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
|
/* Shared library add-on to iptables for DSCP
*
* (C) 2000- 2002 by Matthew G. Marsh <mgm@paktronix.com>,
* Harald Welte <laforge@gnumonks.org>
*
* This program is distributed under the terms of GNU GPL v2, 1991
*
* libipt_DSCP.c borrowed heavily from libipt_TOS.c
*
* --set-class added by Iain Barnes
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_DSCP.h>
/* This is evil, but it's my code - HW*/
#include "libipt_dscp_helper.c"
static void init(struct ipt_entry_target *t, unsigned int *nfcache)
{
}
static void help(void)
{
printf(
"DSCP target options\n"
" --set-dscp value Set DSCP field in packet header to value\n"
" This value can be in decimal (ex: 32)\n"
" or in hex (ex: 0x20)\n"
" --set-dscp-class class Set the DSCP field in packet header to the\n"
" value represented by the DiffServ class value.\n"
" This class may be EF,BE or any of the CSxx\n"
" or AFxx classes.\n"
"\n"
" These two options are mutually exclusive !\n"
);
}
static struct option opts[] = {
{ "set-dscp", 1, 0, 'F' },
{ "set-dscp-class", 1, 0, 'G' },
{ 0 }
};
static void
parse_dscp(const unsigned char *s, struct ipt_DSCP_info *dinfo)
{
unsigned int dscp;
if (string_to_number(s, 0, 255, &dscp) == -1)
exit_error(PARAMETER_PROBLEM,
"Invalid dscp `%s'\n", s);
if (dscp > IPT_DSCP_MAX)
exit_error(PARAMETER_PROBLEM,
"DSCP `%d` out of range\n", dscp);
dinfo->dscp = (u_int8_t )dscp;
return;
}
static void
parse_class(const unsigned char *s, struct ipt_DSCP_info *dinfo)
{
unsigned int dscp = class_to_dscp(s);
/* Assign the value */
dinfo->dscp = (u_int8_t)dscp;
}
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry,
struct ipt_entry_target **target)
{
struct ipt_DSCP_info *dinfo
= (struct ipt_DSCP_info *)(*target)->data;
switch (c) {
case 'F':
if (*flags)
exit_error(PARAMETER_PROBLEM,
"DSCP target: Only use --set-dscp ONCE!");
parse_dscp(optarg, dinfo);
*flags = 1;
break;
case 'G':
if (*flags)
exit_error(PARAMETER_PROBLEM,
"DSCP target: Only use --set-dscp-class ONCE!");
parse_class(optarg, dinfo);
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"DSCP target: Parameter --set-dscp is required");
}
static void
print_dscp(u_int8_t dscp, int numeric)
{
printf("0x%02x ", dscp);
}
/* Prints out the targinfo. */
static void
print(const struct ipt_ip *ip,
const struct ipt_entry_target *target,
int numeric)
{
const struct ipt_DSCP_info *dinfo =
(const struct ipt_DSCP_info *)target->data;
printf("DSCP set ");
print_dscp(dinfo->dscp, numeric);
}
/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
{
const struct ipt_DSCP_info *dinfo =
(const struct ipt_DSCP_info *)target->data;
printf("--set-dscp 0x%02x ", dinfo->dscp);
}
static struct iptables_target dscp = {
.next = NULL,
.name = "DSCP",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_DSCP_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_DSCP_info)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_target(&dscp);
}
|
