1/*
  2 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
  4 * James Leu (jleu@mindspring.net).
  5 * Copyright (C) 2001 by various other people who didn't put their name here.
  6 * Licensed under the GPL.
  7 */
  8
  9#include <linux/bootmem.h>
 10#include <linux/etherdevice.h>
 11#include <linux/ethtool.h>
 12#include <linux/inetdevice.h>
 13#include <linux/init.h>
 14#include <linux/list.h>
 15#include <linux/netdevice.h>
 16#include <linux/platform_device.h>
 17#include <linux/rtnetlink.h>
 18#include <linux/skbuff.h>
 19#include <linux/slab.h>
 20#include <linux/spinlock.h>
 21#include <init.h>
 22#include <irq_kern.h>
 23#include <irq_user.h>
 24#include "mconsole_kern.h"
 25#include <net_kern.h>
 26#include <net_user.h>
 27
 28#define DRIVER_NAME "uml-netdev"
 29
 30static DEFINE_SPINLOCK(opened_lock);
 31static LIST_HEAD(opened);
 32
 33/*
 34 * The drop_skb is used when we can't allocate an skb.  The
 35 * packet is read into drop_skb in order to get the data off the
 36 * connection to the host.
 37 * It is reallocated whenever a maximum packet size is seen which is
 38 * larger than any seen before.  update_drop_skb is called from
 39 * eth_configure when a new interface is added.
 40 */
 41static DEFINE_SPINLOCK(drop_lock);
 42static struct sk_buff *drop_skb;
 43static int drop_max;
 44
 45static int update_drop_skb(int max)
 46{
 47	struct sk_buff *new;
 48	unsigned long flags;
 49	int err = 0;
 50
 51	spin_lock_irqsave(&drop_lock, flags);
 52
 53	if (max <= drop_max)
 54		goto out;
 55
 56	err = -ENOMEM;
 57	new = dev_alloc_skb(max);
 58	if (new == NULL)
 59		goto out;
 60
 61	skb_put(new, max);
 62
 63	kfree_skb(drop_skb);
 64	drop_skb = new;
 65	drop_max = max;
 66	err = 0;
 67out:
 68	spin_unlock_irqrestore(&drop_lock, flags);
 69
 70	return err;
 71}
 72
 73static int uml_net_rx(struct net_device *dev)
 74{
 75	struct uml_net_private *lp = netdev_priv(dev);
 76	int pkt_len;
 77	struct sk_buff *skb;
 78
 79	/* If we can't allocate memory, try again next round. */
 80	skb = dev_alloc_skb(lp->max_packet);
 81	if (skb == NULL) {
 82		drop_skb->dev = dev;
 83		/* Read a packet into drop_skb and don't do anything with it. */
 84		(*lp->read)(lp->fd, drop_skb, lp);
 85		dev->stats.rx_dropped++;
 86		return 0;
 87	}
 88
 89	skb->dev = dev;
 90	skb_put(skb, lp->max_packet);
 91	skb_reset_mac_header(skb);
 92	pkt_len = (*lp->read)(lp->fd, skb, lp);
 93
 94	if (pkt_len > 0) {
 95		skb_trim(skb, pkt_len);
 96		skb->protocol = (*lp->protocol)(skb);
 97
 98		dev->stats.rx_bytes += skb->len;
 99		dev->stats.rx_packets++;
100		netif_rx(skb);
101		return pkt_len;
102	}
103
104	kfree_skb(skb);
105	return pkt_len;
106}
107
108static void uml_dev_close(struct work_struct *work)
109{
110	struct uml_net_private *lp =
111		container_of(work, struct uml_net_private, work);
112	dev_close(lp->dev);
113}
114
115static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
116{
117	struct net_device *dev = dev_id;
118	struct uml_net_private *lp = netdev_priv(dev);
119	int err;
120
121	if (!netif_running(dev))
122		return IRQ_NONE;
123
124	spin_lock(&lp->lock);
125	while ((err = uml_net_rx(dev)) > 0) ;
126	if (err < 0) {
127		printk(KERN_ERR
128		       "Device '%s' read returned %d, shutting it down\n",
129		       dev->name, err);
130		/* dev_close can't be called in interrupt context, and takes
131		 * again lp->lock.
132		 * And dev_close() can be safely called multiple times on the
133		 * same device, since it tests for (dev->flags & IFF_UP). So
134		 * there's no harm in delaying the device shutdown.
