net/rose/rose_dev.c

   1 /*
   2  *      ROSE release 003
   3  *
   4  *      This code REQUIRES 2.1.15 or higher/ NET3.038
   5  *
   6  *      This module:
   7  *              This module is free software; you can redistribute it and/or
   8  *              modify it under the terms of the GNU General Public License
   9  *              as published by the Free Software Foundation; either version
  10  *              2 of the License, or (at your option) any later version.
  11  *
  12  *      History
  13  *      ROSE 001        Jonathan(G4KLX) Cloned from nr_dev.c.
  14  *                      Hans(PE1AYX)    Fixed interface to IP layer.
  15  */
  16
  17 #include <linux/config.h>
  18 #if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE)
  19 #define __NO_VERSION__
  20 #include <linux/module.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/kernel.h>
  23 #include <linux/sched.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/fs.h>
  26 #include <linux/types.h>
  27 #include <linux/sysctl.h>
  28 #include <linux/string.h>
  29 #include <linux/socket.h>
  30 #include <linux/errno.h>
  31 #include <linux/fcntl.h>
  32 #include <linux/in.h>
  33 #include <linux/if_ether.h>     /* For the statistics structure. */
  34
  35 #include <asm/system.h>
  36 #include <asm/segment.h>
  37 #include <asm/io.h>
  38
  39 #include <linux/inet.h>
  40 #include <linux/netdevice.h>
  41 #include <linux/etherdevice.h>
  42 #include <linux/if_arp.h>
  43 #include <linux/skbuff.h>
  44
  45 #include <net/ip.h>
  46 #include <net/arp.h>
  47
  48 #include <net/ax25.h>
  49 #include <net/rose.h>
  50
  51 /*
  52  *      Only allow IP over ROSE frames through if the netrom device is up.
  53  */
  54
  55 int rose_rx_ip(struct sk_buff *skb, struct device *dev)
  56 {
  57         struct net_device_stats *stats = (struct net_device_stats *)dev->priv;
  58
  59 #ifdef CONFIG_INET
  60         if (!dev->start) {
  61                 stats->rx_errors++;
  62                 return 0;
  63         }
  64
  65         stats->rx_packets++;
  66         stats->rx_bytes += skb->len;
  67
  68         skb->protocol = htons(ETH_P_IP);
  69
  70         /* Spoof incoming device */
  71         skb->dev      = dev;
  72         skb->h.raw    = skb->data;
  73         skb->nh.raw   = skb->data;
  74         skb->pkt_type = PACKET_HOST;
  75
  76         ip_rcv(skb, skb->dev, NULL);
  77 #else
  78         kfree_skb(skb);
  79 #endif
  80         return 1;
  81 }
  82
  83 static int rose_header(struct sk_buff *skb, struct device *dev, unsigned short type,
  84         void *daddr, void *saddr, unsigned len)
  85 {
  86         unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
  87
  88         *buff++ = ROSE_GFI | ROSE_Q_BIT;
  89         *buff++ = 0x00;
  90         *buff++ = ROSE_DATA;
  91         *buff++ = 0x7F;
  92         *buff++ = AX25_P_IP;
  93
  94         if (daddr != NULL)
  95                 return 37;
  96
  97         return -37;
  98 }
  99
 100 static int rose_rebuild_header(struct sk_buff *skb)
 101 {
 102         struct device *dev = skb->dev;
 103         struct net_device_stats *stats = (struct net_device_stats *)dev->priv;
 104         unsigned char *bp = (unsigned char *)skb->data;
 105         struct sk_buff *skbn;
 106
 107 #ifdef CONFIG_INET
 108         if (arp_find(bp + 7, skb)) {
 109                 return 1;
 110         }
 111
 112         if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
 113                 kfree_skb(skb);
 114                 return 1;
 115         }
 116
 117         if (skb->sk != NULL)
 118                 skb_set_owner_w(skbn, skb->sk);
 119
 120         kfree_skb(skb);
 121
 122         if (!rose_route_frame(skbn, NULL)) {
 123                 kfree_skb(skbn);
 124                 stats->tx_errors++;
 125         }
 126
 127         stats->tx_packets++;
 128         stats->tx_bytes += skbn->len;
 129 #endif
 130         return 1;
 131 }
 132
 133 static int rose_set_mac_address(struct device *dev, void *addr)
 134 {
 135         struct sockaddr *sa = addr;
 136
 137         rose_del_loopback_node((rose_address *)dev->dev_addr);
 138
 139         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 140
 141         rose_add_loopback_node((rose_address *)dev->dev_addr);
 142
 143         return 0;
 144 }
 145
 146 static int rose_open(struct device *dev)
 147 {
 148         dev->tbusy = 0;
 149         dev->start = 1;
 150
 151         MOD_INC_USE_COUNT;
 152
 153         rose_add_loopback_node((rose_address *)dev->dev_addr);
 154
 155         return 0;
 156 }
 157
 158 static int rose_close(struct device *dev)
 159 {
 160         dev->tbusy = 1;
 161         dev->start = 0;
 162
 163         MOD_DEC_USE_COUNT;
 164
 165         rose_del_loopback_node((rose_address *)dev->dev_addr);
 166
 167         return 0;
 168 }
 169
 170 static int rose_xmit(struct sk_buff *skb, struct device *dev)
 171 {
 172         struct net_device_stats *stats = (struct net_device_stats *)dev->priv;
 173
 174         if (skb == NULL || dev == NULL)
 175                 return 0;
 176
 177         if (!dev->start) {
 178                 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
 179                 return 1;
 180         }
 181
 182         cli();
 183
 184         if (dev->tbusy != 0) {
 185                 sti();
 186                 stats->tx_errors++;
 187                 return 1;
 188         }
 189
 190         dev->tbusy = 1;
 191
 192         sti();
 193
 194         kfree_skb(skb);
 195
 196         stats->tx_errors++;
 197
 198         dev->tbusy = 0;
 199
 200         mark_bh(NET_BH);
 201
 202         return 0;
 203 }
 204
 205 static struct net_device_stats *rose_get_stats(struct device *dev)
 206 {
 207         return (struct net_device_stats *)dev->priv;
 208 }
 209
 210 int rose_init(struct device *dev)
 211 {
 212         dev->mtu                = ROSE_MAX_PACKET_SIZE - 2;
 213         dev->tbusy              = 0;
 214         dev->hard_start_xmit    = rose_xmit;
 215         dev->open               = rose_open;
 216         dev->stop               = rose_close;
 217
 218         dev->hard_header        = rose_header;
 219         dev->hard_header_len    = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
 220         dev->addr_len           = ROSE_ADDR_LEN;
 221         dev->type               = ARPHRD_ROSE;
 222         dev->rebuild_header     = rose_rebuild_header;
 223         dev->set_mac_address    = rose_set_mac_address;
 224
 225         /* New-style flags. */
 226         dev->flags              = 0;
 227
 228         if ((dev->priv = kmalloc(sizeof(struct net_device_stats), GFP_KERNEL)) == NULL)
 229                 return -ENOMEM;
 230
 231         memset(dev->priv, 0, sizeof(struct net_device_stats));
 232
 233         dev->get_stats = rose_get_stats;
 234
 235         dev_init_buffers(dev);
 236
 237         return 0;
 238 };
 239
 240 #endif