Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 890 insertions, 0 deletions

diff --git a/net/8021q/vlan_dev.c b/net/8021q/vlan_dev.c
new file mode 100644
index 000000000000..49c487413518
--- /dev/null
+++ b/net/8021q/vlan_dev.c
@@ -0,0 +1,890 @@
+/* -*- linux-c -*-
+ * INET		802.1Q VLAN
+ *		Ethernet-type device handling.
+ *
+ * Authors:	Ben Greear <greearb@candelatech.com>
+ *              Please send support related email to: vlan@scry.wanfear.com
+ *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
+ * 
+ * Fixes:       Mar 22 2001: Martin Bokaemper <mbokaemper@unispherenetworks.com>
+ *                - reset skb->pkt_type on incoming packets when MAC was changed
+ *                - see that changed MAC is saddr for outgoing packets
+ *              Oct 20, 2001:  Ard van Breeman:
+ *                - Fix MC-list, finally.
+ *                - Flush MC-list on VLAN destroy.
+ *                
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/in.h>
+#include <linux/init.h>
+#include <asm/uaccess.h> /* for copy_from_user */
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <net/datalink.h>
+#include <net/p8022.h>
+#include <net/arp.h>
+
+#include "vlan.h"
+#include "vlanproc.h"
+#include <linux/if_vlan.h>
+#include <net/ip.h>
+
+/*
+ *	Rebuild the Ethernet MAC header. This is called after an ARP
+ *	(or in future other address resolution) has completed on this
+ *	sk_buff. We now let ARP fill in the other fields.
+ *
+ *	This routine CANNOT use cached dst->neigh!
+ *	Really, it is used only when dst->neigh is wrong.
+ *
+ * TODO:  This needs a checkup, I'm ignorant here. --BLG
+ */
+int vlan_dev_rebuild_header(struct sk_buff *skb)
+{
+	struct net_device *dev = skb->dev;
+	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
+
+	switch (veth->h_vlan_encapsulated_proto) {
+#ifdef CONFIG_INET
+	case __constant_htons(ETH_P_IP):
+
+		/* TODO:  Confirm this will work with VLAN headers... */
+		return arp_find(veth->h_dest, skb);
+#endif	
+	default:
+		printk(VLAN_DBG
+		       "%s: unable to resolve type %X addresses.\n", 
+		       dev->name, (int)veth->h_vlan_encapsulated_proto);
+	 
+		memcpy(veth->h_source, dev->dev_addr, ETH_ALEN);
+		break;
+	};
+
+	return 0;
+}
+
+static inline struct sk_buff *vlan_check_reorder_header(struct sk_buff *skb)
+{
+	if (VLAN_DEV_INFO(skb->dev)->flags & 1) {
+		if (skb_shared(skb) || skb_cloned(skb)) {
+			struct sk_buff *nskb = skb_copy(skb, GFP_ATOMIC);
+			kfree_skb(skb);
+			skb = nskb;
+		}
+		if (skb) {
+			/* Lifted from Gleb's VLAN code... */
+			memmove(skb->data - ETH_HLEN,
+				skb->data - VLAN_ETH_HLEN, 12);
+			skb->mac.raw += VLAN_HLEN;
+		}
+	}
+
+	return skb;
+}
+
+/*
+ *	Determine the packet's protocol ID. The rule here is that we 
+ *	assume 802.3 if the type field is short enough to be a length.
+ *	This is normal practice and works for any 'now in use' protocol.
+ *
+ *  Also, at this point we assume that we ARE dealing exclusively with
+ *  VLAN packets, or packets that should be made into VLAN packets based
+ *  on a default VLAN ID.
+ *
+ *  NOTE:  Should be similar to ethernet/eth.c.
+ *
+ *  SANITY NOTE:  This method is called when a packet is moving up the stack
+ *                towards userland.  To get here, it would have already passed
+ *                through the ethernet/eth.c eth_type_trans() method.