135		 * Furthermore, the workqueue will not re-enqueue an already
136		 * enqueued work item. */
137		schedule_work(&lp->work);
138		goto out;
139	}
140	reactivate_fd(lp->fd, UM_ETH_IRQ);
141
142out:
143	spin_unlock(&lp->lock);
144	return IRQ_HANDLED;
145}
146
147static int uml_net_open(struct net_device *dev)
148{
149	struct uml_net_private *lp = netdev_priv(dev);
150	int err;
151
152	if (lp->fd >= 0) {
153		err = -ENXIO;
154		goto out;
155	}
156
157	lp->fd = (*lp->open)(&lp->user);
158	if (lp->fd < 0) {
159		err = lp->fd;
160		goto out;
161	}
162
163	err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
164			     IRQF_SHARED, dev->name, dev);
165	if (err != 0) {
166		printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
167		err = -ENETUNREACH;
168		goto out_close;
169	}
170
171	lp->tl.data = (unsigned long) &lp->user;
172	netif_start_queue(dev);
173
174	/* clear buffer - it can happen that the host side of the interface
175	 * is full when we get here.  In this case, new data is never queued,
176	 * SIGIOs never arrive, and the net never works.
177	 */
178	while ((err = uml_net_rx(dev)) > 0) ;
179
180	spin_lock(&opened_lock);
181	list_add(&lp->list, &opened);
182	spin_unlock(&opened_lock);
183
184	return 0;
185out_close:
186	if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
187	lp->fd = -1;
188out:
189	return err;
190}
191
192static int uml_net_close(struct net_device *dev)
193{
194	struct uml_net_private *lp = netdev_priv(dev);
195
196	netif_stop_queue(dev);
197
198	um_free_irq(dev->irq, dev);
199	if (lp->close != NULL)
200		(*lp->close)(lp->fd, &lp->user);
201	lp->fd = -1;
202
203	spin_lock(&opened_lock);
204	list_del(&lp->list);
205	spin_unlock(&opened_lock);
206
207	return 0;
208}
209
210static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
211{
212	struct uml_net_private *lp = netdev_priv(dev);
213	unsigned long flags;
214	int len;
215
216	netif_stop_queue(dev);
217
218	spin_lock_irqsave(&lp->lock, flags);
219
220	len = (*lp->write)(lp->fd, skb, lp);
221	skb_tx_timestamp(skb);
222
223	if (len == skb->len) {
224		dev->stats.tx_packets++;
225		dev->stats.tx_bytes += skb->len;
226		netif_trans_update(dev);
227		netif_start_queue(dev);
228
229		/* this is normally done in the interrupt when tx finishes */
230		netif_wake_queue(dev);
231	}
232	else if (len == 0) {
233		netif_start_queue(dev);
234		dev->stats.tx_dropped++;
235	}
236	else {
237		netif_start_queue(dev);
238		printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
239	}
240
241	spin_unlock_irqrestore(&lp->lock, flags);
242
243	dev_consume_skb_any(skb);
244
245	return NETDEV_TX_OK;
246}
247
248static void uml_net_set_multicast_list(struct net_device *dev)
249{
250	return;
251}
252
253static void uml_net_tx_timeout(struct net_device *dev)
254{
255	netif_trans_update(dev);
256	netif_wake_queue(dev);
257}
258
259#ifdef CONFIG_NET_POLL_CONTROLLER
260static void uml_net_poll_controller(struct net_device *dev)
261{
262	disable_irq(dev->irq);
263	uml_net_interrupt(dev->irq, dev);
264	enable_irq(dev->irq);
265}
266#endif
267
268static void uml_net_get_drvinfo(struct net_device *dev,
269				struct ethtool_drvinfo *info)
270{
271	strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
272	strlcpy(info->version, "42", sizeof(info->version));
273}
274
275static const struct ethtool_ops uml_net_ethtool_ops = {
276	.get_drvinfo	= uml_net_get_drvinfo,
277	.get_link	= ethtool_op_get_link,
278	.get_ts_info	= ethtool_op_get_ts_info,
279};
280
281static void uml_net_user_timer_expire(unsigned long _conn)
282{
283#ifdef undef
284	struct connection *conn = (struct connection *)_conn;
 
285
286	dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
287	do_connect(conn);
288#endif
289}
290
291static void setup_etheraddr(struct net_device *dev, char *str)
292{
293	unsigned char *addr = dev->dev_addr;
294	char *end;
295	int i;
296
297	if (str == NULL)
298		goto random;
299
300	for (i = 0; i < 6; i++) {
301		addr[i] = simple_strtoul(str, &end, 16);
302		if ((end == str) ||
303		   ((*end != ':') && (*end != ',') && (*end != '\0'))) {
304			printk(KERN_ERR
