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/sysctl.h>
  10 #include <linux/seqlock.h>
  11 #include <linux/init.h>
  12 #include <linux/slab.h>
  13 #include <net/icmp.h>
  14 #include <net/ip.h>
  15 #include <net/ip_fib.h>
  16 #include <net/tcp.h>
  17 #include <net/udp.h>
  18 #include <net/cipso_ipv4.h>
  19 #include <net/ping.h>
  20 #include <net/protocol.h>
  21 #include <net/netevent.h>
  22
  23 static int tcp_retr1_max = 255;
  24 static int ip_local_port_range_min[] = { 1, 1 };
  25 static int ip_local_port_range_max[] = { 65535, 65535 };
  26 static int tcp_adv_win_scale_min = -31;
  27 static int tcp_adv_win_scale_max = 31;
  28 static int tcp_app_win_max = 31;
  29 static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
  30 static int tcp_min_snd_mss_max = 65535;
  31 static int ip_privileged_port_min;
  32 static int ip_privileged_port_max = 65535;
  33 static int ip_ttl_min = 1;
  34 static int ip_ttl_max = 255;
  35 static int tcp_syn_retries_min = 1;
  36 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  37 static unsigned long ip_ping_group_range_min[] = { 0, 0 };
  38 static unsigned long ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  39 static u32 u32_max_div_HZ = UINT_MAX / HZ;
  40 static int one_day_secs = 24 * 3600;
  41 static u32 fib_multipath_hash_fields_all_mask __maybe_unused =
  42         FIB_MULTIPATH_HASH_FIELD_ALL_MASK;
  43 static unsigned int tcp_child_ehash_entries_max = 16 * 1024 * 1024;
  44 static unsigned int udp_child_hash_entries_max = UDP_HTABLE_SIZE_MAX;
  45 static int tcp_plb_max_rounds = 31;
  46 static int tcp_plb_max_cong_thresh = 256;
  47
  48 /* obsolete */
  49 static int sysctl_tcp_low_latency __read_mostly;
  50
  51 /* Update system visible IP port range */
  52 static void set_local_port_range(struct net *net, int range[2])
  53 {
  54         bool same_parity = !((range[0] ^ range[1]) & 1);
  55
  56         write_seqlock_bh(&net->ipv4.ip_local_ports.lock);
  57         if (same_parity && !net->ipv4.ip_local_ports.warned) {
  58                 net->ipv4.ip_local_ports.warned = true;
  59                 pr_err_ratelimited("ip_local_port_range: prefer different parity for start/end values.\n");
  60         }
  61         net->ipv4.ip_local_ports.range[0] = range[0];
  62         net->ipv4.ip_local_ports.range[1] = range[1];
  63         write_sequnlock_bh(&net->ipv4.ip_local_ports.lock);
  64 }
  65
  66 /* Validate changes from /proc interface. */
  67 static int ipv4_local_port_range(struct ctl_table *table, int write,
  68                                  void *buffer, size_t *lenp, loff_t *ppos)
  69 {
  70         struct net *net =
  71                 container_of(table->data, struct net, ipv4.ip_local_ports.range);
  72         int ret;
  73         int range[2];
  74         struct ctl_table tmp = {
  75                 .data = &range,
  76                 .maxlen = sizeof(range),
  77                 .mode = table->mode,
  78                 .extra1 = &ip_local_port_range_min,
  79                 .extra2 = &ip_local_port_range_max,
  80         };
  81
  82         inet_get_local_port_range(net, &range[0], &range[1]);
  83
  84         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  85
  86         if (write && ret == 0) {
  87                 /* Ensure that the upper limit is not smaller than the lower,
  88                  * and that the lower does not encroach upon the privileged
  89                  * port limit.
  90                  */
  91                 if ((range[1] < range[0]) ||
  92                     (range[0] < READ_ONCE(net->ipv4.sysctl_ip_prot_sock)))
  93                         ret = -EINVAL;
  94                 else
  95                         set_local_port_range(net, range);
  96         }
  97
  98         return ret;
  99 }
 100
 101 /* Validate changes from /proc interface. */
 102 static int ipv4_privileged_ports(struct ctl_table *table, int write,
 103                                 void *buffer, size_t *lenp, loff_t *ppos)
 104 {
 105         struct net *net = container_of(table->data, struct net,
 106             ipv4.sysctl_ip_prot_sock);
 107         int ret;
 108         int pports;
 109         int range[2];
 110         struct ctl_table tmp = {
 111                 .data = &pports,
 112                 .maxlen = sizeof(pports),
 113                 .mode = table->mode,
 114                 .extra1 = &ip_privileged_port_min,
 115                 .extra2 = &ip_privileged_port_max,
 116         };
 117
 118         pports = READ_ONCE(net->ipv4.sysctl_ip_prot_sock);
 119
 120         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 121
 122         if (write && ret == 0) {
 123                 inet_get_local_port_range(net, &range[0], &range[1]);
 124                 /* Ensure that the local port range doesn't overlap with the
 125                  * privileged port range.
 126                  */
 127                 if (range[0] < pports)
 128                         ret = -EINVAL;
 129                 else
 130                         WRITE_ONCE(net->ipv4.sysctl_ip_prot_sock, pports);
 131         }
 132
 133         return ret;
 134 }
 135
 136 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
 137 {
 138         kgid_t *data = table->data;
 139         struct net *net =
 140                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 141         unsigned int seq;
 142         do {
 143                 seq = read_seqbegin(&net->ipv4.ping_group_range.lock);
 144
 145                 *low = data[0];
 146                 *high = data[1];
 147         } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq));
 148 }
 149
 150 /* Update system visible IP port range */
 151 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 152 {
 153         kgid_t *data = table->data;
 154         struct net *net =
 155                 container_of(table->data, struct net, ipv4.ping_group_range.range);
 156         write_seqlock(&net->ipv4.ping_group_range.lock);
 157         data[0] = low;
 158         data[1] = high;
 159         write_sequnlock(&net->ipv4.ping_group_range.lock);
 160 }
 161
 162 /* Validate changes from /proc interface. */
 163 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 164                                  void *buffer, size_t *lenp, loff_t *ppos)
 165 {
 166         struct user_namespace *user_ns = current_user_ns();
 167         int ret;
 168         unsigned long urange[2];
 169         kgid_t low, high;
 170         struct ctl_table tmp = {
 171                 .data = &urange,
 172                 .maxlen = sizeof(urange),
 173                 .mode = table->mode,
 174                 .extra1 = &ip_ping_group_range_min,
 175                 .extra2 = &ip_ping_group_range_max,
 176         };
 177
 178         inet_get_ping_group_range_table(table, &low, &high);
 179         urange[0] = from_kgid_munged(user_ns, low);
 180         urange[1] = from_kgid_munged(user_ns, high);
 181         ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
 182
 183         if (write && ret == 0) {
 184                 low = make_kgid(user_ns, urange[0]);
 185                 high = make_kgid(user_ns, urange[1]);
 186                 if (!gid_valid(low) || !gid_valid(high))
 187                         return -EINVAL;
 188                 if (urange[1] < urange[0] || gid_lt(high, low)) {
 189                         low = make_kgid(&init_user_ns, 1);
 190                         high = make_kgid(&init_user_ns, 0);
 191                 }
 192                 set_ping_group_range(table, low, high);
 193         }
 194
 195         return ret;
 196 }
 197
 198 static int ipv4_fwd_update_priority(struct ctl_table *table, int write,
 199                                     void *buffer, size_t *lenp, loff_t *ppos)
 200 {
 201         struct net *net;
 202         int ret;
 203
 204         net = container_of(table->data, struct net,
 205                            ipv4.sysctl_ip_fwd_update_priority);
 206         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 207         if (write && ret == 0)
 208                 call_netevent_notifiers(NETEVENT_IPV4_FWD_UPDATE_PRIORITY_UPDATE,
 209                                         net);
 210
 211         return ret;
 212 }
 213
 214 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 215                                        void *buffer, size_t *lenp, loff_t *ppos)
 216 {
