4 #include "lwip/tcp.h"
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8 * Structure of an internet header, naked of options.
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10 * We declare ip_len and ip_off to be short, rather than u_short
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11 * pragmatically since otherwise unsigned comparisons can result
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12 * against negative integers quite easily, and fail in subtle ways.
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17 #if defined(NO_CHAR_BITFIELDS)
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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... */
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20 #if BYTE_ORDER == LITTLE_ENDIAN
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21 unsigned ip_hl:4, /* header length */
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22 ip_v:4; /* version */
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23 #elif BYTE_ORDER == BIG_ENDIAN
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24 unsigned ip_v:4, /* version */
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25 ip_hl:4; /* header length */
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27 COMPLAIN - NO BYTE ORDER SELECTED!
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30 u_char ip_tos; /* type of service */
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31 u_short ip_len; /* total length */
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32 u_short ip_id; /* identification */
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33 u_short ip_off; /* fragment offset field */
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34 #define IP_DF 0x4000 /* dont fragment flag */
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35 #define IP_MF 0x2000 /* more fragments flag */
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36 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
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37 u_char ip_ttl; /* time to live */
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38 u_char ip_p; /* protocol */
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39 u_short ip_sum; /* checksum */
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40 struct in_addr ip_src,ip_dst; /* source and dest address */
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44 typedef u32_t tcp_seq;
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48 * Per RFC 793, September, 1981.
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53 u_short th_sport; /* source port */
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54 u_short th_dport; /* destination port */
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55 tcp_seq th_seq; /* sequence number */
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56 tcp_seq th_ack; /* acknowledgement number */
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57 #if defined(NO_CHAR_BITFIELDS)
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60 #if BYTE_ORDER == LITTLE_ENDIAN
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61 unsigned th_x2:4, /* (unused) */
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62 th_off:4; /* data offset */
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64 #if BYTE_ORDER == BIG_ENDIAN
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65 unsigned th_off:4, /* data offset */
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66 th_x2:4; /* (unused) */
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70 u_short th_win; /* window */
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71 u_short th_sum; /* checksum */
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72 u_short th_urp; /* urgent pointer */
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76 #endif /* VJBSDHDR_H */
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