From: David Lebrun <david.lebrun@uclouvain.be>
Date: Fri, 25 Aug 2017 07:56:46 +0000 (+0200)
Subject: ipv6: sr: enforce IPv6 packets for seg6local lwt
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=6285217f0c29e68b744533a9ddf50e110d36d65e;p=openwrt%2Fstaging%2Fblogic.git

ipv6: sr: enforce IPv6 packets for seg6local lwt

This patch ensures that the seg6local lightweight tunnel is used solely
with IPv6 routes and processes only IPv6 packets.

Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c
index 609b94e970de..c6263256fcf6 100644
--- a/net/ipv6/seg6_local.c
+++ b/net/ipv6/seg6_local.c
@@ -357,6 +357,11 @@ static int seg6_local_input(struct sk_buff *skb)
 	struct seg6_action_desc *desc;
 	struct seg6_local_lwt *slwt;
 
+	if (skb->protocol != htons(ETH_P_IPV6)) {
+		kfree_skb(skb);
+		return -EINVAL;
+	}
+
 	slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
 	desc = slwt->desc;
 
@@ -623,6 +628,9 @@ static int seg6_local_build_state(struct nlattr *nla, unsigned int family,
 	struct seg6_local_lwt *slwt;
 	int err;
 
+	if (family != AF_INET6)
+		return -EINVAL;
+
 	err = nla_parse_nested(tb, SEG6_LOCAL_MAX, nla, seg6_local_policy,
 			       extack);