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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 | ||
0b2e6644 GG |
14 | static int vsockmon_dev_init(struct net_device *dev) |
15 | { | |
16 | dev->lstats = netdev_alloc_pcpu_stats(struct pcpu_lstats); | |
17 | if (!dev->lstats) | |
18 | return -ENOMEM; | |
19 | return 0; | |
20 | } | |
21 | ||
22 | static void vsockmon_dev_uninit(struct net_device *dev) | |
23 | { | |
24 | free_percpu(dev->lstats); | |
25 | } | |
26 | ||
27 | struct vsockmon { | |
28 | struct vsock_tap vt; | |
29 | }; | |
30 | ||
31 | static int vsockmon_open(struct net_device *dev) | |
32 | { | |
33 | struct vsockmon *vsockmon = netdev_priv(dev); | |
34 | ||
35 | vsockmon->vt.dev = dev; | |
36 | vsockmon->vt.module = THIS_MODULE; | |
37 | return vsock_add_tap(&vsockmon->vt); | |
38 | } | |
39 | ||
40 | static int vsockmon_close(struct net_device *dev) | |
41 | { | |
42 | struct vsockmon *vsockmon = netdev_priv(dev); | |
43 | ||
44 | return vsock_remove_tap(&vsockmon->vt); | |
45 | } | |
46 | ||
47 | static netdev_tx_t vsockmon_xmit(struct sk_buff *skb, struct net_device *dev) | |
48 | { | |
49 | int len = skb->len; | |
50 | struct pcpu_lstats *stats = this_cpu_ptr(dev->lstats); | |
51 | ||
52 | u64_stats_update_begin(&stats->syncp); | |
52bb6677 LR |
53 | stats->bytes += len; |
54 | stats->packets++; | |
0b2e6644 GG |
55 | u64_stats_update_end(&stats->syncp); |
56 | ||
57 | dev_kfree_skb(skb); | |
58 | ||
59 | return NETDEV_TX_OK; | |
60 | } | |
61 | ||
62 | static void | |
63 | vsockmon_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) | |
64 | { | |
65 | int i; | |
66 | u64 bytes = 0, packets = 0; | |
67 | ||
68 | for_each_possible_cpu(i) { | |
69 | const struct pcpu_lstats *vstats; | |
70 | u64 tbytes, tpackets; | |
71 | unsigned int start; | |
72 | ||
73 | vstats = per_cpu_ptr(dev->lstats, i); | |
74 | ||
75 | do { | |
76 | start = u64_stats_fetch_begin_irq(&vstats->syncp); | |
52bb6677 LR |
77 | tbytes = vstats->bytes; |
78 | tpackets = vstats->packets; | |
0b2e6644 GG |
79 | } while (u64_stats_fetch_retry_irq(&vstats->syncp, start)); |
80 | ||
81 | packets += tpackets; | |
82 | bytes += tbytes; | |
83 | } | |
84 | ||
85 | stats->rx_packets = packets; | |
86 | stats->tx_packets = 0; | |
87 | ||
88 | stats->rx_bytes = bytes; | |
89 | stats->tx_bytes = 0; | |
90 | } | |
91 | ||
92 | static int vsockmon_is_valid_mtu(int new_mtu) | |
93 | { | |
94 | return new_mtu >= (int)sizeof(struct af_vsockmon_hdr); | |
95 | } | |
96 | ||
97 | static int vsockmon_change_mtu(struct net_device *dev, int new_mtu) | |
98 | { | |
99 | if (!vsockmon_is_valid_mtu(new_mtu)) | |
100 | return -EINVAL; | |
101 | ||
102 | dev->mtu = new_mtu; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | static const struct net_device_ops vsockmon_ops = { | |
107 | .ndo_init = vsockmon_dev_init, | |
108 | .ndo_uninit = vsockmon_dev_uninit, | |
109 | .ndo_open = vsockmon_open, | |
110 | .ndo_stop = vsockmon_close, | |
111 | .ndo_start_xmit = vsockmon_xmit, | |
112 | .ndo_get_stats64 = vsockmon_get_stats64, | |
113 | .ndo_change_mtu = vsockmon_change_mtu, | |
114 | }; | |
115 | ||
116 | static u32 always_on(struct net_device *dev) | |
117 | { | |
118 | return 1; | |
119 | } | |
120 | ||
121 | static const struct ethtool_ops vsockmon_ethtool_ops = { | |
122 | .get_link = always_on, | |
123 | }; | |
124 | ||
125 | static void vsockmon_setup(struct net_device *dev) | |
126 | { | |
127 | dev->type = ARPHRD_VSOCKMON; | |
128 | dev->priv_flags |= IFF_NO_QUEUE; | |
129 | ||
130 | dev->netdev_ops = &vsockmon_ops; | |
131 | dev->ethtool_ops = &vsockmon_ethtool_ops; | |
cf124db5 | 132 | dev->needs_free_netdev = true; |
0b2e6644 GG |
133 | |
134 | dev->features = NETIF_F_SG | NETIF_F_FRAGLIST | | |
135 | NETIF_F_HIGHDMA | NETIF_F_LLTX; | |
136 | ||
137 | dev->flags = IFF_NOARP; | |
138 | ||
139 | dev->mtu = DEFAULT_MTU; | |
140 | } | |
141 | ||
142 | static struct rtnl_link_ops vsockmon_link_ops __read_mostly = { | |
143 | .kind = "vsockmon", | |
144 | .priv_size = sizeof(struct vsockmon), | |
145 | .setup = vsockmon_setup, | |
146 | }; | |
147 | ||
148 | static __init int vsockmon_register(void) | |
149 | { | |
150 | return rtnl_link_register(&vsockmon_link_ops); | |
151 | } | |
152 | ||
153 | static __exit void vsockmon_unregister(void) | |
154 | { | |
155 | rtnl_link_unregister(&vsockmon_link_ops); | |
156 | } | |
157 | ||
158 | module_init(vsockmon_register); | |
159 | module_exit(vsockmon_unregister); | |
160 | ||
161 | MODULE_LICENSE("GPL v2"); | |
162 | MODULE_AUTHOR("Gerard Garcia <ggarcia@deic.uab.cat>"); | |
163 | MODULE_DESCRIPTION("Vsock monitoring device. Based on nlmon device."); | |
164 | MODULE_ALIAS_RTNL_LINK("vsockmon"); |