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