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 tcp_retr1_max = 255;
  24 static int ip_local_port_range_min[] = { 1, 1 };
  25 static int ip_local_port_range_max[] = { 65535, 65535 };
  26 static int tcp_adv_win_scale_min = -31;
  27 static int tcp_adv_win_scale_max = 31;
  28 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  29 static int tcp_min_snd_mss_max = 65535;
  30 static int ip_privileged_port_min;
  31 static int ip_privileged_port_max = 65535;
  32 static int ip_ttl_min = 1;
  33 static int ip_ttl_max = 255;
  34 static int tcp_syn_retries_min = 1;
  35 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  36 static int ip_ping_group_range_min[] = { 0, 0 };
  37 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  38 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  39 static int one_day_secs = 24 * 3600;
  40 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
  41         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
  42
  43 /* obsolete */
  44 static int sysctl_tcp_low_latency __read_mostly;
  45
  46 /* Update system visible IP port range */
  47 static void set_local_port_range(struct net *net, int range[2])
  48 {
  49         bool same_parity = !((range[0] ^ range[1]) & 1);
  50
  51         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  52         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  53                 net->ipv4.ip_local_ports.warned = true;
  54                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  55         }
  56         net->ipv4.ip_local_ports.range[0] = range[0];
  57         net->ipv4.ip_local_ports.range[1] = range[1];
  58         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  59 }
  60
  61 /* Validate changes from /proc interface. */
  62 static int ipv4_local_port_range(struct ctl_table *table, int write,
  63                                  void *buffer, size_t *lenp, loff_t *ppos)
  64 {
  65         struct net *net =
  66                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  67         int ret;
  68         int range[2];
  69         struct ctl_table tmp = {
  70                 .data = &range,
  71                 .maxlen = sizeof(range),
  72                 .mode = table->mode,
  73                 .extra1 = &ip_local_port_range_min,
  74                 .extra2 = &ip_local_port_range_max,
  75         };
  76
  77         inet_get_local_port_range(net, &range[0], &range[1]);
  78
  79         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  80
  81         if (write && ret == 0) {
  82                 /* Ensure that the upper limit is not smaller than the lower,
  83                  * and that the lower does not encroach upon the privileged
  84                  * port limit.
  85                  */
  86                 if ((range[1] < range[0]) ||
  87                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
  88                         ret = -EINVAL;
  89                 else
  90                         set_local_port_range(net, range);
  91         }
  92
  93         return ret;
  94 }
  95
  96 /* Validate changes from /proc interface. */
  97 static int ipv4_privileged_ports(struct ctl_table *table, int write,
  98                                 void *buffer, size_t *lenp, loff_t *ppos)
  99 {
 100         struct net *net = container_of(table->data, struct net,
 101             ipv4.sysctl_ip_prot_sock);
 102         int ret;
 103         int pports;
 104         int range[2];
 105         struct ctl_table tmp = {
 106                 .data = &pports,
 107                 .maxlen = sizeof(pports),
 108                 .mode = table->mode,
 109                 .extra1 = &ip_privileged_port_min,
 110                 .extra2 = &ip_privileged_port_max,
 111         };
 112
 113         pports = net->ipv4.sysctl_ip_prot_sock;
 114
 115         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 116
 117         if (write && ret == 0) {
 118                 inet_get_local_port_range(net, &range[0], &range[1]);
 119                 /* Ensure that the local port range doesn't overlap with the
 120                  * privileged port range.
 121                  */
 122                 if (range[0] < pports)
 123                         ret = -EINVAL;
 124                 else
 125                         net->ipv4.sysctl_ip_prot_sock = pports;
 126         }
 127
 128         return ret;
 129 }
 130
 131 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 132 {
 133         kgid_t *data = table->data;
 134         struct net *net =
 135                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 136         unsigned int seq;
 137         do {
 138                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 139
 140                 *low = data[0];
 141                 *high = data[1];
 142         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 143 }
 144
 145 /* Update system visible IP port range */
 146 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 147 {
 148         kgid_t *data = table->data;
 149         struct net *net =
 150                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 151         write_seqlock(&net->ipv4.ping_group_range.lock);
 152         data[0] = low;
 153         data[1] = high;
 154         write_sequnlock(&net->ipv4.ping_group_range.lock);
 155 }
 156
 157 /* Validate changes from /proc interface. */
 158 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 159                                  void *buffer, size_t *lenp, loff_t *ppos)
 160 {
 161         struct user_namespace *user_ns = current_user_ns();
 162         int ret;
 163         gid_t urange[2];
 164         kgid_t low, high;
 165         struct ctl_table tmp = {
 166                 .data = &urange,
 167                 .maxlen = sizeof(urange),
 168                 .mode = table->mode,
 169                 .extra1 = &ip_ping_group_range_min,
 170                 .extra2 = &ip_ping_group_range_max,
 171         };
 172
 173         inet_get_ping_group_range_table(table, &low, &high);
 174         urange[0] = from_kgid_munged(user_ns, low);
 175         urange[1] = from_kgid_munged(user_ns, high);
 176         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 177
 178         if (write && ret == 0) {
 179                 low = make_kgid(user_ns, urange[0]);
 180                 high = make_kgid(user_ns, urange[1]);
 181                 if (!gid_valid(low) || !gid_valid(high))
 182                         return -EINVAL;
 183                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 184                         low = make_kgid(&init_user_ns, 1);
 185                         high = make_kgid(&init_user_ns, 0);
 186                 }
 187                 set_ping_group_range(table, low, high);
 188         }
 189
 190         return ret;
 191 }
 192
 193 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 194                                     void *buffer, size_t *lenp, loff_t *ppos)
 195 {
 196         struct net *net;
 197         int ret;
 198
 199         net = container_of(table->data, struct net,
 200                            ipv4.sysctl_ip_fwd_update_priority);
 201         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 202         if (write && ret == 0)
 203                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 204                                         net);
 205
 206         return ret;
 207 }
 208
 209 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 210                                        void *buffer, size_t *lenp, loff_t *ppos)
 211 {
 212         struct net *net = container_of(ctl->data, struct net,
 213                                        ipv4.tcp_congestion_control);
 214         char val[TCP_CA_NAME_MAX];
 215         struct ctl_table tbl = {
