Merge branch 'linus' into core/softlockup
[linux-2.6] / arch / um / drivers / net_kern.c
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/spinlock.h>
20 #include "init.h"
21 #include "irq_kern.h"
22 #include "irq_user.h"
23 #include "mconsole_kern.h"
24 #include "net_kern.h"
25 #include "net_user.h"
26
27 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
28 {
29         memcpy(dev->dev_addr, addr, ETH_ALEN);
30 }
31
32 #define DRIVER_NAME "uml-netdev"
33
34 static DEFINE_SPINLOCK(opened_lock);
35 static LIST_HEAD(opened);
36
37 /*
38  * The drop_skb is used when we can't allocate an skb.  The
39  * packet is read into drop_skb in order to get the data off the
40  * connection to the host.
41  * It is reallocated whenever a maximum packet size is seen which is
42  * larger than any seen before.  update_drop_skb is called from
43  * eth_configure when a new interface is added.
44  */
45 static DEFINE_SPINLOCK(drop_lock);
46 static struct sk_buff *drop_skb;
47 static int drop_max;
48
49 static int update_drop_skb(int max)
50 {
51         struct sk_buff *new;
52         unsigned long flags;
53         int err = 0;
54
55         spin_lock_irqsave(&drop_lock, flags);
56
57         if (max <= drop_max)
58                 goto out;
59
60         err = -ENOMEM;
61         new = dev_alloc_skb(max);
62         if (new == NULL)
63                 goto out;
64
65         skb_put(new, max);
66
67         kfree_skb(drop_skb);
68         drop_skb = new;
69         drop_max = max;
70         err = 0;
71 out:
72         spin_unlock_irqrestore(&drop_lock, flags);
73
74         return err;
75 }
76
77 static int uml_net_rx(struct net_device *dev)
78 {
79         struct uml_net_private *lp = netdev_priv(dev);
80         int pkt_len;
81         struct sk_buff *skb;
82
83         /* If we can't allocate memory, try again next round. */
84         skb = dev_alloc_skb(lp->max_packet);
85         if (skb == NULL) {
86                 drop_skb->dev = dev;
87                 /* Read a packet into drop_skb and don't do anything with it. */
88                 (*lp->read)(lp->fd, drop_skb, lp);
89                 dev->stats.rx_dropped++;
90                 return 0;
91         }
92
93         skb->dev = dev;
94         skb_put(skb, lp->max_packet);
95         skb_reset_mac_header(skb);
96         pkt_len = (*lp->read)(lp->fd, skb, lp);
97
98         if (pkt_len > 0) {
99                 skb_trim(skb, pkt_len);
100                 skb->protocol = (*lp->protocol)(skb);
101
102                 dev->stats.rx_bytes += skb->len;
103                 dev->stats.rx_packets++;
104                 netif_rx(skb);
105                 return pkt_len;
106         }
107
108         kfree_skb(skb);
109         return pkt_len;
110 }
111
112 static void uml_dev_close(struct work_struct *work)
113 {
114         struct uml_net_private *lp =
115                 container_of(work, struct uml_net_private, work);
116         dev_close(lp->dev);
117 }
118
119 static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
120 {
121         struct net_device *dev = dev_id;
122         struct uml_net_private *lp = netdev_priv(dev);
123         int err;
124
125         if (!netif_running(dev))
126                 return IRQ_NONE;
127
128         spin_lock(&lp->lock);
129         while ((err = uml_net_rx(dev)) > 0) ;
130         if (err < 0) {
131                 printk(KERN_ERR
132                        "Device '%s' read returned %d, shutting it down\n",
133                        dev->name, err);
134                 /* dev_close can't be called in interrupt context, and takes
135                  * again lp->lock.
136                  * And dev_close() can be safely called multiple times on the
137                  * same device, since it tests for (dev->flags & IFF_UP). So
138                  * there's no harm in delaying the device shutdown.
