[Bug 217637] One TCP connection accepted TWO times

Thu Apr 20 19:20:34 UTC 2017

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217637

--- Comment #81 from commit-hook at freebsd.org ---
A commit references this bug:

Author: tuexen
Date: Thu Apr 20 19:19:34 UTC 2017
New revision: 317208
URL: https://svnweb.freebsd.org/changeset/base/317208

Log:
  Syncoockies can be used in combination with the syncache. If the cache
  overflows, syncookies are used.
  This patch restricts the usage of syncookies in this case: accept
  syncookies only if there was an overflow of the syncache recently.
  This mitigates a problem reported in PR217637, where is syncookie was
  accepted without any recent drops.
  Thanks to glebius@ for suggesting an improvement.

  PR:                   217637
  Reviewed by:          gnn, glebius
  MFC after:            1 week
  Sponsored by:         Netflix, Inc.
  Differential Revision:        https://reviews.freebsd.org/D10272

Changes:
  head/sys/netinet/tcp_syncache.c
  head/sys/netinet/tcp_syncache.h

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