Pileus Git - ~andy/linux/blob - 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 one = 1;
  31 static int four = 4;
  32 static int gso_max_segs = GSO_MAX_SEGS;
  33 static int tcp_retr1_max = 255;
  34 static int ip_local_port_range_min[] = { 1, 1 };
  35 static int ip_local_port_range_max[] = { 65535, 65535 };
  36 static int tcp_adv_win_scale_min = -31;
  37 static int tcp_adv_win_scale_max = 31;
  38 static int ip_ttl_min = 1;
  39 static int ip_ttl_max = 255;
  40 static int tcp_syn_retries_min = 1;
  41 static int tcp_syn_retries_max = MAX_TCP_SYNCNT;
  42 static int ip_ping_group_range_min[] = { 0, 0 };
  43 static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
  44
  45 /* Update system visible IP port range */
  46 static void set_local_port_range(struct net *net, int range[2])
  47 {
  48         write_seqlock(&net->ipv4.sysctl_local_ports.lock);
  49         net->ipv4.sysctl_local_ports.range[0] = range[0];
  50         net->ipv4.sysctl_local_ports.range[1] = range[1];
  51         write_sequnlock(&net->ipv4.sysctl_local_ports.lock);
  52 }
  53
  54 /* Validate changes from /proc interface. */
  55 static int ipv4_local_port_range(struct ctl_table *table, int write,
  56                                  void __user *buffer,
  57                                  size_t *lenp, loff_t *ppos)
  58 {
  59         struct net *net =
  60                 container_of(table->data, struct net, ipv4.sysctl_local_ports.range);
  61         int ret;
  62         int range[2];
  63         struct ctl_table tmp = {
  64                 .data = &range,
  65                 .maxlen = sizeof(range),
  66                 .mode = table->mode,
  67                 .extra1 = &ip_local_port_range_min,
  68                 .extra2 = &ip_local_port_range_max,
  69         };
  70
  71         inet_get_local_port_range(net, &range[0], &range[1]);
  72
  73         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
  74
  75         if (write && ret == 0) {
  76                 if (range[1] < range[0])
  77                         ret = -EINVAL;
  78                 else
  79                         set_local_port_range(net, range);
  80         }
  81
  82         return ret;
  83 }
  84
  85
  86 static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
  87 {
  88         kgid_t *data = table->data;
  89         struct net *net =
  90                 container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
  91         unsigned int seq;
  92         do {
  93                 seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock);
  94
  95                 *low = data[0];
  96                 *high = data[1];
  97         } while (read_seqretry(&net->ipv4.sysctl_local_ports.lock, seq));
  98 }
  99
 100 /* Update system visible IP port range */
 101 static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
 102 {
 103         kgid_t *data = table->data;
 104         struct net *net =
 105                 container_of(table->data, struct net, ipv4.sysctl_ping_group_range);
 106         write_seqlock(&net->ipv4.sysctl_local_ports.lock);
 107         data[0] = low;
 108         data[1] = high;
 109         write_sequnlock(&net->ipv4.sysctl_local_ports.lock);
 110 }
 111
 112 /* Validate changes from /proc interface. */
 113 static int ipv4_ping_group_range(struct ctl_table *table, int write,
 114                                  void __user *buffer,
 115                                  size_t *lenp, loff_t *ppos)
 116 {
 117         struct user_namespace *user_ns = current_user_ns();
 118         int ret;
 119         gid_t urange[2];
 120         kgid_t low, high;
 121         struct ctl_table tmp = {
 122                 .data = &urange,
 123                 .maxlen = sizeof(urange),
 124                 .mode = table->mode,
 125                 .extra1 = &ip_ping_group_range_min,
 126                 .extra2 = &ip_ping_group_range_max,
 127         };
 128
 129         inet_get_ping_group_range_table(table, &low, &high);
 130         urange[0] = from_kgid_munged(user_ns, low);
 131         urange[1] = from_kgid_munged(user_ns, high);
 132         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
 133
 134         if (write && ret == 0) {
 135                 low = make_kgid(user_ns, urange[0]);
 136                 high = make_kgid(user_ns, urange[1]);
 137                 if (!gid_valid(low) || !gid_valid(high) ||
 138                     (urange[1] < urange[0]) || gid_lt(high, low)) {
 139                         low = make_kgid(&init_user_ns, 1);
 140                         high = make_kgid(&init_user_ns, 0);
 141                 }
 142                 set_ping_group_range(table, low, high);
 143         }
 144
 145         return ret;
 146 }
 147
 148 static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,
