2 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
3 * James Leu (jleu@mindspring.net).
4 * Copyright (C) 2001 by various other people who didn't put their name here.
5 * Licensed under the GPL.
8 #include "linux/kernel.h"
9 #include "linux/netdevice.h"
10 #include "linux/rtnetlink.h"
11 #include "linux/skbuff.h"
12 #include "linux/socket.h"
13 #include "linux/spinlock.h"
14 #include "linux/module.h"
15 #include "linux/init.h"
16 #include "linux/etherdevice.h"
17 #include "linux/list.h"
18 #include "linux/inetdevice.h"
19 #include "linux/ctype.h"
20 #include "linux/bootmem.h"
21 #include "linux/ethtool.h"
22 #include "linux/platform_device.h"
23 #include "asm/uaccess.h"
24 #include "user_util.h"
25 #include "kern_util.h"
28 #include "mconsole_kern.h"
33 static inline void set_ether_mac(struct net_device *dev, unsigned char *addr)
35 memcpy(dev->dev_addr, addr, ETH_ALEN);
38 #define DRIVER_NAME "uml-netdev"
40 static DEFINE_SPINLOCK(opened_lock);
41 static LIST_HEAD(opened);
43 static int uml_net_rx(struct net_device *dev)
45 struct uml_net_private *lp = dev->priv;
49 /* If we can't allocate memory, try again next round. */
50 skb = dev_alloc_skb(dev->mtu);
52 lp->stats.rx_dropped++;
57 skb_put(skb, dev->mtu);
58 skb->mac.raw = skb->data;
59 pkt_len = (*lp->read)(lp->fd, &skb, lp);
62 skb_trim(skb, pkt_len);
63 skb->protocol = (*lp->protocol)(skb);
66 lp->stats.rx_bytes += skb->len;
67 lp->stats.rx_packets++;
75 static void uml_dev_close(struct work_struct *work)
77 struct uml_net_private *lp =
78 container_of(work, struct uml_net_private, work);
82 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
84 struct net_device *dev = dev_id;
85 struct uml_net_private *lp = dev->priv;
88 if(!netif_running(dev))
92 while((err = uml_net_rx(dev)) > 0) ;
95 "Device '%s' read returned %d, shutting it down\n",
97 /* dev_close can't be called in interrupt context, and takes
99 * And dev_close() can be safely called multiple times on the
100 * same device, since it tests for (dev->flags & IFF_UP). So
101 * there's no harm in delaying the device shutdown.
102 * Furthermore, the workqueue will not re-enqueue an already
103 * enqueued work item. */
104 schedule_work(&lp->work);
107 reactivate_fd(lp->fd, UM_ETH_IRQ);
110 spin_unlock(&lp->lock);
114 static int uml_net_open(struct net_device *dev)
116 struct uml_net_private *lp = dev->priv;
124 lp->fd = (*lp->open)(&lp->user);
130 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
131 IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
133 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
138 lp->tl.data = (unsigned long) &lp->user;
139 netif_start_queue(dev);
141 /* clear buffer - it can happen that the host side of the interface
142 * is full when we get here. In this case, new data is never queued,
143 * SIGIOs never arrive, and the net never works.
