vrf: Check skb for XFRM_TRANSFORMED flag

[ Upstream commit 16b9db1ce34ff00d6c18e82825125cfef0cdfb13 ]

To avoid a loop with qdiscs and xfrms, check if the skb has already gone
through the qdisc attached to the VRF device and then to the xfrm layer.
If so, no need for a second redirect.

Fixes: 193125dbd8eb ("net: Introduce VRF device driver")
Reported-by: Trev Larock <trev@larock.ca>
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 012c0a27a6e188e891fad8980ca791660ce0db23..b55eeb8f8fa3a56fb945acad1b7eac7b03649191 100644 (file)
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -478,7 +478,8 @@ static struct sk_buff *vrf_ip6_out(struct net_device *vrf_dev,
        if (rt6_need_strict(&ipv6_hdr(skb)->daddr))
                return skb;
 
-       if (qdisc_tx_is_default(vrf_dev))
+       if (qdisc_tx_is_default(vrf_dev) ||
+           IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
                return vrf_ip6_out_direct(vrf_dev, sk, skb);
 
        return vrf_ip6_out_redirect(vrf_dev, skb);
@@ -692,7 +693,8 @@ static struct sk_buff *vrf_ip_out(struct net_device *vrf_dev,
            ipv4_is_lbcast(ip_hdr(skb)->daddr))
                return skb;
 
-       if (qdisc_tx_is_default(vrf_dev))
+       if (qdisc_tx_is_default(vrf_dev) ||
+           IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
                return vrf_ip_out_direct(vrf_dev, sk, skb);
 
        return vrf_ip_out_redirect(vrf_dev, skb);