 149                                        void __user *buffer, size_t *lenp, loff_t *ppos)
 150 {
 151         char val[TCP_CA_NAME_MAX];
 152         struct ctl_table tbl = {
 153                 .data = val,
 154                 .maxlen = TCP_CA_NAME_MAX,
 155         };
 156         int ret;
 157
 158         tcp_get_default_congestion_control(val);
 159
 160         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 161         if (write && ret == 0)
 162                 ret = tcp_set_default_congestion_control(val);
 163         return ret;
 164 }
 165
 166 static int proc_tcp_available_congestion_control(struct ctl_table *ctl,
 167                                                  int write,
 168                                                  void __user *buffer, size_t *lenp,
 169                                                  loff_t *ppos)
 170 {
 171         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX, };
 172         int ret;
 173
 174         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 175         if (!tbl.data)
 176                 return -ENOMEM;
 177         tcp_get_available_congestion_control(tbl.data, TCP_CA_BUF_MAX);
 178         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 179         kfree(tbl.data);
 180         return ret;
 181 }
 182
 183 static int proc_allowed_congestion_control(struct ctl_table *ctl,
 184                                            int write,
 185                                            void __user *buffer, size_t *lenp,
 186                                            loff_t *ppos)
 187 {
 188         struct ctl_table tbl = { .maxlen = TCP_CA_BUF_MAX };
 189         int ret;
 190
 191         tbl.data = kmalloc(tbl.maxlen, GFP_USER);
 192         if (!tbl.data)
 193                 return -ENOMEM;
 194
 195         tcp_get_allowed_congestion_control(tbl.data, tbl.maxlen);
 196         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 197         if (write && ret == 0)
 198                 ret = tcp_set_allowed_congestion_control(tbl.data);
 199         kfree(tbl.data);
 200         return ret;
 201 }
 202
 203 static int ipv4_tcp_mem(struct ctl_table *ctl, int write,
 204                            void __user *buffer, size_t *lenp,
 205                            loff_t *ppos)
 206 {
 207         int ret;
 208         unsigned long vec[3];
 209         struct net *net = current->nsproxy->net_ns;
 210 #ifdef CONFIG_MEMCG_KMEM
 211         struct mem_cgroup *memcg;
 212 #endif
 213
 214         struct ctl_table tmp = {
 215                 .data = &vec,
 216                 .maxlen = sizeof(vec),
 217                 .mode = ctl->mode,
 218         };
 219
 220         if (!write) {
 221                 ctl->data = &net->ipv4.sysctl_tcp_mem;
 222                 return proc_doulongvec_minmax(ctl, write, buffer, lenp, ppos);
 223         }
 224
 225         ret = proc_doulongvec_minmax(&tmp, write, buffer, lenp, ppos);
 226         if (ret)
 227                 return ret;
 228
 229 #ifdef CONFIG_MEMCG_KMEM
 230         rcu_read_lock();
 231         memcg = mem_cgroup_from_task(current);
 232
 233         tcp_prot_mem(memcg, vec[0], 0);
 234         tcp_prot_mem(memcg, vec[1], 1);
 235         tcp_prot_mem(memcg, vec[2], 2);
 236         rcu_read_unlock();
 237 #endif
 238
 239         net->ipv4.sysctl_tcp_mem[0] = vec[0];
 240         net->ipv4.sysctl_tcp_mem[1] = vec[1];
 241         net->ipv4.sysctl_tcp_mem[2] = vec[2];
 242
 243         return 0;
 244 }
 245
 246 static int proc_tcp_fastopen_key(struct ctl_table *ctl, int write,
 247                                  void __user *buffer, size_t *lenp,
 248                                  loff_t *ppos)
 249 {
 250         struct ctl_table tbl = { .maxlen = (TCP_FASTOPEN_KEY_LENGTH * 2 + 10) };
 251         struct tcp_fastopen_context *ctxt;
 252         int ret;
 253         u32  user_key[4]; /* 16 bytes, matching TCP_FASTOPEN_KEY_LENGTH */
 254
 255         tbl.data = kmalloc(tbl.maxlen, GFP_KERNEL);
 256         if (!tbl.data)
 257                 return -ENOMEM;
 258
 259         rcu_read_lock();
 260         ctxt = rcu_dereference(tcp_fastopen_ctx);
 261         if (ctxt)
 262                 memcpy(user_key, ctxt->key, TCP_FASTOPEN_KEY_LENGTH);
 263         else
 264                 memset(user_key, 0, sizeof(user_key));
 265         rcu_read_unlock();
 266
 267         snprintf(tbl.data, tbl.maxlen, "%08x-%08x-%08x-%08x",
 268                 user_key[0], user_key[1], user_key[2], user_key[3]);
 269         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 270
 271         if (write && ret == 0) {
 272                 if (sscanf(tbl.data, "%x-%x-%x-%x", user_key, user_key + 1,
 273                            user_key + 2, user_key + 3) != 4) {
 274                         ret = -EINVAL;
 275                         goto bad_key;
 276                 }
