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-rw-r--r--arch/um/drivers/net_kern.c892
1 files changed, 892 insertions, 0 deletions
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
new file mode 100644
index 0000000000..3d7836c465
--- /dev/null
+++ b/arch/um/drivers/net_kern.c
@@ -0,0 +1,892 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ */
+
+#include <linux/memblock.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/inetdevice.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/platform_device.h>
+#include <linux/rtnetlink.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <init.h>
+#include <irq_kern.h>
+#include <irq_user.h>
+#include "mconsole_kern.h"
+#include <net_kern.h>
+#include <net_user.h>
+
+#define DRIVER_NAME "uml-netdev"
+
+static DEFINE_SPINLOCK(opened_lock);
+static LIST_HEAD(opened);
+
+/*
+ * The drop_skb is used when we can't allocate an skb. The
+ * packet is read into drop_skb in order to get the data off the
+ * connection to the host.
+ * It is reallocated whenever a maximum packet size is seen which is
+ * larger than any seen before. update_drop_skb is called from
+ * eth_configure when a new interface is added.
+ */
+static DEFINE_SPINLOCK(drop_lock);
+static struct sk_buff *drop_skb;
+static int drop_max;
+
+static int update_drop_skb(int max)
+{
+ struct sk_buff *new;
+ unsigned long flags;
+ int err = 0;
+
+ spin_lock_irqsave(&drop_lock, flags);
+
+ if (max <= drop_max)
+ goto out;
+
+ err = -ENOMEM;
+ new = dev_alloc_skb(max);
+ if (new == NULL)
+ goto out;
+
+ skb_put(new, max);
+
+ kfree_skb(drop_skb);
+ drop_skb = new;
+ drop_max = max;
+ err = 0;
+out:
+ spin_unlock_irqrestore(&drop_lock, flags);
+
+ return err;
+}
+
+static int uml_net_rx(struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+ int pkt_len;
+ struct sk_buff *skb;
+
+ /* If we can't allocate memory, try again next round. */
+ skb = dev_alloc_skb(lp->max_packet);
+ if (skb == NULL) {
+ drop_skb->dev = dev;
+ /* Read a packet into drop_skb and don't do anything with it. */
+ (*lp->read)(lp->fd, drop_skb, lp);
+ dev->stats.rx_dropped++;
+ return 0;
+ }
+
+ skb->dev = dev;
+ skb_put(skb, lp->max_packet);
+ skb_reset_mac_header(skb);
+ pkt_len = (*lp->read)(lp->fd, skb, lp);
+
+ if (pkt_len > 0) {
+ skb_trim(skb, pkt_len);
+ skb->protocol = (*lp->protocol)(skb);
+
+ dev->stats.rx_bytes += skb->len;
+ dev->stats.rx_packets++;
+ netif_rx(skb);
+ return pkt_len;
+ }
+
+ kfree_skb(skb);
+ return pkt_len;
+}
+
+static void uml_dev_close(struct work_struct *work)
+{
+ struct uml_net_private *lp =
+ container_of(work, struct uml_net_private, work);
+ dev_close(lp->dev);
+}
+
+static irqreturn_t uml_net_interrupt(int irq, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct uml_net_private *lp = netdev_priv(dev);
+ int err;
+
+ if (!netif_running(dev))
+ return IRQ_NONE;
+
+ spin_lock(&lp->lock);
+ while ((err = uml_net_rx(dev)) > 0) ;
+ if (err < 0) {
+ printk(KERN_ERR
+ "Device '%s' read returned %d, shutting it down\n",
+ dev->name, err);
+ /* dev_close can't be called in interrupt context, and takes
+ * again lp->lock.
+ * And dev_close() can be safely called multiple times on the
+ * same device, since it tests for (dev->flags & IFF_UP). So
+ * there's no harm in delaying the device shutdown.
