From mboxrd@z Thu Jan  1 00:00:00 1970
From: Florian Westphal <fw@strlen.de>
Subject: Re: Creating a map programmatically using the C library libnftnl
Date: Thu, 30 Mar 2023 21:55:53 +0200
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To: Kiernan George <kbg98@vt.edu>
Cc: Florian Westphal <fw@strlen.de>, netfilter@vger.kernel.org

Kiernan George <kbg98@vt.edu> wrote:
> That works to create the map, but when I go to add an element through
> the command line it fails with this error:
> 
> root@laptop:/tmp# nft add element netdev example test2 { 1.1.1.1 .
> 1111 : 2.2.2.2 }
> Error: Could not process rule: File exists 
> add element netdev example test2 { 1.1.1.1 . 1111 : 2.2.2.2 }
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
> Do you have any insight?

Worksforme.  'File exists' hints that you are adding the same element
again.  The key has to be unique, so:

add element netdev example test2 { 1.1.1.1 . 1111 : 2.2.2.2 }
add element netdev example test2 { 1.1.1.1 . 1111 : 2.2.2.3 } // Fails even if value is different