diff options
Diffstat (limited to 'drivers/net/ethertap.c')
| -rw-r--r-- | drivers/net/ethertap.c | 390 |
1 files changed, 0 insertions, 390 deletions
diff --git a/drivers/net/ethertap.c b/drivers/net/ethertap.c deleted file mode 100644 index 34430ad63b6a..000000000000 --- a/drivers/net/ethertap.c +++ /dev/null @@ -1,390 +0,0 @@ -/* - * Ethertap: A network device for bouncing packets via user space - * - * This is a very simple ethernet driver. It bounces ethernet frames - * to user space on /dev/tap0->/dev/tap15 and expects ethernet frames - * to be written back to it. By default it does not ARP. If you turn ARP - * on it will attempt to ARP the user space and reply to ARPS from the - * user space. - * - * As this is an ethernet device you can use it for appletalk, IPX etc - * even for building bridging tunnels. - */ - -#include <linux/config.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/kernel.h> -#include <linux/jiffies.h> -#include <linux/slab.h> -#include <linux/string.h> -#include <linux/errno.h> - -#include <linux/netdevice.h> -#include <linux/inetdevice.h> -#include <linux/etherdevice.h> -#include <linux/skbuff.h> -#include <linux/init.h> - -#include <net/sock.h> -#include <linux/netlink.h> - -/* - * Index to functions. - */ - -static int ethertap_open(struct net_device *dev); -static int ethertap_start_xmit(struct sk_buff *skb, struct net_device *dev); -static int ethertap_close(struct net_device *dev); -static struct net_device_stats *ethertap_get_stats(struct net_device *dev); -static void ethertap_rx(struct sock *sk, int len); -#ifdef CONFIG_ETHERTAP_MC -static void set_multicast_list(struct net_device *dev); -#endif - -static int ethertap_debug; - -static int max_taps = 1; -module_param(max_taps, int, 0); -MODULE_PARM_DESC(max_taps,"Max number of ethernet tap devices"); - -static struct net_device **tap_map; /* Returns the tap device for a given netlink */ - -/* - * Board-specific info in dev->priv. - */ - -struct net_local -{ - struct sock *nl; -#ifdef CONFIG_ETHERTAP_MC - __u32 groups; -#endif - struct net_device_stats stats; -}; - -/* - * To call this a probe is a bit misleading, however for real - * hardware it would have to check what was present. - */ -static int __init ethertap_probe(int unit) -{ - struct net_device *dev; - int err = -ENOMEM; - - dev = alloc_etherdev(sizeof(struct net_local)); - - if (!dev) - goto out; - - SET_MODULE_OWNER(dev); - - sprintf(dev->name, "tap%d", unit); - dev->base_addr = unit + NETLINK_TAPBASE; - - netdev_boot_setup_check(dev); - - memcpy(dev->dev_addr, "\xFE\xFD\x00\x00\x00\x00", 6); - if (dev->mem_start & 0xf) - ethertap_debug = dev->mem_start & 0x7; - - /* - * The tap specific entries in the device structure. - */ - - dev->open = ethertap_open; - dev->hard_start_xmit = ethertap_start_xmit; - dev->stop = ethertap_close; - dev->get_stats = ethertap_get_stats; -#ifdef CONFIG_ETHERTAP_MC - dev->set_multicast_list = set_multicast_list; -#endif - - dev->tx_queue_len = 0; - dev->flags|=IFF_NOARP; - - err = register_netdev(dev); - if (err) - goto out_free; - - tap_map[unit]=dev; - return 0; -out_free: - free_netdev(dev); -out: - return err; -} - -/* - * Open/initialize the board. - */ - -static int ethertap_open(struct net_device *dev) -{ - struct net_local *lp = netdev_priv(dev); - - if (ethertap_debug > 2) - printk(KERN_DEBUG "%s: Doing ethertap_open()...\n", dev->name); - - lp->nl = netlink_kernel_create(dev->base_addr, ethertap_rx); - if (lp->nl == NULL) - return -ENOBUFS; - - netif_start_queue(dev); - return 0; -} - -#ifdef CONFIG_ETHERTAP_MC -static unsigned ethertap_mc_hash(__u8 *dest) -{ - unsigned idx = 0; - idx ^= dest[0]; - idx ^= dest[1]; - idx ^= dest[2]; - idx ^= dest[3]; - idx ^= dest[4]; - idx ^= dest[5]; - return 1U << (idx&0x1F); -} - -static void set_multicast_list(struct net_device *dev) -{ - unsigned groups = ~0; - struct net_local *lp = netdev_priv(dev); - - if (!