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(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(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(struct ctl_table *table, kgid_t *low, kgid_t *high)
 134 {
 135         kgid_t *data = table->data;
 136         struct net *net =
 137                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 138         unsigned int seq;
 139         do {
 140                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 141
 142                 *low = data[0];
 143                 *high = data[1];
 144         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 145 }
 146
 147 /* Update system visible IP port range */
 148 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 149 {
 150         kgid_t *data = table->data;
 151         struct net *net =
 152                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 153         write_seqlock(&net->ipv4.ping_group_range.lock);
 154         data[0] = low;
 155         data[1] = high;
 156         write_sequnlock(&net->ipv4.ping_group_range.lock);
 157 }
 158
 159 /* Validate changes from /proc interface. */
 160 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 161                                  void *buffer, size_t *lenp, loff_t *ppos)
 162 {
 163         struct user_namespace *user_ns = current_user_ns();
 164         int ret;
 165         unsigned long urange[2];
 166         kgid_t low, high;
 167         struct ctl_table tmp = {
 168                 .data = &urange,
 169                 .maxlen = sizeof(urange),
 170                 .mode = table->mode,
 171                 .extra1 = &ip_ping_group_range_min,
 172                 .extra2 = &ip_ping_group_range_max,
 173         };
 174
 175         inet_get_ping_group_range_table(table, &low, &high);
 176         urange[0] = from_kgid_munged(user_ns, low);
 177         urange[1] = from_kgid_munged(user_ns, high);
 178         ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
 179
 180         if (write && ret == 0) {
 181                 low = make_kgid(user_ns, urange[0]);
 182                 high = make_kgid(user_ns, urange[1]);
 183                 if (!gid_valid(low) || !gid_valid(high))
 184                         return -EINVAL;
 185                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 186                         low = make_kgid(&init_user_ns, 1);
 187                         high = make_kgid(&init_user_ns, 0);
 188                 }
 189                 set_ping_group_range(table, low, high);
 190         }
 191
 192         return ret;
 193 }
 194
 195 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 196                                     void *buffer, size_t *lenp, loff_t *ppos)
 197 {
 198         struct net *net;
 199         int ret;
 200
 201         net = container_of(table->data, struct net,
 202                            ipv4.sysctl_ip_fwd_update_priority);
 203         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 204         if (write && ret == 0)
 205                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 206                                         net);
 207
 208         return ret;
 209 }
 210
 211 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 212                                        void *buffer, size_t *lenp, loff_t *ppos)
 213 {
 214         struct net *net = container_of(ctl->data, struct net,
 215                                        ipv4.tcp_congestion_control);
 216         char val[TCP_CA_NAME_MAX];
 217         struct ctl_table tbl = {
 218                 .data = val,
 219                 .maxlen = TCP_CA_NAME_MAX,
 220         };
 221         int ret;
 222
 223         tcp_get_default_congestion_control(net, val);
 224
 225         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 226         if (write && ret == 0)
 227                 ret = tcp_set_default_congestion_control(net, val);
 228         return ret;
 229 }
 230
 231 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 232                                                  int write, void *buffer,
 233                                                  size_t *lenp, loff_t *ppos)
 234 {
 235         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 236         int ret;
 237
 238         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 239         if (!tbl.data)
 240                 return -ENOMEM;
 241         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 242         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 243         kfree(tbl.data);
 244         return ret;
 245 }
 246
 247 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 248                                            int write, void *buffer,
 249                                            size_t *lenp, loff_t *ppos)
 250 {
 251         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 252         int ret;
 253
 254         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 255         if (!tbl.data)
 256                 return -ENOMEM;
 257
 258         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 259         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 260         if (write && ret == 0)
 261                 ret = tcp_set_allowed_congestion_control(tbl.data);
 262         kfree(tbl.data);
 263         return ret;
 264 }
 265
 266 static int sscanf_key(char *buf, __le32 *key)
 267 {
 268         u32 user_key[4];
 269         int i, ret = 0;
 270
 271         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 272                    user_key + 2, user_key + 3) != 4) {
 273                 ret = -EINVAL;
 274         } else {
 275                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 276                         key[i] = cpu_to_le32(user_key[i]);
 277         }
 278         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 279                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 280
 281         return ret;
 282 }
 283
 284 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 285                                  void *buffer, size_t *lenp, loff_t *ppos)
 286 {
 287         struct net *net = container_of(table->data, struct net,
 288             ipv4.sysctl_tcp_fastopen);
 289         /* maxlen to print the list of keys in hex (*2), with dashes
 290          * separating doublewords and a comma in between keys.
