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 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 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 32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 34 * POSSIBILITY OF SUCH DAMAGE. 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 */ 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