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TOMOYO Linux Cross Reference
Linux/arch/um/drivers/net_kern.c

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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                 netif_trans_update(dev);
227                 netif_start_queue(dev);
228 
229                 /* this is normally done in the interrupt when tx finishes */
230                 netif_wake_queue(dev);
231         }
232         else if (len == 0) {
233                 netif_start_queue(dev);
234                 dev->stats.tx_dropped++;
235         }
236         else {
237                 netif_start_queue(dev);
238                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
239         }
240 
241         spin_unlock_irqrestore(&lp->lock, flags);
242 
243         dev_consume_skb_any(skb);
244 
245         return NETDEV_TX_OK;
246 }
247 
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         netif_trans_update(dev);
256         netif_wake_queue(dev);
257 }
258 
259 #ifdef CONFIG_NET_POLL_CONTROLLER
260 static void uml_net_poll_controller(struct net_device *dev)
261 {
262         disable_irq(dev->irq);
263         uml_net_interrupt(dev->irq, dev);
264         enable_irq(dev->irq);
265 }
266 #endif
267 
268 static void uml_net_get_drvinfo(struct net_device *dev,
269                                 struct ethtool_drvinfo *info)
270 {
271         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
272         strlcpy(info->version, "42", sizeof(info->version));
273 }
274 
275 static const struct ethtool_ops uml_net_ethtool_ops = {
276         .get_drvinfo    = uml_net_get_drvinfo,
277         .get_link       = ethtool_op_get_link,
278         .get_ts_info    = ethtool_op_get_ts_info,
279 };
280 
281 static void uml_net_user_timer_expire(unsigned long _conn)
282 {
283 #ifdef undef
284         struct connection *conn = (struct connection *)_conn;
285 
286         dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
287         do_connect(conn);
288 #endif
289 }
290 
291 static void setup_etheraddr(struct net_device *dev, char *str)
292 {
293         unsigned char *addr = dev->dev_addr;
294         char *end;
295         int i;
296 
297         if (str == NULL)
298                 goto random;
299 
300         for (i = 0; i < 6; i++) {
301                 addr[i] = simple_strtoul(str, &end, 16);
302                 if ((end == str) ||
303                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
304                         printk(KERN_ERR
305                                "setup_etheraddr: failed to parse '%s' "
306                                "as an ethernet address\n", str);
307                         goto random;
308                 }
309                 str = end + 1;
310         }
311         if (is_multicast_ether_addr(addr)) {
312                 printk(KERN_ERR
313                        "Attempt to assign a multicast ethernet address to a "
314                        "device disallowed\n");
315                 goto random;
316         }
317         if (!is_valid_ether_addr(addr)) {
318                 printk(KERN_ERR
319                        "Attempt to assign an invalid ethernet address to a "
320                        "device disallowed\n");
321                 goto random;
322         }
323         if (!is_local_ether_addr(addr)) {
324                 printk(KERN_WARNING
325                        "Warning: Assigning a globally valid ethernet "
326                        "address to a device\n");
327                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
328                        "the first byte of the MAC,\n");
329                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
330                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
331                        addr[5]);
332         }
333         return;
334 
335 random:
336         printk(KERN_INFO
337                "Choosing a random ethernet address for device %s\n", dev->name);
338         eth_hw_addr_random(dev);
339 }
340 
341 static DEFINE_SPINLOCK(devices_lock);
342 static LIST_HEAD(devices);
343 
344 static struct platform_driver uml_net_driver = {
345         .driver = {
346                 .name  = DRIVER_NAME,
347         },
348 };
349 
350 static void net_device_release(struct device *dev)
351 {
352         struct uml_net *device = dev_get_drvdata(dev);
353         struct net_device *netdev = device->dev;
354         struct uml_net_private *lp = netdev_priv(netdev);
355 
356         if (lp->remove != NULL)
357                 (*lp->remove)(&lp->user);
358         list_del(&device->list);
359         kfree(device);
360         free_netdev(netdev);
361 }
362 
363 static const struct net_device_ops uml_netdev_ops = {
364         .ndo_open               = uml_net_open,
365         .ndo_stop               = uml_net_close,
366         .ndo_start_xmit         = uml_net_start_xmit,
367         .ndo_set_rx_mode        = uml_net_set_multicast_list,
368         .ndo_tx_timeout         = uml_net_tx_timeout,
369         .ndo_set_mac_address    = eth_mac_addr,
370         .ndo_validate_addr      = eth_validate_addr,
371 #ifdef CONFIG_NET_POLL_CONTROLLER
372         .ndo_poll_controller = uml_net_poll_controller,
373 #endif
374 };
375 
376 /*
377  * Ensures that platform_driver_register is called only once by
378  * eth_configure.  Will be set in an initcall.
