netfilter: nf_tables: report EEXIST on overlaps
Replace EBUSY by EEXIST in the following cases: - If the user adds a chain with a different configuration such as different type, hook and priority. - If the user adds a non-base chain that clashes with an existing basechain. - If the user adds a { key : value } mapping element and the key exists but the value differs. - If the device already belongs to an existing flowtable. User describe that this error reporting is confusing: - https://bugzilla.netfilter.org/show_bug.cgi?id=1176 - https://bugzilla.netfilter.org/show_bug.cgi?id=1413Signed-off-by:Pablo Neira Ayuso <pablo@netfilter.org>
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