net/ipv4/sysctl_net_ipv4.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   4  *
   5  * Begun April 1, 1996, Mike Shaver.
   6  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   7  */
   8
   9 #include <linux/sysctl.h>
  10 #include <linux/seqlock.h>
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <net/icmp.h>
  14 #include <net/ip.h>
  15 #include <net/ip_fib.h>
  16 #include <net/tcp.h>
  17 #include <net/udp.h>
  18 #include <net/cipso_ipv4.h>
  19 #include <net/ping.h>
  20 #include <net/protocol.h>
  21 #include <net/netevent.h>
  22
  23 static int tcp_retr1_max = 255;
  24 static int ip_local_port_range_min[] = { 1, 1 };
  25 static int ip_local_port_range_max[] = { 65535, 65535 };
  26 static int tcp_adv_win_scale_min = -31;
  27 static int tcp_adv_win_scale_max = 31;
  28 static int tcp_app_win_max = 31;
  29 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  30 static int tcp_min_snd_mss_max = 65535;
  31 static int ip_privileged_port_min;
  32 static int ip_privileged_port_max = 65535;
  33 static int ip_ttl_min = 1;
  34 static int ip_ttl_max = 255;
  35 static int tcp_syn_retries_min = 1;
  36 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  37 static unsigned long ip_ping_group_range_min[] = { 0, 0 };
  38 static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  39 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  40 static int one_day_secs = 24 * 3600;
  41 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
  42         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
  43 static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024;
  44
  45 /* obsolete */
  46 static int sysctl_tcp_low_latency __read_mostly;
  47
  48 /* Update system visible IP port range */
  49 static void set_local_port_range(struct net *net, int range[2])
  50 {
  51         bool same_parity = !((range[0] ^ range[1]) & 1);
  52
  53         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  54         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  55                 net->ipv4.ip_local_ports.warned = true;
  56                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  57         }
  58         net->ipv4.ip_local_ports.range[0] = range[0];
  59         net->ipv4.ip_local_ports.range[1] = range[1];
  60         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  61 }
  62
  63 /* Validate changes from /proc interface. */
  64 static int ipv4_local_port_range(struct ctl_table *table, int write,
  65                                  void *buffer, size_t *lenp, loff_t *ppos)
  66 {
  67         struct net *net =
  68                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  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);
  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         tbl.data = &tcp_ehash_entries;
 405         tbl.maxlen = sizeof(int);
 406
 407         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
 408 }
 409
 410 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 411 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 412                                           void *buffer, size_t *lenp,
 413                                           loff_t *ppos)
 414 {
 415         struct net *net = container_of(table->data, struct net,
 416             ipv4.sysctl_fib_multipath_hash_policy);
 417         int ret;
 418
 419         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 420         if (write && ret == 0)
 421                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 422
 423         return ret;
 424 }
 425
 426 static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write,
 427                                           void *buffer, size_t *lenp,
 428                                           loff_t *ppos)
 429 {
 430         struct net *net;
 431         int ret;
 432
 433         net = container_of(table->data, struct net,
 434                            ipv4.sysctl_fib_multipath_hash_fields);
 435         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
 436         if (write && ret == 0)
 437                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 438
 439         return ret;
 440 }
 441 #endif
 442
 443 static struct ctl_table ipv4_table[] = {
 444         {
 445                 .procname       = "tcp_max_orphans",
 446                 .data           = &sysctl_tcp_max_orphans,
 447                 .maxlen         = sizeof(int),
 448                 .mode           = 0644,
 449                 .proc_handler   = proc_dointvec
 450         },
 451         {
 452                 .procname       = "inet_peer_threshold",
 453                 .data           = &inet_peer_threshold,
 454                 .maxlen         = sizeof(int),
 455                 .mode           = 0644,
 456                 .proc_handler   = proc_dointvec
 457         },
 458         {
 459                 .procname       = "inet_peer_minttl",
 460                 .data           = &inet_peer_minttl,
 461                 .maxlen         = sizeof(int),
 462                 .mode           = 0644,
 463                 .proc_handler   = proc_dointvec_jiffies,
 464         },
 465         {
 466                 .procname       = "inet_peer_maxttl",
 467                 .data           = &inet_peer_maxttl,
 468                 .maxlen         = sizeof(int),
 469                 .mode           = 0644,
 470                 .proc_handler   = proc_dointvec_jiffies,
 471         },
 472         {
 473                 .procname       = "tcp_mem",
 474                 .maxlen         = sizeof(sysctl_tcp_mem),
 475                 .data           = &sysctl_tcp_mem,
 476                 .mode           = 0644,
 477                 .proc_handler   = proc_doulongvec_minmax,
 478         },
 479         {
 480                 .procname       = "tcp_low_latency",
 481                 .data           = &sysctl_tcp_low_latency,
