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 static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX;
  44 static int tcp_plb_max_rounds = 31;
  45 static int tcp_plb_max_cong_thresh = 256;
  46
  47 /* obsolete */
  48 static int sysctl_tcp_low_latency __read_mostly;
  49
  50 /* Update system visible IP port range */
  51 static void set_local_port_range(struct net *net, int range[2])
  52 {
  53         bool same_parity = !((range[0] ^ range[1]) & 1);
  54
  55         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  56         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  57                 net->ipv4.ip_local_ports.warned = true;
  58                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  59         }
  60         net->ipv4.ip_local_ports.range[0] = range[0];
  61         net->ipv4.ip_local_ports.range[1] = range[1];
  62         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  63 }
  64
  65 /* Validate changes from /proc interface. */
  66 static int ipv4_local_port_range(struct ctl_table *table, int write,
  67                                  void *buffer, size_t *lenp, loff_t *ppos)
  68 {
  69         struct net *net =
  70                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  71         int ret;
  72         int range[2];
  73         struct ctl_table tmp = {
  74                 .data = &range,
  75                 .maxlen = sizeof(range),
  76                 .mode = table->mode,
  77                 .extra1 = &ip_local_port_range_min,
  78                 .extra2 = &ip_local_port_range_max,
  79         };
  80
  81         inet_get_local_port_range(net, &range[0], &range[1]);
  82
  83         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  84
  85         if (write && ret == 0) {
  86                 /* Ensure that the upper limit is not smaller than the lower,
  87                  * and that the lower does not encroach upon the privileged
  88                  * port limit.
  89                  */
  90                 if ((range[1] < range[0]) ||
  91                     (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
  92                         ret = -EINVAL;
  93                 else
  94                         set_local_port_range(net, range);
  95         }
  96
  97         return ret;
  98 }
  99
 100 /* Validate changes from /proc interface. */
 101 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 102                                 void *buffer, size_t *lenp, loff_t *ppos)
 103 {
 104         struct net *net = container_of(table->data, struct net,
 105             ipv4.sysctl_ip_prot_sock);
 106         int ret;
 107         int pports;
 108         int range[2];
 109         struct ctl_table tmp = {
 110                 .data = &pports,
 111                 .maxlen = sizeof(pports),
 112                 .mode = table->mode,
 113                 .extra1 = &ip_privileged_port_min,
 114                 .extra2 = &ip_privileged_port_max,
 115         };
 116
 117         pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
 118
 119         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 120
 121         if (write && ret == 0) {
 122                 inet_get_local_port_range(net, &range[0], &range[1]);
 123                 /* Ensure that the local port range doesn't overlap with the
 124                  * privileged port range.
 125                  */
 126                 if (range[0] < pports)
 127                         ret = -EINVAL;
 128                 else
 129                         WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
 130         }
 131
 132         return ret;
 133 }
 134
 135 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 136 {
 137         kgid_t *data = table->data;
 138         struct net *net =
 139                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 140         unsigned int seq;
 141         do {
 142                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 143
 144                 *low = data[0];
 145                 *high = data[1];
 146         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 147 }
 148
 149 /* Update system visible IP port range */
 150 static void set_ping_group_range(struct ctl_table *table, 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(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         gid_t 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_dointvec_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(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(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(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(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(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(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(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(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(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(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(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 #endif
 468
 469 static struct ctl_table ipv4_table[] = {
 470         {
 471                 .procname       = "tcp_max_orphans",
 472                 .data           = &sysctl_tcp_max_orphans,
 473                 .maxlen         = sizeof(int),
 474                 .mode           = 0644,
 475                 .proc_handler   = proc_dointvec
 476         },
 477         {
 478                 .procname       = "inet_peer_threshold",
 479                 .data           = &inet_peer_threshold,
 480                 .maxlen         = sizeof(int),
 481                 .mode           = 0644,
 482                 .proc_handler   = proc_dointvec
 483         },
 484         {
 485                 .procname       = "inet_peer_minttl",
 486                 .data           = &inet_peer_minttl,
 487                 .maxlen         = sizeof(int),
 488                 .mode           = 0644,
 489                 .proc_handler   = proc_dointvec_jiffies,
 490         },
 491         {
 492                 .procname       = "inet_peer_maxttl",
 493                 .data           = &inet_peer_maxttl,
 494                 .maxlen         = sizeof(int),
 495                 .mode           = 0644,
 496                 .proc_handler   = proc_dointvec_jiffies,
 497         },
 498         {
 499                 .procname       = "tcp_mem",
 500                 .maxlen         = sizeof(sysctl_tcp_mem),
 501                 .data           = &sysctl_tcp_mem,
 502                 .mode           = 0644,
 503                 .proc_handler   = proc_doulongvec_minmax,
