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 zero;
  32 static int one = 1;
  33 static int two = 2;
  34 static int four = 4;
  35 static int thousand = 1000;
  36 static int gso_max_segs = GSO_MAX_SEGS;
  37 static int tcp_retr1_max = 255;
  38 static int ip_local_port_range_min[] = { 1, 1 };
  39 static int ip_local_port_range_max[] = { 65535, 65535 };
  40 static int tcp_adv_win_scale_min = -31;
  41 static int tcp_adv_win_scale_max = 31;
  42 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  43 static int tcp_min_snd_mss_max = 65535;
  44 static int ip_privileged_port_min;
  45 static int ip_privileged_port_max = 65535;
  46 static int ip_ttl_min = 1;
  47 static int ip_ttl_max = 255;
  48 static int tcp_syn_retries_min = 1;
  49 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  50 static int ip_ping_group_range_min[] = { 0, 0 };
  51 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  52 static int comp_sack_nr_max = 255;
  53 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  54 static int one_day_secs = 24 * 3600;
  55
  56 /* obsolete */
  57 static int sysctl_tcp_low_latency __read_mostly;
  58
  59 /* Update system visible IP port range */
  60 static void set_local_port_range(struct net *net, int range[2])
  61 {
  62         bool same_parity = !((range[0] ^ range[1]) & 1);
  63
  64         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  65         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  66                 net->ipv4.ip_local_ports.warned = true;
  67                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  68         }
  69         net->ipv4.ip_local_ports.range[0] = range[0];
  70         net->ipv4.ip_local_ports.range[1] = range[1];
  71         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  72 }
  73
  74 /* Validate changes from /proc interface. */
  75 static int ipv4_local_port_range(struct ctl_table *table, int write,
  76                                  void __user *buffer,
  77                                  size_t *lenp, loff_t *ppos)
  78 {
  79         struct net *net =
  80                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  81         int ret;
  82         int range[2];
  83         struct ctl_table tmp = {
  84                 .data = &range,
  85                 .maxlen = sizeof(range),
  86                 .mode = table->mode,
  87                 .extra1 = &ip_local_port_range_min,
  88                 .extra2 = &ip_local_port_range_max,
  89         };
  90
  91         inet_get_local_port_range(net, &range[0], &range[1]);
  92
  93         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  94
  95         if (write && ret == 0) {
  96                 /* Ensure that the upper limit is not smaller than the lower,
  97                  * and that the lower does not encroach upon the privileged
  98                  * port limit.
  99                  */
 100                 if ((range[1] < range[0]) ||
 101                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
 102                         ret = -EINVAL;
 103                 else
 104                         set_local_port_range(net, range);
 105         }
 106
 107         return ret;
 108 }
 109
 110 /* Validate changes from /proc interface. */
 111 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 112                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 113 {
 114         struct net *net = container_of(table->data, struct net,
 115             ipv4.sysctl_ip_prot_sock);
 116         int ret;
 117         int pports;
 118         int range[2];
 119         struct ctl_table tmp = {
 120                 .data = &pports,
 121                 .maxlen = sizeof(pports),
 122                 .mode = table->mode,
 123                 .extra1 = &ip_privileged_port_min,
 124                 .extra2 = &ip_privileged_port_max,
 125         };
 126
 127         pports = net->ipv4.sysctl_ip_prot_sock;
 128
 129         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 130
 131         if (write && ret == 0) {
 132                 inet_get_local_port_range(net, &range[0], &range[1]);
 133                 /* Ensure that the local port range doesn't overlap with the
 134                  * privileged port range.
 135                  */
 136                 if (range[0] < pports)
 137                         ret = -EINVAL;
 138                 else
 139                         net->ipv4.sysctl_ip_prot_sock = pports;
 140         }
 141
 142         return ret;
 143 }
 144
 145 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 146 {
 147         kgid_t *data = table->data;
 148         struct net *net =
 149                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 150         unsigned int seq;
 151         do {
 152                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 153
 154                 *low = data[0];
 155                 *high = data[1];
 156         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 157 }
 158
 159 /* Update system visible IP port range */
 160 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 161 {
 162         kgid_t *data = table->data;
 163         struct net *net =
 164                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 165         write_seqlock(&net->ipv4.ping_group_range.lock);
 166         data[0] = low;
 167         data[1] = high;
 168         write_sequnlock(&net->ipv4.ping_group_range.lock);
 169 }
 170
 171 /* Validate changes from /proc interface. */
 172 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 173                                  void __user *buffer,
 174                                  size_t *lenp, loff_t *ppos)
 175 {
 176         struct user_namespace *user_ns = current_user_ns();
 177         int ret;
 178         gid_t urange[2];
 179         kgid_t low, high;
 180         struct ctl_table tmp = {
 181                 .data = &urange,
 182                 .maxlen = sizeof(urange),
 183                 .mode = table->mode,
 184                 .extra1 = &ip_ping_group_range_min,
 185                 .extra2 = &ip_ping_group_range_max,
 186         };
 187
 188         inet_get_ping_group_range_table(table, &low, &high);
 189         urange[0] = from_kgid_munged(user_ns, low);
 190         urange[1] = from_kgid_munged(user_ns, high);
 191         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 192
 193         if (write && ret == 0) {
 194                 low = make_kgid(user_ns, urange[0]);
 195                 high = make_kgid(user_ns, urange[1]);
 196                 if (!gid_valid(low) || !gid_valid(high))
 197                         return -EINVAL;
 198                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 199                         low = make_kgid(&init_user_ns, 1);
