[lwip-devel] [bug #26251] RST process in TIME_WAIT TCP state

[Oleg Tyshev]

URL:
  <http://savannah.nongnu.org/bugs/?26251>

                 Summary: RST process in TIME_WAIT TCP state
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: olegreen
            Submitted on: Mon 20 Apr 2009 11:16:04 AM GMT
                Category: TCP
                Severity: 3 - Normal
              Item Group: Change Request
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head

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Details:

Last week I saw RFC 1337 "TIME-WAIT Assassination Hazards in TCP".
As a simplest fix for TWA hazard in capital 4 was suggested following:

(F1) Ignore RST segments in TIME-WAIT state.

If the 2 minute MSL is enforced, this fix avoids all three hazards.

This is the simplest fix.  One could also argue that it is formally the
correct thing to do; since allowing time for old duplicate segments to die is
one of TIME-WAIT state's functions, the state should not be truncated by a RST
segment.

May be we can filter RST segments in TIME-WAIT state (function
tcp_process())?




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