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/*
* test/set flag bits stored in conntrack extension area.
*
* (C) 2013 Astaro GmbH & Co KG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/ctype.h>
#include <linux/export.h>
#include <linux/jhash.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_labels.h>
static unsigned int label_bits(const struct nf_conn_labels *l)
{
unsigned int longs = l->words;
return longs * BITS_PER_LONG;
}
bool nf_connlabel_match(const struct nf_conn *ct, u16 bit)
{
struct nf_conn_labels *labels = nf_ct_labels_find(ct);
if (!labels)
return false;
return bit < label_bits(labels) && test_bit(bit, labels->bits);
}
EXPORT_SYMBOL_GPL(nf_connlabel_match);
int nf_connlabel_set(struct nf_conn *ct, u16 bit)
{
struct nf_conn_labels *labels = nf_ct_labels_find(ct);
if (!labels || bit >= label_bits(labels))
return -ENOSPC;
if (test_bit(bit, labels->bits))
return 0;
if (test_and_set_bit(bit, labels->bits))
nf_conntrack_event_cache(IPCT_LABEL, ct);
return 0;
}
EXPORT_SYMBOL_GPL(nf_connlabel_set);
static struct nf_ct_ext_type labels_extend __read_mostly = {
.len = sizeof(struct nf_conn_labels),
.align = __alignof__(struct nf_conn_labels),
.id = NF_CT_EXT_LABELS,
};
int nf_conntrack_labels_init(struct net *net)
{
if (net_eq(net, &init_net))
return nf_ct_extend_register(&labels_extend);
return 0;
}
void nf_conntrack_labels_fini(struct net *net)
{
if (net_eq(net, &init_net))
nf_ct_extend_unregister(&labels_extend);
}
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