 291          */
 292         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 293                                             2 * TCP_FASTOPEN_KEY_MAX) +
 294                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 295         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 296         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 297         char *backup_data;
 298         int ret, i = 0, off = 0, n_keys;
 299
 300         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 301         if (!tbl.data)
 302                 return -ENOMEM;
 303
 304         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 305         if (!n_keys) {
 306                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 307                 n_keys = 1;
 308         }
 309
 310         for (i = 0; i < n_keys * 4; i++)
 311                 user_key[i] = le32_to_cpu(key[i]);
 312
 313         for (i = 0; i < n_keys; i++) {
 314                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 315                                 "%08x-%08x-%08x-%08x",
 316                                 user_key[i * 4],
 317                                 user_key[i * 4 + 1],
 318                                 user_key[i * 4 + 2],
 319                                 user_key[i * 4 + 3]);
 320
 321                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 322                         break;
 323
 324                 if (i + 1 < n_keys)
 325                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 326         }
 327
 328         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 329
 330         if (write && ret == 0) {
 331                 backup_data = strchr(tbl.data, ',');
 332                 if (backup_data) {
 333                         *backup_data = '\0';
 334                         backup_data++;
 335                 }
 336                 if (sscanf_key(tbl.data, key)) {
 337                         ret = -EINVAL;
 338                         goto bad_key;
 339                 }
 340                 if (backup_data) {
 341                         if (sscanf_key(backup_data, key + 4)) {
 342                                 ret = -EINVAL;
 343                                 goto bad_key;
 344                         }
 345                 }
 346                 tcp_fastopen_reset_cipher(net, NULL, key,
 347                                           backup_data ? key + 4 : NULL);
 348         }
 349
 350 bad_key:
 351         kfree(tbl.data);
 352         return ret;
 353 }
 354
 355 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 356                                              int write, void *buffer,
 357                                              size_t *lenp, loff_t *ppos)
 358 {
 359         struct net *net = container_of(table->data, struct net,
 360             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 361         int ret;
 362
 363         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 364         if (write && ret == 0)
 365                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 366
 367         return ret;
 368 }
 369
 370 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 371                                   int write, void *buffer, size_t *lenp,
 372                                   loff_t *ppos)
 373 {
 374         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 375         int ret;
 376
 377         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 378         if (!tbl.data)
 379                 return -ENOMEM;
 380         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 381         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 382         kfree(tbl.data);
 383
 384         return ret;
 385 }
 386
 387 static int proc_tcp_ehash_entries(struct ctl_table *table, int write,
 388                                   void *buffer, size_t *lenp, loff_t *ppos)
 389 {
 390         struct net *net = container_of(table->data, struct net,
 391                                        ipv4.sysctl_tcp_child_ehash_entries);
 392         struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo;
 393         int tcp_ehash_entries;
 394         struct ctl_table tbl;
 395
 396         tcp_ehash_entries = hinfo->ehash_mask + 1;
 397
 398         /* A negative number indicates that the child netns
 399          * shares the global ehash.
 400          */
 401         if (!net_eq(net, &init_net) && !hinfo->pernet)
 402                 tcp_ehash_entries *= -1;
 403
 404         memset(&tbl, 0, sizeof(tbl));
 405         tbl.data = &tcp_ehash_entries;
 406         tbl.maxlen = sizeof(int);
 407
 408         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
 409 }
 410
 411 static int proc_udp_hash_entries(struct ctl_table *table, int write,
 412                                  void *buffer, size_t *lenp, loff_t *ppos)
 413 {
 414         struct net *net = container_of(table->data, struct net,
 415                                        ipv4.sysctl_udp_child_hash_entries);
 416         int udp_hash_entries;
 417         struct ctl_table tbl;
 418
 419         udp_hash_entries = net->ipv4.udp_table->mask + 1;
 420
 421         /* A negative number indicates that the child netns
 422          * shares the global udp_table.
 423          */
 424         if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table)
 425                 udp_hash_entries *= -1;
 426
 427         memset(&tbl, 0, sizeof(tbl));
 428         tbl.data = &udp_hash_entries;
 429         tbl.maxlen = sizeof(int);
 430
 431         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
 432 }
 433
 434 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 435 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 436                                           void *buffer, size_t *lenp,
 437                                           loff_t *ppos)
 438 {
 439         struct net *net = container_of(table->data, struct net,
 440             ipv4.sysctl_fib_multipath_hash_policy);
 441         int ret;
 442
 443         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 444         if (write && ret == 0)
 445                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 446
 447         return ret;
 448 }
 449
 450 static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write,
 451                                           void *buffer, size_t *lenp,
 452                                           loff_t *ppos)
 453 {
 454         struct net *net;
 455         int ret;
 456
 457         net = container_of(table->data, struct net,
 458                            ipv4.sysctl_fib_multipath_hash_fields);
 459         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
 460         if (write && ret == 0)
 461                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 462
 463         return ret;
 464 }
 465 #endif
 466
 467 static struct ctl_table ipv4_table[] = {
 468         {
 469                 .procname       = "tcp_max_orphans",
 470                 .data           = &sysctl_tcp_max_orphans,
