netdev - [PATCH net] vrf: check accept_source_route on the original netdevice

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Date:   Wed, 27 Mar 2019 14:27:48 -0400
From:   Stephen Suryaputra <ssuryaextr@...il.com>
To:     netdev@...r.kernel.org
Cc:     Stephen Suryaputra <ssuryaextr@...il.com>
Subject: [PATCH net] vrf: check accept_source_route on the original netdevice

Configuration check to accept source route IP options should be made on the
incoming netdevice when the skb->dev is an l3mdev master.

Signed-off-by: Stephen Suryaputra <ssuryaextr@...il.com>
---
 net/ipv4/ip_input.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index ecce2dc78f17..754176222ef6 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -263,6 +263,9 @@ static inline bool ip_rcv_options(struct sk_buff *skb)
 	const struct iphdr *iph;
 	struct net_device *dev = skb->dev;
 
+	if (netif_is_l3_master(dev))
+		dev = __dev_get_by_index(dev_net(dev), IPCB(skb)->iif);
+
 	/* It looks as overkill, because not all
 	   IP options require packet mangling.
 	   But it is the easiest for now, especially taking
-- 
2.17.1