 277                 tcp_fastopen_reset_cipher(user_key, TCP_FASTOPEN_KEY_LENGTH);
 278         }
 279
 280 bad_key:
 281         pr_debug("proc FO key set 0x%x-%x-%x-%x <- 0x%s: %u\n",
 282                user_key[0], user_key[1], user_key[2], user_key[3],
 283                (char *)tbl.data, ret);
 284         kfree(tbl.data);
 285         return ret;
 286 }
 287
 288 static struct ctl_table ipv4_table[] = {
 289         {
 290                 .procname       = "tcp_timestamps",
 291                 .data           = &sysctl_tcp_timestamps,
 292                 .maxlen         = sizeof(int),
 293                 .mode           = 0644,
 294                 .proc_handler   = proc_dointvec
 295         },
 296         {
 297                 .procname       = "tcp_window_scaling",
 298                 .data           = &sysctl_tcp_window_scaling,
 299                 .maxlen         = sizeof(int),
 300                 .mode           = 0644,
 301                 .proc_handler   = proc_dointvec
 302         },
 303         {
 304                 .procname       = "tcp_sack",
 305                 .data           = &sysctl_tcp_sack,
 306                 .maxlen         = sizeof(int),
 307                 .mode           = 0644,
 308                 .proc_handler   = proc_dointvec
 309         },
 310         {
 311                 .procname       = "tcp_retrans_collapse",
 312                 .data           = &sysctl_tcp_retrans_collapse,
 313                 .maxlen         = sizeof(int),
 314                 .mode           = 0644,
 315                 .proc_handler   = proc_dointvec
 316         },
 317         {
 318                 .procname       = "ip_default_ttl",
 319                 .data           = &sysctl_ip_default_ttl,
 320                 .maxlen         = sizeof(int),
 321                 .mode           = 0644,
 322                 .proc_handler   = proc_dointvec_minmax,
 323                 .extra1         = &ip_ttl_min,
 324                 .extra2         = &ip_ttl_max,
 325         },
 326         {
 327                 .procname       = "ip_no_pmtu_disc",
 328                 .data           = &ipv4_config.no_pmtu_disc,
 329                 .maxlen         = sizeof(int),
 330                 .mode           = 0644,
 331                 .proc_handler   = proc_dointvec
 332         },
 333         {
 334                 .procname       = "ip_nonlocal_bind",
 335                 .data           = &sysctl_ip_nonlocal_bind,
 336                 .maxlen         = sizeof(int),
 337                 .mode           = 0644,
 338                 .proc_handler   = proc_dointvec
 339         },
 340         {
 341                 .procname       = "tcp_syn_retries",
 342                 .data           = &sysctl_tcp_syn_retries,
 343                 .maxlen         = sizeof(int),
 344                 .mode           = 0644,
 345                 .proc_handler   = proc_dointvec_minmax,
 346                 .extra1         = &tcp_syn_retries_min,
 347                 .extra2         = &tcp_syn_retries_max
 348         },
 349         {
 350                 .procname       = "tcp_synack_retries",
 351                 .data           = &sysctl_tcp_synack_retries,
 352                 .maxlen         = sizeof(int),
 353                 .mode           = 0644,
 354                 .proc_handler   = proc_dointvec
 355         },
 356         {
 357                 .procname       = "tcp_max_orphans",
 358                 .data           = &sysctl_tcp_max_orphans,
 359                 .maxlen         = sizeof(int),
 360                 .mode           = 0644,
 361                 .proc_handler   = proc_dointvec
 362         },
 363         {
 364                 .procname       = "tcp_max_tw_buckets",
 365                 .data           = &tcp_death_row.sysctl_max_tw_buckets,
 366                 .maxlen         = sizeof(int),
 367                 .mode           = 0644,
 368                 .proc_handler   = proc_dointvec
 369         },
 370         {
 371                 .procname       = "ip_early_demux",
 372                 .data           = &sysctl_ip_early_demux,
 373                 .maxlen         = sizeof(int),
 374                 .mode           = 0644,
 375                 .proc_handler   = proc_dointvec
 376         },
 377         {
 378                 .procname       = "ip_dynaddr",
 379                 .data           = &sysctl_ip_dynaddr,
 380                 .maxlen         = sizeof(int),
 381                 .mode           = 0644,
 382                 .proc_handler   = proc_dointvec
 383         },
 384         {
 385                 .procname       = "tcp_keepalive_time",
 386                 .data           = &sysctl_tcp_keepalive_time,
 387                 .maxlen         = sizeof(int),
 388                 .mode           = 0644,
 389                 .proc_handler   = proc_dointvec_jiffies,
