![Gao feng](/assets/img/avatar_default.png)
Move the global initial codes to the module_init/exit context. Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
113 lines
2.5 KiB
C
113 lines
2.5 KiB
C
/*
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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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nf_conntrack_event_cache(IPCT_LABEL, ct);
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return 0;
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}
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EXPORT_SYMBOL_GPL(nf_connlabel_set);
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#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
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static void replace_u32(u32 *address, u32 mask, u32 new)
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{
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u32 old, tmp;
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do {
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old = *address;
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tmp = (old & mask) ^ new;
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} while (cmpxchg(address, old, tmp) != old);
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}
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int nf_connlabels_replace(struct nf_conn *ct,
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const u32 *data,
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const u32 *mask, unsigned int words32)
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{
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struct nf_conn_labels *labels;
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unsigned int size, i;
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u32 *dst;
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labels = nf_ct_labels_find(ct);
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if (!labels)
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return -ENOSPC;
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size = labels->words * sizeof(long);
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if (size < (words32 * sizeof(u32)))
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words32 = size / sizeof(u32);
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dst = (u32 *) labels->bits;
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if (words32) {
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for (i = 0; i < words32; i++)
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replace_u32(&dst[i], mask ? ~mask[i] : 0, data[i]);
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}
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size /= sizeof(u32);
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for (i = words32; i < size; i++) /* pad */
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replace_u32(&dst[i], 0, 0);
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nf_conntrack_event_cache(IPCT_LABEL, ct);
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return 0;
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}
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EXPORT_SYMBOL_GPL(nf_connlabels_replace);
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#endif
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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(void)
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{
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return nf_ct_extend_register(&labels_extend);
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}
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void nf_conntrack_labels_fini(void)
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{
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nf_ct_extend_unregister(&labels_extend);
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}
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