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/config.h"
9 #include "linux/kernel.h"
10 #include "linux/netdevice.h"
11 #include "linux/rtnetlink.h"
12 #include "linux/skbuff.h"
13 #include "linux/socket.h"
14 #include "linux/spinlock.h"
15 #include "linux/module.h"
16 #include "linux/init.h"
17 #include "linux/etherdevice.h"
18 #include "linux/list.h"
19 #include "linux/inetdevice.h"
20 #include "linux/ctype.h"
21 #include "linux/bootmem.h"
22 #include "linux/ethtool.h"
23 #include "linux/platform_device.h"
24 #include "asm/uaccess.h"
25 #include "user_util.h"
26 #include "kern_util.h"
29 #include "mconsole_kern.h"
34 #define DRIVER_NAME "uml-netdev"
36 static DEFINE_SPINLOCK(opened_lock);
39 static int uml_net_rx(struct net_device *dev)
41 struct uml_net_private *lp = dev->priv;
45 /* If we can't allocate memory, try again next round. */
46 skb = dev_alloc_skb(dev->mtu);
48 lp->stats.rx_dropped++;
53 skb_put(skb, dev->mtu);
54 skb->mac.raw = skb->data;
55 pkt_len = (*lp->read)(lp->fd, &skb, lp);
58 skb_trim(skb, pkt_len);
59 skb->protocol = (*lp->protocol)(skb);
62 lp->stats.rx_bytes += skb->len;
63 lp->stats.rx_packets++;
71 irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
73 struct net_device *dev = dev_id;
74 struct uml_net_private *lp = dev->priv;
77 if(!netif_running(dev))
81 while((err = uml_net_rx(dev)) > 0) ;
84 "Device '%s' read returned %d, shutting it down\n",
89 reactivate_fd(lp->fd, UM_ETH_IRQ);
92 spin_unlock(&lp->lock);
96 static int uml_net_open(struct net_device *dev)
98 struct uml_net_private *lp = dev->priv;
101 spin_lock(&lp->lock);
109 dev_ip_addr(dev, &lp->mac[2]);
110 set_ether_mac(dev, lp->mac);
113 lp->fd = (*lp->open)(&lp->user);
119 err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
120 SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
122 printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
123 if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
128 lp->tl.data = (unsigned long) &lp->user;
129 netif_start_queue(dev);
131 /* clear buffer - it can happen that the host side of the interface
132 * is full when we get here. In this case, new data is never queued,
133 * SIGIOs never arrive, and the net never works.
135 while((err = uml_net_rx(dev)) > 0) ;
138 spin_unlock(&lp->lock);
142 static int uml_net_close(struct net_device *dev)
144 struct uml_net_private *lp = dev->priv;
146 netif_stop_queue(dev);
147 spin_lock(&lp->lock);
149 free_irq(dev->irq, dev);
150 if(lp->close != NULL)
151 (*lp->close)(lp->fd, &lp->user);
154 spin_unlock(&lp->lock);
158 static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
160 struct uml_net_private *lp = dev->priv;
164 netif_stop_queue(dev);
166 spin_lock_irqsave(&lp->lock, flags);
168 len = (*lp->write)(lp->fd, &skb, lp);
170 if(len == skb->len) {
171 lp->stats.tx_packets++;
172 lp->stats.tx_bytes += skb->len;
173 dev->trans_start = jiffies;
174 netif_start_queue(dev);
176 /* this is normally done in the interrupt when tx finishes */
177 netif_wake_queue(dev);
180 netif_start_queue(dev);
181 lp->stats.tx_dropped++;
184 netif_start_queue(dev);
185 printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
188 spin_unlock_irqrestore(&lp->lock, flags);
195 static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
197 struct uml_net_private *lp = dev->priv;
201 static void uml_net_set_multicast_list(struct net_device *dev)
203 if (dev->flags & IFF_PROMISC) return;
204 else if (dev->mc_count) dev->flags |= IFF_ALLMULTI;
205 else dev->flags &= ~IFF_ALLMULTI;
