Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6] / arch / um / drivers / net_kern.c
1 /*
2  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
3  * James Leu (jleu@mindspring.net).
4  * Copyright (C) 2001 by various other people who didn't put their name here.
5  * Licensed under the GPL.
6  */
7
8 #include "linux/kernel.h"
9 #include "linux/netdevice.h"
10 #include "linux/rtnetlink.h"
11 #include "linux/skbuff.h"
12 #include "linux/socket.h"
13 #include "linux/spinlock.h"
14 #include "linux/module.h"
15 #include "linux/init.h"
16 #include "linux/etherdevice.h"
17 #include "linux/list.h"
18 #include "linux/inetdevice.h"
19 #include "linux/ctype.h"
20 #include "linux/bootmem.h"
21 #include "linux/ethtool.h"
22 #include "linux/platform_device.h"
23 #include "asm/uaccess.h"
24 #include "kern_util.h"
25 #include "net_kern.h"
26 #include "net_user.h"
27 #include "mconsole_kern.h"
28 #include "init.h"
29 #include "irq_user.h"
30 #include "irq_kern.h"
31
32 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
33 {
34         memcpy(dev->dev_addr, addr, ETH_ALEN);
35 }
36
37 #define DRIVER_NAME "uml-netdev"
38
39 static DEFINE_SPINLOCK(opened_lock);
40 static LIST_HEAD(opened);
41
42 static int uml_net_rx(struct net_device *dev)
43 {
44         struct uml_net_private *lp = dev->priv;
45         int pkt_len;
46         struct sk_buff *skb;
47
48         /* If we can't allocate memory, try again next round. */
49         skb = dev_alloc_skb(dev->mtu);
50         if (skb == NULL) {
51                 lp->stats.rx_dropped++;
52                 return 0;
53         }
54
55         skb->dev = dev;
56         skb_put(skb, dev->mtu);
57         skb_reset_mac_header(skb);
58         pkt_len = (*lp->read)(lp->fd, &skb, lp);
59
60         if (pkt_len > 0) {
61                 skb_trim(skb, pkt_len);
62                 skb->protocol = (*lp->protocol)(skb);
63                 netif_rx(skb);
64
65                 lp->stats.rx_bytes += skb->len;
66                 lp->stats.rx_packets++;
67                 return pkt_len;
68         }
69
70         kfree_skb(skb);
71         return pkt_len;
72 }
73
74 static void uml_dev_close(struct work_struct *work)
75 {
76         struct uml_net_private *lp =
77                 container_of(work, struct uml_net_private, work);
78         dev_close(lp->dev);
79 }
80
81 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
82 {
83         struct net_device *dev = dev_id;
84         struct uml_net_private *lp = dev->priv;
85         int err;
86
87         if(!netif_running(dev))
88                 return(IRQ_NONE);
89
90         spin_lock(&lp->lock);
91         while((err = uml_net_rx(dev)) > 0) ;
92         if(err < 0) {
93                 printk(KERN_ERR
94                        "Device '%s' read returned %d, shutting it down\n",
95                        dev->name, err);
96                 /* dev_close can't be called in interrupt context, and takes
97                  * again lp->lock.
98                  * And dev_close() can be safely called multiple times on the
99                  * same device, since it tests for (dev->flags & IFF_UP). So
100                  * there's no harm in delaying the device shutdown.
101                  * Furthermore, the workqueue will not re-enqueue an already
102                  * enqueued work item. */
103                 schedule_work(&lp->work);
104                 goto out;
105         }
106         reactivate_fd(lp->fd, UM_ETH_IRQ);
107
108 out:
109         spin_unlock(&lp->lock);
110         return IRQ_HANDLED;
111 }
112
113 static int uml_net_open(struct net_device *dev)
114 {
115         struct uml_net_private *lp = dev->priv;
116         int err;
117
118         if(lp->fd >= 0){
119                 err = -ENXIO;
120                 goto out;
121         }
122
123         lp->fd = (*lp->open)(&lp->user);
124         if(lp->fd < 0){
125                 err = lp->fd;
126                 goto out;
127         }
128
129         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
130                              IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
131         if(err != 0){
132                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
133                 err = -ENETUNREACH;
134                 goto out_close;
135         }
136
137         lp->tl.data = (unsigned long) &lp->user;
138         netif_start_queue(dev);
139
140         /* clear buffer - it can happen that the host side of the interface
141          * is full when we get here.  In this case, new data is never queued,
142          * SIGIOs never arrive, and the net never works.
