1 files changed, 21 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 2748ff639144..5405dfe02572 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3099,6 +3099,27 @@ do {									\
                                        compute_pseudo(skb, proto));     \
 } while (0)
 
+/* Update skbuf and packet to reflect the remote checksum offload operation.
+ * When called, ptr indicates the starting point for skb->csum when
+ * ip_summed is CHECKSUM_COMPLETE. If we need create checksum complete
+ * here, skb_postpull_rcsum is done so skb->csum start is ptr.
+ */
+static inline void skb_remcsum_process(struct sk_buff *skb, void *ptr,
+                                       int start, int offset)
+{
+        __wsum delta;
+
+         if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE)) {
+                __skb_checksum_complete(skb);
+                skb_postpull_rcsum(skb, skb->data, ptr - (void *)skb->data);
+        }
+
+        delta = remcsum_adjust(ptr, skb->csum, start, offset);
+
+        /* Adjust skb->csum since we changed the packet */
+        skb->csum = csum_add(skb->csum, delta);
+}
+
 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 void nf_conntrack_destroy(struct nf_conntrack *nfct);
 static inline void nf_conntrack_put(struct nf_conntrack *nfct)