 217         struct net *net = container_of(ctl->data, struct net,
 218                                        ipv4.tcp_congestion_control);
 219         char val[TCP_CA_NAME_MAX];
 220         struct ctl_table tbl = {
 221                 .data = val,
 222                 .maxlen = TCP_CA_NAME_MAX,
 223         };
 224         int ret;
 225
 226         tcp_get_default_congestion_control(net, val);
 227
 228         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 229         if (write && ret == 0)
 230                 ret = tcp_set_default_congestion_control(net, val);
 231         return ret;
 232 }
 233
 234 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 235                                                  int write, void *buffer,
 236                                                  size_t *lenp, loff_t *ppos)
 237 {
 238         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 239         int ret;
 240
 241         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 242         if (!tbl.data)
 243                 return -ENOMEM;
 244         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 245         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 246         kfree(tbl.data);
 247         return ret;
 248 }
 249
 250 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 251                                            int write, void *buffer,
 252                                            size_t *lenp, loff_t *ppos)
 253 {
 254         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 255         int ret;
 256
 257         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 258         if (!tbl.data)
 259                 return -ENOMEM;
 260
 261         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 262         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 263         if (write && ret == 0)
 264                 ret = tcp_set_allowed_congestion_control(tbl.data);
 265         kfree(tbl.data);
 266         return ret;
 267 }
 268
 269 static int sscanf_key(char *buf, __le32 *key)
 270 {
 271         u32 user_key[4];
 272         int i, ret = 0;
 273
 274         if (sscanf(buf, "%x-%x-%x-%x", user_key, user_key + 1,
 275                    user_key + 2, user_key + 3) != 4) {
 276                 ret = -EINVAL;
 277         } else {
 278                 for (i = 0; i < ARRAY_SIZE(user_key); i++)
 279                         key[i] = cpu_to_le32(user_key[i]);
 280         }
 281         pr_debug("proc TFO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 282                  user_key[0], user_key[1], user_key[2], user_key[3], buf, ret);
 283
 284         return ret;
 285 }
 286
 287 static int proc_tcp_fastopen_key(struct ctl_table *table, int write,
 288                                  void *buffer, size_t *lenp, loff_t *ppos)
 289 {
 290         struct net *net = container_of(table->data, struct net,
 291             ipv4.sysctl_tcp_fastopen);
 292         /* maxlen to print the list of keys in hex (*2), with dashes
 293          * separating doublewords and a comma in between keys.
 294          */
 295         struct ctl_table tbl = { .maxlen = ((TCP_FASTOPEN_KEY_LENGTH *
 296                                             2 * TCP_FASTOPEN_KEY_MAX) +
 297                                             (TCP_FASTOPEN_KEY_MAX * 5)) };
 298         u32 user_key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(u32)];
 299         __le32 key[TCP_FASTOPEN_KEY_BUF_LENGTH / sizeof(__le32)];
 300         char *backup_data;
 301         int ret, i = 0, off = 0, n_keys;
 302
 303         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 304         if (!tbl.data)
 305                 return -ENOMEM;
 306
 307         n_keys = tcp_fastopen_get_cipher(net, NULL, (u64 *)key);
 308         if (!n_keys) {
 309                 memset(&key[0], 0, TCP_FASTOPEN_KEY_LENGTH);
 310                 n_keys = 1;
 311         }
 312
 313         for (i = 0; i < n_keys * 4; i++)
 314                 user_key[i] = le32_to_cpu(key[i]);
 315
 316         for (i = 0; i < n_keys; i++) {
 317                 off += snprintf(tbl.data + off, tbl.maxlen - off,
 318                                 "%08x-%08x-%08x-%08x",
 319                                 user_key[i * 4],
 320                                 user_key[i * 4 + 1],
 321                                 user_key[i * 4 + 2],
 322                                 user_key[i * 4 + 3]);
 323
 324                 if (WARN_ON_ONCE(off >= tbl.maxlen - 1))
 325                         break;
 326
 327                 if (i + 1 < n_keys)
 328                         off += snprintf(tbl.data + off, tbl.maxlen - off, ",");
 329         }
 330
 331         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 332
 333         if (write && ret == 0) {
 334                 backup_data = strchr(tbl.data, ',');
 335                 if (backup_data) {
 336                         *backup_data = '\0';
 337                         backup_data++;
 338                 }
 339                 if (sscanf_key(tbl.data, key)) {
 340                         ret = -EINVAL;
 341                         goto bad_key;
 342                 }
 343                 if (backup_data) {
 344                         if (sscanf_key(backup_data, key + 4)) {
 345                                 ret = -EINVAL;
 346                                 goto bad_key;
 347                         }
 348                 }
 349                 tcp_fastopen_reset_cipher(net, NULL, key,
 350                                           backup_data ? key + 4 : NULL);
 351         }
 352
 353 bad_key:
 354         kfree(tbl.data);
 355         return ret;
 356 }
 357
 358 static int proc_tfo_blackhole_detect_timeout(struct ctl_table *table,
 359                                              int write, void *buffer,
 360                                              size_t *lenp, loff_t *ppos)
 361 {
 362         struct net *net = container_of(table->data, struct net,
 363             ipv4.sysctl_tcp_fastopen_blackhole_timeout);
 364         int ret;
 365
 366         ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
 367         if (write && ret == 0)
 368                 atomic_set(&net->ipv4.tfo_active_disable_times, 0);
 369
 370         return ret;
 371 }
 372
 373 static int proc_tcp_available_ulp(struct ctl_table *ctl,
 374                                   int write, void *buffer, size_t *lenp,
 375                                   loff_t *ppos)
 376 {
 377         struct ctl_table tbl = { .maxlen = TCP_ULP_BUF_MAX, };
 378         int ret;
 379
 380         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 381         if (!tbl.data)
 382                 return -ENOMEM;
 383         tcp_get_available_ulp(tbl.data, TCP_ULP_BUF_MAX);
 384         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 385         kfree(tbl.data);
 386
 387         return ret;
 388 }
 389
 390 static int proc_tcp_ehash_entries(struct ctl_table *table, int write,
 391                                   void *buffer, size_t *lenp, loff_t *ppos)
 392 {
 393         struct net *net = container_of(table->data, struct net,
 394                                        ipv4.sysctl_tcp_child_ehash_entries);
 395         struct inet_hashinfo *hinfo = net->ipv4.tcp_death_row.hashinfo;
 396         int tcp_ehash_entries;
 397         struct ctl_table tbl;
 398
 399         tcp_ehash_entries = hinfo->ehash_mask + 1;
 400
 401         /* A negative number indicates that the child netns
 402          * shares the global ehash.
 403          */
 404         if (!net_eq(net, &init_net) && !hinfo->pernet)
 405                 tcp_ehash_entries *= -1;
 406
 407         memset(&tbl, 0, sizeof(tbl));
 408         tbl.data = &tcp_ehash_entries;
 409         tbl.maxlen = sizeof(int);
 410
 411         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
 412 }
 413
 414 static int proc_udp_hash_entries(struct ctl_table *table, int write,
 415                                  void *buffer, size_t *lenp, loff_t *ppos)
 416 {
 417         struct net *net = container_of(table->data, struct net,
 418                                        ipv4.sysctl_udp_child_hash_entries);
 419         int udp_hash_entries;
 420         struct ctl_table tbl;
 421
 422         udp_hash_entries = net->ipv4.udp_table->mask + 1;
 423
 424         /* A negative number indicates that the child netns
 425          * shares the global udp_table.
