1 files changed, 26 insertions, 0 deletions
diff --git a/net/netfilter/utils.c b/net/netfilter/utils.c
new file mode 100644
index 000000000000..159a9cdcfe1e
--- /dev/null
+++ b/net/netfilter/utils.c
@@ -0,0 +1,26 @@
+#include <linux/kernel.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv6.h>
+
+__sum16 nf_checksum(struct sk_buff *skb, unsigned int hook,
+		    unsigned int dataoff, u_int8_t protocol,
+		    unsigned short family)
+{
+	const struct nf_ipv6_ops *v6ops;
+	__sum16 csum = 0;
+
+	switch (family) {
+	case AF_INET:
+		csum = nf_ip_checksum(skb, hook, dataoff, protocol);
+		break;
+	case AF_INET6:
+		v6ops = rcu_dereference(nf_ipv6_ops);
+		if (v6ops)
+			csum = v6ops->checksum(skb, hook, dataoff, protocol);
+		break;
+	}
+
+	return csum;
+}
+EXPORT_SYMBOL_GPL(nf_checksum);