net/sctp/sysctl.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* SCTP kernel implementation
   3  * (C) Copyright IBM Corp. 2002, 2004
   4  * Copyright (c) 2002 Intel Corp.
   5  *
   6  * This file is part of the SCTP kernel implementation
   7  *
   8  * Sysctl related interfaces for SCTP.
   9  *
  10  * Please send any bug reports or fixes you make to the
  11  * email address(es):
  12  *    lksctp developers <linux-sctp@vger.kernel.org>
  13  *
  14  * Written or modified by:
  15  *    Mingqin Liu           <liuming@us.ibm.com>
  16  *    Jon Grimm             <jgrimm@us.ibm.com>
  17  *    Ardelle Fan           <ardelle.fan@intel.com>
  18  *    Ryan Layer            <rmlayer@us.ibm.com>
  19  *    Sridhar Samudrala     <sri@us.ibm.com>
  20  */
  21
  22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  23
  24 #include <net/sctp/structs.h>
  25 #include <net/sctp/sctp.h>
  26 #include <linux/sysctl.h>
  27
  28 static int timer_max = 86400000; /* ms in one day */
  29 static int sack_timer_min = 1;
  30 static int sack_timer_max = 500;
  31 static int addr_scope_max = SCTP_SCOPE_POLICY_MAX;
  32 static int rwnd_scale_max = 16;
  33 static int rto_alpha_min = 0;
  34 static int rto_beta_min = 0;
  35 static int rto_alpha_max = 1000;
  36 static int rto_beta_max = 1000;
  37 static int pf_expose_max = SCTP_PF_EXPOSE_MAX;
  38 static int ps_retrans_max = SCTP_PS_RETRANS_MAX;
  39 static int udp_port_max = 65535;
  40
  41 static unsigned long max_autoclose_min = 0;
  42 static unsigned long max_autoclose_max =
  43         (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
  44         ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
  45
  46 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
  47                                  void *buffer, size_t *lenp, loff_t *ppos);
  48 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
  49                                 void *buffer, size_t *lenp, loff_t *ppos);
  50 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write, void *buffer,
  51                                 size_t *lenp, loff_t *ppos);
  52 static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write, void *buffer,
  53                                  size_t *lenp, loff_t *ppos);
  54 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
  55                                    void *buffer, size_t *lenp, loff_t *ppos);
  56 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
  57                              void *buffer, size_t *lenp, loff_t *ppos);
  58 static int proc_sctp_do_probe_interval(struct ctl_table *ctl, int write,
  59                                        void *buffer, size_t *lenp, loff_t *ppos);
  60
  61 static struct ctl_table sctp_table[] = {
  62         {
  63                 .procname       = "sctp_mem",
  64                 .data           = &sysctl_sctp_mem,
  65                 .maxlen         = sizeof(sysctl_sctp_mem),
  66                 .mode           = 0644,
  67                 .proc_handler   = proc_doulongvec_minmax
  68         },
  69         {
  70                 .procname       = "sctp_rmem",
  71                 .data           = &sysctl_sctp_rmem,
  72                 .maxlen         = sizeof(sysctl_sctp_rmem),
  73                 .mode           = 0644,
  74                 .proc_handler   = proc_dointvec,
  75         },
  76         {
  77                 .procname       = "sctp_wmem",
  78                 .data           = &sysctl_sctp_wmem,
  79                 .maxlen         = sizeof(sysctl_sctp_wmem),
  80                 .mode           = 0644,
  81                 .proc_handler   = proc_dointvec,
  82         },
  83
  84         { /* sentinel */ }
  85 };
  86
  87 /* The following index defines are used in sctp_sysctl_net_register().
  88  * If you add new items to the sctp_net_table, please ensure that
  89  * the index values of these defines hold the same meaning indicated by
  90  * their macro names when they appear in sctp_net_table.
