1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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2 | |
3 | #ifndef _NF_CONNTRACK_LABELS_H |
4 | #define _NF_CONNTRACK_LABELS_H |
5 | |
6 | #include <linux/netfilter/nf_conntrack_common.h> |
7 | #include <linux/netfilter/nf_conntrack_tuple_common.h> |
8 | #include <linux/types.h> |
9 | #include <net/net_namespace.h> |
10 | #include <net/netfilter/nf_conntrack.h> |
11 | #include <net/netfilter/nf_conntrack_extend.h> |
12 | #include <uapi/linux/netfilter/xt_connlabel.h> |
13 | |
14 | #define NF_CT_LABELS_MAX_SIZE ((XT_CONNLABEL_MAXBIT + 1) / BITS_PER_BYTE) |
15 | |
16 | struct nf_conn_labels { |
17 | unsigned long bits[NF_CT_LABELS_MAX_SIZE / sizeof(long)]; |
18 | }; |
19 | |
20 | /* Can't use nf_ct_ext_find(), flow dissector cannot use symbols |
21 | * exported by nf_conntrack module. |
22 | */ |
23 | static inline struct nf_conn_labels *nf_ct_labels_find(const struct nf_conn *ct) |
24 | { |
25 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
26 | struct nf_ct_ext *ext = ct->ext; |
27 | |
28 | if (!ext || !__nf_ct_ext_exist(ext, id: NF_CT_EXT_LABELS)) |
29 | return NULL; |
30 | |
31 | return (void *)ct->ext + ct->ext->offset[NF_CT_EXT_LABELS]; |
32 | #else |
33 | return NULL; |
34 | #endif |
35 | } |
36 | |
37 | static inline struct nf_conn_labels *nf_ct_labels_ext_add(struct nf_conn *ct) |
38 | { |
39 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
40 | struct net *net = nf_ct_net(ct); |
41 | |
42 | if (atomic_read(v: &net->ct.labels_used) == 0) |
43 | return NULL; |
44 | |
45 | return nf_ct_ext_add(ct, id: NF_CT_EXT_LABELS, GFP_ATOMIC); |
46 | #else |
47 | return NULL; |
48 | #endif |
49 | } |
50 | |
51 | int nf_connlabels_replace(struct nf_conn *ct, |
52 | const u32 *data, const u32 *mask, unsigned int words); |
53 | |
54 | #ifdef CONFIG_NF_CONNTRACK_LABELS |
55 | int nf_connlabels_get(struct net *net, unsigned int bit); |
56 | void nf_connlabels_put(struct net *net); |
57 | #else |
58 | static inline int nf_connlabels_get(struct net *net, unsigned int bit) { return 0; } |
59 | static inline void nf_connlabels_put(struct net *net) {} |
60 | #endif |
61 | |
62 | #endif /* _NF_CONNTRACK_LABELS_H */ |
63 |