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directory in /proc/sys/net/ipv4/config have no hard links?

Why the directories inside /proc/sys/net/ipv4/config have no hard links? ls -l /proc/sys/net/ipv4/conf total 0 dr-xr-xr-x 0 root root 0 Dec 31 08:27 all dr-xr-xr-x 0 root root 0 Dec 31 08:27 default ...