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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
/* Shared library add-on to iptables to add byte tracking support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/netfilter/xt_connbytes.h>
static void connbytes_help(void)
{
printf(
"connbytes match options:\n"
" [!] --connbytes from:[to]\n"
" --connbytes-dir [original, reply, both]\n"
" --connbytes-mode [packets, bytes, avgpkt]\n");
}
static const struct option connbytes_opts[] = {
{ "connbytes", 1, NULL, '1' },
{ "connbytes-dir", 1, NULL, '2' },
{ "connbytes-mode", 1, NULL, '3' },
{ .name = NULL }
};
static void
parse_range(const char *arg, struct xt_connbytes_info *si)
{
char *colon,*p;
si->count.from = strtoul(arg,&colon,10);
if (*colon != ':')
xtables_error(PARAMETER_PROBLEM, "Bad range \"%s\"", arg);
si->count.to = strtoul(colon+1,&p,10);
if (p == colon+1) {
/* second number omited */
si->count.to = 0xffffffff;
}
if (si->count.from > si->count.to)
xtables_error(PARAMETER_PROBLEM, "%llu should be less than %llu",
(unsigned long long)si->count.from,
(unsigned long long)si->count.to);
}
static int
connbytes_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_connbytes_info *sinfo = (struct xt_connbytes_info *)(*match)->data;
unsigned long i;
switch (c) {
case '1':
if (xtables_check_inverse(optarg, &invert, &optind, 0, argv))
optind++;
parse_range(optarg, sinfo);
if (invert) {
i = sinfo->count.from;
sinfo->count.from = sinfo->count.to;
sinfo->count.to = i;
}
*flags |= 1;
break;
case '2':
if (!strcmp(optarg, "original"))
sinfo->direction = XT_CONNBYTES_DIR_ORIGINAL;
else if (!strcmp(optarg, "reply"))
sinfo->direction = XT_CONNBYTES_DIR_REPLY;
else if (!strcmp(optarg, "both"))
sinfo->direction = XT_CONNBYTES_DIR_BOTH;
else
xtables_error(PARAMETER_PROBLEM,
"Unknown --connbytes-dir `%s'", optarg);
*flags |= 2;
break;
case '3':
if (!strcmp(optarg, "packets"))
sinfo->what = XT_CONNBYTES_PKTS;
else if (!strcmp(optarg, "bytes"))
sinfo->what = XT_CONNBYTES_BYTES;
else if (!strcmp(optarg, "avgpkt"))
sinfo->what = XT_CONNBYTES_AVGPKT;
else
xtables_error(PARAMETER_PROBLEM,
"Unknown --connbytes-mode `%s'", optarg);
*flags |= 4;
break;
default:
return 0;
}
return 1;
}
static void connbytes_check(unsigned int flags)
{
if (flags != 7)
xtables_error(PARAMETER_PROBLEM, "You must specify `--connbytes'"
"`--connbytes-dir' and `--connbytes-mode'");
}
static void print_mode(const struct xt_connbytes_info *sinfo)
{
switch (sinfo->what) {
case XT_CONNBYTES_PKTS:
fputs("packets ", stdout);
break;
case XT_CONNBYTES_BYTES:
fputs("bytes ", stdout);
break;
case XT_CONNBYTES_AVGPKT:
fputs("avgpkt ", stdout);
break;
default:
fputs("unknown ", stdout);
break;
}
}
static void print_direction(const struct xt_connbytes_info *sinfo)
{
switch (sinfo->direction) {
case XT_CONNBYTES_DIR_ORIGINAL:
fputs("original ", stdout);
break;
case XT_CONNBYTES_DIR_REPLY:
fputs("reply ", stdout);
break;
case XT_CONNBYTES_DIR_BOTH:
fputs("both ", stdout);
break;
default:
fputs("unknown ", stdout);
break;
}
}
static void
connbytes_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_connbytes_info *sinfo = (const void *)match->data;
if (sinfo->count.from > sinfo->count.to)
printf("connbytes ! %llu:%llu ",
(unsigned long long)sinfo->count.to,
(unsigned long long)sinfo->count.from);
else
printf("connbytes %llu:%llu ",
(unsigned long long)sinfo->count.from,
(unsigned long long)sinfo->count.to);
fputs("connbytes mode ", stdout);
print_mode(sinfo);
fputs("connbytes direction ", stdout);
print_direction(sinfo);
}
static void connbytes_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_connbytes_info *sinfo = (const void *)match->data;
if (sinfo->count.from > sinfo->count.to)
printf("! --connbytes %llu:%llu ",
(unsigned long long)sinfo->count.to,
(unsigned long long)sinfo->count.from);
else
printf("--connbytes %llu:%llu ",
(unsigned long long)sinfo->count.from,
(unsigned long long)sinfo->count.to);
fputs("--connbytes-mode ", stdout);
print_mode(sinfo);
fputs("--connbytes-dir ", stdout);
print_direction(sinfo);
}
static struct xtables_match connbytes_match = {
.family = NFPROTO_UNSPEC,
.name = "connbytes",
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_connbytes_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_connbytes_info)),
.help = connbytes_help,
.parse = connbytes_parse,
.final_check = connbytes_check,
.print = connbytes_print,
.save = connbytes_save,
.extra_opts = connbytes_opts,
};
void _init(void)
{
xtables_register_match(&connbytes_match);
}
|