139                  * Furthermore, the workqueue will not re-enqueue an already
140                  * enqueued work item. */
141                 schedule_work(&lp->work);
142                 goto out;
143         }
144         reactivate_fd(lp->fd, UM_ETH_IRQ);
145
146 out:
147         spin_unlock(&lp->lock);
148         return IRQ_HANDLED;
149 }
150
151 static int uml_net_open(struct net_device *dev)
152 {
153         struct uml_net_private *lp = netdev_priv(dev);
154         int err;
155
156         if (lp->fd >= 0) {
157                 err = -ENXIO;
158                 goto out;
159         }
160
161         lp->fd = (*lp->open)(&lp->user);
162         if (lp->fd < 0) {
163                 err = lp->fd;
164                 goto out;
165         }
166
167         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
168                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
169         if (err != 0) {
170                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
171                 err = -ENETUNREACH;
172                 goto out_close;
173         }
174
175         lp->tl.data = (unsigned long) &lp->user;
176         netif_start_queue(dev);
177
178         /* clear buffer - it can happen that the host side of the interface
179          * is full when we get here.  In this case, new data is never queued,
180          * SIGIOs never arrive, and the net never works.
181          */
182         while ((err = uml_net_rx(dev)) > 0) ;
183
184         spin_lock(&opened_lock);
185         list_add(&lp->list, &opened);
186         spin_unlock(&opened_lock);
187
188         return 0;
189 out_close:
190         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
191         lp->fd = -1;
192 out:
193         return err;
194 }
195
196 static int uml_net_close(struct net_device *dev)
197 {
198         struct uml_net_private *lp = netdev_priv(dev);
199
200         netif_stop_queue(dev);
201
202         free_irq(dev->irq, dev);
203         if (lp->close != NULL)
204                 (*lp->close)(lp->fd, &lp->user);
205         lp->fd = -1;
206
207         spin_lock(&opened_lock);
208         list_del(&lp->list);
209         spin_unlock(&opened_lock);
210
211         return 0;
212 }
213
214 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
215 {
216         struct uml_net_private *lp = netdev_priv(dev);
217         unsigned long flags;
218         int len;
219
220         netif_stop_queue(dev);
221
222         spin_lock_irqsave(&lp->lock, flags);
223
224         len = (*lp->write)(lp->fd, skb, lp);
225
226         if (len == skb->len) {
227                 dev->stats.tx_packets++;
228                 dev->stats.tx_bytes += skb->len;
229                 dev->trans_start = jiffies;
230                 netif_start_queue(dev);
231
232                 /* this is normally done in the interrupt when tx finishes */
233                 netif_wake_queue(dev);
234         }
235         else if (len == 0) {
236                 netif_start_queue(dev);
237                 dev->stats.tx_dropped++;
238         }
239         else {
240                 netif_start_queue(dev);
241                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
242         }
243
244         spin_unlock_irqrestore(&lp->lock, flags);
245
246         dev_kfree_skb(skb);
247
248         return 0;
249 }
250
251 static void uml_net_set_multicast_list(struct net_device *dev)
252 {
253         return;
254 }
255
256 static void uml_net_tx_timeout(struct net_device *dev)
257 {
258         dev->trans_start = jiffies;
259         netif_wake_queue(dev);
260 }
261
262 static int uml_net_set_mac(struct net_device *dev, void *addr)
263 {
264         struct uml_net_private *lp = netdev_priv(dev);
265         struct sockaddr *hwaddr = addr;
266
267         spin_lock_irq(&lp->lock);
268         set_ether_mac(dev, hwaddr->sa_data);
269         spin_unlock_irq(&lp->lock);
270
271         return 0;
272 }
273
274 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
275 {
276         dev->mtu = new_mtu;
277
278         return 0;
279 }
280
281 static void uml_net_get_drvinfo(struct net_device *dev,
282                                 struct ethtool_drvinfo *info)
283 {
284         strcpy(info->driver, DRIVER_NAME);
285         strcpy(info->version, "42");
286 }
287
288 static struct ethtool_ops uml_net_ethtool_ops = {
289         .get_drvinfo    = uml_net_get_drvinfo,
290         .get_link       = ethtool_op_get_link,
291 };
292
293 static void uml_net_user_timer_expire(unsigned long _conn)
294 {
295 #ifdef undef
296         struct connection *conn = (struct connection *)_conn;
297
298         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
299         do_connect(conn);
300 #endif
301 }
302
303 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
304 {
305         char *end;
306         int i;
307
308         if (str == NULL)
309                 goto random;
310
311         for (i = 0; i < 6; i++) {
312                 addr[i] = simple_strtoul(str, &end, 16);
313                 if ((end == str) ||
314                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
315                         printk(KERN_ERR