305			       "setup_etheraddr: failed to parse '%s' "
306			       "as an ethernet address\n", str);
307			goto random;
308		}
309		str = end + 1;
310	}
311	if (is_multicast_ether_addr(addr)) {
312		printk(KERN_ERR
313		       "Attempt to assign a multicast ethernet address to a "
314		       "device disallowed\n");
315		goto random;
316	}
317	if (!is_valid_ether_addr(addr)) {
318		printk(KERN_ERR
319		       "Attempt to assign an invalid ethernet address to a "
320		       "device disallowed\n");
321		goto random;
322	}
323	if (!is_local_ether_addr(addr)) {
324		printk(KERN_WARNING
325		       "Warning: Assigning a globally valid ethernet "
326		       "address to a device\n");
327		printk(KERN_WARNING "You should set the 2nd rightmost bit in "
328		       "the first byte of the MAC,\n");
329		printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
330		       addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
331		       addr[5]);
332	}
333	return;
334
335random:
336	printk(KERN_INFO
337	       "Choosing a random ethernet address for device %s\n", dev->name);
338	eth_hw_addr_random(dev);
339}
340
341static DEFINE_SPINLOCK(devices_lock);
342static LIST_HEAD(devices);
343
344static struct platform_driver uml_net_driver = {
345	.driver = {
346		.name  = DRIVER_NAME,
347	},
348};
349
350static void net_device_release(struct device *dev)
351{
352	struct uml_net *device = dev_get_drvdata(dev);
353	struct net_device *netdev = device->dev;
354	struct uml_net_private *lp = netdev_priv(netdev);
355
356	if (lp->remove != NULL)
357		(*lp->remove)(&lp->user);
358	list_del(&device->list);
359	kfree(device);
360	free_netdev(netdev);
361}
362
363static const struct net_device_ops uml_netdev_ops = {
364	.ndo_open 		= uml_net_open,
365	.ndo_stop 		= uml_net_close,
366	.ndo_start_xmit 	= uml_net_start_xmit,
367	.ndo_set_rx_mode	= uml_net_set_multicast_list,
368	.ndo_tx_timeout 	= uml_net_tx_timeout,
369	.ndo_set_mac_address	= eth_mac_addr,
370	.ndo_validate_addr	= eth_validate_addr,
371#ifdef CONFIG_NET_POLL_CONTROLLER
372	.ndo_poll_controller = uml_net_poll_controller,
373#endif
374};
375
376/*
377 * Ensures that platform_driver_register is called only once by
378 * eth_configure.  Will be set in an initcall.
379 */
380static int driver_registered;
381
382static void eth_configure(int n, void *init, char *mac,
383			  struct transport *transport, gfp_t gfp_mask)
384{
385	struct uml_net *device;
386	struct net_device *dev;
387	struct uml_net_private *lp;
388	int err, size;
389
390	size = transport->private_size + sizeof(struct uml_net_private);
391
392	device = kzalloc(sizeof(*device), gfp_mask);
393	if (device == NULL) {
394		printk(KERN_ERR "eth_configure failed to allocate struct "
395		       "uml_net\n");
396		return;
397	}
398
399	dev = alloc_etherdev(size);
400	if (dev == NULL) {
401		printk(KERN_ERR "eth_configure: failed to allocate struct "
402		       "net_device for eth%d\n", n);
403		goto out_free_device;
404	}
405
406	INIT_LIST_HEAD(&device->list);
407	device->index = n;
408
409	/* If this name ends up conflicting with an existing registered
410	 * netdevice, that is OK, register_netdev{,ice}() will notice this
411	 * and fail.
412	 */
413	snprintf(dev->name, sizeof(dev->name), "eth%d", n);
414
415	setup_etheraddr(dev, mac);
416
417	printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
418
419	lp = netdev_priv(dev);
420	/* This points to the transport private data. It's still clear, but we
421	 * must memset it to 0 *now*. Let's help the drivers. */
422	memset(lp, 0, size);
423	INIT_WORK(&lp->work, uml_dev_close);
424
425	/* sysfs register */
426	if (!driver_registered) {
427		platform_driver_register(&uml_net_driver);
428		driver_registered = 1;
429	}
430	device->pdev.id = n;
431	device->pdev.name = DRIVER_NAME;
432	device->pdev.dev.release = net_device_release;
433	dev_set_drvdata(&device->pdev.dev, device);
434	if (platform_device_register(&device->pdev))
435		goto out_free_netdev;
436	SET_NETDEV_DEV(dev,&device->pdev.dev);
437
438	device->dev = dev;
439
440	/*
441	 * These just fill in a data structure, so there's no failure
442	 * to be worried about.
