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         struct tcp_fastopen_context *ctx;
 305         u32 user_key[TCP_FASTOPEN_KEY_MAX * 4];
 306         __le32 key[TCP_FASTOPEN_KEY_MAX * 4];
 307         char *backup_data;
 308         int ret, i = 0, off = 0, n_keys = 0;
 309
 310         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 311         if (!tbl.data)
 312                 return -ENOMEM;
 313
 314         rcu_read_lock();
 315         ctx = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 316         if (ctx) {
 317                 n_keys = tcp_fastopen_context_len(ctx);
 318                 memcpy(&key[0], &ctx->key[0], TCP_FASTOPEN_KEY_LENGTH * n_keys);
 319         }
 320         rcu_read_unlock();
 321
 322         if (!n_keys) {
 323                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 324                 n_keys = 1;
 325         }
 326
 327         for (i = 0; i < n_keys * 4; i++)
 328                 user_key[i] = le32_to_cpu(key[i]);
 329
 330         for (i = 0; i < n_keys; i++) {
 331                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 332                                 "%08x-%08x-%08x-%08x",
 333                                 user_key[i * 4],
 334                                 user_key[i * 4 + 1],
 335                                 user_key[i * 4 + 2],
 336                                 user_key[i * 4 + 3]);
 337
 338                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 339                         break;
 340
 341                 if (i + 1 < n_keys)
 342                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 343         }
 344
 345         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 346
 347         if (write && ret == 0) {
 348                 backup_data = strchr(tbl.data, ',');
 349                 if (backup_data) {
 350                         *backup_data = '\0';
 351                         backup_data++;
 352                 }
 353                 if (sscanf_key(tbl.data, key)) {
 354                         ret = -EINVAL;
 355                         goto bad_key;
 356                 }
 357                 if (backup_data) {
 358                         if (sscanf_key(backup_data, key + 4)) {
 359                                 ret = -EINVAL;
 360                                 goto bad_key;
 361                         }
 362                 }
 363                 tcp_fastopen_reset_cipher(net, NULL, key,
 364                                           backup_data ? key + 4 : NULL);
 365         }
 366
 367 bad_key:
 368         kfree(tbl.data);
 369         return ret;
 370 }
 371
 372 static void proc_configure_early_demux(int enabled, int protocol)
 373 {
 374         struct net_protocol *ipprot;
 375 #if IS_ENABLED(CONFIG_IPV6)
 376         struct inet6_protocol *ip6prot;
 377 #endif
 378
 379         rcu_read_lock();
 380
 381         ipprot = rcu_dereference(inet_protos[protocol]);
 382         if (ipprot)
 383                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 384                                                 NULL;
 385
 386 #if IS_ENABLED(CONFIG_IPV6)
 387         ip6prot = rcu_dereference(inet6_protos[protocol]);
 388         if (ip6prot)
 389                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 390                                                  NULL;
 391 #endif
 392         rcu_read_unlock();
 393 }
 394
 395 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 396                                 void *buffer, size_t *lenp, loff_t *ppos)
 397 {
 398         int ret = 0;
 399
 400         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 401
 402         if (write && !ret) {
 403                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 404
 405                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 406         }
 407
 408         return ret;
 409 }
 410
 411 static int proc_udp_early_demux(struct ctl_table *table, int write,
 412                                 void *buffer, size_t *lenp, loff_t *ppos)
 413 {
 414         int ret = 0;
 415
 416         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 417
 418         if (write && !ret) {
 419                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 420
 421                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 422         }
 423
 424         return ret;
 425 }
 426
 427 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 428                                              int write, void *buffer,
 429                                              size_t *lenp, loff_t *ppos)
 430 {
 431         struct net *net = container_of(table->data, struct net,
 432             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 433         int ret;
 434
 435         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 436         if (write && ret == 0)
 437                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 438
 439         return ret;
 440 }
 441
 442 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 443                                   int write, void *buffer, size_t *lenp,
 444                                   loff_t *ppos)
 445 {
 446         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 447         int ret;
 448
 449         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 450         if (!tbl.data)
 451                 return -ENOMEM;
 452         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 453         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 454         kfree(tbl.data);
 455
 456         return ret;
 457 }
 458
 459 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 460 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 461                                           void *buffer, size_t *lenp,
