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authorPeter P. Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>2007-04-20 16:05:39 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-04-25 22:29:14 -0700
commit80feaacb8a6400a9540a961b6743c69a5896b937 (patch)
treea4f07e635de521f5e283e0f4081923a98c0256d5
parent1370b5a59b941ac3873b5e8614d496e9f481d670 (diff)
downloadkernel-80feaacb8a6400a9540a961b6743c69a5896b937.tar.gz
[AF_PACKET]: Add option to return orig_dev to userspace.
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>
-rw-r--r--include/linux/if_packet.h1
-rw-r--r--net/packet/af_packet.c32
2 files changed, 30 insertions, 3 deletions
diff --git a/include/linux/if_packet.h b/include/linux/if_packet.h
index f3de05c30678..ad09609227ff 100644
--- a/include/linux/if_packet.h
+++ b/include/linux/if_packet.h
@@ -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
{
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 36388b2f32f9..02e401cd683f 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -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;
}
@@ -1456,6 +1475,13 @@ static int packet_getsockopt(struct socket *sock, int level, int optname,
data = &val;
break;
+ case PACKET_ORIGDEV:
+ if (len > sizeof(int))
+ len = sizeof(int);
+ val = po->origdev;
+
+ data = &val;
+ break;
default:
return -ENOPROTOOPT;
}