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_app_win_max = 31;
  29 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  30 static int tcp_min_snd_mss_max = 65535;
  31 static int ip_privileged_port_min;
  32 static int ip_privileged_port_max = 65535;
  33 static int ip_ttl_min = 1;
  34 static int ip_ttl_max = 255;
  35 static int tcp_syn_retries_min = 1;
  36 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  37 static int tcp_syn_linear_timeouts_max = MAX_TCP_SYNCNT;
  38 static unsigned long ip_ping_group_range_min[] = { 0, 0 };
  39 static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  40 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  41 static int one_day_secs = 24 * 3600;
  42 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
  43         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
  44 static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024;
  45 static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX;
  46 static int tcp_plb_max_rounds = 31;
  47 static int tcp_plb_max_cong_thresh = 256;
  48
  49 /* obsolete */
  50 static int sysctl_tcp_low_latency __read_mostly;
  51
  52 /* Update system visible IP port range */
  53 static void set_local_port_range(struct net *net, unsigned int low, unsigned int high)
  54 {
  55         bool same_parity = !((low ^ high) & 1);
  56
  57         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  58                 net->ipv4.ip_local_ports.warned = true;
  59                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  60         }
  61         WRITE_ONCE(net->ipv4.ip_local_ports.range, high << 16 | low);
  62 }
  63
  64 /* Validate changes from /proc interface. */
  65 static int ipv4_local_port_range(const struct ctl_table *table, int write,
  66                                  void *buffer, size_t *lenp, loff_t *ppos)
  67 {
  68         struct net *net = table->data;
  69         int ret;
  70         int range[2];
  71         struct ctl_table tmp = {
  72                 .data = &range,
  73                 .maxlen = sizeof(range),
  74                 .mode = table->mode,
  75                 .extra1 = &ip_local_port_range_min,
  76                 .extra2 = &ip_local_port_range_max,
  77         };
  78
  79         inet_get_local_port_range(net, &range[0], &range[1]);
  80
  81         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  82
  83         if (write && ret == 0) {
  84                 /* Ensure that the upper limit is not smaller than the lower,
  85                  * and that the lower does not encroach upon the privileged
  86                  * port limit.
  87                  */
  88                 if ((range[1] < range[0]) ||
  89                     (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
  90                         ret = -EINVAL;
  91                 else
  92                         set_local_port_range(net, range[0], range[1]);
  93         }
  94
  95         return ret;
  96 }
  97
  98 /* Validate changes from /proc interface. */
  99 static int ipv4_privileged_ports(const struct ctl_table *table, int write,
 100                                 void *buffer, size_t *lenp, loff_t *ppos)
 101 {
 102         struct net *net = container_of(table->data, struct net,
 103             ipv4.sysctl_ip_prot_sock);
 104         int ret;
 105         int pports;
 106         int range[2];
 107         struct ctl_table tmp = {
 108                 .data = &pports,
 109                 .maxlen = sizeof(pports),
 110                 .mode = table->mode,
 111                 .extra1 = &ip_privileged_port_min,
 112                 .extra2 = &ip_privileged_port_max,
 113         };
 114
 115         pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
 116
 117         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 118
 119         if (write && ret == 0) {
 120                 inet_get_local_port_range(net, &range[0], &range[1]);
 121                 /* Ensure that the local port range doesn't overlap with the
 122                  * privileged port range.
 123                  */
 124                 if (range[0] < pports)
 125                         ret = -EINVAL;
 126                 else
 127                         WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
 128         }
 129
 130         return ret;
 131 }
 132
 133 static void inet_get_ping_group_range_table(const struct ctl_table *table,
 134                                             kgid_t *low, kgid_t *high)
 135 {
 136         kgid_t *data = table->data;
 137         struct net *net =
 138                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 139         unsigned int seq;
 140         do {
 141                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 142
 143                 *low = data[0];
 144                 *high = data[1];
 145         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 146 }
 147
 148 /* Update system visible IP port range */
 149 static void set_ping_group_range(const struct ctl_table *table,
 150                                  kgid_t low, kgid_t high)
 151 {
 152         kgid_t *data = table->data;
 153         struct net *net =
 154                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 155         write_seqlock(&net->ipv4.ping_group_range.lock);
 156         data[0] = low;
 157         data[1] = high;
 158         write_sequnlock(&net->ipv4.ping_group_range.lock);
 159 }
 160
 161 /* Validate changes from /proc interface. */
 162 static int ipv4_ping_group_range(const struct ctl_table *table, int write,
 163                                  void *buffer, size_t *lenp, loff_t *ppos)
 164 {
 165         struct user_namespace *user_ns = current_user_ns();
 166         int ret;
 167         unsigned long urange[2];
 168         kgid_t low, high;
 169         struct ctl_table tmp = {
 170                 .data = &urange,
 171                 .maxlen = sizeof(urange),
 172                 .mode = table->mode,
 173                 .extra1 = &ip_ping_group_range_min,
 174                 .extra2 = &ip_ping_group_range_max,
 175         };
 176
 177         inet_get_ping_group_range_table(table, &low, &high);
 178         urange[0] = from_kgid_munged(user_ns, low);
 179         urange[1] = from_kgid_munged(user_ns, high);
 180         ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
 181
 182         if (write && ret == 0) {
 183                 low = make_kgid(user_ns, urange[0]);
 184                 high = make_kgid(user_ns, urange[1]);
 185                 if (!gid_valid(low) || !gid_valid(high))
 186                         return -EINVAL;
 187                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 188                         low = make_kgid(&init_user_ns, 1);
 189                         high = make_kgid(&init_user_ns, 0);
 190                 }
 191                 set_ping_group_range(table, low, high);
 192         }
 193
 194         return ret;
 195 }
 196
 197 static int ipv4_fwd_update_priority(const struct ctl_table *table, int write,
 198                                     void *buffer, size_t *lenp, loff_t *ppos)
 199 {
 200         struct net *net;
 201         int ret;
 202
 203         net = container_of(table->data, struct net,
 204                            ipv4.sysctl_ip_fwd_update_priority);
 205         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 206         if (write && ret == 0)
 207                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 208                                         net);
 209
 210         return ret;
 211 }
 212
 213 static int proc_tcp_congestion_control(const struct ctl_table *ctl, int write,
 214                                        void *buffer, size_t *lenp, loff_t *ppos)
 215 {
 216         struct net *net = container_of(ctl->data, struct net,
 217                                        ipv4.tcp_congestion_control);
 218         char val[TCP_CA_NAME_MAX];
 219         struct ctl_table tbl = {
 220                 .data = val,
 221                 .maxlen = TCP_CA_NAME_MAX,
 222         };
 223         int ret;
 224
 225         tcp_get_default_congestion_control(net, val);
 226
 227         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 228         if (write && ret == 0)
 229                 ret = tcp_set_default_congestion_control(net, val);
 230         return ret;
 231 }
 232
 233 static int proc_tcp_available_congestion_control(const struct ctl_table *ctl,
 234                                                  int write, void *buffer,
 235                                                  size_t *lenp, loff_t *ppos)
 236 {
 237         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 238         int ret;
 239
 240         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 241         if (!tbl.data)
 242                 return -ENOMEM;
 243         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 244         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 245         kfree(tbl.data);
 246         return ret;
 247 }
 248
 249 static int proc_allowed_congestion_control(const struct ctl_table *ctl,
 250                                            int write, void *buffer,
 251                                            size_t *lenp, loff_t *ppos)
 252 {
 253         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 254         int ret;
 255
 256         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 257         if (!tbl.data)
 258                 return -ENOMEM;
 259
 260         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 261         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 262         if (write && ret == 0)
 263                 ret = tcp_set_allowed_congestion_control(tbl.data);
 264         kfree(tbl.data);
 265         return ret;
 266 }
 267
 268 static int sscanf_key(char *buf, __le32 *key)
 269 {
 270         u32 user_key[4];
 271         int i, ret = 0;
 272
 273         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 274                    user_key + 2, user_key + 3) != 4) {
 275                 ret = -EINVAL;
 276         } else {
 277                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 278                         key[i] = cpu_to_le32(user_key[i]);
 279         }
 280         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 281                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 282
 283         return ret;
 284 }
 285
 286 static int proc_tcp_fastopen_key(const struct ctl_table *table, int write,
 287                                  void *buffer, size_t *lenp, loff_t *ppos)
 288 {
 289         struct net *net = container_of(table->data, struct net,
 290             ipv4.sysctl_tcp_fastopen);
 291         /* maxlen to print the list of keys in hex (*2), with dashes
 292          * separating doublewords and a comma in between keys.
