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tcp: add a define for maximum option bytes

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goldsimon
2018-01-31 21:55:23 +01:00
parent 2c3c578475
commit 9fb86f6e4b
2 changed files with 3 additions and 1 deletions
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2
src/include/lwip/prot/tcp.h
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@@ -80,6 +80,8 @@ PACK_STRUCT_END
/* Valid TCP header flags */
#define TCP_FLAGS 0x3fU
#define TCP_MAX_OPTION_BYTES 40
#define TCPH_HDRLEN(phdr) ((u16_t)(lwip_ntohs((phdr)->_hdrlen_rsvd_flags) >> 12))
#define TCPH_HDRLEN_BYTES(phdr) ((u8_t)(TCPH_HDRLEN(phdr) << 2))
#define TCPH_FLAGS(phdr) ((u8_t)((lwip_ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS)))