[Bug 250499] [tcp] Should we reject the packet with timestamp if no timestamp in SYN and SYN_ACK?

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250499

--- Comment #4 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: tuexen
Date: Mon Nov 30 10:58:07 UTC 2020
New revision: 368183
URL: https://svnweb.freebsd.org/changeset/base/368183

Log:
   MFC r367530:
   RFC 7323 specifies that:
   * TCP segments without timestamps should be dropped when support for
     the timestamp option has been negotiated.
   * TCP segments with timestamps should be processed normally if support
     for the timestamp option has not been negotiated.
   This patch enforces the above.
   Manually resolved merge conflicts.

   MFC 367891:
   Fix an issue I introuced in r367530: tcp_twcheck() can be called
   with to == NULL for SYN segments. So don't assume tp != NULL.
   Thanks to jhb@ for reporting and suggesting a fix.

   MFC r367946:
   Fix two occurences of a typo in a comment introduced in r367530.
   Thanks to lstewart@ for reporting them.

  PR:                   250499
  Reviewed by:          gnn, rrs
  Sponsored by:         Netflix, Inc.
  Differential Revision:        https://reviews.freebsd.org/D27148

Changes:
_U  stable/11/
  stable/11/sys/netinet/tcp_input.c
  stable/11/sys/netinet/tcp_syncache.c
  stable/11/sys/netinet/tcp_timewait.c

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