projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| e687ad60 PN |
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 | |
| 61b590b9 | 9 | static inline bool nf_hook_ingress_active(const struct sk_buff *skb) |
| e687ad60 | 10 | { |
| 61b590b9 FW |
11 | #ifdef HAVE_JUMP_LABEL |
| 12 | if (!static_key_false(&nf_hooks_needed[NFPROTO_NETDEV][NF_NETDEV_INGRESS])) | |
| 13 | return false; | |
| 14 | #endif | |
| e3b37f11 | 15 | return rcu_access_pointer(skb->dev->nf_hooks_ingress); |
| e687ad60 PN |
16 | } |
| 17 | ||
| fe72926b | 18 | /* caller must hold rcu_read_lock */ |
| e687ad60 PN |
19 | static inline int nf_hook_ingress(struct sk_buff *skb) |
| 20 | { | |
| 960632ec | 21 | struct nf_hook_entries *e = rcu_dereference(skb->dev->nf_hooks_ingress); |
| e687ad60 | 22 | struct nf_hook_state state; |
| df122f58 | 23 | int ret; |
| e687ad60 | 24 | |
| e3b37f11 AC |
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 | ||
| 01886bd9 | 31 | nf_hook_state_init(&state, NF_NETDEV_INGRESS, |
| e3b37f11 AC |
32 | NFPROTO_NETDEV, skb->dev, NULL, NULL, |
| 33 | dev_net(skb->dev), NULL); | |
| 960632ec | 34 | ret = nf_hook_slow(skb, &state, e, 0); |
| df122f58 FW |
35 | if (ret == 0) |
| 36 | return -1; | |
| 37 | ||
| 38 | return ret; | |
| e687ad60 PN |
39 | } |
| 40 | ||
| 41 | static inline void nf_hook_ingress_init(struct net_device *dev) | |
| 42 | { | |
| e3b37f11 | 43 | RCU_INIT_POINTER(dev->nf_hooks_ingress, NULL); |
| e687ad60 PN |
44 | } |
| 45 | #else /* CONFIG_NETFILTER_INGRESS */ | |
| 46 | static inline int nf_hook_ingress_active(struct sk_buff *skb) | |
| 47 | { | |
| 48 | return 0; | |
| 49 | } | |
| 50 | ||
| 51 | static inline int nf_hook_ingress(struct sk_buff *skb) | |
| 52 | { | |
| 53 | return 0; | |
| 54 | } | |
| 55 | ||
| 56 | static inline void nf_hook_ingress_init(struct net_device *dev) {} | |
| 57 | #endif /* CONFIG_NETFILTER_INGRESS */ | |
| 58 | #endif /* _NETFILTER_INGRESS_H_ */ |