316                                "setup_etheraddr: failed to parse '%s' "
317                                "as an ethernet address\n", str);
318                         goto random;
319                 }
320                 str = end + 1;
321         }
322         if (is_multicast_ether_addr(addr)) {
323                 printk(KERN_ERR
324                        "Attempt to assign a multicast ethernet address to a "
325                        "device disallowed\n");
326                 goto random;
327         }
328         if (!is_valid_ether_addr(addr)) {
329                 printk(KERN_ERR
330                        "Attempt to assign an invalid ethernet address to a "
331                        "device disallowed\n");
332                 goto random;
333         }
334         if (!is_local_ether_addr(addr)) {
335                 printk(KERN_WARNING
336                        "Warning: Assigning a globally valid ethernet "
337                        "address to a device\n");
338                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
339                        "the first byte of the MAC,\n");
340                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
341                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
342                        addr[5]);
343         }
344         return;
345
346 random:
347         printk(KERN_INFO
348                "Choosing a random ethernet address for device %s\n", name);
349         random_ether_addr(addr);
350 }
351
352 static DEFINE_SPINLOCK(devices_lock);
353 static LIST_HEAD(devices);
354
355 static struct platform_driver uml_net_driver = {
356         .driver = {
357                 .name  = DRIVER_NAME,
358         },
359 };
360
361 static void net_device_release(struct device *dev)
362 {
363         struct uml_net *device = dev->driver_data;
364         struct net_device *netdev = device->dev;
365         struct uml_net_private *lp = netdev_priv(netdev);
366
367         if (lp->remove != NULL)
368                 (*lp->remove)(&lp->user);
369         list_del(&device->list);
370         kfree(device);
371         free_netdev(netdev);
372 }
373
374 static const struct net_device_ops uml_netdev_ops = {
375         .ndo_open               = uml_net_open,
376         .ndo_stop               = uml_net_close,
377         .ndo_start_xmit         = uml_net_start_xmit,
378         .ndo_set_multicast_list = uml_net_set_multicast_list,
379         .ndo_tx_timeout         = uml_net_tx_timeout,
380         .ndo_set_mac_address    = uml_net_set_mac,
381         .ndo_change_mtu         = uml_net_change_mtu,
382         .ndo_set_mac_address    = eth_mac_addr,
383         .ndo_validate_addr      = eth_validate_addr,
384 };
385
386 /*
387  * Ensures that platform_driver_register is called only once by
388  * eth_configure.  Will be set in an initcall.
389  */
390 static int driver_registered;
391
392 static void eth_configure(int n, void *init, char *mac,
393                           struct transport *transport)
394 {
395         struct uml_net *device;
396         struct net_device *dev;
397         struct uml_net_private *lp;
398         int err, size;
399
400         size = transport->private_size + sizeof(struct uml_net_private);
401
402         device = kzalloc(sizeof(*device), GFP_KERNEL);
403         if (device == NULL) {
404                 printk(KERN_ERR "eth_configure failed to allocate struct "
405                        "uml_net\n");
406                 return;
407         }
408
409         dev = alloc_etherdev(size);
410         if (dev == NULL) {
411                 printk(KERN_ERR "eth_configure: failed to allocate struct "
412                        "net_device for eth%d\n", n);
413                 goto out_free_device;
414         }
415
416         INIT_LIST_HEAD(&device->list);
417         device->index = n;
418
419         /* If this name ends up conflicting with an existing registered
420          * netdevice, that is OK, register_netdev{,ice}() will notice this
421          * and fail.
422          */
423         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
424
425         setup_etheraddr(mac, device->mac, dev->name);
426
427         printk(KERN_INFO "Netdevice %d (%pM) : ", n, device->mac);
428
429         lp = netdev_priv(dev);
430         /* This points to the transport private data. It's still clear, but we
431          * must memset it to 0 *now*. Let's help the drivers. */
432         memset(lp, 0, size);
433         INIT_WORK(&lp->work, uml_dev_close);
434
435         /* sysfs register */
436         if (!driver_registered) {
437                 platform_driver_register(&uml_net_driver);
438                 driver_registered = 1;
439         }
440         device->pdev.id = n;
441         device->pdev.name = DRIVER_NAME;
442         device->pdev.dev.release = net_device_release;
443         device->pdev.dev.driver_data = device;
444         if (platform_device_register(&device->pdev))
445                 goto out_free_netdev;
446         SET_NETDEV_DEV(dev,&device->pdev.dev);
447
448         device->dev = dev;
449
450         /*
451          * These just fill in a data structure, so there's no failure
452          * to be worried about.
