You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
133 lines
2.8 KiB
133 lines
2.8 KiB
4 months ago
|
#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 void
|
||
|
|
print_spis(const char *name, uint32_t min, uint32_t max,
|
||
|
|
int invert)
|
||
|
|
{
|
||
|
|
const char *inv = invert ? "!" : "";
|
||
|
|
|
||
|
|
if (min != 0 || max != 0xFFFFFFFF || 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;
|
||
|
|
|
||
|
|
if (!(ahinfo->spis[0] == 0
|
||
|
|
&& ahinfo->spis[1] == 0xFFFFFFFF)) {
|
||
|
|
printf("%s --ahspi ",
|
||
|
|
(ahinfo->invflags & IPT_AH_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;
|
||
|
|
|
||
|
|
if (!(ahinfo->spis[0] == 0 && ahinfo->spis[1] == 0xFFFFFFFF)) {
|
||
|
|
xt_xlate_add(xl, "ah spi%s ",
|
||
|
|
(ahinfo->invflags & IPT_AH_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]);
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|