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 tcp_retr1_max = 255;
  35 static int ip_local_port_range_min[] = { 1, 1 };
  36 static int ip_local_port_range_max[] = { 65535, 65535 };
  37 static int tcp_adv_win_scale_min = -31;
  38 static int tcp_adv_win_scale_max = 31;
  39 static int tcp_app_win_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] < READ_ONCE(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 = READ_ONCE(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                         WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
 137         }
 138
 139         return ret;
 140 }
 141
 142 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 143 {
 144         kgid_t *data = table->data;
 145         struct net *net =
 146                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 147         unsigned int seq;
 148         do {
 149                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 150
 151                 *low = data[0];
 152                 *high = data[1];
 153         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 154 }
 155
 156 /* Update system visible IP port range */
 157 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 158 {
 159         kgid_t *data = table->data;
 160         struct net *net =
 161                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 162         write_seqlock(&net->ipv4.ping_group_range.lock);
 163         data[0] = low;
 164         data[1] = high;
 165         write_sequnlock(&net->ipv4.ping_group_range.lock);
 166 }
 167
 168 /* Validate changes from /proc interface. */
 169 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 170                                  void *buffer, size_t *lenp, loff_t *ppos)
 171 {
 172         struct user_namespace *user_ns = current_user_ns();
 173         int ret;
 174         gid_t urange[2];
 175         kgid_t low, high;
 176         struct ctl_table tmp = {
 177                 .data = &urange,
 178                 .maxlen = sizeof(urange),
 179                 .mode = table->mode,
 180                 .extra1 = &ip_ping_group_range_min,
 181                 .extra2 = &ip_ping_group_range_max,
 182         };
 183
 184         inet_get_ping_group_range_table(table, &low, &high);
 185         urange[0] = from_kgid_munged(user_ns, low);
 186         urange[1] = from_kgid_munged(user_ns, high);
 187         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 188
 189         if (write && ret == 0) {
 190                 low = make_kgid(user_ns, urange[0]);
 191                 high = make_kgid(user_ns, urange[1]);
 192                 if (!gid_valid(low) || !gid_valid(high))
 193                         return -EINVAL;
 194                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 195                         low = make_kgid(&init_user_ns, 1);
 196                         high = make_kgid(&init_user_ns, 0);
 197                 }
 198                 set_ping_group_range(table, low, high);
 199         }
 200
 201         return ret;
 202 }
 203
 204 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 205                                     void *buffer, size_t *lenp, loff_t *ppos)
 206 {
 207         struct net *net;
 208         int ret;
 209
 210         net = container_of(table->data, struct net,
 211                            ipv4.sysctl_ip_fwd_update_priority);
 212         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 213         if (write && ret == 0)
 214                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 215                                         net);
 216
 217         return ret;
 218 }
 219
 220 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 221                                        void *buffer, size_t *lenp, loff_t *ppos)
 222 {
 223         struct net *net = container_of(ctl->data, struct net,
 224                                        ipv4.tcp_congestion_control);
 225         char val[TCP_CA_NAME_MAX];
 226         struct ctl_table tbl = {
 227                 .data = val,
 228                 .maxlen = TCP_CA_NAME_MAX,
 229         };
 230         int ret;
 231
 232         tcp_get_default_congestion_control(net, val);
 233
 234         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 235         if (write && ret == 0)
 236                 ret = tcp_set_default_congestion_control(net, val);
 237         return ret;
 238 }
 239
 240 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 241                                                  int write, void *buffer,
 242                                                  size_t *lenp, loff_t *ppos)
 243 {
 244         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 245         int ret;
 246
 247         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 248         if (!tbl.data)
 249                 return -ENOMEM;
 250         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 251         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 252         kfree(tbl.data);
 253         return ret;
 254 }
 255
 256 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 257                                            int write, void *buffer,
 258                                            size_t *lenp, loff_t *ppos)
 259 {
 260         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 261         int ret;
 262
 263         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 264         if (!tbl.data)
 265                 return -ENOMEM;
 266
 267         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 268         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 269         if (write && ret == 0)
 270                 ret = tcp_set_allowed_congestion_control(tbl.data);
 271         kfree(tbl.data);
 272         return ret;
 273 }
 274
 275 static int sscanf_key(char *buf, __le32 *key)
 276 {
 277         u32 user_key[4];
 278         int i, ret = 0;
 279
 280         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 281                    user_key + 2, user_key + 3) != 4) {
 282                 ret = -EINVAL;
 283         } else {
 284                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 285                         key[i] = cpu_to_le32(user_key[i]);
 286         }
 287         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 288                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 289
 290         return ret;
 291 }
 292
 293 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 294                                  void *buffer, size_t *lenp, loff_t *ppos)
 295 {
 296         struct net *net = container_of(table->data, struct net,
 297             ipv4.sysctl_tcp_fastopen);
 298         /* maxlen to print the list of keys in hex (*2), with dashes
 299          * separating doublewords and a comma in between keys.
