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, write to
  23  * the Free Software Foundation, 59 Temple Place - Suite 330,
  24  * Boston, MA 02111-1307, USA.
  25  *
  26  * Please send any bug reports or fixes you make to the
  27  * email address(es):
  28  *    lksctp developers <linux-sctp@vger.kernel.org>
  29  *
  30  * Written or modified by:
  31  *    Mingqin Liu           <liuming@us.ibm.com>
  32  *    Jon Grimm             <jgrimm@us.ibm.com>
  33  *    Ardelle Fan           <ardelle.fan@intel.com>
  34  *    Ryan Layer            <rmlayer@us.ibm.com>
  35  *    Sridhar Samudrala     <sri@us.ibm.com>
  36  */
  37
  38 #include <net/sctp/structs.h>
  39 #include <net/sctp/sctp.h>
  40 #include <linux/sysctl.h>
  41
  42 static int zero = 0;
  43 static int one = 1;
  44 static int timer_max = 86400000; /* ms in one day */
  45 static int int_max = INT_MAX;
  46 static int sack_timer_min = 1;
  47 static int sack_timer_max = 500;
  48 static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
  49 static int rwnd_scale_max = 16;
  50 static unsigned long max_autoclose_min = 0;
  51 static unsigned long max_autoclose_max =
  52         (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
  53         ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
  54
  55 extern long sysctl_sctp_mem[3];
  56 extern int sysctl_sctp_rmem[3];
  57 extern int sysctl_sctp_wmem[3];
  58
  59 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
  60                                 void __user *buffer, size_t *lenp,
  61                                 loff_t *ppos);
  62 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
  63                                 void __user *buffer, size_t *lenp,
  64                                 loff_t *ppos);
  65 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
  66                                 void __user *buffer, size_t *lenp,
  67                                 loff_t *ppos);
  68
  69 static struct ctl_table sctp_table[] = {
  70         {
  71                 .procname       = "sctp_mem",
  72                 .data           = &sysctl_sctp_mem,
  73                 .maxlen         = sizeof(sysctl_sctp_mem),
  74                 .mode           = 0644,
  75                 .proc_handler   = proc_doulongvec_minmax
  76         },
  77         {
  78                 .procname       = "sctp_rmem",
  79                 .data           = &sysctl_sctp_rmem,
  80                 .maxlen         = sizeof(sysctl_sctp_rmem),
  81                 .mode           = 0644,
  82                 .proc_handler   = proc_dointvec,
  83         },
  84         {
  85                 .procname       = "sctp_wmem",
  86                 .data           = &sysctl_sctp_wmem,
  87                 .maxlen         = sizeof(sysctl_sctp_wmem),
  88                 .mode           = 0644,
  89                 .proc_handler   = proc_dointvec,
  90         },
  91
  92         { /* sentinel */ }
  93 };
  94
  95 static struct ctl_table sctp_net_table[] = {
  96         {
  97                 .procname       = "rto_initial",
  98                 .data           = &init_net.sctp.rto_initial,
  99                 .maxlen         = sizeof(unsigned int),
 100                 .mode           = 0644,
 101                 .proc_handler   = proc_dointvec_minmax,
 102                 .extra1         = &one,
 103                 .extra2         = &timer_max
 104         },
 105         {
 106                 .procname       = "rto_min",
 107                 .data           = &init_net.sctp.rto_min,
 108                 .maxlen         = sizeof(unsigned int),
 109                 .mode           = 0644,
 110                 .proc_handler   = proc_sctp_do_rto_min,
 111                 .extra1         = &one,
 112                 .extra2         = &init_net.sctp.rto_max
 113         },
 114         {
 115                 .procname       = "rto_max",
 116                 .data           = &init_net.sctp.rto_max,
 117                 .maxlen         = sizeof(unsigned int),
 118                 .mode           = 0644,
 119                 .proc_handler   = proc_sctp_do_rto_max,
 120                 .extra1         = &init_net.sctp.rto_min,
 121                 .extra2         = &timer_max
