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