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(void* dev)
77 dev_close( (struct net_device *) dev);
80 irqreturn_t uml_net_interrupt(int irq, void *dev_id)
82 struct net_device *dev = dev_id;
83 struct uml_net_private *lp = dev->priv;
86 if(!netif_running(dev))
90 while((err = uml_net_rx(dev)) > 0) ;
92 DECLARE_WORK(close_work, uml_dev_close, dev);
94 "Device '%s' read returned %d, shutting it down\n",
96 /* dev_close can't be called in interrupt context, and takes
98 * And dev_close() can be safely called multiple times on the
99 * same device, since it tests for (dev->flags & IFF_UP). So
100 * there's no harm in delaying the device shutdown. */
101 schedule_work(&close_work);
104 reactivate_fd(lp->fd, UM_ETH_IRQ);
107 spin_unlock(&lp->lock);
111 static int uml_net_open(struct net_device *dev)
113 struct uml_net_private *lp = dev->priv;
121 lp->fd = (*lp->open)(&lp->user);
127 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
128 IRQF_DISABLED | IRQF_SHARED, dev->name, dev);
130 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
135 lp->tl.data = (unsigned long) &lp->user;
136 netif_start_queue(dev);
138 /* clear buffer - it can happen that the host side of the interface
139 * is full when we get here. In this case, new data is never queued,
140 * SIGIOs never arrive, and the net never works.
142 while((err = uml_net_rx(dev)) > 0) ;
144 spin_lock(&opened_lock);
145 list_add(&lp->list, &opened);
146 spin_unlock(&opened_lock);
150 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
156 static int uml_net_close(struct net_device *dev)
158 struct uml_net_private *lp = dev->priv;
160 netif_stop_queue(dev);
162 free_irq(dev->irq, dev);
163 if(lp->close != NULL)
164 (*lp->close)(lp->fd, &lp->user);
167 spin_lock(&opened_lock);
169 spin_unlock(&opened_lock);
174 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
176 struct uml_net_private *lp = dev->priv;
180 netif_stop_queue(dev);
182 spin_lock_irqsave(&lp->lock, flags);
184 len = (*lp->write)(lp->fd, &skb, lp);
186 if(len == skb->len) {
187 lp->stats.tx_packets++;
188 lp->stats.tx_bytes += skb->len;
189 dev->trans_start = jiffies;
190 netif_start_queue(dev);
192 /* this is normally done in the interrupt when tx finishes */
193 netif_wake_queue(dev);
196 netif_start_queue(dev);
197 lp->stats.tx_dropped++;
200 netif_start_queue(dev);
201 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
204 spin_unlock_irqrestore(&lp->lock, flags);
211 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
213 struct uml_net_private *lp = dev->priv;
217 static void uml_net_set_multicast_list(struct net_device *dev)
219 if (dev->flags & IFF_PROMISC) return;
220 else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
221 else dev->flags &= ~IFF_ALLMULTI;
224 static void uml_net_tx_timeout(struct net_device *dev)
226 dev->trans_start = jiffies;
227 netif_wake_queue(dev);
230 static int uml_net_set_mac(struct net_device *dev, void *addr)
232 struct uml_net_private *lp = dev->priv;
233 struct sockaddr *hwaddr = addr;
235 spin_lock_irq(&lp->lock);
236 set_ether_mac(dev, hwaddr->sa_data);
237 spin_unlock_irq(&lp->lock);
242 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
244 struct uml_net_private *lp = dev->priv;
247 spin_lock_irq(&lp->lock);
249 new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
258 spin_unlock_irq(&lp->lock);
262 static void uml_net_get_drvinfo(struct net_device *dev,
263 struct ethtool_drvinfo *info)
265 strcpy(info->driver, DRIVER_NAME);
266 strcpy(info->version, "42");
269 static struct ethtool_ops uml_net_ethtool_ops = {
270 .get_drvinfo = uml_net_get_drvinfo,
271 .get_link = ethtool_op_get_link,
274 void uml_net_user_timer_expire(unsigned long _conn)
277 struct connection *conn = (struct connection *)_conn;
279 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
284 static void setup_etheraddr(char *str, unsigned char *addr)
293 addr[i] = simple_strtoul(str, &end, 16);
295 ((*end != ':') && (*end != ',') && (*end != '\0'))){
297 "setup_etheraddr: failed to parse '%s' "
298 "as an ethernet address\n", str);
305 "Attempt to assign a broadcast ethernet address to a "
306 "device disallowed\n");
312 random_ether_addr(addr);
315 static DEFINE_SPINLOCK(devices_lock);
316 static LIST_HEAD(devices);
318 static struct platform_driver uml_net_driver = {
323 static int driver_registered;
325 static int eth_configure(int n, void *init, char *mac,
326 struct transport *transport)
328 struct uml_net *device;
329 struct net_device *dev;
330 struct uml_net_private *lp;
333 size = transport->private_size + sizeof(struct uml_net_private) +
