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0b2e6644 GG |
1 | #include <linux/module.h> |
2 | #include <linux/kernel.h> | |
3 | #include <linux/if_arp.h> | |
4 | #include <net/rtnetlink.h> | |
5 | #include <net/sock.h> | |
6 | #include <net/af_vsock.h> | |
7 | #include <uapi/linux/vsockmon.h> | |
8 | #include <linux/virtio_vsock.h> | |
9 | ||
10 | /* Virtio transport max packet size plus header */ | |
11 | #define DEFAULT_MTU (VIRTIO_VSOCK_MAX_PKT_BUF_SIZE + \ | |
12 | sizeof(struct af_vsockmon_hdr)) | |
13 | ||
14 | struct pcpu_lstats { | |
15 | u64 rx_packets; | |
16 | u64 rx_bytes; | |
17 | struct u64_stats_sync syncp; | |
18 | }; | |
19 | ||
20 | static int vsockmon_dev_init(struct net_device *dev) | |
21 | { | |
22 | dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); | |
23 | if (!dev->lstats) | |
24 | return -ENOMEM; | |
25 | return 0; | |
26 | } | |
27 | ||
28 | static void vsockmon_dev_uninit(struct net_device *dev) | |
29 | { | |
30 | free_percpu(dev->lstats); | |
31 | } | |
32 | ||
33 | struct vsockmon { | |
34 | struct vsock_tap vt; | |
35 | }; | |
36 | ||
37 | static int vsockmon_open(struct net_device *dev) | |
38 | { | |
39 | struct vsockmon *vsockmon = netdev_priv(dev); | |
40 | ||
41 | vsockmon->vt.dev = dev; | |
42 | vsockmon->vt.module = THIS_MODULE; | |
43 | return vsock_add_tap(&vsockmon->vt); | |
44 | } | |
45 | ||
46 | static int vsockmon_close(struct net_device *dev) | |
47 | { | |
48 | struct vsockmon *vsockmon = netdev_priv(dev); | |
49 | ||
50 | return vsock_remove_tap(&vsockmon->vt); | |
51 | } | |
52 | ||
53 | static netdev_tx_t vsockmon_xmit(struct sk_buff *skb, struct net_device *dev) | |
54 | { | |
55 | int len = skb->len; | |
56 | struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats); | |
57 | ||
58 | u64_stats_update_begin(&stats->syncp); | |
59 | stats->rx_bytes += len; | |
60 | stats->rx_packets++; | |
61 | u64_stats_update_end(&stats->syncp); | |
62 | ||
63 | dev_kfree_skb(skb); | |
64 | ||
65 | return NETDEV_TX_OK; | |
66 | } | |
67 | ||
68 | static void | |
69 | vsockmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) | |
70 | { | |
71 | int i; | |
72 | u64 bytes = 0, packets = 0; | |
73 | ||
74 | for_each_possible_cpu(i) { | |
75 | const struct pcpu_lstats *vstats; | |
76 | u64 tbytes, tpackets; | |
77 | unsigned int start; | |
78 | ||
79 | vstats = per_cpu_ptr(dev->lstats, i); | |
80 | ||
81 | do { | |
82 | start = u64_stats_fetch_begin_irq(&vstats->syncp); | |
83 | tbytes = vstats->rx_bytes; | |
84 | tpackets = vstats->rx_packets; | |
85 | } while (u64_stats_fetch_retry_irq(&vstats->syncp, start)); | |
86 | ||
87 | packets += tpackets; | |
88 | bytes += tbytes; | |
89 | } | |
90 | ||
91 | stats->rx_packets = packets; | |
92 | stats->tx_packets = 0; | |
93 | ||
94 | stats->rx_bytes = bytes; | |
95 | stats->tx_bytes = 0; | |
96 | } | |
97 | ||
98 | static int vsockmon_is_valid_mtu(int new_mtu) | |
99 | { | |
100 | return new_mtu >= (int)sizeof(struct af_vsockmon_hdr); | |
101 | } | |
102 | ||
103 | static int vsockmon_change_mtu(struct net_device *dev, int new_mtu) | |
104 | { | |
105 | if (!vsockmon_is_valid_mtu(new_mtu)) | |
106 | return -EINVAL; | |
107 | ||
108 | dev->mtu = new_mtu; | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static const struct net_device_ops vsockmon_ops = { | |
113 | .ndo_init = vsockmon_dev_init, | |
114 | .ndo_uninit = vsockmon_dev_uninit, | |
115 | .ndo_open = vsockmon_open, | |
116 | .ndo_stop = vsockmon_close, | |
117 | .ndo_start_xmit = vsockmon_xmit, | |
118 | .ndo_get_stats64 = vsockmon_get_stats64, | |
119 | .ndo_change_mtu = vsockmon_change_mtu, | |
120 | }; | |
121 | ||
122 | static u32 always_on(struct net_device *dev) | |
123 | { | |
124 | return 1; | |
125 | } | |
126 | ||
127 | static const struct ethtool_ops vsockmon_ethtool_ops = { | |
128 | .get_link = always_on, | |
129 | }; | |
130 | ||
131 | static void vsockmon_setup(struct net_device *dev) | |
132 | { | |
133 | dev->type = ARPHRD_VSOCKMON; | |
134 | dev->priv_flags |= IFF_NO_QUEUE; | |
135 | ||
136 | dev->netdev_ops = &vsockmon_ops; | |
137 | dev->ethtool_ops = &vsockmon_ethtool_ops; | |
cf124db5 | 138 | dev->needs_free_netdev = true; |
0b2e6644 GG |
139 | |
140 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | | |
141 | NETIF_F_HIGHDMA | NETIF_F_LLTX; | |
142 | ||
143 | dev->flags = IFF_NOARP; | |
144 | ||
145 | dev->mtu = DEFAULT_MTU; | |
146 | } | |
147 | ||
148 | static struct rtnl_link_ops vsockmon_link_ops __read_mostly = { | |
149 | .kind = "vsockmon", | |
150 | .priv_size = sizeof(struct vsockmon), | |
151 | .setup = vsockmon_setup, | |
152 | }; | |
153 | ||
154 | static __init int vsockmon_register(void) | |
155 | { | |
156 | return rtnl_link_register(&vsockmon_link_ops); | |
157 | } | |
158 | ||
159 | static __exit void vsockmon_unregister(void) | |
160 | { | |
161 | rtnl_link_unregister(&vsockmon_link_ops); | |
162 | } | |
163 | ||
164 | module_init(vsockmon_register); | |
165 | module_exit(vsockmon_unregister); | |
166 | ||
167 | MODULE_LICENSE("GPL v2"); | |
168 | MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>"); | |
169 | MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device."); | |
170 | MODULE_ALIAS_RTNL_LINK("vsockmon"); |