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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
cc69837f | 2 | #include <linux/ethtool.h> |
0b2e6644 GG |
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 | ||
0b2e6644 GG |
16 | static 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 | ||
24 | static void vsockmon_dev_uninit(struct net_device *dev) | |
25 | { | |
26 | free_percpu(dev->lstats); | |
27 | } | |
28 | ||
29 | struct vsockmon { | |
30 | struct vsock_tap vt; | |
31 | }; | |
32 | ||
33 | static 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 | ||
42 | static 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 | ||
49 | static netdev_tx_t vsockmon_xmit(struct sk_buff *skb, struct net_device *dev) | |
50 | { | |
4f77eb09 | 51 | dev_lstats_add(dev, skb->len); |
0b2e6644 GG |
52 | |
53 | dev_kfree_skb(skb); | |
54 | ||
55 | return NETDEV_TX_OK; | |
56 | } | |
57 | ||
58 | static void | |
59 | vsockmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) | |
60 | { | |
4f77eb09 | 61 | dev_lstats_read(dev, &stats->rx_packets, &stats->rx_bytes); |
0b2e6644 | 62 | |
0b2e6644 | 63 | stats->tx_packets = 0; |
0b2e6644 GG |
64 | stats->tx_bytes = 0; |
65 | } | |
66 | ||
67 | static int vsockmon_is_valid_mtu(int new_mtu) | |
68 | { | |
69 | return new_mtu >= (int)sizeof(struct af_vsockmon_hdr); | |
70 | } | |
71 | ||
72 | static 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 | ||
81 | static 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 | ||
91 | static u32 always_on(struct net_device *dev) | |
92 | { | |
93 | return 1; | |
94 | } | |
95 | ||
96 | static const struct ethtool_ops vsockmon_ethtool_ops = { | |
97 | .get_link = always_on, | |
98 | }; | |
99 | ||
100 | static 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; | |
cf124db5 | 107 | dev->needs_free_netdev = true; |
0b2e6644 GG |
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 | ||
117 | static struct rtnl_link_ops vsockmon_link_ops __read_mostly = { | |
118 | .kind = "vsockmon", | |
119 | .priv_size = sizeof(struct vsockmon), | |
120 | .setup = vsockmon_setup, | |
121 | }; | |
122 | ||
123 | static __init int vsockmon_register(void) | |
124 | { | |
125 | return rtnl_link_register(&vsockmon_link_ops); | |
126 | } | |
127 | ||
128 | static __exit void vsockmon_unregister(void) | |
129 | { | |
130 | rtnl_link_unregister(&vsockmon_link_ops); | |
131 | } | |
132 | ||
133 | module_init(vsockmon_register); | |
134 | module_exit(vsockmon_unregister); | |
135 | ||
136 | MODULE_LICENSE("GPL v2"); | |
137 | MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>"); | |
138 | MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device."); | |
139 | MODULE_ALIAS_RTNL_LINK("vsockmon"); |