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 *buffer, size_t *lenp, loff_t *ppos)
  75 {
  76         struct net *net =
  77                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  78         int ret;
  79         int range[2];
  80         struct ctl_table tmp = {
  81                 .data = &range,
  82                 .maxlen = sizeof(range),
  83                 .mode = table->mode,
  84                 .extra1 = &ip_local_port_range_min,
  85                 .extra2 = &ip_local_port_range_max,
  86         };
  87
  88         inet_get_local_port_range(net, &range[0], &range[1]);
  89
  90         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  91
  92         if (write && ret == 0) {
  93                 /* Ensure that the upper limit is not smaller than the lower,
  94                  * and that the lower does not encroach upon the privileged
  95                  * port limit.
  96                  */
  97                 if ((range[1] < range[0]) ||
  98                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
  99                         ret = -EINVAL;
 100                 else
 101                         set_local_port_range(net, range);
 102         }
 103
 104         return ret;
 105 }
 106
 107 /* Validate changes from /proc interface. */
 108 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 109                                 void *buffer, size_t *lenp, loff_t *ppos)
 110 {
 111         struct net *net = container_of(table->data, struct net,
 112             ipv4.sysctl_ip_prot_sock);
 113         int ret;
 114         int pports;
 115         int range[2];
 116         struct ctl_table tmp = {
 117                 .data = &pports,
 118                 .maxlen = sizeof(pports),
 119                 .mode = table->mode,
 120                 .extra1 = &ip_privileged_port_min,
 121                 .extra2 = &ip_privileged_port_max,
 122         };
 123
 124         pports = net->ipv4.sysctl_ip_prot_sock;
 125
 126         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 127
 128         if (write && ret == 0) {
 129                 inet_get_local_port_range(net, &range[0], &range[1]);
 130                 /* Ensure that the local port range doesn't overlap with the
 131                  * privileged port range.
 132                  */
 133                 if (range[0] < pports)
 134                         ret = -EINVAL;
 135                 else
 136                         net->ipv4.sysctl_ip_prot_sock = pports;
 137         }
 138
 139         return ret;
 140 }
 141
 142 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 143 {
 144         kgid_t *data = table->data;
 145         struct net *net =
 146                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 147         unsigned int seq;
 148         do {
 149                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 150
 151                 *low = data[0];
 152                 *high = data[1];
 153         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 154 }
 155
 156 /* Update system visible IP port range */
 157 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 158 {
 159         kgid_t *data = table->data;
 160         struct net *net =
 161                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 162         write_seqlock(&net->ipv4.ping_group_range.lock);
 163         data[0] = low;
 164         data[1] = high;
 165         write_sequnlock(&net->ipv4.ping_group_range.lock);
 166 }
 167
 168 /* Validate changes from /proc interface. */
 169 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 170                                  void *buffer, size_t *lenp, loff_t *ppos)
 171 {
 172         struct user_namespace *user_ns = current_user_ns();
 173         int ret;
 174         gid_t urange[2];
 175         kgid_t low, high;
 176         struct ctl_table tmp = {
 177                 .data = &urange,
 178                 .maxlen = sizeof(urange),
 179                 .mode = table->mode,
 180                 .extra1 = &ip_ping_group_range_min,
 181                 .extra2 = &ip_ping_group_range_max,
 182         };
 183
 184         inet_get_ping_group_range_table(table, &low, &high);
 185         urange[0] = from_kgid_munged(user_ns, low);
 186         urange[1] = from_kgid_munged(user_ns, high);
 187         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 188
 189         if (write && ret == 0) {
 190                 low = make_kgid(user_ns, urange[0]);
 191                 high = make_kgid(user_ns, urange[1]);
 192                 if (!gid_valid(low) || !gid_valid(high))
 193                         return -EINVAL;
 194                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 195                         low = make_kgid(&init_user_ns, 1);
 196                         high = make_kgid(&init_user_ns, 0);
 197                 }
 198                 set_ping_group_range(table, low, high);
 199         }
 200
 201         return ret;
 202 }
 203
 204 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 205                                     void *buffer, size_t *lenp, loff_t *ppos)
 206 {
 207         struct net *net;
 208         int ret;
 209
 210         net = container_of(table->data, struct net,
 211                            ipv4.sysctl_ip_fwd_update_priority);
 212         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 213         if (write && ret == 0)
 214                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 215                                         net);
 216
 217         return ret;
 218 }
 219
 220 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 221                                        void *buffer, size_t *lenp, loff_t *ppos)
 222 {
 223         struct net *net = container_of(ctl->data, struct net,
 224                                        ipv4.tcp_congestion_control);
 225         char val[TCP_CA_NAME_MAX];
 226         struct ctl_table tbl = {
 227                 .data = val,
 228                 .maxlen = TCP_CA_NAME_MAX,
 229         };
 230         int ret;
 231
 232         tcp_get_default_congestion_control(net, val);
 233
 234         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 235         if (write && ret == 0)
 236                 ret = tcp_set_default_congestion_control(net, val);
 237         return ret;
 238 }
 239
 240 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 241                                                  int write, void *buffer,
 242                                                  size_t *lenp, loff_t *ppos)
 243 {
 244         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 245         int ret;
 246
 247         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 248         if (!tbl.data)
 249                 return -ENOMEM;
 250         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 251         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 252         kfree(tbl.data);
 253         return ret;
 254 }
 255
 256 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 257                                            int write, void *buffer,
 258                                            size_t *lenp, loff_t *ppos)
 259 {
 260         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 261         int ret;
 262
 263         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 264         if (!tbl.data)
 265                 return -ENOMEM;
 266
 267         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 268         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 269         if (write && ret == 0)
 270                 ret = tcp_set_allowed_congestion_control(tbl.data);
 271         kfree(tbl.data);
 272         return ret;
 273 }
 274
 275 static int sscanf_key(char *buf, __le32 *key)
 276 {
 277         u32 user_key[4];
 278         int i, ret = 0;
 279
 280         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 281                    user_key + 2, user_key + 3) != 4) {
 282                 ret = -EINVAL;
 283         } else {
 284                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 285                         key[i] = cpu_to_le32(user_key[i]);
 286         }
 287         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 288                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 289
 290         return ret;
 291 }
 292
 293 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 294                                  void *buffer, size_t *lenp, loff_t *ppos)
 295 {
 296         struct net *net = container_of(table->data, struct net,
 297             ipv4.sysctl_tcp_fastopen);
 298         /* maxlen to print the list of keys in hex (*2), with dashes
 299          * separating doublewords and a comma in between keys.