 293          */
 294         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 295                                             2 * TCP_FASTOPEN_KEY_MAX) +
 296                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 297         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 298         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 299         char *backup_data;
 300         int ret, i = 0, off = 0, n_keys;
 301
 302         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 303         if (!tbl.data)
 304                 return -ENOMEM;
 305
 306         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 307         if (!n_keys) {
 308                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 309                 n_keys = 1;
 310         }
 311
 312         for (i = 0; i < n_keys * 4; i++)
 313                 user_key[i] = le32_to_cpu(key[i]);
 314
 315         for (i = 0; i < n_keys; i++) {
 316                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 317                                 "%08x-%08x-%08x-%08x",
 318                                 user_key[i * 4],
 319                                 user_key[i * 4 + 1],
 320                                 user_key[i * 4 + 2],
 321                                 user_key[i * 4 + 3]);
 322
 323                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 324                         break;
 325
 326                 if (i + 1 < n_keys)
 327                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 328         }
 329
 330         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 331
 332         if (write && ret == 0) {
 333                 backup_data = strchr(tbl.data, ',');
 334                 if (backup_data) {
 335                         *backup_data = '\0';
 336                         backup_data++;
 337                 }
 338                 if (sscanf_key(tbl.data, key)) {
 339                         ret = -EINVAL;
 340                         goto bad_key;
 341                 }
 342                 if (backup_data) {
 343                         if (sscanf_key(backup_data, key + 4)) {
 344                                 ret = -EINVAL;
 345                                 goto bad_key;
 346                         }
 347                 }
 348                 tcp_fastopen_reset_cipher(net, NULL, key,
 349                                           backup_data ? key + 4 : NULL);
 350         }
 351
 352 bad_key:
 353         kfree(tbl.data);
 354         return ret;
 355 }
 356
 357 static int proc_tfo_blackhole_detect_timeout(const struct ctl_table *table,
 358                                              int write, void *buffer,
 359                                              size_t *lenp, loff_t *ppos)
 360 {
 361         struct net *net = container_of(table->data, struct net,
 362             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 363         int ret;
 364
 365         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 366         if (write && ret == 0)
 367                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 368
 369         return ret;
 370 }
 371
 372 static int proc_tcp_available_ulp(const struct ctl_table *ctl,
 373                                   int write, void *buffer, size_t *lenp,
 374                                   loff_t *ppos)
 375 {
 376         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 377         int ret;
 378
 379         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 380         if (!tbl.data)
 381                 return -ENOMEM;
 382         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 383         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 384         kfree(tbl.data);
 385
 386         return ret;
 387 }
 388
 389 static int proc_tcp_ehash_entries(const struct ctl_table *table, int write,
 390                                   void *buffer, size_t *lenp, loff_t *ppos)
 391 {
 392         struct net *net = container_of(table->data, struct net,
 393                                        ipv4.sysctl_tcp_child_ehash_entries);
 394         struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo;
 395         int tcp_ehash_entries;
 396         struct ctl_table tbl;
 397
 398         tcp_ehash_entries = hinfo->ehash_mask + 1;
 399
 400         /* A negative number indicates that the child netns
 401          * shares the global ehash.
 402          */
 403         if (!net_eq(net, &init_net) && !hinfo->pernet)
 404                 tcp_ehash_entries *= -1;
 405
 406         memset(&tbl, 0, sizeof(tbl));
 407         tbl.data = &tcp_ehash_entries;
 408         tbl.maxlen = sizeof(int);
 409
 410         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
 411 }
 412
 413 static int proc_udp_hash_entries(const struct ctl_table *table, int write,
 414                                  void *buffer, size_t *lenp, loff_t *ppos)
 415 {
 416         struct net *net = container_of(table->data, struct net,
 417                                        ipv4.sysctl_udp_child_hash_entries);
 418         int udp_hash_entries;
 419         struct ctl_table tbl;
 420
 421         udp_hash_entries = net->ipv4.udp_table->mask + 1;
 422
 423         /* A negative number indicates that the child netns
 424          * shares the global udp_table.
