[PATCH v4 net-next 08/11] net: Add VLAN ID to flow_keys

[Tom Herbert]

In flow_dissector set vlan_id in flow_keys when VLAN is found.

Signed-off-by: Tom Herbert <t...@herbertland.com>
---
 include/net/flow_dissector.h |  6 ++++++
 net/core/flow_dissector.c    | 14 ++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/include/net/flow_dissector.h b/include/net/flow_dissector.h
index 59f00f9..08480fb 100644
--- a/include/net/flow_dissector.h
+++ b/include/net/flow_dissector.h
@@ -27,6 +27,10 @@ struct flow_dissector_key_basic {
        u8      padding;
 };
 
+struct flow_dissector_key_tags {
+       u32     vlan_id:12;
+};
+
 /**
  * struct flow_dissector_key_ipv4_addrs:
  * @src: source ip address
@@ -106,6 +110,7 @@ enum flow_dissector_key_id {
        FLOW_DISSECTOR_KEY_PORTS, /* struct flow_dissector_key_ports */
        FLOW_DISSECTOR_KEY_ETH_ADDRS, /* struct flow_dissector_key_eth_addrs */
        FLOW_DISSECTOR_KEY_TIPC_ADDRS, /* struct flow_dissector_key_tipc_addrs 
*/
+       FLOW_DISSECTOR_KEY_VLANID, /* struct flow_dissector_key_flow_tags */
 
        FLOW_DISSECTOR_KEY_MAX,
 };
@@ -142,6 +147,7 @@ struct flow_keys {
        struct flow_dissector_key_control control;
 #define FLOW_KEYS_HASH_START_FIELD basic
        struct flow_dissector_key_basic basic;
+       struct flow_dissector_key_tags tags;
        struct flow_dissector_key_ports ports;
        struct flow_dissector_key_addrs addrs;
 };
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 5348a46..5c66cb2 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -126,6 +126,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
        struct flow_dissector_key_basic *key_basic;
        struct flow_dissector_key_addrs *key_addrs;
        struct flow_dissector_key_ports *key_ports;
+       struct flow_dissector_key_tags *key_tags;
        u8 ip_proto;
 
        if (!data) {
@@ -246,6 +247,15 @@ flow_label:
                if (!vlan)
                        return false;
 
+               if (skb_flow_dissector_uses_key(flow_dissector,
+                                               FLOW_DISSECTOR_KEY_VLANID)) {
+                       key_tags = skb_flow_dissector_target(flow_dissector,
+                                                            
FLOW_DISSECTOR_KEY_VLANID,
+                                                            target_container);
+
+                       key_tags->vlan_id = skb_vlan_tag_get_id(skb);
+               }
+
                proto = vlan->h_vlan_encapsulated_proto;
                nhoff += sizeof(*vlan);
                goto again;
@@ -645,6 +655,10 @@ static const struct flow_dissector_key 
flow_keys_dissector_keys[] = {
                .key_id = FLOW_DISSECTOR_KEY_PORTS,
                .offset = offsetof(struct flow_keys, ports),
        },
+       {
+               .key_id = FLOW_DISSECTOR_KEY_VLANID,
+               .offset = offsetof(struct flow_keys, tags),
+       },
 };
 
 static const struct flow_dissector_key flow_keys_buf_dissector_keys[] = {
-- 
1.8.1

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