443	 */
444	(*transport->kern->init)(dev, init);
445
446	*lp = ((struct uml_net_private)
447		{ .list  		= LIST_HEAD_INIT(lp->list),
448		  .dev 			= dev,
449		  .fd 			= -1,
450		  .mac 			= { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
451		  .max_packet		= transport->user->max_packet,
452		  .protocol 		= transport->kern->protocol,
453		  .open 		= transport->user->open,
454		  .close 		= transport->user->close,
455		  .remove 		= transport->user->remove,
456		  .read 		= transport->kern->read,
457		  .write 		= transport->kern->write,
458		  .add_address 		= transport->user->add_address,
459		  .delete_address  	= transport->user->delete_address });
460
461	init_timer(&lp->tl);
462	spin_lock_init(&lp->lock);
463	lp->tl.function = uml_net_user_timer_expire;
464	memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
465
466	if ((transport->user->init != NULL) &&
467	    ((*transport->user->init)(&lp->user, dev) != 0))
468		goto out_unregister;
469
470	dev->mtu = transport->user->mtu;
471	dev->netdev_ops = &uml_netdev_ops;
472	dev->ethtool_ops = &uml_net_ethtool_ops;
473	dev->watchdog_timeo = (HZ >> 1);
474	dev->irq = UM_ETH_IRQ;
475
476	err = update_drop_skb(lp->max_packet);
477	if (err)
478		goto out_undo_user_init;
479
480	rtnl_lock();
481	err = register_netdevice(dev);
482	rtnl_unlock();
483	if (err)
484		goto out_undo_user_init;
485
486	spin_lock(&devices_lock);
487	list_add(&device->list, &devices);
488	spin_unlock(&devices_lock);
489
490	return;
491
492out_undo_user_init:
493	if (transport->user->remove != NULL)
494		(*transport->user->remove)(&lp->user);
495out_unregister:
496	platform_device_unregister(&device->pdev);
497	return; /* platform_device_unregister frees dev and device */
498out_free_netdev:
499	free_netdev(dev);
500out_free_device:
501	kfree(device);
502}
503
504static struct uml_net *find_device(int n)
505{
506	struct uml_net *device;
507	struct list_head *ele;
508
509	spin_lock(&devices_lock);
510	list_for_each(ele, &devices) {
511		device = list_entry(ele, struct uml_net, list);
512		if (device->index == n)
513			goto out;
514	}
515	device = NULL;
516 out:
517	spin_unlock(&devices_lock);
518	return device;
519}
520
521static int eth_parse(char *str, int *index_out, char **str_out,
522		     char **error_out)
523{
524	char *end;
525	int n, err = -EINVAL;
526
527	n = simple_strtoul(str, &end, 0);
528	if (end == str) {
529		*error_out = "Bad device number";
530		return err;
531	}
532
533	str = end;
534	if (*str != '=') {
535		*error_out = "Expected '=' after device number";
536		return err;
537	}
538
539	str++;
540	if (find_device(n)) {
541		*error_out = "Device already configured";
542		return err;
543	}
544
545	*index_out = n;
546	*str_out = str;
547	return 0;
548}
549
550struct eth_init {
551	struct list_head list;
552	char *init;
553	int index;
554};
555
556static DEFINE_SPINLOCK(transports_lock);
557static LIST_HEAD(transports);
558
559/* Filled in during early boot */
560static LIST_HEAD(eth_cmd_line);
561
562static int check_transport(struct transport *transport, char *eth, int n,
563			   void **init_out, char **mac_out, gfp_t gfp_mask)
564{
565	int len;
566
567	len = strlen(transport->name);
568	if (strncmp(eth, transport->name, len))
569		return 0;
570
571	eth += len;
572	if (*eth == ',')
573		eth++;
574	else if (*eth != '\0')
575		return 0;
576
577	*init_out = kmalloc(transport->setup_size, gfp_mask);
578	if (*init_out == NULL)
579		return 1;
580
581	if (!transport->setup(eth, mac_out, *init_out)) {
582		kfree(*init_out);
583		*init_out = NULL;
584	}
585	return 1;
586}
587
588void register_transport(struct transport *new)
589{
590	struct list_head *ele, *next;
591	struct eth_init *eth;
592	void *init;
593	char *mac = NULL;
594	int match;
595
596	spin_lock(&transports_lock);
597	BUG_ON(!list_empty(&new->list));
598	list_add(&new->list, &transports);
599	spin_unlock(&transports_lock);
600
601	list_for_each_safe(ele, next, &eth_cmd_line) {
602		eth = list_entry(ele, struct eth_init, list);
603		match = check_transport(new, eth->init, eth->index, &init,
604					&mac, GFP_KERNEL);
605		if (!match)
606			continue;
607		else if (init != NULL) {
608			eth_configure(eth->index, init, mac, new, GFP_KERNEL);
