2 * test/set flag bits stored in conntrack extension area.
4 * (C) 2013 Astaro GmbH & Co KG
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/ctype.h>
12 #include <linux/export.h>
13 #include <linux/jhash.h>
14 #include <linux/spinlock.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
18 #include <net/netfilter/nf_conntrack_ecache.h>
19 #include <net/netfilter/nf_conntrack_labels.h>
21 static unsigned int label_bits(const struct nf_conn_labels *l)
23 unsigned int longs = l->words;
24 return longs * BITS_PER_LONG;
27 bool nf_connlabel_match(const struct nf_conn *ct, u16 bit)
29 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
34 return bit < label_bits(labels) && test_bit(bit, labels->bits);
36 EXPORT_SYMBOL_GPL(nf_connlabel_match);
38 int nf_connlabel_set(struct nf_conn *ct, u16 bit)
40 struct nf_conn_labels *labels = nf_ct_labels_find(ct);
42 if (!labels || bit >= label_bits(labels))
45 if (test_bit(bit, labels->bits))
48 if (test_and_set_bit(bit, labels->bits))
49 nf_conntrack_event_cache(IPCT_LABEL, ct);
53 EXPORT_SYMBOL_GPL(nf_connlabel_set);
55 static struct nf_ct_ext_type labels_extend __read_mostly = {
56 .len = sizeof(struct nf_conn_labels),
57 .align = __alignof__(struct nf_conn_labels),
58 .id = NF_CT_EXT_LABELS,
61 int nf_conntrack_labels_init(struct net *net)
63 if (net_eq(net, &init_net))
64 return nf_ct_extend_register(&labels_extend);
68 void nf_conntrack_labels_fini(struct net *net)
70 if (net_eq(net, &init_net))
71 nf_ct_extend_unregister(&labels_extend);