453          */
454         (*transport->kern->init)(dev, init);
455
456         *lp = ((struct uml_net_private)
457                 { .list                 = LIST_HEAD_INIT(lp->list),
458                   .dev                  = dev,
459                   .fd                   = -1,
460                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
461                   .max_packet           = transport->user->max_packet,
462                   .protocol             = transport->kern->protocol,
463                   .open                 = transport->user->open,
464                   .close                = transport->user->close,
465                   .remove               = transport->user->remove,
466                   .read                 = transport->kern->read,
467                   .write                = transport->kern->write,
468                   .add_address          = transport->user->add_address,
469                   .delete_address       = transport->user->delete_address });
470
471         init_timer(&lp->tl);
472         spin_lock_init(&lp->lock);
473         lp->tl.function = uml_net_user_timer_expire;
474         memcpy(lp->mac, device->mac, sizeof(lp->mac));
475
476         if ((transport->user->init != NULL) &&
477             ((*transport->user->init)(&lp->user, dev) != 0))
478                 goto out_unregister;
479
480         set_ether_mac(dev, device->mac);
481         dev->mtu = transport->user->mtu;
482         dev->netdev_ops = &uml_netdev_ops;
483         dev->ethtool_ops = &uml_net_ethtool_ops;
484         dev->watchdog_timeo = (HZ >> 1);
485         dev->irq = UM_ETH_IRQ;
486
487         err = update_drop_skb(lp->max_packet);
488         if (err)
489                 goto out_undo_user_init;
490
491         rtnl_lock();
492         err = register_netdevice(dev);
493         rtnl_unlock();
494         if (err)
495                 goto out_undo_user_init;
496
497         spin_lock(&devices_lock);
498         list_add(&device->list, &devices);
499         spin_unlock(&devices_lock);
500
501         return;
502
503 out_undo_user_init:
504         if (transport->user->remove != NULL)
505                 (*transport->user->remove)(&lp->user);
506 out_unregister:
507         platform_device_unregister(&device->pdev);
508         return; /* platform_device_unregister frees dev and device */
509 out_free_netdev:
510         free_netdev(dev);
511 out_free_device:
512         kfree(device);
513 }
514
515 static struct uml_net *find_device(int n)
516 {
517         struct uml_net *device;
518         struct list_head *ele;
519
520         spin_lock(&devices_lock);
521         list_for_each(ele, &devices) {
522                 device = list_entry(ele, struct uml_net, list);
523                 if (device->index == n)
524                         goto out;
525         }
526         device = NULL;
527  out:
528         spin_unlock(&devices_lock);
529         return device;
530 }
531
532 static int eth_parse(char *str, int *index_out, char **str_out,
533                      char **error_out)
534 {
535         char *end;
536         int n, err = -EINVAL;;
537
538         n = simple_strtoul(str, &end, 0);
539         if (end == str) {
540                 *error_out = "Bad device number";
541                 return err;
542         }
543
544         str = end;
545         if (*str != '=') {
546                 *error_out = "Expected '=' after device number";
547                 return err;
548         }
549
550         str++;
551         if (find_device(n)) {
552                 *error_out = "Device already configured";
553                 return err;
554         }
555
556         *index_out = n;
557         *str_out = str;
558         return 0;
559 }
560
561 struct eth_init {
562         struct list_head list;
563         char *init;
564         int index;
565 };
566
567 static DEFINE_SPINLOCK(transports_lock);
568 static LIST_HEAD(transports);
569
570 /* Filled in during early boot */
571 static LIST_HEAD(eth_cmd_line);
572
573 static int check_transport(struct transport *transport, char *eth, int n,
574                            void **init_out, char **mac_out)
575 {
576         int len;
577
578         len = strlen(transport->name);
579         if (strncmp(eth, transport->name, len))
580                 return 0;
581
582         eth += len;
583         if (*eth == ',')
584                 eth++;
585         else if (*eth != '\0')
586                 return 0;
587
588         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
589         if (*init_out == NULL)
590                 return 1;
591
592         if (!transport->setup(eth, mac_out, *init_out)) {
593                 kfree(*init_out);
594                 *init_out = NULL;
595         }
596         return 1;
597 }
598
599 void register_transport(struct transport *new)
600 {
601         struct list_head *ele, *next;
602         struct eth_init *eth;
603         void *init;
604         char *mac = NULL;
605         int match;
606
607         spin_lock(&transports_lock);
608         BUG_ON(!list_empty(&new->list));
609         list_add(&new->list, &transports);
610         spin_unlock(&transports_lock);
611
612         list_for_each_safe(ele, next, &eth_cmd_line) {
613                 eth = list_entry(ele, struct eth_init, list);
614                 match = check_transport(new, eth->init, eth->index, &init,
615                                         &mac);
616                 if (!match)
617                         continue;
618                 else if (init != NULL) {
