ip.h

实用的程序代码

/*
 * IP Header File
 */


#ifndef _IP_H
#define _IP_H


// ip header structure
struct xilnet_ip_hdr {
  unsigned char version:4,
                hdr_len:4;
  unsigned char	tos;
  unsigned short total_len;
  unsigned short ident;
  unsigned short frag_off;
  unsigned char	ttl;
  unsigned char	prot;
  unsigned short check_sum;
  unsigned int	src_ip;
  unsigned int	dst_ip;
};

#define IP_VERSION         4       /* 4 for IPV4 */
#define IP_HDR_LEN         5       /* no. of 32-bit words in header */
#define IP_TOS             0x00    /* 0x00 is the tos val for tftp */
#define IP_TOTAL_LEN       0x0220  /* 544 bytes is the max length of ip datagram for TFTP */
#define IP_IDENT           0x006F  /* 111 is the value for no fragmentation */
#define IP_FRAG_OFF        0x0000  /* No fragmentation - 0x0000 */
#define IP_TTL             0x20    /* 32 hops */

#define IP_DADDR_BASE 16
#define IP_SADDR_BASE 12

 
#endif	/* _SYS_IP_H */