minmax,
1243         },
1244         {
1245                 .procname       = "tcp_workaround_signed_windows",
1246                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1247                 .maxlen         = sizeof(u8),
1248                 .mode           = 0644,
1249                 .proc_handler   = proc_dou8vec_minmax,
1250         },
1251         {
1252                 .procname       = "tcp_limit_output_bytes",
1253                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1254                 .maxlen         = sizeof(int),
1255                 .mode           = 0644,
1256                 .proc_handler   = proc_dointvec
1257         },
1258         {
1259                 .procname       = "tcp_challenge_ack_limit",
1260                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1261                 .maxlen         = sizeof(int),
1262                 .mode           = 0644,
1263                 .proc_handler   = proc_dointvec
1264         },
1265         {
1266                 .procname       = "tcp_min_tso_segs",
1267                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1268                 .maxlen         = sizeof(u8),
1269                 .mode           = 0644,
1270                 .proc_handler   = proc_dou8vec_minmax,
1271                 .extra1         = SYSCTL_ONE,
1272         },
1273         {
1274                 .procname       = "tcp_min_rtt_wlen",
1275                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1276                 .maxlen         = sizeof(int),
1277                 .mode           = 0644,
1278                 .proc_handler   = proc_dointvec_minmax,
1279                 .extra1         = SYSCTL_ZERO,
1280                 .extra2         = &one_day_secs
1281         },
1282         {
1283                 .procname       = "tcp_autocorking",
1284                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1285                 .maxlen         = sizeof(u8),
1286                 .mode           = 0644,
1287                 .proc_handler   = proc_dou8vec_minmax,
1288                 .extra1         = SYSCTL_ZERO,
1289                 .extra2         = SYSCTL_ONE,
1290         },
1291         {
1292                 .procname       = "tcp_invalid_ratelimit",
1293                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1294                 .maxlen         = sizeof(int),
1295                 .mode           = 0644,
1296                 .proc_handler   = proc_dointvec_ms_jiffies,
1297         },
1298         {
1299                 .procname       = "tcp_pacing_ss_ratio",
1300                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1301                 .maxlen         = sizeof(int),
1302                 .mode           = 0644,
1303                 .proc_handler   = proc_dointvec_minmax,
1304                 .extra1         = SYSCTL_ZERO,
1305                 .extra2         = &thousand,
1306         },
1307         {
1308                 .procname       = "tcp_pacing_ca_ratio",
1309                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1310                 .maxlen         = sizeof(int),
1311                 .mode           = 0644,
1312                 .proc_handler   = proc_dointvec_minmax,
1313                 .extra1         = SYSCTL_ZERO,
1314                 .extra2         = &thousand,
1315         },
1316         {
1317                 .procname       = "tcp_wmem",
1318                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1319                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1320                 .mode           = 0644,
1321                 .proc_handler   = proc_dointvec_minmax,
1322                 .extra1         = SYSCTL_ONE,
1323         },
1324         {
1325                 .procname       = "tcp_rmem",
1326                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1327                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1328                 .mode           = 0644,
1329                 .proc_handler   = proc_dointvec_minmax,
1330                 .extra1         = SYSCTL_ONE,
1331         },
1332         {
1333                 .procname       = "tcp_comp_sack_delay_ns",
1334                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1335                 .maxlen         = sizeof(unsigned long),
1336                 .mode           = 0644,
1337                 .proc_handler   = proc_doulongvec_minmax,
1338         },
1339         {
1340                 .procname       = "tcp_comp_sack_slack_ns",
1341                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1342                 .maxlen         = sizeof(unsigned long),
1343                 .mode           = 0644,
1344                 .proc_handler   = proc_doulongvec_minmax,
1345         },
1346         {
1347                 .procname       = "tcp_comp_sack_nr",
1348                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1349                 .maxlen         = sizeof(u8),
1350                 .mode           = 0644,
1351                 .proc_handler   = proc_dou8vec_minmax,
1352                 .extra1         = SYSCTL_ZERO,
1353         },
1354         {
1355                 .procname       = "tcp_reflect_tos",
1356                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1357                 .maxlen         = sizeof(u8),
1358                 .mode           = 0644,
1359                 .proc_handler   = proc_dou8vec_minmax,
1360                 .extra1         = SYSCTL_ZERO,
1361                 .extra2         = SYSCTL_ONE,
1362         },
1363         {
1364                 .procname       = "udp_rmem_min",
1365                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1366                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1367                 .mode           = 0644,
1368                 .proc_handler   = proc_dointvec_minmax,
1369                 .extra1         = SYSCTL_ONE
1370         },
1371         {
1372                 .procname       = "udp_wmem_min",
1373                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1374                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1375                 .mode           = 0644,
1376                 .proc_handler   = proc_dointvec_minmax,
1377                 .extra1         = SYSCTL_ONE
1378         },
1379         {
1380                 .procname       = "fib_notify_on_flag_change",
1381                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1382                 .maxlen         = sizeof(u8),
1383                 .mode           = 0644,
1384                 .proc_handler   = proc_dou8vec_minmax,
1385                 .extra1         = SYSCTL_ZERO,
1386                 .extra2         = &two,
1387         },
1388         { }
1389 };
1390
1391 static __net_init int ipv4_sysctl_init_net(struct net *net)
1392 {
1393         struct ctl_table *table;
1394
1395         table = ipv4_net_table;
1396         if (!net_eq(net, &init_net)) {
1397                 int i;
1398
1399                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1400                 if (!table)
1401                         goto err_alloc;
1402
1403                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1404                         if (table[i].data) {
1405                                 /* Update the variables to point into
1406                                  * the current struct net
1407                                  */
1408                                 table[i].data += (void *)net - (void *)&init_net;
1409                         } else {
1410                                 /* Entries without data pointer are global;
1411                                  * Make them read-only in non-init_net ns
1412                                  */
1413                                 table[i].mode &= ~0222;
1414                         }
1415                 }
1416         }
1417
1418         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1419         if (!net->ipv4.ipv4_hdr)
1420                 goto err_reg;
1421
1422         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1423         if (!net->ipv4.sysctl_local_reserved_ports)
1424                 goto err_ports;
1425
1426         return 0;
1427
1428 err_ports:
1429         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1430 err_reg:
1431         if (!net_eq(net, &init_net))
1432                 kfree(table);
1433 err_alloc:
1434         return -ENOMEM;
1435 }
1436
1437 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1438 {
1439         struct ctl_table *table;
1440
1441         kfree(net->ipv4.sysctl_local_reserved_ports);
1442         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1443         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1444         kfree(table);
1445 }
1446
1447 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1448         .init = ipv4_sysctl_init_net,
1449         .exit = ipv4_sysctl_exit_net,
1450 };
1451
1452 static __init int sysctl_ipv4_init(void)
1453 {
1454         struct ctl_table_header *hdr;
1455
1456         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1457         if (!hdr)
1458                 return -ENOMEM;
1459
1460         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1461                 unregister_net_sysctl_table(hdr);
1462                 return -ENOMEM;
1463         }
1464
1465         return 0;
1466 }
1467
1468 __initcall(sysctl_ipv4_init);