zicmp.h

uCOSII上实现的tcpip协议实现代码（gcc编译）

#ifndef _ZICMP_H
#define _ZICMP_H

#include "zarch.h"
#include "zdef.h"
#include "zbuffer.h"
#include "znetif.h"
#include "zeth.h"
#include "zipv4.h"




#define ICMP_ER 0      /* echo reply */
#define ICMP_DUR 3     /* destination unreachable */
#define ICMP_SQ 4      /* source quench */
#define ICMP_RD 5      /* redirect */
#define ICMP_ECHO 8    /* echo */
#define ICMP_TE 11     /* time exceeded */
#define ICMP_PP 12     /* parameter problem */
#define ICMP_TS 13     /* timestamp */
#define ICMP_TSR 14    /* timestamp reply */
#define ICMP_IRQ 15    /* information request */
#define ICMP_IR 16     /* information reply */


enum icmp_dur_type {
	ICMP_DUR_NET = 0,    /* net unreachable */
	ICMP_DUR_HOST = 1,   /* host unreachable */
	ICMP_DUR_PROTO = 2,  /* protocol unreachable */
	ICMP_DUR_PORT = 3,   /* port unreachable */
	ICMP_DUR_FRAG = 4,   /* fragmentation needed and DF set */
	ICMP_DUR_SR = 5      /* source route failed */
};
enum icmp_te_type {
	ICMP_TE_TTL = 0,     /* time to live exceeded in transit */
	ICMP_TE_FRAG = 1     /* fragment reassembly time exceeded */
};


STRUCT_BEGIN
typedef struct _icmp_echo_header
{
	u16_t _type_code;
	u16_t chksum;
	u16_t id;
	u16_t seqno;
}icmp_echo_header_t;

typedef struct _icmp_dur_header
{
	u16_t _type_code;
	u16_t chksum;
	u32_t unused;
	
}icmp_dur_header_t;


typedef struct _icmp_te_header
{
	u16_t _type_code;
	u16_t chksum;
	u32_t unused;
}icmp_te_header_t;
STRUCT_END

extern int icmp_input(znetif_t *pnetif, zbuffer_t *pbuffer);
extern void icmp_dest_unreach(znetif_t *pnetif, zbuffer_t *pbuffer, enum icmp_dur_type t);


#define ICMPH_TYPE(hdr) (NTOHS((hdr)->_type_code) >> 8)
#define ICMPH_CODE(hdr) (NTOHS((hdr)->_type_code) & 0xff)

#define ICMPH_TYPE_SET(hdr, type) ((hdr)->_type_code = HTONS(ICMPH_CODE(hdr) | ((type) << 8)))
#define ICMPH_CODE_SET(hdr, code) ((hdr)->_type_code = HTONS((code) | (ICMPH_TYPE(hdr) << 8)))


#endif