 426          */
 427         if (!net_eq(net, &init_net) && net->ipv4.udp_table == &udp_table)
 428                 udp_hash_entries *= -1;
 429
 430         memset(&tbl, 0, sizeof(tbl));
 431         tbl.data = &udp_hash_entries;
 432         tbl.maxlen = sizeof(int);
 433
 434         return proc_dointvec(&tbl, write, buffer, lenp, ppos);
 435 }
 436
 437 #ifdef CONFIG_IP_ROUTE_MULTIPATH
 438 static int proc_fib_multipath_hash_policy(struct ctl_table *table, int write,
 439                                           void *buffer, size_t *lenp,
 440                                           loff_t *ppos)
 441 {
 442         struct net *net = container_of(table->data, struct net,
 443             ipv4.sysctl_fib_multipath_hash_policy);
 444         int ret;
 445
 446         ret = proc_dou8vec_minmax(table, write, buffer, lenp, ppos);
 447         if (write && ret == 0)
 448                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 449
 450         return ret;
 451 }
 452
 453 static int proc_fib_multipath_hash_fields(struct ctl_table *table, int write,
 454                                           void *buffer, size_t *lenp,
 455                                           loff_t *ppos)
 456 {
 457         struct net *net;
 458         int ret;
 459
 460         net = container_of(table->data, struct net,
 461                            ipv4.sysctl_fib_multipath_hash_fields);
 462         ret = proc_douintvec_minmax(table, write, buffer, lenp, ppos);
 463         if (write && ret == 0)
 464                 call_netevent_notifiers(NETEVENT_IPV4_MPATH_HASH_UPDATE, net);
 465
 466         return ret;
 467 }
 468 #endif
 469
 470 static struct ctl_table ipv4_table[] = {
 471         {
 472                 .procname       = "tcp_max_orphans",
 473                 .data           = &sysctl_tcp_max_orphans,
 474                 .maxlen         = sizeof(int),
 475                 .mode           = 0644,
 476                 .proc_handler   = proc_dointvec
 477         },
 478         {
 479                 .procname       = "inet_peer_threshold",
 480                 .data           = &inet_peer_threshold,
 481                 .maxlen         = sizeof(int),
 482                 .mode           = 0644,
 483                 .proc_handler   = proc_dointvec
 484         },
 485         {
 486                 .procname       = "inet_peer_minttl",
 487                 .data           = &inet_peer_minttl,
 488                 .maxlen         = sizeof(int),
 489                 .mode           = 0644,
 490                 .proc_handler   = proc_dointvec_jiffies,
 491         },
 492         {
 493                 .procname       = "inet_peer_maxttl",
 494                 .data           = &inet_peer_maxttl,
 495                 .maxlen         = sizeof(int),
 496                 .mode           = 0644,
 497                 .proc_handler   = proc_dointvec_jiffies,
 498         },
 499         {
 500                 .procname       = "tcp_mem",
 501                 .maxlen         = sizeof(sysctl_tcp_mem),
 502                 .data           = &sysctl_tcp_mem,
 503                 .mode           = 0644,
 504                 .proc_handler   = proc_doulongvec_minmax,
 505         },
 506         {
 507                 .procname       = "tcp_low_latency",
 508                 .data           = &sysctl_tcp_low_latency,
 509                 .maxlen         = sizeof(int),
 510                 .mode           = 0644,
 511                 .proc_handler   = proc_dointvec
 512         },
 513 #ifdef CONFIG_NETLABEL
 514         {
 515                 .procname       = "cipso_cache_enable",
 516                 .data           = &cipso_v4_cache_enabled,
 517                 .maxlen         = sizeof(int),
 518                 .mode           = 0644,
 519                 .proc_handler   = proc_dointvec,
 520         },
 521         {
 522                 .procname       = "cipso_cache_bucket_size",
 523                 .data           = &cipso_v4_cache_bucketsize,
 524                 .maxlen         = sizeof(int),
 525                 .mode           = 0644,
 526                 .proc_handler   = proc_dointvec,
 527         },
 528         {
 529                 .procname       = "cipso_rbm_optfmt",
 530                 .data           = &cipso_v4_rbm_optfmt,
 531                 .maxlen         = sizeof(int),
 532                 .mode           = 0644,
 533                 .proc_handler   = proc_dointvec,
 534         },
 535         {
 536                 .procname       = "cipso_rbm_strictvalid",
 537                 .data           = &cipso_v4_rbm_strictvalid,
 538                 .maxlen         = sizeof(int),
 539                 .mode           = 0644,
 540                 .proc_handler   = proc_dointvec,
 541         },
 542 #endif /* CONFIG_NETLABEL */
 543         {
 544                 .procname       = "tcp_available_ulp",
 545                 .maxlen         = TCP_ULP_BUF_MAX,
 546                 .mode           = 0444,
 547                 .proc_handler   = proc_tcp_available_ulp,
 548         },
 549         {
 550                 .procname       = "icmp_msgs_per_sec",
 551                 .data           = &sysctl_icmp_msgs_per_sec,
 552                 .maxlen         = sizeof(int),
 553                 .mode           = 0644,
 554                 .proc_handler   = proc_dointvec_minmax,
 555                 .extra1         = SYSCTL_ZERO,
 556         },
 557         {
 558                 .procname       = "icmp_msgs_burst",
 559                 .data           = &sysctl_icmp_msgs_burst,
 560                 .maxlen         = sizeof(int),
 561                 .mode           = 0644,
 562                 .proc_handler   = proc_dointvec_minmax,
 563                 .extra1         = SYSCTL_ZERO,
 564         },
 565         {
 566                 .procname       = "udp_mem",
 567                 .data           = &sysctl_udp_mem,
 568                 .maxlen         = sizeof(sysctl_udp_mem),
 569                 .mode           = 0644,
 570                 .proc_handler   = proc_doulongvec_minmax,
 571         },
 572         {
 573                 .procname       = "fib_sync_mem",
 574                 .data           = &sysctl_fib_sync_mem,
 575                 .maxlen         = sizeof(sysctl_fib_sync_mem),
 576                 .mode           = 0644,
 577                 .proc_handler   = proc_douintvec_minmax,
 578                 .extra1         = &sysctl_fib_sync_mem_min,
 579                 .extra2         = &sysctl_fib_sync_mem_max,
 580         },
 581         { }
 582 };
 583
 584 static struct ctl_table ipv4_net_table[] = {
 585         {
 586                 .procname       = "tcp_max_tw_buckets",
 587                 .data           = &init_net.ipv4.tcp_death_row.sysctl_max_tw_buckets,
 588                 .maxlen         = sizeof(int),
 589                 .mode           = 0644,
 590                 .proc_handler   = proc_dointvec
 591         },
 592         {
 593                 .procname       = "icmp_echo_ignore_all",
 594                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 595                 .maxlen         = sizeof(u8),
 596                 .mode           = 0644,
 597                 .proc_handler   = proc_dou8vec_minmax,
 598                 .extra1         = SYSCTL_ZERO,
 599                 .extra2         = SYSCTL_ONE
 600         },
 601         {
 602                 .procname       = "icmp_echo_enable_probe",
 603                 .data           = &init_net.ipv4.sysctl_icmp_echo_enable_probe,
 604                 .maxlen         = sizeof(u8),
 605                 .mode           = 0644,
 606                 .proc_handler   = proc_dou8vec_minmax,
 607                 .extra1         = SYSCTL_ZERO,
 608                 .extra2         = SYSCTL_ONE
 609         },
 610         {
 611                 .procname       = "icmp_echo_ignore_broadcasts",
 612                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 613                 .maxlen         = sizeof(u8),
 614                 .mode           = 0644,
 615                 .proc_handler   = proc_dou8vec_minmax,
 616                 .extra1         = SYSCTL_ZERO,
 617                 .extra2         = SYSCTL_ONE
 618         },
 619         {
 620                 .procname       = "icmp_ignore_bogus_error_responses",
 621                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 622                 .maxlen         = sizeof(u8),
 623                 .mode           = 0644,
 624                 .proc_handler   = proc_dou8vec_minmax,
 625                 .extra1         = SYSCTL_ZERO,
 626                 .extra2         = SYSCTL_ONE
 627         },
 628         {
 629                 .procname       = "icmp_errors_use_inbound_ifaddr",
 630                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 631                 .maxlen         = sizeof(u8),
 632                 .mode           = 0644,
 633                 .proc_handler   = proc_dou8vec_minmax,
 634                 .extra1         = SYSCTL_ZERO,
 635                 .extra2         = SYSCTL_ONE
 636         },
 637         {
 638                 .procname       = "icmp_ratelimit",
