packet_ops.h

Adhoc无线网络路由协议源码

#ifndef PACKET_OPS_H
#define PACKET_OPS_H

#include "queue.h"
#include "hashtab.h"
#include "api.h"
#include <sys/types.h>

/* initializes the packet_table */
int
packet_table_init();

/* this function destroys the packet_table and frees all memory
*  associated with it */
int
destroy_packet_table(void);


/* add a packet to the packet_table 
* buf is a complete IP packet
* return 0 on success */
int
packet_add(unsigned char *buf, unsigned int len);


/* sends out all the packets for a given destination
* on the raw socket.
* and frees the corresponding memory, if result==SUCCESS.
* 
* if result==ASL_NO_ROUTE then the packets are just deleted from the packet_table
* if result==ASL_ROUTE_FOUND then the packets are sent on the raw sock
*
* returns 0 if succesful. */
int
clear_packets(addr_t dest_ip, int result);


/* Given a queue, send out all the queued packets on the raw socket
* if result == NO_ROUTE then just delete those packets */
int
send_all(struct queue *q, int result);


/* returns 1 if route disocvery is pending for that destination.
* If an entry exists in the hash table, we conclude that route disocvery
*  is pending */
int
route_discovery_pending(unsigned char *dest);

/* copy the dest_ip address from an IP packet to an array and return it */
unsigned char *
get_dest_ip(unsigned char *buf);

/* copy the src_ip address from an IP packet to an array and return it */
unsigned char *
get_src_ip(unsigned char *buf);

/* return the protocol field from the IP packet */
u_int8_t
get_protocol(unsigned char *buf);


#endif