From 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Sat, 14 Jul 2007 18:52:56 -0700 Subject: [VLAN]: Fix promiscous/allmulti synchronization races The set_multicast_list function may be called without holding the rtnl mutex, resulting in races when changing the underlying device's promiscous and allmulti state. Use the change_rx_mode hook, which is always invoked under the rtnl. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/8021q/vlan.c | 1 + net/8021q/vlan.h | 1 + net/8021q/vlan_dev.c | 38 ++++++++++++++++++++------------------ 3 files changed, 22 insertions(+), 18 deletions(-) (limited to 'net') diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c index abb9900edb3f..39bdcc25c150 100644 --- a/net/8021q/vlan.c +++ b/net/8021q/vlan.c @@ -373,6 +373,7 @@ void vlan_setup(struct net_device *new_dev) new_dev->open = vlan_dev_open; new_dev->stop = vlan_dev_stop; new_dev->set_multicast_list = vlan_dev_set_multicast_list; + new_dev->change_rx_flags = vlan_change_rx_flags; new_dev->destructor = free_netdev; new_dev->do_ioctl = vlan_dev_ioctl; diff --git a/net/8021q/vlan.h b/net/8021q/vlan.h index 62ce1c519aab..7df5b2935579 100644 --- a/net/8021q/vlan.h +++ b/net/8021q/vlan.h @@ -69,6 +69,7 @@ int vlan_dev_set_vlan_flag(const struct net_device *dev, u32 flag, short flag_val); void vlan_dev_get_realdev_name(const struct net_device *dev, char *result); void vlan_dev_get_vid(const struct net_device *dev, unsigned short *result); +void vlan_change_rx_flags(struct net_device *dev, int change); void vlan_dev_set_multicast_list(struct net_device *vlan_dev); int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id); diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c index d4a62d1b52b4..dec7e62b2e10 100644 --- a/net/8021q/vlan_dev.c +++ b/net/8021q/vlan_dev.c @@ -712,6 +712,11 @@ int vlan_dev_open(struct net_device *dev) } memcpy(vlan->real_dev_addr, real_dev->dev_addr, ETH_ALEN); + if (dev->flags & IFF_ALLMULTI) + dev_set_allmulti(real_dev, 1); + if (dev->flags & IFF_PROMISC) + dev_set_promiscuity(real_dev, 1); + return 0; } @@ -721,6 +726,11 @@ int vlan_dev_stop(struct net_device *dev) vlan_flush_mc_list(dev); + if (dev->flags & IFF_ALLMULTI) + dev_set_allmulti(real_dev, -1); + if (dev->flags & IFF_PROMISC) + dev_set_promiscuity(real_dev, -1); + if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) dev_unicast_delete(real_dev, dev->dev_addr, dev->addr_len); @@ -754,34 +764,26 @@ int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) return err; } +void vlan_change_rx_flags(struct net_device *dev, int change) +{ + struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev; + + if (change & IFF_ALLMULTI) + dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); + if (change & IFF_PROMISC) + dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1); +} + /** Taken from Gleb + Lennert's VLAN code, and modified... */ void vlan_dev_set_multicast_list(struct net_device *vlan_dev) { struct dev_mc_list *dmi; struct net_device *real_dev; - int inc; if (vlan_dev && (vlan_dev->priv_flags & IFF_802_1Q_VLAN)) { /* Then it's a real vlan device, as far as we can tell.. */ real_dev = VLAN_DEV_INFO(vlan_dev)->real_dev; - /* compare the current promiscuity to the last promisc we had.. */ - inc = vlan_dev->promiscuity - VLAN_DEV_INFO(vlan_dev)->old_promiscuity; - if (inc) { - printk(KERN_INFO "%s: dev_set_promiscuity(master, %d)\n", - vlan_dev->name, inc); - dev_set_promiscuity(real_dev, inc); /* found in dev.c */ - VLAN_DEV_INFO(vlan_dev)->old_promiscuity = vlan_dev->promiscuity; - } - - inc = vlan_dev->allmulti - VLAN_DEV_INFO(vlan_dev)->old_allmulti; - if (inc) { - printk(KERN_INFO "%s: dev_set_allmulti(master, %d)\n", - vlan_dev->name, inc); - dev_set_allmulti(real_dev, inc); /* dev.c */ - VLAN_DEV_INFO(vlan_dev)->old_allmulti = vlan_dev->allmulti; - } - /* looking for addresses to add to master's list */ for (dmi = vlan_dev->mc_list; dmi != NULL; dmi = dmi->next) { if (vlan_should_add_mc(dmi, VLAN_DEV_INFO(vlan_dev)->old_mc_list)) { -- cgit v1.2.2