LXR linux/net/rose/rose

   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        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
  59static 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
  80static 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
  93static 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
 100static 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
 121static const struct header_ops rose_header_ops = {
 122        .create = rose_header,
 123};
 124
 125static 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
 132void 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}
 145