Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 465 insertions, 0 deletions

diff --git a/drivers/net/wan/lapbether.c b/drivers/net/wan/lapbether.c
new file mode 100644
index 000000000000..7f2e3653c5e5
--- /dev/null
+++ b/drivers/net/wan/lapbether.c
@@ -0,0 +1,465 @@
+/*
+ *      "LAPB via ethernet" driver release 001
+ *
+ *      This code REQUIRES 2.1.15 or higher/ NET3.038
+ *
+ *      This module:
+ *              This module 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 is a "pseudo" network driver to allow LAPB over Ethernet.
+ *
+ *      This driver can use any ethernet destination address, and can be 
+ *      limited to accept frames from one dedicated ethernet card only.
+ *
+ *      History
+ *      LAPBETH 001     Jonathan Naylor         Cloned from bpqether.c
+ *      2000-10-29      Henner Eisen    lapb_data_indication() return status.
+ *      2000-11-14      Henner Eisen    dev_hold/put, NETDEV_GOING_DOWN support
+ */
+
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/net.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/stat.h>
+#include <linux/netfilter.h>
+#include <linux/module.h>
+#include <linux/lapb.h>
+#include <linux/init.h>
+
+#include <net/x25device.h>
+
+static char bcast_addr[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
+
+/* If this number is made larger, check that the temporary string buffer
+ * in lapbeth_new_device is large enough to store the probe device name.*/
+#define MAXLAPBDEV 100
+
+struct lapbethdev {
+        struct list_head        node;
+        struct net_device       *ethdev;        /* link to ethernet device */
+        struct net_device       *axdev;         /* lapbeth device (lapb#) */
+        struct net_device_stats stats;          /* some statistics */
+};
+
+static struct list_head lapbeth_devices = LIST_HEAD_INIT(lapbeth_devices);
+
+/* ------------------------------------------------------------------------ */
+
+/*
+ *      Get the LAPB device for the ethernet device
+ */
+static struct lapbethdev *lapbeth_get_x25_dev(struct net_device *dev)
+{
+        struct lapbethdev *lapbeth;
+
+        list_for_each_entry_rcu(lapbeth, &lapbeth_devices, node) {
+                if (lapbeth->ethdev == dev) 
+                        return lapbeth;
+        }
+        return NULL;
+}
+
+static __inline__ int dev_is_ethdev(struct net_device *dev)
+{
+        return dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5);
+}
+
+/* ------------------------------------------------------------------------ */
+
+/*
+ *      Receive a LAPB frame via an ethernet interface.
+ */
+static int lapbeth_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype)
+{
+        int len, err;
+        struct lapbethdev *lapbeth;
+
+        if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
+                return NET_RX_DROP;
+
+        if (!pskb_may_pull(skb, 2))
+                goto drop;
+
+        rcu_read_lock();
+        lapbeth = lapbeth_get_x25_dev(dev);
+        if (!lapbeth)
+                goto drop_unlock;
+        if (!netif_running(lapbeth->axdev))
+                goto drop_unlock;
+
+        lapbeth->stats.rx_packets++;
+
+        len = skb->data[0] + skb->data[1] * 256;
+        lapbeth->stats.rx_bytes += len;
+
+        skb_pull(skb, 2);       /* Remove the length bytes */
+        skb_trim(skb, len);     /* Set the length of the data */
+
+        if ((err = lapb_data_received(lapbeth->axdev, skb)) != LAPB_OK) {
+                printk(KERN_DEBUG "lapbether: lapb_data_received err - %d\n", err);
+                goto drop_unlock;
+        }
+out:
+        rcu_read_unlock();
+        return 0;
+drop_unlock:
+        kfree_skb(skb);
+        goto out;
+drop:
+        kfree_skb(skb);
+        return 0;
+}
+
+static int lapbeth_data_indication(struct net_device *dev, struct sk_buff *skb)
+{
+        unsigned char *ptr;
+
+        skb_push(skb, 1);
+
+        if (skb_cow(skb, 1))
+                return NET_RX_DROP;
+
+        ptr  = skb->data;
+        *ptr = 0x00;
+
+        skb->protocol = x25_type_trans(skb, dev);
+        skb->dev->last_rx = jiffies;
+        return netif_rx(skb);
+}
+
+/*
+ *      Send a LAPB frame via an ethernet interface
+ */
+static int lapbeth_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+        int err = -ENODEV;
+
+        /*
+         * Just to be *really* sure not to send anything if the interface
+         * is down, the ethernet device may have gone.
