1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NETFILTER_INGRESS_H_
3 #define _NETFILTER_INGRESS_H_
4
5 #include <linux/netfilter.h>
6 #include <linux/netdevice.h>
7
8 #ifdef CONFIG_NETFILTER_INGRESS
nf_hook_ingress_active(const struct sk_buff * skb)9 static inline bool nf_hook_ingress_active(const struct sk_buff *skb)
10 {
11 #ifdef CONFIG_JUMP_LABEL
12 if (!static_key_false(&nf_hooks_needed[NFPROTO_NETDEV][NF_NETDEV_INGRESS]))
13 return false;
14 #endif
15 return rcu_access_pointer(skb->dev->nf_hooks_ingress);
16 }
17
18 /* caller must hold rcu_read_lock */
nf_hook_ingress(struct sk_buff * skb)19 static inline int nf_hook_ingress(struct sk_buff *skb)
20 {
21 struct nf_hook_entries *e = rcu_dereference(skb->dev->nf_hooks_ingress);
22 struct nf_hook_state state;
23 int ret;
24
25 /* Must recheck the ingress hook head, in the event it became NULL
26 * after the check in nf_hook_ingress_active evaluated to true.
27 */
28 if (unlikely(!e))
29 return 0;
30
31 nf_hook_state_init(&state, NF_NETDEV_INGRESS,
32 NFPROTO_NETDEV, skb->dev, NULL, NULL,
33 dev_net(skb->dev), NULL);
34 ret = nf_hook_slow(skb, &state, e, 0);
35 if (ret == 0)
36 return -1;
37
38 return ret;
39 }
40
nf_hook_ingress_init(struct net_device * dev)41 static inline void nf_hook_ingress_init(struct net_device *dev)
42 {
43 RCU_INIT_POINTER(dev->nf_hooks_ingress, NULL);
44 }
45 #else /* CONFIG_NETFILTER_INGRESS */
nf_hook_ingress_active(struct sk_buff * skb)46 static inline int nf_hook_ingress_active(struct sk_buff *skb)
47 {
48 return 0;
49 }
50
nf_hook_ingress(struct sk_buff * skb)51 static inline int nf_hook_ingress(struct sk_buff *skb)
52 {
53 return 0;
54 }
55
nf_hook_ingress_init(struct net_device * dev)56 static inline void nf_hook_ingress_init(struct net_device *dev) {}
57 #endif /* CONFIG_NETFILTER_INGRESS */
58 #endif /* _NETFILTER_INGRESS_H_ */
59