[PATCH v4 net-next 06/20] ipv6: Handle all fib6_nh in a nexthop in fib6_info_uses_dev

[David Ahern <dsahern@kernel.org>]

From: David Ahern <dsahern@gmail.com>

Add a hook in fib6_info_uses_dev to handle nexthop struct in a fib6_info.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 net/ipv6/route.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d1139ef077cd..d56e1ff49e47 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -5190,9 +5190,27 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
 	return -EMSGSIZE;
 }
 
+static int fib6_info_nh_uses_dev(struct fib6_nh *nh, void *arg)
+{
+	const struct net_device *dev = arg;
+
+	if (nh->fib_nh_dev == dev)
+		return 1;
+
+	return 0;
+}
+
 static bool fib6_info_uses_dev(const struct fib6_info *f6i,
 			       const struct net_device *dev)
 {
+	if (f6i->nh) {
+		struct net_device *_dev = (struct net_device *)dev;
+
+		return !!nexthop_for_each_fib6_nh(f6i->nh,
+						  fib6_info_nh_uses_dev,
+						  _dev);
+	}
+
 	if (f6i->fib6_nh->fib_nh_dev == dev)
 		return true;
 
-- 
2.11.0