Subject: [PATCH 04/22] gre6: Fix reception with IP6_TNL_F_RCV_DSCP_COPY

From: Mark Tomlinson <[email-masked]>
Date: Wed, 19 Aug 2020 13:53:58 +1200

[ Upstream commit 272502fcb7cda01ab07fc2fcff82d1d2f73d43cc ]

When receiving an IPv4 packet inside an IPv6 GRE packet, and the
IP6_TNL_F_RCV_DSCP_COPY flag is set on the tunnel, the IPv4 header would
get corrupted. This is due to the common ip6_tnl_rcv() function assuming
that the inner header is always IPv6. This patch checks the tunnel
protocol for IPv4 inner packets, but still defaults to IPv6.

Fixes: 308edfdf1563 ("gre6: Cleanup GREv6 receive path, call common GRE functions")
Signed-off-by: Mark Tomlinson <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 net/ipv6/ip6_tunnel.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 4703b09808d0..84f90b8b8890 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -886,7 +886,15 @@ int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
 		struct metadata_dst *tun_dst,
 		bool log_ecn_err)
 {
-	return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate,
+	int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
+				    const struct ipv6hdr *ipv6h,
+				    struct sk_buff *skb);
+
+	dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate;
+	if (tpi->proto == htons(ETH_P_IP))
+		dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate;
+
+	return __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
 			     log_ecn_err);
 }
 EXPORT_SYMBOL(ip6_tnl_rcv);
-- 
2.26.2