 300          */
 301         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 302                                             2 * TCP_FASTOPEN_KEY_MAX) +
 303                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 304         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 305         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 306         char *backup_data;
 307         int ret, i = 0, off = 0, n_keys;
 308
 309         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 310         if (!tbl.data)
 311                 return -ENOMEM;
 312
 313         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 314         if (!n_keys) {
 315                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 316                 n_keys = 1;
 317         }
 318
 319         for (i = 0; i < n_keys * 4; i++)
 320                 user_key[i] = le32_to_cpu(key[i]);
 321
 322         for (i = 0; i < n_keys; i++) {
 323                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 324                                 "%08x-%08x-%08x-%08x",
 325                                 user_key[i * 4],
 326                                 user_key[i * 4 + 1],
 327                                 user_key[i * 4 + 2],
 328                                 user_key[i * 4 + 3]);
 329
 330                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 331                         break;
 332
 333                 if (i + 1 < n_keys)
 334                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 335         }
 336
 337         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 338
 339         if (write && ret == 0) {
 340                 backup_data = strchr(tbl.data, ',');
 341                 if (backup_data) {
 342                         *backup_data = '\0';
 343                         backup_data++;
 344                 }
 345                 if (sscanf_key(tbl.data, key)) {
 346                         ret = -EINVAL;
 347                         goto bad_key;
 348                 }
 349                 if (backup_data) {
 350                         if (sscanf_key(backup_data, key + 4)) {
 351                                 ret = -EINVAL;
 352                                 goto bad_key;
 353                         }
 354                 }
 355                 tcp_fastopen_reset_cipher(net, NULL, key,
 356                                           backup_data ? key + 4 : NULL);
 357         }
 358
 359 bad_key:
 360         kfree(tbl.data);
 361         return ret;
 362 }
 363
 364 static void proc_configure_early_demux(int enabled, int protocol)
 365 {
 366         struct net_protocol *ipprot;
 367 #if IS_ENABLED(CONFIG_IPV6)
 368         struct inet6_protocol *ip6prot;
 369 #endif
 370
 371         rcu_read_lock();
 372
 373         ipprot = rcu_dereference(inet_protos[protocol]);
 374         if (ipprot)
 375                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 376                                                 NULL;
 377
 378 #if IS_ENABLED(CONFIG_IPV6)
 379         ip6prot = rcu_dereference(inet6_protos[protocol]);
 380         if (ip6prot)
 381                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 382                                                  NULL;
 383 #endif
 384         rcu_read_unlock();
 385 }
 386
 387 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 388                                 void *buffer, size_t *lenp, loff_t *ppos)
 389 {
 390         int ret = 0;
 391
 392         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 393
 394         if (write && !ret) {
 395                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 396
 397                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 398         }
 399
 400         return ret;
 401 }
 402
 403 static int proc_udp_early_demux(struct ctl_table *table, int write,
 404                                 void *buffer, size_t *lenp, loff_t *ppos)
 405 {
 406         int ret = 0;
 407
 408         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 409
 410         if (write && !ret) {
 411                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 412
 413                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 414         }
 415
 416         return ret;
 417 }
 418
 419 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 420                                              int write, void *buffer,
 421                                              size_t *lenp, loff_t *ppos)
 422 {
 423         struct net *net = container_of(table->data, struct net,
 424             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 425         int ret;
 426
 427         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 428         if (write && ret == 0)
 429                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 430
 431         return ret;
 432 }
 433
 434 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 435                                   int write, void *buffer, size_t *lenp,
 436                                   loff_t *ppos)
 437 {
 438         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 439         int ret;
 440
 441         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 442         if (!tbl.data)
 443                 return -ENOMEM;
 444         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 445         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 446         kfree(tbl.data);
 447
 448         return ret;
 449 }
 450
 451 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 452 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 453                                           void *buffer, size_t *lenp,
 454                                           loff_t *ppos)
 455 {
 456         struct net *net = container_of(table->data, struct net,
 457             ipv4.sysctl_fib_multipath_hash_policy);
 458         int ret;
 459
 460         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 461         if (write && ret == 0)
 462                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 463
 464         return ret;
 465 }
 466 #endif
 467
 468 static struct ctl_table ipv4_table[] = {
 469         {
 470                 .procname       = "tcp_max_orphans",
 471                 .data           = &sysctl_tcp_max_orphans,
 472                 .maxlen         = sizeof(int),
 473                 .mode           = 0644,
 474                 .proc_handler   = proc_dointvec
 475         },
 476         {
 477                 .procname       = "inet_peer_threshold",
 478                 .data           = &inet_peer_threshold,
 479                 .maxlen         = sizeof(int),
 480                 .mode           = 0644,
 481                 .proc_handler   = proc_dointvec
 482         },
 483         {
 484                 .procname       = "inet_peer_minttl",
 485                 .data           = &inet_peer_minttl,
 486                 .maxlen         = sizeof(int),
 487                 .mode           = 0644,
