Babel: Implement IPv6 prefix compression on outgoing updates
Previously, the Babel protocol would never use prefix compression on outgoing updates (but would parse it on incoming ones). This adds compression of IPv6 addresses of outgoing updates. The compression only works to the extent that the FIB is walked in lexicographic order; i.e. a prefix is only compressed if it shares bytes with the previous prefix in the same packet. Thanks to Toke Høiland-Jørgensen <firstname.lastname@example.org> for the patch.
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