 390         },
 391         {
 392                 .procname       = "tcp_keepalive_probes",
 393                 .data           = &sysctl_tcp_keepalive_probes,
 394                 .maxlen         = sizeof(int),
 395                 .mode           = 0644,
 396                 .proc_handler   = proc_dointvec
 397         },
 398         {
 399                 .procname       = "tcp_keepalive_intvl",
 400                 .data           = &sysctl_tcp_keepalive_intvl,
 401                 .maxlen         = sizeof(int),
 402                 .mode           = 0644,
 403                 .proc_handler   = proc_dointvec_jiffies,
 404         },
 405         {
 406                 .procname       = "tcp_retries1",
 407                 .data           = &sysctl_tcp_retries1,
 408                 .maxlen         = sizeof(int),
 409                 .mode           = 0644,
 410                 .proc_handler   = proc_dointvec_minmax,
 411                 .extra2         = &tcp_retr1_max
 412         },
 413         {
 414                 .procname       = "tcp_retries2",
 415                 .data           = &sysctl_tcp_retries2,
 416                 .maxlen         = sizeof(int),
 417                 .mode           = 0644,
 418                 .proc_handler   = proc_dointvec
 419         },
 420         {
 421                 .procname       = "tcp_fin_timeout",
 422                 .data           = &sysctl_tcp_fin_timeout,
 423                 .maxlen         = sizeof(int),
 424                 .mode           = 0644,
 425                 .proc_handler   = proc_dointvec_jiffies,
 426         },
 427 #ifdef CONFIG_SYN_COOKIES
 428         {
 429                 .procname       = "tcp_syncookies",
 430                 .data           = &sysctl_tcp_syncookies,
 431                 .maxlen         = sizeof(int),
 432                 .mode           = 0644,
 433                 .proc_handler   = proc_dointvec
 434         },
 435 #endif
 436         {
 437                 .procname       = "tcp_fastopen",
 438                 .data           = &sysctl_tcp_fastopen,
 439                 .maxlen         = sizeof(int),
 440                 .mode           = 0644,
 441                 .proc_handler   = proc_dointvec,
 442         },
 443         {
 444                 .procname       = "tcp_fastopen_key",
 445                 .mode           = 0600,
 446                 .maxlen         = ((TCP_FASTOPEN_KEY_LENGTH * 2) + 10),
 447                 .proc_handler   = proc_tcp_fastopen_key,
 448         },
 449         {
 450                 .procname       = "tcp_tw_recycle",
 451                 .data           = &tcp_death_row.sysctl_tw_recycle,
 452                 .maxlen         = sizeof(int),
 453                 .mode           = 0644,
 454                 .proc_handler   = proc_dointvec
 455         },
 456         {
 457                 .procname       = "tcp_abort_on_overflow",
 458                 .data           = &sysctl_tcp_abort_on_overflow,
 459                 .maxlen         = sizeof(int),
 460                 .mode           = 0644,
 461                 .proc_handler   = proc_dointvec
 462         },
 463         {
 464                 .procname       = "tcp_stdurg",
 465                 .data           = &sysctl_tcp_stdurg,
 466                 .maxlen         = sizeof(int),
 467                 .mode           = 0644,
 468                 .proc_handler   = proc_dointvec
 469         },
 470         {
 471                 .procname       = "tcp_rfc1337",
 472                 .data           = &sysctl_tcp_rfc1337,
 473                 .maxlen         = sizeof(int),
 474                 .mode           = 0644,
 475                 .proc_handler   = proc_dointvec
 476         },
 477         {
 478                 .procname       = "tcp_max_syn_backlog",
 479                 .data           = &sysctl_max_syn_backlog,
 480                 .maxlen         = sizeof(int),
 481                 .mode           = 0644,
 482                 .proc_handler   = proc_dointvec
 483         },
 484         {
 485                 .procname       = "ip_local_reserved_ports",
 486                 .data           = NULL, /* initialized in sysctl_ipv4_init */
 487                 .maxlen         = 65536,
 488                 .mode           = 0644,
 489                 .proc_handler   = proc_do_large_bitmap,
 490         },
 491         {
 492                 .procname       = "igmp_max_memberships",
 493                 .data           = &sysctl_igmp_max_memberships,
 494                 .maxlen         = sizeof(int),
 495                 .mode           = 0644,
 496                 .proc_handler   = proc_dointvec
 497         },
 498         {
 499                 .procname       = "igmp_max_msf",
 500                 .data           = &sysctl_igmp_max_msf,
 501                 .maxlen         = sizeof(int),