 200                         high = make_kgid(&init_user_ns, 0);
 201                 }
 202                 set_ping_group_range(table, low, high);
 203         }
 204
 205         return ret;
 206 }
 207
 208 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 209                                     void __user *buffer,
 210                                     size_t *lenp, loff_t *ppos)
 211 {
 212         struct net *net;
 213         int ret;
 214
 215         net = container_of(table->data, struct net,
 216                            ipv4.sysctl_ip_fwd_update_priority);
 217         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 218         if (write && ret == 0)
 219                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 220                                         net);
 221
 222         return ret;
 223 }
 224
 225 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 226                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 227 {
 228         struct net *net = container_of(ctl->data, struct net,
 229                                        ipv4.tcp_congestion_control);
 230         char val[TCP_CA_NAME_MAX];
 231         struct ctl_table tbl = {
 232                 .data = val,
 233                 .maxlen = TCP_CA_NAME_MAX,
 234         };
 235         int ret;
 236
 237         tcp_get_default_congestion_control(net, val);
 238
 239         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 240         if (write && ret == 0)
 241                 ret = tcp_set_default_congestion_control(net, val);
 242         return ret;
 243 }
 244
 245 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 246                                                  int write,
 247                                                  void __user *buffer, size_t *lenp,
 248                                                  loff_t *ppos)
 249 {
 250         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 251         int ret;
 252
 253         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 254         if (!tbl.data)
 255                 return -ENOMEM;
 256         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 257         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 258         kfree(tbl.data);
 259         return ret;
 260 }
 261
 262 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 263                                            int write,
 264                                            void __user *buffer, size_t *lenp,
 265                                            loff_t *ppos)
 266 {
 267         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 268         int ret;
 269
 270         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 271         if (!tbl.data)
 272                 return -ENOMEM;
 273
 274         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 275         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 276         if (write && ret == 0)
 277                 ret = tcp_set_allowed_congestion_control(tbl.data);
 278         kfree(tbl.data);
 279         return ret;
 280 }
 281
 282 static int sscanf_key(char *buf, __le32 *key)
 283 {
 284         u32 user_key[4];
 285         int i, ret = 0;
 286
 287         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 288                    user_key + 2, user_key + 3) != 4) {
 289                 ret = -EINVAL;
 290         } else {
 291                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 292                         key[i] = cpu_to_le32(user_key[i]);
 293         }
 294         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 295                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 296
 297         return ret;
 298 }
 299
 300 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 301                                  void __user *buffer, size_t *lenp,
 302                                  loff_t *ppos)
 303 {
 304         struct net *net = container_of(table->data, struct net,
 305             ipv4.sysctl_tcp_fastopen);
 306         /* maxlen to print the list of keys in hex (*2), with dashes
 307          * separating doublewords and a comma in between keys.
 308          */
 309         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 310                                             2 * TCP_FASTOPEN_KEY_MAX) +
 311                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 312         struct tcp_fastopen_context *ctx;
 313         u32 user_key[TCP_FASTOPEN_KEY_MAX * 4];
 314         __le32 key[TCP_FASTOPEN_KEY_MAX * 4];
 315         char *backup_data;
 316         int ret, i = 0, off = 0, n_keys = 0;
 317
 318         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 319         if (!tbl.data)
 320                 return -ENOMEM;
 321
 322         rcu_read_lock();
 323         ctx = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 324         if (ctx) {
 325                 n_keys = tcp_fastopen_context_len(ctx);
 326                 memcpy(&key[0], &ctx->key[0], TCP_FASTOPEN_KEY_LENGTH * n_keys);
 327         }
 328         rcu_read_unlock();
 329
 330         if (!n_keys) {
 331                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 332                 n_keys = 1;
 333         }
 334
 335         for (i = 0; i < n_keys * 4; i++)
 336                 user_key[i] = le32_to_cpu(key[i]);
 337
 338         for (i = 0; i < n_keys; i++) {
 339                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 340                                 "%08x-%08x-%08x-%08x",
 341                                 user_key[i * 4],
 342                                 user_key[i * 4 + 1],
 343                                 user_key[i * 4 + 2],
 344                                 user_key[i * 4 + 3]);
 345                 if (i + 1 < n_keys)
 346                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 347         }
 348
 349         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 350
 351         if (write && ret == 0) {
 352                 backup_data = strchr(tbl.data, ',');
 353                 if (backup_data) {
 354                         *backup_data = '\0';
 355                         backup_data++;
 356                 }
 357                 if (sscanf_key(tbl.data, key)) {
 358                         ret = -EINVAL;
 359                         goto bad_key;
 360                 }
 361                 if (backup_data) {
 362                         if (sscanf_key(backup_data, key + 4)) {
 363                                 ret = -EINVAL;
 364                                 goto bad_key;
 365                         }
 366                 }
