1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_BRIDGE_NETFILTER_H
3 #define __LINUX_BRIDGE_NETFILTER_H
4 
5 #include <uapi/linux/netfilter_bridge.h>
6 #include <linux/skbuff.h>
7 
8 struct nf_bridge_frag_data {
9 	char    mac[ETH_HLEN];
10 	bool    vlan_present;
11 	u16     vlan_tci;
12 	__be16  vlan_proto;
13 };
14 
15 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
16 
17 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
18 
br_drop_fake_rtable(struct sk_buff * skb)19 static inline void br_drop_fake_rtable(struct sk_buff *skb)
20 {
21 	struct dst_entry *dst = skb_dst(skb);
22 
23 	if (dst && (dst->flags & DST_FAKE_RTABLE))
24 		skb_dst_drop(skb);
25 }
26 
27 static inline struct nf_bridge_info *
nf_bridge_info_get(const struct sk_buff * skb)28 nf_bridge_info_get(const struct sk_buff *skb)
29 {
30 	return skb_ext_find(skb, SKB_EXT_BRIDGE_NF);
31 }
32 
nf_bridge_info_exists(const struct sk_buff * skb)33 static inline bool nf_bridge_info_exists(const struct sk_buff *skb)
34 {
35 	return skb_ext_exist(skb, SKB_EXT_BRIDGE_NF);
36 }
37 
nf_bridge_get_physinif(const struct sk_buff * skb)38 static inline int nf_bridge_get_physinif(const struct sk_buff *skb)
39 {
40 	const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
41 
42 	if (!nf_bridge)
43 		return 0;
44 
45 	return nf_bridge->physinif;
46 }
47 
nf_bridge_get_physoutif(const struct sk_buff * skb)48 static inline int nf_bridge_get_physoutif(const struct sk_buff *skb)
49 {
50 	const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
51 
52 	if (!nf_bridge)
53 		return 0;
54 
55 	return nf_bridge->physoutdev ? nf_bridge->physoutdev->ifindex : 0;
56 }
57 
58 static inline struct net_device *
nf_bridge_get_physindev(const struct sk_buff * skb,struct net * net)59 nf_bridge_get_physindev(const struct sk_buff *skb, struct net *net)
60 {
61 	const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
62 
63 	return nf_bridge ? dev_get_by_index_rcu(net, nf_bridge->physinif) : NULL;
64 }
65 
66 static inline struct net_device *
nf_bridge_get_physoutdev(const struct sk_buff * skb)67 nf_bridge_get_physoutdev(const struct sk_buff *skb)
68 {
69 	const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
70 
71 	return nf_bridge ? nf_bridge->physoutdev : NULL;
72 }
73 
nf_bridge_in_prerouting(const struct sk_buff * skb)74 static inline bool nf_bridge_in_prerouting(const struct sk_buff *skb)
75 {
76 	const struct nf_bridge_info *nf_bridge = nf_bridge_info_get(skb);
77 
78 	return nf_bridge && nf_bridge->in_prerouting;
79 }
80 #else
81 #define br_drop_fake_rtable(skb)	        do { } while (0)
nf_bridge_in_prerouting(const struct sk_buff * skb)82 static inline bool nf_bridge_in_prerouting(const struct sk_buff *skb)
83 {
84 	return false;
85 }
86 #endif /* CONFIG_BRIDGE_NETFILTER */
87 
88 #endif
89