root/net/rose/rose_dev.c

DEFINITIONS

1. rose_header
2. rose_rebuild_header
3. rose_set_mac_address
4. rose_open
5. rose_close
6. rose_xmit
7. rose_get_stats
8. rose_setup

/*
 * 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;
}