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,
  60                                 int write,
  61                                 void __user *buffer, size_t *lenp,
  62
  63                                 loff_t *ppos);
  64 static struct ctl_table sctp_table[] = {
  65         {
  66                 .procname       = "sctp_mem",
  67                 .data           = &sysctl_sctp_mem,
  68                 .maxlen         = sizeof(sysctl_sctp_mem),
  69                 .mode           = 0644,
  70                 .proc_handler   = proc_doulongvec_minmax
  71         },
  72         {
  73                 .procname       = "sctp_rmem",
  74                 .data           = &sysctl_sctp_rmem,
  75                 .maxlen         = sizeof(sysctl_sctp_rmem),
  76                 .mode           = 0644,
  77                 .proc_handler   = proc_dointvec,
  78         },
  79         {
  80                 .procname       = "sctp_wmem",
  81                 .data           = &sysctl_sctp_wmem,
  82                 .maxlen         = sizeof(sysctl_sctp_wmem),
  83                 .mode           = 0644,
  84                 .proc_handler   = proc_dointvec,
  85         },
  86
  87         { /* sentinel */ }
  88 };
  89
  90 static struct ctl_table sctp_net_table[] = {
  91         {
  92                 .procname       = "rto_initial",
  93                 .data           = &init_net.sctp.rto_initial,
  94                 .maxlen         = sizeof(unsigned int),
  95                 .mode           = 0644,
  96                 .proc_handler   = proc_dointvec_minmax,
  97                 .extra1         = &one,
  98                 .extra2         = &timer_max
  99         },
 100         {
 101                 .procname       = "rto_min",
 102                 .data           = &init_net.sctp.rto_min,
 103                 .maxlen         = sizeof(unsigned int),
 104                 .mode           = 0644,
 105                 .proc_handler   = proc_dointvec_minmax,
 106                 .extra1         = &one,
 107                 .extra2         = &timer_max
 108         },
 109         {
 110                 .procname       = "rto_max",
 111                 .data           = &init_net.sctp.rto_max,
 112                 .maxlen         = sizeof(unsigned int),
 113                 .mode           = 0644,
 114                 .proc_handler   = proc_dointvec_minmax,
 115                 .extra1         = &one,
 116                 .extra2         = &timer_max
 117         },
 118         {
 119                 .procname       = "rto_alpha_exp_divisor",
 120                 .data           = &init_net.sctp.rto_alpha,
 121                 .maxlen         = sizeof(int),
 122                 .mode           = 0444,
 123                 .proc_handler   = proc_dointvec,
 124         },
 125         {
 126                 .procname       = "rto_beta_exp_divisor",
 127                 .data           = &init_net.sctp.rto_beta,
 128                 .maxlen         = sizeof(int),
 129                 .mode           = 0444,
 130                 .proc_handler   = proc_dointvec,
 131         },
 132         {
 133                 .procname       = "max_burst",
 134                 .data           = &init_net.sctp.max_burst,
 135                 .maxlen         = sizeof(int),
 136                 .mode           = 0644,
 137                 .proc_handler   = proc_dointvec_minmax,
 138                 .extra1         = &zero,
 139                 .extra2         = &int_max
 140         },
 141         {
 142                 .procname       = "cookie_preserve_enable",
 143                 .data           = &init_net.sctp.cookie_preserve_enable,
 144                 .maxlen         = sizeof(int),
 145                 .mode           = 0644,
 146                 .proc_handler   = proc_dointvec,
 147         },
 148         {
 149                 .procname       = "cookie_hmac_alg",
 150                 .maxlen         = 8,
 151                 .mode           = 0644,
 152                 .proc_handler   = proc_sctp_do_hmac_alg,
 153         },
 154         {
 155                 .procname       = "valid_cookie_life",
 156                 .data           = &init_net.sctp.valid_cookie_life,
 157                 .maxlen         = sizeof(unsigned int),
 158                 .mode           = 0644,
