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 #include <net/sctp/structs.h>
  38 #include <net/sctp/sctp.h>
  39 #include <linux/sysctl.h>
  40
  41 static int zero = 0;
  42 static int one = 1;
  43 static int timer_max = 86400000; /* ms in one day */
  44 static int int_max = INT_MAX;
  45 static int sack_timer_min = 1;
  46 static int sack_timer_max = 500;
  47 static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
  48 static int rwnd_scale_max = 16;
  49 static unsigned long max_autoclose_min = 0;
  50 static unsigned long max_autoclose_max =
  51         (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
  52         ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
  53
  54 extern long sysctl_sctp_mem[3];
  55 extern int sysctl_sctp_rmem[3];
  56 extern int sysctl_sctp_wmem[3];
  57
  58 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl,
  59                                 int write,
  60                                 void __user *buffer, size_t *lenp,
  61
  62                                 loff_t *ppos);
  63 static struct ctl_table sctp_table[] = {
  64         {
  65                 .procname       = "sctp_mem",
  66                 .data           = &sysctl_sctp_mem,
  67                 .maxlen         = sizeof(sysctl_sctp_mem),
  68                 .mode           = 0644,
  69                 .proc_handler   = proc_doulongvec_minmax
  70         },
  71         {
  72                 .procname       = "sctp_rmem",
  73                 .data           = &sysctl_sctp_rmem,
  74                 .maxlen         = sizeof(sysctl_sctp_rmem),
  75                 .mode           = 0644,
  76                 .proc_handler   = proc_dointvec,
  77         },
  78         {
  79                 .procname       = "sctp_wmem",
  80                 .data           = &sysctl_sctp_wmem,
  81                 .maxlen         = sizeof(sysctl_sctp_wmem),
  82                 .mode           = 0644,
  83                 .proc_handler   = proc_dointvec,
  84         },
  85
  86         { /* sentinel */ }
  87 };
  88
  89 static struct ctl_table sctp_net_table[] = {
  90         {
  91                 .procname       = "rto_initial",
  92                 .data           = &init_net.sctp.rto_initial,
  93                 .maxlen         = sizeof(unsigned int),
  94                 .mode           = 0644,
  95                 .proc_handler   = proc_dointvec_minmax,
  96                 .extra1         = &one,
  97                 .extra2         = &timer_max
  98         },
  99         {
 100                 .procname       = "rto_min",
 101                 .data           = &init_net.sctp.rto_min,
 102                 .maxlen         = sizeof(unsigned int),
 103                 .mode           = 0644,
 104                 .proc_handler   = proc_dointvec_minmax,
 105                 .extra1         = &one,
 106                 .extra2         = &timer_max
 107         },
 108         {
 109                 .procname       = "rto_max",
 110                 .data           = &init_net.sctp.rto_max,
 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_alpha_exp_divisor",
 119                 .data           = &init_net.sctp.rto_alpha,
 120                 .maxlen         = sizeof(int),
 121                 .mode           = 0444,
 122                 .proc_handler   = proc_dointvec,
 123         },
 124         {
 125                 .procname       = "rto_beta_exp_divisor",
 126                 .data           = &init_net.sctp.rto_beta,
 127                 .maxlen         = sizeof(int),
 128                 .mode           = 0444,
 129                 .proc_handler   = proc_dointvec,
 130         },
 131         {
 132                 .procname       = "max_burst",
 133                 .data           = &init_net.sctp.max_burst,
 134                 .maxlen         = sizeof(int),
 135                 .mode           = 0644,
 136                 .proc_handler   = proc_dointvec_minmax,
 137                 .extra1         = &zero,
 138                 .extra2         = &int_max
 139         },
 140         {
 141                 .procname       = "cookie_preserve_enable",
 142                 .data           = &init_net.sctp.cookie_preserve_enable,
 143                 .maxlen         = sizeof(int),
 144                 .mode           = 0644,
 145                 .proc_handler   = proc_dointvec,
 146         },
 147         {
 148                 .procname       = "cookie_hmac_alg",
 149                 .maxlen         = 8,
 150                 .mode           = 0644,
 151                 .proc_handler   = proc_sctp_do_hmac_alg,
