udata.c
/*
* (C) 2012-2016 by Pablo Neira Ayuso <pablo@netfilter.org>
* (C) 2016 by Carlos Falgueras García <carlosfg@riseup.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <libnftnl/udata.h>
#include <udata.h>
#include <utils.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
EXPORT_SYMBOL(nftnl_udata_buf_alloc);
struct nftnl_udata_buf *nftnl_udata_buf_alloc(uint32_t data_size)
{
struct nftnl_udata_buf *buf;
buf = malloc(sizeof(struct nftnl_udata_buf) + data_size);
if (!buf)
return NULL;
buf->size = data_size;
buf->end = buf->data;
return buf;
}
EXPORT_SYMBOL(nftnl_udata_buf_free);
void nftnl_udata_buf_free(const struct nftnl_udata_buf *buf)
{
xfree(buf);
}
EXPORT_SYMBOL(nftnl_udata_buf_len);
uint32_t nftnl_udata_buf_len(const struct nftnl_udata_buf *buf)
{
return (uint32_t)(buf->end - buf->data);
}
EXPORT_SYMBOL(nftnl_udata_buf_data);
void *nftnl_udata_buf_data(const struct nftnl_udata_buf *buf)
{
return (void *)buf->data;
}
EXPORT_SYMBOL(nftnl_udata_buf_put);
void nftnl_udata_buf_put(struct nftnl_udata_buf *buf, const void *data,
uint32_t len)
{
memcpy(buf->data, data, len <= buf->size ? len : buf->size);
buf->end = buf->data + len;
}
EXPORT_SYMBOL(nftnl_udata_start);
struct nftnl_udata *nftnl_udata_start(const struct nftnl_udata_buf *buf)
{
return (struct nftnl_udata *)buf->data;
}
EXPORT_SYMBOL(nftnl_udata_end);
struct nftnl_udata *nftnl_udata_end(const struct nftnl_udata_buf *buf)
{
return (struct nftnl_udata *)buf->end;
}
EXPORT_SYMBOL(nftnl_udata_put);
bool nftnl_udata_put(struct nftnl_udata_buf *buf, uint8_t type, uint32_t len,
const void *value)
{
struct nftnl_udata *attr;
if (len > UINT8_MAX || buf->size < len + sizeof(struct nftnl_udata))
return false;
attr = (struct nftnl_udata *)buf->end;
attr->len = len;
attr->type = type;
memcpy(attr->value, value, len);
buf->end = (char *)nftnl_udata_next(attr);
return true;
}
EXPORT_SYMBOL(nftnl_udata_put_strz);
bool nftnl_udata_put_strz(struct nftnl_udata_buf *buf, uint8_t type,
const char *strz)
{
return nftnl_udata_put(buf, type, strlen(strz) + 1, strz);
}
EXPORT_SYMBOL(nftnl_udata_put_u32);
bool nftnl_udata_put_u32(struct nftnl_udata_buf *buf, uint8_t type,
uint32_t data)
{
return nftnl_udata_put(buf, type, sizeof(data), &data);
}
EXPORT_SYMBOL(nftnl_udata_type);
uint8_t nftnl_udata_type(const struct nftnl_udata *attr)
{
return attr->type;
}
EXPORT_SYMBOL(nftnl_udata_len);
uint8_t nftnl_udata_len(const struct nftnl_udata *attr)
{
return attr->len;
}
EXPORT_SYMBOL(nftnl_udata_get);
void *nftnl_udata_get(const struct nftnl_udata *attr)
{
return (void *)attr->value;
}
EXPORT_SYMBOL(nftnl_udata_get_u32);
uint32_t nftnl_udata_get_u32(const struct nftnl_udata *attr)
{
uint32_t data;
memcpy(&data, attr->value, sizeof(data));
return data;
}
EXPORT_SYMBOL(nftnl_udata_next);
struct nftnl_udata *nftnl_udata_next(const struct nftnl_udata *attr)
{
return (struct nftnl_udata *)&attr->value[attr->len];
}
EXPORT_SYMBOL(nftnl_udata_parse);
int nftnl_udata_parse(const void *data, uint32_t data_len, nftnl_udata_cb_t cb,
void *cb_data)
{
int ret = 0;
const struct nftnl_udata *attr;
nftnl_udata_for_each_data(data, data_len, attr) {
ret = cb(attr, cb_data);
if (ret < 0)
return ret;
}
return ret;
}
EXPORT_SYMBOL(nftnl_udata_nest_start);
struct nftnl_udata *nftnl_udata_nest_start(struct nftnl_udata_buf *buf,
uint8_t type)
{
struct nftnl_udata *ud = nftnl_udata_end(buf);
nftnl_udata_put(buf, type, 0, NULL);
return ud;
}
EXPORT_SYMBOL(nftnl_udata_nest_end);
void nftnl_udata_nest_end(struct nftnl_udata_buf *buf, struct nftnl_udata *ud)
{
ud->len = buf->end - (char *)ud->value;
}