sysctl_net_unix.c

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/*
 * NET4:    Sysctl interface to net af_unix subsystem.
 *
 * Authors: Mike Shaver.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/sysctl.h>

#include <net/af_unix.h>

static ctl_table unix_table[] = {
    {
        .procname   = "max_dgram_qlen",
        .data       = &init_net.unx.sysctl_max_dgram_qlen,
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec
    },
    { }
};

int __net_init unix_sysctl_register(struct net *net)
{
    struct ctl_table *table;

    table = kmemdup(unix_table, sizeof(unix_table), GFP_KERNEL);
    if (table == NULL)
        goto err_alloc;

    table[0].data = &net->unx.sysctl_max_dgram_qlen;
    net->unx.ctl = register_net_sysctl(net, "net/unix", table);
    if (net->unx.ctl == NULL)
        goto err_reg;

    return 0;

err_reg:
    kfree(table);
err_alloc:
    return -ENOMEM;
}

void unix_sysctl_unregister(struct net *net)
{
    struct ctl_table *table;

    table = net->unx.ctl->ctl_table_arg;
    unregister_net_sysctl_table(net->unx.ctl);
    kfree(table);
}