 425          */
 426         if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table)
 427                 udp_hash_entries *= -1;
 428
 429         memset(&tbl, 0, sizeof(tbl));
 430         tbl.data = &udp_hash_entries;
 431         tbl.maxlen = sizeof(int);
 432
 433         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
 434 }
 435
 436 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 437 static int proc_fib_multipath_hash_policy(const struct ctl_table *table, int write,
 438                                           void *buffer, size_t *lenp,
 439                                           loff_t *ppos)
 440 {
 441         struct net *net = container_of(table->data, struct net,
 442             ipv4.sysctl_fib_multipath_hash_policy);
 443         int ret;
 444
 445         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 446         if (write && ret == 0)
 447                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 448
 449         return ret;
 450 }
 451
 452 static int proc_fib_multipath_hash_fields(const struct ctl_table *table, int write,
 453                                           void *buffer, size_t *lenp,
 454                                           loff_t *ppos)
 455 {
 456         struct net *net;
 457         int ret;
 458
 459         net = container_of(table->data, struct net,
 460                            ipv4.sysctl_fib_multipath_hash_fields);
 461         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
 462         if (write && ret == 0)
 463                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 464
 465         return ret;
 466 }
 467
 468 static u32 proc_fib_multipath_hash_rand_seed __ro_after_init;
 469
 470 static void proc_fib_multipath_hash_init_rand_seed(void)
 471 {
 472         get_random_bytes(&proc_fib_multipath_hash_rand_seed,
 473                          sizeof(proc_fib_multipath_hash_rand_seed));
 474 }
 475
 476 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed)
 477 {
 478         struct sysctl_fib_multipath_hash_seed new = {
 479                 .user_seed = user_seed,
 480                 .mp_seed = (user_seed ? user_seed :
 481                             proc_fib_multipath_hash_rand_seed),
 482         };
 483
 484         WRITE_ONCE(net->ipv4.sysctl_fib_multipath_hash_seed, new);
 485 }
 486
 487 static int proc_fib_multipath_hash_seed(const struct ctl_table *table, int write,
 488                                         void *buffer, size_t *lenp,
 489                                         loff_t *ppos)
 490 {
 491         struct sysctl_fib_multipath_hash_seed *mphs;
 492         struct net *net = table->data;
 493         struct ctl_table tmp;
 494         u32 user_seed;
 495         int ret;
 496
 497         mphs = &net->ipv4.sysctl_fib_multipath_hash_seed;
 498         user_seed = mphs->user_seed;
 499
 500         tmp = *table;
 501         tmp.data = &user_seed;
 502
 503         ret = proc_douintvec_minmax(&tmp, write, buffer, lenp, ppos);
 504
 505         if (write && ret == 0) {
 506                 proc_fib_multipath_hash_set_seed(net, user_seed);
 507                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 508         }
 509
 510         return ret;
 511 }
 512 #else
 513
 514 static void proc_fib_multipath_hash_init_rand_seed(void)
 515 {
 516 }
 517
 518 static void proc_fib_multipath_hash_set_seed(struct net *net, u32 user_seed)
 519 {
 520 }
 521
 522 #endif
 523
 524 static struct ctl_table ipv4_table[] = {
 525         {
 526                 .procname       = "tcp_max_orphans",
 527                 .data           = &sysctl_tcp_max_orphans,
 528                 .maxlen         = sizeof(int),
 529                 .mode           = 0644,
 530                 .proc_handler   = proc_dointvec
 531         },
 532         {
 533                 .procname       = "inet_peer_threshold",
 534                 .data           = &inet_peer_threshold,
 535                 .maxlen         = sizeof(int),
 536                 .mode           = 0644,
 537                 .proc_handler   = proc_dointvec
 538         },
 539         {
 540                 .procname       = "inet_peer_minttl",
 541                 .data           = &inet_peer_minttl,
 542                 .maxlen         = sizeof(int),
 543                 .mode           = 0644,
 544                 .proc_handler   = proc_dointvec_jiffies,
 545         },
 546         {
 547                 .procname       = "inet_peer_maxttl",
 548                 .data           = &inet_peer_maxttl,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = proc_dointvec_jiffies,
 552         },
 553         {
 554                 .procname       = "tcp_mem",
 555                 .maxlen         = sizeof(sysctl_tcp_mem),
 556                 .data           = &sysctl_tcp_mem,
 557                 .mode           = 0644,
 558                 .proc_handler   = proc_doulongvec_minmax,
 559         },
 560         {
 561                 .procname       = "tcp_low_latency",
 562                 .data           = &sysctl_tcp_low_latency,
 563                 .maxlen         = sizeof(int),
 564                 .mode           = 0644,
 565                 .proc_handler   = proc_dointvec
 566         },
 567 #ifdef CONFIG_NETLABEL
 568         {
 569                 .procname       = "cipso_cache_enable",
 570                 .data           = &cipso_v4_cache_enabled,
 571                 .maxlen         = sizeof(int),
 572                 .mode           = 0644,
 573                 .proc_handler   = proc_dointvec,
 574         },
 575         {
 576                 .procname       = "cipso_cache_bucket_size",
 577                 .data           = &cipso_v4_cache_bucketsize,
 578                 .maxlen         = sizeof(int),
 579                 .mode           = 0644,
 580                 .proc_handler   = proc_dointvec,
 581         },
 582         {
 583                 .procname       = "cipso_rbm_optfmt",
 584                 .data           = &cipso_v4_rbm_optfmt,
 585                 .maxlen         = sizeof(int),
 586                 .mode           = 0644,
 587                 .proc_handler   = proc_dointvec,
 588         },
 589         {
 590                 .procname       = "cipso_rbm_strictvalid",
 591                 .data           = &cipso_v4_rbm_strictvalid,
 592                 .maxlen         = sizeof(int),
 593                 .mode           = 0644,
 594                 .proc_handler   = proc_dointvec,
 595         },
 596 #endif /* CONFIG_NETLABEL */
 597         {
 598                 .procname       = "tcp_available_ulp",
 599                 .maxlen         = TCP_ULP_BUF_MAX,
 600                 .mode           = 0444,
 601                 .proc_handler   = proc_tcp_available_ulp,
 602         },
 603         {
 604                 .procname       = "icmp_msgs_per_sec",
 605                 .data           = &sysctl_icmp_msgs_per_sec,
 606                 .maxlen         = sizeof(int),
 607                 .mode           = 0644,
 608                 .proc_handler   = proc_dointvec_minmax,
 609                 .extra1         = SYSCTL_ZERO,
 610         },
 611         {
 612                 .procname       = "icmp_msgs_burst",
 613                 .data           = &sysctl_icmp_msgs_burst,
 614                 .maxlen         = sizeof(int),
 615                 .mode           = 0644,
 616                 .proc_handler   = proc_dointvec_minmax,
 617                 .extra1         = SYSCTL_ZERO,
 618         },
 619         {
 620                 .procname       = "udp_mem",
 621                 .data           = &sysctl_udp_mem,
 622                 .maxlen         = sizeof(sysctl_udp_mem),
 623                 .mode           = 0644,
 624                 .proc_handler   = proc_doulongvec_minmax,
 625         },
 626         {
 627                 .procname       = "fib_sync_mem",
 628                 .data           = &sysctl_fib_sync_mem,
 629                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 630                 .mode           = 0644,
 631                 .proc_handler   = proc_douintvec_minmax,
 632                 .extra1         = &sysctl_fib_sync_mem_min,
 633                 .extra2         = &sysctl_fib_sync_mem_max,
 634         },
 635 };
 636
 637 static struct ctl_table ipv4_net_table[] = {
 638         {
 639                 .procname       = "tcp_max_tw_buckets",
 640                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 641                 .maxlen         = sizeof(int),
 642                 .mode           = 0644,
 643                 .proc_handler   = proc_dointvec
 644         },
 645         {
 646                 .procname       = "icmp_echo_ignore_all",
 647                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 648                 .maxlen         = sizeof(u8),
 649                 .mode           = 0644,
 650                 .proc_handler   = proc_dou8vec_minmax,
 651                 .extra1         = SYSCTL_ZERO,
 652                 .extra2         = SYSCTL_ONE
 653         },
 654         {
 655                 .procname       = "icmp_echo_enable_probe",
 656                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 657                 .maxlen         = sizeof(u8),
 658                 .mode           = 0644,
 659                 .proc_handler   = proc_dou8vec_minmax,
 660                 .extra1         = SYSCTL_ZERO,
 661                 .extra2         = SYSCTL_ONE
 662         },
 663         {
 664                 .procname       = "icmp_echo_ignore_broadcasts",
