sysctl_net_ax25.c

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/*
 * 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.
 *
 * Copyright (C) 1996 Mike Shaver ([email protected])
 */
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/spinlock.h>
#include <net/ax25.h>

static int min_ipdefmode[1],        max_ipdefmode[] = {1};
static int min_axdefmode[1],            max_axdefmode[] = {1};
static int min_backoff[1],      max_backoff[] = {2};
static int min_conmode[1],      max_conmode[] = {2};
static int min_window[] = {1},      max_window[] = {7};
static int min_ewindow[] = {1},     max_ewindow[] = {63};
static int min_t1[] = {1},      max_t1[] = {30000};
static int min_t2[] = {1},      max_t2[] = {20000};
static int min_t3[1],           max_t3[] = {3600000};
static int min_idle[1],         max_idle[] = {65535000};
static int min_n2[] = {1},      max_n2[] = {31};
static int min_paclen[] = {1},      max_paclen[] = {512};
static int min_proto[1],        max_proto[] = { AX25_PROTO_MAX };
#ifdef CONFIG_AX25_DAMA_SLAVE
static int min_ds_timeout[1],       max_ds_timeout[] = {65535000};
#endif

static const ctl_table ax25_param_table[] = {
    {
        .procname   = "ip_default_mode",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_ipdefmode,
        .extra2     = &max_ipdefmode
    },
    {
        .procname   = "ax25_default_mode",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_axdefmode,
        .extra2     = &max_axdefmode
    },
    {
        .procname   = "backoff_type",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_backoff,
        .extra2     = &max_backoff
    },
    {
        .procname   = "connect_mode",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_conmode,
        .extra2     = &max_conmode
    },
    {
        .procname   = "standard_window_size",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_window,
        .extra2     = &max_window
    },
    {
        .procname   = "extended_window_size",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_ewindow,
        .extra2     = &max_ewindow
    },
    {
        .procname   = "t1_timeout",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_t1,
        .extra2     = &max_t1
    },
    {
        .procname   = "t2_timeout",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_t2,
        .extra2     = &max_t2
    },
    {
        .procname   = "t3_timeout",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_t3,
        .extra2     = &max_t3
    },
    {
        .procname   = "idle_timeout",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_idle,
        .extra2     = &max_idle
    },
    {
        .procname   = "maximum_retry_count",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_n2,
        .extra2     = &max_n2
    },
    {
        .procname   = "maximum_packet_length",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_paclen,
        .extra2     = &max_paclen
    },
    {
        .procname   = "protocol",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_proto,
        .extra2     = &max_proto
    },
#ifdef CONFIG_AX25_DAMA_SLAVE
    {
        .procname   = "dama_slave_timeout",
        .maxlen     = sizeof(int),
        .mode       = 0644,
        .proc_handler   = proc_dointvec_minmax,
        .extra1     = &min_ds_timeout,
        .extra2     = &max_ds_timeout
    },
#endif

    { } /* that's all, folks! */
};

int ax25_register_dev_sysctl(ax25_dev *ax25_dev)
{
    char path[sizeof("net/ax25/") + IFNAMSIZ];
    int k;
    struct ctl_table *table;

    table = kmemdup(ax25_param_table, sizeof(ax25_param_table), GFP_KERNEL);
    if (!table)
        return -ENOMEM;

    for (k = 0; k < AX25_MAX_VALUES; k++)
        table[k].data = &ax25_dev->values[k];

    snprintf(path, sizeof(path), "net/ax25/%s", ax25_dev->dev->name);
    ax25_dev->sysheader = register_net_sysctl(&init_net, path, table);
    if (!ax25_dev->sysheader) {
        kfree(table);
        return -ENOMEM;
    }
    return 0;
}

void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev)
{
    struct ctl_table_header *header = ax25_dev->sysheader;
    struct ctl_table *table;

    if (header) {
        ax25_dev->sysheader = NULL;
        table = header->ctl_table_arg;
        unregister_net_sysctl_table(header);
        kfree(table);
    }
}