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);
38 * The drop_skb is used when we can't allocate an skb. The
39 * packet is read into drop_skb in order to get the data off the
40 * connection to the host.
41 * It is reallocated whenever a maximum packet size is seen which is
42 * larger than any seen before. update_drop_skb is called from
43 * eth_configure when a new interface is added.
45 static DEFINE_SPINLOCK(drop_lock);
46 static struct sk_buff *drop_skb;
49 static int update_drop_skb(int max)
55 spin_lock_irqsave(&drop_lock, flags);
61 new = dev_alloc_skb(max);
72 spin_unlock_irqrestore(&drop_lock, flags);
77 static int uml_net_rx(struct net_device *dev)
79 struct uml_net_private *lp = dev->priv;
83 /* If we can't allocate memory, try again next round. */
84 skb = dev_alloc_skb(lp->max_packet);
87 /* Read a packet into drop_skb and don't do anything with it. */
88 (*lp->read)(lp->fd, drop_skb, lp);
89 lp->stats.rx_dropped++;
94 skb_put(skb, lp->max_packet);
95 skb_reset_mac_header(skb);
96 pkt_len = (*lp->read)(lp->fd, skb, lp);
99 skb_trim(skb, pkt_len);
100 skb->protocol = (*lp->protocol)(skb);
102 lp->stats.rx_bytes += skb->len;
103 lp->stats.rx_packets++;
112 static void uml_dev_close(struct work_struct *work)
114 struct uml_net_private *lp =
115 container_of(work, struct uml_net_private, work);
119 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
121 struct net_device *dev = dev_id;
122 struct uml_net_private *lp = dev->priv;
125 if (!netif_running(dev))
128 spin_lock(&lp->lock);
129 while ((err = uml_net_rx(dev)) > 0) ;
132 "Device '%s' read returned %d, shutting it down\n",
134 /* dev_close can't be called in interrupt context, and takes
136 * And dev_close() can be safely called multiple times on the
137 * same device, since it tests for (dev->flags & IFF_UP). So
138 * there's no harm in delaying the device shutdown.
139 * Furthermore, the workqueue will not re-enqueue an already
140 * enqueued work item. */
141 schedule_work(&lp->work);
144 reactivate_fd(lp->fd, UM_ETH_IRQ);
147 spin_unlock(&lp->lock);
151 static int uml_net_open(struct net_device *dev)
153 struct uml_net_private *lp = dev->priv;
161 lp->fd = (*lp->open)(&lp->user);
167 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
168 IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
170 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
175 lp->tl.data = (unsigned long) &lp->user;
176 netif_start_queue(dev);
178 /* clear buffer - it can happen that the host side of the interface
179 * is full when we get here. In this case, new data is never queued,
180 * SIGIOs never arrive, and the net never works.
182 while ((err = uml_net_rx(dev)) > 0) ;
184 spin_lock(&opened_lock);
185 list_add(&lp->list, &opened);
186 spin_unlock(&opened_lock);
190 if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
196 static int uml_net_close(struct net_device *dev)
198 struct uml_net_private *lp = dev->priv;
200 netif_stop_queue(dev);
202 free_irq(dev->irq, dev);
203 if (lp->close != NULL)
204 (*lp->close)(lp->fd, &lp->user);
207 spin_lock(&opened_lock);
209 spin_unlock(&opened_lock);
214 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
216 struct uml_net_private *lp = dev->priv;
220 netif_stop_queue(dev);
222 spin_lock_irqsave(&lp->lock, flags);
224 len = (*lp->write)(lp->fd, skb, lp);
226 if (len == skb->len) {
227 lp->stats.tx_packets++;
228 lp->stats.tx_bytes += skb->len;
229 dev->trans_start = jiffies;
230 netif_start_queue(dev);
232 /* this is normally done in the interrupt when tx finishes */
233 netif_wake_queue(dev);
236 netif_start_queue(dev);
237 lp->stats.tx_dropped++;
240 netif_start_queue(dev);
241 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
244 spin_unlock_irqrestore(&lp->lock, flags);
251 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
