/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_NF_CONNTRACK_COMMON_H
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#define _UAPI_NF_CONNTRACK_COMMON_H
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/* Connection state tracking for netfilter. This is separated from,
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but required by, the NAT layer; it can also be used by an iptables
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extension. */
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enum ip_conntrack_info {
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/* Part of an established connection (either direction). */
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IP_CT_ESTABLISHED,
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/* Like NEW, but related to an existing connection, or ICMP error
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(in either direction). */
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IP_CT_RELATED,
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/* Started a new connection to track (only
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IP_CT_DIR_ORIGINAL); may be a retransmission. */
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IP_CT_NEW,
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/* >= this indicates reply direction */
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IP_CT_IS_REPLY,
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IP_CT_ESTABLISHED_REPLY = IP_CT_ESTABLISHED + IP_CT_IS_REPLY,
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IP_CT_RELATED_REPLY = IP_CT_RELATED + IP_CT_IS_REPLY,
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/* No NEW in reply direction. */
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/* Number of distinct IP_CT types. */
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IP_CT_NUMBER,
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/* only for userspace compatibility */
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#ifndef __KERNEL__
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IP_CT_NEW_REPLY = IP_CT_NUMBER,
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#else
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IP_CT_UNTRACKED = 7,
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#endif
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};
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#define NF_CT_STATE_INVALID_BIT (1 << 0)
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#define NF_CT_STATE_BIT(ctinfo) (1 << ((ctinfo) % IP_CT_IS_REPLY + 1))
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#define NF_CT_STATE_UNTRACKED_BIT (1 << 6)
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/* Bitset representing status of connection. */
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enum ip_conntrack_status {
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/* It's an expected connection: bit 0 set. This bit never changed */
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IPS_EXPECTED_BIT = 0,
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IPS_EXPECTED = (1 << IPS_EXPECTED_BIT),
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/* We've seen packets both ways: bit 1 set. Can be set, not unset. */
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IPS_SEEN_REPLY_BIT = 1,
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IPS_SEEN_REPLY = (1 << IPS_SEEN_REPLY_BIT),
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/* Conntrack should never be early-expired. */
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IPS_ASSURED_BIT = 2,
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IPS_ASSURED = (1 << IPS_ASSURED_BIT),
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/* Connection is confirmed: originating packet has left box */
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IPS_CONFIRMED_BIT = 3,
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IPS_CONFIRMED = (1 << IPS_CONFIRMED_BIT),
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/* Connection needs src nat in orig dir. This bit never changed. */
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IPS_SRC_NAT_BIT = 4,
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IPS_SRC_NAT = (1 << IPS_SRC_NAT_BIT),
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/* Connection needs dst nat in orig dir. This bit never changed. */
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IPS_DST_NAT_BIT = 5,
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IPS_DST_NAT = (1 << IPS_DST_NAT_BIT),
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/* Both together. */
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IPS_NAT_MASK = (IPS_DST_NAT | IPS_SRC_NAT),
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/* Connection needs TCP sequence adjusted. */
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IPS_SEQ_ADJUST_BIT = 6,
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IPS_SEQ_ADJUST = (1 << IPS_SEQ_ADJUST_BIT),
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/* NAT initialization bits. */
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IPS_SRC_NAT_DONE_BIT = 7,
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IPS_SRC_NAT_DONE = (1 << IPS_SRC_NAT_DONE_BIT),
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IPS_DST_NAT_DONE_BIT = 8,
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IPS_DST_NAT_DONE = (1 << IPS_DST_NAT_DONE_BIT),
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/* Both together */
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IPS_NAT_DONE_MASK = (IPS_DST_NAT_DONE | IPS_SRC_NAT_DONE),
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/* Connection is dying (removed from lists), can not be unset. */
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IPS_DYING_BIT = 9,
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IPS_DYING = (1 << IPS_DYING_BIT),
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/* Connection has fixed timeout. */
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IPS_FIXED_TIMEOUT_BIT = 10,
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IPS_FIXED_TIMEOUT = (1 << IPS_FIXED_TIMEOUT_BIT),
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/* Conntrack is a template */
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IPS_TEMPLATE_BIT = 11,
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IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT),
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/* Conntrack is a fake untracked entry. Obsolete and not used anymore */
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IPS_UNTRACKED_BIT = 12,
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IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT),
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#ifdef __KERNEL__
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/* Re-purposed for in-kernel use:
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* Tags a conntrack entry that clashed with an existing entry
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* on insert.
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*/
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IPS_NAT_CLASH_BIT = IPS_UNTRACKED_BIT,
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IPS_NAT_CLASH = IPS_UNTRACKED,
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#endif
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/* Conntrack got a helper explicitly attached (ruleset, ctnetlink). */
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IPS_HELPER_BIT = 13,
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IPS_HELPER = (1 << IPS_HELPER_BIT),
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/* Conntrack has been offloaded to flow table. */
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IPS_OFFLOAD_BIT = 14,
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IPS_OFFLOAD = (1 << IPS_OFFLOAD_BIT),
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/* Conntrack has been offloaded to hardware. */
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IPS_HW_OFFLOAD_BIT = 15,
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IPS_HW_OFFLOAD = (1 << IPS_HW_OFFLOAD_BIT),
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/* Be careful here, modifying these bits can make things messy,
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* so don't let users modify them directly.
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*/
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IPS_UNCHANGEABLE_MASK = (IPS_NAT_DONE_MASK | IPS_NAT_MASK |
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IPS_EXPECTED | IPS_CONFIRMED | IPS_DYING |
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IPS_SEQ_ADJUST | IPS_TEMPLATE | IPS_UNTRACKED |
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IPS_OFFLOAD | IPS_HW_OFFLOAD),
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__IPS_MAX_BIT = 16,
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};
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/* Connection tracking event types */
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enum ip_conntrack_events {
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IPCT_NEW, /* new conntrack */
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IPCT_RELATED, /* related conntrack */
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IPCT_DESTROY, /* destroyed conntrack */
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IPCT_REPLY, /* connection has seen two-way traffic */
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IPCT_ASSURED, /* connection status has changed to assured */
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IPCT_PROTOINFO, /* protocol information has changed */
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IPCT_HELPER, /* new helper has been set */
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IPCT_MARK, /* new mark has been set */
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IPCT_SEQADJ, /* sequence adjustment has changed */
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IPCT_NATSEQADJ = IPCT_SEQADJ,
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IPCT_SECMARK, /* new security mark has been set */
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IPCT_LABEL, /* new connlabel has been set */
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IPCT_SYNPROXY, /* synproxy has been set */
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#ifdef __KERNEL__
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__IPCT_MAX
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#endif
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};
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enum ip_conntrack_expect_events {
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IPEXP_NEW, /* new expectation */
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IPEXP_DESTROY, /* destroyed expectation */
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};
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/* expectation flags */
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#define NF_CT_EXPECT_PERMANENT 0x1
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#define NF_CT_EXPECT_INACTIVE 0x2
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#define NF_CT_EXPECT_USERSPACE 0x4
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#endif /* _UAPI_NF_CONNTRACK_COMMON_H */
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