From 4e18b9adf2f910ec4d30b811a74a5b626e6c6125 Mon Sep 17 00:00:00 2001
From: Tom Herbert <tom@herbertland.com>
Date: Mon, 20 Apr 2015 14:10:04 -0700
Subject: [PATCH] net: add skb_checksum_complete_unset
This function changes ip_summed to CHECKSUM_NONE if CHECKSUM_COMPLETE
is set. This is called to discard checksum-complete when packet
is being modified and checksum is not pulled for headers in a layer.
Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/linux/skbuff.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 0991259643d6e..06793b598f448 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3016,6 +3016,18 @@ static inline bool __skb_checksum_validate_needed(struct sk_buff *skb,
*/
#define CHECKSUM_BREAK 76
+/* Unset checksum-complete
+ *
+ * Unset checksum complete can be done when packet is being modified
+ * (uncompressed for instance) and checksum-complete value is
+ * invalidated.
+ */
+static inline void skb_checksum_complete_unset(struct sk_buff *skb)
+{
+ if (skb->ip_summed == CHECKSUM_COMPLETE)
+ skb->ip_summed = CHECKSUM_NONE;
+}
+
/* Validate (init) checksum based on checksum complete.
*
* Return values: