aboutsummaryrefslogtreecommitdiff
path: root/net/netfilter/xt_connbytes.c
blob: 1396fe2d07c14bc1b2f5ac0a0b15c444db597fd7 (plain)
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
172
173
174
175
176
177
178
179
180
181
182
183
/* Kernel module to match connection tracking byte counter.
 * GPL (C) 2002 Martin Devera (devik@cdi.cz).
 *
 * 2004-07-20 Harald Welte <laforge@netfilter.org>
 * 	- reimplemented to use per-connection accounting counters
 * 	- add functionality to match number of packets
 * 	- add functionality to match average packet size
 * 	- add support to match directions seperately
 * 2005-10-16 Harald Welte <laforge@netfilter.org>
 * 	- Port to x_tables
 *
 */
#include <linux/module.h>
#include <linux/skbuff.h>
#include <net/netfilter/nf_conntrack_compat.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_connbytes.h>

#include <asm/div64.h>
#include <asm/bitops.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("iptables match for matching number of pkts/bytes per connection");
MODULE_ALIAS("ipt_connbytes");

/* 64bit divisor, dividend and result. dynamic precision */
static u_int64_t div64_64(u_int64_t dividend, u_int64_t divisor)
{
	u_int32_t d = divisor;

	if (divisor > 0xffffffffULL) {
		unsigned int shift = fls(divisor >> 32);

		d = divisor >> shift;
		dividend >>= shift;
	}

	do_div(dividend, d);
	return dividend;
}

static int
match(const struct sk_buff *skb,
      const struct net_device *in,
      const struct net_device *out,
      const struct xt_match *match,
      const void *matchinfo,
      int offset,
      unsigned int protoff,
      int *hotdrop)
{
	const struct xt_connbytes_info *sinfo = matchinfo;
	u_int64_t what = 0;	/* initialize to make gcc happy */
	const struct ip_conntrack_counter *counters;

	if (!(counters = nf_ct_get_counters(skb)))
		return 0; /* no match */

	switch (sinfo->what) {
	case XT_CONNBYTES_PKTS:
		switch (sinfo->direction) {
		case XT_CONNBYTES_DIR_ORIGINAL:
			what = counters[IP_CT_DIR_ORIGINAL].packets;
			break;
		case XT_CONNBYTES_DIR_REPLY:
			what = counters[IP_CT_DIR_REPLY].packets;
			break;
		case XT_CONNBYTES_DIR_BOTH:
			what = counters[IP_CT_DIR_ORIGINAL].packets;
			what += counters[IP_CT_DIR_REPLY].packets;
			break;
		}
		break;
	case XT_CONNBYTES_BYTES:
		switch (sinfo->direction) {
		case XT_CONNBYTES_DIR_ORIGINAL:
			what = counters[IP_CT_DIR_ORIGINAL].bytes;
			break;
		case XT_CONNBYTES_DIR_REPLY:
			what = counters[IP_CT_DIR_REPLY].bytes;
			break;
		case XT_CONNBYTES_DIR_BOTH:
			what = counters[IP_CT_DIR_ORIGINAL].bytes;
			what += counters[IP_CT_DIR_REPLY].bytes;
			break;
		}
		break;
	case XT_CONNBYTES_AVGPKT:
		switch (sinfo->direction) {
		case XT_CONNBYTES_DIR_ORIGINAL:
			what = div64_64(counters[IP_CT_DIR_ORIGINAL].bytes,
					counters[IP_CT_DIR_ORIGINAL].packets);
			break;
		case XT_CONNBYTES_DIR_REPLY:
			what = div64_64(counters[IP_CT_DIR_REPLY].bytes,
					counters[IP_CT_DIR_REPLY].packets);
			break;
		case XT_CONNBYTES_DIR_BOTH:
			{
				u_int64_t bytes;
				u_int64_t pkts;
				bytes = counters[IP_CT_DIR_ORIGINAL].bytes +
					counters[IP_CT_DIR_REPLY].bytes;
				pkts = counters[IP_CT_DIR_ORIGINAL].packets+
					counters[IP_CT_DIR_REPLY].packets;

				/* FIXME_THEORETICAL: what to do if sum
				 * overflows ? */

				what = div64_64(bytes, pkts);
			}
			break;
		}
		break;
	}

	if (sinfo->count.to)
		return (what <= sinfo->count.to && what >= sinfo->count.from);
	else
		return (what >= sinfo->count.from);
}

static int check(const char *tablename,
		 const void *ip,
		 const struct xt_match *match,
		 void *matchinfo,
		 unsigned int matchsize,
		 unsigned int hook_mask)
{
	const struct xt_connbytes_info *sinfo = matchinfo;

	if (sinfo->what != XT_CONNBYTES_PKTS &&
	    sinfo->what != XT_CONNBYTES_BYTES &&
	    sinfo->what != XT_CONNBYTES_AVGPKT)
		return 0;

	if (sinfo->direction != XT_CONNBYTES_DIR_ORIGINAL &&
	    sinfo->direction != XT_CONNBYTES_DIR_REPLY &&
	    sinfo->direction != XT_CONNBYTES_DIR_BOTH)
		return 0;

	return 1;
}

static struct xt_match connbytes_match = {
	.name		= "connbytes",
	.match		= match,
	.checkentry	= check,
	.matchsize	= sizeof(struct xt_connbytes_info),
	.family		= AF_INET,
	.me		= THIS_MODULE
};
static struct xt_match connbytes6_match = {
	.name		= "connbytes",
	.match		= match,
	.checkentry	= check,
	.matchsize	= sizeof(struct xt_connbytes_info),
	.family		= AF_INET6,
	.me		= THIS_MODULE
};

static int __init xt_connbytes_init(void)
{
	int ret;
	ret = xt_register_match(&connbytes_match);
	if (ret)
		return ret;

	ret = xt_register_match(&connbytes6_match);
	if (ret)
		xt_unregister_match(&connbytes_match);
	return ret;
}

static void __exit xt_connbytes_fini(void)
{
	xt_unregister_match(&connbytes_match);
	xt_unregister_match(&connbytes6_match);
}

module_init(xt_connbytes_init);
module_exit(xt_connbytes_fini);