 504         },
 505         {
 506                 .procname       = "tcp_low_latency",
 507                 .data           = &sysctl_tcp_low_latency,
 508                 .maxlen         = sizeof(int),
 509                 .mode           = 0644,
 510                 .proc_handler   = proc_dointvec
 511         },
 512 #ifdef CONFIG_NETLABEL
 513         {
 514                 .procname       = "cipso_cache_enable",
 515                 .data           = &cipso_v4_cache_enabled,
 516                 .maxlen         = sizeof(int),
 517                 .mode           = 0644,
 518                 .proc_handler   = proc_dointvec,
 519         },
 520         {
 521                 .procname       = "cipso_cache_bucket_size",
 522                 .data           = &cipso_v4_cache_bucketsize,
 523                 .maxlen         = sizeof(int),
 524                 .mode           = 0644,
 525                 .proc_handler   = proc_dointvec,
 526         },
 527         {
 528                 .procname       = "cipso_rbm_optfmt",
 529                 .data           = &cipso_v4_rbm_optfmt,
 530                 .maxlen         = sizeof(int),
 531                 .mode           = 0644,
 532                 .proc_handler   = proc_dointvec,
 533         },
 534         {
 535                 .procname       = "cipso_rbm_strictvalid",
 536                 .data           = &cipso_v4_rbm_strictvalid,
 537                 .maxlen         = sizeof(int),
 538                 .mode           = 0644,
 539                 .proc_handler   = proc_dointvec,
 540         },
 541 #endif /* CONFIG_NETLABEL */
 542         {
 543                 .procname       = "tcp_available_ulp",
 544                 .maxlen         = TCP_ULP_BUF_MAX,
 545                 .mode           = 0444,
 546                 .proc_handler   = proc_tcp_available_ulp,
 547         },
 548         {
 549                 .procname       = "icmp_msgs_per_sec",
 550                 .data           = &sysctl_icmp_msgs_per_sec,
 551                 .maxlen         = sizeof(int),
 552                 .mode           = 0644,
 553                 .proc_handler   = proc_dointvec_minmax,
 554                 .extra1         = SYSCTL_ZERO,
 555         },
 556         {
 557                 .procname       = "icmp_msgs_burst",
 558                 .data           = &sysctl_icmp_msgs_burst,
 559                 .maxlen         = sizeof(int),
 560                 .mode           = 0644,
 561                 .proc_handler   = proc_dointvec_minmax,
 562                 .extra1         = SYSCTL_ZERO,
 563         },
 564         {
 565                 .procname       = "udp_mem",
 566                 .data           = &sysctl_udp_mem,
 567                 .maxlen         = sizeof(sysctl_udp_mem),
 568                 .mode           = 0644,
 569                 .proc_handler   = proc_doulongvec_minmax,
 570         },
 571         {
 572                 .procname       = "fib_sync_mem",
 573                 .data           = &sysctl_fib_sync_mem,
 574                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 575                 .mode           = 0644,
 576                 .proc_handler   = proc_douintvec_minmax,
 577                 .extra1         = &sysctl_fib_sync_mem_min,
 578                 .extra2         = &sysctl_fib_sync_mem_max,
 579         },
 580         { }
 581 };
 582
 583 static struct ctl_table ipv4_net_table[] = {
 584         {
 585                 .procname       = "tcp_max_tw_buckets",
 586                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 587                 .maxlen         = sizeof(int),
 588                 .mode           = 0644,
 589                 .proc_handler   = proc_dointvec
 590         },
 591         {
 592                 .procname       = "icmp_echo_ignore_all",
 593                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 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_echo_enable_probe",
 602                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 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_echo_ignore_broadcasts",
 611                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 612                 .maxlen         = sizeof(u8),
 613                 .mode           = 0644,
 614                 .proc_handler   = proc_dou8vec_minmax,
 615                 .extra1         = SYSCTL_ZERO,
 616                 .extra2         = SYSCTL_ONE
 617         },
 618         {
 619                 .procname       = "icmp_ignore_bogus_error_responses",
 620                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 621                 .maxlen         = sizeof(u8),
 622                 .mode           = 0644,
 623                 .proc_handler   = proc_dou8vec_minmax,
 624                 .extra1         = SYSCTL_ZERO,
 625                 .extra2         = SYSCTL_ONE
 626         },
 627         {
 628                 .procname       = "icmp_errors_use_inbound_ifaddr",
 629                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 630                 .maxlen         = sizeof(u8),
 631                 .mode           = 0644,
 632                 .proc_handler   = proc_dou8vec_minmax,
 633                 .extra1         = SYSCTL_ZERO,
 634                 .extra2         = SYSCTL_ONE
 635         },
 636         {
 637                 .procname       = "icmp_ratelimit",
 638                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 639                 .maxlen         = sizeof(int),
 640                 .mode           = 0644,
 641                 .proc_handler   = proc_dointvec_ms_jiffies,
 642         },
 643         {
 644                 .procname       = "icmp_ratemask",
 645                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 646                 .maxlen         = sizeof(int),
 647                 .mode           = 0644,
 648                 .proc_handler   = proc_dointvec
 649         },
 650         {
 651                 .procname       = "ping_group_range",
 652                 .data           = &init_net.ipv4.ping_group_range.range,
 653                 .maxlen         = sizeof(gid_t)*2,
 654                 .mode           = 0644,
 655                 .proc_handler   = ipv4_ping_group_range,
 656         },
 657 #ifdef CONFIG_NET_L3_MASTER_DEV
 658         {
 659                 .procname       = "raw_l3mdev_accept",
 660                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 661                 .maxlen         = sizeof(u8),
 662                 .mode           = 0644,
 663                 .proc_handler   = proc_dou8vec_minmax,
 664                 .extra1         = SYSCTL_ZERO,
