linux-imx

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/netdevice.h>

#include <linux/netlink.h>

#include <net/net_namespace.h>

#include <linux/if_arp.h>

#include <net/rtnetlink.h>

​

static netdev_tx_t nlmon_xmit(struct sk_buff *skb, struct net_device *dev)

{

    int len = skb->len;

    struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats);

​

    u64_stats_update_begin(&stats->syncp);

    stats->bytes += len;

    stats->packets++;

    u64_stats_update_end(&stats->syncp);

​

    dev_kfree_skb(skb);

​

    return NETDEV_TX_OK;

}

​

static int nlmon_dev_init(struct net_device *dev)

{

    dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);

    return dev->lstats == NULL ? -ENOMEM : 0;

}

​

static void nlmon_dev_uninit(struct net_device *dev)

{

    free_percpu(dev->lstats);

}

​

struct nlmon {

    struct netlink_tap nt;

};

​

static int nlmon_open(struct net_device *dev)

{

    struct nlmon *nlmon = netdev_priv(dev);

​

    nlmon->nt.dev = dev;

    nlmon->nt.module = THIS_MODULE;

    return netlink_add_tap(&nlmon->nt);

}

​

static int nlmon_close(struct net_device *dev)

{

    struct nlmon *nlmon = netdev_priv(dev);

​

    return netlink_remove_tap(&nlmon->nt);

}

​

static void

nlmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)

{

    int i;

    u64 bytes = 0, packets = 0;

​

    for_each_possible_cpu(i) {

        const struct pcpu_lstats *nl_stats;

        u64 tbytes, tpackets;