net/ipv4/sysctl_net_ipv4.c

   1 /*
   2  * sysctl_net_ipv4.c: sysctl interface to net IPV4 subsystem.
   3  *
   4  * Begun April 1, 1996, Mike Shaver.
   5  * Added /proc/sys/net/ipv4 directory entry (empty =) ). [MS]
   6  */
   7
   8 #include <linux/mm.h>
   9 #include <linux/module.h>
  10 #include <linux/sysctl.h>
  11 #include <linux/igmp.h>
  12 #include <linux/inetdevice.h>
  13 #include <linux/seqlock.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/nsproxy.h>
  17 #include <linux/swap.h>
  18 #include <net/snmp.h>
  19 #include <net/icmp.h>
  20 #include <net/ip.h>
  21 #include <net/route.h>
  22 #include <net/tcp.h>
  23 #include <net/udp.h>
  24 #include <net/cipso_ipv4.h>
  25 #include <net/inet_frag.h>
  26 #include <net/ping.h>
  27 #include <net/tcp_memcontrol.h>
  28
  29 static int zero;
  30 static int two = 2;
  31 static int tcp_retr1_max = 255;
  32 static int ip_local_port_range_min[] = { 1, 1 };
  33 static int ip_local_port_range_max[] = { 65535, 65535 };
  34 static int tcp_adv_win_scale_min = -31;
  35 static int tcp_adv_win_scale_max = 31;
  36 static int ip_ttl_min = 1;
  37 static int ip_ttl_max = 255;
  38 static int ip_ping_group_range_min[] = { 0, 0 };
  39 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  40
  41 /* Update system visible IP port range */
  42 static void set_local_port_range(int range[2])
  43 {
  44         write_seqlock(&sysctl_local_ports.lock);
  45         sysctl_local_ports.range[0] = range[0];
  46         sysctl_local_ports.range[1] = range[1];
  47         write_sequnlock(&sysctl_local_ports.lock);
  48 }
  49
  50 /* Validate changes from /proc interface. */
  51 static int ipv4_local_port_range(ctl_table *table, int write,
  52                                  void __user *buffer,
  53                                  size_t *lenp, loff_t *ppos)
  54 {
  55         int ret;
  56         int range[2];
  57         ctl_table tmp = {
  58                 .data = &range,
  59                 .maxlen = sizeof(range),
  60                 .mode = table->mode,
  61                 .extra1 = &ip_local_port_range_min,
  62                 .extra2 = &ip_local_port_range_max,
  63         };
  64
  65         inet_get_local_port_range(range, range + 1);
  66         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  67
  68         if (write && ret == 0) {
  69                 if (range[1] < range[0])
  70                         ret = -EINVAL;
  71                 else
  72                         set_local_port_range(range);
  73         }
  74
  75         return ret;
  76 }
  77
  78
  79 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
  80 {
  81         kgid_t *data = table->data;
  82         unsigned int seq;
  83         do {
  84                 seq = read_seqbegin(&sysctl_local_ports.lock);
  85
  86                 *low = data[0];
  87                 *high = data[1];
  88         } while (read_seqretry(&sysctl_local_ports.lock, seq));
  89 }
  90
  91 /* Update system visible IP port range */
  92 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
  93 {
  94         kgid_t *data = table->data;
  95         write_seqlock(&sysctl_local_ports.lock);
  96         data[0] = low;
  97         data[1] = high;
  98         write_sequnlock(&sysctl_local_ports.lock);
  99 }
 100
 101 /* Validate changes from /proc interface. */
 102 static int ipv4_ping_group_range(ctl_table *table, int write,
 103                                  void __user *buffer,
 104                                  size_t *lenp, loff_t *ppos)
 105 {
 106         struct user_namespace *user_ns = current_user_ns();
 107         int ret;
 108         gid_t urange[2];
 109         kgid_t low, high;
 110         ctl_table tmp = {
 111                 .data = &urange,
 112                 .maxlen = sizeof(urange),
 113                 .mode = table->mode,
 114                 .extra1 = &ip_ping_group_range_min,
 115                 .extra2 = &ip_ping_group_range_max,
 116         };
 117
 118         inet_get_ping_group_range_table(table, &low, &high);
 119         urange[0] = from_kgid_munged(user_ns, low);
 120         urange[1] = from_kgid_munged(user_ns, high);
 121         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 122
 123         if (write && ret == 0) {
 124                 low = make_kgid(user_ns, urange[0]);
 125                 high = make_kgid(user_ns, urange[1]);
 126                 if (!gid_valid(low) || !gid_valid(high) ||
 127                     (urange[1] < urange[0]) || gid_lt(high, low)) {
 128                         low = make_kgid(&init_user_ns, 1);
 129                         high = make_kgid(&init_user_ns, 0);
 130                 }
 131                 set_ping_group_range(table, low, high);
 132         }
 133
