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/*
* (C) 2012 by 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.
*
* This code has been sponsored by Sophos Astaro <http://www.sophos.com>
*/
#include "internal.h"
#include "expr_ops.h"
#include <time.h>
#include <endian.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <libmnl/libmnl.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <libnftables/expr.h>
#include "linux_list.h"
struct nft_rule_expr *nft_rule_expr_alloc(const char *name)
{
struct nft_rule_expr *expr;
struct expr_ops *ops;
ops = nft_expr_ops_lookup(name);
if (ops == NULL)
return NULL;
expr = calloc(1, sizeof(struct nft_rule_expr) + ops->alloc_len);
if (expr == NULL)
return NULL;
/* Manually set expression name attribute */
expr->flags |= (1 << NFT_RULE_EXPR_ATTR_NAME);
expr->ops = ops;
return expr;
}
EXPORT_SYMBOL(nft_rule_expr_alloc);
void nft_rule_expr_free(struct nft_rule_expr *expr)
{
if (expr->ops->free)
expr->ops->free(expr);
xfree(expr);
}
EXPORT_SYMBOL(nft_rule_expr_free);
bool nft_rule_expr_is_set(const struct nft_rule_expr *expr, uint16_t type)
{
return expr->flags & (1 << type);
}
EXPORT_SYMBOL(nft_rule_expr_is_set);
void
nft_rule_expr_set(struct nft_rule_expr *expr, uint16_t type,
const void *data, uint32_t data_len)
{
switch(type) {
case NFT_RULE_EXPR_ATTR_NAME: /* cannot be modified */
return;
default:
if (expr->ops->set(expr, type, data, data_len) < 0)
return;
}
expr->flags |= (1 << type);
}
EXPORT_SYMBOL(nft_rule_expr_set);
void
nft_rule_expr_set_u8(struct nft_rule_expr *expr, uint16_t type, uint8_t data)
{
nft_rule_expr_set(expr, type, &data, sizeof(uint8_t));
}
EXPORT_SYMBOL(nft_rule_expr_set_u8);
void
nft_rule_expr_set_u16(struct nft_rule_expr *expr, uint16_t type, uint16_t data)
{
nft_rule_expr_set(expr, type, &data, sizeof(uint16_t));
}
EXPORT_SYMBOL(nft_rule_expr_set_u16);
void
nft_rule_expr_set_u32(struct nft_rule_expr *expr, uint16_t type, uint32_t data)
{
nft_rule_expr_set(expr, type, &data, sizeof(uint32_t));
}
EXPORT_SYMBOL(nft_rule_expr_set_u32);
void
nft_rule_expr_set_u64(struct nft_rule_expr *expr, uint16_t type, uint64_t data)
{
nft_rule_expr_set(expr, type, &data, sizeof(uint64_t));
}
EXPORT_SYMBOL(nft_rule_expr_set_u64);
void
nft_rule_expr_set_str(struct nft_rule_expr *expr, uint16_t type, const char *str)
{
nft_rule_expr_set(expr, type, str, strlen(str)+1);
}
EXPORT_SYMBOL(nft_rule_expr_set_str);
const void *nft_rule_expr_get(const struct nft_rule_expr *expr,
uint16_t type, uint32_t *data_len)
{
const void *ret;
if (!(expr->flags & (1 << type)))
return NULL;
switch(type) {
case NFT_RULE_EXPR_ATTR_NAME:
ret = expr->ops->name;
break;
default:
ret = expr->ops->get(expr, type, data_len);
break;
}
return ret;
}
EXPORT_SYMBOL(nft_rule_expr_get);
uint8_t nft_rule_expr_get_u8(const struct nft_rule_expr *expr, uint16_t type)
{
const void *data;
uint32_t data_len;
data = nft_rule_expr_get(expr, type, &data_len);
if (data == NULL)
return 0;
if (data_len != sizeof(uint8_t))
return 0;
return *((uint8_t *)data);
}
EXPORT_SYMBOL(nft_rule_expr_get_u8);
uint16_t nft_rule_expr_get_u16(const struct nft_rule_expr *expr, uint16_t type)
{
const void *data;
uint32_t data_len;
data = nft_rule_expr_get(expr, type, &data_len);
if (data == NULL)
return 0;
if (data_len != sizeof(uint16_t))
return 0;
return *((uint16_t *)data);
}
EXPORT_SYMBOL(nft_rule_expr_get_u16);
uint32_t nft_rule_expr_get_u32(const struct nft_rule_expr *expr, uint16_t type)
{
const void *data;
uint32_t data_len;
data = nft_rule_expr_get(expr, type, &data_len);
if (data == NULL)
return 0;
if (data_len != sizeof(uint32_t))
return 0;
return *((uint32_t *)data);
}
EXPORT_SYMBOL(nft_rule_expr_get_u32);
uint64_t nft_rule_expr_get_u64(const struct nft_rule_expr *expr, uint16_t type)
{
const void *data;
uint32_t data_len;
data = nft_rule_expr_get(expr, type, &data_len);
if (data == NULL)
return 0;
if (data_len != sizeof(uint64_t))
return 0;
return *((uint64_t *)data);
}
EXPORT_SYMBOL(nft_rule_expr_get_u64);
const char *nft_rule_expr_get_str(const struct nft_rule_expr *expr, uint16_t type)
{
uint32_t data_len;
return (const char *)nft_rule_expr_get(expr, type, &data_len);
}
EXPORT_SYMBOL(nft_rule_expr_get_str);
void
nft_rule_expr_build_payload(struct nlmsghdr *nlh, struct nft_rule_expr *expr)
{
struct nlattr *nest1, *nest2;
nest1 = mnl_attr_nest_start(nlh, NFTA_LIST_ELEM);
mnl_attr_put_strz(nlh, NFTA_EXPR_NAME, expr->ops->name);
nest2 = mnl_attr_nest_start(nlh, NFTA_EXPR_DATA);
expr->ops->build(nlh, expr);
mnl_attr_nest_end(nlh, nest2);
mnl_attr_nest_end(nlh, nest1);
}
EXPORT_SYMBOL(nft_rule_expr_build_payload);
int nft_rule_expr_snprintf(char *buf, size_t size, struct nft_rule_expr *expr,
uint32_t type, uint32_t flags)
{
int ret;
unsigned int offset = 0, len = size;
ret = expr->ops->snprintf(buf+offset, len, type, flags, expr);
SNPRINTF_BUFFER_SIZE(ret, size, len, offset);
return offset;
}
EXPORT_SYMBOL(nft_rule_expr_snprintf);
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