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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
30 static DEFINE_SPINLOCK(opened_lock);
31 static 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  */
41 static DEFINE_SPINLOCK(drop_lock);
42 static struct sk_buff *drop_skb;
43 static int drop_max;
44
45 static 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;
67 out:
68         spin_unlock_irqrestore(&drop_lock, flags);
69
70         return err;
71 }
72
73 static 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
108 static 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
115 static 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
142 out:
143         spin_unlock(&lp->lock);
144         return IRQ_HANDLED;
145 }
146
147 static 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;
185 out_close:
186         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
187         lp->fd = -1;
188 out:
189         return err;
190 }
191
192 static 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
210 static 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                 dev->trans_start = jiffies;
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
248 static void uml_net_set_multicast_list(struct net_device *dev)
249 {
250         return;
251 }
252
253 static void uml_net_tx_timeout(struct net_device *dev)
254 {
255         dev->trans_start = jiffies;
256         netif_wake_queue(dev);
257 }
258
259 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
260 {
261         dev->mtu = new_mtu;
262
263         return 0;
264 }
265
266 #ifdef CONFIG_NET_POLL_CONTROLLER
267 static void uml_net_poll_controller(struct net_device *dev)
268 {
269         disable_irq(dev->irq);
270         uml_net_interrupt(dev->irq, dev);
271         enable_irq(dev->irq);
272 }
273 #endif
274
275 static void uml_net_get_drvinfo(struct net_device *dev,
276                                 struct ethtool_drvinfo *info)
277 {
278         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
279         strlcpy(info->version, "42", sizeof(info->version));
280 }
281
282 static const struct ethtool_ops uml_net_ethtool_ops = {
283         .get_drvinfo    = uml_net_get_drvinfo,
284         .get_link       = ethtool_op_get_link,
285         .get_ts_info    = ethtool_op_get_ts_info,
286 };
287
288 static void uml_net_user_timer_expire(unsigned long _conn)
289 {
290 #ifdef undef
291         struct connection *conn = (struct connection *)_conn;
292
293         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
294         do_connect(conn);
295 #endif
296 }
297
298 static void setup_etheraddr(struct net_device *dev, char *str)
299 {
300         unsigned char *addr = dev->dev_addr;
301         char *end;
302         int i;
303
304         if (str == NULL)
305                 goto random;
306
307         for (i = 0; i < 6; i++) {
308                 addr[i] = simple_strtoul(str, &end, 16);
309                 if ((end == str) ||
310                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
311                         printk(KERN_ERR
312                                "setup_etheraddr: failed to parse '%s' "
313                                "as an ethernet address\n", str);
314                         goto random;
315                 }
316                 str = end + 1;
317         }
318         if (is_multicast_ether_addr(addr)) {
319                 printk(KERN_ERR
320                        "Attempt to assign a multicast ethernet address to a "
321                        "device disallowed\n");
322                 goto random;
323         }
324         if (!is_valid_ether_addr(addr)) {
325                 printk(KERN_ERR
326                        "Attempt to assign an invalid ethernet address to a "
327                        "device disallowed\n");
328                 goto random;
329         }
330         if (!is_local_ether_addr(addr)) {
331                 printk(KERN_WARNING
332                        "Warning: Assigning a globally valid ethernet "
333                        "address to a device\n");
334                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
335                        "the first byte of the MAC,\n");
336                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
337                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
338                        addr[5]);
339         }
340         return;
341
342 random:
343         printk(KERN_INFO
344                "Choosing a random ethernet address for device %s\n", dev->name);
345         eth_hw_addr_random(dev);
346 }
347
348 static DEFINE_SPINLOCK(devices_lock);
349 static LIST_HEAD(devices);
350
351 static struct platform_driver uml_net_driver = {
352         .driver = {
353                 .name  = DRIVER_NAME,
354         },
355 };
356
357 static void net_device_release(struct device *dev)
358 {
359         struct uml_net *device = dev_get_drvdata(dev);
360         struct net_device *netdev = device->dev;
361         struct uml_net_private *lp = netdev_priv(netdev);
362
363         if (lp->remove != NULL)
364                 (*lp->remove)(&lp->user);
365         list_del(&device->list);
366         kfree(device);
367         free_netdev(netdev);
368 }
369
370 static const struct net_device_ops uml_netdev_ops = {
371         .ndo_open               = uml_net_open,
372         .ndo_stop               = uml_net_close,
373         .ndo_start_xmit         = uml_net_start_xmit,
374         .ndo_set_rx_mode        = uml_net_set_multicast_list,
375         .ndo_tx_timeout         = uml_net_tx_timeout,
376         .ndo_set_mac_address    = eth_mac_addr,
377         .ndo_change_mtu         = uml_net_change_mtu,
378         .ndo_validate_addr      = eth_validate_addr,
379 #ifdef CONFIG_NET_POLL_CONTROLLER
380         .ndo_poll_controller = uml_net_poll_controller,
381 #endif
382 };
383
384 /*
385  * Ensures that platform_driver_register is called only once by
386  * eth_configure.  Will be set in an initcall.
