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