 367                 tcp_fastopen_reset_cipher(net, NULL, key,
 368                                           backup_data ? key + 4 : NULL);
 369         }
 370
 371 bad_key:
 372         kfree(tbl.data);
 373         return ret;
 374 }
 375
 376 static void proc_configure_early_demux(int enabled, int protocol)
 377 {
 378         struct net_protocol *ipprot;
 379 #if IS_ENABLED(CONFIG_IPV6)
 380         struct inet6_protocol *ip6prot;
 381 #endif
 382
 383         rcu_read_lock();
 384
 385         ipprot = rcu_dereference(inet_protos[protocol]);
 386         if (ipprot)
 387                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 388                                                 NULL;
 389
 390 #if IS_ENABLED(CONFIG_IPV6)
 391         ip6prot = rcu_dereference(inet6_protos[protocol]);
 392         if (ip6prot)
 393                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 394                                                  NULL;
 395 #endif
 396         rcu_read_unlock();
 397 }
 398
 399 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 400                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 401 {
 402         int ret = 0;
 403
 404         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 405
 406         if (write && !ret) {
 407                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 408
 409                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 410         }
 411
 412         return ret;
 413 }
 414
 415 static int proc_udp_early_demux(struct ctl_table *table, int write,
 416                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 417 {
 418         int ret = 0;
 419
 420         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 421
 422         if (write && !ret) {
 423                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 424
 425                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 426         }
 427
 428         return ret;
 429 }
 430
 431 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 432                                              int write,
 433                                              void __user *buffer,
 434                                              size_t *lenp, loff_t *ppos)
 435 {
 436         struct net *net = container_of(table->data, struct net,
 437             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 438         int ret;
 439
 440         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 441         if (write && ret == 0)
 442                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 443
 444         return ret;
 445 }
 446
 447 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 448                                   int write,
 449                                   void __user *buffer, size_t *lenp,
 450                                   loff_t *ppos)
 451 {
 452         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 453         int ret;
 454
 455         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 456         if (!tbl.data)
 457                 return -ENOMEM;
 458         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 459         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 460         kfree(tbl.data);
 461
 462         return ret;
 463 }
 464
 465 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 466 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 467                                           void __user *buffer, size_t *lenp,
 468                                           loff_t *ppos)
 469 {
 470         struct net *net = container_of(table->data, struct net,
 471             ipv4.sysctl_fib_multipath_hash_policy);
 472         int ret;
 473
 474         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 475         if (write && ret == 0)
 476                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 477
 478         return ret;
 479 }
 480 #endif
 481
 482 static struct ctl_table ipv4_table[] = {
 483         {
 484                 .procname       = "tcp_max_orphans",
 485                 .data           = &sysctl_tcp_max_orphans,
 486                 .maxlen         = sizeof(int),
 487                 .mode           = 0644,
 488                 .proc_handler   = proc_dointvec
 489         },
 490         {
 491                 .procname       = "inet_peer_threshold",
 492                 .data           = &inet_peer_threshold,
 493                 .maxlen         = sizeof(int),
 494                 .mode           = 0644,
 495                 .proc_handler   = proc_dointvec
 496         },
 497         {
 498                 .procname       = "inet_peer_minttl",
 499                 .data           = &inet_peer_minttl,
 500                 .maxlen         = sizeof(int),
 501                 .mode           = 0644,
 502                 .proc_handler   = proc_dointvec_jiffies,
 503         },
 504         {
 505                 .procname       = "inet_peer_maxttl",
 506                 .data           = &inet_peer_maxttl,
 507                 .maxlen         = sizeof(int),
 508                 .mode           = 0644,
 509                 .proc_handler   = proc_dointvec_jiffies,
 510         },
 511         {
 512                 .procname       = "tcp_mem",
 513                 .maxlen         = sizeof(sysctl_tcp_mem),
 514                 .data           = &sysctl_tcp_mem,
 515                 .mode           = 0644,
 516                 .proc_handler   = proc_doulongvec_minmax,
 517         },
 518         {
 519                 .procname       = "tcp_low_latency",
 520                 .data           = &sysctl_tcp_low_latency,
 521                 .maxlen         = sizeof(int),
 522                 .mode           = 0644,
 523                 .proc_handler   = proc_dointvec
 524         },
 525 #ifdef CONFIG_NETLABEL
 526         {
 527                 .procname       = "cipso_cache_enable",
 528                 .data           = &cipso_v4_cache_enabled,
 529                 .maxlen         = sizeof(int),
 530                 .mode           = 0644,
 531                 .proc_handler   = proc_dointvec,
 532         },
 533         {
 534                 .procname       = "cipso_cache_bucket_size",
 535                 .data           = &cipso_v4_cache_bucketsize,
 536                 .maxlen         = sizeof(int),
 537                 .mode           = 0644,
 538                 .proc_handler   = proc_dointvec,
 539         },
 540         {
 541                 .procname       = "cipso_rbm_optfmt",
 542                 .data           = &cipso_v4_rbm_optfmt,
 543                 .maxlen         = sizeof(int),
 544                 .mode           = 0644,
 545                 .proc_handler   = proc_dointvec,
