https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 2241ab53cbb5cdb08a6b2d4688feb13971058f65 authored by Linus Torvalds on 22 January 2023, 00:27:01 UTC
Linux 6.2-rc5
Linux 6.2-rc5
Tip revision: 2241ab5
nf_conntrack_labels.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* test/set flag bits stored in conntrack extension area.
*
* (C) 2013 Astaro GmbH & Co KG
*/
#include <linux/export.h>
#include <linux/types.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_labels.h>
static DEFINE_SPINLOCK(nf_connlabels_lock);
static int replace_u32(u32 *address, u32 mask, u32 new)
{
u32 old, tmp;
do {
old = *address;
tmp = (old & mask) ^ new;
if (old == tmp)
return 0;
} while (cmpxchg(address, old, tmp) != old);
return 1;
}
int nf_connlabels_replace(struct nf_conn *ct,
const u32 *data,
const u32 *mask, unsigned int words32)
{
struct nf_conn_labels *labels;
unsigned int size, i;
int changed = 0;
u32 *dst;
labels = nf_ct_labels_find(ct);
if (!labels)
return -ENOSPC;
size = sizeof(labels->bits);
if (size < (words32 * sizeof(u32)))
words32 = size / sizeof(u32);
dst = (u32 *) labels->bits;
for (i = 0; i < words32; i++)
changed |= replace_u32(&dst[i], mask ? ~mask[i] : 0, data[i]);
size /= sizeof(u32);
for (i = words32; i < size; i++) /* pad */
replace_u32(&dst[i], 0, 0);
if (changed)
nf_conntrack_event_cache(IPCT_LABEL, ct);
return 0;
}
EXPORT_SYMBOL_GPL(nf_connlabels_replace);
int nf_connlabels_get(struct net *net, unsigned int bits)
{
if (BIT_WORD(bits) >= NF_CT_LABELS_MAX_SIZE / sizeof(long))
return -ERANGE;
spin_lock(&nf_connlabels_lock);
net->ct.labels_used++;
spin_unlock(&nf_connlabels_lock);
BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE / sizeof(long) >= U8_MAX);
return 0;
}
EXPORT_SYMBOL_GPL(nf_connlabels_get);
void nf_connlabels_put(struct net *net)
{
spin_lock(&nf_connlabels_lock);
net->ct.labels_used--;
spin_unlock(&nf_connlabels_lock);
}
EXPORT_SYMBOL_GPL(nf_connlabels_put);