 300          */
 301         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 302                                             2 * TCP_FASTOPEN_KEY_MAX) +
 303                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 304         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 305         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 306         char *backup_data;
 307         int ret, i = 0, off = 0, n_keys;
 308
 309         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 310         if (!tbl.data)
 311                 return -ENOMEM;
 312
 313         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 314         if (!n_keys) {
 315                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 316                 n_keys = 1;
 317         }
 318
 319         for (i = 0; i < n_keys * 4; i++)
 320                 user_key[i] = le32_to_cpu(key[i]);
 321
 322         for (i = 0; i < n_keys; i++) {
 323                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 324                                 "%08x-%08x-%08x-%08x",
 325                                 user_key[i * 4],
 326                                 user_key[i * 4 + 1],
 327                                 user_key[i * 4 + 2],
 328                                 user_key[i * 4 + 3]);
 329
 330                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 331                         break;
 332
 333                 if (i + 1 < n_keys)
 334                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 335         }
 336
 337         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 338
 339         if (write && ret == 0) {
 340                 backup_data = strchr(tbl.data, ',');
 341                 if (backup_data) {
 342                         *backup_data = '\0';
 343                         backup_data++;
 344                 }
 345                 if (sscanf_key(tbl.data, key)) {
 346                         ret = -EINVAL;
 347                         goto bad_key;
 348                 }
 349                 if (backup_data) {
 350                         if (sscanf_key(backup_data, key + 4)) {
 351                                 ret = -EINVAL;
 352                                 goto bad_key;
 353                         }
 354                 }
 355                 tcp_fastopen_reset_cipher(net, NULL, key,
 356                                           backup_data ? key + 4 : NULL);
 357         }
 358
 359 bad_key:
 360         kfree(tbl.data);
 361         return ret;
 362 }
 363
 364 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 365                                              int write, void *buffer,
 366                                              size_t *lenp, loff_t *ppos)
 367 {
 368         struct net *net = container_of(table->data, struct net,
 369             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 370         int ret;
 371
 372         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 373         if (write && ret == 0)
 374                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 375
 376         return ret;
 377 }
 378
 379 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 380                                   int write, void *buffer, size_t *lenp,
 381                                   loff_t *ppos)
 382 {
 383         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 384         int ret;
 385
 386         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 387         if (!tbl.data)
 388                 return -ENOMEM;
 389         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 390         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 391         kfree(tbl.data);
 392
 393         return ret;
 394 }
 395
 396 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 397 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 398                                           void *buffer, size_t *lenp,
 399                                           loff_t *ppos)
 400 {
 401         struct net *net = container_of(table->data, struct net,
 402             ipv4.sysctl_fib_multipath_hash_policy);
 403         int ret;
 404
 405         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 406         if (write && ret == 0)
 407                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 408
 409         return ret;
 410 }
 411 #endif
 412
 413 static struct ctl_table ipv4_table[] = {
 414         {
 415                 .procname       = "tcp_max_orphans",
 416                 .data           = &sysctl_tcp_max_orphans,
 417                 .maxlen         = sizeof(int),
 418                 .mode           = 0644,
 419                 .proc_handler   = proc_dointvec
 420         },
 421         {
 422                 .procname       = "inet_peer_threshold",
 423                 .data           = &inet_peer_threshold,
 424                 .maxlen         = sizeof(int),
 425                 .mode           = 0644,
 426                 .proc_handler   = proc_dointvec
 427         },
 428         {
 429                 .procname       = "inet_peer_minttl",
 430                 .data           = &inet_peer_minttl,
 431                 .maxlen         = sizeof(int),
 432                 .mode           = 0644,
 433                 .proc_handler   = proc_dointvec_jiffies,
 434         },
 435         {
 436                 .procname       = "inet_peer_maxttl",
 437                 .data           = &inet_peer_maxttl,
 438                 .maxlen         = sizeof(int),
 439                 .mode           = 0644,
 440                 .proc_handler   = proc_dointvec_jiffies,
 441         },
 442         {
 443                 .procname       = "tcp_mem",
 444                 .maxlen         = sizeof(sysctl_tcp_mem),
 445                 .data           = &sysctl_tcp_mem,
 446                 .mode           = 0644,
 447                 .proc_handler   = proc_doulongvec_minmax,
 448         },
 449         {
 450                 .procname       = "tcp_low_latency",
 451                 .data           = &sysctl_tcp_low_latency,
 452                 .maxlen         = sizeof(int),
 453                 .mode           = 0644,
 454                 .proc_handler   = proc_dointvec
 455         },
 456 #ifdef CONFIG_NETLABEL
 457         {
 458                 .procname       = "cipso_cache_enable",
 459                 .data           = &cipso_v4_cache_enabled,
 460                 .maxlen         = sizeof(int),
 461                 .mode           = 0644,
 462                 .proc_handler   = proc_dointvec,
 463         },
 464         {
 465                 .procname       = "cipso_cache_bucket_size",
 466                 .data           = &cipso_v4_cache_bucketsize,
 467                 .maxlen         = sizeof(int),
 468                 .mode           = 0644,