 462                                           loff_t *ppos)
 463 {
 464         struct net *net = container_of(table->data, struct net,
 465             ipv4.sysctl_fib_multipath_hash_policy);
 466         int ret;
 467
 468         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 469         if (write && ret == 0)
 470                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 471
 472         return ret;
 473 }
 474 #endif
 475
 476 static struct ctl_table ipv4_table[] = {
 477         {
 478                 .procname       = "tcp_max_orphans",
 479                 .data           = &sysctl_tcp_max_orphans,
 480                 .maxlen         = sizeof(int),
 481                 .mode           = 0644,
 482                 .proc_handler   = proc_dointvec
 483         },
 484         {
 485                 .procname       = "inet_peer_threshold",
 486                 .data           = &inet_peer_threshold,
 487                 .maxlen         = sizeof(int),
 488                 .mode           = 0644,
 489                 .proc_handler   = proc_dointvec
 490         },
 491         {
 492                 .procname       = "inet_peer_minttl",
 493                 .data           = &inet_peer_minttl,
 494                 .maxlen         = sizeof(int),
 495                 .mode           = 0644,
 496                 .proc_handler   = proc_dointvec_jiffies,
 497         },
 498         {
 499                 .procname       = "inet_peer_maxttl",
 500                 .data           = &inet_peer_maxttl,
 501                 .maxlen         = sizeof(int),
 502                 .mode           = 0644,
 503                 .proc_handler   = proc_dointvec_jiffies,
 504         },
 505         {
 506                 .procname       = "tcp_mem",
 507                 .maxlen         = sizeof(sysctl_tcp_mem),
 508                 .data           = &sysctl_tcp_mem,
 509                 .mode           = 0644,
 510                 .proc_handler   = proc_doulongvec_minmax,
 511         },
 512         {
 513                 .procname       = "tcp_low_latency",
 514                 .data           = &sysctl_tcp_low_latency,
 515                 .maxlen         = sizeof(int),
 516                 .mode           = 0644,
 517                 .proc_handler   = proc_dointvec
 518         },
 519 #ifdef CONFIG_NETLABEL
 520         {
 521                 .procname       = "cipso_cache_enable",
 522                 .data           = &cipso_v4_cache_enabled,
 523                 .maxlen         = sizeof(int),
 524                 .mode           = 0644,
 525                 .proc_handler   = proc_dointvec,
 526         },
 527         {
 528                 .procname       = "cipso_cache_bucket_size",
 529                 .data           = &cipso_v4_cache_bucketsize,
 530                 .maxlen         = sizeof(int),
 531                 .mode           = 0644,
 532                 .proc_handler   = proc_dointvec,
 533         },
 534         {
 535                 .procname       = "cipso_rbm_optfmt",
 536                 .data           = &cipso_v4_rbm_optfmt,
 537                 .maxlen         = sizeof(int),
 538                 .mode           = 0644,
 539                 .proc_handler   = proc_dointvec,
 540         },
 541         {
 542                 .procname       = "cipso_rbm_strictvalid",
 543                 .data           = &cipso_v4_rbm_strictvalid,
 544                 .maxlen         = sizeof(int),
 545                 .mode           = 0644,
 546                 .proc_handler   = proc_dointvec,
 547         },
 548 #endif /* CONFIG_NETLABEL */
 549         {
 550                 .procname       = "tcp_available_ulp",
 551                 .maxlen         = TCP_ULP_BUF_MAX,
 552                 .mode           = 0444,
 553                 .proc_handler   = proc_tcp_available_ulp,
 554         },
 555         {
 556                 .procname       = "icmp_msgs_per_sec",
 557                 .data           = &sysctl_icmp_msgs_per_sec,
 558                 .maxlen         = sizeof(int),
 559                 .mode           = 0644,
 560                 .proc_handler   = proc_dointvec_minmax,
 561                 .extra1         = SYSCTL_ZERO,
 562         },
 563         {
 564                 .procname       = "icmp_msgs_burst",
 565                 .data           = &sysctl_icmp_msgs_burst,
 566                 .maxlen         = sizeof(int),
 567                 .mode           = 0644,
 568                 .proc_handler   = proc_dointvec_minmax,
 569                 .extra1         = SYSCTL_ZERO,
 570         },
 571         {
 572                 .procname       = "udp_mem",
 573                 .data           = &sysctl_udp_mem,
 574                 .maxlen         = sizeof(sysctl_udp_mem),
 575                 .mode           = 0644,
 576                 .proc_handler   = proc_doulongvec_minmax,
 577         },
 578         {
 579                 .procname       = "fib_sync_mem",
 580                 .data           = &sysctl_fib_sync_mem,
 581                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 582                 .mode           = 0644,
 583                 .proc_handler   = proc_douintvec_minmax,
 584                 .extra1         = &sysctl_fib_sync_mem_min,
 585                 .extra2         = &sysctl_fib_sync_mem_max,
 586         },
 587         {
 588                 .procname       = "tcp_rx_skb_cache",
 589                 .data           = &tcp_rx_skb_cache_key.key,
 590                 .mode           = 0644,
 591                 .proc_handler   = proc_do_static_key,
 592         },
 593         {
 594                 .procname       = "tcp_tx_skb_cache",