+ *  SANITY NOTE 2: We are referencing to the VLAN_HDR frields, which MAY be
+ *                 stored UNALIGNED in the memory.  RISC systems don't like
+ *                 such cases very much...
+ *  SANITY NOTE 2a:  According to Dave Miller & Alexey, it will always be aligned,
+ *                 so there doesn't need to be any of the unaligned stuff.  It has
+ *                 been commented out now...  --Ben
+ *
+ */
+int vlan_skb_recv(struct sk_buff *skb, struct net_device *dev,
+                  struct packet_type* ptype)
+{
+	unsigned char *rawp = NULL;
+	struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data);
+	unsigned short vid;
+	struct net_device_stats *stats;
+	unsigned short vlan_TCI;
+	unsigned short proto;
+
+	/* vlan_TCI = ntohs(get_unaligned(&vhdr->h_vlan_TCI)); */
+	vlan_TCI = ntohs(vhdr->h_vlan_TCI);
+
+	vid = (vlan_TCI & VLAN_VID_MASK);
+
+#ifdef VLAN_DEBUG
+	printk(VLAN_DBG "%s: skb: %p vlan_id: %hx\n",
+		__FUNCTION__, skb, vid);
+#endif
+
+	/* Ok, we will find the correct VLAN device, strip the header,
+	 * and then go on as usual.
+	 */
+
+	/* We have 12 bits of vlan ID.
+	 *
+	 * We must not drop allow preempt until we hold a
+	 * reference to the device (netif_rx does that) or we
+	 * fail.
+	 */
+
+	rcu_read_lock();
+	skb->dev = __find_vlan_dev(dev, vid);
+	if (!skb->dev) {
+		rcu_read_unlock();
+
+#ifdef VLAN_DEBUG
+		printk(VLAN_DBG "%s: ERROR: No net_device for VID: %i on dev: %s [%i]\n",
+			__FUNCTION__, (unsigned int)(vid), dev->name, dev->ifindex);
+#endif
+		kfree_skb(skb);
+		return -1;
+	}
+
+	skb->dev->last_rx = jiffies;
+
+	/* Bump the rx counters for the VLAN device. */
+	stats = vlan_dev_get_stats(skb->dev);
+	stats->rx_packets++;
+	stats->rx_bytes += skb->len;
+
+	skb_pull(skb, VLAN_HLEN); /* take off the VLAN header (4 bytes currently) */
+
+	/* Ok, lets check to make sure the device (dev) we
+	 * came in on is what this VLAN is attached to.
+	 */
+
+	if (dev != VLAN_DEV_INFO(skb->dev)->real_dev) {
+		rcu_read_unlock();
+
+#ifdef VLAN_DEBUG
+		printk(VLAN_DBG "%s: dropping skb: %p because came in on wrong device, dev: %s  real_dev: %s, skb_dev: %s\n",
+			__FUNCTION__, skb, dev->name, 
+			VLAN_DEV_INFO(skb->dev)->real_dev->name, 
+			skb->dev->name);
+#endif
+		kfree_skb(skb);
+		stats->rx_errors++;
+		return -1;
+	}
+
+	/*
+	 * Deal with ingress priority mapping.
+	 */
+	skb->priority = vlan_get_ingress_priority(skb->dev, ntohs(vhdr->h_vlan_TCI));
+
+#ifdef VLAN_DEBUG
+	printk(VLAN_DBG "%s: priority: %lu  for TCI: %hu (hbo)\n",
+		__FUNCTION__, (unsigned long)(skb->priority), 
+		ntohs(vhdr->h_vlan_TCI));
+#endif
+
+	/* The ethernet driver already did the pkt_type calculations
+	 * for us...
