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.
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/spinlock.h>
23 #include "mconsole_kern.h"
27 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
29 memcpy(dev->dev_addr, addr, ETH_ALEN);
32 #define DRIVER_NAME "uml-netdev"
34 static DEFINE_SPINLOCK(opened_lock);
35 static LIST_HEAD(opened);
37 static int uml_net_rx(struct net_device *dev)
39 struct uml_net_private *lp = dev->priv;
43 /* If we can't allocate memory, try again next round. */
44 skb = dev_alloc_skb(lp->max_packet);
46 lp->stats.rx_dropped++;
51 skb_put(skb, lp->max_packet);
52 skb_reset_mac_header(skb);
53 pkt_len = (*lp->read)(lp->fd, skb, lp);
56 skb_trim(skb, pkt_len);
57 skb->protocol = (*lp->protocol)(skb);
60 lp->stats.rx_bytes += skb->len;
61 lp->stats.rx_packets++;
69 static void uml_dev_close(struct work_struct *work)
71 struct uml_net_private *lp =
72 container_of(work, struct uml_net_private, work);
76 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
78 struct net_device *dev = dev_id;
79 struct uml_net_private *lp = dev->priv;
82 if (!netif_running(dev))
86 while ((err = uml_net_rx(dev)) > 0) ;
89 "Device '%s' read returned %d, shutting it down\n",
91 /* dev_close can't be called in interrupt context, and takes
93 * And dev_close() can be safely called multiple times on the
94 * same device, since it tests for (dev->flags & IFF_UP). So
95 * there's no harm in delaying the device shutdown.
96 * Furthermore, the workqueue will not re-enqueue an already
97 * enqueued work item. */
98 schedule_work(&lp->work);
101 reactivate_fd(lp->fd, UM_ETH_IRQ);
104 spin_unlock(&lp->lock);
108 static int uml_net_open(struct net_device *dev)
110 struct uml_net_private *lp = dev->priv;
118 lp->fd = (*lp->open)(&lp->user);
124 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
125 IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
127 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
132 lp->tl.data = (unsigned long) &lp->user;
133 netif_start_queue(dev);
135 /* clear buffer - it can happen that the host side of the interface
136 * is full when we get here. In this case, new data is never queued,
137 * SIGIOs never arrive, and the net never works.
139 while ((err = uml_net_rx(dev)) > 0) ;
141 spin_lock(&opened_lock);
142 list_add(&lp->list, &opened);
143 spin_unlock(&opened_lock);
147 if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
153 static int uml_net_close(struct net_device *dev)
155 struct uml_net_private *lp = dev->priv;
157 netif_stop_queue(dev);
159 free_irq(dev->irq, dev);
160 if (lp->close != NULL)
161 (*lp->close)(lp->fd, &lp->user);
164 spin_lock(&opened_lock);
166 spin_unlock(&opened_lock);
171 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
173 struct uml_net_private *lp = dev->priv;
177 netif_stop_queue(dev);
179 spin_lock_irqsave(&lp->lock, flags);
181 len = (*lp->write)(lp->fd, skb, lp);
183 if (len == skb->len) {
184 lp->stats.tx_packets++;
185 lp->stats.tx_bytes += skb->len;
186 dev->trans_start = jiffies;
187 netif_start_queue(dev);
189 /* this is normally done in the interrupt when tx finishes */
190 netif_wake_queue(dev);
193 netif_start_queue(dev);
194 lp->stats.tx_dropped++;
197 netif_start_queue(dev);
198 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
201 spin_unlock_irqrestore(&lp->lock, flags);
208 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
210 struct uml_net_private *lp = dev->priv;
214 static void uml_net_set_multicast_list(struct net_device *dev)
216 if (dev->flags & IFF_PROMISC)
218 else if (dev->mc_count)
219 dev->flags |= IFF_ALLMULTI;
220 else dev->flags &= ~IFF_ALLMULTI;
223 static void uml_net_tx_timeout(struct net_device *dev)
225 dev->trans_start = jiffies;
226 netif_wake_queue(dev);
229 static int uml_net_set_mac(struct net_device *dev, void *addr)
