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 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
  62                                 void __user *buffer, size_t *lenp,
  63                                 loff_t *ppos);
  64 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
  65                                 void __user *buffer, size_t *lenp,
  66                                 loff_t *ppos);
  67 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
  68                                 void __user *buffer, size_t *lenp,
  69                                 loff_t *ppos);
  70 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
  71                                    void __user *buffer, size_t *lenp,
  72                                    loff_t *ppos);
  73 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
  74                              void __user *buffer, size_t *lenp,
  75                              loff_t *ppos);
  76
  77 static struct ctl_table sctp_table[] = {
  78         {
  79                 .procname       = "sctp_mem",
  80                 .data           = &sysctl_sctp_mem,
  81                 .maxlen         = sizeof(sysctl_sctp_mem),
  82                 .mode           = 0644,
  83                 .proc_handler   = proc_doulongvec_minmax
  84         },
  85         {
  86                 .procname       = "sctp_rmem",
  87                 .data           = &sysctl_sctp_rmem,
  88                 .maxlen         = sizeof(sysctl_sctp_rmem),
  89                 .mode           = 0644,
  90                 .proc_handler   = proc_dointvec,
  91         },
  92         {
  93                 .procname       = "sctp_wmem",
  94                 .data           = &sysctl_sctp_wmem,
  95                 .maxlen         = sizeof(sysctl_sctp_wmem),
  96                 .mode           = 0644,
  97                 .proc_handler   = proc_dointvec,
  98         },
  99
 100         { /* sentinel */ }
 101 };
 102
 103 static struct ctl_table sctp_net_table[] = {
 104         {
 105                 .procname       = "rto_initial",
 106                 .data           = &init_net.sctp.rto_initial,
 107                 .maxlen         = sizeof(unsigned int),
 108                 .mode           = 0644,
 109                 .proc_handler   = proc_dointvec_minmax,
 110                 .extra1         = &one,
 111                 .extra2         = &timer_max
 112         },
 113         {
 114                 .procname       = "rto_min",
 115                 .data           = &init_net.sctp.rto_min,
 116                 .maxlen         = sizeof(unsigned int),
 117                 .mode           = 0644,
 118                 .proc_handler   = proc_sctp_do_rto_min,
 119                 .extra1         = &one,
 120                 .extra2         = &init_net.sctp.rto_max
 121         },
 122         {
 123                 .procname       = "rto_max",
 124                 .data           = &init_net.sctp.rto_max,
 125                 .maxlen         = sizeof(unsigned int),
 126                 .mode           = 0644,
 127                 .proc_handler   = proc_sctp_do_rto_max,
 128                 .extra1         = &init_net.sctp.rto_min,
 129                 .extra2         = &timer_max
 130         },
 131         {
 132                 .procname       = "rto_alpha_exp_divisor",
 133                 .data           = &init_net.sctp.rto_alpha,
 134                 .maxlen         = sizeof(int),
 135                 .mode           = 0644,
 136                 .proc_handler   = proc_sctp_do_alpha_beta,
 137                 .extra1         = &rto_alpha_min,
 138                 .extra2         = &rto_alpha_max,
 139         },
 140         {
 141                 .procname       = "rto_beta_exp_divisor",
 142                 .data           = &init_net.sctp.rto_beta,
 143                 .maxlen         = sizeof(int),
 144                 .mode           = 0644,
 145                 .proc_handler   = proc_sctp_do_alpha_beta,
 146                 .extra1         = &rto_beta_min,
 147                 .extra2         = &rto_beta_max,
 148         },
 149         {
 150                 .procname       = "max_burst",
 151                 .data           = &init_net.sctp.max_burst,
 152                 .maxlen         = sizeof(int),
 153                 .mode           = 0644,
 154                 .proc_handler   = proc_dointvec_minmax,
 155                 .extra1         = &zero,
 156                 .extra2         = &int_max
 157         },
 158         {
 159                 .procname       = "cookie_preserve_enable",
 160                 .data           = &init_net.sctp.cookie_preserve_enable,
