Merge tag 'asoc-fix-v5.17-rc5' of https://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / arch / um / drivers / net_kern.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
5  * James Leu (jleu@mindspring.net).
6  * Copyright (C) 2001 by various other people who didn't put their name here.
7  */
8
9 #include <linux/memblock.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 out:
141         spin_unlock(&lp->lock);
142         return IRQ_HANDLED;
143 }
144
145 static int uml_net_open(struct net_device *dev)
146 {
147         struct uml_net_private *lp = netdev_priv(dev);
148         int err;
149
150         if (lp->fd >= 0) {
151                 err = -ENXIO;
152                 goto out;
153         }
154
155         lp->fd = (*lp->open)(&lp->user);
156         if (lp->fd < 0) {
157                 err = lp->fd;
158                 goto out;
159         }
160
161         err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
162                              IRQF_SHARED, dev->name, dev);
163         if (err < 0) {
164                 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
165                 err = -ENETUNREACH;
166                 goto out_close;
167         }
168
169         netif_start_queue(dev);
170
171         /* clear buffer - it can happen that the host side of the interface
172          * is full when we get here.  In this case, new data is never queued,
173          * SIGIOs never arrive, and the net never works.
174          */
175         while ((err = uml_net_rx(dev)) > 0) ;
176
177         spin_lock(&opened_lock);
178         list_add(&lp->list, &opened);
179         spin_unlock(&opened_lock);
180
181         return 0;
182 out_close:
183         if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
184         lp->fd = -1;
185 out:
186         return err;
187 }
188
189 static int uml_net_close(struct net_device *dev)
190 {
191         struct uml_net_private *lp = netdev_priv(dev);
192
193         netif_stop_queue(dev);
194
195         um_free_irq(dev->irq, dev);
196         if (lp->close != NULL)
197                 (*lp->close)(lp->fd, &lp->user);
198         lp->fd = -1;
199
200         spin_lock(&opened_lock);
201         list_del(&lp->list);
202         spin_unlock(&opened_lock);
203
204         return 0;
205 }
206
207 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
208 {
209         struct uml_net_private *lp = netdev_priv(dev);
210         unsigned long flags;
211         int len;
212
213         netif_stop_queue(dev);
214
215         spin_lock_irqsave(&lp->lock, flags);
216
217         len = (*lp->write)(lp->fd, skb, lp);
218         skb_tx_timestamp(skb);
219
220         if (len == skb->len) {
221                 dev->stats.tx_packets++;
222                 dev->stats.tx_bytes += skb->len;
223                 netif_trans_update(dev);
224                 netif_start_queue(dev);
225
226                 /* this is normally done in the interrupt when tx finishes */
227                 netif_wake_queue(dev);
228         }
229         else if (len == 0) {
230                 netif_start_queue(dev);
231                 dev->stats.tx_dropped++;
232         }
233         else {
234                 netif_start_queue(dev);
235                 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
236         }
237
238         spin_unlock_irqrestore(&lp->lock, flags);
239
240         dev_consume_skb_any(skb);
241
242         return NETDEV_TX_OK;
243 }
244
245 static void uml_net_set_multicast_list(struct net_device *dev)
246 {
247         return;
248 }
249
250 static void uml_net_tx_timeout(struct net_device *dev, unsigned int txqueue)
251 {
252         netif_trans_update(dev);
253         netif_wake_queue(dev);
254 }
255
256 #ifdef CONFIG_NET_POLL_CONTROLLER
257 static void uml_net_poll_controller(struct net_device *dev)
258 {
259         disable_irq(dev->irq);
260         uml_net_interrupt(dev->irq, dev);
261         enable_irq(dev->irq);
262 }
263 #endif
264
265 static void uml_net_get_drvinfo(struct net_device *dev,
266                                 struct ethtool_drvinfo *info)
267 {
268         strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
269 }
270
271 static const struct ethtool_ops uml_net_ethtool_ops = {
272         .get_drvinfo    = uml_net_get_drvinfo,
273         .get_link       = ethtool_op_get_link,
274         .get_ts_info    = ethtool_op_get_ts_info,
275 };
276
277 void uml_net_setup_etheraddr(struct net_device *dev, char *str)
278 {
279         u8 addr[ETH_ALEN];
