#ifndef VJBSDHDR_H | |
#define VJBSDHDR_H | |
#include "lwip/tcp.h" | |
/* | |
* Structure of an internet header, naked of options. | |
* | |
* We declare ip_len and ip_off to be short, rather than u_short | |
* pragmatically since otherwise unsigned comparisons can result | |
* against negative integers quite easily, and fail in subtle ways. | |
*/ | |
PACK_STRUCT_BEGIN | |
struct ip | |
{ | |
#if defined(NO_CHAR_BITFIELDS) | |
u_char ip_hl_v; /* bug in GCC for mips means the bitfield stuff will sometimes break - so we use a char for both and get round it with macro's instead... */ | |
#else | |
#if BYTE_ORDER == LITTLE_ENDIAN | |
unsigned ip_hl:4, /* header length */ | |
ip_v:4; /* version */ | |
#elif BYTE_ORDER == BIG_ENDIAN | |
unsigned ip_v:4, /* version */ | |
ip_hl:4; /* header length */ | |
#else | |
COMPLAIN - NO BYTE ORDER SELECTED! | |
#endif | |
#endif | |
u_char ip_tos; /* type of service */ | |
u_short ip_len; /* total length */ | |
u_short ip_id; /* identification */ | |
u_short ip_off; /* fragment offset field */ | |
#define IP_DF 0x4000 /* dont fragment flag */ | |
#define IP_MF 0x2000 /* more fragments flag */ | |
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ | |
u_char ip_ttl; /* time to live */ | |
u_char ip_p; /* protocol */ | |
u_short ip_sum; /* checksum */ | |
struct in_addr ip_src,ip_dst; /* source and dest address */ | |
}; | |
PACK_STRUCT_END | |
typedef u32_t tcp_seq; | |
/* | |
* TCP header. | |
* Per RFC 793, September, 1981. | |
*/ | |
PACK_STRUCT_BEGIN | |
struct tcphdr | |
{ | |
u_short th_sport; /* source port */ | |
u_short th_dport; /* destination port */ | |
tcp_seq th_seq; /* sequence number */ | |
tcp_seq th_ack; /* acknowledgement number */ | |
#if defined(NO_CHAR_BITFIELDS) | |
u_char th_x2_off; | |
#else | |
#if BYTE_ORDER == LITTLE_ENDIAN | |
unsigned th_x2:4, /* (unused) */ | |
th_off:4; /* data offset */ | |
#endif | |
#if BYTE_ORDER == BIG_ENDIAN | |
unsigned th_off:4, /* data offset */ | |
th_x2:4; /* (unused) */ | |
#endif | |
#endif | |
u_char th_flags; | |
u_short th_win; /* window */ | |
u_short th_sum; /* checksum */ | |
u_short th_urp; /* urgent pointer */ | |
}; | |
PACK_STRUCT_END | |
#endif /* VJBSDHDR_H */ |