net/ipv4/sysctl_net_ipv4.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   4  *
   5  * Begun April 1, 1996, Mike Shaver.
   6  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   7  */
   8
   9 #include <linux/mm.h>
  10 #include <linux/module.h>
  11 #include <linux/sysctl.h>
  12 #include <linux/igmp.h>
  13 #include <linux/inetdevice.h>
  14 #include <linux/seqlock.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/nsproxy.h>
  18 #include <linux/swap.h>
  19 #include <net/snmp.h>
  20 #include <net/icmp.h>
  21 #include <net/ip.h>
  22 #include <net/ip_fib.h>
  23 #include <net/route.h>
  24 #include <net/tcp.h>
  25 #include <net/udp.h>
  26 #include <net/cipso_ipv4.h>
  27 #include <net/inet_frag.h>
  28 #include <net/ping.h>
  29 #include <net/protocol.h>
  30 #include <net/netevent.h>
  31
  32 static int two = 2;
  33 static int three __maybe_unused = 3;
  34 static int four = 4;
  35 static int thousand = 1000;
  36 static int tcp_retr1_max = 255;
  37 static int ip_local_port_range_min[] = { 1, 1 };
  38 static int ip_local_port_range_max[] = { 65535, 65535 };
  39 static int tcp_adv_win_scale_min = -31;
  40 static int tcp_adv_win_scale_max = 31;
  41 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  42 static int tcp_min_snd_mss_max = 65535;
  43 static int ip_privileged_port_min;
  44 static int ip_privileged_port_max = 65535;
  45 static int ip_ttl_min = 1;
  46 static int ip_ttl_max = 255;
  47 static int tcp_syn_retries_min = 1;
  48 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  49 static int ip_ping_group_range_min[] = { 0, 0 };
  50 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  51 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  52 static int one_day_secs = 24 * 3600;
  53 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
  54         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
  55
  56 /* obsolete */
  57 static int sysctl_tcp_low_latency __read_mostly;
  58
  59 /* Update system visible IP port range */
  60 static void set_local_port_range(struct net *net, int range[2])
  61 {
  62         bool same_parity = !((range[0] ^ range[1]) & 1);
  63
  64         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  65         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  66                 net->ipv4.ip_local_ports.warned = true;
  67                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  68         }
  69         net->ipv4.ip_local_ports.range[0] = range[0];
  70         net->ipv4.ip_local_ports.range[1] = range[1];
  71         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  72 }
  73
  74 /* Validate changes from /proc interface. */
  75 static int ipv4_local_port_range(struct ctl_table *table, int write,
  76                                  void *buffer, size_t *lenp, loff_t *ppos)
  77 {
  78         struct net *net =
  79                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  80         int ret;
  81         int range[2];
  82         struct ctl_table tmp = {
  83                 .data = &range,
  84                 .maxlen = sizeof(range),
  85                 .mode = table->mode,
  86                 .extra1 = &ip_local_port_range_min,
  87                 .extra2 = &ip_local_port_range_max,
  88         };
  89
  90         inet_get_local_port_range(net, &range[0], &range[1]);
  91
  92         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  93
  94         if (write && ret == 0) {
  95                 /* Ensure that the upper limit is not smaller than the lower,
  96                  * and that the lower does not encroach upon the privileged
  97                  * port limit.
  98                  */
  99                 if ((range[1] < range[0]) ||
 100                     (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
 101                         ret = -EINVAL;
 102                 else
 103                         set_local_port_range(net, range);
 104         }
 105
 106         return ret;
 107 }
 108
 109 /* Validate changes from /proc interface. */
 110 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 111                                 void *buffer, size_t *lenp, loff_t *ppos)
 112 {
 113         struct net *net = container_of(table->data, struct net,
 114             ipv4.sysctl_ip_prot_sock);
 115         int ret;
 116         int pports;
 117         int range[2];
 118         struct ctl_table tmp = {
 119                 .data = &pports,
 120                 .maxlen = sizeof(pports),
 121                 .mode = table->mode,
 122                 .extra1 = &ip_privileged_port_min,
 123                 .extra2 = &ip_privileged_port_max,
 124         };
 125
 126         pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
 127
 128         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 129
 130         if (write && ret == 0) {
 131                 inet_get_local_port_range(net, &range[0], &range[1]);
 132                 /* Ensure that the local port range doesn't overlap with the
 133                  * privileged port range.
