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