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/*
* net/tipc/core.c: TIPC module code
*
* Copyright (c) 2003-2006, Ericsson AB
* Copyright (c) 2005-2006, 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"
#ifndef CONFIG_TIPC_NODES
#define CONFIG_TIPC_NODES 255
#endif
#ifndef CONFIG_TIPC_PORTS
#define CONFIG_TIPC_PORTS 8191
#endif
#ifndef CONFIG_TIPC_LOG
#define CONFIG_TIPC_LOG 0
#endif
/* global variables used by multiple sub-systems within TIPC */
int tipc_mode = TIPC_NOT_RUNNING;
int tipc_random;
atomic_t tipc_user_count = ATOMIC_INIT(0);
const char tipc_alphabet[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_.";
/* configurable TIPC parameters */
u32 tipc_own_addr;
int tipc_max_nodes;
int tipc_max_ports;
int tipc_max_subscriptions;
int tipc_max_publications;
int tipc_net_id;
int tipc_remote_management;
/**
* 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_eth_media_stop();
tipc_net_stop();
}
/**
* start_net - start TIPC networking sub-systems
*/
int tipc_core_start_net(unsigned long addr)
{
int res;
if ((res = tipc_net_start(addr)) ||
(res = tipc_eth_media_start())) {
tipc_core_stop_net();
}
return res;
}
/**
* tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
*/
static void tipc_core_stop(void)
{
if (tipc_mode != TIPC_NODE_MODE)
return;
tipc_mode = TIPC_NOT_RUNNING;
tipc_netlink_stop();
tipc_handler_stop();
tipc_cfg_stop();
tipc_subscr_stop();
tipc_nametbl_stop();
tipc_ref_table_stop();
tipc_socket_stop();
tipc_log_resize(0);
}
/**
* tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
*/
static int tipc_core_start(void)
{
int res;
if (tipc_mode != TIPC_NOT_RUNNING)
return -ENOPROTOOPT;
get_random_bytes(&tipc_random, sizeof(tipc_random));
tipc_mode = TIPC_NODE_MODE;
if ((res = tipc_handler_start()) ||
(res = tipc_ref_table_init(tipc_max_ports, tipc_random)) ||
(res = tipc_nametbl_init()) ||
(res = tipc_k_signal((Handler)tipc_subscr_start, 0)) ||
(res = tipc_k_signal((Handler)tipc_cfg_init, 0)) ||
(res = tipc_netlink_start()) ||
(res = tipc_socket_init())) {
tipc_core_stop();
}
return res;
}
static int __init tipc_init(void)
{
int res;
if (tipc_log_resize(CONFIG_TIPC_LOG) != 0)
warn("Unable to create log buffer\n");
info("Activated (version " TIPC_MOD_VER
" compiled " __DATE__ " " __TIME__ ")\n");
tipc_own_addr = 0;
tipc_remote_management = 1;
tipc_max_publications = 10000;
tipc_max_subscriptions = 2000;
tipc_max_ports = CONFIG_TIPC_PORTS;
tipc_max_nodes = CONFIG_TIPC_NODES;
tipc_net_id = 4711;
if ((res = tipc_core_start()))
err("Unable to start in single node mode\n");
else
info("Started in single node mode\n");
return res;
}
static void __exit tipc_exit(void)
{
tipc_core_stop_net();
tipc_core_stop();
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);
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