git.joshuawise.com / netwatch.git / blame
| Commit | Line | Data |
|---|---|---|
| 6e6d4a8b JP |
1 | #ifndef VJBSDHDR_H |
| 2 | #define VJBSDHDR_H | |
| 3 | ||
| 4 | #include "lwip/tcp.h" | |
| 5 | ||
| 6 | /* | |
| 7 | * Structure of an internet header, naked of options. | |
| 8 | * | |
| 9 | * We declare ip_len and ip_off to be short, rather than u_short | |
| 10 | * pragmatically since otherwise unsigned comparisons can result | |
| 11 | * against negative integers quite easily, and fail in subtle ways. | |
| 12 | */ | |
| 13 | PACK_STRUCT_BEGIN | |
| 14 | struct ip | |
| 15 | { | |
| 16 | #if defined(NO_CHAR_BITFIELDS) | |
| 17 | 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... */ | |
| 18 | #else | |
| 19 | #if BYTE_ORDER == LITTLE_ENDIAN | |
| 20 | unsigned ip_hl:4, /* header length */ | |
| 21 | ip_v :4; /* version */ | |
| 22 | #elif BYTE_ORDER == BIG_ENDIAN | |
| 23 | unsigned ip_v :4, /* version */ | |
| 24 | ip_hl:4; /* header length */ | |
| 25 | #else | |
| 26 | COMPLAIN - NO BYTE ORDER SELECTED! | |
| 27 | #endif | |
| 28 | #endif | |
| 29 | u_char ip_tos; /* type of service */ | |
| 30 | u_short ip_len; /* total length */ | |
| 31 | u_short ip_id; /* identification */ | |
| 32 | u_short ip_off; /* fragment offset field */ | |
| 33 | #define IP_DF 0x4000 /* dont fragment flag */ | |
| 34 | #define IP_MF 0x2000 /* more fragments flag */ | |
| 35 | #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ | |
| 36 | u_char ip_ttl; /* time to live */ | |
| 37 | u_char ip_p; /* protocol */ | |
| 38 | u_short ip_sum; /* checksum */ | |
| 39 | struct in_addr ip_src,ip_dst; /* source and dest address */ | |
| 40 | }; | |
| 41 | PACK_STRUCT_END | |
| 42 | ||
| 43 | typedef u32_t tcp_seq; | |
| 44 | ||
| 45 | /* | |
| 46 | * TCP header. | |
| 47 | * Per RFC 793, September, 1981. | |
| 48 | */ | |
| 49 | PACK_STRUCT_BEGIN | |
| 50 | struct tcphdr | |
| 51 | { | |
| 52 | u_short th_sport; /* source port */ | |
| 53 | u_short th_dport; /* destination port */ | |
| 54 | tcp_seq th_seq; /* sequence number */ | |
| 55 | tcp_seq th_ack; /* acknowledgement number */ | |
| 56 | #if defined(NO_CHAR_BITFIELDS) | |
| 57 | u_char th_x2_off; | |
| 58 | #else | |
| 59 | #if BYTE_ORDER == LITTLE_ENDIAN | |
| 60 | unsigned th_x2 :4, /* (unused) */ | |
| 61 | th_off:4; /* data offset */ | |
| 62 | #endif | |
| 63 | #if BYTE_ORDER == BIG_ENDIAN | |
| 64 | unsigned th_off:4, /* data offset */ | |
| 65 | th_x2 :4; /* (unused) */ | |
| 66 | #endif | |
| 67 | #endif | |
| 68 | u_char th_flags; | |
| 69 | u_short th_win; /* window */ | |
| 70 | u_short th_sum; /* checksum */ | |
| 71 | u_short th_urp; /* urgent pointer */ | |
| 72 | }; | |
| 73 | PACK_STRUCT_END | |
| 74 | ||
| 75 | #endif /* VJBSDHDR_H */ |