/* * net/tipc/core.c: TIPC module code * * Copyright (c) 2003-2006, Ericsson AB * Copyright (c) 2005-2006, 2010-2013, 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 "port.h" #include <linux/module.h> /* 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;int sysctl_tipc_rmem[3] __read_mostly;	/* min/default/max */ /** * tipc_buf_acquire - creates a TIPC message buffer * @size: message size (including TIPC header) * * Returns a new buffer with data pointers set to the specified size. * * NOTE: Headroom is reserved to allow prepending of a data link header. *       There may also be unrequested tailroom present at the buffer's end. */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;} /** * tipc_core_stop_net - shut down TIPC networking sub-systems */static void tipc_core_stop_net(void){	tipc_net_stop();	tipc_eth_media_stop();	tipc_ib_media_stop();} /** * start_net - start TIPC networking sub-systems */int tipc_core_start_net(unsigned long addr){	int res; 	tipc_net_start(addr);	res = tipc_eth_media_start();	if (res < 0)		goto err;	res = tipc_ib_media_start();	if (res < 0)		goto err;	return res; err:	tipc_core_stop_net();	return res;} /** * tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode */static void tipc_core_stop(void){	tipc_netlink_stop();	tipc_cfg_stop();	tipc_subscr_stop();	tipc_nametbl_stop();	tipc_ref_table_stop();	tipc_socket_stop();	tipc_unregister_sysctl();} /** * tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode */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_netlink_start();	if (!res)		res = tipc_socket_init();	if (!res)		res = tipc_register_sysctl();	if (!res)		res = tipc_subscr_start();	if (!res)		res = tipc_cfg_init();	if (res) {		tipc_handler_stop();		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; 	sysctl_tipc_rmem[0] = CONN_OVERLOAD_LIMIT >> 4 << TIPC_LOW_IMPORTANCE;	sysctl_tipc_rmem[1] = CONN_OVERLOAD_LIMIT >> 4 <<			      TIPC_CRITICAL_IMPORTANCE;	sysctl_tipc_rmem[2] = CONN_OVERLOAD_LIMIT; 	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_handler_stop();	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);