+ * Furthermore, the workqueue will not re-enqueue an already
+ * enqueued work item. */
+ schedule_work(&lp->work);
+ goto out;
+ }
+out:
+ spin_unlock(&lp->lock);
+ return IRQ_HANDLED;
+}
+
+static int uml_net_open(struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+ int err;
+
+ if (lp->fd >= 0) {
+ err = -ENXIO;
+ goto out;
+ }
+
+ lp->fd = (*lp->open)(&lp->user);
+ if (lp->fd < 0) {
+ err = lp->fd;
+ goto out;
+ }
+
+ err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
+ IRQF_SHARED, dev->name, dev);
+ if (err < 0) {
+ printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
+ err = -ENETUNREACH;
+ goto out_close;
+ }
+
+ netif_start_queue(dev);
+
+ /* clear buffer - it can happen that the host side of the interface
+ * is full when we get here. In this case, new data is never queued,
+ * SIGIOs never arrive, and the net never works.
+ */
+ while ((err = uml_net_rx(dev)) > 0) ;
+
+ spin_lock(&opened_lock);
+ list_add(&lp->list, &opened);
+ spin_unlock(&opened_lock);
+
+ return 0;
+out_close:
+ if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
+ lp->fd = -1;
+out:
+ return err;
+}
+
+static int uml_net_close(struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+
+ netif_stop_queue(dev);
+
+ um_free_irq(dev->irq, dev);
+ if (lp->close != NULL)
+ (*lp->close)(lp->fd, &lp->user);
+ lp->fd = -1;
+
+ spin_lock(&opened_lock);
+ list_del(&lp->list);
+ spin_unlock(&opened_lock);
+
+ return 0;
+}
+
+static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct uml_net_private *lp = netdev_priv(dev);
+ unsigned long flags;
+ int len;
+
+ netif_stop_queue(dev);
+
+ spin_lock_irqsave(&lp->lock, flags);
+
+ len = (*lp->write)(lp->fd, skb, lp);
+ skb_tx_timestamp(skb);
+
+ if (len == skb->len) {
+ dev->stats.tx_packets++;
+ dev->stats.tx_bytes += skb->len;
+ netif_trans_update(dev);
+ netif_start_queue(dev);
+
+ /* this is normally done in the interrupt when tx finishes */
+ netif_wake_queue(dev);
+ }
+ else if (len == 0) {
+ netif_start_queue(dev);
+ dev->stats.tx_dropped++;
+ }
+ else {
+ netif_start_queue(dev);
+ printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
+ }
+
+ spin_unlock_irqrestore(&lp->lock, flags);
+
+ dev_consume_skb_any(skb);
+
+ return NETDEV_TX_OK;
+}
+
+static void uml_net_set_multicast_list(struct net_device *dev)
+{
+ return;
+}
+
+static void uml_net_tx_timeout(struct net_device *dev, unsigned int txqueue)
+{
+ netif_trans_update(dev);
+ netif_wake_queue(dev);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void uml_net_poll_controller(struct net_device *dev)
+{
+ disable_irq(dev->irq);
+ uml_net_interrupt(dev->irq, dev);
+ enable_irq(dev->irq);
+}
+#endif
+
+static void uml_net_get_drvinfo(struct net_device *dev,
+ struct ethtool_drvinfo *info)
+{
+ strscpy(info->driver, DRIVER_NAME, sizeof(info->driver));
+}
+
+static const struct ethtool_ops uml_net_ethtool_ops = {
+ .get_drvinfo = uml_net_get_drvinfo,
+ .get_link = ethtool_op_get_link,
+ .get_ts_info = ethtool_op_get_ts_info,
+};
+
+void uml_net_setup_etheraddr(struct net_device *dev, char *str)
+{
+ u8 addr[ETH_ALEN];
+ char *end;
+ int i;
+
+ if (str == NULL)
+ goto random;
+
+ for (i = 0; i < 6; i++) {
+ addr[i] = simple_strtoul(str, &end, 16);
+ if ((end == str) ||
+ ((*end != ':') && (*end != ',') && (*end != '\0'))) {
+ printk(KERN_ERR
+ "setup_etheraddr: failed to parse '%s' "
+ "as an ethernet address\n", str);
+ goto random;
+ }
+ str = end + 1;
+ }
+ if (is_multicast_ether_addr(addr)) {
+ printk(KERN_ERR
+ "Attempt to assign a multicast ethernet address to a "
