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netfilter: add and use nf_fwd_netdev_egress

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... so we can use current skb instead of working with a clone.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2016-11-28 11:40:06 +01:00 committed by Pablo Neira Ayuso
parent df122f58b8
commit 3bf3276119
3 changed files with 28 additions and 10 deletions
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1
include/net/netfilter/nf_dup_netdev.h
View File

@ -2,5 +2,6 @@
#define _NF_DUP_NETDEV_H_
void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif);
void nf_fwd_netdev_egress(const struct nft_pktinfo *pkt, int oif);
#endif

33
net/netfilter/nf_dup_netdev.c
View File

@ -14,6 +14,29 @@
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
static void nf_do_netdev_egress(struct sk_buff *skb, struct net_device *dev)
{
if (skb_mac_header_was_set(skb))
skb_push(skb, skb->mac_len);
skb->dev = dev;
dev_queue_xmit(skb);
}
void nf_fwd_netdev_egress(const struct nft_pktinfo *pkt, int oif)
{
struct net_device *dev;
dev = dev_get_by_index_rcu(nft_net(pkt), oif);
if (!dev) {
kfree_skb(pkt->skb);
return;
}
nf_do_netdev_egress(pkt->skb, dev);
}
EXPORT_SYMBOL_GPL(nf_fwd_netdev_egress);
void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif)
{
struct net_device *dev;
@ -24,14 +47,8 @@ void nf_dup_netdev_egress(const struct nft_pktinfo *pkt, int oif)
return;
skb = skb_clone(pkt->skb, GFP_ATOMIC);
if (skb == NULL)
return;
if (skb_mac_header_was_set(skb))
skb_push(skb, skb->mac_len);
skb->dev = dev;
dev_queue_xmit(skb);
if (skb)
nf_do_netdev_egress(skb, dev);
}
EXPORT_SYMBOL_GPL(nf_dup_netdev_egress);

4
net/netfilter/nft_fwd_netdev.c
View File

@ -26,8 +26,8 @@ static void nft_fwd_netdev_eval(const struct nft_expr *expr,
struct nft_fwd_netdev *priv = nft_expr_priv(expr);
int oif = regs->data[priv->sreg_dev];
nf_dup_netdev_egress(pkt, oif);
regs->verdict.code = NF_DROP;
nf_fwd_netdev_egress(pkt, oif);
regs->verdict.code = NF_STOLEN;
}
static const struct nla_policy nft_fwd_netdev_policy[NFTA_FWD_MAX + 1] = {