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linux
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netfilter
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Filename :
nf_conntrack_common.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ #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, 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 */ IP_CT_NEW_REPLY = IP_CT_NUMBER, }; #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 (ruleset, ctnetlink). */ 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), /* Conntrack has been offloaded to hardware. */ IPS_HW_OFFLOAD_BIT = 15, IPS_HW_OFFLOAD = (1 << IPS_HW_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_UNTRACKED | IPS_OFFLOAD | IPS_HW_OFFLOAD), __IPS_MAX_BIT = 16, }; /* 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 */ }; 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 #endif /* _NF_CONNTRACK_COMMON_H */