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[VLAN]: Move protocol determination to seperate function

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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>
This commit is contained in:
Pavel Emelyanov 2008-01-21 00:28:03 -08:00 committed by David S. Miller
parent 31ffdbcb59
commit 91b4f95475
1 changed files with 35 additions and 28 deletions
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63
net/8021q/vlan_dev.c
View file

@ -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;
}
vlan_set_encap_proto(skb, vhdr);
/*
* 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);
recv:
skb = vlan_check_reorder_header(skb);
if (!skb) {
stats->rx_errors++;