[lwip-devel] [bug #65581] UDP Socket Bind Should Bind To Device

[Matt Grochowalski]

URL:
  <https://savannah.nongnu.org/bugs/?65581>

                 Summary: UDP Socket Bind Should Bind To Device
                   Group: lwIP - A Lightweight TCP/IP stack
               Submitter: grochoge
               Submitted: Wed 10 Apr 2024 07:02:45 PM UTC
                Category: UDP
                Severity: 3 - Normal
              Item Group: Change Request
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None
            lwIP version: git head


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 10 Apr 2024 07:02:45 PM UTC By: Matt Grochowalski <grochoge>
I'm porting an existing application that sends multicast traffic via the
Berkley socket API (in this case on Windows) and running into an issue.

Example usage:
1. bind() to 192.168.1.1
2. sendto() to 224.0.0.1

Result in Windows:
Packet is sent out over interface 192.168.1.1 to 224.0.0.1

Result in LWIP:
Send fails with ERR_RTE/EHOSTUNREACH

I see LWIP has the ability to bind to a specific interface, but does not do so
with a normal bind() call.
I believe an option should be added to do so in a normal bind() call,
returning an error if a netif with the bound address doesn't exist.







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