net/ipv4/sysctl_net_ipv4.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   4  *
   5  * Begun April 1, 1996, Mike Shaver.
   6  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   7  */
   8
   9 #include <linux/mm.h>
  10 #include <linux/module.h>
  11 #include <linux/sysctl.h>
  12 #include <linux/igmp.h>
  13 #include <linux/inetdevice.h>
  14 #include <linux/seqlock.h>
  15 #include <linux/init.h>
  16 #include <linux/slab.h>
  17 #include <linux/nsproxy.h>
  18 #include <linux/swap.h>
  19 #include <net/snmp.h>
  20 #include <net/icmp.h>
  21 #include <net/ip.h>
  22 #include <net/route.h>
  23 #include <net/tcp.h>
  24 #include <net/udp.h>
  25 #include <net/cipso_ipv4.h>
  26 #include <net/inet_frag.h>
  27 #include <net/ping.h>
  28 #include <net/protocol.h>
  29 #include <net/netevent.h>
  30
  31 static int two = 2;
  32 static int four = 4;
  33 static int thousand = 1000;
  34 static int gso_max_segs = GSO_MAX_SEGS;
  35 static int tcp_retr1_max = 255;
  36 static int ip_local_port_range_min[] = { 1, 1 };
  37 static int ip_local_port_range_max[] = { 65535, 65535 };
  38 static int tcp_adv_win_scale_min = -31;
  39 static int tcp_adv_win_scale_max = 31;
  40 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  41 static int tcp_min_snd_mss_max = 65535;
  42 static int ip_privileged_port_min;
  43 static int ip_privileged_port_max = 65535;
  44 static int ip_ttl_min = 1;
  45 static int ip_ttl_max = 255;
  46 static int tcp_syn_retries_min = 1;
  47 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  48 static int ip_ping_group_range_min[] = { 0, 0 };
  49 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  50 static int comp_sack_nr_max = 255;
  51 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  52 static int one_day_secs = 24 * 3600;
  53
  54 /* obsolete */
  55 static int sysctl_tcp_low_latency __read_mostly;
  56
  57 /* Update system visible IP port range */
  58 static void set_local_port_range(struct net *net, int range[2])
  59 {
  60         bool same_parity = !((range[0] ^ range[1]) & 1);
  61
  62         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  63         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  64                 net->ipv4.ip_local_ports.warned = true;
  65                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  66         }
  67         net->ipv4.ip_local_ports.range[0] = range[0];
  68         net->ipv4.ip_local_ports.range[1] = range[1];
  69         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  70 }
  71
  72 /* Validate changes from /proc interface. */
  73 static int ipv4_local_port_range(struct ctl_table *table, int write,
  74                                  void __user *buffer,
  75                                  size_t *lenp, loff_t *ppos)
  76 {
  77         struct net *net =
  78                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  79         int ret;
  80         int range[2];
  81         struct ctl_table tmp = {
  82                 .data = &range,
  83                 .maxlen = sizeof(range),
  84                 .mode = table->mode,
  85                 .extra1 = &ip_local_port_range_min,
  86                 .extra2 = &ip_local_port_range_max,
  87         };
  88
  89         inet_get_local_port_range(net, &range[0], &range[1]);
  90
  91         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  92
  93         if (write && ret == 0) {
  94                 /* Ensure that the upper limit is not smaller than the lower,
  95                  * and that the lower does not encroach upon the privileged
  96                  * port limit.
  97                  */
  98                 if ((range[1] < range[0]) ||
  99                     (range[0] < net->ipv4.sysctl_ip_prot_sock))
 100                         ret = -EINVAL;
 101                 else
 102                         set_local_port_range(net, range);
 103         }
 104
 105         return ret;
 106 }
 107
 108 /* Validate changes from /proc interface. */
 109 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 110                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 111 {
 112         struct net *net = container_of(table->data, struct net,
 113             ipv4.sysctl_ip_prot_sock);
 114         int ret;
 115         int pports;
 116         int range[2];
 117         struct ctl_table tmp = {
 118                 .data = &pports,
 119                 .maxlen = sizeof(pports),
 120                 .mode = table->mode,
 121                 .extra1 = &ip_privileged_port_min,
 122                 .extra2 = &ip_privileged_port_max,
 123         };
 124
 125         pports = net->ipv4.sysctl_ip_prot_sock;
 126
 127         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 128
 129         if (write && ret == 0) {
 130                 inet_get_local_port_range(net, &range[0], &range[1]);
 131                 /* Ensure that the local port range doesn't overlap with the
 132                  * privileged port range.
