PageRenderTime 48ms CodeModel.GetById 15ms app.highlight 28ms RepoModel.GetById 0ms app.codeStats 1ms

/arch/um/drivers/net_kern.c

https://bitbucket.org/ndreys/linux-sunxi
C | 902 lines | 701 code | 147 blank | 54 comment | 115 complexity | d4650fa9c71e31d5621589bd1016600e MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  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_DISABLED | 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	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
222	if (len == skb->len) {
223		dev->stats.tx_packets++;
224		dev->stats.tx_bytes += skb->len;
225		dev->trans_start = jiffies;
226		netif_start_queue(dev);
227
228		/* this is normally done in the interrupt when tx finishes */
229		netif_wake_queue(dev);
230	}
231	else if (len == 0) {
232		netif_start_queue(dev);
233		dev->stats.tx_dropped++;
234	}
235	else {
236		netif_start_queue(dev);
237		printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
238	}
239
240	spin_unlock_irqrestore(&lp->lock, flags);
241
242	dev_kfree_skb(skb);
243
244	return NETDEV_TX_OK;
245}
246
247static void uml_net_set_multicast_list(struct net_device *dev)
248{
249	return;
250}
251
252static void uml_net_tx_timeout(struct net_device *dev)
253{
254	dev->trans_start = jiffies;
255	netif_wake_queue(dev);
256}
257
258static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
259{
260	dev->mtu = new_mtu;
261
262	return 0;
263}
264
265static void uml_net_get_drvinfo(struct net_device *dev,
266				struct ethtool_drvinfo *info)
267{
268	strcpy(info->driver, DRIVER_NAME);
269	strcpy(info->version, "42");
270}
271
272static const struct ethtool_ops uml_net_ethtool_ops = {
273	.get_drvinfo	= uml_net_get_drvinfo,
274	.get_link	= ethtool_op_get_link,
275};
276
277static void uml_net_user_timer_expire(unsigned long _conn)
278{
279#ifdef undef
280	struct connection *conn = (struct connection *)_conn;
281
282	dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
283	do_connect(conn);
284#endif
285}
286
287static void setup_etheraddr(char *str, unsigned char *addr, char *name)
288{
289	char *end;
290	int i;
291
292	if (str == NULL)
293		goto random;
294
295	for (i = 0; i < 6; i++) {
296		addr[i] = simple_strtoul(str, &end, 16);
297		if ((end == str) ||
298		   ((*end != ':') && (*end != ',') && (*end != '\0'))) {
299			printk(KERN_ERR
300			       "setup_etheraddr: failed to parse '%s' "
301			       "as an ethernet address\n", str);
302			goto random;
303		}
304		str = end + 1;
305	}
306	if (is_multicast_ether_addr(addr)) {
307		printk(KERN_ERR
308		       "Attempt to assign a multicast ethernet address to a "
309		       "device disallowed\n");
310		goto random;
311	}
312	if (!is_valid_ether_addr(addr)) {
313		printk(KERN_ERR
314		       "Attempt to assign an invalid ethernet address to a "
315		       "device disallowed\n");
316		goto random;
317	}
318	if (!is_local_ether_addr(addr)) {
319		printk(KERN_WARNING
320		       "Warning: Assigning a globally valid ethernet "
321		       "address to a device\n");
322		printk(KERN_WARNING "You should set the 2nd rightmost bit in "
323		       "the first byte of the MAC,\n");
324		printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
325		       addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
326		       addr[5]);
327	}
328	return;
329
330random:
331	printk(KERN_INFO
332	       "Choosing a random ethernet address for device %s\n", name);
333	random_ether_addr(addr);
334}
335
336static DEFINE_SPINLOCK(devices_lock);
337static LIST_HEAD(devices);
338
339static struct platform_driver uml_net_driver = {
340	.driver = {
341		.name  = DRIVER_NAME,
342	},
343};
344
345static void net_device_release(struct device *dev)
346{
347	struct uml_net *device = dev_get_drvdata(dev);
348	struct net_device *netdev = device->dev;
349	struct uml_net_private *lp = netdev_priv(netdev);
350
351	if (lp->remove != NULL)
352		(*lp->remove)(&lp->user);
353	list_del(&device->list);
354	kfree(device);
355	free_netdev(netdev);
356}
357
358static const struct net_device_ops uml_netdev_ops = {
359	.ndo_open 		= uml_net_open,
360	.ndo_stop 		= uml_net_close,
361	.ndo_start_xmit 	= uml_net_start_xmit,
362	.ndo_set_multicast_list = uml_net_set_multicast_list,
363	.ndo_tx_timeout 	= uml_net_tx_timeout,
364	.ndo_set_mac_address	= eth_mac_addr,
365	.ndo_change_mtu 	= uml_net_change_mtu,
366	.ndo_validate_addr	= eth_validate_addr,
367};
368
369/*
370 * Ensures that platform_driver_register is called only once by
371 * eth_configure.  Will be set in an initcall.
