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[AF_PACKET]: Add option to return orig_dev to userspace.

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Add a packet socket option to allow the orig_dev index to be returned
to userspace when passing traffic through a decapsulated device, such
as the bonding driver.

This is very useful for layer 2 traffic being able to report which
physical device actually received the traffic, instead of having the
encapsulating device hide that information.

The new option is called PACKET_ORIGDEV.

Signed-off-by: Peter P. Waskiewicz Jr. <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter P. Waskiewicz Jr 2007-04-20 16:05:39 -07:00 committed by David S. Miller
parent 1370b5a59b
commit 80feaacb8a
2 changed files with 30 additions and 3 deletions
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1
include/linux/if_packet.h
View file

@ -42,6 +42,7 @@ struct sockaddr_ll
#define PACKET_STATISTICS 6
#define PACKET_COPY_THRESH 7
#define PACKET_AUXDATA 8
#define PACKET_ORIGDEV 9
struct tpacket_stats
{

32
net/packet/af_packet.c
View file

@ -201,7 +201,8 @@ struct packet_sock {
struct packet_type prot_hook;
spinlock_t bind_lock;
unsigned int running:1, /* prot_hook is attached*/
auxdata:1;
auxdata:1,
origdev:1;
int ifindex; /* bound device */
__be16 num;
#ifdef CONFIG_PACKET_MULTICAST
@ -528,7 +529,10 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev, struct packet
sll->sll_hatype = dev->type;
sll->sll_protocol = skb->protocol;
sll->sll_pkttype = skb->pkt_type;
sll->sll_ifindex = dev->ifindex;
if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST)
sll->sll_ifindex = orig_dev->ifindex;
else
sll->sll_ifindex = dev->ifindex;
sll->sll_halen = 0;
if (dev->hard_header_parse)
@ -673,7 +677,10 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev, struct packe
sll->sll_hatype = dev->type;
sll->sll_protocol = skb->protocol;
sll->sll_pkttype = skb->pkt_type;
sll->sll_ifindex = dev->ifindex;
if (unlikely(po->origdev) && skb->pkt_type == PACKET_HOST)
sll->sll_ifindex = orig_dev->ifindex;
else
sll->sll_ifindex = dev->ifindex;
h->tp_status = status;
smp_mb();
@ -1413,6 +1420,18 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
po->auxdata = !!val;
return 0;
}
case PACKET_ORIGDEV:
{
int val;
if (optlen < sizeof(val))
return -EINVAL;
if (copy_from_user(&val, optval, sizeof(val)))
return -EFAULT;
po->origdev = !!val;
return 0;
}
default:
return -ENOPROTOOPT;
}
@ -1454,6 +1473,13 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
len = sizeof(int);
val = po->auxdata;
data = &val;
break;
case PACKET_ORIGDEV:
if (len > sizeof(int))
len = sizeof(int);
val = po->origdev;
data = &val;
break;
default: