[net-next-2.6.git] / include / net / netfilter / nf_conntrack_l4proto.h

/*
 * Header for use in defining a given L4 protocol for connection tracking.
 *
 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
 *	- generalized L3 protocol dependent part.
 *
 * Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
 */

#ifndef _NF_CONNTRACK_L4PROTO_H
#define _NF_CONNTRACK_L4PROTO_H
#include <linux/netlink.h>
#include <net/netfilter/nf_conntrack.h>

struct seq_file;

struct nf_conntrack_l4proto
{
	/* L3 Protocol number. */
	u_int16_t l3proto;

	/* L4 Protocol number. */
	u_int8_t l4proto;

	/* Protocol name */
	const char *name;

	/* Try to fill in the third arg: dataoff is offset past network protocol
           hdr.  Return true if possible. */
	int (*pkt_to_tuple)(const struct sk_buff *skb,
			    unsigned int dataoff,
			    struct nf_conntrack_tuple *tuple);

	/* Invert the per-proto part of the tuple: ie. turn xmit into reply.
	 * Some packets can't be inverted: return 0 in that case.
	 */
	int (*invert_tuple)(struct nf_conntrack_tuple *inverse,
			    const struct nf_conntrack_tuple *orig);

	/* Print out the per-protocol part of the tuple. Return like seq_* */
	int (*print_tuple)(struct seq_file *s,
			   const struct nf_conntrack_tuple *);

	/* Print out the private part of the conntrack. */
	int (*print_conntrack)(struct seq_file *s, const struct nf_conn *);

	/* Returns verdict for packet, or -1 for invalid. */
	int (*packet)(struct nf_conn *conntrack,
		      const struct sk_buff *skb,
		      unsigned int dataoff,
		      enum ip_conntrack_info ctinfo,
		      int pf,
		      unsigned int hooknum);

	/* Called when a new connection for this protocol found;
	 * returns TRUE if it's OK.  If so, packet() called next. */
	int (*new)(struct nf_conn *conntrack, const struct sk_buff *skb,
		   unsigned int dataoff);

	/* Called when a conntrack entry is destroyed */
	void (*destroy)(struct nf_conn *conntrack);

	int (*error)(struct sk_buff *skb, unsigned int dataoff,
		     enum ip_conntrack_info *ctinfo,
		     int pf, unsigned int hooknum);

	/* convert protoinfo to nfnetink attributes */
	int (*to_nfattr)(struct sk_buff *skb, struct nlattr *nla,
			 const struct nf_conn *ct);

	/* convert nfnetlink attributes to protoinfo */
	int (*from_nfattr)(struct nlattr *tb[], struct nf_conn *ct);

	int (*tuple_to_nfattr)(struct sk_buff *skb,
			       const struct nf_conntrack_tuple *t);
	int (*nfattr_to_tuple)(struct nlattr *tb[],
			       struct nf_conntrack_tuple *t);

#ifdef CONFIG_SYSCTL
	struct ctl_table_header	**ctl_table_header;
	struct ctl_table	*ctl_table;
	unsigned int		*ctl_table_users;
#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	struct ctl_table_header	*ctl_compat_table_header;
	struct ctl_table	*ctl_compat_table;
#endif
#endif

	/* Module (if any) which this is connected to. */
	struct module *me;
};

/* Existing built-in protocols */
extern struct nf_conntrack_l4proto nf_conntrack_l4proto_tcp6;
extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4;
extern struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6;
extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;

#define MAX_NF_CT_PROTO 256

extern struct nf_conntrack_l4proto *
__nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto);

extern struct nf_conntrack_l4proto *
nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t protocol);

extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p);

/* Protocol registration. */
extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto);
extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);

/* Generic netlink helpers */
extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb,
				      const struct nf_conntrack_tuple *tuple);
extern int nf_ct_port_nfattr_to_tuple(struct nlattr *tb[],
				      struct nf_conntrack_tuple *t);

/* Log invalid packets */
extern unsigned int nf_ct_log_invalid;

#ifdef CONFIG_SYSCTL
#ifdef DEBUG_INVALID_PACKETS
#define LOG_INVALID(proto) \
	(nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW)
#else
#define LOG_INVALID(proto) \
	((nf_ct_log_invalid == (proto) || nf_ct_log_invalid == IPPROTO_RAW) \
	 && net_ratelimit())
#endif
#else
#define LOG_INVALID(proto) 0
#endif /* CONFIG_SYSCTL */

