Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / arch / um / drivers / net_kern.c
blob7d26d9c0b2fb85cd96ca25953f2bb84d4022be9d
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 */
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>
28 #define DRIVER_NAME "uml-netdev"
30 static DEFINE_SPINLOCK(opened_lock);
31 static LIST_HEAD(opened);
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.
41 static DEFINE_SPINLOCK(drop_lock);
42 static struct sk_buff *drop_skb;
43 static int drop_max;
45 static int update_drop_skb(int max)
47 struct sk_buff *new;
48 unsigned long flags;
49 int err = 0;
51 spin_lock_irqsave(&drop_lock, flags);
53 if (max <= drop_max)
54 goto out;
56 err = -ENOMEM;
57 new = dev_alloc_skb(max);
58 if (new == NULL)
59 goto out;
61 skb_put(new, max);
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);
70 return err;
73 static int uml_net_rx(struct net_device *dev)
75 struct uml_net_private *lp = netdev_priv(dev);
76 int pkt_len;
77 struct sk_buff *skb;
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;
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);
94 if (pkt_len > 0) {
95 skb_trim(skb, pkt_len);
96 skb->protocol = (*lp->protocol)(skb);
98 dev->stats.rx_bytes += skb->len;
99 dev->stats.rx_packets++;
100 netif_rx(skb);
101 return pkt_len;
104 kfree_skb(skb);
105 return pkt_len;
108 static void uml_dev_close(struct work_struct *work)
110 struct uml_net_private *lp =
111 container_of(work, struct uml_net_private, work);
112 dev_close(lp->dev);
115 static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
117 struct net_device *dev = dev_id;
118 struct uml_net_private *lp = netdev_priv(dev);
119 int err;
121 if (!netif_running(dev))
122 return IRQ_NONE;
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;
140 reactivate_fd(lp->fd, UM_ETH_IRQ);
142 out:
143 spin_unlock(&lp->lock);
144 return IRQ_HANDLED;
147 static int uml_net_open(struct net_device *dev)
149 struct uml_net_private *lp = netdev_priv(dev);
150 int err;
152 if (lp->fd >= 0) {
153 err = -ENXIO;
154 goto out;
157 lp->fd = (*lp->open)(&lp->user);
158 if (lp->fd < 0) {
159 err = lp->fd;
160 goto out;
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;
171 lp->tl.data = (unsigned long) &lp->user;
172 netif_start_queue(dev);
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.
178 while ((err = uml_net_rx(dev)) > 0) ;
180 spin_lock(&opened_lock);
181 list_add(&lp->list, &opened);
182 spin_unlock(&opened_lock);
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;
192 static int uml_net_close(struct net_device *dev)
194 struct uml_net_private *lp = netdev_priv(dev);
196 netif_stop_queue(dev);
198 um_free_irq(dev->irq, dev);
199 if (lp->close != NULL)
200 (*lp->close)(lp->fd, &lp->user);
201 lp->fd = -1;
203 spin_lock(&opened_lock);
204 list_del(&lp->list);
205 spin_unlock(&opened_lock);
207 return 0;
210 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
212 struct uml_net_private *lp = netdev_priv(dev);
213 unsigned long flags;
214 int len;
216 netif_stop_queue(dev);
218 spin_lock_irqsave(&lp->lock, flags);
220 len = (*lp->write)(lp->fd, skb, lp);
221 skb_tx_timestamp(skb);
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);
229 /* this is normally done in the interrupt when tx finishes */
230 netif_wake_queue(dev);
232 else if (len == 0) {
233 netif_start_queue(dev);
234 dev->stats.tx_dropped++;
236 else {
237 netif_start_queue(dev);
238 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
241 spin_unlock_irqrestore(&lp->lock, flags);
243 dev_consume_skb_any(skb);
245 return NETDEV_TX_OK;
248 static void uml_net_set_multicast_list(struct net_device *dev)
250 return;
253 static void uml_net_tx_timeout(struct net_device *dev)
255 dev->trans_start = jiffies;
256 netif_wake_queue(dev);
259 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
261 dev->mtu = new_mtu;
263 return 0;
266 #ifdef CONFIG_NET_POLL_CONTROLLER
267 static void uml_net_poll_controller(struct net_device *dev)
269 disable_irq(dev->irq);
270 uml_net_interrupt(dev->irq, dev);
271 enable_irq(dev->irq);
273 #endif
275 static void uml_net_get_drvinfo(struct net_device *dev,
276 struct ethtool_drvinfo *info)
278 strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
279 strlcpy(info->version, "42", sizeof(info->version));
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,
288 static void uml_net_user_timer_expire(unsigned long _conn)
290 #ifdef undef
291 struct connection *conn = (struct connection *)_conn;
