Linux-2.6.12-rc2v2.6.12-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, 824 insertions, 0 deletions

diff --git a/net/atm/br2684.c b/net/atm/br2684.c
new file mode 100644
index 0000000..e6954cf
--- /dev/null
+++ b/net/atm/br2684.c
@@ -0,0 +1,824 @@
+/*
+Experimental ethernet netdevice using ATM AAL5 as underlying carrier
+(RFC1483 obsoleted by RFC2684) for Linux 2.4
+Author: Marcell GAL, 2000, XDSL Ltd, Hungary
+*/
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/ip.h>
+#include <asm/uaccess.h>
+#include <net/arp.h>
+#include <linux/atm.h>
+#include <linux/atmdev.h>
+#include <linux/seq_file.h>
+
+#include <linux/atmbr2684.h>
+
+#include "common.h"
+#include "ipcommon.h"
+
+/*
+ * Define this to use a version of the code which interacts with the higher
+ * layers in a more intellegent way, by always reserving enough space for
+ * our header at the begining of the packet.  However, there may still be
+ * some problems with programs like tcpdump.  In 2.5 we'll sort out what
+ * we need to do to get this perfect.  For now we just will copy the packet
+ * if we need space for the header
+ */
+/* #define FASTER_VERSION */
+
+#ifdef DEBUG
+#define DPRINTK(format, args...) printk(KERN_DEBUG "br2684: " format, ##args)
+#else
+#define DPRINTK(format, args...)
+#endif
+
+#ifdef SKB_DEBUG
+static void skb_debug(const struct sk_buff *skb)
+{
+#define NUM2PRINT 50
+	char buf[NUM2PRINT * 3 + 1];	/* 3 chars per byte */
+	int i = 0;
+	for (i = 0; i < skb->len && i < NUM2PRINT; i++) {
+		sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
+	}
+	printk(KERN_DEBUG "br2684: skb: %s\n", buf);
+}
+#else
+#define skb_debug(skb)	do {} while (0)
+#endif
+
+static unsigned char llc_oui_pid_pad[] =
+    { 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 };
+#define PADLEN	(2)
+
+enum br2684_encaps {
+	e_vc  = BR2684_ENCAPS_VC,
+	e_llc = BR2684_ENCAPS_LLC,
+};
+
+struct br2684_vcc {
+	struct atm_vcc  *atmvcc;
+	struct net_device *device;
+	/* keep old push,pop functions for chaining */
+	void (*old_push)(struct atm_vcc *vcc,struct sk_buff *skb);
+	/* void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); */
+	enum br2684_encaps encaps;
+	struct list_head brvccs;
+#ifdef CONFIG_ATM_BR2684_IPFILTER
+	struct br2684_filter filter;
+#endif /* CONFIG_ATM_BR2684_IPFILTER */
+#ifndef FASTER_VERSION
+	unsigned copies_needed, copies_failed;
+#endif /* FASTER_VERSION */
+};
+
+struct br2684_dev {
+	struct net_device *net_dev;
+	struct list_head br2684_devs;
+	int number;
+	struct list_head brvccs; /* one device <=> one vcc (before xmas) */
+	struct net_device_stats stats;
+	int mac_was_set;
+};
+
+/*
+ * This lock should be held for writing any time the list of devices or
+ * their attached vcc's could be altered.  It should be held for reading
+ * any time these are being queried.  Note that we sometimes need to
+ * do read-locking under interrupt context, so write locking must block
+ * the current CPU's interrupts
+ */
+static DEFINE_RWLOCK(devs_lock);
+
+static LIST_HEAD(br2684_devs);
+
+static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
+{
+	return (struct br2684_dev *) net_dev->priv;
+}
+
+static inline struct net_device *list_entry_brdev(const struct list_head *le)
+{
+	return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
+}
+
+static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
+{
+	return (struct br2684_vcc *) (atmvcc->user_back);
+}
+
+static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
+{
+	return list_entry(le, struct br2684_vcc, brvccs);
+}
+
+/* Caller should hold read_lock(&devs_lock) */