379  */
380 static int driver_registered;
381 
382 static void eth_configure(int n, void *init, char *mac,
383                           struct transport *transport, gfp_t gfp_mask)
384 {
385         struct uml_net *device;
386         struct net_device *dev;
387         struct uml_net_private *lp;
388         int err, size;
389 
390         size = transport->private_size + sizeof(struct uml_net_private);
391 
392         device = kzalloc(sizeof(*device), gfp_mask);
393         if (device == NULL) {
394                 printk(KERN_ERR "eth_configure failed to allocate struct "
395                        "uml_net\n");
396                 return;
397         }
398 
399         dev = alloc_etherdev(size);
400         if (dev == NULL) {
401                 printk(KERN_ERR "eth_configure: failed to allocate struct "
402                        "net_device for eth%d\n", n);
403                 goto out_free_device;
404         }
405 
406         INIT_LIST_HEAD(&device->list);
407         device->index = n;
408 
409         /* If this name ends up conflicting with an existing registered
410          * netdevice, that is OK, register_netdev{,ice}() will notice this
411          * and fail.
412          */
413         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
414 
415         setup_etheraddr(dev, mac);
416 
417         printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
418 
419         lp = netdev_priv(dev);
420         /* This points to the transport private data. It's still clear, but we
421          * must memset it to 0 *now*. Let's help the drivers. */
422         memset(lp, 0, size);
423         INIT_WORK(&lp->work, uml_dev_close);
424 
425         /* sysfs register */
426         if (!driver_registered) {
427                 platform_driver_register(&uml_net_driver);
428                 driver_registered = 1;
429         }
430         device->pdev.id = n;
431         device->pdev.name = DRIVER_NAME;
432         device->pdev.dev.release = net_device_release;
433         dev_set_drvdata(&device->pdev.dev, device);
434         if (platform_device_register(&device->pdev))
435                 goto out_free_netdev;
436         SET_NETDEV_DEV(dev,&device->pdev.dev);
437 
438         device->dev = dev;
439 
440         /*
441          * These just fill in a data structure, so there's no failure
442          * to be worried about.