 546         },
 547         {
 548                 .procname       = "cipso_rbm_strictvalid",
 549                 .data           = &cipso_v4_rbm_strictvalid,
 550                 .maxlen         = sizeof(int),
 551                 .mode           = 0644,
 552                 .proc_handler   = proc_dointvec,
 553         },
 554 #endif /* CONFIG_NETLABEL */
 555         {
 556                 .procname       = "tcp_available_congestion_control",
 557                 .maxlen         = TCP_CA_BUF_MAX,
 558                 .mode           = 0444,
 559                 .proc_handler   = proc_tcp_available_congestion_control,
 560         },
 561         {
 562                 .procname       = "tcp_allowed_congestion_control",
 563                 .maxlen         = TCP_CA_BUF_MAX,
 564                 .mode           = 0644,
 565                 .proc_handler   = proc_allowed_congestion_control,
 566         },
 567         {
 568                 .procname       = "tcp_available_ulp",
 569                 .maxlen         = TCP_ULP_BUF_MAX,
 570                 .mode           = 0444,
 571                 .proc_handler   = proc_tcp_available_ulp,
 572         },
 573         {
 574                 .procname       = "icmp_msgs_per_sec",
 575                 .data           = &sysctl_icmp_msgs_per_sec,
 576                 .maxlen         = sizeof(int),
 577                 .mode           = 0644,
 578                 .proc_handler   = proc_dointvec_minmax,
 579                 .extra1         = &zero,
 580         },
 581         {
 582                 .procname       = "icmp_msgs_burst",
 583                 .data           = &sysctl_icmp_msgs_burst,
 584                 .maxlen         = sizeof(int),
 585                 .mode           = 0644,
 586                 .proc_handler   = proc_dointvec_minmax,
 587                 .extra1         = &zero,
 588         },
 589         {
 590                 .procname       = "udp_mem",
 591                 .data           = &sysctl_udp_mem,
 592                 .maxlen         = sizeof(sysctl_udp_mem),
 593                 .mode           = 0644,
 594                 .proc_handler   = proc_doulongvec_minmax,
 595         },
 596         {
 597                 .procname       = "fib_sync_mem",
 598                 .data           = &sysctl_fib_sync_mem,
 599                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 600                 .mode           = 0644,
 601                 .proc_handler   = proc_douintvec_minmax,
 602                 .extra1         = &sysctl_fib_sync_mem_min,
 603                 .extra2         = &sysctl_fib_sync_mem_max,
 604         },
 605         {
 606                 .procname       = "tcp_rx_skb_cache",
 607                 .data           = &tcp_rx_skb_cache_key.key,
 608                 .mode           = 0644,
 609                 .proc_handler   = proc_do_static_key,
 610         },
 611         {
 612                 .procname       = "tcp_tx_skb_cache",
 613                 .data           = &tcp_tx_skb_cache_key.key,
 614                 .mode           = 0644,
 615                 .proc_handler   = proc_do_static_key,
 616         },
 617         { }
 618 };
 619
 620 static struct ctl_table ipv4_net_table[] = {
 621         {
 622                 .procname       = "icmp_echo_ignore_all",
 623                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 624                 .maxlen         = sizeof(int),
 625                 .mode           = 0644,
 626                 .proc_handler   = proc_dointvec
 627         },
 628         {
 629                 .procname       = "icmp_echo_ignore_broadcasts",
 630                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = proc_dointvec
 634         },
 635         {
 636                 .procname       = "icmp_ignore_bogus_error_responses",
 637                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 638                 .maxlen         = sizeof(int),
 639                 .mode           = 0644,
 640                 .proc_handler   = proc_dointvec
 641         },
 642         {
 643                 .procname       = "icmp_errors_use_inbound_ifaddr",
 644                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 645                 .maxlen         = sizeof(int),
 646                 .mode           = 0644,
 647                 .proc_handler   = proc_dointvec
 648         },
 649         {
 650                 .procname       = "icmp_ratelimit",
 651                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 652                 .maxlen         = sizeof(int),
 653                 .mode           = 0644,
 654                 .proc_handler   = proc_dointvec_ms_jiffies,
 655         },
 656         {
 657                 .procname       = "icmp_ratemask",
 658                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 659                 .maxlen         = sizeof(int),
 660                 .mode           = 0644,
 661                 .proc_handler   = proc_dointvec
 662         },
 663         {
 664                 .procname       = "ping_group_range",
 665                 .data           = &init_net.ipv4.ping_group_range.range,
 666                 .maxlen         = sizeof(gid_t)*2,
 667                 .mode           = 0644,
 668                 .proc_handler   = ipv4_ping_group_range,
 669         },
 670 #ifdef CONFIG_NET_L3_MASTER_DEV
 671         {
 672                 .procname       = "raw_l3mdev_accept",
 673                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 674                 .maxlen         = sizeof(int),
 675                 .mode           = 0644,
 676                 .proc_handler   = proc_dointvec_minmax,
 677                 .extra1         = &zero,
 678                 .extra2         = &one,
 679         },
 680 #endif
 681         {
 682                 .procname       = "tcp_ecn",
 683                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 684                 .maxlen         = sizeof(int),
 685                 .mode           = 0644,
 686                 .proc_handler   = proc_dointvec
 687         },
 688         {
 689                 .procname       = "tcp_ecn_fallback",
 690                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 691                 .maxlen         = sizeof(int),
 692                 .mode           = 0644,
 693                 .proc_handler   = proc_dointvec
 694         },
 695         {
 696                 .procname       = "ip_dynaddr",
 697                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 698                 .maxlen         = sizeof(int),
 699                 .mode           = 0644,
 700                 .proc_handler   = proc_dointvec
 701         },
