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/* 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 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 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);
}
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