143          */
144         while((err = uml_net_rx(dev)) > 0) ;
145
146         spin_lock(&opened_lock);
147         list_add(&lp->list, &opened);
148         spin_unlock(&opened_lock);
149
150         return 0;
151 out_close:
152         if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
153         lp->fd = -1;
154 out:
155         return err;
156 }
157
158 static int uml_net_close(struct net_device *dev)
159 {
160         struct uml_net_private *lp = dev->priv;
161
162         netif_stop_queue(dev);
163
164         free_irq(dev->irq, dev);
165         if(lp->close != NULL)
166                 (*lp->close)(lp->fd, &lp->user);
167         lp->fd = -1;
168
169         spin_lock(&opened_lock);
170         list_del(&lp->list);
171         spin_unlock(&opened_lock);
172
173         return 0;
174 }
175
176 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
177 {
178         struct uml_net_private *lp = dev->priv;
179         unsigned long flags;
180         int len;
181
182         netif_stop_queue(dev);
183
184         spin_lock_irqsave(&lp->lock, flags);
185
186         len = (*lp->write)(lp->fd, &skb, lp);
187
188         if(len == skb->len) {
189                 lp->stats.tx_packets++;
190                 lp->stats.tx_bytes += skb->len;
191                 dev->trans_start = jiffies;
192                 netif_start_queue(dev);
193
194                 /* this is normally done in the interrupt when tx finishes */
195                 netif_wake_queue(dev);
196         }
197         else if(len == 0){
198                 netif_start_queue(dev);
199                 lp->stats.tx_dropped++;
200         }
201         else {
202                 netif_start_queue(dev);
203                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
204         }
205
206         spin_unlock_irqrestore(&lp->lock, flags);
207
208         dev_kfree_skb(skb);
209
210         return 0;
211 }
212
213 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
214 {
215         struct uml_net_private *lp = dev->priv;
216         return &lp->stats;
217 }
218
219 static void uml_net_set_multicast_list(struct net_device *dev)
220 {
221         if (dev->flags & IFF_PROMISC) return;
222         else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
223         else dev->flags &= ~IFF_ALLMULTI;
224 }
225
226 static void uml_net_tx_timeout(struct net_device *dev)
227 {
228         dev->trans_start = jiffies;
229         netif_wake_queue(dev);
230 }
231
232 static int uml_net_set_mac(struct net_device *dev, void *addr)
233 {
234         struct uml_net_private *lp = dev->priv;
235         struct sockaddr *hwaddr = addr;
236
237         spin_lock_irq(&lp->lock);
238         set_ether_mac(dev, hwaddr->sa_data);
239         spin_unlock_irq(&lp->lock);
240
241         return 0;
242 }
243
244 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
245 {
246         struct uml_net_private *lp = dev->priv;
247         int err = 0;
248
249         spin_lock_irq(&lp->lock);
250
251         new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
252         if(new_mtu < 0){
253                 err = new_mtu;
254                 goto out;
255         }
256
257         dev->mtu = new_mtu;
258
259  out:
260         spin_unlock_irq(&lp->lock);
261         return err;
262 }
263
264 static void uml_net_get_drvinfo(struct net_device *dev,
265                                 struct ethtool_drvinfo *info)
266 {
267         strcpy(info->driver, DRIVER_NAME);
268         strcpy(info->version, "42");
269 }
270
271 static struct ethtool_ops uml_net_ethtool_ops = {
272         .get_drvinfo    = uml_net_get_drvinfo,
273         .get_link       = ethtool_op_get_link,
274 };
275
276 void uml_net_user_timer_expire(unsigned long _conn)
277 {
278 #ifdef undef
279         struct connection *conn = (struct connection *)_conn;
280
281         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
282         do_connect(conn);
283 #endif
284 }
285
286 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
287 {
288         char *end;
289         int i;
290
291         if(str == NULL)
292                 goto random;
293
294         for(i=0;i<6;i++){
295                 addr[i] = simple_strtoul(str, &end, 16);
296                 if((end == str) ||
297                    ((*end != ':') && (*end != ',') && (*end != '\0'))){
298                         printk(KERN_ERR
299                                "setup_etheraddr: failed to parse '%s' "
300                                "as an ethernet address\n", str);
301                         goto random;
302                 }