 134                  */
 135                 if (range[0] < pports)
 136                         ret = -EINVAL;
 137                 else
 138                         WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
 139         }
 140
 141         return ret;
 142 }
 143
 144 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 145 {
 146         kgid_t *data = table->data;
 147         struct net *net =
 148                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 149         unsigned int seq;
 150         do {
 151                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 152
 153                 *low = data[0];
 154                 *high = data[1];
 155         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 156 }
 157
 158 /* Update system visible IP port range */
 159 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 160 {
 161         kgid_t *data = table->data;
 162         struct net *net =
 163                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 164         write_seqlock(&net->ipv4.ping_group_range.lock);
 165         data[0] = low;
 166         data[1] = high;
 167         write_sequnlock(&net->ipv4.ping_group_range.lock);
 168 }
 169
 170 /* Validate changes from /proc interface. */
 171 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 172                                  void *buffer, size_t *lenp, loff_t *ppos)
 173 {
 174         struct user_namespace *user_ns = current_user_ns();
 175         int ret;
 176         gid_t urange[2];
 177         kgid_t low, high;
 178         struct ctl_table tmp = {
 179                 .data = &urange,
 180                 .maxlen = sizeof(urange),
 181                 .mode = table->mode,
 182                 .extra1 = &ip_ping_group_range_min,
 183                 .extra2 = &ip_ping_group_range_max,
 184         };
 185
 186         inet_get_ping_group_range_table(table, &low, &high);
 187         urange[0] = from_kgid_munged(user_ns, low);
 188         urange[1] = from_kgid_munged(user_ns, high);
 189         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 190
 191         if (write && ret == 0) {
 192                 low = make_kgid(user_ns, urange[0]);
 193                 high = make_kgid(user_ns, urange[1]);
 194                 if (!gid_valid(low) || !gid_valid(high))
 195                         return -EINVAL;
 196                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 197                         low = make_kgid(&init_user_ns, 1);
 198                         high = make_kgid(&init_user_ns, 0);
 199                 }
 200                 set_ping_group_range(table, low, high);
 201         }
 202
 203         return ret;
 204 }
 205
 206 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 207                                     void *buffer, size_t *lenp, loff_t *ppos)
 208 {
 209         struct net *net;
 210         int ret;
 211
 212         net = container_of(table->data, struct net,
 213                            ipv4.sysctl_ip_fwd_update_priority);
 214         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 215         if (write && ret == 0)
 216                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 217                                         net);
 218
 219         return ret;
 220 }
 221
 222 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 223                                        void *buffer, size_t *lenp, loff_t *ppos)
 224 {
 225         struct net *net = container_of(ctl->data, struct net,
 226                                        ipv4.tcp_congestion_control);
 227         char val[TCP_CA_NAME_MAX];
 228         struct ctl_table tbl = {
 229                 .data = val,
 230                 .maxlen = TCP_CA_NAME_MAX,
 231         };
 232         int ret;
 233
 234         tcp_get_default_congestion_control(net, val);
 235
 236         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 237         if (write && ret == 0)
 238                 ret = tcp_set_default_congestion_control(net, val);
 239         return ret;
 240 }
 241
 242 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 243                                                  int write, void *buffer,
 244                                                  size_t *lenp, loff_t *ppos)
 245 {
 246         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 247         int ret;
 248
 249         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 250         if (!tbl.data)
 251                 return -ENOMEM;
 252         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 253         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 254         kfree(tbl.data);
 255         return ret;
 256 }
 257
 258 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 259                                            int write, void *buffer,
 260                                            size_t *lenp, loff_t *ppos)
 261 {
 262         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 263         int ret;
 264
 265         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 266         if (!tbl.data)
 267                 return -ENOMEM;
 268
 269         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 270         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 271         if (write && ret == 0)
 272                 ret = tcp_set_allowed_congestion_control(tbl.data);
 273         kfree(tbl.data);
 274         return ret;
 275 }
 276
 277 static int sscanf_key(char *buf, __le32 *key)
 278 {
 279         u32 user_key[4];
 280         int i, ret = 0;
 281
 282         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 283                    user_key + 2, user_key + 3) != 4) {
 284                 ret = -EINVAL;
 285         } else {
 286                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 287                         key[i] = cpu_to_le32(user_key[i]);
 288         }
 289         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 290                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 291
 292         return ret;
 293 }
 294
 295 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 296                                  void *buffer, size_t *lenp, loff_t *ppos)
 297 {
 298         struct net *net = container_of(table->data, struct net,
 299             ipv4.sysctl_tcp_fastopen);
 300         /* maxlen to print the list of keys in hex (*2), with dashes
 301          * separating doublewords and a comma in between keys.
 302          */
 303         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 304                                             2 * TCP_FASTOPEN_KEY_MAX) +
 305                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 306         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 307         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 308         char *backup_data;
 309         int ret, i = 0, off = 0, n_keys;
 310
 311         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 312         if (!tbl.data)
 313                 return -ENOMEM;
 314
 315         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 316         if (!n_keys) {
 317                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 318                 n_keys = 1;
 319         }
 320
 321         for (i = 0; i < n_keys * 4; i++)
 322                 user_key[i] = le32_to_cpu(key[i]);
 323
 324         for (i = 0; i < n_keys; i++) {
 325                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 326                                 "%08x-%08x-%08x-%08x",
 327                                 user_key[i * 4],
 328                                 user_key[i * 4 + 1],
 329                                 user_key[i * 4 + 2],
 330                                 user_key[i * 4 + 3]);
 331
 332                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 333                         break;
 334
 335                 if (i + 1 < n_keys)
 336                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 337         }
 338
 339         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 340
 341         if (write && ret == 0) {
 342                 backup_data = strchr(tbl.data, ',');
 343                 if (backup_data) {
 344                         *backup_data = '\0';
 345                         backup_data++;
 346                 }
