datapath: Fix pop_vlan().

[sliver-openvswitch.git] / datapath / linux / compat / include / linux / if_vlan.h

diff --git a/datapath/linux/compat/include/linux/if_vlan.h b/datapath/linux/compat/include/linux/if_vlan.h
index f418407..326abb2 100644 (file)
--- a/datapath/linux/compat/include/linux/if_vlan.h
+++ b/datapath/linux/compat/include/linux/if_vlan.h
@@ -54,4 +54,38 @@ static inline struct sk_buff *__vlan_put_tag(struct sk_buff *skb, u16 vlan_tci)
 #define VLAN_TAG_PRESENT       VLAN_CFI_MASK
 #endif
 
+/* This function is not exported from kernel. OVS Upstreaming patch will
+ * fix that. */
+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);
+}
 #endif /* linux/if_vlan.h wrapper */