Linux 内核虚拟网络设备驱动示例 vnet

Linux 虚拟网络设备驱动 (vnet)

源代码

#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/ip.h>
#include <asm/system.h>



 
  ;
   {
    .ndo_start_xmit = virt_net_send_packet,
};

   {
    
      *type;
    
    __be32 *saddr, *daddr, tmp;
      tmp_dev_addr[ETH_ALEN];
    
    
    
    
    ethhdr = ( ethhdr *)skb->data;
    (tmp_dev_addr, ethhdr->h_dest, ETH_ALEN);
    (ethhdr->h_dest, ethhdr->h_source, ETH_ALEN);
    (ethhdr->h_source, tmp_dev_addr, ETH_ALEN);
    
    ih = ( iphdr *)(skb->data + ( ethhdr));
    saddr = &ih->saddr;
    daddr = &ih->daddr;
    tmp = *saddr;
    *saddr = *daddr;
    *daddr = tmp;
    
    
    type = skb->data + ( ethhdr) + ( iphdr);
    
    
    *type = ; 
    ih->check = ; 
    ih->check = ip_fast_csum((  *)ih,ih->ihl);
    
    rx_skb = dev_alloc_skb(skb->len + );
    skb_reserve(rx_skb, ); 
    (skb_put(rx_skb, skb->len), skb->data, skb->len);
    
    rx_skb->dev = dev;
    rx_skb->protocol = eth_type_trans(rx_skb, dev);
    rx_skb->ip_summed = CHECKSUM_UNNECESSARY; 
    dev->stats.rx_packets++;
    dev->stats.rx_bytes += skb->len;
    
    netif_rx(rx_skb);
}

   {
    
    
    
    netif_stop_queue(dev); 
    
    
    
    emulator_rx_packet(skb, dev);
    dev_kfree_skb (skb); 
    netif_wake_queue(dev); 
    virt_net_dev->stats.tx_packets++;
    virt_net_dev->stats.tx_bytes +=skb->len;
     ;
}

  {
    ether_setup(dev);
    dev->netdev_ops= &virt_net_ops; 
    
    dev->dev_addr[] = ;
    dev->dev_addr[] = ;
    dev->dev_addr[] = ;
    dev->dev_addr[] = ;
    dev->dev_addr[] = ;
    dev->dev_addr[] = ;
    
    dev->flags |= IFF_NOARP;
    dev->features |= NETIF_F_NO_CSUM;
}

  __init  {
     ret;
    
    virt_net_dev = alloc_netdev(, , virt_net_init);
     (!virt_net_dev) {
        printk();
         -ENOMEM;
    }
    ret = register_netdev(virt_net_dev);
     ret;
}

   {
    unregister_netdev(virt_net_dev);
    free_netdev(virt_net_dev);
}

module_init(s3c_virt_net_init);
module_exit(s3c_virt_net_exit);
MODULE_LICENSE();