+         */
+        if (!netif_running(dev)) {
+                goto drop;
+        }
+
+        switch (skb->data[0]) {
+        case 0x00:
+                err = 0;
+                break;
+        case 0x01:
+                if ((err = lapb_connect_request(dev)) != LAPB_OK)
+                        printk(KERN_ERR "lapbeth: lapb_connect_request "
+                               "error: %d\n", err);
+                goto drop_ok;
+        case 0x02:
+                if ((err = lapb_disconnect_request(dev)) != LAPB_OK)
+                        printk(KERN_ERR "lapbeth: lapb_disconnect_request "
+                               "err: %d\n", err);
+                /* Fall thru */
+        default:
+                goto drop_ok;
+        }
+
+        skb_pull(skb, 1);
+
+        if ((err = lapb_data_request(dev, skb)) != LAPB_OK) {
+                printk(KERN_ERR "lapbeth: lapb_data_request error - %d\n", err);
+                err = -ENOMEM;
+                goto drop;
+        }
+        err = 0;
+out:
+        return err;
+drop_ok:
+        err = 0;
+drop:
+        kfree_skb(skb);
+        goto out;
+}
+
+static void lapbeth_data_transmit(struct net_device *ndev, struct sk_buff *skb)
+{
+        struct lapbethdev *lapbeth = netdev_priv(ndev);
+        unsigned char *ptr;
+        struct net_device *dev;
+        int size = skb->len;
+
+        skb->protocol = htons(ETH_P_X25);
+
+        ptr = skb_push(skb, 2);
+
+        *ptr++ = size % 256;
+        *ptr++ = size / 256;
+
+        lapbeth->stats.tx_packets++;
+        lapbeth->stats.tx_bytes += size;
+
+        skb->dev = dev = lapbeth->ethdev;
+
+        dev->hard_header(skb, dev, ETH_P_DEC, bcast_addr, NULL, 0);
+
+        dev_queue_xmit(skb);
+}
+
+static void lapbeth_connected(struct net_device *dev, int reason)
+{
+        unsigned char *ptr;
+        struct sk_buff *skb = dev_alloc_skb(1);
+
+        if (!skb) {
+                printk(KERN_ERR "lapbeth: out of memory\n");
+                return;
+        }
+
+        ptr  = skb_put(skb, 1);
+        *ptr = 0x01;
+
+        skb->protocol = x25_type_trans(skb, dev);
+        skb->dev->last_rx = jiffies;
+        netif_rx(skb);
+}
+
+static void lapbeth_disconnected(struct net_device *dev, int reason)
+{
+        unsigned char *ptr;
+        struct sk_buff *skb = dev_alloc_skb(1);
+
+        if (!skb) {
+                printk(KERN_ERR "lapbeth: out of memory\n");
+                return;
+        }
+
+        ptr  = skb_put(skb, 1);
+        *ptr = 0x02;
+
+        skb->protocol = x25_type_trans(skb, dev);
+        skb->dev->last_rx = jiffies;
+        netif_rx(skb);
+}
+
+/*
+ *      Statistics
+ */
+static struct net_device_stats *lapbeth_get_stats(struct net_device *dev)
+{
+        struct lapbethdev *lapbeth = netdev_priv(dev);
+        return &lapbeth->stats;
+}
+
+/*
+ *      Set AX.25 callsign
+ */
+static int lapbeth_set_mac_address(struct net_device *dev, void *addr)
+{
+        struct sockaddr *sa = addr;
+        memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+        return 0;
+}
+
+
+static struct lapb_register_struct lapbeth_callbacks = {
+        .connect_confirmation    = lapbeth_connected,
+        .connect_indication      = lapbeth_connected,
+        .disconnect_confirmation = lapbeth_disconnected,
+        .disconnect_indication   = lapbeth_disconnected,
+        .data_indication         = lapbeth_data_indication,
+        .data_transmit           = lapbeth_data_transmit,
+
+};
+
+/*
+ * open/close a device
+ */
+static int lapbeth_open(struct net_device *dev)
+{
+        int err;
+
+        if ((err = lapb_register(dev, &lapbeth_callbacks)) != LAPB_OK) {
+                printk(KERN_ERR "lapbeth: lapb_register error - %d\n", err);
+                return -ENODEV;
+        }
+
+        netif_start_queue(dev);
+        return 0;
+}
+
+static int lapbeth_close(struct net_device *dev)
+{
+        int err;
+
+        netif_stop_queue(dev);
+
+        if ((err = lapb_unregister(dev)) != LAPB_OK)
+                printk(KERN_ERR "lapbeth: lapb_unregister error - %d\n", err);
+
+        return 0;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static void lapbeth_setup(struct net_device *dev)
+{
+        dev->hard_start_xmit = lapbeth_xmit;
+        dev->open            = lapbeth_open;
+        dev->stop            = lapbeth_close;
+        dev->destructor      = free_netdev;
+        dev->set_mac_address = lapbeth_set_mac_address;
+        dev->get_stats       = lapbeth_get_stats;
+        dev->type            = ARPHRD_X25;
+        dev->hard_header_len = 3;
+        dev->mtu             = 1000;
+        dev->addr_len        = 0;
+        SET_MODULE_OWNER(dev);
+}
+
+/*
+ *      Setup a new device.
