[linux-2.6-block.git] / net / atm / br2684.c

/*
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/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/capability.h>
#include <linux/seq_file.h>

#include <linux/atmbr2684.h>

#include "common.h"

#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 */
	unsigned copies_needed, copies_failed;
};

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;
	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)
		skb_copy_to_linear_data(skb, llc_oui_pid_pad, 10);
	else
		memset(skb->data, 0, 2);
	skb_debug(skb);

	ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
	pr_debug("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;

	pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst);
	read_lock(&devs_lock);
	brvcc = pick_outgoing_vcc(skb, brdev);
	if (brvcc == NULL) {
		pr_debug("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 0;
	}
	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)
{
	pr_debug("br2684_get_stats\n");
	return &BRPRIV(dev)->stats;
}


/*
 * 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(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
{
	if (brvcc->filter.netmask == 0)
		return 0;			/* no filter in place */
	if (type == htons(ETH_P_IP) &&
	    (((struct iphdr *) (skb->data))->daddr & brvcc->filter.
	     netmask) == brvcc->filter.prefix)
		return 0;
	if (type == 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)
{
	pr_debug("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;

	pr_debug("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);
	pr_debug("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;
	}

	skb_pull(skb, plen - ETH_HLEN);
	skb->protocol = eth_type_trans(skb, net_dev);
#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 ? */
	pr_debug("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 *skb;
	struct sk_buff_head *rq;
	struct br2684_dev *brdev;
	struct net_device *net_dev;
	struct atm_backend_br2684 be;
	unsigned long flags;

	if (copy_from_user(&be, arg, sizeof be))
		return -EFAULT;
	brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
	if (!brvcc)
		return -ENOMEM;
	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;
	}
	pr_debug("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;

	rq = &sk_atm(atmvcc)->sk_receive_queue;

	spin_lock_irqsave(&rq->lock, flags);
	if (skb_queue_empty(rq)) {
		skb = NULL;
	} else {
		/* NULL terminate the list.  */
		rq->prev->next = NULL;
		skb = rq->next;
	}
	rq->prev = rq->next = (struct sk_buff *)rq;
	rq->qlen = 0;
	spin_unlock_irqrestore(&rq->lock, flags);

	while (skb) {
		struct sk_buff *next = skb->next;

		skb->next = skb->prev = NULL;
		BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
		BRPRIV(skb->dev)->stats.rx_packets--;
		br2684_push(atmvcc, skb);

		skb = next;
	}
	__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;

	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;

	pr_debug("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);

	pr_debug("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)
{
	read_lock(&devs_lock);
	return seq_list_start(&br2684_devs, *pos);
}

static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	return seq_list_next(v, &br2684_devs, pos);
}

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 = list_entry(v, struct br2684_dev,
			br2684_devs);
	const struct net_device *net_dev = brdev->net_dev;
	const struct br2684_vcc *brvcc;
	DECLARE_MAC_BUF(mac);

	seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n",
		   net_dev->name,
		   brdev->number,
		   print_mac(mac, net_dev->dev_addr),
		   brdev->mac_was_set ? "set" : "auto");

