1 files changed, 6 insertions, 2 deletions

diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index af2392ae5769..66620a95942a 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -33,6 +33,7 @@ static void xfrm4_encap(struct sk_buff *skb)
         struct dst_entry *dst = skb->dst;
         struct xfrm_state *x = dst->xfrm;
         struct iphdr *iph, *top_iph;
+        int flags;
 
         iph = skb->nh.iph;
         skb->h.ipiph = iph;
@@ -51,10 +52,13 @@ static void xfrm4_encap(struct sk_buff *skb)
 
         /* DS disclosed */
         top_iph->tos = INET_ECN_encapsulate(iph->tos, iph->tos);
-        if (x->props.flags & XFRM_STATE_NOECN)
+
+        flags = x->props.flags;
+        if (flags & XFRM_STATE_NOECN)
                 IP_ECN_clear(top_iph);
 
-        top_iph->frag_off = iph->frag_off & htons(IP_DF);
+        top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
+                0 : (iph->frag_off & htons(IP_DF));
         if (!top_iph->frag_off)
                 __ip_select_ident(top_iph, dst, 0);