[lwip-devel] [task #6995] Implement SO_REUSEADDR

[Simon Goldschmidt]

Update of task #6995 (project lwip):

                  Status:             In Progress => Done                   
        Percent Complete:                     90% => 100%                   
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #9:

> What remains is that for multicast/broadcast, received data 
> would have to be duplicated so that all (UDP-)PCBs listening on 
> the same port get a copy of the data.

Done. Added an extra option SO_REUSE_RXTOALL for that as it is kind of slow
(traverses the full udp_pcbs list a 2nd time for every broadcast/multicast
packet received).

Also, for full SO_REUSEADDR support, I had to add a 5-tuple-uniqueness-check
in tcp_connect() and tcp_listen().

The 3rd change was to allow binding multiple listening pcbs to the same port
by allowing IP_ADDR_ANY and specific IPs (e.g. IP of every netif) and then in
tcp_input(), first searching for a specific match and only if that fails
passing the SYN packet to the IP_ADDR_ANY-listening pcb.

All this only changed with SO_REUSE==1 (which is still off by default), so
doesn't have a negative impact for those who don't use it.

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