LXR linux/net/tipc/udp

   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
  44int tipc_udp_nl_bearer_add(struct tipc_bearer *b, struct nlattr *attr);
  45int tipc_udp_nl_add_bearer_data(struct tipc_nl_msg *msg, struct tipc_bearer *b);
  46int 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 */
  49static 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