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netfilter: bridge: add helpers for fetching physin/outdev

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right now we store this in the nf_bridge_info struct, accessible
via skb->nf_bridge.  This patch prepares removal of this pointer from skb:

Instead of using skb->nf_bridge->x, we use helpers to obtain the in/out
device (or ifindexes).

Followup patches to netfilter will then allow nf_bridge_info to be
obtained by a call into the br_netfilter core, rather than keeping a
pointer to it in sk_buff.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2015-04-02 14:31:41 +02:00 • committed by Pablo Neira Ayuso
commit c737b7c451
8 changed files with 97 additions and 34 deletions
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23
include/linux/netfilter_bridge.h
View file

@ -2,7 +2,7 @@
#define __LINUX_BRIDGE_NETFILTER_H
#include <uapi/linux/netfilter_bridge.h>
#include <linux/skbuff.h>
enum nf_br_hook_priorities {
NF_BR_PRI_FIRST = INT_MIN,
@ -40,6 +40,27 @@ static inline void br_drop_fake_rtable(struct sk_buff *skb)
skb_dst_drop(skb);
}
static inline int nf_bridge_get_physinif(const struct sk_buff *skb)
{
return skb->nf_bridge ? skb->nf_bridge->physindev->ifindex : 0;
}
static inline int nf_bridge_get_physoutif(const struct sk_buff *skb)
{
return skb->nf_bridge ? skb->nf_bridge->physoutdev->ifindex : 0;
}
static inline struct net_device *
nf_bridge_get_physindev(const struct sk_buff *skb)
{
return skb->nf_bridge ? skb->nf_bridge->physindev : NULL;
}
static inline struct net_device *
nf_bridge_get_physoutdev(const struct sk_buff *skb)
{
return skb->nf_bridge ? skb->nf_bridge->physoutdev : NULL;
}
#else
#define br_drop_fake_rtable(skb) do { } while (0)
#endif /* CONFIG_BRIDGE_NETFILTER */