[PATCH net-next v11 1/6] net: introduce skb_transport_header_was_set()

This helper resets the mac_header of an skb to a state where
skb_transport_header_was_set() will return false.

This is intended to be used with packets received on
ARPHRD_NONE devices without an Ethernet header in the inner packet.
It allows skb_transport_header_was_set to be subsequently used to
differentiate such packets from those with an Ethernet header.

Signed-off-by: Simon Horman <redacted>
---
v11
* New patch
---
 include/linux/skbuff.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 638b0e004310..669d63b038f6 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h

@@ -2170,6 +2170,11 @@ static inline void skb_reset_mac_header(struct sk_buff *skb)
 	skb->mac_header = skb->data - skb->head;
 }
 
+static inline void skb_unset_mac_header(struct sk_buff *skb)
+{
+	skb->mac_header = (typeof(skb->mac_header))~0U;
+}
+
 static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
 {
 	skb_reset_mac_header(skb);

-- 
2.7.0.rc3.207.g0ac5344

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