145 while((err = uml_net_rx(dev)) > 0) ;
147 spin_lock(&opened_lock);
148 list_add(&lp->list, &opened);
149 spin_unlock(&opened_lock);
153 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
159 static int uml_net_close(struct net_device *dev)
161 struct uml_net_private *lp = dev->priv;
163 netif_stop_queue(dev);
165 free_irq(dev->irq, dev);
166 if(lp->close != NULL)
167 (*lp->close)(lp->fd, &lp->user);
170 spin_lock(&opened_lock);
172 spin_unlock(&opened_lock);
177 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
179 struct uml_net_private *lp = dev->priv;
183 netif_stop_queue(dev);
185 spin_lock_irqsave(&lp->lock, flags);
187 len = (*lp->write)(lp->fd, &skb, lp);
189 if(len == skb->len) {
190 lp->stats.tx_packets++;
191 lp->stats.tx_bytes += skb->len;
192 dev->trans_start = jiffies;
193 netif_start_queue(dev);
195 /* this is normally done in the interrupt when tx finishes */
196 netif_wake_queue(dev);
199 netif_start_queue(dev);
200 lp->stats.tx_dropped++;
203 netif_start_queue(dev);
204 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
207 spin_unlock_irqrestore(&lp->lock, flags);
214 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
216 struct uml_net_private *lp = dev->priv;
220 static void uml_net_set_multicast_list(struct net_device *dev)
222 if (dev->flags & IFF_PROMISC) return;
223 else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
224 else dev->flags &= ~IFF_ALLMULTI;
227 static void uml_net_tx_timeout(struct net_device *dev)
229 dev->trans_start = jiffies;
230 netif_wake_queue(dev);
233 static int uml_net_set_mac(struct net_device *dev, void *addr)
235 struct uml_net_private *lp = dev->priv;
236 struct sockaddr *hwaddr = addr;
238 spin_lock_irq(&lp->lock);
239 set_ether_mac(dev, hwaddr->sa_data);
240 spin_unlock_irq(&lp->lock);
245 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
247 struct uml_net_private *lp = dev->priv;
250 spin_lock_irq(&lp->lock);
252 new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
261 spin_unlock_irq(&lp->lock);
265 static void uml_net_get_drvinfo(struct net_device *dev,
266 struct ethtool_drvinfo *info)
268 strcpy(info->driver, DRIVER_NAME);
269 strcpy(info->version, "42");
272 static struct ethtool_ops uml_net_ethtool_ops = {
273 .get_drvinfo = uml_net_get_drvinfo,
274 .get_link = ethtool_op_get_link,
277 void uml_net_user_timer_expire(unsigned long _conn)
280 struct connection *conn = (struct connection *)_conn;
282 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
287 static void setup_etheraddr(char *str, unsigned char *addr)
296 addr[i] = simple_strtoul(str, &end, 16);
298 ((*end != ':') && (*end != ',') && (*end != '\0'))){
300 "setup_etheraddr: failed to parse '%s' "
301 "as an ethernet address\n", str);
308 "Attempt to assign a broadcast ethernet address to a "
309 "device disallowed\n");
315 random_ether_addr(addr);
318 static DEFINE_SPINLOCK(devices_lock);
319 static LIST_HEAD(devices);
321 static struct platform_driver uml_net_driver = {
326 static int driver_registered;
328 static int eth_configure(int n, void *init, char *mac,
329 struct transport *transport)
331 struct uml_net *device;
332 struct net_device *dev;
333 struct uml_net_private *lp;
336 size = transport->private_size + sizeof(struct uml_net_private) +
337 sizeof(((struct uml_net_private *) 0)->user);
339 device = kzalloc(sizeof(*device), GFP_KERNEL);
340 if (device == NULL) {
341 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
345 INIT_LIST_HEAD(&device->list);
348 spin_lock(&devices_lock);
349 list_add(&device->list, &devices);
350 spin_unlock(&devices_lock);
352 setup_etheraddr(mac, device->mac);
354 printk(KERN_INFO "Netdevice %d ", n);
355 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
356 device->mac[0], device->mac[1],
357 device->mac[2], device->mac[3],
358 device->mac[4], device->mac[5]);
360 dev = alloc_etherdev(size);
362 printk(KERN_ERR "eth_configure: failed to allocate device\n");
367 /* This points to the transport private data. It's still clear, but we
368 * must memset it to 0 *now*. Let's help the drivers. */
370 INIT_WORK(&lp->work, uml_dev_close);
373 if (!driver_registered) {
374 platform_driver_register(¨_net_driver);
375 driver_registered = 1;
378 device->pdev.name = DRIVER_NAME;
379 platform_device_register(&device->pdev);
380 SET_NETDEV_DEV(dev,&device->pdev.dev);
382 /* If this name ends up conflicting with an existing registered
383 * netdevice, that is OK, register_netdev{,ice}() will notice this
386 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
389 (*transport->kern->init)(dev, init);
391 dev->mtu = transport->user->max_packet;
392 dev->open = uml_net_open;
393 dev->hard_start_xmit = uml_net_start_xmit;
394 dev->stop = uml_net_close;
395 dev->get_stats = uml_net_get_stats;
396 dev->set_multicast_list = uml_net_set_multicast_list;
397 dev->tx_timeout = uml_net_tx_timeout;
398 dev->set_mac_address = uml_net_set_mac;
399 dev->change_mtu = uml_net_change_mtu;
400 dev->ethtool_ops = ¨_net_ethtool_ops;
401 dev->watchdog_timeo = (HZ >> 1);
402 dev->irq = UM_ETH_IRQ;
405 err = register_netdevice(dev);
409 /* XXX: should we call ->remove() here? */
414 /* lp.user is the first four bytes of the transport data, which
415 * has already been initialized. This structure assignment will
416 * overwrite that, so we make sure that .user gets overwritten with
417 * what it already has.