 488                 .proc_handler   = proc_dointvec_jiffies,
 489         },
 490         {
 491                 .procname       = "inet_peer_maxttl",
 492                 .data           = &inet_peer_maxttl,
 493                 .maxlen         = sizeof(int),
 494                 .mode           = 0644,
 495                 .proc_handler   = proc_dointvec_jiffies,
 496         },
 497         {
 498                 .procname       = "tcp_mem",
 499                 .maxlen         = sizeof(sysctl_tcp_mem),
 500                 .data           = &sysctl_tcp_mem,
 501                 .mode           = 0644,
 502                 .proc_handler   = proc_doulongvec_minmax,
 503         },
 504         {
 505                 .procname       = "tcp_low_latency",
 506                 .data           = &sysctl_tcp_low_latency,
 507                 .maxlen         = sizeof(int),
 508                 .mode           = 0644,
 509                 .proc_handler   = proc_dointvec
 510         },
 511 #ifdef CONFIG_NETLABEL
 512         {
 513                 .procname       = "cipso_cache_enable",
 514                 .data           = &cipso_v4_cache_enabled,
 515                 .maxlen         = sizeof(int),
 516                 .mode           = 0644,
 517                 .proc_handler   = proc_dointvec,
 518         },
 519         {
 520                 .procname       = "cipso_cache_bucket_size",
 521                 .data           = &cipso_v4_cache_bucketsize,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = proc_dointvec,
 525         },
 526         {
 527                 .procname       = "cipso_rbm_optfmt",
 528                 .data           = &cipso_v4_rbm_optfmt,
 529                 .maxlen         = sizeof(int),
 530                 .mode           = 0644,
 531                 .proc_handler   = proc_dointvec,
 532         },
 533         {
 534                 .procname       = "cipso_rbm_strictvalid",
 535                 .data           = &cipso_v4_rbm_strictvalid,
 536                 .maxlen         = sizeof(int),
 537                 .mode           = 0644,
 538                 .proc_handler   = proc_dointvec,
 539         },
 540 #endif /* CONFIG_NETLABEL */
 541         {
 542                 .procname       = "tcp_available_ulp",
 543                 .maxlen         = TCP_ULP_BUF_MAX,
 544                 .mode           = 0444,
 545                 .proc_handler   = proc_tcp_available_ulp,
 546         },
 547         {
 548                 .procname       = "icmp_msgs_per_sec",
 549                 .data           = &sysctl_icmp_msgs_per_sec,
 550                 .maxlen         = sizeof(int),
 551                 .mode           = 0644,
 552                 .proc_handler   = proc_dointvec_minmax,
 553                 .extra1         = SYSCTL_ZERO,
 554         },
 555         {
 556                 .procname       = "icmp_msgs_burst",
 557                 .data           = &sysctl_icmp_msgs_burst,
 558                 .maxlen         = sizeof(int),
 559                 .mode           = 0644,
 560                 .proc_handler   = proc_dointvec_minmax,
 561                 .extra1         = SYSCTL_ZERO,
 562         },
 563         {
 564                 .procname       = "udp_mem",
 565                 .data           = &sysctl_udp_mem,
 566                 .maxlen         = sizeof(sysctl_udp_mem),
 567                 .mode           = 0644,
 568                 .proc_handler   = proc_doulongvec_minmax,
 569         },
 570         {
 571                 .procname       = "fib_sync_mem",
 572                 .data           = &sysctl_fib_sync_mem,
 573                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 574                 .mode           = 0644,
 575                 .proc_handler   = proc_douintvec_minmax,
 576                 .extra1         = &sysctl_fib_sync_mem_min,
 577                 .extra2         = &sysctl_fib_sync_mem_max,
 578         },
 579         {
 580                 .procname       = "tcp_rx_skb_cache",
 581                 .data           = &tcp_rx_skb_cache_key.key,
 582                 .mode           = 0644,
 583                 .proc_handler   = proc_do_static_key,
 584         },
 585         {
 586                 .procname       = "tcp_tx_skb_cache",
 587                 .data           = &tcp_tx_skb_cache_key.key,
 588                 .mode           = 0644,
 589                 .proc_handler   = proc_do_static_key,
 590         },
 591         { }
 592 };
 593
 594 static struct ctl_table ipv4_net_table[] = {
 595         {
 596                 .procname       = "icmp_echo_ignore_all",
 597                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 598                 .maxlen         = sizeof(int),
 599                 .mode           = 0644,
 600                 .proc_handler   = proc_dointvec
 601         },
 602         {
 603                 .procname       = "icmp_echo_ignore_broadcasts",
 604                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 605                 .maxlen         = sizeof(int),
 606                 .mode           = 0644,
 607                 .proc_handler   = proc_dointvec
 608         },
 609         {
 610                 .procname       = "icmp_ignore_bogus_error_responses",
 611                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 612                 .maxlen         = sizeof(int),
 613                 .mode           = 0644,
 614                 .proc_handler   = proc_dointvec
 615         },
 616         {
 617                 .procname       = "icmp_errors_use_inbound_ifaddr",
 618                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 619                 .maxlen         = sizeof(int),
 620                 .mode           = 0644,
 621                 .proc_handler   = proc_dointvec
 622         },
 623         {
 624                 .procname       = "icmp_ratelimit",
 625                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 626                 .maxlen         = sizeof(int),
 627                 .mode           = 0644,
 628                 .proc_handler   = proc_dointvec_ms_jiffies,
 629         },
 630         {
 631                 .procname       = "icmp_ratemask",
 632                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 633                 .maxlen         = sizeof(int),
 634                 .mode           = 0644,
 635                 .proc_handler   = proc_dointvec
 636         },
 637         {
 638                 .procname       = "ping_group_range",
 639                 .data           = &init_net.ipv4.ping_group_range.range,
 640                 .maxlen         = sizeof(gid_t)*2,
 641                 .mode           = 0644,
 642                 .proc_handler   = ipv4_ping_group_range,
 643         },
 644 #ifdef CONFIG_NET_L3_MASTER_DEV
 645         {
 646                 .procname       = "raw_l3mdev_accept",
 647                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 648                 .maxlen         = sizeof(int),
 649                 .mode           = 0644,