 216                 .data = val,
 217                 .maxlen = TCP_CA_NAME_MAX,
 218         };
 219         int ret;
 220
 221         tcp_get_default_congestion_control(net, val);
 222
 223         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 224         if (write && ret == 0)
 225                 ret = tcp_set_default_congestion_control(net, val);
 226         return ret;
 227 }
 228
 229 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 230                                                  int write, void *buffer,
 231                                                  size_t *lenp, loff_t *ppos)
 232 {
 233         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 234         int ret;
 235
 236         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 237         if (!tbl.data)
 238                 return -ENOMEM;
 239         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 240         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 241         kfree(tbl.data);
 242         return ret;
 243 }
 244
 245 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 246                                            int write, void *buffer,
 247                                            size_t *lenp, loff_t *ppos)
 248 {
 249         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 250         int ret;
 251
 252         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 253         if (!tbl.data)
 254                 return -ENOMEM;
 255
 256         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 257         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 258         if (write && ret == 0)
 259                 ret = tcp_set_allowed_congestion_control(tbl.data);
 260         kfree(tbl.data);
 261         return ret;
 262 }
 263
 264 static int sscanf_key(char *buf, __le32 *key)
 265 {
 266         u32 user_key[4];
 267         int i, ret = 0;
 268
 269         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 270                    user_key + 2, user_key + 3) != 4) {
 271                 ret = -EINVAL;
 272         } else {
 273                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 274                         key[i] = cpu_to_le32(user_key[i]);
 275         }
 276         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 277                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 278
 279         return ret;
 280 }
 281
 282 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 283                                  void *buffer, size_t *lenp, loff_t *ppos)
 284 {
 285         struct net *net = container_of(table->data, struct net,
 286             ipv4.sysctl_tcp_fastopen);
 287         /* maxlen to print the list of keys in hex (*2), with dashes
 288          * separating doublewords and a comma in between keys.
 289          */
 290         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 291                                             2 * TCP_FASTOPEN_KEY_MAX) +
 292                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 293         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 294         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 295         char *backup_data;
 296         int ret, i = 0, off = 0, n_keys;
 297
 298         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 299         if (!tbl.data)
 300                 return -ENOMEM;
 301
 302         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 303         if (!n_keys) {
 304                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 305                 n_keys = 1;
 306         }
 307
 308         for (i = 0; i < n_keys * 4; i++)
 309                 user_key[i] = le32_to_cpu(key[i]);
 310
 311         for (i = 0; i < n_keys; i++) {
 312                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 313                                 "%08x-%08x-%08x-%08x",
 314                                 user_key[i * 4],
 315                                 user_key[i * 4 + 1],
 316                                 user_key[i * 4 + 2],
 317                                 user_key[i * 4 + 3]);
 318
 319                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 320                         break;
 321
 322                 if (i + 1 < n_keys)
 323                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 324         }
 325
 326         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 327
 328         if (write && ret == 0) {
 329                 backup_data = strchr(tbl.data, ',');
 330                 if (backup_data) {
 331                         *backup_data = '\0';
 332                         backup_data++;
 333                 }
 334                 if (sscanf_key(tbl.data, key)) {
 335                         ret = -EINVAL;
 336                         goto bad_key;
 337                 }
 338                 if (backup_data) {
 339                         if (sscanf_key(backup_data, key + 4)) {
 340                                 ret = -EINVAL;
 341                                 goto bad_key;
 342                         }
 343                 }
 344                 tcp_fastopen_reset_cipher(net, NULL, key,
 345                                           backup_data ? key + 4 : NULL);
 346         }
 347
 348 bad_key:
 349         kfree(tbl.data);
 350         return ret;
 351 }
 352
 353 static void proc_configure_early_demux(int enabled, int protocol)
 354 {
 355         struct net_protocol *ipprot;
 356 #if IS_ENABLED(CONFIG_IPV6)
 357         struct inet6_protocol *ip6prot;
 358 #endif
 359
 360         rcu_read_lock();
 361
 362         ipprot = rcu_dereference(inet_protos[protocol]);
 363         if (ipprot)
 364                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 365                                                 NULL;
 366
 367 #if IS_ENABLED(CONFIG_IPV6)
 368         ip6prot = rcu_dereference(inet6_protos[protocol]);
 369         if (ip6prot)
 370                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 371                                                  NULL;
 372 #endif
 373         rcu_read_unlock();
 374 }
 375
 376 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 377                                 void *buffer, size_t *lenp, loff_t *ppos)
 378 {
 379         int ret = 0;
 380
 381         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 382
 383         if (write && !ret) {
 384                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 385
 386                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 387         }
 388
 389         return ret;
 390 }
 391
 392 static int proc_udp_early_demux(struct ctl_table *table, int write,
 393                                 void *buffer, size_t *lenp, loff_t *ppos)
 394 {
 395         int ret = 0;
 396
 397         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 398
 399         if (write && !ret) {
 400                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 401
 402                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 403         }
 404
 405         return ret;
 406 }
 407
 408 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 409                                              int write, void *buffer,
 410                                              size_t *lenp, loff_t *ppos)
 411 {
 412         struct net *net = container_of(table->data, struct net,
 413             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 414         int ret;
 415
 416         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 417         if (write && ret == 0)
 418                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 419
 420         return ret;
 421 }
 422
 423 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 424                                   int write, void *buffer, size_t *lenp,
