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veth pari是用于不同nerwork namespace间进行通信的方式。其代码在driver/net/veth.c中其入口函数如下：可以看出这是以模块的形参存在中的static __init int veth_init(void){	return rtnl_link_register(&veth_link_ops);}module_init(veth_init);module_exit(veth_exit);MODULE_DESCRIPTION("Virtual Ethernet Tunnel");从veth_link_ops 的veth_newlink	 中可以看到veth 是将两个device绑定在一起static struct rtnl_link_ops veth_link_ops = {	.kind		= DRV_NAME,	.priv_size	= sizeof(struct veth_priv),	.setup		= veth_setup,	.validate	= veth_validate,	.newlink	= veth_newlink,	.dellink	= veth_dellink,	.policy		= veth_policy,	.maxtype	= VETH_INFO_MAX,	.get_link_net	= veth_get_link_net,};static int veth_newlink(struct net *src_net, struct net_device *dev,			struct nlattr *tb[], struct nlattr *data[],			struct netlink_ext_ack *extack){		/*	 * tie the deviced together	 */	priv = netdev_priv(dev);	rcu_assign_pointer(priv->peer, peer);	priv = netdev_priv(peer);	rcu_assign_pointer(priv->peer, dev);	return 0;}再看一下最重要的发送函数static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev){	struct veth_priv *priv = netdev_priv(dev);	struct net_device *rcv;	int length = skb->len;	rcu_read_lock();#得到要发送的net_device rcv	rcv = rcu_dereference(priv->peer);	if (unlikely(!rcv)) {		kfree_skb(skb);		goto drop;	}#通过dev_forward_skb将skb数据发送到rcv中	if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {#发送成功后更新统计信息		struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);		u64_stats_update_begin(&stats->syncp);		stats->bytes += length;		stats->packets++;		u64_stats_update_end(&stats->syncp);	} else {drop:		atomic64_inc(&priv->dropped);	}	rcu_read_unlock();	return NETDEV_TX_OK;}

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