 482                 .maxlen         = sizeof(int),
 483                 .mode           = 0644,
 484                 .proc_handler   = proc_dointvec
 485         },
 486 #ifdef CONFIG_NETLABEL
 487         {
 488                 .procname       = "cipso_cache_enable",
 489                 .data           = &cipso_v4_cache_enabled,
 490                 .maxlen         = sizeof(int),
 491                 .mode           = 0644,
 492                 .proc_handler   = proc_dointvec,
 493         },
 494         {
 495                 .procname       = "cipso_cache_bucket_size",
 496                 .data           = &cipso_v4_cache_bucketsize,
 497                 .maxlen         = sizeof(int),
 498                 .mode           = 0644,
 499                 .proc_handler   = proc_dointvec,
 500         },
 501         {
 502                 .procname       = "cipso_rbm_optfmt",
 503                 .data           = &cipso_v4_rbm_optfmt,
 504                 .maxlen         = sizeof(int),
 505                 .mode           = 0644,
 506                 .proc_handler   = proc_dointvec,
 507         },
 508         {
 509                 .procname       = "cipso_rbm_strictvalid",
 510                 .data           = &cipso_v4_rbm_strictvalid,
 511                 .maxlen         = sizeof(int),
 512                 .mode           = 0644,
 513                 .proc_handler   = proc_dointvec,
 514         },
 515 #endif /* CONFIG_NETLABEL */
 516         {
 517                 .procname       = "tcp_available_ulp",
 518                 .maxlen         = TCP_ULP_BUF_MAX,
 519                 .mode           = 0444,
 520                 .proc_handler   = proc_tcp_available_ulp,
 521         },
 522         {
 523                 .procname       = "icmp_msgs_per_sec",
 524                 .data           = &sysctl_icmp_msgs_per_sec,
 525                 .maxlen         = sizeof(int),
 526                 .mode           = 0644,
 527                 .proc_handler   = proc_dointvec_minmax,
 528                 .extra1         = SYSCTL_ZERO,
 529         },
 530         {
 531                 .procname       = "icmp_msgs_burst",
 532                 .data           = &sysctl_icmp_msgs_burst,
 533                 .maxlen         = sizeof(int),
 534                 .mode           = 0644,
 535                 .proc_handler   = proc_dointvec_minmax,
 536                 .extra1         = SYSCTL_ZERO,
 537         },
 538         {
 539                 .procname       = "udp_mem",
 540                 .data           = &sysctl_udp_mem,
 541                 .maxlen         = sizeof(sysctl_udp_mem),
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_doulongvec_minmax,
 544         },
 545         {
 546                 .procname       = "fib_sync_mem",
 547                 .data           = &sysctl_fib_sync_mem,
 548                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_douintvec_minmax,
 551                 .extra1         = &sysctl_fib_sync_mem_min,
 552                 .extra2         = &sysctl_fib_sync_mem_max,
 553         },
 554         { }
 555 };
 556
 557 static struct ctl_table ipv4_net_table[] = {
 558         {
 559                 .procname       = "tcp_max_tw_buckets",
 560                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = proc_dointvec
 564         },
 565         {
 566                 .procname       = "icmp_echo_ignore_all",
 567                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 568                 .maxlen         = sizeof(u8),
 569                 .mode           = 0644,
 570                 .proc_handler   = proc_dou8vec_minmax,
 571                 .extra1         = SYSCTL_ZERO,
 572                 .extra2         = SYSCTL_ONE
 573         },
 574         {
 575                 .procname       = "icmp_echo_enable_probe",
 576                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 577                 .maxlen         = sizeof(u8),
 578                 .mode           = 0644,
 579                 .proc_handler   = proc_dou8vec_minmax,
 580                 .extra1         = SYSCTL_ZERO,
 581                 .extra2         = SYSCTL_ONE
 582         },
 583         {
 584                 .procname       = "icmp_echo_ignore_broadcasts",
 585                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 586                 .maxlen         = sizeof(u8),
 587                 .mode           = 0644,
 588                 .proc_handler   = proc_dou8vec_minmax,
 589                 .extra1         = SYSCTL_ZERO,
 590                 .extra2         = SYSCTL_ONE
 591         },
 592         {
 593                 .procname       = "icmp_ignore_bogus_error_responses",
 594                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 595                 .maxlen         = sizeof(u8),
 596                 .mode           = 0644,
 597                 .proc_handler   = proc_dou8vec_minmax,
 598                 .extra1         = SYSCTL_ZERO,
 599                 .extra2         = SYSCTL_ONE
 600         },
 601         {
 602                 .procname       = "icmp_errors_use_inbound_ifaddr",
 603                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 604                 .maxlen         = sizeof(u8),
 605                 .mode           = 0644,
 606                 .proc_handler   = proc_dou8vec_minmax,
 607                 .extra1         = SYSCTL_ZERO,
 608                 .extra2         = SYSCTL_ONE
 609         },
 610         {
 611                 .procname       = "icmp_ratelimit",
 612                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = proc_dointvec_ms_jiffies,
 616         },
 617         {
 618                 .procname       = "icmp_ratemask",
 619                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 620                 .maxlen         = sizeof(int),