(dev->flags&(IFF_NOARP|IFF_PROMISC|IFF_ALLMULTI))) { - struct dev_mc_list *dmi; - - groups = ethertap_mc_hash(dev->broadcast); - - for (dmi=dev->mc_list; dmi; dmi=dmi->next) { - if (dmi->dmi_addrlen != 6) - continue; - groups |= ethertap_mc_hash(dmi->dmi_addr); - } - } - lp->groups = groups; - if (lp->nl) - lp->nl->protinfo.af_netlink.groups = groups; -} -#endif - -/* - * We transmit by throwing the packet at netlink. We have to clone - * it for 2.0 so that we dev_kfree_skb() the locked original. - */ - -static int ethertap_start_xmit(struct sk_buff *skb, struct net_device *dev) -{ - struct net_local *lp = netdev_priv(dev); -#ifdef CONFIG_ETHERTAP_MC - struct ethhdr *eth = (struct ethhdr*)skb->data; -#endif - - if (skb_headroom(skb) < 2) { - static int once; - struct sk_buff *skb2; - - if (!once) { - once = 1; - printk(KERN_DEBUG "%s: not aligned xmit by protocol %04x\n", dev->name, skb->protocol); - } - - skb2 = skb_realloc_headroom(skb, 2); - dev_kfree_skb(skb); - if (skb2 == NULL) - return 0; - skb = skb2; - } - __skb_push(skb, 2); - - /* Make the same thing, which loopback does. */ - if (skb_shared(skb)) { - struct sk_buff *skb2 = skb; - skb = skb_clone(skb, GFP_ATOMIC); /* Clone the buffer */ - if (skb==NULL) { - dev_kfree_skb(skb2); - return 0; - } - dev_kfree_skb(skb2); - } - /* ... but do not orphan it here, netlink does it in any case. */ - - lp->stats.tx_bytes+=skb->len; - lp->stats.tx_packets++; - -#ifndef CONFIG_ETHERTAP_MC - netlink_broadcast(lp->nl, skb, 0, ~0, GFP_ATOMIC); -#else - if (dev->flags&IFF_NOARP) { - netlink_broadcast(lp->nl, skb, 0, ~0, GFP_ATOMIC); - return 0; - } - - if (!(eth->h_dest[0]&1)) { - /* Unicast packet */ - __u32 pid; - memcpy(&pid, eth->h_dest+2, 4); - netlink_unicast(lp->nl, skb, ntohl(pid), MSG_DONTWAIT); - } else - netlink_broadcast(lp->nl, skb, 0, ethertap_mc_hash(eth->h_dest), GFP_ATOMIC); -#endif - return 0; -} - -static __inline__ int ethertap_rx_skb(struct sk_buff *skb, struct net_device *dev) -{ - struct net_local *lp = netdev_priv(dev); -#ifdef CONFIG_ETHERTAP_MC - struct ethhdr *eth = (struct ethhdr*)(skb->data + 2); -#endif - int len = skb->len; - - if (len < 16) { - printk(KERN_DEBUG "%s : rx len = %d\n", dev->name, len); - kfree_skb(skb); - return -EINVAL; - } - if (NETLINK_CREDS(skb)->uid) { - printk(KERN_INFO "%s : user %d\n", dev->name, NETLINK_CREDS(skb)->uid); - kfree_skb(skb); - return -EPERM; - } - -#ifdef CONFIG_ETHERTAP_MC - if (!(dev->flags&(IFF_NOARP|IFF_PROMISC))) { - int drop = 0; - - if (eth->h_dest[0]&1) { - if (!(ethertap_mc_hash(eth->h_dest)&lp->groups)) - drop = 1; - } else if (memcmp(eth->h_dest, dev->dev_addr, 6) != 0) - drop = 1; - - if (drop) { - if (ethertap_debug > 3) - printk(KERN_DEBUG "%s : not for us\n", dev->name); - kfree_skb(skb); - return -EINVAL; - } - } -#endif - - if (skb_shared(skb)) { - struct sk_buff *skb2 = skb; - skb = skb_clone(skb, GFP_KERNEL); /* Clone the buffer */ - if (skb==NULL) { - kfree_skb(skb2); - return -ENOBUFS; - } - kfree_skb(skb2); - } else - skb_orphan(skb); - - skb_pull(skb, 2); - skb->dev = dev; - skb->protocol=eth_type_trans(skb,dev); - memset(skb->cb, 0, sizeof(skb->cb)); - lp->stats.rx_packets++; - lp->stats.rx_bytes+=len; - netif_rx(skb); - dev->last_rx = jiffies; - return len; -} - -/* - * The typical workload of the driver: - * Handle the ether interface interrupts. - * - * (In this case handle the packets posted from user space..) - */ - -static void ethertap_rx(struct sock *sk, int len) -{ - unsigned unit = sk->sk_protocol - NETLINK_TAPBASE; - struct net_device *dev; - struct sk_buff *skb; - - if (unit >= max_taps || (dev = tap_map[unit]) == NULL) { - printk(KERN_CRIT "ethertap: bad unit %u!\n", unit); - skb_queue_purge(&sk->sk_receive_queue); - return; - } - - if (ethertap_debug > 3) - printk(KERN_DEBUG "%s: ethertap_rx()\n", dev->name); - - while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) - ethertap_rx_skb(skb, dev); -} - -static int ethertap_close(struct net_device *dev) -{ - struct net_local *lp = netdev_priv(dev); - struct sock *sk = lp->nl; - - if (ethertap_debug > 2) - printk(KERN_DEBUG "%s: Shutting down.\n", dev->name); - - netif_stop_queue(dev); - - if (sk) { - lp->nl = NULL; - sock_release(sk->sk_socket); - } - - return 0; -} - -static struct net_device_stats *ethertap_get_stats(struct net_device *dev) -{ - struct net_local *lp = netdev_priv(dev); - return &lp->stats; -} - - -static int __init ethertap_init(void) -{ - int i, err = 0; - - /* netlink can only hande 16 entries unless modified */ - if (max_taps > MAX_LINKS - NETLINK_TAPBASE) - return -E2BIG; - - tap_map = kmalloc(sizeof(struct net_device *)*max_taps, GFP_KERNEL); - if (!tap_map) - return -ENOMEM; - - for (i = 0; i < max_taps; i++) { - err = ethertap_probe(i); - if (err) { - while (--i > 0) { - unregister_netdev(tap_map[i]); - free_netdev(tap_map[i]); - } - break; - } - } - if (err) - kfree(tap_map); - return err; -} -module_init(ethertap_init); - -static void __exit ethertap_cleanup(void) -{ - int i; - - for (i = 0; i < max_taps; i++) { - struct net_device *dev = tap_map[i]; - if (dev) { - tap_map[i] = NULL; - unregister_netdev(dev); - free_netdev(dev); - } - } - kfree(tap_map); -} -module_exit(ethertap_cleanup); - -MODULE_LICENSE("GPL"); |