 471                 .maxlen         = sizeof(int),
 472                 .mode           = 0644,
 473                 .proc_handler   = proc_dointvec
 474         },
 475         {
 476                 .procname       = "inet_peer_threshold",
 477                 .data           = &inet_peer_threshold,
 478                 .maxlen         = sizeof(int),
 479                 .mode           = 0644,
 480                 .proc_handler   = proc_dointvec
 481         },
 482         {
 483                 .procname       = "inet_peer_minttl",
 484                 .data           = &inet_peer_minttl,
 485                 .maxlen         = sizeof(int),
 486                 .mode           = 0644,
 487                 .proc_handler   = proc_dointvec_jiffies,
 488         },
 489         {
 490                 .procname       = "inet_peer_maxttl",
 491                 .data           = &inet_peer_maxttl,
 492                 .maxlen         = sizeof(int),
 493                 .mode           = 0644,
 494                 .proc_handler   = proc_dointvec_jiffies,
 495         },
 496         {
 497                 .procname       = "tcp_mem",
 498                 .maxlen         = sizeof(sysctl_tcp_mem),
 499                 .data           = &sysctl_tcp_mem,
 500                 .mode           = 0644,
 501                 .proc_handler   = proc_doulongvec_minmax,
 502         },
 503         {
 504                 .procname       = "tcp_low_latency",
 505                 .data           = &sysctl_tcp_low_latency,
 506                 .maxlen         = sizeof(int),
 507                 .mode           = 0644,
 508                 .proc_handler   = proc_dointvec
 509         },
 510 #ifdef CONFIG_NETLABEL
 511         {
 512                 .procname       = "cipso_cache_enable",
 513                 .data           = &cipso_v4_cache_enabled,
 514                 .maxlen         = sizeof(int),
 515                 .mode           = 0644,
 516                 .proc_handler   = proc_dointvec,
 517         },
 518         {
 519                 .procname       = "cipso_cache_bucket_size",
 520                 .data           = &cipso_v4_cache_bucketsize,
 521                 .maxlen         = sizeof(int),
 522                 .mode           = 0644,
 523                 .proc_handler   = proc_dointvec,
 524         },
 525         {
 526                 .procname       = "cipso_rbm_optfmt",
 527                 .data           = &cipso_v4_rbm_optfmt,
 528                 .maxlen         = sizeof(int),
 529                 .mode           = 0644,
 530                 .proc_handler   = proc_dointvec,
 531         },
 532         {
 533                 .procname       = "cipso_rbm_strictvalid",
 534                 .data           = &cipso_v4_rbm_strictvalid,
 535                 .maxlen         = sizeof(int),
 536                 .mode           = 0644,
 537                 .proc_handler   = proc_dointvec,
 538         },
 539 #endif /* CONFIG_NETLABEL */
 540         {
 541                 .procname       = "tcp_available_ulp",
 542                 .maxlen         = TCP_ULP_BUF_MAX,
 543                 .mode           = 0444,
 544                 .proc_handler   = proc_tcp_available_ulp,
 545         },
 546         {
 547                 .procname       = "icmp_msgs_per_sec",
 548                 .data           = &sysctl_icmp_msgs_per_sec,
 549                 .maxlen         = sizeof(int),
 550                 .mode           = 0644,
 551                 .proc_handler   = proc_dointvec_minmax,
 552                 .extra1         = SYSCTL_ZERO,
 553         },
 554         {
 555                 .procname       = "icmp_msgs_burst",
 556                 .data           = &sysctl_icmp_msgs_burst,
 557                 .maxlen         = sizeof(int),
 558                 .mode           = 0644,
 559                 .proc_handler   = proc_dointvec_minmax,
 560                 .extra1         = SYSCTL_ZERO,
 561         },
 562         {
 563                 .procname       = "udp_mem",
 564                 .data           = &sysctl_udp_mem,
 565                 .maxlen         = sizeof(sysctl_udp_mem),
 566                 .mode           = 0644,
 567                 .proc_handler   = proc_doulongvec_minmax,
 568         },
 569         {
 570                 .procname       = "fib_sync_mem",
 571                 .data           = &sysctl_fib_sync_mem,
 572                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 573                 .mode           = 0644,
 574                 .proc_handler   = proc_douintvec_minmax,
 575                 .extra1         = &sysctl_fib_sync_mem_min,
 576                 .extra2         = &sysctl_fib_sync_mem_max,
 577         },
 578         { }
 579 };
 580
 581 static struct ctl_table ipv4_net_table[] = {
 582         {
 583                 .procname       = "tcp_max_tw_buckets",
 584                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 585                 .maxlen         = sizeof(int),
 586                 .mode           = 0644,
 587                 .proc_handler   = proc_dointvec
 588         },
 589         {
 590                 .procname       = "icmp_echo_ignore_all",
 591                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 592                 .maxlen         = sizeof(u8),
 593                 .mode           = 0644,
 594                 .proc_handler   = proc_dou8vec_minmax,
 595                 .extra1         = SYSCTL_ZERO,
 596                 .extra2         = SYSCTL_ONE
 597         },
 598         {
 599                 .procname       = "icmp_echo_enable_probe",
 600                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 601                 .maxlen         = sizeof(u8),
 602                 .mode           = 0644,
 603                 .proc_handler   = proc_dou8vec_minmax,
 604                 .extra1         = SYSCTL_ZERO,
 605                 .extra2         = SYSCTL_ONE
 606         },
 607         {
 608                 .procname       = "icmp_echo_ignore_broadcasts",
 609                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 610                 .maxlen         = sizeof(u8),
 611                 .mode           = 0644,
 612                 .proc_handler   = proc_dou8vec_minmax,
 613                 .extra1         = SYSCTL_ZERO,
 614                 .extra2         = SYSCTL_ONE
 615         },
 616         {
 617                 .procname       = "icmp_ignore_bogus_error_responses",
 618                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 619                 .maxlen         = sizeof(u8),
 620                 .mode           = 0644,
 621                 .proc_handler   = proc_dou8vec_minmax,
 622                 .extra1         = SYSCTL_ZERO,
 623                 .extra2         = SYSCTL_ONE
 624         },
 625         {
 626                 .procname       = "icmp_errors_use_inbound_ifaddr",
 627                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 628                 .maxlen         = sizeof(u8),
 629                 .mode           = 0644,
 630                 .proc_handler   = proc_dou8vec_minmax,
