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/*
* Hash expression definitions.
*
* Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <nftables.h>
#include <expression.h>
#include <datatype.h>
#include <gmputil.h>
#include <hash.h>
#include <utils.h>
static void hash_expr_print(const struct expr *expr)
{
printf("jhash ");
expr_print(expr->hash.expr);
printf(" mod %u", expr->hash.mod);
if (expr->hash.seed)
printf(" seed 0x%x", expr->hash.seed);
if (expr->hash.offset)
printf(" offset %u", expr->hash.offset);
}
static bool hash_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return expr_cmp(e1->hash.expr, e2->hash.expr) &&
e1->hash.mod == e2->hash.mod &&
e1->hash.seed == e2->hash.seed &&
e1->hash.offset == e2->hash.offset;
}
static void hash_expr_clone(struct expr *new, const struct expr *expr)
{
new->hash.expr = expr_clone(expr->hash.expr);
new->hash.mod = expr->hash.mod;
new->hash.seed = expr->hash.seed;
new->hash.offset = expr->hash.offset;
}
static const struct expr_ops hash_expr_ops = {
.type = EXPR_HASH,
.name = "hash",
.print = hash_expr_print,
.cmp = hash_expr_cmp,
.clone = hash_expr_clone,
};
struct expr *hash_expr_alloc(const struct location *loc, uint32_t mod,
uint32_t seed, uint32_t offset)
{
struct expr *expr;
expr = expr_alloc(loc, &hash_expr_ops, &integer_type,
BYTEORDER_HOST_ENDIAN, 4 * BITS_PER_BYTE);
expr->hash.mod = mod;
expr->hash.seed = seed;
expr->hash.offset = offset;
return expr;
}
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