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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 | { | |
50 | int len = skb->len; | |
51 | struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats); | |
52 | ||
53 | u64_stats_update_begin(&stats->syncp); | |
52bb6677 LR |
54 | stats->bytes += len; |
55 | stats->packets++; | |
0b2e6644 GG |
56 | u64_stats_update_end(&stats->syncp); |
57 | ||
58 | dev_kfree_skb(skb); | |
59 | ||
60 | return NETDEV_TX_OK; | |
61 | } | |
62 | ||
63 | static void | |
64 | vsockmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) | |
65 | { | |
66 | int i; | |
67 | u64 bytes = 0, packets = 0; | |
68 | ||
69 | for_each_possible_cpu(i) { | |
70 | const struct pcpu_lstats *vstats; | |
71 | u64 tbytes, tpackets; | |
72 | unsigned int start; | |
73 | ||
74 | vstats = per_cpu_ptr(dev->lstats, i); | |
75 | ||
76 | do { | |
77 | start = u64_stats_fetch_begin_irq(&vstats->syncp); | |
52bb6677 LR |
78 | tbytes = vstats->bytes; |
79 | tpackets = vstats->packets; | |
0b2e6644 GG |
80 | } while (u64_stats_fetch_retry_irq(&vstats->syncp, start)); |
81 | ||
82 | packets += tpackets; | |
83 | bytes += tbytes; | |
84 | } | |
85 | ||
86 | stats->rx_packets = packets; | |
87 | stats->tx_packets = 0; | |
88 | ||
89 | stats->rx_bytes = bytes; | |
90 | stats->tx_bytes = 0; | |
91 | } | |
92 | ||
93 | static int vsockmon_is_valid_mtu(int new_mtu) | |
94 | { | |
95 | return new_mtu >= (int)sizeof(struct af_vsockmon_hdr); | |
96 | } | |
97 | ||
98 | static int vsockmon_change_mtu(struct net_device *dev, int new_mtu) | |
99 | { | |
100 | if (!vsockmon_is_valid_mtu(new_mtu)) | |
101 | return -EINVAL; | |
102 | ||
103 | dev->mtu = new_mtu; | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static const struct net_device_ops vsockmon_ops = { | |
108 | .ndo_init = vsockmon_dev_init, | |
109 | .ndo_uninit = vsockmon_dev_uninit, | |
110 | .ndo_open = vsockmon_open, | |
111 | .ndo_stop = vsockmon_close, | |
112 | .ndo_start_xmit = vsockmon_xmit, | |
113 | .ndo_get_stats64 = vsockmon_get_stats64, | |
114 | .ndo_change_mtu = vsockmon_change_mtu, | |
115 | }; | |
116 | ||
117 | static u32 always_on(struct net_device *dev) | |
118 | { | |
119 | return 1; | |
120 | } | |
121 | ||
122 | static const struct ethtool_ops vsockmon_ethtool_ops = { | |
123 | .get_link = always_on, | |
124 | }; | |
125 | ||
126 | static void vsockmon_setup(struct net_device *dev) | |
127 | { | |
128 | dev->type = ARPHRD_VSOCKMON; | |
129 | dev->priv_flags |= IFF_NO_QUEUE; | |
130 | ||
131 | dev->netdev_ops = &vsockmon_ops; | |
132 | dev->ethtool_ops = &vsockmon_ethtool_ops; | |
cf124db5 | 133 | dev->needs_free_netdev = true; |
0b2e6644 GG |
134 | |
135 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | | |
136 | NETIF_F_HIGHDMA | NETIF_F_LLTX; | |
137 | ||
138 | dev->flags = IFF_NOARP; | |
139 | ||
140 | dev->mtu = DEFAULT_MTU; | |
141 | } | |
142 | ||
143 | static struct rtnl_link_ops vsockmon_link_ops __read_mostly = { | |
144 | .kind = "vsockmon", | |
145 | .priv_size = sizeof(struct vsockmon), | |
146 | .setup = vsockmon_setup, | |
147 | }; | |
148 | ||
149 | static __init int vsockmon_register(void) | |
150 | { | |
151 | return rtnl_link_register(&vsockmon_link_ops); | |
152 | } | |
153 | ||
154 | static __exit void vsockmon_unregister(void) | |
155 | { | |
156 | rtnl_link_unregister(&vsockmon_link_ops); | |
157 | } | |
158 | ||
159 | module_init(vsockmon_register); | |
160 | module_exit(vsockmon_unregister); | |
161 | ||
162 | MODULE_LICENSE("GPL v2"); | |
163 | MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>"); | |
164 | MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device."); | |
165 | MODULE_ALIAS_RTNL_LINK("vsockmon"); |