 134         return ret;
 135 }
 136
 137 static int proc_tcp_congestion_control(ctl_table *ctl, int write,
 138                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 139 {
 140         char val[TCP_CA_NAME_MAX];
 141         ctl_table tbl = {
 142                 .data = val,
 143                 .maxlen = TCP_CA_NAME_MAX,
 144         };
 145         int ret;
 146
 147         tcp_get_default_congestion_control(val);
 148
 149         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 150         if (write && ret == 0)
 151                 ret = tcp_set_default_congestion_control(val);
 152         return ret;
 153 }
 154
 155 static int proc_tcp_available_congestion_control(ctl_table *ctl,
 156                                                  int write,
 157                                                  void __user *buffer, size_t *lenp,
 158                                                  loff_t *ppos)
 159 {
 160         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 161         int ret;
 162
 163         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 164         if (!tbl.data)
 165                 return -ENOMEM;
 166         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 167         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 168         kfree(tbl.data);
 169         return ret;
 170 }
 171
 172 static int proc_allowed_congestion_control(ctl_table *ctl,
 173                                            int write,
 174                                            void __user *buffer, size_t *lenp,
 175                                            loff_t *ppos)
 176 {
 177         ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 178         int ret;
 179
 180         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 181         if (!tbl.data)
 182                 return -ENOMEM;
 183
 184         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 185         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 186         if (write && ret == 0)
 187                 ret = tcp_set_allowed_congestion_control(tbl.data);
 188         kfree(tbl.data);
 189         return ret;
 190 }
 191
 192 static int ipv4_tcp_mem(ctl_table *ctl, int write,
 193                            void __user *buffer, size_t *lenp,
 194                            loff_t *ppos)
 195 {
 196         int ret;
 197         unsigned long vec[3];
 198         struct net *net = current->nsproxy->net_ns;
 199 #ifdef CONFIG_MEMCG_KMEM
 200         struct mem_cgroup *memcg;
 201 #endif
 202
 203         ctl_table tmp = {
 204                 .data = &vec,
 205                 .maxlen = sizeof(vec),
 206                 .mode = ctl->mode,
 207         };
 208
 209         if (!write) {
 210                 ctl->data = &net->ipv4.sysctl_tcp_mem;
 211                 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
 212         }
 213
 214         ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
 215         if (ret)
 216                 return ret;
 217
 218 #ifdef CONFIG_MEMCG_KMEM
 219         rcu_read_lock();
 220         memcg = mem_cgroup_from_task(current);
 221
 222         tcp_prot_mem(memcg, vec[0], 0);
 223         tcp_prot_mem(memcg, vec[1], 1);
 224         tcp_prot_mem(memcg, vec[2], 2);
 225         rcu_read_unlock();
 226 #endif
 227
 228         net->ipv4.sysctl_tcp_mem[0] = vec[0];
 229         net->ipv4.sysctl_tcp_mem[1] = vec[1];
 230         net->ipv4.sysctl_tcp_mem[2] = vec[2];
 231
 232         return 0;
 233 }
 234
 235 int proc_tcp_fastopen_key(ctl_table *ctl, int write, void __user *buffer,
 236                           size_t *lenp, loff_t *ppos)
 237 {
 238         ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
 239         struct tcp_fastopen_context *ctxt;
 240         int ret;
 241         u32  user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
 242
 243         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 244         if (!tbl.data)
 245                 return -ENOMEM;
 246
 247         rcu_read_lock();
 248         ctxt = rcu_dereference(tcp_fastopen_ctx);
 249         if (ctxt)
 250                 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
 251         else
 252                 memset(user_key, 0, sizeof(user_key));
 253         rcu_read_unlock();
 254
 255         snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
 256                 user_key[0], user_key[1], user_key[2], user_key[3]);
 257         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 258
 259         if (write && ret == 0) {
 260                 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
 261                            user_key + 2, user_key + 3) != 4) {
 262                         ret = -EINVAL;
 263                         goto bad_key;
