net/ipv4/sysctl_net_ipv4.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   4  *
   5  * Begun April 1, 1996, Mike Shaver.
   6  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   7  */
   8
   9 #include <linux/sysctl.h>
  10 #include <linux/seqlock.h>
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <net/icmp.h>
  14 #include <net/ip.h>
  15 #include <net/ip_fib.h>
  16 #include <net/tcp.h>
  17 #include <net/udp.h>
  18 #include <net/cipso_ipv4.h>
  19 #include <net/ping.h>
  20 #include <net/protocol.h>
  21 #include <net/netevent.h>
  22
  23 static int tcp_retr1_max = 255;
  24 static int ip_local_port_range_min[] = { 1, 1 };
  25 static int ip_local_port_range_max[] = { 65535, 65535 };
  26 static int tcp_adv_win_scale_min = -31;
  27 static int tcp_adv_win_scale_max = 31;
  28 static int tcp_app_win_max = 31;
  29 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  30 static int tcp_min_snd_mss_max = 65535;
  31 static int ip_privileged_port_min;
  32 static int ip_privileged_port_max = 65535;
  33 static int ip_ttl_min = 1;
  34 static int ip_ttl_max = 255;
  35 static int tcp_syn_retries_min = 1;
  36 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  37 static int tcp_syn_linear_timeouts_max = MAX_TCP_SYNCNT;
  38 static unsigned long ip_ping_group_range_min[] = { 0, 0 };
  39 static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  40 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  41 static int one_day_secs = 24 * 3600;
  42 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
  43         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
  44 static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024;
  45 static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX;
  46 static int tcp_plb_max_rounds = 31;
  47 static int tcp_plb_max_cong_thresh = 256;
  48
  49 /* obsolete */
  50 static int sysctl_tcp_low_latency __read_mostly;
  51
  52 /* Update system visible IP port range */
  53 static void set_local_port_range(struct net *net, int range[2])
  54 {
  55         bool same_parity = !((range[0] ^ range[1]) & 1);
  56
  57         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  58         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  59                 net->ipv4.ip_local_ports.warned = true;
  60                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  61         }
  62         net->ipv4.ip_local_ports.range[0] = range[0];
  63         net->ipv4.ip_local_ports.range[1] = range[1];
  64         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  65 }
  66
  67 /* Validate changes from /proc interface. */
  68 static int ipv4_local_port_range(struct ctl_table *table, int write,
  69                                  void *buffer, size_t *lenp, loff_t *ppos)
  70 {
  71         struct net *net =
  72                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  73         int ret;
  74         int range[2];
  75         struct ctl_table tmp = {
  76                 .data = &range,
  77                 .maxlen = sizeof(range),
  78                 .mode = table->mode,
  79                 .extra1 = &ip_local_port_range_min,
  80                 .extra2 = &ip_local_port_range_max,
  81         };
  82
  83         inet_get_local_port_range(net, &range[0], &range[1]);
  84
  85         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  86
  87         if (write && ret == 0) {
  88                 /* Ensure that the upper limit is not smaller than the lower,
  89                  * and that the lower does not encroach upon the privileged
  90                  * port limit.
  91                  */
  92                 if ((range[1] < range[0]) ||
  93                     (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
  94                         ret = -EINVAL;
  95                 else
  96                         set_local_port_range(net, range);
  97         }
  98
  99         return ret;
 100 }
 101
 102 /* Validate changes from /proc interface. */
 103 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 104                                 void *buffer, size_t *lenp, loff_t *ppos)
 105 {
 106         struct net *net = container_of(table->data, struct net,
 107             ipv4.sysctl_ip_prot_sock);
 108         int ret;
 109         int pports;
 110         int range[2];
 111         struct ctl_table tmp = {
 112                 .data = &pports,
 113                 .maxlen = sizeof(pports),
 114                 .mode = table->mode,
 115                 .extra1 = &ip_privileged_port_min,
 116                 .extra2 = &ip_privileged_port_max,
 117         };
 118
 119         pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
 120
 121         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 122
 123         if (write && ret == 0) {
 124                 inet_get_local_port_range(net, &range[0], &range[1]);
 125                 /* Ensure that the local port range doesn't overlap with the
 126                  * privileged port range.
 127                  */
 128                 if (range[0] < pports)
 129                         ret = -EINVAL;
 130                 else
 131                         WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
 132         }
 133
 134         return ret;
 135 }
 136
 137 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 138 {
 139         kgid_t *data = table->data;
 140         struct net *net =
 141                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 142         unsigned int seq;
 143         do {
 144                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 145
 146                 *low = data[0];
 147                 *high = data[1];
 148         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 149 }
 150
 151 /* Update system visible IP port range */
 152 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 153 {
 154         kgid_t *data = table->data;
 155         struct net *net =
 156                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 157         write_seqlock(&net->ipv4.ping_group_range.lock);
 158         data[0] = low;
 159         data[1] = high;
 160         write_sequnlock(&net->ipv4.ping_group_range.lock);
 161 }
 162
 163 /* Validate changes from /proc interface. */
 164 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 165                                  void *buffer, size_t *lenp, loff_t *ppos)
 166 {
 167         struct user_namespace *user_ns = current_user_ns();
 168         int ret;
 169         unsigned long urange[2];
 170         kgid_t low, high;
 171         struct ctl_table tmp = {
 172                 .data = &urange,
 173                 .maxlen = sizeof(urange),
 174                 .mode = table->mode,
 175                 .extra1 = &ip_ping_group_range_min,
 176                 .extra2 = &ip_ping_group_range_max,
 177         };
 178
 179         inet_get_ping_group_range_table(table, &low, &high);
 180         urange[0] = from_kgid_munged(user_ns, low);
 181         urange[1] = from_kgid_munged(user_ns, high);
 182         ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
 183
 184         if (write && ret == 0) {
 185                 low = make_kgid(user_ns, urange[0]);
 186                 high = make_kgid(user_ns, urange[1]);
 187                 if (!gid_valid(low) || !gid_valid(high))
 188                         return -EINVAL;
 189                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 190                         low = make_kgid(&init_user_ns, 1);
 191                         high = make_kgid(&init_user_ns, 0);
 192                 }
 193                 set_ping_group_range(table, low, high);
 194         }
 195
 196         return ret;
 197 }
 198
 199 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 200                                     void *buffer, size_t *lenp, loff_t *ppos)
 201 {
 202         struct net *net;
 203         int ret;
 204
 205         net = container_of(table->data, struct net,
 206                            ipv4.sysctl_ip_fwd_update_priority);
 207         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 208         if (write && ret == 0)
 209                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 210                                         net);
 211
 212         return ret;
 213 }
 214
 215 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 216                                        void *buffer, size_t *lenp, loff_t *ppos)
 217 {
 218         struct net *net = container_of(ctl->data, struct net,
 219                                        ipv4.tcp_congestion_control);
 220         char val[TCP_CA_NAME_MAX];
 221         struct ctl_table tbl = {
 222                 .data = val,
 223                 .maxlen = TCP_CA_NAME_MAX,
 224         };
 225         int ret;
 226
 227         tcp_get_default_congestion_control(net, val);
 228
 229         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 230         if (write && ret == 0)
 231                 ret = tcp_set_default_congestion_control(net, val);
 232         return ret;
 233 }
 234
 235 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 236                                                  int write, void *buffer,
 237                                                  size_t *lenp, loff_t *ppos)
 238 {
 239         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 240         int ret;
 241
 242         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 243         if (!tbl.data)
 244                 return -ENOMEM;
 245         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 246         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 247         kfree(tbl.data);
 248         return ret;
 249 }
 250
 251 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 252                                            int write, void *buffer,
 253                                            size_t *lenp, loff_t *ppos)
 254 {
 255         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 256         int ret;
 257
 258         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 259         if (!tbl.data)
 260                 return -ENOMEM;
 261
 262         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 263         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 264         if (write && ret == 0)
 265                 ret = tcp_set_allowed_congestion_control(tbl.data);
 266         kfree(tbl.data);
 267         return ret;
 268 }
 269
 270 static int sscanf_key(char *buf, __le32 *key)
 271 {
 272         u32 user_key[4];
 273         int i, ret = 0;
 274
 275         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 276                    user_key + 2, user_key + 3) != 4) {
 277                 ret = -EINVAL;
 278         } else {
 279                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 280                         key[i] = cpu_to_le32(user_key[i]);
 281         }
 282         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 283                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 284
 285         return ret;
 286 }
 287
 288 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 289                                  void *buffer, size_t *lenp, loff_t *ppos)
 290 {
 291         struct net *net = container_of(table->data, struct net,
 292             ipv4.sysctl_tcp_fastopen);
 293         /* maxlen to print the list of keys in hex (*2), with dashes
 294          * separating doublewords and a comma in between keys.