 650                 .proc_handler   = proc_dointvec_minmax,
 651                 .extra1         = SYSCTL_ZERO,
 652                 .extra2         = SYSCTL_ONE,
 653         },
 654 #endif
 655         {
 656                 .procname       = "tcp_ecn",
 657                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 658                 .maxlen         = sizeof(int),
 659                 .mode           = 0644,
 660                 .proc_handler   = proc_dointvec
 661         },
 662         {
 663                 .procname       = "tcp_ecn_fallback",
 664                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 665                 .maxlen         = sizeof(int),
 666                 .mode           = 0644,
 667                 .proc_handler   = proc_dointvec
 668         },
 669         {
 670                 .procname       = "ip_dynaddr",
 671                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = proc_dointvec
 675         },
 676         {
 677                 .procname       = "ip_early_demux",
 678                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 679                 .maxlen         = sizeof(int),
 680                 .mode           = 0644,
 681                 .proc_handler   = proc_dointvec
 682         },
 683         {
 684                 .procname       = "udp_early_demux",
 685                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 686                 .maxlen         = sizeof(int),
 687                 .mode           = 0644,
 688                 .proc_handler   = proc_udp_early_demux
 689         },
 690         {
 691                 .procname       = "tcp_early_demux",
 692                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 693                 .maxlen         = sizeof(int),
 694                 .mode           = 0644,
 695                 .proc_handler   = proc_tcp_early_demux
 696         },
 697         {
 698                 .procname       = "nexthop_compat_mode",
 699                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 700                 .maxlen         = sizeof(int),
 701                 .mode           = 0644,
 702                 .proc_handler   = proc_dointvec_minmax,
 703                 .extra1         = SYSCTL_ZERO,
 704                 .extra2         = SYSCTL_ONE,
 705         },
 706         {
 707                 .procname       = "ip_default_ttl",
 708                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 709                 .maxlen         = sizeof(int),
 710                 .mode           = 0644,
 711                 .proc_handler   = proc_dointvec_minmax,
 712                 .extra1         = &ip_ttl_min,
 713                 .extra2         = &ip_ttl_max,
 714         },
 715         {
 716                 .procname       = "ip_local_port_range",
 717                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 718                 .data           = &init_net.ipv4.ip_local_ports.range,
 719                 .mode           = 0644,
 720                 .proc_handler   = ipv4_local_port_range,
 721         },
 722         {
 723                 .procname       = "ip_local_reserved_ports",
 724                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 725                 .maxlen         = 65536,
 726                 .mode           = 0644,
 727                 .proc_handler   = proc_do_large_bitmap,
 728         },
 729         {
 730                 .procname       = "ip_no_pmtu_disc",
 731                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 732                 .maxlen         = sizeof(int),
 733                 .mode           = 0644,
 734                 .proc_handler   = proc_dointvec
 735         },
 736         {
 737                 .procname       = "ip_forward_use_pmtu",
 738                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 739                 .maxlen         = sizeof(int),
 740                 .mode           = 0644,
 741                 .proc_handler   = proc_dointvec,
 742         },
 743         {
 744                 .procname       = "ip_forward_update_priority",
 745                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 746                 .maxlen         = sizeof(int),
 747                 .mode           = 0644,
 748                 .proc_handler   = ipv4_fwd_update_priority,
 749                 .extra1         = SYSCTL_ZERO,
 750                 .extra2         = SYSCTL_ONE,
 751         },
 752         {
 753                 .procname       = "ip_nonlocal_bind",
 754                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 755                 .maxlen         = sizeof(int),
 756                 .mode           = 0644,
 757                 .proc_handler   = proc_dointvec
 758         },
 759         {
 760                 .procname       = "ip_autobind_reuse",
 761                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 762                 .maxlen         = sizeof(int),
 763                 .mode           = 0644,
 764                 .proc_handler   = proc_dointvec_minmax,
 765                 .extra1         = SYSCTL_ZERO,
 766                 .extra2         = SYSCTL_ONE,
 767         },
 768         {
 769                 .procname       = "fwmark_reflect",
 770                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 771                 .maxlen         = sizeof(int),
 772                 .mode           = 0644,
 773                 .proc_handler   = proc_dointvec,
 774         },
 775         {
 776                 .procname       = "tcp_fwmark_accept",
 777                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 778                 .maxlen         = sizeof(int),
 779                 .mode           = 0644,
 780                 .proc_handler   = proc_dointvec,
 781         },
 782 #ifdef CONFIG_NET_L3_MASTER_DEV
 783         {
 784                 .procname       = "tcp_l3mdev_accept",
 785                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 786                 .maxlen         = sizeof(int),
 787                 .mode           = 0644,
 788                 .proc_handler   = proc_dointvec_minmax,
 789                 .extra1         = SYSCTL_ZERO,
 790                 .extra2         = SYSCTL_ONE,
 791         },
 792 #endif
 793         {
 794                 .procname       = "tcp_mtu_probing",
 795                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 796                 .maxlen         = sizeof(int),
 797                 .mode           = 0644,
 798                 .proc_handler   = proc_dointvec,
 799         },
 800         {
 801                 .procname       = "tcp_base_mss",
 802                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 803                 .maxlen         = sizeof(int),
 804                 .mode           = 0644,
 805                 .proc_handler   = proc_dointvec,
 806         },
 807         {
 808                 .procname       = "tcp_min_snd_mss",
 809                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 810                 .maxlen         = sizeof(int),
