tuexen 5d8f9a3242 When the RACK stack computes the space for user data in a TCP segment,
it wasn't taking the IP level options into account. This patch fixes this.
In addition, it also corrects a KASSERT and adds protection code to assure
that the IP header chain and the TCP head fit in the first fragment as
required by RFC 7112.

Reviewed by:		rrs@
MFC after:		3 days
Sponsored by:		Nertflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D21666
2019-09-19 10:27:47 +00:00
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