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