 161                 .maxlen         = sizeof(int),
 162                 .mode           = 0644,
 163                 .proc_handler   = proc_dointvec,
 164         },
 165         {
 166                 .procname       = "cookie_hmac_alg",
 167                 .data           = &init_net.sctp.sctp_hmac_alg,
 168                 .maxlen         = 8,
 169                 .mode           = 0644,
 170                 .proc_handler   = proc_sctp_do_hmac_alg,
 171         },
 172         {
 173                 .procname       = "valid_cookie_life",
 174                 .data           = &init_net.sctp.valid_cookie_life,
 175                 .maxlen         = sizeof(unsigned int),
 176                 .mode           = 0644,
 177                 .proc_handler   = proc_dointvec_minmax,
 178                 .extra1         = &one,
 179                 .extra2         = &timer_max
 180         },
 181         {
 182                 .procname       = "sack_timeout",
 183                 .data           = &init_net.sctp.sack_timeout,
 184                 .maxlen         = sizeof(int),
 185                 .mode           = 0644,
 186                 .proc_handler   = proc_dointvec_minmax,
 187                 .extra1         = &sack_timer_min,
 188                 .extra2         = &sack_timer_max,
 189         },
 190         {
 191                 .procname       = "hb_interval",
 192                 .data           = &init_net.sctp.hb_interval,
 193                 .maxlen         = sizeof(unsigned int),
 194                 .mode           = 0644,
 195                 .proc_handler   = proc_dointvec_minmax,
 196                 .extra1         = &one,
 197                 .extra2         = &timer_max
 198         },
 199         {
 200                 .procname       = "association_max_retrans",
 201                 .data           = &init_net.sctp.max_retrans_association,
 202                 .maxlen         = sizeof(int),
 203                 .mode           = 0644,
 204                 .proc_handler   = proc_dointvec_minmax,
 205                 .extra1         = &one,
 206                 .extra2         = &int_max
 207         },
 208         {
 209                 .procname       = "path_max_retrans",
 210                 .data           = &init_net.sctp.max_retrans_path,
 211                 .maxlen         = sizeof(int),
 212                 .mode           = 0644,
 213                 .proc_handler   = proc_dointvec_minmax,
 214                 .extra1         = &one,
 215                 .extra2         = &int_max
 216         },
 217         {
 218                 .procname       = "max_init_retransmits",
 219                 .data           = &init_net.sctp.max_retrans_init,
 220                 .maxlen         = sizeof(int),
 221                 .mode           = 0644,
 222                 .proc_handler   = proc_dointvec_minmax,
 223                 .extra1         = &one,
 224                 .extra2         = &int_max
 225         },
 226         {
 227                 .procname       = "pf_retrans",
 228                 .data           = &init_net.sctp.pf_retrans,
 229                 .maxlen         = sizeof(int),
 230                 .mode           = 0644,
 231                 .proc_handler   = proc_dointvec_minmax,
 232                 .extra1         = &zero,
 233                 .extra2         = &int_max
 234         },
 235         {
 236                 .procname       = "sndbuf_policy",
 237                 .data           = &init_net.sctp.sndbuf_policy,
 238                 .maxlen         = sizeof(int),
 239                 .mode           = 0644,
 240                 .proc_handler   = proc_dointvec,
 241         },
 242         {
 243                 .procname       = "rcvbuf_policy",
 244                 .data           = &init_net.sctp.rcvbuf_policy,
 245                 .maxlen         = sizeof(int),
 246                 .mode           = 0644,
 247                 .proc_handler   = proc_dointvec,
 248         },
 249         {
 250                 .procname       = "default_auto_asconf",
 251                 .data           = &init_net.sctp.default_auto_asconf,
 252                 .maxlen         = sizeof(int),
 253                 .mode           = 0644,
 254                 .proc_handler   = proc_dointvec,
 255         },
 256         {
 257                 .procname       = "addip_enable",
 258                 .data           = &init_net.sctp.addip_enable,
 259                 .maxlen         = sizeof(int),
 260                 .mode           = 0644,
 261                 .proc_handler   = proc_dointvec,
 262         },