 621                 .mode           = 0644,
 622                 .proc_handler   = proc_dointvec
 623         },
 624         {
 625                 .procname       = "ping_group_range",
 626                 .data           = &init_net.ipv4.ping_group_range.range,
 627                 .maxlen         = sizeof(gid_t)*2,
 628                 .mode           = 0644,
 629                 .proc_handler   = ipv4_ping_group_range,
 630         },
 631 #ifdef CONFIG_NET_L3_MASTER_DEV
 632         {
 633                 .procname       = "raw_l3mdev_accept",
 634                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 635                 .maxlen         = sizeof(u8),
 636                 .mode           = 0644,
 637                 .proc_handler   = proc_dou8vec_minmax,
 638                 .extra1         = SYSCTL_ZERO,
 639                 .extra2         = SYSCTL_ONE,
 640         },
 641 #endif
 642         {
 643                 .procname       = "tcp_ecn",
 644                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 645                 .maxlen         = sizeof(u8),
 646                 .mode           = 0644,
 647                 .proc_handler   = proc_dou8vec_minmax,
 648                 .extra1         = SYSCTL_ZERO,
 649                 .extra2         = SYSCTL_TWO,
 650         },
 651         {
 652                 .procname       = "tcp_ecn_fallback",
 653                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 654                 .maxlen         = sizeof(u8),
 655                 .mode           = 0644,
 656                 .proc_handler   = proc_dou8vec_minmax,
 657                 .extra1         = SYSCTL_ZERO,
 658                 .extra2         = SYSCTL_ONE,
 659         },
 660         {
 661                 .procname       = "ip_dynaddr",
 662                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 663                 .maxlen         = sizeof(u8),
 664                 .mode           = 0644,
 665                 .proc_handler   = proc_dou8vec_minmax,
 666         },
 667         {
 668                 .procname       = "ip_early_demux",
 669                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 670                 .maxlen         = sizeof(u8),
 671                 .mode           = 0644,
 672                 .proc_handler   = proc_dou8vec_minmax,
 673         },
 674         {
 675                 .procname       = "udp_early_demux",
 676                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 677                 .maxlen         = sizeof(u8),
 678                 .mode           = 0644,
 679                 .proc_handler   = proc_dou8vec_minmax,
 680         },
 681         {
 682                 .procname       = "tcp_early_demux",
 683                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 684                 .maxlen         = sizeof(u8),
 685                 .mode           = 0644,
 686                 .proc_handler   = proc_dou8vec_minmax,
 687         },
 688         {
 689                 .procname       = "nexthop_compat_mode",
 690                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 691                 .maxlen         = sizeof(u8),
 692                 .mode           = 0644,
 693                 .proc_handler   = proc_dou8vec_minmax,
 694                 .extra1         = SYSCTL_ZERO,
 695                 .extra2         = SYSCTL_ONE,
 696         },
 697         {
 698                 .procname       = "ip_default_ttl",
 699                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 700                 .maxlen         = sizeof(u8),
 701                 .mode           = 0644,
 702                 .proc_handler   = proc_dou8vec_minmax,
 703                 .extra1         = &ip_ttl_min,
 704                 .extra2         = &ip_ttl_max,
 705         },
 706         {
 707                 .procname       = "ip_local_port_range",
 708                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 709                 .data           = &init_net.ipv4.ip_local_ports.range,
 710                 .mode           = 0644,
 711                 .proc_handler   = ipv4_local_port_range,
 712         },
 713         {
 714                 .procname       = "ip_local_reserved_ports",
 715                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 716                 .maxlen         = 65536,
 717                 .mode           = 0644,
 718                 .proc_handler   = proc_do_large_bitmap,
 719         },
 720         {
 721                 .procname       = "ip_no_pmtu_disc",
 722                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 723                 .maxlen         = sizeof(u8),
 724                 .mode           = 0644,
 725                 .proc_handler   = proc_dou8vec_minmax,
 726         },
 727         {
 728                 .procname       = "ip_forward_use_pmtu",
 729                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 730                 .maxlen         = sizeof(u8),
 731                 .mode           = 0644,
 732                 .proc_handler   = proc_dou8vec_minmax,
 733         },
 734         {
 735                 .procname       = "ip_forward_update_priority",
 736                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 737                 .maxlen         = sizeof(u8),
 738                 .mode           = 0644,
 739                 .proc_handler   = ipv4_fwd_update_priority,
 740                 .extra1         = SYSCTL_ZERO,
 741                 .extra2         = SYSCTL_ONE,
 742         },
 743         {
 744                 .procname       = "ip_nonlocal_bind",
 745                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 746                 .maxlen         = sizeof(u8),
 747                 .mode           = 0644,
 748                 .proc_handler   = proc_dou8vec_minmax,
 749         },