 702         {
 703                 .procname       = "ip_early_demux",
 704                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 705                 .maxlen         = sizeof(int),
 706                 .mode           = 0644,
 707                 .proc_handler   = proc_dointvec
 708         },
 709         {
 710                 .procname       = "udp_early_demux",
 711                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 712                 .maxlen         = sizeof(int),
 713                 .mode           = 0644,
 714                 .proc_handler   = proc_udp_early_demux
 715         },
 716         {
 717                 .procname       = "tcp_early_demux",
 718                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 719                 .maxlen         = sizeof(int),
 720                 .mode           = 0644,
 721                 .proc_handler   = proc_tcp_early_demux
 722         },
 723         {
 724                 .procname       = "ip_default_ttl",
 725                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 726                 .maxlen         = sizeof(int),
 727                 .mode           = 0644,
 728                 .proc_handler   = proc_dointvec_minmax,
 729                 .extra1         = &ip_ttl_min,
 730                 .extra2         = &ip_ttl_max,
 731         },
 732         {
 733                 .procname       = "ip_local_port_range",
 734                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 735                 .data           = &init_net.ipv4.ip_local_ports.range,
 736                 .mode           = 0644,
 737                 .proc_handler   = ipv4_local_port_range,
 738         },
 739         {
 740                 .procname       = "ip_local_reserved_ports",
 741                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 742                 .maxlen         = 65536,
 743                 .mode           = 0644,
 744                 .proc_handler   = proc_do_large_bitmap,
 745         },
 746         {
 747                 .procname       = "ip_no_pmtu_disc",
 748                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 749                 .maxlen         = sizeof(int),
 750                 .mode           = 0644,
 751                 .proc_handler   = proc_dointvec
 752         },
 753         {
 754                 .procname       = "ip_forward_use_pmtu",
 755                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 756                 .maxlen         = sizeof(int),
 757                 .mode           = 0644,
 758                 .proc_handler   = proc_dointvec,
 759         },
 760         {
 761                 .procname       = "ip_forward_update_priority",
 762                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 763                 .maxlen         = sizeof(int),
 764                 .mode           = 0644,
 765                 .proc_handler   = ipv4_fwd_update_priority,
 766                 .extra1         = &zero,
 767                 .extra2         = &one,
 768         },
 769         {
 770                 .procname       = "ip_nonlocal_bind",
 771                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 772                 .maxlen         = sizeof(int),
 773                 .mode           = 0644,
 774                 .proc_handler   = proc_dointvec
 775         },
 776         {
 777                 .procname       = "fwmark_reflect",
 778                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 779                 .maxlen         = sizeof(int),
 780                 .mode           = 0644,
 781                 .proc_handler   = proc_dointvec,
 782         },
 783         {
 784                 .procname       = "tcp_fwmark_accept",
 785                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 786                 .maxlen         = sizeof(int),
 787                 .mode           = 0644,
 788                 .proc_handler   = proc_dointvec,
 789         },
 790 #ifdef CONFIG_NET_L3_MASTER_DEV
 791         {
 792                 .procname       = "tcp_l3mdev_accept",
 793                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 794                 .maxlen         = sizeof(int),
 795                 .mode           = 0644,
 796                 .proc_handler   = proc_dointvec_minmax,
 797                 .extra1         = &zero,
 798                 .extra2         = &one,
 799         },
 800 #endif
 801         {
 802                 .procname       = "tcp_mtu_probing",
 803                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 804                 .maxlen         = sizeof(int),
 805                 .mode           = 0644,
 806                 .proc_handler   = proc_dointvec,
 807         },
 808         {
 809                 .procname       = "tcp_base_mss",
 810                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 811                 .maxlen         = sizeof(int),
 812                 .mode           = 0644,
 813                 .proc_handler   = proc_dointvec,
 814         },
 815         {
 816                 .procname       = "tcp_min_snd_mss",
 817                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 818                 .maxlen         = sizeof(int),
 819                 .mode           = 0644,
 820                 .proc_handler   = proc_dointvec_minmax,
 821                 .extra1         = &tcp_min_snd_mss_min,
 822                 .extra2         = &tcp_min_snd_mss_max,
 823         },
 824         {
 825                 .procname       = "tcp_probe_threshold",
 826                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = proc_dointvec,
 830         },
 831         {
 832                 .procname       = "tcp_probe_interval",
 833                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 834                 .maxlen         = sizeof(u32),
 835                 .mode           = 0644,
 836                 .proc_handler   = proc_douintvec_minmax,
 837                 .extra2         = &u32_max_div_HZ,
 838         },
 839         {
 840                 .procname       = "igmp_link_local_mcast_reports",
 841                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 842                 .maxlen         = sizeof(int),
 843                 .mode           = 0644,
 844                 .proc_handler   = proc_dointvec
 845         },
 846         {
 847                 .procname       = "igmp_max_memberships",
 848                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 849                 .maxlen         = sizeof(int),
 850                 .mode           = 0644,
 851                 .proc_handler   = proc_dointvec
 852         },
