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>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index e13ed90..ec89301 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1854,6 +1854,18 @@
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