+ "device disallowed\n");
+ goto random;
+ }
+ if (!is_valid_ether_addr(addr)) {
+ printk(KERN_ERR
+ "Attempt to assign an invalid ethernet address to a "
+ "device disallowed\n");
+ goto random;
+ }
+ if (!is_local_ether_addr(addr)) {
+ printk(KERN_WARNING
+ "Warning: Assigning a globally valid ethernet "
+ "address to a device\n");
+ printk(KERN_WARNING "You should set the 2nd rightmost bit in "
+ "the first byte of the MAC,\n");
+ printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
+ addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
+ addr[5]);
+ }
+ eth_hw_addr_set(dev, addr);
+ return;
+
+random:
+ printk(KERN_INFO
+ "Choosing a random ethernet address for device %s\n", dev->name);
+ eth_hw_addr_random(dev);
+}
+
+static DEFINE_SPINLOCK(devices_lock);
+static LIST_HEAD(devices);
+
+static struct platform_driver uml_net_driver = {
+ .driver = {
+ .name = DRIVER_NAME,
+ },
+};
+
+static void net_device_release(struct device *dev)
+{
+ struct uml_net *device = dev_get_drvdata(dev);
+ struct net_device *netdev = device->dev;
+ struct uml_net_private *lp = netdev_priv(netdev);
+
+ if (lp->remove != NULL)
+ (*lp->remove)(&lp->user);
+ list_del(&device->list);
+ kfree(device);
+ free_netdev(netdev);
+}
+
+static const struct net_device_ops uml_netdev_ops = {
+ .ndo_open = uml_net_open,
+ .ndo_stop = uml_net_close,
+ .ndo_start_xmit = uml_net_start_xmit,
+ .ndo_set_rx_mode = uml_net_set_multicast_list,
+ .ndo_tx_timeout = uml_net_tx_timeout,
+ .ndo_set_mac_address = eth_mac_addr,
+ .ndo_validate_addr = eth_validate_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ .ndo_poll_controller = uml_net_poll_controller,
+#endif
+};
+
+/*
+ * Ensures that platform_driver_register is called only once by
+ * eth_configure. Will be set in an initcall.
+ */
+static int driver_registered;
+
+static void eth_configure(int n, void *init, char *mac,
+ struct transport *transport, gfp_t gfp_mask)
+{
+ struct uml_net *device;
+ struct net_device *dev;
+ struct uml_net_private *lp;
+ int err, size;
+
+ size = transport->private_size + sizeof(struct uml_net_private);
+
+ device = kzalloc(sizeof(*device), gfp_mask);
+ if (device == NULL) {
+ printk(KERN_ERR "eth_configure failed to allocate struct "
+ "uml_net\n");
+ return;
+ }
+
+ dev = alloc_etherdev(size);
+ if (dev == NULL) {
+ printk(KERN_ERR "eth_configure: failed to allocate struct "
+ "net_device for eth%d\n", n);
+ goto out_free_device;
+ }
+
+ INIT_LIST_HEAD(&device->list);
+ device->index = n;
+
+ /* If this name ends up conflicting with an existing registered
+ * netdevice, that is OK, register_netdev{,ice}() will notice this
+ * and fail.
+ */
+ snprintf(dev->name, sizeof(dev->name), "eth%d", n);
+
+ uml_net_setup_etheraddr(dev, mac);
+
+ printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr);
+
+ lp = netdev_priv(dev);
+ /* This points to the transport private data. It's still clear, but we
+ * must memset it to 0 *now*. Let's help the drivers. */
+ memset(lp, 0, size);
+ INIT_WORK(&lp->work, uml_dev_close);
+
+ /* sysfs register */
+ if (!driver_registered) {
+ platform_driver_register(&uml_net_driver);
+ driver_registered = 1;
+ }
+ device->pdev.id = n;
+ device->pdev.name = DRIVER_NAME;
+ device->pdev.dev.release = net_device_release;
+ dev_set_drvdata(&device->pdev.dev, device);
+ if (platform_device_register(&device->pdev))
+ goto out_free_netdev;
+ SET_NETDEV_DEV(dev,&device->pdev.dev);
+
+ device->dev = dev;
+
+ /*
+ * These just fill in a data structure, so there's no failure
+ * to be worried about.