 853         {
 854                 .procname       = "igmp_max_msf",
 855                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 856                 .maxlen         = sizeof(int),
 857                 .mode           = 0644,
 858                 .proc_handler   = proc_dointvec
 859         },
 860 #ifdef CONFIG_IP_MULTICAST
 861         {
 862                 .procname       = "igmp_qrv",
 863                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 864                 .maxlen         = sizeof(int),
 865                 .mode           = 0644,
 866                 .proc_handler   = proc_dointvec_minmax,
 867                 .extra1         = &one
 868         },
 869 #endif
 870         {
 871                 .procname       = "tcp_congestion_control",
 872                 .data           = &init_net.ipv4.tcp_congestion_control,
 873                 .mode           = 0644,
 874                 .maxlen         = TCP_CA_NAME_MAX,
 875                 .proc_handler   = proc_tcp_congestion_control,
 876         },
 877         {
 878                 .procname       = "tcp_keepalive_time",
 879                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 880                 .maxlen         = sizeof(int),
 881                 .mode           = 0644,
 882                 .proc_handler   = proc_dointvec_jiffies,
 883         },
 884         {
 885                 .procname       = "tcp_keepalive_probes",
 886                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 887                 .maxlen         = sizeof(int),
 888                 .mode           = 0644,
 889                 .proc_handler   = proc_dointvec
 890         },
 891         {
 892                 .procname       = "tcp_keepalive_intvl",
 893                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 894                 .maxlen         = sizeof(int),
 895                 .mode           = 0644,
 896                 .proc_handler   = proc_dointvec_jiffies,
 897         },
 898         {
 899                 .procname       = "tcp_syn_retries",
 900                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 901                 .maxlen         = sizeof(int),
 902                 .mode           = 0644,
 903                 .proc_handler   = proc_dointvec_minmax,
 904                 .extra1         = &tcp_syn_retries_min,
 905                 .extra2         = &tcp_syn_retries_max
 906         },
 907         {
 908                 .procname       = "tcp_synack_retries",
 909                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 910                 .maxlen         = sizeof(int),
 911                 .mode           = 0644,
 912                 .proc_handler   = proc_dointvec
 913         },
 914 #ifdef CONFIG_SYN_COOKIES
 915         {
 916                 .procname       = "tcp_syncookies",
 917                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 918                 .maxlen         = sizeof(int),
 919                 .mode           = 0644,
 920                 .proc_handler   = proc_dointvec
 921         },
 922 #endif
 923         {
 924                 .procname       = "tcp_reordering",
 925                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 926                 .maxlen         = sizeof(int),
 927                 .mode           = 0644,
 928                 .proc_handler   = proc_dointvec
 929         },
 930         {
 931                 .procname       = "tcp_retries1",
 932                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 933                 .maxlen         = sizeof(int),
 934                 .mode           = 0644,
 935                 .proc_handler   = proc_dointvec_minmax,
 936                 .extra2         = &tcp_retr1_max
 937         },
 938         {
 939                 .procname       = "tcp_retries2",
 940                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 941                 .maxlen         = sizeof(int),
 942                 .mode           = 0644,
 943                 .proc_handler   = proc_dointvec
 944         },
 945         {
 946                 .procname       = "tcp_orphan_retries",
 947                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 948                 .maxlen         = sizeof(int),
 949                 .mode           = 0644,
 950                 .proc_handler   = proc_dointvec
 951         },
 952         {
 953                 .procname       = "tcp_fin_timeout",
 954                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 955                 .maxlen         = sizeof(int),
 956                 .mode           = 0644,
 957                 .proc_handler   = proc_dointvec_jiffies,
 958         },
 959         {
 960                 .procname       = "tcp_notsent_lowat",
 961                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 962                 .maxlen         = sizeof(unsigned int),
 963                 .mode           = 0644,
 964                 .proc_handler   = proc_douintvec,
 965         },
 966         {
 967                 .procname       = "tcp_tw_reuse",
 968                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 969                 .maxlen         = sizeof(int),
 970                 .mode           = 0644,
 971                 .proc_handler   = proc_dointvec_minmax,
 972                 .extra1         = &zero,
 973                 .extra2         = &two,
 974         },
 975         {
 976                 .procname       = "tcp_max_tw_buckets",
 977                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 978                 .maxlen         = sizeof(int),
 979                 .mode           = 0644,
 980                 .proc_handler   = proc_dointvec
 981         },
 982         {
 983                 .procname       = "tcp_max_syn_backlog",
 984                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 985                 .maxlen         = sizeof(int),
 986                 .mode           = 0644,
 987                 .proc_handler   = proc_dointvec
 988         },
 989         {
 990                 .procname       = "tcp_fastopen",
 991                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 992                 .maxlen         = sizeof(int),
 993                 .mode           = 0644,
 994                 .proc_handler   = proc_dointvec,
 995         },
 996         {
 997                 .procname       = "tcp_fastopen_key",
 998                 .mode           = 0600,
 999                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1000                 /* maxlen to print the list of keys in hex (*2), with dashes
1001                  * separating doublewords and a comma in between keys.