 425                                   loff_t *ppos)
 426 {
 427         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 428         int ret;
 429
 430         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 431         if (!tbl.data)
 432                 return -ENOMEM;
 433         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 434         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 435         kfree(tbl.data);
 436
 437         return ret;
 438 }
 439
 440 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 441 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 442                                           void *buffer, size_t *lenp,
 443                                           loff_t *ppos)
 444 {
 445         struct net *net = container_of(table->data, struct net,
 446             ipv4.sysctl_fib_multipath_hash_policy);
 447         int ret;
 448
 449         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 450         if (write && ret == 0)
 451                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 452
 453         return ret;
 454 }
 455
 456 static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write,
 457                                           void *buffer, size_t *lenp,
 458                                           loff_t *ppos)
 459 {
 460         struct net *net;
 461         int ret;
 462
 463         net = container_of(table->data, struct net,
 464                            ipv4.sysctl_fib_multipath_hash_fields);
 465         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
 466         if (write && ret == 0)
 467                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 468
 469         return ret;
 470 }
 471 #endif
 472
 473 static struct ctl_table ipv4_table[] = {
 474         {
 475                 .procname       = "tcp_max_orphans",
 476                 .data           = &sysctl_tcp_max_orphans,
 477                 .maxlen         = sizeof(int),
 478                 .mode           = 0644,
 479                 .proc_handler   = proc_dointvec
 480         },
 481         {
 482                 .procname       = "inet_peer_threshold",
 483                 .data           = &inet_peer_threshold,
 484                 .maxlen         = sizeof(int),
 485                 .mode           = 0644,
 486                 .proc_handler   = proc_dointvec
 487         },
 488         {
 489                 .procname       = "inet_peer_minttl",
 490                 .data           = &inet_peer_minttl,
 491                 .maxlen         = sizeof(int),
 492                 .mode           = 0644,
 493                 .proc_handler   = proc_dointvec_jiffies,
 494         },
 495         {
 496                 .procname       = "inet_peer_maxttl",
 497                 .data           = &inet_peer_maxttl,
 498                 .maxlen         = sizeof(int),
 499                 .mode           = 0644,
 500                 .proc_handler   = proc_dointvec_jiffies,
 501         },
 502         {
 503                 .procname       = "tcp_mem",
 504                 .maxlen         = sizeof(sysctl_tcp_mem),
 505                 .data           = &sysctl_tcp_mem,
 506                 .mode           = 0644,
 507                 .proc_handler   = proc_doulongvec_minmax,
 508         },
 509         {
 510                 .procname       = "tcp_low_latency",
 511                 .data           = &sysctl_tcp_low_latency,
 512                 .maxlen         = sizeof(int),
 513                 .mode           = 0644,
 514                 .proc_handler   = proc_dointvec
 515         },
 516 #ifdef CONFIG_NETLABEL
 517         {
 518                 .procname       = "cipso_cache_enable",
 519                 .data           = &cipso_v4_cache_enabled,
 520                 .maxlen         = sizeof(int),
 521                 .mode           = 0644,
 522                 .proc_handler   = proc_dointvec,
 523         },
 524         {
 525                 .procname       = "cipso_cache_bucket_size",
 526                 .data           = &cipso_v4_cache_bucketsize,
 527                 .maxlen         = sizeof(int),
 528                 .mode           = 0644,
 529                 .proc_handler   = proc_dointvec,
 530         },
 531         {
 532                 .procname       = "cipso_rbm_optfmt",
 533                 .data           = &cipso_v4_rbm_optfmt,
 534                 .maxlen         = sizeof(int),
 535                 .mode           = 0644,
 536                 .proc_handler   = proc_dointvec,
 537         },
 538         {
 539                 .procname       = "cipso_rbm_strictvalid",
 540                 .data           = &cipso_v4_rbm_strictvalid,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_dointvec,
 544         },
 545 #endif /* CONFIG_NETLABEL */
 546         {
 547                 .procname       = "tcp_available_ulp",
 548                 .maxlen         = TCP_ULP_BUF_MAX,
 549                 .mode           = 0444,
 550                 .proc_handler   = proc_tcp_available_ulp,
 551         },
 552         {
 553                 .procname       = "icmp_msgs_per_sec",
 554                 .data           = &sysctl_icmp_msgs_per_sec,
 555                 .maxlen         = sizeof(int),
 556                 .mode           = 0644,
 557                 .proc_handler   = proc_dointvec_minmax,
 558                 .extra1         = SYSCTL_ZERO,
 559         },
 560         {
 561                 .procname       = "icmp_msgs_burst",
 562                 .data           = &sysctl_icmp_msgs_burst,
 563                 .maxlen         = sizeof(int),
 564                 .mode           = 0644,
 565                 .proc_handler   = proc_dointvec_minmax,
 566                 .extra1         = SYSCTL_ZERO,
 567         },
 568         {
 569                 .procname       = "udp_mem",
 570                 .data           = &sysctl_udp_mem,
 571                 .maxlen         = sizeof(sysctl_udp_mem),
 572                 .mode           = 0644,
 573                 .proc_handler   = proc_doulongvec_minmax,
 574         },
 575         {
 576                 .procname       = "fib_sync_mem",
 577                 .data           = &sysctl_fib_sync_mem,
 578                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 579                 .mode           = 0644,
 580                 .proc_handler   = proc_douintvec_minmax,
 581                 .extra1         = &sysctl_fib_sync_mem_min,
 582                 .extra2         = &sysctl_fib_sync_mem_max,
 583         },
 584         { }
 585 };
 586
 587 static struct ctl_table ipv4_net_table[] = {
 588         /* tcp_max_tw_buckets must be first in this table. */
 589         {
 590                 .procname       = "tcp_max_tw_buckets",
 591 /*              .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets, */
 592                 .maxlen         = sizeof(int),
 593                 .mode           = 0644,
 594                 .proc_handler   = proc_dointvec
 595         },
 596         {
 597                 .procname       = "icmp_echo_ignore_all",
 598                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 599                 .maxlen         = sizeof(u8),
 600                 .mode           = 0644,
 601                 .proc_handler   = proc_dou8vec_minmax,
 602                 .extra1         = SYSCTL_ZERO,
 603                 .extra2         = SYSCTL_ONE
 604         },
 605         {
 606                 .procname       = "icmp_echo_enable_probe",
 607                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 608                 .maxlen         = sizeof(u8),
 609                 .mode           = 0644,
 610                 .proc_handler   = proc_dou8vec_minmax,
 611                 .extra1         = SYSCTL_ZERO,