+ */
+ (*transport->kern->init)(dev, init);
+
+ *lp = ((struct uml_net_private)
+ { .list = LIST_HEAD_INIT(lp->list),
+ .dev = dev,
+ .fd = -1,
+ .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
+ .max_packet = transport->user->max_packet,
+ .protocol = transport->kern->protocol,
+ .open = transport->user->open,
+ .close = transport->user->close,
+ .remove = transport->user->remove,
+ .read = transport->kern->read,
+ .write = transport->kern->write,
+ .add_address = transport->user->add_address,
+ .delete_address = transport->user->delete_address });
+
+ spin_lock_init(&lp->lock);
+ memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac));
+
+ if ((transport->user->init != NULL) &&
+ ((*transport->user->init)(&lp->user, dev) != 0))
+ goto out_unregister;
+
+ dev->mtu = transport->user->mtu;
+ dev->netdev_ops = &uml_netdev_ops;
+ dev->ethtool_ops = &uml_net_ethtool_ops;
+ dev->watchdog_timeo = (HZ >> 1);
+ dev->irq = UM_ETH_IRQ;
+
+ err = update_drop_skb(lp->max_packet);
+ if (err)
+ goto out_undo_user_init;
+
+ rtnl_lock();
+ err = register_netdevice(dev);
+ rtnl_unlock();
+ if (err)
+ goto out_undo_user_init;
+
+ spin_lock(&devices_lock);
+ list_add(&device->list, &devices);
+ spin_unlock(&devices_lock);
+
+ return;
+
+out_undo_user_init:
+ if (transport->user->remove != NULL)
+ (*transport->user->remove)(&lp->user);
+out_unregister:
+ platform_device_unregister(&device->pdev);
+ return; /* platform_device_unregister frees dev and device */
+out_free_netdev:
+ free_netdev(dev);
+out_free_device:
+ kfree(device);
+}
+
+static struct uml_net *find_device(int n)
+{
+ struct uml_net *device;
+ struct list_head *ele;
+
+ spin_lock(&devices_lock);
+ list_for_each(ele, &devices) {
+ device = list_entry(ele, struct uml_net, list);
+ if (device->index == n)
+ goto out;
+ }
+ device = NULL;
+ out:
+ spin_unlock(&devices_lock);
+ return device;
+}
+
+static int eth_parse(char *str, int *index_out, char **str_out,
+ char **error_out)
+{
+ char *end;
+ int n, err = -EINVAL;
+
+ n = simple_strtoul(str, &end, 0);
+ if (end == str) {
+ *error_out = "Bad device number";
+ return err;
+ }
+
+ str = end;
+ if (*str != '=') {
+ *error_out = "Expected '=' after device number";
+ return err;
+ }
+
+ str++;
+ if (find_device(n)) {
+ *error_out = "Device already configured";
+ return err;
+ }
+
+ *index_out = n;
+ *str_out = str;
+ return 0;
+}
+
+struct eth_init {
+ struct list_head list;
+ char *init;
+ int index;
+};
+
+static DEFINE_SPINLOCK(transports_lock);
+static LIST_HEAD(transports);
+
+/* Filled in during early boot */
+static LIST_HEAD(eth_cmd_line);
+
+static int check_transport(struct transport *transport, char *eth, int n,
+ void **init_out, char **mac_out, gfp_t gfp_mask)
+{
+ int len;
+
+ len = strlen(transport->name);
+ if (strncmp(eth, transport->name, len))
+ return 0;
+
+ eth += len;
+ if (*eth == ',')
+ eth++;
+ else if (*eth != '\0')
+ return 0;
+
+ *init_out = kmalloc(transport->setup_size, gfp_mask);
+ if (*init_out == NULL)
+ return 1;
+
+ if (!transport->setup(eth, mac_out, *init_out)) {
+ kfree(*init_out);
+ *init_out = NULL;
+ }
+ return 1;
+}
+
+void register_transport(struct transport *new)
+{
+ struct list_head *ele, *next;
+ struct eth_init *eth;
+ void *init;
+ char *mac = NULL;
+ int match;
+
+ spin_lock(&transports_lock);
+ BUG_ON(!list_empty(&new->list));
+ list_add(&new->list, &transports);
+ spin_unlock(&transports_lock);
+
+ list_for_each_safe(ele, next, &eth_cmd_line) {
+ eth = list_entry(ele, struct eth_init, list);
+ match = check_transport(new, eth->init, eth->index, &init,
+ &mac, GFP_KERNEL);
+ if (!match)
+ continue;
+ else if (init != NULL) {
+ eth_configure(eth->index, init, mac, new, GFP_KERNEL);
+ kfree(init);
+ }
+ list_del(&eth->list);
+ }
+}
+
+static int eth_setup_common(char *str, int index)
