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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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8f3af27786
While testing my SIT/GRO patch using netfilter TEE module and a dummy device, I found some features were missing : TSO IPv6, UFO, and encapsulated traffic. ethtool -k dummy0 now gives : ... tcp-segmentation-offload: on tx-tcp-segmentation: on tx-tcp-ecn-segmentation: on tx-tcp6-segmentation: on udp-fragmentation-offload: on ... tx-gre-segmentation: on tx-ipip-segmentation: on tx-sit-segmentation: on tx-udp_tnl-segmentation: on Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
232 lines
5.5 KiB
C
232 lines
5.5 KiB
C
/* dummy.c: a dummy net driver
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The purpose of this driver is to provide a device to point a
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route through, but not to actually transmit packets.
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Why? If you have a machine whose only connection is an occasional
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PPP/SLIP/PLIP link, you can only connect to your own hostname
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when the link is up. Otherwise you have to use localhost.
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This isn't very consistent.
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One solution is to set up a dummy link using PPP/SLIP/PLIP,
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but this seems (to me) too much overhead for too little gain.
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This driver provides a small alternative. Thus you can do
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[when not running slip]
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ifconfig dummy slip.addr.ess.here up
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[to go to slip]
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ifconfig dummy down
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dip whatever
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This was written by looking at Donald Becker's skeleton driver
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and the loopback driver. I then threw away anything that didn't
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apply! Thanks to Alan Cox for the key clue on what to do with
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misguided packets.
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Nick Holloway, 27th May 1994
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[I tweaked this explanation a little but that's all]
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Alan Cox, 30th May 1994
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/init.h>
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#include <linux/moduleparam.h>
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#include <linux/rtnetlink.h>
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#include <net/rtnetlink.h>
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#include <linux/u64_stats_sync.h>
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#define DRV_NAME "dummy"
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#define DRV_VERSION "1.0"
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static int numdummies = 1;
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/* fake multicast ability */
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static void set_multicast_list(struct net_device *dev)
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{
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}
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struct pcpu_dstats {
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u64 tx_packets;
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u64 tx_bytes;
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struct u64_stats_sync syncp;
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};
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static struct rtnl_link_stats64 *dummy_get_stats64(struct net_device *dev,
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struct rtnl_link_stats64 *stats)
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{
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int i;
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for_each_possible_cpu(i) {
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const struct pcpu_dstats *dstats;
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u64 tbytes, tpackets;
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unsigned int start;
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dstats = per_cpu_ptr(dev->dstats, i);
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do {
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start = u64_stats_fetch_begin_irq(&dstats->syncp);
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tbytes = dstats->tx_bytes;
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tpackets = dstats->tx_packets;
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} while (u64_stats_fetch_retry_irq(&dstats->syncp, start));
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stats->tx_bytes += tbytes;
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stats->tx_packets += tpackets;
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}
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return stats;
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}
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static netdev_tx_t dummy_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats);
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u64_stats_update_begin(&dstats->syncp);
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dstats->tx_packets++;
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dstats->tx_bytes += skb->len;
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u64_stats_update_end(&dstats->syncp);
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dev_kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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static int dummy_dev_init(struct net_device *dev)
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{
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dev->dstats = netdev_alloc_pcpu_stats(struct pcpu_dstats);
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if (!dev->dstats)
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return -ENOMEM;
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return 0;
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}
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static void dummy_dev_uninit(struct net_device *dev)
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{
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free_percpu(dev->dstats);
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}
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static int dummy_change_carrier(struct net_device *dev, bool new_carrier)
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{
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if (new_carrier)
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netif_carrier_on(dev);
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else
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netif_carrier_off(dev);
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return 0;
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}
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static const struct net_device_ops dummy_netdev_ops = {
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.ndo_init = dummy_dev_init,
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.ndo_uninit = dummy_dev_uninit,
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.ndo_start_xmit = dummy_xmit,
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.ndo_validate_addr = eth_validate_addr,
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.ndo_set_rx_mode = set_multicast_list,
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.ndo_set_mac_address = eth_mac_addr,
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.ndo_get_stats64 = dummy_get_stats64,
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.ndo_change_carrier = dummy_change_carrier,
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};
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static void dummy_get_drvinfo(struct net_device *dev,
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struct ethtool_drvinfo *info)
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{
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strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
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strlcpy(info->version, DRV_VERSION, sizeof(info->version));
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}
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static const struct ethtool_ops dummy_ethtool_ops = {
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.get_drvinfo = dummy_get_drvinfo,
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};
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static void dummy_setup(struct net_device *dev)
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{
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ether_setup(dev);
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/* Initialize the device structure. */
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dev->netdev_ops = &dummy_netdev_ops;
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dev->ethtool_ops = &dummy_ethtool_ops;
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dev->destructor = free_netdev;
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/* Fill in device structure with ethernet-generic values. */
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dev->flags |= IFF_NOARP;
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dev->flags &= ~IFF_MULTICAST;
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dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE;
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dev->features |= NETIF_F_SG | NETIF_F_FRAGLIST;
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dev->features |= NETIF_F_ALL_TSO | NETIF_F_UFO;
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dev->features |= NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_LLTX;
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dev->features |= NETIF_F_GSO_ENCAP_ALL;
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dev->hw_features |= dev->features;
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dev->hw_enc_features |= dev->features;
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eth_hw_addr_random(dev);
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}
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static int dummy_validate(struct nlattr *tb[], struct nlattr *data[])
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{
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if (tb[IFLA_ADDRESS]) {
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if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
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return -EINVAL;
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if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
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return -EADDRNOTAVAIL;
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}
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return 0;
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}
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static struct rtnl_link_ops dummy_link_ops __read_mostly = {
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.kind = DRV_NAME,
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.setup = dummy_setup,
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.validate = dummy_validate,
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};
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/* Number of dummy devices to be set up by this module. */
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module_param(numdummies, int, 0);
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MODULE_PARM_DESC(numdummies, "Number of dummy pseudo devices");
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static int __init dummy_init_one(void)
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{
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struct net_device *dev_dummy;
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int err;
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dev_dummy = alloc_netdev(0, "dummy%d", NET_NAME_UNKNOWN, dummy_setup);
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if (!dev_dummy)
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return -ENOMEM;
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dev_dummy->rtnl_link_ops = &dummy_link_ops;
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err = register_netdevice(dev_dummy);
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if (err < 0)
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goto err;
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return 0;
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err:
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free_netdev(dev_dummy);
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return err;
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}
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static int __init dummy_init_module(void)
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{
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int i, err = 0;
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rtnl_lock();
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err = __rtnl_link_register(&dummy_link_ops);
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if (err < 0)
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goto out;
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for (i = 0; i < numdummies && !err; i++) {
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err = dummy_init_one();
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cond_resched();
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}
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if (err < 0)
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__rtnl_link_unregister(&dummy_link_ops);
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out:
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rtnl_unlock();
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return err;
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}
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static void __exit dummy_cleanup_module(void)
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{
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rtnl_link_unregister(&dummy_link_ops);
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}
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module_init(dummy_init_module);
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module_exit(dummy_cleanup_module);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_RTNL_LINK(DRV_NAME);
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MODULE_VERSION(DRV_VERSION);
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