linux/net/ax25/ax25_dev.c
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   1/*
   2 * This program is free software; you can redistribute it and/or modify
   3 * it under the terms of the GNU General Public License as published by
   4 * the Free Software Foundation; either version 2 of the License, or
   5 * (at your option) any later version.
   6 *
   7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
   8 */
   9#include <linux/errno.h>
  10#include <linux/types.h>
  11#include <linux/socket.h>
  12#include <linux/slab.h>
  13#include <linux/in.h>
  14#include <linux/kernel.h>
  15#include <linux/timer.h>
  16#include <linux/string.h>
  17#include <linux/sockios.h>
  18#include <linux/net.h>
  19#include <linux/spinlock.h>
  20#include <net/ax25.h>
  21#include <linux/inet.h>
  22#include <linux/netdevice.h>
  23#include <linux/if_arp.h>
  24#include <linux/skbuff.h>
  25#include <net/sock.h>
  26#include <asm/uaccess.h>
  27#include <linux/fcntl.h>
  28#include <linux/mm.h>
  29#include <linux/interrupt.h>
  30#include <linux/init.h>
  31
  32ax25_dev *ax25_dev_list;
  33DEFINE_SPINLOCK(ax25_dev_lock);
  34
  35ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
  36{
  37        ax25_dev *ax25_dev, *res = NULL;
  38
  39        spin_lock_bh(&ax25_dev_lock);
  40        for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
  41                if (ax25cmp(addr, (ax25_address *)ax25_dev->dev->dev_addr) == 0) {
  42                        res = ax25_dev;
  43                }
  44        spin_unlock_bh(&ax25_dev_lock);
  45
  46        return res;
  47}
  48
  49/*
  50 *      This is called when an interface is brought up. These are
  51 *      reasonable defaults.
  52 */
  53void ax25_dev_device_up(struct net_device *dev)
  54{
  55        ax25_dev *ax25_dev;
  56
  57        if ((ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_ATOMIC)) == NULL) {
  58                printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
  59                return;
  60        }
  61
  62        dev->ax25_ptr     = ax25_dev;
  63        ax25_dev->dev     = dev;
  64        dev_hold(dev);
  65        ax25_dev->forward = NULL;
  66
  67        ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
  68        ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
  69        ax25_dev->values[AX25_VALUES_BACKOFF]   = AX25_DEF_BACKOFF;
  70        ax25_dev->values[AX25_VALUES_CONMODE]   = AX25_DEF_CONMODE;
  71        ax25_dev->values[AX25_VALUES_WINDOW]    = AX25_DEF_WINDOW;
  72        ax25_dev->values[AX25_VALUES_EWINDOW]   = AX25_DEF_EWINDOW;
  73        ax25_dev->values[AX25_VALUES_T1]        = AX25_DEF_T1;
  74        ax25_dev->values[AX25_VALUES_T2]        = AX25_DEF_T2;
  75        ax25_dev->values[AX25_VALUES_T3]        = AX25_DEF_T3;
  76        ax25_dev->values[AX25_VALUES_IDLE]      = AX25_DEF_IDLE;
  77        ax25_dev->values[AX25_VALUES_N2]        = AX25_DEF_N2;
  78        ax25_dev->values[AX25_VALUES_PACLEN]    = AX25_DEF_PACLEN;
  79        ax25_dev->values[AX25_VALUES_PROTOCOL]  = AX25_DEF_PROTOCOL;
  80        ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
  81
  82#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
  83        ax25_ds_setup_timer(ax25_dev);
  84#endif
  85
  86        spin_lock_bh(&ax25_dev_lock);
  87        ax25_dev->next = ax25_dev_list;
  88        ax25_dev_list  = ax25_dev;
  89        spin_unlock_bh(&ax25_dev_lock);
  90
  91        ax25_register_dev_sysctl(ax25_dev);
  92}
  93
  94void ax25_dev_device_down(struct net_device *dev)
  95{
  96        ax25_dev *s, *ax25_dev;
  97
  98        if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
  99                return;
 100
 101        ax25_unregister_dev_sysctl(ax25_dev);
 102
 103        spin_lock_bh(&ax25_dev_lock);
 104
 105#ifdef CONFIG_AX25_DAMA_SLAVE
 106        ax25_ds_del_timer(ax25_dev);
 107#endif
 108
 109        /*
 110         *      Remove any packet forwarding that points to this device.
 111         */
 112        for (s = ax25_dev_list; s != NULL; s = s->next)
 113                if (s->forward == dev)
 114                        s->forward = NULL;
 115
 116        if ((s = ax25_dev_list) == ax25_dev) {
 117                ax25_dev_list = s->next;
 118                spin_unlock_bh(&ax25_dev_lock);
 119                dev_put(dev);
 120                kfree(ax25_dev);
 121                return;
 122        }
 123
 124        while (s != NULL && s->next != NULL) {
 125                if (s->next == ax25_dev) {
 126                        s->next = ax25_dev->next;
 127                        spin_unlock_bh(&ax25_dev_lock);
 128                        dev_put(dev);
 129                        kfree(ax25_dev);
 130                        return;
 131                }
 132
 133                s = s->next;
 134        }
 135        spin_unlock_bh(&ax25_dev_lock);
 136        dev->ax25_ptr = NULL;
 137}
 138
 139int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
 140{
 141        ax25_dev *ax25_dev, *fwd_dev;
 142
 143        if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
 144                return -EINVAL;
 145
 146        switch (cmd) {
 147        case SIOCAX25ADDFWD:
 148                if ((fwd_dev = ax25_addr_ax25dev(&fwd->port_to)) == NULL)
 149                        return -EINVAL;
 150                if (ax25_dev->forward != NULL)
 151                        return -EINVAL;
 152                ax25_dev->forward = fwd_dev->dev;
 153                break;
 154
 155        case SIOCAX25DELFWD:
 156                if (ax25_dev->forward == NULL)
 157                        return -EINVAL;
 158                ax25_dev->forward = NULL;
 159                break;
 160
 161        default:
 162                return -EINVAL;
 163        }
 164
 165        return 0;
 166}
 167
 168struct net_device *ax25_fwd_dev(struct net_device *dev)
 169{
 170        ax25_dev *ax25_dev;
 171
 172        if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
 173                return dev;
 174
 175        if (ax25_dev->forward == NULL)
 176                return dev;
 177
 178        return ax25_dev->forward;
 179}
 180
 181/*
 182 *      Free all memory associated with device structures.
 183 */
 184void __exit ax25_dev_free(void)
 185{
 186        ax25_dev *s, *ax25_dev;
 187
 188        spin_lock_bh(&ax25_dev_lock);
 189        ax25_dev = ax25_dev_list;
 190        while (ax25_dev != NULL) {
 191                s        = ax25_dev;
 192                dev_put(ax25_dev->dev);
 193                ax25_dev = ax25_dev->next;
 194                kfree(s);
 195        }
 196        ax25_dev_list = NULL;
 197        spin_unlock_bh(&ax25_dev_lock);
 198}
 199
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