	list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
		seq_printf(seq, "  vcc %d.%d.%d: encaps=%s"
				    ", failed copies %u/%u"
				    "\n", brvcc->atmvcc->dev->number,
				    brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
				    (brvcc->encaps == e_llc) ? "LLC" : "VC"
				    , brvcc->copies_failed
				    , brvcc->copies_needed
				    );
#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 const 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 const 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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	Experimental ethernet netdevice using ATM AAL5 as underlying carrier
	3	(RFC1483 obsoleted by RFC2684) for Linux 2.4
	4	Author: Marcell GAL, 2000, XDSL Ltd, Hungary
	5	*/
	6
	7	#include <linux/module.h>
1da177e4 LT	8	#include <linux/init.h>
	9	#include <linux/kernel.h>
	10	#include <linux/list.h>
	11	#include <linux/netdevice.h>
	12	#include <linux/skbuff.h>
	13	#include <linux/etherdevice.h>
	14	#include <linux/rtnetlink.h>
	15	#include <linux/ip.h>
	16	#include <asm/uaccess.h>
	17	#include <net/arp.h>
	18	#include <linux/atm.h>
	19	#include <linux/atmdev.h>
4fc268d2	20	#include <linux/capability.h>
1da177e4 LT	21	#include <linux/seq_file.h>
	22
	23	#include <linux/atmbr2684.h>
	24
	25	#include "common.h"
1da177e4	26
1da177e4 LT	27	#ifdef SKB_DEBUG
	28	static void skb_debug(const struct sk_buff *skb)
	29	{
	30	#define NUM2PRINT 50
	31	char buf[NUM2PRINT * 3 + 1]; /* 3 chars per byte */
	32	int i = 0;
	33	for (i = 0; i < skb->len && i < NUM2PRINT; i++) {
	34	sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]);
	35	}
	36	printk(KERN_DEBUG "br2684: skb: %s\n", buf);
	37	}
	38	#else
	39	#define skb_debug(skb) do {} while (0)
	40	#endif
	41
	42	static unsigned char llc_oui_pid_pad[] =
	43	{ 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 };
	44	#define PADLEN (2)
	45
	46	enum br2684_encaps {
	47	e_vc = BR2684_ENCAPS_VC,
	48	e_llc = BR2684_ENCAPS_LLC,
	49	};
	50
	51	struct br2684_vcc {
	52	struct atm_vcc *atmvcc;
	53	struct net_device *device;
	54	/* keep old push,pop functions for chaining */
	55	void (old_push)(struct atm_vcc vcc,struct sk_buff *skb);
	56	/* void (old_pop)(struct atm_vcc vcc,struct sk_buff skb); /
	57	enum br2684_encaps encaps;
	58	struct list_head brvccs;
	59	#ifdef CONFIG_ATM_BR2684_IPFILTER
	60	struct br2684_filter filter;
	61	#endif /* CONFIG_ATM_BR2684_IPFILTER */
1da177e4	62	unsigned copies_needed, copies_failed;
1da177e4 LT	63	};
	64
	65	struct br2684_dev {
	66	struct net_device *net_dev;
	67	struct list_head br2684_devs;
	68	int number;
	69	struct list_head brvccs; /* one device <=> one vcc (before xmas) */
	70	struct net_device_stats stats;
	71	int mac_was_set;
	72	};
	73
	74	/*
	75	* This lock should be held for writing any time the list of devices or
	76	* their attached vcc's could be altered. It should be held for reading
	77	* any time these are being queried. Note that we sometimes need to
	78	* do read-locking under interrupt context, so write locking must block
	79	* the current CPU's interrupts
	80	*/
	81	static DEFINE_RWLOCK(devs_lock);
	82
	83	static LIST_HEAD(br2684_devs);
	84
	85	static inline struct br2684_dev BRPRIV(const struct net_device net_dev)
	86	{
	87	return (struct br2684_dev *) net_dev->priv;
	88	}
	89
	90	static inline struct net_device list_entry_brdev(const struct list_head le)
	91	{
	92	return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
	93	}
	94
	95	static inline struct br2684_vcc BR2684_VCC(const struct atm_vcc atmvcc)
	96	{
	97	return (struct br2684_vcc *) (atmvcc->user_back);
	98	}
	99
	100	static inline struct br2684_vcc list_entry_brvcc(const struct list_head le)