 133                  */
 134                 if (range[0] < pports)
 135                         ret = -EINVAL;
 136                 else
 137                         net->ipv4.sysctl_ip_prot_sock = pports;
 138         }
 139
 140         return ret;
 141 }
 142
 143 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 144 {
 145         kgid_t *data = table->data;
 146         struct net *net =
 147                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 148         unsigned int seq;
 149         do {
 150                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 151
 152                 *low = data[0];
 153                 *high = data[1];
 154         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 155 }
 156
 157 /* Update system visible IP port range */
 158 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 159 {
 160         kgid_t *data = table->data;
 161         struct net *net =
 162                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 163         write_seqlock(&net->ipv4.ping_group_range.lock);
 164         data[0] = low;
 165         data[1] = high;
 166         write_sequnlock(&net->ipv4.ping_group_range.lock);
 167 }
 168
 169 /* Validate changes from /proc interface. */
 170 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 171                                  void __user *buffer,
 172                                  size_t *lenp, loff_t *ppos)
 173 {
 174         struct user_namespace *user_ns = current_user_ns();
 175         int ret;
 176         gid_t urange[2];
 177         kgid_t low, high;
 178         struct ctl_table tmp = {
 179                 .data = &urange,
 180                 .maxlen = sizeof(urange),
 181                 .mode = table->mode,
 182                 .extra1 = &ip_ping_group_range_min,
 183                 .extra2 = &ip_ping_group_range_max,
 184         };
 185
 186         inet_get_ping_group_range_table(table, &low, &high);
 187         urange[0] = from_kgid_munged(user_ns, low);
 188         urange[1] = from_kgid_munged(user_ns, high);
 189         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 190
 191         if (write && ret == 0) {
 192                 low = make_kgid(user_ns, urange[0]);
 193                 high = make_kgid(user_ns, urange[1]);
 194                 if (!gid_valid(low) || !gid_valid(high))
 195                         return -EINVAL;
 196                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 197                         low = make_kgid(&init_user_ns, 1);
 198                         high = make_kgid(&init_user_ns, 0);
 199                 }
 200                 set_ping_group_range(table, low, high);
 201         }
 202
 203         return ret;
 204 }
 205
 206 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 207                                     void __user *buffer,
 208                                     size_t *lenp, loff_t *ppos)
 209 {
 210         struct net *net;
 211         int ret;
 212
 213         net = container_of(table->data, struct net,
 214                            ipv4.sysctl_ip_fwd_update_priority);
 215         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 216         if (write && ret == 0)
 217                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 218                                         net);
 219
 220         return ret;
 221 }
 222
 223 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 224                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 225 {
 226         struct net *net = container_of(ctl->data, struct net,
 227                                        ipv4.tcp_congestion_control);
 228         char val[TCP_CA_NAME_MAX];
 229         struct ctl_table tbl = {
 230                 .data = val,
 231                 .maxlen = TCP_CA_NAME_MAX,
 232         };
 233         int ret;
 234
 235         tcp_get_default_congestion_control(net, val);
 236
 237         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 238         if (write && ret == 0)
 239                 ret = tcp_set_default_congestion_control(net, val);
 240         return ret;
 241 }
 242
 243 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 244                                                  int write,
 245                                                  void __user *buffer, size_t *lenp,
 246                                                  loff_t *ppos)
 247 {
 248         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 249         int ret;
 250
 251         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 252         if (!tbl.data)
 253                 return -ENOMEM;
 254         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 255         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 256         kfree(tbl.data);
 257         return ret;
 258 }
 259
 260 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 261                                            int write,
 262                                            void __user *buffer, size_t *lenp,
 263                                            loff_t *ppos)
 264 {
 265         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 266         int ret;
 267
 268         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 269         if (!tbl.data)
 270                 return -ENOMEM;
 271
 272         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 273         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 274         if (write && ret == 0)
 275                 ret = tcp_set_allowed_congestion_control(tbl.data);
 276         kfree(tbl.data);
 277         return ret;
 278 }
 279
 280 static int sscanf_key(char *buf, __le32 *key)
 281 {
 282         u32 user_key[4];
 283         int i, ret = 0;
 284
 285         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 286                    user_key + 2, user_key + 3) != 4) {
 287                 ret = -EINVAL;
 288         } else {
 289                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 290                         key[i] = cpu_to_le32(user_key[i]);
 291         }
 292         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 293                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 294
 295         return ret;
 296 }
 297
 298 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 299                                  void __user *buffer, size_t *lenp,
 300                                  loff_t *ppos)
 301 {
 302         struct net *net = container_of(table->data, struct net,
 303             ipv4.sysctl_tcp_fastopen);
 304         /* maxlen to print the list of keys in hex (*2), with dashes
 305          * separating doublewords and a comma in between keys.
 306          */
 307         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 308                                             2 * TCP_FASTOPEN_KEY_MAX) +
 309                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 310         struct tcp_fastopen_context *ctx;
 311         u32 user_key[TCP_FASTOPEN_KEY_MAX * 4];
 312         __le32 key[TCP_FASTOPEN_KEY_MAX * 4];
 313         char *backup_data;
 314         int ret, i = 0, off = 0, n_keys = 0;
 315
 316         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 317         if (!tbl.data)
