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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 <stdio.h>
#include <stdint.h>
#include <arpa/inet.h>
#include <errno.h>
#include <inttypes.h>
#include <linux/netfilter/nf_tables.h>
#include "internal.h"
#include <libmnl/libmnl.h>
#include <libnftnl/expr.h>
#include <libnftnl/rule.h>
struct nftnl_expr_counter {
uint64_t pkts;
uint64_t bytes;
};
static int
nftnl_expr_counter_set(struct nftnl_expr *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
switch(type) {
case NFTNL_EXPR_CTR_BYTES:
memcpy(&ctr->bytes, data, sizeof(ctr->bytes));
break;
case NFTNL_EXPR_CTR_PACKETS:
memcpy(&ctr->pkts, data, sizeof(ctr->pkts));
break;
default:
return -1;
}
return 0;
}
static const void *
nftnl_expr_counter_get(const struct nftnl_expr *e, uint16_t type,
uint32_t *data_len)
{
struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
switch(type) {
case NFTNL_EXPR_CTR_BYTES:
*data_len = sizeof(ctr->bytes);
return &ctr->bytes;
case NFTNL_EXPR_CTR_PACKETS:
*data_len = sizeof(ctr->pkts);
return &ctr->pkts;
}
return NULL;
}
static int nftnl_expr_counter_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_COUNTER_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_COUNTER_BYTES:
case NFTA_COUNTER_PACKETS:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void
nftnl_expr_counter_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
{
struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
if (e->flags & (1 << NFTNL_EXPR_CTR_BYTES))
mnl_attr_put_u64(nlh, NFTA_COUNTER_BYTES, htobe64(ctr->bytes));
if (e->flags & (1 << NFTNL_EXPR_CTR_PACKETS))
mnl_attr_put_u64(nlh, NFTA_COUNTER_PACKETS, htobe64(ctr->pkts));
}
static int
nftnl_expr_counter_parse(struct nftnl_expr *e, struct nlattr *attr)
{
struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
struct nlattr *tb[NFTA_COUNTER_MAX+1] = {};
if (mnl_attr_parse_nested(attr, nftnl_expr_counter_cb, tb) < 0)
return -1;
if (tb[NFTA_COUNTER_BYTES]) {
ctr->bytes = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_BYTES]));
e->flags |= (1 << NFTNL_EXPR_CTR_BYTES);
}
if (tb[NFTA_COUNTER_PACKETS]) {
ctr->pkts = be64toh(mnl_attr_get_u64(tb[NFTA_COUNTER_PACKETS]));
e->flags |= (1 << NFTNL_EXPR_CTR_PACKETS);
}
return 0;
}
static int nftnl_expr_counter_snprintf(char *buf, size_t len,
uint32_t flags,
const struct nftnl_expr *e)
{
struct nftnl_expr_counter *ctr = nftnl_expr_data(e);
return snprintf(buf, len, "pkts %"PRIu64" bytes %"PRIu64" ",
ctr->pkts, ctr->bytes);
}
struct expr_ops expr_ops_counter = {
.name = "counter",
.alloc_len = sizeof(struct nftnl_expr_counter),
.max_attr = NFTA_COUNTER_MAX,
.set = nftnl_expr_counter_set,
.get = nftnl_expr_counter_get,
.parse = nftnl_expr_counter_parse,
.build = nftnl_expr_counter_build,
.output = nftnl_expr_counter_snprintf,
};
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