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Message-Id: <20180528100215.242897746@linuxfoundation.org>
Date: Mon, 28 May 2018 12:01:30 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Jianlin Shi <jishi@...hat.com>,
Xin Long <lucien.xin@...il.com>,
"David S. Miller" <davem@...emloft.net>,
Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.4 116/268] sit: fix IFLA_MTU ignored on NEWLINK
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Xin Long <lucien.xin@...il.com>
[ Upstream commit 2b3957c34b6d7f03544b12ebbf875eee430745db ]
Commit 128bb975dc3c ("ip6_gre: init dev->mtu and dev->hard_header_len
correctly") fixed IFLA_MTU ignored on NEWLINK for ip6_gre. The same
mtu fix is also needed for sit.
Note that dev->hard_header_len setting for sit works fine, no need to
fix it. sit is actually ipv4 tunnel, it can't call ip6_tnl_change_mtu
to set mtu.
Reported-by: Jianlin Shi <jishi@...hat.com>
Signed-off-by: Xin Long <lucien.xin@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
net/ipv6/sit.c | 7 +++++++
1 file changed, 7 insertions(+)
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1574,6 +1574,13 @@ static int ipip6_newlink(struct net *src
if (err < 0)
return err;
+ if (tb[IFLA_MTU]) {
+ u32 mtu = nla_get_u32(tb[IFLA_MTU]);
+
+ if (mtu >= IPV6_MIN_MTU && mtu <= 0xFFF8 - dev->hard_header_len)
+ dev->mtu = mtu;
+ }
+
#ifdef CONFIG_IPV6_SIT_6RD
if (ipip6_netlink_6rd_parms(data, &ip6rd))
err = ipip6_tunnel_update_6rd(nt, &ip6rd);
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