+{
+ struct list_head *ele;
+ struct transport *transport;
+ void *init;
+ char *mac = NULL;
+ int found = 0;
+
+ spin_lock(&transports_lock);
+ list_for_each(ele, &transports) {
+ transport = list_entry(ele, struct transport, list);
+ if (!check_transport(transport, str, index, &init,
+ &mac, GFP_ATOMIC))
+ continue;
+ if (init != NULL) {
+ eth_configure(index, init, mac, transport, GFP_ATOMIC);
+ kfree(init);
+ }
+ found = 1;
+ break;
+ }
+
+ spin_unlock(&transports_lock);
+ return found;
+}
+
+static int __init eth_setup(char *str)
+{
+ struct eth_init *new;
+ char *error;
+ int n, err;
+
+ err = eth_parse(str, &n, &str, &error);
+ if (err) {
+ printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n",
+ str, error);
+ return 1;
+ }
+
+ new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES);
+ if (!new)
+ panic("%s: Failed to allocate %zu bytes\n", __func__,
+ sizeof(*new));
+
+ INIT_LIST_HEAD(&new->list);
+ new->index = n;
+ new->init = str;
+
+ list_add_tail(&new->list, &eth_cmd_line);
+ return 1;
+}
+
+__setup("eth", eth_setup);
+__uml_help(eth_setup,
+"eth[0-9]+=<transport>,<options>\n"
+" Configure a network device.\n\n"
+);
+
+static int net_config(char *str, char **error_out)
+{
+ int n, err;
+
+ err = eth_parse(str, &n, &str, error_out);
+ if (err)
+ return err;
+
+ /* This string is broken up and the pieces used by the underlying
+ * driver. So, it is freed only if eth_setup_common fails.
+ */
+ str = kstrdup(str, GFP_KERNEL);
+ if (str == NULL) {
+ *error_out = "net_config failed to strdup string";
+ return -ENOMEM;
+ }
+ err = !eth_setup_common(str, n);
+ if (err)
+ kfree(str);
+ return err;
+}
+
+static int net_id(char **str, int *start_out, int *end_out)
+{
+ char *end;
+ int n;
+
+ n = simple_strtoul(*str, &end, 0);
+ if ((*end != '\0') || (end == *str))
+ return -1;
+
+ *start_out = n;
+ *end_out = n;
+ *str = end;
+ return n;
+}
+
+static int net_remove(int n, char **error_out)
+{
+ struct uml_net *device;
+ struct net_device *dev;
+ struct uml_net_private *lp;
+
+ device = find_device(n);
+ if (device == NULL)
+ return -ENODEV;
+
+ dev = device->dev;
+ lp = netdev_priv(dev);
+ if (lp->fd > 0)
+ return -EBUSY;
+ unregister_netdev(dev);
+ platform_device_unregister(&device->pdev);
+
+ return 0;
+}
+
+static struct mc_device net_mc = {
+ .list = LIST_HEAD_INIT(net_mc.list),
+ .name = "eth",
+ .config = net_config,
+ .get_config = NULL,
+ .id = net_id,
+ .remove = net_remove,
+};
+
+#ifdef CONFIG_INET
+static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct in_ifaddr *ifa = ptr;
+ struct net_device *dev = ifa->ifa_dev->dev;
+ struct uml_net_private *lp;
+ void (*proc)(unsigned char *, unsigned char *, void *);
+ unsigned char addr_buf[4], netmask_buf[4];
+
+ if (dev->netdev_ops->ndo_open != uml_net_open)
+ return NOTIFY_DONE;
+
+ lp = netdev_priv(dev);
+
+ proc = NULL;
+ switch (event) {
+ case NETDEV_UP:
+ proc = lp->add_address;
+ break;
+ case NETDEV_DOWN:
+ proc = lp->delete_address;
+ break;
+ }
+ if (proc != NULL) {
+ memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf));
+ memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf));
+ (*proc)(addr_buf, netmask_buf, &lp->user);
+ }
+ return NOTIFY_DONE;
+}
+
+/* uml_net_init shouldn't be called twice on two CPUs at the same time */
+static struct notifier_block uml_inetaddr_notifier = {
+ .notifier_call = uml_inetaddr_event,
+};
+
+static void inet_register(void)
+{
+ struct list_head *ele;
+ struct uml_net_private *lp;
+ struct in_device *ip;
+ struct in_ifaddr *in;
+
+ register_inetaddr_notifier(&uml_inetaddr_notifier);
+
+ /* Devices may have been opened already, so the uml_inetaddr_notifier
+ * didn't get a chance to run for them. This fakes it so that
+ * addresses which have already been set up get handled properly.
