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#include <stdio.h>
#include <xtables.h>
#include <linux/netfilter_ipv4/ipt_ah.h>
enum {
O_AHSPI = 0,
};
static void ah_help(void)
{
printf(
"ah match options:\n"
"[!] --ahspi spi[:spi]\n"
" match spi (range)\n");
}
static const struct xt_option_entry ah_opts[] = {
{.name = "ahspi", .id = O_AHSPI, .type = XTTYPE_UINT32RC,
.flags = XTOPT_INVERT | XTOPT_PUT,
XTOPT_POINTER(struct ipt_ah, spis)},
XTOPT_TABLEEND,
};
static void ah_init(struct xt_entry_match *m)
{
struct ipt_ah *ahinfo = (void *)m->data;
ahinfo->spis[1] = ~0U;
}
static void ah_parse(struct xt_option_call *cb)
{
struct ipt_ah *ahinfo = cb->data;
xtables_option_parse(cb);
if (cb->nvals == 1)
ahinfo->spis[1] = ahinfo->spis[0];
if (cb->invert)
ahinfo->invflags |= IPT_AH_INV_SPI;
}
static bool skip_spi_match(uint32_t min, uint32_t max, bool inv)
{
return min == 0 && max == UINT32_MAX && !inv;
}
static void
print_spis(const char *name, uint32_t min, uint32_t max,
int invert)
{
const char *inv = invert ? "!" : "";
if (!skip_spi_match(min, max, invert)) {
printf("%s", name);
if (min == max) {
printf(":%s", inv);
printf("%u", min);
} else {
printf("s:%s", inv);
printf("%u",min);
printf(":");
printf("%u",max);
}
}
}
static void ah_print(const void *ip, const struct xt_entry_match *match,
int numeric)
{
const struct ipt_ah *ah = (struct ipt_ah *)match->data;
printf(" ah ");
print_spis("spi", ah->spis[0], ah->spis[1],
ah->invflags & IPT_AH_INV_SPI);
if (ah->invflags & ~IPT_AH_INV_MASK)
printf(" Unknown invflags: 0x%X",
ah->invflags & ~IPT_AH_INV_MASK);
}
static void ah_save(const void *ip, const struct xt_entry_match *match)
{
const struct ipt_ah *ahinfo = (struct ipt_ah *)match->data;
bool inv_spi = ahinfo->invflags & IPT_AH_INV_SPI;
if (!skip_spi_match(ahinfo->spis[0], ahinfo->spis[1], inv_spi)) {
printf("%s --ahspi ", inv_spi ? " !" : "");
if (ahinfo->spis[0]
!= ahinfo->spis[1])
printf("%u:%u",
ahinfo->spis[0],
ahinfo->spis[1]);
else
printf("%u",
ahinfo->spis[0]);
}
}
static int ah_xlate(struct xt_xlate *xl,
const struct xt_xlate_mt_params *params)
{
const struct ipt_ah *ahinfo = (struct ipt_ah *)params->match->data;
bool inv_spi = ahinfo->invflags & IPT_AH_INV_SPI;
if (!skip_spi_match(ahinfo->spis[0], ahinfo->spis[1], inv_spi)) {
xt_xlate_add(xl, "ah spi%s ", inv_spi ? " !=" : "");
if (ahinfo->spis[0] != ahinfo->spis[1])
xt_xlate_add(xl, "%u-%u", ahinfo->spis[0],
ahinfo->spis[1]);
else
xt_xlate_add(xl, "%u", ahinfo->spis[0]);
} else {
xt_xlate_add(xl, "meta l4proto ah");
}
return 1;
}
static struct xtables_match ah_mt_reg = {
.name = "ah",
.version = XTABLES_VERSION,
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct ipt_ah)),
.userspacesize = XT_ALIGN(sizeof(struct ipt_ah)),
.help = ah_help,
.init = ah_init,
.print = ah_print,
.save = ah_save,
.x6_parse = ah_parse,
.x6_options = ah_opts,
.xlate = ah_xlate,
};
void
_init(void)
{
xtables_register_match(&ah_mt_reg);
}
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