 612                 .extra2         = SYSCTL_ONE
 613         },
 614         {
 615                 .procname       = "icmp_echo_ignore_broadcasts",
 616                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 617                 .maxlen         = sizeof(u8),
 618                 .mode           = 0644,
 619                 .proc_handler   = proc_dou8vec_minmax,
 620                 .extra1         = SYSCTL_ZERO,
 621                 .extra2         = SYSCTL_ONE
 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                 .extra1         = SYSCTL_ZERO,
 630                 .extra2         = SYSCTL_ONE
 631         },
 632         {
 633                 .procname       = "icmp_errors_use_inbound_ifaddr",
 634                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 635                 .maxlen         = sizeof(u8),
 636                 .mode           = 0644,
 637                 .proc_handler   = proc_dou8vec_minmax,
 638                 .extra1         = SYSCTL_ZERO,
 639                 .extra2         = SYSCTL_ONE
 640         },
 641         {
 642                 .procname       = "icmp_ratelimit",
 643                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 644                 .maxlen         = sizeof(int),
 645                 .mode           = 0644,
 646                 .proc_handler   = proc_dointvec_ms_jiffies,
 647         },
 648         {
 649                 .procname       = "icmp_ratemask",
 650                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 651                 .maxlen         = sizeof(int),
 652                 .mode           = 0644,
 653                 .proc_handler   = proc_dointvec
 654         },
 655         {
 656                 .procname       = "ping_group_range",
 657                 .data           = &init_net.ipv4.ping_group_range.range,
 658                 .maxlen         = sizeof(gid_t)*2,
 659                 .mode           = 0644,
 660                 .proc_handler   = ipv4_ping_group_range,
 661         },
 662 #ifdef CONFIG_NET_L3_MASTER_DEV
 663         {
 664                 .procname       = "raw_l3mdev_accept",
 665                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 666                 .maxlen         = sizeof(u8),
 667                 .mode           = 0644,
 668                 .proc_handler   = proc_dou8vec_minmax,
 669                 .extra1         = SYSCTL_ZERO,
 670                 .extra2         = SYSCTL_ONE,
 671         },
 672 #endif
 673         {
 674                 .procname       = "tcp_ecn",
 675                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 676                 .maxlen         = sizeof(u8),
 677                 .mode           = 0644,
 678                 .proc_handler   = proc_dou8vec_minmax,
 679                 .extra1         = SYSCTL_ZERO,
 680                 .extra2         = SYSCTL_TWO,
 681         },
 682         {
 683                 .procname       = "tcp_ecn_fallback",
 684                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 685                 .maxlen         = sizeof(u8),
 686                 .mode           = 0644,
 687                 .proc_handler   = proc_dou8vec_minmax,
 688                 .extra1         = SYSCTL_ZERO,
 689                 .extra2         = SYSCTL_ONE,
 690         },
 691         {
 692                 .procname       = "ip_dynaddr",
 693                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 694                 .maxlen         = sizeof(u8),
 695                 .mode           = 0644,
 696                 .proc_handler   = proc_dou8vec_minmax,
 697         },
 698         {
 699                 .procname       = "ip_early_demux",
 700                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 701                 .maxlen         = sizeof(u8),
 702                 .mode           = 0644,
 703                 .proc_handler   = proc_dou8vec_minmax,
 704         },
 705         {
 706                 .procname       = "udp_early_demux",
 707                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 708                 .maxlen         = sizeof(u8),
 709                 .mode           = 0644,
 710                 .proc_handler   = proc_udp_early_demux
 711         },
 712         {
 713                 .procname       = "tcp_early_demux",
 714                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 715                 .maxlen         = sizeof(u8),
 716                 .mode           = 0644,
 717                 .proc_handler   = proc_tcp_early_demux
 718         },
 719         {
 720                 .procname       = "nexthop_compat_mode",
 721                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 722                 .maxlen         = sizeof(u8),
 723                 .mode           = 0644,
 724                 .proc_handler   = proc_dou8vec_minmax,
 725                 .extra1         = SYSCTL_ZERO,
 726                 .extra2         = SYSCTL_ONE,
 727         },
 728         {
 729                 .procname       = "ip_default_ttl",
 730                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 731                 .maxlen         = sizeof(u8),
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_dou8vec_minmax,
 734                 .extra1         = &ip_ttl_min,
 735                 .extra2         = &ip_ttl_max,
 736         },
 737         {
 738                 .procname       = "ip_local_port_range",
 739                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 740                 .data           = &init_net.ipv4.ip_local_ports.range,
 741                 .mode           = 0644,
 742                 .proc_handler   = ipv4_local_port_range,
 743         },
 744         {
 745                 .procname       = "ip_local_reserved_ports",
 746                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 747                 .maxlen         = 65536,
 748                 .mode           = 0644,
 749                 .proc_handler   = proc_do_large_bitmap,
 750         },
 751         {
 752                 .procname       = "ip_no_pmtu_disc",
 753                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 754                 .maxlen         = sizeof(u8),
 755                 .mode           = 0644,
 756                 .proc_handler   = proc_dou8vec_minmax,
 757         },
 758         {
 759                 .procname       = "ip_forward_use_pmtu",
 760                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 761                 .maxlen         = sizeof(u8),
 762                 .mode           = 0644,
 763                 .proc_handler   = proc_dou8vec_minmax,
 764         },
 765         {
 766                 .procname       = "ip_forward_update_priority",
 767                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 768                 .maxlen         = sizeof(u8),
 769                 .mode           = 0644,
 770                 .proc_handler   = ipv4_fwd_update_priority,
 771                 .extra1         = SYSCTL_ZERO,
 772                 .extra2         = SYSCTL_ONE,
 773         },
 774         {
 775                 .procname       = "ip_nonlocal_bind",
 776                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 777                 .maxlen         = sizeof(u8),
 778                 .mode           = 0644,
 779                 .proc_handler   = proc_dou8vec_minmax,
 780         },
 781         {
 782                 .procname       = "ip_autobind_reuse",
 783                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 784                 .maxlen         = sizeof(u8),
 785                 .mode           = 0644,
 786                 .proc_handler   = proc_dou8vec_minmax,
 787                 .extra1         = SYSCTL_ZERO,
