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arp: Inherit metadata dst when creating ARP requests

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If output device wants to see the dst, inherit the dst of the
original skb and pass it on to generate the ARP request.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2015-07-21 10:43:57 +02:00 committed by David S. Miller
parent f38a9eb1f7
commit 0accfc268f
1 changed files with 37 additions and 28 deletions
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65
net/ipv4/arp.c
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@ -291,6 +291,40 @@ static void arp_error_report(struct neighbour *neigh, struct sk_buff *skb)
kfree_skb(skb);
}
/* Create and send an arp packet. */
static void arp_send_dst(int type, int ptype, __be32 dest_ip,
struct net_device *dev, __be32 src_ip,
const unsigned char *dest_hw,
const unsigned char *src_hw,
const unsigned char *target_hw, struct sk_buff *oskb)
{
struct sk_buff *skb;
/* arp on this interface. */
if (dev->flags & IFF_NOARP)
return;
skb = arp_create(type, ptype, dest_ip, dev, src_ip,
dest_hw, src_hw, target_hw);
if (!skb)
return;
if (oskb)
skb_dst_copy(skb, oskb);
arp_xmit(skb);
}
void arp_send(int type, int ptype, __be32 dest_ip,
struct net_device *dev, __be32 src_ip,
const unsigned char *dest_hw, const unsigned char *src_hw,
const unsigned char *target_hw)
{
arp_send_dst(type, ptype, dest_ip, dev, src_ip, dest_hw, src_hw,
target_hw, NULL);
}
EXPORT_SYMBOL(arp_send);
static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
{
__be32 saddr = 0;
@ -346,8 +380,9 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
}
}
arp_send(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr,
dst_hw, dev->dev_addr, NULL);
arp_send_dst(ARPOP_REQUEST, ETH_P_ARP, target, dev, saddr,
dst_hw, dev->dev_addr, NULL,
dev->priv_flags & IFF_XMIT_DST_RELEASE ? NULL : skb);
}
static int arp_ignore(struct in_device *in_dev, __be32 sip, __be32 tip)
@ -596,32 +631,6 @@ void arp_xmit(struct sk_buff *skb)
}
EXPORT_SYMBOL(arp_xmit);
/*
* Create and send an arp packet.
*/
void arp_send(int type, int ptype, __be32 dest_ip,
struct net_device *dev, __be32 src_ip,
const unsigned char *dest_hw, const unsigned char *src_hw,
const unsigned char *target_hw)
{
struct sk_buff *skb;
/*
* No arp on this interface.
*/
if (dev->flags&IFF_NOARP)
return;
skb = arp_create(type, ptype, dest_ip, dev, src_ip,
dest_hw, src_hw, target_hw);
if (!skb)
return;
arp_xmit(skb);
}
EXPORT_SYMBOL(arp_send);
/*
* Process an arp request.
*/