208 static void uml_net_tx_timeout(struct net_device *dev)
210 dev->trans_start = jiffies;
211 netif_wake_queue(dev);
214 static int uml_net_set_mac(struct net_device *dev, void *addr)
216 struct uml_net_private *lp = dev->priv;
217 struct sockaddr *hwaddr = addr;
219 spin_lock(&lp->lock);
220 memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
221 spin_unlock(&lp->lock);
226 static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
228 struct uml_net_private *lp = dev->priv;
231 spin_lock(&lp->lock);
233 new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
242 spin_unlock(&lp->lock);
246 static void uml_net_get_drvinfo(struct net_device *dev,
247 struct ethtool_drvinfo *info)
249 strcpy(info->driver, DRIVER_NAME);
250 strcpy(info->version, "42");
253 static struct ethtool_ops uml_net_ethtool_ops = {
254 .get_drvinfo = uml_net_get_drvinfo,
255 .get_link = ethtool_op_get_link,
258 void uml_net_user_timer_expire(unsigned long _conn)
261 struct connection *conn = (struct connection *)_conn;
263 dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
268 static DEFINE_SPINLOCK(devices_lock);
269 static struct list_head devices = LIST_HEAD_INIT(devices);
271 static struct device_driver uml_net_driver = {
273 .bus = &platform_bus_type,
275 static int driver_registered;
277 static int eth_configure(int n, void *init, char *mac,
278 struct transport *transport)
280 struct uml_net *device;
281 struct net_device *dev;
282 struct uml_net_private *lp;
285 size = transport->private_size + sizeof(struct uml_net_private) +
286 sizeof(((struct uml_net_private *) 0)->user);
288 device = kmalloc(sizeof(*device), GFP_KERNEL);
289 if (device == NULL) {
290 printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
294 memset(device, 0, sizeof(*device));
295 INIT_LIST_HEAD(&device->list);
298 spin_lock(&devices_lock);
299 list_add(&device->list, &devices);
300 spin_unlock(&devices_lock);
302 if (setup_etheraddr(mac, device->mac))
303 device->have_mac = 1;
305 printk(KERN_INFO "Netdevice %d ", n);
306 if (device->have_mac)
307 printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
308 device->mac[0], device->mac[1],
309 device->mac[2], device->mac[3],
310 device->mac[4], device->mac[5]);
312 dev = alloc_etherdev(size);
314 printk(KERN_ERR "eth_configure: failed to allocate device\n");
319 if (!driver_registered) {
320 driver_register(¨_net_driver);
321 driver_registered = 1;
324 device->pdev.name = DRIVER_NAME;
325 platform_device_register(&device->pdev);
326 SET_NETDEV_DEV(dev,&device->pdev.dev);
328 /* If this name ends up conflicting with an existing registered
329 * netdevice, that is OK, register_netdev{,ice}() will notice this
332 snprintf(dev->name, sizeof(dev->name), "eth%d", n);
335 (*transport->kern->init)(dev, init);
337 dev->mtu = transport->user->max_packet;
338 dev->open = uml_net_open;
339 dev->hard_start_xmit = uml_net_start_xmit;
340 dev->stop = uml_net_close;
341 dev->get_stats = uml_net_get_stats;
342 dev->set_multicast_list = uml_net_set_multicast_list;
343 dev->tx_timeout = uml_net_tx_timeout;
344 dev->set_mac_address = uml_net_set_mac;
345 dev->change_mtu = uml_net_change_mtu;
346 dev->ethtool_ops = ¨_net_ethtool_ops;
347 dev->watchdog_timeo = (HZ >> 1);
348 dev->irq = UM_ETH_IRQ;
351 err = register_netdevice(dev);
355 /* XXX: should we call ->remove() here? */
361 /* lp.user is the first four bytes of the transport data, which
362 * has already been initialized. This structure assignment will
363 * overwrite that, so we make sure that .user gets overwritten with
364 * what it already has.
