Lennart Poettering
5d0fe4233b
A variety of sockopts exist both for IPv4 and IPv6 but require a different pair of sockopt level/option number. Let's add helpers for these that internally determine the right sockopt to call. This should shorten code that generically wants to support both ipv4 + ipv6 and for the first time adds correct support for some cases where we only called the ipv4 versions, and not the ipv6 options.
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