	101	{
	102	return list_entry(le, struct br2684_vcc, brvccs);
	103	}
	104
	105	/* Caller should hold read_lock(&devs_lock) */
	106	static struct net_device br2684_find_dev(const struct br2684_if_spec s)
	107	{
	108	struct list_head *lh;
	109	struct net_device *net_dev;
	110	switch (s->method) {
	111	case BR2684_FIND_BYNUM:
	112	list_for_each(lh, &br2684_devs) {
	113	net_dev = list_entry_brdev(lh);
	114	if (BRPRIV(net_dev)->number == s->spec.devnum)
	115	return net_dev;
	116	}
	117	break;
	118	case BR2684_FIND_BYIFNAME:
	119	list_for_each(lh, &br2684_devs) {
	120	net_dev = list_entry_brdev(lh);
	121	if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
	122	return net_dev;
	123	}
	124	break;
	125	}
	126	return NULL;
127	}
128
129	/*
130	* Send a packet out a particular vcc. Not to useful right now, but paves
131	* the way for multiple vcc's per itf. Returns true if we can send,
132	* otherwise false
133	*/
134	static int br2684_xmit_vcc(struct sk_buff skb, struct br2684_dev brdev,
135	struct br2684_vcc *brvcc)
136	{
137	struct atm_vcc *atmvcc;
1da177e4 LT	138	int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
	139	if (skb_headroom(skb) < minheadroom) {
	140	struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
	141	brvcc->copies_needed++;
	142	dev_kfree_skb(skb);
	143	if (skb2 == NULL) {
	144	brvcc->copies_failed++;
	145	return 0;
	146	}
	147	skb = skb2;
	148	}
	149	skb_push(skb, minheadroom);
	150	if (brvcc->encaps == e_llc)
27d7ff46	151	skb_copy_to_linear_data(skb, llc_oui_pid_pad, 10);
1da177e4 LT	152	else
1da177e4 LT	153	memset(skb->data, 0, 2);
1da177e4 LT	154	skb_debug(skb);
	155
	156	ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
52240062	157	pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
1da177e4	158	if (!atm_may_send(atmvcc, skb->truesize)) {
f7d57453	159	/* we free this here for now, because we cannot know in a higher
1da177e4 LT	160	layer whether the skb point it supplied wasn't freed yet.
	161	now, it always is.
	162	*/
	163	dev_kfree_skb(skb);
	164	return 0;
	165	}
	166	atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
	167	ATM_SKB(skb)->atm_options = atmvcc->atm_options;
	168	brdev->stats.tx_packets++;
	169	brdev->stats.tx_bytes += skb->len;
	170	atmvcc->send(atmvcc, skb);
	171	return 1;
	172	}
	173
	174	static inline struct br2684_vcc pick_outgoing_vcc(struct sk_buff skb,
	175	struct br2684_dev *brdev)
	176	{
	177	return list_empty(&brdev->brvccs) ? NULL :
	178	list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
	179	}
	180
	181	static int br2684_start_xmit(struct sk_buff skb, struct net_device dev)
	182	{
	183	struct br2684_dev *brdev = BRPRIV(dev);
	184	struct br2684_vcc *brvcc;
	185
52240062	186	pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst);
1da177e4 LT	187	read_lock(&devs_lock);
	188	brvcc = pick_outgoing_vcc(skb, brdev);
	189	if (brvcc == NULL) {
52240062	190	pr_debug("no vcc attached to dev %s\n", dev->name);
1da177e4 LT	191	brdev->stats.tx_errors++;
	192	brdev->stats.tx_carrier_errors++;
	193	/* netif_stop_queue(dev); */
	194	dev_kfree_skb(skb);
	195	read_unlock(&devs_lock);
4f55cd10	196	return 0;
1da177e4 LT	197	}
	198	if (!br2684_xmit_vcc(skb, brdev, brvcc)) {
	199	/*
	200	* We should probably use netif_*_queue() here, but that
	201	* involves added complication. We need to walk before
	202	* we can run
	203	*/
	204	/* don't free here! this pointer might be no longer valid!
	205	dev_kfree_skb(skb);
	206	*/
	207	brdev->stats.tx_errors++;
	208	brdev->stats.tx_fifo_errors++;
	209	}
	210	read_unlock(&devs_lock);
	211	return 0;
	212	}
	213
	214	static struct net_device_stats br2684_get_stats(struct net_device dev)