+	 */
+	switch (skb->pkt_type) {
+	case PACKET_BROADCAST: /* Yeah, stats collect these together.. */
+		// stats->broadcast ++; // no such counter :-(
+		break;
+
+	case PACKET_MULTICAST:
+		stats->multicast++;
+		break;
+
+	case PACKET_OTHERHOST: 
+		/* Our lower layer thinks this is not local, let's make sure.
+		 * This allows the VLAN to have a different MAC than the underlying
+		 * device, and still route correctly.
+		 */
+		if (memcmp(eth_hdr(skb)->h_dest, skb->dev->dev_addr, ETH_ALEN) == 0) {
+			/* It is for our (changed) MAC-address! */
+			skb->pkt_type = PACKET_HOST;
+		}
+		break;
+	default:
+		break;
+	};
+
+	/*  Was a VLAN packet, grab the encapsulated protocol, which the layer
+	 * three protocols care about.
+	 */
+	/* proto = get_unaligned(&vhdr->h_vlan_encapsulated_proto); */
+	proto = vhdr->h_vlan_encapsulated_proto;
+
+	skb->protocol = proto;
+	if (ntohs(proto) >= 1536) {
+		/* place it back on the queue to be handled by
+		 * true layer 3 protocols.
+		 */
+
+		/* See if we are configured to re-write the VLAN header
+		 * to make it look like ethernet...
+		 */
+		skb = vlan_check_reorder_header(skb);
+
+		/* Can be null if skb-clone fails when re-ordering */
+		if (skb) {
+			netif_rx(skb);
+		} else {
+			/* TODO:  Add a more specific counter here. */
+			stats->rx_errors++;
+		}
+		rcu_read_unlock();
+		return 0;
+	}
+
+	rawp = skb->data;
+
+	/*
+	 * This is a magic hack to spot IPX packets. Older Novell breaks
+	 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
+	 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
+	 * won't work for fault tolerant netware but does for the rest.
+	 */
+	if (*(unsigned short *)rawp == 0xFFFF) {
+		skb->protocol = __constant_htons(ETH_P_802_3);
+		/* place it back on the queue to be handled by true layer 3 protocols.
+		 */
+
+		/* See if we are configured to re-write the VLAN header
+		 * to make it look like ethernet...
+		 */
+		skb = vlan_check_reorder_header(skb);
+
+		/* Can be null if skb-clone fails when re-ordering */
+		if (skb) {
+			netif_rx(skb);
+		} else {
+			/* TODO:  Add a more specific counter here. */
+			stats->rx_errors++;
+		}
+		rcu_read_unlock();
+		return 0;
+	}
+
+	/*
+	 *	Real 802.2 LLC
+	 */
+	skb->protocol = __constant_htons(ETH_P_802_2);
+	/* place it back on the queue to be handled by upper layer protocols.
+	 */
+
+	/* See if we are configured to re-write the VLAN header
+	 * to make it look like ethernet...
+	 */
+	skb = vlan_check_reorder_header(skb);
+
+	/* Can be null if skb-clone fails when re-ordering */
+	if (skb) {
+		netif_rx(skb);
+	} else {
+		/* TODO:  Add a more specific counter here. */
+		stats->rx_errors++;
+	}
+	rcu_read_unlock();
+	return 0;
+}
+
+static inline unsigned short vlan_dev_get_egress_qos_mask(struct net_device* dev,
+							  struct sk_buff* skb)
+{
+	struct vlan_priority_tci_mapping *mp =
+		VLAN_DEV_INFO(dev)->egress_priority_map[(skb->priority & 0xF)];
+
+	while (mp) {
+		if (mp->priority == skb->priority) {
+			return mp->vlan_qos; /* This should already be shifted to mask
+					      * correctly with the VLAN's TCI
+					      */
+		}
+		mp = mp->next;
+	}
+	return 0;
+}
+
+/*
+ *	Create the VLAN header for an arbitrary protocol layer 
+ *
+ *	saddr=NULL	means use device source address
+ *	daddr=NULL	means leave destination address (eg unresolved arp)
+ *
+ *  This is called when the SKB is moving down the stack towards the
+ *  physical devices.
