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