 811                 .mode           = 0644,
 812                 .proc_handler   = proc_dointvec_minmax,
 813                 .extra1         = &tcp_min_snd_mss_min,
 814                 .extra2         = &tcp_min_snd_mss_max,
 815         },
 816         {
 817                 .procname       = "tcp_mtu_probe_floor",
 818                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 819                 .maxlen         = sizeof(int),
 820                 .mode           = 0644,
 821                 .proc_handler   = proc_dointvec_minmax,
 822                 .extra1         = &tcp_min_snd_mss_min,
 823                 .extra2         = &tcp_min_snd_mss_max,
 824         },
 825         {
 826                 .procname       = "tcp_probe_threshold",
 827                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 828                 .maxlen         = sizeof(int),
 829                 .mode           = 0644,
 830                 .proc_handler   = proc_dointvec,
 831         },
 832         {
 833                 .procname       = "tcp_probe_interval",
 834                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 835                 .maxlen         = sizeof(u32),
 836                 .mode           = 0644,
 837                 .proc_handler   = proc_douintvec_minmax,
 838                 .extra2         = &u32_max_div_HZ,
 839         },
 840         {
 841                 .procname       = "igmp_link_local_mcast_reports",
 842                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 843                 .maxlen         = sizeof(int),
 844                 .mode           = 0644,
 845                 .proc_handler   = proc_dointvec
 846         },
 847         {
 848                 .procname       = "igmp_max_memberships",
 849                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 850                 .maxlen         = sizeof(int),
 851                 .mode           = 0644,
 852                 .proc_handler   = proc_dointvec
 853         },
 854         {
 855                 .procname       = "igmp_max_msf",
 856                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 857                 .maxlen         = sizeof(int),
 858                 .mode           = 0644,
 859                 .proc_handler   = proc_dointvec
 860         },
 861 #ifdef CONFIG_IP_MULTICAST
 862         {
 863                 .procname       = "igmp_qrv",
 864                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 865                 .maxlen         = sizeof(int),
 866                 .mode           = 0644,
 867                 .proc_handler   = proc_dointvec_minmax,
 868                 .extra1         = SYSCTL_ONE
 869         },
 870 #endif
 871         {
 872                 .procname       = "tcp_congestion_control",
 873                 .data           = &init_net.ipv4.tcp_congestion_control,
 874                 .mode           = 0644,
 875                 .maxlen         = TCP_CA_NAME_MAX,
 876                 .proc_handler   = proc_tcp_congestion_control,
 877         },
 878         {
 879                 .procname       = "tcp_available_congestion_control",
 880                 .maxlen         = TCP_CA_BUF_MAX,
 881                 .mode           = 0444,
 882                 .proc_handler   = proc_tcp_available_congestion_control,
 883         },
 884         {
 885                 .procname       = "tcp_allowed_congestion_control",
 886                 .maxlen         = TCP_CA_BUF_MAX,
 887                 .mode           = 0644,
 888                 .proc_handler   = proc_allowed_congestion_control,
 889         },
 890         {
 891                 .procname       = "tcp_keepalive_time",
 892                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 893                 .maxlen         = sizeof(int),
 894                 .mode           = 0644,
 895                 .proc_handler   = proc_dointvec_jiffies,
 896         },
 897         {
 898                 .procname       = "tcp_keepalive_probes",
 899                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 900                 .maxlen         = sizeof(int),
 901                 .mode           = 0644,
 902                 .proc_handler   = proc_dointvec
 903         },
 904         {
 905                 .procname       = "tcp_keepalive_intvl",
 906                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 907                 .maxlen         = sizeof(int),
 908                 .mode           = 0644,
 909                 .proc_handler   = proc_dointvec_jiffies,
 910         },
 911         {
 912                 .procname       = "tcp_syn_retries",
 913                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 914                 .maxlen         = sizeof(int),
 915                 .mode           = 0644,
 916                 .proc_handler   = proc_dointvec_minmax,
 917                 .extra1         = &tcp_syn_retries_min,
 918                 .extra2         = &tcp_syn_retries_max
 919         },
 920         {
 921                 .procname       = "tcp_synack_retries",
 922                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 923                 .maxlen         = sizeof(int),
 924                 .mode           = 0644,
 925                 .proc_handler   = proc_dointvec
 926         },
 927 #ifdef CONFIG_SYN_COOKIES
 928         {
 929                 .procname       = "tcp_syncookies",
 930                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 931                 .maxlen         = sizeof(int),
 932                 .mode           = 0644,
 933                 .proc_handler   = proc_dointvec
 934         },
 935 #endif
 936         {
 937                 .procname       = "tcp_reordering",
 938                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 939                 .maxlen         = sizeof(int),
 940                 .mode           = 0644,
 941                 .proc_handler   = proc_dointvec
 942         },
 943         {
 944                 .procname       = "tcp_retries1",
 945                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 946                 .maxlen         = sizeof(int),
 947                 .mode           = 0644,
 948                 .proc_handler   = proc_dointvec_minmax,
 949                 .extra2         = &tcp_retr1_max
 950         },
 951         {
 952                 .procname       = "tcp_retries2",
 953                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 954                 .maxlen         = sizeof(int),
 955                 .mode           = 0644,
 956                 .proc_handler   = proc_dointvec
 957         },
 958         {
 959                 .procname       = "tcp_orphan_retries",
 960                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 961                 .maxlen         = sizeof(int),
 962                 .mode           = 0644,
 963                 .proc_handler   = proc_dointvec
 964         },
 965         {
