xorheader_bak

COPE the first practical network coding scheme which is developped on click

#ifndef CLICK_XORHEADERN_HH
#define CLICK_XORHEADERN_HH

#include <clicknet/ip.h>
#include <clicknet/tcp.h>

CLICK_SIZE_PACKED_STRUCTURE(
struct click_xorn_header {,

  uint8_t _nentries;
  uint16_t _cksum;
  
  // One unit of the xor header
  uint16_t _ether_type;
  uint16_t _nseq; // neighbor sequence no from sr header
  uint16_t _ipid; // IP ID
  uint32_t _src; // src IP (along with IP ID, uniquely identifies pkt)
  uint8_t _ipttl; // IP TTL of the packet you coded
  uint8_t _alias; // destination of the packet
  uint16_t _len;  

  void set_entry(int entry_index, uint16_t ether_type, uint16_t ipid, uint32_t src, uint8_t alias, uint16_t len) {
    uint8_t *ndx = (uint8_t *) (this+1);
    ndx += (entry_index - 1) * 11;
    uint16_t *etype_t = (uint16_t*)ndx;
    etype_t[0] = htons(ether_type);
    
    uint16_t *ipid_t = (uint16_t *)(ndx + 2); 
    ipid_t[0] = htons(ipid);
    uint32_t *src_t = (uint32_t *)(ndx + 4);
    src_t[0] = src;
    ndx[8] = alias;
    uint16_t *len_t = (uint16_t *)(ndx + 9);
    len_t[0] = htons(len);
  }

  uint16_t get_entry_ethtype(int entry_index) {
    uint8_t *ndx = (uint8_t *) (this+1);
    ndx += (entry_index - 1) * 11;
    uint16_t *etype_t = (uint16_t*)ndx;
    return ntohs(etype_t[0]);
  }

  uint16_t get_entry_ipid(int entry_index) {
    uint8_t *ndx = (uint8_t *) (this+1);
    ndx += (entry_index - 1) * 11;
    
    uint16_t *ipid_t = (uint16_t *)(ndx + 2); 
    return ntohs(ipid_t[0]);
  }

  uint32_t get_entry_src(int entry_index) {
    uint8_t *ndx = (uint8_t *) (this+1);
    ndx += (entry_index - 1) * 11;

    uint32_t *src_t = (uint32_t *)(ndx + 4);
    return src_t[0];
  }

  uint8_t get_entry_alias(int entry_index) {
    uint8_t *ndx = (uint8_t *) (this+1);
    ndx += (entry_index - 1) * 11;

    return ndx[8];
  }

  uint16_t get_entry_len(int entry_index) {
    uint8_t *ndx = (uint8_t *) (this+1);
    ndx += (entry_index - 1) * 11;
    
    uint16_t *len_t = (uint16_t *)(ndx + 9); 
    return ntohs(len_t[0]);
  }
 

  void set_nentries(int n) {
    _nentries = n;
  }


  static size_t get_hlen(int nentries) {
    return sizeof(struct click_xorn_header) + sizeof(uint16_t) * nentries + sizeof(uint16_t) * nentries + sizeof(uint32_t) * nentries + sizeof(uint8_t) * nentries + sizeof(uint16_t) * nentries - 11;
  }

  size_t nentries() {
    return _nentries;
  }

  void set_checksum() {
    unsigned int max_len = 0;
    for (unsigned int i = 0; i < nentries(); i++) {
      if (get_entry_len(i) > max_len) max_len = get_entry_len(i);
    }
    max_len += sizeof(struct click_xorn_header);
    _cksum = 0;
    _cksum = click_in_cksum((unsigned char *)this, max_len);
  }
});
    


#endif