 295          */
 296         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 297                                             2 * TCP_FASTOPEN_KEY_MAX) +
 298                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 299         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 300         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 301         char *backup_data;
 302         int ret, i = 0, off = 0, n_keys;
 303
 304         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 305         if (!tbl.data)
 306                 return -ENOMEM;
 307
 308         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 309         if (!n_keys) {
 310                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 311                 n_keys = 1;
 312         }
 313
 314         for (i = 0; i < n_keys * 4; i++)
 315                 user_key[i] = le32_to_cpu(key[i]);
 316
 317         for (i = 0; i < n_keys; i++) {
 318                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 319                                 "%08x-%08x-%08x-%08x",
 320                                 user_key[i * 4],
 321                                 user_key[i * 4 + 1],
 322                                 user_key[i * 4 + 2],
 323                                 user_key[i * 4 + 3]);
 324
 325                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 326                         break;
 327
 328                 if (i + 1 < n_keys)
 329                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 330         }
 331
 332         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 333
 334         if (write && ret == 0) {
 335                 backup_data = strchr(tbl.data, ',');
 336                 if (backup_data) {
 337                         *backup_data = '\0';
 338                         backup_data++;
 339                 }
 340                 if (sscanf_key(tbl.data, key)) {
 341                         ret = -EINVAL;
 342                         goto bad_key;
 343                 }
 344                 if (backup_data) {
 345                         if (sscanf_key(backup_data, key + 4)) {
 346                                 ret = -EINVAL;
 347                                 goto bad_key;
 348                         }
 349                 }
 350                 tcp_fastopen_reset_cipher(net, NULL, key,
 351                                           backup_data ? key + 4 : NULL);
 352         }
 353
 354 bad_key:
 355         kfree(tbl.data);
 356         return ret;
 357 }
 358
 359 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 360                                              int write, void *buffer,
 361                                              size_t *lenp, loff_t *ppos)
 362 {
 363         struct net *net = container_of(table->data, struct net,
 364             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 365         int ret;
 366
 367         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 368         if (write && ret == 0)
 369                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 370
 371         return ret;
 372 }
 373
 374 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 375                                   int write, void *buffer, size_t *lenp,
 376                                   loff_t *ppos)
 377 {
 378         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 379         int ret;
 380
 381         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 382         if (!tbl.data)
 383                 return -ENOMEM;
 384         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 385         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 386         kfree(tbl.data);
 387
 388         return ret;
 389 }
 390
 391 static int proc_tcp_ehash_entries(struct ctl_table *table, int write,
 392                                   void *buffer, size_t *lenp, loff_t *ppos)
 393 {
 394         struct net *net = container_of(table->data, struct net,
 395                                        ipv4.sysctl_tcp_child_ehash_entries);
 396         struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo;
 397         int tcp_ehash_entries;
 398         struct ctl_table tbl;
 399
 400         tcp_ehash_entries = hinfo->ehash_mask + 1;
 401
 402         /* A negative number indicates that the child netns
 403          * shares the global ehash.
 404          */
 405         if (!net_eq(net, &init_net) && !hinfo->pernet)
 406                 tcp_ehash_entries *= -1;
 407
 408         memset(&tbl, 0, sizeof(tbl));
 409         tbl.data = &tcp_ehash_entries;
 410         tbl.maxlen = sizeof(int);
 411
 412         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
 413 }
 414
 415 static int proc_udp_hash_entries(struct ctl_table *table, int write,
 416                                  void *buffer, size_t *lenp, loff_t *ppos)
 417 {
 418         struct net *net = container_of(table->data, struct net,
 419                                        ipv4.sysctl_udp_child_hash_entries);
 420         int udp_hash_entries;
 421         struct ctl_table tbl;
 422
 423         udp_hash_entries = net->ipv4.udp_table->mask + 1;
 424
 425         /* A negative number indicates that the child netns
 426          * shares the global udp_table.
