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>

1 files changed, 8 insertions, 0 deletions

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);