 750         {
 751                 .procname       = "ip_autobind_reuse",
 752                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 753                 .maxlen         = sizeof(u8),
 754                 .mode           = 0644,
 755                 .proc_handler   = proc_dou8vec_minmax,
 756                 .extra1         = SYSCTL_ZERO,
 757                 .extra2         = SYSCTL_ONE,
 758         },
 759         {
 760                 .procname       = "fwmark_reflect",
 761                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 762                 .maxlen         = sizeof(u8),
 763                 .mode           = 0644,
 764                 .proc_handler   = proc_dou8vec_minmax,
 765         },
 766         {
 767                 .procname       = "tcp_fwmark_accept",
 768                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 769                 .maxlen         = sizeof(u8),
 770                 .mode           = 0644,
 771                 .proc_handler   = proc_dou8vec_minmax,
 772         },
 773 #ifdef CONFIG_NET_L3_MASTER_DEV
 774         {
 775                 .procname       = "tcp_l3mdev_accept",
 776                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 777                 .maxlen         = sizeof(u8),
 778                 .mode           = 0644,
 779                 .proc_handler   = proc_dou8vec_minmax,
 780                 .extra1         = SYSCTL_ZERO,
 781                 .extra2         = SYSCTL_ONE,
 782         },
 783 #endif
 784         {
 785                 .procname       = "tcp_mtu_probing",
 786                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 787                 .maxlen         = sizeof(u8),
 788                 .mode           = 0644,
 789                 .proc_handler   = proc_dou8vec_minmax,
 790         },
 791         {
 792                 .procname       = "tcp_base_mss",
 793                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 794                 .maxlen         = sizeof(int),
 795                 .mode           = 0644,
 796                 .proc_handler   = proc_dointvec,
 797         },
 798         {
 799                 .procname       = "tcp_min_snd_mss",
 800                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 801                 .maxlen         = sizeof(int),
 802                 .mode           = 0644,
 803                 .proc_handler   = proc_dointvec_minmax,
 804                 .extra1         = &tcp_min_snd_mss_min,
 805                 .extra2         = &tcp_min_snd_mss_max,
 806         },
 807         {
 808                 .procname       = "tcp_mtu_probe_floor",
 809                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 810                 .maxlen         = sizeof(int),
 811                 .mode           = 0644,
 812                 .proc_handler   = proc_dointvec_minmax,
 813                 .extra1         = &tcp_min_snd_mss_min,
 814                 .extra2         = &tcp_min_snd_mss_max,
 815         },
 816         {
 817                 .procname       = "tcp_probe_threshold",
 818                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 819                 .maxlen         = sizeof(int),
 820                 .mode           = 0644,
 821                 .proc_handler   = proc_dointvec,
 822         },
 823         {
 824                 .procname       = "tcp_probe_interval",
 825                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 826                 .maxlen         = sizeof(u32),
 827                 .mode           = 0644,
 828                 .proc_handler   = proc_douintvec_minmax,
 829                 .extra2         = &u32_max_div_HZ,
 830         },
 831         {
 832                 .procname       = "igmp_link_local_mcast_reports",
 833                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 834                 .maxlen         = sizeof(u8),
 835                 .mode           = 0644,
 836                 .proc_handler   = proc_dou8vec_minmax,
 837         },
 838         {
 839                 .procname       = "igmp_max_memberships",
 840                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 841                 .maxlen         = sizeof(int),
 842                 .mode           = 0644,
 843                 .proc_handler   = proc_dointvec
 844         },
 845         {
 846                 .procname       = "igmp_max_msf",
 847                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 848                 .maxlen         = sizeof(int),
 849                 .mode           = 0644,
 850                 .proc_handler   = proc_dointvec
 851         },
 852 #ifdef CONFIG_IP_MULTICAST
 853         {
 854                 .procname       = "igmp_qrv",
 855                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 856                 .maxlen         = sizeof(int),
 857                 .mode           = 0644,
 858                 .proc_handler   = proc_dointvec_minmax,
 859                 .extra1         = SYSCTL_ONE
 860         },
 861 #endif
 862         {
 863                 .procname       = "tcp_congestion_control",
 864                 .data           = &init_net.ipv4.tcp_congestion_control,
 865                 .mode           = 0644,
 866                 .maxlen         = TCP_CA_NAME_MAX,
 867                 .proc_handler   = proc_tcp_congestion_control,
 868         },
 869         {
 870                 .procname       = "tcp_available_congestion_control",
 871                 .maxlen         = TCP_CA_BUF_MAX,
 872                 .mode           = 0444,
 873                 .proc_handler   = proc_tcp_available_congestion_control,
 874         },
 875         {
 876                 .procname       = "tcp_allowed_congestion_control",
 877                 .maxlen         = TCP_CA_BUF_MAX,
 878                 .mode           = 0644,