  91  */
  92 #define SCTP_RTO_MIN_IDX       0
  93 #define SCTP_RTO_MAX_IDX       1
  94 #define SCTP_PF_RETRANS_IDX    2
  95 #define SCTP_PS_RETRANS_IDX    3
  96
  97 static struct ctl_table sctp_net_table[] = {
  98         [SCTP_RTO_MIN_IDX] = {
  99                 .procname       = "rto_min",
 100                 .data           = &init_net.sctp.rto_min,
 101                 .maxlen         = sizeof(unsigned int),
 102                 .mode           = 0644,
 103                 .proc_handler   = proc_sctp_do_rto_min,
 104                 .extra1         = SYSCTL_ONE,
 105                 .extra2         = &init_net.sctp.rto_max
 106         },
 107         [SCTP_RTO_MAX_IDX] =  {
 108                 .procname       = "rto_max",
 109                 .data           = &init_net.sctp.rto_max,
 110                 .maxlen         = sizeof(unsigned int),
 111                 .mode           = 0644,
 112                 .proc_handler   = proc_sctp_do_rto_max,
 113                 .extra1         = &init_net.sctp.rto_min,
 114                 .extra2         = &timer_max
 115         },
 116         [SCTP_PF_RETRANS_IDX] = {
 117                 .procname       = "pf_retrans",
 118                 .data           = &init_net.sctp.pf_retrans,
 119                 .maxlen         = sizeof(int),
 120                 .mode           = 0644,
 121                 .proc_handler   = proc_dointvec_minmax,
 122                 .extra1         = SYSCTL_ZERO,
 123                 .extra2         = &init_net.sctp.ps_retrans,
 124         },
 125         [SCTP_PS_RETRANS_IDX] = {
 126                 .procname       = "ps_retrans",
 127                 .data           = &init_net.sctp.ps_retrans,
 128                 .maxlen         = sizeof(int),
 129                 .mode           = 0644,
 130                 .proc_handler   = proc_dointvec_minmax,
 131                 .extra1         = &init_net.sctp.pf_retrans,
 132                 .extra2         = &ps_retrans_max,
 133         },
 134         {
 135                 .procname       = "rto_initial",
 136                 .data           = &init_net.sctp.rto_initial,
 137                 .maxlen         = sizeof(unsigned int),
 138                 .mode           = 0644,
 139                 .proc_handler   = proc_dointvec_minmax,
 140                 .extra1         = SYSCTL_ONE,
 141                 .extra2         = &timer_max
 142         },
 143         {
 144                 .procname       = "rto_alpha_exp_divisor",
 145                 .data           = &init_net.sctp.rto_alpha,
 146                 .maxlen         = sizeof(int),
 147                 .mode           = 0644,
 148                 .proc_handler   = proc_sctp_do_alpha_beta,
 149                 .extra1         = &rto_alpha_min,
 150                 .extra2         = &rto_alpha_max,
 151         },
 152         {
 153                 .procname       = "rto_beta_exp_divisor",
 154                 .data           = &init_net.sctp.rto_beta,
 155                 .maxlen         = sizeof(int),
 156                 .mode           = 0644,
 157                 .proc_handler   = proc_sctp_do_alpha_beta,
 158                 .extra1         = &rto_beta_min,
 159                 .extra2         = &rto_beta_max,
 160         },
 161         {
 162                 .procname       = "max_burst",
 163                 .data           = &init_net.sctp.max_burst,
 164                 .maxlen         = sizeof(int),
 165                 .mode           = 0644,
 166                 .proc_handler   = proc_dointvec_minmax,
 167                 .extra1         = SYSCTL_ZERO,
 168                 .extra2         = SYSCTL_INT_MAX,
 169         },
 170         {
 171                 .procname       = "cookie_preserve_enable",
 172                 .data           = &init_net.sctp.cookie_preserve_enable,
 173                 .maxlen         = sizeof(int),
 174                 .mode           = 0644,
 175                 .proc_handler   = proc_dointvec,
 176         },
 177         {
 178                 .procname       = "cookie_hmac_alg",
 179                 .data           = &init_net.sctp.sctp_hmac_alg,
 180                 .maxlen         = 8,
 181                 .mode           = 0644,
 182                 .proc_handler   = proc_sctp_do_hmac_alg,
 183         },
 184         {
 185                 .procname       = "valid_cookie_life",
 186                 .data           = &init_net.sctp.valid_cookie_life,
 187                 .maxlen         = sizeof(unsigned int),