 665                 .extra2         = SYSCTL_ONE,
 666         },
 667 #endif
 668         {
 669                 .procname       = "tcp_ecn",
 670                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 671                 .maxlen         = sizeof(u8),
 672                 .mode           = 0644,
 673                 .proc_handler   = proc_dou8vec_minmax,
 674                 .extra1         = SYSCTL_ZERO,
 675                 .extra2         = SYSCTL_TWO,
 676         },
 677         {
 678                 .procname       = "tcp_ecn_fallback",
 679                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 680                 .maxlen         = sizeof(u8),
 681                 .mode           = 0644,
 682                 .proc_handler   = proc_dou8vec_minmax,
 683                 .extra1         = SYSCTL_ZERO,
 684                 .extra2         = SYSCTL_ONE,
 685         },
 686         {
 687                 .procname       = "ip_dynaddr",
 688                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 689                 .maxlen         = sizeof(u8),
 690                 .mode           = 0644,
 691                 .proc_handler   = proc_dou8vec_minmax,
 692         },
 693         {
 694                 .procname       = "ip_early_demux",
 695                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 696                 .maxlen         = sizeof(u8),
 697                 .mode           = 0644,
 698                 .proc_handler   = proc_dou8vec_minmax,
 699         },
 700         {
 701                 .procname       = "udp_early_demux",
 702                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 703                 .maxlen         = sizeof(u8),
 704                 .mode           = 0644,
 705                 .proc_handler   = proc_dou8vec_minmax,
 706         },
 707         {
 708                 .procname       = "tcp_early_demux",
 709                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 710                 .maxlen         = sizeof(u8),
 711                 .mode           = 0644,
 712                 .proc_handler   = proc_dou8vec_minmax,
 713         },
 714         {
 715                 .procname       = "nexthop_compat_mode",
 716                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 717                 .maxlen         = sizeof(u8),
 718                 .mode           = 0644,
 719                 .proc_handler   = proc_dou8vec_minmax,
 720                 .extra1         = SYSCTL_ZERO,
 721                 .extra2         = SYSCTL_ONE,
 722         },
 723         {
 724                 .procname       = "ip_default_ttl",
 725                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 726                 .maxlen         = sizeof(u8),
 727                 .mode           = 0644,
 728                 .proc_handler   = proc_dou8vec_minmax,
 729                 .extra1         = &ip_ttl_min,
 730                 .extra2         = &ip_ttl_max,
 731         },
 732         {
 733                 .procname       = "ip_local_port_range",
 734                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 735                 .data           = &init_net.ipv4.ip_local_ports.range,
 736                 .mode           = 0644,
 737                 .proc_handler   = ipv4_local_port_range,
 738         },
 739         {
 740                 .procname       = "ip_local_reserved_ports",
 741                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 742                 .maxlen         = 65536,
 743                 .mode           = 0644,
 744                 .proc_handler   = proc_do_large_bitmap,
 745         },
 746         {
 747                 .procname       = "ip_no_pmtu_disc",
 748                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 749                 .maxlen         = sizeof(u8),
 750                 .mode           = 0644,
 751                 .proc_handler   = proc_dou8vec_minmax,
 752         },
 753         {
 754                 .procname       = "ip_forward_use_pmtu",
 755                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 756                 .maxlen         = sizeof(u8),
 757                 .mode           = 0644,
 758                 .proc_handler   = proc_dou8vec_minmax,
 759         },
 760         {
 761                 .procname       = "ip_forward_update_priority",
 762                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 763                 .maxlen         = sizeof(u8),
 764                 .mode           = 0644,
 765                 .proc_handler   = ipv4_fwd_update_priority,
 766                 .extra1         = SYSCTL_ZERO,
 767                 .extra2         = SYSCTL_ONE,
 768         },
 769         {
 770                 .procname       = "ip_nonlocal_bind",
 771                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 772                 .maxlen         = sizeof(u8),
 773                 .mode           = 0644,
 774                 .proc_handler   = proc_dou8vec_minmax,
 775         },
 776         {
 777                 .procname       = "ip_autobind_reuse",
 778                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 779                 .maxlen         = sizeof(u8),
 780                 .mode           = 0644,
 781                 .proc_handler   = proc_dou8vec_minmax,
 782                 .extra1         = SYSCTL_ZERO,
 783                 .extra2         = SYSCTL_ONE,
 784         },
 785         {
 786                 .procname       = "fwmark_reflect",
 787                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 788                 .maxlen         = sizeof(u8),
 789                 .mode           = 0644,
 790                 .proc_handler   = proc_dou8vec_minmax,
 791         },
 792         {
 793                 .procname       = "tcp_fwmark_accept",
 794                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 795                 .maxlen         = sizeof(u8),
 796                 .mode           = 0644,
 797                 .proc_handler   = proc_dou8vec_minmax,
 798         },
 799 #ifdef CONFIG_NET_L3_MASTER_DEV
 800         {
 801                 .procname       = "tcp_l3mdev_accept",
 802                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 803                 .maxlen         = sizeof(u8),
 804                 .mode           = 0644,
 805                 .proc_handler   = proc_dou8vec_minmax,
 806                 .extra1         = SYSCTL_ZERO,
 807                 .extra2         = SYSCTL_ONE,
 808         },
 809 #endif
 810         {
 811                 .procname       = "tcp_mtu_probing",