 639                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 640                 .maxlen         = sizeof(int),
 641                 .mode           = 0644,
 642                 .proc_handler   = proc_dointvec_ms_jiffies,
 643         },
 644         {
 645                 .procname       = "icmp_ratemask",
 646                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 647                 .maxlen         = sizeof(int),
 648                 .mode           = 0644,
 649                 .proc_handler   = proc_dointvec
 650         },
 651         {
 652                 .procname       = "ping_group_range",
 653                 .data           = &init_net.ipv4.ping_group_range.range,
 654                 .maxlen         = sizeof(gid_t)*2,
 655                 .mode           = 0644,
 656                 .proc_handler   = ipv4_ping_group_range,
 657         },
 658 #ifdef CONFIG_NET_L3_MASTER_DEV
 659         {
 660                 .procname       = "raw_l3mdev_accept",
 661                 .data           = &init_net.ipv4.sysctl_raw_l3mdev_accept,
 662                 .maxlen         = sizeof(u8),
 663                 .mode           = 0644,
 664                 .proc_handler   = proc_dou8vec_minmax,
 665                 .extra1         = SYSCTL_ZERO,
 666                 .extra2         = SYSCTL_ONE,
 667         },
 668 #endif
 669         {
 670                 .procname       = "tcp_ecn",
 671                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 672                 .maxlen         = sizeof(u8),
 673                 .mode           = 0644,
 674                 .proc_handler   = proc_dou8vec_minmax,
 675                 .extra1         = SYSCTL_ZERO,
 676                 .extra2         = SYSCTL_TWO,
 677         },
 678         {
 679                 .procname       = "tcp_ecn_fallback",
 680                 .data           = &init_net.ipv4.sysctl_tcp_ecn_fallback,
 681                 .maxlen         = sizeof(u8),
 682                 .mode           = 0644,
 683                 .proc_handler   = proc_dou8vec_minmax,
 684                 .extra1         = SYSCTL_ZERO,
 685                 .extra2         = SYSCTL_ONE,
 686         },
 687         {
 688                 .procname       = "ip_dynaddr",
 689                 .data           = &init_net.ipv4.sysctl_ip_dynaddr,
 690                 .maxlen         = sizeof(u8),
 691                 .mode           = 0644,
 692                 .proc_handler   = proc_dou8vec_minmax,
 693         },
 694         {
 695                 .procname       = "ip_early_demux",
 696                 .data           = &init_net.ipv4.sysctl_ip_early_demux,
 697                 .maxlen         = sizeof(u8),
 698                 .mode           = 0644,
 699                 .proc_handler   = proc_dou8vec_minmax,
 700         },
 701         {
 702                 .procname       = "udp_early_demux",
 703                 .data           = &init_net.ipv4.sysctl_udp_early_demux,
 704                 .maxlen         = sizeof(u8),
 705                 .mode           = 0644,
 706                 .proc_handler   = proc_dou8vec_minmax,
 707         },
 708         {
 709                 .procname       = "tcp_early_demux",
 710                 .data           = &init_net.ipv4.sysctl_tcp_early_demux,
 711                 .maxlen         = sizeof(u8),
 712                 .mode           = 0644,
 713                 .proc_handler   = proc_dou8vec_minmax,
 714         },
 715         {
 716                 .procname       = "nexthop_compat_mode",
 717                 .data           = &init_net.ipv4.sysctl_nexthop_compat_mode,
 718                 .maxlen         = sizeof(u8),
 719                 .mode           = 0644,
 720                 .proc_handler   = proc_dou8vec_minmax,
 721                 .extra1         = SYSCTL_ZERO,
 722                 .extra2         = SYSCTL_ONE,
 723         },
 724         {
 725                 .procname       = "ip_default_ttl",
 726                 .data           = &init_net.ipv4.sysctl_ip_default_ttl,
 727                 .maxlen         = sizeof(u8),
 728                 .mode           = 0644,
 729                 .proc_handler   = proc_dou8vec_minmax,
 730                 .extra1         = &ip_ttl_min,
 731                 .extra2         = &ip_ttl_max,
 732         },
 733         {
 734                 .procname       = "ip_local_port_range",
 735                 .maxlen         = sizeof(init_net.ipv4.ip_local_ports.range),
 736                 .data           = &init_net.ipv4.ip_local_ports.range,
 737                 .mode           = 0644,
 738                 .proc_handler   = ipv4_local_port_range,
 739         },
 740         {
 741                 .procname       = "ip_local_reserved_ports",
 742                 .data           = &init_net.ipv4.sysctl_local_reserved_ports,
 743                 .maxlen         = 65536,
 744                 .mode           = 0644,
 745                 .proc_handler   = proc_do_large_bitmap,
 746         },
 747         {
 748                 .procname       = "ip_no_pmtu_disc",
 749                 .data           = &init_net.ipv4.sysctl_ip_no_pmtu_disc,
 750                 .maxlen         = sizeof(u8),
 751                 .mode           = 0644,
 752                 .proc_handler   = proc_dou8vec_minmax,
 753         },
 754         {
 755                 .procname       = "ip_forward_use_pmtu",
 756                 .data           = &init_net.ipv4.sysctl_ip_fwd_use_pmtu,
 757                 .maxlen         = sizeof(u8),
 758                 .mode           = 0644,
 759                 .proc_handler   = proc_dou8vec_minmax,
 760         },
 761         {
 762                 .procname       = "ip_forward_update_priority",
 763                 .data           = &init_net.ipv4.sysctl_ip_fwd_update_priority,
 764                 .maxlen         = sizeof(u8),
 765                 .mode           = 0644,
 766                 .proc_handler   = ipv4_fwd_update_priority,
 767                 .extra1         = SYSCTL_ZERO,
 768                 .extra2         = SYSCTL_ONE,
 769         },
 770         {
 771                 .procname       = "ip_nonlocal_bind",
 772                 .data           = &init_net.ipv4.sysctl_ip_nonlocal_bind,
 773                 .maxlen         = sizeof(u8),
 774                 .mode           = 0644,
 775                 .proc_handler   = proc_dou8vec_minmax,
 776         },
 777         {
 778                 .procname       = "ip_autobind_reuse",
 779                 .data           = &init_net.ipv4.sysctl_ip_autobind_reuse,
 780                 .maxlen         = sizeof(u8),
 781                 .mode           = 0644,
 782                 .proc_handler   = proc_dou8vec_minmax,
 783                 .extra1         = SYSCTL_ZERO,
 784                 .extra2         = SYSCTL_ONE,
 785         },
 786         {
 787                 .procname       = "fwmark_reflect",
 788                 .data           = &init_net.ipv4.sysctl_fwmark_reflect,
 789                 .maxlen         = sizeof(u8),
 790                 .mode           = 0644,
 791                 .proc_handler   = proc_dou8vec_minmax,
 792         },
 793         {
 794                 .procname       = "tcp_fwmark_accept",
 795                 .data           = &init_net.ipv4.sysctl_tcp_fwmark_accept,
 796                 .maxlen         = sizeof(u8),
 797                 .mode           = 0644,
 798                 .proc_handler   = proc_dou8vec_minmax,
 799         },
 800 #ifdef CONFIG_NET_L3_MASTER_DEV
 801         {
 802                 .procname       = "tcp_l3mdev_accept",
 803                 .data           = &init_net.ipv4.sysctl_tcp_l3mdev_accept,
 804                 .maxlen         = sizeof(u8),
 805                 .mode           = 0644,
 806                 .proc_handler   = proc_dou8vec_minmax,
 807                 .extra1         = SYSCTL_ZERO,
 808                 .extra2         = SYSCTL_ONE,
 809         },
 810 #endif
 811         {
 812                 .procname       = "tcp_mtu_probing",
 813                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probing,
 814                 .maxlen         = sizeof(u8),
 815                 .mode           = 0644,
 816                 .proc_handler   = proc_dou8vec_minmax,
 817         },
 818         {
 819                 .procname       = "tcp_base_mss",
 820                 .data           = &init_net.ipv4.sysctl_tcp_base_mss,
 821                 .maxlen         = sizeof(int),
 822                 .mode           = 0644,
 823                 .proc_handler   = proc_dointvec,
 824         },
 825         {
 826                 .procname       = "tcp_min_snd_mss",
 827                 .data           = &init_net.ipv4.sysctl_tcp_min_snd_mss,
 828                 .maxlen         = sizeof(int),
 829                 .mode           = 0644,
 830                 .proc_handler   = proc_dointvec_minmax,
 831                 .extra1         = &tcp_min_snd_mss_min,
 832                 .extra2         = &tcp_min_snd_mss_max,
 833         },
 834         {
 835                 .procname       = "tcp_mtu_probe_floor",
 836                 .data           = &init_net.ipv4.sysctl_tcp_mtu_probe_floor,
