net/tipc/udp_media.h

   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