 427          */
 428         if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table)
 429                 udp_hash_entries *= -1;
 430
 431         memset(&tbl, 0, sizeof(tbl));
 432         tbl.data = &udp_hash_entries;
 433         tbl.maxlen = sizeof(int);
 434
 435         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
 436 }
 437
 438 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 439 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 440                                           void *buffer, size_t *lenp,
 441                                           loff_t *ppos)
 442 {
 443         struct net *net = container_of(table->data, struct net,
 444             ipv4.sysctl_fib_multipath_hash_policy);
 445         int ret;
 446
 447         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 448         if (write && ret == 0)
 449                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 450
 451         return ret;
 452 }
 453
 454 static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write,
 455                                           void *buffer, size_t *lenp,
 456                                           loff_t *ppos)
 457 {
 458         struct net *net;
 459         int ret;
 460
 461         net = container_of(table->data, struct net,
 462                            ipv4.sysctl_fib_multipath_hash_fields);
 463         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
 464         if (write && ret == 0)
 465                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 466
 467         return ret;
 468 }
 469 #endif
 470
 471 static struct ctl_table ipv4_table[] = {
 472         {
 473                 .procname       = "tcp_max_orphans",
 474                 .data           = &sysctl_tcp_max_orphans,
 475                 .maxlen         = sizeof(int),
 476                 .mode           = 0644,
 477                 .proc_handler   = proc_dointvec
 478         },
 479         {
 480                 .procname       = "inet_peer_threshold",
 481                 .data           = &inet_peer_threshold,
 482                 .maxlen         = sizeof(int),
 483                 .mode           = 0644,
 484                 .proc_handler   = proc_dointvec
 485         },
 486         {
 487                 .procname       = "inet_peer_minttl",
 488                 .data           = &inet_peer_minttl,
 489                 .maxlen         = sizeof(int),
 490                 .mode           = 0644,
 491                 .proc_handler   = proc_dointvec_jiffies,
 492         },
 493         {
 494                 .procname       = "inet_peer_maxttl",
 495                 .data           = &inet_peer_maxttl,
 496                 .maxlen         = sizeof(int),
 497                 .mode           = 0644,
 498                 .proc_handler   = proc_dointvec_jiffies,
 499         },
 500         {
 501                 .procname       = "tcp_mem",
 502                 .maxlen         = sizeof(sysctl_tcp_mem),
 503                 .data           = &sysctl_tcp_mem,
 504                 .mode           = 0644,
 505                 .proc_handler   = proc_doulongvec_minmax,
 506         },
 507         {
 508                 .procname       = "tcp_low_latency",
 509                 .data           = &sysctl_tcp_low_latency,
 510                 .maxlen         = sizeof(int),
 511                 .mode           = 0644,
 512                 .proc_handler   = proc_dointvec
 513         },
 514 #ifdef CONFIG_NETLABEL
 515         {
 516                 .procname       = "cipso_cache_enable",
 517                 .data           = &cipso_v4_cache_enabled,
 518                 .maxlen         = sizeof(int),
 519                 .mode           = 0644,
 520                 .proc_handler   = proc_dointvec,
 521         },
 522         {
 523                 .procname       = "cipso_cache_bucket_size",
 524                 .data           = &cipso_v4_cache_bucketsize,
 525                 .maxlen         = sizeof(int),
 526                 .mode           = 0644,
 527                 .proc_handler   = proc_dointvec,
 528         },
 529         {
 530                 .procname       = "cipso_rbm_optfmt",
 531                 .data           = &cipso_v4_rbm_optfmt,
 532                 .maxlen         = sizeof(int),
 533                 .mode           = 0644,
 534                 .proc_handler   = proc_dointvec,
 535         },
 536         {
 537                 .procname       = "cipso_rbm_strictvalid",
 538                 .data           = &cipso_v4_rbm_strictvalid,
 539                 .maxlen         = sizeof(int),
 540                 .mode           = 0644,
 541                 .proc_handler   = proc_dointvec,
 542         },
 543 #endif /* CONFIG_NETLABEL */
 544         {
 545                 .procname       = "tcp_available_ulp",
 546                 .maxlen         = TCP_ULP_BUF_MAX,
 547                 .mode           = 0444,
 548                 .proc_handler   = proc_tcp_available_ulp,
 549         },
 550         {
 551                 .procname       = "icmp_msgs_per_sec",
 552                 .data           = &sysctl_icmp_msgs_per_sec,
 553                 .maxlen         = sizeof(int),
 554                 .mode           = 0644,
 555                 .proc_handler   = proc_dointvec_minmax,
 556                 .extra1         = SYSCTL_ZERO,
 557         },
 558         {
 559                 .procname       = "icmp_msgs_burst",
 560                 .data           = &sysctl_icmp_msgs_burst,
 561                 .maxlen         = sizeof(int),
 562                 .mode           = 0644,
 563                 .proc_handler   = proc_dointvec_minmax,
 564                 .extra1         = SYSCTL_ZERO,
 565         },
 566         {
 567                 .procname       = "udp_mem",
 568                 .data           = &sysctl_udp_mem,
 569                 .maxlen         = sizeof(sysctl_udp_mem),
 570                 .mode           = 0644,
 571                 .proc_handler   = proc_doulongvec_minmax,
 572         },
 573         {
 574                 .procname       = "fib_sync_mem",
 575                 .data           = &sysctl_fib_sync_mem,
 576                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 577                 .mode           = 0644,
 578                 .proc_handler   = proc_douintvec_minmax,
 579                 .extra1         = &sysctl_fib_sync_mem_min,
 580                 .extra2         = &sysctl_fib_sync_mem_max,
 581         },
 582         { }
 583 };
 584
 585 static struct ctl_table ipv4_net_table[] = {
 586         {
 587                 .procname       = "tcp_max_tw_buckets",
 588                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 589                 .maxlen         = sizeof(int),
 590                 .mode           = 0644,
 591                 .proc_handler   = proc_dointvec
 592         },
 593         {
 594                 .procname       = "icmp_echo_ignore_all",
 595                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 596                 .maxlen         = sizeof(u8),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dou8vec_minmax,
 599                 .extra1         = SYSCTL_ZERO,
 600                 .extra2         = SYSCTL_ONE
 601         },
 602         {
 603                 .procname       = "icmp_echo_enable_probe",
 604                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 605                 .maxlen         = sizeof(u8),
 606                 .mode           = 0644,
 607                 .proc_handler   = proc_dou8vec_minmax,
 608                 .extra1         = SYSCTL_ZERO,
 609                 .extra2         = SYSCTL_ONE
 610         },
 611         {
 612                 .procname       = "icmp_echo_ignore_broadcasts",
 613                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 614                 .maxlen         = sizeof(u8),
 615                 .mode           = 0644,
 616                 .proc_handler   = proc_dou8vec_minmax,
 617                 .extra1         = SYSCTL_ZERO,
 618                 .extra2         = SYSCTL_ONE
 619         },
 620         {
 621                 .procname       = "icmp_ignore_bogus_error_responses",
 622                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 623                 .maxlen         = sizeof(u8),
 624                 .mode           = 0644,
 625                 .proc_handler   = proc_dou8vec_minmax,
 626                 .extra1         = SYSCTL_ZERO,
 627                 .extra2         = SYSCTL_ONE
 628         },
 629         {
 630                 .procname       = "icmp_errors_use_inbound_ifaddr",
 631                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 632                 .maxlen         = sizeof(u8),
 633                 .mode           = 0644,
 634                 .proc_handler   = proc_dou8vec_minmax,
 635                 .extra1         = SYSCTL_ZERO,
 636                 .extra2         = SYSCTL_ONE
 637         },
 638         {
 639                 .procname       = "icmp_ratelimit",