+static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
+{
+	struct list_head *lh;
+	struct net_device *net_dev;
+	switch (s->method) {
+	case BR2684_FIND_BYNUM:
+		list_for_each(lh, &br2684_devs) {
+			net_dev = list_entry_brdev(lh);
+			if (BRPRIV(net_dev)->number == s->spec.devnum)
+				return net_dev;
+		}
+		break;
+	case BR2684_FIND_BYIFNAME:
+		list_for_each(lh, &br2684_devs) {
+			net_dev = list_entry_brdev(lh);
+			if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
+				return net_dev;
+		}
+		break;
+	}
+	return NULL;
+}
+
+/*
+ * Send a packet out a particular vcc.  Not to useful right now, but paves
+ * the way for multiple vcc's per itf.  Returns true if we can send,
+ * otherwise false
+ */
+static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
+	struct br2684_vcc *brvcc)
+{
+	struct atm_vcc *atmvcc;
+#ifdef FASTER_VERSION
+	if (brvcc->encaps == e_llc)
+		memcpy(skb_push(skb, 8), llc_oui_pid_pad, 8);
+	/* last 2 bytes of llc_oui_pid_pad are managed by header routines;
+	   yes, you got it: 8 + 2 = sizeof(llc_oui_pid_pad)
+	 */
+#else
+	int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
+	if (skb_headroom(skb) < minheadroom) {
+		struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
+		brvcc->copies_needed++;
+		dev_kfree_skb(skb);
+		if (skb2 == NULL) {
+			brvcc->copies_failed++;
+			return 0;
+		}
+		skb = skb2;
+	}
+	skb_push(skb, minheadroom);
+	if (brvcc->encaps == e_llc)
+		memcpy(skb->data, llc_oui_pid_pad, 10);
+	else
+		memset(skb->data, 0, 2);
+#endif /* FASTER_VERSION */
+	skb_debug(skb);
+
+	ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
+	DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
+	if (!atm_may_send(atmvcc, skb->truesize)) {
+		/* we free this here for now, because we cannot know in a higher 
+			layer whether the skb point it supplied wasn't freed yet.
+			now, it always is.
+		*/
+		dev_kfree_skb(skb);
+		return 0;
+		}
+	atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
+	ATM_SKB(skb)->atm_options = atmvcc->atm_options;
+	brdev->stats.tx_packets++;
+	brdev->stats.tx_bytes += skb->len;
+	atmvcc->send(atmvcc, skb);
+	return 1;
+}
+
+static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb,
+	struct br2684_dev *brdev)
+{
+	return list_empty(&brdev->brvccs) ? NULL :
+	    list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
+}
+
+static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct br2684_dev *brdev = BRPRIV(dev);
+	struct br2684_vcc *brvcc;
+
+	DPRINTK("br2684_start_xmit, skb->dst=%p\n", skb->dst);
+	read_lock(&devs_lock);
+	brvcc = pick_outgoing_vcc(skb, brdev);
+	if (brvcc == NULL) {
+		DPRINTK("no vcc attached to dev %s\n", dev->name);
+		brdev->stats.tx_errors++;
+		brdev->stats.tx_carrier_errors++;
+		/* netif_stop_queue(dev); */
+		dev_kfree_skb(skb);
+		read_unlock(&devs_lock);
+		return -EUNATCH;
+	}
+	if (!br2684_xmit_vcc(skb, brdev, brvcc)) {
+		/*
+		 * We should probably use netif_*_queue() here, but that
+		 * involves added complication.  We need to walk before
+		 * we can run
+		 */
+		/* don't free here! this pointer might be no longer valid!
+		dev_kfree_skb(skb);
+		*/
+		brdev->stats.tx_errors++;
+		brdev->stats.tx_fifo_errors++;
+	}
+	read_unlock(&devs_lock);
+	return 0;
+}
+
+static struct net_device_stats *br2684_get_stats(struct net_device *dev)
+{
+	DPRINTK("br2684_get_stats\n");
+	return &BRPRIV(dev)->stats;
+}
+
+#ifdef FASTER_VERSION
+/*
+ * These mirror eth_header and eth_header_cache.  They are not usually
+ * exported for use in modules, so we grab them from net_device
+ * after ether_setup() is done with it.  Bit of a hack.