	215	{
52240062	216	pr_debug("br2684_get_stats\n");
1da177e4 LT	217	return &BRPRIV(dev)->stats;
	218	}
	219
1da177e4 LT	220
	221	/*
	222	* We remember when the MAC gets set, so we don't override it later with
	223	* the ESI of the ATM card of the first VC
	224	*/
	225	static int (my_eth_mac_addr)(struct net_device , void *);
	226	static int br2684_mac_addr(struct net_device dev, void p)
	227	{
	228	int err = my_eth_mac_addr(dev, p);
	229	if (!err)
	230	BRPRIV(dev)->mac_was_set = 1;
	231	return err;
	232	}
	233
	234	#ifdef CONFIG_ATM_BR2684_IPFILTER
	235	/* this IOCTL is experimental. */
	236	static int br2684_setfilt(struct atm_vcc atmvcc, void __user arg)
	237	{
	238	struct br2684_vcc *brvcc;
	239	struct br2684_filter_set fs;
	240
	241	if (copy_from_user(&fs, arg, sizeof fs))
	242	return -EFAULT;
	243	if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
	244	/*
	245	* This is really a per-vcc thing, but we can also search
	246	* by device
	247	*/
	248	struct br2684_dev *brdev;
	249	read_lock(&devs_lock);
	250	brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
	251	if (brdev == NULL \|\| list_empty(&brdev->brvccs) \|\|
	252	brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
	253	brvcc = NULL;
	254	else
	255	brvcc = list_entry_brvcc(brdev->brvccs.next);
	256	read_unlock(&devs_lock);
	257	if (brvcc == NULL)
	258	return -ESRCH;
	259	} else
	260	brvcc = BR2684_VCC(atmvcc);
	261	memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
	262	return 0;
	263	}
	264
	265	/* Returns 1 if packet should be dropped */
	266	static inline int
30d492da	267	packet_fails_filter(__be16 type, struct br2684_vcc brvcc, struct sk_buff skb)
1da177e4 LT	268	{
	269	if (brvcc->filter.netmask == 0)
	270	return 0; /* no filter in place */
acde4855	271	if (type == htons(ETH_P_IP) &&
1da177e4 LT	272	(((struct iphdr *) (skb->data))->daddr & brvcc->filter.
	273	netmask) == brvcc->filter.prefix)
	274	return 0;
acde4855	275	if (type == htons(ETH_P_ARP))
1da177e4 LT	276	return 0;
	277	/* TODO: we should probably filter ARPs too.. don't want to have
	278	* them returning values that don't make sense, or is that ok?
	279	*/
	280	return 1; /* drop */
	281	}
	282	#endif /* CONFIG_ATM_BR2684_IPFILTER */
	283
	284	static void br2684_close_vcc(struct br2684_vcc *brvcc)
	285	{
52240062	286	pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
1da177e4 LT	287	write_lock_irq(&devs_lock);
	288	list_del(&brvcc->brvccs);
	289	write_unlock_irq(&devs_lock);
	290	brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */
	291	brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */
	292	kfree(brvcc);
	293	module_put(THIS_MODULE);
	294	}
	295
	296	/* when AAL5 PDU comes in: */
	297	static void br2684_push(struct atm_vcc atmvcc, struct sk_buff skb)
	298	{
	299	struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
	300	struct net_device *net_dev = brvcc->device;
	301	struct br2684_dev *brdev = BRPRIV(net_dev);
	302	int plen = sizeof(llc_oui_pid_pad) + ETH_HLEN;
	303
52240062	304	pr_debug("br2684_push\n");
1da177e4 LT	305
	306	if (unlikely(skb == NULL)) {
	307	/* skb==NULL means VCC is being destroyed */
	308	br2684_close_vcc(brvcc);
	309	if (list_empty(&brdev->brvccs)) {
	310	read_lock(&devs_lock);
	311	list_del(&brdev->br2684_devs);
	312	read_unlock(&devs_lock);
	313	unregister_netdev(net_dev);
	314	free_netdev(net_dev);
	315	}
	316	return;
	317	}
	318
	319	skb_debug(skb);
	320	atm_return(atmvcc, skb->truesize);
52240062	321	pr_debug("skb from brdev %p\n", brdev);
1da177e4 LT	322	if (brvcc->encaps == e_llc) {
	323	/* let us waste some time for checking the encapsulation.
