| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 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 |