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authorPavel Emelyanov <xemul@openvz.org>2008-01-21 00:28:03 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 15:08:35 -0800
commit91b4f954759653272504c55b715b757207ed1700 (patch)
treed494866443c2e2d1faf263e0f184b0d6410f3d3d /net
parent31ffdbcb5989c121f2f81a6b5b20c1c4bb21e5fd (diff)
[VLAN]: Move protocol determination to seperate function
I think, that we can make this code flow easier to understand by introducing the vlan_set_encap_proto() function (I hope the name is good) to setup the skb proto and merge the paths calling netif_rx() together. [Patrick: Modified to apply on top of my previous patches] Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/8021q/vlan_dev.c63
1 files changed, 35 insertions, 28 deletions
diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
index 57799af5108..8059fa42b08 100644
--- a/net/8021q/vlan_dev.c
+++ b/net/8021q/vlan_dev.c
@@ -89,6 +89,40 @@ static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
return skb;
}
+static inline void vlan_set_encap_proto(struct sk_buff *skb,
+ struct vlan_hdr *vhdr)
+{
+ __be16 proto;
+ unsigned char *rawp;
+
+ /*
+ * Was a VLAN packet, grab the encapsulated protocol, which the layer
+ * three protocols care about.
+ */
+
+ proto = vhdr->h_vlan_encapsulated_proto;
+ if (ntohs(proto) >= 1536) {
+ skb->protocol = proto;
+ return;
+ }
+
+ rawp = skb->data;
+ if (*(unsigned short *)rawp == 0xFFFF)
+ /*
+ * This is a magic hack to spot IPX packets. Older Novell
+ * breaks the protocol design and runs IPX over 802.3 without
+ * an 802.2 LLC layer. We look for FFFF which isn't a used
+ * 802.2 SSAP/DSAP. This won't work for fault tolerant netware
+ * but does for the rest.
+ */
+ skb->protocol = htons(ETH_P_802_3);
+ else
+ /*
+ * Real 802.2 LLC
+ */
+ skb->protocol = htons(ETH_P_802_2);
+}
+
/*
* Determine the packet's protocol ID. The rule here is that we
* assume 802.3 if the type field is short enough to be a length.
@@ -114,12 +148,10 @@ static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *ptype, struct net_device *orig_dev)
{
- unsigned char *rawp;
struct vlan_hdr *vhdr;
unsigned short vid;
struct net_device_stats *stats;
unsigned short vlan_TCI;
- __be16 proto;
if (dev->nd_net != &init_net)
goto err_free;
@@ -179,33 +211,8 @@ int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
break;
}
- /* Was a VLAN packet, grab the encapsulated protocol, which the layer
- * three protocols care about.
- */
- proto = vhdr->h_vlan_encapsulated_proto;
- if (ntohs(proto) >= 1536) {
- skb->protocol = proto;
- goto recv;
- }
-
- /*
- * This is a magic hack to spot IPX packets. Older Novell breaks
- * the protocol design and runs IPX over 802.3 without an 802.2 LLC
- * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
- * won't work for fault tolerant netware but does for the rest.
- */
- rawp = skb->data;
- if (*(unsigned short *)rawp == 0xFFFF) {
- skb->protocol = htons(ETH_P_802_3);
- goto recv;
- }
-
- /*
- * Real 802.2 LLC
- */
- skb->protocol = htons(ETH_P_802_2);
+ vlan_set_encap_proto(skb, vhdr);
-recv:
skb = vlan_check_reorder_header(skb);
if (!skb) {
stats->rx_errors++;