[linux-2.6-block.git] / drivers / net / vsockmon.c

// SPDX-License-Identifier: GPL-2.0-only
#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");
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
0b2e6644 GG	2	#include <linux/module.h>
	3	#include <linux/kernel.h>
	4	#include <linux/if_arp.h>
	5	#include <net/rtnetlink.h>
	6	#include <net/sock.h>
	7	#include <net/af_vsock.h>
	8	#include <uapi/linux/vsockmon.h>
	9	#include <linux/virtio_vsock.h>
	10
	11	/* Virtio transport max packet size plus header */
	12	#define DEFAULT_MTU (VIRTIO_VSOCK_MAX_PKT_BUF_SIZE + \
	13	sizeof(struct af_vsockmon_hdr))
	14
0b2e6644 GG	15	static int vsockmon_dev_init(struct net_device *dev)
	16	{
	17	dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
	18	if (!dev->lstats)
	19	return -ENOMEM;
	20	return 0;
	21	}
	22
	23	static void vsockmon_dev_uninit(struct net_device *dev)
	24	{
	25	free_percpu(dev->lstats);
	26	}
	27
	28	struct vsockmon {
	29	struct vsock_tap vt;
	30	};
	31
	32	static int vsockmon_open(struct net_device *dev)
	33	{
	34	struct vsockmon *vsockmon = netdev_priv(dev);
	35
	36	vsockmon->vt.dev = dev;
	37	vsockmon->vt.module = THIS_MODULE;
	38	return vsock_add_tap(&vsockmon->vt);
	39	}
	40
	41	static int vsockmon_close(struct net_device *dev)
	42	{
	43	struct vsockmon *vsockmon = netdev_priv(dev);
	44
	45	return vsock_remove_tap(&vsockmon->vt);
	46	}
	47
	48	static netdev_tx_t vsockmon_xmit(struct sk_buff skb, struct net_device dev)
	49	{
4f77eb09	50	dev_lstats_add(dev, skb->len);
0b2e6644 GG	51
	52	dev_kfree_skb(skb);
	53
	54	return NETDEV_TX_OK;
	55	}
	56
	57	static void
	58	vsockmon_get_stats64(struct net_device dev, struct rtnl_link_stats64 stats)
	59	{
4f77eb09	60	dev_lstats_read(dev, &stats->rx_packets, &stats->rx_bytes);
0b2e6644	61
0b2e6644	62	stats->tx_packets = 0;
0b2e6644 GG	63	stats->tx_bytes = 0;
	64	}
	65
	66	static int vsockmon_is_valid_mtu(int new_mtu)
	67	{
	68	return new_mtu >= (int)sizeof(struct af_vsockmon_hdr);
	69	}
	70
	71	static int vsockmon_change_mtu(struct net_device *dev, int new_mtu)
	72	{
	73	if (!vsockmon_is_valid_mtu(new_mtu))
	74	return -EINVAL;
	75
	76	dev->mtu = new_mtu;
	77	return 0;
	78	}
	79
	80	static const struct net_device_ops vsockmon_ops = {
	81	.ndo_init = vsockmon_dev_init,
	82	.ndo_uninit = vsockmon_dev_uninit,
	83	.ndo_open = vsockmon_open,
	84	.ndo_stop = vsockmon_close,
	85	.ndo_start_xmit = vsockmon_xmit,
	86	.ndo_get_stats64 = vsockmon_get_stats64,
	87	.ndo_change_mtu = vsockmon_change_mtu,
	88	};
	89
	90	static u32 always_on(struct net_device *dev)
	91	{
	92	return 1;
	93	}
	94
	95	static const struct ethtool_ops vsockmon_ethtool_ops = {
	96	.get_link = always_on,
	97	};
	98
	99	static void vsockmon_setup(struct net_device *dev)
	100	{
	101	dev->type = ARPHRD_VSOCKMON;
	102	dev->priv_flags \|= IFF_NO_QUEUE;
	103
	104	dev->netdev_ops = &vsockmon_ops;
	105	dev->ethtool_ops = &vsockmon_ethtool_ops;
cf124db5	106	dev->needs_free_netdev = true;
0b2e6644 GG	107
	108	dev->features = NETIF_F_SG \| NETIF_F_FRAGLIST \|
	109	NETIF_F_HIGHDMA \| NETIF_F_LLTX;
	110
	111	dev->flags = IFF_NOARP;
	112
	113	dev->mtu = DEFAULT_MTU;
	114	}
	115
	116	static struct rtnl_link_ops vsockmon_link_ops __read_mostly = {
	117	.kind = "vsockmon",
	118	.priv_size = sizeof(struct vsockmon),
	119	.setup = vsockmon_setup,
	120	};
	121
	122	static __init int vsockmon_register(void)
	123	{
	124	return rtnl_link_register(&vsockmon_link_ops);
	125	}
	126
	127	static __exit void vsockmon_unregister(void)
	128	{
	129	rtnl_link_unregister(&vsockmon_link_ops);
	130	}
	131
	132	module_init(vsockmon_register);
	133	module_exit(vsockmon_unregister);
	134
	135	MODULE_LICENSE("GPL v2");
	136	MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>");
	137	MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device.");
	138	MODULE_ALIAS_RTNL_LINK("vsockmon");