From f0319886caef01c41aaebbdf6c7dd8312a2ce085 Mon Sep 17 00:00:00 2001
From: Wei Hu <whu@FreeBSD.org>
Date: Mon, 22 Oct 2018 11:23:51 +0000
Subject: [PATCH] Do not trop UDP traffic when TXCSUM_IPV6 flag is on

PR:		231797
Submitted by:	whu
Reviewed by:	dexuan
Obtained from:	Kevin Morse
MFC after:	3 days
Sponsored by:	Microsoft
Differential Revision:	https://bugs.freebsd.org/bugzilla/attachment.cgi?id=198333&action=diff
---
 sys/dev/hyperv/netvsc/if_hn.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/dev/hyperv/netvsc/if_hn.c b/sys/dev/hyperv/netvsc/if_hn.c
index 24335638c33..d2eaa711dcb 100644
--- a/sys/dev/hyperv/netvsc/if_hn.c
+++ b/sys/dev/hyperv/netvsc/if_hn.c
@@ -861,7 +861,8 @@ hn_set_hlen(struct mbuf *m_head)
 
 		PULLUP_HDR(m_head, ehlen + sizeof(*ip6));
 		ip6 = mtodo(m_head, ehlen);
-		if (ip6->ip6_nxt != IPPROTO_TCP) {
+		if (ip6->ip6_nxt != IPPROTO_TCP &&
+		    ip6->ip6_nxt != IPPROTO_UDP) {
 			m_freem(m_head);
 			return (NULL);
 		}