 631                 .extra1         = SYSCTL_ZERO,
 632                 .extra2         = SYSCTL_ONE
 633         },
 634         {
 635                 .procname       = "icmp_ratelimit",
 636                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 637                 .maxlen         = sizeof(int),
 638                 .mode           = 0644,
 639                 .proc_handler   = proc_dointvec_ms_jiffies,
 640         },
 641         {
 642                 .procname       = "icmp_ratemask",
 643                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 644                 .maxlen         = sizeof(int),
 645                 .mode           = 0644,
 646                 .proc_handler   = proc_dointvec
 647         },
 648         {
 649                 .procname       = "ping_group_range",
 650                 .data           = &init_net.ipv4.ping_group_range.range,
 651                 .maxlen         = sizeof(gid_t)*2,
 652                 .mode           = 0644,
 653                 .proc_handler   = ipv4_ping_group_range,
 654         },
 655 #ifdef CONFIG_NET_L3_MASTER_DEV
 656         {
 657                 .procname       = "raw_l3mdev_accept",
 658                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 659                 .maxlen         = sizeof(u8),
 660                 .mode           = 0644,
 661                 .proc_handler   = proc_dou8vec_minmax,
 662                 .extra1         = SYSCTL_ZERO,
 663                 .extra2         = SYSCTL_ONE,
 664         },
 665 #endif
 666         {
 667                 .procname       = "tcp_ecn",
 668                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 669                 .maxlen         = sizeof(u8),
 670                 .mode           = 0644,
 671                 .proc_handler   = proc_dou8vec_minmax,
 672                 .extra1         = SYSCTL_ZERO,
 673                 .extra2         = SYSCTL_TWO,
 674         },
 675         {
 676                 .procname       = "tcp_ecn_fallback",
 677                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 678                 .maxlen         = sizeof(u8),
 679                 .mode           = 0644,
 680                 .proc_handler   = proc_dou8vec_minmax,
 681                 .extra1         = SYSCTL_ZERO,
 682                 .extra2         = SYSCTL_ONE,
 683         },
 684         {
 685                 .procname       = "ip_dynaddr",
 686                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 687                 .maxlen         = sizeof(u8),
 688                 .mode           = 0644,
 689                 .proc_handler   = proc_dou8vec_minmax,
 690         },
 691         {
 692                 .procname       = "ip_early_demux",
 693                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 694                 .maxlen         = sizeof(u8),
 695                 .mode           = 0644,
 696                 .proc_handler   = proc_dou8vec_minmax,
 697         },
 698         {
 699                 .procname       = "udp_early_demux",
 700                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 701                 .maxlen         = sizeof(u8),
 702                 .mode           = 0644,
 703                 .proc_handler   = proc_dou8vec_minmax,
 704         },
 705         {
 706                 .procname       = "tcp_early_demux",
 707                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 708                 .maxlen         = sizeof(u8),
 709                 .mode           = 0644,
 710                 .proc_handler   = proc_dou8vec_minmax,
 711         },
 712         {
 713                 .procname       = "nexthop_compat_mode",
 714                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 715                 .maxlen         = sizeof(u8),
 716                 .mode           = 0644,
 717                 .proc_handler   = proc_dou8vec_minmax,
 718                 .extra1         = SYSCTL_ZERO,
 719                 .extra2         = SYSCTL_ONE,
 720         },
 721         {
 722                 .procname       = "ip_default_ttl",
 723                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 724                 .maxlen         = sizeof(u8),
 725                 .mode           = 0644,
 726                 .proc_handler   = proc_dou8vec_minmax,
 727                 .extra1         = &ip_ttl_min,
 728                 .extra2         = &ip_ttl_max,
 729         },
 730         {
 731                 .procname       = "ip_local_port_range",
 732                 .maxlen         = 0,
 733                 .data           = &init_net,
 734                 .mode           = 0644,
 735                 .proc_handler   = ipv4_local_port_range,
 736         },
 737         {
 738                 .procname       = "ip_local_reserved_ports",
 739                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 740                 .maxlen         = 65536,
 741                 .mode           = 0644,
 742                 .proc_handler   = proc_do_large_bitmap,
 743         },
 744         {
 745                 .procname       = "ip_no_pmtu_disc",
 746                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 747                 .maxlen         = sizeof(u8),
 748                 .mode           = 0644,
 749                 .proc_handler   = proc_dou8vec_minmax,
 750         },
 751         {
 752                 .procname       = "ip_forward_use_pmtu",
 753                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 754                 .maxlen         = sizeof(u8),
 755                 .mode           = 0644,
 756                 .proc_handler   = proc_dou8vec_minmax,
 757         },
 758         {
 759                 .procname       = "ip_forward_update_priority",
 760                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 761                 .maxlen         = sizeof(u8),
 762                 .mode           = 0644,
 763                 .proc_handler   = ipv4_fwd_update_priority,
 764                 .extra1         = SYSCTL_ZERO,
 765                 .extra2         = SYSCTL_ONE,
 766         },
 767         {
 768                 .procname       = "ip_nonlocal_bind",
 769                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 770                 .maxlen         = sizeof(u8),
 771                 .mode           = 0644,
 772                 .proc_handler   = proc_dou8vec_minmax,
 773         },
 774         {
 775                 .procname       = "ip_autobind_reuse",
 776                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 777                 .maxlen         = sizeof(u8),
 778                 .mode           = 0644,
 779                 .proc_handler   = proc_dou8vec_minmax,
 780                 .extra1         = SYSCTL_ZERO,
 781                 .extra2         = SYSCTL_ONE,
 782         },
 783         {
 784                 .procname       = "fwmark_reflect",
 785                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 786                 .maxlen         = sizeof(u8),