+ */
+static int (*my_eth_header)(struct sk_buff *, struct net_device *,
+	unsigned short, void *, void *, unsigned);
+static int (*my_eth_header_cache)(struct neighbour *, struct hh_cache *);
+
+static int
+br2684_header(struct sk_buff *skb, struct net_device *dev,
+	      unsigned short type, void *daddr, void *saddr, unsigned len)
+{
+	u16 *pad_before_eth;
+	int t = my_eth_header(skb, dev, type, daddr, saddr, len);
+	if (t > 0) {
+		pad_before_eth = (u16 *) skb_push(skb, 2);
+		*pad_before_eth = 0;
+		return dev->hard_header_len;	/* or return 16; ? */
+	} else
+		return t;
+}
+
+static int
+br2684_header_cache(struct neighbour *neigh, struct hh_cache *hh)
+{
+/* hh_data is 16 bytes long. if encaps is ether-llc we need 24, so
+xmit will add the additional header part in that case */
+	u16 *pad_before_eth = (u16 *)(hh->hh_data);
+	int t = my_eth_header_cache(neigh, hh);
+	DPRINTK("br2684_header_cache, neigh=%p, hh_cache=%p\n", neigh, hh);
+	if (t < 0)
+		return t;
+	else {
+		*pad_before_eth = 0;
+		hh->hh_len = PADLEN + ETH_HLEN;
+	}
+	return 0;
+}
+
+/*
+ * This is similar to eth_type_trans, which cannot be used because of
+ * our dev->hard_header_len
+ */
+static inline unsigned short br_type_trans(struct sk_buff *skb,
+					       struct net_device *dev)
+{
+	struct ethhdr *eth;
+	unsigned char *rawp;
+	eth = eth_hdr(skb);
+
+	if (*eth->h_dest & 1) {
+		if (memcmp(eth->h_dest, dev->broadcast, ETH_ALEN) == 0)
+			skb->pkt_type = PACKET_BROADCAST;
+		else
+			skb->pkt_type = PACKET_MULTICAST;
+	}
+
+	else if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN))
+		skb->pkt_type = PACKET_OTHERHOST;
+
+	if (ntohs(eth->h_proto) >= 1536)
+		return eth->h_proto;
+
+	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)
+		return htons(ETH_P_802_3);
+
+	/*
+	 * Real 802.2 LLC
+	 */
+	return htons(ETH_P_802_2);
+}
+#endif /* FASTER_VERSION */
+
+/*
+ * We remember when the MAC gets set, so we don't override it later with
+ * the ESI of the ATM card of the first VC
+ */
+static int (*my_eth_mac_addr)(struct net_device *, void *);
+static int br2684_mac_addr(struct net_device *dev, void *p)
+{
+	int err = my_eth_mac_addr(dev, p);
+	if (!err)
+		BRPRIV(dev)->mac_was_set = 1;
+	return err;
+}
+
+#ifdef CONFIG_ATM_BR2684_IPFILTER
+/* this IOCTL is experimental. */
+static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg)
+{
+	struct br2684_vcc *brvcc;
+	struct br2684_filter_set fs;
+
+	if (copy_from_user(&fs, arg, sizeof fs))
+		return -EFAULT;
+	if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
+		/*
+		 * This is really a per-vcc thing, but we can also search
+		 * by device
+		 */
+		struct br2684_dev *brdev;
+		read_lock(&devs_lock);
+		brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
+		if (brdev == NULL || list_empty(&brdev->brvccs) ||
+		    brdev->brvccs.next != brdev->brvccs.prev)  /* >1 VCC */
+			brvcc = NULL;
+		else
+			brvcc = list_entry_brvcc(brdev->brvccs.next);
+		read_unlock(&devs_lock);
+		if (brvcc == NULL)
+			return -ESRCH;
+	} else
+		brvcc = BR2684_VCC(atmvcc);
+	memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
+	return 0;
+}
+
+/* Returns 1 if packet should be dropped */
+static inline int
+packet_fails_filter(u16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
+{
+	if (brvcc->filter.netmask == 0)
+		return 0;			/* no filter in place */
+	if (type == __constant_htons(ETH_P_IP) &&
+	    (((struct iphdr *) (skb->data))->daddr & brvcc->filter.