 879                 .proc_handler   = proc_allowed_congestion_control,
 880         },
 881         {
 882                 .procname       = "tcp_keepalive_time",
 883                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 884                 .maxlen         = sizeof(int),
 885                 .mode           = 0644,
 886                 .proc_handler   = proc_dointvec_jiffies,
 887         },
 888         {
 889                 .procname       = "tcp_keepalive_probes",
 890                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 891                 .maxlen         = sizeof(u8),
 892                 .mode           = 0644,
 893                 .proc_handler   = proc_dou8vec_minmax,
 894         },
 895         {
 896                 .procname       = "tcp_keepalive_intvl",
 897                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 898                 .maxlen         = sizeof(int),
 899                 .mode           = 0644,
 900                 .proc_handler   = proc_dointvec_jiffies,
 901         },
 902         {
 903                 .procname       = "tcp_syn_retries",
 904                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 905                 .maxlen         = sizeof(u8),
 906                 .mode           = 0644,
 907                 .proc_handler   = proc_dou8vec_minmax,
 908                 .extra1         = &tcp_syn_retries_min,
 909                 .extra2         = &tcp_syn_retries_max
 910         },
 911         {
 912                 .procname       = "tcp_synack_retries",
 913                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 914                 .maxlen         = sizeof(u8),
 915                 .mode           = 0644,
 916                 .proc_handler   = proc_dou8vec_minmax,
 917         },
 918 #ifdef CONFIG_SYN_COOKIES
 919         {
 920                 .procname       = "tcp_syncookies",
 921                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 922                 .maxlen         = sizeof(u8),
 923                 .mode           = 0644,
 924                 .proc_handler   = proc_dou8vec_minmax,
 925         },
 926 #endif
 927         {
 928                 .procname       = "tcp_migrate_req",
 929                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 930                 .maxlen         = sizeof(u8),
 931                 .mode           = 0644,
 932                 .proc_handler   = proc_dou8vec_minmax,
 933                 .extra1         = SYSCTL_ZERO,
 934                 .extra2         = SYSCTL_ONE
 935         },
 936         {
 937                 .procname       = "tcp_reordering",
 938                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 939                 .maxlen         = sizeof(int),
 940                 .mode           = 0644,
 941                 .proc_handler   = proc_dointvec
 942         },
 943         {
 944                 .procname       = "tcp_retries1",
 945                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 946                 .maxlen         = sizeof(u8),
 947                 .mode           = 0644,
 948                 .proc_handler   = proc_dou8vec_minmax,
 949                 .extra2         = &tcp_retr1_max
 950         },
 951         {
 952                 .procname       = "tcp_retries2",
 953                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 954                 .maxlen         = sizeof(u8),
 955                 .mode           = 0644,
 956                 .proc_handler   = proc_dou8vec_minmax,
 957         },
 958         {
 959                 .procname       = "tcp_orphan_retries",
 960                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 961                 .maxlen         = sizeof(u8),
 962                 .mode           = 0644,
 963                 .proc_handler   = proc_dou8vec_minmax,
 964         },
 965         {
 966                 .procname       = "tcp_fin_timeout",
 967                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 968                 .maxlen         = sizeof(int),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_dointvec_jiffies,
 971         },
 972         {
 973                 .procname       = "tcp_notsent_lowat",
 974                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 975                 .maxlen         = sizeof(unsigned int),
 976                 .mode           = 0644,
 977                 .proc_handler   = proc_douintvec,
 978         },
 979         {
 980                 .procname       = "tcp_tw_reuse",
 981                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 982                 .maxlen         = sizeof(u8),
 983                 .mode           = 0644,
 984                 .proc_handler   = proc_dou8vec_minmax,
 985                 .extra1         = SYSCTL_ZERO,
 986                 .extra2         = SYSCTL_TWO,
 987         },
 988         {
 989                 .procname       = "tcp_max_syn_backlog",
 990                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 991                 .maxlen         = sizeof(int),
 992                 .mode           = 0644,
 993                 .proc_handler   = proc_dointvec
 994         },
 995         {
 996                 .procname       = "tcp_fastopen",
 997                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 998                 .maxlen         = sizeof(int),
 999                 .mode           = 0644,
1000                 .proc_handler   = proc_dointvec,
1001         },
1002         {
1003                 .procname       = "tcp_fastopen_key",
1004                 .mode           = 0600,
1005                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1006                 /* maxlen to print the list of keys in hex (*2), with dashes
1007                  * separating doublewords and a comma in between keys.