253 struct uml_net_private *lp = dev->priv;
257 static void uml_net_set_multicast_list(struct net_device *dev)
259 if (dev->flags & IFF_PROMISC)
261 else if (dev->mc_count)
262 dev->flags |= IFF_ALLMULTI;
263 else dev->flags &= ~IFF_ALLMULTI;
266 static void uml_net_tx_timeout(struct net_device *dev)
268 dev->trans_start = jiffies;
269 netif_wake_queue(dev);
272 static int uml_net_set_mac(struct net_device *dev, void *addr)
274 struct uml_net_private *lp = dev->priv;
275 struct sockaddr *hwaddr = addr;
277 spin_lock_irq(&lp->lock);
278 set_ether_mac(dev, hwaddr->sa_data);
279 spin_unlock_irq(&lp->lock);
284 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
291 static void uml_net_get_drvinfo(struct net_device *dev,
292 struct ethtool_drvinfo *info)
294 strcpy(info->driver, DRIVER_NAME);
295 strcpy(info->version, "42");
298 static struct ethtool_ops uml_net_ethtool_ops = {
299 .get_drvinfo = uml_net_get_drvinfo,
300 .get_link = ethtool_op_get_link,
303 void uml_net_user_timer_expire(unsigned long _conn)
306 struct connection *conn = (struct connection *)_conn;
308 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
313 static void setup_etheraddr(char *str, unsigned char *addr, char *name)
321 for (i = 0; i < 6; i++) {
322 addr[i] = simple_strtoul(str, &end, 16);
324 ((*end != ':') && (*end != ',') && (*end != '\0'))) {
326 "setup_etheraddr: failed to parse '%s' "
327 "as an ethernet address\n", str);
332 if (is_multicast_ether_addr(addr)) {
334 "Attempt to assign a multicast ethernet address to a "
335 "device disallowed\n");
338 if (!is_valid_ether_addr(addr)) {
340 "Attempt to assign an invalid ethernet address to a "
341 "device disallowed\n");
344 if (!is_local_ether_addr(addr)) {
346 "Warning: Assigning a globally valid ethernet "
347 "address to a device\n");
348 printk(KERN_WARNING "You should set the 2nd rightmost bit in "
349 "the first byte of the MAC,\n");
350 printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
351 addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
358 "Choosing a random ethernet address for device %s\n", name);
359 random_ether_addr(addr);
362 static DEFINE_SPINLOCK(devices_lock);
363 static LIST_HEAD(devices);
365 static struct platform_driver uml_net_driver = {
371 static void net_device_release(struct device *dev)
373 struct uml_net *device = dev->driver_data;
374 struct net_device *netdev = device->dev;
375 struct uml_net_private *lp = netdev->priv;
377 if (lp->remove != NULL)
378 (*lp->remove)(&lp->user);
379 list_del(&device->list);
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;
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 "
407 dev = alloc_etherdev(size);
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);
417 /* If this name ends up conflicting with an existing registered
418 * netdevice, that is OK, register_netdev{,ice}() will notice this
421 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
423 setup_etheraddr(mac, device->mac, dev->name);
425 printk(KERN_INFO "Netdevice %d ", n);
426 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
427 device->mac[0], device->mac[1],
428 device->mac[2], device->mac[3],
429 device->mac[4], device->mac[5]);
433 /* This points to the transport private data. It's still clear, but we
434 * must memset it to 0 *now*. Let's help the drivers. */
436 INIT_WORK(&lp->work, uml_dev_close);
439 if (!driver_registered) {
440 platform_driver_register(¨_net_driver);
441 driver_registered = 1;
444 device->pdev.name = DRIVER_NAME;
445 device->pdev.dev.release = net_device_release;
446 device->pdev.dev.driver_data = device;
447 if (platform_device_register(&device->pdev))
448 goto out_free_netdev;
449 SET_NETDEV_DEV(dev,&device->pdev.dev);
454 * These just fill in a data structure, so there's no failure
455 * to be worried about.