420 *lp = ((struct uml_net_private)
421 { .list = LIST_HEAD_INIT(lp->list),
424 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
425 .protocol = transport->kern->protocol,
426 .open = transport->user->open,
427 .close = transport->user->close,
428 .remove = transport->user->remove,
429 .read = transport->kern->read,
430 .write = transport->kern->write,
431 .add_address = transport->user->add_address,
432 .delete_address = transport->user->delete_address,
433 .set_mtu = transport->user->set_mtu,
437 spin_lock_init(&lp->lock);
438 lp->tl.function = uml_net_user_timer_expire;
439 memcpy(lp->mac, device->mac, sizeof(lp->mac));
441 if (transport->user->init)
442 (*transport->user->init)(&lp->user, dev);
444 set_ether_mac(dev, device->mac);
449 static struct uml_net *find_device(int n)
451 struct uml_net *device;
452 struct list_head *ele;
454 spin_lock(&devices_lock);
455 list_for_each(ele, &devices){
456 device = list_entry(ele, struct uml_net, list);
457 if(device->index == n)
462 spin_unlock(&devices_lock);
466 static int eth_parse(char *str, int *index_out, char **str_out,
470 int n, err = -EINVAL;;
472 n = simple_strtoul(str, &end, 0);
474 *error_out = "Bad device number";
480 *error_out = "Expected '=' after device number";
486 *error_out = "Device already configured";
496 struct list_head list;
501 static DEFINE_SPINLOCK(transports_lock);
502 static LIST_HEAD(transports);
504 /* Filled in during early boot */
505 static LIST_HEAD(eth_cmd_line);
507 static int check_transport(struct transport *transport, char *eth, int n,
508 void **init_out, char **mac_out)
512 len = strlen(transport->name);
513 if(strncmp(eth, transport->name, len))
519 else if(*eth != '\0')
522 *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
523 if(*init_out == NULL)
526 if(!transport->setup(eth, mac_out, *init_out)){
533 void register_transport(struct transport *new)
535 struct list_head *ele, *next;
536 struct eth_init *eth;
541 spin_lock(&transports_lock);
542 BUG_ON(!list_empty(&new->list));
543 list_add(&new->list, &transports);
544 spin_unlock(&transports_lock);
546 list_for_each_safe(ele, next, ð_cmd_line){
547 eth = list_entry(ele, struct eth_init, list);
548 match = check_transport(new, eth->init, eth->index, &init,
552 else if(init != NULL){
553 eth_configure(eth->index, init, mac, new);
556 list_del(ð->list);
560 static int eth_setup_common(char *str, int index)
562 struct list_head *ele;
563 struct transport *transport;
568 spin_lock(&transports_lock);
569 list_for_each(ele, &transports){
570 transport = list_entry(ele, struct transport, list);
571 if(!check_transport(transport, str, index, &init, &mac))
574 eth_configure(index, init, mac, transport);
581 spin_unlock(&transports_lock);
585 static int eth_setup(char *str)
587 struct eth_init *new;
591 err = eth_parse(str, &n, &str, &error);
593 printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
598 new = alloc_bootmem(sizeof(*new));
600 printk("eth_init : alloc_bootmem failed\n");
604 INIT_LIST_HEAD(&new->list);
608 list_add_tail(&new->list, ð_cmd_line);
612 __setup("eth", eth_setup);
613 __uml_help(eth_setup,
614 "eth[0-9]+=<transport>,<options>\n"
615 " Configure a network device.\n\n"
618 static int net_config(char *str, char **error_out)
622 err = eth_parse(str, &n, &str, error_out);
626 /* This string is broken up and the pieces used by the underlying
627 * driver. So, it is freed only if eth_setup_common fails.