 665                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 666                 .maxlen         = sizeof(u8),
 667                 .mode           = 0644,
 668                 .proc_handler   = proc_dou8vec_minmax,
 669                 .extra1         = SYSCTL_ZERO,
 670                 .extra2         = SYSCTL_ONE
 671         },
 672         {
 673                 .procname       = "icmp_ignore_bogus_error_responses",
 674                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 675                 .maxlen         = sizeof(u8),
 676                 .mode           = 0644,
 677                 .proc_handler   = proc_dou8vec_minmax,
 678                 .extra1         = SYSCTL_ZERO,
 679                 .extra2         = SYSCTL_ONE
 680         },
 681         {
 682                 .procname       = "icmp_errors_use_inbound_ifaddr",
 683                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 684                 .maxlen         = sizeof(u8),
 685                 .mode           = 0644,
 686                 .proc_handler   = proc_dou8vec_minmax,
 687                 .extra1         = SYSCTL_ZERO,
 688                 .extra2         = SYSCTL_ONE
 689         },
 690         {
 691                 .procname       = "icmp_ratelimit",
 692                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 693                 .maxlen         = sizeof(int),
 694                 .mode           = 0644,
 695                 .proc_handler   = proc_dointvec_ms_jiffies,
 696         },
 697         {
 698                 .procname       = "icmp_ratemask",
 699                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 700                 .maxlen         = sizeof(int),
 701                 .mode           = 0644,
 702                 .proc_handler   = proc_dointvec
 703         },
 704         {
 705                 .procname       = "ping_group_range",
 706                 .data           = &init_net.ipv4.ping_group_range.range,
 707                 .maxlen         = sizeof(gid_t)*2,
 708                 .mode           = 0644,
 709                 .proc_handler   = ipv4_ping_group_range,
 710         },
 711 #ifdef CONFIG_NET_L3_MASTER_DEV
 712         {
 713                 .procname       = "raw_l3mdev_accept",
 714                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 715                 .maxlen         = sizeof(u8),
 716                 .mode           = 0644,
 717                 .proc_handler   = proc_dou8vec_minmax,
 718                 .extra1         = SYSCTL_ZERO,
 719                 .extra2         = SYSCTL_ONE,
 720         },
 721 #endif
 722         {
 723                 .procname       = "tcp_ecn",
 724                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 725                 .maxlen         = sizeof(u8),
 726                 .mode           = 0644,
 727                 .proc_handler   = proc_dou8vec_minmax,
 728                 .extra1         = SYSCTL_ZERO,
 729                 .extra2         = SYSCTL_TWO,
 730         },
 731         {
 732                 .procname       = "tcp_ecn_fallback",
 733                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 734                 .maxlen         = sizeof(u8),
 735                 .mode           = 0644,
 736                 .proc_handler   = proc_dou8vec_minmax,
 737                 .extra1         = SYSCTL_ZERO,
 738                 .extra2         = SYSCTL_ONE,
 739         },
 740         {
 741                 .procname       = "ip_dynaddr",
 742                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 743                 .maxlen         = sizeof(u8),
 744                 .mode           = 0644,
 745                 .proc_handler   = proc_dou8vec_minmax,
 746         },
 747         {
 748                 .procname       = "ip_early_demux",
 749                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 750                 .maxlen         = sizeof(u8),
 751                 .mode           = 0644,
 752                 .proc_handler   = proc_dou8vec_minmax,
 753         },
 754         {
 755                 .procname       = "udp_early_demux",
 756                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 757                 .maxlen         = sizeof(u8),
 758                 .mode           = 0644,
 759                 .proc_handler   = proc_dou8vec_minmax,
 760         },
 761         {
 762                 .procname       = "tcp_early_demux",
 763                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 764                 .maxlen         = sizeof(u8),
 765                 .mode           = 0644,
 766                 .proc_handler   = proc_dou8vec_minmax,
 767         },
 768         {
 769                 .procname       = "nexthop_compat_mode",
 770                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 771                 .maxlen         = sizeof(u8),
 772                 .mode           = 0644,
 773                 .proc_handler   = proc_dou8vec_minmax,
 774                 .extra1         = SYSCTL_ZERO,
 775                 .extra2         = SYSCTL_ONE,
 776         },
 777         {
 778                 .procname       = "ip_default_ttl",
 779                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 780                 .maxlen         = sizeof(u8),
 781                 .mode           = 0644,
 782                 .proc_handler   = proc_dou8vec_minmax,
 783                 .extra1         = &ip_ttl_min,
 784                 .extra2         = &ip_ttl_max,
 785         },
 786         {
 787                 .procname       = "ip_local_port_range",
 788                 .maxlen         = 0,
 789                 .data           = &init_net,
 790                 .mode           = 0644,
 791                 .proc_handler   = ipv4_local_port_range,
 792         },
 793         {
 794                 .procname       = "ip_local_reserved_ports",
 795                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 796                 .maxlen         = 65536,
 797                 .mode           = 0644,
 798                 .proc_handler   = proc_do_large_bitmap,
 799         },
 800         {
 801                 .procname       = "ip_no_pmtu_disc",
 802                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 803                 .maxlen         = sizeof(u8),
 804                 .mode           = 0644,
 805                 .proc_handler   = proc_dou8vec_minmax,
 806         },
 807         {
 808                 .procname       = "ip_forward_use_pmtu",
 809                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 810                 .maxlen         = sizeof(u8),
 811                 .mode           = 0644,
 812                 .proc_handler   = proc_dou8vec_minmax,
 813         },
 814         {
 815                 .procname       = "ip_forward_update_priority",
 816                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 817                 .maxlen         = sizeof(u8),
 818                 .mode           = 0644,
 819                 .proc_handler   = ipv4_fwd_update_priority,
 820                 .extra1         = SYSCTL_ZERO,
 821                 .extra2         = SYSCTL_ONE,
 822         },
 823         {
 824                 .procname       = "ip_nonlocal_bind",
 825                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 826                 .maxlen         = sizeof(u8),
 827                 .mode           = 0644,
 828                 .proc_handler   = proc_dou8vec_minmax,
 829         },
 830         {
 831                 .procname       = "ip_autobind_reuse",
 832                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 833                 .maxlen         = sizeof(u8),
 834                 .mode           = 0644,
 835                 .proc_handler   = proc_dou8vec_minmax,
 836                 .extra1         = SYSCTL_ZERO,
 837                 .extra2         = SYSCTL_ONE,
 838         },
 839         {
 840                 .procname       = "fwmark_reflect",
 841                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 842                 .maxlen         = sizeof(u8),
 843                 .mode           = 0644,
 844                 .proc_handler   = proc_dou8vec_minmax,
 845         },
 846         {
 847                 .procname       = "tcp_fwmark_accept",
 848                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 849                 .maxlen         = sizeof(u8),
 850                 .mode           = 0644,
 851                 .proc_handler   = proc_dou8vec_minmax,
 852         },
 853 #ifdef CONFIG_NET_L3_MASTER_DEV
 854         {
 855                 .procname       = "tcp_l3mdev_accept",
 856                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 857                 .maxlen         = sizeof(u8),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_dou8vec_minmax,
 860                 .extra1         = SYSCTL_ZERO,
 861                 .extra2         = SYSCTL_ONE,
 862         },
 863 #endif
 864         {
 865                 .procname       = "tcp_mtu_probing",
 866                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 867                 .maxlen         = sizeof(u8),
 868                 .mode           = 0644,
 869                 .proc_handler   = proc_dou8vec_minmax,
 870         },
 871         {
 872                 .procname       = "tcp_base_mss",
 873                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 874                 .maxlen         = sizeof(int),
 875                 .mode           = 0644,
 876                 .proc_handler   = proc_dointvec,
 877         },
