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 <net/sctp/sctp.h>
  46 #include <linux/sysctl.h>
  47
  48 static ctl_handler sctp_sysctl_jiffies_ms;
  49 static long rto_timer_min = 1;
  50 static long rto_timer_max = 86400000; /* One day */
  51 static long sack_timer_min = 1;
  52 static long sack_timer_max = 500;
  53
  54 static ctl_table sctp_table[] = {
  55         {
  56                 .ctl_name       = NET_SCTP_RTO_INITIAL,
  57                 .procname       = "rto_initial",
  58                 .data           = &sctp_rto_initial,
  59                 .maxlen         = sizeof(long),
  60                 .mode           = 0644,
  61                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
  62                 .strategy       = &sctp_sysctl_jiffies_ms,
  63                 .extra1         = &rto_timer_min,
  64                 .extra2         = &rto_timer_max
  65         },
  66         {
  67                 .ctl_name       = NET_SCTP_RTO_MIN,
  68                 .procname       = "rto_min",
  69                 .data           = &sctp_rto_min,
  70                 .maxlen         = sizeof(long),
  71                 .mode           = 0644,
  72                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
  73                 .strategy       = &sctp_sysctl_jiffies_ms,
  74                 .extra1         = &rto_timer_min,
  75                 .extra2         = &rto_timer_max
  76         },
  77         {
  78                 .ctl_name       = NET_SCTP_RTO_MAX,
  79                 .procname       = "rto_max",
  80                 .data           = &sctp_rto_max,
  81                 .maxlen         = sizeof(long),
  82                 .mode           = 0644,
  83                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
  84                 .strategy       = &sctp_sysctl_jiffies_ms,
  85                 .extra1         = &rto_timer_min,
  86                 .extra2         = &rto_timer_max
  87         },
  88         {
  89                 .ctl_name       = NET_SCTP_VALID_COOKIE_LIFE,
  90                 .procname       = "valid_cookie_life",
  91                 .data           = &sctp_valid_cookie_life,
  92                 .maxlen         = sizeof(long),
  93                 .mode           = 0644,
  94                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
  95                 .strategy       = &sctp_sysctl_jiffies_ms,
  96                 .extra1         = &rto_timer_min,
  97                 .extra2         = &rto_timer_max
  98         },
  99         {
 100                 .ctl_name       = NET_SCTP_MAX_BURST,
 101                 .procname       = "max_burst",
 102                 .data           = &sctp_max_burst,
 103                 .maxlen         = sizeof(int),
 104                 .mode           = 0644,
 105                 .proc_handler   = &proc_dointvec
 106         },
 107         {
 108                 .ctl_name       = NET_SCTP_ASSOCIATION_MAX_RETRANS,
 109                 .procname       = "association_max_retrans",
 110                 .data           = &sctp_max_retrans_association,
 111                 .maxlen         = sizeof(int),
 112                 .mode           = 0644,
 113                 .proc_handler   = &proc_dointvec
 114         },
 115         {
 116                 .ctl_name       = NET_SCTP_SNDBUF_POLICY,
 117                 .procname       = "sndbuf_policy",
 118                 .data           = &sctp_sndbuf_policy,
 119                 .maxlen         = sizeof(int),
 120                 .mode           = 0644,
 121                 .proc_handler   = &proc_dointvec
 122         },
 123         {
 124                 .ctl_name       = NET_SCTP_RCVBUF_POLICY,
 125                 .procname       = "rcvbuf_policy",
 126                 .data           = &sctp_rcvbuf_policy,
 127                 .maxlen         = sizeof(int),
 128                 .mode           = 0644,
 129                 .proc_handler   = &proc_dointvec
 130         },
 131         {
 132                 .ctl_name       = NET_SCTP_PATH_MAX_RETRANS,
 133                 .procname       = "path_max_retrans",
 134                 .data           = &sctp_max_retrans_path,
 135                 .maxlen         = sizeof(int),
 136                 .mode           = 0644,
 137                 .proc_handler   = &proc_dointvec
 138         },
 139         {
 140                 .ctl_name       = NET_SCTP_MAX_INIT_RETRANSMITS,
 141                 .procname       = "max_init_retransmits",
 142                 .data           = &sctp_max_retrans_init,
 143                 .maxlen         = sizeof(int),
 144                 .mode           = 0644,
 145                 .proc_handler   = &proc_dointvec
 146         },
 147         {
 148                 .ctl_name       = NET_SCTP_HB_INTERVAL,
 149                 .procname       = "hb_interval",
 150                 .data           = &sctp_hb_interval,
 151                 .maxlen         = sizeof(long),
