[lwip-devel] [bug #36403] ip4_input() and ip6_input() always pass inp to higher layers

[Ivan Delamer]

URL:
  <http://savannah.nongnu.org/bugs/?36403>

                 Summary: ip4_input() and ip6_input() always pass inp to
higher layers
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: idelamer
            Submitted on: Fri 04 May 2012 06:33:41 PM MDT
                Category: None
                Severity: 2 - Minor
              Item Group: None
                  Status: Need Info
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: 
            lwIP version: CVS Head

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Details:

Thanks to Enrico Lehmann for bringing this up.

Both ip4_input() and ip6_input() will go through all enabled netifs looking
for an address match. We may accept a packet on a different netif than the one
it was accepted on. This provides simple routing behavior.

When a packet is passed to the next layer, inp (receiving netif) is always
passed.

Should we be passing inp, or netif (accepted) ?

Not sure if this is a bug or what consequences it has. Intuitively I think we
should be passing the accepted netif, but keeping a reference to inp means we
can send response packets on the same netif that we received data...

Comments?




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