 595                 .data           = &tcp_tx_skb_cache_key.key,
 596                 .mode           = 0644,
 597                 .proc_handler   = proc_do_static_key,
 598         },
 599         { }
 600 };
 601
 602 static struct ctl_table ipv4_net_table[] = {
 603         {
 604                 .procname       = "icmp_echo_ignore_all",
 605                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 606                 .maxlen         = sizeof(int),
 607                 .mode           = 0644,
 608                 .proc_handler   = proc_dointvec
 609         },
 610         {
 611                 .procname       = "icmp_echo_ignore_broadcasts",
 612                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 613                 .maxlen         = sizeof(int),
 614                 .mode           = 0644,
 615                 .proc_handler   = proc_dointvec
 616         },
 617         {
 618                 .procname       = "icmp_ignore_bogus_error_responses",
 619                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 620                 .maxlen         = sizeof(int),
 621                 .mode           = 0644,
 622                 .proc_handler   = proc_dointvec
 623         },
 624         {
 625                 .procname       = "icmp_errors_use_inbound_ifaddr",
 626                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 627                 .maxlen         = sizeof(int),
 628                 .mode           = 0644,
 629                 .proc_handler   = proc_dointvec
 630         },
 631         {
 632                 .procname       = "icmp_ratelimit",
 633                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 634                 .maxlen         = sizeof(int),
 635                 .mode           = 0644,
 636                 .proc_handler   = proc_dointvec_ms_jiffies,
 637         },
 638         {
 639                 .procname       = "icmp_ratemask",
 640                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 641                 .maxlen         = sizeof(int),
 642                 .mode           = 0644,
 643                 .proc_handler   = proc_dointvec
 644         },
 645         {
 646                 .procname       = "ping_group_range",
 647                 .data           = &init_net.ipv4.ping_group_range.range,
 648                 .maxlen         = sizeof(gid_t)*2,
 649                 .mode           = 0644,
 650                 .proc_handler   = ipv4_ping_group_range,
 651         },
 652 #ifdef CONFIG_NET_L3_MASTER_DEV
 653         {
 654                 .procname       = "raw_l3mdev_accept",
 655                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 656                 .maxlen         = sizeof(int),
 657                 .mode           = 0644,
 658                 .proc_handler   = proc_dointvec_minmax,
 659                 .extra1         = SYSCTL_ZERO,
 660                 .extra2         = SYSCTL_ONE,
 661         },
 662 #endif
 663         {
 664                 .procname       = "tcp_ecn",
 665                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 666                 .maxlen         = sizeof(int),
 667                 .mode           = 0644,
 668                 .proc_handler   = proc_dointvec
 669         },
 670         {
 671                 .procname       = "tcp_ecn_fallback",
 672                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 673                 .maxlen         = sizeof(int),
 674                 .mode           = 0644,
 675                 .proc_handler   = proc_dointvec
 676         },
 677         {
 678                 .procname       = "ip_dynaddr",
 679                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 680                 .maxlen         = sizeof(int),
 681                 .mode           = 0644,
 682                 .proc_handler   = proc_dointvec
 683         },
 684         {
 685                 .procname       = "ip_early_demux",
 686                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 687                 .maxlen         = sizeof(int),
 688                 .mode           = 0644,
 689                 .proc_handler   = proc_dointvec
 690         },
 691         {
 692                 .procname       = "udp_early_demux",
 693                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 694                 .maxlen         = sizeof(int),
 695                 .mode           = 0644,
 696                 .proc_handler   = proc_udp_early_demux
 697         },
 698         {
 699                 .procname       = "tcp_early_demux",
 700                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 701                 .maxlen         = sizeof(int),
 702                 .mode           = 0644,
 703                 .proc_handler   = proc_tcp_early_demux
 704         },
 705         {
 706                 .procname       = "nexthop_compat_mode",
 707                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 708                 .maxlen         = sizeof(int),
 709                 .mode           = 0644,
 710                 .proc_handler   = proc_dointvec_minmax,
 711                 .extra1         = SYSCTL_ZERO,
 712                 .extra2         = SYSCTL_ONE,
 713         },
 714         {
 715                 .procname       = "ip_default_ttl",
 716                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 717                 .maxlen         = sizeof(int),
 718                 .mode           = 0644,
 719                 .proc_handler   = proc_dointvec_minmax,
 720                 .extra1         = &ip_ttl_min,
 721                 .extra2         = &ip_ttl_max,
 722         },
 723         {