 347                 if (sscanf_key(tbl.data, key)) {
 348                         ret = -EINVAL;
 349                         goto bad_key;
 350                 }
 351                 if (backup_data) {
 352                         if (sscanf_key(backup_data, key + 4)) {
 353                                 ret = -EINVAL;
 354                                 goto bad_key;
 355                         }
 356                 }
 357                 tcp_fastopen_reset_cipher(net, NULL, key,
 358                                           backup_data ? key + 4 : NULL);
 359         }
 360
 361 bad_key:
 362         kfree(tbl.data);
 363         return ret;
 364 }
 365
 366 static void proc_configure_early_demux(int enabled, int protocol)
 367 {
 368         struct net_protocol *ipprot;
 369 #if IS_ENABLED(CONFIG_IPV6)
 370         struct inet6_protocol *ip6prot;
 371 #endif
 372
 373         rcu_read_lock();
 374
 375         ipprot = rcu_dereference(inet_protos[protocol]);
 376         if (ipprot)
 377                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 378                                                 NULL;
 379
 380 #if IS_ENABLED(CONFIG_IPV6)
 381         ip6prot = rcu_dereference(inet6_protos[protocol]);
 382         if (ip6prot)
 383                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 384                                                  NULL;
 385 #endif
 386         rcu_read_unlock();
 387 }
 388
 389 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 390                                 void *buffer, size_t *lenp, loff_t *ppos)
 391 {
 392         int ret = 0;
 393
 394         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 395
 396         if (write && !ret) {
 397                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 398
 399                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 400         }
 401
 402         return ret;
 403 }
 404
 405 static int proc_udp_early_demux(struct ctl_table *table, int write,
 406                                 void *buffer, size_t *lenp, loff_t *ppos)
 407 {
 408         int ret = 0;
 409
 410         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 411
 412         if (write && !ret) {
 413                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 414
 415                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 416         }
 417
 418         return ret;
 419 }
 420
 421 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 422                                              int write, void *buffer,
 423                                              size_t *lenp, loff_t *ppos)
 424 {
 425         struct net *net = container_of(table->data, struct net,
 426             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 427         int ret;
 428
 429         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 430         if (write && ret == 0)
 431                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 432
 433         return ret;
 434 }
 435
 436 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 437                                   int write, void *buffer, size_t *lenp,
 438                                   loff_t *ppos)
 439 {
 440         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 441         int ret;
 442
 443         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 444         if (!tbl.data)
 445                 return -ENOMEM;
 446         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 447         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 448         kfree(tbl.data);
 449
 450         return ret;
 451 }
 452
 453 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 454 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 455                                           void *buffer, size_t *lenp,
 456                                           loff_t *ppos)
 457 {
 458         struct net *net = container_of(table->data, struct net,
 459             ipv4.sysctl_fib_multipath_hash_policy);
 460         int ret;
 461
 462         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 463         if (write && ret == 0)
 464                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 465
 466         return ret;
 467 }
 468
 469 static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write,
 470                                           void *buffer, size_t *lenp,
 471                                           loff_t *ppos)
 472 {
 473         struct net *net;
 474         int ret;
 475
 476         net = container_of(table->data, struct net,
 477                            ipv4.sysctl_fib_multipath_hash_fields);
 478         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
 479         if (write && ret == 0)
 480                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 481
 482         return ret;
 483 }
 484 #endif
 485
 486 static struct ctl_table ipv4_table[] = {
 487         {
 488                 .procname       = "tcp_max_orphans",
 489                 .data           = &sysctl_tcp_max_orphans,
 490                 .maxlen         = sizeof(int),
 491                 .mode           = 0644,
 492                 .proc_handler   = proc_dointvec
 493         },
 494         {
 495                 .procname       = "inet_peer_threshold",
 496                 .data           = &inet_peer_threshold,
 497                 .maxlen         = sizeof(int),
 498                 .mode           = 0644,
 499                 .proc_handler   = proc_dointvec
 500         },
 501         {
 502                 .procname       = "inet_peer_minttl",
 503                 .data           = &inet_peer_minttl,
 504                 .maxlen         = sizeof(int),
 505                 .mode           = 0644,
 506                 .proc_handler   = proc_dointvec_jiffies,
 507         },
 508         {
 509                 .procname       = "inet_peer_maxttl",
 510                 .data           = &inet_peer_maxttl,
 511                 .maxlen         = sizeof(int),
 512                 .mode           = 0644,
 513                 .proc_handler   = proc_dointvec_jiffies,
 514         },
 515         {
 516                 .procname       = "tcp_mem",
 517                 .maxlen         = sizeof(sysctl_tcp_mem),
 518                 .data           = &sysctl_tcp_mem,
 519                 .mode           = 0644,
 520                 .proc_handler   = proc_doulongvec_minmax,
 521         },
 522         {
 523                 .procname       = "tcp_low_latency",
 524                 .data           = &sysctl_tcp_low_latency,
 525                 .maxlen         = sizeof(int),
 526                 .mode           = 0644,
 527                 .proc_handler   = proc_dointvec
 528         },
 529 #ifdef CONFIG_NETLABEL
 530         {
 531                 .procname       = "cipso_cache_enable",
 532                 .data           = &cipso_v4_cache_enabled,
 533                 .maxlen         = sizeof(int),
 534                 .mode           = 0644,
 535                 .proc_handler   = proc_dointvec,
 536         },
 537         {
 538                 .procname       = "cipso_cache_bucket_size",
 539                 .data           = &cipso_v4_cache_bucketsize,
 540                 .maxlen         = sizeof(int),
 541                 .mode           = 0644,
 542                 .proc_handler   = proc_dointvec,
 543         },
 544         {
 545                 .procname       = "cipso_rbm_optfmt",
 546                 .data           = &cipso_v4_rbm_optfmt,
 547                 .maxlen         = sizeof(int),
 548                 .mode           = 0644,
 549                 .proc_handler   = proc_dointvec,
 550         },
 551         {
 552                 .procname       = "cipso_rbm_strictvalid",
 553                 .data           = &cipso_v4_rbm_strictvalid,
 554                 .maxlen         = sizeof(int),
 555                 .mode           = 0644,
 556                 .proc_handler   = proc_dointvec,
 557         },
 558 #endif /* CONFIG_NETLABEL */
 559         {
 560                 .procname       = "tcp_available_ulp",
 561                 .maxlen         = TCP_ULP_BUF_MAX,
 562                 .mode           = 0444,
 563                 .proc_handler   = proc_tcp_available_ulp,
 564         },
 565         {
 566                 .procname       = "icmp_msgs_per_sec",