457 (*transport->kern->init)(dev, init);
459 *lp = ((struct uml_net_private)
460 { .list = LIST_HEAD_INIT(lp->list),
463 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
464 .max_packet = transport->user->max_packet,
465 .protocol = transport->kern->protocol,
466 .open = transport->user->open,
467 .close = transport->user->close,
468 .remove = transport->user->remove,
469 .read = transport->kern->read,
470 .write = transport->kern->write,
471 .add_address = transport->user->add_address,
472 .delete_address = transport->user->delete_address });
475 spin_lock_init(&lp->lock);
476 lp->tl.function = uml_net_user_timer_expire;
477 memcpy(lp->mac, device->mac, sizeof(lp->mac));
479 if ((transport->user->init != NULL) &&
480 ((*transport->user->init)(&lp->user, dev) != 0))
483 set_ether_mac(dev, device->mac);
484 dev->mtu = transport->user->mtu;
485 dev->open = uml_net_open;
486 dev->hard_start_xmit = uml_net_start_xmit;
487 dev->stop = uml_net_close;
488 dev->get_stats = uml_net_get_stats;
489 dev->set_multicast_list = uml_net_set_multicast_list;
490 dev->tx_timeout = uml_net_tx_timeout;
491 dev->set_mac_address = uml_net_set_mac;
492 dev->change_mtu = uml_net_change_mtu;
493 dev->ethtool_ops = ¨_net_ethtool_ops;
494 dev->watchdog_timeo = (HZ >> 1);
495 dev->irq = UM_ETH_IRQ;
497 err = update_drop_skb(lp->max_packet);
499 goto out_undo_user_init;
502 err = register_netdevice(dev);
505 goto out_undo_user_init;
507 spin_lock(&devices_lock);
508 list_add(&device->list, &devices);
509 spin_unlock(&devices_lock);
514 if (transport->user->remove != NULL)
515 (*transport->user->remove)(&lp->user);
517 platform_device_unregister(&device->pdev);
518 return; /* platform_device_unregister frees dev and device */
525 static struct uml_net *find_device(int n)
527 struct uml_net *device;
528 struct list_head *ele;
530 spin_lock(&devices_lock);
531 list_for_each(ele, &devices) {
532 device = list_entry(ele, struct uml_net, list);
533 if (device->index == n)
538 spin_unlock(&devices_lock);
542 static int eth_parse(char *str, int *index_out, char **str_out,
546 int n, err = -EINVAL;;
548 n = simple_strtoul(str, &end, 0);
550 *error_out = "Bad device number";
556 *error_out = "Expected '=' after device number";
561 if (find_device(n)) {
562 *error_out = "Device already configured";
572 struct list_head list;
577 static DEFINE_SPINLOCK(transports_lock);
578 static LIST_HEAD(transports);
580 /* Filled in during early boot */
581 static LIST_HEAD(eth_cmd_line);
583 static int check_transport(struct transport *transport, char *eth, int n,
584 void **init_out, char **mac_out)
588 len = strlen(transport->name);
589 if (strncmp(eth, transport->name, len))
595 else if (*eth != '\0')
598 *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
599 if (*init_out == NULL)
602 if (!transport->setup(eth, mac_out, *init_out)) {
609 void register_transport(struct transport *new)
611 struct list_head *ele, *next;
612 struct eth_init *eth;
617 spin_lock(&transports_lock);
618 BUG_ON(!list_empty(&new->list));
619 list_add(&new->list, &transports);
620 spin_unlock(&transports_lock);
622 list_for_each_safe(ele, next, ð_cmd_line) {
623 eth = list_entry(ele, struct eth_init, list);
624 match = check_transport(new, eth->init, eth->index, &init,
628 else if (init != NULL) {
629 eth_configure(eth->index, init, mac, new);
632 list_del(ð->list);
636 static int eth_setup_common(char *str, int index)
638 struct list_head *ele;
639 struct transport *transport;
644 spin_lock(&transports_lock);
645 list_for_each(ele, &transports) {
646 transport = list_entry(ele, struct transport, list);
647 if (!check_transport(transport, str, index, &init, &mac))
650 eth_configure(index, init, mac, transport);
657 spin_unlock(&transports_lock);
661 static int __init eth_setup(char *str)
663 struct eth_init *new;
667 err = eth_parse(str, &n, &str, &error);
669 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
674 new = alloc_bootmem(sizeof(*new));
676 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
680 INIT_LIST_HEAD(&new->list);
684 list_add_tail(&new->list, ð_cmd_line);
688 __setup("eth", eth_setup);
689 __uml_help(eth_setup,
690 "eth[0-9]+=<transport>,<options>\n"
691 " Configure a network device.\n\n"
694 static int net_config(char *str, char **error_out)
698 err = eth_parse(str, &n, &str, error_out);
702 /* This string is broken up and the pieces used by the underlying
703 * driver. So, it is freed only if eth_setup_common fails.
