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1// SPDX-License-Identifier: GPL-2.0-only
2#include <linux/ethtool.h>
3#include <linux/module.h>
4#include <linux/kernel.h>
5#include <linux/if_arp.h>
6#include <net/rtnetlink.h>
7#include <net/sock.h>
8#include <net/af_vsock.h>
9#include <uapi/linux/vsockmon.h>
10#include <linux/virtio_vsock.h>
11
12/* Virtio transport max packet size plus header */
13#define DEFAULT_MTU (VIRTIO_VSOCK_MAX_PKT_BUF_SIZE + \
14 sizeof(struct af_vsockmon_hdr))
15
16static int vsockmon_dev_init(struct net_device *dev)
17{
18 dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats);
19 if (!dev->lstats)
20 return -ENOMEM;
21 return 0;
22}
23
24static void vsockmon_dev_uninit(struct net_device *dev)
25{
26 free_percpu(dev->lstats);
27}
28
29struct vsockmon {
30 struct vsock_tap vt;
31};
32
33static int vsockmon_open(struct net_device *dev)
34{
35 struct vsockmon *vsockmon = netdev_priv(dev);
36
37 vsockmon->vt.dev = dev;
38 vsockmon->vt.module = THIS_MODULE;
39 return vsock_add_tap(&vsockmon->vt);
40}
41
42static int vsockmon_close(struct net_device *dev)
43{
44 struct vsockmon *vsockmon = netdev_priv(dev);
45
46 return vsock_remove_tap(&vsockmon->vt);
47}
48
49static netdev_tx_t vsockmon_xmit(struct sk_buff *skb, struct net_device *dev)
50{
51 dev_lstats_add(dev, skb->len);
52
53 dev_kfree_skb(skb);
54
55 return NETDEV_TX_OK;
56}
57
58static void
59vsockmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
60{
61 dev_lstats_read(dev, &stats->rx_packets, &stats->rx_bytes);
62
63 stats->tx_packets = 0;
64 stats->tx_bytes = 0;
65}
66
67static int vsockmon_is_valid_mtu(int new_mtu)
68{
69 return new_mtu >= (int)sizeof(struct af_vsockmon_hdr);
70}
71
72static int vsockmon_change_mtu(struct net_device *dev, int new_mtu)
73{
74 if (!vsockmon_is_valid_mtu(new_mtu))
75 return -EINVAL;
76
77 dev->mtu = new_mtu;
78 return 0;
79}
80
81static const struct net_device_ops vsockmon_ops = {
82 .ndo_init = vsockmon_dev_init,
83 .ndo_uninit = vsockmon_dev_uninit,
84 .ndo_open = vsockmon_open,
85 .ndo_stop = vsockmon_close,
86 .ndo_start_xmit = vsockmon_xmit,
87 .ndo_get_stats64 = vsockmon_get_stats64,
88 .ndo_change_mtu = vsockmon_change_mtu,
89};
90
91static u32 always_on(struct net_device *dev)
92{
93 return 1;
94}
95
96static const struct ethtool_ops vsockmon_ethtool_ops = {
97 .get_link = always_on,
98};
99
100static void vsockmon_setup(struct net_device *dev)
101{
102 dev->type = ARPHRD_VSOCKMON;
103 dev->priv_flags |= IFF_NO_QUEUE;
104
105 dev->netdev_ops = &vsockmon_ops;
106 dev->ethtool_ops = &vsockmon_ethtool_ops;
107 dev->needs_free_netdev = true;
108
109 dev->features = NETIF_F_SG | NETIF_F_FRAGLIST |
110 NETIF_F_HIGHDMA | NETIF_F_LLTX;
111
112 dev->flags = IFF_NOARP;
113
114 dev->mtu = DEFAULT_MTU;
115}
116
117static struct rtnl_link_ops vsockmon_link_ops __read_mostly = {
118 .kind = "vsockmon",
119 .priv_size = sizeof(struct vsockmon),
120 .setup = vsockmon_setup,
121};
122
123static __init int vsockmon_register(void)
124{
125 return rtnl_link_register(&vsockmon_link_ops);
126}
127
128static __exit void vsockmon_unregister(void)
129{
130 rtnl_link_unregister(&vsockmon_link_ops);
131}
132
133module_init(vsockmon_register);
134module_exit(vsockmon_unregister);
135
136MODULE_LICENSE("GPL v2");
137MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>");
138MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device.");
139MODULE_ALIAS_RTNL_LINK("vsockmon");
1// SPDX-License-Identifier: GPL-2.0-only
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
15static 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
23static void vsockmon_dev_uninit(struct net_device *dev)
24{
25 free_percpu(dev->lstats);
26}
27
28struct vsockmon {
29 struct vsock_tap vt;
30};
31
32static 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
41static 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
48static netdev_tx_t vsockmon_xmit(struct sk_buff *skb, struct net_device *dev)
49{
50 dev_lstats_add(dev, skb->len);
51
52 dev_kfree_skb(skb);
53
54 return NETDEV_TX_OK;
55}
56
57static void
58vsockmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
59{
60 dev_lstats_read(dev, &stats->rx_packets, &stats->rx_bytes);
61
62 stats->tx_packets = 0;
63 stats->tx_bytes = 0;
64}
65
66static int vsockmon_is_valid_mtu(int new_mtu)
67{
68 return new_mtu >= (int)sizeof(struct af_vsockmon_hdr);
69}
70
71static 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
80static 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
90static u32 always_on(struct net_device *dev)
91{
92 return 1;
93}
94
95static const struct ethtool_ops vsockmon_ethtool_ops = {
96 .get_link = always_on,
97};
98
99static 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;
106 dev->needs_free_netdev = true;
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
116static struct rtnl_link_ops vsockmon_link_ops __read_mostly = {
117 .kind = "vsockmon",
118 .priv_size = sizeof(struct vsockmon),
119 .setup = vsockmon_setup,
120};
121
122static __init int vsockmon_register(void)
123{
124 return rtnl_link_register(&vsockmon_link_ops);
125}
126
127static __exit void vsockmon_unregister(void)
128{
129 rtnl_link_unregister(&vsockmon_link_ops);
130}
131
132module_init(vsockmon_register);
133module_exit(vsockmon_unregister);
134
135MODULE_LICENSE("GPL v2");
136MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>");
137MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device.");
138MODULE_ALIAS_RTNL_LINK("vsockmon");