 837                 .maxlen         = sizeof(int),
 838                 .mode           = 0644,
 839                 .proc_handler   = proc_dointvec_minmax,
 840                 .extra1         = &tcp_min_snd_mss_min,
 841                 .extra2         = &tcp_min_snd_mss_max,
 842         },
 843         {
 844                 .procname       = "tcp_probe_threshold",
 845                 .data           = &init_net.ipv4.sysctl_tcp_probe_threshold,
 846                 .maxlen         = sizeof(int),
 847                 .mode           = 0644,
 848                 .proc_handler   = proc_dointvec,
 849         },
 850         {
 851                 .procname       = "tcp_probe_interval",
 852                 .data           = &init_net.ipv4.sysctl_tcp_probe_interval,
 853                 .maxlen         = sizeof(u32),
 854                 .mode           = 0644,
 855                 .proc_handler   = proc_douintvec_minmax,
 856                 .extra2         = &u32_max_div_HZ,
 857         },
 858         {
 859                 .procname       = "igmp_link_local_mcast_reports",
 860                 .data           = &init_net.ipv4.sysctl_igmp_llm_reports,
 861                 .maxlen         = sizeof(u8),
 862                 .mode           = 0644,
 863                 .proc_handler   = proc_dou8vec_minmax,
 864         },
 865         {
 866                 .procname       = "igmp_max_memberships",
 867                 .data           = &init_net.ipv4.sysctl_igmp_max_memberships,
 868                 .maxlen         = sizeof(int),
 869                 .mode           = 0644,
 870                 .proc_handler   = proc_dointvec
 871         },
 872         {
 873                 .procname       = "igmp_max_msf",
 874                 .data           = &init_net.ipv4.sysctl_igmp_max_msf,
 875                 .maxlen         = sizeof(int),
 876                 .mode           = 0644,
 877                 .proc_handler   = proc_dointvec
 878         },
 879 #ifdef CONFIG_IP_MULTICAST
 880         {
 881                 .procname       = "igmp_qrv",
 882                 .data           = &init_net.ipv4.sysctl_igmp_qrv,
 883                 .maxlen         = sizeof(int),
 884                 .mode           = 0644,
 885                 .proc_handler   = proc_dointvec_minmax,
 886                 .extra1         = SYSCTL_ONE
 887         },
 888 #endif
 889         {
 890                 .procname       = "tcp_congestion_control",
 891                 .data           = &init_net.ipv4.tcp_congestion_control,
 892                 .mode           = 0644,
 893                 .maxlen         = TCP_CA_NAME_MAX,
 894                 .proc_handler   = proc_tcp_congestion_control,
 895         },
 896         {
 897                 .procname       = "tcp_available_congestion_control",
 898                 .maxlen         = TCP_CA_BUF_MAX,
 899                 .mode           = 0444,
 900                 .proc_handler   = proc_tcp_available_congestion_control,
 901         },
 902         {
 903                 .procname       = "tcp_allowed_congestion_control",
 904                 .maxlen         = TCP_CA_BUF_MAX,
 905                 .mode           = 0644,
 906                 .proc_handler   = proc_allowed_congestion_control,
 907         },
 908         {
 909                 .procname       = "tcp_keepalive_time",
 910                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_time,
 911                 .maxlen         = sizeof(int),
 912                 .mode           = 0644,
 913                 .proc_handler   = proc_dointvec_jiffies,
 914         },
 915         {
 916                 .procname       = "tcp_keepalive_probes",
 917                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_probes,
 918                 .maxlen         = sizeof(u8),
 919                 .mode           = 0644,
 920                 .proc_handler   = proc_dou8vec_minmax,
 921         },
 922         {
 923                 .procname       = "tcp_keepalive_intvl",
 924                 .data           = &init_net.ipv4.sysctl_tcp_keepalive_intvl,
 925                 .maxlen         = sizeof(int),
 926                 .mode           = 0644,
 927                 .proc_handler   = proc_dointvec_jiffies,
 928         },
 929         {
 930                 .procname       = "tcp_syn_retries",
 931                 .data           = &init_net.ipv4.sysctl_tcp_syn_retries,
 932                 .maxlen         = sizeof(u8),
 933                 .mode           = 0644,
 934                 .proc_handler   = proc_dou8vec_minmax,
 935                 .extra1         = &tcp_syn_retries_min,
 936                 .extra2         = &tcp_syn_retries_max
 937         },
 938         {
 939                 .procname       = "tcp_synack_retries",
 940                 .data           = &init_net.ipv4.sysctl_tcp_synack_retries,
 941                 .maxlen         = sizeof(u8),
 942                 .mode           = 0644,
 943                 .proc_handler   = proc_dou8vec_minmax,
 944         },
 945 #ifdef CONFIG_SYN_COOKIES
 946         {
 947                 .procname       = "tcp_syncookies",
 948                 .data           = &init_net.ipv4.sysctl_tcp_syncookies,
 949                 .maxlen         = sizeof(u8),
 950                 .mode           = 0644,
 951                 .proc_handler   = proc_dou8vec_minmax,
 952         },
 953 #endif
 954         {
 955                 .procname       = "tcp_migrate_req",
 956                 .data           = &init_net.ipv4.sysctl_tcp_migrate_req,
 957                 .maxlen         = sizeof(u8),
 958                 .mode           = 0644,
 959                 .proc_handler   = proc_dou8vec_minmax,
 960                 .extra1         = SYSCTL_ZERO,
 961                 .extra2         = SYSCTL_ONE
 962         },
 963         {
 964                 .procname       = "tcp_reordering",
 965                 .data           = &init_net.ipv4.sysctl_tcp_reordering,
 966                 .maxlen         = sizeof(int),
 967                 .mode           = 0644,
 968                 .proc_handler   = proc_dointvec
 969         },
 970         {
 971                 .procname       = "tcp_retries1",
 972                 .data           = &init_net.ipv4.sysctl_tcp_retries1,
 973                 .maxlen         = sizeof(u8),
 974                 .mode           = 0644,
 975                 .proc_handler   = proc_dou8vec_minmax,
 976                 .extra2         = &tcp_retr1_max
 977         },
 978         {
 979                 .procname       = "tcp_retries2",
 980                 .data           = &init_net.ipv4.sysctl_tcp_retries2,
 981                 .maxlen         = sizeof(u8),
 982                 .mode           = 0644,
 983                 .proc_handler   = proc_dou8vec_minmax,
 984         },
 985         {
 986                 .procname       = "tcp_orphan_retries",
 987                 .data           = &init_net.ipv4.sysctl_tcp_orphan_retries,
 988                 .maxlen         = sizeof(u8),
 989                 .mode           = 0644,
 990                 .proc_handler   = proc_dou8vec_minmax,
 991         },
 992         {
 993                 .procname       = "tcp_fin_timeout",
 994                 .data           = &init_net.ipv4.sysctl_tcp_fin_timeout,
 995                 .maxlen         = sizeof(int),
 996                 .mode           = 0644,
 997                 .proc_handler   = proc_dointvec_jiffies,
 998         },
 999         {
1000                 .procname       = "tcp_notsent_lowat",
1001                 .data           = &init_net.ipv4.sysctl_tcp_notsent_lowat,
1002                 .maxlen         = sizeof(unsigned int),
1003                 .mode           = 0644,
1004                 .proc_handler   = proc_douintvec,
1005         },
1006         {
1007                 .procname       = "tcp_tw_reuse",
1008                 .data           = &init_net.ipv4.sysctl_tcp_tw_reuse,
1009                 .maxlen         = sizeof(u8),
1010                 .mode           = 0644,
1011                 .proc_handler   = proc_dou8vec_minmax,
1012                 .extra1         = SYSCTL_ZERO,
1013                 .extra2         = SYSCTL_TWO,
1014         },
1015         {
1016                 .procname       = "tcp_max_syn_backlog",
1017                 .data           = &init_net.ipv4.sysctl_max_syn_backlog,
1018                 .maxlen         = sizeof(int),
1019                 .mode           = 0644,
1020                 .proc_handler   = proc_dointvec
1021         },
1022         {
1023                 .procname       = "tcp_fastopen",
1024                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1025                 .maxlen         = sizeof(int),
1026                 .mode           = 0644,
1027                 .proc_handler   = proc_dointvec,
1028         },
1029         {
1030                 .procname       = "tcp_fastopen_key",
1031                 .mode           = 0600,
1032                 .data           = &init_net.ipv4.sysctl_tcp_fastopen,
1033                 /* maxlen to print the list of keys in hex (*2), with dashes
1034                  * separating doublewords and a comma in between keys.