 188                 .mode           = 0644,
 189                 .proc_handler   = proc_dointvec_minmax,
 190                 .extra1         = SYSCTL_ONE,
 191                 .extra2         = &timer_max
 192         },
 193         {
 194                 .procname       = "sack_timeout",
 195                 .data           = &init_net.sctp.sack_timeout,
 196                 .maxlen         = sizeof(int),
 197                 .mode           = 0644,
 198                 .proc_handler   = proc_dointvec_minmax,
 199                 .extra1         = &sack_timer_min,
 200                 .extra2         = &sack_timer_max,
 201         },
 202         {
 203                 .procname       = "hb_interval",
 204                 .data           = &init_net.sctp.hb_interval,
 205                 .maxlen         = sizeof(unsigned int),
 206                 .mode           = 0644,
 207                 .proc_handler   = proc_dointvec_minmax,
 208                 .extra1         = SYSCTL_ONE,
 209                 .extra2         = &timer_max
 210         },
 211         {
 212                 .procname       = "association_max_retrans",
 213                 .data           = &init_net.sctp.max_retrans_association,
 214                 .maxlen         = sizeof(int),
 215                 .mode           = 0644,
 216                 .proc_handler   = proc_dointvec_minmax,
 217                 .extra1         = SYSCTL_ONE,
 218                 .extra2         = SYSCTL_INT_MAX,
 219         },
 220         {
 221                 .procname       = "path_max_retrans",
 222                 .data           = &init_net.sctp.max_retrans_path,
 223                 .maxlen         = sizeof(int),
 224                 .mode           = 0644,
 225                 .proc_handler   = proc_dointvec_minmax,
 226                 .extra1         = SYSCTL_ONE,
 227                 .extra2         = SYSCTL_INT_MAX,
 228         },
 229         {
 230                 .procname       = "max_init_retransmits",
 231                 .data           = &init_net.sctp.max_retrans_init,
 232                 .maxlen         = sizeof(int),
 233                 .mode           = 0644,
 234                 .proc_handler   = proc_dointvec_minmax,
 235                 .extra1         = SYSCTL_ONE,
 236                 .extra2         = SYSCTL_INT_MAX,
 237         },
 238         {
 239                 .procname       = "sndbuf_policy",
 240                 .data           = &init_net.sctp.sndbuf_policy,
 241                 .maxlen         = sizeof(int),
 242                 .mode           = 0644,
 243                 .proc_handler   = proc_dointvec,
 244         },
 245         {
 246                 .procname       = "rcvbuf_policy",
 247                 .data           = &init_net.sctp.rcvbuf_policy,
 248                 .maxlen         = sizeof(int),
 249                 .mode           = 0644,
 250                 .proc_handler   = proc_dointvec,
 251         },
 252         {
 253                 .procname       = "default_auto_asconf",
 254                 .data           = &init_net.sctp.default_auto_asconf,
 255                 .maxlen         = sizeof(int),
 256                 .mode           = 0644,
 257                 .proc_handler   = proc_dointvec,
 258         },
 259         {
 260                 .procname       = "addip_enable",
 261                 .data           = &init_net.sctp.addip_enable,
 262                 .maxlen         = sizeof(int),
 263                 .mode           = 0644,
 264                 .proc_handler   = proc_dointvec,
 265         },
 266         {
 267                 .procname       = "addip_noauth_enable",
 268                 .data           = &init_net.sctp.addip_noauth,
 269                 .maxlen         = sizeof(int),
 270                 .mode           = 0644,
 271                 .proc_handler   = proc_dointvec,
 272         },
 273         {
 274                 .procname       = "prsctp_enable",
 275                 .data           = &init_net.sctp.prsctp_enable,
 276                 .maxlen         = sizeof(int),
 277                 .mode           = 0644,
 278                 .proc_handler   = proc_dointvec,
 279         },
 280         {
 281                 .procname       = "reconf_enable",
 282                 .data           = &init_net.sctp.reconf_enable,
 283                 .maxlen         = sizeof(int),
 284                 .mode           = 0644,
 285                 .proc_handler   = proc_dointvec,
 286         },
 287         {
