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
,
42 unsigned int hooknum
);
44 /* Called when a new connection for this protocol found;
45 * returns TRUE if it's OK. If so, packet() called next. */
46 bool (*new)(struct nf_conn
*ct
, const struct sk_buff
*skb
,
47 unsigned int dataoff
);
49 /* Called when a conntrack entry is destroyed */
50 void (*destroy
)(struct nf_conn
*ct
);
52 int (*error
)(struct net
*net
, struct sk_buff
*skb
, unsigned int dataoff
,
53 enum ip_conntrack_info
*ctinfo
,
54 u_int8_t pf
, unsigned int hooknum
);
56 /* Print out the per-protocol part of the tuple. Return like seq_* */
57 int (*print_tuple
)(struct seq_file
*s
,
58 const struct nf_conntrack_tuple
*);
60 /* Print out the private part of the conntrack. */
61 int (*print_conntrack
)(struct seq_file
*s
, struct nf_conn
*);
63 /* convert protoinfo to nfnetink attributes */
64 int (*to_nlattr
)(struct sk_buff
*skb
, struct nlattr
*nla
,
66 /* Calculate protoinfo nlattr size */
67 int (*nlattr_size
)(void);
69 /* convert nfnetlink attributes to protoinfo */
70 int (*from_nlattr
)(struct nlattr
*tb
[], struct nf_conn
*ct
);
72 int (*tuple_to_nlattr
)(struct sk_buff
*skb
,
73 const struct nf_conntrack_tuple
*t
);
74 /* Calculate tuple nlattr size */
75 int (*nlattr_tuple_size
)(void);
76 int (*nlattr_to_tuple
)(struct nlattr
*tb
[],
77 struct nf_conntrack_tuple
*t
);
78 const struct nla_policy
*nla_policy
;
83 struct ctl_table_header
**ctl_table_header
;
84 struct ctl_table
*ctl_table
;
85 unsigned int *ctl_table_users
;
86 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
87 struct ctl_table_header
*ctl_compat_table_header
;
88 struct ctl_table
*ctl_compat_table
;
94 /* Module (if any) which this is connected to. */
98 /* Existing built-in generic protocol */
99 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic
;
101 #define MAX_NF_CT_PROTO 256
103 extern struct nf_conntrack_l4proto
*
104 __nf_ct_l4proto_find(u_int16_t l3proto
, u_int8_t l4proto
);
106 /* Protocol registration. */
107 extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto
*proto
);
108 extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto
*proto
);
110 /* Generic netlink helpers */
111 extern int nf_ct_port_tuple_to_nlattr(struct sk_buff
*skb
,
112 const struct nf_conntrack_tuple
*tuple
);
113 extern int nf_ct_port_nlattr_to_tuple(struct nlattr
*tb
[],
114 struct nf_conntrack_tuple
*t
);
115 extern int nf_ct_port_nlattr_tuple_size(void);
116 extern const struct nla_policy nf_ct_port_nla_policy
[];
119 #ifdef DEBUG_INVALID_PACKETS
120 #define LOG_INVALID(net, proto) \
121 ((net)->ct.sysctl_log_invalid == (proto) || \
122 (net)->ct.sysctl_log_invalid == IPPROTO_RAW)
124 #define LOG_INVALID(net, proto) \
125 (((net)->ct.sysctl_log_invalid == (proto) || \
126 (net)->ct.sysctl_log_invalid == IPPROTO_RAW) \
130 static inline int LOG_INVALID(struct net
*net
, int proto
) { return 0; }
131 #endif /* CONFIG_SYSCTL */
133 #endif /*_NF_CONNTRACK_PROTOCOL_H*/