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Commit 24c590e3 authored by Jianbo Liu's avatar Jianbo Liu Committed by David S. Miller
Browse files

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: default avatarJianbo Liu <jianbol@mellanox.com>
Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aaab0834

include/net/flow_dissector.h

+2 −0
Original line number Diff line number Diff line
@@ -206,6 +206,7 @@ enum flow_dissector_key_id { 
	FLOW_DISSECTOR_KEY_MPLS, /* struct flow_dissector_key_mpls */

	FLOW_DISSECTOR_KEY_TCP, /* struct flow_dissector_key_tcp */

	FLOW_DISSECTOR_KEY_IP, /* struct flow_dissector_key_ip */

	FLOW_DISSECTOR_KEY_CVLAN, /* struct flow_dissector_key_flow_vlan */



	FLOW_DISSECTOR_KEY_MAX,

};
@@ -237,6 +238,7 @@ struct flow_keys { 
	struct flow_dissector_key_basic basic;

	struct flow_dissector_key_tags tags;

	struct flow_dissector_key_vlan vlan;

	struct flow_dissector_key_vlan cvlan;

	struct flow_dissector_key_keyid keyid;

	struct flow_dissector_key_ports ports;

	struct flow_dissector_key_addrs addrs;

net/core/flow_dissector.c

+17 −15
Original line number Diff line number Diff line
@@ -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) {

		}



		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;

		}

		}



		skip_vlan = true;

		if (dissector_uses_key(flow_dissector,

				       FLOW_DISSECTOR_KEY_VLAN)) {

		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);