LXR linux-bk/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/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
  40static 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
  57static 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
  91static 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
 104static 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
 111static 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
 118static 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
 131static struct net_device_stats *rose_get_stats(struct net_device *dev)
 132{
 133        return netdev_priv(dev);
 134}
 135
 136void 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              = 0;
 153        dev->get_stats = rose_get_stats;
 154}
 155