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Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c539f017 FW |
2 | /* |
3 | * test/set flag bits stored in conntrack extension area. | |
4 | * | |
5 | * (C) 2013 Astaro GmbH & Co KG | |
c539f017 FW |
6 | */ |
7 | ||
c539f017 | 8 | #include <linux/export.h> |
c539f017 | 9 | #include <linux/types.h> |
c539f017 FW |
10 | |
11 | #include <net/netfilter/nf_conntrack_ecache.h> | |
12 | #include <net/netfilter/nf_conntrack_labels.h> | |
13 | ||
5a8145f7 | 14 | static int replace_u32(u32 *address, u32 mask, u32 new) |
9b21f6a9 FW |
15 | { |
16 | u32 old, tmp; | |
17 | ||
18 | do { | |
19 | old = *address; | |
20 | tmp = (old & mask) ^ new; | |
5a8145f7 FW |
21 | if (old == tmp) |
22 | return 0; | |
9b21f6a9 | 23 | } while (cmpxchg(address, old, tmp) != old); |
5a8145f7 FW |
24 | |
25 | return 1; | |
9b21f6a9 FW |
26 | } |
27 | ||
28 | int nf_connlabels_replace(struct nf_conn *ct, | |
29 | const u32 *data, | |
30 | const u32 *mask, unsigned int words32) | |
31 | { | |
32 | struct nf_conn_labels *labels; | |
33 | unsigned int size, i; | |
5a8145f7 | 34 | int changed = 0; |
9b21f6a9 FW |
35 | u32 *dst; |
36 | ||
37 | labels = nf_ct_labels_find(ct); | |
38 | if (!labels) | |
39 | return -ENOSPC; | |
40 | ||
23014011 | 41 | size = sizeof(labels->bits); |
9b21f6a9 FW |
42 | if (size < (words32 * sizeof(u32))) |
43 | words32 = size / sizeof(u32); | |
44 | ||
45 | dst = (u32 *) labels->bits; | |
5a8145f7 FW |
46 | for (i = 0; i < words32; i++) |
47 | changed |= replace_u32(&dst[i], mask ? ~mask[i] : 0, data[i]); | |
9b21f6a9 FW |
48 | |
49 | size /= sizeof(u32); | |
50 | for (i = words32; i < size; i++) /* pad */ | |
51 | replace_u32(&dst[i], 0, 0); | |
52 | ||
5a8145f7 FW |
53 | if (changed) |
54 | nf_conntrack_event_cache(IPCT_LABEL, ct); | |
9b21f6a9 FW |
55 | return 0; |
56 | } | |
57 | EXPORT_SYMBOL_GPL(nf_connlabels_replace); | |
9b21f6a9 | 58 | |
adff6c65 | 59 | int nf_connlabels_get(struct net *net, unsigned int bits) |
86ca02e7 | 60 | { |
643d1260 FW |
61 | int v; |
62 | ||
23014011 | 63 | if (BIT_WORD(bits) >= NF_CT_LABELS_MAX_SIZE / sizeof(long)) |
86ca02e7 JS |
64 | return -ERANGE; |
65 | ||
1015c3de FW |
66 | BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE / sizeof(long) >= U8_MAX); |
67 | ||
643d1260 FW |
68 | v = atomic_inc_return_relaxed(&net->ct.labels_used); |
69 | WARN_ON_ONCE(v <= 0); | |
70 | ||
86ca02e7 JS |
71 | return 0; |
72 | } | |
73 | EXPORT_SYMBOL_GPL(nf_connlabels_get); | |
74 | ||
75 | void nf_connlabels_put(struct net *net) | |
76 | { | |
643d1260 FW |
77 | int v = atomic_dec_return_relaxed(&net->ct.labels_used); |
78 | ||
79 | WARN_ON_ONCE(v < 0); | |
86ca02e7 JS |
80 | } |
81 | EXPORT_SYMBOL_GPL(nf_connlabels_put); |