372 */
373static int driver_registered;
374
375static void eth_configure(int n, void *init, char *mac,
376			  struct transport *transport)
377{
378	struct uml_net *device;
379	struct net_device *dev;
380	struct uml_net_private *lp;
381	int err, size;
382
383	size = transport->private_size + sizeof(struct uml_net_private);
384
385	device = kzalloc(sizeof(*device), GFP_KERNEL);
386	if (device == NULL) {
387		printk(KERN_ERR "eth_configure failed to allocate struct "
388		       "uml_net\n");
389		return;
390	}
391
392	dev = alloc_etherdev(size);
393	if (dev == NULL) {
394		printk(KERN_ERR "eth_configure: failed to allocate struct "
395		       "net_device for eth%d\n", n);
396		goto out_free_device;
397	}
398
399	INIT_LIST_HEAD(&device->list);
400	device->index = n;
401
402	/* If this name ends up conflicting with an existing registered
403	 * netdevice, that is OK, register_netdev{,ice}() will notice this
404	 * and fail.
405	 */
406	snprintf(dev->name, sizeof(dev->name), "eth%d", n);
407
408	setup_etheraddr(mac, device->mac, dev->name);
409
410	printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac);
411
412	lp = netdev_priv(dev);
413	/* This points to the transport private data. It's still clear, but we
414	 * must memset it to 0 *now*. Let's help the drivers. */
415	memset(lp, 0, size);
416	INIT_WORK(&lp->work, uml_dev_close);
417
418	/* sysfs register */
419	if (!driver_registered) {
420		platform_driver_register(&uml_net_driver);
421		driver_registered = 1;
422	}
423	device->pdev.id = n;
424	device->pdev.name = DRIVER_NAME;
425	device->pdev.dev.release = net_device_release;
426	dev_set_drvdata(&device->pdev.dev, device);
427	if (platform_device_register(&device->pdev))
428		goto out_free_netdev;
429	SET_NETDEV_DEV(dev,&device->pdev.dev);
430
431	device->dev = dev;
432
433	/*
434	 * These just fill in a data structure, so there's no failure
435	 * to be worried about.