	324	Note, that only 7 char is checked so frames with a valid FCS
	325	are also accepted (but FCS is not checked of course) */
	326	if (memcmp(skb->data, llc_oui_pid_pad, 7)) {
	327	brdev->stats.rx_errors++;
	328	dev_kfree_skb(skb);
	329	return;
	330	}
	331
	332	/* Strip FCS if present */
	333	if (skb->len > 7 && skb->data[7] == 0x01)
	334	__skb_trim(skb, skb->len - 4);
	335	} else {
	336	plen = PADLEN + ETH_HLEN; /* pad, dstmac,srcmac, ethtype */
	337	/* first 2 chars should be 0 */
	338	if (((u16 ) (skb->data)) != 0) {
	339	brdev->stats.rx_errors++;
	340	dev_kfree_skb(skb);
	341	return;
	342	}
	343	}
	344	if (skb->len < plen) {
	345	brdev->stats.rx_errors++;
	346	dev_kfree_skb(skb); /* dev_ not needed? */
	347	return;
	348	}
	349
1da177e4 LT	350	skb_pull(skb, plen - ETH_HLEN);
1da177e4 LT	351	skb->protocol = eth_type_trans(skb, net_dev);
1da177e4 LT	352	#ifdef CONFIG_ATM_BR2684_IPFILTER
	353	if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
	354	brdev->stats.rx_dropped++;
	355	dev_kfree_skb(skb);
	356	return;
	357	}
	358	#endif /* CONFIG_ATM_BR2684_IPFILTER */
	359	skb->dev = net_dev;
	360	ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
52240062	361	pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
1da177e4 LT	362	skb_debug(skb);
	363	if (unlikely(!(net_dev->flags & IFF_UP))) {
	364	/* sigh, interface is down */
	365	brdev->stats.rx_dropped++;
	366	dev_kfree_skb(skb);
	367	return;
	368	}
	369	brdev->stats.rx_packets++;
	370	brdev->stats.rx_bytes += skb->len;
	371	memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
	372	netif_rx(skb);
	373	}
	374
	375	static int br2684_regvcc(struct atm_vcc atmvcc, void __user arg)
	376	{
	377	/* assign a vcc to a dev
	378	Note: we do not have explicit unassign, but look at _push()
	379	*/
	380	int err;
	381	struct br2684_vcc *brvcc;
1da177e4	382	struct sk_buff *skb;
c40a27f4	383	struct sk_buff_head *rq;
1da177e4 LT	384	struct br2684_dev *brdev;
	385	struct net_device *net_dev;
	386	struct atm_backend_br2684 be;
c40a27f4	387	unsigned long flags;
1da177e4 LT	388
	389	if (copy_from_user(&be, arg, sizeof be))
	390	return -EFAULT;
0da974f4	391	brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
1da177e4 LT	392	if (!brvcc)
1da177e4 LT	393	return -ENOMEM;
1da177e4 LT	394	write_lock_irq(&devs_lock);
	395	net_dev = br2684_find_dev(&be.ifspec);
	396	if (net_dev == NULL) {
	397	printk(KERN_ERR
	398	"br2684: tried to attach to non-existant device\n");
	399	err = -ENXIO;
	400	goto error;
	401	}
	402	brdev = BRPRIV(net_dev);
	403	if (atmvcc->push == NULL) {
	404	err = -EBADFD;
	405	goto error;
	406	}
	407	if (!list_empty(&brdev->brvccs)) {
	408	/* Only 1 VCC/dev right now */
	409	err = -EEXIST;
	410	goto error;
	411	}
	412	if (be.fcs_in != BR2684_FCSIN_NO \|\| be.fcs_out != BR2684_FCSOUT_NO \|\|
	413	be.fcs_auto \|\| be.has_vpiid \|\| be.send_padding \|\| (be.encaps !=
	414	BR2684_ENCAPS_VC && be.encaps != BR2684_ENCAPS_LLC) \|\|
	415	be.min_size != 0) {
	416	err = -EINVAL;
	417	goto error;
	418	}
52240062	419	pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps,
1da177e4 LT	420	brvcc);
	421	if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
	422	unsigned char *esi = atmvcc->dev->esi;
	423	if (esi[0] \| esi[1] \| esi[2] \| esi[3] \| esi[4] \| esi[5])
	424	memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
	425	else
	426	net_dev->dev_addr[2] = 1;
	427	}
	428	list_add(&brvcc->brvccs, &brdev->brvccs);
	429	write_unlock_irq(&devs_lock);
	430	brvcc->device = net_dev;
	431	brvcc->atmvcc = atmvcc;
	432	atmvcc->user_back = brvcc;
	433	brvcc->encaps = (enum br2684_encaps) be.encaps;
	434	brvcc->old_push = atmvcc->push;
	435	barrier();
	436	atmvcc->push = br2684_push;
