netdev - [PATCH net-next v11 1/6] net: introduce skb_transport_header_was

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Message-Id: <1467827996-32547-2-git-send-email-simon.horman@netronome.com>
Date:	Wed,  6 Jul 2016 19:59:51 +0200
From:	Simon Horman <simon.horman@...ronome.com>
To:	netdev@...r.kernel.org
Cc:	dev@...nvswitch.org
Subject: [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 <simon.horman@...ronome.com>
---
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