443          */
444         (*transport->kern->init)(dev, init);
445 
446         *lp = ((struct uml_net_private)
447                 { .list                 = LIST_HEAD_INIT(lp->list),
448                   .dev                  = dev,
449                   .fd                   = -1,
450                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
451                   .max_packet           = transport->user->max_packet,
452                   .protocol             = transport->kern->protocol,
453                   .open                 = transport->user->open,
454                   .close                = transport->user->close,
455                   .remove               = transport->user->remove,
456                   .read                 = transport->kern->read,
457                   .write                = transport->kern->write,
458                   .add_address          = transport->user->add_address,
459                   .delete_address       = transport->user->delete_address });
460 
461         init_timer(&lp->tl);
462         spin_lock_init(&lp->lock);
463         lp->tl.function = uml_net_user_timer_expire;
464         memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
465 
466         if ((transport->user->init != NULL) &&
467             ((*transport->user->init)(&lp->user, dev) != 0))
468                 goto out_unregister;
469 
470         dev->mtu = transport->user->mtu;
471         dev->netdev_ops = &uml_netdev_ops;
472         dev->ethtool_ops = &uml_net_ethtool_ops;
473         dev->watchdog_timeo = (HZ >> 1);
474         dev->irq = UM_ETH_IRQ;
475 
476         err = update_drop_skb(lp->max_packet);
477         if (err)
478                 goto out_undo_user_init;
479 
480         rtnl_lock();
481         err = register_netdevice(dev);
482         rtnl_unlock();
483         if (err)
484                 goto out_undo_user_init;
485 
486         spin_lock(&devices_lock);
487         list_add(&device->list, &devices);
488         spin_unlock(&devices_lock);
489 
490         return;
491 
492 out_undo_user_init:
493         if (transport->user->remove != NULL)
494                 (*transport->user->remove)(&lp->user);
495 out_unregister:
496         platform_device_unregister(&device->pdev);
497         return; /* platform_device_unregister frees dev and device */
498 out_free_netdev:
499         free_netdev(dev);
500 out_free_device:
501         kfree(device);
502 }
503 
504 static struct uml_net *find_device(int n)
505 {
506         struct uml_net *device;
507         struct list_head *ele;
508 
509         spin_lock(&devices_lock);
510         list_for_each(ele, &devices) {
511                 device = list_entry(ele, struct uml_net, list);
512                 if (device->index == n)
513                         goto out;
514         }
515         device = NULL;
516  out:
517         spin_unlock(&devices_lock);
518         return device;
519 }
520 
521 static int eth_parse(char *str, int *index_out, char **str_out,
522                      char **error_out)
523 {
524         char *end;
525         int n, err = -EINVAL;
526 
527         n = simple_strtoul(str, &end, 0);
528         if (end == str) {
529                 *error_out = "Bad device number";
530                 return err;
531         }
532 
533         str = end;
534         if (*str != '=') {
535                 *error_out = "Expected '=' after device number";
536                 return err;
537         }
538 
539         str++;
540         if (find_device(n)) {
541                 *error_out = "Device already configured";
542                 return err;
543         }
544 
545         *index_out = n;
546         *str_out = str;
547         return 0;
548 }
549 
550 struct eth_init {
551         struct list_head list;
552         char *init;
553         int index;
554 };
555 
556 static DEFINE_SPINLOCK(transports_lock);
557 static LIST_HEAD(transports);
558 
559 /* Filled in during early boot */
560 static LIST_HEAD(eth_cmd_line);
561 
562 static int check_transport(struct transport *transport, char *eth, int n,
563                            void **init_out, char **mac_out, gfp_t gfp_mask)
564 {
565         int len;
566 
567         len = strlen(transport->name);
568         if (strncmp(eth, transport->name, len))
569                 return 0;
570 
571         eth += len;
572         if (*eth == ',')
573                 eth++;
574         else if (*eth != '\0')
575                 return 0;
576 
577         *init_out = kmalloc(transport->setup_size, gfp_mask);
578         if (*init_out == NULL)
579                 return 1;
580 
581         if (!transport->setup(eth, mac_out, *init_out)) {
582                 kfree(*init_out);
583                 *init_out = NULL;
584         }
585         return 1;
586 }
587 
588 void register_transport(struct transport *new)
589 {
590         struct list_head *ele, *next;
591         struct eth_init *eth;
592         void *init;
593         char *mac = NULL;
594         int match;
595 
596         spin_lock(&transports_lock);
597         BUG_ON(!list_empty(&new->list));
598         list_add(&new->list, &transports);
599         spin_unlock(&transports_lock);
600 
601         list_for_each_safe(ele, next, &eth_cmd_line) {
602                 eth = list_entry(ele, struct eth_init, list);
603                 match = check_transport(new, eth->init, eth->index, &init,
604                                         &mac, GFP_KERNEL);
605                 if (!match)
606                         continue;
607                 else if (init != NULL) {
