Pileus Git - ~andy/linux/blob - 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 int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
  65                                 void __user *buffer, size_t *lenp,
  66                                 loff_t *ppos);
  67 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
  68                                 void __user *buffer, size_t *lenp,
  69                                 loff_t *ppos);
  70
  71 static struct ctl_table sctp_table[] = {
  72         {
  73                 .procname       = "sctp_mem",
  74                 .data           = &sysctl_sctp_mem,
  75                 .maxlen         = sizeof(sysctl_sctp_mem),
  76                 .mode           = 0644,
  77                 .proc_handler   = proc_doulongvec_minmax
  78         },
  79         {
  80                 .procname       = "sctp_rmem",
  81                 .data           = &sysctl_sctp_rmem,
  82                 .maxlen         = sizeof(sysctl_sctp_rmem),
  83                 .mode           = 0644,
  84                 .proc_handler   = proc_dointvec,
  85         },
  86         {
  87                 .procname       = "sctp_wmem",
  88                 .data           = &sysctl_sctp_wmem,
  89                 .maxlen         = sizeof(sysctl_sctp_wmem),
  90                 .mode           = 0644,
  91                 .proc_handler   = proc_dointvec,
  92         },
  93
  94         { /* sentinel */ }
  95 };
  96
  97 static struct ctl_table sctp_net_table[] = {
  98         {
  99                 .procname       = "rto_initial",
 100                 .data           = &init_net.sctp.rto_initial,
 101                 .maxlen         = sizeof(unsigned int),
 102                 .mode           = 0644,
 103                 .proc_handler   = proc_dointvec_minmax,
 104                 .extra1         = &one,
 105                 .extra2         = &timer_max
 106         },
 107         {
 108                 .procname       = "rto_min",
 109                 .data           = &init_net.sctp.rto_min,
 110                 .maxlen         = sizeof(unsigned int),
 111                 .mode           = 0644,
 112                 .proc_handler   = proc_sctp_do_rto_min,
 113                 .extra1         = &one,
 114                 .extra2         = &init_net.sctp.rto_max
 115         },
 116         {
 117                 .procname       = "rto_max",
 118                 .data           = &init_net.sctp.rto_max,
 119                 .maxlen         = sizeof(unsigned int),
 120                 .mode           = 0644,
 121                 .proc_handler   = proc_sctp_do_rto_max,
 122                 .extra1         = &init_net.sctp.rto_min,
 123                 .extra2         = &timer_max
 124         },
 125         {
 126                 .procname       = "rto_alpha_exp_divisor",
 127                 .data           = &init_net.sctp.rto_alpha,
 128                 .maxlen         = sizeof(int),
 129                 .mode           = 0444,
 130                 .proc_handler   = proc_dointvec,
 131         },
 132         {
 133                 .procname       = "rto_beta_exp_divisor",
 134                 .data           = &init_net.sctp.rto_beta,
 135                 .maxlen         = sizeof(int),
 136                 .mode           = 0444,
 137                 .proc_handler   = proc_dointvec,
 138         },
 139         {
 140                 .procname       = "max_burst",
 141                 .data           = &init_net.sctp.max_burst,
 142                 .maxlen         = sizeof(int),
 143                 .mode           = 0644,
 144                 .proc_handler   = proc_dointvec_minmax,
 145                 .extra1         = &zero,
 146                 .extra2         = &int_max
 147         },
 148         {
 149                 .procname       = "cookie_preserve_enable",
 150                 .data           = &init_net.sctp.cookie_preserve_enable,
 151                 .maxlen         = sizeof(int),
 152                 .mode           = 0644,
 153                 .proc_handler   = proc_dointvec,
 154         },
 155         {
 156                 .procname       = "cookie_hmac_alg",
 157                 .maxlen         = 8,
 158                 .mode           = 0644,
 159                 .proc_handler   = proc_sctp_do_hmac_alg,
 160         },
 161         {
 162                 .procname       = "valid_cookie_life",
 163                 .data           = &init_net.sctp.valid_cookie_life,
 164                 .maxlen         = sizeof(unsigned int),
 165                 .mode           = 0644,
 166                 .proc_handler   = proc_dointvec_minmax,
 167                 .extra1         = &one,
 168                 .extra2         = &timer_max
 169         },
 170         {
 171                 .procname       = "sack_timeout",
 172                 .data           = &init_net.sctp.sack_timeout,
 173                 .maxlen         = sizeof(int),
 174                 .mode           = 0644,
 175                 .proc_handler   = proc_dointvec_minmax,
 176                 .extra1         = &sack_timer_min,
 177                 .extra2         = &sack_timer_max,
 178         },