 288                 .procname       = "auth_enable",
 289                 .data           = &init_net.sctp.auth_enable,
 290                 .maxlen         = sizeof(int),
 291                 .mode           = 0644,
 292                 .proc_handler   = proc_sctp_do_auth,
 293         },
 294         {
 295                 .procname       = "intl_enable",
 296                 .data           = &init_net.sctp.intl_enable,
 297                 .maxlen         = sizeof(int),
 298                 .mode           = 0644,
 299                 .proc_handler   = proc_dointvec,
 300         },
 301         {
 302                 .procname       = "ecn_enable",
 303                 .data           = &init_net.sctp.ecn_enable,
 304                 .maxlen         = sizeof(int),
 305                 .mode           = 0644,
 306                 .proc_handler   = proc_dointvec,
 307         },
 308         {
 309                 .procname       = "plpmtud_probe_interval",
 310                 .data           = &init_net.sctp.probe_interval,
 311                 .maxlen         = sizeof(int),
 312                 .mode           = 0644,
 313                 .proc_handler   = proc_sctp_do_probe_interval,
 314         },
 315         {
 316                 .procname       = "udp_port",
 317                 .data           = &init_net.sctp.udp_port,
 318                 .maxlen         = sizeof(int),
 319                 .mode           = 0644,
 320                 .proc_handler   = proc_sctp_do_udp_port,
 321                 .extra1         = SYSCTL_ZERO,
 322                 .extra2         = &udp_port_max,
 323         },
 324         {
 325                 .procname       = "encap_port",
 326                 .data           = &init_net.sctp.encap_port,
 327                 .maxlen         = sizeof(int),
 328                 .mode           = 0644,
 329                 .proc_handler   = proc_dointvec_minmax,
 330                 .extra1         = SYSCTL_ZERO,
 331                 .extra2         = &udp_port_max,
 332         },
 333         {
 334                 .procname       = "addr_scope_policy",
 335                 .data           = &init_net.sctp.scope_policy,
 336                 .maxlen         = sizeof(int),
 337                 .mode           = 0644,
 338                 .proc_handler   = proc_dointvec_minmax,
 339                 .extra1         = SYSCTL_ZERO,
 340                 .extra2         = &addr_scope_max,
 341         },
 342         {
 343                 .procname       = "rwnd_update_shift",
 344                 .data           = &init_net.sctp.rwnd_upd_shift,
 345                 .maxlen         = sizeof(int),
 346                 .mode           = 0644,
 347                 .proc_handler   = &proc_dointvec_minmax,
 348                 .extra1         = SYSCTL_ONE,
 349                 .extra2         = &rwnd_scale_max,
 350         },
 351         {
 352                 .procname       = "max_autoclose",
 353                 .data           = &init_net.sctp.max_autoclose,
 354                 .maxlen         = sizeof(unsigned long),
 355                 .mode           = 0644,
 356                 .proc_handler   = &proc_doulongvec_minmax,
 357                 .extra1         = &max_autoclose_min,
 358                 .extra2         = &max_autoclose_max,
 359         },
 360 #ifdef CONFIG_NET_L3_MASTER_DEV
 361         {
 362                 .procname       = "l3mdev_accept",
 363                 .data           = &init_net.sctp.l3mdev_accept,
 364                 .maxlen         = sizeof(int),
 365                 .mode           = 0644,
 366                 .proc_handler   = proc_dointvec_minmax,
 367                 .extra1         = SYSCTL_ZERO,
 368                 .extra2         = SYSCTL_ONE,
 369         },
 370 #endif
 371         {
 372                 .procname       = "pf_enable",
 373                 .data           = &init_net.sctp.pf_enable,
 374                 .maxlen         = sizeof(int),
 375                 .mode           = 0644,
 376                 .proc_handler   = proc_dointvec,
 377         },
 378         {
 379                 .procname       = "pf_expose",
 380                 .data           = &init_net.sctp.pf_expose,
 381                 .maxlen         = sizeof(int),
 382                 .mode           = 0644,
 383                 .proc_handler   = proc_dointvec_minmax,
 384                 .extra1         = SYSCTL_ZERO,
 385                 .extra2         = &pf_expose_max,
 386         },
 387
 388         { /* sentinel */ }
 389 };
 390
