xref: /openbmc/linux/include/net/netfilter/nf_conntrack_timeout.h (revision 4f2c0a4acffbec01079c28f839422e64ddeff004)
1  /* SPDX-License-Identifier: GPL-2.0 */
2  #ifndef _NF_CONNTRACK_TIMEOUT_H
3  #define _NF_CONNTRACK_TIMEOUT_H
4  
5  #include <net/net_namespace.h>
6  #include <linux/netfilter/nf_conntrack_common.h>
7  #include <linux/netfilter/nf_conntrack_tuple_common.h>
8  #include <linux/refcount.h>
9  #include <net/netfilter/nf_conntrack.h>
10  #include <net/netfilter/nf_conntrack_extend.h>
11  
12  #define CTNL_TIMEOUT_NAME_MAX	32
13  
14  struct nf_ct_timeout {
15  	__u16			l3num;
16  	const struct nf_conntrack_l4proto *l4proto;
17  	char			data[];
18  };
19  
20  struct nf_conn_timeout {
21  	struct nf_ct_timeout __rcu *timeout;
22  };
23  
24  static inline unsigned int *
nf_ct_timeout_data(const struct nf_conn_timeout * t)25  nf_ct_timeout_data(const struct nf_conn_timeout *t)
26  {
27  #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
28  	struct nf_ct_timeout *timeout;
29  
30  	timeout = rcu_dereference(t->timeout);
31  	if (timeout == NULL)
32  		return NULL;
33  
34  	return (unsigned int *)timeout->data;
35  #else
36  	return NULL;
37  #endif
38  }
39  
40  static inline
nf_ct_timeout_find(const struct nf_conn * ct)41  struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
42  {
43  #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
44  	return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
45  #else
46  	return NULL;
47  #endif
48  }
49  
50  static inline
nf_ct_timeout_ext_add(struct nf_conn * ct,struct nf_ct_timeout * timeout,gfp_t gfp)51  struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
52  					      struct nf_ct_timeout *timeout,
53  					      gfp_t gfp)
54  {
55  #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
56  	struct nf_conn_timeout *timeout_ext;
57  
58  	timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
59  	if (timeout_ext == NULL)
60  		return NULL;
61  
62  	rcu_assign_pointer(timeout_ext->timeout, timeout);
63  
64  	return timeout_ext;
65  #else
66  	return NULL;
67  #endif
68  };
69  
nf_ct_timeout_lookup(const struct nf_conn * ct)70  static inline unsigned int *nf_ct_timeout_lookup(const struct nf_conn *ct)
71  {
72  	unsigned int *timeouts = NULL;
73  #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
74  	struct nf_conn_timeout *timeout_ext;
75  
76  	timeout_ext = nf_ct_timeout_find(ct);
77  	if (timeout_ext)
78  		timeouts = nf_ct_timeout_data(timeout_ext);
79  #endif
80  	return timeouts;
81  }
82  
83  #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
84  void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout);
85  int nf_ct_set_timeout(struct net *net, struct nf_conn *ct, u8 l3num, u8 l4num,
86  		      const char *timeout_name);
87  void nf_ct_destroy_timeout(struct nf_conn *ct);
88  #else
nf_ct_set_timeout(struct net * net,struct nf_conn * ct,u8 l3num,u8 l4num,const char * timeout_name)89  static inline int nf_ct_set_timeout(struct net *net, struct nf_conn *ct,
90  				    u8 l3num, u8 l4num,
91  				    const char *timeout_name)
92  {
93  	return -EOPNOTSUPP;
94  }
95  
nf_ct_destroy_timeout(struct nf_conn * ct)96  static inline void nf_ct_destroy_timeout(struct nf_conn *ct)
97  {
98  	return;
99  }
100  #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
101  
102  #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
103  struct nf_ct_timeout_hooks {
104  	struct nf_ct_timeout *(*timeout_find_get)(struct net *net, const char *name);
105  	void (*timeout_put)(struct nf_ct_timeout *timeout);
106  };
107  
108  extern const struct nf_ct_timeout_hooks __rcu *nf_ct_timeout_hook;
109  #endif
110  
111  #endif /* _NF_CONNTRACK_TIMEOUT_H */
112