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/netlink.h>
15 #include <net/netlink.h>
16 #include <linux/seq_file.h>
17 #include <net/netfilter/nf_conntrack.h>
19 struct nf_conntrack_l3proto
{
20 /* L3 Protocol Family number. ex) PF_INET */
27 * Try to fill in the third arg: nhoff is offset of l3 proto
28 * hdr. Return true if possible.
30 bool (*pkt_to_tuple
)(const struct sk_buff
*skb
, unsigned int nhoff
,
31 struct nf_conntrack_tuple
*tuple
);
34 * Invert the per-proto part of the tuple: ie. turn xmit into reply.
35 * Some packets can't be inverted: return 0 in that case.
37 bool (*invert_tuple
)(struct nf_conntrack_tuple
*inverse
,
38 const struct nf_conntrack_tuple
*orig
);
40 /* Print out the per-protocol part of the tuple. */
41 int (*print_tuple
)(struct seq_file
*s
,
42 const struct nf_conntrack_tuple
*);
45 * Called before tracking.
46 * *dataoff: offset of protocol header (TCP, UDP,...) in skb
47 * *protonum: protocol number
49 int (*get_l4proto
)(const struct sk_buff
*skb
, unsigned int nhoff
,
50 unsigned int *dataoff
, u_int8_t
*protonum
);
52 int (*tuple_to_nlattr
)(struct sk_buff
*skb
,
53 const struct nf_conntrack_tuple
*t
);
56 * Calculate size of tuple nlattr
58 int (*nlattr_tuple_size
)(void);
60 int (*nlattr_to_tuple
)(struct nlattr
*tb
[],
61 struct nf_conntrack_tuple
*t
);
62 const struct nla_policy
*nla_policy
;
67 struct ctl_table_header
*ctl_table_header
;
68 struct ctl_path
*ctl_table_path
;
69 struct ctl_table
*ctl_table
;
70 #endif /* CONFIG_SYSCTL */
72 /* Module (if any) which this is connected to. */
76 extern struct nf_conntrack_l3proto
*nf_ct_l3protos
[AF_MAX
];
78 /* Protocol registration. */
79 extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto
*proto
);
80 extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto
*proto
);
81 extern struct nf_conntrack_l3proto
*nf_ct_l3proto_find_get(u_int16_t l3proto
);
82 extern void nf_ct_l3proto_put(struct nf_conntrack_l3proto
*p
);
84 /* Existing built-in protocols */
85 extern struct nf_conntrack_l3proto nf_conntrack_l3proto_generic
;
87 static inline struct nf_conntrack_l3proto
*
88 __nf_ct_l3proto_find(u_int16_t l3proto
)
90 if (unlikely(l3proto
>= AF_MAX
))
91 return &nf_conntrack_l3proto_generic
;
92 return rcu_dereference(nf_ct_l3protos
[l3proto
]);
95 #endif /*_NF_CONNTRACK_L3PROTO_H*/