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/*
* Number generator 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 <numgen.h>
#include <utils.h>
static const char *numgen_type[NFT_NG_RANDOM + 1] = {
[NFT_NG_INCREMENTAL] = "inc",
[NFT_NG_RANDOM] = "random",
};
static const char *numgen_type_str(enum nft_ng_types type)
{
if (type > NFT_NG_RANDOM)
return "[unknown numgen]";
return numgen_type[type];
}
static void numgen_expr_print(const struct expr *expr, struct output_ctx *octx)
{
nft_print(octx, "numgen %s mod %u",
numgen_type_str(expr->numgen.type),
expr->numgen.mod);
if (expr->numgen.offset)
nft_print(octx, " offset %u", expr->numgen.offset);
}
static bool numgen_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return e1->numgen.type == e2->numgen.type &&
e1->numgen.mod == e2->numgen.mod &&
e1->numgen.offset == e2->numgen.offset;
}
static void numgen_expr_clone(struct expr *new, const struct expr *expr)
{
new->numgen.type = expr->numgen.type;
new->numgen.mod = expr->numgen.mod;
new->numgen.offset = expr->numgen.offset;
}
#define NFTNL_UDATA_NUMGEN_TYPE 0
#define NFTNL_UDATA_NUMGEN_MOD 1
#define NFTNL_UDATA_NUMGEN_OFFSET 2
#define NFTNL_UDATA_NUMGEN_MAX 3
static int numgen_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_NUMGEN_TYPE, expr->numgen.type);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_NUMGEN_MOD, expr->numgen.mod);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_NUMGEN_OFFSET, expr->numgen.offset);
return 0;
}
static int numgen_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_NUMGEN_TYPE:
case NFTNL_UDATA_NUMGEN_MOD:
case NFTNL_UDATA_NUMGEN_OFFSET:
if (len != sizeof(uint32_t))
return -1;
break;
default:
return 0;
}
ud[type] = attr;
return 0;
}
static struct expr *numgen_expr_parse_udata(const struct nftnl_udata *attr)
{
const struct nftnl_udata *ud[NFTNL_UDATA_NUMGEN_MAX + 1] = {};
enum nft_ng_types type;
uint32_t mod, offset;
int err;
err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
numgen_parse_udata, ud);
if (err < 0)
return NULL;
if (!ud[NFTNL_UDATA_NUMGEN_TYPE] ||
!ud[NFTNL_UDATA_NUMGEN_MOD] ||
!ud[NFTNL_UDATA_NUMGEN_OFFSET])
return NULL;
type = nftnl_udata_get_u32(ud[NFTNL_UDATA_NUMGEN_TYPE]);
mod = nftnl_udata_get_u32(ud[NFTNL_UDATA_NUMGEN_MOD]);
offset = nftnl_udata_get_u32(ud[NFTNL_UDATA_NUMGEN_OFFSET]);
return numgen_expr_alloc(&internal_location, type, mod, offset);
}
const struct expr_ops numgen_expr_ops = {
.type = EXPR_NUMGEN,
.name = "numgen",
.print = numgen_expr_print,
.json = numgen_expr_json,
.cmp = numgen_expr_cmp,
.clone = numgen_expr_clone,
.parse_udata = numgen_expr_parse_udata,
.build_udata = numgen_expr_build_udata,
};
struct expr *numgen_expr_alloc(const struct location *loc,
enum nft_ng_types type, uint32_t mod,
uint32_t offset)
{
struct expr *expr;
expr = expr_alloc(loc, EXPR_NUMGEN, &integer_type,
BYTEORDER_HOST_ENDIAN, 4 * BITS_PER_BYTE);
expr->numgen.type = type;
expr->numgen.mod = mod;
expr->numgen.offset = offset;
return expr;
}
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