 567                 .data           = &sysctl_icmp_msgs_per_sec,
 568                 .maxlen         = sizeof(int),
 569                 .mode           = 0644,
 570                 .proc_handler   = proc_dointvec_minmax,
 571                 .extra1         = SYSCTL_ZERO,
 572         },
 573         {
 574                 .procname       = "icmp_msgs_burst",
 575                 .data           = &sysctl_icmp_msgs_burst,
 576                 .maxlen         = sizeof(int),
 577                 .mode           = 0644,
 578                 .proc_handler   = proc_dointvec_minmax,
 579                 .extra1         = SYSCTL_ZERO,
 580         },
 581         {
 582                 .procname       = "udp_mem",
 583                 .data           = &sysctl_udp_mem,
 584                 .maxlen         = sizeof(sysctl_udp_mem),
 585                 .mode           = 0644,
 586                 .proc_handler   = proc_doulongvec_minmax,
 587         },
 588         {
 589                 .procname       = "fib_sync_mem",
 590                 .data           = &sysctl_fib_sync_mem,
 591                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 592                 .mode           = 0644,
 593                 .proc_handler   = proc_douintvec_minmax,
 594                 .extra1         = &sysctl_fib_sync_mem_min,
 595                 .extra2         = &sysctl_fib_sync_mem_max,
 596         },
 597         {
 598                 .procname       = "tcp_rx_skb_cache",
 599                 .data           = &tcp_rx_skb_cache_key.key,
 600                 .mode           = 0644,
 601                 .proc_handler   = proc_do_static_key,
 602         },
 603         {
 604                 .procname       = "tcp_tx_skb_cache",
 605                 .data           = &tcp_tx_skb_cache_key.key,
 606                 .mode           = 0644,
 607                 .proc_handler   = proc_do_static_key,
 608         },
 609         { }
 610 };
 611
 612 static struct ctl_table ipv4_net_table[] = {
 613         {
 614                 .procname       = "icmp_echo_ignore_all",
 615                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 616                 .maxlen         = sizeof(u8),
 617                 .mode           = 0644,
 618                 .proc_handler   = proc_dou8vec_minmax,
 619         },
 620         {
 621                 .procname       = "icmp_echo_enable_probe",
 622                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 623                 .maxlen         = sizeof(u8),
 624                 .mode           = 0644,
 625                 .proc_handler   = proc_dou8vec_minmax,
 626                 .extra1         = SYSCTL_ZERO,
 627                 .extra2         = SYSCTL_ONE
 628         },
 629         {
 630                 .procname       = "icmp_echo_ignore_broadcasts",
 631                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 632                 .maxlen         = sizeof(u8),
 633                 .mode           = 0644,
 634                 .proc_handler   = proc_dou8vec_minmax,
 635         },
 636         {
 637                 .procname       = "icmp_ignore_bogus_error_responses",
 638                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 639                 .maxlen         = sizeof(u8),
 640                 .mode           = 0644,
 641                 .proc_handler   = proc_dou8vec_minmax,
 642                 .extra1         = SYSCTL_ZERO,
 643                 .extra2         = SYSCTL_ONE
 644         },
 645         {
 646                 .procname       = "icmp_errors_use_inbound_ifaddr",
 647                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 648                 .maxlen         = sizeof(u8),
 649                 .mode           = 0644,
 650                 .proc_handler   = proc_dou8vec_minmax,
 651                 .extra1         = SYSCTL_ZERO,
 652                 .extra2         = SYSCTL_ONE
 653         },
 654         {
 655                 .procname       = "icmp_ratelimit",
 656                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 657                 .maxlen         = sizeof(int),
 658                 .mode           = 0644,
 659                 .proc_handler   = proc_dointvec_ms_jiffies,
 660         },
 661         {
 662                 .procname       = "icmp_ratemask",
 663                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 664                 .maxlen         = sizeof(int),
 665                 .mode           = 0644,
 666                 .proc_handler   = proc_dointvec
 667         },
 668         {
 669                 .procname       = "ping_group_range",
 670                 .data           = &init_net.ipv4.ping_group_range.range,
 671                 .maxlen         = sizeof(gid_t)*2,
 672                 .mode           = 0644,
 673                 .proc_handler   = ipv4_ping_group_range,
 674         },
 675 #ifdef CONFIG_NET_L3_MASTER_DEV
 676         {
 677                 .procname       = "raw_l3mdev_accept",
 678                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 679                 .maxlen         = sizeof(u8),
 680                 .mode           = 0644,
 681                 .proc_handler   = proc_dou8vec_minmax,
 682                 .extra1         = SYSCTL_ZERO,
 683                 .extra2         = SYSCTL_ONE,
 684         },
 685 #endif
 686         {
 687                 .procname       = "tcp_ecn",
 688                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 689                 .maxlen         = sizeof(u8),
 690                 .mode           = 0644,
 691                 .proc_handler   = proc_dou8vec_minmax,
 692                 .extra1         = SYSCTL_ZERO,
 693                 .extra2         = SYSCTL_TWO,
 694         },
 695         {
 696                 .procname       = "tcp_ecn_fallback",
 697                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 698                 .maxlen         = sizeof(u8),
 699                 .mode           = 0644,
 700                 .proc_handler   = proc_dou8vec_minmax,
 701                 .extra1         = SYSCTL_ZERO,
 702                 .extra2         = SYSCTL_ONE,
 703         },
 704         {
 705                 .procname       = "ip_dynaddr",
 706                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 707                 .maxlen         = sizeof(u8),
 708                 .mode           = 0644,
 709                 .proc_handler   = proc_dou8vec_minmax,
 710         },
 711         {
 712                 .procname       = "ip_early_demux",
 713                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 714                 .maxlen         = sizeof(u8),
 715                 .mode           = 0644,
 716                 .proc_handler   = proc_dou8vec_minmax,
 717         },
 718         {
 719                 .procname       = "udp_early_demux",
 720                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 721                 .maxlen         = sizeof(u8),
 722                 .mode           = 0644,
 723                 .proc_handler   = proc_udp_early_demux
 724         },
 725         {
 726                 .procname       = "tcp_early_demux",
 727                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 728                 .maxlen         = sizeof(u8),
 729                 .mode           = 0644,
 730                 .proc_handler   = proc_tcp_early_demux
 731         },
 732         {
 733                 .procname       = "nexthop_compat_mode",
 734                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 735                 .maxlen         = sizeof(u8),
 736                 .mode           = 0644,
 737                 .proc_handler   = proc_dou8vec_minmax,
 738                 .extra1         = SYSCTL_ZERO,
 739                 .extra2         = SYSCTL_ONE,
 740         },
 741         {
 742                 .procname       = "ip_default_ttl",
 743                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 744                 .maxlen         = sizeof(u8),
 745                 .mode           = 0644,
 746                 .proc_handler   = proc_dou8vec_minmax,
 747                 .extra1         = &ip_ttl_min,
 748                 .extra2         = &ip_ttl_max,
 749         },
 750         {
