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
20 /* L3 Protocol number. */
23 /* L4 Protocol number. */
26 /* Try to fill in the third arg: dataoff is offset past network protocol
27 hdr. Return true if possible. */
28 bool (*pkt_to_tuple)(const struct sk_buff *skb, unsigned int dataoff,
29 struct nf_conntrack_tuple *tuple);
31 /* Invert the per-proto part of the tuple: ie. turn xmit into reply.
32 * Some packets can't be inverted: return 0 in that case.
34 bool (*invert_tuple)(struct nf_conntrack_tuple *inverse,
35 const struct nf_conntrack_tuple *orig);
37 /* Returns verdict for packet, or -1 for invalid. */
38 int (*packet)(struct nf_conn *ct,
39 const struct sk_buff *skb,
41 enum ip_conntrack_info ctinfo,
43 unsigned int hooknum);
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);
50 /* Called when a conntrack entry is destroyed */
51 void (*destroy)(struct nf_conn *ct);
53 int (*error)(struct net *net, struct sk_buff *skb, unsigned int dataoff,
54 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, const struct nf_conn *);
64 /* convert protoinfo to nfnetink attributes */
65 int (*to_nlattr)(struct sk_buff *skb, struct nlattr *nla,
66 const struct nf_conn *ct);
68 /* convert nfnetlink attributes to protoinfo */
69 int (*from_nlattr)(struct nlattr *tb[], struct nf_conn *ct);
71 int (*tuple_to_nlattr)(struct sk_buff *skb,
72 const struct nf_conntrack_tuple *t);
73 int (*nlattr_to_tuple)(struct nlattr *tb[],
74 struct nf_conntrack_tuple *t);
75 const struct nla_policy *nla_policy;
78 struct ctl_table_header **ctl_table_header;
79 struct ctl_table *ctl_table;
80 unsigned int *ctl_table_users;
81 #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
82 struct ctl_table_header *ctl_compat_table_header;
83 struct ctl_table *ctl_compat_table;
89 /* Module (if any) which this is connected to. */
93 /* Existing built-in protocols */
94 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6;
95 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4;
96 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6;
97 extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
99 #define MAX_NF_CT_PROTO 256
101 extern struct nf_conntrack_l4proto *
102 __nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto);
104 extern struct nf_conntrack_l4proto *
105 nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t protocol);
107 extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p);
109 /* Protocol registration. */
110 extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto);
111 extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);
113 /* Generic netlink helpers */
114 extern int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb,
115 const struct nf_conntrack_tuple *tuple);
116 extern int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[],
117 struct nf_conntrack_tuple *t);
118 extern const struct nla_policy nf_ct_port_nla_policy[];
120 /* Log invalid packets */
121 extern unsigned int nf_ct_log_invalid;
124 #ifdef DEBUG_INVALID_PACKETS
125 #define LOG_INVALID(proto) \
126 (nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW)
128 #define LOG_INVALID(proto) \
129 ((nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) \
133 #define LOG_INVALID(proto) 0
134 #endif /* CONFIG_SYSCTL */
136 #endif /*_NF_CONNTRACK_PROTOCOL_H*/