1008                  */
1009                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1010                                    2 * TCP_FASTOPEN_KEY_MAX) +
1011                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1012                 .proc_handler   = proc_tcp_fastopen_key,
1013         },
1014         {
1015                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1016                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1017                 .maxlen         = sizeof(int),
1018                 .mode           = 0644,
1019                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1020                 .extra1         = SYSCTL_ZERO,
1021         },
1022 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1023         {
1024                 .procname       = "fib_multipath_use_neigh",
1025                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1026                 .maxlen         = sizeof(u8),
1027                 .mode           = 0644,
1028                 .proc_handler   = proc_dou8vec_minmax,
1029                 .extra1         = SYSCTL_ZERO,
1030                 .extra2         = SYSCTL_ONE,
1031         },
1032         {
1033                 .procname       = "fib_multipath_hash_policy",
1034                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1035                 .maxlen         = sizeof(u8),
1036                 .mode           = 0644,
1037                 .proc_handler   = proc_fib_multipath_hash_policy,
1038                 .extra1         = SYSCTL_ZERO,
1039                 .extra2         = SYSCTL_THREE,
1040         },
1041         {
1042                 .procname       = "fib_multipath_hash_fields",
1043                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1044                 .maxlen         = sizeof(u32),
1045                 .mode           = 0644,
1046                 .proc_handler   = proc_fib_multipath_hash_fields,
1047                 .extra1         = SYSCTL_ONE,
1048                 .extra2         = &fib_multipath_hash_fields_all_mask,
1049         },
1050 #endif
1051         {
1052                 .procname       = "ip_unprivileged_port_start",
1053                 .maxlen         = sizeof(int),
1054                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1055                 .mode           = 0644,
1056                 .proc_handler   = ipv4_privileged_ports,
1057         },
1058 #ifdef CONFIG_NET_L3_MASTER_DEV
1059         {
1060                 .procname       = "udp_l3mdev_accept",
1061                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1062                 .maxlen         = sizeof(u8),
1063                 .mode           = 0644,
1064                 .proc_handler   = proc_dou8vec_minmax,
1065                 .extra1         = SYSCTL_ZERO,
1066                 .extra2         = SYSCTL_ONE,
1067         },
1068 #endif
1069         {
1070                 .procname       = "tcp_sack",
1071                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1072                 .maxlen         = sizeof(u8),
1073                 .mode           = 0644,
1074                 .proc_handler   = proc_dou8vec_minmax,
1075         },
1076         {
1077                 .procname       = "tcp_window_scaling",
1078                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1079                 .maxlen         = sizeof(u8),
1080                 .mode           = 0644,
1081                 .proc_handler   = proc_dou8vec_minmax,
1082         },
1083         {
1084                 .procname       = "tcp_timestamps",
1085                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1086                 .maxlen         = sizeof(u8),
1087                 .mode           = 0644,
1088                 .proc_handler   = proc_dou8vec_minmax,
1089         },
1090         {
1091                 .procname       = "tcp_early_retrans",
1092                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1093                 .maxlen         = sizeof(u8),
1094                 .mode           = 0644,
1095                 .proc_handler   = proc_dou8vec_minmax,
1096                 .extra1         = SYSCTL_ZERO,
1097                 .extra2         = SYSCTL_FOUR,
1098         },
1099         {
1100                 .procname       = "tcp_recovery",
1101                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1102                 .maxlen         = sizeof(u8),
1103                 .mode           = 0644,
1104                 .proc_handler   = proc_dou8vec_minmax,
1105         },
1106         {
1107                 .procname       = "tcp_thin_linear_timeouts",
1108                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1109                 .maxlen         = sizeof(u8),
1110                 .mode           = 0644,
1111                 .proc_handler   = proc_dou8vec_minmax,
1112         },
1113         {
1114                 .procname       = "tcp_slow_start_after_idle",
1115                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1116                 .maxlen         = sizeof(u8),
1117                 .mode           = 0644,
1118                 .proc_handler   = proc_dou8vec_minmax,
1119         },
1120         {
1121                 .procname       = "tcp_retrans_collapse",
1122                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1123                 .maxlen         = sizeof(u8),
1124                 .mode           = 0644,
1125                 .proc_handler   = proc_dou8vec_minmax,
1126         },
1127         {
1128                 .procname       = "tcp_stdurg",
1129                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1130                 .maxlen         = sizeof(u8),
1131                 .mode           = 0644,
1132                 .proc_handler   = proc_dou8vec_minmax,
1133         },
1134         {
1135                 .procname       = "tcp_rfc1337",
1136                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1137                 .maxlen         = sizeof(u8),
1138                 .mode           = 0644,
1139                 .proc_handler   = proc_dou8vec_minmax,
1140         },
1141         {
1142                 .procname       = "tcp_abort_on_overflow",
1143                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1144                 .maxlen         = sizeof(u8),
1145                 .mode           = 0644,
1146                 .proc_handler   = proc_dou8vec_minmax,
1147         },
1148         {
1149                 .procname       = "tcp_fack",
1150                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1151                 .maxlen         = sizeof(u8),
1152                 .mode           = 0644,
1153                 .proc_handler   = proc_dou8vec_minmax,
1154         },
1155         {
1156                 .procname       = "tcp_max_reordering",
1157                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1158                 .maxlen         = sizeof(int),