 318                 return -ENOMEM;
 319
 320         rcu_read_lock();
 321         ctx = rcu_dereference(net->ipv4.tcp_fastopen_ctx);
 322         if (ctx) {
 323                 n_keys = tcp_fastopen_context_len(ctx);
 324                 memcpy(&key[0], &ctx->key[0], TCP_FASTOPEN_KEY_LENGTH * n_keys);
 325         }
 326         rcu_read_unlock();
 327
 328         if (!n_keys) {
 329                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 330                 n_keys = 1;
 331         }
 332
 333         for (i = 0; i < n_keys * 4; i++)
 334                 user_key[i] = le32_to_cpu(key[i]);
 335
 336         for (i = 0; i < n_keys; i++) {
 337                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 338                                 "%08x-%08x-%08x-%08x",
 339                                 user_key[i * 4],
 340                                 user_key[i * 4 + 1],
 341                                 user_key[i * 4 + 2],
 342                                 user_key[i * 4 + 3]);
 343                 if (i + 1 < n_keys)
 344                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 345         }
 346
 347         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 348
 349         if (write && ret == 0) {
 350                 backup_data = strchr(tbl.data, ',');
 351                 if (backup_data) {
 352                         *backup_data = '\0';
 353                         backup_data++;
 354                 }
 355                 if (sscanf_key(tbl.data, key)) {
 356                         ret = -EINVAL;
 357                         goto bad_key;
 358                 }
 359                 if (backup_data) {
 360                         if (sscanf_key(backup_data, key + 4)) {
 361                                 ret = -EINVAL;
 362                                 goto bad_key;
 363                         }
 364                 }
 365                 tcp_fastopen_reset_cipher(net, NULL, key,
 366                                           backup_data ? key + 4 : NULL);
 367         }
 368
 369 bad_key:
 370         kfree(tbl.data);
 371         return ret;
 372 }
 373
 374 static void proc_configure_early_demux(int enabled, int protocol)
 375 {
 376         struct net_protocol *ipprot;
 377 #if IS_ENABLED(CONFIG_IPV6)
 378         struct inet6_protocol *ip6prot;
 379 #endif
 380
 381         rcu_read_lock();
 382
 383         ipprot = rcu_dereference(inet_protos[protocol]);
 384         if (ipprot)
 385                 ipprot->early_demux = enabled ? ipprot->early_demux_handler :
 386                                                 NULL;
 387
 388 #if IS_ENABLED(CONFIG_IPV6)
 389         ip6prot = rcu_dereference(inet6_protos[protocol]);
 390         if (ip6prot)
 391                 ip6prot->early_demux = enabled ? ip6prot->early_demux_handler :
 392                                                  NULL;
 393 #endif
 394         rcu_read_unlock();
 395 }
 396
 397 static int proc_tcp_early_demux(struct ctl_table *table, int write,
 398                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 399 {
 400         int ret = 0;
 401
 402         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 403
 404         if (write && !ret) {
 405                 int enabled = init_net.ipv4.sysctl_tcp_early_demux;
 406
 407                 proc_configure_early_demux(enabled, IPPROTO_TCP);
 408         }
 409
 410         return ret;
 411 }
 412
 413 static int proc_udp_early_demux(struct ctl_table *table, int write,
 414                                 void __user *buffer, size_t *lenp, loff_t *ppos)
 415 {
 416         int ret = 0;
 417
 418         ret = proc_dointvec(table, write, buffer, lenp, ppos);
 419
 420         if (write && !ret) {
 421                 int enabled = init_net.ipv4.sysctl_udp_early_demux;
 422
 423                 proc_configure_early_demux(enabled, IPPROTO_UDP);
 424         }
 425
 426         return ret;
 427 }
 428
 429 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 430                                              int write,
 431                                              void __user *buffer,
 432                                              size_t *lenp, loff_t *ppos)
 433 {
 434         struct net *net = container_of(table->data, struct net,
 435             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 436         int ret;
 437
 438         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 439         if (write && ret == 0)
 440                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 441
 442         return ret;
 443 }
 444
 445 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 446                                   int write,
 447                                   void __user *buffer, size_t *lenp,
 448                                   loff_t *ppos)
 449 {
 450         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 451         int ret;
 452
 453         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 454         if (!tbl.data)
 455                 return -ENOMEM;
 456         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 457         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 458         kfree(tbl.data);
 459
 460         return ret;
 461 }
 462
 463 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 464 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 465                                           void __user *buffer, size_t *lenp,
 466                                           loff_t *ppos)
 467 {
 468         struct net *net = container_of(table->data, struct net,
 469             ipv4.sysctl_fib_multipath_hash_policy);
 470         int ret;
 471
 472         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 473         if (write && ret == 0)
 474                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 475
 476         return ret;
 477 }
 478 #endif
 479
 480 static struct ctl_table ipv4_table[] = {
 481         {
 482                 .procname       = "tcp_max_orphans",
 483                 .data           = &sysctl_tcp_max_orphans,
 484                 .maxlen         = sizeof(int),
 485                 .mode           = 0644,
 486                 .proc_handler   = proc_dointvec
 487         },
 488         {
 489                 .procname       = "inet_peer_threshold",
 490                 .data           = &inet_peer_threshold,
 491                 .maxlen         = sizeof(int),
 492                 .mode           = 0644,
 493                 .proc_handler   = proc_dointvec
 494         },
 495         {
 496                 .procname       = "inet_peer_minttl",
 497                 .data           = &inet_peer_minttl,
 498                 .maxlen         = sizeof(int),
 499                 .mode           = 0644,
 500                 .proc_handler   = proc_dointvec_jiffies,
 501         },
 502         {
 503                 .procname       = "inet_peer_maxttl",
 504                 .data           = &inet_peer_maxttl,
 505                 .maxlen         = sizeof(int),
 506                 .mode           = 0644,
 507                 .proc_handler   = proc_dointvec_jiffies,
 508         },
 509         {
 510                 .procname       = "tcp_mem",
