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openvswitch: fix vport packet length check.

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When sending a packet to a tunnel device, the dev's hard_header_len
could be larger than the skb->len in function packet_length().
In the case of ip6gretap/erspan, hard_header_len = LL_MAX_HEADER + t_hlen,
which is around 180, and an ARP packet sent to this tunnel has
skb->len = 42.  This causes the 'unsign int length' to become super
large because it is negative value, causing the later ovs_vport_send
to drop it due to over-mtu size.  The patch fixes it by setting it to 0.

Signed-off-by: William Tu <u9012063@gmail.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
William Tu 2018-03-07 15:38:48 -08:00 committed by David S. Miller
parent 55a165a77c
commit 46e371f0e7
1 changed files with 4 additions and 4 deletions
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8
net/openvswitch/vport.c
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@ -464,10 +464,10 @@ int ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
return 0;
}
static unsigned int packet_length(const struct sk_buff *skb,
struct net_device *dev)
static int packet_length(const struct sk_buff *skb,
struct net_device *dev)
{
unsigned int length = skb->len - dev->hard_header_len;
int length = skb->len - dev->hard_header_len;
if (!skb_vlan_tag_present(skb) &&
eth_type_vlan(skb->protocol))
@ -478,7 +478,7 @@ static unsigned int packet_length(const struct sk_buff *skb,
* account for 802.1ad. e.g. is_skb_forwardable().
*/
return length;
return length > 0 ? length : 0;
}
void ovs_vport_send(struct vport *vport, struct sk_buff *skb, u8 mac_proto)