 469                 .proc_handler   = proc_dointvec,
 470         },
 471         {
 472                 .procname       = "cipso_rbm_optfmt",
 473                 .data           = &cipso_v4_rbm_optfmt,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = proc_dointvec,
 477         },
 478         {
 479                 .procname       = "cipso_rbm_strictvalid",
 480                 .data           = &cipso_v4_rbm_strictvalid,
 481                 .maxlen         = sizeof(int),
 482                 .mode           = 0644,
 483                 .proc_handler   = proc_dointvec,
 484         },
 485 #endif /* CONFIG_NETLABEL */
 486         {
 487                 .procname       = "tcp_available_ulp",
 488                 .maxlen         = TCP_ULP_BUF_MAX,
 489                 .mode           = 0444,
 490                 .proc_handler   = proc_tcp_available_ulp,
 491         },
 492         {
 493                 .procname       = "icmp_msgs_per_sec",
 494                 .data           = &sysctl_icmp_msgs_per_sec,
 495                 .maxlen         = sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = proc_dointvec_minmax,
 498                 .extra1         = SYSCTL_ZERO,
 499         },
 500         {
 501                 .procname       = "icmp_msgs_burst",
 502                 .data           = &sysctl_icmp_msgs_burst,
 503                 .maxlen         = sizeof(int),
 504                 .mode           = 0644,
 505                 .proc_handler   = proc_dointvec_minmax,
 506                 .extra1         = SYSCTL_ZERO,
 507         },
 508         {
 509                 .procname       = "udp_mem",
 510                 .data           = &sysctl_udp_mem,
 511                 .maxlen         = sizeof(sysctl_udp_mem),
 512                 .mode           = 0644,
 513                 .proc_handler   = proc_doulongvec_minmax,
 514         },
 515         {
 516                 .procname       = "fib_sync_mem",
 517                 .data           = &sysctl_fib_sync_mem,
 518                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 519                 .mode           = 0644,
 520                 .proc_handler   = proc_douintvec_minmax,
 521                 .extra1         = &sysctl_fib_sync_mem_min,
 522                 .extra2         = &sysctl_fib_sync_mem_max,
 523         },
 524         {
 525                 .procname       = "tcp_rx_skb_cache",
 526                 .data           = &tcp_rx_skb_cache_key.key,
 527                 .mode           = 0644,
 528                 .proc_handler   = proc_do_static_key,
 529         },
 530         {
 531                 .procname       = "tcp_tx_skb_cache",
 532                 .data           = &tcp_tx_skb_cache_key.key,
 533                 .mode           = 0644,
 534                 .proc_handler   = proc_do_static_key,
 535         },
 536         { }
 537 };
 538
 539 static struct ctl_table ipv4_net_table[] = {
 540         {
 541                 .procname       = "icmp_echo_ignore_all",
 542                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 543                 .maxlen         = sizeof(u8),
 544                 .mode           = 0644,
 545                 .proc_handler   = proc_dou8vec_minmax,
 546         },
 547         {
 548                 .procname       = "icmp_echo_ignore_broadcasts",
 549                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 550                 .maxlen         = sizeof(u8),
 551                 .mode           = 0644,
 552                 .proc_handler   = proc_dou8vec_minmax,
 553         },
 554         {
 555                 .procname       = "icmp_ignore_bogus_error_responses",
 556                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 557                 .maxlen         = sizeof(u8),
 558                 .mode           = 0644,
 559                 .proc_handler   = proc_dou8vec_minmax,
 560         },
 561         {
 562                 .procname       = "icmp_errors_use_inbound_ifaddr",
 563                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 564                 .maxlen         = sizeof(u8),
 565                 .mode           = 0644,
 566                 .proc_handler   = proc_dou8vec_minmax,
 567         },
 568         {
 569                 .procname       = "icmp_ratelimit",
 570                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 571                 .maxlen         = sizeof(int),
 572                 .mode           = 0644,
 573                 .proc_handler   = proc_dointvec_ms_jiffies,
 574         },
 575         {
 576                 .procname       = "icmp_ratemask",
 577                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 578                 .maxlen         = sizeof(int),
 579                 .mode           = 0644,
 580                 .proc_handler   = proc_dointvec
 581         },
 582         {
 583                 .procname       = "ping_group_range",
 584                 .data           = &init_net.ipv4.ping_group_range.range,
 585                 .maxlen         = sizeof(gid_t)*2,
 586                 .mode           = 0644,
 587                 .proc_handler   = ipv4_ping_group_range,
 588         },
 589 #ifdef CONFIG_NET_L3_MASTER_DEV
 590         {
 591                 .procname       = "raw_l3mdev_accept",
 592                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 593                 .maxlen         = sizeof(u8),
 594                 .mode           = 0644,
 595                 .proc_handler   = proc_dou8vec_minmax,
 596                 .extra1         = SYSCTL_ZERO,
 597                 .extra2         = SYSCTL_ONE,
 598         },
 599 #endif
 600         {
 601                 .procname       = "tcp_ecn",
 602                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 603                 .maxlen         = sizeof(u8),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dou8vec_minmax,
 606         },
 607         {
 608                 .procname       = "tcp_ecn_fallback",
 609                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 610                 .maxlen         = sizeof(u8),
 611                 .mode           = 0644,
 612                 .proc_handler   = proc_dou8vec_minmax,
 613         },
 614         {
 615                 .procname       = "ip_dynaddr",
 616                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 617                 .maxlen         = sizeof(u8),
 618                 .mode           = 0644,
 619                 .proc_handler   = proc_dou8vec_minmax,
 620         },
 621         {
 622                 .procname       = "ip_early_demux",
 623                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 624                 .maxlen         = sizeof(u8),
 625                 .mode           = 0644,