280         char *end;
281         int i;
282
283         if (str == NULL)
284                 goto random;
285
286         for (i = 0; i < 6; i++) {
287                 addr[i] = simple_strtoul(str, &end, 16);
288                 if ((end == str) ||
289                    ((*end != ':') && (*end != ',') && (*end != '\0'))) {
290                         printk(KERN_ERR
291                                "setup_etheraddr: failed to parse '%s' "
292                                "as an ethernet address\n", str);
293                         goto random;
294                 }
295                 str = end + 1;
296         }
297         if (is_multicast_ether_addr(addr)) {
298                 printk(KERN_ERR
299                        "Attempt to assign a multicast ethernet address to a "
300                        "device disallowed\n");
301                 goto random;
302         }
303         if (!is_valid_ether_addr(addr)) {
304                 printk(KERN_ERR
305                        "Attempt to assign an invalid ethernet address to a "
306                        "device disallowed\n");
307                 goto random;
308         }
309         if (!is_local_ether_addr(addr)) {
310                 printk(KERN_WARNING
311                        "Warning: Assigning a globally valid ethernet "
312                        "address to a device\n");
313                 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
314                        "the first byte of the MAC,\n");
315                 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
316                        addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
317                        addr[5]);
318         }
319         eth_hw_addr_set(dev, addr);
320         return;
321
322 random:
323         printk(KERN_INFO
324                "Choosing a random ethernet address for device %s\n", dev->name);
325         eth_hw_addr_random(dev);
326 }
327
328 static DEFINE_SPINLOCK(devices_lock);
329 static LIST_HEAD(devices);
330
331 static struct platform_driver uml_net_driver = {
332         .driver = {
333                 .name  = DRIVER_NAME,
334         },
335 };
336
337 static void net_device_release(struct device *dev)
338 {
339         struct uml_net *device = dev_get_drvdata(dev);
340         struct net_device *netdev = device->dev;
341         struct uml_net_private *lp = netdev_priv(netdev);
342
343         if (lp->remove != NULL)
344                 (*lp->remove)(&lp->user);
345         list_del(&device->list);
346         kfree(device);
347         free_netdev(netdev);
348 }
349
350 static const struct net_device_ops uml_netdev_ops = {
351         .ndo_open               = uml_net_open,
352         .ndo_stop               = uml_net_close,
353         .ndo_start_xmit         = uml_net_start_xmit,
354         .ndo_set_rx_mode        = uml_net_set_multicast_list,
355         .ndo_tx_timeout         = uml_net_tx_timeout,
356         .ndo_set_mac_address    = eth_mac_addr,
357         .ndo_validate_addr      = eth_validate_addr,
358 #ifdef CONFIG_NET_POLL_CONTROLLER
359         .ndo_poll_controller = uml_net_poll_controller,
360 #endif
361 };
362
363 /*
364  * Ensures that platform_driver_register is called only once by
365  * eth_configure.  Will be set in an initcall.
366  */
367 static int driver_registered;
368
369 static void eth_configure(int n, void *init, char *mac,
370                           struct transport *transport, gfp_t gfp_mask)
371 {
372         struct uml_net *device;
373         struct net_device *dev;
374         struct uml_net_private *lp;
375         int err, size;
376
377         size = transport->private_size + sizeof(struct uml_net_private);
378
379         device = kzalloc(sizeof(*device), gfp_mask);
380         if (device == NULL) {
381                 printk(KERN_ERR "eth_configure failed to allocate struct "
382                        "uml_net\n");
383                 return;
384         }
385
386         dev = alloc_etherdev(size);
387         if (dev == NULL) {
388                 printk(KERN_ERR "eth_configure: failed to allocate struct "
389                        "net_device for eth%d\n", n);
390                 goto out_free_device;
391         }
392
393         INIT_LIST_HEAD(&device->list);
394         device->index = n;
395
396         /* If this name ends up conflicting with an existing registered
397          * netdevice, that is OK, register_netdev{,ice}() will notice this
398          * and fail.
