summaryrefslogtreecommitdiffstats
path: root/extensions/libxt_DSCP.c
blob: db27d68f0b0ce6b5bed414b2b20884d7fb5d277a (plain)
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
/* 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 <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>

#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_DSCP.h>

/* This is evil, but it's my code - HW*/
#include "dscp_helper.c"

static void DSCP_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 const struct option DSCP_opts[] = {
	{.name = "set-dscp",       .has_arg = true, .val = 'F'},
	{.name = "set-dscp-class", .has_arg = true, .val = 'G'},
	XT_GETOPT_TABLEEND,
};

static void
parse_dscp(const char *s, struct xt_DSCP_info *dinfo)
{
	unsigned int dscp;
       
	if (!xtables_strtoui(s, NULL, &dscp, 0, UINT8_MAX))
		xtables_error(PARAMETER_PROBLEM,
			   "Invalid dscp `%s'\n", s);

	if (dscp > XT_DSCP_MAX)
		xtables_error(PARAMETER_PROBLEM,
			   "DSCP `%d` out of range\n", dscp);

	dinfo->dscp = dscp;
}


static void
parse_class(const char *s, struct xt_DSCP_info *dinfo)
{
	unsigned int dscp = class_to_dscp(s);

	/* Assign the value */
	dinfo->dscp = dscp;
}


static int DSCP_parse(int c, char **argv, int invert, unsigned int *flags,
                      const void *entry, struct xt_entry_target **target)
{
	struct xt_DSCP_info *dinfo
		= (struct xt_DSCP_info *)(*target)->data;

	switch (c) {
	case 'F':
		if (*flags)
			xtables_error(PARAMETER_PROBLEM,
			           "DSCP target: Only use --set-dscp ONCE!");
		parse_dscp(optarg, dinfo);
		*flags = 1;
		break;
	case 'G':
		if (*flags)
			xtables_error(PARAMETER_PROBLEM,
				   "DSCP target: Only use --set-dscp-class ONCE!");
		parse_class(optarg, dinfo);
		*flags = 1;
		break;
	}

	return 1;
}

static void DSCP_check(unsigned int flags)
{
	if (!flags)
		xtables_error(PARAMETER_PROBLEM,
		           "DSCP target: Parameter --set-dscp is required");
}

static void
print_dscp(uint8_t dscp, int numeric)
{
	printf(" 0x%02x", dscp);
}

static void DSCP_print(const void *ip, const struct xt_entry_target *target,
                       int numeric)
{
	const struct xt_DSCP_info *dinfo =
		(const struct xt_DSCP_info *)target->data;
	printf(" DSCP set");
	print_dscp(dinfo->dscp, numeric);
}

static void DSCP_save(const void *ip, const struct xt_entry_target *target)
{
	const struct xt_DSCP_info *dinfo =
		(const struct xt_DSCP_info *)target->data;

	printf(" --set-dscp 0x%02x", dinfo->dscp);
}

static struct xtables_target dscp_target = {
	.family		= NFPROTO_UNSPEC,
	.name		= "DSCP",
	.version	= XTABLES_VERSION,
	.size		= XT_ALIGN(sizeof(struct xt_DSCP_info)),
	.userspacesize	= XT_ALIGN(sizeof(struct xt_DSCP_info)),
	.help		= DSCP_help,
	.parse		= DSCP_parse,
	.final_check	= DSCP_check,
	.print		= DSCP_print,
	.save		= DSCP_save,
	.extra_opts	= DSCP_opts,
};

void _init(void)
{
	xtables_register_target(&dscp_target);
}