1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _NETFILTER_NETDEV_H_ 3 #define _NETFILTER_NETDEV_H_ 4 5 #include <linux/netfilter.h> 6 #include <linux/netdevice.h> 7 8 #ifdef CONFIG_NETFILTER_INGRESS 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 */ 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 41 #else /* CONFIG_NETFILTER_INGRESS */ 42 static inline int nf_hook_ingress_active(struct sk_buff *skb) 43 { 44 return 0; 45 } 46 47 static inline int nf_hook_ingress(struct sk_buff *skb) 48 { 49 return 0; 50 } 51 #endif /* CONFIG_NETFILTER_INGRESS */ 52 53 static inline void nf_hook_netdev_init(struct net_device *dev) 54 { 55 #ifdef CONFIG_NETFILTER_INGRESS 56 RCU_INIT_POINTER(dev->nf_hooks_ingress, NULL); 57 #endif 58 } 59 60 #endif /* _NETFILTER_NETDEV_H_ */ 61