 626                 .proc_handler   = proc_dou8vec_minmax,
 627         },
 628         {
 629                 .procname       = "udp_early_demux",
 630                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = proc_douintvec_minmax,
 634         },
 635         {
 636                 .procname       = "tcp_early_demux",
 637                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 638                 .maxlen         = sizeof(int),
 639                 .mode           = 0644,
 640                 .proc_handler   = proc_douintvec_minmax,
 641         },
 642         {
 643                 .procname       = "nexthop_compat_mode",
 644                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 645                 .maxlen         = sizeof(u8),
 646                 .mode           = 0644,
 647                 .proc_handler   = proc_dou8vec_minmax,
 648                 .extra1         = SYSCTL_ZERO,
 649                 .extra2         = SYSCTL_ONE,
 650         },
 651         {
 652                 .procname       = "ip_default_ttl",
 653                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 654                 .maxlen         = sizeof(u8),
 655                 .mode           = 0644,
 656                 .proc_handler   = proc_dou8vec_minmax,
 657                 .extra1         = &ip_ttl_min,
 658                 .extra2         = &ip_ttl_max,
 659         },
 660         {
 661                 .procname       = "ip_local_port_range",
 662                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 663                 .data           = &init_net.ipv4.ip_local_ports.range,
 664                 .mode           = 0644,
 665                 .proc_handler   = ipv4_local_port_range,
 666         },
 667         {
 668                 .procname       = "ip_local_reserved_ports",
 669                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 670                 .maxlen         = 65536,
 671                 .mode           = 0644,
 672                 .proc_handler   = proc_do_large_bitmap,
 673         },
 674         {
 675                 .procname       = "ip_no_pmtu_disc",
 676                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 677                 .maxlen         = sizeof(u8),
 678                 .mode           = 0644,
 679                 .proc_handler   = proc_dou8vec_minmax,
 680         },
 681         {
 682                 .procname       = "ip_forward_use_pmtu",
 683                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 684                 .maxlen         = sizeof(u8),
 685                 .mode           = 0644,
 686                 .proc_handler   = proc_dou8vec_minmax,
 687         },
 688         {
 689                 .procname       = "ip_forward_update_priority",
 690                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 691                 .maxlen         = sizeof(int),
 692                 .mode           = 0644,
 693                 .proc_handler   = ipv4_fwd_update_priority,
 694                 .extra1         = SYSCTL_ZERO,
 695                 .extra2         = SYSCTL_ONE,
 696         },
 697         {
 698                 .procname       = "ip_nonlocal_bind",
 699                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 700                 .maxlen         = sizeof(u8),
 701                 .mode           = 0644,
 702                 .proc_handler   = proc_dou8vec_minmax,
 703         },
 704         {
 705                 .procname       = "ip_autobind_reuse",
 706                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 707                 .maxlen         = sizeof(u8),
 708                 .mode           = 0644,
 709                 .proc_handler   = proc_dou8vec_minmax,
 710                 .extra1         = SYSCTL_ZERO,
 711                 .extra2         = SYSCTL_ONE,
 712         },
 713         {
 714                 .procname       = "fwmark_reflect",
 715                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 716                 .maxlen         = sizeof(u8),
 717                 .mode           = 0644,
 718                 .proc_handler   = proc_dou8vec_minmax,
 719         },
 720         {
 721                 .procname       = "tcp_fwmark_accept",
 722                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 723                 .maxlen         = sizeof(u8),
 724                 .mode           = 0644,
 725                 .proc_handler   = proc_dou8vec_minmax,
 726         },
 727 #ifdef CONFIG_NET_L3_MASTER_DEV
 728         {
 729                 .procname       = "tcp_l3mdev_accept",
 730                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 731                 .maxlen         = sizeof(u8),
 732                 .mode           = 0644,
 733                 .proc_handler   = proc_dou8vec_minmax,
 734                 .extra1         = SYSCTL_ZERO,
 735                 .extra2         = SYSCTL_ONE,
 736         },
 737 #endif
 738         {
 739                 .procname       = "tcp_mtu_probing",
 740                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 741                 .maxlen         = sizeof(u8),
 742                 .mode           = 0644,
 743                 .proc_handler   = proc_dou8vec_minmax,
 744         },
 745         {
 746                 .procname       = "tcp_base_mss",
 747                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 748                 .maxlen         = sizeof(int),
 749                 .mode           = 0644,
 750                 .proc_handler   = proc_dointvec,
 751         },
 752         {
 753                 .procname       = "tcp_min_snd_mss",
 754                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 755                 .maxlen         = sizeof(int),
 756                 .mode           = 0644,
 757                 .proc_handler   = proc_dointvec_minmax,
 758                 .extra1         = &tcp_min_snd_mss_min,
 759                 .extra2         = &tcp_min_snd_mss_max,
 760         },
 761         {
 762                 .procname       = "tcp_mtu_probe_floor",
 763                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 764                 .maxlen         = sizeof(int),
 765                 .mode           = 0644,
 766                 .proc_handler   = proc_dointvec_minmax,
 767                 .extra1         = &tcp_min_snd_mss_min,
 768                 .extra2         = &tcp_min_snd_mss_max,
 769         },
 770         {
 771                 .procname       = "tcp_probe_threshold",
 772                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 773                 .maxlen         = sizeof(int),
 774                 .mode           = 0644,
 775                 .proc_handler   = proc_dointvec,
 776         },
 777         {