+ */
+int vlan_dev_hard_header(struct sk_buff *skb, struct net_device *dev,
+                         unsigned short type, void *daddr, void *saddr,
+                         unsigned len)
+{
+	struct vlan_hdr *vhdr;
+	unsigned short veth_TCI = 0;
+	int rc = 0;
+	int build_vlan_header = 0;
+	struct net_device *vdev = dev; /* save this for the bottom of the method */
+
+#ifdef VLAN_DEBUG
+	printk(VLAN_DBG "%s: skb: %p type: %hx len: %x vlan_id: %hx, daddr: %p\n",
+		__FUNCTION__, skb, type, len, VLAN_DEV_INFO(dev)->vlan_id, daddr);
+#endif
+
+	/* build vlan header only if re_order_header flag is NOT set.  This
+	 * fixes some programs that get confused when they see a VLAN device
+	 * sending a frame that is VLAN encoded (the consensus is that the VLAN
+	 * device should look completely like an Ethernet device when the
+	 * REORDER_HEADER flag is set)	The drawback to this is some extra 
+	 * header shuffling in the hard_start_xmit.  Users can turn off this
+	 * REORDER behaviour with the vconfig tool.
+	 */
+	build_vlan_header = ((VLAN_DEV_INFO(dev)->flags & 1) == 0);
+
+	if (build_vlan_header) {
+		vhdr = (struct vlan_hdr *) skb_push(skb, VLAN_HLEN);
+
+		/* build the four bytes that make this a VLAN header. */
+
+		/* Now, construct the second two bytes. This field looks something
+		 * like:
+		 * usr_priority: 3 bits	 (high bits)
+		 * CFI		 1 bit
+		 * VLAN ID	 12 bits (low bits)
+		 *
+		 */
+		veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
+		veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
+
+		vhdr->h_vlan_TCI = htons(veth_TCI);
+
+		/*
+		 *  Set the protocol type.
+		 *  For a packet of type ETH_P_802_3 we put the length in here instead.
+		 *  It is up to the 802.2 layer to carry protocol information.
+		 */
+
+		if (type != ETH_P_802_3) {
+			vhdr->h_vlan_encapsulated_proto = htons(type);
+		} else {
+			vhdr->h_vlan_encapsulated_proto = htons(len);
+		}
+	}
+
+	/* Before delegating work to the lower layer, enter our MAC-address */
+	if (saddr == NULL)
+		saddr = dev->dev_addr;
+
+	dev = VLAN_DEV_INFO(dev)->real_dev;
+
+	/* MPLS can send us skbuffs w/out enough space.	 This check will grow the
+	 * skb if it doesn't have enough headroom.  Not a beautiful solution, so
+	 * I'll tick a counter so that users can know it's happening...	 If they
+	 * care...
+	 */
+
+	/* NOTE:  This may still break if the underlying device is not the final
+	 * device (and thus there are more headers to add...)  It should work for
+	 * good-ole-ethernet though.
+	 */
+	if (skb_headroom(skb) < dev->hard_header_len) {
+		struct sk_buff *sk_tmp = skb;
+		skb = skb_realloc_headroom(sk_tmp, dev->hard_header_len);
+		kfree_skb(sk_tmp);
+		if (skb == NULL) {
+			struct net_device_stats *stats = vlan_dev_get_stats(vdev);
+			stats->tx_dropped++;
+			return -ENOMEM;
+		}
+		VLAN_DEV_INFO(vdev)->cnt_inc_headroom_on_tx++;
+#ifdef VLAN_DEBUG
+		printk(VLAN_DBG "%s: %s: had to grow skb.\n", __FUNCTION__, vdev->name);
+#endif
+	}
+
+	if (build_vlan_header) {
+		/* Now make the underlying real hard header */
+		rc = dev->hard_header(skb, dev, ETH_P_8021Q, daddr, saddr, len + VLAN_HLEN);
+
+		if (rc > 0) {
+			rc += VLAN_HLEN;
+		} else if (rc < 0) {
+			rc -= VLAN_HLEN;
+		}
+	} else {
+		/* If here, then we'll just make a normal looking ethernet frame,
+		 * but, the hard_start_xmit method will insert the tag (it has to
+		 * be able to do this for bridged and other skbs that don't come
+		 * down the protocol stack in an orderly manner.
