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Diffstat (limited to 'net/tipc/core.c')
| -rw-r--r-- | net/tipc/core.c | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/net/tipc/core.c b/net/tipc/core.c new file mode 100644 index 00000000..943b6af8 --- /dev/null +++ b/net/tipc/core.c @@ -0,0 +1,211 @@ +/* + * 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" + + +#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; + +const char tipc_alphabet[] = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_."; + +/* configurable TIPC parameters */ + +u32 tipc_own_addr; +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; + + res = tipc_net_start(addr); + if (!res) + res = tipc_eth_media_start(); + if (res) + 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; + + 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_k_signal((Handler)tipc_subscr_start, 0); + if (!res) + res = tipc_k_signal((Handler)tipc_cfg_init, 0); + 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; + + if (tipc_log_resize(CONFIG_TIPC_LOG) != 0) + warn("Unable to create log buffer\n"); + + info("Activated (version " TIPC_MOD_VER ")\n"); + + tipc_own_addr = 0; + tipc_remote_management = 1; + tipc_max_publications = 10000; + tipc_max_subscriptions = 2000; + tipc_max_ports = CONFIG_TIPC_PORTS; + tipc_net_id = 4711; + + res = tipc_core_start(); + if (res) + 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); |