387  */
388 static int driver_registered;
389
390 static void eth_configure(int n, void *init, char *mac,
391                           struct transport *transport)
392 {
393         struct uml_net *device;
394         struct net_device *dev;
395         struct uml_net_private *lp;
396         int err, size;
397
398         size = transport->private_size + sizeof(struct uml_net_private);
399
400         device = kzalloc(sizeof(*device), GFP_KERNEL);
401         if (device == NULL) {
402                 printk(KERN_ERR "eth_configure failed to allocate struct "
403                        "uml_net\n");
404                 return;
405         }
406
407         dev = alloc_etherdev(size);
408         if (dev == NULL) {
409                 printk(KERN_ERR "eth_configure: failed to allocate struct "
410                        "net_device for eth%d\n", n);
411                 goto out_free_device;
412         }
413
414         INIT_LIST_HEAD(&device->list);
415         device->index = n;
416
417         /* If this name ends up conflicting with an existing registered
418          * netdevice, that is OK, register_netdev{,ice}() will notice this
419          * and fail.
420          */
421         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
422
423         setup_etheraddr(dev, mac);
424
425         printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
426
427         lp = netdev_priv(dev);
428         /* This points to the transport private data. It's still clear, but we
429          * must memset it to 0 *now*. Let's help the drivers. */
430         memset(lp, 0, size);
431         INIT_WORK(&lp->work, uml_dev_close);
432
433         /* sysfs register */
434         if (!driver_registered) {
435                 platform_driver_register(&uml_net_driver);
436                 driver_registered = 1;
437         }
438         device->pdev.id = n;
439         device->pdev.name = DRIVER_NAME;
440         device->pdev.dev.release = net_device_release;
441         dev_set_drvdata(&device->pdev.dev, device);
442         if (platform_device_register(&device->pdev))
443                 goto out_free_netdev;
444         SET_NETDEV_DEV(dev,&device->pdev.dev);
445
446         device->dev = dev;
447
448         /*
449          * These just fill in a data structure, so there's no failure
450          * to be worried about.
