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#ifndef __LINUX_BRIDGE_NETFILTER_H
#define __LINUX_BRIDGE_NETFILTER_H
#include <uapi/linux/netfilter_bridge.h>
enum nf_br_hook_priorities {
NF_BR_PRI_FIRST = INT_MIN,
NF_BR_PRI_NAT_DST_BRIDGED = -300,
NF_BR_PRI_FILTER_BRIDGED = -200,
NF_BR_PRI_BRNF = 0,
NF_BR_PRI_NAT_DST_OTHER = 100,
NF_BR_PRI_FILTER_OTHER = 200,
NF_BR_PRI_NAT_SRC = 300,
NF_BR_PRI_LAST = INT_MAX,
};
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
#define BRNF_PKT_TYPE 0x01
#define BRNF_BRIDGED_DNAT 0x02
#define BRNF_BRIDGED 0x04
#define BRNF_NF_BRIDGE_PREROUTING 0x08
#define BRNF_8021Q 0x10
#define BRNF_PPPoE 0x20
static inline unsigned int nf_bridge_encap_header_len(const struct sk_buff *skb)
{
switch (skb->protocol) {
case __cpu_to_be16(ETH_P_8021Q):
return VLAN_HLEN;
case __cpu_to_be16(ETH_P_PPP_SES):
return PPPOE_SES_HLEN;
default:
return 0;
}
}
static inline unsigned int nf_bridge_mtu_reduction(const struct sk_buff *skb)
{
if (unlikely(skb->nf_bridge->mask & BRNF_PPPoE))
return PPPOE_SES_HLEN;
return 0;
}
int br_handle_frame_finish(struct sk_buff *skb);
/* This is called by the IP fragmenting code and it ensures there is
* enough room for the encapsulating header (if there is one). */
static inline unsigned int nf_bridge_pad(const struct sk_buff *skb)
{
if (skb->nf_bridge)
return nf_bridge_encap_header_len(skb);
return 0;
}
static inline void br_drop_fake_rtable(struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
if (dst && (dst->flags & DST_FAKE_RTABLE))
skb_dst_drop(skb);
}
#else
#define nf_bridge_pad(skb) (0)
#define br_drop_fake_rtable(skb) do { } while (0)
#endif /* CONFIG_BRIDGE_NETFILTER */
#endif
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