1035                  */
1036                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH *
1037                                    2 * TCP_FASTOPEN_KEY_MAX) +
1038                                    (TCP_FASTOPEN_KEY_MAX * 5)),
1039                 .proc_handler   = proc_tcp_fastopen_key,
1040         },
1041         {
1042                 .procname       = "tcp_fastopen_blackhole_timeout_sec",
1043                 .data           = &init_net.ipv4.sysctl_tcp_fastopen_blackhole_timeout,
1044                 .maxlen         = sizeof(int),
1045                 .mode           = 0644,
1046                 .proc_handler   = proc_tfo_blackhole_detect_timeout,
1047                 .extra1         = SYSCTL_ZERO,
1048         },
1049 #ifdef CONFIG_IP_ROUTE_MULTIPATH
1050         {
1051                 .procname       = "fib_multipath_use_neigh",
1052                 .data           = &init_net.ipv4.sysctl_fib_multipath_use_neigh,
1053                 .maxlen         = sizeof(u8),
1054                 .mode           = 0644,
1055                 .proc_handler   = proc_dou8vec_minmax,
1056                 .extra1         = SYSCTL_ZERO,
1057                 .extra2         = SYSCTL_ONE,
1058         },
1059         {
1060                 .procname       = "fib_multipath_hash_policy",
1061                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_policy,
1062                 .maxlen         = sizeof(u8),
1063                 .mode           = 0644,
1064                 .proc_handler   = proc_fib_multipath_hash_policy,
1065                 .extra1         = SYSCTL_ZERO,
1066                 .extra2         = SYSCTL_THREE,
1067         },
1068         {
1069                 .procname       = "fib_multipath_hash_fields",
1070                 .data           = &init_net.ipv4.sysctl_fib_multipath_hash_fields,
1071                 .maxlen         = sizeof(u32),
1072                 .mode           = 0644,
1073                 .proc_handler   = proc_fib_multipath_hash_fields,
1074                 .extra1         = SYSCTL_ONE,
1075                 .extra2         = &fib_multipath_hash_fields_all_mask,
1076         },
1077 #endif
1078         {
1079                 .procname       = "ip_unprivileged_port_start",
1080                 .maxlen         = sizeof(int),
1081                 .data           = &init_net.ipv4.sysctl_ip_prot_sock,
1082                 .mode           = 0644,
1083                 .proc_handler   = ipv4_privileged_ports,
1084         },
1085 #ifdef CONFIG_NET_L3_MASTER_DEV
1086         {
1087                 .procname       = "udp_l3mdev_accept",
1088                 .data           = &init_net.ipv4.sysctl_udp_l3mdev_accept,
1089                 .maxlen         = sizeof(u8),
1090                 .mode           = 0644,
1091                 .proc_handler   = proc_dou8vec_minmax,
1092                 .extra1         = SYSCTL_ZERO,
1093                 .extra2         = SYSCTL_ONE,
1094         },
1095 #endif
1096         {
1097                 .procname       = "tcp_sack",
1098                 .data           = &init_net.ipv4.sysctl_tcp_sack,
1099                 .maxlen         = sizeof(u8),
1100                 .mode           = 0644,
1101                 .proc_handler   = proc_dou8vec_minmax,
1102         },
1103         {
1104                 .procname       = "tcp_window_scaling",
1105                 .data           = &init_net.ipv4.sysctl_tcp_window_scaling,
1106                 .maxlen         = sizeof(u8),
1107                 .mode           = 0644,
1108                 .proc_handler   = proc_dou8vec_minmax,
1109         },
1110         {
1111                 .procname       = "tcp_timestamps",
1112                 .data           = &init_net.ipv4.sysctl_tcp_timestamps,
1113                 .maxlen         = sizeof(u8),
1114                 .mode           = 0644,
1115                 .proc_handler   = proc_dou8vec_minmax,
1116         },
1117         {
1118                 .procname       = "tcp_early_retrans",
1119                 .data           = &init_net.ipv4.sysctl_tcp_early_retrans,
1120                 .maxlen         = sizeof(u8),
1121                 .mode           = 0644,
1122                 .proc_handler   = proc_dou8vec_minmax,
1123                 .extra1         = SYSCTL_ZERO,
1124                 .extra2         = SYSCTL_FOUR,
1125         },
1126         {
1127                 .procname       = "tcp_recovery",
1128                 .data           = &init_net.ipv4.sysctl_tcp_recovery,
1129                 .maxlen         = sizeof(u8),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dou8vec_minmax,
1132         },
1133         {
1134                 .procname       = "tcp_thin_linear_timeouts",
1135                 .data           = &init_net.ipv4.sysctl_tcp_thin_linear_timeouts,
1136                 .maxlen         = sizeof(u8),
1137                 .mode           = 0644,
1138                 .proc_handler   = proc_dou8vec_minmax,
1139         },
1140         {
1141                 .procname       = "tcp_slow_start_after_idle",
1142                 .data           = &init_net.ipv4.sysctl_tcp_slow_start_after_idle,
1143                 .maxlen         = sizeof(u8),
1144                 .mode           = 0644,
1145                 .proc_handler   = proc_dou8vec_minmax,
1146         },
1147         {
1148                 .procname       = "tcp_retrans_collapse",
1149                 .data           = &init_net.ipv4.sysctl_tcp_retrans_collapse,
1150                 .maxlen         = sizeof(u8),
1151                 .mode           = 0644,
1152                 .proc_handler   = proc_dou8vec_minmax,
1153         },
1154         {
1155                 .procname       = "tcp_stdurg",
1156                 .data           = &init_net.ipv4.sysctl_tcp_stdurg,
1157                 .maxlen         = sizeof(u8),
1158                 .mode           = 0644,
1159                 .proc_handler   = proc_dou8vec_minmax,
1160         },
1161         {
1162                 .procname       = "tcp_rfc1337",
1163                 .data           = &init_net.ipv4.sysctl_tcp_rfc1337,
1164                 .maxlen         = sizeof(u8),
1165                 .mode           = 0644,
1166                 .proc_handler   = proc_dou8vec_minmax,
1167         },
1168         {
1169                 .procname       = "tcp_abort_on_overflow",
1170                 .data           = &init_net.ipv4.sysctl_tcp_abort_on_overflow,
1171                 .maxlen         = sizeof(u8),
1172                 .mode           = 0644,
1173                 .proc_handler   = proc_dou8vec_minmax,
1174         },
1175         {
1176                 .procname       = "tcp_fack",
1177                 .data           = &init_net.ipv4.sysctl_tcp_fack,
1178                 .maxlen         = sizeof(u8),
1179                 .mode           = 0644,
1180                 .proc_handler   = proc_dou8vec_minmax,
1181         },
1182         {
1183                 .procname       = "tcp_max_reordering",
1184                 .data           = &init_net.ipv4.sysctl_tcp_max_reordering,
1185                 .maxlen         = sizeof(int),
1186                 .mode           = 0644,
1187                 .proc_handler   = proc_dointvec
1188         },
1189         {
1190                 .procname       = "tcp_dsack",
1191                 .data           = &init_net.ipv4.sysctl_tcp_dsack,
1192                 .maxlen         = sizeof(u8),
1193                 .mode           = 0644,
1194                 .proc_handler   = proc_dou8vec_minmax,
1195         },
1196         {
1197                 .procname       = "tcp_app_win",
1198                 .data           = &init_net.ipv4.sysctl_tcp_app_win,
1199                 .maxlen         = sizeof(u8),
1200                 .mode           = 0644,
1201                 .proc_handler   = proc_dou8vec_minmax,
1202                 .extra1         = SYSCTL_ZERO,