436	 */
437	(*transport->kern->init)(dev, init);
438
439	*lp = ((struct uml_net_private)
440		{ .list  		= LIST_HEAD_INIT(lp->list),
441		  .dev 			= dev,
442		  .fd 			= -1,
443		  .mac 			= { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
444		  .max_packet		= transport->user->max_packet,
445		  .protocol 		= transport->kern->protocol,
446		  .open 		= transport->user->open,
447		  .close 		= transport->user->close,
448		  .remove 		= transport->user->remove,
449		  .read 		= transport->kern->read,
450		  .write 		= transport->kern->write,
451		  .add_address 		= transport->user->add_address,
452		  .delete_address  	= transport->user->delete_address });
453
454	init_timer(&lp->tl);
455	spin_lock_init(&lp->lock);
456	lp->tl.function = uml_net_user_timer_expire;
457	memcpy(lp->mac, device->mac, sizeof(lp->mac));
458
459	if ((transport->user->init != NULL) &&
460	    ((*transport->user->init)(&lp->user, dev) != 0))
461		goto out_unregister;
462
463	/* don't use eth_mac_addr, it will not work here */
464	memcpy(dev->dev_addr, device->mac, ETH_ALEN);
465	dev->mtu = transport->user->mtu;
466	dev->netdev_ops = &uml_netdev_ops;
467	dev->ethtool_ops = &uml_net_ethtool_ops;
468	dev->watchdog_timeo = (HZ >> 1);
469	dev->irq = UM_ETH_IRQ;
470
471	err = update_drop_skb(lp->max_packet);
472	if (err)
473		goto out_undo_user_init;
474
475	rtnl_lock();
476	err = register_netdevice(dev);
477	rtnl_unlock();
478	if (err)
479		goto out_undo_user_init;
480
481	spin_lock(&devices_lock);
482	list_add(&device->list, &devices);
483	spin_unlock(&devices_lock);
484
485	return;
486
487out_undo_user_init:
488	if (transport->user->remove != NULL)
489		(*transport->user->remove)(&lp->user);
490out_unregister:
491	platform_device_unregister(&device->pdev);
492	return; /* platform_device_unregister frees dev and device */
493out_free_netdev:
494	free_netdev(dev);
495out_free_device:
496	kfree(device);
497}
498
499static struct uml_net *find_device(int n)
500{
501	struct uml_net *device;
502	struct list_head *ele;
503
504	spin_lock(&devices_lock);
505	list_for_each(ele, &devices) {
506		device = list_entry(ele, struct uml_net, list);
507		if (device->index == n)
508			goto out;
509	}
510	device = NULL;
511 out:
512	spin_unlock(&devices_lock);
513	return device;
514}
515
516static int eth_parse(char *str, int *index_out, char **str_out,
517		     char **error_out)
518{
519	char *end;
520	int n, err = -EINVAL;
521
522	n = simple_strtoul(str, &end, 0);
523	if (end == str) {
524		*error_out = "Bad device number";
525		return err;
526	}
527
528	str = end;
529	if (*str != '=') {
530		*error_out = "Expected '=' after device number";
531		return err;
532	}
533
534	str++;
535	if (find_device(n)) {
536		*error_out = "Device already configured";
537		return err;
538	}
539
540	*index_out = n;
541	*str_out = str;
542	return 0;
543}
544
545struct eth_init {
546	struct list_head list;
547	char *init;
548	int index;
549};
550
551static DEFINE_SPINLOCK(transports_lock);
552static LIST_HEAD(transports);
553
554/* Filled in during early boot */
555static LIST_HEAD(eth_cmd_line);
556
557static int check_transport(struct transport *transport, char *eth, int n,
558			   void **init_out, char **mac_out)
559{
560	int len;
561
562	len = strlen(transport->name);
563	if (strncmp(eth, transport->name, len))
564		return 0;
565
566	eth += len;
567	if (*eth == ',')
568		eth++;
569	else if (*eth != '\0')
570		return 0;
571
572	*init_out = kmalloc(transport->setup_size, GFP_KERNEL);
573	if (*init_out == NULL)
574		return 1;
575
576	if (!transport->setup(eth, mac_out, *init_out)) {
577		kfree(*init_out);
578		*init_out = NULL;
579	}
580	return 1;
581}
582
583void register_transport(struct transport *new)
584{
585	struct list_head *ele, *next;
586	struct eth_init *eth;
587	void *init;
588	char *mac = NULL;
589	int match;
590
591	spin_lock(&transports_lock);
592	BUG_ON(!list_empty(&new->list));
593	list_add(&new->list, &transports);
594	spin_unlock(&transports_lock);
595
596	list_for_each_safe(ele, next, &eth_cmd_line) {
597		eth = list_entry(ele, struct eth_init, list);
598		match = check_transport(new, eth->init, eth->index, &init,
599					&mac);
600		if (!match)
601			continue;
602		else if (init != NULL) {
603			eth_configure(eth->index, init, mac, new);
604			kfree(init);
