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Explicitly check for TCP_MSS to be <= ~16 kByte

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See bug #54890

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>
This commit is contained in:
Simon Goldschmidt 2018-10-26 19:43:13 +02:00
parent a41c1fcc62
commit a352f4e11c
1 changed files with 3 additions and 0 deletions
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3
src/core/init.c
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@ -305,6 +305,9 @@ PACK_STRUCT_END
#if TCP_SNDLOWAT >= TCP_SND_BUF
#error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must be less than TCP_SND_BUF. If you know what you are doing, define LWIP_DISABLE_TCP_SANITY_CHECKS to 1 to disable this error."
#endif
#if TCP_MSS >= ((16 * 1024) - 1)
#error "lwip_sanity_check: WARNING: TCP_MSS must be <= 16382 to prevent u16_t underflow in TCP_SNDLOWAT calculation!"
#endif
#if TCP_SNDLOWAT >= (0xFFFF - (4 * TCP_MSS))
#error "lwip_sanity_check: WARNING: TCP_SNDLOWAT must at least be 4*MSS below u16_t overflow!"
#endif