c40a27f4 DM	437
	438	rq = &sk_atm(atmvcc)->sk_receive_queue;
	439
	440	spin_lock_irqsave(&rq->lock, flags);
	441	if (skb_queue_empty(rq)) {
	442	skb = NULL;
	443	} else {
	444	/* NULL terminate the list. */
	445	rq->prev->next = NULL;
	446	skb = rq->next;
	447	}
	448	rq->prev = rq->next = (struct sk_buff *)rq;
	449	rq->qlen = 0;
	450	spin_unlock_irqrestore(&rq->lock, flags);
	451
	452	while (skb) {
	453	struct sk_buff *next = skb->next;
	454
	455	skb->next = skb->prev = NULL;
1da177e4 LT	456	BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
	457	BRPRIV(skb->dev)->stats.rx_packets--;
	458	br2684_push(atmvcc, skb);
c40a27f4 DM	459
c40a27f4 DM	460	skb = next;
1da177e4 LT	461	}
	462	__module_get(THIS_MODULE);
	463	return 0;
	464	error:
	465	write_unlock_irq(&devs_lock);
	466	kfree(brvcc);
	467	return err;
	468	}
	469
	470	static void br2684_setup(struct net_device *netdev)
	471	{
	472	struct br2684_dev *brdev = BRPRIV(netdev);
	473
	474	ether_setup(netdev);
	475	brdev->net_dev = netdev;
	476
1da177e4 LT	477	my_eth_mac_addr = netdev->set_mac_address;
	478	netdev->set_mac_address = br2684_mac_addr;
	479	netdev->hard_start_xmit = br2684_start_xmit;
	480	netdev->get_stats = br2684_get_stats;
	481
	482	INIT_LIST_HEAD(&brdev->brvccs);
	483	}
	484
	485	static int br2684_create(void __user *arg)
	486	{
	487	int err;
	488	struct net_device *netdev;
	489	struct br2684_dev *brdev;
	490	struct atm_newif_br2684 ni;
	491
52240062	492	pr_debug("br2684_create\n");
1da177e4 LT	493
	494	if (copy_from_user(&ni, arg, sizeof ni)) {
	495	return -EFAULT;
	496	}
	497	if (ni.media != BR2684_MEDIA_ETHERNET \|\| ni.mtu != 1500) {
	498	return -EINVAL;
	499	}
	500
	501	netdev = alloc_netdev(sizeof(struct br2684_dev),
	502	ni.ifname[0] ? ni.ifname : "nas%d",
	503	br2684_setup);
	504	if (!netdev)
	505	return -ENOMEM;
	506
	507	brdev = BRPRIV(netdev);
	508
52240062	509	pr_debug("registered netdev %s\n", netdev->name);
1da177e4 LT	510	/* open, stop, do_ioctl ? */
	511	err = register_netdev(netdev);
	512	if (err < 0) {
	513	printk(KERN_ERR "br2684_create: register_netdev failed\n");
	514	free_netdev(netdev);
	515	return err;
	516	}
	517
	518	write_lock_irq(&devs_lock);
	519	brdev->number = list_empty(&br2684_devs) ? 1 :
	520	BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
	521	list_add_tail(&brdev->br2684_devs, &br2684_devs);
	522	write_unlock_irq(&devs_lock);
	523	return 0;
	524	}
	525
	526	/*
	527	* This handles ioctls actually performed on our vcc - we must return
	528	* -ENOIOCTLCMD for any unrecognized ioctl
	529	*/
	530	static int br2684_ioctl(struct socket *sock, unsigned int cmd,
	531	unsigned long arg)
	532	{
	533	struct atm_vcc *atmvcc = ATM_SD(sock);
	534	void __user argp = (void __user )arg;
	535
	536	int err;
	537	switch(cmd) {
	538	case ATM_SETBACKEND:
	539	case ATM_NEWBACKENDIF: {
	540	atm_backend_t b;
	541	err = get_user(b, (atm_backend_t __user *) argp);
	542	if (err)
	543	return -EFAULT;
	544	if (b != ATM_BACKEND_BR2684)
	545	return -ENOIOCTLCMD;
	546	if (!capable(CAP_NET_ADMIN))
	547	return -EPERM;
	548	if (cmd == ATM_SETBACKEND)
	549	return br2684_regvcc(atmvcc, argp);
	550	else
	551	return br2684_create(argp);
	552	}
	553	#ifdef CONFIG_ATM_BR2684_IPFILTER
	554	case BR2684_SETFILT:
	555	if (atmvcc->push != br2684_push)
	556	return -ENOIOCTLCMD;
	557	if (!capable(CAP_NET_ADMIN))
	558	return -EPERM;
	559	err = br2684_setfilt(atmvcc, argp);
	560	return err;
	561	#endif /* CONFIG_ATM_BR2684_IPFILTER */
	562	}
	563	return -ENOIOCTLCMD;
	564	}
	565
	566	static struct atm_ioctl br2684_ioctl_ops = {
	567	.owner = THIS_MODULE,
	568	.ioctl = br2684_ioctl,
	569	};
	570
	571
	572	#ifdef CONFIG_PROC_FS