+ */
+ spin_lock(&opened_lock);
+ list_for_each(ele, &opened) {
+ lp = list_entry(ele, struct uml_net_private, list);
+ ip = lp->dev->ip_ptr;
+ if (ip == NULL)
+ continue;
+ in = ip->ifa_list;
+ while (in != NULL) {
+ uml_inetaddr_event(NULL, NETDEV_UP, in);
+ in = in->ifa_next;
+ }
+ }
+ spin_unlock(&opened_lock);
+}
+#else
+static inline void inet_register(void)
+{
+}
+#endif
+
+static int uml_net_init(void)
+{
+ mconsole_register_dev(&net_mc);
+ inet_register();
+ return 0;
+}
+
+__initcall(uml_net_init);
+
+static void close_devices(void)
+{
+ struct list_head *ele;
+ struct uml_net_private *lp;
+
+ spin_lock(&opened_lock);
+ list_for_each(ele, &opened) {
+ lp = list_entry(ele, struct uml_net_private, list);
+ um_free_irq(lp->dev->irq, lp->dev);
+ if ((lp->close != NULL) && (lp->fd >= 0))
+ (*lp->close)(lp->fd, &lp->user);
+ if (lp->remove != NULL)
+ (*lp->remove)(&lp->user);
+ }
+ spin_unlock(&opened_lock);
+}
+
+__uml_exitcall(close_devices);
+
+void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *,
+ void *),
+ void *arg)
+{
+ struct net_device *dev = d;
+ struct in_device *ip = dev->ip_ptr;
+ struct in_ifaddr *in;
+ unsigned char address[4], netmask[4];
+
+ if (ip == NULL) return;
+ in = ip->ifa_list;
+ while (in != NULL) {
+ memcpy(address, &in->ifa_address, sizeof(address));
+ memcpy(netmask, &in->ifa_mask, sizeof(netmask));
+ (*cb)(address, netmask, arg);
+ in = in->ifa_next;
+ }
+}
+
+int dev_netmask(void *d, void *m)
+{
+ struct net_device *dev = d;
+ struct in_device *ip = dev->ip_ptr;
+ struct in_ifaddr *in;
+ __be32 *mask_out = m;
+
+ if (ip == NULL)
+ return 1;
+
+ in = ip->ifa_list;
+ if (in == NULL)
+ return 1;
+
+ *mask_out = in->ifa_mask;
+ return 0;
+}
+
+void *get_output_buffer(int *len_out)
+{
+ void *ret;
+
+ ret = (void *) __get_free_pages(GFP_KERNEL, 0);
+ if (ret) *len_out = PAGE_SIZE;
+ else *len_out = 0;
+ return ret;
+}
+
+void free_output_buffer(void *buffer)
+{
+ free_pages((unsigned long) buffer, 0);
+}
+
+int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out,
+ char **gate_addr)
+{
+ char *remain;
+
+ remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
+ if (remain != NULL) {
+ printk(KERN_ERR "tap_setup_common - Extra garbage on "
+ "specification : '%s'\n", remain);
+ return 1;
+ }
+
+ return 0;
+}
+
+unsigned short eth_protocol(struct sk_buff *skb)
+{
+ return eth_type_trans(skb, skb->dev);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 23:11:49 +0000