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authorHerbert Xu <herbert@gondor.apana.org.au>2009-10-30 05:51:48 +0000
committerDavid S. Miller <davem@davemloft.net>2009-10-30 12:28:07 -0700
commit2e9526b352061ee0fd2a1580a2e3a5af960dabc4 (patch)
tree589ae8d9832a929acc68f58cdb8f8b84fb35978e
parent33cb7d33a1c36e07839d08a4d1a33bf6a0f70bba (diff)
downloadvexpress-lsk-2e9526b352061ee0fd2a1580a2e3a5af960dabc4.tar.gz
gre: Fix dev_addr clobbering for gretap
Nathan Neulinger noticed that gretap devices get their MAC address from the local IP address, which results in invalid MAC addresses half of the time. This is because gretap is still using the tunnel netdev ops rather than the correct tap netdev ops struct. This patch also fixes changelink to not clobber the MAC address for the gretap case. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Tested-by: Nathan Neulinger <nneul@mst.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/ip_gre.c28
1 files changed, 16 insertions, 12 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 41ada9904d3..14333385262 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1464,7 +1464,7 @@ static void ipgre_tap_setup(struct net_device *dev)
ether_setup(dev);
- dev->netdev_ops = &ipgre_netdev_ops;
+ dev->netdev_ops = &ipgre_tap_netdev_ops;
dev->destructor = free_netdev;
dev->iflink = 0;
@@ -1525,25 +1525,29 @@ static int ipgre_changelink(struct net_device *dev, struct nlattr *tb[],
if (t->dev != dev)
return -EEXIST;
} else {
- unsigned nflags = 0;
-
t = nt;
- if (ipv4_is_multicast(p.iph.daddr))
- nflags = IFF_BROADCAST;
- else if (p.iph.daddr)
- nflags = IFF_POINTOPOINT;
+ if (dev->type != ARPHRD_ETHER) {
+ unsigned nflags = 0;
- if ((dev->flags ^ nflags) &
- (IFF_POINTOPOINT | IFF_BROADCAST))
- return -EINVAL;
+ if (ipv4_is_multicast(p.iph.daddr))
+ nflags = IFF_BROADCAST;
+ else if (p.iph.daddr)
+ nflags = IFF_POINTOPOINT;
+
+ if ((dev->flags ^ nflags) &
+ (IFF_POINTOPOINT | IFF_BROADCAST))
+ return -EINVAL;
+ }
ipgre_tunnel_unlink(ign, t);
t->parms.iph.saddr = p.iph.saddr;
t->parms.iph.daddr = p.iph.daddr;
t->parms.i_key = p.i_key;
- memcpy(dev->dev_addr, &p.iph.saddr, 4);
- memcpy(dev->broadcast, &p.iph.daddr, 4);
+ if (dev->type != ARPHRD_ETHER) {
+ memcpy(dev->dev_addr, &p.iph.saddr, 4);
+ memcpy(dev->broadcast, &p.iph.daddr, 4);
+ }
ipgre_tunnel_link(ign, t);
netdev_state_change(dev);
}