 263         {
 264                 .procname       = "addip_noauth_enable",
 265                 .data           = &init_net.sctp.addip_noauth,
 266                 .maxlen         = sizeof(int),
 267                 .mode           = 0644,
 268                 .proc_handler   = proc_dointvec,
 269         },
 270         {
 271                 .procname       = "prsctp_enable",
 272                 .data           = &init_net.sctp.prsctp_enable,
 273                 .maxlen         = sizeof(int),
 274                 .mode           = 0644,
 275                 .proc_handler   = proc_dointvec,
 276         },
 277         {
 278                 .procname       = "reconf_enable",
 279                 .data           = &init_net.sctp.reconf_enable,
 280                 .maxlen         = sizeof(int),
 281                 .mode           = 0644,
 282                 .proc_handler   = proc_dointvec,
 283         },
 284         {
 285                 .procname       = "auth_enable",
 286                 .data           = &init_net.sctp.auth_enable,
 287                 .maxlen         = sizeof(int),
 288                 .mode           = 0644,
 289                 .proc_handler   = proc_sctp_do_auth,
 290         },
 291         {
 292                 .procname       = "addr_scope_policy",
 293                 .data           = &init_net.sctp.scope_policy,
 294                 .maxlen         = sizeof(int),
 295                 .mode           = 0644,
 296                 .proc_handler   = proc_dointvec_minmax,
 297                 .extra1         = &zero,
 298                 .extra2         = &addr_scope_max,
 299         },
 300         {
 301                 .procname       = "rwnd_update_shift",
 302                 .data           = &init_net.sctp.rwnd_upd_shift,
 303                 .maxlen         = sizeof(int),
 304                 .mode           = 0644,
 305                 .proc_handler   = &proc_dointvec_minmax,
 306                 .extra1         = &one,
 307                 .extra2         = &rwnd_scale_max,
 308         },
 309         {
 310                 .procname       = "max_autoclose",
 311                 .data           = &init_net.sctp.max_autoclose,
 312                 .maxlen         = sizeof(unsigned long),
 313                 .mode           = 0644,
 314                 .proc_handler   = &proc_doulongvec_minmax,
 315                 .extra1         = &max_autoclose_min,
 316                 .extra2         = &max_autoclose_max,
 317         },
 318         {
 319                 .procname       = "pf_enable",
 320                 .data           = &init_net.sctp.pf_enable,
 321                 .maxlen         = sizeof(int),
 322                 .mode           = 0644,
 323                 .proc_handler   = proc_dointvec,
 324         },
 325
 326         { /* sentinel */ }
 327 };
 328
 329 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
 330                                 void __user *buffer, size_t *lenp,
 331                                 loff_t *ppos)
 332 {
 333         struct net *net = current->nsproxy->net_ns;
 334         struct ctl_table tbl;
 335         bool changed = false;
 336         char *none = "none";
 337         char tmp[8] = {0};
 338         int ret;
 339
 340         memset(&tbl, 0, sizeof(struct ctl_table));
 341
 342         if (write) {
 343                 tbl.data = tmp;
 344                 tbl.maxlen = sizeof(tmp);
 345         } else {
 346                 tbl.data = net->sctp.sctp_hmac_alg ? : none;
 347                 tbl.maxlen = strlen(tbl.data);
 348         }
 349
 350         ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 351         if (write && ret == 0) {
 352 #ifdef CONFIG_CRYPTO_MD5
 353                 if (!strncmp(tmp, "md5", 3)) {
 354                         net->sctp.sctp_hmac_alg = "md5";
 355                         changed = true;
 356                 }
 357 #endif
 358 #ifdef CONFIG_CRYPTO_SHA1
 359                 if (!strncmp(tmp, "sha1", 4)) {
 360                         net->sctp.sctp_hmac_alg = "sha1";
 361                         changed = true;
 362                 }
 363 #endif
 364                 if (!strncmp(tmp, "none", 4)) {
 365                         net->sctp.sctp_hmac_alg = NULL;
 366                         changed = true;
 367                 }
 368                 if (!changed)
 369                         ret = -EINVAL;
 370         }
 371
 372         return ret;
 373 }
 374
 375 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
 376                                 void __user *buffer, size_t *lenp,
 377                                 loff_t *ppos)