 264                 }
 265                 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
 266         }
 267
 268 bad_key:
 269         pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 270                user_key[0], user_key[1], user_key[2], user_key[3],
 271                (char *)tbl.data, ret);
 272         kfree(tbl.data);
 273         return ret;
 274 }
 275
 276 static struct ctl_table ipv4_table[] = {
 277         {
 278                 .procname       = "tcp_timestamps",
 279                 .data           = &sysctl_tcp_timestamps,
 280                 .maxlen         = sizeof(int),
 281                 .mode           = 0644,
 282                 .proc_handler   = proc_dointvec
 283         },
 284         {
 285                 .procname       = "tcp_window_scaling",
 286                 .data           = &sysctl_tcp_window_scaling,
 287                 .maxlen         = sizeof(int),
 288                 .mode           = 0644,
 289                 .proc_handler   = proc_dointvec
 290         },
 291         {
 292                 .procname       = "tcp_sack",
 293                 .data           = &sysctl_tcp_sack,
 294                 .maxlen         = sizeof(int),
 295                 .mode           = 0644,
 296                 .proc_handler   = proc_dointvec
 297         },
 298         {
 299                 .procname       = "tcp_retrans_collapse",
 300                 .data           = &sysctl_tcp_retrans_collapse,
 301                 .maxlen         = sizeof(int),
 302                 .mode           = 0644,
 303                 .proc_handler   = proc_dointvec
 304         },
 305         {
 306                 .procname       = "ip_default_ttl",
 307                 .data           = &sysctl_ip_default_ttl,
 308                 .maxlen         = sizeof(int),
 309                 .mode           = 0644,
 310                 .proc_handler   = proc_dointvec_minmax,
 311                 .extra1         = &ip_ttl_min,
 312                 .extra2         = &ip_ttl_max,
 313         },
 314         {
 315                 .procname       = "ip_no_pmtu_disc",
 316                 .data           = &ipv4_config.no_pmtu_disc,
 317                 .maxlen         = sizeof(int),
 318                 .mode           = 0644,
 319                 .proc_handler   = proc_dointvec
 320         },
 321         {
 322                 .procname       = "ip_nonlocal_bind",
 323                 .data           = &sysctl_ip_nonlocal_bind,
 324                 .maxlen         = sizeof(int),
 325                 .mode           = 0644,
 326                 .proc_handler   = proc_dointvec
 327         },
 328         {
 329                 .procname       = "tcp_syn_retries",
 330                 .data           = &sysctl_tcp_syn_retries,
 331                 .maxlen         = sizeof(int),
 332                 .mode           = 0644,
 333                 .proc_handler   = proc_dointvec
 334         },
 335         {
 336                 .procname       = "tcp_synack_retries",
 337                 .data           = &sysctl_tcp_synack_retries,
 338                 .maxlen         = sizeof(int),
 339                 .mode           = 0644,
 340                 .proc_handler   = proc_dointvec
 341         },
 342         {
 343                 .procname       = "tcp_max_orphans",
 344                 .data           = &sysctl_tcp_max_orphans,
 345                 .maxlen         = sizeof(int),
 346                 .mode           = 0644,
 347                 .proc_handler   = proc_dointvec
 348         },
 349         {
 350                 .procname       = "tcp_max_tw_buckets",
 351                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = proc_dointvec
 355         },
 356         {
 357                 .procname       = "ip_early_demux",
 358                 .data           = &sysctl_ip_early_demux,
 359                 .maxlen         = sizeof(int),
 360                 .mode           = 0644,
 361                 .proc_handler   = proc_dointvec
 362         },
 363         {
 364                 .procname       = "ip_dynaddr",
 365                 .data           = &sysctl_ip_dynaddr,
 366                 .maxlen         = sizeof(int),
 367                 .mode           = 0644,
 368                 .proc_handler   = proc_dointvec
 369         },
 370         {
 371                 .procname       = "tcp_keepalive_time",
 372                 .data           = &sysctl_tcp_keepalive_time,
 373                 .maxlen         = sizeof(int),
 374                 .mode           = 0644,
 375                 .proc_handler   = proc_dointvec_jiffies,
 376         },
 377         {
 378                 .procname       = "tcp_keepalive_probes",
