mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![David Howells](/assets/img/avatar_default.png)
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
#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,
|
|
};
|
|
|
|
#ifdef 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
|
|
|
|
/* Only used in br_forward.c */
|
|
extern int nf_bridge_copy_header(struct sk_buff *skb);
|
|
static inline int nf_bridge_maybe_copy_header(struct sk_buff *skb)
|
|
{
|
|
if (skb->nf_bridge &&
|
|
skb->nf_bridge->mask & (BRNF_BRIDGED | BRNF_BRIDGED_DNAT))
|
|
return nf_bridge_copy_header(skb);
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
extern int br_handle_frame_finish(struct sk_buff *skb);
|
|
/* Only used in br_device.c */
|
|
static inline int br_nf_pre_routing_finish_bridge_slow(struct sk_buff *skb)
|
|
{
|
|
struct nf_bridge_info *nf_bridge = skb->nf_bridge;
|
|
|
|
skb_pull(skb, ETH_HLEN);
|
|
nf_bridge->mask ^= BRNF_BRIDGED_DNAT;
|
|
skb_copy_to_linear_data_offset(skb, -(ETH_HLEN-ETH_ALEN),
|
|
skb->nf_bridge->data, ETH_HLEN-ETH_ALEN);
|
|
skb->dev = nf_bridge->physindev;
|
|
return br_handle_frame_finish(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;
|
|
}
|
|
|
|
struct bridge_skb_cb {
|
|
union {
|
|
__be32 ipv4;
|
|
} daddr;
|
|
};
|
|
|
|
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_maybe_copy_header(skb) (0)
|
|
#define nf_bridge_pad(skb) (0)
|
|
#define br_drop_fake_rtable(skb) do { } while (0)
|
|
#endif /* CONFIG_BRIDGE_NETFILTER */
|
|
|
|
#endif
|