231 struct uml_net_private *lp = dev->priv;
232 struct sockaddr *hwaddr = addr;
234 spin_lock_irq(&lp->lock);
235 set_ether_mac(dev, hwaddr->sa_data);
236 spin_unlock_irq(&lp->lock);
241 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
248 static void uml_net_get_drvinfo(struct net_device *dev,
249 struct ethtool_drvinfo *info)
251 strcpy(info->driver, DRIVER_NAME);
252 strcpy(info->version, "42");
255 static struct ethtool_ops uml_net_ethtool_ops = {
256 .get_drvinfo = uml_net_get_drvinfo,
257 .get_link = ethtool_op_get_link,
260 void uml_net_user_timer_expire(unsigned long _conn)
263 struct connection *conn = (struct connection *)_conn;
265 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
270 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
278 for (i = 0;i < 6; i++) {
279 addr[i] = simple_strtoul(str, &end, 16);
281 ((*end != ':') && (*end != ',') && (*end != '\0'))) {
283 "setup_etheraddr: failed to parse '%s' "
284 "as an ethernet address\n", str);
289 if (is_multicast_ether_addr(addr)) {
291 "Attempt to assign a multicast ethernet address to a "
292 "device disallowed\n");
295 if (!is_valid_ether_addr(addr)) {
297 "Attempt to assign an invalid ethernet address to a "
298 "device disallowed\n");
301 if (!is_local_ether_addr(addr)) {
303 "Warning: attempt to assign a globally valid ethernet "
304 "address to a device\n");
305 printk(KERN_WARNING "You should better enable the 2nd "
306 "rightmost bit in the first byte of the MAC,\n");
307 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
308 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
316 "Choosing a random ethernet address for device %s\n", name);
317 random_ether_addr(addr);
320 static DEFINE_SPINLOCK(devices_lock);
321 static LIST_HEAD(devices);
323 static struct platform_driver uml_net_driver = {
328 static int driver_registered;
330 static void net_device_release(struct device *dev)
332 struct uml_net *device = dev->driver_data;
333 struct net_device *netdev = device->dev;
334 struct uml_net_private *lp = netdev->priv;
336 if (lp->remove != NULL)
337 (*lp->remove)(&lp->user);
338 list_del(&device->list);
343 static void eth_configure(int n, void *init, char *mac,
344 struct transport *transport)
346 struct uml_net *device;
347 struct net_device *dev;
348 struct uml_net_private *lp;
351 size = transport->private_size + sizeof(struct uml_net_private);
353 device = kzalloc(sizeof(*device), GFP_KERNEL);
354 if (device == NULL) {
355 printk(KERN_ERR "eth_configure failed to allocate struct "
360 dev = alloc_etherdev(size);
362 printk(KERN_ERR "eth_configure: failed to allocate struct "
363 "net_device for eth%d\n", n);
364 goto out_free_device;
367 INIT_LIST_HEAD(&device->list);
370 /* If this name ends up conflicting with an existing registered
371 * netdevice, that is OK, register_netdev{,ice}() will notice this
374 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
376 setup_etheraddr(mac, device->mac, dev->name);
378 printk(KERN_INFO "Netdevice %d ", n);
379 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
380 device->mac[0], device->mac[1],
381 device->mac[2], device->mac[3],
382 device->mac[4], device->mac[5]);
386 /* This points to the transport private data. It's still clear, but we
387 * must memset it to 0 *now*. Let's help the drivers. */
389 INIT_WORK(&lp->work, uml_dev_close);
392 if (!driver_registered) {
393 platform_driver_register(¨_net_driver);
394 driver_registered = 1;
397 device->pdev.name = DRIVER_NAME;
398 device->pdev.dev.release = net_device_release;
399 device->pdev.dev.driver_data = device;
400 if (platform_device_register(&device->pdev))
401 goto out_free_netdev;
402 SET_NETDEV_DEV(dev,&device->pdev.dev);
407 * These just fill in a data structure, so there's no failure
408 * to be worried about.