 640                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 641                 .maxlen         = sizeof(int),
 642                 .mode           = 0644,
 643                 .proc_handler   = proc_dointvec_ms_jiffies,
 644         },
 645         {
 646                 .procname       = "icmp_ratemask",
 647                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 648                 .maxlen         = sizeof(int),
 649                 .mode           = 0644,
 650                 .proc_handler   = proc_dointvec
 651         },
 652         {
 653                 .procname       = "ping_group_range",
 654                 .data           = &init_net.ipv4.ping_group_range.range,
 655                 .maxlen         = sizeof(gid_t)*2,
 656                 .mode           = 0644,
 657                 .proc_handler   = ipv4_ping_group_range,
 658         },
 659 #ifdef CONFIG_NET_L3_MASTER_DEV
 660         {
 661                 .procname       = "raw_l3mdev_accept",
 662                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 663                 .maxlen         = sizeof(u8),
 664                 .mode           = 0644,
 665                 .proc_handler   = proc_dou8vec_minmax,
 666                 .extra1         = SYSCTL_ZERO,
 667                 .extra2         = SYSCTL_ONE,
 668         },
 669 #endif
 670         {
 671                 .procname       = "tcp_ecn",
 672                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 673                 .maxlen         = sizeof(u8),
 674                 .mode           = 0644,
 675                 .proc_handler   = proc_dou8vec_minmax,
 676                 .extra1         = SYSCTL_ZERO,
 677                 .extra2         = SYSCTL_TWO,
 678         },
 679         {
 680                 .procname       = "tcp_ecn_fallback",
 681                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 682                 .maxlen         = sizeof(u8),
 683                 .mode           = 0644,
 684                 .proc_handler   = proc_dou8vec_minmax,
 685                 .extra1         = SYSCTL_ZERO,
 686                 .extra2         = SYSCTL_ONE,
 687         },
 688         {
 689                 .procname       = "ip_dynaddr",
 690                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 691                 .maxlen         = sizeof(u8),
 692                 .mode           = 0644,
 693                 .proc_handler   = proc_dou8vec_minmax,
 694         },
 695         {
 696                 .procname       = "ip_early_demux",
 697                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 698                 .maxlen         = sizeof(u8),
 699                 .mode           = 0644,
 700                 .proc_handler   = proc_dou8vec_minmax,
 701         },
 702         {
 703                 .procname       = "udp_early_demux",
 704                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 705                 .maxlen         = sizeof(u8),
 706                 .mode           = 0644,
 707                 .proc_handler   = proc_dou8vec_minmax,
 708         },
 709         {
 710                 .procname       = "tcp_early_demux",
 711                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 712                 .maxlen         = sizeof(u8),
 713                 .mode           = 0644,
 714                 .proc_handler   = proc_dou8vec_minmax,
 715         },
 716         {
 717                 .procname       = "nexthop_compat_mode",
 718                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 719                 .maxlen         = sizeof(u8),
 720                 .mode           = 0644,
 721                 .proc_handler   = proc_dou8vec_minmax,
 722                 .extra1         = SYSCTL_ZERO,
 723                 .extra2         = SYSCTL_ONE,
 724         },
 725         {
 726                 .procname       = "ip_default_ttl",
 727                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 728                 .maxlen         = sizeof(u8),
 729                 .mode           = 0644,
 730                 .proc_handler   = proc_dou8vec_minmax,
 731                 .extra1         = &ip_ttl_min,
 732                 .extra2         = &ip_ttl_max,
 733         },
 734         {
 735                 .procname       = "ip_local_port_range",
 736                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 737                 .data           = &init_net.ipv4.ip_local_ports.range,
 738                 .mode           = 0644,
 739                 .proc_handler   = ipv4_local_port_range,
 740         },
 741         {
 742                 .procname       = "ip_local_reserved_ports",
 743                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 744                 .maxlen         = 65536,
 745                 .mode           = 0644,
 746                 .proc_handler   = proc_do_large_bitmap,
 747         },
 748         {
 749                 .procname       = "ip_no_pmtu_disc",
 750                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 751                 .maxlen         = sizeof(u8),
 752                 .mode           = 0644,
 753                 .proc_handler   = proc_dou8vec_minmax,
 754         },
 755         {
 756                 .procname       = "ip_forward_use_pmtu",
 757                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 758                 .maxlen         = sizeof(u8),
 759                 .mode           = 0644,
 760                 .proc_handler   = proc_dou8vec_minmax,
 761         },
 762         {
 763                 .procname       = "ip_forward_update_priority",
 764                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 765                 .maxlen         = sizeof(u8),
 766                 .mode           = 0644,
 767                 .proc_handler   = ipv4_fwd_update_priority,
 768                 .extra1         = SYSCTL_ZERO,
 769                 .extra2         = SYSCTL_ONE,
 770         },
 771         {
 772                 .procname       = "ip_nonlocal_bind",
 773                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 774                 .maxlen         = sizeof(u8),
 775                 .mode           = 0644,
 776                 .proc_handler   = proc_dou8vec_minmax,
 777         },
 778         {
 779                 .procname       = "ip_autobind_reuse",
 780                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 781                 .maxlen         = sizeof(u8),
 782                 .mode           = 0644,
 783                 .proc_handler   = proc_dou8vec_minmax,
 784                 .extra1         = SYSCTL_ZERO,
 785                 .extra2         = SYSCTL_ONE,
 786         },
 787         {
 788                 .procname       = "fwmark_reflect",
 789                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 790                 .maxlen         = sizeof(u8),
 791                 .mode           = 0644,
 792                 .proc_handler   = proc_dou8vec_minmax,
 793         },
 794         {
 795                 .procname       = "tcp_fwmark_accept",
 796                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 797                 .maxlen         = sizeof(u8),
 798                 .mode           = 0644,
 799                 .proc_handler   = proc_dou8vec_minmax,
 800         },
 801 #ifdef CONFIG_NET_L3_MASTER_DEV
 802         {
 803                 .procname       = "tcp_l3mdev_accept",
 804                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 805                 .maxlen         = sizeof(u8),
 806                 .mode           = 0644,
 807                 .proc_handler   = proc_dou8vec_minmax,
 808                 .extra1         = SYSCTL_ZERO,
 809                 .extra2         = SYSCTL_ONE,
 810         },
 811 #endif
 812         {
 813                 .procname       = "tcp_mtu_probing",
 814                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 815                 .maxlen         = sizeof(u8),
 816                 .mode           = 0644,
 817                 .proc_handler   = proc_dou8vec_minmax,
 818         },
 819         {
 820                 .procname       = "tcp_base_mss",
 821                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 822                 .maxlen         = sizeof(int),
 823                 .mode           = 0644,
 824                 .proc_handler   = proc_dointvec,
 825         },
 826         {
 827                 .procname       = "tcp_min_snd_mss",
 828                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 829                 .maxlen         = sizeof(int),
 830                 .mode           = 0644,
 831                 .proc_handler   = proc_dointvec_minmax,
 832                 .extra1         = &tcp_min_snd_mss_min,
 833                 .extra2         = &tcp_min_snd_mss_max,
 834         },
 835         {
 836                 .procname       = "tcp_mtu_probe_floor",
 837                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 838                 .maxlen         = sizeof(int),
