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Patch "ipmr: vrf: Find VIFs using the actual device" has been added to the 4.9-stable tree

PATCH [email protected] 1 participant 1 message Apr 9, 2018

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This is a note to let you know that I've just added the patch titled

ipmr: vrf: Find VIFs using the actual device

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ipmr-vrf-find-vifs-using-the-actual-device.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From foo@baz Mon Apr 9 17:09:24 CEST 2018

From: Thomas Winter <[email protected]>
Date: Tue, 16 May 2017 10:14:44 +1200
Subject: ipmr: vrf: Find VIFs using the actual device

From: Thomas Winter <[email protected]>

[ Upstream commit bcfc7d33110b0f33069d74138eeb7ca9acbb3c85 ]

The skb->dev that is passed into ip_mr_input is
the loX device for VRFs. When we lookup a vif
for this dev, none is found as we do not create
vifs for loopbacks. Instead lookup a vif for the
actual device that the packet was received on,
eg the vlan.

Signed-off-by Thomas Winter <[email protected]>
cc David Ahern <[email protected]>
cc Nikolay Aleksandrov <[email protected]>
cc roopa <[email protected]>
Acked-by David Ahern <[email protected]>
Signed-off-by David S. Miller <[email protected]>
Signed-off-by Sasha Levin <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 net/ipv4/ipmr.c |   18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)
net/ipv4/ipmr.c +16 -2
@@ -1929,6 +1929,20 @@ int ip_mr_input(struct sk_buff *skb)
 	struct net *net = dev_net(skb->dev);
 	int local = skb_rtable(skb)->rt_flags & RTCF_LOCAL;
 	struct mr_table *mrt;
+	struct net_device *dev;
+
+	/* skb->dev passed in is the loX master dev for vrfs.
+	 * As there are no vifs associated with loopback devices,
+	 * get the proper interface that does have a vif associated with it.
+	 */
+	dev = skb->dev;
+	if (netif_is_l3_master(skb->dev)) {
+		dev = dev_get_by_index_rcu(net, IPCB(skb)->iif);
+		if (!dev) {
+			kfree_skb(skb);
+			return -ENODEV;
+		}
+	}
 
 	/* Packet is looped back after forward, it should not be
 	 * forwarded second time, but still can be delivered locally.

@@ -1966,7 +1980,7 @@ int ip_mr_input(struct sk_buff *skb)
 	/* already under rcu_read_lock() */
 	cache = ipmr_cache_find(mrt, ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
 	if (!cache) {
-		int vif = ipmr_find_vif(mrt, skb->dev);
+		int vif = ipmr_find_vif(mrt, dev);
 
 		if (vif >= 0)
 			cache = ipmr_cache_find_any(mrt, ip_hdr(skb)->daddr,

@@ -1986,7 +2000,7 @@ int ip_mr_input(struct sk_buff *skb)
 		}
 
 		read_lock(&mrt_lock);
-		vif = ipmr_find_vif(mrt, skb->dev);
+		vif = ipmr_find_vif(mrt, dev);
 		if (vif >= 0) {
 			int err2 = ipmr_cache_unresolved(mrt, vif, skb);
 			read_unlock(&mrt_lock);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/ipmr-vrf-find-vifs-using-the-actual-device.patch