/* -*- c++ -*- net-if.h $Id: net-if.h,v 1.6 1998/08/11 15:00:44 dmaltz Exp $ the super class of all network interfaces ====================================================================== Network Interface The hardware that actually transmitts the packet onto the channel with a certain power, modulation scheme, varing amounts of FEC, etc. No packets are "buffered" at this layer as the decision to send has already been made and the packet is on its way to the "Channel". This interface "stamps" each packet with its properties so that they will be "known" at the receiver. This allows the receiver to compute the receive power level, etc. */ #ifndef __net_if_h__ #define __net_if_h__ #include #include class NetIf; LIST_HEAD(if_head, NetIf); #include class NetIf : public NsObject { public: NetIf(); void recv(Packet *p, Handler *h); virtual void xmitPacket(Packet *p) = 0; // send packet out to channel virtual int recvPacket(Packet *p, double *RxPr) = 0; // determine if pkt can be recvd. // rtns 1 if yes, 0 otherwise // *RxPr set to power of incoming packet virtual double txtime(Packet *p) const; virtual double bittime() const { return 1/Rb; } MobileNode* node(void) const { return node_; } virtual void dump(void) const; // each network interface is on two lists NetIf* nextnode(void) const { return node_link.le_next; } NetIf* nextchnl(void) const { return chnl_link.le_next; } inline void insertnode(MobileNode* node, struct if_head* head) { LIST_INSERT_HEAD(head, this, node_link); node_ = node; } inline void insertchnl(Channel *chnl, struct if_head *head) { LIST_INSERT_HEAD(head, this, chnl_link); channel_ = chnl; } protected: void drop(Packet *p); int command(int argc, const char*const* argv); int index; MobileNode *node_; // Node using this interface /* ============================================================ Physical Layer State ============================================================ */ Propagation *propagation_; // Propagation Model Modulation *modulation; // Modulation Scheme double Rb; // bit rate NsObject *recvtarget_; // usually mac layer Channel *channel_; // the channel for output private: inline int initialized() { return (node_ && recvtarget_ && channel_ && propagation_); } /* * A list of all "network interfaces" on a given channel. * Note: a node may have multiple interfaces, each of which * is on a different channel. */ LIST_ENTRY(NetIf) chnl_link; /* * A list of all "network interfaces" for a given mobile node. * Each interface is assoicated with exactly one mobile node * and one channel. */ LIST_ENTRY(NetIf) node_link; }; #endif /* __net_if_h__ */