 812                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 813                 .maxlen         = sizeof(u8),
 814                 .mode           = 0644,
 815                 .proc_handler   = proc_dou8vec_minmax,
 816         },
 817         {
 818                 .procname       = "tcp_base_mss",
 819                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 820                 .maxlen         = sizeof(int),
 821                 .mode           = 0644,
 822                 .proc_handler   = proc_dointvec,
 823         },
 824         {
 825                 .procname       = "tcp_min_snd_mss",
 826                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = proc_dointvec_minmax,
 830                 .extra1         = &tcp_min_snd_mss_min,
 831                 .extra2         = &tcp_min_snd_mss_max,
 832         },
 833         {
 834                 .procname       = "tcp_mtu_probe_floor",
 835                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 836                 .maxlen         = sizeof(int),
 837                 .mode           = 0644,
 838                 .proc_handler   = proc_dointvec_minmax,
 839                 .extra1         = &tcp_min_snd_mss_min,
 840                 .extra2         = &tcp_min_snd_mss_max,
 841         },
 842         {
 843                 .procname       = "tcp_probe_threshold",
 844                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 845                 .maxlen         = sizeof(int),
 846                 .mode           = 0644,
 847                 .proc_handler   = proc_dointvec,
 848         },
 849         {
 850                 .procname       = "tcp_probe_interval",
 851                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 852                 .maxlen         = sizeof(u32),
 853                 .mode           = 0644,
 854                 .proc_handler   = proc_douintvec_minmax,
 855                 .extra2         = &u32_max_div_HZ,
 856         },
 857         {
 858                 .procname       = "igmp_link_local_mcast_reports",
 859                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 860                 .maxlen         = sizeof(u8),
 861                 .mode           = 0644,
 862                 .proc_handler   = proc_dou8vec_minmax,
 863         },
 864         {
 865                 .procname       = "igmp_max_memberships",
 866                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 867                 .maxlen         = sizeof(int),
 868                 .mode           = 0644,
 869                 .proc_handler   = proc_dointvec
 870         },
 871         {
 872                 .procname       = "igmp_max_msf",
 873                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 874                 .maxlen         = sizeof(int),
 875                 .mode           = 0644,
 876                 .proc_handler   = proc_dointvec
 877         },
 878 #ifdef CONFIG_IP_MULTICAST
 879         {
 880                 .procname       = "igmp_qrv",
 881                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 882                 .maxlen         = sizeof(int),
 883                 .mode           = 0644,
 884                 .proc_handler   = proc_dointvec_minmax,
 885                 .extra1         = SYSCTL_ONE
 886         },
 887 #endif
 888         {
 889                 .procname       = "tcp_congestion_control",
 890                 .data           = &init_net.ipv4.tcp_congestion_control,
 891                 .mode           = 0644,
 892                 .maxlen         = TCP_CA_NAME_MAX,
 893                 .proc_handler   = proc_tcp_congestion_control,
 894         },
 895         {
 896                 .procname       = "tcp_available_congestion_control",
 897                 .maxlen         = TCP_CA_BUF_MAX,
 898                 .mode           = 0444,
 899                 .proc_handler   = proc_tcp_available_congestion_control,
 900         },
 901         {
 902                 .procname       = "tcp_allowed_congestion_control",
 903                 .maxlen         = TCP_CA_BUF_MAX,
 904                 .mode           = 0644,
 905                 .proc_handler   = proc_allowed_congestion_control,
 906         },
 907         {
 908                 .procname       = "tcp_keepalive_time",
 909                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 910                 .maxlen         = sizeof(int),
 911                 .mode           = 0644,
 912                 .proc_handler   = proc_dointvec_jiffies,
 913         },
 914         {
 915                 .procname       = "tcp_keepalive_probes",
 916                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 917                 .maxlen         = sizeof(u8),
 918                 .mode           = 0644,
 919                 .proc_handler   = proc_dou8vec_minmax,
 920         },
 921         {
 922                 .procname       = "tcp_keepalive_intvl",
 923                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 924                 .maxlen         = sizeof(int),
 925                 .mode           = 0644,
 926                 .proc_handler   = proc_dointvec_jiffies,
 927         },
 928         {
 929                 .procname       = "tcp_syn_retries",
 930                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 931                 .maxlen         = sizeof(u8),
 932                 .mode           = 0644,
 933                 .proc_handler   = proc_dou8vec_minmax,
 934                 .extra1         = &tcp_syn_retries_min,
 935                 .extra2         = &tcp_syn_retries_max
 936         },
 937         {
 938                 .procname       = "tcp_synack_retries",
 939                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 940                 .maxlen         = sizeof(u8),
 941                 .mode           = 0644,
 942                 .proc_handler   = proc_dou8vec_minmax,
 943         },
 944 #ifdef CONFIG_SYN_COOKIES
 945         {
 946                 .procname       = "tcp_syncookies",
 947                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 948                 .maxlen         = sizeof(u8),
 949                 .mode           = 0644,
 950                 .proc_handler   = proc_dou8vec_minmax,
 951         },
 952 #endif
 953         {
 954                 .procname       = "tcp_migrate_req",
 955                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 956                 .maxlen         = sizeof(u8),
 957                 .mode           = 0644,
 958                 .proc_handler   = proc_dou8vec_minmax,
