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: attempt to assign a globally valid ethernet "
347 "address to a device\n");
348 printk(KERN_WARNING "You should better enable the 2nd "
349 "rightmost bit in 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],
359 "Choosing a random ethernet address for device %s\n", name);
360 random_ether_addr(addr);
363 static DEFINE_SPINLOCK(devices_lock);
364 static LIST_HEAD(devices);
366 static struct platform_driver uml_net_driver = {
372 static void net_device_release(struct device *dev)
374 struct uml_net *device = dev->driver_data;
375 struct net_device *netdev = device->dev;
376 struct uml_net_private *lp = netdev->priv;
378 if (lp->remove != NULL)
379 (*lp->remove)(&lp->user);
380 list_del(&device->list);
386 * Ensures that platform_driver_register is called only once by
387 * eth_configure. Will be set in an initcall.
389 static int driver_registered;
391 static void eth_configure(int n, void *init, char *mac,
392 struct transport *transport)
394 struct uml_net *device;
395 struct net_device *dev;
396 struct uml_net_private *lp;
399 size = transport->private_size + sizeof(struct uml_net_private);
401 device = kzalloc(sizeof(*device), GFP_KERNEL);
402 if (device == NULL) {
403 printk(KERN_ERR "eth_configure failed to allocate struct "
408 dev = alloc_etherdev(size);
410 printk(KERN_ERR "eth_configure: failed to allocate struct "
411 "net_device for eth%d\n", n);
412 goto out_free_device;
415 INIT_LIST_HEAD(&device->list);
418 /* If this name ends up conflicting with an existing registered
419 * netdevice, that is OK, register_netdev{,ice}() will notice this
422 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
424 setup_etheraddr(mac, device->mac, dev->name);
426 printk(KERN_INFO "Netdevice %d ", n);
427 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
428 device->mac[0], device->mac[1],
429 device->mac[2], device->mac[3],
430 device->mac[4], device->mac[5]);
434 /* This points to the transport private data. It's still clear, but we
435 * must memset it to 0 *now*. Let's help the drivers. */
437 INIT_WORK(&lp->work, uml_dev_close);
440 if (!driver_registered) {
441 platform_driver_register(¨_net_driver);
442 driver_registered = 1;
445 device->pdev.name = DRIVER_NAME;
446 device->pdev.dev.release = net_device_release;
447 device->pdev.dev.driver_data = device;
448 if (platform_device_register(&device->pdev))
449 goto out_free_netdev;
450 SET_NETDEV_DEV(dev,&device->pdev.dev);
455 * These just fill in a data structure, so there's no failure
456 * to be worried about.
458 (*transport->kern->init)(dev, init);
460 *lp = ((struct uml_net_private)
461 { .list = LIST_HEAD_INIT(lp->list),
464 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
465 .max_packet = transport->user->max_packet,
466 .protocol = transport->kern->protocol,
467 .open = transport->user->open,
468 .close = transport->user->close,
469 .remove = transport->user->remove,
470 .read = transport->kern->read,
471 .write = transport->kern->write,
472 .add_address = transport->user->add_address,
473 .delete_address = transport->user->delete_address });
476 spin_lock_init(&lp->lock);
477 lp->tl.function = uml_net_user_timer_expire;
478 memcpy(lp->mac, device->mac, sizeof(lp->mac));
480 if ((transport->user->init != NULL) &&
481 ((*transport->user->init)(&lp->user, dev) != 0))
484 set_ether_mac(dev, device->mac);
485 dev->mtu = transport->user->mtu;
486 dev->open = uml_net_open;
487 dev->hard_start_xmit = uml_net_start_xmit;
488 dev->stop = uml_net_close;
489 dev->get_stats = uml_net_get_stats;
490 dev->set_multicast_list = uml_net_set_multicast_list;
491 dev->tx_timeout = uml_net_tx_timeout;
492 dev->set_mac_address = uml_net_set_mac;
493 dev->change_mtu = uml_net_change_mtu;
494 dev->ethtool_ops = ¨_net_ethtool_ops;
495 dev->watchdog_timeo = (HZ >> 1);
496 dev->irq = UM_ETH_IRQ;
498 err = update_drop_skb(lp->max_packet);
500 goto out_undo_user_init;
503 err = register_netdevice(dev);
506 goto out_undo_user_init;
508 spin_lock(&devices_lock);
509 list_add(&device->list, &devices);
510 spin_unlock(&devices_lock);
515 if (transport->user->remove != NULL)
516 (*transport->user->remove)(&lp->user);
518 platform_device_unregister(&device->pdev);
519 return; /* platform_device_unregister frees dev and device */
526 static struct uml_net *find_device(int n)
528 struct uml_net *device;
529 struct list_head *ele;
531 spin_lock(&devices_lock);
532 list_for_each(ele, &devices) {
533 device = list_entry(ele, struct uml_net, list);
534 if (device->index == n)
539 spin_unlock(&devices_lock);
543 static int eth_parse(char *str, int *index_out, char **str_out,
547 int n, err = -EINVAL;;
549 n = simple_strtoul(str, &end, 0);
551 *error_out = "Bad device number";
557 *error_out = "Expected '=' after device number";
562 if (find_device(n)) {
563 *error_out = "Device already configured";
573 struct list_head list;
578 static DEFINE_SPINLOCK(transports_lock);
579 static LIST_HEAD(transports);
581 /* Filled in during early boot */
582 static LIST_HEAD(eth_cmd_line);
584 static int check_transport(struct transport *transport, char *eth, int n,
585 void **init_out, char **mac_out)
589 len = strlen(transport->name);
590 if (strncmp(eth, transport->name, len))
596 else if (*eth != '\0')
599 *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
600 if (*init_out == NULL)
