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// 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))
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);
}
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;
WRITE_ONCE(dev->mtu, new_mtu);
return 0;
}
static const struct net_device_ops vsockmon_ops = {
.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->lltx = true;
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;
dev->flags = IFF_NOARP;
dev->mtu = DEFAULT_MTU;
dev->pcpu_stat_type = NETDEV_PCPU_STAT_LSTATS;
}
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");
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