 959                 .extra1         = SYSCTL_ZERO,
 960                 .extra2         = SYSCTL_ONE
 961         },
 962         {
 963                 .procname       = "tcp_reordering",
 964                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 965                 .maxlen         = sizeof(int),
 966                 .mode           = 0644,
 967                 .proc_handler   = proc_dointvec
 968         },
 969         {
 970                 .procname       = "tcp_retries1",
 971                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 972                 .maxlen         = sizeof(u8),
 973                 .mode           = 0644,
 974                 .proc_handler   = proc_dou8vec_minmax,
 975                 .extra2         = &tcp_retr1_max
 976         },
 977         {
 978                 .procname       = "tcp_retries2",
 979                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 980                 .maxlen         = sizeof(u8),
 981                 .mode           = 0644,
 982                 .proc_handler   = proc_dou8vec_minmax,
 983         },
 984         {
 985                 .procname       = "tcp_orphan_retries",
 986                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 987                 .maxlen         = sizeof(u8),
 988                 .mode           = 0644,
 989                 .proc_handler   = proc_dou8vec_minmax,
 990         },
 991         {
 992                 .procname       = "tcp_fin_timeout",
 993                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 994                 .maxlen         = sizeof(int),
 995                 .mode           = 0644,
 996                 .proc_handler   = proc_dointvec_jiffies,
 997         },
 998         {
 999                 .procname       = "tcp_notsent_lowat",
1000                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1001                 .maxlen         = sizeof(unsigned int),
1002                 .mode           = 0644,
1003                 .proc_handler   = proc_douintvec,
1004         },
1005         {
1006                 .procname       = "tcp_tw_reuse",
1007                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
1008                 .maxlen         = sizeof(u8),
1009                 .mode           = 0644,
1010                 .proc_handler   = proc_dou8vec_minmax,
1011                 .extra1         = SYSCTL_ZERO,
1012                 .extra2         = SYSCTL_TWO,
1013         },
1014         {
1015                 .procname       = "tcp_max_syn_backlog",
1016                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1017                 .maxlen         = sizeof(int),
1018                 .mode           = 0644,
1019                 .proc_handler   = proc_dointvec
1020         },
1021         {
1022                 .procname       = "tcp_fastopen",
1023                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1024                 .maxlen         = sizeof(int),
1025                 .mode           = 0644,
1026                 .proc_handler   = proc_dointvec,
1027         },
1028         {
1029                 .procname       = "tcp_fastopen_key",
1030                 .mode           = 0600,
1031                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1032                 /* maxlen to print the list of keys in hex (*2), with dashes
1033                  * separating doublewords and a comma in between keys.
1034                  */
1035                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1036                                    2 * TCP_FASTOPEN_KEY_MAX) +
1037                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1038                 .proc_handler   = proc_tcp_fastopen_key,
1039         },
1040         {
1041                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1042                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1043                 .maxlen         = sizeof(int),
1044                 .mode           = 0644,
1045                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1046                 .extra1         = SYSCTL_ZERO,
1047         },
1048 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1049         {
1050                 .procname       = "fib_multipath_use_neigh",
1051                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1052                 .maxlen         = sizeof(u8),
1053                 .mode           = 0644,
1054                 .proc_handler   = proc_dou8vec_minmax,
1055                 .extra1         = SYSCTL_ZERO,
1056                 .extra2         = SYSCTL_ONE,
1057         },
1058         {
1059                 .procname       = "fib_multipath_hash_policy",
1060                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1061                 .maxlen         = sizeof(u8),
1062                 .mode           = 0644,
1063                 .proc_handler   = proc_fib_multipath_hash_policy,
1064                 .extra1         = SYSCTL_ZERO,
1065                 .extra2         = SYSCTL_THREE,
1066         },
1067         {
1068                 .procname       = "fib_multipath_hash_fields",
1069                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1070                 .maxlen         = sizeof(u32),
1071                 .mode           = 0644,
1072                 .proc_handler   = proc_fib_multipath_hash_fields,
1073                 .extra1         = SYSCTL_ONE,
1074                 .extra2         = &fib_multipath_hash_fields_all_mask,
1075         },
1076 #endif
1077         {
1078                 .procname       = "ip_unprivileged_port_start",
1079                 .maxlen         = sizeof(int),
1080                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1081                 .mode           = 0644,
1082                 .proc_handler   = ipv4_privileged_ports,
1083         },
1084 #ifdef CONFIG_NET_L3_MASTER_DEV
1085         {
1086                 .procname       = "udp_l3mdev_accept",
1087                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1088                 .maxlen         = sizeof(u8),
1089                 .mode           = 0644,
1090                 .proc_handler   = proc_dou8vec_minmax,
1091                 .extra1         = SYSCTL_ZERO,
1092                 .extra2         = SYSCTL_ONE,
1093         },
1094 #endif
1095         {
1096                 .procname       = "tcp_sack",
1097                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1098                 .maxlen         = sizeof(u8),
1099                 .mode           = 0644,
1100                 .proc_handler   = proc_dou8vec_minmax,
