net/tipc/udp_media.h

0001 /*
0002  * net/tipc/udp_media.h: Include file for UDP bearer media
0003  *
0004  * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
0005  * Copyright (c) 2005, 2010-2011, Wind River Systems
0006  * All rights reserved.
0007  *
0008  * Redistribution and use in source and binary forms, with or without
0009  * modification, are permitted provided that the following conditions are met:
0010  *
0011  * 1. Redistributions of source code must retain the above copyright
0012  *    notice, this list of conditions and the following disclaimer.
0013  * 2. Redistributions in binary form must reproduce the above copyright
0014  *    notice, this list of conditions and the following disclaimer in the
0015  *    documentation and/or other materials provided with the distribution.
0016  * 3. Neither the names of the copyright holders nor the names of its
0017  *    contributors may be used to endorse or promote products derived from
0018  *    this software without specific prior written permission.
0019  *
0020  * Alternatively, this software may be distributed under the terms of the
0021  * GNU General Public License ("GPL") version 2 as published by the Free
0022  * Software Foundation.
0023  *
0024  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0025  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0026  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0027  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0028  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0029  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0030  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0031  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0032  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0033  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0034  * POSSIBILITY OF SUCH DAMAGE.
0035  */
0036
0037 #ifdef CONFIG_TIPC_MEDIA_UDP
0038 #ifndef _TIPC_UDP_MEDIA_H
0039 #define _TIPC_UDP_MEDIA_H
0040
0041 #include <linux/ip.h>
0042 #include <linux/udp.h>
0043
0044 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr);
0045 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b);
0046 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb);
0047
0048 /* check if configured MTU is too low for tipc headers */
0049 static inline bool tipc_udp_mtu_bad(u32 mtu)
0050 {
0051     if (mtu >= (TIPC_MIN_BEARER_MTU + sizeof(struct iphdr) +
0052         sizeof(struct udphdr)))
0053         return false;
0054
0055     pr_warn("MTU too low for tipc bearer\n");
0056     return true;
0057 }
0058
0059 #endif
0060 #endif