From 42aa916265d740d66ac1f17290366e9494c884c2 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Thu, 9 Oct 2008 11:59:32 -0700 Subject: [PATCH] gre: Move MTU setting out of ipgre_tunnel_bind_dev This patch moves the dev->mtu setting out of ipgre_tunnel_bind_dev. This is in prepartion of using rtnl_link where we'll need to make the MTU setting conditional on whether the user has supplied an MTU. This also requires the move of the ipgre_tunnel_bind_dev call out of the dev->init function so that we can access the user parameters later. This patch also adds a check to prevent setting the MTU below the minimum of 68. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/ipv4/ip_gre.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index fd192d67695..80622dd6fb3 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -119,6 +119,7 @@ static int ipgre_tunnel_init(struct net_device *dev); static void ipgre_tunnel_setup(struct net_device *dev); +static int ipgre_tunnel_bind_dev(struct net_device *dev); /* Fallback tunnel: no source, no destination, no key, no options */ @@ -289,6 +290,8 @@ static struct ip_tunnel * ipgre_tunnel_locate(struct net *net, nt = netdev_priv(dev); nt->parms = *parms; + dev->mtu = ipgre_tunnel_bind_dev(dev); + if (register_netdevice(dev) < 0) goto failed_free; @@ -773,7 +776,7 @@ tx_error: return 0; } -static void ipgre_tunnel_bind_dev(struct net_device *dev) +static int ipgre_tunnel_bind_dev(struct net_device *dev) { struct net_device *tdev = NULL; struct ip_tunnel *tunnel; @@ -821,9 +824,14 @@ static void ipgre_tunnel_bind_dev(struct net_device *dev) addend += 4; } dev->needed_headroom = addend + hlen; - dev->mtu = mtu - dev->hard_header_len - addend; + mtu -= dev->hard_header_len - addend; + + if (mtu < 68) + mtu = 68; + tunnel->hlen = addend; + return mtu; } static int @@ -917,7 +925,7 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) t->parms.iph.frag_off = p.iph.frag_off; if (t->parms.link != p.link) { t->parms.link = p.link; - ipgre_tunnel_bind_dev(dev); + dev->mtu = ipgre_tunnel_bind_dev(dev); netdev_state_change(dev); } } @@ -1108,8 +1116,6 @@ static int ipgre_tunnel_init(struct net_device *dev) memcpy(dev->dev_addr, &tunnel->parms.iph.saddr, 4); memcpy(dev->broadcast, &tunnel->parms.iph.daddr, 4); - ipgre_tunnel_bind_dev(dev); - if (iph->daddr) { #ifdef CONFIG_NET_IPGRE_BROADCAST if (ipv4_is_multicast(iph->daddr)) { -- 2.41.1