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
|
/*
* shared library add-on to iptables to add TPROXY target support.
*
* Copyright (C) 2002-2008 BalaBit IT Ltd.
*/
#include <stdio.h>
#include <limits.h>
#include <xtables.h>
#include <linux/netfilter/xt_TPROXY.h>
#include <arpa/inet.h>
enum {
P_PORT = 0,
P_ADDR,
P_MARK,
F_PORT = 1 << P_PORT,
F_ADDR = 1 << P_ADDR,
F_MARK = 1 << P_MARK,
};
#define s struct xt_tproxy_target_info
static const struct xt_option_entry tproxy_tg0_opts[] = {
{.name = "on-port", .id = P_PORT, .type = XTTYPE_PORT_NE,
.flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, lport)},
{.name = "on-ip", .id = P_ADDR, .type = XTTYPE_ONEHOST},
{.name = "tproxy-mark", .id = P_MARK, .type = XTTYPE_MARKMASK32},
XTOPT_TABLEEND,
};
#undef s
#define s struct xt_tproxy_target_info_v1
static const struct xt_option_entry tproxy_tg1_opts[] = {
{.name = "on-port", .id = P_PORT, .type = XTTYPE_PORT_NE,
.flags = XTOPT_MAND | XTOPT_PUT, XTOPT_POINTER(s, lport)},
{.name = "on-ip", .id = P_ADDR, .type = XTTYPE_ONEHOST,
.flags = XTOPT_PUT, XTOPT_POINTER(s, laddr)},
{.name = "tproxy-mark", .id = P_MARK, .type = XTTYPE_MARKMASK32},
XTOPT_TABLEEND,
};
#undef s
static void tproxy_tg_help(void)
{
printf(
"TPROXY target options:\n"
" --on-port port Redirect connection to port, or the original port if 0\n"
" --on-ip ip Optionally redirect to the given IP\n"
" --tproxy-mark value[/mask] Mark packets with the given value/mask\n\n");
}
static void tproxy_tg_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_tproxy_target_info *info = (const void *)target->data;
printf(" TPROXY redirect %s:%u mark 0x%x/0x%x",
xtables_ipaddr_to_numeric((const struct in_addr *)&info->laddr),
ntohs(info->lport), (unsigned int)info->mark_value,
(unsigned int)info->mark_mask);
}
static void
tproxy_tg_print4(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_tproxy_target_info_v1 *info =
(const void *)target->data;
printf(" TPROXY redirect %s:%u mark 0x%x/0x%x",
xtables_ipaddr_to_numeric(&info->laddr.in),
ntohs(info->lport), (unsigned int)info->mark_value,
(unsigned int)info->mark_mask);
}
static void
tproxy_tg_print6(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_tproxy_target_info_v1 *info =
(const void *)target->data;
printf(" TPROXY redirect %s:%u mark 0x%x/0x%x",
xtables_ip6addr_to_numeric(&info->laddr.in6),
ntohs(info->lport), (unsigned int)info->mark_value,
(unsigned int)info->mark_mask);
}
static void tproxy_tg_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_tproxy_target_info *info = (const void *)target->data;
printf(" --on-port %u", ntohs(info->lport));
printf(" --on-ip %s",
xtables_ipaddr_to_numeric((const struct in_addr *)&info->laddr));
printf(" --tproxy-mark 0x%x/0x%x",
(unsigned int)info->mark_value, (unsigned int)info->mark_mask);
}
static void
tproxy_tg_save4(const void *ip, const struct xt_entry_target *target)
{
const struct xt_tproxy_target_info_v1 *info;
info = (const void *)target->data;
printf(" --on-port %u", ntohs(info->lport));
printf(" --on-ip %s", xtables_ipaddr_to_numeric(&info->laddr.in));
printf(" --tproxy-mark 0x%x/0x%x",
(unsigned int)info->mark_value, (unsigned int)info->mark_mask);
}
static void
tproxy_tg_save6(const void *ip, const struct xt_entry_target *target)
{
const struct xt_tproxy_target_info_v1 *info;
info = (const void *)target->data;
printf(" --on-port %u", ntohs(info->lport));
printf(" --on-ip %s", xtables_ip6addr_to_numeric(&info->laddr.in6));
printf(" --tproxy-mark 0x%x/0x%x",
(unsigned int)info->mark_value, (unsigned int)info->mark_mask);
}
static void tproxy_tg0_parse(struct xt_option_call *cb)
{
struct xt_tproxy_target_info *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case P_MARK:
info->mark_value = cb->val.mark;
info->mark_mask = cb->val.mask;
break;
case P_ADDR:
info->laddr = cb->val.inetaddr.ip;
break;
}
}
static void tproxy_tg1_parse(struct xt_option_call *cb)
{
struct xt_tproxy_target_info_v1 *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case P_MARK:
info->mark_value = cb->val.mark;
info->mark_mask = cb->val.mask;
break;
}
}
static struct xtables_target tproxy_tg_reg[] = {
{
.name = "TPROXY",
.revision = 0,
.family = NFPROTO_IPV4,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_tproxy_target_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tproxy_target_info)),
.help = tproxy_tg_help,
.print = tproxy_tg_print,
.save = tproxy_tg_save,
.x6_options = tproxy_tg0_opts,
.x6_parse = tproxy_tg0_parse,
},
{
.name = "TPROXY",
.revision = 1,
.family = NFPROTO_IPV4,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)),
.help = tproxy_tg_help,
.print = tproxy_tg_print4,
.save = tproxy_tg_save4,
.x6_options = tproxy_tg1_opts,
.x6_parse = tproxy_tg1_parse,
},
{
.name = "TPROXY",
.revision = 1,
.family = NFPROTO_IPV6,
.version = XTABLES_VERSION,
.size = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tproxy_target_info_v1)),
.help = tproxy_tg_help,
.print = tproxy_tg_print6,
.save = tproxy_tg_save6,
.x6_options = tproxy_tg1_opts,
.x6_parse = tproxy_tg1_parse,
},
};
void _init(void)
{
xtables_register_targets(tproxy_tg_reg, ARRAY_SIZE(tproxy_tg_reg));
}
|