#endif /*_NF_CONNTRACK_PROTOCOL_H*/
Commit	Line	Data
9fb9cbb1	1	/*
605dcad6	2	* Header for use in defining a given L4 protocol for connection tracking.
9fb9cbb1 YK	3	*
	4	* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
	5	* - generalized L3 protocol dependent part.
	6	*
	7	* Derived from include/linux/netfiter_ipv4/ip_conntrack_protcol.h
	8	*/
	9
605dcad6 MJ	10	#ifndef _NF_CONNTRACK_L4PROTO_H
605dcad6 MJ	11	#define _NF_CONNTRACK_L4PROTO_H
df6fb868	12	#include <linux/netlink.h>
9fb9cbb1 YK	13	#include <net/netfilter/nf_conntrack.h>
	14
	15	struct seq_file;
	16
605dcad6	17	struct nf_conntrack_l4proto
9fb9cbb1	18	{
9fb9cbb1 YK	19	/* L3 Protocol number. */
	20	u_int16_t l3proto;
	21
605dcad6 MJ	22	/* L4 Protocol number. */
605dcad6 MJ	23	u_int8_t l4proto;
9fb9cbb1 YK	24
	25	/* Protocol name */
	26	const char *name;
	27
	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,
	31	unsigned int dataoff,
	32	struct nf_conntrack_tuple *tuple);
	33
	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.
	36	*/
	37	int (invert_tuple)(struct nf_conntrack_tuple inverse,
	38	const struct nf_conntrack_tuple *orig);
	39
	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 *);
	43
	44	/* Print out the private part of the conntrack. */
	45	int (print_conntrack)(struct seq_file s, const struct nf_conn *);
	46
	47	/* Returns verdict for packet, or -1 for invalid. */
	48	int (packet)(struct nf_conn conntrack,
	49	const struct sk_buff *skb,
	50	unsigned int dataoff,
	51	enum ip_conntrack_info ctinfo,
	52	int pf,
	53	unsigned int hooknum);
	54
	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);
	59
	60	/* Called when a conntrack entry is destroyed */
	61	void (destroy)(struct nf_conn conntrack);
	62
	63	int (error)(struct sk_buff skb, unsigned int dataoff,
	64	enum ip_conntrack_info *ctinfo,
	65	int pf, unsigned int hooknum);
	66
c1d10adb	67	/* convert protoinfo to nfnetink attributes */
df6fb868	68	int (to_nfattr)(struct sk_buff skb, struct nlattr *nla,
c1d10adb PNA	69	const struct nf_conn *ct);
	70
	71	/* convert nfnetlink attributes to protoinfo */
df6fb868	72	int (from_nfattr)(struct nlattr tb[], struct nf_conn *ct);
c1d10adb PNA	73
	74	int (tuple_to_nfattr)(struct sk_buff skb,
	75	const struct nf_conntrack_tuple *t);
df6fb868	76	int (nfattr_to_tuple)(struct nlattr tb[],
c1d10adb PNA	77	struct nf_conntrack_tuple *t);
c1d10adb PNA	78
d62f9ed4 PM	79	#ifdef CONFIG_SYSCTL
	80	struct ctl_table_header **ctl_table_header;
	81	struct ctl_table *ctl_table;
	82	unsigned int *ctl_table_users;
a999e683 PM	83	#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
	84	struct ctl_table_header *ctl_compat_table_header;
	85	struct ctl_table *ctl_compat_table;
	86	#endif
	87	#endif
d62f9ed4	88
9fb9cbb1 YK	89	/* Module (if any) which this is connected to. */
	90	struct module *me;
	91	};
	92
	93	/* Existing built-in protocols */
605dcad6 MJ	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;
9fb9cbb1 YK	98
9fb9cbb1 YK	99	#define MAX_NF_CT_PROTO 256
9fb9cbb1	100
605dcad6 MJ	101	extern struct nf_conntrack_l4proto *
605dcad6 MJ	102	__nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto);
c1d10adb	103
605dcad6 MJ	104	extern struct nf_conntrack_l4proto *
605dcad6 MJ	105	nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t protocol);
c1d10adb	106
605dcad6	107	extern void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p);
9fb9cbb1 YK	108
9fb9cbb1 YK	109	/* Protocol registration. */
605dcad6	110	extern int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *proto);
fe3eb20c	111	extern void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *proto);
9fb9cbb1	112
c1d10adb PNA	113	/* Generic netlink helpers */
	114	extern int nf_ct_port_tuple_to_nfattr(struct sk_buff *skb,
	115	const struct nf_conntrack_tuple *tuple);
df6fb868	116	extern int nf_ct_port_nfattr_to_tuple(struct nlattr *tb[],
c1d10adb PNA	117	struct nf_conntrack_tuple *t);
c1d10adb PNA	118
9fb9cbb1 YK	119	/* Log invalid packets */
	120	extern unsigned int nf_ct_log_invalid;
	121
	122	#ifdef CONFIG_SYSCTL
	123	#ifdef DEBUG_INVALID_PACKETS
	124	#define LOG_INVALID(proto) \
	125	(nf_ct_log_invalid == (proto) \|\| nf_ct_log_invalid == IPPROTO_RAW)
	126	#else
	127	#define LOG_INVALID(proto) \
	128	((nf_ct_log_invalid == (proto) \|\| nf_ct_log_invalid == IPPROTO_RAW) \
	129	&& net_ratelimit())
	130	#endif
	131	#else
	132	#define LOG_INVALID(proto) 0
	133	#endif /* CONFIG_SYSCTL */
	134
	135	#endif /_NF_CONNTRACK_PROTOCOL_H/