netdev - [RFC net-next 06/22] ipv4: redirect dst output to lwtunnel output

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Message-Id: <ec85c9cef76c5106822f3647eacca7b31e71abab.1436537414.git.tgraf@suug.ch>
Date:	Fri, 10 Jul 2015 16:19:08 +0200
From:	Thomas Graf <tgraf@...g.ch>
To:	roopa@...ulusnetworks.com, rshearma@...cade.com,
	ebiederm@...ssion.com, hannes@...essinduktion.org,
	pshelar@...ira.com, jesse@...ira.com, davem@...emloft.net,
	daniel@...earbox.net, tom@...bertland.com, edumazet@...gle.com,
	jiri@...nulli.us, marcelo.leitner@...il.com,
	stephen@...workplumber.org, jpettit@...ira.com, kaber@...sh.net
Cc:	netdev@...r.kernel.org, dev@...nvswitch.org
Subject: [RFC net-next 06/22] ipv4: redirect dst output to lwtunnel output

From: Roopa Prabhu <roopa@...ulusnetworks.com>

For input routes with tunnel encap state this patch redirects
dst output functions to lwtunnel_output which later resolves to
the corresponding lwtunnel output function.

This has been tested to work with mpls ip tunnels.

Open items: Support for tunnel mtu, pmtu, fragmentation can be
added by hooking into the corresponding (ipv4, ipv6) dst ops.
We may do this differently when lwtstate moves to dst or dst_metadata
as per upstream discussions.

Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
---
 net/ipv4/route.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index bfc0a18..d3964fa 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1634,6 +1634,8 @@ static int __mkroute_input(struct sk_buff *skb,
 	rth->dst.output = ip_output;
 
 	rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag);
+	if (lwtunnel_output_redirect(rth->rt_lwtstate))
+		rth->dst.output = lwtunnel_output;
 	skb_dst_set(skb, &rth->dst);
 out:
 	err = 0;
-- 
2.4.3

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