1 files changed, 102 insertions, 0 deletions
diff --git a/include/linux/netfilter_netdev.h b/include/linux/netfilter_netdev.h
new file mode 100644
index 000000000000..92d3611a782e
--- /dev/null
+++ b/include/linux/netfilter_netdev.h
@@ -0,0 +1,102 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NETFILTER_NETDEV_H_
+#define _NETFILTER_NETDEV_H_
+
+#include <linux/netfilter.h>
+#include <linux/netdevice.h>
+
+#ifdef CONFIG_NETFILTER
+static __always_inline bool nf_hook_netdev_active(enum nf_dev_hooks hooknum,
+					  struct nf_hook_entries __rcu *hooks)
+{
+#ifdef CONFIG_JUMP_LABEL
+	if (!static_key_false(&nf_hooks_needed[NFPROTO_NETDEV][hooknum]))
+		return false;
+#endif
+	return rcu_access_pointer(hooks);
+}
+
+/* caller must hold rcu_read_lock */
+static __always_inline int nf_hook_netdev(struct sk_buff *skb,
+					  enum nf_dev_hooks hooknum,
+					  struct nf_hook_entries __rcu *hooks)
+{
+	struct nf_hook_entries *e = rcu_dereference(hooks);
+	struct nf_hook_state state;
+	int ret;
+
+	/* Must recheck the hook head, in the event it became NULL
+	 * after the check in nf_hook_netdev_active evaluated to true.
+	 */
+	if (unlikely(!e))
+		return 0;
+
+	nf_hook_state_init(&state, hooknum,
+			   NFPROTO_NETDEV, skb->dev, NULL, NULL,
+			   dev_net(skb->dev), NULL);
+	ret = nf_hook_slow(skb, &state, e, 0);
+	if (ret == 0)
+		return -1;
+
+	return ret;
+}
+#endif /* CONFIG_NETFILTER */
+
+static inline void nf_hook_netdev_init(struct net_device *dev)
+{
+#ifdef CONFIG_NETFILTER_INGRESS
+	RCU_INIT_POINTER(dev->nf_hooks_ingress, NULL);
+#endif
+#ifdef CONFIG_NETFILTER_EGRESS
+	RCU_INIT_POINTER(dev->nf_hooks_egress, NULL);
+#endif
+}
+
+#ifdef CONFIG_NETFILTER_INGRESS
+static inline bool nf_hook_ingress_active(const struct sk_buff *skb)
+{
+	return nf_hook_netdev_active(NF_NETDEV_INGRESS,
+				     skb->dev->nf_hooks_ingress);
+}
+
+static inline int nf_hook_ingress(struct sk_buff *skb)
+{
+	return nf_hook_netdev(skb, NF_NETDEV_INGRESS,
+			      skb->dev->nf_hooks_ingress);
+}
+#else /* CONFIG_NETFILTER_INGRESS */
+static inline int nf_hook_ingress_active(struct sk_buff *skb)
+{
+	return 0;
+}
+
+static inline int nf_hook_ingress(struct sk_buff *skb)
+{
+	return 0;
+}
+#endif /* CONFIG_NETFILTER_INGRESS */
+
+#ifdef CONFIG_NETFILTER_EGRESS
+static inline bool nf_hook_egress_active(const struct sk_buff *skb)
+{
+	return nf_hook_netdev_active(NF_NETDEV_EGRESS,
+				     skb->dev->nf_hooks_egress);
+}
+
+static inline int nf_hook_egress(struct sk_buff *skb)
+{
+	return nf_hook_netdev(skb, NF_NETDEV_EGRESS,
+			      skb->dev->nf_hooks_egress);
+}
+#else /* CONFIG_NETFILTER_EGRESS */
+static inline int nf_hook_egress_active(struct sk_buff *skb)
+{
+	return 0;
+}
+
+static inline int nf_hook_egress(struct sk_buff *skb)
+{
+	return 0;
+}
+#endif /* CONFIG_NETFILTER_EGRESS */
+#endif /* _NETFILTER_INGRESS_H_ */