303                 str = end + 1;
304         }
305         if (is_multicast_ether_addr(addr)) {
306                 printk(KERN_ERR
307                        "Attempt to assign a multicast ethernet address to a "
308                        "device disallowed\n");
309                 goto random;
310         }
311         if (!is_valid_ether_addr(addr)) {
312                 printk(KERN_ERR
313                        "Attempt to assign an invalid ethernet address to a "
314                        "device disallowed\n");
315                 goto random;
316         }
317         if (!is_local_ether_addr(addr)) {
318                 printk(KERN_WARNING
319                        "Warning: attempt to assign a globally valid ethernet "
320                        "address to a device\n");
321                 printk(KERN_WARNING "You should better enable the 2nd "
322                        "rightmost bit in the first byte of the MAC,\n");
323                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
324                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
325                        addr[5]);
326                 goto random;
327         }
328         return;
329
330 random:
331         printk(KERN_INFO
332                "Choosing a random ethernet address for device %s\n", name);
333         random_ether_addr(addr);
334 }
335
336 static DEFINE_SPINLOCK(devices_lock);
337 static LIST_HEAD(devices);
338
339 static struct platform_driver uml_net_driver = {
340         .driver = {
341                 .name  = DRIVER_NAME,
342         },
343 };
344 static int driver_registered;
345
346 static void net_device_release(struct device *dev)
347 {
348         struct uml_net *device = dev->driver_data;
349         struct net_device *netdev = device->dev;
350         struct uml_net_private *lp = netdev->priv;
351
352         if(lp->remove != NULL)
353                 (*lp->remove)(&lp->user);
354         list_del(&device->list);
355         kfree(device);
356         free_netdev(netdev);
357 }
358
359 static void eth_configure(int n, void *init, char *mac,
360                           struct transport *transport)
361 {
362         struct uml_net *device;
363         struct net_device *dev;
364         struct uml_net_private *lp;
365         int err, size;
366
367         size = transport->private_size + sizeof(struct uml_net_private);
368
369         device = kzalloc(sizeof(*device), GFP_KERNEL);
370         if (device == NULL) {
371                 printk(KERN_ERR "eth_configure failed to allocate struct "
372                        "uml_net\n");
373                 return;
374         }
375
376         dev = alloc_etherdev(size);
377         if (dev == NULL) {
378                 printk(KERN_ERR "eth_configure: failed to allocate struct "
379                        "net_device for eth%d\n", n);
380                 goto out_free_device;
381         }
382
383         INIT_LIST_HEAD(&device->list);
384         device->index = n;
385
386         /* If this name ends up conflicting with an existing registered
387          * netdevice, that is OK, register_netdev{,ice}() will notice this
388          * and fail.
389          */
390         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
391
392         setup_etheraddr(mac, device->mac, dev->name);
393
394         printk(KERN_INFO "Netdevice %d ", n);
395         printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
396                device->mac[0], device->mac[1],
397                device->mac[2], device->mac[3],
398                device->mac[4], device->mac[5]);
399         printk(": ");
400
401         lp = dev->priv;
402         /* This points to the transport private data. It's still clear, but we
403          * must memset it to 0 *now*. Let's help the drivers. */
404         memset(lp, 0, size);
405         INIT_WORK(&lp->work, uml_dev_close);
406
407         /* sysfs register */
408         if (!driver_registered) {
409                 platform_driver_register(&uml_net_driver);
410                 driver_registered = 1;
411         }
412         device->pdev.id = n;
413         device->pdev.name = DRIVER_NAME;
414         device->pdev.dev.release = net_device_release;
415         device->pdev.dev.driver_data = device;
416         if(platform_device_register(&device->pdev))
417                 goto out_free_netdev;
418         SET_NETDEV_DEV(dev,&device->pdev.dev);
419
420         device->dev = dev;
421
422         /*
423          * These just fill in a data structure, so there's no failure
424          * to be worried about.
