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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 (or any
* later) 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 void hash_expr_destroy(struct expr *expr)
{
expr_free(expr->hash.expr);
}
#define NFTNL_UDATA_HASH_TYPE 0
#define NFTNL_UDATA_HASH_OFFSET 1
#define NFTNL_UDATA_HASH_MOD 2
#define NFTNL_UDATA_HASH_SEED 3
#define NFTNL_UDATA_HASH_SEED_SET 4
#define NFTNL_UDATA_HASH_MAX 5
static int hash_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_HASH_TYPE, expr->hash.type);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_HASH_OFFSET, expr->hash.offset);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_HASH_MOD, expr->hash.mod);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_HASH_SEED, expr->hash.seed);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_HASH_SEED_SET, expr->hash.seed_set);
return 0;
}
static int hash_parse_udata(const struct nftnl_udata *attr, void *data)
{
const struct nftnl_udata **ud = data;
uint8_t type = nftnl_udata_type(attr);
uint8_t len = nftnl_udata_len(attr);
switch (type) {
case NFTNL_UDATA_HASH_TYPE:
case NFTNL_UDATA_HASH_OFFSET:
case NFTNL_UDATA_HASH_SEED:
case NFTNL_UDATA_HASH_SEED_SET:
case NFTNL_UDATA_HASH_MOD:
if (len != sizeof(uint32_t))
return -1;
break;
default:
return 0;
}
ud[type] = attr;
return 0;
}
static struct expr *hash_expr_parse_udata(const struct nftnl_udata *attr)
{
const struct nftnl_udata *ud[NFTNL_UDATA_HASH_MAX + 1] = {};
uint32_t type, seed, seed_set, mod, offset;
int err;
err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
hash_parse_udata, ud);
if (err < 0)
return NULL;
if (!ud[NFTNL_UDATA_HASH_TYPE] ||
!ud[NFTNL_UDATA_HASH_OFFSET] ||
!ud[NFTNL_UDATA_HASH_SEED] ||
!ud[NFTNL_UDATA_HASH_MOD] ||
!ud[NFTNL_UDATA_HASH_SEED_SET])
return NULL;
type = nftnl_udata_get_u32(ud[NFTNL_UDATA_HASH_TYPE]);
offset = nftnl_udata_get_u32(ud[NFTNL_UDATA_HASH_OFFSET]);
seed = nftnl_udata_get_u32(ud[NFTNL_UDATA_HASH_SEED]);
seed_set = nftnl_udata_get_u32(ud[NFTNL_UDATA_HASH_SEED_SET]);
mod = nftnl_udata_get_u32(ud[NFTNL_UDATA_HASH_MOD]);
return hash_expr_alloc(&internal_location, mod, seed_set, seed,
offset, type);
}
const struct expr_ops hash_expr_ops = {
.type = EXPR_HASH,
.name = "hash",
.print = hash_expr_print,
.json = hash_expr_json,
.cmp = hash_expr_cmp,
.clone = hash_expr_clone,
.destroy = hash_expr_destroy,
.parse_udata = hash_expr_parse_udata,
.build_udata = hash_expr_build_udata,
};
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, EXPR_HASH, &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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