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/*

 *      ROSE release 003

 *

 *      This code REQUIRES 2.1.0 or higher/ NET3.029

 *

 *      This module:

 *              This module 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.

 *

 *      History

 *      ROSE 001        Jonathan(G4KLX) Cloned from nr_dev.c.

 */

#include <linux/config.h>

#if defined(CONFIG_ROSE) || defined(CONFIG_ROSE_MODULE)

#include <linux/proc_fs.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/interrupt.h>

#include <linux/fs.h>

#include <linux/types.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>     /* For the statistics structure. */

#include <asm/system.h>

#include <asm/segment.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>

/*

 *      Only allow IP over ROSE frames through if the netrom device is up.

 */

int rose_rx_ip(struct sk_buff *skb, struct device *dev)

{

        struct enet_statistics *stats = (struct enet_statistics *)dev->priv;

        if (!dev->start) {

                stats->rx_errors++;

                return 0;

        }

        stats->rx_packets++;

        skb->protocol = htons(ETH_P_IP);

        /* Spoof incoming device */

        skb->dev = dev;

        skb->h.raw = skb->data;

        ip_rcv(skb, skb->dev, NULL);

        return 1;

}

static int rose_header(struct sk_buff *skb, struct device *dev, unsigned short type,

        void *daddr, 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(void *buff, struct device *dev,

        unsigned long raddr, struct sk_buff *skb)

{

        struct enet_statistics *stats = (struct enet_statistics *)dev->priv;

        unsigned char *bp = (unsigned char *)buff;

        struct sk_buff *skbn;

        if (!arp_query(bp + 7, raddr, dev)) {

                dev_kfree_skb(skb, FREE_WRITE);

                return 1;

        }

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

                dev_kfree_skb(skb, FREE_WRITE);

                return 1;

        }

        skbn->sk = skb->sk;

        if (skbn->sk != NULL)

                atomic_add(skbn->truesize, &skbn->sk->wmem_alloc);

        dev_kfree_skb(skb, FREE_WRITE);

        if (!rose_route_frame(skbn, NULL)) {

                dev_kfree_skb(skbn, FREE_WRITE);

                stats->tx_errors++;

        }

        stats->tx_packets++;

        return 1;

}

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

{

        struct sockaddr *sa = addr;

        ax25_listen_release((ax25_address *)dev->dev_addr, NULL);

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

        ax25_listen_register((ax25_address *)dev->dev_addr, NULL);

        return 0;

}

static int rose_open(struct device *dev)

{

        dev->tbusy = 0;

        dev->start = 1;

        ax25_listen_register((ax25_address *)dev->dev_addr, NULL);

        return 0;

}

static int rose_close(struct device *dev)

{

        dev->tbusy = 1;

        dev->start = 0;

        ax25_listen_release((ax25_address *)dev->dev_addr, NULL);

        return 0;

}

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

{

        struct enet_statistics *stats = (struct enet_statistics *)dev->priv;

        if (skb == NULL || dev == NULL)

                return 0;

        if (!dev->start) {

                printk(KERN_ERR "rose: xmit call when iface is down\n");

                return 1;

        }

        cli();

        if (dev->tbusy != 0) {

                sti();

                stats->tx_errors++;

                return 1;

        }

        dev->tbusy = 1;

        sti();

        dev_kfree_skb(skb, FREE_WRITE);

        stats->tx_errors++;

        dev->tbusy = 0;

        mark_bh(NET_BH);

        return 0;

}

static struct enet_statistics *rose_get_stats(struct device *dev)

{

        return (struct enet_statistics *)dev->priv;

}

int rose_init(struct device *dev)

{

        int i;

        dev->mtu                = ROSE_MAX_PACKET_SIZE - 2;

        dev->tbusy              = 0;

        dev->hard_start_xmit    = rose_xmit;

        dev->open               = rose_open;

        dev->stop               = rose_close;

        dev->hard_header        = rose_header;

        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->rebuild_header     = rose_rebuild_header;

        dev->set_mac_address    = rose_set_mac_address;

        /* New-style flags. */

        dev->flags              = 0;

        dev->family             = AF_INET;

#ifdef CONFIG_INET

        dev->pa_addr            = in_aton("192.168.0.1");

        dev->pa_brdaddr         = in_aton("192.168.0.255");

        dev->pa_mask            = in_aton("255.255.255.0");

        dev->pa_alen            = 4;

#endif

        if ((dev->priv = kmalloc(sizeof(struct enet_statistics), GFP_KERNEL)) == NULL)

                return -ENOMEM;

        memset(dev->priv, 0, sizeof(struct enet_statistics));

        dev->get_stats = rose_get_stats;

        /* Fill in the generic fields of the device structure. */

        for (i = 0; i < DEV_NUMBUFFS; i++)

                skb_queue_head_init(&dev->buffs[i]);

        return 0;

};

#endif