367 *lp = ((struct uml_net_private)
368 { .list = LIST_HEAD_INIT(lp->list),
371 .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
372 .have_mac = device->have_mac,
373 .protocol = transport->kern->protocol,
374 .open = transport->user->open,
375 .close = transport->user->close,
376 .remove = transport->user->remove,
377 .read = transport->kern->read,
378 .write = transport->kern->write,
379 .add_address = transport->user->add_address,
380 .delete_address = transport->user->delete_address,
381 .set_mtu = transport->user->set_mtu,
385 spin_lock_init(&lp->lock);
386 lp->tl.function = uml_net_user_timer_expire;
388 memcpy(lp->mac, device->mac, sizeof(lp->mac));
390 if (transport->user->init)
391 (*transport->user->init)(&lp->user, dev);
393 if (device->have_mac)
394 set_ether_mac(dev, device->mac);
396 spin_lock(&opened_lock);
397 list_add(&lp->list, &opened);
398 spin_unlock(&opened_lock);
403 static struct uml_net *find_device(int n)
405 struct uml_net *device;
406 struct list_head *ele;
408 spin_lock(&devices_lock);
409 list_for_each(ele, &devices){
410 device = list_entry(ele, struct uml_net, list);
411 if(device->index == n)
416 spin_unlock(&devices_lock);
420 static int eth_parse(char *str, int *index_out, char **str_out)
425 n = simple_strtoul(str, &end, 0);
427 printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
431 printk(KERN_ERR "eth_setup: device %d is negative\n", n);
437 "eth_setup: expected '=' after device number\n");
442 printk(KERN_ERR "eth_setup: Device %d already configured\n",
446 if(index_out) *index_out = n;
452 struct list_head list;
457 /* Filled in at boot time. Will need locking if the transports become
460 struct list_head transports = LIST_HEAD_INIT(transports);
462 /* Filled in during early boot */
463 struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
465 static int check_transport(struct transport *transport, char *eth, int n,
466 void **init_out, char **mac_out)
470 len = strlen(transport->name);
471 if(strncmp(eth, transport->name, len))
477 else if(*eth != '\0')
480 *init_out = kmalloc(transport->setup_size, GFP_KERNEL);
481 if(*init_out == NULL)
484 if(!transport->setup(eth, mac_out, *init_out)){
491 void register_transport(struct transport *new)
493 struct list_head *ele, *next;
494 struct eth_init *eth;
499 list_add(&new->list, &transports);
501 list_for_each_safe(ele, next, ð_cmd_line){
502 eth = list_entry(ele, struct eth_init, list);
503 match = check_transport(new, eth->init, eth->index, &init,
507 else if(init != NULL){
508 eth_configure(eth->index, init, mac, new);
511 list_del(ð->list);
515 static int eth_setup_common(char *str, int index)
517 struct list_head *ele;
518 struct transport *transport;
522 list_for_each(ele, &transports){
523 transport = list_entry(ele, struct transport, list);
524 if(!check_transport(transport, str, index, &init, &mac))
527 eth_configure(index, init, mac, transport);
535 static int eth_setup(char *str)
537 struct eth_init *new;
540 err = eth_parse(str, &n, &str);
543 new = alloc_bootmem(sizeof(new));
545 printk("eth_init : alloc_bootmem failed\n");
549 INIT_LIST_HEAD(&new->list);
553 list_add_tail(&new->list, ð_cmd_line);
557 __setup("eth", eth_setup);
558 __uml_help(eth_setup,
559 "eth[0-9]+=<transport>,<options>\n"
560 " Configure a network device.\n\n"
564 static int eth_init(void)
566 struct list_head *ele, *next;
567 struct eth_init *eth;
569 list_for_each_safe(ele, next, ð_cmd_line){
570 eth = list_entry(ele, struct eth_init, list);
572 if(eth_setup_common(eth->init, eth->index))
573 list_del(ð->list);
578 __initcall(eth_init);
581 static int net_config(char *str)
585 err = eth_parse(str, &n, &str);
588 str = uml_strdup(str);
590 printk(KERN_ERR "net_config failed to strdup string\n");
593 err = !eth_setup_common(str, n);
599 static int net_id(char **str, int *start_out, int *end_out)
604 n = simple_strtoul(*str, &end, 0);
605 if((*end != '\0') || (end == *str))
614 static int net_remove(int n)
616 struct uml_net *device;
617 struct net_device *dev;
618 struct uml_net_private *lp;
620 device = find_device(n);
628 if(lp->remove != NULL) (*lp->remove)(&lp->user);
629 unregister_netdev(dev);
630 platform_device_unregister(&device->pdev);
632 list_del(&device->list);
638 static struct mc_device net_mc = {
640 .config = net_config,
643 .remove = net_remove,
646 static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
649 struct in_ifaddr *ifa = ptr;
650 struct net_device *dev = ifa->ifa_dev->dev;
651 struct uml_net_private *lp;
652 void (*proc)(unsigned char *, unsigned char *, void *);
653 unsigned char addr_buf[4], netmask_buf[4];
655 if(dev->open != uml_net_open) return(NOTIFY_DONE);
662 proc = lp->add_address;
665 proc = lp->delete_address;
669 memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
670 memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
671 (*proc)(addr_buf, netmask_buf, &lp->user);
676 struct notifier_block uml_inetaddr_notifier = {
677 .notifier_call = uml_inetaddr_event,
680 static int uml_net_init(void)
682 struct list_head *ele;
683 struct uml_net_private *lp;
684 struct in_device *ip;
685 struct in_ifaddr *in;
687 mconsole_register_dev(&net_mc);
688 register_inetaddr_notifier(¨_inetaddr_notifier);
690 /* Devices may have been opened already, so the uml_inetaddr_notifier
691 * didn't get a chance to run for them. This fakes it so that
692 * addresses which have already been set up get handled properly.