 122         },
 123         {
 124                 .procname       = "rto_alpha_exp_divisor",
 125                 .data           = &init_net.sctp.rto_alpha,
 126                 .maxlen         = sizeof(int),
 127                 .mode           = 0444,
 128                 .proc_handler   = proc_dointvec,
 129         },
 130         {
 131                 .procname       = "rto_beta_exp_divisor",
 132                 .data           = &init_net.sctp.rto_beta,
 133                 .maxlen         = sizeof(int),
 134                 .mode           = 0444,
 135                 .proc_handler   = proc_dointvec,
 136         },
 137         {
 138                 .procname       = "max_burst",
 139                 .data           = &init_net.sctp.max_burst,
 140                 .maxlen         = sizeof(int),
 141                 .mode           = 0644,
 142                 .proc_handler   = proc_dointvec_minmax,
 143                 .extra1         = &zero,
 144                 .extra2         = &int_max
 145         },
 146         {
 147                 .procname       = "cookie_preserve_enable",
 148                 .data           = &init_net.sctp.cookie_preserve_enable,
 149                 .maxlen         = sizeof(int),
 150                 .mode           = 0644,
 151                 .proc_handler   = proc_dointvec,
 152         },
 153         {
 154                 .procname       = "cookie_hmac_alg",
 155                 .maxlen         = 8,
 156                 .mode           = 0644,
 157                 .proc_handler   = proc_sctp_do_hmac_alg,
 158         },
 159         {
 160                 .procname       = "valid_cookie_life",
 161                 .data           = &init_net.sctp.valid_cookie_life,
 162                 .maxlen         = sizeof(unsigned int),
 163                 .mode           = 0644,
 164                 .proc_handler   = proc_dointvec_minmax,
 165                 .extra1         = &one,
 166                 .extra2         = &timer_max
 167         },
 168         {
 169                 .procname       = "sack_timeout",
 170                 .data           = &init_net.sctp.sack_timeout,
 171                 .maxlen         = sizeof(int),
 172                 .mode           = 0644,
 173                 .proc_handler   = proc_dointvec_minmax,
 174                 .extra1         = &sack_timer_min,
 175                 .extra2         = &sack_timer_max,
 176         },
 177         {
 178                 .procname       = "hb_interval",
 179                 .data           = &init_net.sctp.hb_interval,
 180                 .maxlen         = sizeof(unsigned int),
 181                 .mode           = 0644,
 182                 .proc_handler   = proc_dointvec_minmax,
 183                 .extra1         = &one,
 184                 .extra2         = &timer_max
 185         },
 186         {
 187                 .procname       = "association_max_retrans",
 188                 .data           = &init_net.sctp.max_retrans_association,
 189                 .maxlen         = sizeof(int),
 190                 .mode           = 0644,
 191                 .proc_handler   = proc_dointvec_minmax,
 192                 .extra1         = &one,
 193                 .extra2         = &int_max
 194         },
 195         {
 196                 .procname       = "path_max_retrans",
 197                 .data           = &init_net.sctp.max_retrans_path,
 198                 .maxlen         = sizeof(int),
 199                 .mode           = 0644,
 200                 .proc_handler   = proc_dointvec_minmax,
 201                 .extra1         = &one,
 202                 .extra2         = &int_max
 203         },
 204         {
 205                 .procname       = "max_init_retransmits",
 206                 .data           = &init_net.sctp.max_retrans_init,
 207                 .maxlen         = sizeof(int),
 208                 .mode           = 0644,
 209                 .proc_handler   = proc_dointvec_minmax,
 210                 .extra1         = &one,
 211                 .extra2         = &int_max
 212         },
 213         {
 214                 .procname       = "pf_retrans",
 215                 .data           = &init_net.sctp.pf_retrans,
