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Date: Fri, 27 Jul 2007 13:55:28 -0700
From: Mitch Williams <mitch.a.williams@...el.com>
To: netdev@...r.kernel.org
Subject: [PATCH 1/2] HW VLAN filtering control
Add support to the VLAN subsystem for enabling/disabling hardware VLAN
filtering at runtime. This is useful for debugging purposes.
The existing vconfig utility can be used without modification.
Signed-off-by: Mitch Williams <mitch.a.williams@...el.com>
diff -urpN -X dontdiff linux-2.6.22.1-clean/include/linux/if_vlan.h
linux-2.6.22.1/include/linux/if_vlan.h
--- linux-2.6.22.1-clean/include/linux/if_vlan.h 2007-07-10
11:56:30.000000000 -0700
+++ linux-2.6.22.1/include/linux/if_vlan.h 2007-07-26 16:29:00.000000000
-0700
@@ -106,7 +106,20 @@ struct vlan_priority_tci_mapping {
*/
struct vlan_priority_tci_mapping *next;
};
-
+#define VLAN_FLAG_REORDER 1 /* (1 << 0) re_order_header This option
will cause the
+ * VLAN code to move around the ethernet header on
+ * ingress to make the skb look **exactly** like it
+ * came in from an ethernet port. This destroys some of
+ * the VLAN information in the skb, but it fixes programs
+ * like DHCP that use packet-filtering and don't understand
+ * 802.1Q
+ */
+
+#define VLAN_FLAG_DISABLE_FILTER 2 /* (1 << 1) disable HW filtering.
This flag allows
+ * devices that perform hardware filtering to
+ * turn off filtering. This may be useful for
+ * debugging or for sniffer applications.
+ */
/* Holds information that makes sense if this device is a VLAN device.
*/
struct vlan_dev_info {
/** This will be the mapping that correlates skb->priority to
@@ -116,14 +129,7 @@ struct vlan_dev_info {
struct vlan_priority_tci_mapping *egress_priority_map[16]; /* hash
table */
unsigned short vlan_id; /* The VLAN Identifier for this
interface. */
- unsigned short flags; /* (1 << 0) re_order_header This
option will cause the
- * VLAN code to move around
the ethernet header on
- * ingress to make the skb
look **exactly** like it
- * came in from an ethernet
port. This destroys some of
- * the VLAN information in the
skb, but it fixes programs
- * like DHCP that use
packet-filtering and don't understand
- * 802.1Q
- */
+ unsigned short flags;
struct dev_mc_list *old_mc_list; /* old multi-cast list for the VLAN
interface..
* we save this so we can
tell what changes were
* made, in order to feed the
right changes down
diff -urpN -X dontdiff linux-2.6.22.1-clean/include/linux/netdevice.h
linux-2.6.22.1/include/linux/netdevice.h
--- linux-2.6.22.1-clean/include/linux/netdevice.h 2007-07-10
11:56:30.000000000 -0700
+++ linux-2.6.22.1/include/linux/netdevice.h 2007-07-26
16:29:00.000000000 -0700
@@ -522,7 +522,9 @@ struct net_device
unsigned short vid);
void (*vlan_rx_kill_vid)(struct net_device *dev,
unsigned short vid);
-
+#define HAVE_VLAN_FLAGS
+ int (*vlan_set_flag)(struct net_device *dev,
+ unsigned int flag, int value);
int (*hard_header_parse)(struct sk_buff *skb,
unsigned char *haddr);
int (*neigh_setup)(struct net_device *dev, struct neigh_parms *);
diff -urpN -X dontdiff linux-2.6.22.1-clean/net/8021q/vlan_dev.c
linux-2.6.22.1/net/8021q/vlan_dev.c
--- linux-2.6.22.1-clean/net/8021q/vlan_dev.c 2007-07-10
11:56:30.000000000 -0700
+++ linux-2.6.22.1/net/8021q/vlan_dev.c 2007-07-27 11:40:22.000000000
-0700
@@ -593,37 +593,58 @@ int vlan_dev_set_egress_priority(char *d
/* Flags are defined in the vlan_dev_info class in
include/linux/if_vlan.h file. */
int vlan_dev_set_vlan_flag(char *dev_name, __u32 flag, short flag_val)
{
+ struct net_device *real_dev;
struct net_device *dev = dev_get_by_name(dev_name);
+ int ret = 0;
- if (dev) {
- if (dev->priv_flags & IFF_802_1Q_VLAN) {
- /* verify flag is supported */
- if (flag == 1) {
- if (flag_val) {
- VLAN_DEV_INFO(dev)->flags |= 1;
- } else {
- VLAN_DEV_INFO(dev)->flags &= ~1;
- }
- dev_put(dev);
- return 0;
- } else {
- printk(KERN_ERR "%s: flag %i is not valid.\n",
- __FUNCTION__, (int)(flag));
- dev_put(dev);
- return -EINVAL;
- }
- } else {
- printk(KERN_ERR
- "%s: %s is not a vlan device, priv_flags: %hX.\n",
- __FUNCTION__, dev->name, dev->priv_flags);
- dev_put(dev);
- }
- } else {
+ if (!dev) {
printk(KERN_ERR "%s: Could not find device: %s\n",
__FUNCTION__, dev_name);
+ ret = -EINVAL;
+ goto out_no_dev;
+ }
+
+ if (!(dev->priv_flags & IFF_802_1Q_VLAN)) {
+ printk(KERN_ERR
+ "%s: %s is not a vlan device, priv_flags: %hX.\n",
+ __FUNCTION__, dev->name, dev->priv_flags);
+ dev_put(dev);
+ ret = -EINVAL;
+ goto out;
+ }
+
+ real_dev = VLAN_DEV_INFO(dev)->real_dev;
+ switch (flag) {
+ case VLAN_FLAG_REORDER:
+ if (flag_val)
+ VLAN_DEV_INFO(dev)->flags |= 1;
+ else
+ VLAN_DEV_INFO(dev)->flags &= ~1;
+ break;
+
+ case VLAN_FLAG_DISABLE_FILTER:
+ if (real_dev->vlan_set_flag)
+ ret = real_dev->vlan_set_flag(real_dev,
+ flag, flag_val);
+ else {
+ printk(KERN_ERR
+ "%s: VLAN flags not supported on base device %s.\n",
+ __FUNCTION__, real_dev->name);
+ ret = -EINVAL;
+ }
+ break;
+
+ default:
+ printk(KERN_ERR "%s: VLAN flag %d is invalid.\n",
+ __FUNCTION__, flag);
+ ret = -EINVAL;
+ break;
}
- return -EINVAL;
+out:
+ dev_put(dev);
+out_no_dev:
+ return ret;
}
-
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