 788                 .extra2         = SYSCTL_ONE,
 789         },
 790         {
 791                 .procname       = "fwmark_reflect",
 792                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 793                 .maxlen         = sizeof(u8),
 794                 .mode           = 0644,
 795                 .proc_handler   = proc_dou8vec_minmax,
 796         },
 797         {
 798                 .procname       = "tcp_fwmark_accept",
 799                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 800                 .maxlen         = sizeof(u8),
 801                 .mode           = 0644,
 802                 .proc_handler   = proc_dou8vec_minmax,
 803         },
 804 #ifdef CONFIG_NET_L3_MASTER_DEV
 805         {
 806                 .procname       = "tcp_l3mdev_accept",
 807                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 808                 .maxlen         = sizeof(u8),
 809                 .mode           = 0644,
 810                 .proc_handler   = proc_dou8vec_minmax,
 811                 .extra1         = SYSCTL_ZERO,
 812                 .extra2         = SYSCTL_ONE,
 813         },
 814 #endif
 815         {
 816                 .procname       = "tcp_mtu_probing",
 817                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 818                 .maxlen         = sizeof(u8),
 819                 .mode           = 0644,
 820                 .proc_handler   = proc_dou8vec_minmax,
 821         },
 822         {
 823                 .procname       = "tcp_base_mss",
 824                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 825                 .maxlen         = sizeof(int),
 826                 .mode           = 0644,
 827                 .proc_handler   = proc_dointvec,
 828         },
 829         {
 830                 .procname       = "tcp_min_snd_mss",
 831                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 832                 .maxlen         = sizeof(int),
 833                 .mode           = 0644,
 834                 .proc_handler   = proc_dointvec_minmax,
 835                 .extra1         = &tcp_min_snd_mss_min,
 836                 .extra2         = &tcp_min_snd_mss_max,
 837         },
 838         {
 839                 .procname       = "tcp_mtu_probe_floor",
 840                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 841                 .maxlen         = sizeof(int),
 842                 .mode           = 0644,
 843                 .proc_handler   = proc_dointvec_minmax,
 844                 .extra1         = &tcp_min_snd_mss_min,
 845                 .extra2         = &tcp_min_snd_mss_max,
 846         },
 847         {
 848                 .procname       = "tcp_probe_threshold",
 849                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 850                 .maxlen         = sizeof(int),
 851                 .mode           = 0644,
 852                 .proc_handler   = proc_dointvec,
 853         },
 854         {
 855                 .procname       = "tcp_probe_interval",
 856                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 857                 .maxlen         = sizeof(u32),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_douintvec_minmax,
 860                 .extra2         = &u32_max_div_HZ,
 861         },
 862         {
 863                 .procname       = "igmp_link_local_mcast_reports",
 864                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 865                 .maxlen         = sizeof(u8),
 866                 .mode           = 0644,
 867                 .proc_handler   = proc_dou8vec_minmax,
 868         },
 869         {
 870                 .procname       = "igmp_max_memberships",
 871                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 872                 .maxlen         = sizeof(int),
 873                 .mode           = 0644,
 874                 .proc_handler   = proc_dointvec
 875         },
 876         {
 877                 .procname       = "igmp_max_msf",
 878                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 879                 .maxlen         = sizeof(int),
 880                 .mode           = 0644,
 881                 .proc_handler   = proc_dointvec
 882         },
 883 #ifdef CONFIG_IP_MULTICAST
 884         {
 885                 .procname       = "igmp_qrv",
 886                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 887                 .maxlen         = sizeof(int),
 888                 .mode           = 0644,
 889                 .proc_handler   = proc_dointvec_minmax,
 890                 .extra1         = SYSCTL_ONE
 891         },
 892 #endif
 893         {
 894                 .procname       = "tcp_congestion_control",
 895                 .data           = &init_net.ipv4.tcp_congestion_control,
 896                 .mode           = 0644,
 897                 .maxlen         = TCP_CA_NAME_MAX,
 898                 .proc_handler   = proc_tcp_congestion_control,
 899         },
 900         {
 901                 .procname       = "tcp_available_congestion_control",
 902                 .maxlen         = TCP_CA_BUF_MAX,
 903                 .mode           = 0444,
 904                 .proc_handler   = proc_tcp_available_congestion_control,
 905         },
 906         {
 907                 .procname       = "tcp_allowed_congestion_control",
 908                 .maxlen         = TCP_CA_BUF_MAX,
 909                 .mode           = 0644,
 910                 .proc_handler   = proc_allowed_congestion_control,
 911         },
 912         {
 913                 .procname       = "tcp_keepalive_time",
 914                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 915                 .maxlen         = sizeof(int),
 916                 .mode           = 0644,
 917                 .proc_handler   = proc_dointvec_jiffies,
 918         },
 919         {
 920                 .procname       = "tcp_keepalive_probes",
 921                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 922                 .maxlen         = sizeof(u8),
 923                 .mode           = 0644,
 924                 .proc_handler   = proc_dou8vec_minmax,
 925         },
 926         {
 927                 .procname       = "tcp_keepalive_intvl",
 928                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 929                 .maxlen         = sizeof(int),
 930                 .mode           = 0644,
 931                 .proc_handler   = proc_dointvec_jiffies,
 932         },
 933         {
 934                 .procname       = "tcp_syn_retries",
 935                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 936                 .maxlen         = sizeof(u8),
 937                 .mode           = 0644,
 938                 .proc_handler   = proc_dou8vec_minmax,
 939                 .extra1         = &tcp_syn_retries_min,
 940                 .extra2         = &tcp_syn_retries_max
 941         },
 942         {
 943                 .procname       = "tcp_synack_retries",
 944                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 945                 .maxlen         = sizeof(u8),
 946                 .mode           = 0644,
 947                 .proc_handler   = proc_dou8vec_minmax,
 948         },
 949 #ifdef CONFIG_SYN_COOKIES
 950         {
 951                 .procname       = "tcp_syncookies",
 952                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 953                 .maxlen         = sizeof(u8),
 954                 .mode           = 0644,
 955                 .proc_handler   = proc_dou8vec_minmax,
 956         },
 957 #endif
 958         {
 959                 .procname       = "tcp_migrate_req",