+		 */
+		rc = dev->hard_header(skb, dev, type, daddr, saddr, len);
+	}
+
+	return rc;
+}
+
+int vlan_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct net_device_stats *stats = vlan_dev_get_stats(dev);
+	struct vlan_ethhdr *veth = (struct vlan_ethhdr *)(skb->data);
+
+	/* Handle non-VLAN frames if they are sent to us, for example by DHCP.
+	 *
+	 * NOTE: THIS ASSUMES DIX ETHERNET, SPECIFICALLY NOT SUPPORTING
+	 * OTHER THINGS LIKE FDDI/TokenRing/802.3 SNAPs...
+	 */
+
+	if (veth->h_vlan_proto != __constant_htons(ETH_P_8021Q)) {
+		int orig_headroom = skb_headroom(skb);
+		unsigned short veth_TCI;
+
+		/* This is not a VLAN frame...but we can fix that! */
+		VLAN_DEV_INFO(dev)->cnt_encap_on_xmit++;
+
+#ifdef VLAN_DEBUG
+		printk(VLAN_DBG "%s: proto to encap: 0x%hx (hbo)\n",
+			__FUNCTION__, htons(veth->h_vlan_proto));
+#endif
+		/* Construct the second two bytes. This field looks something
+		 * like:
+		 * usr_priority: 3 bits	 (high bits)
+		 * CFI		 1 bit
+		 * VLAN ID	 12 bits (low bits)
+		 */
+		veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
+		veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
+
+		skb = __vlan_put_tag(skb, veth_TCI);
+		if (!skb) {
+			stats->tx_dropped++;
+			return 0;
+		}
+
+		if (orig_headroom < VLAN_HLEN) {
+			VLAN_DEV_INFO(dev)->cnt_inc_headroom_on_tx++;
+		}
+	}
+
+#ifdef VLAN_DEBUG
+	printk(VLAN_DBG "%s: about to send skb: %p to dev: %s\n",
+		__FUNCTION__, skb, skb->dev->name);
+	printk(VLAN_DBG "  %2hx.%2hx.%2hx.%2xh.%2hx.%2hx %2hx.%2hx.%2hx.%2hx.%2hx.%2hx %4hx %4hx %4hx\n",
+	       veth->h_dest[0], veth->h_dest[1], veth->h_dest[2], veth->h_dest[3], veth->h_dest[4], veth->h_dest[5],
+	       veth->h_source[0], veth->h_source[1], veth->h_source[2], veth->h_source[3], veth->h_source[4], veth->h_source[5],
+	       veth->h_vlan_proto, veth->h_vlan_TCI, veth->h_vlan_encapsulated_proto);
+#endif
+
+	stats->tx_packets++; /* for statics only */
+	stats->tx_bytes += skb->len;
+
+	skb->dev = VLAN_DEV_INFO(dev)->real_dev;
+	dev_queue_xmit(skb);
+
+	return 0;
+}
+
+int vlan_dev_hwaccel_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct net_device_stats *stats = vlan_dev_get_stats(dev);
+	unsigned short veth_TCI;
+
+	/* Construct the second two bytes. This field looks something
+	 * like:
+	 * usr_priority: 3 bits	 (high bits)
+	 * CFI		 1 bit
+	 * VLAN ID	 12 bits (low bits)
+	 */
+	veth_TCI = VLAN_DEV_INFO(dev)->vlan_id;
+	veth_TCI |= vlan_dev_get_egress_qos_mask(dev, skb);
+	skb = __vlan_hwaccel_put_tag(skb, veth_TCI);
+
+	stats->tx_packets++;
+	stats->tx_bytes += skb->len;
+
+	skb->dev = VLAN_DEV_INFO(dev)->real_dev;
+	dev_queue_xmit(skb);
+
+	return 0;
+}
+
+int vlan_dev_change_mtu(struct net_device *dev, int new_mtu)
+{
+	/* TODO: gotta make sure the underlying layer can handle it,
+	 * maybe an IFF_VLAN_CAPABLE flag for devices?
