arp: optimize interface name resolution #3133
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github.com/jsimonetti/rtnetlink provides a high level rtnl wrapper around the lower level rtnetlink functions, which essentially does all that we need. The rtnl.Conn.Neighbors uses an internal cache for resolving interface indexes to names, so it makes at most one rtnetlink call per interface to resolve the name. Using this high level wrapper hugely simplifies our code and makes it easier to understand and maintain. Fixes: prometheus#3075 Signed-off-by: Daniel Swarbrick <daniel.swarbrick@gmail.com>
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Go net package's net.InterfaceByIndex fetches the entire interface table behind the scenes, despite us specifying the interface index that we are interested in. This results in an exponential amount of rtnetlink traffic (and thus
recvfromsyscalls) as the number of interfaces in a host increases.Fixes: #3075