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