293 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
294 do_connect(conn);
295 #endif
298 static void setup_etheraddr(struct net_device *dev, char *str)
300 unsigned char *addr = dev->dev_addr;
301 char *end;
302 int i;
304 if (str == NULL)
305 goto random;
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;
316 str = end + 1;
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;
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;
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]);
340 return;
342 random:
343 printk(KERN_INFO
344 "Choosing a random ethernet address for device %s\n", dev->name);
345 eth_hw_addr_random(dev);
348 static DEFINE_SPINLOCK(devices_lock);
349 static LIST_HEAD(devices);
351 static struct platform_driver uml_net_driver = {
352 .driver = {
353 .name = DRIVER_NAME,
357 static void net_device_release(struct device *dev)
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);
363 if (lp->remove != NULL)
364 (*lp->remove)(&lp->user);
365 list_del(&device->list);
366 kfree(device);
367 free_netdev(netdev);
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
385 * Ensures that platform_driver_register is called only once by
386 * eth_configure. Will be set in an initcall.
388 static int driver_registered;
390 static void eth_configure(int n, void *init, char *mac,
391 struct transport *transport)
393 struct uml_net *device;
394 struct net_device *dev;
395 struct uml_net_private *lp;
396 int err, size;
398 size = transport->private_size + sizeof(struct uml_net_private);
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;
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;
414 INIT_LIST_HEAD(&device->list);
415 device->index = n;
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.
421 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
423 setup_etheraddr(dev, mac);
425 printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
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);
433 /* sysfs register */
434 if (!driver_registered) {
435 platform_driver_register(&uml_net_driver);
436 driver_registered = 1;
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);
446 device->dev = dev;
449 * These just fill in a data structure, so there's no failure
450 * to be worried about.
452 (*transport->kern->init)(dev, init);
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 });
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));
474 if ((transport->user->init != NULL) &&
475 ((*transport->user->init)(&lp->user, dev) != 0))
476 goto out_unregister;
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;
484 err = update_drop_skb(lp->max_packet);
485 if (err)
486 goto out_undo_user_init;
488 rtnl_lock();
489 err = register_netdevice(dev);
490 rtnl_unlock();
491 if (err)
492 goto out_undo_user_init;
494 spin_lock(&devices_lock);
495 list_add(&device->list, &devices);
496 spin_unlock(&devices_lock);
498 return;
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);
512 static struct uml_net *find_device(int n)
514 struct uml_net *device;
515 struct list_head *ele;
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;
523 device = NULL;
524 out:
525 spin_unlock(&devices_lock);
526 return device;
529 static int eth_parse(char *str, int *index_out, char **str_out,
530 char **error_out)
532 char *end;
533 int n, err = -EINVAL;
535 n = simple_strtoul(str, &end, 0);
536 if (end == str) {
537 *error_out = "Bad device number";
538 return err;
541 str = end;
542 if (*str != '=') {
543 *error_out = "Expected '=' after device number";
544 return err;
547 str++;
548 if (find_device(n)) {
549 *error_out = "Device already configured";
550 return err;
553 *index_out = n;
554 *str_out = str;
555 return 0;
558 struct eth_init {
559 struct list_head list;
560 char *init;
561 int index;
564 static DEFINE_SPINLOCK(transports_lock);
565 static LIST_HEAD(transports);
567 /* Filled in during early boot */
568 static LIST_HEAD(eth_cmd_line);
570 static int check_transport(struct transport *transport, char *eth, int n,
571 void **init_out, char **mac_out)
573 int len;
575 len = strlen(transport->name);
576 if (strncmp(eth, transport->name, len))
577 return 0;
579 eth += len;
580 if (*eth == ',')
581 eth++;
582 else if (*eth != '\0')
583 return 0;
585 *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
586 if (*init_out == NULL)
587 return 1;
589 if (!transport->setup(eth, mac_out, *init_out)) {
590 kfree(*init_out);
591 *init_out = NULL;
593 return 1;
