net/sctp/sysctl.c

   1 /* SCTP kernel implementation
   2  * (C) Copyright IBM Corp. 2002, 2004
   3  * Copyright (c) 2002 Intel Corp.
   4  *
   5  * This file is part of the SCTP kernel implementation
   6  *
   7  * Sysctl related interfaces for SCTP.
   8  *
   9  * This SCTP implementation is free software;
  10  * you can redistribute it and/or modify it under the terms of
  11  * the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * This SCTP implementation is distributed in the hope that it
  16  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  17  *                 ************************
  18  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  19  * See the GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with GNU CC; see the file COPYING.  If not, see
  23  * <http://www.gnu.org/licenses/>.
  24  *
  25  * Please send any bug reports or fixes you make to the
  26  * email address(es):
  27  *    lksctp developers <linux-sctp@vger.kernel.org>
  28  *
  29  * Written or modified by:
  30  *    Mingqin Liu           <liuming@us.ibm.com>
  31  *    Jon Grimm             <jgrimm@us.ibm.com>
  32  *    Ardelle Fan           <ardelle.fan@intel.com>
  33  *    Ryan Layer            <rmlayer@us.ibm.com>
  34  *    Sridhar Samudrala     <sri@us.ibm.com>
  35  */
  36
  37 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  38
  39 #include <net/sctp/structs.h>
  40 #include <net/sctp/sctp.h>
  41 #include <linux/sysctl.h>
  42
  43 static int zero = 0;
  44 static int one = 1;
  45 static int timer_max = 86400000; /* ms in one day */
  46 static int int_max = INT_MAX;
  47 static int sack_timer_min = 1;
  48 static int sack_timer_max = 500;
  49 static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
  50 static int rwnd_scale_max = 16;
  51 static int rto_alpha_min = 0;
  52 static int rto_beta_min = 0;
  53 static int rto_alpha_max = 1000;
  54 static int rto_beta_max = 1000;
  55
  56 static unsigned long max_autoclose_min = 0;
  57 static unsigned long max_autoclose_max =
  58         (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
  59         ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
  60
  61 extern long sysctl_sctp_mem[3];
  62 extern int sysctl_sctp_rmem[3];
  63 extern int sysctl_sctp_wmem[3];
  64
  65 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
  66                                 void __user *buffer, size_t *lenp,
  67                                 loff_t *ppos);
  68 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
  69                                 void __user *buffer, size_t *lenp,
  70                                 loff_t *ppos);
  71 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
  72                                 void __user *buffer, size_t *lenp,
  73                                 loff_t *ppos);
  74 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
  75                                    void __user *buffer, size_t *lenp,
  76                                    loff_t *ppos);
  77 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
  78                              void __user *buffer, size_t *lenp,
  79                              loff_t *ppos);
  80
  81 static struct ctl_table sctp_table[] = {
  82         {
  83                 .procname       = "sctp_mem",
  84                 .data           = &sysctl_sctp_mem,
  85                 .maxlen         = sizeof(sysctl_sctp_mem),
  86                 .mode           = 0644,
  87                 .proc_handler   = proc_doulongvec_minmax
  88         },
  89         {
  90                 .procname       = "sctp_rmem",
  91                 .data           = &sysctl_sctp_rmem,
  92                 .maxlen         = sizeof(sysctl_sctp_rmem),
  93                 .mode           = 0644,
  94                 .proc_handler   = proc_dointvec,
  95         },
  96         {
  97                 .procname       = "sctp_wmem",
  98                 .data           = &sysctl_sctp_wmem,
  99                 .maxlen         = sizeof(sysctl_sctp_wmem),
 100                 .mode           = 0644,
 101                 .proc_handler   = proc_dointvec,
 102         },
 103
 104         { /* sentinel */ }
 105 };
 106
 107 static struct ctl_table sctp_net_table[] = {
 108         {
 109                 .procname       = "rto_initial",
 110                 .data           = &init_net.sctp.rto_initial,
 111                 .maxlen         = sizeof(unsigned int),
 112                 .mode           = 0644,
 113                 .proc_handler   = proc_dointvec_minmax,
 114                 .extra1         = &one,
 115                 .extra2         = &timer_max
 116         },
 117         {
 118                 .procname       = "rto_min",
 119                 .data           = &init_net.sctp.rto_min,
 120                 .maxlen         = sizeof(unsigned int),
 121                 .mode           = 0644,
 122                 .proc_handler   = proc_sctp_do_rto_min,
 123                 .extra1         = &one,