 751                 .procname       = "ip_local_port_range",
 752                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 753                 .data           = &init_net.ipv4.ip_local_ports.range,
 754                 .mode           = 0644,
 755                 .proc_handler   = ipv4_local_port_range,
 756         },
 757         {
 758                 .procname       = "ip_local_reserved_ports",
 759                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 760                 .maxlen         = 65536,
 761                 .mode           = 0644,
 762                 .proc_handler   = proc_do_large_bitmap,
 763         },
 764         {
 765                 .procname       = "ip_no_pmtu_disc",
 766                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 767                 .maxlen         = sizeof(u8),
 768                 .mode           = 0644,
 769                 .proc_handler   = proc_dou8vec_minmax,
 770         },
 771         {
 772                 .procname       = "ip_forward_use_pmtu",
 773                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 774                 .maxlen         = sizeof(u8),
 775                 .mode           = 0644,
 776                 .proc_handler   = proc_dou8vec_minmax,
 777         },
 778         {
 779                 .procname       = "ip_forward_update_priority",
 780                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 781                 .maxlen         = sizeof(u8),
 782                 .mode           = 0644,
 783                 .proc_handler   = ipv4_fwd_update_priority,
 784                 .extra1         = SYSCTL_ZERO,
 785                 .extra2         = SYSCTL_ONE,
 786         },
 787         {
 788                 .procname       = "ip_nonlocal_bind",
 789                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 790                 .maxlen         = sizeof(u8),
 791                 .mode           = 0644,
 792                 .proc_handler   = proc_dou8vec_minmax,
 793         },
 794         {
 795                 .procname       = "ip_autobind_reuse",
 796                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 797                 .maxlen         = sizeof(u8),
 798                 .mode           = 0644,
 799                 .proc_handler   = proc_dou8vec_minmax,
 800                 .extra1         = SYSCTL_ZERO,
 801                 .extra2         = SYSCTL_ONE,
 802         },
 803         {
 804                 .procname       = "fwmark_reflect",
 805                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 806                 .maxlen         = sizeof(u8),
 807                 .mode           = 0644,
 808                 .proc_handler   = proc_dou8vec_minmax,
 809         },
 810         {
 811                 .procname       = "tcp_fwmark_accept",
 812                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 813                 .maxlen         = sizeof(u8),
 814                 .mode           = 0644,
 815                 .proc_handler   = proc_dou8vec_minmax,
 816         },
 817 #ifdef CONFIG_NET_L3_MASTER_DEV
 818         {
 819                 .procname       = "tcp_l3mdev_accept",
 820                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 821                 .maxlen         = sizeof(u8),
 822                 .mode           = 0644,
 823                 .proc_handler   = proc_dou8vec_minmax,
 824                 .extra1         = SYSCTL_ZERO,
 825                 .extra2         = SYSCTL_ONE,
 826         },
 827 #endif
 828         {
 829                 .procname       = "tcp_mtu_probing",
 830                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 831                 .maxlen         = sizeof(u8),
 832                 .mode           = 0644,
 833                 .proc_handler   = proc_dou8vec_minmax,
 834         },
 835         {
 836                 .procname       = "tcp_base_mss",
 837                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 838                 .maxlen         = sizeof(int),
 839                 .mode           = 0644,
 840                 .proc_handler   = proc_dointvec,
 841         },
 842         {
 843                 .procname       = "tcp_min_snd_mss",
 844                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 845                 .maxlen         = sizeof(int),
 846                 .mode           = 0644,
 847                 .proc_handler   = proc_dointvec_minmax,
 848                 .extra1         = &tcp_min_snd_mss_min,
 849                 .extra2         = &tcp_min_snd_mss_max,
 850         },
 851         {
 852                 .procname       = "tcp_mtu_probe_floor",
 853                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 854                 .maxlen         = sizeof(int),
 855                 .mode           = 0644,
 856                 .proc_handler   = proc_dointvec_minmax,
 857                 .extra1         = &tcp_min_snd_mss_min,
 858                 .extra2         = &tcp_min_snd_mss_max,
 859         },
 860         {
 861                 .procname       = "tcp_probe_threshold",
 862                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 863                 .maxlen         = sizeof(int),
 864                 .mode           = 0644,
 865                 .proc_handler   = proc_dointvec,
 866         },
 867         {
 868                 .procname       = "tcp_probe_interval",
 869                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 870                 .maxlen         = sizeof(u32),
 871                 .mode           = 0644,
 872                 .proc_handler   = proc_douintvec_minmax,
 873                 .extra2         = &u32_max_div_HZ,
 874         },
 875         {
 876                 .procname       = "igmp_link_local_mcast_reports",
 877                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 878                 .maxlen         = sizeof(u8),
 879                 .mode           = 0644,
 880                 .proc_handler   = proc_dou8vec_minmax,
 881         },
 882         {
 883                 .procname       = "igmp_max_memberships",
 884                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 885                 .maxlen         = sizeof(int),
 886                 .mode           = 0644,
 887                 .proc_handler   = proc_dointvec
 888         },
 889         {
 890                 .procname       = "igmp_max_msf",
 891                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 892                 .maxlen         = sizeof(int),
 893                 .mode           = 0644,
 894                 .proc_handler   = proc_dointvec
 895         },
 896 #ifdef CONFIG_IP_MULTICAST
 897         {
 898                 .procname       = "igmp_qrv",
 899                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 900                 .maxlen         = sizeof(int),
 901                 .mode           = 0644,
 902                 .proc_handler   = proc_dointvec_minmax,
 903                 .extra1         = SYSCTL_ONE
 904         },
 905 #endif
 906         {
 907                 .procname       = "tcp_congestion_control",
 908                 .data           = &init_net.ipv4.tcp_congestion_control,
 909                 .mode           = 0644,
 910                 .maxlen         = TCP_CA_NAME_MAX,
 911                 .proc_handler   = proc_tcp_congestion_control,
 912         },
 913         {
 914                 .procname       = "tcp_available_congestion_control",
 915                 .maxlen         = TCP_CA_BUF_MAX,
 916                 .mode           = 0444,
 917                 .proc_handler   = proc_tcp_available_congestion_control,
 918         },
 919         {
 920                 .procname       = "tcp_allowed_congestion_control",
 921                 .maxlen         = TCP_CA_BUF_MAX,
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_allowed_congestion_control,
 924         },
 925         {
 926                 .procname       = "tcp_keepalive_time",
 927                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 928                 .maxlen         = sizeof(int),
 929                 .mode           = 0644,
 930                 .proc_handler   = proc_dointvec_jiffies,
 931         },
 932         {
 933                 .procname       = "tcp_keepalive_probes",
