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 | ||
c539f017 FW |
19 | int nf_connlabel_set(struct nf_conn *ct, u16 bit) |
20 | { | |
21 | struct nf_conn_labels *labels = nf_ct_labels_find(ct); | |
22 | ||
b4ef1599 | 23 | if (!labels || BIT_WORD(bit) >= labels->words) |
c539f017 FW |
24 | return -ENOSPC; |
25 | ||
26 | if (test_bit(bit, labels->bits)) | |
27 | return 0; | |
28 | ||
797a7d66 | 29 | if (!test_and_set_bit(bit, labels->bits)) |
0ceabd83 | 30 | nf_conntrack_event_cache(IPCT_LABEL, ct); |
c539f017 FW |
31 | |
32 | return 0; | |
33 | } | |
34 | EXPORT_SYMBOL_GPL(nf_connlabel_set); | |
35 | ||
5a8145f7 | 36 | static int replace_u32(u32 *address, u32 mask, u32 new) |
9b21f6a9 FW |
37 | { |
38 | u32 old, tmp; | |
39 | ||
40 | do { | |
41 | old = *address; | |
42 | tmp = (old & mask) ^ new; | |
5a8145f7 FW |
43 | if (old == tmp) |
44 | return 0; | |
9b21f6a9 | 45 | } while (cmpxchg(address, old, tmp) != old); |
5a8145f7 FW |
46 | |
47 | return 1; | |
9b21f6a9 FW |
48 | } |
49 | ||
50 | int nf_connlabels_replace(struct nf_conn *ct, | |
51 | const u32 *data, | |
52 | const u32 *mask, unsigned int words32) | |
53 | { | |
54 | struct nf_conn_labels *labels; | |
55 | unsigned int size, i; | |
5a8145f7 | 56 | int changed = 0; |
9b21f6a9 FW |
57 | u32 *dst; |
58 | ||
59 | labels = nf_ct_labels_find(ct); | |
60 | if (!labels) | |
61 | return -ENOSPC; | |
62 | ||
63 | size = labels->words * sizeof(long); | |
64 | if (size < (words32 * sizeof(u32))) | |
65 | words32 = size / sizeof(u32); | |
66 | ||
67 | dst = (u32 *) labels->bits; | |
5a8145f7 FW |
68 | for (i = 0; i < words32; i++) |
69 | changed |= replace_u32(&dst[i], mask ? ~mask[i] : 0, data[i]); | |
9b21f6a9 FW |
70 | |
71 | size /= sizeof(u32); | |
72 | for (i = words32; i < size; i++) /* pad */ | |
73 | replace_u32(&dst[i], 0, 0); | |
74 | ||
5a8145f7 FW |
75 | if (changed) |
76 | nf_conntrack_event_cache(IPCT_LABEL, ct); | |
9b21f6a9 FW |
77 | return 0; |
78 | } | |
79 | EXPORT_SYMBOL_GPL(nf_connlabels_replace); | |
9b21f6a9 | 80 | |
adff6c65 | 81 | int nf_connlabels_get(struct net *net, unsigned int bits) |
86ca02e7 JS |
82 | { |
83 | size_t words; | |
84 | ||
adff6c65 FW |
85 | words = BIT_WORD(bits) + 1; |
86 | if (words > NF_CT_LABELS_MAX_SIZE / sizeof(long)) | |
86ca02e7 JS |
87 | return -ERANGE; |
88 | ||
86ca02e7 JS |
89 | spin_lock(&nf_connlabels_lock); |
90 | net->ct.labels_used++; | |
91 | if (words > net->ct.label_words) | |
92 | net->ct.label_words = words; | |
93 | spin_unlock(&nf_connlabels_lock); | |
94 | ||
95 | return 0; | |
96 | } | |
97 | EXPORT_SYMBOL_GPL(nf_connlabels_get); | |
98 | ||
99 | void nf_connlabels_put(struct net *net) | |
100 | { | |
101 | spin_lock(&nf_connlabels_lock); | |
102 | net->ct.labels_used--; | |
103 | if (net->ct.labels_used == 0) | |
104 | net->ct.label_words = 0; | |
105 | spin_unlock(&nf_connlabels_lock); | |
106 | } | |
107 | EXPORT_SYMBOL_GPL(nf_connlabels_put); | |
108 | ||
c539f017 FW |
109 | static struct nf_ct_ext_type labels_extend __read_mostly = { |
110 | .len = sizeof(struct nf_conn_labels), | |
111 | .align = __alignof__(struct nf_conn_labels), | |
112 | .id = NF_CT_EXT_LABELS, | |
113 | }; | |
114 | ||
5f69b8f5 | 115 | int nf_conntrack_labels_init(void) |
c539f017 | 116 | { |
adff6c65 FW |
117 | BUILD_BUG_ON(NF_CT_LABELS_MAX_SIZE / sizeof(long) >= U8_MAX); |
118 | ||
86ca02e7 | 119 | spin_lock_init(&nf_connlabels_lock); |
5f69b8f5 | 120 | return nf_ct_extend_register(&labels_extend); |
c539f017 FW |
121 | } |
122 | ||
5f69b8f5 | 123 | void nf_conntrack_labels_fini(void) |
c539f017 | 124 | { |
5f69b8f5 | 125 | nf_ct_extend_unregister(&labels_extend); |
c539f017 | 126 | } |