 511                 .maxlen         = sizeof(sysctl_tcp_mem),
 512                 .data           = &sysctl_tcp_mem,
 513                 .mode           = 0644,
 514                 .proc_handler   = proc_doulongvec_minmax,
 515         },
 516         {
 517                 .procname       = "tcp_low_latency",
 518                 .data           = &sysctl_tcp_low_latency,
 519                 .maxlen         = sizeof(int),
 520                 .mode           = 0644,
 521                 .proc_handler   = proc_dointvec
 522         },
 523 #ifdef CONFIG_NETLABEL
 524         {
 525                 .procname       = "cipso_cache_enable",
 526                 .data           = &cipso_v4_cache_enabled,
 527                 .maxlen         = sizeof(int),
 528                 .mode           = 0644,
 529                 .proc_handler   = proc_dointvec,
 530         },
 531         {
 532                 .procname       = "cipso_cache_bucket_size",
 533                 .data           = &cipso_v4_cache_bucketsize,
 534                 .maxlen         = sizeof(int),
 535                 .mode           = 0644,
 536                 .proc_handler   = proc_dointvec,
 537         },
 538         {
 539                 .procname       = "cipso_rbm_optfmt",
 540                 .data           = &cipso_v4_rbm_optfmt,
 541                 .maxlen         = sizeof(int),
 542                 .mode           = 0644,
 543                 .proc_handler   = proc_dointvec,
 544         },
 545         {
 546                 .procname       = "cipso_rbm_strictvalid",
 547                 .data           = &cipso_v4_rbm_strictvalid,
 548                 .maxlen         = sizeof(int),
 549                 .mode           = 0644,
 550                 .proc_handler   = proc_dointvec,
 551         },
 552 #endif /* CONFIG_NETLABEL */
 553         {
 554                 .procname       = "tcp_available_congestion_control",
 555                 .maxlen         = TCP_CA_BUF_MAX,
 556                 .mode           = 0444,
 557                 .proc_handler   = proc_tcp_available_congestion_control,
 558         },
 559         {
 560                 .procname       = "tcp_allowed_congestion_control",
 561                 .maxlen         = TCP_CA_BUF_MAX,
 562                 .mode           = 0644,
 563                 .proc_handler   = proc_allowed_congestion_control,
 564         },
 565         {
 566                 .procname       = "tcp_available_ulp",
 567                 .maxlen         = TCP_ULP_BUF_MAX,
 568                 .mode           = 0444,
 569                 .proc_handler   = proc_tcp_available_ulp,
 570         },
 571         {
 572                 .procname       = "icmp_msgs_per_sec",
 573                 .data           = &sysctl_icmp_msgs_per_sec,
 574                 .maxlen         = sizeof(int),
 575                 .mode           = 0644,
 576                 .proc_handler   = proc_dointvec_minmax,
 577                 .extra1         = SYSCTL_ZERO,
 578         },
 579         {
 580                 .procname       = "icmp_msgs_burst",
 581                 .data           = &sysctl_icmp_msgs_burst,
 582                 .maxlen         = sizeof(int),
 583                 .mode           = 0644,
 584                 .proc_handler   = proc_dointvec_minmax,
 585                 .extra1         = SYSCTL_ZERO,
 586         },
 587         {
 588                 .procname       = "udp_mem",
 589                 .data           = &sysctl_udp_mem,
 590                 .maxlen         = sizeof(sysctl_udp_mem),
 591                 .mode           = 0644,
 592                 .proc_handler   = proc_doulongvec_minmax,
 593         },
 594         {
 595                 .procname       = "fib_sync_mem",
 596                 .data           = &sysctl_fib_sync_mem,
 597                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 598                 .mode           = 0644,
 599                 .proc_handler   = proc_douintvec_minmax,
 600                 .extra1         = &sysctl_fib_sync_mem_min,
 601                 .extra2         = &sysctl_fib_sync_mem_max,
 602         },
 603         {
 604                 .procname       = "tcp_rx_skb_cache",
 605                 .data           = &tcp_rx_skb_cache_key.key,
 606                 .mode           = 0644,
 607                 .proc_handler   = proc_do_static_key,
 608         },
 609         {
 610                 .procname       = "tcp_tx_skb_cache",
 611                 .data           = &tcp_tx_skb_cache_key.key,
 612                 .mode           = 0644,
 613                 .proc_handler   = proc_do_static_key,
 614         },
 615         { }
 616 };
 617
 618 static struct ctl_table ipv4_net_table[] = {
 619         {
 620                 .procname       = "icmp_echo_ignore_all",
 621                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = proc_dointvec
 625         },
 626         {
 627                 .procname       = "icmp_echo_ignore_broadcasts",
 628                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 629                 .maxlen         = sizeof(int),
 630                 .mode           = 0644,
 631                 .proc_handler   = proc_dointvec
 632         },
 633         {
 634                 .procname       = "icmp_ignore_bogus_error_responses",
 635                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 636                 .maxlen         = sizeof(int),
 637                 .mode           = 0644,
 638                 .proc_handler   = proc_dointvec
 639         },
 640         {
 641                 .procname       = "icmp_errors_use_inbound_ifaddr",
 642                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 643                 .maxlen         = sizeof(int),
 644                 .mode           = 0644,
 645                 .proc_handler   = proc_dointvec
 646         },
 647         {
 648                 .procname       = "icmp_ratelimit",
 649                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 650                 .maxlen         = sizeof(int),
 651                 .mode           = 0644,
 652                 .proc_handler   = proc_dointvec_ms_jiffies,
 653         },
 654         {
 655                 .procname       = "icmp_ratemask",
 656                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 657                 .maxlen         = sizeof(int),
 658                 .mode           = 0644,
 659                 .proc_handler   = proc_dointvec
 660         },
 661         {
 662                 .procname       = "ping_group_range",
 663                 .data           = &init_net.ipv4.ping_group_range.range,
 664                 .maxlen         = sizeof(gid_t)*2,
 665                 .mode           = 0644,
 666                 .proc_handler   = ipv4_ping_group_range,
 667         },
 668 #ifdef CONFIG_NET_L3_MASTER_DEV
 669         {
 670                 .procname       = "raw_l3mdev_accept",
 671                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = proc_dointvec_minmax,
 675                 .extra1         = SYSCTL_ZERO,
 676                 .extra2         = SYSCTL_ONE,
 677         },
 678 #endif
 679         {
 680                 .procname       = "tcp_ecn",
