text: #ifndef _BMF_NETWORKINTERFACES_H
  #define _BMF_NETWORKINTERFACES_H
  
  /*
   * OLSR Basic Multicast Forwarding (BMF) plugin.
   * Copyright (c) 2005 - 2007, Thales Communications, Huizen, The Netherlands.
   * Written by Erik Tromp.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * * Redistributions of source code must retain the above copyright
   *   notice, this list of conditions and the following disclaimer.
   * * Redistributions in binary form must reproduce the above copyright
   *   notice, this list of conditions and the following disclaimer in
   *   the documentation and/or other materials provided with the
   *   distribution.
   * * Neither the name of Thales, BMF nor the names of its
   *   contributors may be used to endorse or promote products derived
   *   from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
   * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /* -------------------------------------------------------------------------
   * File       : NetworkInterfaces.h
   * Description: Functions to open and close sockets
   * Created    : 29 Jun 2006
   *
   * ------------------------------------------------------------------------- */
  
  /* System includes */
  #include <netinet/in.h>         /* struct in_addr */
  
  /* OLSR includes */
  #include "olsr_types.h"         /* olsr_ip_addr */
  #include "olsrd_plugin.h"       /* union set_plugin_parameter_addon */
  
  /* Plugin includes */
  #include "Packet.h"             /* IFHWADDRLEN */
  
  /* Size of buffer in which packets are received */
  #define BMF_BUFFER_SIZE 2048
  
  struct TBmfInterface {
    /* File descriptor of raw packet socket, used for capturing multicast packets */
    int capturingSkfd;
  
    /* File descriptor of UDP (datagram) socket for encapsulated multicast packets.
     * Only used for OLSR-enabled interfaces; set to -1 if interface is not OLSR-enabled. */
    int encapsulatingSkfd;
  
    /* File descriptor of UDP packet socket, used for listening to encapsulation packets.
     * Used only when PlParam "BmfMechanism" is set to "UnicastPromiscuous". */
    int listeningSkfd;
  
    unsigned char macAddr[IFHWADDRLEN];
  
    char ifName[IFNAMSIZ];
  
    /* OLSRs idea of this network interface. NULL if this interface is not
     * OLSR-enabled. */
    struct interface *olsrIntf;
  
    /* IP address of this network interface */
    union olsr_ip_addr intAddr;
  
    /* Broadcast address of this network interface */
    union olsr_ip_addr broadAddr;
  
  #define FRAGMENT_HISTORY_SIZE 10
    struct TFragmentHistory {
      u_int16_t ipId;
      u_int8_t ipProto;
      struct in_addr ipSrc;
      struct in_addr ipDst;
    } fragmentHistory[FRAGMENT_HISTORY_SIZE];
  
    int nextFragmentHistoryEntry;
  
    /* Number of received and transmitted BMF packets on this interface */
    u_int32_t nBmfPacketsRx;
    u_int32_t nBmfPacketsRxDup;
    u_int32_t nBmfPacketsTx;
  
    /* Next element in list */
    struct TBmfInterface *next;
  };
  
  extern struct TBmfInterface *BmfInterfaces;
  
  extern int HighestSkfd;
  extern fd_set InputSet;
  
  extern int EtherTunTapFd;
  
  extern char EtherTunTapIfName[];
  
  /* 10.255.255.253 in host byte order */
  #define ETHERTUNTAPDEFAULTIP 0x0AFFFFFD
  
  extern u_int32_t EtherTunTapIp;
  extern u_int32_t EtherTunTapIpMask;
  extern u_int32_t EtherTunTapIpBroadcast;
  
  extern int CapturePacketsOnOlsrInterfaces;
  
  enum TBmfMechanism { BM_BROADCAST = 0, BM_UNICAST_PROMISCUOUS };
  extern enum TBmfMechanism BmfMechanism;
  
  int SetBmfInterfaceName(const char *ifname, void *data, set_plugin_parameter_addon addon);
  int SetBmfInterfaceIp(const char *ip, void *data, set_plugin_parameter_addon addon);
  int SetCapturePacketsOnOlsrInterfaces(const char *enable, void *data, set_plugin_parameter_addon addon);
  int SetBmfMechanism(const char *mechanism, void *data, set_plugin_parameter_addon addon);
  int DeactivateSpoofFilter(void);
  void RestoreSpoofFilter(void);
  
  #define MAX_UNICAST_NEIGHBORS 10
  struct TBestNeighbors {
    struct link_entry *links[MAX_UNICAST_NEIGHBORS];
  };
  
  void FindNeighbors(struct TBestNeighbors *neighbors, struct link_entry **bestNeighbor, struct TBmfInterface *intf,
                     union olsr_ip_addr *source, union olsr_ip_addr *forwardedBy, union olsr_ip_addr *forwardedTo,
                     int *nPossibleNeighbors);
  
  int CreateBmfNetworkInterfaces(struct interface *skipThisIntf);
  void AddInterface(struct interface *newIntf);
  void CloseBmfNetworkInterfaces(void);
  int AddNonOlsrBmfIf(const char *ifName, void *data, set_plugin_parameter_addon addon);
  int IsNonOlsrBmfIf(const char *ifName);
  void CheckAndUpdateLocalBroadcast(unsigned char *ipPacket, union olsr_ip_addr *broadAddr);
  void AddMulticastRoute(void);
  void DeleteMulticastRoute(void);
  
  #endif /* _BMF_NETWORKINTERFACES_H */
  
  /*
   * Local Variables:
   * c-basic-offset: 2
   * indent-tabs-mode: nil
   * End:
   */
  