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| author | Pravin B Shelar <pshelar@nicira.com> | 2011-11-18 13:15:54 -0800 |
|---|---|---|
| committer | Jesse Gross <jesse@nicira.com> | 2011-12-03 09:35:09 -0800 |
| commit | 396cf9430505cfba529a2f2a037d782719fa5844 (patch) | |
| tree | d628b40d09c5e608d1bd41ac14f64774c8fddf10 /include/linux/if_vlan.h | |
| parent | b4e16611c4e1cd98765269c8fdaf43f96baa57b1 (diff) | |
| download | lwn-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.h | 34 |
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 */ |