[lwip-devel] [bug #27352] Change ip_addr from struct to typedef (u32_t)

[Simon Goldschmidt]

Update of bug #27352 (project lwip):

                  Status:                    None => Need Info              

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Follow-up Comment #6:

There is one problem here: the address pointer as passed to the recv callback
functions might be unaligned since it currently points into the pbuf payload.
If we wanted to remove packing from struct ip_addr or use an u32_t (and an
u32_t pointer in the callbacks?), we either would
a) have to copy the address or
b) directly use an u32_t for the callbacks instead of a pointer

The problem with a) is the addresses scope when it is passed on to
netconn/socket api. The problem with b) is that it is uneffective with IPv6.

Given that, I'd chose a) and copy the address when using netconn/socket api
because that way, we prevent having to change the api again once IPv6 gets
usable again (which I'd like to see).

Any other opinions?

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  <http://savannah.nongnu.org/bugs/?27352>

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