+	 */
+	if (VLAN_DEV_INFO(dev)->real_dev->mtu < new_mtu)
+		return -ERANGE;
+
+	dev->mtu = new_mtu;
+
+	return 0;
+}
+
+int vlan_dev_set_ingress_priority(char *dev_name, __u32 skb_prio, short vlan_prio)
+{
+	struct net_device *dev = dev_get_by_name(dev_name);
+
+	if (dev) {
+		if (dev->priv_flags & IFF_802_1Q_VLAN) {
+			/* see if a priority mapping exists.. */
+			VLAN_DEV_INFO(dev)->ingress_priority_map[vlan_prio & 0x7] = skb_prio;
+			dev_put(dev);
+			return 0;
+		}
+
+		dev_put(dev);
+	}
+	return -EINVAL;
+}
+
+int vlan_dev_set_egress_priority(char *dev_name, __u32 skb_prio, short vlan_prio)
+{
+	struct net_device *dev = dev_get_by_name(dev_name);
+	struct vlan_priority_tci_mapping *mp = NULL;
+	struct vlan_priority_tci_mapping *np;
+   
+	if (dev) {
+		if (dev->priv_flags & IFF_802_1Q_VLAN) {
+			/* See if a priority mapping exists.. */
+			mp = VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF];
+			while (mp) {
+				if (mp->priority == skb_prio) {
+					mp->vlan_qos = ((vlan_prio << 13) & 0xE000);
+					dev_put(dev);
+					return 0;
+				}
+				mp = mp->next;
+			}
+
+			/* Create a new mapping then. */
+			mp = VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF];
+			np = kmalloc(sizeof(struct vlan_priority_tci_mapping), GFP_KERNEL);
+			if (np) {
+				np->next = mp;
+				np->priority = skb_prio;
+				np->vlan_qos = ((vlan_prio << 13) & 0xE000);
+				VLAN_DEV_INFO(dev)->egress_priority_map[skb_prio & 0xF] = np;
+				dev_put(dev);
+				return 0;
+			} else {
+				dev_put(dev);
+				return -ENOBUFS;
+			}
+		}
+		dev_put(dev);
+	}
+	return -EINVAL;
+}
+
+/* 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 *dev = dev_get_by_name(dev_name);
+
+	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 {
+		printk(KERN_ERR  "%s: Could not find device: %s\n", 
+			__FUNCTION__, dev_name);
+	}
+
+	return -EINVAL;
+}
+
+
+int vlan_dev_get_realdev_name(const char *dev_name, char* result)
+{
+	struct net_device *dev = dev_get_by_name(dev_name);
+	int rv = 0;
+	if (dev) {
+		if (dev->priv_flags & IFF_802_1Q_VLAN) {
+			strncpy(result, VLAN_DEV_INFO(dev)->real_dev->name, 23);
+			rv = 0;
+		} else {
+			rv = -EINVAL;
+		}
+		dev_put(dev);
+	} else {
+		rv = -ENODEV;
+	}
+	return rv;
+}
+
+int vlan_dev_get_vid(const char *dev_name, unsigned short* result)
+{
+	struct net_device *dev = dev_get_by_name(dev_name);
+	int rv = 0;
+	if (dev) {
+		if (dev->priv_flags & IFF_802_1Q_VLAN) {
+			*result = VLAN_DEV_INFO(dev)->vlan_id;
+			rv = 0;
+		} else {
+			rv = -EINVAL;
+		}
+		dev_put(dev);
+	} else {
+		rv = -ENODEV;
+	}
+	return rv;
+}
+
+
+int vlan_dev_set_mac_address(struct net_device *dev, void *addr_struct_p)
+{
+	struct sockaddr *addr = (struct sockaddr *)(addr_struct_p);