 391 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
 392                                  void *buffer, size_t *lenp, loff_t *ppos)
 393 {
 394         struct net *net = current->nsproxy->net_ns;
 395         struct ctl_table tbl;
 396         bool changed = false;
 397         char *none = "none";
 398         char tmp[8] = {0};
 399         int ret;
 400
 401         memset(&tbl, 0, sizeof(struct ctl_table));
 402
 403         if (write) {
 404                 tbl.data = tmp;
 405                 tbl.maxlen = sizeof(tmp);
 406         } else {
 407                 tbl.data = net->sctp.sctp_hmac_alg ? : none;
 408                 tbl.maxlen = strlen(tbl.data);
 409         }
 410
 411         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 412         if (write && ret == 0) {
 413 #ifdef CONFIG_CRYPTO_MD5
 414                 if (!strncmp(tmp, "md5", 3)) {
 415                         net->sctp.sctp_hmac_alg = "md5";
 416                         changed = true;
 417                 }
 418 #endif
 419 #ifdef CONFIG_CRYPTO_SHA1
 420                 if (!strncmp(tmp, "sha1", 4)) {
 421                         net->sctp.sctp_hmac_alg = "sha1";
 422                         changed = true;
 423                 }
 424 #endif
 425                 if (!strncmp(tmp, "none", 4)) {
 426                         net->sctp.sctp_hmac_alg = NULL;
 427                         changed = true;
 428                 }
 429                 if (!changed)
 430                         ret = -EINVAL;
 431         }
 432
 433         return ret;
 434 }
 435
 436 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
 437                                 void *buffer, size_t *lenp, loff_t *ppos)
 438 {
 439         struct net *net = current->nsproxy->net_ns;
 440         unsigned int min = *(unsigned int *) ctl->extra1;
 441         unsigned int max = *(unsigned int *) ctl->extra2;
 442         struct ctl_table tbl;
 443         int ret, new_value;
 444
 445         memset(&tbl, 0, sizeof(struct ctl_table));
 446         tbl.maxlen = sizeof(unsigned int);
 447
 448         if (write)
 449                 tbl.data = &new_value;
 450         else
 451                 tbl.data = &net->sctp.rto_min;
 452
 453         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 454         if (write && ret == 0) {
 455                 if (new_value > max || new_value < min)
 456                         return -EINVAL;
 457
 458                 net->sctp.rto_min = new_value;
 459         }
 460
 461         return ret;
 462 }
 463
 464 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
 465                                 void *buffer, size_t *lenp, loff_t *ppos)
 466 {
 467         struct net *net = current->nsproxy->net_ns;
 468         unsigned int min = *(unsigned int *) ctl->extra1;
 469         unsigned int max = *(unsigned int *) ctl->extra2;
 470         struct ctl_table tbl;
 471         int ret, new_value;
 472
 473         memset(&tbl, 0, sizeof(struct ctl_table));
 474         tbl.maxlen = sizeof(unsigned int);
 475
 476         if (write)
 477                 tbl.data = &new_value;
 478         else
 479                 tbl.data = &net->sctp.rto_max;
 480
 481         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 482         if (write && ret == 0) {
 483                 if (new_value > max || new_value < min)
 484                         return -EINVAL;
 485
 486                 net->sctp.rto_max = new_value;
 487         }
 488
 489         return ret;
 490 }
 491
 492 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
 493                                    void *buffer, size_t *lenp, loff_t *ppos)
 494 {
 495         if (write)
 496                 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
 497                              "suboptimal rtt/srtt estimations!\n");
 498
 499         return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
 500 }
 501
 502 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
 503                              void *buffer, size_t *lenp, loff_t *ppos)
 504 {
 505         struct net *net = current->nsproxy->net_ns;
 506         struct ctl_table tbl;
 507         int new_value, ret;
 508
 509         memset(&tbl, 0, sizeof(struct ctl_table));
 510         tbl.maxlen = sizeof(unsigned int);
 511
 512         if (write)
 513                 tbl.data = &new_value;
 514         else
 515                 tbl.data = &net->sctp.auth_enable;
 516
 517         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 518         if (write && ret == 0) {