 724                 .procname       = "ip_local_port_range",
 725                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 726                 .data           = &init_net.ipv4.ip_local_ports.range,
 727                 .mode           = 0644,
 728                 .proc_handler   = ipv4_local_port_range,
 729         },
 730         {
 731                 .procname       = "ip_local_reserved_ports",
 732                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 733                 .maxlen         = 65536,
 734                 .mode           = 0644,
 735                 .proc_handler   = proc_do_large_bitmap,
 736         },
 737         {
 738                 .procname       = "ip_no_pmtu_disc",
 739                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 740                 .maxlen         = sizeof(int),
 741                 .mode           = 0644,
 742                 .proc_handler   = proc_dointvec
 743         },
 744         {
 745                 .procname       = "ip_forward_use_pmtu",
 746                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 747                 .maxlen         = sizeof(int),
 748                 .mode           = 0644,
 749                 .proc_handler   = proc_dointvec,
 750         },
 751         {
 752                 .procname       = "ip_forward_update_priority",
 753                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 754                 .maxlen         = sizeof(int),
 755                 .mode           = 0644,
 756                 .proc_handler   = ipv4_fwd_update_priority,
 757                 .extra1         = SYSCTL_ZERO,
 758                 .extra2         = SYSCTL_ONE,
 759         },
 760         {
 761                 .procname       = "ip_nonlocal_bind",
 762                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 763                 .maxlen         = sizeof(int),
 764                 .mode           = 0644,
 765                 .proc_handler   = proc_dointvec
 766         },
 767         {
 768                 .procname       = "ip_autobind_reuse",
 769                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 770                 .maxlen         = sizeof(int),
 771                 .mode           = 0644,
 772                 .proc_handler   = proc_dointvec_minmax,
 773                 .extra1         = SYSCTL_ZERO,
 774                 .extra2         = SYSCTL_ONE,
 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         = SYSCTL_ZERO,
 798                 .extra2         = SYSCTL_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_mtu_probe_floor",
 826                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = proc_dointvec_minmax,
 830                 .extra1         = &tcp_min_snd_mss_min,
 831                 .extra2         = &tcp_min_snd_mss_max,
 832         },
 833         {
 834                 .procname       = "tcp_probe_threshold",
 835                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 836                 .maxlen         = sizeof(int),
 837                 .mode           = 0644,
 838                 .proc_handler   = proc_dointvec,
 839         },
 840         {
 841                 .procname       = "tcp_probe_interval",
 842                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 843                 .maxlen         = sizeof(u32),
 844                 .mode           = 0644,
 845                 .proc_handler   = proc_douintvec_minmax,
 846                 .extra2         = &u32_max_div_HZ,
 847         },
 848         {
 849                 .procname       = "igmp_link_local_mcast_reports",
 850                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 851                 .maxlen         = sizeof(int),
 852                 .mode           = 0644,
 853                 .proc_handler   = proc_dointvec
 854         },
 855         {
 856                 .procname       = "igmp_max_memberships",
 857                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 858                 .maxlen         = sizeof(int),
 859                 .mode           = 0644,
 860                 .proc_handler   = proc_dointvec
 861         },
 862         {
 863                 .procname       = "igmp_max_msf",
 864                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 865                 .maxlen         = sizeof(int),
 866                 .mode           = 0644,
 867                 .proc_handler   = proc_dointvec
 868         },
 869 #ifdef CONFIG_IP_MULTICAST
 870         {
 871                 .procname       = "igmp_qrv",
 872                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 873                 .maxlen         = sizeof(int),
 874                 .mode           = 0644,
 875                 .proc_handler   = proc_dointvec_minmax,
 876                 .extra1         = SYSCTL_ONE
 877         },
 878 #endif
 879         {
 880                 .procname       = "tcp_congestion_control",
 881                 .data           = &init_net.ipv4.tcp_congestion_control,
 882                 .mode           = 0644,
 883                 .maxlen         = TCP_CA_NAME_MAX,
 884                 .proc_handler   = proc_tcp_congestion_control,
 885         },
 886         {
 887                 .procname       = "tcp_available_congestion_control",
 888                 .maxlen         = TCP_CA_BUF_MAX,
 889                 .mode           = 0444,
 890                 .proc_handler   = proc_tcp_available_congestion_control,
 891         },
 892         {
 893                 .procname       = "tcp_allowed_congestion_control",
 894                 .maxlen         = TCP_CA_BUF_MAX,
 895                 .mode           = 0644,
 896                 .proc_handler   = proc_allowed_congestion_control,