 778                 .procname       = "tcp_probe_interval",
 779                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 780                 .maxlen         = sizeof(u32),
 781                 .mode           = 0644,
 782                 .proc_handler   = proc_douintvec_minmax,
 783                 .extra2         = &u32_max_div_HZ,
 784         },
 785         {
 786                 .procname       = "igmp_link_local_mcast_reports",
 787                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 788                 .maxlen         = sizeof(int),
 789                 .mode           = 0644,
 790                 .proc_handler   = proc_dointvec
 791         },
 792         {
 793                 .procname       = "igmp_max_memberships",
 794                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 795                 .maxlen         = sizeof(int),
 796                 .mode           = 0644,
 797                 .proc_handler   = proc_dointvec
 798         },
 799         {
 800                 .procname       = "igmp_max_msf",
 801                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 802                 .maxlen         = sizeof(int),
 803                 .mode           = 0644,
 804                 .proc_handler   = proc_dointvec
 805         },
 806 #ifdef CONFIG_IP_MULTICAST
 807         {
 808                 .procname       = "igmp_qrv",
 809                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 810                 .maxlen         = sizeof(int),
 811                 .mode           = 0644,
 812                 .proc_handler   = proc_dointvec_minmax,
 813                 .extra1         = SYSCTL_ONE
 814         },
 815 #endif
 816         {
 817                 .procname       = "tcp_congestion_control",
 818                 .data           = &init_net.ipv4.tcp_congestion_control,
 819                 .mode           = 0644,
 820                 .maxlen         = TCP_CA_NAME_MAX,
 821                 .proc_handler   = proc_tcp_congestion_control,
 822         },
 823         {
 824                 .procname       = "tcp_available_congestion_control",
 825                 .maxlen         = TCP_CA_BUF_MAX,
 826                 .mode           = 0444,
 827                 .proc_handler   = proc_tcp_available_congestion_control,
 828         },
 829         {
 830                 .procname       = "tcp_allowed_congestion_control",
 831                 .maxlen         = TCP_CA_BUF_MAX,
 832                 .mode           = 0644,
 833                 .proc_handler   = proc_allowed_congestion_control,
 834         },
 835         {
 836                 .procname       = "tcp_keepalive_time",
 837                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 838                 .maxlen         = sizeof(int),
 839                 .mode           = 0644,
 840                 .proc_handler   = proc_dointvec_jiffies,
 841         },
 842         {
 843                 .procname       = "tcp_keepalive_probes",
 844                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 845                 .maxlen         = sizeof(u8),
 846                 .mode           = 0644,
 847                 .proc_handler   = proc_dou8vec_minmax,
 848         },
 849         {
 850                 .procname       = "tcp_keepalive_intvl",
 851                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 852                 .maxlen         = sizeof(int),
 853                 .mode           = 0644,
 854                 .proc_handler   = proc_dointvec_jiffies,
 855         },
 856         {
 857                 .procname       = "tcp_syn_retries",
 858                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 859                 .maxlen         = sizeof(u8),
 860                 .mode           = 0644,
 861                 .proc_handler   = proc_dou8vec_minmax,
 862                 .extra1         = &tcp_syn_retries_min,
 863                 .extra2         = &tcp_syn_retries_max
 864         },
 865         {
 866                 .procname       = "tcp_synack_retries",
 867                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 868                 .maxlen         = sizeof(u8),
 869                 .mode           = 0644,
 870                 .proc_handler   = proc_dou8vec_minmax,
 871         },
 872 #ifdef CONFIG_SYN_COOKIES
 873         {
 874                 .procname       = "tcp_syncookies",
 875                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 876                 .maxlen         = sizeof(u8),
 877                 .mode           = 0644,
 878                 .proc_handler   = proc_dou8vec_minmax,
 879         },
 880 #endif
 881         {
 882                 .procname       = "tcp_migrate_req",
 883                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 884                 .maxlen         = sizeof(u8),
 885                 .mode           = 0644,
 886                 .proc_handler   = proc_dou8vec_minmax,
 887                 .extra1         = SYSCTL_ZERO,
 888                 .extra2         = SYSCTL_ONE
 889         },
 890         {
 891                 .procname       = "tcp_reordering",
 892                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 893                 .maxlen         = sizeof(int),
 894                 .mode           = 0644,
 895                 .proc_handler   = proc_dointvec
 896         },
 897         {
 898                 .procname       = "tcp_retries1",
 899                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 900                 .maxlen         = sizeof(u8),
 901                 .mode           = 0644,
 902                 .proc_handler   = proc_dou8vec_minmax,
 903                 .extra2         = &tcp_retr1_max
 904         },
 905         {
 906                 .procname       = "tcp_retries2",
 907                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 908                 .maxlen         = sizeof(u8),
 909                 .mode           = 0644,
 910                 .proc_handler   = proc_dou8vec_minmax,
 911         },
 912         {
 913                 .procname       = "tcp_orphan_retries",
 914                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 915                 .maxlen         = sizeof(u8),
 916                 .mode           = 0644,
 917                 .proc_handler   = proc_dou8vec_minmax,
 918         },
 919         {
 920                 .procname       = "tcp_fin_timeout",
 921                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 922                 .maxlen         = sizeof(int),
 923                 .mode           = 0644,
 924                 .proc_handler   = proc_dointvec_jiffies,
 925         },
 926         {
 927                 .procname       = "tcp_notsent_lowat",
 928                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
