From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/net/tun.c | 883 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 883 insertions(+) create mode 100644 drivers/net/tun.c (limited to 'drivers/net/tun.c') diff --git a/drivers/net/tun.c b/drivers/net/tun.c new file mode 100644 index 000000000000..7bfee366297b --- /dev/null +++ b/drivers/net/tun.c @@ -0,0 +1,883 @@ +/* + * TUN - Universal TUN/TAP device driver. + * Copyright (C) 1999-2002 Maxim Krasnyansky + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ + */ + +/* + * Changes: + * + * Mark Smith + * Use random_ether_addr() for tap MAC address. + * + * Harald Roelle 2004/04/20 + * Fixes in packet dropping, queue length setting and queue wakeup. + * Increased default tx queue length. + * Added ethtool API. + * Minor cleanups + * + * Daniel Podlejski + * Modifications for 2.3.99-pre5 kernel. + */ + +#define DRV_NAME "tun" +#define DRV_VERSION "1.6" +#define DRV_DESCRIPTION "Universal TUN/TAP device driver" +#define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky " + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#ifdef TUN_DEBUG +static int debug; +#endif + +/* Network device part of the driver */ + +static LIST_HEAD(tun_dev_list); +static struct ethtool_ops tun_ethtool_ops; + +/* Net device open. */ +static int tun_net_open(struct net_device *dev) +{ + netif_start_queue(dev); + return 0; +} + +/* Net device close. */ +static int tun_net_close(struct net_device *dev) +{ + netif_stop_queue(dev); + return 0; +} + +/* Net device start xmit */ +static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) +{ + struct tun_struct *tun = netdev_priv(dev); + + DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); + + /* Drop packet if interface is not attached */ + if (!tun->attached) + goto drop; + + /* Packet dropping */ + if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { + if (!(tun->flags & TUN_ONE_QUEUE)) { + /* Normal queueing mode. */ + /* Packet scheduler handles dropping of further packets. */ + netif_stop_queue(dev); + + /* We won't see all dropped packets individually, so overrun + * error is more appropriate. */ + tun->stats.tx_fifo_errors++; + } else { + /* Single queue mode. + * Driver handles dropping of all packets itself. */ + goto drop; + } + } + + /* Queue packet */ + skb_queue_tail(&tun->readq, skb); + dev->trans_start = jiffies; + + /* Notify and wake up reader process */ + if (tun->flags & TUN_FASYNC) + kill_fasync(&tun->fasync, SIGIO, POLL_IN); + wake_up_interruptible(&tun->read_wait); + return 0; + +drop: + tun->stats.tx_dropped++; + kfree_skb(skb); + return 0; +} + +/** Add the specified Ethernet address to this multicast filter. */ +static void +add_multi(u32* filter, const u8* addr) +{ + int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; + filter[bit_nr >> 5] |= 1 << (bit_nr & 31); +} + +/** Remove the specified Ethernet addres from this multicast filter. */ +static void +del_multi(u32* filter, const u8* addr) +{ + int bit_nr = ether_crc(ETH_ALEN, addr) >> 26; + filter[bit_nr >> 5] &= ~(1 << (bit_nr & 31)); +} + +/** Update the list of multicast groups to which the network device belongs. + * This list is used to filter packets being sent from the character device to + * the network device. */ +static void +tun_net_mclist(struct net_device *dev) +{ + struct tun_struct *tun = netdev_priv(dev); + const struct dev_mc_list *mclist; + int