 839                 .mode           = 0644,
 840                 .proc_handler   = proc_dointvec_minmax,
 841                 .extra1         = &tcp_min_snd_mss_min,
 842                 .extra2         = &tcp_min_snd_mss_max,
 843         },
 844         {
 845                 .procname       = "tcp_probe_threshold",
 846                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 847                 .maxlen         = sizeof(int),
 848                 .mode           = 0644,
 849                 .proc_handler   = proc_dointvec,
 850         },
 851         {
 852                 .procname       = "tcp_probe_interval",
 853                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 854                 .maxlen         = sizeof(u32),
 855                 .mode           = 0644,
 856                 .proc_handler   = proc_douintvec_minmax,
 857                 .extra2         = &u32_max_div_HZ,
 858         },
 859         {
 860                 .procname       = "igmp_link_local_mcast_reports",
 861                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 862                 .maxlen         = sizeof(u8),
 863                 .mode           = 0644,
 864                 .proc_handler   = proc_dou8vec_minmax,
 865         },
 866         {
 867                 .procname       = "igmp_max_memberships",
 868                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 869                 .maxlen         = sizeof(int),
 870                 .mode           = 0644,
 871                 .proc_handler   = proc_dointvec
 872         },
 873         {
 874                 .procname       = "igmp_max_msf",
 875                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 876                 .maxlen         = sizeof(int),
 877                 .mode           = 0644,
 878                 .proc_handler   = proc_dointvec
 879         },
 880 #ifdef CONFIG_IP_MULTICAST
 881         {
 882                 .procname       = "igmp_qrv",
 883                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 884                 .maxlen         = sizeof(int),
 885                 .mode           = 0644,
 886                 .proc_handler   = proc_dointvec_minmax,
 887                 .extra1         = SYSCTL_ONE
 888         },
 889 #endif
 890         {
 891                 .procname       = "tcp_congestion_control",
 892                 .data           = &init_net.ipv4.tcp_congestion_control,
 893                 .mode           = 0644,
 894                 .maxlen         = TCP_CA_NAME_MAX,
 895                 .proc_handler   = proc_tcp_congestion_control,
 896         },
 897         {
 898                 .procname       = "tcp_available_congestion_control",
 899                 .maxlen         = TCP_CA_BUF_MAX,
 900                 .mode           = 0444,
 901                 .proc_handler   = proc_tcp_available_congestion_control,
 902         },
 903         {
 904                 .procname       = "tcp_allowed_congestion_control",
 905                 .maxlen         = TCP_CA_BUF_MAX,
 906                 .mode           = 0644,
 907                 .proc_handler   = proc_allowed_congestion_control,
 908         },
 909         {
 910                 .procname       = "tcp_keepalive_time",
 911                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 912                 .maxlen         = sizeof(int),
 913                 .mode           = 0644,
 914                 .proc_handler   = proc_dointvec_jiffies,
 915         },
 916         {
 917                 .procname       = "tcp_keepalive_probes",
 918                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 919                 .maxlen         = sizeof(u8),
 920                 .mode           = 0644,
 921                 .proc_handler   = proc_dou8vec_minmax,
 922         },
 923         {
 924                 .procname       = "tcp_keepalive_intvl",
 925                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 926                 .maxlen         = sizeof(int),
 927                 .mode           = 0644,
 928                 .proc_handler   = proc_dointvec_jiffies,
 929         },
 930         {
 931                 .procname       = "tcp_syn_retries",
 932                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 933                 .maxlen         = sizeof(u8),
 934                 .mode           = 0644,
 935                 .proc_handler   = proc_dou8vec_minmax,
 936                 .extra1         = &tcp_syn_retries_min,
 937                 .extra2         = &tcp_syn_retries_max
 938         },
 939         {
 940                 .procname       = "tcp_synack_retries",
 941                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 942                 .maxlen         = sizeof(u8),
 943                 .mode           = 0644,
 944                 .proc_handler   = proc_dou8vec_minmax,
 945         },
 946 #ifdef CONFIG_SYN_COOKIES
 947         {
 948                 .procname       = "tcp_syncookies",
 949                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 950                 .maxlen         = sizeof(u8),
 951                 .mode           = 0644,
 952                 .proc_handler   = proc_dou8vec_minmax,
 953         },
 954 #endif
 955         {
 956                 .procname       = "tcp_migrate_req",
 957                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 958                 .maxlen         = sizeof(u8),
 959                 .mode           = 0644,
 960                 .proc_handler   = proc_dou8vec_minmax,
 961                 .extra1         = SYSCTL_ZERO,
 962                 .extra2         = SYSCTL_ONE
 963         },
 964         {
 965                 .procname       = "tcp_reordering",
 966                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 967                 .maxlen         = sizeof(int),
 968                 .mode           = 0644,
 969                 .proc_handler   = proc_dointvec
 970         },
 971         {
 972                 .procname       = "tcp_retries1",
 973                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 974                 .maxlen         = sizeof(u8),
 975                 .mode           = 0644,
 976                 .proc_handler   = proc_dou8vec_minmax,
 977                 .extra2         = &tcp_retr1_max
 978         },
 979         {
 980                 .procname       = "tcp_retries2",
 981                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 982                 .maxlen         = sizeof(u8),
 983                 .mode           = 0644,
 984                 .proc_handler   = proc_dou8vec_minmax,
 985         },
 986         {
 987                 .procname       = "tcp_orphan_retries",
 988                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 989                 .maxlen         = sizeof(u8),
 990                 .mode           = 0644,
 991                 .proc_handler   = proc_dou8vec_minmax,
 992         },
 993         {
 994                 .procname       = "tcp_fin_timeout",
 995                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 996                 .maxlen         = sizeof(int),
 997                 .mode           = 0644,
 998                 .proc_handler   = proc_dointvec_jiffies,
 999         },
1000         {
1001                 .procname       = "tcp_notsent_lowat",
1002                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1003                 .maxlen         = sizeof(unsigned int),
1004                 .mode           = 0644,
1005                 .proc_handler   = proc_douintvec,
1006         },
1007         {
1008                 .procname       = "tcp_tw_reuse",
1009                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
1010                 .maxlen         = sizeof(u8),
1011                 .mode           = 0644,
1012                 .proc_handler   = proc_dou8vec_minmax,
1013                 .extra1         = SYSCTL_ZERO,
1014                 .extra2         = SYSCTL_TWO,
1015         },
1016         {
1017                 .procname       = "tcp_max_syn_backlog",
1018                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1019                 .maxlen         = sizeof(int),
1020                 .mode           = 0644,
1021                 .proc_handler   = proc_dointvec
1022         },
1023         {
1024                 .procname       = "tcp_fastopen",
1025                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1026                 .maxlen         = sizeof(int),
1027                 .mode           = 0644,
1028                 .proc_handler   = proc_dointvec,
1029         },
1030         {
1031                 .procname       = "tcp_fastopen_key",
1032                 .mode           = 0600,
1033                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1034                 /* maxlen to print the list of keys in hex (*2), with dashes
1035                  * separating doublewords and a comma in between keys.