1159                 .mode           = 0644,
1160                 .proc_handler   = proc_dointvec
1161         },
1162         {
1163                 .procname       = "tcp_dsack",
1164                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1165                 .maxlen         = sizeof(u8),
1166                 .mode           = 0644,
1167                 .proc_handler   = proc_dou8vec_minmax,
1168         },
1169         {
1170                 .procname       = "tcp_app_win",
1171                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1172                 .maxlen         = sizeof(u8),
1173                 .mode           = 0644,
1174                 .proc_handler   = proc_dou8vec_minmax,
1175                 .extra1         = SYSCTL_ZERO,
1176                 .extra2         = &tcp_app_win_max,
1177         },
1178         {
1179                 .procname       = "tcp_adv_win_scale",
1180                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1181                 .maxlen         = sizeof(int),
1182                 .mode           = 0644,
1183                 .proc_handler   = proc_dointvec_minmax,
1184                 .extra1         = &tcp_adv_win_scale_min,
1185                 .extra2         = &tcp_adv_win_scale_max,
1186         },
1187         {
1188                 .procname       = "tcp_frto",
1189                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1190                 .maxlen         = sizeof(u8),
1191                 .mode           = 0644,
1192                 .proc_handler   = proc_dou8vec_minmax,
1193         },
1194         {
1195                 .procname       = "tcp_no_metrics_save",
1196                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1197                 .maxlen         = sizeof(u8),
1198                 .mode           = 0644,
1199                 .proc_handler   = proc_dou8vec_minmax,
1200         },
1201         {
1202                 .procname       = "tcp_no_ssthresh_metrics_save",
1203                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1204                 .maxlen         = sizeof(u8),
1205                 .mode           = 0644,
1206                 .proc_handler   = proc_dou8vec_minmax,
1207                 .extra1         = SYSCTL_ZERO,
1208                 .extra2         = SYSCTL_ONE,
1209         },
1210         {
1211                 .procname       = "tcp_moderate_rcvbuf",
1212                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1213                 .maxlen         = sizeof(u8),
1214                 .mode           = 0644,
1215                 .proc_handler   = proc_dou8vec_minmax,
1216         },
1217         {
1218                 .procname       = "tcp_tso_win_divisor",
1219                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1220                 .maxlen         = sizeof(u8),
1221                 .mode           = 0644,
1222                 .proc_handler   = proc_dou8vec_minmax,
1223         },
1224         {
1225                 .procname       = "tcp_workaround_signed_windows",
1226                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1227                 .maxlen         = sizeof(u8),
1228                 .mode           = 0644,
1229                 .proc_handler   = proc_dou8vec_minmax,
1230         },
1231         {
1232                 .procname       = "tcp_limit_output_bytes",
1233                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1234                 .maxlen         = sizeof(int),
1235                 .mode           = 0644,
1236                 .proc_handler   = proc_dointvec
1237         },
1238         {
1239                 .procname       = "tcp_challenge_ack_limit",
1240                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1241                 .maxlen         = sizeof(int),
1242                 .mode           = 0644,
1243                 .proc_handler   = proc_dointvec
1244         },
1245         {
1246                 .procname       = "tcp_min_tso_segs",
1247                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1248                 .maxlen         = sizeof(u8),
1249                 .mode           = 0644,
1250                 .proc_handler   = proc_dou8vec_minmax,
1251                 .extra1         = SYSCTL_ONE,
1252         },
1253         {
1254                 .procname       = "tcp_tso_rtt_log",
1255                 .data           = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1256                 .maxlen         = sizeof(u8),
1257                 .mode           = 0644,
1258                 .proc_handler   = proc_dou8vec_minmax,
1259         },
1260         {
1261                 .procname       = "tcp_min_rtt_wlen",
1262                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1263                 .maxlen         = sizeof(int),
1264                 .mode           = 0644,
1265                 .proc_handler   = proc_dointvec_minmax,
1266                 .extra1         = SYSCTL_ZERO,
1267                 .extra2         = &one_day_secs
1268         },
1269         {
1270                 .procname       = "tcp_autocorking",
1271                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1272                 .maxlen         = sizeof(u8),
1273                 .mode           = 0644,
1274                 .proc_handler   = proc_dou8vec_minmax,
1275                 .extra1         = SYSCTL_ZERO,
1276                 .extra2         = SYSCTL_ONE,
1277         },
1278         {
1279                 .procname       = "tcp_invalid_ratelimit",
1280                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1281                 .maxlen         = sizeof(int),
1282                 .mode           = 0644,
1283                 .proc_handler   = proc_dointvec_ms_jiffies,
1284         },
1285         {
1286                 .procname       = "tcp_pacing_ss_ratio",
1287                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1288                 .maxlen         = sizeof(int),
1289                 .mode           = 0644,
1290                 .proc_handler   = proc_dointvec_minmax,
1291                 .extra1         = SYSCTL_ZERO,
1292                 .extra2         = SYSCTL_ONE_THOUSAND,
1293         },
1294         {
1295                 .procname       = "tcp_pacing_ca_ratio",
1296                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1297                 .maxlen         = sizeof(int),
1298                 .mode           = 0644,
1299                 .proc_handler   = proc_dointvec_minmax,
1300                 .extra1         = SYSCTL_ZERO,
1301                 .extra2         = SYSCTL_ONE_THOUSAND,
1302         },
1303         {
1304                 .procname       = "tcp_wmem",
1305                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1306                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1307                 .mode           = 0644,