 966                 .procname       = "tcp_fin_timeout",
 967                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 968                 .maxlen         = sizeof(int),
 969                 .mode           = 0644,
 970                 .proc_handler   = proc_dointvec_jiffies,
 971         },
 972         {
 973                 .procname       = "tcp_notsent_lowat",
 974                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 975                 .maxlen         = sizeof(unsigned int),
 976                 .mode           = 0644,
 977                 .proc_handler   = proc_douintvec,
 978         },
 979         {
 980                 .procname       = "tcp_tw_reuse",
 981                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 982                 .maxlen         = sizeof(int),
 983                 .mode           = 0644,
 984                 .proc_handler   = proc_dointvec_minmax,
 985                 .extra1         = SYSCTL_ZERO,
 986                 .extra2         = &two,
 987         },
 988         {
 989                 .procname       = "tcp_max_tw_buckets",
 990                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 991                 .maxlen         = sizeof(int),
 992                 .mode           = 0644,
 993                 .proc_handler   = proc_dointvec
 994         },
 995         {
 996                 .procname       = "tcp_max_syn_backlog",
 997                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 998                 .maxlen         = sizeof(int),
 999                 .mode           = 0644,
1000                 .proc_handler   = proc_dointvec
1001         },
1002         {
1003                 .procname       = "tcp_fastopen",
1004                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1005                 .maxlen         = sizeof(int),
1006                 .mode           = 0644,
1007                 .proc_handler   = proc_dointvec,
1008         },
1009         {
1010                 .procname       = "tcp_fastopen_key",
1011                 .mode           = 0600,
1012                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1013                 /* maxlen to print the list of keys in hex (*2), with dashes
1014                  * separating doublewords and a comma in between keys.
1015                  */
1016                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1017                                    2 * TCP_FASTOPEN_KEY_MAX) +
1018                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1019                 .proc_handler   = proc_tcp_fastopen_key,
1020         },
1021         {
1022                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1023                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1024                 .maxlen         = sizeof(int),
1025                 .mode           = 0644,
1026                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1027                 .extra1         = SYSCTL_ZERO,
1028         },
1029 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1030         {
1031                 .procname       = "fib_multipath_use_neigh",
1032                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1033                 .maxlen         = sizeof(int),
1034                 .mode           = 0644,
1035                 .proc_handler   = proc_dointvec_minmax,
1036                 .extra1         = SYSCTL_ZERO,
1037                 .extra2         = SYSCTL_ONE,
1038         },
1039         {
1040                 .procname       = "fib_multipath_hash_policy",
1041                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1042                 .maxlen         = sizeof(int),
1043                 .mode           = 0644,
1044                 .proc_handler   = proc_fib_multipath_hash_policy,
1045                 .extra1         = SYSCTL_ZERO,
1046                 .extra2         = &two,
1047         },
1048 #endif
1049         {
1050                 .procname       = "ip_unprivileged_port_start",
1051                 .maxlen         = sizeof(int),
1052                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1053                 .mode           = 0644,
1054                 .proc_handler   = ipv4_privileged_ports,
1055         },
1056 #ifdef CONFIG_NET_L3_MASTER_DEV
1057         {
1058                 .procname       = "udp_l3mdev_accept",
1059                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1060                 .maxlen         = sizeof(int),
1061                 .mode           = 0644,
1062                 .proc_handler   = proc_dointvec_minmax,
1063                 .extra1         = SYSCTL_ZERO,
1064                 .extra2         = SYSCTL_ONE,
1065         },
1066 #endif
1067         {
1068                 .procname       = "tcp_sack",
1069                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1070                 .maxlen         = sizeof(int),
1071                 .mode           = 0644,
1072                 .proc_handler   = proc_dointvec
1073         },
1074         {
1075                 .procname       = "tcp_window_scaling",
1076                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1077                 .maxlen         = sizeof(int),
1078                 .mode           = 0644,
1079                 .proc_handler   = proc_dointvec
1080         },
1081         {
1082                 .procname       = "tcp_timestamps",
1083                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1084                 .maxlen         = sizeof(int),
1085                 .mode           = 0644,
1086                 .proc_handler   = proc_dointvec
1087         },
1088         {
1089                 .procname       = "tcp_early_retrans",
1090                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1091                 .maxlen         = sizeof(int),
1092                 .mode           = 0644,
1093                 .proc_handler   = proc_dointvec_minmax,
1094                 .extra1         = SYSCTL_ZERO,
1095                 .extra2         = &four,
1096         },
1097         {
1098                 .procname       = "tcp_recovery",
1099                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1100                 .maxlen         = sizeof(int),
1101                 .mode           = 0644,
1102                 .proc_handler   = proc_dointvec,
1103         },
1104         {
1105                 .procname       = "tcp_thin_linear_timeouts",
1106                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1107                 .maxlen         = sizeof(int),
1108                 .mode           = 0644,
1109                 .proc_handler   = proc_dointvec
1110         },
1111         {
1112                 .procname       = "tcp_slow_start_after_idle",
1113                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1114                 .maxlen         = sizeof(int),
1115                 .mode           = 0644,
1116                 .proc_handler   = proc_dointvec
1117         },
1118         {
