1 /*
2  * net/tipc/udp_media.h: Include file for UDP bearer media
3  *
4  * Copyright (c) 1996-2006, 2013-2016, Ericsson AB
5  * Copyright (c) 2005, 2010-2011, Wind River Systems
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the names of the copyright holders nor the names of its
17  *    contributors may be used to endorse or promote products derived from
18  *    this software without specific prior written permission.
19  *
20  * Alternatively, this software may be distributed under the terms of the
21  * GNU General Public License ("GPL") version 2 as published by the Free
22  * Software Foundation.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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35  */
36 
37 #ifdef CONFIG_TIPC_MEDIA_UDP
38 #ifndef _TIPC_UDP_MEDIA_H
39 #define _TIPC_UDP_MEDIA_H
40 
41 #include <linux/ip.h>
42 #include <linux/udp.h>
43 
44 int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr);
45 int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b);
46 int tipc_udp_nl_dump_remoteip(struct sk_buff *skb, struct netlink_callback *cb);
47 
48 /* check if configured MTU is too low for tipc headers */
tipc_udp_mtu_bad(u32 mtu)49 static inline bool tipc_udp_mtu_bad(u32 mtu)
50 {
51 	if (mtu >= (TIPC_MIN_BEARER_MTU + sizeof(struct iphdr) +
52 	    sizeof(struct udphdr)))
53 		return false;
54 
55 	pr_warn("MTU too low for tipc bearer\n");
56 	return true;
57 }
58 
59 #endif
60 #endif
61