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Linux/net/unix/sysctl_net_unix.c

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  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/slab.h>
 14 #include <linux/sysctl.h>
 15 
 16 #include <net/af_unix.h>
 17 
 18 static struct ctl_table unix_table[] = {
 19         {
 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         { }
 27 };
 28 
 29 int __net_init unix_sysctl_register(struct net *net)
 30 {
 31         struct ctl_table *table;
 32 
 33         table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
 34         if (table == NULL)
 35                 goto err_alloc;
 36 
 37         /* Don't export sysctls to unprivileged users */
 38         if (net->user_ns != &init_user_ns)
 39                 table[0].procname = NULL;
 40 
 41         table[0].data = &net->unx.sysctl_max_dgram_qlen;
 42         net->unx.ctl = register_net_sysctl(net, "net/unix", table);
 43         if (net->unx.ctl == NULL)
 44                 goto err_reg;
 45 
 46         return 0;
 47 
 48 err_reg:
 49         kfree(table);
 50 err_alloc:
 51         return -ENOMEM;
 52 }
 53 
 54 void unix_sysctl_unregister(struct net *net)
 55 {
 56         struct ctl_table *table;
 57 
 58         table = net->unx.ctl->ctl_table_arg;
 59         unregister_net_sysctl_table(net->unx.ctl);
 60         kfree(table);
 61 }
 62 

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