diff options
| -rw-r--r-- | net/ipv4/ip_tunnel_core.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c index afd6b5968caf..9d847c302551 100644 --- a/net/ipv4/ip_tunnel_core.c +++ b/net/ipv4/ip_tunnel_core.c @@ -63,6 +63,7 @@ void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, int pkt_len = skb->len - skb_inner_network_offset(skb); struct net *net = dev_net(rt->dst.dev); struct net_device *dev = skb->dev; + int skb_iif = skb->skb_iif; struct iphdr *iph; int err; @@ -72,6 +73,14 @@ void iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb, skb_dst_set(skb, &rt->dst); memset(IPCB(skb), 0, sizeof(*IPCB(skb))); + if (skb_iif && proto == IPPROTO_UDP) { + /* Arrived from an ingress interface and got udp encapuslated. + * The encapsulated network segment length may exceed dst mtu. + * Allow IP Fragmentation of segments. + */ + IPCB(skb)->flags |= IPSKB_FRAG_SEGS; + } + /* Push down and install the IP header. */ skb_push(skb, sizeof(struct iphdr)); skb_reset_network_header(skb); |