 378 {
 379         struct net *net = current->nsproxy->net_ns;
 380         unsigned int min = *(unsigned int *) ctl->extra1;
 381         unsigned int max = *(unsigned int *) ctl->extra2;
 382         struct ctl_table tbl;
 383         int ret, new_value;
 384
 385         memset(&tbl, 0, sizeof(struct ctl_table));
 386         tbl.maxlen = sizeof(unsigned int);
 387
 388         if (write)
 389                 tbl.data = &new_value;
 390         else
 391                 tbl.data = &net->sctp.rto_min;
 392
 393         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 394         if (write && ret == 0) {
 395                 if (new_value > max || new_value < min)
 396                         return -EINVAL;
 397
 398                 net->sctp.rto_min = new_value;
 399         }
 400
 401         return ret;
 402 }
 403
 404 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
 405                                 void __user *buffer, size_t *lenp,
 406                                 loff_t *ppos)
 407 {
 408         struct net *net = current->nsproxy->net_ns;
 409         unsigned int min = *(unsigned int *) ctl->extra1;
 410         unsigned int max = *(unsigned int *) ctl->extra2;
 411         struct ctl_table tbl;
 412         int ret, new_value;
 413
 414         memset(&tbl, 0, sizeof(struct ctl_table));
 415         tbl.maxlen = sizeof(unsigned int);
 416
 417         if (write)
 418                 tbl.data = &new_value;
 419         else
 420                 tbl.data = &net->sctp.rto_max;
 421
 422         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 423         if (write && ret == 0) {
 424                 if (new_value > max || new_value < min)
 425                         return -EINVAL;
 426
 427                 net->sctp.rto_max = new_value;
 428         }
 429
 430         return ret;
 431 }
 432
 433 static int proc_sctp_do_alpha_beta(struct ctl_table *ctl, int write,
 434                                    void __user *buffer, size_t *lenp,
 435                                    loff_t *ppos)
 436 {
 437         if (write)
 438                 pr_warn_once("Changing rto_alpha or rto_beta may lead to "
 439                              "suboptimal rtt/srtt estimations!\n");
 440
 441         return proc_dointvec_minmax(ctl, write, buffer, lenp, ppos);
 442 }
 443
 444 static int proc_sctp_do_auth(struct ctl_table *ctl, int write,
 445                              void __user *buffer, size_t *lenp,
 446                              loff_t *ppos)
 447 {
 448         struct net *net = current->nsproxy->net_ns;
 449         struct ctl_table tbl;
 450         int new_value, ret;
 451
 452         memset(&tbl, 0, sizeof(struct ctl_table));
 453         tbl.maxlen = sizeof(unsigned int);
 454
 455         if (write)
 456                 tbl.data = &new_value;
 457         else
 458                 tbl.data = &net->sctp.auth_enable;
 459
 460         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 461         if (write && ret == 0) {
 462                 struct sock *sk = net->sctp.ctl_sock;
 463
 464                 net->sctp.auth_enable = new_value;
 465                 /* Update the value in the control socket */
 466                 lock_sock(sk);
 467                 sctp_sk(sk)->ep->auth_enable = new_value;
 468                 release_sock(sk);
 469         }
 470
 471         return ret;
 472 }
 473
 474 int sctp_sysctl_net_register(struct net *net)
 475 {
 476         struct ctl_table *table;
 477         int i;
 478
 479         table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
 480         if (!table)
 481                 return -ENOMEM;
 482
 483         for (i = 0; table[i].data; i++)
 484                 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
 485
 486         net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
 487         if (net->sctp.sysctl_header == NULL) {
 488                 kfree(table);
 489                 return -ENOMEM;
 490         }
 491         return 0;
 492 }
 493
 494 void sctp_sysctl_net_unregister(struct net *net)
 495 {
 496         struct ctl_table *table;
 497
 498         table = net->sctp.sysctl_header->ctl_table_arg;
 499         unregister_net_sysctl_table(net->sctp.sysctl_header);
 500         kfree(table);
 501 }
 502
 503 static struct ctl_table_header *sctp_sysctl_header;
 504
 505 /* Sysctl registration.  */
 506 void sctp_sysctl_register(void)
 507 {
 508         sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
 509 }
 510
 511 /* Sysctl deregistration.  */
 512 void sctp_sysctl_unregister(void)
 513 {
 514         unregister_net_sysctl_table(sctp_sysctl_header);
 515 }