1119                 .procname       = "tcp_retrans_collapse",
1120                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1121                 .maxlen         = sizeof(int),
1122                 .mode           = 0644,
1123                 .proc_handler   = proc_dointvec
1124         },
1125         {
1126                 .procname       = "tcp_stdurg",
1127                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1128                 .maxlen         = sizeof(int),
1129                 .mode           = 0644,
1130                 .proc_handler   = proc_dointvec
1131         },
1132         {
1133                 .procname       = "tcp_rfc1337",
1134                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1135                 .maxlen         = sizeof(int),
1136                 .mode           = 0644,
1137                 .proc_handler   = proc_dointvec
1138         },
1139         {
1140                 .procname       = "tcp_abort_on_overflow",
1141                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1142                 .maxlen         = sizeof(int),
1143                 .mode           = 0644,
1144                 .proc_handler   = proc_dointvec
1145         },
1146         {
1147                 .procname       = "tcp_fack",
1148                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1149                 .maxlen         = sizeof(int),
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dointvec
1152         },
1153         {
1154                 .procname       = "tcp_max_reordering",
1155                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1156                 .maxlen         = sizeof(int),
1157                 .mode           = 0644,
1158                 .proc_handler   = proc_dointvec
1159         },
1160         {
1161                 .procname       = "tcp_dsack",
1162                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1163                 .maxlen         = sizeof(int),
1164                 .mode           = 0644,
1165                 .proc_handler   = proc_dointvec
1166         },
1167         {
1168                 .procname       = "tcp_app_win",
1169                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1170                 .maxlen         = sizeof(int),
1171                 .mode           = 0644,
1172                 .proc_handler   = proc_dointvec
1173         },
1174         {
1175                 .procname       = "tcp_adv_win_scale",
1176                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1177                 .maxlen         = sizeof(int),
1178                 .mode           = 0644,
1179                 .proc_handler   = proc_dointvec_minmax,
1180                 .extra1         = &tcp_adv_win_scale_min,
1181                 .extra2         = &tcp_adv_win_scale_max,
1182         },
1183         {
1184                 .procname       = "tcp_frto",
1185                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1186                 .maxlen         = sizeof(int),
1187                 .mode           = 0644,
1188                 .proc_handler   = proc_dointvec
1189         },
1190         {
1191                 .procname       = "tcp_no_metrics_save",
1192                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1193                 .maxlen         = sizeof(int),
1194                 .mode           = 0644,
1195                 .proc_handler   = proc_dointvec,
1196         },
1197         {
1198                 .procname       = "tcp_no_ssthresh_metrics_save",
1199                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1200                 .maxlen         = sizeof(int),
1201                 .mode           = 0644,
1202                 .proc_handler   = proc_dointvec_minmax,
1203                 .extra1         = SYSCTL_ZERO,
1204                 .extra2         = SYSCTL_ONE,
1205         },
1206         {
1207                 .procname       = "tcp_moderate_rcvbuf",
1208                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1209                 .maxlen         = sizeof(int),
1210                 .mode           = 0644,
1211                 .proc_handler   = proc_dointvec,
1212         },
1213         {
1214                 .procname       = "tcp_tso_win_divisor",
1215                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1216                 .maxlen         = sizeof(int),
1217                 .mode           = 0644,
1218                 .proc_handler   = proc_dointvec,
1219         },
1220         {
1221                 .procname       = "tcp_workaround_signed_windows",
1222                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1223                 .maxlen         = sizeof(int),
1224                 .mode           = 0644,
1225                 .proc_handler   = proc_dointvec
1226         },
1227         {
1228                 .procname       = "tcp_limit_output_bytes",
1229                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1230                 .maxlen         = sizeof(int),
1231                 .mode           = 0644,
1232                 .proc_handler   = proc_dointvec
1233         },
1234         {
1235                 .procname       = "tcp_challenge_ack_limit",
1236                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1237                 .maxlen         = sizeof(int),
1238                 .mode           = 0644,
1239                 .proc_handler   = proc_dointvec
1240         },
1241         {
1242                 .procname       = "tcp_min_tso_segs",
1243                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1244                 .maxlen         = sizeof(int),
1245                 .mode           = 0644,
1246                 .proc_handler   = proc_dointvec_minmax,
1247                 .extra1         = SYSCTL_ONE,
1248                 .extra2         = &gso_max_segs,
1249         },
1250         {
1251                 .procname       = "tcp_min_rtt_wlen",
1252                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1253                 .maxlen         = sizeof(int),
1254                 .mode           = 0644,
1255                 .proc_handler   = proc_dointvec_minmax,
1256                 .extra1         = SYSCTL_ZERO,
1257                 .extra2         = &one_day_secs
1258         },
1259         {
1260                 .procname       = "tcp_autocorking",
1261                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1262                 .maxlen         = sizeof(int),
1263                 .mode           = 0644,
1264                 .proc_handler   = proc_dointvec_minmax,
1265                 .extra1         = SYSCTL_ZERO,
1266                 .extra2         = SYSCTL_ONE,
1267         },
1268         {
1269                 .procname       = "tcp_invalid_ratelimit",
1270                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1271                 .maxlen         = sizeof(int),
1272                 .mode           = 0644,
1273                 .proc_handler   = proc_dointvec_ms_jiffies,
