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