1036                  */
1037                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1038                                    2 * TCP_FASTOPEN_KEY_MAX) +
1039                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1040                 .proc_handler   = proc_tcp_fastopen_key,
1041         },
1042         {
1043                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1044                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1045                 .maxlen         = sizeof(int),
1046                 .mode           = 0644,
1047                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1048                 .extra1         = SYSCTL_ZERO,
1049         },
1050 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1051         {
1052                 .procname       = "fib_multipath_use_neigh",
1053                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1054                 .maxlen         = sizeof(u8),
1055                 .mode           = 0644,
1056                 .proc_handler   = proc_dou8vec_minmax,
1057                 .extra1         = SYSCTL_ZERO,
1058                 .extra2         = SYSCTL_ONE,
1059         },
1060         {
1061                 .procname       = "fib_multipath_hash_policy",
1062                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1063                 .maxlen         = sizeof(u8),
1064                 .mode           = 0644,
1065                 .proc_handler   = proc_fib_multipath_hash_policy,
1066                 .extra1         = SYSCTL_ZERO,
1067                 .extra2         = SYSCTL_THREE,
1068         },
1069         {
1070                 .procname       = "fib_multipath_hash_fields",
1071                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1072                 .maxlen         = sizeof(u32),
1073                 .mode           = 0644,
1074                 .proc_handler   = proc_fib_multipath_hash_fields,
1075                 .extra1         = SYSCTL_ONE,
1076                 .extra2         = &fib_multipath_hash_fields_all_mask,
1077         },
1078 #endif
1079         {
1080                 .procname       = "ip_unprivileged_port_start",
1081                 .maxlen         = sizeof(int),
1082                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1083                 .mode           = 0644,
1084                 .proc_handler   = ipv4_privileged_ports,
1085         },
1086 #ifdef CONFIG_NET_L3_MASTER_DEV
1087         {
1088                 .procname       = "udp_l3mdev_accept",
1089                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1090                 .maxlen         = sizeof(u8),
1091                 .mode           = 0644,
1092                 .proc_handler   = proc_dou8vec_minmax,
1093                 .extra1         = SYSCTL_ZERO,
1094                 .extra2         = SYSCTL_ONE,
1095         },
1096 #endif
1097         {
1098                 .procname       = "tcp_sack",
1099                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1100                 .maxlen         = sizeof(u8),
1101                 .mode           = 0644,
1102                 .proc_handler   = proc_dou8vec_minmax,
1103         },
1104         {
1105                 .procname       = "tcp_window_scaling",
1106                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1107                 .maxlen         = sizeof(u8),
1108                 .mode           = 0644,
1109                 .proc_handler   = proc_dou8vec_minmax,
1110         },
1111         {
1112                 .procname       = "tcp_timestamps",
1113                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1114                 .maxlen         = sizeof(u8),
1115                 .mode           = 0644,
1116                 .proc_handler   = proc_dou8vec_minmax,
1117         },
1118         {
1119                 .procname       = "tcp_early_retrans",
1120                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1121                 .maxlen         = sizeof(u8),
1122                 .mode           = 0644,
1123                 .proc_handler   = proc_dou8vec_minmax,
1124                 .extra1         = SYSCTL_ZERO,
1125                 .extra2         = SYSCTL_FOUR,
1126         },
1127         {
1128                 .procname       = "tcp_recovery",
1129                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1130                 .maxlen         = sizeof(u8),
1131                 .mode           = 0644,
1132                 .proc_handler   = proc_dou8vec_minmax,
1133         },
1134         {
1135                 .procname       = "tcp_thin_linear_timeouts",
1136                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1137                 .maxlen         = sizeof(u8),
1138                 .mode           = 0644,
1139                 .proc_handler   = proc_dou8vec_minmax,
1140         },
1141         {
1142                 .procname       = "tcp_slow_start_after_idle",
1143                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1144                 .maxlen         = sizeof(u8),
1145                 .mode           = 0644,
1146                 .proc_handler   = proc_dou8vec_minmax,
1147         },
1148         {
1149                 .procname       = "tcp_retrans_collapse",
1150                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1151                 .maxlen         = sizeof(u8),
1152                 .mode           = 0644,
1153                 .proc_handler   = proc_dou8vec_minmax,
1154         },
1155         {
1156                 .procname       = "tcp_stdurg",
1157                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1158                 .maxlen         = sizeof(u8),
1159                 .mode           = 0644,
1160                 .proc_handler   = proc_dou8vec_minmax,
1161         },
1162         {
1163                 .procname       = "tcp_rfc1337",
1164                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1165                 .maxlen         = sizeof(u8),
1166                 .mode           = 0644,
1167                 .proc_handler   = proc_dou8vec_minmax,
1168         },
1169         {
1170                 .procname       = "tcp_abort_on_overflow",
1171                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1172                 .maxlen         = sizeof(u8),
1173                 .mode           = 0644,
1174                 .proc_handler   = proc_dou8vec_minmax,
1175         },
1176         {
1177                 .procname       = "tcp_fack",
1178                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1179                 .maxlen         = sizeof(u8),
1180                 .mode           = 0644,
1181                 .proc_handler   = proc_dou8vec_minmax,
1182         },
1183         {
1184                 .procname       = "tcp_max_reordering",
1185                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1186                 .maxlen         = sizeof(int),
1187                 .mode           = 0644,
1188                 .proc_handler   = proc_dointvec
1189         },
1190         {
1191                 .procname       = "tcp_dsack",
1192                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1193                 .maxlen         = sizeof(u8),
1194                 .mode           = 0644,
1195                 .proc_handler   = proc_dou8vec_minmax,
1196         },
1197         {
1198                 .procname       = "tcp_app_win",
1199                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1200                 .maxlen         = sizeof(u8),
1201                 .mode           = 0644,
1202                 .proc_handler   = proc_dou8vec_minmax,
1203                 .extra1         = SYSCTL_ZERO,
1204                 .extra2         = &tcp_app_win_max,
1205         },
1206         {
1207                 .procname       = "tcp_adv_win_scale",
1208                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1209                 .maxlen         = sizeof(int),
1210                 .mode           = 0644,
1211                 .proc_handler   = proc_dointvec_minmax,
1212                 .extra1         = &tcp_adv_win_scale_min,
1213                 .extra2         = &tcp_adv_win_scale_max,
1214         },
1215         {
1216                 .procname       = "tcp_frto",
