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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, struct output_ctx *octx)
{
switch (expr->hash.type) {
case NFT_HASH_SYM:
nft_print(octx, "symhash");
break;
case NFT_HASH_JENKINS:
default:
nft_print(octx, "jhash ");
expr_print(expr->hash.expr, octx);
}
nft_print(octx, " mod %u", expr->hash.mod);
if (expr->hash.seed_set)
nft_print(octx, " seed 0x%x", expr->hash.seed);
if (expr->hash.offset)
nft_print(octx, " offset %u", expr->hash.offset);
}
static bool hash_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return (e1->hash.expr ||
expr_cmp(e1->hash.expr, e2->hash.expr)) &&
e1->hash.mod == e2->hash.mod &&
e1->hash.seed_set == e2->hash.seed_set &&
e1->hash.seed == e2->hash.seed &&
e1->hash.offset == e2->hash.offset &&
e1->hash.type == e2->hash.type;
}
static void hash_expr_clone(struct expr *new, const struct expr *expr)
{
if (expr->hash.expr)
new->hash.expr = expr_clone(expr->hash.expr);
new->hash.mod = expr->hash.mod;
new->hash.seed_set = expr->hash.seed_set;
new->hash.seed = expr->hash.seed;
new->hash.offset = expr->hash.offset;
new->hash.type = expr->hash.type;
}
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,
bool seed_set, uint32_t seed,
uint32_t offset,
enum nft_hash_types type)
{
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_set = seed_set;
expr->hash.seed = seed;
expr->hash.offset = offset;
expr->hash.type = type;
return expr;
}
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