 124                 .extra2         = &init_net.sctp.rto_max
 125         },
 126         {
 127                 .procname       = "rto_max",
 128                 .data           = &init_net.sctp.rto_max,
 129                 .maxlen         = sizeof(unsigned int),
 130                 .mode           = 0644,
 131                 .proc_handler   = proc_sctp_do_rto_max,
 132                 .extra1         = &init_net.sctp.rto_min,
 133                 .extra2         = &timer_max
 134         },
 135         {
 136                 .procname       = "rto_alpha_exp_divisor",
 137                 .data           = &init_net.sctp.rto_alpha,
 138                 .maxlen         = sizeof(int),
 139                 .mode           = 0644,
 140                 .proc_handler   = proc_sctp_do_alpha_beta,
 141                 .extra1         = &rto_alpha_min,
 142                 .extra2         = &rto_alpha_max,
 143         },
 144         {
 145                 .procname       = "rto_beta_exp_divisor",
 146                 .data           = &init_net.sctp.rto_beta,
 147                 .maxlen         = sizeof(int),
 148                 .mode           = 0644,
 149                 .proc_handler   = proc_sctp_do_alpha_beta,
 150                 .extra1         = &rto_beta_min,
 151                 .extra2         = &rto_beta_max,
 152         },
 153         {
 154                 .procname       = "max_burst",
 155                 .data           = &init_net.sctp.max_burst,
 156                 .maxlen         = sizeof(int),
 157                 .mode           = 0644,
 158                 .proc_handler   = proc_dointvec_minmax,
 159                 .extra1         = &zero,
 160                 .extra2         = &int_max
 161         },
 162         {
 163                 .procname       = "cookie_preserve_enable",
 164                 .data           = &init_net.sctp.cookie_preserve_enable,
 165                 .maxlen         = sizeof(int),
 166                 .mode           = 0644,
 167                 .proc_handler   = proc_dointvec,
 168         },
 169         {
 170                 .procname       = "cookie_hmac_alg",
 171                 .data           = &init_net.sctp.sctp_hmac_alg,
 172                 .maxlen         = 8,
 173                 .mode           = 0644,
 174                 .proc_handler   = proc_sctp_do_hmac_alg,
 175         },
 176         {
 177                 .procname       = "valid_cookie_life",
 178                 .data           = &init_net.sctp.valid_cookie_life,
 179                 .maxlen         = sizeof(unsigned int),
 180                 .mode           = 0644,
 181                 .proc_handler   = proc_dointvec_minmax,
 182                 .extra1         = &one,
 183                 .extra2         = &timer_max
 184         },
 185         {
 186                 .procname       = "sack_timeout",
 187                 .data           = &init_net.sctp.sack_timeout,
 188                 .maxlen         = sizeof(int),
 189                 .mode           = 0644,
 190                 .proc_handler   = proc_dointvec_minmax,
 191                 .extra1         = &sack_timer_min,
 192                 .extra2         = &sack_timer_max,
 193         },
 194         {
 195                 .procname       = "hb_interval",
 196                 .data           = &init_net.sctp.hb_interval,
 197                 .maxlen         = sizeof(unsigned int),
 198                 .mode           = 0644,
 199                 .proc_handler   = proc_dointvec_minmax,
 200                 .extra1         = &one,
 201                 .extra2         = &timer_max
 202         },
 203         {
 204                 .procname       = "association_max_retrans",
 205                 .data           = &init_net.sctp.max_retrans_association,
 206                 .maxlen         = sizeof(int),
 207                 .mode           = 0644,
 208                 .proc_handler   = proc_dointvec_minmax,
 209                 .extra1         = &one,
 210                 .extra2         = &int_max
 211         },
 212         {
 213                 .procname       = "path_max_retrans",
 214                 .data           = &init_net.sctp.max_retrans_path,
 215                 .maxlen         = sizeof(int),
 216                 .mode           = 0644,
 217                 .proc_handler   = proc_dointvec_minmax,
 218                 .extra1         = &one,
 219                 .extra2         = &int_max
 220         },
 221         {
 222                 .procname       = "max_init_retransmits",
 223                 .data           = &init_net.sctp.max_retrans_init,
 224                 .maxlen         = sizeof(int),
 225                 .mode           = 0644,
 226                 .proc_handler   = proc_dointvec_minmax,
 227                 .extra1         = &one,
 228                 .extra2         = &int_max
 229         },
 230         {
 231                 .procname       = "pf_retrans",
