From 9daabea159a03efb42048736e7b437d4d8700df1 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Mon, 5 Nov 2018 01:28:11 +0100
Subject: compat: csum_levels is new in 3.18 but backported to RHEL

---
 src/compat/compat.h | 1 +
 src/receive.c       | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/src/compat/compat.h b/src/compat/compat.h
index 6223f9d..c4b20ae 100644
--- a/src/compat/compat.h
+++ b/src/compat/compat.h
@@ -149,6 +149,7 @@ static inline void netif_keep_dst(struct net_device *dev)
 {
 	dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
 }
+#define COMPAT_CANNOT_USE_CSUM_LEVEL
 #endif
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0) && !defined(ISRHEL7)
diff --git a/src/receive.c b/src/receive.c
index 81140e9..5417ab9 100644
--- a/src/receive.c
+++ b/src/receive.c
@@ -386,7 +386,9 @@ static void wg_packet_consume_data_done(struct wg_peer *peer,
 	 * again in software.
 	 */
 	skb->ip_summed = CHECKSUM_UNNECESSARY;
+#ifndef COMPAT_CANNOT_USE_CSUM_LEVEL
 	skb->csum_level = ~0; /* All levels */
+#endif
 	skb->protocol = wg_skb_examine_untrusted_ip_hdr(skb);
 	if (skb->protocol == htons(ETH_P_IP)) {
 		len = ntohs(ip_hdr(skb)->tot_len);
-- 
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