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 ctl_table sctp_table[] = {
  66        {
  67                .procname       = "sctp_mem",
  68                .data           = &sysctl_sctp_mem,
  69                .maxlen         = sizeof(sysctl_sctp_mem),
  70                .mode           = 0644,
  71                .proc_handler   = proc_doulongvec_minmax
  72        },
  73        {
  74                .procname       = "sctp_rmem",
  75                .data           = &sysctl_sctp_rmem,
  76                .maxlen         = sizeof(sysctl_sctp_rmem),
  77                .mode           = 0644,
  78                .proc_handler   = proc_dointvec,
  79        },
  80        {
  81                .procname       = "sctp_wmem",
  82                .data           = &sysctl_sctp_wmem,
  83                .maxlen         = sizeof(sysctl_sctp_wmem),
  84                .mode           = 0644,
  85                .proc_handler   = proc_dointvec,
  86        },
  87
  88        { /* sentinel */ }
  89};
  90
  91static ctl_table sctp_net_table[] = {
  92        {
  93                .procname       = "rto_initial",
  94                .data           = &init_net.sctp.rto_initial,
  95                .maxlen         = sizeof(unsigned int),
  96                .mode           = 0644,
  97                .proc_handler   = proc_dointvec_minmax,
  98                .extra1         = &one,
  99                .extra2         = &timer_max
 100        },
 101        {
 102                .procname       = "rto_min",
 103                .data           = &init_net.sctp.rto_min,
 104                .maxlen         = sizeof(unsigned int),
 105                .mode           = 0644,
 106                .proc_handler   = proc_dointvec_minmax,
 107                .extra1         = &one,
 108                .extra2         = &timer_max
 109        },
 110        {
 111                .procname       = "rto_max",
 112                .data           = &init_net.sctp.rto_max,
 113                .maxlen         = sizeof(unsigned int),
 114                .mode           = 0644,
 115                .proc_handler   = proc_dointvec_minmax,
 116                .extra1         = &one,
 117                .extra2         = &timer_max
 118        },
 119        {
 120                .procname       = "rto_alpha_exp_divisor",
 121                .data           = &init_net.sctp.rto_alpha,
 122                .maxlen         = sizeof(int),
 123                .mode           = 0444,
 124                .proc_handler   = proc_dointvec,
 125        },
 126        {
 127                .procname       = "rto_beta_exp_divisor",
 128                .data           = &init_net.sctp.rto_beta,
 129                .maxlen         = sizeof(int),
 130                .mode           = 0444,
 131                .proc_handler   = proc_dointvec,
 132        },
 133        {
 134                .procname       = "max_burst",
 135                .data           = &init_net.sctp.max_burst,
 136                .maxlen         = sizeof(int),
 137                .mode           = 0644,
 138                .proc_handler   = proc_dointvec_minmax,
 139                .extra1         = &zero,
 140                .extra2         = &int_max
 141        },
 142        {
 143                .procname       = "cookie_preserve_enable",
 144                .data           = &init_net.sctp.cookie_preserve_enable,
 145                .maxlen         = sizeof(int),
 146                .mode           = 0644,
 147                .proc_handler   = proc_dointvec,
 148        },
 149        {
 150                .procname       = "valid_cookie_life",
 151                .data           = &init_net.sctp.valid_cookie_life,
 152                .maxlen         = sizeof(unsigned int),
 153                .mode           = 0644,
 154                .proc_handler   = proc_dointvec_minmax,
 155                .extra1         = &one,
 156                .extra2         = &timer_max
 157        },
 158        {
 159                .procname       = "sack_timeout",
 160                .data           = &init_net.sctp.sack_timeout,
 161                .maxlen         = sizeof(int),
 162                .mode           = 0644,
 163                .proc_handler   = proc_dointvec_minmax,
 164                .extra1         = &sack_timer_min,
 165                .extra2         = &sack_timer_max,
 166        },
 167        {
 168                .procname       = "hb_interval",
 169                .data           = &init_net.sctp.hb_interval,
 170                .maxlen         = sizeof(unsigned int),
 171                .mode           = 0644,
 172                .proc_handler   = proc_dointvec_minmax,
 173                .extra1         = &one,
 174                .extra2         = &timer_max
 175        },
 176        {
 177                .procname       = "association_max_retrans",
 178                .data           = &init_net.sctp.max_retrans_association,
 179                .maxlen         = sizeof(int),
 180                .mode           = 0644,
 181                .proc_handler   = proc_dointvec_minmax,
 182                .extra1         = &one,
 183                .extra2         = &int_max
 184        },
 185        {
 186                .procname       = "path_max_retrans",
 187                .data           = &init_net.sctp.max_retrans_path,
 188                .maxlen         = sizeof(int),
 189                .mode           = 0644,