 929                 .maxlen         = sizeof(unsigned int),
 930                 .mode           = 0644,
 931                 .proc_handler   = proc_douintvec,
 932         },
 933         {
 934                 .procname       = "tcp_tw_reuse",
 935                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
 936                 .maxlen         = sizeof(u8),
 937                 .mode           = 0644,
 938                 .proc_handler   = proc_dou8vec_minmax,
 939                 .extra1         = SYSCTL_ZERO,
 940                 .extra2         = &two,
 941         },
 942         {
 943                 .procname       = "tcp_max_tw_buckets",
 944                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 945                 .maxlen         = sizeof(int),
 946                 .mode           = 0644,
 947                 .proc_handler   = proc_dointvec
 948         },
 949         {
 950                 .procname       = "tcp_max_syn_backlog",
 951                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
 952                 .maxlen         = sizeof(int),
 953                 .mode           = 0644,
 954                 .proc_handler   = proc_dointvec
 955         },
 956         {
 957                 .procname       = "tcp_fastopen",
 958                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 959                 .maxlen         = sizeof(int),
 960                 .mode           = 0644,
 961                 .proc_handler   = proc_dointvec,
 962         },
 963         {
 964                 .procname       = "tcp_fastopen_key",
 965                 .mode           = 0600,
 966                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
 967                 /* maxlen to print the list of keys in hex (*2), with dashes
 968                  * separating doublewords and a comma in between keys.
 969                  */
 970                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
 971                                    2 * TCP_FASTOPEN_KEY_MAX) +
 972                                    (TCP_FASTOPEN_KEY_MAX * 5)),
 973                 .proc_handler   = proc_tcp_fastopen_key,
 974         },
 975         {
 976                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
 977                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
 978                 .maxlen         = sizeof(int),
 979                 .mode           = 0644,
 980                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
 981                 .extra1         = SYSCTL_ZERO,
 982         },
 983 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 984         {
 985                 .procname       = "fib_multipath_use_neigh",
 986                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
 987                 .maxlen         = sizeof(int),
 988                 .mode           = 0644,
 989                 .proc_handler   = proc_dointvec_minmax,
 990                 .extra1         = SYSCTL_ZERO,
 991                 .extra2         = SYSCTL_ONE,
 992         },
 993         {
 994                 .procname       = "fib_multipath_hash_policy",
 995                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
 996                 .maxlen         = sizeof(int),
 997                 .mode           = 0644,
 998                 .proc_handler   = proc_fib_multipath_hash_policy,
 999                 .extra1         = SYSCTL_ZERO,
1000                 .extra2         = &two,
1001         },
1002 #endif
1003         {
1004                 .procname       = "ip_unprivileged_port_start",
1005                 .maxlen         = sizeof(int),
1006                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1007                 .mode           = 0644,
1008                 .proc_handler   = ipv4_privileged_ports,
1009         },
1010 #ifdef CONFIG_NET_L3_MASTER_DEV
1011         {
1012                 .procname       = "udp_l3mdev_accept",
1013                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1014                 .maxlen         = sizeof(int),
1015                 .mode           = 0644,
1016                 .proc_handler   = proc_dointvec_minmax,
1017                 .extra1         = SYSCTL_ZERO,
1018                 .extra2         = SYSCTL_ONE,
1019         },
1020 #endif
1021         {
1022                 .procname       = "tcp_sack",
1023                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1024                 .maxlen         = sizeof(u8),
1025                 .mode           = 0644,
1026                 .proc_handler   = proc_dou8vec_minmax,
1027         },
1028         {
1029                 .procname       = "tcp_window_scaling",
1030                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1031                 .maxlen         = sizeof(u8),
1032                 .mode           = 0644,
1033                 .proc_handler   = proc_dou8vec_minmax,
1034         },
1035         {
1036                 .procname       = "tcp_timestamps",
1037                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1038                 .maxlen         = sizeof(u8),
1039                 .mode           = 0644,
1040                 .proc_handler   = proc_dou8vec_minmax,
1041         },
1042         {
1043                 .procname       = "tcp_early_retrans",
1044                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1045                 .maxlen         = sizeof(u8),
1046                 .mode           = 0644,
1047                 .proc_handler   = proc_dou8vec_minmax,
1048                 .extra1         = SYSCTL_ZERO,
1049                 .extra2         = &four,
1050         },
1051         {
1052                 .procname       = "tcp_recovery",
1053                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1054                 .maxlen         = sizeof(u8),
1055                 .mode           = 0644,
1056                 .proc_handler   = proc_dou8vec_minmax,
1057         },
1058         {
1059                 .procname       = "tcp_thin_linear_timeouts",
1060                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1061                 .maxlen         = sizeof(u8),
1062                 .mode           = 0644,
1063                 .proc_handler   = proc_dou8vec_minmax,
1064         },
1065         {
1066                 .procname       = "tcp_slow_start_after_idle",
1067                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1068                 .maxlen         = sizeof(u8),
1069                 .mode           = 0644,
1070                 .proc_handler   = proc_dou8vec_minmax,
1071         },
1072         {
1073                 .procname       = "tcp_retrans_collapse",
1074                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1075                 .maxlen         = sizeof(u8),
