net/flow_dissector: Add support for QinQ dissection
Dissect the QinQ packets to get both outer and inner vlan information,
then store to the extended flow keys.
Signed-off-by: Jianbo Liu <jianbol@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 18cb99b..b555fc2 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -589,7 +589,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
struct flow_dissector_key_tags *key_tags;
struct flow_dissector_key_vlan *key_vlan;
enum flow_dissect_ret fdret;
- bool skip_vlan = false;
+ enum flow_dissector_key_id dissector_vlan = FLOW_DISSECTOR_KEY_MAX;
int num_hdrs = 0;
u8 ip_proto = 0;
bool ret;
@@ -748,15 +748,14 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
}
case htons(ETH_P_8021AD):
case htons(ETH_P_8021Q): {
- const struct vlan_hdr *vlan;
+ const struct vlan_hdr *vlan = NULL;
struct vlan_hdr _vlan;
- bool vlan_tag_present = skb && skb_vlan_tag_present(skb);
__be16 saved_vlan_tpid = proto;
- if (vlan_tag_present)
+ if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX &&
+ skb && skb_vlan_tag_present(skb)) {
proto = skb->protocol;
-
- if (!vlan_tag_present || eth_type_vlan(skb->protocol)) {
+ } else {
vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan),
data, hlen, &_vlan);
if (!vlan) {
@@ -766,20 +765,23 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
proto = vlan->h_vlan_encapsulated_proto;
nhoff += sizeof(*vlan);
- if (skip_vlan) {
- fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
- break;
- }
}
- skip_vlan = true;
- if (dissector_uses_key(flow_dissector,
- FLOW_DISSECTOR_KEY_VLAN)) {
+ if (dissector_vlan == FLOW_DISSECTOR_KEY_MAX) {
+ dissector_vlan = FLOW_DISSECTOR_KEY_VLAN;
+ } else if (dissector_vlan == FLOW_DISSECTOR_KEY_VLAN) {
+ dissector_vlan = FLOW_DISSECTOR_KEY_CVLAN;
+ } else {
+ fdret = FLOW_DISSECT_RET_PROTO_AGAIN;
+ break;
+ }
+
+ if (dissector_uses_key(flow_dissector, dissector_vlan)) {
key_vlan = skb_flow_dissector_target(flow_dissector,
- FLOW_DISSECTOR_KEY_VLAN,
+ dissector_vlan,
target_container);
- if (vlan_tag_present) {
+ if (!vlan) {
key_vlan->vlan_id = skb_vlan_tag_get_id(skb);
key_vlan->vlan_priority =
(skb_vlan_tag_get_prio(skb) >> VLAN_PRIO_SHIFT);
