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