 960                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 961                 .maxlen         = sizeof(u8),
 962                 .mode           = 0644,
 963                 .proc_handler   = proc_dou8vec_minmax,
 964                 .extra1         = SYSCTL_ZERO,
 965                 .extra2         = SYSCTL_ONE
 966         },
 967         {
 968                 .procname       = "tcp_reordering",
 969                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 970                 .maxlen         = sizeof(int),
 971                 .mode           = 0644,
 972                 .proc_handler   = proc_dointvec
 973         },
 974         {
 975                 .procname       = "tcp_retries1",
 976                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 977                 .maxlen         = sizeof(u8),
 978                 .mode           = 0644,
 979                 .proc_handler   = proc_dou8vec_minmax,
 980                 .extra2         = &tcp_retr1_max
 981         },
 982         {
 983                 .procname       = "tcp_retries2",
 984                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 985                 .maxlen         = sizeof(u8),
 986                 .mode           = 0644,
 987                 .proc_handler   = proc_dou8vec_minmax,
 988         },
 989         {
 990                 .procname       = "tcp_orphan_retries",
 991                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 992                 .maxlen         = sizeof(u8),
 993                 .mode           = 0644,
 994                 .proc_handler   = proc_dou8vec_minmax,
 995         },
 996         {
 997                 .procname       = "tcp_fin_timeout",
 998                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 999                 .maxlen         = sizeof(int),
1000                 .mode           = 0644,
1001                 .proc_handler   = proc_dointvec_jiffies,
1002         },
1003         {
1004                 .procname       = "tcp_notsent_lowat",
1005                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1006                 .maxlen         = sizeof(unsigned int),
1007                 .mode           = 0644,
1008                 .proc_handler   = proc_douintvec,
1009         },
1010         {
1011                 .procname       = "tcp_tw_reuse",
1012                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
1013                 .maxlen         = sizeof(u8),
1014                 .mode           = 0644,
1015                 .proc_handler   = proc_dou8vec_minmax,
1016                 .extra1         = SYSCTL_ZERO,
1017                 .extra2         = SYSCTL_TWO,
1018         },
1019         {
1020                 .procname       = "tcp_max_syn_backlog",
1021                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1022                 .maxlen         = sizeof(int),
1023                 .mode           = 0644,
1024                 .proc_handler   = proc_dointvec
1025         },
1026         {
1027                 .procname       = "tcp_fastopen",
1028                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1029                 .maxlen         = sizeof(int),
1030                 .mode           = 0644,
1031                 .proc_handler   = proc_dointvec,
1032         },
1033         {
1034                 .procname       = "tcp_fastopen_key",
1035                 .mode           = 0600,
1036                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1037                 /* maxlen to print the list of keys in hex (*2), with dashes
1038                  * separating doublewords and a comma in between keys.
1039                  */
1040                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1041                                    2 * TCP_FASTOPEN_KEY_MAX) +
1042                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1043                 .proc_handler   = proc_tcp_fastopen_key,
1044         },
1045         {
1046                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1047                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1048                 .maxlen         = sizeof(int),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1051                 .extra1         = SYSCTL_ZERO,
1052         },
1053 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1054         {
1055                 .procname       = "fib_multipath_use_neigh",
1056                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1057                 .maxlen         = sizeof(u8),
1058                 .mode           = 0644,
1059                 .proc_handler   = proc_dou8vec_minmax,
1060                 .extra1         = SYSCTL_ZERO,
1061                 .extra2         = SYSCTL_ONE,
1062         },
1063         {
1064                 .procname       = "fib_multipath_hash_policy",
1065                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1066                 .maxlen         = sizeof(u8),
1067                 .mode           = 0644,
1068                 .proc_handler   = proc_fib_multipath_hash_policy,
1069                 .extra1         = SYSCTL_ZERO,
1070                 .extra2         = SYSCTL_THREE,
1071         },
1072         {
1073                 .procname       = "fib_multipath_hash_fields",
1074                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1075                 .maxlen         = sizeof(u32),
1076                 .mode           = 0644,
1077                 .proc_handler   = proc_fib_multipath_hash_fields,
1078                 .extra1         = SYSCTL_ONE,
1079                 .extra2         = &fib_multipath_hash_fields_all_mask,
1080         },
1081 #endif
1082         {
1083                 .procname       = "ip_unprivileged_port_start",
1084                 .maxlen         = sizeof(int),
1085                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1086                 .mode           = 0644,
1087                 .proc_handler   = ipv4_privileged_ports,
1088         },
1089 #ifdef CONFIG_NET_L3_MASTER_DEV
1090         {
1091                 .procname       = "udp_l3mdev_accept",
1092                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1093                 .maxlen         = sizeof(u8),
1094                 .mode           = 0644,
1095                 .proc_handler   = proc_dou8vec_minmax,
1096                 .extra1         = SYSCTL_ZERO,
1097                 .extra2         = SYSCTL_ONE,
1098         },
1099 #endif
1100         {
1101                 .procname       = "tcp_sack",
1102                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1103                 .maxlen         = sizeof(u8),
1104                 .mode           = 0644,
1105                 .proc_handler   = proc_dou8vec_minmax,
1106         },
1107         {
1108                 .procname       = "tcp_window_scaling",
1109                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1110                 .maxlen         = sizeof(u8),
1111                 .mode           = 0644,
1112                 .proc_handler   = proc_dou8vec_minmax,
1113         },
1114         {
1115                 .procname       = "tcp_timestamps",
1116                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1117                 .maxlen         = sizeof(u8),
1118                 .mode           = 0644,
1119                 .proc_handler   = proc_dou8vec_minmax,
1120         },
1121         {
1122                 .procname       = "tcp_early_retrans",
1123                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1124                 .maxlen         = sizeof(u8),
1125                 .mode           = 0644,
1126                 .proc_handler   = proc_dou8vec_minmax,
1127                 .extra1         = SYSCTL_ZERO,
1128                 .extra2         = SYSCTL_FOUR,