605		}
606		list_del(&eth->list);
607	}
608}
609
610static int eth_setup_common(char *str, int index)
611{
612	struct list_head *ele;
613	struct transport *transport;
614	void *init;
615	char *mac = NULL;
616	int found = 0;
617
618	spin_lock(&transports_lock);
619	list_for_each(ele, &transports) {
620		transport = list_entry(ele, struct transport, list);
621	        if (!check_transport(transport, str, index, &init, &mac))
622			continue;
623		if (init != NULL) {
624			eth_configure(index, init, mac, transport);
625			kfree(init);
626		}
627		found = 1;
628		break;
629	}
630
631	spin_unlock(&transports_lock);
632	return found;
633}
634
635static int __init eth_setup(char *str)
636{
637	struct eth_init *new;
638	char *error;
639	int n, err;
640
641	err = eth_parse(str, &n, &str, &error);
642	if (err) {
643		printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
644		       str, error);
645		return 1;
646	}
647
648	new = alloc_bootmem(sizeof(*new));
649	if (new == NULL) {
650		printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
651		return 1;
652	}
653
654	INIT_LIST_HEAD(&new->list);
655	new->index = n;
656	new->init = str;
657
658	list_add_tail(&new->list, &eth_cmd_line);
659	return 1;
660}
661
662__setup("eth", eth_setup);
663__uml_help(eth_setup,
664"eth[0-9]+=<transport>,<options>\n"
665"    Configure a network device.\n\n"
666);
667
668static int net_config(char *str, char **error_out)
669{
670	int n, err;
671
672	err = eth_parse(str, &n, &str, error_out);
673	if (err)
674		return err;
675
676	/* This string is broken up and the pieces used by the underlying
677	 * driver.  So, it is freed only if eth_setup_common fails.
678	 */
679	str = kstrdup(str, GFP_KERNEL);
680	if (str == NULL) {
681	        *error_out = "net_config failed to strdup string";
682		return -ENOMEM;
683	}
684	err = !eth_setup_common(str, n);
685	if (err)
686		kfree(str);
687	return err;
688}
689
690static int net_id(char **str, int *start_out, int *end_out)
691{
692	char *end;
693	int n;
694
695	n = simple_strtoul(*str, &end, 0);
696	if ((*end != '\0') || (end == *str))
697		return -1;
698
699	*start_out = n;
700	*end_out = n;
701	*str = end;
702	return n;
703}
704
705static int net_remove(int n, char **error_out)
706{
707	struct uml_net *device;
708	struct net_device *dev;
709	struct uml_net_private *lp;
710
711	device = find_device(n);
712	if (device == NULL)
713		return -ENODEV;
714
715	dev = device->dev;
716	lp = netdev_priv(dev);
717	if (lp->fd > 0)
718		return -EBUSY;
719	unregister_netdev(dev);
720	platform_device_unregister(&device->pdev);
721
722	return 0;
723}
724
725static struct mc_device net_mc = {
726	.list		= LIST_HEAD_INIT(net_mc.list),
727	.name		= "eth",
728	.config		= net_config,
729	.get_config	= NULL,
730	.id		= net_id,
731	.remove		= net_remove,
732};
733
734#ifdef CONFIG_INET
735static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
736			      void *ptr)
737{
738	struct in_ifaddr *ifa = ptr;
739	struct net_device *dev = ifa->ifa_dev->dev;
740	struct uml_net_private *lp;
741	void (*proc)(unsigned char *, unsigned char *, void *);
742	unsigned char addr_buf[4], netmask_buf[4];
743
744	if (dev->netdev_ops->ndo_open != uml_net_open)
745		return NOTIFY_DONE;
746
747	lp = netdev_priv(dev);
748
749	proc = NULL;
750	switch (event) {
751	case NETDEV_UP:
752		proc = lp->add_address;
753		break;
754	case NETDEV_DOWN:
755		proc = lp->delete_address;
756		break;
757	}
758	if (proc != NULL) {
759		memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
760		memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
761		(*proc)(addr_buf, netmask_buf, &lp->user);
762	}
763	return NOTIFY_DONE;
764}
765
766/* uml_net_init shouldn't be called twice on two CPUs at the same time */
767static struct notifier_block uml_inetaddr_notifier = {
768	.notifier_call		= uml_inetaddr_event,
769};
770
771static void inet_register(void)
772{
773	struct list_head *ele;
774	struct uml_net_private *lp;
775	struct in_device *ip;
776	struct in_ifaddr *in;
777
778	register_inetaddr_notifier(&uml_inetaddr_notifier);
779
780	/* Devices may have been opened already, so the uml_inetaddr_notifier
781	 * didn't get a chance to run for them.  This fakes it so that
782	 * addresses which have already been set up get handled properly.
