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/*
* (C) 2015 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 as published
* by the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <arpa/inet.h>
#include <errno.h>
#include "internal.h"
#include <libmnl/libmnl.h>
#include <linux/netfilter/nf_tables.h>
#include <libnftnl/expr.h>
#include <libnftnl/rule.h>
#include "expr_ops.h"
#include "data_reg.h"
#include <buffer.h>
struct nftnl_expr_fwd {
enum nft_registers sreg_dev;
};
static int nftnl_expr_fwd_set(struct nftnl_expr *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
switch (type) {
case NFTNL_EXPR_FWD_SREG_DEV:
fwd->sreg_dev= *((uint32_t *)data);
break;
default:
return -1;
}
return 0;
}
static const void *nftnl_expr_fwd_get(const struct nftnl_expr *e,
uint16_t type, uint32_t *data_len)
{
struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
switch (type) {
case NFTNL_EXPR_FWD_SREG_DEV:
*data_len = sizeof(fwd->sreg_dev);
return &fwd->sreg_dev;
}
return NULL;
}
static int nftnl_expr_fwd_cb(const struct nlattr *attr, void *data)
{
const struct nlattr **tb = data;
int type = mnl_attr_get_type(attr);
if (mnl_attr_type_valid(attr, NFTA_FWD_MAX) < 0)
return MNL_CB_OK;
switch (type) {
case NFTA_FWD_SREG_DEV:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void nftnl_expr_fwd_build(struct nlmsghdr *nlh, struct nftnl_expr *e)
{
struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV))
mnl_attr_put_u32(nlh, NFTA_FWD_SREG_DEV, htonl(fwd->sreg_dev));
}
static int nftnl_expr_fwd_parse(struct nftnl_expr *e, struct nlattr *attr)
{
struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
struct nlattr *tb[NFTA_FWD_MAX + 1] = {};
int ret = 0;
if (mnl_attr_parse_nested(attr, nftnl_expr_fwd_cb, tb) < 0)
return -1;
if (tb[NFTA_FWD_SREG_DEV]) {
fwd->sreg_dev = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_DEV]));
e->flags |= (1 << NFTNL_EXPR_FWD_SREG_DEV);
}
return ret;
}
static int nftnl_expr_fwd_json_parse(struct nftnl_expr *e, json_t *root,
struct nftnl_parse_err *err)
{
#ifdef JSON_PARSING
uint32_t sreg_dev;
int ret;
ret = nftnl_jansson_parse_val(root, "sreg_dev", NFTNL_TYPE_U32, &sreg_dev, err);
if (ret >= 0)
nftnl_expr_set_u32(e, NFTNL_EXPR_FWD_SREG_DEV, sreg_dev);
return 0;
#else
errno = EOPNOTSUPP;
return -1;
#endif
}
static int nftnl_expr_fwd_xml_parse(struct nftnl_expr *e, mxml_node_t *tree,
struct nftnl_parse_err *err)
{
#ifdef XML_PARSING
uint32_t sreg_dev;
if (nftnl_mxml_reg_parse(tree, "sreg_dev", &sreg_dev, MXML_DESCEND_FIRST,
NFTNL_XML_OPT, err) == 0)
nftnl_expr_set_u32(e, NFTNL_EXPR_FWD_SREG_DEV, sreg_dev);
return 0;
#else
errno = EOPNOTSUPP;
return -1;
#endif
}
static int nftnl_expr_fwd_export(char *buf, size_t size, struct nftnl_expr *e,
int type)
{
struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
NFTNL_BUF_INIT(b, buf, size);
if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV))
nftnl_buf_u32(&b, type, fwd->sreg_dev, "sreg_dev");
return nftnl_buf_done(&b);
}
static int nftnl_expr_fwd_snprintf_default(char *buf, size_t len,
struct nftnl_expr *e, uint32_t flags)
{
int size = len, offset = 0, ret;
struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) {
ret = snprintf(buf + offset, len, "sreg_dev %u ", fwd->sreg_dev);
SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
}
return offset;
}
static int nftnl_expr_fwd_snprintf(char *buf, size_t len, uint32_t type,
uint32_t flags, struct nftnl_expr *e)
{
switch (type) {
case NFTNL_OUTPUT_DEFAULT:
return nftnl_expr_fwd_snprintf_default(buf, len, e, flags);
case NFTNL_OUTPUT_XML:
case NFTNL_OUTPUT_JSON:
return nftnl_expr_fwd_export(buf, len, e, type);
default:
break;
}
return -1;
}
struct expr_ops expr_ops_fwd = {
.name = "fwd",
.alloc_len = sizeof(struct nftnl_expr_fwd),
.max_attr = NFTA_FWD_MAX,
.set = nftnl_expr_fwd_set,
.get = nftnl_expr_fwd_get,
.parse = nftnl_expr_fwd_parse,
.build = nftnl_expr_fwd_build,
.snprintf = nftnl_expr_fwd_snprintf,
.xml_parse = nftnl_expr_fwd_xml_parse,
.json_parse = nftnl_expr_fwd_json_parse,
};
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