451          */
452         (*transport->kern->init)(dev, init);
453
454         *lp = ((struct uml_net_private)
455                 { .list                 = LIST_HEAD_INIT(lp->list),
456                   .dev                  = dev,
457                   .fd                   = -1,
458                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
459                   .max_packet           = transport->user->max_packet,
460                   .protocol             = transport->kern->protocol,
461                   .open                 = transport->user->open,
462                   .close                = transport->user->close,
463                   .remove               = transport->user->remove,
464                   .read                 = transport->kern->read,
465                   .write                = transport->kern->write,
466                   .add_address          = transport->user->add_address,
467                   .delete_address       = transport->user->delete_address });
468
469         init_timer(&lp->tl);
470         spin_lock_init(&lp->lock);
471         lp->tl.function = uml_net_user_timer_expire;
472         memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
473
474         if ((transport->user->init != NULL) &&
475             ((*transport->user->init)(&lp->user, dev) != 0))
476                 goto out_unregister;
477
478         dev->mtu = transport->user->mtu;
479         dev->netdev_ops = &uml_netdev_ops;
480         dev->ethtool_ops = &uml_net_ethtool_ops;
481         dev->watchdog_timeo = (HZ >> 1);
482         dev->irq = UM_ETH_IRQ;
483
484         err = update_drop_skb(lp->max_packet);
485         if (err)
486                 goto out_undo_user_init;
487
488         rtnl_lock();
489         err = register_netdevice(dev);
490         rtnl_unlock();
491         if (err)
492                 goto out_undo_user_init;
493
494         spin_lock(&devices_lock);
495         list_add(&device->list, &devices);
496         spin_unlock(&devices_lock);
497
498         return;
499
500 out_undo_user_init:
501         if (transport->user->remove != NULL)
502                 (*transport->user->remove)(&lp->user);
503 out_unregister:
504         platform_device_unregister(&device->pdev);
505         return; /* platform_device_unregister frees dev and device */
506 out_free_netdev:
507         free_netdev(dev);
508 out_free_device:
509         kfree(device);
510 }
511
512 static struct uml_net *find_device(int n)
513 {
514         struct uml_net *device;
515         struct list_head *ele;
516
517         spin_lock(&devices_lock);
518         list_for_each(ele, &devices) {
519                 device = list_entry(ele, struct uml_net, list);
520                 if (device->index == n)
521                         goto out;
522         }
523         device = NULL;
524  out:
525         spin_unlock(&devices_lock);
526         return device;
527 }
528
529 static int eth_parse(char *str, int *index_out, char **str_out,
530                      char **error_out)
531 {
532         char *end;
533         int n, err = -EINVAL;
534
535         n = simple_strtoul(str, &end, 0);
536         if (end == str) {
537                 *error_out = "Bad device number";
538                 return err;
539         }
540
541         str = end;
542         if (*str != '=') {
543                 *error_out = "Expected '=' after device number";
544                 return err;
545         }
546
547         str++;
548         if (find_device(n)) {
549                 *error_out = "Device already configured";
550                 return err;
551         }
552
553         *index_out = n;
554         *str_out = str;
555         return 0;
556 }
557
558 struct eth_init {
559         struct list_head list;
560         char *init;
561         int index;
562 };
563
564 static DEFINE_SPINLOCK(transports_lock);
565 static LIST_HEAD(transports);
566
567 /* Filled in during early boot */
568 static LIST_HEAD(eth_cmd_line);
569
570 static int check_transport(struct transport *transport, char *eth, int n,
571                            void **init_out, char **mac_out)
572 {
573         int len;
574
575         len = strlen(transport->name);
576         if (strncmp(eth, transport->name, len))
577                 return 0;
578
579         eth += len;
580         if (*eth == ',')
581                 eth++;
582         else if (*eth != '\0')
583                 return 0;
584
585         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
586         if (*init_out == NULL)
587                 return 1;
588
589         if (!transport->setup(eth, mac_out, *init_out)) {
590                 kfree(*init_out);
591                 *init_out = NULL;
592         }
593         return 1;
594 }
595
596 void register_transport(struct transport *new)
597 {
598         struct list_head *ele, *next;
599         struct eth_init *eth;
600         void *init;
601         char *mac = NULL;
602         int match;
603
604         spin_lock(&transports_lock);
605         BUG_ON(!list_empty(&new->list));
606         list_add(&new->list, &transports);
607         spin_unlock(&transports_lock);
608
609         list_for_each_safe(ele, next, &eth_cmd_line) {
610                 eth = list_entry(ele, struct eth_init, list);
611                 match = check_transport(new, eth->init, eth->index, &init,
612                                         &mac);
613                 if (!match)
614                         continue;