+	     netmask) == brvcc->filter.prefix)
+		return 0;
+	if (type == __constant_htons(ETH_P_ARP))
+		return 0;
+	/* TODO: we should probably filter ARPs too.. don't want to have
+	 *   them returning values that don't make sense, or is that ok?
+	 */
+	return 1;		/* drop */
+}
+#endif /* CONFIG_ATM_BR2684_IPFILTER */
+
+static void br2684_close_vcc(struct br2684_vcc *brvcc)
+{
+	DPRINTK("removing VCC %p from dev %p\n", brvcc, brvcc->device);
+	write_lock_irq(&devs_lock);
+	list_del(&brvcc->brvccs);
+	write_unlock_irq(&devs_lock);
+	brvcc->atmvcc->user_back = NULL;	/* what about vcc->recvq ??? */
+	brvcc->old_push(brvcc->atmvcc, NULL);	/* pass on the bad news */
+	kfree(brvcc);
+	module_put(THIS_MODULE);
+}
+
+/* when AAL5 PDU comes in: */
+static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
+{
+	struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
+	struct net_device *net_dev = brvcc->device;
+	struct br2684_dev *brdev = BRPRIV(net_dev);
+	int plen = sizeof(llc_oui_pid_pad) + ETH_HLEN;
+
+	DPRINTK("br2684_push\n");
+
+	if (unlikely(skb == NULL)) {
+		/* skb==NULL means VCC is being destroyed */
+		br2684_close_vcc(brvcc);
+		if (list_empty(&brdev->brvccs)) {
+			read_lock(&devs_lock);
+			list_del(&brdev->br2684_devs);
+			read_unlock(&devs_lock);
+			unregister_netdev(net_dev);
+			free_netdev(net_dev);
+		}
+		return;
+	}
+
+	skb_debug(skb);
+	atm_return(atmvcc, skb->truesize);
+	DPRINTK("skb from brdev %p\n", brdev);
+	if (brvcc->encaps == e_llc) {
+		/* let us waste some time for checking the encapsulation.
+		   Note, that only 7 char is checked so frames with a valid FCS
+		   are also accepted (but FCS is not checked of course) */
+		if (memcmp(skb->data, llc_oui_pid_pad, 7)) {
+			brdev->stats.rx_errors++;
+			dev_kfree_skb(skb);
+			return;
+		}
+
+		/* Strip FCS if present */
+		if (skb->len > 7 && skb->data[7] == 0x01)
+			__skb_trim(skb, skb->len - 4);
+	} else {
+		plen = PADLEN + ETH_HLEN;	/* pad, dstmac,srcmac, ethtype */
+		/* first 2 chars should be 0 */
+		if (*((u16 *) (skb->data)) != 0) {
+			brdev->stats.rx_errors++;
+			dev_kfree_skb(skb);
+			return;
+		}
+	}
+	if (skb->len < plen) {
+		brdev->stats.rx_errors++;
+		dev_kfree_skb(skb);	/* dev_ not needed? */
+		return;
+	}
+
+#ifdef FASTER_VERSION
+	/* FIXME: tcpdump shows that pointer to mac header is 2 bytes earlier,
+	   than should be. What else should I set? */
+	skb_pull(skb, plen);
+	skb->mac.raw = ((char *) (skb->data)) - ETH_HLEN;
+	skb->pkt_type = PACKET_HOST;
+#ifdef CONFIG_BR2684_FAST_TRANS
+	skb->protocol = ((u16 *) skb->data)[-1];
+#else				/* some protocols might require this: */
+	skb->protocol = br_type_trans(skb, net_dev);
+#endif /* CONFIG_BR2684_FAST_TRANS */
+#else
+	skb_pull(skb, plen - ETH_HLEN);
+	skb->protocol = eth_type_trans(skb, net_dev);
+#endif /* FASTER_VERSION */
+#ifdef CONFIG_ATM_BR2684_IPFILTER
+	if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
+		brdev->stats.rx_dropped++;
+		dev_kfree_skb(skb);
+		return;
+	}
+#endif /* CONFIG_ATM_BR2684_IPFILTER */