1203                 .extra2         = &tcp_app_win_max,
1204         },
1205         {
1206                 .procname       = "tcp_adv_win_scale",
1207                 .data           = &init_net.ipv4.sysctl_tcp_adv_win_scale,
1208                 .maxlen         = sizeof(int),
1209                 .mode           = 0644,
1210                 .proc_handler   = proc_dointvec_minmax,
1211                 .extra1         = &tcp_adv_win_scale_min,
1212                 .extra2         = &tcp_adv_win_scale_max,
1213         },
1214         {
1215                 .procname       = "tcp_frto",
1216                 .data           = &init_net.ipv4.sysctl_tcp_frto,
1217                 .maxlen         = sizeof(u8),
1218                 .mode           = 0644,
1219                 .proc_handler   = proc_dou8vec_minmax,
1220         },
1221         {
1222                 .procname       = "tcp_no_metrics_save",
1223                 .data           = &init_net.ipv4.sysctl_tcp_nometrics_save,
1224                 .maxlen         = sizeof(u8),
1225                 .mode           = 0644,
1226                 .proc_handler   = proc_dou8vec_minmax,
1227         },
1228         {
1229                 .procname       = "tcp_no_ssthresh_metrics_save",
1230                 .data           = &init_net.ipv4.sysctl_tcp_no_ssthresh_metrics_save,
1231                 .maxlen         = sizeof(u8),
1232                 .mode           = 0644,
1233                 .proc_handler   = proc_dou8vec_minmax,
1234                 .extra1         = SYSCTL_ZERO,
1235                 .extra2         = SYSCTL_ONE,
1236         },
1237         {
1238                 .procname       = "tcp_moderate_rcvbuf",
1239                 .data           = &init_net.ipv4.sysctl_tcp_moderate_rcvbuf,
1240                 .maxlen         = sizeof(u8),
1241                 .mode           = 0644,
1242                 .proc_handler   = proc_dou8vec_minmax,
1243         },
1244         {
1245                 .procname       = "tcp_tso_win_divisor",
1246                 .data           = &init_net.ipv4.sysctl_tcp_tso_win_divisor,
1247                 .maxlen         = sizeof(u8),
1248                 .mode           = 0644,
1249                 .proc_handler   = proc_dou8vec_minmax,
1250         },
1251         {
1252                 .procname       = "tcp_workaround_signed_windows",
1253                 .data           = &init_net.ipv4.sysctl_tcp_workaround_signed_windows,
1254                 .maxlen         = sizeof(u8),
1255                 .mode           = 0644,
1256                 .proc_handler   = proc_dou8vec_minmax,
1257         },
1258         {
1259                 .procname       = "tcp_limit_output_bytes",
1260                 .data           = &init_net.ipv4.sysctl_tcp_limit_output_bytes,
1261                 .maxlen         = sizeof(int),
1262                 .mode           = 0644,
1263                 .proc_handler   = proc_dointvec
1264         },
1265         {
1266                 .procname       = "tcp_challenge_ack_limit",
1267                 .data           = &init_net.ipv4.sysctl_tcp_challenge_ack_limit,
1268                 .maxlen         = sizeof(int),
1269                 .mode           = 0644,
1270                 .proc_handler   = proc_dointvec
1271         },
1272         {
1273                 .procname       = "tcp_min_tso_segs",
1274                 .data           = &init_net.ipv4.sysctl_tcp_min_tso_segs,
1275                 .maxlen         = sizeof(u8),
1276                 .mode           = 0644,
1277                 .proc_handler   = proc_dou8vec_minmax,
1278                 .extra1         = SYSCTL_ONE,
1279         },
1280         {
1281                 .procname       = "tcp_tso_rtt_log",
1282                 .data           = &init_net.ipv4.sysctl_tcp_tso_rtt_log,
1283                 .maxlen         = sizeof(u8),
1284                 .mode           = 0644,
1285                 .proc_handler   = proc_dou8vec_minmax,
1286         },
1287         {
1288                 .procname       = "tcp_min_rtt_wlen",
1289                 .data           = &init_net.ipv4.sysctl_tcp_min_rtt_wlen,
1290                 .maxlen         = sizeof(int),
1291                 .mode           = 0644,
1292                 .proc_handler   = proc_dointvec_minmax,
1293                 .extra1         = SYSCTL_ZERO,
1294                 .extra2         = &one_day_secs
1295         },
1296         {
1297                 .procname       = "tcp_autocorking",
1298                 .data           = &init_net.ipv4.sysctl_tcp_autocorking,
1299                 .maxlen         = sizeof(u8),
1300                 .mode           = 0644,
1301                 .proc_handler   = proc_dou8vec_minmax,
1302                 .extra1         = SYSCTL_ZERO,
1303                 .extra2         = SYSCTL_ONE,
1304         },
1305         {
1306                 .procname       = "tcp_invalid_ratelimit",
1307                 .data           = &init_net.ipv4.sysctl_tcp_invalid_ratelimit,
1308                 .maxlen         = sizeof(int),
1309                 .mode           = 0644,
1310                 .proc_handler   = proc_dointvec_ms_jiffies,
1311         },
1312         {
1313                 .procname       = "tcp_pacing_ss_ratio",
1314                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ss_ratio,
1315                 .maxlen         = sizeof(int),
1316                 .mode           = 0644,
1317                 .proc_handler   = proc_dointvec_minmax,
1318                 .extra1         = SYSCTL_ZERO,
1319                 .extra2         = SYSCTL_ONE_THOUSAND,
1320         },
1321         {
1322                 .procname       = "tcp_pacing_ca_ratio",
1323                 .data           = &init_net.ipv4.sysctl_tcp_pacing_ca_ratio,
1324                 .maxlen         = sizeof(int),
1325                 .mode           = 0644,
1326                 .proc_handler   = proc_dointvec_minmax,
1327                 .extra1         = SYSCTL_ZERO,
1328                 .extra2         = SYSCTL_ONE_THOUSAND,
1329         },
1330         {
1331                 .procname       = "tcp_wmem",
1332                 .data           = &init_net.ipv4.sysctl_tcp_wmem,
1333                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_wmem),
1334                 .mode           = 0644,
1335                 .proc_handler   = proc_dointvec_minmax,
1336                 .extra1         = SYSCTL_ONE,
1337         },
1338         {
1339                 .procname       = "tcp_rmem",
1340                 .data           = &init_net.ipv4.sysctl_tcp_rmem,
1341                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_rmem),
1342                 .mode           = 0644,
1343                 .proc_handler   = proc_dointvec_minmax,
1344                 .extra1         = SYSCTL_ONE,
1345         },
1346         {
1347                 .procname       = "tcp_comp_sack_delay_ns",
1348                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_delay_ns,
1349                 .maxlen         = sizeof(unsigned long),
1350                 .mode           = 0644,
1351                 .proc_handler   = proc_doulongvec_minmax,
1352         },
1353         {
1354                 .procname       = "tcp_comp_sack_slack_ns",
1355                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_slack_ns,
1356                 .maxlen         = sizeof(unsigned long),
1357                 .mode           = 0644,
1358                 .proc_handler   = proc_doulongvec_minmax,
1359         },
1360         {
1361                 .procname       = "tcp_comp_sack_nr",
1362                 .data           = &init_net.ipv4.sysctl_tcp_comp_sack_nr,
1363                 .maxlen         = sizeof(u8),
1364                 .mode           = 0644,
1365                 .proc_handler   = proc_dou8vec_minmax,
1366                 .extra1         = SYSCTL_ZERO,