 681                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 682                 .maxlen         = sizeof(int),
 683                 .mode           = 0644,
 684                 .proc_handler   = proc_dointvec
 685         },
 686         {
 687                 .procname       = "tcp_ecn_fallback",
 688                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 689                 .maxlen         = sizeof(int),
 690                 .mode           = 0644,
 691                 .proc_handler   = proc_dointvec
 692         },
 693         {
 694                 .procname       = "ip_dynaddr",
 695                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 696                 .maxlen         = sizeof(int),
 697                 .mode           = 0644,
 698                 .proc_handler   = proc_dointvec
 699         },
 700         {
 701                 .procname       = "ip_early_demux",
 702                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 703                 .maxlen         = sizeof(int),
 704                 .mode           = 0644,
 705                 .proc_handler   = proc_dointvec
 706         },
 707         {
 708                 .procname       = "udp_early_demux",
 709                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 710                 .maxlen         = sizeof(int),
 711                 .mode           = 0644,
 712                 .proc_handler   = proc_udp_early_demux
 713         },
 714         {
 715                 .procname       = "tcp_early_demux",
 716                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 717                 .maxlen         = sizeof(int),
 718                 .mode           = 0644,
 719                 .proc_handler   = proc_tcp_early_demux
 720         },
 721         {
 722                 .procname       = "ip_default_ttl",
 723                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 724                 .maxlen         = sizeof(int),
 725                 .mode           = 0644,
 726                 .proc_handler   = proc_dointvec_minmax,
 727                 .extra1         = &ip_ttl_min,
 728                 .extra2         = &ip_ttl_max,
 729         },
 730         {
 731                 .procname       = "ip_local_port_range",
 732                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 733                 .data           = &init_net.ipv4.ip_local_ports.range,
 734                 .mode           = 0644,
 735                 .proc_handler   = ipv4_local_port_range,
 736         },
 737         {
 738                 .procname       = "ip_local_reserved_ports",
 739                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 740                 .maxlen         = 65536,
 741                 .mode           = 0644,
 742                 .proc_handler   = proc_do_large_bitmap,
 743         },
 744         {
 745                 .procname       = "ip_no_pmtu_disc",
 746                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 747                 .maxlen         = sizeof(int),
 748                 .mode           = 0644,
 749                 .proc_handler   = proc_dointvec
 750         },
 751         {
 752                 .procname       = "ip_forward_use_pmtu",
 753                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 754                 .maxlen         = sizeof(int),
 755                 .mode           = 0644,
 756                 .proc_handler   = proc_dointvec,
 757         },
 758         {
 759                 .procname       = "ip_forward_update_priority",
 760                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 761                 .maxlen         = sizeof(int),
 762                 .mode           = 0644,
 763                 .proc_handler   = ipv4_fwd_update_priority,
 764                 .extra1         = SYSCTL_ZERO,
 765                 .extra2         = SYSCTL_ONE,
 766         },
 767         {
 768                 .procname       = "ip_nonlocal_bind",
 769                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 770                 .maxlen         = sizeof(int),
 771                 .mode           = 0644,
 772                 .proc_handler   = proc_dointvec
 773         },
 774         {
 775                 .procname       = "fwmark_reflect",
 776                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 777                 .maxlen         = sizeof(int),
 778                 .mode           = 0644,
 779                 .proc_handler   = proc_dointvec,
 780         },
 781         {
 782                 .procname       = "tcp_fwmark_accept",
 783                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 784                 .maxlen         = sizeof(int),
 785                 .mode           = 0644,
 786                 .proc_handler   = proc_dointvec,
 787         },
 788 #ifdef CONFIG_NET_L3_MASTER_DEV
 789         {
 790                 .procname       = "tcp_l3mdev_accept",
 791                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 792                 .maxlen         = sizeof(int),
 793                 .mode           = 0644,
 794                 .proc_handler   = proc_dointvec_minmax,
 795                 .extra1         = SYSCTL_ZERO,
 796                 .extra2         = SYSCTL_ONE,
 797         },
 798 #endif
 799         {
 800                 .procname       = "tcp_mtu_probing",
 801                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 802                 .maxlen         = sizeof(int),
 803                 .mode           = 0644,
 804                 .proc_handler   = proc_dointvec,
 805         },
 806         {
 807                 .procname       = "tcp_base_mss",
 808                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 809                 .maxlen         = sizeof(int),
 810                 .mode           = 0644,
 811                 .proc_handler   = proc_dointvec,
 812         },
 813         {
 814                 .procname       = "tcp_min_snd_mss",
 815                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 816                 .maxlen         = sizeof(int),
 817                 .mode           = 0644,
 818                 .proc_handler   = proc_dointvec_minmax,
 819                 .extra1         = &tcp_min_snd_mss_min,
 820                 .extra2         = &tcp_min_snd_mss_max,
 821         },
 822         {
 823                 .procname       = "tcp_probe_threshold",
 824                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 825                 .maxlen         = sizeof(int),
 826                 .mode           = 0644,
 827                 .proc_handler   = proc_dointvec,
 828         },
 829         {
 830                 .procname       = "tcp_probe_interval",
 831                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 832                 .maxlen         = sizeof(u32),
 833                 .mode           = 0644,
 834                 .proc_handler   = proc_douintvec_minmax,
 835                 .extra2         = &u32_max_div_HZ,
 836         },
 837         {
 838                 .procname       = "igmp_link_local_mcast_reports",