+	int i;
+
+	if (netif_running(dev))
+		return -EBUSY;
+
+	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
+
+	printk("%s: Setting MAC address to ", dev->name);
+	for (i = 0; i < 6; i++)
+		printk(" %2.2x", dev->dev_addr[i]);
+	printk(".\n");
+
+	if (memcmp(VLAN_DEV_INFO(dev)->real_dev->dev_addr,
+		   dev->dev_addr,
+		   dev->addr_len) != 0) {
+		if (!(VLAN_DEV_INFO(dev)->real_dev->flags & IFF_PROMISC)) {
+			int flgs = VLAN_DEV_INFO(dev)->real_dev->flags;
+
+			/* Increment our in-use promiscuity counter */
+			dev_set_promiscuity(VLAN_DEV_INFO(dev)->real_dev, 1);
+
+			/* Make PROMISC visible to the user. */
+			flgs |= IFF_PROMISC;
+			printk("VLAN (%s):  Setting underlying device (%s) to promiscious mode.\n",
+			       dev->name, VLAN_DEV_INFO(dev)->real_dev->name);
+			dev_change_flags(VLAN_DEV_INFO(dev)->real_dev, flgs);
+		}
+	} else {
+		printk("VLAN (%s):  Underlying device (%s) has same MAC, not checking promiscious mode.\n",
+		       dev->name, VLAN_DEV_INFO(dev)->real_dev->name);
+	}
+
+	return 0;
+}
+
+static inline int vlan_dmi_equals(struct dev_mc_list *dmi1,
+                                  struct dev_mc_list *dmi2)
+{
+	return ((dmi1->dmi_addrlen == dmi2->dmi_addrlen) &&
+		(memcmp(dmi1->dmi_addr, dmi2->dmi_addr, dmi1->dmi_addrlen) == 0));
+}
+
+/** dmi is a single entry into a dev_mc_list, a single node.  mc_list is
+ *  an entire list, and we'll iterate through it.
+ */
+static int vlan_should_add_mc(struct dev_mc_list *dmi, struct dev_mc_list *mc_list)
+{
+	struct dev_mc_list *idmi;
+
+	for (idmi = mc_list; idmi != NULL; ) {
+		if (vlan_dmi_equals(dmi, idmi)) {
+			if (dmi->dmi_users > idmi->dmi_users)
+				return 1;
+			else
+				return 0;
+		} else {
+			idmi = idmi->next;
+		}
+	}
+
+	return 1;
+}
+
+static inline void vlan_destroy_mc_list(struct dev_mc_list *mc_list)
+{
+	struct dev_mc_list *dmi = mc_list;
+	struct dev_mc_list *next;
+
+	while(dmi) {
+		next = dmi->next;
+		kfree(dmi);
+		dmi = next;
+	}
+}
+
+static void vlan_copy_mc_list(struct dev_mc_list *mc_list, struct vlan_dev_info *vlan_info)
+{
+	struct dev_mc_list *dmi, *new_dmi;
+
+	vlan_destroy_mc_list(vlan_info->old_mc_list);
+	vlan_info->old_mc_list = NULL;
+
+	for (dmi = mc_list; dmi != NULL; dmi = dmi->next) {
+		new_dmi = kmalloc(sizeof(*new_dmi), GFP_ATOMIC);
+		if (new_dmi == NULL) {
+			printk(KERN_ERR "vlan: cannot allocate memory. "
+			       "Multicast may not work properly from now.\n");
+			return;
+		}
+
+		/* Copy whole structure, then make new 'next' pointer */
+		*new_dmi = *dmi;
+		new_dmi->next = vlan_info->old_mc_list;
+		vlan_info->old_mc_list = new_dmi;
+	}
+}
+
+static void vlan_flush_mc_list(struct net_device *dev)