 878         {
 879                 .procname       = "tcp_min_snd_mss",
 880                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 881                 .maxlen         = sizeof(int),
 882                 .mode           = 0644,
 883                 .proc_handler   = proc_dointvec_minmax,
 884                 .extra1         = &tcp_min_snd_mss_min,
 885                 .extra2         = &tcp_min_snd_mss_max,
 886         },
 887         {
 888                 .procname       = "tcp_mtu_probe_floor",
 889                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 890                 .maxlen         = sizeof(int),
 891                 .mode           = 0644,
 892                 .proc_handler   = proc_dointvec_minmax,
 893                 .extra1         = &tcp_min_snd_mss_min,
 894                 .extra2         = &tcp_min_snd_mss_max,
 895         },
 896         {
 897                 .procname       = "tcp_probe_threshold",
 898                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 899                 .maxlen         = sizeof(int),
 900                 .mode           = 0644,
 901                 .proc_handler   = proc_dointvec,
 902         },
 903         {
 904                 .procname       = "tcp_probe_interval",
 905                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 906                 .maxlen         = sizeof(u32),
 907                 .mode           = 0644,
 908                 .proc_handler   = proc_douintvec_minmax,
 909                 .extra2         = &u32_max_div_HZ,
 910         },
 911         {
 912                 .procname       = "igmp_link_local_mcast_reports",
 913                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 914                 .maxlen         = sizeof(u8),
 915                 .mode           = 0644,
 916                 .proc_handler   = proc_dou8vec_minmax,
 917         },
 918         {
 919                 .procname       = "igmp_max_memberships",
 920                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 921                 .maxlen         = sizeof(int),
 922                 .mode           = 0644,
 923                 .proc_handler   = proc_dointvec
 924         },
 925         {
 926                 .procname       = "igmp_max_msf",
 927                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 928                 .maxlen         = sizeof(int),
 929                 .mode           = 0644,
 930                 .proc_handler   = proc_dointvec
 931         },
 932 #ifdef CONFIG_IP_MULTICAST
 933         {
 934                 .procname       = "igmp_qrv",
 935                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 936                 .maxlen         = sizeof(int),
 937                 .mode           = 0644,
 938                 .proc_handler   = proc_dointvec_minmax,
 939                 .extra1         = SYSCTL_ONE
 940         },
 941 #endif
 942         {
 943                 .procname       = "tcp_congestion_control",
 944                 .data           = &init_net.ipv4.tcp_congestion_control,
 945                 .mode           = 0644,
 946                 .maxlen         = TCP_CA_NAME_MAX,
 947                 .proc_handler   = proc_tcp_congestion_control,
 948         },
 949         {
 950                 .procname       = "tcp_available_congestion_control",
 951                 .maxlen         = TCP_CA_BUF_MAX,
 952                 .mode           = 0444,
 953                 .proc_handler   = proc_tcp_available_congestion_control,
 954         },
 955         {
 956                 .procname       = "tcp_allowed_congestion_control",
 957                 .maxlen         = TCP_CA_BUF_MAX,
 958                 .mode           = 0644,
 959                 .proc_handler   = proc_allowed_congestion_control,
 960         },
 961         {
 962                 .procname       = "tcp_keepalive_time",
 963                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 964                 .maxlen         = sizeof(int),
 965                 .mode           = 0644,
 966                 .proc_handler   = proc_dointvec_jiffies,
 967         },
 968         {
 969                 .procname       = "tcp_keepalive_probes",
 970                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 971                 .maxlen         = sizeof(u8),
 972                 .mode           = 0644,
 973                 .proc_handler   = proc_dou8vec_minmax,
 974         },
 975         {
 976                 .procname       = "tcp_keepalive_intvl",
 977                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 978                 .maxlen         = sizeof(int),
 979                 .mode           = 0644,
 980                 .proc_handler   = proc_dointvec_jiffies,
 981         },
 982         {
 983                 .procname       = "tcp_syn_retries",
 984                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 985                 .maxlen         = sizeof(u8),
 986                 .mode           = 0644,
 987                 .proc_handler   = proc_dou8vec_minmax,
 988                 .extra1         = &tcp_syn_retries_min,
 989                 .extra2         = &tcp_syn_retries_max
 990         },
 991         {
 992                 .procname       = "tcp_synack_retries",
 993                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 994                 .maxlen         = sizeof(u8),
 995                 .mode           = 0644,
 996                 .proc_handler   = proc_dou8vec_minmax,
 997         },
 998 #ifdef CONFIG_SYN_COOKIES
 999         {
1000                 .procname       = "tcp_syncookies",
1001                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
1002                 .maxlen         = sizeof(u8),
1003                 .mode           = 0644,
1004                 .proc_handler   = proc_dou8vec_minmax,
1005         },
1006 #endif
1007         {
1008                 .procname       = "tcp_migrate_req",
1009                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
1010                 .maxlen         = sizeof(u8),
1011                 .mode           = 0644,
1012                 .proc_handler   = proc_dou8vec_minmax,
1013                 .extra1         = SYSCTL_ZERO,
1014                 .extra2         = SYSCTL_ONE
1015         },
1016         {
1017                 .procname       = "tcp_reordering",
1018                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
1019                 .maxlen         = sizeof(int),
1020                 .mode           = 0644,
1021                 .proc_handler   = proc_dointvec
1022         },
1023         {
1024                 .procname       = "tcp_retries1",
1025                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
1026                 .maxlen         = sizeof(u8),
1027                 .mode           = 0644,
1028                 .proc_handler   = proc_dou8vec_minmax,
1029                 .extra2         = &tcp_retr1_max
1030         },
1031         {
1032                 .procname       = "tcp_retries2",
1033                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
1034                 .maxlen         = sizeof(u8),
1035                 .mode           = 0644,
1036                 .proc_handler   = proc_dou8vec_minmax,
1037         },
1038         {
1039                 .procname       = "tcp_orphan_retries",
1040                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
1041                 .maxlen         = sizeof(u8),
1042                 .mode           = 0644,
1043                 .proc_handler   = proc_dou8vec_minmax,
1044         },
1045         {
1046                 .procname       = "tcp_fin_timeout",
1047                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
1048                 .maxlen         = sizeof(int),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_dointvec_jiffies,
1051         },
1052         {
1053                 .procname       = "tcp_notsent_lowat",
1054                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1055                 .maxlen         = sizeof(unsigned int),
1056                 .mode           = 0644,
1057                 .proc_handler   = proc_douintvec,
1058         },
1059         {
1060                 .procname       = "tcp_tw_reuse",
1061                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
1062                 .maxlen         = sizeof(u8),
1063                 .mode           = 0644,
1064                 .proc_handler   = proc_dou8vec_minmax,
1065                 .extra1         = SYSCTL_ZERO,
1066                 .extra2         = SYSCTL_TWO,
1067         },
1068         {
1069                 .procname       = "tcp_max_syn_backlog",
1070                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1071                 .maxlen         = sizeof(int),
1072                 .mode           = 0644,
1073                 .proc_handler   = proc_dointvec
1074         },
1075         {
1076                 .procname       = "tcp_fastopen",
1077                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1078                 .maxlen         = sizeof(int),
1079                 .mode           = 0644,
1080                 .proc_handler   = proc_dointvec,
1081         },
1082         {
1083                 .procname       = "tcp_fastopen_key",
1084                 .mode           = 0600,
1085                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1086                 /* maxlen to print the list of keys in hex (*2), with dashes
1087                  * separating doublewords and a comma in between keys.
