net/sctp/sysctl.c

   1 /* SCTP kernel reference Implementation
   2  * (C) Copyright IBM Corp. 2002, 2004
   3  * Copyright (c) 2002 Intel Corp.
   4  *
   5  * This file is part of the SCTP kernel reference Implementation
   6  *
   7  * Sysctl related interfaces for SCTP.
   8  *
   9  * The SCTP reference 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  * The SCTP reference 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 <linux/sysctl.h>
  46
  47 static ctl_handler sctp_sysctl_jiffies_ms;
  48 static long rto_timer_min = 1;
  49 static long rto_timer_max = 86400000; /* One day */
  50 static long sack_timer_min = 1;
  51 static long sack_timer_max = 500;
  52
  53 static ctl_table sctp_table[] = {
  54         {
  55                 .ctl_name       = NET_SCTP_RTO_INITIAL,
  56                 .procname       = "rto_initial",
  57                 .data           = &sctp_rto_initial,
  58                 .maxlen         = sizeof(long),
  59                 .mode           = 0644,
  60                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
  61                 .strategy       = &sctp_sysctl_jiffies_ms,
  62                 .extra1         = &rto_timer_min,
  63                 .extra2         = &rto_timer_max
  64         },
  65         {
  66                 .ctl_name       = NET_SCTP_RTO_MIN,
  67                 .procname       = "rto_min",
  68                 .data           = &sctp_rto_min,
  69                 .maxlen         = sizeof(long),
  70                 .mode           = 0644,
  71                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
  72                 .strategy       = &sctp_sysctl_jiffies_ms,
  73                 .extra1         = &rto_timer_min,
  74                 .extra2         = &rto_timer_max
  75         },
  76         {
  77                 .ctl_name       = NET_SCTP_RTO_MAX,
  78                 .procname       = "rto_max",
  79                 .data           = &sctp_rto_max,
  80                 .maxlen         = sizeof(long),
  81                 .mode           = 0644,
  82                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
  83                 .strategy       = &sctp_sysctl_jiffies_ms,
  84                 .extra1         = &rto_timer_min,
  85                 .extra2         = &rto_timer_max
  86         },
  87         {
  88                 .ctl_name       = NET_SCTP_VALID_COOKIE_LIFE,
  89                 .procname       = "valid_cookie_life",
  90                 .data           = &sctp_valid_cookie_life,
  91                 .maxlen         = sizeof(long),
  92                 .mode           = 0644,
  93                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
  94                 .strategy       = &sctp_sysctl_jiffies_ms,
  95                 .extra1         = &rto_timer_min,
  96                 .extra2         = &rto_timer_max
  97         },
  98         {
  99                 .ctl_name       = NET_SCTP_MAX_BURST,
 100                 .procname       = "max_burst",
 101                 .data           = &sctp_max_burst,
 102                 .maxlen         = sizeof(int),
 103                 .mode           = 0644,
 104                 .proc_handler   = &proc_dointvec
 105         },
 106         {
 107                 .ctl_name       = NET_SCTP_ASSOCIATION_MAX_RETRANS,
 108                 .procname       = "association_max_retrans",
 109                 .data           = &sctp_max_retrans_association,
 110                 .maxlen         = sizeof(int),
 111                 .mode           = 0644,
 112                 .proc_handler   = &proc_dointvec
 113         },
 114         {
 115                 .ctl_name       = NET_SCTP_SNDBUF_POLICY,
 116                 .procname       = "sndbuf_policy",
 117                 .data           = &sctp_sndbuf_policy,
 118                 .maxlen         = sizeof(int),
 119                 .mode           = 0644,
 120                 .proc_handler   = &proc_dointvec
 121         },
 122         {
 123                 .ctl_name       = NET_SCTP_PATH_MAX_RETRANS,
 124                 .procname       = "path_max_retrans",
 125                 .data           = &sctp_max_retrans_path,
 126                 .maxlen         = sizeof(int),
 127                 .mode           = 0644,
 128                 .proc_handler   = &proc_dointvec
 129         },
 130         {
 131                 .ctl_name       = NET_SCTP_MAX_INIT_RETRANSMITS,
 132                 .procname       = "max_init_retransmits",
 133                 .data           = &sctp_max_retrans_init,
 134                 .maxlen         = sizeof(int),
 135                 .mode           = 0644,
 136                 .proc_handler   = &proc_dointvec
 137         },
 138         {
 139                 .ctl_name       = NET_SCTP_HB_INTERVAL,
 140                 .procname       = "hb_interval",
 141                 .data           = &sctp_hb_interval,
 142                 .maxlen         = sizeof(long),
 143                 .mode           = 0644,
 144                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
