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
update_drop_skb(int max)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
uml_net_rx(struct net_device * dev)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
uml_dev_close(struct work_struct * work)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
uml_net_interrupt(int irq,void * dev_id)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
uml_net_open(struct net_device * dev)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
uml_net_close(struct net_device * dev)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
uml_net_start_xmit(struct sk_buff * skb,struct net_device * dev)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
uml_net_set_multicast_list(struct net_device * dev)248 static void uml_net_set_multicast_list(struct net_device *dev)
249 {
250 return;
251 }
252
uml_net_tx_timeout(struct net_device * dev)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
uml_net_poll_controller(struct net_device * dev)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
uml_net_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)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
uml_net_user_timer_expire(unsigned long _conn)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
setup_etheraddr(struct net_device * dev,char * str)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
net_device_release(struct device * dev)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
eth_configure(int n,void * init,char * mac,struct transport * transport,gfp_t gfp_mask)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(¨_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 = ¨_netdev_ops;
472 dev->ethtool_ops = ¨_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
find_device(int n)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
eth_parse(char * str,int * index_out,char ** str_out,char ** error_out)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
check_transport(struct transport * transport,char * eth,int n,void ** init_out,char ** mac_out,gfp_t gfp_mask)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
register_transport(struct transport * new)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, ð_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(ð->list);
612 }
613 }
614
eth_setup_common(char * str,int index)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
eth_setup(char * str)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, ð_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
net_config(char * str,char ** error_out)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
net_id(char ** str,int * start_out,int * end_out)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
net_remove(int n,char ** error_out)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
uml_inetaddr_event(struct notifier_block * this,unsigned long event,void * ptr)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
inet_register(void)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(¨_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
inet_register(void)801 static inline void inet_register(void)
802 {
803 }
804 #endif
805
uml_net_init(void)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
close_devices(void)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
iter_addresses(void * d,void (* cb)(unsigned char *,unsigned char *,void *),void * arg)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
dev_netmask(void * d,void * m)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
get_output_buffer(int * len_out)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
free_output_buffer(void * buffer)881 void free_output_buffer(void *buffer)
882 {
883 free_pages((unsigned long) buffer, 0);
884 }
885
tap_setup_common(char * str,char * type,char ** dev_name,char ** mac_out,char ** gate_addr)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
eth_protocol(struct sk_buff * skb)901 unsigned short eth_protocol(struct sk_buff *skb)
902 {
903 return eth_type_trans(skb, skb->dev);
904 }
905