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 000000000000..e6954cf1459d
--- /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");