| Log Message: |
MFC r317208:
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
Differential Revision: https://reviews.freebsd.org/D10272
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stable/10/
stable/10/sys/netinet/tcp_syncache.c