 379                 .data           = &sysctl_tcp_keepalive_probes,
 380                 .maxlen         = sizeof(int),
 381                 .mode           = 0644,
 382                 .proc_handler   = proc_dointvec
 383         },
 384         {
 385                 .procname       = "tcp_keepalive_intvl",
 386                 .data           = &sysctl_tcp_keepalive_intvl,
 387                 .maxlen         = sizeof(int),
 388                 .mode           = 0644,
 389                 .proc_handler   = proc_dointvec_jiffies,
 390         },
 391         {
 392                 .procname       = "tcp_retries1",
 393                 .data           = &sysctl_tcp_retries1,
 394                 .maxlen         = sizeof(int),
 395                 .mode           = 0644,
 396                 .proc_handler   = proc_dointvec_minmax,
 397                 .extra2         = &tcp_retr1_max
 398         },
 399         {
 400                 .procname       = "tcp_retries2",
 401                 .data           = &sysctl_tcp_retries2,
 402                 .maxlen         = sizeof(int),
 403                 .mode           = 0644,
 404                 .proc_handler   = proc_dointvec
 405         },
 406         {
 407                 .procname       = "tcp_fin_timeout",
 408                 .data           = &sysctl_tcp_fin_timeout,
 409                 .maxlen         = sizeof(int),
 410                 .mode           = 0644,
 411                 .proc_handler   = proc_dointvec_jiffies,
 412         },
 413 #ifdef CONFIG_SYN_COOKIES
 414         {
 415                 .procname       = "tcp_syncookies",
 416                 .data           = &sysctl_tcp_syncookies,
 417                 .maxlen         = sizeof(int),
 418                 .mode           = 0644,
 419                 .proc_handler   = proc_dointvec
 420         },
 421 #endif
 422         {
 423                 .procname       = "tcp_fastopen",
 424                 .data           = &sysctl_tcp_fastopen,
 425                 .maxlen         = sizeof(int),
 426                 .mode           = 0644,
 427                 .proc_handler   = proc_dointvec,
 428         },
 429         {
 430                 .procname       = "tcp_fastopen_key",
 431                 .mode           = 0600,
 432                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 433                 .proc_handler   = proc_tcp_fastopen_key,
 434         },
 435         {
 436                 .procname       = "tcp_tw_recycle",
 437                 .data           = &tcp_death_row.sysctl_tw_recycle,
 438                 .maxlen         = sizeof(int),
 439                 .mode           = 0644,
 440                 .proc_handler   = proc_dointvec
 441         },
 442         {
 443                 .procname       = "tcp_abort_on_overflow",
 444                 .data           = &sysctl_tcp_abort_on_overflow,
 445                 .maxlen         = sizeof(int),
 446                 .mode           = 0644,
 447                 .proc_handler   = proc_dointvec
 448         },
 449         {
 450                 .procname       = "tcp_stdurg",
 451                 .data           = &sysctl_tcp_stdurg,
 452                 .maxlen         = sizeof(int),
 453                 .mode           = 0644,
 454                 .proc_handler   = proc_dointvec
 455         },
 456         {
 457                 .procname       = "tcp_rfc1337",
 458                 .data           = &sysctl_tcp_rfc1337,
 459                 .maxlen         = sizeof(int),
 460                 .mode           = 0644,
 461                 .proc_handler   = proc_dointvec
 462         },
 463         {
 464                 .procname       = "tcp_max_syn_backlog",
 465                 .data           = &sysctl_max_syn_backlog,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec
 469         },
 470         {
 471                 .procname       = "ip_local_port_range",
 472                 .data           = &sysctl_local_ports.range,
 473                 .maxlen         = sizeof(sysctl_local_ports.range),
 474                 .mode           = 0644,
 475                 .proc_handler   = ipv4_local_port_range,
 476         },
 477         {
 478                 .procname       = "ip_local_reserved_ports",
 479                 .data           = NULL, /* initialized in sysctl_ipv4_init */
 480                 .maxlen         = 65536,
 481                 .mode           = 0644,
 482                 .proc_handler   = proc_do_large_bitmap,
 483         },
 484         {
 485                 .procname       = "igmp_max_memberships",
 486                 .data           = &sysctl_igmp_max_memberships,
 487                 .maxlen         = sizeof(int),
 488                 .mode           = 0644,
 489                 .proc_handler   = proc_dointvec