1129         },
1130         {
1131                 .procname       = "tcp_recovery",
1132                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1133                 .maxlen         = sizeof(u8),
1134                 .mode           = 0644,
1135                 .proc_handler   = proc_dou8vec_minmax,
1136         },
1137         {
1138                 .procname       = "tcp_thin_linear_timeouts",
1139                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1140                 .maxlen         = sizeof(u8),
1141                 .mode           = 0644,
1142                 .proc_handler   = proc_dou8vec_minmax,
1143         },
1144         {
1145                 .procname       = "tcp_slow_start_after_idle",
1146                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1147                 .maxlen         = sizeof(u8),
1148                 .mode           = 0644,
1149                 .proc_handler   = proc_dou8vec_minmax,
1150         },
1151         {
1152                 .procname       = "tcp_retrans_collapse",
1153                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1154                 .maxlen         = sizeof(u8),
1155                 .mode           = 0644,
1156                 .proc_handler   = proc_dou8vec_minmax,
1157         },
1158         {
1159                 .procname       = "tcp_stdurg",
1160                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1161                 .maxlen         = sizeof(u8),
1162                 .mode           = 0644,
1163                 .proc_handler   = proc_dou8vec_minmax,
1164         },
1165         {
1166                 .procname       = "tcp_rfc1337",
1167                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1168                 .maxlen         = sizeof(u8),
1169                 .mode           = 0644,
1170                 .proc_handler   = proc_dou8vec_minmax,
1171         },
1172         {
1173                 .procname       = "tcp_abort_on_overflow",
1174                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1175                 .maxlen         = sizeof(u8),
1176                 .mode           = 0644,
1177                 .proc_handler   = proc_dou8vec_minmax,
1178         },
1179         {
1180                 .procname       = "tcp_fack",
1181                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1182                 .maxlen         = sizeof(u8),
1183                 .mode           = 0644,
1184                 .proc_handler   = proc_dou8vec_minmax,
1185         },
1186         {
1187                 .procname       = "tcp_max_reordering",
1188                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1189                 .maxlen         = sizeof(int),
1190                 .mode           = 0644,
1191                 .proc_handler   = proc_dointvec
1192         },
1193         {
1194                 .procname       = "tcp_dsack",
1195                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1196                 .maxlen         = sizeof(u8),
1197                 .mode           = 0644,
1198                 .proc_handler   = proc_dou8vec_minmax,
1199         },
1200         {
1201                 .procname       = "tcp_app_win",
1202                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1203                 .maxlen         = sizeof(u8),
1204                 .mode           = 0644,
1205                 .proc_handler   = proc_dou8vec_minmax,
1206         },
1207         {
1208                 .procname       = "tcp_adv_win_scale",
1209                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1210                 .maxlen         = sizeof(int),
1211                 .mode           = 0644,
1212                 .proc_handler   = proc_dointvec_minmax,
1213                 .extra1         = &tcp_adv_win_scale_min,
1214                 .extra2         = &tcp_adv_win_scale_max,
1215         },
1216         {
1217                 .procname       = "tcp_frto",
1218                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1219                 .maxlen         = sizeof(u8),
1220                 .mode           = 0644,
1221                 .proc_handler   = proc_dou8vec_minmax,
1222         },
1223         {
1224                 .procname       = "tcp_no_metrics_save",
1225                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1226                 .maxlen         = sizeof(u8),
1227                 .mode           = 0644,
1228                 .proc_handler   = proc_dou8vec_minmax,
1229         },
1230         {
1231                 .procname       = "tcp_no_ssthresh_metrics_save",
1232                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1233                 .maxlen         = sizeof(u8),
1234                 .mode           = 0644,
1235                 .proc_handler   = proc_dou8vec_minmax,
1236                 .extra1         = SYSCTL_ZERO,
1237                 .extra2         = SYSCTL_ONE,
1238         },
1239         {
1240                 .procname       = "tcp_moderate_rcvbuf",
1241                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1242                 .maxlen         = sizeof(u8),
1243                 .mode           = 0644,
1244                 .proc_handler   = proc_dou8vec_minmax,
1245         },
1246         {
1247                 .procname       = "tcp_tso_win_divisor",
1248                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1249                 .maxlen         = sizeof(u8),
1250                 .mode           = 0644,
1251                 .proc_handler   = proc_dou8vec_minmax,
1252         },
1253         {
1254                 .procname       = "tcp_workaround_signed_windows",
1255                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1256                 .maxlen         = sizeof(u8),
1257                 .mode           = 0644,
1258                 .proc_handler   = proc_dou8vec_minmax,
1259         },
1260         {
1261                 .procname       = "tcp_limit_output_bytes",
1262                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1263                 .maxlen         = sizeof(int),
1264                 .mode           = 0644,
1265                 .proc_handler   = proc_dointvec
1266         },
1267         {
1268                 .procname       = "tcp_challenge_ack_limit",
1269                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1270                 .maxlen         = sizeof(int),
1271                 .mode           = 0644,
1272                 .proc_handler   = proc_dointvec
1273         },
1274         {
1275                 .procname       = "tcp_min_tso_segs",
1276                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1277                 .maxlen         = sizeof(u8),
1278                 .mode           = 0644,
1279                 .proc_handler   = proc_dou8vec_minmax,
1280                 .extra1         = SYSCTL_ONE,
1281         },
1282         {
1283                 .procname       = "tcp_tso_rtt_log",
1284                 .data           = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1285                 .maxlen         = sizeof(u8),
1286                 .mode           = 0644,
1287                 .proc_handler   = proc_dou8vec_minmax,
1288         },
1289         {
1290                 .procname       = "tcp_min_rtt_wlen",
1291                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1292                 .maxlen         = sizeof(int),
1293                 .mode           = 0644,
1294                 .proc_handler   = proc_dointvec_minmax,
1295                 .extra1         = SYSCTL_ZERO,
1296                 .extra2         = &one_day_secs
1297         },
1298         {
1299                 .procname       = "tcp_autocorking",
