nf_conntrack_common.h
#ifndef _NF_CONNTRACK_COMMON_H
#define _NF_CONNTRACK_COMMON_H
/* Connection state tracking for netfilter. This is separated from,
but required by, the NAT layer; it can also be used by an iptables
extension. */
enum ip_conntrack_info
{
/* Part of an established connection (either direction). */
IP_CT_ESTABLISHED,
/* Like NEW, but related to an existing connection, or ICMP error
(in either direction). */
IP_CT_RELATED,
/* Started a new connection to track (only
IP_CT_DIR_ORIGINAL); may be a retransmission. */
IP_CT_NEW,
/* >= this indicates reply direction */
IP_CT_IS_REPLY,
/* Number of distinct IP_CT types (no NEW in reply dirn). */
IP_CT_NUMBER = IP_CT_IS_REPLY * 2 - 1
};
/* Bitset representing status of connection. */
enum ip_conntrack_status {
/* It's an expected connection: bit 0 set. This bit never changed */
IPS_EXPECTED_BIT = 0,
IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
/* We've seen packets both ways: bit 1 set. Can be set, not unset. */
IPS_SEEN_REPLY_BIT = 1,
IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
/* Conntrack should never be early-expired. */
IPS_ASSURED_BIT = 2,
IPS_ASSURED = (1 << IPS_ASSURED_BIT),
/* Connection is confirmed: originating packet has left box */
IPS_CONFIRMED_BIT = 3,
IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
/* Connection needs src nat in orig dir. This bit never changed. */
IPS_SRC_NAT_BIT = 4,
IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
/* Connection needs dst nat in orig dir. This bit never changed. */
IPS_DST_NAT_BIT = 5,
IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
/* Both together. */
IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
/* Connection needs TCP sequence adjusted. */
IPS_SEQ_ADJUST_BIT = 6,
IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
/* NAT initialization bits. */
IPS_SRC_NAT_DONE_BIT = 7,
IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
IPS_DST_NAT_DONE_BIT = 8,
IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
/* Both together */
IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
/* Connection is dying (removed from lists), can not be unset. */
IPS_DYING_BIT = 9,
IPS_DYING = (1 << IPS_DYING_BIT),
/* Connection has fixed timeout. */
IPS_FIXED_TIMEOUT_BIT = 10,
IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
};
/* Connection tracking event bits */
enum ip_conntrack_events
{
/* New conntrack */
IPCT_NEW_BIT = 0,
IPCT_NEW = (1 << IPCT_NEW_BIT),
/* Expected connection */
IPCT_RELATED_BIT = 1,
IPCT_RELATED = (1 << IPCT_RELATED_BIT),
/* Destroyed conntrack */
IPCT_DESTROY_BIT = 2,
IPCT_DESTROY = (1 << IPCT_DESTROY_BIT),
/* Timer has been refreshed */
IPCT_REFRESH_BIT = 3,
IPCT_REFRESH = (1 << IPCT_REFRESH_BIT),
/* Status has changed */
IPCT_STATUS_BIT = 4,
IPCT_STATUS = (1 << IPCT_STATUS_BIT),
/* Update of protocol info */
IPCT_PROTOINFO_BIT = 5,
IPCT_PROTOINFO = (1 << IPCT_PROTOINFO_BIT),
/* Volatile protocol info */
IPCT_PROTOINFO_VOLATILE_BIT = 6,
IPCT_PROTOINFO_VOLATILE = (1 << IPCT_PROTOINFO_VOLATILE_BIT),
/* New helper for conntrack */
IPCT_HELPER_BIT = 7,
IPCT_HELPER = (1 << IPCT_HELPER_BIT),
/* Update of helper info */
IPCT_HELPINFO_BIT = 8,
IPCT_HELPINFO = (1 << IPCT_HELPINFO_BIT),
/* Volatile helper info */
IPCT_HELPINFO_VOLATILE_BIT = 9,
IPCT_HELPINFO_VOLATILE = (1 << IPCT_HELPINFO_VOLATILE_BIT),
/* NAT info */
IPCT_NATINFO_BIT = 10,
IPCT_NATINFO = (1 << IPCT_NATINFO_BIT),
/* Counter highest bit has been set, unused */
IPCT_COUNTER_FILLING_BIT = 11,
IPCT_COUNTER_FILLING = (1 << IPCT_COUNTER_FILLING_BIT),
/* Mark is set */
IPCT_MARK_BIT = 12,
IPCT_MARK = (1 << IPCT_MARK_BIT),
/* NAT sequence adjustment */
IPCT_NATSEQADJ_BIT = 13,
IPCT_NATSEQADJ = (1 << IPCT_NATSEQADJ_BIT),
/* Secmark is set */
IPCT_SECMARK_BIT = 14,
IPCT_SECMARK = (1 << IPCT_SECMARK_BIT),
};
enum ip_conntrack_expect_events {
IPEXP_NEW_BIT = 0,
IPEXP_NEW = (1 << IPEXP_NEW_BIT),
};
#ifdef __KERNEL__
struct ip_conntrack_stat
{
unsigned int searched;
unsigned int found;
unsigned int new;
unsigned int invalid;
unsigned int ignore;
unsigned int delete;
unsigned int delete_list;
unsigned int insert;
unsigned int insert_failed;
unsigned int drop;
unsigned int early_drop;
unsigned int error;
unsigned int expect_new;
unsigned int expect_create;
unsigned int expect_delete;
};
/* call to create an explicit dependency on nf_conntrack. */
extern void need_conntrack(void);
#endif /* __KERNEL__ */
#endif /* _NF_CONNTRACK_COMMON_H */