 934                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 935                 .maxlen         = sizeof(u8),
 936                 .mode           = 0644,
 937                 .proc_handler   = proc_dou8vec_minmax,
 938         },
 939         {
 940                 .procname       = "tcp_keepalive_intvl",
 941                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 942                 .maxlen         = sizeof(int),
 943                 .mode           = 0644,
 944                 .proc_handler   = proc_dointvec_jiffies,
 945         },
 946         {
 947                 .procname       = "tcp_syn_retries",
 948                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 949                 .maxlen         = sizeof(u8),
 950                 .mode           = 0644,
 951                 .proc_handler   = proc_dou8vec_minmax,
 952                 .extra1         = &tcp_syn_retries_min,
 953                 .extra2         = &tcp_syn_retries_max
 954         },
 955         {
 956                 .procname       = "tcp_synack_retries",
 957                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 958                 .maxlen         = sizeof(u8),
 959                 .mode           = 0644,
 960                 .proc_handler   = proc_dou8vec_minmax,
 961         },
 962 #ifdef CONFIG_SYN_COOKIES
 963         {
 964                 .procname       = "tcp_syncookies",
 965                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 966                 .maxlen         = sizeof(u8),
 967                 .mode           = 0644,
 968                 .proc_handler   = proc_dou8vec_minmax,
 969         },
 970 #endif
 971         {
 972                 .procname       = "tcp_migrate_req",
 973                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 974                 .maxlen         = sizeof(u8),
 975                 .mode           = 0644,
 976                 .proc_handler   = proc_dou8vec_minmax,
 977                 .extra1         = SYSCTL_ZERO,
 978                 .extra2         = SYSCTL_ONE
 979         },
 980         {
 981                 .procname       = "tcp_reordering",
 982                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 983                 .maxlen         = sizeof(int),
 984                 .mode           = 0644,
 985                 .proc_handler   = proc_dointvec
 986         },
 987         {
 988                 .procname       = "tcp_retries1",
 989                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 990                 .maxlen         = sizeof(u8),
 991                 .mode           = 0644,
 992                 .proc_handler   = proc_dou8vec_minmax,
 993                 .extra2         = &tcp_retr1_max
 994         },
 995         {
 996                 .procname       = "tcp_retries2",
 997                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 998                 .maxlen         = sizeof(u8),
 999                 .mode           = 0644,
1000                 .proc_handler   = proc_dou8vec_minmax,
1001         },
1002         {
1003                 .procname       = "tcp_orphan_retries",
1004                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
1005                 .maxlen         = sizeof(u8),
1006                 .mode           = 0644,
1007                 .proc_handler   = proc_dou8vec_minmax,
1008         },
1009         {
1010                 .procname       = "tcp_fin_timeout",
1011                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
1012                 .maxlen         = sizeof(int),
1013                 .mode           = 0644,
1014                 .proc_handler   = proc_dointvec_jiffies,
1015         },
1016         {
1017                 .procname       = "tcp_notsent_lowat",
1018                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1019                 .maxlen         = sizeof(unsigned int),
1020                 .mode           = 0644,
1021                 .proc_handler   = proc_douintvec,
1022         },
1023         {
1024                 .procname       = "tcp_tw_reuse",
1025                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
1026                 .maxlen         = sizeof(u8),
1027                 .mode           = 0644,
1028                 .proc_handler   = proc_dou8vec_minmax,
1029                 .extra1         = SYSCTL_ZERO,
1030                 .extra2         = &two,
1031         },
1032         {
1033                 .procname       = "tcp_max_tw_buckets",
1034                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
1035                 .maxlen         = sizeof(int),
1036                 .mode           = 0644,
1037                 .proc_handler   = proc_dointvec
1038         },
1039         {
1040                 .procname       = "tcp_max_syn_backlog",
1041                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1042                 .maxlen         = sizeof(int),
1043                 .mode           = 0644,
1044                 .proc_handler   = proc_dointvec
1045         },
1046         {
1047                 .procname       = "tcp_fastopen",
1048                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1049                 .maxlen         = sizeof(int),
1050                 .mode           = 0644,
1051                 .proc_handler   = proc_dointvec,
1052         },
1053         {
1054                 .procname       = "tcp_fastopen_key",
1055                 .mode           = 0600,
1056                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1057                 /* maxlen to print the list of keys in hex (*2), with dashes
1058                  * separating doublewords and a comma in between keys.
1059                  */
1060                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1061                                    2 * TCP_FASTOPEN_KEY_MAX) +
1062                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1063                 .proc_handler   = proc_tcp_fastopen_key,
1064         },
1065         {
1066                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1067                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1068                 .maxlen         = sizeof(int),
1069                 .mode           = 0644,
1070                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1071                 .extra1         = SYSCTL_ZERO,
1072         },
1073 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1074         {
1075                 .procname       = "fib_multipath_use_neigh",
1076                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1077                 .maxlen         = sizeof(u8),
1078                 .mode           = 0644,
1079                 .proc_handler   = proc_dou8vec_minmax,
1080                 .extra1         = SYSCTL_ZERO,
1081                 .extra2         = SYSCTL_ONE,
1082         },
1083         {
1084                 .procname       = "fib_multipath_hash_policy",
1085                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1086                 .maxlen         = sizeof(u8),
1087                 .mode           = 0644,
1088                 .proc_handler   = proc_fib_multipath_hash_policy,
1089                 .extra1         = SYSCTL_ZERO,
1090                 .extra2         = &three,
1091         },
1092         {
1093                 .procname       = "fib_multipath_hash_fields",
1094                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1095                 .maxlen         = sizeof(u32),
1096                 .mode           = 0644,
1097                 .proc_handler   = proc_fib_multipath_hash_fields,
1098                 .extra1         = SYSCTL_ONE,
1099                 .extra2         = &fib_multipath_hash_fields_all_mask,
1100         },
1101 #endif
1102         {
1103                 .procname       = "ip_unprivileged_port_start",
1104                 .maxlen         = sizeof(int),
1105                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1106                 .mode           = 0644,
1107                 .proc_handler   = ipv4_privileged_ports,
1108         },
1109 #ifdef CONFIG_NET_L3_MASTER_DEV
1110         {
1111                 .procname       = "udp_l3mdev_accept",
1112                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1113                 .maxlen         = sizeof(u8),
