net: add skb_pop_rcv_encapsulation (e5eb4e30) · Commits · 戴 / test

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:

Tom Herbert <therbert@google.com> Signed-off-by:

David S. Miller <davem@davemloft.net>

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

Admin message