334 sizeof(((struct uml_net_private *) 0)->user);
336 device = kmalloc(sizeof(*device), GFP_KERNEL);
337 if (device == NULL) {
338 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
342 memset(device, 0, sizeof(*device));
343 INIT_LIST_HEAD(&device->list);
346 spin_lock(&devices_lock);
347 list_add(&device->list, &devices);
348 spin_unlock(&devices_lock);
350 setup_etheraddr(mac, device->mac);
352 printk(KERN_INFO "Netdevice %d ", n);
353 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
354 device->mac[0], device->mac[1],
355 device->mac[2], device->mac[3],
356 device->mac[4], device->mac[5]);
358 dev = alloc_etherdev(size);
360 printk(KERN_ERR "eth_configure: failed to allocate device\n");
365 /* This points to the transport private data. It's still clear, but we
366 * must memset it to 0 *now*. Let's help the drivers. */
370 if (!driver_registered) {
371 platform_driver_register(¨_net_driver);
372 driver_registered = 1;
375 device->pdev.name = DRIVER_NAME;
376 platform_device_register(&device->pdev);
377 SET_NETDEV_DEV(dev,&device->pdev.dev);
379 /* If this name ends up conflicting with an existing registered
380 * netdevice, that is OK, register_netdev{,ice}() will notice this
383 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
386 (*transport->kern->init)(dev, init);
388 dev->mtu = transport->user->max_packet;
389 dev->open = uml_net_open;
390 dev->hard_start_xmit = uml_net_start_xmit;
391 dev->stop = uml_net_close;
392 dev->get_stats = uml_net_get_stats;
393 dev->set_multicast_list = uml_net_set_multicast_list;
394 dev->tx_timeout = uml_net_tx_timeout;
395 dev->set_mac_address = uml_net_set_mac;
396 dev->change_mtu = uml_net_change_mtu;
397 dev->ethtool_ops = ¨_net_ethtool_ops;
398 dev->watchdog_timeo = (HZ >> 1);
399 dev->irq = UM_ETH_IRQ;
402 err = register_netdevice(dev);
406 /* XXX: should we call ->remove() here? */
411 /* lp.user is the first four bytes of the transport data, which
412 * has already been initialized. This structure assignment will
413 * overwrite that, so we make sure that .user gets overwritten with
414 * what it already has.
417 *lp = ((struct uml_net_private)
418 { .list = LIST_HEAD_INIT(lp->list),
421 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
422 .protocol = transport->kern->protocol,
423 .open = transport->user->open,
424 .close = transport->user->close,
425 .remove = transport->user->remove,
426 .read = transport->kern->read,
427 .write = transport->kern->write,
428 .add_address = transport->user->add_address,
429 .delete_address = transport->user->delete_address,
430 .set_mtu = transport->user->set_mtu,
434 spin_lock_init(&lp->lock);
435 lp->tl.function = uml_net_user_timer_expire;
436 memcpy(lp->mac, device->mac, sizeof(lp->mac));
438 if (transport->user->init)
439 (*transport->user->init)(&lp->user, dev);
441 set_ether_mac(dev, device->mac);
446 static struct uml_net *find_device(int n)
448 struct uml_net *device;
449 struct list_head *ele;
451 spin_lock(&devices_lock);
452 list_for_each(ele, &devices){
453 device = list_entry(ele, struct uml_net, list);
454 if(device->index == n)
459 spin_unlock(&devices_lock);
463 static int eth_parse(char *str, int *index_out, char **str_out)
468 n = simple_strtoul(str, &end, 0);
470 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
474 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
480 "eth_setup: expected '=' after device number\n");
485 printk(KERN_ERR "eth_setup: Device %d already configured\n",
489 if(index_out) *index_out = n;
495 struct list_head list;
500 /* Filled in at boot time. Will need locking if the transports become
503 struct list_head transports = LIST_HEAD_INIT(transports);
505 /* Filled in during early boot */
506 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
508 static int check_transport(struct transport *transport, char *eth, int n,
509 void **init_out, char **mac_out)
513 len = strlen(transport->name);
514 if(strncmp(eth, transport->name, len))
520 else if(*eth != '\0')
523 *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
524 if(*init_out == NULL)
527 if(!transport->setup(eth, mac_out, *init_out)){
534 void register_transport(struct transport *new)
536 struct list_head *ele, *next;
537 struct eth_init *eth;
542 list_add(&new->list, &transports);
544 list_for_each_safe(ele, next, ð_cmd_line){
545 eth = list_entry(ele, struct eth_init, list);
546 match = check_transport(new, eth->init, eth->index, &init,
550 else if(init != NULL){
551 eth_configure(eth->index, init, mac, new);
554 list_del(ð->list);