i; + DBG(KERN_DEBUG "%s: tun_net_mclist: mc_count %d\n", + dev->name, dev->mc_count); + memset(tun->chr_filter, 0, sizeof tun->chr_filter); + for (i = 0, mclist = dev->mc_list; i < dev->mc_count && mclist != NULL; + i++, mclist = mclist->next) { + add_multi(tun->net_filter, mclist->dmi_addr); + DBG(KERN_DEBUG "%s: tun_net_mclist: %x:%x:%x:%x:%x:%x\n", + dev->name, + mclist->dmi_addr[0], mclist->dmi_addr[1], mclist->dmi_addr[2], + mclist->dmi_addr[3], mclist->dmi_addr[4], mclist->dmi_addr[5]); + } +} + +static struct net_device_stats *tun_net_stats(struct net_device *dev) +{ + struct tun_struct *tun = netdev_priv(dev); + return &tun->stats; +} + +/* Initialize net device. */ +static void tun_net_init(struct net_device *dev) +{ + struct tun_struct *tun = netdev_priv(dev); + + switch (tun->flags & TUN_TYPE_MASK) { + case TUN_TUN_DEV: + /* Point-to-Point TUN Device */ + dev->hard_header_len = 0; + dev->addr_len = 0; + dev->mtu = 1500; + + /* Zero header length */ + dev->type = ARPHRD_NONE; + dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; + dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ + break; + + case TUN_TAP_DEV: + /* Ethernet TAP Device */ + dev->set_multicast_list = tun_net_mclist; + + ether_setup(dev); + random_ether_addr(dev->dev_addr); + dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ + break; + } +} + +/* Character device part */ + +/* Poll */ +static unsigned int tun_chr_poll(struct file *file, poll_table * wait) +{ + struct tun_struct *tun = file->private_data; + unsigned int mask = POLLOUT | POLLWRNORM; + + if (!tun) + return -EBADFD; + + DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); + + poll_wait(file, &tun->read_wait, wait); + + if (skb_queue_len(&tun->readq)) + mask |= POLLIN | POLLRDNORM; + + return mask; +} + +/* Get packet from user space buffer */ +static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) +{ + struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; + struct sk_buff *skb; + size_t len = count, align = 0; + + if (!(tun->flags & TUN_NO_PI)) { + if ((len -= sizeof(pi)) > count) + return -EINVAL; + + if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) + return -EFAULT; + } + + if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) + align = NET_IP_ALIGN; + + if (!(skb = alloc_skb(len + align, GFP_KERNEL))) { + tun->stats.rx_dropped++; + return -ENOMEM; + } + + if (align) + skb_reserve(skb, align); + if (memcpy_fromiovec(skb_put(skb, len), iv, len)) + return -EFAULT; + + skb->dev = tun->dev; + switch (tun->flags & TUN_TYPE_MASK) { + case TUN_TUN_DEV: + skb->mac.raw = skb->data; + skb->protocol = pi.proto; + break; + case TUN_TAP_DEV: + skb->protocol = eth_type_trans(skb, tun->dev); + break; + }; + + if (tun->flags & TUN_NOCHECKSUM) + skb->ip_summed = CHECKSUM_UNNECESSARY; + + netif_rx_ni(skb); + tun->dev->last_rx = jiffies; + + tun->stats.rx_packets++; + tun->stats.rx_bytes += len; + + return count; +} + +static inline size_t iov_total(const struct iovec *iv, unsigned long count) +{ + unsigned long i; + size_t len; + + for (i = 0, len = 0; i < count; i++) + len += iv[i].iov_len; + + return len; +} + +/* Writev */ +static ssize_t tun_chr_writev(struct file * file, const struct iovec *iv, + unsigned long count, loff_t *pos) +{ + struct tun_struct *tun = file->private_data; + + if (!tun) + return -EBADFD; + + DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); + + return tun_get_user(tun, (struct iovec *) iv, iov_total(iv, count)); +} + +/* Write */ +static ssize_t tun_chr_write(struct file * file, const char __user * buf, + size_t count, loff_t *pos) +{ + struct iovec iv = { (void __user *) buf, count }; + return tun_chr_writev(file, &iv, 1, pos); +} + +/* Put packet to the user space buffer */ +static __inline__ ssize_t tun_put_user(struct tun_struct *tun, + struct sk_buff *skb, + struct iovec *iv, int len) +{ + struct tun_pi pi = { 0, skb->protocol }; + ssize_t total = 0; + + if (!(tun->flags & TUN_NO_PI)) { + if ((len -= sizeof(pi)) < 0) + return -EINVAL; + + if (len < skb->len) { + /* Packet will be striped */ + pi.flags |= TUN_PKT_STRIP; + } + + if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) + return -EFAULT; + total += sizeof(pi); + } + + len = min_t(int, skb->len, len); + + skb_copy_datagram_iovec(skb, 0, iv, len); + total += len; + + tun->stats.tx_packets++; + tun->stats.tx_bytes += len; + + return total; +} + +/* Readv */ +static ssize_t tun_chr_readv(struct file *file, const struct iovec *iv, + unsigned long count, loff_t *pos) +{ + struct tun_struct *tun = file->private_data; + DECLARE_WAITQUEUE(wait, current); + struct sk_buff *skb; + ssize_t len, ret = 0; + + if (!tun) + return -EBADFD; + + DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); + + len = iov_total(iv, count); + if (len < 0) + return -EINVAL; + + add_wait_queue(&tun->read_wait, &wait); + while (len) { + const u8 ones[ ETH_ALEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; + u8 addr[ ETH_ALEN]; + int bit_nr; + + current->state = TASK_INTERRUPTIBLE; + + /* Read frames from the queue */ + if (!(skb=skb_dequeue(&tun->readq))) { + if (file->f_flags & O_NONBLOCK) { + ret = -EAGAIN; + break; + } + if (signal_pending(current)) { + ret = -ERESTARTSYS; + break; + } + + /* Nothing to read, let's sleep */ + schedule(); + continue; + } + netif_wake_queue(tun->dev); + + /** Decide whether to accept this packet. This code is designed to + * behave identically to an Ethernet interface. Accept the packet if + * - we are promiscuous. + * - the packet is addressed to us. + * - the packet is broadcast. + * - the packet is multicast and + * - we are multicast promiscous. + * - we belong to the multicast group. + */ + memcpy(addr, skb->data, + min_t(size_t, sizeof addr, skb->len)); + bit_nr = ether_crc(sizeof addr, addr) >> 26; + if ((tun->if_flags & IFF_PROMISC) || + memcmp(addr, tun->dev_addr, sizeof addr) == 0 || + memcmp(addr, ones, sizeof addr) == 0 || + (((addr[0] == 1 && addr[1] == 0 && addr[2] == 0x5e) || + (addr[0] == 0x33 && addr[1] == 0x33)) && + ((tun->if_flags & IFF_ALLMULTI) || + (tun->chr_filter[bit_nr >> 5] & (1 << (bit_nr & 31)))))) { + DBG(KERN_DEBUG "%s: tun_chr_readv: accepted: %x:%x:%x:%x:%x:%x\n", + tun->dev->name, addr[0], addr[1], addr[2], + addr[3], addr[4], addr[5]); + ret = tun_put_user(tun, skb, (struct iovec *) iv, len); + kfree_skb(skb); + break; + } else { + DBG(KERN_DEBUG "%s: tun_chr_readv: rejected: %x:%x:%x:%x:%x:%x\n", + tun->dev->name, addr[0], addr[1], addr[2], + addr[3], addr[4], addr[5]); + kfree_skb(skb); + continue; + } + } + + current->state = TASK_RUNNING; + remove_wait_queue(&tun->read_wait, &wait); + + return ret; +} + +/* Read */ +static ssize_t tun_chr_read(struct file * file, char __user * buf, + size_t count, loff_t *pos) +{ + struct iovec iv = { buf, count }; + return tun_chr_readv(file, &iv, 