1308                 .proc_handler   = proc_dointvec_minmax,
1309                 .extra1         = SYSCTL_ONE,
1310         },
1311         {
1312                 .procname       = "tcp_rmem",
1313                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1314                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1315                 .mode           = 0644,
1316                 .proc_handler   = proc_dointvec_minmax,
1317                 .extra1         = SYSCTL_ONE,
1318         },
1319         {
1320                 .procname       = "tcp_comp_sack_delay_ns",
1321                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1322                 .maxlen         = sizeof(unsigned long),
1323                 .mode           = 0644,
1324                 .proc_handler   = proc_doulongvec_minmax,
1325         },
1326         {
1327                 .procname       = "tcp_comp_sack_slack_ns",
1328                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1329                 .maxlen         = sizeof(unsigned long),
1330                 .mode           = 0644,
1331                 .proc_handler   = proc_doulongvec_minmax,
1332         },
1333         {
1334                 .procname       = "tcp_comp_sack_nr",
1335                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1336                 .maxlen         = sizeof(u8),
1337                 .mode           = 0644,
1338                 .proc_handler   = proc_dou8vec_minmax,
1339                 .extra1         = SYSCTL_ZERO,
1340         },
1341         {
1342                 .procname       = "tcp_reflect_tos",
1343                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1344                 .maxlen         = sizeof(u8),
1345                 .mode           = 0644,
1346                 .proc_handler   = proc_dou8vec_minmax,
1347                 .extra1         = SYSCTL_ZERO,
1348                 .extra2         = SYSCTL_ONE,
1349         },
1350         {
1351                 .procname       = "tcp_ehash_entries",
1352                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1353                 .mode           = 0444,
1354                 .proc_handler   = proc_tcp_ehash_entries,
1355         },
1356         {
1357                 .procname       = "tcp_child_ehash_entries",
1358                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1359                 .maxlen         = sizeof(unsigned int),
1360                 .mode           = 0644,
1361                 .proc_handler   = proc_douintvec_minmax,
1362                 .extra1         = SYSCTL_ZERO,
1363                 .extra2         = &tcp_child_ehash_entries_max,
1364         },
1365         {
1366                 .procname       = "udp_rmem_min",
1367                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1368                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1369                 .mode           = 0644,
1370                 .proc_handler   = proc_dointvec_minmax,
1371                 .extra1         = SYSCTL_ONE
1372         },
1373         {
1374                 .procname       = "udp_wmem_min",
1375                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1376                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1377                 .mode           = 0644,
1378                 .proc_handler   = proc_dointvec_minmax,
1379                 .extra1         = SYSCTL_ONE
1380         },
1381         {
1382                 .procname       = "fib_notify_on_flag_change",
1383                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1384                 .maxlen         = sizeof(u8),
1385                 .mode           = 0644,
1386                 .proc_handler   = proc_dou8vec_minmax,
1387                 .extra1         = SYSCTL_ZERO,
1388                 .extra2         = SYSCTL_TWO,
1389         },
1390         {
1391                 .procname       = "tcp_shrink_window",
1392                 .data           = &init_net.ipv4.sysctl_tcp_shrink_window,
1393                 .maxlen         = sizeof(u8),
1394                 .mode           = 0644,
1395                 .proc_handler   = proc_dou8vec_minmax,
1396                 .extra1         = SYSCTL_ZERO,
1397                 .extra2         = SYSCTL_ONE,
1398         },
1399         { }
1400 };
1401
1402 static __net_init int ipv4_sysctl_init_net(struct net *net)
1403 {
1404         struct ctl_table *table;
1405
1406         table = ipv4_net_table;
1407         if (!net_eq(net, &init_net)) {
1408                 int i;
1409
1410                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1411                 if (!table)
1412                         goto err_alloc;
1413
1414                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1415                         if (table[i].data) {
1416                                 /* Update the variables to point into
1417                                  * the current struct net
1418                                  */
1419                                 table[i].data += (void *)net - (void *)&init_net;
1420                         } else {
1421                                 /* Entries without data pointer are global;
1422                                  * Make them read-only in non-init_net ns
1423                                  */
1424                                 table[i].mode &= ~0222;
1425                         }
1426                 }
1427         }
1428
1429         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1430         if (!net->ipv4.ipv4_hdr)
1431                 goto err_reg;
1432
1433         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1434         if (!net->ipv4.sysctl_local_reserved_ports)
1435                 goto err_ports;
1436
1437         return 0;
1438
1439 err_ports:
1440         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1441 err_reg:
1442         if (!net_eq(net, &init_net))
1443                 kfree(table);
1444 err_alloc:
1445         return -ENOMEM;
1446 }
1447
1448 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1449 {
1450         struct ctl_table *table;
1451
1452         kfree(net->ipv4.sysctl_local_reserved_ports);
1453         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1454         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1455         kfree(table);
1456 }
1457
1458 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1459         .init = ipv4_sysctl_init_net,
1460         .exit = ipv4_sysctl_exit_net,
1461 };
1462
1463 static __init int sysctl_ipv4_init(void)
1464 {
1465         struct ctl_table_header *hdr;
1466
1467         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1468         if (!hdr)
1469                 return -ENOMEM;
1470
1471         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1472                 unregister_net_sysctl_table(hdr);
1473                 return -ENOMEM;
1474         }
1475
1476         return 0;
1477 }
1478
1479 __initcall(sysctl_ipv4_init);