 787                 .mode           = 0644,
 788                 .proc_handler   = proc_dou8vec_minmax,
 789         },
 790         {
 791                 .procname       = "tcp_fwmark_accept",
 792                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 793                 .maxlen         = sizeof(u8),
 794                 .mode           = 0644,
 795                 .proc_handler   = proc_dou8vec_minmax,
 796         },
 797 #ifdef CONFIG_NET_L3_MASTER_DEV
 798         {
 799                 .procname       = "tcp_l3mdev_accept",
 800                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 801                 .maxlen         = sizeof(u8),
 802                 .mode           = 0644,
 803                 .proc_handler   = proc_dou8vec_minmax,
 804                 .extra1         = SYSCTL_ZERO,
 805                 .extra2         = SYSCTL_ONE,
 806         },
 807 #endif
 808         {
 809                 .procname       = "tcp_mtu_probing",
 810                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 811                 .maxlen         = sizeof(u8),
 812                 .mode           = 0644,
 813                 .proc_handler   = proc_dou8vec_minmax,
 814         },
 815         {
 816                 .procname       = "tcp_base_mss",
 817                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 818                 .maxlen         = sizeof(int),
 819                 .mode           = 0644,
 820                 .proc_handler   = proc_dointvec,
 821         },
 822         {
 823                 .procname       = "tcp_min_snd_mss",
 824                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 825                 .maxlen         = sizeof(int),
 826                 .mode           = 0644,
 827                 .proc_handler   = proc_dointvec_minmax,
 828                 .extra1         = &tcp_min_snd_mss_min,
 829                 .extra2         = &tcp_min_snd_mss_max,
 830         },
 831         {
 832                 .procname       = "tcp_mtu_probe_floor",
 833                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 834                 .maxlen         = sizeof(int),
 835                 .mode           = 0644,
 836                 .proc_handler   = proc_dointvec_minmax,
 837                 .extra1         = &tcp_min_snd_mss_min,
 838                 .extra2         = &tcp_min_snd_mss_max,
 839         },
 840         {
 841                 .procname       = "tcp_probe_threshold",
 842                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 843                 .maxlen         = sizeof(int),
 844                 .mode           = 0644,
 845                 .proc_handler   = proc_dointvec,
 846         },
 847         {
 848                 .procname       = "tcp_probe_interval",
 849                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 850                 .maxlen         = sizeof(u32),
 851                 .mode           = 0644,
 852                 .proc_handler   = proc_douintvec_minmax,
 853                 .extra2         = &u32_max_div_HZ,
 854         },
 855         {
 856                 .procname       = "igmp_link_local_mcast_reports",
 857                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 858                 .maxlen         = sizeof(u8),
 859                 .mode           = 0644,
 860                 .proc_handler   = proc_dou8vec_minmax,
 861         },
 862         {
 863                 .procname       = "igmp_max_memberships",
 864                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 865                 .maxlen         = sizeof(int),
 866                 .mode           = 0644,
 867                 .proc_handler   = proc_dointvec
 868         },
 869         {
 870                 .procname       = "igmp_max_msf",
 871                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 872                 .maxlen         = sizeof(int),
 873                 .mode           = 0644,
 874                 .proc_handler   = proc_dointvec
 875         },
 876 #ifdef CONFIG_IP_MULTICAST
 877         {
 878                 .procname       = "igmp_qrv",
 879                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 880                 .maxlen         = sizeof(int),
 881                 .mode           = 0644,
 882                 .proc_handler   = proc_dointvec_minmax,
 883                 .extra1         = SYSCTL_ONE
 884         },
 885 #endif
 886         {
 887                 .procname       = "tcp_congestion_control",
 888                 .data           = &init_net.ipv4.tcp_congestion_control,
 889                 .mode           = 0644,
 890                 .maxlen         = TCP_CA_NAME_MAX,
 891                 .proc_handler   = proc_tcp_congestion_control,
 892         },
 893         {
 894                 .procname       = "tcp_available_congestion_control",
 895                 .maxlen         = TCP_CA_BUF_MAX,
 896                 .mode           = 0444,
 897                 .proc_handler   = proc_tcp_available_congestion_control,
 898         },
 899         {
 900                 .procname       = "tcp_allowed_congestion_control",
 901                 .maxlen         = TCP_CA_BUF_MAX,
 902                 .mode           = 0644,
 903                 .proc_handler   = proc_allowed_congestion_control,
 904         },
 905         {
 906                 .procname       = "tcp_keepalive_time",
 907                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 908                 .maxlen         = sizeof(int),
 909                 .mode           = 0644,
 910                 .proc_handler   = proc_dointvec_jiffies,
 911         },
 912         {
 913                 .procname       = "tcp_keepalive_probes",
 914                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 915                 .maxlen         = sizeof(u8),
 916                 .mode           = 0644,
 917                 .proc_handler   = proc_dou8vec_minmax,
 918         },
 919         {
 920                 .procname       = "tcp_keepalive_intvl",
 921                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 922                 .maxlen         = sizeof(int),
 923                 .mode           = 0644,
 924                 .proc_handler   = proc_dointvec_jiffies,
 925         },
 926         {
 927                 .procname       = "tcp_syn_retries",
 928                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 929                 .maxlen         = sizeof(u8),
 930                 .mode           = 0644,
 931                 .proc_handler   = proc_dou8vec_minmax,
 932                 .extra1         = &tcp_syn_retries_min,
 933                 .extra2         = &tcp_syn_retries_max
 934         },
 935         {
 936                 .procname       = "tcp_synack_retries",
 937                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 938                 .maxlen         = sizeof(u8),
 939                 .mode           = 0644,
 940                 .proc_handler   = proc_dou8vec_minmax,
 941         },
