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Commit e5eb4e30 authored by Tom Herbert's avatar Tom Herbert Committed by David S. Miller
Browse files

net: add skb_pop_rcv_encapsulation 



This function is used by UDP encapsulation protocols in RX when
crossing encapsulation boundary. If ip_summed is set to
CHECKSUM_UNNECESSARY and encapsulation is not set, change to
CHECKSUM_NONE since the checksum has not been validated within the
encapsulation. Clears csum_valid by the same rationale.

Signed-off-by: default avatarTom Herbert <therbert@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bbdff225

include/linux/skbuff.h

+12 −0
Original line number Diff line number Diff line
@@ -1854,6 +1854,18 @@ static inline int pskb_network_may_pull(struct sk_buff *skb, unsigned int len) 
	return pskb_may_pull(skb, skb_network_offset(skb) + len);

}



static inline void skb_pop_rcv_encapsulation(struct sk_buff *skb)

{

	/* Only continue with checksum unnecessary if device indicated

	 * it is valid across encapsulation (skb->encapsulation was set).

	 */

	if (skb->ip_summed == CHECKSUM_UNNECESSARY && !skb->encapsulation)

		skb->ip_summed = CHECKSUM_NONE;



	skb->encapsulation = 0;

	skb->csum_valid = 0;

}



/*

 * CPUs often take a performance hit when accessing unaligned memory

 * locations. The actual performance hit varies, it can be small if the