Revert "vrf: mark skb for multicast or link-local as enslaved to VRF"

stable inclusion
from linux-4.19.113
commit ae2f7c84371a2a4c449a92c956d0e4f83565e257

--------------------------------

This reverts commit 91c5f99d131ed3b231aaef7d4ed6799085b095a3.

This patch shouldn't have been backported to 4.19.
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: NLi Aichun <liaichun@huawei.com>
Reviewed-by: Nguodeqing <geffrey.guo@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

drivers/net/vrf.c

@@ -994,23 +994,24 @@ static struct sk_buff *vrf_ip6_rcv(struct net_device *vrf_dev,
 				   struct sk_buff *skb)
 {
 	int orig_iif = skb->skb_iif;
-	bool need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
-	bool is_ndisc = ipv6_ndisc_frame(skb);
+	bool need_strict;
 
-	/* loopback, multicast & non-ND link-local traffic; do not push through
-	 * packet taps again. Reset pkt_type for upper layers to process skb
+	/* loopback traffic; do not push through packet taps again.
+	 * Reset pkt_type for upper layers to process skb
 	 */
-	if (skb->pkt_type == PACKET_LOOPBACK || (need_strict && !is_ndisc)) {
+	if (skb->pkt_type == PACKET_LOOPBACK) {
 		skb->dev = vrf_dev;
 		skb->skb_iif = vrf_dev->ifindex;
 		IP6CB(skb)->flags |= IP6SKB_L3SLAVE;
-		if (skb->pkt_type == PACKET_LOOPBACK)
-			skb->pkt_type = PACKET_HOST;
+		skb->pkt_type = PACKET_HOST;
 		goto out;
 	}
 
-	/* if packet is NDISC then keep the ingress interface */
-	if (!is_ndisc) {
+	/* if packet is NDISC or addressed to multicast or link-local
+	 * then keep the ingress interface
+	 */
+	need_strict = rt6_need_strict(&ipv6_hdr(skb)->daddr);
+	if (!ipv6_ndisc_frame(skb) && !need_strict) {
 		vrf_rx_stats(vrf_dev, skb->len);
 		skb->dev = vrf_dev;
 		skb->skb_iif = vrf_dev->ifindex;