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authorTom Herbert <therbert@google.com>2014-06-14 23:24:28 -0700
committerDavid S. Miller <davem@davemloft.net>2014-06-15 01:00:50 -0700
commite5eb4e30a51236079fb22bb9f75fcd31915b03c6 (patch)
tree8ad2ebd487bfd56a49f680061c078dff2f196af2
parentbbdff225ede6527f91184b2a7903df8aad803ace (diff)
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: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/skbuff.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index e13ed90be7c2..ec89301ada41 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -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

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