net/skbuff: add macros for VLAN_PRESENT bit

Wrap VLAN_PRESENT bit using macro like PKT_TYPE_* and CLONED_*,
as used by BPF code.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 7dcfb55..99f3877 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -816,6 +816,12 @@ struct sk_buff {
        __u32                   priority;
        int                     skb_iif;
        __u32                   hash;
+#define PKT_VLAN_PRESENT_BIT   4       // CFI (12-th bit) in TCI
+#ifdef __BIG_ENDIAN
+#define PKT_VLAN_PRESENT_OFFSET()      offsetof(struct sk_buff, vlan_tci)
+#else
+#define PKT_VLAN_PRESENT_OFFSET()      (offsetof(struct sk_buff, vlan_tci) + 1)
+#endif
        __be16                  vlan_proto;
        __u16                   vlan_tci;
 #if defined(CONFIG_NET_RX_BUSY_POLL) || defined(CONFIG_XPS)