 179         {
 180                 .procname       = "hb_interval",
 181                 .data           = &init_net.sctp.hb_interval,
 182                 .maxlen         = sizeof(unsigned int),
 183                 .mode           = 0644,
 184                 .proc_handler   = proc_dointvec_minmax,
 185                 .extra1         = &one,
 186                 .extra2         = &timer_max
 187         },
 188         {
 189                 .procname       = "association_max_retrans",
 190                 .data           = &init_net.sctp.max_retrans_association,
 191                 .maxlen         = sizeof(int),
 192                 .mode           = 0644,
 193                 .proc_handler   = proc_dointvec_minmax,
 194                 .extra1         = &one,
 195                 .extra2         = &int_max
 196         },
 197         {
 198                 .procname       = "path_max_retrans",
 199                 .data           = &init_net.sctp.max_retrans_path,
 200                 .maxlen         = sizeof(int),
 201                 .mode           = 0644,
 202                 .proc_handler   = proc_dointvec_minmax,
 203                 .extra1         = &one,
 204                 .extra2         = &int_max
 205         },
 206         {
 207                 .procname       = "max_init_retransmits",
 208                 .data           = &init_net.sctp.max_retrans_init,
 209                 .maxlen         = sizeof(int),
 210                 .mode           = 0644,
 211                 .proc_handler   = proc_dointvec_minmax,
 212                 .extra1         = &one,
 213                 .extra2         = &int_max
 214         },
 215         {
 216                 .procname       = "pf_retrans",
 217                 .data           = &init_net.sctp.pf_retrans,
 218                 .maxlen         = sizeof(int),
 219                 .mode           = 0644,
 220                 .proc_handler   = proc_dointvec_minmax,
 221                 .extra1         = &zero,
 222                 .extra2         = &int_max
 223         },
 224         {
 225                 .procname       = "sndbuf_policy",
 226                 .data           = &init_net.sctp.sndbuf_policy,
 227                 .maxlen         = sizeof(int),
 228                 .mode           = 0644,
 229                 .proc_handler   = proc_dointvec,
 230         },
 231         {
 232                 .procname       = "rcvbuf_policy",
 233                 .data           = &init_net.sctp.rcvbuf_policy,
 234                 .maxlen         = sizeof(int),
 235                 .mode           = 0644,
 236                 .proc_handler   = proc_dointvec,
 237         },
 238         {
 239                 .procname       = "default_auto_asconf",
 240                 .data           = &init_net.sctp.default_auto_asconf,
 241                 .maxlen         = sizeof(int),
 242                 .mode           = 0644,
 243                 .proc_handler   = proc_dointvec,
 244         },
 245         {
 246                 .procname       = "addip_enable",
 247                 .data           = &init_net.sctp.addip_enable,
 248                 .maxlen         = sizeof(int),
 249                 .mode           = 0644,
 250                 .proc_handler   = proc_dointvec,
 251         },
 252         {
 253                 .procname       = "addip_noauth_enable",
 254                 .data           = &init_net.sctp.addip_noauth,
 255                 .maxlen         = sizeof(int),
 256                 .mode           = 0644,
 257                 .proc_handler   = proc_dointvec,
 258         },
 259         {
 260                 .procname       = "prsctp_enable",
 261                 .data           = &init_net.sctp.prsctp_enable,
 262                 .maxlen         = sizeof(int),
 263                 .mode           = 0644,
 264                 .proc_handler   = proc_dointvec,
 265         },
 266         {
 267                 .procname       = "auth_enable",
 268                 .data           = &init_net.sctp.auth_enable,
 269                 .maxlen         = sizeof(int),
 270                 .mode           = 0644,
 271                 .proc_handler   = proc_dointvec,
 272         },
 273         {
 274                 .procname       = "addr_scope_policy",
 275                 .data           = &init_net.sctp.scope_policy,
 276                 .maxlen         = sizeof(int),
 277                 .mode           = 0644,
 278                 .proc_handler   = proc_dointvec_minmax,
 279                 .extra1         = &zero,
 280                 .extra2         = &addr_scope_max,
 281         },
 282         {
 283                 .procname       = "rwnd_update_shift",
 284                 .data           = &init_net.sctp.rwnd_upd_shift,
 285                 .maxlen         = sizeof(int),
 286                 .mode           = 0644,
 287                 .proc_handler   = &proc_dointvec_minmax,
 288                 .extra1         = &one,
 289                 .extra2         = &rwnd_scale_max,
 290         },
 291         {
 292                 .procname       = "max_autoclose",
 293                 .data           = &init_net.sctp.max_autoclose,
