net: Save software checksum complete

In skb_checksum complete, if we need to compute the checksum for the
packet (via skb_checksum) save the result as CHECKSUM_COMPLETE.
Subsequent checksum verification can use this.

Also, added csum_complete_sw flag to distinguish between software and
hardware generated checksum complete, we should always be able to trust
the software computation.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 72a53805858a..5b5cd3189c98 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -573,7 +573,8 @@ struct sk_buff {
         __u8                    encapsulation:1;
         __u8                    encap_hdr_csum:1;
         __u8                    csum_valid:1;
-        /* 4/6 bit hole (depending on ndisc_nodetype presence) */
+        __u8                    csum_complete_sw:1;
+        /* 3/5 bit hole (depending on ndisc_nodetype presence) */
         kmemcheck_bitfield_end(flags2);
 
 #if defined CONFIG_NET_DMA || defined CONFIG_NET_RX_BUSY_POLL