No way to obtain a `LinkAddr` on Linux

[rotty]

On Linux, there is no method SockaddrStorage::as_link_addr, so it is not possible to obtain a MAC address for an interface using safe Rust. I cooked up the following, which seems to work, but it feels like this should be possible using only safe code:

fn sockaddr_link(sockaddr: &SockaddrStorage) -> Option<LinkAddr> {
    if let Some(AddressFamily::Packet) = sockaddr.family() {
        // Safety: Checked the address family
        unsafe { LinkAddr::from_raw(sockaddr.as_ptr(), None) }
    } else {
        None
    }
}

[asomers]

That's an oversight. Thanks for pointing it out.