| Travis Geiselbrecht | 1d0df69 | 2008-09-01 02:26:09 -0700 | [diff] [blame^] | 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 */ |