netdev - [net-next RFC 14/14] arp: Associate ARP requests with tunnel info

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Message-Id: <d78d2546705d07a7ea4b0fa017e1c21f2cf3745c.1433167296.git.tgraf@suug.ch>
Date:	Mon,  1 Jun 2015 16:27:38 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	netdev@...r.kernel.org
Cc:	pshelar@...ira.com, jesse@...ira.com, davem@...emloft.net,
	daniel@...earbox.net, dev@...nvswitch.org, tom@...bertland.com,
	edumazet@...gle.com, jiri@...nulli.us, hannes@...essinduktion.org,
	marcelo.leitner@...il.com, stephen@...workplumber.org,
	jpettit@...ira.com, kaber@...sh.net
Subject: [net-next RFC 14/14] arp: Associate ARP requests with tunnel info

Since ARP performs its own route lookup call, eventually
returned tunnel metadata must be attached manually.

Signed-off-by: Thomas Graf <tgraf@...g.ch>
---
 net/ipv4/arp.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 933a928..6cf0502 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -489,6 +489,7 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
 	unsigned char *arp_ptr;
 	int hlen = LL_RESERVED_SPACE(dev);
 	int tlen = dev->needed_tailroom;
+	struct rtable *rt;
 
 	/*
 	 *	Allocate a buffer
@@ -577,6 +578,13 @@ struct sk_buff *arp_create(int type, int ptype, __be32 dest_ip,
 	}
 	memcpy(arp_ptr, &dest_ip, 4);
 
+	rt = ip_route_output(dev_net(dev), dest_ip, src_ip, 0, dev->ifindex);
+	if (!IS_ERR(rt)) {
+		if (rt->rt_tun_info)
+			skb_attach_tunnel_info(skb, rt->rt_tun_info);
+		ip_rt_put(rt);
+	}
+
 	return skb;
 
 out:
-- 
2.3.5

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