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