linux/net/rose/rose_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/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
  38static 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        *buff++ = ROSE_GFI | ROSE_Q_BIT;
  45        *buff++ = 0x00;
  46        *buff++ = ROSE_DATA;
  47        *buff++ = 0x7F;
  48        *buff++ = AX25_P_IP;
  49
  50        if (daddr != NULL)
  51                return 37;
  52
  53        return -37;
  54}
  55
  56static int rose_rebuild_header(struct sk_buff *skb)
  57{
  58#ifdef CONFIG_INET
  59        struct net_device *dev = skb->dev;
  60        struct net_device_stats *stats = &dev->stats;
  61        unsigned char *bp = (unsigned char *)skb->data;
  62        struct sk_buff *skbn;
  63        unsigned int len;
  64
  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        len = skbn->len;
  80
  81        if (!rose_route_frame(skbn, NULL)) {
  82                kfree_skb(skbn);
  83                stats->tx_errors++;
  84                return 1;
  85        }
  86
  87        stats->tx_packets++;
  88        stats->tx_bytes += len;
  89#endif
  90        return 1;
  91}
  92
  93static int rose_set_mac_address(struct net_device *dev, void *addr)
  94{
  95        struct sockaddr *sa = addr;
  96        int err;
  97
  98        if (!memcmp(dev->dev_addr, sa->sa_data, dev->addr_len))
  99                return 0;
 100
 101        if (dev->flags & IFF_UP) {
 102                err = rose_add_loopback_node((rose_address *)sa->sa_data);
 103                if (err)
 104                        return err;
 105
 106                rose_del_loopback_node((rose_address *)dev->dev_addr);
 107        }
 108
 109        memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
 110
 111        return 0;
 112}
 113
 114static int rose_open(struct net_device *dev)
 115{
 116        int err;
 117
 118        err = rose_add_loopback_node((rose_address *)dev->dev_addr);
 119        if (err)
 120                return err;
 121
 122        netif_start_queue(dev);
 123
 124        return 0;
 125}
 126
 127static int rose_close(struct net_device *dev)
 128{
 129        netif_stop_queue(dev);
 130        rose_del_loopback_node((rose_address *)dev->dev_addr);
 131        return 0;
 132}
 133
 134static netdev_tx_t rose_xmit(struct sk_buff *skb, struct net_device *dev)
 135{
 136        struct net_device_stats *stats = &dev->stats;
 137
 138        if (!netif_running(dev)) {
 139                printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");
 140                return NETDEV_TX_BUSY;
 141        }
 142        dev_kfree_skb(skb);
 143        stats->tx_errors++;
 144        return NETDEV_TX_OK;
 145}
 146
 147static const struct header_ops rose_header_ops = {
 148        .create = rose_header,
 149        .rebuild= rose_rebuild_header,
 150};
 151
 152static const struct net_device_ops rose_netdev_ops = {
 153        .ndo_open               = rose_open,
 154        .ndo_stop               = rose_close,
 155        .ndo_start_xmit         = rose_xmit,
 156        .ndo_set_mac_address    = rose_set_mac_address,
 157};
 158
 159void rose_setup(struct net_device *dev)
 160{
 161        dev->mtu                = ROSE_MAX_PACKET_SIZE - 2;
 162        dev->netdev_ops         = &rose_netdev_ops;
 163
 164        dev->header_ops         = &rose_header_ops;
 165        dev->hard_header_len    = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;
 166        dev->addr_len           = ROSE_ADDR_LEN;
 167        dev->type               = ARPHRD_ROSE;
 168
 169        /* New-style flags. */
 170        dev->flags              = IFF_NOARP;
 171}
 172
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