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tcp: improve behaviour when using TCP_NOOPT

Description

tcp: improve behaviour when using TCP_NOOPT

Use ISS for SEG.SEQ when sending a SYN-ACK segment in response to
an SYN segment received in the SYN-SENT state on a socket having
the IPPROTO_TCP level socket option TCP_NOOPT enabled.

Reviewed by: rscheff
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D28656

Details

Provenance
tuexenAuthored on Feb 14 2021, 11:10 AM
Reviewer
rscheff
Differential Revision
D28656: Fix SEG.SEQ in SYN.ACK when handling SYN in SYN-SENT on socket with TCP_NOOPT enabled.
Parents
rG1bd44b11e59f: Do not reference returned ifa in in6_ifawithifp().
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