 897         },
 898         {
 899                 .procname       = "tcp_keepalive_time",
 900                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 901                 .maxlen         = sizeof(int),
 902                 .mode           = 0644,
 903                 .proc_handler   = proc_dointvec_jiffies,
 904         },
 905         {
 906                 .procname       = "tcp_keepalive_probes",
 907                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 908                 .maxlen         = sizeof(int),
 909                 .mode           = 0644,
 910                 .proc_handler   = proc_dointvec
 911         },
 912         {
 913                 .procname       = "tcp_keepalive_intvl",
 914                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 915                 .maxlen         = sizeof(int),
 916                 .mode           = 0644,
 917                 .proc_handler   = proc_dointvec_jiffies,
 918         },
 919         {
 920                 .procname       = "tcp_syn_retries",
 921                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 922                 .maxlen         = sizeof(int),
 923                 .mode           = 0644,
 924                 .proc_handler   = proc_dointvec_minmax,
 925                 .extra1         = &tcp_syn_retries_min,
 926                 .extra2         = &tcp_syn_retries_max
 927         },
 928         {
 929                 .procname       = "tcp_synack_retries",
 930                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 931                 .maxlen         = sizeof(int),
 932                 .mode           = 0644,
 933                 .proc_handler   = proc_dointvec
 934         },
 935 #ifdef CONFIG_SYN_COOKIES
 936         {
 937                 .procname       = "tcp_syncookies",
 938                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 939                 .maxlen         = sizeof(int),
 940                 .mode           = 0644,
 941                 .proc_handler   = proc_dointvec
 942         },
 943 #endif
 944         {
 945                 .procname       = "tcp_reordering",
 946                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 947                 .maxlen         = sizeof(int),
 948                 .mode           = 0644,
 949                 .proc_handler   = proc_dointvec
 950         },
 951         {
 952                 .procname       = "tcp_retries1",
 953                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 954                 .maxlen         = sizeof(int),
 955                 .mode           = 0644,
 956                 .proc_handler   = proc_dointvec_minmax,
 957                 .extra2         = &tcp_retr1_max
 958         },
 959         {
 960                 .procname       = "tcp_retries2",
 961                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 962                 .maxlen         = sizeof(int),
 963                 .mode           = 0644,
 964                 .proc_handler   = proc_dointvec
 965         },
 966         {
 967                 .procname       = "tcp_orphan_retries",
 968                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 969                 .maxlen         = sizeof(int),
 970                 .mode           = 0644,
 971                 .proc_handler   = proc_dointvec
 972         },
 973         {
 974                 .procname       = "tcp_fin_timeout",
 975                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 976                 .maxlen         = sizeof(int),
 977                 .mode           = 0644,
 978                 .proc_handler   = proc_dointvec_jiffies,
 979         },
 980         {
 981                 .procname       = "tcp_notsent_lowat",
 982                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 983                 .maxlen         = sizeof(unsigned int),
 984                 .mode           = 0644,
 985                 .proc_handler   = proc_douintvec,
 986         },
 987         {
 988                 .procname       = "tcp_tw_reuse",
 989                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 990                 .maxlen         = sizeof(int),
 991                 .mode           = 0644,
 992                 .proc_handler   = proc_dointvec_minmax,
 993                 .extra1         = SYSCTL_ZERO,
 994                 .extra2         = &two,
 995         },
 996         {
 997                 .procname       = "tcp_max_tw_buckets",
 998                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 999                 .maxlen         = sizeof(int),
1000                 .mode           = 0644,
1001                 .proc_handler   = proc_dointvec
1002         },
1003         {
1004                 .procname       = "tcp_max_syn_backlog",
1005                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1006                 .maxlen         = sizeof(int),
1007                 .mode           = 0644,
1008                 .proc_handler   = proc_dointvec
1009         },
1010         {
1011                 .procname       = "tcp_fastopen",
1012                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1013                 .maxlen         = sizeof(int),
1014                 .mode           = 0644,
1015                 .proc_handler   = proc_dointvec,
1016         },
1017         {
1018                 .procname       = "tcp_fastopen_key",
1019                 .mode           = 0600,
1020                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1021                 /* maxlen to print the list of keys in hex (*2), with dashes
1022                  * separating doublewords and a comma in between keys.