 490         },
 491         {
 492                 .procname       = "igmp_max_msf",
 493                 .data           = &sysctl_igmp_max_msf,
 494                 .maxlen         = sizeof(int),
 495                 .mode           = 0644,
 496                 .proc_handler   = proc_dointvec
 497         },
 498         {
 499                 .procname       = "inet_peer_threshold",
 500                 .data           = &inet_peer_threshold,
 501                 .maxlen         = sizeof(int),
 502                 .mode           = 0644,
 503                 .proc_handler   = proc_dointvec
 504         },
 505         {
 506                 .procname       = "inet_peer_minttl",
 507                 .data           = &inet_peer_minttl,
 508                 .maxlen         = sizeof(int),
 509                 .mode           = 0644,
 510                 .proc_handler   = proc_dointvec_jiffies,
 511         },
 512         {
 513                 .procname       = "inet_peer_maxttl",
 514                 .data           = &inet_peer_maxttl,
 515                 .maxlen         = sizeof(int),
 516                 .mode           = 0644,
 517                 .proc_handler   = proc_dointvec_jiffies,
 518         },
 519         {
 520                 .procname       = "tcp_orphan_retries",
 521                 .data           = &sysctl_tcp_orphan_retries,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = proc_dointvec
 525         },
 526         {
 527                 .procname       = "tcp_fack",
 528                 .data           = &sysctl_tcp_fack,
 529                 .maxlen         = sizeof(int),
 530                 .mode           = 0644,
 531                 .proc_handler   = proc_dointvec
 532         },
 533         {
 534                 .procname       = "tcp_reordering",
 535                 .data           = &sysctl_tcp_reordering,
 536                 .maxlen         = sizeof(int),
 537                 .mode           = 0644,
 538                 .proc_handler   = proc_dointvec
 539         },
 540         {
 541                 .procname       = "tcp_ecn",
 542                 .data           = &sysctl_tcp_ecn,
 543                 .maxlen         = sizeof(int),
 544                 .mode           = 0644,
 545                 .proc_handler   = proc_dointvec
 546         },
 547         {
 548                 .procname       = "tcp_dsack",
 549                 .data           = &sysctl_tcp_dsack,
 550                 .maxlen         = sizeof(int),
 551                 .mode           = 0644,
 552                 .proc_handler   = proc_dointvec
 553         },
 554         {
 555                 .procname       = "tcp_wmem",
 556                 .data           = &sysctl_tcp_wmem,
 557                 .maxlen         = sizeof(sysctl_tcp_wmem),
 558                 .mode           = 0644,
 559                 .proc_handler   = proc_dointvec
 560         },
 561         {
 562                 .procname       = "tcp_rmem",
 563                 .data           = &sysctl_tcp_rmem,
 564                 .maxlen         = sizeof(sysctl_tcp_rmem),
 565                 .mode           = 0644,
 566                 .proc_handler   = proc_dointvec
 567         },
 568         {
 569                 .procname       = "tcp_app_win",
 570                 .data           = &sysctl_tcp_app_win,
 571                 .maxlen         = sizeof(int),
 572                 .mode           = 0644,
 573                 .proc_handler   = proc_dointvec
 574         },
 575         {
 576                 .procname       = "tcp_adv_win_scale",
 577                 .data           = &sysctl_tcp_adv_win_scale,
 578                 .maxlen         = sizeof(int),
 579                 .mode           = 0644,
 580                 .proc_handler   = proc_dointvec_minmax,
 581                 .extra1         = &tcp_adv_win_scale_min,
 582                 .extra2         = &tcp_adv_win_scale_max,
 583         },
 584         {
 585                 .procname       = "tcp_tw_reuse",
 586                 .data           = &sysctl_tcp_tw_reuse,
 587                 .maxlen         = sizeof(int),
 588                 .mode           = 0644,
 589                 .proc_handler   = proc_dointvec
 590         },
 591         {
 592                 .procname       = "tcp_frto",
 593                 .data           = &sysctl_tcp_frto,
 594                 .maxlen         = sizeof(int),
 595                 .mode           = 0644,
 596                 .proc_handler   = proc_dointvec
 597         },
 598         {
 599                 .procname       = "tcp_frto_response",
 600                 .data           = &sysctl_tcp_frto_response,
 601                 .maxlen         = sizeof(int),
 602                 .mode           = 0644,
