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/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)

 */

#include <linux/module.h>

#include <linux/proc_fs.h>

#include <linux/kernel.h>

#include <linux/interrupt.h>

#include <linux/fs.h>

#include <linux/types.h>

#include <linux/sysctl.h>

#include <linux/string.h>

#include <linux/socket.h>

#include <linux/errno.h>

#include <linux/fcntl.h>

#include <linux/in.h>

#include <linux/if_ether.h>

#include <asm/system.h>

#include <asm/io.h>

#include <linux/inet.h>

#include <linux/netdevice.h>

#include <linux/etherdevice.h>

#include <linux/if_arp.h>

#include <linux/skbuff.h>

#include <net/ip.h>

#include <net/arp.h>

#include <net/ax25.h>

#include <net/rose.h>

static int rose_header(struct sk_buff *skb, struct net_device *dev,

                       unsigned short type,

                       const void *daddr, const void *saddr, unsigned len)

{

        unsigned char *buff = skb_push(skb, ROSE_MIN_LEN + 2);

        *buff++ = ROSE_GFI | ROSE_Q_BIT;

        *buff++ = 0x00;

        *buff++ = ROSE_DATA;

        *buff++ = 0x7F;

        *buff++ = AX25_P_IP;

        if (daddr != NULL)

                return 37;

        return -37;

}

static int rose_rebuild_header(struct sk_buff *skb)

{

#ifdef CONFIG_INET

        struct net_device *dev = skb->dev;

        struct net_device_stats *stats = netdev_priv(dev);

        unsigned char *bp = (unsigned char *)skb->data;

        struct sk_buff *skbn;

        unsigned int len;

        if (arp_find(bp + 7, skb)) {

                return 1;

        }

        if ((skbn = skb_clone(skb, GFP_ATOMIC)) == NULL) {

                kfree_skb(skb);

                return 1;

        }

        if (skb->sk != NULL)

                skb_set_owner_w(skbn, skb->sk);

        kfree_skb(skb);

        len = skbn->len;

        if (!rose_route_frame(skbn, NULL)) {

                kfree_skb(skbn);

                stats->tx_errors++;

                return 1;

        }

        stats->tx_packets++;

        stats->tx_bytes += len;

#endif

        return 1;

}

static int rose_set_mac_address(struct net_device *dev, void *addr)

{

        struct sockaddr *sa = addr;

        int err;

        if (!memcpy(dev->dev_addr, sa->sa_data, dev->addr_len))

                return 0;

        if (dev->flags & IFF_UP) {

                err = rose_add_loopback_node((rose_address *)dev->dev_addr);

                if (err)

                        return err;

                rose_del_loopback_node((rose_address *)dev->dev_addr);

        }

        memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);

        return 0;

}

static int rose_open(struct net_device *dev)

{

        int err;

        err = rose_add_loopback_node((rose_address *)dev->dev_addr);

        if (err)

                return err;

        netif_start_queue(dev);

        return 0;

}

static int rose_close(struct net_device *dev)

{

        netif_stop_queue(dev);

        rose_del_loopback_node((rose_address *)dev->dev_addr);

        return 0;

}

static int rose_xmit(struct sk_buff *skb, struct net_device *dev)

{

        struct net_device_stats *stats = netdev_priv(dev);

        if (!netif_running(dev)) {

                printk(KERN_ERR "ROSE: rose_xmit - called when iface is down\n");

                return 1;

        }

        dev_kfree_skb(skb);

        stats->tx_errors++;

        return 0;

}

static struct net_device_stats *rose_get_stats(struct net_device *dev)

{

        return netdev_priv(dev);

}

static const struct header_ops rose_header_ops = {

        .create = rose_header,

        .rebuild= rose_rebuild_header,

};

void rose_setup(struct net_device *dev)

{

        dev->mtu                = ROSE_MAX_PACKET_SIZE - 2;

        dev->hard_start_xmit    = rose_xmit;

        dev->open               = rose_open;

        dev->stop               = rose_close;

        dev->header_ops         = &rose_header_ops;

        dev->hard_header_len    = AX25_BPQ_HEADER_LEN + AX25_MAX_HEADER_LEN + ROSE_MIN_LEN;

        dev->addr_len           = ROSE_ADDR_LEN;

        dev->type               = ARPHRD_ROSE;

        dev->set_mac_address    = rose_set_mac_address;

        /* New-style flags. */

        dev->flags              = IFF_NOARP;

        dev->get_stats = rose_get_stats;

}