K 10
svn:author
V 6
tuexen
K 8
svn:date
V 27
2019-09-29T10:45:13.606061Z
K 7
svn:log
V 485
RFC 7112 requires a host to put the complete IP header chain
including the TCP header in the first IP packet.
Enforce this in tcp_output(). In addition make sure that at least
one byte payload fits in the TCP segement to allow making progress.
Without this check, a kernel with INVARIANTS will panic.
This issue was found by running an instance of syzkaller.

Reviewed by:		jtl@
MFC after:		3 days
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D21665

END