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Commit | Line | Data |
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c539f017 FW |
1 | /* |
2 | * test/set flag bits stored in conntrack extension area. | |
3 | * | |
4 | * (C) 2013 Astaro GmbH & Co KG | |
5 | * | |
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. | |
9 | */ | |
10 | ||
c539f017 | 11 | #include <linux/export.h> |
c539f017 | 12 | #include <linux/types.h> |
c539f017 FW |
13 | |
14 | #include <net/netfilter/nf_conntrack_ecache.h> | |
15 | #include <net/netfilter/nf_conntrack_labels.h> | |
16 | ||
86ca02e7 JS |
17 | static spinlock_t nf_connlabels_lock; |
18 | ||
5a8145f7 | 19 | static int replace_u32(u32 *address, u32 mask, u32 new) |
9b21f6a9 FW |
20 | { |
21 | u32 old, tmp; | |
22 | ||
23 | do { | |
24 | old = *address; | |
25 | tmp = (old & mask) ^ new; | |
5a8145f7 FW |
26 | if (old == tmp) |
27 | return 0; | |
9b21f6a9 | 28 | } while (cmpxchg(address, old, tmp) != old); |
5a8145f7 FW |
29 | |
30 | return 1; | |
9b21f6a9 FW |
31 | } |
32 | ||
33 | int nf_connlabels_replace(struct nf_conn *ct, | |
34 | const u32 *data, | |
35 | const u32 *mask, unsigned int words32) | |
36 | { | |
37 | struct nf_conn_labels *labels; | |
38 | unsigned int size, i; | |
5a8145f7 | 39 | int changed = 0; |
9b21f6a9 FW |
40 | u32 *dst; |
41 | ||
42 | labels = nf_ct_labels_find(ct); | |
43 | if (!labels) | |
44 | return -ENOSPC; | |
45 | ||
23014011 | 46 | size = sizeof(labels->bits); |
9b21f6a9 FW |
47 | if (size < (words32 * sizeof(u32))) |
48 | words32 = size / sizeof(u32); | |
49 | ||
50 | dst = (u32 *) labels->bits; | |
5a8145f7 FW |
51 | for (i = 0; i < words32; i++) |
52 | changed |= replace_u32(&dst[i], mask ? ~mask[i] : 0, data[i]); | |
9b21f6a9 FW |
53 | |
54 | size /= sizeof(u32); | |
55 | for (i = words32; i < size; i++) /* pad */ | |
56 | replace_u32(&dst[i], 0, 0); | |
57 | ||
5a8145f7 FW |
58 | if (changed) |
59 | nf_conntrack_event_cache(IPCT_LABEL, ct); | |
9b21f6a9 FW |
60 | return 0; |
61 | } | |
62 | EXPORT_SYMBOL_GPL(nf_connlabels_replace); | |
9b21f6a9 | 63 | |
adff6c65 | 64 | int nf_connlabels_get(struct net *net, unsigned int bits) |
86ca02e7 | 65 | { |
23014011 | 66 | if (BIT_WORD(bits) >= NF_CT_LABELS_MAX_SIZE / sizeof(long)) |
86ca02e7 JS |
67 | return -ERANGE; |
68 | ||
86ca02e7 JS |
69 | spin_lock(&nf_connlabels_lock); |
70 | net->ct.labels_used++; | |
86ca02e7 JS |
71 | spin_unlock(&nf_connlabels_lock); |
72 | ||
73 | return 0; | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(nf_connlabels_get); | |
76 | ||
77 | void nf_connlabels_put(struct net *net) | |
78 | { | |
79 | spin_lock(&nf_connlabels_lock); | |
80 | net->ct.labels_used--; | |
86ca02e7 JS |
81 | spin_unlock(&nf_connlabels_lock); |
82 | } | |
83 | EXPORT_SYMBOL_GPL(nf_connlabels_put); | |
84 | ||
c539f017 FW |
85 | static struct nf_ct_ext_type labels_extend __read_mostly = { |
86 | .len = sizeof(struct nf_conn_labels), | |
87 | .align = __alignof__(struct nf_conn_labels), | |
88 | .id = NF_CT_EXT_LABELS, | |
89 | }; | |
90 | ||
5f69b8f5 | 91 | int nf_conntrack_labels_init(void) |
c539f017 | 92 | { |
adff6c65 FW |
93 | BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE / sizeof(long) >= U8_MAX); |
94 | ||
86ca02e7 | 95 | spin_lock_init(&nf_connlabels_lock); |
5f69b8f5 | 96 | return nf_ct_extend_register(&labels_extend); |
c539f017 FW |
97 | } |
98 | ||
5f69b8f5 | 99 | void nf_conntrack_labels_fini(void) |
c539f017 | 100 | { |
5f69b8f5 | 101 | nf_ct_extend_unregister(&labels_extend); |
c539f017 | 102 | } |