694 list_for_each(ele, &opened){
695 lp = list_entry(ele, struct uml_net_private, list);
696 ip = lp->dev->ip_ptr;
697 if(ip == NULL) continue;
700 uml_inetaddr_event(NULL, NETDEV_UP, in);
708 __initcall(uml_net_init);
710 static void close_devices(void)
712 struct list_head *ele;
713 struct uml_net_private *lp;
715 list_for_each(ele, &opened){
716 lp = list_entry(ele, struct uml_net_private, list);
717 if((lp->close != NULL) && (lp->fd >= 0))
718 (*lp->close)(lp->fd, &lp->user);
719 if(lp->remove != NULL) (*lp->remove)(&lp->user);
723 __uml_exitcall(close_devices);
725 int setup_etheraddr(char *str, unsigned char *addr)
733 addr[i] = simple_strtoul(str, &end, 16);
735 ((*end != ':') && (*end != ',') && (*end != '\0'))){
737 "setup_etheraddr: failed to parse '%s' "
738 "as an ethernet address\n", str);
745 "Attempt to assign a broadcast ethernet address to a "
746 "device disallowed\n");
752 void dev_ip_addr(void *d, unsigned char *bin_buf)
754 struct net_device *dev = d;
755 struct in_device *ip = dev->ip_ptr;
756 struct in_ifaddr *in;
758 if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
759 printk(KERN_WARNING "dev_ip_addr - device not assigned an "
763 memcpy(bin_buf, &in->ifa_address, sizeof(in->ifa_address));
766 void set_ether_mac(void *d, unsigned char *addr)
768 struct net_device *dev = d;
770 memcpy(dev->dev_addr, addr, ETH_ALEN);
773 struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
775 if((skb != NULL) && (skb_tailroom(skb) < extra)){
776 struct sk_buff *skb2;
778 skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
782 if(skb != NULL) skb_put(skb, extra);
786 void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
790 struct net_device *dev = d;
791 struct in_device *ip = dev->ip_ptr;
792 struct in_ifaddr *in;
793 unsigned char address[4], netmask[4];
795 if(ip == NULL) return;
798 memcpy(address, &in->ifa_address, sizeof(address));
799 memcpy(netmask, &in->ifa_mask, sizeof(netmask));
800 (*cb)(address, netmask, arg);
805 int dev_netmask(void *d, void *m)
807 struct net_device *dev = d;
808 struct in_device *ip = dev->ip_ptr;
809 struct in_ifaddr *in;
819 *mask_out = in->ifa_mask;
823 void *get_output_buffer(int *len_out)
827 ret = (void *) __get_free_pages(GFP_KERNEL, 0);
828 if(ret) *len_out = PAGE_SIZE;
833 void free_output_buffer(void *buffer)
835 free_pages((unsigned long) buffer, 0);
838 int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
843 remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
845 printk("tap_setup_common - Extra garbage on specification : "
853 unsigned short eth_protocol(struct sk_buff *skb)
855 return(eth_type_trans(skb, skb->dev));
859 * Overrides for Emacs so that we follow Linus's tabbing style.
860 * Emacs will notice this stuff at the end of the file and automatically
861 * adjust the settings for this buffer only. This must remain at the end
863 * ---------------------------------------------------------------------------
865 * c-file-style: "linux"