596 void register_transport(struct transport *new)
598 struct list_head *ele, *next;
599 struct eth_init *eth;
600 void *init;
601 char *mac = NULL;
602 int match;
604 spin_lock(&transports_lock);
605 BUG_ON(!list_empty(&new->list));
606 list_add(&new->list, &transports);
607 spin_unlock(&transports_lock);
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);
619 list_del(&eth->list);
623 static int eth_setup_common(char *str, int index)
625 struct list_head *ele;
626 struct transport *transport;
627 void *init;
628 char *mac = NULL;
629 int found = 0;
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);
640 found = 1;
641 break;
644 spin_unlock(&transports_lock);
645 return found;
648 static int __init eth_setup(char *str)
650 struct eth_init *new;
651 char *error;
652 int n, err;
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;
661 new = alloc_bootmem(sizeof(*new));
662 if (new == NULL) {
663 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
664 return 1;
667 INIT_LIST_HEAD(&new->list);
668 new->index = n;
669 new->init = str;
671 list_add_tail(&new->list, &eth_cmd_line);
672 return 1;
675 __setup("eth", eth_setup);
676 __uml_help(eth_setup,
677 "eth[0-9]+=<transport>,<options>\n"
678 " Configure a network device.\n\n"
681 static int net_config(char *str, char **error_out)
683 int n, err;
685 err = eth_parse(str, &n, &str, error_out);
686 if (err)
687 return err;
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.
692 str = kstrdup(str, GFP_KERNEL);
693 if (str == NULL) {
694 *error_out = "net_config failed to strdup string";
695 return -ENOMEM;
697 err = !eth_setup_common(str, n);
698 if (err)
699 kfree(str);
700 return err;
703 static int net_id(char **str, int *start_out, int *end_out)
705 char *end;
706 int n;
708 n = simple_strtoul(*str, &end, 0);
709 if ((*end != '\0') || (end == *str))
710 return -1;
712 *start_out = n;
713 *end_out = n;
714 *str = end;
715 return n;
718 static int net_remove(int n, char **error_out)
720 struct uml_net *device;
721 struct net_device *dev;
722 struct uml_net_private *lp;
724 device = find_device(n);
725 if (device == NULL)
726 return -ENODEV;
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);
735 return 0;
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,
747 #ifdef CONFIG_INET
748 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
749 void *ptr)
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];
757 if (dev->netdev_ops->ndo_open != uml_net_open)
758 return NOTIFY_DONE;
760 lp = netdev_priv(dev);
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;
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);
776 return NOTIFY_DONE;
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,
784 static void inet_register(void)
786 struct list_head *ele;
787 struct uml_net_private *lp;
788 struct in_device *ip;
789 struct in_ifaddr *in;
791 register_inetaddr_notifier(&uml_inetaddr_notifier);
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.
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;
809 spin_unlock(&opened_lock);
811 #else
812 static inline void inet_register(void)
815 #endif
817 static int uml_net_init(void)
819 mconsole_register_dev(&net_mc);
820 inet_register();
821 return 0;
824 __initcall(uml_net_init);
826 static void close_devices(void)
828 struct list_head *ele;
829 struct uml_net_private *lp;
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);
840 spin_unlock(&opened_lock);
843 __uml_exitcall(close_devices);
845 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
846 void *),
847 void *arg)
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];
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;
864 int dev_netmask(void *d, void *m)
866 struct net_device *dev = d;
867 struct in_device *ip = dev->ip_ptr;
868 struct in_ifaddr *in;
869 __be32 *mask_out = m;
871 if (ip == NULL)
872 return 1;
874 in = ip->ifa_list;
875 if (in == NULL)
876 return 1;
878 *mask_out = in->ifa_mask;
879 return 0;
882 void *get_output_buffer(int *len_out)
884 void *ret;
886 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
887 if (ret) *len_out = PAGE_SIZE;
888 else *len_out = 0;
889 return ret;
892 void free_output_buffer(void *buffer)
894 free_pages((unsigned long) buffer, 0);
897 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
898 char **gate_addr)
900 char *remain;
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;
909 return 0;
912 unsigned short eth_protocol(struct sk_buff *skb)
914 return eth_type_trans(skb, skb->dev);