 216                 .maxlen         = sizeof(int),
 217                 .mode           = 0644,
 218                 .proc_handler   = proc_dointvec_minmax,
 219                 .extra1         = &zero,
 220                 .extra2         = &int_max
 221         },
 222         {
 223                 .procname       = "sndbuf_policy",
 224                 .data           = &init_net.sctp.sndbuf_policy,
 225                 .maxlen         = sizeof(int),
 226                 .mode           = 0644,
 227                 .proc_handler   = proc_dointvec,
 228         },
 229         {
 230                 .procname       = "rcvbuf_policy",
 231                 .data           = &init_net.sctp.rcvbuf_policy,
 232                 .maxlen         = sizeof(int),
 233                 .mode           = 0644,
 234                 .proc_handler   = proc_dointvec,
 235         },
 236         {
 237                 .procname       = "default_auto_asconf",
 238                 .data           = &init_net.sctp.default_auto_asconf,
 239                 .maxlen         = sizeof(int),
 240                 .mode           = 0644,
 241                 .proc_handler   = proc_dointvec,
 242         },
 243         {
 244                 .procname       = "addip_enable",
 245                 .data           = &init_net.sctp.addip_enable,
 246                 .maxlen         = sizeof(int),
 247                 .mode           = 0644,
 248                 .proc_handler   = proc_dointvec,
 249         },
 250         {
 251                 .procname       = "addip_noauth_enable",
 252                 .data           = &init_net.sctp.addip_noauth,
 253                 .maxlen         = sizeof(int),
 254                 .mode           = 0644,
 255                 .proc_handler   = proc_dointvec,
 256         },
 257         {
 258                 .procname       = "prsctp_enable",
 259                 .data           = &init_net.sctp.prsctp_enable,
 260                 .maxlen         = sizeof(int),
 261                 .mode           = 0644,
 262                 .proc_handler   = proc_dointvec,
 263         },
 264         {
 265                 .procname       = "auth_enable",
 266                 .data           = &init_net.sctp.auth_enable,
 267                 .maxlen         = sizeof(int),
 268                 .mode           = 0644,
 269                 .proc_handler   = proc_dointvec,
 270         },
 271         {
 272                 .procname       = "addr_scope_policy",
 273                 .data           = &init_net.sctp.scope_policy,
 274                 .maxlen         = sizeof(int),
 275                 .mode           = 0644,
 276                 .proc_handler   = proc_dointvec_minmax,
 277                 .extra1         = &zero,
 278                 .extra2         = &addr_scope_max,
 279         },
 280         {
 281                 .procname       = "rwnd_update_shift",
 282                 .data           = &init_net.sctp.rwnd_upd_shift,
 283                 .maxlen         = sizeof(int),
 284                 .mode           = 0644,
 285                 .proc_handler   = &proc_dointvec_minmax,
 286                 .extra1         = &one,
 287                 .extra2         = &rwnd_scale_max,
 288         },
 289         {
 290                 .procname       = "max_autoclose",
 291                 .data           = &init_net.sctp.max_autoclose,
 292                 .maxlen         = sizeof(unsigned long),
 293                 .mode           = 0644,
 294                 .proc_handler   = &proc_doulongvec_minmax,
 295                 .extra1         = &max_autoclose_min,
 296                 .extra2         = &max_autoclose_max,
 297         },
 298
 299         { /* sentinel */ }
 300 };
 301
 302 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl, int write,
 303                                 void __user *buffer, size_t *lenp,
 304                                 loff_t *ppos)
 305 {
 306         struct net *net = current->nsproxy->net_ns;
 307         char tmp[8];
 308         struct ctl_table tbl;
 309         int ret;
 310         int changed = 0;
 311         char *none = "none";
 312
 313         memset(&tbl, 0, sizeof(struct ctl_table));
 314
 315         if (write) {