619                         eth_configure(eth->index, init, mac, new);
620                         kfree(init);
621                 }
622                 list_del(&eth->list);
623         }
624 }
625
626 static int eth_setup_common(char *str, int index)
627 {
628         struct list_head *ele;
629         struct transport *transport;
630         void *init;
631         char *mac = NULL;
632         int found = 0;
633
634         spin_lock(&transports_lock);
635         list_for_each(ele, &transports) {
636                 transport = list_entry(ele, struct transport, list);
637                 if (!check_transport(transport, str, index, &init, &mac))
638                         continue;
639                 if (init != NULL) {
640                         eth_configure(index, init, mac, transport);
641                         kfree(init);
642                 }
643                 found = 1;
644                 break;
645         }
646
647         spin_unlock(&transports_lock);
648         return found;
649 }
650
651 static int __init eth_setup(char *str)
652 {
653         struct eth_init *new;
654         char *error;
655         int n, err;
656
657         err = eth_parse(str, &n, &str, &error);
658         if (err) {
659                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
660                        str, error);
661                 return 1;
662         }
663
664         new = alloc_bootmem(sizeof(*new));
665         if (new == NULL) {
666                 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
667                 return 1;
668         }
669
670         INIT_LIST_HEAD(&new->list);
671         new->index = n;
672         new->init = str;
673
674         list_add_tail(&new->list, &eth_cmd_line);
675         return 1;
676 }
677
678 __setup("eth", eth_setup);
679 __uml_help(eth_setup,
680 "eth[0-9]+=<transport>,<options>\n"
681 "    Configure a network device.\n\n"
682 );
683
684 static int net_config(char *str, char **error_out)
685 {
686         int n, err;
687
688         err = eth_parse(str, &n, &str, error_out);
689         if (err)
690                 return err;
691
692         /* This string is broken up and the pieces used by the underlying
693          * driver.  So, it is freed only if eth_setup_common fails.
694          */
695         str = kstrdup(str, GFP_KERNEL);
696         if (str == NULL) {
697                 *error_out = "net_config failed to strdup string";
698                 return -ENOMEM;
699         }
700         err = !eth_setup_common(str, n);
701         if (err)
702                 kfree(str);
703         return err;
704 }
705
706 static int net_id(char **str, int *start_out, int *end_out)
707 {
708         char *end;
709         int n;
710
711         n = simple_strtoul(*str, &end, 0);
712         if ((*end != '\0') || (end == *str))
713                 return -1;
714
715         *start_out = n;
716         *end_out = n;
717         *str = end;
718         return n;
719 }
720
721 static int net_remove(int n, char **error_out)
722 {
723         struct uml_net *device;
724         struct net_device *dev;
725         struct uml_net_private *lp;
726
727         device = find_device(n);
728         if (device == NULL)
729                 return -ENODEV;
730
731         dev = device->dev;
732         lp = netdev_priv(dev);
733         if (lp->fd > 0)
734                 return -EBUSY;
735         unregister_netdev(dev);
736         platform_device_unregister(&device->pdev);
737
738         return 0;
739 }
740
741 static struct mc_device net_mc = {
742         .list           = LIST_HEAD_INIT(net_mc.list),
743         .name           = "eth",
744         .config         = net_config,
745         .get_config     = NULL,
746         .id             = net_id,
747         .remove         = net_remove,
748 };
749
750 #ifdef CONFIG_INET
751 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
752                               void *ptr)
753 {
754         struct in_ifaddr *ifa = ptr;
755         struct net_device *dev = ifa->ifa_dev->dev;
756         struct uml_net_private *lp;
757         void (*proc)(unsigned char *, unsigned char *, void *);
758         unsigned char addr_buf[4], netmask_buf[4];
759
760         if (dev->netdev_ops->ndo_open != uml_net_open)
761                 return NOTIFY_DONE;
762
763         lp = netdev_priv(dev);
764
765         proc = NULL;
766         switch (event) {
767         case NETDEV_UP:
768                 proc = lp->add_address;
769                 break;
770         case NETDEV_DOWN:
771                 proc = lp->delete_address;
772                 break;
773         }
774         if (proc != NULL) {
775                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
776                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
777                 (*proc)(addr_buf, netmask_buf, &lp->user);
778         }
779         return NOTIFY_DONE;
780 }
781
782 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
783 static struct notifier_block uml_inetaddr_notifier = {
784         .notifier_call          = uml_inetaddr_event,
785 };
786
787 static void inet_register(void)
788 {
789         struct list_head *ele;
790         struct uml_net_private *lp;
791         struct in_device *ip;
792         struct in_ifaddr *in;
793
794         register_inetaddr_notifier(&uml_inetaddr_notifier);
795
796         /* Devices may have been opened already, so the uml_inetaddr_notifier
797          * didn't get a chance to run for them.  This fakes it so that
798          * addresses which have already been set up get handled properly.
