I want to add an extra field in the Hdr_cmn structure (in packet.h). Lets
just say the extra field is : MyValue.
- At the routing layer, I modified the value of this field.
- At the Physical layer (wireless-phy.cc), I take some actions based on the
value of MyValue.
To my surprise, even though I set this value in the routing layer as 1, at
the physical layer, when I read it, its always 0.
I can't understand why.
Besides adding this field in the cmn_hdr structure, do I need to do
anything else ? (I didn't add the inline functions etc.)
I attached a part of the packet.h file. The only modification I made is
between the ********** lines.
Thanks a lot for your help.
============================================
struct hdr_cmn {
enum dir_t { DOWN= -1, NONE= 0, UP= 1 };
packet_t ptype_; // packet type (see above)
int size_; // simulated packet size
int uid_; // unique id
int error_; // error flag
int errbitcnt_; // # of corrupted bits jahn
int fecsize_;
double ts_; // timestamp: for q-delay measurement
int iface_; // receiving interface (label)
dir_t direction_; // direction: 0=none, 1=up, -1=down
// source routing
char src_rt_valid;
double ts_arr_; // Required by Marker of JOBS
//Monarch extn begins
nsaddr_t prev_hop_; // IP addr of forwarding hop
nsaddr_t next_hop_; // next hop for this packet
int addr_type_; // type of next_hop_ addr
nsaddr_t last_hop_; // for tracing on multi-user channels
// called if pkt can't obtain media or isn't ack'd. not called if
// droped by a queue
FailureCallback xmit_failure_;
void *xmit_failure_data_;
/*
* MONARCH wants to know if the MAC layer is passing this back because
* it could not get the RTS through or because it did not receive
* an ACK.
*/
int xmit_reason_;
#define XMIT_REASON_RTS 0x01
#define XMIT_REASON_ACK 0x02
// filled in by GOD on first transmission, used for trace analysis
int num_forwards_; // how many times this pkt was forwarded
int opt_num_forwards_; // optimal #forwards
// Monarch extn ends;
// tx time for this packet in sec
double txtime_;
inline double& txtime() { return(txtime_); }
// ****************************** MODIFICATION BEGINS HERE
***********************
u_int8_t MyValue;
// ****************************** MODIFICATION ENDS HERE
*************************
static int offset_; // offset for this header
inline static int& offset() { return offset_; }
inline static hdr_cmn* access(const Packet* p) {
return (hdr_cmn*) p->access(offset_);
}
/* per-field member functions */
inline packet_t& ptype() { return (ptype_); }
inline int& size() { return (size_); }
inline int& uid() { return (uid_); }
inline int& error() { return error_; }
inline int& errbitcnt() {return errbitcnt_; }
inline int& fecsize() {return fecsize_; }
inline double& timestamp() { return (ts_); }
inline int& iface() { return (iface_); }
inline dir_t& direction() { return (direction_); }
// monarch_begin
inline nsaddr_t& next_hop() { return (next_hop_); }
inline int& addr_type() { return (addr_type_); }
inline int& num_forwards() { return (num_forwards_); }
inline int& opt_num_forwards() { return (opt_num_forwards_); }
//monarch_end
};
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