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| author | Cong Wang <amwang@redhat.com> | 2013-02-21 23:32:27 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-02-23 21:00:06 -0500 |
| commit | da8c87241c26aac81a64c7e4d21d438a33018f4e (patch) | |
| tree | ff2224eaeac133a20ce0ab7f128d386a8216c4b3 | |
| parent | 8e904550d0fffcda2b18d7ab12750b0c75757e89 (diff) | |
| download | linux-da8c87241c26aac81a64c7e4d21d438a33018f4e.tar.gz linux-da8c87241c26aac81a64c7e4d21d438a33018f4e.tar.bz2 linux-da8c87241c26aac81a64c7e4d21d438a33018f4e.zip | |
vlan: adjust vlan_set_encap_proto() for its callers
There are two places to call vlan_set_encap_proto():
vlan_untag() and __pop_vlan_tci().
vlan_untag() assumes skb->data points after mac addr, otherwise
the following code
vhdr = (struct vlan_hdr *) skb->data;
vlan_tci = ntohs(vhdr->h_vlan_TCI);
__vlan_hwaccel_put_tag(skb, vlan_tci);
skb_pull_rcsum(skb, VLAN_HLEN);
won't be correct. But __pop_vlan_tci() assumes points _before_
mac addr.
In vlan_set_encap_proto(), it looks for some magic L2 value
after mac addr:
rawp = skb->data;
if (*(unsigned short *) rawp == 0xFFFF)
...
Therefore __pop_vlan_tci() is obviously wrong.
A quick fix is avoiding using skb->data in vlan_set_encap_proto(),
use 'vhdr+1' is always correct in both cases.
Cc: David S. Miller <davem@davemloft.net>
Cc: Jesse Gross <jesse@nicira.com>
Signed-off-by: Cong Wang <amwang@redhat.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/if_vlan.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h index d06cc5c8f58c..218a3b686d90 100644 --- a/include/linux/if_vlan.h +++ b/include/linux/if_vlan.h @@ -331,7 +331,7 @@ static inline void vlan_set_encap_proto(struct sk_buff *skb, struct vlan_hdr *vhdr) { __be16 proto; - unsigned char *rawp; + unsigned short *rawp; /* * Was a VLAN packet, grab the encapsulated protocol, which the layer @@ -344,8 +344,8 @@ static inline void vlan_set_encap_proto(struct sk_buff *skb, return; } - rawp = skb->data; - if (*(unsigned short *) rawp == 0xFFFF) + rawp = (unsigned short *)(vhdr + 1); + if (*rawp == 0xFFFF) /* * This is a magic hack to spot IPX packets. Older Novell * breaks the protocol design and runs IPX over 802.3 without |