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/* Shared library add-on to iptables to add TOS matching support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_tos.h>
/* TOS names and values. */
static const
struct TOS_value
{
unsigned char TOS;
const char *name;
} TOS_values[] = {
{ IPTOS_LOWDELAY, "Minimize-Delay" },
{ IPTOS_THROUGHPUT, "Maximize-Throughput" },
{ IPTOS_RELIABILITY, "Maximize-Reliability" },
{ IPTOS_MINCOST, "Minimize-Cost" },
{ IPTOS_NORMALSVC, "Normal-Service" },
};
/* Function which prints out usage message. */
static void tos_help(void)
{
unsigned int i;
printf(
"TOS match v%s options:\n"
"[!] --tos value Match Type of Service field from one of the\n"
" following numeric or descriptive values:\n",
IPTABLES_VERSION);
for (i = 0; i < sizeof(TOS_values)/sizeof(struct TOS_value);i++)
printf(" %s %u (0x%02x)\n",
TOS_values[i].name,
TOS_values[i].TOS,
TOS_values[i].TOS);
fputc('\n', stdout);
}
static const struct option tos_opts[] = {
{ "tos", 1, NULL, '1' },
{ }
};
static void
parse_tos(const char *s, struct ipt_tos_info *info)
{
unsigned int i;
unsigned int tos;
if (string_to_number(s, 0, 255, &tos) != -1) {
if (tos == IPTOS_LOWDELAY
|| tos == IPTOS_THROUGHPUT
|| tos == IPTOS_RELIABILITY
|| tos == IPTOS_MINCOST
|| tos == IPTOS_NORMALSVC) {
info->tos = (u_int8_t )tos;
return;
}
} else {
for (i = 0; i<sizeof(TOS_values)/sizeof(struct TOS_value); i++)
if (strcasecmp(s,TOS_values[i].name) == 0) {
info->tos = TOS_values[i].TOS;
return;
}
}
exit_error(PARAMETER_PROBLEM, "Bad TOS value `%s'", s);
}
/* Function which parses command options; returns true if it
ate an option */
static int tos_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct ipt_tos_info *tosinfo = (struct ipt_tos_info *)(*match)->data;
switch (c) {
case '1':
/* Ensure that `--tos' haven't been used yet. */
if (*flags == 1)
exit_error(PARAMETER_PROBLEM,
"tos match: only use --tos once!");
check_inverse(optarg, &invert, &optind, 0);
parse_tos(argv[optind-1], tosinfo);
if (invert)
tosinfo->invert = 1;
*flags = 1;
break;
default:
return 0;
}
return 1;
}
static void
print_tos(u_int8_t tos, int numeric)
{
unsigned int i;
if (!numeric) {
for (i = 0; i<sizeof(TOS_values)/sizeof(struct TOS_value); i++)
if (TOS_values[i].TOS == tos) {
printf("%s ", TOS_values[i].name);
return;
}
}
printf("0x%02x ", tos);
}
/* Final check; must have specified --tos. */
static void tos_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"TOS match: You must specify `--tos'");
}
/* Prints out the matchinfo. */
static void tos_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct ipt_tos_info *info = (const struct ipt_tos_info *)match->data;
printf("TOS match ");
if (info->invert)
printf("!");
print_tos(info->tos, numeric);
}
/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void tos_save(const void *ip, const struct xt_entry_match *match)
{
const struct ipt_tos_info *info = (const struct ipt_tos_info *)match->data;
if (info->invert)
printf("! ");
printf("--tos ");
print_tos(info->tos, 0);
}
static struct iptables_match tos_match = {
.name = "tos",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_tos_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_tos_info)),
.help = tos_help,
.parse = tos_parse,
.final_check = tos_check,
.print = tos_print,
.save = tos_save,
.extra_opts = tos_opts,
};
void _init(void)
{
register_match(&tos_match);
}
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