From 1e7098b90569243fe7d8f63c402fd45017a8d8db Mon Sep 17 00:00:00 2001 From: David Ahern Date: Tue, 22 Sep 2020 10:14:40 +0800 Subject: [PATCH] vrf: Check skb for XFRM_TRANSFORMED flag stable inclusion from linux-4.19.119 commit c39723ccc47d6454df44e1d1cf8af1d31abc2be4 -------------------------------- [ 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 Signed-off-by: David Ahern Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman Signed-off-by: Yang Yingliang Signed-off-by: Li Aichun Reviewed-by: guodeqing Signed-off-by: Yang Yingliang --- drivers/net/vrf.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c index 3ff7d85e6c02..7e677182691b 100644 --- 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); -- GitLab