2 * Copyright (C)2003,2004 USAGI/WIDE Project
4 * Header for use in defining a given L3 protocol for connection tracking.
7 * Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
9 * Derived from include/netfilter_ipv4/ip_conntrack_protocol.h
12 #ifndef _NF_CONNTRACK_L3PROTO_H
13 #define _NF_CONNTRACK_L3PROTO_H
14 #include <linux/seq_file.h>
15 #include <net/netfilter/nf_conntrack.h>
19 struct nf_conntrack_l3proto
22 struct list_head list
;
24 /* L3 Protocol Family number. ex) PF_INET */
31 * Try to fill in the third arg: nhoff is offset of l3 proto
32 * hdr. Return true if possible.
34 int (*pkt_to_tuple
)(const struct sk_buff
*skb
, unsigned int nhoff
,
35 struct nf_conntrack_tuple
*tuple
);
38 * Invert the per-proto part of the tuple: ie. turn xmit into reply.
39 * Some packets can't be inverted: return 0 in that case.
41 int (*invert_tuple
)(struct nf_conntrack_tuple
*inverse
,
42 const struct nf_conntrack_tuple
*orig
);
44 /* Print out the per-protocol part of the tuple. */
45 int (*print_tuple
)(struct seq_file
*s
,
46 const struct nf_conntrack_tuple
*);
48 /* Print out the private part of the conntrack. */
49 int (*print_conntrack
)(struct seq_file
*s
, const struct nf_conn
*);
51 /* Returns verdict for packet, or -1 for invalid. */
52 int (*packet
)(struct nf_conn
*conntrack
,
53 const struct sk_buff
*skb
,
54 enum ip_conntrack_info ctinfo
);
57 * Called when a new connection for this protocol found;
58 * returns TRUE if it's OK. If so, packet() called next.
60 int (*new)(struct nf_conn
*conntrack
, const struct sk_buff
*skb
);
62 /* Called when a conntrack entry is destroyed */
63 void (*destroy
)(struct nf_conn
*conntrack
);
66 * Called before tracking.
67 * *dataoff: offset of protocol header (TCP, UDP,...) in *pskb
68 * *protonum: protocol number
70 int (*prepare
)(struct sk_buff
**pskb
, unsigned int hooknum
,
71 unsigned int *dataoff
, u_int8_t
*protonum
);
73 u_int32_t (*get_features
)(const struct nf_conntrack_tuple
*tuple
);
75 int (*tuple_to_nfattr
)(struct sk_buff
*skb
,
76 const struct nf_conntrack_tuple
*t
);
78 int (*nfattr_to_tuple
)(struct nfattr
*tb
[],
79 struct nf_conntrack_tuple
*t
);
81 /* Module (if any) which this is connected to. */
85 extern struct nf_conntrack_l3proto
*nf_ct_l3protos
[AF_MAX
];
87 /* Protocol registration. */
88 extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto
*proto
);
89 extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto
*proto
);
91 static inline struct nf_conntrack_l3proto
*
92 __nf_ct_l3proto_find(u_int16_t l3proto
)
94 return nf_ct_l3protos
[l3proto
];
97 extern struct nf_conntrack_l3proto
*
98 nf_ct_l3proto_find_get(u_int16_t l3proto
);
100 extern void nf_ct_l3proto_put(struct nf_conntrack_l3proto
*p
);
102 /* Existing built-in protocols */
103 extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4
;
104 extern struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv6
;
105 extern struct nf_conntrack_l3proto nf_conntrack_generic_l3proto
;
106 #endif /*_NF_CONNTRACK_L3PROTO_H*/