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139 lines
3.0 KiB
139 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/ethtool.h> |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/if_arp.h> |
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#include <net/rtnetlink.h> |
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#include <net/sock.h> |
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#include <net/af_vsock.h> |
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#include <uapi/linux/vsockmon.h> |
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#include <linux/virtio_vsock.h> |
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/* Virtio transport max packet size plus header */ |
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#define DEFAULT_MTU (VIRTIO_VSOCK_MAX_PKT_BUF_SIZE + \ |
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sizeof(struct af_vsockmon_hdr)) |
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static int vsockmon_dev_init(struct net_device *dev) |
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{ |
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dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); |
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if (!dev->lstats) |
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return -ENOMEM; |
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return 0; |
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} |
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static void vsockmon_dev_uninit(struct net_device *dev) |
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{ |
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free_percpu(dev->lstats); |
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} |
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struct vsockmon { |
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struct vsock_tap vt; |
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}; |
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static int vsockmon_open(struct net_device *dev) |
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{ |
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struct vsockmon *vsockmon = netdev_priv(dev); |
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vsockmon->vt.dev = dev; |
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vsockmon->vt.module = THIS_MODULE; |
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return vsock_add_tap(&vsockmon->vt); |
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} |
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static int vsockmon_close(struct net_device *dev) |
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{ |
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struct vsockmon *vsockmon = netdev_priv(dev); |
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return vsock_remove_tap(&vsockmon->vt); |
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} |
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static netdev_tx_t vsockmon_xmit(struct sk_buff *skb, struct net_device *dev) |
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{ |
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dev_lstats_add(dev, skb->len); |
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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 void |
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vsockmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) |
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{ |
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dev_lstats_read(dev, &stats->rx_packets, &stats->rx_bytes); |
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stats->tx_packets = 0; |
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stats->tx_bytes = 0; |
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} |
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static int vsockmon_is_valid_mtu(int new_mtu) |
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{ |
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return new_mtu >= (int)sizeof(struct af_vsockmon_hdr); |
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} |
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static int vsockmon_change_mtu(struct net_device *dev, int new_mtu) |
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{ |
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if (!vsockmon_is_valid_mtu(new_mtu)) |
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return -EINVAL; |
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dev->mtu = new_mtu; |
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return 0; |
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} |
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static const struct net_device_ops vsockmon_ops = { |
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.ndo_init = vsockmon_dev_init, |
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.ndo_uninit = vsockmon_dev_uninit, |
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.ndo_open = vsockmon_open, |
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.ndo_stop = vsockmon_close, |
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.ndo_start_xmit = vsockmon_xmit, |
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.ndo_get_stats64 = vsockmon_get_stats64, |
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.ndo_change_mtu = vsockmon_change_mtu, |
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}; |
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static u32 always_on(struct net_device *dev) |
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{ |
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return 1; |
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} |
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static const struct ethtool_ops vsockmon_ethtool_ops = { |
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.get_link = always_on, |
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}; |
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static void vsockmon_setup(struct net_device *dev) |
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{ |
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dev->type = ARPHRD_VSOCKMON; |
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dev->priv_flags |= IFF_NO_QUEUE; |
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dev->netdev_ops = &vsockmon_ops; |
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dev->ethtool_ops = &vsockmon_ethtool_ops; |
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dev->needs_free_netdev = true; |
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dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | |
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NETIF_F_HIGHDMA | NETIF_F_LLTX; |
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dev->flags = IFF_NOARP; |
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dev->mtu = DEFAULT_MTU; |
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} |
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static struct rtnl_link_ops vsockmon_link_ops __read_mostly = { |
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.kind = "vsockmon", |
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.priv_size = sizeof(struct vsockmon), |
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.setup = vsockmon_setup, |
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}; |
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static __init int vsockmon_register(void) |
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{ |
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return rtnl_link_register(&vsockmon_link_ops); |
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} |
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static __exit void vsockmon_unregister(void) |
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{ |
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rtnl_link_unregister(&vsockmon_link_ops); |
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} |
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module_init(vsockmon_register); |
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module_exit(vsockmon_unregister); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Gerard Garcia <[email protected]>"); |
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MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device."); |
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MODULE_ALIAS_RTNL_LINK("vsockmon");
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