1114                 .mode           = 0644,
1115                 .proc_handler   = proc_dou8vec_minmax,
1116                 .extra1         = SYSCTL_ZERO,
1117                 .extra2         = SYSCTL_ONE,
1118         },
1119 #endif
1120         {
1121                 .procname       = "tcp_sack",
1122                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1123                 .maxlen         = sizeof(u8),
1124                 .mode           = 0644,
1125                 .proc_handler   = proc_dou8vec_minmax,
1126         },
1127         {
1128                 .procname       = "tcp_window_scaling",
1129                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1130                 .maxlen         = sizeof(u8),
1131                 .mode           = 0644,
1132                 .proc_handler   = proc_dou8vec_minmax,
1133         },
1134         {
1135                 .procname       = "tcp_timestamps",
1136                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1137                 .maxlen         = sizeof(u8),
1138                 .mode           = 0644,
1139                 .proc_handler   = proc_dou8vec_minmax,
1140         },
1141         {
1142                 .procname       = "tcp_early_retrans",
1143                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1144                 .maxlen         = sizeof(u8),
1145                 .mode           = 0644,
1146                 .proc_handler   = proc_dou8vec_minmax,
1147                 .extra1         = SYSCTL_ZERO,
1148                 .extra2         = &four,
1149         },
1150         {
1151                 .procname       = "tcp_recovery",
1152                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1153                 .maxlen         = sizeof(u8),
1154                 .mode           = 0644,
1155                 .proc_handler   = proc_dou8vec_minmax,
1156         },
1157         {
1158                 .procname       = "tcp_thin_linear_timeouts",
1159                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1160                 .maxlen         = sizeof(u8),
1161                 .mode           = 0644,
1162                 .proc_handler   = proc_dou8vec_minmax,
1163         },
1164         {
1165                 .procname       = "tcp_slow_start_after_idle",
1166                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1167                 .maxlen         = sizeof(u8),
1168                 .mode           = 0644,
1169                 .proc_handler   = proc_dou8vec_minmax,
1170         },
1171         {
1172                 .procname       = "tcp_retrans_collapse",
1173                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1174                 .maxlen         = sizeof(u8),
1175                 .mode           = 0644,
1176                 .proc_handler   = proc_dou8vec_minmax,
1177         },
1178         {
1179                 .procname       = "tcp_stdurg",
1180                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1181                 .maxlen         = sizeof(u8),
1182                 .mode           = 0644,
1183                 .proc_handler   = proc_dou8vec_minmax,
1184         },
1185         {
1186                 .procname       = "tcp_rfc1337",
1187                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1188                 .maxlen         = sizeof(u8),
1189                 .mode           = 0644,
1190                 .proc_handler   = proc_dou8vec_minmax,
1191         },
1192         {
1193                 .procname       = "tcp_abort_on_overflow",
1194                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1195                 .maxlen         = sizeof(u8),
1196                 .mode           = 0644,
1197                 .proc_handler   = proc_dou8vec_minmax,
1198         },
1199         {
1200                 .procname       = "tcp_fack",
1201                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1202                 .maxlen         = sizeof(u8),
1203                 .mode           = 0644,
1204                 .proc_handler   = proc_dou8vec_minmax,
1205         },
1206         {
1207                 .procname       = "tcp_max_reordering",
1208                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1209                 .maxlen         = sizeof(int),
1210                 .mode           = 0644,
1211                 .proc_handler   = proc_dointvec
1212         },
1213         {
1214                 .procname       = "tcp_dsack",
1215                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1216                 .maxlen         = sizeof(u8),
1217                 .mode           = 0644,
1218                 .proc_handler   = proc_dou8vec_minmax,
1219         },
1220         {
1221                 .procname       = "tcp_app_win",
1222                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1223                 .maxlen         = sizeof(u8),
1224                 .mode           = 0644,
1225                 .proc_handler   = proc_dou8vec_minmax,
1226         },
1227         {
1228                 .procname       = "tcp_adv_win_scale",
1229                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1230                 .maxlen         = sizeof(int),
1231                 .mode           = 0644,
1232                 .proc_handler   = proc_dointvec_minmax,
1233                 .extra1         = &tcp_adv_win_scale_min,
1234                 .extra2         = &tcp_adv_win_scale_max,
1235         },
1236         {
1237                 .procname       = "tcp_frto",
1238                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1239                 .maxlen         = sizeof(u8),
1240                 .mode           = 0644,
1241                 .proc_handler   = proc_dou8vec_minmax,
1242         },
1243         {
1244                 .procname       = "tcp_no_metrics_save",
1245                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1246                 .maxlen         = sizeof(u8),
1247                 .mode           = 0644,
1248                 .proc_handler   = proc_dou8vec_minmax,
1249         },
1250         {
1251                 .procname       = "tcp_no_ssthresh_metrics_save",
1252                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1253                 .maxlen         = sizeof(u8),
1254                 .mode           = 0644,
1255                 .proc_handler   = proc_dou8vec_minmax,
1256                 .extra1         = SYSCTL_ZERO,
1257                 .extra2         = SYSCTL_ONE,
1258         },
1259         {
1260                 .procname       = "tcp_moderate_rcvbuf",
1261                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1262                 .maxlen         = sizeof(u8),
1263                 .mode           = 0644,
1264                 .proc_handler   = proc_dou8vec_minmax,
1265         },
1266         {
1267                 .procname       = "tcp_tso_win_divisor",
1268                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1269                 .maxlen         = sizeof(u8),
1270                 .mode           = 0644,
1271                 .proc_handler   = proc_dou8vec_minmax,
1272         },
1273         {
1274                 .procname       = "tcp_workaround_signed_windows",
1275                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1276                 .maxlen         = sizeof(u8),
1277                 .mode           = 0644,
1278                 .proc_handler   = proc_dou8vec_minmax,
1279         },
1280         {
1281                 .procname       = "tcp_limit_output_bytes",
1282                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1283                 .maxlen         = sizeof(int),
1284                 .mode           = 0644,
1285                 .proc_handler   = proc_dointvec
1286         },
1287         {
1288                 .procname       = "tcp_challenge_ack_limit",
1289                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1290                 .maxlen         = sizeof(int),
1291                 .mode           = 0644,
1292                 .proc_handler   = proc_dointvec
1293         },
1294         {
1295                 .procname       = "tcp_min_tso_segs",
1296                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1297                 .maxlen         = sizeof(u8),