 942 #ifdef CONFIG_SYN_COOKIES
 943         {
 944                 .procname       = "tcp_syncookies",
 945                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 946                 .maxlen         = sizeof(u8),
 947                 .mode           = 0644,
 948                 .proc_handler   = proc_dou8vec_minmax,
 949         },
 950 #endif
 951         {
 952                 .procname       = "tcp_migrate_req",
 953                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 954                 .maxlen         = sizeof(u8),
 955                 .mode           = 0644,
 956                 .proc_handler   = proc_dou8vec_minmax,
 957                 .extra1         = SYSCTL_ZERO,
 958                 .extra2         = SYSCTL_ONE
 959         },
 960         {
 961                 .procname       = "tcp_reordering",
 962                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 963                 .maxlen         = sizeof(int),
 964                 .mode           = 0644,
 965                 .proc_handler   = proc_dointvec
 966         },
 967         {
 968                 .procname       = "tcp_retries1",
 969                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 970                 .maxlen         = sizeof(u8),
 971                 .mode           = 0644,
 972                 .proc_handler   = proc_dou8vec_minmax,
 973                 .extra2         = &tcp_retr1_max
 974         },
 975         {
 976                 .procname       = "tcp_retries2",
 977                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 978                 .maxlen         = sizeof(u8),
 979                 .mode           = 0644,
 980                 .proc_handler   = proc_dou8vec_minmax,
 981         },
 982         {
 983                 .procname       = "tcp_orphan_retries",
 984                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 985                 .maxlen         = sizeof(u8),
 986                 .mode           = 0644,
 987                 .proc_handler   = proc_dou8vec_minmax,
 988         },
 989         {
 990                 .procname       = "tcp_fin_timeout",
 991                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 992                 .maxlen         = sizeof(int),
 993                 .mode           = 0644,
 994                 .proc_handler   = proc_dointvec_jiffies,
 995         },
 996         {
 997                 .procname       = "tcp_notsent_lowat",
 998                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 999                 .maxlen         = sizeof(unsigned int),
1000                 .mode           = 0644,
1001                 .proc_handler   = proc_douintvec,
1002         },
1003         {
1004                 .procname       = "tcp_tw_reuse",
1005                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
1006                 .maxlen         = sizeof(u8),
1007                 .mode           = 0644,
1008                 .proc_handler   = proc_dou8vec_minmax,
1009                 .extra1         = SYSCTL_ZERO,
1010                 .extra2         = SYSCTL_TWO,
1011         },
1012         {
1013                 .procname       = "tcp_max_syn_backlog",
1014                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1015                 .maxlen         = sizeof(int),
1016                 .mode           = 0644,
1017                 .proc_handler   = proc_dointvec
1018         },
1019         {
1020                 .procname       = "tcp_fastopen",
1021                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1022                 .maxlen         = sizeof(int),
1023                 .mode           = 0644,
1024                 .proc_handler   = proc_dointvec,
1025         },
1026         {
1027                 .procname       = "tcp_fastopen_key",
1028                 .mode           = 0600,
1029                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1030                 /* maxlen to print the list of keys in hex (*2), with dashes
1031                  * separating doublewords and a comma in between keys.
1032                  */
1033                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1034                                    2 * TCP_FASTOPEN_KEY_MAX) +
1035                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1036                 .proc_handler   = proc_tcp_fastopen_key,
1037         },
1038         {
1039                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1040                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1041                 .maxlen         = sizeof(int),
1042                 .mode           = 0644,
1043                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1044                 .extra1         = SYSCTL_ZERO,
1045         },
1046 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1047         {
1048                 .procname       = "fib_multipath_use_neigh",
1049                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1050                 .maxlen         = sizeof(u8),
1051                 .mode           = 0644,
1052                 .proc_handler   = proc_dou8vec_minmax,
1053                 .extra1         = SYSCTL_ZERO,
1054                 .extra2         = SYSCTL_ONE,
1055         },
1056         {
1057                 .procname       = "fib_multipath_hash_policy",
1058                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1059                 .maxlen         = sizeof(u8),
1060                 .mode           = 0644,
1061                 .proc_handler   = proc_fib_multipath_hash_policy,
1062                 .extra1         = SYSCTL_ZERO,
1063                 .extra2         = SYSCTL_THREE,
1064         },
1065         {
1066                 .procname       = "fib_multipath_hash_fields",
1067                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1068                 .maxlen         = sizeof(u32),
1069                 .mode           = 0644,
1070                 .proc_handler   = proc_fib_multipath_hash_fields,
1071                 .extra1         = SYSCTL_ONE,
1072                 .extra2         = &fib_multipath_hash_fields_all_mask,
1073         },
1074 #endif
1075         {
1076                 .procname       = "ip_unprivileged_port_start",
1077                 .maxlen         = sizeof(int),
1078                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1079                 .mode           = 0644,
1080                 .proc_handler   = ipv4_privileged_ports,
1081         },
1082 #ifdef CONFIG_NET_L3_MASTER_DEV
1083         {
1084                 .procname       = "udp_l3mdev_accept",
1085                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1086                 .maxlen         = sizeof(u8),
1087                 .mode           = 0644,
1088                 .proc_handler   = proc_dou8vec_minmax,
1089                 .extra1         = SYSCTL_ZERO,
1090                 .extra2         = SYSCTL_ONE,
1091         },
1092 #endif
1093         {
1094                 .procname       = "tcp_sack",