609			kfree(init);
610		}
611		list_del(&eth->list);
612	}
613}
614
615static int eth_setup_common(char *str, int index)
616{
617	struct list_head *ele;
618	struct transport *transport;
619	void *init;
620	char *mac = NULL;
621	int found = 0;
622
623	spin_lock(&transports_lock);
624	list_for_each(ele, &transports) {
625		transport = list_entry(ele, struct transport, list);
626	        if (!check_transport(transport, str, index, &init,
627					&mac, GFP_ATOMIC))
628			continue;
629		if (init != NULL) {
630			eth_configure(index, init, mac, transport, GFP_ATOMIC);
631			kfree(init);
632		}
633		found = 1;
634		break;
635	}
636
637	spin_unlock(&transports_lock);
638	return found;
639}
640
641static int __init eth_setup(char *str)
642{
643	struct eth_init *new;
644	char *error;
645	int n, err;
646
647	err = eth_parse(str, &n, &str, &error);
648	if (err) {
649		printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
650		       str, error);
651		return 1;
652	}
653
654	new = alloc_bootmem(sizeof(*new));
 
 
 
655
656	INIT_LIST_HEAD(&new->list);
657	new->index = n;
658	new->init = str;
659
660	list_add_tail(&new->list, &eth_cmd_line);
661	return 1;
662}
663
664__setup("eth", eth_setup);
665__uml_help(eth_setup,
666"eth[0-9]+=<transport>,<options>\n"
667"    Configure a network device.\n\n"
668);
669
670static int net_config(char *str, char **error_out)
671{
672	int n, err;
673
674	err = eth_parse(str, &n, &str, error_out);
675	if (err)
676		return err;
677
678	/* This string is broken up and the pieces used by the underlying
679	 * driver.  So, it is freed only if eth_setup_common fails.
680	 */
681	str = kstrdup(str, GFP_KERNEL);
682	if (str == NULL) {
683	        *error_out = "net_config failed to strdup string";
684		return -ENOMEM;
685	}
686	err = !eth_setup_common(str, n);
687	if (err)
688		kfree(str);
689	return err;
690}
691
692static int net_id(char **str, int *start_out, int *end_out)
693{
694	char *end;
695	int n;
696
697	n = simple_strtoul(*str, &end, 0);
698	if ((*end != '\0') || (end == *str))
699		return -1;
700
701	*start_out = n;
702	*end_out = n;
703	*str = end;
704	return n;
705}
706
707static int net_remove(int n, char **error_out)
708{
709	struct uml_net *device;
710	struct net_device *dev;
711	struct uml_net_private *lp;
712
713	device = find_device(n);
714	if (device == NULL)
715		return -ENODEV;
716
717	dev = device->dev;
718	lp = netdev_priv(dev);
719	if (lp->fd > 0)
720		return -EBUSY;
721	unregister_netdev(dev);
722	platform_device_unregister(&device->pdev);
723
724	return 0;
725}
726
727static struct mc_device net_mc = {
728	.list		= LIST_HEAD_INIT(net_mc.list),
729	.name		= "eth",
730	.config		= net_config,
731	.get_config	= NULL,
732	.id		= net_id,
733	.remove		= net_remove,
734};
735
736#ifdef CONFIG_INET
737static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
738			      void *ptr)
739{
740	struct in_ifaddr *ifa = ptr;
741	struct net_device *dev = ifa->ifa_dev->dev;
742	struct uml_net_private *lp;
743	void (*proc)(unsigned char *, unsigned char *, void *);
744	unsigned char addr_buf[4], netmask_buf[4];
745
746	if (dev->netdev_ops->ndo_open != uml_net_open)
747		return NOTIFY_DONE;
748
749	lp = netdev_priv(dev);
750
751	proc = NULL;
752	switch (event) {
753	case NETDEV_UP:
754		proc = lp->add_address;
755		break;
756	case NETDEV_DOWN:
757		proc = lp->delete_address;
758		break;
759	}
760	if (proc != NULL) {
761		memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
762		memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
763		(*proc)(addr_buf, netmask_buf, &lp->user);
764	}
765	return NOTIFY_DONE;
766}
767
768/* uml_net_init shouldn't be called twice on two CPUs at the same time */
769static struct notifier_block uml_inetaddr_notifier = {
770	.notifier_call		= uml_inetaddr_event,
771};
772
773static void inet_register(void)
774{
775	struct list_head *ele;
776	struct uml_net_private *lp;
777	struct in_device *ip;
778	struct in_ifaddr *in;
779
780	register_inetaddr_notifier(&uml_inetaddr_notifier);
781
782	/* Devices may have been opened already, so the uml_inetaddr_notifier
783	 * didn't get a chance to run for them.  This fakes it so that
784	 * addresses which have already been set up get handled properly.
