[Bug 1782] New: Wrong error printed when trying to add base chain named same as existing regular chain

[bugzilla-daemon at netfilter.org]

https://bugzilla.netfilter.org/show_bug.cgi?id=1782

            Bug ID: 1782
           Summary: Wrong error printed when trying to add base chain
                    named same as existing regular chain
           Product: nftables
           Version: 1.0.x
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P5
         Component: nft
          Assignee: pablo at netfilter.org
          Reporter: anton.khazan at gmail.com

When trying to add a base chain and a regular chain with matching name already
exists, wrong error is printed.

Steps to reproduce the issue:

nft add table test
nft add chain test t # add regular chain t
nft add chain test t { type filter hook postrouting priority 0\; policy
accept\; } # try to add base chain t

Output:
Error: Chain of type "filter" is not supported, perhaps kernel support is
missing?

Expected output: something like
Error: Regular chain "t" already exists.

When the regular chain "t" is removed, the above command works, so I believe
that the actual problem is not lack of support for chain of type "filter" but
rather the fact that same-named regular chain already exists.

Same behavior with  nft versions v1.0.8, v1.0.9

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