mirror of https://gitee.com/openkylin/linux.git
189 lines
5.0 KiB
C
189 lines
5.0 KiB
C
/*
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* net/tipc/core.c: TIPC module code
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*
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* Copyright (c) 2003-2006, Ericsson AB
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* Copyright (c) 2005-2006, 2010-2013, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "ref.h"
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#include "name_table.h"
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#include "subscr.h"
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#include "config.h"
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#include "port.h"
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#include <linux/module.h>
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/* global variables used by multiple sub-systems within TIPC */
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int tipc_random __read_mostly;
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/* configurable TIPC parameters */
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u32 tipc_own_addr __read_mostly;
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int tipc_max_ports __read_mostly;
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int tipc_net_id __read_mostly;
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int tipc_remote_management __read_mostly;
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int sysctl_tipc_rmem[3] __read_mostly; /* min/default/max */
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/**
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* tipc_buf_acquire - creates a TIPC message buffer
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* @size: message size (including TIPC header)
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*
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* Returns a new buffer with data pointers set to the specified size.
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*
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* NOTE: Headroom is reserved to allow prepending of a data link header.
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* There may also be unrequested tailroom present at the buffer's end.
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*/
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struct sk_buff *tipc_buf_acquire(u32 size)
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{
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struct sk_buff *skb;
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unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
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skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
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if (skb) {
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skb_reserve(skb, BUF_HEADROOM);
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skb_put(skb, size);
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skb->next = NULL;
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}
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return skb;
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}
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/**
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* tipc_core_stop_net - shut down TIPC networking sub-systems
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*/
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static void tipc_core_stop_net(void)
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{
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tipc_net_stop();
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tipc_bearer_cleanup();
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}
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/**
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* start_net - start TIPC networking sub-systems
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*/
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int tipc_core_start_net(unsigned long addr)
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{
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int res;
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tipc_net_start(addr);
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res = tipc_bearer_setup();
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if (res < 0)
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goto err;
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return res;
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err:
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tipc_core_stop_net();
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return res;
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}
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/**
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* tipc_core_stop - switch TIPC from SINGLE NODE to NOT RUNNING mode
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*/
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static void tipc_core_stop(void)
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{
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tipc_netlink_stop();
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tipc_cfg_stop();
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tipc_subscr_stop();
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tipc_nametbl_stop();
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tipc_ref_table_stop();
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tipc_socket_stop();
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tipc_unregister_sysctl();
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}
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/**
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* tipc_core_start - switch TIPC from NOT RUNNING to SINGLE NODE mode
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*/
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static int tipc_core_start(void)
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{
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int res;
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get_random_bytes(&tipc_random, sizeof(tipc_random));
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res = tipc_handler_start();
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if (!res)
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res = tipc_ref_table_init(tipc_max_ports, tipc_random);
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if (!res)
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res = tipc_nametbl_init();
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if (!res)
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res = tipc_netlink_start();
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if (!res)
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res = tipc_socket_init();
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if (!res)
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res = tipc_register_sysctl();
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if (!res)
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res = tipc_subscr_start();
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if (!res)
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res = tipc_cfg_init();
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if (res) {
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tipc_handler_stop();
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tipc_core_stop();
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}
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return res;
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}
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static int __init tipc_init(void)
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{
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int res;
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pr_info("Activated (version " TIPC_MOD_VER ")\n");
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tipc_own_addr = 0;
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tipc_remote_management = 1;
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tipc_max_ports = CONFIG_TIPC_PORTS;
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tipc_net_id = 4711;
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sysctl_tipc_rmem[0] = CONN_OVERLOAD_LIMIT >> 4 << TIPC_LOW_IMPORTANCE;
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sysctl_tipc_rmem[1] = CONN_OVERLOAD_LIMIT >> 4 <<
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TIPC_CRITICAL_IMPORTANCE;
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sysctl_tipc_rmem[2] = CONN_OVERLOAD_LIMIT;
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res = tipc_core_start();
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if (res)
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pr_err("Unable to start in single node mode\n");
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else
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pr_info("Started in single node mode\n");
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return res;
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}
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static void __exit tipc_exit(void)
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{
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tipc_handler_stop();
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tipc_core_stop_net();
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tipc_core_stop();
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pr_info("Deactivated\n");
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}
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module_init(tipc_init);
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module_exit(tipc_exit);
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MODULE_DESCRIPTION("TIPC: Transparent Inter Process Communication");
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MODULE_LICENSE("Dual BSD/GPL");
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MODULE_VERSION(TIPC_MOD_VER);
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