	573	static void br2684_seq_start(struct seq_file seq, loff_t *pos)
574	{
1da177e4	575	read_lock(&devs_lock);
9af97186	576	return seq_list_start(&br2684_devs, *pos);
1da177e4 LT	577	}
	578
	579	static void br2684_seq_next(struct seq_file seq, void v, loff_t pos)
	580	{
9af97186	581	return seq_list_next(v, &br2684_devs, pos);
1da177e4 LT	582	}
	583
	584	static void br2684_seq_stop(struct seq_file seq, void v)
	585	{
	586	read_unlock(&devs_lock);
	587	}
	588
	589	static int br2684_seq_show(struct seq_file seq, void v)
	590	{
9af97186 PE	591	const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
9af97186 PE	592	br2684_devs);
1da177e4 LT	593	const struct net_device *net_dev = brdev->net_dev;
1da177e4 LT	594	const struct br2684_vcc *brvcc;
0795af57	595	DECLARE_MAC_BUF(mac);
1da177e4	596
0795af57 JP	597	seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n",
	598	net_dev->name,
	599	brdev->number,
	600	print_mac(mac, net_dev->dev_addr),
	601	brdev->mac_was_set ? "set" : "auto");
1da177e4 LT	602
	603	list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
	604	seq_printf(seq, " vcc %d.%d.%d: encaps=%s"
1da177e4	605	", failed copies %u/%u"
1da177e4 LT	606	"\n", brvcc->atmvcc->dev->number,
	607	brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
	608	(brvcc->encaps == e_llc) ? "LLC" : "VC"
1da177e4 LT	609	, brvcc->copies_failed
1da177e4 LT	610	, brvcc->copies_needed
1da177e4 LT	611	);
	612	#ifdef CONFIG_ATM_BR2684_IPFILTER
	613	#define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte]
	614	#define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
	615	if (brvcc->filter.netmask != 0)
	616	seq_printf(seq, " filter=%d.%d.%d.%d/"
	617	"%d.%d.%d.%d\n",
	618	bs(prefix), bs(netmask));
	619	#undef bs
	620	#undef b1
	621	#endif /* CONFIG_ATM_BR2684_IPFILTER */
	622	}
	623	return 0;
	624	}
	625
56b3d975	626	static const struct seq_operations br2684_seq_ops = {
1da177e4 LT	627	.start = br2684_seq_start,
	628	.next = br2684_seq_next,
	629	.stop = br2684_seq_stop,
	630	.show = br2684_seq_show,
	631	};
	632
	633	static int br2684_proc_open(struct inode inode, struct file file)
	634	{
	635	return seq_open(file, &br2684_seq_ops);
	636	}
	637
9a32144e	638	static const struct file_operations br2684_proc_ops = {
1da177e4 LT	639	.owner = THIS_MODULE,
	640	.open = br2684_proc_open,
	641	.read = seq_read,
	642	.llseek = seq_lseek,
	643	.release = seq_release,
	644	};
	645
	646	extern struct proc_dir_entry atm_proc_root; / from proc.c */
	647	#endif
	648
	649	static int __init br2684_init(void)
	650	{
	651	#ifdef CONFIG_PROC_FS
	652	struct proc_dir_entry *p;
	653	if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL)
	654	return -ENOMEM;
	655	p->proc_fops = &br2684_proc_ops;
	656	#endif
	657	register_atm_ioctl(&br2684_ioctl_ops);
	658	return 0;
	659	}
	660
	661	static void __exit br2684_exit(void)
	662	{
	663	struct net_device *net_dev;
	664	struct br2684_dev *brdev;
	665	struct br2684_vcc *brvcc;
	666	deregister_atm_ioctl(&br2684_ioctl_ops);
	667
	668	#ifdef CONFIG_PROC_FS
	669	remove_proc_entry("br2684", atm_proc_root);
	670	#endif
	671
	672	while (!list_empty(&br2684_devs)) {
	673	net_dev = list_entry_brdev(br2684_devs.next);
	674	brdev = BRPRIV(net_dev);
	675	while (!list_empty(&brdev->brvccs)) {
	676	brvcc = list_entry_brvcc(brdev->brvccs.next);
	677	br2684_close_vcc(brvcc);
	678	}
	679
	680	list_del(&brdev->br2684_devs);
	681	unregister_netdev(net_dev);
	682	free_netdev(net_dev);
	683	}
	684	}
	685
	686	module_init(br2684_init);
	687	module_exit(br2684_exit);
	688
	689	MODULE_AUTHOR("Marcell GAL");
	690	MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
	691	MODULE_LICENSE("GPL");