1101         },
1102         {
1103                 .procname       = "tcp_window_scaling",
1104                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1105                 .maxlen         = sizeof(u8),
1106                 .mode           = 0644,
1107                 .proc_handler   = proc_dou8vec_minmax,
1108         },
1109         {
1110                 .procname       = "tcp_timestamps",
1111                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1112                 .maxlen         = sizeof(u8),
1113                 .mode           = 0644,
1114                 .proc_handler   = proc_dou8vec_minmax,
1115         },
1116         {
1117                 .procname       = "tcp_early_retrans",
1118                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1119                 .maxlen         = sizeof(u8),
1120                 .mode           = 0644,
1121                 .proc_handler   = proc_dou8vec_minmax,
1122                 .extra1         = SYSCTL_ZERO,
1123                 .extra2         = SYSCTL_FOUR,
1124         },
1125         {
1126                 .procname       = "tcp_recovery",
1127                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1128                 .maxlen         = sizeof(u8),
1129                 .mode           = 0644,
1130                 .proc_handler   = proc_dou8vec_minmax,
1131         },
1132         {
1133                 .procname       = "tcp_thin_linear_timeouts",
1134                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1135                 .maxlen         = sizeof(u8),
1136                 .mode           = 0644,
1137                 .proc_handler   = proc_dou8vec_minmax,
1138         },
1139         {
1140                 .procname       = "tcp_slow_start_after_idle",
1141                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1142                 .maxlen         = sizeof(u8),
1143                 .mode           = 0644,
1144                 .proc_handler   = proc_dou8vec_minmax,
1145         },
1146         {
1147                 .procname       = "tcp_retrans_collapse",
1148                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1149                 .maxlen         = sizeof(u8),
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dou8vec_minmax,
1152         },
1153         {
1154                 .procname       = "tcp_stdurg",
1155                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1156                 .maxlen         = sizeof(u8),
1157                 .mode           = 0644,
1158                 .proc_handler   = proc_dou8vec_minmax,
1159         },
1160         {
1161                 .procname       = "tcp_rfc1337",
1162                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1163                 .maxlen         = sizeof(u8),
1164                 .mode           = 0644,
1165                 .proc_handler   = proc_dou8vec_minmax,
1166         },
1167         {
1168                 .procname       = "tcp_abort_on_overflow",
1169                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1170                 .maxlen         = sizeof(u8),
1171                 .mode           = 0644,
1172                 .proc_handler   = proc_dou8vec_minmax,
1173         },
1174         {
1175                 .procname       = "tcp_fack",
1176                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1177                 .maxlen         = sizeof(u8),
1178                 .mode           = 0644,
1179                 .proc_handler   = proc_dou8vec_minmax,
1180         },
1181         {
1182                 .procname       = "tcp_max_reordering",
1183                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1184                 .maxlen         = sizeof(int),
1185                 .mode           = 0644,
1186                 .proc_handler   = proc_dointvec
1187         },
1188         {
1189                 .procname       = "tcp_dsack",
1190                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1191                 .maxlen         = sizeof(u8),
1192                 .mode           = 0644,
1193                 .proc_handler   = proc_dou8vec_minmax,
1194         },
1195         {
1196                 .procname       = "tcp_app_win",
1197                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1198                 .maxlen         = sizeof(u8),
1199                 .mode           = 0644,
1200                 .proc_handler   = proc_dou8vec_minmax,
1201         },
1202         {
1203                 .procname       = "tcp_adv_win_scale",
1204                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1205                 .maxlen         = sizeof(int),
1206                 .mode           = 0644,
1207                 .proc_handler   = proc_dointvec_minmax,
1208                 .extra1         = &tcp_adv_win_scale_min,
1209                 .extra2         = &tcp_adv_win_scale_max,
1210         },
1211         {
1212                 .procname       = "tcp_frto",
1213                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1214                 .maxlen         = sizeof(u8),
1215                 .mode           = 0644,
1216                 .proc_handler   = proc_dou8vec_minmax,
1217         },
1218         {
1219                 .procname       = "tcp_no_metrics_save",
1220                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1221                 .maxlen         = sizeof(u8),
1222                 .mode           = 0644,
1223                 .proc_handler   = proc_dou8vec_minmax,
1224         },
1225         {
1226                 .procname       = "tcp_no_ssthresh_metrics_save",
1227                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1228                 .maxlen         = sizeof(u8),
1229                 .mode           = 0644,
1230                 .proc_handler   = proc_dou8vec_minmax,
1231                 .extra1         = SYSCTL_ZERO,
1232                 .extra2         = SYSCTL_ONE,
1233         },
1234         {
1235                 .procname       = "tcp_moderate_rcvbuf",
1236                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1237                 .maxlen         = sizeof(u8),
1238                 .mode           = 0644,
1239                 .proc_handler   = proc_dou8vec_minmax,
1240         },
1241         {
1242                 .procname       = "tcp_tso_win_divisor",
1243                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1244                 .maxlen         = sizeof(u8),
1245                 .mode           = 0644,
1246                 .proc_handler   = proc_dou8vec_minmax,
1247         },