1274         },
1275         {
1276                 .procname       = "tcp_pacing_ss_ratio",
1277                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1278                 .maxlen         = sizeof(int),
1279                 .mode           = 0644,
1280                 .proc_handler   = proc_dointvec_minmax,
1281                 .extra1         = SYSCTL_ZERO,
1282                 .extra2         = &thousand,
1283         },
1284         {
1285                 .procname       = "tcp_pacing_ca_ratio",
1286                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1287                 .maxlen         = sizeof(int),
1288                 .mode           = 0644,
1289                 .proc_handler   = proc_dointvec_minmax,
1290                 .extra1         = SYSCTL_ZERO,
1291                 .extra2         = &thousand,
1292         },
1293         {
1294                 .procname       = "tcp_wmem",
1295                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1296                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1297                 .mode           = 0644,
1298                 .proc_handler   = proc_dointvec_minmax,
1299                 .extra1         = SYSCTL_ONE,
1300         },
1301         {
1302                 .procname       = "tcp_rmem",
1303                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1304                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1305                 .mode           = 0644,
1306                 .proc_handler   = proc_dointvec_minmax,
1307                 .extra1         = SYSCTL_ONE,
1308         },
1309         {
1310                 .procname       = "tcp_comp_sack_delay_ns",
1311                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1312                 .maxlen         = sizeof(unsigned long),
1313                 .mode           = 0644,
1314                 .proc_handler   = proc_doulongvec_minmax,
1315         },
1316         {
1317                 .procname       = "tcp_comp_sack_slack_ns",
1318                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1319                 .maxlen         = sizeof(unsigned long),
1320                 .mode           = 0644,
1321                 .proc_handler   = proc_doulongvec_minmax,
1322         },
1323         {
1324                 .procname       = "tcp_comp_sack_nr",
1325                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1326                 .maxlen         = sizeof(int),
1327                 .mode           = 0644,
1328                 .proc_handler   = proc_dointvec_minmax,
1329                 .extra1         = SYSCTL_ZERO,
1330                 .extra2         = &comp_sack_nr_max,
1331         },
1332         {
1333                 .procname       = "tcp_reflect_tos",
1334                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1335                 .maxlen         = sizeof(int),
1336                 .mode           = 0644,
1337                 .proc_handler   = proc_dointvec_minmax,
1338                 .extra1         = SYSCTL_ZERO,
1339                 .extra2         = SYSCTL_ONE,
1340         },
1341         {
1342                 .procname       = "udp_rmem_min",
1343                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1344                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1345                 .mode           = 0644,
1346                 .proc_handler   = proc_dointvec_minmax,
1347                 .extra1         = SYSCTL_ONE
1348         },
1349         {
1350                 .procname       = "udp_wmem_min",
1351                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1352                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1353                 .mode           = 0644,
1354                 .proc_handler   = proc_dointvec_minmax,
1355                 .extra1         = SYSCTL_ONE
1356         },
1357         {
1358                 .procname       = "fib_notify_on_flag_change",
1359                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1360                 .maxlen         = sizeof(int),
1361                 .mode           = 0644,
1362                 .proc_handler   = proc_dointvec_minmax,
1363                 .extra1         = SYSCTL_ZERO,
1364                 .extra2         = &two,
1365         },
1366         { }
1367 };
1368
1369 static __net_init int ipv4_sysctl_init_net(struct net *net)
1370 {
1371         struct ctl_table *table;
1372
1373         table = ipv4_net_table;
1374         if (!net_eq(net, &init_net)) {
1375                 int i;
1376
1377                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1378                 if (!table)
1379                         goto err_alloc;
1380
1381                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1382                         if (table[i].data) {
1383                                 /* Update the variables to point into
1384                                  * the current struct net
1385                                  */
1386                                 table[i].data += (void *)net - (void *)&init_net;
1387                         } else {
1388                                 /* Entries without data pointer are global;
1389                                  * Make them read-only in non-init_net ns
1390                                  */
1391                                 table[i].mode &= ~0222;
1392                         }
1393                 }
1394         }
1395
1396         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1397         if (!net->ipv4.ipv4_hdr)
1398                 goto err_reg;
1399
1400         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1401         if (!net->ipv4.sysctl_local_reserved_ports)
1402                 goto err_ports;
1403
1404         return 0;
1405
1406 err_ports:
1407         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1408 err_reg:
1409         if (!net_eq(net, &init_net))
1410                 kfree(table);
1411 err_alloc:
1412         return -ENOMEM;
1413 }
1414
1415 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1416 {
1417         struct ctl_table *table;
1418
1419         kfree(net->ipv4.sysctl_local_reserved_ports);
1420         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1421         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1422         kfree(table);
1423 }
1424
1425 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1426         .init = ipv4_sysctl_init_net,
1427         .exit = ipv4_sysctl_exit_net,
1428 };
1429
1430 static __init int sysctl_ipv4_init(void)
1431 {
1432         struct ctl_table_header *hdr;
1433
1434         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1435         if (!hdr)
1436                 return -ENOMEM;
1437
1438         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1439                 unregister_net_sysctl_table(hdr);
1440                 return -ENOMEM;
1441         }
1442
1443         return 0;
1444 }
1445
1446 __initcall(sysctl_ipv4_init);