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, 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 (net->ct.labels_used == 0) 43 return NULL; 44 45 return nf_ct_ext_add(ct, 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_conntrack_labels_init(void); 56 int nf_connlabels_get(struct net *net, unsigned int bit); 57 void nf_connlabels_put(struct net *net); 58 #else 59 static inline int nf_connlabels_get(struct net *net, unsigned int bit) { return 0; } 60 static inline void nf_connlabels_put(struct net *net) {} 61 #endif 62 63 #endif /* _NF_CONNTRACK_LABELS_H */ 64