785	 */
786	spin_lock(&opened_lock);
787	list_for_each(ele, &opened) {
788		lp = list_entry(ele, struct uml_net_private, list);
789		ip = lp->dev->ip_ptr;
790		if (ip == NULL)
791			continue;
792		in = ip->ifa_list;
793		while (in != NULL) {
794			uml_inetaddr_event(NULL, NETDEV_UP, in);
795			in = in->ifa_next;
796		}
797	}
798	spin_unlock(&opened_lock);
799}
800#else
801static inline void inet_register(void)
802{
803}
804#endif
805
806static int uml_net_init(void)
807{
808	mconsole_register_dev(&net_mc);
809	inet_register();
810	return 0;
811}
812
813__initcall(uml_net_init);
814
815static void close_devices(void)
816{
817	struct list_head *ele;
818	struct uml_net_private *lp;
819
820	spin_lock(&opened_lock);
821	list_for_each(ele, &opened) {
822		lp = list_entry(ele, struct uml_net_private, list);
823		um_free_irq(lp->dev->irq, lp->dev);
824		if ((lp->close != NULL) && (lp->fd >= 0))
825			(*lp->close)(lp->fd, &lp->user);
826		if (lp->remove != NULL)
827			(*lp->remove)(&lp->user);
828	}
829	spin_unlock(&opened_lock);
830}
831
832__uml_exitcall(close_devices);
833
834void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
835					void *),
836		    void *arg)
837{
838	struct net_device *dev = d;
839	struct in_device *ip = dev->ip_ptr;
840	struct in_ifaddr *in;
841	unsigned char address[4], netmask[4];
842
843	if (ip == NULL) return;
844	in = ip->ifa_list;
845	while (in != NULL) {
846		memcpy(address, &in->ifa_address, sizeof(address));
847		memcpy(netmask, &in->ifa_mask, sizeof(netmask));
848		(*cb)(address, netmask, arg);
849		in = in->ifa_next;
850	}
851}
852
853int dev_netmask(void *d, void *m)
854{
855	struct net_device *dev = d;
856	struct in_device *ip = dev->ip_ptr;
857	struct in_ifaddr *in;
858	__be32 *mask_out = m;
859
860	if (ip == NULL)
861		return 1;
862
863	in = ip->ifa_list;
864	if (in == NULL)
865		return 1;
866
867	*mask_out = in->ifa_mask;
868	return 0;
869}
870
871void *get_output_buffer(int *len_out)
872{
873	void *ret;
874
875	ret = (void *) __get_free_pages(GFP_KERNEL, 0);
876	if (ret) *len_out = PAGE_SIZE;
877	else *len_out = 0;
878	return ret;
879}
880
881void free_output_buffer(void *buffer)
882{
883	free_pages((unsigned long) buffer, 0);
884}
885
886int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
887		     char **gate_addr)
888{
889	char *remain;
890
891	remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
892	if (remain != NULL) {
893		printk(KERN_ERR "tap_setup_common - Extra garbage on "
894		       "specification : '%s'\n", remain);
895		return 1;
896	}
897
898	return 0;
899}
900
901unsigned short eth_protocol(struct sk_buff *skb)
902{
903	return eth_type_trans(skb, skb->dev);
904}