net/unix/sysctl_net_unix.c

   1 /*
   2  * NET4:        Sysctl interface to net af_unix subsystem.
   3  *
   4  * Authors:     Mike Shaver.
   5  *
   6  *              This program is free software; you can redistribute it and/or
   7  *              modify it under the terms of the GNU General Public License
   8  *              as published by the Free Software Foundation; either version
   9  *              2 of the License, or (at your option) any later version.
  10  */
  11
  12 #include <linux/mm.h>
  13 #include <linux/sysctl.h>
  14
  15 #include <net/af_unix.h>
  16
  17 static ctl_table unix_table[] = {
  18         {
  19                 .procname       = "max_dgram_qlen",
  20                 .data           = &init_net.unx.sysctl_max_dgram_qlen,
  21                 .maxlen         = sizeof(int),
  22                 .mode           = 0644,
  23                 .proc_handler   = proc_dointvec
  24         },
  25         { }
  26 };
  27
  28 static struct ctl_path unix_path[] = {
  29         { .procname = "net", },
  30         { .procname = "unix", },
  31         { },
  32 };
  33
  34 int unix_sysctl_register(struct net *net)
  35 {
  36         struct ctl_table *table;
  37
  38         table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
  39         if (table == NULL)
  40                 goto err_alloc;
  41
  42         table[0].data = &net->unx.sysctl_max_dgram_qlen;
  43         net->unx.ctl = register_net_sysctl_table(net, unix_path, table);
  44         if (net->unx.ctl == NULL)
  45                 goto err_reg;
  46
  47         return 0;
  48
  49 err_reg:
  50         kfree(table);
  51 err_alloc:
  52         return -ENOMEM;
  53 }
  54
  55 void unix_sysctl_unregister(struct net *net)
  56 {
  57         struct ctl_table *table;
  58
  59         table = net->unx.ctl->ctl_table_arg;
  60         unregister_sysctl_table(net->unx.ctl);
  61         kfree(table);
  62 }