 159                 .proc_handler   = proc_dointvec_minmax,
 160                 .extra1         = &one,
 161                 .extra2         = &timer_max
 162         },
 163         {
 164                 .procname       = "sack_timeout",
 165                 .data           = &init_net.sctp.sack_timeout,
 166                 .maxlen         = sizeof(int),
 167                 .mode           = 0644,
 168                 .proc_handler   = proc_dointvec_minmax,
 169                 .extra1         = &sack_timer_min,
 170                 .extra2         = &sack_timer_max,
 171         },
 172         {
 173                 .procname       = "hb_interval",
 174                 .data           = &init_net.sctp.hb_interval,
 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       = "association_max_retrans",
 183                 .data           = &init_net.sctp.max_retrans_association,
 184                 .maxlen         = sizeof(int),
 185                 .mode           = 0644,
 186                 .proc_handler   = proc_dointvec_minmax,
 187                 .extra1         = &one,
 188                 .extra2         = &int_max
 189         },
 190         {
 191                 .procname       = "path_max_retrans",
 192                 .data           = &init_net.sctp.max_retrans_path,
 193                 .maxlen         = sizeof(int),
 194                 .mode           = 0644,
 195                 .proc_handler   = proc_dointvec_minmax,
 196                 .extra1         = &one,
 197                 .extra2         = &int_max
 198         },
 199         {
 200                 .procname       = "max_init_retransmits",
 201                 .data           = &init_net.sctp.max_retrans_init,
 202                 .maxlen         = sizeof(int),
 203                 .mode           = 0644,
 204                 .proc_handler   = proc_dointvec_minmax,
 205                 .extra1         = &one,
 206                 .extra2         = &int_max
 207         },
 208         {
 209                 .procname       = "pf_retrans",
 210                 .data           = &init_net.sctp.pf_retrans,
 211                 .maxlen         = sizeof(int),
 212                 .mode           = 0644,
 213                 .proc_handler   = proc_dointvec_minmax,
 214                 .extra1         = &zero,
 215                 .extra2         = &int_max
 216         },
 217         {
 218                 .procname       = "sndbuf_policy",
 219                 .data           = &init_net.sctp.sndbuf_policy,
 220                 .maxlen         = sizeof(int),
 221                 .mode           = 0644,
 222                 .proc_handler   = proc_dointvec,
 223         },
 224         {
 225                 .procname       = "rcvbuf_policy",
 226                 .data           = &init_net.sctp.rcvbuf_policy,
 227                 .maxlen         = sizeof(int),
 228                 .mode           = 0644,
 229                 .proc_handler   = proc_dointvec,
 230         },
 231         {
 232                 .procname       = "default_auto_asconf",
 233                 .data           = &init_net.sctp.default_auto_asconf,
 234                 .maxlen         = sizeof(int),
 235                 .mode           = 0644,
 236                 .proc_handler   = proc_dointvec,
 237         },
 238         {
 239                 .procname       = "addip_enable",
 240                 .data           = &init_net.sctp.addip_enable,
 241                 .maxlen         = sizeof(int),
 242                 .mode           = 0644,
 243                 .proc_handler   = proc_dointvec,
 244         },
 245         {
 246                 .procname       = "addip_noauth_enable",
 247                 .data           = &init_net.sctp.addip_noauth,
 248                 .maxlen         = sizeof(int),
 249                 .mode           = 0644,
 250                 .proc_handler   = proc_dointvec,
 251         },
 252         {
 253                 .procname       = "prsctp_enable",
 254                 .data           = &init_net.sctp.prsctp_enable,
 255                 .maxlen         = sizeof(int),
 256                 .mode           = 0644,
 257                 .proc_handler   = proc_dointvec,
 258         },
 259         {
 260                 .procname       = "auth_enable",