399          */
400         snprintf(dev->name, sizeof(dev->name), "eth%d", n);
401
402         uml_net_setup_etheraddr(dev, mac);
403
404         printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
405
406         lp = netdev_priv(dev);
407         /* This points to the transport private data. It's still clear, but we
408          * must memset it to 0 *now*. Let's help the drivers. */
409         memset(lp, 0, size);
410         INIT_WORK(&lp->work, uml_dev_close);
411
412         /* sysfs register */
413         if (!driver_registered) {
414                 platform_driver_register(&uml_net_driver);
415                 driver_registered = 1;
416         }
417         device->pdev.id = n;
418         device->pdev.name = DRIVER_NAME;
419         device->pdev.dev.release = net_device_release;
420         dev_set_drvdata(&device->pdev.dev, device);
421         if (platform_device_register(&device->pdev))
422                 goto out_free_netdev;
423         SET_NETDEV_DEV(dev,&device->pdev.dev);
424
425         device->dev = dev;
426
427         /*
428          * These just fill in a data structure, so there's no failure
429          * to be worried about.
430          */
431         (*transport->kern->init)(dev, init);
432
433         *lp = ((struct uml_net_private)
434                 { .list                 = LIST_HEAD_INIT(lp->list),
435                   .dev                  = dev,
436                   .fd                   = -1,
437                   .mac                  = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
438                   .max_packet           = transport->user->max_packet,
439                   .protocol             = transport->kern->protocol,
440                   .open                 = transport->user->open,
441                   .close                = transport->user->close,
442                   .remove               = transport->user->remove,
443                   .read                 = transport->kern->read,
444                   .write                = transport->kern->write,
445                   .add_address          = transport->user->add_address,
446                   .delete_address       = transport->user->delete_address });
447
448         spin_lock_init(&lp->lock);
449         memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
450
451         if ((transport->user->init != NULL) &&
452             ((*transport->user->init)(&lp->user, dev) != 0))
453                 goto out_unregister;
454
455         dev->mtu = transport->user->mtu;
456         dev->netdev_ops = &uml_netdev_ops;
457         dev->ethtool_ops = &uml_net_ethtool_ops;
458         dev->watchdog_timeo = (HZ >> 1);
459         dev->irq = UM_ETH_IRQ;
460
461         err = update_drop_skb(lp->max_packet);
462         if (err)
463                 goto out_undo_user_init;
464
465         rtnl_lock();
466         err = register_netdevice(dev);
467         rtnl_unlock();
468         if (err)
469                 goto out_undo_user_init;
470
471         spin_lock(&devices_lock);
472         list_add(&device->list, &devices);
473         spin_unlock(&devices_lock);
474
475         return;
476
477 out_undo_user_init:
478         if (transport->user->remove != NULL)
479                 (*transport->user->remove)(&lp->user);
480 out_unregister:
481         platform_device_unregister(&device->pdev);
482         return; /* platform_device_unregister frees dev and device */
483 out_free_netdev:
484         free_netdev(dev);
485 out_free_device:
486         kfree(device);
487 }
488
489 static struct uml_net *find_device(int n)
490 {
491         struct uml_net *device;
492         struct list_head *ele;
493
494         spin_lock(&devices_lock);
495         list_for_each(ele, &devices) {
496                 device = list_entry(ele, struct uml_net, list);
497                 if (device->index == n)
498                         goto out;
499         }
500         device = NULL;
501  out:
502         spin_unlock(&devices_lock);
503         return device;
504 }
505
506 static int eth_parse(char *str, int *index_out, char **str_out,
507                      char **error_out)
508 {
509         char *end;
510         int n, err = -EINVAL;
511
512         n = simple_strtoul(str, &end, 0);
513         if (end == str) {
514                 *error_out = "Bad device number";
515                 return err;
516         }
517
518         str = end;
519         if (*str != '=') {
520                 *error_out = "Expected '=' after device number";
521                 return err;
522         }
523
524         str++;
525         if (find_device(n)) {
526                 *error_out = "Device already configured";
527                 return err;
528         }
529
530         *index_out = n;
531         *str_out = str;
532         return 0;
533 }
534
535 struct eth_init {
536         struct list_head list;
537         char *init;
538         int index;
539 };
540
541 static DEFINE_SPINLOCK(transports_lock);
542 static LIST_HEAD(transports);
543
544 /* Filled in during early boot */
545 static LIST_HEAD(eth_cmd_line);
546
547 static int check_transport(struct transport *transport, char *eth, int n,
548                            void **init_out, char **mac_out, gfp_t gfp_mask)
549 {
550         int len;
551
552         len = strlen(transport->name);
553         if (strncmp(eth, transport->name, len))
554                 return 0;
555
556         eth += len;
557         if (*eth == ',')
558                 eth++;