 603                 .proc_handler   = proc_dointvec
 604         },
 605         {
 606                 .procname       = "tcp_low_latency",
 607                 .data           = &sysctl_tcp_low_latency,
 608                 .maxlen         = sizeof(int),
 609                 .mode           = 0644,
 610                 .proc_handler   = proc_dointvec
 611         },
 612         {
 613                 .procname       = "tcp_no_metrics_save",
 614                 .data           = &sysctl_tcp_nometrics_save,
 615                 .maxlen         = sizeof(int),
 616                 .mode           = 0644,
 617                 .proc_handler   = proc_dointvec,
 618         },
 619         {
 620                 .procname       = "tcp_moderate_rcvbuf",
 621                 .data           = &sysctl_tcp_moderate_rcvbuf,
 622                 .maxlen         = sizeof(int),
 623                 .mode           = 0644,
 624                 .proc_handler   = proc_dointvec,
 625         },
 626         {
 627                 .procname       = "tcp_tso_win_divisor",
 628                 .data           = &sysctl_tcp_tso_win_divisor,
 629                 .maxlen         = sizeof(int),
 630                 .mode           = 0644,
 631                 .proc_handler   = proc_dointvec,
 632         },
 633         {
 634                 .procname       = "tcp_congestion_control",
 635                 .mode           = 0644,
 636                 .maxlen         = TCP_CA_NAME_MAX,
 637                 .proc_handler   = proc_tcp_congestion_control,
 638         },
 639         {
 640                 .procname       = "tcp_abc",
 641                 .data           = &sysctl_tcp_abc,
 642                 .maxlen         = sizeof(int),
 643                 .mode           = 0644,
 644                 .proc_handler   = proc_dointvec,
 645         },
 646         {
 647                 .procname       = "tcp_mtu_probing",
 648                 .data           = &sysctl_tcp_mtu_probing,
 649                 .maxlen         = sizeof(int),
 650                 .mode           = 0644,
 651                 .proc_handler   = proc_dointvec,
 652         },
 653         {
 654                 .procname       = "tcp_base_mss",
 655                 .data           = &sysctl_tcp_base_mss,
 656                 .maxlen         = sizeof(int),
 657                 .mode           = 0644,
 658                 .proc_handler   = proc_dointvec,
 659         },
 660         {
 661                 .procname       = "tcp_workaround_signed_windows",
 662                 .data           = &sysctl_tcp_workaround_signed_windows,
 663                 .maxlen         = sizeof(int),
 664                 .mode           = 0644,
 665                 .proc_handler   = proc_dointvec
 666         },
 667         {
 668                 .procname       = "tcp_limit_output_bytes",
 669                 .data           = &sysctl_tcp_limit_output_bytes,
 670                 .maxlen         = sizeof(int),
 671                 .mode           = 0644,
 672                 .proc_handler   = proc_dointvec
 673         },
 674         {
 675                 .procname       = "tcp_challenge_ack_limit",
 676                 .data           = &sysctl_tcp_challenge_ack_limit,
 677                 .maxlen         = sizeof(int),
 678                 .mode           = 0644,
 679                 .proc_handler   = proc_dointvec
 680         },
 681 #ifdef CONFIG_NET_DMA
 682         {
 683                 .procname       = "tcp_dma_copybreak",
 684                 .data           = &sysctl_tcp_dma_copybreak,
 685                 .maxlen         = sizeof(int),
 686                 .mode           = 0644,
 687                 .proc_handler   = proc_dointvec
 688         },
 689 #endif
 690         {
 691                 .procname       = "tcp_slow_start_after_idle",
 692                 .data           = &sysctl_tcp_slow_start_after_idle,
 693                 .maxlen         = sizeof(int),
 694                 .mode           = 0644,
 695                 .proc_handler   = proc_dointvec
 696         },
 697 #ifdef CONFIG_NETLABEL
 698         {
 699                 .procname       = "cipso_cache_enable",
 700                 .data           = &cipso_v4_cache_enabled,
 701                 .maxlen         = sizeof(int),
 702                 .mode           = 0644,
 703                 .proc_handler   = proc_dointvec,
 704         },
 705         {
 706                 .procname       = "cipso_cache_bucket_size",
 707                 .data           = &cipso_v4_cache_bucketsize,
 708                 .maxlen         = sizeof(int),
 709                 .mode           = 0644,
 710                 .proc_handler   = proc_dointvec,
 711         },
 712         {