1088                  */
1089                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1090                                    2 * TCP_FASTOPEN_KEY_MAX) +
1091                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1092                 .proc_handler   = proc_tcp_fastopen_key,
1093         },
1094         {
1095                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1096                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1097                 .maxlen         = sizeof(int),
1098                 .mode           = 0644,
1099                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1100                 .extra1         = SYSCTL_ZERO,
1101         },
1102 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1103         {
1104                 .procname       = "fib_multipath_use_neigh",
1105                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1106                 .maxlen         = sizeof(u8),
1107                 .mode           = 0644,
1108                 .proc_handler   = proc_dou8vec_minmax,
1109                 .extra1         = SYSCTL_ZERO,
1110                 .extra2         = SYSCTL_ONE,
1111         },
1112         {
1113                 .procname       = "fib_multipath_hash_policy",
1114                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1115                 .maxlen         = sizeof(u8),
1116                 .mode           = 0644,
1117                 .proc_handler   = proc_fib_multipath_hash_policy,
1118                 .extra1         = SYSCTL_ZERO,
1119                 .extra2         = SYSCTL_THREE,
1120         },
1121         {
1122                 .procname       = "fib_multipath_hash_fields",
1123                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1124                 .maxlen         = sizeof(u32),
1125                 .mode           = 0644,
1126                 .proc_handler   = proc_fib_multipath_hash_fields,
1127                 .extra1         = SYSCTL_ONE,
1128                 .extra2         = &fib_multipath_hash_fields_all_mask,
1129         },
1130         {
1131                 .procname       = "fib_multipath_hash_seed",
1132                 .data           = &init_net,
1133                 .maxlen         = sizeof(u32),
1134                 .mode           = 0644,
1135                 .proc_handler   = proc_fib_multipath_hash_seed,
1136         },
1137 #endif
1138         {
1139                 .procname       = "ip_unprivileged_port_start",
1140                 .maxlen         = sizeof(int),
1141                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1142                 .mode           = 0644,
1143                 .proc_handler   = ipv4_privileged_ports,
1144         },
1145 #ifdef CONFIG_NET_L3_MASTER_DEV
1146         {
1147                 .procname       = "udp_l3mdev_accept",
1148                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1149                 .maxlen         = sizeof(u8),
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dou8vec_minmax,
1152                 .extra1         = SYSCTL_ZERO,
1153                 .extra2         = SYSCTL_ONE,
1154         },
1155 #endif
1156         {
1157                 .procname       = "tcp_sack",
1158                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1159                 .maxlen         = sizeof(u8),
1160                 .mode           = 0644,
1161                 .proc_handler   = proc_dou8vec_minmax,
1162         },
1163         {
1164                 .procname       = "tcp_window_scaling",
1165                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1166                 .maxlen         = sizeof(u8),
1167                 .mode           = 0644,
1168                 .proc_handler   = proc_dou8vec_minmax,
1169         },
1170         {
1171                 .procname       = "tcp_timestamps",
1172                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1173                 .maxlen         = sizeof(u8),
1174                 .mode           = 0644,
1175                 .proc_handler   = proc_dou8vec_minmax,
1176         },
1177         {
1178                 .procname       = "tcp_early_retrans",
1179                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1180                 .maxlen         = sizeof(u8),
1181                 .mode           = 0644,
1182                 .proc_handler   = proc_dou8vec_minmax,
1183                 .extra1         = SYSCTL_ZERO,
1184                 .extra2         = SYSCTL_FOUR,
1185         },
1186         {
1187                 .procname       = "tcp_recovery",
1188                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1189                 .maxlen         = sizeof(u8),
1190                 .mode           = 0644,
1191                 .proc_handler   = proc_dou8vec_minmax,
1192         },
1193         {
1194                 .procname       = "tcp_thin_linear_timeouts",
1195                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1196                 .maxlen         = sizeof(u8),
1197                 .mode           = 0644,
1198                 .proc_handler   = proc_dou8vec_minmax,
1199         },
1200         {
1201                 .procname       = "tcp_slow_start_after_idle",
1202                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1203                 .maxlen         = sizeof(u8),
1204                 .mode           = 0644,
1205                 .proc_handler   = proc_dou8vec_minmax,
1206         },
1207         {
1208                 .procname       = "tcp_retrans_collapse",
1209                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1210                 .maxlen         = sizeof(u8),
1211                 .mode           = 0644,
1212                 .proc_handler   = proc_dou8vec_minmax,
1213         },
1214         {
1215                 .procname       = "tcp_stdurg",
1216                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1217                 .maxlen         = sizeof(u8),
1218                 .mode           = 0644,
1219                 .proc_handler   = proc_dou8vec_minmax,
1220         },
1221         {
1222                 .procname       = "tcp_rfc1337",
1223                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1224                 .maxlen         = sizeof(u8),
1225                 .mode           = 0644,
1226                 .proc_handler   = proc_dou8vec_minmax,
1227         },
1228         {
1229                 .procname       = "tcp_abort_on_overflow",
1230                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1231                 .maxlen         = sizeof(u8),
1232                 .mode           = 0644,
1233                 .proc_handler   = proc_dou8vec_minmax,
1234         },
1235         {
1236                 .procname       = "tcp_fack",
1237                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1238                 .maxlen         = sizeof(u8),
1239                 .mode           = 0644,
1240                 .proc_handler   = proc_dou8vec_minmax,
1241         },
1242         {
1243                 .procname       = "tcp_max_reordering",
1244                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1245                 .maxlen         = sizeof(int),
1246                 .mode           = 0644,
1247                 .proc_handler   = proc_dointvec
1248         },
1249         {
1250                 .procname       = "tcp_dsack",
1251                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1252                 .maxlen         = sizeof(u8),
1253                 .mode           = 0644,
1254                 .proc_handler   = proc_dou8vec_minmax,
1255         },
1256         {
1257                 .procname       = "tcp_app_win",
1258                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1259                 .maxlen         = sizeof(u8),
1260                 .mode           = 0644,
1261                 .proc_handler   = proc_dou8vec_minmax,
1262                 .extra1         = SYSCTL_ZERO,
1263                 .extra2         = &tcp_app_win_max,
1264         },
1265         {
1266                 .procname       = "tcp_adv_win_scale",
1267                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1268                 .maxlen         = sizeof(int),
1269                 .mode           = 0644,
1270                 .proc_handler   = proc_dointvec_minmax,
1271                 .extra1         = &tcp_adv_win_scale_min,
1272                 .extra2         = &tcp_adv_win_scale_max,
1273         },
1274         {
1275                 .procname       = "tcp_frto",
