[lwip-devel] [patch #6410] Correlation between TCP MSS and netif MTU

[Marc Chaland]

URL:
  <http://savannah.nongnu.org/patch/?6410>

                 Summary: Correlation between TCP MSS and netif MTU
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: chaland
            Submitted on: jeudi 07.02.2008 à 13:35
                Category: None
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None

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Details:

When client tries to connect to lwip on one interface with a reduced MTU, MSS
is not reduced.

I suggest following change :
into lwipopts.h, add the following define :
#define TCP_MSS_OFFSET          40

into tcp_in.c line 397 (CVS-1.97) :
#ifdef TCP_MSS_OFFSET
  u16_t mss;
#endif /* TCP_MSS_OFFSET */

into tcp_in.c line 432 (CVS-1.97) :
#ifdef TCP_MSS_OFFSET
    mss = mtu - TCP_MSS_OFFSET;
    if ((mss < npcb->mss) && (mss > TCP_MSS_MIN)) {
        npcb->mss = mss;
    }
#endif /* TCP_MSS_OFFSET */





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