From 5e7565930524410f097f5b04f8aba663089a6ffc Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Wed, 25 Nov 2009 07:54:54 +0000 Subject: [PATCH] vlan: support "loose binding" to the underlying network device Currently the UP/DOWN state of VLANs is synchronized to the state of the underlying device, meaning all VLANs are set down once the underlying device is set down. This causes all routes to the VLAN devices to vanish. Add a flag to specify a "loose binding" mode, in which only the operstate is transfered, but the VLAN device state is independant. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- include/linux/if_vlan.h | 1 + net/8021q/vlan.c | 9 +++++++-- net/8021q/vlan_dev.c | 6 ++++-- net/8021q/vlan_netlink.c | 3 ++- 4 files changed, 14 insertions(+), 5 deletions(-) diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h index 153f6b9e722..3d870fda8c4 100644 --- a/include/linux/if_vlan.h +++ b/include/linux/if_vlan.h @@ -339,6 +339,7 @@ enum vlan_ioctl_cmds { enum vlan_flags { VLAN_FLAG_REORDER_HDR = 0x1, VLAN_FLAG_GVRP = 0x2, + VLAN_FLAG_LOOSE_BINDING = 0x4, }; enum vlan_name_types { diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c index 1483243edf1..225aa2fac0e 100644 --- a/net/8021q/vlan.c +++ b/net/8021q/vlan.c @@ -431,6 +431,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event, struct vlan_group *grp; int i, flgs; struct net_device *vlandev; + struct vlan_dev_info *vlan; LIST_HEAD(list); if (is_vlan_dev(dev)) @@ -507,7 +508,9 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event, if (!(flgs & IFF_UP)) continue; - dev_change_flags(vlandev, flgs & ~IFF_UP); + vlan = vlan_dev_info(vlandev); + if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) + dev_change_flags(vlandev, flgs & ~IFF_UP); vlan_transfer_operstate(dev, vlandev); } break; @@ -523,7 +526,9 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event, if (flgs & IFF_UP) continue; - dev_change_flags(vlandev, flgs | IFF_UP); + vlan = vlan_dev_info(vlandev); + if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) + dev_change_flags(vlandev, flgs | IFF_UP); vlan_transfer_operstate(dev, vlandev); } break; diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c index de0dc6bacbe..b7889782047 100644 --- a/net/8021q/vlan_dev.c +++ b/net/8021q/vlan_dev.c @@ -431,7 +431,8 @@ int vlan_dev_change_flags(const struct net_device *dev, u32 flags, u32 mask) struct vlan_dev_info *vlan = vlan_dev_info(dev); u32 old_flags = vlan->flags; - if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP)) + if (mask & ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | + VLAN_FLAG_LOOSE_BINDING)) return -EINVAL; vlan->flags = (old_flags & ~mask) | (flags & mask); @@ -456,7 +457,8 @@ static int vlan_dev_open(struct net_device *dev) struct net_device *real_dev = vlan->real_dev; int err; - if (!(real_dev->flags & IFF_UP)) + if (!(real_dev->flags & IFF_UP) && + !(vlan->flags & VLAN_FLAG_LOOSE_BINDING)) return -ENETDOWN; if (compare_ether_addr(dev->dev_addr, real_dev->dev_addr)) { diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c index 3c9cf6a8e7f..ddc105734af 100644 --- a/net/8021q/vlan_netlink.c +++ b/net/8021q/vlan_netlink.c @@ -60,7 +60,8 @@ static int vlan_validate(struct nlattr *tb[], struct nlattr *data[]) if (data[IFLA_VLAN_FLAGS]) { flags = nla_data(data[IFLA_VLAN_FLAGS]); if ((flags->flags & flags->mask) & - ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP)) + ~(VLAN_FLAG_REORDER_HDR | VLAN_FLAG_GVRP | + VLAN_FLAG_LOOSE_BINDING)) return -EINVAL; }