603 if (!transport->setup(eth, mac_out, *init_out)) {
610 void register_transport(struct transport *new)
612 struct list_head *ele, *next;
613 struct eth_init *eth;
618 spin_lock(&transports_lock);
619 BUG_ON(!list_empty(&new->list));
620 list_add(&new->list, &transports);
621 spin_unlock(&transports_lock);
623 list_for_each_safe(ele, next, ð_cmd_line) {
624 eth = list_entry(ele, struct eth_init, list);
625 match = check_transport(new, eth->init, eth->index, &init,
629 else if (init != NULL) {
630 eth_configure(eth->index, init, mac, new);
633 list_del(ð->list);
637 static int eth_setup_common(char *str, int index)
639 struct list_head *ele;
640 struct transport *transport;
645 spin_lock(&transports_lock);
646 list_for_each(ele, &transports) {
647 transport = list_entry(ele, struct transport, list);
648 if (!check_transport(transport, str, index, &init, &mac))
651 eth_configure(index, init, mac, transport);
658 spin_unlock(&transports_lock);
662 static int __init eth_setup(char *str)
664 struct eth_init *new;
668 err = eth_parse(str, &n, &str, &error);
670 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
675 new = alloc_bootmem(sizeof(*new));
677 printk(KERN_ERR "eth_init : alloc_bootmem failed\n");
681 INIT_LIST_HEAD(&new->list);
685 list_add_tail(&new->list, ð_cmd_line);
689 __setup("eth", eth_setup);
690 __uml_help(eth_setup,
691 "eth[0-9]+=<transport>,<options>\n"
692 " Configure a network device.\n\n"
695 static int net_config(char *str, char **error_out)
699 err = eth_parse(str, &n, &str, error_out);
703 /* This string is broken up and the pieces used by the underlying
704 * driver. So, it is freed only if eth_setup_common fails.
706 str = kstrdup(str, GFP_KERNEL);
708 *error_out = "net_config failed to strdup string";
711 err = !eth_setup_common(str, n);
717 static int net_id(char **str, int *start_out, int *end_out)
722 n = simple_strtoul(*str, &end, 0);
723 if ((*end != '\0') || (end == *str))
732 static int net_remove(int n, char **error_out)
734 struct uml_net *device;
735 struct net_device *dev;
736 struct uml_net_private *lp;
738 device = find_device(n);
746 unregister_netdev(dev);
747 platform_device_unregister(&device->pdev);
752 static struct mc_device net_mc = {
753 .list = LIST_HEAD_INIT(net_mc.list),
755 .config = net_config,
758 .remove = net_remove,
762 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
765 struct in_ifaddr *ifa = ptr;
766 struct net_device *dev = ifa->ifa_dev->dev;
767 struct uml_net_private *lp;
768 void (*proc)(unsigned char *, unsigned char *, void *);
769 unsigned char addr_buf[4], netmask_buf[4];
771 if (dev->open != uml_net_open)
779 proc = lp->add_address;
782 proc = lp->delete_address;
786 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
787 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
788 (*proc)(addr_buf, netmask_buf, &lp->user);
793 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
794 struct notifier_block uml_inetaddr_notifier = {
795 .notifier_call = uml_inetaddr_event,
798 static void inet_register(void)
800 struct list_head *ele;
801 struct uml_net_private *lp;
802 struct in_device *ip;
803 struct in_ifaddr *in;
805 register_inetaddr_notifier(¨_inetaddr_notifier);
807 /* Devices may have been opened already, so the uml_inetaddr_notifier
808 * didn't get a chance to run for them. This fakes it so that
809 * addresses which have already been set up get handled properly.
811 spin_lock(&opened_lock);
812 list_for_each(ele, &opened) {
813 lp = list_entry(ele, struct uml_net_private, list);
814 ip = lp->dev->ip_ptr;
819 uml_inetaddr_event(NULL, NETDEV_UP, in);
823 spin_unlock(&opened_lock);
826 static inline void inet_register(void)
831 static int uml_net_init(void)
833 mconsole_register_dev(&net_mc);
838 __initcall(uml_net_init);
840 static void close_devices(void)
842 struct list_head *ele;
843 struct uml_net_private *lp;
845 spin_lock(&opened_lock);
846 list_for_each(ele, &opened) {
847 lp = list_entry(ele, struct uml_net_private, list);
848 free_irq(lp->dev->irq, lp->dev);
849 if ((lp->close != NULL) && (lp->fd >= 0))
850 (*lp->close)(lp->fd, &lp->user);
851 if (lp->remove != NULL)
852 (*lp->remove)(&lp->user);
854 spin_unlock(&opened_lock);
857 __uml_exitcall(close_devices);
859 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
863 struct net_device *dev = d;
864 struct in_device *ip = dev->ip_ptr;
865 struct in_ifaddr *in;
866 unsigned char address[4], netmask[4];
868 if (ip == NULL) return;
871 memcpy(address, &in->ifa_address, sizeof(address));
872 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
873 (*cb)(address, netmask, arg);
878 int dev_netmask(void *d, void *m)
880 struct net_device *dev = d;
881 struct in_device *ip = dev->ip_ptr;
882 struct in_ifaddr *in;
883 __be32 *mask_out = m;
892 *mask_out = in->ifa_mask;
896 void *get_output_buffer(int *len_out)
900 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
901 if (ret) *len_out = PAGE_SIZE;
906 void free_output_buffer(void *buffer)
908 free_pages((unsigned long) buffer, 0);
911 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
916 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
917 if (remain != NULL) {
918 printk(KERN_ERR "tap_setup_common - Extra garbage on "
919 "specification : '%s'\n", remain);
926 unsigned short eth_protocol(struct sk_buff *skb)
928 return eth_type_trans(skb, skb->dev);