 502                 .mode           = 0644,
 503                 .proc_handler   = proc_dointvec
 504         },
 505         {
 506                 .procname       = "inet_peer_threshold",
 507                 .data           = &inet_peer_threshold,
 508                 .maxlen         = sizeof(int),
 509                 .mode           = 0644,
 510                 .proc_handler   = proc_dointvec
 511         },
 512         {
 513                 .procname       = "inet_peer_minttl",
 514                 .data           = &inet_peer_minttl,
 515                 .maxlen         = sizeof(int),
 516                 .mode           = 0644,
 517                 .proc_handler   = proc_dointvec_jiffies,
 518         },
 519         {
 520                 .procname       = "inet_peer_maxttl",
 521                 .data           = &inet_peer_maxttl,
 522                 .maxlen         = sizeof(int),
 523                 .mode           = 0644,
 524                 .proc_handler   = proc_dointvec_jiffies,
 525         },
 526         {
 527                 .procname       = "tcp_orphan_retries",
 528                 .data           = &sysctl_tcp_orphan_retries,
 529                 .maxlen         = sizeof(int),
 530                 .mode           = 0644,
 531                 .proc_handler   = proc_dointvec
 532         },
 533         {
 534                 .procname       = "tcp_fack",
 535                 .data           = &sysctl_tcp_fack,
 536                 .maxlen         = sizeof(int),
 537                 .mode           = 0644,
 538                 .proc_handler   = proc_dointvec
 539         },
 540         {
 541                 .procname       = "tcp_reordering",
 542                 .data           = &sysctl_tcp_reordering,
 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_minmax,
 560                 .extra1         = &one,
 561         },
 562         {
 563                 .procname       = "tcp_notsent_lowat",
 564                 .data           = &sysctl_tcp_notsent_lowat,
 565                 .maxlen         = sizeof(sysctl_tcp_notsent_lowat),
 566                 .mode           = 0644,
 567                 .proc_handler   = proc_dointvec,
 568         },
 569         {
 570                 .procname       = "tcp_rmem",
 571                 .data           = &sysctl_tcp_rmem,
 572                 .maxlen         = sizeof(sysctl_tcp_rmem),
 573                 .mode           = 0644,
 574                 .proc_handler   = proc_dointvec_minmax,
 575                 .extra1         = &one,
 576         },
 577         {
 578                 .procname       = "tcp_app_win",
 579                 .data           = &sysctl_tcp_app_win,
 580                 .maxlen         = sizeof(int),
 581                 .mode           = 0644,
 582                 .proc_handler   = proc_dointvec
 583         },
 584         {
 585                 .procname       = "tcp_adv_win_scale",
 586                 .data           = &sysctl_tcp_adv_win_scale,
 587                 .maxlen         = sizeof(int),
 588                 .mode           = 0644,
 589                 .proc_handler   = proc_dointvec_minmax,
 590                 .extra1         = &tcp_adv_win_scale_min,
 591                 .extra2         = &tcp_adv_win_scale_max,
 592         },
 593         {
 594                 .procname       = "tcp_tw_reuse",
 595                 .data           = &sysctl_tcp_tw_reuse,
 596                 .maxlen         = sizeof(int),
 597                 .mode           = 0644,
 598                 .proc_handler   = proc_dointvec
 599         },
 600         {
 601                 .procname       = "tcp_frto",
 602                 .data           = &sysctl_tcp_frto,
 603                 .maxlen         = sizeof(int),
 604                 .mode           = 0644,
 605                 .proc_handler   = proc_dointvec
 606         },
 607         {
 608                 .procname       = "tcp_low_latency",
 609                 .data           = &sysctl_tcp_low_latency,
 610                 .maxlen         = sizeof(int),
 611                 .mode           = 0644,
 612                 .proc_handler   = proc_dointvec
 613         },
 614         {
 615                 .procname       = "tcp_no_metrics_save",
 616                 .data           = &sysctl_tcp_nometrics_save,
 617                 .maxlen         = sizeof(int),
 618                 .mode           = 0644,
 619                 .proc_handler   = proc_dointvec,
 620         },
 621         {
 622                 .procname       = "tcp_moderate_rcvbuf",
 623                 .data           = &sysctl_tcp_moderate_rcvbuf,
 624                 .maxlen         = sizeof(int),
 625                 .mode           = 0644,
 626                 .proc_handler   = proc_dointvec,
 627         },
 628         {