+	skb->dev = net_dev;
+	ATM_SKB(skb)->vcc = atmvcc;	/* needed ? */
+	DPRINTK("received packet's protocol: %x\n", ntohs(skb->protocol));
+	skb_debug(skb);
+	if (unlikely(!(net_dev->flags & IFF_UP))) {
+		/* sigh, interface is down */
+		brdev->stats.rx_dropped++;
+		dev_kfree_skb(skb);
+		return;
+	}
+	brdev->stats.rx_packets++;
+	brdev->stats.rx_bytes += skb->len;
+	memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
+	netif_rx(skb);
+}
+
+static int br2684_regvcc(struct atm_vcc *atmvcc, void __user *arg)
+{
+/* assign a vcc to a dev
+Note: we do not have explicit unassign, but look at _push()
+*/
+	int err;
+	struct br2684_vcc *brvcc;
+	struct sk_buff_head copy;
+	struct sk_buff *skb;
+	struct br2684_dev *brdev;
+	struct net_device *net_dev;
+	struct atm_backend_br2684 be;
+
+	if (copy_from_user(&be, arg, sizeof be))
+		return -EFAULT;
+	brvcc = kmalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
+	if (!brvcc)
+		return -ENOMEM;
+	memset(brvcc, 0, sizeof(struct br2684_vcc));
+	write_lock_irq(&devs_lock);
+	net_dev = br2684_find_dev(&be.ifspec);
+	if (net_dev == NULL) {
+		printk(KERN_ERR
+		    "br2684: tried to attach to non-existant device\n");
+		err = -ENXIO;
+		goto error;
+	}
+	brdev = BRPRIV(net_dev);
+	if (atmvcc->push == NULL) {
+		err = -EBADFD;
+		goto error;
+	}
+	if (!list_empty(&brdev->brvccs)) {
+		/* Only 1 VCC/dev right now */
+		err = -EEXIST;
+		goto error;
+	}
+	if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
+	    be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
+	    BR2684_ENCAPS_VC && be.encaps != BR2684_ENCAPS_LLC) ||
+	    be.min_size != 0) {
+		err = -EINVAL;
+		goto error;
+	}
+	DPRINTK("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps,
+		brvcc);
+	if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
+		unsigned char *esi = atmvcc->dev->esi;
+		if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
+			memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
+		else
+			net_dev->dev_addr[2] = 1;
+	}
+	list_add(&brvcc->brvccs, &brdev->brvccs);
+	write_unlock_irq(&devs_lock);
+	brvcc->device = net_dev;
+	brvcc->atmvcc = atmvcc;
+	atmvcc->user_back = brvcc;
+	brvcc->encaps = (enum br2684_encaps) be.encaps;
+	brvcc->old_push = atmvcc->push;
+	barrier();
+	atmvcc->push = br2684_push;
+	skb_queue_head_init(&copy);
+	skb_migrate(&sk_atm(atmvcc)->sk_receive_queue, &copy);
+	while ((skb = skb_dequeue(&copy)) != NULL) {
+		BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
+		BRPRIV(skb->dev)->stats.rx_packets--;
+		br2684_push(atmvcc, skb);
+	}
+	__module_get(THIS_MODULE);
+	return 0;
+    error:
+	write_unlock_irq(&devs_lock);
+	kfree(brvcc);
+	return err;
+}
+
+static void br2684_setup(struct net_device *netdev)
+{
+	struct br2684_dev *brdev = BRPRIV(netdev);
+
+	ether_setup(netdev);
+	brdev->net_dev = netdev;
+
+#ifdef FASTER_VERSION
+	my_eth_header = netdev->hard_header;
+	netdev->hard_header = br2684_header;
+	my_eth_header_cache = netdev->hard_header_cache;
+	netdev->hard_header_cache = br2684_header_cache;
