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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                 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         if (new == NULL) {
663                 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
664                 return 1;
665         }
666 
667         INIT_LIST_HEAD(&new->list);
668         new->index = n;
669         new->init = str;
670 
671         list_add_tail(&new->list, &eth_cmd_line);
672         return 1;
673 }
674 
675 __setup("eth", eth_setup);
676 __uml_help(eth_setup,
677 "eth[0-9]+=<transport>,<options>\n"
678 "    Configure a network device.\n\n"
679 );
680 
681 static int net_config(char *str, char **error_out)
682 {
683         int n, err;
684 
685         err = eth_parse(str, &n, &str, error_out);
686         if (err)
687                 return err;
688 
689         /* This string is broken up and the pieces used by the underlying
690          * driver.  So, it is freed only if eth_setup_common fails.
691          */
692         str = kstrdup(str, GFP_KERNEL);
693         if (str == NULL) {
694                 *error_out = "net_config failed to strdup string";
695                 return -ENOMEM;
696         }
697         err = !eth_setup_common(str, n);
698         if (err)
699                 kfree(str);
700         return err;
701 }
702 
703 static int net_id(char **str, int *start_out, int *end_out)
704 {
705         char *end;
706         int n;
707 
708         n = simple_strtoul(*str, &end, 0);
709         if ((*end != '\0') || (end == *str))
710                 return -1;
711 
712         *start_out = n;
713         *end_out = n;
714         *str = end;
715         return n;
716 }
717 
718 static int net_remove(int n, char **error_out)
719 {
720         struct uml_net *device;
721         struct net_device *dev;
722         struct uml_net_private *lp;
723 
724         device = find_device(n);
725         if (device == NULL)
726                 return -ENODEV;
727 
728         dev = device->dev;
729         lp = netdev_priv(dev);
730         if (lp->fd > 0)
731                 return -EBUSY;
732         unregister_netdev(dev);
733         platform_device_unregister(&device->pdev);
734 
735         return 0;
736 }
737 
738 static struct mc_device net_mc = {
739         .list           = LIST_HEAD_INIT(net_mc.list),
740         .name           = "eth",
741         .config         = net_config,
742         .get_config     = NULL,
743         .id             = net_id,
744         .remove         = net_remove,
745 };
746 
747 #ifdef CONFIG_INET
748 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
749                               void *ptr)
750 {
751         struct in_ifaddr *ifa = ptr;
752         struct net_device *dev = ifa->ifa_dev->dev;
753         struct uml_net_private *lp;
754         void (*proc)(unsigned char *, unsigned char *, void *);
755         unsigned char addr_buf[4], netmask_buf[4];
756 
757         if (dev->netdev_ops->ndo_open != uml_net_open)
758                 return NOTIFY_DONE;
759 
760         lp = netdev_priv(dev);
761 
762         proc = NULL;
763         switch (event) {
764         case NETDEV_UP:
765                 proc = lp->add_address;
766                 break;
767         case NETDEV_DOWN:
768                 proc = lp->delete_address;
769                 break;
770         }
771         if (proc != NULL) {
772                 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
773                 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
774                 (*proc)(addr_buf, netmask_buf, &lp->user);
775         }
776         return NOTIFY_DONE;
777 }
778 
779 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
780 static struct notifier_block uml_inetaddr_notifier = {
781         .notifier_call          = uml_inetaddr_event,
782 };
783 
784 static void inet_register(void)
785 {
786         struct list_head *ele;
787         struct uml_net_private *lp;
788         struct in_device *ip;
789         struct in_ifaddr *in;
790 
791         register_inetaddr_notifier(&uml_inetaddr_notifier);
792 
793         /* Devices may have been opened already, so the uml_inetaddr_notifier
794          * didn't get a chance to run for them.  This fakes it so that
795          * addresses which have already been set up get handled properly.
796          */
797         spin_lock(&opened_lock);
798         list_for_each(ele, &opened) {
799                 lp = list_entry(ele, struct uml_net_private, list);
800                 ip = lp->dev->ip_ptr;
801                 if (ip == NULL)
802                         continue;
803                 in = ip->ifa_list;
804                 while (in != NULL) {
805                         uml_inetaddr_event(NULL, NETDEV_UP, in);
806                         in = in->ifa_next;
807                 }
808         }
809         spin_unlock(&opened_lock);
810 }
811 #else
812 static inline void inet_register(void)
813 {
814 }
815 #endif
816 
817 static int uml_net_init(void)
818 {
819         mconsole_register_dev(&net_mc);
820         inet_register();
821         return 0;
822 }
823 
824 __initcall(uml_net_init);
825 
826 static void close_devices(void)
827 {
828         struct list_head *ele;
829         struct uml_net_private *lp;
830 
831         spin_lock(&opened_lock);
832         list_for_each(ele, &opened) {
833                 lp = list_entry(ele, struct uml_net_private, list);
834                 um_free_irq(lp->dev->irq, lp->dev);
835                 if ((lp->close != NULL) && (lp->fd >= 0))
836                         (*lp->close)(lp->fd, &lp->user);
837                 if (lp->remove != NULL)
838                         (*lp->remove)(&lp->user);
839         }
840         spin_unlock(&opened_lock);
841 }
842 
843 __uml_exitcall(close_devices);
844 
845 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
846                                         void *),
847                     void *arg)
848 {
849         struct net_device *dev = d;
850         struct in_device *ip = dev->ip_ptr;
851         struct in_ifaddr *in;
852         unsigned char address[4], netmask[4];
853 
854         if (ip == NULL) return;
855         in = ip->ifa_list;
856         while (in != NULL) {
857                 memcpy(address, &in->ifa_address, sizeof(address));
858                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
859                 (*cb)(address, netmask, arg);
860                 in = in->ifa_next;
861         }
862 }
863 
864 int dev_netmask(void *d, void *m)
865 {
866         struct net_device *dev = d;
867         struct in_device *ip = dev->ip_ptr;
868         struct in_ifaddr *in;
869         __be32 *mask_out = m;
870 
871         if (ip == NULL)
872                 return 1;
873 
874         in = ip->ifa_list;
875         if (in == NULL)
876                 return 1;
877 
878         *mask_out = in->ifa_mask;
879         return 0;
880 }
881 
882 void *get_output_buffer(int *len_out)
883 {
884         void *ret;
885 
886         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
887         if (ret) *len_out = PAGE_SIZE;
888         else *len_out = 0;
889         return ret;
890 }
891 
892 void free_output_buffer(void *buffer)
893 {
894         free_pages((unsigned long) buffer, 0);
895 }
896 
897 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
898                      char **gate_addr)
899 {
900         char *remain;
901 
902         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
903         if (remain != NULL) {
904                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
905                        "specification : '%s'\n", remain);
906                 return 1;
907         }
908 
909         return 0;
910 }
911 
912 unsigned short eth_protocol(struct sk_buff *skb)
913 {
914         return eth_type_trans(skb, skb->dev);
915 }
916 

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