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/*
* Copyright (c) 2018 Fernando Fernandez Mancera <ffmancera@riseup.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 (or any
* later) as published by the Free Software Foundation.
*/
#include <nft.h>
#include <nftables.h>
#include <expression.h>
#include <utils.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);
}
static int osf_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
return 0;
}
static struct expr *osf_expr_parse_udata(const struct nftnl_udata *attr)
{
return osf_expr_alloc(&internal_location, 0, 0);
}
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,
.parse_udata = osf_expr_parse_udata,
.build_udata = osf_expr_build_udata,
};
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;
}
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