+	netdev->hard_header_len = sizeof(llc_oui_pid_pad) + ETH_HLEN;	/* 10 + 14 */
+#endif
+	my_eth_mac_addr = netdev->set_mac_address;
+	netdev->set_mac_address = br2684_mac_addr;
+	netdev->hard_start_xmit = br2684_start_xmit;
+	netdev->get_stats = br2684_get_stats;
+
+	INIT_LIST_HEAD(&brdev->brvccs);
+}
+
+static int br2684_create(void __user *arg)
+{
+	int err;
+	struct net_device *netdev;
+	struct br2684_dev *brdev;
+	struct atm_newif_br2684 ni;
+
+	DPRINTK("br2684_create\n");
+
+	if (copy_from_user(&ni, arg, sizeof ni)) {
+		return -EFAULT;
+	}
+	if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
+		return -EINVAL;
+	}
+
+	netdev = alloc_netdev(sizeof(struct br2684_dev),
+			      ni.ifname[0] ? ni.ifname : "nas%d",
+			      br2684_setup);
+	if (!netdev)
+		return -ENOMEM;
+
+	brdev = BRPRIV(netdev);
+
+	DPRINTK("registered netdev %s\n", netdev->name);
+	/* open, stop, do_ioctl ? */
+	err = register_netdev(netdev);
+	if (err < 0) {
+		printk(KERN_ERR "br2684_create: register_netdev failed\n");
+		free_netdev(netdev);
+		return err;
+	}
+
+	write_lock_irq(&devs_lock);
+	brdev->number = list_empty(&br2684_devs) ? 1 :
+	    BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
+	list_add_tail(&brdev->br2684_devs, &br2684_devs);
+	write_unlock_irq(&devs_lock);
+	return 0;
+}
+
+/*
+ * This handles ioctls actually performed on our vcc - we must return
+ * -ENOIOCTLCMD for any unrecognized ioctl
+ */
+static int br2684_ioctl(struct socket *sock, unsigned int cmd,
+	unsigned long arg)
+{
+	struct atm_vcc *atmvcc = ATM_SD(sock);
+	void __user *argp = (void __user *)arg;
+
+	int err;
+	switch(cmd) {
+	case ATM_SETBACKEND:
+	case ATM_NEWBACKENDIF: {
+		atm_backend_t b;
+		err = get_user(b, (atm_backend_t __user *) argp);
+		if (err)
+			return -EFAULT;
+		if (b != ATM_BACKEND_BR2684)
+			return -ENOIOCTLCMD;
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+		if (cmd == ATM_SETBACKEND)
+			return br2684_regvcc(atmvcc, argp);
+		else
+			return br2684_create(argp);
+		}
+#ifdef CONFIG_ATM_BR2684_IPFILTER
+	case BR2684_SETFILT:
+		if (atmvcc->push != br2684_push)
+			return -ENOIOCTLCMD;
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+		err = br2684_setfilt(atmvcc, argp);
+		return err;
+#endif /* CONFIG_ATM_BR2684_IPFILTER */
+	}
+	return -ENOIOCTLCMD;
+}
+
+static struct atm_ioctl br2684_ioctl_ops = {
+	.owner	= THIS_MODULE,
+	.ioctl	= br2684_ioctl,
+};
+
+
+#ifdef CONFIG_PROC_FS
+static void *br2684_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	loff_t offs = 0;
+	struct br2684_dev *brd;
+
+	read_lock(&devs_lock);
+
+	list_for_each_entry(brd, &br2684_devs, br2684_devs) {
+		if (offs == *pos)
+			return brd;
+		++offs;
+	}
+	return NULL;
+}
+
+static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct br2684_dev *brd = v;
+
+	++*pos;
+
+	brd = list_entry(brd->br2684_devs.next, 
+			 struct br2684_dev, br2684_devs);
+	return (&brd->br2684_devs != &br2684_devs) ? brd : NULL;
+}
+
+static void br2684_seq_stop(struct seq_file *seq, void *v)
+{