1023                  */
1024                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1025                                    2 * TCP_FASTOPEN_KEY_MAX) +
1026                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1027                 .proc_handler   = proc_tcp_fastopen_key,
1028         },
1029         {
1030                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1031                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1032                 .maxlen         = sizeof(int),
1033                 .mode           = 0644,
1034                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1035                 .extra1         = SYSCTL_ZERO,
1036         },
1037 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1038         {
1039                 .procname       = "fib_multipath_use_neigh",
1040                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1041                 .maxlen         = sizeof(int),
1042                 .mode           = 0644,
1043                 .proc_handler   = proc_dointvec_minmax,
1044                 .extra1         = SYSCTL_ZERO,
1045                 .extra2         = SYSCTL_ONE,
1046         },
1047         {
1048                 .procname       = "fib_multipath_hash_policy",
1049                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1050                 .maxlen         = sizeof(int),
1051                 .mode           = 0644,
1052                 .proc_handler   = proc_fib_multipath_hash_policy,
1053                 .extra1         = SYSCTL_ZERO,
1054                 .extra2         = &two,
1055         },
1056 #endif
1057         {
1058                 .procname       = "ip_unprivileged_port_start",
1059                 .maxlen         = sizeof(int),
1060                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1061                 .mode           = 0644,
1062                 .proc_handler   = ipv4_privileged_ports,
1063         },
1064 #ifdef CONFIG_NET_L3_MASTER_DEV
1065         {
1066                 .procname       = "udp_l3mdev_accept",
1067                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1068                 .maxlen         = sizeof(int),
1069                 .mode           = 0644,
1070                 .proc_handler   = proc_dointvec_minmax,
1071                 .extra1         = SYSCTL_ZERO,
1072                 .extra2         = SYSCTL_ONE,
1073         },
1074 #endif
1075         {
1076                 .procname       = "tcp_sack",
1077                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1078                 .maxlen         = sizeof(int),
1079                 .mode           = 0644,
1080                 .proc_handler   = proc_dointvec
1081         },
1082         {
1083                 .procname       = "tcp_window_scaling",
1084                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1085                 .maxlen         = sizeof(int),
1086                 .mode           = 0644,
1087                 .proc_handler   = proc_dointvec
1088         },
1089         {
1090                 .procname       = "tcp_timestamps",
1091                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1092                 .maxlen         = sizeof(int),
1093                 .mode           = 0644,
1094                 .proc_handler   = proc_dointvec
1095         },
1096         {
1097                 .procname       = "tcp_early_retrans",
1098                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1099                 .maxlen         = sizeof(int),
1100                 .mode           = 0644,
1101                 .proc_handler   = proc_dointvec_minmax,
1102                 .extra1         = SYSCTL_ZERO,
1103                 .extra2         = &four,
1104         },
1105         {
1106                 .procname       = "tcp_recovery",
1107                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1108                 .maxlen         = sizeof(int),
1109                 .mode           = 0644,
1110                 .proc_handler   = proc_dointvec,
1111         },
1112         {
1113                 .procname       = "tcp_thin_linear_timeouts",
1114                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1115                 .maxlen         = sizeof(int),
1116                 .mode           = 0644,
1117                 .proc_handler   = proc_dointvec
1118         },
1119         {
1120                 .procname       = "tcp_slow_start_after_idle",
1121                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1122                 .maxlen         = sizeof(int),
1123                 .mode           = 0644,
1124                 .proc_handler   = proc_dointvec
1125         },
1126         {
1127                 .procname       = "tcp_retrans_collapse",
1128                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1129                 .maxlen         = sizeof(int),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dointvec
1132         },
1133         {
1134                 .procname       = "tcp_stdurg",
1135                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1136                 .maxlen         = sizeof(int),
1137                 .mode           = 0644,
1138                 .proc_handler   = proc_dointvec
1139         },
1140         {
1141                 .procname       = "tcp_rfc1337",
1142                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1143                 .maxlen         = sizeof(int),
1144                 .mode           = 0644,
1145                 .proc_handler   = proc_dointvec
1146         },
1147         {
1148                 .procname       = "tcp_abort_on_overflow",
1149                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1150                 .maxlen         = sizeof(int),