+{
+	struct dev_mc_list *dmi = dev->mc_list;
+
+	while (dmi) {
+		printk(KERN_DEBUG "%s: del %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address from vlan interface\n",
+		       dev->name,
+		       dmi->dmi_addr[0],
+		       dmi->dmi_addr[1],
+		       dmi->dmi_addr[2],
+		       dmi->dmi_addr[3],
+		       dmi->dmi_addr[4],
+		       dmi->dmi_addr[5]);
+		dev_mc_delete(dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+		dmi = dev->mc_list;
+	}
+
+	/* dev->mc_list is NULL by the time we get here. */
+	vlan_destroy_mc_list(VLAN_DEV_INFO(dev)->old_mc_list);
+	VLAN_DEV_INFO(dev)->old_mc_list = NULL;
+}
+
+int vlan_dev_open(struct net_device *dev)
+{
+	if (!(VLAN_DEV_INFO(dev)->real_dev->flags & IFF_UP))
+		return -ENETDOWN;
+
+	return 0;
+}
+
+int vlan_dev_stop(struct net_device *dev)
+{
+	vlan_flush_mc_list(dev);
+	return 0;
+}
+
+int vlan_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
+	struct ifreq ifrr;
+	int err = -EOPNOTSUPP;
+
+	strncpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
+	ifrr.ifr_ifru = ifr->ifr_ifru;
+
+	switch(cmd) {
+	case SIOCGMIIPHY:
+	case SIOCGMIIREG:
+	case SIOCSMIIREG:
+		if (real_dev->do_ioctl && netif_device_present(real_dev)) 
+			err = real_dev->do_ioctl(real_dev, &ifrr, cmd);
+		break;
+
+	case SIOCETHTOOL:
+		err = dev_ethtool(&ifrr);
+	}
+
+	if (!err) 
+		ifr->ifr_ifru = ifrr.ifr_ifru;
+
+	return err;
+}
+
+/** 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)) {
+				dev_mc_add(real_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+				printk(KERN_DEBUG "%s: add %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address to master interface\n",
+				       vlan_dev->name,
+				       dmi->dmi_addr[0],
+				       dmi->dmi_addr[1],
+				       dmi->dmi_addr[2],
+				       dmi->dmi_addr[3],
+				       dmi->dmi_addr[4],
+				       dmi->dmi_addr[5]);
+			}
+		}
+
+		/* looking for addresses to delete from master's list */
+		for (dmi = VLAN_DEV_INFO(vlan_dev)->old_mc_list; dmi != NULL; dmi = dmi->next) {
+			if (vlan_should_add_mc(dmi, vlan_dev->mc_list)) {
+				/* if we think we should add it to the new list, then we should really
+				 * delete it from the real list on the underlying device.
+				 */
+				dev_mc_delete(real_dev, dmi->dmi_addr, dmi->dmi_addrlen, 0);
+				printk(KERN_DEBUG "%s: del %.2x:%.2x:%.2x:%.2x:%.2x:%.2x mcast address from master interface\n",
+				       vlan_dev->name,
+				       dmi->dmi_addr[0],
+				       dmi->dmi_addr[1],
+				       dmi->dmi_addr[2],
+				       dmi->dmi_addr[3],
+				       dmi->dmi_addr[4],
+				       dmi->dmi_addr[5]);
+			}
+		}
+
+		/* save multicast list */
+		vlan_copy_mc_list(vlan_dev->mc_list, VLAN_DEV_INFO(vlan_dev));
+	}
+}