 629                 .procname       = "tcp_tso_win_divisor",
 630                 .data           = &sysctl_tcp_tso_win_divisor,
 631                 .maxlen         = sizeof(int),
 632                 .mode           = 0644,
 633                 .proc_handler   = proc_dointvec,
 634         },
 635         {
 636                 .procname       = "tcp_congestion_control",
 637                 .mode           = 0644,
 638                 .maxlen         = TCP_CA_NAME_MAX,
 639                 .proc_handler   = proc_tcp_congestion_control,
 640         },
 641         {
 642                 .procname       = "tcp_mtu_probing",
 643                 .data           = &sysctl_tcp_mtu_probing,
 644                 .maxlen         = sizeof(int),
 645                 .mode           = 0644,
 646                 .proc_handler   = proc_dointvec,
 647         },
 648         {
 649                 .procname       = "tcp_base_mss",
 650                 .data           = &sysctl_tcp_base_mss,
 651                 .maxlen         = sizeof(int),
 652                 .mode           = 0644,
 653                 .proc_handler   = proc_dointvec,
 654         },
 655         {
 656                 .procname       = "tcp_workaround_signed_windows",
 657                 .data           = &sysctl_tcp_workaround_signed_windows,
 658                 .maxlen         = sizeof(int),
 659                 .mode           = 0644,
 660                 .proc_handler   = proc_dointvec
 661         },
 662         {
 663                 .procname       = "tcp_limit_output_bytes",
 664                 .data           = &sysctl_tcp_limit_output_bytes,
 665                 .maxlen         = sizeof(int),
 666                 .mode           = 0644,
 667                 .proc_handler   = proc_dointvec
 668         },
 669         {
 670                 .procname       = "tcp_challenge_ack_limit",
 671                 .data           = &sysctl_tcp_challenge_ack_limit,
 672                 .maxlen         = sizeof(int),
 673                 .mode           = 0644,
 674                 .proc_handler   = proc_dointvec
 675         },
 676 #ifdef CONFIG_NET_DMA
 677         {
 678                 .procname       = "tcp_dma_copybreak",
 679                 .data           = &sysctl_tcp_dma_copybreak,
 680                 .maxlen         = sizeof(int),
 681                 .mode           = 0644,
 682                 .proc_handler   = proc_dointvec
 683         },
 684 #endif
 685         {
 686                 .procname       = "tcp_slow_start_after_idle",
 687                 .data           = &sysctl_tcp_slow_start_after_idle,
 688                 .maxlen         = sizeof(int),
 689                 .mode           = 0644,
 690                 .proc_handler   = proc_dointvec
 691         },
 692 #ifdef CONFIG_NETLABEL
 693         {
 694                 .procname       = "cipso_cache_enable",
 695                 .data           = &cipso_v4_cache_enabled,
 696                 .maxlen         = sizeof(int),
 697                 .mode           = 0644,
 698                 .proc_handler   = proc_dointvec,
 699         },
 700         {
 701                 .procname       = "cipso_cache_bucket_size",
 702                 .data           = &cipso_v4_cache_bucketsize,
 703                 .maxlen         = sizeof(int),
 704                 .mode           = 0644,
 705                 .proc_handler   = proc_dointvec,
 706         },
 707         {
 708                 .procname       = "cipso_rbm_optfmt",
 709                 .data           = &cipso_v4_rbm_optfmt,
 710                 .maxlen         = sizeof(int),
 711                 .mode           = 0644,
 712                 .proc_handler   = proc_dointvec,
 713         },
 714         {
 715                 .procname       = "cipso_rbm_strictvalid",
 716                 .data           = &cipso_v4_rbm_strictvalid,
 717                 .maxlen         = sizeof(int),
 718                 .mode           = 0644,
 719                 .proc_handler   = proc_dointvec,
 720         },
 721 #endif /* CONFIG_NETLABEL */
 722         {
 723                 .procname       = "tcp_available_congestion_control",
 724                 .maxlen         = TCP_CA_BUF_MAX,
 725                 .mode           = 0444,
 726                 .proc_handler   = proc_tcp_available_congestion_control,
 727         },
 728         {
 729                 .procname       = "tcp_allowed_congestion_control",
 730                 .maxlen         = TCP_CA_BUF_MAX,
 731                 .mode           = 0644,
 732                 .proc_handler   = proc_allowed_congestion_control,
 733         },
 734         {
 735                 .procname       = "tcp_max_ssthresh",
 736                 .data           = &sysctl_tcp_max_ssthresh,
 737                 .maxlen         = sizeof(int),
 738                 .mode           = 0644,
