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/* Shared library add-on to iptables for DSCP
*
* (C) 2002 by 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
*
* --class support added by Iain Barnes
*
* For a list of DSCP codepoints see
* http://www.iana.org/assignments/dscp-registry
*
*/
#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 match options\n"
"[!] --dscp value Match DSCP codepoint with numerical value\n"
" This value can be in decimal (ex: 32)\n"
" or in hex (ex: 0x20)\n"
"[!] --dscp-class name Match the DiffServ class. This value may\n"
" be any of the BE,EF, AFxx or CSx classes\n"
"\n"
" These two options are mutually exclusive !\n");
}
static const struct option dscp_opts[] = {
{ "dscp", 1, NULL, 'F' },
{ "dscp-class", 1, NULL, 'G' },
{ .name = NULL }
};
static void
parse_dscp(const char *s, struct xt_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 > XT_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 xt_dscp_info *dinfo)
{
unsigned int dscp = class_to_dscp(s);
/* Assign the value */
dinfo->dscp = (u_int8_t)dscp;
}
static int
dscp_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_dscp_info *dinfo
= (struct xt_dscp_info *)(*match)->data;
switch (c) {
case 'F':
if (*flags)
exit_error(PARAMETER_PROBLEM,
"DSCP match: Only use --dscp ONCE!");
check_inverse(optarg, &invert, &optind, 0);
parse_dscp(argv[optind-1], dinfo);
if (invert)
dinfo->invert = 1;
*flags = 1;
break;
case 'G':
if (*flags)
exit_error(PARAMETER_PROBLEM,
"DSCP match: Only use --dscp-class ONCE!");
check_inverse(optarg, &invert, &optind, 0);
parse_class(argv[optind - 1], dinfo);
if (invert)
dinfo->invert = 1;
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void dscp_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"DSCP match: Parameter --dscp is required");
}
static void
print_dscp(u_int8_t dscp, int invert, int numeric)
{
if (invert)
fputc('!', stdout);
printf("0x%02x ", dscp);
}
/* Prints out the matchinfo. */
static void
dscp_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
const struct xt_dscp_info *dinfo =
(const struct xt_dscp_info *)match->data;
printf("DSCP match ");
print_dscp(dinfo->dscp, dinfo->invert, numeric);
}
/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void dscp_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_dscp_info *dinfo =
(const struct xt_dscp_info *)match->data;
printf("--dscp ");
print_dscp(dinfo->dscp, dinfo->invert, 1);
}
static struct xtables_match dscp_match = {
.family = AF_INET,
.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,
};
static struct xtables_match dscp_match6 = {
.family = AF_INET6,
.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_match(&dscp_match);
xtables_register_match(&dscp_match6);
}
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