608                         eth_configure(eth->index, init, mac, new, GFP_KERNEL);
609                         kfree(init);
610                 }
611                 list_del(&eth->list);
612         }
613 }
614 
615 static int eth_setup_common(char *str, int index)
616 {
617         struct list_head *ele;
618         struct transport *transport;
619         void *init;
620         char *mac = NULL;
621         int found = 0;
622 
623         spin_lock(&transports_lock);
624         list_for_each(ele, &transports) {
625                 transport = list_entry(ele, struct transport, list);
626                 if (!check_transport(transport, str, index, &init,
627                                         &mac, GFP_ATOMIC))
628                         continue;
629                 if (init != NULL) {
630                         eth_configure(index, init, mac, transport, GFP_ATOMIC);
631                         kfree(init);
632                 }
633                 found = 1;
634                 break;
635         }
636 
637         spin_unlock(&transports_lock);
638         return found;
639 }
640 
641 static int __init eth_setup(char *str)
642 {
643         struct eth_init *new;
644         char *error;
645         int n, err;
646 
647         err = eth_parse(str, &n, &str, &error);
648         if (err) {
649                 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
650                        str, error);
651                 return 1;
652         }
653 
654         new = alloc_bootmem(sizeof(*new));
655 
656         INIT_LIST_HEAD(&new->list);
657         new->index = n;
658         new->init = str;
659 
660         list_add_tail(&new->list, &eth_cmd_line);
661         return 1;
662 }
663 
664 __setup("eth", eth_setup);
665 __uml_help(eth_setup,
666 "eth[0-9]+=<transport>,<options>\n"
667 "    Configure a network device.\n\n"
668 );
669 
670 static int net_config(char *str, char **error_out)
671 {
672         int n, err;
673 
674         err = eth_parse(str, &n, &str, error_out);
675         if (err)
676                 return err;
677 
678         /* This string is broken up and the pieces used by the underlying
679          * driver.  So, it is freed only if eth_setup_common fails.
680          */
681         str = kstrdup(str, GFP_KERNEL);
682         if (str == NULL) {
683                 *error_out = "net_config failed to strdup string";
684                 return -ENOMEM;
685         }
686         err = !eth_setup_common(str, n);
687         if (err)
688                 kfree(str);
689         return err;
690 }
691 
692 static int net_id(char **str, int *start_out, int *end_out)
693 {
694         char *end;
695         int n;
696 
697         n = simple_strtoul(*str, &end, 0);
698         if ((*end != '\0') || (end == *str))
699                 return -1;
700 
701         *start_out = n;
702         *end_out = n;
703         *str = end;
704         return n;
705 }
706 
707 static int net_remove(int n, char **error_out)
708 {
709         struct uml_net *device;
710         struct net_device *dev;
711         struct uml_net_private *lp;
712 
713         device = find_device(n);
714         if (device == NULL)
715                 return -ENODEV;
716 
717         dev = device->dev;
718         lp = netdev_priv(dev);
719         if (lp->fd > 0)
720                 return -EBUSY;
721         unregister_netdev(dev);
722         platform_device_unregister(&device->pdev);
723 
724         return 0;
725 }
726 
727 static struct mc_device net_mc = {
728         .list           = LIST_HEAD_INIT(net_mc.list),
729         .name           = "eth",
730         .config         = net_config,
731         .get_config     = NULL,
732         .id             = net_id,
733         .remove         = net_remove,
734 };
735 
736 #ifdef CONFIG_INET
737 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
738                               void *ptr)
739 {
740         struct in_ifaddr *ifa = ptr;
741         struct net_device *dev = ifa->ifa_dev->dev;
742         struct uml_net_private *lp;
743         void (*proc)(unsigned char *, unsigned char *, void *);
744         unsigned char addr_buf[4], netmask_buf[4];
745 
746         if (dev->netdev_ops->ndo_open != uml_net_open)
747                 return NOTIFY_DONE;
748 
749         lp = netdev_priv(dev);
750 
751         proc = NULL;
752         switch (event) {
753         case NETDEV_UP:
754                 proc = lp->add_address;
755                 break;
756         case NETDEV_DOWN:
757                 proc = lp->delete_address;
758                 break;
759         }
760         if (proc != NULL) {
761                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
762                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
763                 (*proc)(addr_buf, netmask_buf, &lp->user);
764         }
765         return NOTIFY_DONE;
766 }
767 
768 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
769 static struct notifier_block uml_inetaddr_notifier = {
770         .notifier_call          = uml_inetaddr_event,
771 };
772 
773 static void inet_register(void)
774 {
775         struct list_head *ele;
776         struct uml_net_private *lp;
777         struct in_device *ip;
778         struct in_ifaddr *in;
779 
780         register_inetaddr_notifier(&uml_inetaddr_notifier);
781 
782         /* Devices may have been opened already, so the uml_inetaddr_notifier
783          * didn't get a chance to run for them.  This fakes it so that
784          * addresses which have already been set up get handled properly.