 152                 .mode           = 0644,
 153                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
 154                 .strategy       = &sctp_sysctl_jiffies_ms,
 155                 .extra1         = &rto_timer_min,
 156                 .extra2         = &rto_timer_max
 157         },
 158         {
 159                 .ctl_name       = NET_SCTP_PRESERVE_ENABLE,
 160                 .procname       = "cookie_preserve_enable",
 161                 .data           = &sctp_cookie_preserve_enable,
 162                 .maxlen         = sizeof(int),
 163                 .mode           = 0644,
 164                 .proc_handler   = &proc_dointvec
 165         },
 166         {
 167                 .ctl_name       = NET_SCTP_RTO_ALPHA,
 168                 .procname       = "rto_alpha_exp_divisor",
 169                 .data           = &sctp_rto_alpha,
 170                 .maxlen         = sizeof(int),
 171                 .mode           = 0644,
 172                 .proc_handler   = &proc_dointvec
 173         },
 174         {
 175                 .ctl_name       = NET_SCTP_RTO_BETA,
 176                 .procname       = "rto_beta_exp_divisor",
 177                 .data           = &sctp_rto_beta,
 178                 .maxlen         = sizeof(int),
 179                 .mode           = 0644,
 180                 .proc_handler   = &proc_dointvec
 181         },
 182         {
 183                 .ctl_name       = NET_SCTP_ADDIP_ENABLE,
 184                 .procname       = "addip_enable",
 185                 .data           = &sctp_addip_enable,
 186                 .maxlen         = sizeof(int),
 187                 .mode           = 0644,
 188                 .proc_handler   = &proc_dointvec
 189         },
 190         {
 191                 .ctl_name       = NET_SCTP_PRSCTP_ENABLE,
 192                 .procname       = "prsctp_enable",
 193                 .data           = &sctp_prsctp_enable,
 194                 .maxlen         = sizeof(int),
 195                 .mode           = 0644,
 196                 .proc_handler   = &proc_dointvec
 197         },
 198         {
 199                 .ctl_name       = NET_SCTP_SACK_TIMEOUT,
 200                 .procname       = "sack_timeout",
 201                 .data           = &sctp_sack_timeout,
 202                 .maxlen         = sizeof(long),
 203                 .mode           = 0644,
 204                 .proc_handler   = &proc_doulongvec_ms_jiffies_minmax,
 205                 .strategy       = &sctp_sysctl_jiffies_ms,
 206                 .extra1         = &sack_timer_min,
 207                 .extra2         = &sack_timer_max,
 208         },
 209         { .ctl_name = 0 }
 210 };
 211
 212 static ctl_table sctp_net_table[] = {
 213         {
 214                 .ctl_name       = NET_SCTP,
 215                 .procname       = "sctp",
 216                 .mode           = 0555,
 217                 .child          = sctp_table
 218         },
 219         { .ctl_name = 0 }
 220 };
 221
 222 static ctl_table sctp_root_table[] = {
 223         {
 224                 .ctl_name       = CTL_NET,
 225                 .procname       = "net",
 226                 .mode           = 0555,
 227                 .child          = sctp_net_table
 228         },
 229         { .ctl_name = 0 }
 230 };
 231
 232 static struct ctl_table_header * sctp_sysctl_header;
 233
 234 /* Sysctl registration.  */
 235 void sctp_sysctl_register(void)
 236 {
 237         sctp_sysctl_header = register_sysctl_table(sctp_root_table, 0);
 238 }
 239
 240 /* Sysctl deregistration.  */
 241 void sctp_sysctl_unregister(void)
 242 {
 243         unregister_sysctl_table(sctp_sysctl_header);
 244 }
 245
 246 /* Strategy function to convert jiffies to milliseconds.  */
 247 static int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen,
 248                 void __user *oldval, size_t __user *oldlenp,
 249                 void __user *newval, size_t newlen, void **context) {
 250
 251         if (oldval) {
 252                 size_t olen;
 253
 254                 if (oldlenp) {
 255                         if (get_user(olen, oldlenp))
 256                                 return -EFAULT;
 257
 258                         if (olen != sizeof (int))
 259                                 return -EINVAL;
 260                 }
 261                 if (put_user((*(int *)(table->data) * 1000) / HZ,
 262                         (int __user *)oldval) ||
 263                     (oldlenp && put_user(sizeof (int), oldlenp)))
 264                         return -EFAULT;
 265         }
 266         if (newval && newlen) {
 267                 int new;
 268
 269                 if (newlen != sizeof (int))
 270                         return -EINVAL;
 271
 272                 if (get_user(new, (int __user *)newval))
 273                         return -EFAULT;
 274
 275                 *(int *)(table->data) = (new * HZ) / 1000;
 276         }
 277         return 1;
 278 }