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