From: Pablo Neira Ayuso pablo@netfilter.org
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 --- net/netfilter/nf_tables_api.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3288,8 +3288,10 @@ static int nf_tables_newrule(struct net 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++; }