1095                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1096                 .maxlen         = sizeof(u8),
1097                 .mode           = 0644,
1098                 .proc_handler   = proc_dou8vec_minmax,
1099         },
1100         {
1101                 .procname       = "tcp_window_scaling",
1102                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1103                 .maxlen         = sizeof(u8),
1104                 .mode           = 0644,
1105                 .proc_handler   = proc_dou8vec_minmax,
1106         },
1107         {
1108                 .procname       = "tcp_timestamps",
1109                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1110                 .maxlen         = sizeof(u8),
1111                 .mode           = 0644,
1112                 .proc_handler   = proc_dou8vec_minmax,
1113         },
1114         {
1115                 .procname       = "tcp_early_retrans",
1116                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1117                 .maxlen         = sizeof(u8),
1118                 .mode           = 0644,
1119                 .proc_handler   = proc_dou8vec_minmax,
1120                 .extra1         = SYSCTL_ZERO,
1121                 .extra2         = SYSCTL_FOUR,
1122         },
1123         {
1124                 .procname       = "tcp_recovery",
1125                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1126                 .maxlen         = sizeof(u8),
1127                 .mode           = 0644,
1128                 .proc_handler   = proc_dou8vec_minmax,
1129         },
1130         {
1131                 .procname       = "tcp_thin_linear_timeouts",
1132                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1133                 .maxlen         = sizeof(u8),
1134                 .mode           = 0644,
1135                 .proc_handler   = proc_dou8vec_minmax,
1136         },
1137         {
1138                 .procname       = "tcp_slow_start_after_idle",
1139                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1140                 .maxlen         = sizeof(u8),
1141                 .mode           = 0644,
1142                 .proc_handler   = proc_dou8vec_minmax,
1143         },
1144         {
1145                 .procname       = "tcp_retrans_collapse",
1146                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1147                 .maxlen         = sizeof(u8),
1148                 .mode           = 0644,
1149                 .proc_handler   = proc_dou8vec_minmax,
1150         },
1151         {
1152                 .procname       = "tcp_stdurg",
1153                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1154                 .maxlen         = sizeof(u8),
1155                 .mode           = 0644,
1156                 .proc_handler   = proc_dou8vec_minmax,
1157         },
1158         {
1159                 .procname       = "tcp_rfc1337",
1160                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1161                 .maxlen         = sizeof(u8),
1162                 .mode           = 0644,
1163                 .proc_handler   = proc_dou8vec_minmax,
1164         },
1165         {
1166                 .procname       = "tcp_abort_on_overflow",
1167                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1168                 .maxlen         = sizeof(u8),
1169                 .mode           = 0644,
1170                 .proc_handler   = proc_dou8vec_minmax,
1171         },
1172         {
1173                 .procname       = "tcp_fack",
1174                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1175                 .maxlen         = sizeof(u8),
1176                 .mode           = 0644,
1177                 .proc_handler   = proc_dou8vec_minmax,
1178         },
1179         {
1180                 .procname       = "tcp_max_reordering",
1181                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1182                 .maxlen         = sizeof(int),
1183                 .mode           = 0644,
1184                 .proc_handler   = proc_dointvec
1185         },
1186         {
1187                 .procname       = "tcp_dsack",
1188                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1189                 .maxlen         = sizeof(u8),
1190                 .mode           = 0644,
1191                 .proc_handler   = proc_dou8vec_minmax,
1192         },
1193         {
1194                 .procname       = "tcp_app_win",
1195                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1196                 .maxlen         = sizeof(u8),
1197                 .mode           = 0644,
1198                 .proc_handler   = proc_dou8vec_minmax,
1199                 .extra1         = SYSCTL_ZERO,
1200                 .extra2         = &tcp_app_win_max,
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_backlog_ack_defer",
1367                 .data           = &init_net.ipv4.sysctl_tcp_backlog_ack_defer,
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_reflect_tos",
1376                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1377                 .maxlen         = sizeof(u8),
1378                 .mode           = 0644,
1379                 .proc_handler   = proc_dou8vec_minmax,
1380                 .extra1         = SYSCTL_ZERO,
1381                 .extra2         = SYSCTL_ONE,
1382         },
1383         {
1384                 .procname       = "tcp_ehash_entries",
1385                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1386                 .mode           = 0444,
1387                 .proc_handler   = proc_tcp_ehash_entries,
1388         },
1389         {
1390                 .procname       = "tcp_child_ehash_entries",
1391                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1392                 .maxlen         = sizeof(unsigned int),
1393                 .mode           = 0644,
1394                 .proc_handler   = proc_douintvec_minmax,
1395                 .extra1         = SYSCTL_ZERO,
1396                 .extra2         = &tcp_child_ehash_entries_max,
1397         },
1398         {
1399                 .procname       = "udp_hash_entries",
1400                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1401                 .mode           = 0444,
1402                 .proc_handler   = proc_udp_hash_entries,
1403         },
1404         {
1405                 .procname       = "udp_child_hash_entries",
1406                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1407                 .maxlen         = sizeof(unsigned int),
1408                 .mode           = 0644,
1409                 .proc_handler   = proc_douintvec_minmax,
1410                 .extra1         = SYSCTL_ZERO,
1411                 .extra2         = &udp_child_hash_entries_max,
1412         },
1413         {
1414                 .procname       = "udp_rmem_min",
1415                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1416                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1417                 .mode           = 0644,