1248         {
1249                 .procname       = "tcp_workaround_signed_windows",
1250                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1251                 .maxlen         = sizeof(u8),
1252                 .mode           = 0644,
1253                 .proc_handler   = proc_dou8vec_minmax,
1254         },
1255         {
1256                 .procname       = "tcp_limit_output_bytes",
1257                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1258                 .maxlen         = sizeof(int),
1259                 .mode           = 0644,
1260                 .proc_handler   = proc_dointvec
1261         },
1262         {
1263                 .procname       = "tcp_challenge_ack_limit",
1264                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1265                 .maxlen         = sizeof(int),
1266                 .mode           = 0644,
1267                 .proc_handler   = proc_dointvec
1268         },
1269         {
1270                 .procname       = "tcp_min_tso_segs",
1271                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1272                 .maxlen         = sizeof(u8),
1273                 .mode           = 0644,
1274                 .proc_handler   = proc_dou8vec_minmax,
1275                 .extra1         = SYSCTL_ONE,
1276         },
1277         {
1278                 .procname       = "tcp_tso_rtt_log",
1279                 .data           = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1280                 .maxlen         = sizeof(u8),
1281                 .mode           = 0644,
1282                 .proc_handler   = proc_dou8vec_minmax,
1283         },
1284         {
1285                 .procname       = "tcp_min_rtt_wlen",
1286                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1287                 .maxlen         = sizeof(int),
1288                 .mode           = 0644,
1289                 .proc_handler   = proc_dointvec_minmax,
1290                 .extra1         = SYSCTL_ZERO,
1291                 .extra2         = &one_day_secs
1292         },
1293         {
1294                 .procname       = "tcp_autocorking",
1295                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1296                 .maxlen         = sizeof(u8),
1297                 .mode           = 0644,
1298                 .proc_handler   = proc_dou8vec_minmax,
1299                 .extra1         = SYSCTL_ZERO,
1300                 .extra2         = SYSCTL_ONE,
1301         },
1302         {
1303                 .procname       = "tcp_invalid_ratelimit",
1304                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1305                 .maxlen         = sizeof(int),
1306                 .mode           = 0644,
1307                 .proc_handler   = proc_dointvec_ms_jiffies,
1308         },
1309         {
1310                 .procname       = "tcp_pacing_ss_ratio",
1311                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1312                 .maxlen         = sizeof(int),
1313                 .mode           = 0644,
1314                 .proc_handler   = proc_dointvec_minmax,
1315                 .extra1         = SYSCTL_ZERO,
1316                 .extra2         = SYSCTL_ONE_THOUSAND,
1317         },
1318         {
1319                 .procname       = "tcp_pacing_ca_ratio",
1320                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1321                 .maxlen         = sizeof(int),
1322                 .mode           = 0644,
1323                 .proc_handler   = proc_dointvec_minmax,
1324                 .extra1         = SYSCTL_ZERO,
1325                 .extra2         = SYSCTL_ONE_THOUSAND,
1326         },
1327         {
1328                 .procname       = "tcp_wmem",
1329                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1330                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1331                 .mode           = 0644,
1332                 .proc_handler   = proc_dointvec_minmax,
1333                 .extra1         = SYSCTL_ONE,
1334         },
1335         {
1336                 .procname       = "tcp_rmem",
1337                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1338                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1339                 .mode           = 0644,
1340                 .proc_handler   = proc_dointvec_minmax,
1341                 .extra1         = SYSCTL_ONE,
1342         },
1343         {
1344                 .procname       = "tcp_comp_sack_delay_ns",
1345                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1346                 .maxlen         = sizeof(unsigned long),
1347                 .mode           = 0644,
1348                 .proc_handler   = proc_doulongvec_minmax,
1349         },
1350         {
1351                 .procname       = "tcp_comp_sack_slack_ns",
1352                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1353                 .maxlen         = sizeof(unsigned long),
1354                 .mode           = 0644,
1355                 .proc_handler   = proc_doulongvec_minmax,
1356         },
1357         {
1358                 .procname       = "tcp_comp_sack_nr",
1359                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1360                 .maxlen         = sizeof(u8),
1361                 .mode           = 0644,
1362                 .proc_handler   = proc_dou8vec_minmax,
1363                 .extra1         = SYSCTL_ZERO,
1364         },
1365         {
1366                 .procname       = "tcp_reflect_tos",
1367                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1368                 .maxlen         = sizeof(u8),
1369                 .mode           = 0644,
1370                 .proc_handler   = proc_dou8vec_minmax,
1371                 .extra1         = SYSCTL_ZERO,
1372                 .extra2         = SYSCTL_ONE,
1373         },
1374         {
1375                 .procname       = "tcp_ehash_entries",
1376                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1377                 .mode           = 0444,
1378                 .proc_handler   = proc_tcp_ehash_entries,
1379         },
1380         {
1381                 .procname       = "tcp_child_ehash_entries",
1382                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1383                 .maxlen         = sizeof(unsigned int),
1384                 .mode           = 0644,
1385                 .proc_handler   = proc_douintvec_minmax,
1386                 .extra1         = SYSCTL_ZERO,
1387                 .extra2         = &tcp_child_ehash_entries_max,
1388         },
