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tcp: add comments about usage of options

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goldsimon 2018-01-30 22:01:54 +01:00
parent 424c33bcb7
commit 0ee7a39594
1 changed files with 3 additions and 3 deletions
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6
src/include/lwip/priv/tcp_priv.h
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@ -261,12 +261,12 @@ struct tcp_seg {
u8_t chksum_swapped; u8_t chksum_swapped;
#endif /* TCP_CHECKSUM_ON_COPY */ #endif /* TCP_CHECKSUM_ON_COPY */
u8_t flags; u8_t flags;
#define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option. */ #define TF_SEG_OPTS_MSS (u8_t)0x01U /* Include MSS option (only used in SYN segments) */
#define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */ #define TF_SEG_OPTS_TS (u8_t)0x02U /* Include timestamp option. */
#define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is #define TF_SEG_DATA_CHECKSUMMED (u8_t)0x04U /* ALL data (not the header) is
checksummed into 'chksum' */ checksummed into 'chksum' */
#define TF_SEG_OPTS_WND_SCALE (u8_t)0x08U /* Include WND SCALE option */ #define TF_SEG_OPTS_WND_SCALE (u8_t)0x08U /* Include WND SCALE option (only used in SYN segments) */
#define TF_SEG_OPTS_SACK_PERM (u8_t)0x10U /* Include SACK Permitted option */ #define TF_SEG_OPTS_SACK_PERM (u8_t)0x10U /* Include SACK Permitted option (only used in SYN segments) */
struct tcp_hdr *tcphdr; /* the TCP header */ struct tcp_hdr *tcphdr; /* the TCP header */
}; };