 190                .proc_handler   = proc_dointvec_minmax,
 191                .extra1         = &one,
 192                .extra2         = &int_max
 193        },
 194        {
 195                .procname       = "max_init_retransmits",
 196                .data           = &init_net.sctp.max_retrans_init,
 197                .maxlen         = sizeof(int),
 198                .mode           = 0644,
 199                .proc_handler   = proc_dointvec_minmax,
 200                .extra1         = &one,
 201                .extra2         = &int_max
 202        },
 203        {
 204                .procname       = "pf_retrans",
 205                .data           = &init_net.sctp.pf_retrans,
 206                .maxlen         = sizeof(int),
 207                .mode           = 0644,
 208                .proc_handler   = proc_dointvec_minmax,
 209                .extra1         = &zero,
 210                .extra2         = &int_max
 211        },
 212        {
 213                .procname       = "sndbuf_policy",
 214                .data           = &init_net.sctp.sndbuf_policy,
 215                .maxlen         = sizeof(int),
 216                .mode           = 0644,
 217                .proc_handler   = proc_dointvec,
 218        },
 219        {
 220                .procname       = "rcvbuf_policy",
 221                .data           = &init_net.sctp.rcvbuf_policy,
 222                .maxlen         = sizeof(int),
 223                .mode           = 0644,
 224                .proc_handler   = proc_dointvec,
 225        },
 226        {
 227                .procname       = "default_auto_asconf",
 228                .data           = &init_net.sctp.default_auto_asconf,
 229                .maxlen         = sizeof(int),
 230                .mode           = 0644,
 231                .proc_handler   = proc_dointvec,
 232        },
 233        {
 234                .procname       = "addip_enable",
 235                .data           = &init_net.sctp.addip_enable,
 236                .maxlen         = sizeof(int),
 237                .mode           = 0644,
 238                .proc_handler   = proc_dointvec,
 239        },
 240        {
 241                .procname       = "addip_noauth_enable",
 242                .data           = &init_net.sctp.addip_noauth,
 243                .maxlen         = sizeof(int),
 244                .mode           = 0644,
 245                .proc_handler   = proc_dointvec,
 246        },
 247        {
 248                .procname       = "prsctp_enable",
 249                .data           = &init_net.sctp.prsctp_enable,
 250                .maxlen         = sizeof(int),
 251                .mode           = 0644,
 252                .proc_handler   = proc_dointvec,
 253        },
 254        {
 255                .procname       = "auth_enable",
 256                .data           = &init_net.sctp.auth_enable,
 257                .maxlen         = sizeof(int),
 258                .mode           = 0644,
 259                .proc_handler   = proc_dointvec,
 260        },
 261        {
 262                .procname       = "addr_scope_policy",
 263                .data           = &init_net.sctp.scope_policy,
 264                .maxlen         = sizeof(int),
 265                .mode           = 0644,
 266                .proc_handler   = proc_dointvec_minmax,
 267                .extra1         = &zero,
 268                .extra2         = &addr_scope_max,
 269        },
 270        {
 271                .procname       = "rwnd_update_shift",
 272                .data           = &init_net.sctp.rwnd_upd_shift,
 273                .maxlen         = sizeof(int),
 274                .mode           = 0644,
 275                .proc_handler   = &proc_dointvec_minmax,
 276                .extra1         = &one,
 277                .extra2         = &rwnd_scale_max,
 278        },
 279        {
 280                .procname       = "max_autoclose",
 281                .data           = &init_net.sctp.max_autoclose,
 282                .maxlen         = sizeof(unsigned long),
 283                .mode           = 0644,
 284                .proc_handler   = &proc_doulongvec_minmax,
 285                .extra1         = &max_autoclose_min,
 286                .extra2         = &max_autoclose_max,
 287        },
 288
 289        { /* sentinel */ }
 290};
 291
 292int sctp_sysctl_net_register(struct net *net)
 293{
 294        struct ctl_table *table;
 295        int i;
 296
 297        table = kmemdup(sctp_net_table, sizeof(sctp_net_table), GFP_KERNEL);
 298        if (!table)
 299                return -ENOMEM;
 300
 301        for (i = 0; table[i].data; i++)
 302                table[i].data += (char *)(&net->sctp) - (char *)&init_net.sctp;
 303
 304        net->sctp.sysctl_header = register_net_sysctl(net, "net/sctp", table);
 305        return 0;
 306}
 307
 308void sctp_sysctl_net_unregister(struct net *net)
 309{
 310        unregister_net_sysctl_table(net->sctp.sysctl_header);
 311}
 312
 313static struct ctl_table_header * sctp_sysctl_header;
 314
 315/* Sysctl registration.  */
 316void sctp_sysctl_register(void)
 317{
 318        sctp_sysctl_header = register_net_sysctl(&init_net, "net/sctp", sctp_table);
 319}
 320
 321/* Sysctl deregistration.  */
 322void sctp_sysctl_unregister(void)
 323{
 324        unregister_net_sysctl_table(sctp_sysctl_header);
 325}
 326
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