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

#ifndef _NF_CONNTRACK_TCP_H
#define _NF_CONNTRACK_TCP_H
/* TCP tracking. */

#include <linux/types.h>

/* This is exposed to userspace (ctnetlink) */
enum tcp_conntrack {
	TCP_CONNTRACK_NONE,
	TCP_CONNTRACK_SYN_SENT,
	TCP_CONNTRACK_SYN_RECV,
	TCP_CONNTRACK_ESTABLISHED,
	TCP_CONNTRACK_FIN_WAIT,
	TCP_CONNTRACK_CLOSE_WAIT,
	TCP_CONNTRACK_LAST_ACK,
	TCP_CONNTRACK_TIME_WAIT,
	TCP_CONNTRACK_CLOSE,
	TCP_CONNTRACK_LISTEN,	/* obsolete */
#define TCP_CONNTRACK_SYN_SENT2	TCP_CONNTRACK_LISTEN
	TCP_CONNTRACK_MAX,
	TCP_CONNTRACK_IGNORE
};

/* Window scaling is advertised by the sender */
#define IP_CT_TCP_FLAG_WINDOW_SCALE		0x01

/* SACK is permitted by the sender */
#define IP_CT_TCP_FLAG_SACK_PERM		0x02

/* This sender sent FIN first */
#define IP_CT_TCP_FLAG_CLOSE_INIT		0x04

/* Be liberal in window checking */
#define IP_CT_TCP_FLAG_BE_LIBERAL		0x08

/* Has unacknowledged data */
#define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED	0x10

/* The field td_maxack has been set */
#define IP_CT_TCP_FLAG_MAXACK_SET		0x20

struct nf_ct_tcp_flags {
	__u8 flags;
	__u8 mask;
};

#ifdef __KERNEL__

struct ip_ct_tcp_state {
	u_int32_t	td_end;		/* max of seq + len */
	u_int32_t	td_maxend;	/* max of ack + max(win, 1) */
	u_int32_t	td_maxwin;	/* max(win) */
	u_int32_t	td_maxack;	/* max of ack */
	u_int8_t	td_scale;	/* window scale factor */
	u_int8_t	flags;		/* per direction options */
};

struct ip_ct_tcp {
	struct ip_ct_tcp_state seen[2];	/* connection parameters per direction */
	u_int8_t	state;		/* state of the connection (enum tcp_conntrack) */
	/* For detecting stale connections */
	u_int8_t	last_dir;	/* Direction of the last packet (enum ip_conntrack_dir) */
	u_int8_t	retrans;	/* Number of retransmitted packets */
	u_int8_t	last_index;	/* Index of the last packet */
	u_int32_t	last_seq;	/* Last sequence number seen in dir */
	u_int32_t	last_ack;	/* Last sequence number seen in opposite dir */
	u_int32_t	last_end;	/* Last seq + len */
	u_int16_t	last_win;	/* Last window advertisement seen in dir */
};

#endif /* __KERNEL__ */

#endif /* _NF_CONNTRACK_TCP_H */
Commit	Line	Data
9fb9cbb1 YK	1	#ifndef _NF_CONNTRACK_TCP_H
	2	#define _NF_CONNTRACK_TCP_H
	3	/* TCP tracking. */
	4
60c195c7 AB	5	#include <linux/types.h>
60c195c7 AB	6
9fb9cbb1 YK	7	/* This is exposed to userspace (ctnetlink) */
	8	enum tcp_conntrack {
	9	TCP_CONNTRACK_NONE,
	10	TCP_CONNTRACK_SYN_SENT,
	11	TCP_CONNTRACK_SYN_RECV,
	12	TCP_CONNTRACK_ESTABLISHED,
	13	TCP_CONNTRACK_FIN_WAIT,
	14	TCP_CONNTRACK_CLOSE_WAIT,
	15	TCP_CONNTRACK_LAST_ACK,
	16	TCP_CONNTRACK_TIME_WAIT,
	17	TCP_CONNTRACK_CLOSE,
874ab923 JK	18	TCP_CONNTRACK_LISTEN, /* obsolete */
874ab923 JK	19	#define TCP_CONNTRACK_SYN_SENT2 TCP_CONNTRACK_LISTEN
9fb9cbb1 YK	20	TCP_CONNTRACK_MAX,
	21	TCP_CONNTRACK_IGNORE
	22	};
	23
	24	/* Window scaling is advertised by the sender */
	25	#define IP_CT_TCP_FLAG_WINDOW_SCALE 0x01
	26
	27	/* SACK is permitted by the sender */
	28	#define IP_CT_TCP_FLAG_SACK_PERM 0x02
	29
	30	/* This sender sent FIN first */
f79e7802	31	#define IP_CT_TCP_FLAG_CLOSE_INIT 0x04
9fb9cbb1	32
a09113c2 PM	33	/* Be liberal in window checking */
	34	#define IP_CT_TCP_FLAG_BE_LIBERAL 0x08
	35
ae375044 PM	36	/* Has unacknowledged data */
	37	#define IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED 0x10
	38
bfcaa502 JK	39	/* The field td_maxack has been set */
	40	#define IP_CT_TCP_FLAG_MAXACK_SET 0x20
	41
c8e2078c	42	struct nf_ct_tcp_flags {
60c195c7 AB	43	__u8 flags;
60c195c7 AB	44	__u8 mask;
c8e2078c PNA	45	};
c8e2078c PNA	46
9fb9cbb1 YK	47	#ifdef __KERNEL__
	48
	49	struct ip_ct_tcp_state {
	50	u_int32_t td_end; /* max of seq + len */
	51	u_int32_t td_maxend; /* max of ack + max(win, 1) */
	52	u_int32_t td_maxwin; /* max(win) */
bfcaa502	53	u_int32_t td_maxack; /* max of ack */
9fb9cbb1	54	u_int8_t td_scale; /* window scale factor */
9fb9cbb1 YK	55	u_int8_t flags; /* per direction options */
	56	};
	57
d94d9fee	58	struct ip_ct_tcp {
9fb9cbb1 YK	59	struct ip_ct_tcp_state seen[2]; /* connection parameters per direction */
	60	u_int8_t state; /* state of the connection (enum tcp_conntrack) */
	61	/* For detecting stale connections */
	62	u_int8_t last_dir; /* Direction of the last packet (enum ip_conntrack_dir) */
	63	u_int8_t retrans; /* Number of retransmitted packets */
	64	u_int8_t last_index; /* Index of the last packet */
	65	u_int32_t last_seq; /* Last sequence number seen in dir */
	66	u_int32_t last_ack; /* Last sequence number seen in opposite dir */
	67	u_int32_t last_end; /* Last seq + len */
c1fe3ca5	68	u_int16_t last_win; /* Last window advertisement seen in dir */
9fb9cbb1 YK	69	};
	70
	71	#endif /* __KERNEL__ */
	72
	73	#endif /* _NF_CONNTRACK_TCP_H */