linux-kernel - [PATCH 4.4 05/34] ip6_gre: fix flowi6_proto value in ip6gre_xmit

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Message-Id: <20161113112400.255574130@linuxfoundation.org>
Date:   Sun, 13 Nov 2016 12:24:37 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiri Benc <jbenc@...hat.com>,
        Shmulik Ladkani <shmulik.ladkani@...il.com>,
        Lance Richardson <lrichard@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 05/34] ip6_gre: fix flowi6_proto value in ip6gre_xmit_other()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lance Richardson <lrichard@...hat.com>

[ Upstream commit db32e4e49ce2b0e5fcc17803d011a401c0a637f6 ]

Similar to commit 3be07244b733 ("ip6_gre: fix flowi6_proto value in
xmit path"), set flowi6_proto to IPPROTO_GRE for output route lookup.

Up until now, ip6gre_xmit_other() has set flowi6_proto to a bogus value.
This affected output route lookup for packets sent on an ip6gretap device
in cases where routing was dependent on the value of flowi6_proto.

Since the correct proto is already set in the tunnel flowi6 template via
commit 252f3f5a1189 ("ip6_gre: Set flowi6_proto as IPPROTO_GRE in xmit
path."), simply delete the line setting the incorrect flowi6_proto value.

Suggested-by: Jiri Benc <jbenc@...hat.com>
Fixes: c12b395a4664 ("gre: Support GRE over IPv6")
Reviewed-by: Shmulik Ladkani <shmulik.ladkani@...il.com>
Signed-off-by: Lance Richardson <lrichard@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/ip6_gre.c |    1 -
 1 file changed, 1 deletion(-)

--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -886,7 +886,6 @@ static int ip6gre_xmit_other(struct sk_b
 		encap_limit = t->parms.encap_limit;

 	memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
-	fl6.flowi6_proto = skb->protocol;

 	err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);