425          */
426         (*transport->kern->init)(dev, init);
427
428         *lp = ((struct uml_net_private)
429                 { .list                 = LIST_HEAD_INIT(lp->list),
430                   .dev                  = dev,
431                   .fd                   = -1,
432                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
433                   .protocol             = transport->kern->protocol,
434                   .open                 = transport->user->open,
435                   .close                = transport->user->close,
436                   .remove               = transport->user->remove,
437                   .read                 = transport->kern->read,
438                   .write                = transport->kern->write,
439                   .add_address          = transport->user->add_address,
440                   .delete_address       = transport->user->delete_address,
441                   .set_mtu              = transport->user->set_mtu });
442
443         init_timer(&lp->tl);
444         spin_lock_init(&lp->lock);
445         lp->tl.function = uml_net_user_timer_expire;
446         memcpy(lp->mac, device->mac, sizeof(lp->mac));
447
448         if ((transport->user->init != NULL) &&
449             ((*transport->user->init)(&lp->user, dev) != 0))
450                 goto out_unregister;
451
452         set_ether_mac(dev, device->mac);
453         dev->mtu = transport->user->max_packet;
454         dev->open = uml_net_open;
455         dev->hard_start_xmit = uml_net_start_xmit;
456         dev->stop = uml_net_close;
457         dev->get_stats = uml_net_get_stats;
458         dev->set_multicast_list = uml_net_set_multicast_list;
459         dev->tx_timeout = uml_net_tx_timeout;
460         dev->set_mac_address = uml_net_set_mac;
461         dev->change_mtu = uml_net_change_mtu;
462         dev->ethtool_ops = &uml_net_ethtool_ops;
463         dev->watchdog_timeo = (HZ >> 1);
464         dev->irq = UM_ETH_IRQ;
465
466         rtnl_lock();
467         err = register_netdevice(dev);
468         rtnl_unlock();
469         if (err)
470                 goto out_undo_user_init;
471
472         spin_lock(&devices_lock);
473         list_add(&device->list, &devices);
474         spin_unlock(&devices_lock);
475
476         return;
477
478 out_undo_user_init:
479         if (transport->user->remove != NULL)
480                 (*transport->user->remove)(&lp->user);
481 out_unregister:
482         platform_device_unregister(&device->pdev);
483         return; /* platform_device_unregister frees dev and device */
484 out_free_netdev:
485         free_netdev(dev);
486 out_free_device:
487         kfree(device);
488 }
489
490 static struct uml_net *find_device(int n)
491 {
492         struct uml_net *device;
493         struct list_head *ele;
494
495         spin_lock(&devices_lock);
496         list_for_each(ele, &devices){
497                 device = list_entry(ele, struct uml_net, list);
498                 if(device->index == n)
499                         goto out;
500         }
501         device = NULL;
502  out:
503         spin_unlock(&devices_lock);
504         return device;
505 }
506
507 static int eth_parse(char *str, int *index_out, char **str_out,
508                      char **error_out)
509 {
510         char *end;
511         int n, err = -EINVAL;;
512
513         n = simple_strtoul(str, &end, 0);
514         if(end == str){
515                 *error_out = "Bad device number";
516                 return err;
517         }
518
519         str = end;
520         if(*str != '='){
521                 *error_out = "Expected '=' after device number";
522                 return err;
523         }
524
525         str++;
526         if(find_device(n)){
527                 *error_out = "Device already configured";
528                 return err;
529         }
530
531         *index_out = n;
532         *str_out = str;
533         return 0;
534 }
535
536 struct eth_init {
537         struct list_head list;
538         char *init;
539         int index;
540 };
541
542 static DEFINE_SPINLOCK(transports_lock);
543 static LIST_HEAD(transports);
544
545 /* Filled in during early boot */
546 static LIST_HEAD(eth_cmd_line);
547
548 static int check_transport(struct transport *transport, char *eth, int n,
549                            void **init_out, char **mac_out)
550 {
551         int len;
552
553         len = strlen(transport->name);
554         if(strncmp(eth, transport->name, len))
555                 return 0;
556
557         eth += len;
558         if(*eth == ',')
559                 eth++;
560         else if(*eth != '\0')
561                 return 0;
562
563         *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
564         if(*init_out == NULL)
565                 return 1;
566
567         if(!transport->setup(eth, mac_out, *init_out)){
568                 kfree(*init_out);
569                 *init_out = NULL;
570         }
571         return 1;
572 }
573
574 void register_transport(struct transport *new)
575 {
576         struct list_head *ele, *next;
577         struct eth_init *eth;
578         void *init;
579         char *mac = NULL;
580         int match;
581
582         spin_lock(&transports_lock);
583         BUG_ON(!list_empty(&new->list));
584         list_add(&new->list, &transports);
585         spin_unlock(&transports_lock);
586
587         list_for_each_safe(ele, next, &eth_cmd_line){
588                 eth = list_entry(ele, struct eth_init, list);
589                 match = check_transport(new, eth->init, eth->index, &init,
590                                         &mac);
