vxlan: fix fdb_dump index calculation

This change “vxlan: fix fdb_dump index calculation” in Linux kernel is authored by Atzm Watanabe <atzm [at] iij.ad.jp> on Mon Aug 10 23:39:09 2015 +0900.

vxlan: fix fdb_dump index calculation

When too many remotes are bound to an FDB entry, index may not be increased.
This problem will be caused on the large scale environment that is based on
the unicast default destination, for instance.

Signed-off-by: Atzm Watanabe <atzm@iij.ad.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>

This Linux change may have been applied to various maintained Linux releases and you can find Linux releases including commit 07a51cd.

There are 10 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/net/vxlan.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index b6731fa..06c0731 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -931,10 +931,10 @@ static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 		hlist_for_each_entry_rcu(f, &vxlan->fdb_head[h], hlist) {
 			struct vxlan_rdst *rd;
-			if (idx < cb->args[0])
-				goto skip;
 			list_for_each_entry_rcu(rd, &f->remotes, list) {
+				if (idx < cb->args[0])
+					goto skip;
 				err = vxlan_fdb_info(skb, vxlan, f,
@@ -942,9 +942,9 @@ static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 						     NLM_F_MULTI, rd);
 				if (err < 0)
 					goto out;
-			}
-			++idx;
+				++idx;
+			}

The commit for this change in Linux stable tree is 07a51cd (patch).

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