1217                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1218                 .maxlen         = sizeof(u8),
1219                 .mode           = 0644,
1220                 .proc_handler   = proc_dou8vec_minmax,
1221         },
1222         {
1223                 .procname       = "tcp_no_metrics_save",
1224                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1225                 .maxlen         = sizeof(u8),
1226                 .mode           = 0644,
1227                 .proc_handler   = proc_dou8vec_minmax,
1228         },
1229         {
1230                 .procname       = "tcp_no_ssthresh_metrics_save",
1231                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1232                 .maxlen         = sizeof(u8),
1233                 .mode           = 0644,
1234                 .proc_handler   = proc_dou8vec_minmax,
1235                 .extra1         = SYSCTL_ZERO,
1236                 .extra2         = SYSCTL_ONE,
1237         },
1238         {
1239                 .procname       = "tcp_moderate_rcvbuf",
1240                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1241                 .maxlen         = sizeof(u8),
1242                 .mode           = 0644,
1243                 .proc_handler   = proc_dou8vec_minmax,
1244         },
1245         {
1246                 .procname       = "tcp_tso_win_divisor",
1247                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1248                 .maxlen         = sizeof(u8),
1249                 .mode           = 0644,
1250                 .proc_handler   = proc_dou8vec_minmax,
1251         },
1252         {
1253                 .procname       = "tcp_workaround_signed_windows",
1254                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1255                 .maxlen         = sizeof(u8),
1256                 .mode           = 0644,
1257                 .proc_handler   = proc_dou8vec_minmax,
1258         },
1259         {
1260                 .procname       = "tcp_limit_output_bytes",
1261                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1262                 .maxlen         = sizeof(int),
1263                 .mode           = 0644,
1264                 .proc_handler   = proc_dointvec
1265         },
1266         {
1267                 .procname       = "tcp_challenge_ack_limit",
1268                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1269                 .maxlen         = sizeof(int),
1270                 .mode           = 0644,
1271                 .proc_handler   = proc_dointvec
1272         },
1273         {
1274                 .procname       = "tcp_min_tso_segs",
1275                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1276                 .maxlen         = sizeof(u8),
1277                 .mode           = 0644,
1278                 .proc_handler   = proc_dou8vec_minmax,
1279                 .extra1         = SYSCTL_ONE,
1280         },
1281         {
1282                 .procname       = "tcp_tso_rtt_log",
1283                 .data           = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1284                 .maxlen         = sizeof(u8),
1285                 .mode           = 0644,
1286                 .proc_handler   = proc_dou8vec_minmax,
1287         },
1288         {
1289                 .procname       = "tcp_min_rtt_wlen",
1290                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1291                 .maxlen         = sizeof(int),
1292                 .mode           = 0644,
1293                 .proc_handler   = proc_dointvec_minmax,
1294                 .extra1         = SYSCTL_ZERO,
1295                 .extra2         = &one_day_secs
1296         },
1297         {
1298                 .procname       = "tcp_autocorking",
1299                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1300                 .maxlen         = sizeof(u8),
1301                 .mode           = 0644,
1302                 .proc_handler   = proc_dou8vec_minmax,
1303                 .extra1         = SYSCTL_ZERO,
1304                 .extra2         = SYSCTL_ONE,
1305         },
1306         {
1307                 .procname       = "tcp_invalid_ratelimit",
1308                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1309                 .maxlen         = sizeof(int),
1310                 .mode           = 0644,
1311                 .proc_handler   = proc_dointvec_ms_jiffies,
1312         },
1313         {
1314                 .procname       = "tcp_pacing_ss_ratio",
1315                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1316                 .maxlen         = sizeof(int),
1317                 .mode           = 0644,
1318                 .proc_handler   = proc_dointvec_minmax,
1319                 .extra1         = SYSCTL_ZERO,
1320                 .extra2         = SYSCTL_ONE_THOUSAND,
1321         },
1322         {
1323                 .procname       = "tcp_pacing_ca_ratio",
1324                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1325                 .maxlen         = sizeof(int),
1326                 .mode           = 0644,
1327                 .proc_handler   = proc_dointvec_minmax,
1328                 .extra1         = SYSCTL_ZERO,
1329                 .extra2         = SYSCTL_ONE_THOUSAND,
1330         },
1331         {
1332                 .procname       = "tcp_wmem",
1333                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1334                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1335                 .mode           = 0644,
1336                 .proc_handler   = proc_dointvec_minmax,
1337                 .extra1         = SYSCTL_ONE,
1338         },
1339         {
1340                 .procname       = "tcp_rmem",
1341                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1342                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1343                 .mode           = 0644,
1344                 .proc_handler   = proc_dointvec_minmax,
1345                 .extra1         = SYSCTL_ONE,
1346         },
1347         {
1348                 .procname       = "tcp_comp_sack_delay_ns",
1349                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1350                 .maxlen         = sizeof(unsigned long),
1351                 .mode           = 0644,
1352                 .proc_handler   = proc_doulongvec_minmax,
1353         },
1354         {
1355                 .procname       = "tcp_comp_sack_slack_ns",
1356                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1357                 .maxlen         = sizeof(unsigned long),
1358                 .mode           = 0644,
1359                 .proc_handler   = proc_doulongvec_minmax,
1360         },
1361         {
1362                 .procname       = "tcp_comp_sack_nr",
1363                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1364                 .maxlen         = sizeof(u8),
1365                 .mode           = 0644,
1366                 .proc_handler   = proc_dou8vec_minmax,
1367                 .extra1         = SYSCTL_ZERO,
1368         },
1369         {
1370                 .procname       = "tcp_backlog_ack_defer",
1371                 .data           = &init_net.ipv4.sysctl_tcp_backlog_ack_defer,
1372                 .maxlen         = sizeof(u8),
1373                 .mode           = 0644,
1374                 .proc_handler   = proc_dou8vec_minmax,
1375                 .extra1         = SYSCTL_ZERO,
1376                 .extra2         = SYSCTL_ONE,
1377         },
1378         {
1379                 .procname       = "tcp_reflect_tos",
1380                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1381                 .maxlen         = sizeof(u8),
1382                 .mode           = 0644,
1383                 .proc_handler   = proc_dou8vec_minmax,
1384                 .extra1         = SYSCTL_ZERO,
1385                 .extra2         = SYSCTL_ONE,
1386         },
1387         {
1388                 .procname       = "tcp_ehash_entries",
1389                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1390                 .mode           = 0444,
1391                 .proc_handler   = proc_tcp_ehash_entries,
1392         },
1393         {
1394                 .procname       = "tcp_child_ehash_entries",