 316                 tbl.data = tmp;
 317                 tbl.maxlen = 8;
 318         } else {
 319                 tbl.data = net->sctp.sctp_hmac_alg ? : none;
 320                 tbl.maxlen = strlen(tbl.data);
 321         }
 322                 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 323
 324         if (write) {
 325 #ifdef CONFIG_CRYPTO_MD5
 326                 if (!strncmp(tmp, "md5", 3)) {
 327                         net->sctp.sctp_hmac_alg = "md5";
 328                         changed = 1;
 329                 }
 330 #endif
 331 #ifdef CONFIG_CRYPTO_SHA1
 332                 if (!strncmp(tmp, "sha1", 4)) {
 333                         net->sctp.sctp_hmac_alg = "sha1";
 334                         changed = 1;
 335                 }
 336 #endif
 337                 if (!strncmp(tmp, "none", 4)) {
 338                         net->sctp.sctp_hmac_alg = NULL;
 339                         changed = 1;
 340                 }
 341
 342                 if (!changed)
 343                         ret = -EINVAL;
 344         }
 345
 346         return ret;
 347 }
 348
 349 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
 350                                 void __user *buffer, size_t *lenp,
 351                                 loff_t *ppos)
 352 {
 353         struct net *net = current->nsproxy->net_ns;
 354         int new_value;
 355         struct ctl_table tbl;
 356         unsigned int min = *(unsigned int *) ctl->extra1;
 357         unsigned int max = *(unsigned int *) ctl->extra2;
 358         int ret;
 359
 360         memset(&tbl, 0, sizeof(struct ctl_table));
 361         tbl.maxlen = sizeof(unsigned int);
 362
 363         if (write)
 364                 tbl.data = &new_value;
 365         else
 366                 tbl.data = &net->sctp.rto_min;
 367         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 368         if (write) {
 369                 if (ret || new_value > max || new_value < min)
 370                         return -EINVAL;
 371                 net->sctp.rto_min = new_value;
 372         }
 373         return ret;
 374 }
 375
 376 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
 377                                 void __user *buffer, size_t *lenp,
 378                                 loff_t *ppos)
 379 {
 380         struct net *net = current->nsproxy->net_ns;
 381         int new_value;
 382         struct ctl_table tbl;
 383         unsigned int min = *(unsigned int *) ctl->extra1;
 384         unsigned int max = *(unsigned int *) ctl->extra2;
 385         int ret;
 386
 387         memset(&tbl, 0, sizeof(struct ctl_table));
 388         tbl.maxlen = sizeof(unsigned int);
 389
 390         if (write)
 391                 tbl.data = &new_value;
 392         else
 393                 tbl.data = &net->sctp.rto_max;
 394         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 395         if (write) {
 396                 if (ret || new_value > max || new_value < min)
 397                         return -EINVAL;
 398                 net->sctp.rto_max = new_value;
 399         }
 400         return ret;
 401 }
 402
 403 int sctp_sysctl_net_register(struct net *net)
 404 {
 405         struct ctl_table *table;
 406         int i;
 407
 408         table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
 409         if (!table)
 410                 return -ENOMEM;
 411
 412         for (i = 0; table[i].data; i++)
 413                 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
 414
 415         net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
 416         return 0;
 417 }
 418
 419 void sctp_sysctl_net_unregister(struct net *net)
 420 {
 421         struct ctl_table *table;
 422
 423         table = net->sctp.sysctl_header->ctl_table_arg;
 424         unregister_net_sysctl_table(net->sctp.sysctl_header);
 425         kfree(table);
 426 }
 427
 428 static struct ctl_table_header * sctp_sysctl_header;
 429
 430 /* Sysctl registration.  */
 431 void sctp_sysctl_register(void)
 432 {
 433         sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
 434 }
 435
 436 /* Sysctl deregistration.  */
 437 void sctp_sysctl_unregister(void)
 438 {
 439         unregister_net_sysctl_table(sctp_sysctl_header);
 440 }