[lwip-devel] [bug #38315] tcp_eff_send_mss_impl() always subtract the difference in IPv6 header size

[Valery Ushakov]

URL:
  <http://savannah.nongnu.org/bugs/?38315>

                 Summary: tcp_eff_send_mss_impl() always subtract the
difference in IPv6 header size
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: uwe
            Submitted on: Tue 12 Feb 2013 02:57:23 PM 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: git head

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Details:

tcp_eff_send_mss_impl() checks for #if LWIP_IPV6 and then unconditionally
subtracts (IP6_HLEN - IP_HLEN) from mss_s.  It should do that only when
"isipv6" is set, so that IPv4 connections are not penalized with smaller MSS
just because lwIP is configured to support IPv6.





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