591                 if(!match)
592                         continue;
593                 else if(init != NULL){
594                         eth_configure(eth->index, init, mac, new);
595                         kfree(init);
596                 }
597                 list_del(&eth->list);
598         }
599 }
600
601 static int eth_setup_common(char *str, int index)
602 {
603         struct list_head *ele;
604         struct transport *transport;
605         void *init;
606         char *mac = NULL;
607         int found = 0;
608
609         spin_lock(&transports_lock);
610         list_for_each(ele, &transports){
611                 transport = list_entry(ele, struct transport, list);
612                 if(!check_transport(transport, str, index, &init, &mac))
613                         continue;
614                 if(init != NULL){
615                         eth_configure(index, init, mac, transport);
616                         kfree(init);
617                 }
618                 found = 1;
619                 break;
620         }
621
622         spin_unlock(&transports_lock);
623         return found;
624 }
625
626 static int eth_setup(char *str)
627 {
628         struct eth_init *new;
629         char *error;
630         int n, err;
631
632         err = eth_parse(str, &n, &str, &error);
633         if(err){
634                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
635                        str, error);
636                 return 1;
637         }
638
639         new = alloc_bootmem(sizeof(*new));
640         if (new == NULL){
641                 printk("eth_init : alloc_bootmem failed\n");
642                 return 1;
643         }
644
645         INIT_LIST_HEAD(&new->list);
646         new->index = n;
647         new->init = str;
648
649         list_add_tail(&new->list, &eth_cmd_line);
650         return 1;
651 }
652
653 __setup("eth", eth_setup);
654 __uml_help(eth_setup,
655 "eth[0-9]+=<transport>,<options>\n"
656 "    Configure a network device.\n\n"
657 );
658
659 static int net_config(char *str, char **error_out)
660 {
661         int n, err;
662
663         err = eth_parse(str, &n, &str, error_out);
664         if(err)
665                 return err;
666
667         /* This string is broken up and the pieces used by the underlying
668          * driver.  So, it is freed only if eth_setup_common fails.
669          */
670         str = kstrdup(str, GFP_KERNEL);
671         if(str == NULL){
672                 *error_out = "net_config failed to strdup string";
673                 return -ENOMEM;
674         }
675         err = !eth_setup_common(str, n);
676         if(err)
677                 kfree(str);
678         return(err);
679 }
680
681 static int net_id(char **str, int *start_out, int *end_out)
682 {
683         char *end;
684         int n;
685
686         n = simple_strtoul(*str, &end, 0);
687         if((*end != '\0') || (end == *str))
688                 return -1;
689
690         *start_out = n;
691         *end_out = n;
692         *str = end;
693         return n;
694 }
695
696 static int net_remove(int n, char **error_out)
697 {
698         struct uml_net *device;
699         struct net_device *dev;
700         struct uml_net_private *lp;
701
702         device = find_device(n);
703         if(device == NULL)
704                 return -ENODEV;
705
706         dev = device->dev;
707         lp = dev->priv;
708         if(lp->fd > 0)
709                 return -EBUSY;
710         unregister_netdev(dev);
711         platform_device_unregister(&device->pdev);
712
713         return 0;
714 }
715
716 static struct mc_device net_mc = {
717         .list           = LIST_HEAD_INIT(net_mc.list),
718         .name           = "eth",
719         .config         = net_config,
720         .get_config     = NULL,
721         .id             = net_id,
722         .remove         = net_remove,
723 };
724
725 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
726                               void *ptr)
727 {
728         struct in_ifaddr *ifa = ptr;
729         struct net_device *dev = ifa->ifa_dev->dev;
730         struct uml_net_private *lp;
731         void (*proc)(unsigned char *, unsigned char *, void *);
732         unsigned char addr_buf[4], netmask_buf[4];
733
734         if(dev->open != uml_net_open)
735                 return NOTIFY_DONE;
736
737         lp = dev->priv;
738
739         proc = NULL;
740         switch (event){
741         case NETDEV_UP:
742                 proc = lp->add_address;
743                 break;
744         case NETDEV_DOWN:
745                 proc = lp->delete_address;
746                 break;
747         }
748         if(proc != NULL){
749                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
750                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
751                 (*proc)(addr_buf, netmask_buf, &lp->user);
752         }
753         return NOTIFY_DONE;
754 }
755
756 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
757 struct notifier_block uml_inetaddr_notifier = {
758         .notifier_call          = uml_inetaddr_event,
759 };
760
761 static int uml_net_init(void)
762 {
763         struct list_head *ele;
764         struct uml_net_private *lp;
765         struct in_device *ip;
766         struct in_ifaddr *in;
767
768         mconsole_register_dev(&net_mc);
769         register_inetaddr_notifier(&uml_inetaddr_notifier);
770
771         /* Devices may have been opened already, so the uml_inetaddr_notifier
772          * didn't get a chance to run for them.  This fakes it so that
773          * addresses which have already been set up get handled properly.