1300                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1301                 .maxlen         = sizeof(u8),
1302                 .mode           = 0644,
1303                 .proc_handler   = proc_dou8vec_minmax,
1304                 .extra1         = SYSCTL_ZERO,
1305                 .extra2         = SYSCTL_ONE,
1306         },
1307         {
1308                 .procname       = "tcp_invalid_ratelimit",
1309                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1310                 .maxlen         = sizeof(int),
1311                 .mode           = 0644,
1312                 .proc_handler   = proc_dointvec_ms_jiffies,
1313         },
1314         {
1315                 .procname       = "tcp_pacing_ss_ratio",
1316                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1317                 .maxlen         = sizeof(int),
1318                 .mode           = 0644,
1319                 .proc_handler   = proc_dointvec_minmax,
1320                 .extra1         = SYSCTL_ZERO,
1321                 .extra2         = SYSCTL_ONE_THOUSAND,
1322         },
1323         {
1324                 .procname       = "tcp_pacing_ca_ratio",
1325                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1326                 .maxlen         = sizeof(int),
1327                 .mode           = 0644,
1328                 .proc_handler   = proc_dointvec_minmax,
1329                 .extra1         = SYSCTL_ZERO,
1330                 .extra2         = SYSCTL_ONE_THOUSAND,
1331         },
1332         {
1333                 .procname       = "tcp_wmem",
1334                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1335                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1336                 .mode           = 0644,
1337                 .proc_handler   = proc_dointvec_minmax,
1338                 .extra1         = SYSCTL_ONE,
1339         },
1340         {
1341                 .procname       = "tcp_rmem",
1342                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1343                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1344                 .mode           = 0644,
1345                 .proc_handler   = proc_dointvec_minmax,
1346                 .extra1         = SYSCTL_ONE,
1347         },
1348         {
1349                 .procname       = "tcp_comp_sack_delay_ns",
1350                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1351                 .maxlen         = sizeof(unsigned long),
1352                 .mode           = 0644,
1353                 .proc_handler   = proc_doulongvec_minmax,
1354         },
1355         {
1356                 .procname       = "tcp_comp_sack_slack_ns",
1357                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1358                 .maxlen         = sizeof(unsigned long),
1359                 .mode           = 0644,
1360                 .proc_handler   = proc_doulongvec_minmax,
1361         },
1362         {
1363                 .procname       = "tcp_comp_sack_nr",
1364                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1365                 .maxlen         = sizeof(u8),
1366                 .mode           = 0644,
1367                 .proc_handler   = proc_dou8vec_minmax,
1368                 .extra1         = SYSCTL_ZERO,
1369         },
1370         {
1371                 .procname       = "tcp_reflect_tos",
1372                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1373                 .maxlen         = sizeof(u8),
1374                 .mode           = 0644,
1375                 .proc_handler   = proc_dou8vec_minmax,
1376                 .extra1         = SYSCTL_ZERO,
1377                 .extra2         = SYSCTL_ONE,
1378         },
1379         {
1380                 .procname       = "udp_rmem_min",
1381                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1382                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1383                 .mode           = 0644,
1384                 .proc_handler   = proc_dointvec_minmax,
1385                 .extra1         = SYSCTL_ONE
1386         },
1387         {
1388                 .procname       = "udp_wmem_min",
1389                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1390                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1391                 .mode           = 0644,
1392                 .proc_handler   = proc_dointvec_minmax,
1393                 .extra1         = SYSCTL_ONE
1394         },
1395         {
1396                 .procname       = "fib_notify_on_flag_change",
1397                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1398                 .maxlen         = sizeof(u8),
1399                 .mode           = 0644,
1400                 .proc_handler   = proc_dou8vec_minmax,
1401                 .extra1         = SYSCTL_ZERO,
1402                 .extra2         = SYSCTL_TWO,
1403         },
1404         { }
1405 };
1406
1407 static __net_init int ipv4_sysctl_init_net(struct net *net)
1408 {
1409         struct ctl_table *table;
1410
1411         table = ipv4_net_table;
1412         if (!net_eq(net, &init_net)) {
1413                 int i;
1414
1415                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1416                 if (!table)
1417                         goto err_alloc;
1418
1419                 /* skip first entry (sysctl_max_tw_buckets) */
1420                 for (i = 1; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1421                         if (table[i].data) {
1422                                 /* Update the variables to point into
1423                                  * the current struct net
1424                                  */
1425                                 table[i].data += (void *)net - (void *)&init_net;
1426                         } else {
1427                                 /* Entries without data pointer are global;
1428                                  * Make them read-only in non-init_net ns
1429                                  */
1430                                 table[i].mode &= ~0222;
1431                         }
1432                 }
1433         }
1434
1435         table[0].data = &net->ipv4.tcp_death_row->sysctl_max_tw_buckets;
1436
1437         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1438         if (!net->ipv4.ipv4_hdr)
1439                 goto err_reg;
1440
1441         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1442         if (!net->ipv4.sysctl_local_reserved_ports)
1443                 goto err_ports;
1444
1445         return 0;
1446
1447 err_ports:
1448         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1449 err_reg:
1450         if (!net_eq(net, &init_net))
1451                 kfree(table);
1452 err_alloc:
1453         return -ENOMEM;
1454 }
1455
1456 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1457 {
1458         struct ctl_table *table;
1459
1460         kfree(net->ipv4.sysctl_local_reserved_ports);
1461         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1462         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1463         kfree(table);
1464 }
1465
1466 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1467         .init = ipv4_sysctl_init_net,
1468         .exit = ipv4_sysctl_exit_net,
1469 };
1470
1471 static __init int sysctl_ipv4_init(void)
1472 {
1473         struct ctl_table_header *hdr;
1474
1475         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1476         if (!hdr)
1477                 return -ENOMEM;
1478
1479         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1480                 unregister_net_sysctl_table(hdr);
1481                 return -ENOMEM;
1482         }
1483
1484         return 0;
1485 }
1486
1487 __initcall(sysctl_ipv4_init);