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net: vlan: Add parse protocol header ops 

Add parse protocol header ops for vlan device. Before this patch, vlan
tagged packet transmitted by af_packet had skb->protocol unset. Some
kernel methods (like __skb_flow_dissect()) rely on this missing information
for its packet processing.

Signed-off-by: Eran Ben Elisha <eranbe@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eran Ben Elisha 2021-01-12 21:07:12 +02:00 committed by Jakub Kicinski
parent e3a7670737
commit 7185425582
1 changed files with 9 additions and 0 deletions
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9
net/8021q/vlan_dev.c
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@ -510,9 +510,17 @@ static void vlan_dev_set_lockdep_class(struct net_device *dev)
netdev_for_each_tx_queue(dev, vlan_dev_set_lockdep_one, NULL);
}
static __be16 vlan_parse_protocol(const struct sk_buff *skb)
{
struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
return __vlan_get_protocol(skb, veth->h_vlan_proto, NULL);
}
static const struct header_ops vlan_header_ops = {
.create = vlan_dev_hard_header,
.parse = eth_header_parse,
.parse_protocol = vlan_parse_protocol,
};
static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev,
@ -532,6 +540,7 @@ static int vlan_passthru_hard_header(struct sk_buff *skb, struct net_device *dev
static const struct header_ops vlan_passthru_header_ops = {
.create = vlan_passthru_hard_header,
.parse = eth_header_parse,
.parse_protocol = vlan_parse_protocol,
};
static struct device_type vlan_type = {