Generic Netlink multipart messages

[Matheus Rodrigues]

I'm trying to send a relatively "big" string (+/- 60Kb) through
generic netlink, for this, I know that I've to use the multipart
mechanism offered by the API, using the flags NLM_F_MULTI and
NLMSG_DONE, but I don't know how to implement it, there is some
example which breaks the string in various packages and send it to
kernel? I looked a lot for some example but I didn't find any that
does this. If there is none, so how do I do that using only the
mechanism offered by libnl and generic netlink?