#include <nftables.h>

#include <expression.h>

#include <utils.h>

#include <string.h>

#include <osf.h>

#include <json.h>

static const char *osf_ttl_int_to_str(const uint8_t ttl)

{

	if (ttl == 1)

		return "ttl loose ";

	else if (ttl == 2)

		return "ttl skip ";

	return "";

}

static void osf_expr_print(const struct expr *expr, struct output_ctx *octx)

{

	const char *ttl_str = osf_ttl_int_to_str(expr->osf.ttl);

	if (expr->osf.flags & NFT_OSF_F_VERSION)

		nft_print(octx, "osf %sversion", ttl_str);

	else

		nft_print(octx, "osf %sname", ttl_str);

}

static void osf_expr_clone(struct expr *new, const struct expr *expr)

{

	new->osf.ttl = expr->osf.ttl;

	new->osf.flags = expr->osf.flags;

}

static bool osf_expr_cmp(const struct expr *e1, const struct expr *e2)

{

	return (e1->osf.ttl == e2->osf.ttl) &&

	       (e1->osf.flags == e2->osf.flags);

}

const struct expr_ops osf_expr_ops = {

	.type		= EXPR_OSF,

	.name		= "osf",

	.print		= osf_expr_print,

	.clone		= osf_expr_clone,

	.cmp		= osf_expr_cmp,

	.json		= osf_expr_json,

};

struct expr *osf_expr_alloc(const struct location *loc, const uint8_t ttl,

			    const uint32_t flags)

{

	unsigned int len = NFT_OSF_MAXGENRELEN * BITS_PER_BYTE;

	const struct datatype *type = &string_type;

	struct expr *expr;

	expr = expr_alloc(loc, EXPR_OSF, type,

			  BYTEORDER_HOST_ENDIAN, len);

	expr->osf.ttl = ttl;

	expr->osf.flags = flags;

	return expr;

}