summaryrefslogtreecommitdiffstats
blob: b6ce06aabb43032bfdbcc8240449856d0f25aa8a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
/**
 * Copyright (C) ARM Limited 2010-2012. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 */

#include "gator.h"
#include <linux/netdevice.h>
#include <linux/hardirq.h>

#define NETRX		0
#define NETTX		1
#define TOTALNET	2

static ulong netrx_enabled;
static ulong nettx_enabled;
static ulong netrx_key;
static ulong nettx_key;
static int rx_total, tx_total;
static ulong netPrev[TOTALNET];
static int netGet[TOTALNET * 4];

static struct timer_list net_wake_up_timer;

// Must be run in process context as the kernel function dev_get_stats() can sleep
static void get_network_stats(struct work_struct *wsptr)
{
	int rx = 0, tx = 0;
	struct net_device *dev;

	for_each_netdev(&init_net, dev) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
		const struct net_device_stats *stats = dev_get_stats(dev);
#else
		struct rtnl_link_stats64 temp;
		const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
#endif
		rx += stats->rx_bytes;
		tx += stats->tx_bytes;
	}
	rx_total = rx;
	tx_total = tx;
}

DECLARE_WORK(wq_get_stats, get_network_stats);

static void net_wake_up_handler(unsigned long unused_data)
{
	// had to delay scheduling work as attempting to schedule work during the context switch is illegal in kernel versions 3.5 and greater
	schedule_work(&wq_get_stats);
}

static void calculate_delta(int *rx, int *tx)
{
	int rx_calc, tx_calc;

	rx_calc = (int)(rx_total - netPrev[NETRX]);
	if (rx_calc < 0)
		rx_calc = 0;
	netPrev[NETRX] += rx_calc;

	tx_calc = (int)(tx_total - netPrev[NETTX]);
	if (tx_calc < 0)
		tx_calc = 0;
	netPrev[NETTX] += tx_calc;

	*rx = rx_calc;
	*tx = tx_calc;
}

static int gator_events_net_create_files(struct super_block *sb, struct dentry *root)
{
	struct dentry *dir;

	dir = gatorfs_mkdir(sb, root, "Linux_net_rx");
	if (!dir) {
		return -1;
	}
	gatorfs_create_ulong(sb, dir, "enabled", &netrx_enabled);
	gatorfs_create_ro_ulong(sb, dir, "key", &netrx_key);

	dir = gatorfs_mkdir(sb, root, "Linux_net_tx");
	if (!dir) {
		return -1;
	}
	gatorfs_create_ulong(sb, dir, "enabled", &nettx_enabled);
	gatorfs_create_ro_ulong(sb, dir, "key", &nettx_key);

	return 0;
}

static int gator_events_net_start(void)
{
	get_network_stats(0);
	netPrev[NETRX] = rx_total;
	netPrev[NETTX] = tx_total;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
	setup_timer(&net_wake_up_timer, net_wake_up_handler, 0);
#else
	setup_deferrable_timer_on_stack(&net_wake_up_timer, net_wake_up_handler, 0);
#endif
	return 0;
}

static void gator_events_net_stop(void)
{
	del_timer_sync(&net_wake_up_timer);
	netrx_enabled = 0;
	nettx_enabled = 0;
}

static int gator_events_net_read(int **buffer)
{
	int len, rx_delta, tx_delta;
	static int last_rx_delta = 0, last_tx_delta = 0;

	if (smp_processor_id() != 0)
		return 0;

	if (!netrx_enabled && !nettx_enabled)
		return 0;

	mod_timer(&net_wake_up_timer, jiffies + 1);

	calculate_delta(&rx_delta, &tx_delta);

	len = 0;
	if (netrx_enabled && last_rx_delta != rx_delta) {
		last_rx_delta = rx_delta;
		netGet[len++] = netrx_key;
		netGet[len++] = 0;	// indicates to Streamline that rx_delta bytes were transmitted now, not since the last message
		netGet[len++] = netrx_key;
		netGet[len++] = rx_delta;
	}

	if (nettx_enabled && last_tx_delta != tx_delta) {
		last_tx_delta = tx_delta;
		netGet[len++] = nettx_key;
		netGet[len++] = 0;	// indicates to Streamline that tx_delta bytes were transmitted now, not since the last message
		netGet[len++] = nettx_key;
		netGet[len++] = tx_delta;
	}

	if (buffer)
		*buffer = netGet;

	return len;
}

static struct gator_interface gator_events_net_interface = {
	.create_files = gator_events_net_create_files,
	.start = gator_events_net_start,
	.stop = gator_events_net_stop,
	.read = gator_events_net_read,
};

int gator_events_net_init(void)
{
	netrx_key = gator_events_get_key();
	nettx_key = gator_events_get_key();

	netrx_enabled = 0;
	nettx_enabled = 0;

	return gator_events_install(&gator_events_net_interface);
}

gator_events_init(gator_events_net_init);