From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Tue, 17 Mar 2015 12:21:42 +0000 (+0100)
Subject: netfilter: nf_tables: allow to change chain policy without hook if it exists
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d6b6cb1d3e6f78d55c2d4043d77d0d8def3f3b99;p=openwrt%2Fstaging%2Fblogic.git

netfilter: nf_tables: allow to change chain policy without hook if it exists

If there's an existing base chain, we have to allow to change the
default policy without indicating the hook information.

However, if the chain doesn't exists, we have to enforce the presence of
the hook attribute.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 6ab777912237..ac1a9528dbf2 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1225,7 +1225,10 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
 
 	if (nla[NFTA_CHAIN_POLICY]) {
 		if ((chain != NULL &&
-		    !(chain->flags & NFT_BASE_CHAIN)) ||
+		    !(chain->flags & NFT_BASE_CHAIN)))
+			return -EOPNOTSUPP;
+
+		if (chain == NULL &&
 		    nla[NFTA_CHAIN_HOOK] == NULL)
 			return -EOPNOTSUPP;