559         else if (*eth != '\0')
560                 return 0;
561
562         *init_out = kmalloc(transport->setup_size, gfp_mask);
563         if (*init_out == NULL)
564                 return 1;
565
566         if (!transport->setup(eth, mac_out, *init_out)) {
567                 kfree(*init_out);
568                 *init_out = NULL;
569         }
570         return 1;
571 }
572
573 void register_transport(struct transport *new)
574 {
575         struct list_head *ele, *next;
576         struct eth_init *eth;
577         void *init;
578         char *mac = NULL;
579         int match;
580
581         spin_lock(&transports_lock);
582         BUG_ON(!list_empty(&new->list));
583         list_add(&new->list, &transports);
584         spin_unlock(&transports_lock);
585
586         list_for_each_safe(ele, next, &eth_cmd_line) {
587                 eth = list_entry(ele, struct eth_init, list);
588                 match = check_transport(new, eth->init, eth->index, &init,
589                                         &mac, GFP_KERNEL);
590                 if (!match)
591                         continue;
592                 else if (init != NULL) {
593                         eth_configure(eth->index, init, mac, new, GFP_KERNEL);
594                         kfree(init);
595                 }
596                 list_del(&eth->list);
597         }
598 }
599
600 static int eth_setup_common(char *str, int index)
601 {
602         struct list_head *ele;
603         struct transport *transport;
604         void *init;
605         char *mac = NULL;
606         int found = 0;
607
608         spin_lock(&transports_lock);
609         list_for_each(ele, &transports) {
610                 transport = list_entry(ele, struct transport, list);
611                 if (!check_transport(transport, str, index, &init,
612                                         &mac, GFP_ATOMIC))
613                         continue;
614                 if (init != NULL) {
615                         eth_configure(index, init, mac, transport, GFP_ATOMIC);
616                         kfree(init);
617                 }
618                 found = 1;
619                 break;
620         }
621
622         spin_unlock(&transports_lock);
623         return found;
624 }
625
626 static int __init 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 = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
640         if (!new)
641                 panic("%s: Failed to allocate %zu bytes\n", __func__,
642                       sizeof(*new));
643
644         INIT_LIST_HEAD(&new->list);
645         new->index = n;
646         new->init = str;
647
648         list_add_tail(&new->list, &eth_cmd_line);
649         return 1;
650 }
651
652 __setup("eth", eth_setup);
653 __uml_help(eth_setup,
654 "eth[0-9]+=<transport>,<options>\n"
655 "    Configure a network device.\n\n"
656 );
657
658 static int net_config(char *str, char **error_out)
659 {
660         int n, err;
661
662         err = eth_parse(str, &n, &str, error_out);
663         if (err)
664                 return err;
665
666         /* This string is broken up and the pieces used by the underlying
667          * driver.  So, it is freed only if eth_setup_common fails.
668          */
669         str = kstrdup(str, GFP_KERNEL);
670         if (str == NULL) {
671                 *error_out = "net_config failed to strdup string";
672                 return -ENOMEM;
673         }
674         err = !eth_setup_common(str, n);
675         if (err)
676                 kfree(str);
677         return err;
678 }
679
680 static int net_id(char **str, int *start_out, int *end_out)
681 {
682         char *end;
683         int n;
684
685         n = simple_strtoul(*str, &end, 0);
686         if ((*end != '\0') || (end == *str))
687                 return -1;
688
689         *start_out = n;
690         *end_out = n;
691         *str = end;
692         return n;
693 }
694
695 static int net_remove(int n, char **error_out)
696 {
697         struct uml_net *device;
698         struct net_device *dev;
699         struct uml_net_private *lp;
700
701         device = find_device(n);
702         if (device == NULL)
703                 return -ENODEV;
704
705         dev = device->dev;
706         lp = netdev_priv(dev);
707         if (lp->fd > 0)
708                 return -EBUSY;
709         unregister_netdev(dev);
710         platform_device_unregister(&device->pdev);
711
712         return 0;
713 }
714
715 static struct mc_device net_mc = {
716         .list           = LIST_HEAD_INIT(net_mc.list),
717         .name           = "eth",
718         .config         = net_config,
719         .get_config     = NULL,
720         .id             = net_id,
721         .remove         = net_remove,
722 };
723
724 #ifdef CONFIG_INET
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->netdev_ops->ndo_open != uml_net_open)
735                 return NOTIFY_DONE;
736
737         lp = netdev_priv(dev);
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 static struct notifier_block uml_inetaddr_notifier = {
758         .notifier_call          = uml_inetaddr_event,
759 };
760
761 static void inet_register(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         register_inetaddr_notifier(&uml_inetaddr_notifier);
769
770         /* Devices may have been opened already, so the uml_inetaddr_notifier
771          * didn't get a chance to run for them.  This fakes it so that
772          * addresses which have already been set up get handled properly.