 839                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 840                 .maxlen         = sizeof(int),
 841                 .mode           = 0644,
 842                 .proc_handler   = proc_dointvec
 843         },
 844         {
 845                 .procname       = "igmp_max_memberships",
 846                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 847                 .maxlen         = sizeof(int),
 848                 .mode           = 0644,
 849                 .proc_handler   = proc_dointvec
 850         },
 851         {
 852                 .procname       = "igmp_max_msf",
 853                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 854                 .maxlen         = sizeof(int),
 855                 .mode           = 0644,
 856                 .proc_handler   = proc_dointvec
 857         },
 858 #ifdef CONFIG_IP_MULTICAST
 859         {
 860                 .procname       = "igmp_qrv",
 861                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 862                 .maxlen         = sizeof(int),
 863                 .mode           = 0644,
 864                 .proc_handler   = proc_dointvec_minmax,
 865                 .extra1         = SYSCTL_ONE
 866         },
 867 #endif
 868         {
 869                 .procname       = "tcp_congestion_control",
 870                 .data           = &init_net.ipv4.tcp_congestion_control,
 871                 .mode           = 0644,
 872                 .maxlen         = TCP_CA_NAME_MAX,
 873                 .proc_handler   = proc_tcp_congestion_control,
 874         },
 875         {
 876                 .procname       = "tcp_keepalive_time",
 877                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 878                 .maxlen         = sizeof(int),
 879                 .mode           = 0644,
 880                 .proc_handler   = proc_dointvec_jiffies,
 881         },
 882         {
 883                 .procname       = "tcp_keepalive_probes",
 884                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 885                 .maxlen         = sizeof(int),
 886                 .mode           = 0644,
 887                 .proc_handler   = proc_dointvec
 888         },
 889         {
 890                 .procname       = "tcp_keepalive_intvl",
 891                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 892                 .maxlen         = sizeof(int),
 893                 .mode           = 0644,
 894                 .proc_handler   = proc_dointvec_jiffies,
 895         },
 896         {
 897                 .procname       = "tcp_syn_retries",
 898                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 899                 .maxlen         = sizeof(int),
 900                 .mode           = 0644,
 901                 .proc_handler   = proc_dointvec_minmax,
 902                 .extra1         = &tcp_syn_retries_min,
 903                 .extra2         = &tcp_syn_retries_max
 904         },
 905         {
 906                 .procname       = "tcp_synack_retries",
 907                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 908                 .maxlen         = sizeof(int),
 909                 .mode           = 0644,
 910                 .proc_handler   = proc_dointvec
 911         },
 912 #ifdef CONFIG_SYN_COOKIES
 913         {
 914                 .procname       = "tcp_syncookies",
 915                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 916                 .maxlen         = sizeof(int),
 917                 .mode           = 0644,
 918                 .proc_handler   = proc_dointvec
 919         },
 920 #endif
 921         {
 922                 .procname       = "tcp_reordering",
 923                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 924                 .maxlen         = sizeof(int),
 925                 .mode           = 0644,
 926                 .proc_handler   = proc_dointvec
 927         },
 928         {
 929                 .procname       = "tcp_retries1",
 930                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 931                 .maxlen         = sizeof(int),
 932                 .mode           = 0644,
 933                 .proc_handler   = proc_dointvec_minmax,
 934                 .extra2         = &tcp_retr1_max
 935         },
 936         {
 937                 .procname       = "tcp_retries2",
 938                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 939                 .maxlen         = sizeof(int),
 940                 .mode           = 0644,
 941                 .proc_handler   = proc_dointvec
 942         },
 943         {
 944                 .procname       = "tcp_orphan_retries",
 945                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 946                 .maxlen         = sizeof(int),
 947                 .mode           = 0644,
 948                 .proc_handler   = proc_dointvec
 949         },
 950         {
 951                 .procname       = "tcp_fin_timeout",
 952                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 953                 .maxlen         = sizeof(int),
 954                 .mode           = 0644,
 955                 .proc_handler   = proc_dointvec_jiffies,
 956         },
 957         {
 958                 .procname       = "tcp_notsent_lowat",
 959                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 960                 .maxlen         = sizeof(unsigned int),
 961                 .mode           = 0644,
 962                 .proc_handler   = proc_douintvec,
 963         },
 964         {
 965                 .procname       = "tcp_tw_reuse",
 966                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 967                 .maxlen         = sizeof(int),
 968                 .mode           = 0644,
 969                 .proc_handler   = proc_dointvec_minmax,
 970                 .extra1         = SYSCTL_ZERO,
 971                 .extra2         = &two,
 972         },
 973         {
 974                 .procname       = "tcp_max_tw_buckets",
 975                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 976                 .maxlen         = sizeof(int),
 977                 .mode           = 0644,
 978                 .proc_handler   = proc_dointvec
 979         },
 980         {
 981                 .procname       = "tcp_max_syn_backlog",
 982                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 983                 .maxlen         = sizeof(int),
 984                 .mode           = 0644,
 985                 .proc_handler   = proc_dointvec
 986         },
 987         {
 988                 .procname       = "tcp_fastopen",
 989                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 990                 .maxlen         = sizeof(int),
 991                 .mode           = 0644,
 992                 .proc_handler   = proc_dointvec,
 993         },
 994         {
 995                 .procname       = "tcp_fastopen_key",
 996                 .mode           = 0600,
 997                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 998                 /* maxlen to print the list of keys in hex (*2), with dashes
 999                  * separating doublewords and a comma in between keys.