1395                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1396                 .maxlen         = sizeof(unsigned int),
1397                 .mode           = 0644,
1398                 .proc_handler   = proc_douintvec_minmax,
1399                 .extra1         = SYSCTL_ZERO,
1400                 .extra2         = &tcp_child_ehash_entries_max,
1401         },
1402         {
1403                 .procname       = "udp_hash_entries",
1404                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1405                 .mode           = 0444,
1406                 .proc_handler   = proc_udp_hash_entries,
1407         },
1408         {
1409                 .procname       = "udp_child_hash_entries",
1410                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1411                 .maxlen         = sizeof(unsigned int),
1412                 .mode           = 0644,
1413                 .proc_handler   = proc_douintvec_minmax,
1414                 .extra1         = SYSCTL_ZERO,
1415                 .extra2         = &udp_child_hash_entries_max,
1416         },
1417         {
1418                 .procname       = "udp_rmem_min",
1419                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1420                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1421                 .mode           = 0644,
1422                 .proc_handler   = proc_dointvec_minmax,
1423                 .extra1         = SYSCTL_ONE
1424         },
1425         {
1426                 .procname       = "udp_wmem_min",
1427                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1428                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1429                 .mode           = 0644,
1430                 .proc_handler   = proc_dointvec_minmax,
1431                 .extra1         = SYSCTL_ONE
1432         },
1433         {
1434                 .procname       = "fib_notify_on_flag_change",
1435                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1436                 .maxlen         = sizeof(u8),
1437                 .mode           = 0644,
1438                 .proc_handler   = proc_dou8vec_minmax,
1439                 .extra1         = SYSCTL_ZERO,
1440                 .extra2         = SYSCTL_TWO,
1441         },
1442         {
1443                 .procname       = "tcp_plb_enabled",
1444                 .data           = &init_net.ipv4.sysctl_tcp_plb_enabled,
1445                 .maxlen         = sizeof(u8),
1446                 .mode           = 0644,
1447                 .proc_handler   = proc_dou8vec_minmax,
1448                 .extra1         = SYSCTL_ZERO,
1449                 .extra2         = SYSCTL_ONE,
1450         },
1451         {
1452                 .procname       = "tcp_plb_idle_rehash_rounds",
1453                 .data           = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds,
1454                 .maxlen         = sizeof(u8),
1455                 .mode           = 0644,
1456                 .proc_handler   = proc_dou8vec_minmax,
1457                 .extra2         = &tcp_plb_max_rounds,
1458         },
1459         {
1460                 .procname       = "tcp_plb_rehash_rounds",
1461                 .data           = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds,
1462                 .maxlen         = sizeof(u8),
1463                 .mode           = 0644,
1464                 .proc_handler   = proc_dou8vec_minmax,
1465                 .extra2         = &tcp_plb_max_rounds,
1466         },
1467         {
1468                 .procname       = "tcp_plb_suspend_rto_sec",
1469                 .data           = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec,
1470                 .maxlen         = sizeof(u8),
1471                 .mode           = 0644,
1472                 .proc_handler   = proc_dou8vec_minmax,
1473         },
1474         {
1475                 .procname       = "tcp_plb_cong_thresh",
1476                 .data           = &init_net.ipv4.sysctl_tcp_plb_cong_thresh,
1477                 .maxlen         = sizeof(int),
1478                 .mode           = 0644,
1479                 .proc_handler   = proc_dointvec_minmax,
1480                 .extra1         = SYSCTL_ZERO,
1481                 .extra2         = &tcp_plb_max_cong_thresh,
1482         },
1483         {
1484                 .procname       = "tcp_syn_linear_timeouts",
1485                 .data           = &init_net.ipv4.sysctl_tcp_syn_linear_timeouts,
1486                 .maxlen         = sizeof(u8),
1487                 .mode           = 0644,
1488                 .proc_handler   = proc_dou8vec_minmax,
1489                 .extra1         = SYSCTL_ZERO,
1490                 .extra2         = &tcp_syn_linear_timeouts_max,
1491         },
1492         {
1493                 .procname       = "tcp_shrink_window",
1494                 .data           = &init_net.ipv4.sysctl_tcp_shrink_window,
1495                 .maxlen         = sizeof(u8),
1496                 .mode           = 0644,
1497                 .proc_handler   = proc_dou8vec_minmax,
1498                 .extra1         = SYSCTL_ZERO,
1499                 .extra2         = SYSCTL_ONE,
1500         },
1501         {
1502                 .procname       = "tcp_pingpong_thresh",
1503                 .data           = &init_net.ipv4.sysctl_tcp_pingpong_thresh,
1504                 .maxlen         = sizeof(u8),
1505                 .mode           = 0644,
1506                 .proc_handler   = proc_dou8vec_minmax,
1507                 .extra1         = SYSCTL_ONE,
1508         },
1509         { }
1510 };
1511
1512 static __net_init int ipv4_sysctl_init_net(struct net *net)
1513 {
1514         struct ctl_table *table;
1515
1516         table = ipv4_net_table;
1517         if (!net_eq(net, &init_net)) {
1518                 int i;
1519
1520                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1521                 if (!table)
1522                         goto err_alloc;
1523
1524                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1525                         if (table[i].data) {
1526                                 /* Update the variables to point into
1527                                  * the current struct net
1528                                  */
1529                                 table[i].data += (void *)net - (void *)&init_net;
1530                         } else {
1531                                 /* Entries without data pointer are global;
1532                                  * Make them read-only in non-init_net ns
1533                                  */
1534                                 table[i].mode &= ~0222;
1535                         }
1536                 }
1537         }
1538
1539         net->ipv4.ipv4_hdr = register_net_sysctl_sz(net, "net/ipv4", table,
1540                                                     ARRAY_SIZE(ipv4_net_table));
1541         if (!net->ipv4.ipv4_hdr)
1542                 goto err_reg;
1543
1544         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1545         if (!net->ipv4.sysctl_local_reserved_ports)
1546                 goto err_ports;
1547
1548         return 0;
1549
1550 err_ports:
1551         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1552 err_reg:
1553         if (!net_eq(net, &init_net))
1554                 kfree(table);
1555 err_alloc:
1556         return -ENOMEM;
1557 }
1558
1559 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1560 {
1561         struct ctl_table *table;
1562
1563         kfree(net->ipv4.sysctl_local_reserved_ports);
1564         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1565         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1566         kfree(table);
1567 }
1568
1569 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1570         .init = ipv4_sysctl_init_net,
1571         .exit = ipv4_sysctl_exit_net,
1572 };
1573
1574 static __init int sysctl_ipv4_init(void)
1575 {
1576         struct ctl_table_header *hdr;
1577
1578         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1579         if (!hdr)
1580                 return -ENOMEM;
1581
1582         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1583                 unregister_net_sysctl_table(hdr);
1584                 return -ENOMEM;
1585         }
1586
1587         return 0;
1588 }
1589
1590 __initcall(sysctl_ipv4_init);