785          */
786         spin_lock(&opened_lock);
787         list_for_each(ele, &opened) {
788                 lp = list_entry(ele, struct uml_net_private, list);
789                 ip = lp->dev->ip_ptr;
790                 if (ip == NULL)
791                         continue;
792                 in = ip->ifa_list;
793                 while (in != NULL) {
794                         uml_inetaddr_event(NULL, NETDEV_UP, in);
795                         in = in->ifa_next;
796                 }
797         }
798         spin_unlock(&opened_lock);
799 }
800 #else
801 static inline void inet_register(void)
802 {
803 }
804 #endif
805 
806 static int uml_net_init(void)
807 {
808         mconsole_register_dev(&net_mc);
809         inet_register();
810         return 0;
811 }
812 
813 __initcall(uml_net_init);
814 
815 static void close_devices(void)
816 {
817         struct list_head *ele;
818         struct uml_net_private *lp;
819 
820         spin_lock(&opened_lock);
821         list_for_each(ele, &opened) {
822                 lp = list_entry(ele, struct uml_net_private, list);
823                 um_free_irq(lp->dev->irq, lp->dev);
824                 if ((lp->close != NULL) && (lp->fd >= 0))
825                         (*lp->close)(lp->fd, &lp->user);
826                 if (lp->remove != NULL)
827                         (*lp->remove)(&lp->user);
828         }
829         spin_unlock(&opened_lock);
830 }
831 
832 __uml_exitcall(close_devices);
833 
834 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
835                                         void *),
836                     void *arg)
837 {
838         struct net_device *dev = d;
839         struct in_device *ip = dev->ip_ptr;
840         struct in_ifaddr *in;
841         unsigned char address[4], netmask[4];
842 
843         if (ip == NULL) return;
844         in = ip->ifa_list;
845         while (in != NULL) {
846                 memcpy(address, &in->ifa_address, sizeof(address));
847                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
848                 (*cb)(address, netmask, arg);
849                 in = in->ifa_next;
850         }
851 }
852 
853 int dev_netmask(void *d, void *m)
854 {
855         struct net_device *dev = d;
856         struct in_device *ip = dev->ip_ptr;
857         struct in_ifaddr *in;
858         __be32 *mask_out = m;
859 
860         if (ip == NULL)
861                 return 1;
862 
863         in = ip->ifa_list;
864         if (in == NULL)
865                 return 1;
866 
867         *mask_out = in->ifa_mask;
868         return 0;
869 }
870 
871 void *get_output_buffer(int *len_out)
872 {
873         void *ret;
874 
875         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
876         if (ret) *len_out = PAGE_SIZE;
877         else *len_out = 0;
878         return ret;
879 }
880 
881 void free_output_buffer(void *buffer)
882 {
883         free_pages((unsigned long) buffer, 0);
884 }
885 
886 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
887                      char **gate_addr)
888 {
889         char *remain;
890 
891         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
892         if (remain != NULL) {
893                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
894                        "specification : '%s'\n", remain);
895                 return 1;
896         }
897 
898         return 0;
899 }
900 
901 unsigned short eth_protocol(struct sk_buff *skb)
902 {
903         return eth_type_trans(skb, skb->dev);
904 }
905 

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