sjero.net Git - dccp2tcp/blob - encap.h

   1 /******************************************************************************
   2 Author: Samuel Jero
   3
   4 Date: 5/2011
   5
   6 Description: Header file for Encapsulation Functions for DCCP to TCP conversion
   7
   8 ******************************************************************************/
   9 #ifndef ENCAP_H_
  10 #define ENCAP_H_
  11
  12 /*
  13  * All Conversion functions use these standard arguments:
  14  *  struct pcap_pkthdr *h: This is a copy of the libpcap packet structure.
  15  *                                                 You are free to modify and use the fields.
  16  *
  17  *  u_char **nptr:              This is a pointer to a buffer for the new packet.
  18  *                                              Each encapsulation has the responsibility to call
  19  *                                              When a function is called, this will point at the
  20  *                                              location for that protocol's header to start.
  21  *
  22  *  int *nlength:               The length of the new packet. Each encapsulation
  23  *                                      can rely on this to contain the remaining buffer
  24  *                                      space AND must return with this parameter containing
  25  *                                      the length of the new packet at that layer.
  26  *
  27  *  u_char** optr:              This is a pointer to the buffer containing the
  28  *                                      old packet. When a functio is called, this will
  29  *                                      point at the location of that protocol's header.
  30  *
  31  *  int* length:                The length of the old packet. Each encapsulation
  32  *                                      layer MUST decrement this by the amount of it's
  33  *                                      headers. An encapsulation layer MUST never read
  34  *                                      beyond this into optr.
  35  */
  36
  37 /*
  38  * Last Level Conversion Function
  39  * Converts DCCP to TCP for analysis by TCPTRACE
  40  */
  41 int convert_packet(struct pcap_pkthdr *h, u_char **nptr, int *nlength, const u_char **optr, int *length);
  42
  43 /*Standard Encapsulation Functions*/
  44 int ethernet_encap(struct pcap_pkthdr *h, u_char **nptr, int *nlength, const u_char **optr, int *length);
  45 int linux_cooked_encap(struct pcap_pkthdr *h, u_char **nptr, int *nlength, const u_char **optr, int *length);
  46 int ipv4_encap(struct pcap_pkthdr *h, u_char **nptr, int *nlength, const u_char **optr, int *length);
  47
  48 #endif /* ENCAP_H_ */