1389         {
1390                 .procname       = "udp_hash_entries",
1391                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1392                 .mode           = 0444,
1393                 .proc_handler   = proc_udp_hash_entries,
1394         },
1395         {
1396                 .procname       = "udp_child_hash_entries",
1397                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1398                 .maxlen         = sizeof(unsigned int),
1399                 .mode           = 0644,
1400                 .proc_handler   = proc_douintvec_minmax,
1401                 .extra1         = SYSCTL_ZERO,
1402                 .extra2         = &udp_child_hash_entries_max,
1403         },
1404         {
1405                 .procname       = "udp_rmem_min",
1406                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1407                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1408                 .mode           = 0644,
1409                 .proc_handler   = proc_dointvec_minmax,
1410                 .extra1         = SYSCTL_ONE
1411         },
1412         {
1413                 .procname       = "udp_wmem_min",
1414                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1415                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1416                 .mode           = 0644,
1417                 .proc_handler   = proc_dointvec_minmax,
1418                 .extra1         = SYSCTL_ONE
1419         },
1420         {
1421                 .procname       = "fib_notify_on_flag_change",
1422                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1423                 .maxlen         = sizeof(u8),
1424                 .mode           = 0644,
1425                 .proc_handler   = proc_dou8vec_minmax,
1426                 .extra1         = SYSCTL_ZERO,
1427                 .extra2         = SYSCTL_TWO,
1428         },
1429         {
1430                 .procname       = "tcp_plb_enabled",
1431                 .data           = &init_net.ipv4.sysctl_tcp_plb_enabled,
1432                 .maxlen         = sizeof(u8),
1433                 .mode           = 0644,
1434                 .proc_handler   = proc_dou8vec_minmax,
1435                 .extra1         = SYSCTL_ZERO,
1436                 .extra2         = SYSCTL_ONE,
1437         },
1438         {
1439                 .procname       = "tcp_plb_idle_rehash_rounds",
1440                 .data           = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds,
1441                 .maxlen         = sizeof(u8),
1442                 .mode           = 0644,
1443                 .proc_handler   = proc_dou8vec_minmax,
1444                 .extra2         = &tcp_plb_max_rounds,
1445         },
1446         {
1447                 .procname       = "tcp_plb_rehash_rounds",
1448                 .data           = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds,
1449                 .maxlen         = sizeof(u8),
1450                 .mode           = 0644,
1451                 .proc_handler   = proc_dou8vec_minmax,
1452                 .extra2         = &tcp_plb_max_rounds,
1453         },
1454         {
1455                 .procname       = "tcp_plb_suspend_rto_sec",
1456                 .data           = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec,
1457                 .maxlen         = sizeof(u8),
1458                 .mode           = 0644,
1459                 .proc_handler   = proc_dou8vec_minmax,
1460         },
1461         {
1462                 .procname       = "tcp_plb_cong_thresh",
1463                 .data           = &init_net.ipv4.sysctl_tcp_plb_cong_thresh,
1464                 .maxlen         = sizeof(int),
1465                 .mode           = 0644,
1466                 .proc_handler   = proc_dointvec_minmax,
1467                 .extra1         = SYSCTL_ZERO,
1468                 .extra2         = &tcp_plb_max_cong_thresh,
1469         },
1470         { }
1471 };
1472
1473 static __net_init int ipv4_sysctl_init_net(struct net *net)
1474 {
1475         struct ctl_table *table;
1476
1477         table = ipv4_net_table;
1478         if (!net_eq(net, &init_net)) {
1479                 int i;
1480
1481                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1482                 if (!table)
1483                         goto err_alloc;
1484
1485                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1486                         if (table[i].data) {
1487                                 /* Update the variables to point into
1488                                  * the current struct net
1489                                  */
1490                                 table[i].data += (void *)net - (void *)&init_net;
1491                         } else {
1492                                 /* Entries without data pointer are global;
1493                                  * Make them read-only in non-init_net ns
1494                                  */
1495                                 table[i].mode &= ~0222;
1496                         }
1497                 }
1498         }
1499
1500         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1501         if (!net->ipv4.ipv4_hdr)
1502                 goto err_reg;
1503
1504         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1505         if (!net->ipv4.sysctl_local_reserved_ports)
1506                 goto err_ports;
1507
1508         return 0;
1509
1510 err_ports:
1511         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1512 err_reg:
1513         if (!net_eq(net, &init_net))
1514                 kfree(table);
1515 err_alloc:
1516         return -ENOMEM;
1517 }
1518
1519 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1520 {
1521         struct ctl_table *table;
1522
1523         kfree(net->ipv4.sysctl_local_reserved_ports);
1524         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1525         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1526         kfree(table);
1527 }
1528
1529 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1530         .init = ipv4_sysctl_init_net,
1531         .exit = ipv4_sysctl_exit_net,
1532 };
1533
1534 static __init int sysctl_ipv4_init(void)
1535 {
1536         struct ctl_table_header *hdr;
1537
1538         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1539         if (!hdr)
1540                 return -ENOMEM;
1541
1542         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1543                 unregister_net_sysctl_table(hdr);
1544                 return -ENOMEM;
1545         }
1546
1547         return 0;
1548 }
1549
1550 __initcall(sysctl_ipv4_init);