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 <net/netfilter/nf_conntrack.h>
17 struct nf_conntrack_l4proto
19 /* L3 Protocol number. */
22 /* L4 Protocol number. */
28 /* Try to fill in the third arg: dataoff is offset past network protocol
29 hdr. Return true if possible. */
30 int (*pkt_to_tuple)(const struct sk_buff *skb,
32 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 int (*invert_tuple)(struct nf_conntrack_tuple *inverse,
38 const struct nf_conntrack_tuple *orig);
40 /* Print out the per-protocol part of the tuple. Return like seq_* */
41 int (*print_tuple)(struct seq_file *s,
42 const struct nf_conntrack_tuple *);
44 /* Print out the private part of the conntrack. */
45 int (*print_conntrack)(struct seq_file *s, const struct nf_conn *);
47 /* Returns verdict for packet, or -1 for invalid. */
48 int (*packet)(struct nf_conn *conntrack,
49 const struct sk_buff *skb,
51 enum ip_conntrack_info ctinfo,
53 unsigned int hooknum);
55 /* Called when a new connection for this protocol found;
56 * returns TRUE if it's OK. If so, packet() called next. */
57 int (*new)(struct nf_conn *conntrack, const struct sk_buff *skb,
58 unsigned int dataoff);
60 /* Called when a conntrack entry is destroyed */
61 void (*destroy)(struct nf_conn *conntrack);
63 int (*error)(struct sk_buff *skb, unsigned int dataoff,
64 enum ip_conntrack_info *ctinfo,
65 int pf, unsigned int hooknum);
67 /* convert protoinfo to nfnetink attributes */
68 int (*to_nfattr)(struct sk_buff *skb, struct nfattr *nfa,
69 const struct nf_conn *ct);
71 /* convert nfnetlink attributes to protoinfo */
72 int (*from_nfattr)(struct nfattr *tb[], struct nf_conn *ct);
74 int (*tuple_to_nfattr)(struct sk_buff *skb,
75 const struct nf_conntrack_tuple *t);
76 int (*nfattr_to_tuple)(struct nfattr *tb[],
77 struct nf_conntrack_tuple *t);
79 /* Module (if any) which this is connected to. */
83 /* Existing built-in protocols */
84 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6;
85 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4;
86 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6;
87 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
89 #define MAX_NF_CT_PROTO 256
90 extern struct nf_conntrack_l4proto **nf_ct_protos[PF_MAX];
92 extern struct nf_conntrack_l4proto *
93 __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto);
95 extern struct nf_conntrack_l4proto *
96 nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t protocol);
98 extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p);
100 /* Protocol registration. */
101 extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto);
102 extern int nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);
104 /* Generic netlink helpers */
105 extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb,
106 const struct nf_conntrack_tuple *tuple);
107 extern int nf_ct_port_nfattr_to_tuple(struct nfattr *tb[],
108 struct nf_conntrack_tuple *t);
110 /* Log invalid packets */
111 extern unsigned int nf_ct_log_invalid;
114 #ifdef DEBUG_INVALID_PACKETS
115 #define LOG_INVALID(proto) \
116 (nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW)
118 #define LOG_INVALID(proto) \
119 ((nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) \
123 #define LOG_INVALID(proto) 0
124 #endif /* CONFIG_SYSCTL */
126 #endif /*_NF_CONNTRACK_PROTOCOL_H*/