1 files changed, 208 insertions, 0 deletions

diff --git a/net/ax25/ax25_dev.c b/net/ax25/ax25_dev.c
new file mode 100644
index 000000000000..dab77efe34a6
--- /dev/null
+++ b/net/ax25/ax25_dev.c
@@ -0,0 +1,208 @@
+/*
+ * 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.
+ *
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ */
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/spinlock.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+
+ax25_dev *ax25_dev_list;
+DEFINE_SPINLOCK(ax25_dev_lock);
+
+ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
+{
+        ax25_dev *ax25_dev, *res = NULL;
+
+        spin_lock_bh(&ax25_dev_lock);
+        for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
+                if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) {
+                        res = ax25_dev;
+                }
+        spin_unlock_bh(&ax25_dev_lock);
+
+        return res;
+}
+
+/*
+ *      This is called when an interface is brought up. These are
+ *      reasonable defaults.
+ */
+void ax25_dev_device_up(struct net_device *dev)
+{
+        ax25_dev *ax25_dev;
+
+        if ((ax25_dev = kmalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
+                printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
+                return;
+        }
+
+        ax25_unregister_sysctl();
+
+        memset(ax25_dev, 0x00, sizeof(*ax25_dev));
+
+        dev->ax25_ptr     = ax25_dev;
+        ax25_dev->dev     = dev;
+        dev_hold(dev);
+        ax25_dev->forward = NULL;
+
+        ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
+        ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
+        ax25_dev->values[AX25_VALUES_BACKOFF]   = AX25_DEF_BACKOFF;
+        ax25_dev->values[AX25_VALUES_CONMODE]   = AX25_DEF_CONMODE;
+        ax25_dev->values[AX25_VALUES_WINDOW]    = AX25_DEF_WINDOW;
+        ax25_dev->values[AX25_VALUES_EWINDOW]   = AX25_DEF_EWINDOW;
+        ax25_dev->values[AX25_VALUES_T1]        = AX25_DEF_T1;
+        ax25_dev->values[AX25_VALUES_T2]        = AX25_DEF_T2;
+        ax25_dev->values[AX25_VALUES_T3]        = AX25_DEF_T3;
+        ax25_dev->values[AX25_VALUES_IDLE]      = AX25_DEF_IDLE;
+        ax25_dev->values[AX25_VALUES_N2]        = AX25_DEF_N2;
+        ax25_dev->values[AX25_VALUES_PACLEN]    = AX25_DEF_PACLEN;
+        ax25_dev->values[AX25_VALUES_PROTOCOL]  = AX25_DEF_PROTOCOL;
+        ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
+
+#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
+        init_timer(&ax25_dev->dama.slave_timer);
+#endif
+
+        spin_lock_bh(&ax25_dev_lock);
+        ax25_dev->next = ax25_dev_list;
+        ax25_dev_list  = ax25_dev;
+        spin_unlock_bh(&ax25_dev_lock);
+
+        ax25_register_sysctl();
+}
+
+void ax25_dev_device_down(struct net_device *dev)
+{
+        ax25_dev *s, *ax25_dev;
+
+        if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
+                return;
+
+        ax25_unregister_sysctl();
+
+        spin_lock_bh(&ax25_dev_lock);
+
+#ifdef CONFIG_AX25_DAMA_SLAVE
+        ax25_ds_del_timer(ax25_dev);
+#endif
+
+        /*
+         *      Remove any packet forwarding that points to this device.
+         */
+        for (s = ax25_dev_list; s != NULL; s = s->next)
+                if (s->forward == dev)
+                        s->forward = NULL;
+
+        if ((s = ax25_dev_list) == ax25_dev) {
+                ax25_dev_list = s->next;
+                spin_unlock_bh(&ax25_dev_lock);
+                dev_put(dev);
+                kfree(ax25_dev);
+                ax25_register_sysctl();
+                return;
+        }
+
+        while (s != NULL && s->next != NULL) {
+                if (s->next == ax25_dev) {
+                        s->next = ax25_dev->next;
+                        spin_unlock_bh(&ax25_dev_lock);
+                        dev_put(dev);
+                        kfree(ax25_dev);
+                        ax25_register_sysctl();
+                        return;
+                }
+
+                s = s->next;
+        }
+        spin_unlock_bh(&ax25_dev_lock);
+        dev->ax25_ptr = NULL;
+
+        ax25_register_sysctl();
+}
+
+int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
+{
+        ax25_dev *ax25_dev, *fwd_dev;
+
+        if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
+                return -EINVAL;
+
+        switch (cmd) {
+        case SIOCAX25ADDFWD:
+                if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
+                        return -EINVAL;
+                if (ax25_dev->forward != NULL)
+                        return -EINVAL;
+                ax25_dev->forward = fwd_dev->dev;
+                break;
+
+        case SIOCAX25DELFWD:
+                if (ax25_dev->forward == NULL)
+                        return -EINVAL;
+                ax25_dev->forward = NULL;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+struct net_device *ax25_fwd_dev(struct net_device *dev)
+{
+        ax25_dev *ax25_dev;
+
+        if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
+                return dev;
+
+        if (ax25_dev->forward == NULL)
+                return dev;
+
+        return ax25_dev->forward;
+}
+
+/*
+ *      Free all memory associated with device structures.
+ */
+void __exit ax25_dev_free(void)
+{
+        ax25_dev *s, *ax25_dev;
+
+        spin_lock_bh(&ax25_dev_lock);
+        ax25_dev = ax25_dev_list;
+        while (ax25_dev != NULL) {
+                s        = ax25_dev;
+                dev_put(ax25_dev->dev);
+                ax25_dev = ax25_dev->next;
+                kfree(s);
+        }
+        ax25_dev_list = NULL;
+        spin_unlock_bh(&ax25_dev_lock);
+}