799          */
800         spin_lock(&opened_lock);
801         list_for_each(ele, &opened) {
802                 lp = list_entry(ele, struct uml_net_private, list);
803                 ip = lp->dev->ip_ptr;
804                 if (ip == NULL)
805                         continue;
806                 in = ip->ifa_list;
807                 while (in != NULL) {
808                         uml_inetaddr_event(NULL, NETDEV_UP, in);
809                         in = in->ifa_next;
810                 }
811         }
812         spin_unlock(&opened_lock);
813 }
814 #else
815 static inline void inet_register(void)
816 {
817 }
818 #endif
819
820 static int uml_net_init(void)
821 {
822         mconsole_register_dev(&net_mc);
823         inet_register();
824         return 0;
825 }
826
827 __initcall(uml_net_init);
828
829 static void close_devices(void)
830 {
831         struct list_head *ele;
832         struct uml_net_private *lp;
833
834         spin_lock(&opened_lock);
835         list_for_each(ele, &opened) {
836                 lp = list_entry(ele, struct uml_net_private, list);
837                 free_irq(lp->dev->irq, lp->dev);
838                 if ((lp->close != NULL) && (lp->fd >= 0))
839                         (*lp->close)(lp->fd, &lp->user);
840                 if (lp->remove != NULL)
841                         (*lp->remove)(&lp->user);
842         }
843         spin_unlock(&opened_lock);
844 }
845
846 __uml_exitcall(close_devices);
847
848 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
849                                         void *),
850                     void *arg)
851 {
852         struct net_device *dev = d;
853         struct in_device *ip = dev->ip_ptr;
854         struct in_ifaddr *in;
855         unsigned char address[4], netmask[4];
856
857         if (ip == NULL) return;
858         in = ip->ifa_list;
859         while (in != NULL) {
860                 memcpy(address, &in->ifa_address, sizeof(address));
861                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
862                 (*cb)(address, netmask, arg);
863                 in = in->ifa_next;
864         }
865 }
866
867 int dev_netmask(void *d, void *m)
868 {
869         struct net_device *dev = d;
870         struct in_device *ip = dev->ip_ptr;
871         struct in_ifaddr *in;
872         __be32 *mask_out = m;
873
874         if (ip == NULL)
875                 return 1;
876
877         in = ip->ifa_list;
878         if (in == NULL)
879                 return 1;
880
881         *mask_out = in->ifa_mask;
882         return 0;
883 }
884
885 void *get_output_buffer(int *len_out)
886 {
887         void *ret;
888
889         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
890         if (ret) *len_out = PAGE_SIZE;
891         else *len_out = 0;
892         return ret;
893 }
894
895 void free_output_buffer(void *buffer)
896 {
897         free_pages((unsigned long) buffer, 0);
898 }
899
900 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
901                      char **gate_addr)
902 {
903         char *remain;
904
905         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
906         if (remain != NULL) {
907                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
908                        "specification : '%s'\n", remain);
909                 return 1;
910         }
911
912         return 0;
913 }
914
915 unsigned short eth_protocol(struct sk_buff *skb)
916 {
917         return eth_type_trans(skb, skb->dev);
918 }