1000                  */
1001                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1002                                    2 * TCP_FASTOPEN_KEY_MAX) +
1003                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1004                 .proc_handler   = proc_tcp_fastopen_key,
1005         },
1006         {
1007                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1008                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1009                 .maxlen         = sizeof(int),
1010                 .mode           = 0644,
1011                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1012                 .extra1         = SYSCTL_ZERO,
1013         },
1014 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1015         {
1016                 .procname       = "fib_multipath_use_neigh",
1017                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1018                 .maxlen         = sizeof(int),
1019                 .mode           = 0644,
1020                 .proc_handler   = proc_dointvec_minmax,
1021                 .extra1         = SYSCTL_ZERO,
1022                 .extra2         = SYSCTL_ONE,
1023         },
1024         {
1025                 .procname       = "fib_multipath_hash_policy",
1026                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1027                 .maxlen         = sizeof(int),
1028                 .mode           = 0644,
1029                 .proc_handler   = proc_fib_multipath_hash_policy,
1030                 .extra1         = SYSCTL_ZERO,
1031                 .extra2         = SYSCTL_ONE,
1032         },
1033 #endif
1034         {
1035                 .procname       = "ip_unprivileged_port_start",
1036                 .maxlen         = sizeof(int),
1037                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1038                 .mode           = 0644,
1039                 .proc_handler   = ipv4_privileged_ports,
1040         },
1041 #ifdef CONFIG_NET_L3_MASTER_DEV
1042         {
1043                 .procname       = "udp_l3mdev_accept",
1044                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1045                 .maxlen         = sizeof(int),
1046                 .mode           = 0644,
1047                 .proc_handler   = proc_dointvec_minmax,
1048                 .extra1         = SYSCTL_ZERO,
1049                 .extra2         = SYSCTL_ONE,
1050         },
1051 #endif
1052         {
1053                 .procname       = "tcp_sack",
1054                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1055                 .maxlen         = sizeof(int),
1056                 .mode           = 0644,
1057                 .proc_handler   = proc_dointvec
1058         },
1059         {
1060                 .procname       = "tcp_window_scaling",
1061                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1062                 .maxlen         = sizeof(int),
1063                 .mode           = 0644,
1064                 .proc_handler   = proc_dointvec
1065         },
1066         {
1067                 .procname       = "tcp_timestamps",
1068                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1069                 .maxlen         = sizeof(int),
1070                 .mode           = 0644,
1071                 .proc_handler   = proc_dointvec
1072         },
1073         {
1074                 .procname       = "tcp_early_retrans",
1075                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1076                 .maxlen         = sizeof(int),
1077                 .mode           = 0644,
1078                 .proc_handler   = proc_dointvec_minmax,
1079                 .extra1         = SYSCTL_ZERO,
1080                 .extra2         = &four,
1081         },
1082         {
1083                 .procname       = "tcp_recovery",
1084                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1085                 .maxlen         = sizeof(int),
1086                 .mode           = 0644,
1087                 .proc_handler   = proc_dointvec,
1088         },
1089         {
1090                 .procname       = "tcp_thin_linear_timeouts",
1091                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1092                 .maxlen         = sizeof(int),
1093                 .mode           = 0644,
1094                 .proc_handler   = proc_dointvec
1095         },
1096         {
1097                 .procname       = "tcp_slow_start_after_idle",
1098                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1099                 .maxlen         = sizeof(int),
1100                 .mode           = 0644,
1101                 .proc_handler   = proc_dointvec
1102         },
1103         {
1104                 .procname       = "tcp_retrans_collapse",
1105                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1106                 .maxlen         = sizeof(int),
1107                 .mode           = 0644,
1108                 .proc_handler   = proc_dointvec
1109         },
1110         {
1111                 .procname       = "tcp_stdurg",
1112                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1113                 .maxlen         = sizeof(int),
1114                 .mode           = 0644,
1115                 .proc_handler   = proc_dointvec
1116         },
1117         {
1118                 .procname       = "tcp_rfc1337",
1119                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1120                 .maxlen         = sizeof(int),
1121                 .mode           = 0644,
1122                 .proc_handler   = proc_dointvec
1123         },
1124         {
1125                 .procname       = "tcp_abort_on_overflow",
1126                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1127                 .maxlen         = sizeof(int),
1128                 .mode           = 0644,
1129                 .proc_handler   = proc_dointvec
1130         },
1131         {
1132                 .procname       = "tcp_fack",
1133                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1134                 .maxlen         = sizeof(int),
1135                 .mode           = 0644,
1136                 .proc_handler   = proc_dointvec
1137         },
1138         {
1139                 .procname       = "tcp_max_reordering",
1140                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1141                 .maxlen         = sizeof(int),
1142                 .mode           = 0644,
1143                 .proc_handler   = proc_dointvec
1144         },
1145         {
1146                 .procname       = "tcp_dsack",
1147                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1148                 .maxlen         = sizeof(int),
1149                 .mode           = 0644,
1150                 .proc_handler   = proc_dointvec
1151         },
1152         {
1153                 .procname       = "tcp_app_win",
1154                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1155                 .maxlen         = sizeof(int),
1156                 .mode           = 0644,
1157                 .proc_handler   = proc_dointvec
1158         },
1159         {
1160                 .procname       = "tcp_adv_win_scale",
1161                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1162                 .maxlen         = sizeof(int),
1163                 .mode           = 0644,
1164                 .proc_handler   = proc_dointvec_minmax,
1165                 .extra1         = &tcp_adv_win_scale_min,
1166                 .extra2         = &tcp_adv_win_scale_max,
1167         },
1168         {
1169                 .procname       = "tcp_frto",
1170                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1171                 .maxlen         = sizeof(int),
1172                 .mode           = 0644,
1173                 .proc_handler   = proc_dointvec
1174         },
1175         {
1176                 .procname       = "tcp_no_metrics_save",
1177                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1178                 .maxlen         = sizeof(int),
1179                 .mode           = 0644,
1180                 .proc_handler   = proc_dointvec,
1181         },
1182         {
1183                 .procname       = "tcp_moderate_rcvbuf",