 294                 .maxlen         = sizeof(unsigned long),
 295                 .mode           = 0644,
 296                 .proc_handler   = &proc_doulongvec_minmax,
 297                 .extra1         = &max_autoclose_min,
 298                 .extra2         = &max_autoclose_max,
 299         },
 300
 301         { /* sentinel */ }
 302 };
 303
 304 static int proc_sctp_do_hmac_alg(struct ctl_table *ctl,
 305                                 int write,
 306                                 void __user *buffer, size_t *lenp,
 307                                 loff_t *ppos)
 308 {
 309         struct net *net = current->nsproxy->net_ns;
 310         char tmp[8];
 311         struct ctl_table tbl;
 312         int ret;
 313         int changed = 0;
 314         char *none = "none";
 315
 316         memset(&tbl, 0, sizeof(struct ctl_table));
 317
 318         if (write) {
 319                 tbl.data = tmp;
 320                 tbl.maxlen = 8;
 321         } else {
 322                 tbl.data = net->sctp.sctp_hmac_alg ? : none;
 323                 tbl.maxlen = strlen(tbl.data);
 324         }
 325                 ret = proc_dostring(&tbl, write, buffer, lenp, ppos);
 326
 327         if (write) {
 328 #ifdef CONFIG_CRYPTO_MD5
 329                 if (!strncmp(tmp, "md5", 3)) {
 330                         net->sctp.sctp_hmac_alg = "md5";
 331                         changed = 1;
 332                 }
 333 #endif
 334 #ifdef CONFIG_CRYPTO_SHA1
 335                 if (!strncmp(tmp, "sha1", 4)) {
 336                         net->sctp.sctp_hmac_alg = "sha1";
 337                         changed = 1;
 338                 }
 339 #endif
 340                 if (!strncmp(tmp, "none", 4)) {
 341                         net->sctp.sctp_hmac_alg = NULL;
 342                         changed = 1;
 343                 }
 344
 345                 if (!changed)
 346                         ret = -EINVAL;
 347         }
 348
 349         return ret;
 350 }
 351
 352 static int proc_sctp_do_rto_min(struct ctl_table *ctl, int write,
 353                                 void __user *buffer, size_t *lenp,
 354                                 loff_t *ppos)
 355 {
 356         struct net *net = current->nsproxy->net_ns;
 357         int new_value;
 358         struct ctl_table tbl;
 359         unsigned int min = *(unsigned int *) ctl->extra1;
 360         unsigned int max = *(unsigned int *) ctl->extra2;
 361         int ret;
 362
 363         memset(&tbl, 0, sizeof(struct ctl_table));
 364         tbl.maxlen = sizeof(unsigned int);
 365
 366         if (write)
 367                 tbl.data = &new_value;
 368         else
 369                 tbl.data = &net->sctp.rto_min;
 370         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 371         if (write) {
 372                 if (ret || new_value > max || new_value < min)
 373                         return -EINVAL;
 374                 net->sctp.rto_min = new_value;
 375         }
 376         return ret;
 377 }
 378
 379 static int proc_sctp_do_rto_max(struct ctl_table *ctl, int write,
 380                                 void __user *buffer, size_t *lenp,
 381                                 loff_t *ppos)
 382 {
 383         struct net *net = current->nsproxy->net_ns;
 384         int new_value;
 385         struct ctl_table tbl;
 386         unsigned int min = *(unsigned int *) ctl->extra1;
 387         unsigned int max = *(unsigned int *) ctl->extra2;
 388         int ret;
 389
 390         memset(&tbl, 0, sizeof(struct ctl_table));
 391         tbl.maxlen = sizeof(unsigned int);
 392
 393         if (write)
 394                 tbl.data = &new_value;
 395         else
 396                 tbl.data = &net->sctp.rto_max;
 397         ret = proc_dointvec(&tbl, write, buffer, lenp, ppos);
 398         if (write) {
 399                 if (ret || new_value > max || new_value < min)
 400                         return -EINVAL;
 401                 net->sctp.rto_max = new_value;
 402         }
 403         return ret;
 404 }
 405
 406 int sctp_sysctl_net_register(struct net *net)
 407 {
 408         struct ctl_table *table;
 409         int i;
 410
 411         table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
 412         if (!table)
 413                 return -ENOMEM;
 414
 415         for (i = 0; table[i].data; i++)
 416                 table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
 417
 418         net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
 419         return 0;
 420 }
 421
 422 void sctp_sysctl_net_unregister(struct net *net)
 423 {
 424         struct ctl_table *table;
 425
 426         table = net->sctp.sysctl_header->ctl_table_arg;
 427         unregister_net_sysctl_table(net->sctp.sysctl_header);
 428         kfree(table);
 429 }
 430
 431 static struct ctl_table_header * sctp_sysctl_header;
 432
 433 /* Sysctl registration.  */
 434 void sctp_sysctl_register(void)
 435 {
 436         sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
 437 }
 438
 439 /* Sysctl deregistration.  */
 440 void sctp_sysctl_unregister(void)
 441 {
 442         unregister_net_sysctl_table(sctp_sysctl_header);
 443 }