410 (*transport->kern->init)(dev, init);
412 *lp = ((struct uml_net_private)
413 { .list = LIST_HEAD_INIT(lp->list),
416 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
417 .max_packet = transport->user->max_packet,
418 .protocol = transport->kern->protocol,
419 .open = transport->user->open,
420 .close = transport->user->close,
421 .remove = transport->user->remove,
422 .read = transport->kern->read,
423 .write = transport->kern->write,
424 .add_address = transport->user->add_address,
425 .delete_address = transport->user->delete_address });
428 spin_lock_init(&lp->lock);
429 lp->tl.function = uml_net_user_timer_expire;
430 memcpy(lp->mac, device->mac, sizeof(lp->mac));
432 if ((transport->user->init != NULL) &&
433 ((*transport->user->init)(&lp->user, dev) != 0))
436 set_ether_mac(dev, device->mac);
437 dev->mtu = transport->user->mtu;
438 dev->open = uml_net_open;
439 dev->hard_start_xmit = uml_net_start_xmit;
440 dev->stop = uml_net_close;
441 dev->get_stats = uml_net_get_stats;
442 dev->set_multicast_list = uml_net_set_multicast_list;
443 dev->tx_timeout = uml_net_tx_timeout;
444 dev->set_mac_address = uml_net_set_mac;
445 dev->change_mtu = uml_net_change_mtu;
446 dev->ethtool_ops = ¨_net_ethtool_ops;
447 dev->watchdog_timeo = (HZ >> 1);
448 dev->irq = UM_ETH_IRQ;
451 err = register_netdevice(dev);
454 goto out_undo_user_init;
456 spin_lock(&devices_lock);
457 list_add(&device->list, &devices);
458 spin_unlock(&devices_lock);
463 if (transport->user->remove != NULL)
464 (*transport->user->remove)(&lp->user);
466 platform_device_unregister(&device->pdev);
467 return; /* platform_device_unregister frees dev and device */
474 static struct uml_net *find_device(int n)
476 struct uml_net *device;
477 struct list_head *ele;
479 spin_lock(&devices_lock);
480 list_for_each(ele, &devices) {
481 device = list_entry(ele, struct uml_net, list);
482 if (device->index == n)
487 spin_unlock(&devices_lock);
491 static int eth_parse(char *str, int *index_out, char **str_out,
495 int n, err = -EINVAL;;
497 n = simple_strtoul(str, &end, 0);
499 *error_out = "Bad device number";
505 *error_out = "Expected '=' after device number";
510 if (find_device(n)) {
511 *error_out = "Device already configured";
521 struct list_head list;
526 static DEFINE_SPINLOCK(transports_lock);
527 static LIST_HEAD(transports);
529 /* Filled in during early boot */
530 static LIST_HEAD(eth_cmd_line);
532 static int check_transport(struct transport *transport, char *eth, int n,
533 void **init_out, char **mac_out)
537 len = strlen(transport->name);
538 if (strncmp(eth, transport->name, len))
544 else if (*eth != '\0')
547 *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
548 if (*init_out == NULL)
551 if (!transport->setup(eth, mac_out, *init_out)) {
558 void register_transport(struct transport *new)
560 struct list_head *ele, *next;
561 struct eth_init *eth;
566 spin_lock(&transports_lock);
567 BUG_ON(!list_empty(&new->list));
568 list_add(&new->list, &transports);
569 spin_unlock(&transports_lock);
571 list_for_each_safe(ele, next, ð_cmd_line) {
572 eth = list_entry(ele, struct eth_init, list);
573 match = check_transport(new, eth->init, eth->index, &init,
577 else if (init != NULL) {
578 eth_configure(eth->index, init, mac, new);
581 list_del(ð->list);
585 static int eth_setup_common(char *str, int index)
587 struct list_head *ele;
588 struct transport *transport;
593 spin_lock(&transports_lock);
594 list_for_each(ele, &transports) {
595 transport = list_entry(ele, struct transport, list);
596 if (!check_transport(transport, str, index, &init, &mac))
599 eth_configure(index, init, mac, transport);
606 spin_unlock(&transports_lock);
610 static int __init eth_setup(char *str)
612 struct eth_init *new;
616 err = eth_parse(str, &n, &str, &error);
618 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
623 new = alloc_bootmem(sizeof(*new));
625 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
629 INIT_LIST_HEAD(&new->list);
633 list_add_tail(&new->list, ð_cmd_line);
637 __setup("eth", eth_setup);
638 __uml_help(eth_setup,
639 "eth[0-9]+=<transport>,<options>\n"
640 " Configure a network device.\n\n"
643 static int net_config(char *str, char **error_out)
647 err = eth_parse(str, &n, &str, error_out);
651 /* This string is broken up and the pieces used by the underlying
652 * driver. So, it is freed only if eth_setup_common fails.