783	 */
784	spin_lock(&opened_lock);
785	list_for_each(ele, &opened) {
786		lp = list_entry(ele, struct uml_net_private, list);
787		ip = lp->dev->ip_ptr;
788		if (ip == NULL)
789			continue;
790		in = ip->ifa_list;
791		while (in != NULL) {
792			uml_inetaddr_event(NULL, NETDEV_UP, in);
793			in = in->ifa_next;
794		}
795	}
796	spin_unlock(&opened_lock);
797}
798#else
799static inline void inet_register(void)
800{
801}
802#endif
803
804static int uml_net_init(void)
805{
806	mconsole_register_dev(&net_mc);
807	inet_register();
808	return 0;
809}
810
811__initcall(uml_net_init);
812
813static void close_devices(void)
814{
815	struct list_head *ele;
816	struct uml_net_private *lp;
817
818	spin_lock(&opened_lock);
819	list_for_each(ele, &opened) {
820		lp = list_entry(ele, struct uml_net_private, list);
821		free_irq(lp->dev->irq, lp->dev);
822		if ((lp->close != NULL) && (lp->fd >= 0))
823			(*lp->close)(lp->fd, &lp->user);
824		if (lp->remove != NULL)
825			(*lp->remove)(&lp->user);
826	}
827	spin_unlock(&opened_lock);
828}
829
830__uml_exitcall(close_devices);
831
832void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
833					void *),
834		    void *arg)
835{
836	struct net_device *dev = d;
837	struct in_device *ip = dev->ip_ptr;
838	struct in_ifaddr *in;
839	unsigned char address[4], netmask[4];
840
841	if (ip == NULL) return;
842	in = ip->ifa_list;
843	while (in != NULL) {
844		memcpy(address, &in->ifa_address, sizeof(address));
845		memcpy(netmask, &in->ifa_mask, sizeof(netmask));
846		(*cb)(address, netmask, arg);
847		in = in->ifa_next;
848	}
849}
850
851int dev_netmask(void *d, void *m)
852{
853	struct net_device *dev = d;
854	struct in_device *ip = dev->ip_ptr;
855	struct in_ifaddr *in;
856	__be32 *mask_out = m;
857
858	if (ip == NULL)
859		return 1;
860
861	in = ip->ifa_list;
862	if (in == NULL)
863		return 1;
864
865	*mask_out = in->ifa_mask;
866	return 0;
867}
868
869void *get_output_buffer(int *len_out)
870{
871	void *ret;
872
873	ret = (void *) __get_free_pages(GFP_KERNEL, 0);
874	if (ret) *len_out = PAGE_SIZE;
875	else *len_out = 0;
876	return ret;
877}
878
879void free_output_buffer(void *buffer)
880{
881	free_pages((unsigned long) buffer, 0);
882}
883
884int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
885		     char **gate_addr)
886{
887	char *remain;
888
889	remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
890	if (remain != NULL) {
891		printk(KERN_ERR "tap_setup_common - Extra garbage on "
892		       "specification : '%s'\n", remain);
893		return 1;
894	}
895
896	return 0;
897}
898
899unsigned short eth_protocol(struct sk_buff *skb)
900{
901	return eth_type_trans(skb, skb->dev);
902}