+	read_unlock(&devs_lock);
+}
+
+static int br2684_seq_show(struct seq_file *seq, void *v)
+{
+	const struct br2684_dev *brdev = v;
+	const struct net_device *net_dev = brdev->net_dev;
+	const struct br2684_vcc *brvcc;
+
+	seq_printf(seq, "dev %.16s: num=%d, mac=%02X:%02X:"
+		       "%02X:%02X:%02X:%02X (%s)\n", net_dev->name,
+		       brdev->number,
+		       net_dev->dev_addr[0],
+		       net_dev->dev_addr[1],
+		       net_dev->dev_addr[2],
+		       net_dev->dev_addr[3],
+		       net_dev->dev_addr[4],
+		       net_dev->dev_addr[5],
+		       brdev->mac_was_set ? "set" : "auto");
+
+	list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
+		seq_printf(seq, "  vcc %d.%d.%d: encaps=%s"
+#ifndef FASTER_VERSION
+				    ", failed copies %u/%u"
+#endif /* FASTER_VERSION */
+				    "\n", brvcc->atmvcc->dev->number,
+				    brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
+				    (brvcc->encaps == e_llc) ? "LLC" : "VC"
+#ifndef FASTER_VERSION
+				    , brvcc->copies_failed
+				    , brvcc->copies_needed
+#endif /* FASTER_VERSION */
+				    );
+#ifdef CONFIG_ATM_BR2684_IPFILTER
+#define b1(var, byte)	((u8 *) &brvcc->filter.var)[byte]
+#define bs(var)		b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
+			if (brvcc->filter.netmask != 0)
+				seq_printf(seq, "    filter=%d.%d.%d.%d/"
+						"%d.%d.%d.%d\n",
+						bs(prefix), bs(netmask));
+#undef bs
+#undef b1
+#endif /* CONFIG_ATM_BR2684_IPFILTER */
+	}
+	return 0;
+}
+
+static struct seq_operations br2684_seq_ops = {
+	.start = br2684_seq_start,
+	.next  = br2684_seq_next,
+	.stop  = br2684_seq_stop,
+	.show  = br2684_seq_show,
+};
+
+static int br2684_proc_open(struct inode *inode, struct file *file)
+{
+	return seq_open(file, &br2684_seq_ops);
+}
+
+static struct file_operations br2684_proc_ops = {
+	.owner   = THIS_MODULE,
+	.open    = br2684_proc_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = seq_release,
+};
+
+extern struct proc_dir_entry *atm_proc_root;	/* from proc.c */
+#endif
+
+static int __init br2684_init(void)
+{
+#ifdef CONFIG_PROC_FS
+	struct proc_dir_entry *p;
+	if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL)
+		return -ENOMEM;
+	p->proc_fops = &br2684_proc_ops;
+#endif
+	register_atm_ioctl(&br2684_ioctl_ops);
+	return 0;
+}
+
+static void __exit br2684_exit(void)
+{
+	struct net_device *net_dev;
+	struct br2684_dev *brdev;
+	struct br2684_vcc *brvcc;
+	deregister_atm_ioctl(&br2684_ioctl_ops);
+
+#ifdef CONFIG_PROC_FS
+	remove_proc_entry("br2684", atm_proc_root);
+#endif
+
+	while (!list_empty(&br2684_devs)) {
+		net_dev = list_entry_brdev(br2684_devs.next);
+		brdev = BRPRIV(net_dev);
+		while (!list_empty(&brdev->brvccs)) {
+			brvcc = list_entry_brvcc(brdev->brvccs.next);
+			br2684_close_vcc(brvcc);
+		}
+
+		list_del(&brdev->br2684_devs);
+		unregister_netdev(net_dev);
+		free_netdev(net_dev);
+	}
+}
+
+module_init(br2684_init);
+module_exit(br2684_exit);
+
+MODULE_AUTHOR("Marcell GAL");
+MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
+MODULE_LICENSE("GPL");