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authorPravin B Shelar <pshelar@nicira.com>2011-11-18 13:15:54 -0800
committerJesse Gross <jesse@nicira.com>2011-12-03 09:35:09 -0800
commit396cf9430505cfba529a2f2a037d782719fa5844 (patch)
treed628b40d09c5e608d1bd41ac14f64774c8fddf10 /include/linux/if_vlan.h
parentb4e16611c4e1cd98765269c8fdaf43f96baa57b1 (diff)
downloadlwn-396cf9430505cfba529a2f2a037d782719fa5844.tar.gz
lwn-396cf9430505cfba529a2f2a037d782719fa5844.zip
vlan: Move vlan_set_encap_proto() to vlan header file
Open vSwitch needs this function for vlan handling. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: Jesse Gross <jesse@nicira.com>
Diffstat (limited to 'include/linux/if_vlan.h')
-rw-r--r--include/linux/if_vlan.h34
1 files changed, 34 insertions, 0 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 12d5543b14f2..070ac50c1d2d 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -310,6 +310,40 @@ static inline __be16 vlan_get_protocol(const struct sk_buff *skb)
return protocol;
}
+
+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 /* __KERNEL__ */
/* VLAN IOCTLs are found in sockios.h */