core.c

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/*
 * net/tipc/core.c: TIPC module code
 *
 * Copyright (c) 2003-2006, Ericsson AB
 * Copyright (c) 2005-2006, 2010-2011, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "core.h"
#include "ref.h"
#include "name_table.h"
#include "subscr.h"
#include "config.h"

#include <linux/module.h>

#ifndef CONFIG_TIPC_PORTS
#define CONFIG_TIPC_PORTS 8191
#endif


/* global variables used by multiple sub-systems within TIPC */
int tipc_random __read_mostly;

/* configurable TIPC parameters */
u32 tipc_own_addr __read_mostly;
int tipc_max_ports __read_mostly;
int tipc_net_id __read_mostly;
int tipc_remote_management __read_mostly;


struct sk_buff *tipc_buf_acquire(u32 size)
{
    struct sk_buff *skb;
    unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;

    skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
    if (skb) {
        skb_reserve(skb, BUF_HEADROOM);
        skb_put(skb, size);
        skb->next = NULL;
    }
    return skb;
}

static void tipc_core_stop_net(void)
{
    tipc_net_stop();
    tipc_eth_media_stop();
}

int tipc_core_start_net(unsigned long addr)
{
    int res;

    tipc_net_start(addr);
    res = tipc_eth_media_start();
    if (res)
        tipc_core_stop_net();
    return res;
}

static void tipc_core_stop(void)
{
    tipc_netlink_stop();
    tipc_handler_stop();
    tipc_cfg_stop();
    tipc_subscr_stop();
    tipc_nametbl_stop();
    tipc_ref_table_stop();
    tipc_socket_stop();
}

static int tipc_core_start(void)
{
    int res;

    get_random_bytes(&tipc_random, sizeof(tipc_random));

    res = tipc_handler_start();
    if (!res)
        res = tipc_ref_table_init(tipc_max_ports, tipc_random);
    if (!res)
        res = tipc_nametbl_init();
    if (!res)
        res = tipc_subscr_start();
    if (!res)
        res = tipc_cfg_init();
    if (!res)
        res = tipc_netlink_start();
    if (!res)
        res = tipc_socket_init();
    if (res)
        tipc_core_stop();

    return res;
}


static int __init tipc_init(void)
{
    int res;

    pr_info("Activated (version " TIPC_MOD_VER ")\n");

    tipc_own_addr = 0;
    tipc_remote_management = 1;
    tipc_max_ports = CONFIG_TIPC_PORTS;
    tipc_net_id = 4711;

    res = tipc_core_start();
    if (res)
        pr_err("Unable to start in single node mode\n");
    else
        pr_info("Started in single node mode\n");
    return res;
}

static void __exit tipc_exit(void)
{
    tipc_core_stop_net();
    tipc_core_stop();
    pr_info("Deactivated\n");
}

module_init(tipc_init);
module_exit(tipc_exit);

MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(TIPC_MOD_VER);