1418                 .proc_handler   = proc_dointvec_minmax,
1419                 .extra1         = SYSCTL_ONE
1420         },
1421         {
1422                 .procname       = "udp_wmem_min",
1423                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1424                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1425                 .mode           = 0644,
1426                 .proc_handler   = proc_dointvec_minmax,
1427                 .extra1         = SYSCTL_ONE
1428         },
1429         {
1430                 .procname       = "fib_notify_on_flag_change",
1431                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1432                 .maxlen         = sizeof(u8),
1433                 .mode           = 0644,
1434                 .proc_handler   = proc_dou8vec_minmax,
1435                 .extra1         = SYSCTL_ZERO,
1436                 .extra2         = SYSCTL_TWO,
1437         },
1438         {
1439                 .procname       = "tcp_plb_enabled",
1440                 .data           = &init_net.ipv4.sysctl_tcp_plb_enabled,
1441                 .maxlen         = sizeof(u8),
1442                 .mode           = 0644,
1443                 .proc_handler   = proc_dou8vec_minmax,
1444                 .extra1         = SYSCTL_ZERO,
1445                 .extra2         = SYSCTL_ONE,
1446         },
1447         {
1448                 .procname       = "tcp_plb_idle_rehash_rounds",
1449                 .data           = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds,
1450                 .maxlen         = sizeof(u8),
1451                 .mode           = 0644,
1452                 .proc_handler   = proc_dou8vec_minmax,
1453                 .extra2         = &tcp_plb_max_rounds,
1454         },
1455         {
1456                 .procname       = "tcp_plb_rehash_rounds",
1457                 .data           = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds,
1458                 .maxlen         = sizeof(u8),
1459                 .mode           = 0644,
1460                 .proc_handler   = proc_dou8vec_minmax,
1461                 .extra2         = &tcp_plb_max_rounds,
1462         },
1463         {
1464                 .procname       = "tcp_plb_suspend_rto_sec",
1465                 .data           = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec,
1466                 .maxlen         = sizeof(u8),
1467                 .mode           = 0644,
1468                 .proc_handler   = proc_dou8vec_minmax,
1469         },
1470         {
1471                 .procname       = "tcp_plb_cong_thresh",
1472                 .data           = &init_net.ipv4.sysctl_tcp_plb_cong_thresh,
1473                 .maxlen         = sizeof(int),
1474                 .mode           = 0644,
1475                 .proc_handler   = proc_dointvec_minmax,
1476                 .extra1         = SYSCTL_ZERO,
1477                 .extra2         = &tcp_plb_max_cong_thresh,
1478         },
1479         {
1480                 .procname       = "tcp_syn_linear_timeouts",
1481                 .data           = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts,
1482                 .maxlen         = sizeof(u8),
1483                 .mode           = 0644,
1484                 .proc_handler   = proc_dou8vec_minmax,
1485                 .extra1         = SYSCTL_ZERO,
1486                 .extra2         = &tcp_syn_linear_timeouts_max,
1487         },
1488         {
1489                 .procname       = "tcp_shrink_window",
1490                 .data           = &init_net.ipv4.sysctl_tcp_shrink_window,
1491                 .maxlen         = sizeof(u8),
1492                 .mode           = 0644,
1493                 .proc_handler   = proc_dou8vec_minmax,
1494                 .extra1         = SYSCTL_ZERO,
1495                 .extra2         = SYSCTL_ONE,
1496         },
1497         {
1498                 .procname       = "tcp_pingpong_thresh",
1499                 .data           = &init_net.ipv4.sysctl_tcp_pingpong_thresh,
1500                 .maxlen         = sizeof(u8),
1501                 .mode           = 0644,
1502                 .proc_handler   = proc_dou8vec_minmax,
1503                 .extra1         = SYSCTL_ONE,
1504         },
1505         { }
1506 };
1507
1508 static __net_init int ipv4_sysctl_init_net(struct net *net)
1509 {
1510         struct ctl_table *table;
1511
1512         table = ipv4_net_table;
1513         if (!net_eq(net, &init_net)) {
1514                 int i;
1515
1516                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1517                 if (!table)
1518                         goto err_alloc;
1519
1520                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1521                         if (table[i].data) {
1522                                 /* Update the variables to point into
1523                                  * the current struct net
1524                                  */
1525                                 table[i].data += (void *)net - (void *)&init_net;
1526                         } else {
1527                                 /* Entries without data pointer are global;
1528                                  * Make them read-only in non-init_net ns
1529                                  */
1530                                 table[i].mode &= ~0222;
1531                         }
1532                 }
1533         }
1534
1535         net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table,
1536                                                     ARRAY_SIZE(ipv4_net_table));
1537         if (!net->ipv4.ipv4_hdr)
1538                 goto err_reg;
1539
1540         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1541         if (!net->ipv4.sysctl_local_reserved_ports)
1542                 goto err_ports;
1543
1544         return 0;
1545
1546 err_ports:
1547         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1548 err_reg:
1549         if (!net_eq(net, &init_net))
1550                 kfree(table);
1551 err_alloc:
1552         return -ENOMEM;
1553 }
1554
1555 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1556 {
1557         struct ctl_table *table;
1558
1559         kfree(net->ipv4.sysctl_local_reserved_ports);
1560         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1561         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1562         kfree(table);
1563 }
1564
1565 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1566         .init = ipv4_sysctl_init_net,
1567         .exit = ipv4_sysctl_exit_net,
1568 };
1569
1570 static __init int sysctl_ipv4_init(void)
1571 {
1572         struct ctl_table_header *hdr;
1573
1574         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1575         if (!hdr)
1576                 return -ENOMEM;
1577
1578         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1579                 unregister_net_sysctl_table(hdr);
1580                 return -ENOMEM;
1581         }
1582
1583         return 0;
1584 }
1585
1586 __initcall(sysctl_ipv4_init);