1 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 8b2256e880e0..0259b719bebf 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -307,6 +307,13 @@ enum {
         SKB_GSO_TCPV6 = 1 << 4,
 
         SKB_GSO_FCOE = 1 << 5,
+
+        /* This indicates at least one fragment might be overwritten
+         * (as in vmsplice(), sendfile() ...)
+         * If we need to compute a TX checksum, we'll need to copy
+         * all frags to avoid possible bad checksum
+         */
+        SKB_GSO_SHARED_FRAG = 1 << 6,
 };
 
 #if BITS_PER_LONG > 32
@@ -2201,6 +2208,18 @@ static inline int skb_linearize(struct sk_buff *skb)
 }
 
 /**
+ * skb_has_shared_frag - can any frag be overwritten
+ * @skb: buffer to test
+ *
+ * Return true if the skb has at least one frag that might be modified
+ * by an external entity (as in vmsplice()/sendfile())
+ */
+static inline bool skb_has_shared_frag(const struct sk_buff *skb)
+{
+        return skb_shinfo(skb)->gso_type & SKB_GSO_SHARED_FRAG;
+}
+
+/**
  *      skb_linearize_cow - make sure skb is linear and writable
  *      @skb: buffer to process
  *