 713                 .procname       = "cipso_rbm_optfmt",
 714                 .data           = &cipso_v4_rbm_optfmt,
 715                 .maxlen         = sizeof(int),
 716                 .mode           = 0644,
 717                 .proc_handler   = proc_dointvec,
 718         },
 719         {
 720                 .procname       = "cipso_rbm_strictvalid",
 721                 .data           = &cipso_v4_rbm_strictvalid,
 722                 .maxlen         = sizeof(int),
 723                 .mode           = 0644,
 724                 .proc_handler   = proc_dointvec,
 725         },
 726 #endif /* CONFIG_NETLABEL */
 727         {
 728                 .procname       = "tcp_available_congestion_control",
 729                 .maxlen         = TCP_CA_BUF_MAX,
 730                 .mode           = 0444,
 731                 .proc_handler   = proc_tcp_available_congestion_control,
 732         },
 733         {
 734                 .procname       = "tcp_allowed_congestion_control",
 735                 .maxlen         = TCP_CA_BUF_MAX,
 736                 .mode           = 0644,
 737                 .proc_handler   = proc_allowed_congestion_control,
 738         },
 739         {
 740                 .procname       = "tcp_max_ssthresh",
 741                 .data           = &sysctl_tcp_max_ssthresh,
 742                 .maxlen         = sizeof(int),
 743                 .mode           = 0644,
 744                 .proc_handler   = proc_dointvec,
 745         },
 746         {
 747                 .procname       = "tcp_cookie_size",
 748                 .data           = &sysctl_tcp_cookie_size,
 749                 .maxlen         = sizeof(int),
 750                 .mode           = 0644,
 751                 .proc_handler   = proc_dointvec
 752         },
 753         {
 754                 .procname       = "tcp_thin_linear_timeouts",
 755                 .data           = &sysctl_tcp_thin_linear_timeouts,
 756                 .maxlen         = sizeof(int),
 757                 .mode           = 0644,
 758                 .proc_handler   = proc_dointvec
 759         },
 760         {
 761                 .procname       = "tcp_thin_dupack",
 762                 .data           = &sysctl_tcp_thin_dupack,
 763                 .maxlen         = sizeof(int),
 764                 .mode           = 0644,
 765                 .proc_handler   = proc_dointvec
 766         },
 767         {
 768                 .procname       = "tcp_early_retrans",
 769                 .data           = &sysctl_tcp_early_retrans,
 770                 .maxlen         = sizeof(int),
 771                 .mode           = 0644,
 772                 .proc_handler   = proc_dointvec_minmax,
 773                 .extra1         = &zero,
 774                 .extra2         = &two,
 775         },
 776         {
 777                 .procname       = "udp_mem",
 778                 .data           = &sysctl_udp_mem,
 779                 .maxlen         = sizeof(sysctl_udp_mem),
 780                 .mode           = 0644,
 781                 .proc_handler   = proc_doulongvec_minmax,
 782         },
 783         {
 784                 .procname       = "udp_rmem_min",
 785                 .data           = &sysctl_udp_rmem_min,
 786                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 787                 .mode           = 0644,
 788                 .proc_handler   = proc_dointvec_minmax,
 789                 .extra1         = &zero
 790         },
 791         {
 792                 .procname       = "udp_wmem_min",
 793                 .data           = &sysctl_udp_wmem_min,
 794                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 795                 .mode           = 0644,
 796                 .proc_handler   = proc_dointvec_minmax,
 797                 .extra1         = &zero
 798         },
 799         { }
 800 };
 801
 802 static struct ctl_table ipv4_net_table[] = {
 803         {
 804                 .procname       = "icmp_echo_ignore_all",
 805                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 806                 .maxlen         = sizeof(int),
 807                 .mode           = 0644,
 808                 .proc_handler   = proc_dointvec
 809         },
 810         {
 811                 .procname       = "icmp_echo_ignore_broadcasts",
 812                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 813                 .maxlen         = sizeof(int),
 814                 .mode           = 0644,
 815                 .proc_handler   = proc_dointvec
 816         },
 817         {
 818                 .procname       = "icmp_ignore_bogus_error_responses",
 819                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 820                 .maxlen         = sizeof(int),