654 str = kstrdup(str, GFP_KERNEL);
656 *error_out = "net_config failed to strdup string";
659 err = !eth_setup_common(str, n);
665 static int net_id(char **str, int *start_out, int *end_out)
670 n = simple_strtoul(*str, &end, 0);
671 if ((*end != '\0') || (end == *str))
680 static int net_remove(int n, char **error_out)
682 struct uml_net *device;
683 struct net_device *dev;
684 struct uml_net_private *lp;
686 device = find_device(n);
694 unregister_netdev(dev);
695 platform_device_unregister(&device->pdev);
700 static struct mc_device net_mc = {
701 .list = LIST_HEAD_INIT(net_mc.list),
703 .config = net_config,
706 .remove = net_remove,
709 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
712 struct in_ifaddr *ifa = ptr;
713 struct net_device *dev = ifa->ifa_dev->dev;
714 struct uml_net_private *lp;
715 void (*proc)(unsigned char *, unsigned char *, void *);
716 unsigned char addr_buf[4], netmask_buf[4];
718 if (dev->open != uml_net_open)
726 proc = lp->add_address;
729 proc = lp->delete_address;
733 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
734 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
735 (*proc)(addr_buf, netmask_buf, &lp->user);
740 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
741 struct notifier_block uml_inetaddr_notifier = {
742 .notifier_call = uml_inetaddr_event,
745 static int uml_net_init(void)
747 struct list_head *ele;
748 struct uml_net_private *lp;
749 struct in_device *ip;
750 struct in_ifaddr *in;
752 mconsole_register_dev(&net_mc);
753 register_inetaddr_notifier(¨_inetaddr_notifier);
755 /* Devices may have been opened already, so the uml_inetaddr_notifier
756 * didn't get a chance to run for them. This fakes it so that
757 * addresses which have already been set up get handled properly.
759 spin_lock(&opened_lock);
760 list_for_each(ele, &opened) {
761 lp = list_entry(ele, struct uml_net_private, list);
762 ip = lp->dev->ip_ptr;
767 uml_inetaddr_event(NULL, NETDEV_UP, in);
771 spin_unlock(&opened_lock);
776 __initcall(uml_net_init);
778 static void close_devices(void)
780 struct list_head *ele;
781 struct uml_net_private *lp;
783 spin_lock(&opened_lock);
784 list_for_each(ele, &opened) {
785 lp = list_entry(ele, struct uml_net_private, list);
786 free_irq(lp->dev->irq, lp->dev);
787 if ((lp->close != NULL) && (lp->fd >= 0))
788 (*lp->close)(lp->fd, &lp->user);
789 if (lp->remove != NULL)
790 (*lp->remove)(&lp->user);
792 spin_unlock(&opened_lock);
795 __uml_exitcall(close_devices);
797 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
801 struct net_device *dev = d;
802 struct in_device *ip = dev->ip_ptr;
803 struct in_ifaddr *in;
804 unsigned char address[4], netmask[4];
806 if (ip == NULL) return;
809 memcpy(address, &in->ifa_address, sizeof(address));
810 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
811 (*cb)(address, netmask, arg);
816 int dev_netmask(void *d, void *m)
818 struct net_device *dev = d;
819 struct in_device *ip = dev->ip_ptr;
820 struct in_ifaddr *in;
821 __be32 *mask_out = m;
830 *mask_out = in->ifa_mask;
834 void *get_output_buffer(int *len_out)
838 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
839 if (ret) *len_out = PAGE_SIZE;
844 void free_output_buffer(void *buffer)
846 free_pages((unsigned long) buffer, 0);
849 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
854 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
855 if (remain != NULL) {
856 printk(KERN_ERR "tap_setup_common - Extra garbage on "
857 "specification : '%s'\n", remain);
864 unsigned short eth_protocol(struct sk_buff *skb)
866 return eth_type_trans(skb, skb->dev);