774          */
775         spin_lock(&opened_lock);
776         list_for_each(ele, &opened){
777                 lp = list_entry(ele, struct uml_net_private, list);
778                 ip = lp->dev->ip_ptr;
779                 if(ip == NULL)
780                         continue;
781                 in = ip->ifa_list;
782                 while(in != NULL){
783                         uml_inetaddr_event(NULL, NETDEV_UP, in);
784                         in = in->ifa_next;
785                 }
786         }
787         spin_unlock(&opened_lock);
788
789         return 0;
790 }
791
792 __initcall(uml_net_init);
793
794 static void close_devices(void)
795 {
796         struct list_head *ele;
797         struct uml_net_private *lp;
798
799         spin_lock(&opened_lock);
800         list_for_each(ele, &opened){
801                 lp = list_entry(ele, struct uml_net_private, list);
802                 free_irq(lp->dev->irq, lp->dev);
803                 if((lp->close != NULL) && (lp->fd >= 0))
804                         (*lp->close)(lp->fd, &lp->user);
805                 if(lp->remove != NULL)
806                         (*lp->remove)(&lp->user);
807         }
808         spin_unlock(&opened_lock);
809 }
810
811 __uml_exitcall(close_devices);
812
813 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
814 {
815         if((skb != NULL) && (skb_tailroom(skb) < extra)){
816                 struct sk_buff *skb2;
817
818                 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
819                 dev_kfree_skb(skb);
820                 skb = skb2;
821         }
822         if(skb != NULL) skb_put(skb, extra);
823         return(skb);
824 }
825
826 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
827                                         void *),
828                     void *arg)
829 {
830         struct net_device *dev = d;
831         struct in_device *ip = dev->ip_ptr;
832         struct in_ifaddr *in;
833         unsigned char address[4], netmask[4];
834
835         if(ip == NULL) return;
836         in = ip->ifa_list;
837         while(in != NULL){
838                 memcpy(address, &in->ifa_address, sizeof(address));
839                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
840                 (*cb)(address, netmask, arg);
841                 in = in->ifa_next;
842         }
843 }
844
845 int dev_netmask(void *d, void *m)
846 {
847         struct net_device *dev = d;
848         struct in_device *ip = dev->ip_ptr;
849         struct in_ifaddr *in;
850         __be32 *mask_out = m;
851
852         if(ip == NULL)
853                 return(1);
854
855         in = ip->ifa_list;
856         if(in == NULL)
857                 return(1);
858
859         *mask_out = in->ifa_mask;
860         return(0);
861 }
862
863 void *get_output_buffer(int *len_out)
864 {
865         void *ret;
866
867         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
868         if(ret) *len_out = PAGE_SIZE;
869         else *len_out = 0;
870         return ret;
871 }
872
873 void free_output_buffer(void *buffer)
874 {
875         free_pages((unsigned long) buffer, 0);
876 }
877
878 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
879                      char **gate_addr)
880 {
881         char *remain;
882
883         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
884         if(remain != NULL){
885                 printk("tap_setup_common - Extra garbage on specification : "
886                        "'%s'\n", remain);
887                 return(1);
888         }
889
890         return(0);
891 }
892
893 unsigned short eth_protocol(struct sk_buff *skb)
894 {
895         return(eth_type_trans(skb, skb->dev));
896 }