 821                 .mode           = 0644,
 822                 .proc_handler   = proc_dointvec
 823         },
 824         {
 825                 .procname       = "icmp_errors_use_inbound_ifaddr",
 826                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 827                 .maxlen         = sizeof(int),
 828                 .mode           = 0644,
 829                 .proc_handler   = proc_dointvec
 830         },
 831         {
 832                 .procname       = "icmp_ratelimit",
 833                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 834                 .maxlen         = sizeof(int),
 835                 .mode           = 0644,
 836                 .proc_handler   = proc_dointvec_ms_jiffies,
 837         },
 838         {
 839                 .procname       = "icmp_ratemask",
 840                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 841                 .maxlen         = sizeof(int),
 842                 .mode           = 0644,
 843                 .proc_handler   = proc_dointvec
 844         },
 845         {
 846                 .procname       = "ping_group_range",
 847                 .data           = &init_net.ipv4.sysctl_ping_group_range,
 848                 .maxlen         = sizeof(gid_t)*2,
 849                 .mode           = 0644,
 850                 .proc_handler   = ipv4_ping_group_range,
 851         },
 852         {
 853                 .procname       = "tcp_mem",
 854                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_mem),
 855                 .mode           = 0644,
 856                 .proc_handler   = ipv4_tcp_mem,
 857         },
 858         { }
 859 };
 860
 861 static __net_init int ipv4_sysctl_init_net(struct net *net)
 862 {
 863         struct ctl_table *table;
 864
 865         table = ipv4_net_table;
 866         if (!net_eq(net, &init_net)) {
 867                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
 868                 if (table == NULL)
 869                         goto err_alloc;
 870
 871                 table[0].data =
 872                         &net->ipv4.sysctl_icmp_echo_ignore_all;
 873                 table[1].data =
 874                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
 875                 table[2].data =
 876                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
 877                 table[3].data =
 878                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
 879                 table[4].data =
 880                         &net->ipv4.sysctl_icmp_ratelimit;
 881                 table[5].data =
 882                         &net->ipv4.sysctl_icmp_ratemask;
 883                 table[6].data =
 884                         &net->ipv4.sysctl_ping_group_range;
 885
 886         }
 887
 888         /*
 889          * Sane defaults - nobody may create ping sockets.
 890          * Boot scripts should set this to distro-specific group.
 891          */
 892         net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
 893         net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
 894
 895         tcp_init_mem(net);
 896
 897         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
 898         if (net->ipv4.ipv4_hdr == NULL)
 899                 goto err_reg;
 900
 901         return 0;
 902
 903 err_reg:
 904         if (!net_eq(net, &init_net))
 905                 kfree(table);
 906 err_alloc:
 907         return -ENOMEM;
 908 }
 909
 910 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 911 {
 912         struct ctl_table *table;
 913
 914         table = net->ipv4.ipv4_hdr->ctl_table_arg;
 915         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
 916         kfree(table);
 917 }
 918
 919 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 920         .init = ipv4_sysctl_init_net,
 921         .exit = ipv4_sysctl_exit_net,
 922 };
 923
 924 static __init int sysctl_ipv4_init(void)
 925 {
 926         struct ctl_table_header *hdr;
 927         struct ctl_table *i;
 928
 929         for (i = ipv4_table; i->procname; i++) {
 930                 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
 931                         i->data = sysctl_local_reserved_ports;
 932                         break;
 933                 }
 934         }
 935         if (!i->procname)
 936                 return -EINVAL;
 937
 938         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
 939         if (hdr == NULL)
 940                 return -ENOMEM;
 941
 942         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
 943                 unregister_net_sysctl_table(hdr);
 944                 return -ENOMEM;
 945         }
 946
 947         return 0;
 948 }
 949
 950 __initcall(sysctl_ipv4_init);