 232                 .data           = &init_net.sctp.pf_retrans,
 233                 .maxlen         = sizeof(int),
 234                 .mode           = 0644,
 235                 .proc_handler   = proc_dointvec_minmax,
 236                 .extra1         = &zero,
 237                 .extra2         = &int_max
 238         },
 239         {
 240                 .procname       = "sndbuf_policy",
 241                 .data           = &init_net.sctp.sndbuf_policy,
 242                 .maxlen         = sizeof(int),
 243                 .mode           = 0644,
 244                 .proc_handler   = proc_dointvec,
 245         },
 246         {
 247                 .procname       = "rcvbuf_policy",
 248                 .data           = &init_net.sctp.rcvbuf_policy,
 249                 .maxlen         = sizeof(int),
 250                 .mode           = 0644,
 251                 .proc_handler   = proc_dointvec,
 252         },
 253         {
 254                 .procname       = "default_auto_asconf",
 255                 .data           = &init_net.sctp.default_auto_asconf,
 256                 .maxlen         = sizeof(int),
 257                 .mode           = 0644,
 258                 .proc_handler   = proc_dointvec,
 259         },
 260         {
 261                 .procname       = "addip_enable",
 262                 .data           = &init_net.sctp.addip_enable,
 263                 .maxlen         = sizeof(int),
 264                 .mode           = 0644,
 265                 .proc_handler   = proc_dointvec,
 266         },
 267         {
 268                 .procname       = "addip_noauth_enable",
 269                 .data           = &init_net.sctp.addip_noauth,
 270                 .maxlen         = sizeof(int),
 271                 .mode           = 0644,
 272                 .proc_handler   = proc_dointvec,
 273         },
 274         {
 275                 .procname       = "prsctp_enable",
 276                 .data           = &init_net.sctp.prsctp_enable,
 277                 .maxlen         = sizeof(int),
 278                 .mode           = 0644,
 279                 .proc_handler   = proc_dointvec,
 280         },
 281         {
 282                 .procname       = "auth_enable",
 283                 .data           = &init_net.sctp.auth_enable,
 284                 .maxlen         = sizeof(int),
 285                 .mode           = 0644,
 286                 .proc_handler   = proc_sctp_do_auth,
 287         },
 288         {
 289                 .procname       = "addr_scope_policy",
 290                 .data           = &init_net.sctp.scope_policy,
 291                 .maxlen         = sizeof(int),
 292                 .mode           = 0644,
 293                 .proc_handler   = proc_dointvec_minmax,
 294                 .extra1         = &zero,
 295                 .extra2         = &addr_scope_max,
 296         },
 297         {
 298                 .procname       = "rwnd_update_shift",
 299                 .data           = &init_net.sctp.rwnd_upd_shift,
 300                 .maxlen         = sizeof(int),
 301                 .mode           = 0644,
 302                 .proc_handler   = &proc_dointvec_minmax,
 303                 .extra1         = &one,
 304                 .extra2         = &rwnd_scale_max,
 305         },
 306         {
 307                 .procname       = "max_autoclose",
 308                 .data           = &init_net.sctp.max_autoclose,
 309                 .maxlen         = sizeof(unsigned long),
 310                 .mode           = 0644,
 311                 .proc_handler   = &proc_doulongvec_minmax,
 312                 .extra1         = &max_autoclose_min,
 313                 .extra2         = &max_autoclose_max,
 314         },
 315
 316         { /* sentinel */ }
 317 };
 318
 319 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
 320                                 void __user *buffer, size_t *lenp,
 321                                 loff_t *ppos)
 322 {
 323         struct net *net = current->nsproxy->net_ns;
 324         struct ctl_table tbl;
 325         bool changed = false;
 326         char *none = "none";
 327         char tmp[8];
 328         int ret;
 329
 330         memset(&tbl, 0, sizeof(struct ctl_table));
 331
 332         if (write) {
 333                 tbl.data = tmp;
 334                 tbl.maxlen = sizeof(tmp);
 335         } else {
 336                 tbl.data = net->sctp.sctp_hmac_alg ? : none;
 337                 tbl.maxlen = strlen(tbl.data);
 338         }
 339
 340         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 341         if (write && ret == 0) {
 342 #ifdef CONFIG_CRYPTO_MD5
 343                 if (!strncmp(tmp, "md5", 3)) {
 344                         net->sctp.sctp_hmac_alg = "md5";
 345                         changed = true;
 346                 }
 347 #endif
 348 #ifdef CONFIG_CRYPTO_SHA1
 349                 if (!strncmp(tmp, "sha1", 4)) {
 350                         net->sctp.sctp_hmac_alg = "sha1";
