xorheader.hh

来自「COPE the first practical network coding 」· HH 代码 · 共 33 行

#ifndef CLICK_XORHEADER_HH
#define CLICK_XORHEADER_HH

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

CLICK_SIZE_PACKED_STRUCTURE(
struct click_xor_header {,
  uint16_t _ether_type[2];
  uint16_t _ipid[2]; // IP ID
  uint32_t _src[2] ; // src IP (along with IP ID, uniquely identifies pkt)
  uint8_t _alias[2]; // prev hops
  uint16_t _len[2];  
  uint16_t _cksum;

  // bunch of debug fields for the snooper
  uint32_t _dst[2];
  uint16_t _tcp_sport[2];
  uint16_t _tcp_dport[2];
  tcp_seq_t _tcp_seq[2];
  tcp_seq_t _tcp_ack[2];

  void set_checksum() {
    unsigned int tlen = ((ntohs(_len[1]) > ntohs(_len[0])) ? ntohs(_len[1]) : ntohs(_len[0])) + sizeof(struct click_xor_header);
    _cksum = 0;
    _cksum = click_in_cksum((unsigned char *)this, tlen);
  }
});
    


#endif