Linux kernel mirror (for testing)
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linux
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
9static 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 */
19static 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
41static 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 */
46static inline int nf_hook_ingress_active(struct sk_buff *skb)
47{
48 return 0;
49}
50
51static inline int nf_hook_ingress(struct sk_buff *skb)
52{
53 return 0;
54}
55
56static inline void nf_hook_ingress_init(struct net_device *dev) {}
57#endif /* CONFIG_NETFILTER_INGRESS */
58#endif /* _NETFILTER_INGRESS_H_ */