1002                  */
1003                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1004                                    2 * TCP_FASTOPEN_KEY_MAX) +
1005                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1006                 .proc_handler   = proc_tcp_fastopen_key,
1007         },
1008         {
1009                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1010                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1011                 .maxlen         = sizeof(int),
1012                 .mode           = 0644,
1013                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1014                 .extra1         = &zero,
1015         },
1016 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1017         {
1018                 .procname       = "fib_multipath_use_neigh",
1019                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1020                 .maxlen         = sizeof(int),
1021                 .mode           = 0644,
1022                 .proc_handler   = proc_dointvec_minmax,
1023                 .extra1         = &zero,
1024                 .extra2         = &one,
1025         },
1026         {
1027                 .procname       = "fib_multipath_hash_policy",
1028                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1029                 .maxlen         = sizeof(int),
1030                 .mode           = 0644,
1031                 .proc_handler   = proc_fib_multipath_hash_policy,
1032                 .extra1         = &zero,
1033                 .extra2         = &two,
1034         },
1035 #endif
1036         {
1037                 .procname       = "ip_unprivileged_port_start",
1038                 .maxlen         = sizeof(int),
1039                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1040                 .mode           = 0644,
1041                 .proc_handler   = ipv4_privileged_ports,
1042         },
1043 #ifdef CONFIG_NET_L3_MASTER_DEV
1044         {
1045                 .procname       = "udp_l3mdev_accept",
1046                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1047                 .maxlen         = sizeof(int),
1048                 .mode           = 0644,
1049                 .proc_handler   = proc_dointvec_minmax,
1050                 .extra1         = &zero,
1051                 .extra2         = &one,
1052         },
1053 #endif
1054         {
1055                 .procname       = "tcp_sack",
1056                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1057                 .maxlen         = sizeof(int),
1058                 .mode           = 0644,
1059                 .proc_handler   = proc_dointvec
1060         },
1061         {
1062                 .procname       = "tcp_window_scaling",
1063                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1064                 .maxlen         = sizeof(int),
1065                 .mode           = 0644,
1066                 .proc_handler   = proc_dointvec
1067         },
1068         {
1069                 .procname       = "tcp_timestamps",
1070                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1071                 .maxlen         = sizeof(int),
1072                 .mode           = 0644,
1073                 .proc_handler   = proc_dointvec
1074         },
1075         {
1076                 .procname       = "tcp_early_retrans",
1077                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1078                 .maxlen         = sizeof(int),
1079                 .mode           = 0644,
1080                 .proc_handler   = proc_dointvec_minmax,
1081                 .extra1         = &zero,
1082                 .extra2         = &four,
1083         },
1084         {
1085                 .procname       = "tcp_recovery",
1086                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1087                 .maxlen         = sizeof(int),
1088                 .mode           = 0644,
1089                 .proc_handler   = proc_dointvec,
1090         },
1091         {
1092                 .procname       = "tcp_thin_linear_timeouts",
1093                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1094                 .maxlen         = sizeof(int),
1095                 .mode           = 0644,
1096                 .proc_handler   = proc_dointvec
1097         },
1098         {
1099                 .procname       = "tcp_slow_start_after_idle",
1100                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1101                 .maxlen         = sizeof(int),
1102                 .mode           = 0644,
1103                 .proc_handler   = proc_dointvec
1104         },
1105         {
1106                 .procname       = "tcp_retrans_collapse",
1107                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1108                 .maxlen         = sizeof(int),
1109                 .mode           = 0644,
1110                 .proc_handler   = proc_dointvec
1111         },
1112         {
1113                 .procname       = "tcp_stdurg",
1114                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1115                 .maxlen         = sizeof(int),
1116                 .mode           = 0644,
1117                 .proc_handler   = proc_dointvec
1118         },
1119         {
1120                 .procname       = "tcp_rfc1337",
1121                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1122                 .maxlen         = sizeof(int),
1123                 .mode           = 0644,
1124                 .proc_handler   = proc_dointvec
1125         },
1126         {
1127                 .procname       = "tcp_abort_on_overflow",
1128                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1129                 .maxlen         = sizeof(int),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dointvec
1132         },
1133         {
1134                 .procname       = "tcp_fack",
1135                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1136                 .maxlen         = sizeof(int),
1137                 .mode           = 0644,
1138                 .proc_handler   = proc_dointvec
1139         },
1140         {
1141                 .procname       = "tcp_max_reordering",
1142                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1143                 .maxlen         = sizeof(int),
1144                 .mode           = 0644,
1145                 .proc_handler   = proc_dointvec
1146         },
1147         {
1148                 .procname       = "tcp_dsack",
1149                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1150                 .maxlen         = sizeof(int),
1151                 .mode           = 0644,
1152                 .proc_handler   = proc_dointvec
1153         },
1154         {
1155                 .procname       = "tcp_app_win",
1156                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1157                 .maxlen         = sizeof(int),
1158                 .mode           = 0644,
1159                 .proc_handler   = proc_dointvec
1160         },
1161         {
1162                 .procname       = "tcp_adv_win_scale",
1163                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1164                 .maxlen         = sizeof(int),
1165                 .mode           = 0644,
1166                 .proc_handler   = proc_dointvec_minmax,
1167                 .extra1         = &tcp_adv_win_scale_min,
1168                 .extra2         = &tcp_adv_win_scale_max,
1169         },
1170         {
1171                 .procname       = "tcp_frto",
1172                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1173                 .maxlen         = sizeof(int),
1174                 .mode           = 0644,
1175                 .proc_handler   = proc_dointvec
1176         },
1177         {
1178                 .procname       = "tcp_no_metrics_save",
1179                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1180                 .maxlen         = sizeof(int),
1181                 .mode           = 0644,
1182                 .proc_handler   = proc_dointvec,
1183         },
1184         {
1185                 .procname       = "tcp_moderate_rcvbuf",
1186                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1187                 .maxlen         = sizeof(int),
