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
|
/*
Shared library add-on to iptables to add match support for the fuzzy match.
This file is distributed under the terms of the GNU General Public
License (GPL). Copies of the GPL can be obtained from:
ftp://prep.ai.mit.edu/pub/gnu/GPL
2002-08-07 Hime Aguiar e Oliveira Jr. <hime@engineer.com> : Initial version.
2003-04-08 Maciej Soltysiak <solt@dns.toxicfilms.tv> : IPv6 Port
2003-06-09 Hime Aguiar e Oliveira Jr. <hime@engineer.com> : Bug corrections in
the save function , thanks to information given by Jean-Francois Patenaude.
*/
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <getopt.h>
#include <ip6tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_ipv6/ip6t_fuzzy.h>
static void
help(void)
{
printf(
"fuzzy v%s options:\n"
" --lower-limit number (in packets per second)\n"
" --upper-limit number\n"
,IPTABLES_VERSION);
};
static struct option opts[] = {
{ "lower-limit", 1 , 0 , '1' } ,
{ "upper-limit", 1 , 0 , '2' } ,
{ 0 }
};
/* Initialize data structures */
static void
init(struct ip6t_entry_match *m, unsigned int *nfcache)
{
struct ip6t_fuzzy_info *presentinfo = (struct ip6t_fuzzy_info *)(m)->data;
*nfcache |= NFC_UNKNOWN;
/*
* Default rates ( I'll improve this very soon with something based
* on real statistics of the running machine ) .
*/
presentinfo->minimum_rate = 1000;
presentinfo->maximum_rate = 2000;
}
#define IP6T_FUZZY_OPT_MINIMUM 0x01
#define IP6T_FUZZY_OPT_MAXIMUM 0x02
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ip6t_entry *entry,
unsigned int *nfcache,
struct ip6t_entry_match **match)
{
struct ip6t_fuzzy_info *fuzzyinfo = (struct ip6t_fuzzy_info *)(*match)->data;
u_int32_t num;
switch (c) {
case '1':
if (invert)
exit_error(PARAMETER_PROBLEM,"Can't specify ! --lower-limit");
if (*flags & IP6T_FUZZY_OPT_MINIMUM)
exit_error(PARAMETER_PROBLEM,"Can't specify --lower-limit twice");
if (string_to_number(optarg,1,MAXFUZZYRATE,&num) == -1 || num < 1)
exit_error(PARAMETER_PROBLEM,"BAD --lower-limit");
fuzzyinfo->minimum_rate = num ;
*flags |= IP6T_FUZZY_OPT_MINIMUM;
break;
case '2':
if (invert)
exit_error(PARAMETER_PROBLEM,"Can't specify ! --upper-limit");
if (*flags & IP6T_FUZZY_OPT_MAXIMUM)
exit_error(PARAMETER_PROBLEM,"Can't specify --upper-limit twice");
if (string_to_number(optarg,1,MAXFUZZYRATE,&num) == -1 || num < 1)
exit_error(PARAMETER_PROBLEM,"BAD --upper-limit");
fuzzyinfo->maximum_rate = num ;
*flags |= IP6T_FUZZY_OPT_MAXIMUM;
break ;
default:
return 0;
}
return 1;
}
static void final_check(unsigned int flags)
{
}
static void
print(const struct ip6t_ip6 *ipv6,
const struct ip6t_entry_match *match,
int numeric)
{
const struct ip6t_fuzzy_info *fuzzyinfo
= (const struct ip6t_fuzzy_info *)match->data;
printf(" fuzzy: lower limit = %u pps - upper limit = %u pps ",fuzzyinfo->minimum_rate,fuzzyinfo->maximum_rate);
}
/* Saves the union ip6t_targinfo in parsable form to stdout. */
static void
save(const struct ip6t_ip6 *ipv6, const struct ip6t_entry_match *match)
{
const struct ip6t_fuzzy_info *fuzzyinfo
= (const struct ip6t_fuzzy_info *)match->data;
printf("--lower-limit %u ",fuzzyinfo->minimum_rate);
printf("--upper-limit %u ",fuzzyinfo->maximum_rate);
}
struct ip6tables_match fuzzy_match
= { NULL,
"fuzzy",
IPTABLES_VERSION,
IP6T_ALIGN(sizeof(struct ip6t_fuzzy_info)),
IP6T_ALIGN(sizeof(struct ip6t_fuzzy_info)),
&help,
&init,
&parse,
&final_check,
&print,
&save,
opts
};
void _init(void)
{
register_match6(&fuzzy_match);
}
|