629 str = kstrdup(str, GFP_KERNEL);
631 *error_out = "net_config failed to strdup string";
634 err = !eth_setup_common(str, n);
640 static int net_id(char **str, int *start_out, int *end_out)
645 n = simple_strtoul(*str, &end, 0);
646 if((*end != '\0') || (end == *str))
655 static int net_remove(int n, char **error_out)
657 struct uml_net *device;
658 struct net_device *dev;
659 struct uml_net_private *lp;
661 device = find_device(n);
669 if(lp->remove != NULL) (*lp->remove)(&lp->user);
670 unregister_netdev(dev);
671 platform_device_unregister(&device->pdev);
673 list_del(&device->list);
679 static struct mc_device net_mc = {
680 .list = LIST_HEAD_INIT(net_mc.list),
682 .config = net_config,
685 .remove = net_remove,
688 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
691 struct in_ifaddr *ifa = ptr;
692 struct net_device *dev = ifa->ifa_dev->dev;
693 struct uml_net_private *lp;
694 void (*proc)(unsigned char *, unsigned char *, void *);
695 unsigned char addr_buf[4], netmask_buf[4];
697 if(dev->open != uml_net_open)
705 proc = lp->add_address;
708 proc = lp->delete_address;
712 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
713 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
714 (*proc)(addr_buf, netmask_buf, &lp->user);
719 /* uml_net_init shouldn't be called twice on two CPUs at the same time */
720 struct notifier_block uml_inetaddr_notifier = {
721 .notifier_call = uml_inetaddr_event,
724 static int uml_net_init(void)
726 struct list_head *ele;
727 struct uml_net_private *lp;
728 struct in_device *ip;
729 struct in_ifaddr *in;
731 mconsole_register_dev(&net_mc);
732 register_inetaddr_notifier(¨_inetaddr_notifier);
734 /* Devices may have been opened already, so the uml_inetaddr_notifier
735 * didn't get a chance to run for them. This fakes it so that
736 * addresses which have already been set up get handled properly.
738 spin_lock(&opened_lock);
739 list_for_each(ele, &opened){
740 lp = list_entry(ele, struct uml_net_private, list);
741 ip = lp->dev->ip_ptr;
746 uml_inetaddr_event(NULL, NETDEV_UP, in);
750 spin_unlock(&opened_lock);
755 __initcall(uml_net_init);
757 static void close_devices(void)
759 struct list_head *ele;
760 struct uml_net_private *lp;
762 spin_lock(&opened_lock);
763 list_for_each(ele, &opened){
764 lp = list_entry(ele, struct uml_net_private, list);
765 free_irq(lp->dev->irq, lp->dev);
766 if((lp->close != NULL) && (lp->fd >= 0))
767 (*lp->close)(lp->fd, &lp->user);
768 if(lp->remove != NULL)
769 (*lp->remove)(&lp->user);
771 spin_unlock(&opened_lock);
774 __uml_exitcall(close_devices);
776 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
778 if((skb != NULL) && (skb_tailroom(skb) < extra)){
779 struct sk_buff *skb2;
781 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
785 if(skb != NULL) skb_put(skb, extra);
789 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
793 struct net_device *dev = d;
794 struct in_device *ip = dev->ip_ptr;
795 struct in_ifaddr *in;
796 unsigned char address[4], netmask[4];
798 if(ip == NULL) return;
801 memcpy(address, &in->ifa_address, sizeof(address));
802 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
803 (*cb)(address, netmask, arg);
808 int dev_netmask(void *d, void *m)
810 struct net_device *dev = d;
811 struct in_device *ip = dev->ip_ptr;
812 struct in_ifaddr *in;
813 __be32 *mask_out = m;
822 *mask_out = in->ifa_mask;
826 void *get_output_buffer(int *len_out)
830 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
831 if(ret) *len_out = PAGE_SIZE;
836 void free_output_buffer(void *buffer)
838 free_pages((unsigned long) buffer, 0);
841 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
846 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
848 printk("tap_setup_common - Extra garbage on specification : "
856 unsigned short eth_protocol(struct sk_buff *skb)
858 return(eth_type_trans(skb, skb->dev));