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/*
* (C) 2016 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.
*/
#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_last {
uint64_t msecs;
uint32_t set;
};
static int nftnl_expr_last_set(struct nftnl_expr *e, uint16_t type,
const void *data, uint32_t data_len)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
switch (type) {
case NFTNL_EXPR_LAST_MSECS:
memcpy(&last->msecs, data, sizeof(last->msecs));
break;
case NFTNL_EXPR_LAST_SET:
memcpy(&last->set, data, sizeof(last->set));
break;
default:
return -1;
}
return 0;
}
static const void *nftnl_expr_last_get(const struct nftnl_expr *e,
uint16_t type, uint32_t *data_len)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
switch (type) {
case NFTNL_EXPR_LAST_MSECS:
*data_len = sizeof(last->msecs);
return &last->msecs;
case NFTNL_EXPR_LAST_SET:
*data_len = sizeof(last->set);
return &last->set;
}
return NULL;
}
static int nftnl_expr_last_cb(const struct nlattr *attr, void *data)
{
int type = mnl_attr_get_type(attr);
const struct nlattr **tb = data;
if (mnl_attr_type_valid(attr, NFTA_LAST_MAX) < 0)
return MNL_CB_OK;
switch(type) {
case NFTA_LAST_MSECS:
if (mnl_attr_validate(attr, MNL_TYPE_U64) < 0)
abi_breakage();
break;
case NFTA_LAST_SET:
if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
abi_breakage();
break;
}
tb[type] = attr;
return MNL_CB_OK;
}
static void
nftnl_expr_last_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
if (e->flags & (1 << NFTNL_EXPR_LAST_MSECS))
mnl_attr_put_u64(nlh, NFTA_LAST_MSECS, htobe64(last->msecs));
if (e->flags & (1 << NFTNL_EXPR_LAST_SET))
mnl_attr_put_u32(nlh, NFTA_LAST_SET, htonl(last->set));
}
static int
nftnl_expr_last_parse(struct nftnl_expr *e, struct nlattr *attr)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
struct nlattr *tb[NFTA_LAST_MAX + 1] = {};
if (mnl_attr_parse_nested(attr, nftnl_expr_last_cb, tb) < 0)
return -1;
if (tb[NFTA_LAST_MSECS]) {
last->msecs = be64toh(mnl_attr_get_u64(tb[NFTA_LAST_MSECS]));
e->flags |= (1 << NFTNL_EXPR_LAST_MSECS);
}
if (tb[NFTA_LAST_SET]) {
last->set = ntohl(mnl_attr_get_u32(tb[NFTA_LAST_SET]));
e->flags |= (1 << NFTNL_EXPR_LAST_SET);
}
return 0;
}
static int nftnl_expr_last_snprintf(char *buf, size_t len,
uint32_t flags,
const struct nftnl_expr *e)
{
struct nftnl_expr_last *last = nftnl_expr_data(e);
if (!last->set)
return snprintf(buf, len, "never ");
return snprintf(buf, len, "%"PRIu64" ", last->msecs);
}
struct expr_ops expr_ops_last = {
.name = "last",
.alloc_len = sizeof(struct nftnl_expr_last),
.max_attr = NFTA_LAST_MAX,
.set = nftnl_expr_last_set,
.get = nftnl_expr_last_get,
.parse = nftnl_expr_last_parse,
.build = nftnl_expr_last_build,
.snprintf = nftnl_expr_last_snprintf,
};
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