615                 else if (init != NULL) {
616                         eth_configure(eth->index, init, mac, new);
617                         kfree(init);
618                 }
619                 list_del(&eth->list);
620         }
621 }
622
623 static int eth_setup_common(char *str, int index)
624 {
625         struct list_head *ele;
626         struct transport *transport;
627         void *init;
628         char *mac = NULL;
629         int found = 0;
630
631         spin_lock(&transports_lock);
632         list_for_each(ele, &transports) {
633                 transport = list_entry(ele, struct transport, list);
634                 if (!check_transport(transport, str, index, &init, &mac))
635                         continue;
636                 if (init != NULL) {
637                         eth_configure(index, init, mac, transport);
638                         kfree(init);
639                 }
640                 found = 1;
641                 break;
642         }
643
644         spin_unlock(&transports_lock);
645         return found;
646 }
647
648 static int __init eth_setup(char *str)
649 {
650         struct eth_init *new;
651         char *error;
652         int n, err;
653
654         err = eth_parse(str, &n, &str, &error);
655         if (err) {
656                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
657                        str, error);
658                 return 1;
659         }
660
661         new = alloc_bootmem(sizeof(*new));
662
663         INIT_LIST_HEAD(&new->list);
664         new->index = n;
665         new->init = str;
666
667         list_add_tail(&new->list, &eth_cmd_line);
668         return 1;
669 }
670
671 __setup("eth", eth_setup);
672 __uml_help(eth_setup,
673 "eth[0-9]+=<transport>,<options>\n"
674 "    Configure a network device.\n\n"
675 );
676
677 static int net_config(char *str, char **error_out)
678 {
679         int n, err;
680
681         err = eth_parse(str, &n, &str, error_out);
682         if (err)
683                 return err;
684
685         /* This string is broken up and the pieces used by the underlying
686          * driver.  So, it is freed only if eth_setup_common fails.
687          */
688         str = kstrdup(str, GFP_KERNEL);
689         if (str == NULL) {
690                 *error_out = "net_config failed to strdup string";
691                 return -ENOMEM;
692         }
693         err = !eth_setup_common(str, n);
694         if (err)
695                 kfree(str);
696         return err;
697 }
698
699 static int net_id(char **str, int *start_out, int *end_out)
700 {
701         char *end;
702         int n;
703
704         n = simple_strtoul(*str, &end, 0);
705         if ((*end != '\0') || (end == *str))
706                 return -1;
707
708         *start_out = n;
709         *end_out = n;
710         *str = end;
711         return n;
712 }
713
714 static int net_remove(int n, char **error_out)
715 {
716         struct uml_net *device;
717         struct net_device *dev;
718         struct uml_net_private *lp;
719
720         device = find_device(n);
721         if (device == NULL)
722                 return -ENODEV;
723
724         dev = device->dev;
725         lp = netdev_priv(dev);
726         if (lp->fd > 0)
727                 return -EBUSY;
728         unregister_netdev(dev);
729         platform_device_unregister(&device->pdev);
730
731         return 0;
732 }
733
734 static struct mc_device net_mc = {
735         .list           = LIST_HEAD_INIT(net_mc.list),
736         .name           = "eth",
737         .config         = net_config,
738         .get_config     = NULL,
739         .id             = net_id,
740         .remove         = net_remove,
741 };
742
743 #ifdef CONFIG_INET
744 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
745                               void *ptr)
746 {
747         struct in_ifaddr *ifa = ptr;
748         struct net_device *dev = ifa->ifa_dev->dev;
749         struct uml_net_private *lp;
750         void (*proc)(unsigned char *, unsigned char *, void *);
751         unsigned char addr_buf[4], netmask_buf[4];
752
753         if (dev->netdev_ops->ndo_open != uml_net_open)
754                 return NOTIFY_DONE;
755
756         lp = netdev_priv(dev);
757
758         proc = NULL;
759         switch (event) {
760         case NETDEV_UP:
761                 proc = lp->add_address;
762                 break;
763         case NETDEV_DOWN:
764                 proc = lp->delete_address;
765                 break;
766         }
767         if (proc != NULL) {
768                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
769                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
770                 (*proc)(addr_buf, netmask_buf, &lp->user);
771         }
772         return NOTIFY_DONE;
773 }
774
775 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
776 static struct notifier_block uml_inetaddr_notifier = {
777         .notifier_call          = uml_inetaddr_event,
778 };
779
780 static void inet_register(void)
781 {
782         struct list_head *ele;
783         struct uml_net_private *lp;
784         struct in_device *ip;
785         struct in_ifaddr *in;
786
787         register_inetaddr_notifier(&uml_inetaddr_notifier);
788
789         /* Devices may have been opened already, so the uml_inetaddr_notifier
790          * didn't get a chance to run for them.  This fakes it so that
791          * addresses which have already been set up get handled properly.