+ */
+static int lapbeth_new_device(struct net_device *dev)
+{
+        struct net_device *ndev;
+        struct lapbethdev *lapbeth;
+        int rc = -ENOMEM;
+
+        ASSERT_RTNL();
+
+        ndev = alloc_netdev(sizeof(*lapbeth), "lapb%d", 
+                           lapbeth_setup);
+        if (!ndev)
+                goto out;
+
+        lapbeth = netdev_priv(ndev);
+        lapbeth->axdev = ndev;
+
+        dev_hold(dev);
+        lapbeth->ethdev = dev;
+
+        rc = dev_alloc_name(ndev, ndev->name);
+        if (rc < 0) 
+                goto fail;
+
+        rc = -EIO;
+        if (register_netdevice(ndev))
+                goto fail;
+
+        list_add_rcu(&lapbeth->node, &lapbeth_devices);
+        rc = 0;
+out:
+        return rc;
+fail:
+        dev_put(dev);
+        free_netdev(ndev);
+        kfree(lapbeth);
+        goto out;
+}
+
+/*
+ *      Free a lapb network device.
+ */
+static void lapbeth_free_device(struct lapbethdev *lapbeth)
+{
+        dev_put(lapbeth->ethdev);
+        list_del_rcu(&lapbeth->node);
+        unregister_netdevice(lapbeth->axdev);
+}
+
+/*
+ *      Handle device status changes.
+ *
+ * Called from notifier with RTNL held.
+ */
+static int lapbeth_device_event(struct notifier_block *this,
+                                unsigned long event, void *ptr)
+{
+        struct lapbethdev *lapbeth;
+        struct net_device *dev = ptr;
+
+        if (!dev_is_ethdev(dev))
+                return NOTIFY_DONE;
+
+        switch (event) {
+        case NETDEV_UP:
+                /* New ethernet device -> new LAPB interface     */
+                if (lapbeth_get_x25_dev(dev) == NULL)
+                        lapbeth_new_device(dev);
+                break;
+        case NETDEV_DOWN:       
+                /* ethernet device closed -> close LAPB interface */
+                lapbeth = lapbeth_get_x25_dev(dev);
+                if (lapbeth) 
+                        dev_close(lapbeth->axdev);
+                break;
+        case NETDEV_UNREGISTER:
+                /* ethernet device disappears -> remove LAPB interface */
+                lapbeth = lapbeth_get_x25_dev(dev);
+                if (lapbeth)
+                        lapbeth_free_device(lapbeth);
+                break;
+        }
+
+        return NOTIFY_DONE;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static struct packet_type lapbeth_packet_type = {
+        .type = __constant_htons(ETH_P_DEC),
+        .func = lapbeth_rcv,
+};
+
+static struct notifier_block lapbeth_dev_notifier = {
+        .notifier_call = lapbeth_device_event,
+};
+
+static char banner[] __initdata = KERN_INFO "LAPB Ethernet driver version 0.02\n";
+
+static int __init lapbeth_init_driver(void)
+{
+        dev_add_pack(&lapbeth_packet_type);
+
+        register_netdevice_notifier(&lapbeth_dev_notifier);
+
+        printk(banner);
+
+        return 0;
+}
+module_init(lapbeth_init_driver);
+
+static void __exit lapbeth_cleanup_driver(void)
+{
+        struct lapbethdev *lapbeth;
+        struct list_head *entry, *tmp;
+
+        dev_remove_pack(&lapbeth_packet_type);
+        unregister_netdevice_notifier(&lapbeth_dev_notifier);
+
+        rtnl_lock();
+        list_for_each_safe(entry, tmp, &lapbeth_devices) {
+                lapbeth = list_entry(entry, struct lapbethdev, node);
+
+                unregister_netdevice(lapbeth->axdev);
+        }
+        rtnl_unlock();
+}
+module_exit(lapbeth_cleanup_driver);
+
+MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
+MODULE_DESCRIPTION("The unofficial LAPB over Ethernet driver");
+MODULE_LICENSE("GPL");