 519                 struct sock *sk = net->sctp.ctl_sock;
 520
 521                 net->sctp.auth_enable = new_value;
 522                 /* Update the value in the control socket */
 523                 lock_sock(sk);
 524                 sctp_sk(sk)->ep->auth_enable = new_value;
 525                 release_sock(sk);
 526         }
 527
 528         return ret;
 529 }
 530
 531 static int proc_sctp_do_udp_port(struct ctl_table *ctl, int write,
 532                                  void *buffer, size_t *lenp, loff_t *ppos)
 533 {
 534         struct net *net = current->nsproxy->net_ns;
 535         unsigned int min = *(unsigned int *)ctl->extra1;
 536         unsigned int max = *(unsigned int *)ctl->extra2;
 537         struct ctl_table tbl;
 538         int ret, new_value;
 539
 540         memset(&tbl, 0, sizeof(struct ctl_table));
 541         tbl.maxlen = sizeof(unsigned int);
 542
 543         if (write)
 544                 tbl.data = &new_value;
 545         else
 546                 tbl.data = &net->sctp.udp_port;
 547
 548         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 549         if (write && ret == 0) {
 550                 struct sock *sk = net->sctp.ctl_sock;
 551
 552                 if (new_value > max || new_value < min)
 553                         return -EINVAL;
 554
 555                 net->sctp.udp_port = new_value;
 556                 sctp_udp_sock_stop(net);
 557                 if (new_value) {
 558                         ret = sctp_udp_sock_start(net);
 559                         if (ret)
 560                                 net->sctp.udp_port = 0;
 561                 }
 562
 563                 /* Update the value in the control socket */
 564                 lock_sock(sk);
 565                 sctp_sk(sk)->udp_port = htons(net->sctp.udp_port);
 566                 release_sock(sk);
 567         }
 568
 569         return ret;
 570 }
 571
 572 static int proc_sctp_do_probe_interval(struct ctl_table *ctl, int write,
 573                                        void *buffer, size_t *lenp, loff_t *ppos)
 574 {
 575         struct net *net = current->nsproxy->net_ns;
 576         struct ctl_table tbl;
 577         int ret, new_value;
 578
 579         memset(&tbl, 0, sizeof(struct ctl_table));
 580         tbl.maxlen = sizeof(unsigned int);
 581
 582         if (write)
 583                 tbl.data = &new_value;
 584         else
 585                 tbl.data = &net->sctp.probe_interval;
 586
 587         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 588         if (write && ret == 0) {
 589                 if (new_value && new_value < SCTP_PROBE_TIMER_MIN)
 590                         return -EINVAL;
 591
 592                 net->sctp.probe_interval = new_value;
 593         }
 594
 595         return ret;
 596 }
 597
 598 int sctp_sysctl_net_register(struct net *net)
 599 {
 600         struct ctl_table *table;
 601         int i;
 602
 603         table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
 604         if (!table)
 605                 return -ENOMEM;
 606
 607         for (i = 0; table[i].data; i++)
 608                 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
 609
 610         table[SCTP_RTO_MIN_IDX].extra2 = &net->sctp.rto_max;
 611         table[SCTP_RTO_MAX_IDX].extra1 = &net->sctp.rto_min;
 612         table[SCTP_PF_RETRANS_IDX].extra2 = &net->sctp.ps_retrans;
 613         table[SCTP_PS_RETRANS_IDX].extra1 = &net->sctp.pf_retrans;
 614
 615         net->sctp.sysctl_header = register_net_sysctl_sz(net, "net/sctp",
 616                                                          table,
 617                                                          ARRAY_SIZE(sctp_net_table));
 618         if (net->sctp.sysctl_header == NULL) {
 619                 kfree(table);
 620                 return -ENOMEM;
 621         }
 622         return 0;
 623 }
 624
 625 void sctp_sysctl_net_unregister(struct net *net)
 626 {
 627         struct ctl_table *table;
 628
 629         table = net->sctp.sysctl_header->ctl_table_arg;
 630         unregister_net_sysctl_table(net->sctp.sysctl_header);
 631         kfree(table);
 632 }
 633
 634 static struct ctl_table_header *sctp_sysctl_header;
 635
 636 /* Sysctl registration.  */
 637 void sctp_sysctl_register(void)
 638 {
 639         sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
 640 }
 641
 642 /* Sysctl deregistration.  */
 643 void sctp_sysctl_unregister(void)
 644 {
 645         unregister_net_sysctl_table(sctp_sysctl_header);
 646 }