1367         },
1368         {
1369                 .procname       = "tcp_reflect_tos",
1370                 .data           = &init_net.ipv4.sysctl_tcp_reflect_tos,
1371                 .maxlen         = sizeof(u8),
1372                 .mode           = 0644,
1373                 .proc_handler   = proc_dou8vec_minmax,
1374                 .extra1         = SYSCTL_ZERO,
1375                 .extra2         = SYSCTL_ONE,
1376         },
1377         {
1378                 .procname       = "tcp_ehash_entries",
1379                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1380                 .mode           = 0444,
1381                 .proc_handler   = proc_tcp_ehash_entries,
1382         },
1383         {
1384                 .procname       = "tcp_child_ehash_entries",
1385                 .data           = &init_net.ipv4.sysctl_tcp_child_ehash_entries,
1386                 .maxlen         = sizeof(unsigned int),
1387                 .mode           = 0644,
1388                 .proc_handler   = proc_douintvec_minmax,
1389                 .extra1         = SYSCTL_ZERO,
1390                 .extra2         = &tcp_child_ehash_entries_max,
1391         },
1392         {
1393                 .procname       = "udp_hash_entries",
1394                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1395                 .mode           = 0444,
1396                 .proc_handler   = proc_udp_hash_entries,
1397         },
1398         {
1399                 .procname       = "udp_child_hash_entries",
1400                 .data           = &init_net.ipv4.sysctl_udp_child_hash_entries,
1401                 .maxlen         = sizeof(unsigned int),
1402                 .mode           = 0644,
1403                 .proc_handler   = proc_douintvec_minmax,
1404                 .extra1         = SYSCTL_ZERO,
1405                 .extra2         = &udp_child_hash_entries_max,
1406         },
1407         {
1408                 .procname       = "udp_rmem_min",
1409                 .data           = &init_net.ipv4.sysctl_udp_rmem_min,
1410                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_rmem_min),
1411                 .mode           = 0644,
1412                 .proc_handler   = proc_dointvec_minmax,
1413                 .extra1         = SYSCTL_ONE
1414         },
1415         {
1416                 .procname       = "udp_wmem_min",
1417                 .data           = &init_net.ipv4.sysctl_udp_wmem_min,
1418                 .maxlen         = sizeof(init_net.ipv4.sysctl_udp_wmem_min),
1419                 .mode           = 0644,
1420                 .proc_handler   = proc_dointvec_minmax,
1421                 .extra1         = SYSCTL_ONE
1422         },
1423         {
1424                 .procname       = "fib_notify_on_flag_change",
1425                 .data           = &init_net.ipv4.sysctl_fib_notify_on_flag_change,
1426                 .maxlen         = sizeof(u8),
1427                 .mode           = 0644,
1428                 .proc_handler   = proc_dou8vec_minmax,
1429                 .extra1         = SYSCTL_ZERO,
1430                 .extra2         = SYSCTL_TWO,
1431         },
1432         {
1433                 .procname       = "tcp_plb_enabled",
1434                 .data           = &init_net.ipv4.sysctl_tcp_plb_enabled,
1435                 .maxlen         = sizeof(u8),
1436                 .mode           = 0644,
1437                 .proc_handler   = proc_dou8vec_minmax,
1438                 .extra1         = SYSCTL_ZERO,
1439                 .extra2         = SYSCTL_ONE,
1440         },
1441         {
1442                 .procname       = "tcp_plb_idle_rehash_rounds",
1443                 .data           = &init_net.ipv4.sysctl_tcp_plb_idle_rehash_rounds,
1444                 .maxlen         = sizeof(u8),
1445                 .mode           = 0644,
1446                 .proc_handler   = proc_dou8vec_minmax,
1447                 .extra2         = &tcp_plb_max_rounds,
1448         },
1449         {
1450                 .procname       = "tcp_plb_rehash_rounds",
1451                 .data           = &init_net.ipv4.sysctl_tcp_plb_rehash_rounds,
1452                 .maxlen         = sizeof(u8),
1453                 .mode           = 0644,
1454                 .proc_handler   = proc_dou8vec_minmax,
1455                 .extra2         = &tcp_plb_max_rounds,
1456         },
1457         {
1458                 .procname       = "tcp_plb_suspend_rto_sec",
1459                 .data           = &init_net.ipv4.sysctl_tcp_plb_suspend_rto_sec,
1460                 .maxlen         = sizeof(u8),
1461                 .mode           = 0644,
1462                 .proc_handler   = proc_dou8vec_minmax,
1463         },
1464         {
1465                 .procname       = "tcp_plb_cong_thresh",
1466                 .data           = &init_net.ipv4.sysctl_tcp_plb_cong_thresh,
1467                 .maxlen         = sizeof(int),
1468                 .mode           = 0644,
1469                 .proc_handler   = proc_dointvec_minmax,
1470                 .extra1         = SYSCTL_ZERO,
1471                 .extra2         = &tcp_plb_max_cong_thresh,
1472         },
1473         { }
1474 };
1475
1476 static __net_init int ipv4_sysctl_init_net(struct net *net)
1477 {
1478         struct ctl_table *table;
1479
1480         table = ipv4_net_table;
1481         if (!net_eq(net, &init_net)) {
1482                 int i;
1483
1484                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
1485                 if (!table)
1486                         goto err_alloc;
1487
1488                 for (i = 0; i < ARRAY_SIZE(ipv4_net_table) - 1; i++) {
1489                         if (table[i].data) {
1490                                 /* Update the variables to point into
1491                                  * the current struct net
1492                                  */
1493                                 table[i].data += (void *)net - (void *)&init_net;
1494                         } else {
1495                                 /* Entries without data pointer are global;
1496                                  * Make them read-only in non-init_net ns
1497                                  */
1498                                 table[i].mode &= ~0222;
1499                         }
1500                 }
1501         }
1502
1503         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
1504         if (!net->ipv4.ipv4_hdr)
1505                 goto err_reg;
1506
1507         net->ipv4.sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
1508         if (!net->ipv4.sysctl_local_reserved_ports)
1509                 goto err_ports;
1510
1511         return 0;
1512
1513 err_ports:
1514         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1515 err_reg:
1516         if (!net_eq(net, &init_net))
1517                 kfree(table);
1518 err_alloc:
1519         return -ENOMEM;
1520 }
1521
1522 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
1523 {
1524         struct ctl_table *table;
1525
1526         kfree(net->ipv4.sysctl_local_reserved_ports);
1527         table = net->ipv4.ipv4_hdr->ctl_table_arg;
1528         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
1529         kfree(table);
1530 }
1531
1532 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
1533         .init = ipv4_sysctl_init_net,
1534         .exit = ipv4_sysctl_exit_net,
1535 };
1536
1537 static __init int sysctl_ipv4_init(void)
1538 {
1539         struct ctl_table_header *hdr;
1540
1541         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
1542         if (!hdr)
1543                 return -ENOMEM;
1544
1545         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
1546                 unregister_net_sysctl_table(hdr);
1547                 return -ENOMEM;
1548         }
1549
1550         return 0;
1551 }
1552
1553 __initcall(sysctl_ipv4_init);