558 static int eth_setup_common(char *str, int index)
560 struct list_head *ele;
561 struct transport *transport;
565 list_for_each(ele, &transports){
566 transport = list_entry(ele, struct transport, list);
567 if(!check_transport(transport, str, index, &init, &mac))
570 eth_configure(index, init, mac, transport);
578 static int eth_setup(char *str)
580 struct eth_init *new;
583 err = eth_parse(str, &n, &str);
587 new = alloc_bootmem(sizeof(*new));
589 printk("eth_init : alloc_bootmem failed\n");
593 INIT_LIST_HEAD(&new->list);
597 list_add_tail(&new->list, ð_cmd_line);
601 __setup("eth", eth_setup);
602 __uml_help(eth_setup,
603 "eth[0-9]+=<transport>,<options>\n"
604 " Configure a network device.\n\n"
608 static int eth_init(void)
610 struct list_head *ele, *next;
611 struct eth_init *eth;
613 list_for_each_safe(ele, next, ð_cmd_line){
614 eth = list_entry(ele, struct eth_init, list);
616 if(eth_setup_common(eth->init, eth->index))
617 list_del(ð->list);
622 __initcall(eth_init);
625 static int net_config(char *str)
629 err = eth_parse(str, &n, &str);
632 str = kstrdup(str, GFP_KERNEL);
634 printk(KERN_ERR "net_config failed to strdup string\n");
637 err = !eth_setup_common(str, n);
643 static int net_id(char **str, int *start_out, int *end_out)
648 n = simple_strtoul(*str, &end, 0);
649 if((*end != '\0') || (end == *str))
658 static int net_remove(int n)
660 struct uml_net *device;
661 struct net_device *dev;
662 struct uml_net_private *lp;
664 device = find_device(n);
672 if(lp->remove != NULL) (*lp->remove)(&lp->user);
673 unregister_netdev(dev);
674 platform_device_unregister(&device->pdev);
676 list_del(&device->list);
682 static struct mc_device net_mc = {
684 .config = net_config,
687 .remove = net_remove,
690 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
693 struct in_ifaddr *ifa = ptr;
694 struct net_device *dev = ifa->ifa_dev->dev;
695 struct uml_net_private *lp;
696 void (*proc)(unsigned char *, unsigned char *, void *);
697 unsigned char addr_buf[4], netmask_buf[4];
699 if(dev->open != uml_net_open) return(NOTIFY_DONE);
706 proc = lp->add_address;
709 proc = lp->delete_address;
713 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
714 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
715 (*proc)(addr_buf, netmask_buf, &lp->user);
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 list_for_each(ele, &opened){
739 lp = list_entry(ele, struct uml_net_private, list);
740 ip = lp->dev->ip_ptr;
741 if(ip == NULL) continue;
744 uml_inetaddr_event(NULL, NETDEV_UP, in);
752 __initcall(uml_net_init);
754 static void close_devices(void)
756 struct list_head *ele;
757 struct uml_net_private *lp;
759 list_for_each(ele, &opened){
760 lp = list_entry(ele, struct uml_net_private, list);
761 free_irq(lp->dev->irq, lp->dev);
762 if((lp->close != NULL) && (lp->fd >= 0))
763 (*lp->close)(lp->fd, &lp->user);
764 if(lp->remove != NULL) (*lp->remove)(&lp->user);
768 __uml_exitcall(close_devices);
770 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
772 if((skb != NULL) && (skb_tailroom(skb) < extra)){
773 struct sk_buff *skb2;
775 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
779 if(skb != NULL) skb_put(skb, extra);
783 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
787 struct net_device *dev = d;
788 struct in_device *ip = dev->ip_ptr;
789 struct in_ifaddr *in;
790 unsigned char address[4], netmask[4];
792 if(ip == NULL) return;
795 memcpy(address, &in->ifa_address, sizeof(address));
796 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
797 (*cb)(address, netmask, arg);
802 int dev_netmask(void *d, void *m)
804 struct net_device *dev = d;
805 struct in_device *ip = dev->ip_ptr;
806 struct in_ifaddr *in;
807 __be32 *mask_out = m;
816 *mask_out = in->ifa_mask;
820 void *get_output_buffer(int *len_out)
824 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
825 if(ret) *len_out = PAGE_SIZE;
830 void free_output_buffer(void *buffer)
832 free_pages((unsigned long) buffer, 0);
835 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
840 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
842 printk("tap_setup_common - Extra garbage on specification : "
850 unsigned short eth_protocol(struct sk_buff *skb)
852 return(eth_type_trans(skb, skb->dev));
856 * Overrides for Emacs so that we follow Linus's tabbing style.
857 * Emacs will notice this stuff at the end of the file and automatically
858 * adjust the settings for this buffer only. This must remain at the end
860 * ---------------------------------------------------------------------------
862 * c-file-style: "linux"