1151                 .mode           = 0644,
1152                 .proc_handler   = proc_dointvec
1153         },
1154         {
1155                 .procname       = "tcp_fack",
1156                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1157                 .maxlen         = sizeof(int),
1158                 .mode           = 0644,
1159                 .proc_handler   = proc_dointvec
1160         },
1161         {
1162                 .procname       = "tcp_max_reordering",
1163                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1164                 .maxlen         = sizeof(int),
1165                 .mode           = 0644,
1166                 .proc_handler   = proc_dointvec
1167         },
1168         {
1169                 .procname       = "tcp_dsack",
1170                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1171                 .maxlen         = sizeof(int),
1172                 .mode           = 0644,
1173                 .proc_handler   = proc_dointvec
1174         },
1175         {
1176                 .procname       = "tcp_app_win",
1177                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1178                 .maxlen         = sizeof(int),
1179                 .mode           = 0644,
1180                 .proc_handler   = proc_dointvec
1181         },
1182         {
1183                 .procname       = "tcp_adv_win_scale",
1184                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1185                 .maxlen         = sizeof(int),
1186                 .mode           = 0644,
1187                 .proc_handler   = proc_dointvec_minmax,
1188                 .extra1         = &tcp_adv_win_scale_min,
1189                 .extra2         = &tcp_adv_win_scale_max,
1190         },
1191         {
1192                 .procname       = "tcp_frto",
1193                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1194                 .maxlen         = sizeof(int),
1195                 .mode           = 0644,
1196                 .proc_handler   = proc_dointvec
1197         },
1198         {
1199                 .procname       = "tcp_no_metrics_save",
1200                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1201                 .maxlen         = sizeof(int),
1202                 .mode           = 0644,
1203                 .proc_handler   = proc_dointvec,
1204         },
1205         {
1206                 .procname       = "tcp_no_ssthresh_metrics_save",
1207                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1208                 .maxlen         = sizeof(int),
1209                 .mode           = 0644,
1210                 .proc_handler   = proc_dointvec_minmax,
1211                 .extra1         = SYSCTL_ZERO,
1212                 .extra2         = SYSCTL_ONE,
1213         },
1214         {
1215                 .procname       = "tcp_moderate_rcvbuf",
1216                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1217                 .maxlen         = sizeof(int),
1218                 .mode           = 0644,
1219                 .proc_handler   = proc_dointvec,
1220         },
1221         {
1222                 .procname       = "tcp_tso_win_divisor",
1223                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1224                 .maxlen         = sizeof(int),
1225                 .mode           = 0644,
1226                 .proc_handler   = proc_dointvec,
1227         },
1228         {
1229                 .procname       = "tcp_workaround_signed_windows",
1230                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1231                 .maxlen         = sizeof(int),
1232                 .mode           = 0644,
1233                 .proc_handler   = proc_dointvec
1234         },
1235         {
1236                 .procname       = "tcp_limit_output_bytes",
1237                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1238                 .maxlen         = sizeof(int),
1239                 .mode           = 0644,
1240                 .proc_handler   = proc_dointvec
1241         },
1242         {
1243                 .procname       = "tcp_challenge_ack_limit",
1244                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1245                 .maxlen         = sizeof(int),
1246                 .mode           = 0644,
1247                 .proc_handler   = proc_dointvec
1248         },
1249         {
1250                 .procname       = "tcp_min_tso_segs",
1251                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1252                 .maxlen         = sizeof(int),
1253                 .mode           = 0644,
1254                 .proc_handler   = proc_dointvec_minmax,
1255                 .extra1         = SYSCTL_ONE,
1256                 .extra2         = &gso_max_segs,
1257         },
1258         {
1259                 .procname       = "tcp_min_rtt_wlen",
1260                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1261                 .maxlen         = sizeof(int),
1262                 .mode           = 0644,
1263                 .proc_handler   = proc_dointvec_minmax,
1264                 .extra1         = SYSCTL_ZERO,
1265                 .extra2         = &one_day_secs
1266         },
1267         {
1268                 .procname       = "tcp_autocorking",
1269                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1270                 .maxlen         = sizeof(int),
1271                 .mode           = 0644,
1272                 .proc_handler   = proc_dointvec_minmax,
1273                 .extra1         = SYSCTL_ZERO,
1274                 .extra2         = SYSCTL_ONE,
1275         },
1276         {
1277                 .procname       = "tcp_invalid_ratelimit",
1278                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1279                 .maxlen         = sizeof(int),