1184                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1185                 .maxlen         = sizeof(int),
1186                 .mode           = 0644,
1187                 .proc_handler   = proc_dointvec,
1188         },
1189         {
1190                 .procname       = "tcp_tso_win_divisor",
1191                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1192                 .maxlen         = sizeof(int),
1193                 .mode           = 0644,
1194                 .proc_handler   = proc_dointvec,
1195         },
1196         {
1197                 .procname       = "tcp_workaround_signed_windows",
1198                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1199                 .maxlen         = sizeof(int),
1200                 .mode           = 0644,
1201                 .proc_handler   = proc_dointvec
1202         },
1203         {
1204                 .procname       = "tcp_limit_output_bytes",
1205                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1206                 .maxlen         = sizeof(int),
1207                 .mode           = 0644,
1208                 .proc_handler   = proc_dointvec
1209         },
1210         {
1211                 .procname       = "tcp_challenge_ack_limit",
1212                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1213                 .maxlen         = sizeof(int),
1214                 .mode           = 0644,
1215                 .proc_handler   = proc_dointvec
1216         },
1217         {
1218                 .procname       = "tcp_min_tso_segs",
1219                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1220                 .maxlen         = sizeof(int),
1221                 .mode           = 0644,
1222                 .proc_handler   = proc_dointvec_minmax,
1223                 .extra1         = SYSCTL_ONE,
1224                 .extra2         = &gso_max_segs,
1225         },
1226         {
1227                 .procname       = "tcp_min_rtt_wlen",
1228                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1229                 .maxlen         = sizeof(int),
1230                 .mode           = 0644,
1231                 .proc_handler   = proc_dointvec_minmax,
1232                 .extra1         = SYSCTL_ZERO,
1233                 .extra2         = &one_day_secs
1234         },
1235         {
1236                 .procname       = "tcp_autocorking",
1237                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1238                 .maxlen         = sizeof(int),
1239                 .mode           = 0644,
1240                 .proc_handler   = proc_dointvec_minmax,
1241                 .extra1         = SYSCTL_ZERO,
1242                 .extra2         = SYSCTL_ONE,
1243         },
1244         {
1245                 .procname       = "tcp_invalid_ratelimit",
1246                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1247                 .maxlen         = sizeof(int),
1248                 .mode           = 0644,
1249                 .proc_handler   = proc_dointvec_ms_jiffies,
1250         },
1251         {
1252                 .procname       = "tcp_pacing_ss_ratio",
1253                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1254                 .maxlen         = sizeof(int),
1255                 .mode           = 0644,
1256                 .proc_handler   = proc_dointvec_minmax,
1257                 .extra1         = SYSCTL_ZERO,
1258                 .extra2         = &thousand,
1259         },
1260         {
1261                 .procname       = "tcp_pacing_ca_ratio",
1262                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1263                 .maxlen         = sizeof(int),
1264                 .mode           = 0644,
1265                 .proc_handler   = proc_dointvec_minmax,
1266                 .extra1         = SYSCTL_ZERO,
1267                 .extra2         = &thousand,
1268         },
1269         {
1270                 .procname       = "tcp_wmem",
1271                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1272                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1273                 .mode           = 0644,
1274                 .proc_handler   = proc_dointvec_minmax,
1275                 .extra1         = SYSCTL_ONE,
1276         },
1277         {
1278                 .procname       = "tcp_rmem",
1279                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1280                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1281                 .mode           = 0644,
1282                 .proc_handler   = proc_dointvec_minmax,
1283                 .extra1         = SYSCTL_ONE,
1284         },
1285         {
1286                 .procname       = "tcp_comp_sack_delay_ns",
1287                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1288                 .maxlen         = sizeof(unsigned long),
1289                 .mode           = 0644,
1290                 .proc_handler   = proc_doulongvec_minmax,
1291         },
1292         {
1293                 .procname       = "tcp_comp_sack_nr",
1294                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1295                 .maxlen         = sizeof(int),
1296                 .mode           = 0644,
1297                 .proc_handler   = proc_dointvec_minmax,
1298                 .extra1         = SYSCTL_ZERO,
1299                 .extra2         = &comp_sack_nr_max,
1300         },
1301         {
1302                 .procname       = "udp_rmem_min",
1303                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1304                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1305                 .mode           = 0644,
1306                 .proc_handler   = proc_dointvec_minmax,
1307                 .extra1         = SYSCTL_ONE
1308         },
1309         {
1310                 .procname       = "udp_wmem_min",
1311                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1312                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1313                 .mode           = 0644,
1314                 .proc_handler   = proc_dointvec_minmax,
1315                 .extra1         = SYSCTL_ONE
1316         },
1317         { }
1318 };
1319
1320 static __net_init int ipv4_sysctl_init_net(struct net *net)
1321 {
1322         struct ctl_table *table;
1323
1324         table = ipv4_net_table;
1325         if (!net_eq(net, &init_net)) {
1326                 int i;
1327
1328                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1329                 if (!table)
1330                         goto err_alloc;
1331
1332                 /* Update the variables to point into the current struct net */
1333                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++)
1334                         table[i].data += (void *)net - (void *)&init_net;
1335         }
1336
1337         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1338         if (!net->ipv4.ipv4_hdr)
1339                 goto err_reg;
1340
1341         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1342         if (!net->ipv4.sysctl_local_reserved_ports)
1343                 goto err_ports;
1344
1345         return 0;
1346
1347 err_ports:
1348         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1349 err_reg:
1350         if (!net_eq(net, &init_net))
1351                 kfree(table);
1352 err_alloc:
1353         return -ENOMEM;
1354 }
1355
1356 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1357 {
1358         struct ctl_table *table;
1359
1360         kfree(net->ipv4.sysctl_local_reserved_ports);
1361         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1362         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1363         kfree(table);
1364 }
1365
1366 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1367         .init = ipv4_sysctl_init_net,
1368         .exit = ipv4_sysctl_exit_net,
1369 };
1370
1371 static __init int sysctl_ipv4_init(void)
1372 {
1373         struct ctl_table_header *hdr;
1374
1375         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1376         if (!hdr)
1377                 return -ENOMEM;
1378
1379         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1380                 unregister_net_sysctl_table(hdr);
1381                 return -ENOMEM;
1382         }
1383
1384         return 0;
1385 }
1386
1387 __initcall(sysctl_ipv4_init);