773          */
774         spin_lock(&opened_lock);
775         list_for_each(ele, &opened) {
776                 lp = list_entry(ele, struct uml_net_private, list);
777                 ip = lp->dev->ip_ptr;
778                 if (ip == NULL)
779                         continue;
780                 in = ip->ifa_list;
781                 while (in != NULL) {
782                         uml_inetaddr_event(NULL, NETDEV_UP, in);
783                         in = in->ifa_next;
784                 }
785         }
786         spin_unlock(&opened_lock);
787 }
788 #else
789 static inline void inet_register(void)
790 {
791 }
792 #endif
793
794 static int uml_net_init(void)
795 {
796         mconsole_register_dev(&net_mc);
797         inet_register();
798         return 0;
799 }
800
801 __initcall(uml_net_init);
802
803 static void close_devices(void)
804 {
805         struct list_head *ele;
806         struct uml_net_private *lp;
807
808         spin_lock(&opened_lock);
809         list_for_each(ele, &opened) {
810                 lp = list_entry(ele, struct uml_net_private, list);
811                 um_free_irq(lp->dev->irq, lp->dev);
812                 if ((lp->close != NULL) && (lp->fd >= 0))
813                         (*lp->close)(lp->fd, &lp->user);
814                 if (lp->remove != NULL)
815                         (*lp->remove)(&lp->user);
816         }
817         spin_unlock(&opened_lock);
818 }
819
820 __uml_exitcall(close_devices);
821
822 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
823                                         void *),
824                     void *arg)
825 {
826         struct net_device *dev = d;
827         struct in_device *ip = dev->ip_ptr;
828         struct in_ifaddr *in;
829         unsigned char address[4], netmask[4];
830
831         if (ip == NULL) return;
832         in = ip->ifa_list;
833         while (in != NULL) {
834                 memcpy(address, &in->ifa_address, sizeof(address));
835                 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
836                 (*cb)(address, netmask, arg);
837                 in = in->ifa_next;
838         }
839 }
840
841 int dev_netmask(void *d, void *m)
842 {
843         struct net_device *dev = d;
844         struct in_device *ip = dev->ip_ptr;
845         struct in_ifaddr *in;
846         __be32 *mask_out = m;
847
848         if (ip == NULL)
849                 return 1;
850
851         in = ip->ifa_list;
852         if (in == NULL)
853                 return 1;
854
855         *mask_out = in->ifa_mask;
856         return 0;
857 }
858
859 void *get_output_buffer(int *len_out)
860 {
861         void *ret;
862
863         ret = (void *) __get_free_pages(GFP_KERNEL, 0);
864         if (ret) *len_out = PAGE_SIZE;
865         else *len_out = 0;
866         return ret;
867 }
868
869 void free_output_buffer(void *buffer)
870 {
871         free_pages((unsigned long) buffer, 0);
872 }
873
874 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
875                      char **gate_addr)
876 {
877         char *remain;
878
879         remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
880         if (remain != NULL) {
881                 printk(KERN_ERR "tap_setup_common - Extra garbage on "
882                        "specification : '%s'\n", remain);
883                 return 1;
884         }
885
886         return 0;
887 }
888
889 unsigned short eth_protocol(struct sk_buff *skb)
890 {
891         return eth_type_trans(skb, skb->dev);
892 }