netdev - [PATCH net-next 3/3] netfilter: nft_tunnel: support for tunnel type

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Message-Id: <20181009222439.29399-4-pablo@netfilter.org>
Date:   Wed, 10 Oct 2018 00:24:39 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        roopa@...ulusnetworks.com, amir@...ai.me, pshelar@....org,
        u9012063@...il.com, daniel@...earbox.net,
        jakub.kicinski@...ronome.com
Subject: [PATCH net-next 3/3] netfilter: nft_tunnel: support for tunnel type

This patch allows you to set an explicit tunnel driver type in the
metadata template. In case of misconfiguration, ie. if the packets ends
up in the wrong tunnel device, the packet is dropped.

Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 include/uapi/linux/netfilter/nf_tables.h | 1 +
 net/netfilter/nft_tunnel.c               | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
index 5444e76870bb..f484dace2b4b 100644
--- a/include/uapi/linux/netfilter/nf_tables.h
+++ b/include/uapi/linux/netfilter/nf_tables.h
@@ -1703,6 +1703,7 @@ enum nft_tunnel_key_attributes {
 	NFTA_TUNNEL_KEY_SPORT,
 	NFTA_TUNNEL_KEY_DPORT,
 	NFTA_TUNNEL_KEY_OPTS,
+	NFTA_TUNNEL_KEY_TYPE,
 	__NFTA_TUNNEL_KEY_MAX
 };
 #define NFTA_TUNNEL_KEY_MAX	(__NFTA_TUNNEL_KEY_MAX - 1)
diff --git a/net/netfilter/nft_tunnel.c b/net/netfilter/nft_tunnel.c
index 3a15f219e4e7..2513968d8503 100644
--- a/net/netfilter/nft_tunnel.c
+++ b/net/netfilter/nft_tunnel.c
@@ -305,6 +305,7 @@ static const struct nla_policy nft_tunnel_key_policy[NFTA_TUNNEL_KEY_MAX + 1] =
 	[NFTA_TUNNEL_KEY_TOS]	= { .type = NLA_U8, },
 	[NFTA_TUNNEL_KEY_TTL]	= { .type = NLA_U8, },
 	[NFTA_TUNNEL_KEY_OPTS]	= { .type = NLA_NESTED, },
+	[NFTA_TUNNEL_KEY_TYPE]	= { .type = NLA_U32, },
 };
 
 static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
@@ -312,6 +313,7 @@ static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
 			       struct nft_object *obj)
 {
 	struct nft_tunnel_obj *priv = nft_obj_data(obj);
+	u32 type = TUNNEL_TYPE_UNSPEC;
 	struct ip_tunnel_info info;
 	struct metadata_dst *md;
 	int err;
@@ -319,7 +321,11 @@ static int nft_tunnel_obj_init(const struct nft_ctx *ctx,
 	if (!tb[NFTA_TUNNEL_KEY_ID])
 		return -EINVAL;
 
+	if (tb[NFTA_TUNNEL_KEY_TYPE])
+		type = ntohl(nla_get_be32(tb[NFTA_TUNNEL_KEY_TYPE]));
+
 	memset(&info, 0, sizeof(info));
+	info.type		= type;
 	info.mode		= IP_TUNNEL_INFO_TX;
 	info.key.tun_id		= key32_to_tunnel_id(nla_get_be32(tb[NFTA_TUNNEL_KEY_ID]));
 	info.key.tun_flags	= TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
@@ -494,7 +500,8 @@ static int nft_tunnel_obj_dump(struct sk_buff *skb,
 	struct nft_tunnel_obj *priv = nft_obj_data(obj);
 	struct ip_tunnel_info *info = &priv->md->u.tun_info;
 
-	if (nla_put_be32(skb, NFTA_TUNNEL_KEY_ID,
+	if (nla_put_be32(skb, NFTA_TUNNEL_KEY_TYPE, htonl(info->type)) ||
+	    nla_put_be32(skb, NFTA_TUNNEL_KEY_ID,
 			 tunnel_id_to_key32(info->key.tun_id)) ||
 	    nft_tunnel_ip_dump(skb, info) < 0 ||
 	    nft_tunnel_ports_dump(skb, info) < 0 ||
-- 
2.11.0