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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>
This commit is contained in:
Tom Herbert 2015-04-20 14:10:04 -07:00 committed by David S. Miller
parent a068833bbf
commit 4e18b9adf2
1 changed files with 12 additions and 0 deletions
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12
include/linux/skbuff.h
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@ -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: