| 1 |
#ifndef VJBSDHDR_H |
|---|
| 2 |
#define VJBSDHDR_H |
|---|
| 3 |
|
|---|
| 4 |
#include "lwip/tcp.h" |
|---|
| 5 |
|
|---|
| 6 |
|
|---|
| 7 |
/* |
|---|
| 8 |
* Structure of an internet header, naked of options. |
|---|
| 9 |
* |
|---|
| 10 |
* We declare ip_len and ip_off to be short, rather than u_short |
|---|
| 11 |
* pragmatically since otherwise unsigned comparisons can result |
|---|
| 12 |
* against negative integers quite easily, and fail in subtle ways. |
|---|
| 13 |
*/ |
|---|
| 14 |
PACK_STRUCT_BEGIN |
|---|
| 15 |
struct ip |
|---|
| 16 |
{ |
|---|
| 17 |
#if defined(NO_CHAR_BITFIELDS) |
|---|
| 18 |
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... */ |
|---|
| 19 |
#else |
|---|
| 20 |
#if BYTE_ORDER == LITTLE_ENDIAN |
|---|
| 21 |
unsigned ip_hl:4, /* header length */ |
|---|
| 22 |
ip_v:4; /* version */ |
|---|
| 23 |
#elif BYTE_ORDER == BIG_ENDIAN |
|---|
| 24 |
unsigned ip_v:4, /* version */ |
|---|
| 25 |
ip_hl:4; /* header length */ |
|---|
| 26 |
#else |
|---|
| 27 |
COMPLAIN - NO BYTE ORDER SELECTED! |
|---|
| 28 |
#endif |
|---|
| 29 |
#endif |
|---|
| 30 |
u_char ip_tos; /* type of service */ |
|---|
| 31 |
u_short ip_len; /* total length */ |
|---|
| 32 |
u_short ip_id; /* identification */ |
|---|
| 33 |
u_short ip_off; /* fragment offset field */ |
|---|
| 34 |
#define IP_DF 0x4000 /* dont fragment flag */ |
|---|
| 35 |
#define IP_MF 0x2000 /* more fragments flag */ |
|---|
| 36 |
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ |
|---|
| 37 |
u_char ip_ttl; /* time to live */ |
|---|
| 38 |
u_char ip_p; /* protocol */ |
|---|
| 39 |
u_short ip_sum; /* checksum */ |
|---|
| 40 |
struct in_addr ip_src,ip_dst; /* source and dest address */ |
|---|
| 41 |
}; |
|---|
| 42 |
PACK_STRUCT_END |
|---|
| 43 |
|
|---|
| 44 |
typedef u32_t tcp_seq; |
|---|
| 45 |
|
|---|
| 46 |
/* |
|---|
| 47 |
* TCP header. |
|---|
| 48 |
* Per RFC 793, September, 1981. |
|---|
| 49 |
*/ |
|---|
| 50 |
PACK_STRUCT_BEGIN |
|---|
| 51 |
struct tcphdr |
|---|
| 52 |
{ |
|---|
| 53 |
u_short th_sport; /* source port */ |
|---|
| 54 |
u_short th_dport; /* destination port */ |
|---|
| 55 |
tcp_seq th_seq; /* sequence number */ |
|---|
| 56 |
tcp_seq th_ack; /* acknowledgement number */ |
|---|
| 57 |
#if defined(NO_CHAR_BITFIELDS) |
|---|
| 58 |
u_char th_x2_off; |
|---|
| 59 |
#else |
|---|
| 60 |
#if BYTE_ORDER == LITTLE_ENDIAN |
|---|
| 61 |
unsigned th_x2:4, /* (unused) */ |
|---|
| 62 |
th_off:4; /* data offset */ |
|---|
| 63 |
#endif |
|---|
| 64 |
#if BYTE_ORDER == BIG_ENDIAN |
|---|
| 65 |
unsigned th_off:4, /* data offset */ |
|---|
| 66 |
th_x2:4; /* (unused) */ |
|---|
| 67 |
#endif |
|---|
| 68 |
#endif |
|---|
| 69 |
u_char th_flags; |
|---|
| 70 |
u_short th_win; /* window */ |
|---|
| 71 |
u_short th_sum; /* checksum */ |
|---|
| 72 |
u_short th_urp; /* urgent pointer */ |
|---|
| 73 |
}; |
|---|
| 74 |
PACK_STRUCT_END |
|---|
| 75 |
|
|---|
| 76 |
#endif /* VJBSDHDR_H */ |
|---|