1, pos); +} + +static void tun_setup(struct net_device *dev) +{ + struct tun_struct *tun = netdev_priv(dev); + + skb_queue_head_init(&tun->readq); + init_waitqueue_head(&tun->read_wait); + + tun->owner = -1; + + SET_MODULE_OWNER(dev); + dev->open = tun_net_open; + dev->hard_start_xmit = tun_net_xmit; + dev->stop = tun_net_close; + dev->get_stats = tun_net_stats; + dev->ethtool_ops = &tun_ethtool_ops; + dev->destructor = free_netdev; +} + +static struct tun_struct *tun_get_by_name(const char *name) +{ + struct tun_struct *tun; + + ASSERT_RTNL(); + list_for_each_entry(tun, &tun_dev_list, list) { + if (!strncmp(tun->dev->name, name, IFNAMSIZ)) + return tun; + } + + return NULL; +} + +static int tun_set_iff(struct file *file, struct ifreq *ifr) +{ + struct tun_struct *tun; + struct net_device *dev; + int err; + + tun = tun_get_by_name(ifr->ifr_name); + if (tun) { + if (tun->attached) + return -EBUSY; + + /* Check permissions */ + if (tun->owner != -1 && + current->euid != tun->owner && !capable(CAP_NET_ADMIN)) + return -EPERM; + } + else if (__dev_get_by_name(ifr->ifr_name)) + return -EINVAL; + else { + char *name; + unsigned long flags = 0; + + err = -EINVAL; + + /* Set dev type */ + if (ifr->ifr_flags & IFF_TUN) { + /* TUN device */ + flags |= TUN_TUN_DEV; + name = "tun%d"; + } else if (ifr->ifr_flags & IFF_TAP) { + /* TAP device */ + flags |= TUN_TAP_DEV; + name = "tap%d"; + } else + goto failed; + + if (*ifr->ifr_name) + name = ifr->ifr_name; + + dev = alloc_netdev(sizeof(struct tun_struct), name, + tun_setup); + if (!dev) + return -ENOMEM; + + tun = netdev_priv(dev); + tun->dev = dev; + tun->flags = flags; + /* Be promiscuous by default to maintain previous behaviour. */ + tun->if_flags = IFF_PROMISC; + /* Generate random Ethernet address. */ + *(u16 *)tun->dev_addr = htons(0x00FF); + get_random_bytes(tun->dev_addr + sizeof(u16), 4); + memset(tun->chr_filter, 0, sizeof tun->chr_filter); + + tun_net_init(dev); + + if (strchr(dev->name, '%')) { + err = dev_alloc_name(dev, dev->name); + if (err < 0) + goto err_free_dev; + } + + err = register_netdevice(tun->dev); + if (err < 0) + goto err_free_dev; + + list_add(&tun->list, &tun_dev_list); + } + + DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); + + if (ifr->ifr_flags & IFF_NO_PI) + tun->flags |= TUN_NO_PI; + + if (ifr->ifr_flags & IFF_ONE_QUEUE) + tun->flags |= TUN_ONE_QUEUE; + + file->private_data = tun; + tun->attached = 1; + + strcpy(ifr->ifr_name, tun->dev->name); + return 0; + + err_free_dev: + free_netdev(dev); + failed: + return err; +} + +static int tun_chr_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct tun_struct *tun = file->private_data; + void __user* argp = (void __user*)arg; + struct ifreq ifr; + + if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) + if (copy_from_user(&ifr, argp, sizeof ifr)) + return -EFAULT; + + if (cmd == TUNSETIFF && !tun) { + int err; + + ifr.ifr_name[IFNAMSIZ-1] = '\0'; + + rtnl_lock(); + err = tun_set_iff(file, &ifr); + rtnl_unlock(); + + if (err) + return err; + + if (copy_to_user(argp, &ifr, sizeof(ifr))) + return -EFAULT; + return 0; + } + + if (!tun) + return -EBADFD; + + DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); + + switch (cmd) { + case TUNSETNOCSUM: + /* Disable/Enable checksum */ + if (arg) + tun->flags |= TUN_NOCHECKSUM; + else + tun->flags &= ~TUN_NOCHECKSUM; + + DBG(KERN_INFO "%s: checksum %s\n", + tun->dev->name, arg ? "disabled" : "enabled"); + break; + + case TUNSETPERSIST: + /* Disable/Enable persist mode */ + if (arg) + tun->flags |= TUN_PERSIST; + else + tun->flags &= ~TUN_PERSIST; + + DBG(KERN_INFO "%s: persist %s\n", + tun->dev->name, arg ? "disabled" : "enabled"); + break; + + case TUNSETOWNER: + /* Set owner of the device */ + tun->owner = (uid_t) arg; + + DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); + break; + +#ifdef TUN_DEBUG + case TUNSETDEBUG: + tun->debug = arg; + break; +#endif + + case SIOCGIFFLAGS: + ifr.ifr_flags = tun->if_flags; + if (copy_to_user( argp, &ifr, sizeof ifr)) + return -EFAULT; + return 0; + + case SIOCSIFFLAGS: + /** Set the character device's interface flags. Currently only + * IFF_PROMISC and IFF_ALLMULTI are used. */ + tun->if_flags = ifr.ifr_flags; + DBG(KERN_INFO "%s: interface flags 0x%lx\n", + tun->dev->name, tun->if_flags); + return 0; + + case SIOCGIFHWADDR: + memcpy(ifr.ifr_hwaddr.sa_data, tun->dev_addr, + min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); + if (copy_to_user( argp, &ifr, sizeof ifr)) + return -EFAULT; + return 0; + + case SIOCSIFHWADDR: + /** Set the character device's hardware address. This is used when + * filtering packets being sent from the network device to the character + * device. */ + memcpy(tun->dev_addr, ifr.ifr_hwaddr.sa_data, + min(sizeof ifr.ifr_hwaddr.sa_data, sizeof tun->dev_addr)); + DBG(KERN_DEBUG "%s: set hardware address: %x:%x:%x:%x:%x:%x\n", + tun->dev->name, + tun->dev_addr[0], tun->dev_addr[1], tun->dev_addr[2], + tun->dev_addr[3], tun->dev_addr[4], tun->dev_addr[5]); + return 0; + + case SIOCADDMULTI: + /** Add the specified group to the character device's multicast filter + * list. */ + add_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); + DBG(KERN_DEBUG "%s: add multi: %x:%x:%x:%x:%x:%x\n", + tun->dev->name, + (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], + (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], + (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); + return 0; + + case SIOCDELMULTI: + /** Remove the specified group from the character device's multicast + * filter list. */ + del_multi(tun->chr_filter, ifr.ifr_hwaddr.sa_data); + DBG(KERN_DEBUG "%s: del multi: %x:%x:%x:%x:%x:%x\n", + tun->dev->name, + (u8)ifr.ifr_hwaddr.sa_data[0], (u8)ifr.ifr_hwaddr.sa_data[1], + (u8)ifr.ifr_hwaddr.sa_data[2], (u8)ifr.ifr_hwaddr.sa_data[3], + (u8)ifr.ifr_hwaddr.sa_data[4], (u8)ifr.ifr_hwaddr.sa_data[5]); + return 0; + + default: + return -EINVAL; + }; + + return 0; +} + +static int tun_chr_fasync(int fd, struct file *file, int on) +{ + struct tun_struct *tun = file->private_data; + int ret; + + if (!tun) + return -EBADFD; + + DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); + + if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) + return ret; + + if (on) { + ret = f_setown(file, current->pid, 0); + if (ret) + return ret; + tun->flags |= TUN_FASYNC; + } else + tun->flags &= ~TUN_FASYNC; + + return 0; +} + +static int tun_chr_open(struct inode *inode, struct file * file) +{ + DBG1(KERN_INFO "tunX: tun_chr_open\n"); + file->private_data = NULL; + return 0; +} + +static int tun_chr_close(struct inode *inode, struct file *file) +{ + struct tun_struct *tun = file->private_data; + + if (!tun) + return 0; + + DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); + + tun_chr_fasync(-1, file, 0); + + rtnl_lock(); + + /* Detach from net device */ + file->private_data = NULL; + tun->attached = 0; + + /* Drop read queue */ + skb_queue_purge(&tun->readq); + + if (!