2 * Header for use in defining a given L4 protocol for connection tracking.
4 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
5 * - generalized L3 protocol dependent part.
7 * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
10 #ifndef _NF_CONNTRACK_L4PROTO_H
11 #define _NF_CONNTRACK_L4PROTO_H
12 #include <linux/netlink.h>
13 #include <net/netlink.h>
14 #include <net/netfilter/nf_conntrack.h>
18 struct nf_conntrack_l4proto
{
19 /* L3 Protocol number. */
22 /* L4 Protocol number. */
25 /* Try to fill in the third arg: dataoff is offset past network protocol
26 hdr. Return true if possible. */
27 bool (*pkt_to_tuple
)(const struct sk_buff
*skb
, unsigned int dataoff
,
28 struct nf_conntrack_tuple
*tuple
);
30 /* Invert the per-proto part of the tuple: ie. turn xmit into reply.
31 * Some packets can't be inverted: return 0 in that case.
33 bool (*invert_tuple
)(struct nf_conntrack_tuple
*inverse
,
34 const struct nf_conntrack_tuple
*orig
);
36 /* Returns verdict for packet, or -1 for invalid. */
37 int (*packet
)(struct nf_conn
*ct
,
38 const struct sk_buff
*skb
,
40 enum ip_conntrack_info ctinfo
,
43 unsigned int *timeouts
);
45 /* Called when a new connection for this protocol found;
46 * returns TRUE if it's OK. If so, packet() called next. */
47 bool (*new)(struct nf_conn
*ct
, const struct sk_buff
*skb
,
48 unsigned int dataoff
, unsigned int *timeouts
);
50 /* Called when a conntrack entry is destroyed */
51 void (*destroy
)(struct nf_conn
*ct
);
53 int (*error
)(struct net
*net
, struct nf_conn
*tmpl
, struct sk_buff
*skb
,
54 unsigned int dataoff
, enum ip_conntrack_info
*ctinfo
,
55 u_int8_t pf
, unsigned int hooknum
);
57 /* Print out the per-protocol part of the tuple. Return like seq_* */
58 int (*print_tuple
)(struct seq_file
*s
,
59 const struct nf_conntrack_tuple
*);
61 /* Print out the private part of the conntrack. */
62 int (*print_conntrack
)(struct seq_file
*s
, struct nf_conn
*);
64 /* Return the array of timeouts for this protocol. */
65 unsigned int *(*get_timeouts
)(struct net
*net
);
67 /* convert protoinfo to nfnetink attributes */
68 int (*to_nlattr
)(struct sk_buff
*skb
, struct nlattr
*nla
,
70 /* Calculate protoinfo nlattr size */
71 int (*nlattr_size
)(void);
73 /* convert nfnetlink attributes to protoinfo */
74 int (*from_nlattr
)(struct nlattr
*tb
[], struct nf_conn
*ct
);
76 int (*tuple_to_nlattr
)(struct sk_buff
*skb
,
77 const struct nf_conntrack_tuple
*t
);
78 /* Calculate tuple nlattr size */
79 int (*nlattr_tuple_size
)(void);
80 int (*nlattr_to_tuple
)(struct nlattr
*tb
[],
81 struct nf_conntrack_tuple
*t
);
82 const struct nla_policy
*nla_policy
;
86 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
89 int (*nlattr_to_obj
)(struct nlattr
*tb
[], void *data
);
90 int (*obj_to_nlattr
)(struct sk_buff
*skb
, const void *data
);
92 unsigned int nlattr_max
;
93 const struct nla_policy
*nla_policy
;
98 struct ctl_table_header
**ctl_table_header
;
99 struct ctl_table
*ctl_table
;
100 unsigned int *ctl_table_users
;
101 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
102 struct ctl_table_header
*ctl_compat_table_header
;
103 struct ctl_table
*ctl_compat_table
;
109 /* Module (if any) which this is connected to. */
113 /* Existing built-in generic protocol */
114 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic
;
116 #define MAX_NF_CT_PROTO 256
118 extern struct nf_conntrack_l4proto
*
119 __nf_ct_l4proto_find(u_int16_t l3proto
, u_int8_t l4proto
);
121 /* Protocol registration. */
122 extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto
*proto
);
123 extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto
*proto
);
125 /* Generic netlink helpers */
126 extern int nf_ct_port_tuple_to_nlattr(struct sk_buff
*skb
,
127 const struct nf_conntrack_tuple
*tuple
);
128 extern int nf_ct_port_nlattr_to_tuple(struct nlattr
*tb
[],
129 struct nf_conntrack_tuple
*t
);
130 extern int nf_ct_port_nlattr_tuple_size(void);
131 extern const struct nla_policy nf_ct_port_nla_policy
[];
134 #ifdef DEBUG_INVALID_PACKETS
135 #define LOG_INVALID(net, proto) \
136 ((net)->ct.sysctl_log_invalid == (proto) || \
137 (net)->ct.sysctl_log_invalid == IPPROTO_RAW)
139 #define LOG_INVALID(net, proto) \
140 (((net)->ct.sysctl_log_invalid == (proto) || \
141 (net)->ct.sysctl_log_invalid == IPPROTO_RAW) \
145 static inline int LOG_INVALID(struct net
*net
, int proto
) { return 0; }
146 #endif /* CONFIG_SYSCTL */
148 #endif /*_NF_CONNTRACK_PROTOCOL_H*/