Prepare for addition of a netfilter egress hook by generalizing the
ingress hook introduced by commit e687ad60af09 ("netfilter: add
netfilter ingress hook after handle_ing() under unique static key").
In particular, rename and refactor the ingress hook's static inlines
such that they can be reused for an egress hook.
No functional change intended.
Signed-off-by: Lukas Wunner <lukas@xxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
---
include/linux/netfilter_netdev.h | 45 ++++++++++++++++++++++----------
net/core/dev.c | 2 +-
2 files changed, 32 insertions(+), 15 deletions(-)
diff --git a/include/linux/netfilter_netdev.h b/include/linux/netfilter_netdev.h
index a13774be2eb5..49e26479642e 100644
--- a/include/linux/netfilter_netdev.h
+++ b/include/linux/netfilter_netdev.h
@@ -1,34 +1,37 @@
/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _NETFILTER_INGRESS_H_
-#define _NETFILTER_INGRESS_H_
+#ifndef _NETFILTER_NETDEV_H_
+#define _NETFILTER_NETDEV_H_
#include <linux/netfilter.h>
#include <linux/netdevice.h>
-#ifdef CONFIG_NETFILTER_INGRESS
-static inline bool nf_hook_ingress_active(const struct sk_buff *skb)
+#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][NF_NETDEV_INGRESS]))
+ if (!static_key_false(&nf_hooks_needed[NFPROTO_NETDEV][hooknum]))
return false;
#endif
- return rcu_access_pointer(skb->dev->nf_hooks_ingress);
+ return rcu_access_pointer(hooks);
}
/* caller must hold rcu_read_lock */
-static inline int nf_hook_ingress(struct sk_buff *skb)
+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(skb->dev->nf_hooks_ingress);
+ struct nf_hook_entries *e = rcu_dereference(hooks);
struct nf_hook_state state;
int ret;
- /* Must recheck the ingress hook head, in the event it became NULL
- * after the check in nf_hook_ingress_active evaluated to true.
+ /* 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, NF_NETDEV_INGRESS,
+ 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);
@@ -37,10 +40,26 @@ static inline int nf_hook_ingress(struct sk_buff *skb)
return ret;
}
+#endif /* CONFIG_NETFILTER */
-static inline void nf_hook_ingress_init(struct net_device *dev)
+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_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)
@@ -52,7 +71,5 @@ static inline int nf_hook_ingress(struct sk_buff *skb)
{
return 0;
}
-
-static inline void nf_hook_ingress_init(struct net_device *dev) {}
#endif /* CONFIG_NETFILTER_INGRESS */
#endif /* _NETFILTER_INGRESS_H_ */
diff --git a/net/core/dev.c b/net/core/dev.c
index b378b669a8ab..2e55d4e41517 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -9844,7 +9844,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
if (!dev->ethtool_ops)
dev->ethtool_ops = &default_ethtool_ops;
- nf_hook_ingress_init(dev);
+ nf_hook_netdev_init(dev);
return dev;
--
2.25.0
