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

   1 /******************************************************************************
   2 Author: Samuel Jero
   3
   4 Date: 7/2011
   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 packet *new:          The New packet. It contains the following fields.
  15  *
  16  *      struct pcap_pkthdr *h: This is a copy of the libpcap packet structure.
  17  *                                                         You are free to modify and use the fields.
  18  *
  19  *      u_char *data:           This is a pointer to a buffer for the new packet.
  20  *                                                      Each encapsulation has the responsibility to call
  21  *                                                      When a function is called, this will point at the
  22  *                                                      location for that protocol's header to start.
  23  *
  24  *      int length:                     The length of the new packet. Each encapsulation
  25  *                                              can rely on this to contain the remaining buffer
  26  *                                              space AND must return with this parameter containing
  27  *                                              the length of the new packet at that layer.
  28  *
  29  *      uint32_t src_id:        This is an ID for the source host. If you are going to
  30  *                                              demultiplex DCCP on anything but Port Numbers, you
  31  *                                              need to set this field. Typically this would be an
  32  *                                              IP address.
  33  *
  34  *      uint32_t dest_id:       This is an ID for the destination host. If you are going to
  35  *                                              demultiplex DCCP on anything but Port Numbers, you
  36  *                                              need to set this field. Typically this would be an
  37  *                                              IP address.
  38  *
  39  *      struct const_packet *old:       The Old packet. It contains the following fields.
  40  *
  41  *      u_char* data:           This is a pointer to the buffer containing the
  42  *                                              old packet. When a function is called, this will
  43  *                                              point at the location of that protocol's header.
  44  *
  45  *      int length:                     The length of the old packet. Each encapsulation
  46  *                                              layer MUST decrement this by the amount of it's
  47  *                                              headers. An encapsulation layer MUST never read
  48  *                                              beyond this into old->data.
  49  */
  50
  51 /*
  52  * Last Level Conversion Function
  53  * Converts DCCP to TCP for analysis by TCPTRACE
  54  */
  55 int convert_packet(struct packet *new, const struct const_packet *old);
  56
  57 /*Standard Encapsulation Functions*/
  58 int ethernet_encap(struct packet *new, const struct const_packet *old);
  59 int linux_cooked_encap(struct packet *new, const struct const_packet *old);
  60 int ipv4_encap(struct packet *new, const struct const_packet *old);
  61
  62 #endif /* ENCAP_H_ */