netfilter: nf_tables: missing error reporting for not selected expressions

commit c781471d67a56d7d4c113669a11ede0463b5c719 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: 83d9dcba06c5 ("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>

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 7bf7bfa..e34d05c 100644 (file)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -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++;
                }