icmp.h

LWIP1.1.1在UCOS-II2.61上的移植

#ifndef __LWIP_ICMP_H__
#define __LWIP_ICMP_H__

#include "lwip/arch.h"

#include "lwip/opt.h"
#include "lwip/pbuf.h"

#include "lwip/ip_addr.h"
#include "lwip/netif.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 */
};

void icmp_input(struct pbuf *p, struct netif *inp);

void icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t);
void icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t);

#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/bpstruct.h"
#endif
PACK_STRUCT_BEGIN
struct icmp_echo_hdr {
  PACK_STRUCT_FIELD(u16_t _type_code);
  PACK_STRUCT_FIELD(u16_t chksum);
  PACK_STRUCT_FIELD(u16_t id);
  PACK_STRUCT_FIELD(u16_t seqno);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END

PACK_STRUCT_BEGIN
struct icmp_dur_hdr {
  PACK_STRUCT_FIELD(u16_t _type_code);
  PACK_STRUCT_FIELD(u16_t chksum);
  PACK_STRUCT_FIELD(u32_t unused);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END

PACK_STRUCT_BEGIN
struct icmp_te_hdr {
  PACK_STRUCT_FIELD(u16_t _type_code);
  PACK_STRUCT_FIELD(u16_t chksum);
  PACK_STRUCT_FIELD(u32_t unused);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/epstruct.h"
#endif

#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 /* __LWIP_ICMP_H__ */