171 lines
3.6 KiB
C
171 lines
3.6 KiB
C
#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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struct pcpu_lstats {
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u64 rx_packets;
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u64 rx_bytes;
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struct u64_stats_sync syncp;
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};
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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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int len = skb->len;
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struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats);
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u64_stats_update_begin(&stats->syncp);
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stats->rx_bytes += len;
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stats->rx_packets++;
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u64_stats_update_end(&stats->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 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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int i;
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u64 bytes = 0, packets = 0;
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for_each_possible_cpu(i) {
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const struct pcpu_lstats *vstats;
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u64 tbytes, tpackets;
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unsigned int start;
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vstats = per_cpu_ptr(dev->lstats, i);
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do {
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start = u64_stats_fetch_begin_irq(&vstats->syncp);
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tbytes = vstats->rx_bytes;
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tpackets = vstats->rx_packets;
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} while (u64_stats_fetch_retry_irq(&vstats->syncp, start));
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packets += tpackets;
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bytes += tbytes;
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}
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stats->rx_packets = packets;
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stats->tx_packets = 0;
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stats->rx_bytes = bytes;
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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 <ggarcia@deic.uab.cat>");
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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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