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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 <xtables.h>
#include <linux/netfilter/xt_dscp.h>
/* This is evil, but it's my code - HW*/
#include "dscp_helper.c"
enum {
O_DSCP = 0,
O_DSCP_CLASS,
F_DSCP = 1 << O_DSCP,
F_DSCP_CLASS = 1 << O_DSCP_CLASS,
};
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 xt_option_entry dscp_opts[] = {
{.name = "dscp", .id = O_DSCP, .excl = F_DSCP_CLASS,
.type = XTTYPE_UINT8, .min = 0, .max = XT_DSCP_MAX,
.flags = XTOPT_INVERT | XTOPT_PUT,
XTOPT_POINTER(struct xt_dscp_info, dscp)},
{.name = "dscp-class", .id = O_DSCP_CLASS, .excl = F_DSCP,
.type = XTTYPE_STRING, .flags = XTOPT_INVERT},
XTOPT_TABLEEND,
};
static void dscp_parse(struct xt_option_call *cb)
{
struct xt_dscp_info *dinfo = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_DSCP:
if (cb->invert)
dinfo->invert = 1;
break;
case O_DSCP_CLASS:
dinfo->dscp = class_to_dscp(cb->arg);
if (cb->invert)
dinfo->invert = 1;
break;
}
}
static void dscp_check(struct xt_fcheck_call *cb)
{
if (cb->xflags == 0)
xtables_error(PARAMETER_PROBLEM,
"DSCP match: Parameter --dscp is required");
}
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 %s0x%02x", dinfo->invert ? "!" : "", dinfo->dscp);
}
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("%s --dscp 0x%02x", dinfo->invert ? " !" : "", dinfo->dscp);
}
static struct xtables_match dscp_match = {
.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,
.print = dscp_print,
.save = dscp_save,
.x6_parse = dscp_parse,
.x6_fcheck = dscp_check,
.x6_options = dscp_opts,
};
void _init(void)
{
xtables_register_match(&dscp_match);
}
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