 739                 .proc_handler   = proc_dointvec,
 740         },
 741         {
 742                 .procname       = "tcp_thin_linear_timeouts",
 743                 .data           = &sysctl_tcp_thin_linear_timeouts,
 744                 .maxlen         = sizeof(int),
 745                 .mode           = 0644,
 746                 .proc_handler   = proc_dointvec
 747         },
 748         {
 749                 .procname       = "tcp_thin_dupack",
 750                 .data           = &sysctl_tcp_thin_dupack,
 751                 .maxlen         = sizeof(int),
 752                 .mode           = 0644,
 753                 .proc_handler   = proc_dointvec
 754         },
 755         {
 756                 .procname       = "tcp_early_retrans",
 757                 .data           = &sysctl_tcp_early_retrans,
 758                 .maxlen         = sizeof(int),
 759                 .mode           = 0644,
 760                 .proc_handler   = proc_dointvec_minmax,
 761                 .extra1         = &zero,
 762                 .extra2         = &four,
 763         },
 764         {
 765                 .procname       = "tcp_min_tso_segs",
 766                 .data           = &sysctl_tcp_min_tso_segs,
 767                 .maxlen         = sizeof(int),
 768                 .mode           = 0644,
 769                 .proc_handler   = proc_dointvec_minmax,
 770                 .extra1         = &zero,
 771                 .extra2         = &gso_max_segs,
 772         },
 773         {
 774                 .procname       = "udp_mem",
 775                 .data           = &sysctl_udp_mem,
 776                 .maxlen         = sizeof(sysctl_udp_mem),
 777                 .mode           = 0644,
 778                 .proc_handler   = proc_doulongvec_minmax,
 779         },
 780         {
 781                 .procname       = "udp_rmem_min",
 782                 .data           = &sysctl_udp_rmem_min,
 783                 .maxlen         = sizeof(sysctl_udp_rmem_min),
 784                 .mode           = 0644,
 785                 .proc_handler   = proc_dointvec_minmax,
 786                 .extra1         = &one
 787         },
 788         {
 789                 .procname       = "udp_wmem_min",
 790                 .data           = &sysctl_udp_wmem_min,
 791                 .maxlen         = sizeof(sysctl_udp_wmem_min),
 792                 .mode           = 0644,
 793                 .proc_handler   = proc_dointvec_minmax,
 794                 .extra1         = &one
 795         },
 796         { }
 797 };
 798
 799 static struct ctl_table ipv4_net_table[] = {
 800         {
 801                 .procname       = "icmp_echo_ignore_all",
 802                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_all,
 803                 .maxlen         = sizeof(int),
 804                 .mode           = 0644,
 805                 .proc_handler   = proc_dointvec
 806         },
 807         {
 808                 .procname       = "icmp_echo_ignore_broadcasts",
 809                 .data           = &init_net.ipv4.sysctl_icmp_echo_ignore_broadcasts,
 810                 .maxlen         = sizeof(int),
 811                 .mode           = 0644,
 812                 .proc_handler   = proc_dointvec
 813         },
 814         {
 815                 .procname       = "icmp_ignore_bogus_error_responses",
 816                 .data           = &init_net.ipv4.sysctl_icmp_ignore_bogus_error_responses,
 817                 .maxlen         = sizeof(int),
 818                 .mode           = 0644,
 819                 .proc_handler   = proc_dointvec
 820         },
 821         {
 822                 .procname       = "icmp_errors_use_inbound_ifaddr",
 823                 .data           = &init_net.ipv4.sysctl_icmp_errors_use_inbound_ifaddr,
 824                 .maxlen         = sizeof(int),
 825                 .mode           = 0644,
 826                 .proc_handler   = proc_dointvec
 827         },
 828         {
 829                 .procname       = "icmp_ratelimit",
 830                 .data           = &init_net.ipv4.sysctl_icmp_ratelimit,
 831                 .maxlen         = sizeof(int),
 832                 .mode           = 0644,
 833                 .proc_handler   = proc_dointvec_ms_jiffies,
 834         },
 835         {
 836                 .procname       = "icmp_ratemask",
 837                 .data           = &init_net.ipv4.sysctl_icmp_ratemask,
 838                 .maxlen         = sizeof(int),
 839                 .mode           = 0644,
 840                 .proc_handler   = proc_dointvec
 841         },
 842         {
 843                 .procname       = "ping_group_range",
 844                 .data           = &init_net.ipv4.sysctl_ping_group_range,
 845                 .maxlen         = sizeof(gid_t)*2,
 846                 .mode           = 0644,
