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/*
* Shared library add-on to iptables to add TOS target support
*
* Copyright © CC Computer Consultants GmbH, 2007
* Contact: Jan Engelhardt <jengelh@medozas.de>
*/
#include <getopt.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <xtables.h>
#include <linux/netfilter/xt_DSCP.h>
#include "tos_values.c"
struct ipt_tos_target_info {
uint8_t tos;
};
enum {
O_SET_TOS = 0,
O_AND_TOS,
O_OR_TOS,
O_XOR_TOS,
F_SET_TOS = 1 << O_SET_TOS,
F_AND_TOS = 1 << O_AND_TOS,
F_OR_TOS = 1 << O_OR_TOS,
F_XOR_TOS = 1 << O_XOR_TOS,
F_ANY = F_SET_TOS | F_AND_TOS | F_OR_TOS | F_XOR_TOS,
};
static const struct xt_option_entry tos_tg_opts_v0[] = {
{.name = "set-tos", .id = O_SET_TOS, .type = XTTYPE_TOSMASK,
.excl = F_ANY, .max = 0xFF},
XTOPT_TABLEEND,
};
static const struct xt_option_entry tos_tg_opts[] = {
{.name = "set-tos", .id = O_SET_TOS, .type = XTTYPE_TOSMASK,
.excl = F_ANY, .max = 0x3F},
{.name = "and-tos", .id = O_AND_TOS, .type = XTTYPE_UINT8,
.excl = F_ANY},
{.name = "or-tos", .id = O_OR_TOS, .type = XTTYPE_UINT8,
.excl = F_ANY},
{.name = "xor-tos", .id = O_XOR_TOS, .type = XTTYPE_UINT8,
.excl = F_ANY},
XTOPT_TABLEEND,
};
static void tos_tg_help_v0(void)
{
const struct tos_symbol_info *symbol;
printf(
"TOS target options:\n"
" --set-tos value Set Type of Service/Priority field to value\n"
" --set-tos symbol Set TOS field (IPv4 only) by symbol\n"
" Accepted symbolic names for value are:\n");
for (symbol = tos_symbol_names; symbol->name != NULL; ++symbol)
printf(" (0x%02x) %2u %s\n",
symbol->value, symbol->value, symbol->name);
printf("\n");
}
static void tos_tg_help(void)
{
const struct tos_symbol_info *symbol;
printf(
"TOS target v%s options:\n"
" --set-tos value[/mask] Set Type of Service/Priority field to value\n"
" (Zero out bits in mask and XOR value into TOS)\n"
" --set-tos symbol Set TOS field (IPv4 only) by symbol\n"
" (this zeroes the 4-bit Precedence part!)\n"
" Accepted symbolic names for value are:\n",
XTABLES_VERSION);
for (symbol = tos_symbol_names; symbol->name != NULL; ++symbol)
printf(" (0x%02x) %2u %s\n",
symbol->value, symbol->value, symbol->name);
printf(
"\n"
" --and-tos bits Binary AND the TOS value with bits\n"
" --or-tos bits Binary OR the TOS value with bits\n"
" --xor-tos bits Binary XOR the TOS value with bits\n"
);
}
static void tos_tg_parse_v0(struct xt_option_call *cb)
{
struct ipt_tos_target_info *info = cb->data;
xtables_option_parse(cb);
if (cb->val.tos_mask != 0xFF)
xtables_error(PARAMETER_PROBLEM, "tos match: Your kernel "
"is too old to support anything besides "
"/0xFF as a mask.");
info->tos = cb->val.tos_value;
}
static void tos_tg_parse(struct xt_option_call *cb)
{
struct xt_tos_target_info *info = cb->data;
xtables_option_parse(cb);
switch (cb->entry->id) {
case O_SET_TOS:
info->tos_value = cb->val.tos_value;
info->tos_mask = cb->val.tos_mask;
break;
case O_AND_TOS:
info->tos_value = 0;
info->tos_mask = ~cb->val.u8;
break;
case O_OR_TOS:
info->tos_value = cb->val.u8;
info->tos_mask = cb->val.u8;
break;
case O_XOR_TOS:
info->tos_value = cb->val.u8;
info->tos_mask = 0;
break;
}
}
static void tos_tg_check(struct xt_fcheck_call *cb)
{
if (!(cb->xflags & F_ANY))
xtables_error(PARAMETER_PROBLEM,
"TOS: An action is required");
}