1280                 .mode           = 0644,
1281                 .proc_handler   = proc_dointvec_ms_jiffies,
1282         },
1283         {
1284                 .procname       = "tcp_pacing_ss_ratio",
1285                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1286                 .maxlen         = sizeof(int),
1287                 .mode           = 0644,
1288                 .proc_handler   = proc_dointvec_minmax,
1289                 .extra1         = SYSCTL_ZERO,
1290                 .extra2         = &thousand,
1291         },
1292         {
1293                 .procname       = "tcp_pacing_ca_ratio",
1294                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1295                 .maxlen         = sizeof(int),
1296                 .mode           = 0644,
1297                 .proc_handler   = proc_dointvec_minmax,
1298                 .extra1         = SYSCTL_ZERO,
1299                 .extra2         = &thousand,
1300         },
1301         {
1302                 .procname       = "tcp_wmem",
1303                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1304                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1305                 .mode           = 0644,
1306                 .proc_handler   = proc_dointvec_minmax,
1307                 .extra1         = SYSCTL_ONE,
1308         },
1309         {
1310                 .procname       = "tcp_rmem",
1311                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1312                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1313                 .mode           = 0644,
1314                 .proc_handler   = proc_dointvec_minmax,
1315                 .extra1         = SYSCTL_ONE,
1316         },
1317         {
1318                 .procname       = "tcp_comp_sack_delay_ns",
1319                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1320                 .maxlen         = sizeof(unsigned long),
1321                 .mode           = 0644,
1322                 .proc_handler   = proc_doulongvec_minmax,
1323         },
1324         {
1325                 .procname       = "tcp_comp_sack_slack_ns",
1326                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1327                 .maxlen         = sizeof(unsigned long),
1328                 .mode           = 0644,
1329                 .proc_handler   = proc_doulongvec_minmax,
1330         },
1331         {
1332                 .procname       = "tcp_comp_sack_nr",
1333                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1334                 .maxlen         = sizeof(int),
1335                 .mode           = 0644,
1336                 .proc_handler   = proc_dointvec_minmax,
1337                 .extra1         = SYSCTL_ZERO,
1338                 .extra2         = &comp_sack_nr_max,
1339         },
1340         {
1341                 .procname       = "udp_rmem_min",
1342                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1343                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1344                 .mode           = 0644,
1345                 .proc_handler   = proc_dointvec_minmax,
1346                 .extra1         = SYSCTL_ONE
1347         },
1348         {
1349                 .procname       = "udp_wmem_min",
1350                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1351                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1352                 .mode           = 0644,
1353                 .proc_handler   = proc_dointvec_minmax,
1354                 .extra1         = SYSCTL_ONE
1355         },
1356         { }
1357 };
1358
1359 static __net_init int ipv4_sysctl_init_net(struct net *net)
1360 {
1361         struct ctl_table *table;
1362
1363         table = ipv4_net_table;
1364         if (!net_eq(net, &init_net)) {
1365                 int i;
1366
1367                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1368                 if (!table)
1369                         goto err_alloc;
1370
1371                 /* Update the variables to point into the current struct net */
1372                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1373                         table[i].data += (void *)net - (void *)&init_net;
1374         }
1375
1376         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1377         if (!net->ipv4.ipv4_hdr)
1378                 goto err_reg;
1379
1380         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1381         if (!net->ipv4.sysctl_local_reserved_ports)
1382                 goto err_ports;
1383
1384         return 0;
1385
1386 err_ports:
1387         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1388 err_reg:
1389         if (!net_eq(net, &init_net))
1390                 kfree(table);
1391 err_alloc:
1392         return -ENOMEM;
1393 }
1394
1395 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1396 {
1397         struct ctl_table *table;
1398
1399         kfree(net->ipv4.sysctl_local_reserved_ports);
1400         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1401         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1402         kfree(table);
1403 }
1404
1405 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1406         .init = ipv4_sysctl_init_net,
1407         .exit = ipv4_sysctl_exit_net,
1408 };
1409
1410 static __init int sysctl_ipv4_init(void)
1411 {
1412         struct ctl_table_header *hdr;
1413
1414         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1415         if (!hdr)
1416                 return -ENOMEM;
1417
1418         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1419                 unregister_net_sysctl_table(hdr);
1420                 return -ENOMEM;
1421         }
1422
1423         return 0;
1424 }
1425
1426 __initcall(sysctl_ipv4_init);