#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);

}