| #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), |
| |
| /* Conntrack is a template */ |
| IPS_TEMPLATE_BIT = 11, |
| IPS_TEMPLATE = (1 << IPS_TEMPLATE_BIT), |
| |
| /* Conntrack is a fake untracked entry */ |
| IPS_UNTRACKED_BIT = 12, |
| IPS_UNTRACKED = (1 << IPS_UNTRACKED_BIT), |
| }; |
| |
| /* 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_NATSEQADJ, /* NAT is doing sequence adjustment */ |
| IPCT_SECMARK, /* new security mark 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 */ |