static void tos_tg_print_v0(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct ipt_tos_target_info *info = (const void *)target->data;
printf(" TOS set ");
if (numeric || !tos_try_print_symbolic("", info->tos, 0xFF))
printf("0x%02x", info->tos);
}
static void tos_tg_print(const void *ip, const struct xt_entry_target *target,
int numeric)
{
const struct xt_tos_target_info *info = (const void *)target->data;
if (numeric)
printf(" TOS set 0x%02x/0x%02x",
info->tos_value, info->tos_mask);
else if (tos_try_print_symbolic(" TOS set",
info->tos_value, info->tos_mask))
/* already printed by call */
return;
else if (info->tos_value == 0)
printf(" TOS and 0x%02x",
(unsigned int)(uint8_t)~info->tos_mask);
else if (info->tos_value == info->tos_mask)
printf(" TOS or 0x%02x", info->tos_value);
else if (info->tos_mask == 0)
printf(" TOS xor 0x%02x", info->tos_value);
else
printf(" TOS set 0x%02x/0x%02x",
info->tos_value, info->tos_mask);
}
static void tos_tg_save_v0(const void *ip, const struct xt_entry_target *target)
{
const struct ipt_tos_target_info *info = (const void *)target->data;
printf(" --set-tos 0x%02x", info->tos);
}
static void tos_tg_save(const void *ip, const struct xt_entry_target *target)
{
const struct xt_tos_target_info *info = (const void *)target->data;
printf(" --set-tos 0x%02x/0x%02x", info->tos_value, info->tos_mask);
}
static int __tos_xlate(struct xt_xlate *xl, const char *ip,
uint8_t tos, uint8_t tosmask)
{
xt_xlate_add(xl, "%s dscp set ", ip);
if ((tosmask & 0x3f) == 0x3f)
xt_xlate_add(xl, "0x%02x", tos >> 2);
else if (!tos)
xt_xlate_add(xl, "%s dscp and 0x%02x",
ip, (uint8_t)~tosmask >> 2);
else if (tos == tosmask)
xt_xlate_add(xl, "%s dscp or 0x%02x", ip, tos >> 2);
else if (!tosmask)
xt_xlate_add(xl, "%s dscp xor 0x%02x", ip, tos >> 2);
else
xt_xlate_add(xl, "%s dscp and 0x%02x xor 0x%02x",
ip, (uint8_t)~tosmask >> 2, tos >> 2);
return 1;
}
static int tos_xlate(struct xt_xlate *xl,
const struct xt_xlate_tg_params *params)
{
const struct ipt_tos_target_info *info =
(struct ipt_tos_target_info *) params->target->data;
return __tos_xlate(xl, "ip", info->tos, UINT8_MAX);
}
static int tos_xlate6(struct xt_xlate *xl,
const struct xt_xlate_tg_params *params)
{
const struct xt_tos_target_info *info =
(struct xt_tos_target_info *)params->target->data;
return __tos_xlate(xl, "ip6", info->tos_value, info->tos_mask);
}
static struct xtables_target tos_tg_reg[] = {
{
.version = XTABLES_VERSION,
.name = "TOS",
.revision = 0,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_tos_target_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tos_target_info)),
.help = tos_tg_help_v0,
.print = tos_tg_print_v0,
.save = tos_tg_save_v0,
.x6_parse = tos_tg_parse_v0,
.x6_fcheck = tos_tg_check,
.x6_options = tos_tg_opts_v0,
.xlate = tos_xlate,
},
{
.version = XTABLES_VERSION,
.name = "TOS",
.revision = 1,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_tos_target_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tos_target_info)),
.help = tos_tg_help,
.print = tos_tg_print,
.save = tos_tg_save,
.x6_parse = tos_tg_parse,
.x6_fcheck = tos_tg_check,
.x6_options = tos_tg_opts,
.xlate = tos_xlate6,
},
};
void _init(void)
{
xtables_register_targets(tos_tg_reg, ARRAY_SIZE(tos_tg_reg));
}
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