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netfilter: nf_tables: missing error reporting for not selected expressions

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commit c781471d67 upstream.

Sometimes users forget to turn on nftables extensions from Kconfig that
they need. In such case, the error reporting from userspace is
misleading:

 $ sudo nft add rule x y counter
 Error: Could not process rule: No such file or directory
 add rule x y counter
 ^^^^^^^^^^^^^^^^^^^^

Add missing NL_SET_BAD_ATTR() to provide a hint:

 $ nft add rule x y counter
 Error: Could not process rule: No such file or directory
 add rule x y counter
              ^^^^^^^

Fixes: 83d9dcba06 ("netfilter: nf_tables: extended netlink error reporting for expressions")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso 2021-05-19 13:32:20 +02:00 committed by Greg Kroah-Hartman
parent eddf2d9f76
commit 316de9a88c
1 changed files with 3 additions and 1 deletions
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4
net/netfilter/nf_tables_api.c
View file

@ -3263,8 +3263,10 @@ static int nf_tables_newrule(struct net *net, struct sock *nlsk,
if (n == NFT_RULE_MAXEXPRS)
goto err1;
err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
if (err < 0)
if (err < 0) {
NL_SET_BAD_ATTR(extack, tmp);
goto err1;
}
size += info[n].ops->size;
n++;
}