705 str = kstrdup(str, GFP_KERNEL);
707 *error_out = "net_config failed to strdup string";
710 err = !eth_setup_common(str, n);
716 static int net_id(char **str, int *start_out, int *end_out)
721 n = simple_strtoul(*str, &end, 0);
722 if ((*end != '\0') || (end == *str))
731 static int net_remove(int n, char **error_out)
733 struct uml_net *device;
734 struct net_device *dev;
735 struct uml_net_private *lp;
737 device = find_device(n);
745 unregister_netdev(dev);
746 platform_device_unregister(&device->pdev);
751 static struct mc_device net_mc = {
752 .list = LIST_HEAD_INIT(net_mc.list),
754 .config = net_config,
757 .remove = net_remove,
761 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
764 struct in_ifaddr *ifa = ptr;
765 struct net_device *dev = ifa->ifa_dev->dev;
766 struct uml_net_private *lp;
767 void (*proc)(unsigned char *, unsigned char *, void *);
768 unsigned char addr_buf[4], netmask_buf[4];
770 if (dev->open != uml_net_open)
778 proc = lp->add_address;
781 proc = lp->delete_address;
785 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
786 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
787 (*proc)(addr_buf, netmask_buf, &lp->user);
792 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
793 struct notifier_block uml_inetaddr_notifier = {
794 .notifier_call = uml_inetaddr_event,
797 static void inet_register(void)
799 struct list_head *ele;
800 struct uml_net_private *lp;
801 struct in_device *ip;
802 struct in_ifaddr *in;
804 register_inetaddr_notifier(¨_inetaddr_notifier);
806 /* Devices may have been opened already, so the uml_inetaddr_notifier
807 * didn't get a chance to run for them. This fakes it so that
808 * addresses which have already been set up get handled properly.
810 spin_lock(&opened_lock);
811 list_for_each(ele, &opened) {
812 lp = list_entry(ele, struct uml_net_private, list);
813 ip = lp->dev->ip_ptr;
818 uml_inetaddr_event(NULL, NETDEV_UP, in);
822 spin_unlock(&opened_lock);
825 static inline void inet_register(void)
830 static int uml_net_init(void)
832 mconsole_register_dev(&net_mc);
837 __initcall(uml_net_init);
839 static void close_devices(void)
841 struct list_head *ele;
842 struct uml_net_private *lp;
844 spin_lock(&opened_lock);
845 list_for_each(ele, &opened) {
846 lp = list_entry(ele, struct uml_net_private, list);
847 free_irq(lp->dev->irq, lp->dev);
848 if ((lp->close != NULL) && (lp->fd >= 0))
849 (*lp->close)(lp->fd, &lp->user);
850 if (lp->remove != NULL)
851 (*lp->remove)(&lp->user);
853 spin_unlock(&opened_lock);
856 __uml_exitcall(close_devices);
858 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
862 struct net_device *dev = d;
863 struct in_device *ip = dev->ip_ptr;
864 struct in_ifaddr *in;
865 unsigned char address[4], netmask[4];
867 if (ip == NULL) return;
870 memcpy(address, &in->ifa_address, sizeof(address));
871 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
872 (*cb)(address, netmask, arg);
877 int dev_netmask(void *d, void *m)
879 struct net_device *dev = d;
880 struct in_device *ip = dev->ip_ptr;
881 struct in_ifaddr *in;
882 __be32 *mask_out = m;
891 *mask_out = in->ifa_mask;
895 void *get_output_buffer(int *len_out)
899 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
900 if (ret) *len_out = PAGE_SIZE;
905 void free_output_buffer(void *buffer)
907 free_pages((unsigned long) buffer, 0);
910 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
915 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
916 if (remain != NULL) {
917 printk(KERN_ERR "tap_setup_common - Extra garbage on "
918 "specification : '%s'\n", remain);
925 unsigned short eth_protocol(struct sk_buff *skb)
927 return eth_type_trans(skb, skb->dev);