1188                 .mode           = 0644,
1189                 .proc_handler   = proc_dointvec,
1190         },
1191         {
1192                 .procname       = "tcp_tso_win_divisor",
1193                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1194                 .maxlen         = sizeof(int),
1195                 .mode           = 0644,
1196                 .proc_handler   = proc_dointvec,
1197         },
1198         {
1199                 .procname       = "tcp_workaround_signed_windows",
1200                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1201                 .maxlen         = sizeof(int),
1202                 .mode           = 0644,
1203                 .proc_handler   = proc_dointvec
1204         },
1205         {
1206                 .procname       = "tcp_limit_output_bytes",
1207                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1208                 .maxlen         = sizeof(int),
1209                 .mode           = 0644,
1210                 .proc_handler   = proc_dointvec
1211         },
1212         {
1213                 .procname       = "tcp_challenge_ack_limit",
1214                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1215                 .maxlen         = sizeof(int),
1216                 .mode           = 0644,
1217                 .proc_handler   = proc_dointvec
1218         },
1219         {
1220                 .procname       = "tcp_min_tso_segs",
1221                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1222                 .maxlen         = sizeof(int),
1223                 .mode           = 0644,
1224                 .proc_handler   = proc_dointvec_minmax,
1225                 .extra1         = &one,
1226                 .extra2         = &gso_max_segs,
1227         },
1228         {
1229                 .procname       = "tcp_min_rtt_wlen",
1230                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1231                 .maxlen         = sizeof(int),
1232                 .mode           = 0644,
1233                 .proc_handler   = proc_dointvec_minmax,
1234                 .extra1         = &zero,
1235                 .extra2         = &one_day_secs
1236         },
1237         {
1238                 .procname       = "tcp_autocorking",
1239                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1240                 .maxlen         = sizeof(int),
1241                 .mode           = 0644,
1242                 .proc_handler   = proc_dointvec_minmax,
1243                 .extra1         = &zero,
1244                 .extra2         = &one,
1245         },
1246         {
1247                 .procname       = "tcp_invalid_ratelimit",
1248                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1249                 .maxlen         = sizeof(int),
1250                 .mode           = 0644,
1251                 .proc_handler   = proc_dointvec_ms_jiffies,
1252         },
1253         {
1254                 .procname       = "tcp_pacing_ss_ratio",
1255                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1256                 .maxlen         = sizeof(int),
1257                 .mode           = 0644,
1258                 .proc_handler   = proc_dointvec_minmax,
1259                 .extra1         = &zero,
1260                 .extra2         = &thousand,
1261         },
1262         {
1263                 .procname       = "tcp_pacing_ca_ratio",
1264                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1265                 .maxlen         = sizeof(int),
1266                 .mode           = 0644,
1267                 .proc_handler   = proc_dointvec_minmax,
1268                 .extra1         = &zero,
1269                 .extra2         = &thousand,
1270         },
1271         {
1272                 .procname       = "tcp_wmem",
1273                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1274                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1275                 .mode           = 0644,
1276                 .proc_handler   = proc_dointvec_minmax,
1277                 .extra1         = &one,
1278         },
1279         {
1280                 .procname       = "tcp_rmem",
1281                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1282                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1283                 .mode           = 0644,
1284                 .proc_handler   = proc_dointvec_minmax,
1285                 .extra1         = &one,
1286         },
1287         {
1288                 .procname       = "tcp_comp_sack_delay_ns",
1289                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1290                 .maxlen         = sizeof(unsigned long),
1291                 .mode           = 0644,
1292                 .proc_handler   = proc_doulongvec_minmax,
1293         },
1294         {
1295                 .procname       = "tcp_comp_sack_nr",
1296                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1297                 .maxlen         = sizeof(int),
1298                 .mode           = 0644,
1299                 .proc_handler   = proc_dointvec_minmax,
1300                 .extra1         = &zero,
1301                 .extra2         = &comp_sack_nr_max,
1302         },
1303         {
1304                 .procname       = "udp_rmem_min",
1305                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1306                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1307                 .mode           = 0644,
1308                 .proc_handler   = proc_dointvec_minmax,
1309                 .extra1         = &one
1310         },
1311         {
1312                 .procname       = "udp_wmem_min",
1313                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1314                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1315                 .mode           = 0644,
1316                 .proc_handler   = proc_dointvec_minmax,
1317                 .extra1         = &one
1318         },
1319         { }
1320 };
1321
1322 static __net_init int ipv4_sysctl_init_net(struct net *net)
1323 {
1324         struct ctl_table *table;
1325
1326         table = ipv4_net_table;
1327         if (!net_eq(net, &init_net)) {
1328                 int i;
1329
1330                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1331                 if (!table)
1332                         goto err_alloc;
1333
1334                 /* Update the variables to point into the current struct net */
1335                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1336                         table[i].data += (void *)net - (void *)&init_net;
1337         }
1338
1339         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1340         if (!net->ipv4.ipv4_hdr)
1341                 goto err_reg;
1342
1343         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1344         if (!net->ipv4.sysctl_local_reserved_ports)
1345                 goto err_ports;
1346
1347         return 0;
1348
1349 err_ports:
1350         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1351 err_reg:
1352         if (!net_eq(net, &init_net))
1353                 kfree(table);
1354 err_alloc:
1355         return -ENOMEM;
1356 }
1357
1358 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1359 {
1360         struct ctl_table *table;
1361
1362         kfree(net->ipv4.sysctl_local_reserved_ports);
1363         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1364         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1365         kfree(table);
1366 }
1367
1368 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1369         .init = ipv4_sysctl_init_net,
1370         .exit = ipv4_sysctl_exit_net,
1371 };
1372
1373 static __init int sysctl_ipv4_init(void)
1374 {
1375         struct ctl_table_header *hdr;
1376
1377         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1378         if (!hdr)
1379                 return -ENOMEM;
1380
1381         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1382                 unregister_net_sysctl_table(hdr);
1383                 return -ENOMEM;
1384         }
1385
1386         return 0;
1387 }
1388
1389 __initcall(sysctl_ipv4_init);