 847                 .proc_handler   = ipv4_ping_group_range,
 848         },
 849         {
 850                 .procname       = "tcp_ecn",
 851                 .data           = &init_net.ipv4.sysctl_tcp_ecn,
 852                 .maxlen         = sizeof(int),
 853                 .mode           = 0644,
 854                 .proc_handler   = proc_dointvec
 855         },
 856         {
 857                 .procname       = "ip_local_port_range",
 858                 .maxlen         = sizeof(init_net.ipv4.sysctl_local_ports.range),
 859                 .data           = &init_net.ipv4.sysctl_local_ports.range,
 860                 .mode           = 0644,
 861                 .proc_handler   = ipv4_local_port_range,
 862         },
 863         {
 864                 .procname       = "tcp_mem",
 865                 .maxlen         = sizeof(init_net.ipv4.sysctl_tcp_mem),
 866                 .mode           = 0644,
 867                 .proc_handler   = ipv4_tcp_mem,
 868         },
 869         { }
 870 };
 871
 872 static __net_init int ipv4_sysctl_init_net(struct net *net)
 873 {
 874         struct ctl_table *table;
 875
 876         table = ipv4_net_table;
 877         if (!net_eq(net, &init_net)) {
 878                 table = kmemdup(table, sizeof(ipv4_net_table), GFP_KERNEL);
 879                 if (table == NULL)
 880                         goto err_alloc;
 881
 882                 table[0].data =
 883                         &net->ipv4.sysctl_icmp_echo_ignore_all;
 884                 table[1].data =
 885                         &net->ipv4.sysctl_icmp_echo_ignore_broadcasts;
 886                 table[2].data =
 887                         &net->ipv4.sysctl_icmp_ignore_bogus_error_responses;
 888                 table[3].data =
 889                         &net->ipv4.sysctl_icmp_errors_use_inbound_ifaddr;
 890                 table[4].data =
 891                         &net->ipv4.sysctl_icmp_ratelimit;
 892                 table[5].data =
 893                         &net->ipv4.sysctl_icmp_ratemask;
 894                 table[6].data =
 895                         &net->ipv4.sysctl_ping_group_range;
 896                 table[7].data =
 897                         &net->ipv4.sysctl_tcp_ecn;
 898                 table[8].data =
 899                         &net->ipv4.sysctl_local_ports.range;
 900
 901                 /* Don't export sysctls to unprivileged users */
 902                 if (net->user_ns != &init_user_ns)
 903                         table[0].procname = NULL;
 904         }
 905
 906         /*
 907          * Sane defaults - nobody may create ping sockets.
 908          * Boot scripts should set this to distro-specific group.
 909          */
 910         net->ipv4.sysctl_ping_group_range[0] = make_kgid(&init_user_ns, 1);
 911         net->ipv4.sysctl_ping_group_range[1] = make_kgid(&init_user_ns, 0);
 912
 913         /*
 914          * Set defaults for local port range
 915          */
 916         seqlock_init(&net->ipv4.sysctl_local_ports.lock);
 917         net->ipv4.sysctl_local_ports.range[0] =  32768;
 918         net->ipv4.sysctl_local_ports.range[1] =  61000;
 919
 920         tcp_init_mem(net);
 921
 922         net->ipv4.ipv4_hdr = register_net_sysctl(net, "net/ipv4", table);
 923         if (net->ipv4.ipv4_hdr == NULL)
 924                 goto err_reg;
 925
 926         return 0;
 927
 928 err_reg:
 929         if (!net_eq(net, &init_net))
 930                 kfree(table);
 931 err_alloc:
 932         return -ENOMEM;
 933 }
 934
 935 static __net_exit void ipv4_sysctl_exit_net(struct net *net)
 936 {
 937         struct ctl_table *table;
 938
 939         table = net->ipv4.ipv4_hdr->ctl_table_arg;
 940         unregister_net_sysctl_table(net->ipv4.ipv4_hdr);
 941         kfree(table);
 942 }
 943
 944 static __net_initdata struct pernet_operations ipv4_sysctl_ops = {
 945         .init = ipv4_sysctl_init_net,
 946         .exit = ipv4_sysctl_exit_net,
 947 };
 948
 949 static __init int sysctl_ipv4_init(void)
 950 {
 951         struct ctl_table_header *hdr;
 952         struct ctl_table *i;
 953
 954         for (i = ipv4_table; i->procname; i++) {
 955                 if (strcmp(i->procname, "ip_local_reserved_ports") == 0) {
 956                         i->data = sysctl_local_reserved_ports;
 957                         break;
 958                 }
 959         }
 960         if (!i->procname)
 961                 return -EINVAL;
 962
 963         hdr = register_net_sysctl(&init_net, "net/ipv4", ipv4_table);
 964         if (hdr == NULL)
 965                 return -ENOMEM;
 966
 967         if (register_pernet_subsys(&ipv4_sysctl_ops)) {
 968                 unregister_net_sysctl_table(hdr);
 969                 return -ENOMEM;
 970         }
 971
 972         return 0;
 973 }
 974
 975 __initcall(sysctl_ipv4_init);