1076                 .mode           = 0644,
1077                 .proc_handler   = proc_dou8vec_minmax,
1078         },
1079         {
1080                 .procname       = "tcp_stdurg",
1081                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1082                 .maxlen         = sizeof(u8),
1083                 .mode           = 0644,
1084                 .proc_handler   = proc_dou8vec_minmax,
1085         },
1086         {
1087                 .procname       = "tcp_rfc1337",
1088                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1089                 .maxlen         = sizeof(u8),
1090                 .mode           = 0644,
1091                 .proc_handler   = proc_dou8vec_minmax,
1092         },
1093         {
1094                 .procname       = "tcp_abort_on_overflow",
1095                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1096                 .maxlen         = sizeof(u8),
1097                 .mode           = 0644,
1098                 .proc_handler   = proc_dou8vec_minmax,
1099         },
1100         {
1101                 .procname       = "tcp_fack",
1102                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1103                 .maxlen         = sizeof(u8),
1104                 .mode           = 0644,
1105                 .proc_handler   = proc_dou8vec_minmax,
1106         },
1107         {
1108                 .procname       = "tcp_max_reordering",
1109                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1110                 .maxlen         = sizeof(int),
1111                 .mode           = 0644,
1112                 .proc_handler   = proc_dointvec
1113         },
1114         {
1115                 .procname       = "tcp_dsack",
1116                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1117                 .maxlen         = sizeof(u8),
1118                 .mode           = 0644,
1119                 .proc_handler   = proc_dou8vec_minmax,
1120         },
1121         {
1122                 .procname       = "tcp_app_win",
1123                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1124                 .maxlen         = sizeof(u8),
1125                 .mode           = 0644,
1126                 .proc_handler   = proc_dou8vec_minmax,
1127                 .extra1         = SYSCTL_ZERO,
1128                 .extra2         = &tcp_app_win_max,
1129         },
1130         {
1131                 .procname       = "tcp_adv_win_scale",
1132                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1133                 .maxlen         = sizeof(int),
1134                 .mode           = 0644,
1135                 .proc_handler   = proc_dointvec_minmax,
1136                 .extra1         = &tcp_adv_win_scale_min,
1137                 .extra2         = &tcp_adv_win_scale_max,
1138         },
1139         {
1140                 .procname       = "tcp_frto",
1141                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1142                 .maxlen         = sizeof(u8),
1143                 .mode           = 0644,
1144                 .proc_handler   = proc_dou8vec_minmax,
1145         },
1146         {
1147                 .procname       = "tcp_no_metrics_save",
1148                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1149                 .maxlen         = sizeof(u8),
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dou8vec_minmax,
1152         },
1153         {
1154                 .procname       = "tcp_no_ssthresh_metrics_save",
1155                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1156                 .maxlen         = sizeof(u8),
1157                 .mode           = 0644,
1158                 .proc_handler   = proc_dou8vec_minmax,
1159                 .extra1         = SYSCTL_ZERO,
1160                 .extra2         = SYSCTL_ONE,
1161         },
1162         {
1163                 .procname       = "tcp_moderate_rcvbuf",
1164                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1165                 .maxlen         = sizeof(u8),
1166                 .mode           = 0644,
1167                 .proc_handler   = proc_dou8vec_minmax,
1168         },
1169         {
1170                 .procname       = "tcp_tso_win_divisor",
1171                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1172                 .maxlen         = sizeof(u8),
1173                 .mode           = 0644,
1174                 .proc_handler   = proc_dou8vec_minmax,
1175         },
1176         {
1177                 .procname       = "tcp_workaround_signed_windows",
1178                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1179                 .maxlen         = sizeof(u8),
1180                 .mode           = 0644,
1181                 .proc_handler   = proc_dou8vec_minmax,
1182         },
1183         {
1184                 .procname       = "tcp_limit_output_bytes",
1185                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1186                 .maxlen         = sizeof(int),
1187                 .mode           = 0644,
1188                 .proc_handler   = proc_dointvec
1189         },
1190         {
1191                 .procname       = "tcp_challenge_ack_limit",
1192                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1193                 .maxlen         = sizeof(int),
1194                 .mode           = 0644,
1195                 .proc_handler   = proc_dointvec
1196         },
1197         {
1198                 .procname       = "tcp_min_tso_segs",
1199                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1200                 .maxlen         = sizeof(u8),
1201                 .mode           = 0644,
1202                 .proc_handler   = proc_dou8vec_minmax,
1203                 .extra1         = SYSCTL_ONE,
1204         },
1205         {
1206                 .procname       = "tcp_min_rtt_wlen",
1207                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1208                 .maxlen         = sizeof(int),
1209                 .mode           = 0644,
1210                 .proc_handler   = proc_dointvec_minmax,
1211                 .extra1         = SYSCTL_ZERO,
1212                 .extra2         = &one_day_secs
1213         },
1214         {
1215                 .procname       = "tcp_autocorking",
1216                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1217                 .maxlen         = sizeof(u8),
1218                 .mode           = 0644,
1219                 .proc_handler   = proc_dou8vec_minmax,
1220                 .extra1         = SYSCTL_ZERO,
1221                 .extra2         = SYSCTL_ONE,
1222         },
1223         {
1224                 .procname       = "tcp_invalid_ratelimit",
