[lwip-devel] [bug #50206] UDP Netconn bind to IP6_ADDR_ANY fails

[Ivan Delamer]

URL:
  <http://savannah.nongnu.org/bugs/?50206>

                 Summary: UDP Netconn bind to IP6_ADDR_ANY fails
                 Project: lwIP - A Lightweight TCP/IP stack
            Submitted by: idelamer
            Submitted on: Wed 01 Feb 2017 05:34:17 PM MST
                Category: IPv6
                Severity: 3 - Normal
              Item Group: Faulty Behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: 2.0.0

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Details:

I have a UDP netconn, it starts of bound to ANY address in IPv4 and IPv6
(type=0x46)

I bind the netconn to a certain address on a netif (to force a certain source
address).

Then, when I try to bind it to IP6_ADDR_ANY again, the operation fails.

I see in api_lib that IP6_ADDR_ANY is substituted for IP_ADDR_ANY.

Later, in udp_bind, because the current address is a IPv6 address, then there
is a type mismatch and an error is returned.

I will temporarily solve this in my application using the
NETCONN_FLAG_IPV6_V6ONLY  but I think this needs to be fixed for dual-v4/v6
support.

I haven't have time to check if this happens in TCP netconns, but it might be
a good idea.

Cheers




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