| #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 */ |