1298                 .mode           = 0644,
1299                 .proc_handler   = proc_dou8vec_minmax,
1300                 .extra1         = SYSCTL_ONE,
1301         },
1302         {
1303                 .procname       = "tcp_min_rtt_wlen",
1304                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1305                 .maxlen         = sizeof(int),
1306                 .mode           = 0644,
1307                 .proc_handler   = proc_dointvec_minmax,
1308                 .extra1         = SYSCTL_ZERO,
1309                 .extra2         = &one_day_secs
1310         },
1311         {
1312                 .procname       = "tcp_autocorking",
1313                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1314                 .maxlen         = sizeof(u8),
1315                 .mode           = 0644,
1316                 .proc_handler   = proc_dou8vec_minmax,
1317                 .extra1         = SYSCTL_ZERO,
1318                 .extra2         = SYSCTL_ONE,
1319         },
1320         {
1321                 .procname       = "tcp_invalid_ratelimit",
1322                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1323                 .maxlen         = sizeof(int),
1324                 .mode           = 0644,
1325                 .proc_handler   = proc_dointvec_ms_jiffies,
1326         },
1327         {
1328                 .procname       = "tcp_pacing_ss_ratio",
1329                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1330                 .maxlen         = sizeof(int),
1331                 .mode           = 0644,
1332                 .proc_handler   = proc_dointvec_minmax,
1333                 .extra1         = SYSCTL_ZERO,
1334                 .extra2         = &thousand,
1335         },
1336         {
1337                 .procname       = "tcp_pacing_ca_ratio",
1338                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1339                 .maxlen         = sizeof(int),
1340                 .mode           = 0644,
1341                 .proc_handler   = proc_dointvec_minmax,
1342                 .extra1         = SYSCTL_ZERO,
1343                 .extra2         = &thousand,
1344         },
1345         {
1346                 .procname       = "tcp_wmem",
1347                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1348                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1349                 .mode           = 0644,
1350                 .proc_handler   = proc_dointvec_minmax,
1351                 .extra1         = SYSCTL_ONE,
1352         },
1353         {
1354                 .procname       = "tcp_rmem",
1355                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1356                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1357                 .mode           = 0644,
1358                 .proc_handler   = proc_dointvec_minmax,
1359                 .extra1         = SYSCTL_ONE,
1360         },
1361         {
1362                 .procname       = "tcp_comp_sack_delay_ns",
1363                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1364                 .maxlen         = sizeof(unsigned long),
1365                 .mode           = 0644,
1366                 .proc_handler   = proc_doulongvec_minmax,
1367         },
1368         {
1369                 .procname       = "tcp_comp_sack_slack_ns",
1370                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1371                 .maxlen         = sizeof(unsigned long),
1372                 .mode           = 0644,
1373                 .proc_handler   = proc_doulongvec_minmax,
1374         },
1375         {
1376                 .procname       = "tcp_comp_sack_nr",
1377                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1378                 .maxlen         = sizeof(u8),
1379                 .mode           = 0644,
1380                 .proc_handler   = proc_dou8vec_minmax,
1381                 .extra1         = SYSCTL_ZERO,
1382         },
1383         {
1384                 .procname       = "tcp_reflect_tos",
1385                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1386                 .maxlen         = sizeof(u8),
1387                 .mode           = 0644,
1388                 .proc_handler   = proc_dou8vec_minmax,
1389                 .extra1         = SYSCTL_ZERO,
1390                 .extra2         = SYSCTL_ONE,
1391         },
1392         {
1393                 .procname       = "udp_rmem_min",
1394                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1395                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1396                 .mode           = 0644,
1397                 .proc_handler   = proc_dointvec_minmax,
1398                 .extra1         = SYSCTL_ONE
1399         },
1400         {
1401                 .procname       = "udp_wmem_min",
1402                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1403                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1404                 .mode           = 0644,
1405                 .proc_handler   = proc_dointvec_minmax,
1406                 .extra1         = SYSCTL_ONE
1407         },
1408         {
1409                 .procname       = "fib_notify_on_flag_change",
1410                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1411                 .maxlen         = sizeof(u8),
1412                 .mode           = 0644,
1413                 .proc_handler   = proc_dou8vec_minmax,
1414                 .extra1         = SYSCTL_ZERO,
1415                 .extra2         = &two,
1416         },
1417         { }
1418 };
1419
1420 static __net_init int ipv4_sysctl_init_net(struct net *net)
1421 {
1422         struct ctl_table *table;
1423
1424         table = ipv4_net_table;
1425         if (!net_eq(net, &init_net)) {
1426                 int i;
1427
1428                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1429                 if (!table)
1430                         goto err_alloc;
1431
1432                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1433                         if (table[i].data) {
1434                                 /* Update the variables to point into
1435                                  * the current struct net
1436                                  */
1437                                 table[i].data += (void *)net - (void *)&init_net;
1438                         } else {
1439                                 /* Entries without data pointer are global;
1440                                  * Make them read-only in non-init_net ns
1441                                  */
1442                                 table[i].mode &= ~0222;
1443                         }
1444                 }
1445         }
1446
1447         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1448         if (!net->ipv4.ipv4_hdr)
1449                 goto err_reg;
1450
1451         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1452         if (!net->ipv4.sysctl_local_reserved_ports)
1453                 goto err_ports;
1454
1455         return 0;
1456
1457 err_ports:
1458         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1459 err_reg:
1460         if (!net_eq(net, &init_net))
1461                 kfree(table);
1462 err_alloc:
1463         return -ENOMEM;
1464 }
1465
1466 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1467 {
1468         struct ctl_table *table;
1469
1470         kfree(net->ipv4.sysctl_local_reserved_ports);
1471         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1472         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1473         kfree(table);
1474 }
1475
1476 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1477         .init = ipv4_sysctl_init_net,
1478         .exit = ipv4_sysctl_exit_net,
1479 };
1480
1481 static __init int sysctl_ipv4_init(void)
1482 {
1483         struct ctl_table_header *hdr;
1484
1485         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1486         if (!hdr)
1487                 return -ENOMEM;
1488
1489         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1490                 unregister_net_sysctl_table(hdr);
1491                 return -ENOMEM;
1492         }
1493
1494         return 0;
1495 }
1496
1497 __initcall(sysctl_ipv4_init);