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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _NF_CONNTRACK_COMMON_H
#define _NF_CONNTRACK_COMMON_H
#ifdef __cplusplus
extern "C" {
#endif
/* 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,
IP_CT_ESTABLISHED_REPLY = IP_CT_ESTABLISHED + IP_CT_IS_REPLY,
IP_CT_RELATED_REPLY = IP_CT_RELATED + IP_CT_IS_REPLY,
/* No NEW in reply direction. */
/* Number of distinct IP_CT types. */
IP_CT_NUMBER,
/* only for userspace compatibility */
#ifndef __KERNEL__
IP_CT_NEW_REPLY = IP_CT_NUMBER,
#else
IP_CT_UNTRACKED = 7,
#endif
};
#define NF_CT_STATE_INVALID_BIT (1 << 0)
#define NF_CT_STATE_BIT(ctinfo) (1 << ((ctinfo) % IP_CT_IS_REPLY + 1))
#define NF_CT_STATE_UNTRACKED_BIT (1 << 6)
/* 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),
/* Conntrack is a template */
IPS_TEMPLATE_BIT = 11,
IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
/* Conntrack is a fake untracked entry. Obsolete and not used anymore */
IPS_UNTRACKED_BIT = 12,
IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
/* Conntrack got a helper explicitly attached via CT target. */
IPS_HELPER_BIT = 13,
IPS_HELPER = (1 << IPS_HELPER_BIT),
/* Conntrack has been offloaded to flow table. */
IPS_OFFLOAD_BIT = 14,
IPS_OFFLOAD = (1 << IPS_OFFLOAD_BIT),
/* Be careful here, modifying these bits can make things messy,
* so don't let users modify them directly.
*/
IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK |
IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING |
IPS_SEQ_ADJUST | IPS_TEMPLATE | IPS_OFFLOAD),
__IPS_MAX_BIT = 15,
};
/* Connection tracking event types */
enum ip_conntrack_events {
IPCT_NEW, /* new conntrack */
IPCT_RELATED, /* related conntrack */
IPCT_DESTROY, /* destroyed conntrack */
IPCT_REPLY, /* connection has seen two-way traffic */
IPCT_ASSURED, /* connection status has changed to assured */
IPCT_PROTOINFO, /* protocol information has changed */
IPCT_HELPER, /* new helper has been set */
IPCT_MARK, /* new mark has been set */
IPCT_SEQADJ, /* sequence adjustment has changed */
IPCT_NATSEQADJ = IPCT_SEQADJ,
IPCT_SECMARK, /* new security mark has been set */
IPCT_LABEL, /* new connlabel has been set */
IPCT_SYNPROXY, /* synproxy has been set */
#ifdef __KERNEL__
__IPCT_MAX
#endif
};
enum ip_conntrack_expect_events {
IPEXP_NEW, /* new expectation */
IPEXP_DESTROY, /* destroyed expectation */
};
/* expectation flags */
#define NF_CT_EXPECT_PERMANENT 0x1
#define NF_CT_EXPECT_INACTIVE 0x2
#define NF_CT_EXPECT_USERSPACE 0x4
#ifdef __cplusplus
}
#endif
#endif /* _NF_CONNTRACK_COMMON_H */
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