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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 <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);
}
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