 145                 .strategy       = &sctp_sysctl_jiffies_ms,
 146                 .extra1         = &rto_timer_min,
 147                 .extra2         = &rto_timer_max
 148         },
 149         {
 150                 .ctl_name       = NET_SCTP_PRESERVE_ENABLE,
 151                 .procname       = "cookie_preserve_enable",
 152                 .data           = &sctp_cookie_preserve_enable,
 153                 .maxlen         = sizeof(long),
 154                 .mode           = 0644,
 155                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
 156                 .strategy       = &sctp_sysctl_jiffies_ms,
 157                 .extra1         = &rto_timer_min,
 158                 .extra2         = &rto_timer_max
 159         },
 160         {
 161                 .ctl_name       = NET_SCTP_RTO_ALPHA,
 162                 .procname       = "rto_alpha_exp_divisor",
 163                 .data           = &sctp_rto_alpha,
 164                 .maxlen         = sizeof(int),
 165                 .mode           = 0644,
 166                 .proc_handler   = &proc_dointvec
 167         },
 168         {
 169                 .ctl_name       = NET_SCTP_RTO_BETA,
 170                 .procname       = "rto_beta_exp_divisor",
 171                 .data           = &sctp_rto_beta,
 172                 .maxlen         = sizeof(int),
 173                 .mode           = 0644,
 174                 .proc_handler   = &proc_dointvec
 175         },
 176         {
 177                 .ctl_name       = NET_SCTP_ADDIP_ENABLE,
 178                 .procname       = "addip_enable",
 179                 .data           = &sctp_addip_enable,
 180                 .maxlen         = sizeof(int),
 181                 .mode           = 0644,
 182                 .proc_handler   = &proc_dointvec
 183         },
 184         {
 185                 .ctl_name       = NET_SCTP_PRSCTP_ENABLE,
 186                 .procname       = "prsctp_enable",
 187                 .data           = &sctp_prsctp_enable,
 188                 .maxlen         = sizeof(int),
 189                 .mode           = 0644,
 190                 .proc_handler   = &proc_dointvec
 191         },
 192         {
 193                 .ctl_name       = NET_SCTP_SACK_TIMEOUT,
 194                 .procname       = "sack_timeout",
 195                 .data           = &sctp_sack_timeout,
 196                 .maxlen         = sizeof(long),
 197                 .mode           = 0644,
 198                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
 199                 .strategy       = &sctp_sysctl_jiffies_ms,
 200                 .extra1         = &sack_timer_min,
 201                 .extra2         = &sack_timer_max,
 202         },
 203         { .ctl_name = 0 }
 204 };
 205
 206 static ctl_table sctp_net_table[] = {
 207         {
 208                 .ctl_name       = NET_SCTP,
 209                 .procname       = "sctp",
 210                 .mode           = 0555,
 211                 .child          = sctp_table
 212         },
 213         { .ctl_name = 0 }
 214 };
 215
 216 static ctl_table sctp_root_table[] = {
 217         {
 218                 .ctl_name       = CTL_NET,
 219                 .procname       = "net",
 220                 .mode           = 0555,
 221                 .child          = sctp_net_table
 222         },
 223         { .ctl_name = 0 }
 224 };
 225
 226 static struct ctl_table_header * sctp_sysctl_header;
 227
 228 /* Sysctl registration.  */
 229 void sctp_sysctl_register(void)
 230 {
 231         sctp_sysctl_header = register_sysctl_table(sctp_root_table, 0);
 232 }
 233
 234 /* Sysctl deregistration.  */
 235 void sctp_sysctl_unregister(void)
 236 {
 237         unregister_sysctl_table(sctp_sysctl_header);
 238 }
 239
 240 /* Strategy function to convert jiffies to milliseconds.  */
 241 static int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
 242                 void __user *oldval, size_t __user *oldlenp,
 243                 void __user *newval, size_t newlen, void **context) {
 244
 245         if (oldval) {
 246                 size_t olen;
 247
 248                 if (oldlenp) {
 249                         if (get_user(olen, oldlenp))
 250                                 return -EFAULT;
 251
 252                         if (olen != sizeof (int))
 253                                 return -EINVAL;
 254                 }
 255                 if (put_user((*(int *)(table->data) * 1000) / HZ,
 256                         (int __user *)oldval) ||
 257                     (oldlenp && put_user(sizeof (int), oldlenp)))
 258                         return -EFAULT;
 259         }
 260         if (newval && newlen) {
 261                 int new;
 262
 263                 if (newlen != sizeof (int))
 264                         return -EINVAL;
 265
 266                 if (get_user(new, (int __user *)newval))
 267                         return -EFAULT;
 268
 269                 *(int *)(table->data) = (new * HZ) / 1000;
 270         }
 271         return 1;
 272 }