K 10
svn:author
V 6
tuexen
K 8
svn:date
V 27
2020-06-03T13:51:53.572357Z
K 7
svn:log
V 503
Restrict enabling TCP-FASTOPEN to end-points in CLOSED or LISTEN state

Enabling TCP-FASTOPEN on an end-point which is in a state other than
CLOSED or LISTEN, is a bug in the application. So it should not work.
Also the TCP code does not (and needs not to) handle this.
While there, also simplify the setting of the TF_FASTOPEN flag.

This issue was found by running syzkaller.

Reviewed by:		rrs
MFC after:		1 week
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D25115

END