linux/net/sctp/sysctl.c
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   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 <lksctp-developers@lists.sourceforge.net>
  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           <liuming@us.ibm.com>
  35 *    Jon Grimm             <jgrimm@us.ibm.com>
  36 *    Ardelle Fan           <ardelle.fan@intel.com>
  37 *    Ryan Layer            <rmlayer@us.ibm.com>
  38 *    Sridhar Samudrala     <sri@us.ibm.com>
  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
  48static int zero = 0;
  49static int one = 1;
  50static int timer_max = 86400000; /* ms in one day */
  51static int int_max = INT_MAX;
  52static int sack_timer_min = 1;
  53static int sack_timer_max = 500;
  54static int addr_scope_max = 3; /* check sctp_scope_policy_t in include/net/sctp/constants.h for max entries */
  55static int rwnd_scale_max = 16;
  56static unsigned long max_autoclose_min = 0;
  57static unsigned long max_autoclose_max =
  58        (MAX_SCHEDULE_TIMEOUT / HZ > UINT_MAX)
  59        ? UINT_MAX : MAX_SCHEDULE_TIMEOUT / HZ;
  60
  61extern long sysctl_sctp_mem[3];
  62extern int sysctl_sctp_rmem[3];
  63extern int sysctl_sctp_wmem[3];
  64
  65static int proc_sctp_do_hmac_alg(ctl_table *ctl,
  66                                int write,
  67                                void __user *buffer, size_t *lenp,
  68
  69                                loff_t *ppos);
  70static 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
  96static 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
 303static 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
 351int 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
 367void 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
 376static struct ctl_table_header * sctp_sysctl_header;
 377
 378/* Sysctl registration.  */
 379void sctp_sysctl_register(void)
 380{
 381        sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
 382}
 383
 384/* Sysctl deregistration.  */
 385void sctp_sysctl_unregister(void)
 386{
 387        unregister_net_sysctl_table(sctp_sysctl_header);
 388}
 389
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