 351                         changed = true;
 352                 }
 353 #endif
 354                 if (!strncmp(tmp, "none", 4)) {
 355                         net->sctp.sctp_hmac_alg = NULL;
 356                         changed = true;
 357                 }
 358                 if (!changed)
 359                         ret = -EINVAL;
 360         }
 361
 362         return ret;
 363 }
 364
 365 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
 366                                 void __user *buffer, size_t *lenp,
 367                                 loff_t *ppos)
 368 {
 369         struct net *net = current->nsproxy->net_ns;
 370         unsigned int min = *(unsigned int *) ctl->extra1;
 371         unsigned int max = *(unsigned int *) ctl->extra2;
 372         struct ctl_table tbl;
 373         int ret, new_value;
 374
 375         memset(&tbl, 0, sizeof(struct ctl_table));
 376         tbl.maxlen = sizeof(unsigned int);
 377
 378         if (write)
 379                 tbl.data = &new_value;
 380         else
 381                 tbl.data = &net->sctp.rto_min;
 382
 383         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 384         if (write && ret == 0) {
 385                 if (new_value > max || new_value < min)
 386                         return -EINVAL;
 387
 388                 net->sctp.rto_min = new_value;
 389         }
 390
 391         return ret;
 392 }
 393
 394 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
 395                                 void __user *buffer, size_t *lenp,
 396                                 loff_t *ppos)
 397 {
 398         struct net *net = current->nsproxy->net_ns;
 399         unsigned int min = *(unsigned int *) ctl->extra1;
 400         unsigned int max = *(unsigned int *) ctl->extra2;
 401         struct ctl_table tbl;
 402         int ret, new_value;
 403
 404         memset(&tbl, 0, sizeof(struct ctl_table));
 405         tbl.maxlen = sizeof(unsigned int);
 406
 407         if (write)
 408                 tbl.data = &new_value;
 409         else
 410                 tbl.data = &net->sctp.rto_max;
 411
 412         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 413         if (write && ret == 0) {
 414                 if (new_value > max || new_value < min)
 415                         return -EINVAL;
 416
 417                 net->sctp.rto_max = new_value;
 418         }
 419
 420         return ret;
 421 }
 422
 423 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
 424                                    void __user *buffer, size_t *lenp,
 425                                    loff_t *ppos)
 426 {
 427         pr_warn_once("Changing rto_alpha or rto_beta may lead to "
 428                      "suboptimal rtt/srtt estimations!\n");
 429
 430         return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
 431 }
 432
 433 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
 434                              void __user *buffer, size_t *lenp,
 435                              loff_t *ppos)
 436 {
 437         struct net *net = current->nsproxy->net_ns;
 438         struct ctl_table tbl;
 439         int new_value, ret;
 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.auth_enable;
 448
 449         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 450         if (write && ret == 0) {
 451                 struct sock *sk = net->sctp.ctl_sock;
 452
 453                 net->sctp.auth_enable = new_value;
 454                 /* Update the value in the control socket */
 455                 lock_sock(sk);
 456                 sctp_sk(sk)->ep->auth_enable = new_value;
 457                 release_sock(sk);
 458         }
 459
 460         return ret;
 461 }
 462
 463 int sctp_sysctl_net_register(struct net *net)
 464 {
 465         struct ctl_table *table;
 466         int i;
 467
 468         table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
 469         if (!table)
 470                 return -ENOMEM;
 471
 472         for (i = 0; table[i].data; i++)
 473                 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
 474
 475         net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
 476         if (net->sctp.sysctl_header == NULL) {
 477                 kfree(table);
 478                 return -ENOMEM;
 479         }
 480         return 0;
 481 }
 482
 483 void sctp_sysctl_net_unregister(struct net *net)
 484 {
 485         struct ctl_table *table;
 486
 487         table = net->sctp.sysctl_header->ctl_table_arg;
 488         unregister_net_sysctl_table(net->sctp.sysctl_header);
 489         kfree(table);
 490 }
 491
 492 static struct ctl_table_header *sctp_sysctl_header;
 493
 494 /* Sysctl registration.  */
 495 void sctp_sysctl_register(void)
 496 {
 497         sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
 498 }
 499
 500 /* Sysctl deregistration.  */
 501 void sctp_sysctl_unregister(void)
 502 {
 503         unregister_net_sysctl_table(sctp_sysctl_header);
 504 }