[Feature Request] Support IPv6 Unique Local Address

[marcusb]

Is your feature request related to a problem? Please describe.

The IPv6 code does not support the ULA prefix fc00::/7, resulting in multiple things breaking when using these addresses.

Since IPv6_Type_t does not contain an enum value for ULA, these addresses are treated as eIPv6_Unknown as returned by xIPv6_GetIPType(). As a result, endpoints with a ULA address fail to match received packets by IP address, see pxEasyFit().

Describe the solution you'd like

Add an enum value to IPv6_Type_t for ULA addresses. Update all code that examines address types to include testing for this enum as appropriate.

[htibosch]

@marcusb, thanks for creating this issue. Indeed we haven't though yet of supporting ULA addresses. We only have 0xFE80 addresses.

Would you like to contribute and propose a pull request (PR)? Or if that is too much, could you help by summarizing what you expect of the changes?

Thanks