1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
28 #define DRIVER_NAME "uml-netdev"
56 	err = -ENOMEM;  in update_drop_skb()
80 	skb = dev_alloc_skb(lp->max_packet);  in uml_net_rx()
82 		drop_skb->dev = dev;  in uml_net_rx()
84 		(*lp->read)(lp->fd, drop_skb, lp);  in uml_net_rx()
85 		dev->stats.rx_dropped++;  in uml_net_rx()
89 	skb->dev = dev;  in uml_net_rx()
90 	skb_put(skb, lp->max_packet);  in uml_net_rx()
92 	pkt_len = (*lp->read)(lp->fd, skb, lp);  in uml_net_rx()
96 		skb->protocol = (*lp->protocol)(skb);  in uml_net_rx()
98 		dev->stats.rx_bytes += skb->len;  in uml_net_rx()
99 		dev->stats.rx_packets++;  in uml_net_rx()
112 	dev_close(lp->dev);  in uml_dev_close()
124 	spin_lock(&lp->lock);  in uml_net_interrupt()
129 		       dev->name, err);  in uml_net_interrupt()
131 		 * again lp->lock.  in uml_net_interrupt()
133 		 * same device, since it tests for (dev->flags & IFF_UP). So  in uml_net_interrupt()
135 		 * Furthermore, the workqueue will not re-enqueue an already  in uml_net_interrupt()
137 		schedule_work(&lp->work);  in uml_net_interrupt()
141 	spin_unlock(&lp->lock);  in uml_net_interrupt()
150 	if (lp->fd >= 0) {  in uml_net_open()
151 		err = -ENXIO;  in uml_net_open()
155 	lp->fd = (*lp->open)(&lp->user);  in uml_net_open()
156 	if (lp->fd < 0) {  in uml_net_open()
157 		err = lp->fd;  in uml_net_open()
161 	err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,  in uml_net_open()
162 			     IRQF_SHARED, dev->name, dev);  in uml_net_open()
165 		err = -ENETUNREACH;  in uml_net_open()
171 	/* clear buffer - it can happen that the host side of the interface  in uml_net_open()
178 	list_add(&lp->list, &opened);  in uml_net_open()
183 	if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);  in uml_net_open()
184 	lp->fd = -1;  in uml_net_open()
195 	um_free_irq(dev->irq, dev);  in uml_net_close()
196 	if (lp->close != NULL)  in uml_net_close()
197 		(*lp->close)(lp->fd, &lp->user);  in uml_net_close()
198 	lp->fd = -1;  in uml_net_close()
201 	list_del(&lp->list);  in uml_net_close()
215 	spin_lock_irqsave(&lp->lock, flags);  in uml_net_start_xmit()
217 	len = (*lp->write)(lp->fd, skb, lp);  in uml_net_start_xmit()
220 	if (len == skb->len) {  in uml_net_start_xmit()
221 		dev->stats.tx_packets++;  in uml_net_start_xmit()
222 		dev->stats.tx_bytes += skb->len;  in uml_net_start_xmit()
231 		dev->stats.tx_dropped++;  in uml_net_start_xmit()
238 	spin_unlock_irqrestore(&lp->lock, flags);  in uml_net_start_xmit()
259 	disable_irq(dev->irq);  in uml_net_poll_controller()
260 	uml_net_interrupt(dev->irq, dev);  in uml_net_poll_controller()
261 	enable_irq(dev->irq);  in uml_net_poll_controller()
268 	strscpy(info->driver, DRIVER_NAME);  in uml_net_get_drvinfo()
314 		       "the first byte of the MAC,\n");  in uml_net_setup_etheraddr()
324 	       "Choosing a random ethernet address for device %s\n", dev->name);  in uml_net_setup_etheraddr()
340 	struct net_device *netdev = device->dev;  in net_device_release()
343 	if (lp->remove != NULL)  in net_device_release()
344 		(*lp->remove)(&lp->user);  in net_device_release()
345 	list_del(&device->list);  in net_device_release()
369 static void eth_configure(int n, void *init, char *mac,  in eth_configure()  argument
377 	size = transport->private_size + sizeof(struct uml_net_private);  in eth_configure()
389 		       "net_device for eth%d\n", n);  in eth_configure()
393 	INIT_LIST_HEAD(&device->list);  in eth_configure()
394 	device->index = n;  in eth_configure()
400 	snprintf(dev->name, sizeof(dev->name), "eth%d", n);  in eth_configure()
402 	uml_net_setup_etheraddr(dev, mac);  in eth_configure()
404 	printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);  in eth_configure()
410 	INIT_WORK(&lp->work, uml_dev_close);  in eth_configure()
417 	device->pdev.id = n;  in eth_configure()
418 	device->pdev.name = DRIVER_NAME;  in eth_configure()
419 	device->pdev.dev.release = net_device_release;  in eth_configure()
420 	dev_set_drvdata(&device->pdev.dev, device);  in eth_configure()
421 	if (platform_device_register(&device->pdev))  in eth_configure()
423 	SET_NETDEV_DEV(dev,&device->pdev.dev);  in eth_configure()
425 	device->dev = dev;  in eth_configure()
431 	(*transport->kern->init)(dev, init);  in eth_configure()
434 		{ .list  		= LIST_HEAD_INIT(lp->list),  in eth_configure()
436 		  .fd 			= -1,  in eth_configure()
437 		  .mac 			= { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},  in eth_configure()
438 		  .max_packet		= transport->user->max_packet,  in eth_configure()
439 		  .protocol 		= transport->kern->protocol,  in eth_configure()
440 		  .open 		= transport->user->open,  in eth_configure()
441 		  .close 		= transport->user->close,  in eth_configure()
442 		  .remove 		= transport->user->remove,  in eth_configure()
