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/slab.h>
20 #include <linux/spinlock.h>
24 #include "mconsole_kern.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;
45 static int update_drop_skb(int max)
51 spin_lock_irqsave(&drop_lock, flags);
57 new = dev_alloc_skb(max);
68 spin_unlock_irqrestore(&drop_lock, flags);
73 static int uml_net_rx(struct net_device *dev)
75 struct uml_net_private *lp = netdev_priv(dev);
79 /* If we can't allocate memory, try again next round. */
80 skb = dev_alloc_skb(lp->max_packet);
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++;
90 skb_put(skb, lp->max_packet);
91 skb_reset_mac_header(skb);
92 pkt_len = (*lp->read)(lp->fd, skb, lp);
95 skb_trim(skb, pkt_len);
96 skb->protocol = (*lp->protocol)(skb);
98 dev->stats.rx_bytes += skb->len;
99 dev->stats.rx_packets++;
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);
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);
121 if (!netif_running(dev))
124 spin_lock(&lp->lock);
125 while ((err = uml_net_rx(dev)) > 0) ;
128 "Device '%s' read returned %d, shutting it down\n",
130 /* dev_close can't be called in interrupt context, and takes
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);
140 reactivate_fd(lp->fd, UM_ETH_IRQ);
143 spin_unlock(&lp->lock);
147 static int uml_net_open(struct net_device *dev)
149 struct uml_net_private *lp = netdev_priv(dev);
157 lp->fd = (*lp->open)(&lp->user);
163 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
164 IRQF_SHARED, dev->name, dev);
166 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
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);
186 if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
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);
203 spin_lock(&opened_lock);
205 spin_unlock(&opened_lock);
210 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
212 struct uml_net_private *lp = netdev_priv(dev);
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 netif_trans_update(dev);
227 netif_start_queue(dev);
229 /* this is normally done in the interrupt when tx finishes */
230 netif_wake_queue(dev);
233 netif_start_queue(dev);
234 dev->stats.tx_dropped++;
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);
248 static void uml_net_set_multicast_list(struct net_device *dev)
253 static void uml_net_tx_timeout(struct net_device *dev)
255 netif_trans_update(dev);
256 netif_wake_queue(dev);
259 #ifdef CONFIG_NET_POLL_CONTROLLER
260 static void uml_net_poll_controller(struct net_device *dev)
262 disable_irq(dev->irq);
263 uml_net_interrupt(dev->irq, dev);
264 enable_irq(dev->irq);
268 static void uml_net_get_drvinfo(struct net_device *dev,
269 struct ethtool_drvinfo *info)
271 strlcpy(info->driver, DRIVER_NAME, sizeof(info->driver));
272 strlcpy(info->version, "42", sizeof(info->version));
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,
281 static void uml_net_user_timer_expire(unsigned long _conn)
284 struct connection *conn = (struct connection *)_conn;
286 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
291 static void setup_etheraddr(struct net_device *dev, char *str)
293 unsigned char *addr = dev->dev_addr;
300 for (i = 0; i < 6; i++) {
301 addr[i] = simple_strtoul(str, &end, 16);
303 ((*end != ':') && (*end != ',') && (*end != '\0'))) {
305 "setup_etheraddr: failed to parse '%s' "
306 "as an ethernet address\n", str);
311 if (is_multicast_ether_addr(addr)) {
313 "Attempt to assign a multicast ethernet address to a "
314 "device disallowed\n");
317 if (!is_valid_ether_addr(addr)) {
319 "Attempt to assign an invalid ethernet address to a "
320 "device disallowed\n");
323 if (!is_local_ether_addr(addr)) {
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],
337 "Choosing a random ethernet address for device %s\n", dev->name);
338 eth_hw_addr_random(dev);
341 static DEFINE_SPINLOCK(devices_lock);
342 static LIST_HEAD(devices);
344 static struct platform_driver uml_net_driver = {
350 static void net_device_release(struct device *dev)
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);
356 if (lp->remove != NULL)
357 (*lp->remove)(&lp->user);
358 list_del(&device->list);
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,
377 * Ensures that platform_driver_register is called only once by
378 * eth_configure. Will be set in an initcall.
380 static int driver_registered;
382 static void eth_configure(int n, void *init, char *mac,
383 struct transport *transport, gfp_t gfp_mask)
385 struct uml_net *device;
386 struct net_device *dev;
387 struct uml_net_private *lp;
390 size = transport->private_size + sizeof(struct uml_net_private);
392 device = kzalloc(sizeof(*device), gfp_mask);
393 if (device == NULL) {
394 printk(KERN_ERR "eth_configure failed to allocate struct "
399 dev = alloc_etherdev(size);
401 printk(KERN_ERR "eth_configure: failed to allocate struct "
402 "net_device for eth%d\n", n);
403 goto out_free_device;
406 INIT_LIST_HEAD(&device->list);
409 /* If this name ends up conflicting with an existing registered
410 * netdevice, that is OK, register_netdev{,ice}() will notice this
413 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
415 setup_etheraddr(dev, mac);
417 printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
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. */
423 INIT_WORK(&lp->work, uml_dev_close);
426 if (!driver_registered) {
427 platform_driver_register(¨_net_driver);
428 driver_registered = 1;
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);
441 * These just fill in a data structure, so there's no failure
442 * to be worried about.