 152         },
 153         {
 154                 .procname       = "valid_cookie_life",
 155                 .data           = &init_net.sctp.valid_cookie_life,
 156                 .maxlen         = sizeof(unsigned int),
 157                 .mode           = 0644,
 158                 .proc_handler   = proc_dointvec_minmax,
 159                 .extra1         = &one,
 160                 .extra2         = &timer_max
 161         },
 162         {
 163                 .procname       = "sack_timeout",
 164                 .data           = &init_net.sctp.sack_timeout,
 165                 .maxlen         = sizeof(int),
 166                 .mode           = 0644,
 167                 .proc_handler   = proc_dointvec_minmax,
 168                 .extra1         = &sack_timer_min,
 169                 .extra2         = &sack_timer_max,
 170         },
 171         {
 172                 .procname       = "hb_interval",
 173                 .data           = &init_net.sctp.hb_interval,
 174                 .maxlen         = sizeof(unsigned int),
 175                 .mode           = 0644,
 176                 .proc_handler   = proc_dointvec_minmax,
 177                 .extra1         = &one,
 178                 .extra2         = &timer_max
 179         },
 180         {
 181                 .procname       = "association_max_retrans",
 182                 .data           = &init_net.sctp.max_retrans_association,
 183                 .maxlen         = sizeof(int),
 184                 .mode           = 0644,
 185                 .proc_handler   = proc_dointvec_minmax,
 186                 .extra1         = &one,
 187                 .extra2         = &int_max
 188         },
 189         {
 190                 .procname       = "path_max_retrans",
 191                 .data           = &init_net.sctp.max_retrans_path,
 192                 .maxlen         = sizeof(int),
 193                 .mode           = 0644,
 194                 .proc_handler   = proc_dointvec_minmax,
 195                 .extra1         = &one,
 196                 .extra2         = &int_max
 197         },
 198         {
 199                 .procname       = "max_init_retransmits",
 200                 .data           = &init_net.sctp.max_retrans_init,
 201                 .maxlen         = sizeof(int),
 202                 .mode           = 0644,
 203                 .proc_handler   = proc_dointvec_minmax,
 204                 .extra1         = &one,
 205                 .extra2         = &int_max
 206         },
 207         {
 208                 .procname       = "pf_retrans",
 209                 .data           = &init_net.sctp.pf_retrans,
 210                 .maxlen         = sizeof(int),
 211                 .mode           = 0644,
 212                 .proc_handler   = proc_dointvec_minmax,
 213                 .extra1         = &zero,
 214                 .extra2         = &int_max
 215         },
 216         {
 217                 .procname       = "sndbuf_policy",
 218                 .data           = &init_net.sctp.sndbuf_policy,
 219                 .maxlen         = sizeof(int),
 220                 .mode           = 0644,
 221                 .proc_handler   = proc_dointvec,
 222         },
 223         {
 224                 .procname       = "rcvbuf_policy",
 225                 .data           = &init_net.sctp.rcvbuf_policy,
 226                 .maxlen         = sizeof(int),
 227                 .mode           = 0644,
 228                 .proc_handler   = proc_dointvec,
 229         },
 230         {
 231                 .procname       = "default_auto_asconf",
 232                 .data           = &init_net.sctp.default_auto_asconf,
 233                 .maxlen         = sizeof(int),
 234                 .mode           = 0644,
 235                 .proc_handler   = proc_dointvec,
 236         },
 237         {
 238                 .procname       = "addip_enable",
 239                 .data           = &init_net.sctp.addip_enable,
 240                 .maxlen         = sizeof(int),
 241                 .mode           = 0644,
 242                 .proc_handler   = proc_dointvec,
 243         },
 244         {
 245                 .procname       = "addip_noauth_enable",
 246                 .data           = &init_net.sctp.addip_noauth,
 247                 .maxlen         = sizeof(int),
 248                 .mode           = 0644,
 249                 .proc_handler   = proc_dointvec,
 250         },
 251         {
 252                 .procname       = "prsctp_enable",