792          */
793         spin_lock(&opened_lock);
794         list_for_each(ele, &opened) {
795                 lp = list_entry(ele, struct uml_net_private, list);
796                 ip = lp->dev->ip_ptr;
797                 if (ip == NULL)
798                         continue;
799                 in = ip->ifa_list;
800                 while (in != NULL) {
801                         uml_inetaddr_event(NULL, NETDEV_UP, in);
802                         in = in->ifa_next;
803                 }
804         }
805         spin_unlock(&opened_lock);
806 }
807 #else
808 static inline void inet_register(void)
809 {
810 }
811 #endif
812
813 static int uml_net_init(void)
814 {
815         mconsole_register_dev(&net_mc);
816         inet_register();
817         return 0;
818 }
819
820 __initcall(uml_net_init);
821
822 static void close_devices(void)
823 {
824         struct list_head *ele;
825         struct uml_net_private *lp;
826
827         spin_lock(&opened_lock);
828         list_for_each(ele, &opened) {
829                 lp = list_entry(ele, struct uml_net_private, list);
830                 um_free_irq(lp->dev->irq, lp->dev);
831                 if ((lp->close != NULL) && (lp->fd >= 0))
832                         (*lp->close)(lp->fd, &lp->user);
833                 if (lp->remove != NULL)
834                         (*lp->remove)(&lp->user);
835         }
836         spin_unlock(&opened_lock);
837 }
838
839 __uml_exitcall(close_devices);
840
841 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
842                                         void *),
843                     void *arg)
844 {
845         struct net_device *dev = d;
846         struct in_device *ip = dev->ip_ptr;
847         struct in_ifaddr *in;
848         unsigned char address[4], netmask[4];
849
850         if (ip == NULL) return;
851         in = ip->ifa_list;
852         while (in != NULL) {
853                 memcpy(address, &in->ifa_address, sizeof(address));
854                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
855                 (*cb)(address, netmask, arg);
856                 in = in->ifa_next;
857         }
858 }
859
860 int dev_netmask(void *d, void *m)
861 {
862         struct net_device *dev = d;
863         struct in_device *ip = dev->ip_ptr;
864         struct in_ifaddr *in;
865         __be32 *mask_out = m;
866
867         if (ip == NULL)
868                 return 1;
869
870         in = ip->ifa_list;
871         if (in == NULL)
872                 return 1;
873
874         *mask_out = in->ifa_mask;
875         return 0;
876 }
877
878 void *get_output_buffer(int *len_out)
879 {
880         void *ret;
881
882         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
883         if (ret) *len_out = PAGE_SIZE;
884         else *len_out = 0;
885         return ret;
886 }
887
888 void free_output_buffer(void *buffer)
889 {
890         free_pages((unsigned long) buffer, 0);
891 }
892
893 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
894                      char **gate_addr)
895 {
896         char *remain;
897
898         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
899         if (remain != NULL) {
900                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
901                        "specification : '%s'\n", remain);
902                 return 1;
903         }
904
905         return 0;
906 }
907
908 unsigned short eth_protocol(struct sk_buff *skb)
909 {
910         return eth_type_trans(skb, skb->dev);
911 }