444 (*transport->kern->init)(dev, init);
446 *lp = ((struct uml_net_private)
447 { .list = LIST_HEAD_INIT(lp->list),
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 });
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));
466 if ((transport->user->init != NULL) &&
467 ((*transport->user->init)(&lp->user, dev) != 0))
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;
476 err = update_drop_skb(lp->max_packet);
478 goto out_undo_user_init;
481 err = register_netdevice(dev);
484 goto out_undo_user_init;
486 spin_lock(&devices_lock);
487 list_add(&device->list, &devices);
488 spin_unlock(&devices_lock);
493 if (transport->user->remove != NULL)
494 (*transport->user->remove)(&lp->user);
496 platform_device_unregister(&device->pdev);
497 return; /* platform_device_unregister frees dev and device */
504 static struct uml_net *find_device(int n)
506 struct uml_net *device;
507 struct list_head *ele;
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)
517 spin_unlock(&devices_lock);
521 static int eth_parse(char *str, int *index_out, char **str_out,
525 int n, err = -EINVAL;
527 n = simple_strtoul(str, &end, 0);
529 *error_out = "Bad device number";
535 *error_out = "Expected '=' after device number";
540 if (find_device(n)) {
541 *error_out = "Device already configured";
551 struct list_head list;
556 static DEFINE_SPINLOCK(transports_lock);
557 static LIST_HEAD(transports);
559 /* Filled in during early boot */
560 static LIST_HEAD(eth_cmd_line);
562 static int check_transport(struct transport *transport, char *eth, int n,
563 void **init_out, char **mac_out, gfp_t gfp_mask)
567 len = strlen(transport->name);
568 if (strncmp(eth, transport->name, len))
574 else if (*eth != '\0')
577 *init_out = kmalloc(transport->setup_size, gfp_mask);
578 if (*init_out == NULL)
581 if (!transport->setup(eth, mac_out, *init_out)) {
588 void register_transport(struct transport *new)
590 struct list_head *ele, *next;
591 struct eth_init *eth;
596 spin_lock(&transports_lock);
597 BUG_ON(!list_empty(&new->list));
598 list_add(&new->list, &transports);
599 spin_unlock(&transports_lock);
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,
607 else if (init != NULL) {
608 eth_configure(eth->index, init, mac, new, GFP_KERNEL);
611 list_del(ð->list);
615 static int eth_setup_common(char *str, int index)
617 struct list_head *ele;
618 struct transport *transport;
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,
630 eth_configure(index, init, mac, transport, GFP_ATOMIC);
637 spin_unlock(&transports_lock);
641 static int __init eth_setup(char *str)
643 struct eth_init *new;
647 err = eth_parse(str, &n, &str, &error);
649 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
654 new = alloc_bootmem(sizeof(*new));
656 INIT_LIST_HEAD(&new->list);
660 list_add_tail(&new->list, ð_cmd_line);
664 __setup("eth", eth_setup);
665 __uml_help(eth_setup,
666 "eth[0-9]+=<transport>,<options>\n"
667 " Configure a network device.\n\n"
670 static int net_config(char *str, char **error_out)
674 err = eth_parse(str, &n, &str, error_out);
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.
681 str = kstrdup(str, GFP_KERNEL);
683 *error_out = "net_config failed to strdup string";
686 err = !eth_setup_common(str, n);
692 static int net_id(char **str, int *start_out, int *end_out)
697 n = simple_strtoul(*str, &end, 0);
698 if ((*end != '\0') || (end == *str))
707 static int net_remove(int n, char **error_out)
709 struct uml_net *device;
710 struct net_device *dev;
711 struct uml_net_private *lp;
713 device = find_device(n);
718 lp = netdev_priv(dev);
721 unregister_netdev(dev);
722 platform_device_unregister(&device->pdev);
727 static struct mc_device net_mc = {
728 .list = LIST_HEAD_INIT(net_mc.list),
730 .config = net_config,
733 .remove = net_remove,
737 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
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];
746 if (dev->netdev_ops->ndo_open != uml_net_open)
749 lp = netdev_priv(dev);
754 proc = lp->add_address;
757 proc = lp->delete_address;
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);
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,
773 static void inet_register(void)
775 struct list_head *ele;
776 struct uml_net_private *lp;
777 struct in_device *ip;
778 struct in_ifaddr *in;
780 register_inetaddr_notifier(¨_inetaddr_notifier);
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.
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;
794 uml_inetaddr_event(NULL, NETDEV_UP, in);
798 spin_unlock(&opened_lock);
801 static inline void inet_register(void)
806 static int uml_net_init(void)
808 mconsole_register_dev(&net_mc);
813 __initcall(uml_net_init);
815 static void close_devices(void)
817 struct list_head *ele;
818 struct uml_net_private *lp;
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);
829 spin_unlock(&opened_lock);
832 __uml_exitcall(close_devices);
834 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
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];
843 if (ip == NULL) return;
846 memcpy(address, &in->ifa_address, sizeof(address));
847 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
848 (*cb)(address, netmask, arg);
853 int dev_netmask(void *d, void *m)
855 struct net_device *dev = d;
856 struct in_device *ip = dev->ip_ptr;
857 struct in_ifaddr *in;
858 __be32 *mask_out = m;
867 *mask_out = in->ifa_mask;
871 void *get_output_buffer(int *len_out)
875 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
876 if (ret) *len_out = PAGE_SIZE;
881 void free_output_buffer(void *buffer)
883 free_pages((unsigned long) buffer, 0);
886 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
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);
901 unsigned short eth_protocol(struct sk_buff *skb)
903 return eth_type_trans(skb, skb->dev);