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tcp: add macros to deal with sequence number wraparound

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YAMAMOTO Takashi 2021-06-01 13:48:47 +09:00 • committed by Xiang Xiao
parent bf1d587063
commit 433a2b27d9
1 changed files with 9 additions and 0 deletions
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9
net/tcp/tcp.h
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@ -86,6 +86,15 @@
# endif
#endif
/* 32-bit modular arithmetics for tcp sequence numbers */
#define TCP_SEQ_LT(a, b) ((int32_t)((a) - (b)) < 0)
#define TCP_SEQ_GT(a, b) TCP_SEQ_LT(b, a)
#define TCP_SEQ_LTE(a, b) (!TCP_SEQ_GT(a, b))
#define TCP_SEQ_GTE(a, b) (!TCP_SEQ_LT(a, b))
#define TCP_SEQ_SUB(a, b) ((uint32_t)((a) - (b)))
/****************************************************************************
* Public Type Definitions
****************************************************************************/