1276                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1277                 .maxlen         = sizeof(u8),
1278                 .mode           = 0644,
1279                 .proc_handler   = proc_dou8vec_minmax,
1280         },
1281         {
1282                 .procname       = "tcp_no_metrics_save",
1283                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1284                 .maxlen         = sizeof(u8),
1285                 .mode           = 0644,
1286                 .proc_handler   = proc_dou8vec_minmax,
1287         },
1288         {
1289                 .procname       = "tcp_no_ssthresh_metrics_save",
1290                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1291                 .maxlen         = sizeof(u8),
1292                 .mode           = 0644,
1293                 .proc_handler   = proc_dou8vec_minmax,
1294                 .extra1         = SYSCTL_ZERO,
1295                 .extra2         = SYSCTL_ONE,
1296         },
1297         {
1298                 .procname       = "tcp_moderate_rcvbuf",
1299                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1300                 .maxlen         = sizeof(u8),
1301                 .mode           = 0644,
1302                 .proc_handler   = proc_dou8vec_minmax,
1303         },
1304         {
1305                 .procname       = "tcp_tso_win_divisor",
1306                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1307                 .maxlen         = sizeof(u8),
1308                 .mode           = 0644,
1309                 .proc_handler   = proc_dou8vec_minmax,
1310         },
1311         {
1312                 .procname       = "tcp_workaround_signed_windows",
1313                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1314                 .maxlen         = sizeof(u8),
1315                 .mode           = 0644,
1316                 .proc_handler   = proc_dou8vec_minmax,
1317         },
1318         {
1319                 .procname       = "tcp_limit_output_bytes",
1320                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1321                 .maxlen         = sizeof(int),
1322                 .mode           = 0644,
1323                 .proc_handler   = proc_dointvec
1324         },
1325         {
1326                 .procname       = "tcp_challenge_ack_limit",
1327                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1328                 .maxlen         = sizeof(int),
1329                 .mode           = 0644,
1330                 .proc_handler   = proc_dointvec
1331         },
1332         {
1333                 .procname       = "tcp_min_tso_segs",
1334                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1335                 .maxlen         = sizeof(u8),
1336                 .mode           = 0644,
1337                 .proc_handler   = proc_dou8vec_minmax,
1338                 .extra1         = SYSCTL_ONE,
1339         },
1340         {
1341                 .procname       = "tcp_tso_rtt_log",
1342                 .data           = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1343                 .maxlen         = sizeof(u8),
1344                 .mode           = 0644,
1345                 .proc_handler   = proc_dou8vec_minmax,
1346         },
1347         {
1348                 .procname       = "tcp_min_rtt_wlen",
1349                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1350                 .maxlen         = sizeof(int),
1351                 .mode           = 0644,
1352                 .proc_handler   = proc_dointvec_minmax,
1353                 .extra1         = SYSCTL_ZERO,
1354                 .extra2         = &one_day_secs
1355         },
1356         {
1357                 .procname       = "tcp_autocorking",
1358                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1359                 .maxlen         = sizeof(u8),
1360                 .mode           = 0644,
1361                 .proc_handler   = proc_dou8vec_minmax,
1362                 .extra1         = SYSCTL_ZERO,
1363                 .extra2         = SYSCTL_ONE,
1364         },
1365         {
1366                 .procname       = "tcp_invalid_ratelimit",
1367                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1368                 .maxlen         = sizeof(int),
1369                 .mode           = 0644,
1370                 .proc_handler   = proc_dointvec_ms_jiffies,
1371         },
1372         {
1373                 .procname       = "tcp_pacing_ss_ratio",
1374                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1375                 .maxlen         = sizeof(int),
1376                 .mode           = 0644,
1377                 .proc_handler   = proc_dointvec_minmax,
1378                 .extra1         = SYSCTL_ZERO,
1379                 .extra2         = SYSCTL_ONE_THOUSAND,
1380         },
1381         {
1382                 .procname       = "tcp_pacing_ca_ratio",
1383                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1384                 .maxlen         = sizeof(int),
1385                 .mode           = 0644,
1386                 .proc_handler   = proc_dointvec_minmax,
1387                 .extra1         = SYSCTL_ZERO,
1388                 .extra2         = SYSCTL_ONE_THOUSAND,
1389         },
1390         {
1391                 .procname       = "tcp_wmem",
1392                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1393                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1394                 .mode           = 0644,
1395                 .proc_handler   = proc_dointvec_minmax,
1396                 .extra1         = SYSCTL_ONE,
1397         },
1398         {
1399                 .procname       = "tcp_rmem",
1400                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1401                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1402                 .mode           = 0644,
1403                 .proc_handler   = proc_dointvec_minmax,
1404                 .extra1         = SYSCTL_ONE,
1405         },
1406         {
1407                 .procname       = "tcp_comp_sack_delay_ns",
1408                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1409                 .maxlen         = sizeof(unsigned long),
1410                 .mode           = 0644,
1411                 .proc_handler   = proc_doulongvec_minmax,
1412         },
1413         {
1414                 .procname       = "tcp_comp_sack_slack_ns",
1415                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1416                 .maxlen         = sizeof(unsigned long),
1417                 .mode           = 0644,
1418                 .proc_handler   = proc_doulongvec_minmax,
1419         },
1420         {
1421                 .procname       = "tcp_comp_sack_nr",
1422                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1423                 .maxlen         = sizeof(u8),
1424                 .mode           = 0644,
1425                 .proc_handler   = proc_dou8vec_minmax,
1426                 .extra1         = SYSCTL_ZERO,
1427         },
1428         {
1429                 .procname       = "tcp_backlog_ack_defer",
1430                 .data           = &init_net.ipv4.sysctl_tcp_backlog_ack_defer,
1431                 .maxlen         = sizeof(u8),
1432                 .mode           = 0644,
1433                 .proc_handler   = proc_dou8vec_minmax,
1434                 .extra1         = SYSCTL_ZERO,
1435                 .extra2         = SYSCTL_ONE,
1436         },
1437         {
1438                 .procname       = "tcp_reflect_tos",
1439                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1440                 .maxlen         = sizeof(u8),
1441                 .mode           = 0644,
1442                 .proc_handler   = proc_dou8vec_minmax,
1443                 .extra1         = SYSCTL_ZERO,
1444                 .extra2         = SYSCTL_ONE,
1445         },
1446         {
1447                 .procname       = "tcp_ehash_entries",
1448                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1449                 .mode           = 0444,
1450                 .proc_handler   = proc_tcp_ehash_entries,
1451         },
1452         {
1453                 .procname       = "tcp_child_ehash_entries",
1454                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1455                 .maxlen         = sizeof(unsigned int),
1456                 .mode           = 0644,
1457                 .proc_handler   = proc_douintvec_minmax,
1458                 .extra1         = SYSCTL_ZERO,
