net/ipv4/sysctl_net_ipv4.c

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