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
|
/*
* Shared library add-on to iptables to add early socket matching support.
*
* Copyright (C) 2007 BalaBit IT Ltd.
*/
#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter/xt_socket.h>
enum {
O_TRANSPARENT = 0,
O_NOWILDCARD = 1,
};
static const struct xt_option_entry socket_mt_opts[] = {
{.name = "transparent", .id = O_TRANSPARENT, .type = XTTYPE_NONE},
XTOPT_TABLEEND,
};
static const struct xt_option_entry socket_mt_opts_v2[] = {
{.name = "transparent", .id = O_TRANSPARENT, .type = XTTYPE_NONE},
{.name = "nowildcard", .id = O_NOWILDCARD, .type = XTTYPE_NONE},
XTOPT_TABLEEND,
};
static void socket_mt_help(void)
{
printf(
"socket match options:\n"
" --transparent Ignore non-transparent sockets\n\n");
}
static void socket_mt_help_v2(void)
{
printf(
"socket match options:\n"
" --nowildcard Do not ignore LISTEN sockets bound on INADDR_ANY\n"
" --transparent Ignore non-transparent sockets\n\n");
}
static void socket_mt_parse(struct xt_option_call *cb)
{
struct xt_socket_mtinfo1 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_TRANSPARENT:
info->flags |= XT_SOCKET_TRANSPARENT;
break;
}
}
static void socket_mt_parse_v2(struct xt_option_call *cb)
{
struct xt_socket_mtinfo2 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_TRANSPARENT:
info->flags |= XT_SOCKET_TRANSPARENT;
break;
case O_NOWILDCARD:
info->flags |= XT_SOCKET_NOWILDCARD;
break;
}
}
static void
socket_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_socket_mtinfo1 *info = (const void *)match->data;
if (info->flags & XT_SOCKET_TRANSPARENT)
printf(" --transparent");
}
static void
socket_mt_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf(" socket");
socket_mt_save(ip, match);
}
static void
socket_mt_save_v2(const void *ip, const struct xt_entry_match *match)
{
const struct xt_socket_mtinfo2 *info = (const void *)match->data;
if (info->flags & XT_SOCKET_TRANSPARENT)
printf(" --transparent");
if (info->flags & XT_SOCKET_NOWILDCARD)
printf(" --nowildcard");
}
static void
socket_mt_print_v2(const void *ip, const struct xt_entry_match *match,
int numeric)
{
printf(" socket");
socket_mt_save_v2(ip, match);
}
static struct xtables_match socket_mt_reg[] = {
{
.name = "socket",
.revision = 0,
.family = NFPROTO_IPV4,
.version = XTABLES_VERSION,
.size = XT_ALIGN(0),
.userspacesize = XT_ALIGN(0),
},
{
.name = "socket",
.revision = 1,
.family = NFPROTO_UNSPEC,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_socket_mtinfo1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_socket_mtinfo1)),
.help = socket_mt_help,
.print = socket_mt_print,
.save = socket_mt_save,
.x6_parse = socket_mt_parse,
.x6_options = socket_mt_opts,
},
{
.name = "socket",
.revision = 2,
.family = NFPROTO_UNSPEC,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_socket_mtinfo2)),
.userspacesize = XT_ALIGN(sizeof(struct xt_socket_mtinfo2)),
.help = socket_mt_help_v2,
.print = socket_mt_print_v2,
.save = socket_mt_save_v2,
.x6_parse = socket_mt_parse_v2,
.x6_options = socket_mt_opts_v2,
},
};
void _init(void)
{
xtables_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
}
|
