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Commit ff2926d8 authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'tunnel-mtu-fixes' 



Xin Long says:

====================
net: fix IFLA_MTU ignored on NEWLINK for some ip and ipv6 tunnels

The fix for ip_gre follows the way other ip tunnels do: not to
set mtu in ndo_init, as ip_tunnel_newlink will take care of it
properly.

The fix for ip6_tunnel and sit follows the way ipv6 tunenls do:
to set mtu again according to IFLA_MTU after, as all bind_dev
are called in ndo_init where it can't get the tb[IFLA_MTU].
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 9c2c2e62 2b3957c3

net/ipv4/ip_gre.c

+0 −5
Original line number Diff line number Diff line
@@ -970,9 +970,6 @@ static void __gre_tunnel_init(struct net_device *dev) 


	t_hlen = tunnel->hlen + sizeof(struct iphdr);



	dev->needed_headroom	= LL_MAX_HEADER + t_hlen + 4;

	dev->mtu		= ETH_DATA_LEN - t_hlen - 4;



	dev->features		|= GRE_FEATURES;

	dev->hw_features	|= GRE_FEATURES;
@@ -1290,8 +1287,6 @@ static int erspan_tunnel_init(struct net_device *dev) 
		       erspan_hdr_len(tunnel->erspan_ver);

	t_hlen = tunnel->hlen + sizeof(struct iphdr);



	dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4;

	dev->mtu = ETH_DATA_LEN - t_hlen - 4;

	dev->features		|= GRE_FEATURES;

	dev->hw_features	|= GRE_FEATURES;

	dev->priv_flags		|= IFF_LIVE_ADDR_CHANGE;

net/ipv6/ip6_tunnel.c

+8 −4
Original line number Diff line number Diff line
@@ -1982,14 +1982,14 @@ static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 
{

	struct net *net = dev_net(dev);

	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);

	struct ip6_tnl *nt, *t;

	struct ip_tunnel_encap ipencap;

	struct ip6_tnl *nt, *t;

	int err;



	nt = netdev_priv(dev);



	if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {

		int err = ip6_tnl_encap_setup(nt, &ipencap);



		err = ip6_tnl_encap_setup(nt, &ipencap);

		if (err < 0)

			return err;

	}
@@ -2005,7 +2005,11 @@ static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev, 
			return -EEXIST;

	}



	return ip6_tnl_create2(dev);

	err = ip6_tnl_create2(dev);

	if (!err && tb[IFLA_MTU])

		ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));



	return err;

}



static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],

net/ipv6/sit.c

+7 −0
Original line number Diff line number Diff line
@@ -1578,6 +1578,13 @@ static int ipip6_newlink(struct net *src_net, struct net_device *dev, 
	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);