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linux
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tipc
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core.c
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/* * 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);
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