 253                 .data           = &init_net.sctp.prsctp_enable,
 254                 .maxlen         = sizeof(int),
 255                 .mode           = 0644,
 256                 .proc_handler   = proc_dointvec,
 257         },
 258         {
 259                 .procname       = "auth_enable",
 260                 .data           = &init_net.sctp.auth_enable,
 261                 .maxlen         = sizeof(int),
 262                 .mode           = 0644,
 263                 .proc_handler   = proc_dointvec,
 264         },
 265         {
 266                 .procname       = "addr_scope_policy",
 267                 .data           = &init_net.sctp.scope_policy,
 268                 .maxlen         = sizeof(int),
 269                 .mode           = 0644,
 270                 .proc_handler   = proc_dointvec_minmax,
 271                 .extra1         = &zero,
 272                 .extra2         = &addr_scope_max,
 273         },
 274         {
 275                 .procname       = "rwnd_update_shift",
 276                 .data           = &init_net.sctp.rwnd_upd_shift,
 277                 .maxlen         = sizeof(int),
 278                 .mode           = 0644,
 279                 .proc_handler   = &proc_dointvec_minmax,
 280                 .extra1         = &one,
 281                 .extra2         = &rwnd_scale_max,
 282         },
 283         {
 284                 .procname       = "max_autoclose",
 285                 .data           = &init_net.sctp.max_autoclose,
 286                 .maxlen         = sizeof(unsigned long),
 287                 .mode           = 0644,
 288                 .proc_handler   = &proc_doulongvec_minmax,
 289                 .extra1         = &max_autoclose_min,
 290                 .extra2         = &max_autoclose_max,
 291         },
 292
 293         { /* sentinel */ }
 294 };
 295
 296 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl,
 297                                 int write,
 298                                 void __user *buffer, size_t *lenp,
 299                                 loff_t *ppos)
 300 {
 301         struct net *net = current->nsproxy->net_ns;
 302         char tmp[8];
 303         struct ctl_table tbl;
 304         int ret;
 305         int changed = 0;
 306         char *none = "none";
 307
 308         memset(&tbl, 0, sizeof(struct ctl_table));
 309
 310         if (write) {
 311                 tbl.data = tmp;
 312                 tbl.maxlen = 8;
 313         } else {
 314                 tbl.data = net->sctp.sctp_hmac_alg ? : none;
 315                 tbl.maxlen = strlen(tbl.data);
 316         }
 317                 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 318
 319         if (write) {
 320 #ifdef CONFIG_CRYPTO_MD5
 321                 if (!strncmp(tmp, "md5", 3)) {
 322                         net->sctp.sctp_hmac_alg = "md5";
 323                         changed = 1;
 324                 }
 325 #endif
 326 #ifdef CONFIG_CRYPTO_SHA1
 327                 if (!strncmp(tmp, "sha1", 4)) {
 328                         net->sctp.sctp_hmac_alg = "sha1";
 329                         changed = 1;
 330                 }
 331 #endif
 332                 if (!strncmp(tmp, "none", 4)) {
 333                         net->sctp.sctp_hmac_alg = NULL;
 334                         changed = 1;
 335                 }
 336
 337                 if (!changed)
 338                         ret = -EINVAL;
 339         }
 340
 341         return ret;
 342 }
 343
 344 int sctp_sysctl_net_register(struct net *net)
 345 {
 346         struct ctl_table *table;
 347         int i;
 348
 349         table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
 350         if (!table)
 351                 return -ENOMEM;
 352
 353         for (i = 0; table[i].data; i++)
 354                 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
 355
 356         net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
 357         return 0;
 358 }
 359
 360 void sctp_sysctl_net_unregister(struct net *net)
 361 {
 362         struct ctl_table *table;
 363
 364         table = net->sctp.sysctl_header->ctl_table_arg;
 365         unregister_net_sysctl_table(net->sctp.sysctl_header);
 366         kfree(table);
 367 }
 368
 369 static struct ctl_table_header * sctp_sysctl_header;
 370
 371 /* Sysctl registration.  */
 372 void sctp_sysctl_register(void)
 373 {
 374         sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
 375 }
 376
 377 /* Sysctl deregistration.  */
 378 void sctp_sysctl_unregister(void)
 379 {
 380         unregister_net_sysctl_table(sctp_sysctl_header);
 381 }