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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@computergmbh.de>
*/
#include <getopt.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 {
u_int8_t tos;
};
enum {
FLAG_TOS = 1 << 0,
};
static const struct option tos_tg_opts_v0[] = {
{.name = "set-tos", .has_arg = true, .val = '='},
{ .name = NULL }
};
static const struct option tos_tg_opts[] = {
{.name = "set-tos", .has_arg = true, .val = '='},
{.name = "and-tos", .has_arg = true, .val = '&'},
{.name = "or-tos", .has_arg = true, .val = '|'},
{.name = "xor-tos", .has_arg = true, .val = '^'},
{ .name = NULL }
};
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 int tos_tg_parse_v0(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct ipt_tos_target_info *info = (void *)(*target)->data;
struct tos_value_mask tvm;
switch (c) {
case '=':
xtables_param_act(XTF_ONLY_ONCE, "TOS", "--set-tos", *flags & FLAG_TOS);
xtables_param_act(XTF_NO_INVERT, "TOS", "--set-tos", invert);
if (!tos_parse_symbolic(optarg, &tvm, 0xFF))
xtables_param_act(XTF_BAD_VALUE, "TOS", "--set-tos", optarg);
if (tvm.mask != 0xFF)
xtables_error(PARAMETER_PROBLEM, "tos match: Your kernel "
"is too old to support anything besides "
"/0xFF as a mask.");
info->tos = tvm.value;
*flags |= FLAG_TOS;
return true;
}
return false;
}
static int tos_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
struct xt_tos_target_info *info = (void *)(*target)->data;
struct tos_value_mask tvm;
unsigned int bits;
switch (c) {
case '=': /* --set-tos */
xtables_param_act(XTF_ONLY_ONCE, "TOS", "--set-tos", *flags & FLAG_TOS);
xtables_param_act(XTF_NO_INVERT, "TOS", "--set-tos", invert);
if (!tos_parse_symbolic(optarg, &tvm, 0x3F))
xtables_param_act(XTF_BAD_VALUE, "TOS", "--set-tos", optarg);
info->tos_value = tvm.value;
info->tos_mask = tvm.mask;
break;
case '&': /* --and-tos */
xtables_param_act(XTF_ONLY_ONCE, "TOS", "--and-tos", *flags & FLAG_TOS);
xtables_param_act(XTF_NO_INVERT, "TOS", "--and-tos", invert);
if (!xtables_strtoui(optarg, NULL, &bits, 0, UINT8_MAX))
xtables_param_act(XTF_BAD_VALUE, "TOS", "--and-tos", optarg);
info->tos_value = 0;
info->tos_mask = ~bits;
break;
case '|': /* --or-tos */
xtables_param_act(XTF_ONLY_ONCE, "TOS", "--or-tos", *flags & FLAG_TOS);
xtables_param_act(XTF_NO_INVERT, "TOS", "--or-tos", invert);
if (!xtables_strtoui(optarg, NULL, &bits, 0, UINT8_MAX))
xtables_param_act(XTF_BAD_VALUE, "TOS", "--or-tos", optarg);
info->tos_value = bits;
info->tos_mask = bits;
break;
case '^': /* --xor-tos */
xtables_param_act(XTF_ONLY_ONCE, "TOS", "--xor-tos", *flags & FLAG_TOS);
xtables_param_act(XTF_NO_INVERT, "TOS", "--xor-tos", invert);
if (!xtables_strtoui(optarg, NULL, &bits, 0, UINT8_MAX))
xtables_param_act(XTF_BAD_VALUE, "TOS", "--xor-tos", optarg);
info->tos_value = bits;
info->tos_mask = 0;
break;
default:
return false;
}
*flags |= FLAG_TOS;
return true;
}
static void tos_tg_check(unsigned int flags)
{
if (flags == 0)
xtables_error(PARAMETER_PROBLEM,
"TOS: The --set-tos parameter 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)(u_int8_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 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,
.parse = tos_tg_parse_v0,
.final_check = tos_tg_check,
.print = tos_tg_print_v0,
.save = tos_tg_save_v0,
.extra_opts = tos_tg_opts_v0,
},
{
.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,
.parse = tos_tg_parse,
.final_check = tos_tg_check,
.print = tos_tg_print,
.save = tos_tg_save,
.extra_opts = tos_tg_opts,
},
};
void _init(void)
{
xtables_register_targets(tos_tg_reg, ARRAY_SIZE(tos_tg_reg));
}
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