(tun->flags & TUN_PERSIST)) { + list_del(&tun->list); + unregister_netdevice(tun->dev); + } + + rtnl_unlock(); + + return 0; +} + +static struct file_operations tun_fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .read = tun_chr_read, + .readv = tun_chr_readv, + .write = tun_chr_write, + .writev = tun_chr_writev, + .poll = tun_chr_poll, + .ioctl = tun_chr_ioctl, + .open = tun_chr_open, + .release = tun_chr_close, + .fasync = tun_chr_fasync +}; + +static struct miscdevice tun_miscdev = { + .minor = TUN_MINOR, + .name = "tun", + .fops = &tun_fops, + .devfs_name = "net/tun", +}; + +/* ethtool interface */ + +static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) +{ + cmd->supported = 0; + cmd->advertising = 0; + cmd->speed = SPEED_10; + cmd->duplex = DUPLEX_FULL; + cmd->port = PORT_TP; + cmd->phy_address = 0; + cmd->transceiver = XCVR_INTERNAL; + cmd->autoneg = AUTONEG_DISABLE; + cmd->maxtxpkt = 0; + cmd->maxrxpkt = 0; + return 0; +} + +static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) +{ + struct tun_struct *tun = netdev_priv(dev); + + strcpy(info->driver, DRV_NAME); + strcpy(info->version, DRV_VERSION); + strcpy(info->fw_version, "N/A"); + + switch (tun->flags & TUN_TYPE_MASK) { + case TUN_TUN_DEV: + strcpy(info->bus_info, "tun"); + break; + case TUN_TAP_DEV: + strcpy(info->bus_info, "tap"); + break; + } +} + +static u32 tun_get_msglevel(struct net_device *dev) +{ +#ifdef TUN_DEBUG + struct tun_struct *tun = netdev_priv(dev); + return tun->debug; +#else + return -EOPNOTSUPP; +#endif +} + +static void tun_set_msglevel(struct net_device *dev, u32 value) +{ +#ifdef TUN_DEBUG + struct tun_struct *tun = netdev_priv(dev); + tun->debug = value; +#endif +} + +static u32 tun_get_link(struct net_device *dev) +{ + struct tun_struct *tun = netdev_priv(dev); + return tun->attached; +} + +static u32 tun_get_rx_csum(struct net_device *dev) +{ + struct tun_struct *tun = netdev_priv(dev); + return (tun->flags & TUN_NOCHECKSUM) == 0; +} + +static int tun_set_rx_csum(struct net_device *dev, u32 data) +{ + struct tun_struct *tun = netdev_priv(dev); + if (data) + tun->flags &= ~TUN_NOCHECKSUM; + else + tun->flags |= TUN_NOCHECKSUM; + return 0; +} + +static struct ethtool_ops tun_ethtool_ops = { + .get_settings = tun_get_settings, + .get_drvinfo = tun_get_drvinfo, + .get_msglevel = tun_get_msglevel, + .set_msglevel = tun_set_msglevel, + .get_link = tun_get_link, + .get_rx_csum = tun_get_rx_csum, + .set_rx_csum = tun_set_rx_csum +}; + +static int __init tun_init(void) +{ + int ret = 0; + + printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); + printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); + + ret = misc_register(&tun_miscdev); + if (ret) + printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); + return ret; +} + +static void tun_cleanup(void) +{ + struct tun_struct *tun, *nxt; + + misc_deregister(&tun_miscdev); + + rtnl_lock(); + list_for_each_entry_safe(tun, nxt, &tun_dev_list, list) { + DBG(KERN_INFO "%s cleaned up\n", tun->dev->name); + unregister_netdevice(tun->dev); + } + rtnl_unlock(); + +} + +module_init(tun_init); +module_exit(tun_cleanup); +MODULE_DESCRIPTION(DRV_DESCRIPTION); +MODULE_AUTHOR(DRV_COPYRIGHT); +MODULE_LICENSE("GPL"); +MODULE_ALIAS_MISCDEV(TUN_MINOR); -- cgit v1.2.3-59-g8ed1b