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/* Shared library add-on to ip6tables to add ESP support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <errno.h>
#include <ip6tables.h>
#include <linux/netfilter_ipv6/ip6t_esp.h>
/* Function which prints out usage message. */
static void
help(void)
{
printf(
"ESP v%s options:\n"
" --espspi [!] spi[:spi] match spi (range)\n",
IPTABLES_VERSION);
}
static struct option opts[] = {
{ .name = "espspi", .has_arg = 1, .flag = 0, .val = '1' },
{ .name = 0 }
};
static u_int32_t
parse_esp_spi(const char *spistr)
{
unsigned long int spi;
char* ep;
spi = strtoul(spistr, &ep, 0);
if ( spistr == ep ) {
exit_error(PARAMETER_PROBLEM,
"ESP no valid digits in spi `%s'", spistr);
}
if ( spi == ULONG_MAX && errno == ERANGE ) {
exit_error(PARAMETER_PROBLEM,
"spi `%s' specified too big: would overflow", spistr);
}
if ( *spistr != '\0' && *ep != '\0' ) {
exit_error(PARAMETER_PROBLEM,
"ESP error parsing spi `%s'", spistr);
}
return (u_int32_t) spi;
}
static void
parse_esp_spis(const char *spistring, u_int32_t *spis)
{
char *buffer;
char *cp;
buffer = strdup(spistring);
if ((cp = strchr(buffer, ':')) == NULL)
spis[0] = spis[1] = parse_esp_spi(buffer);
else {
*cp = '\0';
cp++;
spis[0] = buffer[0] ? parse_esp_spi(buffer) : 0;
spis[1] = cp[0] ? parse_esp_spi(cp) : 0xFFFFFFFF;
if (spis[0] > spis[1])
exit_error(PARAMETER_PROBLEM,
"Invalid ESP spi range: %s", spistring);
}
free(buffer);
}
/* Initialize the match. */
static void
init(struct ip6t_entry_match *m, unsigned int *nfcache)
{
struct ip6t_esp *espinfo = (struct ip6t_esp *)m->data;
espinfo->spis[1] = 0xFFFFFFFF;
}
#define ESP_SPI 0x01
/* Function which parses command options; returns true if it
ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ip6t_entry *entry,
unsigned int *nfcache,
struct ip6t_entry_match **match)
{
struct ip6t_esp *espinfo = (struct ip6t_esp *)(*match)->data;
switch (c) {
case '1':
if (*flags & ESP_SPI)
exit_error(PARAMETER_PROBLEM,
"Only one `--espspi' allowed");
check_inverse(optarg, &invert, &optind, 0);
parse_esp_spis(argv[optind-1], espinfo->spis);
if (invert)
espinfo->invflags |= IP6T_ESP_INV_SPI;
*flags |= ESP_SPI;
break;
default:
return 0;
}
return 1;
}
/* Final check; we don't care. */
static void
final_check(unsigned int flags)
{
}
static void
print_spis(const char *name, u_int32_t min, u_int32_t max,
int invert)
{
const char *inv = invert ? "!" : "";
if (min != 0 || max != 0xFFFFFFFF || invert) {
if (min == max)
printf("%s:%s%u ", name, inv, min);
else
printf("%ss:%s%u:%u ", name, inv, min, max);
}
}
/* Prints out the union ip6t_matchinfo. */
static void
print(const struct ip6t_ip6 *ip,
const struct ip6t_entry_match *match, int numeric)
{
const struct ip6t_esp *esp = (struct ip6t_esp *)match->data;
printf("esp ");
print_spis("spi", esp->spis[0], esp->spis[1],
esp->invflags & IP6T_ESP_INV_SPI);
if (esp->invflags & ~IP6T_ESP_INV_MASK)
printf("Unknown invflags: 0x%X ",
esp->invflags & ~IP6T_ESP_INV_MASK);
}
/* Saves the union ip6t_matchinfo in parsable form to stdout. */
static void save(const struct ip6t_ip6 *ip, const struct ip6t_entry_match *match)
{
const struct ip6t_esp *espinfo = (struct ip6t_esp *)match->data;
if (!(espinfo->spis[0] == 0
&& espinfo->spis[1] == 0xFFFFFFFF)) {
printf("--espspi %s",
(espinfo->invflags & IP6T_ESP_INV_SPI) ? "! " : "");
if (espinfo->spis[0]
!= espinfo->spis[1])
printf("%u:%u ",
espinfo->spis[0],
espinfo->spis[1]);
else
printf("%u ",
espinfo->spis[0]);
}
}
static
struct ip6tables_match esp = {
.name = "esp",
.version = IPTABLES_VERSION,
.size = IP6T_ALIGN(sizeof(struct ip6t_esp)),
.userspacesize = IP6T_ALIGN(sizeof(struct ip6t_esp)),
.help = &help,
.init = &init,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void
_init(void)
{
register_match6(&esp);
}
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