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                 .ctl_name       = NET_UNIX_MAX_DGRAM_QLEN,
  20                 .procname       = "max_dgram_qlen",
  21                 .data           = &init_net.unx.sysctl_max_dgram_qlen,
  22                 .maxlen         = sizeof(int),
  23                 .mode           = 0644,
  24                 .proc_handler   = proc_dointvec
  25         },
  26         { .ctl_name = 0 }
  27 };
  28
  29 static struct ctl_path unix_path[] = {
  30         { .procname = "net", .ctl_name = CTL_NET, },
  31         { .procname = "unix", .ctl_name = NET_UNIX, },
  32         { },
  33 };
  34
  35 int unix_sysctl_register(struct net *net)
  36 {
  37         struct ctl_table *table;
  38
  39         table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
  40         if (table == NULL)
  41                 goto err_alloc;
  42
  43         table[0].data = &net->unx.sysctl_max_dgram_qlen;
  44         net->unx.ctl = register_net_sysctl_table(net, unix_path, table);
  45         if (net->unx.ctl == NULL)
  46                 goto err_reg;
  47
  48         return 0;
  49
  50 err_reg:
  51         kfree(table);
  52 err_alloc:
  53         return -ENOMEM;
  54 }
  55
  56 void unix_sysctl_unregister(struct net *net)
  57 {
  58         struct ctl_table *table;
  59
  60         table = net->unx.ctl->ctl_table_arg;
  61         unregister_sysctl_table(net->unx.ctl);
  62         kfree(table);
  63 }