1225                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1226                 .maxlen         = sizeof(int),
1227                 .mode           = 0644,
1228                 .proc_handler   = proc_dointvec_ms_jiffies,
1229         },
1230         {
1231                 .procname       = "tcp_pacing_ss_ratio",
1232                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1233                 .maxlen         = sizeof(int),
1234                 .mode           = 0644,
1235                 .proc_handler   = proc_dointvec_minmax,
1236                 .extra1         = SYSCTL_ZERO,
1237                 .extra2         = &thousand,
1238         },
1239         {
1240                 .procname       = "tcp_pacing_ca_ratio",
1241                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1242                 .maxlen         = sizeof(int),
1243                 .mode           = 0644,
1244                 .proc_handler   = proc_dointvec_minmax,
1245                 .extra1         = SYSCTL_ZERO,
1246                 .extra2         = &thousand,
1247         },
1248         {
1249                 .procname       = "tcp_wmem",
1250                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1251                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1252                 .mode           = 0644,
1253                 .proc_handler   = proc_dointvec_minmax,
1254                 .extra1         = SYSCTL_ONE,
1255         },
1256         {
1257                 .procname       = "tcp_rmem",
1258                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1259                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1260                 .mode           = 0644,
1261                 .proc_handler   = proc_dointvec_minmax,
1262                 .extra1         = SYSCTL_ONE,
1263         },
1264         {
1265                 .procname       = "tcp_comp_sack_delay_ns",
1266                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1267                 .maxlen         = sizeof(unsigned long),
1268                 .mode           = 0644,
1269                 .proc_handler   = proc_doulongvec_minmax,
1270         },
1271         {
1272                 .procname       = "tcp_comp_sack_slack_ns",
1273                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1274                 .maxlen         = sizeof(unsigned long),
1275                 .mode           = 0644,
1276                 .proc_handler   = proc_doulongvec_minmax,
1277         },
1278         {
1279                 .procname       = "tcp_comp_sack_nr",
1280                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1281                 .maxlen         = sizeof(int),
1282                 .mode           = 0644,
1283                 .proc_handler   = proc_dointvec_minmax,
1284                 .extra1         = SYSCTL_ZERO,
1285                 .extra2         = &comp_sack_nr_max,
1286         },
1287         {
1288                 .procname       = "tcp_reflect_tos",
1289                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1290                 .maxlen         = sizeof(u8),
1291                 .mode           = 0644,
1292                 .proc_handler   = proc_dou8vec_minmax,
1293                 .extra1         = SYSCTL_ZERO,
1294                 .extra2         = SYSCTL_ONE,
1295         },
1296         {
1297                 .procname       = "udp_rmem_min",
1298                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1299                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1300                 .mode           = 0644,
1301                 .proc_handler   = proc_dointvec_minmax,
1302                 .extra1         = SYSCTL_ONE
1303         },
1304         {
1305                 .procname       = "udp_wmem_min",
1306                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1307                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1308                 .mode           = 0644,
1309                 .proc_handler   = proc_dointvec_minmax,
1310                 .extra1         = SYSCTL_ONE
1311         },
1312         { }
1313 };
1314
1315 static __net_init int ipv4_sysctl_init_net(struct net *net)
1316 {
1317         struct ctl_table *table;
1318
1319         table = ipv4_net_table;
1320         if (!net_eq(net, &init_net)) {
1321                 int i;
1322
1323                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1324                 if (!table)
1325                         goto err_alloc;
1326
1327                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1328                         if (table[i].data) {
1329                                 /* Update the variables to point into
1330                                  * the current struct net
1331                                  */
1332                                 table[i].data += (void *)net - (void *)&init_net;
1333                         } else {
1334                                 /* Entries without data pointer are global;
1335                                  * Make them read-only in non-init_net ns
1336                                  */
1337                                 table[i].mode &= ~0222;
1338                         }
1339                 }
1340         }
1341
1342         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1343         if (!net->ipv4.ipv4_hdr)
1344                 goto err_reg;
1345
1346         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1347         if (!net->ipv4.sysctl_local_reserved_ports)
1348                 goto err_ports;
1349
1350         return 0;
1351
1352 err_ports:
1353         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1354 err_reg:
1355         if (!net_eq(net, &init_net))
1356                 kfree(table);
1357 err_alloc:
1358         return -ENOMEM;
1359 }
1360
1361 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1362 {
1363         struct ctl_table *table;
1364
1365         kfree(net->ipv4.sysctl_local_reserved_ports);
1366         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1367         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1368         kfree(table);
1369 }
1370
1371 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1372         .init = ipv4_sysctl_init_net,
1373         .exit = ipv4_sysctl_exit_net,
1374 };
1375
1376 static __init int sysctl_ipv4_init(void)
1377 {
1378         struct ctl_table_header *hdr;
1379
1380         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1381         if (!hdr)
1382                 return -ENOMEM;
1383
1384         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1385                 unregister_net_sysctl_table(hdr);
1386                 return -ENOMEM;
1387         }
1388
1389         return 0;
1390 }
1391
1392 __initcall(sysctl_ipv4_init);