443 		  .read 		= transport->kern->read,  in eth_configure()
444 		  .write 		= transport->kern->write,  in eth_configure()
445 		  .add_address 		= transport->user->add_address,  in eth_configure()
446 		  .delete_address  	= transport->user->delete_address });  in eth_configure()
448 	spin_lock_init(&lp->lock);  in eth_configure()
449 	memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));  in eth_configure()
451 	if ((transport->user->init != NULL) &&  in eth_configure()
452 	    ((*transport->user->init)(&lp->user, dev) != 0))  in eth_configure()
455 	dev->mtu = transport->user->mtu;  in eth_configure()
456 	dev->netdev_ops = &uml_netdev_ops;  in eth_configure()
457 	dev->ethtool_ops = &uml_net_ethtool_ops;  in eth_configure()
458 	dev->watchdog_timeo = (HZ >> 1);  in eth_configure()
459 	dev->irq = UM_ETH_IRQ;  in eth_configure()
461 	err = update_drop_skb(lp->max_packet);  in eth_configure()
472 	list_add(&device->list, &devices);  in eth_configure()
478 	if (transport->user->remove != NULL)  in eth_configure()
479 		(*transport->user->remove)(&lp->user);  in eth_configure()
481 	platform_device_unregister(&device->pdev);  in eth_configure()
497 		if (device->index == n)  in find_device()
510 	int n, err = -EINVAL;  in eth_parse()
547 static int check_transport(struct transport *transport, char *eth, int n,  in check_transport()  argument
552 	len = strlen(transport->name);  in check_transport()
553 	if (strncmp(eth, transport->name, len))  in check_transport()
556 	eth += len;  in check_transport()
557 	if (*eth == ',')  in check_transport()
558 		eth++;  in check_transport()
559 	else if (*eth != '\0')  in check_transport()
562 	*init_out = kmalloc(transport->setup_size, gfp_mask);  in check_transport()
566 	if (!transport->setup(eth, mac_out, *init_out)) {  in check_transport()
576 	struct eth_init *eth;  in register_transport()  local
578 	char *mac = NULL;  in register_transport()  local
582 	BUG_ON(!list_empty(&new->list));  in register_transport()
583 	list_add(&new->list, &transports);  in register_transport()
587 		eth = list_entry(ele, struct eth_init, list);  in register_transport()
588 		match = check_transport(new, eth->init, eth->index, &init,  in register_transport()
589 					&mac, GFP_KERNEL);  in register_transport()
593 			eth_configure(eth->index, init, mac, new, GFP_KERNEL);  in register_transport()
596 		list_del(&eth->list);  in register_transport()
605 	char *mac = NULL;  in eth_setup_common()  local
612 					&mac, GFP_ATOMIC))  in eth_setup_common()
615 			eth_configure(index, init, mac, transport, GFP_ATOMIC);  in eth_setup_common()
634 		printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",  in eth_setup()
644 	INIT_LIST_HEAD(&new->list);  in eth_setup()
645 	new->index = n;  in eth_setup()
646 	new->init = str;  in eth_setup()
648 	list_add_tail(&new->list, &eth_cmd_line);  in eth_setup()
652 __setup("eth", eth_setup);
654 "eth[0-9]+=<transport>,<options>\n"
672 		return -ENOMEM;  in net_config()
687 		return -1;  in net_id()
703 		return -ENODEV;  in net_remove()
705 	dev = device->dev;  in net_remove()
707 	if (lp->fd > 0)  in net_remove()
708 		return -EBUSY;  in net_remove()
710 	platform_device_unregister(&device->pdev);  in net_remove()
717 	.name		= "eth",
729 	struct net_device *dev = ifa->ifa_dev->dev;  in uml_inetaddr_event()
734 	if (dev->netdev_ops->ndo_open != uml_net_open)  in uml_inetaddr_event()
742 		proc = lp->add_address;  in uml_inetaddr_event()
745 		proc = lp->delete_address;  in uml_inetaddr_event()
749 		memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));  in uml_inetaddr_event()
750 		memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));  in uml_inetaddr_event()
751 		(*proc)(addr_buf, netmask_buf, &lp->user);  in uml_inetaddr_event()
777 		ip = lp->dev->ip_ptr;  in inet_register()
780 		in = ip->ifa_list;  in inet_register()
783 			in = in->ifa_next;  in inet_register()
811 		um_free_irq(lp->dev->irq, lp->dev);  in close_devices()
812 		if ((lp->close != NULL) && (lp->fd >= 0))  in close_devices()
813 			(*lp->close)(lp->fd, &lp->user);  in close_devices()
814 		if (lp->remove != NULL)  in close_devices()
815 			(*lp->remove)(&lp->user);  in close_devices()
827 	struct in_device *ip = dev->ip_ptr;  in iter_addresses()
832 	in = ip->ifa_list;  in iter_addresses()
834 		memcpy(address, &in->ifa_address, sizeof(address));  in iter_addresses()
835 		memcpy(netmask, &in->ifa_mask, sizeof(netmask));  in iter_addresses()
837 		in = in->ifa_next;  in iter_addresses()
844 	struct in_device *ip = dev->ip_ptr;  in dev_netmask()
851 	in = ip->ifa_list;  in dev_netmask()
855 	*mask_out = in->ifa_mask;  in dev_netmask()
881 		printk(KERN_ERR "tap_setup_common - Extra garbage on "  in tap_setup_common()
891 	return eth_type_trans(skb, skb->dev);  in eth_protocol()