net/rose/rose_dev.c

   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/config.h>
  10 #include <linux/module.h>
  11 #include <linux/proc_fs.h>
  12 #include <linux/kernel.h>
  13 #include <linux/sched.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/fs.h>
  16 #include <linux/types.h>
  17 #include <linux/sysctl.h>
  18 #include <linux/string.h>
  19 #include <linux/socket.h>
  20 #include <linux/errno.h>
  21 #include <linux/fcntl.h>
  22 #include <linux/in.h>
  23 #include <linux/if_ether.h>
  24
  25 #include <asm/system.h>
  26 #include <asm/io.h>
  27
  28 #include <linux/inet.h>
  29 #include <linux/netdevice.h>
  30 #include <linux/etherdevice.h>
  31 #include <linux/if_arp.h>
  32 #include <linux/skbuff.h>
  33
  34 #include <net/ip.h>
  35 #include <net/arp.h>
  36
  37 #include <net/ax25.h>
  38 #include <net/rose.h>
  39
  40 static int rose_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
  41         void *daddr, void *saddr, unsigned len)
  42 {
  43         unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);
  44
  45         *buff++ = ROSE_GFI | ROSE_Q_BIT;
  46         *buff++ = 0x00;
  47         *buff++ = ROSE_DATA;
  48         *buff++ = 0x7F;
  49         *buff++ = AX25_P_IP;
  50
  51         if (daddr != NULL)
  52                 return 37;
  53
  54         return -37;
  55 }
  56
  57 static int rose_rebuild_header(struct sk_buff *skb)
  58 {
  59         struct net_device *dev = skb->dev;
  60         struct net_device_stats *stats = netdev_priv(dev);
  61         unsigned char *bp = (unsigned char *)skb->data;
  62         struct sk_buff *skbn;
  63
  64 #ifdef CONFIG_INET
  65         if (arp_find(bp + 7, skb)) {
  66                 return 1;
  67         }
  68
  69         if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {
  70                 kfree_skb(skb);
  71                 return 1;
  72         }
  73
  74         if (skb->sk != NULL)
  75                 skb_set_owner_w(skbn, skb->sk);
  76
  77         kfree_skb(skb);
  78
  79         if (!rose_route_frame(skbn, NULL)) {
  80                 kfree_skb(skbn);
  81                 stats->tx_errors++;
  82                 return 1;
  83         }
  84
  85         stats->tx_packets++;
  86         stats->tx_bytes += skbn->len;
  87 #endif
  88         return 1;
  89 }
  90
  91 static int rose_set_mac_address(struct net_device *dev, void *addr)
  92 {
  93         struct sockaddr *sa = addr;
  94
  95         rose_del_loopback_node((rose_address *)dev->dev_addr);
  96
  97         memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
  98
  99         rose_add_loopback_node((rose_address *)dev->dev_addr);
 100
 101         return 0;
 102 }
 103
 104 static int rose_open(struct net_device *dev)
 105 {
 106         netif_start_queue(dev);
 107         rose_add_loopback_node((rose_address *)dev->dev_addr);
 108         return 0;
 109 }
 110
 111 static int rose_close(struct net_device *dev)
 112 {
 113         netif_stop_queue(dev);
 114         rose_del_loopback_node((rose_address *)dev->dev_addr);
 115         return 0;
 116 }
 117
 118 static int rose_xmit(struct sk_buff *skb, struct net_device *dev)
 119 {
 120         struct net_device_stats *stats = netdev_priv(dev);
 121
 122         if (!netif_running(dev)) {
 123                 printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
 124                 return 1;
 125         }
 126         dev_kfree_skb(skb);
 127         stats->tx_errors++;
 128         return 0;
 129 }
 130
 131 static struct net_device_stats *rose_get_stats(struct net_device *dev)
 132 {
 133         return netdev_priv(dev);
 134 }
 135
 136 void rose_setup(struct net_device *dev)
 137 {
 138         SET_MODULE_OWNER(dev);
 139         dev->mtu                = ROSE_MAX_PACKET_SIZE - 2;
 140         dev->hard_start_xmit    = rose_xmit;
 141         dev->open               = rose_open;
 142         dev->stop               = rose_close;
 143
 144         dev->hard_header        = rose_header;
 145         dev->hard_header_len    = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
 146         dev->addr_len           = ROSE_ADDR_LEN;
 147         dev->type               = ARPHRD_ROSE;
 148         dev->rebuild_header     = rose_rebuild_header;
 149         dev->set_mac_address    = rose_set_mac_address;
 150
 151         /* New-style flags. */
 152         dev->flags              = IFF_NOARP;
 153         dev->get_stats = rose_get_stats;
 154 }