1459                 .extra2         = &tcp_child_ehash_entries_max,
1460         },
1461         {
1462                 .procname       = "udp_hash_entries",
1463                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1464                 .mode           = 0444,
1465                 .proc_handler   = proc_udp_hash_entries,
1466         },
1467         {
1468                 .procname       = "udp_child_hash_entries",
1469                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1470                 .maxlen         = sizeof(unsigned int),
1471                 .mode           = 0644,
1472                 .proc_handler   = proc_douintvec_minmax,
1473                 .extra1         = SYSCTL_ZERO,
1474                 .extra2         = &udp_child_hash_entries_max,
1475         },
1476         {
1477                 .procname       = "udp_rmem_min",
1478                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1479                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1480                 .mode           = 0644,
1481                 .proc_handler   = proc_dointvec_minmax,
1482                 .extra1         = SYSCTL_ONE
1483         },
1484         {
1485                 .procname       = "udp_wmem_min",
1486                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1487                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1488                 .mode           = 0644,
1489                 .proc_handler   = proc_dointvec_minmax,
1490                 .extra1         = SYSCTL_ONE
1491         },
1492         {
1493                 .procname       = "fib_notify_on_flag_change",
1494                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1495                 .maxlen         = sizeof(u8),
1496                 .mode           = 0644,
1497                 .proc_handler   = proc_dou8vec_minmax,
1498                 .extra1         = SYSCTL_ZERO,
1499                 .extra2         = SYSCTL_TWO,
1500         },
1501         {
1502                 .procname       = "tcp_plb_enabled",
1503                 .data           = &init_net.ipv4.sysctl_tcp_plb_enabled,
1504                 .maxlen         = sizeof(u8),
1505                 .mode           = 0644,
1506                 .proc_handler   = proc_dou8vec_minmax,
1507                 .extra1         = SYSCTL_ZERO,
1508                 .extra2         = SYSCTL_ONE,
1509         },
1510         {
1511                 .procname       = "tcp_plb_idle_rehash_rounds",
1512                 .data           = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds,
1513                 .maxlen         = sizeof(u8),
1514                 .mode           = 0644,
1515                 .proc_handler   = proc_dou8vec_minmax,
1516                 .extra2         = &tcp_plb_max_rounds,
1517         },
1518         {
1519                 .procname       = "tcp_plb_rehash_rounds",
1520                 .data           = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds,
1521                 .maxlen         = sizeof(u8),
1522                 .mode           = 0644,
1523                 .proc_handler   = proc_dou8vec_minmax,
1524                 .extra2         = &tcp_plb_max_rounds,
1525         },
1526         {
1527                 .procname       = "tcp_plb_suspend_rto_sec",
1528                 .data           = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec,
1529                 .maxlen         = sizeof(u8),
1530                 .mode           = 0644,
1531                 .proc_handler   = proc_dou8vec_minmax,
1532         },
1533         {
1534                 .procname       = "tcp_plb_cong_thresh",
1535                 .data           = &init_net.ipv4.sysctl_tcp_plb_cong_thresh,
1536                 .maxlen         = sizeof(int),
1537                 .mode           = 0644,
1538                 .proc_handler   = proc_dointvec_minmax,
1539                 .extra1         = SYSCTL_ZERO,
1540                 .extra2         = &tcp_plb_max_cong_thresh,
1541         },
1542         {
1543                 .procname       = "tcp_syn_linear_timeouts",
1544                 .data           = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts,
1545                 .maxlen         = sizeof(u8),
1546                 .mode           = 0644,
1547                 .proc_handler   = proc_dou8vec_minmax,
1548                 .extra1         = SYSCTL_ZERO,
1549                 .extra2         = &tcp_syn_linear_timeouts_max,
1550         },
1551         {
1552                 .procname       = "tcp_shrink_window",
1553                 .data           = &init_net.ipv4.sysctl_tcp_shrink_window,
1554                 .maxlen         = sizeof(u8),
1555                 .mode           = 0644,
1556                 .proc_handler   = proc_dou8vec_minmax,
1557                 .extra1         = SYSCTL_ZERO,
1558                 .extra2         = SYSCTL_ONE,
1559         },
1560         {
1561                 .procname       = "tcp_pingpong_thresh",
1562                 .data           = &init_net.ipv4.sysctl_tcp_pingpong_thresh,
1563                 .maxlen         = sizeof(u8),
1564                 .mode           = 0644,
1565                 .proc_handler   = proc_dou8vec_minmax,
1566                 .extra1         = SYSCTL_ONE,
1567         },
1568         {
1569                 .procname       = "tcp_rto_min_us",
1570                 .data           = &init_net.ipv4.sysctl_tcp_rto_min_us,
1571                 .maxlen         = sizeof(int),
1572                 .mode           = 0644,
1573                 .proc_handler   = proc_dointvec_minmax,
1574                 .extra1         = SYSCTL_ONE,
1575         },
1576 };
1577
1578 static __net_init int ipv4_sysctl_init_net(struct net *net)
1579 {
1580         size_t table_size = ARRAY_SIZE(ipv4_net_table);
1581         struct ctl_table *table;
1582
1583         table = ipv4_net_table;
1584         if (!net_eq(net, &init_net)) {
1585                 int i;
1586
1587                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1588                 if (!table)
1589                         goto err_alloc;
1590
1591                 for (i = 0; i < table_size; i++) {
1592                         if (table[i].data) {
1593                                 /* Update the variables to point into
1594                                  * the current struct net
1595                                  */
1596                                 table[i].data += (void *)net - (void *)&init_net;
1597                         } else {
1598                                 /* Entries without data pointer are global;
1599                                  * Make them read-only in non-init_net ns
1600                                  */
1601                                 table[i].mode &= ~0222;
1602                         }
1603                 }
1604         }
1605
1606         net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table,
1607                                                     table_size);
1608         if (!net->ipv4.ipv4_hdr)
1609                 goto err_reg;
1610
1611         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1612         if (!net->ipv4.sysctl_local_reserved_ports)
1613                 goto err_ports;
1614
1615         proc_fib_multipath_hash_set_seed(net, 0);
1616
1617         return 0;
1618
1619 err_ports:
1620         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1621 err_reg:
1622         if (!net_eq(net, &init_net))
1623                 kfree(table);
1624 err_alloc:
1625         return -ENOMEM;
1626 }
1627
1628 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1629 {
1630         const struct ctl_table *table;
1631
1632         kfree(net->ipv4.sysctl_local_reserved_ports);
1633         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1634         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1635         kfree(table);
1636 }
1637
1638 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1639         .init = ipv4_sysctl_init_net,
1640         .exit = ipv4_sysctl_exit_net,
1641 };
1642
1643 static __init int sysctl_ipv4_init(void)
1644 {
1645         struct ctl_table_header *hdr;
1646
1647         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1648         if (!hdr)
1649                 return -ENOMEM;
1650
1651         proc_fib_multipath_hash_init_rand_seed();
1652
1653         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1654                 unregister_net_sysctl_table(hdr);
1655                 return -ENOMEM;
1656         }
1657
1658         return 0;
1659 }
1660
1661 __initcall(sysctl_ipv4_init);