 261                 .data           = &init_net.sctp.auth_enable,
 262                 .maxlen         = sizeof(int),
 263                 .mode           = 0644,
 264                 .proc_handler   = proc_dointvec,
 265         },
 266         {
 267                 .procname       = "addr_scope_policy",
 268                 .data           = &init_net.sctp.scope_policy,
 269                 .maxlen         = sizeof(int),
 270                 .mode           = 0644,
 271                 .proc_handler   = proc_dointvec_minmax,
 272                 .extra1         = &zero,
 273                 .extra2         = &addr_scope_max,
 274         },
 275         {
 276                 .procname       = "rwnd_update_shift",
 277                 .data           = &init_net.sctp.rwnd_upd_shift,
 278                 .maxlen         = sizeof(int),
 279                 .mode           = 0644,
 280                 .proc_handler   = &proc_dointvec_minmax,
 281                 .extra1         = &one,
 282                 .extra2         = &rwnd_scale_max,
 283         },
 284         {
 285                 .procname       = "max_autoclose",
 286                 .data           = &init_net.sctp.max_autoclose,
 287                 .maxlen         = sizeof(unsigned long),
 288                 .mode           = 0644,
 289                 .proc_handler   = &proc_doulongvec_minmax,
 290                 .extra1         = &max_autoclose_min,
 291                 .extra2         = &max_autoclose_max,
 292         },
 293
 294         { /* sentinel */ }
 295 };
 296
 297 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl,
 298                                 int write,
 299                                 void __user *buffer, size_t *lenp,
 300                                 loff_t *ppos)
 301 {
 302         struct net *net = current->nsproxy->net_ns;
 303         char tmp[8];
 304         struct ctl_table tbl;
 305         int ret;
 306         int changed = 0;
 307         char *none = "none";
 308
 309         memset(&tbl, 0, sizeof(struct ctl_table));
 310
 311         if (write) {
 312                 tbl.data = tmp;
 313                 tbl.maxlen = 8;
 314         } else {
 315                 tbl.data = net->sctp.sctp_hmac_alg ? : none;
 316                 tbl.maxlen = strlen(tbl.data);
 317         }
 318                 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 319
 320         if (write) {
 321 #ifdef CONFIG_CRYPTO_MD5
 322                 if (!strncmp(tmp, "md5", 3)) {
 323                         net->sctp.sctp_hmac_alg = "md5";
 324                         changed = 1;
 325                 }
 326 #endif
 327 #ifdef CONFIG_CRYPTO_SHA1
 328                 if (!strncmp(tmp, "sha1", 4)) {
 329                         net->sctp.sctp_hmac_alg = "sha1";
 330                         changed = 1;
 331                 }
 332 #endif
 333                 if (!strncmp(tmp, "none", 4)) {
 334                         net->sctp.sctp_hmac_alg = NULL;
 335                         changed = 1;
 336                 }
 337
 338                 if (!changed)
 339                         ret = -EINVAL;
 340         }
 341
 342         return ret;
 343 }
 344
 345 int sctp_sysctl_net_register(struct net *net)
 346 {
 347         struct ctl_table *table;
 348         int i;
 349
 350         table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
 351         if (!table)
 352                 return -ENOMEM;
 353
 354         for (i = 0; table[i].data; i++)
 355                 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
 356
 357         net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
 358         return 0;
 359 }
 360
 361 void sctp_sysctl_net_unregister(struct net *net)
 362 {
 363         struct ctl_table *table;
 364
 365         table = net->sctp.sysctl_header->ctl_table_arg;
 366         unregister_net_sysctl_table(net->sctp.sysctl_header);
 367         kfree(table);
 368 }
 369
 370 static struct ctl_table_header * sctp_sysctl_header;
 371
 372 /* Sysctl registration.  */
 373 void sctp_sysctl_register(void)
 374 {
 375         sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
 376 }
 377
 378 /* Sysctl deregistration.  */
 379 void sctp_sysctl_unregister(void)
 380 {
 381         unregister_net_sysctl_table(sctp_sysctl_header);
 382 }